Air source heat pump unit control method and apparatus

Abstract

The application provides an air source heat pump unit control method and equipment, relates to the heat pump technical field, and is applied to the control system of an air source heat pump unit. The method comprises the following steps: acquiring suction pressure and actual operation pressure of a compressor in the air source heat pump unit, determining a safety pressure limit value corresponding to the suction pressure; determining a pressure difference value between the safety pressure limit value and the actual operation pressure; and adjusting the operation frequency of the compressor and the rotating speed of a fan according to the pressure difference value. The method provided by the application can improve the safety and overall operation energy efficiency of the air source heat pump unit, so that the operation energy efficiency of the entire air source heat pump unit is optimal.

Description

Technical Field

[0001] This invention belongs to the field of heat pump technology, specifically relating to a control method and equipment for an air source heat pump unit. Background Technology

[0002] An air source heat pump is an energy-saving device that uses high-grade energy to move heat from a low-grade heat source, air, to a high-grade heat source. It can effectively utilize low-grade heat energy that is difficult to apply, and has the beneficial effect of energy saving. Therefore, it is widely used in production and daily life.

[0003] In existing technologies, when the operating pressure of an air source heat pump unit is too high during operation, the operating frequency of the compressor is often reduced to lower the operating pressure, thereby ensuring the safe operation of the entire unit. However, if the operating pressure still exceeds the fixed high-pressure protection value when the compressor operating frequency is reduced to the minimum operating frequency, the overpressure protection mechanism will be triggered, controlling the heat pump unit to shut down.

[0004] However, the reliable operating pressure of the compressor is not constant under different operating conditions. Relying solely on a fixed high-pressure protection value as the control basis cannot guarantee the safe and efficient operation of the air source heat pump unit. Therefore, the existing control scheme needs further optimization. Summary of the Invention

[0005] This invention provides a control method and equipment for an air source heat pump unit to solve the problem of insufficient energy efficiency of air source heat pump units in the prior art.

[0006] One aspect of the present invention provides a control method for an air source heat pump unit, the method being applied to the control system of the air source heat pump unit, the method comprising:

[0007] Obtain the suction pressure and actual operating pressure of the compressor in the air source heat pump unit, and determine the safe pressure limit corresponding to the suction pressure;

[0008] Determine the pressure difference between the safe pressure limit and the actual operating pressure;

[0009] Based on the pressure difference, adjust the compressor's operating frequency and the fan's speed.

[0010] In the air source heat pump unit control method described above, optionally, determining the safety pressure limit corresponding to the suction pressure includes:

[0011] Based on the inhalation pressure and the preset relationship information, a safe pressure limit corresponding to the inhalation pressure is determined, wherein the preset relationship information characterizes the functional relationship between the inhalation pressure and the safe pressure limit.

[0012] In the air source heat pump unit control method described above, optionally, the control system includes a correspondence between the suction pressure and the safety pressure limit. Then, determining the safety pressure limit corresponding to the suction pressure includes:

[0013] Based on the obtained inhalation pressure, the safe pressure limit corresponding to the inhalation pressure is found in the correspondence, and the safe pressure limit is determined.

[0014] In the air source heat pump unit control method described above, optionally, adjusting the compressor's operating frequency and the fan's speed based on the pressure difference includes:

[0015] Based on the magnitude of the pressure difference, the operating frequency of the compressor is adjusted. When the operating frequency of the compressor is reduced to the minimum operating frequency, the speed of the fan is reduced according to the current pressure difference until the speed is reduced to the minimum speed.

[0016] In the air source heat pump unit control method described above, optionally, adjusting the compressor's operating frequency and the fan's speed based on the pressure difference includes:

[0017] Based on the magnitude of the pressure difference, adjustment parameters corresponding to the pressure difference are determined, wherein the adjustment parameters include adjustment parameters for the compressor's operating frequency and adjustment parameters for the fan's speed;

[0018] Adjust the compressor's operating frequency and the fan's speed according to the aforementioned adjustment parameters.

[0019] Optionally, in the air source heat pump unit control method described above, the air source heat pump unit includes at least two pressure sensors, which are used to measure the intake pressure and the actual operating pressure.

[0020] Another aspect of the present invention provides an air source heat pump unit control device, the device being applied to the control system of an air source heat pump unit, the device comprising:

[0021] The acquisition unit is used to acquire the suction pressure and actual operating pressure of the compressor in the air source heat pump unit, and determine the safety pressure limit corresponding to the suction pressure.

