CN104236155B - Have that coolant is supercool, the defrosting air conditioning system of heat-production functions and control method thereof - Google Patents

Abstract

The invention discloses an air-conditioning system with functions of refrigerant supercooling, defrosting and heating, and a control method thereof, including an outdoor unit and an indoor unit, the indoor unit includes at least one indoor unit, the outdoor unit includes a compressor, an outdoor replacement Heater, outdoor throttling device and four-way valve, the indoor unit includes an indoor heat exchanger and an indoor throttling device, the air conditioning system also includes a heat exchange device; the heat exchange device is provided with a first coil and The second coil; both ends of the first coil communicate with the outdoor throttling device and the indoor throttling device respectively; one end of the second coil communicates with the outdoor throttling device, and the other end communicates with the air intake of the compressor end connection. The air-conditioning system uses one device to realize the secondary subcooling of the refrigerant at the same time, and realizes the heat supply to the indoor unit while defrosting during the defrosting process; the air-conditioning system is also provided with a module connected to the compressor driving module Heat exchanger for energy recovery while cooling the compressor drive module.

Description

Air-conditioning system with refrigerant supercooling, defrosting and heating functions and its control method

technical field

The invention relates to the technical field of air-conditioning refrigerant supercooling, defrosting and heating, in particular to an air-conditioning system with the functions of refrigerant supercooling, defrosting and heating and a control method thereof.

Background technique

When the air conditioner is cooling, when the outdoor temperature is too high, the refrigerant coming out of the outdoor heat exchanger is insufficient in subcooling, and the refrigerant in the liquid pipe will flash, resulting in poor cooling effect; when the air conditioner is heating, when When the outdoor temperature is too low, frosting occurs on the outdoor heat exchanger. The traditional air conditioner defrosting operation uses a four-way valve to switch to a refrigeration refrigerant circuit. It will absorb the heat in the room, causing large fluctuations in the room temperature and reducing the comfort of use.

In order to solve the problem of refrigerant flashing during refrigeration, the usual method in the industry is to add a subcooler at the outlet of the condenser to perform secondary subcooling on the refrigerant.

In order to solve the problem of indoor temperature drop caused by defrosting, a heat accumulator is designed on the air conditioning system. The heat accumulator can store heat through auxiliary electric heating or high-temperature refrigerant on the side of the compressor when the indoor mechanism is heating. When defrosting, the heat is taken out from the accumulator for defrosting.

In the existing technology, there are few air-conditioning systems with two functions at the same time. Even if the air-conditioning system needs to have the secondary sub-cooling function and the defrosting function at the same time, it is necessary to add a sub-cooling device and a defrosting function to the existing air-conditioning system. The heat accumulator will complicate the structure of the air-conditioning system, increase the volume, and increase the production cost. Moreover, the existing air conditioning system cannot supply heat to the room during defrosting. The best solution is to require the air conditioner to have the function of secondary subcooling of the refrigerant, heat storage and the function of heating the room while defrosting. However, the existing air conditioner The system not only has complex system design and control, high cost, but also has the problem that the indoor unit cannot heat during heat storage and defrosting, thereby reducing user satisfaction.

Contents of the invention

The object of the present invention is to provide an air-conditioning system and its control method with the functions of refrigerant supercooling, defrosting and heating, which can realize the secondary supercooling of the refrigerant, and can realize the heating of the indoor unit while defrosting, Moreover, the air-conditioning system has a simple structure, is convenient to manufacture, and improves user comfort.

For reaching this purpose, the present invention adopts following technical scheme:

An air conditioning system with refrigerant subcooling, defrosting and heating functions, comprising an outdoor unit and an indoor unit, the indoor unit includes at least one indoor unit, the outdoor unit includes a compressor, an outdoor heat exchanger, an outdoor throttling device and a four-way valve, the indoor unit includes an indoor heat exchanger and an indoor throttling device, wherein the air conditioning system also includes a heat exchange device;

The heat exchange device is provided with a first coil and a second coil;

The two ends of the first coil are respectively communicated with the outdoor throttling device and the indoor throttling device;

One end of the second coil pipe communicates with the outdoor throttling device, and the other end communicates with the intake end of the compressor.

