Control method for heat pump system, heat pump system, and storage medium

Abstract

The application discloses a kind of control method of heat pump system, heat pump system and storage medium.Therein, the first heat exchanger of heat pump system, throttling component and second heat exchanger are sequentially connected, first heat exchanger, second heat exchanger, the exhaust port of compressor and the back gas port of compressor are connected with reversing component, and first heat exchanger is heat exchange connected with energy storage device, and the method comprises: when receiving the starting instruction of heating mode, control compressor starts, control reversing component to operate in refrigeration valve position, and the first heat exchanger corresponding to refrigeration valve position is in evaporative state, and second heat exchanger is in condensing state;When compressor operation reaches preset condition, control reversing component to operate in heating valve position to operate in heating mode, and the first heat exchanger corresponding to heating valve position is in condensing state, and second heat exchanger is in evaporative state.The application aims at improving the operating stability of heat pump system when heating starts, to protect compressor.

Description

Technical Field

[0001] This invention relates to the field of heat pump technology, and more particularly to a control method for a heat pump system, a heat pump system, and a storage medium. Background Technology

[0002] Heat pump systems can be equipped with energy storage devices (such as water tanks) to store the energy of the heat exchanger using water or other energy storage media. However, when starting up for heating in low-temperature environments, the compressor may experience excessively low exhaust temperature or low low-pressure due to prolonged cold-state operation. This situation can affect the stability of system operation and even damage the compressor if it persists for an extended period. Summary of the Invention

[0003] The main objective of this invention is to provide a control method for a heat pump system, a heat pump system, and a storage medium, with the aim of improving the operational stability of the heat pump system during heating start-up and protecting the compressor.

[0004] To achieve the above objectives, the present invention provides a control method for a heat pump system. The heat pump system includes a compressor, a reversing assembly, a first heat exchanger, a throttling device, a second heat exchanger, and an energy storage device. The first heat exchanger, the throttling device, and the second heat exchanger are connected sequentially. The first heat exchanger, the second heat exchanger, the exhaust port of the compressor, and the return port of the compressor are all connected to the reversing assembly. The first heat exchanger is heat-exchange connected to the energy storage device. The control method for the heat pump system includes the following steps:

[0005] When a start command for heating mode is received, the compressor is controlled to start, and the reversing assembly is controlled to operate in the refrigeration valve position. The first heat exchanger corresponding to the refrigeration valve position is in the evaporation state, and the second heat exchanger is in the condensation state.

[0006] When the compressor reaches the preset operating conditions, the reversing assembly is controlled to operate in the heating valve position to run the heating mode. The first heat exchanger corresponding to the heating valve position is in the condensing state and the second heat exchanger is in the evaporating state.

[0007] Optionally, the step of controlling the compressor to start and controlling the reversing assembly to operate in the refrigeration valve position when a start command for the heating mode is received includes:

[0008] When a start command for heating mode is received, the ambient temperature and / or the first discharge temperature of the compressor and / or the first energy storage temperature in the energy storage device are obtained.

[0009] When the ambient temperature and / or the first exhaust temperature and / or the first energy storage temperature meet the abnormal start-up conditions of the compressor, the compressor is controlled to start, and the reversing assembly is controlled to operate in the refrigeration valve position.

[0010] Optionally, the abnormal initiation condition includes at least one of the following conditions:

[0011] The ambient temperature is less than or equal to the preset ambient temperature;

[0012] The first exhaust temperature is less than or equal to the first energy storage temperature.

[0013] Optionally, after the step of obtaining the ambient temperature and / or the first discharge temperature of the compressor and / or the first energy storage temperature within the energy storage device, the method further includes:

[0014] When the ambient temperature and / or the first exhaust temperature and / or the first energy storage temperature do not meet the abnormal start-up conditions of the compressor, the compressor is controlled to start and the reversing assembly is controlled to operate in the heating valve position.

[0015] Optionally, before the step of controlling the commutation assembly to operate in the refrigeration valve position, the method further includes:

[0016] When a start command for heating mode is received, the compressor is controlled to start, the fan corresponding to the second heat exchanger is controlled to shut down, and / or the throttling component is controlled to operate at an opening greater than the throttling opening.