[0022] A calculation unit is used to determine the pressure difference between the safe pressure limit and the actual operating pressure;

[0023] The control unit is used to adjust the operating frequency of the compressor and the speed of the fan according to the pressure difference.

[0024] As described above, in the air source heat pump unit control device, the acquisition unit may optionally include a first determining module;

[0025] The first determining module is used to determine a safe pressure limit corresponding to the inhalation pressure based on the inhalation pressure and preset relationship information, wherein the preset relationship information represents the functional relationship between the inhalation pressure and the safe pressure limit.

[0026] As described above, the air source heat pump unit control device may optionally include a correspondence between the suction pressure and the safety pressure limit in the control system, and the acquisition unit includes a second determination module.

[0027] The second determining module is used to find the safe pressure limit corresponding to the inhalation pressure in the correspondence based on the obtained inhalation pressure, and determine the safe pressure limit.

[0028] Optionally, the control unit of the air source heat pump unit control device described above includes a first adjustment module;

[0029] The first adjustment module is used to adjust the operating frequency of the compressor according to the magnitude of the pressure difference. When the operating frequency of the compressor is reduced to the minimum operating frequency, the fan speed is reduced according to the current pressure difference until the speed is reduced to the minimum speed.

[0030] As described above, the air source heat pump unit control device may optionally include a parameter determination module and a parameter adjustment module;

[0031] The parameter determination module is used to determine the adjustment parameters corresponding to the pressure difference value based on the magnitude of the pressure difference value, wherein the adjustment parameters include the compressor operating frequency adjustment parameters and the fan speed adjustment parameters.

[0032] The parameter adjustment module is used to adjust the operating frequency of the compressor and the speed of the fan according to the adjustment parameters.

[0033] Optionally, the air source heat pump unit control device described above includes at least two pressure sensors for measuring the intake pressure and the actual operating pressure.

[0034] Another aspect of the present invention provides an electronic device, the electronic device including a processor and a memory communicatively connected to the processor;

[0035] The memory stores computer-executed instructions;

[0036] The processor executes computer execution instructions stored in the memory to implement the method as described in any of the foregoing descriptions.

[0037] Another aspect of the present invention provides a computer-readable storage medium storing computer-executable instructions that, when executed by a processor, are used to implement the method described in any of the foregoing embodiments.

[0038] Another aspect of the present invention provides a computer program product, including a computer program that, when executed by a processor, implements the method described in any of the foregoing descriptions.

[0039] This invention provides a control method and device for an air source heat pump unit. The method is applied to the control system of an air source heat pump unit and includes: acquiring the suction pressure and actual operating pressure of the compressor in the air source heat pump unit; determining a safety pressure limit corresponding to the suction pressure; determining the pressure difference between the safety pressure limit and the actual operating pressure; and adjusting the operating frequency of the compressor and the speed of the fan according to the pressure difference. By associating with the compressor's suction pressure, different suction pressures correspond to different safety pressure limits, eliminating the drawbacks of fixed safety pressure limits and improving the overall operating efficiency of the air source heat pump unit. Furthermore, by continuously adjusting the compressor's operating frequency and the fan speed according to the safety pressure limit corresponding to the suction pressure and the pressure difference between the actual operating pressure, the actual operating pressure of the compressor is adjusted, further optimizing the overall operating performance of the air source heat pump unit. Attached Figure Description

[0040] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only for illustration and explanation of the present invention, and the present invention is not limited to the specific embodiments described below.

[0041] Figure 1 This is a flowchart illustrating the control method for an air source heat pump unit provided in Embodiment 1 of the present invention.

[0042] Figure 2 This is a flowchart illustrating the air source heat pump unit control method provided in Embodiment 2 of the present invention;

[0043] Figure 3 This is a flowchart illustrating the air source heat pump unit control method provided in Embodiment 3 of the present invention;

[0044] Figure 4 This is a schematic diagram of the air source heat pump unit control device provided in Embodiment 4 of the present invention;

[0045] Figure 5 This is a schematic diagram of the air source heat pump unit control device provided in Embodiment 5 of the present invention;

[0046] Figure 6This is a schematic diagram of the structure of the electronic device provided in Embodiment Six of the present invention. Detailed Implementation

[0047] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only for illustration and explanation of the present invention, and the present invention is not limited to the specific embodiments described below.

