Control Method, Device, Air Source Heat Pump Unit and Medium of Direct Current Water Pump

Abstract

The present invention provides a control method, device, air source heat pump unit and medium for a direct current water pump. The method includes: presetting the theoretical outlet water temperature corresponding to multiple water pump control programs at different ambient temperatures; selecting one of the multiple water pump control programs as a test program and driving the direct current water pump to run according to the test program; obtaining the current ambient temperature and the actual outlet water temperature when the direct current water pump runs according to the test program; obtaining the theoretical outlet water temperature corresponding to the direct current water pump under the test program and the current ambient temperature; comparing the actual outlet water temperature with the theoretical outlet water temperature; judging whether the model of the direct current water pump corresponding to the test program that matches the actually used direct current water pump model according to the comparison result of the actual outlet water temperature and the theoretical outlet water temperature; if they do not match, then controlling to execute the running step. The method of the present invention can automatically identify the situation where the direct current water pump model does not match, ensuring the heating effect and operation reliability of the air source heat pump.

Description

Technical Field

[0001] The present invention relates to the field of air source heat pumps, and in particular to a control method and device for a direct current water pump, an air source heat pump unit and a medium. Background Art

[0002] With the vigorous promotion of "coal to electricity" and "gas to electricity", air source heat pumps have become the new darling of the market and are currently being increasingly widely used in the heating industry.

[0003] The air source heat pump unit is an energy-saving device that uses high-level energy to make heat flow from low-level heat source air to high-level heat source. The air source heat pump unit usually includes a circulation system consisting of a compressor, a condenser, a throttle, an evaporator, a water pump and a hot water tank. The heat medium (also called the refrigerant) circulates in the system under the action of the water pump. It completes the gaseous pressure and temperature increase process in the compressor (the temperature is as high as 80-100°C). After entering the condenser, it releases high-temperature heat to heat the cold water in the hot water tank. At the same time, it is cooled and converted into liquid. When it runs to the evaporator, the liquid quickly absorbs heat and evaporates and converts into gas again. At the same time, the temperature drops to minus 20°C-30°C. At this time, the air around the evaporator will continuously transfer low-temperature heat to the heat medium. The continuous circulation of the heat medium realizes the process of converting low-temperature heat in the air into high-temperature heat and heating cold water.

[0004] The water pump is an important component of the air source heat pump, and the DC shielded pump has the advantages of high energy efficiency, infinitely adjustable flow rate and low noise, which makes it in short supply in the market. However, it is difficult for different DC shielded pump manufacturers to make the parameters of the DC shielded pump consistent, which causes the air source heat pump manufacturers to encounter some troubles when using the DC shielded pump. That is, due to the different control parameters of the DC shielded pumps of different manufacturers, the air source heat pump unit needs to adopt different control schemes to match it. For example: the shielded pump of manufacturer A needs the A' water pump control program to match it, and the shielded pump of manufacturer B needs the B' water pump control program to match it. Therefore, when producing air source heat pump units, it is necessary to distinguish and use DC shielded pumps from different manufacturers. As a result, it is easy for the DC shielded pump to not match the whole machine controller of the air source heat pump unit. If the shielded pump does not match the whole machine controller, it may affect the outlet water temperature and water output of the air source heat pump unit, thereby affecting the heating effect or reliability of the air source heat pump. Because such problems are relatively hidden, air source heat pump factory inspections may not be able to effectively detect them. Therefore, there is a possibility that such air source heat pump units with quality problems will enter the market. Summary of the invention

[0005] In view of the above problems, the present invention provides a control method, device, air source heat pump unit and medium for a direct current water pump, which can automatically identify the situation where the actually used direct current water pump does not match the matching direct current water pump model corresponding to the water pump control program, and ensure the accuracy of the use of the direct current water pump, as well as the heating effect and operation reliability of the air source heat pump.

[0006] The present invention provides a control method for a direct current water pump used in an air source heat pump unit, including the following steps:

[0007] Presetting step: Presetting the theoretical water outlet temperatures corresponding to multiple water pump control programs of the direct current water pump of the air source heat pump unit at different ambient temperatures;

[0008] Operating step: Selecting one of the preset multiple water pump control programs as a test program and driving the direct current water pump to operate with the test program;

[0009] First obtaining step: Obtaining the current ambient temperature and the actual water outlet temperature of the air source heat pump unit when the direct current water pump operates with the test program;

[0010] Second obtaining step: Obtaining the theoretical water outlet temperature corresponding to the test program and the current ambient temperature of the direct current water pump;

[0011] Comparing step: Comparing the actual water outlet temperature with the theoretical water outlet temperature;

[0012] Judging step: Judging whether the model of the matching direct current water pump corresponding to the test program matches the model of the actually used direct current water pump according to the comparison result of the actual water outlet temperature and the theoretical water outlet temperature;

[0013] Controlling step: If the model of the matching direct current water pump matches the model of the actually used direct current water pump, controlling the direct current water pump to operate with the test program; if the model of the matching direct current water pump does not match the model of the actually used direct current water pump, controlling the execution of the operation module.

