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

Abstract

The invention 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 loop and a refrigerant adjusting branch, the heat exchange loop comprises a compressor, a condenser, a throttling device and an evaporator which are connected in sequence, and the refrigerant adjusting branch is connected to the heat exchange loop between the condenser and the throttling device in series; the control method comprises the steps that the actual refrigerant pressure of a refrigerant flowing through the condenser is obtained; and the refrigerant storage amount of the refrigerant adjusting branch is adjusted according to the actual refrigerant pressure. According to the embodiment of the invention, the actual refrigerant pressure of the refrigerant flowing out of the condenser can be obtained, and the refrigerant storage amount of the refrigerant adjusting branch is adjusted according to the actual refrigerant pressure, so that the refrigerant filling reasonability 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] The present application relates to the technical field of heat exchange systems, for example, to a control method and device for a heat exchange system, and a heat exchange system. Background Art

[0002] The refrigerant in the air conditioning system circulates in the system to achieve cooling or heating operation mode. When the air conditioner is running in cooling mode with different loads or heating mode with different loads, the optimal refrigerant circulation volume required by the heat exchange system is different, but for the heat exchange system, the refrigerant filling volume is fixed. When the outside temperature of the cooling system is high or the outside temperature of the heating system is low, the rated refrigerant volume may cause the air conditioning system to overload, resulting in poor cooling or heating effects; and when the outside temperature of the cooling system is low or the outside temperature of the heating system is high, the air conditioning system is running at low load, and the amount of refrigerant may be in a surplus situation. This part of the refrigerant does not play a role in heat exchange during system operation, resulting in low energy efficiency of the temperature control equipment unit and failure to bring into play the optimal performance of the heat exchange system.

[0003] In the related art, the refrigerant in the heat exchange system is generally regulated by adjusting the opening of the throttle to reduce the pressure, cool down or increase the pressure and heat the refrigerant, so that the refrigerant state meets the needs of the indoor heat exchanger and puts the heat exchange system in a relatively good state.

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

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

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

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

[0008] The embodiments of the present disclosure provide a control method and device for a heat exchange system, and a heat exchange system, so as 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 the present application, a control method for a heat exchange system is provided, wherein the heat exchange system includes a heat exchange circuit and a refrigerant regulating branch, the heat exchange circuit includes a compressor, a condenser, a throttling device and an evaporator connected in sequence, and the refrigerant regulating branch is connected in series to the heat exchange circuit between the condenser and the throttling device; the control method includes: obtaining the actual refrigerant pressure of the refrigerant flowing through the condenser; and adjusting the refrigerant reserve of the refrigerant regulating branch according to the actual refrigerant pressure.

[0010] In some optional embodiments, the refrigerant reserve of the refrigerant regulating branch is adjusted according to the operating parameters of the heat exchange system, including: when the actual refrigerant pressure is greater than or equal to the preset refrigerant pressure, reducing the refrigerant reserve of the refrigerant regulating branch; when the actual refrigerant pressure is less than the preset refrigerant pressure, increasing the refrigerant reserve of the refrigerant regulating branch.

[0011] In some optional embodiments, the refrigerant regulating branch includes a first branch, a second branch, a bypass branch and a liquid storage device, wherein two ends of the first branch are respectively connected to the condenser and the liquid storage device, two ends of the second branch are respectively connected to the liquid storage device and the throttling device, two ends of the bypass branch are respectively connected to the liquid storage device and the throttling device, the bypass branch is connected to the lower end of the liquid storage device, and the second branch is connected to the upper end of the liquid storage device;

[0012] Reducing the refrigerant storage of the refrigerant regulating branch includes: controlling the conduction of the bypass branch; and / or,

[0013] Increase the refrigerant reserve of the refrigerant regulating branch, including: controlling the bypass branch to disconnect.

[0014] In some optional embodiments, the refrigerant regulating branch includes a first branch, a second branch, a bypass branch and a liquid storage device, wherein two ends of the first branch are respectively connected to the condenser and the liquid storage device, two ends of the second branch are respectively connected to the liquid storage device and the throttling device, two ends of the bypass branch are respectively connected to the liquid storage device and the throttling device, the bypass branch is connected to the lower end of the liquid storage device, and the second branch is connected to the upper end of the liquid storage device; adjusting the refrigerant storage of the refrigerant regulating branch according to the actual refrigerant pressure includes:

[0015] Determine a first change frequency of the actual refrigerant pressure in a first preset time period; and control the flow of the bypass branch according to the first change frequency.

[0016] In some optional embodiments, the first preset duration is determined according to the following method:

[0017] Determine the temperature difference between the indoor temperature and the preset temperature;

[0018] When the temperature difference is greater than or equal to the preset difference, determining the first preset time length as the first time length;

[0019] When the temperature difference is less than the preset difference, determining the first preset time length as the second time length;

[0020] Among them, the first duration is shorter than the second duration.

[0021] In some optional embodiments, the refrigerant regulating branch also includes a bypass solenoid valve, which is arranged in the bypass branch; according to the first change frequency, the flow of the bypass branch is controlled, including: when the first change frequency is greater than or equal to the first preset frequency, the bypass solenoid valve is controlled to open to a first opening degree.

