WO2021223769A1

WO2021223769A1 - Air conditioning system and control method therefor, and control apparatus

Info

Publication number: WO2021223769A1
Application number: PCT/CN2021/094617
Authority: WO
Inventors: 荣丹; 宋强; 刘江彬; 刘景升; 任滔; 孟庆良; 谭雪艳
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: 2020-05-26
Filing date: 2021-05-19
Publication date: 2021-11-11
Also published as: CN111623549B; CN111623549A

Abstract

An air conditioning system and a control method therefor, and a control apparatus. The air conditioning system comprises a compressor (1), an indoor heat exchanger (3), an outdoor heat exchanger (2), and an electromagnetic four-way reversing valve (5); the first side and the second side in a valve body of the electromagnetic four-way reversing valve (5) generate a pressure difference capable of enabling the electromagnetic four-way reversing valve (5) to achieve reversing; the air conditioning system is further provided with a gas supplementing portion (6); the gas supplementing portion (6) comprises: a gas supplementing apparatus (61), capable of releasing a gas to the first side and/or the second side, so as to promote reversing of the electromagnetic four-way reversing valve (5) by means of releasing the gas to the same side as a gaseous refrigerant on the basis that the compressor releases the gaseous refrigerant to the first side and/or the second side. By means of the provision of the gas supplementing portion (6), it is ensured that mode switching of the air conditioning system can be reliably achieved.

Description

Air conditioning system and its control method and control device

Technical field

The present invention relates to the field of air treatment technology, in particular to an air conditioning system and its control method and control device.

Background technique

Air conditioners usually have a cooling mode and a heating mode. The refrigerant can be circulated in the circuit formed by the compressor-condenser-throttling component (for example, an electronic expansion valve or capillary tube, etc.)-evaporator-compressor. The space provides cold or heat, thereby lowering or raising the temperature of the indoor space. The switching between cooling mode and heating mode is accomplished by switching the four-way valve. Specifically, the flow path of the refrigerant in the circuit is switched by the four-way valve, so that when the air conditioner is in the cooling mode, the indoor heat exchanger is the evaporator and the outdoor heat exchanger is the condenser, and when the air conditioner is in the heating mode At that time, the indoor heat exchanger is a condenser and the outdoor heat exchanger is an evaporator.

When the four-way valve is an electromagnetic four-way reversing valve, such a problem may occur: due to insufficient pressure difference between the high and low pressure sides, the four-way valve cannot be effectively switched, that is, the cooling mode and the heating mode cannot be switched. Is reliably switched, resulting in the product stability of the air conditioner cannot be guaranteed.

Correspondingly, a new technical solution is needed in this field to solve the above-mentioned problems.

Summary of the invention

technical problem

In view of this, the technical problem to be solved by the present invention is to provide an air-conditioning system and its control method and control device that can compensate the commutation pressure difference to ensure product stability.

solution

The first aspect of the present invention provides an air conditioning system, which includes a compressor, an indoor heat exchanger, an outdoor heat exchanger, and an electromagnetic four-way reversing valve, wherein the valve body of the electromagnetic four-way reversing valve The first side and the second side produce a pressure difference capable of reversing the electromagnetic four-way reversing valve, so that when the electromagnetic four-way reversing valve is reversed, the refrigerant is in the compressor, A circulation path corresponding to a cooling mode and a heating mode is formed between the indoor heat exchanger and the outdoor heat exchanger, wherein the air conditioning system is equipped with an air supplement part, and the air supplement part includes: an air supplement device , Which can dispense gas, and the gas supplement device is arranged on the first side and/or the second side so as to: Based on this, the electromagnetic four-way reversing valve is promoted to be reversed by distributing gas to the same side as the distributing gaseous refrigerant.

With such an arrangement, it is possible to achieve the reversal of the electromagnetic four-way reversing valve reliably with the aid of an additional driving force. Specifically, in the present invention, the electromagnetic four-way reversing valve is equipped with an air supplement device, and the auxiliary intervention of external pressure is used to ensure that the electromagnetic four-way reversing valve obtains the pressure difference required for reversing, thereby ensuring the electromagnetic four-way reversing valve. The direction valve can reliably realize the direction change, thereby ensuring the product stability of the air-conditioning system.

