Built-in medium-pressure channel structure of two-stage refrigeration compressor

Abstract

The utility model discloses a built-in medium-pressure channel structure of a two-stage refrigeration compressor, which relates to the technical field of compressors and comprises a compressor shell, a cylinder piston space and a medium-pressure channel space are arranged in the compressor shell, the cylinder piston space is isolated from the medium-pressure channel space, and the medium-pressure channel space is communicated with the cylinder piston space. The medium-pressure channel space is arranged around the upper side of the cylinder body piston space, the upper side of the cylinder body piston space is an annular wall body, a plurality of piston sets are arranged in the cylinder body piston space, a plurality of pistons are arranged in the piston sets, a cylinder cover corresponding to the piston sets is arranged on the compressor shell, a valve plate is arranged in the cylinder cover, and the valve plate is arranged in the cylinder cover. A partition wall body is arranged in the medium-pressure channel space and divides the medium-pressure channel space into an air inlet channel and an air outlet channel.

Description

TECHNICAL FIELD

[0001] The utility model relates to a compressor technical field, concretely relates to a built-in middle pressure channel structure of two-stage refrigeration compressor. BACKGROUND

[0002] With the continuous improvement of people's living standards, the demand for frozen food is increasing, and two-stage low-temperature refrigeration compressor, as the core component of compression refrigeration mode, is widely used. In the range of 5-30 horsepower refrigeration compressor, semi-enclosed piston type two-stage low-temperature refrigeration compressor is mainly used, which has high low-temperature refrigeration efficiency and simple system, and is welcomed by refrigeration engineering merchants.

[0003] The existing two-stage compressor middle pressure channel layout has the following disadvantages:

[0004] Due to the limitation of the structure of the traditional piston refrigeration compressor, the middle pressure channel of the piston type two-stage low-temperature refrigeration compressor is basically composed of external connecting pipes. This leads to an asymmetric center arrangement of the compressor, and the compressor shakes greatly during operation. Moreover, it brings some trouble to the production of two-stage compressors. The middle pressure pipeline must be welded after the compressor is assembled. Due to the welding stress problem, it is often impossible to reinstall after disassembly, which can easily cause flange joint surface leakage and normal operation. Therefore, it brings certain pressure to the assembly and production of compressors and after-sales maintenance. SUMMARY

[0005] The utility model relates to a built-in middle pressure channel structure of two-stage refrigeration compressor, which solves the problem that the middle pressure channel is composed of external connecting pipes.

[0006] TECHNICAL SCHEME

[0007] To solve the above problems, the technical scheme provided by the utility model is as follows:

[0008] A built-in middle pressure channel structure of two-stage refrigeration compressor, comprising a compressor shell, a cylinder-piston space and a middle pressure channel space are provided in the compressor shell, the cylinder-piston space is isolated from the middle pressure channel space, the middle pressure channel space is arranged around the upper side of the cylinder-piston space, the upper side of the cylinder-piston space is an annular wall, a plurality of piston groups are provided in the cylinder-piston space, a plurality of pistons are provided in each piston group, a cylinder cover corresponding to the piston group is provided on the compressor shell, a valve plate is provided in the cylinder cover, a partition wall is provided in the middle pressure channel space, and the partition wall divides the middle pressure channel space into an inlet channel and an outlet channel.

[0009] Further, the valve plate is composed of an inlet part and an outlet part, the inlet part is located on one side of the valve plate, and the outlet part is located on the other side.

[0010] Further, the side of the valve plate of the air inlet part is provided with an air inlet, and the valve plate of the air inlet part is provided with an air inlet hole corresponding to the annular wall body of the piston, and the air inlet hole is provided with a valve plate.

[0011] Further, the valve plate of the air outlet part is provided with an air outlet hole corresponding to the annular wall body, and the valve plate of the air outlet part is provided with a gas outlet, and the air outlet hole is provided with a valve plate.

[0012] Further, the air inlet is communicated with the air inlet channel.

[0013] Further, the gas outlet is communicated with the air outlet channel.

[0014] Further, the compressor shell is provided with an economizer liquid injection interface, and the economizer liquid injection interface is arranged on the side of the cylinder head.

[0015] Further, the compressor shell is provided with a motor cooling liquid injection interface at the motor mounting position, and the motor cooling liquid injection interface is arranged on the top or side of the compressor shell corresponding to the motor position.

