CN117345629A

CN117345629A - Pump body assembly, compressor and refrigeration equipment

Info

Publication number: CN117345629A
Application number: CN202311387578.2A
Authority: CN
Inventors: 赵文钊; 吴多更; 童为政; 罗剑营
Original assignee: Guangdong Meizhi Compressor Co Ltd; Guangdong Meizhi Precision Manufacturing Co Ltd
Current assignee: Guangdong Meizhi Compressor Co Ltd; Guangdong Meizhi Precision Manufacturing Co Ltd
Priority date: 2023-10-24
Filing date: 2023-10-24
Publication date: 2024-01-05

Abstract

The invention discloses a pump body assembly, a compressor and refrigeration equipment, and relates to the technical field of compressors, wherein the pump body assembly is provided with a low-pressure compression cavity, a middle cavity and a high-pressure compression cavity which are communicated with each other, a refrigerant is discharged to the middle cavity after being compressed at one stage by the low-pressure compression cavity, and then enters the high-pressure compression cavity to be compressed at two stages by the middle cavity, so that the pressure of the finally discharged refrigerant is improved, and the heating capacity or the refrigerating capacity of the compressor in a low-temperature environment are improved. The middle cavity comprises at least two cavities connected through a communication channel, the volume ratio of two adjacent cavities is a, and the following conditions are satisfied: a is more than or equal to 0.2 and less than or equal to 5. Through the volume size of two adjacent cavitys of rational design, can make the refrigerant get into the amplitude of pressure variation when another cavity from a cavity and reduce to reduce the pulsation condition, reduce the flow loss of refrigerant, improve the air suction volume of high-pressure compression chamber, and then promote the performance of compressor.

Description

Pump body assembly, compressor and refrigeration equipment

Technical Field

The invention relates to the technical field of compressors, in particular to a pump body assembly, a compressor and refrigeration equipment.

Background

In the related art, in order to make the compressor play a better role in occasions such as high-temperature refrigeration or low-temperature heating, the compressor can compress the refrigerant in a two-stage or multi-stage compression mode, so that the compressor has higher volumetric efficiency. The pump body assembly, such as a compressor, has a low pressure compression chamber and a high pressure compression chamber, with the low pressure compression chamber communicating through an intermediate chamber and the high pressure compression chamber. Because the pressure change amplitude of the refrigerant entering the high-pressure compression cavity from the low-pressure compression cavity through the middle cavity is overlarge, pulsation is easy to generate when the pump body component compresses the refrigerant, and the energy efficiency of the compressor is reduced.

Disclosure of Invention

The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, the invention provides the pump body assembly, the middle cavity comprises a plurality of cavities, and the pulsation condition is reduced, the flow loss of the refrigerant is reduced, the air suction amount of the high-pressure compression cavity is improved, and the performance of the compressor is further improved by reasonably designing the volume between two adjacent cavities.

The invention also provides a compressor and refrigeration equipment with the pump body assembly.

According to the pump body assembly provided by the embodiment of the first aspect of the invention, a low-pressure compression cavity, an intermediate cavity and a high-pressure compression cavity are arranged, and an exhaust port of the low-pressure compression cavity is communicated with an air inlet of the high-pressure compression cavity through the intermediate cavity; the middle cavity comprises at least two cavities and a communication channel for communicating two adjacent cavities, wherein the volume ratio of the two adjacent cavities is a, and the following conditions are satisfied: a is more than or equal to 0.2 and less than or equal to 5.

The pump body assembly provided by the embodiment of the invention has at least the following beneficial effects:

through set up low pressure compression chamber, intermediate chamber and high pressure compression chamber at pump body subassembly, the gas vent in low pressure compression chamber passes through intermediate chamber and the air inlet intercommunication in high pressure compression chamber, consequently the refrigerant is discharged to intermediate chamber after low pressure compression chamber one-level compression, and the rethread intermediate chamber gets into high pressure compression chamber and carries out the second grade compression, and then improves final exhaust refrigerant pressure, is favorable to promoting the refrigerating capacity of compressor under the heating or the high temperature environment of low temperature environment. Since the pulsation is inversely proportional to the volume, i.e. the larger the volume, the smaller the pulsation. Therefore, the middle cavity comprises at least two cavities connected through the communication channel, and the volume of the middle cavity can be increased, so that the influence caused by pulsation is reduced. The volume ratio of two adjacent cavities is a, and the following conditions are satisfied: a is more than or equal to 0.2 and less than or equal to 5. If a is less than 0.2 or more than 5, that is, the difference between the volumes of two adjacent cavities is too large, the pressure variation amplitude of the refrigerant from one cavity to the other cavity is increased, and pulsation is easily generated. Through the volume size of two adjacent cavitys of rational design, can make the refrigerant get into the amplitude of pressure variation when another cavity from a cavity and reduce to reduce the pulsation condition, reduce the flow loss of refrigerant, improve the air suction volume of high-pressure compression chamber, and then promote the performance of compressor.