As a preferred solution of the above-mentioned air-conditioning system with functions of refrigerant supercooling, defrosting and heating, a coil throttling device is provided at the inflow end of the refrigerant when the second coil is cooling.

As a preferred solution of the above-mentioned air-conditioning system with refrigerant subcooling, defrosting and heating functions, the first coil and the second coil are intersected and arranged in a closed casing.

As a preferred solution of the air-conditioning system with the functions of refrigerant supercooling, defrosting and heating, the housing is filled with phase change heat storage materials.

As a preferred solution of the above-mentioned air-conditioning system with refrigerant supercooling, defrosting and heating functions, the air-conditioning system further includes a module heat exchanger, and the module heat exchanger is connected to the compressor driving module.

As a preferred solution for the above-mentioned air-conditioning system with refrigerant subcooling, defrosting and heating functions, the four-way valve includes a D port, a C port, an S port and an E port, and the D port of the four-way valve is connected to the compressor The air outlet of the four-way valve is connected with the air outlet, the C port of the four-way valve is connected with the outdoor heat exchanger, the S port of the four-way valve is connected with the air inlet of the compressor, and the second coil is connected with the four-way valve Port E is connected, and the second coil is connected with the air inlet of the compressor through the reversing of the four-way valve.

As a preferred solution of the above-mentioned air-conditioning system with refrigerant supercooling, defrosting and heating functions, the air-conditioning system further includes a second four-way valve, and the second four-way valve includes D port, C port, S port and Port E, port D of the second four-way valve communicates with the air outlet of the compressor, port C of the second four-way valve communicates with port S of the second four-way valve through a capillary tube, and the second The S port of the four-way valve communicates with the intake end of the compressor, the E port of the second four-way valve communicates with the indoor heat exchanger, and the capillary is a flow-limiting capillary.

As a preferred solution for the above-mentioned air-conditioning system with refrigerant supercooling, defrosting and heating functions, the module heat exchanger is arranged in the heat exchange device, or the module heat exchanger is arranged in the outdoor throttling device and heat exchange on the piping between the devices.

A control method for an air-conditioning system with refrigerant supercooling, defrosting and heating functions as described above, which includes the following steps:

Step A: Turn on the air conditioning system. If the air conditioner is running cooling, go to step B, if it’s heating, go to step C, and if it’s defrosting and heating, go to step D;

Step B: The control device of the air conditioning system controls the communication state of the four-way valve and the second four-way valve port, so that the refrigerant from the compressor flows through the outdoor heat exchanger and the outdoor throttling device in sequence after passing through the four-way valve. Part of the refrigerant in the outdoor throttling device flows into the indoor unit through the first coil, and finally returns to the compressor through the second four-way valve; The through valve returns to the compressor to complete a refrigeration cycle;

Step C: The control device of the air conditioning system controls the communication state of the four-way valve and the second four-way valve port, so that part of the refrigerant coming out of the compressor enters the second coil through the four-way valve; the other part of the refrigerant passes through the second four-way valve Enter the indoor unit; the refrigerant from the second coil and the indoor unit mixes and enters the first coil, and the refrigerant from the first coil enters the outdoor heat exchanger through the outdoor throttling device, and finally returns to the outdoor heat exchanger through the four-way valve. Compressor to complete a heating cycle;

Step D: The control device of the air-conditioning system controls the communication state of the four-way valve and the valve port of the second four-way valve, so that part of the refrigerant coming out of the compressor enters the outdoor heat exchanger through the four-way valve, and the other part of the refrigerant passes through the second four-way valve. The refrigerant from the outdoor heat exchanger enters the first coil after passing through the outdoor throttling device, flows through the first coil, joins the refrigerant flowing out of the indoor unit, and then enters the second coil through the throttling device. coil, and finally return to the compressor through the four-way valve to complete a heating and defrosting cycle.

As a preferred solution of the control method of the air-conditioning system with the functions of refrigerant supercooling, defrosting and heating,

In step B, the control system controls the C port, D port, S port, and E port of the four-way valve to be connected, and controls the C port, D port, and S port and E port of the second four-way valve to be connected;

In step C, the control system controls the D port, E port, C port, and S port of the four-way valve to be connected, and controls the D port, E port, C port, and S port of the second four-way valve to be connected;

In step D, the control system controls the D port, C port, E port, and S port of the four-way valve to be connected, and controls the D port, E port, C port, and S port of the second four-way valve to be connected.

