Waterway pressure circulating system and method for pesticide sprayer

Abstract

The invention discloses a water path pressure circulation system and method for a pesticide sprayer, the system comprises a pesticide liquid box, a pump, a nozzle, an internal circulation pipe group and a pesticide spraying pipe group, and the pesticide liquid box is communicated with the pump; the pesticide spraying pipe group comprises a first control valve and a pesticide spraying pipeline, the pesticide spraying pipeline comprises a pesticide spraying branch and a first loop, one end of the pesticide spraying branch is connected with the first control valve, the other end is connected with a nozzle, and the first control valve is connected with a pesticide liquid box and a pump through the first loop; the inner circulation pipe set comprises a second control valve and an inner circulation pipeline, the inner circulation pipeline comprises an inner circulation branch and a second loop, one end of the inner circulation branch is connected with the second control valve, the other end of the inner circulation branch is connected with the nozzle, a one-way valve is arranged at the end, close to the nozzle, of the inner circulation branch, and the second control valve is connected with the liquid medicine box and the pump through the second loop. By arranging the internal circulation pipe set, the problem that the pesticide spraying concentration is not uniform when pesticide spraying begins due to the fact that pesticide liquid is deposited in the pipe when the pesticide spraying machine is in a non-working state is solved.

Description

Technical Field

[0001] This invention relates to spraying equipment, and in particular to a water pressure circulation system and method for a sprayer. Background Technology

[0002] During their growth period, crops often encounter pests and diseases. To prevent these pests and diseases, people frequently use field spraying equipment to spray pesticides onto the crops. For crop growth, the evenness of pesticide spraying achieved by spraying machines can directly determine the final planting outcome of the entire field.

[0003] Many pesticides used on crops are in powder form and cannot be completely dissolved in water. They need to be thoroughly stirred in the pesticide tank before being delivered to the nozzles on the spray bar and finally sprayed out. Traditional sprayers can only guarantee the uniformity of pesticide application when the machine is operating normally. However, when the spraying device is not in operation (no pesticide spraying), the pesticide will settle in the tank or pipeline. When the spraying device restarts from a non-operational state, the pesticide sedimentation in the pipeline causes uneven pesticide concentration, resulting in inconsistent pesticide concentrations within the initial sprayed area. This severely affects the spraying effect, causing crops in some farmland areas to grow poorly due to insufficient pesticide concentration. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a water pressure circulation system and method for a pesticide sprayer. By setting up an internal circulation pipe group, the problem of uneven pesticide concentration caused by pesticide residue deposition in the pipes when the sprayer is not in operation is solved.

[0005] To achieve the above objectives, the present invention provides a water pressure circulation system for a pesticide sprayer, comprising: a pesticide tank, a pump, a nozzle, an internal circulation pipe assembly, and a spraying pipe assembly, wherein the pesticide tank is connected to the pump; the spraying pipe assembly includes a first control valve and a spraying pipeline, the spraying pipeline including a spraying branch and a first loop, one end of the spraying branch being connected to the first control valve and the other end being connected to the nozzle, the first control valve being connected to the pesticide tank and the pump through the first loop; the internal circulation pipe assembly includes a second control valve and an internal circulation pipe, the internal circulation pipe including an internal circulation branch and a second loop, one end of the internal circulation branch being connected to the second control valve and the other end being connected to the nozzle, a one-way valve being provided at the end of the internal circulation branch near the nozzle, when the one-way valve is open, the fluid in the internal circulation branch flows to the nozzle, and the second control valve being connected to the pesticide tank and the pump through the second loop.

[0006] The nozzles are multiple and are mounted on a spray bar. One end of the spray bar is connected to the spraying branch and the other end is connected to the internal circulation branch.

[0007] The first control valve is a segmented control valve, used to adjust the pressure of the fluid in the spray branch.

[0008] There are multiple spraying branches, all connected to the segmented control valve; there are multiple spray booms and internal circulation branches, and the number of spray booms and internal circulation branches corresponds to the number of spraying branches.

[0009] The second control valve is a pressure relief valve, used to regulate the pressure of the fluid in the internal circulation branch.

[0010] The first circuit includes a first branch and a second branch, wherein: the first branch is connected to the pump at its first end and to the first control valve at its last end, and the pump delivers the medicine from the medicine tank to the first control valve through the first branch; the second branch is connected to the first control valve at its first end and to the medicine tank at its last end, and the medicine from the first control valve flows back to the medicine tank through the second branch.

