Anti-freezing fire water tank

Abstract

The utility model discloses an anti-freezing fire-fighting water tank, which relates to the technical field of fire-fighting equipment and comprises a water tank shell, the upper end of one side of the water tank shell is connected with a water inlet pipe, and the lower end of the other side of the water tank shell is connected with a water outlet pipe; the heating device and the temperature sensor are arranged in the water tank shell; the control module is connected with the heating device and the temperature sensor, the control module detects the real-time water temperature in the water tank shell through the temperature sensor, when the real-time water temperature is lower than a first set temperature value, the control module controls the heating device to work, and when the real-time water temperature is higher than a second set temperature value, the control module controls the heating device to work. If yes, the control module controls the heating device to stop working, and the anti-freezing effect is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of fire fighting equipment, in particular to an antifreeze fire fighting water tank. Background Art

[0002] In cold regions, the water in the fire water tank is prone to freezing due to low temperatures, affecting the normal use of fire equipment, so antifreeze measures are required. Most traditional fire water tanks are placed in a dedicated fire water tank room, and warming measures are taken in the room to ensure that the water temperature of the fire water tank meets the design requirements. A dedicated fire water tank room and warming measures will increase project costs and occupy a larger roof area. Most fire water tanks placed outdoors do not have effective antifreeze measures. Utility Model Content

[0003] The utility model aims to provide an antifreeze fire water tank, which adds a control module, a heating device and a temperature sensor. When the temperature sensor detects that the real-time water temperature is lower than a first set temperature value, the control module controls the heating device to work, thereby achieving an antifreeze effect.

[0004] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0005] One aspect of an embodiment of the utility model provides an antifreeze fire water tank, which includes: a water tank shell, an upper end of one side of the water tank shell is connected to a water inlet pipe, and a lower end of the other side of the water tank shell is connected to a water outlet pipe; a heating device and a temperature sensor, the heating device and the temperature sensor are arranged in the water tank shell; a control module, the control module is respectively connected to the heating device and the temperature sensor, the control module detects the real-time water temperature in the water tank shell through the temperature sensor, when the real-time water temperature is lower than a first set temperature value, the control module controls the heating device to work, and when the real-time water temperature is higher than a second set temperature value, the control module controls the heating device to stop working.

[0006] In some embodiments, the fire water tank also includes a water tank liner and a heat preservation device, the water tank liner is arranged on the inner side of the water tank outer shell, and the heat preservation device is arranged between the water tank outer shell and the water tank liner and wrapped around the outer wall of the water tank liner.

[0007] In some embodiments, the fire water tank also includes a liquid level sensor, a liquid level sensor signal line and a liquid level sensor power line. The liquid level sensor is arranged at the upper end of the water tank shell, and the detection end of the liquid level sensor is arranged above the stored water in the water tank shell. The liquid level sensor is connected to the control module through the liquid level sensor signal line, and the liquid level sensor is connected to the power supply through the liquid level sensor power line.

[0008] In some embodiments, the fire water tank also includes a photovoltaic panel, which is installed on the top of the water tank shell; the fire water tank also includes a battery storage system, which is used to receive charging power from the photovoltaic panel and supply power to electrical equipment in the fire water tank.

[0009] In some embodiments, the fire water tank further includes a water tank foundation, and the water tank foundation is disposed at the bottom of the water tank shell.

[0010] In some embodiments, the fire water tank further includes a ventilation pipe, which is connected to one end of the top of the water tank shell.

[0011] In some embodiments, the fire water tank also includes an electromechanical box, a temperature sensor signal line and a temperature sensor power line. The temperature sensor is connected to the control module via the temperature sensor signal line, and the temperature sensor is connected to the power supply via the temperature sensor power line. The control module is arranged in the electromechanical box, and the electromechanical box is arranged at the top end of the water tank shell.

