Pump body assembly, compressor and refrigeration equipment

Abstract

The pump body assembly comprises a first compression assembly, a second compression assembly and a partition plate assembly, the first compression assembly is provided with a low-pressure compression cavity, a first cavity and a communication channel, and an exhaust port of the low-pressure compression cavity is communicated with the communication channel through the first cavity. The minimum through-flow area of the communicating channel is S1, the second compression assembly is provided with a high-pressure compression cavity, the partition plate assembly is connected between the first compression assembly and the second compression assembly and provided with a second cavity, and an air suction port of the high-pressure compression cavity communicates with the communicating channel through the second cavity. The minimum cross sectional area of the second cavity is S2, and S2 / S1 is larger than or equal to 0.45 and smaller than or equal to 3, so that the deflection of the crankshaft can be reduced while the flow loss of a refrigerant is reduced, and the performance of the compressor is improved.

Description

Technical Field

[0001] This utility model relates to the field of compressor technology, and in particular to a pump body assembly, a compressor and a refrigeration device. Background Technology

[0002] Currently, pump assemblies employ multi-stage compression technology to distribute the pressure ratio of each stage, keeping the compression components within a more reasonable pressure ratio range and thus improving the compressor's volumetric efficiency. Existing pump assemblies include a first cylinder, a second cylinder, and a partition assembly located between the first and second cylinders. The first cylinder has a low-pressure compression chamber, and the second cylinder has a high-pressure compression chamber. To reduce refrigerant flow loss, a cavity connecting the low-pressure and high-pressure compression chambers is typically provided on the partition assembly. However, this method of providing a cavity on the partition assembly results in an excessively large distance between the first and second cylinders, affecting the compressor's mechanical efficiency and performance. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a pump body assembly that can reduce intake and exhaust pulsation and improve compressor performance.

[0004] This utility model also proposes a compressor having the above-mentioned pump body assembly.

[0005] This utility model also proposes a refrigeration device having the above-mentioned compressor.

[0006] The pump body assembly according to a first aspect embodiment of the present invention includes:

[0007] The first compression assembly includes a low-pressure compression chamber, a first cavity, and a connecting channel. The exhaust port of the low-pressure compression chamber is connected to the connecting channel through the first cavity. The minimum flow area of ​​the connecting channel is S1.

[0008] The second compression assembly is equipped with a high-pressure compression chamber;

[0009] A partition assembly is connected between the first compression assembly and the second compression assembly. The partition assembly has a second cavity. The air intake of the high-pressure compression cavity is connected to the communication channel through the second cavity. On the cross-section of the axis of the pump body assembly, the minimum cross-sectional area of ​​the second cavity is S2, which satisfies: 0.45≤S2 / S1≤3.

[0010] The pump assembly according to the embodiments of the present invention has at least the following beneficial effects:

[0011] When the pump assembly is working, refrigerant from outside the pump assembly is drawn into the low-pressure compression chamber through the intake port. The refrigerant completes primary compression in the low-pressure compression chamber. Afterward, the refrigerant is discharged into the first chamber through the exhaust port of the low-pressure compression chamber. The refrigerant in the first chamber flows into the second chamber through the connecting channel. The refrigerant in the second chamber is drawn into the high-pressure compression chamber through the intake port. The refrigerant completes secondary compression in the high-pressure compression chamber. On the one hand, the low-pressure and high-pressure compression chambers are within a reasonable pressure ratio range, which can improve the volumetric efficiency of the compressor. On the other hand, it can effectively reduce the intake and exhaust pulsations of the pump assembly, thereby improving the performance of the compressor. Since the minimum flow area of ​​the connecting channel is S1, the minimum cross-sectional area of ​​the second cavity on the cross-section of the axis O1 passing through the pump body assembly is S2, satisfying the condition: 0.45 ≤ S2 / S1 ≤ 3. When S2 / S1 is less than 0.45, the minimum flow area of ​​the connecting channel is too small, resulting in large refrigerant flow loss and insufficient pressure of the refrigerant discharged from the high-pressure compression chamber, which is detrimental to improving compressor performance. When S2 / S1 is greater than 3, the minimum cross-sectional area of ​​the second cavity on the cross-section of the axis O1 passing through the pump body assembly is too large, resulting in excessive spacing between the first and second compression assemblies. During compressor operation, the crankshaft deflection increases, making it prone to bending and deformation, leading to increased crankshaft wear, reduced compressor mechanical efficiency, and decreased compressor performance. Therefore, rationally designing the relationship between the minimum flow area of ​​the connecting channel and the minimum cross-sectional area of ​​the second cavity on the cross-section of the axis O1 passing through the pump body assembly can reduce refrigerant flow loss while decreasing crankshaft deflection, thereby improving compressor performance.

