Water pump control method and device, heat pump water supply system, electronic equipment and medium

Abstract

The application discloses a water pump control method and device, a heat pump water supply system, electronic equipment and a medium. The heat pump water supply system comprises a host, a buffer water tank and at least one terminal, a first water pump is arranged on a return water pipeline of the host, and a second water pump is arranged on a total water inlet pipeline of the at least one terminal. The method comprises the following steps: in response to an identification instruction, the first water pump is controlled to run at a highest gear, and the second water pump is closed; whether the type of the heat pump water supply system is a primary water system or a secondary water system is identified according to whether water flow switch protection and water tank temperature variation rate appear; and the gear of the first water pump is controlled according to terminal load variation, the type of the heat pump water supply system and a host inlet and outlet water temperature difference. The application can automatically identify the type of the water system, automatically adopt a suitable control strategy for the first water pump based on terminal load variation and the type of the water system in a running process, and control according to the host inlet and outlet water temperature difference, so that the control is intelligent and more accurate, and system parameters do not need to be manually configured.

Description

Technical Field

[0001] This invention relates to the field of heat pump water supply system technology, and more specifically, to a water pump control method, device, heat pump water supply system, electronic equipment, and medium. Background Technology

[0002] A heat pump water supply system can supply hot or cold water to the user side. The main unit produces hot or cold water through refrigerant circulation and supplies it to the user's water system. The user's water system can be connected in two ways: a primary water system and a secondary water system.

[0003] like Figure 1 The diagram shows a primary water system. The main components include: a compressor 11, a four-way valve 12, a first heat exchanger 13 (which can be a plate heat exchanger), a second heat exchanger 14 (which can be a finned heat exchanger), a gas-liquid separator 15, and a first water pump 16. Only the main components of the main system are shown in the diagram; other components, such as the throttling element between the two heat exchangers, are not shown. Taking heating as an example, the high-temperature, high-pressure refrigerant discharged from the compressor 11 enters the first heat exchanger 13 through the four-way valve 12 for heat exchange, transferring the heat of the refrigerant to the water. The refrigerant flowing out of the first heat exchanger 13 is throttled and enters the second heat exchanger 14 for evaporation. Afterward, it enters the gas-liquid separator 15 through the four-way valve 12. The refrigerant returns to the compressor 11 after exiting the gas-liquid separator 15 for recompression, forming a heating cycle. The user-side water system includes: a buffer tank 21, at least one terminal (e.g., a fan coil unit 22, or underfloor heating 23), and a second water pump 24. A water heater 231 can also be installed at the underfloor heating 23. The first water pump 16 is located on the return water pipe of the main unit and is used to drive water circulation. The second water pump 24 is located on the main inlet water pipe of the at least one terminal. The first water pump 16 is integrated into the main unit, while the second water pump 24 is installed separately according to specific project requirements. In the primary water system, a buffer tank 21 can be installed on the return water pipe or the supply water pipe of the main unit, which increases the system water capacity. In the primary water system, hot or cold water drawn by the main unit can be directly supplied to the terminal, and the water returning from the terminal returns to the main unit, realizing direct supply of hot / cold water.

[0004] like Figure 2 The diagram shows a secondary water system, which includes two water circulation loops: the main unit and the buffer tank 21 form one water circulation loop, and the buffer tank 21 and the terminal form another water circulation loop.

[0005] Currently, the host adopts the same control strategy and parameter threshold for the first water pump 16 for different water system types, which may cause inaccurate control. For example, for a primary water system, the water flow switch protection is triggered when the first water pump 16 is in gear 1, and for a secondary water system, the water flow switch protection is triggered when the first water pump 16 is in gear 2. Due to the characteristics of the water system type, gear 1 is greater than gear 2. If the water flow corresponding to gear 1 is uniformly used as the threshold for triggering the water flow switch protection, the secondary water system will trigger the water flow switch protection in advance, affecting normal operation. If the water flow corresponding to gear 2 is uniformly used as the threshold for triggering the water flow switch protection, the primary water system cannot trigger the water flow switch protection in time, which is easy to damage the equipment.

[0006] When the host controls the operation of the first water pump 16, it mainly relies on the water system parameters detected by the sensor, such as water flow, temperature, and pressure. The water flow, temperature, and pressure of the above-mentioned primary water system and secondary water system may be very similar. Therefore, according to the current sensor accuracy, it is impossible to automatically and accurately distinguish whether the host is currently connected to the primary water system or the secondary water system by relying on the parameters detected by the sensor. Instead, the system parameters need to be manually configured after the installation of the heat pump water supply system, which is cumbersome.

[0007] Currently, there is no effective solution to the problem that the control of the heat pump water supply system in the prior art is not intelligent and accurate. SUMMARY

[0008] Embodiments of the present application provide a water pump control method, device, heat pump water supply system, electronic device and medium to at least solve the problem that the control of the heat pump water supply system in the prior art is not intelligent and accurate.

[0009] To solve the above technical problems, the embodiments of the present application provide a water pump control method applied to a heat pump water supply system, wherein the heat pump water supply system comprises a host, a buffer water tank and at least one terminal, a first water pump is arranged on a return water pipeline of the host, and a second water pump is arranged on a total water inlet pipeline of the at least one terminal. The water pump control method comprises the following steps:

[0010] In response to an identification instruction, the first water pump is controlled to run at the highest gear, and the second water pump is turned off;

[0011] The type of the heat pump water supply system is identified according to whether water flow switch protection and water tank temperature change rate occur, wherein the type is a primary water system or a secondary water system;

[0012] The gear of the first water pump is controlled according to terminal load change, the type of the heat pump water supply system and host inlet and outlet water temperature difference.

[0013] Optionally, the type of the heat pump water supply system is identified according to whether water flow switch protection occurs and a water tank temperature variation rate, comprising:

[0014] determining whether water flow switch protection occurs;

[0015] if the water flow switch protection occurs, determining that the type of the heat pump water supply system is a primary water system;

[0016] if the water flow switch protection does not occur, identifying the type of the heat pump water supply system according to the water tank temperature variation rate.

