CN112302939B - Multistage compressor and air conditioner - Google Patents

Multistage compressor and air conditioner Download PDF

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Publication number
CN112302939B
CN112302939B CN202011194123.5A CN202011194123A CN112302939B CN 112302939 B CN112302939 B CN 112302939B CN 202011194123 A CN202011194123 A CN 202011194123A CN 112302939 B CN112302939 B CN 112302939B
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China
Prior art keywords
pressure
exhaust port
relief channel
pressure relief
flange
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CN202011194123.5A
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Chinese (zh)
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CN112302939A (en
Inventor
魏会军
胡艳军
阙沛祯
董辉
向柳
黄秦
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Gree Green Refrigeration Technology Center Co Ltd of Zhuhai
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Gree Green Refrigeration Technology Center Co Ltd of Zhuhai
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C23/00—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids
    • F04C23/001—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids of similar working principle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
    • F04C18/30—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members
    • F04C18/34—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in group F04C18/08 or F04C18/22 and relative reciprocation between the co-operating members
    • F04C18/356—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in group F04C18/08 or F04C18/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the outer member
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
    • F04C28/24—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids characterised by using valves controlling pressure or flow rate, e.g. discharge valves or unloading valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
    • F04C29/12—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
    • F04C29/12—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet
    • F04C29/124—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet with inlet and outlet valves specially adapted for rotary or oscillating piston pumps
    • F04C29/126—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet with inlet and outlet valves specially adapted for rotary or oscillating piston pumps of the non-return type
    • F04C29/128—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet with inlet and outlet valves specially adapted for rotary or oscillating piston pumps of the non-return type of the elastic type, e.g. reed valves

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)

Abstract

The invention provides a multistage compressor and an air conditioner, wherein the multistage compressor comprises a shell and a pump body assembly, the pump body assembly is arranged in the shell, a high-pressure cavity is formed between the pump body assembly and the shell, and the pump body assembly comprises a first flange, a first-stage compression assembly, a middle partition plate and a second-stage compression assembly which are sequentially arranged; the first-stage compression component is provided with a first exhaust port and a second exhaust port, the first exhaust port is communicated with the inlet of the second-stage compression component, and the exhaust port of the second-stage compression component is communicated with the high-pressure cavity; the first flange is provided with a pressure relief channel, and an inlet of the pressure relief channel is communicated with the second exhaust port; the pressure relief channel is communicated with the high-pressure cavity under the condition that the pressure in the pressure relief channel is greater than the pressure in the high-pressure cavity; and under the condition that the pressure in the pressure relief channel is less than or equal to the pressure in the high-pressure cavity, the pressure relief channel is closed. By adopting the scheme, the energy efficiency of the multistage compressor is improved, and the abnormal sound probability is reduced.

Description

Multistage compressor and air conditioner
Technical Field
The invention relates to the technical field of compressors, in particular to a multi-stage compressor and an air conditioner.
Background
The rolling rotor type multistage compressor has the outstanding advantages of large working pressure ratio, high energy efficiency under low-temperature heating working conditions, small heat attenuation and the like, and is widely applied to the field of heat exchange. However, as the compressor continues to expand its application area, its disadvantage of operating at light load conditions (with a small differential pressure) gradually emerges: the energy efficiency is lower than that of a rolling rotor type single-stage compressor, and abnormal sound exists during high-frequency operation.
Under the light load working condition of the compressor, the discharge pressure of a refrigerant compressed by the primary cylinder is usually higher than the discharge pressure of the secondary cylinder, so that the secondary cylinder does little work on the refrigerant, even does negative work on the refrigerant, the energy efficiency of the compressor is reduced, and the secondary slide sheet and the roller lack the gas force action to generate separation and generate abnormal sound.
Disclosure of Invention
The invention provides a multistage compressor and an air conditioner, and aims to solve the problems that the multistage compressor is low in energy efficiency and generates abnormal sound when operating under a light load working condition.