[0014] When the matching DC water pump model corresponding to the water pump control program matches the model of the DC water pump actually used, the actual water outlet temperature of the air source heat pump unit can be close to the theoretical water outlet temperature, and the operating efficiency of the air source heat pump unit is high; when the matching DC water pump model corresponding to the water pump control program does not match the model of the DC water pump actually used, the actual water outlet temperature of the air source heat pump unit may differ greatly from the theoretical water outlet temperature, and the operating efficiency of the air source heat pump unit is low. The control method of the present invention is actually a compatible water pump control program. Even if the DC water pump model actually used does not match the matching DC water pump model of the water pump control program, it can automatically identify and automatically correct errors, match the correct water pump control program, thereby ensuring the accuracy of the use of the DC water pump and the heating effect or reliability of the air source heat pump. In addition, the water outlet temperature is associated with the ambient temperature. When the ambient temperature is low, the water outlet temperature is also low. When the ambient temperature is high, the water outlet temperature is relatively high. By detecting the current ambient temperature and the actual water outlet temperature at the current ambient temperature and comparing it with the theoretical water outlet temperature at the corresponding ambient temperature, the accuracy of the comparison result is improved, thereby improving the accuracy of the judgment result. The method of the present invention can utilize the temperature detection device provided by the air source heat pump system to detect the outlet water temperature without adding any additional accessories, which is beneficial to saving manufacturing costs.

[0015] In an optional technical solution of the present invention, the multiple water pump control programs are the same water pump control program, and the water pump duty cycles of the multiple water pump control programs are different.

[0016] According to the technical solution, the flow rates of DC water pumps produced by different DC water pump manufacturers are different under the same duty cycle. Based on this, when other parameters are the same (such as the compressor frequency, ambient temperature, outdoor fan gear and water output are constant), the outlet water temperatures corresponding to different water pump duty cycles are different. By controlling the air source heat pump unit to operate under the specified water pump duty cycle, the actual outlet water temperature of the air source heat pump unit under the water pump duty cycle can be obtained, and compared with the theoretical outlet water temperature corresponding to the duty cycle, it can be known whether the matching DC water pump model corresponding to the test program is consistent with the actually operating DC water pump model, so that the air source heat pump unit and the DC water pump are matched for operation; in addition, only by controlling the water pump duty cycle to operate the air source heat pump unit, and based on the comparison result of the actual outlet water temperature and the theoretical outlet water temperature, it can be judged whether the DC water pump model actually used is correct. The method is simple and easy to operate, which is conducive to improving the judgment and detection efficiency.

[0017] In an optional technical solution of the present invention, in the operation step, when the DC water pump is operated for the first time in a test program, the air source heat pump unit is controlled to reach the temperature without stopping.

[0018] According to this technical solution, when the set outlet water temperature of the air source heat pump unit is relatively low, the air source heat pump unit may reach the set temperature and stop operating at the initial stage of operation. By controlling the air source heat pump unit not to reach the set temperature and stop operating when the DC water pump runs for the first time with the test program, the smoothness of the operation of the DC water pump control method can be improved, and the efficiency of the DC water pump type selection judgment can be enhanced.

[0019] In an alternative technical solution of the present invention, in the first acquisition step, when the DC water pump runs for the first time with the test program, first detect the current ambient temperature, and after the air source heat pump unit operates stably, detect the actual outlet water temperature.

[0020] According to this technical solution, detecting the actual outlet water temperature after the unit operates stably is conducive to improving the accuracy of the detection result of the actual outlet water temperature, and further improving the accuracy of the judgment result.

[0021] In an alternative technical solution of the present invention, in the judgment step, "judging whether the model of the DC water pump corresponding to the test program matches the model of the DC water pump actually used according to the comparison result of the actual outlet water temperature and the theoretical outlet water temperature" includes: when the difference between the actual outlet water temperature and the theoretical outlet water temperature is within the specified numerical range, the model of the DC water pump matches the model of the DC water pump actually used.

[0022] According to this technical solution, when the difference between the actual outlet water temperature and the theoretical outlet water temperature is within the specified numerical range, it indicates that the difference between the actual outlet water temperature and the theoretical outlet water temperature is small, and the actual outlet water temperature is relatively close to the theoretical outlet water temperature. Therefore, the model of the DC water pump is correctly matched.