[0012] According to some embodiments of this utility model, the ratio of the displacement of the high-pressure compression chamber to the displacement of the low-pressure compression chamber is V. P Satisfying: 0.4 ≤ V P ≤0.8.

[0013] According to some embodiments of the present invention, the first compression component is provided with an enthalpy injection hole that connects to the communication channel, and the enthalpy injection hole is used to supply refrigerant to the second cavity by the enthalpy enhancement component.

[0014] According to some embodiments of this utility model, the minimum diameter of the spray enthalpy orifice is D1, and the minimum diameter of the connecting channel is D2, satisfying: D1 / D2≥0.5.

[0015] According to some embodiments of this utility model, the angle between the center of the air intake of the low-pressure compression chamber and the center of the enthalpy injection hole corresponding to the axis of the pump body assembly is θ, which satisfies: θ≤90°.

[0016] According to some embodiments of the present invention, the first compression assembly includes a first cylinder, a lower bearing, and a lower muffler. The low-pressure compression chamber, the connecting channel, and the injection enthalpy hole are respectively located in the first cylinder. The lower bearing and the lower muffler are both connected to the first cylinder. The lower bearing and the lower muffler enclose each other to form the first cavity. The partition assembly is located on the side of the first cylinder away from the lower bearing.

[0017] According to some embodiments of the present invention, the second compression assembly includes a second cylinder, an upper bearing, and an upper muffler. The high-pressure compression chamber is located inside the second cylinder. The upper bearing and the upper muffler are both connected to the second cylinder. The partition assembly is located on the side of the second cylinder away from the upper bearing.

[0018] According to some embodiments of the present invention, the baffle assembly includes a first baffle and a second baffle disposed opposite to each other along the axial direction of the pump body assembly, the first baffle and the second baffle enclosing the second cavity, the first baffle being connected to the first compression assembly, and the second baffle being connected to the second compression assembly.

[0019] According to some embodiments of the present invention, multiple connecting channels are configured, and the multiple connecting channels are spaced apart around the axis of the pump body assembly, with each connecting channel connecting the first cavity and the second cavity at both ends respectively.

[0020] The compressor according to a second aspect of the present invention includes the pump assembly described in the above embodiments.

[0021] The compressor according to the second aspect embodiment of the present invention has at least the following beneficial effects:

[0022] When the compressor operates using the pump assembly of the first aspect of this utility model, refrigerant outside the pump assembly is drawn into the low-pressure compression chamber from the intake port. The refrigerant completes primary compression in the low-pressure compression chamber. Then, the refrigerant is discharged into the first chamber through the exhaust port of the low-pressure compression chamber. The refrigerant in the first chamber flows into the second chamber through the connecting channel. The refrigerant in the second chamber is drawn into the high-pressure compression chamber from the intake port. The refrigerant completes secondary compression in the high-pressure compression chamber. On the one hand, the low-pressure compression chamber and the high-pressure compression chamber are within a reasonable pressure ratio range, which can improve the volumetric efficiency of the compressor. On the other hand, it can effectively reduce the intake pulsation and exhaust pulsation of the pump assembly, thereby improving the performance of the compressor. Since the minimum flow area of ​​the connecting channel is S1, the minimum cross-sectional area of ​​the second cavity on the cross-section through the axis of the pump body assembly is S2, satisfying 0.45≤S2 / S1≤3. When S2 / S1 is less than 0.45, the minimum flow area of ​​the connecting channel is too small, resulting in large refrigerant flow loss and insufficient pressure of the refrigerant discharged from the high-pressure compression chamber, which is detrimental to improving compressor performance. When S2 / S1 is greater than 3, the minimum cross-sectional area of ​​the second cavity on the cross-section through the axis of the pump body assembly is too large, resulting in excessive spacing between the first and second compression assemblies. During compressor operation, the crankshaft deflection increases, making it prone to bending and deformation, leading to increased crankshaft wear, reduced compressor mechanical efficiency, and decreased compressor performance. Therefore, rationally designing the relationship between the minimum flow area of ​​the connecting channel and the minimum cross-sectional area of ​​the second cavity on the cross-section through the axis of the pump body assembly can reduce refrigerant flow loss while decreasing crankshaft deflection, thereby improving compressor performance.

