The related technologies indicate that when a refrigeration cycle device, like an air conditioner, is operating under a large load, such as heating under an ultra-low temperature, a gas suction mass flow rate of a compressor is decreased due to a large specific volume of a refrigerant, which causes a sharp decrease in heating capacity of the compressor, and meanwhile makes oil return difficult; the heat taken away by the refrigerant is reduced, which may easily cause abrasion of a compressor pump body, a decline of reliability of an electric motor, and a low system energy efficiency.
The present inventor is intended to solve one of the technical problems in the related art to at least some extent. Therefore, one object of the present inventor is to provide a two-stage rotary compressor with improved performance under various environment temperatures and high reliability.
Another object of the present inventor is to provide a refrigeration cycle device having the above-identified two-stage rotary compressor.
According to embodiments of a first aspect of the present invention, the two-stage rotary compressor includes: a gas injection pipe; a housing provided with a liquid reservoir outside the housing and a gas injection chamber within the housing, the gas injection chamber being connected to the liquid reservoir and the gas injection pipe; two cylinders disposed within the housing and spaced apart from each other, a first cylinder of the two cylinders being communicated with the gas injection chamber, a second cylinder thereof being communicated with the liquid reservoir and having a sliding vane groove extending in a radial direction and a compression chamber, and an exhaust hole of the compression chamber being in communication with the gas injection chamber; a piston disposed within the gas injection chamber and capable of rolling along an inner wall of the gas injection chamber; and a sliding vane movably disposed inside the sliding vane groove and having an outer end together with an inner wall of the sliding vane groove defining a backpressure chamber communicated with the gas injection chamber, wherein the sliding vane is configured to be received in the sliding vane groove when the gas injection chamber is in communication with the liquid reservoir, and an inner end of the sliding vane abuts against the piston when the gas injection chamber is in communication with the gas injection pipe.
The two-stage rotary compressor according to embodiments of the present invention, when the refrigeration cycle device like an air conditioner is operating under a large load such as heating under an ultra-low temperature, the adoption of two-stage gas injection compression may efficiently increase a gas mass flow rate, improve heating capacity and energy efficiency of the refrigeration cycle device, and improve pump body lubrication; for refrigeration under an ordinary temperature work condition, the adoption of single-stage compression may improve the efficiency and energy efficiency of the refrigeration cycle device.
In addition, the two-stage rotary compressor according to the embodiments of the present invention may also have the additional technical features as followed:
Optionally, a bottom of a lower one of the two cylinders is provided with a bearing; a bottom of the bearing is provided with a cover plate; the cover plate and the bearing together define the gas injection chamber.
Optionally, an isolating device is provided between the two cylinders, and defines the gas injection chamber therein.
Specifically, the isolating device includes an isolating body having an open top and/or an open bottom; and an isolating plate disposed to the top and/or the bottom of the isolating body, and defining the gas injection chamber together with the isolating body.
Optionally, the gas injection chamber is connected with the liquid reservoir and the gas injection pipe via a three-way valve.
Further, the gas injection chamber has a gas suction hole connected to the three-way valve, and the backpressure chamber is in communication with the gas suction hole.
Optionally, an exhaust volume of the first cylinder is V1 and an exhaust volume of the second cylinder is V2 , wherein V1/V2=0.45˜0.95.
Optionally, a height of the first cylinder is smaller than a height of the second cylinder; a crankshaft is provided in the housing and provided with two eccentric portions spaced apart from each other along an axial direction, and a lower end of the crankshaft extends into the two cylinders; and the two eccentric portions are respectively located in the two cylinders, eccentric amount of the eccentric portion within the first cylinder being larger than eccentric amount of the eccentric portion within the second cylinder.
According to a second aspect of the present invention, the refrigeration cycle device includes a evaporator; a condenser connected to the evaporator; a throttling device disposed between the evaporator and the condenser; a flash evaporator disposed between the throttling device and the condenser; and a two-stage rotary compressor according to the first aspect of the present invention, which has a gas return port and a gas outlet; the evaporator and the condenser are in communication with the gas return port and the gas outlet respectively via a four-way valve, and the evaporator is connected to the gas injection pipe.
The refrigeration cycle device according to embodiments of the present invention, by setting the two-stage rotary compressor according to the embodiments of the first aspect, may choose the single-stage operation under a small load and adopt the two-stage operation under a large load, so that the overall performance, the reliability and the energy efficiency of the refrigeration cycle device are effectively improved.
