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, and the heat exchange loop comprises a compressor; the refrigerant adjusting branch is connected with the heat exchange loop and is configured to adjust the refrigerant flow in the heat exchange loop; the control method comprises the steps that a first temperature difference value between the indoor temperature and a first preset temperature and a second temperature difference value between the outdoor temperature and the indoor temperature are determined; according to the first temperature difference value, the operation frequency of the compressor is controlled; and according to the operation frequency of the compressor and the second temperature difference value, the refrigerant storage amount of the refrigerant adjusting branch is adjusted. According to the embodiment, the amount of the refrigerant participating in heat exchange circulation in the heat exchange system can be adjusted, 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, wherein the heat exchange circuit includes a compressor; the refrigerant regulating branch is connected to the heat exchange circuit and is configured to regulate the refrigerant flow in the heat exchange circuit; the control method includes: determining a first temperature difference between the indoor temperature and a first preset temperature and a second temperature difference between the outdoor temperature and the indoor temperature; according to the first temperature difference, controlling the operating frequency of the compressor; and adjusting the refrigerant storage of the refrigerant regulating branch according to the operating frequency of the compressor and the second temperature difference.

[0010] In some optional embodiments, the operating frequency of the compressor is controlled according to the first temperature difference, including: when the first temperature difference is greater than or equal to the first preset difference, controlling the operating frequency of the compressor to operate at a high frequency; when the first temperature difference is less than the first preset difference, controlling the operating frequency of the compressor to operate at a low frequency.

[0011] In some optional embodiments, the refrigerant reserves of the refrigerant regulating branch are adjusted according to the operating frequency of the compressor and the second temperature difference, including: when the compressor operates at a high frequency and the second temperature difference is greater than or equal to the second preset difference, the refrigerant reserves of the refrigerant regulating branch are adjusted to the first refrigerant reserves; when the compressor operates at a high frequency and the second temperature difference is less than the second preset difference, the refrigerant reserves of the refrigerant regulating branch are adjusted to the second refrigerant reserves; when the compressor operates at a low frequency and the second temperature difference is greater than or equal to the second preset difference, the refrigerant reserves of the refrigerant regulating branch are adjusted to the third refrigerant reserves; when the compressor operates at a low frequency and the second temperature difference is less than the second preset difference, the refrigerant reserves of the refrigerant regulating branch are adjusted to the fourth refrigerant reserves; wherein, the first refrigerant reserves are less than the second refrigerant reserves, the second refrigerant reserves are less than the third refrigerant reserves, and the third refrigerant reserves are less than the fourth refrigerant reserves.

[0012] In some optional embodiments, the refrigerant regulating branch includes a connecting pipe, a liquid storage shell, a piston and a driving motor, wherein two ends of the connecting pipe are respectively connected to the heat exchange circuit and the liquid storage chamber, the piston abuts against the inner wall of the liquid storage shell, and the piston and the inner wall of the liquid storage shell define the liquid storage chamber; the driving motor is connected to the piston and can drive the piston to move relative to the liquid storage shell to change the liquid storage volume of the liquid storage chamber; wherein, regulating the refrigerant storage capacity of the refrigerant regulating branch includes: controlling the driving motor to rotate in a first direction to increase the refrigerant storage capacity of the refrigerant regulating branch; controlling the driving motor to rotate in a second direction to reduce the refrigerant storage capacity of the refrigerant regulating branch; wherein the first direction is opposite to the second direction.

[0013] In some optional embodiments, the refrigerant regulating branch includes a connecting pipe, a liquid storage shell, a piston and a driving motor, wherein the two ends of the connecting pipe are respectively connected to the heat exchange circuit and the liquid storage chamber; the piston is connected to the inner wall of the liquid storage shell, and the piston and the inner wall of the liquid storage shell define the liquid storage chamber; the driving motor is connected to the piston and can drive the piston to move relative to the liquid storage shell to change the liquid storage volume of the liquid storage chamber; wherein, before adjusting the refrigerant storage capacity of the refrigerant regulating branch, the control method also includes: obtaining the rate of change of the first temperature difference within a preset time length; when the rate of change is greater than or equal to the first preset rate of change, controlling the driving motor to rotate at a first speed for a target time length; when the rate of change is less than the first preset rate of change, and the rate of change is greater than or equal to the second preset rate of change, controlling the driving motor to rotate at a second speed for a target time length; when the rate of change is less than the second preset rate of change, controlling the driving motor to rotate at a third speed for a target time length; wherein the first speed is greater than the second speed, and the first speed is greater than the third speed.

[0014] In some optional embodiments, the target duration of the driving motor rotation is determined as follows:

[0015] T=πR 2 |D1-D0| / 4V

[0016] Among them, T is the rotation time of the motor, π is the pi, R is the inner diameter of the liquid storage shell, D1 is the piston height corresponding to the target refrigerant storage, D0 is the piston height corresponding to the current refrigerant storage, and V is the speed of the drive motor.