It can be understood that the first side and the second side may be respectively equipped with a supplementary air device, or the first side and the second side may be respectively equipped with the same supplementary air device. When the air conditioning system requires mode switching, one of the first side and the second side must be the high-pressure side and the other is the low-pressure side. At this time, when the supplemental air device is respectively configured, only the supplemental corresponding to the high-pressure side is turned on. The gas device can deliver gas to the high-pressure side. In the case of configuring the same gas supplement device, the gas supplement device can discharge gas to the high-pressure side by switching the gas path.

In addition, the form and location of the air supplement device can also be flexibly adjusted according to the actual situation. For example, the air supplement device is a component that is externally connected to the outdoor unit, such as placed or fixed on the outside of the outdoor unit, and introduces gas into the aforementioned first side or second side through a separate pipeline, or it can be: air supplement The device is installed inside the outdoor unit, for example, a corresponding installation position is reserved in the outdoor unit, and the air supplement device is installed in the installation position.

The method of introducing gas into the aforementioned first side or second side is usually: a valve (such as a solenoid valve) is arranged on the pipeline, and air can be supplied to the first side or the second side by controlling the opening and closing of the valve. On the premise that the valve can meet the requirement of allowing or blocking air supplement, the number and setting position of the valve can also be flexibly selected according to the actual situation. If the air supplement device is connected to a position near the first side or the second side of the refrigerant circuit through a pipeline, only one valve can be arranged on the pipeline, and it can be completed by opening and closing a valve, or it can be installed in the pipeline and near the first side. The refrigerant circuit at the side or the second side is equipped with a valve respectively, which is completed by the cooperation of the two valves.

It should be noted that, since the effective function of the gas released by the air supplement device is to ensure that the electromagnetic four-way reversing valve can reliably achieve reversal, the type of gas can be the same as or different from that of the refrigerant. Taking the same gas as the refrigerant as an example, because the amount of gas involved in supplemental gas is small and the supplementary time is shorter, even if the refrigerant circuit is additionally added to the compressor's exhaust port, the refrigerant quality may not be The same refrigerant has less impact on the operation of the entire air conditioning system.

Still taking the same gas and refrigerant as an example, in order to better ensure the performance of the air conditioning system, the air supplement device can be improved as follows: after the gas is distributed to the high pressure side, the same amount of gas is recovered from the low pressure side. Take the same gas supplement device on the first side and the second side as an example. For example, two pipelines can be configured on the gas supplement device, one is the gas distribution pipeline, the other is the gas recovery pipeline, and the distribution pipeline The valve and the recovery pipeline are respectively equipped with valves. For example, at the same time or after the electromagnetic four-way reversing valve realizes the reversal, the valve of the recovery pipeline can be opened to recover the same amount of gas as the discharged gas.

For the above air conditioning system, in a possible implementation manner, the air supplement device is connected to the first side and the second side respectively.

With this arrangement, it is possible to better achieve the reversal of the electromagnetic four-way reversing valve during mode switching. For example, the high-pressure side of the first side and the second side can perform the operation of distributing gas, and the low-pressure side can perform the operation of recovering gas.

In addition, the same air-supplementing device is used to perform air-supplement operations on both sides of the electromagnetic four-way reversing valve, which is convenient for controlling the air conditioning system. In addition, this arrangement makes the structure of the air conditioning system more compact.

For the above air conditioning system, in a possible implementation manner, the air supplement part further includes: a heating device, which is used to heat the air supplement device so as to be directed to the first side and/or the first side and/or the second side. The gas whose pressure has been increased is delivered on both sides.

With this arrangement, it is possible to reliably realize the reversal of the electromagnetic four-way reversing valve during mode switching without increasing the supplemental air volume.

It is understandable that the specific form of the heating device and its arrangement in the air supplement device can also be flexibly selected according to the actual situation. Heating plate, etc.

For the above air conditioning system, in a possible implementation manner, the compressor is a magnetic levitation centrifugal compressor or an air levitation centrifugal compressor.

