WO2021056457A1

WO2021056457A1 - Pump assembly, spraying system, mobile device, and spraying method for mobile device

Info

Publication number: WO2021056457A1
Application number: PCT/CN2019/108688
Authority: WO
Inventors: 舒展; 周乐; 周万仁
Original assignee: 深圳市大疆创新科技有限公司
Priority date: 2019-09-27
Filing date: 2019-09-27
Publication date: 2021-04-01
Also published as: CN112153893A

Abstract

A pump assembly (100), a spraying system (10), a mobile device (1000) and a spraying method. The pump assembly (100) comprises a water pump device (110), a liquid distributor (120) and a liquid storage and exhaust structure (130), the liquid storage and exhaust structure (130) being in communication with the liquid distributor (120), and the liquid storage and exhaust structure (130) being used for storing a liquid flowing from the liquid distributor (120) or supplying the stored liquid to the liquid distributor (120), and being able to discharge gas in the pump assembly (100).

Description

Pump assembly, spray system, mobile device and spray method of mobile device

Technical field

The present invention relates to the technical field of pump assembly equipment, in particular to a pump assembly, a spray system, a mobile device, and a spray method of the mobile device.

Background technique

With the continuous improvement of environmental protection requirements, people have higher and higher requirements for the spray system to prevent leakage when spraying is stopped. Due to the effect of gravity, when the existing spraying system stops spraying, the spray nozzle usually has liquid dripping out, that is, there is a dripping problem, which causes a waste of liquid medicine and also pollutes the environment. In order to solve the problem of nozzle leakage after spraying is stopped, a normally closed pressure switch or pressure relief valve is usually set on the nozzle. When the pressure at the outlet of the spray system is greater than the pressure threshold, the spray system will perform spraying operations. When the spray is stopped, the pressure relief valve can be automatically closed to prevent liquid leakage.

However, for pluggable water tanks, that is, water tanks that can be removed from a mobile platform such as a drone, each time the water tank is plugged in or pulled out, air can easily enter the pipes of the spray system. When there is air in the pipes of the spray system, especially in the pump cavity, the pressure of the water outlet of the spray system cannot reach the above-mentioned pressure threshold, so that the pressure relief valve cannot be opened and exhausted. At this time, it is necessary to manually open the pressure relief valve to discharge the gas in the spray system, which not only takes time and effort, and increases the labor cost; moreover, because it is difficult to determine when the exhaust is completed, it is usually necessary to wait for the chemical liquid to be sprayed before closing the pressure relief valve , The amount of sprayed liquid is uncontrollable, resulting in waste of liquid medicine.

In addition, due to the flow pulsation of the water pump device and the vibration of the movable platform, the pressure and flow in the spraying system have been fluctuating, which will affect the spraying effect and the measurement accuracy of the flowmeter.

Summary of the invention

The present application provides a pump assembly, a spray system, a mobile device, and a spray method of the mobile device. It aims to add at least one liquid storage and exhaust structure between the liquid supply tank and the water pump device to solve the exhaust problem of the pressure relief valve At the same time, the liquid storage and exhaust structure can also reduce the flow pulsation and pressure fluctuation of the spray system.

In the first aspect, this application provides a pump assembly for a spray system, including:

At least one water pump device;

The liquid dispenser includes a liquid outlet pipe equal in number to the water pump device and at least one liquid inlet pipe. The liquid inlet pipe and the liquid outlet pipe are connected with the liquid supply tank of the spray system, and the liquid outlet pipe is connected between the liquid inlet pipe and the water pump device. ; Used to guide the liquid in the liquid supply tank to the water pump device;

Among them, the liquid separator is also provided with a liquid storage and exhaust structure communicating with the liquid separator. The liquid storage exhaust structure is used to store the liquid flowing into the liquid separator or supply the stored liquid to the liquid separator, and the liquid storage The exhaust structure can also exhaust the gas in the pump assembly.

In the second aspect, this application provides a spray system, which includes:

The pump assembly as described above;

The liquid supply tank is connected with the liquid inlet pipe of the pump assembly;

Nozzle assembly, used to realize spraying operation;

The liquid guide tube is connected with the water pump device of the pump assembly and the spray head assembly, and is used to transport the liquid pumped from the water pump device to the spray head assembly.

In the third aspect, this application provides a mobile device, including:

Mobile platform

The spraying system as described above is installed on a movable platform.

According to the fourth aspect of the present application, the present application provides a spraying method for a mobile device. The mobile device includes a movable platform and a spraying system provided on the movable platform. The spraying system includes a liquid supply tank, a spray head assembly, and a pump assembly. The liquid supply tank is connected to the nozzle assembly through a pump assembly, the pump assembly includes a liquid distributor and a liquid storage and exhaust structure connected with the liquid distributor, and the method includes:

Discharge at least part of the gas in the pump assembly through the liquid storage and exhaust structure;

Control the liquid in the liquid supply tank to flow to the nozzle assembly through the pump assembly.

The embodiments of the present application provide a pump assembly, a spraying system, a moving device, and a spraying method. Before the spraying operation, the liquid flows through the liquid separator, and the liquid storage and exhaust structure are connected to the liquid separator. The liquid storage exhaust structure is not only It can be used to store the liquid flowing into the liquid separator, can also supply the stored liquid to the liquid separator, and can discharge the gas in the pump assembly, so that the gas in the pump assembly can be discharged through the liquid storage and exhaust structure. The water pump device is turned on, and the pressure switch on the nozzle assembly causes the nozzle assembly to switch to the dripping working state, thereby realizing the spraying operation. Compared with pressure relief by operating a pressure switch, this pressure relief method does not need to wait for the liquid to be sprayed before turning off the pressure switch, which avoids the problem of waste of liquid medicine and/or environmental pollution. In addition, when the number of nozzle assemblies is multiple, only the pressure relief mechanism needs to be operated to open the pressure relief port to discharge the gas in the pump assembly, and there is no need to manually operate the pressure switch on each nozzle assembly to relieve the pressure. Reduce labor costs and improve pressure relief efficiency. Moreover, adding a liquid storage and exhaust structure to the dispenser is simple and easy to implement. The liquid storage and exhaust structure also functions as a secondary water tank, which can reduce flow pulsation and pressure fluctuations, thereby improving spraying quality and improving detection control Accuracy.

It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the application.

Description of the drawings

In order to explain the technical solutions of the embodiments of the present application more clearly, the following will briefly introduce the drawings used in the description of the embodiments. Obviously, the drawings in the following description are some embodiments of the present application. Ordinary technicians can obtain other drawings based on these drawings without creative work.

