Control method and device for heat exchange system, heat exchange system and storage medium

Abstract

The invention relates to the technical field of heat exchange systems, and discloses a control method for a heat exchange system.The heat exchange system comprises a refrigerant adjusting branch, a liquid storage end of the refrigerant adjusting branch is connected with a heat exchange loop located between a throttler and an indoor heat exchanger, and an air supply end of the refrigerant adjusting branch is connected with an air return opening of a compressor; the refrigerant adjusting branch comprises a liquid storage device; the first control valve is arranged at the liquid storage end of the refrigerant adjusting branch; the second control valve is arranged at the air supply end of the refrigerant adjusting branch; the control method comprises the steps that the operation frequency of the compressor is obtained; under the condition that the operation frequency of the compressor is larger than or equal to a first frequency threshold value, the air supply requirement is determined according to the exhaust temperature of the compressor or the temperature of an evaporation coil; under the condition that the air supply requirement exists, the first control valve is controlled to be opened to the first opening degree; and after the first time interval, the second control valve is controlled to be opened to the second opening degree. And the air supply accuracy can be improved. The invention further discloses a control device for the heat exchange system, the heat exchange system and a storage medium.

Description

Technical Field

[0001] The present application relates to the technical field of heat exchange systems, for example, to a control method, a control device, a heat exchange system and a storage medium for a heat exchange system. Background Art

[0002] The air conditioner forms a refrigerant circulation loop with a certain flow rate through the setting of compressor and heat exchanger to achieve heat exchange, thereby adjusting the ambient temperature. Due to the diversity of the working environment of the air conditioner, problems such as increased suction specific volume and increased pressure ratio may occur in actual application, causing a sharp decline in compressor performance and unsatisfactory air conditioner working effect.

[0003] A control method for a heat exchange system is disclosed in the related art. The heat exchange system includes: a compressor provided with an air supply port; and an air supply valve connected to the air supply port of the compressor and configured to supply air to the compressor. The control method includes: detecting the operating environment of the heat exchange system, and if the operating time of the compressor is greater than a time threshold, or the outdoor ambient temperature is less than an ambient temperature threshold, controlling the air supply valve to open to supply air.

[0004] In the process of implementing the embodiments of the present disclosure, it is found that there are at least the following problems in the related art:

[0005] The operating time of the compressor and the outdoor ambient temperature cannot accurately reflect the current operating requirements of the compressor. Therefore, it is difficult to accurately determine the time to start the air replenishment, resulting in the air replenishment process being unable to accurately meet the actual air replenishment needs of the compressor.

[0006] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present application, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Summary of the invention

[0007] In order to provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. The summary is not an extensive review, nor is it intended to identify key / critical components or delineate the scope of protection of these embodiments, but rather serves as a prelude to the detailed description that follows.

[0008] The embodiments of the present disclosure provide a control method, a control device, a heat exchange system and a storage medium for a heat exchange system, so as to more accurately determine the timing of starting air replenishment, thereby better meeting the actual needs of the compressor.

[0009] In some embodiments, the heat exchange system includes: a heat exchange circuit, including a compressor, an outdoor heat exchanger, a throttle and an indoor heat exchanger connected in sequence; a refrigerant regulating branch, a liquid storage end connected to the heat exchange circuit located between the throttle and the indoor heat exchanger, and an air supply end connected to the return air port of the compressor; wherein the refrigerant regulating branch includes: a liquid storage device, configured to store refrigerant; a first control valve, arranged at the liquid storage end of the refrigerant regulating branch, connected to the liquid storage port of the liquid storage device; a second control valve, arranged at the air supply end of the refrigerant regulating branch, connected to the air supply port of the liquid storage device; the control method includes: obtaining the operating frequency of the compressor; when the operating frequency of the compressor is greater than or equal to the first frequency threshold, determining the air supply demand according to the exhaust temperature of the compressor or the evaporator coil temperature; when there is an air supply demand, controlling the first control valve to open to a first opening degree; and, after a first time interval, controlling the second control valve to open to a second opening degree.

[0010] Optionally, the air replenishment demand is determined based on the exhaust temperature of the compressor or the evaporator coil temperature, including: when the operating frequency of the compressor is greater than or equal to a first frequency threshold and less than a second frequency threshold, the air replenishment demand is determined based on the exhaust temperature of the compressor; when the operating frequency of the compressor is greater than or equal to the second frequency threshold, the air replenishment demand is determined based on the evaporator coil temperature.

[0011] Optionally, determining the air supplement demand according to the exhaust gas temperature of the compressor includes: determining that there is an air supplement demand when the exhaust gas temperature is greater than a first exhaust gas temperature.

[0012] Optionally, determining the air replenishment requirement according to the exhaust temperature of the compressor further includes: when the exhaust temperature is less than or equal to the first exhaust temperature, determining the air replenishment requirement according to the operating frequency of the compressor.

[0013] Optionally, the air replenishment demand is determined based on the operating frequency of the compressor, including: when the operating frequency of the compressor is greater than a first frequency threshold and less than or equal to a second frequency threshold, determining that there is no air replenishment demand; when the operating frequency of the compressor is greater than the second frequency threshold, determining that there is an air replenishment demand.

[0014] Optionally, determining the air replenishment demand according to the evaporator coil temperature includes: determining that there is an air replenishment demand when the evaporator coil temperature is less than the coil temperature threshold; and determining that there is no air replenishment demand when the evaporator coil temperature is greater than or equal to the coil temperature threshold.

[0015] Optionally, after obtaining the operating frequency of the compressor, it also includes: when the operating frequency of the compressor is less than a first frequency threshold, determining the refrigerant demand during operation according to the operating frequency of the compressor; and adjusting the refrigerant storage capacity of the refrigerant regulating branch according to the refrigerant demand.

[0016] Optionally, the refrigerant demand during operation is determined based on the operating frequency of the compressor, including: when the operating frequency of the compressor is greater than a third frequency threshold, determining that the refrigerant demand is a first demand; when the operating frequency of the compressor is less than or equal to the third frequency threshold, determining that the refrigerant demand is less than the first demand; wherein the third frequency threshold is less than the first frequency threshold.

[0017] Optionally, the refrigerant reserve of the refrigerant regulating branch is adjusted according to the refrigerant demand, including: when the refrigerant demand is a first demand, controlling the first control valve and the second control valve to remain closed; when the refrigerant demand is less than the first demand, controlling the first control valve and the second control valve to open, and the opening degree of the first control valve is greater than the opening degree of the second control valve.

[0018] Optionally, controlling the first control valve and the second control valve to open includes: controlling the throttle not to throttle; and, after a first time interval, controlling the first control valve and the second control valve to open, and the opening of the first control valve is greater than the opening of the second control valve.

