WO2021218350A1

WO2021218350A1 - Air conditioning system control method and air conditioning system

Info

Publication number: WO2021218350A1
Application number: PCT/CN2021/078566
Authority: WO
Inventors: 罗建文; 毛守博; 卢大海; 何建奇
Original assignee: 青岛海尔空调电子有限公司; 海尔智家股份有限公司
Priority date: 2020-04-30
Filing date: 2021-03-02
Publication date: 2021-11-04
Also published as: CN113669843A

Abstract

The present invention relates to the field of air conditioning. The present invention aims to solve the problem of poor heating effect of indoor units during defrosting of outdoor heat exchangers of air conditioning units. For this purpose, in the present invention, a compressor suction port of an air conditioning system is connected to a first reversing device and a second reversing device; two ends of an air pipe are respectively connected to the second reversing device and an indoor unit; a first heat exchanger group has one end connected to the first reversing device and the other end connected to the indoor unit by means of a liquid pipe; a second heat exchanger group has one end connected to the first reversing device and the other end connected to the indoor unit by means of a liquid pipe; and a first throttling device is used for adjusting the amount of refrigerant flowing into the first reversing device. An air conditioning system control method comprises: determining a working mode of an air conditioning system, and when the working mode is a first heat exchanger group defrosting mode or a second heat exchanger group defrosting mode, adjusting the opening degree of a first throttling device according to a preset condition. In this way, when the first heat exchanger group or the second heat exchanger group performs defrosting, the heating effect of the indoor unit can be guaranteed.

Description

Control method of air-conditioning system and air-conditioning system

Technical field

The invention relates to the technical field of air conditioning, in particular to a control method for an air conditioning system and an air conditioning system.

Background technique

When the existing air conditioning unit is in defrosting operation, it is generally switched to the cooling operation mode through the four-way valve reversal, the indoor heat exchanger is used as the evaporator, the outdoor heat exchanger is used as the condenser, and the heat dissipated by the condenser is condensed Melt the frost layer. Therefore, during the defrosting period, since the indoor heat exchanger is an evaporator, it will cause the indoor ambient temperature to drop, which will give users an uncomfortable experience.

In order to solve the above technical problems, in the prior art, multiple outdoor heat exchangers are usually set on the basis of ordinary multi-line, and a high temperature pipe is led out from the exhaust port of the compressor and connected to the outer side of the condenser through an electric control valve. If defrosting is required during heating operation, one heat exchanger in the outdoor unit can continue to be used as an evaporator according to the heating mode while the heating mode remains unchanged, and the other heat exchanger Defrost as a condenser.

However, because the condenser is a high-pressure liquid, the flow rate of the refrigerant flowing through the defrosting refrigerant is relatively large, and the refrigerant that naturally continues to flow through the indoor heat exchanger for heating will be relatively small, which affects the indoor unit during the defrosting process. The heating effect.

Correspondingly, a new control method for air conditioning systems is needed in the art to solve the above-mentioned problems.

Summary of the invention

In order to solve the above-mentioned problems in the prior art, that is, to solve the problem of poor heating effect of the indoor unit when the outdoor heat exchanger is defrosted in the existing air-conditioning unit, the present invention provides a control method of an air-conditioning system. The air conditioning system includes a compressor, a first reversing device, a second reversing device, a first heat exchanger group, a second heat exchanger group, a gas pipe, a liquid pipe, an indoor unit, and a first throttling device; the compressor The exhaust port of the compressor is in communication with the first reversing device and the second reversing device at the same time, and the suction port of the compressor is in communication with the first reversing device and the second reversing device at the same time; Both ends of the air pipe are respectively connected to the second reversing device and the indoor unit; one end of the first heat exchanger group is connected to the first reversing device, and the other end is connected to the liquid pipe The indoor unit is in communication; one end of the second heat exchanger group is in communication with the first reversing device, and the other end is in communication with the indoor unit through the liquid pipe; the first throttling device is provided in the Between the first reversing device and the exhaust port, and used to adjust the flow of refrigerant flowing into the first reversing device; the first reversing device and the second reversing device are configured as: When the first heat exchanger group is defrosted, the air pipe and the first heat exchanger group are in communication with the exhaust port, and the second heat exchanger group is in communication with the suction port; When the second heat exchanger group is defrosted, the air pipe and the second heat exchanger group are in communication with the exhaust port, and the first heat exchanger group is in communication with the suction port; The first heat exchanger group and the second heat exchanger group are in communication with the exhaust port, and the air pipe is in communication with the suction port; during heating, the first heat exchanger group and the The second heat exchanger group is in communication with the intake port, and the air pipe is in communication with the exhaust port; the control method includes: determining a working mode of the air conditioning system, wherein the working mode includes a cooling mode, Heating mode, first heat exchanger group defrosting mode, second heat exchanger group defrosting mode; when the working mode is the first heat exchanger group defrosting mode or the second heat exchanger group defrosting mode In the defrosting mode, the opening degree of the first throttle device is adjusted according to a preset condition.

In the preferred technical solution of the above control method, the air-conditioning system further includes a first pressure sensor, and the first pressure sensor is arranged between the first throttling device and the first reversing device. Adjusting the first throttling device under preset conditions specifically includes: determining a target condensing pressure; determining and acquiring the real-time pressure of the refrigerant flowing into the first reversing device; comparing the condensing pressure with the real-time pressure, and The opening degree of the first throttle device is adjusted according to the comparison result.

In the preferred technical solution of the above control method, the air conditioning system further includes a second pressure sensor provided at the exhaust port, the second pressure sensor is used to detect the refrigerant pressure at the exhaust port, and Determining the target condensation pressure specifically includes: determining and acquiring the exhaust pressure at the exhaust port; and determining the target condensation pressure according to the exhaust pressure.

In the preferred technical solution of the above control method, the adjusting the opening degree of the first throttling device according to the comparison result specifically includes: when the real-time pressure is less than the condensing pressure, increasing the first The opening degree of the throttling device; otherwise, it is determined whether the real-time pressure is greater than the condensing pressure; when the real-time pressure is greater than the condensing pressure, the opening degree of the first throttling device is reduced, otherwise the opening degree of the first throttling device is kept The opening of the first throttle device remains unchanged.

In the preferred technical solution of the above control method, the air conditioning system further includes a second throttling device, a third throttling device, and a fourth throttling device; the second throttling device is provided in the first heat exchanger Between the group and the liquid pipe; the third throttling device is arranged between the second heat exchanger group and the liquid pipe; one end of the fourth throttling device is connected to the first heat Between the exchanger group and the second throttling device, and the other end is connected between the second heat exchanger group and the third throttling device; the control method further includes: when the working mode is In the defrosting mode of the first heat exchanger group, the second throttling device is turned off and the fourth throttling device is turned on; when the working mode is the defrosting mode of the second heat exchanger group, the second throttling device is turned off. Three throttling devices, open the fourth throttling device; when the working mode is the cooling mode or the heating mode, turn off the fourth throttling device, turn on the second throttling device and the third throttling device Throttling device.

