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

Abstract

The application relates to the technical field of heat exchange systems, and discloses a control method and device for a heat exchange system and the heat exchange system. The heat exchange system comprises a heat exchange circuit and a refrigerant adjusting branch. The heat exchange circuit comprises a compressor, an outdoor heat exchanger, a throttling device and an indoor heat exchanger which are connected in sequence. The refrigerant adjusting branch is connected with the heat exchange circuit between the throttling device and the indoor heat exchanger at a liquid storage end, and the refrigerant adjusting branch is connected with a return gas port of the compressor at a gas supplement end. The control method comprises the following steps: acquiring a compressor operating parameter; and adjusting the refrigerant storage capacity of the refrigerant adjusting branch according to the compressor operating parameter. According to the embodiment, the refrigerant storage capacity of the refrigerant adjusting branch can be adjusted according to the operating parameter of the compressor, so that the rationality of refrigerant charging of the heat exchange system under different working conditions is improved, and the performance of the heat exchange system is improved.

Description

Technical Field

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

[0002] In an air conditioning system, refrigerant circulates within the system to achieve cooling or heating operation. The optimal refrigerant circulation volume required by the heat exchange system varies depending on the load of the air conditioner in cooling or heating mode. However, the refrigerant charge is fixed for the heat exchange system. When the outside temperature is high during cooling or low during heating, the rated refrigerant volume may cause the air conditioning system to operate under overload, resulting in poor cooling or heating performance. Conversely, when the outside temperature is low during cooling or high during heating, the air conditioning system operates at low load, and the refrigerant volume may be excessive. This excess refrigerant does not play a role in heat exchange during system operation, leading to low operating efficiency of the temperature control unit and preventing the heat exchange system from achieving its optimal performance.

[0003] In related technologies, the refrigerant in the heat exchange system is generally regulated by adjusting the opening of the throttle valve. This involves depressurizing or cooling the refrigerant, or pressurizing or heating it, so that the refrigerant condition meets the needs of the indoor heat exchanger and the heat exchange system is in a relatively optimal state.

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

[0005] Because the throttle has limited opening adjustment capability and a small adjustment range, when the refrigerant required by the heat exchange system varies greatly, the throttle cannot meet the refrigerant adjustment requirements, resulting in poor performance of the heat exchange system.

[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 and apparatus for a heat exchange system, and a heat exchange system, to adjust the amount of refrigerant participating in the heat exchange cycle in the heat exchange system and improve the performance of the heat exchange system.

[0009] According to an embodiment of the first aspect of this application, a control method for a heat exchange system is provided. The heat exchange system includes a heat exchange loop and a refrigerant regulation branch. The heat exchange loop includes a compressor, an outdoor heat exchanger, a throttle valve, and an indoor heat exchanger connected in sequence. The liquid storage end of the refrigerant regulation branch is connected to the heat exchange loop located between the throttle valve and the indoor heat exchanger. The gas supply end of the refrigerant regulation branch is connected to the gas return port of the compressor. The control method includes: acquiring compressor operating parameters; and adjusting the refrigerant storage in the refrigerant regulation branch according to the compressor operating parameters.

[0010] In some optional embodiments, the compressor's operating parameters include the compressor's operating load; adjusting the refrigerant storage in the refrigerant regulating branch according to the compressor's operating parameters includes: reducing the refrigerant storage in the refrigerant regulating branch when the compressor's operating load is high; and increasing the refrigerant storage in the refrigerant regulating branch when the compressor's operating load is low.

[0011] In some optional embodiments, the refrigerant regulating branch includes a liquid storage solenoid valve, a liquid storage device, and a gas replenishment solenoid valve connected in sequence. The liquid storage solenoid 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 gas replenishment solenoid valve is located at the gas replenishment end of the refrigerant regulating branch and is connected to the gas replenishment port of the liquid storage device. Increasing the refrigerant storage in the refrigerant regulating branch includes: controlling both the liquid storage solenoid valve and the gas replenishment solenoid valve to be open, with the opening degree of the liquid storage solenoid valve being greater than that of the gas replenishment solenoid valve; and / or decreasing the refrigerant storage in the refrigerant regulating branch includes: controlling both the liquid storage solenoid valve and the gas replenishment solenoid valve to be open, with the opening degree of the liquid storage solenoid valve being less than that of the gas replenishment solenoid valve.

[0012] In some optional embodiments, the refrigerant regulating branch includes a liquid receiver solenoid valve, a liquid receiver device, and a gas replenishment solenoid valve connected in sequence. The liquid receiver solenoid valve is located at the liquid receiver end of the refrigerant regulating branch and is connected to the liquid receiver port of the liquid receiver device. The gas replenishment solenoid valve is located at the gas replenishment end of the refrigerant regulating branch and is connected to the gas replenishment port of the liquid receiver device. The compressor's operating parameters include the compressor's operating frequency and the compressor's discharge pressure. Adjusting the refrigerant storage in the refrigerant regulating branch according to the compressor's operating parameters includes: determining a first target opening degree of the gas replenishment solenoid valve based on the compressor's discharge pressure; determining a second target opening degree of the liquid receiver solenoid valve based on the first target opening degree and the compressor's operating frequency; controlling the gas replenishment solenoid valve to operate at the first target opening degree and controlling the liquid receiver solenoid valve to operate at the second target opening degree.