[0011] The second circuit includes a third branch and a fourth branch, wherein: the first end of the third branch is connected to the pump and the end is connected to the second control valve, and the pump delivers the medicine from the medicine tank to the second control valve through the third branch; the first end of the fourth branch is connected to the second control valve and the end is connected to the medicine tank, and the medicine in the second control valve flows back to the medicine tank through the fourth branch.

[0012] On the other hand, the present invention also provides a water pressure circulation method for a sprayer, employing the aforementioned water pressure circulation system for a sprayer, comprising the following steps: a preparation step, wherein the pressure in the spraying branch is set to a predetermined value by the first control valve, the predetermined value being greater than the starting working pressure value of the nozzle, and the pressure value of the fluid in the internal circulation branch is adjusted by the second control valve to be less than the starting working pressure value of the nozzle; an internal circulation step, wherein the pump delivers the liquid medicine from the liquid medicine tank to the first control valve and the second control valve, the first control valve being in a closed state, the liquid medicine flowing through the first control valve flowing back to the liquid medicine tank through the first circuit, and the liquid medicine flowing through the second control valve sequentially flowing back to the first control valve through the internal circulation branch, the one-way valve, and the spraying branch, and finally flowing back to the liquid medicine tank through the first circuit.

[0013] The water pressure circulation method for the sprayer further includes a spraying step, wherein the first control valve is adjusted to the open state, and the liquid medicine with a predetermined value flows through the first control valve to the spraying branch and starts spraying operation through the nozzle.

[0014] As can be seen from the above solutions, the advantages of the present invention are:

[0015] This invention, by setting up an internal circulation pipe group, ensures that the pump does not stop working when the sprayer is paused, and the pesticide solution in the system remains in a flowing state. This completely avoids the drawback of traditional sprayers where the pesticide solution stops flowing inside the system when spraying is paused, causing pesticide sedimentation and resulting in inconsistent pesticide concentrations in the sprayed area at the beginning of the spraying process when spraying is restarted, which seriously affects the spraying effect.

[0016] This invention features a segmented control valve that connects multiple spraying branches and an internal circulation branch, thereby improving the working efficiency of the sprayer. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the water pressure circulation system of a sprayer according to an embodiment of the present invention;

[0018] Figure 2 This is a schematic diagram of the water pressure circulation system of a sprayer according to another embodiment of the present invention;

[0019] Figure 3 This is a flowchart of the water circuit pressure circulation method for the sprayer of the present invention;

[0020] In the attached figures, the following labels are used:

[0021] 1,1'-Water pressure circulation system for the sprayer;

[0022] 10-Medicine solution tank;

[0023] 11-Pump;

[0024] 12,12'- Nozzle;

[0025] 13-Sprayer assembly;

[0026] 130 - First control valve;

[0027] 130' - Segmented control valve;

[0028] 131 - Spraying pipeline;

[0029] 131a,131a'-Spraying branch;

[0030] 131b - First Circuit;

[0031] 131b0 - First Branch Road;

[0032] 131b1 - Second Branch Road;

[0033] 14-Internal circulation pipe assembly;

[0034] 140 - Second control valve;

[0035] 141 - Internal circulation pipeline;

[0036] 141a,141a'-Inner loop branch;

[0037] 141b - Second Circuit;

[0038] 141b0 - Third Branch Road;

[0039] 141b1 - Fourth Branch Road;

[0040] 15-Rack;

[0041] 16-Spray bar;

[0042] 2-Water circuit pressure circulation method for pesticide spraying machines;

[0043] S10~S30 - Steps. Detailed Implementation

[0044] The technical solution of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments to further understand the purpose, solution and effect of the present invention, but it is not intended to limit the scope of protection of the appended claims.

[0045] References to "embodiment," "another embodiment," "this embodiment," etc., in the specification refer to embodiments that may include specific features, structures, or characteristics, but not every embodiment must include these specific features, structures, or characteristics. Furthermore, such expressions do not refer to the same embodiment. Moreover, when describing specific features, structures, or characteristics in conjunction with embodiments, whether or not explicitly described, it is indicated that incorporating such features, structures, or characteristics into other embodiments is within the knowledge of those skilled in the art.

[0046] The specification and subsequent claims use certain terms to refer to specific components or parts. Those skilled in the art will understand that users or manufacturers may use different names or terms to refer to the same component or part. This specification and claims do not distinguish components or parts by differences in name, but rather by differences in function. The terms "comprising" and "including" used throughout the specification and claims are open-ended and should be interpreted as "including but not limited to". Furthermore, the term "connection" here includes any direct and indirect electrical connection means. Indirect electrical connection means include connections via other means.