[0048] Heat pumps use a reverse cycle to transfer heat from a low-temperature object to a high-temperature object. They require only a small amount of net reverse cycle work to generate a large amount of heat, effectively utilizing low-grade heat energy that is difficult to use otherwise. However, if the operating pressure of an air source heat pump unit is too high, exceeding the high-pressure protection value, it could be dangerous if no adjustment is made. Therefore, to ensure the safe operation of air source heat pump units, the operating pressure needs to be reduced when it is too high.

[0049] In one example, the operating pressure of the air source heat pump unit is reduced by decreasing the compressor's operating frequency. When the compressor's operating frequency is reduced to the minimum operating frequency, if the operating pressure still exceeds the fixed high-pressure protection value, the overpressure protection will be triggered, and the unit will shut down, thus ensuring the safe operation of the unit. The high-pressure protection value is the reliable operating high pressure of the compressor, also known as the safe pressure limit.

[0050] However, in actual operation, the compressor's safe pressure limit is not fixed; it changes with the suction pressure. The above control scheme not only fails to effectively correlate with the compressor's suction pressure, thus failing to guarantee the safe and efficient operation of the air source heat pump unit, but also directly shutting it down will affect the overall efficiency of the heat pump unit. In other words, the above control scheme is not the optimal overall solution and requires further optimization.

[0051] To improve the overall operating energy efficiency of air source heat pump units, this invention provides an air source heat pump unit control method. Based on the difference between the safety pressure limit corresponding to the suction pressure and the actual operating pressure, the operating frequency of the compressor and the speed of the fan are controlled, thereby adjusting the actual operating pressure of the compressor to optimize the overall operation of the entire heat pump unit.

[0052] The following provides a detailed description of the air source heat pump unit control method and equipment provided in this embodiment. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of the present invention will now be described with reference to the accompanying drawings.

[0053] Example 1

[0054] Figure 1This is a flowchart illustrating the control method for an air source heat pump unit provided in Embodiment 1 of the present invention.

[0055] Reference Figure 1 As shown, this embodiment provides a control method for an air source heat pump unit, which is applied to the control system of the air source heat pump unit. The executing entity in this embodiment can be the control system of the air source heat pump unit, which can be located on the control device of the air source heat pump unit. This embodiment takes the control system of the air source heat pump unit as an example to illustrate the method in detail, which includes:

[0056] S101. Obtain the suction pressure and actual operating pressure of the compressor in the air source heat pump unit, and determine the safety pressure limit corresponding to the suction pressure.

[0057] For example, an air source heat pump unit may be equipped with measuring devices such as pressure sensors or temperature sensors. The control system can directly measure the compressor's suction pressure and actual operating pressure through the pressure sensor; or measure the temperature through the temperature sensor and convert it into the corresponding suction pressure and actual operating pressure.

[0058] In one example, the air source heat pump unit includes at least two pressure sensors used to measure the intake pressure and the actual operating pressure.

[0059] For example, an air source heat pump unit includes at least two pressure sensors, with multiple pressure sensors set in different locations, for accurately measuring the compressor's suction pressure and actual operating pressure.

[0060] Because the reliable operating high pressure (i.e., the safe pressure limit) of the compressor changes as the suction pressure increases, meaning the safe pressure limit of the compressor differs under different suction pressures, this invention links the control scheme of the air source heat pump unit with the compressor's suction pressure. This allows different suction pressures to correspond to different safe pressure limits, eliminating the drawbacks of fixed safe pressure limits and improving the overall operating efficiency of the air source heat pump unit.

[0061] Once the compressor's suction pressure is obtained, the control system needs to determine the corresponding safe pressure limit based on the suction pressure. This invention does not impose restrictions on how the control system determines the safe pressure limit corresponding to the suction pressure.

[0062] In one example, determining the safe pressure limit corresponding to the inhalation pressure includes: determining the safe pressure limit corresponding to the inhalation pressure based on the inhalation pressure and preset relationship information, wherein the preset relationship information characterizes the functional relationship between the inhalation pressure and the safe pressure limit.

[0063] For example, the relationship between inhalation pressure and the safety pressure limit can be fitted into a functional expression as preset relationship information. When the control system obtains the inhalation pressure, it substitutes the inhalation pressure into the functional expression based on the inhalation pressure and the preset relationship information to calculate the safety pressure limit corresponding to the inhalation pressure.

[0064] In one example, the control system includes a correspondence between inhalation pressure and safety pressure limits. Determining the safety pressure limit corresponding to the inhalation pressure includes: finding the safety pressure limit corresponding to the inhalation pressure in the correspondence based on the obtained inhalation pressure, and determining the safety pressure limit.

