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

Abstract

The application relates to the technical field of heat exchange systems, and discloses a control method for a heat exchange system, the heat exchange system comprising: a refrigerant adjusting branch, a liquid storage end connected with a heat exchange loop between a throttling device and an indoor heat exchanger, and a gas supplement end connected with a return gas port of a compressor; the refrigerant adjusting branch comprising: a liquid storage device, a first control valve arranged at the liquid storage end of the refrigerant adjusting branch, and a second control valve arranged at the gas supplement end of the refrigerant adjusting branch; the control method comprising: obtaining the operating frequency of the compressor; in the case that the operating frequency of the compressor is greater than or equal to a first frequency threshold, determining the gas supplement demand according to the exhaust temperature of the compressor or the evaporation coil temperature; in the case that the gas supplement demand exists, controlling the first control valve to be opened to a first opening degree; and after a first time interval, controlling the second control valve to be opened to a second opening degree. The application is beneficial to improving the gas supplement accuracy. The application also discloses a control device for the heat exchange system, the heat exchange system and a storage medium.

Description

Technical Field

[0001] This application relates to the field of heat exchange system technology, such as a control method, control device, heat exchange system, and storage medium for a heat exchange system. Background Technology

[0002] Air conditioners use a compressor and heat exchanger to create a refrigerant circulation loop with a certain flow rate, achieving heat exchange and thus regulating the ambient temperature. However, due to the diverse operating environments of air conditioners, problems such as increased suction volume and pressure ratio may occur in practical applications, causing a sharp decline in compressor performance and resulting in unsatisfactory air conditioner performance.

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

[0004] In the process of implementing the embodiments of this disclosure, at least the following problems were found in the related art:

[0005] The compressor's operating time and 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 gas replenishment process, which results in the gas replenishment process failing to accurately meet the compressor's actual gas replenishment needs.

[0006] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this application, and therefore may include information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0007] To provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. This summary is not intended as a general commentary, nor is it intended to identify key / important components or describe the scope of protection of these embodiments, but rather as a prelude to the detailed description that follows.

[0008] This disclosure provides a control method, control device, heat exchange system, and storage medium for a heat exchange system, to more accurately determine the timing of gas injection, 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 valve, and an indoor heat exchanger connected in sequence; a refrigerant regulating branch, with its liquid storage end connected to the heat exchange circuit located between the throttle valve and the indoor heat exchanger, and its gas supply end connected to the compressor's return port; wherein the refrigerant regulating branch includes: a liquid storage device configured to store refrigerant; a first control valve disposed at the liquid storage end of the refrigerant regulating branch and connected to the liquid storage port of the liquid storage device; and a second control valve disposed at the gas supply end of the refrigerant regulating branch and connected to the gas supply port of the liquid storage device; the control method includes: obtaining the compressor's operating frequency; when the compressor's operating frequency is greater than or equal to a first frequency threshold, determining the gas supply requirement based on the compressor's exhaust temperature or evaporator coil temperature; when there is a gas supply requirement, 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 gas supply requirement is determined based on the compressor's discharge temperature or the evaporator coil temperature, including: when the compressor's operating frequency is greater than or equal to a first frequency threshold and less than a second frequency threshold, the gas supply requirement is determined based on the compressor's discharge temperature; when the compressor's operating frequency is greater than or equal to the second frequency threshold, the gas supply requirement is determined based on the evaporator coil temperature.

[0011] Optionally, the gas replenishment requirement is determined based on the compressor's exhaust temperature, including: determining that there is a gas replenishment requirement when the exhaust temperature is higher than the first exhaust temperature.

[0012] Optionally, determining the gas supply requirement based on the compressor's exhaust temperature also includes: determining the gas supply requirement based on the compressor's operating frequency when the exhaust temperature is less than or equal to the first exhaust temperature.

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

[0014] Optionally, the gas supply requirement is determined based on the evaporator coil temperature, including: determining that there is a gas supply requirement when the evaporator coil temperature is lower than the coil temperature threshold; and determining that there is no gas supply requirement when the evaporator coil temperature is greater than or equal to the coil temperature threshold.

[0015] Optionally, after obtaining the compressor's operating frequency, the method further includes: if the compressor's operating frequency is less than a first frequency threshold, determining the refrigerant demand during operation based on the compressor's operating frequency; and adjusting the refrigerant storage in the refrigerant regulating branch based on the refrigerant demand.

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

[0017] Optionally, the refrigerant storage in the refrigerant regulating branch is adjusted according to the refrigerant demand, including: when the refrigerant demand is the 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 to not throttle; and, after a first time interval, controlling 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.

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

[0020] Optionally, controlling the opening of the first control valve and the second control valve includes: determining the opening duration based on the refrigerant demand; and controlling the second control valve to close after the first control valve has been open for the required duration.

[0021] Optionally, after the first control valve has been open for a certain period of time, the method further includes controlling the first control valve to close.

