Air suction reheating device, air conditioning refrigerant flow path switching system, and switching method thereof

Abstract

The present application relates to air conditioner technical field, specifically is a kind of suction reheating device, air conditioner refrigerant flow path switching system and switching method thereof, including suction reheating device, air conditioner refrigerant flow path switching system and its refrigerant flow path switching method.By the implementation of the present application: heating is changed by the alternate cooperation of control solenoid valve to realize heating flow path, suction reheating device absorbs the heat outside the compressor shell, and the heat of the compressor surface shell is used to reheat the suction side refrigerant, to improve the evaporation temperature and the evaporation pressure, to delay defrosting and improve the heating efficiency of the system.The solenoid valve is used to realize the change of the suction flow path in the system, and the low-pressure side is avoided to heat the overheating and other disadvantages in the refrigeration process.The control mode is changed to realize the general design of the suction reheating device in the refrigeration and heating process.After using the compressor suction reheating device, the suction pipeline can be designed to be the shortest, and the stress design can be simplified.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air conditioners, in particular to an air suction reheating device, an air conditioner refrigerant flow path switching system and a switching method thereof. BACKGROUND

[0002] Common refrigeration devices usually directly enter the compressor suction port from the gas-liquid separator, and the refrigeration and heating refrigerant flow paths are completely the same, the heating temperature is low, the suction temperature and suction pressure are low, and the heat exchanger frequently frosts, resulting in poor heating capacity and energy efficiency during traditional heating, especially in the frosting condition of wet working conditions, and the heating heat is basically derived from the power consumption of the compressor.

[0003] The compressor shell waste heat is currently utilized by using a heat accumulator filled with a phase change material, but there are many problems such as a large volume of the heat accumulator, high cost, and aging of the material. Moreover, the compressor is not wrapped by a large area of the heat accumulator and the flow path is single controlled during refrigeration, resulting in problems such as harmful waste heat during refrigeration, so it is difficult to popularize the utilization of the compressor shell waste heat at present.

[0004] The suction pipe stress is an important factor causing the failure of the current air conditioner suction pipe, which is usually improved by changing the shape, but the problem has not been well solved.

[0005] There is still a lack of an economic and reliable method to utilize the heat of the compressor shell and form a variable flow path control technology to eliminate the long and unstable stress of the suction pipe. SUMMARY

[0006] The purpose of the present application is to provide an air suction reheating device, an air conditioner refrigerant flow path switching system and a switching method thereof to solve the problems raised in the background art.

[0007] To achieve the above-mentioned purpose, the present application provides the following technical scheme: the air suction reheating device comprises an inlet refrigerant pipe, an outlet refrigerant pipe and a refrigerant flow path pipe, the refrigerant flow path pipe is connected between the inlet refrigerant pipe and the outlet refrigerant pipe, the refrigerant flow path pipe is arranged in the form of being wrapped outside the compressor, and the outlet position of the outlet refrigerant pipe is higher than the inlet position of the inlet refrigerant pipe.

[0008] Preferably, the air suction reheating device further comprises a limiting structure, and the limiting structure is fixedly connected with the refrigerant flow path pipe.

[0009] Preferably, the refrigerant flow path pipe is spirally wound along the length direction of the compressor to form a cylindrical structure.

[0010] Preferably, the inner diameter and height of the cylindrical structure formed by winding the refrigerant flow path pipe around the compressor, the length of the refrigerant flow path pipe, and the inner diameters of the inlet refrigerant pipe and the outlet refrigerant pipe are calculated according to the size of the compressor and the heat exchange capacity.

[0011] The application also provides an air conditioner refrigerant flow path switching system using the suction gas reheating device, comprising a first electromagnetic valve, a second electromagnetic valve and a third electromagnetic valve, the first electromagnetic valve is arranged between an inlet refrigerant pipe of the suction gas reheating device and an outlet branch pipe of a gas-liquid separator, the second electromagnetic valve is arranged between an outlet refrigerant pipe of the suction gas reheating device and a suction port of a compressor, and the third electromagnetic valve is arranged on a short circuit pipe connecting the suction port of the compressor and the outlet branch pipe of the gas-liquid separator.

