Water tank control device and solar heat collection system

Abstract

The utility model discloses a water tank control device and a solar heat collection system.The water tank control device comprises a cabinet body, a mode switching key, a control unit and a communication interface, the water tank control device is applied to the solar heat collection system comprising a plurality of water collection tanks and a water supply tank, and the water collection tanks are each provided with a liquid level sensor and an electromagnetic valve; and the electromagnetic valve is connected with a water supply tank provided with a water pump controller. A mode switching key arranged on the cabinet body is used for switching a manual control mode and an automatic control mode; the control unit is arranged in the cabinet body and electrically connected with the mode switching key, the liquid level sensor and the electromagnetic valve so as to control opening and closing of the electromagnetic valve according to liquid level information sent by the liquid level sensor when the automatic control mode is switched to so as to control starting and stopping of water supplementing from the water supply tank to the water collection tank. The communication interface is arranged in the cabinet body, electrically connected with the control unit and used for being connected with a building control system. The manual control mode ensures that the water tank control device can be normally used when a building control system breaks down and is overhauled. Therefore, the method has control independence.

Description

Technical Field

[0001] The present application relates to the technical field of solar centralized heating, and in particular to a water tank control device and a solar thermal collection system. Background Art

[0002] Solar district heating is a technology that uses solar energy for heating. It absorbs solar radiation through collectors and converts solar energy into thermal energy, which is then transmitted to the water tank that needs to be heated.

[0003] In the related art, there are two ways to control the water tank. The first is to use a control cabinet composed of secondary control components, including intermediate relays, time delay relays and AC contactors; the second is to use a building control system. In the first way, it is necessary to draw a control schematic diagram according to the actual needs of different projects, temporarily install and debug the control cabinet, which is cumbersome and prone to failure; in the second way, when the building control system is in a non-working state such as failure or maintenance, the water tank control device cannot operate normally due to its control. Utility Model Content

[0004] The embodiments of the present application disclose a water tank control device and a solar thermal collection system, which can realize intelligent control of a water tank in the solar thermal collection system and ensure its normal operation under the condition of a building control system failure.

[0005] In order to achieve the above objectives, the present application discloses a water tank control device and a solar thermal collection system, comprising:

[0006] A water tank control device, comprising:

[0007] A cabinet body, wherein a mode switching key is provided on the cabinet body, and the mode switching key is used to switch between a manual control mode and an automatic control mode;

[0008] A control unit, the control unit is arranged in the cabinet and is electrically connected to the mode switch key, the liquid level sensor and the solenoid valve. The control unit is used to control the opening or closing of the solenoid valve according to the liquid level information of the water collecting tank sent by the liquid level sensor when the mode switch key is switched to the automatic control mode, so as to control the start and stop of the water supply tank replenishing the water collecting tank. The control unit is used to disconnect the control of the water tank control device when the mode switch key is switched to the manual control mode;

[0009] A communication interface is arranged in the cabinet and is electrically connected to the control unit, and the communication interface is used to connect to a building control system.

[0010] As an optional embodiment, the cabinet is also provided with a plurality of control buttons electrically connected to the control unit, and the plurality of control buttons are arranged at intervals on the cabinet. The plurality of control buttons include a power switch, an emergency stop button, a water pump control key and a plurality of solenoid valve control keys. The water pump control key is used to control the water pump controller, and the plurality of solenoid valve control keys respectively correspond to the solenoid valves of the plurality of water collecting tanks, and are used to control the corresponding solenoid valves.

[0011] As an optional implementation, the control unit is a PLC control unit, the control unit is integrated with wiring terminals, and the wiring terminals are electrically connected to the liquid level sensor, the solenoid valve and the water pump controller through a peripheral circuit.

[0012] As an optional implementation, the cabinet is also provided with a PLC power button and a PLC reset button, the PLC power button is used to turn on and off the PLC control unit, and the PLC reset button is used to restore the initial settings of the PLC control unit.