[0065] For example, a correspondence can be established between the compressor's suction pressure and the safety pressure limit, and this correspondence can be stored in the control system in a table or other form. When the control system obtains the compressor's suction pressure, it searches for the corresponding safety pressure limit in the correspondence between suction pressure and safety pressure limit to determine the safety pressure limit corresponding to the suction pressure.

[0066] S102. Determine the pressure difference between the safe pressure limit and the actual operating pressure.

[0067] For example, after the control system obtains the suction pressure and actual operating pressure of the compressor in the air source heat pump unit and determines the safety pressure limit corresponding to the suction pressure, it subtracts the current actual operating pressure from the safety pressure limit corresponding to the current suction pressure to obtain the current pressure difference between the two.

[0068] S103. Adjust the compressor's operating frequency and the fan's speed according to the pressure difference.

[0069] For example, after the control system determines the pressure difference between the safe pressure limit and the actual operating pressure, it continuously adjusts the operating frequency of the compressor and the speed of the fan according to the magnitude of the pressure difference, so that the air source heat pump unit can operate safely and efficiently within the safe pressure limit.

[0070] Adjusting the compressor's operating frequency can include frequency control methods such as slow frequency increase, frequency reduction prohibition, slow frequency decrease, and fast frequency decrease; adjusting the fan speed can include speed control methods such as increasing the fan speed and decreasing the fan speed; the specific control method can be flexibly determined according to the magnitude of the pressure difference.

[0071] For example, when the pressure difference is large, it indicates that the current actual operating pressure is far from reaching the safe pressure limit. The compressor power can be increased further. That is, the compressor can be controlled to slowly increase its frequency and / or the fan speed can be increased to improve the overall efficiency of the air source heat pump unit. However, if the pressure difference is small, it indicates that the compressor's current actual operating pressure is close to the safe pressure limit. If it continues to increase, it may exceed the safe pressure limit, causing the air source heat pump unit to shut down due to high-pressure protection. Therefore, the compressor can be controlled to use frequency control methods such as prohibiting frequency increase, slow frequency decrease, and fast frequency decrease, and / or reducing the fan speed to reduce the actual operating pressure, allowing the air source heat pump unit to continue operating within the safe pressure limit.

[0072] Based on the pressure difference, both the compressor's operating frequency and the fan speed can be adjusted simultaneously to bring the air source heat pump unit to its target operating state as quickly as possible, thereby improving its operational safety. Alternatively, the compressor's operating frequency can be adjusted first, followed by the fan speed, depending on the magnitude of the pressure difference. That is, if adjusting the compressor's operating frequency cannot meet the operational requirements, then adjusting the fan speed can minimize the impact on power consumption while ensuring the safe operation of the air source heat pump unit, thus optimizing its overall performance.

[0073] The air source heat pump unit control method provided by this invention is applied to the control system of an air source heat pump unit. It determines a safe pressure limit corresponding to the suction pressure by acquiring the compressor's suction pressure and actual operating pressure. Then, it determines the pressure difference between the safe pressure limit and the actual operating pressure. Finally, it adjusts the compressor's operating frequency and the fan's speed based on the pressure difference. On one hand, the control scheme of this invention is linked to the compressor's suction pressure; different suction pressures correspond to different safe pressure limits, eliminating the drawbacks of fixed safe pressure limits and improving the overall operating efficiency of the air source heat pump unit. On the other hand, this invention continuously adjusts the compressor's operating frequency and the fan's speed based on the safe pressure limit corresponding to the suction pressure and the pressure difference between the actual operating pressure and the actual operating pressure, thereby adjusting the compressor's actual operating pressure and further optimizing the overall operation of the air source heat pump unit.

[0074] Example 2

[0075] Figure 2 This is a flowchart illustrating the air source heat pump unit control method provided in Embodiment 2 of the present invention.

[0076] Reference Figure 2As shown, this embodiment provides a control method for an air source heat pump unit, which is applied to the control system of the air source heat pump unit. The executing entity in this embodiment can be the control system of the air source heat pump unit, which can be located on the control device of the air source heat pump unit. This embodiment takes the control system of the air source heat pump unit as an example to illustrate the method in detail, which includes:

[0077] S201. Obtain the suction pressure and actual operating pressure of the compressor in the air source heat pump unit, and determine the safety pressure limit corresponding to the suction pressure.