The present invention also provides an air conditioning system. The air conditioning system includes: a compressor, a first reversing device, a second reversing device, a first heat exchanger group, a second heat exchanger group, gas pipe, liquid pipe, indoor The compressor, the first throttling device and the controller; the exhaust port of the compressor is in communication with the first reversing device and the second reversing device at the same time, and the suction port of the compressor is simultaneously connected with the The first reversing device and the second reversing device are in communication; the two ends of the air pipe are respectively connected to the second reversing device and the indoor unit; one end of the first heat exchanger is connected to the The first reversing device is connected, and the other end is connected to the indoor unit through the used liquid pipe; one end of the second heat exchanger group is connected to the first reversing device, and the other end is connected through the liquid pipe Communicating with the indoor unit; the first throttling device is provided between the first reversing device and the exhaust port, and is used to adjust the flow of refrigerant flowing into the first reversing device; the The first reversing device and the second reversing device are configured such that when the first heat exchanger group is defrosted, the first heat exchanger group is in communication with the exhaust port, and the second heat The exchanger group is in communication with the suction port; when the second heat exchanger group is defrosted, the second heat exchanger group is in communication with the exhaust port, and the first heat exchanger group is in communication with the exhaust port. The suction port is connected; when cooling, the first heat exchanger group and the second heat exchanger group are connected with the exhaust port, and the air pipe is connected with the suction port; when heating, the The first heat exchanger group and the second heat exchanger group are in communication with the suction port, and the air pipe is in communication with the exhaust port; the controller is in communication connection with the first throttling device.

In the preferred technical solution of the above-mentioned air-conditioning system, the air-conditioning system further includes: a first pressure sensor, arranged between the first throttling device and the first reversing device, the first pressure sensor and the control器communication connection.

In the preferred technical solution of the above-mentioned air-conditioning system, the air-conditioning system further includes: a second pressure sensor provided at the exhaust port, the second pressure sensor is communicatively connected with the controller and used for detecting the exhaust gas The pressure of the refrigerant at the mouth.

In the above-mentioned preferred technical solution of the air-conditioning system, the air-conditioning system further includes: a second throttling device, a third throttling device, and a fourth throttling device that are all communicatively connected with the controller; the second throttling device is provided with Between the first heat exchanger group and the liquid pipe; the third throttling device is arranged between the second heat exchanger group and the liquid pipe; the fourth throttling device One end is connected between the first heat exchanger group and the second throttling device, and the other end is connected between the second heat exchanger group and the third throttling device.

In the preferred technical solution of the above-mentioned air-conditioning system, the air-conditioning system further includes: a low-pressure air pipe connected to the suction port; the indoor unit includes a valve box and an indoor heat exchanger connected to the valve box, the air pipe, The liquid pipe and the low-pressure gas pipe are in communication with the valve box.

Those skilled in the art can understand that in the preferred technical solution of the present invention, the air conditioning system includes a compressor, a first reversing device, a second reversing device, a first heat exchanger group, a second heat exchanger group, The air pipe, the liquid pipe, the indoor unit and the first throttling device; the exhaust port of the compressor is connected to the first reversing device and the second reversing device at the same time, and the suction port of the compressor is simultaneously connected to the first reversing device and the second reversing device. The two reversing devices are connected; both ends of the air pipe are respectively connected to the second reversing device and the indoor unit; one end of the first heat exchanger group is connected to the first reversing device, and the other end is connected to the indoor unit through the liquid pipe; One end of the heat exchanger group is connected to the first reversing device, and the other end is connected to the indoor unit through the liquid pipe; the first throttling device is arranged between the first reversing device and the exhaust port, and is used to regulate the flow into the first The refrigerant flow rate of the reversing device; the first reversing device and the second reversing device are configured such that when the first heat exchanger group is defrosted, the air pipe and the first heat exchanger group communicate with the exhaust port, and the second heat exchange When the second heat exchanger group is defrosted, the air pipe and the second heat exchanger group are connected with the exhaust port, and the first heat exchanger group is connected with the suction port; when cooling, the first heat The exchanger group and the second heat exchanger group are connected with the exhaust port, and the air pipe is connected with the suction port; during heating, the first heat exchanger group and the second heat exchanger group are connected with the suction port, and the air pipe is connected with the exhaust port. The control method includes: determining the working mode of the air-conditioning system, wherein the working mode includes a cooling mode, a heating mode, a first heat exchanger group defrosting mode, and a second heat exchanger group defrosting mode; when the working mode is In the defrosting mode of the first heat exchanger group or the defrosting mode of the second heat exchanger group, the opening degree of the first throttling device is adjusted according to a preset condition.

In this solution, by adjusting the opening degree of the first throttling device, when the first heat exchanger group or the second heat exchanger group is defrosted, the refrigerant flowing to the indoor unit can be increased while meeting the defrosting demand, thereby improving The heating efficiency of the indoor unit ensures the heating effect of the indoor unit.

Specifically, through the first reversing device and the second reversing device, the flow direction of the refrigerant can be adjusted, namely:

When the first heat exchanger group is defrosted, the air pipe and the first heat exchanger group are connected with the exhaust port, and the second heat exchanger group is connected with the suction port;

When the second heat exchanger group is defrosted, the air pipe and the second heat exchanger group are connected with the exhaust port, and the first heat exchanger group is connected with the suction port;

When refrigerating, the first heat exchanger group and the second heat exchanger group are connected with the exhaust port, and the air pipe is connected with the suction port;

During heating, the first heat exchanger group and the second heat exchanger group are in communication with the air inlet, and the air pipe is in communication with the air outlet.

The control method of this technical solution includes: determining the working mode of the air-conditioning system, wherein the working mode includes a cooling mode, a heating mode, a first heat exchanger group defrosting mode, and a second heat exchanger group defrosting mode; when the working mode is In the defrosting mode of the first heat exchanger group or the defrosting mode of the second heat exchanger group, part of the refrigerant discharged from the compressor flows into the indoor unit, and part of the refrigerant flows into the defrosting first heat exchanger group or the second heat exchanger group. Heat exchanger group. Adjust the opening degree of the first throttling device according to the preset conditions to increase the flow into the indoor unit under the premise that the pressure of the refrigerant in the defrosting first heat exchanger group or the second heat exchanger group meets the requirements of defrosting The refrigerant flow rate can keep the heating efficiency of the indoor unit during defrosting. At the same time, it can effectively prevent the accumulation of refrigerant in the defrosted first heat exchanger group or the second heat exchanger group, and ensure the heating effect of the indoor unit.

Further, by providing the first pressure sensor, the real-time pressure of the refrigerant of the first reversing device, that is, the pressure of the refrigerant of the defrosted first heat exchanger group or the second heat exchanger group can be obtained through the first pressure sensor, Adjust the opening degree of the first throttling device according to the comparison between the real-time pressure and the target condensing pressure, so that the pressure of the refrigerant in the first heat exchanger group or the second heat exchanger group that is defrosted can reach the defrosting demand, and prevent defrosting The pressure of the refrigerant in the first heat exchanger group or the second heat exchanger group is too low, resulting in too low defrosting efficiency, or the refrigerant pressure in the first heat exchanger group or the second heat exchanger group that defrosts is too low High, resulting in low heating efficiency of the indoor unit.

Further, by providing the second pressure sensor, the discharge pressure at the discharge port of the compressor can be obtained through the second pressure sensor, and the target condensing pressure can be determined according to the discharge pressure, which can make the distribution of the refrigerant more reasonable.

Further, when the working mode is the defrosting of the first heat exchanger group, the second throttling device is closed and the fourth throttling device is opened. In this way, the refrigerant in the first heat exchanger group directly passes through the fourth throttling valve. It flows into the second heat exchanger group to prevent the refrigerant from failing to flow in the first heat exchanger group due to the low pressure of the refrigerant in the first heat exchanger group.

Similarly, when the working mode is the defrosting of the second heat exchanger group, close the third throttling device and open the fourth throttling device. In this way, the refrigerant in the second heat exchanger group directly passes through the fourth throttling valve. It flows into the first heat exchanger group to prevent the refrigerant from failing to flow in the second heat exchanger group due to the low pressure of the refrigerant in the second heat exchanger group.