[0047] It should be noted that in the description of this invention, the terms "lateral", "longitudinal", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and "about", or "approximately", "substantially", "left and right", etc., indicating the orientation or positional relationship or parameters, are all based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, a specific size, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0048] The technical problem to be solved by this invention is to provide a water circuit pressure circulation system for a pesticide sprayer, which ensures safe internal circulation of the pesticide throughout the system when the sprayer is not in operation. At the start of spraying, the internal circulation branch is filled with the mixed spray liquid in reverse under the internal circulation pressure regulated by the second control valve. This ensures that the spraying device can spray across the entire working width at any time and maintains uniform pesticide application.

[0049] Figure 1 This is a schematic diagram of the structure of a water pressure circulation system for a sprayer (hereinafter referred to as system 1) provided in an embodiment of the present invention. The arrows indicate the direction of liquid flow. System 1 includes: liquid tank 10, pump 11, nozzle 12, spray pipe assembly 13 and internal circulation pipe assembly 14.

[0050] The spraying pipe assembly 13 includes a first control valve 130 and a spraying pipe 131. The spraying pipe 131 includes a spraying branch 131a and a first circuit 131b. One end of the spraying branch 131a is connected to the first control valve 130, and the other end is connected to the nozzle 12. The first control valve 130 is connected to the liquid tank 10 and the pump 11 through the first circuit 131b.

[0051] The internal circulation pipe assembly 14 includes a second control valve 140 and an internal circulation pipe 141. The internal circulation pipe 141 includes an internal circulation branch 141a and a second loop 141b. One end of the internal circulation branch 141a is connected to the second control valve 140, and the other end is connected to the nozzle 12. A one-way valve 142 is provided on the internal circulation branch 141a near the nozzle 12. When the pressure value in the internal circulation branch 141a is greater than the starting pressure of the one-way valve 142, the one-way valve 142 opens, allowing the fluid in the internal circulation branch 141a to flow to the nozzle 12. The second control valve 140 is connected to the medicine tank 10 and the pump 11 through the second loop 141b.

[0052] In this embodiment, pump 11 is connected to the pesticide tank 10 via a pipeline. Its function is to transport the pesticide solution in the pesticide tank 10 to the first control valve 130 and the second control valve 140. Pump 11 does not need to be stopped during the entire spraying process, and it continues to work even during periods of pause in spraying. When the first control valve 130 is open, part of the pressurized pesticide solution provided by pump 11 flows to the spraying branch 131a and then to the nozzle 12 for spraying, while the other part flows back to the pesticide tank 10 through the first circuit 131b.

[0053] Additionally, pump 11 is connected to second control valve 140 via second circuit 141b. Second control valve 140 can adjust the water pressure of internal circulation branch 141a during internal circulation. Since the water pressure in internal circulation branch 141a is less than the starting working pressure of nozzle 12, nozzle 12 cannot start spraying under internal circulation conditions. Second control valve 140 is connected to nozzle 12 via internal circulation branch 141a, and a one-way valve 142 is installed on internal circulation branch 141a to allow liquid to flow into nozzle 12. Second control valve 140 is connected to liquid tank 10 via second circuit 141b. After the pressurized liquid supplied by pump 11 flows through second control valve 140, a portion flows to internal circulation branch 141a and then into nozzle 12, finally flowing back to liquid tank 10 via spraying branch 131a and the first circuit 131b connected to spraying branch 131a. The other portion flows directly back to liquid tank 10 via second circuit 141b.

[0054] The first control valve 130 can independently control the connection between the nozzle 12 and its corresponding spraying branch 10, ensuring that the pressure value inside the spraying branch 131a is greater than the starting working pressure value of the nozzle 12 during spraying.

[0055] In this embodiment, the first circuit 131b includes a first branch 131b0 and a second branch 131b1, wherein: the first branch 131b0 is connected to a pump 11 at its beginning and to a first control valve 130 at its end, and the pump 11 delivers the medicine from the medicine tank 10 to the first control valve 130 through the first branch 131b0; the second branch 131b1 is connected to the first control valve 130 at its beginning and to the medicine tank 11 at its end, and the medicine from the first control valve 130 flows back to the medicine tank 11 through the second branch 131b1.

