Pump components, compressors and refrigeration equipment

Abstract

The present invention discloses a pump assembly, a compressor, and a refrigeration device, all relating to the field of compressor technology. The pump assembly comprises a low-pressure compression chamber, an intermediate chamber, and a high-pressure compression chamber. The exhaust port of the low-pressure compression chamber communicates with the high-pressure compression chamber via the intermediate chamber. The intermediate chamber includes at least two cavities connected by a connecting passage. The ratio of the minimum flow area of the connecting passage to the displacement of the low-pressure compression chamber is a, satisfying the requirement that a ≥ 0.75. A reasonable design of the range of a can reduce the flow velocity of the refrigerant within the connecting passage, reduce friction loss and pressure loss of the refrigerant within the connecting passage, and improve the energy efficiency of the compressor.

Description

Technical Field

[0001] The present invention relates to the technical field of compressors, and in particular to a pump assembly, a compressor and a refrigeration device. Background Art

[0002] In related technologies, to improve the performance of compressors in low-temperature heating or high-temperature cooling applications, compressors typically use two-stage or multi-stage compression to compress the refrigerant. This allows the refrigerant to reach a higher pressure, improves the compressor's energy efficiency, and makes the compressor suitable for low-temperature heating or high-temperature cooling applications. However, since a two-stage compression scheme requires the refrigerant to flow from one compression chamber to the next along a connecting channel for compression, significant flow losses occur during the refrigerant flow process, affecting the compressor's energy efficiency. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a pump assembly that can reduce refrigerant flow losses and thereby improve the energy efficiency of the compressor by rationally designing the displacement ratio between the communication channel and the compression chamber.

[0004] The present invention also provides a compressor and a refrigeration device having the pump body assembly.

[0005] According to an embodiment of the first aspect of the present invention, the pump body assembly includes: a low-pressure compression chamber, an intermediate chamber and a high-pressure compression chamber, the exhaust port of the low-pressure compression chamber is connected to the air inlet of the high-pressure compression chamber through the intermediate chamber, the intermediate chamber includes at least two cavities and a connecting channel connecting two adjacent cavities, the minimum flow area of the connecting channel and the displacement ratio of the low-pressure compression chamber is a, satisfying: a≥0.75.

[0006] The pump assembly according to the embodiment of the present invention has at least the following beneficial effects:

[0007] The exhaust port of the low-pressure compression chamber of the pump assembly is connected to the high-pressure compression chamber through the intermediate chamber. Therefore, after being compressed in the low-pressure compression chamber, the refrigerant enters the high-pressure compression chamber through the intermediate chamber and is compressed again, which can increase the pressure of the refrigerant, allowing the compressor to achieve better results in low-temperature heating or high-temperature cooling. The intermediate chamber includes at least two cavities connected by a connecting channel. The ratio of the minimum flow area of the connecting channel to the displacement of the low-pressure compression chamber is a, satisfying: a ≥ 0.75. If a is less than 0.75, the flow area of the connecting channel is too small, the flow velocity of the refrigerant increases, the friction between the refrigerant and the wall of the connecting channel increases, and the friction loss increases; when the connecting channel suddenly turns, the refrigerant with a higher flow rate will directly impact the wall of the connecting channel, resulting in increased pressure loss. Therefore, a reasonable design of the relationship between the minimum flow area of the connecting channel and the displacement ratio of the low-pressure compression chamber can reduce the flow velocity of the refrigerant in the connecting channel, reduce friction loss and pressure loss, thereby reducing the flow loss of the refrigerant and improving the energy efficiency of the compressor.

[0008] According to some embodiments of the present invention, a ratio of a minimum flow area of the communicating channel to a displacement of the high-pressure compression chamber is b, and satisfies: b≥1.95.

[0009] According to some embodiments of the present invention, a ratio of the minimum flow area of the communicating channel to the total volume of the intermediate cavity is c, which satisfies: 6.8≥c≥0.15.

[0010] According to some embodiments of the present invention, the pump body assembly includes an upper bearing, a second cylinder, a partition member, a first cylinder and a lower bearing connected in sequence, and the first cavity of the intermediate cavity is formed in the partition member.