The design pressure ratio of magnetic levitation centrifugal compressor and air levitation centrifugal compressor cannot be increased due to their own structural characteristics. Therefore, when the air supplement device is applied to an air-conditioning system with a magnetic levitation centrifugal compressor or an air suspension centrifugal compressor, it can be more obvious that the reversal of the electromagnetic four-way reversing valve with the assistance of the air supplement device is in the mode switching. An effect that is reliably achieved.

Specifically, a turbo compressor is a compressor that is driven by a driver to rotate at a high speed by an impeller with blades mounted on a shaft. According to the different gas flow directions, turbocompressors are mainly divided into axial turbocompressors and centrifugal turbocompressors. Centrifugal turbocompressors include magnetic levitation centrifugal compressors and air levitation centrifugal compressors. For turbo compressors, when the flow is reduced to a certain extent, the flow and pressure of the gas in the compressor and pipeline will have periodic low-frequency/large-amplitude fluctuations, which will cause the unit to produce strong vibrations. This kind of vibration is especially harmful to magnetic levitation centrifugal compressors and air levitation centrifugal compressors. Therefore, the design pressure ratio of magnetic levitation centrifugal compressor and air levitation centrifugal compressor is usually small.

The second aspect of the present invention provides a control method of an air-conditioning system, the air-conditioning system includes a compressor, an indoor heat exchanger, an outdoor heat exchanger and an electromagnetic four-way reversing valve, wherein the electromagnetic four-way reversing valve The first side and the second side of the valve body generate a target pressure difference that enables the electromagnetic four-way reversing valve to achieve reversal, and the air conditioning system is configured to be able to deliver to the first side and the second side A gas supplement device, the control method includes: in the case that the air-conditioning system requires the electromagnetic four-way reversing valve to change direction, acquiring the first current pressure on the first side and the second pressure on the second side Current pressure; compare the first current pressure and the second current pressure; according to the comparison result, selectively cause the air supplement device to dispense to the high pressure side of the first side and the second side gas.

With such an arrangement, the reversal of the electromagnetic four-way reversing valve can be reliably achieved by means of the additional driving force provided.

Just as an air supplement device is connected to the first side and the second side through the first pipeline and the second pipeline, respectively, (first and second) valves (such as electromagnetic Valves), (first and second) pressure detection components (such as pressure sensors) are respectively arranged at positions corresponding to the first side and the second side. The pressure value of the corresponding side is obtained through the pressure sensor, and the relationship between the pressure values on both sides (such as difference, ratio, etc.) can ensure that the electromagnetic four-way reversing valve can be switched by the switch state of the valve. To realize the release of gas, in the case that the electromagnetic four-way reversing valve is switched, the gas is blocked by switching the on-off state of the valve or the gas is blocked after recovery.

Obviously, the sensing end of the (first and second) pressure sensors should be located at a position capable of sensing the pressure on the first side and the second side. Under the premise that this condition is met, those skilled in the art can flexibly choose (first , Second) The specific form and installation method of the pressure sensor, such as the (first and second) pressure sensor can be directly installed on the electromagnetic four-way reversing valve, or the outdoor unit can be installed on the electromagnetic four-way reversing valve. The positions of the first side and the second side are reserved for installation positions, and the (first and second) pressure sensors are arranged in the corresponding installation positions.

Regarding the above control method, in a possible implementation, the "according to the comparison result, selectively causing the air supplement device to dispense to the high pressure side of the first side and the second side "Gas" includes: in the case that the current pressure difference between the first current pressure and the second current pressure is less than or equal to the target pressure difference, causing the air supplement device to move toward the first side and the second side. The high-pressure side of the side emits gas.

Taking the current pressure of the first side greater than the current pressure of the second side as an example, in the case of the difference between the two, that is, when the current pressure difference is greater than the set pressure, the reversal of the electromagnetic four-way reversing valve can be realized theoretically Reliable commutation. In order to ensure the realization of commutation, theoretically speaking, the reliable realization of commutation can be satisfied when the target pressure difference is equal to the set pressure. However, in practice, in order to ensure more reliable commutation control of the electromagnetic four-way reversing valve, the target pressure difference is usually set to a value slightly greater than the set pressure, such as multiplying the set pressure by a safety factor s, such as The safety factor s can be selected between 1-1.3, such as 1.1.