According to some embodiments of the invention, the pump body assembly comprises an upper bearing, a second cylinder, a partition member, a first cylinder and a lower bearing connected in sequence, an upper muffler connected to the upper bearing and a lower muffler connected to the lower bearing, the cavity of the intermediate chamber being located at least one of: within the separator member; between the lower bearing and the lower muffler; the upper bearing and the upper silencer are arranged between the upper bearing and the upper silencer; the lower bearing and the first cover plate are covered between the lower end face of the lower bearing; the upper bearing and the second cover plate are covered between the upper end face of the upper bearing.

According to some embodiments of the invention, the low pressure compression chamber is disposed within the first cylinder and the high pressure compression chamber is disposed within the second cylinder.

According to some embodiments of the invention, the volume ratio a of two adjacent cavities satisfies: a is more than or equal to 0.5 and less than or equal to 2.

According to some embodiments of the invention, the pump body assembly comprises a partition plate, a lower bearing and a lower silencer, wherein the partition plate, the lower bearing and the lower silencer are connected, the lower bearing is provided with a first exhaust hole, a first cavity of the middle cavity is formed between the lower bearing and the lower silencer, the low-pressure compression cavity is communicated with the first cavity through the first exhaust hole, a second cavity of the middle cavity is arranged in the partition plate, and the first cavity and the second cavity are communicated through the communication channel.

According to some embodiments of the invention, the pump body assembly comprises a first cylinder, a partition member and a second cylinder which are connected, wherein the middle cavity is arranged in the partition member, and the middle cavity is provided with a plurality of cavities which are arranged along the circumferential direction of the partition member.

A compressor according to a second aspect of the present invention includes a housing and the pump body assembly described in the above embodiments, the pump body assembly being disposed in the housing.

The compressor provided by the embodiment of the invention has at least the following beneficial effects:

adopt the pump body subassembly of first aspect embodiment, pump body subassembly is through setting up low pressure compression chamber, intermediate chamber and high pressure compression chamber, and the gas vent in low pressure compression chamber passes through the air inlet intercommunication in intermediate chamber and high pressure compression chamber, therefore the refrigerant is discharged to intermediate chamber after low pressure compression chamber one-level compression, and the rethread intermediate chamber gets into high pressure compression chamber and carries out the second grade compression, and then improves final exhaust refrigerant pressure, is favorable to promoting the refrigerating capacity of compressor under the heating or the high temperature environment of low temperature environment. Since the pulsation is inversely proportional to the volume, i.e. the larger the volume, the smaller the pulsation. Therefore, the middle cavity comprises at least two cavities connected through the communication channel, and the volume of the middle cavity can be increased, so that the influence caused by pulsation is reduced. The volume ratio of two adjacent cavities is a, and the following conditions are satisfied: a is more than or equal to 0.2 and less than or equal to 5. If a is less than 0.2 or more than 5, that is, the difference between the volumes of two adjacent cavities is too large, the pressure variation amplitude of the refrigerant from one cavity to the other cavity is increased, and pulsation is easily generated. Through the volume size of two adjacent cavitys of rational design, can make the refrigerant get into the amplitude of pressure variation when another cavity from a cavity and reduce to reduce the pulsation condition, reduce the flow loss of refrigerant, improve the air suction volume of high-pressure compression chamber, and then promote the performance of compressor.

According to some embodiments of the invention, the compressor further comprises a first enthalpy increasing assembly connected to the intermediate chamber, the first enthalpy increasing assembly being for delivering refrigerant to the intermediate chamber.

