Control method and control device of heat pump system and heat pump system

Abstract

The invention provides a control method and device of a heat pump system and the heat pump system. The heat pump system comprises a plate heat exchanger, a water tank and a hot water loop flowing through the plate heat exchanger and the water tank, and the plate heat exchanger heats water in the water tank through the hot water loop. The control method comprises the steps that the upper water temperature and the lower water temperature in the water tank are obtained; and a control logic is generated according to the upper water temperature and / or the lower water temperature, and the working state of the heat pump system is controlled and adjusted according to the control logic. According to the control method and device of the heat pump system and the heat pump system, uniform distribution of water temperature in the water tank is ensured, the problem that the water temperature is not uniform possibly caused by a traditional circulating water path is solved, and therefore more stable hot water supply is provided, the use experience of a user is improved, unnecessary energy consumption is avoided, and the service life of the heat pump system is prolonged. And the overall energy efficiency is improved while the user requirements are ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of heat pumps, and particularly to a control method, a control device and a heat pump system for a heat pump system. Background Art

[0002] In the related art, during the use of a heat storage type heat pump water heater, when the water tank volume is large, the water temperature stratification occurs up and down in the water tank, and the water temperature is uneven. Or the newly replenished water after the water tank is drained cannot be heated in time, which affects both the heat pump heating energy efficiency and the user experience. The existing heat pump mixes the water at different temperatures in the upper and lower layers of the water tank by adding a water pump and a circulating water circuit to achieve the purpose of uniform temperature. However, although the above method can improve the water temperature stratification, it will increase the energy consumption of the system because the circulating pump needs to consume additional electricity.

[0003] In addition, the existing heat pump control system is not intelligent enough to monitor and adjust the water temperature distribution in the water tank in real time. For example, the temperature sensors set in the system are not closely combined with the control system of the heat pump to realize the function of dynamically adjusting the working state of the heat pump according to the water temperature change. This may cause the heat pump to still operate when heating is not required, or fail to start in time when heating is required, thus affecting the energy efficiency and user experience. And the existing heat pump system does not fully consider energy efficiency optimization. Especially when the water tank volume is large, it is unable to effectively manage the heat energy distribution in the water tank, resulting in reduced energy efficiency. Summary of the Invention

[0004] The present invention provides a control method, a control device and a heat pump system for a heat pump system to solve the defects existing in the prior art and achieve the following technical effects: ensuring the uniform distribution of the water temperature in the water tank, avoiding the problem of uneven water temperature that may be caused by the traditional circulating water circuit, thereby providing a more stable hot water supply, improving the user experience, and avoiding unnecessary energy consumption, while ensuring the user's needs and improving the overall energy efficiency.

[0005] According to a control method of a heat pump system according to a first aspect embodiment of the present invention, the heat pump system includes a plate heat exchanger, a water tank, and a hot water circuit that respectively flows through the plate heat exchanger and the water tank, and the plate heat exchanger heats the water in the water tank through the hot water circuit;

[0006] The control method includes:

[0007] Obtain the upper water temperature and the lower water temperature in the water tank;

[0008] Generate a control logic according to the upper water temperature and / or the lower water temperature, and control and adjust the working state of the heat pump system according to the control logic.

[0009] According to an embodiment of the present invention, the step of generating control logic based on the upper water temperature and / or the lower water temperature and controlling and adjusting the operating state of the heat pump system according to the control logic specifically includes:

[0010] Obtain the current state of the heat pump system;

[0011] When the heat pump system is in the standby state, if the upper water temperature and / or the lower water temperature meet the first set condition, control the heat pump system to switch to the operating state;

[0012] When the heat pump system is in the operating state, if the upper water temperature and / or the lower water temperature meet the second set condition, control the heat pump system to switch to the standby state.

[0013] According to an embodiment of the present invention, the step of, when the heat pump system is in the standby state, controlling the heat pump system to switch to the operating state according to the upper water temperature and / or the lower water temperature meeting the first set condition specifically includes:

[0014] When the heat pump system is in the standby state, if the difference between the set outlet water temperature and the upper water temperature is greater than the first preset temperature difference, control the heat pump system to switch to the operating state.

[0015] According to an embodiment of the present invention, the step of, when the heat pump system is in the standby state, controlling the heat pump system to switch to the operating state according to the upper water temperature and / or the lower water temperature meeting the first set condition specifically includes:

[0016] When the heat pump system is in the standby state, if the difference between the set outlet water temperature and the lower water temperature is greater than zero and the difference between the upper water temperature and the lower water temperature is greater than the second preset temperature difference, control the heat pump system to switch to the operating state.