[0017] Optionally, the type of the heat pump water supply system is identified according to the water tank temperature variation rate, comprising:

[0018] obtaining a water tank temperature variation rate within a preset time;

[0019] if the water tank temperature variation rate is less than or equal to a preset rate, determining that the type of the heat pump water supply system is a primary water system;

[0020] if the water tank temperature variation rate is greater than the preset rate, determining that the type of the heat pump water supply system is a secondary water system.

[0021] Optionally, after the type of the heat pump water supply system is identified according to whether water flow switch protection occurs and a water tank temperature variation rate, the method further comprises:

[0022] resuming the second water pump to run at a preset gear;

[0023] periodically obtaining a main machine in-out water temperature difference, if the main machine in-out water temperature difference is greater than or equal to a first threshold, increasing a gear of the first water pump, if the main machine in-out water temperature difference is less than a second threshold, decreasing the gear of the first water pump, and if the main machine in-out water temperature difference is greater than or equal to the second threshold and less than the first threshold, keeping a current gear of the first water pump unchanged, so as to make the first water pump run stably.

[0024] wherein, the main machine in-out water temperature difference is an absolute value of a difference between a main machine out water temperature and a main machine in water temperature.

[0025] Optionally, the gear of the first water pump is controlled according to an end load change, the type of the heat pump water supply system and a main machine in-out water temperature difference, comprising:

[0026] when detecting that the end load changes, determining a target control strategy corresponding to the type of the heat pump water supply system, and controlling the gear of the first water pump according to the main machine in-out water temperature difference according to the target control strategy;

[0027] when detecting that the end load changes, controlling the gear of the first water pump according to the main machine in-out water temperature difference according to a preset control strategy.

[0028] Optionally, the step of controlling the gear of the first water pump according to the host inlet-outlet water temperature difference under the target control strategy comprises:

[0029] If the type of the heat pump water supply system is a primary water system, periodically acquiring the host inlet-outlet water temperature difference, if the host inlet-outlet water temperature difference is greater than or equal to a first threshold, increasing the gear of the first water pump, if the host inlet-outlet water temperature difference is less than the first threshold, keeping the current gear of the first water pump unchanged;

[0030] If the type of the heat pump water supply system is a secondary water system, periodically acquiring the host inlet-outlet water temperature difference, if the host inlet-outlet water temperature difference is greater than or equal to the first threshold, increasing the gear of the first water pump, if the host inlet-outlet water temperature difference is less than a second threshold, decreasing the gear of the first water pump, if the host inlet-outlet water temperature difference is greater than or equal to the second threshold and less than the first threshold, keeping the current gear of the first water pump unchanged.

[0031] Optionally, after decreasing the gear of the first water pump, the method further comprises:

[0032] judging whether water flow switch protection occurs in the circulating loop in which the first water pump is located;

[0033] If water flow switch protection occurs, restoring the first water pump to the gear before the decrease and setting the gear before the decrease as the allowed minimum gear of the first water pump.

[0034] Optionally, the step of controlling the gear of the first water pump according to the host inlet-outlet water temperature difference under the preset control strategy comprises:

[0035] periodically acquiring the host inlet-outlet water temperature difference;

[0036] if the host inlet-outlet water temperature difference is greater than or equal to a first threshold, increasing the gear of the first water pump;

[0037] if the host inlet-outlet water temperature difference is less than the first threshold, keeping the current gear of the first water pump unchanged.

[0038] The embodiment of the application further provides a water pump control device applied to a heat pump water supply system, wherein the heat pump water supply system comprises a host, a buffer water tank and at least one terminal, a first water pump is arranged on a return water pipeline of the host, and a second water pump is arranged on a total inlet water pipeline of the at least one terminal, and the water pump control device comprises:

[0039] a first control module, used for controlling the first water pump to run at a highest gear and closing the second water pump in response to an identification instruction;

[0040] The identification module is configured to identify the type of the heat pump water supply system according to whether water flow switch protection and water tank temperature variation rate occur, wherein the type is a primary water system or a secondary water system.

[0041] The second control module is configured to control the gear of the first water pump according to end load variation, the type of the heat pump water supply system and main machine in-out water temperature difference.

[0042] The embodiment of the present application further provides a heat pump water supply system, comprising the water pump control device.

[0043] The embodiment of the present application further provides an electronic device, comprising a memory, a processor and a computer program stored in the memory and executable on the processor, and the processor implements the water pump control method when executing the computer program.

[0044] The embodiment of the present application further provides a non-volatile computer readable storage medium, which stores a computer program, and the computer program is executed by a processor to implement the water pump control method.

[0045] The technical scheme of the present application controls the first water pump to run at the highest gear and the second water pump to be closed, and under this specific control, the water system type can be automatically and accurately identified according to whether water flow switch protection and water tank temperature variation rate occur, and then during system operation, appropriate gear control strategies are automatically adopted for the first water pump based on end load variation and water system type, and under the specific gear control strategy, specific control is performed according to main machine in-out water temperature difference, so that improper control caused by misjudgment is avoided, the control is intelligent and more accurate, the self-adaptive intelligent and accurate control of the heat pump water supply system is realized, the stability, energy efficiency and adaptability of the system are improved, the user does not need to manually configure complex system parameters, the operation process is simplified, and the user experience is improved, since the system runs more stably, the failure rate is reduced, and the maintenance cost is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0046] Figure 1 is a schematic diagram of a primary water system of the prior art;

[0047] Figure 2 is a schematic diagram of a secondary water system of the prior art;

[0048] Figure 3 is a flowchart of the water pump control method provided by the embodiment of the present application;

[0049] Figure 4 is a schematic diagram of water tank temperature variation with time of a primary water system and a secondary water system provided by the embodiment of the present application;

[0050] Figure 5is a flow chart of identifying water system type provided by the embodiment of the present application;

[0051] Figure 6 is a control flow chart of entering stable operation after water pump initialization is completed provided by the embodiment of the present application;

