Pump body assembly, compressor and refrigeration equipment

Abstract

The invention discloses a pump body assembly, a compressor and refrigeration equipment, the pump body assembly is provided with a low-pressure compression cavity, a middle cavity and a high-pressure compression cavity, the high-pressure compression cavity is provided with a first air suction port, an exhaust port of the low-pressure compression cavity is communicated with the first air suction port through the middle cavity, the middle cavity is provided with an enthalpy spraying hole, the working volume of the low-pressure compression cavity is V1, the working volume of the high-pressure compression cavity is V2, the minimum diameter of the enthalpy spraying hole is D1, the included angle between the center of the enthalpy spraying hole and the center of the first air suction port and the axis of the pump body assembly is theta, the minimum distance between the center of the enthalpy spraying hole and the first air suction port in the axial direction of the pump body assembly is H, and U = (V2 * D12) / (V1 * H * theta) is larger than or equal to 0.18 and smaller than or equal to 62.4. The enthalpy spraying path of the compressor can be optimized, the flow loss of refrigerants supplemented from the enthalpy increasing assembly is reduced, the air supplementing amount is increased, and therefore the performance of the compressor is improved.

Description

Technical Field

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

[0002] The existing pump body assembly is provided with a low-pressure compression chamber, an intermediate chamber and a high-pressure compression chamber. The exhaust port of the low-pressure compression chamber is communicated with the suction port of the high-pressure compression chamber through the intermediate chamber. A jet enthalpy hole communicating with the intermediate chamber is arranged on the pump body assembly, and the jet enthalpy hole is used for supplying refrigerant to the intermediate chamber by an enthalpy-increasing assembly, so as to improve the low-temperature heating capacity of the compressor. During the operation of the compressor, the flow loss of the refrigerant conveyed by the enthalpy-increasing assembly increases, resulting in the reduction of the performance of the compressor. Summary of the Invention

[0003] The present invention aims to at least solve one of the technical problems existing in the prior art. For this purpose, the present invention provides a pump body assembly, which can reduce the flow loss of the refrigerant conveyed by the enthalpy-increasing assembly and improve the performance of the compressor.

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

[0005] The present invention also provides a refrigeration device having the above compressor.

[0006] The pump body assembly according to the first aspect embodiment of the present invention is provided with a low-pressure compression chamber, an intermediate chamber and a high-pressure compression chamber. The high-pressure compression chamber has a first suction port. The exhaust port of the low-pressure compression chamber is communicated with the first suction port through the intermediate chamber. The intermediate chamber has a jet enthalpy hole, and the jet enthalpy hole is used for supplying refrigerant to the intermediate chamber by an enthalpy-increasing assembly.

[0007] Wherein, the working volume of the low-pressure compression chamber is V1, the working volume of the high-pressure compression chamber is V2, the minimum diameter of the jet enthalpy hole is D1, and the included angle between the center of the jet enthalpy hole and the center of the first suction port corresponding to the axis of the pump body assembly is θ. Along the axial direction of the pump body assembly, the minimum distance between the center of the jet enthalpy hole and the first suction port is H, and it satisfies:

[0008] The pump body assembly according to the first aspect embodiment of the present invention has at least the following beneficial effects:

[0009] When the pump body assembly is working, the refrigerant completes the first-stage compression in the low-pressure compression chamber. After that, the refrigerant is discharged into the intermediate chamber. The refrigerant in the intermediate chamber is sucked into the high-pressure compression chamber from the first suction port. The refrigerant completes the second-stage compression in the high-pressure compression chamber. The enthalpy-increasing assembly can deliver refrigerant to the intermediate chamber through the enthalpy injection holes. After compressing the refrigerant, the low-pressure compression chamber will discharge the refrigerant into the intermediate chamber. The refrigerant delivered by the enthalpy-increasing assembly to the intermediate chamber can be mixed with the refrigerant in the intermediate chamber, and finally, they enter the interior of the high-pressure compression chamber together through the first suction port. The intermediate chamber can enable the refrigerant inside it to be fully mixed with the refrigerant replenished from the enthalpy-increasing assembly, reducing the problem of excessive pulsation when the two refrigerant streams are mixed and improving the cooling effect of the refrigerant. When U is less than 0.18, the working volume V1 of the low-pressure compression chamber is too large, and the high-pressure compression chamber cannot completely consume the refrigerant discharged from the low-pressure compression chamber, resulting in performance surplus. The minimum distance H between the center of the enthalpy injection hole and the first suction port is too large, and the angle θ between the center of the enthalpy injection hole and the center of the first suction port corresponding to the axis O1 of the pump body assembly is too large. The flow time of the refrigerant in the intermediate chamber is prolonged, resulting in heat exchange between the refrigerant replenished from the enthalpy-increasing assembly and the high-temperature refrigerant inside the compressor housing. The refrigerant replenished from the enthalpy-increasing assembly becomes overheated, affecting the cooling effect of the enthalpy-increasing assembly. Under the combined influence of the large working volume V1 of the low-pressure compression chamber, the large minimum distance H between the center of the enthalpy injection hole and the first suction port, and the large angle θ between the center of the enthalpy injection hole and the center of the first suction port corresponding to the axis O1 of the pump body assembly, the performance of the compressor decreases; when U is greater than 62.4, the working volume V1 of the low-pressure compression chamber is too small, the suction volume of the high-pressure compression chamber is insufficient, the angle θ between the center of the enthalpy injection hole and the center of the first suction port corresponding to the axis O1 of the pump body assembly is too small, the minimum distance H between the center of the enthalpy injection hole and the first suction port is too small, the refrigerant inside the intermediate chamber and the refrigerant replenished from the enthalpy-increasing assembly cannot be fully mixed, the refrigerant in the high-pressure compression chamber is locally supercooled or overheated, and the leakage amount of the refrigerant in the high-pressure compression chamber increases, resulting in a decrease in the performance of the compressor. Therefore, by reasonably designing the relationship between the working volume V1 of the low-pressure compression chamber, the working volume V2 of the high-pressure compression chamber, the minimum diameter D1 of the enthalpy injection hole, the angle θ between the center of the enthalpy injection hole and the center of the first suction port corresponding to the axis O1 of the pump body assembly, and the minimum distance H between the center of the enthalpy injection hole and the first suction port, the enthalpy injection path of the compressor can be optimized, the flow loss of the refrigerant replenished from the enthalpy-increasing assembly can be reduced, the gas replenishing amount can be increased, and thus the performance of the compressor can be improved.