FIG. 1 is a schematic structural diagram of a mobile device provided by an embodiment of the present application;

2 is a schematic structural view of a pump assembly provided by an embodiment of the present application;

Fig. 3 is a schematic structural view of the pump assembly in Fig. 2 from another angle;

Fig. 4 is a partial structural diagram of a pump assembly provided by an embodiment of the present application;

Fig. 5 is a partial structural diagram of a pump assembly provided by an embodiment of the present application;

FIG. 6 is a schematic structural diagram of a pump assembly provided by an embodiment of the present application;

FIG. 7 is a partial structural diagram of a pump assembly provided by an embodiment of the present application, in which a liquid storage and exhaust structure and a liquid separation structure are shown;

Figure 8 is a cross-sectional view of the pump assembly in Figure 7 at an angle;

FIG. 9 is a schematic structural diagram of the liquid storage and exhaust structure in FIG. 7;

FIG. 10 is a schematic flowchart of a spraying method for a mobile device according to an embodiment of the present application;

Fig. 11 is a partial schematic diagram of a spray head assembly provided by an embodiment of the present application.

Label description:

1000. Mobile device;

10. Spraying system;

100. Pump components;

110. Water pump device; 110a, first water pump device; 110b, second water pump device; 110c, third water pump device; 110d, fourth water pump device;

120. Liquid dispenser; 121, liquid outlet pipe; 121a, first liquid outlet pipe; 121b, second liquid outlet pipe; 121c, third liquid outlet pipe; 121d, fourth liquid outlet pipe; 122, liquid inlet pipe;

123. Main pipe; 1231, first end; 1232, second end; 1233, first liquid distribution pipe; 1234, second liquid distribution pipe; 1235, liquid distribution structure; 12351, bottom surface; 12352, top surface; 12353, first One liquid outlet; 12354, the second liquid outlet; 12355, the liquid inlet;

130. Liquid storage and exhaust structure; 131, receiving part; 132, first through hole part; 133, second through hole part;

134. Cover; 1341. Cover; 1342. Connect; 135. Seal; 140. Opening;

200. Liquid supply tank;

300. Nozzle assembly; 310. Inlet flow channel; 320. Outlet flow channel;

400, catheter; 500, mounting bracket; 600, pressure switch; 700, flow meter;

20. Movable platform.

detailed description

The technical solutions in the embodiments of the present application will be described clearly and completely in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of them. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of this application.

The flowchart shown in the drawings is only an example, and does not necessarily include all contents and operations/steps, nor does it have to be executed in the described order. For example, some operations/steps can also be decomposed, combined or partially combined, so the actual execution order may be changed according to actual conditions.

It should be further understood that the term "and/or" used in the specification and appended claims of this application refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations .

Hereinafter, some embodiments of the present application will be described in detail with reference to the accompanying drawings. In the case of no conflict, the following embodiments and features in the embodiments can be combined with each other.

Referring to FIG. 1, an embodiment of the present application provides a mobile device 1000 including a spraying system 10 and a movable platform 20, and the spraying system 10 is installed on the movable platform 20. The mobile device 1000 is used in the agricultural industry to spray pesticides, water and other liquids on agricultural products, forests, and the like. The movable platform 20 can realize movement, rotation, turning, etc., and the movable platform 20 can drive the spraying system 10 to move to different positions or different angles to perform spraying operations in a preset area. The movable platform 20 may include an agricultural spraying vehicle, an agricultural drone, or a human-powered spraying device, etc.; or the movable platform 20 may be one of an agricultural spraying vehicle, an agricultural drone, or a human-powered spraying device in one form. In the form of agricultural spraying vehicles, agricultural drones or other types of human spraying devices.

The following description will be given by taking an example in which the movable platform 20 is an agricultural drone and the sprayed liquid is a chemical liquid. It can be understood that the specific form of the movable platform 20 is not limited to agricultural drones, and is not limited here.

Please refer to FIG. 1, in some embodiments, the spray system 10 includes a pump assembly 100, a liquid supply tank 200, a spray head assembly 300 and a liquid guide tube 400. The liquid supply tank 200 communicates with the pump assembly 100. The spray head assembly 300 is used to implement spraying operations. The pump assembly 100 includes a water pump device 110, which communicates with the spray head assembly 300 through a catheter 400, and the water pump device 110 pumps the liquid in the liquid supply tank 200 and delivers it to the spray head assembly 300 for spraying operation.

Wherein, the number of the spray head assembly 300 is at least one, which can be one, two, three, four or more, and the embodiment of the present application is not limited thereto.

Please refer to FIG. 2. Specifically, the spraying system 10 further includes a mounting bracket 500. The liquid supply tank 200 and the nozzle assembly 300 are arranged on the movable platform 20, the mounting bracket 500 is installed on the movable platform 20, the pump assembly 100 is installed on the mounting bracket 500, and the pump assembly 100 is connected to the liquid supply tank 200 and the nozzle assembly 300. The liquid supply tank 200 contains the liquid medicine to be sprayed. The liquid medicine is output to the pump assembly 100 along the catheter 400. The water pump device 110 of the pump assembly 100 operates to deliver the liquid pumped by the water pump device 110 to the spray head assembly 300 to perform spraying operations.

Please refer to FIG. 1 again. In some embodiments, the spray system 10 further includes a pressure switch 600. The pressure switch 600 is provided on the spray head assembly 300. The spray head assembly 300 can switch between the dripping working state and the stopping working state through the pressure switch 600.

Specifically, when the pressure in the spray head assembly 300 is greater than the preset pressure threshold, the pressure switch 600 is activated, so that the spray head assembly 300 is switched to the dripping working state. When the pressure in the spray head assembly 300 is less than the preset pressure threshold, the pressure switch 600 is activated, so that the spray head assembly 300 is switched to the liquid stop working state. The preset pressure threshold can be designed to any suitable value according to requirements, such as 0.15MPa, 0.2MPa, 0.3MPa, etc.

When a spraying operation is required, the pressure switch 600 is operated to make the spray head assembly 300 in a dripping working state. At this time, pesticides, water and other liquids can be sprayed. In some embodiments, when pressure needs to be relieved, the pressure switch 600 can be operated to make the spray head assembly 300 in a pressure relief working state, thereby achieving pressure relief, effectively avoiding liquid waste and environmental pollution problems caused by liquid leakage such as pesticides. Wherein, the pressure relief working state may be the same as or different from the above-mentioned liquid stop working state, and the embodiment of the present application is not limited thereto.