In order to solve the above-mentioned problems, according to an aspect of the present invention, there is provided a multistage compressor including: a housing; the pump body assembly is arranged in the shell, a high-pressure cavity is formed between the pump body assembly and the shell, and the pump body assembly comprises a first flange, a primary compression assembly, a middle partition plate and a secondary compression assembly which are sequentially arranged; the first-stage compression assembly is provided with a first exhaust port and a second exhaust port, the first exhaust port is communicated with the inlet of the second-stage compression assembly, and the exhaust port of the second-stage compression assembly is communicated with the high-pressure cavity; the first flange is provided with a pressure relief channel, and an inlet of the pressure relief channel is communicated with the second exhaust port; the pressure relief channel is communicated with the high-pressure cavity under the condition that the pressure in the pressure relief channel is greater than the pressure in the high-pressure cavity; and under the condition that the pressure in the pressure relief channel is less than or equal to the pressure in the high-pressure cavity, the pressure relief channel is closed.
Further, the flow area of the pressure relief channel is S, the displacement of the first-stage compression assembly is V, wherein S/V>0.5(mm-1)。
Further, S/V>2(mm-1)。
Further, a first medium pressure cavity is formed in the first flange, and the second air outlet is communicated with the pressure relief channel through the first medium pressure cavity.
Further, the pump body assembly further includes: the first partition plate is positioned between the first flange and the primary compression assembly, the first partition plate is provided with a first through hole, and the second exhaust port is communicated with the first medium-pressure cavity through the first through hole.
Further, the pump body assembly further includes: and the valve body is arranged on the first flange and used for opening or closing an exhaust port of the pressure relief channel.
Further, the valve body includes: one end of the elastic valve plate is connected with the first flange, the other end of the elastic valve plate is positioned at the exhaust port of the pressure relief channel, and the elastic valve plate can elastically deform under the action of gas pressure so as to open or close the exhaust port of the pressure relief channel; the baffle sets up one side that deviates from of resilient valve piece the first flange, the one end of baffle with first flange joint, the other end of baffle with the clearance has between the other end of resilient valve piece.
Further, a second intermediate pressure cavity is formed in the middle partition plate, and the first exhaust port and the inlet of the secondary compression assembly are communicated through the second intermediate pressure cavity.
Further, the pump body assembly further includes: the second partition plate is positioned between the middle partition plate and the secondary compression assembly and is provided with a second through hole, and an inlet of the secondary compression assembly is communicated with the second middle pressure cavity through the second through hole.
According to another aspect of the present invention, there is provided an air conditioner including the multi-stage compressor described above.
The technical scheme of the invention is applied to provide a multistage compressor, which comprises a shell and a pump body assembly, wherein the pump body assembly is arranged in the shell, a high-pressure cavity is arranged between the pump body assembly and the shell, and the pump body assembly comprises a first flange, a first-stage compression assembly, a middle partition plate and a second-stage compression assembly which are sequentially arranged; the first-stage compression component is provided with a first exhaust port and a second exhaust port, the first exhaust port is communicated with the inlet of the second-stage compression component, and the exhaust port of the second-stage compression component is communicated with the high-pressure cavity; the first flange is provided with a pressure relief channel, and an inlet of the pressure relief channel is communicated with the second exhaust port; the pressure relief channel is communicated with the high-pressure cavity under the condition that the pressure in the pressure relief channel is greater than the pressure in the high-pressure cavity; and under the condition that the pressure in the pressure relief channel is less than or equal to the pressure in the high-pressure cavity, the pressure relief channel is closed. Adopt this scheme, when the multistage compressor is when light load operating mode operation, the compressed gas's that the one-level compression subassembly produced pressure is greater than the pressure in the high-pressure chamber, owing to be provided with the pressure release passageway, the compressed gas accessible pressure release passageway of one-level compression subassembly output directly carries to the high-pressure chamber, the pressure that gets into the gas in the second grade compression subassembly like this reduces, thereby can reduce or avoid the second grade compression subassembly to do the negative work to the refrigerant, the efficiency has been improved, and the effort between second grade gleitbretter and roller has been increased, reduce multistage compressor abnormal sound probability.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 illustrates a schematic structural view of a multistage compressor provided in an embodiment of the present invention;
FIG. 2 shows an enlarged view of a portion of the pump body assembly of FIG. 1 at the valve body;
FIG. 3 shows a pressure diagram of the multi-stage compressor of FIG. 1 during light load operation;
FIG. 4 is a schematic diagram showing the pressure differential as soon as the pressure relief passage in the multi-stage compressor of FIG. 1 is about to close;
fig. 5 shows a pressure diagram of a multi-stage compressor without a pressure relief passage during light load operation.
