Watering cart waterway system, control method, and watering cart

Abstract

The present application relates to the technical field of water spraying vehicles, and provides a water spraying vehicle waterway system, a control method and a water spraying vehicle, wherein the water spraying vehicle waterway system comprises a water tank, a water pump, an air pump, an air tank, a pressure control valve, a Venturi tube, a spraying assembly and a control device; the Venturi tube has a converging section, a throat and a diverging section, and the spraying assembly is connected with the diverging section; the water tank is suitable for storing water sources; the water inlet of the water pump is connected with the water tank, and the water outlet of the water pump is connected with the converging section; the air tank is suitable for buffering air; the air inlet of the air pump is communicated with the atmosphere, the air outlet of the air pump and the throat are both connected with the air tank, the pressure control valve is arranged between the throat and the air tank, and the pressure control valve is suitable for controlling the pressure of the air entering the throat; the water pump and the pressure control valve are both electrically connected with the control device, and the control device is suitable for controlling the rotating speed of the water pump and the output pressure of the pressure control valve. In this way, the air-water mixture is provided for the spraying assembly, and the water consumption can be reduced under the premise of the same spraying width.

Description

Technical Field

[0001] This invention relates to the field of sprinkler truck technology, and in particular to a sprinkler truck water system, control method, and sprinkler truck. Background Technology

[0002] A water truck is a specialized vehicle used for cleaning urban roads, irrigating landscaping, and in certain situations, controlling dust or conducting emergency firefighting. Currently, water trucks generally use a single water pump, controlled directly by a water valve, to spray water from various nozzles to wash or suppress dust on the ground. Controlling water pressure and volume ensures the width and effectiveness of the washing operation. Larger washing areas require higher water pressure and volume, resulting in a very large water volume. This not only wastes water resources but also leads to varying degrees of water accumulation on the ground, often leaving vehicles with significant dirt residue. In winter, the accumulated water can even freeze, posing a traffic hazard.

[0003] Therefore, how to solve the problem of large water consumption caused by water trucks in the existing technology in order to ensure the width of the washing operation has become an important technical problem to be solved by those skilled in the art. Summary of the Invention

[0004] This invention provides a water system, control method, and water truck for a sprinkler truck, in order to solve the problem of large water consumption caused by existing sprinkler trucks in order to ensure the width of the washing operation.

[0005] This invention provides a water system for a sprinkler truck, including a water tank, a water pump, an air pump, an air tank, a pressure control valve, a venturi tube, a spraying assembly, and a control device. The venturi tube has a converging section, a throat, and a diffuser section, and the spraying assembly is connected to the diffuser section.

[0006] The water tank is suitable for storing water, the inlet of the water pump is connected to the water tank, and the outlet of the water pump is connected to the contraction section.

[0007] The gas tank is adapted to buffer gas, the air inlet of the air pump is connected to the atmosphere, the air outlet of the air pump and the throat are both connected to the gas tank, and the pressure control valve is disposed between the throat and the gas tank, and the pressure control valve is adapted to control the pressure of the gas entering the throat.

[0008] Both the water pump and the pressure control valve are electrically connected to the control device, which is adapted to control the speed of the water pump and the output pressure of the pressure control valve.

[0009] According to the water system of a sprinkler truck provided by the present invention, it further includes a first check valve and / or a second check valve;

[0010] The first check valve is disposed between the water pump and the contraction section, and the first check valve is adapted to allow water to flow only from the water pump to the contraction section;

[0011] The second one-way valve is disposed between the air pump and the air tank, and the second one-way valve is adapted to allow gas to flow only from the air pump to the air tank.

[0012] According to the water system of a sprinkler truck provided by the present invention, the pressure control valve is a proportional pressure reducing valve.

[0013] According to the present invention, a water system for a sprinkler truck includes a spraying assembly comprising a nozzle, a connecting pipe, and a control valve.

[0014] The nozzle is provided in at least two parts, and each nozzle is provided with a corresponding connecting pipe, which is located between the nozzle and the diffuser section;

[0015] The control valve is installed in the connecting pipeline, and one control valve is installed for each connecting pipeline. The control valve is adapted to control the opening and closing of the connecting pipeline, and the control valve is electrically connected to the control device.

[0016] According to the water system of a sprinkler truck provided by the present invention, a pressure detection element is further included. The pressure detection element is disposed in the contraction section and is adapted to detect the pressure value at the contraction section. The pressure detection element is electrically connected to the control device.