According to some embodiments of the invention, the compressor further comprises a second enthalpy increasing assembly connected to the low pressure compression chamber or the high pressure compression chamber, the second enthalpy increasing assembly being for delivering refrigerant to the low pressure compression chamber or the high pressure compression chamber.

According to an embodiment of the third aspect of the present invention, a compressor includes a housing; the pump body assembly is arranged in the shell and is provided with a low-pressure compression cavity, a high-pressure compression cavity and at least one fourth cavity; the middle pressure shell is connected to the outside of the shell, a fifth cavity is arranged in the middle pressure shell, and the fifth cavity and at least one fourth cavity are sequentially communicated and jointly form an intermediate cavity communicated between an exhaust port of the low pressure compression cavity and an air inlet of the high pressure compression cavity; the volume ratio of the fifth cavity to the fourth cavity which are adjacent is b, and the following conditions are satisfied: b is more than or equal to 0.2 and less than or equal to 5.

through setting up low pressure compression chamber, intermediate chamber and high pressure compression chamber at the pump body subassembly, the gas vent in low pressure compression chamber passes through intermediate chamber and high pressure compression chamber's air inlet intercommunication, consequently the refrigerant is discharged to the intermediate chamber after low pressure compression chamber one-level compression. The volume ratio of the adjacent fifth cavity to the fourth cavity is b, and the following conditions are satisfied: b is more than or equal to 0.2 and less than or equal to 5. If b is less than 0.2 or more than 5, that is, the difference between the volumes of the adjacent two chambers is too large, the pressure variation amplitude of the refrigerant from one chamber to the other chamber is increased, and pulsation is easily generated. Through the volume size of two adjacent cavitys of rational design, can make the refrigerant get into the amplitude of pressure variation when another cavity from a cavity and reduce to reduce the pulsation condition, reduce the flow loss of refrigerant, improve the air suction volume of high-pressure compression chamber, and then promote the performance of compressor.

A refrigeration appliance according to an embodiment of a fourth aspect of the present invention includes the compressor described in the above embodiment.

by adopting the compressor of the embodiment of the second aspect or the third aspect, the compressor is provided with the low-pressure compression cavity, the middle cavity and the high-pressure compression cavity in the pump body assembly, and the exhaust port of the low-pressure compression cavity is communicated with the air inlet of the high-pressure compression cavity through the middle cavity, so that the refrigerant is discharged to the middle cavity after being compressed by one stage in the low-pressure compression cavity. The volume ratio of the adjacent fifth cavity to the fourth cavity is b, and the following conditions are satisfied: b is more than or equal to 0.2 and less than or equal to 5. If b is less than 0.2 or more than 5, that is, the difference between the volumes of the adjacent two chambers is too large, the pressure variation amplitude of the refrigerant from one chamber to the other chamber is increased, and pulsation is easily generated. Through the volume size of two adjacent cavitys of rational design, can make the refrigerant get into the amplitude of pressure variation when another cavity from a cavity and reduce to reduce the pulsation condition, reduce the flow loss of refrigerant, improve the air suction volume of high-pressure compression chamber, and then promote the performance of compressor.

Additional aspects and advantages of the 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.

Drawings

The invention is further described with reference to the accompanying drawings and examples, in which:

FIG. 1 is a schematic view showing a structure of a compressor according to an embodiment of the present invention;

FIG. 2 is a cross-sectional view of a compressor according to an embodiment of the present invention;

FIG. 3 is a schematic cross-sectional view of a pump body assembly according to one embodiment of the present invention;

FIG. 4 is a cross-sectional view of a compressor according to another embodiment of the present invention;

FIG. 5 is a cross-sectional view of a compressor according to another embodiment of the present invention;

fig. 6 is a sectional view of a compressor according to another embodiment of the present invention.

Reference numerals:

a compressor 1000;

a pump body assembly 100; a first cylinder 110; low pressure compression chamber 111; a lower bearing 120; a lower muffler 130; a first cavity 131; a communication passage 140; an upper bearing 150; a second cylinder 160; a high-pressure compression chamber 161; an upper muffler 170; a third cavity 171; a medium pressure housing 180; a fourth cavity 181; a fifth cavity 182; a first conduit 183; a second conduit 184; a divider member 190; a second cavity 191; an upper partition 192; a lower partition 193; an intermediate chamber 194;

a housing 200; a lumen 210; an outlet pipe 220;

a reservoir 300; an exhaust pipe 310;

a motor assembly 400; a stator 410; a rotor 420; a crankshaft 430; a first piston 431; a second piston 432;

a first enthalpy increasing assembly 500;

second enthalpy increasing assembly 600.

