Heat pump system, heat pump equipment and control method and device of heat pump equipment

Abstract

The invention belongs to the technical field of heat pumps, and particularly relates to a control method, device and equipment of heat pump equipment and a storage medium. The problem that the power consumption of heat pump equipment is high due to the fact that the rotating speed of an existing fan is not matched with the evaporation heat exchange requirement of an evaporator is solved. According to the control method of the heat pump equipment, the target rotating speed of the draught fan is comprehensively determined according to the environment parameters of the space where the heat pump equipment is located and the working parameters of the heat pump equipment, reasonable setting of the rotating speed of the draught fan is achieved, reasonable configuration of the air volume is guaranteed, the rotating speed of the draught fan of the heat pump equipment in different operation states reaches the reasonable state, and the user experience is improved. Normal operation of the heat pump equipment can be guaranteed, the operation power of the heat pump equipment can be reduced, and the energy utilization efficiency is improved. Compared with the prior art that the fan always operates at the highest rotating speed, the target rotating speed of the fan is set, so that noise can be reduced, and the use comfort of a user is improved.

Description

Technical Field

[0001] This application relates to the field of heat pump technology, and in particular to a heat pump system, heat pump equipment and its control method and apparatus. Background Technology

[0002] Heat pump technology is an energy-saving device that utilizes high-grade energy to transfer heat from a low-grade heat source to a high-grade heat source. Air-source heat pump equipment uses air as a low-grade heat source, transferring heat to a cooling medium, which then transfers the heat to the building's heating circulation system. Finally, the heat is supplied to heating terminals (floor heating, floor heating units, fan coil units, etc.) to meet the user's heating needs.

[0003] In this process, a fan is installed at the evaporator. The fan drives air to flow through the evaporator, exchanging heat with the refrigerant to cause it to evaporate and collect heat. Therefore, the fan speed is crucial for the refrigerant evaporation process. In related technologies, the fan speed is typically adjusted based on the evaporation temperature; when the evaporation temperature is low, the fan is set to a higher speed, and when the evaporation temperature is high, the fan is set to a lower speed.

[0004] However, the fan speed does not match the evaporation heat exchange requirements of the evaporator, resulting in high power consumption of the heat pump equipment. Summary of the Invention

[0005] This application provides a heat pump system, heat pump equipment, and control method and apparatus thereof to solve the technical problem in the prior art where the fan speed does not match the evaporation heat exchange demand of the evaporator, resulting in high power consumption of the heat pump equipment.

[0006] In a first aspect, embodiments of this application provide a control method for a heat pump device, the method comprising:

[0007] The environmental and operating parameters of the heat pump device are obtained; wherein, the environmental parameters of the heat pump device include the outdoor ambient temperature where the heat pump device is located, and the operating parameters of the heat pump device include the operating frequency of the compressor of the heat pump device, the operating status of the fan of the heat pump device, the evaporation temperature of the evaporator of the heat pump device, and the evaporation pressure of the heat pump device; wherein, the operating status of the fan includes the start-up state, the running state, and the shutdown state.

[0008] The target speed of the fan is determined based on the environmental and operating parameters of the heat pump equipment;

[0009] Control the fan to operate at the target speed.

[0010] In one possible implementation, determining the target speed of the fan based on the environmental and operating parameters of the heat pump equipment includes:

[0011] When the fan is in the operating state, the target rotational speed is determined based on the operating frequency of the compressor, the evaporation temperature, and the evaporation pressure.

[0012] In one possible implementation, determining the target rotational speed based on the compressor's operating frequency, the evaporation temperature, and the evaporation pressure includes:

[0013] The first rotational speed is determined based on the first rotational speed function; wherein the first rotational speed function is a function with the operating frequency of the compressor as the independent variable and the first rotational speed as the dependent variable; the first rotational speed function is a continuous function.

[0014] The target rotational speed is determined based on the first rotational speed, the evaporation temperature, and the evaporation pressure.

[0015] In one possible implementation, determining the target rotational speed based on the first rotational speed, the evaporation temperature, and the evaporation pressure includes:

[0016] The evaporation temperature correction value is determined based on the evaporation pressure;

[0017] Based on the evaporation temperature correction value and the evaporation temperature, determine the fan adjustment coefficient;

[0018] The target rotational speed is determined based on the first rotational speed and the fan adjustment coefficient.

[0019] In one possible implementation, determining the target speed of the fan based on the environmental and operating parameters of the heat pump equipment further includes:

[0020] When the fan is in the start-up state, the target speed is determined based on the outdoor ambient temperature and the preset maximum and minimum speeds of the fan.

[0021] In one possible implementation, determining the target rotational speed based on the outdoor ambient temperature and preset maximum and minimum rotational speeds of the fan includes:

[0022] The second rotational speed is determined based on the second rotational speed function; wherein the second rotational speed function is a function with the outdoor ambient temperature as the independent variable and the second rotational speed as the dependent variable; the second rotational speed function is a continuous function.

[0023] When the second rotational speed is greater than or equal to a rotational speed threshold, the target rotational speed is determined to be the maximum rotational speed; wherein, the rotational speed threshold is the maximum rotational speed minus a reference rotational speed, and the rotational speed threshold is greater than the minimum rotational speed;

[0024] When the second rotational speed is less than the rotational speed threshold but greater than the minimum rotational speed, the target rotational speed is determined to be the second rotational speed;

[0025] When the second rotational speed is less than or equal to the minimum rotational speed, the target rotational speed is determined to be the minimum rotational speed.

[0026] In one possible implementation, determining the target speed of the fan based on the environmental and operating parameters of the heat pump equipment further includes:

[0027] When the fan is in the off state, the target speed is determined to be the maximum speed of the fan.

