Efficient low-temperature dehumidification heat pump system

Abstract

The utility model discloses an efficient low-temperature dehumidification heat pump system which comprises an outdoor unit and an indoor unit, and the outdoor unit comprises a compressor, a four-way reversing valve, an outdoor condenser, a condenser electronic expansion valve and a first one-way valve. The indoor unit comprises an automatic control valve, a reheating condenser, a reheating condenser electronic expansion valve, an evaporator, a second one-way valve and an evaporator electronic expansion valve. The high-efficiency low-temperature dehumidification heat pump system provided by the utility model has a dehumidification condensation heat recovery function, has the advantages of energy conservation and high efficiency compared with a traditional dehumidifier, can realize independent refrigeration and heating functions, and particularly can realize high-efficiency heating at low environment temperature.

Description

Technical Field

[0001] The utility model relates to the technical field of air conditioners, in particular to an efficient low-temperature dehumidifying heat pump system. Background Art

[0002] At present, the dehumidifying units of air conditioners on the market mainly rely on the compressor to operate in the refrigeration mode, so that the surface temperature of the evaporator inside the dehumidifier is reduced to below the dew point temperature of the indoor air. When the indoor air passes through the evaporator, condensation occurs, and the condensed water is discharged through the unit. To ensure indoor comfort, generally, the air is heated by electric auxiliary heating.

[0003] This method has high energy consumption, poor dehumidifying effect at low indoor temperatures, and a single unit operation mode, which cannot meet the cooling and heating needs of users. Especially in cold and humid areas, not only does the unit need to have a dehumidifying function, but also an efficient low-temperature heating function. Summary of the Utility Model

[0004] Aiming at the defects in the prior art, the utility model provides an efficient low-temperature dehumidifying heat pump system to solve the problems of high energy consumption and poor low-temperature dehumidifying effect of traditional refrigeration-type dehumidifiers, and the system can realize separate refrigeration and heating functions.

[0005] The utility model provides an efficient low-temperature dehumidifying heat pump system, including an outdoor unit and an indoor unit;

[0006] The outdoor unit includes a compressor, a four-way reversing valve, an outdoor condenser, a condenser electronic expansion valve, and a first check valve, and the indoor unit includes an automatic control valve, a reheating condenser, a reheating condenser electronic expansion valve, an evaporator, a second check valve, and an evaporator electronic expansion valve;

[0007] The output port of the compressor is connected to the first interface of the four-way reversing valve through a pipeline. The second interface of the four-way reversing valve is connected to the first interface of the outdoor condenser through a pipeline. Two first branch pipelines are branched from the second interface of the outdoor condenser. The condenser electronic expansion valve and the first check valve are respectively arranged on the two first branch pipelines. The first check valve allows the medium to flow in the direction away from the outdoor condenser. After the two first branch pipelines converge, they are connected to the indoor unit through a pipeline and two second branch pipelines are branched in the indoor unit. One of the first branch pipelines is connected to the first interface of the reheating condenser. The automatic control valve is arranged on this second branch pipeline. The second interface of the reheating condenser is connected to the first interface of the evaporator through a pipeline. The evaporator electronic expansion valve is arranged on the pipeline between the reheating condenser and the evaporator. The other second branch pipeline is branched into two third branch pipelines connected to the first interface of the evaporator. The second check valve and the evaporator electronic expansion valve are respectively arranged on the two third branch pipelines. The second check valve allows the medium to flow in the direction away from the evaporator. The second interface of the evaporator is connected to the third interface of the four-way reversing valve through a pipeline. The fourth interface of the four-way reversing valve is connected to the input port of the compressor through a pipeline.

[0008] Further, the outdoor unit further includes a first filter, and the first filter is arranged on the second branch pipeline between the condenser electronic expansion valve and the outdoor condenser.

[0009] Further, the outdoor unit further includes a liquid receiver, and the liquid receiver is arranged on the pipeline between the first branch pipeline and the second branch pipeline.

