The present disclosure relates to a variable capacity reciprocating compressor.
This section provides background information related to the present disclosure and is not necessarily prior art.
A climate-control system such as, for example, a heat-pump system, a refrigeration system, or an air conditioning 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 one or more compressors circulating a working fluid (e.g., refrigerant or carbon dioxide) between the indoor and outdoor heat exchangers. Efficient and reliable operation of the one or more compressors is desirable to ensure that the climate-control system in which the one or more compressors are 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.
In one form, the present disclosure provides a reciprocating compressor that may include a shell, a first cylinder, a plate, a second cylinder, and a piston. The first cylinder may be disposed within the shell and may include a first valve. The plate may be fixed relative to the first cylinder and may include a second valve. The second cylinder may be axially aligned with the first cylinder and may be moveable relative to the first cylinder between first and second positions. The piston may be disposed within the second cylinder and may include a third valve. The piston may reciprocate relative to the first and second cylinders. The piston and the plate may define a first compression chamber therebetween. The piston and the first cylinder may define a second compression chamber therebetween.
In some embodiments, the third valve may be movable between a first position restricting communication between the first and second compression chambers and a second position allowing communication between the first and second compression chambers.
In some embodiments, an inner diametric surface of the second cylinder may include an opening extending therethrough and communicating with an interior volume of the shell.
In some embodiments, the opening in the second cylinder may be isolated from the first compression chamber when the second cylinder is in the first position and may be allowed to communicate with the first compression chamber when the second cylinder is in the second position.
In some embodiments, motion of the piston toward the plate compresses fluid within the first compression chamber and forces fluid into the second compression chamber.
In some embodiments, fluid within the first compression chamber may be compressed therein to a first pressure when the second cylinder is in the first position and may be compressed therein to a second pressure when the second cylinder is in the second position. The second pressure may be lower than the first pressure.
In some embodiments, fluid may be compressed to a first discharge pressure in the second compression chamber when the second cylinder is in the first position and fluid is compressed to a second discharge pressure in the second compression chamber when the second cylinder is in the second position. The second discharge pressure may be lower than the first discharge pressure.
In some embodiments, the first cylinder may include a fluid-injection passage in communication with the second compression chamber.
In some embodiments, the reciprocating compressor may include a crankshaft driving the piston. The second cylinder may move between the first and second positions independently of motion of the crankshaft.
In another form, the present disclosure provides a reciprocating compressor operable in a full-capacity mode and in a reduced-capacity mode. The reciprocating compressor may include first and second cylinders and a piston. The second cylinder may at least partially surround the first cylinder and may be axially movable relative to the first cylinder between a first position corresponding to the full-capacity mode and a second position corresponding to the reduced-capacity mode. The piston may reciprocate within the second cylinder and may reciprocatingly receiving the first cylinder.
In some embodiments, the first cylinder and the piston may define a compression chamber therebetween.
In some embodiments, the first cylinder may include a fluid-injection passage in communication with the compression chamber.
In some embodiments, the reciprocating compressor may include a plate fixed relative to the first cylinder and cooperating with the piston and the second cylinder to define a first compression chamber. The piston and the first cylinder may cooperate to define a second compression chamber therebetween.
In some embodiments, the piston may include a first valve movable between a first position restricting communication between the first and second compression chambers and a second position allowing communication between the first and second compression chambers.
In some embodiments, the plate may include a second valve that may close to restrict fluid flow into the first compression chamber when the piston is moving toward the plate and may open to allow fluid flow into the first compression chamber when the piston is moving away from the plate.
In some embodiments, the first cylinder may include a third valve that closes to restrict fluid flow out of the second compression chamber when the piston is moving toward the plate and opens to allow fluid flow out of the second compression chamber when the piston is moving away from the plate.
In some embodiments, fluid within the first compression chamber may be compressed therein to a first pressure when the second cylinder is in the first position and may be compressed therein to a second pressure when the second cylinder is in the second position. The second pressure may be lower than the first pressure.
In some embodiments, an inner diametric surface of the second cylinder may include an opening extending therethrough.
In some embodiments, the opening in the second cylinder may be isolated from the first compression chamber when the second cylinder is in the first position. The opening may be allowed to communicate with the first compression chamber when the second cylinder is in the second position.
In some embodiments, the reciprocating compressor may include a crankshaft driving the piston. The second cylinder may move between the first and second positions independently of motion of the crankshaft.
In some embodiments, the piston may compress fluid to a first discharge pressure when the second cylinder is in the first position and the piston may compress fluid to a second discharge pressure when the second cylinder is in the second position. The second discharge pressure may be lower than the first discharge pressure.
In another form, the present disclosure provides a compressor including a compression mechanism that may include a piston and a cylinder defining a compression chamber therebetween. The piston may be movable within the cylinder in a first direction to draw working fluid into the compression chamber and movable within the cylinder in a second direction to compressor the working fluid in the compression chamber and discharge compressed working fluid from the compression chamber through a passage. The cylinder including an opening in selective communication with the compression chamber. The compression mechanism may be operable in a full-capacity mode in which communication between the compression chamber and the opening is restricted and in a reduced-capacity mode in which communication between the opening and the compression chamber is allowed during at least a portion of a duration of movement of the piston in the second direction.
In some embodiments, the compressor may include a shell containing the compression mechanism. In some embodiments, the shell may define a suction-pressure chamber in communication with the opening in the cylinder. In some embodiments, the cylinder may be movable relative to the shell between a first position allowing communication between the opening and the compression chamber and a second position restricting communication between the opening and the compression chamber.
In some embodiments, the compression mechanism may be a single-stage compression mechanism.
In some embodiments, the compression mechanism may be a multi-stage compression mechanism.