[0011] According to some embodiments of the present invention, the partition member includes an upper partition and a lower partition that are fixedly connected, the upper partition is fixedly connected to the lower end surface of the second cylinder, and the lower partition is fixedly connected to the upper end surface of the first cylinder, and is provided with a first valve seat located in the first cavity, and the first valve seat is provided with an exhaust port of the low-pressure compression cavity.

[0012] According to some embodiments of the present invention, a groove is provided on a side of the upper partition plate facing the lower partition plate, and the first cavity is enclosed by a wall surface of the groove and a wall surface of the lower partition plate facing the upper partition plate.

[0013] According to some embodiments of the present invention, the pump body assembly also includes a lower muffler connected to the lower bearing, the lower bearing is provided with a second valve seat, the second valve seat is provided with an exhaust port of the low-pressure compression chamber, the lower muffler and the lower bearing enclose a second cavity of the intermediate cavity, and the second cavity and the first cavity are connected through the connecting channel.

[0014] According to some embodiments of the present invention, a plurality of low-pressure compression chambers are provided, and exhaust ports of the plurality of low-pressure compression chambers are all connected to the intermediate chamber.

[0015] According to some embodiments of the present invention, a plurality of high-pressure compression chambers are provided, and the air inlets of the plurality of high-pressure compression chambers are all connected to the intermediate chamber.

[0016] The compressor according to the second embodiment of the present invention includes the pump body assembly described in the above embodiment.

[0017] The compressor according to the embodiment of the present invention has at least the following beneficial effects:

[0018] In the pump assembly of the first embodiment, the exhaust port of the low-pressure compression chamber of the pump assembly is connected to the high-pressure compression chamber through the intermediate chamber. Therefore, after the refrigerant is compressed in the low-pressure compression chamber, it enters the high-pressure compression chamber through the intermediate chamber and is compressed again, which can increase the pressure of the refrigerant, so that the compressor can achieve better results in low-temperature heating or high-temperature cooling. The intermediate chamber includes at least two cavities connected by a connecting channel. The ratio of the minimum flow area of the connecting channel to the displacement of the low-pressure compression chamber is a, satisfying: a ≥ 0.75. If a is less than 0.75, the flow area of the connecting channel is too small, the flow velocity of the refrigerant increases, the friction between the refrigerant and the wall of the connecting channel increases, and friction loss increases. When the connecting channel suddenly turns, the refrigerant with a higher flow rate will directly impact the wall of the connecting channel, resulting in increased pressure loss. Therefore, a reasonable design of the relationship between the minimum flow area of the connecting channel and the displacement ratio of the low-pressure compression chamber can reduce the flow velocity of the refrigerant in the connecting channel, reduce friction loss and pressure loss, thereby reducing the flow loss of the refrigerant and improving the energy efficiency of the compressor.

[0019] The refrigeration equipment according to the third embodiment of the present invention includes the compressor described in the above embodiment.

[0020] The refrigeration equipment according to the embodiment of the present invention has at least the following beneficial effects:

[0021] In the compressor of the second embodiment, the exhaust port of the low-pressure compression chamber of the compressor is connected to the high-pressure compression chamber through the intermediate chamber. Therefore, after the refrigerant is compressed in the low-pressure compression chamber, it enters the high-pressure compression chamber through the intermediate chamber and is compressed again, which can increase the pressure of the refrigerant, so that the compressor can also achieve better results in low-temperature heating or high-temperature cooling. The intermediate chamber includes at least two cavities connected by a connecting channel. The ratio of the minimum flow area of the connecting channel to the displacement of the low-pressure compression chamber is a, satisfying: a≥0.75. If a is less than 0.75, the flow area of the connecting channel is too small, the flow velocity of the refrigerant increases, the friction between the refrigerant and the wall of the connecting channel increases, and the friction loss increases; when the connecting channel suddenly turns, the refrigerant with a higher flow rate will directly impact the wall of the connecting channel, resulting in increased pressure loss. Therefore, a reasonable design of the relationship between the minimum flow area of the connecting channel and the displacement ratio of the low-pressure compression chamber can reduce the flow velocity of the refrigerant in the connecting channel, reduce friction loss and pressure loss, thereby reducing the flow loss of the refrigerant and improving the energy efficiency of the compressor.