[0010] Further, the outdoor unit further includes a second filter, and the indoor unit further includes a third filter. The second filter and the third filter are respectively arranged on the pipelines at both ends of the liquid receiver.

[0011] Further, the outdoor unit further includes an economizer. The first interface of the first heat exchange channel in the economizer is connected to the two first branch pipelines through a pipeline. The second interface of the first heat exchange channel in the economizer is connected to the two second branch pipelines through a pipeline. The first interface of the second heat exchange channel in the economizer is connected to the pipeline between the first interface of the first heat exchange channel in the economizer and the first branch pipeline through a pipeline, and an enthalpy-increasing electronic expansion valve is arranged on the pipeline connected to the first interface of the second heat exchange channel in the economizer. The second interface of the second heat exchange channel in the economizer is connected to the enthalpy-increasing port of the compressor through a pipeline.

[0012] Further, the outdoor unit further includes a gas-liquid separator, and the gas-liquid separator is arranged on the pipeline between the input port of the compressor and the fourth interface of the four-way reversing valve.

[0013] Further, the automatic control valve is a solenoid valve.

[0014] The beneficial effects of the present utility model are embodied in:

[0015] The high-efficiency low-temperature dehumidification heat pump system provided by this application has a dehumidification condensation heat recovery function, and has the advantages of energy conservation and high efficiency compared with traditional dehumidifiers. At the same time, this system can realize separate refrigeration and heating functions. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to actual scale.

[0017] Figure 1 is a schematic structural diagram of an embodiment of the present utility model;

[0018] Figure 2 is a schematic diagram of refrigerant flow when the dehumidification mode is operated in an embodiment of the present utility model;

[0019] Figure 3 is a schematic diagram of refrigerant flow when the refrigeration mode is operated in an embodiment of the present utility model;

[0020] Figure 4 is a schematic diagram of refrigerant flow when the heating mode is operated in an embodiment of the present utility model.

[0021] In the drawings, 100, outdoor unit; 200, indoor unit; 1, compressor; 2, gas-liquid separator; 3, enhanced enthalpy electronic expansion valve; 4, economizer; 5, second filter; 6, liquid receiver; 7, second check valve; 8, evaporator electronic expansion valve; 9, evaporator; 10, reheating condenser; 11, reheating condenser electronic expansion valve; 12, solenoid valve; 13, third filter; 14, first check valve; 15, first filter; 16, condenser electronic expansion valve; 17, outdoor condenser; 18, condensing fan; 19, four-way reversing valve. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] The following will describe in detail the embodiments of the technical solutions of the present utility model in conjunction with the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present utility model, and therefore are only examples and cannot be used to limit the protection scope of the present utility model.

[0023] It should be noted that unless otherwise specified, the technical terms or scientific terms used in this application should have the ordinary meaning understood by those skilled in the art to which the present utility model belongs.

[0024] Such as Figures 1 - 4As shown in the figure, the utility model provides an efficient low-temperature dehumidifying heat pump system, which includes an outdoor unit 100 and an indoor unit 200.

[0025] Referring to Figure 1 , the outdoor unit 100 includes a compressor 1, a four-way reversing valve 19, an outdoor condenser 17, a condenser electronic expansion valve 16 and a first check valve 14, and the indoor unit 200 includes an automatic control valve, a reheating condenser 10, a reheating condenser electronic expansion valve 1611, an evaporator 9, a second check valve 7 and an evaporator electronic expansion valve 8.