[0023] The refrigeration equipment according to a third aspect of the present invention includes the compressor described in the above embodiments.

[0024] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0025] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0026] Figure 1 This is a cross-sectional schematic diagram of a pump body assembly according to an embodiment of the present invention;

[0027] Figure 2 This is a cross-sectional schematic diagram of a compressor according to an embodiment of the present invention;

[0028] Figure 3 for Figure 2 Sectional view of line AA in the middle;

[0029] Figure 4 This is a graph showing the relationship between the ratio of the minimum flow area of ​​the connecting channel and the minimum cross-sectional area of ​​the second cavity on the cross-section of the pump body assembly, according to one embodiment of the present invention, and the compressor COP.

[0030] Icon labels:

[0031] Axis O1, first cylinder 101, lower bearing 102, lower muffler 103, low-pressure compression chamber 110, intake port 111 of low-pressure compression chamber, first cavity 120, connecting channel 130, injection enthalpy hole 140, second cylinder 201, upper bearing 202, upper muffler 203, high-pressure compression chamber 210, third cavity 220, partition assembly 300, second cavity 301, first partition 310, second partition 320, crankshaft 400, first eccentric part 410, second eccentric part 420, first piston 510, second piston 520, housing 600, inner cavity 610, enthalpy enhancement assembly 700, exhaust pipe 710, motor assembly 800, stator 810, rotor 820. Detailed Implementation

[0032] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0033] In the description of this utility model, it should be understood that the orientation descriptions, such as up, down, etc., are based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0034] In the description of this utility model, "multiple" refers to two or more. The use of "first" and "second" is for distinguishing technical features only and should not be construed as indicating or implying relative importance, or implicitly indicating the number of technical features or their sequential relationship.

[0035] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0036] In related technologies, compressors employ multi-stage compression technology to distribute the pressure ratio of each compression stage, ensuring the compression components operate within a more reasonable pressure ratio range, thereby improving the compressor's volumetric efficiency. Existing compressor pump assemblies include a first cylinder, a second cylinder, and a partition assembly located between the first and second cylinders. The first cylinder has a low-pressure compression chamber, and the second cylinder has a high-pressure compression chamber. To reduce intake and exhaust pulsation, a cavity connecting the low-pressure and high-pressure compression chambers is typically provided on the partition assembly to minimize refrigerant flow loss. However, this method of providing a cavity on the partition assembly results in an excessively large distance between the first and second cylinders, affecting the compressor's mechanical efficiency and performance. It is understood that the compressor's pressure ratio is generally the ratio of the inlet and outlet pressures, but in this case, there are pressure ratios for different compression chambers.

[0037] For example, refer to Figure 1 , Figure 1 This is a cross-sectional schematic diagram of a pump body assembly according to an embodiment of the present invention. For example... Figure 1 As shown, in one embodiment of the present invention, a pump body assembly includes a crankshaft 400, a first compression assembly, a second compression assembly, and a baffle assembly 300. Along the axial direction of the crankshaft 400, the first compression assembly, the baffle assembly 300, and the second compression assembly are sequentially connected. The first compression assembly has a low-pressure compression chamber 110, a first cavity 120, and a connecting channel 130. The exhaust port of the low-pressure compression chamber 110 and the connecting channel 130 are respectively connected to the first cavity 120. The second compression assembly has a high-pressure compression chamber 210, and the baffle assembly 300 has a second cavity 301. The intake port of the high-pressure compression chamber 210 and the connecting channel 130 are respectively connected to the second cavity 301. When the pump body assembly is working, the refrigerant outside the pump body assembly flows from... The refrigerant is drawn into the low-pressure compression chamber 110 through the intake port 111 of the low-pressure compression chamber. The refrigerant completes primary compression in the low-pressure compression chamber 110. Afterward, the refrigerant is discharged into the first chamber 120 through the exhaust port of the low-pressure compression chamber 110. The refrigerant in the first chamber 120 flows into the second chamber 301 through the connecting channel 130. The refrigerant in the second chamber 301 is drawn into the high-pressure compression chamber 210 through the intake port. The refrigerant completes secondary compression in the high-pressure compression chamber 210. On the one hand, the low-pressure compression chamber 110 and the high-pressure compression chamber 210 are within a reasonable pressure ratio range, which can improve the volumetric efficiency of the compressor. On the other hand, it can effectively reduce the intake pulsation and exhaust pulsation of the pump assembly, thereby improving the performance of the compressor.

