CN110425747B - Variable-frequency water pump control method suitable for variable-frequency heat pump water heater - Google Patents
Variable-frequency water pump control method suitable for variable-frequency heat pump water heater Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
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Abstract
The invention discloses a variable frequency water pump control method suitable for a variable frequency heat pump water heater, which specifically comprises the following steps: and starting a dynamic monitoring mode during the stable operation of the heat pump water heater, and monitoring the inlet water temperature T1, the outlet water temperature T2 and the water flow Q at the water side heat exchanger in real time in the dynamic monitoring mode, wherein only when the water flow Q monitored in real time is greater than a preset minimum water flow Qmin, the absolute value | Δ T | of the temperature difference between the inlet water temperature T1 and the outlet water temperature T2 is calculated and determined, so that the absolute value | Δ T | of the temperature difference determined by real time calculation is compared with an upshift temperature value Ta and a downshift temperature value Tb of a current capacity gear of the variable frequency water pump, and then the capacity gear of the variable frequency water pump is correspondingly adjusted based on the judgment result.
Description
Technical Field
The invention relates to the technical field of air conditioning systems, in particular to a variable frequency water pump control method suitable for a variable frequency heat pump water heater.
Background
Many heat pump water heaters with frequency conversion functions in the market at present are basically matched with water pumps which can only be adjusted manually, and because of appearance reasons, the water pumps are usually installed in outdoor units or indoor units, and after one adjustment, the corresponding adjustment is difficult to be made again according to the capacity of the heat pump. Moreover, the water flow parameter is an extremely important parameter in the operation of the heat pump, and the following problems are easily caused in the operation of the heat pump due to improper adjustment:
1) when the heat pump operates in a refrigeration mode, the heat pump is easy to freeze due to too little water flow, and the heat exchanger is blocked or even frozen;
2) if the water flow of the heat pump is too large, the temperature difference between the inlet water and the outlet water of the heat pump is reduced. Under the same outlet water temperature, the smaller the inlet and outlet water temperature difference will result in the smaller average heat exchange temperature difference between the refrigerant and the water, making the energy efficiency of the heat pump worse.
Therefore, the variable frequency water pump is applied to the variable frequency heat pump water heater, the water flow of the pipeline can be automatically adjusted according to the load characteristics of the heat pump water heater, the energy efficiency of the heat pump water heater is improved, and the noise of the pipeline is reduced.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a variable frequency water pump control method suitable for a variable frequency heat pump water heater.
In order to achieve the above object, the present invention provides a method for controlling a variable frequency water pump suitable for a variable frequency heat pump water heater, which includes a water side heat exchanger and a variable frequency water pump communicated with the water side heat exchanger and a heating end, and the variable frequency water pump is divided into a plurality of stages of capacity gears in advance according to output capacity, wherein each stage of capacity gear is provided with an upshift temperature value and a downshift temperature value, and the method specifically includes the following steps:
and starting a dynamic monitoring mode during the stable operation of the heat pump water heater, and monitoring the inlet water temperature T1, the outlet water temperature T2 and the water flow Q at the water side heat exchanger in real time in the dynamic monitoring mode, wherein only when the water flow Q monitored in real time is greater than a preset minimum water flow Qmin, the absolute value | Δ T | of the temperature difference between the inlet water temperature T1 and the outlet water temperature T2 is calculated and determined, so that the absolute value | Δ T | of the temperature difference determined by real time calculation is compared with an upshift temperature value Ta and a downshift temperature value Tb of a current capacity gear of the variable frequency water pump, and then the capacity gear of the variable frequency water pump is correspondingly adjusted based on the judgment result.
The method for controlling the variable-frequency water pump applicable to the variable-frequency heat pump water heater according to claim 1, characterized in that: and during the stable operation of the heat pump water heater, if the monitored water flow Q is less than or equal to the minimum water flow Qmin, exiting the dynamic monitoring mode, and then enabling the variable frequency water pump to adjust the capacity gear of one stage upwards and limit the capacity gear to adjust downwards on the basis of the current capacity gear.
