CN214247594U

CN214247594U - Plunger pump, plant protection unmanned aerial vehicle and spraying apparatus

Info

Publication number: CN214247594U
Application number: CN202022578340.6U
Authority: CN
Inventors: 舒展; 周乐; 高俊彰
Original assignee: SZ DJI Technology Co Ltd
Current assignee: SZ DJI Technology Co Ltd
Priority date: 2020-11-09
Filing date: 2020-11-09
Publication date: 2021-09-21
Anticipated expiration: 2030-11-09

Abstract

The application provides a plunger pump, plant protection unmanned aerial vehicle and spraying apparatus. The plunger pump includes: the plunger cavity is provided with a liquid inlet and a liquid outlet; the plunger structure is at least partially accommodated in the plunger cavity, can reciprocate in the plunger cavity, sucks liquid from the liquid inlet and extrudes the liquid from the liquid outlet; a seal in sealing engagement with the plunger structure. The sealing member includes: an annular body portion having first and second sides in an axial direction, and inner and outer sides in a radial direction; a first sealing portion extending from a first side surface of the annular body portion in a direction away from the first side, the first sealing portion being disposed adjacent to an inner side of the annular body portion; a second sealing portion extending from the first side surface of the annular body portion in a direction away from the first side, the second sealing portion being disposed adjacent to an outer side of the annular body portion; the first sealing part and the second sealing part are arranged at intervals to form a notch on the first side of the annular body part, and are configured in an asymmetric structure, so that the sealing effect and the wear resistance can be improved.

Description

Plunger pump, plant protection unmanned aerial vehicle and spraying apparatus

Technical Field

The application relates to the technical field of unmanned aerial vehicles, especially, relate to a plunger pump, plant protection unmanned aerial vehicle and spraying apparatus.

Background

Along with plant protection unmanned aerial vehicle's popularization gradually, also more and more to large-traffic demand of spraying. The volume and the weight of a conventional large-flow diaphragm pump or peristaltic pump for the plant protection unmanned aerial vehicle are large. In addition, because reasons such as flying speed changes, plant protection unmanned aerial vehicle has the demand that the variable sprayed, and conventional diaphragm pump or peristaltic pump pressure is not enough, can not satisfy and spray the requirement.

SUMMERY OF THE UTILITY MODEL

The application provides a plunger pump, plant protection unmanned aerial vehicle and spraying apparatus.

In a first aspect, there is provided a plunger pump comprising:

the plunger cavity is provided with a liquid inlet and a liquid outlet;

a plunger structure at least partially received within the plunger cavity and reciprocally movable within the plunger cavity to draw liquid from the liquid inlet and express the liquid from the liquid outlet; and

a seal in sealing engagement with the plunger structure, the seal comprising:

an annular body portion having first and second sides in an axial direction, and inner and outer sides in a radial direction;

a first sealing portion extending from a first side surface of the annular body portion in a direction away from the first side and disposed adjacent an inner side of the annular body portion;

a second seal portion extending from a first side surface of the annular body portion in a direction away from the first side and disposed adjacent an outer side of the annular body portion;

wherein the first and second sealing portions are spaced apart to form a recess in the first side of the annular body portion, and the first and second sealing portions are configured in an asymmetrical configuration.

In a first aspect, a plant protection unmanned aerial vehicle is provided, comprising a fuselage and at least one plunger pump as in the first aspect embodiment, the at least one plunger pump is installed in the fuselage.

In a third aspect, there is provided a plunger pump comprising:

the plunger cavity is provided with a liquid inlet and a liquid outlet;

two sealing elements which are arranged at the middle position of the plunger cavity and are oppositely arranged at intervals, the plunger structure is in sealing fit with the two sealing elements so as to prevent the liquid from flowing out from a gap between the sealing elements and the inner wall of the plunger cavity or/and the plunger structure,

wherein the plunger cavity is provided with an overflow aperture between the two seals through which the liquid flowing between the two seals can flow out.

In a fourth aspect, there is provided a plant protection unmanned aerial vehicle comprising a fuselage and at least one plunger pump as described in the third aspect, the at least one plunger pump is mounted to the fuselage.

In a fifth aspect, there is provided a plunger pump comprising:

the transmission cavity is provided with a lubricant;

the transmission structure is accommodated in the cavity of the transmission cavity;

a plunger cavity in communication with the drive cavity;

a plunger structure at least partially received within the plunger cavity;

the power device drives the plunger structure to reciprocate through the transmission structure; and

a magnetic component mechanically coupled to the drive cavity,

wherein the magnetic component is capable of adsorbing solid particles in the lubricant.

The sixth aspect provides a plant protection unmanned aerial vehicle, including the fuselage and as in the fifth aspect at least one plunger pump, at least one plunger pump install in the fuselage.

In a seventh aspect, there is provided a spraying apparatus comprising a body and at least one plunger pump as described in the first, third and fifth aspects, the at least one plunger pump being mounted to the body.

This application configures into asymmetric structure through first sealing and the second sealing with the sealed complex sealing member of plunger structure, can improve the sealed effect and the wearability of sealing member, prevents that the liquid in the plunger structure from leaking.

Drawings

Fig. 1 is a schematic perspective view of a plunger pump according to an embodiment of the present application.

Fig. 2a and 2b are schematic cross-sectional views of a plunger pump in an embodiment of the present application.

Fig. 3 is an exploded view of a plunger pump according to an embodiment of the present application, shown with the pump body structure removed.

Fig. 4 is a partial cross-sectional schematic view of fig. 3.

Fig. 5 is a schematic diagram of the connection of the plunger pump and the flow meter in an embodiment of the present application.

Fig. 6 is a schematic partial exploded view of a plunger pump in an embodiment of the present application.

Fig. 7 is an exploded view of a pump body assembly of the plunger pump in an embodiment of the present application.

Fig. 8 is a partially sectional exploded view schematically illustrating a pump body structure of a plunger pump according to an embodiment of the present application.

Fig. 9a to 9c are cross-sectional views, not in section, of the pump body structure of the plunger pump in an embodiment of the present application.

Fig. 10 is a schematic perspective view of a plunger pump in another embodiment of the present application.

Fig. 11 is a schematic cross-sectional view of a plunger pump in another embodiment of the present application.

Fig. 12 is a partially enlarged schematic view of fig. 11.

Fig. 13 is a schematic cross-sectional view of a seal of a plunger pump in another embodiment of the present application.

Fig. 14 and 15 are schematic partial exploded views of a plunger pump in an embodiment of the present application from two different perspectives.

Fig. 16a is a schematic cross-sectional view of a plunger pump in another embodiment of the present application showing magnetic components.

Fig. 16b to 16d are schematic structural views of a plunger pump with an overpressure protection structure in another embodiment of the present application.

Fig. 17 and 18 are schematic structural views of an overpressure protection structure of a plunger pump in another embodiment of the present application.

Fig. 19 is a flow chart of a method of overpressure protection for a plunger pump in an embodiment of the present application.

Fig. 20 and 21 are detailed flowcharts of the overpressure protection method of the plunger pump in an embodiment of the present application.

Fig. 22 and 23 are flowcharts of a spray control method in an embodiment of the present application.

Fig. 24 to 29 are detailed flowcharts of a spray control method in an embodiment of the present application.

Fig. 30 is a perspective view of a plant protection unmanned aerial vehicle in an embodiment of the present application.

Detailed Description

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in this application and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

It is to be understood that although the terms first, second, third, etc. may be used herein to describe various information, such information should not be limited to these terms. These terms are only used to distinguish one type of information from another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the present application. The word "if" as used herein may be interpreted as "at … …" or "when … …" or "in response to a determination", depending on the context.

The application provides a plunger pump, an overpressure protection method, a spraying control method, a plant protection unmanned aerial vehicle and spraying equipment. The plunger pump, the overpressure protection method, the spraying control method, the plant protection unmanned aerial vehicle and the spraying equipment are described in detail below with reference to the attached drawings. The features of the following examples and embodiments may be combined with each other without conflict.