[0012] In some embodiments, the fire water tank also includes a first resistor, a second resistor and a first capacitor, the control module is connected to a power supply, one end of the temperature sensor is connected to the positive pole of the power supply, the other end of the temperature sensor is connected to one end of the first resistor, one end of the first capacitor and one end of the second resistor, the other end of the first capacitor and the other end of the second resistor are both grounded, and the other end of the first resistor is connected to the first input end of the control module; the fire water tank also includes a relay, the first output end of the control module is connected to one end of the coil end of the relay, the other end of the coil end of the relay is grounded, one end of the switch end of the relay is connected to one end of the heating device, the other end of the heating device is connected to the positive pole of the power supply, and the other end of the switch end of the relay is grounded.

[0013] In some embodiments, the fire water tank further includes a third resistor and a fourth resistor, the receiving end of the liquid level sensor is connected to the second input end of the control module through the third resistor, and the receiving end of the liquid level sensor is grounded through the fourth resistor; the fire water tank further includes a solenoid valve and a solenoid valve drive circuit, the solenoid valve is installed on the water inlet pipe, the solenoid valve drive circuit includes a fifth resistor, a sixth resistor, a seventh resistor, a second capacitor, an optocoupler and a PMOS tube, the control end input end of the optocoupler is connected to one end of the fifth resistor, one end of the sixth resistor and one end of the second capacitor, the other end of the fifth resistor is connected to the positive pole of the power supply, the other end of the sixth resistor and the other end of the second capacitor are both grounded, the control end output end of the optocoupler is connected to the second output end of the control module, the controlled end input end of the optocoupler is connected to one end of the seventh resistor and the gate of the PMOS tube, the other end of the seventh resistor and the source of the PMOS tube are both connected to the positive pole of the power supply, the controlled end output end of the optocoupler is grounded, the drain of the PMOS tube is connected to the first electrode of the solenoid valve, and the second electrode of the solenoid valve is grounded.

[0014] In some embodiments, the solenoid valve driving circuit further includes a diode, wherein a cathode of the diode is connected to a first electrode of the solenoid valve, and an anode of the diode is connected to a second electrode of the solenoid valve.

[0015] An antifreeze fire water tank according to an embodiment of the utility model has at least the following beneficial effects: the present application adds a control module, a heating device and a temperature sensor. When the temperature sensor detects that the real-time water temperature is lower than the first set temperature value, the control module controls the heating device to work, thereby achieving an antifreeze effect.

[0016] This application is installed with a liquid level sensor, which can detect the water level in the fire water tank in real time. When the control module detects through the liquid level sensor that the liquid level is lower than the set water level, the control module controls the solenoid valve to open, and water enters the fire water tank to replenish the water source as soon as possible, thereby ensuring the safety of the fire protection system.

[0017] The present application applies photovoltaic panels to the antifreeze fire water tank of the present application, which not only solves the problem of water tank antifreeze in cold environments, but also improves the use efficiency and safety of the fire water tank, and makes full use of renewable energy to achieve the goal of low-carbon and environmental protection.

[0018] It is to be understood that the foregoing general description and the following detailed description are exemplary only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the description of 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 paying any creative work.

[0020] Figure 1 This is a schematic diagram of the structure of a fire water tank in some embodiments of the present application;

[0021] Figure 2 This is a schematic cross-sectional view of a fire water tank according to some embodiments of the present application;

[0022] Figure 3 This is a circuit connection schematic diagram of the electrical equipment on the fire water tank of some embodiments of the present application. The reference numerals are as follows: 1. Heating device; 2. Water tank shell; 3. Water tank liner; 4. Water tank base; 5. Water inlet pipe; 6. Water outlet pipe; 7. Ventilation pipe; 8. Photovoltaic panel; 9. Electromechanical box; 10. Temperature sensor; 11. Insulation device; 12. Liquid level sensor; 13. Temperature sensor signal line; 14. Temperature sensor power line; 15. Liquid level sensor signal line; 16. Liquid level sensor power line; 17. Fire water tank. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] In the description of the present invention, it should be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0025] The terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first", "second", and "third" may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "plurality" means two or more.