[0010] According to some embodiments of the present invention, the low-pressure compression chamber has a second suction port, and the minimum diameter of the second suction port is D2, satisfying: 0.2 ≤ D1 / D2 ≤ 1.

[0011] According to some embodiments of the present invention, the ratio of the working volume of the high-pressure compression chamber to the working volume of the low-pressure compression chamber is V2 / V1, satisfying: 0.4 ≤ V2 / V1 ≤ 0.8.

[0012] According to some embodiments of the present invention, the pump body assembly includes a lower bearing, a first cylinder, a partition assembly, a second cylinder, and an upper bearing connected in sequence. The lower bearing, the first cylinder, and the partition assembly enclose the low-pressure compression chamber. The upper bearing, the second cylinder, and the partition assembly enclose the high-pressure compression chamber. The partition assembly is provided with the intermediate chamber. At least one of the lower bearing, the first cylinder, the partition assembly, the second cylinder, and the upper bearing is provided with the enthalpy injection hole.

[0013] According to some embodiments of the present invention, the pump body assembly includes a lower bearing, a first cylinder, a partition assembly, a second cylinder, and an upper bearing connected in sequence. The low-pressure compression chamber is located in the first cylinder, and the high-pressure compression chamber is located in the second cylinder. The lower bearing is provided with a lower muffler, and the lower bearing and the lower muffler enclose a first cavity. The partition assembly is provided with a second cavity. The first cylinder is provided with a communication channel. The first cavity, the second cavity, and the communication channel constitute the intermediate chamber. The first cavity and the second cavity are communicated through the communication channel. At least one of the lower bearing, the first cylinder, the partition assembly, the second cylinder, and the upper bearing is provided with the enthalpy injection hole.

[0014] According to some embodiments of the present invention, the partition assembly includes a first partition and a second partition oppositely arranged along the axial direction of the pump body assembly. The first partition is connected to the upper end surface of the first cylinder, and the second partition is connected to the lower end surface of the second cylinder. The first partition and the second partition enclose at least part of the intermediate chamber.

[0015] According to some embodiments of the present invention, a plurality of communication channels are configured, and the plurality of communication channels are arranged around the axis of the pump body assembly. Two ends of each communication channel are respectively communicated with the first cavity and the second cavity.

[0016] According to the compressor of the second aspect embodiment of the present invention, it includes a housing, an enthalpy-increasing assembly, and the pump body assembly described in the above embodiments. The pump body assembly is installed in the housing, and the enthalpy-increasing assembly is installed outside the housing. The enthalpy-increasing assembly includes an intake pipe, and the intake pipe penetrates into the housing and is fixedly connected to the pump body assembly.

[0017] According to some embodiments of the present invention, the compressor further includes a check mechanism for preventing the refrigerant from flowing back from the intermediate chamber to the enthalpy-increasing assembly.

[0018] According to some embodiments of the present invention, the check mechanism is a one-way valve, and the one-way valve is installed on one side of the intake pipe adjacent to the intermediate chamber; or,

[0019] The check mechanism is an exhaust valve seat, and the exhaust valve seat is installed at one end of the injection enthalpy hole away from the intake pipe.

[0020] The refrigeration device according to the third aspect embodiment of the present invention includes the compressor described in the above embodiments.

[0021] The additional aspects and advantages of the present invention will be partly given in the following description, partly will become obvious from the following description, or be understood through the practice of the present invention. Description of the Drawings

[0022] The following further describes the present invention in conjunction with the drawings and embodiments, where:

[0023] Figure 1 is a schematic cross-sectional view of a pump body assembly according to an embodiment of the present invention;

[0024] Figure 2 is a schematic cross-sectional view of a compressor according to an embodiment of the present invention;

[0025] Figure 3 is Figure 2 a cross-sectional view taken along line A-A in

[0026] Figure 4 is a relationship diagram of U and compressor COP according to an embodiment of the present invention.

[0027] Reference Numerals in the Drawings:

[0028] Axis O1, lower bearing 101, first cylinder 102, partition assembly 103, first partition 1031, second partition 1032, second cylinder 104, upper bearing 105, lower muffler 106, upper muffler 107, low-pressure compression chamber 110, second suction port 111, intermediate chamber 120, first cavity 121, second cavity 122, communication channel 123, high-pressure compression chamber 130, first suction port 131, injection enthalpy hole 140, third cavity 150, crankshaft 200, first eccentric part 210, second eccentric part 220, first piston 230, second piston 240, housing 300, inner cavity 310, enthalpy-increasing assembly 400, intake pipe 410, motor assembly 500, stator 510, rotor 520. Detailed Embodiments

[0029] The following details the embodiments of the present invention. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation of the present invention.

[0030] In the description of the present invention, it should be understood that for the orientation descriptions, such as up, down, etc., the orientation or positional relationship indicated is based on the orientation or positional relationship shown in the drawings. This is 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. Therefore, it should not be construed as a limitation to the present invention.

[0031] In the description of the present invention, "a plurality of" means more than two. If the first and second are described, it is only for the purpose of distinguishing technical features, and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features or implicitly specifying the sequence of the indicated technical features.

[0032] In the description of the present invention, unless otherwise clearly defined, terms such as "arrangement", "installation", "connection", etc. should be understood in a broad sense. Those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific content of the technical solution.