[0028] Secondly, embodiments of this application provide a control device for a heat pump device, the control device comprising an acquisition module, a determination module, and a control module, wherein:

[0029] The acquisition module is used to acquire the environmental parameters and operating parameters of the heat pump device; wherein, the environmental parameters of the heat pump device include the outdoor ambient temperature where the heat pump device is located, and the operating parameters of the heat pump device include the operating frequency of the compressor of the heat pump device, the operating status of the fan of the heat pump device, the evaporation temperature of the evaporator of the heat pump device, and the evaporation pressure of the heat pump device; wherein, the operating status of the fan includes the start-up status, the running status, and the shutdown status.

[0030] The determining module is used to determine the target speed of the fan based on the environmental parameters and operating parameters of the heat pump equipment;

[0031] The control module is used to control the fan to operate at the target speed.

[0032] In one possible implementation, the determining module is specifically used to determine the target rotational speed based on the operating frequency of the compressor, the evaporation temperature, and the evaporation pressure when the fan is in the operating state.

[0033] In one possible implementation, the determining module is specifically used for:

[0034] The first rotational speed is determined based on the first rotational speed function; wherein the first rotational speed function is a function with the operating frequency of the compressor as the independent variable and the first rotational speed as the dependent variable; the first rotational speed function is a continuous function.

[0035] The target rotational speed is determined based on the first rotational speed, the evaporation temperature, and the evaporation pressure.

[0036] In one possible implementation, the determining module is specifically used for:

[0037] The evaporation temperature correction value is determined based on the evaporation pressure;

[0038] Based on the evaporation temperature correction value and the evaporation temperature, determine the fan adjustment coefficient;

[0039] The target rotational speed is determined based on the first rotational speed and the fan adjustment coefficient.

[0040] In one possible implementation, the determining module is specifically used for:

[0041] When the fan is in the start-up state, the target speed is determined based on the outdoor ambient temperature and the preset maximum and minimum speeds of the fan.

[0042] In one possible implementation, the determining module is specifically used for:

[0043] The second rotational speed is determined based on the second rotational speed function; wherein the second rotational speed function is a function with the outdoor ambient temperature as the independent variable and the second rotational speed as the dependent variable; the second rotational speed function is a continuous function.

[0044] When the second rotational speed is greater than or equal to a rotational speed threshold, the target rotational speed is determined to be the maximum rotational speed; wherein, the rotational speed threshold is the maximum rotational speed minus a reference rotational speed, and the rotational speed threshold is greater than the minimum rotational speed;

[0045] When the second rotational speed is less than the rotational speed threshold but greater than the minimum rotational speed, the target rotational speed is determined to be the second rotational speed;

[0046] When the second rotational speed is less than or equal to the minimum rotational speed, the target rotational speed is determined to be the minimum rotational speed.

[0047] In one possible implementation, the determining module is further configured to determine the target rotational speed as the maximum rotational speed of the fan when the fan is in the off state.

[0048] Thirdly, embodiments of this application provide a heat pump device, including: a fan, a compressor, an evaporator, and a controller, wherein the controller is used for:

[0049] The environmental and operating parameters of the heat pump device are obtained; wherein, the environmental parameters of the heat pump device include the outdoor ambient temperature where the heat pump device is located, and the operating parameters of the heat pump device include the operating frequency of the compressor of the heat pump device, the operating status of the fan of the heat pump device, the evaporation temperature of the evaporator of the heat pump device, and the evaporation pressure of the heat pump device; wherein, the operating status of the fan includes the start-up state, the running state, and the shutdown state.

[0050] The target speed of the fan is determined based on the environmental and operating parameters of the heat pump equipment;

[0051] Control the fan to operate at the target speed.

[0052] Fourthly, embodiments of this application also provide a heat pump system, which includes the heat pump device described in the third aspect.

[0053] Fifthly, embodiments of this application also provide a computer-readable storage medium storing computer-executable instructions, which, when executed by a processor, are used to implement the heat pump device control method described in the first aspect.

[0054] In a sixth aspect, embodiments of this application also provide a computer program product, including a computer program that, when executed by a processor, implements the control method for a heat pump device as described in any of the first aspects.

[0055] This application provides a heat pump system, heat pump equipment, and its control method and apparatus. The control method for the heat pump equipment in this application comprehensively determines the target speed of the fan based on the environmental parameters of the space where the heat pump equipment is located and the operating parameters of the heat pump equipment itself. This achieves a reasonable setting of the fan speed, ensuring a reasonable airflow configuration. This allows the fan speed of the heat pump equipment to reach a reasonable state under different operating conditions, ensuring the normal operation of the heat pump equipment and reducing its operating power, thus improving energy efficiency. Compared to the prior art where the fan always operates at its maximum speed, this application, by setting a target speed for the fan, can reduce noise and improve user comfort. Attached Figure Description

[0056] Figure 1 A schematic diagram of the heat pump system provided in the embodiments of this application;

[0057] Figure 2 A schematic flowchart illustrating a control method for a heat pump device provided in an embodiment of this application;

[0058] Figure 3 A schematic flowchart illustrating another control method for a heat pump device provided in an embodiment of this application;

[0059] Figure 4 A schematic diagram of another control method for a heat pump device provided in an embodiment of this application;

[0060] Figure 5 A schematic diagram of the structure of a control device for a heat pump device provided in an embodiment of this application;

[0061] Figure 6A schematic diagram of the hardware structure of the control device for the heat pump equipment provided in the embodiments of this application. Detailed Implementation

[0062] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. In the following description, when referring to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0063] 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 apparatus 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 apparatus. 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 apparatus that includes that element.