[0017] According to an embodiment of the present invention, the step of, when the heat pump system is in the standby state, controlling the heat pump system to switch to the operating state according to the upper water temperature and / or the lower water temperature meeting the first set condition specifically includes:

[0018] When the heat pump system is in the standby state, if the difference between the set outlet water temperature and the upper water temperature is greater than the first preset temperature difference, the difference between the set outlet water temperature and the lower water temperature is greater than zero, and the difference between the upper water temperature and the lower water temperature is greater than the second preset temperature difference, control the heat pump system to switch to the operating state;

[0019] Wherein, the first preset temperature difference is less than or equal to the second preset temperature difference.

[0020] According to an embodiment of the present invention, the step of controlling the heat pump system to switch to the standby state according to the upper water temperature and / or the lower water temperature satisfying the second set condition when the heat pump system is in the operating state specifically includes:

[0021] When the heat pump system is in the operating state, if the lower water temperature is equal to the set outlet water temperature, then control the heat pump system to switch to the standby state.

[0022] According to an embodiment of the present invention, the step of generating a control logic according to the upper water temperature and / or the lower water temperature and controlling and adjusting the working state of the heat pump system according to the control logic further includes:

[0023] When the heat pump system is in the operating state, control and adjust the operating frequency of the compressor of the heat pump system according to the range of the difference between the upper water temperature and the lower water temperature.

[0024] According to an embodiment of the present invention, the step of controlling and adjusting the operating frequency of the compressor of the heat pump system according to the range of the difference between the upper water temperature and the lower water temperature when the heat pump system is in the operating state specifically includes:

[0025] When the heat pump system is in the operating state;

[0026] If the difference between the upper water temperature and the lower water temperature is within the first temperature difference range, then adjust the operating frequency of the compressor to the first frequency;

[0027] If the difference between the upper water temperature and the lower water temperature is within the second temperature difference range, then adjust the operating frequency of the compressor to the second frequency;

[0028] Wherein, the first temperature difference range is greater than the second temperature difference range, and the first frequency is greater than the second frequency.

[0029] According to an embodiment of the present invention, the step of generating a control logic according to the upper water temperature and / or the lower water temperature and controlling and adjusting the working state of the heat pump system according to the control logic further includes:

[0030] When the heat pump system is in the operating state, control and adjust the rotation speed of the water pump on the hot water return loop according to the range of the difference between the upper water temperature and the lower water temperature.

[0031] According to an embodiment of the present invention, when the heat pump system is in an operating state, the step of controlling and adjusting the power of the water pump on the hot water return circuit according to the range of the difference between the upper water temperature and the lower water temperature specifically includes:

[0032] When the heat pump system is in an operating state;

[0033] If the difference between the upper water temperature and the lower water temperature is within a first temperature difference range, then adjust the rotational speed of the water pump on the hot water return circuit to a first rotational speed;

[0034] If the difference between the upper water temperature and the lower water temperature is within a second temperature difference range, then adjust the rotational speed of the water pump on the hot water return circuit to a second rotational speed;

[0035] Wherein, the first temperature difference range is greater than the second temperature difference range, and the first rotational speed is less than the second rotational speed.

[0036] A control device for a heat pump system according to an embodiment of the second aspect of the present invention, the heat pump system includes a plate heat exchanger, a water tank, and a hot water return circuit that respectively flows through the plate heat exchanger and the water tank, and the plate heat exchanger heats the water in the water tank through the hot water return circuit;

[0037] The control device includes:

[0038] An acquisition module for acquiring the upper water temperature and the lower water temperature in the water tank;

[0039] A control module for generating a control logic according to the upper water temperature and / or the lower water temperature, and controlling and adjusting the working state of the heat pump system according to the control logic.

[0040] A heat pump system according to an embodiment of the third aspect of the present invention includes a memory, a processor, and a computer program stored on the memory and executable on the processor, and when the processor executes the program, it implements the control method of the heat pump system as described in the embodiment of the first aspect of the present invention.

[0041] The present invention provides a control method for a heat pump system. This method avoids unnecessary energy consumption by real-time monitoring the water temperatures at the upper and lower parts of the water tank and dynamically adjusting the start and stop and other working states of the heat pump system according to preset temperature difference thresholds, and improves the overall energy efficiency while ensuring user requirements. It not only reduces the operating cost but also helps to reduce the impact on the environment, meeting the sustainable development goal of energy conservation and emission reduction. On the other hand, the control method of the present invention ensures the uniform distribution of the water temperature in the water tank, avoiding the problem of uneven water temperature that may be caused by the traditional circulating water circuit, thereby providing a more stable hot water supply and improving the user experience.