[0026] The output port of the compressor 1 is connected to the first interface of the four-way reversing valve 19 through a pipeline, the second interface of the four-way reversing valve 19 is connected to the first interface of the outdoor condenser 17 through a pipeline, two first branch pipelines are branched from the second interface of the outdoor condenser 17, the condenser electronic expansion valve 16 and the first check valve 14 are respectively arranged on the two first branch pipelines, the first check valve 14 allows the medium to flow in the direction away from the outdoor condenser 17, the two first branch pipelines are joined and then connected to the indoor unit 200 through a pipeline and two second branch pipelines are branched in the indoor unit 200, one of the first branch pipelines is connected to the first interface of the reheating condenser 10, the automatic control valve is selected as an electromagnetic valve 12 and is arranged on this second branch pipeline, the second interface of the reheating condenser 10 is connected to the first interface of the evaporator 9 through a pipeline, the evaporator electronic expansion valve 8 is arranged on the pipeline between the reheating condenser 10 and the evaporator 9, the other second branch pipeline is branched into two third branch pipelines connected to the first interface of the evaporator 9, the second check valve 7 and the evaporator electronic expansion valve 8 are respectively arranged on the two third branch pipelines, the second check valve 7 allows the medium to flow in the direction away from the evaporator 9, the second interface of the evaporator 9 is connected to the third interface of the four-way reversing valve 19 through a pipeline, and the fourth interface of the four-way reversing valve 19 is connected to the input port of the compressor 1 through a pipeline.

[0027] In a preferred embodiment, the outdoor unit 100 further includes a first filter 15, and the first filter 15 is arranged on the second branch pipeline between the condenser electronic expansion valve 16 and the outdoor condenser 17, and the first filter 15 has a filtering effect on the refrigerant flowing through.

[0028] In a preferred embodiment, the outdoor unit 100 further includes a liquid receiver 6, and the liquid receiver 6 is arranged on the pipeline between the first branch pipeline and the second branch pipeline. The liquid receiver 6 can provide or store excess refrigerant, keep the system pressure relatively stable, and ensure the continuity of the refrigeration effect.

[0029] Preferably, the outdoor unit 100 further includes a second filter 5, and the indoor unit 200 further includes a third filter 13. The second filter 5 and the third filter 13 are respectively disposed on the pipelines at both ends of the liquid receiver 6. The second filter 5 and the third filter 13 can filter out impurities in the refrigerant, prevent them from entering the system circulation, and protect the precision components in the system.

[0030] In a preferred embodiment, the outdoor unit 100 further includes an economizer 4. The first interface of the first heat exchange channel in the economizer 4 is connected to two first branch pipelines through a pipeline. The second interface of the first heat exchange channel in the economizer 4 is connected to two second branch pipelines through a pipeline. The first interface of the second heat exchange channel in the economizer 4 is connected to the pipeline between the first interface of the first heat exchange channel in the economizer 4 and the first branch pipeline through a pipeline, and an enthalpy-increasing electronic expansion valve 3 is provided on the pipeline connecting the first interface of the second heat exchange channel in the economizer 4. The second interface of the second heat exchange channel in the economizer 4 is connected to the enthalpy-increasing port of the compressor 1 through a pipeline.

[0031] In a preferred embodiment, the outdoor unit 100 further includes a gas-liquid separator 2. The gas-liquid separator 2 is disposed on the pipeline between the input port of the compressor 1 and the fourth interface of the four-way reversing valve 19. The gas-liquid separator 2 is used for gas-liquid separation of the refrigerant to ensure that only gaseous refrigerant enters the compressor 1 and to avoid liquid refrigerant entering the cylinder of the compressor 1, thereby effectively preventing the occurrence of liquid hammer phenomenon. Liquid hammer may cause serious failures such as damage to the valve plate of the compressor 1 and rupture of the piston.