Further, a control valve is provided between the condenser and the flash evaporator; and a bypass valve is connected to the control valve and the flash evaporator in parallel.
Furthermore, refrigeration cycle device also includes a first throttling device disposed between the control valve and the flash evaporator and a first control valve disposed between the flash evaporator and the throttling device; and the control valve, the first throttling device and the flash evaporator are connected to the bypass valve in parallel.
Optionally, the throttling device is a capillary tube or an expansion valve.
Further, a second control valve is provided between the gas return port and the gas injection pipe.
Optionally, the refrigeration cycle device is an air conditioner.
Further, the refrigeration cycle device further includes a water tank connected to the evaporator to exchange heat with the evaporator.
Optionally, the refrigeration cycle device is a heat-pump water heater.
Embodiments of the present invention will be described in detail and examples of the embodiments will be illustrated in the drawings, in which same or similar reference numerals are used to indicate same or similar members or members with same or similar functions throughout the specification. The embodiments described herein with reference to drawings are explanatory, which are used to illustrate the present invention, but shall not be construed to limit the present invention.
A two-stage rotary compressor 100 according to embodiments of a first aspect of the present invention may be used in a refrigeration cycle device like an air conditioner. In the following description of the present application, the two-stage rotary compressor 100 used in the air conditioner is exemplified. Of course, it should be understood by those in the art that the two-stage rotary compressor 100 according to the present inventor may also be used in a heat-pump water heater.
As shown in
A liquid reservoir 3 is disposed outside the housing 2, and a gas injection chamber 651 is disposed within the housing 2. In an example of
The compression device 6 includes two cylinders, two pistons, two sliding vans, two bearings, a partition plate 63 and a crankshaft 67. To be convenient for description, two cylinders, two pistons, two sliding vanes, two bearings are distinguished as a first cylinder 62 and a second cylinder 64, a first piston 622 and a second piston 642, a first sliding vane 623 and a second sliding vane 643, and a main bearing 61 and an auxiliary bearing 65 respectively.
The first cylinder 62 and the second cylinder 64 are configured as a cylindrical shape with an open top and an open bottom; the first cylinder 62 and the second cylinder 64 are spaced apart from each other in a up-and-down direction and the first cylinder 62 is located above the second cylinder 64; the first cylinder 62 and the second cylinder 64 are respectively formed with a first sliding vane groove and a second sliding vane groove extending in a radial direction, and the first sliding vane 623 and the second vane 643 are received in the first sliding vane groove and the second sliding vane groove respectively and movable in an inward and outward direction; an outer end of the first sliding vane 623 is connected with a spring, and an inner end of the first sliding vane 623 always keeps in contact with an outer circumferential wall of the first piston 622 under an elastic force of the spring; the partition plate 63 is disposed between the first cylinder 62 and the second cylinder 64, the main bearing 61 is disposed on the top of the first cylinder 62, and the auxiliary bearing 65 is disposed on the bottom of the second cylinder 64, such that the main bearing 61, the first cylinder 62 and the partition plate 63 together define the first compression chamber 621 while the partition plate 63, the second cylinder 64 and the auxiliary bearing 65 together define the second compression chamber 641; an upper end of the crankshaft 67 is connected to the rotator 42 of the electric motor 4 and driven to rotate by the rotator 42; a lower end of the crankshaft 67 successively passes through the main bearing 61 and the partition plate 63, and extends into the first compression chamber 621 and the second compression chamber 641; a first eccentric portion 671 and a second eccentric portion 672 are provided on the crankshaft 67, and spaced apart from each other along an axial direction of the crankshaft 67; the first piston 622 and the second piston 642 are respectively fitted over the first eccentric portion 671 and the second eccentric portion 672, and are capable of rolling along inner walls of the first compression chamber 621 and the second compression chamber 641. Here, it should be noted that the “inward” direction may be construed as a direction towards a center of the first cylinder 62 or the second cylinder 64, and an opposite direction thereof is defined as the “outward” direction, i.e. a direction away from the center of the first cylinder 62 or the second cylinder 64.