Due to the introduction of the pressure switch 600, when there is air in the pipe of the spray system 10, especially the pump cavity of the water pump device 110, the pressure in the pump assembly 100 cannot reach the preset pressure threshold, which makes it difficult for the pressure switch 600 to switch the nozzle assembly 300 The gas in the pump assembly 100 cannot be discharged until the pressure is released. At this time, it is necessary to manually open the pressure switch 600 to switch the spray head assembly 300 to the pressure relief working state, so as to discharge the gas in the spray system 10, which not only takes time and effort, but also increases labor costs. Moreover, with this pressure relief method, it is difficult to determine when the exhaust is completed. Usually, the pressure switch 600 needs to be turned off after the chemical liquid is sprayed, and the spray amount is uncontrollable, resulting in waste of the chemical liquid.

In response to this problem, the inventor of the present application added a liquid storage and exhaust structure 130 to the dispenser 120. The liquid storage and exhaust structure 130 is used to store the liquid flowing into the liquid separator 120 or supply the stored liquid to the liquid separator 120, and can discharge the gas in the pump assembly 100. The present application has a simple structure and is easy to implement, and the liquid storage and exhaust structure can also reduce flow pulsation and pressure fluctuations, and prevent flow pulsation and pressure fluctuations from affecting the spraying effect of the spray system 10 and the measurement accuracy of the flowmeter.

Referring to FIGS. 1 and 2, in some embodiments, the spraying system 10 further includes a flow meter 700, which is connected between the liquid inlet pipe 122 of the liquid distributor 120 and the liquid supply tank 200. The flow meter 700 is used to measure the flow rate of the liquid output from the liquid supply tank 200. When the water pump device 110 is working normally, the liquid from the liquid supply tank 200 can enter the water pump device 110 through the flow meter 700 and the liquid distributor 120, and then be pumped by the water pump device 110 to the spray head assembly 300, and the spray head assembly 300 sprays the liquid. Out. The flow meter 700 can measure the flow of the liquid supply tank 200 into the pump assembly 100. When the flow in the pump assembly 100 is large, the liquid storage and exhaust structure 130 can temporarily accommodate part of the liquid in the pump assembly 100. When the flow rate in the pump assembly 100 is small, the liquid storage and exhaust structure 130 can replenish the previously temporarily stored liquid into the pump assembly 100. In this way, flow pulsation in the pump assembly 100 can be reduced, pressure fluctuations can be reduced, spraying quality can be improved, and detection and control accuracy can be improved.

Referring to FIGS. 2 and 3, an embodiment of the present application provides a pump assembly 100 for use in a spray system 10, and includes at least one water pump device 110 and a dispenser 120. Wherein, the liquid distributor 120 includes a liquid outlet pipe 121 and at least one liquid inlet pipe 122 equal in number to the water pump device 110. The liquid inlet pipe 122 and the liquid outlet pipe 121 are in communication with the liquid supply tank 200 of the spraying system 10, and the liquid outlet pipe 121 is connected between the liquid inlet pipe 122 and the water pump device 110. The liquid is guided to the water pump device 110.

It can be understood that the number of the water pump device 110 is at least one, for example, it may be one, two, three or more, and the embodiment of the present application is not limited thereto.

Specifically, please refer to Figures 2 and 3, the liquid separator 120 is also provided with a liquid storage and exhaust structure 130 communicating with the liquid separator 120, and the liquid storage and exhaust structure 130 is used to store the liquid flow into the liquid separator 120. The liquid in the liquid storage and exhaust structure 130. The liquid storage and exhaust structure 130 can also supply the stored liquid to the liquid separator 120, and the liquid storage and exhaust structure 130 can also be used to exhaust the gas in the pump assembly 100. The position and quantity of the liquid storage and exhaust structure 130 can also be set according to actual needs, as long as it is located on the liquid distributor 120.

The liquid storage and exhaust structure 130 on the dispenser 120 can discharge the gas in the pump assembly 100, preventing the gas in the pump assembly 100 from affecting the pressure release and exhaust of the pressure switch 600 installed on the water pump device 110, thereby making the nozzle assembly 300 Can be sprayed normally. In addition, when the flow rate in the pump assembly 100 is large, part of the liquid in the pump assembly 100 can flow into the liquid storage and exhaust structure 130, so that the liquid storage and exhaust structure 130 stores part of the liquid in the pump assembly 100. When the flow rate in the pump assembly 100 is small, the liquid storage and exhaust structure 130 can replenish the previously stored liquid into the pump assembly 100. The liquid storage and exhaust structure 130 can reduce flow pulsation in the pump assembly 130, reduce pressure fluctuations, improve spraying quality, and improve detection and control accuracy. The liquid storage and exhaust structure 130 is added to the liquid separator 120, which is simple in structure and easy to implement.

Referring to FIGS. 2 and 3, in some embodiments, each liquid outlet pipe 121 is connected to a water pump device 110, and each water pump device 110 is connected to at least one nozzle assembly 300. The liquid distributor 120 is a pipe, which can divide the liquid and deliver the liquid to the at least one water pump device 110 through the at least one liquid outlet pipe 121 respectively. The water pump device 110 is used to pressurize the liquid to the spray head assembly 300 for spraying.

When the water pump device 110 is turned on for spraying, in order to prevent the gas in the dispenser 120 and the water pump device 110 from affecting the normal operation of the pressure switch 600 on the spray head assembly 300, so as to ensure that the spray head assembly 300 can normally switch to the dripping working state. The liquid container 120 is also provided with a liquid storage and exhaust structure 130, and the gas in the pump assembly 100 can be exhausted through the liquid storage and exhaust structure 130.

Referring to FIGS. 2, 3 and 5, in some embodiments, the dispenser 120 includes a main pipe 123. The main pipe 123 is connected to and communicated with the liquid outlet pipe 121 and the liquid inlet pipe 122. The liquid in the liquid supply tank 200 can enter the water pump device 110 through the liquid inlet pipe 122, the main pipe 123 and the liquid outlet pipe 121, and be pressurized by the water pump device 110 to be transported to the spray head assembly 300 for spraying.