[0033] In the related art, the pump body assembly is provided with 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 suction port of the high-pressure compression chamber through the intermediate chamber. A jet enthalpy hole communicating with the intermediate chamber is provided on the pump body assembly. The jet enthalpy hole is used for supplying the enthalpy-increasing assembly to supplement gas to the intermediate chamber, thereby improving the low-temperature heating capacity of the compressor. During the operation of the compressor, the flow loss of the refrigerant transported by the enthalpy-increasing assembly increases, resulting in a reduction in the performance of the compressor.

[0034] Refer to Figure 1 , Figure 1 is a schematic cross-sectional view of the pump body assembly according to an embodiment of the present invention. For example Figure 1As shown in the figure, a pump body assembly according to an embodiment of the present invention includes a crankshaft 200, a lower muffler 106, a lower bearing 101, a first cylinder 102, a partition assembly 103, a second cylinder 104, and an upper bearing 105. The crankshaft 200 includes a first eccentric portion 210 and a second eccentric portion 220 that are axially spaced along the crankshaft 200. A first piston 230 is sleeved on the first eccentric portion 210, and a second piston 240 is sleeved on the second eccentric portion 220. The lower bearing 101 is connected to the lower end surface of the first cylinder 102. The lower muffler 106 is connected to a side of the lower bearing 101 away from the first cylinder 102. The lower muffler 106 and the lower bearing 101 enclose a first cavity 121. The first cylinder 102 is provided with a communication channel 123. The partition assembly 103 is connected between the first cylinder 102 and the second cylinder 104. The partition assembly 103 is provided with a second cavity 122. The first cavity 121, the second cavity 122, and the communication channel 123 constitute an intermediate cavity 120. The upper bearing 105 is connected to the upper end surface of the second cylinder 104. The first cylinder 102, the lower bearing 101, and the partition assembly 103 enclose a low-pressure compression cavity 110. The first piston 230 is rotatably arranged in the low-pressure compression cavity 110. The second cylinder 104, the upper bearing 105, and the partition assembly 103 enclose a high-pressure compression cavity 130. The second piston 240 is rotatably arranged in the high-pressure compression cavity 130. The high-pressure compression cavity 130 has a first suction port 131. The exhaust port of the low-pressure compression cavity 110 is communicated with the first suction port 131 through the intermediate cavity 120. It can be understood that when the pump body assembly works, the refrigerant is compressed at the first stage in the low-pressure compression cavity 110. After that, the refrigerant is discharged into the intermediate cavity 120. The refrigerant in the intermediate cavity 120 is sucked into the high-pressure compression cavity 130 from the first suction port 131. The refrigerant is compressed at the second stage in the high-pressure compression cavity 130. On the one hand, the low-pressure compression cavity 110 and the high-pressure compression cavity 130 are within a reasonable pressure ratio range, which can improve the volumetric efficiency of the compressor. On the other hand, the suction pulsation and exhaust pulsation of the pump body assembly can be effectively reduced, thereby improving the performance of the compressor.

[0035] As another implementation manner, the intermediate cavity 120 may also be only provided in the partition assembly 103, as long as it is beneficial to cool the refrigerant in the intermediate cavity 120, and no limitation is made here.

[0036] It should be noted that the axis O1 of the pump body assembly coincides with the axis of the crankshaft 200, which will not be elaborated here.

[0037] For example Figure 1As shown, in an embodiment of the present invention, the first cylinder 102 is provided with an enthalpy injection hole 140 communicating with the intermediate cavity 120. The intake pipe 410 of the enthalpy injection assembly 400 is inserted into the enthalpy injection hole 140, and the enthalpy injection assembly 400 can deliver refrigerant to the intermediate cavity 120 through the enthalpy injection hole 140. It can be understood that since the low-pressure compression cavity 110 discharges the refrigerant into the intermediate cavity 120 after compressing the refrigerant, the refrigerant delivered by the enthalpy injection assembly 400 to the intermediate cavity 120 can be mixed with the refrigerant in the intermediate cavity 120, and finally enter the interior of the high-pressure compression cavity 130 together through the first suction port 131. Therefore, the intermediate cavity 120 can enable the refrigerant inside it to be fully mixed with the refrigerant replenished from the enthalpy injection assembly 400, reduce the problem of excessive pulsation when the two refrigerant streams are mixed, and improve the cooling effect of the refrigerant.

[0038] Referring to Figures 1 to 3 , Figure 2 is a cross-sectional view of the compressor according to an embodiment of the present invention, Figure 3 is Figure 2 the cross-sectional view along line A-A in Figure 3 The circular dotted line in is the projection of the first suction port 131 on the first cylinder 102. The line connecting the center of the first suction port 131 and the axis O1 of the pump body assembly coincides with the line connecting the center of the second suction port 111 and the axis O1 of the pump body assembly. In an embodiment of the present invention, the working volume of the low-pressure compression cavity 110 is V1, the working volume of the high-pressure compression cavity 130 is V2, the minimum diameter of the enthalpy injection hole 140 is D1, and the included angle between the center of the enthalpy injection hole 140 and the center of the first suction port 131 corresponding to the axis O1 of the pump body assembly is θ. Along the axial direction of the pump body assembly, the minimum distance between the center of the enthalpy injection hole 140 and the first suction port 131 is H, satisfying: For example, U can be 0.18, 0.5, 1, 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 62.4, etc. It should be noted that the working volume generally refers to the remaining volume between the compression cavity and the piston rotatably installed inside the compression cavity. The unit of the working volume is cc, the unit of the diameter is mm, the unit of the included angle is radian, and the unit of the distance is mm. This unit will be used in subsequent embodiments.

[0039] It should be pointed out that when the first suction port 131 is located at the lower end face of the second cylinder 104, along the axial direction of the pump body assembly, the minimum distance H between the center of the enthalpy injection hole 140 and the first suction port 131 refers to the minimum distance between the center of the enthalpy injection hole 140 and the lower end face of the second cylinder 104; when the first suction port 131 is located at the upper end face of the second cylinder 104, along the axial direction of the pump body assembly, the minimum distance H between the center of the enthalpy injection hole 140 and the first suction port 131 refers to the minimum distance between the center of the enthalpy injection hole 140 and the upper end face of the second cylinder 104.