[0052] Figure 7 is a first water pump control flow chart when end load is reduced provided by the embodiment of the present application;

[0053] Figure 8 is a first water pump control flow chart when end load is increased provided by the embodiment of the present application;

[0054] Figure 9 is a structure block diagram of water pump control device provided by the embodiment of the present application;

[0055] Figure 10 is a hardware structure schematic diagram of electronic equipment provided by the embodiment of the present application. DETAILED DESCRIPTION

[0056] In order to make the objects, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0057] It should be noted that the terms "first", "second" and the like in the description and claims of the present application and the drawings are used to distinguish similar objects, and do not necessarily indicate a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in other than the order illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device that includes a series of steps or units does not necessarily limit to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0058] It should be noted that the steps shown in the flow chart of the drawings can be executed in a computer system such as a set of computer executable instructions, and although the logical order is shown in the flow chart, in some cases, the steps shown or described herein can be executed in an order different from that described herein.

[0059] It should be understood that the term "and / or" as used herein merely describes an associated relationship, which means that there can be three relationships, for example, A and / or B, which means that A exists alone, A and B exist together, and B exists alone. In addition, the character " / " herein generally represents an "or" relationship between the front and rear associated objects.

[0060] The optional embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0061] Embodiment 1

[0062] The embodiment provides a water pump control method, which is applied to a heat pump water supply system, the heat pump water supply system comprising a host, a buffer water tank and at least one terminal, a first water pump being arranged on a return water pipeline of the host, and a second water pump being arranged on a total water inlet pipeline of the at least one terminal. For details, refer to Figure 1 and Figure 2 .

[0063] Figure 3 is a flowchart of the water pump control method provided by the embodiment of the present application, as Figure 3 shown, the method comprises the following steps:

[0064] S301, in response to an identification instruction, controlling the first water pump to run at a highest gear and closing the second water pump.

[0065] S302, identifying the type of the heat pump water supply system according to whether water flow switch protection and water tank temperature variation rate occur, wherein the type is a primary water system or a secondary water system.

[0066] S303, controlling the gear of the first water pump according to terminal load variation, the type of the heat pump water supply system and host water inlet and outlet temperature difference.

[0067] The type of the heat pump water supply system refers to the type of the water system connected with the system host. The identification instruction is used to indicate the start of identification of the type of the water system connected with the host, for example, the type of the water system needs to be automatically identified when the host is powered on for the first time, or the type of the water system needs to be re-identified after the type of the water system changes. The identification instruction can be automatically issued when the condition is met, or can be issued by the user through the operation of a preset button. For example, when the host is powered on for the first time, the first water pump and the second water pump are respectively opened to the initial gears of the first water pump and the second water pump, and the first water pump and the second water pump continue to run for a certain time (for example, 10 minutes), and the water system enters a stable state, at this time, it is equivalent to that there is an identification instruction, and the type of the water system can be identified.

[0068] The water circulation loop is provided with a water flow switch, which automatically triggers protection when detecting abnormal water flow, for example, triggering the water flow switch protection when the water flow is lower than the preset value or there is no water, at which time the machine is stopped to avoid damage to the equipment due to insufficient water flow. The water tank temperature change rate refers to the change rate of the water temperature in the buffer water tank. Under the specific control that the first water pump runs at the highest gear and the second water pump is closed, the water flow switch protection conditions of the primary water system and the secondary water system and the water tank temperature change rate are different, so the embodiment can automatically and accurately identify the water system type based on the different characteristics of the primary water system and the secondary water system under the specific control.

[0069] The terminal load change refers to the increase or decrease of the terminal load, for example, the decrease of the terminal load due to the shutdown of the terminal part of the equipment, the increase of the terminal load due to the opening of the terminal part of the equipment, and the increase or decrease of the terminal load due to the adjustment of the target temperature of the terminal equipment. The host water inlet and outlet temperature difference is the absolute value of the difference between the host water outlet temperature and the host water inlet temperature, specifically the absolute value of the difference between the outlet temperature and the inlet temperature of the heat exchanger in the host that exchanges heat with the water system, so as to Figure 1 and Figure 2 For example, ΔT = |T 出 -T 进 |, ΔT represents the host water inlet and outlet temperature difference, T 出 represents the outlet temperature of the first heat exchanger, and T 进 represents the inlet temperature of the first heat exchanger. After the embodiment identifies the water system type, during the system operation, the appropriate gear control strategy for the first water pump is automatically adopted based on the terminal load change and the water system type, and specific control is performed under the specific gear control strategy according to the host water inlet and outlet temperature difference, which is intelligent and more accurate.

[0070] The embodiment controls the first water pump to run at the highest gear and closes the second water pump, and under this specific control, the water system type can be automatically and accurately identified according to whether the water flow switch protection and the water tank temperature change rate occur, and then during the system operation, the appropriate gear control strategy for the first water pump is automatically adopted based on the terminal load change and the water system type, and specific control is performed under the specific gear control strategy according to the host water inlet and outlet temperature difference, which avoids improper control due to misjudgment, is intelligent and more accurate, realizes self-adaptive intelligent and accurate control of the heat pump water supply system, improves the stability, energy efficiency and adaptability of the system, and simplifies the operation process and improves the user experience without manual configuration of complex system parameters. Since the system runs more stably, the failure rate is reduced, and the maintenance cost is reduced.

[0071] In an optional embodiment, the type of the heat pump water supply system is identified according to whether the water flow switch protection occurs and the water tank temperature variation rate, including: determining whether the water flow switch protection occurs; if the water flow switch protection occurs, determining that the type of the heat pump water supply system is a primary water system; and if the water flow switch protection does not occur, identifying the type of the heat pump water supply system according to the water tank temperature variation rate.