[0017] In some optional embodiments, the heat exchange circuit also includes an indoor heat exchanger connected to the compressor; the control method also includes: after adjusting the refrigerant storage capacity of the refrigerant regulating branch according to the operating frequency of the compressor and the second temperature difference, obtaining the current temperature of the indoor heat exchanger; determining a third temperature difference between the current temperature and the second preset temperature; when the third temperature difference is less than the third preset difference, reducing the refrigerant storage capacity of the refrigerant regulating branch; when the third temperature difference is greater than the fourth preset difference, increasing the refrigerant storage capacity of the refrigerant regulating branch; wherein the fourth preset difference is greater than or equal to the third preset difference.

[0018] 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.

[0019] According to an embodiment of the third aspect of the present application, a heat exchange system is provided, comprising: a heat exchange circuit, including a compressor; a refrigerant regulating branch, connected to the heat exchange circuit and configured to regulate the refrigerant flow in the heat exchange circuit; 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 shell; a piston, which abuts against the inner wall of the liquid storage shell and defines a liquid storage cavity with the inner wall of the liquid storage shell; a connecting pipe, whose two ends are respectively connected to the heat exchange circuit and the liquid storage cavity; and a driving motor, which is connected to the piston and can drive the piston to move relative to the liquid storage shell to change the liquid storage volume of the liquid storage cavity.

[0021] 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:

[0022] The heat exchange system includes a heat exchange circuit and a refrigerant regulating branch, and the heat exchange circuit includes a compressor; the refrigerant regulating branch is connected to the heat exchange circuit, and the refrigerant regulating branch is configured to regulate the refrigerant flow in the heat exchange circuit. In this way, the refrigerant in the heat exchange system can enter the refrigerant regulating branch to store the refrigerant in the refrigerant regulating branch, thereby reducing the amount of refrigerant participating in the heat exchange cycle of the heat exchange circuit. Similarly, the refrigerant in the refrigerant regulating branch can flow into the heat exchange circuit to increase the amount of refrigerant participating in the heat exchange cycle of the heat exchange circuit. In this embodiment, the operating frequency of the compressor is controlled according to the first temperature difference between the indoor temperature and the first preset temperature, and the refrigerant storage of the refrigerant regulating branch is adjusted according to the operating frequency of the compressor and the second temperature difference between the outdoor temperature and the indoor temperature. In this way, the amount of refrigerant participating in the heat exchange cycle of the heat exchange circuit is adjusted, thereby improving the rationality of the refrigerant participating in the heat exchange cycle of the heat exchange system under different working conditions, and improving the performance of the heat exchange system.

[0023] 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

[0024] 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:

[0025] Figure 1 is a flow chart of a control method for a heat exchange system provided by an embodiment of the present disclosure;

[0026] Figure 2 is a flow chart of another control method for a heat exchange system provided by an embodiment of the present disclosure;

[0027] Figure 3 is a flow chart of another control method for a heat exchange system provided by an embodiment of the present disclosure;

[0028] Figure 4 is a structural schematic diagram of a heat exchange system provided by an embodiment of the present disclosure;

[0029] Figure 5 is a structural schematic diagram of a refrigerant regulating branch provided by an embodiment of the present disclosure;

[0030] Figure 6 is a schematic cross-sectional structure diagram of a refrigerant regulating branch provided in an embodiment of the present disclosure;

[0031] Figure 7 It is a structural schematic diagram of a control device for a heat exchange system provided in an embodiment of the present disclosure.

[0032] Reference numerals:

[0033] 100, processor; 101, memory; 102, communication interface; 103, bus; 200, compressor; 300, outdoor heat exchanger; 400, indoor heat exchanger; 500, refrigerant regulation branch; 510, liquid storage shell; 520, piston; 530, drive motor; 540, first connecting pipe; 550, second connecting pipe; 560, transmission device; 570, telescopic hose; 600, throttling device. DETAILED DESCRIPTION

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] The present disclosure provides a heat exchange system, such as Figure 4 As shown, the heat exchange system includes a heat exchange circuit and a refrigerant regulating branch 500. The refrigerant regulating branch 500 is connected to the heat exchange circuit, and the refrigerant regulating branch 500 is configured to regulate the refrigerant flow in the heat exchange circuit.