[0013] In some optional embodiments, determining the second target opening of the liquid storage solenoid valve based on the first target opening and the operating frequency of the compressor includes: determining the theoretical liquid storage capacity of the liquid storage device corresponding to the operating frequency of the compressor; obtaining the actual liquid storage capacity of the liquid storage device; and determining the second target opening of the liquid storage solenoid valve based on the difference between the theoretical liquid storage capacity and the actual liquid storage capacity, based on the first target opening.

[0014] In some optional embodiments, determining a second target opening of the liquid storage solenoid valve based on the difference between the theoretical liquid storage volume and the actual liquid storage volume, based on a first target opening, includes: determining the second target opening as a first opening when the first target opening is greater than or equal to a preset opening and the difference in liquid storage volume is greater than or equal to a preset difference in liquid storage volume; determining the second target opening as a second opening when the first target opening is greater than or equal to the preset opening and the difference in liquid storage volume is less than a preset difference in liquid storage volume; determining the second target opening as a third opening when the first target opening is less than the preset opening and the difference in liquid storage volume is greater than or equal to a preset difference in liquid storage volume; and determining the second target opening as a fourth opening when the first target opening is less than the preset opening and the difference in liquid storage volume is less than a preset difference in liquid storage volume; wherein, the first opening is greater than the second opening, the first opening is greater than the third opening, the third opening is greater than the fourth opening, and the second opening is greater than the fourth opening.

[0015] In some optional embodiments, based on the first target opening degree, a second target opening degree of the inlet solenoid valve is determined according to the difference between the theoretical and actual liquid storage volumes, including calculating the second target opening degree as follows:

[0016] S2=k1*ΔD+k2*S1

[0017] Wherein, S2 is the second target opening degree, k1 is the first adjustment coefficient, ΔD is the difference in liquid storage volume, k2 is the second adjustment coefficient, and S1 is the first target opening degree.

[0018] According to an embodiment of the second aspect of this application, a control device for a heat exchange system is provided, including a processor and a memory storing program instructions, the processor being configured to execute the control method for a heat exchange system described in any of the preceding claims when the program instructions are executed.

[0019] According to an embodiment of the third aspect of this application, a heat exchange system is provided, comprising: 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 including a liquid storage end and a gas supply end, the liquid storage end being connected to the heat exchange circuit located between the outdoor heat exchanger and the throttle valve, and the gas supply end being connected to the return gas port of the compressor; and a control device for the heat exchange system as described above.

[0020] In some optional embodiments, the refrigerant regulating branch includes: a liquid storage device; a liquid storage solenoid valve, located at the liquid storage end of the refrigerant regulating branch and connected to the liquid storage port of the liquid storage device; and a gas replenishment solenoid valve, located at the gas replenishment end of the refrigerant regulating branch and connected to the gas replenishment port of the liquid storage device.

[0021] The control method and apparatus for heat exchange systems and the heat exchange systems provided in this disclosure can achieve the following technical effects:

[0022] The heat exchange system includes a heat exchange loop and a refrigerant regulating branch. The liquid storage end of the refrigerant regulating branch is connected to the heat exchange loop between the throttle and the indoor heat exchanger, and the gas supply end of the refrigerant regulating branch is connected to the compressor's return port. In this way, refrigerant in the heat exchange system can enter the refrigerant regulating branch through the liquid storage end, storing the refrigerant within the branch and reducing the amount of refrigerant participating in the heat exchange cycle. Similarly, refrigerant in the refrigerant regulating branch can flow into the heat exchange system through the gas supply end, increasing the amount of refrigerant participating in the heat exchange cycle. Furthermore, the gas supply end of the refrigerant regulating branch can also supply gas to the compressor, increasing the compressor's intake and exhaust volumes, thereby increasing the heat exchange capacity and improving the system's energy efficiency. This embodiment of the present disclosure can obtain the compressor's operating parameters and adjust the refrigerant storage in the refrigerant regulating branch according to these parameters, thereby improving the rationality of refrigerant charging under different operating conditions and enhancing the system's performance.

[0023] The above general description and the description below are exemplary and illustrative only and are not intended to limit this application. Attached Figure Description

[0024] 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:

[0025] Figure 1 This is a schematic flowchart of a control method for a heat exchange system provided in an embodiment of this disclosure;

[0026] Figure 2 This is a schematic flowchart of another control method for a heat exchange system provided in an embodiment of this disclosure;

[0027] Figure 3 This is a schematic flowchart of another control method for a heat exchange system provided in an embodiment of this disclosure;

[0028] Figure 4 This is a schematic diagram of the structure of a heat exchange system provided in an embodiment of this disclosure;

[0029] Figure 5This is a schematic diagram of another heat exchange system provided in an embodiment of this disclosure;

[0030] Figure 6 This is a schematic diagram of the structure of a control device for a heat exchange system provided in an embodiment of this disclosure.

