CN110849034B

CN110849034B - Control method and device for heat pump system, heat pump system and storage medium

Info

Publication number: CN110849034B
Application number: CN201911211247.7A
Authority: CN
Inventors: 马剑; 骆名文; 张光鹏
Original assignee: Midea Group Co Ltd; GD Midea Heating and Ventilating Equipment Co Ltd
Current assignee: Midea Group Co Ltd; GD Midea Heating and Ventilating Equipment Co Ltd
Priority date: 2019-12-02
Filing date: 2019-12-02
Publication date: 2022-04-15
Anticipated expiration: 2039-12-02
Also published as: CN110849034A

Abstract

The invention provides a control method and device of a heat pump system, the heat pump system and a storage medium. The heat pump system comprises a water pump, and the control method of the heat pump system comprises the following steps: determining that a water pump is in an operating state, acquiring a first water inlet temperature of a heat pump system and acquiring a first moment of the first water inlet temperature; controlling the water pump to stop and start again to obtain a second water inlet temperature of the heat pump system and a second moment for collecting the second water inlet temperature; the running state of the water pump is controlled according to the first water inlet temperature, the first moment, the second water inlet temperature and the second moment, and the running state of the water pump is controlled by the water inlet temperature of the previous shutdown, so that the water pump cannot be in a running state all the time, and the power consumption of the water pump is reduced.

Description

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

Technical Field

The invention relates to the technical field of heat pump control, in particular to a control method of a heat pump system, a control device of the heat pump system, the heat pump system and a computer readable storage medium.

Background

In the related technical scheme, a water pump of the heat pump system is in a running state all the time, the power consumption of the water pump is high, and the energy-saving requirement at the current stage cannot be met, so that the problem of how to reduce the power consumption of the water pump in the heat pump system is faced at the current stage.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art or the related art.

To this end, a first aspect of the present invention is to provide a control method of a heat pump system.

In a second aspect of the present invention, a control apparatus for a heat pump system is provided.

A third aspect of the present invention is to provide a heat pump system.

A fourth aspect of the present invention is to provide a computer-readable storage medium.

In view of the above, according to a first aspect of the present invention, there is provided a control method of a heat pump system, wherein the heat pump system includes a water pump, the control method of the heat pump system includes: determining that a water pump is in an operating state, acquiring a first water inlet temperature of a heat pump system and acquiring a first moment of the first water inlet temperature; controlling the water pump to stop and start again to obtain a second water inlet temperature of the heat pump system and a second moment for collecting the second water inlet temperature; and controlling the running state of the water pump according to the first water inlet temperature, the first moment, the second water inlet temperature and the second moment.

The invention provides a control method of a heat pump system, wherein the heat pump system comprises a water pump, and particularly, when the water pump is in a running state, a first water inlet temperature of the heat pump system and a first time for acquiring the first water inlet temperature are acquired, and after the water pump is controlled to stop and is started to run again, a second water inlet temperature of the heat pump system and a second time for acquiring the second water inlet temperature are acquired, so that whether the water pump stops again is judged according to the first water inlet temperature, the first time, the second water inlet temperature and the second time.

In addition, the control method of the heat pump system in the above technical solution provided by the present invention may further have the following additional technical features:

in the above technical solution, the step of controlling the operation state of the water pump according to the first intake water temperature, the first time, the second intake water temperature, and the second time specifically includes: determining a first water inlet temperature difference according to the first water inlet temperature and the second water inlet temperature; determining a first time length according to the first time and the second time; determining a first temperature change rate according to the first water inlet temperature difference and the first time length; and controlling the operation state of the water pump according to the comparison result of the first temperature change rate and a pre-stored first rate interval.

In the technical scheme, the heat output speed of the heat pump system is represented by the first temperature change rate obtained through calculation, the running state of the water pump is determined according to the comparison result of the first temperature change rate and the first speed interval, and in the process, the running state of the water pump is controlled by the heat output speed of the heat pump system, so that the water pump can run when the heat output speed is high to ensure heat output, and meanwhile, the water pump stops running when the heat output speed is low to reduce the running power consumption of the water pump.

In any of the above technical solutions, the first rate interval includes a first rate threshold and a second rate threshold, where the first rate threshold is greater than the second rate threshold; the step of controlling the operation state of the water pump according to the comparison result of the first temperature change rate and a pre-stored first rate interval specifically includes: determining that the first temperature change rate is greater than or equal to a first rate threshold value, and controlling the water pump to continue to operate; or determining that the first temperature change rate is smaller than the first rate threshold and larger than or equal to the second rate threshold, and controlling the water pump to stop running for a second time and then to start again; or determining that the first temperature change rate is smaller than a second rate threshold value, and controlling the water pump to stop running for a third time and then to start again; wherein the second duration is less than the third duration.

In the technical scheme, when the first temperature change rate is greater than or equal to the first rate threshold, the heat output speed of the heat pump system is judged to be high, the water pump needs to be controlled to continue to operate to ensure the stable output of heat, and the situation that the use of a user is influenced due to the fact that a use end needing heat such as a floor heating system is frozen because the heat output speed is too low is avoided; meanwhile, when the first temperature change rate is smaller than the first rate threshold and is larger than or equal to the second rate threshold, the water pump is controlled to stop running for a second time and then to be started again, power consumption can be reduced by controlling the water pump to stop on the premise that heat output is not influenced, and meanwhile, the smaller the first temperature change rate is, the longer the time for stopping and restarting the water pump is, so that the power of the water pump is reduced to the minimum.

In any of the above solutions, the heat pump system further includes a compressor, and the control method of the heat pump system further includes: comparing the second inlet water temperature with a starting temperature of the compressor; determining that the second water inlet temperature is greater than or equal to the starting temperature of the compressor, and executing the step of controlling the running state of the water pump according to the first water inlet temperature, the first moment, the second water inlet temperature and the second moment; or determining that the second inlet water temperature is lower than the starting temperature of the compressor, and controlling the compressor and the water pump to start.

In the technical scheme, after the second water inlet temperature is obtained, the second water inlet temperature is compared with the starting temperature of the compressor to judge whether the compressor needs to be started to supplement heat to the heat pump system, specifically, when the second water inlet temperature is judged to be lower than the starting temperature of the compressor, the compressor is controlled to be started, and meanwhile, the water pump is controlled to continue to operate, so that the liquid temperature gradient in the heat pump system is reduced, and the local overhigh temperature is avoided; and when the second inlet water temperature is greater than or equal to the starting temperature of the compressor, the heat pump system can be judged to have more heat without heat supplement, and in the process, the second inlet water temperature is compared with the starting temperature of the compressor to provide a starting condition for the operation of the compressor, so that the heat pump system can stably output heat.

In any of the above technical solutions, before the step of determining that the water pump is in the operating state, obtaining the first water inlet temperature of the heat pump system, and acquiring the first time of the first water inlet temperature, the method further includes: acquiring a third inlet water temperature of the heat pump system and a third moment for acquiring the third inlet water temperature; the method comprises the steps of controlling the water pump to stop and start again, and specifically comprises the following steps: determining the running state of the water pump according to the first water inlet temperature, the first moment, the third water inlet temperature and the third moment; and determining that the shutdown time of the water pump is greater than or equal to the fourth time, and controlling the water pump to be started again.