[0078] S202. Determine the pressure difference between the safe pressure limit and the actual operating pressure.

[0079] For example, the specific implementations of steps S201 and S202 are similar to those of steps S101 and S102, and will not be described again in this embodiment.

[0080] S203. Adjust the compressor's operating frequency according to the pressure difference. When the compressor's operating frequency drops to the minimum operating frequency, reduce the fan speed according to the current pressure difference until the speed drops to the minimum speed.

[0081] For example, after the control system determines the pressure difference between the safe pressure limit and the actual operating pressure, it first adjusts the compressor's operating frequency according to the magnitude of the pressure difference. This invention does not limit the specific value of the pressure difference; different pressure differences correspond to different compressor operating frequency adjustment methods.

[0082] For example, the pressure difference can be divided into multiple threshold ranges, with different pressure difference threshold ranges corresponding to different compressor operating frequency adjustment methods. For instance, if the pressure difference between the safe pressure limit and the actual operating pressure is within a first preset threshold range, such as between 0.3 and 0.4 MPa, i.e., the pressure difference is relatively large, it indicates that the actual operating pressure of the compressor is too low, and the compressor has not yet reached its optimal operating frequency. In this situation, the control system controls the compressor to slowly increase its frequency to improve the overall power of the air source heat pump unit.

[0083] For example, if the pressure difference is within the second preset threshold range, such as between 0.2 and 0.3 MPa, i.e., within a suitable range, it indicates that the compressor can operate safely and efficiently. In this situation, the control system prevents the compressor from increasing its frequency and keeps it running at its original operating frequency to maintain the safe and efficient operation of the air source heat pump unit.

[0084] For example, if the pressure difference is within the third preset threshold range, such as between 0.1 and 0.2 MPa, indicating a relatively small pressure difference, it suggests that the actual operating pressure of the compressor is slightly too high. If the compressor's operating frequency is not reduced at this time, the actual operating pressure will continue to rise, potentially exceeding the safety pressure limit. In this situation, the control system controls the compressor to slowly reduce its frequency, preventing the actual operating pressure from continuing to rise and thus ensuring the safe operation of the air source heat pump unit.

[0085] For example, if the pressure difference is within the fourth preset threshold range, such as between 0 and 0.1 MPa, i.e., the pressure difference is very small, it indicates that the actual operating pressure is close to the safe pressure limit, and the actual operating pressure of the compressor needs to be reduced quickly. In this situation, the control system controls the compressor to rapidly reduce its frequency to meet the need to quickly reduce the actual operating pressure of the compressor, thereby ensuring the safe operation of the air source heat pump unit.

[0086] In addition, the pressure difference can be divided into other threshold ranges, and other different compressor operating frequency adjustment methods can be used for control. This invention does not impose any limitations.

[0087] When the compressor's operating frequency has been reduced to the minimum operating frequency, if the actual operating pressure of the compressor is still too high, the control system reduces the fan speed based on the current pressure difference until the speed is reduced to the minimum. This invention does not impose restrictions on how the fan speed is reduced based on the magnitude of the current pressure difference.

[0088] Since reducing the fan speed decreases the overall efficiency of the air source heat pump unit, the fan speed can be reduced in small, multiple increments. For example, the control system can gradually reduce the fan speed based on the current pressure difference, decreasing it by a certain amount each time, such as 100 revolutions per minute. After maintaining this reduction for a certain period, the speed can be further reduced until the actual operating pressure reaches the optimal operating pressure. Then, the fan speed can be kept constant, and operation can continue. If the actual operating pressure is still higher than the safety pressure limit when the fan speed is reduced to the minimum, the unit should be shut down. This control method maximizes both the safety and efficiency of the air source heat pump unit.

[0089] In one example, when the control system controls the fan speed based on the current pressure difference, it can also take other measures. For example, if the current pressure difference is relatively large, the speed of the fan can be reduced by a relatively large value so that the actual operating pressure can be reduced as quickly as possible to ensure the safety of the air source heat pump unit.

[0090] In addition, when adjusting the operating frequency of the compressor and the speed of the fan, the frequency of the throttling device and the operating status of other equipment in the air source heat pump unit, such as the opening degree of the flow control valve, can also be adjusted simultaneously to match the operating frequency of the compressor and the speed of the fan with other equipment, thus preventing abnormal operation of the air source heat pump unit.