[0012] The application also provides a refrigerant flow path switching method using the air conditioner refrigerant flow path switching system, comprising the following steps: detecting whether the air conditioner is in a heating mode, if not, closing the first electromagnetic valve and the second electromagnetic valve, opening the third electromagnetic valve, and directly returning the low-pressure side refrigerant from the gas-liquid separator to the suction port of the compressor; if yes, further judging whether the outdoor temperature is greater than a first temperature, if the outdoor temperature is above the first temperature, closing the first electromagnetic valve and the second electromagnetic valve, opening the third electromagnetic valve, and directly returning the low-pressure side refrigerant from the gas-liquid separator to the suction port of the compressor; if the outdoor temperature is less than or equal to the first temperature, opening the first electromagnetic valve and the second electromagnetic valve, closing the third electromagnetic valve, realizing that the heating refrigerant flows to the suction gas reheating device and then to the suction port of the compressor, and adjusting an outdoor heat exchange front electronic expansion valve to control the suction superheat degree.

[0013] Preferably, the first temperature is 7℃.

[0014] Beneficial effects:

[0015] (1) The refrigeration and heating variable gas return flow path can directly return the refrigerant to the compressor without harmful superheating; the heating passes through the suction gas reheating device to improve the evaporation temperature and pressure, absorbs the waste heat from the compressor shell, and improves the heating capacity and energy efficiency of the unit.

[0016] (2) The application improves the design of the suction gas pipeline stress, the suction gas reheating device is connected with the compressor by brazing, and the suction port is located at the bottom of the compressor, so that the vibration excitation is small, and the shortest connection design of the suction gas pipeline can be realized. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a schematic diagram of the three-dimensional structure of the suction gas reheating device of the application;

[0018] Figure 2 It is a side view of the suction gas reheating device of the application;

[0019] Figure 3 It is a schematic diagram of the installation of the suction gas reheating device and the compressor of the application;

[0020] Figure 4 It is a schematic diagram of the air conditioner refrigerant flow path switching system of the application;

[0021] Figure 5The principle diagram of the air conditioner refrigerant flow path switching system of the present application is installed in an air conditioning system.

[0022] Figure 6 The flow chart of the switching method of the present application.

[0023] In the figure: inlet refrigerant pipe 1, outlet refrigerant pipe 2, refrigerant flow path pipe 3, limiting structure 4, compressor 5, suction port 6, exhaust port 7, first electromagnetic valve 8, second electromagnetic valve 9, third electromagnetic valve 10, outlet branch pipe 11, suction port low pressure sensor 12, suction port low temperature sensor 13, short circuit pipe 14. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution of the present application clear, complete and the advantages more clear and obvious, the embodiments of the present application are further described in detail below in combination with the drawings. It should be understood that the specific embodiments described here are part of the embodiments of the present application, not all the embodiments, and are only used to explain the embodiments of the present application, and do not limit the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the present application.

[0025] Please refer to Figures 1 to 2 The present embodiment provides a suction reheating device, which comprises an inlet refrigerant pipe 1, an outlet refrigerant pipe 2, a refrigerant flow path pipe 3, and a limiting structure. The refrigerant flow path pipe 3 is in communication between the inlet refrigerant pipe 1 and the outlet refrigerant pipe 2. The refrigerant flow path pipe 3 is arranged in the form of covering the compressor 5. The refrigerant flow path pipe 3 of the present embodiment adopts a D-shaped threaded pipe, which is spirally wound along the length direction of the compressor 5 to form a cylindrical structure. The type of the refrigerant flow path pipe is not limited, and a common round pipe can also be used, and the form of covering the compressor 5 is not limited to the spiral winding form described in the present embodiment. The limiting structure 5 is fixedly connected with the refrigerant flow path pipe 3, and welding fixation is adopted in the present embodiment. By Figure 1 It can be known that the limiting structure 4 of the present embodiment adopts a connecting piece with a flat middle part and bent ends. The flat middle part is welded with the refrigerant flow path pipe 3 contacted, and the bent end parts are welded with the refrigerant flow path pipes 3 located at the bottom and the top respectively, and the welding position is filled with flux. The outlet position of the outlet refrigerant pipe 2 is higher than the inlet position of the inlet refrigerant pipe 1. In normal use, the refrigerant enters from the inlet refrigerant pipe 1 and flows out from the outlet refrigerant pipe 2 from bottom to top. The inlet refrigerant pipe 1 and the outlet refrigerant pipe 2 of the present embodiment are both circular elbow pipes,