[0016] Further, the air outlet channel is communicated with the air inlet.

[0017] Further, one side of the compressor shell is provided with a suction filter barrel body, the suction filter barrel body is a hollow structure, the suction filter barrel body is provided with a suction filter screen, and the air outlet of the suction filter barrel body is communicated with the air inlet channel.

[0018] Beneficial effects

[0019] Compared with the prior art, the technical scheme has the following beneficial effects:

[0020] The technical scheme provided by the utility model discloses in order to reduce the production process difficulty of two-stage compressor, improve the symmetry of the structure layout of compressor, reduce the shake of compressor operation, and we pass through the optimization design of the internal passage of compressor, and the medium pressure passage is designed with built-in structure. Greatly improve the process requirement of compressor production, also bring great convenience for subsequent maintenance compressor, improve the overall property and the symmetry of structure layout of compressor, thereby reduce the shake of compressor operation, improve the working stability and reliability of compressor. DRAWINGS

[0021] Figure 1 It is the structural schematic diagram of the embodiment 1 of the utility model discloses;

[0022] Figure 2This is a cross-sectional view of the internal space of Embodiment 1 of this utility model;

[0023] Figure 3 This is a cross-sectional view of the partition wall body of Embodiment 1 of this utility model;

[0024] Figure 4 This is a schematic diagram of the valve plate structure in Embodiment 1 of this utility model;

[0025] Figure 5 This is a cross-sectional view of the air intake filter barrel body of Embodiment 1 of this utility model;

[0026] Figure 6 This is a schematic diagram showing the location of the fuel injection interface of the economizer in Embodiment 1 of this utility model;

[0027] Figure 7 This is a schematic diagram showing the location of the motor cooling spray interface in Embodiment 1 of this utility model. Detailed Implementation

[0028] To make the technical solution of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0029] Example 1

[0030] Combined with appendix Figures 1-7 A two-stage refrigeration compressor with a built-in intermediate-pressure channel structure includes a compressor housing 10. The compressor housing 10 includes a cylinder piston space 2 and an intermediate-pressure channel space 3. Both the cylinder piston space 2 and the intermediate-pressure channel space 3 are enclosed by walls. Both the cylinder piston space 2 and the intermediate-pressure channel space 3 are located within the compressor housing 10 and are isolated from each other. The intermediate-pressure channel space 3 is located above the cylinder piston space 2. An annular wall 21 for piston movement is provided on the upper side of the cylinder piston space 2, and the intermediate-pressure channel space 3 surrounds the annular wall 21 on the upper side of the cylinder piston space 2. This space-saving internal structure, which isolates the intermediate-pressure channel space 3 from part of the cylinder piston space 2, facilitates separate injection ports for the economizer and motor cooling fluid, and is more conducive to the working characteristics of environmentally friendly refrigerants.

[0031] A piston crank is rotatably mounted in the cylinder piston space 2 inside the compressor housing 10. Several piston groups facing different directions are connected to the piston crank. Each piston group consists of one or more pistons. A motor is located at the end of the compressor housing 10. The piston crank is connected to the output shaft of the motor. The motor drives the piston crank to rotate, which in turn drives each piston group to run in the cylinder piston space 2. An annular wall 21 is arranged corresponding to the piston. The piston moves in the annular wall 21 to perform gas compression. The pistons in each piston group run synchronously.

[0032] The several piston groups of the piston crank rod preferably are three groups, two of which are first-stage compression pistons and the other is a second-stage compression piston, and in other embodiments, the number of piston groups of the first-stage compression pistons and the second-stage compression pistons can be increased according to design, and in the case of multi-stage compression, a third-stage compression piston group can also be added, which works in the same way, the exhaust passage of the compressed gas in the first-stage compression piston group is connected with the intake passage of the second-stage compression group, so that the pistons in the second-stage piston group run for a second time to compress the compressed gas, and the compressed gas can be further compressed for a third time, and so on.

[0033] The air inlet of the air suction filter barrel cylinder body 11 is connected with the air inlet pipeline 112, the gas filtered by the air suction filter screen 111 in the air suction filter barrel cylinder body 11 is discharged from the air outlet of the air suction filter barrel cylinder body 11, and the air outlet is connected with the air inlet passage 31, so as to directly supply the filtered gas to the air inlet passage and further to the pistons in the compressor for compression.