In the air conditioning system provided by the present invention, the controller adjusts the opening of the first throttling device so that when the first heat exchanger group or the second heat exchanger group is defrosted, the flow to the indoor unit can be increased while meeting the defrosting demand. The cooling medium can improve the heating efficiency of the indoor unit and ensure the heating effect of the indoor unit.

Further, by providing the first pressure sensor, the real-time pressure of the refrigerant of the first reversing device, that is, the pressure of the refrigerant of the defrosted first heat exchanger group or the second heat exchanger group can be obtained through the first pressure sensor, The controller adjusts the opening degree of the first throttling device according to the comparison between the real-time pressure and the target condensing pressure, so that the pressure of the refrigerant in the first heat exchanger group or the second heat exchanger group that is defrosted can reach the defrosting demand, preventing The pressure of the refrigerant in the defrosted first heat exchanger group or the second heat exchanger group is too low, resulting in too low defrosting efficiency, or the refrigerant in the defrosted first heat exchanger group or the second heat exchanger group The pressure is too high, causing the heating efficiency of the indoor unit to be too low.

Further, by providing the second pressure sensor, the controller can obtain the discharge pressure at the discharge port of the compressor through the second pressure sensor, and determine the target condensing pressure according to the discharge pressure, which can make the distribution of the refrigerant more reasonable.

Furthermore, when the first heat exchanger group is defrosting, the controller closes the second throttling device and opens the fourth throttling device. In this way, the refrigerant in the first heat exchanger group flows directly into the fourth throttling valve. The second heat exchanger group prevents the refrigerant from failing to flow in the first heat exchanger group due to the low pressure of the refrigerant in the first heat exchanger group.

In the same way, when the second heat exchanger group is defrosting, the controller closes the third throttling device and opens the fourth throttling device. In this way, the refrigerant in the second heat exchanger group flows directly into the fourth throttling valve. The first heat exchanger group prevents the refrigerant from failing to flow in the second heat exchanger group due to the low pressure of the refrigerant in the second heat exchanger group.

Description of the drawings

Hereinafter, the control method of the air-conditioning system and the air-conditioning system of the present invention will be described with reference to the accompanying drawings. In the attached picture:

Fig. 1 is a flow chart of a control method of an air conditioning system in a first embodiment of the present invention;

2 is a logical block diagram of the control method of the air conditioning system in the first embodiment of the present invention;

3 is a schematic diagram of the structure of the air conditioning system during cooling in the first embodiment of the present invention;

4 is a schematic diagram of the structure of the air conditioning system during heating in the first embodiment of the present invention;

5 is a schematic diagram of the structure of the first heat exchanger group of the air conditioning system during defrosting in the first embodiment of the present invention;

6 is a schematic diagram of the structure of the second heat exchanger group of the air conditioning system during defrosting in the first embodiment of the present invention;

7 is a schematic diagram of the structure of the air conditioning system during cooling in the second embodiment of the present invention;

8 is a schematic diagram of the structure of the air conditioning system during heating in the second embodiment of the present invention;

9 is a schematic diagram of the structure of the first heat exchanger group of the air conditioning system during defrosting in the second embodiment of the present invention;

10 is a schematic diagram of the structure of the second heat exchanger group of the air conditioning system during defrosting in the second embodiment of the present invention.

List of reference signs

10. Compressor; 20, the first reversing device, 21, the first four-way valve, 22, the second four-way valve, 23, the first electric control valve, 24, the second electric control valve, 25, the third electric Control valve, 26, fourth electric control valve; 30, second reversing device; 40, first heat exchanger group; 50, second heat exchanger group; 60, gas pipe; 70, liquid pipe; 81, indoor heat Exchanger; 90, the first throttling device; 100, the first pressure sensor; 110, the second pressure sensor; 120, the second throttling device; 130, the third throttling device; 140, the fourth throttling device; 150 ,Gas-liquid separator.

Detailed ways

The preferred embodiments of the present invention will be described below with reference to the drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present invention, and are not intended to limit the protection scope of the present invention. For example, although the compressor and the air pipe in the drawings are connected through the first four-way valve, this connection relationship is not static, and those skilled in the art can adjust it as needed to adapt to specific applications. For example, the first four-way valve can be replaced with three electronically controlled valves. One end of the three electronically controlled valves is connected to each other, and the other end of the three electronically controlled valves is connected to the compressor's discharge port and the compressor's suction port respectively. And the trachea is connected.

For example, although this embodiment is described in conjunction with a dual-pipe air conditioning unit, this is not intended to limit the scope of protection of the present invention. Those skilled in the art can apply the present invention to other applications without departing from the principle of the present invention. Scenes. For example, the present invention can also be applied to a three-pipe air conditioning unit.

It should be noted that in the description of the present invention, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. The term of the indicated direction or positional relationship is based on the direction or positional relationship shown in the drawings, which is only for ease of description, and does not indicate or imply that the device or element must have a specific orientation, be configured and operated in a specific orientation Therefore, it cannot be understood as a limitation of the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance.

In addition, it should be noted that, in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, they can be fixed or fixed. It is a detachable connection or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication between two components. For those skilled in the art, the specific meaning of the above-mentioned terms in the present invention can be understood according to specific circumstances.

Example 1

First, referring to FIGS. 1 to 3, the control method of the air conditioning system of the present invention will be described. 1 is a block diagram of the control method of the air-conditioning system in the first embodiment of the present invention; Fig. 2 is a block diagram of the control method of the air-conditioning system in the first embodiment of the present invention; Fig. 3 is a block diagram of the control method of the air conditioning system in the first embodiment of the present invention A schematic diagram of the structure of the air conditioning system during cooling in the first embodiment.

As shown in Figures 1 to 3, in order to solve the problem of poor heating effect of the indoor unit when the outdoor heat exchanger is defrosted in the existing air conditioning unit, the present invention provides a control method of an air conditioning system. 3. The air conditioning system includes the compressor 10, the first reversing device 20, the second reversing device 30, the first heat exchanger group 40, the second heat exchanger group 50, the air pipe 60, the liquid pipe 70, and the indoor unit (Figure Not shown in) and the first throttling device 90; the exhaust port of the compressor 10 is in communication with the first reversing device 20 and the second reversing device 30 at the same time, and the suction port of the compressor 10 is simultaneously connected with the first reversing device The device 20 and the second reversing device 30 are connected; the two ends of the air pipe 60 are respectively connected to the second reversing device 30 and the indoor unit; one end of the first heat exchanger group 40 is connected to the first reversing device 20, and the other end passes through The liquid pipe 70 is connected to the indoor unit; one end of the second heat exchanger group 50 is connected to the first reversing device 20, and the other end is connected to the indoor unit through the liquid pipe 70; the first throttling device 90 is provided in the first reversing device Between 20 and the exhaust port, and used to adjust the flow of refrigerant flowing into the first reversing device 20; the first reversing device 20 and the second reversing device 30 are configured to: when the first heat exchanger group 40 is defrosted , The air pipe 60 and the first heat exchanger group 40 are in communication with the exhaust port, and the second heat exchanger group 50 is in communication with the suction port; when the second heat exchanger group 50 is defrosted, the air pipe 60 and the second heat exchanger group 50 is connected to the exhaust port, the first heat exchanger group 40 is connected to the suction port; during cooling, the first heat exchanger group 40 and the second heat exchanger group 50 are connected to the exhaust port, and the air pipe 60 is connected to the suction port When heating, the first heat exchanger group 40 and the second heat exchanger group 50 communicate with the suction port, and the air pipe 60 communicates with the exhaust port; referring back to FIG. 1, the control method includes:

Step S102: Determine a working mode of the air conditioning system, where the working mode includes a cooling mode, a heating mode, a first heat exchanger group defrosting mode, and a second heat exchanger group defrosting mode;

Step S104, when the working mode is the first heat exchanger group defrosting mode or the second heat exchanger group defrosting mode, adjust the opening degree of the first throttling device 90 according to a preset condition.