[0017] The present invention also provides a control method for a water system of a sprinkler truck, wherein the water system of the sprinkler truck is the aforementioned water system, and the control method for the water system of the sprinkler truck includes:

[0018] Obtain the target operating mode of the sprinkler truck;

[0019] Based on the target operating mode of the sprinkler truck, determine the target rotation speed and target water flow rate of the water pump;

[0020] Acquire environmental parameters, including ambient temperature and ambient humidity;

[0021] The target gas flow rate is determined based on the ambient humidity and the target water flow rate.

[0022] Obtain the pressure value at the constriction section of the venturi tube;

[0023] The target output pressure of the pressure control valve is determined based on the target gas flow rate, the ambient temperature, and the pressure value at the constriction section of the venturi tube.

[0024] The target input current of the pressure control valve is determined based on the target output pressure.

[0025] According to a control method for a water system of a sprinkler truck provided by the present invention, the step of determining the target rotational speed and target water flow rate of the water pump based on the target operating mode of the sprinkler truck includes:

[0026] Based on the pre-set correspondence between each working mode of the sprinkler truck and the water pump speed, determine the target speed of the water pump corresponding to the target working mode of the sprinkler truck.

[0027] Based on the pre-set correspondence between water flow rate and water pump speed, the target water flow rate corresponding to the target speed of the water pump is determined.

[0028] According to a control method for a sprinkler truck water system provided by the present invention, the step of determining the target gas flow rate based on the ambient humidity and the target water flow rate includes:

[0029] Based on the pre-set correspondence between ambient humidity and gas mixing ratio, determine the gas mixing ratio corresponding to the ambient humidity;

[0030] Based on the calculation model of the gas mixing ratio and the target water flow rate, the target gas flow rate corresponding to the target water flow rate is determined.

[0031] According to a control method for a sprinkler truck water system provided by the present invention, determining the target input current of the pressure control valve based on the target output pressure includes:

[0032] Based on the pre-set correspondence between the output pressure and input current of the pressure control valve, the target input current corresponding to the target output pressure is determined.

[0033] The present invention also provides a sprinkler truck, including the sprinkler truck water system described above, or including a control device, the control device being capable of executing the control method of the sprinkler truck water system described above.

[0034] The water system for a sprinkler truck provided by this invention includes a water tank, a water pump, an air pump, an air tank, a pressure control valve, a venturi tube, a spraying assembly, and a control device. The venturi tube has a converging section, a throat, and a diffuser section, and the spraying assembly is connected to the diffuser section. The water tank stores water, the water pump inlet is connected to the water tank, and the water pump outlet is connected to the converging section. When the water pump is running, it can supply water to the converging section of the venturi tube. The air tank buffers gas, the air pump inlet is open to the atmosphere, and the air pump outlet and throat are both connected to the air tank. When the air pump is running, it can deliver gas into the air tank, allowing the tank to store gas at a certain pressure. The pressure control valve is located between the throat and the air tank. The pressure control valve controls the pressure of the gas entering the throat. The gas in the air tank can flow through the pressure control valve to the throat of the venturi tube to mix with the water in the converging section and flow together into the diffuser section of the venturi tube, and then be sprayed out through the spraying assembly. Both the water pump and the pressure control valve are electrically connected to the control device, which can control the pump's speed and the valve's output pressure. This configuration ensures a water-air mixture is supplied to the spraying system, reducing water consumption while maintaining the same spray width, thus saving water and solving the problem of excessive water consumption in existing water trucks designed to ensure a wide washing operation. Furthermore, by controlling the pump's speed and the valve's output pressure, different spray widths can be achieved to meet various spraying needs. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0036] Figure 1 This is a structural schematic diagram of the water system for the sprinkler truck provided by the present invention.

[0037] Figure 2 This is a flowchart of the control method for the water system of the sprinkler truck provided by the present invention.

[0038] Figure label:

[0039] 1. Water tank; 2. Water pump; 3. Air pump; 4. Air tank; 5. Pressure control valve; 6. Venturi tube; 7. First check valve; 8. Second check valve; 9. Nozzle; 10. Connecting pipeline; 11. Control valve; 12. First motor; 13. Second motor. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0041] The following is combined with Figure 1 The water system of the sprinkler truck of the present invention is described.

[0042] like Figure 1 As shown, the water system of the sprinkler truck provided in this embodiment of the invention includes a water tank 1, a water pump 2, an air pump 3, an air tank 4, a pressure control valve 5, a venturi tube 6, a spraying assembly, and a control device.