The embodiment of the application provides a plunger pump 100, can be used to needs such as agricultural plant protection unmanned aerial vehicle, pesticide spray truck, manpower sprinkler, car washer, doser and spray liquid's device and equipment. Use plant protection unmanned aerial vehicle as an example, along with plant protection unmanned aerial vehicle's gradual popularization, it is also more and more to large-traffic demand of spraying. The volume and the weight of a conventional large-flow diaphragm pump or peristaltic pump for the plant protection unmanned aerial vehicle are large. In addition, because reasons such as flying speed changes, plant protection unmanned aerial vehicle has the demand that the variable sprayed, and conventional diaphragm pump or peristaltic pump pressure is limited, can not satisfy and spray the requirement. The plunger pump 100 provided by the embodiment of the application can reach higher pressure, and can meet the spraying requirements of large flow and variable flow. In addition, plunger pump 100's light compactness of structure, the space that occupies is little, can reduce unmanned aerial vehicle's whole weight.

Referring to fig. 1 to 4, the plunger pump 100 includes a power unit 10, a transmission 20, and a pump body assembly 30, and the transmission 20 is connected between the pump body assembly 30 and the power unit 10. The pump body assembly 30 includes a pump body structure 31 and a plunger structure 32 disposed at least partially within the pump body structure 31. The transmission device 20 includes a transmission structure, which is connected to the power device 10 and the plunger structure 32, and when the power device 10 generates power, the power device 10 drives the transmission structure to rotate. The pump body structure 31 is provided with an inlet 311 and an outlet 312, and the plunger structure 32 and the pump body structure 31 constitute a sealed pump chamber. In the embodiment shown in fig. 2a and 2b, the power device 10 drives the transmission structure to rotate, and when the transmission structure rotates, the plunger structure 32 is pushed to reciprocate at least partially in the pump body structure 31 to increase or decrease the pressure of the liquid in the pump body structure 31, so that the plunger pump 100 sucks the liquid from the liquid inlet 311 and extrudes the liquid from the liquid outlet 312.

In one embodiment, the power device 10 includes a motor housing 11, a motor 12, an electric adjusting plate 13, and a motor base 14, wherein an opening is formed in the top of the motor housing 11, the motor base 14 is connected to the opening of the motor housing 11, and the motor 12 is installed on the motor base 14. The electric adjusting plate 13 is electrically connected with the motor 12 and used for controlling the motor 12 to generate power. The motor 12 includes a rotating shaft 121, and the rotating shaft 121 penetrates through the motor base 14 and the transmission device 20 and partially extends into the transmission device 20 to be connected with the transmission structure. The motor 12 is used for providing power to drive the rotating shaft 121 to rotate, so that the rotating shaft 121 drives the transmission structure to rotate.

An accommodating cavity 111 is formed between the motor base 14 and the bottom wall of the motor casing 11, and the electric tuning board 13 can be accommodated in the accommodating cavity 111. Optionally, the electrical tuning plate 13 is located between the motor 12 and the motor base 14 and protrudes from the motor 12. The motor case 11 includes a main body portion for housing the motor 12 and a sub-body portion for housing a portion of the electrical adjustment plate 13 protruding from the motor 12. The electric adjusting plate 13 is integrated inside the motor 12, so that on one hand, devices such as a temperature sensor and a hall sensor are convenient to arrange, and on the other hand, the structure of the power device 10 can be more compact.

In one embodiment, the transmission 20 may include a transmission case 22, and a transmission chamber 221 (hereinafter, explained may refer to an oil storage case) is formed in the transmission case 22. The transmission structure is disposed in the transmission cavity 221 and located on a side of the motor base 14 away from the motor 12, and the transmission structure is connected to the rotating shaft 121 of the motor 12. A gear box 22 is attached to the top of motor mount 14. The rotating shaft 121 of the motor 12 penetrates through the bottom of the transmission case 22 and partially extends into the transmission cavity 221 to be connected with the transmission structure, namely, the transmission cavity 221 is connected with the power device 10. Alternatively, in the embodiment shown in fig. 3, the transmission structure includes a swash plate 211 and a thrust bearing 212, the thrust bearing 212 is loaded on the upper surface of the swash plate 211, and the plunger structure 32 is disposed on the upper surface of the thrust bearing 212. The rotating shaft 121 of the motor 12 is inserted into the bottom of the motor base 14 and the transmission case 22 and connected to the swash plate 211, and the swash plate 211 may be provided with a connecting hole for connecting the rotating shaft 121 of the motor 12. The rotating shaft 121 of the motor 12 drives the swash plate 211 and the thrust bearing 212 to rotate, and the swash plate 211 and the thrust bearing 212 drive the plunger structure 32 to move forward in the pump body structure 31. The transmission 20 may also include a spring that urges the plunger rearward, with the swash plate and spring together driving the plunger to reciprocate.

Referring to fig. 5, the plunger pump 100 may work together with the flow meter 90, and when the plunger pump 100 works, an electromagnetic signal is generated after the motor 12 and the electric adjusting plate 13 are powered on, and the electromagnetic interference generated thereby may affect the detection accuracy of the flow meter 90. In order to prevent the above electromagnetic interference, the motor housing 11 may be a metal housing, and the motor base 14 may be a metal base. The metal motor base is fixedly connected with the metal shell and encloses a shielding space, and the motor 12 and the electric adjusting plate 13 are arranged in the shielding space. The electrical adjustment plate 13 includes a ground terminal to which a metal motor base or a metal housing is electrically connected, so as to guide an electromagnetic interference signal (i.e., interference electrons) generated by the motor 12 into the ground terminal, thereby reducing an influence of the electromagnetic interference signal generated by the plunger pump 100 on the flow meter 90. Optionally, electromagnetic shielding may be provided on the metal casing to further reduce the effect of electromagnetic interference signals generated by the plunger pump 100 on the flow meter 90.

Through the above arrangement, the motor 12 and the electric adjusting plate 13 are arranged in the shielding space formed by enclosing the metal motor base and the metal shell, and the metal motor base or the metal shell is electrically connected with the grounding end of the electric adjusting plate 13, so that the electromagnetic interference signal generated by the motor 12 is led into the grounding end, and the influence of the electromagnetic interference signal generated by the plunger pump 100 on the flow meter 90 is reduced.

In some optional embodiments, a metal bearing 15 is disposed between the metal motor base and the rotating shaft 121 to sequentially guide the electromagnetic interference signals generated on the rotating shaft 121 to the ground end of the electrical adjustment plate 13, so as to reduce the influence of the electromagnetic interference signals generated by the plunger pump 100 on the flow meter 90. Optionally, the electric machine 12 further comprises a rotor 122.

In some optional embodiments, the metal motor base is electrically connected to the metal housing, and the metal motor base is electrically connected to the ground terminal of the electrical adjustment plate 13. The metal motor base is electrically connected with the grounding end of the electric adjusting plate 13, and then the metal shell is electrically connected with the metal motor base, so that electromagnetic interference signals generated on the rotating shaft 121 of the motor 12 are sequentially conducted into the grounding end of the electric adjusting plate 13 through the metal shell and the metal motor base, and the influence of the electromagnetic interference signals generated by the plunger pump 100 on the flowmeter 90 is reduced.

Optionally, the metal motor base and the metal housing are electrically connected through a first metal screw, and the metal motor base and the ground terminal of the electrical adjustment plate 13 are electrically connected through a second metal screw 131. Electromagnetic interference signals generated by the plunger pump 100 can be sequentially guided into the ground end of the electric tuning plate 13 through the metal shell, the first metal screw, the metal motor base and the second metal screw 131.