[0064] The following is combined with Figure 1 The structure of the heat pump device according to the embodiments of this application will be described.

[0065] Figure 1 A schematic diagram of the structure of a heat pump device provided in an embodiment of this application. Please refer to [link / reference]. Figure 1 The heat pump device of this application embodiment includes: a compressor 101, a four-way valve 102, an evaporator 103, a fan 104, a condenser 105, an electronic expansion valve 106, and a water pump 107; wherein, the condenser 105 has a refrigerant passage and a water passage, with refrigerant flowing in the refrigerant passage and water flowing in the water passage, and the water and refrigerant exchange heat in the condenser 105, thereby heating the water. For this purpose, the condenser 105 has four ports, namely a water inlet port, a water outlet port, a refrigerant inlet, and a refrigerant outlet.

[0066] The refrigerant passage of the condenser 105, compressor 101, four-way valve 102, evaporator 103, and electronic expansion valve 106 are connected via refrigerant piping to form a refrigerant circulation loop. The water passage of the condenser 105 is connected to the water-using equipment 108 via water pipes to form a water flow path. A water pump 107 is installed in the water flow path to provide power for water flow. Typically, the water pump 107 is installed in the inlet water flow path of the condenser 105.

[0067] When the heat pump equipment is a heat pump heating system, the water-using equipment 108 is a heating system such as radiators or underfloor heating in a building. Of course, this is not a limitation on the type of heat pump equipment; the heat pump equipment can also be a heat pump water heater, and the water-using equipment 108 can also be a water tank.

[0068] In heating mode, the heat pump unit continuously draws air through the evaporator 103 under the action of the fan 104. The refrigerant in the evaporator 103 exchanges heat with the air, absorbing heat energy and becoming a low-temperature, low-pressure gas. The compressor 101 compresses this low-temperature, low-pressure gas into a high-temperature, high-pressure gas, which is then discharged into the condenser 105 through the four-way valve 102. The refrigerant in the condenser 105's refrigerant passage exchanges heat with the water in its water passage, transferring heat to the water. The heated water then flows through a water pipe to the water outlet. The medium-temperature, high-pressure liquid that loses heat in the condenser 105 becomes a low-temperature, low-pressure gas-liquid mixture under the action of the electronic expansion valve 106, and flows back into the evaporator 103.

[0069] In defrost mode, or in some heat pump devices with a cooling mode, the refrigerant flow direction is opposite to that in heating mode, which will not be elaborated further here.

[0070] When the heat pump equipment is in heating mode, a high-pressure circuit is formed between the exhaust port of the compressor 101, the four-way valve 102, the condenser 105, and the electronic expansion valve 106 in the refrigerant circulation loop. A pressure detection device is installed in the high-pressure circuit to determine the high-pressure of the heat pump equipment, i.e., the condensing pressure. A low-pressure circuit is formed between the electronic expansion valve 106, the evaporator 103, the four-way valve 102, and the suction port of the compressor 101. A pressure detection device is installed in the low-pressure circuit to determine the low-pressure of the heat pump equipment, i.e., the evaporating pressure.

[0071] The technical solutions shown in this application will now be described in detail through specific embodiments. It should be noted that the following embodiments may exist independently or in combination with each other; identical or similar content will not be repeated in different embodiments.

[0072] Figure 2 This is a schematic flowchart illustrating a control method for a heat pump device provided in an embodiment of this application. Please refer to... Figure 2 The method may include:

[0073] S201. Obtain the environmental parameters and operating parameters of the heat pump equipment.

[0074] The environmental parameters of the heat pump equipment include the outdoor ambient temperature where the heat pump equipment is located; the operating parameters of the heat pump equipment include: the operating frequency of the compressor of the heat pump equipment, the operating status of the fan of the heat pump equipment, the evaporation temperature of the evaporator of the heat pump equipment, and the evaporation pressure of the heat pump equipment.

[0075] The execution entity in this application embodiment can be a heat pump device or a control device installed in the heat pump device. Optionally, the control device of the heat pump device can be implemented by software or by a combination of software and hardware.

[0076] The working states of the fan include a start-up state, a running state, and a shutdown state. The fan is in the start-up state for a first period of time after receiving a start signal; the fan is in the shutdown state for a second period of time after receiving a shutdown signal; and the working state of the fan between the start-up state and the shutdown state is the running state.

[0077] For example, the first duration is 2 minutes; the second duration is 2 minutes. Within 2 minutes of receiving the start signal, the fan is in the start-up state; after receiving the shutdown signal, the fan runs for another 2 minutes, during which it is in the shutdown state. During the other durations of fan operation, the fan is in the running state.

[0078] After the fan receives a start signal, a timer inside the heat pump unit starts working; the timer records the fan's on-time duration; when the fan's on-time duration is less than or equal to a first duration, the fan is in the start-up state; when the fan's on-time duration is greater than the first duration, the fan is in the running state. Optionally, the timer stops working when the fan is in the running state. When the fan receives a shutdown signal, the timer restarts and records the fan's shutdown duration; when the shutdown duration is less than or equal to a second duration, the fan is in the shutdown state; when the fan's shutdown duration is greater than the second duration, the fan is turned off.

[0079] One approach is to install a temperature sensor on the heat pump device to obtain the outdoor ambient temperature Ta where the heat pump device is located; alternatively, the heat pump device can be connected to a wireless network to obtain the outdoor ambient temperature Ta where the heat pump device is located through local weather forecasts.

[0080] In this embodiment, the operating frequency of the compressor can be determined based on the compressor's operating parameters or a pre-set operating frequency determination function.