Wherein the figures include the following reference numerals:
10. a housing; 11. a high pressure chamber; 20. a first flange; 21. a pressure relief channel; 22. a first intermediate pressure chamber; 30. a first stage compression assembly; 40. a middle partition plate; 41. a second intermediate pressure chamber; 50. a secondary compression component; 60. a first separator; 70. a valve body; 71. an elastic valve plate; 72. a baffle plate; 80. a second separator.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1 to 4, an embodiment of the present invention provides a multistage compressor including: a housing 10; the pump body assembly is arranged in the shell 10, a high-pressure cavity 11 is formed between the pump body assembly and the shell 10, and the pump body assembly comprises a first flange 20, a first-stage compression assembly 30, a middle partition plate 40 and a second-stage compression assembly 50 which are sequentially arranged; the first-stage compression assembly 30 is provided with a first exhaust port and a second exhaust port, the first exhaust port is communicated with the inlet of the second-stage compression assembly 50, and the exhaust port of the second-stage compression assembly 50 is communicated with the high-pressure cavity 11; wherein, the first flange 20 is provided with a pressure relief channel 21, and the inlet of the pressure relief channel 21 is communicated with the second exhaust port; under the condition that the pressure in the pressure relief channel 21 is greater than the pressure in the high-pressure cavity 11, the pressure relief channel 21 is communicated with the high-pressure cavity 11; when the pressure in the pressure release passage 21 is less than or equal to the pressure in the high-pressure chamber 11, the pressure release passage 21 is closed.
By adopting the scheme, when the multistage compressor operates under a light load working condition, the pressure of the compressed gas generated by the first-stage compression assembly 30 is greater than the pressure in the high-pressure cavity 11, and the pressure relief channel 21 is arranged, so that the compressed gas output by the first-stage compression assembly 30 can be directly conveyed to the high-pressure cavity 11 through the pressure relief channel 21, the pressure of the gas entering the second-stage compression assembly 50 is reduced, the negative work of the second-stage compression assembly 50 on a refrigerant can be reduced or avoided, and the energy efficiency is improved. The multistage means two or more stages.
Wherein, one-level compression assembly 30 includes one-level cylinder, one-level roller, one-level gleitbretter etc. and second grade compression assembly includes second grade cylinder, second grade roller, second grade gleitbretter etc.. Through the scheme, the acting force between the secondary slide sheet and the secondary roller in the secondary cylinder is increased, and the abnormal sound probability of the multi-stage compressor is reduced.
In the present embodiment, the flow area of the pressure relief passage 21 is S, and the displacement of the first-stage compression element 30 is V, wherein S/V>0.5(mm-1). The pressure release passage 21 thus has a large flow area, and can release a large amount of gas in a relatively short time, thereby reducing the pressure difference between the pressure in the first-stage compression element 30 and the pressure in the high-pressure chamber 11.
As shown in FIG. 4, preferably, S/V>2(mm-1). This allows the pressure relief channel 21 to vent gas more quickly, reducing the pressure differential.