Detailed Description

Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.

In the description of the present invention, it should be understood that the direction or positional relationship indicated with respect to the description of the orientation, such as up, down, etc., is based on the direction or positional relationship shown in the drawings, is merely for convenience of describing the present invention and simplifying the description, and does not indicate or imply that the apparatus or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.

In the description of the present invention, plural means two or more. The description of the first and second is for the purpose of distinguishing between technical features only and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present invention, unless explicitly defined otherwise, terms such as arrangement, installation, connection, etc. should be construed broadly and the specific meaning of the terms in the present invention can be reasonably determined by a person skilled in the art in combination with the specific contents of the technical scheme.

The compressor can be used for refrigerating equipment or heating equipment, such as heat pump water heater, air conditioner and the like, and can compress low-temperature and low-pressure refrigerant into high-temperature and high-pressure refrigerant to provide power for the circulation of the refrigerating system. The compressor can adopt multistage compression mode to compress refrigerant, and multistage compression can make the compressor possess higher volumetric efficiency, improves pump body subassembly exhaust refrigerant pressure for the compressor also can play better effect in the occasion of low temperature heating, high temperature refrigeration.

For example, referring to fig. 1 and 2, a compressor 1000 according to an embodiment of the present invention includes a housing 200, a pump body assembly 100, a motor assembly 400, and a liquid reservoir 300, wherein the housing 200 has an inner cavity 210, and an air outlet pipe 220 for discharging air is provided at an upper end of the housing 200. The pump body assembly 100 is installed inside the inner cavity 210, and the reservoir 300 is located outside the housing 200 and connected to the pump body assembly 100 through the exhaust pipe 310. The motor assembly 400 includes a stator 410 and a rotor 420, the stator 410 being fixedly coupled to an inner wall of the housing 200, the rotor 420 being positioned between the stators 410.

Referring to fig. 3, the pump body assembly 100 includes a lower bearing 120, a first cylinder 110, a diaphragm member 190, a second cylinder 160, an upper bearing 150, and a crankshaft 430. The motor assembly 400 is used for driving the crankshaft 430 to rotate, and along the axial direction of the crankshaft 430, the crankshaft 430 comprises a first eccentric part and a second eccentric part which are arranged at intervals, the first eccentric part is sleeved with a first piston 431, and the second eccentric part is sleeved with a second piston 432. The lower bearing 120 is connected to a lower end surface of the first cylinder 110, the first cylinder 110 is formed with a low pressure compression chamber 111, the first piston 431 is rotatably disposed in the low pressure compression chamber 111, and the reservoir 300 is connected to the first cylinder 110. The partition member 190 is provided on a side of the first cylinder 110 facing away from the lower bearing 120, and the second cylinder 160 is connected to a side of the partition member 190 facing away from the first cylinder 110, the partition member 190 having a function of partitioning the first cylinder 110 and the second cylinder 160. The second cylinder 160 is formed with a high pressure compression chamber 161, and the second piston 432 is rotatably disposed in the high pressure compression chamber 161. The pump body assembly 100 is provided with an intermediate chamber 194, and the exhaust port of the low-pressure compression chamber 111 communicates with the intake port of the high-pressure compression chamber 161 through the intermediate chamber 194. The upper bearing 150 is connected to the upper end surface of the second cylinder 160, and the crankshaft 430 is inserted through the upper bearing 150 and the lower bearing 120, so as to reduce friction force when the crankshaft 430 rotates, and ensure stable operation of the crankshaft 430.

Therefore, when the compressor 1000 is operated, the refrigerant having a low temperature and a low pressure enters the accumulator 300. The liquid reservoir 300 can reduce the liquid refrigerant from entering the pump body assembly 100, so as not to cause liquid impact. The gaseous refrigerant enters the low pressure compression chamber 111 through the discharge pipe 310 of the accumulator 300. When the crankshaft 430 rotates, the first piston 431 is driven to rotate in the low-pressure compression cavity 111, so that the low-temperature low-pressure refrigerant is compressed at one stage, then is discharged to the middle cavity 194 through the exhaust port of the low-pressure compression cavity 111, enters the high-pressure compression cavity 161 from the middle cavity 194 for two-stage compression, finally enters the inner cavity 210 of the shell 200, is further heated by the stator 410 and the rotor 420, becomes the high-temperature high-pressure refrigerant, and is finally discharged from the air outlet pipe 220 of the shell 200. By adopting the two-stage compression mode, the pressure of the refrigerant can be increased, so that the compressor 1000 can play a good role in low-temperature heating and high-temperature refrigeration.

