PWM variable nozzle pressure impact eliminating device and method

Abstract

The invention discloses a PWM variable spray head pressure impact eliminating device and method, and relates to the technical field of variable spraying. The device comprises a pesticide box, a pesticide pump, a power unit, a water pipe, a valve body, a control unit, a PWM variable spray head fixing rod and a PWM variable spray head. The power unit is connected with the pesticide pump; the pesticide pump is further connected with an outlet of the pesticide box and the valve body through the water pipe. The valve body is further connected with an inlet of the pesticide box and the PWM variable spray head fixing rod. The PWM variable spray head is further arranged on the PWM variable spray head fixing rod; and the PWM variable nozzle is also connected with the control unit. The water hammer impact phenomenon caused by high-frequency opening and closing of the PWM variable nozzle can be effectively reduced, the system pressure is stabilized, the service life of the PWM variable nozzle is prolonged, and the spraying effect of the PWM variable nozzle is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of variable spraying, and in particular to a PWM variable nozzle pressure shock elimination device and method. Background Art

[0002] In recent years, with the development of precision pesticide application technology, the application of variable flow control technology of spray system based on pulse width modulation (PWM) has become more and more widespread. Agricultural machinery companies represented by John Deere, TJeet Spray Company and Ningbo Licheng Agricultural Spray Technology Co., Ltd. have commercialized corresponding precision variable spray control systems, which have shown significant effects in pesticide conservation. PWM variable spray control needs to be based on PWM variable nozzles. By installing PWM solenoid valves at each nozzle position of the sprayer, the solenoid valves are controlled to open and close, and the flow and spray position of a single nozzle are independently controlled. However, due to the randomness of the distribution of crops, pests or weeds in the same plot, the opening time of nozzles at different positions during the operation of the same sprayer is different. Differentiated nozzle opening and closing actions will affect the overall pressure change of the spray system, especially the high-frequency opening and closing of the nozzles will cause water hammer phenomenon. The pressure shock caused by the water hammer phenomenon has fatal damage to the PWM variable nozzle, seriously affecting the service life and spray effect, which is not conducive to the popularization of variable spraying technology. Summary of the invention

[0003] The purpose of the present invention is to provide a PWM variable nozzle pressure shock elimination device and method, which can effectively reduce the water hammer shock phenomenon caused by the high-frequency opening and closing of the PWM variable nozzle, stabilize the system pressure, and improve the service life and spray effect of the PWM variable nozzle.

[0004] To achieve the above object, the present invention provides the following solutions:

[0005] A PWM variable nozzle pressure shock elimination device, comprising: a medicine box, a medicine pump, a power unit, a water pipe, a valve body, a control unit, a PWM variable nozzle fixing rod and a PWM variable nozzle;

[0006] The power unit is connected to the medicine pump; the medicine pump is also connected to the outlet of the medicine box and the valve body respectively through the water pipe; the valve body is also connected to the inlet of the medicine box and the PWM variable nozzle fixing rod respectively; the PWM variable nozzle is also provided on the PWM variable nozzle fixing rod; the PWM variable nozzle is also connected to the control unit.

[0007] Optionally, the PWM variable nozzle specifically includes: a nozzle cap, a solenoid valve, an internal pipeline, a nozzle body, a one-way valve, a pressure shock elimination device and a nozzle;

[0008] The nozzle is also provided on the nozzle cap, and the nozzle cap is arranged at the end of the nozzle body; the internal pipeline is arranged inside the nozzle body; the solenoid valve, the one-way valve and the pressure shock elimination device are also arranged outside the nozzle body; the one-way valve is also connected to the pressure shock elimination device.

[0009] Optionally, the pressure shock elimination device specifically comprises: a sealing ring, a gasket, a cavity, a fixing cap, a gasket, a spring and an electromagnetic coil;

[0010] The fixing cap is coaxially sleeved on the outside of the cavity, a sealing ring is arranged between the fixing cap and the cavity, an electromagnetic coil is threadedly connected to the rear end of the fixing cap, a compression spring is arranged between the electromagnetic coil and the cavity, the compression spring abuts against the electromagnetic coil and the cavity, a gasket is arranged between the electromagnetic coil and the fixing cap; the gasket is arranged between the cavity and the spray body.

[0011] The present invention also provides a method for eliminating pressure shock of a PWM variable nozzle, which is applied to the device as described above and is characterized by comprising:

[0012] The control unit is used to send PWM pulse signals of different phases to the solenoid valve and the pressure shock elimination device in the PWM variable nozzle, and the opening and closing actions of the solenoid valve and the pressure shock elimination device in the PWM variable nozzle are controlled according to the PWM pulse signals.

[0013] Optionally, control signals received by the solenoid valve and the pressure shock elimination device are out of phase.

[0014] Optionally, the control process of the PWM pulse signal is: when the control signal received by the solenoid valve is at a high level, the control signal received by the pressure shock elimination device is at a low level; the high level is used to control the device to turn on; the low level is used to control the device to turn off.

