The present disclosure relates to a variable volume ratio compressor.
This section provides background information related to the present disclosure and is not necessarily prior art.
Compressors are used in a variety of industrial, commercial and residential applications to circulate a working fluid within a climate-control system (e.g., a refrigeration system, an air conditioning system, a heat-pump system, a chiller system, etc.) to provide a desired cooling and/or heating effect. A typical climate-control system may include a fluid circuit having an outdoor heat exchanger, an indoor heat exchanger, an expansion device disposed between the indoor and outdoor heat exchangers, and a compressor circulating a working fluid (e.g., refrigerant or carbon dioxide) between the indoor and outdoor heat exchangers. Efficient and reliable operation of the compressor is desirable to ensure that the climate-control system in which the compressor is installed is capable of effectively and efficiently providing a cooling and/or heating effect on demand.
This section provides a general summary of the disclosure, and is not a comprehensive disclosure of its full scope or all of its features.
The present disclosure provides a compressor that may include a shell assembly, a non-orbiting scroll, an orbiting scroll, and variable-volume-ratio valve assembly. The shell assembly may define a discharge chamber. The non-orbiting scroll may be disposed within the discharge chamber and may include a first end plate and a first spiral wrap extending from the first end plate. The orbiting scroll may be disposed within the discharge chamber and may include a second end plate and a second spiral wrap extending from the second end plate. The first and second spiral wraps mesh with each other to define a plurality of fluid pockets therebetween. The fluid pockets are movable among a radially outermost position, a radially intermediate position, and a radially innermost position. The second end plate may include a variable-volume-ratio port extending therethrough and selectively communicating with one of the fluid pockets at the radially intermediate position. The variable-volume-ratio valve assembly may be mounted to the orbiting scroll and may include a valve member that is movable relative to the orbiting scroll between an open position allowing communication between the variable-volume-ratio port and the discharge chamber and a closed position restricting communication between the variable-volume-ratio port and the discharge chamber.
In some configurations of the compressor of the above paragraph, when the valve member is in the open position, fluid flows from the variable-volume-ratio port to the discharge chamber without flowing back into any of the fluid pockets.
In some configurations of the compressor of either of the above paragraphs, the first end plate of the non-orbiting scroll includes a discharge passage in communication with the discharge chamber and one of the fluid pockets at the radially innermost position. The variable-volume-ratio port is disposed radially outward relative to the discharge passage.
In some configurations of the compressor of any one or more of the above paragraphs, when the valve member is in the open position, fluid flows from the variable-volume-ratio port to the discharge chamber without flowing through the discharge passage in the non-orbiting scroll.
In some configurations of the compressor of any one or more of the above paragraphs, the second end plate includes an annular hub extending from a side of the second end plate opposite the second spiral wrap. The annular hub may define a cavity in which the variable-volume-ratio valve assembly is at least partially disposed.
In some configurations of the compressor of any one or more of the above paragraphs, the compressor includes a driveshaft engaging the annular hub and driving the orbiting scroll.
In some configurations of the compressor of any one or more of the above paragraphs, the driveshaft includes a crank pin disposed within the cavity.
In some configurations of the compressor of any one or more of the above paragraphs, the compressor includes a bearing disposed within the cavity and receiving the crank pin. The bearing may at least partially define a flow path extending from the variable-volume-ratio port to the discharge chamber.
In some configurations of the compressor of any one or more of the above paragraphs, the compressor includes a bearing disposed within the cavity and receiving the crank pin. The annular hub includes a flow passage extending therethrough. The flow passage may be disposed radially outward relative to the bearing and at least partially defines a flow path extending from the variable-volume-ratio port to the discharge chamber.
In some configurations of the compressor of any one or more of the above paragraphs, the annular hub is a two-piece hub including a first annular member and a second annular member. The second annular member may be at least partially received within the first annular member and may receive the bearing.
In some configurations of the compressor of any one or more of the above paragraphs, the variable-volume-ratio valve assembly includes a retainer disposed within the cavity and fixedly mounted to the second end plate.
In some configurations of the compressor of any one or more of the above paragraphs, the valve member is a reed valve that is sandwiched between the retainer and the second end plate. The reed valve may bend between the open and closed positions.
