Heat pump air conditioning unit

Abstract

The utility model 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 realizing dehumidification reheating and heating dehumidification functions. BACKGROUND

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

[0003] However, in the prior art, the heat pump air conditioner in dehumidification mode often causes the air temperature to decrease, resulting in overcooling of the indoor environment and affecting human comfort. The prior art relies on an electric heater to reheat the low-temperature air after dehumidification of the heat pump air conditioner, which not only has high energy consumption, but also does not meet the modern green building standards. CONTENT OF THE INVENTION

[0004] Therefore, the present application provides a heat pump air conditioning unit capable of reheating low-temperature air after dehumidification of the heat pump air conditioner without relying on an electric heater. The specific structure includes: a four-way reversing valve including a reversing valve first port, a reversing valve second port, a reversing valve third port, and a reversing valve fourth port, the four-way reversing valve including a first state and a second state, in the first state, the reversing valve first port and the reversing valve second port are in communication, and the reversing valve third port and the reversing valve fourth port are in communication, in the second state, the reversing valve first port and the reversing valve fourth port are in communication, and the reversing valve second port and the reversing valve third port are in communication; a compressor, the outlet of which is connected to the reversing valve first port through a pipeline, and the inlet of which is connected to the reversing valve third port through a pipeline; a reheating coil including a reheating coil first port and a reheating coil second port, the reheating coil first port being connected to the reversing valve second port through a first pipeline; a condenser including a condenser first port and a condenser second port, the reheating coil second port being connected to the condenser first port through a second pipeline; an evaporator including an evaporator first port and an evaporator second port, the evaporator first port being connected to the condenser second port through a third pipeline, and the evaporator second port being connected to the reversing valve fourth port through a pipeline.

[0005] With the above specific structure, when the heat pump air conditioning unit is in the dehumidification mode, the four-way reversing valve enters the first state, the refrigerant flows out of the compressor and enters the reheating coil through the first pipeline; then it enters the condenser through the second pipeline to be condensed and radiated; next, 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 conditioning unit achieves the effect of dehumidification. The air passing through the evaporator enters the indoor through the reheating coil, and the refrigerant in the reheating coil still maintains a relatively high temperature, which can heat the air, so as to ensure that the heat pump air conditioning unit in the dehumidification state will not cause the indoor temperature to decrease, and at the same time, the effect of energy saving is realized without relying on the electric heating device.

[0006] As a possible implementation, the second port of the reheating coil is connected with the first port of the evaporator through a fourth pipeline, and a first electromagnetic valve is arranged on the fourth pipeline; the second port of the reversing valve is connected with the first port of the condenser through a fifth pipeline, and a second electromagnetic valve is arranged on the fifth pipeline.

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

[0008] As a possible implementation, the evaporator and the reheating coil are arranged adjacently, and an evaporator fan is arranged at the evaporator, which blows air to the evaporator and the reheating coil in sequence.

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

[0010] With the above possible implementation, when the temperature of the air heated by the reheating coil cannot reach the air outlet temperature standard of the air conditioner in the dehumidification mode, the electric heating device can be used to assist in heating. Compared with using the electric heating device alone to heat the air, the electric heating device cooperating with the reheating coil to heat the air can reduce energy consumption.

[0011] As a possible implementation, a third electromagnetic valve is arranged on the first pipeline.

[0012] With the above possible implementation, the third electromagnetic valve can control the on-off of the first pipeline. By blocking the first pipeline, the refrigerant in the reheating coil can be recovered.

[0013] As a possible implementation, a fourth electromagnetic valve is arranged on the second pipeline.

[0014] With the above possible implementation manners, the fourth electromagnetic valve can control the opening and closing of the second pipeline. By blocking the second pipeline, the recovery of the refrigerant in the reheating coil can be realized.

[0015] As one possible implementation manner, an electronic expansion valve is arranged on the third pipeline.

[0016] With the above possible implementation manners, the electronic expansion valve can control the flow of the refrigerant in the third pipeline. By reducing the flow of the refrigerant in the third pipeline, the recovery of the refrigerant in the reheating coil can be realized.