[0042] In addition, through the intelligent control logic, the present method realizes the precise control of the operation of the heat pump system. The above control logic can automatically adjust the working state of the heat pump according to the actual temperature distribution in the water tank without manual intervention, improving the automation level of the system.

[0043] Furthermore, since the heat pump system only starts when necessary, the control method of the present invention can reduce the running time of the heat pump and other related devices, thereby reducing equipment wear and maintenance costs and extending the service life of the equipment. Moreover, the control method of the present invention can also be adjusted according to different usage scenarios and user requirements. For example, it can optimize the working mode of the heat pump according to the temperature preference set by the user and the actual state of the water tank, improving the flexibility and adaptability of the system. Description of the Drawings

[0044] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0045] Figure 1 is a schematic flow chart of the control method of the heat pump system provided by the present invention;

[0046] Figure 2 is a schematic structural diagram of the control device of the heat pump system provided by the present invention;

[0047] Figure 3 is a schematic structural diagram of the heat pump system provided by the present invention;

[0048] Figure 4 is a schematic structural diagram of the electronic device provided by the present invention.

[0049] Reference Numerals:

[0050] 1, plate heat exchanger; 2, water tank; 3, hot water circuit; 4, water pump; 5, upper water temperature sensor; 6, lower water temperature sensor. Detailed Embodiments

[0051] To make the objectives, technical solutions, and advantages of the present invention clearer, the following will clearly and completely describe the technical solutions in the present invention in conjunction with the drawings in the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art without creative efforts based on the embodiments in the present invention fall within the scope of protection of the present invention.

[0052] The control method, control device, and heat pump system of the heat pump system proposed by the present invention will be described below with reference to the accompanying drawings. Among them, before describing the embodiments of the present invention in detail, the entire application scenario will be described first. The control method, control device, electronic device, and computer-readable storage medium of the heat pump system according to the embodiments of the present invention can be applied not only to the local heat pump system but also to cloud platforms in the Internet field, or cloud platforms in other types of Internet fields, or can also be applied to third-party devices. Among them, third-party devices may include various different types such as mobile phones, tablets, laptops, in-vehicle computers, and other intelligent terminals.

[0053] Below, only the control method applicable to the heat pump system will be used as an example for illustration. It should be understood that the control method of the embodiments of the present invention can also be applied to cloud platforms and third-party devices.

[0054] It should also be noted that the control method of the heat pump system proposed by the present invention is universal, that is, this method is applicable to both refrigeration and heating of the heat pump system in low-temperature environments or high-temperature environments. For the convenience of description, the following will take the heat pump system heating in a low-temperature environment as an example for illustration.

[0055] For ease of understanding, first, the structural basis of the heat pump system on which the control method of the present invention is based will be introduced: As Figure 3 shown, the heat pump system includes an outdoor heat exchanger, a throttling component, a plate heat exchanger 1, a compressor, a four-way valve, and a gas-liquid separator connected by a refrigerant pipeline. Among them, the four interfaces of the four-way valve are respectively connected to the exhaust port of the compressor, the liquid inlet of the gas-liquid separator, the outdoor heat exchanger, and the plate heat exchanger 1. The throttling component is arranged between the outdoor heat exchanger and the plate heat exchanger 1. A liquid storage device for storing refrigerant is also provided on the refrigerant pipeline. And in the plate heat exchanger 1, heat exchange occurs between the refrigerant and water. The water flows through the plate heat exchanger 1 in the hot water circuit 3 to be heated, and finally is heated into hot water and flows through the water tank 2. The hot water in the hot water circuit 3 further heats the water in the water tank 2. A water pump 4 is provided on the hot water circuit 3, and an upper water temperature sensor 5 and a lower water temperature sensor 6 are provided in the water tank 2.

[0056] As Figure 1 shown, according to the control method of the heat pump system of the first aspect embodiment of the present invention, it includes:

[0057] Step S1, obtaining the upper water temperature and the lower water temperature in the water tank 2;

[0058] Step S2, generating a control logic according to the upper water temperature and / or the lower water temperature, and controlling and adjusting the working state of the heat pump system according to the control logic until the water in the water tank 2 reaches the condition of uniform temperature distribution.