Referring to fig. 6, in some alternative embodiments, the pump body assembly 30 further includes an electrical connection assembly, the electrical connection assembly includes a plunger pump plug 331 and a connection wire 332, the plunger pump plug 331 is inserted into a portion of the electrical adjusting plate 13 protruding from the motor 12 and is received in the sub-body portion of the motor housing 11. The connection line 332 is connected to the plunger pump plug 331, and is used for further conducting the electromagnetic interference signal on the ground terminal of the electrical tuning board 13 to the outside. Use plunger pump 100 to be applied to plant protection unmanned aerial vehicle as an example, connecting wire 332 includes connecting wire plug 333, and connecting wire plug 333 can be connected with plant protection unmanned aerial vehicle's flight control system electricity, and flight control system can include the main control board, and the main control board can be equipped with the earthing terminal, so set up and can conduct the electromagnetic interference signal that plunger pump 100 produced to the earthing terminal of the main control board of flight control system through plunger pump plug 331 and connecting wire 332 to reduce the electromagnetic interference signal that plunger pump 100 produced to flowmeter 90's influence. Optionally, plant protection unmanned aerial vehicle can also include the battery, and the battery is connected with the main control board, can further conduct the negative pole ground connection of battery with the electromagnetic interference signal that plunger pump 100 produced.

Referring to fig. 3 and 4, in some alternative embodiments, the pump body assembly 30 further includes a plunger base 34 and a plunger spring 35, and the pump body structure 31 is mounted to the plunger base 34. The plunger structure 32 is disposed through the plunger base 34 and at least partially located in the pump body structure 31, the plunger includes a plunger plug 321 and a flange 322, and the flange 322 protrudes from an edge of the plunger plug 321. A first end (a top end shown in the figure) of the plunger spring 35 abuts against the plunger base 34, and a second end (a bottom end shown in the figure) of the plunger spring 35 is sleeved outside the plunger 32 and connected with the flange 322 of the plunger 32. The plunger spring 35 can provide an elastic force to the plunger structure 32 in a direction directed toward the thrust bearing 212. Optionally, the plunger base 34 is connected to the bottom of the pump body structure 31, the pump body assembly 30 further includes a plunger cavity 310, the plunger cavity 310 is located in the pump body structure 31, and the plunger structure 32 passes through the plunger base 34 from the plunger base 34 and extends into the plunger cavity 310. The plunger base 34 is provided with a guide hole 341 therethrough along the moving direction (vertical direction in the figure) of the plunger structure 32, and the guide hole 341 corresponds to the position of the plunger cavity 310. The plunger structure 32 is disposed through the guiding hole 341 and at least partially received in the plunger cavity 310, and the plunger base 34 can provide a guiding function for the plunger structure 32. In this way, the rotating shaft 121 of the motor 12 drives the swash plate 211 and the thrust bearing 212 to rotate, and the thrust bearing 212 drives the plunger structure 32 to reciprocate in the plunger cavity 310 along the guide hole 341.

Optionally, a guide sleeve 342 is disposed at the bottom of the plunger base 34, the guide sleeve 342 corresponds to the position of the plunger cavity 310, and the plunger structure 32 is disposed through the guide sleeve 342 and can reciprocate relative to the guide sleeve 342. When the transmission structure rotates, the plunger structure 32 is pushed to pass through the guide sleeve 342 and the guide hole 341 so as to reciprocate in the pump body structure 31. The guide sleeve 342 and the guide hole 341 can guide the plunger structure 32. The guide sleeve 342 may be integrated directly into the plunger base 34, being integrally formed with the plunger base 34. In order to facilitate replacement of the plunger structure 32 after wear and reduce wear on the plunger structure 32, a groove portion is formed in an inner wall of the guide sleeve 342, a guide ring 343 is disposed in the groove portion, and the material of the guide ring 343 may be wear-resistant plastic or soft metal such as copper alloy, so as to reduce wear between the guide sleeve 342 and the plunger structure 32.

The outer diameter of the top end of the guide sleeve 342 is larger than that of the bottom end of the guide sleeve 342. It will be appreciated that the root of the guide sleeve 342 on the side closer to the plunger base 34 has a larger outer diameter for restraining the position of the plunger spring 35. The end of the guide sleeve 342 on the side away from the plunger base 34 has a smaller outer diameter, and is used for avoiding the plunger spring 35 when the plunger spring 35 reciprocates along with the plunger structure 32, so that the abrasion between the plunger spring 35 and the plunger structure is reduced.

The liquid inlet 311 of the pump body structure 31 may be connected to an external tank, which may contain liquid such as liquid medicine, and the liquid may be introduced into the pump body structure 31 through the liquid inlet 311. The outlet 312 of the pump body structure 31 may be connected to a spray head for spraying the liquid medicine. In the present embodiment, during the rotation of the thrust bearing 212 from the low point to the high point, the thrust bearing 212 can push the plunger structure 32 to move upwards in the plunger cavity 310 along the guiding hole 341 to increase the pressure of the liquid in the plunger cavity 310, so as to extrude the liquid in the pump body structure 31 out of the liquid outlet 312, and the plunger spring 35 is in a compressed state during the rotation. During the rotation of the thrust bearing 212 from the high point to the low point, the plunger spring 35 is elastically restored and provides an elastic force to the plunger structure 32 in a direction toward the thrust bearing 212, so that the plunger pump 100 sucks the liquid into the liquid inlet 311. The spraying operation is realized by the reciprocating circulation.

In some alternative embodiments, the plunger structure 32 is a hollow plunger having a hollow structure, and the hollow portion may be filled with a less dense material, thereby reducing the overall weight of the plunger pump 100. Further, the plunger structure 32 includes a plunger 321 and a flange 322 detachably connected to the bottom of the plunger 321, the flange 322 protrudes outward from the edge of the plunger 321 along the radial direction of the plunger 321, the second end of the plunger spring 35 is sleeved on the plunger 321 and connected with the flange 322, and during the upward movement of the plunger structure 32, the plunger spring 35 can be pressed by the flange 322 to make the plunger spring 35 in a compressed state. Plunger post 321 can adopt wear-resisting anticorrosive material lathe work such as wear-resisting stainless steel or pottery to obtain, and plunger post 321 can be hollow structure, and flange 322 can adopt high strength steel to process into the jump ring structure, is convenient for the joint to on plunger post 321. The plunger structure 32 is detachable, so that the amount of cutting of the plunger structure 32 can be reduced, thereby reducing the manufacturing cost.

In some alternative embodiments, an oil storage housing is provided between the plunger base 34 and the metal motor base. The plunger base 34, the metal motor base and the oil storage shell form a sealed cavity for accommodating the transmission structure. And the inside of the sealed cavity is provided with a lubricant so as to reduce the friction between the plunger structure 32 and the transmission structure and prolong the service life of the plunger structure 32 and the transmission structure. It is understood that the oil storage housing is defined by the side wall of the transmission chamber 221, and the sealed chamber is defined as an oil storage chamber. The metal motor base, the oil storage shell and the plunger base 34 form the sealed cavity. The lubricant may comprise a lubricating oil or grease that reduces wear between plunger structure 32 and swashplate 211 and plunger base 34. Optionally, a liquid guiding groove 3421 is formed at the top of the guiding sleeve 342, i.e. the side wall close to the plunger base 34, and the liquid guiding groove 3421 extends to the side wall of the guiding sleeve 342, so that the lubricant can flow from the liquid guiding groove 3421 into the space between the guiding sleeve 342 and the plunger structure 32, and infiltrate the plunger structure 32 and the guiding sleeve 342, further reducing the wear between the plunger structure 32 and the swash plate 211 and the plunger base 34.

Since the thrust bearing 212 is provided on the upper surface of the swash plate 211, the thrust bearing 212 may fall out when the swash plate 211 is inverted. To avoid this, the plunger base 34 and the reservoir housing may be removably attached by fasteners such as screws 344. The oil storage shell can be fixedly connected to the motor base 14, and can also be integrally formed with the motor base 14, so that the lubricant can be filled from the top of the oil storage shell in the filling direction. Thus, when the lubricant is required to be added, the plunger base 34 can be detached from the oil reservoir housing, and the lubricant can be directly added without turning the plunger pump 100 upside down, thereby preventing the thrust bearing 212 from falling off the swash plate 211. Alternatively, the oil storage housing is integrally formed with the motor base 14.