[0019] Optionally, when the operating frequency of the compressor is less than or equal to a third frequency threshold, determining that the demand for refrigerant is less than the first demand includes: when the operating frequency of the compressor is less than or equal to the third frequency threshold and greater than a fourth frequency threshold, determining that the demand for refrigerant is the second demand; when the operating frequency of the compressor is less than or equal to the fourth frequency threshold, determining that the demand for refrigerant is the third demand; wherein the first demand is greater than the second demand, and the second demand is greater than the third demand.

[0020] Optionally, controlling the first control valve and the second control valve to open includes: determining an opening time according to a demand for refrigerant; and controlling the second control valve to close after the opening time of the first control valve reaches the opening time.

[0021] Optionally, after the opening time of the first control valve reaches the opening time, the method further includes: controlling the first control valve to close.

[0022] Optionally, determining the turn-on time according to the refrigerant demand includes: when the refrigerant demand is the second demand, determining the turn-on time to be the first time; when the refrigerant demand is the third demand, determining the turn-on time to be the second time; wherein the first time is less than the second time.

[0023] In some embodiments, the control device includes a processor and a memory storing program instructions. The processor is configured to execute the above control method for the heat exchange system when running the program instructions.

[0024] In some embodiments, the heat exchange circuit includes a compressor, an outdoor heat exchanger, a throttle and an indoor heat exchanger connected in sequence; a refrigerant regulating branch, a liquid storage end is connected to the heat exchange circuit located between the throttle and the indoor heat exchanger, and an air supply end is connected to the return air port of the compressor; wherein the refrigerant regulating branch includes: a liquid storage device configured to store refrigerant; a first control valve, arranged at the liquid storage end of the refrigerant regulating branch, connected to the liquid storage port of the liquid storage device; a second control valve, arranged at the air supply end of the refrigerant regulating branch, connected to the air supply port of the liquid storage device; and the above-mentioned control device for the heat exchange system.

[0025] In some embodiments, the storage medium stores program instructions, and when the program instructions are run, the above-mentioned control method for the heat exchange system is executed.

[0026] The control method, control device, heat exchange system and storage medium for a heat exchange system provided by the embodiments of the present disclosure can achieve the following technical effects:

[0027] The heat exchange system is provided with a heat exchange circuit and a refrigerant regulating branch connected in parallel with the heat exchanger in the heat exchange circuit. The refrigerant regulating branch includes a first control valve, a liquid storage device and a second control valve connected in sequence. The refrigerant in the heat exchange circuit can flow to the liquid storage device through the opened first control valve, and the refrigerant in the liquid storage device can flow to the heat exchange circuit through the opened second control valve. When the operating frequency of the compressor is high, it is determined whether there is a need for air replenishment according to the exhaust temperature of the compressor or the temperature of the evaporating coil. In the case of the need for air replenishment, the first control valve is controlled to open to realize the storage of gaseous refrigerant. After there is part of the gaseous refrigerant in the liquid storage device, the second control valve is opened to realize the air replenishment of the compressor. According to the exhaust temperature of the compressor or the temperature of the evaporating coil, it is possible to accurately determine whether the compressor has a pressure ratio that is too large, thereby determining whether there is a need for air replenishment. In this way, the timing of opening the air replenishment can be determined more accurately, thereby better meeting the actual needs of the compressor.

[0028] The above general description and the following description are exemplary and explanatory only and are not intended to limit the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] One or more embodiments are exemplarily described by corresponding drawings, which do not limit the embodiments. Elements with the same reference numerals in the drawings are shown as similar elements, and the drawings do not constitute a scale limitation, and wherein:

[0030] Figure 1 is a structural schematic diagram of a heat exchange system provided by an embodiment of the present disclosure;

[0031] Figure 2 is a partial structural schematic diagram of a heat exchange system provided by an embodiment of the present disclosure;

[0032] Figure 3 is a schematic diagram of a control method for a heat exchange system provided by an embodiment of the present disclosure;

[0033] Figure 4 is a schematic diagram of another control method for a heat exchange system provided by an embodiment of the present disclosure;

[0034] Figure 5 is a schematic diagram of another control method for a heat exchange system provided by an embodiment of the present disclosure;

[0035] Figure 6 is a schematic diagram of another control method for a heat exchange system provided by an embodiment of the present disclosure;

[0036] Figure 7 is a schematic diagram of a control device for a heat exchange system provided by an embodiment of the present disclosure;

[0037] Figure 8 It is a schematic diagram of a heat exchange system provided in an embodiment of the present disclosure.

[0038] Reference numerals:

[0039] 100: heat exchange system; 200: compressor; 300: outdoor heat exchanger; 400: throttle; 500: indoor heat exchanger; 600: refrigerant regulating branch; 700: three-way pipe;

[0040] 610: liquid storage device; 620: first control valve; 630: second control valve;

[0041] 710: first pipe section; 720: second pipe section; 730: third pipe section;

[0042] 810: first air outlet pipe section; 820: second air outlet pipe section;

[0043] 110: control device; 70: processor; 71: memory; 72: communication interface; 73: bus. DETAILED DESCRIPTION

[0044] In order to be able to understand the features and technical contents of the embodiments of the present disclosure in more detail, the implementation of the embodiments of the present disclosure is described in detail below in conjunction with the accompanying drawings. The attached drawings are for reference only and are not used to limit the embodiments of the present disclosure. In the following technical description, for the convenience of explanation, a full understanding of the disclosed embodiments is provided through multiple details. However, one or more embodiments can still be implemented without these details. In other cases, to simplify the drawings, well-known structures and devices can be simplified for display.

[0045] The terms "first", "second", etc. in the specification and claims of the embodiments of the present disclosure and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchanged where appropriate, so that the embodiments of the embodiments of the present disclosure described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.

[0046] Unless otherwise stated, the term "plurality" means two or more.

[0047] In the embodiment of the present disclosure, the character " / " indicates that the preceding and following objects are in an "or" relationship. For example, A / B indicates: A or B.

[0048] The term "and / or" is a description of the association relationship between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or, A and B.

[0049] The term "correspondence" may refer to an association relationship or a binding relationship. The correspondence between A and B means that there is an association relationship or a binding relationship between A and B.

[0050] Combination Figure 1 and Figure 2 As shown, an embodiment of the present disclosure provides a heat exchange system, which includes a heat exchange circuit and a refrigerant regulating branch 600.

[0051] The heat exchange circuit includes a compressor 200, an outdoor heat exchanger 300, a throttle 400 and an indoor heat exchanger 500 which are connected in sequence.

