A scroll compressor and a refrigeration / heat pump system using the same

Abstract

The present invention discloses a scroll compressor and a refrigeration / heat pump system using the same. The scroll compressor includes a housing, a main shaft arranged in the housing, a motor, a movable scroll and a fixed scroll. The housing is provided with an air intake port, a compression chamber is formed between the movable scroll and the fixed scroll, and the refrigerant enters the compression chamber through the air intake port; a high-pressure cover is provided on the top of the housing, the high-pressure cover is provided with an exhaust port, an air jet port and an air extraction port, the rear end cover of the fixed scroll is provided with an air jet hole and an air extraction hole, an air jet channel is provided between the air jet port and the air jet hole, and an air extraction channel is provided between the air extraction port and the air extraction hole; a fixed scroll exhaust port is provided at the center of the fixed scroll, and the fixed scroll exhaust port is connected to the exhaust port of the high-pressure disk; the air jet channel and the air extraction channel are provided on both sides of the fixed scroll exhaust port. The scroll compressor of the present invention combines intermediate air extraction with the air jet enthalpy increase technology, which not only solves the problem of low operating efficiency of the scroll compressor under low temperature environment, but also improves the system's COP and saves energy.

Description

Technical Field

[0001] The invention relates to the field of jet enthalpy-increasing scroll compressors, and in particular to a scroll compressor and a refrigeration / heat pump system using the same. Background Art

[0002] A scroll compressor is a positive displacement compressor that compresses the refrigerant through a moving and stationary scroll disk. Compared with other types of compressors, scroll compressors have a very long service life. At the same time, they run smoothly, have less vibration, are quiet, and have continuous and smooth gas delivery. However, under low ambient temperatures, the performance of scroll compressors is often poor. Jet reheat technology can improve this problem. Jet reheat refers to a technology that opens an air filling hole at a specific position on the stationary scroll disk of the scroll compressor, so that during the compression process of the scroll compressor, medium-temperature and medium-pressure refrigerant is introduced and mixed with the original refrigerant in the compression chamber, and then continues to compress.

[0003] However, the energy saving effect of only using the jet enthalpy increase technology for the scroll compressor is still insufficient in some occasions. Therefore, the device adopts a device combining intermediate step coupling heating and jet enthalpy increase to further improve the efficiency of the system. Summary of the invention

[0004] In view of the shortcomings of the prior art, the present invention provides a heat pump system with dual functions of staged heating and jet enthalpy increase. Compared with the prior art, it is more efficient and energy-saving, and only requires a small improvement to the existing two-stage compressor, which is easy to practice and promote.

[0005] In order to achieve the above-mentioned object of the invention, the present invention adopts the following technical solutions:

[0006] A scroll compressor comprises a shell, a main shaft arranged in the shell, a motor, a movable scroll and a fixed scroll, the shell is provided with an air intake port, a compression chamber is formed between the movable scroll and the fixed scroll, and the refrigerant enters the compression chamber through the air intake port; a high-pressure cover is provided on the top of the shell, the high-pressure cover is provided with an exhaust port, an injection port and an exhaust port, the rear end cover of the fixed scroll is provided with an injection hole and an exhaust hole, an injection channel is provided between the injection port and the injection hole, and an exhaust channel is provided between the exhaust port and the exhaust hole; a fixed scroll exhaust port is provided at the center of the fixed scroll, and the fixed scroll exhaust port is connected with the exhaust port of the high-pressure disk; the injection channel and the exhaust channel are provided on both sides of the fixed scroll exhaust port.

[0007] As one of the preferred solutions of the present invention, filters are provided in both the air suction channel and the air injection channel, and a one-way valve is provided in the air suction channel.

[0008] As one of the preferred solutions of the present invention, there are multiple air injection holes and air extraction holes, and each pair of air injection holes / air extraction holes is symmetrically arranged.