The electromagnetic interference of the plunger pump 100 is generated by the power-on of the motor 12 and the electric adjusting plate 13, and may be conducted to the water path by the pump body structure 31 or the plunger structure 32, and then conducted to the electrode of the flowmeter 90 through the water path, so that the signal of the flowmeter 90 fluctuates and the accuracy is affected. In order to prevent the above electromagnetic interference, in some optional embodiments, the pump body structure 31 further includes a pump body housing, the pump body housing is a metal housing, the oil storage housing is a metal housing, and the plunger base 34 is a metal base 53. Pump body shell loops through plunger base 34, oil storage casing and is connected with the metal motor cabinet electricity, in order to incite somebody to action electromagnetic interference signal transmission that produces in the liquid in pump body structure 31 extremely the metal motor cabinet is held through the ground connection that the metal motor cabinet was imported into voltage regulator plate 13 again to reduce the electromagnetic interference signal that plunger pump 100 produced and to flowmeter 90's influence.

At present, the flow channel design of the conventional plunger pump 100 is complex, and the main problems are that the plunger cavity 310 is arranged sparsely and the structure is not compact enough, resulting in a heavy weight and a large volume of the plunger pump 100. In addition, the conventional plunger pump 100 has a complicated water inlet and outlet flow path, which makes molding difficult and increases manufacturing costs.

Referring to fig. 7 and 8, the pump body structure 31 of the plunger pump 100 according to the embodiment of the present application may include:

the liquid inlet 311 is communicated with the plurality of liquid inlet cavities 313, and is used for dividing the liquid flowing in from the liquid inlet 311 into the plurality of liquid inlet cavities 313.

A plurality of liquid inlet chambers 313; the liquid inlet 311 is communicated with a plurality of liquid inlet cavities 313, and the liquid flowing from the liquid inlet 311 is divided into a plurality of liquid inlet cavities 313.

The plunger chambers 310 are communicated with the liquid inlet chambers 313 in pairs, and are used for receiving the liquid flowing out of the liquid inlet chambers 313 and increasing the pressure of the liquid entering the plunger chambers 310.

The liquid outlet chambers 314 are communicated with the plunger chambers 310 in pairs, and are used for receiving liquid pressurized by the plunger chambers 310. The liquid outlet chambers 314 are respectively arranged along the axial extension of the plunger chambers 310. In the embodiment of the present invention, the arrangement of the plurality of water outlet cavities 314 extending along the axial direction of the plurality of plunger cavities 310 means that the plurality of water outlet cavities 314 and the plurality of plunger cavities 310 extend along substantially the same direction. In the present embodiment, the shapes of the outlet chamber 314 and the plunger chamber 310 are not particularly limited, and may be a straight tube type, a serpentine type, a bent type, or the like.

In one embodiment, the plurality of outlet chambers 314 and the plurality of plunger chambers 310 are straight tubes and are parallel to each other. In another embodiment, the plurality of outlet chambers 314 and the plurality of plunger chambers 310 are cylindrical tubular structures.

And the liquid outlet 312 is communicated with the plurality of liquid outlet cavities 314, and is used for merging the liquid in the plurality of liquid outlet cavities 314 and discharging the merged liquid.

Through the above arrangement, the liquid inlet cavity 313, the plunger cavity 310 and the liquid outlet cavity 314 are communicated to form a flow passage structure of the pump body structure 31. The plurality of liquid outlet cavities 314 are respectively arranged along the axial extension of the plurality of plunger cavities 310, so that the extending directions of the liquid outlet cavities 314 and the plunger cavities 310 are the same (in the drawing, both the liquid outlet cavities and the plunger cavities are along the vertical direction), and the pump body structure 31 achieves the effect of compact structure.

In some alternative embodiments, the inlet port 311 may be provided with a water inlet fitting 315 and the outlet port 312 may be provided with a water outlet fitting 316. An outlet check valve 317 may be disposed in the outlet chamber 314 to restrict the flow of fluid from one side of the outlet chamber 314 adjacent to the plunger chamber 310 to the other side of the outlet chamber 310, but not back in the opposite direction. In one embodiment, the valve opens when the pressure in the plunger pump 100 increases, thereby draining the liquid in the liquid outlet chamber 314 through the water outlet connector 316. An inlet check valve 319 may be disposed in the inlet chamber 313 to restrict the flow of fluid from one side of the outlet chamber 314 adjacent to the plunger chamber 310 to the other side of the outlet chamber 310, but not back in the opposite direction. In one embodiment, the valve opens when the pressure within the plunger pump 100 decreases, thereby drawing liquid from the external tank into the intake chamber 313 through the intake fitting 315. It should be noted that the number of plunger structures 32 corresponds to the number of plunger cavities 310, and one plunger structure 32 is disposed in each plunger cavity 310 for changing the pressure in the plunger cavity 310. When plunger structure 32 extends into plunger cavity 310, the volume within plunger cavity 310 decreases and only outlet check valve 317 can open to pump fluid out. When the plunger structure 32 is withdrawn, the volume in the plunger chamber 310 increases and only the inlet check valve 319 can be opened to draw in liquid. Sealing strips 384 can be arranged at the connection part of the water inlet joint 315 and the liquid inlet 311 and the connection part of the water outlet joint 316 and the liquid outlet 312. In the present embodiment, the number of the plunger cavities 310 is three, and the triplex plunger pump 100 is formed. Of course, in other examples, the number of the liquid inlet cavity 313, the plunger cavity 310 and the liquid outlet cavity 314 may be set according to actual needs, so as to form other numbers of multi-cylinder plunger pumps 100.

In some optional embodiments, a plurality of the liquid inlet cavities 313 are respectively disposed along the axial extension of a plurality of the plunger cavities 310. The plurality of liquid inlet cavities 313 are respectively arranged along the axial extension of the plurality of plunger cavities 310, so that the extending directions of the liquid inlet cavities 313, the liquid outlet cavities 314 and the plunger cavities 310 are the same (all the liquid inlet cavities, the liquid outlet cavities and the plunger cavities are along the vertical direction in the drawing), and the effect of compact structure is favorably realized.

In some optional embodiments, the pump body structure 31 further includes a converging chamber 3141 disposed in a peripheral space of the outlet chamber. That is, the converging cavity is arranged on a peripheral plane where the outlet of the water outlet cavity is positioned, and a converging channel is formed on the peripheral plane. Compared with the prior art, the flow converging mode of punching the cavity wall of the water outlet cavity is simpler in process. The confluence cavity 3141 is communicated with the liquid outlets 312 and the liquid outlets 314, and is used for discharging the liquid in the liquid outlets 314 after confluence from the liquid outlets 312, so as to improve the efficiency of water discharge.

The converging cavity 3141 is provided with a water collecting port 3142, and liquid entering the converging cavity 3141 is discharged from the liquid outlet 312 through the water collecting port 3142. The water collecting port 3142 is communicated with the liquid outlet 312, and can guide the liquid in the confluence cavity 3141 to the liquid outlet 312. Optionally, in order to save the volume, the water collecting port 3142 is located between the liquid inlet cavity 313 and the adjacent liquid outlet cavity 314, and the plunger cavity 310 reasonably utilizes the gap space between the liquid inlet cavity 313 and the liquid outlet cavity 314 which are arranged in the same direction, so that no extra space is occupied, and the effect of compact structure is achieved.

In some optional embodiments, the liquid inlet cavity 313 and the plunger cavity 310 are arranged in a penetrating manner, so that the liquid inlet cavity 313 and the plunger cavity 310 are arranged in the same direction, and the effect of compact structure can be better achieved. Compared with the prior art, the shunting cavity and the plunger cavity 310 are separated, the cavity wall between the shunting cavity and the plunger cavity 310 is not required to be punched, the process is simplified, in addition, liquid from the shunting cavity can directly enter the plunger cavity 310, the pressure reduction phenomenon caused by bending of a flow channel is reduced, and the pressure of the liquid is improved. In one embodiment, the diversion chamber 313 and the plunger chamber 310 are concentrically disposed therethrough.