[0017] Optionally, before the step of controlling the reversing assembly to operate in the heating valve position to run the heating mode when the compressor reaches the preset operating conditions, the method further includes:

[0018] During the operation of the reversing assembly in the refrigeration valve position, the second discharge temperature of the compressor and the second energy storage temperature in the energy storage device are obtained;

[0019] When the second energy storage temperature is greater than the second exhaust temperature, and the temperature difference between the second energy storage temperature and the second exhaust temperature is less than a preset value, the throttling component is controlled to reduce its opening.

[0020] Optionally, after the steps of controlling the compressor to start and controlling the commutation assembly to operate in the refrigeration valve position, the method further includes:

[0021] When the compressor fails to meet the preset conditions, the third energy storage temperature inside the energy storage device is obtained.

[0022] When the third energy storage temperature is lower than the preset temperature, the compressor is controlled to stop.

[0023] When the third energy storage temperature is greater than or equal to the preset temperature, the heat pump system is controlled to maintain the current state of operation.

[0024] Optionally, the initial valve position of the reversing assembly is the heating valve position, and before the step of controlling the compressor to stop, the method further includes:

[0025] When the third energy storage temperature is lower than the preset temperature, the reversing component is controlled to switch to the heating valve position.

[0026] Optionally, the preset conditions include at least one of the following conditions:

[0027] The third exhaust temperature of the compressor is greater than the fourth energy storage temperature in the energy storage device, and the temperature difference between the third exhaust temperature and the fourth energy storage temperature is greater than a preset temperature difference value.

[0028] The temperature of the second heat exchanger is higher than the preset protection temperature.

[0029] Optionally, the compressor is a fixed-frequency compressor.

[0030] In addition, to achieve the above objectives, this application also proposes a heat pump system, which includes a control device, a compressor, a reversing assembly, a first heat exchanger, a throttling component, a second heat exchanger, and an energy storage device. The first heat exchanger, the throttling component, and the second heat exchanger are connected in sequence. The first heat exchanger, the second heat exchanger, the exhaust port of the compressor, and the return port of the compressor are all connected to the reversing assembly. The first heat exchanger is heat-exchangingly connected to the energy storage device.

[0031] The compressor, the throttling component, and the commutation assembly are all connected to the control device, which includes a memory, a processor, and a control program for the heat pump system stored in the memory and executable on the processor. When the control program for the heat pump system is executed by the processor, it implements the steps of the control method for the heat pump system as described in any of the preceding claims.

[0032] In addition, to achieve the above objectives, this application also proposes a storage medium storing a control program for a heat pump system, which, when executed by a processor, implements the steps of the control method for the heat pump system as described in any of the preceding claims.

[0033] This invention proposes a control method for a heat pump system. The heat pump system includes an energy storage device connected to a heat exchanger. When the heat pump system needs to start in heating mode, the reversing assembly first operates in the cooling valve position during the compressor startup phase. At this time, the first heat exchanger is in an evaporating state and can absorb sufficient heat from the energy storage device, which helps the compressor quickly reach a hot state. Once the compressor reaches preset operating conditions, the reversing assembly is switched to the heating valve position to enter heating mode. This effectively avoids the situation where the ambient temperature of the second heat exchanger is too low, preventing the system from absorbing sufficient heat from the environment if it starts in heating mode directly in the heating valve position. This helps to quickly increase the compressor exhaust temperature and the system low-pressure, allowing the heat pump system to quickly reach a stable operating state during heating startup, thus effectively protecting the compressor. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the system structure of an embodiment of the heat pump system of the present invention;

[0035] Figure 2 This is a schematic diagram of the hardware structure involved in the operation of an embodiment of the heat pump system of the present invention;

[0036] Figure 3 This is a flowchart illustrating an embodiment of the control method for the heat pump system of the present invention;

[0037] Figure 4 This is a schematic flowchart of another embodiment of the control method for the heat pump system of the present invention;

[0038] Figure 5 This is a flowchart illustrating another embodiment of the control method for the heat pump system of the present invention.

[0039] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0040] It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0041] This invention provides a heat pump system.