Since low-pressure compression chamber 111 is intermittently and discontinuously discharged, it has a relatively remarkable pulsation characteristic, and the influence on the suction of the subsequent stage is large. In order to reduce pulsation of the compressor 1000, the pump body assembly 100 of one embodiment of the present invention is provided with a low pressure compression chamber 111, an intermediate chamber 194 and a high pressure compression chamber 161, and an exhaust port of the low pressure compression chamber 111 is communicated with an intake port of the high pressure compression chamber 161 through the intermediate chamber 194. Since the pulsation is inversely proportional to the volume, i.e. the larger the volume, the smaller the pulsation. The intermediate chamber 194 thus includes at least two chambers, adjacent chambers being communicated through the communication channel 140, the volume of the intermediate chamber 194 can be increased, thereby reducing the influence of pulsation. Wherein, the volume ratio of two adjacent cavities is a, satisfies: 0.2.ltoreq.a.ltoreq.5, e.g. a=0.5, a=1.5, a=2, a=3. If a is smaller than 0.2 or larger than 5, the difference between the volumes of the adjacent two cavities is too large, which results in an increase in the pressure variation amplitude of the refrigerant from one cavity to the other, and pulsation is liable to occur. Therefore, the volume of each two adjacent cavities is reasonably designed to reduce the pressure change amplitude of the refrigerant when the refrigerant enters the other cavity from one cavity, thereby reducing the pulsation condition, reducing the flow loss of the refrigerant, improving the air suction amount of the high-pressure compression cavity 161 and further improving the performance of the compressor 1000.

In an embodiment of the present invention, the intermediate chamber 194 may include two chambers, the first chamber 131 and the second chamber 191, respectively. For example, referring to fig. 2 and 3, the pump body assembly 100 further includes a lower muffler 130, the lower muffler 130 is connected with the lower bearing 120, and a first cavity 131 is formed between the lower muffler 130 and the lower bearing 120. The lower bearing 120 is provided with a first exhaust hole through which the low pressure compression chamber 111 communicates with the first chamber 131. The partition member 190 includes an upper partition 192 and a lower partition 193, the upper partition 192 is fixedly connected to the lower end surface of the second cylinder 160, and the lower partition 193 is fixedly connected to the upper end surface of the first cylinder 110. The upper partition plate 192 is provided with a groove on a side facing the lower partition plate 193, and a second cavity 191 is formed by enclosing between a wall surface of the groove and a wall surface of the lower partition plate 193 on a side facing the upper partition plate 192, and the first cavity 131 and the second cavity 191 are communicated through the communication channel 140, so that the volume of the intermediate cavity 194 can be increased, and the influence caused by pulsation can be reduced.

In the embodiment of the present invention, the arrangement manner of the plurality of cavities may be: the volume of the chamber adjacent to the high-pressure compression chamber 161 is smaller than the volume of the chamber adjacent to the low-pressure compression chamber 111. For example, the refrigerant discharged from the low pressure compression chamber 111 sequentially passes through the first chamber 131 and the second chamber 191, and finally enters the high pressure compression chamber 161. That is, the volume of the first chamber 131 is larger than the volume of the second chamber 191 in the flow direction of the refrigerant. In another embodiment, the volume of the chamber near the high-pressure compression chamber 161 may be larger than the volume of the chamber near the low-pressure compression chamber 111. For example, in order to improve the discharge efficiency, the refrigerant in the low-pressure compression chamber 111 is discharged to both the first chamber 131 and the second chamber 191, and since the first chamber 131 is located below the first cylinder 110, the refrigerant needs to flow upward to the second chamber 191, and the flow path is long and the loss is large. In order to balance the exhaust gas in the upward and downward directions, i.e., in the flow direction of the refrigerant, the volume of the first chamber 131 is smaller than the volume of the second chamber 191. In another embodiment, the volumes of the plurality of cavities may also have no distribution rule along the flow direction of the refrigerant, and a suitable scheme is specifically selected according to the actual situation.