[0043] Specifically, the Venturi tube 6 has a constriction section, a throat, and a diffuser section, with the spray assembly connected to the diffuser section.

[0044] Water tank 1 is used to store water. The inlet of water pump 2 is connected to water tank 1, and the outlet of water pump 2 is connected to the contraction section. When water pump 2 is running, it can supply water to the contraction section of venturi tube 6.

[0045] Gas tank 4 is used to buffer gas. The air inlet of air pump 3 is connected to the atmosphere. The air outlet and throat of air pump 3 are connected to gas tank 4. When air pump 3 is running, it can deliver gas into gas tank 4, so that gas tank 4 stores gas at a certain pressure.

[0046] The pressure control valve 5 is located between the throat and the gas tank 4. The pressure control valve 5 is used to control the pressure of the gas entering the throat. The gas in the gas tank 4 can flow to the throat of the venturi tube 6 through the pressure control valve 5 to mix with the water in the constriction section of the venturi tube 6 and flow together into the diffusion section of the venturi tube 6, and then be sprayed out through the spraying assembly.

[0047] Both the water pump 2 and the pressure control valve 5 are electrically connected to the control device, which can control the speed of the water pump 2 and the output pressure of the pressure control valve 5.

[0048] This configuration enables the supply of an air-water mixture to the spraying components, reducing water consumption while maintaining the same spray width, thus achieving water conservation and solving the problem of excessive water consumption in existing water trucks to ensure the width of the washing operation.

[0049] In addition, by controlling the speed of the water pump 2 and the output pressure of the pressure control valve 5, different spray widths can be achieved to meet different spraying needs.

[0050] It should be noted that the water pump 2 is driven by the first motor 12, and the air pump 3 is driven by the second motor 13.

[0051] The cross-sectional area of ​​the inlet section of the constriction section of the Venturi tube 6 is larger than that of the throat section. When water flows from the constriction section of the Venturi tube 6 to the throat section, the pressure will decrease from p1 to p2. The output pressure p of the pressure control valve 5 is controlled between p1 and p2, which ensures that gas can be mixed into the water flow and flow out from the diffuser section along the water flow direction of the Venturi tube 6.

[0052] In this embodiment of the invention, the water system of the sprinkler truck further includes a first check valve 7 and / or a second check valve 8.

[0053] The first one-way valve 7 is located between the water pump 2 and the contraction section. The first one-way valve 7 only allows water to flow from the water pump 2 to the contraction section, which can prevent water in the contraction section from flowing back to the water pump 2, thus ensuring the safe operation of the water pump 2.

[0054] The second one-way valve 8 is located between the air pump 3 and the air tank 4. The second one-way valve 8 only allows gas to flow from the air pump 3 to the air tank 4, which can prevent water in the air tank 4 from flowing back to the air pump 3, thus ensuring the safe operation of the air pump 3.

[0055] In this embodiment of the invention, a proportional pressure reducing valve is selected as the pressure control valve 5. By controlling the input current signal of the proportional pressure reducing valve, its output pressure can be precisely controlled, providing accurate control, fast dynamic response, programmability, and flexibility, which is beneficial to improving the stability and reliability of the sprinkler truck's water system.

[0056] In this embodiment of the invention, the spraying assembly includes a nozzle 9, a connecting pipe 10, and a control valve 11.

[0057] The nozzle 9 is provided with at least two nozzles, which can be set in different positions to meet the different working modes of the water sprinkler truck, such as flushing, front flushing, rear dust suppression, and water gun spraying.

[0058] Each nozzle 9 is provided with a corresponding connecting pipe 10, which is located between the nozzle 9 and the diffuser section to connect each nozzle 9 to the diffuser section of the Venturi tube 6, so as to ensure that the gas-water mixture in the diffuser section of the Venturi tube 6 can flow to any nozzle 9.

[0059] Control valves 11 are installed on connecting pipes 10, with one control valve 11 corresponding to each connecting pipe 10. The control valves 11 are used to control the opening and closing of the connecting pipes 10. Depending on the working mode of the sprinkler truck, the state of each control valve 11 can be controlled, and the appropriate nozzles 9 can be selected for spraying operations as needed.

[0060] The control valve 11 is electrically connected to the control device to realize the automatic control of the control valve 11, thereby realizing the automatic control of the water system of the sprinkler truck.

[0061] In this embodiment of the invention, the water system of the sprinkler truck also includes a pressure detection element, which is electrically connected to the control device.