[0091] The air source heat pump unit control method provided in this invention is applied to the control system of an air source heat pump unit. It determines a safe pressure limit corresponding to the suction pressure by acquiring the compressor's suction pressure and actual operating pressure. Then, it determines the pressure difference between the safe pressure limit and the actual operating pressure. Next, it adjusts the compressor's operating frequency based on the pressure difference. When the compressor's operating frequency drops to the minimum operating frequency, it further reduces the fan speed based on the current pressure difference until the speed reaches the minimum. This control scheme optimizes the operation of the entire air source heat pump unit by first adjusting the compressor's operating frequency and then adjusting the fan speed. This ensures the safe operation of the air source heat pump unit, reduces the impact on overall power, and optimizes the overall performance of the air source heat pump unit.

[0092] Example 3

[0093] Figure 3 This is a flowchart illustrating the air source heat pump unit control method provided in Embodiment 3 of the present invention.

[0094] Reference Figure 3 As shown, this embodiment provides a control method for an air source heat pump unit, which is applied to the control system of the air source heat pump unit. The executing entity in this embodiment can be the control system of the air source heat pump unit, which can be located on the control device of the air source heat pump unit. This embodiment takes the control system of the air source heat pump unit as an example to illustrate the method in detail, which includes:

[0095] S301. Obtain the suction pressure and actual operating pressure of the compressor in the air source heat pump unit, and determine the safety pressure limit corresponding to the suction pressure.

[0096] S302. Determine the pressure difference between the safe pressure limit and the actual operating pressure.

[0097] For example, the specific implementations of steps S301 and S302 are similar to those of steps S101 and S102, and will not be described again in this embodiment.

[0098] S303. Based on the magnitude of the pressure difference, determine the adjustment parameters corresponding to the pressure difference, including the compressor operating frequency adjustment parameters and the fan speed adjustment parameters.

[0099] For example, after the control system determines the pressure difference between the safe pressure limit and the actual operating pressure, it determines the corresponding adjustment parameters for the compressor's operating frequency and the fan's speed, based on the magnitude of the pressure difference. Different pressure difference values ​​correspond to different adjustment parameters.

[0100] This invention does not limit the specific values ​​of the adjustment parameters corresponding to the pressure difference. In one example, if the pressure difference between the safe pressure limit and the actual operating pressure is within a large range, it indicates that the compressor's actual operating pressure is too low and the compressor has not yet reached its optimal operating frequency. While ensuring operational safety, the compressor's operating frequency and the fan speed can be increased simultaneously by setting corresponding operating frequency and speed adjustment parameters, thereby increasing the compressor's actual operating pressure and improving the energy efficiency of the air source heat pump unit. Conversely, if the pressure difference between the safe pressure limit and the actual operating pressure is within a small range, it indicates that the compressor's actual operating pressure is too high. The actual operating pressure needs to be reduced. This can be achieved by simultaneously decreasing the compressor's operating frequency and the fan speed by setting corresponding operating frequency and speed adjustment parameters, thereby reducing the compressor's actual operating pressure and ensuring the safe operation of the air source heat pump unit.

[0101] When setting adjustment parameters, the compressor's operating frequency adjustment parameter can be a positive parameter, a negative parameter, or zero; similarly, the fan speed adjustment parameter can also be a positive parameter, a negative parameter, or zero. This invention does not impose any limitations.

[0102] S304. Adjust the compressor's operating frequency and the fan's speed according to the adjustment parameters.

[0103] For example, after determining the adjustment parameters based on the pressure difference, the control system adjusts the compressor's operating frequency according to the compressor's operating frequency adjustment parameters, and simultaneously adjusts the fan's speed according to the fan speed adjustment parameters. By simultaneously adjusting the compressor's operating frequency and the fan's speed, the air source heat pump unit can reach its optimal operating power or its safest operating pressure as quickly as possible.

[0104] The air source heat pump unit control method provided in this invention is applied to the control system of an air source heat pump unit. It obtains the compressor's suction pressure and actual operating pressure within the air source heat pump unit, determines the safe pressure limit corresponding to the suction pressure, then determines the pressure difference between the safe pressure limit and the actual operating pressure, and then determines adjustment parameters corresponding to the pressure difference based on the magnitude of the pressure difference. These adjustment parameters include compressor operating frequency adjustment parameters and fan speed adjustment parameters. Based on these adjustment parameters, the compressor's operating frequency and the fan speed are simultaneously adjusted. This control scheme, by simultaneously adjusting the compressor's operating frequency and the fan speed, enables the air source heat pump unit to reach its optimal operating power or the safest operating pressure as quickly as possible, resulting in better operation of the entire air source heat pump unit and optimizing its overall performance.