[0022] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0024] Figure 1 A schematic cross-sectional view of a compressor according to an embodiment of the present invention;

[0025] Figure 2 A schematic cross-sectional view of a pump assembly according to an embodiment of the present invention;

[0026] Figure 3 This is a schematic structural diagram of a compressor according to an embodiment of the present invention;

[0027] Figure 4 is a schematic cross-sectional view of a compressor according to another embodiment of the present invention;

[0028] Figure 5 is a schematic cross-sectional view of a compressor according to another embodiment of the present invention;

[0029] Figure 6 This is a diagram showing the relationship between a, b, c and the COP of the compressor according to an embodiment of the present invention.

[0030] Figure Number:

[0031] Compressor 1000;

[0032] Pump assembly 100; first cylinder 110; low-pressure compression chamber 111; lower bearing 120; lower muffler 130; second chamber 131; communication channel 140; upper bearing 150; second cylinder 160; high-pressure compression chamber 161; upper muffler 170; third chamber 171; partition member 190; first chamber 191; upper partition 192; lower partition 193; intermediate chamber 194;

[0033] Housing 200; inner cavity 210; air outlet pipe 220;

[0034] Liquid reservoir 300; exhaust pipe 310;

[0035] Motor assembly 400; stator 410; rotor 420; crankshaft 430; first piston 431; second piston 432;

[0036] a first enthalpy increasing component 500;

[0037] The second enthalpy increasing component 600 . DETAILED DESCRIPTION

[0038] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0039] In the description of the present invention, it should be understood that descriptions involving orientation, such as the orientation or positional relationship indicated by up, down, etc., are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0040] In the description of the present invention, "a plurality" refers to more than two. The use of "first" or "second" is solely for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of the indicated technical features, or implicitly indicating the order of the indicated technical features.

[0041] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0042] Compressors can be used in refrigeration or heating equipment, such as heat pump water heaters and air conditioners. Compressors compress low-temperature, low-pressure refrigerant into high-temperature, high-pressure refrigerant, powering the refrigeration system's circulation. When heating in a low-temperature environment or cooling in a high-temperature environment, the temperature difference between the outdoor heat exchanger and the ambient temperature decreases, significantly reducing the compressor's cooling or heating capacity for the same workload. To this end, compressors can use a multi-stage compression method to compress the refrigerant. Multi-stage compression can give the compressor a higher volumetric efficiency and increase the refrigerant pressure discharged from the pump assembly, allowing the compressor to achieve better results in low-temperature heating and high-temperature cooling applications.

[0043] For example, refer to Figure 1 、 Figure 2 and Figure 3 As shown, a compressor 1000 according to an embodiment of the present invention includes a housing 200, a pump assembly 100, a motor assembly 400, and a liquid reservoir 300. The housing 200 has an inner cavity 210, and an exhaust pipe 220 is provided at the upper end of the housing 200 for exhausting gas. The pump assembly 100 is mounted within the inner cavity 210, and the liquid reservoir 300 is located outside the housing 200 and connected to the pump assembly 100 via the exhaust pipe 310. The motor assembly 400 includes a stator 410 and a rotor 420. The stator 410 is fixedly connected to the inner wall of the housing 200, and the rotor 420 is located between the stators 410.