Through the above arrangement, by adjusting the opening degree of the first throttle device 90, when the first heat exchanger group 40 or the second heat exchanger group 50 is defrosted, the defrosting of the first heat exchanger group 40 or the second heat exchanger group 40 On the premise that the refrigerant pressure in the second heat exchanger group 50 meets the defrosting requirement, the flow rate of the refrigerant flowing into the indoor unit is increased so as to maintain the heating efficiency of the indoor unit during defrosting. At the same time, it can also effectively prevent the accumulation of refrigerant in the first heat exchanger group 40 or the second heat exchanger group 50 that is defrosted, so as to ensure the heating effect of the indoor unit.

Further, the air conditioning system further includes a first pressure sensor 100, which is arranged between the first throttle device 90 and the first reversing device 20, and adjusts the first throttle device 90 according to a preset condition, which specifically includes : Determine the target condensing pressure; determine the real-time pressure of the refrigerant flowing into the first reversing device 20; compare the condensing pressure and the real-time pressure, and adjust the opening degree of the first throttling device 90 according to the comparison result.

By providing the first pressure sensor 100, the real-time pressure of the refrigerant of the first reversing device 20 can be obtained through the first pressure sensor 100, that is, the refrigerant pressure of the first heat exchanger group 40 or the second heat exchanger group 50 that is defrosted. Pressure, adjust the opening degree of the first throttling device 90 based on the comparison between the real-time pressure and the target condensing pressure, so that the refrigerant pressure in the first heat exchanger group 40 or the second heat exchanger group 50 that is defrosted can reach defrosting It is necessary to prevent the pressure of the refrigerant in the first heat exchanger group 40 or the second heat exchanger group 50 from being defrosted from being too low, resulting in too low defrosting efficiency, or the first heat exchanger group 40 or the second heat exchanger being defrosted The pressure of the refrigerant in the exchanger group 50 is too high, which causes the heating efficiency of the indoor unit to be too low.

Further, the air conditioning system further includes a second pressure sensor 110 located at the exhaust port. The second pressure sensor 110 is used to detect the refrigerant pressure at the exhaust port and determine the target condensing pressure, which specifically includes: determining and acquiring the Exhaust pressure; According to the exhaust pressure, determine the target condensing pressure. For example, the target condensing pressure is determined according to the correspondence table between the exhaust pressure and the target condensing pressure, or the target condensing pressure is determined according to the fitting formula between the exhaust pressure and the target condensing pressure, etc., where the exhaust pressure and the target condensing pressure The correspondence table or fitting formula between the pressures can be determined through experiments, and the correspondence table or fitting formula is different for different refrigerants.

By providing the second pressure sensor 110, the discharge pressure at the discharge port of the compressor 10 can be obtained through the second pressure sensor 110, and the target condensing pressure can be determined according to the discharge pressure, which can make the distribution of the refrigerant more reasonable.

Further, the air conditioning system further includes a second throttling device 120, a third throttling device 130, and a fourth throttling device 140; the second throttling device 120 is provided between the first heat exchanger group 40 and the liquid pipe 70; The third throttling device 130 is arranged between the second heat exchanger group 50 and the liquid pipe 70; one end of the fourth throttling device 140 is connected between the first heat exchanger group 40 and the second throttling device 120, and the other One end is connected between the second heat exchanger group 50 and the third throttling device 130. The control method further includes: when the working mode is the first heat exchanger group defrosting mode, turning off the second throttling device and turning on the fourth throttling device; when the working mode is the second heat exchanger group defrosting mode, turning off The third throttling device opens the fourth throttling device; when the working mode is the cooling mode or the heating mode, the fourth throttling device is turned off, and the second throttling device and the third throttling device are opened.

When the working mode is defrosting of the first heat exchanger group, close the second throttling device and open the fourth throttling device. In this way, the refrigerant in the first heat exchanger group flows directly into the second heat exchanger group through the fourth throttling valve. The heat exchanger group prevents the refrigerant from failing to flow in the first heat exchanger group due to the low pressure of the refrigerant in the first heat exchanger group.

In the following, referring to FIG. 2, a possible control process of the control method of the present application will be introduced. As shown in Figure 2, in a possible implementation manner, the control method of the air conditioning system includes:

Step S202: Determine a working mode of the air conditioning system, where the working mode includes a cooling mode, a heating mode, a first heat exchanger group defrosting mode, and a second heat exchanger group defrosting mode;

Step S204, judging whether the working mode is the first heat exchanger group defrosting mode, and generating a first judgment result;

When the first judgment result is yes, step S206 is executed, the second throttle device 120 is closed, and the fourth throttle device 140 is opened;

Otherwise, when the first judgment result is no, step S208, it is judged whether the working mode is the second heat exchanger group defrosting mode, and the second judgment result is generated;

When the second judgment result is yes, perform step S210, close the third throttle device 130, and open the fourth throttle device 140;

Otherwise, when the second judgment result is no, perform step S212, turn off the fourth throttle device 140, and turn on the second throttle device 120 and the third throttle device 130;

After step S206 or step S210 is executed, step S214 is executed to obtain the discharge pressure at the discharge port of the compressor 10;

Step S216: Determine the target condensing pressure according to the exhaust pressure;

Step S218, acquiring the real-time pressure of the refrigerant flowing into the first reversing device 20;

Step S220, judging whether the target condensing pressure is greater than the real-time pressure, and generating a third judgment result;

When the third judgment result is yes, execute step S224 to reduce the opening degree of the first throttle device 90;

When the third judgment result is no, step S222 is executed to judge whether the target condensing pressure is less than the real-time pressure, and a fourth judgment result is generated;

When the fourth judgment result is yes, step S226 is executed to increase the opening degree of the first throttle device 90, and step S220 is executed again until the fourth judgment result is no.

Step S228: Continue to determine whether the air-conditioning operation mode has changed, until the determination result is yes, and then restart step S202.

In this solution, step S202 is first performed to determine the working mode of the air conditioning system, and then by performing steps S204 and S208, it is determined that the working mode of the air conditioning system belongs to the first heat exchanger group defrosting mode and the second heat exchanger group defrosting mode. Which one of frost mode, cooling mode, and heating mode?

When the first judgment result is yes, the air conditioning system is in the defrosting mode of the first heat exchanger group. At this time, the second throttling device 120 is closed and the fourth throttling device 140 is opened. In this way, the first heat exchanger group The refrigerant in the group 40 flows directly into the second heat exchanger group 50 through the fourth throttle valve to prevent the refrigerant from being unable to flow in the first heat exchanger group 40 due to the low pressure of the refrigerant in the first heat exchanger group 40.

When the second judgment result is yes, the air conditioning system is in the defrosting mode of the second exchanger group. At this time, the third throttling device 130 is closed and the fourth throttling device 140 is opened. In this way, the second heat exchanger group 50 The refrigerant of the group flows directly into the first heat exchanger group 40 through the fourth throttle valve to prevent the refrigerant from failing to flow in the second heat exchanger group 50 due to the low pressure of the refrigerant in the second heat exchanger group 50.

After step S206 or step S210 is executed, step S214 is executed to obtain the discharge pressure at the discharge port of the compressor 10; in step S216, the target condensing pressure is determined according to the discharge pressure.

Specifically, the correspondence between the exhaust pressure and the target condensing pressure is determined in advance through experiments, and after the exhaust pressure is obtained, the target condensing pressure is determined according to the correspondence between the exhaust pressure and the target condensing pressure.