[0041] The heat exchange system includes a heat exchange circuit and a refrigerant regulating branch 500, the refrigerant regulating branch 500 is connected to the heat exchange circuit, and the refrigerant regulating branch 500 is configured to regulate the refrigerant flow in the heat exchange circuit. In this way, the refrigerant in the heat exchange system can enter the refrigerant regulating branch 500 to store the refrigerant in the refrigerant regulating branch 500, reduce the refrigerant flow in the heat exchange circuit, and thus reduce the amount of refrigerant participating in the heat exchange cycle of the heat exchange circuit. Similarly, the refrigerant in the refrigerant regulating branch 500 can flow into the heat exchange circuit to increase the amount of refrigerant participating in the heat exchange cycle of the heat exchange circuit, thereby increasing the amount of refrigerant participating in the heat exchange cycle of the heat exchange circuit. In this way, the amount of refrigerant participating in the heat exchange cycle of the heat exchange circuit is regulated, thereby improving the rationality of the refrigerant participating in the heat exchange cycle of the heat exchange system under different working conditions, and improving the performance of the heat exchange system.

[0042] Furthermore, the heat exchange circuit includes a compressor 200, an outdoor heat exchanger 300, a throttle and an indoor heat exchanger 400 which are sequentially connected through heat exchange pipelines.

[0043] When the heat exchange system operates in cooling mode, the refrigerant flows out of the compressor 200, flows through the outdoor heat exchanger 300, the throttling device 600 and the indoor heat exchanger 400 in sequence, and then flows back into the compressor 200 to complete a refrigeration cycle. At this time, the outdoor heat exchanger 300 acts as a condenser, and the refrigerant condenses and releases heat in the outdoor heat exchanger 300. The indoor heat exchanger 400 acts as an evaporator, and the refrigerant evaporates and absorbs heat in the indoor heat exchanger 400 to absorb indoor heat, provide cooling to the room, and reduce the indoor temperature.

[0044] When the heat exchange system operates in heating mode, the refrigerant flows out of the compressor 200, passes through the indoor heat exchanger 400, the throttling device 600 and the outdoor heat exchanger 300 in sequence, and then flows back into the compressor 200 to complete a heating cycle. At this time, the indoor heat exchanger 400 acts as a condenser, and the refrigerant condenses and releases heat in the indoor heat exchanger 400 to increase the heat indoors and increase the indoor temperature. The outdoor heat exchanger 300 acts as an evaporator, and the refrigerant evaporates and absorbs heat in the outdoor heat exchanger 300, and becomes a gaseous refrigerant to be supplied to the compressor 200.

[0045] Alternatively, if Figure 5 and Figure 6 As shown, the refrigerant regulating branch 500 includes a connecting pipe 540 (hereinafter referred to as the first connecting pipe 540 for the sake of distinction), a liquid storage shell 510, a piston 520 and a driving motor 530, wherein the two ends of the first connecting pipe 540 are respectively connected to the heat exchange circuit and the liquid storage cavity. The piston 520 is connected to the inner side wall of the liquid storage shell 510, and the piston 520 and the inner side wall of the liquid storage shell 510 define a liquid storage cavity. The driving motor 530 is connected to the piston 520, and the driving motor 530 can drive the piston 520 to move relative to the liquid storage shell 510 to change the liquid storage volume of the liquid storage cavity.

[0046] In this embodiment, the driving motor 530 is connected to the piston 520, and the driving motor 530 can drive the piston 520 to move relative to the liquid storage shell 510, so that the volume of the liquid storage cavity defined by the piston 520 and the inner side wall of the liquid storage shell 510 can be changed, thereby changing the amount of refrigerant that can be stored in the liquid storage cavity to change the refrigerant flow in the heat exchange circuit. The two ends of the first connecting pipe 540 are respectively connected to the heat exchange circuit and the liquid storage cavity, so that the refrigerant in the heat exchange circuit can flow into the liquid storage cavity through the first connecting pipe 540, or the refrigerant in the liquid storage cavity can flow back to the heat exchange circuit through the first connecting pipe 540 to adjust the amount of refrigerant in the heat exchange circuit.

[0047] Furthermore, one end of the first connecting pipe 540 is connected to the heat exchange pipeline between the indoor heat exchanger 400 and the throttling device 600. In this way, when the heat exchange system operates in the heating mode, the refrigerant pressure in the liquid storage chamber is the same as the refrigerant pressure flowing out of the indoor heat exchanger 400 (equivalent to the condenser). When the heat exchange system operates in the cooling mode, the refrigerant pressure in the liquid storage chamber is the same as the refrigerant pressure flowing out of the throttling device 600.

[0048] Optionally, one end of the first connecting pipe 540 is connected to the heat exchange pipeline between the outdoor heat exchanger 300 and the throttling device 600. In this way, when the heat exchange system operates in the heating mode, the refrigerant pressure in the liquid storage chamber is the same as the refrigerant pressure flowing out of the throttling device 600. When the heat exchange system operates in the cooling mode, the refrigerant pressure in the liquid storage chamber is the same as the refrigerant pressure flowing out of the outdoor heat exchanger 300 (equivalent to the condenser).