In some embodiments, each outlet pipe 121 is provided with at least one opening 140 and/or the inlet pipe 122 is provided with at least one opening 140, and the opening 140 is opened on the outlet pipe 121 and/or the inlet pipe. Tube 122 on. Each opening 140 is correspondingly provided with a liquid storage and exhaust structure 130, and the liquid storage and exhaust structure 130 is vertically arranged on the opening 140. That is, the outlet pipe 121 is provided with at least one opening 140; or, the inlet pipe 122 is provided with at least one opening 140, please refer to FIG. 4, or, the outlet pipe 121 and the inlet pipe 122 are both provided with an opening 140. At least one opening 140. It can be understood that the opening 140 is provided at the top of the liquid outlet pipe 121 and/or the liquid inlet pipe 122, so that the liquid storage and exhaust structure 130 is vertically arranged on the opening 140, which facilitates both gas collection and liquid storage. In some embodiments, the liquid storage and exhaust structure 130 is vertically disposed on the opening 140. Of course, the liquid storage and exhaust structure 130 can also be tilted within a certain range, for example, 85°, 95°, etc., as long as the liquid storage and exhaust structure 130 can store liquid and then exhaust gas, this application does not do this. limit.

3 and 4, the pump assembly 100 with the above-mentioned liquid storage and exhaust structure 130, when air enters the pump assembly 100 from the liquid supply tank 200, the air will flow with the liquid to the vicinity of the liquid storage and exhaust structure 130. The liquid storage and exhaust structure 130 is vertically arranged on the liquid outlet pipe 121 and/or the liquid inlet pipe 122, and the upward movement of the gas causes the gas to accumulate on the top of the liquid storage and exhaust structure 130, thereby making the water pump device 110 No air or very little air enters. When the air accumulates to a certain extent, the liquid storage and exhaust structure 130 is operated to exhaust the gas. Wherein, the vertical direction is the second direction Z in FIG. 2.

Only by turning on the water pump device 110 normally, the gas in the pump assembly 100 can be discharged through the liquid storage and exhaust structure 130, so that after the liquid flows through the liquid storage and exhaust structure 130, each nozzle assembly 300 can normally switch to dripping. Liquid working state. The liquid storage and exhaust structure 130 is added to the liquid separator 120, which is simple in structure and easy to implement.

Referring to FIGS. 2 to 4, in some embodiments, the opening 140 is provided on the main pipe 123, and the opening 140 is provided with a liquid storage and exhaust structure 130. The number of liquid outlet pipes 121 can be set according to actual requirements, for example, one or more. When the number of liquid outlet pipes 121 is multiple, the plurality of liquid outlet pipes 121 are distributed on the main pipe 123 at intervals. In some embodiments, a plurality of liquid outlet pipes 121 are distributed on the main pipe 123 at symmetrical intervals. Specifically, when the number of liquid outlet pipes 121 is an even number, adjacent liquid outlet pipes 121 are distributed on the main pipe 123 at intervals, and half of the liquid outlet pipes 121 are arranged symmetrically with the other half of the liquid outlet pipes 121. When the number N of the outlet pipes 121 is an odd number, the (N-1)/2 outlet pipes 121 and the remaining (N-1)/2 outlet pipes 121 are related to the outlet pipe 121 located in the middle of the main pipe 123. Symmetrical distribution.

In some embodiments, the number of the liquid outlet pipe 121 is multiple, and the number of the water pump device 110 is multiple. The arrangement direction of the plurality of liquid outlet pipes 121 is the same as or parallel to the arrangement direction of the plurality of water pump devices 110. Specifically, referring to FIG. 2, the arrangement direction of the plurality of liquid outlet pipes 121 is the same as or parallel to the first direction X. The length extension direction of the liquid outlet pipe 121 is the same as or parallel to the second direction Z.

Referring to FIG. 6, in some embodiments, the extension direction of the main pipe 123 and the arrangement direction of the liquid outlet pipe 121 are set at an angle, that is, the length extension direction of the main pipe 123 is set at an angle with the first direction X. More specifically, the second direction Z is the direction when the agricultural drone makes a vertical movement. The distance between the first end 1231 of the main pipe 123 and the ground is greater than the distance between the second end 1232 of the main pipe 123 and the ground.

Referring to FIG. 6, when the gas in the pump assembly 100 needs to be discharged, manually operate the pressure switch 600 corresponding to the liquid outlet pipe 121 disposed adjacent to the first end 1231, so that the nozzle assembly 300 corresponding to the liquid outlet pipe 121 is in the discharge state. At this time, the gas in the pump assembly 100 can be discharged through the main pipe 123, the water pump device 110 corresponding to the liquid outlet pipe 121, and the nozzle assembly 300 corresponding to the pressure switch 600, so as to achieve pressure relief and exhaust. When the liquid medicine drips from the spray head assembly 300, the pressure switch 600 is operated, so that the spray head assembly 300 ends the pressure relief working state. At this time, when the water pump device 110 is turned on, the pressure switch 600 switches the spray head assembly 300 to the dripping working state under the action of hydraulic pressure, thereby performing normal spraying operations. This pressure relief method eliminates the need to separately operate the pressure switch 600 on each spray head assembly 300 to discharge the gas in the pump assembly 100 through the spray head assembly 300.

Please refer to FIG. 6, illustratively, the main pipe 123 is provided with four outlet pipes 121, which are the first outlet pipe 121a, the second outlet pipe 121b, the third outlet pipe 121c, and the fourth outlet pipe 121a, the second outlet pipe 121b, and the fourth Liquid pipe 121d. The four water pump devices 110 connected to the four liquid outlet pipes 121 are respectively a first water pump device 110a, a second water pump device 110b, a third water pump device 110c, and a fourth water pump device 110d. The first water pump device 110a is connected, the second liquid outlet pipe 121b is connected with the second water pump device 110b, the third liquid pipe 121c is connected with the third water pump device 110c, and the fourth liquid pipe 121d is connected with the fourth water pump device 110d. The first liquid outlet pipe 121a is arranged close to the first end 1231 of the main pipe 123, and the fourth liquid outlet pipe 121d is arranged away from the first end 1231 of the main pipe 123.

When the gas in the pump assembly 100 needs to be discharged, manually operate the pressure switch 600 corresponding to the first outlet pipe 121a (that is, the pressure switch 600 provided on the spray head assembly 300 connected to the first water pump device 110a), so that the first The nozzle assembly 300 corresponding to the water pump device 110a is in a pressure relief state. At this time, the gas in the pump assembly 100 can pass through the main pipe 123, the first water pump device 110a corresponding to the first outlet pipe 121a, and the first water pump device 110a corresponding to The nozzle assembly 300 is discharged, thereby achieving pressure relief and exhaust. Alternatively, the gas in the pump assembly is discharged through the liquid storage and exhaust structure 130 provided on the liquid separator 120 to prevent the gas from entering the water pump device 110.