Step S218, acquiring the real-time pressure flowing to the first reversing device 20;

When the fourth judgment result is yes, execute step S226 to increase the opening degree of the first throttle device 90;

After step S224 or step S226 is executed, step S220 is executed again until the fourth judgment result is no.

Through the above arrangement, according to the relationship between the real-time pressure and the condensing pressure, the opening degree of the first throttling device 90 is increased or decreased, so that the real-time pressure can correspond to the target condensing pressure.

Among them, the heating efficiency of the indoor unit is the heat exchange efficiency of the indoor heat exchanger 81.

Example 2

The air-conditioning system of the present invention will be described below with reference to FIGS. 3 to 6. 4 is a schematic diagram of the structure of the air-conditioning system during heating in the first embodiment of the present invention; FIG. 5 is the structure of the first heat exchanger group 40 of the air-conditioning system in the first embodiment of the present invention during defrosting Schematic diagram; Figure 6 is a schematic structural diagram of the second heat exchanger group 50 of the air conditioning system in the first embodiment of the present invention when defrosting.

As shown in Figures 3 to 6, the present application also provides an air conditioning system, including: a compressor 10, a first reversing device 20, a second reversing device 30, a first heat exchanger group 40, a second heat The exchanger group 50, the air pipe 60, the liquid pipe 70, the indoor unit (not shown in the figure), the first throttling device 90 and the controller (not shown in the figure); the exhaust port of the compressor 10 is at the same time as the first The reversing device 20 and the second reversing device 30 are in communication, and the suction port of the compressor 10 is simultaneously connected to the first reversing device 20 and the second reversing device 30; both ends of the air pipe 60 are respectively connected to the second reversing device 30 And the indoor unit is connected; one end of the first heat exchanger group 40 is connected to the first reversing device 20, and the other end is connected to the indoor unit through the used liquid pipe 70; one end of the second heat exchanger group 50 is connected to the first reversing device The device 20 is connected, and the other end is connected to the indoor unit through the liquid pipe 70; the first throttling device 90 is provided between the first reversing device 20 and the exhaust port, and is used to adjust the flow of refrigerant flowing into the first reversing device 20 ; The first reversing device 20 and the second reversing device 30 are configured such that when the first heat exchanger group 40 is defrosted, the air pipe 60 and the first heat exchanger group 40 communicate with the exhaust port, and the second heat exchanger The group 50 is connected to the suction port; when the second heat exchanger group 50 is defrosted, the air pipe 60 and the second heat exchanger group 50 are connected to the exhaust port, and the first heat exchanger group 40 is connected to the suction port; , The first heat exchanger group 40 and the second heat exchanger group 50 are connected to the exhaust port, and the air pipe 60 is connected to the suction port; during heating, the first heat exchanger group 40 and the second heat exchanger group 50 are connected to The suction port is in communication, and the air pipe 60 is in communication with the exhaust port; the controller is in communication with the first throttling device 90.

After using the above setting method, in this solution, the controller adjusts the opening of the first throttling device 90 so that when the first heat exchanger group 40 or the second heat exchanger group 50 is defrosted, it can meet the defrosting requirements. At the same time, the refrigerant flowing to the indoor unit can be increased, thereby improving the heating efficiency of the indoor unit and ensuring the heating effect of the indoor unit.

Further, the air conditioning system further includes: a first pressure sensor 100, which is provided between the first throttle device 90 and the first reversing device 20, and the first pressure sensor 100 is communicatively connected with the controller.

By providing the first pressure sensor 100, the real-time pressure of the refrigerant of the first reversing device 20 can be obtained through the first pressure sensor 100, that is, the refrigerant pressure of the first heat exchanger group 40 or the second heat exchanger group 50 that is defrosted. The controller adjusts the opening degree of the first throttle device 90 according to the comparison between the real-time pressure and the target condensing pressure, so that the refrigerant pressure in the first heat exchanger group 40 or the second heat exchanger group 50 that defrosts can reach Defrosting needs, to prevent the pressure of the refrigerant in the first heat exchanger group 40 or the second heat exchanger group 50 that is defrosted from being too low, resulting in too low defrosting efficiency, or the defrosting of the first heat exchanger group 40 or the second heat exchanger group 40 The pressure of the refrigerant in the second heat exchanger group 50 is too high, which causes the heating efficiency of the indoor unit to be too low.

Further, the air conditioning system further includes: a second pressure sensor 110 arranged at the exhaust port, the second pressure sensor 110 is communicatively connected with the controller and used for detecting the pressure of the refrigerant at the exhaust port.

By providing the second pressure sensor 110, the controller can obtain the discharge pressure at the discharge port of the compressor 10 through the second pressure sensor 110, and determine the target condensing pressure according to the discharge pressure, which can make the distribution of the refrigerant more reasonable.

Further, the air conditioning system further includes: a second throttling device 120, a third throttling device 130, and a fourth throttling device 140, which are all communicatively connected with the controller; the second throttling device 120 is provided in the first heat exchanger group 40 and the liquid pipe 70; the third throttling device 130 is provided between the second heat exchanger group 50 and the liquid pipe 70; one end of the fourth throttling device 140 is connected to the first heat exchanger group 40 and the second Between the throttling devices 120, the other end is connected between the second heat exchanger group 50 and the third throttling device 130.

When the first heat exchanger group 40 is defrosting, the controller closes the second throttling device 120 and opens the fourth throttling device 140. In this way, the refrigerant in the first heat exchanger group 40 directly passes through the fourth throttling valve. The flow into the second heat exchanger group 50 prevents the refrigerant from failing to flow in the first heat exchanger group 40 due to the low pressure of the refrigerant in the first heat exchanger group 40.

When the second heat exchanger group 50 is defrosted, the controller closes the third throttling device 130 and opens the fourth throttling device 140. In this way, the refrigerant in the second heat exchanger group 50 directly passes through the fourth throttling valve. The flow into the first heat exchanger group 40 prevents the refrigerant from failing to flow in the second heat exchanger group 50 due to the low pressure of the refrigerant in the second heat exchanger group 50.

Further, in this embodiment, the first reversing device 20 includes a first four-way valve 21 and a second four-way valve 22, the D of the first four-way valve 21 is connected and the D of the second four-way valve 22 is connected to The discharge port of the compressor 10 is connected, the S connection of the first four-way valve 21 and the S connection of the second four-way valve 22 are connected to the suction port of the compressor 10, and the C connection of the first four-way valve 21 is connected to the first The heat exchanger group 40 is in communication, and the C connector of the second four-way valve 22 is in communication with the second heat exchanger group 50. In addition, the E connector of the first four-way valve 21 and the E connector of the second four-way valve 22 are blocked or cut off by setting a capillary tube with the suction port of the compressor 10.

The second reversing device 30 is an adjusting four-way valve. The D connector of the adjusting four-way valve is connected with the exhaust port of the compressor 10, the S connector of the adjusting four-way valve is connected with the suction port of the compressor 10, and the adjusting four-way valve is connected with the suction port of the compressor 10. The E takeover is in communication with the trachea 60. In addition, the C connecting pipe of the regulating four-way valve is blocked or cut off by setting a capillary tube with the suction port of the compressor 10.

3, during cooling, the first four-way valve 21, the second four-way valve 22 and the regulating four-way valve are powered off, the second throttling device 120 is opened to the set opening, and the third throttling device 130 is opened to Set the opening degree, the fourth throttle device 140 is closed, the C connector and D connector of the first four-way valve 21 are connected, the C connector and D connector of the second four-way valve 22 are connected, and the S connector and E of the four-way valve are adjusted. Take over the connection.