[0040] It should be noted that when V2 / V1 is too small, the working volume V1 of the low-pressure compression chamber 110 is too large, and the high-pressure compression chamber 130 cannot completely consume the refrigerant discharged from the low-pressure compression chamber 110, resulting in excessive performance and a decrease in the volumetric efficiency of the compressor; when V2 / V1 is too large, for the low-temperature heating condition, the working volume V2 of the high-pressure compression chamber 130 is too large, which is equivalent to the working volume of the low-pressure compression chamber 110 being too small, resulting in insufficient suction volume of the high-pressure compression chamber 130 and insufficient heating capacity, and a poor user experience.

[0041] It should be noted that when the minimum diameter D1 of the injection enthalpy hole 140 is too small, the minimum flow area of the injection enthalpy hole 140 is too small, resulting in insufficient gas replenishment in the intermediate chamber 120, too large flow resistance of the refrigerant in the injection enthalpy hole 140, limited improvement in the heating capacity of the compressor, and insignificant improvement in energy efficiency; when the minimum diameter D2 of the injection enthalpy hole 140 is too large, excessive refrigerant is replenished into the intermediate chamber 120, causing the pressure in the intermediate chamber 120 to rise abnormally, the pressure in the high-pressure compression chamber 130 to be too high, and the leakage of the refrigerant in the high-pressure compression chamber 130 to increase, resulting in a decrease in the volumetric efficiency of the compressor.

[0042] It should be noted that when the included angle θ between the center of the injection enthalpy hole 140 and the center of the first suction port 131 corresponding to the axis O1 of the pump body assembly is too large, the distance that the refrigerant moves along the circumferential direction of the pump body assembly increases, the flow time of the refrigerant in the intermediate chamber 120 prolongs, resulting in heat exchange between the refrigerant replenished by the enthalpy-increasing assembly 400 and the high-temperature refrigerant inside the housing 300 of the compressor, overheating of the refrigerant replenished by the enthalpy-increasing assembly 400, affecting the cooling effect of the enthalpy-increasing assembly 400, and a decrease in the performance of the compressor; when the included angle θ between the center of the injection enthalpy hole 140 and the center of the first suction port 131 corresponding to the axis O1 of the pump body assembly is too small, the distance that the refrigerant moves along the circumferential direction of the pump body assembly decreases, the refrigerant inside the intermediate chamber 120 and the refrigerant replenished from the enthalpy-increasing assembly 400 cannot be fully mixed, the refrigerant in the high-pressure compression chamber 130 is locally subcooled or overheated, and the leakage of the refrigerant in the high-pressure compression chamber 130 increases, resulting in a decrease in the volumetric efficiency of the compressor.

[0043] It should be noted that when the minimum distance H between the center of the injection enthalpy hole 140 and the first suction port 131 is too large, the distance that the refrigerant moves along the axial direction of the pump body assembly increases, the flow time of the refrigerant in the intermediate chamber 120 prolongs, resulting in heat exchange between the refrigerant replenished by the enthalpy-increasing assembly 400 and the high-temperature refrigerant inside the housing 300 of the compressor, overheating of the refrigerant replenished by the enthalpy-increasing assembly 400, and a decrease in the performance of the compressor; when the minimum distance H between the center of the injection enthalpy hole 140 and the first suction port 131 is too small, the distance that the refrigerant moves along the axial direction of the pump body assembly decreases, the refrigerant inside the intermediate chamber 120 and the refrigerant replenished from the enthalpy-increasing assembly 400 cannot be fully mixed, the refrigerant in the high-pressure compression chamber 130 is locally subcooled or overheated, and the leakage of the refrigerant in the high-pressure compression chamber 130 increases, resulting in a decrease in the volumetric efficiency of the compressor.

[0044] It can be understood that, on the basis that the working volume V2 of the high-pressure compression chamber 130 and the minimum diameter D1 of the injection enthalpy hole 140 remain unchanged, when U is less than 0.18, the working volume V1 of the low-pressure compression chamber 110 is too large, and the high-pressure compression chamber 130 cannot completely consume the refrigerant discharged from the low-pressure compression chamber 110, resulting in excessive performance. The minimum distance between the center of the injection enthalpy hole 140 and the first suction port 131 is too large, and the angle between the center of the injection enthalpy hole 140 and the center of the first suction port 131 corresponding to the axis O1 of the pump body assembly is too large, which prolongs the flow time of the refrigerant in the intermediate chamber 120, causing the refrigerant replenished by the enthalpy-increasing assembly 400 to exchange heat with the high-temperature refrigerant inside the housing 300 of the compressor, and the refrigerant replenished by the enthalpy-increasing assembly 400 becomes overheated, affecting the cooling effect of the enthalpy-increasing assembly 400. Under the combined influence of the too large working volume V1 of the low-pressure compression chamber 110, the too large minimum distance H between the center of the injection enthalpy hole 140 and the first suction port 131, and the too large angle θ between the center of the injection enthalpy hole 140 and the center of the first suction port 131 corresponding to the axis O1 of the pump body assembly, the performance of the compressor decreases; when U is greater than 62.4, the working volume V1 of the low-pressure compression chamber 110 is too small, the suction volume of the high-pressure compression chamber 130 is insufficient, the angle θ between the center of the injection enthalpy hole 140 and the center of the first suction port 131 corresponding to the axis O1 of the pump body assembly is too small, the minimum distance H between the center of the injection enthalpy hole 140 and the first suction port 131 is too small, the refrigerant inside the intermediate chamber 120 and the refrigerant replenished from the enthalpy-increasing assembly 400 cannot be fully mixed, the refrigerant in the high-pressure compression chamber 130 is locally supercooled or overheated, and the leakage amount of the refrigerant in the high-pressure compression chamber 130 increases, resulting in a decrease in the performance of the compressor. Therefore, by reasonably designing the relationships among the working volume V1 of the low-pressure compression chamber 110, the working volume V2 of the high-pressure compression chamber 130, the minimum diameter D1 of the injection enthalpy hole 140, the angle θ between the center of the injection enthalpy hole 140 and the center of the first suction port 131 corresponding to the axis O1 of the pump body assembly, and the minimum distance H between the center of the injection enthalpy hole 140 and the first suction port 131, the injection enthalpy path of the compressor can be optimized, the flow loss of the refrigerant replenished from the enthalpy-increasing assembly 400 can be reduced, and the gas replenishing amount can be increased, thereby improving the performance of the compressor.