Regarding the above control method, in a possible implementation manner, the first side and the second side are respectively equipped with a first valve and a second valve, and the "selectively use the valve according to the comparison result" The gas supplement device discharging gas to the high-pressure side of the first side and the second side" includes: when gas needs to be dispensed to the high-pressure side, making the gas corresponding to the first side and the second side The valve on the high-pressure side of the first side is opened; the opening degree of the valve on the high-pressure side corresponding to the first side and the second side is adjusted according to the current pressure difference; and/or the “according to the comparison result, "Selectively causing the gas supplement device to dispense gas to the high-pressure side of the first side and the second side" includes: in the case of a need to dispense gas to the high-pressure side, making the gas supplement device to the Set the duration of gas distribution on the high-pressure side.

By adjusting the valve opening to control the amount of supplemental air, it is possible to more closely seek the reversal of the electromagnetic four-way reversing valve to be reliably realized according to the actual supplemental demand.

Through the control of the operating time, the reversal of the electromagnetic four-way reversing valve can be realized more reliably in a more timely manner according to the actual air supplement demand.

Specifically, under normal circumstances, it takes about 10-40 seconds from the time the air-conditioning system receives the switching command of the operating mode to the four-way valve completing the switching action corresponding to the switching command. Based on this premise, after the inventor’s experiment and analysis, in order to ensure that the electromagnetic four-way reversing valve can complete the switching action in accordance with the requirements of the air conditioning system with the assistance of the air supplement device, the set time should be somewhere between 1-10s Value (preferably 3s). When the set duration is within this range, on the one hand, it can ensure that the switching action can be realized in a timely and reliable manner, on the other hand, it can avoid excessive compensation refrigerant used to assist in switching. Enter the air-conditioning system, thereby affecting the initial performance of the air-conditioning system after the mode switch.

It is understandable that under the premise of duration control, a fixed valve opening can be maintained or the valve opening can be adjusted at the same time according to the actual situation, or the solenoid four-way reversing valve can be ensured by combining the valve opening and the gas delivery time. The commutation is reliably realized when the mode is switched.

Regarding the above control method, in a possible implementation manner, the air conditioning system further includes a heating device capable of heating the air supplement device, and the "selectively make the air supplement device according to the comparison result The "device discharging gas to the high-pressure side of the first side and the second side" includes: operating the heating device when gas needs to be dispensed to the high-pressure side.

With such an arrangement, it is possible to achieve more reliable reversal of the electromagnetic four-way reversing valve with a smaller amount of gas delivery through auxiliary heating according to the actual supplemental gas demand.

It is understandable that the opening time of the heating device can be synchronized or not synchronized with the gas dispensing process. The heating time and the gas dispensing time can be the same or different. Those skilled in the art can flexibly adjust the activation timing and compensation of the heating device according to the actual situation. The relationship between the action process of the air device. For example, the air supplement device and the heating device are always synchronized.

A third aspect of the present invention provides a control device, the control device comprising a control module, wherein the control module is used to execute the control method of the air conditioner described in any one of the foregoing.

It is understandable that the air-conditioning system has all the technical effects of the aforementioned control method of the air-conditioning system, which will not be repeated here.

A fourth aspect of the present invention provides a control device. The control device includes a memory and a processor, wherein the memory is adapted to store multiple pieces of program code, and the processor can call the program code and execute the foregoing Any one of the control methods of the air conditioning system.

It is understandable that the control device has all the technical effects of the aforementioned control method of the air-conditioning system, which will not be repeated here.

Description of the drawings

Hereinafter, the present invention will be described in conjunction with the cooling mode and the heating mode with reference to the drawings. In the attached picture:

Figure 1 shows the schematic diagram of the electromagnetic four-way reversing valve when it is switched to the cooling mode;

Figure 2 shows a schematic diagram of the principle of the electromagnetic four-way reversing valve when it is switched to the heating mode;

Figure 3 shows a schematic diagram of the switching principle of the electromagnetic four-way reversing valve;

4 shows a schematic diagram of the principle of the air conditioning system when switching to a cooling mode according to an embodiment of the present invention;

FIG. 5 shows a schematic diagram of the principle of the air conditioning system when switching to the heating mode according to an embodiment of the present invention; and

Fig. 6 shows a schematic flow chart of a control method of an air conditioning system according to an embodiment of the present invention.