The high-temperature and high-pressure gas refrigerant discharged from the exhaust port of the compressor 10 flows into the first heat exchanger group 40 and the second heat exchanger group 50 through the first four-way valve 21 and the second four-way valve 22, and flows in the first heat The heat released in the exchanger group 40 and the second heat exchanger group 50 becomes a high-pressure subcooled liquid refrigerant, which is throttled by the throttling device of the indoor unit and becomes a low-temperature and low-pressure gas-liquid two-phase refrigerant. After the heat is absorbed in 81, it becomes a low-temperature and low-pressure refrigerant gas, and finally flows back to the suction port of the compressor 10 through the air pipe 60 to complete the cycle.

4, during heating, the first four-way valve 21, the second four-way valve 22 and the regulating four-way valve are powered on, the second throttling device 120 is opened to the set opening, and the third throttling device 130 is opened To the set opening, the fourth throttle device 140 is closed, the C connector of the first four-way valve 21 is connected to the S connector, the C connector of the second four-way valve 22 is connected to the S connector, and the D connector of the four-way valve is adjusted to E takes over the connection.

The high-temperature and high-pressure gas refrigerant discharged from the exhaust port of the compressor 10 flows into the indoor heat exchanger 81 through the regulating four-way valve and the air pipe 60, and releases heat in the indoor heat exchanger 81 to become a high-pressure subcooled liquid refrigerant, and finally passes through The liquid pipe 70 flows to the second throttling device 120 and the third throttling device 130, and after being throttled by the second throttling device 120 and the third throttling device 130, it becomes a low-temperature and low-pressure gas-liquid two-phase refrigerant. The phase refrigerant absorbs heat in the first heat exchanger group 40 and the second heat exchanger group 50 into low-temperature and low-pressure gas, and finally flows back to the suction of the compressor 10 through the first four-way valve 21 and the second four-way valve 22 Mouth, complete the cycle.

5, when the first heat exchanger group 40 is defrosted, the first four-way valve 21 is powered off, the second four-way valve 22 and the regulating four-way valve are powered on, the second throttling device 120 is closed, and the third The flow device 130 is opened to the set opening degree, and the fourth throttle device 140 is opened to the set opening degree. At this time, the C connector and the D connector of the first four-way valve 21 are connected, and the C connector and S of the second four-way valve 22 are connected. Take over the connection, adjust the D connection and E connection of the four-way valve to connect.

Part of the high-temperature and high-pressure gas refrigerant discharged from the exhaust port of the compressor 10 flows into the indoor heat exchanger 81 through the regulating four-way valve and the air pipe 60, and releases heat in the indoor heat exchanger 81 to become a high-pressure supercooled liquid refrigerant. , Finally flows to the third throttling device 130 through the liquid pipe 70; the other part flows into the first heat exchanger group 40 through the first four-way valve 21, and becomes high-pressure supercooled after the heat is released in the first heat exchanger group 40 The liquid refrigerant finally flows to the fourth throttling device 140. After being throttled by the third throttling device 130 and the fourth throttling device 140, the high-pressure supercooled liquid refrigerant becomes a low-temperature and low-pressure gas-liquid two-phase refrigerant, and is exchanged in the second heat. After the heat is absorbed in the unit 50, it becomes a low-temperature and low-pressure gas refrigerant, and finally flows back to the suction port of the compressor 10 through the second four-way valve 22 to complete the cycle.

It should also be pointed out that the high-pressure supercooled liquid refrigerant produces a pressure drop after being throttled by the third throttling device 130 and the fourth throttling device 140. By closing the second throttling device 120 and opening the fourth throttling device 140, it can prevent A situation where the refrigerant cannot flow in the first heat exchanger group 40 due to the low pressure of the refrigerant in the first heat exchanger group 40.

Referring to Figure 6, when the second heat exchanger unit 50 is defrosted, the second four-way valve 22 is powered off, the first four-way valve 21 and the regulating four-way valve are powered on, and the second throttling device 120 is opened to the set opening. At this time, the third throttle device 130 is closed, and the fourth throttle device 140 is opened to the set opening. At this time, the C connector and S connector of the first four-way valve 21 are connected, and the C connector of the second four-way valve 22 is connected to D Take over the connection, adjust the D connection and E connection of the four-way valve to connect.

Part of the high-temperature and high-pressure gas refrigerant discharged from the exhaust port of the compressor 10 flows into the indoor heat exchanger 81 through the regulating four-way valve and the air pipe 60, and releases heat in the indoor heat exchanger 81 to become a high-pressure supercooled liquid refrigerant. , And finally flow to the second throttling device 120 through the liquid pipe 70; the other part flows into the second heat exchanger group 50 through the second four-way valve 22, and becomes high-pressure supercooled after the heat is released in the second heat exchanger group 50 The liquid refrigerant finally flows to the fourth throttling device 140. After being throttled by the second throttling device 120 and the fourth throttling device 140, the high-pressure supercooled liquid refrigerant becomes a low-temperature and low-pressure gas-liquid two-phase refrigerant, and is exchanged in the first heat. After the heat is absorbed in the unit 40, it becomes a low-temperature and low-pressure gas refrigerant, and finally flows back to the suction port of the compressor 10 through the first four-way valve 21 to complete the cycle.

It should also be pointed out that the high-pressure supercooled liquid refrigerant produces a pressure drop after being throttled by the second throttle device 120 and the fourth throttle device 140. By closing the third throttle device 130 and opening the fourth throttle device 140, it can prevent A situation where the refrigerant cannot flow in the second heat exchanger group 50 due to the low pressure of the refrigerant in the second heat exchanger group 50.

Further, a gas-liquid separator 150 is connected in series with the suction port of the compressor 10 to separate the liquid flowing to the suction port and prevent liquid hammer.

In a possible implementation, the first heat exchanger group 40 includes one heat exchanger.

In an alternative embodiment, the first heat exchanger group 40 includes a plurality of heat exchangers.

Further, a plurality of heat exchangers are arranged in parallel, and each heat exchanger is correspondingly provided with an electric control valve, so that a corresponding number of heat exchangers can be opened as required, which is convenient to control and can meet various requirements.

Alternatively, a plurality of heat exchangers can also be arranged in series.

In a possible implementation, the second heat exchanger group 50 includes one heat exchanger.

In an alternative embodiment, the second heat exchanger group 50 includes a plurality of heat exchangers.

Alternatively, a plurality of heat exchangers can also be arranged in series.

Example 3

Hereinafter, an alternative embodiment of the above-mentioned air conditioning system will be described with reference to FIGS. 7 to 10. 7 is a schematic diagram of the structure of the air conditioning system during cooling in the second embodiment of the present invention; FIG. 8 is a schematic diagram of the structure of the air conditioning system during heating in the second embodiment of the present invention; FIG. 9 is the first embodiment of the present invention The structure diagram of the first heat exchanger group 40 of the air-conditioning system in the second embodiment when defrosting; FIG. 10 is the structure diagram of the second heat exchanger group 50 of the air-conditioning system in the second embodiment of the present invention when defrosting .

The difference between this embodiment and the second embodiment is that the first reversing device 20 includes a first electric control valve 23, a second electric control valve 24, a third electric control valve 25, and a fourth electric control valve 26.

The first electronic control valve 23 is connected between the discharge port of the compressor 10 and the first heat exchanger group 40, and the second electronic control valve 24 is connected between the suction port of the compressor 10 and the first heat exchanger group 40. Meanwhile, the third electronic control valve 25 is connected between the discharge port of the compressor 10 and the second heat exchanger group 50, and the fourth electronic control valve 26 is connected between the suction port of the compressor 10 and the second heat exchanger group 50. Between 50.

