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

Abstract

The invention 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 main machine, a buffer water tank and at least one tail end, a first water pump is arranged on a water return pipeline of the main machine, a second water pump is arranged on a main water inlet pipeline of the at least one tail end, and the method comprises the steps that in response to an identification instruction, the first water pump is controlled to operate at the highest gear, and the second water pump is closed; identifying the type of the heat pump water supply system according to whether water flow switch protection occurs or not and the temperature change rate of the water tank, wherein the type is a primary water system or a secondary water system; controlling the gear of the first water pump according to the tail end load change, the type of the heat pump water supply system and the host inlet and outlet water temperature difference. The type of the water system can be automatically recognized, a proper control strategy is automatically adopted for the first water pump based on the tail end load change and the type of the water system in the operation process, control is conducted according to the water inlet and outlet temperature difference of the host, control is intelligent and more accurate, and system parameters do not need to be manually configured.

Description

Technical Field

[0001] The present invention relates to the technical field of heat pump water supply systems, and in particular to a water pump control method and device, a heat pump water supply system, an electronic device and a medium. Background Art

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

[0003] like Figure 1 As shown, it is a schematic diagram of a primary water system. The main unit mainly includes: 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 fin heat exchanger), a gas-liquid separator 15 and a first water pump 16. Only the main components of the main unit are shown in the figure, and other components, such as the throttling element between the two heat exchangers, are not shown. Taking heating as an example, the high-temperature and high-pressure refrigerant discharged by the compressor 11 enters the first heat exchanger 13 through the four-way valve 12 for heat exchange to transfer the heat of the refrigerant to water. The refrigerant flowing out of the first heat exchanger 13 enters the second heat exchanger 14 for evaporation after throttling, and then enters the gas-liquid separator 15 through the four-way valve 12. After the refrigerant comes out of the gas-liquid separator 15, it returns to the compressor 11 for recompression to form a heating cycle. The user-side water system includes: a buffer water tank 21, at least one terminal (such as a fan disk 22, a floor heater 23) and a second water pump 24. A water heater 231 can also be set at the floor heater 23. The first water pump 16 is located on the return water pipeline of the main unit and is used to drive water circulation. The second water pump 24 is located on the main water inlet pipeline of at least one of the terminals. The first water pump 16 is provided by the main unit, and the second water pump 24 is self-equipped and installed according to specific project requirements. In the primary water system, the buffer water tank 21 can be installed on the return water pipeline or water supply pipeline of the main unit. The buffer water tank 21 can be used to increase the water capacity of the system. In the primary water system, the hot water or cold water taken by the main unit can be directly supplied to the terminal, and the water returned from the terminal returns to the main unit to realize direct supply of hot water / cold water.

[0004] like Figure 2 As shown, it is a schematic diagram of a secondary water system. In the secondary water system, there are two water circuits: the main unit and the buffer water tank 21 form a water circuit, and the buffer water tank 21 and the terminal form a water circuit.

[0005] At present, for different water system types, the host adopts the same control strategy and parameter threshold for the first water pump 16, which may lead to inaccurate control. For example, for the primary water system, the water flow switch protection is triggered when the first water pump 16 is in gear 1, and for the 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 will not be able to trigger the water flow switch protection in time, which may easily 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, pressure, etc. The water flow, temperature and pressure changes of the above-mentioned primary water system and secondary water system may be very similar. Therefore, with the current sensor accuracy, relying on the parameters detected by the sensor, it is impossible to automatically and accurately distinguish whether the host is currently connected to the primary water system or the secondary water system. Instead, it is necessary to manually configure the system parameters after the heat pump water supply system is installed, which is rather cumbersome.

[0007] With regard to the problem that the control of heat pump water supply systems in the prior art is not intelligent and accurate enough, no effective solution has been proposed yet. Summary of the invention

[0008] The embodiments of the present invention provide a water pump control method, device, heat pump water supply system, electronic equipment and medium, so as 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 enough.

[0009] In order to solve the above technical problems, an embodiment of the present invention provides a water pump control method, which is applied to a heat pump water supply system. The heat pump water supply system includes a main unit, a buffer water tank and at least one terminal. A first water pump is arranged on the return water pipeline of the main unit, and a second water pump is arranged on the total water inlet pipeline of the at least one terminal. The water pump control method includes:

[0010] In response to the identification instruction, controlling the first water pump to operate at the highest gear and shutting down the second water pump;

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

[0012] The gear position 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 water of the host.

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

[0014] Determine whether water flow switch protection occurs;

[0015] If the water flow switch protection occurs, it is determined 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, the type of the heat pump water supply system is identified according to the temperature change rate of the water tank.