[0034] The several piston groups of the piston crank rod are oriented in different directions, and the piston groups are connected with the cylinder covers 6 corresponding to the piston groups, the cylinder covers 6 are hollow structures, the valve plates 4 are arranged in the cylinder covers 6, the valve plates 4 cover the top of the annular wall body 21, and at the same time, since the annular wall body 21 is surrounded by the space as the medium-pressure passage space 3, the valve plates 4 cover the medium-pressure passage space 3 and the annular wall body 21 at the same time.

[0035] The medium-pressure passage space 3 is further divided into the air inlet passage 31 and the exhaust passage 32, and the partition wall body 34 is arranged in the medium-pressure passage space 3, so as to separate the air inlet passage 31 and the exhaust passage 32, and the partition wall body 34 is preferably connected with the annular wall body 21 of one side piston.

[0036] Only the pressure relief valve 35 is arranged between the air inlet passage 31 and the exhaust passage 32, which is used to meet the safety standard and prevent accidents.

[0037] The air suction filter barrel cylinder body 11 is arranged on one side of the compressor shell 10, the air suction filter barrel cylinder body 11 is a hollow structure, and the air suction filter screen 111 is arranged in the air suction filter barrel cylinder body 11, the air suction filter screen 111 prevents particulate impurities from entering the compressor and damaging the piston groups, the air suction filter barrel cylinder body 11 is cast into shape, the flow area of the air suction filter screen of the double-stage compressor is expanded, the air suction resistance is reduced, and the air suction efficiency of the double-stage compressor is improved.

[0038] When the pistons in each piston group are multiple, the partition wall body 34 is arranged on the side close to the air suction filter barrel cylinder body 11, so that when the gas discharge outlet 44 connected with the exhaust passage 32 is arranged on the valve plate 4, the position of the gas discharge outlet 44 can be located at the central position of the pistons in each piston group, and the gas can be efficiently discharged.

[0039] The valve plate 4 is composed of two parts, one side of the valve plate 4 is an air inlet part, and the other side is an air outlet part, the upper side of the valve plate 4 of the air inlet part is provided with an air inlet 41, the valve plate 4 of the air inlet part is provided with an air inlet hole 42 corresponding to the annular wall body 21 of the piston, the valve plate 4 of the air outlet part is provided with an air outlet hole 43, the position of the air outlet hole 43 is also arranged corresponding to the annular wall body 21, the air inlet hole 42 and the air outlet hole 43 are arranged corresponding to the annular wall body 21, and the piston in the annular wall body 21 directly cooperates with the air inlet hole 42 and the air outlet hole 43, and the valve plate 4 of the air outlet part is provided with a gas outlet 44, the air inlet hole 42 and the air outlet hole 43 are provided with valve plates 45, the valve plates 45 are used for one-way gas passing, the valve plate 45 located in the air inlet part allows gas to enter only into the annular wall body 21 where the piston is located, and the valve plate 45 located in the air outlet part is used for discharging the compressed gas from the annular wall body 21.

[0040] The air inlet 41 is in communication with the air inlet channel 31, and the gas outlet 44 is in communication with the air outlet channel 32, after the gas enters the suction filter barrel body 11, it is filtered by the suction filter screen 111 and then enters the air inlet channel 31 through the air outlet, the gas in the air inlet channel 31 reaches the air inlet hole 42 through the air inlet 41, the valve plate 45 of the air inlet hole 42 is opened, the gas enters the annular wall body 21 for compression by the piston, after the piston is compressed, the valve plate 45 of the air outlet hole 43 is opened, and the compressed air enters the air outlet channel 32 through the gas outlet 44.

[0041] The air outlet channels 32 of the primary compression pistons can be connected to form one air outlet channel 32, the air outlet channels 32 of the primary compression pistons are connected to the air inlet of the secondary compression piston, so that the compressed gas can enter the piston again for secondary compression, and the gas outlet 44 of the secondary compression piston can be arranged on the cylinder cover 6, so that the gas can be directly connected to the gas conveying pipeline 7, and the secondary compressed gas can be conveyed to the working space through the gas conveying pipeline 7.