Optionally, the liquid inlet chamber 313 and the liquid outlet chamber 314 are arranged at intervals around a circumference, so that the effect of compact structure can be better achieved. It should be noted that, the spaced arrangement refers to the arrangement of adjacent cavities at a distance. In one embodiment, one plunger cavity 310 is arranged between every two water outlet cavities 313, so that the water check valves are far away from each other, the water check valves cannot be influenced by the water hammer effect, and the efficiency of the pump is higher. Further, the plunger cavities 310 and the liquid outlet cavities 314 are arranged at equal intervals around a circumference, so that the weight distribution of the pump body structure 31 and the flow direction distribution of liquid diversion and confluence are uniform.

In some optional embodiments, the pump body structure 31 further includes a water inlet pipe 3131, and the water inlet pipe 3131 is respectively communicated with the liquid inlet 311 and the plurality of liquid inlet cavities 313, and is used for dividing the liquid entering from the liquid inlet 311 into the plurality of liquid inlet cavities 313, so as to improve the efficiency of water inlet. Optionally, the liquid inlet cavity 313 and the liquid outlet cavity 314 are respectively arranged around the circumference of the water inlet pipe 3131 at intervals, so that the effect of compact structure can be better achieved. The diameter of the inlet tube is larger than the diameter of the distribution chamber to provide sufficient liquid for each distribution chamber and corresponding plunger chamber 310 as quickly as possible.

As can be appreciated, the water paths of the plurality of outlet chambers 314 converge to the manifold chamber 3141. The water paths of the plurality of liquid inlet cavities 313 are collected to the water inlet pipe 3131. The manifold chamber 3141 may be arranged in a direction around the circumference of the pump body structure 31. The water inlet pipe 3131 is located in the middle of a space enclosed by the plurality of liquid inlet cavities 313. In this embodiment, the central portion of the space enclosed by the liquid inlet cavities 313 is also the central portion of the pump body structure 31, and the converging cavity 3141 may be an annular cavity located at the periphery of the water inlet pipe 3131.

In some alternative embodiments, the length of the liquid outlet chamber 314 along the axial direction of the pump body structure 31 may be set to be smaller than the sum of the lengths of the liquid inlet chamber 313 and the plunger chamber 310 along the axial direction of the pump body structure 31, so as to achieve the effects of compact structure and miniaturization. Optionally, the liquid inlet 311 is disposed on a side of the liquid outlet cavity 314 away from the liquid outlet 312, so that the space of the pump body structure 31 can be reasonably utilized, and the effects of compact structure and miniaturization can be achieved.

The pump body assembly 30 may further include a pump cover 38, which is hermetically connected to the top of the pump body structure 31, and the pump cover 38 and the pump body structure 31 may be detachably connected through fasteners such as screws. The outer edge of the top surface of the pump body structure 31 may protrude upward to form a first rib 381, and the middle of the top surface of the pump body structure 31 may protrude upward to form a second rib 382. After the pump cover 38 is connected to the pump body structure 31, the first rib 381 and the pump cover 38 enclose to form the confluence chamber 3141. A diversion space formed by the enclosure between the second flange 382 and the pump cover 38 is respectively communicated with the water inlet pipe 3131 and the diversion cavity, so that the liquid entering the water inlet pipe 3131 is diverted into the plurality of diversion cavities through the diversion space. The flow dividing cavity can slow down fluid pulsation, can be used as an auxiliary water tank, and is favorable for improving the spraying control precision and the uniformity. Optionally, the top surfaces of the first barrier 381 and the second barrier 382 may be respectively provided with a groove 383, and a sealing strip may be disposed in the groove 383 to improve the sealing property between the pump cover 38 and the pump body structure 31.

Referring to fig. 9a to 9c, in some alternative embodiments, the plunger cavities 310 and the adjacent liquid outlet cavities 314 are communicated with each other in a group of two by two, so as to communicate the liquid inlet cavity 313, the plunger cavities 310 and the liquid outlet cavities 314 to form a flow passage structure of the pump body structure 31. In order to realize the mutual communication between the plunger cavity 310 and the adjacent liquid outlet cavity 314, the pump body structure 31 further includes a plurality of cavity-transferring flow passages 39 corresponding to the number of the plunger cavities 310, and one cavity-transferring flow passage 39 is provided between the plunger cavity 310 and the adjacent liquid outlet cavity 314 and is used for communicating the plunger cavity 310 and the liquid outlet cavity 314. Optionally, since the cavity-transferring flow channel 39 for communicating the plunger cavity 310 with the liquid outlet cavity 314 is difficult to machine from the inside of the pump body structure 31, the cavity-transferring flow channel 39 extends to and penetrates through the outer side wall of one of the plunger cavity 310 or the liquid outlet cavity 314, and the cavity-transferring flow channel 39 penetrates through the outer side wall of one of the plunger cavity 310 or the liquid outlet cavity 314 and is provided with a plug 391, so that the cavity-transferring flow channel 39 is convenient to machine.

Referring to fig. 10-18, in some alternative embodiments, plunger pump 100 further includes

seals

61, 62, magnetic component 40, and overpressure protection structure 50.

The

seals

61, 62 are used to prevent lubricant from leaking into the plunger cavity 310 or liquid in the pump body structure 31 from leaking into the seal cavity. Referring to fig. 12 and 13, the sealing

members

61, 62 are in sealing engagement with the plunger structure 32, and the sealing

members

61, 62 include:

an annular body portion 63, the annular body portion 63 having a first side (shown as an upper surface in fig. 13) and a second side (shown as a lower surface in fig. 13) in an axial direction, and an inner side and an outer side in a radial direction.

A first seal portion 64, the first seal portion 64 extending from a first side surface of the annular body portion 63 in a direction away from the first side and being disposed adjacent to an inner side of the annular body portion 63. The first seal 64 abuts the plunger structure 32.

A second sealing portion 65, the second sealing portion 65 extending from the first side surface of the annular body portion 63 in a direction away from the first side and being disposed adjacent to an outer side of the annular body portion 63.

Wherein the first sealing portion 64 and the second sealing portion 65 are spaced apart to form a recess 60 on a first side of the annular body portion 63, and the first sealing portion 64 and the second sealing portion 65 are configured in an asymmetrical configuration.

With the above arrangement, the first seal portion 64 and the second seal portion 65 of the

seals

61 and 62 are configured asymmetrically, and the sealing effect and the wear resistance of the

seals

61 and 62 can be improved.

In some alternative embodiments, the first seal 64 and the second seal 65 are not identical in at least one of shape and size. The first seal portion 64 and the second seal portion 65 can be subjected to different pressures, and the sealing effect and the wear resistance of the

seals

61 and 62 can be improved.

The shape and/or size of the first sealing portion 64 and the second sealing portion 65 may be different, which means that the height of the first sealing portion 64 is different from the height of the second sealing portion 65.

In the present embodiment, the height of the first sealing portion 64 is smaller than the height of the second sealing portion 65. With the arrangement, the inner rings of the sealing

elements

61 and 62 are shorter than the outer rings, so that the sealing

elements

61 and 62 can be filled with liquid to be blocked, the tensioning effect on the second sealing part 65 can be formed, the sealing

elements

61 and 62 can be subjected to tensioning force from inside to outside, and the sealing effect can be improved.

The shape and/or size of the first sealing portion 64 and the second sealing portion 65 may be different, which means that the thickness of the first sealing portion 64 is different from the thickness of the second sealing portion 65. In the present embodiment, the thickness of the first sealing portion 64 is greater than the thickness of the second sealing portion 65. With the above arrangement, the lip formed by the first seal portion 64 of the

seal

61, 62 can be understood as an inner ring lip, and the lip formed by the second seal portion 65 of the

seal

61, 62 can be understood as an outer ring lip. Wherein the inner ring lip is thicker, which can increase the wear resistance of the

seals

61, 62. The outer ring lip is thinner, which can increase the fit of the

seals

61, 62. Thereby improving the sealing effect and wear resistance of the

seals

61, 62.

