CN110833064B

CN110833064B - Unmanned operation equipment and pressure spraying device and pressure balancing method thereof

Info

Publication number: CN110833064B
Application number: CN201810937021.4A
Authority: CN
Inventors: 梁宇恒
Original assignee: Guangzhou Xaircraft Technology Co Ltd
Current assignee: Guangzhou Xaircraft Technology Co Ltd
Priority date: 2018-08-16
Filing date: 2018-08-16
Publication date: 2025-02-28
Anticipated expiration: 2038-08-16
Also published as: CN110833064A

Abstract

The present invention provides an unmanned operation equipment and a pressure spraying device thereof, and a pressure balancing method implemented by the pressure spraying device. The nozzle assembly of the pressure spraying device includes an axially connected liquid storage cavity, a nozzle and a switch valve; the liquid storage cavity includes a liquid inlet and a liquid outlet for liquid to flow in; the nozzle has a connected input port and a spray port, the nozzle is fixed to the liquid storage cavity and connects the input port with the liquid outlet; the switch valve is fixed to the liquid storage cavity and can movably block the liquid outlet. The switch valve quickly blocks the liquid outlet of the liquid storage cavity, thereby realizing the rapid closure of the nozzle, which can reduce the liquid remaining in the liquid storage cavity from continuing to spray or drip from the nozzle after the pressure pump is turned off. At the same time, the liquid volume space of the liquid storage cavity can be adjusted by the up and down movement of the switch valve, thereby smoothing the pressure pulse of the pressure pump.

Description

Unmanned operation equipment, pressure spraying device and pressure balancing method thereof

Technical Field

The invention relates to the technical field of farmland pesticide spraying, in particular to a pressure spraying device, unmanned operation equipment adopting the spraying device and a pressure balancing method implemented by the pressure spraying device.

Background

At present, unmanned aerial vehicle of plant protection operation can realize the automation of liquid and spray, improves the operating efficiency greatly, reduces the harm of pesticide to the human body. However, the existing spray heads applied to unmanned aerial vehicles have the defects that when a pressure pump stops working, liquid and residual pressure are stored in a pipeline, the spray heads still spray for a period of time, and the spray heads cannot stop spraying in time, so that phenomena of multi-spraying, heavy spraying and the like exist in high-speed flight of the unmanned aerial vehicle, on one hand, uneven spraying is caused, waste is caused, and on the other hand, the multi-spraying liquid can cause damage to crops due to high concentration.

Disclosure of Invention

The invention aims to provide a pressure spraying device, unmanned operation equipment adopting the pressure spraying device and a pressure balancing method implemented by the pressure spraying device, which overcome the technical problems.

In order to achieve the above object, the present invention provides the following technical solutions:

The pressure spraying device comprises a liquid storage cavity, a nozzle and a switch valve, wherein the liquid storage cavity comprises a liquid inlet and a liquid outlet for flowing liquid, the nozzle is provided with an input port and an ejection port which are communicated, the nozzle is fixed in the liquid storage cavity and enables the input port to be communicated with the liquid outlet, the switch valve is fixedly connected with the liquid storage cavity, and the switch valve can movably block the liquid outlet.

Preferably, the switch valve comprises a driver and a rubber plug which is connected with the driver and can be driven by the driver to block the liquid outlet.

Preferably, the liquid storage cavity, the nozzle and the switch valve are coaxially connected, and the driver and the nozzle are respectively fixed at two axial ends of the liquid storage cavity.

Preferably, the driver is provided with a protective shell around the output end, a plurality of sealing rings are arranged in the protective shell at intervals, and the sealing rings are sleeved at the output end.

Preferably, a pressure sensor is arranged at one end of the switch valve facing the liquid storage cavity, and the pressure sensor is used for detecting the pressure of the liquid in the liquid storage cavity.

Preferably, sealing rings are respectively arranged at the joints between the liquid storage cavity and the nozzle and between the liquid storage cavity and the switch valve.

Preferably, an anti-impact buffer is arranged at one end of the switch valve facing the liquid storage cavity and used for smoothing pressure impact in the liquid storage cavity when the spray head component is closed quickly.

The anti-impact buffer comprises a first diaphragm, the first diaphragm covers the ventilation structure and can deform when the pressure in the liquid storage cavity is overlarge, and the ventilation structure is used for exhausting gas displaced by deformation.

Further, the spraying device further comprises a medicine box, a pressure pump, a flowmeter, a conduit and a controller, wherein the medicine box, the pressure pump, the flowmeter and the conduit are sequentially arranged, the controller is electrically connected with the pressure pump flowmeter and the switch valve, and the conduit is connected to the liquid inlet.