[0031] Figure label:

[0032] 100. Processor; 101. Memory; 102. Communication interface; 103. Bus; 200. Compressor; 300. Outdoor heat exchanger; 400. Throttle valve; 500. Indoor heat exchanger; 600. Refrigerant regulating branch; 610. Liquid receiver; 620. Liquid receiver solenoid valve; 630. Gas makeup solenoid valve; 700. Gas-liquid separator; 800. Gas makeup pipeline. Detailed Implementation

[0033] 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.

[0034] 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.

[0035] In this disclosure, the terms "upper," "lower," "inner," "middle," "outer," "front," and "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for better description of the embodiments of this disclosure and their implementations, and are not intended to limit the indicated devices, elements, or components to having a specific orientation, or to require them to be constructed and operated in a specific orientation. Furthermore, some of the aforementioned terms may be used to indicate other meanings besides orientation or positional relationship; for example, the term "upper" may in some cases indicate a dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in the embodiments of this disclosure according to the specific circumstances.

[0036] Furthermore, the terms "set up," "connect," and "fix" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this disclosure according to the specific circumstances.

[0037] 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.

[0038] It should be noted that, unless otherwise specified, the embodiments and features described in the present disclosure can be combined with each other.

[0039] This disclosure provides a heat exchange system, such as Figure 4 and Figure 5 As shown, the heat exchange system includes a heat exchange loop and a refrigerant regulation branch 600. The heat exchange loop includes a compressor 200, an outdoor heat exchanger 300, a throttle valve 400, and an indoor heat exchanger 500 connected in sequence. The refrigerant regulation branch 600 includes a liquid receiver and a gas supply end. The liquid receiver of the refrigerant regulation 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 regulation branch 600 is connected to the return gas port of the compressor 200.

[0040] The heat exchange system includes a heat exchange loop and a refrigerant regulating branch 600. The liquid storage end of the refrigerant regulating branch 600 is connected to the heat exchange loop 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 gas return port of the compressor 200. In this way, refrigerant in the heat exchange system can enter the refrigerant regulating branch 600 through the liquid storage end, storing the refrigerant within it and reducing the amount of refrigerant participating in the heat exchange cycle. Similarly, refrigerant within the refrigerant regulating branch 600 can flow into the heat exchange system through the gas supply end, increasing the amount of refrigerant participating in the heat exchange cycle. This embodiment can regulate the amount of refrigerant participating in the refrigerant cycle within the heat exchange system, thereby improving the rationality of refrigerant charging under different operating conditions and enhancing the performance of the heat exchange system.

[0041] Furthermore, the gas supply end of the refrigerant regulating branch 600 can also supply gas to the compressor 200, increasing the intake and exhaust volume of the compressor 200, thereby increasing the heat exchange capacity of the heat exchange system and improving the energy efficiency of the heat exchange system.

[0042] Furthermore, the refrigerant regulating branch 600 includes a liquid receiver solenoid valve 620, a liquid receiver device 610, and a gas replenishment solenoid valve 630 connected in sequence. The liquid receiver solenoid valve 620 is located at the liquid receiver end of the refrigerant regulating branch 600 and is connected to the liquid receiver port of the liquid receiver device 610. The gas replenishment solenoid valve 630 is located at the gas replenishment end of the refrigerant regulating branch 600 and is connected to the gas replenishment port of the liquid receiver device 610.

[0043] In this embodiment, the liquid storage solenoid valve 620 is located at the liquid storage end of the refrigerant regulating branch 600, and the liquid storage solenoid 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 loop 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 liquid storage solenoid valve 620, thereby reducing the amount of refrigerant participating in the heat exchange cycle in the heat exchange loop and improving the energy efficiency of the heat exchange system.

[0044] The gas-replenishing solenoid valve 630 is located at the gas-replenishing end of the refrigerant regulating branch 600 and is connected to the gas-replenishing port of the liquid receiver 610. In other words, the gas-replenishing end of the refrigerant regulating branch 600 is connected to the gas-replenishing 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-replenishing end of the refrigerant regulating branch 600 and the gas-replenishing solenoid valve 630. This not only increases the amount of refrigerant participating in the heat exchange cycle in the heat exchange circuit but also replenishes the compressor 200 with gas, 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.

[0045] For example, the gas replenishment solenoid valve 630 includes an electronic expansion valve. The gas replenishment solenoid valve 630 is located at the gas replenishment end of the refrigerant regulating branch 600, which is connected to the return port of the compressor 200. The gas replenishment solenoid valve 630 is an electronic expansion valve. In this way, not only can the opening and closing of the electronic expansion valve selectively transfer the refrigerant in the liquid receiver 610 to the compressor 200, increasing 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 replenishment amount of the compressor 200.