[0052] The refrigerant regulating branch 600 includes a liquid storage end and an air supply end. The liquid storage end of the refrigerant regulating branch 600 is connected to the heat exchange circuit between the throttle 400 and the indoor heat exchanger 500, and the air supply end of the refrigerant regulating branch 600 is connected to the return air port of the compressor 200. In this way, the refrigerant in the heat exchange system can enter the refrigerant regulating branch 600 through the liquid storage end of the refrigerant regulating branch 600, so that the refrigerant is stored in the refrigerant regulating branch 600, thereby reducing the amount of refrigerant participating in the heat exchange cycle. The amount of refrigerant participating in the refrigerant cycle in the heat exchange system can be adjusted to improve the rationality of refrigerant charging of the heat exchange system under different working conditions and improve the performance of the heat exchange system.

[0053] In other embodiments, the refrigerant in the refrigerant regulating branch 600 can flow into the heat exchange system through the air supply end of the refrigerant regulating branch 600 to increase the amount of refrigerant participating in the heat exchange cycle.

[0054] The refrigerant regulating branch 600 includes a first control valve 620 , a liquid storage device 610 , and a second control valve 630 which are connected in sequence.

[0055] Among them, the first control valve 620 is arranged at the liquid storage end of the refrigerant regulating branch 600, and the first control valve 620 is connected to the liquid storage port of the liquid storage device 610. That is, the liquid storage end of the refrigerant regulating branch 600 is connected to the liquid storage port of the liquid storage device 610. The liquid storage end of the refrigerant regulating branch 600 is connected to the heat exchange circuit between the throttle 400 and the indoor heat exchanger 500. In this way, the refrigerant between the throttle 400 and the indoor heat exchanger 500 can flow into the liquid storage device 610 through the liquid storage end of the refrigerant regulating branch 600 and the first control valve 620.

[0056] The second control valve 630 is arranged at the air supply end of the refrigerant regulating branch 600, and the second control valve 630 is connected to the air supply port of the liquid storage device 610. That is, the air supply end of the refrigerant regulating branch 600 is connected to the air supply port of the liquid storage device 610. The refrigerant in the liquid storage device 610 can flow back into the compressor 200 through the air supply end of the refrigerant regulating branch 600 and the second control valve 630, that is, flow back into the heat exchange circuit. In this way, not only can the amount of refrigerant participating in the heat exchange cycle in the heat exchange circuit be increased, but also air can be supplied to the compressor 200, thereby increasing the air intake and exhaust volume of the compressor 200, thereby increasing the heat exchange of the heat exchange system and improving the energy efficiency of the heat exchange system.

[0057] Exemplarily, the second control valve 630 includes an electronic expansion valve. The second control valve 630 is arranged at the air supply end of the refrigerant regulating branch 600, and the air supply end of the refrigerant regulating branch 600 is connected to the return air port of the compressor 200. The second control valve 630 is an electronic expansion valve. In this way, not only can the refrigerant in the liquid storage device 610 be selectively transmitted to the compressor 200 by opening and closing the electronic expansion valve to increase the refrigerant participating in the heat exchange cycle, but the electronic expansion valve can also throttle the refrigerant, and the liquid refrigerant in the liquid storage device 610 is throttled to become a gas refrigerant to supply to the return air port of the compressor, thereby increasing the air supply amount of the compressor 200.

[0058] Optionally, the refrigeration system further includes: a gas-liquid separation device, which is arranged at the liquid storage end of the refrigerant regulating branch. The gas-liquid separation device has at least three ports. The first end is connected to the liquid storage end of the refrigerant regulating branch, so that the refrigerant enters the gas-liquid separation device from the first end. The second end is connected to the liquid storage device, which is configured to input as much gaseous refrigerant as possible into the liquid storage device. The third end is connected to the indoor heat exchanger or the outdoor heat exchanger to input the liquid refrigerant into the heat exchanger.

[0059] Optionally, the gas-liquid separation device includes: a three-way pipe 700 configured to separate the refrigerant into gaseous refrigerant and liquid refrigerant. Specifically, the pipeline at the liquid storage end of the refrigerant regulating branch 600 is connected to the first pipe section 710, the second pipe section 720 and the third pipe section 730 by the three-way pipe 700. Among them, the first pipe section 710 is connected to the side close to the throttle; the second pipe section 720 is connected to the heat exchanger, and the heat exchanger is the indoor heat exchanger 500 or the outdoor heat exchanger 300; the third pipe section 730 is connected to the refrigerant inlet of the liquid storage device, and the gaseous refrigerant can enter the liquid storage device through the third pipe. In this way, as much gaseous refrigerant as possible can flow into the liquid storage device when replenishing gas.

[0060] Optionally, the third pipe section 730 is arranged above the second pipe section 720, and there is a fold angle between the third pipe section 730 and the first pipe section 710. In this way, after the gas-liquid two-phase refrigerant flows through the throttle and passes through the first pipe section 710, it can collide with the inner wall of the third pipe section 730 at the connection between the first pipe section 710 and the third pipe section 730, and the third pipe section 730 hinders the refrigerant from continuing to flow, and the refrigerant slows down or stays briefly at the connection. The third pipe section 730 is located above the second pipe section 720, so that the gas refrigerant in the gas-liquid two-phase refrigerant can flow upward at the connection to flow into the third pipe section 730, and then flow into the liquid storage device 610. The liquid refrigerant in the gas-liquid two-phase refrigerant can flow downward by its own gravity and flow into the second pipe section 720, and then flow to the heat exchanger to continue the heat exchange cycle.

[0061] Furthermore, the opening of the folded corner is upward, and the folded corner has an angle ranging from 30 degrees to 70 degrees.

[0062] With this optional embodiment, the angle between the first pipe segment 710 and the third pipe segment 730 opens upward, and the angle range of the angle is 30 to 70 degrees. In other words, the angle between the first pipe segment 710 and the third pipe segment 730 is smaller than the angle between the first pipe segment 710 and the second pipe segment 720. In this way, when the refrigerant flows into the three-way pipe 700 along the first pipe segment 710, the tendency of the refrigerant to move along the second pipe segment 720 is greater than the tendency of the refrigerant to move along the first pipe segment 710, so that more refrigerant can still flow into the second pipe segment 720 and into the heat exchanger, so as to realize the normal heat exchange cycle of the heat exchange circuit.

[0063] For example, the angle of the bend between the first pipe segment 710 and the third pipe segment 730 may be 30 degrees, 35 degrees, 40 degrees, 45 degrees, 50 degrees, 55 degrees, 60 degrees, 65 degrees or 70 degrees, etc. Optionally, the ratio of the amount of refrigerant flowing into the second pipe segment 720 to the total amount of refrigerant flowing into the first pipe segment 710 is inversely proportional to the angle of the bend. When the angle of the bend is smaller, the amount of refrigerant flowing into the second pipe segment 720 is larger, and when the angle of the bend is larger, the amount of refrigerant flowing into the second pipe segment 720 is smaller.