Further, the spraying device further comprises a pressure adjusting buffer which is arranged between the pressure pump and the liquid inlet and communicated with the pressure pump and the liquid inlet.

The pressure regulating buffer comprises a shell, a second diaphragm, a compression spring, a regulator and a cover body, wherein two ends of the shell are respectively communicated with the flowmeter and the pressure pump, a partition plate for dividing an inner cavity of the shell into two parts is arranged in the shell, openings are formed in two sides of the partition plate on one side of the shell, the second diaphragm is attached to the openings, the cover body covers the second diaphragm, the regulator penetrates through the cover body and can move along a direction approaching or separating from the shell relative to the cover body, and the compression spring is sprung between the second diaphragm and the regulator and enables the second diaphragm to retract towards the regulator when pipeline pressure is larger than the elasticity of the compression spring.

Further, a buffer pipeline communicated with the liquid inlet and the guide pipe is further arranged between the liquid inlet and the guide pipe, and the buffer pipeline is made of a flexible pipe with elasticity.

Preferably, the spray heads are provided with a plurality of spray heads, and the liquid inlet of each spray head is communicated with the guide pipe through the buffer pipeline.

As a second aspect, the invention also relates to an unmanned aerial vehicle comprising a pressure spraying device as described above.

The invention further relates to a pressure balancing method implemented by the pressure spraying device, which comprises the steps of detecting the pressure of liquid in the liquid storage cavity, adjusting the occupancy rate of the liquid to the space in the liquid storage cavity according to the pressure detection result, wherein when the pressure is lower than a preset value, the switch valve is driven to move towards the direction close to the liquid outlet, and when the pressure is higher than the preset value, the switch valve is driven to move towards the direction far away from the liquid outlet.

Compared with the prior art, the scheme of the invention has the following advantages:

1. according to the pressure spraying device, the liquid passage between the liquid storage cavity and the nozzle is quickly blocked by arranging the switch valve (particularly, the liquid outlet is blocked by the rubber plug), so that the situation that other parts of the spraying device stop working and the nozzle still sprays or drops liquid outwards is reduced to a certain extent. When the pressure sensor is arranged to detect the pressure of the liquid storage cavity, the valve is opened when the pressure reaches a set value, so that the intelligent switch of the spray head assembly is realized.

2. When the pressure is low, the rubber plug is driven to move towards the direction close to the liquid outlet, the occupancy rate of liquid to the space in the cavity is reduced, the pressure is increased, and therefore liquid pressure pulses (such as a diaphragm pump) generated by a pump in the liquid storage cavity can be smoothed to a certain extent, and atomization of the spray head assembly is more stable.

Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Drawings

The foregoing and/or additional aspects and advantages of the invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:

FIG. 1 is a schematic view of a pressure spraying apparatus according to an embodiment of the present invention;

FIG. 2 is an exploded view of the pressure sprinkler shown in FIG. 1;

FIG. 3 is a schematic view of a pressure spraying apparatus according to another embodiment of the present invention;

Fig. 4 is a schematic structural view of the pressure regulating damper shown in fig. 3, in which arrows indicate the flow direction of the liquid.

Detailed Description

Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.

Fig. 1 to 4 show a pressure spraying apparatus 1000 according to a preferred embodiment of the present invention, which includes a water tank 200, a pressure pump 300, a flow meter 400, a conduit 600, a spray head assembly 100, and a controller 900 electrically connected to the pressure pump 300, the flow meter 400, and the spray head assembly 100, which are sequentially disposed in a liquid flow direction. The controller 900 closes the nozzle 30 of the spray head assembly 100 to stop spraying the liquid outward when the pressure of the spray head assembly 100 is low, and opens the nozzle 30 to spray the liquid, such as the liquid medicine, outward when the liquid is sufficient. The flow meter 400 is used for detecting the flow rate and the flow velocity of the pressure pump 300.

Preferably, the spray head assembly 100 includes a liquid storage chamber 20, a spray nozzle 30, and an on-off valve 10 that are axially connected. The switch valve 10 is in threaded connection with the liquid storage cavity 20, the nozzle 30 is in snap connection with the liquid storage cavity 20, and the switch valve 10 and the nozzle 30 are respectively arranged at two axial ends of the liquid storage cavity 20.

The liquid storage cavity 20 comprises a liquid inlet 21 and a liquid outlet 22, the liquid inlet 21 is formed in the upper portion of the liquid storage cavity 20, and the liquid outlet 22 is formed in the center of the bottom of the cavity. The liquid inlet 21 is communicated with the conduit for pumping liquid from the medicine box by a pressure pump, the liquid flows into the liquid storage cavity 20 through the liquid inlet 21, and the liquid outlet 22 is preferably in an inverted cone shape.