[0081] The evaporation temperature Te can be obtained by installing a temperature sensor on the evaporator of the heat pump equipment.

[0082] The evaporation pressure Pe can be obtained by installing a pressure detection device on the low-pressure circuit of the refrigerant. The pressure detection device can be installed at any location on the low-pressure circuit; for example, it can be installed at the outlet of the evaporator to determine the evaporation pressure Pe.

[0083] S202: Determine the target speed of the fan based on the environmental and operating parameters of the heat pump equipment.

[0084] Among them, the outdoor ambient temperature affects the heat of evaporation. A higher outdoor ambient temperature indicates that there is more heat in the air, which allows more refrigerant to evaporate into gas within the same amount of time.

[0085] The operating frequency of a compressor can characterize the compressor displacement per unit time, thereby enabling load regulation of heat pump equipment. The operating frequency of the compressor is related to the high pressure, low pressure, heating capacity, and evaporation temperature in the refrigerant circulation loop.

[0086] By setting different wind speed determination methods under different operating conditions, the fan can not only ensure the wind speed required for evaporation, but also ensure low power consumption and reduce fan operating noise.

[0087] The evaporation temperature and evaporation pressure of a heat pump will both affect the fan speed. For example, when the evaporation temperature is low, it means that the heat required for evaporation is insufficient. In this case, a higher fan speed needs to be set to increase airflow near the evaporator and ensure the heat required for evaporation.

[0088] Taking all the above factors into account, determining the target speed of the fan based on external environmental parameters and the operating parameters of the heat pump equipment itself can improve the operating efficiency of the heat pump equipment while meeting its heating capacity requirements.

[0089] S203: Control the fan to operate at the target speed.

[0090] For example, the fan can be controlled to operate at a target speed by controlling its power. Specifically, the fan can be controlled to operate at a target speed by controlling its operating voltage and / or current.

[0091] The control method for the heat pump device in this application determines the target speed of the fan based on the environmental and operating parameters of the heat pump device, thereby achieving a reasonable setting of the fan speed and ensuring a reasonable airflow configuration. This allows the fan speed of the heat pump device to reach a reasonable state under different operating conditions, ensuring the normal operation of the heat pump device and reducing its operating power, thus improving energy efficiency. Compared to the prior art where the fan always operates at the highest speed, this application embodiment reduces noise and improves user comfort by setting the target speed of the fan.

[0092] exist Figure 2 Based on the embodiments shown, the following is combined with Figure 3 The control methods for the aforementioned heat pump equipment are explained in detail.

[0093] Figure 3This is a schematic diagram of another control method for a heat pump device provided in an embodiment of this application. Please refer to... Figure 3 The method includes:

[0094] S301. Obtain the environmental parameters and operating parameters of the heat pump equipment.

[0095] It should be noted that the execution process of step S301 can refer to the execution process of S201, and will not be repeated here.

[0096] After obtaining the operating status of the fan, different target speed determination methods are determined according to different operating statuses.

[0097] S302: When the fan is in the start-up state, the target speed is determined based on the outdoor ambient temperature and the preset maximum and minimum speeds of the fan.

[0098] When the outdoor ambient temperature is low, the heat exchange is small, requiring a larger airflow to meet the refrigerant evaporation demand; when the outdoor ambient temperature is high, the heat exchange is large, allowing for a smaller airflow setting. This satisfies the refrigerant evaporation demand while reducing fan speed, thereby reducing power consumption and noise.

[0099] To ensure the safety and lifespan of the fan, it is typically configured with a maximum and a minimum speed. The target speed of the fan is greater than or equal to the minimum speed and less than or equal to the maximum speed. For example, the fan speed range is 0–800 r / min, the minimum speed is 450 r / min, and the maximum speed is 800 r / min.

[0100] When the fan is in the start-up state, the target speed is determined by taking into account the outdoor ambient temperature, as well as the fan's maximum and minimum speeds. This ensures that the evaporation demand is met and that the fan's target speed is within the set range, thus guaranteeing the safety of the fan's operation.

[0101] In some embodiments, determining the target rotational speed based on the outdoor ambient temperature, a preset mapping relationship between outdoor ambient temperature and rotational speed, and preset maximum and minimum rotational speeds of the fan includes:

[0102] Step 1: Determine the second rotational speed according to the second rotational speed function; wherein the second rotational speed function is a function with the outdoor ambient temperature as the independent variable and the second rotational speed as the dependent variable; the second rotational speed function is a continuous function.

[0103] The second rotational speed function can be a linear function, or it can be other continuous functions. In this embodiment, the second rotational speed is determined by the second rotational speed function, allowing the target rotational speed of the fan to change continuously and steplessly. This enables the target rotational speed of the fan to adapt to changes in the outdoor ambient temperature, satisfying evaporation requirements while reducing noise.

[0104] The second rotational speed function can be the sum of a weighted average of the outdoor ambient temperature and an initial wind speed constant; where the weighted average of the outdoor ambient temperature is the product of the outdoor ambient temperature and the initial wind speed slope constant. The initial wind speed slope constant is a pre-set constant characterizing the relationship between the fan speed and the outdoor ambient temperature.

[0105] Specifically, the second rotational speed function is Rn = Kn * Ta + Bn, where Rn is the second rotational speed of the fan, Kn is the initial wind speed slope constant, Ta is the obtained outdoor ambient temperature, and Bn is the initial wind speed constant.