Referring to FIGS. 2, 3 and 6, in some embodiments, the main pipe 123 includes a first liquid distribution pipe 1233 and a second liquid distribution pipe 1234, and the first liquid distribution pipe 1233 and the second liquid distribution pipe 1234 are symmetrically distributed. The first liquid distribution pipe 1233 and the second liquid distribution pipe 1234 are respectively communicated with at least one liquid outlet pipe 121.

In some specific embodiments, the first liquid distribution pipe 1233 and the multiple liquid distribution pipes 121 provided on the second liquid distribution pipe 1234 are integrally formed, so that there is no connection between the liquid pipe 121 and the first liquid distribution pipe 1233. Seam, there will be no risk of leakage. It should be understood that the multiple outlet pipes 121 provided on the first liquid distribution pipe 1233 and the second liquid distribution pipe 1234 can also be formed separately for easy replacement.

In some specific embodiments, the lengths of the first liquid distribution pipe 1233 and the second liquid distribution pipe 1234 are the same, and the number of liquid outlet pipes 121 provided on the first liquid distribution pipe 1233 and the second liquid distribution pipe 1234 is the same.

Referring to FIG. 5, in some embodiments, the first liquid distribution pipe 1233 and the second liquid distribution pipe 1234 are each provided with an opening 140, and the opening 140 is opened in the first liquid distribution pipe 1233 and the second liquid distribution pipe 1233 along the second direction Z. The top of the second liquid distribution pipe 1234. Each opening 140 is vertically provided with a liquid storage and exhaust structure 130.

Since the liquid storage and exhaust structure 130 is vertically arranged on the first liquid distribution pipe 1233 and the second liquid distribution pipe 1234, and the characteristic of the gas going upward, the gas will be stored in the liquid when it passes through the liquid storage and exhaust structure 130. The liquid exhaust structure 130 accumulates on the top, so that no air or very little air enters the water pump device 110. When the air accumulates to a certain extent, the liquid storage and exhaust structure 130 is operated to exhaust the gas. Moreover, the liquid storage and exhaust structure 130 can store the liquid flowing into the liquid separator 120 or supply the stored liquid to the liquid separator 120, which can reduce flow pulsation in the pump assembly 100, reduce pressure fluctuations, and improve spraying quality. Improve detection and control accuracy.

Please refer to FIG. 2, FIG. 3, and FIG. 6. In some embodiments, the liquid separator 120 further includes a liquid separating structure 1235. The liquid distribution structure 1235 is connected to and communicated with the first liquid distribution pipe 1233, the second liquid distribution pipe 1234 and the liquid inlet pipe 122. Specifically, the first liquid distribution pipe 1233, the second liquid distribution pipe 1234, and the liquid inlet pipe 122 are all connected to the liquid separation structure 1235. The first liquid distribution pipe 1233 and the second liquid distribution pipe 1234 are separately provided on two sides of the liquid distribution structure 1235 and extend in the same direction. In some embodiments, when the first liquid distribution pipe 1233, the second liquid distribution pipe 1234, and the liquid inlet pipe 122 are connected to the liquid distribution structure 1235, they are further reinforced by fasteners such as nuts.

Referring to FIGS. 2 and 3, in some embodiments, the opening 140 is provided on the liquid separation structure 1235, and the opening 140 is correspondingly provided with the liquid storage and exhaust structure 130. The gas in the pump assembly 100 is discharged through the liquid storage and exhaust structure 130, so as to achieve the purpose of pressure relief, so that the spray head assembly 300 can be sprayed normally.

Referring to FIGS. 7 to 9, in some embodiments, the liquid separating structure 1235 has a bottom surface 12351 and a top surface 12352 arranged in a vertical direction, and the opening 140 is provided on the top surface 12352. Wherein, the vertical direction is the second direction Z in FIG. 2. When air enters the pump assembly 100 from the liquid supply tank 200, the air will flow with the liquid to the vicinity of the liquid storage and exhaust structure 130. Since the liquid storage and exhaust structure 130 is vertically arranged on the top surface 12352 of the liquid separation structure 1235, The upward movement of the gas causes the gas to accumulate on the top of the liquid storage and exhaust structure 130 when passing through the liquid separation structure 1235, so that no air or very little air enters the water pump device 110. When the air accumulates to a certain extent, the liquid storage and exhaust structure 130 is operated to exhaust the gas, thereby achieving pressure relief, so that the spray head assembly 300 can be sprayed normally. Among them, the vertical direction is the second direction Z in Fig. 2.

Referring to FIG. 7, in some embodiments, the liquid distributing structure 1235 includes a first liquid outlet end 12353, a second liquid outlet end 12354, and a liquid inlet end 12355. The first liquid outlet 12353 and the second liquid outlet 12354 are symmetrically distributed. The first liquid outlet 12353 is connected to the first liquid distributing pipe 1233, and the second liquid outlet 12354 is connected to the second liquid distributing pipe 1234. The liquid inlet 12355 is connected to the liquid inlet pipe 122, and the liquid inlet 12355 is connected to the first liquid outlet 12353 and the second liquid outlet 12354.

It can be understood that the positional relationship of the first liquid outlet end 12353, the second liquid outlet end 12354, and the liquid inlet end 12355 can be set according to actual needs. For example, the extending direction of the first liquid outlet 12353 and the extending direction of the second liquid outlet 12354 are substantially the same. For another example, the first liquid outlet end 12353 and the liquid inlet end 12355 are substantially perpendicular. For another example, the second liquid outlet end 12354 is substantially perpendicular to the liquid inlet end 12355. Of course, the liquid storage and exhaust structure 130 may also be substantially perpendicular to the liquid inlet 12355. The above-mentioned solutions may exist at the same time, or there may be only one or several of them, and the embodiments of the present application are not limited thereto.

It should be noted that "A and B are approximately the same" means that A and B are the same; or, A and B are set at a preset first angle. The preset first included angle may be any suitable angle, for example, any angle between 0° and 10°.

"C and D are approximately perpendicular" means that C and D are perpendicular, or C and D are set at a preset second included angle. The preset second included angle may be any suitable angle, for example, any angle between 85° and 95°.

In some embodiments, referring to the figure, the liquid storage and exhaust structure 130 is detachably connected to the opening 140. The opening 140 is opened in at least one of the liquid outlet pipe 121, the liquid inlet pipe 122, the main pipe 123 and the liquid separating structure 1235, and the liquid storage and exhaust structure 130 is vertically installed on the opening 140.