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

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

[0019] As one possible implementation manner, a smart control system is further included, which can control the four-way reversing valve to enter the first state or the second state according to the temperature and humidity in the room, and can also control the opening and closing of the first electromagnetic valve, the second electromagnetic valve, the third electromagnetic valve, the fourth electromagnetic valve, the electronic expansion valve, and the switch of the electric heating device. Correspondingly, the smart control system can also control the heat pump air conditioning unit to recover the refrigerant in the reheating coil. BRIEF DESCRIPTION OF DRAWINGS

[0020] The various technical features of the present application and the relationship between them will be further described below with reference to the accompanying drawings. The drawings are exemplary, some technical features are not shown in actual proportion, and some technical features in the drawings can be omitted, which are conventional 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 are shown, which are not essential for understanding and implementing the present application, that is, the combination of various technical features shown in the drawings is not used to limit the present application. In addition, the same reference signs refer to the same contents throughout the present application. The specific drawings are as follows:

[0021] Figure 1 A schematic diagram of the pipeline of the heat pump air conditioning unit in the dehumidification mode according to the embodiment of the present application;

[0022] Figure 2 A schematic diagram of the pipeline of the heat pump air conditioning unit in the dehumidification and heating mode according to the embodiment of the present application;

[0023] Figure 3 A schematic diagram of the pipeline of the heat pump air conditioning unit in the refrigerant recovery mode according to the embodiment of the present application;

[0024] Figure 4 A schematic diagram of the four-way reversing valve in the first state in the heat pump air conditioning unit according to the embodiment of the present application;

[0025] Figure 5 This is a schematic diagram of the four-way reversing valve in the heat pump air conditioning unit according to the embodiments of this application in the second state.

[0026] Explanation of reference numerals in the attached diagram: 10-Compressor; 20-Four-way reversing valve; 21-First port of reversing valve; 22-Second port of reversing valve; 23-Third port of reversing valve; 24-Fourth port of reversing valve; 30-Reheat coil; 31-First port of reheat coil; 32-Second port of reheat coil; 40-Condenser; 41-Condenser fan; 42-First port of condenser; 43-Second port of condenser; 50-Evaporator; 51-Evaporator fan; 52-First port of evaporator; 53-Second port of 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-Drier filter; 400-Fourth pipeline; 410-First solenoid valve; 500-Fifth pipeline; 510-Second solenoid valve. Detailed Implementation

[0027] The specific embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0028] This application provides a heat pump air conditioning unit capable of reheating the low-temperature air after dehumidification by the heat pump air conditioner without relying on an electric heater. The embodiment of the heat pump air conditioning unit provided in this application consists 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 directional valve 20 includes a first port 21, a second port 22, a third port 23, and a fourth port 24. The four-way directional valve 20 also has a first state and a second state. In the first state, as... 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 dehumidification mode and heating mode in the embodiments of the heat pump air conditioning unit provided in this application by switching between the first state and the second state.

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

[0031] Among them, such as Figure 1 , 2 As shown in Figure 3, 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 installed on the first pipeline 100, which can control the opening and closing of the first pipeline 100. Refrigerant flows through the reheat coil 30, which can heat or dehumidify the surrounding air.

[0032] Among them, such as Figure 1 , 2 As shown in Figure 3, the condenser 40 includes a first condenser port 42 and a second condenser port 43. The second reheat coil port 32 is connected to the first condenser port 42 via a second pipe 200. A fourth solenoid valve 210 is installed on the second pipe 200, which can control the opening and closing of the second pipe 200. The condenser 40 can exchange heat between the refrigerant passing through it and the environment. A condenser fan 41 is installed at the condenser 40.

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

[0034] Among them, such as Figure 1 , 2 As shown in Figure 3, the second port 32 of the reheat coil is connected to the first port 52 of the evaporator via a fourth pipe 400. A first solenoid valve 410 is installed on the fourth pipe 400, which can control the opening and closing of the fourth pipe 400. The second port 22 of the reversing valve is connected to the first port 42 of the condenser via a fifth pipe 500. A second solenoid valve 510 is installed on the fifth pipe 500, which can control the opening and closing of the fifth pipe 500.

[0035] In this embodiment, as Figure 1 , 2, 3, the evaporator 50 is arranged adjacent to the reheating coil 30, the evaporator 50 is provided with an evaporator fan 51, the reheating coil 30 is provided with an electric heating device 60, and the evaporator fan 51 blows air to the evaporator 50, the reheating coil 30 and the electric heating device 60 in sequence. The heat pump air conditioning unit related to the embodiment of the application can use the electric heating device 60 to assist in heating when the air temperature after heating of the reheating coil 30 cannot reach the air outlet temperature standard of the air conditioner in the dehumidification mode. Compared with the use of the electric heating device 60 alone to heat the air, the electric heating device 60 cooperates with the reheating coil 30 to heat the air, which can reduce energy consumption. The heat pump air conditioning unit related to the embodiment of the application can use the electric heating device 60 to assist in heating when the air temperature after dehumidification of the reheating coil 30 cannot reach the air outlet temperature standard of the air conditioner in the heating mode, thereby avoiding excessive temperature drop caused by dehumidification operation.