[0038] It should be noted that, along the axial direction of the crankshaft 400, the crankshaft 400 includes a first eccentric part 410 and a second eccentric part 420 spaced apart. The first eccentric part 410 is fitted with a first piston 510, and the second eccentric part 420 is fitted with a second piston 520. The first piston 510 is rotatably disposed in the low-pressure compression chamber 110, and the second piston 520 is rotatably disposed in the high-pressure compression chamber 210.

[0039] It should be noted that the axis O1 of the pump body assembly coincides with the axis of the crankshaft 400, which will not be described in detail here.

[0040] It should be noted that the first cavity 120 and the second cavity 301 are connected by the connecting channel 130 to form an intermediate cavity. When the refrigerant flows in the intermediate cavity, the refrigerant can be cooled to a certain extent, which helps to reduce the input force required for compression in the high-pressure compression cavity 210 and improve the energy efficiency of the compressor.

[0041] For example Figure 1 As shown in the embodiment of this utility model, the minimum flow area of ​​the connecting channel 130 is S1, and the minimum cross-sectional area of ​​the second cavity 301 on the cross-section passing through the axis O1 of the pump body assembly is S2, satisfying: 0.45≤S2 / S1≤3. For example, S2 / S1 can be 0.45, 0.5, 0.8, 1, 1.5, 2, 2.5, 3, etc. It should be noted that the units of flow area and cross-sectional area are both mm. 2 This unit will be used in all subsequent embodiments.

[0042] Understandably, when S2 / S1 is less than 0.45, the minimum flow area of ​​the connecting channel 130 is too small, resulting in significant refrigerant flow loss and insufficient pressure of the refrigerant discharged from the high-pressure compression chamber 210, which is detrimental to improving compressor performance. When S2 / S1 is greater than 3, the minimum cross-sectional area of ​​the second chamber 301 is too large on the cross-section of the shaft O1 passing through the pump body assembly, leading to excessive spacing between the first and second compression assemblies. During compressor operation, the crankshaft 400 deflects more, making it prone to bending and deformation, resulting in increased wear and reduced compressor mechanical efficiency, thus degrading compressor performance. Therefore, a reasonable design of the relationship between the minimum flow area of ​​the connecting channel 130 and the minimum cross-sectional area of ​​the second chamber 301 on the cross-section of the shaft O1 passing through the pump body assembly can reduce refrigerant flow loss while decreasing crankshaft deflection, thereby improving compressor performance.

[0043] It should be noted that the shape of the cross-section of the second cavity 301 on the cross-section passing through the axis O1 of the pump body assembly can be rectangular, circular or elliptical, etc., and there is no limitation here.

[0044] Reference Figure 4 , Figure 4This is a graph showing the relationship between the ratio of the minimum flow area of ​​the connecting channel 130 and the minimum cross-sectional area of ​​the second cavity 301 on the cross-section passing through the axis O1 of the pump body assembly, and the compressor COP, according to one embodiment of the present invention. Figure 4 The points in the diagram represent the performance improvement of the compressor under different values ​​of S2 / S1. Figure 4 The dashed line in the figure represents the fitted curve at multiple points. As the value of S2 / S1 gradually increases, within the range of 0.45 to 3, the increase in the compressor's COP first gradually increases and then decreases. Therefore, by rationally designing the relationship between the minimum flow area of ​​the connecting channel 130 and the minimum cross-sectional area of ​​the second cavity 301 on the cross-section passing through the axis O1 of the pump body assembly, the compressor's performance can be improved. It should be noted that during cooling, COP refers to the ratio of the compressor's cooling capacity to its input power; during heating, it is the COP+1 of the cooling capacity. The higher the COP value, the higher the compressor's efficiency and the more energy-saving it is.