[0013] As an optional implementation, the PLC power button, the PLC reset button and the emergency stop button are also provided with a light-emitting portion for correspondingly displaying the operating status of the PLC power button, the PLC reset button and the emergency stop button.

[0014] As an optional embodiment, each of the wiring terminals includes an input end and an output end, each of the input ends is used to transmit input signals through the control button, the liquid level sensor, the solenoid valve and the water pump controller to the control unit respectively, and each of the output ends is used to output output signals corresponding to each of the input signals.

[0015] As an optional embodiment, the cabinet is also provided with an alarm device, which is electrically connected to the control unit. The control unit is also used to control the alarm device to sound an alarm based on signals sent by the liquid level sensor, the solenoid valve and the water pump controller.

[0016] As an optional implementation, the cabinet includes a main cabinet and a cabinet door, the control unit and the communication interface are arranged in the main cabinet, and the mode switching key is arranged on the cabinet door;

[0017] The cabinet door is also provided with a touch screen, which is used to set the control parameters of the control unit and display the operating status of the water tank control device.

[0018] As an optional implementation, the communication interface is a RS485 communication interface or a RS232 communication interface.

[0019] A solar thermal collection system includes multiple water collecting tanks, water supply tanks and a water tank control device as mentioned above. The multiple water collecting tanks are provided with liquid level sensors and solenoid valves. The solenoid valves are used to connect to the water supply tanks. The water supply tanks are provided with a water pump controller. The control unit of the water tank control device is electrically connected to the solenoid valves and the water pump controller.

[0020] Compared with the prior art, the beneficial effects of this application are:

[0021] The present application sets a mode switch key on the cabinet, and the mode switch key can be used to switch between the automatic control mode and the manual control mode. When the water tank control device is in the automatic control mode, the control unit controls the start and stop of the water tank by receiving the signal from the liquid level sensor; when the water tank control device is in the manual control mode, the control unit disconnects the control of the water tank control device, and the water tank control device can be controlled by manual adjustment. Therefore, when the building control system is in a fault or under maintenance, the water tank control device can still be in normal use. At the same time, the communication interface is used to connect the building control system to realize network control. Therefore, the water tank control device disclosed in the present application has control independence.

[0022] In addition, the present application can make the overall structure of the water tank control device more compact by placing the control unit and the communication interface in the cabinet. Such an integrated setting simplifies the steps of installing and debugging the control cabinet, reduces the probability of failure and improves installation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0024] Figure 1 is a schematic diagram of a solar thermal collection system disclosed in an embodiment of the present application;

[0025] Figure 2 yes Figure 1 External layout of the water tank control device in;

[0026] Figure 3 yes Figure 1 Internal layout of the water tank control device in .

[0027] Description of reference numerals:

[0028] 1-cabinet; 1a-main cabinet; 1b-cabinet door;

[0029] 2-control button; 21-mode switch button; 22-power switch button; 22a-power on button; 22b-power off button; 23-emergency stop button; 23a-first light-emitting unit; 24-water pump control button; 25-solenoid valve control button; 25a-first solenoid valve control button; 25b-second solenoid valve control button; 25c-third solenoid valve control button; 26-PLC power button; 26a-second light-emitting unit; 27-PLC reset button; 27a-third light-emitting unit;

[0030] 3-control unit; 31-connection terminal; 31a-input terminal; 31b-output terminal; 32-intermediate relay;

[0031] 4- Communication interface;

[0032] 5- Alarm device;

[0033] 6- Touch screen;

[0034] 7-liquid level sensor; 7a-first liquid level sensor; 7b-second liquid level sensor; 7c-third liquid level sensor; 7d-fourth liquid level sensor;

[0035] 8-solenoid valve; 8a-first solenoid valve; 8b-second solenoid valve; 8c-third solenoid valve;

[0036] 9-water pump controller; 9a-water pump;

[0037] 10-water collecting tank; 101-first water collecting tank; 101a-first liquid level; 101b-second liquid level; 101c-third liquid level; 102-second water collecting tank; 103-third water collecting tank;

[0038] 11- water supply tank; 11a- water supply level;

[0039] 12- peripheral circuit;

[0040] 13-Water tank control device. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0042] In the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0043] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

[0044] In addition, the terms "installed", "set", "provided with", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0045] In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, elements or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise specified, "plurality" means two or more.