In this embodiment, the first flange 20 has a first intermediate pressure chamber 22 therein, and the second vent port communicates with the relief passage 21 through the first intermediate pressure chamber 22. The provision of the first intermediate pressure chamber 22 facilitates the venting of gas within the one-stage compression assembly 30. Further, the pump body assembly still includes: and a first partition plate 60, the first partition plate 60 being located between the first flange 20 and the primary compression assembly 30, the first partition plate 60 having a first through hole, and the second discharge port being in communication with the first intermediate pressure chamber 22 through the first through hole.
In this embodiment, the pump body assembly further includes: and a valve body 70 provided on the first flange 20, the valve body 70 being for opening or closing an exhaust port of the relief passage 21. Specifically, when the pressure in the relief passage 21 is higher than the pressure in the high-pressure chamber 11, the valve body 70 moves under the gas pressure, and the relief passage 21 communicates with the high-pressure chamber 11; when the pressure in the relief passage 21 is less than or equal to the pressure in the high-pressure chamber 11, the valve body 70 moves in the reverse direction, and the relief passage 21 is closed.
Specifically, the valve body 70 includes: one end of the elastic valve sheet 71 is connected with the first flange 20, the other end of the elastic valve sheet 71 is positioned at the exhaust port of the pressure relief channel 21, and the elastic valve sheet 71 can be elastically deformed under the action of gas pressure so as to open or close the exhaust port of the pressure relief channel 21; the baffle 72 is arranged on one side, away from the first flange 20, of the elastic valve sheet 71, one end of the baffle 72 is connected with the first flange 20, and a gap is formed between the other end of the baffle 72 and the other end of the elastic valve sheet 71. That is, the elastic valve sheet 71 is elastically deformed by the pressure difference between both sides of the elastic valve sheet 71, so that the exhaust port of the pressure release passage 21 is opened, and the elastic valve sheet 71 is restored to a natural state when the pressure difference is reduced to a certain value. The baffle 72 is used for limiting the elastic valve plate 71, so that the elastic valve plate 71 is prevented from being broken due to overlarge displacement, and the reliability is improved.
In the present embodiment, the intermediate partition 40 has a second intermediate pressure chamber 41 therein, and the first exhaust port and the inlet of the secondary compression assembly 50 communicate through the second intermediate pressure chamber 41. The second intermediate pressure chamber 41 is used for temporarily storing the refrigerant discharged after being compressed by the first-stage compression assembly 30.
In this embodiment, the pump body assembly further includes: and a second partition plate 80, the second partition plate 80 being located between the middle partition plate 40 and the secondary compression assembly 50, the second partition plate 80 having a second through hole through which an inlet of the secondary compression assembly 50 and the second middle pressure chamber 41 communicate. The second middle pressure chamber 41 and the secondary cylinder in the secondary compression assembly 50 can be blocked by the second partition 80, so as to prevent air leakage.
In this embodiment, the pump block assembly also includes a crankshaft that passes through the primary compression assembly 30 and the secondary compression assembly 50. The pump body assembly further comprises a liquid distributor, and the first-stage compression assembly 30 is connected with the liquid distributor. The pump body assembly further includes a second flange that is coupled to the secondary compression assembly 50.
As shown in fig. 5, the pressure of different parts of the multistage compressor without the pressure relief passage 21 varies with the rotation angle of the compressor during operation. As shown in fig. 3, the multi-stage compressor of the present embodiment is operated with different components varying in pressure according to the rotation angle of the compressor. By contrast, the pressure in the second intermediate-pressure chamber 41 can be reduced by using this scheme, so that the pressure of the gas entering the secondary compression assembly 50 is reduced, and the negative work of the secondary compression assembly 50 on the refrigerant can be reduced or avoided.
Another embodiment of the present invention provides an air conditioner including the multistage compressor described above. By adopting the scheme, when the multistage compressor operates under a light load working condition, the pressure of the compressed gas generated by the first-stage compression assembly 30 is greater than the pressure in the high-pressure cavity 11, and the pressure relief channel 21 is arranged, so that the compressed gas output by the first-stage compression assembly 30 can be directly conveyed to the high-pressure cavity 11 through the pressure relief channel 21, the pressure of the gas entering the second-stage compression assembly 50 is reduced, the negative work of the second-stage compression assembly 50 on a refrigerant can be reduced or avoided, the energy efficiency is improved, and the noise can be reduced.