The nozzle 30 has an inlet 31 and an outlet 32, which are connected, the inlet 31 being connected to the outlet 22 near the outlet 22, and the outlet 32 being arranged to spray the liquid entering the nozzle 30 through the inlet 31.

In another embodiment, the bottom end of the liquid storage cavity is not provided with a bottom plate, and the nozzle is sleeved at the bottom end of the liquid storage cavity, so that the upper part of the nozzle forms the bottom of the liquid storage cavity.

Referring to fig. 3, the switch valve 10 includes a driver 11 and a rubber plug 111 connected to an output end of the driver 11, where the driver 11 is electrically connected to the controller 900, and can drive the rubber plug 111 to perform linear movement to open and close the liquid outlet 22 of the liquid storage cavity 20 according to an instruction of the controller 900. Preferably, the driver is a linear motor with a driving rod (i.e. an output end), and the rubber plug 111 is connected to the end of the driving rod of the linear motor and can be driven by the motor to move linearly, so as to block the liquid outlet 22 or open the liquid outlet 22. Preferably, the cross section of the rubber plug 111 is elliptical, and the length of the long axis is larger than the caliber of the liquid outlet 22.

Therefore, when the spray head assembly needs to be closed, a signal is output to the linear motor through the controller, the driving rod of the linear motor extends to block the rubber plug 111 at the liquid outlet 22, a channel between the liquid outlet 22 and the input port 31 is closed, liquid is reduced or prevented from continuously flowing into the spray nozzle 30 from the liquid storage cavity 20, the switching function of the spray head assembly is realized, and accordingly liquid remaining in the liquid storage cavity 20 can be reduced from continuously spraying or dripping outwards from the spray nozzle 30. When the spray head assembly needs to be opened, the output shaft of the linear motor is driven to retract, so that the rubber plug 111 can be separated from the liquid outlet 22, and a channel between the liquid outlet 22 and the input port 31 is opened.

Preferably, a pressure sensor 40 is fixed at an end of the switch valve 10 facing the liquid storage cavity 20, and the pressure sensor 40 is electrically connected to the controller, so as to detect the pressure of the liquid in the liquid storage cavity 20, so that the controller 900 can switch the spray head assembly 100 according to the pressure in the liquid storage cavity 20, for example, the spray nozzle 30 is closed when the pressure is low, and the spray nozzle 30 is opened when the pressure is sufficient. In addition, when the nozzle 30 is opened, the driver 11 drives the rubber plug 111 to retract when the pressure sensor 40 detects a high-pressure pulse (i.e., the pressure exceeds a predetermined range) so as to increase the occupancy rate of the liquid in the liquid storage cavity 20 to the cavity space, and smooth the pressure pulse, and drives the rubber plug 111 to move downwards when the pressure sensor detects a low-pressure pulse (i.e., the pressure pump pumps out the pressure fluctuation and the pressure is lower than the predetermined range), so as to reduce the occupancy rate of the liquid in the liquid storage cavity 20 to the cavity space and actively increase the pressure.

Preferably, the outer circumference of the driving rod of the linear motor is surrounded by a protecting shell, and a plurality of rings of sealing rings 12 are arranged between the protecting shell and the driving rod and used for preventing liquid from entering the inside of the driver 11 along the driving rod to erode key parts of the driver.

Preferably, a sealing ring is provided near the junction of the liquid storage cavity 20 with the switch valve 10 and the nozzle 30 to prevent liquid from seeping out from the junction.

In this embodiment, the nozzle 30 is connected to the liquid storage cavity 20 by a snap, so that the nozzle 30 and the liquid storage cavity 20 can be conveniently assembled and disassembled, and replaced, for example, the nozzle 30 with different sizes and/or forms can be replaced as required. In other embodiments, the two may be secured by threaded connection. The switch valve 10 may also be connected to the liquid storage cavity 20 by a snap connection.

Preferably, the end of the switch valve 10 facing the liquid storage cavity 20 is further provided with an anti-impact buffer 50, which is preferably an elastic buffer, for example, a first membrane made of elastic material such as rubber, for reducing the impact of the liquid pressure in the pipeline when the driver drives the rubber plug 111 to rapidly close the nozzle 30.