Specifically, the connection manner between the liquid storage and exhaust structure 130 and the dispenser 120 includes at least one of the following: a threaded connection, an interference fit connection, or a snap connection. It can be understood that the first through hole portion 132 is provided with an external thread, and the opening portion 140 is provided with an internal thread. The external thread and the internal thread are matched, so that the liquid storage and exhaust structure 130 is installed on the opening 140. Alternatively, the first through hole portion 132 is provided with an internal thread, and the opening portion 140 is provided with an external thread, and the external thread is matched with the internal thread, so that the liquid storage and exhaust structure 130 is installed on the opening 140. Alternatively, the liquid storage and exhaust structure 130 is an interference fit with the opening 140, or the liquid storage and exhaust structure 130 is clamped in the opening 140. As long as the first through hole portion 132 of the liquid storage and exhaust structure 130 can be installed on the opening 140, the present application does not limit the connection manner of the liquid storage and exhaust structure 130 and the opening 140.

When air enters the pump assembly from the liquid supply tank 200, the air will flow with the liquid to the vicinity of the liquid storage and exhaust structure 130. Since the liquid storage and exhaust structure 130 is vertically arranged on the liquid distributor 120, the gas moves upward. Due to the characteristics, the gas will accumulate on the top of the liquid storage and exhaust structure 130, so that no air enters or only very little air enters in the water pump device 110. When the air accumulates to a certain extent, the lid 134 on the liquid storage and exhaust structure 130 is opened to exhaust the air.

In some embodiments, referring to FIGS. 7 to 9, the liquid storage and exhaust structure 130 includes a receiving portion 131, a first through hole portion 132 and a second through hole portion 133. The first through hole portion 132 is provided on the receiving portion 131 and connected to the opening 140, and the receiving portion 131 communicates with the dispenser 120 through the first through hole portion 132. The second through hole portion 133 is provided on the receiving portion 131, and the second through hole portion 133 is used for exhausting the gas in the receiving portion 131. It can be understood that the first through hole portion 132 and the second through hole portion 133 are respectively provided at opposite ends of the receiving portion 131, and both the first through hole portion 132 and the second through hole portion 133 are communicated with the receiving portion 131. The gas in the pump assembly 100 enters the receiving portion 131 through the first through hole portion 132, and when the air in the receiving portion 131 collects to a certain degree, the gas is discharged through the second through hole portion 133. In some embodiments, a section above the receiving portion 131 close to the second through hole portion 133 is sealed air, which functions as an air spring. At this time, the liquid storage and exhaust structure 130 is equivalent to a secondary water tank, which can relieve pressure and flow pulsation, improve spraying quality, and improve detection and control accuracy.

In some embodiments, referring to FIG. 8, the first through-hole portion 132 is installed on the opening portion 140, and a sealing member 135 is provided between the first through-hole portion 132 and the opening portion 140. The sealing member 135 can prevent liquid from flowing from the first through-hole portion 132 and the opening portion 140. A connection between the through hole 132 and the opening 140 leaks out of the pump assembly 100, which improves the sealing performance of the pump assembly 100. The sealing member 135 may be a sealing ring made of elastic materials such as rubber, and the embodiment of the present application is not limited thereto.

Specifically, referring to FIG. 9, the axis of the first through-hole portion 132 and the axis of the second through-hole portion 133 are substantially coincident. It should be noted that "substantially coincident" means that the axis of the first through-hole portion 132 and the axis of the second through-hole portion 133 coincide, or the two are arranged at a preset first included angle. The preset first included angle may be any suitable angle, for example, any angle between 0° and 10°. And/or, the outer circumference size of the first through hole portion 132 and the outer circumference size of the second through hole portion 133 are both smaller than the outer circumference size of the receiving portion 131.

In some embodiments, referring to FIGS. 7 and 8, the liquid storage and exhaust structure 130 further includes a cover member 134, the cover member 134 is detachably connected to the second through hole portion 133, and the cover member 134 is used to cover The second through hole 133. Specifically, the covering member 134 includes a covering portion 1341 and a connecting portion 1342, and the covering portion 1341 is used to block the second through hole portion 133. The connecting portion 1342 is protruded on the cover portion 1341, and the connecting portion 1342 is connected to the second through hole portion 133. The connecting portion 1342 is connected to the second through-hole portion 133 by interference fit, and the connecting portion 1342 is sleeved on the outer periphery of the second through-hole portion 133.

Specifically, the liquid storage and exhaust structure 130 includes a structure made of a flexible material or an elastic material. Exemplarily, the liquid storage and exhaust structure 130 is made of PE or PP. PE is polyethylene. PE has excellent low temperature resistance, good chemical stability, and can withstand most acids and alkalis. Therefore, the liquid storage and exhaust structure made of PE can be applied to the supply and exhaust of most liquids. PP is polypropylene, which has high impact resistance, strong mechanical properties, and resistance to a variety of organic solvents and acid and alkali corrosion. Therefore, the liquid storage and exhaust structure made of PP can be applied to the supply and exhaust of most liquids. As long as the liquid storage and exhaust structure 130 is made of stable materials, can withstand the erosion of most acids and alkalis, and can meet the performance of liquid storage and exhaust, the embodiment of the present application is not limited to this.

The cover 134 also adopts a structure made of a flexible material or an elastic material. Exemplarily, the cover 134 is made of fluorine rubber. The fluorine rubber has heat resistance, oxidation resistance, oil resistance, corrosion resistance and atmospheric aging resistance, which can satisfy the use of the cover 134 in the liquid storage and exhaust structure 130. As long as the material made of the cover member can resist oxidation and corrosion, and meet the application environment of spraying, the embodiments of the present application are not limited to this.

In the pump assembly 100, the spray system 10, and the mobile device 1000 of the above embodiment, before the spraying operation, the gas in the pump assembly 100 can be collected in the liquid storage and exhaust structure 130, so that the gas in the pump assembly 100 can pass through the liquid storage The second through hole portion 133 on the exhaust structure 130 exhausts. During the spraying operation, the water pump device 110 can be turned on, and the pressure switch 600 on the spray head assembly 300 operates to switch the spray head assembly 300 to the dripping working state, thereby realizing the spraying operation. Compared with the pressure relief method by operating the pressure switch 600, this pressure relief method does not need to wait for the liquid to be sprayed before turning off the pressure switch 600, which avoids the problem of liquid chemical waste and/or environmental pollution.