Two cylinders (i.e. the first cylinder 62 and the second cylinder 64) are both disposed within the housing 2 and spaced apart from each other in a vertical direction (for example, the up-and-down direction in
The other one of the two cylinders (for example, the second cylinder 62 in
A sliding vane (for example, the second sliding vane 643 in
When the gas injection chamber 651 is in communication with the gas injection pipe 1, the inner end of the second sliding vane 643 abuts against the piston (i.e. the second piston 642). For example, when the air conditioner is under a low-temperature work condition, the second cylinder sucks a low-pressure gas from an outlet of an evaporator 201 of the air conditioner, and the gas injection chamber 651 sucks a medium-pressure from a flash evaporator 204 of the air conditioner, in which case the pressures of the inner and the outer ends of the second sliding vane are unequal. That is, it is the low-pressure gas with lower pressure in the second compression chamber 641 while it is the medium-pressure gas with higher pressure in the backpressure chamber 644. The second sliding vane 643 abuts against the second piston 642 under the action of the pressure difference, and the second cylinder 64 is loaded; after being compressed by the second cylinder 64, the gas in the gas injection chamber 651 becomes a mixture gas of the gas compressed by the second cylinder 64 and the medium-gas from the flash evaporator 204; the first cylinder 62 sucks the medium-pressure gas and then performs the second compression; after being compressed to a high pressure, the gas is exhausted to an accommodation space of the housing 2. In such a way, the two-stage compression is achieved.
Thereby, the second sliding vane 643 is controlled by the gas pressure of the gas injection chamber 651. When operating in a single-stage mode, the gas pressure of the gas injection 651 is low, and is equal to the pressure of the second cylinder 64. That is, the second sliding vane 643 is decompressed and does not act, so as to decrease the abrasion of the two-stage rotary compressor 100 and improve the energy efficiency of the two-stage rotary compressor 100. When operating in a two-stage mode, the gas pressure in the gas injection 651 is medium, so the gas pressure of the backpressure chamber 644 is medium; compared with the high pressure in the housing 2 and outside the compression device 6, the pressure difference of the inner and the outer ends of the second sliding vane 643 is decreased, thus reducing the abrasion of the second sliding vane 643, and protecting the second sliding vane 643 efficiently; further, the abrasion of the two-stage rotary compressor 100 is reduced and the service life of the two-stage rotary compressor 100 is improved.
The two-stage rotary compressor 100 according to embodiments of the present invention, when a refrigeration cycle device 200, like an air conditioner, is operating under a large load, such as heating under an ultra-low temperature, the adoption of the two-stage gas injection compression may efficiently increase the gas mass flow rate, improve the heating capacity and energy efficiency of the refrigeration cycle device 200, and improve the pump body lubrication; for refrigeration under an ordinary temperature work condition, the adoption of the single-stage compression may improve the efficiency and energy efficiency of the refrigeration cycle device 200.
In an embodiment of the present invention, as shown in
Of course, the present invention is not limited thereto, and in other embodiments of the present invention, referring to
In an example of
In an embodiment of the present invention, the gas injection chamber 651 is connected to the liquid reservoir 3 and the gas injection pipe 1 via a three-way valve 5, as shown in
Further, the gas injection chamber 651 has a gas suction hole 652 connected to the three-way valve 5, and the backpressure chamber 644 is in communication with the gas suction hole 652. Referring to
Optionally, an exhaust volume of one cylinder (for example, the first cylinder 62 in
Optionally, a height of the one cylinder (for example, the first cylinder 62 in
As shown in
The condenser 202 is connected to the evaporator 201. The throttling device 203 is disposed between the evaporator 201 and the condenser 202. The flash evaporator 204 is disposed between the throttling device 203 and the condenser 202. The two-stage rotary compressor 100 has a gas return port 33 and a gas outlet 21; the evaporator 201 and the condenser 202 are respectively in communication with the gas return port 33 and the gas outlet 21 via a four-way valve 206; the flash evaporator 204 is connected to the gas injection pipe 1. Further, a control valve 207 may be provided between the condenser 202 and the flash evaporator 204; the refrigeration cycle device 200 further includes a bypass valve 205 connected to the control valve 207 and the flash evaporator 204 in parallel. When the refrigeration cycle device 200, like the air conditioner, is operating under a low load, the bypass valve 205 makes the gas out of the condenser 202 not pass through the flash evaporator 204 and be bypassed to the throttling device 203. Optionally, as shown in
When the refrigeration cycle device 200 is an air conditioner and when the air conditioner conducts the refrigeration, as shown in
When the air conditioner conducts the heating, as shown in
The refrigeration cycle device 200 according to embodiments of the present invention, like an air conditioner, by setting the above-described two-stage rotary compressor 100 according to embodiments of the first aspect, may choose the single-stage operation under a small load and adopt the two-stage operation under a large load, so that the overall performance, the reliability and the energy efficiency of the refrigeration cycle device 200 may be improved effectively.