List of reference signs:

1. Compressor; 2. Outdoor heat exchanger; 3. Indoor heat exchanger; 4. Electronic expansion valve; 5. Electromagnetic four-way reversing valve; 51, pilot valve; 511, pilot slide valve; 512, compression spring; 52. Main valve; 520. Main slide valve; 521. First chamber; 522. Second chamber; 53, Capillary tube; Pipeline; 72, the second pipeline; 81, the first solenoid valve; 82, the second solenoid valve; 91, the first pressure sensor; 92, the second pressure sensor.

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 this embodiment uses the compressor as a magnetic levitation centrifugal compressor, and the electromagnetic four-way reversing valve as a slide valve, it is obvious that the compressor can also be an air levitation centrifugal compressor or other types of compressors, The electromagnetic four-way reversing valve can also be a ball valve.

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" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance.

1 to 3, Figure 1 shows the schematic diagram of the electromagnetic four-way reversing valve when switching to cooling mode, Figure 2 shows the schematic diagram of the electromagnetic four-way reversing valve when switching to heating mode, Figure 3 Shows the schematic diagram of the switching principle of the electromagnetic four-way reversing valve. As shown in Figures 1 to 3, the air conditioning system includes a compressor 1, an outdoor unit equipped with an outdoor heat exchanger 2, an indoor unit equipped with an indoor heat exchanger 3, an electronic expansion valve 4, and an electromagnetic four-way reversing valve 5. , The electromagnetic four-way reversing valve 5 mainly includes a pilot valve 51, a main valve 52 and a capillary tube 53. Specifically, both the pilot valve 51 and the main valve 52 have (C, D, E, S) tubes, and the corresponding tubes are communicated with each other through a capillary tube 53. Wherein, a pilot valve chamber is formed in the valve body of the pilot valve, a pilot spool valve 511 is arranged in the pilot valve chamber, and a compression spring 512 is arranged between the pilot spool valve and the right side wall of the pilot valve chamber. A main valve chamber is formed in the valve body of the main valve, and a main slide valve 520 is arranged in the main valve chamber. Driven by the pilot valve, a pressure difference is generated on both sides (left and right) of the main slide valve, thereby creating a pressure difference in the main valve chamber. Displacement occurs in the left and right directions. With the displacement, chambers (521, 522) are formed between the main slide valve and the left and right sides of the chamber respectively. When the volume distribution of the chambers (521, 522) meets the standard, the corresponding displacement can realize the reversal, thereby realizing the change of the flow direction of the refrigerant.

1 and 3, when the solenoid coil is in the de-energized state, the pilot slide valve moves to the left under the drive of the compression spring, and the high-pressure gas enters the first chamber 521 on the right after passing through the capillary tube corresponding to the C tube, and the main slide valve The valve moves to the left due to the pressure difference between the left and right ends due to the gas entering the first chamber 521. As the left movement progresses, the gas is discharged and moves to the left of the main slide valve to the volume distribution of the chambers (521, 522) When the conditions for the (C, D) tube to be turned on and the (E, S) tube to be turned on are met, the air conditioning system can be switched to the cooling mode.

2 and 3, the solenoid is in the energized state so that the pilot slide valve moves to the right under the magnetic force generated by the solenoid to overcome the tension of the compression spring, and the high-pressure gas enters the second left side after passing through the capillary corresponding to the E tube. In the chamber 522, the main slide valve moves to the right due to the pressure difference between the left and right ends due to the gas entering the second chamber 522. As the right shift progresses, the gas is discharged, and the main slide valve moves to the right of the chamber (521 When the volume distribution of 522) meets the conditions that the (C, S) tube is connected and the (D, E) tube is connected, the air conditioning system can be switched to the heating mode.