In the technical scheme, before the step of determining that the water pump is in the running state, acquiring the first inlet water temperature of the heat pump system and the first time of acquiring the first inlet water temperature, the third inlet water temperature of the heat pump system and the third time of acquiring the third inlet water temperature are also acquired, so as to determine the operation state of the water pump based on the first intake water temperature, the first time, the third intake water temperature, and the third time, it can be understood that, when the water pump is in operation, the water inlet temperature at different moments is obtained, the heat output speed of the heat pump system is determined according to the water inlet temperature at different moments, and whether the water pump should stop is further determined, after the water pump is controlled to stop, and the stop time of the water pump is greater than or equal to the fourth time, the water pump is controlled to start again, the heat supply can be carried out at the use end needing heat such as floor heating, and the freezing condition caused by insufficient heat supply is avoided.

In any of the above technical solutions, the step of determining the operation state of the water pump according to the first intake water temperature, the first time, the third intake water temperature, and the third time specifically includes: determining a second inlet water temperature difference according to the first inlet water temperature and the third inlet water temperature; determining a fifth time length according to the first time and the third time; determining a second temperature change rate according to the second water inlet temperature difference and the fifth time length; and controlling the running state of the water pump according to the comparison result of the second temperature change rate and a pre-stored specified threshold value.

In the technical scheme, a second water inlet temperature difference is obtained by calculating a difference value between a third water inlet temperature and a first water inlet temperature, a fifth time duration is determined by combining a first time and a third time, and further, a ratio of the second water inlet temperature difference to the fifth time duration is calculated to obtain a heat output speed of the heat pump system when the water pump is in a continuous operation stage. The operating state of the water pump is determined by comparing the calculated second temperature change rate with a pre-stored specified threshold value, during which whether the water pump is always operated is controlled by the heat output speed of the heat pump system, and thus, the power consumption of the water pump is reduced.

In any of the above technical solutions, the step of controlling the operation state of the water pump according to the comparison result between the second temperature change rate and the pre-stored specified threshold specifically includes: determining that the second temperature change rate is greater than or equal to a specified threshold value, and controlling the water pump to operate; or determining that the second temperature change rate is smaller than a specified threshold value, and controlling the water pump to stop running.

In the technical scheme, the second temperature change rate is determined to be greater than or equal to a specified threshold value, the water pump is controlled to operate to maintain the heat pump system to stably output heat, and the water pump is controlled to stop operating when the second temperature change rate is determined to be less than the specified threshold value, so that the problem of overhigh power consumption caused by continuous operation of the water pump is avoided.

In any of the above technical solutions, after the step of controlling the operation state of the water pump according to the first intake water temperature, the first time, the second intake water temperature, and the second time, the method further includes: determining that the water pump operates again, and acquiring a fourth water inlet temperature of the heat pump system and a fourth moment for acquiring the fourth water inlet temperature; and determining the running state of the water pump according to the second water inlet temperature, the second moment, the fourth water inlet temperature and the fourth moment.

In the technical scheme, after the step of controlling the running state of the water pump according to the first water inlet temperature, the first moment, the second water inlet temperature and the second moment, the water pump is determined to run again, and a fourth water inlet temperature of the heat pump system and a fourth moment for acquiring the fourth water inlet temperature are obtained; and determining the running state of the water pump according to the second water inlet temperature, the second moment, the fourth water inlet temperature and the fourth moment, wherein in the stage, the running state of the water pump is controlled by the water inlet temperature of the last shutdown, so that the water pump cannot be in a running state all the time, and the power consumption of the water pump is reduced.

In any of the above technical solutions, the step of determining the operation state of the water pump according to the second water inlet temperature, the second time, the fourth water inlet temperature, and the fourth time specifically includes: determining a third inlet water temperature difference according to the second inlet water temperature and the fourth inlet water temperature; determining a sixth time length according to the second time and the fourth time; determining a third temperature change rate according to the third water inlet temperature difference and the sixth time length; and controlling the operation state of the water pump according to the comparison result of the third temperature change rate and a pre-stored second rate interval.

In the technical scheme, the heat output speed of the heat pump system is represented by the calculated third temperature change rate, the running state of the water pump is determined according to the comparison result between the third temperature change rate and the second speed interval, and in the process, the running state of the water pump is controlled by the heat output speed of the heat pump system, so that the water pump can run when the heat output speed is high to ensure heat output, and meanwhile, the water pump stops running when the heat output speed is low to reduce the running power consumption of the water pump.

In any of the above technical solutions, the second rate section includes a third rate threshold and a fourth rate threshold, where the third rate threshold is greater than the fourth rate threshold; the step of controlling the operation state of the water pump according to the comparison result between the third temperature change rate and a pre-stored second rate interval specifically includes: determining that the third temperature change rate is greater than or equal to a third rate threshold value, and controlling the water pump to continue to operate; or determining that the third temperature change rate is smaller than the third speed threshold and greater than or equal to the fourth speed threshold, and controlling the water pump to stop running for a seventh time and then to start again; or determining that the third temperature change rate is smaller than a fourth rate threshold value, and controlling the water pump to stop running for an eighth time period and then to start again; wherein the seventh duration is less than the eighth duration.

In the technical scheme, when the third temperature change rate is greater than or equal to the third rate threshold, the heat output speed of the heat pump system is determined to be high, the stable output of heat can be ensured only by controlling the water pump to continuously operate, and the influence on the use of a user due to freezing of a user end needing heat such as a floor heating and the like caused by the fact that the heat output speed is too low is avoided; meanwhile, when the third temperature change rate is smaller than the third speed threshold and is larger than or equal to the fourth speed threshold, the water pump is controlled to stop running for a seventh time and then to be started again, power consumption can be reduced by controlling the water pump to stop on the premise of not influencing heat output, and meanwhile, the smaller the third temperature change rate is, the longer the time for stopping and restarting the water pump is, so that the power of the water pump is reduced to the minimum.

In any of the above technical solutions, the method further includes: comparing the fourth inlet water temperature with a start-up temperature of the compressor; determining that the fourth water inlet temperature is greater than or equal to the starting temperature of the compressor, and executing the step of determining the running state of the water pump according to the second water inlet temperature, the second moment, the fourth water inlet temperature and the fourth moment; or determining that the fourth inlet water temperature is lower than the starting temperature of the compressor, and controlling the compressor and the water pump to start.

In the technical scheme, after the fourth water inlet temperature is obtained, the fourth water inlet temperature is compared with the starting temperature of the compressor to judge whether the compressor needs to be started to supplement heat to the heat pump system, specifically, when the fourth water inlet temperature is judged to be lower than the starting temperature of the compressor, the compressor is controlled to be started, and meanwhile, the water pump is controlled to continue to operate to reduce the liquid temperature gradient in the heat pump system and avoid the local overhigh temperature; and when the fourth inlet water temperature is greater than or equal to the starting temperature of the compressor, the heat pump system can be judged to have more heat without heat supplement, and in the process, the fourth inlet water temperature is compared with the starting temperature of the compressor to provide a starting condition for the operation of the compressor, so that the heat pump system can stably output heat.

In any of the above technical solutions, before the step of determining that the water pump is in the operating state, obtaining the first water inlet temperature of the heat pump system, and acquiring the first time of the first water inlet temperature, the method further includes: acquiring the outlet water temperature of a heat pump system; and determining that the water temperature is greater than or equal to a pre-stored temperature threshold value, and controlling the compressor to stop running.

In the technical scheme, when the obtained outlet water temperature of the heat pump system is greater than a pre-stored temperature threshold value, the compressor is controlled to stop running, so that the compressor is prevented from continuously working and outputting excessive heat, and unnecessary energy consumption is avoided.