[0049] Optionally, the refrigerant regulating branch 500 further includes a piston connecting rod, and both ends of the piston connecting rod are connected to the piston 520 and the driving end of the driving motor 530 respectively.

[0050] Optionally, the refrigerant regulating branch 500 further includes a transmission device 560 , which is connected between the piston 520 and the driving end of the driving motor 530 to convert the rotation of the driving motor 530 into a linear movement of the piston 520 .

[0051] For example, the transmission device 560 includes a gear and a rack. The gear is connected to the driving end of the driving motor 530, one end of the rack is connected to the piston 520, and the other end of the rack is meshed with the gear. In this way, the driving motor 530 rotates to drive the gear to rotate, and when the gear rotates, the meshing of the gear and the rack drives the rack to move, thereby driving the piston 520 to move linearly.

[0052] Optionally, when the driving motor 530 rotates in a first direction, the driving motor 530 drives the piston 520 to move in a direction away from the first connecting tube 540. The first connecting tube 540 is connected to the liquid storage chamber, so as to increase the volume of the liquid storage chamber, thereby increasing the refrigerant storage capacity of the refrigerant regulating branch 500. When the driving motor 530 rotates in a second direction, which is opposite to the first direction, the driving motor 530 drives the piston 520 to move in a direction toward the first connecting tube 540. In this way, the volume of the liquid storage chamber is reduced, thereby reducing the refrigerant storage capacity of the refrigerant regulating branch 500.

[0053] Exemplarily, the refrigerant regulating branch 500 further includes a pressure detection sensor, which is disposed on the first connecting pipe 540 and is used to detect the refrigerant pressure in the liquid storage chamber.

[0054] In this embodiment, the first connecting tube 540 is connected to the liquid storage chamber, and the pressure in the first connecting tube 540 is the same as the pressure in the liquid storage chamber. The pressure in the liquid storage chamber can also be obtained by arranging a pressure detection sensor in the first connecting tube 540. In addition, when the piston 520 moves in the liquid storage housing 510, the pressure detection device can be reduced from hindering the movement of the piston 520, thereby improving the operating stability and reliability of the heat exchange system.

[0055] Optionally, the first connecting pipe 540 is connected to the upper side wall of the liquid storage housing 510 , and the upper side wall of the liquid storage housing 510 is arranged opposite to the piston 520 .

[0056] In some optional embodiments, the refrigerant regulating branch 500 further includes a second connecting pipe 550 and a telescopic hose 570. The two ends of the second connecting pipe 550 are respectively connected to the heat exchange circuit and the liquid storage chamber. The telescopic hose 570 is arranged in the liquid storage chamber, and the two ends of the telescopic hose 570 are respectively connected to the first connecting pipe 540 and the piston 520, and the opening direction of the end of the telescopic hose 570 connected to the piston 520 extends along the radial direction of the liquid storage housing 510.

[0057] In this embodiment, when the refrigerant flowing into the liquid storage chamber through the first connecting pipe 540 is the refrigerant flowing out of the throttling device 600, the refrigerant flowing into the liquid storage chamber is a gas-liquid two-phase refrigerant, so that the upper part of the liquid storage chamber stores gaseous refrigerant. The two ends of the second connecting pipe 550 are respectively connected to the heat exchange circuit and the liquid storage chamber. The telescopic hose 570 is arranged in the liquid storage chamber, and the two ends of the telescopic hose 570 are respectively connected to the first connecting pipe 540 and the piston 520, and the opening direction of the end of the telescopic hose 570 connected to the piston 520 extends along the radial direction of the liquid storage shell 510. The refrigerant can flow into the liquid storage chamber through the first connecting pipe 540 and the telescopic hose 570, and flow out through the second connecting pipe 550. Specifically, the second connecting pipe 550 is connected to the upper side wall of the liquid storage shell 510. In this way, the gaseous refrigerant in the upper part of the liquid storage chamber can flow out of the liquid storage chamber through the second connecting pipe 550, increasing the liquid refrigerant stored in the liquid storage chamber and increasing the amount of refrigerant stored in the liquid storage chamber.

[0058] Furthermore, the telescopic hose 570 can be extended or contracted by the piston 520, so that one end of the telescopic hose 570 can also be connected to the piston 520 during the movement of the piston 520. Furthermore, the opening direction of the end of the telescopic hose 570 connected to the piston 520 extends along the radial direction of the liquid storage housing 510, so as to reduce the situation where the piston 520 blocks the opening of the telescopic hose 570, so that the refrigerant cannot flow through the telescopic hose 570. The operation stability and reliability of the refrigerant regulating branch 500 are improved. Specifically, the piston 520 moves along the axial direction of the liquid storage housing 510.