To facilitate understanding of the present solution, the following is further described. The invention relates to a rolling rotor type two-stage compressor which comprises a liquid distributor, a shell, a motor and a pump body assembly, wherein the liquid distributor is arranged outside the shell and used for conveying low-pressure refrigerants to the pump body assembly. The shell wraps the motor and the pump body assembly and is isolated from the external environment in an airtight mode. The motor is fixedly connected to the upper space in the shell in an interference manner, and the pump body assembly is arranged in the shell and at the lower part of the motor. The pump body assembly comprises an upper flange (namely a first flange), a primary cylinder, a secondary cylinder, a partition plate, a lower flange (namely a second flange), a crankshaft, a roller and a sliding sheet.
The upper flange and the lower flange are arranged at two ends of the pump body assembly, and a first-stage cylinder, a middle partition plate, a lower partition plate (namely a second partition plate) and a second-stage cylinder are sequentially arranged from top to bottom. The first-stage cylinder and the second-stage cylinder are respectively internally provided with a roller and a slip sheet, the crankshaft sleeve is arranged in the shaft holes of the upper flange and the lower flange, sequentially penetrates through the first-stage cylinder, the middle partition plate, the lower partition plate and the second-stage cylinder, and is respectively provided with an eccentric part in the space of the first-stage cylinder and the space of the second-stage cylinder. The part of the crankshaft penetrating through the upper flange is connected with a rotor assembly of the motor. The roller is sleeved on the eccentric part of the crankshaft, the sliding sheet is arranged in the sliding sheet groove and can perform linear reciprocating motion, and one end of the sliding sheet is abutted against the roller to separate the space in the cylinder into an air suction cavity and a compression cavity. The motor drives the crankshaft to rotate when rotating, the refrigerant entering the first-stage cylinder is compressed and then discharged into the second-stage cylinder for compression, and then the refrigerant is discharged into the shell. The pressure in the shell is high.
The first-stage cylinder, the first-stage roller and the first-stage sliding sheet form a first-stage compression assembly used for compressing the refrigerant flowing in through the liquid separator. The secondary cylinder, the secondary roller and the secondary slide sheet form a secondary compression assembly which is used for compressing the refrigerant discharged by the primary compression assembly and discharging the compressed refrigerant into the shell. Generally, the pressure of the refrigerant discharged from the first stage compression assembly is greater than the suction pressure and less than the discharge pressure in the casing, and therefore the pressure of the refrigerant discharged from the first stage compression assembly is defined as an intermediate pressure.
A second medium-pressure cavity (used for temporarily storing the refrigerant discharged after being compressed by the first-stage compression component) and an intermediate circulation channel (used for communicating the exhaust port of the first-stage compression component, the medium-pressure cavity and the suction port of the second-stage compression component) are arranged between the first-stage compression component and the second-stage compression component. A first medium-pressure cavity enclosed by an upper flange and an upper clapboard is positioned above the first-stage compression assembly.