[0059] The control method of the heat pump system according to an embodiment of the present invention has the following specific working principle: First, in step S1, the system needs to use a temperature sensor to monitor the water temperature inside the water tank 2, specifically including the temperatures of the upper and lower parts of the water tank 2. Among them, the sensor for detecting the temperature can be a thermocouple, a resistance temperature detector (RTD), or other types of temperature measuring devices, and the present invention does not make special limitations here. Subsequently, in step S2, the system will determine the operating strategy of the heat pump according to the detected temperature data, such as starting the heat pump to heat the area with a lower water temperature, or adjusting the operating mode of the heat pump to optimize the energy efficiency. Among them, the control logic can be set based on a preset temperature difference threshold. For example, if the temperature difference between the upper and lower waters exceeds a certain set value, the heat pump system may start or adjust its working mode.

[0060] During the adjustment process of the working state of the heat pump system, the system will continuously monitor the water temperature in the water tank 2 and adjust the working state of the heat pump according to the control logic until the water temperature in the entire water tank 2 reaches a uniform distribution. At this time, the temperature difference between the upper and lower parts of the water tank 2 is within an acceptable range, and no additional heating or cooling is required.

[0061] Specifically, the specific working process of the heat pump system is as follows:

[0062] Temperature sensors are installed inside the water tank 2 of the heat pump system, located at the upper and lower parts of the water tank 2 respectively. The purpose of the above temperature sensors is to monitor the water temperature in different areas of the water tank 2 in real time. When the heat pump system starts to work, the temperature sensors will continuously measure and record the water temperatures of the upper and lower parts of the water tank 2. The system will calculate the temperature difference between the upper and lower parts of the water tank 2. It can be understood that the above temperature difference is a key parameter for judging whether it is necessary to start the heat pump to adjust the water temperature.

[0063] Furthermore, the system generates control logic according to the preset control strategy and temperature difference threshold. Among them, the control strategy can include: If the temperature difference between the upper and lower parts exceeds the preset start temperature difference threshold (A), the heat pump is started; If the upper water temperature is lower than the set temperature (Tset), and the lower water temperature is higher than the set temperature, and the temperature difference exceeds the start temperature difference threshold (A) plus another preset value (B), the heat pump is started; If the lower water temperature reaches the set temperature (Tset), the heat pump stops working and enters the standby mode.

[0064] According to the generated control logic, the heat pump system will correspondingly adjust its working state, such as starting the heat pump, adjusting the working mode of the heat pump (such as heating rate, running time, etc.), or completely stopping the heat pump from working. The heat pump system heats or cools the water in the water tank 2, so that the water temperatures of the upper and lower parts gradually approach until the preset temperature uniform distribution condition is reached, that is, the water temperature difference in the water tank 2 is less than an acceptable threshold.

[0065] Throughout the process, the system continuously monitors the water temperature in the water tank 2 and adjusts the working state of the heat pump according to the real-time water temperature data. The control method of the present invention ensures that the water temperature in the water tank 2 always remains within the range set by the user through a dynamic and closed-loop control process.

[0066] In the related art, during the use of a heat storage heat pump water heater, when the volume of the water tank 2 is large, temperature stratification and uneven water temperature may occur in the upper and lower parts of the water tank 2. Or the newly replenished water after the water in the water tank 2 is discharged cannot be heated in time, which not only affects the heating energy efficiency of the heat pump but also affects the user experience. The existing heat pump mixes the water at different temperatures in the upper and lower layers of the water tank 2 by adding a water pump 4 and a circulating water path to achieve the purpose of uniform temperature. However, although the above method can improve the water temperature stratification, it will increase the energy consumption of the system because the circulating pump needs to consume additional electricity.

[0067] In addition, the existing heat pump control system is not intelligent enough to monitor and adjust the water temperature distribution in the water tank 2 in real time. For example, the temperature sensors set in the system are not closely combined with the control system of the heat pump to realize the function of dynamically adjusting the working state of the heat pump according to the change of water temperature. This may cause the heat pump to still operate when heating is not required, or fail to start in time when heating is required, thus affecting the energy efficiency and user experience. Moreover, the existing heat pump system does not fully consider energy efficiency optimization. Especially when the volume of the water tank 2 is large, it is unable to effectively manage the heat energy distribution in the water tank 2, resulting in a reduction in energy efficiency.

[0068] Therefore, to solve the technical defects existing in the above-mentioned related art, the present invention provides a control method for a heat pump system. This method monitors the water temperatures at the upper and lower parts of the water tank 2 in real time and dynamically adjusts the working states such as starting and stopping of the heat pump system according to a preset temperature difference threshold, thereby avoiding unnecessary energy consumption and improving the overall energy efficiency while ensuring the user's needs. It not only reduces the operating cost but also helps to reduce the impact on the environment, meeting the sustainable development goal of energy conservation and emission reduction. On the other hand, the control method of the present invention ensures the uniform distribution of the water temperature in the water tank 2, avoiding the problem of uneven water temperature that may be caused by the traditional circulating water path, thereby providing a more stable hot water supply and improving the user experience.