[0046] The technical solution of the present application will be further described below in conjunction with specific embodiments and drawings.

[0047] See also Figure 1 The present application discloses a solar thermal collection system, which includes a water tank control device 13, multiple water collection tanks 10 and a water supply tank 11. The multiple water collection tanks 10 are each provided with a liquid level sensor 7 and a solenoid valve 8. The solenoid valve 8 is used to connect the water supply tank 11. The water supply tank 11 is provided with a water pump 9a and a water pump controller 9. ， The water tank control device 13 is connected to the solenoid valve 8 and the water pump controller 9, and is used to control the liquid level of the water collecting tank 10 and the start and stop of the water pump 9a.

[0048] The solar thermal system realizes water replenishment from the water supply tank 11 to the water collection tank 10 through the water tank control device 13. Since solar energy is used as an energy source, it has the advantages of environmental protection and energy saving. The water tank control device 13 controls the start and stop of the solenoid valve 8 and the water pump controller 9, and has high reliability.

[0049] Please also read Figures 1 to 3 In some embodiments, the water tank control device 13 includes: a cabinet 1, a control unit 3 and a communication interface 4. The water tank control device 13 is applied to a solar thermal collection system, wherein a mode switch key 21 is provided on the cabinet 1, and the mode switch key 21 is used to switch between a manual control mode and an automatic control mode; the control unit 3 is arranged in the cabinet 1 and is electrically connected to the mode switch key 21, the liquid level sensor 7 and the solenoid valve 8. The control unit 3 is used to control the opening or closing of the solenoid valve 8 according to the liquid level information of the corresponding water collecting tank 10 sent by the liquid level sensor 7 when the mode switch key 21 is switched to the automatic control mode, so as to control the start and stop of the water supply tank 11 replenishing water to the water collecting tank 10. The communication interface 4 is arranged in the cabinet 1 and is electrically connected to the control unit 3. The communication interface 4 is used to connect to a building control system.

[0050] The water tank control device 13 disclosed in the present application is provided with a mode switching key 21 on the cabinet 1, and the mode switching key 21 can be used to switch between the automatic control mode and the manual control mode. When the water tank control device 13 is in the automatic control mode, the control unit 3 controls the start and stop of the water collection tank 10 and the water supply tank 11 by receiving the signal of the liquid level sensor 7; and when the water tank control device 13 is in the manual control mode, the control unit 3 disconnects the control of the water tank control device 13, and the water tank control device 13 can be controlled by manual adjustment. Thus, when the building control system is in failure or maintenance, the water tank control device 13 can still be in normal use. Therefore, the water tank control device 13 disclosed in the present application has control independence.

[0051] In addition, the present application also makes the overall structure of the water tank control device 13 more compact by arranging the control unit 3 and the communication interface 4 in the cabinet 1. Such an integrated setting simplifies the steps of installing and debugging the control cabinet, reduces the probability of failure and improves installation efficiency.

[0052] It is understandable that, as mentioned above, when the water tank control device 13 is in the manual control mode, the control signal of the control unit 3 is shielded, and the shielding method can be adopted by adding a shielding device, or preferably, disconnecting the electrical connection of the control unit 3.

[0053] Furthermore, the cabinet 1 is also provided with a plurality of control buttons 2 electrically connected to the control unit 3. The plurality of control buttons 2 are arranged at intervals on the cabinet 1. The plurality of control buttons 2 include a power switch 22, an emergency stop button 23, a water pump control button 24 and a plurality of solenoid valve control buttons 25.