[0009] The present invention also provides a refrigeration / heat pump system, comprising the scroll compressor, condenser, first liquid reservoir, second liquid reservoir, first expansion valve, second expansion valve, third expansion valve, economizer, one-way valve, heat exchanger, filter dryer, evaporator, bypass valve, gas-liquid separator; wherein, the exhaust port of the scroll compressor is connected to the refrigerant inlet of the condenser, the refrigerant outlet of the condenser is connected to the inlet of the first liquid reservoir, the outlet of the first liquid reservoir is connected to the first inlet of the economizer, the first outlet of the economizer is connected to the inlet of the second expansion valve, the outlet of the second expansion valve is connected to the inlet of the one-way valve, the outlet of the one-way valve is connected to the inlet of the filter dryer, the outlet of the filter dryer is connected to the inlet of the third expansion valve, the outlet of the third expansion valve is connected to the inlet of the evaporator, and the outlet of the evaporator is connected to the inlet of the evaporator. The inlet of the first liquid storage tank is connected to the inlet of the gas-liquid separator, and the outlet of the gas-liquid separator is connected to the suction port of the scroll compressor to form a refrigerant circulation loop; the outlet of the first liquid storage tank is connected to the inlet of the first expansion valve, the outlet of the first expansion valve is connected to the second inlet of the economizer, and the second outlet of the economizer is connected to the jet port of the scroll compressor to form an jet enthalpy increase pipeline; the exhaust port of the scroll compressor is connected to the refrigerant inlet of the heat exchanger, the refrigerant outlet of the heat exchanger is connected to the inlet of the second liquid storage tank, and the outlet of the second liquid storage tank is connected to the inlet of the drying filter to form an intermediate exhaust pipeline; the exhaust port of the scroll compressor is connected to the inlet of the bypass valve, and the outlet of the bypass valve is connected to the inlet of the third expansion valve to form a defrost pipeline; the cold water outlet of the heat exchanger is connected to the cold water inlet of the condenser to form a cold water pipeline.

[0010] As one of the preferred solutions of the present invention, the opening of the bypass valve is adjustable.

[0011] As one of the preferred schemes of the present invention, the system includes an operating mode and a defrost mode, and the opening and closing state of the bypass valve is adjusted to switch the operating mode and the defrost mode; in the defrost mode, part of the refrigerant circulation circuit, the cold water pipeline and the defrost pipeline operate simultaneously.

[0012] Compared with the prior art, the present invention has the following beneficial effects: the scroll compressor of the present invention solves the problem of low operating efficiency of the scroll compressor in a low-temperature environment by combining intermediate exhaust and jet enthalpy increase technology. The COP of the refrigeration / heat pump system using the compressor is higher, saving energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic structural diagram of the scroll compressor of the present invention.

[0014] Figure 2 It is a simplified diagram of the injection and exhaust passages of the scroll compressor of the present invention.

[0015] Figure 3 This is a structural diagram of the dynamic and static scrolls of the scroll compressor of the present invention.

[0016] Figure 4 It is a schematic diagram of the flow chart of the refrigeration / heat pump system in the operating mode of the present invention;

[0017] Figure 5 It is a schematic diagram of the flow chart of the defrosting mode of the refrigeration / heat pump system of the present invention.

[0018] Figure numerals: 1-scroll compressor, 2-condenser, 3-first liquid reservoir, 4-first expansion valve, 5-economizer, 6-second expansion valve, 7-check valve, 8-drying filter, 9-third expansion valve, 10-bypass valve, 11-evaporator, 12-gas-liquid separator, 13-heat exchanger, 14-second liquid reservoir.

[0019] 21-intake port, 22-main shaft, 23-motor, 24-housing, 25-orbiting scroll, 26-stationary scroll, 27-filter, 28-injection channel, 29-exhaust port, 210-exhaust channel, 211-check valve, 212-stationary scroll exhaust port, 213-high-pressure cover, 214-injection port, 215-exhaust port; 34-injection hole, 35-exhaust hole. DETAILED DESCRIPTION

[0020] The technical solution of the present invention will be further explained below.