Further, during the stable operation of the heat pump water heater, once the absolute value of the temperature difference | Δ T | is greater than or equal to the preset maximum temperature difference | Δ T | max, the dynamic monitoring mode is exited, and then the variable frequency water pump is enabled to adjust the capacity gear up and limit the capacity gear down based on the current capacity gear.
Further, after the variable frequency water pump is shifted up to a first-level capacity gear, the water flow Q is continuously monitored in a preset monitoring time period T4, wherein if the water flow Q is smaller than or equal to the minimum water flow Qmin again, the gear of the variable frequency water pump is restored to the default gear, and the dynamic monitoring mode is restarted after the variable frequency water pump is continuously operated in the default capacity gear for a preset resetting time period T5.
Further, after the variable frequency water pump is shifted up to a first-level capacity gear, the inlet water temperature T1 and the outlet water temperature T2 are continuously monitored in a preset monitoring time period T4, the absolute value | Δ T | of the temperature difference is calculated in real time, if the absolute value | Δ T | of the temperature difference is larger than or equal to the maximum temperature value | Δ T | max again, the gear of the variable frequency water pump is restored to the default gear, the variable frequency water pump is continuously operated for a preset resetting time period T5 according to the default capacity gear, and then the dynamic monitoring mode is restarted.
Further, when the heat pump water heater is just started, the variable frequency water pump firstly operates in a default capacity gear for a preset initial time period t1, then the water flow Q and the compressor frequency F of the compressor are monitored and judged, wherein when the water flow Q is larger than a preset minimum water flow Qmin and the compressor frequency F is larger than or equal to a preset default frequency, the heat pump water heater at the moment is determined to be in stable operation, and then a dynamic monitoring mode is started.
Further, in the dynamic monitoring mode, when the absolute value of the temperature difference | Δ T | is greater than the upshift temperature value Ta of the current capacity gear of the variable frequency water pump, the variable frequency water pump adjusts the capacity gear by one level based on the current capacity gear, and after the adjusted capacity gear continuously operates for a predetermined adjustment time period T2, the variable frequency water pump recalculates and determines a new absolute value of the temperature difference | Δ T | according to the intake water temperature T1 and the outlet water temperature T2 monitored in real time, and then the new absolute value of the temperature difference | Δ T | is compared and determined with the upshift temperature value Ta corresponding to the adjusted capacity gear, wherein when the new absolute value of the temperature difference | Δ T | is still greater than the corresponding upshift temperature value Ta, the one-level capacity gear continues to be adjusted, and the above-mentioned steps are repeated in such a cycle until the absolute value of the temperature difference | Δ T | is not greater than the corresponding upshift temperature value Ta or the variable frequency water pump reaches the maximum capacity gear, the capacity gear of the variable frequency water pump is not adjusted up any more.
Further, in the dynamic monitoring mode, when the absolute value of the temperature difference | Δ T | is smaller than the downshift temperature Tb of the current capability gear of the variable frequency water pump, the variable frequency water pump down-adjusts the first capability gear based on the current capability gear, and continuously operates for a predetermined adjustment time period T2 with the down-adjusted capability gear, and then recalculates and determines a new absolute value of the temperature difference | Δ T | according to the intake water temperature T1 and the outlet water temperature T2 monitored in real time, and then compares and determines the new absolute value of the temperature difference | Δ T | with the downshift temperature Tb corresponding to the down-adjusted capability gear, wherein when the new absolute value of the temperature difference | Δ T | is still smaller than the corresponding downshift temperature Tb, the first capability gear is continuously down-adjusted, and the above cycle is repeated until the absolute value of the temperature difference | Δ T | is not smaller than the corresponding downshift temperature Tb or the variable frequency water pump reaches the minimum capability gear, the capacity gear of the variable frequency water pump is not adjusted downwards.
Further, in the dynamic monitoring mode, when the absolute value of the temperature difference | Δ T | is between an upshift temperature value Ta and a downshift temperature value Tb of the current capacity gear of the variable frequency water pump, the variable frequency level keeps the current capacity gear to continuously operate.