The basic condition for the reversing of the electromagnetic four-way reversing valve is that the pressure difference between the two ends of the main spool valve must be greater than the friction between the main spool valve and the valve body, otherwise the main spool valve will not slide and the refrigerant will not be accompanied by reversing. And the resulting path changes. The pressure difference required for reversing is guaranteed by the refrigerant flow rate discharged from the compressor exhaust port of the air conditioning system, that is, the compressor’s exhaust flow rate Q _I. When the pressure difference is greater than the friction, the electromagnetic four-way reversing valve The commutation process begins. Referring to Figure 3, when the main slide valve moves to the intermediate position, the (E, S, C) pipes of the electromagnetic four-way reversing valve are connected to each other, and the gaseous refrigerant discharged from the exhaust port of the compressor is switched from the electromagnetic four-way valve. The valve D takes over and flows directly through the (E, C) pipe to the S pipe connected to the suction port of the compressor, so that the pressure difference is quickly reduced to form an instantaneous gas flow state. At this time, the refrigerant flow in the (E, S, C) pipe _{It is the intermediate flow Q M} of the electromagnetic four-way reversing valve. At this time, if the exhaust flow Q _{I of the} compressor is much larger than the intermediate flow Q _{M of the} electromagnetic four-way reversing valve, a large enough reversing pressure difference can be established to make the electromagnetic four-way reversing valve in place. Conversely, if the discharge flow of the compressor is less than the intermediate flow rate of the electromagnetic four-way reversing valve, the minimum operating pressure difference required for the electromagnetic four-way reversing valve to achieve reversing cannot be established, and the electromagnetic four-way reversing valve cannot be achieved. Reversing, the main slide valve continues to stay in the middle position to form a gas stream.

In order to ensure that the reversal of the electromagnetic four-way reversing valve can be realized, the pressure difference is greater than the frictional force is a condition that must be met. In order to ensure that the commutation is reliably performed, the pressure difference can be made greater than a certain value greater than the frictional force. As mentioned above, it is possible to multiply the friction force as the set pressure by a safety factor, for example, to ensure that the commutation is reliably performed by satisfying the friction force with a pressure difference greater than 1.1 times.

The present invention aims to increase the compressor discharge flow Q _I by means of reversing pressure difference compensation, so as to ensure that the current pressure difference between the two ends of the main slide valve can make the reversing of the electromagnetic four-way reversing valve reliable conduct.

4 and 5, FIG. 4 shows a schematic diagram of the principle of the air-conditioning system when switching to the cooling mode according to an embodiment of the present invention, and FIG. 5 shows the schematic diagram of the air-conditioning system when switching to the heating mode according to an embodiment of the present invention. Schematic diagram of the principle. As shown in Figures 4 and 5, the air conditioning system includes a compressor 1, an outdoor heat exchanger 2, an indoor heat exchanger 3, an electronic expansion valve 4, and an electromagnetic four-way reversing valve 5. The electromagnetic four-way reversing valve 5 has ( C, D, E, S) tube, when the (C, D) tube is connected, and the (E, S) tube is connected, the air conditioning system switches to the cooling mode. When the (C, S) tube is turned on and the (D, E) tube is turned on, the air-conditioning system switches to the heating mode. The air supplement part 6 includes an air supplement device 61 that can deliver gas consistent with the refrigerant, and the air supplement device has a two-way power source, that is, it can not only deliver gas to the refrigerant pipeline of the air conditioning system, but also from the air conditioning system. Gas is recovered in the refrigerant pipeline. The air supplement device 61 is equipped with a heating device 62, and the heating device is a heating tube coiled around the outer wall of the air supplement device. The air supplement device 61 is connected to the D pipe and the S pipe through the first pipe 71 and the second pipe 72 respectively. The D pipe is connected to the discharge port of the compressor, the S pipe is connected to the suction port of the compressor, and the first pipe The first solenoid valve 81 and the second solenoid valve 82 are respectively provided on the path 71 and the second pipe 72. The positions near the S tube and the D tube in the refrigerant circuit are respectively provided for detecting the discharge pressure and suction of the compressor. The first pressure sensor 91 and the second pressure sensor 92 of air pressure.

The air-conditioning system includes a control module. Based on the structure of the above-mentioned air-conditioning system and the piping (71, 72), solenoid valves (81, 82) and pressure sensors (91, 92) of the air-conditioning system, the air-conditioning system can be controlled by the control module. The following control method is used to ensure the reliable commutation of the electromagnetic four-way reversing valve when the air conditioning system needs to switch between the cooling mode and the heating mode.