In some configurations of the compressor of any one or more of the above paragraphs, the second end plate includes another variable-volume-ratio port. The valve member may selectively open and close the variable-volume-ratio ports. The valve member may be fixedly attached to the second end plate at a location radially between the variable-volume-ratio ports.
In some configurations of the compressor of any one or more of the above paragraphs, the second end plate includes a recess disposed between and in communication with the variable-volume-ratio port and the cavity. The valve member may be disposed within the recess and may be movable therein between the open and closed positions.
In some configurations of the compressor of any one or more of the above paragraphs, the variable-volume-ratio valve assembly includes a spring disposed at least partially within the recess and between the valve member and the retainer. The spring may bias the valve member toward the closed position.
In some configurations of the compressor of any one or more of the above paragraphs, the valve member is a disc-shaped member having a flow passage formed in its periphery.
In some configurations of the compressor of any one or more of the above paragraphs, the second end plate includes an additional variable-volume-ratio port. The variable-volume-ratio valve assembly may include another spring and another valve member movably received within another recess that is in communication with the cavity and the additional variable-volume-ratio port.
In some configurations of the compressor of any one or more of the above paragraphs, the second end plate includes an annular hub extending from a side of the second end plate opposite the second spiral wrap. The annular hub may define a cavity that receives a crank pin of a driveshaft. The annular hub may be a two-piece hub including a first annular member and a second annular member. The second annular member may be partially received within the first annular member and may receive the crank pin. The variable-volume-ratio valve assembly may be mounted to the second annular member.
In some configurations of the compressor of any one or more of the above paragraphs, the variable-volume-ratio valve assembly includes a spring disposed between the second annular member and the valve member and biasing the valve member toward the closed position.
In some configurations of the compressor of any one or more of the above paragraphs, the valve member is a disc-shaped member having a flow passage formed in its periphery.
In some configurations of the compressor of any one or more of the above paragraphs, the valve member is disposed radially between the first and second annular members and extends partially around the crank pin of the driveshaft.
In some configurations of the compressor of any one or more of the above paragraphs, the variable-volume-ratio port extends through a portion of the first annular member.
In some configurations of the compressor of any one or more of the above paragraphs, the valve member contacts an inner diametrical surface of the first annular member when the valve member is in the closed position.
In some configurations of the compressor of any one or more of the above paragraphs, a portion of the valve member moves inward away from the inner diametrical surface of the first annular member when the valve member moves from the closed position to the open position.
In some configurations of the compressor of any one or more of the above paragraphs, the orbiting scroll includes a first portion and a second portion attached to the first portion by a plurality of fasteners. The first portion may include the second spiral wrap and a portion of the second end plate. The second portion may include another portion of the second end plate and an annular hub that receives a crank pin of a driveshaft.
In some configurations of the compressor of any one or more of the above paragraphs, the annular hub includes a flow passage in communication with the variable-volume-ratio port and the discharge chamber.
In some configurations of the compressor of any one or more of the above paragraphs, the variable-volume-ratio valve assembly includes a spring disposed between the valve member and the second portion of the orbiting scroll. The spring may bias the valve member toward a valve seat defined by the first portion of the orbiting scroll.
In some configurations of the compressor of any one or more of the above paragraphs, the compressor includes a driveshaft having an eccentric recess.
In some configurations of the compressor of any one or more of the above paragraphs, the second end plate includes an annular hub extending from a side of the second end plate opposite the second spiral wrap.
In some configurations of the compressor of any one or more of the above paragraphs, the annular hub defines a cavity in which the variable-volume-ratio valve assembly is at least partially disposed.
In some configurations of the compressor of any one or more of the above paragraphs, the annular hub is received within the eccentric recess of the driveshaft.
In some configurations of the compressor of any one or more of the above paragraphs, the driveshaft includes a flow passage in fluid communication with the cavity.
In some configurations of the compressor of any one or more of the above paragraphs, when the valve member is in the open position, fluid from the variable-volume-ratio port flows into the cavity.
In some configurations of the compressor of any one or more of the above paragraphs, fluid in the cavity may flow into the discharge chamber via the flow passage in the driveshaft.
In some configurations of the compressor of any one or more of the above paragraphs, the flow passage is disposed in a collar portion of the driveshaft.