[0059] Figure 11 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.

[0060] S011, the controller determines a first temperature difference between the indoor temperature and a first preset temperature and a second temperature difference between the outdoor temperature and the indoor temperature.

[0061] S012: According to the first temperature difference, the controller controls the operating frequency of the compressor.

[0062] S013, according to the operating frequency of the compressor and the second temperature difference, the controller adjusts the refrigerant storage amount of the refrigerant regulating branch.

[0063] In this embodiment, the controller can control the operating frequency of the compressor according to the first temperature difference between the indoor temperature and the first preset temperature, and adjust the refrigerant storage of the refrigerant regulating branch according to the operating frequency of the compressor and the second temperature difference between the outdoor temperature and the indoor temperature. In this way, the amount of refrigerant participating in the heat exchange cycle of the heat exchange circuit is adjusted, thereby improving the rationality of the refrigerant participating in the heat exchange cycle of the heat exchange system under different working conditions and improving the performance of the heat exchange system.

[0064] The second temperature difference is the absolute value of the difference between the outdoor temperature and the indoor temperature, and the first temperature difference is the absolute value of the difference between the indoor temperature and the first preset temperature.

[0065] 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.

[0066] S021, the controller determines a first temperature difference between the indoor temperature and a first preset temperature and a second temperature difference between the outdoor temperature and the indoor temperature.

[0067] S022: When the first temperature difference is greater than or equal to the first preset difference, the controller controls the operating frequency of the compressor to high frequency operation.

[0068] S023, when the first temperature difference is less than the first preset difference, the controller controls the operating frequency of the compressor to operate at a low frequency.

[0069] In this embodiment, when the first temperature difference is greater than or equal to the first preset difference, it means that the heat exchange amount required by the heat exchange system increases, and the controller controls the operating frequency of the compressor to high frequency operation to increase the heat exchange amount of the heat exchange system.

[0070] When the first temperature difference is less than the first preset difference, it means that the heat exchange amount required by the heat exchange system is reduced. At this time, the heat exchange amount and the operating load of the heat exchange system can be reduced, and the compressor can be controlled to operate at a low frequency.

[0071] S024: When the compressor is running at a high frequency and the second temperature difference is greater than or equal to the second preset difference, the controller adjusts the refrigerant storage amount of the refrigerant regulating branch to the first refrigerant storage amount.

[0072] S025, when the compressor operates at a high frequency and the second temperature difference is less than the second preset difference, the controller adjusts the refrigerant storage capacity of the refrigerant regulating branch to the second refrigerant storage capacity.

[0073] S026: When the compressor operates at a low frequency and the second temperature difference is greater than or equal to the second preset difference, the controller adjusts the refrigerant storage capacity of the refrigerant regulating branch to a third refrigerant storage capacity.

[0074] S027: When the compressor operates at a low frequency and the second temperature difference is less than the second preset difference, the controller adjusts the refrigerant storage capacity of the refrigerant regulating branch to a fourth refrigerant storage capacity.

[0075] Among them, the first refrigerant storage is smaller than the second refrigerant storage, the second refrigerant storage is smaller than the third refrigerant storage, and the third refrigerant storage is smaller than the fourth refrigerant storage.

[0076] In this embodiment, when the second temperature difference between the indoor temperature and the outdoor temperature is greater than or equal to the second preset difference, the indoor temperature is more affected by the outdoor temperature, and the heating or cooling capacity of the heat exchange system is increased to reduce the difference between the indoor temperature and the first preset temperature. When the second temperature difference is less than the second preset difference, the indoor temperature is less affected by the outdoor temperature, and the heat exchange system has a smaller reference factor to the outdoor temperature when setting the heating or cooling capacity.

[0077] The first refrigerant amount is less than the second refrigerant amount, and the third refrigerant reserve is less than the fourth refrigerant reserve. When the second temperature difference is greater than or equal to the second preset difference, the amount of refrigerant participating in the heat exchange cycle is greater than the amount of refrigerant participating in the heat exchange cycle when the second temperature difference is less than the second preset difference. In this way, when the second temperature difference is large (relative to the second preset difference), the refrigerant reserve of the refrigerant regulating branch is reduced, the amount of refrigerant participating in the heat exchange cycle is increased, and the heat exchange amount and performance of the heat exchange system are improved. And when the second temperature difference is small (relative to the second preset difference), the refrigerant reserve of the refrigerant regulating branch is increased to reduce the amount of refrigerant participating in the heat exchange cycle, reduce the increase in energy consumption when more refrigerant participates in the heat exchange cycle, and improve the heat exchange performance of the heat exchange system.