[0022] In some optional embodiments, controlling the flow of the bypass branch according to the first change frequency further includes:

[0023] When the first change frequency is less than the first preset frequency, obtaining a second change frequency of the actual refrigerant pressure in a second preset time period;

[0024] When the second changing frequency is greater than the second preset frequency, the bypass solenoid valve is controlled to open to a second opening degree;

[0025] When the second changing frequency is less than the second preset frequency, the bypass solenoid valve is controlled to open to a third opening degree;

[0026] The first opening is greater than or equal to the second opening, the second opening is greater than the third opening, and the second preset time length is less than the first preset time length.

[0027] According to an embodiment of the second aspect of the present application, a control device for a heat exchange system is provided, comprising a processor and a memory storing program instructions, wherein the processor is configured to execute the control method for a heat exchange system as described above when running the program instructions. .

[0028] According to an embodiment of the third aspect of the present application, a heat exchange system is provided, comprising: a heat exchange circuit, comprising a compressor, a condenser, a throttling device and an evaporator connected in sequence; a refrigerant regulating branch, connected in series to the heat exchange circuit between the condenser and the throttling device; and a control device for the heat exchange system as described above.

[0029] In some optional embodiments, the refrigerant regulating branch includes: a liquid storage device; a first branch, whose two ends are respectively connected to the condenser and the liquid storage device; a second branch, whose two ends are respectively connected to the liquid storage device and the throttling device, and connected to the upper end of the liquid storage device; a bypass branch, whose two ends are respectively connected to the liquid storage device and the throttling device, and connected to the lower end of the liquid storage device.

[0030] The control method and device for a heat exchange system and the heat exchange system provided in the embodiments of the present disclosure can achieve the following technical effects:

[0031] The heat exchange system includes a heat exchange circuit and a refrigerant regulating branch, and the refrigerant regulating branch is connected in series between the condenser and the throttling device. In this way, the refrigerant in the heat exchange system can enter the refrigerant regulating branch when performing a heat exchange cycle in the heat exchange circuit, and part of the refrigerant can be stored in the refrigerant regulating branch, thereby reducing the amount of refrigerant participating in the heat exchange cycle. Alternatively, the refrigerant stored in the refrigerant regulating branch can be discharged from the refrigerant regulating branch and flow into the heat exchange system to increase the amount of refrigerant participating in the heat exchange cycle. The disclosed embodiment can obtain the actual refrigerant pressure of the refrigerant flowing out of the condenser, and adjust the refrigerant storage capacity of the refrigerant regulating branch according to the actual refrigerant pressure, so as to improve the rationality of refrigerant charging of the heat exchange system under different working conditions and improve the performance of the heat exchange system.

[0032] The above general description and the following description are exemplary and explanatory only and are not intended to limit the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] One or more embodiments are exemplarily described by corresponding drawings, which do not limit the embodiments. Elements with the same reference numerals in the drawings are shown as similar elements, and the drawings do not constitute a scale limitation, and wherein:

[0034] Figure 1 is a flow chart of a control method for a heat exchange system provided by an embodiment of the present disclosure;

[0035] Figure 2 is a flow chart of another control method for a heat exchange system provided by an embodiment of the present disclosure;

[0036] Figure 3 is a flow chart of another control method for a heat exchange system provided by an embodiment of the present disclosure;

[0037] Figure 4 is a flow chart of another control method for a heat exchange system provided by an embodiment of the present disclosure;

[0038] Figure 5 is a structural schematic diagram of a heat exchange system provided by an embodiment of the present disclosure;

[0039] Figure 6 is a schematic structural diagram of a control device for a heat exchange system provided by an embodiment of the present disclosure;

[0040] Figure 7 is a simulation schematic diagram of a refrigerant regulating branch when the bypass branch is turned on provided by an embodiment of the present disclosure;

[0041] Figure 8 It is a simulation schematic diagram of the refrigerant regulating branch when the bypass branch is disconnected provided in an embodiment of the present disclosure.

[0042] Reference numerals:

[0043] 100. Processor; 101. Memory; 102. Communication interface; 103. Bus; 200. Compressor; 300. Condenser; 400. Throttling device; 500. Evaporator; 600. Refrigerant regulating branch; 610. First branch; 620. Second branch; 630. Bypass branch; 640. Bypass solenoid valve; 650. Liquid storage device. DETAILED DESCRIPTION

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

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

[0046] In the embodiments of the present disclosure, the terms "upper", "lower", "inside", "middle", "outside", "front", "back" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. These terms are mainly intended to better describe the embodiments of the present disclosure and their embodiments, and are not intended to limit the indicated devices, elements or components to have a specific direction, or to be constructed and operated in a specific direction. Moreover, in addition to being used to indicate directions or positional relationships, some of the above terms may also be used to indicate other meanings. For example, the term "upper" may also be used to indicate a certain dependency or connection relationship in certain circumstances. For those of ordinary skill in the art, the specific meanings of these terms in the embodiments of the present disclosure can be understood according to specific circumstances.

[0047] In addition, the terms "disposed", "connected", and "fixed" should be understood in a broad sense. For example, "connected" 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, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present disclosure can be understood according to specific circumstances.

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

[0049] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present disclosure may be combined with each other.