In an embodiment of the present invention, referring to
As shown in
As shown in
In addition, the refrigeration cycle device 200 further includes: a water tank (not illustrated) connected to the evaporator 201 to exchange heat with the evaporator 201. Optionally, the refrigeration cycle device 200 is a heat-pump water heater. When the refrigeration cycle device 200 is the heat pump water heater, the evaporator 201 performs the heat exchange with the water tank, and the system cycle is consistent with the above-described refrigerating and heating processes. In the heating process, the pressure difference is relatively large, in particular under the low-temperature heating and the heat-pump work condition, the adoption of the two-stage compression cycle may effectively improve the system heating capacity and the energy efficiency.
As shown in
Further, a second control valve 2041 is provided between the gas return port 33 and the gas injection pipe 1. Specifically, the gas injection pipe 1 is in communication with the low-pressure gas suction pipe 31, and the second control valve 2041 is provided between them; the second control valve 2041 is opened only under the defrosting mode, and closed under other modes; in the defrosting mode, the low-temperature refrigerant enters the gas injection chamber 651 and the second cylinder 64 of the two-stage rotary compressor 100 via the gas injection circuit, which may effectively prevent the second cylinder 64 from a situation of the gas suction negative pressure. In the defrosting mode, the pressure difference of the high pressure and the low pressure is small, and the pressure ratio thereof is small. If the two-stage compression is adopted, an excessive compression may occur easily, resulting in a rise in the power dissipation, but if adopting the circuit above-described is adopted, the situation may be avoided.
In the specification, it is to be understood that terms such as “central”, “transverse”, “length”, “width”, “thickness”, “upper”, “lower”, “front”, “rear”, “vertical”, “horizontal”, “top”, “bottom”, “inner”, “outer”, “axial”, “radial”, and “circumferential” should be construed to refer to the orientation as then described or as shown in the drawings under discussion. These relative terms are for convenience and simplification of description of the present disclosure, and do not alone indicate or imply that the device or element referred to must have a particular orientation, and must be constructed or operated in a particular orientation, thus it should not be construed to a limit to the present disclosure.
In addition, terms such as “first”, “second” and “three” are used herein for purposes of description and are not intended to indicate or imply relative importance or significance or to imply the number of indicated technical features. Thus, the feature defined with “first”, “second” and “third” may comprise one or more of this feature. In the description of the present invention, “a plurality of” means two or more than two, unless specified otherwise.
In the present invention, unless specified or limited otherwise, the terms “mounted,” “connected,” “coupled,” “fixed” and the like are used broadly, and may be, for example, fixed connections, detachable connections, or integral connections; may also be mechanical or electrical connections; may also be direct connections or indirect connections via intervening structures; may also be inner communications of two elements, which can be understood by those skilled in the art according to specific situations.
In the present invention, unless specified or limited otherwise, a structure in which a first feature is “on” or “below” a second feature may include an embodiment in which the first feature is in direct contact with the second feature, and may also include an embodiment in which the first feature and the second feature are not in direct contact with each other, but are contacted via an additional feature formed therebetween.
Reference throughout this specification to “an embodiment”, “some embodiments”, “an example”, “a specific example”, or “some examples” means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. Thus, the appearances of the phrases in various places throughout this specification are not necessarily referring to the same embodiment or example of the present disclosure. Furthermore, the particular features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art may combine and compose the different embodiments or examples and features of the different embodiments or examples described in the specification without conflicting situation.
Although explanatory embodiments have been shown and described, it would be understood that the above embodiments are exemplary and cannot be construed to limit the present disclosure, and changes, alternatives, and modifications can be made in the embodiments without departing from the scope of the present disclosure by those skilled in the art.
The present application is a national phase entry under 35 USC §371 of International Application PCT/CN2014/072803, filed Mar. 3, 2014, the entire disclosure of which is incorporated herein by reference.
Filing Document | Filing Date | Country | Kind |
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PCT/CN2014/072803 | 3/3/2014 | WO | 00 |