[0026] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected", "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the examples set forth herein; rather, these example embodiments are provided so that the description of the present disclosure will be more comprehensive and complete and the concepts of the example embodiments will be fully conveyed to those skilled in the art. The accompanying drawings are only schematic illustrations of the present disclosure and are not necessarily drawn to scale. The same reference numerals in the figures represent the same or similar parts, and thus their repeated description will be omitted.

[0028] The technical solution of the embodiment of the present application is briefly described below:

[0029] According to some embodiments, Figures 1 to 3 As shown, the present application provides an antifreeze fire water tank, the fire water tank 17 comprises:

[0030] Water tank housing 2, such as Figure 1 As shown, an upper end of one side of the water tank housing 2 is connected to a water inlet pipe 5, and a lower end of the other side of the water tank housing 2 is connected to a water outlet pipe 6;

[0031] The heating device 1 and the temperature sensor 10, such as Figure 1 to Figure 2 As shown, the heating device 1 and the temperature sensor 10 are arranged in the water tank housing 2;

[0032] Control modules such as Figure 3 As shown, the control module is connected to the heating device 1 and the temperature sensor 10 respectively. The control module detects the real-time water temperature in the water tank housing 2 through the temperature sensor 10. When the real-time water temperature is lower than the first set temperature value, the control module controls the heating device 1 to work, and the heating device 1 heats the water in the water tank housing 2. When the real-time water temperature is higher than the second set temperature value, the control module controls the heating device 1 to stop working.

[0033] The first set temperature value and the second set temperature value can be set according to actual needs. In some embodiments, the first set temperature value is set to 5°. When the ambient temperature drops or the water temperature in the water tank approaches 5°, the control module will increase the working intensity of the heating device 1 and increase the heat output. Conversely, in warm weather or when the water temperature in the water tank is high, the control module controls the working intensity of the heating device 1 to decrease, and the heating device 1 stops working when it rises to the second set temperature value to save energy.

[0034] Furthermore, the heating device 1 can be a heating device such as an electric heating tube, a PTC ceramic heater, an electric heating tape, an electric heating wire, a heating tube or an electric heating tube. The number of the heating devices 1 is reasonably set according to the size of the water tank and the outdoor temperature conditions.

[0035] The present application adds a control module, a heating device 1 and a temperature sensor 10. When the temperature sensor 10 detects that the real-time water temperature is lower than the first set temperature value, the control module controls the heating device 1 to work, thereby achieving an anti-freezing effect.

[0036] The following is combined with the appendix of this manual Figures 1 to 3 , the preferred implementation modes of the present disclosure are further elaborated in detail.

[0037] According to some embodiments, Figure 2 As shown, the fire water tank 17 also includes a water tank liner 3 and a heat preservation device 11. The water tank liner 3 is arranged on the inner side of the water tank outer shell 2. The heat preservation device 11 is arranged between the water tank outer shell 2 and the water tank liner 3 and is wrapped around the outer wall of the water tank liner 3.

[0038] The heat preservation device 11 uses a highly efficient heat preservation material to reduce heat loss and improve heating efficiency. In some embodiments, the heat preservation device 11 uses a polyurethane heat preservation board with high heat preservation performance.

[0039] According to some embodiments, Figure 1 to Figure 2 As shown, the fire water tank 17 also includes a liquid level sensor 12, a liquid level sensor signal line 15 and a liquid level sensor power line 16. The liquid level sensor 12 is arranged at the upper end of the water tank shell 2, and the detection end of the liquid level sensor 12 is arranged above the stored water in the water tank shell 2. The liquid level sensor 12 is connected to the control module through the liquid level sensor signal line 15, and the liquid level sensor 12 is connected to the power supply through the liquid level sensor power line 16.

[0040] Specifically, the liquid level sensor 12 is placed on one side wall of the water tank liner 3, and the distance from the liquid level sensor 12 to the top of the water tank liner 3 is 0.1-0.3 meters. The liquid level sensor 12 can detect the water level in the water tank shell 2 in real time. If the water level is lower than the set water level, water can be added to the water tank shell 2.

