CN100561073C - Refrigerant Cooling Device for Variable Capacity Rotary Compressor - Google Patents

Abstract

The invention discloses a refrigerant cooling device for a variable capacity rotary compressor. It is installed in the outdoor unit of an air conditioner using a variable-capacity rotary compressor, and is connected between multiple compression devices, and the refrigerant flows into the next compression device after being compressed once from any compression device. Refrigerant cooling components that were previously cooled by condensate dripping from the condenser. The refrigerant cooling device of the variable capacity rotary compressor provided by the present invention uses condensed water to cool the refrigerant flowing to the bypass side connecting pipe of another compression device after the first compression, which not only reduces the discharge temperature of the refrigerant , and can also prevent motor performance degradation caused by motor overheating, and can improve heat exchange efficiency while keeping the size of the condenser unchanged, thereby improving the performance of the entire system.

Description

Refrigerant Cooling Device for Variable Capacity Rotary Compressor

technical field

The invention relates to a variable capacity rotary compressor, in particular to a refrigerant cooling device for a variable capacity rotary compressor capable of reducing the temperature of the refrigerant to improve compressor efficiency.

Background technique

Generally speaking, a compressor is a device that uses the power provided by a power generating device such as a motor to apply compression work to air, refrigerant or other special gases, thereby increasing its pressure, and is generally used in the entire industrial field. According to different compression methods, compressors can be divided into volumetric type and turbo type. The positive displacement compressor uses the method of increasing the pressure by reducing the volume, while the turbo compressor uses the method of converting the kinetic energy of the gas into pressure energy for compression. Rotary compressors among positive displacement compressors are mainly used in air conditioners. Recently, with the diversification of the functions of air conditioners, it is also necessary to be able to change the capacity of rotary compressors. For rotary compressors, the method of changing the capacity is mainly the so-called frequency conversion method that uses the well-known frequency conversion motor to control the speed of the compressor. However, due to the high price of the frequency conversion motor itself, it will increase the cost, and according to statistics, most air conditioners are mainly used as refrigerators. Ability is more difficult than the former. Fig. 1 is a structural schematic diagram of an outdoor unit of an air conditioner using a variable capacity rotary compressor in the prior art. Fig. 2 is a p-h curve diagram of a prior art variable capacity rotary compressor. As shown in Fig. 1, the outdoor unit of the air conditioner adopting the variable capacity type rotary compressor in the prior art is mainly arranged inside the casing C of the outdoor unit, which can make the high-temperature and high-pressure gaseous refrigerant become liquid through heat exchange Refrigerant condenser 1; a variable-capacity rotary compressor that is arranged on one side of the condenser 1 and has a plurality of compression devices 2a, 2b inside, thereby selectively compressing the refrigerant once or twice, Hereinafter referred to as the compressor 2; and a connection device capable of selectively supplying refrigerant to each compression device 2a, 2b, so that the compressor 2 operates at different capacities. The connecting device mainly includes a plurality of suction side connecting pipes 11, 12 connected between the outlet of the liquid storage tank 3 in the refrigeration cycle system and the refrigerant suction pipes of the compression devices 2a, 2b; The discharge-side connection pipe 13 between the outlet and the compressor shell; the bypass-side connection pipe 14 connected from the outlet and discharge-side connection pipe 13 of the second compression device 2b to the suction-side connection pipe 11 of the first compression device 2a; Set on the suction side connecting pipe 11 of the first compression device 2a, used to adjust the first on-off valve 15 for refrigerant inflow; set on the discharge side connecting pipe 13, used to adjust the discharge after being compressed by the second compression device 2b The second on-off valve 16 for the refrigerant in the compressor shell; and the third on-off valve installed on the bypass-side connecting pipe 14 for adjusting the refrigerant compressed by the second compression device 2b and flowing into the first compression device 2a 17. In addition, the bypass-side connection pipe 14 and the condenser 1 are respectively provided around the compressor 2 . The working process of the outdoor unit of the air conditioner using the prior art variable capacity rotary compressor with the above structure is as follows: when the driving device of the compressor 2 is powered on, it will rotate, and at the same time, the rotating force will be transmitted to the compressor through the rotating shaft. The first compression device 2a and the second compression device 2b, and properly adjust the opening and closing valves 15, 16, 17 according to the capacity required by the air conditioner, so that the compressor 2 can operate in a powerful mode that generates large-capacity cooling power operation or in an energy-saving mode that produces a small capacity cooling capacity. When running in the strong mode, the first on-off valve 15 and the second on-off valve 16 will be opened simultaneously, and the third on-off valve 17 will be closed, at this time, the refrigerant from the evaporator not shown in the figure will be all Flow into the first compression device 2a and the second compression device 2b for compression, and then the compressed refrigerant is directly discharged to the inside of the compressor shell, and finally flows to the condenser 1 through the refrigerant discharge pipe on the shell, thereby generating 100% cooling power . When operating in the energy-saving mode, the first on-off valve 15 and the second on-off valve 16 will be closed, while the third on-off valve 17 will be opened. At this time, the refrigerant from the evaporator not shown in the figure will only flow into The second compression device 2b performs the first compression, and then flows into the first compression device 2a through the lower muffler through the bypass side connecting pipe 14 for the second compression, and then the compressed refrigerant is discharged to the inside of the compressor shell , and finally flows to the condenser 1 through the refrigerant discharge pipe on the shell, thereby generating a cooling force corresponding to the capacity of the second compression device 2b. However, this prior art variable capacity type rotary compressor has the following problems: As shown in Figure 2, when running in the energy-saving mode, the refrigerant that has been compressed for the first time through the second compression device 2b will become high temperature At this time, if it is sent to the first compression device 2a for secondary compression, the temperature of the refrigerant discharged to the inside of the compressor casing will rise a lot, which will undoubtedly increase the temperature of the drive device installed inside the compressor casing. As a result, not only will the performance of the motor be reduced, but also the size of the condenser needs to be increased in order to improve the heat exchange efficiency of the condenser.