[0045] In this embodiment of the invention, the ratio of the displacement of the high-pressure compression chamber 210 to the displacement of the low-pressure compression chamber 110 is V. P Satisfying: 0.4 ≤ V P ≤0.8, displacement is in cc, for example, V P =0.4, V P =0.5, V P =0.6, V P =0.7, V P =0.8. Taking the displacement of the high-pressure compression chamber 210 as an example, when V P When V is less than 0.4, the displacement of the low-pressure compression chamber 110 is too large, and the high-pressure compression chamber 210 cannot completely consume the refrigerant discharged from the low-pressure compression chamber 110, resulting in excess performance and a decrease in the volumetric efficiency of the compressor; when V P When the ratio is greater than 0.8, for low-temperature heating conditions, the displacement of the low-pressure compression chamber 110 is too small, and the intake volume of the high-pressure compression chamber 210 is too small, resulting in a decrease in the compressor's heating capacity and a poor user experience. Therefore, by rationally designing the ratio of the displacement of the high-pressure compression chamber 210 to that of the low-pressure compression chamber 110, it is possible to reduce intake and exhaust pulsations, reduce vibration and noise, and improve the compressor's volumetric efficiency.

[0046] Reference Figure 2 , Figure 3 , Figure 2 This is a cross-sectional schematic diagram of a compressor according to an embodiment of the present invention. Figure 3 for Figure 2A cross-sectional view along line AA. As shown in the figure, in this embodiment of the present invention, the first compression component is provided with an enthalpy injection orifice 140, which is connected to the connecting channel 130. The outlet pipe 710 of the enthalpy-increasing component 700 is inserted into the enthalpy injection orifice 140 so that the enthalpy-increasing component 700 can deliver refrigerant to the second cavity 301. It can be understood that since the low-pressure compression chamber 110 discharges refrigerant into the second cavity 301 after compressing the refrigerant, the refrigerant delivered by the enthalpy-increasing component 700 to the second cavity 301 can mix with the refrigerant in the second cavity 301, and finally enter the interior of the high-pressure compression chamber 210 through the intake port of the high-pressure compression chamber 210. Therefore, the second cavity 301 can fully mix the refrigerant inside it with the refrigerant of the enthalpy-increasing component 700, reducing the problem of excessive pulsation when the two refrigerants are mixed and improving the mixing efficiency.

[0047] In this embodiment of the invention, the minimum diameter of the enthalpy injection orifice 140 is D1, and the minimum diameter of the connecting channel 130 is D2, satisfying the condition that D1 / D2 ≥ 0.5. This increases the flow rate of refrigerant supplied from the enthalpy enhancement component 700, ensuring smooth gas supply and improving compressor performance. It is understood that, taking the minimum diameter of the connecting channel 130 as an example, if D1 / D2 < 0.5, the minimum diameter of the enthalpy injection orifice 140 is too small, limiting the flow rate of refrigerant supplied from the enthalpy enhancement component 700, resulting in insufficient gas supply and affecting compressor performance.

[0048] In this embodiment of the present invention, the refrigerant outside the pump body assembly is drawn into the low-pressure compression chamber 110 through the air intake 111 of the low-pressure compression chamber. The angle between the line connecting the center of the air intake 111 of the low-pressure compression chamber and the axis O1 of the pump body assembly and the line connecting the center of the injection enthalpy hole 140 and the center of the first cylinder 101 is θ, which satisfies: θ≤90°. For example, the value of θ can be 10°, 20°, 30°, 40°, 50°, 60°, 70°, 80°, or 90°. Understandably, the angle between the center of the suction port 111 of the low-pressure compression chamber and the center of the suction port of the high-pressure compression chamber 210 corresponding to the axis O1 of the pump body assembly is between 2° and 3°. When θ is greater than 90°, the distance between the suction port 111 of the low-pressure compression chamber and the enthalpy injection orifice 140 is too large. Similarly, the distance between the suction port of the high-pressure compression chamber 210 and the enthalpy injection orifice 140 is too large, resulting in an excessively long travel distance for the refrigerant supplied from the enthalpy-enhancing assembly 700. On the one hand, this increases the flow resistance of the refrigerant, and on the other hand, weakens the cooling effect of the enthalpy injection, which is detrimental to improving the performance of the compressor. Therefore, by rationally designing the angle between the center of the suction port 111 of the low-pressure compression chamber and the center of the enthalpy injection orifice 140 corresponding to the center of the first cylinder 101, the flow resistance of the refrigerant supplied from the enthalpy-enhancing assembly 700 can be reduced, ensuring smooth air supply and improving the performance of the compressor.