7 (the direction of the arrow in the figure is the refrigerant flow direction), during cooling, the first electronic control valve 23 and the third electronic control valve 25 are conducted, the second electronic control valve 24 and the fourth electronic control valve 26 are disconnected, and the first electronic control valve 24 and the fourth electronic control valve 26 are disconnected. The second throttle device 120 and the third throttle device 130 are opened to the set opening degree, and the fourth throttle device 140 is closed. The regulating electric control valve is powered off, and the S connection and E connection of the regulating four-way valve are connected.

The high-temperature and high-pressure gas refrigerant discharged from the exhaust port of the compressor 10 flows into the first heat exchanger group 40 and the second heat exchanger group 50 through the first electronic control valve 23 and the third electronic control valve 25, and flows into the first heat exchanger group 40 and the second heat exchanger group 50. The heat released in the exchanger group 40 and the second heat exchanger group 50 becomes a high-pressure subcooled liquid refrigerant, and after being throttled by the throttling device of the indoor unit, it becomes a low-temperature and low-pressure gas-liquid two-phase refrigerant, which exchanges heat in the room After the heat is absorbed in the device 81, it becomes a low-temperature and low-pressure refrigerant gas, and finally flows back to the suction port of the compressor 10 through the air pipe 60 to complete the cycle.

8 (the direction of the arrow in the figure is the direction of refrigerant flow), during heating, the first electronic control valve 23 and the third electronic control valve 25 are disconnected, and the second electronic control valve 24 and the fourth electronic control valve 26 are connected , The second throttling device 120 and the third throttling device 130 are opened to the set opening degree, and the fourth throttling device 140 is closed. Power on the regulating four-way valve, and connect the D connector and E connector of the regulating four-way valve.

The high-temperature and high-pressure gas refrigerant discharged from the exhaust port of the compressor 10 flows into the indoor heat exchanger 81 through the regulating four-way valve and the air pipe 60, and releases heat in the indoor heat exchanger 81 to become a high-pressure subcooled liquid refrigerant, and finally passes through The liquid pipe 70 flows to the second throttling device 120 and the third throttling device 130, and after being throttled by the second throttling device 120 and the third throttling device 130, it becomes a low-temperature and low-pressure gas-liquid two-phase refrigerant. The phase refrigerant absorbs heat in the first heat exchanger group 40 and the second heat exchanger group 50 into low-temperature and low-pressure gas, and finally flows back to the suction of the compressor 10 through the second electronic control valve 24 and the fourth electronic control valve 26 Mouth, complete the cycle.

9 (the direction of the arrow in the figure is the direction of refrigerant flow), when the first heat exchanger group 40 is defrosted, the second electronic control valve 24 and the third electronic control valve 25 are disconnected, and the first electronic control valve 23 and the second electronic control valve The four electronic control valve 26 is turned on, the second throttle device 120 is closed, the third throttle device 130 is opened to the set opening, and the fourth throttle device 140 is opened to the set opening. Power on the regulating four-way valve, and connect the D connector and E connector of the regulating four-way valve.

Part of the high-temperature and high-pressure gas refrigerant discharged from the exhaust port of the compressor 10 flows into the indoor heat exchanger 81 through the regulating four-way valve and the air pipe 60, and releases heat in the indoor heat exchanger 81 to become a high-pressure supercooled liquid refrigerant. , Finally flows to the third throttling device 130 through the liquid pipe 70; the other part flows into the first heat exchanger group 40 through the first electronic control valve 23, and becomes high-pressure supercooled after the heat is released in the first heat exchanger group 40 The liquid refrigerant finally flows to the fourth throttling device 140. After being throttled by the third throttling device 130 and the fourth throttling device 140, the high-pressure supercooled liquid refrigerant becomes a low-temperature and low-pressure gas-liquid two-phase refrigerant, and is exchanged in the second heat. After the heat is absorbed in the assembly 50, it becomes a low-temperature and low-pressure gas refrigerant, and finally flows back to the suction port of the compressor 10 through the fourth electronic control valve 26 to complete the cycle.

10 (the direction of the arrow in the figure is the direction of refrigerant flow), when the second heat exchanger unit 50 is defrosted, the first electronic control valve 23 and the fourth electronic control valve 26 are disconnected, and the second electronic control valve 24 and the second electronic control valve 24 are The three electronic control valve 25 is turned on, the second throttle device 120 is opened to the set opening degree, the third throttle device 130 is closed, and the fourth throttle device 140 is opened to the set opening degree. Power on the regulating four-way valve, and connect the D connector and E connector of the regulating four-way valve.

Part of the high-temperature and high-pressure gas refrigerant discharged from the exhaust port of the compressor 10 flows into the indoor heat exchanger 81 through the regulating four-way valve and the air pipe 60, and releases heat in the indoor heat exchanger 81 to become a high-pressure supercooled liquid refrigerant. , And finally flow to the second throttling device 120 through the liquid pipe 70; the other part flows into the second heat exchanger group 50 through the third electronic control valve 25, and becomes high-pressure supercooled after the heat is released in the second heat exchanger group 50 The liquid refrigerant finally flows to the fourth throttling device 140. After being throttled by the second throttling device 120 and the fourth throttling device 140, the high-pressure supercooled liquid refrigerant becomes a low-temperature and low-pressure gas-liquid two-phase refrigerant, and is exchanged in the first heat. After the heat is absorbed in the unit group 40, it becomes a low-temperature and low-pressure gas refrigerant, and finally flows back to the suction port of the compressor 10 through the second electronic control valve 24 to complete the cycle.

Among them, the first electronically controlled valve 23, the second electronically controlled valve 24, the third electronically controlled valve 25, and the fourth electronically controlled valve 26 are one or a combination of an electromagnetic valve and an electronically controlled shut-off valve.

Although various specific examples of the first electronic control valve 23, the second electronic control valve 24, the third electronic control valve 25, and the fourth electronic control valve 26 are listed above, the protection scope of the present invention is not limited to these specific structures. On the premise that the pipeline can be switched on and off, those skilled in the art can choose other valve structures as needed.

Among them, one or more of the first throttle device 90, the second throttle device 120, the third throttle device 130, and the fourth throttle device 140 are electronic expansion valves or other valves with a controllable opening.

Although various specific examples of the first throttling device 90, the second throttling device 120, the third throttling device 130, and the fourth throttling device 140 are listed above, the protection scope of the present invention is not limited to these specific structures. On the premise that the pipeline can be switched on and off, those skilled in the art can choose other valve structures as needed. For example, in a fixed frequency system or a relatively simple system, the fourth throttling device 140 can also be replaced with a capillary tube or a thermal expansion valve.

Example 4

The difference between this embodiment and Embodiment 2 or Embodiment 3 is that the air conditioning system further includes: a low-pressure air pipe (not shown in the figure), which is connected to the suction port; the indoor unit includes a valve box and an indoor connected to the valve box. The heat exchanger 81, the gas pipe 60, the liquid pipe 70 and the low pressure gas pipe are in communication with the valve box.

In this solution, in this solution, the indoor unit includes an indoor heat exchanger 81 and a valve box. By providing the valve box and a low-pressure air pipe, the air conditioning system can realize the function of cooling and heating at the same time.

The valve box can adjust the passage of the refrigerant and the flow direction of the refrigerant, thereby enabling the indoor heat exchanger 81 to cool or heat. Since the structure of the low-pressure air pipe and the valve box are in the prior art, the specific structure of the valve box will not be repeated here.

It should also be pointed out that through the above embodiments 2 to 4, the air conditioning system realizes the unification of the two-pipe multi-line system and the three-pipe multi-line system, which is convenient for production and maintenance.