The structure of the invention is as follows: set up the pressure release passageway on last flange, with first middling pressure chamber and casing inner space intercommunication, set up relief valve (being the valve body) on the pressure release passageway on the last flange that is located the motor side simultaneously, constitute by pressure release valve block and pressure release valve block baffle. When the refrigerant discharged by the first-stage compression assembly enters the medium-pressure cavity and the pressure of the refrigerant is higher than the pressure in the shell, the pressure relief valve is opened, the refrigerant in the medium-pressure cavity enters the shell through the pressure relief channel, and the pressure of the medium-pressure cavity is reduced. When the pressure of the middle pressure cavity is smaller than the exhaust pressure, the pressure relief valve is closed, so that high-pressure refrigerant in the shell is prevented from entering the middle pressure cavity, and the performance of the compressor is further reduced. In order to avoid the pressure relief channel sectional area S undersize to influence the pressure relief effect of the medium pressure cavity, the pressure relief channel sectional area S should satisfy the formula: S/V is more than or equal to 0.5 (mm)-1). In the formula, V is the refrigerant discharged by one rotation of the first-stage compression assembly, namely the discharge capacity. Further, when S/V is not less than 2 (mm)-1) So as to further improve the pressure relief effect of the medium-pressure cavity.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (9)

1. A multi-stage compressor, comprising:
a housing (10);
the pump body assembly is arranged in the shell (10), a high-pressure cavity (11) is formed between the pump body assembly and the shell (10), and the pump body assembly comprises a first flange (20), a primary compression assembly (30), a middle partition plate (40) and a secondary compression assembly (50) which are sequentially arranged; the primary compression assembly (30) has a first exhaust port and a second exhaust port, the first exhaust port is communicated with the inlet of the secondary compression assembly (50), and the exhaust port of the secondary compression assembly (50) is communicated with the high-pressure cavity (11);
wherein the first flange (20) is provided with a pressure relief channel (21), and an inlet of the pressure relief channel (21) is communicated with the second exhaust port; under the condition that the pressure in the pressure relief channel (21) is greater than the pressure in the high-pressure cavity (11), the pressure relief channel (21) is communicated with the high-pressure cavity (11); the pressure relief channel (21) is closed when the pressure in the pressure relief channel (21) is less than or equal to the pressure in the high-pressure cavity (11); the first flange (20) is internally provided with a first medium pressure cavity (22), and the second exhaust port is communicated with the pressure relief channel (21) through the first medium pressure cavity (22).
2. Multistage compressor according to claim 1, characterized in that the flow area of the pressure relief channel (21) is S and the displacement of the one-stage compression assembly (30) is V, where S/V>0.5（mm-1）。
3. Multistage compressor according to claim 2, characterised in that S/V>2（mm-1）。
4. The multi-stage compressor of claim 1, wherein the pump body assembly further comprises:
a first diaphragm (60), the first diaphragm (60) being located between the first flange (20) and the primary compression assembly (30), the first diaphragm (60) having a first through-hole, the second exhaust port communicating with the first intermediate pressure chamber (22) through the first through-hole.
5. The multi-stage compressor of claim 1, wherein the pump body assembly further comprises:
and the valve body (70) is arranged on the first flange (20), and the valve body (70) is used for opening or closing an exhaust port of the pressure relief channel (21).
6. The multistage compressor according to claim 5, wherein the valve body (70) comprises:
one end of the elastic valve plate (71) is connected with the first flange (20), the other end of the elastic valve plate (71) is located at an exhaust port of the pressure relief channel (21), and the elastic valve plate (71) can elastically deform under the action of gas pressure to open or close the exhaust port of the pressure relief channel (21);
the baffle (72) is arranged on one side, deviating from the first flange (20), of the elastic valve plate (71), one end of the baffle (72) is connected with the first flange (20), and a gap is formed between the other end of the baffle (72) and the other end of the elastic valve plate (71).
7. The multistage compressor according to claim 1, wherein the intermediate partition (40) has a second intermediate pressure chamber (41) therein, the first exhaust port and the inlet of the two-stage compression assembly (50) communicating through the second intermediate pressure chamber (41).
8. The multi-stage compressor of claim 7, wherein the pump body assembly further comprises:
a second partition (80), the second partition (80) being located between the middle partition (40) and the secondary compression assembly (50), the second partition (80) having a second through hole through which an inlet of the secondary compression assembly (50) and the second intermediate pressure chamber (41) communicate.
9. An air conditioner characterized in that it comprises a multistage compressor according to any one of claims 1 to 8.
CN202011194123.5A 2020-10-30 2020-10-30 Multistage compressor and air conditioner Active CN112302939B (en)

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CN102536819B (en) * 2011-12-15 2015-09-30 珠海凌达压缩机有限公司 A kind of secondary double-cylinder of high refrigeration performance
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