The beneficial effects of the present invention are: the present invention provides an air-conditioning system with functions of refrigerant supercooling, defrosting and heating and its control method, which adds a heat exchange device, and passes through the first coil in the heat exchange device, The heat exchange between the second coil and the heat storage material realizes the secondary subcooling of the refrigerant in the cooling process, and realizes parallel heat storage and series waste heat recovery in the heating process; Secondary subcooling, and in the process of defrosting, the indoor unit is heated while defrosting; at the same time, the application is also equipped with a module heat exchanger connected to the compressor driving module, which drives the compressor Energy recovery takes place while the modules are cooling.

Description of drawings

Fig. 1 is a schematic structural view of an air conditioning system with refrigerant supercooling and defrosting and heating functions provided by Embodiment 1 of the present invention;

in:

1: Outdoor unit; 2: Indoor unit; 3: Heat exchange device; 4: Module heat exchanger;

11: compressor; 12: outdoor heat exchanger; 13: outdoor throttling device; 14: four-way valve; 15: second four-way valve;

21: indoor heat exchanger; 22: indoor throttling device;

31: first coil; 32: second coil; 33: coil throttling device.

detailed description

The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and through specific implementation methods.

As shown in Figure 1, this embodiment provides an air conditioning system with the functions of refrigerant supercooling and defrosting and heating. It has the function of refrigerant secondary When the outdoor unit is frosted, it has the function of heating the room while defrosting.

The above-mentioned air conditioning system specifically includes an outdoor unit 1 and an indoor unit, wherein the indoor unit includes at least one indoor unit 2, and the outdoor unit 1 includes a compressor 11, an outdoor heat exchanger 12, an outdoor throttling device 13 and a four-way valve 14, of course The outdoor unit 1 also includes commonly used devices such as an oil separator and a gas-liquid separator, which will not be described one by one here. The indoor unit 2 includes an indoor heat exchanger 21 and an indoor throttling device 22 . The components of the above-mentioned air-conditioning system are all installed according to the layout and installation methods of common air-conditioning systems.

The above-mentioned air conditioning system also includes a heat exchange device 3, and the heat exchange device 3 is provided with a first coil 31 and a second coil 32, wherein the two ends of the first coil 31 are connected with the outdoor throttling device 13 and the indoor throttling device respectively. The device 22 communicates, one end of the second coil 32 communicates with the outdoor throttling device 13 , and the other end communicates with the intake end of the compressor 11 . During the cooling process of the air conditioner, the refrigerant flowing through the second coil 32 evaporates and absorbs heat, and performs secondary subcooling on the refrigerant in the first coil 31. In order to facilitate the evaporation of the refrigerant in the second coil 32, The refrigerant inflow end of the second coil 32 is provided with a coil throttling device 33 .

In this embodiment, in order to improve the heat exchange efficiency between the first coil pipe 31 and the second coil pipe 32, the heat exchange device further includes a housing, and the first coil pipe 31 and the second coil pipe 32 are intersected at The closed casing is filled with phase change heat storage material, thereby improving the heat exchange efficiency between the first coil 31 and the second coil 32 .

The air conditioning system provided in this embodiment also includes a modular heat exchanger 4, which is arranged on the pipeline between the outdoor throttling device 13 and the heat exchange device 3, and it can also be arranged in the heat exchange device 3, What is shown in FIG. 1 is the situation in which the modular heat exchanger is arranged on the pipeline between the outdoor throttling device 13 and the heat exchange device 3 , and the situation in which it is arranged in the heat exchange device 3 is not shown. The module heat exchanger 4 is connected to the compressor drive module, and can exchange heat with the refrigerant in the pipeline between the heat exchange device 3 or the outdoor throttling device 13 and the heat exchange device 3, and the compressor drive module Allow to cool.

The above-mentioned four-way valve 14 includes D port, C port, S port and E port, the D port of the four-way valve 14 is connected to the air outlet of the compressor 11, the C port of the four-way valve 14 is connected to the outdoor heat exchanger 22, and the four-way The S port of the valve 14 communicates with the intake port of the compressor 11, the second coil 32 communicates with the E port of the four-way valve 14, and the second coil 32 communicates with the compressor 11 through the reversing of the four-way valve 14. The air intake is connected.

