CN109595848B - A triple air-conditioning hot water system - Google Patents

Abstract

The invention discloses a triple-generation air-conditioning and water-heating system which comprises a compressor, a first heat exchanger, a liquid storage tank, a second heat exchanger, a gas-liquid separator, a third heat exchanger, a reversing valve and a throttling device. The invention controls the flow direction of the refrigerant, so that the system has four modes of simultaneous refrigeration and heating, independent refrigeration, independent heating and transitional seasonal operation. In summer, the system can run and simultaneously perform refrigeration and heating to meet requirements, and when the heat meets the requirements, the system can be switched to an independent refrigeration mode to meet the requirement of refrigeration capacity; under the working condition in winter, the system can be switched to a single heating mode to meet the requirement, meanwhile, the outdoor heat exchanger with two paths increases the convenience of defrosting, and the heating effect is not influenced; in a transition season, after the indoor cold quantity meets the use requirement, the system can disperse the redundant cold quantity to the outdoor ambient air through the third heat exchanger without any other auxiliary device, and has the advantages of convenient control, simple structure and good stability.

Description

A triple air-conditioning hot water system

technical field

The invention relates to the technical field of air conditioners and heat pumps, and more particularly, to a triple supply air conditioner and hot water system.

Background technique

In a variety of civil and industrial applications, both cold and hot water need to be provided at the same time. The current combined cooling and heating system mainly includes a combined cooling and heating system based on a heat engine, a combined cooling, heating and power system, and a heat pump heat recovery combined cooling and heating system. system. The combined cooling and heating system based on the heat engine improves the comprehensive utilization efficiency of energy to a certain extent, but still mainly consumes fossil energy such as natural gas, which has no advantages in environmental protection; the combined cooling, heating and power is based on energy cascade utilization, which can improve energy It has the advantages of comprehensive utilization efficiency, reduction of pollutant discharge, and alleviation of electricity shortage. However, its scale is large, and it is generally divided into building type, regional type and industrial type, which is not suitable for small places.

At present, there are many forms of combined cooling and heating heat pump systems, such as the patent number CN206056012U. Although the purpose of combined cooling and heating can be achieved, because the system structure is too simple and the operation mode is single, the balance can only be achieved by controlling the valve or bypass. Or it cannot be adjusted, and it can only meet the adjustment of combined cooling and heating and unbalanced adjustment in very rare cases, mostly for the recovery of heat or cooling capacity while cooling or heating. Patent No. CN106679223A adopts a single four-way valve, which can adjust the operation mode of the unit through the reversing function of the four-way valve to solve the problem of unbalanced supply and demand of cold and heat. , there will be a phenomenon of thermal imbalance. The patent CN201715778U adopts a double four-way valve structure, and combines the auxiliary function of the valve to realize a variety of operation modes, which can solve the problem of unbalanced supply of cold and heat. However, due to the large number of valves, the system structure is complex, the manufacturing cost is high, and the system It is not easy to control, the operation stability is poor, and because the above-mentioned system heat exchangers are in a parallel structure, the refrigerant distribution will be uneven.

SUMMARY OF THE INVENTION

In order to overcome the deficiencies of the prior art, the present invention provides a triple-supply air-conditioning and hot-water system, which has multiple operation modes, and at the same time has a simple structure, good stability and convenient control.

The technical scheme adopted by the present invention to solve its technical problems is:

A triple-supply air-conditioning and hot water system includes a compressor, a first heat exchanger, a liquid storage tank, a second heat exchanger, a gas-liquid separator and a third heat exchanger, and the outlet of the compressor is connected to the first heat exchanger. The inlet of a heat exchanger, the outlet of the first heat exchanger is connected to the inlet of the liquid storage tank through a first pipe, the liquid storage tank pipe is connected to the inlet of the second heat exchanger, and the first pipe is connected to the inlet of the liquid storage tank. A first throttling device is arranged between the second heat exchanger and the liquid storage tank, the outlet pipe of the second heat exchanger is connected to the inlet of the gas-liquid separator, and the outlet of the gas-liquid separator is connected to the At the inlet of the compressor, the third heat exchanger includes a connected a interface and a b interface and a connected c interface and a d interface, and the liquid storage tank is connected to the The a interface and the c interface are connected, and the second pipeline and the third pipeline are respectively provided with a second throttling device and a third throttling device, and the first pipeline is provided with a first reversing valve, so The first reversing valve is connected to the fourth pipeline, the other end of the fourth pipeline is connected to the d interface, the fourth pipeline is provided with a third reversing valve, and the third reversing valve passes through the fifth pipeline Connect the gas-liquid separator, the fourth pipeline is located between the first reversing valve and the third reversing valve and is connected with a sixth pipeline, and the other end of the sixth pipeline is connected to the b interface, so The sixth pipeline is provided with a second reversing valve, the second reversing valve and the fifth pipeline are connected through an eighth pipeline, and the first pipeline is located between the first heat exchanger and the first A seventh pipeline is arranged between the reversing valves, and the other end of the seventh pipeline is connected to the position of the fourth pipeline located between the first reversing valve and the sixth pipeline.

Preferably, the first pipeline is provided with a first one-way valve between the first reversing valve and the liquid storage tank.

Preferably, the fifth pipeline is provided with a second one-way valve between the gas-liquid separator and the eighth pipeline.

Preferably, the first reversing valve, the second reversing valve and the third reversing valve are all three-way reversing valves.

Preferably, the liquid storage tank is a four-port liquid storage tank, and the first pipeline, the second pipeline, the third pipeline and the pipeline between the liquid storage tank and the second heat exchanger are respectively connected to the Different connections for the reservoir.

Preferably, the first throttling device, the second throttling device and the third throttling device are electronic expansion valves or thermal expansion valves or capillary tubes.

Preferably, the first heat exchanger and the second heat exchanger are both jacketed water-refrigerant heat exchangers, and the third heat exchanger is a finned air-refrigeration with more than two branches agent heat exchanger.

The beneficial effects of the present invention are: the present invention controls the flow direction of the refrigerant by setting a plurality of reversing valves and throttling devices respectively, so that the system has four modes of simultaneous cooling and heating, independent cooling, independent heating and transitional season operation. In summer working conditions, when the demand for cold and heat is large, the cooling and heating mode can be operated at the same time to meet the requirements. When the heat meets the requirements and a large amount of cooling is needed, the system can be switched to separate cooling mode To meet the cooling demand; in winter conditions, when the heat demand is large, the system can be switched to a separate heating mode to meet the requirements; in the transitional season, when a small amount of cooling and more heat are required, the system can be Switch to the transitional season operation mode to dissipate the excess cooling capacity to the outdoor ambient air through the third heat exchanger, and the system can adjust the cooling capacity to the outdoor ambient air by changing the heat exchange area of the third heat exchanger. Meet the different cooling needs in the transition season, while ensuring the supply of heat. It does not need any other auxiliary devices, and has the advantages of energy saving and environmental protection, convenient control, simple structure and good stability.

Description of drawings

FIG. 1 is a schematic structural diagram of a triple supply air conditioning and hot water system of the present invention.

Among them: 1-compressor, 2-first heat exchanger, 3-first reversing valve, 4-liquid storage tank, 5-first throttling device, 6-second heat exchanger, 7-gas-liquid separation device, 8-second throttle device, 9-third throttle device, 10-third heat exchanger, 11-fan, 12-second reversing valve, 13-third reversing valve, 14-first Pipe, 15-second pipe, 16-third pipe, 17-fourth pipe, 18-fifth pipe, 19-sixth pipe, 20-seventh pipe, 21-eighth pipe, 22-first one-way valve, 23 - second one-way valve.