[0072] With reference to Figure 2 , the end device of the secondary water system is connected in parallel with the buffer tank, and the first water pump only needs to overcome the head between the buffer tank and the main machine. Under the specific control that the first water pump runs at the highest gear and the second water pump is closed, the secondary water system will not report the water flow switch protection. With reference to Figure 1 , the end device of the primary water system is connected in series with the buffer tank, and the required head is larger. Under the specific control that the first water pump runs at the highest gear and the second water pump is closed, the first water pump may not meet the required head of the primary water system, and the water flow switch protection is easily caused. Therefore, under the specific control that the first water pump runs at the highest gear and the second water pump is closed, if the water flow switch protection occurs, it can be determined that the main machine is connected to the primary water system.

[0073] The embodiment can automatically and accurately identify the type of the water system. Under the specific control that the first water pump runs at the highest gear and the second water pump is closed, if the water flow switch protection occurs, it is directly determined that the type of the water system is the primary water system. If the water flow switch protection does not occur, the type of the water system is further identified according to the water tank temperature variation rate.

[0074] Further, the type of the heat pump water supply system is identified according to the water tank temperature variation rate, including: obtaining the water tank temperature variation rate within a preset time; if the water tank temperature variation rate is less than or equal to a preset rate, determining that the type of the heat pump water supply system is a primary water system; and if the water tank temperature variation rate is greater than the preset rate, determining that the type of the heat pump water supply system is a secondary water system.

[0075] The preset time is a time length for calculating the water tank temperature variation rate, and the preset time can be set according to actual conditions, for example, the preset time is set to 60 seconds. The preset rate can be an empirical value or obtained through experimental tests, and the preset rate of different systems can be different.

[0076] If the host is heating, the water tank temperature rising rate is obtained, and if the host is cooling, the water tank temperature falling rate is obtained. There are various ways to obtain the water tank temperature changing rate, for example, the water tank temperature is collected once every preset time t, and the water tank temperature changing rate in t time is calculated as |T2-T1| / t, where T2 represents the current collected water tank temperature, and T1 represents the water tank temperature collected before t time; or, for example, the water tank temperature is collected in real time within preset time t, the average temperature in the first t / 2 time is calculated as T1', the average temperature in the second t / 2 time is calculated as T2', and the water tank temperature changing rate in t time is calculated as |T2'-T1'| / t.

[0077] Reference Figure 1 The buffer water tank of the primary water system is connected in series with the host and the terminal, and the heat / cold generated by the host circulates in the large loop formed by the host and the terminal under the action of the first water pump. Reference Figure 2 For the secondary water system, when the second water pump is closed and only the first water pump is running, the heat / cold generated by the host can be approximately considered to circulate only in the small loop formed by the host and the buffer water tank. Considering that the shorter the circulating loop is, the less the heat / cold is lost in the circulating process, therefore, under the condition that the same host heating / cooling capacity and terminal load are unchanged, when the second water pump is closed and only the first water pump is running, the water tank temperature changing rate of the primary water system is less than that of the secondary water system. Reference Figure 4 The above line is the secondary water system, and the lower line is the primary water system.

[0078] The embodiment can automatically and accurately identify the water system type according to the water tank temperature changing rate under the specific control that the first water pump runs at the highest gear and the second water pump is closed without the occurrence of water flow switch protection.

[0079] Preferably, before the first water pump is controlled to run at the highest gear and the second water pump is closed, the first water pump is ensured to run continuously for a certain time, so as to stabilize the water system, which is more conducive to subsequent identification and improves the reliability of identification.

[0080] The embodiment of the application identifies the water system type by performing specific control (i.e., controlling the first water pump to run at the highest gear and closing the second water pump), and after identifying the water system type, the normal operation of the first water pump and the second water pump needs to be restored.

[0081] Specifically, after identifying the type of the heat pump water supply system according to whether the water flow switch protection occurs and the water tank temperature changing rate, the method further comprises:

[0082] resuming the second water pump to run at a preset gear;

[0083] periodically acquiring the host inlet-outlet water temperature difference, if the host inlet-outlet water temperature difference is greater than or equal to a first threshold value, increasing the gear of the first water pump; if the host inlet-outlet water temperature difference is less than a second threshold value, decreasing the gear of the first water pump; if the host inlet-outlet water temperature difference is greater than or equal to the second threshold value and less than the first threshold value, keeping the current gear of the first water pump unchanged; so as to stabilize the operation of the first water pump.

[0084] The preset gear can be the highest gear, the initial gear or other feasible gears. In order to make the system recover normal operation at the fastest speed, the preset gear is preferably the highest gear of the second water pump. The period of acquiring the host inlet-outlet water temperature difference can be set according to actual conditions, for example, 60 seconds. The first threshold value and the second threshold value can be set according to actual conditions, for example, the first threshold value is set to 8℃ and the second threshold value is set to 2.5℃. If the host inlet-outlet water temperature difference is greater than or equal to the first threshold value, it means that the host inlet water temperature and the host outlet water temperature differ greatly, and the demand is large, so the gear of the first water pump is increased to meet the demand as soon as possible. If the host inlet-outlet water temperature difference is less than the second threshold value, it means that the host inlet water temperature and the host outlet water temperature differ less, and the demand is small, so the gear of the first water pump is decreased to save energy. The amplitude of increasing or decreasing the gear of the first water pump can be set according to actual conditions, for example, increasing one gear at a time or increasing two gears at a time, etc.

[0085] After identifying the type of water system, the first water pump and the second water pump are recovered from the specific control state to normal operation in this embodiment, so as to stabilize the operation of the first water pump, and then appropriate gear control strategies for the first water pump can be automatically adopted based on the change of the terminal load and the type of water system during the operation of the system.

[0086] The heat formula Q = cm△t, Q represents the heat that needs to be absorbed (or released) by an object when the temperature of the object increases (or decreases), c represents the specific heat capacity of the object, m represents the mass of the object, and△t represents the temperature change value of the object.

[0087] For the water path where the host is located in the primary water system, when Q decreases (indicating that the terminal load becomes smaller), in order to ensure that△t remains unchanged (for example, the temperature difference is guaranteed to be 5℃-8℃, which is conducive to the frequency control of the compressor and achieves the energy saving effect), m needs to be reduced, that is, the first water pump needs to be downshifted. However, the downshift of the first water pump is easy to cause the water flow switch protection, therefore, when the terminal load becomes smaller, the primary water system should ensure that the operation is prioritized, that is, the first water pump is not allowed to be downshifted, but only allowed to maintain the current gear or increase the gear.