Furthermore, each level of capacity gear is correspondingly set with a press frequency, wherein after the variable frequency water pump adjusts the capacity gear, the compressor is correspondingly adjusted to the press frequency corresponding to the current capacity gear.
The invention adopts the scheme, and has the beneficial effects that: (1) the energy efficiency of the heat pump water heater is improved, and the capacity of the heat pump water heater is fully exerted; (2) the noise of the pipeline due to overlarge water flow is reduced, and the comfort is improved; (3) the energy consumption required by the water pump can be further reduced; (4) and the reliable operation of the heat pump water heater is ensured.
Drawings
FIG. 1 is a schematic diagram illustrating the determination of the absolute value of the temperature difference according to the embodiment.
Fig. 2 is a schematic structural diagram of the heat pump water heater according to the embodiment.
Detailed Description
In order to facilitate understanding of the present invention, the present invention will be described more fully with reference to the accompanying drawings. The preferred embodiments of the present invention are shown in the drawings. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. These embodiments are provided so that this disclosure will be thorough and complete.
Referring to fig. 2, in this embodiment, a water heater suitable for a variable frequency heat pump includes an outdoor heat exchanger 1, a water side heat exchanger 2, a compressor 3, a variable frequency water pump 4, a flow meter 5, an outlet temperature sensing probe 6, and an inlet temperature sensing probe 7, where a refrigerant flow path of the water side heat exchanger 2 is communicated with the outdoor heat exchanger 1 and the compressor 3, a water conservancy flow path of the water side heat exchanger 2 is communicated with the variable frequency water pump 4 and a heating terminal, the outlet temperature sensing probe 6 and the inlet temperature sensing probe 7 are respectively located at a water outlet and a water inlet of the water side heat exchanger 2, and the flow meter 5 is located between the water outlet and the heating terminal of the water side.
In this embodiment, the water inlet temperature sensing probe 7 is used for monitoring and obtaining the water inlet temperature T1 of the water side heat exchanger 2 in real time; the water outlet temperature sensing probe 6 is used for monitoring the water outlet temperature T2 of the water side heat exchanger 2 in real time; the flowmeter 5 is used for monitoring and obtaining the water flow Q in real time.
The control method of the variable frequency water pump is explained by combining the variable frequency heat pump water heater.
Referring to fig. 1, according to the method for controlling a variable frequency water pump suitable for a variable frequency heat pump water heater in this embodiment, a variable frequency water pump is divided into a plurality of stages of capacity gears according to the output capacity in an increasing manner according to the actual type of the heat pump water heater, wherein the nth gear is the highest gear, and the output capacity of the variable frequency water pump is the best; the 1 st gear is the lowest gear, and the output capacity of the variable frequency water pump is the lowest. An upshift temperature value Ta and a downshift temperature value Tb are predefined for each gear capacity, wherein the upshift temperature value Ta is greater than the downshift temperature value Tb.
When the heat pump water heater is just started, all elements are in an initial state, therefore, after the variable frequency water pump at the moment operates for a preset initial time period t1 at a default capacity gear, the water flow Q and the compressor frequency F of the compressor are monitored and judged, wherein when the water flow Q is larger than a preset minimum water flow Qmin (Q is larger than Qmin) and the compressor frequency F is larger than or equal to a preset default frequency (F is larger than or equal to the default frequency), the heat pump water heater at the moment is determined to be in a stable operation state, and then a dynamic monitoring mode is started. On the contrary, when the water flow Q is less than or equal to the predetermined minimum water flow Qmin (Q is less than or equal to Qmin) and the compressor frequency F is less than the predetermined default frequency (F is less than the default frequency), the heat pump water heater at this time is determined to be in the unstable operation state, so that the heat pump water heater continuously operates for an initial time period t1, the water flow Q and the compressor frequency F of the compressor are monitored and determined again, if the heat pump water heater is still in the unstable operation state, the heat pump water heater is in a fault, and then an alarm message is sent or the operation is terminated according to a predetermined fault processing program, wherein the fault processing program can be adaptively set according to the actual type of the heat pump water heater, and the method.