[0106] Step 2: When the second rotational speed is greater than or equal to a rotational speed threshold, determine the target rotational speed as the maximum rotational speed. The rotational speed threshold is the maximum rotational speed minus a reference rotational speed, and the rotational speed threshold is greater than the minimum rotational speed. For example, if the reference rotational speed is 50 r / min, and the maximum rotational speed is 800 r / min, the rotational speed threshold is 750 r / min. This step can be understood as follows: when the second rotational speed is relatively high, it indicates that the outdoor ambient temperature is relatively low, requiring a higher wind speed to meet the evaporator's evaporation needs; directly determining the target rotational speed as the maximum rotational speed at this time ensures sufficient wind speed, preventing frost buildup on the evaporator and thus affecting the system performance of the heat pump equipment.

[0107] Step 3: When the second rotational speed is less than the rotational speed threshold but greater than the minimum rotational speed, the target rotational speed is determined to be the second rotational speed. This step can be understood as follows: at this time, the second rotational speed is between the rotational speed threshold and the minimum rotational speed, the outdoor ambient temperature is relatively high, and the target rotational speed is the second rotational speed, that is, the target rotational speed is Kn*Ta+Bn, the target rotational speed is a linear function of the outdoor ambient temperature Ta, and the fan speed is in a stepless adjustment state. This ensures that the fan speed meets the evaporation requirements of the evaporator. Compared with the prior art where the fan operates at the highest speed, the embodiment of this application can also effectively reduce the noise caused by the fan speed.

[0108] Step 4: When the second rotational speed is less than or equal to the minimum rotational speed, determine the target rotational speed as the minimum rotational speed. This step can be understood as follows: when the second rotational speed is low, it indicates that the outdoor ambient temperature is high, the evaporation temperature is high, and a lower wind speed can meet the evaporation requirements. Adjusting the target rotational speed to the minimum speed at this time protects the fan and ensures the normal operation of the heat pump equipment, preventing high-pressure alarms and other malfunctions.

[0109] Therefore, in the heat pump equipment of this application embodiment, when the fan is in the start-up phase, the second speed is determined by the outdoor ambient temperature and the preset mapping relationship between the outdoor ambient temperature and the speed; then, the target speed is further determined according to the relationship between the second speed and the highest and lowest speeds of the fan. This setting can ensure that the fan speed is adjusted according to the outdoor ambient temperature to meet the evaporation requirements of the evaporator; it can also ensure that the fan operates within the highest and lowest speed range, ensuring the safety of the fan operation.

[0110] S303. When the fan is in the operating state, the target speed is determined according to the operating frequency of the compressor, the evaporation temperature, and the evaporation pressure.

[0111] After the fan has been running for a period of time, i.e. when the fan enters the operating state, the compressor's operating frequency, evaporation temperature, and other factors will affect the fan speed.

[0112] The compressor's operating frequency is positively correlated with the fan's target speed. A higher compressor operating frequency results in a larger refrigerant circulation volume, requiring more heat for evaporation and thus a larger airflow. The outdoor ambient temperature affects the compressor's operating frequency in segments: in extremely low temperatures, due to the small specific volume of air and low heat exchange, a larger airflow is needed to meet the refrigerant evaporation demand; at this time, the compressor's operating frequency is lower, but a higher fan speed is still required. In low temperatures, both the outdoor ambient temperature and the compressor's operating frequency affect the fan's airflow. Especially during the stable operation phase of the heat pump equipment, the compressor operates in the middle frequency range, and a suitable fan speed reduces noise and improves the heat pump's energy efficiency. However, during heat pump operation, insufficient airflow to the evaporator leads to a decrease in evaporation pressure and a rapid drop in evaporation temperature, making the evaporator prone to frosting.

[0113] Therefore, when the fan is running, the target speed of the fan is determined by combining the compressor's operating frequency, evaporation temperature, and evaporation pressure to achieve a reasonable distribution of air volume. This not only meets the evaporator's evaporation requirements and ensures stable operation of the heat pump equipment, but also helps to reduce the fan speed compared to the existing technology that always operates at high speed. This reduces the noise caused by the fan rotation, lowers the power consumption of the heat pump equipment, and improves energy efficiency.

[0114] When the fan is first started, the outdoor ambient temperature Ta has a direct impact on the evaporation rate of the evaporator. Therefore, the target speed of the fan is set according to the outdoor ambient temperature Ta during startup.

[0115] S304: When the fan is in the off state, the target speed is determined to be the maximum speed of the fan.

[0116] This step can be understood as follows: after the fan receives the shutdown signal, the target speed of the fan is adjusted to the maximum speed so that all the refrigerant in the evaporator evaporates, thus preventing liquid slugging in the compressor when restarting and preventing refrigerant migration caused by refrigerant evaporation when the heat pump is shut down, which would affect the restart of the heat pump.

[0117] S305: Control the fan to operate at the target speed.

[0118] It should be noted that the execution process of step S305 can refer to the execution process of S203, and will not be repeated here.

[0119] In this embodiment, when the fan is in the start-up state, the target speed is determined based on the outdoor ambient temperature and the fan's preset maximum and minimum speeds. This allows for dynamic adjustment of the target speed according to the outdoor ambient temperature, ensuring that the fan's target speed matches the evaporative heat exchange requirements of the evaporator. It also ensures that the fan's target speed is between the minimum and maximum speeds, thereby guaranteeing the fan's operational safety. When the fan is in operation, the target speed is comprehensively determined based on the compressor's operating frequency, evaporation pressure, and evaporation temperature, achieving a reasonable distribution of airflow. This satisfies the evaporator's evaporation requirements, matching the fan's target speed with the evaporative heat exchange needs, thus ensuring the normal operation of the heat pump equipment. Compared to the prior art where the fan always operates at the maximum speed, this reduces noise caused by fan rotation, lowers the heat pump equipment's power consumption, and improves its operating efficiency. When the fan is in the off state, setting the target speed to the maximum speed allows for rapid evaporation of the refrigerant in the evaporator, preventing liquid slugging in the compressor upon restart and improving the operational safety of the heat pump equipment.