[0056] The second circuit 141b includes a third branch 141b0 and a fourth branch 141b1. The first end of the third branch 141b0 is connected to the pump 11, and the end is connected to the second control valve 140. The pump 11 delivers the medicine from the medicine tank 10 to the second control valve 140 through the third branch 141b0. The first end of the fourth branch 141b1 is connected to the second control valve 140, and the end is connected to the medicine tank 10. The medicine in the second control valve 140 flows back to the medicine tank 10 through the fourth branch 141b1.

[0057] Specifically, during the preparation stage of the spraying operation, the pressure inside the spraying branch 131a is set to a preset value (this preset value is greater than the starting working pressure value of the nozzle 12) through the first control valve 130; the internal circulation pressure of the internal circulation branch 141a is adjusted through the second control valve 140 to ensure that the pressure value of the internal circulation branch 141a is less than the starting working pressure value of the nozzle 12.

[0058] Pump 11 is started, and pump 11 delivers medicine from medicine tank 10 to first control valve 130 via first branch 131b0 and to second control valve 140 via third branch 141b0. First control valve 130 is closed during the preparation phase, and medicine flowing through first control valve 130 flows back to medicine tank 10 via second branch 131b1 of first circuit 131b. After flowing through second control valve 140, part of the medicine flows into nozzle 12 via internal circulation branch 141a and corresponding one-way valve 142. The liquid flows back to the first control valve 130 from the spray branch 131a connected to the nozzle 12, and finally flows back to the liquid tank 10 through the second branch 131b1 of the first circuit 131b. Another part flows directly back to the liquid tank 10 through the fourth branch 141b1. In this process, the liquid is circulated internally in the pipeline, avoiding the precipitation of the liquid. At the same time, during the internal circulation process, since the pressure value of the internal circulation branch 141a is less than the starting working pressure value of the nozzle 12, no liquid is sprayed from the nozzle 12.

[0059] When spraying is initiated, the first control valve 130 is opened, and the liquid pesticide with a preset pressure value flows through the first control valve 130 to the spraying branch 131a. Since the pressure value inside the spraying branch 131a is greater than the starting working pressure value of the nozzle 2, the nozzle 2 begins spraying. Because a one-way valve 142 is installed on the internal circulation branch 141a, the liquid pesticide cannot enter the internal circulation branch 141a through the one-way valve 142. At the same time, since the internal pressure value of the liquid pesticide in the internal circulation branch 141a is less than the pressure value inside the spraying branch 131a, the one-way valve 142 cannot be opened.

[0060] When spraying is paused, the first control valve 130 is closed. At this time, the pesticide solution cannot enter the spraying branch 131a through the first control valve 130. The pressure of the pesticide solution in the internal circulation branch 141a is greater than the pressure in the pipe of the spraying branch 131a. At this time, the one-way valve 142 opens, and the pesticide solution in the internal circulation branch 141a flows into the nozzle 12. Without starting the nozzle 12, it flows back from the spraying branch 131a to the first control valve 130, and finally flows back to the pesticide tank 10 through the second branch 131b1 of the first circuit 131b, so that the system maintains an internal circulation state of pesticide solution.

[0061] When it is necessary to restart the spraying operation, follow the above spraying start steps to carry out the spraying operation.

[0062] like Figure 2 The diagram shows a schematic of a water pressure circulation system 1' (hereinafter referred to as system 1') for a sprayer according to another embodiment of the present invention. System 1' has a basically the same structure as system 1, and will not be repeated here. The difference is that system 1' also includes a frame 15 and a spray bar 16 mounted on the frame 15. Multiple nozzles 12' are evenly distributed below the spray bar 16 via pipelines. The liquid pesticide in the spray bar 16 can be sprayed out from the nozzle 2 after exceeding the starting working pressure value of the nozzle 12'. One end of the spray bar 16 is connected to the spraying branch 131a, and the other end is connected to the internal circulation branch 141a. The first control valve 130 is a segmented control valve 130', and the second control valve is a pressure relief valve 140'. The nozzle 12' is, for example, an anti-drip nozzle.

[0063] There are multiple spraying branches 131a', all connected to the segmented control valve 130'; there are also multiple spray booms 16 and internal circulation branches 141a', and the number of spray booms 16 and internal circulation branches 141a' corresponds to the number of spraying branches 131a'. This embodiment uses four spraying branches as an example for explanation, but is not limited to this. Furthermore, the arrangement of the spray booms 16 and nozzles 15 in this embodiment (side-by-side arrangement) is only for illustration to facilitate understanding of the liquid flow direction and is not a limitation thereof. For example, the spray booms 16 can be in various forms such as circular, fan-shaped, or cross-shaped, and the nozzles can be evenly or unevenly distributed on the spray booms 16.