[0022] Optionally, the operating duration is determined based on the refrigerant demand, including: when the refrigerant demand is the second demand, the operating duration is determined as the first duration; when the refrigerant demand is the third demand, the operating duration is determined as the second duration; wherein the first duration is shorter than the second duration.

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

[0024] In some embodiments, the heat exchange circuit includes a compressor, an outdoor heat exchanger, a throttle valve, and an indoor heat exchanger connected in sequence; a refrigerant regulating branch, with its liquid storage end connected to the heat exchange circuit located between the throttle valve and the indoor heat exchanger, and its gas supply end connected to the compressor's return gas port; wherein the refrigerant regulating branch includes: a liquid storage device configured to store refrigerant; a first control valve disposed at the liquid storage end of the refrigerant regulating branch and connected to the liquid storage port of the liquid storage device; a second control valve disposed at the gas supply end of the refrigerant regulating branch and connected to the gas supply port of the liquid storage device; and the aforementioned control device for the heat exchange system.

[0025] In some embodiments, the storage medium stores program instructions that, when executed, perform the control method for the heat exchange system described above.

[0026] The control method, control device, heat exchange system, and storage medium for heat exchange systems provided in this disclosure can achieve the following technical effects:

[0027] The heat exchange system includes a heat exchange loop and a refrigerant regulation branch connected in parallel with the heat exchanger in the heat exchange loop. The refrigerant regulation branch includes a first control valve, a liquid receiver, and a second control valve connected in sequence. Refrigerant in the heat exchange loop can flow to the liquid receiver through the open first control valve, and refrigerant in the liquid receiver can flow to the heat exchange loop through the open second control valve. When the compressor operates at a high frequency, the compressor's discharge temperature or evaporator coil temperature determines whether there is a need for gas replenishment. If there is a need for gas replenishment, the first control valve is opened to store gaseous refrigerant. After a portion of gaseous refrigerant is present in the liquid receiver, the second control valve is opened to replenish the compressor. Based on the compressor's discharge temperature or evaporator coil temperature, it is possible to accurately determine whether the compressor has an excessively high pressure ratio, thus determining whether gas replenishment is needed. This allows for a more accurate determination of when to initiate gas replenishment, thereby better meeting the actual needs of the compressor.

[0028] The above general description and the description below are exemplary and illustrative only and are not intended to limit this application. Attached Figure Description

[0029] One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations and drawings do not constitute a limitation on the embodiments. Elements having the same reference numerals in the drawings are shown as similar elements. The drawings are not to be scaled. And wherein:

[0030] Figure 1 This is a schematic diagram of the structure of a heat exchange system provided in an embodiment of this disclosure;

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

[0032] Figure 3 This is a schematic diagram of a control method for a heat exchange system provided in an embodiment of this disclosure;

[0033] Figure 4 This is a schematic diagram of another control method for a heat exchange system provided in an embodiment of this disclosure;

[0034] Figure 5 This is a schematic diagram of another control method for a heat exchange system provided in an embodiment of this disclosure;

[0035] Figure 6 This is a schematic diagram of another control method for a heat exchange system provided in an embodiment of this disclosure;

[0036] Figure 7 This is a schematic diagram of a control device for a heat exchange system provided in an embodiment of this disclosure;

[0037] Figure 8 This is a schematic diagram of a heat exchange system provided in an embodiment of this disclosure.

[0038] Figure label:

[0039] 100: Heat exchange system; 200: Compressor; 300: Outdoor heat exchanger; 400: throttle valve; 500: Indoor heat exchanger; 600: Refrigerant regulating branch; 700: T-junction 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 exhaust pipe section; 820: Second exhaust pipe section;

[0043] 110: Control device; 70: Processor; 71: Memory; 72: Communication interface; 73: Bus. Detailed Implementation

[0044] To provide a more detailed understanding of the features and technical content of the embodiments of this disclosure, the implementation of the embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. The accompanying drawings are for illustrative purposes only and are not intended to limit the embodiments of this disclosure. In the following technical description, for ease of explanation, several details are used to provide a full understanding of the disclosed embodiments. However, one or more embodiments may still be implemented without these details. In other cases, well-known structures and devices may be simplified in their depiction to simplify the drawings.

[0045] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this disclosure are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this disclosure described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

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

[0047] In this embodiment of the disclosure, the character " / " indicates that the objects before and after it are in an "or" relationship. For example, A / B means: A or B.

[0048] The term "and / or" describes an association 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" can refer to an association or binding relationship. The correspondence between A and B means that there is an association or binding relationship between A and B.

[0050] Combination Figure 1 and Figure 2 As shown in the figure, this disclosure provides a heat exchange system, which includes a heat exchange loop and a refrigerant regulation branch 600.

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

[0052] The refrigerant regulating branch 600 includes a liquid storage end and a gas supply end. The liquid storage end of the refrigerant regulating branch 600 is connected to the heat exchange loop located between the throttle valve 400 and the indoor heat exchanger 500, and the gas supply end of the refrigerant regulating branch 600 is connected to the return gas 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, thus storing the refrigerant within the branch and reducing the amount of refrigerant participating in the heat exchange cycle. This allows for the regulation of the amount of refrigerant participating in the refrigerant cycle within the heat exchange system, improving the rationality of refrigerant charging under different operating conditions and enhancing 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 gas 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 connected in sequence.