[0050] The present disclosure provides a heat exchange system, such as Figure 5 As shown, the heat exchange system includes a heat exchange circuit and a refrigerant regulating branch 600. The heat exchange circuit includes a compressor 200, a condenser 300, a throttling device 400 and an evaporator 500 connected in sequence. The refrigerant regulating branch 600 is connected in series to the heat exchange circuit between the condenser 300 and the throttling device 400.

[0051] In this embodiment, the heat exchange system includes a heat exchange circuit and a refrigerant regulating branch 600, and the refrigerant regulating branch 600 is connected in series between the refrigerant device and the throttling device 400. The refrigerant flowing out of the condenser 300 flows to the throttling device 400 after passing through the refrigerant regulating branch 600. In this way, part of the refrigerant flowing out of the condenser 300 can be stored in the refrigerant regulating branch 600 to reduce the amount of refrigerant participating in the heat exchange cycle in the heat exchange circuit. In addition, the refrigerant stored in the refrigerant regulating branch 600 can also flow out of the refrigerant regulating branch 600 and flow into the throttling device 400 to participate in the heat exchange cycle, thereby increasing the amount of refrigerant participating in the heat exchange cycle in the heat exchange circuit. The disclosed embodiment can adjust the refrigerant storage of the refrigerant regulating branch 600, thereby adjusting the amount of refrigerant participating in the heat exchange cycle, so as to improve the rationality of the amount of refrigerant participating in the heat exchange cycle of the heat exchange system under different working conditions, and improve the performance of the heat exchange system.

[0052] Optionally, when the operation mode of the heat exchange system is a refrigeration operation mode, the refrigerant flows out of the compressor 200, flows through the condenser 300, the refrigerant regulating branch 600, the throttling device 400 and the evaporator 500 in sequence, and then flows back into the compressor 200 to complete a refrigeration cycle. At this time, the refrigerant condenses and releases heat in the condenser 300. The refrigerant evaporates and absorbs heat in the evaporator 500 to absorb the heat of the environment emitted by the evaporator 500, provide cooling to the environment, and reduce the temperature of the environment. In this way, the refrigerant storage capacity of the refrigerant regulating branch 600 can be adjusted by adjusting the difference between the refrigerant flowing into and out of the refrigerant regulating branch 600.

[0053] In some optional embodiments, such as Figure 5As shown, the refrigerant regulating branch 600 includes a first branch 610, a second branch 620, a bypass branch 630 and a liquid storage device 650. The two ends of the first branch 610 are respectively connected to the condenser 300 and the liquid storage device 650, the two ends of the second branch 620 are respectively connected to the liquid storage device 650 and the throttling device 400, and the two ends of the bypass branch 630 are respectively connected to the liquid storage device 650 and the throttling device 400. The bypass branch 630 is connected to the lower end of the liquid storage device 650, and the second branch 620 is connected to the upper end of the liquid storage device 650.

[0054] With this optional embodiment, the two ends of the first branch 610 are connected to the condenser 300 and the liquid storage device 650, respectively, and the refrigerant flowing out of the condenser 300 can flow into the liquid storage device 650 through the first branch 610. The two ends of the second branch 620 are connected to the liquid storage device 650 and the throttling device 400, respectively, and the second branch 620 is connected to the upper end of the liquid storage device 650. In this way, the refrigerant at the upper end of the liquid storage device 650 can flow out of the liquid storage device 650 through the second branch 620 to flow into the throttling device 400. The two ends of the bypass branch 630 are connected to the liquid storage device 650 and the throttling device 400, respectively, and the bypass branch 630 is connected to the lower end of the liquid storage device 650. In this way, the refrigerant at the upper end and the lower end of the liquid storage device 650 can flow out of the liquid storage device 650 through the bypass branch 630 to flow into the throttling device 400.

[0055] For example, when the storage volume of the refrigerant regulating branch 600 is increased, the second branch 620 can be opened and the bypass branch 630 can be disconnected. The lower end of the liquid storage device 650 can store refrigerant to increase the refrigerant storage volume of the liquid storage device 650. After the refrigerant volume of the liquid storage device 650 is increased, the refrigerant flowing into the liquid storage device 650 from the first branch 610 can flow out directly through the second branch 620, so that the refrigerant can circulate in the heat exchange circuit and the refrigerant regulating branch 600.

[0056] In the case of reducing the storage amount of the refrigerant regulating branch 600, the second branch 620 and the bypass branch 630 can be opened. The upper end of the liquid storage device 650 can flow out of the liquid storage device 650 through the second branch 620 and the bypass branch 630, and the refrigerant at the lower end of the liquid storage device 650 can flow out of the liquid storage device 650 through the bypass branch 630, increasing the outflow of the refrigerant to reduce the refrigerant storage amount of the liquid storage device 650.

[0057] For example, Figure 7 As shown, when the bypass branch 630 is turned on, the refrigerant flowing into the liquid storage device 650 from the first branch 610 can flow out through the bypass branch 630 to reduce the refrigerant storage capacity of the liquid storage device 650, so that the liquid storage device 650 stores a small amount of refrigerant. Figure 8As shown, when the bypass branch 630 is disconnected, the gas refrigerant in the liquid storage device 650 is first discharged through the second branch 620, and the refrigerant flowing into the liquid storage device 650 from the first branch 610 is then discharged through the second branch 620, so as to increase the refrigerant storage capacity of the liquid storage device 650, so that the liquid storage device 650 can store a large amount of refrigerant. For example, when the bypass branch 630 is connected, the liquid storage device 650 can store 7.2 grams of refrigerant, and when the bypass branch 630 is disconnected, the liquid storage device 650 can store 38 grams of refrigerant. The refrigerant storage capacity of the liquid storage device 650 when the bypass branch 630 is disconnected can be increased by 528% compared with the refrigerant storage capacity of the liquid storage device 650 when the bypass branch 630 is connected.