[0021] Example 1

[0022] like Figure 1 , Figure 2 As shown, this embodiment provides a scroll compressor, which integrates the exhaust heating and the jet enthalpy increase structure, and is mainly composed of a housing 24, a main shaft 22, a motor 23, a movable scroll 25, a fixed scroll 26, a high-pressure cover 213, an exhaust structure and an exhaust structure. The housing 24 of the scroll compressor is provided with an air intake port 21, and the high-pressure cover 213 is provided with an exhaust port 29, an exhaust port 214 and an exhaust port 215. The exhaust structure includes: an exhaust channel 28 connected to the fixed scroll 26, a filter 27 and an exhaust hole 34 of the rear end cover of the fixed scroll are provided in the exhaust channel 28. The exhaust structure includes: an exhaust channel 210 connected to the fixed scroll 26, a filter 27, a one-way valve 211 and an exhaust hole 35 of the rear end cover of the fixed scroll are provided in the exhaust channel 210.

[0023] When the scroll compressor is running, the air intake port 21 sucks in the refrigerant discharged from the evaporator, enters the compression chamber formed by the moving and stationary scroll discs and begins to compress. During the compression process, the refrigerant first reaches the suction hole 35 of the stationary scroll disc, and part of the refrigerant enters the suction channel 210 from the suction hole, reaches the one-way valve 211 and the filter 27 in turn, and is finally discharged from the suction port 215 on the high-pressure cover. At the same time, new refrigerant enters from the injection port 214, enters the filter 27 and the injection hole 34 of the stationary scroll disc in turn, and then enters the compression chamber to merge with the remaining refrigerant and continue to be compressed until it enters the central compression chamber. After the high-temperature and high-pressure refrigerant is discharged from the exhaust port 212 of the stationary scroll disc in the central compression chamber, it is discharged from the exhaust port 29 on the high-pressure cover and leaves the scroll compressor.

[0024] like Figure 3 As shown, the injection holes 34 and the exhaust holes 35 are opened on the rear end cover of the fixed scroll plate 26, and each pair of holes are opened symmetrically. When the movable scroll plate 25 makes a circular orbital motion around the center of the fixed scroll plate 26, as shown in the figure, only one quarter of the time the two pairs of holes are in the same compression chamber, that is, only one quarter of the time the phenomenon of injection gas leaking into the exhaust gas channel occurs. In this device, a small amount of blowby has little effect and can be allowed.

[0025] The scroll compressor described in this embodiment solves the problem of low operating efficiency of the scroll compressor in a low-temperature environment by combining intermediate air extraction with jet enthalpy increase technology.

[0026] Example 2

[0027] like Figure 4 As shown, this embodiment provides a refrigeration / heat pump system using the scroll compressor described in Example 1, including a refrigerant circulation circuit, an injection enthalpy increase pipeline, an intermediate exhaust pipeline, a defrost pipeline and a cold water pipeline. Specifically, it includes the scroll compressor 1 described in Example 1, a condenser 2, a first liquid reservoir 3, a second liquid reservoir 14, a first expansion valve 4, a second expansion valve 6, a third expansion valve 9, an economizer 5, a one-way valve 7, a heat exchanger 13, a drying filter 8, an evaporator 11, a bypass valve 10, and a gas-liquid separator 12; wherein,

[0028] The exhaust port of the scroll compressor 1 is connected to the refrigerant inlet of the condenser 2, the refrigerant outlet of the condenser 2 is connected to the inlet of the first liquid reservoir 3, the outlet of the first liquid reservoir 3 is connected to the first inlet of the economizer 5, the first outlet of the economizer 5 is connected to the inlet of the second expansion valve 6, the outlet of the second expansion valve 6 is connected to the inlet of the one-way valve 7, the outlet of the one-way valve 7 is connected to the inlet of the drying filter 8, the outlet of the drying filter 8 is connected to the inlet of the third expansion valve 9, the outlet of the third expansion valve 9 is connected to the inlet of the evaporator 11, the outlet of the evaporator 11 is connected to the inlet of the gas-liquid separator 12, and the outlet of the gas-liquid separator 12 is connected to the suction port of the scroll compressor 1, forming a refrigerant circulation loop;