[0054] The power switch key 22 includes a power on key 22a and a power off key 22b, which are respectively used to turn on and off the water tank control device 13, an emergency stop key 23 is used to stop the operation of the water tank control device 13 in an emergency when the water tank control device 13 fails or other unexpected events occur, a water pump control key 24 is used to control the water pump controller 9, and multiple solenoid valve control keys 25 correspond to the solenoid valves 8 of multiple water collecting tanks 10, respectively, and are used to control the corresponding solenoid valves 8. The multiple control buttons 2 are arranged on the cabinet 1, so that the control lines are centralized on the one hand, which is convenient for maintenance, and on the other hand, it is convenient for operators to operate and control.

[0055] The control unit 3 is a PLC control unit. The control unit 3 is integrated with a wiring terminal 31 . The wiring terminal 31 is electrically connected to the liquid level sensor 7 , the solenoid valve 8 and the water pump controller 9 through the peripheral circuit 12 .

[0056] The PLC control unit program is solidified, which is simple and convenient to implement and has high reliability. The integrated wiring terminal 31 of the control unit 3 is electrically connected to the liquid level sensor 7, the solenoid valve 8 and the water pump controller 9 through the peripheral circuit 12 to automatically detect the liquid level in the water tank, and automatically start or close the solenoid valve 8 and the water pump 9a when the liquid level reaches a preset threshold, thereby realizing automatic control.

[0057] Furthermore, a PLC power button 26 and a PLC reset button 27 are also provided on the cabinet 1. The PLC power button 26 is used to turn on and off the PLC control unit, and the PLC reset button 27 is used to restore the initial settings of the PLC control unit.

[0058] The PLC power button 26 and the PLC reset button 27 are specifically used for the settings of the PLC control unit. The PLC control unit is not turned on and off by the power switch button 22, but is turned on and off by the PLC power button 26, thereby ensuring the control flexibility of the PLC control unit. The PLC reset button 27 can restore the initial settings when a fault occurs in the PLC control unit, so as to facilitate re-debugging and troubleshooting, thereby improving the adaptability and operating efficiency of the equipment.

[0059] Optionally, the emergency stop key 23, the PLC power key 26 and the PLC reset key 27 are further provided with light-emitting parts, which are used to correspondingly display the operating status of the emergency stop key 23, the PLC power key 26 and the PLC reset key 27. Among them, the emergency stop key 23 is provided with a first light-emitting part 23a, the PLC power key 26 is provided with a second light-emitting part 26a, and the PLC reset key 27 is provided with a third light-emitting part 27a.

[0060] Preferably, the first light-emitting unit 23a can emit red light, indicating that the water tank control device 13 is in a fault or other emergency stop state, the second light-emitting unit 26a can emit green light, indicating that the water tank control device 13 is in automatic control mode and started, and the third light-emitting unit 27a emits yellow light and flashes, indicating that the water tank control device 13 is in automatic control mode but not started. In this way, it is convenient for the operator to know the working status of the water tank control device 13 in time, so as to take corresponding operations, improve operating efficiency and avoid misoperation. Of course, in other examples, the specific colors emitted by each light-emitting unit can also be other, for example, the first light-emitting unit 23a emits purple light, the second light-emitting unit 26a emits blue light, the third light-emitting unit 27a emits orange light, etc. This embodiment does not limit this. As long as it is convenient for the operator to easily know the different working states of the water tank control device 13, it is within the protection scope of this application.

[0061] In some embodiments, each wiring terminal 31 includes an input terminal 31a and an output terminal 31b, each input terminal 31a is used to transmit an input signal through the control button 2, the liquid level sensor 7, the solenoid valve 8 and the water pump controller 9 to the control unit 3, and each output terminal 31b is used to output an output signal corresponding to each input signal.