[0058] Optionally, when the operation mode of the heat exchange system is the heating operation mode, the refrigerant flows out of the compressor 200, passes through the evaporator 500, the throttling device 400, the refrigerant regulating branch 600 and the condenser 300 in sequence, and then flows back into the compressor 200 to complete a heating cycle. At this time, the refrigerant condenses and releases heat in the evaporator 500 to increase the heat to the environment where the evaporator 500 is located, thereby increasing the temperature of the environment. The refrigerant evaporates and absorbs heat in the condenser 300, and becomes a gaseous refrigerant to be supplied to the compressor 200. Moreover, under normal circumstances, the operation load of the heat exchange system in the heating operation mode is greater than the operation load of the heat exchange system in the cooling operation mode.

[0059] In some optional embodiments, the refrigerant regulating branch 600 further includes a bypass solenoid valve 640 , and the bypass solenoid valve 640 is disposed on the bypass branch 630 .

[0060] In this embodiment, the bypass branch 630 is provided with a bypass electromagnetic valve 640, and the on-off of the bypass branch 630 can be controlled by opening and closing the bypass electromagnetic valve 640. In addition, the flow of the bypass branch 630 can also be adjusted by adjusting the opening size of the bypass electromagnetic valve 640.

[0061] Optionally, the second branch 620 is always in a conducting state. In this way, the refrigerant flowing into the liquid storage device 650 can flow out through the second branch 620, so that the refrigerant can flow through the refrigerant regulating branch 600, thereby improving the stability and reliability of the refrigerant in the heat exchange cycle.

[0062] Furthermore, one end of the first branch 610 is communicated with the condenser 300 , and the other end of the first branch 610 is communicated with the lower end of the liquid storage device 650 .

[0063] In this embodiment, the refrigerant flowing out of the throttling device 400 can flow into the liquid storage device 650 through the second branch 620 and / or the bypass branch 630, and the refrigerant at the upper end and the lower end of the liquid storage device 650 can flow out of the liquid storage device 650 through the first branch 610 to flow out of the condenser 300. In this way, the amount of refrigerant participating in the heat exchange cycle of the heat exchange system in the heating operation mode can be increased, thereby improving the energy efficiency of the heat exchange system.

[0064] Figure 1 1 is a flow chart of a control method for a heat exchange system provided by an embodiment of the present disclosure. The control method for a heat exchange system can be executed in a controller of the heat exchange system.

[0065] S011, the controller obtains the actual refrigerant pressure of the refrigerant flowing through the condenser.

[0066] S012, the controller adjusts the refrigerant storage capacity of the refrigerant regulating branch according to the actual refrigerant pressure.

[0067] In the disclosed embodiment, the controller can obtain the actual refrigerant pressure of the refrigerant flowing out of the condenser, and adjust the refrigerant reserve of the refrigerant regulating branch according to the actual refrigerant pressure, so as to adjust the amount of refrigerant participating in the heat exchange cycle in the heat exchange circuit, so that the amount of refrigerant participating in the heat exchange cycle is different under different operating parameters of the heat exchange system, so as to improve the rationality of the amount of refrigerant participating in the heat exchange cycle of the heat exchange system under different working conditions and improve the performance of the heat exchange system.

[0068] Figure 2 1 is a flow chart of another control method for a heat exchange system provided by an embodiment of the present disclosure. The control method for a heat exchange system can be executed in a controller of the heat exchange system.

[0069] S021, the controller obtains the actual refrigerant pressure of the refrigerant flowing through the condenser.

[0070] S022: When the actual refrigerant pressure is greater than or equal to the preset refrigerant pressure, the controller reduces the refrigerant storage capacity of the refrigerant regulating branch.

[0071] In this embodiment, when the actual refrigerant pressure is greater than or equal to the preset refrigerant pressure, it means that the refrigerant pressure discharged by the compressor increases, and the heat exchange capacity of the heat exchange system increases. At this time, the operating load of the heat exchange system is high load. The controller controls to reduce the refrigerant storage of the refrigerant regulating branch, so that the refrigerant in the refrigerant regulating branch flows into the heat exchange circuit, participates in the heat exchange cycle, and increases the heat exchange capacity of the heat exchange system.

[0072] Exemplarily, the controller reduces the refrigerant storage capacity of the refrigerant regulating branch, including the controller controlling the bypass branch to be turned on.

[0073] In this embodiment, the refrigerant regulating branch includes a bypass branch connected between the lower end of the liquid storage device and the throttling device. When reducing the refrigerant storage capacity of the refrigerant regulating branch, the controller can control the bypass branch to be turned on. So that the refrigerant at the upper end and the lower end of the liquid storage device can flow into the heat exchange circuit to increase the amount of refrigerant participating in the heat exchange cycle. In addition, the bypass branch is connected to the lower end of the liquid storage device, and the refrigerant at the upper end and the lower end of the liquid storage device can flow out through the bypass branch. The upper end and the lower end of the liquid storage device cannot store refrigerant, so as to reduce the amount of refrigerant stored in the liquid storage device during the flow of the refrigerant and increase the amount of refrigerant participating in the heat exchange cycle.