In some configurations of the compressor of any one or more of the above paragraphs, the collar portion is disposed at an axial end of the driveshaft and defines the eccentric recess.
The present disclosure also provides a compressor that may include a shell assembly, a first scroll, a second scroll, and variable-volume-ratio valve assembly. The shell assembly may define a discharge chamber. The first scroll may be disposed within the discharge chamber and may include a first end plate and a first spiral wrap extending from the first end plate. The first end plate may include a discharge passage in communication with the discharge chamber. The second scroll may be disposed within the discharge chamber and may include a second end plate and a second spiral wrap extending from the second end plate. The first and second spiral wraps mesh with each other to define a plurality of moving fluid pockets therebetween. The second end plate may include a variable-volume-ratio port disposed radially outward relative to the discharge passage and selectively communicating with one of the fluid pockets. The variable-volume-ratio valve assembly may be mounted to the second scroll and may include a valve member that is movable relative to the second scroll between an open position allowing communication between the variable-volume-ratio port and the discharge chamber and a closed position restricting communication between the variable-volume-ratio port and the discharge chamber.
In some configurations of the compressor of the above paragraph, the first scroll is a non-orbiting scroll, and the second scroll is an orbiting scroll.
In some configurations of the compressor of any one or more of the above paragraphs, the second end plate includes an annular hub extending from a side of the second end plate opposite the second spiral wrap. The annular hub may define a cavity in which the variable-volume-ratio valve assembly is at least partially disposed.
In some configurations of the compressor of any one or more of the above paragraphs, the compressor includes a driveshaft engaging the annular hub and driving the orbiting scroll.
In some configurations of the compressor of any one or more of the above paragraphs, the driveshaft includes a crank pin disposed within the cavity.
In some configurations of the compressor of any one or more of the above paragraphs, the compressor includes a bearing disposed within the cavity and receiving the crank pin. The bearing may at least partially define a flow path extending from the variable-volume-ratio port to the discharge chamber.
In some configurations of the compressor of any one or more of the above paragraphs, the compressor includes a bearing disposed within the cavity and receiving the crank pin. The annular hub includes a flow passage extending therethrough. The flow passage may be disposed radially outward relative to the bearing and at least partially defines a flow path extending from the variable-volume-ratio port to the discharge chamber.
In some configurations of the compressor of any one or more of the above paragraphs, the annular hub is a two-piece hub including a first annular member and a second annular member. The second annular member may be at least partially received within the first annular member and may receive the bearing.
In some configurations of the compressor of any one or more of the above paragraphs, the variable-volume-ratio valve assembly includes a retainer disposed within the cavity and fixedly mounted to the second end plate.
In some configurations of the compressor of any one or more of the above paragraphs, the valve member is a reed valve that is sandwiched between the retainer and the second end plate. The reed valve may bend between the open and closed positions.
In some configurations of the compressor of any one or more of the above paragraphs, the second end plate includes another variable-volume-ratio port. The valve member may selectively open and close the variable-volume-ratio ports. The valve member may be fixedly attached to the second end plate at a location radially between the variable-volume-ratio ports.
In some configurations of the compressor of any one or more of the above paragraphs, the second end plate includes a recess disposed between and in communication with the variable-volume-ratio port and the cavity. The valve member may be disposed within the recess and may be movable therein between the open and closed positions.
In some configurations of the compressor of any one or more of the above paragraphs, the variable-volume-ratio valve assembly includes a spring disposed at least partially within the recess and between the valve member and the retainer. The spring may bias the valve member toward the closed position.
In some configurations of the compressor of any one or more of the above paragraphs, the valve member is a disc-shaped member having a flow passage formed in its periphery.
In some configurations of the compressor of any one or more of the above paragraphs, the second end plate includes an additional variable-volume-ratio port. The variable-volume-ratio valve assembly may include another spring and another valve member movably received within another recess that is in communication with the cavity and the additional variable-volume-ratio port.
In some configurations of the compressor of any one or more of the above paragraphs, the second end plate includes an annular hub extending from a side of the second end plate opposite the second spiral wrap. The annular hub may define a cavity that receives a crank pin of a driveshaft. The annular hub may be a two-piece hub including a first annular member and a second annular member. The second annular member may be partially received within the first annular member and may receive the crank pin. The variable-volume-ratio valve assembly may be mounted to the second annular member.