And determining that the water temperature is less than a pre-stored temperature threshold value, and controlling the compressor to continue to operate to provide stable heat output.

In any of the above technical solutions, the method further includes: the fourth time period is determined based on the first inlet water temperature.

In the technical scheme, the fourth time length is determined to be associated with the first water inlet temperature, so that when the water pump is stopped within the fourth time length, the use end needing heat such as floor heating and the like cannot be frozen due to too low temperature caused by overlong stop time, the fourth time length is determined according to the first water inlet temperature, and the influence of the stop of the water pump on use is reduced.

In a second aspect of the present invention, a control device of a heat pump system is provided, wherein the heat pump system includes a water pump, specifically, the control device of the heat pump system includes: the device comprises a memory and a processor, wherein the memory stores a computer program, and when the computer program is executed by the processor, the first water inlet temperature of the heat pump system and the first time for acquiring the first water inlet temperature are acquired if the water pump is determined to be in the running state; controlling the water pump to stop and start again to obtain a second water inlet temperature of the heat pump system and a second moment for collecting the second water inlet temperature; and controlling the running state of the water pump according to the first water inlet temperature, the first time, the second water inlet temperature and the second time.

The invention provides a control device of a heat pump system, and particularly relates to a control device of the heat pump system, wherein a processor executes a computer program stored in a memory to realize that when a water pump is in a running state, a first water inlet temperature of the heat pump system and a first moment for acquiring the first water inlet temperature are acquired, and after the water pump is controlled to stop and is started to run again, a second water inlet temperature of the heat pump system and a second moment for acquiring the second water inlet temperature are acquired, so that whether the water pump stops again or not is judged according to the first water inlet temperature, the first moment, the second water inlet temperature and the second moment.

In addition, the control device of the heat pump system according to the above aspect of the present invention may further include the following additional features:

in the technical scheme, the processor executes a computer program stored on the memory to specifically realize that the first water inlet temperature difference is determined according to the first water inlet temperature and the second water inlet temperature; determining a first time length according to the first time and the second time; determining a first temperature change rate according to the first water inlet temperature difference and the first time length; and controlling the operation state of the water pump according to the comparison result of the first temperature change rate and a pre-stored first rate interval.

In any of the above technical solutions, the first rate interval includes a first rate threshold and a second rate threshold, where the first rate threshold is greater than the second rate threshold, and the processor executes a computer program stored in the memory to specifically implement that the first temperature change rate is determined to be greater than or equal to the first rate threshold, and the water pump is controlled to continue to operate; or determining that the first temperature change rate is smaller than the first rate threshold and larger than or equal to the second rate threshold, and controlling the water pump to stop running for a second time and then to start again; or determining that the first temperature change rate is smaller than a second rate threshold value, and controlling the water pump to stop running for a third time and then to start again; wherein the second duration is less than the third duration.

In any of the above solutions, the heat pump system further includes a compressor, and the processor further executes a computer program stored in the memory to compare the second inlet water temperature with a start temperature of the compressor; determining that the second water inlet temperature is greater than or equal to the starting temperature of the compressor, and executing the step of controlling the running state of the water pump according to the first water inlet temperature, the first moment, the second water inlet temperature and the second moment; or determining that the second inlet water temperature is lower than the starting temperature of the compressor, and controlling the compressor and the water pump to start.

In any of the above technical solutions, before the step of determining that the water pump is in the operating state, acquiring the first inlet water temperature of the heat pump system, and acquiring the first time of the first inlet water temperature, the processor further executes a computer program stored on the memory to implement: acquiring a third inlet water temperature of the heat pump system and a third moment for acquiring the third inlet water temperature; controlling the water pump to stop and start again, and determining the running state of the water pump according to the first water inlet temperature, the first moment, the third water inlet temperature and the third moment; and determining that the shutdown time of the water pump is greater than or equal to the fourth time, and controlling the water pump to be started again.

In any of the above technical solutions, the processor executes the computer program stored in the memory to implement: determining a second inlet water temperature difference according to the first inlet water temperature and the third inlet water temperature; determining a fifth time length according to the first time and the third time; determining a second temperature change rate according to the second water inlet temperature difference and the fifth time length; and controlling the running state of the water pump according to the comparison result of the second temperature change rate and a pre-stored specified threshold value.

In any of the above technical solutions, the processor executes the computer program stored in the memory to implement: determining that the second temperature change rate is greater than or equal to a specified threshold value, and controlling the water pump to operate; or determining that the second temperature change rate is smaller than a specified threshold value, and controlling the water pump to stop running.

In any of the above solutions, after the step of controlling the operation state of the water pump according to the first intake water temperature, the first time, the second intake water temperature, and the second time, the processor further executes the computer program stored in the memory to implement: determining that the water pump operates again, and acquiring a fourth water inlet temperature of the heat pump system and a fourth moment for acquiring the fourth water inlet temperature; and determining the running state of the water pump according to the second water inlet temperature, the second moment, the fourth water inlet temperature and the fourth moment.

In any of the above technical solutions, the processor executes the computer program stored in the memory to implement: determining a third inlet water temperature difference according to the second inlet water temperature and the fourth inlet water temperature; determining a sixth time length according to the second time and the fourth time; determining a third temperature change rate according to the third water inlet temperature difference and the sixth time length; and controlling the operation state of the water pump according to the comparison result of the third temperature change rate and a pre-stored second rate interval.

In any of the above technical solutions, the second rate section includes a third rate threshold and a fourth rate threshold, where the third rate threshold is greater than the fourth rate threshold; the processor executes the computer program stored on the memory to implement: determining that the third temperature change rate is greater than or equal to a third rate threshold value, and controlling the water pump to continue to operate; or determining that the third temperature change rate is smaller than the third speed threshold and greater than or equal to the fourth speed threshold, and controlling the water pump to stop running for a seventh time and then to start again; or determining that the third temperature change rate is smaller than a fourth rate threshold value, and controlling the water pump to stop running for an eighth time period and then to start again; wherein the seventh duration is less than the eighth duration.

In any of the above solutions, the processor further executes a computer program stored in the memory to implement: comparing the fourth inlet water temperature with a start-up temperature of the compressor; determining that the fourth water inlet temperature is greater than or equal to the starting temperature of the compressor, and executing the step of determining the running state of the water pump according to the second water inlet temperature, the second moment, the fourth water inlet temperature and the fourth moment; or determining that the fourth inlet water temperature is lower than the starting temperature of the compressor, and controlling the compressor and the water pump to start.

In any of the above technical solutions, before the step of determining that the water pump is in the operating state, acquiring the first inlet water temperature of the heat pump system, and acquiring the first time of the first inlet water temperature, the processor further executes a computer program stored on the memory to implement: acquiring the outlet water temperature of a heat pump system; and determining that the water temperature is greater than or equal to a pre-stored temperature threshold value, and controlling the compressor to stop running.

It is determined that the water temperature is less than a pre-stored temperature threshold and the compressor operation is controlled to provide a stable heat output.

In any of the above solutions, the processor further executes a computer program stored in the memory to implement: the fourth time period is determined based on the first inlet water temperature.

According to a third aspect of the present invention, there is provided a heat pump system comprising: a compressor; a water pump; the control device of the heat pump system according to any one of the above aspects, wherein the control device of the heat pump system is connected to the compressor and the water pump, and the control device of the heat pump system is configured to control the operation of the compressor and the water pump.