[0041] According to some embodiments, Figure 1 to Figure 2 As shown, the fire water tank 17 also includes a photovoltaic panel 8, which is installed on the top of the water tank shell 2. The size of the photovoltaic panel 8 is determined by the size of the water tank and the outdoor temperature conditions. In order to ensure the efficiency and durability of the photovoltaic panel 8, a high-efficiency and weather-resistant material is usually selected.

[0042] The fire water tank 17 also includes a battery storage system, which is used to receive the charging power of the photovoltaic panel 8 and supply power to the electrical equipment in the fire water tank 17. When there is light, the photovoltaic panel 8 supplies power to the battery storage system and the electrical equipment in the fire water tank 17, and when there is no light, the battery storage system supplies power to the electrical equipment in the fire water tank 17. The electrical equipment includes a control module, a heating device 1, a temperature sensor 10, a liquid level sensor 12, etc.

[0043] The present application applies photovoltaic panels 8 to the antifreeze fire water tank of the present application, which not only solves the problem of water tank antifreeze in cold environments, but also improves the use efficiency and safety of the fire water tank 17, and makes full use of renewable energy to achieve the goal of low-carbon and environmental protection.

[0044] According to some embodiments, Figure 1 to Figure 2 As shown, the fire water tank 17 also includes a water tank foundation 4 , which is disposed at the bottom of the water tank shell 2 , and is used to support the fire water tank 17 .

[0045] According to some embodiments, Figure 1 to Figure 2 As shown, the fire water tank 17 also includes a ventilation pipe 7, which is connected to one end of the top of the water tank shell 2.

[0046] According to some embodiments, Figure 1 to Figure 2 As shown, the fire water tank 17 also includes an electromechanical box 9, a temperature sensor signal line 13 and a temperature sensor power line 14. The temperature sensor 10 is connected to the control module via the temperature sensor signal line 13, and the temperature sensor is connected to the power supply via the temperature sensor power line 14. The control module is arranged in the electromechanical box 9, and the electromechanical box 9 is arranged at the top end of the water tank shell 2.

[0047] According to some embodiments, Figure 3 As shown, the fire water tank 17 also includes a first resistor R1, a second resistor R2 and a first capacitor C1, the control module is connected to the power supply, one end of the temperature sensor 10 is connected to the positive electrode of the power supply, the other end of the temperature sensor 10 is connected to one end of the first resistor R1, one end of the first capacitor C1 and one end of the second resistor R2, the other end of the first capacitor C1 and the other end of the second resistor R2 are both grounded, and the other end of the first resistor R1 is connected to the first input end of the control module;

[0048] The fire water tank 17 also includes a relay K. The first output end of the control module is connected to one end of the coil end of the relay K, the other end of the coil end of the relay K is grounded, one end of the switch end of the relay K is connected to one end of the heating device 1, the other end of the heating device 1 is connected to the positive pole of the power supply, and the other end of the switch end of the relay K is grounded.

[0049] Based on the working principle of the above embodiment, when the real-time water temperature is lower than the first set temperature value, the resistance of the temperature sensor 10 increases and the output decreases. The first input end of the control module is grounded through the first resistor R1 and the second resistor R2. When a low-level signal is received, the control module controls the coil end of the relay K to be energized, the switch end is energized, the heating device 1 is energized and works, and the heating device 1 heats the water in the water tank housing 2.

[0050] When the real-time water temperature is higher than the second set temperature value, the resistance of the temperature sensor 10 decreases and the output increases. The first input end of the control module receives the high-level signal output by the temperature sensor 10 through the first resistor R1. The control module controls the coil end of the relay K to lose power, the switch end is disconnected, and the heating device 1 loses power and stops working to save energy.

[0051] The present application achieves the effect of preventing the fire water tank 17 from freezing by adopting the coordinated operation of the control module, the heating device 1 and the temperature sensor 10 .