[0069] In addition, this method realizes the precise control of the operation of the heat pump system through intelligent control logic. The above control logic can automatically adjust the working state of the heat pump according to the actual temperature distribution in the water tank 2 without manual intervention, improving the automation level of the system.

[0070] Furthermore, since the heat pump system is only activated when necessary, the control method of the present invention can reduce the operating time of the heat pump and other related equipment, thereby reducing equipment wear and maintenance costs and extending the service life of the equipment. Moreover, the control method of the present invention can also be adjusted according to different usage scenarios and user requirements. For example, it can optimize the operating mode of the heat pump based on the temperature preferences set by the user and the actual state of the water tank 2, improving the flexibility and adaptability of the system.

[0071] According to some embodiments of the present invention, the step of generating a control logic based on the upper water temperature and / or the lower water temperature and controlling and adjusting the operating state of the heat pump system according to the control logic so that the upper water temperature and the lower water temperature meet the water temperature uniformity condition specifically includes:

[0072] Obtain the current state of the heat pump system;

[0073] When the heat pump system is in the standby state, if the upper water temperature and / or the lower water temperature meet the first set condition, control the heat pump system to switch to the operating state;

[0074] When the heat pump system is in the operating state, if the upper water temperature and / or the lower water temperature meet the second set condition, control the heat pump system to switch to the standby state.

[0075] In this embodiment, first obtain the current state of the heat pump system to determine whether the system is currently in the operating state or the standby state. When the system is in the standby state, if the upper water temperature and / or the lower water temperature meet the first set condition, it indicates that the water in the water tank 2 has not reached the condition of uniform temperature distribution at this time. Therefore, it is necessary to control the heat pump system to switch to the operating state. At this time, the heat pump system will start to work to increase or decrease the water temperature to achieve uniform temperature distribution.

[0076] When the system is in the operating state, if the upper water temperature and / or the lower water temperature meet the second set condition, it indicates that the water in the water tank 2 has reached the condition of uniform temperature distribution at this time. Therefore, control the heat pump system to switch to the standby state. At this time, the heat pump will stop working, thus avoiding unnecessary power waste.

[0077] In a specific embodiment of the present invention, the step of, when the heat pump system is in the standby state, controlling the heat pump system to switch to the operating state according to the upper water temperature and / or the lower water temperature meeting the first set condition specifically includes:

[0078] When the heat pump system is in the standby state, if the difference between the set outlet water temperature and the upper water temperature is greater than the first preset temperature difference, control the heat pump system to switch to the operating state.

[0079] In another specific embodiment of the present invention, the step of controlling the heat pump system to switch to the operating state according to the upper water temperature and / or the lower water temperature satisfying the first set condition specifically includes:

[0080] When the heat pump system is in the standby state, if the difference between the set outlet water temperature and the lower water temperature is greater than zero, and the difference between the upper water temperature and the lower water temperature is greater than the second preset temperature difference, then control the heat pump system to switch to the operating state.

[0081] In still another specific embodiment of the present invention, when the heat pump system is in the standby state, the step of controlling the heat pump system to switch to the operating state according to the upper water temperature and / or the lower water temperature satisfying the first set condition specifically includes:

[0082] When the heat pump system is in the standby state, if the difference between the set outlet water temperature and the upper water temperature is greater than the first preset temperature difference, the difference between the set outlet water temperature and the lower water temperature is greater than zero, and the difference between the upper water temperature and the lower water temperature is greater than the second preset temperature difference, then control the heat pump system to switch to the operating state, where the first preset temperature difference is less than or equal to the second preset temperature difference.

[0083] It can be understood that in the above embodiment, the system detects the upper water temperature T1 and the lower water temperature T2 of the water tank 2, and the set outlet water temperature is preset in the system as Tset. Among them, condition one is: Tset - T1 > A (A is the first preset temperature difference); condition two is: Tset - T2 > 0 and T1 - T2 > B (B is the second preset temperature difference). When the system satisfies any one of condition one and condition two, the heat pump system switches to the operating state, that is, the heat pump starts to heat.

[0084] According to some embodiments of the present invention, when the heat pump system is in the operating state, the step of controlling the heat pump system to switch to the standby state according to the upper water temperature and / or the lower water temperature satisfying the second set condition specifically includes:

[0085] When the heat pump system is in the operating state, if the lower water temperature is equal to the set outlet water temperature, then control the heat pump system to switch to the standby state.