The heat pump system provided by the present invention includes any one of the above control devices of the heat pump system, so the heat pump system has all the beneficial technical effects of any one of the above control devices of the heat pump system, and details are not repeated herein.

In a fourth aspect of the present invention, a computer-readable storage medium is presented, in which a computer program is stored, which, when executed, implements the steps of the control method of the heat pump system as defined in any one of the above.

The present invention provides a computer-readable storage medium, wherein a computer program stored in the computer-readable storage medium implements the steps of the control method of any of the above heat pump systems when running, so that the control method of any of the above heat pump systems has all the beneficial technical effects, and details are not repeated herein.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 shows a flow chart diagram of a control method of a heat pump system according to an embodiment of the invention;

fig. 2 shows a flow chart diagram of a control method of a heat pump system according to another embodiment of the invention;

fig. 3 shows a flow chart diagram of a control method of a heat pump system according to a further embodiment of the invention;

fig. 4 shows a flow chart diagram of a control method of a heat pump system according to an embodiment of the invention;

fig. 5 shows a flow chart diagram of a control method of the heat pump system according to an embodiment of the invention;

fig. 6 shows a schematic block diagram of a control arrangement of a heat pump system according to an embodiment of the invention;

FIG. 7 shows a schematic block diagram of a heat pump system according to one embodiment of the present invention;

FIG. 8 shows a schematic block diagram of a heat pump system according to one embodiment of the present invention;

fig. 9 shows a flow chart diagram of a control method of the heat pump system according to an embodiment of the invention;

FIG. 10 is a graphical illustration of a first pump down time period versus a first inlet water temperature in accordance with an embodiment of the present invention;

FIG. 11 is a graphical illustration of a second pump down time period versus a first rate of temperature change in accordance with an embodiment of the present invention;

FIG. 12 is a schematic diagram illustrating a second rate of temperature change versus water pump shutdown, in accordance with an embodiment of the present invention.

Wherein, the correspondence between the reference numbers and the names of the components in fig. 8 is:

800 heat pump system, 702 compressor, 704 water pump, 802 four-way valve, 804 fin heat exchanger, 806 electronic expansion valve, 808 water side heat exchanger, 810 first temperature detection device, 812 second temperature detection device, 814 water side.

Detailed Description

So that the manner in which the above recited aspects, features and advantages of the present invention can be understood in detail, a more particular description of the invention, briefly summarized above, may be had by reference to the embodiments thereof which are illustrated in the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.

Example one

In an embodiment of the present invention, as shown in fig. 1, a control method of a heat pump system including a water pump is provided, wherein the control method of the heat pump system includes:

step 102: determining that a water pump is in an operating state, acquiring a first water inlet temperature of a heat pump system and acquiring a first moment of the first water inlet temperature;

step 104: controlling the water pump to stop and start again to obtain a second water inlet temperature of the heat pump system and a second moment for collecting the second water inlet temperature;

step 106: and controlling the running state of the water pump according to the first water inlet temperature, the first moment, the second water inlet temperature and the second moment.

Example two

In the above embodiment, the heat pump system further includes a compressor, and as shown in fig. 2, the control method of the heat pump system includes:

step 202: determining that a water pump is in an operating state, acquiring a first water inlet temperature of a heat pump system and acquiring a first moment of the first water inlet temperature;

step 204: controlling the water pump to stop and start again to obtain a second water inlet temperature of the heat pump system and a second moment for collecting the second water inlet temperature;

step 206: comparing the second inlet water temperature with a starting temperature of the compressor;

step 208: determining that the second water inlet temperature is greater than or equal to the starting temperature of the compressor, and controlling the running state of the water pump according to the first water inlet temperature, the first moment, the second water inlet temperature and the second moment;

step 210: and determining that the second inlet water temperature is lower than the starting temperature of the compressor, and controlling the compressor and the water pump to start.

In this embodiment, after the second water inlet temperature is obtained, the second water inlet temperature is compared with the starting temperature of the compressor to determine whether the compressor needs to be started to supplement heat to the heat pump system, specifically, when the second water inlet temperature is determined to be lower than the starting temperature of the compressor, the compressor is controlled to be started, and the water pump is controlled to continue to operate to reduce the liquid temperature gradient in the heat pump system and avoid the occurrence of local over-high temperature; and when the second inlet water temperature is greater than or equal to the starting temperature of the compressor, the heat pump system can be judged to have more heat without heat supplement, and in the process, the second inlet water temperature is compared with the starting temperature of the compressor to provide a starting condition for the operation of the compressor, so that the heat pump system can stably output heat.

In one embodiment, as shown in fig. 3, the method for controlling a heat pump system includes:

step 302, acquiring the outlet water temperature of the heat pump system;

step 304, determining that the water temperature is greater than or equal to a pre-stored temperature threshold value, and controlling the compressor to stop running;

step 306: determining that a water pump is in an operating state, acquiring a first water inlet temperature of a heat pump system and acquiring a first moment of the first water inlet temperature;

step 308: controlling the water pump to stop and start again to obtain a second water inlet temperature of the heat pump system and a second moment for collecting the second water inlet temperature;

step 310: comparing the second inlet water temperature with a starting temperature of the compressor;

step 312: determining that the second water inlet temperature is greater than or equal to the starting temperature of the compressor, and controlling the running state of the water pump according to the first water inlet temperature, the first moment, the second water inlet temperature and the second moment;

step 314: and determining that the second inlet water temperature is lower than the starting temperature of the compressor, and controlling the compressor and the water pump to start.

In this embodiment, when the obtained outlet water temperature of the heat pump system is greater than the pre-stored temperature threshold, the compressor is controlled to stop operating, so as to avoid that the compressor continues to operate and outputs excessive heat, which generates unnecessary energy consumption.

Wherein it is determined that the water temperature is less than a pre-stored temperature threshold, the compressor is controlled to continue to operate to provide a stable heat output.

In one embodiment, as shown in fig. 4, the method for controlling a heat pump system includes:

step 402: acquiring a third inlet water temperature of the heat pump system and a third moment for acquiring the third inlet water temperature;

step 404: determining that a water pump is in an operating state, acquiring a first water inlet temperature of a heat pump system and acquiring a first moment of the first water inlet temperature;

step 406: determining the running state of the water pump according to the first water inlet temperature, the first moment, the third water inlet temperature and the third moment;

step 408: determining that the shutdown time of the water pump is longer than or equal to a fourth time, controlling the water pump to be restarted, and acquiring a second water inlet temperature of the heat pump system and a second time for acquiring the second water inlet temperature;

step 410: comparing the second inlet water temperature with a starting temperature of the compressor;

step 412: determining that the second water inlet temperature is greater than or equal to the starting temperature of the compressor, and controlling the running state of the water pump according to the first water inlet temperature, the first moment, the second water inlet temperature and the second moment;

step 414: and determining that the second inlet water temperature is lower than the starting temperature of the compressor, and controlling the compressor and the water pump to start.

In the embodiment, before the step of determining that the water pump is in the running state, acquiring the first inlet water temperature of the heat pump system and the first moment of acquiring the first inlet water temperature, acquiring a third inlet water temperature of the heat pump system and a third moment of acquiring the third inlet water temperature, so as to determine the operation state of the water pump based on the first intake water temperature, the first time, the third intake water temperature, and the third time, it can be understood that, when the water pump is in operation, the water inlet temperature at different moments is obtained, the heat output speed of the heat pump system is determined according to the water inlet temperature at different moments, and whether the water pump should stop is further determined, after the water pump is controlled to stop, and the stop time of the water pump is greater than or equal to the fourth time, the water pump is controlled to start again, the heat supply can be carried out at the use end needing heat such as floor heating, and the freezing condition caused by insufficient heat supply is avoided.