[0052] According to some embodiments, Figure 3 As shown, the fire water tank 17 also includes a third resistor R3 and a fourth resistor R4, the receiving end of the liquid level sensor 12 is connected to the second input end of the control module through the third resistor R3, and the receiving end of the liquid level sensor 12 is grounded through the fourth resistor R4. The liquid level sensor 12 is an ultrasonic sensor.

[0053] The fire water tank 17 also includes a solenoid valve and a solenoid valve driving circuit. The solenoid valve is installed on the water inlet pipe 5. The solenoid valve driving circuit includes a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, a second capacitor C2, an optocoupler U and a PMOS tube QP. The control end input end of the optocoupler U is connected to one end of the fifth resistor R5, one end of the sixth resistor R6 and one end of the second capacitor C2. The other end of the fifth resistor R5 is connected to the positive electrode of the power supply, and the other end of the sixth resistor R6 and the other end of the second capacitor C2 are both grounded. The control end output end of the optocoupler U is connected to the second output end of the control module, and the controlled end input end of the optocoupler U is connected to one end of the seventh resistor R7 and the gate of the PMOS tube QP. The other end of the seventh resistor R7 and the source of the PMOS tube QP are both connected to the positive electrode of the power supply. The controlled end output end of the optocoupler U is grounded, the drain of the PMOS tube QP is connected to the first electrode of the solenoid valve, and the second electrode of the solenoid valve is grounded.

[0054] Based on the working principle of the above embodiment, when the control module detects through the liquid level sensor 12 that the water level in the fire water tank 17 is lower than the set water level, the control module controls the control end (light-emitting end) of the optocoupler U to be turned on, the controlled end (light-receiving end) of the optocoupler U to be turned on, the gate of the PMOS tube QP receives a low level, the PMOS tube QP is turned on, the solenoid valve works, and water enters the fire water tank 17.

[0055] When the control module detects that the water level in the fire water tank 17 reaches the ideal water level through the liquid level sensor 12, the control module controls the control end (light-emitting end) of the optocoupler U to be cut off, the controlled end (light-receiving end) of the optocoupler U to be cut off, the gate of the PMOS tube QP receives a high level, the PMOS tube QP is cut off, the solenoid valve stops working, and the fire water tank 17 does not enter water.

[0056] Among them, the set water level and the ideal water level can be set according to actual needs.

[0057] According to some embodiments, Figure 3 As shown, the solenoid valve driving circuit further includes a diode D, a cathode of the diode D is connected to a first electrode of the solenoid valve, and an anode of the diode D is connected to a second electrode of the solenoid valve.

[0058] The diode D is used to enable the inductive element in the solenoid valve to continue current through the diode D when the solenoid valve is powered off, so as to increase the service life of the solenoid valve.

[0059] In the description of the above embodiments, specific features, structures, materials or characteristics may be combined in a suitable manner in any one or more embodiments or examples.

[0060] Although the present disclosure has been described with reference to several typical embodiments, it should be understood that the terms used are illustrative and exemplary, rather than restrictive. Since the present disclosure can be implemented in a variety of forms without departing from the spirit or essence of the present application, it should be understood that the above-mentioned embodiments are not limited to any of the foregoing details, but should be widely interpreted within the spirit and scope defined by the appended claims, so all changes and modifications falling within the scope of the claims or their equivalents should be covered by the appended claims.

Claims

1. An antifreeze fire water tank, characterized in that: The fire water tank comprises: A water tank shell, wherein an upper end of one side of the water tank shell is connected to a water inlet pipe, and a lower end of the other side of the water tank shell is connected to a water outlet pipe; A heating device and a temperature sensor, wherein the heating device and the temperature sensor are arranged in the water tank housing; A control module, wherein the control module is respectively connected to the heating device and the temperature sensor, and the control module detects the real-time water temperature in the water tank housing through the temperature sensor. When the real-time water temperature is lower than a first set temperature value, the control module controls the heating device to work; when the real-time water temperature is higher than a second set temperature value, the control module controls the heating device to stop working.