[0055] The first control valve 620 is located at the liquid storage end of the refrigerant regulating branch 600 and 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 located between the throttle valve 400 and the indoor heat exchanger 500. In this way, the refrigerant between the throttle valve 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 located at the gas supply end of the refrigerant regulating branch 600 and is connected to the gas supply port of the liquid receiver 610. That is, the gas supply end of the refrigerant regulating branch 600 is connected to the gas supply port of the liquid receiver 610. The refrigerant in the liquid receiver 610 can flow back into the compressor 200, i.e., back into the heat exchange circuit, through the gas supply end of the refrigerant regulating branch 600 and the second control valve 630. This not only increases the amount of refrigerant participating in the heat exchange cycle in the heat exchange circuit but also supplies gas to the compressor 200, increasing the compressor 200's suction and discharge volumes, thereby increasing the heat exchange capacity of the heat exchange system and improving its energy efficiency.

[0057] For example, the second control valve 630 includes an electronic expansion valve. The second control valve 630 is located at the gas supply end of the refrigerant regulating branch 600, which is connected to the return port of the compressor 200. In this way, not only can the refrigerant in the liquid receiver 610 be selectively transferred to the compressor 200 by opening and closing the electronic expansion valve to increase the amount of refrigerant participating in the heat exchange cycle, but the electronic expansion valve can also throttle the refrigerant, converting the liquid refrigerant in the liquid receiver 610 into gaseous refrigerant, which is then supplied to the compressor's return port, increasing the gas supply to the compressor 200.

[0058] Optionally, the refrigeration system further includes a gas-liquid separator disposed at the liquid storage end of the refrigerant regulating branch. The gas-liquid separator has at least three ports. The first port is connected to the liquid storage end of the refrigerant regulating branch, allowing refrigerant to enter the gas-liquid separator from the first port. The second port is connected to the liquid storage device and is configured to input as much gaseous refrigerant as possible into the liquid storage device. The third port is connected to an indoor or outdoor heat exchanger to input liquid refrigerant into the heat exchanger.

[0059] Optionally, the gas-liquid separation device includes a tee pipe 700 configured to separate the refrigerant into gaseous and liquid refrigerant. Specifically, the pipe at the liquid storage end of the refrigerant regulating branch 600 is connected by a first pipe section 710, a second pipe section 720, and a third pipe section 730. The first pipe section 710 is connected to the side near the throttle; the second pipe section 720 is connected to a heat exchanger, which is either an indoor heat exchanger 500 or an outdoor heat exchanger 300; the third pipe section 730 is connected to the refrigerant inlet of the liquid storage device, allowing gaseous refrigerant to enter the liquid storage device through the third pipe. This allows as much gaseous refrigerant as possible to flow into the liquid storage device during gas replenishment.

[0060] Optionally, the third pipe section 730 is located above the second pipe section 720, and there is an 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 throttling device 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. The third pipe section 730 hinders the continued flow of the refrigerant, causing the refrigerant flow rate to slow down or pause briefly at this connection. Since the third pipe section 730 is located above the second pipe section 720, the gaseous refrigerant in the gas-liquid two-phase refrigerant can flow upwards at this connection to flow into the third pipe section 730, and then into the liquid storage device 610. Meanwhile, the liquid refrigerant in the gas-liquid two-phase refrigerant can flow downwards under its own gravity to flow into the second pipe section 720, and then into the heat exchanger to continue the heat exchange cycle.

[0061] Furthermore, the opening of the bend faces upward, and the angle of the bend ranges from 30 degrees to 70 degrees.

[0062] In this optional embodiment, the bend between the first pipe section 710 and the third pipe section 730 opens upwards, and the angle of the bend ranges from 30 degrees to 70 degrees. That is, the bend between the first pipe section 710 and the third pipe section 730 is smaller than the bend between the first pipe section 710 and the second pipe section 720. Thus, when refrigerant flows into the tee pipe 700 along the first pipe section 710, the refrigerant's tendency to move along the second pipe section 720 is greater than its tendency to move along the first pipe section 710, allowing more refrigerant to still flow into the second pipe section 720 and into the heat exchanger, thereby achieving normal heat exchange circulation in the heat exchange circuit.

[0063] For example, the angle between the first pipe section 710 and the third pipe section 730 can 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 section 720 to the total amount of refrigerant flowing into the first pipe section 710 is inversely proportional to the angle of the bend. The smaller the angle of the bend, the larger the amount of refrigerant flowing into the second pipe section 720; the larger the angle of the bend, the smaller the amount of refrigerant flowing into the second pipe section 720.

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

[0065] Optionally, the refrigerant outlet of the liquid storage tank is located at the upper end of the tank, and the refrigerant inlet is located at the lower end. This helps to improve the separation degree between gaseous and liquid refrigerant within the tank.

