Heat pump air conditioning unit

Abstract

The invention provides a heat pump air conditioning unit which comprises a four-way reversing valve, the four-way reversing valve has a first state and a second state, in the first state, a first port is communicated with a second port, a third port is communicated with a fourth port, in the second state, the first port is communicated with the fourth port, and the second port is communicated with the third port; an outlet of the compressor is connected with a first port of the reversing valve through a pipeline, and an inlet of the compressor is connected with a third port of the reversing valve through a pipeline; a first port of the reheating coil is connected with a second port of the reversing valve through a first pipeline; a second port of the reheating coil is connected with a first port of the condenser through a second pipeline; a first port of the evaporator is connected with a second port of the condenser through a third pipeline, and a second port of the evaporator is connected with a fourth port of the reversing valve through a pipeline. According to the heat pump air conditioning unit, the reheating coil is used for heating air, and therefore the energy-saving effect is achieved.

Description

Technical Field

[0001] The present application relates to the field of refrigeration equipment, and in particular to a heat pump air conditioning unit capable of achieving dehumidification and reheating as well as heating and dehumidification functions. Background Art

[0002] Nowadays, the use of heat pump air conditioners is becoming more and more popular. Heat pump air conditioners can not only cool the ambient air and remove excess moisture, but also use low-grade heat sources to provide high-grade heat energy, which can comprehensively adjust the environment and achieve the purpose of improving comfort.

[0003] However, in the prior art, heat pump air conditioners in dehumidification mode often reduce the air temperature, resulting in an overcooled indoor environment, which affects human comfort. The prior art relies on electric heaters to reheat the low-temperature air after dehumidification by heat pump air conditioners, which not only consumes a lot of energy, but also does not meet modern green building standards. Summary of the invention

[0004] In view of this, the present application provides a heat pump air conditioning unit that can reheat the low-temperature air after dehumidification by the heat pump air conditioning without relying on an electric heater. Its specific structure includes: a four-way reversing valve, including a first port of the reversing valve, a second port of the reversing valve, a third port of the reversing valve and a fourth port of the reversing valve, the four-way reversing valve includes a first state and a second state, in the first state, the first port of the reversing valve is connected to the second port of the reversing valve, and the third port of the reversing valve is connected to the fourth port of the reversing valve, and in the second state, the first port of the reversing valve is connected to the fourth port of the reversing valve, and the second port of the reversing valve is connected to the third port of the reversing valve; a compressor, whose outlet is connected to the first port of the reversing valve through a pipeline, and whose inlet is connected to the third port of the reversing valve through a pipeline; a reheat coil, including a first port of the reheat coil and a second port of the reheat coil, and the first port of the reheat coil is connected to the second port of the reversing valve through a first pipeline; a condenser, including a first port of the condenser and a second port of the condenser, and the second port of the reheat coil is connected to the first port of the condenser through a second pipeline; an evaporator, including a first port of the evaporator and a second port of the evaporator, the first port of the evaporator is connected to the second port of the condenser through a third pipeline, and the second port of the evaporator is connected to the fourth port of the reversing valve through a pipeline.

[0005] With the above specific structure, when the heat pump air conditioner is in dehumidification mode, the four-way reversing valve enters the first state, and the refrigerant flows out of the compressor and enters the reheat coil through the first pipeline; then enters the condenser through the second pipeline for condensation and heat dissipation; then the cooled refrigerant enters the evaporator through the third pipeline. At this time, the temperature of the evaporator is relatively low, so that the water vapor in the air condenses on the evaporator coil, so that the heat pump air conditioner achieves the dehumidification effect. The air passing through the evaporator enters the room after passing through the reheat coil. The refrigerant in the reheat coil still maintains a relatively high temperature and can heat the air, thereby ensuring that the heat pump air conditioner in the dehumidification state will not cause the indoor temperature to drop. At the same time, it does not rely on electric heating equipment to achieve energy-saving effects.

[0006] As a possible implementation, the second port of the reheat coil is connected to the first port of the evaporator through a fourth pipeline, and a first solenoid valve is provided on the fourth pipeline; the second port of the reversing valve is connected to the first port of the condenser through a fifth pipeline, and a second solenoid valve is provided on the fifth pipeline.