[0049] In an embodiment of this utility model, the first compression assembly includes a first cylinder 101, a lower bearing 102, and a lower muffler 103. The lower bearing 102 is connected to the lower end face of the first cylinder 101, and the lower muffler 103 is connected to the lower bearing 102. The lower bearing 102 and the lower muffler 103 together form a first cavity 120. The low-pressure compression cavity 110, the connecting channel 130, and the injection enthalpy hole 140 are respectively located in the first cylinder 101. The refrigerant in the low-pressure compression cavity 110 sequentially enters the first cavity 120, the connecting channel 130, and the second cavity 301, and finally enters the high-pressure compression cavity 210, which helps to reduce exhaust pulsation and improve the performance of the compressor.

[0050] In an embodiment of this utility model, the second compression assembly includes a second cylinder 201, an upper bearing 202, and an upper muffler 203. The lower end face of the partition assembly 300 is connected to the upper end face of the first cylinder 101, and the upper end face of the partition assembly 300 is connected to the lower end face of the second cylinder 201. The upper bearing 202 is connected to the upper end face of the second cylinder 201, and the upper muffler 203 is connected to the upper bearing 202. A third cavity 220 is formed between the upper bearing 202 and the upper muffler 203. The exhaust port of the high-pressure compression chamber 210 is connected to the third cavity 220. The refrigerant discharged from the high-pressure compression chamber 210 can enter the third cavity 220 and then be discharged into the inner cavity 610 of the compressor housing 600, which helps to reduce exhaust noise and improve the user experience.

[0051] It is understood that the lower bearing 102 is equipped with a valve seat, allowing the refrigerant in the low-pressure compression chamber 110 to enter the first chamber 120 through the valve seat. In another embodiment of this invention, both the lower bearing 102 and the partition assembly 300 are equipped with valve seats, allowing the refrigerant in the low-pressure compression chamber 110 to enter the first chamber 120 and the second chamber 301 through the two valve seats respectively. That is, the low-pressure compression chamber 110 adopts a dual-exhaust scheme, which can effectively reduce exhaust losses and improve the performance of the compressor.

[0052] In an embodiment of this utility model, the partition assembly 300 includes a first partition 310 and a second partition 320. The first partition 310 and the second partition 320 are arranged opposite each other along the axial direction of the pump body assembly. The first partition 310 is located below the second partition 320. The first partition 310 and the second partition 320 enclose each other to form a second cavity 301. The first partition 310 is connected to the first compression assembly, and the second partition 320 is connected to the second compression assembly. The first partition 310 and the second partition 320 can be processed separately, which is beneficial for manufacturing the second cavity 301 on the partition assembly 300 and can reduce the processing and manufacturing cost of the partition assembly 300.

[0053] For example, the second cavity 301 has an annular structure and is arranged around the axis O1 of the pump body assembly. By dividing the partition assembly 300 into a first partition 310 and a second partition 320, the first partition 310 and the second partition 320 can be processed separately. This facilitates the processing and manufacturing of the second cavity 301 on the partition assembly 300 and can reduce the processing and manufacturing cost of the partition assembly 300.

[0054] It should be noted that a connecting structure is provided between the first partition 310 and the second partition 320. This connecting structure is used to connect and fix the first partition 310 and the second partition 320. For example, the connecting structure includes a connector, which is a screw or bolt. The connector includes a rod and a head at one end of the rod. The rod passes through the second partition 320 and is threadedly connected to the first partition 310. The head is installed inside the second partition 320, facilitating the connection and fixation of the first partition 310 and the second partition 320. Alternatively, the connector can be a pin. One end of the connector is fixedly connected to the first partition 310, and the other end is fixedly connected to the second partition 320. This also facilitates the connection and fixation of the first partition 310 and the second partition 320, and will not be elaborated further here.