[0064] Optionally, the liquid storage device includes a liquid storage tank configured to store the refrigerant entering the liquid storage device 610 .

[0065] Optionally, the refrigerant outlet of the liquid storage tank is arranged at the upper end of the liquid storage tank, and the refrigerant inlet of the liquid storage tank is arranged at the lower end of the liquid storage tank. In this way, it is beneficial to improve the separation degree of the gaseous refrigerant and the liquid refrigerant in the liquid storage tank.

[0066] Furthermore, along the axial direction of the liquid storage tank, the ratio of the length between the refrigerant outlet of the liquid storage tank and the top wall of the liquid storage tank to the axial length of the liquid storage tank ranges from 0 to 0.1.

[0067] When the ratio between the length between the refrigerant outlet of the liquid storage tank and the top wall of the liquid storage tank and the axial length of the liquid storage tank is 0, the refrigerant outlet of the liquid storage tank is arranged on the top wall of the liquid storage tank. When the ratio is greater than 0, and the ratio is less than or equal to 0.1, the refrigerant outlet of the liquid storage tank is arranged at the upper end of the side wall of the liquid storage tank, or the side wall at the refrigerant outlet of the liquid storage tank extends into the liquid storage tank through the top wall of the liquid storage tank. Exemplarily, the ratio between the length between the refrigerant outlet of the liquid storage tank and the top wall of the liquid storage tank and the axial length of the liquid storage tank is 0, 0.01, 0.02, 0.03, 0.04, 0.05, 0.06, 0.07, 0.08, 0.09 or 0.1, etc.

[0068] Optionally, along the axial direction of the liquid storage tank, a ratio of a length between the refrigerant inlet of the liquid storage tank and the bottom wall of the liquid storage tank to an axial length of the liquid storage tank ranges from 0 to 0.1.

[0069] When the ratio between the length between the refrigerant inlet of the liquid storage tank and the bottom wall of the liquid storage tank and the axial length of the liquid storage tank is 0, the refrigerant inlet of the liquid storage tank is located at the bottom wall of the liquid storage tank. When the ratio is greater than 0, and the ratio is less than or equal to 0.1, the refrigerant inlet of the liquid storage tank is located at the lower end of the side wall of the liquid storage tank, or the side wall at the refrigerant inlet of the liquid storage tank extends into the liquid storage tank through the bottom wall of the liquid storage tank. Exemplarily, the ratio between the length between the refrigerant inlet of the liquid storage tank and the bottom wall of the liquid storage tank and the axial length of the liquid storage tank is 0, 0.01, 0.02, 0.03, 0.04, 0.05, 0.06, 0.07, 0.08, 0.09 or 0.1, etc.

[0070] Optionally, the refrigerant inlet of the liquid storage tank is arranged at the bottom wall of the liquid storage tank, and the refrigerant outlet of the liquid storage tank is arranged at the upper end of the circumferential side wall of the liquid storage tank. In this way, when the refrigerant flows into the liquid storage tank, the refrigerant has a tendency to move along the axial direction of the liquid storage tank. When the refrigerant flows out of the liquid storage tank, the refrigerant flows radially along the liquid storage tank. Due to the impact of the refrigerant in the three-way pipe 700, not only the gaseous refrigerant can flow into the liquid storage tank through the third pipe section 730, but also a small amount of liquid refrigerant can enter the liquid storage tank through the third pipe section 730. In the process of the refrigerant flowing into and out of the liquid storage tank, the flow direction of the refrigerant changes to increase the storage time of the same refrigerant in the liquid storage tank, thereby improving the gas-liquid separation degree of the refrigerant entering the liquid storage tank and improving the dryness of the refrigerant flowing out of the refrigerant outlet of the liquid storage tank.

[0071] Optionally, the refrigerant inlet of the liquid storage tank is arranged at the lower end of the circumferential side wall of the liquid storage tank, and the refrigerant outlet of the liquid storage tank is arranged at the top wall of the liquid storage tank. In this way, when the refrigerant flows into the liquid storage tank, the refrigerant has a radial movement trend along the liquid storage tank. When the refrigerant flows out of the liquid storage tank, the refrigerant flows along the axial direction of the liquid storage tank. Due to the impact of the refrigerant in the three-way pipe 700, not only the gaseous refrigerant can flow into the liquid storage tank through the third pipe section 730, but also a small amount of liquid refrigerant can enter the liquid storage tank through the third pipe section 730. In the process of the refrigerant flowing into and out of the liquid storage tank, the flow direction of the refrigerant changes to increase the storage time of the same refrigerant in the liquid storage tank, thereby improving the gas-liquid separation degree of the refrigerant entering the liquid storage tank and improving the dryness of the refrigerant flowing out of the refrigerant outlet of the liquid storage tank.

[0072] Optionally, the liquid storage device 610 includes a liquid storage tank, and the ratio between the inner diameter of the liquid storage tank and the inner diameter of the third pipe segment 730 is in the range of 5 to 10. In this way, when the refrigerant in the third pipe segment 730 enters the liquid storage tank, the space increases, the pressure decreases, and part of the liquid refrigerant becomes a gas refrigerant to increase the content of the gaseous refrigerant in the liquid storage tank. Exemplarily, the ratio between the inner diameter of the liquid storage tank and the inner diameter of the third pipe segment 730 can be 5, 5.5, 6, 6.5, 7, 7.5, 8, 8.5, 9, 9.5, 10, etc.

[0073] Optionally, the gas-liquid separation device further includes an air outlet pipe section, which includes a first air outlet pipe section 810 and a second air outlet pipe section 820 that are connected to each other, the first air outlet pipe section 810 is connected to the refrigerant outlet of the liquid storage tank, and the inner diameter of the second air outlet pipe section 820 is smaller than the inner diameter of the first air outlet pipe section 810. In this way, the gaseous refrigerant flowing out of the refrigerant outlet of the liquid storage tank can flow into the return pipe after passing through the first air outlet pipe section 810 and the second air outlet pipe section 820. The inner diameter of the second air outlet pipe section 820 is smaller than the inner diameter of the first air outlet pipe section 810, and the second air outlet pipe section 820 can play a throttling role, and can throttle a small amount of liquid refrigerant mixed in the gaseous refrigerant flowing out of the refrigerant outlet of the liquid storage tank, so that the small amount of liquid refrigerant becomes a gas-liquid two-phase refrigerant, thereby further improving the dryness of the gaseous refrigerant flowing out of the refrigerant outlet of the liquid storage tank, and improving the gas-liquid separation effect of the gas-liquid separation device used in the heat exchange system.

[0074] Optionally, the ratio of the inner diameter of the first air outlet pipe section 810 to the inner diameter of the second air outlet pipe section 820 is in the range of 3.8 to 5.4, so that when the gaseous refrigerant flows through the first air outlet pipe section 810 and the second air outlet pipe section 820, the second air outlet pipe section 820 can throttle a small amount of liquid refrigerant mixed in the gaseous refrigerant, thereby improving the gas-liquid separation effect.