[0042] In this embodiment of the invention, reference is made to Figure 1 and Figure 2The heat pump system includes a control device 100, a compressor 1, a commutation assembly 6, a first heat exchanger 2, a throttling device 3, a second heat exchanger 4, and an energy storage device 5. The first heat exchanger 2, the throttling device 3, and the second heat exchanger 4 are connected in sequence. The first heat exchanger 2 is connected to the energy storage device 5 for heat exchange. The exhaust port of the compressor 1, the return port of the compressor 1, the first heat exchanger 2, and the second heat exchanger 4 are all connected to the commutation assembly 6. The compressor 1, the commutation assembly 6, and the throttling device 3 are all connected to the control device 100.

[0043] In this embodiment, compressor 1 is a fixed-frequency compressor. The refrigerant charged in the heat pump system is R290 refrigerant.

[0044] The energy storage device 5 contains an energy storage medium. When the refrigerant flows through the first heat exchanger 2, it can exchange heat with the energy storage medium, which can store the cold or heat absorbed from the refrigerant. In this embodiment, the energy storage device 5 is an insulated water tank, which consists of an inner liner, an insulation layer, and an outer shell from the inside out. The first heat exchanger 2 is located between the inner liner and the insulation layer. The first heat exchanger 2 is a microchannel heat exchanger (i.e., a parallel flow heat exchanger) and is tightly wrapped around the outer wall of the inner liner.

[0045] In this embodiment, the throttling component 3 is an electronic expansion valve with an opening adjustment range of 0-500P (pulse). In other embodiments, the electronic expansion valve may also be other throttling components 3 with adjustable opening.

[0046] The reversing assembly 6 may include a four-way valve, etc.

[0047] When the commutator 6 is running in the first state, the refrigerant flow direction is as follows: Figure 1 As shown by the solid line, the exhaust port of compressor 1, the first heat exchanger 2, the throttling component 3, the second heat exchanger 4, and the return port of compressor 1 are connected in sequence. When compressor 1 is turned on, the refrigerant discharged by compressor 1 flows through the first heat exchanger 2 for heat exchange, the throttling component 3 for throttling, and the second heat exchanger 4 for heat exchange before flowing back to compressor 1. Compressor 1 is in heating mode, the first heat exchanger 2 is in condensation state, and the second heat exchanger 4 is in evaporation state. When the refrigerant flows through the first heat exchanger 2, the heat is stored in the energy storage device 5.

[0048] When the commutator 6 is running in the second state, the refrigerant flow direction is as follows: Figure 1 As shown by the dashed line, the exhaust port of compressor 1, the second heat exchanger 4, the throttling component 3, the first heat exchanger 2, and the return port of compressor 1 are connected in sequence. When compressor 1 is turned on, the refrigerant discharged by compressor 1 flows through the second heat exchanger 4 for heat exchange, the throttling component 3 for throttling, and the first heat exchanger 2 for heat exchange before flowing back to compressor 1. Compressor 1 is in cooling mode, the first heat exchanger 2 is in evaporation state, and the second heat exchanger 4 is in condensation state. When the refrigerant flows through the first heat exchanger 2, the cooling capacity is stored in the energy storage device 5.

[0049] Furthermore, refer to Figure 1 and Figure 2 The heat pump system also includes an exhaust temperature sensor 01 connected to the control device 100, which is located on the exhaust pipe of the compressor 1 to detect the exhaust temperature of the compressor 1.

[0050] Furthermore, refer to Figure 1 and Figure 2 The heat pump system also includes an energy storage temperature sensor 02 connected to the control device 100, which is located inside the energy storage device 5 (e.g., the outer wall of the inner tank of the water tank mentioned above) to detect the energy storage temperature of the energy storage device 5.

[0051] Furthermore, refer to Figure 1 and Figure 2 The heat pump system also includes a heat exchanger temperature sensor 03 connected to the control device 100, which is located on the second heat exchanger 4 to detect the coil temperature of the second heat exchanger.

[0052] Furthermore, refer to Figure 1 and Figure 2 The heat pump system also includes an ambient temperature sensor 04 connected to the control device 100, which is located on the fins on the windward side of the first heat exchanger 2 and / or the second heat exchanger 4 to detect the ambient temperature.