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

[0037] The heat pump air conditioning unit related to the embodiment of the 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, as shown in Figure 2As shown, the first electromagnetic valve 410 and the second electromagnetic valve 510 are closed, the third electromagnetic valve 110 and the fourth electromagnetic valve 210 are opened, the four-way reversing valve 20 enters the second state, the high-temperature refrigerant flows out from the compressor 10, enters the evaporator 50 through the pipeline, and heats the surrounding air; then, the high-temperature refrigerant enters the condenser 40 through the third pipeline 300 and exchanges heat with the environment to be cooled; next, the low-temperature refrigerant after cooling enters the reheating coil 30 through the second pipeline 200, the reheating coil 30 has a lower temperature and can make the water vapor in the surrounding air condense on it, thereby achieving the effect of dehumidification; finally, the refrigerant from the reheating coil 30 enters the compressor 10 again through the first pipeline 100, and the cycle is completed. At the same time, the air after dehumidification enters the indoor through the electric heater, which can heat the surrounding air again, thereby improving the heating effect to offset the cooling of the air by the reheating coil 30 when dehumidifying.

[0038] In addition, the heat pump air conditioning unit related to the embodiments of the present application also includes a refrigerant recovery mode of the reheating coil. After the reheating coil 30 is opened, the refrigerant enters it, and after the reheating function is disabled, these refrigerants are often stranded in the reheating coil 30 and cannot participate in the entire air conditioning system cycle again. On the other hand, the reheating coil 30 is isolated from the entire heat pump system through multiple electromagnetic valves or electronic expansion valves 310, and these valve parts have a certain internal leakage rate. Even if the reheating function is not turned on, the refrigerant will slowly enter the coil through these valve parts. With the passage of time, this leakage and accumulation of refrigerant will cause the refrigerant amount to be low during normal operation of the system, thereby causing the overall energy efficiency of the air conditioning unit to decrease. This not only affects the dehumidification and heating effect of the air conditioner, but also increases the operating cost and maintenance difficulty of the equipment. At this time, the heat pump air conditioning unit related to the embodiments of the present application can open the refrigerant recovery mode: as shown, Figure 3 As shown, when the heat pump air conditioning unit is in the refrigerant recovery mode, the first electromagnetic valve 410 and the second electromagnetic valve 510 are opened, the third electromagnetic valve 110 and the fourth electromagnetic 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 to the evaporator 50 through the third pipeline 300, at this time, the electronic expansion valve 310 is adjusted to reduce the flow of refrigerant in the third pipeline 300, so that the pressure in the third pipeline 300 is less than the pressure in the reheating coil 30, and due to the opening of the fourth pipeline 400, the refrigerant in the reheating coil 30 enters the evaporator 50 through the fourth pipeline 400 under the action of the pressure difference, thereby completing the recovery of the refrigerant; finally, the refrigerant enters the compressor 10 again through the pipeline to complete the cycle.

[0039] In the present embodiment, the heat pump air conditioning unit is controlled using an intelligent control system. The intelligent control system can control the four-way valve 20 to enter the first state or the second state according to the temperature and humidity in the room, and can also control the opening and closing of the first electromagnetic valve 410, the second electromagnetic valve 510, the third electromagnetic valve 110, the fourth electromagnetic valve 210, and the electronic expansion valve 310, and the switching of the electric heating device 60. In order to achieve the best operating effect, the intelligent control system includes temperature sensors, humidity sensors, and pressure sensors, so that the indoor and outdoor temperature, humidity, refrigerant pressure, and other parameters can be monitored in real time, and the operating mode and parameters can be automatically adjusted according to the target values preset in advance. 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, so as to achieve the best energy saving effect. For the problem of low temperature and humidity in some seasons, the intelligent control system can control the start and stop of the dehumidification of the reheating coil 30 and the power of the electric heating device 60 according to the feedback of the indoor temperature and humidity sensors. When the indoor humidity is high, the dehumidification mode is started, and the start and stop and power of the electric heating are determined by the outlet air temperature. In terms of solving the problem of energy efficiency decline after long-term operation, the intelligent control system can intelligently start the refrigerant recovery electromagnetic valve according to the preset scene, to ensure that the refrigerant in the reheating coil 30 can be recovered to the evaporator 50 in time.