In addition, when the number of nozzle assemblies 300 is multiple, only the liquid storage and exhaust structure 130 is required to discharge the gas in the pump assembly 100, and there is no need to manually operate the pressure switch 600 on each nozzle assembly 300 to relieve the pressure. , Which reduces labor costs and improves pressure relief efficiency. Moreover, the accommodating portion 131 on the liquid storage and exhaust structure 130 can also be used to store the liquid flowing into the liquid separator 120 or supply the stored liquid to the liquid separator 120. When the flow rate in the pump assembly 100 is large, the liquid storage and exhaust structure 130 can temporarily accommodate part of the liquid in the pump assembly 100. When the flow rate in the pump assembly 100 is small, the liquid storage and exhaust structure 130 can replenish the previously temporarily stored liquid into the pump assembly 100. In this way, flow pulsation in the pump assembly 100 can be reduced, pressure fluctuations can be reduced, spraying quality can be improved, and detection and control accuracy can be improved.

Please refer to Fig. 10, which is a schematic flowchart of a spraying method for a mobile device according to an embodiment of the present application, which can be applied to the mobile device in the above-mentioned embodiment. The mobile device includes a movable platform and a spraying system arranged on the movable platform. The movable platform includes at least one of agricultural drones, agricultural spraying vehicles, and human-powered spraying devices. The spray system includes a liquid supply tank, a spray head assembly and a pump assembly. The liquid supply tank is connected with the nozzle assembly through the pump assembly. The pump assembly includes a liquid dispenser with a liquid storage and exhaust structure.

As shown in FIG. 10, the spraying method of the mobile device of this embodiment includes step S31 to step S32.

Step S31: exhaust at least part of the gas in the pump assembly through the liquid storage and exhaust structure.

Step S32: Control the liquid in the liquid supply tank to flow to the nozzle assembly through the pump assembly.

In the spraying method of the mobile device in the foregoing embodiment, at least part of the gas of the spraying system 10 is discharged through the liquid storage and exhaust structure 130 first. The liquid in the liquid supply tank 200 is controlled to flow through the pump assembly 100 to the spray head assembly 300 to realize the spraying operation. Compared with pressure relief by operating the pressure switch on the spray head assembly 300, this pressure relief method does not need to wait for the liquid to be sprayed before turning off the pressure switch, which avoids the problem of liquid chemical waste and/or environmental pollution. In addition, when the number of nozzle assemblies is multiple, the gas in the pump assembly 100 can be exhausted only by the liquid flowing through the liquid storage and exhaust structure 130, and there is no need to manually operate the pressure switch 600 on each nozzle assembly 300 to vent. It reduces the labor cost and improves the efficiency of pressure relief.

Moreover, when the flow rate in the pump assembly 100 is large, the liquid storage and exhaust structure 130 can temporarily accommodate part of the liquid in the pump assembly 100. When the flow rate in the pump assembly 100 is small, the liquid storage and exhaust structure 130 can replenish the previously temporarily stored liquid into the pump assembly 100. The liquid storage and exhaust structure 130 collects gas, so that a section above the receiving portion 131 near the second through hole portion 133 is filled with sealed air, which acts as an air spring, so that the liquid in the liquid separator 120 enters the liquid storage and exhaust structure 130 At the same time, it has a certain buffering effect. Adding the liquid storage and exhaust structure 130 to the liquid dispenser 120 can reduce flow pulsation in the pump assembly 100, reduce pressure fluctuations, improve spraying quality, and improve detection and control accuracy.

Referring to FIG. 11, in some embodiments, the mobile device 1000 includes a pressure switch 600 provided on the spray head assembly 300, and the spray head assembly 300 includes an inlet flow channel 310 and an outlet flow channel 320. The spraying method of the mobile device 1000 further includes: when the pressure in the spray head assembly 300 is greater than the preset pressure threshold, the pressure switch is actuated to conduct the inlet flow channel 310 and the outlet flow channel 320, so that the spray head assembly 300 is in the dripping operation. When the pressure in the spray head assembly 300 is less than or equal to the pressure threshold, the pressure switch acts to close the conduction between the inlet flow passage 310 and the outlet flow passage 320, so that the spray head assembly 300 is located in the liquid stop Working state to prevent liquid leakage.

Referring to FIG. 2, in some embodiments, the mobile device 1000 includes a pressure switch 600 provided on the spray head assembly 300, and the mobile device 1000 includes a flow meter 700 provided on the pump assembly 100. The spraying method of the mobile device 1000 further includes: when the liquid flow rate in the liquid separator 120 is not less than a preset flow rate threshold or the pump assembly 100 pumps liquid, the liquid storage and exhaust structure 130 stores the liquid flowing into the liquid separator 120. When the liquid flow rate in the liquid separator 120 is less than the preset flow rate threshold or the pump assembly 100 sucks liquid from the liquid separator 120, the liquid in the liquid storage and exhaust structure 130 is supplied to the liquid separator 120. In this way, flow pulsation in the pump assembly 100 can be reduced, pressure fluctuations can be reduced, spraying quality can be improved, and detection and control accuracy can be improved.

In some embodiments, the movable platform 20 is at least one of an agricultural drone, an agricultural spraying vehicle, and a human spraying device.

The above are only specific implementations of this application, but the protection scope of this application is not limited to this. Anyone familiar with the technical field can easily think of various equivalents within the technical scope disclosed in this application. Modifications or replacements, these modifications or replacements shall be covered within the scope of protection of this application. Therefore, the protection scope of this application should be subject to the protection scope of the claims.

Claims

A pump assembly used in a spray system, characterized in that it comprises:

At least one water pump device;

A liquid dispenser includes a liquid outlet pipe equal to the number of the water pump device and at least one liquid inlet pipe, the liquid inlet pipe and the liquid outlet pipe are in communication with the liquid supply tank of the spray system, and the liquid outlet pipe Connected between the liquid inlet pipe and the water pump device; used to guide the liquid in the liquid supply tank to the water pump device;

Wherein, the liquid separator is also provided with a liquid storage and exhaust structure communicating with the liquid separator, and the liquid storage and exhaust structure is used to store the liquid flowing into the liquid separator or supply the stored liquid To the dispenser, and able to discharge the gas in the pump assembly.
The pump assembly according to claim 1, wherein each of the liquid outlet pipes is provided with at least one liquid storage and exhaust structure; and/or,

At least one liquid storage and exhaust structure is provided on the liquid inlet pipe.
The pump assembly of claim 1, wherein the dispenser comprises:

The main pipe connects the liquid outlet pipe and the liquid inlet pipe.
The pump assembly according to claim 3, wherein the liquid storage and exhaust structure is provided on the main pipe.
The pump assembly according to claim 3, wherein the number of the liquid outlet pipes is multiple, and the plurality of liquid outlet pipes are distributed on the main pipe at symmetrical intervals.
The pump assembly according to claim 3, wherein the extension direction of the main pipe and the cross section of the water pump device are arranged to intersect; and/or,