[0023] In an alternative technical solution of the present invention, in the judgment step, "judging whether the model of the DC water pump corresponding to the test program matches the model of the DC water pump actually used according to the comparison result of the actual outlet water temperature and the theoretical outlet water temperature" includes: when the difference between the actual outlet water temperature and the theoretical outlet water temperature is not within the specified numerical range, the model of the DC water pump does not match the model of the DC water pump actually used.

[0024] According to this technical solution, when the difference between the actual outlet water temperature and the theoretical outlet water temperature is not within the specified numerical range, it indicates that the difference between the actual outlet water temperature and the theoretical outlet water temperature is large, and the model of the DC water pump actually used is not correctly matched.

[0025] In an alternative technical solution of the present invention, the air source heat pump unit at least includes a compressor and an outdoor fan, and the control method further includes: in the operation step, when the DC water pump operates under the test program, the corresponding compressor frequency, the operation gear of the outdoor fan and the water output are constant; in the preset step, the theoretical outlet water temperature is obtained under the specified experimental conditions, and the specified experimental conditions are the same compressor frequency, the operation gear of the outdoor fan and the water output as in the operation step.

[0026] According to this technical solution, in the operation step and the preset step, by controlling the compressor frequency, the operation gear of the outdoor fan, and the water output to be constant and the same, the influence of different compressor frequencies, different outdoor fan gears, and different water outputs on the water outlet temperature can be avoided, and the accuracy of the judgment result can be improved.

[0027] The present invention further provides a control device for a direct current water pump of an air source heat pump unit, including:

[0028] A preset module that presets the theoretical water outlet temperature corresponding to multiple water pump control programs of the direct current water pump of the air source heat pump unit at different ambient temperatures;

[0029] An operation module that selects one of the preset multiple water pump control programs as a test program and drives the direct current water pump to operate according to the test program;

[0030] A first acquisition module that is communicatively connected to the operation module. The first acquisition module is used to acquire the current ambient temperature and the actual water outlet temperature of the air source heat pump unit when the direct current water pump operates according to the test program;

[0031] A second acquisition module that is communicatively connected to the preset module. The second acquisition module is used to acquire the theoretical water outlet temperature corresponding to the direct current water pump under the test program and the current ambient temperature;

[0032] A comparison module that is communicatively connected to the first acquisition module and the second acquisition module. The comparison module is used to compare the actual water outlet temperature and the theoretical water outlet temperature;

[0033] A judgment module that judges whether the model of the direct current water pump matched under the test program matches the model of the direct current water pump according to the comparison result of the actual water outlet temperature and the theoretical water outlet temperature;

[0034] A control module that is communicatively connected to the judgment module, the direct current water pump, and the operation module. If the model of the direct current water pump matches the test program, the control module controls the direct current water pump to operate according to the test program; if the model of the direct current water pump does not match the test program, the control module controls the execution of the operation module.

[0035] The present invention further provides an air source heat pump unit, including a control device for a direct current water pump of the air source heat pump unit, and the control device executes the above-mentioned control method for the direct current water pump of the air source heat pump unit.

[0036] The present invention further provides a computer-readable storage medium storing a computer program, and when the computer program is executed by a processor, the steps of the above-mentioned control method for the direct current canned motor pump of the air source heat pump unit are implemented. Description of the Drawings

[0037] Figure 1 It is a schematic structural diagram of an air source heat pump unit in an embodiment of the present invention.

[0038] Figure 2 This is a schematic diagram of the hydraulic performance curve of the DC water pump in the embodiment of the present invention.

[0039] Figure 3 This is a schematic flow chart of the control method for the DC water pump used in the air source heat pump unit in the embodiment of the present invention.

[0040] Figure 4 This is a schematic flow chart of the control method for the DC canned motor pump in the embodiment of the present invention.

[0041] Figure 5 This is a schematic diagram of the modular structure of the control device for the DC water pump used in the air source heat pump unit in the embodiment of the present invention.