[0007] By adopting the above possible implementation, the first solenoid valve can control the on-off of the fourth pipeline; the second solenoid valve can control the on-off of the fifth pipeline. By connecting the fourth pipeline and the fifth pipeline, the refrigerant in the reheat coil can be recovered.

[0008] As a possible implementation, the evaporator and the reheat coil are disposed adjacent to each other, and an evaporator fan is disposed at the evaporator, and the evaporator fan blows air to the evaporator and the reheat coil in sequence.

[0009] As a possible implementation, an electric heating device is provided at the reheat coil, and the evaporator fan blows air to the evaporator, the reheat coil and the electric heating device in sequence.

[0010] Using the above possible implementation method, in the dehumidification mode, when the air temperature after being heated by the reheat coil cannot reach the air outlet temperature standard of the air conditioner, an electric heating device can be used for auxiliary heating. Compared with using an electric heating device alone to heat the air, the electric heating device combined with the reheat coil to heat the air can reduce energy consumption.

[0011] As a possible implementation manner, a third solenoid valve is provided on the first pipeline.

[0012] By adopting the above possible implementation manner, the third solenoid valve can control the on-off of the first pipeline. By blocking the first pipeline, the refrigerant in the reheat coil can be recovered.

[0013] As a possible implementation manner, a fourth solenoid valve is provided on the second pipeline.

[0014] By adopting the above possible implementation manner, the fourth solenoid valve can control the on-off of the second pipeline. By blocking the second pipeline, the refrigerant in the reheat coil can be recovered.

[0015] As a possible implementation, an electronic expansion valve is provided on the third pipeline.

[0016] By adopting the above possible implementation, the electronic expansion valve can control the flow rate of the refrigerant in the third pipeline. By reducing the flow rate of the refrigerant in the third pipeline, the refrigerant in the reheat coil can be recovered.

[0017] As a possible implementation, a drying filter is provided on the third pipeline.

[0018] As a possible implementation manner, a condenser fan is provided at the condenser.

[0019] As a possible implementation, an intelligent control system is also included, which can control the four-way reversing valve to enter the first state or the second state according to the indoor temperature and humidity, and can also control the opening and closing of the first solenoid valve, the second solenoid valve, the third solenoid valve, the fourth solenoid valve, the electronic expansion valve and the switch of the electric heating device. Correspondingly, the intelligent control system can also control the heat pump air conditioning unit to recycle the refrigerant in the reheat coil. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The various technical features of the present application and the relationship between them are further explained below with reference to the accompanying drawings. The accompanying drawings are exemplary, and some technical features are not shown in actual proportion. In addition, some drawings may omit technical features that are commonly used in the technical field to which the present application belongs and are not essential for understanding and implementing the present application, or additional technical features that are not essential for understanding and implementing the present application may be shown. In other words, the combination of the various technical features shown in the accompanying drawings is not used to limit the present application. In addition, throughout the present application, the same figure numbers refer to the same content. The specific description of the drawings is as follows:

[0021] Figure 1 A schematic diagram of the piping of the heat pump air-conditioning unit in the dehumidification mode involved in the embodiment of the present application;

[0022] Figure 2 A schematic diagram of the piping of the heat pump air-conditioning unit in the heating mode involved in the embodiment of the present application;

[0023] Figure 3 A schematic diagram of the piping of the heat pump air-conditioning unit in the refrigerant recovery mode involved in the embodiment of the present application;

[0024] Figure 4 It is a schematic diagram of a four-way reversing valve in a heat pump air-conditioning unit involved in an embodiment of the present application in a first state;

[0025] Figure 5 This is a schematic diagram of a four-way reversing valve in a heat pump air-conditioning unit in an embodiment of the present application in a second state.

[0026] Explanation of the reference numerals: 10-compressor; 20-four-way reversing valve; 21-first port of the reversing valve; 22-second port of the reversing valve; 23-third port of the reversing valve; 24-fourth port of the reversing valve; 30-reheat coil; 31-first port of the reheat coil; 32-second port of the reheat coil; 40-condenser; 41-condenser fan; 42-first port of the condenser; 43-second port of the condenser; 50-evaporator; 51-evaporator fan; 52-first port of the evaporator; 53-second port of the evaporator; 60-electric heating device; 100-first pipeline; 110-third solenoid valve; 200-second pipeline; 210-fourth solenoid valve; 300-third pipeline; 310-electronic expansion valve; 320-drying filter; 400-fourth pipeline; 410-first solenoid valve; 500-fifth pipeline; 510-second solenoid valve. DETAILED DESCRIPTION

[0027] Below, the specific implementation methods of the present application are described in detail with reference to the accompanying drawings.