[0086] In this embodiment, when the heat pump system is in the operating state, the system will decide whether to switch to the standby state according to whether the lower water temperature of the water tank 2 meets specific conditions. Specifically, the system continuously monitors the water temperature at the lower part of the water tank 2. When it is detected that the lower water temperature is equal to the set outlet water temperature, it means that the water at the lower part of the water tank 2 has reached the temperature requirement set by the user. Therefore, when the above conditions are met, the system will control the heat pump system to switch from the operating state to the standby state. At this time, the heat pump will stop heating, thereby saving energy and avoiding overheating the water in the water tank 2.

[0087] In this way, it is ensured that the heat pump system operates only when necessary, that is, it starts heating only when the water temperature at the lower part of the water tank 2 is lower than the set outlet water temperature. Once the set temperature is reached, the system will automatically switch to the standby state, which can effectively manage energy use, improve energy efficiency, and at the same time ensure that the user obtains the required hot water temperature.

[0088] According to some embodiments of the present invention, the step of generating control logic based on the upper water temperature and / or the lower water temperature and controlling and adjusting the operating state of the heat pump system according to the control logic further includes:

[0089] When the heat pump system is in the operating state, according to the range of the difference between the upper water temperature and the lower water temperature, control and adjust the operating frequency of the compressor of the heat pump system.

[0090] In a specific embodiment of the present invention, the step of controlling and adjusting the operating frequency of the compressor of the heat pump system according to the range of the difference between the upper water temperature and the lower water temperature when the heat pump system is in the operating state specifically includes:

[0091] When the heat pump system is in the operating state;

[0092] If the difference between the upper water temperature and the lower water temperature is within the first temperature difference range, adjust the operating frequency of the compressor to the first frequency;

[0093] If the difference between the upper water temperature and the lower water temperature is within the second temperature difference range, adjust the operating frequency of the compressor to the second frequency.

[0094] Wherein, the first temperature difference range is greater than the second temperature difference range, and the first frequency is greater than the second frequency.

[0095] In this embodiment, if the difference between the upper and lower water temperatures is within the first temperature difference range, the system will adjust the operating frequency of the compressor to the first frequency, which is higher than the second frequency, that is, at this time the compressor will operate at a higher power to reduce the water temperature difference more quickly. If the difference is within the second temperature difference range, the system will adjust the operating frequency of the compressor to the second frequency, which is lower than the first frequency, that is, at this time the compressor will operate at a lower power to maintain or slightly adjust the water temperature.

[0096] By the above method, the system can dynamically adjust the operating frequency of the compressor according to the actual temperature distribution in the water tank 2, which not only ensures the hot water temperature required by the user, but also avoids unnecessary energy consumption, achieving a balance between energy efficiency and temperature control.

[0097] According to some embodiments of the present invention, the step of generating control logic based on the upper water temperature and / or the lower water temperature and controlling the operating state of the heat pump system according to the control logic further includes:

[0098] When the heat pump system is in an operating state, control and adjust the rotational speed of the water pump 4 on the hot water circuit 3 according to the range of the difference between the upper water temperature and the lower water temperature.

[0099] In a specific embodiment of the present invention, when the heat pump system is in an operating state, the step of controlling and adjusting the power of the water pump 4 on the hot water circuit 3 according to the range of the difference between the upper water temperature and the lower water temperature specifically includes:

[0100] When the heat pump system is in an operating state;

[0101] If the difference between the upper water temperature and the lower water temperature is within the first temperature difference range, adjust the rotational speed of the water pump 4 on the hot water circuit 3 to the first rotational speed;

[0102] If the difference between the upper water temperature and the lower water temperature is within the second temperature difference range, adjust the rotational speed of the water pump 4 on the hot water circuit 3 to the second rotational speed.

[0103] Wherein, the first temperature difference range is greater than the second temperature difference range, and the first rotational speed is less than the second rotational speed.

[0104] In this embodiment, if the difference between the upper and lower water temperatures is within the first temperature difference range, the system will adjust the rotational speed of the water pump 4 on the hot water circuit 3 to the first rotational speed, which is lower than the second rotational speed. That is, at this time, the water pump 4 will operate at a lower rotational speed to reduce the water flow rate, thereby reducing energy consumption. If the difference is within the second temperature difference range, the system will adjust the rotational speed of the water pump 4 to the second rotational speed, which is higher than the first rotational speed. That is, at this time, the water pump 4 will operate at a higher rotational speed to increase the water flow rate and mix the water in the water tank 2 faster, reducing temperature stratification.

[0105] In this way, the system can dynamically adjust the rotational speed of the water pump 4 according to the actual temperature distribution in the water tank 2, ensuring both the uniformity of the water temperature in the water tank 2 and the optimization of energy efficiency.