[0066] Furthermore, along the axial direction of the liquid storage tank, 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 ranges from 0 to 0.1.

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

[0068] Optionally, along the axial direction of the liquid storage tank, 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 ranges from 0 to 0.1.

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

[0070] Optionally, the refrigerant inlet of the storage tank is located on the bottom wall of the storage tank, and the refrigerant outlet of the storage tank is located at the upper end of the circumferential side wall of the storage tank. Thus, when the refrigerant flows into the storage tank, it tends to move along the axial direction of the storage tank. When the refrigerant flows out of the storage tank, it flows radially. Due to the impact of the refrigerant within the three-way pipe 700, not only can gaseous refrigerant flow into the storage tank through the third pipe section 730, but a small amount of liquid refrigerant can also enter the storage tank through the third pipe section 730. During the inflow and outflow of the storage tank, the flow direction of the refrigerant changes, increasing the storage time of the same refrigerant within the storage tank, thereby improving the gas-liquid separation degree of the refrigerant entering the storage tank and increasing the dryness of the refrigerant flowing out of the storage tank's refrigerant outlet.

[0071] Optionally, the refrigerant inlet of the storage tank is located at the lower end of the circumferential sidewall of the storage tank, and the refrigerant outlet of the storage tank is located on the top wall of the storage tank. Thus, when the refrigerant flows into the storage tank, it tends to move radially along the tank. When the refrigerant flows out of the storage tank, it flows axially. Due to the impact of the refrigerant within the three-way pipe 700, not only can gaseous refrigerant flow into the storage tank through the third pipe section 730, but a small amount of liquid refrigerant can also enter the storage tank through the third pipe section 730. During the inflow and outflow of the storage tank, the flow direction of the refrigerant changes, increasing the storage time of the same refrigerant within the storage tank, thereby improving the gas-liquid separation degree of the refrigerant entering the storage tank and increasing the dryness of the refrigerant flowing out of the storage tank's outlet.

[0072] Optionally, the liquid storage device 610 includes a liquid storage tank, the ratio of the inner diameter of the liquid storage tank to the inner diameter of the third pipe section 730 ranging from 5 to 10. Thus, when the refrigerant in the third pipe section 730 enters the liquid storage tank, the space increases, the pressure decreases, and some of the liquid refrigerant becomes gaseous refrigerant, thereby increasing the content of gaseous refrigerant in the liquid storage tank. For example, the ratio of the inner diameter of the liquid storage tank to the inner diameter of the third pipe section 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 outlet pipe section, comprising a first outlet pipe section 810 and a second outlet pipe section 820 connected to each other. The first outlet pipe section 810 is connected to the refrigerant outlet of the liquid storage tank, and the inner diameter of the second outlet pipe section 820 is smaller than that of the first outlet pipe section 810. Thus, 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 outlet pipe section 810 and the second outlet pipe section 820. The smaller inner diameter of the second outlet pipe section 820 allows it to act as a throttling device, preventing the small amount of liquid refrigerant mixed in with the gaseous refrigerant flowing out of the refrigerant outlet of the liquid storage tank from becoming a two-phase gas-liquid refrigerant. This further improves the dryness of the gaseous refrigerant flowing out of the refrigerant outlet of the liquid storage tank and enhances 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 outlet pipe section 810 to the inner diameter of the second outlet pipe section 820 is in the range of 3.8 to 5.4. This allows the second outlet pipe section 820 to throttle the small amount of liquid refrigerant mixed in with the gaseous refrigerant when the gaseous refrigerant flows through the first outlet pipe section 810 and the second outlet pipe section 820, thereby improving the gas-liquid separation effect.

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

[0076] Optionally, the aforementioned gas-liquid separation device is configured to replace the portion of the pipe upstream of the liquid storage device in the refrigerant regulating branch. That is, the refrigerant flows through the liquid storage device before entering the liquid storage device itself.

[0077] Optionally, the gas-liquid separator and the upstream section of the liquid storage device are connected in parallel, and the two flow paths can be controlled independently. This configuration allows the gas-liquid separator to be opened only when compressor gas replenishment is needed, thus storing as much gas as possible. During normal liquid storage, the flow path of the ordinary pipe is opened, allowing the refrigerant to directly enter the liquid storage device.

[0078] Optionally, in other embodiments, the refrigerant regulating branch of the heat exchange system is further equipped with a flash evaporator. The flash evaporator is located between the first control valve and the second control valve. Further, it can be located between the first control valve and the liquid storage device. In this way, after the refrigerant enters the flash evaporator, due to the sudden pressure drop, a portion of the liquid refrigerant will turn into gaseous refrigerant. This arrangement helps to increase the dryness of the gaseous refrigerant used for gas replenishment, reduces the risk of liquid refrigerant entering the compressor during the gas replenishment process and causing liquid slugging, thereby improving the reliability of compressor operation.