[0120] Figure 4 This is a schematic diagram of another control method for a heat pump device provided in an embodiment of this application.

[0121] Combination Figure 4 The control method for the heat pump equipment provided in this application embodiment specifically includes:

[0122] S401: Determine the first rotational speed based on the first rotational speed function.

[0123] Wherein, the first speed function is a function with the operating frequency of the compressor as the independent variable and the first speed as the dependent variable; the first speed function is a continuous function.

[0124] In some embodiments, the first rotational speed function can be a linear function. This application embodiment determines the first rotational speed through the first rotational speed function, enabling the fan in operation to continuously adjust its speed steplessly. This ensures a reasonable fan speed under different operating conditions of the heat pump equipment, satisfying the normal operation of the heat pump equipment while effectively reducing its operating power and improving energy efficiency; simultaneously, it reduces noise from the fan rotation.

[0125] In some specific embodiments, the first speed function Rn = (Kr * ft * K(Ta) + Bn) * Km; where Kr is the wind speed slope constant of the fan, which is preset and characterizes the influence of the compressor's operating frequency and the outdoor ambient temperature on the fan speed under the fan's operating state; ft is the compressor's operating frequency; K(Ta) is the ambient temperature influence constant; Bn is the fan's initial wind speed constant; and Km is the margin coefficient, with a value ranging from 0 to 3, to increase or decrease the fan's target speed overall.

[0126] K(Ta) can be determined using the following table 1. Table 1

[0127] Of course, Table 1 above is not a limitation on how K(Ta) is determined. K(Ta) can also be other piecewise functions or continuous functions, where the independent variable is the outdoor ambient temperature Ta and the dependent variable is K(Ta).

[0128] If the fan speed is too low and the air volume is insufficient during the operation of a heat pump, the evaporation pressure in the refrigerant circuit will decrease and the evaporation temperature will decrease, causing the evaporator to frost quickly. Therefore, in this embodiment, the evaporation temperature and evaporation pressure are used to correct the fan speed.

[0129] S402: Determine the evaporation temperature correction value based on the evaporation pressure.

[0130] This step can be understood as determining the evaporation temperature correction value corresponding to the evaporation pressure based on the detected evaporation pressure and the physical properties of the refrigerant itself. This evaporation temperature correction value differs from the detected evaporation temperature.

[0131] S403: Determine the fan adjustment coefficient based on the evaporation temperature correction value and the evaporation temperature.

[0132] In this embodiment of the application, an adjustment coefficient is determined based on the evaporation temperature correction value obtained by converting the evaporation pressure and the detected evaporation temperature, thereby adjusting the target speed of the fan.

[0133] In some specific embodiments, when Te1 > Te + ΔT, the evaporation temperature correction value is greater than the evaporation temperature, indicating that the actual evaporation temperature of the heat pump equipment is greater than the detected evaporation temperature, and there is excess heat required for evaporation. Therefore, the target speed of the fan can be reduced. The fan adjustment coefficient can be determined as a first coefficient, where the first coefficient is less than 1, for example, 0.95. Here, Te1 is the evaporation temperature correction value, Te is the evaporation temperature, and ΔT is the temperature threshold, for example, ΔT can be 2℃.

[0134] When Te+ΔT≥Te1>Te-ΔT, the difference between the evaporation temperature correction value and the evaporation temperature is not large, indicating that the actual evaporation temperature of the heat pump equipment is not significantly different from the detected evaporation temperature. In this case, the target fan speed can be maintained. The fan adjustment coefficient can be determined as the second coefficient, where the second coefficient is 1.

[0135] When Te1 ≤ Te - ΔT, the evaporation temperature correction value is less than the evaporation temperature, ensuring that the actual evaporation temperature of the heat pump equipment is lower than the detected evaporation temperature. This results in insufficient heat for evaporation, increasing the risk of frost formation on the evaporator. To avoid evaporator frost formation, the target fan speed needs to be increased. The fan adjustment coefficient can be determined as the second coefficient, which is greater than 1; for example, the second coefficient is 1.05.

[0136] S404: Determine the target rotational speed based on the first rotational speed and the fan adjustment coefficient.

[0137] In some embodiments, the target speed is determined as the product of a first speed and a fan adjustment coefficient, which allows for simple and convenient adjustment of the target speed.

[0138] Thus, when Te1 > Te + ΔT, the target speed Rn = (Kr * ft * K(Ta) + Bn) * Km * 0.95; when Te + ΔT ≥ Te1 > Te - ΔT, the target speed Rn = (Kr * ft * K(Ta) + Bn) * Km; when Te1 ≤ Te - ΔT, the target speed Rn = (Kr * ft * K(Ta) + Bn) * Km * 1.05.

[0139] Optionally, during operation, the adjustment cycle of the target speed of the fan can be 2 minutes. Specifically, the evaporation pressure and evaporation temperature are collected every 2 minutes, and the first speed is corrected using the evaporation pressure and evaporation temperature to determine the target speed of the fan.