In the description of the present invention, "control module" and "processor" may include hardware, software, or a combination of both. A module can include hardware circuits, various suitable sensors, communication ports, and memory, and can also include software parts, such as program codes, or a combination of software and hardware. The processor may be a central processing unit, a microprocessor, an image processor, a digital signal processor, or any other suitable processor. The processor has data and/or signal processing functions. The processor can be implemented in software, hardware, or a combination of the two. The non-transitory computer-readable storage medium includes any suitable medium that can store program code, such as magnetic disks, hard disks, optical disks, flash memory, read-only memory, random access memory, and so on.

Those skilled in the art can understand that all or part of the process in the method of the above-mentioned embodiment of the present invention can also be completed by instructing relevant hardware through a computer program, and the computer program can be stored in a computer readable In the storage medium, when the computer program is executed by the processor, the steps of the foregoing method embodiments can be implemented. Wherein, the computer program includes computer program code, and the computer program code may be in the form of source code, object code, executable file, or some intermediate forms. The computer-readable medium may include: any entity or device, medium, U disk, mobile hard disk, magnetic disk, optical disk, computer memory, read-only memory, random access memory, and electrical carrier signal that can carry the computer program code. , Telecommunications signals and software distribution media, etc. It should be noted that the content contained in the computer-readable medium can be appropriately added or deleted according to the requirements of the legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to the legislation and patent practice, the computer-readable medium Does not include electrical carrier signals and telecommunication signals.

Further, it should be understood that since the setting of the control module is only to illustrate the functional units of the system of the present invention, the physical device corresponding to the control module may be the processor itself, or a part of the software or hardware in the processor. Or part of the combination of software and hardware. Therefore, the number of control modules is only illustrative.

Those skilled in the art can understand that the control module can be adaptively split. The specific disassembly of the control module will not cause the technical solution to deviate from the principle of the present invention. Therefore, the technical solutions after the disassembly will fall within the protection scope of the present invention.

Referring to FIG. 6, FIG. 6 shows a schematic flowchart of a control method of an air conditioning system according to an embodiment of the present invention. As shown in Figure 6, the control method of the air conditioning system includes the following steps:

When the air conditioning system needs mode switching, the electromagnetic four-way reversing valve needs to change the refrigerant circuit corresponding to the mode by reversing, and obtain the first current pressure (low pressure side) through the first pressure sensor and the second pressure sensor respectively. And the second current pressure (high pressure side);

When the pressure difference between the second current pressure and the first current pressure is sufficient to enable the main slide valve to be reliably moved to realize the reversal of the electromagnetic four-way reversing valve, the air supplement device is not activated (first, second) The solenoid valve remains closed, that is, the air supplement device does not release gas to the D tube.

In the case that the pressure difference between the second current pressure and the first current pressure is less than the target pressure difference to ensure reliable reversing of the electromagnetic four-way reversing valve, the air supplement device is activated, the second solenoid valve is opened, and the air supplement device is directed to the D pipe Distribute gas from place to place until the reversal is achieved.

At the same time or after the reversal is realized, the first solenoid valve is opened, and the gas that is approximately equal to the amount of the discharged gas is recovered from the S tube to the gas supplement device.

It is understandable that the timing of opening the (first and second) solenoid valves can be flexibly selected according to actual conditions.

In a possible implementation, in order to meet the actual gas distribution requirements, the heating device can heat the air supplement device, so that the gas with increased pressure can be distributed to the refrigerant circuit of the air conditioning system. As the pressure of the gas is increased, the amount of gas released is correspondingly reduced, and the amount of gas recovery is therefore less, and the gas recovery step can even be omitted.

In a possible implementation, in order to meet the actual gas distribution requirements, the opening degree of the (first and second) solenoid valves can be adjusted.

In a possible implementation, in order to meet the actual gas distribution requirements, the opening time of the (first and second) solenoid valves can be adjusted.

It should be pointed out that although the various steps are described in a specific sequence in the above embodiments, those skilled in the art can understand that in order to achieve the effects of the present invention, different steps do not have to be executed in this order. It can be executed at the same time (in parallel) or in other order (such as adjusting the opening of the solenoid valve in time periods within the opening time of the solenoid valve, etc.), or some steps can be omitted (such as no gas recovery, etc.) ), these changes are all within the protection scope of the present invention.