The liquid outlet pipe has a liquid outlet connected to the water pump device, and the arrangement direction of the plurality of liquid outlets is parallel to the cross section of the water pump device; and/or;

The arrangement direction of the plurality of liquid outlet pipes is parallel to the extension direction of the main pipe.
The pump assembly of claim 3, wherein the main pipe comprises:

The first liquid distribution pipe and the second liquid distribution pipe are symmetrically distributed, and the first liquid distribution pipe and the second liquid distribution pipe are respectively connected with at least one of the liquid outlet pipes.
The pump assembly according to claim 7, wherein the liquid distributor further comprises: a liquid distribution structure connected to and communicated with the first liquid distribution pipe, the second liquid distribution pipe, and the liquid inlet tube.
The pump assembly according to claim 7, wherein the first liquid distribution pipe and the second liquid distribution pipe are both provided with the liquid storage and exhaust structure.
The pump assembly according to claim 8, wherein the liquid storage and exhaust structure is provided on the liquid separation structure.
The pump assembly according to claim 10, wherein the liquid separation structure is provided with a bottom surface and a top surface in a first direction of the liquid separation structure, and the liquid storage and exhaust structure is provided on the top surface .
The pump assembly according to claim 8, wherein the liquid distributing structure comprises:

Symmetrically distributed first liquid outlet and second liquid outlet, the first liquid outlet is connected with the first liquid distribution pipe, and the second liquid outlet is connected with the second liquid distribution pipe;

The liquid inlet is connected with the liquid inlet pipe and is connected to the first liquid outlet and the second liquid outlet.
The pump assembly according to claim 12, wherein the first liquid outlet, the liquid storage and exhaust structure, and the liquid inlet are perpendicular to each other in pairs; and/or,

The second liquid outlet, the liquid storage and exhaust structure, and the liquid inlet are perpendicular to each other in pairs.
The pump assembly according to claim 1, wherein an opening is provided on the liquid distributor, and the liquid storage and exhaust structure is detachably connected to the opening.
The pump assembly according to claim 14, wherein the connection manner between the liquid storage and exhaust structure and the liquid dispenser includes at least one of the following:

Threaded connection, interference fit connection or snap connection.
The pump assembly according to claim 14, wherein the liquid storage and exhaust structure comprises:

Containment department

The first through hole portion is provided on the receiving portion and connected to the opening portion, and communicates with the receiving portion and the dispenser;

The second through hole portion is provided on the receiving portion and used for exhausting the gas in the receiving portion.
The pump assembly according to claim 16, wherein the first through hole portion and the second through hole portion are respectively provided at opposite ends of the receiving portion.
The pump assembly according to claim 17, wherein the axis of the first through hole portion is substantially coincident with the axis of the second through hole portion; and/or,

The outer circumferential size of the first through hole portion and the outer circumferential size of the second through hole portion are both smaller than the outer circumferential size of the receiving portion.
The pump assembly according to claim 16, wherein the liquid storage and exhaust structure further comprises:

The cover member is detachably connected to the second through hole portion, and is used to cover the second through hole portion.
The pump assembly of claim 19, wherein the cover member comprises:

The cover part is used to block the second through hole part;

The connecting portion is protrudingly provided on the cover portion and connected with the second through hole portion.
The pump assembly according to claim 20, wherein the connecting portion is connected with the second through hole portion by interference fit.
22. The pump assembly of claim 20, wherein the connecting portion is sleeved on the outer periphery of the second through hole portion.
The pump assembly according to claim 1, wherein the liquid storage and exhaust structure comprises a structure made of a flexible material or an elastic material.
The pump assembly according to claim 1, wherein the pump assembly further comprises a seal, which is arranged at the connection between the liquid storage and exhaust structure and the liquid dispenser.
The pump assembly of claim 1, wherein the pump assembly further comprises:

The flow meter is arranged between the liquid supply tank and the water pump device.
A spraying system, characterized in that, the spraying system comprises:

The pump assembly according to any one of claims 1-25;

The liquid supply tank is in communication with the liquid inlet pipe of the pump assembly;

Nozzle assembly, used to realize spraying operation;

The catheter is connected with the water pump device of the pump assembly and the spray head assembly, and is used to deliver the liquid pumped from the water pump device to the spray head assembly.
The spray system of claim 26, wherein the spray system further comprises:

The pressure switch is arranged on the spray head assembly, and the spray head assembly can switch between the dripping working state and the liquid stopping working state through the pressure switch.
A mobile device, characterized in that it comprises:

Mobile platform

The spraying system according to claim 26 or 27, installed on the movable platform.
The mobile device according to claim 28, wherein the movable platform is at least one of an agricultural drone, an agricultural spraying vehicle, and a human spraying device.
A spraying method for a mobile device, characterized in that the mobile device includes a movable platform and a spraying system provided on the movable platform, the spraying system includes a liquid supply tank, a spray head assembly, and a pump assembly. The liquid supply tank is connected to the spray head assembly through the pump assembly, the pump assembly includes a liquid distributor and a liquid storage and exhaust structure communicating with the liquid distributor, and the method includes:

Exhaust at least part of the gas in the pump assembly through the liquid storage and exhaust structure;

The liquid in the liquid supply tank is controlled to flow to the spray head assembly through the pump assembly.
The spraying method of a mobile device according to claim 30, wherein the mobile device comprises a pressure switch provided on the spray head assembly, and the spray head assembly includes an inlet flow channel and an outlet flow channel; Methods also include:

When the pressure in the nozzle assembly is greater than a preset pressure threshold, the pressure switch operates to conduct the liquid inlet flow channel and the liquid outlet flow channel;

When the pressure in the nozzle assembly is less than or equal to the pressure threshold, the pressure switch operates to close the conduction between the liquid inlet flow channel and the liquid outlet flow channel.
The spraying method of a mobile device according to claim 30, wherein the mobile device comprises a flow meter provided on the pump assembly, and the method further comprises:

When the liquid flow rate in the liquid separator is not less than a preset flow rate threshold or the water pump device pumps out liquid, the liquid storage and exhaust structure stores the liquid flowing into the liquid separator;

When the liquid flow rate in the liquid separator is less than a preset flow rate threshold or the water pump device sucks liquid from the liquid separator, the liquid in the liquid storage and exhaust structure is supplied to the liquid separator.
The spraying method of a mobile device according to any one of claims 30 to 32, wherein the mobile platform is at least one of an agricultural drone, an agricultural spraying vehicle, and a human spraying device.