[0029] The outlet of the first liquid storage tank 3 is connected to the inlet of the first expansion valve 4, the outlet of the first expansion valve 4 is connected to the second inlet of the economizer 5, and the second outlet of the economizer 5 is connected to the jet port of the scroll compressor 1, forming an jet enthalpy increase pipeline;

[0030] The air extraction port of the scroll compressor 1 is connected to the refrigerant inlet of the heat exchanger 13, the refrigerant outlet of the heat exchanger 13 is connected to the inlet of the second liquid reservoir 14, and the outlet of the second liquid reservoir 14 is connected to the inlet of the drying filter 8, forming an intermediate air extraction pipeline;

[0031] The air extraction port of the scroll compressor 1 is connected to the inlet of the bypass valve 10, and the outlet of the bypass valve 10 is connected to the inlet of the third expansion valve 9, forming a defrosting pipeline;

[0032] The cold water outlet of the heat exchanger 13 is connected to the cold water inlet of the condenser 2 to form a cold water pipeline.

[0033] The refrigeration / heat pump system of the present invention can realize an operation mode and a defrosting mode, which are as follows:

[0034] like Figure 4As shown, in the operation mode, the bypass valve 10 is closed, and cold water enters from the cold water inlet of the heat exchanger 13, cools the low-pressure refrigerant, and then enters the condenser 2 to cool the high-pressure refrigerant, and finally is discharged from the cold water outlet of the condenser 2. At the same time, the high-pressure refrigerant of the scroll compressor 1 is discharged from the exhaust port 29 and enters the condenser 2, and then enters the first liquid reservoir 3 after heat exchange with cold water in the condenser 2. After being discharged from the first liquid reservoir 3, it is divided into two paths: the auxiliary refrigerant enters the first expansion valve 4, and then enters the economizer 5 after cooling and reducing pressure in the first expansion valve 4, and then exchanges heat with the main refrigerant in the economizer 5, and then re-enters the scroll compressor 1 from the jet port 214, mixes with the original low-pressure refrigerant of the scroll compressor 1, and then enters the high-pressure stage compression. The refrigerant added to the auxiliary path can reduce the exhaust temperature of the scroll compressor 1 and improve the system efficiency. The main refrigerant enters the economizer 5, absorbs heat from the auxiliary refrigerant, enters the second expansion valve 6 to cool down and reduce pressure, and then enters the one-way valve 7. At the same time, the intermediate air extraction process is also in progress. The low-pressure refrigerant is discharged from the air extraction port 215 of the scroll compressor 1 and enters the heat exchanger 13. It exchanges heat with cold water in the heat exchanger 13, and enters the second liquid storage 14 after the temperature is reduced. It is discharged from the second liquid storage 14 and merges with the main refrigerant discharged from the one-way valve 7, so that the main refrigerant is cooled again. After merging, it passes through the drying filter 8 and the third expansion valve 9 and enters the evaporator 11, so that the refrigerant can absorb more heat and improve the cop of the system. The refrigerant discharged from the evaporator 11 passes through the gas-liquid separator 12 and re-enters the air suction port 21 of the scroll compressor 1.

[0035] like Figure 5 As shown, in the defrost mode, the bypass valve 10 is opened and the fan of the evaporator 11 is turned off. The low-pressure refrigerant of the scroll compressor 1 is discharged from the air suction port 215, passes through the bypass valve 10, enters the evaporator 11, releases heat in the evaporator 11 to defrost, and then passes through the gas-liquid separator 12 to return to the air suction port 21 of the scroll compressor 1. The two modes can be switched to each other. When the evaporator 11 needs to be defrosted, it enters the defrost mode, and returns to the operating mode after defrosting is completed.