[0042] Reference numerals:

[0043] Outdoor unit 1; Hydraulic module 2; Water pump 3; Circulation water path 4; Floor heating module 51; Hot water tank 52; Preset module 61; Operation module 62; First acquisition module 63; Second acquisition module 64; Comparison module 65; Judgment module 66; Control module 67. Detailed implementation manners

[0044] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0045] As Figure 1 shown, in the embodiment of the present invention, the air source heat pump unit includes: an outdoor unit 1, a hydraulic module 2, a water pump 3, a circulation water path 4 and a user terminal 5. The outdoor unit 1 is connected to the hydraulic module 2 through an outlet pipe and a return pipe. After the hot water or cold water flowing out of the outdoor unit exchanges heat with the hydraulic module 2, it is pumped to the user terminal 5 through the water pump 3 and the inlet pipe of the circulation loop 4. The heated or cooled water flows back to the hydraulic module 2 through the outlet pipe of the circulation loop. The user terminal can be a floor heating module 51, a hot water tank 52, or an indoor unit, and the embodiment of the present invention does not limit this. In other embodiments, the air source heat pump unit can also be other forms of units, and the embodiment of the present invention does not limit this. Preferably, the water pump 3 is a DC water pump, more specifically a DC canned motor pump, and the DC canned motor pump has the advantages of high energy efficiency, stepless flow regulation, and low noise.

[0046] Assume that there are two manufacturers, A and B, that produce DC shielded pumps. The DC shielded pump of manufacturer A needs to be matched with the A' pump control program, and the DC shielded pump of manufacturer B needs to be matched with the B' pump control program. Under the same operating parameter conditions, the DC shielded pump of manufacturer A with the A' pump control program and the DC shielded pump of manufacturer B with the B' pump control program have exactly the same or basically the same effect on the whole machine, that is, in the above two states, the outlet water temperature and water volume of the air source heat pump unit are the same or basically the same.

[0047] like Figure 2 The figure shows the hydraulic performance curve of a DC water pump, i.e., the head-flow curve under different pump duty cycles. Different water pump manufacturers develop the same model of DC water pumps, and the head-flow curves under different pump duty cycles can be basically the same or basically consistent, but the head-flow curves under the same duty cycle can sometimes be quite different. When producing air source heat pumps, it is necessary to distinguish and use water pumps from different manufacturers, otherwise it is easy for the water pump to not match the whole machine controller.

[0048] Based on the above, we define the ambient temperature as T1, the theoretical water outlet temperature of the DC shielded pump of manufacturer A with the A' pump control program and the DC shielded pump of manufacturer B with the B' pump control program at T1 is T20, and the water outlet volume is Q2. Under the premise of a certain heating capacity of the whole machine, if the water outlet volume is small, then the water outlet temperature is relatively high, on the contrary, if the water outlet volume is large, then the water outlet temperature is relatively low. If the DC shielded pump model is matched incorrectly, the actual water outlet temperature will also differ greatly from the theoretical water outlet temperature, so the water outlet volume can be controlled to be the same and the water outlet temperature can be compared. In addition, the difference in ambient temperature, compressor frequency, and outdoor fan gear position will also affect the water outlet temperature. Therefore, when the ambient temperature, compressor frequency, outdoor fan gear position and water outlet volume are constant, for different models of DC shielded pumps, the actual water outlet temperature obtained when running at the same pump duty cycle is different. By comparing the actual water outlet temperature with the theoretical water outlet temperature, it can be determined whether the model or style of the DC shielded pump actually used matches the model or style of the matching DC shielded pump corresponding to the DC pump control program.

[0049] Specifically, Figure 3 As shown, the present invention provides a control method for a DC water pump of an air source heat pump unit, comprising the following steps:

[0050] Preset step: Preset multiple water pump control programs of the DC water pump of the air source heat pump unit to correspond to theoretical water outlet temperatures at different ambient temperatures;

[0051] Running steps: select one of the preset multiple water pump control programs as a test program, and drive the DC water pump to run according to the test program;

[0052] The first acquisition step: obtaining the current ambient temperature when the DC water pump is running to test the program and the actual outlet water temperature of the air source heat pump unit;

[0053] The second acquisition step: obtaining the theoretical water outlet temperature of the DC water pump corresponding to the test program and the current ambient temperature;

[0054] Comparison steps: compare the actual water outlet temperature with the theoretical water outlet temperature;

[0055] Judgment step: According to the comparison result of the actual outlet water temperature and the theoretical outlet water temperature, judge whether the matching DC water pump model corresponding to the test program matches the model of the DC water pump actually used;

[0056] Control steps: If the matched DC water pump model matches the model of the DC water pump actually in use, the DC water pump is controlled to run with a test program; if the matched DC water pump model does not match the model of the DC water pump actually in use, the execution module is controlled.