[0017] Optionally, identifying the type of the heat pump water supply system according to the water tank temperature change rate includes:

[0018] Get the temperature change rate of the water tank within a preset time;

[0019] If the temperature change rate of the water tank 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 change rate is greater than the preset rate, it is determined that the type of the heat pump water supply system is a secondary water system.

[0021] Optionally, 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 change rate, the method further includes:

[0022] Restoring the second water pump to a preset gear position;

[0023] Periodically obtain the inlet and outlet water temperature difference of the host, if the inlet and outlet water temperature difference of the host is greater than or equal to a first threshold, increase the gear of the first water pump, if the inlet and outlet water temperature difference of the host is less than a second threshold, reduce the gear of the first water pump, if the inlet and outlet water temperature difference of the host 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, so that the first water pump runs stably;

[0024] The host inlet and outlet water temperature difference is the absolute value of the difference between the host outlet water temperature and the host inlet water temperature.

[0025] Optionally, controlling the gear position of the first water pump according to the terminal load change, the type of the heat pump water supply system and the temperature difference between the inlet and outlet water of the host comprises:

[0026] 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 position of the first water pump is controlled according to the temperature difference between the inlet and outlet water of the main engine according to the target control strategy;

[0027] When it is detected that the terminal load becomes larger, the gear position of the first water pump is controlled according to the temperature difference between the inlet and outlet water of the main engine in accordance with a preset control strategy.

[0028] Optionally, controlling the gear position of the first water pump according to the target control strategy based on the temperature difference between the inlet and outlet water of the host machine includes:

[0029] If the type of the heat pump water supply system is a primary water system, periodically obtain the inlet and outlet water temperature difference of the host, if the inlet and outlet water temperature difference of the host is greater than or equal to a first threshold, increase the gear position of the first water pump, if the inlet and outlet water temperature difference of the host is less than the first threshold, keep the current gear position of the first water pump unchanged;

[0030] If the type of the heat pump water supply system is a secondary water system, the temperature difference between the inlet and outlet water of the host is periodically obtained. If the temperature difference between the inlet and outlet water of the host is greater than or equal to the first threshold, the gear of the first water pump is increased; if the temperature difference between the inlet and outlet water of the host is less than the second threshold, the gear of the first water pump is reduced; 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 gear of the first water pump is maintained unchanged.

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

[0032] Determine whether the circulation loop where the first water pump is located has water flow switch protection;

[0033] If the water flow switch protection occurs, the first water pump is restored to the gear position before the reduction, and the gear position before the reduction is set as the lowest allowable gear position of the first water pump.

[0034] Optionally, controlling the gear position of the first water pump according to the temperature difference between the inlet and outlet water of the host according to a preset control strategy includes:

[0035] Periodically obtaining the temperature difference between the inlet and outlet water of the host;

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

[0037] If the temperature difference between the inlet and outlet water of the host is less than the first threshold, the current gear position of the first water pump is kept unchanged.

[0038] The embodiment of the present invention further provides a water pump control device, which is applied to a heat pump water supply system. The heat pump water supply system includes a main unit, a buffer water tank and at least one terminal. A first water pump is arranged on the return water pipeline of the main unit, and a second water pump is arranged on the total water inlet pipeline of the at least one terminal. The water pump control device includes:

[0039] a first control module, configured to control the first water pump to operate at a highest gear and shut down the second water pump in response to an identification instruction;

[0040] an identification module, used to identify the type of the heat pump water supply system according to whether water flow switch protection occurs and the water tank temperature change rate, wherein the type is a primary water system or a secondary water system;

[0041] The second control module is used to control the gear position of the first water pump according to the terminal load change, the type of the heat pump water supply system and the temperature difference between the inlet and outlet water of the host.

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

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

[0044] The embodiment of the present invention further provides a non-volatile computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, the water pump control method described in the embodiment of the present invention is implemented.

[0045] By applying the technical solution of the present invention, the first water pump is controlled to operate at the highest gear and the second water pump is turned off. Under this specific control, the water system type can be automatically and accurately identified according to whether the water flow switch protection and the temperature change rate of the water tank appear, and then during the operation of the system, a suitable gear control strategy is automatically adopted for the first water pump based on the terminal load change and the water system type. Under the specific gear control strategy, specific control is performed according to the temperature difference between the inlet and outlet water of the host, avoiding improper control due to misjudgment. The control is intelligent and more precise, realizing adaptive intelligent and precise control of the heat pump water supply system, improving the stability, energy efficiency and adaptability of the system, and users do not need to manually configure complex system parameters, 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. BRIEF DESCRIPTION OF THE 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 flow chart of a water pump control method provided by an embodiment of the present invention;

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

[0050] Figure 5is a flow chart for identifying water system types provided by an embodiment of the present invention;

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

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

[0053] Figure 8 is a control flow chart of the first water pump when the terminal load increases provided by an embodiment of the present invention;

[0054] Fig. 9 is a structural block diagram of a water pump control device provided by an embodiment of the present invention;

[0055] Fig.10 It is a schematic diagram of the hardware structure of an electronic device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0056] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0057] It should be noted that the terms "first", "second", etc. in the specification, claims and drawings of the present invention are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

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

[0059] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0060] The optional embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0061] Example 1

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

[0063] Figure 3 is a flow chart of a water pump control method provided by an embodiment of the present invention, such as Figure 3 As shown, the method comprises the following steps:

[0064] S301, in response to the identification instruction, controlling the first water pump to operate at the highest gear and turning off the second water pump.