[0078] When the compressor is running at a high frequency and the second temperature difference is less than the second preset difference, the second refrigerant storage capacity of the refrigerant regulating branch is less than the third refrigerant storage capacity of the refrigerant regulating branch when the compressor is running at a low frequency and the second temperature difference is greater than or equal to the second preset difference. The influence of the operating frequency of the compressor on the refrigerant storage capacity of the refrigerant regulating branch is greater than the influence of the second temperature difference on the refrigerant storage capacity of the refrigerant regulating branch.

[0079] For example, when the compressor is running at high frequency and the difference between the outdoor temperature and the indoor temperature is 8 degrees, the first refrigerant amount of the refrigerant regulating branch is 0. When the compressor is running at high frequency and the difference between the outdoor temperature and the indoor temperature is 2 degrees, the second refrigerant amount of the refrigerant regulating branch is 10% of the maximum refrigerant amount of the refrigerant regulating branch.

[0080] When the compressor is running at a low frequency and the difference between the outdoor temperature and the indoor temperature is 8 degrees, the third refrigerant amount of the refrigerant regulating branch is 90% of the maximum refrigerant amount of the refrigerant regulating branch. When the compressor is running at a low frequency and the difference between the outdoor temperature and the indoor temperature is 2 degrees, the fourth refrigerant amount of the refrigerant regulating branch is the maximum refrigerant amount of the refrigerant regulating branch.

[0081] In some optional embodiments, the controller adjusts the liquid storage volume of the liquid storage chamber including:

[0082] The controller controls the driving motor to rotate along a first direction to increase the liquid storage volume of the liquid storage chamber; the controller controls the driving motor to rotate along a second direction to reduce the liquid storage volume of the liquid storage chamber.

[0083] The first direction is opposite to the second direction.

[0084] In this embodiment, when the driving motor rotates in a first direction, the driving motor drives the piston to move in a direction away from the first connecting tube. The first connecting tube is connected to the liquid storage chamber, so as to increase the liquid storage volume of the liquid storage chamber. When the driving motor rotates in a second direction, which is opposite to the first direction, the driving motor drives the piston to move in a direction toward the first connecting tube. In this way, the liquid storage volume of the liquid storage chamber is reduced.

[0085] Exemplarily, before adjusting the refrigerant storage amount of the refrigerant regulating branch, the control method further includes:

[0086] The controller obtains the rate of change of the first temperature difference within the preset time. Optionally, the rate of change is the first temperature difference at the end of the preset time minus the first temperature difference at the beginning of the preset time divided by the preset time.

[0087] When the change rate is greater than or equal to the first preset change rate, the controller controls the drive motor to rotate at the first speed for a target time period.

[0088] When the change rate is less than the first preset change rate and greater than or equal to the second preset change rate, the controller controls the drive motor to rotate at the second speed for a target time period.

[0089] When the change rate is less than the second preset change rate, the controller controls the drive motor to rotate at the third speed for a target time period.

[0090] The first rotational speed is greater than the second rotational speed, and the first rotational speed is greater than the third rotational speed.

[0091] In this embodiment, adjusting the refrigerant storage capacity of the refrigerant regulating branch is to adjust the liquid storage volume of the liquid storage chamber. The controller can obtain the change rate of the first temperature difference within a preset time period, and control the speed of the driving motor according to the change rate, so as to improve the sensitivity of the change of the refrigerant storage capacity of the refrigerant regulating branch and improve the cooling or heating capacity of the heat exchange system.

[0092] The first speed is greater than the second speed, that is, when the first temperature difference increases and the rate of increase is faster, the speed of the drive motor increases to increase the rate at which the refrigerant regulating branch replenishes the refrigerant to the heat exchange circuit. Furthermore, the second preset change rate is 0. When the change rate is less than the second preset change rate, that is, when the second temperature difference decreases, the refrigerant storage capacity of the refrigerant regulating branch increases, and refrigerant needs to be replenished in the refrigerant regulating branch. The third speed is less than the first speed. In this way, the rate of increasing the refrigerant in the refrigerant regulating branch is reduced, that is, the rate at which the heat exchange circuit reduces the refrigerant, thereby reducing the flash evaporation caused by a sudden large reduction in the refrigerant in the heat exchange circuit, and the gaseous refrigerant after the flash evaporation enters the throttling device to generate noise, thereby improving the user experience.

[0093] Furthermore, the controller determines the target duration of the rotation of the drive motor in the following manner:

[0094] T=πR 2 |D1-D0| / 4V

[0095] Among them, T is the rotation time of the motor, π is the pi, R is the inner diameter of the liquid storage shell, D1 is the piston height corresponding to the target refrigerant storage, D0 is the piston height corresponding to the current refrigerant storage, and V is the speed of the drive motor.

[0096] The speed V of the driving motor may be the first speed, the second speed or the third speed, or may be the average speed of the first speed, the second speed and the third speed.