[0046] Optionally, such as Figure 5As shown, the heat exchange system also includes a gas-liquid separator 700 and a return gas pipeline 800, which connects the gas-liquid separator 700 to the return gas port of the compressor 200. The make-up gas end of the refrigerant regulating branch 600 is connected to the first position of the return gas pipeline 800, and the ratio between the length of the pipeline between the first position and the return gas port of the compressor 200 and the total length of the return gas pipeline 800 is greater than or equal to 1 / 4.

[0047] In this embodiment, the return gas pipeline 800 is connected between the gas-liquid separator 700 and the return gas port of the compressor 200. The gas separated by the gas-liquid separator 700 can flow into the return gas port of the compressor 200 through the return gas pipeline 800 to supply gas to the compressor 200. The liquid discharge end of the refrigerant regulating branch 600 is connected to the first position of the return gas pipeline 800, and the refrigerant in the refrigerant regulating branch 600 can be supplied to the return gas port of the compressor 200 through the return gas pipeline 800. Since the gas supply end of the refrigerant regulating branch 600 is equipped with an electronic expansion valve, the refrigerant regulating branch 600 can directly supply gaseous refrigerant to the return gas pipeline 800, increasing the return gas volume of the compressor 200.

[0048] The ratio between the length of the pipe between the first position and the return port of the compressor 200 and the total length of the return pipe 800 is greater than or equal to 1 / 4. For example, this ratio can be 1 / 4, 7 / 24, 1 / 3, 9 / 24, 5 / 12, 11 / 24, 1 / 2, 13 / 24, 7 / 12, 5 / 8, 2 / 3, 17 / 24, 3 / 4, etc.

[0049] Figure 1 This is a schematic flowchart illustrating a control method for a heat exchange system according to an embodiment of this disclosure. This control method for a heat exchange system can be executed in the controller of the heat exchange system.

[0050] S011, the controller obtains the compressor operating parameters.

[0051] S012, based on the compressor operating parameters, the controller adjusts the refrigerant storage in the refrigerant regulating branch.

[0052] In this embodiment, the operating parameters of the compressor can be obtained, and the refrigerant storage in the refrigerant regulation branch can be adjusted according to the operating parameters of the compressor to adjust the amount of refrigerant participating in the heat exchange cycle in the heat exchange loop. This results in different amounts of refrigerant participating in the heat exchange cycle under different operating parameters of the compressor, thereby improving the rationality of the amount of refrigerant participating in the heat exchange cycle under different operating conditions and improving the performance of the heat exchange system.

[0053] In some alternative embodiments, the compressor's operating parameters include the compressor's operating load. Adjusting the refrigerant level in the refrigerant regulating branch based on the compressor's operating parameters includes: reducing the refrigerant level in the refrigerant regulating branch when the compressor is operating at a high load; and increasing the refrigerant level in the refrigerant regulating branch when the compressor is operating at a low load.

[0054] In this embodiment, when the compressor is operating at a high load, the heat exchange capacity of the heat exchange system increases, and the amount of refrigerant required for the heat exchange cycle also increases. At this time, the refrigerant storage in the refrigerant regulating branch can be reduced, allowing the refrigerant to return to the heat exchange loop through the compressor, thereby increasing the amount of refrigerant participating in the heat exchange cycle and improving the performance of the heat exchange system.

[0055] When the compressor operates at a low load, the heat exchange capacity of the heat exchange system decreases. This means the amount of refrigerant involved in the heat exchange cycle can be reduced, allowing the system to meet its heat exchange requirements under low compressor load conditions with less refrigerant. In this case, the refrigerant storage in the refrigerant regulating branch can be increased, reducing the amount of refrigerant involved in the heat exchange cycle and minimizing energy consumption caused by excessive refrigerant involvement, thereby improving the heat exchange performance of the system.

[0056] In some optional embodiments, increasing the refrigerant storage in the refrigerant regulating branch includes: the controller controls both the liquid receiver solenoid valve and the gas injection solenoid valve to be open, and the opening degree of the liquid receiver solenoid valve is greater than that of the gas injection solenoid valve. Decreasing the refrigerant storage in the refrigerant regulating branch includes: the controller controls both the liquid receiver solenoid valve and the gas injection solenoid valve to be open, and the opening degree of the liquid receiver solenoid valve is less than that of the gas injection solenoid valve.