[0088] For the water route where the main engine of the secondary water system is located, when Q decreases (indicating that the terminal load becomes smaller), to ensure that At remains unchanged (the temperature difference is guaranteed to be 5-8℃, which is conducive to the frequency control of the compressor and achieves the energy-saving effect), m needs to be reduced, m is directly related to the first water pump gear, the water pump gear is in a positive relationship with the water flow, the larger the gear, the larger the water flow. At this time, the possibility of water flow switch protection of the secondary water system is very small, and the first water pump should be downshifted under the condition of meeting the conditions.

[0089] Specifically, the gear of the first water pump is controlled according to the terminal load change, the type of the heat pump water supply system, and the temperature difference between the inlet and outlet of the main engine, comprising:

[0090] When it is detected that the terminal load becomes smaller, a target control strategy corresponding to the type of the heat pump water supply system is determined, and the gear of the first water pump is controlled according to the temperature difference between the inlet and outlet of the main engine according to the target control strategy;

[0091] When it is detected that the terminal load becomes larger, the gear of the first water pump is controlled according to the temperature difference between the inlet and outlet of the main engine according to a preset control strategy.

[0092] The embodiment changes the gear control strategy of the first water pump according to the terminal load change and the type of the water system, adopts a suitable gear control strategy to control the first water pump according to the actual situation of the system, adjusts the gear of the first water pump in real time and accurately, and realizes the adaptive automatic control adjustment of the first water pump. For the case where the terminal load becomes smaller, the first water pump of the primary water system and the secondary water system is respectively provided with a corresponding control strategy, and in the actual operation process of the system, when it is detected that the terminal load becomes smaller, the corresponding control strategy is selected according to the identified type of the water system to control the gear of the first water pump; for the case where the terminal load becomes larger, the first water pump of the primary water system and the secondary water system adopts the same control strategy.

[0093] In the case where it is detected that the terminal load becomes smaller, the gear of the first water pump is controlled according to the temperature difference between the inlet and outlet of the main engine according to the target control strategy, comprising:

[0094] If the type of the heat pump water supply system is a primary water system, the temperature difference between the inlet and outlet of the main engine is periodically acquired, if the temperature difference between the inlet and outlet of the main engine is greater than or equal to a first threshold, the gear of the first water pump is increased, and if the temperature difference between the inlet and outlet of the main engine is less than the first threshold, the current gear of the first water pump remains unchanged;

[0095] If the type of the heat pump water supply system is a secondary water system, periodically acquire the main machine inlet and outlet water temperature difference, if the main machine inlet and outlet water temperature difference is greater than or equal to the first threshold, increase the gear of the first water pump; if the main machine inlet and outlet water temperature difference is less than the second threshold, reduce the gear of the first water pump; if the main machine inlet and outlet water temperature difference is greater than or equal to the second threshold and less than the first threshold, keep the current gear of the first water pump unchanged.

[0096] The embodiment controls the gear of the first water pump according to different water systems when the terminal load becomes small, and realizes automatic and accurate adjustment of the first water pump.

[0097] Further, for the secondary water system, after reducing the gear of the first water pump, it further includes: judging whether the circulating loop where the first water pump is located appears water flow switch protection; if the water flow switch protection appears, restoring the first water pump to the gear before reduction, and setting the gear before reduction as the allowed minimum gear of the first water pump.

[0098] In the embodiment, if the water flow switch protection appears after reducing the gear of the first water pump, it indicates that the gear before reduction is the minimum gear that does not cause the water flow switch protection, so the first water pump is restored to the gear before reduction to remove the water flow switch protection and ensure normal operation of the system, and the gear before reduction is set as the allowed minimum gear of the first water pump.

[0099] In the case of detecting that the terminal load becomes large, the gear of the first water pump is controlled according to the main machine inlet and outlet water temperature difference according to a preset control strategy, including: periodically acquiring the main machine inlet and outlet water temperature difference; if the main machine inlet and outlet water temperature difference is greater than or equal to the first threshold, increasing the gear of the first water pump; if the main machine inlet and outlet water temperature difference is less than the first threshold, keeping the current gear of the first water pump unchanged.

[0100] In the embodiment, in the case of detecting that the terminal load becomes large, the same control strategy is adopted to control the gear of the first water pump whether it is a primary water system or a secondary water system, and automatic and accurate adjustment of the first water pump is realized.

[0101] Embodiment 2

[0102] On the basis of the above-mentioned embodiments, the embodiment provides a specific implementation of the water pump control method of the heat pump water supply system. The same or corresponding terms are explained as in the above-mentioned embodiments, and the embodiment will not be described again.

[0103] The above-described water pump control method will be described below with reference to a specific embodiment. However, it is worth noting that this specific embodiment is only for better illustration of this application and does not constitute an improper limitation of this application. This application mainly focuses on controlling the first water pump that comes with the host machine. The second water pump is equipped by the project itself. After identifying the water system type, the second water pump can operate at a preset speed or adjust the speed according to user needs. This application will not discuss or limit this aspect.

[0104] like Figure 5 The flowchart shown below illustrates the process for identifying water system types, including the following steps:

[0105] S501, when the system is powered on, after the water pumps receive the start command, the first water pump runs at its initial speed, and the second water pump runs at its initial speed.

[0106] S502, the water system stabilized after the water pump ran for 10 minutes.

[0107] S503, the main unit's centralized control board sends a signal to shut down the second water pump and make the first water pump run at its highest speed.

[0108] S504: Determine if the water flow switch protection is active. If yes, proceed to S505; otherwise, proceed to S506.

[0109] S505, the water pump control board identifies it as a primary water system.

[0110] S506, the first water pump maintains the highest speed for 60 seconds and collects the water tank temperature in real time to calculate the water tank temperature change rate R.