[0028] The present application provides a heat pump air conditioning unit, which can reheat the low-temperature air after dehumidification of the heat pump air conditioning without relying on an electric heater. The embodiment of the heat pump air conditioning unit provided by the present application is composed of a four-way reversing valve 20, a compressor 10, a reheat coil 30, a condenser 40, and an evaporator 50.

[0029] The four-way reversing valve 20 includes a first reversing valve port 21, a second reversing valve port 22, a third reversing valve port 23 and a fourth reversing valve port 24. At the same time, the four-way reversing valve 20 includes a first state and a second state. In the first state, Figure 4 As shown, the first port 21 of the reversing valve is connected to the second port 22 of the reversing valve, and the third port 23 of the reversing valve is connected to the fourth port 24 of the reversing valve; in the second state, as Figure 5 As shown, the first port 21 of the reversing valve is connected to the fourth port 24 of the reversing valve, and the second port 22 of the reversing valve is connected to the third port 23 of the reversing valve. The four-way reversing valve 20 can switch between the dehumidification mode and the heating mode of the embodiment of the heat pump air conditioner provided by the present invention by switching between the first state and the second state.

[0030] Among them, Figure 1 , 2 As shown in FIG. 3 , the outlet of the compressor 10 is connected to the first port 21 of the reversing valve through a pipeline, and the inlet of the compressor 10 is connected to the third port 23 of the reversing valve through a pipeline. The compressor 10 can compress low-pressure gaseous refrigerant into high-pressure gaseous refrigerant.

[0031] Among them, Figure 1 , 2 As shown in Figures 3 and 4, the reheat coil 30 includes a first reheat coil port 31 and a second reheat coil port 32. The first reheat coil port 31 is connected to the second reversing valve port 22 via a first pipeline 100. A third solenoid valve 110 is provided on the first pipeline 100, and the third solenoid valve 110 can control the on-off of the first pipeline 100. Refrigerant passes through the reheat coil 30, and the surrounding air can be heated or dehumidified.

[0032] Among them, Figure 1 , 2 As shown in FIG. 3 , the condenser 40 includes a first condenser port 42 and a second condenser port 43, and the second reheat coil port 32 is connected to the first condenser port 42 through a second pipeline 200. A fourth solenoid valve 210 is provided on the second pipeline 200, and the fourth solenoid valve 210 can control the on-off of the second pipeline 200. The condenser 40 can exchange heat between the refrigerant passing through and the environment. A condenser fan 41 is provided at the condenser 40.

[0033] Among them, Figure 1 , 2 As shown in Figure 3, the evaporator 50 includes an evaporator first port 52 and an evaporator second port 53, the evaporator first port 52 is connected to the condenser second port 43 through the third pipeline 300, and the evaporator second port 53 is connected to the reversing valve fourth port 24 through a pipeline. An electronic expansion valve 310 is provided on the third pipeline 300, and the electronic expansion valve 310 can control the flow rate of the refrigerant in the third pipeline 300. A drying filter 320 is also provided on the third pipeline 300, and the drying filter 320 is arranged in series with the electronic expansion valve 310. The evaporator 50 can dehumidify or heat the surrounding air through the refrigerant therein.

[0034] Among them, Figure 1 , 2 As shown in FIG. 3 , the second port 32 of the reheat coil is connected to the first port 52 of the evaporator through a fourth pipeline 400, and a first solenoid valve 410 is provided on the fourth pipeline 400, and the first solenoid valve 410 can control the on-off of the fourth pipeline 400. The second port 22 of the reversing valve is connected to the first port 42 of the condenser through a fifth pipeline 500, and a second solenoid valve 510 is provided on the fifth pipeline 500, and the second solenoid valve 510 can control the on-off of the fifth pipeline 500.