[0044] Reference Figure 2As shown, the pump body assembly 100 includes a lower bearing 120, a first cylinder 110, a partition member 190, a second cylinder 160, an upper bearing 150, and a crankshaft 430. The motor assembly 400 is capable of driving the crankshaft 430 to rotate. Along the axial direction of the crankshaft 430, the crankshaft 430 includes a first eccentric portion and a second eccentric portion spaced apart from each other. The first eccentric portion is fitted with a first piston 431, and the second eccentric portion is fitted with a second piston 432. The lower bearing 120 is connected to the lower end surface of the first cylinder 110. The first cylinder 110 forms a low-pressure compression chamber 111. The first piston 431 is rotatably disposed within the low-pressure compression chamber 111. The liquid reservoir 300 is connected to the first cylinder 110. A partition member 190 is disposed on the side of the first cylinder 110 facing away from the lower bearing 120, and the second cylinder 160 is connected to the side of the partition member 190 facing away from the first cylinder 110. The partition member 190 serves to separate the first cylinder 110 from the second cylinder 160. The second cylinder 160 forms a high-pressure compression chamber 161, and the second piston 432 is rotatably disposed within the high-pressure compression chamber 161. The pump body assembly 100 is provided with an intermediate chamber 194, through which the exhaust port of the low-pressure compression chamber 111 communicates with the intake port of the high-pressure compression chamber 161. The upper bearing 150 is connected to the upper end surface of the second cylinder 160, and the crankshaft 430 is inserted through the upper bearing 150 and the lower bearing 120 to reduce friction during rotation of the crankshaft 430 and ensure stable operation of the crankshaft 430.

[0045] Therefore, when the compressor 1000 is working, low-temperature and low-pressure refrigerant enters the liquid reservoir 300. The liquid reservoir 300 can reduce the amount of liquid refrigerant entering the interior of the pump body assembly 100 to avoid liquid hammer. The gaseous refrigerant enters the low-pressure compression chamber 111 through the exhaust pipe 310 of the liquid reservoir 300. When the crankshaft 430 rotates, it drives the first piston 431 to rotate in the low-pressure compression chamber 111, thereby performing a first-stage compression on the low-temperature and low-pressure refrigerant. The refrigerant is then discharged into the intermediate chamber 194 through the exhaust port of the low-pressure compression chamber 111. The refrigerant then enters the high-pressure compression chamber 161 through the intermediate chamber 194 for a second-stage compression, and finally enters the inner chamber 210 of the shell 200. After being further heated by the stator 410 and the rotor 420, it becomes a high-temperature and high-pressure refrigerant, and is finally discharged from the outlet pipe 220 of the shell 200. By adopting a two-stage compression method, the pressure of the refrigerant can be increased. After the initial pressure of the refrigerant after the first-stage compression is increased to a certain level, the workload required for the second-stage compression is reduced. Therefore, the energy efficiency of the compressor 1000 can be improved, so that the compressor 1000 can also achieve better results in low-temperature heating and high-temperature cooling situations.

[0046] Because the displacement of the low-pressure compression chamber is usually larger than that of the high-pressure compression chamber, the low-pressure compression chamber can be exhausted to the two end surfaces and then mixed into the high-pressure compression chamber. In other words, the low-pressure compression chamber can be exhausted to at least two cavities in the middle chamber, and the cavities are connected by a connecting channel. However, when the refrigerant flows through the connecting channel, the flow loss is large, affecting the energy efficiency of the compressor.

[0047] In order to improve the problem of large refrigerant flow loss, refer to Figure 2 As shown, a pump body assembly 100 according to an embodiment of the present invention is provided with a low-pressure compression chamber 111, an intermediate chamber 194 and a high-pressure compression chamber 161. The exhaust port of the low-pressure compression chamber 111 is connected to the air inlet of the high-pressure compression chamber 161 through the intermediate chamber 194. The intermediate chamber 194 includes at least two cavities and a connecting channel 140 connecting two adjacent cavities. The minimum flow area of the connecting channel 140 and the displacement ratio of the low-pressure compression chamber 111 are a, which satisfies: a ≥ 0.75, for example, a = 1, a = 2, a = 3, a = 5, a = 6.8. Figure 6 As shown in the figure, the horizontal axis represents the size of a, and the vertical axis represents the COP of the compressor. It should be noted that, when cooling, COP refers to the ratio of the cooling capacity of the compressor 1000 to the input power; when heating, it is the COP during cooling + 1. The higher the COP value, the higher the efficiency of the compressor 1000, and the more power it saves. If a is less than 0.75, the flow area of the connecting channel 140 is too small, the flow velocity of the refrigerant increases, the square of the flow velocity and the loss are positively correlated, and the friction between the refrigerant and the wall of the connecting channel 140 increases, resulting in increased friction loss; and the connecting channel 140 undergoes a sudden change, for example, when the connecting channel 140 suddenly turns, the refrigerant with a higher flow rate will directly hit the wall of the connecting channel 140, resulting in an increase in pressure loss. As a gradually increases, the COP first increases and then decreases. Therefore, a reasonable design of the minimum flow area of the connecting channel 140 and the displacement ratio of the low-pressure compression chamber 111 can reduce the flow velocity of the refrigerant in the connecting channel 140, reduce friction loss and pressure loss, thereby reducing the flow loss of the refrigerant and improving the energy efficiency of the compressor 1000.