In another embodiment of the present invention, the partition member 190 may be provided with a plurality of cavities arranged in the circumferential direction of the partition member 190. One of the chambers of the intermediate chamber 194 is located between the lower bearing 120 and the first cover plate capped on the lower end surface of the lower bearing 120, that is, the lower bearing 120 is isolated from the area of the space enclosed by the lower bearing 120 and the lower muffler 130 by the first cover plate. One of the cavities of the intermediate cavity 194 may also be located between the upper bearing 150 and a second cover plate sealed on the upper end surface of the upper bearing 150, that is, the upper bearing 150 is isolated from an exhaust cavity formed by enclosing the upper bearing 150 and the upper muffler 170 by the second cover plate, and specifically, the number and the setting positions of the cavities included in the intermediate cavity 194 are selected according to practical situations.

Referring to fig. 3, in the embodiment of the present invention, the pump body assembly 100 further includes an upper muffler 170, the upper muffler 170 is connected to the upper bearing 150, and a third cavity 171 is formed between the upper muffler 170 and the upper bearing 150. The upper bearing 150 is provided with a second exhaust hole through which the high pressure compression chamber 161 communicates with the third chamber 171, so that the high pressure compression chamber 161 can discharge the compressed refrigerant to the third chamber 171 and finally into the inner chamber 210 of the housing 200. The upper silencer 170 can reduce noise during refrigerant discharge and improve the use experience of users.

In order to increase the displacement of the compressor 1000 to increase the capacity of the compressor 1000 for cooling in a high temperature environment or heating in a low temperature environment, referring to fig. 5, in an embodiment of the present invention, the compressor 1000 further includes a first enthalpy increasing assembly 500, and the first enthalpy increasing assembly 500 communicates with the intermediate chamber 194. The first enthalpy-increasing component 500 plays a role in supplementing air, can convey the refrigerant into the intermediate chamber 194, and reduces the temperature of the refrigerant by mixing the refrigerant with the original refrigerant in the intermediate chamber 194, thereby reducing the force required by the high-pressure compression chamber 161 for compressing the refrigerant.

Referring to fig. 6, in the embodiment of the present invention, the compressor 1000 further includes a second enthalpy increasing assembly 600, and the second enthalpy increasing assembly 600 is connected to the low pressure compression chamber 111 through a first passage, thereby delivering a refrigerant into the low pressure compression chamber 111 to increase the discharge amount of the low pressure compression chamber 111. In another embodiment of the present invention, the second enthalpy-increasing component 600 may be further connected to the high-pressure compression chamber 161, where the second enthalpy-increasing component 600 is used for delivering refrigerant into the high-pressure compression chamber 161 to increase the displacement of the high-pressure compression chamber 161, so as to further increase the capacity of the compressor 1000 for low-temperature heating or high-temperature refrigeration.

In an embodiment of the present invention, the gaseous refrigerant for supplementing air of the first enthalpy increasing component 500 may be provided through a flash evaporator, which is disposed in a circulation loop of a refrigeration system or a heating system. Taking a heating system as an example: after the liquid refrigerant releases heat through the condenser, the liquid refrigerant flows through the first throttling device, the liquid refrigerant is changed into a refrigerant with mixed gas and liquid under the action of the first throttling device, the refrigerant with mixed gas and liquid enters the flash evaporator, the gaseous refrigerant flows to the first enthalpy-increasing component 500 along the gas outlet of the flash evaporator, the liquid refrigerant flows out from the liquid outlet of the flash evaporator and enters the evaporator after passing through the second throttling device, and finally the refrigerant with absorbed heat enters the low-pressure compression cavity 111 through the liquid reservoir 300. The refrigerant used for supplementing air in the second enthalpy-increasing component 600 may also be provided by flash evaporators, that is, two flash evaporators may be provided in the refrigeration system or the heating system, so as to respectively deliver gaseous refrigerant to the first enthalpy-increasing component 500 and the second enthalpy-increasing component 600. In another embodiment of the present invention, the flash evaporator may be replaced by a plate heat exchanger, that is, the refrigerant used for supplementing air in the first enthalpy increasing component 500 and the second enthalpy increasing component 600 may also be provided by the plate heat exchanger, and an appropriate scheme is specifically selected according to the actual situation.