[0111] S507, determine whether R≤a is satisfied. If yes, proceed to S508; otherwise, proceed to S509.

[0112] S508, the water pump control board identifies it as a primary water system.

[0113] S509, the water pump control board identifies it as a secondary water system.

[0114] S510, the main unit's centralized control board sends a signal to control the second water pump to resume operation at the preset speed.

[0115] S511, water pump initialization complete.

[0116] like Figure 6 The diagram shown illustrates the control flowchart for the water pump to enter stable operation after initialization, including the following steps:

[0117] S601, water pump initialization complete, at which point the first water pump is running at its highest speed.

[0118] S602, periodically obtain the temperature difference ΔT between the inlet and outlet water of the main unit.

[0119] S603, if △T < 2.5℃, the first water pump is lowered by one gear.

[0120] S604, if △T≥8℃, the first water pump is raised by one gear, for example, the highest is 10 gears.

[0121] S605, if 2.5℃≤△T<8℃, the first water pump gear remains unchanged.

[0122] S606, the first water pump is stably operated according to the current gear.

[0123] S607, if the end load change is detected, the corresponding process is executed.

[0124] As shown in FIG. 6, it is a first water pump control flow chart when the end load is reduced, including the following steps: Figure 7

[0125] S701, the end load is detected to be smaller, if it is a primary water system, S702 is entered, if it is a secondary water system, S705 is entered.

[0126] S702, the main machine inlet and outlet water temperature difference △T is obtained once every 60s.

[0127] S703, if △T<8℃, the first water pump gear remains unchanged.

[0128] S704, if △T≥8℃, the first water pump is raised by one gear.

[0129] S705, the main machine inlet and outlet water temperature difference △T is obtained once every 60s.

[0130] S706, if △T<2.5℃, the first water pump is lowered by one gear.

[0131] S707, it is judged whether the water flow switch protection occurs, if yes, S708 is entered, if no, S705 is returned.

[0132] S708, the first water pump is restored to the last gear, and the last gear is set as the allowed minimum gear of the first water pump (the minimum gear limit can be manually restored).

[0133] S709, if 2.5≤△T<8℃, the first water pump gear remains unchanged.

[0134] S710, if △T≥8℃, the first water pump is raised by one gear.

[0135] As shown in FIG. 7, it is a first water pump control flow chart when the end load is increased, including the following steps: Figure 8

[0136] S801, the end load is detected to be larger. ​​

[0137] S802, obtain the temperature difference △T between the inlet and outlet water of the host machine every 60s.

[0138] S803, if △T < 8℃, the first water pump keeps the current gear.

[0139] S804, if △T ≥ 8℃, the first water pump is adjusted to a higher gear.

[0140] In the embodiment, the water pump has the function of automatically identifying the type of water system, can automatically and accurately identify whether the connected user side is a primary water system or a secondary water system, and then take appropriate control strategy according to the characteristics of the water system to adjust the water pump, realize accurate control of the water pump, reduce the false triggering of the water flow switch protection, and enhance the adaptability of the system. During the initialization process of the water pump, the water pump automatically adapts to the customer's water system, adjusts the water pump gear in real time according to the actual situation of the system, ensures the safe start and stable operation of the unit, ensures the safe operation of the entire system, maintains the balance and stable operation of the system, and improves the energy efficiency of the system and reduces energy consumption. The user does not need to manually configure complex system parameters, and the water pump can automatically identify and adjust, simplifying the operation process and improving the user experience. Since the system runs more stably, the failure rate is reduced, and the maintenance cost is reduced.

[0141] Embodiment 3

[0142] Based on the same inventive concept, the embodiment provides a water pump control device applied to a heat pump water supply system, the heat pump water supply system comprising a host machine, a buffer water tank and at least one terminal, a first water pump being arranged on a return water pipeline of the host machine, and a second water pump being arranged on a total inlet water pipeline of the at least one terminal. The water pump control device can be used to realize the water pump control method described in the above embodiments. The water pump control device can be realized by software and / or hardware, and the water pump control device can generally be integrated into a controller of the host machine of the heat pump water supply system.

[0143] Figure 9 is a structural block diagram of the water pump control device provided by the embodiment of the present application, as shown in Figure 9 the water pump control device comprises:

[0144] a first control module 91, configured to control the first water pump to run at the highest gear and close the second water pump in response to an identification instruction;

[0145] an identification module 92, configured to identify the type of the heat pump water supply system according to whether the water flow switch protection and the water tank temperature variation rate appear, wherein the type is a primary water system or a secondary water system;

[0146] a second control module 93, configured to control the gear of the first water pump according to the terminal load variation, the type of the heat pump water supply system and the temperature difference △T between the inlet and outlet water of the host machine.

[0147] Optionally, the identification module 92 comprises:

[0148] a judging unit configured to judge whether water flow switch protection occurs;

[0149] a determining unit configured to determine that the type of the heat pump water supply system is a primary water system if the water flow switch protection occurs;

[0150] an identification unit configured to identify the type of the heat pump water supply system according to the water tank temperature variation rate if the water flow switch protection does not occur.

[0151] Optionally, the identification unit comprises:

[0152] a first obtaining sub-unit configured to obtain the water tank temperature variation rate within a preset time;

[0153] a first determining sub-unit configured to determine that the type of the heat pump water supply system is a primary water system if the water tank temperature variation rate is less than or equal to a preset rate;

[0154] a second determining sub-unit configured to determine that the type of the heat pump water supply system is a secondary water system if the water tank temperature variation rate is greater than the preset rate.

[0155] Optionally, the water pump control device further comprises:

[0156] a third control module configured to, after identifying the type of the heat pump water supply system according to whether water flow switch protection occurs and the water tank temperature variation rate, restore the second water pump to a preset gear to run; periodically obtain a main machine in-out water temperature difference, and if the main machine in-out water temperature difference is greater than or equal to a first threshold value, increase the gear of the first water pump, if the main machine in-out water temperature difference is less than a second threshold value, decrease the gear of the first water pump, and if the main machine in-out water temperature difference is greater than or equal to the second threshold value and less than the first threshold value, keep the current gear of the first water pump unchanged, so as to make the first water pump run stably; wherein the main machine in-out water temperature difference is an absolute value of the difference between the main machine out-water temperature and the main machine in-water temperature.