[0015] According to the specific embodiments provided by the present invention, the present invention discloses the following technical effects:

[0016] The present invention discloses a device and method for eliminating pressure shock of a PWM variable nozzle, the device comprising a medicine box, a medicine pump, a power unit, a water pipe, a valve body, a control unit, a PWM variable nozzle fixing rod and a PWM variable nozzle; the power unit is connected to the medicine pump; the medicine pump is also connected to the outlet of the medicine box and the valve body respectively through the water pipe; the valve body is also connected to the inlet of the medicine box and the PWM variable nozzle fixing rod respectively; the PWM variable nozzle is also provided on the PWM variable nozzle fixing rod; the PWM variable nozzle is also connected to the control unit. The present invention can effectively eliminate the water hammer shock phenomenon caused by high-frequency opening and closing of the PWM variable nozzle, stabilize the system pressure, and improve the service life and spray effect of the PWM variable nozzle. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0018] Figure 1 It is a structural schematic diagram of a PWM variable nozzle pressure shock elimination device of the present invention;

[0019] Figure 2 This is a schematic diagram of the structure of the PWM variable nozzle in this embodiment;

[0020] Figure 3 It is a structural schematic diagram of the pressure shock elimination device in this embodiment;

[0021] Figure 4 Schematic diagram of PWM signals with different phases in this embodiment.

[0022] Reference numerals:

[0023] 1. Medicine box; 2. Medicine pump; 3. Power unit; 4. Water pipe; 5. Valve body; 6. Control unit; 7. PWM variable nozzle fixing rod; 8. PWM variable nozzle; 9. Droplets; 10. Nozzle cap; 11. Solenoid valve; 12. Internal pipeline; 13. Spray body; 14. One-way valve; 15. Pressure shock elimination device; 16. Nozzle; 17. Sealing ring; 18. Gasket; 19. Cavity; 20. Fixing cap; 21. Gasket; 22. Spring; 23. Solenoid coil. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] The purpose of the present invention is to provide a PWM variable nozzle pressure shock elimination device and method, which can effectively reduce the water hammer shock phenomenon caused by the high-frequency opening and closing of the PWM variable nozzle, stabilize the system pressure, and improve the service life and spray effect of the PWM variable nozzle.

[0026] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] The present invention provides a PWM variable nozzle 8 pressure shock elimination device 15, comprising: a medicine box 1, a medicine pump 2, a power unit 3, a water pipe 4, a valve body 5, a control unit 6, a PWM variable nozzle fixing rod 7 and a PWM variable nozzle 8.

[0028] Specifically, the power unit 3 is connected to the medicine pump 2; the medicine pump 2 is also connected to the outlet of the medicine box 1 and the valve body 5 respectively through the water pipe 4; the valve body 5 is also connected to the inlet of the medicine box 1 and the PWM variable nozzle fixing rod 7 respectively; the PWM variable nozzle 8 is also provided on the PWM variable nozzle fixing rod 7; the PWM variable nozzle 8 is also connected to the control unit 6.

[0029] As a specific implementation, the PWM variable nozzle 8 specifically includes: a nozzle cap 10, a solenoid valve 11, an internal pipeline 12, a spray body 13, a one-way valve 14, a pressure shock elimination device 15 and a nozzle 16.

[0030] The nozzle 16 is also provided on the nozzle cap 10, and the nozzle cap 10 is provided at the end of the spray body 13; the internal pipeline 12 is provided inside the spray body 13; the solenoid valve 11, the one-way valve 14 and the pressure shock elimination device 15 are also provided outside the spray body 13; the one-way valve 14 is also connected to the pressure shock elimination device 15.

[0031] Based on the above device, a method is further provided, including: using the control unit 6 to send PWM pulse signals of different phases to the solenoid valve 11 and the pressure shock elimination device 15 in the PWM variable nozzle 8, and controlling the opening and closing actions of the solenoid valve 11 and the pressure shock elimination device 15 in the PWM variable nozzle 8 according to the PWM pulse signal.

[0032] As a specific embodiment, it includes the following contents.

[0033] In this embodiment, the overall device structure is as follows: Figure 1 As shown, it is mainly composed of a medicine box 1, a medicine pump 2, a power unit 3, a water pipe 4, a valve body 5, a control unit 6, a PWM variable nozzle fixing rod 7 and a PWM variable nozzle 8. The PWM variable nozzle 8 is composed of Figure 2 As shown, it is mainly composed of a nozzle cap 10, a solenoid valve 11, an internal pipeline 12, a spray body 13, a one-way valve 14 and a pressure shock elimination device 15. When working, the control unit 6 sends a PWM pulse signal to the solenoid valve 11, and the solenoid valve 11 is actuated to realize the opening and closing of the nozzle pipeline, thereby controlling the opening time of the nozzle to realize the precise control of the spray volume and spray position; during the operation of the solenoid valve 11, the pressure shock elimination device 15 will also act according to the information of the control unit 6. When the solenoid valve 11 is opened, the pressure shock elimination device 15 is closed, and the pipeline system flow is sprayed from the nozzle along the internal pipeline 12; when the solenoid valve 11 is closed, the pressure shock elimination device 15 is opened, and the pipeline system flow is realized through the pressure shock elimination device 15 to realize internal microcirculation flow, reducing the system pressure shock caused by the instantaneous closure of the solenoid valve 11. At the same time, the one-way valve 14 ensures that the pipeline system flow can only flow through the pressure shock elimination device 15 first. When the solenoid valve 11 is opened and the pressure shock elimination device is closed, the pipeline system flow will not flow to the pipeline between the one-way valve 14 and the pressure shock elimination device 15.