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

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

[0067] Among them, the type of heat pump water supply system refers to the type of water system connected to the system host. The identification instruction is used to indicate the start of identification of the type of water system connected to the host. For example, the water system type needs to be automatically identified when the power is turned on for the first time, or the water system type needs to be re-identified after the water system type changes. The identification instruction can be automatically issued when the conditions are met, or it can be issued by the user by operating a preset button. Exemplarily, when the power is turned on for the first time, the first water pump and the second water pump are respectively opened to their respective initial gears. After the first water pump and the second water pump continue to run for a certain period of time (for example, 10 minutes), the water system enters a stable state. At this time, it is equivalent to having an identification instruction, and the water system type can be identified.

[0068] A water flow switch will be set on the water circulation loop. When an abnormal water flow is detected, the water flow switch will automatically trigger protection. For example, when the water flow rate is lower than the preset value or there is no water, the water flow switch protection will be triggered, and the machine will shut down to avoid damage to the equipment due to insufficient water flow. The water tank temperature change rate refers to the rate of change of the water temperature in the buffer water tank. Under the specific control of the first water pump running at the highest gear and the second water pump turned off, the water flow switch protection status and the speed of water tank temperature change of the primary water system and the secondary water system are different. Therefore, this embodiment can automatically and accurately identify the type of water system based on the different characteristics of the primary water system and the secondary water system under specific control.

[0069] The terminal load change refers to the increase or decrease of the terminal load. For example, the terminal load decreases due to the shutdown of some terminal equipment, the terminal load increases due to the addition of some terminal equipment, and the terminal load increases or decreases due to the adjustment of the target temperature of the terminal equipment. The host inlet and outlet water temperature difference is the absolute value of the difference between the host outlet water temperature and the host inlet water temperature. Specifically, it refers to the absolute value of the difference between the outlet water temperature and the inlet water temperature of the heat exchanger in the host that exchanges heat with the water system. Figure 1 and Figure 2 For example, we can calculate △T=|T 出 -T 进 |, △T represents the temperature difference between the inlet and outlet water of the main engine, T 出 represents the outlet water temperature of the first heat exchanger, T 进 Indicates the inlet water temperature of the first heat exchanger. After identifying the water system type, this embodiment automatically adopts a suitable gear control strategy for the first water pump based on the terminal load change and the water system type during system operation, and performs specific control according to the inlet and outlet water temperature difference of the host under the specific gear control strategy, so that the control is intelligent and more accurate.

[0070] This embodiment controls the first water pump to operate at the highest gear and turns off the second water pump. Under this specific control, the water system type can be automatically and accurately identified according to whether the water flow switch protection and the temperature change rate of the water tank appear, and then during the operation of the system, a suitable gear control strategy is automatically adopted for the first water pump based on the terminal load change and the water system type. Under the specific gear control strategy, specific control is performed according to the temperature difference between the inlet and outlet water of the host, avoiding improper control due to misjudgment. The control is intelligent and more precise, realizing adaptive intelligent and precise control of the heat pump water supply system, improving the stability, energy efficiency and adaptability of the system, and users do not need to manually configure complex system parameters, which simplifies the operation process and improves the user experience. 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 based on whether water flow switch protection occurs and the temperature change rate of the water tank, including: judging whether water flow switch protection occurs; if water flow switch protection occurs, determining that the type of the heat pump water supply system is a primary water system; if water flow switch protection does not occur, identifying the type of the heat pump water supply system based on the temperature change rate of the water tank.

[0072] refer to Figure 2 , the terminal equipment of the secondary water system is connected in parallel with the buffer water tank, and the first water pump only needs to overcome the head between the buffer water tank and the main engine. Under the specific control that the first water pump runs at the highest gear and the second water pump is turned off, the secondary water system will not report the water flow switch protection. Figure 1 , the terminal equipment of the primary water system is connected in series with the buffer water tank, and the required head is relatively large. Under the specific control that the first water pump runs at the highest gear and the second water pump is turned off, the first water pump may not meet the head required by the primary water system, which is easy to cause water flow switch protection. Therefore, under the specific control that the first water pump runs at the highest gear and the second water pump is turned off, if the water flow switch protection occurs, it can be determined that the host is connected to the primary water system.