Further, the switch valve 10 has a ventilation structure in communication with the liquid storage cavity 20 and the outside of the spray head assembly 100, and the first membrane covers an end of the ventilation structure facing the liquid storage cavity, and can be deformed under pressure to be placed in the ventilation structure when the pressure is higher than a preset range, and the ventilation structure is used for discharging the gas displaced by the deformation, so as to smooth the pressure in the liquid storage cavity and/or the pipeline when the spray nozzle 30 is closed rapidly. The first diaphragm gradually returns to its original shape when the pressure is reduced and gradually returns to its normal range.

With reference to fig. 4, further, the liquid inlet 21 is in communication with the conduit 600 via a section of elastic buffer pipeline 500, so as to further buffer the pressure pulse at the closing moment of the nozzle 30, specifically, when the nozzle is closed rapidly, the pipeline pressure is increased instantaneously, so that the elastic buffer pipeline 500 is elastically deformed, and based on this, the impact of the nozzle closing moment pressure on the pipeline can be reduced by the elastic deformation of the buffer pipeline.

Further, the pressure spraying device 1000 is provided with a plurality of the spray head assemblies 100, and each spray head assembly 100 is in communication with the guide pipe 600 through the buffer pipe 500.

Further, a pressure regulating buffer 700 is provided between the main line, specifically the pressure pump and the flow meter, to smooth out the line pressure when the pulse of the pressure pump 300 is large and the showerhead assembly 100 is insufficient to smooth out the line pressure pulse. The pressure regulating damper 700 communicates with both the pressure pump 300 and the flow meter 400. In other embodiments, the pressure adjusting buffer 700 may be disposed at other positions between the pressure pump 300 and the liquid inlet 21. Or the pressure regulating buffer 700 may not be provided when the head assembly sufficiently flattens the pulse pressure of the pressure pump.

Preferably, the pressure adjusting damper 700 includes a housing 701, a cover 703 fixed to the housing 701, a second diaphragm 704 disposed between the housing 701 and the cover 703, a regulator 705 penetrating the cover 703, and a compression spring 706 elastically pressed between the second diaphragm 704 and the regulator 705. The adjuster 705 is movable relative to the cover 703 in a direction approaching or separating from the housing 701, for adjusting the deformation of the compression spring 706, thereby controlling the spring force of the spring.

The two ends of the housing 701 are respectively connected to the flowmeter 400 and the pressure pump 300, a partition 702 is provided in the housing 701 to divide the inner cavity of the housing 701 into two, and openings (not numbered, the same applies below) are provided on two sides of the partition 702 on one side of the housing 701.

The second diaphragm 704 fits into the opening and is retractable toward the regulator 705 when the line pressure is greater than the force of the compression spring 706, thereby resiliently opening or closing the opening in the housing 701 by the second diaphragm 704 in response to the line pressure. When the line pressure is low (the pressure is less than the elastic force), the second diaphragm 704 is attached to the housing 701 by the elastic force of the compression spring 706, closing the line, and when the line pressure is high (the pressure is greater than the elastic force), the pressure of the liquid retracts the diaphragm 704 toward the regulator 705, opening the line. In the pipe line conducting state, the pressure pulse of the pressure pump is smoothed by the elastic deformation of the spring, so that the liquid pressure passing through the pressure regulating buffer 700 is stabilized and smoothed.

As a second aspect, the present invention also relates to an unmanned operation device (not shown), such as a plant protection unmanned plane, which has the pressure spraying device 100, and can quickly close the spray head assembly when the pressure pump is turned off, reduce the continuous spraying or dripping of the liquid remaining in the liquid storage cavity, and ensure the spraying operation effect.

As a third aspect, the invention also relates to a pressure balancing method implemented by the above-mentioned pressure spraying device. Mainly comprises the following steps:

and detecting the pressure of the liquid in the liquid storage cavity through a pressure sensor, and sending the detection result to the controller.

The controller 900 drives the rubber plug to move according to the result of the pressure detection, and adjusts the occupancy rate of the liquid in the liquid storage cavity 20 to the cavity space, thereby adjusting the pressure of the liquid.

When a low-pressure pulse is detected, that is, the pressure is lower than a preset value, the driver drives the rubber plug to move downwards (that is, to move towards the direction close to the liquid outlet), the occupancy rate of liquid in the liquid storage cavity 20 to the cavity space is reduced, the pressure is actively increased, and when a high-pressure pulse is detected, that is, the pressure is higher than the preset value, the driver drives the rubber plug to move upwards, the occupancy rate of liquid to the cavity space of the liquid storage cavity 20 is increased, and therefore the liquid pressure is reduced, and therefore the pressure of the liquid in the liquid storage cavity 20 is kept as stable as possible.