And starting a dynamic monitoring mode during the stable operation of the heat pump water heater, and monitoring the inlet water temperature T1, the outlet water temperature T2 and the water flow Q of the water side heat exchanger 2 in real time in the dynamic monitoring mode, wherein only when the water flow Q monitored in real time is greater than a preset minimum water flow Qmin (Q is greater than Qmin), the absolute value | Δ T | of the temperature difference between the inlet water temperature T1 and the outlet water temperature T2 is calculated and determined, and thus the absolute value | Δ T | calculated and determined in real time is compared with the upshift temperature value Ta and the downshift temperature value Tb of the current capacity gear of the variable frequency water pump, namely, during the operation of the heat pump water heater, whether the water flow Q is in the stable operation state is detected and determined, and the output capacity of the variable frequency water pump is adjusted only under the stable operation state of the heat pump water heater. Therefore, in the dynamic monitoring mode, based on the absolute value | Δ T | (that is, | Δ T | = | T1-T2 |) of the temperature difference between the inlet water temperature T1 and the outlet water temperature T2, the comparison determination is made with the upshift temperature value Ta and the downshift temperature value Tb of the current capacity gear of the variable frequency water pump, so that the capacity gear of the variable frequency water pump is correspondingly adjusted based on the determination result, and for convenience of understanding, the following three cases of the determination result are respectively explained.
The first condition is as follows: when the absolute value of the temperature difference | Δ T | is greater than the upshift temperature value Ta of the current capacity gear of the variable frequency water pump, that is, | Δ T | > the current upshift temperature value Ta, it indicates that the increase in the demand of the terminal device results in insufficient output capacity of the variable frequency water pump at that time and a decrease in the water flow Q, and the output capacity of the variable frequency water pump needs to be increased, so that the variable frequency water pump adjusts the capacity gear of one level on the basis of the current capacity gear and continuously operates for a predetermined adjustment time period T2 at the adjusted capacity gear, it is ensured that the heat pump water heater obtains enough time to perform adjustment transition, and subsequent detection parameters can be accurately obtained.
In addition, after the heat pump water heater operates for the adjustment time period T2, a new temperature difference absolute value | Δ T | is recalculated and determined according to the inlet water temperature T1 and the outlet water temperature T2 monitored in real time, and then the new temperature difference absolute value | Δ T | is compared and determined with the upshift temperature value Ta corresponding to the adjusted up capacity gear, wherein if the new temperature difference absolute value | Δ T | is still larger than the corresponding upshift temperature value Ta, the first-level capacity gear is continuously adjusted up, and the cycle is repeated until the temperature difference absolute value | Δ T | is not larger than the corresponding upshift temperature value Ta (that is, | Δ T | is not larger than the upshift temperature value Ta) or the variable frequency water pump reaches the maximum capacity gear, the capacity gear of the variable frequency water pump is not adjusted up.
Case two: when the absolute value | Δ T | of the temperature difference is smaller than a downshift temperature value Tb of a current capability gear of the variable frequency water pump, that is, | Δ T | < the current downshift temperature value Tb, it indicates that a decrease in demand of the terminal device results in an excess of output capability of the variable frequency water pump at that time and an increase in water flow Q, and the output capability of the variable frequency water pump needs to be decreased.
In addition, after the heat pump water heater operates for the adjustment time period T2, a new temperature difference absolute value | Δ T | is recalculated and determined according to the water inlet temperature T1 and the water outlet temperature T2 monitored in real time, and then the new temperature difference absolute value | Δ T | is compared and determined with a downshift temperature value Tb corresponding to the power gear after being adjusted down, wherein if the new temperature difference absolute value | Δ T | is still smaller than the corresponding downshift temperature value Tb, the power gear is continuously adjusted down by one step, and the above cycle is repeated until the temperature difference absolute value | Δ T | is not smaller than the corresponding downshift temperature value Tb (| Δ T | ≧ downshift temperature value Tb) or the variable frequency water pump reaches the minimum power gear, and then the power gear of the variable frequency water pump is not adjusted down.