In some configurations of the compressor of any one or more of the above paragraphs, the variable-volume-ratio valve assembly includes a spring disposed between the second annular member and the valve member and biasing the valve member toward the closed position.
In some configurations of the compressor of any one or more of the above paragraphs, the valve member is a disc-shaped member having a flow passage formed in its periphery.
In some configurations of the compressor of any one or more of the above paragraphs, the valve member is disposed radially between the first and second annular members and extends partially around the crank pin of the driveshaft.
In some configurations of the compressor of any one or more of the above paragraphs, the variable-volume-ratio port extends through a portion of the first annular member.
In some configurations of the compressor of any one or more of the above paragraphs, the valve member contacts an inner diametrical surface of the first annular member when the valve member is in the closed position.
In some configurations of the compressor of any one or more of the above paragraphs, a portion of the valve member moves inward away from the inner diametrical surface of the first annular member when the valve member moves from the closed position to the open position.
In some configurations of the compressor of any one or more of the above paragraphs, the second scroll includes a first portion and a second portion attached to the first portion by a plurality of fasteners. The first portion may include the second spiral wrap and a portion of the second end plate. The second portion may include another portion of the second end plate.
In some configurations of the compressor of any one or more of the above paragraphs, the second portion includes an annular hub that receives a crank pin of a driveshaft.
In some configurations of the compressor of any one or more of the above paragraphs, the annular hub includes a flow passage in communication with the variable-volume-ratio port and the discharge chamber.
In some configurations of the compressor of any one or more of the above paragraphs, the variable-volume-ratio valve assembly includes a spring disposed between the valve member and the second portion of the second scroll. The spring may bias the valve member toward a valve seat defined by the first portion of the second scroll.
Further areas of applicability will become apparent from the description provided herein. The description and specific examples in this summary are intended for purposes of illustration only and are not intended to limit the scope of the present disclosure.
The drawings described herein are for illustrative purposes only of selected embodiments and not all possible implementations, and are not intended to limit the scope of the present disclosure.
Corresponding reference numerals indicate corresponding parts throughout the several views of the drawings.
Example embodiments will now be described more fully with reference to the accompanying drawings.
Example embodiments are provided so that this disclosure will be thorough, and will fully convey the scope to those who are skilled in the art. Numerous specific details are set forth such as examples of specific components, devices, and methods, to provide a thorough understanding of embodiments of the present disclosure. It will be apparent to those skilled in the art that specific details need not be employed, that example embodiments may be embodied in many different forms and that neither should be construed to limit the scope of the disclosure. In some example embodiments, well-known processes, well-known device structures, and well-known technologies are not described in detail.
The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting. As used herein, the singular forms “a,” “an,” and “the” may be intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms “comprises,” “comprising,” “including,” and “having,” are inclusive and therefore specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order discussed or illustrated, unless specifically identified as an order of performance. It is also to be understood that additional or alternative steps may be employed.
When an element or layer is referred to as being “on,” “engaged to,” “connected to,” or “coupled to” another element or layer, it may be directly on, engaged, connected or coupled to the other element or layer, or intervening elements or layers may be present. In contrast, when an element is referred to as being “directly on,” “directly engaged to,” “directly connected to,” or “directly coupled to” another element or layer, there may be no intervening elements or layers present. Other words used to describe the relationship between elements should be interpreted in a like fashion (e.g., “between” versus “directly between,” “adjacent” versus “directly adjacent,” etc.). As used herein, the term “and/or” includes any and all combinations of one or more of the associated listed items.
Although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms may be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as “first,” “second,” and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.