The foregoing is only a partial embodiment of the present invention, and it should be noted that it will be apparent to those skilled in the art that modifications and adaptations can be made without departing from the principles of the present invention, and such modifications and adaptations are intended to be comprehended within the scope of the present invention.

Claims

1. A pressure spraying device, comprising a spray head assembly, characterized in that the spray head assembly comprises: a liquid storage cavity, a nozzle and a switch valve; the pressure spraying device also comprises a controller electrically connected to the spray head assembly;

The liquid storage cavity comprises a liquid inlet and a liquid outlet for liquid to flow in;

The nozzle has an input port and a discharge port that are connected to each other, and the nozzle is fixed to the liquid storage cavity so that the input port is connected to the liquid discharge port;

The switch valve is fixedly connected to the liquid storage cavity, and the switch valve can movably block the liquid outlet; the switch valve includes a driver and a rubber plug connected to the output end of the driver, and the driver is connected to the controller to drive the rubber plug to move according to the instruction of the controller to open and close the liquid outlet of the liquid storage cavity;

A pressure sensor is provided at one end of the switch valve facing the liquid storage cavity, and the pressure sensor is used to detect the pressure of the liquid in the liquid storage cavity. The controller controls the switch of the nozzle assembly according to the pressure in the liquid storage cavity.

2. The pressure spraying device according to claim 1, characterized in that when the pressure sensor detects a high-pressure pulse, the driver drives the rubber plug to retract, thereby increasing the occupancy rate of the liquid in the liquid storage cavity to the cavity space;

When the pressure sensor detects a low-pressure pulse, the driver drives the rubber plug to move downward, thereby reducing the occupancy rate of the cavity space of the liquid in the liquid storage cavity.

3. The pressure spraying device according to claim 2 is characterized in that the liquid storage cavity, the nozzle and the switch valve are coaxially connected, and the driver and the nozzle are respectively fixed at two ends of the axial direction of the liquid storage cavity.

4. The pressure spraying device according to claim 3, characterized in that the driver is provided with a protective shell around its output end, a sealing ring is provided inside the protective shell, and the sealing ring is sleeved on the output end.

5. The pressure spraying device according to claim 3, characterized in that an anti-impact buffer is provided at one end of the switch valve facing the liquid storage cavity, which is used to smooth the pressure impact in the liquid storage cavity when the spray head assembly is quickly closed.

6. The pressure spraying device according to claim 5, characterized in that the switch valve is provided with a ventilation structure communicating with the liquid storage cavity and the outside of the spray head assembly;

The anti-impact buffer includes a first diaphragm, which covers the ventilation structure and can be deformed when the pressure in the liquid storage cavity is too high. The ventilation structure is used to discharge the gas displaced by the deformation.

7. The pressure spraying device according to claim 3, characterized in that sealing rings are provided near the connection between the liquid storage cavity and the nozzle and the switch valve.

8. The pressure spraying device according to any one of claims 1 to 7 is characterized in that it also includes a medicine box, a pressure pump, a flow meter, a conduit, and a controller electrically connected to the pressure pump, the flow meter and the switch valve respectively, and the conduit is connected to the liquid inlet.

9. The pressure spraying device according to claim 8, characterized in that it also includes a pressure regulating buffer disposed between the pressure pump and the liquid inlet and communicating with the two.

10. The pressure spraying device according to claim 9, characterized in that the pressure regulating buffer comprises a housing, a second diaphragm, a compression spring, a regulator and a cover;

The two ends of the shell are respectively connected to the flow meter and the pressure pump, a partition is provided in the shell to divide the inner cavity into two, and one side of the shell is provided with openings on both sides of the partition;

The second diaphragm is attached to the opening, the cover body is covered on the second diaphragm, the regulator is passed through the cover body and can move relative to the cover body in a direction close to or away from the shell, the compression spring is pressed between the second diaphragm and the regulator, and the second diaphragm is retracted toward the regulator when the pipeline pressure is greater than the elastic force of the compression spring.

11. The pressure spraying device according to claim 8, characterized in that the liquid inlet of the spray head assembly is connected to the conduit through an elastic buffer pipeline.

12. An unmanned operation equipment, characterized by comprising the pressure spraying device according to any one of claims 1 to 11.

13. A pressure balancing method implemented by the pressure spraying device according to any one of claims 1 to 11, characterized in that it comprises the following steps:

Detecting the pressure of the liquid in the liquid storage chamber;

The occupancy rate of the liquid in the space of the liquid storage chamber is adjusted according to the pressure detection result, wherein when the pressure is lower than a predetermined value, the switch valve is driven to move toward the liquid outlet; when the pressure is higher than the predetermined value, the switch valve is driven to move away from the liquid outlet.