In one embodiment, the method further comprises: the fourth time period is determined based on the first inlet water temperature.

In the embodiment, the fourth time is determined to be associated with the first water inlet temperature, so that when the water pump is stopped in the fourth time, the use end needing heat such as floor heating and the like cannot be frozen due to too low temperature caused by overlong stop time, and the influence of the stop of the water pump on the use is reduced by determining the fourth time according to the first water inlet temperature.

In an embodiment of the present invention, after the step of controlling the operation state of the water pump according to the first intake water temperature, the first time, the second intake water temperature, and the second time, as shown in fig. 5, the method further includes:

step 502; determining that the water pump operates again, and acquiring a fourth water inlet temperature of the heat pump system and a fourth moment for acquiring the fourth water inlet temperature;

step 504; and determining the running state of the water pump according to the second water inlet temperature, the second moment, the fourth water inlet temperature and the fourth moment.

In the embodiment, after the step of controlling the operation state of the water pump according to the first water inlet temperature, the first time, the second water inlet temperature and the second time, determining that the water pump operates again, acquiring a fourth water inlet temperature of the heat pump system and acquiring a fourth time of the fourth water inlet temperature; and determining the running state of the water pump according to the second water inlet temperature, the second moment, the fourth water inlet temperature and the fourth moment, wherein in the stage, the running state of the water pump is controlled by the water inlet temperature of the last shutdown, so that the water pump cannot be in a running state all the time, and the power consumption of the water pump is reduced.

In one embodiment, the method further comprises: comparing the fourth inlet water temperature with a start-up temperature of the compressor; determining that the fourth water inlet temperature is greater than or equal to the starting temperature of the compressor, and executing the step of determining the running state of the water pump according to the second water inlet temperature, the second moment, the fourth water inlet temperature and the fourth moment; or determining that the fourth inlet water temperature is lower than the starting temperature of the compressor, and controlling the compressor and the water pump to start.

In this embodiment, after the fourth water inlet temperature is obtained, the fourth water inlet temperature is compared with the starting temperature of the compressor to determine whether the compressor needs to be started to supplement heat to the heat pump system, specifically, when the fourth water inlet temperature is determined to be lower than the starting temperature of the compressor, the compressor is controlled to start, and the water pump is controlled to continue to operate to reduce the liquid temperature gradient in the heat pump system and avoid the occurrence of local over-high temperature; and when the fourth inlet water temperature is greater than or equal to the starting temperature of the compressor, the heat pump system can be judged to have more heat without heat supplement, and in the process, the fourth inlet water temperature is compared with the starting temperature of the compressor to provide a starting condition for the operation of the compressor, so that the heat pump system can stably output heat.

EXAMPLE III

In any of the above embodiments, the step of controlling the operation state of the water pump according to the first intake water temperature, the first time, the second intake water temperature, and the second time specifically includes: determining a first water inlet temperature difference according to the first water inlet temperature and the second water inlet temperature; determining a first time length according to the first time and the second time; determining a first temperature change rate according to the first water inlet temperature difference and the first time length; and controlling the operation state of the water pump according to the comparison result of the first temperature change rate and a pre-stored first rate interval.

In this embodiment, a first inlet water temperature difference is obtained by calculating a difference between a first inlet water temperature and a second inlet water temperature, a time elapsed for the first inlet water temperature difference is determined using a first time and a second time, a first temperature change rate is determined according to the first inlet water temperature difference and the first time, an operation state of the water pump is determined according to a comparison result of the first temperature change rate and a pre-stored first rate interval, in the process, a heat output speed of the heat pump system is represented by the calculated first temperature change rate, and the operation state of the water pump is determined according to a comparison result of the first temperature change rate and the first rate interval, in the process, the operation state of the water pump is controlled by the heat output speed of the heat pump system, so that the water pump can be operated when the heat output speed is high to ensure heat output, meanwhile, the operation is stopped when the heat output speed is low, so that the operation power consumption of the water pump is reduced.

In one embodiment thereof, the first rate interval comprises a first rate threshold and a second rate threshold, wherein the first rate threshold is greater than the second rate threshold; the step of controlling the operation state of the water pump according to the comparison result of the first temperature change rate and a pre-stored first rate interval specifically includes: determining that the first temperature change rate is greater than or equal to a first rate threshold value, and controlling the water pump to continue to operate; or determining that the first temperature change rate is smaller than the first rate threshold and larger than or equal to the second rate threshold, and controlling the water pump to stop running for a second time and then to start again; or determining that the first temperature change rate is smaller than a second rate threshold value, and controlling the water pump to stop running for a third time and then to start again; wherein the second duration is less than the third duration.

In the embodiment, when the first temperature change rate is greater than or equal to the first rate threshold, it is determined that the heat output speed of the heat pump system is high, and the water pump needs to be controlled to continue to operate to ensure stable heat output, so that the situation that the use of a user is influenced due to freezing of a use end needing heat, such as a floor heating system, caused by too low heat output speed is avoided; meanwhile, when the first temperature change rate is smaller than the first rate threshold and is larger than or equal to the second rate threshold, the water pump is controlled to stop running for a second time and then to be started again, power consumption can be reduced by controlling the water pump to stop on the premise that heat output is not influenced, and meanwhile, the smaller the first temperature change rate is, the longer the time for stopping and restarting the water pump is, so that the power of the water pump is reduced to the minimum.

Example four

In any of the above embodiments, the step of determining the operation state of the water pump according to the first intake water temperature, the first time, the third intake water temperature, and the third time specifically includes: determining a second inlet water temperature difference according to the first inlet water temperature and the third inlet water temperature; determining a fifth time length according to the first time and the third time; determining a second temperature change rate according to the second water inlet temperature difference and the fifth time length; and controlling the running state of the water pump according to the comparison result of the second temperature change rate and a pre-stored specified threshold value.

In the embodiment, the difference value between the third inlet water temperature and the first inlet water temperature is calculated to obtain a second inlet water temperature difference, the fifth time period is determined by combining the first time and the third time, and further, the ratio of the second inlet water temperature difference to the fifth time period is calculated to obtain the heat output speed of the heat pump system when the water pump is in the continuous operation stage. The operating state of the water pump is determined by comparing the calculated second temperature change rate with a pre-stored specified threshold value, during which whether the water pump is always operated is controlled by the heat output speed of the heat pump system, and thus, the power consumption of the water pump is reduced.

In an embodiment of the present invention, the step of controlling the operation state of the water pump according to the comparison result between the second temperature change rate and the pre-stored specified threshold specifically includes: determining that the second temperature change rate is greater than or equal to a specified threshold value, and controlling the water pump to operate; or determining that the second temperature change rate is smaller than a specified threshold value, and controlling the water pump to stop running.

In the embodiment, the second temperature change rate is determined to be greater than or equal to the specified threshold, the water pump is controlled to operate to maintain the heat pump system to stably output heat, and the water pump is controlled to stop operating when the second temperature change rate is determined to be less than the specified threshold, so that the problem of overhigh power consumption caused by continuous operation of the water pump is avoided.