[0079] The heat exchange system also includes a processor. The processor is configured to determine the gas replenishment requirement based on the compressor's discharge temperature or the evaporator coil temperature when the compressor's operating frequency is greater than or equal to a first frequency threshold; and, upon receiving a gas replenishment requirement, to control the operation of a first control valve and a second control valve to achieve gas replenishment. In this way, when the compressor is under heavy load, the gas replenishment requirement is determined by the compressor's discharge temperature or the evaporator coil temperature, and timely gas replenishment is achieved, thereby ensuring the compressor's performance.

[0080] Combination Figure 1 and Figure 2 The heat exchange system shown in this disclosure provides a control method for the heat exchange system. Combined with... Figure 3 As shown, the control method for the heat exchange system includes:

[0081] S301, the processor obtains the compressor's operating frequency.

[0082] S302, when the compressor's operating frequency is greater than or equal to the first frequency threshold, the processor determines the gas replenishment requirement based on the compressor's exhaust temperature or evaporator coil temperature.

[0083] Here, the evaporator coil temperature is the coil temperature on the evaporator side, which is also the coil temperature of the heat exchanger that serves as the evaporator.

[0084] S303, when there is a need for air replenishment, the processor controls the first control valve to open to the first degree.

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

[0086] Here, after the processor determines the gas supply requirement based on the compressor's exhaust temperature or the evaporator coil temperature, both the first and second control valves remain closed when there is no gas supply requirement.

[0087] The control method for a heat exchange system provided in this disclosure determines whether there is a need for gas replenishment when the compressor operates at a high frequency, based on the compressor's discharge temperature or the evaporator coil temperature. If a gas replenishment need exists, the first control valve is opened to store gaseous refrigerant. After a portion of the gaseous refrigerant is present in the liquid storage device, the second control valve is opened to replenish the compressor. By accurately determining whether the compressor has an excessively high pressure ratio based on the compressor's discharge temperature or the evaporator coil temperature, the need for gas replenishment can be determined. This allows for more accurate timing of gas replenishment, better meeting the actual needs of the compressor.

[0088] A high compressor operating frequency indicates a heavy current load, suggesting that the air conditioner's heat exchange capacity may have decreased, necessitating the activation of gas injection to enhance its performance. Conversely, a low compressor operating frequency indicates a lighter load, with sufficient heat exchange capacity to meet current operational needs. Therefore, determining gas injection requirements only when the compressor frequency is high reduces unnecessary judgment processes.

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

[0090] Optionally, the first opening degree can range from 80 to 200 steps. This limits the valve opening to a smaller value, making it easier to control the gas replenishment process. If the valve is opened directly to a larger opening degree, more liquid refrigerant will enter. At this time, the proportion of liquid refrigerant in the refrigerant flowing through the second control valve will increase, which can easily cause liquid slugging and affect the reliability of the compressor.

[0091] Optionally, the value of the second opening can range from 80 to 200 steps.

[0092] Optionally, the first frequency threshold can be in the range of 25Hz to 35Hz, for example, 30Hz.

[0093] Combination Figure 4 As shown in the embodiments of this disclosure, another control method for a heat exchange system is provided, including:

[0094] S401, the processor obtains the compressor's operating frequency.

[0095] S402, when the compressor's operating frequency is greater than or equal to the first frequency threshold and less than the second frequency threshold, the processor determines the gas replenishment requirement based on the compressor's exhaust temperature.

[0096] S403: When the compressor's operating frequency is greater than or equal to the second frequency threshold, the processor determines the gas supply requirement based on the evaporator coil temperature.

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

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

[0099] If the compressor's operating frequency is greater than or equal to the second frequency threshold, it indicates that the compressor is operating under a higher load and is likely in a high-load state, which may indicate a need for gas replenishment. Even before the compressor's operating frequency reaches the second frequency threshold, a gas replenishment requirement may have already been identified, and the gas replenishment process has been initiated. This gas replenishment process has a significant impact on the exhaust temperature. Therefore, when the compressor's operating frequency is greater than or equal to the second frequency threshold, using the evaporator coil temperature as the criterion can avoid interference caused by the gas replenishment process and more accurately reflect the current actual gas replenishment demand.

[0100] Optionally, the second frequency threshold can be in the range of 50Hz to 70Hz. For example, it can be 50Hz, 55Hz, 60Hz, 65Hz or 70Hz.

[0101] Optionally, the processor determines the gas replenishment requirement based on the compressor's discharge temperature, including: if the discharge temperature is higher than the first discharge temperature, the processor determines that there is a gas replenishment requirement. If the discharge temperature is too high, it indicates that the pressure ratio is too high, and the compressor needs to be replenished with gas. Therefore, the gas replenishment requirement can be accurately determined based on the discharge temperature.

[0102] Optionally, the processor determines the gas replenishment requirement based on the compressor's discharge temperature, and further includes: when the discharge temperature is less than or equal to a first discharge temperature, the processor determines the gas replenishment requirement based on the compressor's operating frequency. The compressor's operating frequency reflects the compressor's current operating load; therefore, further determining whether there is a gas replenishment requirement based on the compressor's operating frequency, in addition to the discharge temperature, can improve the accuracy of the gas replenishment requirement determination.