[0105] Example 4

[0106] Figure 4 This is a schematic diagram of the air source heat pump unit control device provided in Embodiment 4 of the present invention.

[0107] Reference Figure 4 As shown, this embodiment provides an air source heat pump unit control device 40, which is applied to the control system of an air source heat pump unit. The device 40 includes: an acquisition unit 401, a calculation unit 402, and a control unit 403.

[0108] The acquisition unit 401 is used to acquire the suction pressure and actual operating pressure of the compressor in the air source heat pump unit, and to determine the safety pressure limit corresponding to the suction pressure.

[0109] The calculation unit 402 is used to determine the pressure difference between the safe pressure limit and the actual operating pressure.

[0110] Control unit 403 is used to adjust the operating frequency of the compressor and the speed of the fan according to the pressure difference.

[0111] The apparatus provided in this embodiment can be used to execute the methods of the above embodiments. Its implementation principle and technical effects are similar, and will not be described again here.

[0112] Example 5

[0113] Figure 5 This is a schematic diagram of the air source heat pump unit control device provided in Embodiment 5 of the present invention.

[0114] Reference Figure 5 As shown, this embodiment provides an air source heat pump unit control device 50, which is applied to the control system of an air source heat pump unit. The device 50 includes: an acquisition unit 501, a calculation unit 502, and a control unit 503.

[0115] The acquisition unit 501 is used to acquire the suction pressure and actual operating pressure of the compressor in the air source heat pump unit, and to determine the safety pressure limit corresponding to the suction pressure.

[0116] The calculation unit 502 is used to determine the pressure difference between the safe pressure limit and the actual operating pressure.

[0117] Control unit 503 is used to adjust the operating frequency of the compressor and the speed of the fan according to the pressure difference.

[0118] In one example, the acquisition unit 501 includes a first determination module 5011.

[0119] The first determining module 5011 is used to determine the safe pressure limit corresponding to the inhalation pressure based on the inhalation pressure and preset relationship information, wherein the preset relationship information represents the functional relationship between the inhalation pressure and the safe pressure limit.

[0120] In one example, the control system includes a correspondence between the intake pressure and the safety pressure limit, and the acquisition unit 501 includes a second determination module 5012.

[0121] The second determining module 5012 is used to find the safe pressure limit corresponding to the inhalation pressure in the corresponding relationship based on the obtained inhalation pressure, and determine the safe pressure limit.

[0122] In one example, the control unit 503 includes a first adjustment module 5031.

[0123] The first adjustment module 5031 is used to adjust the operating frequency of the compressor according to the pressure difference. When the operating frequency of the compressor is reduced to the minimum operating frequency, the fan speed is reduced according to the current pressure difference until the speed is reduced to the minimum speed.

[0124] In one example, the control unit 503 includes a parameter determination module 5032 and a parameter adjustment module 5033.

[0125] The parameter determination module 5032 is used to determine the adjustment parameters corresponding to the pressure difference based on the magnitude of the pressure difference. The adjustment parameters include the operating frequency adjustment parameters of the compressor and the speed adjustment parameters of the fan.

[0126] The parameter adjustment module 5033 is used to adjust the operating frequency of the compressor and the speed of the fan according to the adjustment parameters.

[0127] In one example, the air source heat pump unit includes at least two pressure sensors used to measure the intake pressure and the actual operating pressure.

[0128] The apparatus provided in this embodiment can be used to execute the methods of the above embodiments. Its implementation principle and technical effects are similar, and will not be described again here.

[0129] It should be noted that the division of the various modules in the above device is merely a logical functional division. In actual implementation, they can be fully or partially integrated into a single physical entity, or they can be physically separated. Furthermore, these modules can be implemented entirely in software through processing element calls; they can be implemented entirely in hardware; or some modules can be implemented by processing element calls to software, while others are implemented in hardware.

[0130] Example 6

[0131] Figure 6 This is a schematic diagram of the structure of the electronic device provided in Embodiment Six of the present invention.

[0132] Reference Figure 6 As shown, the electronic device 60 provided in this embodiment includes: a processor 601 and a memory 602 that is communicatively connected to the processor.

[0133] The memory 602 stores computer-executable instructions; the processor 601 executes the computer-executable instructions stored in the memory 602 to implement any of the methods described above.