[0074] S023, when the actual refrigerant pressure is less than the preset refrigerant pressure, the controller increases the refrigerant storage capacity of the refrigerant regulating branch.

[0075] In this embodiment, when the actual refrigerant pressure is less than the preset refrigerant pressure, it means that the refrigerant pressure discharged by the compressor is reduced, and the heat exchange amount of the heat exchange system is reduced. At this time, the operating load of the heat exchange system is low load. The controller controls to increase the refrigerant storage capacity of the refrigerant regulating branch so that part of the refrigerant in the heat exchange circuit is stored in the refrigerant regulating branch, reducing the amount of refrigerant participating in the heat exchange cycle. Reduce the occurrence of increased energy consumption when more refrigerant participates in the heat exchange cycle, so as to improve the heat exchange performance of the heat exchange system.

[0076] Exemplarily, the controller increases the refrigerant reserve of the refrigerant regulating branch, including the controller controlling the bypass branch to be disconnected.

[0077] In this embodiment, the refrigerant regulating branch includes a bypass branch connected between the lower end of the liquid storage device and the throttling device. When the refrigerant storage capacity of the refrigerant regulating branch is increased, the controller controls the bypass branch to be disconnected. In this way, the lower end of the liquid storage device can be used to store refrigerant, thereby increasing the refrigerant storage capacity of the refrigerant regulating branch.

[0078] Figure 3 1 is a flow chart of another control method for a heat exchange system provided by an embodiment of the present disclosure. The control method for a heat exchange system can be executed in a controller of the heat exchange system.

[0079] S031, the controller obtains the actual refrigerant pressure of the refrigerant flowing through the condenser.

[0080] S032, the controller determines a first changing frequency of the actual refrigerant pressure in a first preset time period.

[0081] In some optional embodiments, the first preset duration is determined according to the following method:

[0082] S0321, the controller determines the temperature difference between the indoor temperature and the preset temperature.

[0083] S0322: When the temperature difference is greater than or equal to the preset difference, determine the first preset time length as the first time length.

[0084] S0323: When the temperature difference is less than the preset difference, determine the first preset time length as the second time length.

[0085] Among them, the first duration is shorter than the second duration.

[0086] In this embodiment, the controller determines the temperature difference between the indoor temperature and the preset temperature. When the temperature difference is greater than or equal to the preset difference, it means that the indoor temperature is significantly different from the preset temperature, and it is necessary to increase the operating load of the heat exchange system, or put the heat exchange system in a high-load operating state to increase the heat exchange of the heat exchange system. At this time, the rate of change of the indoor temperature is relatively large. When the temperature difference is less than the preset difference, it means that the difference between the indoor temperature and the preset temperature is relatively small. In this way, the operating load of the heat exchange system can be reduced, or the heat exchange system can be put in a low-load operating state. At this time, the rate of change of the indoor temperature is relatively small.

[0087] The first time length when the temperature difference is less than or equal to the preset difference is less than the second time length when the temperature difference is less than the preset difference. That is, when the heat exchange system is running at a high load or the operating load of the heat exchange system is increased, the first time length is less than the second time length, which can increase the sensitivity of obtaining the first change frequency. When the heat exchange system is running at a low load or the operating load of the heat exchange system is reduced, the load change of the heat exchange system is small, and the second time length is greater than the second time length, so as to improve the accuracy of obtaining the first change frequency.

[0088] S033, according to the first change frequency, the controller controls the flow of the bypass branch.

[0089] In this embodiment, the first change frequency is the change frequency of the actual refrigerant pressure within the first preset time, and the controller controls the flow of the bypass branch according to the first change frequency. That is, the controller can control the flow of the bypass branch according to the change frequency of the operating load of the heat exchange system, so as to timely adjust the refrigerant storage in the liquid storage device.

[0090] When the bypass branch is open, it is necessary to reduce the refrigerant storage capacity of the refrigerant regulating branch. Therefore, in the control method of the embodiment of the present disclosure, the actual refrigerant pressure is greater than or equal to the preset refrigerant pressure.

[0091] Figure 4 1 is a flow chart of another control method for a heat exchange system provided by an embodiment of the present disclosure. The control method for a heat exchange system can be executed in a controller of the heat exchange system.

[0092] S041, the controller obtains the actual refrigerant pressure of the refrigerant flowing through the condenser.

[0093] S042, the controller determines a first change frequency of the actual refrigerant pressure in a first preset time period;

[0094] S043, when the first change frequency is greater than or equal to the first preset frequency, the controller controls the bypass solenoid valve to open to a first opening degree.

[0095] Using this optional embodiment, when the first change frequency is greater than or equal to the first preset frequency, the controller controls the bypass solenoid valve to open to a first opening, and the bypass branch is connected, so that the refrigerant in the liquid storage device flows out through the bypass branch and flows into the heat exchange circuit, thereby increasing the amount of refrigerant participating in the heat exchange cycle.