[0057] In this embodiment, the liquid storage end of the refrigerant regulating branch is equipped with a liquid storage solenoid valve, and the gas supply end of the refrigerant regulating branch is equipped with a gas supply solenoid valve. When increasing the refrigerant storage in the refrigerant regulating branch, the liquid storage solenoid valve and the gas supply solenoid valve can be adjusted so that both are open, with the opening degree of the liquid storage solenoid valve being greater than that of the gas supply solenoid valve. This results in the amount of refrigerant flowing through the liquid storage solenoid valve being greater than that flowing through the gas supply solenoid valve, thereby storing refrigerant in the liquid storage device and increasing the refrigerant storage in the refrigerant regulating branch. When decreasing the refrigerant storage in the refrigerant regulating branch, the liquid storage solenoid valve and the gas supply solenoid valve can also be adjusted so that both are open, with the opening degree of the liquid storage solenoid valve being less than that of the gas supply solenoid valve. This results in the amount of refrigerant flowing through the liquid storage solenoid valve being less than that flowing through the gas supply solenoid valve, thus increasing the outflow of refrigerant from the liquid storage device compared to the inflow, thereby reducing the amount of refrigerant in the liquid storage device. Furthermore, both increasing and decreasing the refrigerant quantity in the refrigerant regulating branch will open the gas replenishment solenoid valve, increasing the compressor's return and discharge volume and improving the compressor's operating efficiency.

[0058] Figure 2 This is a schematic flowchart of a control method for a heat exchange system provided in an embodiment of this disclosure.

[0059] S021, the controller obtains the compressor operating parameters.

[0060] The operating parameters of a compressor include its operating frequency and its discharge pressure.

[0061] Optionally, if the compressor's operating frequency is greater than or equal to a first preset frequency, the compressor is determined to be under high operating load. If the compressor's operating frequency is less than a second preset frequency, the compressor is determined to be under low operating load. Further, if the compressor's operating frequency is less than the first preset frequency and greater than or equal to the second preset frequency, the compressor is determined to be under normal operating load.

[0062] Optionally, when the compressor's operating load is at its normal operating load, the refrigerant storage in the refrigerant regulating branch remains constant, and this refrigerant storage is the first refrigerant storage; when the compressor's operating load is at its high operating load, the refrigerant storage in the refrigerant regulating branch is the second refrigerant storage; and when the compressor's operating load is at its low operating load, the refrigerant storage in the refrigerant regulating branch is the third refrigerant storage. The third refrigerant storage is greater than the first refrigerant storage, and the first refrigerant storage is greater than the second refrigerant storage.

[0063] S022, Based on the compressor's discharge pressure, the controller determines the first target opening degree of the supplementary air solenoid valve.

[0064] The controller can obtain the compressor's discharge pressure and determine the first target opening degree of the gas supply solenoid valve based on the compressor's discharge pressure, thereby controlling the amount of gas supplied to the compressor from the refrigerant regulating branch.

[0065] The compressor's discharge pressure can be adjusted by the compressor's speed and return gas volume. In this embodiment, the first target opening of the gas replenishment solenoid valve is adjusted by regulating the compressor's discharge pressure, thus regulating the compressor's return gas volume. This allows the compressor's discharge pressure to be increased without increasing the compressor's speed, ensuring that the compressor's discharge pressure meets the first preset discharge pressure requirement. This reduces the frequency of compressor speed changes, extends the compressor's lifespan, and saves energy.

[0066] Optionally, if the compressor's discharge pressure is less than or equal to the first preset discharge pressure and greater than the second preset discharge pressure, the first target opening degree is determined to be the fifth opening degree.

[0067] When the compressor's discharge pressure is less than or equal to the second preset discharge pressure, the first target opening degree is determined to be the sixth opening degree. The sixth opening degree is greater than the fifth opening degree.

[0068] Optionally, when the compressor's discharge pressure is less than or equal to a first preset discharge pressure, the first target opening degree is negatively correlated with the compressor's discharge pressure. The lower the compressor's discharge pressure, the larger the value of the first target opening degree. This further increases the compressor's return gas volume and raises the compressor's discharge pressure.

[0069] S023, based on the first target opening degree, the controller determines the second target opening degree of the liquid receiver solenoid valve according to the operating frequency of the compressor.

[0070] The controller can obtain the compressor's operating frequency and increase or decrease the refrigerant storage in the refrigerant regulating branch according to the compressor's operating frequency. The second target opening degree of the liquid receiver solenoid valve is determined based on the first target opening degree of the gas injection solenoid valve and the compressor's operating frequency. This allows the gas injection solenoid valve to increase the compressor's return gas volume, while the liquid receiver solenoid valve can also adjust the refrigerant storage in the refrigerant regulating branch to increase or decrease the refrigerant storage in the liquid receiver according to the compressor's operating frequency.

[0071] S024, the controller controls the gas replenishment solenoid valve to operate at the first target opening degree, and controls the liquid storage solenoid valve to operate at the second target opening degree.

[0072] Figure 3 This is a schematic flowchart of a control method for a heat exchange system provided in an embodiment of this disclosure.

[0073] S031, the controller obtains the compressor operating parameters.

[0074] The operating parameters of a compressor include its operating frequency and its discharge pressure.

[0075] S032, based on the compressor's discharge pressure, the controller determines the first target opening degree of the supplementary gas solenoid valve.

[0076] S033, the controller determines the theoretical liquid storage capacity of the liquid storage device corresponding to the operating frequency of the compressor.