[0048] It should be noted that the unit of minimum flow area is mm 2 The unit of displacement is cc, and the unit of volume is ml. In all subsequent embodiments, unless otherwise specified, the units of minimum flow area, displacement and volume are the above units.

[0049] In the embodiment of the present invention, the ratio of the minimum flow area of the communication channel 140 to the displacement of the high-pressure compression chamber 161 is b, which satisfies b≥1.95, for example, b=2.7, b=5, b=10, b=17. It can be understood that since the displacement of the high-pressure compression chamber 161 is generally smaller than that of the low-pressure compression chamber 111, the minimum value of b is greater than the minimum value of a. Figure 6 As shown in the figure, the horizontal axis represents the size of b, and the vertical axis represents the COP of the compressor. When b is less than 1.95, the flow area of the connecting channel 140 is too small, the flow velocity of the refrigerant increases, and the friction between the refrigerant and the wall of the connecting channel 140 increases, resulting in an increase in friction loss; and the connecting channel 140 undergoes a sudden change, for example, when the connecting channel 140 suddenly turns, the refrigerant with a higher flow rate will directly hit the wall of the connecting channel 140, resulting in an increase in pressure loss. As b gradually increases, the COP first increases and then decreases. Therefore, a reasonable design of the relationship between the minimum flow area of the connecting channel 140 and the displacement ratio of the low-pressure compression chamber 111 can reduce the flow velocity of the refrigerant in the connecting channel 140, reduce friction loss and pressure loss, thereby reducing the flow loss of the refrigerant and improving the energy efficiency of the compressor 1000.

[0050] In the embodiment of the present invention, the ratio of the minimum flow area of the communication channel 140 to the total volume of the intermediate cavity 194 is c, which satisfies 6.8≥c≥0.15, for example, c=0.2, c=2, c=4, c=6.8. Figure 6 As shown in the figure, the abscissa represents the magnitude of c, and the ordinate represents the COP of the compressor. As c gradually increases, the COP first increases and then decreases. If c is less than 0.15, the minimum flow area of the connecting channel 140 is too small or the total volume of the intermediate cavity 194 is too large. When the minimum flow area of the connecting channel 140 is too small, the refrigerant flow resistance increases, and it takes longer to fill the intermediate cavity 194, resulting in a decrease in the exhaust capacity of the low-pressure compression chamber 111 and a reduction in the volumetric efficiency of the compressor 1000. When the total volume of the intermediate cavity 194 is too large, the total volume of the pump assembly 100 is increased, and more refrigerant is required to fill the intermediate cavity 194. As a result, it takes longer for the low-pressure compression chamber 111 to discharge sufficient gas into the intermediate cavity 194. The refrigerant also spends more time in the intermediate cavity 194, making it more likely for the refrigerant to exchange heat with the high-temperature lubricating oil outside the pump assembly 100, causing it to heat up. This in turn increases the input required to compress the refrigerant in the high-pressure compression chamber 161, reducing the overall efficiency of the compressor 1000.