[0045] Refer to Figure 4 , Figure 4This is a relationship diagram of U and the compressor COP for an embodiment of the present invention. The columns in the figure represent the performance improvement amplitude of the compressor at different U values, and the dashed line in the figure represents the fitting curve of the improvement amplitude of the compressor at different U values. As shown in the figure, when the value of U gradually increases, within the range of 0.18 to 62.4, the COP improvement amplitude of the compressor first gradually increases and then decreases. Therefore, by reasonably designing the relationship between the working volume V1 of the low-pressure compression chamber 110, the working volume V2 of the high-pressure compression chamber 130, the minimum diameter D1 of the injection enthalpy hole 140, the angle θ between the center of the injection enthalpy hole 140 and the center of the first suction port 131 corresponding to the axis O1 of the pump body assembly, and the minimum distance H between the center of the injection enthalpy hole 140 and the first suction port 131, the injection enthalpy path of the compressor can be optimized, the amount of supplementary gas can be increased, and thus the performance of the compressor can be improved. It should be noted that during refrigeration, COP refers to the ratio of the refrigeration capacity of the compressor to the input power; during heating, it is COP during refrigeration + 1. The higher the COP value, the higher the efficiency of the compressor and the more power-saving it is.

[0046] As another implementation manner, the injection enthalpy hole 140 can also be provided on the partition assembly 103, the upper bearing 105, the lower bearing 101, or the second cylinder 104, as long as it can facilitate the delivery of the refrigerant by the enthalpy-increasing assembly 400 to the intermediate chamber 120. For example, when the injection enthalpy hole 140 is provided on the partition assembly 103, the refrigerant delivered from the enthalpy-increasing assembly 400 directly enters the intermediate chamber 120 through the injection enthalpy hole 140; when the injection enthalpy hole 140 is provided on the upper bearing 105, the upper bearing 105 is provided with a first through hole, and the injection enthalpy hole 140 communicates with the intermediate chamber 120 through the first through hole. The refrigerant delivered from the enthalpy-increasing assembly 400 passes through the injection enthalpy hole 140 and the first through hole in sequence and finally enters the intermediate chamber 120; when the injection enthalpy hole 140 is provided on the lower bearing 101, the lower bearing 101 is provided with a second through hole, and the injection enthalpy hole 140 communicates with the intermediate chamber 120 through the second through hole. The refrigerant delivered from the enthalpy-increasing assembly 400 passes through the injection enthalpy hole 140 and the second through hole in sequence and finally enters the intermediate chamber 120; when the injection enthalpy hole 140 is provided on the second cylinder 104, the second cylinder 104 is provided with a third through hole, and the injection enthalpy hole 140 communicates with the intermediate chamber 120 through the third through hole. The refrigerant delivered from the enthalpy-increasing assembly 400 passes through the injection enthalpy hole 140 and the third through hole in sequence and finally enters the intermediate chamber 120.

[0047] For example Figure 3 As shown, in the embodiment of the present invention, the low-pressure compression chamber 110 has a second suction port 111, the minimum diameter of the second suction port 111 is D2, and the ratio of the minimum diameter D1 of the injection enthalpy hole 140 to the minimum diameter D2 of the second suction port 111 is D1 / D2, satisfying: 0.2 ≤ D1 / D2 ≤ 1. On the one hand, it can ensure the amount of supplementary gas of the enthalpy-increasing assembly 400, and on the other hand, it can improve the volumetric efficiency of the first cylinder 102, thereby enhancing the performance of the compressor.

[0048] It can be understood that when D1 / D2 is less than 0.2, the minimum diameter D1 of the enthalpy injection hole 140 is too small, resulting in too small minimum flow area of the enthalpy injection hole 140, insufficient air supplement in the intermediate cavity 120, too large refrigerant flow resistance in the enthalpy injection hole 140, limited improvement in the heating capacity of the compressor, and insignificant improvement in energy efficiency; when D1 / D2 is greater than 1, the jet pressure of the enthalpy injection component 400 increases, resulting in an increase in the exhaust pressure of the low-pressure compression cavity 110. The refrigerant in the low-pressure compression cavity 110 is likely to leak from the high-pressure area to the low-pressure area, resulting in a decrease in the volumetric efficiency of the first cylinder 102 and a reduction in the performance of the compressor. Therefore, by reasonably designing the relationship between the minimum diameter D1 of the enthalpy injection hole 140 and the minimum diameter D2 of the second suction port 111, on the one hand, the air supplement amount of the enthalpy injection component 400 can be ensured, and on the other hand, the exhaust pressure of the low-pressure compression cavity 110 can be reduced, and the leakage amount of the refrigerant in the low-pressure compression cavity 110 from the high-pressure area to the low-pressure area can be reduced, which can improve the volumetric efficiency of the first cylinder 102 and thus improve the performance of the compressor.