EXAMPLE five

In any of the above embodiments, the step of determining the operation state of the water pump according to the second water inlet temperature, the second time, the fourth water inlet temperature, and the fourth time specifically includes: determining a third inlet water temperature difference according to the second inlet water temperature and the fourth inlet water temperature; determining a sixth time length according to the second time and the fourth time; determining a third temperature change rate according to the third water inlet temperature difference and the sixth time length; and controlling the operation state of the water pump according to the comparison result of the third temperature change rate and a pre-stored second rate interval.

In this embodiment, the heat output speed of the heat pump system is characterized by the calculated third temperature change rate, and the operation state of the water pump is determined according to the comparison result between the third temperature change rate and the second speed interval.

In any of the above embodiments, the second rate interval includes a third rate threshold and a fourth rate threshold, where the third rate threshold is greater than the fourth rate threshold; the step of controlling the operation state of the water pump according to the comparison result between the third temperature change rate and a pre-stored second rate interval specifically includes: determining that the third temperature change rate is greater than or equal to a third rate threshold value, and controlling the water pump to continue to operate; or determining that the third temperature change rate is smaller than the third speed threshold and greater than or equal to the fourth speed threshold, and controlling the water pump to stop running for a seventh time and then to start again; or determining that the third temperature change rate is smaller than a fourth rate threshold value, and controlling the water pump to stop running for an eighth time period and then to start again; wherein the seventh duration is less than the eighth duration.

In this embodiment, when the third temperature change rate is greater than or equal to the third rate threshold, it is determined that the heat output speed of the heat pump system is fast, and the water pump needs to be controlled to continue to operate to ensure stable output of heat, so as to avoid that a user such as a floor heating system, which needs heat, is frozen due to an excessively low heat output speed, and the use of the user is affected; meanwhile, when the third temperature change rate is smaller than the third speed threshold and is larger than or equal to the fourth speed threshold, the water pump is controlled to stop running for a seventh time and then to be started again, power consumption can be reduced by controlling the water pump to stop on the premise of not influencing heat output, and meanwhile, the smaller the third temperature change rate is, the longer the time for stopping and restarting the water pump is, so that the power of the water pump is reduced to the minimum.

In an embodiment of the invention, the first rate interval and the second rate interval are the same, i.e. the first rate threshold and the third rate threshold are the same, the second rate threshold and the fourth rate threshold are the same, the second duration is equal to the seventh duration, and the third duration is equal to the eighth duration.

EXAMPLE six

In an embodiment of the present invention, as shown in fig. 6, a control device 600 of a heat pump system is provided, wherein the heat pump system includes a water pump, specifically, the control device 600 of the heat pump system includes: the water pump system comprises a memory 602 and a processor 604, wherein the memory 602 stores computer programs, and when the computer programs are executed by the processor 604, the first time for acquiring a first inlet water temperature of the heat pump system and acquiring the first inlet water temperature is realized if the water pump is determined to be in an operating state; controlling the water pump to stop and start again to obtain a second water inlet temperature of the heat pump system and a second moment for collecting the second water inlet temperature; and controlling the running state of the water pump according to the first water inlet temperature, the first time, the second water inlet temperature and the second time.

The invention provides a control device 600 of a heat pump system, and particularly, a processor 604 executes a computer program stored in a memory 602 to acquire a first water inlet temperature of the heat pump system and a first time for acquiring the first water inlet temperature when a water pump is in an operating state, and acquire a second water inlet temperature of the heat pump system and a second time for acquiring the second water inlet temperature after the water pump is controlled to stop and is started again to operate, so that whether the water pump stops again is judged according to the first water inlet temperature, the first time, the second water inlet temperature and the second time.

In addition, the control device 600 of the heat pump system in the above embodiment of the present invention may further have the following additional features:

in the above-described embodiment, the processor 604 executing the computer program stored on the memory 602 embodies determining the first inlet water temperature differential based on the first inlet water temperature and the second inlet water temperature; determining a first time length according to the first time and the second time; determining a first temperature change rate according to the first water inlet temperature difference and the first time length; and controlling the operation state of the water pump according to the comparison result of the first temperature change rate and a pre-stored first rate interval.

In the embodiment, the heat output speed of the heat pump system is represented by the calculated first temperature change rate, and the operation state of the water pump is determined according to the comparison result of the first temperature change rate and the first speed interval, in the process, the operation state of the water pump is controlled by the heat output speed of the heat pump system, so that the water pump can be operated when the heat output speed is higher to ensure heat output, and meanwhile, the operation is stopped when the heat output speed is lower to reduce the operation power consumption of the water pump.

In any of the above embodiments, the first rate interval includes a first rate threshold and a second rate threshold, where the first rate threshold is greater than the second rate threshold, and the processor 604 executes a computer program stored on the memory 602 to implement the determination that the first rate of temperature change is greater than or equal to the first rate threshold and control the water pump to continue to operate; or determining that the first temperature change rate is smaller than the first rate threshold and larger than or equal to the second rate threshold, and controlling the water pump to stop running for a second time and then to start again; or determining that the first temperature change rate is smaller than a second rate threshold value, and controlling the water pump to stop running for a third time and then to start again; wherein the second duration is less than the third duration.

In any of the above embodiments, the heat pump system further comprises a compressor, and the processor 604 further executes a computer program stored on the memory 602 to compare the second inlet water temperature to a start-up temperature of the compressor; determining that the second water inlet temperature is greater than or equal to the starting temperature of the compressor, and executing the step of controlling the running state of the water pump according to the first water inlet temperature, the first moment, the second water inlet temperature and the second moment; or determining that the second inlet water temperature is lower than the starting temperature of the compressor, and controlling the compressor and the water pump to start.

In any of the above embodiments, before the steps of determining that the water pump is in the operating state, obtaining the first inlet water temperature of the heat pump system, and acquiring the first time of the first inlet water temperature, the processor 604 further executes the computer program stored on the memory 602 to implement: acquiring a third inlet water temperature of the heat pump system and a third moment for acquiring the third inlet water temperature; controlling the water pump to stop and start again, and determining the running state of the water pump according to the first water inlet temperature, the first moment, the third water inlet temperature and the third moment; and determining that the shutdown time of the water pump is greater than or equal to the fourth time, and controlling the water pump to be started again.

In any of the above embodiments, processor 604 executes computer programs stored on memory 602 to implement: determining a second inlet water temperature difference according to the first inlet water temperature and the third inlet water temperature; determining a fifth time length according to the first time and the third time; determining a second temperature change rate according to the second water inlet temperature difference and the fifth time length; and controlling the running state of the water pump according to the comparison result of the second temperature change rate and a pre-stored specified threshold value.

In any of the above embodiments, processor 604 executes computer programs stored on memory 602 to implement: determining that the second temperature change rate is greater than or equal to a specified threshold value, and controlling the water pump to operate; or determining that the second temperature change rate is smaller than a specified threshold value, and controlling the water pump to stop running.

In any of the above embodiments, after the step of controlling the operation state of the water pump according to the first intake water temperature, the first time, the second intake water temperature and the second time, the processor 604 further executes the computer program stored on the memory 602 to implement: determining that the water pump operates again, and acquiring a fourth water inlet temperature of the heat pump system and a fourth moment for acquiring the fourth water inlet temperature; and determining the running state of the water pump according to the second water inlet temperature, the second moment, the fourth water inlet temperature and the fourth moment.

In any of the above embodiments, processor 604 executes computer programs stored on memory 602 to implement: determining a third inlet water temperature difference according to the second inlet water temperature and the fourth inlet water temperature; determining a sixth time length according to the second time and the fourth time; determining a third temperature change rate according to the third water inlet temperature difference and the sixth time length; and controlling the operation state of the water pump according to the comparison result of the third temperature change rate and a pre-stored second rate interval.