The air conditioning system also includes a second four-way valve 15. The second four-way valve 15 includes a D port, a C port, an S port, and an E port. The D port of the second four-way valve 15 communicates with the air outlet of the compressor 11. The C port of the second four-way valve 15 communicates with the S port of the second four-way valve 15 through a capillary tube, the S port of the second four-way valve 15 communicates with the intake port of the compressor 11, and the E port of the second four-way valve 15 It communicates with the indoor heat exchanger 21. Wherein, the capillary is a flow-limiting capillary, that is, when the port C of the second four-way valve 15 communicates with the port S of the second four-way valve 15, basically no refrigerant passes between them.

The present application also provides a control method for the above-mentioned air-conditioning system, which specifically includes the following steps:

Step A: Turn on the air conditioning system. If the air conditioner is running cooling, go to step B, if it’s heating, go to step C, and if it’s defrosting and heating, go to step D;

Step B: The control device of the air conditioning system controls the communication state of the four-way valve and the second four-way valve port, so that the refrigerant from the compressor flows through the outdoor heat exchanger and the outdoor throttling device in sequence after passing through the four-way valve. Part of the refrigerant in the outdoor throttling device flows into the indoor unit through the first coil, and finally returns to the compressor through the second four-way valve; The through valve returns to the compressor to complete a refrigeration cycle;

Step C: The control device of the air conditioning system controls the communication state of the four-way valve and the second four-way valve port, so that part of the refrigerant coming out of the compressor enters the second coil through the four-way valve; the other part of the refrigerant passes through the second four-way valve Enter the indoor unit; the refrigerant from the second coil and the indoor unit mixes and enters the first coil, and the refrigerant from the first coil enters the outdoor heat exchanger through the outdoor throttling device, and finally returns to the outdoor heat exchanger through the four-way valve. Compressor to complete a heating cycle;

Step D: The control device of the air-conditioning system controls the communication state of the four-way valve and the valve port of the second four-way valve, so that part of the refrigerant coming out of the compressor enters the outdoor heat exchanger through the four-way valve, and the other part of the refrigerant passes through the second four-way valve. The refrigerant from the outdoor heat exchanger enters the first coil after passing through the outdoor throttling device, flows through the first coil, joins the refrigerant flowing out of the indoor unit, and then enters the second coil through the throttling device. coil, and finally return to the compressor through the four-way valve to complete a heating and defrosting cycle.

preferred,

In step B, the control system controls the C port, D port, S port, and E port of the four-way valve to be connected, and controls the C port, D port, and S port and E port of the second four-way valve to be connected;

In step C, the control system controls the D port, E port, C port, and S port of the four-way valve to be connected, and controls the D port, E port, C port, and S port of the second four-way valve to be connected;

In step D, the control system controls the D port, C port, E port, and S port of the four-way valve to be connected, and controls the D port, E port, C port, and S port of the second four-way valve to be connected.

In order to further illustrate the above-mentioned air-conditioning system, the working principle of the above-mentioned air-conditioning system will be described below with reference to the flow direction of the refrigerant in the heating and cooling, heating, and defrosting heating processes of the air-conditioning system.

Cooling operation:

During the cooling process, ports C, D, S, and E of the four-way valve 14 are connected; ports C, D, S, and E of the second four-way valve 15 are connected.

During this process, the flow direction of the refrigerant is as follows: the high-temperature and high-pressure gas from the compressor 11 flows through the C port and the D port of the four-way valve 14 through the outdoor heat exchanger 12, the outdoor throttling device 13, and the module heat exchanger 4 in sequence. When the refrigerant passes through the module heat exchanger 4, it exchanges heat with the compressor driving module, and enters the first coil 31 of the heat exchange device 3 after cooling the compressor driving module, and part of the refrigerant flowing out of the first coil 31 passes through the coil The throttling device 33 enters the second coil 32, and the other part enters the indoor unit. The refrigerant entering the second coil 32 is throttled and depressurized by the coil throttling device 33, and then evaporates and absorbs heat in the second coil 32. At the same time, heat exchange with the first coil 31 realizes secondary subcooling of the refrigerant in the first coil 31 , and the refrigerant entering the second coil 32 finally enters the four-way valve 14 and returns to the compressor 11 . The refrigerant entering the indoor unit evaporates in the indoor heat exchanger 21 and returns to the compressor 11 through the second four-way valve 15 to complete a refrigeration cycle.