Referring to fig. 4, a compressor 1000 according to another embodiment of the present invention includes a housing 200, a pump body assembly 100 and a middle pressure housing 180, the pump body assembly 100 being disposed inside the housing 200, the pump body assembly 100 being provided with a low pressure compression chamber 111, a high pressure compression chamber 161 and at least one fourth chamber 181. For example, two fourth cavities 181 are provided, one of the fourth cavities 181 being located between the lower muffler 130 and the lower bearing 120, and the other fourth cavity 181 being located within the divider member 190. Low-pressure compression chamber 111 may discharge gas only to one of fourth chambers 181, or may discharge gas to both fourth chambers 181 at the same time. The middle pressure casing 180 is connected to the outside of the casing 200, a fifth cavity 182 is provided in the middle pressure casing 180, and the fifth cavity 182 is communicated with at least one fourth cavity 181, and together forms an intermediate chamber 194 communicating between the exhaust port of the low pressure compression chamber 111 and the intake port of the high pressure compression chamber 161. For example, the fifth cavity 182 communicates with the two fourth cavities 181, i.e., along the flow direction of the refrigerant, and the fifth cavity 182 is located between the two fourth cavities 181. The medium pressure casing 180 is provided with a first pipe 183 and a second pipe 184, the first pipe 183 penetrating the casing 200 and communicating the air outlet of the fourth chamber 181 and the air inlet of the fifth chamber 182 located below the low pressure compression chamber 111, and the second pipe 184 penetrating the casing 200 and communicating the air inlet of the fourth chamber 181 and the air outlet of the fifth chamber 182 located above the low pressure compression chamber 111. It can be appreciated that the middle pressure casing 180 is disposed outside the casing 200, which can save space inside the casing 200, make the structure inside the casing 200 compact, and reduce the occupied area of the compressor 1000.

In the embodiment of the present invention, the volume ratio of the adjacent fifth cavity 182 to the fourth cavity 181 is b, which satisfies the following conditions: b is more than or equal to 0.2 and less than or equal to 5. For example b=0.5, b=1.5, b=2, b=3. If b is less than 0.2 or greater than 5, the difference in volume between the fifth chamber 182 and the fourth chamber 181 is too large, resulting in an increase in the magnitude of pressure variation when the refrigerant flows from the fourth chamber 181 to the fifth chamber 182, and pulsation is liable to occur. Therefore, b is limited to a range from 0.2 to 5, and by reasonably designing the volumes of the fifth cavity 182 and the fourth cavity 181, the amplitude of the pressure change when the refrigerant flows from the fourth cavity 181 to the fifth cavity 182 can be reduced, so that the pulsation condition is reduced, the flow loss of the refrigerant is reduced, the suction amount of the high-pressure compression cavity 161 is improved, and the performance of the compressor 1000 is further improved.

The refrigerating device according to an embodiment of the present invention includes the compressor 1000 according to the above embodiment, and the refrigerating device may be a central air conditioner, an integral air conditioner, a split air conditioner, an air duct machine, a window machine, or the like. By adopting the compressor 1000 of the above embodiment, the compressor 1000 is provided with the low-pressure compression cavity 111, the middle cavity 194 and the high-pressure compression cavity 161 in the pump body assembly 100, and the exhaust port of the low-pressure compression cavity 111 is communicated with the air inlet of the high-pressure compression cavity 161 through the middle cavity 194, so that the refrigerant is discharged to the middle cavity 194 after being subjected to primary compression in the low-pressure compression cavity 111, and then enters the high-pressure compression cavity 161 to be subjected to secondary compression through the middle cavity 194, thereby improving the pressure of the refrigerant which is finally discharged, and being beneficial to improving the heating capacity of the compressor 1000 under the low-temperature environment or the refrigerating capacity of the high-temperature environment. The intermediate chamber 194 includes at least two chambers connected through the communication channel 140, and the volume ratio of two adjacent chambers is a, which satisfies: a is more than or equal to 0.2 and less than or equal to 5. If a is less than 0.2 or more than 5, that is, the difference between the volumes of two adjacent cavities is too large, the pressure variation amplitude of the refrigerant from one cavity to the other cavity is increased, and pulsation is easily generated. Through the volume size of two adjacent cavitys of rational design, can make the refrigerant get into the amplitude of pressure variation when another cavity from a cavity and reduce to reduce the pulsation condition, reduce the flow loss of refrigerant, improve the air suction volume of high-pressure compression chamber 161, and then promote the performance of compressor 1000.