[0053] In this embodiment of the invention, reference is made to Figure 2 The control device 100 of the heat pump system includes a processor 1001, such as a CPU, a memory 1002, and a timer 1003. These components communicate with each other via a communication bus. The memory 1002 can be a high-speed RAM or a stable, non-volatile memory, such as a disk drive. Optionally, the memory 1002 can also be a storage device independent of the aforementioned processor 1001.

[0054] Those skilled in the art will understand that Figure 2 The device structure shown does not constitute a limitation on the device and may include more or fewer components than shown, or combine certain components, or have different component arrangements.

[0055] like Figure 2 As shown, the memory 1002, which serves as a computer storage medium, may include a control program for a heat pump system.

[0056] exist Figure 2 In the device shown, the processor 1001 can be used to call the control program of the heat pump system stored in the memory 1002 and execute the relevant steps of the control method of the heat pump system in the following embodiments.

[0057] This invention also provides a control method for a heat pump system, applied to the aforementioned heat pump system.

[0058] Reference Figure 3 This application proposes an embodiment of a control method for a heat pump system. In this embodiment, the control method for the heat pump system includes:

[0059] Step S10: When a start command for the heating mode is received, the compressor is controlled to start, and the reversing assembly is controlled to operate in the refrigeration valve position. The first heat exchanger corresponding to the refrigeration valve position is in the evaporation state, and the second heat exchanger is in the condensation state.

[0060] The start command can be a user-input command or an automatically generated command when the heat pump system reaches certain operating conditions. Receiving a start command indicates that the heat pump system needs to enter heating mode, in which the first heat exchanger is in a condensing state and the second heat exchanger is in an evaporating state.

[0061] When a start command is received, the compressor starts, but the reversing component does not directly operate in the heating valve position corresponding to the heat exchange mode. Instead, it first switches to the heating valve position.

[0062] In this embodiment, the commutation assembly is powered on to operate in the cooling valve position.

[0063] Step S20: When the compressor reaches the preset operating conditions, the reversing assembly is controlled to operate in the heating valve position to run the heating mode. The first heat exchanger corresponding to the heating valve position is in the condensing state and the second heat exchanger is in the evaporating state.

[0064] The preset conditions here are the conditions that the operating status parameters of the heat pump system must meet when the compressor reaches a hot state. The operating status parameters include, but are not limited to, at least one of the following parameters: compressor discharge temperature, compressor return gas temperature, temperature change value inside the energy storage device, compressor electrical parameters, compressor start-up time, etc.

[0065] When the compressor reaches preset operating conditions, the reversing assembly can be controlled to switch from the cooling valve position to the heating valve position. Specifically, the reversing assembly is de-energized to switch it to the heating valve position.

[0066] This invention proposes a control method for a heat pump system. The heat pump system includes an energy storage device connected to a heat exchanger. When the heat pump system needs to start in heating mode, the reversing assembly first operates in the cooling valve position during the compressor startup phase. At this time, the first heat exchanger is in an evaporating state and can absorb sufficient heat from the energy storage device, which helps the compressor quickly reach a hot state. When the compressor reaches preset operating conditions, the reversing assembly is then switched to the heating valve position to enter heating mode. This effectively avoids the situation where the system cannot absorb sufficient heat from the environment if the ambient temperature of the second heat exchanger is too low during heating startup. This helps to quickly increase the compressor exhaust temperature and the system low-pressure, enabling the heat pump system to quickly reach a stable operating state during heating startup, thus effectively protecting the compressor.

[0067] When the compressor is a fixed-frequency compressor, there is no need to use frequency conversion to achieve a rapid and stable heating start-up. By first running in cooling mode and then entering heating mode, the compressor of the heat pump system equipped with a fixed-frequency compressor can be quickly preheated to a hot state during heating start-up, thereby effectively improving the stability of heating start-up.

[0068] Furthermore, based on the above embodiments, another embodiment of the control method for the heat pump system of this application is proposed. In this embodiment, reference is made to... Figure 4 Step S10 includes:

[0069] Step S11: When a start command for heating mode is received, the ambient temperature and / or the first exhaust temperature of the compressor and / or the first energy storage temperature in the energy storage device are obtained.