[0062] The pressure sensing element is located in the constriction section of the venturi tube 6, and is used to detect the pressure value at the constriction section of the venturi tube 6.

[0063] Based on the structural parameters of the venturi tube 6 and the pressure value at the constriction section of the venturi tube 6, the pressure value at the throat of the venturi tube 6 can be determined. Then, the target output pressure of the pressure control valve 5 can be determined through calculation, so as to control the pressure control valve 5.

[0064] The pressure sensing element mentioned above can be, but is not limited to, a pressure sensor.

[0065] In summary, the water system of the sprinkler truck provided in this embodiment of the invention uses a venturi tube 6 to mix water and gas, which can easily achieve uniform water mist spraying from the nozzle 9, resulting in a good road washing effect. The combination of water pump 2 and air pump 3 ensures that while saving water through water-air mixing, the output pressure of the nozzle 9 is sufficiently high, resulting in a cleaner road wash.

[0066] On the other hand, the present invention also provides a control method for a sprinkler truck water system based on any of the above embodiments. The control method for the sprinkler truck water system described below can be referred to in correspondence with the sprinkler truck water system described above.

[0067] like Figure 2 As shown, the control method for the water system of the sprinkler truck provided in this embodiment of the invention includes steps 110 to 170.

[0068] Step 110: Obtain the target operating mode of the sprinkler truck.

[0069] The working modes of a water sprinkler truck include flushing, front flushing, rear dust suppression, and water gun spraying. The required spray width varies depending on the working mode. For example, the spray width for flushing needs to be greater than or equal to 24 meters, the spray width for front flushing needs to be greater than or equal to 8 meters, the spray width for rear dust suppression needs to be greater than or equal to 14 meters, and the spray distance for water gun spraying needs to be greater than or equal to 38 meters.

[0070] Therefore, the control process of the water system of the sprinkler truck needs to be carried out according to the target working mode of the sprinkler truck.

[0071] Step 120: Determine the target speed and target water flow rate of the water pump according to the target working mode of the sprinkler truck.

[0072] Different water trucks operate in different modes, requiring different spray widths or spray distances, and consequently, different water flow rates.

[0073] In this embodiment, the rotational speed and water flow rate of the water pump 2 are set for different operating modes. The target rotational speed and target water flow rate of the water pump 2 differ depending on the target operating mode of the sprinkler truck.

[0074] In a specific embodiment, the correspondence between each working mode of the sprinkler truck and the water pump speed, as well as the correspondence between water flow rate and water pump speed, can be preset.

[0075] After determining the target operating mode of the sprinkler truck, the target speed of water pump 2 can be directly determined based on the pre-set correspondence between each operating mode of the sprinkler truck and the water pump speed.

[0076] After determining the target speed of water pump 2, the target water flow rate can be directly determined based on the pre-set correspondence between water flow rate and water pump speed.

[0077] The pre-set correspondence between each working mode of the sprinkler truck and the water pump speed can be considered as a mapping relationship between the working mode of the sprinkler truck and the water pump speed.

[0078] The water flow rate is directly proportional to the pump speed. The pre-set correspondence between the water flow rate and the pump speed can be used as a calculation formula between the water flow rate and the pump speed.

[0079] Step 130: Obtain environmental parameters, including ambient temperature and ambient humidity.

[0080] In the control method of the water system of a sprinkler truck, it is also necessary to obtain environmental parameters and control the water system of the sprinkler truck according to the specific environmental conditions. This can make the sprinkling effect more in line with the actual environment and achieve water-saving effect while meeting the sprinkling requirements.

[0081] Specifically, temperature and humidity sensors can be installed on the water sweeper to detect ambient temperature and humidity.

[0082] Step 140: Determine the target gas flow rate based on the ambient humidity and the target water flow rate.

[0083] The required gas mixing ratio varies depending on the ambient humidity, even with a fixed spray width. By determining the required gas mixing ratio based on the ambient humidity, and then combining this with the target water flow rate, the target gas flow rate can be determined.

[0084] In a specific embodiment, the correspondence between ambient humidity and gas mixing ratio, as well as the calculation model for gas mixing ratio, can be preset.

[0085] Let the ambient humidity be Φ, and the gas mixing ratio be X. The relationship between ambient humidity and gas mixing ratio is as follows: .

[0086] The water flow rate in the gas-water mixture is f(n), the gas flow rate in the gas-water mixture is f(p), and the gas mixing ratio is... .

[0087] After determining the ambient humidity, the required gas mixing ratio can be directly determined based on the pre-set correspondence between ambient humidity and gas mixing ratio.