[0073] In this embodiment, under the specific control that the first water pump runs at the highest gear and the second water pump is turned off, if water flow switch protection occurs, it is directly determined to be a primary water system, and the water system type can be automatically and accurately identified; if water flow switch protection does not occur, the water system type is further identified based on the temperature change rate of the water tank.

[0074] Furthermore, the type of the heat pump water supply system is identified based on the water tank temperature change rate, including: obtaining the water tank temperature change rate within a preset time; if the water tank temperature change rate is less than or equal to the preset rate, determining that the type of the heat pump water supply system is a primary water system; if the water tank temperature change 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 the time length used to calculate the temperature change rate of the water tank. The preset time can be set according to the actual situation. For example, the preset time is set to 60 seconds. The preset rate can be an empirical value or obtained through experimental testing. The preset rates of different systems may be different.

[0076] If the host is heating, the water tank temperature rise rate is obtained; if the host is cooling, the water tank temperature drop rate is obtained. There are many ways to obtain the water tank temperature change rate. For example, collect the water tank temperature once at a preset time interval t, calculate |T2-T1| / t to get the water tank temperature change rate within t time, T2 represents the currently collected water tank temperature, and T1 represents the water tank temperature collected before t time; for example, collect the water tank temperature in real time within the preset time t, calculate the average temperature within the first t / 2 time to get T1', calculate the average temperature within the last t / 2 time to get T2', and calculate |T2'-T1'| / t to get the water tank temperature change rate within t time.

[0077] refer to Figure 1 The buffer water tank of the primary water system is connected in series with the host and the terminal. The heat / coldness generated by the host circulates in the large loop formed by the host and the terminal under the action of the first water pump. Figure 2 For the secondary water system, when the second water pump is turned off and only the first water pump is running, the heat / cold generated by the main unit can be approximately considered to circulate only in the small loop formed by the main unit and the buffer water tank. Considering that the shorter the circulation loop, the less heat / cold is lost during the circulation process, therefore, under the same main unit heating / cooling capacity and terminal load, when the second water pump is turned off and only the first water pump is running, the temperature change rate of the water tank in the primary water system is smaller than that of the water tank in the secondary water system. Reference Figure 4 , which is a schematic diagram of the change of water tank temperature of the primary water system and the secondary water system over time. The horizontal axis represents time, and the vertical axis represents the water tank temperature. The upper line is the secondary water system, and the lower line is the primary water system.

[0078] In this embodiment, under the specific control that the first water pump runs at the highest gear and the second water pump is turned off, and in the absence of water flow switch protection, the water system type can be automatically and accurately identified according to the temperature change rate of the water tank.

[0079] Preferably, before controlling the first water pump to run at the highest gear and shutting down the second water pump, ensure that the first water pump runs continuously for a certain period of time to stabilize the water system, which is more conducive to subsequent identification and improves the reliability of identification.

[0080] The embodiment of the present invention identifies the water system type by performing specific control (ie, controlling the first water pump to operate at the highest gear and shutting down the second water pump). After identifying the water system type, it is necessary to restore the normal operation of the first water pump and the second water pump.

[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 change rate, it also includes:

[0082] Restoring the second water pump to a preset gear position;

[0083] The temperature difference between the inlet and outlet water of the host is periodically obtained. If the temperature difference between the inlet and outlet water of the host is greater than or equal to a first threshold, the gear position 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 gear position of the first water pump is reduced; 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 gear position of the first water pump is maintained unchanged, so as to ensure stable operation of the first water pump.

[0084] Among them, the preset gear can be the highest gear, the initial gear or other feasible gear. In order to make the system resume normal operation as quickly as possible, the preset gear is preferably the highest gear of the second water pump. The period for obtaining the temperature difference between the inlet and outlet water of the host can be set according to actual conditions, for example, set to 60 seconds. The first threshold and the second threshold can be set according to actual conditions, for example, the first threshold is set to 8°C and the second threshold is set to 2.5°C. If the temperature difference between the inlet and outlet water of the host is greater than or equal to the first threshold, it means that the difference between the inlet water temperature of the host and the outlet water temperature of the host is large, 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 temperature difference between the inlet and outlet water of the host is less than the second threshold, it means that the difference between the inlet water temperature of the host and the outlet water temperature of the host is small, and the demand is small, so the gear of the first water pump is reduced to save energy. The amplitude of the first water pump upshift or downshift can be set according to actual conditions, such as upshifting one gear each time or upshifting two gears each time.

[0085] After identifying the water system type, this embodiment restores the first water pump and the second water pump to normal operation from a specific control state to ensure stably operating the first water pump. Thereafter, during system operation, a suitable gear control strategy can be automatically adopted for the first water pump based on the terminal load changes and the water system type.