Case three: in the dynamic monitoring mode, when the absolute value of the temperature difference | Δ T | is between an upshift temperature value Ta and a downshift temperature value Tb of a current capacity gear of the variable frequency water pump, that is, the current downshift temperature value Tb is less than or equal to | Δ T |, and is less than or equal to the current upshift temperature value Ta, the demand of the terminal equipment at the moment is represented to correspond to the output capacity of the variable frequency water pump at the moment, the output capacity of the variable frequency water pump does not need to be adjusted, and therefore, the variable frequency level keeps the current capacity gear to continuously operate.
Through the three conditions listed above to judge according to comparing with the upshift temperature value Ta and the downshift temperature value Tb of current ability gear according to difference in temperature absolute value | delta T | to the realization carries out dynamic adjustment to the ability gear of frequency conversion water pump, under the prerequisite of the demand that satisfies end equipment, selects the most energy-conserving output mode for use automatically.
In this embodiment, during the dynamic monitoring mode, if the monitored water flow Q is less than or equal to the minimum water flow Qmin (Q is less than or equal to Qmin), this time indicates that the water yield of the variable frequency water pump is insufficient at the current capacity stage, and the output capacity needs to be improved, so the heat pump water heater exits the dynamic monitoring mode, and then the variable frequency water pump is enabled to adjust the capacity stage of one stage up and limit the capacity stage down based on the current capacity stage. In addition, after the variable frequency water pump is shifted up to a first-level capacity gear, the water flow Q is continuously monitored in a preset monitoring time period T4, wherein if the water flow Q is smaller than or equal to the minimum water flow Qmin (Q is less than or equal to Qmin) again, the gear of the variable frequency water pump is restored to the default gear, and the dynamic monitoring mode is restarted after the variable frequency water pump is continuously operated for a preset resetting time period T5 in the default capacity gear, so that the output capacity of the variable frequency water pump is reset, and then the output capacity of the variable frequency water pump is re-adjusted by the default gear.
In this embodiment, each level of capacity gear is correspondingly set with a compressor frequency, wherein after the capacity gear is adjusted by the variable frequency water pump, the compressor is correspondingly adjusted to the compressor frequency corresponding to the current capacity gear.
In addition, in order to further ensure the stable operation of the heat pump water heater, a maximum temperature difference value | Δ T | max is set for comparison and judgment of a temperature difference absolute value | Δ T | determined by real-time calculation, namely, during the stable operation of the heat pump water heater, once the temperature difference absolute value | Δ T | is greater than or equal to a preset maximum temperature difference value | Δ T | max (| Δ T | ≧ Δ T | max), the dynamic monitoring mode is exited, and then the variable frequency water pump is enabled to adjust the first-level capacity gear and limit the capacity gear to be adjusted downwards on the basis of the current capacity gear. In addition, after the variable frequency water pump is shifted up to a first-level capacity gear, the inlet water temperature T1 and the outlet water temperature T2 are continuously monitored in a preset monitoring time period T4, the absolute value | Δ T | of the temperature difference is calculated in real time, if the absolute value | Δ T | of the temperature difference is larger than or equal to the maximum temperature value | Δ T | max again, the gear of the variable frequency water pump is restored to the default gear, and the dynamic monitoring mode is restarted after the variable frequency water pump is continuously operated for a preset resetting time period T5 according to the default capacity gear. In this way, the output capacity of the variable-frequency water pump is reset, and then the output capacity is adjusted again by the default gear.
In conclusion, whether the Q is less than or equal to Qmin or the | Delta T | is more than or equal to the | Delta T | max is monitored during the stable operation of the heat pump water heater, so that the output gear of the variable frequency water pump can be adjusted in time, and the stable and reliable operation of the heat pump water heater is ensured.
Further, for easy understanding, the control method specifically includes the following steps:
s1, when a heat pump water heater is just started, a variable frequency water pump firstly operates in a default capacity gear for a preset first time period T1, and then the water inlet temperature T1, the water outlet temperature T2 and the water flow Q of a water side heat exchanger 2 are monitored in real time;
s2, judging whether the water flow Q is larger than a preset minimum water flow Qmin in real time, wherein only when the water flow Q is larger than the minimum water flow Qmin, calculating and confirming an absolute value | delta T | of a temperature difference between an inlet water temperature T1 and an outlet water temperature T2;
and S3, comparing and judging according to an upshift temperature value and a downshift temperature value corresponding to the current capacity gear of the variable frequency water pump and the absolute value | delta T | of the current temperature difference, and accordingly performing up-regulation or down-regulation on the capacity gear of the variable frequency water pump.