[0055] It should be noted that there are multiple connectors arranged around the axis O1 of the pump body assembly, which can increase the connection stability between the first baffle 310 and the second baffle 320, which will not be described in detail here.

[0056] In this embodiment of the present invention, multiple connecting channels 130 are configured, and the multiple connecting channels 130 are arranged at intervals around the axis O1 of the pump body assembly. The two ends of each connecting channel 130 are respectively connected to the first cavity 120 and the second cavity 301. By setting multiple connecting channels 130, the total flow area of ​​the multiple connecting channels 130 is increased, which can reduce the flow rate of the refrigerant and thus reduce flow loss.

[0057] It is understandable that the more connecting channels 130 there are, the lower the radial strength of the first cylinder 101 will be. In this embodiment, in order to ensure the radial strength of the first cylinder 101, the number of connecting channels 130 is configured to be less than or equal to 5, for example, the number of connecting channels 130 is 2, 3, 4, 5, etc.

[0058] As another implementation, the number of communication channels 130 can also be configured to be one, and there is no limitation here.

[0059] In an embodiment of this invention, the gaseous refrigerant used for replenishing the gas in the enthalpy-enhancing component 700 can be provided by a flash evaporator, which is installed in the circulation loop of the refrigeration or 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 completely liquid refrigerant to a gas-liquid mixture. The gas-liquid mixture then enters the flash evaporator. The gaseous refrigerant flows along the outlet of the flash evaporator to the enthalpy-enhancing component 700, while 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, enters the low-pressure compression chamber 110 through the liquid receiver. In another embodiment of this invention, the flash evaporator can also be replaced by a plate heat exchanger, that is, the refrigerant used for replenishing the gas in the enthalpy-enhancing component 700 can also be provided by a plate heat exchanger. The appropriate solution is selected according to the actual situation.

[0060] The compressor of the second aspect of this utility model includes a housing 600 and a pump assembly as described in the above embodiments. The housing 600 has an inner cavity 610, and the pump assembly is installed in the inner cavity 610. By employing the pump assembly of the above embodiments, when the pump assembly is working, refrigerant outside the pump assembly is drawn into the low-pressure compression chamber 110 from the intake port 111. The refrigerant completes primary compression in the low-pressure compression chamber 110. Then, the refrigerant is discharged into the first chamber 120 through the exhaust port of the low-pressure compression chamber 110. The refrigerant in the first chamber 120 flows into the second chamber 301 through the connecting channel 130. The refrigerant in the second chamber 301 is drawn into the high-pressure compression chamber 210 from the intake port. The refrigerant completes secondary compression in the high-pressure compression chamber 210. On the one hand, the low-pressure compression chamber 110 and the high-pressure compression chamber 210 are within a reasonable pressure ratio range, which can improve the volumetric efficiency of the compressor. On the other hand, it can effectively reduce the intake and exhaust pulsations of the pump assembly. Since the minimum flow area of ​​the connecting channel 130 is S1, the minimum cross-sectional area of ​​the second cavity 301 on the cross-section of the axis O1 passing through the pump body assembly is S2, satisfying: 0.45≤S2 / S1≤3. When S2 / S1 is less than 0.45, the minimum flow area of ​​the connecting channel 130 is too small, the refrigerant flow loss is large, and the pressure of the refrigerant discharged from the high-pressure compression chamber 210 is insufficient, which is not conducive to improving the performance of the compressor. When S2 / S1 is greater than 3, the minimum cross-sectional area of ​​the second cavity 301 on the cross-section of the axis O1 passing through the pump body assembly is too large, the distance between the first compression assembly and the second compression assembly is too large, and the deflection of the crankshaft 400 increases during the operation of the compressor. The crankshaft 400 is prone to bending and deformation, which leads to increased wear of the crankshaft 400, reduced mechanical efficiency of the compressor, and decreased performance of the compressor. Therefore, by rationally designing the relationship between the minimum flow area of ​​the connecting channel 130 and the minimum cross-sectional area of ​​the second cavity 301 on the cross-section of the axis O1 of the pump body assembly, it is possible to reduce the flow loss of refrigerant while reducing the deflection of the crankshaft 400, thereby improving the performance of the compressor.