In any of the above embodiments, the second rate interval includes a third rate threshold and a fourth rate threshold, where the third rate threshold is greater than the fourth rate threshold; the processor 604 executes the computer program embodied on the memory 602: determining that the third temperature change rate is greater than or equal to a third rate threshold value, and controlling the water pump to continue to operate; or determining that the third temperature change rate is smaller than the third speed threshold and greater than or equal to the fourth speed threshold, and controlling the water pump to stop running for a seventh time and then to start again; or determining that the third temperature change rate is smaller than a fourth rate threshold value, and controlling the water pump to stop running for an eighth time period and then to start again; wherein the seventh duration is less than the eighth duration.

In any of the above embodiments, processor 604 further executes computer programs stored on memory 602 to implement: comparing the fourth inlet water temperature with a start-up temperature of the compressor; determining that the fourth water inlet temperature is greater than or equal to the starting temperature of the compressor, and executing the step of determining the running state of the water pump according to the second water inlet temperature, the second moment, the fourth water inlet temperature and the fourth moment; or determining that the fourth inlet water temperature is lower than the starting temperature of the compressor, and controlling the compressor and the water pump to start.

In any of the above embodiments, before the steps of determining that the water pump is in the operating state, obtaining the first inlet water temperature of the heat pump system, and acquiring the first time of the first inlet water temperature, the processor 604 further executes the computer program stored on the memory 602 to implement: acquiring the outlet water temperature of a heat pump system; and determining that the water temperature is greater than or equal to a pre-stored temperature threshold value, and controlling the compressor to stop running.

In this embodiment, when the obtained outlet water temperature of the heat pump system is greater than the pre-stored temperature threshold, the compressor is controlled to stop operating, so as to avoid that the compressor continues to operate and outputs excessive heat, which generates unnecessary energy consumption. Wherein it is determined that the water temperature is less than a pre-stored temperature threshold, the compressor is controlled to operate to provide a stable heat output.

In any of the above embodiments, processor 604 further executes computer programs stored on memory 602 to implement: the fourth time period is determined based on the first inlet water temperature.

EXAMPLE seven

In one embodiment of the present invention, as shown in fig. 7, a heat pump system 700 is provided, comprising: a compressor 702; a water pump 704; as for the control device 600 of the heat pump system according to any of the above embodiments, the control device 600 of the heat pump system is connected to the compressor 702 and the water pump 704, and the control device 600 of the heat pump system is configured to control the operation of the compressor 702 and the water pump 704.

In the heat pump system 700 provided by the present invention, the heat pump system 700 includes the control device 600 of any of the heat pump systems described above, so the heat pump system 700 has all the beneficial technical effects of the control device 600 of any of the heat pump systems described above, and details thereof are not repeated herein.

In one embodiment of the present invention, as shown in fig. 8, a heat pump system 800 includes: the system comprises a compressor 702, a water pump 704, a four-way valve 802, a finned heat exchanger 804, an electronic expansion valve 806 and a water side heat exchanger 808, wherein the compressor 702 provides heat for the water side heat exchanger 808 so as to heat water flowing through the water side heat exchanger 808, a first temperature detection device 810 is arranged at a water inlet of the water side heat exchanger 808 and used for detecting the water inlet temperature of the heat pump system 800, a second temperature detection device 812 is arranged at a water outlet of the water side heat exchanger 808 and used for detecting the water outlet temperature of the heat pump system 800, and water is supplied to equipment such as floor heating and the like by the water side 814.

When the outlet water temperature of the heat pump system reaches a temperature threshold, the compressor may stop running, and there are two situations that may cause this to happen:

(1) the indoor temperature of the water use side reaches the set temperature, and the heat output quantity of the water use side is smaller.

For the first situation, after the compressor stops running, the water pump also selects to stop running, so that energy is saved, and meanwhile, the user experience is basically not influenced.

(2) The room temperature of the water using side does not reach the set temperature, and the heat output quantity of the water using side is larger at the moment, but the heat quantity stored by the heat pump system is larger than the heat quantity required by the water using side.

For the second situation, after the compressor stops operating, the water side still outputs a large amount of heat, the water temperature drops quickly, and at the moment, the user experience is worsened due to blind water pump stopping.

As shown in fig. 9, the control method of the heat pump system includes:

step 902: when the outlet water temperature of the heat pump system reaches a temperature threshold value, the compressor stops running;

step 904: recording the inlet water temperature Ti (namely the third inlet water temperature) of the heat pump system, and recording the inlet water temperature Ti after the water pump continues to operate for s seconds_a(i.e., the first inlet water temperature);

step 906: determining a water temperature decrease rate Δ T1 (i.e., a second temperature change rate, where Δ T1 ═ Ti-Ti_a) /s) is greater than or equal to a specified threshold, specifically, as shown in fig. 12, when the determination result is yes, step 908 is executed; if the determination result is negative, go to step 910;

step 908: controlling the water pump to continue to operate and judging Ti_aGreater than or equal to the starting temperature of the compressor, and controlling the operation of the compressor；

Step 910: according to Ti_aDetermining a first pump stopping time (namely a fourth time), and stopping running according to the first pump stopping time;

wherein, as shown in FIG. 10, Ti is obtained_aThen, according to the first pump-off time and Ti_aDetermines a first pump-off duration, in particular at Ti_aWhen the value is less than Ti1, the first pump stopping time is a 1; ti_aWhen the value of (A) is more than Ti1 and less than Ti2, the first pump stop time is a2, and the like, the value of Ti is determined_aComparison with Ti3, Ti4 to obtain first pump stop periods a3, a4, and a 5.

Step 912: after the water pump is determined to be restarted and run for b seconds, the water inlet temperature Ti is recorded_b(i.e., the second feedwater temperature);

step 914: judgment of Ti_bIf the temperature is higher than or equal to the starting temperature of the compressor, if yes, go to step 916; if the determination result is negative, go to step 918;

step 916: controlling the compressor to start, and continuously operating the water pump;

step 918: according to the water temperature drop rate Δ T2 (i.e. the first temperature change rate, wherein Δ T2 ═ Ti_a-Ti_b) (first pump stopping time + b)) judging whether the water pump continuously operates, and if so, executing step 920; if the determination result is negative, go to step 922;

step 920; the starting condition of the compressor is met, and the compressor is started;

step 922; when the operation stopping time is longer than or equal to the second pump stopping time, the water pump is started again;

as shown in fig. 11, determining a second pump off duration of the water pump based on the Δ T2, wherein the second pump off duration is d1 when the Δ T2 is less than T4 by comparing the Δ T2 with T1, T2, T3 and T4; when the Δ T2 is greater than or equal to T4 and less than T3, the second pump deactivation period is d2, and so on, according to the comparison result between Δ T2 and T2 and T1, d3, d4 or the water pump is selected to be continuously operated, wherein the first speed threshold in the application can be selected as T1, and the second speed threshold is T2.

Step 924; and after the water pump is determined to be started again and the water pump is operated for b seconds, recording the inlet water temperature Tic.

After the inlet water temperature Tic is obtained, the steps 914 to 924 are executed to obtain Δ T3 and Δ T4, and the second pump stop time period is determined according to the relationship shown in fig. 11.