[0062] The wiring terminal 31 includes an input terminal 31a and an output terminal 31b, which can prevent mutual influence between different circuits. For example, the input signal will not interfere with the output circuit, thereby ensuring the accurate transmission and processing of the signal; at the same time, the input terminal 31a and the output terminal 31b are integrated on the wiring terminal 31, making the wiring and debugging of the water tank control device 13 more convenient. When a fault occurs in the wiring terminal 31, only the corresponding circuit needs to be replaced instead of all of it, thereby improving the fault tolerance of the water tank control device 13.

[0063] Optionally, the cabinet 1 is further provided with an alarm device 5, which is electrically connected to the control unit 3. The control unit 3 is also used to control the alarm device 5 to issue an alarm according to the signals sent by the liquid level sensor 7, the solenoid valve 8 and the water pump controller 9.

[0064] The alarm device 5 is electrically connected to the control unit 3, so that the operating status of the liquid level sensor 7, the solenoid valve 8 and the water pump controller 9 can be fed back in time, thereby improving the safety and reliability of the water tank control device 13, while providing better fault diagnosis capabilities and improving the troubleshooting efficiency when a fault occurs.

[0065] Exemplarily, the alarm device 5 is a buzzer, which is arranged at the top of the cabinet 1 and protrudes from the top of the cabinet 1. The sound of the buzzer is highly recognizable and has a strong reminder capability. At the same time, the buzzer has a low cost and a small size, is easy to install, and is applicable to a wide range of scenarios. It is arranged at the top of the cabinet and is more eye-catching. It is understandable that, as another example, the alarm device can also be a light-emitting diode, which emits light by continuously flashing alternately to indicate an emergency.

[0066] The cabinet 1 includes a main cabinet 1a and a cabinet door 1b, the control unit 3 and the communication interface 4 are arranged in the main cabinet 1a, and the mode switching key is arranged on the cabinet door 1b; the cabinet door 1b is also provided with a touch screen 6, and the touch screen 6 is used to set the control parameters of the control unit 3 and display the operating status of the water tank control device 13.

[0067] Similarly, other control buttons 2 are also set on the cabinet door 1b, so that the operator can directly operate the control buttons 2 and the touch screen 6 as needed without directly contacting the control unit 3, which is more convenient and easy to maintain. The setting of the touch screen 6 makes the operating status of the water tank control device 13 more intuitive, indicating that it is currently in manual control mode, automatic control mode or fault state. For example, during the installation stage of the water tank control device 13, the type of liquid level sensor 7 compatible with the water tank control device 13 can be set through the touch screen 6, such as a switch liquid level meter or an analog liquid level meter; or, the touch screen can also display the opening and closing status of the solenoid valve 8 and the water pump controller 9 when the water tank control device 13 is in operation.

[0068] Optionally, the communication interface 4 is an RS485 communication interface or an RS232 communication interface. The RS485 communication interface and the RS232 communication interface can be connected to the building control system and can also ensure the independence of the water tank control device 13. That is, when the building control system fails or is in a maintenance state, the RS485 communication interface or the RS232 communication interface can shield the control signal from the building control system, so that the water tank control device 13 is in a normal manual control mode. Of course, as another example, the communication interface can also be an RS422 communication interface, which has a longer transmission distance and can connect more devices, but correspondingly, the cost is relatively higher. It can be understood that the specific type of the communication interface 4 can be selected differently according to the specific environment in which the solar thermal collection system is located, and the above-mentioned communication interface 4 type should not be used as a limitation to the present application.

[0069] The specific control mode process of the water tank control device 13 is introduced below, including automatic control mode, manual control mode and alarm mode.

[0070] For the sake of convenience, the following description will be made by taking the water tank control device 13 as an example in which a water supply tank 11 and three water collecting tanks 10 are connected, namely, the first water collecting tank 101, the second water collecting tank 102 and the third water collecting tank 103. Among them, the first water collecting tank 101 includes 3 liquid levels, which are the first liquid level 101a, the second liquid level 101b and the third liquid level 101c from low to high.