In some embodiments, the compression mechanism includes a fluid-injection passage extending through the first cylinder and provides a working fluid from a source. A valve in the fluid-injection passage is moveable between an open position allowing fluid to be injected into the second compression chamber through the fluid-injection passage and a closed position restricting fluid communication between the second compression chamber and the fluid-injection passage.
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 compression mechanism 16 may include a first cylinder 28, a suction plate 30, a piston 32, and a second cylinder 34. The first cylinder 28 may be fixed relative to the discharge muffler 24 and the shell 12 and may include an outer diametrical surface 36, an inner diametrical surface 38, and an axial end wall 40. The inner diametrical surface 38 and axial end wall 40 may define a conduit 42 in fluid communication with the discharge muffler 24. The axial end wall 40 may include a discharge passage 44 extending therethrough and in selective communication with the conduit 42. A first valve member 46 may be movable relative to the axial end wall 40 between an open position (
The suction plate 30 may be fixed relative to the first cylinder 28 and may be spaced apart and generally parallel to the axial end wall 40. The suction plate 30 may include an outer circumferential surface 48 and one or more suction passages 50. The circumferential surface 48 may slidably engage the second cylinder 34. In some embodiments, a piston ring (not shown) or other sealing member may sealingly engage the circumferential surface 48 and the second cylinder 34. One or more second valve members 52 may be movable relative to the suction plate 30 between an open position (
The piston 32 may include a base portion 54 and a cup portion 56. The base portion 54 may be generally parallel to and disposed between the suction plate 30 and the axial end wall 40 of the first cylinder 28. A circumferential surface 58 of the base portion 54 may slidably engage the second cylinder 34. The cup portion 56 may extend in an axial direction from the base portion 54 and may reciprocatingly receive the first cylinder 28. An inner diametrical surface 60 of the cup portion 56 may slidably and sealingly engage the outer diametrical surface 36 of the first cylinder 28. One or more connecting rods 61 (
The base portion 54 of the piston 32, the suction plate 30 and the second cylinder 34 may cooperate to define a first compression chamber 62. The base portion 54, the cup portion 56, and the axial end wall 40 of the first cylinder 28 may cooperate to define a second compression chamber 64. The base portion 54 may include one or more intermediate passages 66 and one or more third valve members 68 that are movable relative to the base portion 54 between an open position (
The second cylinder 34 may at least partially surround the first cylinder 28, the suction plate 30, and the piston 32 and may include one or more ports or openings 70 that extend radially through inner and outer diametrical surfaces 72, 74 of the second cylinder 34. The second cylinder 34 may be movable in an axial direction relative to the first cylinder 28, the suction plate 30, and the piston 32 between a first position (
With continued reference to
In the full-capacity mode, movement of the piston 32 away from the suction plate 30 (as shown in
After reaching the top-dead-center position, the piston 32 moves back toward the suction plate 30 (as shown in
In the reduced-capacity mode, the openings 70 are in fluid communication between the first compression chamber 62 for at least a portion of the stroke of the piston 32 so that working fluid within the first compression chamber 62 can leak to the interior volume 18. Therefore, the pressure of the fluid within the first compression chamber 62 may be substantially equal to the pressure of the fluid within the interior volume 18 (i.e., suction pressure) as long as the first compression chamber 62 is in communication with the openings 70. Therefore, in the reduced-capacity mode, the compression mechanism 16 may not begin to compress the working fluid until the base portion 54 of the piston 32 moves between the openings 70 and the suction plate 30 to seal off the first compression chamber 62 from the openings 70 (as shown in
With reference to
The first cylinder 128 may include a vertically extending portion 138 having a fluid-injection passage 139 extending therethrough. A check valve 141 may be mounted to the first cylinder 128 and may be movable relative thereto between an open position allowing fluid to be injected into the second compression chamber 164 through the fluid-injection passage 139 and a closed position restricting fluid communication between the second compression chamber 164 and the fluid-injection passage 139. The fluid-injection passage 139 may receive intermediate-pressure working fluid from an economizer or vapor-injection circuit (not shown), a metered liquid refrigerant supply, and/or oil from an oil separator or sump, for example. Fluid may be injected into the second compression chamber 164 through the fluid-injection passage 139 when the compression mechanism 116 is in the full-capacity mode or in the reduced capacity mode. Injecting intermediate-pressure working fluid into the second compression chamber 164 when the compression mechanism 116 is in the full-capacity mode may result in a capacity output of greater than one-hundred percent.
With reference to
The first cylinders 228 may be integrally formed with the body 219 and each may include a conduit 242 in communication with a common manifold 243 formed in the body 219. The manifold 243 may include an outlet 245 in communication with a discharge muffler (not shown) and/or an outlet (not shown) of the compressor. The body 219 may be fixed relative to the shell 12.
As described above, the suction plate 230 and the piston 232 may cooperate to define a first compression chamber 262 therebetween, and the piston 232 and the first cylinder 228 may cooperate to define a second compression chamber 264 therebetween. The pistons 232 may be driven by a common crankshaft 221. As described above, the second cylinder 234 may be movable relative to the suction plate 230 to control communication between openings 270 in the second cylinder 234 and the first compression chamber 262, thereby controlling the capacity output of the compression mechanism 216.
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. patent application Ser. No. 14/337,589, filed Jul. 22, 2014, now U.S. Pat. No. 9,476,414, and U.S. Provisional Application No. 61/863,550, filed on Aug. 8, 2013. The entire disclosure of the above applications is incorporated herein by reference.
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Entry |
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Number | Date | Country | |
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20170096997 A1 | Apr 2017 | US |
Number | Date | Country | |
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61863550 | Aug 2013 | US |
Number | Date | Country | |
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Parent | 14337589 | Jul 2014 | US |
Child | 15332728 | US |