[0157] Optionally, the second control module 93 comprises:

[0158] a first control unit configured to, when detecting that the terminal load becomes small, determine a target control strategy corresponding to the type of the heat pump water supply system, and control the gear of the first water pump according to the main machine in-out water temperature difference according to the target control strategy;

[0159] a second control unit configured to, when detecting that the terminal load becomes large, control the gear of the first water pump according to the main machine in-out water temperature difference according to a preset control strategy.

[0160] Optionally, the first control unit comprises:

[0161] The first control subunit is configured to periodically acquire the temperature difference between the inlet and outlet water of the main machine if the type of the heat pump water supply system is a primary water system, and increase the gear of the first water pump if the temperature difference between the inlet and outlet water of the main machine is greater than or equal to a first threshold value, or keep the current gear of the first water pump unchanged if the temperature difference between the inlet and outlet water of the main machine is less than the first threshold value.

[0162] The second control subunit is configured to periodically acquire the temperature difference between the inlet and outlet water of the main machine if the type of the heat pump water supply system is a secondary water system, and increase the gear of the first water pump if the temperature difference between the inlet and outlet water of the main machine is greater than or equal to the first threshold value, or decrease the gear of the first water pump if the temperature difference between the inlet and outlet water of the main machine is less than a second threshold value, or keep the current gear of the first water pump unchanged if the temperature difference between the inlet and outlet water of the main machine is greater than or equal to the second threshold value and less than the first threshold value.

[0163] Optionally, the second control subunit is further configured to, after decreasing the gear of the first water pump, determine whether water flow switch protection occurs in the circulating loop in which the first water pump is located, and restore the first water pump to the gear before the decrease and set the gear before the decrease as the lowest allowable gear of the first water pump if the water flow switch protection occurs.

[0164] Optionally, the second control unit comprises:

[0165] The second acquisition subunit is configured to periodically acquire the temperature difference between the inlet and outlet water of the main machine;

[0166] The third control subunit is configured to increase the gear of the first water pump if the temperature difference between the inlet and outlet water of the main machine is greater than or equal to a first threshold value.

[0167] The fourth control subunit is configured to keep the current gear of the first water pump unchanged if the temperature difference between the inlet and outlet water of the main machine is less than the first threshold value.

[0168] The water pump control device described above can execute the water pump control method provided by the embodiments of the present application, and has the corresponding functional modules and beneficial effects of the execution method. Technical details not described in detail in the embodiments can be referred to the water pump control method provided by the embodiments of the present application.

[0169] The device embodiments described above are only schematic, and the units described as separate components can or can not be physically separated, and the components shown as units can or can not be physical units, i.e. they can be located in one place, or distributed on multiple network units. Part or all of the modules can be selected according to actual needs to achieve the purpose of the embodiments.

[0170] Embodiment 4

[0171] The embodiment provides a heat pump water supply system, comprising the water pump control device in the above embodiment.

[0172] Embodiment 5

[0173] The embodiment provides a nonvolatile computer readable storage medium, which stores a computer program, and the computer program is executed by a processor to realize the water pump control method in the above embodiment.

[0174] Embodiment 6

[0175] The embodiment provides an electronic device, comprising a memory, a processor and a computer program stored in the memory and executable on the processor, and the processor realizes the water pump control method in the above embodiment when executing the computer program.

[0176] Figure 10 is a hardware structure schematic diagram of the electronic device provided by the embodiment of the application, as shown in Figure 10 , the electronic device comprises one or more processors 910 and a memory 920, Figure 10 , taking one processor 910 as an example. The electronic device can also comprise an input device 930 and an output device 940.

[0177] The processor 910, the memory 920, the input device 930 and the output device 940 can be connected through a bus or other means, Figure 10 , taking the connection through the bus as an example.

[0178] The memory 920 is a kind of nonvolatile computer readable storage medium, which can be used to store nonvolatile software programs, nonvolatile computer executable programs and modules, such as program instructions / modules corresponding to the water pump control method in the embodiment of the application. The processor 910 executes various function applications and data processing by running the nonvolatile software program, instruction and module stored in the memory 920, that is, realizes the above water pump control method.

[0179] The memory 920 can include a program storage area and a data storage area, wherein the program storage area can store application programs required by the operation device and at least one function; the data storage area can store running data, parameter threshold values and the like. In addition, the memory 920 can include a high-speed random access memory, and can also include a nonvolatile memory, such as at least one magnetic disk storage device, a flash memory device or other nonvolatile solid-state storage device.

[0180] The input device 930 can receive input digital or character information, and generate key signal input related to user settings and function control of the electronic device. The output device 940 can include a display device such as a display screen.

[0181] The one or more modules are stored in the memory 920 and, when executed by the one or more processors 910, perform the water pump control method described above.

[0182] Those skilled in the art can clearly understand the implementation of the embodiments by means of software and necessary general hardware platforms from the above description of the embodiments, and of course, the embodiments can also be implemented by hardware. Based on such understanding, the above technical solutions, essentially or in the sense of contribution to the prior art, can be embodied in the form of a software product. The computer software product can be stored in a computer readable storage medium, such as a ROM / RAM, a magnetic disk, or an optical disc, and includes a plurality of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0183] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for some technical features thereof; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A water pump control method applied to a heat pump water supply system, the heat pump water supply system comprising a main unit, a buffer tank, and at least one terminal, wherein a first water pump is installed on the return water pipe of the main unit, and a second water pump is installed on the main inlet water pipe of the at least one terminal, characterized in that, The water pump control method includes: In response to the identification command, the first water pump is controlled to operate at the highest gear, and the second water pump is turned off; The type of heat pump water supply system is identified by whether the water flow switch protection and the water tank temperature change rate occur. The type is either a primary water system or a secondary water system. In the primary water system, the buffer tank is connected in series with the main unit and the terminal. The heat or cold generated by the main unit circulates in a large loop formed by the main unit and the terminal under the action of the first water pump. The secondary water system includes two water circulation loops: a first water circulation loop formed by the main unit and the buffer tank and a second water circulation loop formed by the buffer tank and the terminal. The first water pump is located in the first water circulation loop. The speed of the first water pump is controlled according to the changes in terminal load, the type of the heat pump water supply system, and the temperature difference between the inlet and outlet water of the main unit. The temperature difference between the inlet and outlet water of the main unit is the absolute value of the difference between the outlet water temperature and the inlet water temperature of the main unit.