[0064] The following are method embodiments corresponding to the system embodiments described above. These embodiments can be implemented in conjunction with the above embodiments. The relevant technical details mentioned in the above embodiments remain valid in these embodiments, and will not be repeated here to avoid repetition. Correspondingly, the relevant technical details mentioned in these embodiments can also be applied to the above embodiments.

[0065] like Figure 3 The diagram shown is a flowchart of a water pressure circulation method 2 for a sprayer according to another embodiment of the present invention. The method employs the aforementioned water pressure circulation system 1 or system 1' and includes the following steps:

[0066] S10: Preparation step, the pressure in the spraying branch 131a is set to a predetermined value through the first control valve 130, the predetermined value is greater than the starting working pressure value of the nozzle 12, and the pressure value of the fluid in the internal circulation branch 141a is adjusted through the second control valve 140 so that it is less than the starting working pressure value of the nozzle 12.

[0067] S20: Internal circulation step, pump 11 delivers the medicine from the medicine tank 10 to the first control valve 130 and the second control valve 140. The first control valve 130 is adjusted to the closed state. The medicine flowing through the first control valve 130 flows back to the medicine tank 11 through the first circuit 131b. The medicine flowing through the second control valve 140 flows back to the first control valve 130 through the internal circulation branch 141a, the one-way valve 142, and the spraying branch 131a in sequence, and finally flows back to the medicine tank 10 through the first circuit 131b.

[0068] S30: Spraying procedure. The first control valve 130 is in the open state. The liquid medicine with the predetermined value flows through the first control valve 130 to the spraying branch 131a and starts the spraying operation through the nozzle 12.

[0069] The following detailed explanation uses System 1' as an example:

[0070] In step S10, during the preparation stage of the spraying operation, the pressure inside the spraying branch 131a' is set to a preset value through the first control valve 130 (i.e., the segmented control valve 130'); the internal circulation pressure of the internal circulation branch 141a' is adjusted through the second control valve 140 (i.e., the pressure relief valve 140') to ensure that the pressure value of the internal circulation branch 141a' is less than the starting working pressure value of the nozzle 12' (e.g., the anti-drip nozzle 12).

[0071] In step S20, pump 11 is started, and pump 11 delivers the medicine from medicine tank 10 to segmented control valve 130' and pressure relief valve 140'. Segmented control valve 130' is closed during the preparation stage, and the medicine flowing through segmented control valve 130' flows back to medicine tank 10 through the second branch 131b1 of the first circuit 131b. After flowing through pressure relief valve 140', the medicine flows into the spray bar through internal circulation branch 141a' and the corresponding one-way valve 142'. 16. After flowing back to the segmented control valve 130' from the spray branch 131a' connected to the spray bar 16, it finally flows back to the liquid tank 10 through the second branch 131b1 of the first circuit 131b. During this process, the liquid is completed in the internal circulation process of the pipeline, avoiding the precipitation state of the liquid. At the same time, during the internal circulation process, since the pressure value of the internal circulation branch 141a' is less than the starting working pressure value of the nozzle 12', no liquid is sprayed out of the nozzle 12'.

[0072] In step S30, the spraying is initiated, and the segmented control valve 130' is adjusted to the open state. The liquid medicine with the preset pressure value flows through the segmented control valve 130' to the spraying branch 131a. Since the pressure value inside the spraying branch 131a is greater than the starting working pressure value of the nozzle 12', the nozzle 12' starts spraying. Since a one-way valve 142' is installed on the internal circulation branch 141a', the liquid medicine cannot enter the internal circulation branch 141a' through the one-way valve 142'. At the same time, since the internal pressure value of the liquid medicine in the internal circulation branch 141a' is less than the pressure value inside the spraying branch 131a', the one-way valve 142' cannot be opened either.

[0073] Pause spraying and return to step S20. The segmented control valve 130' is adjusted to the closed state. At this time, the liquid pesticide cannot enter the spraying branch 131a' through the segmented control valve 130'. The liquid pesticide pressure in the internal circulation branch 141a' is greater than the pipe pressure in the spraying branch 131a'. At this time, the one-way valve 142' opens, and the liquid pesticide in the internal circulation branch 141a' flows into the nozzle 12'. Without starting the nozzle 12', it flows back from the spraying branch 131a' to the segmented control valve 130', and finally flows back to the liquid pesticide tank 10 through the first circuit 131b, so that the system maintains a liquid pesticide internal circulation state.