[0086] The heat formula is Q=cm△t, where Q represents the amount of heat an object needs to absorb (or release) when its temperature rises (or decreases), c represents the specific heat capacity of the object, m represents the mass of the object, and △t represents the temperature change of the object.

[0087] For the water path where the main engine 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 between 5℃ and 8℃, which is conducive to the frequency modulation control of the compressor and achieves energy saving), m needs to be reduced, that is, the first water pump needs to be downshifted. However, downshifting the first water pump is likely to cause water flow switch protection. Therefore, when the terminal load becomes smaller, the primary water system should ensure operation priority, that is, the first water pump is not allowed to downshift, and only the first water pump is allowed to maintain the current gear or increase the gear.

[0088] For the water circuit where the main engine is located in the secondary water system, when Q decreases (indicating that the terminal load becomes smaller), in order to ensure that △t remains unchanged (the temperature difference is guaranteed to be between 5℃ and 8℃, which is conducive to the frequency modulation control of the compressor and achieves energy saving), m needs to be reduced. m is directly related to the gear position of the first water pump. The gear position of the water pump is proportional to the water flow rate. The larger the gear position, the greater the water flow rate. At this time, the possibility of water flow switch protection in the secondary water system is very small, and the first water pump should downshift when the conditions are met.

[0089] Specifically, controlling the gear position of the first water pump according to the terminal load change, the type of the heat pump water supply system and the temperature difference between the inlet and outlet water of the host includes:

[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 position of the first water pump is controlled according to the temperature difference between the inlet and outlet water of the main engine according to the target control strategy;

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

[0092] This implementation method changes the gear control strategy of the first water pump according to the change of the terminal load and the type of water system, adopts an appropriate gear control strategy to control the first water pump according to the actual situation of the system, and accurately adjusts the gear of the first water pump in real time to achieve adaptive automatic control and regulation of the first water pump. In response to the situation where the terminal load becomes smaller, corresponding control strategies are set for the first water pumps of the primary water system and the secondary water system respectively. During the actual operation of the system, when it is detected that the terminal load becomes smaller, the corresponding control strategy is selected according to the identified water system type to control the gear of the first water pump; in response to the situation where the terminal load becomes larger, the first water pump does not downshift, and the first water pumps of the primary water system and the secondary water system adopt the same control strategy.

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

[0094] If the type of the heat pump water supply system is a primary water system, periodically obtain the inlet and outlet water temperature difference of the host, if the inlet and outlet water temperature difference of the host is greater than or equal to a first threshold, increase the gear position of the first water pump, if the inlet and outlet water temperature difference of the host is less than the first threshold, keep the current gear position of the first water pump unchanged;

[0095] If the type of the heat pump water supply system is a secondary water system, the temperature difference between the inlet and outlet water of the host is periodically obtained. If the temperature difference between the inlet and outlet water of the host is greater than or equal to the first threshold, the gear of the first water pump is increased; if the temperature difference between the inlet and outlet water of the host is less than the second threshold, the gear of the first water pump is reduced; 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 gear of the first water pump is maintained unchanged.

[0096] In this embodiment, when the terminal load becomes smaller, the gear position of the first water pump is controlled by executing corresponding gear control strategies according to different water systems, thereby achieving automatic and accurate adjustment of the first water pump.

[0097] Furthermore, for the secondary water system, after lowering the gear position of the first water pump, it also includes: determining whether water flow switch protection occurs in the circulation loop where the first water pump is located; if water flow switch protection occurs, restoring the first water pump to the gear position before the lowering, and setting the gear position before the lowering to the lowest allowable gear position of the first water pump.

[0098] In this embodiment, after the gear position of the first water pump is lowered, if the water flow switch protection is reported, it means that the gear position before the lowering is the lowest gear position where the water flow switch protection will not occur. Therefore, the first water pump is restored to the gear position before the lowering to release the water flow switch protection and ensure the normal operation of the system. At the same time, the gear position before the lowering is set to the lowest allowable gear position of the first water pump.

[0099] When it is detected that the terminal load becomes larger, the gear position of the first water pump is controlled according to the temperature difference between the inlet and outlet water of the main engine in accordance with a preset control strategy, including: periodically obtaining the temperature difference between the inlet and outlet water of the main engine; if the temperature difference between the inlet and outlet water of the main engine is greater than or equal to a first threshold, increasing the gear position of the first water pump; if the temperature difference between the inlet and outlet water of the main engine is less than the first threshold, maintaining the current gear position of the first water pump unchanged.

[0100] In this embodiment, when the terminal load increases, both the primary water system and the secondary water system adopt the same control strategy to control the gear position of the first water pump, thereby achieving automatic and accurate adjustment of the first water pump.

[0101] Example 2

[0102] Based on the above embodiments, this embodiment provides a specific implementation of a water pump control method for a heat pump water supply system. The explanations of terms that are the same or corresponding to the above embodiments will not be repeated in this embodiment.