[0035] In this embodiment, if Figure 1 , 2As shown in Figure 3, the evaporator 50 is arranged adjacent to the reheat coil 30, and an evaporator fan 51 is arranged at the evaporator 50, and an electric heating device 60 is arranged at the reheat coil 30. The evaporator fan 51 blows air to the evaporator 50, the reheat coil 30 and the electric heating device 60 in sequence. When the heat pump air-conditioning unit involved in the embodiment of the present application is in the dehumidification mode, when the temperature of the air heated by the reheat coil 30 cannot reach the air outlet temperature standard of the air conditioner, the electric heating device 60 can be used to assist in heating. Compared with using the electric heating device 60 alone to heat the air, the electric heating device 60 cooperates with the reheat coil 30 to heat the air to reduce energy consumption. When the heat pump air-conditioning unit involved in the embodiment of the present application is in the heating mode, when the temperature of the air dehumidified by the reheat coil 30 cannot reach the air outlet temperature standard of the air conditioner, the electric heating device 60 can be used to assist in heating, thereby avoiding excessive temperature drop caused by dehumidification operation.

[0036] The heat pump air conditioning unit involved in the embodiment of the present application can solve the problem of passively lowering the room temperature in the dehumidification mode. When the heat pump air conditioning unit is in the dehumidification mode, Figure 1 As shown, the first solenoid valve 410 and the second solenoid valve 510 are closed, the third solenoid valve 110 and the fourth solenoid valve 210 are opened, and the four-way reversing valve 20 enters the first state. After the high-temperature refrigerant flows out of the compressor 10, it enters the reheat coil 30 through the first pipeline 100; then, the high-temperature refrigerant enters the condenser 40 through the second pipeline 200 for condensation and heat dissipation; next, the cooled low-temperature refrigerant enters the evaporator 50 through the third pipeline 300. At this time, the temperature of the evaporator 50 is relatively low, which can make the water vapor in the air condense on the coil of the evaporator 50, so that the heat pump air conditioner unit can achieve the effect of dehumidification; finally, the refrigerant enters the compressor 10 again from the evaporator 50 through the pipeline to complete the cycle. At the same time, the dry air passing through the evaporator 50 enters the room after passing through the reheat coil 30. The refrigerant in the reheat coil 30 still maintains a relatively high temperature, so that it can heat the air around it, achieving the effect of not lowering the outlet temperature during dehumidification. The heat pump air conditioning unit involved in the embodiment of the present application does not rely on an electric heater to reheat the low-temperature air after dehumidification by the heat pump air conditioning, has low energy consumption, and complies with modern green building standards.

[0037] The heat pump air conditioning unit involved in the embodiment of the present application can solve the problem that dehumidification cannot be performed in the heating mode. When the heat pump air conditioning unit is in the heating mode, Figure 2As shown, the first solenoid valve 410 and the second solenoid valve 510 are closed, the third solenoid valve 110 and the fourth solenoid valve 210 are opened, and the four-way reversing valve 20 enters the second state. After the high-temperature refrigerant flows out of the compressor 10, it enters the evaporator 50 through the pipeline, and the evaporator 50 heats the surrounding air; then, the high-temperature refrigerant enters the condenser 40 through the third pipeline 300 to exchange heat with the environment to cool down; next, the low-temperature refrigerant after cooling enters the reheat coil 30 through the second pipeline 200. The temperature of the reheat coil 30 is relatively low, which can make the water vapor in the surrounding air condense on it, thereby achieving the effect of dehumidification; finally, the refrigerant enters the compressor 10 again from the reheat coil 30 through the first pipeline 100 to complete the cycle. At the same time, the dehumidified air enters the room after passing through the electric heater, and the electric heater can heat the surrounding air again, thereby improving the heating effect to offset the cooling of the air during the dehumidification of the reheat coil 30.