[0057] When the matching DC water pump model corresponding to the water pump control program matches the model of the DC water pump actually used, the actual water outlet temperature of the air source heat pump unit can be close to the theoretical water outlet temperature, and the operating efficiency of the air source heat pump unit is high; when the matching DC water pump model corresponding to the water pump control program does not match the model of the DC water pump actually used, the actual water outlet temperature of the air source heat pump unit may differ greatly from the theoretical water outlet temperature, and the operating efficiency of the air source heat pump unit is low. The control method of the present invention is actually a compatible water pump control program. Even if the DC water pump model actually used does not match the matching DC water pump model of the water pump control program, it can automatically identify and automatically correct errors, match the correct water pump control program, thereby ensuring the accuracy of the use of the DC water pump and the heating effect or reliability of the air source heat pump. In addition, the water outlet temperature is associated with the ambient temperature. When the ambient temperature is low, the water outlet temperature is also low. When the ambient temperature is high, the water outlet temperature is relatively high. By detecting the current ambient temperature and the actual water outlet temperature at the current ambient temperature and comparing it with the theoretical water outlet temperature at the corresponding ambient temperature, the accuracy of the comparison result is improved, thereby improving the accuracy of the judgment result. The method of the present invention can utilize the temperature detection device provided by the air source heat pump system to detect the outlet water temperature without adding any additional accessories, which is beneficial to saving manufacturing costs.

[0058] In a preferred embodiment of the present invention, the plurality of water pump control programs are the same water pump control program, and the water pump duty cycles of the plurality of water pump control programs are different.

[0059] The flow rates of the direct current water pumps produced by different manufacturers of direct current water pumps are different at the same duty cycle. Based on this, when other parameters are the same (for example, the compressor frequency, the ambient temperature, the outdoor fan gear, and the water output are constant), the outlet water temperatures corresponding to different water pump duty cycles are different. By controlling the air source heat pump unit to operate at the specified water pump duty cycle, the actual outlet water temperature of the air source heat pump unit at this water pump duty cycle can be obtained, and by comparing it with the theoretical outlet water temperature corresponding to this duty cycle, it can be known whether the model of the matching direct current water pump corresponding to this test program is consistent with the model of the actually operating direct current water pump, so that the air source heat pump unit and the direct current water pump can operate in a matching manner; in addition, by only controlling the air source heat pump unit to operate by controlling the water pump duty cycle and according to the comparison result of the actual outlet water temperature and the theoretical outlet water temperature, it can be judged whether the model of the actually used direct current water pump is correct. The method is simple and easy to operate, which is beneficial to improving the judgment and detection efficiency.

[0060] It should be noted that in the control step, when controlling the direct current water pump to operate according to the test program, it does not mean that the air source heat pump unit can only operate at this test program (water pump duty cycle). After selecting a matching direct current water pump, the water pump duty cycle can be continuously adjusted according to actual needs (such as setting the outlet water temperature) to generate different outlet water temperatures or water outputs to meet actual requirements.

[0061] In the preferred embodiment of the present invention, multiple water pump control programs can be set according to actual conditions. The number should not be too many to reduce unnecessary computing amount and save occupied space. For example, only two water pump control programs can be set.

[0062] In the preferred embodiment of the present invention, in the operation step, when the direct current water pump runs for the first time according to the test program, the air source heat pump unit is controlled to reach the temperature and not stop.

[0063] By the above method, when the set outlet water temperature of the air source heat pump unit is relatively low, the air source heat pump unit may reach the temperature and stop in the initial stage of operation. By controlling the air source heat pump unit not to reach the temperature and stop when the direct current water pump runs for the first time according to the test program, the smoothness of the operation of the direct current water pump control method can be improved, and the efficiency of the direct current water pump model selection judgment can be improved.

[0064] In the preferred embodiment of the present invention, in the first acquisition step, when the direct current water pump runs for the first time according to the test program, the current ambient temperature is first detected, and after the air source heat pump unit operates stably, the actual outlet water temperature is detected. By the above method, detecting the actual outlet water temperature after the unit operates stably is beneficial to improving the accuracy of the actual outlet water temperature detection result, and further improving the accuracy of the judgment result.

[0065] In a preferred embodiment of the present invention, in the judgment step, "judging whether the model of the direct current water pump under the test program matches the model of the direct current water pump according to the comparison result of the actual water outlet temperature and the theoretical water outlet temperature" includes: when the difference between the actual water outlet temperature and the theoretical water outlet temperature is within a specified numerical range, the test program matches the model of the direct current water pump.

[0066] In the above manner, when the difference between the actual water outlet temperature and the theoretical water outlet temperature is within the specified numerical range, it indicates that the difference between the actual water outlet temperature and the theoretical water outlet temperature is small, and the actual water outlet temperature is relatively close to the theoretical water outlet temperature. Therefore, the model of the direct current water pump is correctly matched.