2. The fire water tank according to claim 1, characterized in that: The fire water tank also includes a water tank liner and a heat preservation device. The water tank liner is arranged on the inner side of the water tank shell. The heat preservation device is arranged between the water tank shell and the water tank liner and is wrapped around the outer side wall of the water tank liner.

3. The fire water tank according to claim 1, characterized in that: The fire water tank also includes a liquid level sensor, a liquid level sensor signal line and a liquid level sensor power line. The liquid level sensor is arranged at the upper end of the water tank shell, and the detection end of the liquid level sensor is arranged above the stored water in the water tank shell. The liquid level sensor is connected to the control module through the liquid level sensor signal line, and the liquid level sensor is connected to the power supply through the liquid level sensor power line.

4. The fire water tank according to claim 1, characterized in that: The fire water tank further comprises a photovoltaic panel, which is mounted on the top of the water tank shell; The fire water tank also includes a battery storage system, which is used to receive charging power from the photovoltaic panel and supply power to electrical equipment in the fire water tank.

5. The fire water tank according to claim 1, characterized in that: The fire water tank also includes a water tank foundation, which is arranged at the bottom of the water tank shell.

6. The fire water tank according to claim 1, characterized in that: The fire water tank also includes a ventilation pipe, which is communicated with one end of the top of the water tank shell.

7. The fire water tank according to claim 1, characterized in that: The fire water tank also includes an electromechanical box, a temperature sensor signal line and a temperature sensor power line. The temperature sensor is connected to the control module via the temperature sensor signal line, and the temperature sensor is connected to the power supply via the temperature sensor power line. The control module is arranged in the electromechanical box, and the electromechanical box is arranged at one end of the top of the water tank shell.

8. The fire water tank according to claim 3, characterized in that: The fire water tank also includes a first resistor, a second resistor and a first capacitor, the control module is connected to a power supply, one end of the temperature sensor is connected to the positive electrode of the power supply, the other end of the temperature sensor is connected to one end of the first resistor, one end of the first capacitor and one end of the second resistor, the other end of the first capacitor and the other end of the second resistor are both grounded, and the other end of the first resistor is connected to the first input end of the control module; The fire water tank also includes a relay, the first output end of the control module is connected to one end of the coil end of the relay, the other end of the coil end of the relay is grounded, one end of the switch end of the relay is connected to one end of the heating device, the other end of the heating device is connected to the positive pole of the power supply, and the other end of the switch end of the relay is grounded.

9. The fire water tank according to claim 8, characterized in that: The fire water tank further includes a third resistor and a fourth resistor, the receiving end of the liquid level sensor is connected to the second input end of the control module through the third resistor, and the receiving end of the liquid level sensor is grounded through the fourth resistor; The fire water tank also includes a solenoid valve and a solenoid valve driving circuit. The solenoid valve is installed on the water inlet pipe. The solenoid valve driving circuit includes a fifth resistor, a sixth resistor, a seventh resistor, a second capacitor, an optocoupler and a PMOS tube. The control end input end of the optocoupler is connected to one end of the fifth resistor, one end of the sixth resistor and one end of the second capacitor. The other end of the fifth resistor is connected to the positive electrode of the power supply. The other end of the sixth resistor and the other end of the second capacitor are both grounded. The control end output end of the optocoupler is connected to the second output end of the control module. The controlled end input end of the optocoupler is connected to one end of the seventh resistor and the gate of the PMOS tube. The other end of the seventh resistor and the source of the PMOS tube are both connected to the positive electrode of the power supply. The controlled end output end of the optocoupler is grounded. The drain of the PMOS tube is connected to the first electrode of the solenoid valve, and the second electrode of the solenoid valve is grounded.

10. The fire water tank according to claim 9, characterized in that: The solenoid valve driving circuit further includes a diode, wherein a cathode of the diode is connected to a first electrode of the solenoid valve, and an anode of the diode is connected to a second electrode of the solenoid valve.

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