[0042] The middle pressure pipeline in the dual-stage compressor is built-in, which simplifies the assembly process of the compressor and is also beneficial to the maintenance of the compressor in the later period. Because the pipeline is welded, after disassembly and maintenance, it is not easy to restore after reinstallation due to welding stress. By adopting the built-in middle pressure pipeline of the compressor, the external part of the compressor is more simple.

[0043] The economizer liquid injection interface 8 is arranged on the compressor shell 10, and the economizer liquid injection interface 8 can be arranged on the side of the cylinder cover, the economizer liquid injection interface 8 is in communication with the middle pressure channel space 3, and the motor cooling liquid injection interface 9 is arranged on the motor installation position of the compressor shell 10, and the motor cooling liquid injection interface 9 can be arranged on the top or the side corresponding to the position of the motor on the compressor shell 10.

[0044] The built-in channel allows for separate injection ports for the economizer and motor cooling refrigerant, which is more conducive to the operating characteristics of the environmentally friendly refrigerant. Because the environmentally friendly refrigerant has a lower discharge temperature, and its cooling capacity increases significantly after subcooling the economizer, the compressor requires the economizer to operate continuously, regardless of the discharge temperature. Simultaneously, since the power consumption per unit cooling capacity of the environmentally friendly refrigerant is higher than that of the previous R22 refrigerant, the compressor's initial load (high-temperature range) shaft power is greater. Therefore, in the high-temperature range, the economizer can be deactivated for refrigerant injection, and motor cooling refrigerant injection can be performed only according to the compressor motor load and temperature requirements, allowing the compressor to operate over a wider range of conditions.

[0045] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A two-stage refrigeration compressor built-in medium pressure passage structure, characterized by, The compressor shell is provided with a cylinder-piston space and a medium-pressure channel space, the cylinder-piston space is isolated from the medium-pressure channel space, the medium-pressure channel space is arranged around the upper side of the cylinder-piston space, the upper side of the cylinder-piston space is an annular wall, the cylinder-piston space is provided with a plurality of piston groups, each piston group is provided with a plurality of pistons, the compressor shell is provided with cylinder covers corresponding to the piston groups, the cylinder covers are provided with valve plates, the medium-pressure channel space is provided with a partition wall, and the medium-pressure channel space is divided into an air inlet channel and an air outlet channel by the partition wall.

2. A two-stage refrigeration compressor with built-in medium pressure passage structure according to claim 1, characterized in that, The valve plate is composed of an air inlet part and an air outlet part, the air inlet part is arranged on one side of the valve plate, and the air outlet part is arranged on the other side.

3. A two-stage refrigeration compressor with built-in medium pressure passage structure according to claim 2, characterized in that, The side edge of the valve plate of the air inlet part is provided with an air inlet, the valve plate of the air inlet part is provided with an air inlet hole corresponding to the annular wall of the piston, and the air inlet hole is provided with a valve plate.

4. A two-stage refrigeration compressor built-in medium pressure passage structure according to claim 2, characterized in that, The valve plate of the air outlet part is provided with an air outlet hole corresponding to the annular wall, the valve plate of the air outlet part is provided with a gas outlet, and the air outlet hole is provided with a valve plate.

5. A two-stage refrigeration compressor with built-in medium pressure passage structure according to claim 3, characterized in that, The air inlet is communicated with the air inlet channel.

6. A two-stage refrigeration compressor built-in medium pressure passage structure according to claim 4, characterized in that, The gas outlet is communicated with the air outlet channel.

7. A two-stage refrigeration compressor with built-in medium pressure passage structure according to claim 1, characterized in that, The compressor shell is provided with an economizer liquid injection interface, and the economizer liquid injection interface is arranged on the side of the cylinder cover.

8. A two-stage refrigeration compressor built-in medium pressure passage structure according to claim 1, characterized in that, The compressor shell is provided with a motor cooling liquid injection interface at the motor installation position, and the motor cooling liquid injection interface is arranged on the top or side of the compressor shell corresponding to the motor position.

9. A two-stage refrigeration compressor built-in medium pressure passage structure according to claim 6, characterized in that, The air outlet channel is communicated with the air inlet.

10. A two-stage refrigeration compressor built-in medium pressure passage structure according to claim 1, characterized in that, One side of the compressor shell is provided with a suction filter barrel body, the suction filter barrel body is a hollow structure, the suction filter barrel body is provided with a suction filter screen, and the air outlet of the suction filter barrel body is communicated with the air inlet channel.

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