[0096] S044, when the first change frequency is less than the first preset frequency, the controller obtains a second change frequency of the actual refrigerant pressure in a second preset time length, wherein the second preset time length is less than the first preset time length.

[0097] S045, when the second change frequency is greater than the second preset frequency, the controller controls the bypass solenoid valve to open to a second opening degree.

[0098] S046: When the second changing frequency is less than the second preset frequency, the controller controls the bypass solenoid valve to open to a third opening degree.

[0099] The first opening is greater than or equal to the second opening, and the second opening is greater than the third opening.

[0100] Furthermore, the first preset frequency is greater than or equal to 0. The first change frequency is the difference between the actual refrigerant pressure at the end of the first preset time and the actual refrigerant pressure at the beginning of the first preset time divided by the first preset time.

[0101] When the first preset frequency is equal to 0, and the first change frequency is greater than or equal to the first preset frequency, that is, the first change frequency is greater than or equal to 0, it can be judged that the actual refrigerant pressure is in an increasing state within the first preset time, and the operating load of the heat exchange system is also in an increasing state. The controller controls the bypass solenoid valve to open to the first opening, so that the refrigerant regulating branch can add refrigerant to the heat exchange circuit and increase the amount of refrigerant participating in the heat exchange cycle.

[0102] When the first change frequency is less than the first preset frequency, that is, the first change frequency is less than 0. In this way, it can be determined that the actual refrigerant pressure is in a decreasing state within the preset time length, and the operating load of the heat exchange system is also in a decreasing state. However, the operating load of the heat exchange system fluctuates, and the actual refrigerant pressure may first increase and then decrease within the first preset time length, or may first decrease and then increase. In this embodiment, when the first change frequency is less than the first preset frequency, the second change frequency of the actual refrigerant pressure in the second preset time length can be obtained, and the second preset time length is less than the first preset time length. In this way, this embodiment can obtain the actual refrigerant change frequency in a shorter time to reduce the occurrence of low detection accuracy when the actual refrigerant fluctuates.

[0103] When the second change frequency is greater than the second preset frequency, it means that the actual refrigerant pressure is in an increasing state within the second preset time period. The controller controls the bypass solenoid valve to open to the second opening degree, and the first opening degree is greater than or equal to the second opening degree. In this way, the refrigerant regulating branch can replenish refrigerant to the heat exchange circuit and increase the amount of refrigerant participating in the heat exchange cycle.

[0104] When the second change frequency is less than the second preset frequency, it means that the actual refrigerant pressure is in a decreasing state within the second preset time. The controller controls the bypass valve opening to a third opening. The third opening is less than the second opening. The amount of refrigerant flowing out of the liquid storage device from the bypass branch is reduced, and the lower end of the liquid storage device can also store part of the refrigerant, thereby reducing the speed of the amount of refrigerant added to the heat exchange circuit by the liquid storage device.

[0105] Optionally, within the second preset time period, when the actual refrigerant pressure decreases to a level lower than the preset refrigerant pressure, the third opening degree is 0. In this way, the bypass branch is disconnected and the refrigerant storage capacity of the refrigerant regulating branch is increased.

[0106] When the first preset frequency is greater than 0, and the first change frequency is greater than or equal to the first preset frequency, it means that the actual refrigerant pressure of the refrigerant flowing out of the condenser increases rapidly within the first preset time. At this time, it is necessary to quickly increase the amount of refrigerant participating in the heat exchange cycle to quickly increase the heat exchange capacity of the heat exchange system. Optionally, the first opening is greater than 90% of the maximum opening of the bypass solenoid valve.

[0107] When the first change frequency is less than the first preset frequency, it means that the increase rate of the actual refrigerant pressure within the first preset time is less than the increase rate of the actual refrigerant pressure when the first change frequency is greater than or equal to the first preset frequency, and the operating load of the heat exchange system increases slowly. However, the operating load of the heat exchange system fluctuates, and the actual refrigerant pressure may increase first and then decrease within the first preset time, or may decrease first and then increase. In this embodiment, when the first change frequency is less than the first preset frequency, the second change frequency of the actual refrigerant pressure in the second preset time can be obtained, and the second preset time is less than the first preset time. In this way, this embodiment can obtain the actual refrigerant change frequency in a shorter time to reduce the occurrence of low detection accuracy when the actual refrigerant fluctuates.

[0108] When the second change frequency is greater than the second preset frequency, it means that the actual refrigerant pressure increases faster within the second preset time period. The controller controls the bypass solenoid valve to open to the second opening, and the first opening is greater than or equal to the second opening. In this way, the refrigerant regulating branch can quickly replenish refrigerant to the heat exchange circuit and increase the amount of refrigerant participating in the heat exchange cycle.

[0109] When the second change frequency is less than the second preset frequency, it means that the actual refrigerant pressure increase rate within the second preset time is still less than the actual refrigerant pressure increase rate when the first change frequency is greater than or equal to the first preset frequency, and the actual refrigerant increase rate within the second preset time is slow. The controller controls the bypass valve opening to the third opening. The third opening is less than the second opening. In order to reduce the amount of refrigerant flowing out of the liquid storage device from the bypass branch, the lower end of the liquid storage device can also store part of the refrigerant, reducing the speed of the amount of refrigerant added to the heat exchange circuit by the liquid storage device.