[0097] In this embodiment, the inner diameter of the liquid storage shell is constant, that is, the inner diameter of the liquid storage cavity is constant. The piston and the inner side wall of the liquid storage shell define the liquid storage cavity, and the liquid storage volume in the liquid storage cavity can be determined by judging the height of the piston, so that the liquid storage volume in the liquid storage cavity is the target liquid storage volume, that is, the refrigerant storage amount of the refrigerant regulating branch is the target refrigerant storage amount. Optionally, the target refrigerant storage amount is the first refrigerant storage amount, the second refrigerant storage amount, the third refrigerant storage amount, or the fourth refrigerant storage amount.

[0098] 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.

[0099] S031, the controller determines a first temperature difference between the indoor temperature and a first preset temperature and a second temperature difference between the outdoor temperature and the indoor temperature.

[0100] S032: According to the first temperature difference, the controller controls the operating frequency of the compressor.

[0101] S033, according to the operating frequency of the compressor and the second temperature difference, the controller adjusts the refrigerant storage amount of the refrigerant regulating branch.

[0102] S034, after the controller adjusts the refrigerant storage amount of the refrigerant regulating branch according to the operating frequency of the compressor and the second temperature difference, the controller obtains the current temperature of the indoor heat exchanger.

[0103] S035, the controller determines a third temperature difference between the current temperature and the second preset temperature.

[0104] The third temperature difference is the absolute value of the difference between the current temperature and the second preset temperature. The second preset temperature can be set when the heat exchange system is produced. Optionally, the second preset temperature is the lowest temperature of the indoor heat exchanger when the heat exchange system is in heating operation; or the second preset temperature is the highest temperature of the indoor heat exchanger when the heat exchange system is in cooling operation.

[0105] S036: When the third temperature difference is less than the third preset difference, the controller reduces the refrigerant storage capacity of the refrigerant regulating branch.

[0106] S037, when the third temperature difference is greater than the fourth preset difference, the controller increases the refrigerant storage capacity of the refrigerant regulating branch.

[0107] The fourth preset difference is greater than or equal to the second preset difference.

[0108] In this embodiment, after the controller adjusts the refrigerant storage of the refrigerant regulating branch, the controller obtains the current temperature of the indoor heat exchanger. When the third temperature difference is greater than the fourth preset difference, it means that the heat or cold transferred by the indoor heat exchanger to the room can cause the indoor temperature to continue to increase or decrease, so as to further reduce the difference between the indoor temperature and the user preset temperature. At this time, the refrigerant storage of the refrigerant regulating branch is increased to reduce the amount of refrigerant participating in the heat exchange cycle, and reduce the increase in energy consumption when more refrigerant participates in the heat exchange cycle, so as to improve the heat exchange performance of the heat exchange system. When the third temperature difference is less than the third preset difference, it means that the heat or cold transferred by the indoor heat exchanger to the room is small, and it is necessary to further increase or decrease the temperature of the indoor heat exchanger to increase the heat or cold transferred by the indoor heat exchanger to the room. The controller reduces the refrigerant storage of the refrigerant regulating branch to increase the amount of refrigerant participating in the heat exchange cycle and improve the cooling capacity of the heat exchange system.

[0109] Combination Figure 7 As 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 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.

[0110] 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.

[0111] 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.

[0112] 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.

[0113] The embodiments of the present disclosure provide a heat exchange system, including: 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 a feasible heat exchange system body, thereby realizing other feasible embodiments.

[0114] 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.

[0115] The computer-readable storage medium mentioned above may be a transient computer-readable storage medium or a non-transitory computer-readable storage medium.

[0116] The technical solution of the embodiment of the present disclosure can be embodied in the form of a software product, which is stored in a storage medium and includes one or more instructions for enabling a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in the embodiment of the present disclosure. The aforementioned storage medium may be a non-transient storage medium, including: a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and other media that can store program codes, or a transient storage medium.

[0117] 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.

[0118] 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.

[0119] 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.

[0120] 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, wherein the heat exchange circuit includes a compressor; the refrigerant regulating branch is connected to the heat exchange circuit and is configured to regulate the refrigerant flow in the heat exchange circuit; and the control method includes: determining a first temperature difference between the indoor temperature and a first preset temperature and a second temperature difference between the outdoor temperature and the indoor temperature; controlling the operating frequency of the compressor according to the first temperature difference; The refrigerant storage capacity of the refrigerant regulating branch is adjusted according to the operating frequency of the compressor and the second temperature difference.

2. The control method according to claim 1, characterized in that: According to the first temperature difference, controlling the operating frequency of the compressor includes: When the first temperature difference is greater than or equal to the first preset difference, controlling the operating frequency of the compressor to operate at a high frequency; When the first temperature difference is less than the first preset difference, the operating frequency of the compressor is controlled to operate at a low frequency.