[0071] In the automatic control mode, the operator can adjust the mode switch key 21 to the automatic control mode by controlling the mode switch key 21 , and at this time the water tank control device 13 receives the control signal from the building control system.

[0072] Taking the first water collecting tank 101 as an example, the liquid level signal of the first water collecting tank 101 is input to the input end 31a of the wiring terminal 31. When the water level of the first water collecting tank 101 is lower than the first liquid level 101a, the control unit 3 receives the corresponding liquid level signal and controls the first solenoid valve 8a to be energized and turned on; the first solenoid valve 8a feeds back its opening signal to the output end 31b of the wiring terminal 31, and the control unit 3 controls the water pump controller 9 to start, and the feedback signal of the water pump controller 9 is input to the input end 31a of the wiring terminal 31, thereby realizing the liquid level replenishment of the first water collecting tank 101.

[0073] Similarly, when the liquid level in the first water collecting tank 101 is higher than the second liquid level 101b, if the control unit 3 has received an open state signal from the second solenoid valve 8b or the third solenoid valve 8c, the control unit 3 controls the first solenoid valve 8a to close, thereby cutting off the power supply circuit of the first solenoid valve 8a, closing the valve, and inputting a feedback signal into the control unit 3.

[0074] Alternatively, when the first water collecting tank 101 is higher than the second liquid level 101b, if the control unit 3 has received a signal that the solenoid valve 8b or the third solenoid valve 8c is in a closed state, the control unit 3 controls the output water pump controller 9 to stop the pump, and the water pump controller 9 is turned off; the feedback signal of the water pump controller 9 being turned off is input to the control unit 3, and the control unit 3 controls the first solenoid valve 8a to be closed, and its feedback signal is input to the control unit 3.

[0075] It should be noted that water can be supplied from the water supply tank 11 to the first water collecting tank 101 only when the water level of the water supply tank 11 is higher than the water supply liquid level 11a.

[0076] It can be understood that the automatic control modes for the second water collecting tank 102 and the third water collecting tank 103 are similar.

[0077] When debugging or repairing the water tank control device 13, or when the building control system fails, the manual control mode needs to be adopted. The mode switch key 21 should be adjusted to the manual side first, at which time the connection between the building control system and the control unit 3 is disconnected. The operator can manually control the opening and closing of the solenoid valve 8 and the start and stop of the water pump controller 9 according to the liquid level sensor 7 corresponding to the water collecting tank 10. The operating principle is as follows: when replenishing the water collecting tank, the solenoid valve 8 should be opened first, and then the water pump controller 9 should be started; after the water collecting tank 10 is replenished, the water pump controller 9 should be closed first, and then the solenoid valve 8 should be closed.

[0078] The control unit 3 will sound an alarm when receiving the following signal, and the alarm device 5 will be activated. Taking the first water collecting tank 101 as an example, receiving the third liquid level 101c indicates that the liquid level of the first water collecting tank 101 is too high, or the first liquid level sensor 7a fails. It can be understood that the alarm process for the second water collecting tank 102 and the third water collecting tank 103 is similar.

[0079] When the control unit 3 fails to receive the following signals, an alarm will be issued and the alarm device 5 will be activated. For example, when the first solenoid valve 8a is opened or closed, the state feedback signal of the first solenoid valve 8a is not received, indicating that the first solenoid valve 8a is faulty; it can be understood that the alarm process for the second solenoid valve 8b and the third solenoid valve 8c is similar. When the water pump controller 9 is opened or closed, the state feedback signal of the water pump controller 9 is not received, indicating that the water pump controller 9 is faulty.