[0106] The control device of the heat pump system provided by the present invention will be described below. The control device of the heat pump system described below can be correspondingly referred to the control method of the heat pump system described above.

[0107] Such as Figure 2As shown, the control device of the heat pump system according to the embodiment of the second aspect of the present invention. The heat pump system includes a plate heat exchanger 1, a water tank 2, and a hot water circuit 3 flowing through the plate heat exchanger 1 and the water tank 2 respectively. The plate heat exchanger 1 heats the water in the water tank 2 through the hot water circuit 3. The control device includes:

[0108] An acquisition module 110, configured to acquire the upper water temperature and the lower water temperature in the water tank 2;

[0109] A control module 120, configured to generate a control logic according to the upper water temperature and / or the lower water temperature, and control and adjust the working state of the heat pump system according to the control logic.

[0110] The heat pump system according to the embodiment of the third aspect of the present invention includes a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the program, it implements the control method of the heat pump system as in the embodiment of the first aspect of the present invention.

[0111] As Figure 3 shown, according to some embodiments of the present invention, the heat pump system further includes an upper water temperature sensor 5 and a lower water temperature sensor 6 in the water tank 2. Among them, the upper water temperature sensor 5 is located in the upper part of the water tank 2 to detect the upper water temperature of the water tank 2, and the lower water temperature sensor 6 is located in the lower part of the water tank 2 to detect the lower water temperature of the water tank 2.

[0112] Figure 4 Illustrates a schematic physical structure diagram of an electronic device. As Figure 4 shown, the electronic device may include: a processor 810, a communication interface 820, a memory 830, and a communication bus 840. Among them, the processor 810, the communication interface 820, and the memory 830 complete mutual communication through the communication bus 840. The processor 810 can call the logical instructions in the memory 830 to execute the control method of the heat pump system. The method includes: acquiring the upper water temperature and the lower water temperature in the water tank 2; generating a control logic according to the upper water temperature and / or the lower water temperature, and controlling and adjusting the working state of the heat pump system according to the control logic.

[0113] In addition, when the logical instructions in the above-mentioned memory 830 are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods of the various embodiments of the present invention. The aforementioned storage medium includes: various media such as USB flash drives, mobile hard disks, read-only memories (ROMs), random access memories (RAMs), magnetic disks, or optical discs that can store program codes.

[0114] On the other hand, the present invention also provides a computer program product. The computer program product includes a computer program that can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer can execute the control method of the heat pump system provided by the above-mentioned various methods. The method includes: obtaining the upper water temperature and the lower water temperature in the water tank 2; generating a control logic based on the upper water temperature and / or the lower water temperature, and controlling and adjusting the working state of the heat pump system according to the control logic.

[0115] In yet another aspect, the present invention also provides a non-transitory computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, it is implemented to execute the control method of the heat pump system provided by the above-mentioned various methods. The method includes: obtaining the upper water temperature and the lower water temperature in the water tank 2; generating a control logic based on the upper water temperature and / or the lower water temperature, and controlling and adjusting the working state of the heat pump system according to the control logic.

[0116] The device embodiments described above are merely illustrative. 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 may be distributed to multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment. A person of ordinary skill in the art can understand and implement it without creative labor.

[0117] Through the description of the above embodiments, those skilled in the art can clearly understand that each embodiment 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 such an understanding, the essence of the above technical solution, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods of each embodiment or some parts of the embodiments.

[0118] 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 them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; 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 each embodiment of the present invention.

Claims

1. A control method for a heat pump system, characterized in that The heat pump system includes a plate heat exchanger, a water tank, and a hot water circuit that flows through the plate heat exchanger and the water tank respectively. The plate heat exchanger heats the water in the water tank through the hot water circuit; The control method includes: Obtain the upper water temperature and the lower water temperature in the water tank; Generate a control logic based on the upper water temperature and / or the lower water temperature, and control and adjust the working state of the heat pump system according to the control logic.

2. The control method of the heat pump system according to claim 1, wherein The step of generating a control logic based on the upper water temperature and / or the lower water temperature, and controlling and adjusting the working state of the heat pump system according to the control logic specifically includes: Obtain the current state of the heat pump system; When the heat pump system is in the standby state, control the heat pump system to switch to the operating state according to the upper water temperature and / or the lower water temperature satisfying a first set condition; When the heat pump system is in the operating state, control the heat pump system to switch to the standby state according to the upper water temperature and / or the lower water temperature satisfying a second set condition.