[0034] Pressure shock elimination device 15 such as Figure 3 As shown, it is mainly composed of a sealing ring 17, a gasket 18, a cavity 19, a fixing cap 20, a gasket 21, a spring 22 and an electromagnetic coil 23. It is installed in the pipeline system through the fixing cap 20. The electromagnetic coil 23 will generate suction through the PWM signal to drive the cavity 19 to realize the opening and closing control of the pipeline system. The spring 22 plays a buffering role during the action. The opening and closing action frequency of the pressure shock elimination device can be adjusted by changing the PWM signal frequency to match the action frequency of the solenoid valve 11.

[0035] In actual operation, the control unit 6 generates PWM signals of different phases, such as Figure 4 As shown, the control signal of the solenoid valve 11 and the control signal of the pressure shock elimination device are out of phase. When the control signal of the solenoid valve 11 is high, the control signal of the pressure shock elimination device is low. This ensures that when the solenoid valve 11 is turned on, the pressure shock elimination device is turned off, and when the solenoid valve 11 is turned off, the pressure shock elimination device is turned on, thereby achieving the pressure shock elimination described above. The control process can also generate multiple channels through the control unit 6 Figure 4The signal shown eliminates the pressure shock of multiple nozzles, thereby stabilizing the pressure of the entire spray system. It can not only reduce the damage to the service life of the nozzle and the solenoid valve 11 caused by the pressure shock during the variable control process of a single nozzle, but also improve the spray effect of a single nozzle and improve the pest control effect.

[0036] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0037] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A PWM variable nozzle pressure shock elimination device, characterized in that: include: Medicine box, medicine pump, power unit, water pipe, valve body, control unit, PWM variable nozzle fixing rod and PWM variable nozzle; The power unit is connected to the medicine pump; the medicine pump is also connected to the outlet of the medicine box and the valve body respectively through the water pipe; the valve body is also connected to the inlet of the medicine box and the PWM variable nozzle fixing rod respectively; the PWM variable nozzle is also provided on the PWM variable nozzle fixing rod; the PWM variable nozzle is also connected to the control unit.

2. The PWM variable nozzle pressure shock elimination device according to claim 1, characterized in that: The PWM variable nozzle specifically includes: a nozzle cap, a solenoid valve, an internal pipeline, a nozzle body, a one-way valve, a pressure shock elimination device and a nozzle; The nozzle is also provided on the nozzle cap, and the nozzle cap is provided at the end of the nozzle body; the internal pipeline is provided inside the nozzle body; the solenoid valve, the one-way valve and the pressure shock elimination device are also provided outside the nozzle body; the one-way valve is also connected to the pressure shock elimination device.

3. The PWM variable nozzle pressure shock elimination device according to claim 2, characterized in that: The pressure shock elimination device specifically includes: a sealing ring, a gasket, a cavity, a fixing cap, a gasket, a spring and an electromagnetic coil; The fixing cap is coaxially sleeved on the outside of the cavity, a sealing ring is provided between the fixing cap and the cavity, an electromagnetic coil is threadedly connected to the rear end of the fixing cap, a compression spring is provided between the electromagnetic coil and the cavity, the compression spring abuts against the electromagnetic coil and the cavity, a gasket is provided between the electromagnetic coil and the fixing cap; the gasket is provided between the cavity and the spray body.

4. A method for eliminating pressure shock of a PWM variable nozzle, applied to the device according to any one of claims 1 to 3, characterized in that: include: The control unit is used to send PWM pulse signals of different phases to the solenoid valve and pressure shock elimination device in the PWM variable nozzle, and the opening and closing actions of the solenoid valve and pressure shock elimination device in the PWM variable nozzle are controlled according to the PWM pulse signals.

5. The method for eliminating pressure shock of a PWM variable nozzle according to claim 4, characterized in that: The control signals received by the solenoid valve and the pressure shock elimination device are out of phase.

6. The method for eliminating pressure shock of a PWM variable nozzle according to claim 4, characterized in that: The control process of the PWM pulse signal is as follows: when the control signal received by the solenoid valve is high, the control signal received by the pressure shock elimination device is low; the high level is used to control the device to turn on; the low level is used to control the device to turn off.

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