The above-described embodiments are merely preferred embodiments of the present invention, which is not intended to limit the present invention in any way. Those skilled in the art can make many changes, modifications, and equivalents to the embodiments of the invention without departing from the scope of the invention as set forth in the claims below. Therefore, equivalent changes made according to the spirit of the present invention should be covered within the protection scope of the present invention without departing from the contents of the technical scheme of the present invention.
Claims (8)
1. The utility model provides a frequency conversion water pump control method suitable for frequency conversion heat pump water heater, includes water side heat exchanger and with the water side heat exchanger and the terminal frequency conversion water pump that communicates of heating, its characterized in that: the control method comprises the following steps of:
starting a dynamic monitoring mode during the stable operation of the heat pump water heater, and monitoring the inlet water temperature T1, the outlet water temperature T2 and the water flow Q at the water side heat exchanger in real time in the dynamic monitoring mode, wherein only when the water flow Q monitored in real time is greater than a preset minimum water flow Qmin, the absolute value | Δ T | of the temperature difference between the inlet water temperature T1 and the outlet water temperature T2 is calculated and determined, so that the absolute value | Δ T | of the temperature difference determined by real time calculation is compared with an upshift temperature value Ta and a downshift temperature value Tb of a current capacity gear of the variable frequency water pump, and then the capacity gear of the variable frequency water pump is correspondingly adjusted based on the judgment result;
in the dynamic monitoring mode, when the absolute value of the temperature difference | Δ T | is greater than the upshift temperature value Ta of the current capacity gear of the variable frequency water pump, the variable frequency water pump adjusts the first-level capacity gear based on the current capacity gear, and after the adjusted capacity gear continuously operates for a preset adjustment time period T2, the variable frequency water pump recalculates to determine a new absolute value of the temperature difference | Δ T | according to the intake temperature T1 and the output temperature T2 monitored in real time, and then the new absolute value of the temperature difference | Δ T | is compared and judged with the upshift temperature value Ta corresponding to the adjusted capacity gear, wherein when the new absolute value of the temperature difference | Δ T | is still greater than the corresponding upshift temperature value Ta, the first-level capacity gear continues to be adjusted, and the cycle is repeated until the absolute value of the temperature difference | Δ T | is not greater than the corresponding upshift temperature value Ta or the variable frequency water pump reaches the maximum capacity gear, the capacity gear of the variable-frequency water pump is not adjusted upwards;
in the dynamic monitoring mode, when the absolute value | Δ T | of the temperature difference is smaller than a downshift temperature Tb of a current capability gear of the variable frequency water pump, the variable frequency water pump down-adjusts the first capability gear based on the current capability gear, and continuously operates for a predetermined adjustment time period T2 with the down-adjusted capability gear, and then recalculates and determines a new absolute value | Δ T | according to the intake water temperature T1 and the outlet water temperature T2 monitored in real time, and then compares and determines the new absolute value | Δ T | with a downshift temperature Tb corresponding to the down-adjusted capability gear, wherein when the new absolute value | Δ T | is still smaller than the corresponding downshift temperature Tb, the one-level capability gear is continuously down-adjusted, and the above-mentioned steps are repeated in a cyclic manner until the absolute value | Δ T | is not smaller than the corresponding downshift temperature Tb or the variable frequency water pump reaches a minimum capability gear, the capacity gear of the variable frequency water pump is not adjusted downwards.
2. The method for controlling the variable-frequency water pump applicable to the variable-frequency heat pump water heater according to claim 1, characterized in that: and during the stable operation of the heat pump water heater, if the monitored water flow Q is less than or equal to the minimum water flow Qmin, exiting the dynamic monitoring mode, and then enabling the variable frequency water pump to adjust the capacity gear of one stage upwards and limit the capacity gear to adjust downwards on the basis of the current capacity gear.