[0032] As Figure 2 shown, when the system operates in the dehumidification mode, the dehumidified air can be heated by condensing heat recovery, avoiding the traditional electric heating mode, which is energy-saving and efficient. The working process is as follows: The compressor 1 discharges high-temperature and high-pressure gaseous refrigerant into the four-way reversing valve 19, and then enters the outdoor condenser 17. At this time, the condensing fan 18 of the outdoor condenser 17 does not operate. The refrigerant enters the economizer 4 through the first one-way valve 14, and then enters the liquid receiver 6 through the second filter 5. After coming out of the liquid receiver 6, the refrigerant enters the indoor unit 200, passes through the third filter 13. At this time, the solenoid valve 12 is in the open state. The high-temperature refrigerant enters the reheating condenser 10 through the solenoid valve 12, transfers heat to the air passing through the reheating condenser 10, and then the refrigerant enters the reheating condenser electronic expansion valve 1611 for throttling. The throttled refrigerant enters the evaporator 9. The refrigerant absorbs heat in the evaporator 9 and completes evaporation to become gaseous refrigerant. The temperature and humidity of the air passing through the evaporator 9 are reduced, and then the air is heated up after passing through the reheating condenser 10 and sent into the room. At this time, constant-temperature dehumidification is completed. The reheating of the air does not consume additional energy, but uses the condensing heat generated during the dehumidification process. The gaseous refrigerant formed after evaporation in the evaporator 9 enters the compressor 1 through the four-way reversing valve 19 and the gas-liquid separator 2 to realize the circulation of the refrigerant.

[0033] As Figure 3 shown, when the system operates in the refrigeration mode, its working process is as follows: The compressor 1 discharges the high-temperature and high-pressure gaseous refrigerant into the four-way reversing valve 19, and then enters the outdoor condenser 17. At this time, the condenser fan 18 operates. The refrigerant enters the economizer 4 through the first check valve 14, and then enters the liquid receiver 6 through the second filter 5. After coming out of the liquid receiver 6, the refrigerant enters the indoor unit 200, passes through the third filter 13. At this time, the solenoid valve 12 is in the closed state. The refrigerant is throttled by the evaporator electronic expansion valve 8 and then enters the evaporator 9, where it absorbs heat and completes evaporation, cooling the air passing through the evaporator 9 to achieve the purpose of refrigeration. The gaseous refrigerant formed after evaporation in the evaporator 9 enters the compressor 1 through the four-way reversing valve 19 and the gas-liquid separator 2, realizing the circulation of the refrigerant.

[0034] As Figure 4 shown, when the system operates in the heating mode, its working process is as follows: The compressor 1 discharges the high-temperature and high-pressure gaseous refrigerant into the four-way reversing valve 19, and then enters the evaporator 9 of the indoor unit 200, where it exchanges heat with the air. The temperature of the refrigerant decreases, and the temperature of the air increases. The heated air is sent into the room for heating. The refrigerant coming out of the evaporator 9 enters the liquid receiver 6 of the outdoor unit 100 through the second check valve 7 and the third filter 13. At this time, the solenoid valve 12 is in the closed state. Then the refrigerant enters the economizer 4 through the second filter 5. After coming out of the economizer 4, the refrigerant is divided into two paths, one is the main path and the other is the auxiliary path. Among them, the refrigerant in the main path enters the condenser electronic expansion valve 16, is throttled and then enters the outdoor condenser 17. At this time, the condenser fan 18 operates. The refrigerant completes evaporation in the outdoor condenser 17, and then enters the compressor 1 through the four-way reversing valve 19 and the gas-liquid separator 2. When certain conditions are met, the enthalpy-increasing electronic expansion valve 3 opens, and part of the refrigerant is throttled by the enthalpy-increasing electronic expansion valve 3 and then enters the economizer 4, where it exchanges heat with the liquid refrigerant entering the economizer 4, absorbs heat and evaporates into gaseous refrigerant, and then the gaseous refrigerant enters the enthalpy-increasing port of the compressor 1. This process can optimize the performance of the system, and at the same time can control the exhaust temperature of the compressor 1 under extreme working conditions. At a lower ambient temperature, the system has a higher heating energy efficiency.