Detailed ways

The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and embodiments. The following examples are intended to illustrate the present invention, but not to limit the scope of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

Referring to FIG. 1, a triple air-conditioning and hot water supply system in this embodiment includes a compressor 1, a first heat exchanger 2, a liquid storage tank 4, a second heat exchanger 6, a gas-liquid separator 7 and a first heat exchanger 7. Three heat exchangers 10, the outlet of the compressor 1 is connected to the inlet of the first heat exchanger 2, the outlet of the first heat exchanger 2 is connected to the inlet of the liquid storage tank 4 through the first pipe 14, The liquid storage tank 4 is connected to the inlet of the second heat exchanger 6 with a pipeline, and a first throttling device 5 is arranged between the second heat exchanger 6 and the liquid storage tank 4, and the second The outlet pipe of the heat exchanger 6 is connected to the inlet of the gas-liquid separator 7, the outlet of the gas-liquid separator 7 is connected to the inlet of the compressor 1, and the third heat exchanger 10 includes a connected a The interface and the b interface and the connected c interface and the d interface, the liquid storage tank 4 is connected with the a interface and the c interface through the second pipeline 15 and the third pipeline 16 respectively, and the second pipeline 15 is connected with the The third pipeline 16 is provided with a second throttle device 8 and a third throttle device 9 respectively, the first pipeline 14 is provided with a first reversing valve 3, and the first reversing valve 3 is connected to the fourth Pipe 17, the other end of the fourth pipe 17 is connected to the d interface, the fourth pipe 17 is provided with a third reversing valve 13, and the third reversing valve 13 is connected to the Gas-liquid separator 7, the fourth pipeline 17 is located between the first reversing valve 3 and the third reversing valve 13 and is connected with a sixth pipeline 19, and the other end of the sixth pipeline 19 is connected to the b The sixth pipeline 19 is provided with a second reversing valve 12, the second reversing valve 12 and the fifth pipeline 18 are connected by an eighth pipeline 21, and the first pipeline 14 is located at the A seventh pipe 20 is provided between the first heat exchanger 2 and the first reversing valve 3 , and the other end of the seventh pipe 20 is connected to the fourth pipe 17 located between the first reversing valve 3 and the first reversing valve 3 . Position between six pipes 19.

Based on the triple air-conditioning and hot water supply system based on the above technical features, the present invention controls the flow direction of the refrigerant by setting a plurality of reversing valves and throttling devices respectively, so that the system has simultaneous cooling and heating, independent cooling, independent heating and transitional season operation. Four modes. In summer working conditions, when the demand for cold and heat is large, the cooling and heating mode can be operated at the same time to meet the requirements. When the heat meets the requirements and a large amount of cooling is needed, the system can be switched to separate cooling mode To meet the cooling demand; in winter conditions, when the heat demand is large, the system can be switched to a separate heating mode to meet the requirements; in the transitional season, when a small amount of cooling and more heat are required, the system can be Switching to the transitional season operation mode will dissipate the excess cooling capacity to the outdoor ambient air through the third heat exchanger 10, and the system can adjust the cooling amount dissipated to the outdoor ambient air by changing the heat exchange area of the third heat exchanger 10. It can meet the different cooling demand in the transition season, and at the same time ensure the supply of heat. It does not need any other auxiliary devices, and has the advantages of energy saving and environmental protection, convenient control, simple structure and good stability.

Specifically, the refrigerant exchange paths of the various operation modes of the present invention are as follows:

Simultaneous cooling and heating mode, the first reversing valve 3 is energized, the second reversing valve 12 and the third reversing valve 13 are in the default state, the first throttling device 5 is opened, the second throttling device 8 and The third throttling device 9 is closed, the refrigerant flows out from the compressor 1 and passes through the first heat exchanger 2, and then flows into the liquid storage tank 4 through the first reversing valve in sequence, and then passes through the first throttle in sequence. The device 5 and the second heat exchanger 6 flow into the gas-liquid separator 7 , and finally return to the compressor 1 through the gas-liquid separator 7 .