[0067] In a preferred embodiment of the present invention, in the judgment step, "judging whether the model of the matching direct current water pump corresponding to the test program matches the model of the actually used direct current water pump according to the comparison result of the actual water outlet temperature and the theoretical water outlet temperature" includes: when the difference between the actual water outlet temperature and the theoretical water outlet temperature is not within the specified numerical range, the test program does not match the model of the direct current water pump.

[0068] In the above manner, when the difference between the actual water outlet temperature and the theoretical water outlet temperature is not within the specified numerical range, it indicates that the difference between the actual water outlet temperature and the theoretical water outlet temperature is large, and the model of the direct current water pump is not correctly matched.

[0069] In a preferred embodiment of the present invention, the air source heat pump unit at least includes a compressor and an outdoor fan, and the control method further includes: in the operation step, when the direct current water pump operates under the test program, the corresponding compressor frequency, outdoor fan operation gear and water output are constant; in the preset step, the theoretical water outlet temperature is obtained under specified experimental conditions, and the specified experimental conditions are the same compressor frequency, outdoor fan operation gear and water output as in the operation step.

[0070] In the above manner, in the operation step and the preset step, by controlling the compressor frequency, outdoor fan operation gear and water output to be constant and the same, the influence of different compressor frequencies, outdoor fan gears and water outputs on the water outlet temperature can be avoided, and the accuracy of the judgment result can be improved.

[0071] In a preferred embodiment of the present invention, the whole machine controller of the air source heat pump controls the water pump flow / water outlet temperature by adjusting the duty ratio of the water pump through PWM. The PWM method, also known as fixed frequency width modulation, means that the switching frequency remains constant, and the modulation purpose is achieved by changing the duty ratio of the drive signal in each cycle. The PWM method has the following advantages: the control circuit is simple, easy to design and implement, the output ripple voltage is small, the frequency characteristics are good, the linearity is high, and it has a relatively high efficiency under heavy load conditions. PWM is digital from the processor to the controlled system signal, and then digital-to-analog conversion is performed, which can minimize the influence of noise.

[0072] Embodiment:

[0073] In this embodiment, the outlet water temperature is used as an index to determine whether the model of the actually used DC canned motor pump matches the corresponding DC canned motor pump model specified in the water pump control program. Further, the outlet water temperature is associated with the ambient temperature, the compressor frequency, the operating gear of the outdoor fan, and the water output. To improve the measurement accuracy of the actual outlet water temperature T2 and the theoretical outlet water temperature T20, it is set that when the air source heat pump unit operates, it operates according to the following parameters: the compressor frequency is 80 Hz, the outdoor fan gear is the high gear, the duty ratio of the water pump in the test program is 5%, and the water output is Q2.

[0074] Specifically, as Figure 4 shown, the control method of the DC canned motor pump in the embodiment of the present invention includes:

[0075] There are preset A' water pump control program and B' water pump control program in the air source heat pump unit, and the theoretical outlet water temperatures corresponding to the A' water pump control program and B' water pump control program at different ambient temperatures are preset respectively;

[0076] When running fixed according to the A' water pump control program (test program), when the air source heat pump unit runs for the first time, the set outlet water temperature is ignored first. After the air source heat pump unit runs stably, the ambient temperature T1 and the actual outlet water temperature T2 are detected, and the actual outlet water temperature T2 is compared with the theoretical outlet water temperature T20 at the corresponding ambient temperature T1 (that is, when the ambient temperature is T1, the corresponding theoretical outlet water temperature value T20 is tested in the laboratory). If it is found that the difference between the actual outlet water temperature T2 and the theoretical outlet water temperature T20 is very large, that is, it is not within the specified range (such as ±1, ±2, etc., the size of the specified range can be adjusted according to the actual situation, and the principle is to be able to distinguish. The smaller the interval, the higher the requirement for detection accuracy, and the design cost may increase), then it is determined that the model of this DC water pump does not match; if it is found that the difference between the actual outlet water temperature and the theoretical outlet water temperature T20 is within the specified range, then it is determined that this DC canned motor pump matches, and the system runs fixed with the A' water pump control program;

[0077] Further, when the A' water pump control program does not match this DC canned motor pump, switch to the B' water pump control program (adjust the duty ratio of the water pump to change the water pump control program) to run. First, ignore the set outlet water temperature. After the air source heat pump unit runs stably, detect the ambient temperature T1 and the actual outlet water temperature T2. At this time, if the difference between the actual outlet water temperature T2 and the theoretical outlet water temperature T20 is within the specified range, then it is determined that the model of this DC canned motor pump matches, and the system runs fixed with this B' water pump control program. After determining this water pump control program, the air source heat pump unit runs normally according to this B' water pump control program according to the set outlet water temperature in the later stage.