[0110] In some optional embodiments, when the first opening degree is greater than the second opening degree, a rate at which the bypass solenoid valve switches between the first opening degree and the second opening degree is less than a rate at which the bypass solenoid valve switches between the second opening degree and the third opening degree.

[0111] In this embodiment, the first opening and the second opening are both the openings of the bypass solenoid valve when the actual refrigerant pressure increases at a higher rate, and the third opening is the opening of the bypass solenoid valve when the actual refrigerant pressure increases at a lower rate. The rate at which the bypass solenoid valve switches between the second opening and the third opening is greater than the rate at which the bypass solenoid valve switches between the first opening and the second opening, which can increase the sensitivity of the refrigerant regulating branch to replenish refrigerant to the heat exchange circuit when the actual refrigerant pressure changes.

[0112] Combination Figure 6As shown, an embodiment of the present disclosure provides a control device for a heat exchange system, including a processor 100 and a memory 101. Optionally, the control device may also include a communication interface 102 and a bus 103. The processor 100, the communication interface 102, and the memory 101 may communicate with each other through the bus 103. The communication interface 102 may be used for information transmission. The processor 100 may call the logic instructions in the memory 101 to execute the control method for a heat exchange system of the above embodiment.

[0113] In addition, the logic instructions in the memory 101 described above may be implemented in the form of software functional units and when sold or used as independent products, may be stored in a computer-readable storage medium.

[0114] The memory 101 is a computer-readable storage medium that can be used to store software programs and computer executable programs, such as program instructions / modules corresponding to the method in the embodiment of the present disclosure. The processor 100 executes functional applications and data processing by running the program instructions / modules stored in the memory 101, that is, implements the control method for the heat exchange system in the above embodiment.

[0115] The memory 101 may include a program storage area and a data storage area, wherein the program storage area may store an operating system and an application required for at least one function; the data storage area may store data created according to the use of the terminal device, etc. In addition, the memory 101 may include a high-speed random access memory and may also include a non-volatile memory.

[0116] The heat exchange system provided by the embodiment of the present disclosure also includes: a heat exchange system body, and the above-mentioned control device for the heat exchange system. The control device for the heat exchange system is installed in the heat exchange system body. The installation relationship described here is not limited to placement inside the product, but also includes installation connections with other components of the product, including but not limited to physical connections, electrical connections, or signal transmission connections. It can be understood by those skilled in the art that the control device for the heat exchange system can be adapted to the body of a feasible heat exchange system, thereby realizing other feasible embodiments.

[0117] An embodiment of the present disclosure provides a computer-readable storage medium storing computer-executable instructions, wherein the computer-executable instructions are configured to execute the above-mentioned control method for a heat exchange system.

[0118] The computer-readable storage medium mentioned above may be a transient computer-readable storage medium or a non-transitory computer-readable storage medium.

[0119] The technical solution of the embodiment of the present disclosure can be embodied in the form of a software product, which is stored in a storage medium and includes one or more instructions for enabling a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in the embodiment of the present disclosure. The aforementioned storage medium may be a non-transient storage medium, including: a USB flash drive, a mobile hard disk, a read-only memory (ROM, Read-Only Memory), a random access memory (RAM, Random Access Memory), a disk or an optical disk, and other media that can store program codes, or a transient storage medium.

[0120] The above description and the accompanying drawings fully illustrate the embodiments of the present disclosure so that those skilled in the art can practice them. Other embodiments may include structural, logical, electrical, process and other changes. The embodiments represent only possible changes. Unless explicitly required, separate components and functions are optional, and the order of operation may vary. The parts and features of some embodiments may be included in or replace the parts and features of other embodiments. Moreover, the words used in this application are only used to describe the embodiments and are not used to limit the claims. As used in the description of the embodiments and the claims, unless the context clearly indicates, the singular forms of "a", "an" and "the" are intended to include plural forms as well. Similarly, the term "and / or" as used in this application refers to any and all possible combinations of listings containing one or more associated ones. In addition, when used in the present application, the term "comprise" and its variants "comprises" and / or comprising refer to the presence of stated features, wholes, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or groups thereof. In the absence of further restrictions, the elements defined by the sentence "comprising a ..." do not exclude the presence of other identical elements in the process, method or device comprising the elements. In this article, each embodiment may focus on the differences from other embodiments, and the same and similar parts between the various embodiments may refer to each other. For the methods, products, etc. disclosed in the embodiments, if they correspond to the method part disclosed in the embodiments, then the relevant parts can refer to the description of the method part.

[0121] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software may depend on the specific application and design constraints of the technical solution. The technicians may use different methods for each specific application to implement the described functions, but such implementations should not be considered to exceed the scope of the embodiments of the present disclosure. The technicians may clearly understand that, for the convenience and simplicity of description, the specific working processes of the systems, devices and units described above may refer to the corresponding processes in the aforementioned method embodiments, and will not be repeated here.

[0122] In the embodiments disclosed herein, the disclosed methods and products (including but not limited to devices, equipment, etc.) can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units can be only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between each other shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms. The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to implement this embodiment. In addition, each functional unit in the embodiment of the present disclosure may be integrated in a processing unit, or each unit may exist physically alone, or two or more units may be integrated in one unit.