[0103] The water pump control method is described below in conjunction with a specific embodiment. However, it is worth noting that this specific embodiment is only for better illustrating the present application and does not constitute an improper limitation on the present application. The present application is mainly for controlling the first water pump provided by the host. The second water pump is equipped by the project itself. After identifying the water system type, the second water pump can operate according to the preset gear or adjust the gear according to user needs. The present application does not discuss or limit this.

[0104] like Figure 5 The flowchart for identifying the water system type is shown in FIG. 1 , which includes the following steps:

[0105] S501, the system is powered on, and after the water pump receives the start command, the first water pump runs at its initial gear position, and the second water pump runs at its initial gear position.

[0106] S502, the water pump runs for 10 minutes and the water system is stable.

[0107] S503, the host centralized control board sends a signal to turn off the second water pump and operate the first water pump at the highest gear.

[0108] S504, determine whether water flow switch protection occurs, if so, proceed to S505, if not, proceed to S506.

[0109] S505: The water pump control board is identified as a primary water system.

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

[0111] S507, determine whether R≤a is satisfied, if so, proceed to S508, if not, proceed to S509.

[0112] S508: The water pump control board is identified as a primary water system.

[0113] S509, the water pump control board is identified as a secondary water system.

[0114] S510, the host centralized control board sends a signal to control the second water pump to resume operation at a preset gear.

[0115] S511, water pump initialization is completed.

[0116] like Figure 6 As shown in the figure, it is a control flow chart for the water pump to enter stable operation after initialization is completed, including the following steps:

[0117] S601, water pump initialization is completed, and the first water pump is running at the highest gear.

[0118] S602, periodically obtain the host inlet and outlet water temperature difference △T.

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

[0120] S604, if △T≥8°C, the first water pump increases one gear, for example, the highest is gear 10.

[0121] S605: If 2.5°C ≤ △T < 8°C, the first water pump gear is maintained.

[0122] S606: The first water pump operates stably according to the current gear.

[0123] S607: If a change in the terminal load is detected, execute the corresponding process.

[0124] like Figure 7 As shown, it is a control flow chart of the first water pump when the terminal load is reduced, which includes the following steps:

[0125] S701, detect that the terminal load becomes smaller, if it is a primary water system, enter S702, if it is a secondary water system, enter S705.

[0126] S702, obtaining the host inlet and outlet water temperature difference △T every 60 seconds.

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

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

[0129] S705, obtaining the host inlet and outlet water temperature difference △T every 60 seconds.

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

[0131] S707, determine whether water flow switch protection occurs, if so, go to S708, if not, return to S705.

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

[0133] S709: If 2.5≤△T<8℃, the first water pump gear is maintained.

[0134] S710, if △T≥8℃, adjust the first water pump to a higher level.

[0135] like Figure 8 As shown, it is a control flow chart of the first water pump when the terminal load increases, which includes the following steps:

[0136] S801, it is detected that the end load increases.

[0137] S802, obtaining the host inlet and outlet water temperature difference △T every 60 seconds.

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

[0139] S804, if △T≥8℃, adjust the first water pump to a higher level.

[0140] In this embodiment, the water pump has the function of automatically identifying the type of water system, and can automatically and accurately identify whether the connected user side is a primary water system or a secondary water system, and then adopt appropriate control strategies to adjust the water pump according to the characteristics of the water system, so as to achieve precise 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, it 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-up of the unit and its stable operation, 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. Users do not need to manually configure complex system parameters, and the water pump can automatically identify and adjust, which simplifies the operation process and improves the user experience. Because the system runs more stably, the failure rate is reduced, and the maintenance cost is reduced.

[0141] Example 3

[0142] Based on the same inventive concept, this embodiment provides a water pump control device, which is applied to a heat pump water supply system. The heat pump water supply system includes a main unit, a buffer water tank and at least one terminal. A first water pump is arranged on the return water pipeline of the main unit, and a second water pump is arranged on the total water inlet pipeline of the at least one terminal. The water pump control device can be used to implement the water pump control method described in the above embodiment. The water pump control device can be implemented by software and / or hardware, and the water pump control device can generally be integrated into the controller of the main unit of the heat pump water supply system.

[0143] Fig. 9 : is a structural block diagram of a water pump control device provided by an embodiment of the present invention, such as Fig. 9 As shown, the water pump control device includes:

[0144] A first control module 91 is used to control the first water pump to operate at the highest gear and turn off the second water pump in response to the identification instruction;

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

[0146] The second control module 93 is used to control the gear position of the first water pump according to the terminal load change, the type of the heat pump water supply system and the temperature difference between the inlet and outlet water of the host.