[0140] In this embodiment, a first rotational speed is determined based on a first rotational speed function. This first rotational speed function is a continuous function, ensuring that the target rotational speed during operation is continuously and steplessly variable. This allows for dynamic adjustment of the target rotational speed according to the compressor's operating frequency, guaranteeing evaporation requirements and ensuring the normal operation of the heat pump equipment. It also avoids setting excessively high or low fan speeds, which could negatively impact the heat pump's operating efficiency. Furthermore, the first rotational speed is corrected using evaporation temperature and evaporation pressure to determine the target rotational speed. This ensures that the target rotational speed is adjusted according to the actual needs of the evaporator, guaranteeing the rationality and accuracy of the fan target rotational speed adjustment.

[0141] The control method for the heat pump equipment in this application embodiment controls the compressor, fan, and electronic expansion valve based on the outdoor ambient temperature, indoor ambient temperature, set temperature, outlet water temperature, start-up time, evaporation temperature, and suction temperature to ensure the normal and efficient operation of the heat pump equipment.

[0142] Figure 5 This is a schematic diagram of a control device for a heat pump device provided in an embodiment of this application. The control device 500 can be installed within the heat pump device. Please refer to... Figure 5 The control device 500 of the heat pump equipment may include an acquisition module 501, a determination module 502, and a control module 503, wherein:

[0143] The acquisition module 501 is used to acquire the environmental parameters and operating parameters of the heat pump device; wherein, the environmental parameters of the heat pump device include the outdoor ambient temperature where the heat pump device is located, and the operating parameters of the heat pump device include the operating frequency of the compressor of the heat pump device, the operating status of the fan of the heat pump device, the evaporation temperature of the evaporator of the heat pump device, and the evaporation pressure of the heat pump device; wherein, the operating status of the fan includes the start-up state, the running state, and the shutdown state.

[0144] The determining module 502 is used to determine the target speed of the fan based on the environmental parameters and operating parameters of the heat pump equipment;

[0145] The control module 503 is used to control the fan to run at the target speed.

[0146] In one possible implementation, the determining module 502 is specifically used to determine the target rotational speed based on the operating frequency of the compressor, the evaporation temperature, and the evaporation pressure when the fan is in the operating state.

[0147] In one possible implementation, the determining module 502 is specifically used for:

[0148] The first rotational speed is determined based on the first rotational speed function; wherein the first rotational speed function is a function with the operating frequency of the compressor as the independent variable and the first rotational speed as the dependent variable; the first rotational speed function is a continuous function.

[0149] The target rotational speed is determined based on the first rotational speed, the evaporation temperature, and the evaporation pressure.

[0150] In one possible implementation, the determining module 502 is specifically used for:

[0151] The evaporation temperature correction value is determined based on the evaporation pressure;

[0152] Based on the evaporation temperature correction value and the evaporation temperature, determine the fan adjustment coefficient;

[0153] The target rotational speed is determined based on the first rotational speed and the fan adjustment coefficient.

[0154] In one possible implementation, the determining module 502 is specifically used for:

[0155] When the fan is in the start-up state, the target speed is determined based on the outdoor ambient temperature and the preset maximum and minimum speeds of the fan.

[0156] In one possible implementation, the determining module 502 is specifically used for:

[0157] The second rotational speed is determined based on the second rotational speed function; wherein the second rotational speed function is a function with the outdoor ambient temperature as the independent variable and the second rotational speed as the dependent variable; the second rotational speed function is a continuous function.

[0158] When the second rotational speed is greater than or equal to a rotational speed threshold, the target rotational speed is determined to be the maximum rotational speed; wherein, the rotational speed threshold is the maximum rotational speed minus a reference rotational speed, and the rotational speed threshold is greater than the minimum rotational speed;

[0159] When the second rotational speed is less than the rotational speed threshold but greater than the minimum rotational speed, the target rotational speed is determined to be the second rotational speed;

[0160] When the second rotational speed is less than or equal to the minimum rotational speed, the target rotational speed is determined to be the minimum rotational speed.

[0161] In one possible implementation, the determining module 502 is further configured to determine the target rotational speed as the maximum rotational speed of the fan when the fan is in the off state.

[0162] The control device for a heat pump device provided in this application embodiment can execute the technical solution shown in the above method embodiment. Its principle and beneficial effects are similar, and will not be described again here.

[0163] Figure 6 This is a schematic diagram of the hardware structure of the control device for the heat pump equipment provided in this embodiment of the application. Please refer to... Figure 6 The control device 600 of the heat pump device may include a processor 601 and a memory 602, wherein the processor 601 and the memory 602 can communicate; for example, the processor 601 and the memory 602 communicate via a communication bus 603, the memory 602 is used to store a computer program, and the processor 601 is used to call the computer program in the memory 602 to execute the control method of the heat pump device shown in any of the above method embodiments.

[0164] Optionally, the control device 600 of the heat pump equipment may also include a communication interface, which may include a transmitter and / or a receiver.

[0165] Optionally, the aforementioned processor can be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), etc. The general-purpose processor can be a microprocessor or any conventional processor. The steps of the method disclosed in the embodiments of this application can be directly implemented by a hardware processor, or implemented by a combination of hardware and software modules within the processor.

[0166] This application provides a heat pump device, including as follows: Figure 6 The control equipment for the heat pump shown.

[0167] This application provides a heat pump device, including: a fan, a compressor, an evaporator, and a controller, wherein the controller is used for:

[0168] The environmental and operating parameters of the heat pump device are obtained; wherein, the environmental parameters of the heat pump device include the outdoor ambient temperature where the heat pump device is located, and the operating parameters of the heat pump device include the operating frequency of the compressor of the heat pump device, the operating status of the fan of the heat pump device, the evaporation temperature of the evaporator of the heat pump device, and the evaporation pressure of the heat pump device; wherein, the operating status of the fan includes the start-up state, the running state, and the shutdown state.