[0036] It can be seen that the system described in this embodiment can not only ensure the normal heating / cooling of the system, but also further improve the COP of the system and save energy through the intermediate air extraction and injection enthalpy increase structure.

[0037] It should be noted that the above embodiments can be freely combined as needed. The above description is only a detailed description of the preferred embodiments and principles of the present invention. For ordinary technicians in this field, according to the ideas provided by the present invention, there will be changes in the specific implementation methods, and these changes should also be regarded as the protection scope of the present invention.

Claims

1. A scroll compressor, characterized in that: The invention comprises a shell, a main shaft, a motor, a movable scroll and a fixed scroll arranged in the shell, the shell is provided with an air intake port, a compression chamber is formed between the movable scroll and the fixed scroll, and the refrigerant enters the compression chamber through the air intake port; a high-pressure cover is provided on the top of the shell, the high-pressure cover is provided with an exhaust port, an air jet port and an air extraction port, the rear end cover of the fixed scroll is provided with an air jet hole and an air extraction hole, an air jet channel is provided between the air jet port and the air jet hole, and an air extraction channel is provided between the air extraction port and the air extraction hole; a fixed scroll exhaust port is provided at the center of the fixed scroll, and the fixed scroll exhaust port is connected with the exhaust port of the high-pressure disk; the air jet channel and the air extraction channel are provided on both sides of the fixed scroll exhaust port; There are multiple jet holes and exhaust holes, and each pair of jet holes / exhaust holes is symmetrically arranged. When the orbiting scroll makes a circular orbit around the center of the stationary scroll, the two pairs of holes are in the same compression chamber only for a quarter of the time.

2. The scroll compressor according to claim 1, characterized in that: Filters are arranged in the air suction channel and the air injection channel, and a one-way valve is arranged in the air suction channel.

3. A refrigeration / heat pump system, characterized in that: The invention comprises the scroll compressor, condenser, first liquid reservoir, second liquid reservoir, first expansion valve, second expansion valve, third expansion valve, economizer, one-way valve, heat exchanger, filter dryer, evaporator, bypass valve and gas-liquid separator as described in claim 1 or 2; wherein: The exhaust port of the scroll compressor is connected to the refrigerant inlet of the condenser, the refrigerant outlet of the condenser is connected to the inlet of the first liquid accumulator, the outlet of the first liquid accumulator is connected to the first inlet of the economizer, the first outlet of the economizer is connected to the inlet of the second expansion valve, the outlet of the second expansion valve is connected to the inlet of the one-way valve, the outlet of the one-way valve is connected to the inlet of the drying filter, the outlet of the drying filter is connected to the inlet of the third expansion valve, the outlet of the third expansion valve is connected to the inlet of the evaporator, the outlet of the evaporator is connected to the inlet of the gas-liquid separator, and the outlet of the gas-liquid separator is connected to the suction port of the scroll compressor, forming a refrigerant circulation loop; The outlet of the first liquid storage device is connected to the inlet of the first expansion valve, the outlet of the first expansion valve is connected to the second inlet of the economizer, and the second outlet of the economizer is connected to the jet port of the scroll compressor to form an jet enthalpy increase pipeline; The air extraction port of the scroll compressor is connected to the refrigerant inlet of the heat exchanger, the refrigerant outlet of the heat exchanger is connected to the inlet of the second liquid storage tank, and the outlet of the second liquid storage tank is connected to the inlet of the drying filter to form an intermediate air extraction pipeline; The air extraction port of the scroll compressor is connected to the inlet of the bypass valve, and the outlet of the bypass valve is connected to the inlet of the third expansion valve to form a defrosting pipeline; The cold water outlet of the heat exchanger is connected to the cold water inlet of the condenser to form a cold water pipeline.

4. The refrigeration / heat pump system according to claim 3, characterized in that: The opening degree of the bypass valve is adjustable.

5. The refrigeration / heat pump system according to claim 4, characterized in that: The bypass valve is adjusted to switch between the operating mode and the defrosting mode.

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