[0147] Optionally, the identification module 92 includes:

[0148] A judgment unit, used to judge whether water flow switch protection occurs;

[0149] a determination unit, for determining that the type of the heat pump water supply system is a primary water system if water flow switch protection occurs;

[0150] The identification unit is used to identify the type of the heat pump water supply system according to the temperature change rate of the water tank if the water flow switch protection does not occur.

[0151] Optionally, the identification unit includes:

[0152] The first acquisition subunit is used to acquire the temperature change rate of the water tank within a preset time;

[0153] A first determination subunit is used to determine that the type of the heat pump water supply system is a primary water system if the temperature change rate of the water tank is less than or equal to a preset rate;

[0154] The second determination subunit is used to determine that the type of the heat pump water supply system is a secondary water system if the temperature change rate of the water tank is greater than the preset rate.

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

[0156] The third control module is used to restore the second water pump to a preset gear after identifying the type of the heat pump water supply system according to whether the water flow switch protection occurs and the temperature change rate of the water tank; periodically obtain the inlet and outlet water temperature difference of the host, if the inlet and outlet water temperature difference of the host is greater than or equal to the first threshold, increase the gear of the first water pump; if the inlet and outlet water temperature difference of the host is less than the second threshold, reduce the gear of the first water pump; if the inlet and outlet water temperature difference of the host 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, so as to make the first water pump run stably; wherein, the inlet and outlet water temperature difference of the host is the absolute value of the difference between the outlet water temperature of the host and the inlet water temperature of the host.

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

[0158] A first control unit is used to determine a target control strategy corresponding to the type of the heat pump water supply system when it is detected that the terminal load becomes smaller, and control the gear position of the first water pump according to the target control strategy based on the inlet and outlet water temperature difference of the host;

[0159] The second control unit is used to control the gear position of the first water pump according to the temperature difference between the inlet and outlet water of the main engine according to a preset control strategy when it is detected that the terminal load becomes larger.

[0160] Optionally, the first control unit includes:

[0161] a first control subunit, for periodically acquiring a temperature difference between the inlet and outlet water of the host if the type of the heat pump water supply system is a primary water system, and increasing a gear position of the first water pump if the temperature difference between the inlet and outlet water of the host is greater than or equal to a first threshold, and maintaining a current gear position of the first water pump unchanged if the temperature difference between the inlet and outlet water of the host is less than the first threshold;

[0162] The second control subunit is used to periodically obtain the inlet and outlet water temperature difference of the main unit if the type of the heat pump water supply system is a secondary water system, and if the inlet and outlet water temperature difference of the main unit is greater than or equal to the first threshold, increase the gear of the first water pump; if the inlet and outlet water temperature difference of the main unit is less than the second threshold, reduce the gear of the first water pump; if the inlet and outlet water temperature difference of the main unit 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.

[0163] Optionally, the second control subunit is also used to: after lowering the gear position of the first water pump, determine whether water flow switch protection occurs in the circulation loop where the first water pump is located; if water flow switch protection occurs, restore the first water pump to the gear position before lowering, and set the gear position before lowering as the lowest allowable gear position of the first water pump.

[0164] Optionally, the second control unit includes:

[0165] A second acquisition subunit is used to periodically acquire the temperature difference between the inlet and outlet water of the host;

[0166] A third control subunit, configured to increase the gear position of the first water pump if the temperature difference between the inlet and outlet water of the host is greater than or equal to a first threshold;

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

[0168] The above-mentioned water pump control device can execute the water pump control method provided by the embodiment of the present invention, and has the functional modules and beneficial effects corresponding to the execution method. For technical details not fully described in this embodiment, please refer to the water pump control method provided by the embodiment of the present invention.

[0169] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0170] Example 4

[0171] This embodiment provides a heat pump water supply system, including: the water pump control device described in the above embodiment.

[0172] Example 5

[0173] This embodiment provides a non-volatile computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, the water pump control method described in the above embodiment is implemented.

[0174] Example 6

[0175] This embodiment provides an electronic device, including: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the water pump control method described in the above embodiment when executing the computer program.

[0176] Fig.10 is a schematic diagram of the hardware structure of an electronic device provided by an embodiment of the present invention, such as Fig.10 As shown, the electronic device includes: one or more processors 910 and a memory 920, Fig.10 A processor 910 is taken as an example. The electronic device may further include: 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 may be connected via a bus or other means. Fig.10 The example of connecting through bus is taken in the following.

[0178] The memory 920 is a non-volatile computer-readable storage medium that can be used to store non-volatile software programs, non-volatile computer executable programs and modules, such as program instructions / modules corresponding to the water pump control method in the embodiment of the present invention. The processor 910 executes various functional applications and data processing by running the non-volatile software programs, instructions and modules stored in the memory 920, that is, implementing the above-mentioned water pump control method.