[0051] If c is greater than 6.8, the minimum flow area of the communication channel 140 is too large or the total volume of the intermediate cavity 194 is too small. When the minimum flow area of the communication channel 140 is too large, the volume of the pump assembly 100 increases, which has a greater impact on the overall size of the compressor 1000. When the total volume of the intermediate cavity 194 is too small, the refrigerant that the intermediate cavity 194 can accommodate is limited, resulting in the low-pressure compression chamber 111 needing to frequently vent to the intermediate cavity 194 to meet the needs of the high-pressure compression chamber 161. Frequent venting increases the workload and energy efficiency of the compressor 1000.

[0052] Therefore, by rationally designing the range of the ratio of the minimum flow area of the connecting channel 140 to the total volume of the intermediate cavity 194, the pump body assembly 100 has a compact structure, which can reduce the resistance to the flow of the refrigerant, reduce the time the refrigerant stays in the intermediate cavity 194, and reduce the temperature rise of the refrigerant in the intermediate cavity 194 to reduce the input force required for the high-pressure compression chamber 161, thereby improving the volumetric efficiency of the compressor 1000.

[0053] Reference Figure 2 As shown, in an embodiment of the present invention, the intermediate cavity 194 includes a first cavity 191 and a second cavity 131, and the first cavity 191 is formed in the partition member 190. The pump body assembly 100 also includes a lower muffler 130, which is connected to the lower bearing 120. A second cavity 131 is formed between the lower muffler 130 and the lower bearing 120, and the second cavity 131 and the first cavity 191 are connected through a connecting channel 140. The low-pressure compression chamber 111 can discharge the refrigerant to the second cavity 131, and then enter the first cavity 191 through the connecting channel 140. Alternatively, the low-pressure compression chamber 111 discharges the refrigerant to the first cavity 191 and the second cavity 131 at the same time to improve the exhaust efficiency.

[0054] Continue to refer to Figure 2 As shown, in an embodiment of the present invention, the partition member 190 includes an upper partition 192 and a lower partition 193, with the upper partition 192 fixedly connected to the lower partition 193. The upper partition 192 is also fixedly connected to the lower end surface of the second cylinder 160, and the lower partition 193 is fixedly connected to the upper end surface of the first cylinder 110. The upper partition 192 is provided with a groove on the side facing the lower partition 193, and the wall surface of the groove and the wall surface of the lower partition 193 on the side facing the upper partition 192 enclose a first cavity 191. The lower partition 193 is provided with a first valve seat, and the first valve seat is provided with an exhaust port for the low-pressure compression chamber 111, so that the low-pressure compression chamber 111 can discharge refrigerant into the first cavity 191 through the first valve seat.

[0055] In an embodiment of the present invention, the lower bearing 120 is provided with a second valve seat, and the second valve seat is provided with an exhaust port of the low-pressure compression chamber 111, that is, the low-pressure compression chamber 111 is provided with two exhaust ports, so that the refrigerant in the low-pressure compression chamber 111 enters the first cavity 191 and the second cavity 131 respectively through the two exhaust ports after compression, which can improve the exhaust efficiency.

[0056] Reference Figure 4As shown, in the embodiment of the present invention, the pump body assembly 100 further includes an upper muffler 170, which is connected to the upper bearing 150, and a third cavity 171 is formed between the upper muffler 170 and the upper bearing 150. The high-pressure compression chamber 161 can discharge the compressed refrigerant into the third cavity 171, and finally enter the inner cavity 210 of the shell 200. The provision of the upper muffler 170 can reduce the noise when the refrigerant is discharged, thereby improving the user experience.

[0057] In order to increase the displacement of the compressor 1000, so as to enhance the cooling capacity of the compressor 1000 in a high temperature environment or the heating capacity in a low temperature environment, refer to Figure 4 As shown, in the embodiment of the present invention, the compressor 1000 further includes a first enthalpy increasing assembly 500, which is in communication with the intermediate cavity 194. The first enthalpy increasing assembly 500 serves to replenish air and can deliver refrigerant into the intermediate cavity 194. By mixing with the refrigerant already in the intermediate cavity 194, the refrigerant is cooled, thereby reducing the input force required by the high-pressure compression chamber 161 when compressing the refrigerant.