[0075] Optionally, the ratio of the inner diameter of the first air outlet pipe section 810 to the inner diameter of the second air outlet pipe section 820 may be 3.8, 4, 4.2, 4.4, 4.6, 4.8, 5, 5.2 or 5.4.

[0076] Optionally, the gas-liquid separation device is configured to replace part of the pipeline upstream of the liquid storage device in the refrigerant regulating branch, that is, the refrigerant flows through the liquid storage device and then enters the liquid storage device.

[0077] Optionally, the gas-liquid separation device is arranged in parallel with part of the pipeline upstream of the liquid storage device, and the two flow paths can be switched on and off separately. In this way, the pipeline where the gas-liquid separation device is located can be opened only when the compressor needs to replenish gas to store as much gas as possible, and the flow path where the ordinary pipeline is located can be opened during normal liquid storage so that the refrigerant directly enters the liquid storage device.

[0078] Optionally, in other embodiments, the refrigerant regulating branch of the heat exchange system is further provided with a flash evaporator. The flash evaporator is arranged between the first control valve and the second control valve. Further, it can be arranged between the first control valve and the liquid storage device. In this way, after the refrigerant enters the flash evaporator, due to the sudden decrease in pressure, a part of the liquid refrigerant will become a gaseous refrigerant. Such an arrangement is conducive to improving the dryness of the gaseous refrigerant used for gas replenishment, reducing the risk of liquid refrigerant entering the compressor during the gas replenishment process to cause liquid hammer, thereby helping to improve the reliability of the compressor operation.

[0079] The heat exchange system also includes a processor. The processor is configured to determine the air replenishment demand according to the exhaust temperature or evaporation coil temperature of the compressor when the operating frequency of the compressor is greater than or equal to the first frequency threshold; and to control the first control valve and the second control valve to achieve air replenishment when there is an air replenishment demand. In this way, when the compressor is under a large operating load, the air replenishment demand of the compressor is determined by the exhaust temperature or evaporation coil temperature of the compressor, and timely air replenishment is achieved, thereby ensuring the performance of the compressor.

[0080] Combination Figure 1 and Figure 2 The heat exchange system shown in the figure, the embodiment of the present disclosure provides a control method for the heat exchange system. Figure 3 As shown, the control method for the heat exchange system includes:

[0081] S301: The processor obtains the operating frequency of the compressor.

[0082] S302: When the operating frequency of the compressor is greater than or equal to a first frequency threshold, the processor determines the air replenishment demand according to the exhaust temperature of the compressor or the evaporation coil temperature.

[0083] Here, the evaporation coil temperature refers to the coil temperature on the evaporation side, that is, the coil temperature of the heat exchanger serving as the evaporator.

[0084] S303: When there is a need for air supplementation, the processor controls the first control valve to open to a first opening degree.

[0085] S304: After the first time interval, the processor controls the second control valve to open to a second opening degree.

[0086] Here, after the processor determines the air supplement demand according to the exhaust gas temperature of the compressor or the evaporator coil temperature, if there is no air supplement demand, both the first control valve and the second control valve remain in a closed state.

[0087] Using the control method for a heat exchange system provided by an embodiment of the present disclosure, when the operating frequency of the compressor is high, it is determined whether there is a need for air replenishment based on the exhaust temperature of the compressor or the temperature of the evaporating coil. When there is a need for air replenishment, the first control valve is controlled to open to achieve storage of the gaseous refrigerant, and after there is some gaseous refrigerant in the liquid storage device, the second control valve is opened to achieve air replenishment in the compressor. Based on the exhaust temperature of the compressor or the temperature of the evaporating coil, it is possible to accurately determine whether the compressor has a pressure ratio that is too large, thereby determining whether there is a need for air replenishment. In this way, the timing for starting the air replenishment can be determined more accurately, thereby better meeting the actual needs of the compressor.

[0088] If the compressor's operating frequency is high, it means that the current operating load is large. At this time, the air conditioner's heat exchange capacity may have declined, and it is necessary to turn on air replenishment to improve the compressor's heat exchange capacity. If the compressor's operating frequency is low, it means that the current compressor's operating load is small, and the heat exchange capacity can meet the current operating needs. Therefore, judging the air replenishment demand only when the compressor frequency is high can reduce unnecessary judgment processes.

[0089] Optionally, the value of the first time interval is 10 seconds.

[0090] Optionally, the value range of the first opening is 80 steps to 200 steps. In this way, the valve opening is limited to a smaller value, which is convenient for controlling the air replenishment process. If the valve is directly opened to a larger opening, more liquid refrigerant will enter. At this time, the proportion of liquid refrigerant in the refrigerant flowing through the second control valve increases, which is prone to liquid hammer and affects the reliability of the compressor.

[0091] Optionally, the second opening degree ranges from 80 steps to 200 steps.

[0092] Optionally, the value range of the first frequency threshold is 25 Hz to 35 Hz, for example, 30 Hz.

[0093] Combination Figure 4 As shown, the embodiment of the present disclosure provides another control method for a heat exchange system, comprising:

[0094] S401: The processor obtains the operating frequency of the compressor.

[0095] S402: When the operating frequency of the compressor is greater than or equal to a first frequency threshold and less than a second frequency threshold, the processor determines the air replenishment requirement according to the exhaust temperature of the compressor.

[0096] S403: When the operating frequency of the compressor is greater than or equal to the second frequency threshold, the processor determines the air replenishment demand according to the evaporator coil temperature.

[0097] S404: When there is a need for air supplementation, the processor controls the first control valve to open to a first opening degree.

[0098] S405: After the first time interval, the processor controls the second control valve to open to a second opening degree.

[0099] If the operating frequency of the compressor is greater than or equal to the second frequency threshold, it means that the operating load of the compressor is greater and it is in a high-load operating state, and it is very likely that there is a need for air replenishment. Before the operating frequency of the compressor reaches the second frequency threshold, it is very likely that it has been determined that there is a need for air replenishment and the air replenishment process has been started. The air replenishment process will have a greater impact on the exhaust temperature. Therefore, when the operating frequency of the compressor is greater than or equal to the second frequency threshold, using the evaporator coil temperature as the judgment basis can avoid the interference caused by the air replenishment process and more accurately reflect the current actual air replenishment demand.

[0100] Optionally, the second frequency threshold value ranges from 50 Hz to 70 Hz, for example, 50 Hz, 55 Hz, 60 Hz, 65 Hz or 70 Hz.