[0080] The above is a detailed introduction to a water tank control device and a solar thermal collection system disclosed in the embodiments of the present application. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the water tank control device and the solar thermal collection system of the present application and their core ideas; at the same time, for general technical personnel in this field, according to the ideas of the present application, there will be changes in the specific implementation methods and application scopes. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A water tank control device, characterized in that: The water tank control device is applied to a solar thermal collection system, which includes a plurality of water collecting tanks and a water supply tank. The plurality of water collecting tanks are provided with a liquid level sensor and a solenoid valve, the solenoid valve is used to connect the water supply tank, the water supply tank is provided with a water pump controller, and the water tank control device includes: A cabinet body, wherein a mode switching key is provided on the cabinet body, and the mode switching key is used to switch between a manual control mode and an automatic control mode; A control unit, the control unit is arranged in the cabinet and is electrically connected to the mode switch key, the liquid level sensor and the solenoid valve. The control unit is used to control the opening or closing of the solenoid valve according to the liquid level information of the water collecting tank sent by the liquid level sensor when the mode switch key is switched to the automatic control mode, so as to control the start and stop of the water supply tank replenishing the water collecting tank. The control unit is used to disconnect the control of the water tank control device when the mode switch key is switched to the manual control mode; A communication interface is arranged in the cabinet and is electrically connected to the control unit, and is used to connect to a building control system.

2. The water tank control device according to claim 1, characterized in that: The cabinet is also provided with a plurality of control buttons electrically connected to the control unit. The plurality of control buttons are arranged at intervals on the cabinet. The plurality of control buttons include a power switch, an emergency stop button, a water pump control key and a plurality of solenoid valve control keys. The water pump control key is used to control the water pump controller. The plurality of solenoid valve control keys respectively correspond to the solenoid valves of the plurality of water collecting tanks and are used to control the corresponding solenoid valves.

3. The water tank control device according to claim 2, characterized in that: The control unit is a PLC control unit, and the control unit is integrated with wiring terminals, and the wiring terminals are electrically connected to the liquid level sensor, the solenoid valve and the water pump controller through a peripheral circuit.

4. The water tank control device according to claim 3, characterized in that: The cabinet is also provided with a PLC power button and a PLC reset button, wherein the PLC power button is used to turn on and off the PLC control unit, and the PLC reset button is used to restore the initial settings of the PLC control unit.

5. The water tank control device according to claim 4, characterized in that: The PLC power button, the PLC reset button and the emergency stop button are also provided with a light-emitting portion for correspondingly displaying the operating status of the PLC power button, the PLC reset button and the emergency stop button.

6. The water tank control device according to claim 3, characterized in that: Each of the wiring terminals includes an input end and an output end, each of the input ends is used to transmit input signals through the control button, the liquid level sensor, the solenoid valve and the water pump controller to the control unit respectively, and each of the output ends is used to output output signals corresponding to each of the input signals.

7. The water tank control device according to claim 1, characterized in that: The cabinet is also provided with an alarm device, which is electrically connected to the control unit. The control unit is also used to control the alarm device to issue an alarm according to the signals sent by the liquid level sensor, the solenoid valve and the water pump controller.

8. The water tank control device according to any one of claims 1 to 7, characterized in that: The cabinet includes a main cabinet and a cabinet door, the control unit and the communication interface are arranged in the main cabinet, and the mode switching key is arranged on the cabinet door; The cabinet door is also provided with a touch screen, which is used to set the control parameters of the control unit and display the operating status of the water tank control device.

9. The water tank control device according to any one of claims 1 to 7, characterized in that: The communication interface is a RS485 communication interface or a RS232 communication interface.

10. A solar thermal collection system, characterized in that: It includes multiple water collecting tanks, water supply tanks and a water tank control device as described in any one of claims 1 to 9, each of the multiple water collecting tanks is provided with a liquid level sensor and a solenoid valve, the solenoid valve is used to connect to the water supply tank, the water supply tank is provided with a water pump controller, and the control unit of the water tank control device is electrically connected to the solenoid valve and the water pump controller.

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