[0077] In this embodiment, the compressor's operating frequency corresponds to its high and low operating loads. When the compressor's operating frequency is greater than or equal to a first preset frequency, the theoretical liquid storage capacity is determined as the first liquid storage capacity. When the compressor's operating frequency is less than a second preset frequency, the theoretical liquid storage capacity is determined as the second liquid storage capacity. When the compressor's operating frequency is less than the first preset frequency but greater than or equal to the second preset frequency, the theoretical liquid storage capacity is determined as the third liquid storage capacity. The second liquid storage capacity is greater than the third liquid storage capacity, and the third liquid storage capacity is greater than the first liquid storage capacity.

[0078] S034, the controller obtains the actual liquid storage volume of the liquid storage device.

[0079] S035, based on the first target opening degree, the controller determines the second target opening degree of the liquid storage solenoid valve according to the difference between the theoretical liquid storage volume and the actual liquid storage volume.

[0080] In this embodiment, the controller can determine the difference between the theoretical and actual liquid storage volume, and determine the opening degree of the liquid storage solenoid valve based on this difference. Furthermore, during the opening of the liquid storage solenoid valve, the refrigerant in the liquid storage device does not only enter through the solenoid valve; it also supplies gas to the compressor through the gas replenishment solenoid valve. Therefore, when adjusting the liquid storage volume difference, the opening degree of the liquid storage solenoid valve must be adjusted based on the first target opening degree of the gas replenishment solenoid valve to reduce the liquid storage volume difference and meet the gas replenishment requirements of the gas replenishment solenoid valve to the compressor.

[0081] Optionally, if the first target opening degree is greater than or equal to the preset opening degree and the difference in liquid storage volume is greater than or equal to the preset difference in liquid storage volume, the controller determines the second target opening degree as the first opening degree.

[0082] If the first target opening degree is greater than or equal to the preset opening degree, and the difference in liquid storage volume is less than the preset difference in liquid storage volume, the controller determines the second target opening degree as the second opening degree.

[0083] If the first target opening degree is less than the preset opening degree and the difference in liquid storage volume is greater than or equal to the preset difference in liquid storage volume, the controller determines the second target opening degree as the third opening degree.

[0084] If the first target opening degree is less than the preset opening degree and the difference in liquid storage volume is less than the preset difference in liquid storage volume, the controller determines the second target opening degree as the fourth opening degree.

[0085] Among them, the first opening is greater than the second opening, the first opening is greater than the third opening, the third opening is greater than the fourth opening, and the second opening is greater than the fourth opening.

[0086] In this embodiment, the liquid storage difference refers to the difference between the theoretical liquid storage volume and the actual liquid storage volume. When the theoretical liquid storage volume is greater than the actual liquid storage volume, the liquid storage difference is positive, indicating that the refrigerant storage volume of the liquid storage device needs to be increased. In this case, the preset liquid storage difference is also positive. Thus, when the liquid storage difference is greater than or equal to the preset liquid storage difference, the refrigerant storage volume in the liquid storage device is less than the refrigerant storage volume in the liquid storage device when the liquid storage difference is less than the preset liquid storage difference.

[0087] When the theoretical refrigerant storage capacity is less than the actual storage capacity, the difference in storage capacity is negative, indicating that the refrigerant storage capacity of the storage device needs to be reduced. In this case, the preset storage capacity difference is also negative. Thus, the refrigerant storage capacity in the storage device when the storage capacity difference is greater than or equal to the preset storage capacity difference is less than the refrigerant storage capacity in the storage device when the storage capacity difference is less than the preset storage capacity difference.

[0088] In this embodiment, the gas replenishment solenoid valve replenishes gas to the compressor, so the refrigerant in the liquid storage device will continue to decrease. At this time, even if the actual liquid storage volume is greater than the theoretical liquid storage volume, it is still necessary to replenish the refrigerant in the liquid storage device to reduce the situation where the actual liquid storage volume in the liquid storage device is less than the theoretical liquid storage volume due to the gas replenishment solenoid valve replenishing gas to the compressor.

[0089] Taking a scenario where the theoretical refrigerant storage capacity is greater than the actual storage capacity as an example, if the first target opening degree is greater than or equal to the preset opening degree, and the difference in storage capacity is greater than or equal to the preset difference in storage capacity, it indicates that the gas supply solenoid valve provides a larger amount of gas to the compressor, and a larger amount of refrigerant needs to be added to the storage device. Conversely, if the first target opening degree is greater than or equal to the preset opening degree, and the difference in storage capacity is greater than or equal to the preset difference in storage capacity, it indicates that the gas supply solenoid valve provides a larger amount of gas to the compressor, and a smaller amount of refrigerant needs to be added to the storage device. In this case, the first opening degree is made greater than the second opening degree to improve the refrigerant replenishment efficiency when a larger amount of refrigerant needs to be added.