[0061] In this embodiment, the upper bearing 202 of the pump body assembly is fixedly connected to the inner circumferential surface of the inner cavity 610, or the first cylinder 101 and / or the second cylinder 201 are fixedly connected to the inner circumferential surface of the inner cavity 610. The fixed connection can be achieved by welding or interference fit. The welding method includes, but is not limited to, resistance welding and laser welding.

[0062] In this embodiment, the compressor also includes a motor assembly 800, which includes a stator 810 and a rotor 820 rotatably disposed within the stator 810. The outer peripheral surface of the rotor 820 abuts against the inner peripheral surface of the housing 600. The rotor 820 is fixedly connected to the upper end of the crankshaft 400, and the stator 810 drives the crankshaft 400 to rotate through the rotor 820.

[0063] Since the compressor adopts all the technical solutions of the pump body assembly of the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0064] The refrigeration equipment according to the third aspect of this utility model includes the compressor described in the above embodiments. The refrigeration equipment can be a central air conditioning system, a packaged air conditioner, a split air conditioner, a ducted air conditioner, a window air conditioner, etc.

[0065] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A pump body assembly, characterized in that, include: The first compression assembly includes a low-pressure compression chamber, a first cavity, and a connecting channel. The exhaust port of the low-pressure compression chamber is connected to the connecting channel through the first cavity. The minimum flow area of ​​the connecting channel is S1. The second compression assembly is equipped with a high-pressure compression chamber; A partition assembly is connected between the first compression assembly and the second compression assembly. The partition assembly has a second cavity. The air intake of the high-pressure compression cavity is connected to the communication channel through the second cavity. On the cross-section of the axis of the pump body assembly, the minimum cross-sectional area of ​​the second cavity is S2, which satisfies: 0.45≤S2 / S1≤3.

2. The pump body assembly according to claim 1, characterized in that: The ratio of the displacement of the high-pressure compression chamber to the displacement of the low-pressure compression chamber is V. P Satisfying: 0.4 ≤ V P ≤0.

8.

3. The pump body assembly according to claim 1, characterized in that: The first compression component is provided with an enthalpy injection hole that connects to the communication channel, and the enthalpy injection hole is used to supply refrigerant to the second cavity by the enthalpy enhancement component.

4. The pump body assembly according to claim 3, characterized in that: The minimum diameter of the enthalpy injection orifice is D1, and the minimum diameter of the connecting channel is D2, satisfying: D1 / D2≥0.

5.

5. The pump body assembly according to claim 3, characterized in that: The angle between the center of the air intake of the low-pressure compression chamber and the center of the enthalpy injection hole and the axis of the pump body assembly is θ, which satisfies: θ≤90°.

6. The pump body assembly according to claim 3, characterized in that: The first compression assembly includes a first cylinder, a lower bearing, and a lower muffler. The low-pressure compression chamber, the connecting channel, and the injection enthalpy hole are respectively located inside the first cylinder. The lower bearing and the lower muffler are both connected to the first cylinder. The lower bearing and the lower muffler together form the first cavity. The partition assembly is located on the side of the first cylinder away from the lower bearing.

7. The pump body assembly according to claim 1, characterized in that: The second compression assembly includes a second cylinder, an upper bearing, and an upper muffler. The high-pressure compression chamber is located inside the second cylinder. The upper bearing and the upper muffler are both connected to the second cylinder. The partition assembly is located on the side of the second cylinder away from the upper bearing.

8. The pump body assembly according to claim 1, characterized in that: The baffle assembly includes a first baffle and a second baffle disposed opposite to each other along the axial direction of the pump body assembly. The first baffle and the second baffle enclose the second cavity. The first baffle is connected to the first compression assembly, and the second baffle is connected to the second compression assembly.

9. The pump body assembly according to claim 1, characterized in that: The communication channels are configured in multiple ways, and the multiple communication channels are arranged at intervals around the axis of the pump body assembly. The two ends of each communication channel are respectively connected to the first cavity and the second cavity.

10. A compressor, characterized in that, include: The pump assembly according to any one of claims 1 to 9.

11. A refrigeration device, characterized in that: Includes the compressor as described in claim 10.

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