[0078] It should be noted that if an air source heat pump unit uses three or more DC canned pumps, the above similar method can also be adopted for operation until the DC canned pump models match, so as to avoid the situation that the DC canned pump does not match the whole machine controller.

[0079] It should be noted that in the embodiments of the present invention, the air source heat pump unit is divided into an integral type and a split type. The integral air source heat pump unit is installed outdoors, and the ambient temperature refers to the outdoor ambient temperature; the split air source heat pump unit is installed indoors, and the ambient temperature refers to the indoor ambient temperature. In some embodiments, the return air temperature can also be used to replace the ambient temperature.

[0080] As Figure 5 shown, the present invention further provides a control device for a DC water pump of an air source heat pump unit, including:

[0081] A preset module 61 that presets the theoretical water outlet temperatures corresponding to multiple water pump control programs of the DC water pump of the air source heat pump unit at different ambient temperatures;

[0082] An operation module 62 that selects one of the preset multiple water pump control programs as a test program and drives the DC water pump to operate with the test program;

[0083] A first acquisition module 63 that is communicatively connected to the operation module 62. The first acquisition module is used to acquire the current ambient temperature and the actual water outlet temperature of the air source heat pump unit when the DC water pump operates with the test program;

[0084] A second acquisition module 64 that is communicatively connected to the preset module 61. The second acquisition module is used to acquire the theoretical water outlet temperature corresponding to the DC water pump under the test program and the current ambient temperature;

[0085] A comparison module 65 that is communicatively connected to the first acquisition module 63 and the second acquisition module 64. The comparison module 65 is used to compare the actual water outlet temperature and the theoretical water outlet temperature;

[0086] A judgment module 66 that judges whether the model of the matched DC water pump under the test program matches the model of the DC water pump according to the comparison result of the actual water outlet temperature and the theoretical water outlet temperature;

[0087] A control module 67 that is communicatively connected to the judgment module 66, the DC water pump, and the operation module 62. If the model of the matched DC water pump matches the model of the actually used DC water pump, the control module controls the DC water pump to operate with the test program; if the model of the matched DC water pump does not match the model of the actually used DC water pump, the control module controls the execution of the operation module 62.

[0088] Specifically, the first acquisition module 63 can be a temperature sensor or a flowmeter arranged at the hot water outlet of the air source heat pump unit, as well as an ambient temperature sensor for detecting the ambient temperature. The theoretical water outlet temperature data sets corresponding to different ambient temperatures are pre-stored in the main control board of the air source heat pump unit. The second acquisition module 64 calls the theoretical water outlet temperature data of different water pump control programs in the preset module 61 at different ambient temperatures. The control module 67 is preferably the main control board of the air source heat pump unit. The preset module 61, the operation module 62, the judgment module 66, and the comparison module 65 are integrated on the main control board, which improves the integration degree of the main control board and saves the occupied space. Further, the main control board can be the overall controller of the air source heat pump unit, specifically, it can be an integrated circuit chip with the ability to process signals. The above control module can be a general-purpose processor, including a Central Processing Unit (CPU), and can also be a single-chip microcomputer, a Microcontroller Unit (MCU), a Complex Programmable Logic Device (CPLD), a Field-Programmable Gate Array (FPGA), an Application Specific Integrated Circuit (ASIC), an embedded ARM, etc. The chip, the control module 67 can implement or execute the various methods, steps, and logic block diagrams disclosed in the embodiments of the present invention.

[0089] The control device for the DC canned motor pump of the air source heat pump unit of the present invention can automatically identify and correct errors even when there is a mismatch between the DC canned motor pump and the overall controller, so that the model of the water pump control program matches the model of the actually used DC canned motor pump, thereby ensuring the heating effect of the air source heat pump or the reliability of the unit operation.

[0090] The present invention further provides an air source heat pump unit, including a control device for the DC water pump of the air source heat pump unit, and the control device executes the above control method for the DC water pump of the air source heat pump unit.

[0091] The present invention further provides a computer-readable storage medium storing a computer program, and when the computer program is executed by a processor, it realizes the steps of the control method for the DC canned motor pump of the air source heat pump unit as described above. Specifically, the computer-readable storage medium is a memory.