It should be noted that, although the control method constructed in the above specific manner is taken as an example for introduction, those skilled in the art can understand that the present invention should not be limited to this. In fact, users can flexibly adjust related steps, parameters in steps and other elements according to actual application scenarios and other situations.

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

An air-conditioning system, characterized in that the air-conditioning system includes a compressor, an indoor heat exchanger, an outdoor heat exchanger and an electromagnetic four-way reversing valve, wherein the first in the valve body of the electromagnetic four-way reversing valve The side and the second side generate a pressure difference capable of reversing the electromagnetic four-way reversing valve, so that when the electromagnetic four-way reversing valve is reversed, the refrigerant is in the compressor and the indoor A circulation path corresponding to the cooling mode and the heating mode is formed between the heat exchanger and the outdoor heat exchanger,

Wherein, the air conditioning system is equipped with an air supplement part, and the air supplement part includes:

A supplemental gas device, which can dispense gas, and the supplemental gas device is arranged on the first side and/or the second side, so as to:

On the basis of the compressor distributing gaseous refrigerant to the first side and/or the second side, the electromagnetic four-way reversing valve is promoted to be replaced by distributing gas to the same side as the distributing gaseous refrigerant. Towards.
The air conditioning system according to claim 1, wherein the supplemental air device is connected to the first side and the second side, respectively.
The air conditioning system according to claim 1 or 2, wherein the supplemental air part further comprises:

The heating device is used for heating the gas supplement device so as to release the gas whose pressure has been increased to the first side and/or the second side.
The air conditioning system according to claim 3, wherein the compressor is a magnetic levitation centrifugal compressor or an air levitation centrifugal compressor.
A control method of an air conditioning system, characterized in that the air conditioning system includes a compressor, an indoor heat exchanger, an outdoor heat exchanger and an electromagnetic four-way reversing valve, wherein the valve body of the electromagnetic four-way reversing valve The first side and the second side generate a target pressure difference that enables the electromagnetic four-way reversing valve to achieve reversal, and the air conditioning system is equipped with a compensation that can release gas to the first side and the second side Gas device,

The control method includes:

In the case where the air conditioning system requires the electromagnetic four-way reversing valve to change direction, acquiring the first current pressure on the first side and the second current pressure on the second side;

Comparing the first current pressure and the second current pressure;

According to the comparison result, the gas supplement device is selectively caused to dispense gas to the high-pressure side of the first side and the second side.
The control method according to claim 5, wherein the “according to the comparison result, the supplemental gas device is selectively issued to the high-pressure side of the first side and the second side. "Gas" includes:

In the case that the current pressure difference between the first current pressure and the second current pressure is less than or equal to the target pressure difference, the air-supplementing device is turned to the high pressure in the first side and the second side Distribute gas from the side.
The control method according to claim 5 or 6, characterized in that the first side and the second side are respectively equipped with a first valve and a second valve, and the “selectively based on the comparison result” The "really causing the gas supplement device to issue gas to the high-pressure side of the first side and the second side" includes:

In the case of the need to dispense gas to the high-pressure side, open the valves on the high-pressure side corresponding to the first side and the second side;

Adjusting the opening degrees of the valves on the high pressure side corresponding to the first side and the second side according to the current pressure difference;

And/or

The “selectively causing the gas supplement device to dispense gas to the high-pressure side of the first side and the second side according to the comparison result” includes:

In the case of the need to dispense gas to the high-pressure side, the gas supplement device is made to dispense the gas to the high-pressure side for a set period of time.
The control method according to claim 5, wherein the air-conditioning system further comprises a heating device capable of heating the supplemental air device, and the "selectively make the supplemental air according to the comparison result The device discharging gas to the high-pressure side of the first side and the second side" includes:

In the case of the need to dispense gas to the high-pressure side, the heating device is operated.
A control device, characterized in that the control device includes a control module,

Wherein, the control module is used to execute the control method of the air conditioning system according to any one of claims 5 to 8.
A control device, characterized in that the control device includes a memory and a processor,

Wherein, the memory is suitable for storing multiple pieces of program codes,

Wherein, the processor can call the program code and execute the control method of the air conditioning system according to any one of claims 5 to 8.