The various component embodiments of the present invention may be implemented by hardware, or by software modules running on one or more processors, or by a combination of them. Those skilled in the art should understand that a microprocessor or a digital signal processor (DSP) may be used in practice to implement some or all of the functions of some or all components in the server and the client according to the embodiments of the present invention. The present invention can also be implemented as a device or device program (for example, a PC program and a PC program product) for executing part or all of the methods described herein. Such a program for realizing the present invention may be stored on a PC-readable medium, or may have the form of one or more signals. Such a signal can be downloaded from an Internet website, or provided on a carrier signal, or provided in any other form.

Although the various steps are described in the above-mentioned order in the above-mentioned embodiment, those skilled in the art can understand that in order to achieve the effect of this embodiment, different steps need not be executed in this order, and they can be performed simultaneously ( Parallel) execution or in reverse order, these simple changes are all within the protection scope of the present invention.

In addition, those skilled in the art can understand that although some embodiments described herein include certain features included in other embodiments but not other features, the combination of features of different embodiments means that they are within the scope of the present invention. Within and form different embodiments. For example, in the claims of the present invention, any one of the claimed embodiments can be used in any combination.

It should be noted that although the detailed steps of the method of the present invention are described in detail above, those skilled in the art can combine, split and exchange the order of the above steps without departing from the basic principles of the present invention. The modified technical solution does not change the basic idea of the present invention, and therefore also falls within the protection scope of the present invention.

So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

A control method of an air-conditioning system, characterized in that the air-conditioning system includes a compressor, a first reversing device, a second reversing device, a first heat exchanger group, a second heat exchanger group, a gas pipe, and a liquid pipe , Indoor unit and the first throttling device;

The discharge port of the compressor is simultaneously connected to the first reversing device and the second reversing device, and the suction port of the compressor is simultaneously connected to the first reversing device and the second reversing device. Connect to the device;

Both ends of the air pipe are respectively connected to the second reversing device and the indoor unit;

One end of the first heat exchanger group is in communication with the first reversing device, and the other end is in communication with the indoor unit through the liquid pipe;

One end of the second heat exchanger group is in communication with the first reversing device, and the other end is in communication with the indoor unit through the liquid pipe;

The first throttling device is provided between the first reversing device and the exhaust port, and is used to adjust the flow rate of refrigerant flowing into the first reversing device;

The first reversing device and the second reversing device are configured as:

When the first heat exchanger group is defrosted, the air pipe and the first heat exchanger group are in communication with the exhaust port, and the second heat exchanger group is in communication with the suction port;

When the second heat exchanger group is defrosted, the air pipe and the second heat exchanger group are in communication with the exhaust port, and the first heat exchanger group is in communication with the suction port;

During cooling, the first heat exchanger group and the second heat exchanger group are in communication with the exhaust port, and the air pipe is in communication with the suction port;

When heating, the first heat exchanger group and the second heat exchanger group are in communication with the suction port, and the air pipe is in communication with the exhaust port;

The control method includes:

Determining a working mode of the air conditioning system, wherein the working mode includes a cooling mode, a heating mode, a first heat exchanger group defrosting mode, and a second heat exchanger group defrosting mode;

When the working mode is the first heat exchanger group defrosting mode or the second heat exchanger group defrosting mode, the opening degree of the first throttling device is adjusted according to a preset condition.
The control method according to claim 1, wherein the air conditioning system further comprises a first pressure sensor, and the first pressure sensor is provided between the first throttling device and the first reversing device , Said adjusting the first throttling device according to a preset condition specifically includes:

Determine the target condensing pressure;

Acquiring the real-time pressure of the refrigerant flowing into the first reversing device;

The size of the condensing pressure is compared with the real-time pressure, and the opening degree of the first throttle device is adjusted according to the comparison result.
The control method according to claim 2, wherein the air conditioning system further comprises a second pressure sensor provided at the exhaust port, and the second pressure sensor is used to detect the refrigerant at the exhaust port Pressure, the determination of the target condensing pressure specifically includes:

Obtaining the exhaust pressure at the exhaust port;

According to the exhaust pressure, the target condensing pressure is determined.
The control method according to claim 2, wherein the adjusting the opening degree of the first throttling device according to the comparison result specifically comprises:

When the real-time pressure is less than the condensing pressure, increase the opening of the first throttling device;

When the real-time pressure is greater than the condensing pressure, the opening degree of the first throttling device is reduced.
The control method according to claim 2, wherein the air conditioning system further comprises a second throttling device, a third throttling device, and a fourth throttling device;

The second throttling device is arranged between the first heat exchanger group and the liquid pipe;

The third throttling device is arranged between the second heat exchanger group and the liquid pipe;

One end of the fourth throttling device is connected between the first heat exchanger group and the second throttling device, and the other end is connected to the second heat exchanger group and the third throttling device between;

The control method further includes:

When the working mode is the first heat exchanger group defrosting mode, the second throttling device is turned off, and the fourth throttling device is turned on;

When the working mode is the second heat exchanger group defrosting mode, the third throttling device is turned off, and the fourth throttling device is turned on;

When the working mode is the cooling mode or the heating mode, the fourth throttling device is turned off, and the second throttling device and the third throttling device are turned on.
An air conditioning system, characterized in that it comprises:

Compressor, first reversing device, second reversing device, first heat exchanger group, second heat exchanger group, gas pipe, liquid pipe, indoor unit, first throttling device and controller;

The discharge port of the compressor is simultaneously connected to the first reversing device and the second reversing device, and the suction port of the compressor is simultaneously connected to the first reversing device and the second reversing device. Connect to the device;

Both ends of the air pipe are respectively connected to the second reversing device and the indoor unit;

One end of the first heat exchanger group is in communication with the first reversing device, and the other end is in communication with the indoor unit through the liquid pipe;

One end of the second heat exchanger group is in communication with the first reversing device, and the other end is in communication with the indoor unit through the liquid pipe;

The first throttling device is provided between the first reversing device and the exhaust port, and is used to adjust the flow rate of the refrigerant flowing into the first reversing device;

The first reversing device and the second reversing device are configured as:

When the first heat exchanger group is defrosted, the first heat exchanger group is in communication with the exhaust port, and the second heat exchanger group is in communication with the suction port;

When the second heat exchanger group is defrosted, the second heat exchanger group is in communication with the exhaust port, and the first heat exchanger group is in communication with the suction port;

During cooling, the first heat exchanger group and the second heat exchanger group are in communication with the exhaust port, and the air pipe is in communication with the suction port;

When heating, the first heat exchanger group and the second heat exchanger group are in communication with the suction port, and the air pipe is in communication with the exhaust port;

The controller is in communication connection with the first throttling device.
The air conditioning system according to claim 6, further comprising:

The first pressure sensor is arranged between the first throttling device and the first reversing device, and the first pressure sensor is communicatively connected with the controller.
The air conditioning system according to claim 7, further comprising:

A second pressure sensor arranged at the exhaust port, the second pressure sensor is communicatively connected with the controller and used for detecting the refrigerant pressure of the exhaust port.
The air conditioning system according to claim 7, further comprising:

A second throttling device, a third throttling device, and a fourth throttling device that are all communicatively connected with the controller;

The second throttling device is arranged between the first heat exchanger group and the liquid pipe;

The third throttling device is arranged between the second heat exchanger group and the liquid pipe;

One end of the fourth throttling device is connected between the first heat exchanger group and the second throttling device, and the other end is connected to the second heat exchanger group and the third throttling device between.
The air conditioning system according to any one of claims 6 to 9, further comprising:

A low-pressure air pipe connected with the suction port;

The indoor unit includes a valve box and an indoor heat exchanger connected to the valve box, and the air pipe, the liquid pipe, and the low-pressure air pipe are in communication with the valve box.