Example eight

In an embodiment of the invention, a computer-readable storage medium is proposed, in which a computer program is stored, which, when executed, carries out the steps of the method of controlling a heat pump system according to any one of the preceding claims.

In the description of the present invention, the terms "plurality" or "a plurality" refer to two or more, and unless otherwise specifically limited, the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are merely for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention; the terms "connected," "mounted," "secured," and the like are to be construed broadly and include, for example, fixed connections, removable connections, or integral connections; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the description of the present invention, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In the present invention, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A control method of a heat pump system, characterized in that the heat pump system includes a water pump, the control method of the heat pump system comprising:

determining that the water pump is in an operating state, and acquiring a first water inlet temperature of the heat pump system and a first moment of acquiring the first water inlet temperature;

controlling the water pump to stop and start again to obtain a second inlet water temperature of the heat pump system and a second moment for collecting the second inlet water temperature;

controlling the running state of the water pump according to the first water inlet temperature, the first moment, the second water inlet temperature and the second moment;

controlling the running state of the water pump according to the comparison result of the first temperature change rate and a pre-stored first rate interval;

the first rate interval comprises a first rate threshold and a second rate threshold, wherein the first rate threshold is greater than the second rate threshold;

the step of controlling the operation state of the water pump according to the comparison result between the first temperature change rate and a pre-stored first rate interval specifically includes:

determining that the first temperature change rate is greater than or equal to a first rate threshold value, and controlling the water pump to continue to operate; or

Determining that the first temperature change rate is smaller than the first rate threshold and larger than or equal to the second rate threshold, and controlling the water pump to stop running for a second time and then to start again; or

Determining that the first temperature change rate is smaller than the second rate threshold, and controlling the water pump to stop running for a third time and then to start again;

wherein the second duration is less than the third duration.

2. The method for controlling a heat pump system according to claim 1, wherein the step of controlling the operation state of the water pump according to the first intake water temperature, the first time, the second intake water temperature, and the second time specifically comprises:

determining a first water inlet temperature difference according to the first water inlet temperature and the second water inlet temperature;

determining a first time length according to the first time and the second time;

and determining the first temperature change rate according to the first water inlet temperature difference and the first time length.

3. The control method of the heat pump system according to claim 1 or 2, wherein the heat pump system further includes a compressor, the control method of the heat pump system further includes:

comparing the second inlet water temperature with a start-up temperature of the compressor;

determining that the second inlet water temperature is greater than or equal to the starting temperature of the compressor, and executing the step of controlling the running state of the water pump according to the first inlet water temperature, the first moment, the second inlet water temperature and the second moment; or

And determining that the second inlet water temperature is lower than the starting temperature of the compressor, and controlling the compressor and the water pump to start.

4. The method of claim 3, wherein before the steps of determining that the water pump is in an operating state, obtaining a first inlet water temperature of the heat pump system, and acquiring a first time of the first inlet water temperature, the method further comprises:

acquiring a third inlet water temperature of the heat pump system and a third moment for acquiring the third inlet water temperature;

the step of controlling the water pump to stop and restart specifically comprises:

determining the running state of the water pump according to the first water inlet temperature, the first moment, the third water inlet temperature and the third moment;

and determining that the shutdown time of the water pump is greater than or equal to a fourth time, and controlling the water pump to be started again.

5. The method for controlling a heat pump system according to claim 4, wherein the step of determining the operation state of the water pump based on the first intake water temperature, the first time, the third intake water temperature, and the third time specifically includes:

determining a second inlet water temperature difference according to the first inlet water temperature and the third inlet water temperature;

determining a fifth time length according to the first time and the third time;

determining a second temperature change rate according to the second water inlet temperature difference and the fifth time length;

and controlling the running state of the water pump according to the comparison result of the second temperature change rate and a pre-stored specified threshold value.

6. The method for controlling the heat pump system according to claim 5, wherein the step of controlling the operation state of the water pump according to the comparison result of the second temperature change rate and a pre-stored specified threshold specifically comprises:

determining that the second temperature change rate is greater than or equal to the specified threshold value, and controlling the water pump to operate; or

And determining that the second temperature change rate is smaller than the specified threshold value, and controlling the water pump to stop running.

7. The method of claim 4, wherein the step of controlling the operating state of the water pump according to the first intake water temperature, the first time, the second intake water temperature, and the second time is followed by the step of:

determining that the water pump operates again, and acquiring a fourth water inlet temperature of the heat pump system and a fourth moment for acquiring the fourth water inlet temperature;

and determining the running state of the water pump according to the second water inlet temperature, the second moment, the fourth water inlet temperature and the fourth moment.

8. The method for controlling a heat pump system according to claim 7, wherein the step of determining the operating state of the water pump according to the second intake water temperature, the second time, the fourth intake water temperature, and the fourth time specifically includes:

determining a third water inlet temperature difference according to the second water inlet temperature and the fourth water inlet temperature;

determining a sixth time length according to the second time and the fourth time;

determining a third temperature change rate according to the third water inlet temperature difference and the sixth time length;

and controlling the running state of the water pump according to the comparison result of the third temperature change rate and a pre-stored second rate interval.

9. The control method of the heat pump system according to claim 8, wherein the second rate interval includes a third rate threshold and a fourth rate threshold, wherein the third rate threshold is greater than the fourth rate threshold;

the step of controlling the operation state of the water pump according to the comparison result between the third temperature change rate and a pre-stored second rate interval specifically includes:

determining that the third temperature change rate is greater than or equal to a third rate threshold value, and controlling the water pump to continue to operate; or

Determining that the third temperature change rate is smaller than the third speed threshold and greater than or equal to the fourth speed threshold, and controlling the water pump to stop running for a seventh time and then to start again; or

Determining that the third temperature change rate is smaller than the fourth rate threshold, and controlling the water pump to stop running for an eighth time period and then to start again;

wherein the seventh duration is less than the eighth duration.

10. The control method of the heat pump system according to claim 7, characterized by further comprising:

comparing the fourth inlet water temperature to a start-up temperature of the compressor;

determining that the fourth water inlet temperature is greater than or equal to the starting temperature of the compressor, and executing the step of determining the running state of the water pump according to the second water inlet temperature, the second moment, the fourth water inlet temperature and the fourth moment; or

And determining that the fourth inlet water temperature is lower than the starting temperature of the compressor, and controlling the compressor and the water pump to start.

11. The method for controlling a heat pump system according to claim 3, further comprising, before the steps of determining that the water pump is in an operating state, acquiring a first inlet water temperature of the heat pump system, and acquiring a first time of the first inlet water temperature, the method further comprising:

acquiring the outlet water temperature of a heat pump system;

and determining that the outlet water temperature is greater than or equal to a pre-stored temperature threshold value, and controlling the compressor to stop running.

12. The control method of the heat pump system according to claim 4, characterized by further comprising:

and determining the fourth time length according to the first water inlet temperature.

13. A control device of a heat pump system, characterized by comprising:

a memory and a processor, the memory storing a computer program,

the computer program, when being executed by the processor, realizes the steps of a method of controlling a heat pump system according to any one of claims 1 to 12.

14. A heat pump system, comprising:

a compressor;

a water pump;

a control device of a heat pump system according to claim 13, said control device of said heat pump system being connected to said compressor and said water pump, said control device of said heat pump system being configured to control operation of said compressor and said water pump.

15. A computer-readable storage medium, comprising:

the computer-readable storage medium has stored therein a computer program which, when executed, implements the steps of a method of controlling a heat pump system according to any one of claims 1 to 12.