In some alternative embodiments, the first sealing portion 64 includes a first sealing lip 641 and a second sealing lip 642 adjacent to the first sealing lip 641 along the axial direction of the annular body 63, and both the first sealing lip 641 and the second sealing lip 642 are disposed obliquely with respect to the axial direction of the annular body 63, and an included angle of the first sealing lip 641 with respect to the axial direction of the annular body 63 is different from an included angle of the second sealing lip 642 with respect to the axial direction of the annular body 63. With the above arrangement, the angles of the first seal lip 641 and the second seal lip 642 of the first seal portion 64 are also asymmetrical, and the sealing effect and the wear resistance of the

seals

61 and 62 can be improved. In this embodiment, the first sealing lip 641 is located on a side away from the annular body 63 in the axial direction of the annular body 63, and an included angle of the first sealing lip 641 with respect to the axial direction of the annular body 63 is larger than an included angle of the second sealing lip 642 with respect to the axial direction of the annular body 63. It will be appreciated that the first sealing lip 641 on the side away from the annular body portion 63 is the side in contact with the liquid to be blocked, and may be referred to as the liquid side. The second sealing lip 642 on the side near the annular body portion 63 is in contact with air, which may be referred to as the air side. The axial included angle of the first sealing lip 641 with respect to the annular body 63 is larger than the axial included angle of the second sealing lip 642 with respect to the annular body 63, that is, the angle of the liquid is steeper, which can improve the pressure gradient and reduce the liquid leakage. The air side angle is more gradual and the pressure gradient is relatively lower, which is beneficial to suck back the liquid film formed on the surfaces of the sealing

elements

61 and 62, thereby improving the sealing effect of the sealing

elements

61 and 62.

In some alternative embodiments, both the inner side wall and the outer side wall of the annular body 63 are disposed obliquely with respect to the axial direction of the annular body 63, and the included angle between the inner side wall of the annular body 63 and the axial direction of the annular body 63 is different from the included angle between the outer side wall of the annular body 63 and the axial direction of the annular body 63. The sealing effect and wear resistance of the

seals

61, 62 are improved. In this embodiment, an included angle of the inner side wall of the annular body portion 63 with respect to the axial direction of the annular body portion 63 is smaller than an included angle of the outer side wall of the annular body portion 63 with respect to the axial direction of the annular body portion 63. That is, the angle of the air in the annular body 63 is more gradual, and the pressure gradient is relatively lower, which is beneficial to suck back the liquid film formed on the surfaces of the sealing

elements

61 and 62, thereby improving the sealing effect of the sealing

elements

61 and 62.

In some alternative embodiments, the inner side wall of the annular body portion 63 is formed with a chamfered portion 66 on a side thereof away from the first sealing portion 64. With the above arrangement, a gentle chamfer is added on the air side of the annular body 63, which is beneficial to suck back the liquid film formed on the surfaces of the sealing

members

61 and 62, and the suck back effect can be increased. In addition, when liquid overflows from the position of the sealing

members

61 and 62, the chamfered portion 66 also functions to contain the seeping liquid and prevent the increase of back pressure.

In some alternative embodiments, the side wall of the first sealing portion 64 away from the recess 60 is formed with a multi-layer sealing lip 643 in a wave shape, which can improve the sealing effect of the sealing

members

61 and 62. Further, a multi-layer sealing lip 643 is formed on both the side of the first sealing portion 64 close to the plunger structure 32 and the side of the annular body portion 63 close to the plunger pump 100, so that the sealing effect of the sealing

members

61 and 62 can be improved. It is understood that a partial sealing lip is formed on a side of the first sealing portion 64 close to the plunger pump 100, and a partial sealing lip is formed on a side of the annular body portion 63 close to the plunger pump 100, and the partial sealing lips of the two form the multi-layer sealing lip 643 together.

In some alternative embodiments, the inner side wall of the annular body 63 is provided with a dust ring 67, which can improve the dust sealing effect of the sealing

members

61 and 62. Further, the inner side wall of the recess 60 is provided with the elastic ring 68, so that the holding force of the annular body portion 63 towards the plunger cavity 310 can be increased, and the sealing effect can be increased.

In some alternative embodiments, the

seals

61, 62 comprise at least one of rubber seals and polyurethane seals, which may improve the wear resistance of the

seals

61, 62. Alternatively, the number of the sealing

members

61 and 62 is two, the two sealing members include a first sealing member 61 (water seal) located between the plunger structure 32 and the plunger cavity 310 in the pump body structure 31 and a second sealing member 62 (oil seal) located between the plunger structure 32 and the plunger cavity 310 in the plunger base 34, and the material of the first sealing member 61 may be fluororubber with good corrosion resistance. In order to improve the wear resistance, a wear-resistant agent such as interlining can be added. The material of the second seal 62 may be nitrile rubber or polyurethane, which has excellent oil resistance and wear resistance. It is understood that in some embodiments, the number of the sealing

members

61, 62 is at least two, such as three, four, five, and the application is not limited thereto.

The

seals

61, 62 and the plunger structure 32 may wear out over time, resulting in seal failure and fluid leakage. Referring to fig. 11, 12, 14 and 15, in some alternative embodiments, in order to prevent the seeped liquid from flowing back or crossing each other due to pressure build-up, or the liquid in the pump body structure 31 of the plunger pump 100 overflows and flows into the sealing cavity below, which causes the oil to be emulsified and deteriorated, and affects the lubricant. Two sealing

members

61, 62 are disposed at a middle position of the plunger cavity 310, and the two sealing

members

61, 62 are disposed at an opposite interval, the plunger structure 32 is in sealing engagement with the two sealing

members

61, 62 to prevent the liquid from flowing out from a gap between the sealing

members

61, 62 and an inner wall of the plunger cavity 310 or/and the plunger structure 32. It will be appreciated that liquid can flow out of the gap between the

seals

61, 62 and the inner wall of the plunger cavity 310, the gap between the

seals

61, 62 and the plunger structure 32, or both. Wherein the plunger chamber 310 is provided with an overflow aperture between the two

seals

61, 62, through which the liquid flowing in between the two

seals

61, 62 can flow out.

With the above arrangement, by providing the overflow hole between the two sealing

members

61, 62, the liquid flowing between the two sealing

members

61, 62 can flow out through the overflow hole, so as to prevent the lubricant from leaking and flowing into the pump body structure or prevent the liquid in the pump body structure 31 from leaking and flowing into the sealing cavity of the transmission device 20.

In some alternative embodiments, the two sealing

members

61 and 62 divide the plunger cavity 310 into an avoiding cavity 691, an overflowing cavity 92 and a pumping cavity 693, wherein the avoiding cavity 691 and the pumping cavity 693 are respectively located at two ends of the cavity of the plunger cavity 310, and the overflowing cavity 92 is located in the middle of the cavity of the plunger cavity 310. It will be appreciated that the bypass chamber 691 is formed in the space between the recess 60 of the

seal

61, 62 and the plunger base 34, the pumping chamber 693 is formed in the space between the recess 60 of the

seal

61, 62 and the pump body structure 31, and the spill chamber 92 is formed in the space between the plunger base 34 and the pump body structure 31. Wherein the avoidance chamber 691 contains a lubricant, and the seal (i.e., the second seal 62) adjacent the avoidance chamber 691 prevents the lubricant from flowing into the overflow chamber 92. The pumping chamber 693 contains a liquid medicine, and the sealing member (i.e., the first sealing member 61) adjacent to the pumping chamber 693 is used to prevent the liquid medicine from flowing into the overflow chamber 92, so as to prevent a lubricant from leaking into the plunger chamber 310 or a liquid in the pump body structure 31 from leaking into the sealing chamber. It will be appreciated that the first seal 61 is disposed adjacent the pumping chamber 693 and the second seal 62 is disposed adjacent the bypass chamber 691.