[0074] When it is necessary to restart the spraying operation, follow the spraying start-up steps S30 described above to carry out the spraying operation.

[0075] Stop spraying, stop pump 11, and there is no pressure liquid in the first circuit 131b and the second circuit 141b in system 1 and 1'.

[0076] In summary, the water pressure circulation system for a sprayer of the present invention achieves a continuous flow of pesticide solution within the system even when the sprayer is paused, as the pump does not stop working. This completely avoids the problem of pesticide sedimentation caused by the cessation of pesticide flow within the system when spraying is paused, which leads to inconsistent pesticide concentrations in the sprayed area at the start of spraying and severely affects the spraying effect.

[0077] The embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present invention without departing from the spirit and scope of the claims, and all of these forms fall within the scope of protection of the present invention.

Claims

1. A water pressure circulation system for a pesticide sprayer, characterized in that, include: The system includes a liquid tank, pump, nozzle, internal circulation pipe assembly, and spray pipe assembly. The medicine tank is connected to the pump; The spraying pipe assembly includes a first control valve and a spraying pipeline. The spraying pipeline includes a spraying branch and a first circuit. One end of the spraying branch is connected to the first control valve, and the other end is connected to the nozzle. The first control valve is connected to the liquid tank and the pump through the first circuit. The internal circulation pipe assembly includes a second control valve and an internal circulation pipeline. The internal circulation pipeline includes an internal circulation branch and a second loop. One end of the internal circulation branch is connected to the second control valve, and the other end is connected to the nozzle. A one-way valve is provided at the end of the internal circulation branch near the nozzle. The second control valve is connected to the medicine tank and the pump through the second loop.

2. The water pressure circulation system for the sprayer according to claim 1, characterized in that, The nozzles are multiple and are mounted on a spray bar. One end of the spray bar is connected to the spraying branch and the other end is connected to the internal circulation branch.

3. The water pressure circulation system for the sprayer according to claim 2, characterized in that, The first control valve is a segmented control valve, used to adjust the pressure of the fluid in the spray branch.

4. The water pressure circulation system for the sprayer according to claim 3, characterized in that, There are multiple spraying branches, all connected to the segmented control valve; there are multiple spray booms and internal circulation branches, and the number of spray booms and internal circulation branches corresponds to the number of spraying branches.

5. The water pressure circulation system for the sprayer according to claim 1, characterized in that, The second control valve is a pressure relief valve, used to regulate the pressure of the fluid in the internal circulation branch.

6. The water pressure circulation system for the sprayer according to claim 1, characterized in that, The first circuit includes a first branch and a second branch, wherein: The first branch is connected to the pump at one end and to the first control valve at the other end. The pump delivers the medicine from the medicine tank to the first control valve through the first branch. The first end of the second branch is connected to the first control valve, and the end is connected to the medicine tank. The medicine in the first control valve flows back to the medicine tank through the second branch.

7. The water pressure circulation system for the sprayer according to claim 1, characterized in that, The second circuit includes a third branch and a fourth branch, wherein: The first end of the third branch is connected to the pump, and the end is connected to the second control valve. The pump delivers the medicine from the medicine tank to the second control valve through the third branch. The first end of the fourth branch is connected to the second control valve, and the end is connected to the medicine tank. The medicine in the second control valve flows back to the medicine tank through the fourth branch.

8. A water pressure circulation method for a pesticide sprayer, characterized in that, The water pressure circulation system for the sprayer according to any one of claims 1 to 7 includes the following steps: The preparation steps involve setting the pressure in the spraying branch to a predetermined value through the first control valve, the predetermined value being greater than the starting working pressure value of the nozzle, and adjusting the pressure value of the fluid in the internal circulation branch to be less than the starting working pressure value of the nozzle through the second control valve. In the internal circulation step, the pump delivers the liquid medicine from the liquid medicine tank to the first control valve and the second control valve. The first control valve is adjusted to a closed state, and the liquid medicine flowing through the first control valve flows back to the liquid medicine tank through the first circuit. The liquid medicine flowing through the second control valve flows back to the first control valve in sequence through the internal circulation branch, the one-way valve, and the spraying branch, and finally flows back to the liquid medicine tank through the first circuit.

9. The water pressure circulation method for a sprayer according to claim 8, characterized in that, Also includes: In the pesticide application process, the first control valve is adjusted to the open state, and the pesticide solution with a predetermined value flows through the first control valve to the spraying branch and begins spraying through the nozzle.

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