Heating operation:

During the heating process, the D port, E port, C port, and S port of the four-way valve 14 are connected, and the D port, E port, C port, and S port of the second four-way valve 15 are connected.

During this process, the flow direction of the refrigerant is: part of the high-temperature and high-pressure gas coming out of the compressor 11 passes through the four-way valve 14 and enters the second coil 32 of the heat exchange device 3 to condense and release heat, and the released heat is absorbed by the heat exchange device 3 The phase change heat storage material is absorbed and stored; the other part of the refrigerant enters the indoor unit 2 through the second four-way valve 15 to condense and exchange heat; After the refrigerant is combined, it enters the heat exchange device 3 through the first coil 31 again to realize the recovery of waste heat. After passing through the module heat exchanger 4, the refrigerant coming out of the first coil 31 passes through the outdoor throttling device 13 to throttle and reduce pressure. Enter the outdoor heat exchanger 12 to evaporate and absorb heat, and finally return to the compressor 11 after passing through the four-way valve 14.

In this process, the temperature of the compressor driving module is cooled by the module heat exchanger 4, and at the same time, the parallel heat storage of the heat exchange device and the series waste heat recovery are used to realize the heat storage of the heat exchange device while supplying heat to the indoor unit.

Defrost heating operation:

During this process, the D port, C port, E port and S port of the four-way valve 14 are connected, and the D port, E port, C port and S port of the second four-way valve 15 are connected;

During this process, the flow direction of the refrigerant is as follows: part of the high-temperature and high-pressure gas coming out of the compressor 11 passes through the four-way valve 11 and enters the outdoor heat exchanger 12 to condense and release heat, and the heat is released for defrosting, and the other part of the refrigerant passes through the second four-way The valve 15 enters the indoor unit 2 for heating; the refrigerant coming out of the outdoor heat exchanger 12 passes through the outdoor throttling device 13 and the module heat exchanger 4, and then comes out from the first coil 31 of the heat exchange device 3 and comes back from the indoor After converging, the refrigerant enters the heat exchange device 3 to absorb heat through the coil throttling device 33 , and finally returns to the compressor 11 after passing through the four-way valve 14 again.

In this process, the heat stored in the accumulator is released from the accumulator for defrosting of the outdoor unit and heating of the indoor unit, which improves the comfort.

The above describes the technical principles of the present invention in conjunction with specific embodiments. These descriptions are only for explaining the principles of the present invention, and cannot be construed as limiting the protection scope of the present invention in any way. Based on the explanations herein, those skilled in the art can think of other specific implementation modes of the present invention without creative efforts, and these modes will all fall within the protection scope of the present invention.

Claims (9)

1. have coolant supercool, defrosting heat-production functions an air conditioning system, including off-premises station (1) and room Interior unit, described indoor units includes that at least one indoor set (2), described off-premises station (1) include compressor (11), outdoor heat exchanger (12), outdoor throttling arrangement (13) and cross valve (14), described indoor set (2) Including indoor heat exchanger (21) and indoor throttling arrangement (22), it is characterised in that described air conditioning system is also wrapped Include heat-exchange device (3)；

The first coil pipe (31) and the second coil pipe (32) it is provided with in described heat-exchange device (3)；

The two ends of described first coil pipe (31) respectively with outdoor throttling arrangement (13), indoor throttling arrangement (22) Connection；

One end of described second coil pipe (32) connects with outdoor throttling arrangement (13), and its other end is with described The inlet end connection of compressor (11)；

Described cross valve (14) includes D mouth, C mouth, S mouth and E mouth, the D mouth of described cross valve (14) Connecting with the gas outlet of compressor, C mouth connects with outdoor heat exchanger (12), S mouth and compressor (11) Air inlet connects, and described second coil pipe (32) is connected with E mouth, and made by the commutation of cross valve (14) Second coil pipe (32) connects with the air inlet of compressor (11).