Spatially relative terms, such as “inner,” “outer,” “beneath,” “below,” “lower,” “above,” “upper,” and the like, may be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. Spatially relative terms may be intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as “below” or “beneath” other elements or features would then be oriented “above” the other elements or features. Thus, the example term “below” can encompass both an orientation of above and below. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
With reference to
The shell assembly 12 may define a high-pressure discharge chamber 24 and may include a cylindrical shell 26, an end cap 28 at an upper end thereof, and a base 30 at a lower end thereof. A discharge fitting 32 may be attached to the shell assembly 12 (e.g., at the end cap 28) and extend through a first opening in the shell assembly 12 to allow working fluid in the discharge chamber 24 to exit the compressor 10. An inlet fitting 34 may be attached to the shell assembly 12 (e.g., at the end cap 28) and extend through a second opening in the shell assembly 12. The inlet fitting 34 may extend through a portion of the discharge chamber 24 and is fluidly coupled to a suction inlet of the compression mechanism 20. In this manner, the inlet fitting 34 provides low-pressure (suction-pressure) working fluid to the compression mechanism 20 while fluidly isolating the suction-pressure working fluid therein from the high-pressure (i.e., discharge-pressure) working fluid in the discharge chamber 24.
The first and second bearing assemblies 14, 16 may be disposed entirely within the discharge chamber 24. The first bearing assembly 14 may include a first bearing housing 36 and a first bearing 38. The first bearing housing 36 may be fixed to the shell assembly 12. The first bearing housing 36 houses the first bearing 38 and axially supports the compression mechanism 20. The second bearing assembly 16 may include a second bearing housing 40 and a second bearing 42. The second bearing housing 40 is fixed to the shell assembly 12 and supports the second bearing 42.
The motor assembly 18 may be disposed entirely within the discharge chamber 24 and may include a motor stator 44, a rotor 46, and a driveshaft 48. The stator 44 may be fixedly attached (e.g., by press fit) to the shell 26. The rotor 46 may be press fit on the driveshaft 48 and may transmit rotational power to the driveshaft 48. The driveshaft 48 may include a main body 50 and an eccentric crank pin 52 extending from an end of the main body 50. The main body 50 is received in the first and second bearings 38, 42 and is rotatably supported by the first and second bearing assemblies 14, 16. Therefore, the first and second bearings 38, 42 define a rotational axis of the driveshaft 48. The crank pin 52 may engage the compression mechanism 20.
The compression mechanism 20 may be disposed entirely within the discharge chamber 24 and may include an orbiting scroll 54 and a non-orbiting scroll 56. The orbiting scroll 54 may include an end plate 58 having a spiral wrap 60 extending therefrom. An annular hub 62 may project downwardly from the end plate 58 and may include a cavity 63 in which a drive bearing 64, a drive bushing 66 and the crank pin 52 may be disposed. The drive bushing 66 may be received within the drive bearing 64. The crank pin 52 may be received within the drive bushing 66. An Oldham coupling 68 may be engaged with the end plate 58 and either the non-orbiting scroll 56 or the first bearing housing 36 to prevent relative rotation between the orbiting and non-orbiting scrolls 54, 56. The annular hub 62 may be axially supported by a thrust surface 70 of the first bearing housing 36. The annular hub 62 may movably engage a seal 72 attached to the first bearing housing 36 to define an intermediate-pressure cavity 73 between the first bearing housing 36 and the orbiting scroll 54.
The end plate 58 of the orbiting scroll 54 may include a first VVR port 74 and a second VVR port 76. The first and second VVR ports 74, 76 may extend through the end plate 58 and are in selective fluid communication with the cavity 63 formed by the annular hub 62. In some configurations, the end plate 58 may include a plurality of first VVR ports 74 and a plurality of second VVR ports 76. The VVR valve assembly 22 may be disposed within the cavity 63 and may be mounted to the end plate 58. As will be described in more detail below, the VVR valve assembly 22 is operable to selectively allow and restrict communication between the first and second VVR ports 74, 76 and the cavity 63. The cavity 63 is in communication with the discharge chamber 24 via gaps between the hub 62 and the drive bearing 64, between the drive bearing 64 and drive bushing 66, and/or between the drive bushing 66 and the crank pin 52. In some configurations, cavity 63 is in communication with the discharge chamber 24 via flow passages formed in any one or more of the hub 62, drive bearing 64, or drive bushing 66, for example. Therefore, the VVR valve assembly 22 is operable to selectively allow and restrict communication between the first and second VVR ports 74, 76 and the discharge chamber 24.