Since the refrigeration equipment adopts all the technical solutions of the compressor 1000 in the above embodiments, at least all the beneficial effects brought by the technical solutions in the above embodiments are provided, and will not be described in detail herein.

The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of one of ordinary skill in the art without departing from the spirit of the present invention.

Claims

1. The pump body assembly is characterized by comprising a low-pressure compression cavity, a middle cavity and a high-pressure compression cavity, wherein an exhaust port of the low-pressure compression cavity is communicated with an air inlet of the high-pressure compression cavity through the middle cavity; the middle cavity comprises at least two cavities and a communication channel for communicating two adjacent cavities, wherein the volume ratio of the two adjacent cavities is a, and the following conditions are satisfied: a is more than or equal to 0.2 and less than or equal to 5.

2. The pump body assembly of claim 1, wherein: the pump body assembly comprises an upper bearing, a second cylinder, a partition plate, a first cylinder and a lower bearing which are sequentially connected, an upper silencer connected to the upper bearing and a lower silencer connected to the lower bearing, wherein the cavity of the middle cavity is located at least one of the following parts:

within the separator member;

between the lower bearing and the lower muffler;

the upper bearing and the upper silencer are arranged between the upper bearing and the upper silencer;

the lower bearing and the first cover plate are covered between the lower end face of the lower bearing;

the upper bearing and the second cover plate are covered between the upper end face of the upper bearing.

3. The pump body assembly of claim 2, wherein: the low-pressure compression cavity is arranged in the first cylinder, and the high-pressure compression cavity is arranged in the second cylinder.

4. The pump body assembly of claim 1, wherein: the volume ratio a of two adjacent cavities satisfies: a is more than or equal to 0.5 and less than or equal to 2.

5. The pump body assembly of claim 1, wherein: the pump body assembly comprises a partition plate, a lower bearing and a lower silencer, wherein the partition plate, the lower bearing and the lower silencer are connected, the lower bearing is provided with a first exhaust hole, a first cavity of the middle cavity is formed between the lower bearing and the lower silencer, the low-pressure compression cavity is communicated with the first cavity through the first exhaust hole, a second cavity of the middle cavity is arranged in the partition plate, and the first cavity is communicated with the second cavity through a communication channel.

6. The pump body assembly of claim 1, wherein: the pump body assembly comprises a first cylinder, a partition plate and a second cylinder which are connected, wherein the middle cavity is arranged in the partition plate, a plurality of cavities are arranged in the middle cavity, and the cavities are arranged along the circumference of the partition plate.

7. A compressor, comprising:

a housing;

the pump body assembly of any one of claims 1 to 6, disposed within the housing.

8. The compressor of claim 7, wherein: the compressor further comprises a first enthalpy-increasing component, wherein the first enthalpy-increasing component is connected into the middle cavity and is used for conveying a refrigerant to the middle cavity.

9. The compressor of claim 7, wherein: the compressor also comprises a second enthalpy-increasing component, wherein the second enthalpy-increasing component is connected into the low-pressure compression cavity or the high-pressure compression cavity and is used for conveying a refrigerant to the low-pressure compression cavity or the high-pressure compression cavity.

10. A compressor, comprising:

a housing;

the pump body assembly is arranged in the shell and is provided with a low-pressure compression cavity, a high-pressure compression cavity and at least one fourth cavity;

the middle pressure shell is connected to the outside of the shell, a fifth cavity is arranged in the middle pressure shell, and the fifth cavity and at least one fourth cavity are sequentially communicated and jointly form an intermediate cavity communicated between an exhaust port of the low pressure compression cavity and an air inlet of the high pressure compression cavity;

the volume ratio of the fifth cavity to the fourth cavity which are adjacent is b, and the following conditions are satisfied: b is more than or equal to 0.2 and less than or equal to 5.

11. Refrigeration plant, its characterized in that: comprising a compressor according to any one of claims 7 to 10.