[0134] In the specific implementation of the aforementioned electronic device, it should be understood that the processor can be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), etc. A general-purpose processor can be a microprocessor or any conventional processor. The methods 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.

[0135] Furthermore, embodiments of the present invention also provide a computer-readable storage medium storing computer-executable instructions, which, when executed by a processor, are used to implement the methods described in any of the foregoing.

[0136] Those skilled in the art will understand that all or part of the steps of the above-described method embodiments can be implemented by hardware related to computer instructions. The aforementioned program can be stored in a computer-readable storage medium. When executed, the program performs the steps of the above-described method embodiments; and the aforementioned storage medium includes various media capable of storing program code, such as ROM, RAM, magnetic disks, or optical disks.

[0137] This invention also provides a computer program product, which includes a computer program that, when executed by a processor, is used to implement the method as described in any of the foregoing embodiments.

[0138] It should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0139] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0140] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0141] In the above description, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0142] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention 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; and these 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 the present invention.

Claims

1. A control method for an air source heat pump unit, characterized in that, The method is applied to the control system of an air source heat pump unit, and the method includes: Obtain the suction pressure and actual operating pressure of the compressor in the air source heat pump unit, and determine the safe pressure limit corresponding to the suction pressure; Determine the pressure difference between the safe pressure limit and the actual operating pressure; Based on the pressure difference, adjust the compressor's operating frequency and the fan's speed; The step of adjusting the compressor's operating frequency and the fan's speed based on the pressure difference includes: Based on the magnitude of the pressure difference, the operating frequency of the compressor is adjusted. When the operating frequency of the compressor is reduced to the minimum operating frequency, the speed of the fan is reduced according to the current pressure difference until the speed is reduced to the minimum speed. If the actual operating pressure is still higher than the safe pressure limit when the fan speed is reduced to the minimum speed, then the fan should be shut down.

2. The method according to claim 1, characterized in that, Determining the safe pressure limit corresponding to the inhalation pressure includes: Based on the inhalation pressure and the preset relationship information, a safe pressure limit corresponding to the inhalation pressure is determined, wherein the preset relationship information characterizes the functional relationship between the inhalation pressure and the safe pressure limit.

3. The method according to claim 1, characterized in that, The control system includes a correspondence between the inhalation pressure and the safety pressure limit. Therefore, determining the safety pressure limit corresponding to the inhalation pressure includes: Based on the obtained inhalation pressure, the safe pressure limit corresponding to the inhalation pressure is found in the correspondence, and the safe pressure limit is determined.

4. The method according to claim 1, characterized in that, The step of adjusting the compressor's operating frequency and the fan's speed based on the pressure difference includes: Based on the magnitude of the pressure difference, adjustment parameters corresponding to the pressure difference are determined, wherein the adjustment parameters include adjustment parameters for the operating frequency of the compressor and adjustment parameters for the speed of the fan; Adjust the compressor's operating frequency and the fan's speed according to the aforementioned adjustment parameters.

5. The method according to any one of claims 1-4, characterized in that, The air source heat pump unit includes at least two pressure sensors, which are used to measure the intake pressure and the actual operating pressure.

6. A control device for an air source heat pump unit, characterized in that, The device is used in the control system of an air source heat pump unit, and the device includes: The acquisition unit is used to acquire the suction pressure and actual operating pressure of the compressor in the air source heat pump unit, and determine the safety pressure limit corresponding to the suction pressure. A calculation unit is used to determine the pressure difference between the safe pressure limit and the actual operating pressure; The control unit is used to adjust the operating frequency of the compressor and the speed of the fan according to the pressure difference. The control unit is specifically used to adjust the operating frequency of the compressor according to the magnitude of the pressure difference. When the operating frequency of the compressor is reduced to the minimum operating frequency, the fan speed is reduced according to the current pressure difference until the speed is reduced to the minimum speed. If the actual operating pressure is still higher than the safe pressure limit when the fan speed is reduced to the minimum speed, then the fan should be shut down.

7. An electronic device, characterized in that, The electronic device includes a processor and a memory communicatively connected to the processor; The memory stores computer-executed instructions; The processor executes computer execution instructions stored in the memory to implement the method as described in any one of claims 1-5.

8. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer-executable instructions, which, when executed by a processor, are used to implement the method as described in any one of claims 1-5.

9. A computer program product, characterized in that, Includes a computer program that, when executed by a processor, implements the method of any one of claims 1-5.

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