[0058] Reference Figure 5 As shown, in an embodiment of the present invention, the compressor 1000 further includes a second enthalpy increasing component 600, which is connected to the low-pressure compression chamber 111 through the first channel, thereby transporting refrigerant into the low-pressure compression chamber 111 to increase the exhaust volume of the low-pressure compression chamber 111. In another embodiment of the present invention, the second enthalpy increasing component 600 may also be connected to the high-pressure compression chamber 161, and the second enthalpy increasing component 600 is used to transport refrigerant into the high-pressure compression chamber 161 to increase the exhaust volume of the high-pressure compression chamber 161, thereby improving the low-temperature heating or high-temperature cooling capabilities of the compressor 1000.

[0059] In an embodiment of the present invention, the gaseous refrigerant used to replenish the gas in the first enthalpy increasing component 500 can be provided by a flash evaporator, which is arranged in the circulation loop of the refrigeration system or the heating system. Taking the heating system as an example: after the liquid refrigerant releases heat through the condenser, it flows through the first throttling device. Under the action of the first throttling device, it changes from a fully liquid refrigerant to a gas-liquid mixed refrigerant. The gas-liquid mixed refrigerant then enters the flash evaporator. The gaseous refrigerant flows along the gas outlet of the flash evaporator to the first enthalpy increasing component 500. The liquid refrigerant flows out from the liquid outlet of the flash evaporator and enters the evaporator after passing through the second throttling device. Finally, the refrigerant after absorbing heat passes through the liquid reservoir 300 and enters the low-pressure compression chamber 111. The refrigerant used to replenish the gas in the second enthalpy increasing component 600 can also be provided by a flash evaporator, that is, the refrigeration system or the heating system can be provided with two flash evaporators, which respectively transport gaseous refrigerant to the first enthalpy increasing component 500 and the second enthalpy increasing component 600. In another embodiment of the present invention, the flash evaporator can be replaced by a plate heat exchanger, that is, the refrigerant used for the first enthalpy increase component 500 and the second enthalpy increase component 600 to replenish the air can also be provided by the plate heat exchanger. The appropriate solution can be selected according to the actual situation.

[0060] In an embodiment of the present invention, a plurality of low-pressure compression chambers 111 are provided, and the exhaust ports of the plurality of low-pressure compression chambers 111 are all connected to the intermediate chamber 194. For example, the plurality of low-pressure compression chambers 111 are arranged sequentially in the vertical direction. In an embodiment of the present invention, a plurality of high-pressure compression chambers 161 may also be provided, and the air inlets of the plurality of high-pressure compression chambers 161 are all connected to the intermediate chamber 194, and the plurality of high-pressure compression chambers 161 are arranged sequentially in the vertical direction. It is understood that providing a plurality of low-pressure compression chambers 111 or a plurality of high-pressure compression chambers 161 can improve the compression efficiency of the refrigerant.

[0061] A compressor 1000 according to an embodiment of the present invention includes the pump body assembly 100 of the above embodiment. The compressor 1000 can be used in refrigeration equipment, such as a heat pump water heater, an integral air conditioner, a split air conditioner, a duct air conditioner, a window air conditioner, and the like. By adopting the pump body assembly 100 of the above embodiment, the exhaust port of the low-pressure compression chamber 111 of the pump body assembly 100 is connected to the high-pressure compression chamber 161 through the intermediate chamber 194. Therefore, after the refrigerant is compressed in the low-pressure compression chamber 111, it enters the high-pressure compression chamber 161 through the intermediate chamber 194 and is compressed again. This can increase the pressure of the refrigerant, so that the compressor 1000 can also achieve better results in low-temperature heating or high-temperature cooling situations. The intermediate cavity 194 includes at least two cavities connected by a connecting passage 140. The ratio of the minimum flow area of the connecting passage 140 to the displacement of the low-pressure compression chamber 111 is a, and satisfies the following: a ≥ 0.75. If a is less than 0.75, the flow area of the connecting passage 140 is too small, the flow velocity of the refrigerant increases, the friction between the refrigerant and the wall of the connecting passage 140 increases, and the friction loss increases. If the connecting passage 140 undergoes a sudden change, such as when the connecting passage 140 suddenly turns, the refrigerant with a higher flow velocity will directly impact the wall of the connecting passage 140, resulting in increased pressure loss. Therefore, a reasonable design of the relationship between the minimum flow area of the connecting passage 140 and the displacement ratio of the low-pressure compression chamber 111 can reduce the flow velocity of the refrigerant in the connecting passage 140, reduce friction loss and pressure loss, thereby reducing the flow loss of the refrigerant and improving the energy efficiency of the compressor 1000.