[0035] Therefore, the high-efficiency low-temperature dehumidifying heat pump system provided by this application has the function of dehumidifying and condensing heat recovery, and has the advantages of energy saving and high efficiency compared with traditional dehumidifiers. At the same time, the system can realize the functions of separate refrigeration and heating, especially high-efficiency heating at low ambient temperatures.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered by the scope of the claims and the description of the present invention.

Claims

1. A high-efficiency low-temperature dehumidification heat pump system, comprising an outdoor unit and an indoor unit, characterized in that: The outdoor unit includes a compressor, a four-way reversing valve, an outdoor condenser, a condenser electronic expansion valve and a first check valve, and the indoor unit includes an automatic control valve, a reheat condenser, a reheat condenser electronic expansion valve, an evaporator, a second check valve and an evaporator electronic expansion valve; The output port of the compressor is connected to the first interface of the four-way reversing valve through a pipeline, and the second interface of the four-way reversing valve is connected to the first interface of the outdoor condenser through a pipeline. The second interface of the outdoor condenser branches out two first branch pipelines, and the condenser electronic expansion valve and the first one-way valve are arranged on the two first branch pipelines in a one-to-one correspondence. The first one-way valve allows the medium to flow in a direction away from the outdoor condenser. After the two first branch pipelines are merged, they are connected to the indoor unit through a pipeline and two second branch pipelines are branched out in the indoor unit, one of which is connected to the first interface of the reheat condenser. The automatic control The valve is arranged on the second branch pipeline, the second interface of the reheat condenser is connected to the first interface of the evaporator through a pipeline, the evaporator electronic expansion valve is arranged on the pipeline between the reheat condenser and the evaporator, the other second branch pipeline is divided into two third branch pipelines connected to the first interface of the evaporator, the second one-way valve and the evaporator electronic expansion valve are arranged on the two third branch pipelines in a one-to-one correspondence, the second one-way valve allows the medium to flow in the direction away from the evaporator, the second interface of the evaporator is connected to the third interface of the four-way reversing valve through a pipeline, and the fourth interface of the four-way reversing valve is connected to the input port of the compressor through a pipeline.

2. The high-efficiency low-temperature dehumidification heat pump system according to claim 1 is characterized in that: The outdoor unit further comprises a first filter, which is arranged on a second branch pipe between the condenser electronic expansion valve and the outdoor condenser.

3. The high-efficiency low-temperature dehumidification heat pump system according to claim 1 is characterized in that: The outdoor unit further includes a liquid reservoir, which is disposed on the pipeline between the first branch pipeline and the second branch pipeline.

4. The high-efficiency low-temperature dehumidification heat pump system according to claim 3 is characterized in that: The outdoor unit further includes a second filter, and the indoor unit further includes a third filter. The second filter and the third filter are respectively arranged on pipelines at both ends of the liquid reservoir.

5. The high-efficiency low-temperature dehumidification heat pump system according to claim 1 is characterized in that: The outdoor unit also includes an economizer, wherein the first interface of the first heat exchange channel in the economizer is connected to the two first branch pipelines through a pipeline, the second interface of the first heat exchange channel in the economizer is connected to the two second branch pipelines through a pipeline, the first interface of the second heat exchange channel in the economizer is connected to the pipeline between the first interface of the first heat exchange channel in the economizer and the first branch pipeline through a pipeline, and an enthalpy-increasing electronic expansion valve is provided on the pipeline connected to the first interface of the second heat exchange channel in the economizer, and the second interface of the second heat exchange channel in the economizer is connected to the enthalpy-increasing port of the compressor through a pipeline.

6. The high-efficiency low-temperature dehumidification heat pump system according to claim 1 is characterized in that: The outdoor unit further comprises a gas-liquid separator, which is arranged on a pipeline between an input port of the compressor and a fourth interface of the four-way reversing valve.

7. The high-efficiency low-temperature dehumidification heat pump system according to claim 1 is characterized in that: The automatic control valve is a solenoid valve.

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