[0103] Optionally, the first exhaust temperature can range from 45°C to 55°C. For example, it can be 50°C.

[0104] Optionally, when the exhaust temperature is less than or equal to a first exhaust temperature, the processor determines the gas replenishment requirement based on the compressor's operating frequency, including: when the compressor's operating frequency is greater than a first frequency threshold and less than or equal to a second frequency threshold, the processor determines that there is no gas replenishment requirement; when the compressor's operating frequency is greater than the second frequency threshold, the processor determines that there is a gas replenishment requirement.

[0105] Alternatively, the processor determines the gas injection requirement based on the exhaust temperature, including: if the exhaust temperature is higher than the first exhaust temperature, the processor determines that there is a gas injection requirement; if the exhaust temperature is lower than or equal to the first exhaust temperature, the processor determines that there is no gas injection requirement. If the exhaust temperature is too high, it indicates that there is an excessively high pressure ratio, requiring gas injection to the compressor. Therefore, the gas injection requirement can be determined based on 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 gas replenishment, after the processor controls the second control valve to open to the second opening degree, the control method for the heat exchange system further includes: the processor obtaining the real-time exhaust temperature; and when the exhaust temperature is less than the first exhaust temperature and the compressor operating frequency is less than or equal to a second frequency threshold, the processor controlling the first and second control valves to close to stop gas replenishment. Here, determining the end time of the gas replenishment process by jointly using the exhaust temperature and the compressor operating frequency ensures that the gas replenishment process is fully carried out, guaranteeing the gas replenishment effect and thus ensuring the compressor performance. Specifically, if the compressor operating frequency is greater than the second frequency threshold, it indicates that the compressor's operating load is high; in this case, gas replenishment is beneficial to improving the compressor's performance.

[0107] Optionally, after the processor controls the second control valve to open to a second opening degree, the control method for the heat exchange system further includes: the processor adjusting the opening degree of the second control valve according to the real-time exhaust temperature to maintain the exhaust temperature within a target temperature range. The upper temperature threshold of this target temperature range is lower than the first exhaust temperature. In this way, by controlling the opening degree of the second control valve to control the amount of supplementary gas, the supplementary gas process more accurately meets real-time requirements.

[0108] Optionally, the processor determines the gas replenishment requirement based on the evaporator coil temperature, including: if the evaporator coil temperature is below a coil temperature threshold, the processor determines that there is a gas replenishment requirement; if the evaporator coil temperature is greater than or equal to the coil temperature threshold, the processor determines that there is no gas replenishment requirement. If the evaporator coil temperature is low, it indicates that the pressure at the evaporator coil is low, the load is high, and the pressure ratio is high, thus requiring gas replenishment.

[0109] Combination Figure 5 As shown in the embodiments of this disclosure, another control method for a heat exchange system is provided, including:

[0110] S501, the processor obtains the compressor's operating frequency.

[0111] S502, the processor determines whether the compressor frequency is greater than or equal to the first frequency threshold.

[0112] If yes, the processor executes steps S503 and S504; otherwise, the processor executes steps S505 and S506.

[0113] The S503 processor determines the gas injection requirement based on the compressor's exhaust temperature or the evaporator coil temperature.

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

[0115] The S505 processor determines the refrigerant demand during operation based on the compressor's operating frequency.

[0116] S506, the processor adjusts the refrigerant storage in the refrigerant regulating branch according to the refrigerant demand.

[0117] Using the control method for a heat exchange system provided in this disclosure, if the compressor frequency is greater than or equal to a first frequency threshold, it indicates that the compressor is operating under a high load. In this case, the compressor's refrigerant supply requirement is assessed, and refrigerant supply is performed when there is a supply requirement, thereby ensuring the compressor's operating performance. If the compressor's operating frequency is less than the first frequency threshold, it indicates that the compressor is operating under a low load. In this case, the actual refrigerant required by the compressor is relatively small. Therefore, the refrigerant demand is further determined, and the refrigerant storage in the refrigerant regulation branch is adjusted according to the refrigerant demand. This allows for the adjustment of the amount of refrigerant participating in the heat exchange cycle based on actual operating needs, thereby improving the performance of the heat exchange system. In this way, the actual demand of the compressor can be assessed based on its operating conditions, and operations such as refrigerant supply and refrigerant storage can be performed to ensure the performance of the heat exchange system.

[0118] Combination Figure 6 As shown in the embodiments of this disclosure, another control method for a heat exchange system is provided, including:

[0119] S601, the processor obtains the compressor's operating frequency.

[0120] S602, the processor determines whether the compressor frequency is greater than or equal to the first frequency threshold.

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

[0122] The S603 processor determines the gas injection requirement based on the compressor's exhaust temperature or the evaporator coil temperature.

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

[0124] S605, the processor determines whether the compressor's operating frequency is greater than the 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 the refrigerant demand as the primary 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 refrigerant demand is less than the initial demand.