In the independent cooling mode, the first reversing valve 3 is in the default state, the second reversing valve 12 and the third reversing valve 13 are energized, the first throttling device 5 , the second throttling device 8 and the The third throttling device 9 is opened, and the refrigerant flows out from the compressor 1 through the first heat exchanger 2 and then flows to the seventh pipeline 20 and the fourth pipeline 17 in turn, and then is divided into two paths, one of which is in turn. After passing through the second reversing valve 12, the third heat exchanger 10 and the second throttling device 8, it flows into the liquid storage tank 4; the other refrigerant passes through the third reversing valve 13, the third Heater 10 and third throttling device 9 then flow into the liquid storage tank 4, and then the refrigerant flows out of the liquid storage tank 4 through the first throttling device 5 and the second heat exchanger 6 in sequence, and then flows into the liquid storage tank 4. The gas-liquid separator 7 is finally returned to the compressor 1 through the gas-liquid separator 7 .

In the heating mode alone, the first reversing valve 3, the second reversing valve 12 and the third reversing valve 13 are all energized, the first throttling device 5 is closed, the second throttling device 8 and the third The three throttling devices 9 are opened, the refrigerant flows from the compressor 1 through the first heat exchanger 2, and then flows into the liquid storage tank 4 through the first reversing valve 3, and then is divided into two paths, one for refrigeration The refrigerant passes through the second throttling device 8, the third heat exchanger 10, the second reversing valve 12, and the eighth pipeline in sequence, and then flows into the gas-liquid separator 7; the other refrigerant passes through the third section in sequence. The flow device 9, the third heat exchanger 10, the third reversing valve 13, and finally flows into the gas-liquid separator 7 through the fifth pipeline, and finally the refrigerant returns to the compression through the gas-liquid separator 7 machine 1.

In the transitional season operation mode, the first reversing valve 3 is energized, the second reversing valve 12 and the third reversing valve 13 are in the default state, and the first throttling device 5 and the third throttling device 9 are opened , the second throttling device 8 is closed, the refrigerant flows from the compressor 1 through the first heat exchanger 2, and then flows into the liquid storage tank 4 through the first reversing valve 3 in turn, and then divides into two paths , one channel of refrigerant passes through the first throttling device 5 and the second heat exchanger 6 in sequence and then flows into the gas-liquid separator 7; the other channel of refrigerant sequentially passes through the third throttling device 9 and the third heat exchange device The compressor 10 and the third reversing valve 13 flow into the gas-liquid separator 7 , and finally the refrigerant returns to the compressor 1 through the gas-liquid separator 7 .

In order to increase the stability of the system, in this embodiment, the first pipe 14 is provided with a first check valve 22 between the first reversing valve 3 and the liquid storage tank 4 , and the fifth pipe 18 is located between the first reversing valve 3 and the liquid storage tank 4 . A second one-way valve 23 is arranged between the gas-liquid separator 7 and the eighth pipeline 21. By setting the first one-way valve 22 and the second one-way valve 23, the backflow of the refrigerant is avoided, and the system stability.

In this embodiment, a fan 11 is provided facing the third heat exchanger 10 . Since the third heat exchanger 10 has a parallel dual-path structure (ie ab channel and cd channel), the change of the heat transfer area and the refrigerant flow rate of the outdoor heat exchanger can be realized. The change of the air volume of the fan 11 can better adapt to the unbalanced demand for cold and heat in the transition season.

In this embodiment, the first reversing valve 3 , the second reversing valve 12 and the third reversing valve 13 are all three-way reversing valves, which can realize the function of controlling the flow direction of the refrigerant.

In this embodiment, the liquid storage tank 4 is a four-port liquid storage tank, the first pipeline 14 , the second pipeline 15 , the third pipeline 16 , the liquid storage tank 4 and the second heat exchanger 6 The pipes between are respectively connected to different interfaces of the liquid storage tank 4 . The liquid storage tank 4 not only plays the role of storing liquid refrigerant, but also plays the role of distributing the refrigerant.

In this embodiment, the first throttling device 5 , the second throttling device 8 and the third throttling device 9 are electronic expansion valves or thermal expansion valves or capillary tubes. Preferably, the first throttling device 5 , the second throttling device 8 and the third throttling device 9 use electronic expansion valves, which can not only play the role of throttling, but also control the flow direction of the refrigerant.