The most according to claim 1 have that coolant is supercool, the air conditioning system of defrosting heat-production functions, and it is special Levying and be, during described second coil pipe (32) refrigeration, the inflow end of coolant is provided with coil pipe throttling arrangement (33).

The most according to claim 1 have that coolant is supercool and the air conditioning system of defrosting heat-production functions, and it is special Levying and be, described first coil pipe (31) and the second coil pipe (32) are arranged in a crossed manner in the housing closed.

The most according to claim 3 have that coolant is supercool, the air conditioning system of defrosting heat-production functions, and it is special Levy and be, in described housing, be filled with phase change heat storage material.

The most according to claim 1 have that coolant is supercool, the air conditioning system of defrosting heat-production functions, and it is special Levying and be, described air conditioning system also includes module heat exchanger (4), described module heat exchanger (4) and compressor Driving module is connected.

The most according to claim 1 have that coolant is supercool, the air conditioning system of defrosting heat-production functions, and it is special Levying and be, described air conditioning system also includes that the second cross valve (15), described second cross valve (15) include D Mouth, C mouth, S mouth and E mouth, the D mouth of described second cross valve (15) and the gas outlet of compressor (11) Connection, C mouth is connected by capillary tube with S mouth, and S mouth connects with the inlet end of compressor (11), E mouth and Indoor heat exchanger (21) connects, and described capillary tube is current limliting capillary tube.

The most according to claim 5 have that coolant is supercool, the air conditioning system of defrosting heat-production functions, and it is special Levying and be, described module heat exchanger (4) is arranged in heat-exchange device (3), or described module heat exchange Device (4) is disposed in the outdoor on the pipeline between throttling arrangement (13) and heat-exchange device (3).

8. as claim 6 has, coolant is supercool, a control method for the air conditioning system of the heat-production functions that defrosts, It is characterized in that, comprise the following steps:

Step A: open air conditioning system, if operation of air conditioner cooling operation enter step B, run heat operate into Enter step C, run defrosting and heat operating entrance step D；

Step B: the device that controls of air conditioning system controls cross valve, the connected state of the second cross valve valve port, Make after cross valve, to flow through outdoor heat exchanger, outdoor throttling arrangement, warp successively from compressor coolant out The coolant part crossing outdoor throttling arrangement flows into indoor set through the first coil pipe, returns finally by the second cross valve Returning compressor, another part flows through the second coil pipe, finally by four-way after coil pipe throttling arrangement reducing pressure by regulating flow Valve returns compressor, completes a kind of refrigeration cycle；

Step C: the device that controls of air conditioning system controls cross valve, the connected state of the second cross valve valve port, Make to enter the second coil pipe from a compressor out coolant part through cross valve；Another part coolant is through second Cross valve enters indoor set；The first coil pipe is entered after the second coil pipe and indoor set coolant mixing out, from First coil pipe coolant out by outdoor throttling arrangement laggard enter outdoor heat exchanger, return finally by cross valve To compressor, complete once to heat circulation；

Step D: the device that controls of air conditioning system controls cross valve, the connected state of the second cross valve valve port, Make from compressor out coolant a part through cross valve enter outdoor heat exchanger, another part coolant warp Cross the second cross valve and enter indoor set；After outdoor throttling arrangement, the is entered from outdoor heat exchanger coolant out One coil pipe, through coil pipe throttling arrangement enters the after converging with the coolant flowed out from indoor set after flowing through the first coil pipe Two coil pipes, return to compressor finally by cross valve, complete a heating and defrosting circulation.

The most according to claim 8 have that coolant is supercool, the control of air conditioning system of defrosting heat-production functions Method, it is characterised in that

In stepb, control system controls the C mouth of cross valve and connects with D mouth, and S mouth connects with E mouth, The C mouth controlling the second cross valve connects with D mouth, and S mouth connects with E mouth；

In step C, control system controls the D mouth of cross valve and connects with E mouth, and C mouth connects with S mouth, The D mouth controlling the second cross valve connects with E mouth, and C mouth connects with S mouth；

In step D, control system controls the D mouth of cross valve and connects with C mouth, and E mouth connects with S mouth, The D mouth controlling the second cross valve connects with E mouth, and C mouth connects with S mouth.