[0088] After determining the required gas mixing ratio and target water flow rate, the target gas flow rate can be calculated based on the pre-set calculation model for the gas mixing ratio.

[0089] Step 150: Obtain the pressure value at the constriction section of the venturi tube.

[0090] Specifically, a pressure sensor can be installed at the constriction section of the venturi tube 6 to directly detect the pressure value at the constriction section of the venturi tube 6.

[0091] Step 160: Determine the target output pressure of the pressure control valve based on the target gas flow rate, ambient temperature, and pressure value at the constriction section of the venturi tube.

[0092] Based on the fluid continuity equation and Bernoulli's equation, the pressure value at the throat of the Venturi tube 6 can be calculated.

[0093] Specifically, the cross-sectional area at the inlet of the contraction section of the Venturi tube 6 is A1, the water velocity at the inlet of the contraction section of the Venturi tube 6 is V1, the cross-sectional area at the throat is A2, and the water velocity at the throat is V2. A1 is greater than A2. According to the fluid continuity equation Q=V1A1=V2A2, therefore, V1 is less than V2.

[0094] Based on the target water flow rate mentioned above, V1 and V2 can be calculated and determined separately. Then, combined with Bernoulli's equation... In this formula, ρ is the density of water, p1 is the pressure at the inlet of the constriction section of the Venturi tube 6, and p2 is the pressure at the throat of the Venturi tube 6. The pressure at the throat of the Venturi tube 6 can be calculated from the pressure at the constriction section.

[0095] By consulting relevant textbooks and empirical formulas, the filling time for introducing a volume V of gas into the Venturi tube 6 is determined to be... The gas flow rate into the Venturi tube 6 Where V is the volume of gas introduced into the Venturi tube 6 in cubic meters, t is the time for introducing gas into the Venturi tube 6 in seconds, p2 is the pressure at the throat of the Venturi tube 6 in Pascals, p is the output pressure of the pressure control valve 5 in Pascals, A is the cross-sectional area of ​​the gas pipeline between the pressure control valve 5 and the throat of the Venturi tube 6 in square meters, and T0 is the thermodynamic temperature of the gas in Kelvin.

[0096] After the structure of the sprinkler truck's water system is determined, the cross-sectional area A of the gas pipeline between the pressure control valve 5 and the throat of the venturi tube 6 is determined. Therefore, based on the target gas flow rate, ambient temperature, and pressure value at the throat of the venturi tube 6, the target output pressure of the pressure control valve 5 can be calculated and determined.

[0097] Step 170: Determine the target input current of the pressure control valve based on the target output pressure.

[0098] For pressure control valve 5, different input currents result in different output pressures, and there is a corresponding relationship between input current and output pressure.

[0099] In a specific embodiment, the correspondence between the output pressure and the input current of the pressure control valve 5 can be preset. After determining the target output pressure, the target input current corresponding to the target output pressure can be directly determined based on the preset correspondence between the output pressure and the input current of the pressure control valve 5.

[0100] The pre-set correspondence between the output pressure and input current of the pressure control valve 5 can be considered as a mapping relationship between the output pressure and input current of the pressure control valve 5.

[0101] In summary, based on the target operating mode and environmental parameters of the sprinkler truck, the target speed of the water pump 2 and the target input current of the pressure control valve 5 can be determined. This allows for control of the speed of the water pump 2 and the input current of the pressure control valve 5, thereby controlling the ratio of the air-water mixture provided by the opposing spraying components. While ensuring the spray width is met, the optimal water-to-air ratio is achieved, maximizing water saving and minimizing water consumption, thus achieving the goal of water conservation.

[0102] The derivation process of the beneficial effects of the control method of the water system of the sprinkler truck in the embodiments of the present invention is largely similar to the derivation process of the beneficial effects of the water system of the sprinkler truck described above, so it will not be repeated here.

[0103] In addition, the control method for the water system of the sprinkler truck provided in this embodiment of the invention can easily achieve water-saving intelligent control, eliminating the need to determine the amount of mixed air through manual judgment, and is simple to operate.

[0104] Furthermore, embodiments of the present invention also provide a sprinkler truck, including the sprinkler truck water system provided in any of the above embodiments, or including a control device capable of executing the control method for the sprinkler truck water system provided in any of the above embodiments. It possesses all the advantages of the above-described sprinkler truck water system or its control method, which will not be repeated here. The derivation process of the beneficial effects of the sprinkler truck in the embodiments of the present invention is largely similar to the derivation process of the beneficial effects of the control method for the sprinkler truck water system or its circuit system, and therefore will not be repeated here.