3. The control method according to claim 2, characterized in that: According to the operating frequency of the compressor and the second temperature difference, the refrigerant storage capacity of the refrigerant regulating branch is adjusted, including: When the compressor is running at a high frequency and the second temperature difference is greater than or equal to the second preset difference, adjusting the refrigerant storage amount of the refrigerant regulating branch to the first refrigerant storage amount; When the compressor is running at a high frequency and the second temperature difference is less than the second preset difference, adjusting the refrigerant storage amount of the refrigerant regulating branch to the second refrigerant storage amount; When the compressor is running at a low frequency and the second temperature difference is greater than or equal to the second preset difference, the refrigerant storage amount of the refrigerant regulating branch is adjusted to a third refrigerant storage amount; When the compressor operates at a low frequency and the second temperature difference is less than the second preset difference, adjusting the refrigerant storage amount of the refrigerant regulating branch to a fourth refrigerant storage amount; Among them, the first refrigerant storage is smaller than the second refrigerant storage, the second refrigerant storage is smaller than the third refrigerant storage, and the third refrigerant storage is smaller than the fourth refrigerant storage.

4. The control method according to claim 1, characterized in that: The refrigerant regulating branch includes a connecting pipe, a liquid storage shell, a piston and a driving motor, wherein the two ends of the connecting pipe are respectively connected to the heat exchange circuit and the liquid storage cavity, the piston abuts against the inner side wall of the liquid storage shell, and the piston and the inner side wall of the liquid storage shell define the liquid storage cavity; the driving motor is connected to the piston and can drive the piston to move relative to the liquid storage shell to change the liquid storage volume of the liquid storage cavity; Among them, regulating the refrigerant storage of the refrigerant regulating branch includes: Controlling the driving motor to rotate in a first direction to increase the refrigerant storage capacity of the refrigerant regulating branch; Controlling the driving motor to rotate in a second direction to reduce the refrigerant storage amount of the refrigerant regulating branch; The first direction is opposite to the second direction.

5. The control method according to any one of claims 1 to 4, characterized in that: The refrigerant regulating branch includes a connecting pipe, a liquid storage shell, a piston and a driving motor, wherein the two ends of the connecting pipe are respectively connected to the heat exchange circuit and the liquid storage cavity; the piston is connected to the inner side wall of the liquid storage shell, and the piston and the inner side wall of the liquid storage shell define the liquid storage cavity; the driving motor is connected to the piston, and can drive the piston to move relative to the liquid storage shell to change the liquid storage volume of the liquid storage cavity; Wherein, before adjusting the refrigerant storage amount of the refrigerant regulating branch, the control method further includes: Obtaining a change rate of a first temperature difference within a preset time period; When the change rate is greater than or equal to the first preset change rate, controlling the drive motor to rotate at the first speed for a target time; When the change rate is less than the first preset change rate and the change rate is greater than or equal to the second preset change rate, controlling the drive motor to rotate at the second speed for a target time; When the change rate is less than the second preset change rate, controlling the drive motor to rotate at a third speed for a target time period; The first rotational speed is greater than the second rotational speed, and the first rotational speed is greater than the third rotational speed.

6. The control method according to claim 5, characterized in that: Determine the target duration of the drive motor rotation as follows: T=πR 2 |D1-D0| / 4V Among them, T is the rotation time of the motor, π is the pi, R is the inner diameter of the liquid storage shell, D1 is the piston height corresponding to the target refrigerant storage, D0 is the piston height corresponding to the current refrigerant storage, and V is the speed of the drive motor.

7. The control method according to any one of claims 1 to 4, characterized in that: The heat exchange circuit also includes an indoor heat exchanger connected to the compressor; and the control method also includes: After adjusting the refrigerant storage amount of the refrigerant regulating branch according to the operating frequency of the compressor and the second temperature difference, the current temperature of the indoor heat exchanger is obtained; determining a third temperature difference between the current temperature and the second preset temperature; When the third temperature difference is less than the third preset difference, reducing the refrigerant storage amount of the refrigerant regulating branch; When the third temperature difference is greater than the fourth preset difference, increasing the refrigerant storage capacity of the refrigerant regulating branch; The fourth preset difference is greater than or equal to the third preset difference.

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, including a compressor; A refrigerant regulating branch, connected to the heat exchange circuit, and configured to regulate the refrigerant flow in the heat exchange circuit; and, 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: A liquid storage housing; The piston abuts against the inner side wall of the liquid storage shell and defines a liquid storage cavity with the inner side wall of the liquid storage shell; A connecting pipe, both ends of which are connected to the heat exchange circuit and the liquid storage chamber respectively; The driving motor is connected to the piston and can drive the piston to move relative to the liquid storage housing to change the liquid storage volume of the liquid storage chamber.

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