[0070] The first exhaust temperature is specifically detected by the aforementioned exhaust temperature sensor.

[0071] The ambient temperature is specifically detected by the ambient temperature sensor installed on the second heat exchanger.

[0072] The first energy storage temperature is specifically detected by the aforementioned energy storage temperature sensor.

[0073] Step S12: When the ambient temperature and / or the first exhaust temperature and / or the first energy storage temperature meet the abnormal start-up conditions of the compressor, control the compressor to start and control the reversing assembly to operate in the refrigeration valve position.

[0074] Abnormal start-up conditions indicate a risk that the compressor may experience a slow rate of discharge temperature rise and / or excessively low low pressure and / or a long time required to reach the hot state during startup.

[0075] Abnormal start-up conditions may include the target relationship that the ambient temperature and the corresponding temperature threshold need to be achieved, or the target temperature range that the ambient temperature needs to be achieved, and / or the target relationship that the first exhaust temperature and the corresponding temperature threshold need to be achieved, or the target temperature range that the ambient temperature needs to be achieved, and / or the target relationship that the first energy storage temperature and the corresponding temperature threshold need to be achieved, or the target temperature range that the ambient temperature needs to be achieved.

[0076] Abnormal start-up conditions may also include the target relationship that needs to be achieved between at least two of the following parameters: ambient temperature, first exhaust temperature, and second exhaust temperature.

[0077] In this embodiment, the first exhaust temperature indicates the magnitude of the increase required to reach a hot state when the compressor starts, the ambient temperature indicates the evaporation effect of the second heat exchanger in the environment when the system starts directly in the heating valve position, and the energy storage device indicates the condensation effect of the first heat exchanger in the energy storage device when the system starts directly in the heating valve position. Based on this, when at least one of the above parameters meets the abnormal start-up conditions, the compressor is controlled to start and the reversing valve is controlled to operate in the cooling valve position. This helps to ensure that when the system cannot quickly reach a stable state during heating start-up, it switches to the cooling valve position, thereby further realizing that the heat pump system can quickly reach a stable operating state during heating start-up.

[0078] Furthermore, in this embodiment, after the step of obtaining the ambient temperature and / or the first exhaust temperature of the compressor and / or the first energy storage temperature in the energy storage device, the method further includes: when the ambient temperature and / or the first exhaust temperature and / or the first energy storage temperature do not meet the abnormal start-up conditions of the compressor, controlling the compressor to start and controlling the reversing assembly to operate in the heating valve position. Based on this, it is beneficial to ensure that the system can quickly reach a stable state during heating startup and directly switch to the heating valve position, thereby achieving rapid stable operation of the heat pump system during heating startup while reducing unnecessary energy loss in the energy storage device.

[0079] Furthermore, in this embodiment, the abnormal startup condition includes at least one of the following conditions:

[0080] The ambient temperature is less than or equal to the preset ambient temperature;

[0081] The first exhaust temperature is less than or equal to the first energy storage temperature.

[0082] The preset ambient temperature is a pre-set critical value used to distinguish the evaporation effect of the second heat exchanger when the system starts up and runs directly in the heating valve position.

[0083] When the ambient temperature is less than or equal to the preset ambient temperature, it indicates that the evaporation effect of the second heat exchanger is poor during heating start-up, making it difficult to obtain enough heat from the environment to enable the system to quickly reach a stable state during heating start-up.

[0084] When the first exhaust temperature is less than or equal to the first energy storage temperature, it indicates that the condensation effect of the first heat exchanger is poor during heating start-up, and the exhaust temperature is difficult to rise quickly.

[0085] In this embodiment, abnormal start-up conditions are set in the manner described above, which helps to improve the accuracy of control during the heating start-up of the heat pump system.

[0086] Furthermore, based on any of the above embodiments, another embodiment of the control method for the heat pump system of this application is proposed. In this embodiment, reference is made to... Figure 5 Step S102 is defined as the step of controlling the commutation assembly to operate in the refrigeration valve position. Before step S102, the following steps are also included:

[0087] Step S101: When a start command for the heating mode is received, the compressor is started, the fan corresponding to the second heat exchanger is turned off, and / or the throttling component is operated at an opening greater than the throttling opening.