[0101] Optionally, the processor determines the need for air replenishment according to the exhaust temperature of the compressor, including: when the exhaust temperature is greater than the first exhaust temperature, the processor determines that there is a need for air replenishment. If the exhaust temperature is too high, it means that the pressure ratio is too large, and the compressor needs to be refilled. Therefore, the need for air replenishment can be accurately determined according to the exhaust temperature.

[0102] Optionally, the processor determines the air replenishment demand according to the exhaust temperature of the compressor, and further includes: when the exhaust temperature is less than or equal to the first exhaust temperature, the processor determines the air replenishment demand according to the operating frequency of the compressor. The operating frequency of the compressor can reflect the current operating load of the compressor. Therefore, based on the exhaust temperature, further determining whether there is an air replenishment demand according to the operating frequency of the compressor can improve the accuracy of determining the air replenishment demand.

[0103] Optionally, the first exhaust temperature ranges from 45°C to 55°C, for example, 50°C.

[0104] Optionally, when the exhaust temperature is less than or equal to the first exhaust temperature, the processor determines the air supplement demand according to the operating frequency of the compressor, including: when the operating frequency of the compressor is greater than the first frequency threshold and less than or equal to the second frequency threshold, the processor determines that there is no air supplement demand. When the operating frequency of the compressor is greater than the second frequency threshold, the processor determines that there is an air supplement demand.

[0105] Alternatively, the processor determines the need for air replenishment according to the exhaust temperature, including: when the exhaust temperature is greater than the first exhaust temperature, the processor determines that there is a need for air replenishment. When the exhaust temperature is less than or equal to the first exhaust temperature, the processor determines that there is no need for air replenishment. If the exhaust temperature is too high, it means that the pressure ratio is too large, and the compressor needs to be refilled. Therefore, the need for air replenishment can be determined according to the size of the exhaust temperature.

[0106] Optionally, when the exhaust temperature is greater than the first exhaust temperature and the processor determines that there is a need for air replenishment, the processor controls the second control valve to open to the second opening, and the control method for the heat exchange system also includes: the processor obtains the real-time exhaust temperature, and when the exhaust temperature is less than the first exhaust temperature and the operating frequency of the compressor is less than or equal to the second frequency threshold, the processor controls the first control valve and the second control valve to close to stop air replenishment. Here, the end time of the air replenishment process is determined jointly by the exhaust temperature and the operating frequency of the compressor, which can ensure that the air replenishment process is fully carried out, guarantee the air replenishment effect, and thus ensure the performance of the compressor. Specifically, if the operating frequency of the compressor is greater than the second frequency threshold, it means that the operating load of the compressor is large, and air replenishment at this time is beneficial to improving the performance of the compressor.

[0107] Optionally, after the processor controls the second control valve to open to the second opening, the control method for the heat exchange system further includes: the processor adjusts the opening of the second control valve according to the real-time exhaust temperature so that the exhaust temperature is maintained within a target temperature range. The upper temperature threshold of the target temperature range is less than the first exhaust temperature. In this way, the air supply amount is controlled by controlling the opening of the second control valve, so that the air supply process can more accurately meet the real-time demand.

[0108] Optionally, the processor determines the air replenishment requirement according to the evaporator coil temperature, including: when the evaporator coil temperature is less than the coil temperature threshold, the processor determines that there is an air replenishment requirement. When the evaporator coil temperature is greater than or equal to the coil temperature threshold, the processor determines that there is no air replenishment requirement. If the evaporator coil temperature is low, it means that the pressure at the evaporator coil is low, the load is large, and the pressure ratio is high, and air replenishment is required.

[0109] Combination Figure 5 As shown, the embodiment of the present disclosure provides another control method for a heat exchange system, comprising:

[0110] S501: The processor obtains the operating frequency of the compressor.

[0111] S502: The processor determines whether the frequency of the compressor is greater than or equal to a first frequency threshold.

[0112] If yes, the processor executes steps S503 and S504; if no, the processor executes steps S505 and S506.

[0113] S503, the processor determines the air replenishment requirement according to the exhaust temperature of the compressor or the evaporator coil temperature.

[0114] S504, when there is a need for air supplementation, the processor controls the first control valve to open to a first opening degree; and, after a first time interval, controls the second control valve to open to a second opening degree.

[0115] S505: The processor determines the refrigerant demand during operation according to the operating frequency of the compressor.

[0116] S506: The processor adjusts the refrigerant storage capacity of the refrigerant regulating branch according to the refrigerant demand.

[0117] Using the control method for the heat exchange system provided by the embodiment of the present disclosure, if the frequency of the compressor is greater than or equal to the first frequency threshold, it means that the load of the compressor operation is large. At this time, the air replenishment demand of the compressor is judged and the air replenishment operation is performed when there is an air replenishment demand, thereby ensuring the operating performance of the compressor. When the operating frequency of the compressor is less than the first frequency threshold, it means that the load of the compressor operation is small. At this time, the refrigerant actually required for the operation of the compressor is relatively small. Therefore, the refrigerant demand is further determined, and the refrigerant storage of the refrigerant regulating branch is adjusted according to the refrigerant demand. It is possible to adjust the amount of refrigerant participating in the heat exchange cycle according to the actual operating needs, thereby improving the performance of the heat exchange system. In this way, the actual demand of the compressor can be judged according to the operating conditions of the compressor, and operations such as air replenishment and refrigerant storage can be performed, thereby ensuring the performance of the heat exchange system.

[0118] Combination Figure 6 As shown, the embodiment of the present disclosure provides another control method for a heat exchange system, comprising:

[0119] S601: The processor obtains the operating frequency of the compressor.

[0120] S602: The processor determines whether the frequency of the compressor is greater than or equal to a first frequency threshold.

[0121] If yes, the processor executes steps S603 and S604; if no, the processor executes step S605.

[0122] S603, the processor determines the air replenishment requirement according to the exhaust temperature of the compressor or the evaporator coil temperature.

[0123] S604: When there is a need for air supplementation, the processor controls the first control valve to open to a first opening degree; and, after a first time interval, controls the second control valve to open to a second opening degree.

[0124] S605: The processor determines whether the operating frequency of the compressor is greater than a third frequency threshold.

[0125] If yes, the processor executes steps S606 and S607. If no, the processor executes steps S608 and S609.

[0126] S606: The processor determines that the demand for refrigerant is a first demand.

[0127] S607: The processor controls the first control valve and the second control valve to remain closed.

[0128] S608: The processor determines that the demand for refrigerant is less than the first demand.

[0129] S609, the processor controls the first control valve and the second control valve to open, wherein the opening degree of the first control valve is greater than the opening degree of the second control valve.