[0105] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A control method for a sprinkler truck's water system, characterized in that, The water system of the sprinkler truck includes a water tank (1), a water pump (2), an air pump (3), an air tank (4), a pressure control valve (5), a venturi tube (6), a spraying assembly, and a control device. The venturi tube (6) has a converging section, a throat, and a diffuser section. The spraying assembly is connected to the diffuser section. The water tank (1) is suitable for storing water, the inlet of the water pump (2) is connected to the water tank (1), and the outlet of the water pump (2) is connected to the contraction section. The gas tank (4) is suitable for buffering gas. The air inlet of the air pump (3) is connected to the atmosphere. The air outlet of the air pump (3) and the throat are both connected to the gas tank (4). The pressure control valve (5) is located between the throat and the gas tank (4). The pressure control valve (5) is suitable for controlling the pressure of the gas entering the throat. The water pump (2) and the pressure control valve (5) are both electrically connected to the control device, which is adapted to control the speed of the water pump (2) and the output pressure of the pressure control valve (5). The control method for the water system of the sprinkler truck includes: Obtain the target operating mode of the sprinkler truck; Based on the target operating mode of the sprinkler truck, determine the target rotation speed and target water flow rate of the water pump; Acquire environmental parameters, including ambient temperature and ambient humidity; The target gas flow rate is determined based on the ambient humidity and the target water flow rate. Obtain the pressure value at the constriction section of the venturi tube; The target output pressure of the pressure control valve is determined based on the target gas flow rate, the ambient temperature, and the pressure value at the constriction section of the venturi tube. The target input current of the pressure control valve is determined based on the target output pressure.

2. The control method for the water system of a sprinkler truck according to claim 1, characterized in that, It also includes a first check valve (7) and / or a second check valve (8); The first check valve (7) is disposed between the water pump (2) and the contraction section, and the first check valve (7) is adapted to allow water to flow only from the water pump (2) to the contraction section; The second one-way valve (8) is disposed between the air pump (3) and the air tank (4), and the second one-way valve (8) is adapted to allow gas to flow only from the air pump (3) to the air tank (4).

3. The control method for the water system of a sprinkler truck according to claim 1, characterized in that, The pressure control valve (5) is a proportional pressure reducing valve.

4. The control method for the water system of a sprinkler truck according to claim 1, characterized in that, The spraying assembly includes a nozzle (9), a connecting pipe (10), and a control valve (11). At least two nozzles (9) are provided, and each nozzle (9) is provided with a corresponding connecting pipe (10). The connecting pipe (10) is provided between the nozzle (9) and the diffuser section. The control valve (11) is provided on the connecting pipeline (10), and each connecting pipeline (10) is provided with one control valve (11). The control valve (11) is adapted to control the opening and closing of the connecting pipeline (10), and the control valve (11) is electrically connected to the control device.

5. The control method for the water system of a sprinkler truck according to claim 1, characterized in that, It also includes a pressure detection element disposed in the contraction section, the pressure detection element being adapted to detect the pressure value at the contraction section, and the pressure detection element being electrically connected to the control device.

6. The control method for the water system of a sprinkler truck according to claim 1, characterized in that, The step of determining the target speed and target water flow rate of the water pump based on the target operating mode of the sprinkler truck includes: Based on the pre-set correspondence between each working mode of the sprinkler truck and the water pump speed, determine the target speed of the water pump corresponding to the target working mode of the sprinkler truck. Based on the pre-set correspondence between water flow rate and water pump speed, the target water flow rate corresponding to the target speed of the water pump is determined.

7. The control method for the water system of a sprinkler truck according to claim 6, characterized in that, The step of determining the target gas flow rate based on the ambient humidity and the target water flow rate includes: Based on the pre-set correspondence between ambient humidity and gas mixing ratio, determine the gas mixing ratio corresponding to the ambient humidity; Based on the calculation model of the gas mixing ratio and the target water flow rate, the target gas flow rate corresponding to the target water flow rate is determined.

8. The control method for the water system of a sprinkler truck according to claim 1, characterized in that, Determining the target input current of the pressure control valve based on the target output pressure includes: Based on the pre-set correspondence between the output pressure and input current of the pressure control valve, the target input current corresponding to the target output pressure is determined.

9. A sprinkler truck, characterized in that, It includes a control device capable of performing the control method for the water system of a sprinkler truck as described in any one of claims 1-8.

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