[0049] In an embodiment of the present invention, the ratio of the working volume of the high-pressure compression cavity 130 to the working volume of the low-pressure compression cavity 110 is V2 / V1, satisfying: 0.4 ≤ V2 / V1 ≤ 0.8. For example, V2 / V1 can be 0.4, 0.5, 0.6, 0.7, 0.8. Taking the working volume V2 of the high-pressure compression cavity 130 as unchanged as an example, when V2 / V1 is less than 0.4, the working volume of the low-pressure compression cavity 110 is too large, and the high-pressure compression cavity 130 cannot completely consume the refrigerant discharged from the low-pressure compression cavity 110, resulting in performance surplus and a decrease in the volumetric efficiency of the compressor; when V2 / V1 is greater than 0.8, for the working condition of low-temperature heating, the working volume of the low-pressure compression cavity 110 is too small, the suction amount of the high-pressure compression cavity 130 is insufficient, the heating capacity of the compressor decreases, and the user experience is poor. Therefore, by reasonably designing the ratio of the working volume of the low-pressure compression cavity 110 to the working volume of the high-pressure compression cavity 130, the suction pulsation and exhaust pulsation can be reduced, the vibration can be reduced, the noise can be reduced, and the volumetric efficiency of the compressor can be improved.

[0050] For example Figure 1 As shown, in an embodiment of the present invention, the partition component 103 includes a first partition 1031 and a second partition 1032. The first partition 1031 and the second partition 1032 are arranged opposite to each other along the axial direction of the pump body component. The first partition 1031 is located below the second partition 1032. A second cavity 122 is formed by enclosing between the first partition 1031 and the second partition 1032. The first partition 1031 is connected to the upper end surface of the first cylinder 102, and the second partition 1032 is connected to the lower end surface of the second cylinder 104. The first partition 1031 and the second partition 1032 can be processed separately, which is beneficial to machining and manufacturing the second cavity 122 on the partition component 103 and can reduce the machining and manufacturing cost of the partition component 103.

[0051] For example, the second cavity 122 has a petal-like structure and is arranged around the axis O1 of the pump body assembly. By dividing the partition assembly 103 into a first partition 1031 and a second partition 1032, the first partition 1031 and the second partition 1032 can be processed separately, which is beneficial to machining the second cavity 122 on the partition assembly 103 and can reduce the manufacturing cost of the partition assembly 103.

[0052] It should be noted that a connection structure is provided between the first partition 1031 and the second partition 1032, and the connection structure is used to connect and fix the first partition 1031 and the second partition 1032. For example, the connection structure includes a connecting member, and the connecting member is a screw or a bolt. The connecting member includes a rod portion and a head at one end of the rod portion. The rod portion passes through the second partition 1032 and is threadedly connected to the first partition 1031, and the head is installed in the second partition 1032, which can facilitate the connection and fixation of the first partition 1031 and the second partition 1032. As another implementation manner, the connecting member is a pin, one end of the connecting member is fixedly connected to the first partition 1031, and the other end of the connecting member is fixedly connected to the second partition 1032, which can also facilitate the connection and fixation of the first partition 1031 and the second partition 1032, and will not be elaborated here.

[0053] It should be pointed out that a plurality of connecting members are arranged around the axis O1 of the pump body assembly, which can increase the connection stability between the first partition 1031 and the second partition 1032, and will not be described in detail here.

[0054] For example Figure 3 As shown, in the embodiment of the present invention, a plurality of communication channels 123 are provided, and the plurality of communication channels 123 are arranged at intervals around the axis O1 of the pump body assembly. By providing a plurality of communication channels 123, the total flow area of the plurality of communication channels 123 is increased, the flow rate of the refrigerant can be reduced, and thus the flow loss can be reduced.

[0055] It can be understood that the more the number of the communication channels 123, the lower the strength in the radial direction of the first cylinder 102. In this embodiment, in order to ensure the strength in the radial direction of the first cylinder 102, the number of the communication channels 123 is configured to be less than or equal to 5, for example, the number of the communication channels 123 is 2, 3, 4, 5, etc.

[0056] As another implementation manner, the number of the communication channels 123 can also be configured to be one, which is not limited here.

[0057] In an embodiment of the present invention, the pump body assembly further includes an upper muffler 107. The upper muffler 107 is connected to the upper bearing 105, and a third cavity 150 is formed between the upper bearing 105 and the upper muffler 107. The exhaust port of the high-pressure compression cavity 130 communicates with the third cavity 150. The refrigerant discharged from the high-pressure compression cavity 130 can enter the third cavity 150 and then be discharged into the inner cavity 310 of the compressor housing 300, which is beneficial to reducing the exhaust noise and improving the user experience.