In this embodiment, the first heat exchanger 2 and the second heat exchanger 6 are both jacketed water-refrigerant heat exchangers, and the third heat exchanger 10 is a fin with more than two branches Plate air-refrigerant heat exchanger. Preferably, the third heat exchanger 10 is a finned air-refrigerant heat exchanger with two branches, and the second reversing valve 12 and the third reversing valve 13 are respectively used for independent operation. control, the two paths do not affect each other, thereby increasing the convenience of defrosting. When the third heat exchanger 10 is frosted under the condition of poor environment, part of the high temperature and high pressure can be refrigerated through the grading control program. The agent passes through one of the branches to achieve the effect of hot gas defrosting, and the operation effect of the other branch is not affected.

In this embodiment, the first heat exchanger 2 is always used as a condenser during operation, the second heat exchanger 6 is always used as an evaporator, and the third heat exchanger 10 is used as a separate cooling mode. Condenser; acts as evaporator in single heating mode.

The above are only the preferred embodiments of the present invention. It should be pointed out that for those skilled in the art, without departing from the technical principle of the present invention, several improvements and replacements can be made. These improvements and replacements It should also be regarded as the protection scope of the present invention.

Claims (7)

1. A triple air-conditioning hot water system, characterized in that: comprising a compressor, a first heat exchanger, a liquid storage tank, a second heat exchanger, a gas-liquid separator and a third heat exchanger, the compressor The outlet of the first heat exchanger is connected to the inlet of the first heat exchanger, the outlet of the first heat exchanger is connected to the inlet of the liquid storage tank through a first pipeline, and the liquid storage tank pipeline is connected to the second heat exchanger. Inlet, and a first throttling device is arranged between the second heat exchanger and the liquid storage tank, the outlet pipe of the second heat exchanger is connected to the inlet of the gas-liquid separator, and the gas-liquid separator The outlet of the separator is connected to the inlet of the compressor, the third heat exchanger includes a connected interface a and a b interface and a connected c interface and a d interface, and the liquid storage tank passes through the second pipeline and The third pipeline is connected to the a interface and the c interface, and the second pipeline and the third pipeline are respectively provided with a second throttling device and a third throttling device, and the first pipeline is provided with a third throttling device. A reversing valve, the first reversing valve is connected to the fourth pipeline, the other end of the fourth pipeline is connected to the d interface, the fourth pipeline is provided with a third reversing valve, the third reversing valve The direction valve is connected to the gas-liquid separator through a fifth pipeline, the fourth pipeline is located between the first reversing valve and the third reversing valve and is connected with a sixth pipeline, and the other end of the sixth pipeline is connected The b interface, the sixth pipeline is provided with a second reversing valve, the second reversing valve and the fifth pipeline are connected through an eighth pipeline, and the first pipeline is located in the first pipeline. A seventh pipeline is arranged between the heat exchanger and the first reversing valve, and the other end of the seventh pipeline is connected to the position of the fourth pipeline located between the first reversing valve and the sixth pipeline. 2 . The air conditioning and hot water system according to claim 1 , wherein the first pipeline is provided with a first check valve between the first reversing valve and the liquid storage tank. 3 . 3 . The air conditioning and hot water system of claim 1 , wherein the fifth pipeline is provided with a second check valve between the gas-liquid separator and the eighth pipeline. 4 . 4 . The air conditioning and hot water supply system of claim 1 , wherein the first reversing valve, the second reversing valve and the third reversing valve are all three-way reversing valves. 5 . 5 . The triple air-conditioning and hot water system according to claim 1 , wherein the liquid storage tank is a four-port liquid storage tank, the first pipeline, the second pipeline, the third pipeline and the liquid storage tank. 6 . The pipes between the tank and the second heat exchanger are respectively connected to different interfaces of the liquid storage tank. 6 . The air conditioning and hot water system according to claim 1 , wherein the first throttling device, the second throttling device and the third throttling device are electronic expansion valves, thermal expansion valves or capillary tubes. 7 . 7 . The air-conditioning and hot water system of claim 1 , wherein the first heat exchanger and the second heat exchanger are both jacketed water-refrigerant heat exchangers, and the third heat exchanger The heat exchanger is a finned air-refrigerant heat exchanger with more than two branches.

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