[0040] In summary, the heat pump air conditioning unit related to the present embodiment uses the exhaust heat of the reheating coil 30 to heat the low-temperature air after dehumidification, replacing or partially replacing the traditional electric heating device 60 to reheat the return air of the air conditioner in the dehumidification mode, thereby reducing energy consumption and meeting the demand for energy saving and emission reduction in modern society. The heat pump air conditioning unit related to the present embodiment uses throttled low-temperature refrigerant to dehumidify through the reheating coil 30, and cooperates with the electric heating device 60 in the rear section to restore the temperature, thereby avoiding the problem of passive reduction of air temperature during dehumidification in the heating mode, and improving the comfort of the indoor environment. The heat pump air conditioning unit related to the present embodiment intelligently starts the refrigerant recovery function of the reheating coil, so that the refrigerant in the reheating coil 30 participates in the working cycle again, thus preventing the overall efficiency from being reduced due to the low amount of refrigerant in the system, and enabling the equipment to operate efficiently for a long time. The evaporator 50, the reheating coil 30, and the electric heating device 60 in the heat pump air conditioning unit related to the present embodiment are arranged compactly, thereby improving the efficiency of return air reheating and return air dehumidification, and the positions of the three can 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 related to the present embodiment have simple structures and are easy to operate, maintain, and manage. The valves in the heat pump air conditioning unit related to the present embodiment are all electric valves, which can realize automatic operation and avoid the influence of human operation factors on the effect of the heat pump air conditioning unit related to the present embodiment, thereby ensuring the reliability and stability of the process.

[0041] The term "comprising" as used in the full text of the application should not be interpreted as limiting to the listed features; it does not exclude other structural features or steps.

[0042] It will be understood by the skilled person that features mentioned in one or more embodiments mentioned throughout the present application can be combined with features in other embodiments in any appropriate manner to implement the present application.

[0043] It should be noted that the above only describes the preferred embodiments of the present application and the technical principles applied. It will be understood by the skilled person that the present application is not limited to the specific embodiments described herein, and that various obvious changes, reconfigurations and substitutions can be made by the skilled person without departing from the scope of the present application. Therefore, although the present application has been described in detail through the above embodiments, the present application is not limited to the above embodiments, and more other equivalent embodiments can be included without departing from the technical concept of the present application, and all fall within the scope of the present application.

Claims

1. A heat pump air conditioning unit characterized by, Comprise: four-way reversing valve, including reversing valve first port, reversing valve second port, reversing valve third port and reversing valve fourth port, the four-way reversing valve includes first state and second state, in the first state the reversing valve first port and the reversing valve second port are communicated, the reversing valve third port and the reversing valve fourth port are communicated, in the second state the reversing valve first port and the reversing valve fourth port are communicated, the reversing valve second port and the reversing valve third port are communicated; Compressor, its outlet is connected with the reversing valve first port through pipeline, its inlet is connected with the reversing valve third port through pipeline; Reheat coil, including reheat coil first port and reheat coil second port, the reheat coil first port is connected with the reversing valve second port through first pipeline; Condenser, including condenser first port and condenser second port, the reheat coil second port is connected with the condenser first port through second pipeline; Evaporator, including evaporator first port and evaporator second port, the evaporator first port is connected with the condenser second port through third pipeline, the evaporator second port is connected with the reversing valve fourth port through pipeline.

2. The heat pump air conditioning unit according to claim 1, wherein the reheat coil second port is connected with the evaporator first port through fourth pipeline, and a first electromagnetic valve is arranged on the fourth pipeline; The reversing valve second port is connected with the condenser first port through fifth pipeline, and a second electromagnetic valve is arranged on the fifth pipeline. The evaporator and the reheat coil are arranged adjacently, and an evaporator fan is arranged at the evaporator, and the evaporator fan blows air to the evaporator and the reheat coil in sequence.

3. The heat pump air conditioning unit of claim 2, wherein, An electric heating device is arranged at the reheat coil, and the evaporator fan blows air to the evaporator, the reheat coil and the electric heating device in sequence.

4. The heat pump air conditioning unit of claim 3, wherein, A third electromagnetic valve is arranged on the first pipeline.

5. The heat pump air conditioning unit of claim 4, wherein, A fourth electromagnetic valve is arranged on the second pipeline.

6. The heat pump air conditioning unit of claim 5, wherein, An electronic expansion valve is arranged on the third pipeline.

7. The heat pump air conditioning unit of claim 6, wherein, A drying filter is arranged on the third pipeline.

8. The heat pump air conditioning unit of claim 7, wherein, A condenser fan is arranged at the condenser.

9. The heat pump air conditioning unit according to any one of claims 1-7, wherein, Further comprising an intelligent control system, which can control the four-way reversing valve to enter the first state or the second state according to the temperature and humidity in the room, and can also control the opening and closing of the first electromagnetic valve, the second electromagnetic valve, the third electromagnetic valve, the fourth electromagnetic valve and the electronic expansion valve, and the switch of the electric heating device.

10. The heat pump air conditioning unit of claim 7, wherein, ​

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