The non-orbiting scroll 56 may include an end plate 78 and a spiral wrap 80 projecting downwardly from the end plate 78. The spiral wrap 80 may meshingly engage the spiral wrap 60 of the orbiting scroll 54, thereby creating a series of moving fluid pockets therebetween. The fluid pockets defined by the spiral wraps 60, 80 may decrease in volume as they move from a radially outer position 82 (
As described above, the VVR valve assembly 22 may be disposed within the cavity 63 and may be mounted to the end plate 58 of the orbiting scroll 54. The VVR valve assembly 22 may include a valve member 90 and a retainer (backer plate) 92. The valve member 90 may be a thin and resiliently flexible elongated reed valve having a first end portion 94, and a second end portion 96, and a central portion 98 disposed between the first and second end portions 94, 96. An aperture 100 extends through the central portion 98. The retainer 92 may be a rigid elongated member having a first end portion 102, a second end portion 104, and a central portion 106 disposed between the first and second end portions 102, 104. An aperture 108 extends through the central portion 106. A fastener 110 (e.g., a bolt, rivet, etc.) may extend through the apertures 100, 108 of the valve member 90 and retainer 92 and may engage the end plate 58 of the orbiting scroll 54 to fixedly secure the retainer 92 and the central portion 98 of the valve member 90 to the end plate 58 (i.e., such that the valve member 90 is sandwiched between the retainer 92 and the end plate 58). One or more pins 112 (
The first and second end portions 102, 104 of the retainer may be tapered or angled to form gaps between distal ends of the first and second end portions 102, 104 and the end plate 58. The gaps provide clearance to allow the first and second end portions 94, 96 of the valve member 90 to bend (relative to the central portion 98) away from the end plate 58.
The VVR ports 74, 76 and the VVR valve assembly 22 are operable to prevent the compression mechanism 20 from over-compressing working fluid. Over-compression is a compressor operating condition where the internal compressor-pressure ratio of the compressor (i.e., a ratio of a pressure of a fluid pocket in the compression mechanism at a radially innermost position to a pressure of a fluid pocket in the compression mechanism at a radially outermost position) is higher than a pressure ratio of a climate-control system in which the compressor is installed (i.e., a ratio of a pressure at a high side of the climate-control system to a pressure of a low side of the climate-control system). In an over-compression condition, the compression mechanism is compressing fluid to a pressure higher than the pressure of fluid downstream of a discharge fitting of the compressor. Accordingly, in an over-compression condition, the compressor is performing unnecessary work, which reduces the efficiency of the compressor. The VVR valve assembly 22 of the present disclosure may reduce or prevent over-compression by selectively venting the fluid pockets at the radially intermediate positions 84 to the discharge chamber 24 (via the VVR ports 74, 76 and the cavity 63) when the pressure within such fluid pockets has exceeded (or sufficiently exceeded) the pressure in the discharge chamber 24.
When fluid pressure within fluid pockets at the radially intermediate positions 84 are sufficiently higher (i.e., higher by a predetermined value determined based on the spring rate of the valve member 90) than the fluid pressure within the discharge chamber 24, the fluid pressure within the fluid pockets at the radially intermediate positions 84 can bend the end portions 94, 96 of the valve member 90 away from the end plate 58 to an open position (shown in
It will be appreciated that the end portions 94, 96 can move between the open and closed positions together or independently of each other based on the fluid pressures within the respective fluid pockets to which the respective VVR ports 74, 76 are exposed. In other words, one of the end portions 94, 96 could be in the open position while the other of the end portions 94, 96 could be in the closed position.
Referring now to
Like the orbiting scroll 54, the orbiting scroll 154 may include an end plate 158 having a spiral wrap 160 extending therefrom. An annular hub 162 may project downwardly from the end plate 158 and may include a cavity 163 in which a drive bearing 164, the drive bushing 66 (not shown in
The VVR valve assembly 122 may be disposed within the cavity 163 and may be mounted to the end plate 158 of the orbiting scroll 154. The VVR valve assembly 122 may include a first valve member 190, a second valve member 191, a retainer 192, a first spring 194, and a second spring 196.
The first and second valve members 190, 191 may be disc-shaped members and may include one or more flow passages (cutouts) 198 formed in their peripheries, as shown in
The retainer 192 may be a rigid elongated member having a first end portion 202, a second end portion 204, and a central portion 206 disposed between the first and second end portions 202, 204. One or more fasteners 209 (e.g., bolts, rivets, etc.) may extend through one or more apertures 208 in the central portion 206 and may engage the end plate 158 to fixedly secure the retainer 192 to the end plate 158. The end portions 202, 204 of the retainer 192 may be angled relative to the central portion 206.