[0058] The compressor according to the second aspect embodiment of the present invention includes a housing 300, an enthalpy-increasing assembly 400, and the pump body assembly of the above embodiment. The housing 300 has an inner cavity 310. The enthalpy-increasing assembly 400 is installed outside the housing 300. The enthalpy-increasing assembly 400 includes an intake pipe 410. The intake pipe 410 penetrates into the housing 300 and is fixedly connected to the pump body assembly. The pump body assembly is installed in the inner cavity 310. By adopting the pump body assembly of the above embodiment, when the pump body assembly works, the refrigerant outside the pump body assembly is sucked into the low-pressure compression cavity 110 from the second suction port 111. The refrigerant completes the first-stage compression in the low-pressure compression cavity 110. Then, the refrigerant is discharged into the intermediate cavity 120. The refrigerant in the intermediate cavity 120 is sucked into the high-pressure compression cavity 130 from the first suction port 131. The refrigerant completes the second-stage compression in the high-pressure compression cavity 130. The enthalpy-increasing assembly 400 can deliver refrigerant to the intermediate cavity 120 through the enthalpy injection hole 140. After the low-pressure compression cavity 110 compresses the refrigerant, it will discharge the refrigerant into the intermediate cavity 120. The refrigerant delivered by the enthalpy-increasing assembly 400 to the intermediate cavity 120 can be mixed with the refrigerant in the intermediate cavity 120, and finally enter the interior of the high-pressure compression cavity 130 together through the first suction port 131. The intermediate cavity 120 can make the refrigerant inside it and the refrigerant supplemented from the enthalpy-increasing assembly 400 fully mixed, reduce the problem of excessive pulsation when the two refrigerant streams are mixed, and improve the cooling effect of the refrigerant. Since the working volume of the low-pressure compression cavity 110 is V1, the working volume of the high-pressure compression cavity 130 is V2, the minimum diameter of the enthalpy injection hole 140 is D1, the angle between the center of the enthalpy injection hole 140 and the center of the first suction port 131 corresponding to the axis O1 of the pump body assembly is θ, and along the axial direction of the pump body assembly, the minimum distance between the center of the enthalpy injection hole 140 and the first suction port 131 is H, it satisfies: When U is less than 0.18, the working volume V1 of the low-pressure compression chamber 110 is too large, and the high-pressure compression chamber 130 cannot completely consume the refrigerant discharged from the low-pressure compression chamber 110, resulting in excessive performance. The minimum distance between the center of the injection enthalpy hole 140 and the first suction port 131 is too large, and the angle θ between the center of the injection enthalpy hole 140 and the center of the first suction port 131 corresponding to the axis O1 of the pump body assembly is too large, prolonging the flow time of the refrigerant in the intermediate chamber 120. As a result, the refrigerant replenished by the enthalpy-increasing assembly 400 exchanges heat with the high-temperature refrigerant inside the housing 300 of the compressor, causing the refrigerant replenished by the enthalpy-increasing assembly 400 to overheat and affecting the cooling effect of the enthalpy-increasing assembly 400. Under the combined influence of the large working volume V1 of the low-pressure compression chamber 110, the large minimum distance H between the center of the injection enthalpy hole 140 and the first suction port 131, and the large angle θ between the center of the injection enthalpy hole 140 and the center of the first suction port 131 corresponding to the axis O1 of the pump body assembly, the performance of the compressor decreases; when U is greater than 62.4, the working volume V1 of the low-pressure compression chamber 110 is too small, the suction volume of the high-pressure compression chamber 130 is insufficient, the angle θ between the center of the injection enthalpy hole 140 and the center of the first suction port 131 corresponding to the axis O1 of the pump body assembly is too small, the minimum distance H between the center of the injection enthalpy hole 140 and the first suction port 131 is too small, the refrigerant inside the intermediate chamber 120 and the refrigerant replenished from the enthalpy-increasing assembly 400 cannot be fully mixed, the refrigerant in the high-pressure compression chamber 130 is locally supercooled or overheated, and the leakage amount of the refrigerant in the high-pressure compression chamber 130 increases, resulting in a decrease in the performance of the compressor. Therefore, by reasonably designing the relationship between the working volume of the low-pressure compression chamber 110 V1 , the working volume V2 of the high-pressure compression chamber 130, the minimum diameter D1 of the injection enthalpy hole 140, the angle θ between the center of the injection enthalpy hole 140 and the center of the first suction port 131 corresponding to the axis O1 of the pump body assembly, and the minimum distance H between the center of the injection enthalpy hole 140 and the first suction port 131, the injection enthalpy path of the compressor can be optimized, the flow loss of the refrigerant replenished from the enthalpy-increasing assembly 400 can be reduced, the gas replenishment amount can be increased, and thus the performance of the compressor can be improved.

[0059] It should be noted that the gaseous refrigerant used for gas replenishment by the enthalpy-increasing assembly 400 can be provided by a flash evaporator, and the flash evaporator 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 and changes from all-liquid refrigerant to gas-liquid mixed refrigerant under the action of the first throttling device. The gas-liquid mixed refrigerant then enters the flash evaporator, and the gaseous refrigerant flows along the gas outlet of the flash evaporator to the first enthalpy-increasing assembly 400. The liquid refrigerant flows out from the liquid outlet of the flash evaporator, passes through the second throttling device and then enters the evaporator, and finally the refrigerant after absorbing heat enters the low-pressure compression chamber 110 through the liquid receiver. In another embodiment of the present invention, the flash evaporator can also be replaced by a plate heat exchanger, that is, the refrigerant used for gas replenishment by the enthalpy-increasing assembly 400 can also be provided by the plate heat exchanger, and a suitable scheme is selected according to the actual situation.

[0060] In an embodiment of the present invention, the check mechanism is an exhaust valve seat, and the exhaust valve seat is installed at one end of the injection enthalpy hole 140 away from the intake pipe 410. The exhaust valve seat includes a valve plate covering the injection enthalpy hole 140 and a lift limiter. The refrigerant ejected by the enthalpy-increasing assembly 400 can push the valve plate to separate from the injection enthalpy hole 140, so as to enter the intermediate cavity 120. The lift limiter is used to limit the lifting height of the valve plate. At the same time, the lift limiter also has the function of guiding the movement direction of the valve plate, reducing the situation of misalignment and deflection of the valve plate. When the pressure of the refrigerant in the intermediate cavity 120 is less than the jet pressure of the enthalpy-increasing assembly 400, under the action of the jet pressure of the enthalpy-increasing assembly 400, the valve plate can open the injection enthalpy hole 140; when the pressure of the refrigerant in the intermediate cavity 120 is greater than the jet pressure of the enthalpy-increasing assembly 400, under the action of the pressure of the refrigerant in the intermediate cavity 120, the valve plate can seal the injection enthalpy hole 140, thereby reducing the situation of refrigerant entering the enthalpy-increasing assembly 400 through the injection enthalpy hole 140. Therefore, the situation of refrigerant reflux can be effectively improved to increase the intake volume of the high-pressure compression cavity 130.

[0061] As another embodiment, the check mechanism is a one-way valve. The one-way valve is installed on the side of the intake pipe 410 adjacent to the intermediate cavity 120. The one-way valve includes a valve seat, an elastic member and a valve core. The valve seat is provided with a passage. The valve core is detachably engaged with the valve seat to open or close the passage. The elastic member is arranged between the valve seat and the valve core. The elastic member can apply a force to the valve core to make the valve core engage with the valve seat. When the valve core engages with the valve seat, the passage is disconnected. When the valve core separates from the valve seat, the passage is opened. When the sum of the pressure of the refrigerant in the intermediate cavity 120 and the acting force of the elastic member is less than the jet pressure of the enthalpy-increasing assembly 400, the passage is opened. When the sum of the pressure of the refrigerant in the intermediate cavity 120 and the acting force of the elastic member is greater than the jet pressure of the enthalpy-increasing assembly 400, under the action of the pressure of the refrigerant in the intermediate cavity 120 and the acting force of the elastic member, the passage is closed, thereby reducing the situation of refrigerant entering the enthalpy-increasing assembly 400 through the injection enthalpy hole 140. Therefore, the situation of refrigerant reflux can be effectively improved to increase the intake volume of the high-pressure compression cavity 130.