[0038] In addition, the heat pump air-conditioning unit involved in the embodiment of the present application also includes a reheat coil refrigerant recovery mode. After the reheat coil 30 is turned on, the refrigerant enters it, and after the reheat function is deactivated, these refrigerants are often retained in the reheat coil 30 and cannot re-participate in the circulation of the entire air-conditioning system. On the other hand, the reheat coil 30 is isolated from the entire heat pump system by multiple solenoid valves or electronic expansion valves 310, and these valves have a certain internal leakage rate. Even if the reheat function is not turned on, the refrigerant will slowly enter the coil through these valves. Over time, the leakage and accumulation of this refrigerant will cause the system to have a low amount of refrigerant during normal operation, thereby causing the overall energy efficiency of the air-conditioning unit to decrease. This will not only affect the dehumidification and heating effects of the air conditioner, but also increase the operating cost and maintenance difficulty of the equipment. At this time, the heat pump air-conditioning unit involved in the embodiment of the present application can turn on the refrigerant recovery mode: such as Figure 3 As shown, when the heat pump air-conditioning unit is in the refrigerant recovery mode, the first solenoid valve 410 and the second solenoid valve 510 are opened, the third solenoid valve 110 and the fourth solenoid valve 210 are closed, the four-way reversing valve 20 enters the first state, and the refrigerant enters the condenser 40 from the compressor 10 through the fifth pipeline 500; then, the refrigerant continues to flow from the condenser 40 through the third pipeline 300 to the evaporator 50. At this time, the electronic expansion valve 310 is adjusted to reduce the flow rate of the refrigerant in the third pipeline 300, so that the pressure in the third pipeline 300 is less than the pressure in the reheat coil 30. Since the fourth pipeline 400 is opened, under the action of the pressure difference, the refrigerant in the reheat coil 30 enters the evaporator 50 through the fourth pipeline 400, thereby completing the recovery of the refrigerant; finally, the refrigerant enters the compressor 10 again through the pipeline to complete the cycle.

[0039] In this embodiment, the heat pump air conditioning unit is controlled by an intelligent control system. The intelligent control system can control the four-way reversing valve 20 to enter the first state or the second state according to the indoor temperature and humidity, and can also control the opening and closing of the first solenoid valve 410, the second solenoid valve 510, the third solenoid valve 110, the fourth solenoid valve 210, the electronic expansion valve 310 and the switch of the electric heating device 60. In order to achieve the best operating effect, the intelligent control system includes a temperature sensor, a humidity sensor and a pressure sensor, so that parameters such as indoor and outdoor temperature, humidity, and refrigerant pressure can be monitored in real time, and the operating mode and parameters can be automatically adjusted according to the preset target value. In terms of energy saving, the intelligent control system can control the start and stop of the electric heating device 60 by comparing the temperature difference between the supply air and the return air to achieve the best energy saving effect. For the low temperature and humidity problems generated in certain seasons, the intelligent control system can control the start and stop of the dehumidification of the reheat coil 30 and the power of the electric heating device 60 according to the feedback of the indoor temperature and humidity sensor. When the indoor humidity is high, the dehumidification mode is turned on, and the start and stop and power of the electric heating are determined by the outlet air temperature. In solving the problem of energy efficiency degradation after long-term operation, the intelligent control system can intelligently open the refrigerant recovery solenoid valve according to the preset scenario to ensure that the refrigerant in the reheat coil 30 can be recovered to the evaporator 50 in time.

[0040] To summarize, the heat pump air-conditioning unit involved in the embodiment of the present application utilizes the exhaust heat to heat the low-temperature air after dehumidification through the reheat coil 30, replacing or partially replacing the traditional electric heating device 60 to reheat the air-conditioning return air in the dehumidification mode, thereby reducing energy consumption and meeting the needs of modern society for energy conservation and emission reduction; the heat pump air-conditioning unit involved in the embodiment of the present application utilizes the throttled low-temperature refrigerant to dehumidify through the reheat coil 30, and cooperates with the rear-stage electric heating device 60 for reheating, thereby avoiding the problem of passively lowering the temperature during dehumidification in the heating mode, and improving the comfort of the indoor environment; the heat pump air-conditioning unit involved in the embodiment of the present application intelligently turns on the refrigerant recovery function of the reheat coil, so that the refrigerant in the reheat coil 30 re-participates in the working cycle, so it will not be due to the system The amount of internal refrigerant is relatively low, resulting in a decrease in overall efficiency, so that the equipment can operate efficiently for a long time; the evaporator 50, reheat coil 30 and electric heating device 60 in the heat pump air-conditioning unit involved in the embodiment of the present application are compactly arranged, thereby improving the efficiency of return air reheating and return air dehumidification, and the positions of the three can also be adjusted according to different needs and environments, thereby improving the adaptability of the equipment; the dehumidification mode, heating mode and refrigerant recovery mode of the heat pump air-conditioning unit involved in the embodiment of the present application are simple in structure, convenient in operation, and easier to maintain and manage; the valve groups in the heat pump air-conditioning unit involved in the embodiment of the present application are all electric valves, which can realize automatic operation, avoiding the influence of human operation factors on the effect of the heat pump air-conditioning unit involved in the embodiment of the present application, and ensuring the reliability and stability of the process.