[0130] In this way, the refrigerant demand is determined according to the operating frequency of the compressor. If the refrigerant demand is a higher first demand, the first control valve and the second control valve are controlled to remain closed, and no refrigerant is stored. At this time, the refrigerant in the heat exchange circuit is the largest. If the refrigerant demand is lower than the first demand, the first control valve and the second control valve are controlled to open so that part of the refrigerant is stored in the refrigerant regulating branch. In this way, the amount of refrigerant in the refrigerant regulating branch can be adjusted according to actual demand, thereby adjusting the amount of refrigerant participating in the heat exchange cycle, which is beneficial to improving the performance of the heat exchange system.

[0131] Optionally, the processor controls the first control valve and the second control valve to open, including: the processor controls the throttle not to throttle, and after a first time interval, controls the first control valve and the second control valve to open, and the opening of the first control valve is greater than the opening of the second control valve. In this way, with the low-pressure traction of the compressor suction end, the refrigerant in the condenser can directly enter the liquid storage device to achieve refrigerant storage.

[0132] Specifically, the first control valve and the second control valve may be solenoid valves. More specifically, the first control valve and the second control valve may be proportional solenoid valves, so that the openings of the first control valve and the second control valve may be directly controlled.

[0133] Optionally, the opening degree of the first control valve is fully open.

[0134] Optionally, the opening degree of the second control valve is 150 steps to 300 steps.

[0135] Optionally, when the operating frequency of the compressor is less than or equal to the third frequency threshold, the processor determines that the demand for the refrigerant is less than the first demand, including: when the operating frequency of the compressor is less than or equal to the third frequency threshold and greater than the fourth frequency threshold, the processor determines that the demand for the refrigerant is the second demand. When the operating frequency of the compressor is less than or equal to the fourth frequency threshold, the processor determines that the demand for the refrigerant is the third demand. The first demand is greater than the second demand, and the second demand is greater than the third demand.

[0136] Optionally, the processor controls the first control valve and the second control valve to open, including: the processor determines the opening time according to the refrigerant demand. After the first control valve is opened for a period of time that reaches the opening time, the processor controls the second control valve to close. Here, after the second control valve is closed, one end of the refrigerant regulating branch is in a blocked state. The refrigerant is immediately prevented from flowing into the heat exchange circuit from one end of the second control valve. At the same time, due to the effect of air pressure, the refrigerant will stop flowing into the liquid storage device in a relatively short period of time, and the liquid storage process of the liquid storage device stops.

[0137] Optionally, the processor determines the opening duration according to the refrigerant demand, including: when the refrigerant demand is the second demand, the processor determines the opening duration to be the first duration. When the refrigerant demand is the third demand, the processor determines the opening duration to be the second duration. Wherein, the first duration is less than the second duration. In this way, when the refrigerant demand is low, a longer opening duration is used, so that the amount of refrigerant in the refrigerant regulating branch increases, thereby reducing the amount of refrigerant in the heat exchange circuit, thereby ensuring that the amount of refrigerant involved in the heat exchange is consistent with the actual heat exchange demand.

[0138] Exemplarily, if the operating frequency of the compressor is less than or equal to the third frequency threshold and greater than the fourth frequency threshold, the processor determines that the refrigerant demand is partial refrigerant, and the refrigerant storage in the refrigerant regulating branch is half of the total refrigerant storage volume. At this time, the opening duration is determined to be t1. If the operating frequency of the compressor is less than or equal to the fourth frequency threshold, the refrigerant demand is determined to be partial refrigerant, and the refrigerant storage in the refrigerant regulating branch is the total refrigerant storage volume. At this time, the opening duration is determined to be the sum of t1 and t2.

[0139] Optionally, t2>t1. Compared with the setting mode of t2=t1, setting a larger t2 for delay control is conducive to ensuring that as much refrigerant as possible is stored in the refrigerant regulating branch, so that the storage amount of refrigerant in the refrigerant regulating branch is closer to the total refrigerant storage volume.

[0140] Optionally, after the first control valve is opened for a certain period of time, the method further includes: the processor controls the first control valve to close. In this way, both the first control valve and the second control valve are closed, so that the liquid storage process of the liquid storage device can be quickly stopped.

[0141] Optionally, after the first control valve is opened for a certain period of time, the control method for the heat exchange system further comprises: the processor controls the throttle to resume throttling. In this way, after the liquid storage is completed, the heat exchange process automatically returns to normal.

[0142] Combination Figure 7As shown, the embodiment of the present disclosure provides a control device 110 for a heat exchange system, including a processor 70 and a memory 71. Optionally, the device may also include a communication interface 72 and a bus 73. The processor 70, the communication interface 72, and the memory 71 may communicate with each other through the bus 73. The communication interface 72 may be used for information transmission. The processor 70 may call the logic instructions in the memory 71 to execute the control method for the heat exchange system of the above embodiment.

[0143] In addition, the logic instructions in the above-mentioned memory 71 can be implemented in the form of software functional units and can be stored in a computer-readable storage medium when sold or used as an independent product.

[0144] The memory 71 is a computer-readable storage medium that can be used to store software programs and computer executable programs, such as program instructions / modules corresponding to the method in the embodiment of the present disclosure. The processor 70 executes the function application and data processing by running the program instructions / modules stored in the memory 71, that is, realizing the control method for the heat exchange system in the above embodiment.

[0145] The memory 71 may include a program storage area and a data storage area, wherein the program storage area may store an operating system and an application required for at least one function; the data storage area may store data created according to the use of the terminal device, etc. In addition, the memory 71 may include a high-speed random access memory and may also include a non-volatile memory.

[0146] Combination Figure 8 As shown, an embodiment of the present disclosure provides a heat exchange system 100, including: a heat exchange system body, and the above-mentioned control device 110 for the heat exchange system. The control device 110 for the heat exchange system is installed in the heat exchange system body 100. The installation relationship described here is not limited to placement inside the product, but also includes installation connections with other components of the product, including but not limited to physical connections, electrical connections, or signal transmission connections. It can be understood by those skilled in the art that the control device 110 for the heat exchange system can be adapted to a feasible product body, thereby realizing other feasible embodiments.

[0147] An embodiment of the present disclosure provides a computer-readable storage medium storing computer-executable instructions, wherein the computer-executable instructions are configured to execute the above-mentioned control method for a heat exchange system.

[0148] The computer-readable storage medium mentioned above may be a transient computer-readable storage medium or a non-transitory computer-readable storage medium.

[0149] The technical solution of the embodiment of the present disclosure can be embodied in the form of a software product, which is stored in a storage medium and includes one or more instructions for enabling a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in the embodiment of the present disclosure. The aforementioned storage medium may be a non-transient storage medium, including: a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and other media that can store program codes, or a transient storage medium.