[0090] If the first target opening degree is less than the preset opening degree, and the difference in liquid storage volume is greater than or equal to the preset difference in liquid storage volume, it indicates that the amount of gas supplied to the compressor by the gas supply solenoid valve is small, and the amount of refrigerant to be added to the liquid storage device is large. At this time, the amount of refrigerant flowing out of the liquid storage device is small, and the third opening degree can be reduced accordingly, making the third opening degree smaller than the first opening degree.

[0091] If the first target opening degree is less than the preset opening degree, and the difference in liquid storage volume is less than the preset difference in liquid storage volume, it indicates that the amount of gas supplied to the compressor by the gas supply solenoid valve is small, and the amount of refrigerant to be added to the liquid storage device is also small. At this time, the amount of refrigerant flowing out of the liquid storage device is small, so the fourth opening degree can be reduced accordingly, making the fourth opening degree smaller than the third opening degree, and the fourth opening degree can also be smaller than the second opening degree.

[0092] Furthermore, when the theoretical storage volume is greater than or equal to the actual storage volume, the preset storage volume difference is negatively correlated with the first target opening degree.

[0093] When the theoretical storage volume is less than the actual storage volume, the preset storage volume difference is positively correlated with the first target opening degree.

[0094] When the theoretical refrigerant storage capacity is greater than or equal to the actual refrigerant storage capacity, i.e., when the refrigerant storage device needs to be replenished, the preset refrigerant storage capacity difference is negatively correlated with the first target opening degree. In other words, the larger the first target opening degree, the smaller the preset refrigerant storage capacity difference. Thus, when the gas supply solenoid valve supplies more gas to the compressor, the preset refrigerant storage capacity difference decreases, increasing the likelihood that the controller will determine that a larger amount of refrigerant needs to be added to the storage device. This increases the likelihood that the second target opening degree will be the first or third opening degree, thereby increasing the opening degree of the refrigerant supply solenoid valve and improving the refrigerant replenishment speed of the refrigerant regulating device. Conversely, when the first target opening degree is smaller, the preset refrigerant storage capacity difference increases. Thus, when the gas supply solenoid valve supplies less gas to the compressor, the preset refrigerant storage capacity difference increases, increasing the likelihood that the controller will determine that a smaller amount of refrigerant needs to be added to the storage device. This increases the likelihood that the second target opening degree will be the second or fourth opening degree, ensuring that the storage device's needs are met even when the second target opening degree is smaller.

[0095] Optionally, the second target opening can be calculated as follows:

[0096] S2 = k1*ΔD + k2*S1.

[0097] Wherein, S2 is the second target opening degree, k1 is the first adjustment coefficient, ΔD is the difference in liquid storage volume, k2 is the second adjustment coefficient, and S1 is the first target opening degree.

[0098] In this embodiment, part of the refrigerant entering the refrigerant regulating branch through the liquid receiver solenoid valve is stored in the storage device, while the other part flows to the compressor through the gas replenishment solenoid valve to replenish the compressor. Therefore, the second target opening degree of the liquid receiver solenoid valve is determined by the difference between the theoretical liquid storage amount and the actual liquid storage amount and the first target opening degree of the gas replenishment solenoid valve.

[0099] Optionally, k2 is related to the inner diameters of the liquid-receiving solenoid valve and the gas-replenishing solenoid valve. Because the inner diameters of the liquid-receiving solenoid valve and the gas-replenishing solenoid valve are different, their flow rates may differ even when their opening degrees are the same. When the inner diameter of the liquid-receiving solenoid valve is larger than that of the gas-replenishing solenoid valve, k2 is less than 1. When the inner diameter of the liquid-receiving solenoid valve is larger than that of the gas-replenishing solenoid valve, k2 is greater than 1. Further, k2 is the ratio of the inner diameter of the gas-replenishing solenoid valve to the inner diameter of the liquid-receiving solenoid valve.

[0100] S036, the controller controls the gas replenishment solenoid valve to operate at the first target opening degree, and controls the liquid storage solenoid valve to operate at the second target opening degree.

[0101] Combination Figure 6As shown, this disclosure provides a control device for a heat exchange system, including a processor 100 and a memory 101. Optionally, the device may further include a communication interface 102 and a bus 103. The processor 100, communication interface 102, and memory 101 can communicate with each other via the bus 103. The communication interface 102 can be used for information transmission. The processor 100 can call logical instructions in the memory 101 to execute the control method for the heat exchange system described in the above embodiment.

[0102] Furthermore, the logic instructions in the aforementioned memory 101 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium.

[0103] The memory 101, 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 100 executes functional applications and data processing by running the program instructions / modules stored in the memory 101, thereby implementing the control method for the heat exchange system in the above embodiments.

[0104] The memory 101 may include a program storage area and a data storage area. The program storage area may store the operating system and applications 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 101 may include high-speed random access memory and may also include non-volatile memory.

[0105] This disclosure provides a heat exchange system, which further includes the aforementioned control device for the heat exchange system. The control device is installed in the heat exchange loop or the refrigerant regulation loop. The installation relationship described herein is not limited to placement within 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 for the heat exchange system can be adapted to feasible product bodies to achieve other feasible embodiments.