[0123] The flowchart and block diagram in the accompanying drawings show the possible architecture, function and operation of the system, method and computer program product according to the embodiment of the present disclosure. In this regard, each box in the flowchart or block diagram can represent a module, a program segment or a part of the code, and the module, the program segment or a part of the code contains one or more executable instructions for realizing the specified logical function. In some alternative implementations, the functions marked in the box can also occur in a different order from the order marked in the accompanying drawings. For example, two consecutive boxes can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, which can depend on the functions involved. In the description corresponding to the flowchart and the block diagram in the accompanying drawings, the operations or steps corresponding to different boxes can also occur in a different order from the order disclosed in the description, and sometimes there is no specific order between different operations or steps. For example, two consecutive operations or steps can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, which can depend on the functions involved. Each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, may be implemented by a dedicated hardware-based system that performs the specified functions or actions, or may be implemented by a combination of dedicated hardware and computer instructions.

Claims

1. A control method for a heat exchange system, characterized in that: The heat exchange system includes a heat exchange circuit and a refrigerant regulating branch. The heat exchange circuit includes a compressor, a condenser, a throttling device and an evaporator connected in sequence. The refrigerant regulating branch is connected in series to the heat exchange circuit between the condenser and the throttling device. The control method includes: Obtain the actual refrigerant pressure of the refrigerant flowing through the condenser; The refrigerant storage capacity of the refrigerant regulating branch is adjusted according to the actual refrigerant pressure.

2. The control method according to claim 1, characterized in that: According to the operating parameters of the heat exchange system, adjust the refrigerant storage capacity of the refrigerant regulating branch, including: When the actual refrigerant pressure is greater than or equal to the preset refrigerant pressure, the refrigerant storage capacity of the refrigerant regulating branch is reduced; When the actual refrigerant pressure is less than the preset refrigerant pressure, the refrigerant storage capacity of the refrigerant regulating branch is increased.

3. The control method according to claim 2, characterized in that: The refrigerant regulating branch includes a first branch, a second branch, a bypass branch and a liquid storage device, wherein two ends of the first branch are respectively connected to the condenser and the liquid storage device, two ends of the second branch are respectively connected to the liquid storage device and the throttling device, two ends of the bypass branch are respectively connected to the liquid storage device and the throttling device, the bypass branch is connected to the lower end of the liquid storage device, and the second branch is connected to the upper end of the liquid storage device; Reducing the refrigerant storage of the refrigerant regulating branch includes: controlling the conduction of the bypass branch; and / or, Increase the refrigerant reserve of the refrigerant regulating branch, including: controlling the bypass branch to disconnect.

4. The control method according to claim 1, characterized in that: The refrigerant regulating branch includes a first branch, a second branch, a bypass branch and a liquid storage device, wherein two ends of the first branch are respectively connected to the condenser and the liquid storage device, two ends of the second branch are respectively connected to the liquid storage device and the throttling device, two ends of the bypass branch are respectively connected to the liquid storage device and the throttling device, the bypass branch is connected to the lower end of the liquid storage device, and the second branch is connected to the upper end of the liquid storage device; adjusting the refrigerant storage of the refrigerant regulating branch according to the actual refrigerant pressure includes: Determining a first frequency of change of the actual refrigerant pressure for a first preset time period; The flow rate of the bypass branch is controlled according to the first change frequency.

5. The control method according to claim 4, characterized in that: The first preset duration is determined as follows: Determine the temperature difference between the indoor temperature and the preset temperature; When the temperature difference is greater than or equal to the preset difference, determining the first preset time length as the first time length; When the temperature difference is less than the preset difference, determining the first preset time length as the second time length; Among them, the first duration is shorter than the second duration.

6. The control method according to claim 4 or 5, characterized in that: The refrigerant regulating branch also includes a bypass solenoid valve, which is arranged on the bypass branch; according to the first change frequency, the flow of the bypass branch is controlled, including: When the first changing frequency is greater than or equal to the first preset frequency, the bypass solenoid valve is controlled to open to a first opening degree.

7. The control method according to claim 6, characterized in that: According to the first change frequency, controlling the flow of the bypass branch also includes: When the first change frequency is less than the first preset frequency, obtaining a second change frequency of the actual refrigerant pressure in a second preset time period; When the second changing frequency is greater than the second preset frequency, the bypass solenoid valve is controlled to open to a second opening degree; When the second changing frequency is less than the second preset frequency, the bypass solenoid valve is controlled to open to a third opening degree; The first opening is greater than or equal to the second opening, the second opening is greater than the third opening, and the second preset time length is less than the first preset time length.

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

9. A heat exchange system, characterized in that: include: A heat exchange circuit, comprising a compressor, a condenser, a throttling device and an evaporator connected in sequence; The refrigerant regulating branch is connected in series to the heat exchange circuit between the condenser and the throttling device; The control device for a heat exchange system as claimed in claim 8.

10. The heat exchange system according to claim 9, characterized in that: The refrigerant conditioning branch includes: liquid storage device; The first branch has two ends connected to the condenser and the liquid storage device respectively; The second branch has two ends respectively connected to the liquid storage device and the throttling device, and is connected to the upper end of the liquid storage device; The two ends of the bypass branch are respectively connected to the liquid storage device and the throttling device, and are connected to the lower end of the liquid storage device.

Images