First and second pins 210, 211 may extend from respective end portions 202, 204 and may extend into the respective recesses 200, 201 and partially through respective springs 194, 196. The first spring 194 is disposed between and in contact with the first end portion 202 and the first valve member 190. The second spring 196 is disposed between and in contact with the second end portion 204 and the second valve member 191.
The valve members 190, 191 are movable within the recesses 200, 201 between an open position in which the valve members 190, 191 are spaced apart from the valve seats 203, 205 and closed positions in which the valve members 190, 191 are in contact with the valve seats 203, 205. The first and second springs 194, 196 bias the first and second valve members 190, 191 toward the closed position. In the closed position, the valve members 190, 191 restrict or prevent fluid flow from the VVR ports 174, 176 to the cavity 163. In the open position, the valve members 190, 191 allow working fluid to flow from the VVR ports 174, 176 into the recesses 200, 201, through the flow passages 198 in the valve members 190, 191 and into the cavity 163 and into the discharge chamber 24.
It will be appreciated that the valve members 190, 191 can move between the open and closed positions together or independently of each other based on the fluid pressures within the respective fluid pockets to which the respective VVR ports 174, 176 are exposed. In other words, as shown in
Referring now to
Like the orbiting scroll 54, the orbiting scroll 254 may include an end plate 258 having a spiral wrap 260 extending therefrom. An annular hub 262 may project downwardly from the end plate 258 and may include a cavity 263 in which a drive bearing 264, the drive bushing 66 (not shown in
The hub 262 may be a two-piece hub including a first annular member 280 and a second annular member 282. The first annular member 280 may be integrally formed with the end plate 258. The second annular member 282 may be partially received within the first annular member 280 and may receive the drive bearing 264. In some configurations, the second annular member 282 may include one or more flow passages 284 that extend through the second annular member 282, as shown in
Referring now to
Like the orbiting scroll 254, the orbiting scroll 354 may include an end plate 358 having a spiral wrap 360 extending therefrom. An annular hub 362 may project downwardly from the end plate 358 and may include a cavity 363 in which a drive bearing 364, the drive bushing 66 (not shown in
The hub 362 may be a two-piece hub including a first annular member 380 and a second annular member 382. The first annular member 380 may be integrally formed with the end plate 358. The second annular member 382 may be partially received within the first annular member 380 and may receive the drive bearing 364. In some configurations, the second annular member 382 may include one or more flow passages 384 that extend through the second annular member 382, as shown in
Like the VVR valve assembly 122, the VVR valve assembly 322 may include first and second valve members 390, 391, first and second springs 394, 396, and first and second pins 310, 311. The valve members 390, 391 may be similar or identical to the valve members 190, 191. The tabs 386 of the second annular member 382 of the hub 362 may be fixed relative to the end plate 358 and may take the place of (and have the same or similar function as the retainer 192). The pins 310, 311 may be mounted to respective tabs 386, may extend into respective recesses 375, 377, may extend partially through respective springs 394, 396, and may be in contact with respective valve members 390, 391. Like the valve members 190, 191, the valve members 390, 391 are movable within the recesses 375, 377 between open and closed positions to control fluid flow through the VVR ports 374, 376.
Referring now to
Like the orbiting scroll 54, the orbiting scroll 454 may include an end plate 458 having a spiral wrap 460 extending therefrom. An annular hub 462 may project downwardly from the end plate 458 and may include a cavity 463 in which a drive bearing 464, the drive bushing 66 (not shown in
The orbiting scroll 454 may include a first portion 455 and a second portion 456 attached to the first portion 455 by a plurality of fasteners 457. The first portion 455 may include the spiral wrap 460 and a portion of the end plate 458 having a plurality of VVR ports 474 and a plurality of recesses 475. Like recesses 200, 201, the recesses 475 define valve seats. Each recess 475 is in communication with and generally aligned with a respective VVR port 474. The second portion 456 may include another portion of the end plate 458 and the annular hub 462. The portion of the end plate 458 defined by the second portion 456 may include a radially extending flow passage 476 in communication with the recesses 475 and one or more axially extending flow passages 477 in communication with the radially extending flow passage 476. In the configuration shown
The VVR valve assembly 422 may include a plurality of valve members 490 (which may be similar or identical to the valve members 190, 191), a plurality of springs 494 (which may be similar or identical to the springs 194, 196), and a plurality of pins 496 (which may be similar or identical to the pins 210, 211). The pins 496 are mounted to the second portion 456 of the orbiting scroll 454 and may extend partially into respective recesses 475. The valve members 490 are movable within recesses 475 between open and closed positions to control fluid flow between the VVR ports 474 and the flow passages 476, 477 in the same or similar manner in which valve members 190, 191 control fluid flow between VVR ports 174, 176 and the cavity 163.