[0041] The term "comprising" used throughout the present application should not be interpreted as being limited to what is listed thereafter; it does not exclude other structural elements or steps.

[0042] It can be understood that those skilled in the art can combine the features mentioned in one or more embodiments mentioned in the entire application with the features in other embodiments in any appropriate manner to implement the application.

[0043] Note that the above are only preferred embodiments of the present application and the technical principles used. Those skilled in the art will understand that the present application is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the protection scope of the present application. Therefore, although the present application is described in more detail through the above embodiments, the present application is not limited to the above embodiments, and may also include more other equivalent embodiments without departing from the technical concept of the present application, all of which belong to the protection scope of the present application.

Claims

1. A heat pump air conditioning unit, characterized in that: include: A four-way reversing valve, comprising a first port of the reversing valve, a second port of the reversing valve, a third port of the reversing valve and a fourth port of the reversing valve, wherein the four-way reversing valve comprises a first state and a second state, wherein in the first state, the first port of the reversing valve is communicated with the second port of the reversing valve, and the third port of the reversing valve is communicated with the fourth port of the reversing valve, and in the second state, the first port of the reversing valve is communicated with the fourth port of the reversing valve, and the second port of the reversing valve is communicated with the third port of the reversing valve; A compressor, whose outlet is connected to the first port of the reversing valve through a pipeline, and whose inlet is connected to the third port of the reversing valve through a pipeline; A reheat coil, comprising a first port of the reheat coil and a second port of the reheat coil, wherein the first port of the reheat coil is connected to the second port of the reversing valve through a first pipeline; A condenser, comprising a first condenser port and a second condenser port, wherein the second reheat coil port is connected to the first condenser port via a second pipeline; The evaporator comprises a first port of the evaporator and a second port of the evaporator, wherein the first port of the evaporator is connected to the second port of the condenser through a third pipeline, and the second port of the evaporator is connected to the fourth port of the reversing valve through a pipeline.

2. The heat pump air conditioning unit according to claim 1, characterized in that: The second port of the reheat coil is connected to the first port of the evaporator through a fourth pipeline, and a first solenoid valve is provided on the fourth pipeline; The second port of the reversing valve is connected to the first port of the condenser through a fifth pipeline, and a second solenoid valve is arranged on the fifth pipeline.

3. The heat pump air conditioning unit according to claim 2, characterized in that: The evaporator is disposed adjacent to the reheat coil, and an evaporator fan is disposed at the evaporator. The evaporator fan blows air to the evaporator and the reheat coil in sequence.

4. The heat pump air conditioning unit according to claim 3, characterized in that: The reheat coil is provided with an electric heating device, and the evaporator fan blows air to the evaporator, the reheat coil and the electric heating device in sequence.

5. The heat pump air conditioning unit according to claim 4, characterized in that: The first pipeline is provided with a third solenoid valve.

6. The heat pump air conditioning unit according to claim 5, characterized in that: The second pipeline is provided with a fourth solenoid valve.

7. The heat pump air conditioning unit according to claim 6, characterized in that: The third pipeline is provided with an electronic expansion valve.

8. The heat pump air conditioning unit according to claim 7, characterized in that: The third pipeline is provided with a drying filter.

9. The heat pump air conditioning unit according to any one of claims 1 to 7, characterized in that: A condenser fan is arranged at the condenser.

10. The heat pump air conditioning unit according to claim 7, characterized in that: It also includes an intelligent control system, which can control the four-way reversing valve to enter the first state or the second state according to the indoor temperature and humidity, and can also control the opening and closing of the first solenoid valve, the second solenoid valve, the third solenoid valve, the fourth solenoid valve, the electronic expansion valve and the switch of the electric heating device.

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