[0026] The inner diameter D, height L of the refrigerant flow path tube 3 winding the cylindrical structure of the compressor 5, the length of the refrigerant flow path tube 3, and the inner diameter d of the inlet refrigerant pipe 1 and the outlet refrigerant pipe 2 are calculated according to the size and heat exchange capacity of the compressor 5 and then customized. The materials of the inlet refrigerant pipe 1, the outlet refrigerant pipe 2, and the refrigerant flow path tube 3 can be selected from copper or other materials with high thermal conductivity.

[0027] With reference to Figure 3 The structure of the suction reheat device after being installed with the compressor 5 is shown in the figure. In this embodiment, the compressor and the suction reheat device are connected by brazing, which improves the heat transfer efficiency and increases the fixing strength. The suction reheat device is fixed to the middle and lower part of the compressor 5 and is located below the suction port 6 of the compressor 5.

[0028] With reference to Figure 4 This embodiment also provides an air conditioner refrigerant flow path switching system, which includes a first electromagnetic valve 8, a second electromagnetic valve 9, and a third electromagnetic valve 10. The first electromagnetic valve 8 is arranged between the inlet refrigerant pipe 1 of the suction reheat device and the outlet branch pipe 11 of the gas-liquid separator. The second electromagnetic valve 9 is arranged between the outlet refrigerant pipe 2 of the suction reheat device and the suction port 6 of the compressor 5. The third electromagnetic valve 10 is arranged on the short circuit pipe 14 connecting the suction port 6 of the compressor 5 and the outlet branch pipe 11 of the gas-liquid separator.

[0029] Figure 5 The system principle diagram for installing the air conditioner refrigerant flow path switching system in an air conditioner outdoor unit is shown in the figure. The solid arrows represent the refrigerant flow direction during refrigeration, and the dashed arrows represent the refrigerant flow direction during heating. Figure 4 When the system is in the refrigeration mode, the refrigerant from the outlet branch pipe 11 of the gas-liquid separator flows to the short circuit pipe 14. The third electromagnetic valve 10 is open, the return refrigerant directly flows to the suction port 6 of the compressor 5, is compressed by the compressor 5, and is discharged through the exhaust port 7. In this process, the first electromagnetic valve 8 and the second electromagnetic valve 9 are closed.

[0030] When the system is in the heating mode and meets the environmental temperature control, the refrigerant from the outlet branch pipe 11 of the gas-liquid separator flows to the first electromagnetic valve 8. The first electromagnetic valve 8 and the second electromagnetic valve 9 are open, and the third electromagnetic valve 10 of the short circuit pipe 14 is closed. After passing through the first electromagnetic valve 8, the refrigerant enters the suction reheat device through the inlet refrigerant pipe 1, absorbs heat from the shell of the compressor 5, passes through the outlet refrigerant pipe 2, and returns to the suction port 6 of the compressor 5 through the second electromagnetic valve 9. The refrigerant is compressed by the compressor 5 and discharged through the exhaust port 7, completing the suction reheat process. Figure 4 In the figure, 12 is a suction port low pressure sensor for detecting the suction pressure, and 13 is a suction port low temperature sensor for detecting the suction temperature and outputting the suction superheat degree for the superheat degree control of the electronic expansion valve.