3. The control method of the heat pump system according to claim 2, wherein, The step of, when the heat pump system is in the standby state, controlling the heat pump system to switch to the operating state according to the upper water temperature and / or the lower water temperature satisfying a first set condition specifically includes: When the heat pump system is in the standby state, if the difference between the set outlet water temperature and the upper water temperature is greater than a first preset temperature difference, control the heat pump system to switch to the operating state.

4. The control method of the heat pump system according to claim 2, wherein, The step of, when the heat pump system is in the standby state, controlling the heat pump system to switch to the operating state according to the upper water temperature and / or the lower water temperature satisfying a first set condition specifically includes: When the heat pump system is in the standby state, if the difference between the set outlet water temperature and the lower water temperature is greater than zero, and the difference between the upper water temperature and the lower water temperature is greater than a second preset temperature difference, control the heat pump system to switch to the operating state.

5. The control method of the heat pump system according to claim 2, characterized in that, The step of, when the heat pump system is in the standby state, controlling the heat pump system to switch to the operating state according to the upper water temperature and / or the lower water temperature satisfying a first set condition specifically includes: When the heat pump system is in the standby state, if the difference between the set outlet water temperature and the upper water temperature is greater than a first preset temperature difference, the difference between the set outlet water temperature and the lower water temperature is greater than zero, and the difference between the upper water temperature and the lower water temperature is greater than a second preset temperature difference, control the heat pump system to switch to the operating state; Wherein, the first preset temperature difference is less than or equal to the second preset temperature difference.

6. The control method of the heat pump system according to any one of claims 2 to 5, characterized in that The step of, when the heat pump system is in the operating state, controlling the heat pump system to switch to the standby state according to the upper water temperature and / or the lower water temperature satisfying a second set condition specifically includes: When the heat pump system is in the operating state, if the lower water temperature is equal to the set outlet water temperature, control the heat pump system to switch to the standby state.

7. The control method of the heat pump system according to claim 2, characterized in that, The step of generating a control logic based on the upper water temperature and / or the lower water temperature and controlling and adjusting the operating state of the heat pump system according to the control logic further includes: When the heat pump system is in an operating state, controlling and adjusting the operating frequency of the compressor of the heat pump system according to the range of the difference between the upper water temperature and the lower water temperature.

8. The control method of the heat pump system according to claim 7, characterized in that, The step of controlling and adjusting the operating frequency of the compressor of the heat pump system according to the range of the difference between the upper water temperature and the lower water temperature when the heat pump system is in an operating state specifically includes: When the heat pump system is in an operating state; If the difference between the upper water temperature and the lower water temperature is within a first temperature difference range, adjusting the operating frequency of the compressor to a first frequency; If the difference between the upper water temperature and the lower water temperature is within a second temperature difference range, adjusting the operating frequency of the compressor to a second frequency; Wherein, the first temperature difference range is greater than the second temperature difference range, and the first frequency is greater than the second frequency.

9. The control method of the heat pump system according to claim 2, characterized in that, The step of generating a control logic based on the upper water temperature and / or the lower water temperature and controlling and adjusting the operating state of the heat pump system according to the control logic further includes: When the heat pump system is in an operating state, controlling and adjusting the rotational speed of the water pump on the hot water return loop according to the range of the difference between the upper water temperature and the lower water temperature.

10. The control method of the heat pump system according to claim 9, characterized in that, The step of controlling and adjusting the power of the water pump on the hot water return loop according to the range of the difference between the upper water temperature and the lower water temperature when the heat pump system is in an operating state specifically includes: When the heat pump system is in an operating state; If the difference between the upper water temperature and the lower water temperature is within a first temperature difference range, adjusting the rotational speed of the water pump on the hot water return loop to a first rotational speed; If the difference between the upper water temperature and the lower water temperature is within a second temperature difference range, adjusting the rotational speed of the water pump on the hot water return loop to a second rotational speed; Wherein, the first temperature difference range is greater than the second temperature difference range, and the first rotational speed is less than the second rotational speed.

11. A control device for a heat pump system, characterized in that, The heat pump system includes a plate heat exchanger, a water tank, and a hot water return loop that flows through the plate heat exchanger and the water tank respectively, and the plate heat exchanger heats the water in the water tank through the hot water return loop; The control device includes: An acquisition module for acquiring the upper water temperature and the lower water temperature in the water tank; A control module for generating a control logic based on the upper water temperature and / or the lower water temperature and controlling and adjusting the operating state of the heat pump system according to the control logic.

12. A heat pump system, comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, characterized in that, When the processor executes the program, it implements the control method of the heat pump system according to any one of claims 1 to 10.

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