In some optional embodiments, the plunger pump 100 further comprises a guide block 345, the guide block 345 is disposed between the first sealing element 61 and the second sealing element 62, and the plunger structure 32 is disposed through the guide block 345 and can reciprocate relative to the guide block 345. It can be understood that, the sealing between the plunger structure 32 and the pump body structure 31 is realized through the first sealing element 61, the sealing between the plunger structure 32 and the plunger base 34 is realized through the second sealing element 62, the first sealing element 61 and the second sealing element 62 are both sleeved on the plunger structure 32, the first sealing element 61 and the second sealing element 62 are mutually separated and pressed through the guide block 345, the first sealing element 61 and the second sealing element 62 can be fixed, and the guide sleeve 342 can be combined to jointly provide a guide function for the plunger structure 32, so that the plunger structure 32 becomes a simple support structure, the shaking is reduced, the sealing failure caused by the fact that the first sealing element 61 and the second sealing element 62 are not concentric with the plunger structure 32 due to the shaking is avoided, three-layer dynamic sealing is formed, and the sealing effect can be improved. Optionally, the guide block 345 comprises a plastic guide block or a soft metal guide block. That is, the material of the guide block 345 may be a soft metal such as wear-resistant plastic or copper alloy, which reduces wear between the guide block and the plunger structure 32.

The guide block 345 includes a first pressing portion 3451 and a second pressing portion 3452 connected to the first pressing portion 3451, the first pressing portion 3451 is close to the first sealing element 61, and the second pressing portion 3452 is close to the second sealing element 62, so as to fix the first sealing element 61 and the second sealing element 62. In this embodiment, the guide block 345 is a stepped structure, the first pressing portion 3451 abuts against the inner wall of the first sealing member 61 and is tightly fitted with the pump body structure 31, and the second pressing portion 3452 abuts against the outer wall of the second sealing member 62 and is tightly fitted with the plunger base 34, so that concentricity among the plunger base 34, the pump body structure 31 and the plunger structure 32 is ensured, and the sealing effect is improved.

Plunger pump 100 still includes pump body structure 31 and with plunger base 34 that pump body structure 31 is connected, the outside of guide block 345 is equipped with first step anchor ring and second step anchor ring, first step anchor ring with plunger base 34 cooperates, second step anchor ring with pump body structure 32 cooperates, in order to guarantee plunger base 34 with pump body structure 31's concentricity. Optionally, the inner annular surface of the guide block 345 cooperates with the plunger structure 32 to ensure concentricity of the plunger base 34, the pump body structure 31, and the plunger structure 32.

In some alternative embodiments, at least one of the inner wall and the outer wall of the guide block 345 is provided with a third sealing element, which can improve the sealing effect. In this embodiment, the third sealing element includes an impermeable sealing ring 3453 disposed on the inner wall of the guide block 345 and a static sealing O-ring 3454 disposed on the outer wall of the guide block 345. Optionally, the distance between the impermeable sealing ring 3453 and the first sealing element 61 and the second sealing element 62 is larger than the stroke distance of the plunger structure 32, so as to prevent oil film or water film from mutually permeating. Optionally, the outer wall of the guide block is provided with a fourth sealing element, and the diameter of the fourth sealing element is larger than that of the third sealing element. It can be understood that the inner wall of the guide block 345 is provided with an impermeable sealing ring 3453, the outer wall of the guide block 345 is provided with a static sealing O-ring 3454, and the diameter of the static sealing O-ring 3454 is larger than that of the impermeable sealing ring 3453.

In some alternative embodiments, the inner wall portion of the plunger cavity 310 located inside the pump body structure 31 is provided with a first receiving groove along the axial direction, and one of the two sealing members (i.e. the first sealing member 61) close to the pump body structure 31 is provided inside the first receiving groove. It will be appreciated that the bottom surface of the pump body structure 31 is provided with said first housing groove, in which the first seal 61 between the plunger structure 32 and the plunger cavity 310 in the pump body structure 31 is provided. The inner wall of the plunger cavity 310 in the plunger seat 34 is provided with a second receiving groove along the axial direction, and one of the two sealing members (i.e. the second sealing member 62) close to the plunger seat 34 is provided in the second receiving groove. It will be appreciated that the top end of the inner wall of the guide bore 341 of the plunger base 34 is provided with the second receiving groove in which the second seal 62 between the plunger structure 32 and the plunger cavity 310 in the plunger base 34 is provided. In this embodiment, the first pressing portion 3451 abuts against the inner wall of the first sealing member 61 and is tightly fitted with the first receiving groove of the pump body structure 31, and the second pressing portion 3452 abuts against the outer wall of the second sealing member 62 and is tightly fitted with the second receiving groove of the plunger base 34, so that the concentricity among the plunger base 34, the pump body structure 31 and the plunger structure 32 is ensured, and the sealing effect is improved.

Alternatively, the first and second receiving grooves are stepped structures, and the structures of the first and

second sealing members

61 and 62 are adapted to the stepped structures. The first sealing element 61 and the second sealing element 62 are embedded in corresponding step-shaped structures, and the step-shaped structures can limit the first sealing element 61 and the second sealing element 62. Optionally, the bottom wall of the first receiving groove is formed with a first chamfered portion 3457, and the bottom wall of the second receiving groove is formed with a second chamfered portion 3458, so as to introduce the liquid into the recess 60 of the sealing member to form a tensioning action on the second sealing portion 65 of the sealing member, so that the sealing member is subjected to a tensioning force from the inside to the outside, thereby improving the sealing effect.

For better sealing, a fourth sealing member 346 may be disposed on the rotating shaft 121 of the motor 12. Fifth sealing member 347 can be arranged between motor casing 11 and the oil storage casing, and motor casing 11, fourth sealing member 346 and fifth sealing member 347 can realize the full sealing of motor 12, and a better sealing effect is achieved.

In some alternative embodiments, the overflow holes include a first overflow hole 611 and a second overflow hole 621, and the first overflow hole 611 is provided in a space formed between one of the two sealing members near the pump body structure 31 and the guide block 345, that is, a space formed between the first sealing member 61 and the guide block 345, so that the liquid flowing into the space can flow out through the first overflow hole 611. The second overflow hole 621 is provided in a space formed between one of the two sealing members adjacent to the plunger base 34 and the guide block 345, that is, a space formed between the second sealing member 62 and the guide block 345, so that the liquid flowing into the space can flow out through the second overflow hole 621. Optionally, a first overflow aperture 611 is provided on the air side of the first seal 61. The second overflow hole 621 is provided on the air side of the second seal 62. The aperture of the first overflow hole 611 is larger than that of the second overflow hole 621. Since the amount of the lubricant oozing out is relatively small and the destructiveness thereof is relatively weak, the hole diameter of the overflow hole of the second seal 62 is set to be relatively small. Since the amount of leakage of the chemical liquid is relatively large and the corrosiveness is very high, the overflow hole of the first seal 61 is relatively large.

It will be appreciated that a portion of the plunger cavity 310 is located within the pump body structure 31 and another portion is located within the plunger base 34. The pump body structure 31 includes a bottom surface, the bottom surface is provided with an opening communicated with the plunger cavity 310, and the opening corresponds to the positions of the guide hole 341 and the guide sleeve 342 of the plunger base 34. The bottom surface is provided with an overflow channel 36 for draining liquid overflowing from the plunger cavity 310 out of the plunger cavity 310.

The overflow grooves 36 extend from the middle part of the bottom surface of the pump body structure 31 to the plunger cavities 310 respectively, so as to discharge the liquid overflowing from the plunger cavities 310 out of the plunger cavities 310, and the overflowing liquid can be collected and discharged at the middle part of the pump body structure 31. Optionally, the overflow groove 36 extends to the edge of the bottom surface of the pump body structure 31 to drain liquid overflowing the plunger cavity 310 out of the plunger cavity 310.