[0088] In this embodiment, the compressor is started, the fan corresponding to the second heat exchanger is shut down, and the throttling device is operated at its maximum opening.

[0089] In this embodiment, shutting off the fan corresponding to the second heat exchanger helps the reversing assembly operate in the refrigeration valve position, reducing heat loss from the second heat exchanger and ensuring that more heat is retained in the heat pump system, shortening the time required for the compressor to reach a hot state, thereby further improving heating start-up performance. The throttling component operates at a throttling opening greater than the throttling opening, which helps reduce the temperature drop of the refrigerant caused by throttling and pressure reduction. On the one hand, this reduces heat loss from the energy storage device, and on the other hand, it allows the refrigerant discharged from the compressor to circulate and absorb heat through the energy storage device, thereby preheating the compressor and further shortening the time required for the heating start-up system to reach a stable state.

[0090] In other embodiments, the fan corresponding to the second heat exchanger can be controlled to operate at a low speed while the compressor is starting. Additionally, the throttling component can also operate at a throttling opening when the fan corresponding to the second heat exchanger is turned off.

[0091] Furthermore, in this embodiment, referring to Figure 5 Before step S20, the following are also included:

[0092] Step S103: During the operation of the reversing assembly in the refrigeration valve position, the second discharge temperature of the compressor and the second energy storage temperature in the energy storage device are obtained.

[0093] The second exhaust temperature is specifically detected by the aforementioned exhaust temperature sensor.

[0094] The second energy storage temperature is specifically detected by the aforementioned energy storage temperature sensor.

[0095] Step S104: When the second energy storage temperature is greater than the second exhaust temperature and the temperature difference between the second energy storage temperature and the second exhaust temperature is less than a preset value, control the throttling component to reduce its opening.

[0096] The throttling component can reduce its opening by either a pre-set fixed adjustment value or a value determined based on the actual operating conditions of the heat pump system. For example, the opening adjustment value can be determined based on the temperature difference between the second exhaust temperature and the target exhaust temperature, the temperature difference between the second exhaust temperature and the second energy storage temperature, and the operating time of the compressor after startup. The throttling component can then be controlled to reduce its opening according to the determined opening adjustment value.

[0097] In this embodiment, when the reversing component is operating in the refrigeration valve position, the second energy storage temperature meets the above conditions, indicating that the refrigerant has a poor heat exchange effect in the first heat exchanger and a low heat absorption efficiency. At this time, the temperature of the refrigerant entering the first heat exchanger is reduced by decreasing the opening of the throttling component, so that the system can absorb more heat from the first heat exchanger, improve the heat exchange effect of the first heat exchanger, and further rapidly increase the compressor discharge temperature and system low pressure, shorten the time required for the compressor to reach the preset conditions after startup, and enable the heat pump system to quickly reach a stable operating state when starting heating.

[0098] In other embodiments, the throttling component may also maintain operation at an opening greater than the throttling opening until the compressor operation reaches a preset condition.

[0099] Furthermore, based on any of the above embodiments, after step S10, the method further includes: when the compressor operation does not reach the preset condition, obtaining the third energy storage temperature in the energy storage device; when the third energy storage temperature is less than the preset temperature, controlling the compressor to stop; when the third energy storage temperature is greater than or equal to the preset temperature, controlling the heat pump system to maintain the current state of operation.

[0100] After controlling the heat pump system to maintain its current state of operation, it can be re-evaluated whether the compressor has reached the preset operating conditions.

[0101] The third energy storage temperature is specifically detected by the aforementioned energy storage temperature sensor.

[0102] The preset temperature is a critical value used to distinguish whether the heat in the energy storage device is sufficient to raise the refrigerant temperature when the system starts heating.

[0103] If step S102 is followed by steps S103 and S104, then after step S104, if the compressor does not reach the preset condition, the third energy storage temperature in the energy storage device is obtained; if the third energy storage temperature is lower than the preset temperature, the compressor is controlled to stop; if the third energy storage temperature is greater than or equal to the preset temperature, the heat pump system is controlled to maintain the current state of operation.