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

[0130] In this way, the refrigerant demand is determined based on the compressor's operating frequency. If the refrigerant demand is higher than the initial demand, the first and second control valves are kept closed to prevent refrigerant storage, resulting in the highest refrigerant level in the heat exchange circuit. If the refrigerant demand is lower than the initial demand, the first and second control valves are opened to allow some refrigerant to be stored in the refrigerant regulating branch. This allows the amount of refrigerant in the refrigerant regulating branch to be adjusted according to actual demand, thereby regulating the amount of refrigerant participating in the heat exchange cycle and improving the performance of the heat exchange system.

[0131] Optionally, the processor controls the opening of the first and second control valves, including: the processor controls the throttle to not throttle, and after a first time interval, controls the opening of the first and second control valves, with the opening degree of the first control valve being greater than that of the second control valve. In this way, in conjunction with the low-pressure traction at the compressor's suction end, the refrigerant in the condenser can directly enter the liquid receiver, achieving refrigerant storage.

[0132] Specifically, the first control valve and the second control valve can be solenoid valves. More specifically, the first control valve and the second control valve can be proportional solenoid valves, which allows direct control of the opening degree of the first control valve and the second control valve.

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

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

[0135] Optionally, when the compressor's operating frequency is less than or equal to a third frequency threshold, the processor determines that the refrigerant demand is less than the first demand, including: when the compressor's operating frequency is less than or equal to the third frequency threshold but greater than a fourth frequency threshold, the processor determines that the refrigerant demand is the second demand; when the compressor's operating frequency is less than or equal to the fourth frequency threshold, the processor determines that the refrigerant demand is the third demand. Wherein, 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 opening of the first and second control valves, including: the processor determining the opening duration based on the refrigerant demand. After the first control valve has been open for its designated duration, the processor controls the second control valve to close. Here, after the second control valve closes, one end of the refrigerant regulating branch is blocked. This immediately prevents refrigerant from flowing into the heat exchange circuit from the second control valve. Simultaneously, due to the pressure, the refrigerant will stop flowing into the liquid storage device within a short time, and the liquid storage process in the liquid storage device will cease.

[0137] Optionally, the processor determines the operating duration based on the refrigerant demand, including: when the refrigerant demand is the second demand level, the processor determines the operating duration to be a first duration; when the refrigerant demand is the third demand level, the processor determines the operating duration to be a second duration. The first duration is shorter than the second duration. Thus, when the refrigerant demand is low, a longer operating duration is used, increasing the amount of refrigerant in the refrigerant regulation branch, thereby reducing the amount of refrigerant in the heat exchange loop, and ensuring that the amount of refrigerant participating in heat exchange matches the actual heat exchange demand.

[0138] For example, if the compressor's operating frequency 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 volume in the refrigerant regulation branch is half of the total refrigerant storage volume. In this case, the operating duration is determined to be t1. If the compressor's operating frequency is less than or equal to the fourth frequency threshold, the processor determines that the refrigerant demand is partial refrigerant, and the refrigerant storage volume in the refrigerant regulation branch is the total refrigerant storage volume. In this case, the operating duration is determined to be the sum of t1 and t2.

[0139] Optionally, t2 > t1. Compared to setting t2 = t1, setting a larger t2 for delay control helps ensure that as much refrigerant as possible is stored in the refrigerant regulation branch, making the amount of refrigerant stored in the refrigerant regulation branch closer to the total refrigerant storage volume.

[0140] Optionally, after the first control valve has been open for the required duration, the processor further controls the first control valve to close. In this way, both the first and second control valves are closed, enabling a rapid halt to the liquid storage process of the liquid storage device.

[0141] Optionally, after the first control valve has been open for its designated opening time, the control method for the heat exchange system further includes: the processor controlling the throttle to resume throttling. This automatically returns the system to normal heat exchange after the liquid storage process ends.

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

[0143] Furthermore, the logic instructions in the aforementioned memory 71 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium.

[0144] The memory 71, as a computer-readable storage medium, can be used to store software programs and computer-executable programs, such as program instructions / modules corresponding to the methods in the embodiments of this disclosure. The processor 70 executes functional applications and data processing by running the program instructions / modules stored in the memory 71, thereby implementing the control method for the heat exchange system in the above embodiments.

[0145] The memory 71 may include a program storage area and a data storage area. The program storage area may store the operating system and application programs required for at least one function; the data storage area may store data created based on the use of the terminal device. Furthermore, the memory 71 may include high-speed random access memory and may also include non-volatile memory.

[0146] Combination Figure 8 As shown, this disclosure provides a heat exchange system 100, including a heat exchange system body and the aforementioned 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 herein 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. Those skilled in the art will understand that the control device 110 for the heat exchange system can be adapted to feasible product bodies to achieve other feasible embodiments.

[0147] This disclosure provides a computer-readable storage medium storing computer-executable instructions configured to execute the above-described control method for a heat exchange system.

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

[0149] The technical solutions of this disclosure can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes one or more instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the method described in this disclosure. The aforementioned storage medium can be a non-transitory storage medium, including: a USB flash drive, a portable hard drive, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and other media capable of storing program code; it can also be a transient storage medium.