[0062] In an embodiment of the present invention, the upper bearing 105 is fixedly connected to the inner peripheral surface of the inner cavity 310, or the first cylinder 102 and / or the second cylinder 104 is fixedly connected to the inner peripheral surface of the inner cavity 310. The fixed connection method can adopt welding or interference fit. Among them, the welding method includes but is not limited to resistance welding and laser welding.

[0063] In an embodiment of the present invention, the compressor further includes a motor assembly 500. The motor assembly 500 includes a stator 510 and a rotor 520 rotatably arranged in the stator 510. The outer peripheral surface of the rotor 520 abuts against the inner peripheral surface of the housing 300. The rotor 520 is fixedly connected to the upper end of the crankshaft 200. The stator 510 drives the crankshaft 200 to rotate through the rotor 520.

[0064] Since the compressor adopts all the technical solutions of the pump body assembly 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 elaborated here.

[0065] The refrigeration equipment according to the third aspect embodiment of the present invention includes the compressor of the above embodiment. The refrigeration equipment can be central air conditioners, integrated air conditioners, split air conditioners, air duct machines, window air conditioners and other equipment.

[0066] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the scope of knowledge possessed by those of ordinary skill in the art.

Claims

1. A pump assembly, characterized in that: A low-pressure compression chamber, an intermediate chamber and a high-pressure compression chamber are provided, the high-pressure compression chamber has a first air intake port, the exhaust port of the low-pressure compression chamber is connected to the first air intake port through the intermediate chamber, the intermediate chamber has an enthalpy injection hole, and the enthalpy injection hole is used for the enthalpy increase component to transport refrigerant to the intermediate chamber; The working volume of the low-pressure compression chamber is V1, the working volume of the high-pressure compression chamber is V2, the minimum diameter of the spray enthalpy hole is D1, the angle between the center of the spray enthalpy hole and the center of the first air intake port corresponding to the axis of the pump body assembly is θ, and the minimum distance between the center of the spray enthalpy hole and the first air intake port along the axial direction of the pump body assembly is H, satisfying: U = (V2 × D1 2 ) / (V1×H×θ), 0.18≤U≤62.

4.

2. The pump assembly according to claim 1, characterized in that: The low-pressure compression chamber has a second air intake port, and the minimum diameter of the second air intake port is D2, which satisfies: 0.2≤D1 / D2≤1.

3. The pump assembly according to claim 1, characterized in that: The ratio of the working volume of the high-pressure compression chamber to the working volume of the low-pressure compression chamber is V2 / V1, which satisfies: 0.4≤V2 / V1≤0.

8.

4. The pump assembly according to claim 1, characterized in that: The pump body assembly includes a lower bearing, a first cylinder, a partition assembly, a second cylinder and an upper bearing connected in sequence, the lower bearing, the first cylinder and the partition assembly enclose the low-pressure compression chamber, the upper bearing, the second cylinder and the partition assembly enclose the high-pressure compression chamber, the partition assembly is provided with the intermediate chamber, and at least one of the lower bearing, the first cylinder, the partition assembly, the second cylinder and the upper bearing is provided with the spray enthalpy hole.

5. The pump assembly according to claim 1, characterized in that: The pump body assembly includes a lower bearing, a first cylinder, a partition assembly, a second cylinder and an upper bearing connected in sequence, the low-pressure compression chamber is located in the first cylinder, the high-pressure compression chamber is located in the second cylinder, the lower bearing is provided with a lower muffler, the lower bearing and the lower muffler are enclosed to form a first cavity, the partition assembly is provided with a second cavity, the first cylinder is provided with a connecting passage, the first cavity, the second cavity and the connecting passage constitute the intermediate cavity, the first cavity and the second cavity are connected through the connecting passage, and at least one of the lower bearing, the first cylinder, the partition assembly, the second cylinder and the upper bearing is provided with the spray enthalpy hole.

6. The pump assembly according to claim 4 or 5, characterized in that: The partition assembly includes a first partition and a second partition arranged opposite to each other along the axial direction of the pump body assembly, the first partition is connected to the upper end surface of the first cylinder, the second partition is connected to the lower end surface of the second cylinder, and the first partition and the second partition enclose at least part of the intermediate cavity.

7. The pump assembly according to claim 5, characterized in that: There are a plurality of the communication channels, and the plurality of the communication channels are arranged around the axis of the pump body assembly, and two ends of each of the communication channels are respectively connected to the first cavity and the second cavity.

8. A compressor, characterized in that: include: A shell, an enthalpy increasing component and a pump body component as described in any one of claims 1 to 7, wherein the pump body component is installed in the shell, the enthalpy increasing component is installed outside the shell, and the enthalpy increasing component includes an air intake pipe, which penetrates into the shell and is fixedly connected to the pump body component.

9. The compressor according to claim 8, characterized in that: The compressor further comprises a check mechanism, which is used to prevent the refrigerant from flowing back from the intermediate cavity to the enthalpy increasing component.

10. The compressor according to claim 9, characterized in that: The non-return mechanism is a one-way valve, and the one-way valve is installed on a side of the air inlet pipe adjacent to the middle cavity; or, The non-return mechanism is an exhaust valve seat, and the exhaust valve seat is installed at one end of the spray enthalpy hole away from the intake pipe.

11. Refrigeration equipment, characterized in that: A compressor comprising the compressor according to any one of claims 8 to 10.

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