[0150] The above description and the accompanying drawings fully illustrate the embodiments of the present disclosure so that those skilled in the art can practice them. Other embodiments may include structural, logical, electrical, process and other changes. The embodiments represent only possible changes. Unless explicitly required, separate components and functions are optional, and the order of operation may vary. The parts and features of some embodiments may be included in or replace the parts and features of other embodiments. Moreover, the words used in this application are only used to describe the embodiments and are not used to limit the claims. As used in the description of the embodiments and the claims, unless the context clearly indicates, the singular forms of "a", "an" and "the" are intended to include plural forms as well. Similarly, the term "and / or" as used in this application refers to any and all possible combinations of listings containing one or more associated ones. In addition, when used in the present application, the term "comprise" and its variants "comprises" and / or comprising refer to the presence of stated features, wholes, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or groups thereof. In the absence of further restrictions, the elements defined by the sentence "comprising a ..." do not exclude the presence of other identical elements in the process, method or device comprising the elements. In this article, each embodiment may focus on the differences from other embodiments, and the same and similar parts between the various embodiments may refer to each other. For the methods, products, etc. disclosed in the embodiments, if they correspond to the method part disclosed in the embodiments, then the relevant parts can refer to the description of the method part.

[0151] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software may depend on the specific application and design constraints of the technical solution. The technicians may use different methods for each specific application to implement the described functions, but such implementations should not be considered to exceed the scope of the embodiments of the present disclosure. The technicians may clearly understand that, for the convenience and simplicity of description, the specific working processes of the systems, devices and units described above may refer to the corresponding processes in the aforementioned method embodiments, and will not be repeated here.

[0152] In the embodiments disclosed herein, the disclosed methods and products (including but not limited to devices, equipment, etc.) can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units can be only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between each other shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms. The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to implement this embodiment. In addition, each functional unit in the embodiment of the present disclosure may be integrated in a processing unit, or each unit may exist physically alone, or two or more units may be integrated in one unit.

[0153] The flowchart and block diagram in the accompanying drawings show the possible architecture, function and operation of the system, method and computer program product according to the embodiment of the present disclosure. In this regard, each box in the flowchart or block diagram can represent a module, a program segment or a part of the code, and the module, the program segment or a part of the code contains one or more executable instructions for realizing the specified logical function. In some alternative implementations, the functions marked in the box can also occur in a different order from the order marked in the accompanying drawings. For example, two consecutive boxes can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, which can depend on the functions involved. In the description corresponding to the flowchart and the block diagram in the accompanying drawings, the operations or steps corresponding to different boxes can also occur in a different order from the order disclosed in the description, and sometimes there is no specific order between different operations or steps. For example, two consecutive operations or steps can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, which can depend on the functions involved. Each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, may be implemented by a dedicated hardware-based system that performs the specified functions or actions, or may be implemented by a combination of dedicated hardware and computer instructions.

Claims

1. A control method for a heat exchange system, characterized in that: The heat exchange system comprises: A heat exchange circuit includes a compressor, an outdoor heat exchanger, a throttle and an indoor heat exchanger connected in sequence; The refrigerant regulating branch has a liquid storage end connected to a heat exchange circuit between the throttle and the indoor heat exchanger, and an air supply end connected to an air return port of the compressor; Among them, the refrigerant regulation branch includes: a liquid storage device configured to store refrigerant; A first control valve is arranged at the liquid storage end of the refrigerant regulating branch and is connected to the liquid storage port of the liquid storage device; The second control valve is arranged at the air supply end of the refrigerant regulating branch and is connected to the air supply port of the liquid storage device; The control method comprises: Obtain the operating frequency of the compressor; When the operating frequency of the compressor is greater than or equal to the first frequency threshold, determining the air replenishment demand according to the exhaust temperature of the compressor or the evaporator coil temperature; When there is a need for air supplement, the first control valve is controlled to open to a first opening degree; and, After the first time interval, the second control valve is controlled to open to a second opening degree.

2. The control method according to claim 1, characterized in that: Determine the air replenishment requirement based on the compressor discharge temperature or evaporator coil temperature, including: When the operating frequency of the compressor is greater than or equal to the first frequency threshold and less than the second frequency threshold, the air replenishment demand is determined according to the exhaust temperature of the compressor; When the operating frequency of the compressor is greater than or equal to the second frequency threshold, the air replenishment demand is determined according to the evaporator coil temperature of the compressor.

3. The control method according to claim 2, characterized in that: Determine the air replenishment requirements based on the compressor discharge temperature, including: When the exhaust gas temperature is greater than the first exhaust gas temperature, it is determined that there is a supplementary air demand.

4. The control method according to claim 3, characterized in that: Determine the air replenishment requirement based on the compressor discharge temperature, including: When the exhaust gas temperature is less than or equal to the first exhaust gas temperature, the air replenishment demand is determined according to the operating frequency of the compressor.

5. The control method according to claim 2, characterized in that: Determine the air replenishment requirement based on the evaporator coil temperature, including: When the evaporator coil temperature is less than the coil temperature threshold, it is determined that there is a need for air replenishment; When the evaporator coil temperature is greater than or equal to the coil temperature threshold, it is determined that there is no supplemental air demand.

6. The control method according to any one of claims 1 to 5, characterized in that: After obtaining the operating frequency of the compressor, it also includes: When the operating frequency of the compressor is less than the first frequency threshold, determining the refrigerant demand during operation according to the operating frequency of the compressor; According to the refrigerant demand, adjust the refrigerant storage capacity of the refrigerant regulating branch.

7. The control method according to claim 6, characterized in that: Determine the refrigerant demand during operation based on the operating frequency of the compressor, including: When the operating frequency of the compressor is greater than a third frequency threshold, determining the demand for the refrigerant to be a first demand; When the operating frequency of the compressor is less than or equal to the third frequency threshold, determining that the demand for the refrigerant is less than the first demand; The third frequency threshold is smaller than the first frequency threshold.

8. A control device for a heat exchange system, comprising a processor and a memory storing program instructions, characterized in that: The processor is configured to execute the control method for a heat exchange system according to any one of claims 1 to 7 when running the program instructions.

9. A heat exchange system, characterized in that: include: A heat exchange circuit includes a compressor, an outdoor heat exchanger, a throttle and an indoor heat exchanger connected in sequence; The refrigerant regulating branch has a liquid storage end connected to a heat exchange circuit between the throttle and the indoor heat exchanger, and an air supply end connected to an air return port of the compressor; Among them, the refrigerant regulation branch includes: a liquid storage device configured to store refrigerant; A first control valve is arranged at the liquid storage end of the refrigerant regulating branch and is connected to the liquid storage port of the liquid storage device; The second control valve is arranged at the air supply end of the refrigerant regulating branch and is connected to the air supply port of the liquid storage device; The control device for a heat exchange system as claimed in claim 8.

10. A storage medium storing program instructions, characterized in that: When the program instructions are executed, the control method for a heat exchange system according to any one of claims 1 to 7 is executed.

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