[0031] Referring to Figure 6 The embodiment also provides a refrigerant flow switching method using the air conditioner refrigerant flow switching system. The method comprises the following steps: detecting whether the air conditioner is in a heating mode; if not, closing the first electromagnetic valve and the second electromagnetic valve, and opening the third electromagnetic valve, so that the low-pressure side refrigerant directly returns to the compressor suction port from the gas-liquid separator; if yes, further judging whether the outdoor temperature is greater than 7 DEG C; if the outdoor temperature is greater than 7 DEG C, closing the first electromagnetic valve and the second electromagnetic valve, and opening the third electromagnetic valve, so that the low-pressure side refrigerant directly returns to the compressor suction port from the gas-liquid separator; if the outdoor temperature is less than or equal to 7 DEG C, opening the first electromagnetic valve and the second electromagnetic valve, and closing the third electromagnetic valve, so that the heating refrigerant flows to the suction reheating device and then to the compressor suction port, and the opening degree of the outdoor heat exchange front electronic expansion valve is adjusted to 470 pls, and the valve control still adopts the suction superheat degree control, and the suction superheat degree target value can be appropriately reduced to increase the refrigerant flow.

[0032] Although the foregoing describes the specific embodiments of the present application in detail, so that those skilled in the art can understand the present application, the present application is not limited to the specific embodiments, and all the applications created by using the concept of the present application within the scope of the appended claims and the spirit and scope of the present application are protected.

Claims

1. A method for switching a refrigerant flow path using an air conditioner refrigerant flow path switching system, characterized by: The air conditioner refrigerant flow path switching system comprises a first electromagnetic valve, a second electromagnetic valve, a third electromagnetic valve and a suction reheating device, the suction reheating device comprises an inlet refrigerant pipe, an outlet refrigerant pipe and a refrigerant flow path pipe, the refrigerant flow path pipe is arranged in a form of being wrapped outside the compressor, the outlet refrigerant pipe is arranged at a position higher than the inlet of the inlet refrigerant pipe, the first electromagnetic valve is arranged between the inlet refrigerant pipe of the suction reheating device and the outlet branch pipe of the gas-liquid separator, the second electromagnetic valve is arranged between the outlet refrigerant pipe of the suction reheating device and the suction port of the compressor, and the third electromagnetic valve is arranged on a short circuit pipe connecting the suction port of the compressor and the outlet branch pipe of the gas-liquid separator; the switching method is as follows: detecting whether the air conditioner is in a heating mode, if not, closing the first electromagnetic valve and the second electromagnetic valve, opening the third electromagnetic valve, and the low-pressure side refrigerant directly returns to the suction port of the compressor from the gas-liquid separator; if yes, further judging whether the outdoor temperature is greater than a first temperature, if the outdoor temperature is above the first temperature, closing the first electromagnetic valve and the second electromagnetic valve, opening the third electromagnetic valve, and the low-pressure side refrigerant directly returns to the suction port of the compressor from the gas-liquid separator; if the outdoor temperature is less than or equal to the first temperature, opening the first electromagnetic valve and the second electromagnetic valve, closing the third electromagnetic valve, realizing that the heating refrigerant flows to the suction reheating device and then to the suction port of the compressor, and adjusting the outdoor heat exchange front electronic expansion valve to control the suction superheat degree.

2. The handover method of claim 1, wherein: The first temperature is 7℃.

3. The handover method of claim 1, wherein: The suction reheating device further comprises a limiting structure, which is fixedly connected with the refrigerant flow path pipe.

4. The handover method of claim 1, wherein: The refrigerant flow path pipe is spirally wound along the length direction of the compressor to form a cylindrical structure.

5. The handover method of claim 4, wherein: The inner diameter and height of the cylindrical structure formed by the refrigerant flow path pipe winding the compressor, the length of the refrigerant flow path pipe, and the inner diameters of the inlet refrigerant pipe and the outlet refrigerant pipe are calculated according to the size and heat exchange capacity of the compressor.

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