[0092] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A control method for a direct current pump of an air source heat pump unit, characterized in that, it includes the following steps: Presetting step: Presetting the theoretical outlet water temperature corresponding to multiple pump control programs of the direct current pump of the air source heat pump unit at different ambient temperatures; Operating step: Selecting one of the preset multiple pump control programs as a test program, and driving the direct current pump to operate with the test program; First acquisition step: Acquiring the current ambient temperature when the direct current pump operates with the test program and the actual outlet water temperature of the air source heat pump unit; Second acquisition step: Acquiring the theoretical outlet water temperature corresponding to the direct current pump under the test program and the current ambient temperature; Comparison step: Comparing the actual outlet water temperature and the theoretical outlet water temperature; Judgment step: Judging whether the model of the matching direct current pump corresponding to the test program matches the model of the actually used direct current pump according to the comparison result of the actual outlet water temperature and the theoretical outlet water temperature; Control step: If the model of the matching direct current pump matches the model of the actually used direct current pump, controlling the direct current pump to operate with the test program; if the model of the matching direct current pump does not match the model of the actually used direct current pump, controlling to execute the operating step.

2. The control method for a direct current pump of an air source heat pump unit according to claim 1, characterized in that, the multiple pump control programs are the same pump control program, and the pump duty cycles of the multiple pump control programs are different.

3. The control method for a direct current pump of an air source heat pump unit according to claim 2, characterized in that, in the operating step, when the direct current pump operates with the test program for the first time, controlling the air source heat pump unit to reach the temperature without stopping.

4. The control method for a direct current pump of an air source heat pump unit according to claim 2, characterized in that, in the first acquisition step, when the direct current pump operates with the test program for the first time, first detecting the current ambient temperature, and after the air source heat pump unit operates stably, detecting the actual outlet water temperature.

5. The control method for a direct current pump of an air source heat pump unit according to any one of claims 1 to 4, characterized in that, in the judgment step, the "judging whether the model of the matching direct current pump corresponding to the test program matches the model of the actually used direct current pump according to the comparison result of the actual outlet water temperature and the theoretical outlet water temperature" includes: when the difference between the actual outlet water temperature and the theoretical outlet water temperature is within a specified numerical range, the model of the matching direct current pump matches the model of the actually used direct current pump.

6. The control method for a direct current pump of an air source heat pump unit according to any one of claims 1 to 4, characterized in that, in the judgment step, the "judging whether the model of the matching direct current pump corresponding to the test program matches the model of the actually used direct current pump according to the comparison result of the actual outlet water temperature and the theoretical outlet water temperature" includes: When the difference between the actual water outlet temperature and the theoretical water outlet temperature is not within the specified numerical range, the model of the matched DC water pump does not match the model of the actually used DC water pump.

7. The control method for the DC water pump of the air source heat pump unit according to any one of claims 1 to 4, wherein the air source heat pump unit at least includes a compressor and an outdoor fan. Characterized in that The control method further includes: in the operation step, when the DC water pump operates under the test program, the corresponding compressor frequency, the operation gear of the outdoor fan and the water output are constant; in the preset step, the theoretical water outlet temperature is obtained under specified experimental conditions, and the specified experimental conditions are the same compressor frequency, the operation gear of the outdoor fan and the water output as those in the operation step.

8. A control device for the DC water pump of the air source heat pump unit. Characterized in that It includes: A preset module that presets the theoretical water outlet temperature corresponding to multiple water pump control programs of the DC water pump of the air source heat pump unit at different ambient temperatures; An operation module that selects one of the preset multiple water pump control programs as the test program and drives the DC water pump to operate with the test program; A first acquisition module that is communicatively connected to the operation module, and the first acquisition module is used to acquire the current ambient temperature and the actual water outlet temperature of the air source heat pump unit when the DC water pump operates with the test program; A second acquisition module that is communicatively connected to the preset module, and the second acquisition module is used to acquire the theoretical water outlet temperature corresponding to the DC water pump under the test program and the current ambient temperature; A comparison module that is communicatively connected to the first acquisition module and the second acquisition module, and the comparison module is used to compare the actual water outlet temperature and the theoretical water outlet temperature; A judgment module that judges whether the model of the matched DC water pump under the test program matches the model of the DC water pump according to the comparison result of the actual water outlet temperature and the theoretical water outlet temperature; A control module that is communicatively connected to the judgment module, the DC water pump and the operation module. If the model of the matched DC water pump matches the model of the actually used DC water pump, the control module controls the DC water pump to operate with the test program; if the model of the matched DC water pump does not match the model of the actually used DC water pump, the control module controls the execution of the operation module.

9. An air source heat pump unit. Characterized in that It includes a control device for the DC water pump of the air source heat pump unit, and the control device executes the control method for the DC water pump of the air source heat pump unit according to any one of claims 1 to 7.

10. A computer-readable storage medium. Characterized in that It stores a computer program, and when the computer program is executed by a processor, it realizes the steps of the control method for the DC water pump of the air source heat pump unit according to any one of claims 1 to 7.

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