[0062] Since the compressor 1000 adopts all the technical solutions of the pump body assembly 100 of the above embodiment, it has at least all the beneficial effects brought by the technical solutions of the above embodiment, which will not be repeated here.

[0063] A refrigeration device according to one embodiment of the present invention includes the compressor 1000 of the above-described embodiment. The refrigeration device may be a heat pump water heater, a packaged air conditioner, a split air conditioner, a ducted air conditioner, a window air conditioner, or the like. By employing the compressor 1000 of the above-described embodiment, the compressor 1000 can compress the refrigerant to increase the temperature and pressure of the refrigerant, thereby providing power for the circulation of the refrigeration system.

[0064] Since the refrigeration device adopts all the technical solutions of the compressor 1000 of the above embodiment, it has at least all the beneficial effects brought by the technical solutions of the above embodiment, which will not be described in detail here.

[0065] The embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the knowledge of ordinary technicians in the relevant technical field without departing from the scope of the present invention.

Claims

1. Pump body assembly, characterized in that, The pump body assembly includes an upper bearing, a second cylinder, a partition, a first cylinder and a lower bearing connected in sequence. The pump body assembly is provided with a low-pressure compression chamber, an intermediate chamber and a high-pressure compression chamber. The first cylinder forms the low-pressure compression chamber, the second cylinder forms the high-pressure compression chamber, the exhaust port of the low-pressure compression chamber is connected to the air inlet of the high-pressure compression chamber through the intermediate chamber, the intermediate chamber includes at least two chambers and a connecting channel connecting two adjacent chambers, the first chamber of the intermediate chamber is formed in the partition, the pump body assembly also includes a lower muffler connected to the lower bearing, the The lower bearing is provided with a second valve seat, and the second valve seat is provided with an exhaust port of the low-pressure compression chamber. The lower muffler and the lower bearing enclose a second cavity of the intermediate cavity. The second cavity and the first cavity are connected through the connecting channel. The ratio of the minimum flow area of the connecting channel to the displacement of the low-pressure compression chamber is a, satisfying: a≥0.75, the ratio of the minimum flow area of the connecting channel to the displacement of the high-pressure compression chamber is b, satisfying: b≥1.95, and the ratio of the minimum flow area of the connecting channel to the total volume of the intermediate cavity is c, satisfying: 6.8≥c≥0.

15.

2. The pump assembly according to claim 1, characterized in that: The partition member includes an upper partition and a lower partition that are fixedly connected. The upper partition is fixedly connected to the lower end surface of the second cylinder, and the lower partition is fixedly connected to the upper end surface of the first cylinder. A first valve seat is provided in the first cavity, and the first valve seat is provided with an exhaust port of the low-pressure compression cavity.

3. The pump assembly according to claim 2, characterized in that: A groove is provided on a side of the upper partition plate facing the lower partition plate, and the first cavity is enclosed by a wall surface of the groove and a wall surface of the lower partition plate facing the upper partition plate.

4. The pump assembly according to claim 1, characterized in that: There are multiple low-pressure compression chambers, and the exhaust ports of the multiple low-pressure compression chambers are all connected to the middle chamber.

5. The pump assembly according to claim 1, characterized in that: There are multiple high-pressure compression chambers, and the air inlets of the multiple high-pressure compression chambers are all connected to the intermediate chamber.

6. A compressor, characterized in that The pump body assembly comprises the pump body assembly according to any one of claims 1 to 5.

7. Refrigeration equipment, characterized in that Including the compressor according to claim 6.

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