[0104] In this embodiment, when the energy storage temperature is lower than the preset temperature, it can be considered that the heat in the energy storage device is insufficient to raise the temperature during the compressor start-up phase, and the compressor has not yet reached the preset conditions. This indicates that the compressor's hot start problem cannot be solved by the heat pump system's own adjustment. At this time, switching the reversing component to the heating valve position will further deteriorate the system reliability problem. Therefore, the compressor is stopped at this time to effectively avoid compressor damage and further protect the compressor.

[0105] Furthermore, in this embodiment, the initial valve position of the commutation component is the heating valve position. Before the step of controlling the compressor to stop, the method further includes: when the third energy storage temperature is lower than a preset temperature, controlling the commutation component to switch to the heating valve position. Specifically, controlling the commutation component to power down to switch to the heating valve position. In this embodiment, the commutation component is reset before the compressor stops, which helps to ensure the accuracy of the commutation component control when the system restarts.

[0106] Furthermore, based on any of the above embodiments, the preset conditions include at least one of the following conditions:

[0107] The third exhaust temperature of the compressor is greater than the fourth energy storage temperature in the energy storage device, and the temperature difference between the third exhaust temperature and the fourth energy storage temperature is greater than a preset temperature difference value.

[0108] The temperature of the second heat exchanger is higher than the preset protection temperature.

[0109] The preset temperature difference value can be a fixed value set in advance, or it can be a value determined based on the actual operating conditions of the heat pump system. For example, the preset temperature difference value can be determined based on the set temperature of the energy storage device and the ambient temperature. When the third exhaust temperature and the fourth energy storage temperature meet the above conditions, it indicates that the compressor's exhaust temperature has been raised to a high enough level to meet the heating requirements of the energy storage device after switching to the heating valve position. At this point, timely switching of the reversing assembly to the heating valve position facilitates rapid heating startup and a stable state, thereby improving the heat storage efficiency of the energy storage device.

[0110] The preset protection temperature is specifically the highest temperature allowed for the second heat exchanger to reach in order to protect the heat pump system. The temperature of the second heat exchanger is detected by the aforementioned heat exchange temperature sensor. If the temperature of the second heat exchanger is higher than the preset protection temperature, it indicates that there is a reliability risk in the system, but the heat output is high enough to meet the heating demand. In this case, timely switching of the reversing component to the heating valve position is beneficial for rapid heating start-up and reaching a stable state, thereby improving the heat storage efficiency of the energy storage device and further protecting the heat pump system.

[0111] Furthermore, embodiments of the present invention also propose a storage medium storing a control program for a heat pump system. When the control program for the heat pump system is executed by a processor, it implements the relevant steps of any embodiment of the control method for the heat pump system described above.

[0112] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or system. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or system that includes that element.

[0113] The sequence numbers of the above embodiments of the present invention are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0114] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) as described above, and includes several instructions to cause a terminal device (which may be a mobile phone, computer, server, heat pump system, or network device, etc.) to execute the methods described in the various embodiments of the present invention.

[0115] The above are merely preferred embodiments of the present invention and do not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A control method for a heat pump system, characterized in that, The heat pump system includes a compressor, a reversing assembly, a first heat exchanger, a throttling device, a second heat exchanger, and an energy storage device. The first heat exchanger, the throttling device, and the second heat exchanger are connected in sequence. The first heat exchanger, the second heat exchanger, the exhaust port of the compressor, and the return port of the compressor are all connected to the reversing assembly. The first heat exchanger is connected to the energy storage device for heat exchange. The control method of the heat pump system includes the following steps: When a start command for heating mode is received, the compressor is controlled to start, the fan corresponding to the second heat exchanger is controlled to shut down, and / or the throttling component is controlled to operate at its maximum opening. The compressor is controlled to start, and the reversing assembly is controlled to operate in the refrigeration valve position, wherein the first heat exchanger corresponding to the refrigeration valve position is in the evaporation state and the second heat exchanger is in the condensation state. During the operation of the reversing assembly in the refrigeration valve position, the second discharge temperature of the compressor and the second energy storage temperature in the energy storage device are obtained; When the second energy storage temperature is greater than the second exhaust temperature and the temperature difference between the second energy storage temperature and the second exhaust temperature is less than the preset value, the opening adjustment value is determined based on the temperature difference between the second exhaust temperature and the target exhaust temperature, the temperature difference between the second exhaust temperature and the second energy storage temperature, and the running time after the compressor starts. The throttling component is controlled to reduce the opening according to the determined opening adjustment value. When the compressor reaches the preset operating conditions, the reversing assembly is controlled to operate in the heating valve position to run the heating mode. The first heat exchanger corresponding to the heating valve position is in the condensing state and the second heat exchanger is in the evaporating state.