[0169] The target speed of the fan is determined based on the environmental and operating parameters of the heat pump equipment;

[0170] Control the fan to operate at the target speed.

[0171] The present application also provides a heat pump system, which includes the heat pump device described above.

[0172] This application provides a computer-readable storage medium storing computer-executable instructions; when executed by a processor, the computer-executable instructions are used to implement the control method of the heat pump device as described in any of the above embodiments.

[0173] This application provides a computer program product, which includes a computer program that, when executed by a processor, implements the control method for a heat pump device as described in any of the above embodiments.

[0174] In the several embodiments provided in this application, it should be understood that the disclosed apparatus and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between apparatuses or units may be electrical, mechanical, or other forms.

[0175] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0176] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or in the form of hardware plus software functional units.

[0177] The integrated units implemented as software functional units described above can be stored in a computer-readable storage medium. These software functional units, stored in a storage medium, include several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) or processor to execute some steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0178] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional modules is merely an example. In practical applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above. The specific working process of the device described above can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0179] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A control method for a heat pump device, characterized in that, include The environmental and operating parameters of the heat pump device are obtained; wherein, the environmental parameters of the heat pump device include the outdoor ambient temperature where the heat pump device is located, and the operating parameters of the heat pump device include the operating frequency of the compressor of the heat pump device, the operating status of the fan of the heat pump device, the evaporation temperature of the evaporator of the heat pump device, and the evaporation pressure of the heat pump device; wherein, the operating status of the fan includes the start-up state, the running state, and the shutdown state. The target speed of the fan is determined based on the environmental and operating parameters of the heat pump equipment; Control the fan to operate at the target speed.

2. The method according to claim 1, characterized in that, Determining the target speed of the fan based on the environmental and operating parameters of the heat pump equipment includes: When the fan is in the operating state, the target rotational speed is determined based on the operating frequency of the compressor, the evaporation temperature, and the evaporation pressure.

3. The method according to claim 2, characterized in that, Determining the target rotational speed based on the compressor's operating frequency, the evaporation temperature, and the evaporation pressure includes: The first rotational speed is determined based on the first rotational speed function; wherein the first rotational speed function is a function with the operating frequency of the compressor as the independent variable and the first rotational speed as the dependent variable; the first rotational speed function is a continuous function. The target rotational speed is determined based on the first rotational speed, the evaporation temperature, and the evaporation pressure.

4. The method according to claim 3, characterized in that, Determining the target rotation speed based on the first rotation speed, the evaporation temperature, and the evaporation pressure includes: Determine the evaporation temperature correction value based on the evaporation pressure; Based on the evaporation temperature correction value and the evaporation temperature, determine the fan adjustment coefficient; The target rotational speed is determined based on the first rotational speed and the fan adjustment coefficient.

5. The method according to any one of claims 1-4, characterized in that, The step of determining the target speed of the fan based on the environmental and operating parameters of the heat pump equipment further includes: When the fan is in the start-up state, the target speed is determined based on the outdoor ambient temperature and the preset maximum and minimum speeds of the fan.

6. The method according to claim 5, characterized in that, Determining the target rotational speed based on the outdoor ambient temperature and the preset maximum and minimum rotational speeds of the fan includes: The second rotational speed is determined based on the second rotational speed function; wherein the second rotational speed function is a function with the outdoor ambient temperature as the independent variable and the second rotational speed as the dependent variable; the second rotational speed function is a continuous function. When the second rotational speed is greater than or equal to a rotational speed threshold, the target rotational speed is determined to be the maximum rotational speed; wherein, the rotational speed threshold is the maximum rotational speed minus a reference rotational speed, and the rotational speed threshold is greater than the minimum rotational speed; When the second rotational speed is less than the rotational speed threshold but greater than the minimum rotational speed, the target rotational speed is determined to be the second rotational speed; When the second rotational speed is less than or equal to the minimum rotational speed, the target rotational speed is determined to be the minimum rotational speed.

7. The method according to any one of claims 1-4, characterized in that, The step of determining the target speed of the fan based on the environmental and operating parameters of the heat pump equipment further includes: When the fan is in the off state, the target speed is determined to be the maximum speed of the fan.

8. A control device for a heat pump, characterized in that, The device includes an acquisition module, a determination module, and a control module, wherein: The acquisition module is used to acquire the environmental parameters and operating parameters of the heat pump device; wherein, the environmental parameters of the heat pump device include the outdoor ambient temperature where the heat pump device is located, and the operating parameters of the heat pump device include the operating frequency of the compressor of the heat pump device, the operating status of the fan of the heat pump device, the evaporation temperature of the evaporator of the heat pump device, and the evaporation pressure of the heat pump device; wherein, the operating status of the fan includes the start-up status, the running status, and the shutdown status. The determining module is used to determine the target speed of the fan based on the environmental parameters and operating parameters of the heat pump equipment; The control module is used to control the fan to operate at the target speed.

9. A heat pump device, characterized in that, include: Fan, compressor, evaporator, and controller, wherein the controller is used for: The environmental and operating parameters of the heat pump device are obtained; wherein, the environmental parameters of the heat pump device include the outdoor ambient temperature where the heat pump device is located, and the operating parameters of the heat pump device include the operating frequency of the compressor of the heat pump device, the operating status of the fan of the heat pump device, the evaporation temperature of the evaporator of the heat pump device, and the evaporation pressure of the heat pump device; wherein, the operating status of the fan includes the start-up state, the running state, and the shutdown state. The target speed of the fan is determined based on the environmental and operating parameters of the heat pump equipment; Control the fan to operate at the target speed.

10. A heat pump system, characterized in that, Includes the heat pump device as described in claim 9.

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