[0150] The foregoing description and accompanying drawings fully illustrate embodiments of this disclosure to enable those skilled in the art to practice them. Other embodiments may include structural, logical, electrical, procedural, and other changes. The embodiments represent only possible variations. Individual components and functions are optional unless explicitly required, and the order of operation may vary. Parts and features of some embodiments may be included in or replace parts and features of other embodiments. Moreover, the terminology used in this application is for describing embodiments only and is not intended to limit the claims. As used in the description of embodiments and claims, the singular forms “a,” “an,” and “the” are intended to equally include the plural forms unless the context clearly indicates otherwise. Similarly, the term “and / or” as used in this application means including one or more of the associated listed items and all possible combinations thereof. Additionally, when used in this application, the term "comprise" and its variations "comprises" and / or "comprising" refer to the presence of stated features, integrals, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or groups thereof. Without further limitations, an element defined by the phrase "comprises a..." does not exclude the presence of other identical elements in the process, method, or apparatus that includes said element. In this document, each embodiment may focus on the differences from other embodiments, and similar or identical parts between embodiments can be referred to mutually. For methods, products, etc., disclosed in the embodiments, if they correspond to the method section disclosed in the embodiments, the relevant parts can be referred to the description of the method section.

[0151] Those skilled in the art will recognize that the units and algorithm steps of the various examples 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 implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the embodiments of this disclosure. Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

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

[0153] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to embodiments of this disclosure. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. In some alternative implementations, the functions marked in the blocks may occur in a different order than that shown in the drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. In the descriptions corresponding to the flowcharts and block diagrams in the accompanying drawings, the operations or steps corresponding to different blocks may also occur in a different order than disclosed in the description, and sometimes there is no specific order between different operations or steps. For example, two consecutive operations or steps may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. Each block in a block diagram and / or flowchart, and combinations of blocks in a block diagram and / or flowchart, can be implemented using a dedicated hardware-based system that performs the specified function or action, or using 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 includes: The heat exchange circuit includes a compressor, an outdoor heat exchanger, a throttle valve, and an indoor heat exchanger connected in sequence. The refrigerant regulating branch has its liquid receiver connected to the heat exchange circuit located between the throttle and the indoor heat exchanger, and its gas supply connected to the compressor's return port. The refrigerant regulation branch includes: The liquid storage device is configured to store refrigerant; The first control valve is located 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 located at the gas supply end of the refrigerant regulating branch and is connected to the gas supply port of the liquid storage device. A gas-liquid separation device is installed at the liquid storage end of the refrigerant regulating branch; the gas-liquid separation device includes a three-way pipe, the first section of the three-way pipe is connected to the side near the throttle, the second section is connected to the heat exchanger, and the third section is connected to the refrigerant inlet of the liquid storage device. The third section is located above the second section, and the third section and the first section form an upward-opening bend. The control method includes: Obtain the operating frequency of the compressor; When the compressor's operating frequency is greater than or equal to the first frequency threshold, the gas injection requirement is determined based on the compressor's discharge temperature or the evaporator coil temperature. When there is a need for gas replenishment, the first control valve is opened to the first opening degree; and, After the first time interval, the second control valve is opened to the second opening degree. After the second control valve is opened to the second opening degree, the opening degree of the second control valve is adjusted according to the real-time exhaust temperature so that the exhaust temperature is maintained within the target temperature range; the upper temperature threshold of the target temperature range is less than the first exhaust temperature.

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

3. The control method according to claim 2, characterized in that, The gas supply requirement is determined based on the compressor's discharge temperature, including: If the exhaust temperature is higher than the first exhaust temperature, it is determined that there is a need for supplemental air.

4. The control method according to claim 3, characterized in that, Determining the gas supply requirement based on the compressor's exhaust temperature also includes: When the exhaust temperature is less than or equal to the first exhaust temperature, the gas replenishment requirement is determined based on the compressor's operating frequency.

5. The control method according to claim 2, characterized in that, The gas supply requirement is determined based on the evaporator coil temperature, including: When the evaporator coil temperature is lower than the coil temperature threshold, it is determined that there is a need for gas replenishment. If the evaporator coil temperature is greater than or equal to the coil temperature threshold, it is determined that there is no need for gas replenishment.

6. The control method according to any one of claims 1 to 5, characterized in that, After obtaining the compressor's operating frequency, the following is also included: When the compressor's operating frequency is less than the first frequency threshold, the refrigerant demand during operation is determined based on the compressor's operating frequency. Adjust the refrigerant storage in the refrigerant regulating branch according to the refrigerant demand.

7. The control method according to claim 6, characterized in that, The refrigerant demand during operation is determined based on the compressor's operating frequency, including: When the compressor's operating frequency is greater than the third frequency threshold, the refrigerant demand is determined as the first demand. If the compressor's operating frequency is less than or equal to the third frequency threshold, it is determined that the refrigerant demand is less than the first demand. The third frequency threshold is less 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, when running the program instructions, the control method for a heat exchange system as described in any one of claims 1 to 7.

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

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

Images