2. The control method for a heat pump system as described in claim 1, characterized in that, The steps of controlling the compressor to start and controlling the reversing assembly to operate in the refrigeration valve position when a start command for the heating mode is received include: When a start command for heating mode is received, the ambient temperature and / or the first discharge temperature of the compressor and / or the first energy storage temperature in the energy storage device are obtained. When the ambient temperature and / or the first exhaust temperature and / or the first energy storage temperature meet the abnormal start-up conditions of the compressor, the compressor is controlled to start, and the reversing assembly is controlled to operate in the refrigeration valve position.

3. The control method for a heat pump system as described in claim 2, characterized in that, The abnormal start condition includes at least one of the following conditions: The ambient temperature is less than or equal to the preset ambient temperature; The first exhaust temperature is less than or equal to the first energy storage temperature.

4. The control method for a heat pump system as described in claim 2, characterized in that, Following the step of obtaining the ambient temperature and / or the first exhaust temperature of the compressor and / or the first energy storage temperature within the energy storage device, the method further includes: When the ambient temperature and / or the first exhaust temperature and / or the first energy storage temperature do not meet the abnormal start-up conditions of the compressor, the compressor is controlled to start and the reversing assembly is controlled to operate in the heating valve position.

5. The control method for a heat pump system as described in claim 1, characterized in that, After the steps of controlling the compressor to start and controlling the commutation assembly to operate in the refrigeration valve position, the method further includes: When the compressor fails to meet the preset conditions, the third energy storage temperature inside the energy storage device is obtained. When the third energy storage temperature is lower than the preset temperature, the compressor is controlled to stop. When the third energy storage temperature is greater than or equal to the preset temperature, the heat pump system is controlled to maintain the current state of operation.

6. The control method for a heat pump system as described in claim 5, characterized in that, The initial valve position of the reversing assembly is the heating valve position. Before the step of controlling the compressor to stop, the following steps are also included: When the third energy storage temperature is lower than the preset temperature, the reversing component is controlled to switch to the heating valve position.

7. The control method for a heat pump system as described in any one of claims 1 to 6, characterized in that, The preset conditions include at least one of the following conditions: The third exhaust temperature of the compressor is greater than the fourth energy storage temperature in the energy storage device, and the temperature difference between the third exhaust temperature and the fourth energy storage temperature is greater than a preset temperature difference value. The temperature of the second heat exchanger is higher than the preset protection temperature.

8. The control method for a heat pump system as described in any one of claims 1 to 6, characterized in that, The compressor is a fixed-frequency compressor.

9. A heat pump system, characterized in that, The heat pump system includes a control device, a compressor, a reversing assembly, a first heat exchanger, a throttling component, a second heat exchanger, and an energy storage device. The first heat exchanger, the throttling component, and the second heat exchanger are connected in sequence. The first heat exchanger, the second heat exchanger, the exhaust port of the compressor, and the return port of the compressor are all connected to the reversing assembly. The first heat exchanger is connected to the energy storage device for heat exchange. The compressor, the throttling component, and the commutation assembly are all connected to the control device, which includes a memory, a processor, and a control program for the heat pump system stored in the memory and executable on the processor. When the control program for the heat pump system is executed by the processor, it implements the steps of the control method for the heat pump system as described in any one of claims 1 to 8.

10. A storage medium, characterized in that, The storage medium stores a control program for a heat pump system, which, when executed by a processor, implements the steps of the control method for a heat pump system as described in any one of claims 1 to 8.

Images