[0179] The memory 920 may include a program storage area and a data storage area, wherein the program storage area may store an application required for operating the device and at least one function; the data storage area may store operating data, parameter thresholds, etc. In addition, the memory 920 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other non-volatile solid-state storage devices.

[0180] The input device 930 may 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 may 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 , the water pump control method is performed.

[0182] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for 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 embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

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 water tank and at least one terminal, a first water pump is arranged on the return water pipeline of the main unit, and a second water pump is arranged on the total water inlet pipeline of the at least one terminal, characterized in that: The water pump control method comprises: In response to the identification instruction, controlling the first water pump to operate at the highest gear and shutting down the second water pump; Identifying the type of the heat pump water supply system according to whether water flow switch protection occurs and the water tank temperature change rate, wherein the type is a primary water system or a secondary water system; The gear position 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 water of the host.

2. The method according to claim 1, characterized in that The type of the heat pump water supply system is identified based on whether the water flow switch protection occurs and the water tank temperature change rate, including: Determine whether water flow switch protection occurs; If the water flow switch protection occurs, 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 according to the temperature change rate of the water tank.

3. The method according to claim 2, characterized in that Identifying the type of the heat pump water supply system according to the water tank temperature change rate includes: Get the temperature change rate of the water tank within a preset time; If the water tank temperature change 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; If the water tank temperature change rate is greater than the preset rate, it is determined that the type of the heat pump water supply system is 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 according to whether the water flow switch protection occurs and the water tank temperature change rate, the method further includes: Restoring the second water pump to a preset gear position; Periodically obtain the inlet and outlet water temperature difference of the host, if the inlet and outlet water temperature difference of the host is greater than or equal to a first threshold, increase the gear of the first water pump, if the inlet and outlet water temperature difference of the host is less than a second threshold, reduce the gear of the first water pump, if the inlet and outlet water temperature difference of the host 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, so that the first water pump runs stably; The host inlet and outlet water temperature difference is the absolute value of the difference between the host outlet water temperature and the host inlet water temperature.

5. The method according to any one of claims 1 to 4, characterized in that Controlling the gear position of the first water pump according to the terminal load change, the type of the heat pump water supply system and the temperature difference between the inlet and outlet water of the host, including: 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 position of the first water pump is controlled according to the temperature difference between the inlet and outlet water of the main engine according to the target control strategy; When it is detected that the terminal load becomes larger, the gear position of the first water pump is controlled according to the temperature difference between the inlet and outlet water of the main engine in accordance with a preset control strategy.

6. The method according to claim 5, characterized in that Controlling the gear position of the first water pump according to the target control strategy and the temperature difference between the inlet and outlet water of the host machine includes: If the type of the heat pump water supply system is a primary water system, periodically obtain the inlet and outlet water temperature difference of the host, if the inlet and outlet water temperature difference of the host is greater than or equal to a first threshold, increase the gear position of the first water pump, if the inlet and outlet water temperature difference of the host is less than the first threshold, keep the current gear position of the first water pump unchanged; If the type of the heat pump water supply system is a secondary water system, the temperature difference between the inlet and outlet water of the host is periodically obtained. If the temperature difference between the inlet and outlet water of the host is greater than or equal to the first threshold, the gear of the first water pump is increased; if the temperature difference between the inlet and outlet water of the host is less than the second threshold, the gear of the first water pump is reduced; 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 gear of the first water pump is maintained unchanged.

7. The method according to claim 6, characterized in that After lowering the gear position of the first water pump, the method further includes: Determine whether water flow switch protection occurs in the circulation loop where the first water pump is located; If the water flow switch protection occurs, the first water pump is restored to the gear position before the reduction, and the gear position before the reduction is set as the lowest allowable gear position of the first water pump.

8. The method according to claim 5, characterized in that Controlling the gear position of the first water pump according to the temperature difference between the inlet and outlet water of the host according to a preset control strategy includes: Periodically obtaining the temperature difference between the inlet and outlet water of the host; If the temperature difference between the inlet and outlet water of the host is greater than or equal to a first threshold, increasing the gear position of the first water pump; If the temperature difference between the inlet and outlet water of the host is less than the first threshold, the current gear position of the first water pump is kept 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 water tank and at least one terminal, a first water pump is arranged on the return water pipeline of the main unit, and a second water pump is arranged on the total water inlet pipeline of the at least one terminal, characterized in that: The water pump control device comprises: a first control module, configured to control the first water pump to operate at a highest gear and shut down the second water pump in response to an identification instruction; an identification module, used to identify the type of the heat pump water supply system according to whether water flow switch protection occurs and the water tank temperature change rate, wherein the type is a primary water system or a secondary water system; The second control module is used to control the gear position of the first water pump according to the terminal load change, the type of the heat pump water supply system and the temperature difference between the inlet and outlet water of the host.

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

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

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

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