3. The method for controlling the variable-frequency water pump applicable to the variable-frequency heat pump water heater according to claim 1, characterized in that: during the stable operation of the heat pump water heater, once the absolute value of the temperature difference | delta T | is greater than or equal to the preset maximum temperature difference | delta T | max, the dynamic monitoring mode is exited, and then the variable frequency water pump is enabled to adjust the capacity gear of one stage upwards and limit the capacity gear to adjust downwards on the basis of the current capacity gear.
4. The method for controlling the variable-frequency water pump applicable to the variable-frequency heat pump water heater according to claim 2, characterized in that: after the variable frequency water pump is shifted up to a first-level capacity gear, the water flow Q is continuously monitored in a preset monitoring time period T4, wherein if the water flow Q is smaller than or equal to the minimum water flow Qmin again, the gear of the variable frequency water pump is restored to the default gear, and the dynamic monitoring mode is restarted after the variable frequency water pump is continuously operated in the default capacity gear for a preset resetting time period T5.
5. The method for controlling the variable-frequency water pump applicable to the variable-frequency heat pump water heater according to claim 3, wherein the method comprises the following steps: after the variable frequency water pump is shifted up to a first-level capacity gear, the inlet water temperature T1 and the outlet water temperature T2 are continuously monitored in a preset monitoring time period T4, the absolute value | Δ T | of the temperature difference is calculated in real time, if the absolute value | Δ T | of the temperature difference is larger than or equal to the maximum temperature value | Δ T | max again, the gear of the variable frequency water pump is restored to the default gear, the variable frequency water pump is continuously operated for a preset resetting time period T5 according to the default capacity gear, and then the dynamic monitoring mode is restarted.
6. The method for controlling the variable-frequency water pump applicable to the variable-frequency heat pump water heater according to claim 1, characterized in that: when the heat pump water heater is just started, the variable frequency water pump firstly operates in a default capacity gear for a preset initial time period t1, then the water flow Q and the compressor frequency F of the compressor are monitored and judged, wherein when the water flow Q is larger than a preset minimum water flow Qmin and the compressor frequency F is larger than or equal to a preset default frequency, the heat pump water heater at the moment is determined to be in stable operation, and then a dynamic monitoring mode is started.
7. The method for controlling the variable-frequency water pump applicable to the variable-frequency heat pump water heater according to claim 6, wherein the method comprises the following steps: in the dynamic monitoring mode, when the absolute value of the temperature difference | Δ T | is between an upshift temperature value Ta and a downshift temperature value Tb of the current capacity gear of the variable frequency water pump, the variable frequency level keeps the current capacity gear to continuously operate.
8. The method for controlling the variable-frequency water pump applicable to the variable-frequency heat pump water heater according to claim 1, characterized in that: and each level of capacity gear is correspondingly set with a press frequency, wherein after the variable frequency water pump adjusts the capacity gear, the compressor is correspondingly adjusted to the press frequency corresponding to the current capacity gear.
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| CN111059767B (en) * | 2019-11-29 | 2022-06-14 | 青岛经济技术开发区海尔热水器有限公司 | Control method of gas water heater and gas water heater |
| CN111120284B (en) * | 2019-12-26 | 2021-04-27 | 珠海格力电器股份有限公司 | Heat pump system and water pump control method thereof |
| CN111623526B (en) * | 2020-04-26 | 2021-08-24 | 青岛海信日立空调***有限公司 | Flow control method and device of water heater and water heater |
| CN111707031B (en) * | 2020-05-25 | 2021-06-11 | 广东纽恩泰新能源科技发展有限公司 | Heat pump unit starting control method and system |
| CN113606782B (en) * | 2021-07-30 | 2022-10-28 | 宁波奥克斯电气股份有限公司 | Variable frequency control method and device of heat pump unit, storage medium and heat pump unit |
| CN113970125A (en) * | 2021-10-26 | 2022-01-25 | 珠海格力电器股份有限公司 | Water outlet temperature regulation and control method and device, heat pump system and heating equipment |
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