2. The method according to claim 1, characterized in that, The type of heat pump water supply system can be identified based on whether the flow switch protection is activated and the rate of temperature change in the water tank, including: Determine if the flow switch protection is activated; If the flow switch protection is activated, it is determined that the type of the heat pump water supply system is a primary water system; If the water flow switch protection does not occur, the type of the heat pump water supply system is identified based on the water tank temperature change rate.

3. The method according to claim 2, characterized in that, Identifying the type of the heat pump water supply system based on the water tank temperature change rate includes: Obtain the rate of temperature change in the water tank within a preset time period; If the temperature change rate of the water tank is less than or equal to the preset rate, the type of the heat pump water supply system is determined to be a primary water system. If the temperature change rate of the water tank is greater than the preset rate, the type of the heat pump water supply system is determined to be a secondary water system.

4. The method according to claim 1, characterized in that, After identifying the type of the heat pump water supply system based on whether the flow switch protection and the water tank temperature change rate occur, the method further includes: Restore the second water pump to the preset speed; The temperature difference between the inlet and outlet water of the host is periodically acquired. If the temperature difference between the inlet and outlet water of the host is greater than or equal to a first threshold, the speed of the first water pump is increased. If the temperature difference between the inlet and outlet water of the host is less than a second threshold, the speed of the first water pump is decreased. If the temperature difference between the inlet and outlet water of the host is greater than or equal to the second threshold and less than the first threshold, the current speed of the first water pump is kept unchanged so that the first water pump can operate stably.

5. The method according to any one of claims 1 to 4, characterized in that, The control of the first water pump's speed based on changes in terminal load, the type of the heat pump water supply system, and the temperature difference between the inlet and outlet water of the main unit includes: When the terminal load decreases, a target control strategy corresponding to the type of the heat pump water supply system is determined, and the speed of the first water pump is controlled according to the target control strategy based on the temperature difference between the inlet and outlet water of the host. When an increase in terminal load is detected, the speed of the first water pump is controlled according to the temperature difference between the inlet and outlet water of the host according to the preset control strategy.

6. The method according to claim 5, characterized in that, According to the target control strategy, the speed of the first water pump is controlled based on the temperature difference between the inlet and outlet water of the host, including: If the heat pump water supply system is a primary water system, the temperature difference between the inlet and outlet water of the main unit is periodically acquired. If the temperature difference between the inlet and outlet water of the main unit is greater than or equal to a first threshold, the speed of the first water pump is increased. If the temperature difference between the inlet and outlet water of the main unit is less than the first threshold, the current speed of the first water pump is kept unchanged. If the heat pump water supply system is a secondary water system, the temperature difference between the inlet and outlet water of the main unit is periodically acquired. If the temperature difference between the inlet and outlet water of the main unit is greater than or equal to the first threshold, the speed of the first water pump is increased; if the temperature difference between the inlet and outlet water of the main unit is less than the second threshold, the speed of the first water pump is decreased; if the temperature difference between the inlet and outlet water of the main unit is greater than or equal to the second threshold and less than the first threshold, the current speed of the first water pump is kept unchanged.

7. The method according to claim 6, characterized in that, After reducing the speed of the first water pump, the following is also included: Determine whether the flow switch protection is activated in the circulation loop where the first water pump is located; If the flow switch protection is activated, the first water pump will be restored to its previous speed setting, and the previous speed setting will be set as the lowest permissible speed setting for the first water pump.

8. The method according to claim 5, characterized in that, According to a preset control strategy, the speed of the first water pump is controlled based on the temperature difference between the inlet and outlet water of the main unit, including: The temperature difference between the inlet and outlet water of the host is periodically acquired; If the temperature difference between the inlet and outlet water of the host is greater than or equal to the first threshold, the speed of the first water pump is increased; If the temperature difference between the inlet and outlet water of the host is less than the first threshold, the current speed of the first water pump remains unchanged.

9. A water pump control device applied to a heat pump water supply system, the heat pump water supply system comprising a main unit, a buffer tank, and at least one terminal, wherein a first water pump is installed on the return water pipe of the main unit, and a second water pump is installed on the main inlet water pipe of the at least one terminal, characterized in that, The water pump control device includes: The first control module is used to respond to the identification command, control the first water pump to operate at the highest gear, and shut down the second water pump; The identification module is used to identify the type of the heat pump water supply system based on whether the water flow switch protection and the water tank temperature change rate occur. The type is either a primary water system or a secondary water system. In the primary water system, the buffer tank is connected in series with the main unit and the terminal. The heat or cold generated by the main unit circulates in a large loop formed by the main unit and the terminal under the action of the first water pump. The secondary water system includes two water circulation loops: a first water circulation loop formed by the main unit and the buffer tank and a second water circulation loop formed by the buffer tank and the terminal. The first water pump is located in the first water circulation loop. The second control module is used to control the speed of the first water pump according to the changes in terminal load, the type of the heat pump water supply system and the temperature difference between the inlet and outlet water of the main unit, wherein the temperature difference between the inlet and outlet water of the main unit is the absolute value of the difference between the outlet water temperature and the inlet water temperature of the main unit.

10. A heat pump water supply system, characterized in that, include: The water pump control device according to claim 9.

11. An electronic device, comprising: A memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that the processor, when executing the computer program, implements the water pump control method according to any one of claims 1 to 8.

12. A non-volatile computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the water pump control method according to any one of claims 1 to 8.

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