Referring now to
Like the orbiting scroll 254, the orbiting scroll 554 may include an end plate 558 having a spiral wrap 560 extending therefrom. An annular hub 562 may project downwardly from the end plate 558 and may include a cavity 563 in which a drive bearing 564, the drive bushing 66 (not shown in
The hub 562 may be a two-piece hub including a first annular member 580 and a second annular member 582. The first annular member 580 may be integrally formed with the end plate 558. A portion of the axially extending portions 577 of the VVR ports 574, 576 may extend through the first annular member 580, and the radially extending portions 579 of the VVR ports 574, 576 extend through a portion of the first annular member 580. The second annular member 582 may be partially received within the first annular member 580 and may receive the drive bearing 564. The second annular member 582 may include one or more flow passages 584 that extend through the second annular member 582, as shown in
The VVR valve assembly 522 may include a valve member 590 that is received within the recess 586 of the second annular member 582. The valve member 590 may be a generally C-shaped, thin and resiliently flexible reed valve having a first end portion 592, and a second end portion 594, and a central portion 596 disposed between the first and second end portions 592, 594. The contoured recess 586 of the second annular member 582 may be shaped to fixedly receive the central portion 596 and movably receive the first and second end portions 592, 594 such that the first and second end portions 592, 594 are able to flex between outward and inward between closed positions (in which the end portions 592, 594 are in contact with an inner diametrical surface 598 of the first annular member 580) and open positions (in which the end portions 592, 594 are spaced apart from the inner diametrical surface 598 of the first annular member 580).
In
Referring now to
Like the compressor 10, the compressor 610 may be a high-side scroll compressor including a hermetic shell assembly 612, a first and second bearing assemblies 614, 616, a motor assembly 618, a compression mechanism 620, and a variable-volume-ratio (VVR) valve assembly 622. The first bearing assembly 614 may be generally similar to the first bearing assembly 14 (i.e., the first bearing assembly 614 is fixed to the shell assembly 612, rotationally supports a driveshaft 648, and axially supports an orbiting scroll 654).
The driveshaft 648 may include an end portion (e.g., a collar portion) 649 having an eccentric recess 650 that receives a drive bearing 664 and a hub 662 of the orbiting scroll 654. The end portion 649 may include a flow passage 652 that provides communication between a discharge chamber 624 of the compressor 610 and a cavity 663 in the hub 662 (i.e., to provide communication between VVR ports 674, 676 and the discharge chamber 624).
The VVR valve assembly 622 can be similar or identical to any of the VVR valve assemblies 22, 122, 322, 422, 522 described above. The orbiting scroll 654 can be similar to any of the orbiting scrolls 54, 154, 254, 354, 454, 554 described above.
The foregoing description of the embodiments has been provided for purposes of illustration and description. It is not intended to be exhaustive or to limit the disclosure. Individual elements or features of a particular embodiment are generally not limited to that particular embodiment, but, where applicable, are interchangeable and can be used in a selected embodiment, even if not specifically shown or described. The same may also be varied in many ways. Such variations are not to be regarded as a departure from the disclosure, and all such modifications are intended to be included within the scope of the disclosure.
This application claims the benefit of U.S. Provisional Application No. 62/567,277, filed on Oct. 3, 2017. The entire disclosure of the above application is incorporated herein by reference.
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Office Action regarding Indian Patent Application No. 1307/MUMNP/2015, dated Sep. 12, 2018. |
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Number | Date | Country | |
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20190101120 A1 | Apr 2019 | US |
Number | Date | Country | |
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62567277 | Oct 2017 | US |