[0106] 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.

[0107] The aforementioned computer-readable storage medium may be a transient computer-readable storage medium or a non-transitory computer-readable storage medium.

[0108] 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.

[0109] 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.

[0110] 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.

[0111] 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.

[0112] 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 a heat exchange loop and a refrigerant regulation branch. The heat exchange loop includes a compressor, an outdoor heat exchanger, a throttle valve, and an indoor heat exchanger connected in sequence. The liquid receiver end of the refrigerant regulation branch is connected to the heat exchange loop located between the throttle valve and the indoor heat exchanger. The gas supply end of the refrigerant regulation branch is connected to the compressor's return port. The refrigerant regulation branch includes a liquid receiver solenoid valve, a liquid receiver device, and a gas supply solenoid valve connected in sequence. The liquid receiver solenoid valve is located at the liquid receiver end of the refrigerant regulation branch and is connected to the liquid receiver port of the liquid receiver device. The gas supply solenoid valve is located at the gas supply end of the refrigerant regulation branch and is connected to the gas supply port of the liquid receiver device. The control method includes: Obtain compressor operating parameters; Adjust the refrigerant storage in the refrigerant regulating branch according to the compressor operating parameters; The compressor's operating parameters include its operating frequency and discharge pressure. Based on these parameters, the refrigerant reserve in the refrigerant regulating branch is adjusted, including: Determine the first target opening degree of the gas replenishment solenoid valve based on the compressor's discharge pressure; Determine the theoretical liquid storage capacity of the liquid storage device corresponding to the operating frequency of the compressor; Obtain the actual liquid volume stored in the liquid storage device; Based on the first target opening degree, the second target opening degree of the liquid storage solenoid valve is determined according to the difference between the theoretical liquid storage capacity and the actual liquid storage capacity. Control the gas replenishment solenoid valve to operate at the first target opening degree, and control the liquid storage solenoid valve to operate at the second target opening degree.

2. The control method according to claim 1, characterized in that, The compressor's operating parameters include the compressor's operating load; adjusting the refrigerant reserve in the refrigerant regulating branch according to the compressor's operating parameters also includes: When the compressor is operating at a high load, reduce the refrigerant storage in the refrigerant regulating branch; When the compressor is operating at a low load, increase the refrigerant storage in the refrigerant regulating branch.

3. The control method according to claim 2, characterized in that, Increasing the refrigerant storage in the refrigerant regulating branch includes: controlling both the liquid receiver solenoid valve and the gas injection solenoid valve to be open, with the opening degree of the liquid receiver solenoid valve being greater than that of the gas injection solenoid valve; and / or, Reduce the refrigerant storage in the refrigerant regulation branch by controlling both the liquid receiver solenoid valve and the gas injection solenoid valve to be open, with the opening degree of the liquid receiver solenoid valve being less than that of the gas injection solenoid valve.

4. The control method according to claim 1, characterized in that, Based on the first target opening degree, the second target opening degree of the liquid storage solenoid valve is determined according to the difference between the theoretical liquid storage volume and the actual liquid storage volume, including: If the first target opening degree is greater than or equal to the preset opening degree, and the difference in liquid storage volume is greater than or equal to the preset difference in liquid storage volume, the second target opening degree is determined as the first opening degree. If the first target opening is greater than or equal to the preset opening and the difference in liquid volume is less than the preset difference in liquid volume, the second target opening is determined as the second opening. If the first target opening degree is less than the preset opening degree and the difference in liquid storage volume is greater than or equal to the preset difference in liquid storage volume, the second target opening degree is determined as the third opening degree. If the first target opening degree is less than the preset opening degree and the difference in liquid storage volume is less than the preset difference in liquid storage volume, the second target opening degree is determined to be the fourth opening degree. Among them, the first opening is greater than the second opening, the first opening is greater than the third opening, the third opening is greater than the fourth opening, and the second opening is greater than the fourth opening.

5. The control method according to claim 1, characterized in that, Based on the first target opening degree, the second target opening degree of the inlet solenoid valve is determined according to the difference between the theoretical and actual liquid storage volume, including calculating the second target opening degree as follows: in, For the second target opening, The first adjustment coefficient, This is the difference in liquid storage volume. This is the second adjustment coefficient. The first target opening degree.

6. 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 5.

7. 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 regulation branch includes a liquid receiver and a gas supply branch. The liquid receiver is connected to the heat exchange circuit located between the outdoor heat exchanger and the expansion valve, and the gas supply branch is connected to the compressor's return port; and, The control device for a heat exchange system as described in claim 6.

8. The heat exchange system according to claim 7, characterized in that, The refrigerant regulation branch includes: liquid storage device; The liquid storage solenoid 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 gas replenishment solenoid valve is located at the gas replenishment end of the refrigerant regulation branch and is connected to the gas replenishment port of the liquid storage device.

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