Contents of the invention

In order to solve the above problems, the purpose of the present invention is to provide a cooling system that can reduce the temperature of the refrigerant flowing into the second compression device during energy-saving mode operation, thereby preventing the performance of the motor from deteriorating, and can also keep the size of the condenser unchanged. Refrigerant cooling device for variable capacity rotary compressors that improves heat exchange efficiency.

In order to achieve the above purpose, the refrigerant cooling device of the variable capacity rotary compressor provided by the present invention is set in the outdoor unit of the air conditioner adopting the variable capacity rotary compressor, wherein the casing of the rotary compressor is equipped with multiple A compression device that is connected to the condenser through a connection device, selectively provides refrigerant to the compression device through a connection pipe on the connection device to change the capacity of the compressor, and the refrigerant cooling device of the variable capacity rotary compressor is as follows: A refrigerant cooling component that is connected between multiple compression devices and is cooled by the condensed water dripping from the condenser before the refrigerant is compressed once from any compression device and flows into the next compression device; The refrigerant cooling component is an internal connecting pipe on the connecting device immersed in condensed water.

The refrigerant cooling unit is an insulating part arranged on a part of the connecting pipe of the connecting device and immersed in condensed water.

The refrigerant cooling device of the variable capacity rotary compressor provided by the present invention uses condensed water to cool the refrigerant flowing to the bypass side connecting pipe of another compression device after the first compression, which not only reduces the discharge temperature of the refrigerant , and can also prevent motor performance degradation caused by motor overheating, and can improve heat exchange efficiency while keeping the size of the condenser unchanged, thereby improving the performance of the entire system.

Description of drawings

The refrigerant cooling device of the variable capacity rotary compressor provided by the present invention will be described in detail below with reference to the drawings and specific embodiments.

Fig. 1 is a structural schematic diagram of an outdoor unit of an air conditioner using a variable capacity rotary compressor in the prior art.

Fig. 2 is a p-h curve diagram of a prior art variable capacity rotary compressor.

Fig. 3 is a structural schematic diagram of an outdoor unit of an air conditioner using a variable capacity rotary compressor provided by the present invention.

Fig. 4 is a perspective view of the structure of the condenser in the outdoor unit of the air conditioner adopting the variable capacity rotary compressor provided by the present invention.

Fig. 5 is a p-h curve diagram of the variable capacity rotary compressor provided by the present invention.

The main component numbers in the attached drawings:

1: Condenser 2: Compressor

21, 22: Suction side connecting pipe 23: Discharge side connecting pipe

24: Bypass side connecting pipe 25, 26, 27: No. 1, No. 2, No. 3 on-off valves

Detailed ways

As shown in Figure 3, the outdoor unit of an air conditioner using a variable capacity rotary compressor provided by the present invention mainly includes a device that is arranged inside the casing C of the outdoor unit and can convert the high-temperature and high-pressure gaseous refrigerant into a liquid refrigerant through heat exchange. Condenser 1; a variable-capacity rotary compressor installed on one side of the condenser 1, with multiple compression devices 2a, 2b inside, which can selectively compress the refrigerant once or twice, hereinafter referred to as A compressor 2; and a connection device capable of selectively supplying refrigerant to each of the compression devices 2a, 2b, so that the compressor 2 operates at different capacities. The connecting device mainly includes a plurality of suction side connection pipes 21, 22 connected between the outlet of the liquid storage tank 3 in the refrigeration cycle system and the refrigerant suction pipes of the first compression device 2a and the second compression device 2b; The discharge side connection pipe 23 between the outlet of the second compression device 2b and the compressor casing; the side connecting the suction side connection pipe 21 of the first compression device 2a from the outlet of the second compression device 2b and the discharge side connection pipe 23 Pass-side connecting pipe 24; set on the suction-side connecting pipe 21 of the first compression device 2a, used to adjust the first on-off valve 25 for inflowing refrigerant; set on the discharge-side connecting pipe 23, used to adjust from the second compression The second on-off valve 26 for the refrigerant flowing from the device 2b to the compressor casing; and the third on-off valve provided on the bypass side connecting pipe 24 for regulating the refrigerant flowing from the second compressor device 2b to the first compressor device 2a 27. In addition, as shown in Figure 4, part of the bypass side connecting pipe 24 is located around the condenser 1, that is, part of the bypass side connecting pipe 24 is immersed in the bottom surface of the outdoor unit shell C installed to collect the condenser 1. In the condensed water tray 4 of the condensed water dripping from the surface, or install the bypass side connecting pipe 24 and the condenser 1 around the compressor 2 respectively, and install the above figure in the middle of the bypass side connecting pipe 24 Insulation components such as heat pipes are not shown, and the other end of the insulation components is immersed in the condensed water tray 4 . The working process of the outdoor unit of the air conditioner with the above-mentioned structure and adopting the variable capacity rotary compressor provided by the present invention is as follows: when the driving device is powered on, it will rotate, and at the same time, the rotating force will be transmitted to the first compressor through the rotating shaft. device 2a and the second compression device 2b, and properly adjust the on-off valves 25, 26, 27 according to the capacity required by the air conditioner, so that the compressor 2 can operate in a powerful mode that generates large-capacity cooling power or generate Operates in energy-saving mode with a small cooling capacity. Since the opening and closing of the on-off valves and the flow of the refrigerant during the powerful mode operation and the energy-saving mode operation are the same as those in the prior art, description thereof will be omitted here. Only when operating in the energy-saving mode, the refrigerant that has been compressed once by the second compression device 2b will be discharged from the lower muffler, and then flow to the first compression device 2a through the bypass side connecting pipe 24 for secondary compression, and finally discharged. to the inside of the compressor housing. Since the temperature of the refrigerant rises sharply when it is compressed once in the second compression device 2b, and its temperature rises again when it is compressed twice in the first compression device 2a, there is a phenomenon that the inside of the compressor shell The problem of a sharp rise in temperature. However, the present invention immerses the bypass-side connecting pipe 24 in condensed water, or utilizes a separate insulating part not shown in the figure to reduce the temperature of the refrigerant passing through the bypass-side connecting pipe 24. Therefore, as shown in FIG. Before flowing into the first compression device 2a, its temperature has been lowered to a certain extent, and then it is compressed again, which can prevent the temperature inside the compressor shell from rising excessively, thereby preventing the drive device from overheating, thereby not only improving the performance of the motor The performance of the refrigerant can be improved, and the cooling efficiency of the refrigerant can be improved while keeping the size of the condenser unchanged, thereby improving the performance of the entire system.

Claims (2)

1. A refrigerant cooling device for a variable-capacity rotary compressor, which is installed in an outdoor unit of an air conditioner using a variable-capacity rotary compressor, wherein the casing of the rotary compressor (2) is equipped with multiple The compression device (2a, 2b) connected to the condenser (1) through the connection device, selectively supply refrigerant to the compression device (2a, 2b) through the connection pipe on the connection device to change the capacity of the compressor (2), so The refrigerant cooling device of the variable capacity rotary compressor described above is connected between a plurality of compression devices (2a, 2b), and the refrigerant is compressed once from any compression device (2a, 2b) to the The next compression device (2a, 2b) flows into the refrigerant cooling part that is cooled by the condensed water dripping from the condenser (1); it is characterized in that: the refrigerant cooling part is a connection submerged in the condensed water Part of the connecting pipe on the device. 2. The refrigerant cooling device for variable capacity rotary compressors according to claim 1, characterized in that: said refrigerant cooling components are provided on part of the connecting pipes of the connecting device and are immersed in condensed water. part.

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