In this embodiment, the first sealing element 61 is provided with a first overflow hole 611 opposite to the overflow groove 36 at the notch position of the plunger cavity 310, so that the liquid overflowing from the plunger cavity 310 is discharged out of the plunger cavity 310 through the first overflow hole 611. In the present embodiment, the overflow groove 36 is located in the middle of the bottom surface of the pump body structure 31, and the first sealing member 61 is provided with a first overflow hole 611 communicating with the overflow groove 36, and the first overflow hole 611 extends to the opening and communicates with the overflow groove 36. The liquid overflowing the plunger chamber 310 can flow into the overflow groove 36 through the first overflow hole 611, and then the overflow groove 36 is discharged out of the pump body structure 31. The first seal 61 may be provided with a first spill hole 611 not communicating with the spill groove 36, and the liquid overflowing from the plunger chamber 310 may be discharged directly from the pump body structure 31 through the first spill hole 611. The provision of the overflow channel 36 in the pump structure 31 and the overflow aperture in the first seal 61 prevents liquid from flowing down and corroding the trimming plate 13, and facilitates the recovery of liquid from the pump structure 31. The side wall of the plunger base 34 is provided with a diversion trench 622, and the second overflow hole 621 is communicated with the diversion trench 622. The liquid overflowing the plunger cavity 310 can flow into the guiding groove 622 through the second overflow hole 621, and then the guiding groove 622 is discharged out of the plunger base 34. It is understood that the first overflow hole 611 and the second overflow hole 621 may be provided to discharge overflowed lubricant (e.g., lubricant oil) or liquid medicine (or water) out of the plunger pump, and thus, the arrangement of the first overflow hole 611 and the second overflow hole 621 may be changed according to the arrangement of the sealing

members

61 and 62 and the pump body structure 31, etc., and the present application is not limited thereto.

In order to achieve better overflow effect, the pump body structure 31 further includes a liquid storage tank 37 on the bottom surface, and the liquid storage tank 37 is communicated with the overflow tank 36. When a large amount of liquid overflows from the plunger chamber 310, a part of the liquid is discharged from the overflow groove 36 and the first overflow hole 611 of the first seal 61 to the outside of the pump body structure 31. Another part of the liquid can flow into the liquid storage tank 37 for temporary storage, and after the liquid in the overflow tank 36 is drained, the liquid in the liquid storage tank 37 flows back to the overflow tank 36 and then is discharged out of the pump body structure 31. Optionally, the reservoir 37 extends to the edge of the bottom surface of the pump body structure 31 to discharge the liquid overflowing from the plunger cavity 310 out of the pump body structure 31, so as to improve the overflow efficiency. The reservoir 37 may also serve a weight reduction function. In the example shown in the figures, the overflow trough 36 is shown in communication with a sump 37 and extending to the edge of the bottom surface of the pump body structure 31. In the embodiment shown in fig. 14, the liquid storage tank 37 located below the drawing is communicated with the overflow tank 36, and it is understood that two other liquid storage tanks 37 may be communicated with the overflow tank 36 (not shown in the drawing), and the present application is not limited thereto.

Since the first seal 61 is easily worn and corroded, there is a need for quick removal and replacement. The pump body structure 31 and the plunger base 34 can be detachably connected through fasteners such as screws 344, and the pump body structure 31 and the plunger base 34 can be detached from each other by detaching the fasteners, so that the first sealing member 61 can be replaced. In order to avoid lubricant leakage caused by opening the transmission case 22 when the first sealing member 61 is replaced, the fastening member connected between the oil storage housing of the transmission case 22 and the plunger base 34 may be embedded in the projection surface of the pump body structure 31, so as to achieve the purpose of preventing the transmission case 22 from being easily disassembled after the pump body structure 31 is disassembled, and the fastening member may adopt a special screw head shape to match with the connecting portion 3441 with special properties, such as an oval shape, so as to prevent the transmission case 22 from being easily disassembled.

Referring to fig. 5 and 16a, in alternative embodiments, in addition to the provision of seals to prevent fluid from entering the transmission housing 22 to cause lubrication failure, the transmission housing 22 itself may be provided with wear protection. The transmission cavity 221 is provided with a lubricant. The transmission structure is accommodated in a cavity of the transmission cavity 221. The plunger chamber 310 communicates with the transmission chamber 221. The plunger structure 32 is at least partially received within the plunger cavity 310. The power device 10 drives the plunger structure 32 to reciprocate through the transmission structure. The magnetic component 40 is mechanically coupled to the drive cavity 221. Wherein the magnetic component 40 can adsorb solid particles (such as iron filings generated by abrasion between the plunger structure and the transmission structure) in the lubricant.

Through the arrangement, the magnetic part 40 can collect scrap iron generated between the plunger structure 32 and the transmission structure due to abrasion, so that the lubricating effect is prevented from being influenced by the pollution of a lubricating substance.

In some alternative embodiments, the magnetic component 40 is disposed inside or outside the transmission cavity 221. When the magnetic component 40 is arranged outside the transmission cavity 221, the magnetic field generated by the magnetic component 40 can penetrate through the inner wall of the transmission cavity 221, so that scrap iron generated between the plunger structure 32 and the transmission structure due to abrasion is collected.

In some optional embodiments, a liquid guiding hole is formed in a side wall of the transmission cavity 221, and the magnetic component 40 is disposed in the transmission cavity 221 at a position corresponding to the liquid guiding hole. The lubricant can be replaced periodically through the drain hole. The magnetic member 40 can collect iron pieces generated by abrasion between the plunger structure 32 and the thrust bearing 212 of the transmission structure from the liquid guide hole. Further, the plunger pump 100 further includes a sealing plug 41 for sealing the liquid guiding hole, the magnetic component 40 is mechanically coupled to the sealing plug 41, and the sealing plug 41 is detachably connected to the transmission cavity 221 at the position of the liquid guiding hole, so as to implement the arrangement of the magnetic component 40 at the position of the liquid guiding hole. A sealing ring 411 may be disposed between the sealing plug 41 and the liquid guiding hole.

In some alternative embodiments, the position where the liquid guiding hole is opened in the transmission cavity 221 corresponds to the contact position of the transmission structure and the thrust bearing 212 of the plunger structure 32. In this manner, the magnetic member 40 can be disposed near the plunger structure 32 and the wear surface of the thrust bearing 212, improving the collection effect of the iron pieces.

The magnetic member 40 includes a chip suction magnet 42 and a chip storage groove 43 provided at the fluid guide hole, and the chip storage groove 43 is adjacent to the chip suction magnet 42. Iron chips generated between the plunger structure 32 and the transmission structure due to abrasion are suspended in the transmission cavity 221 and can gradually move towards the position of the liquid guide hole under the magnetic attraction of the chip suction magnet 42, so that the iron chips are collected in the chip storage groove 43 in a concentrated manner, the chip storage groove 43 is replaced and cleaned, and the next collection can be performed, so that the iron chips are prevented from polluting lubricating oil and affecting the lubricating effect.

In some alternative embodiments, the power device 10 drives the transmission structure to rotate so as to drive the plunger structure 32 to reciprocate. The magnetic component 40 is arranged along the tangential direction of the rotation direction of the transmission structure and is connected with the transmission cavity 221. The magnetic member 40 is disposed near the plunger structure 32 and the wear surface of the thrust bearing 212, and is disposed along the tangential direction in which the iron pieces are thrown out, and the collecting effect can be improved.

As described above, in some embodiments, because thrust bearing 212 is disposed on the upper surface of swash plate 211, thrust bearing 212 may fall out when swash plate 211 is inverted. To avoid this, the plunger base 34 and the oil storage housing may be detachably connected by fasteners such as screws 344. The oil storage shell can be fixedly connected to the motor base 14, and can also be integrally formed with the motor base 14. In other embodiments, due to the arrangement of the liquid guiding hole, the oil storage housing (transmission cavity 221) may be fixedly connected to the motor base 14, fixedly connected to the pump body structure 31 or the plunger base 34, or integrally formed with the pump body structure 31 or the plunger base 34. This is because a lubricant (e.g., lubricating oil) can be injected into the oil reservoir housing (transmission chamber 221) through the liquid guide hole without fear that the thrust bearing 212 will fall out by inverting the swash plate 211.

Because present plant protection unmanned aerial vehicle sprinkling system's operating pressure is lower, even after the nozzle blockked up, the pump chamber of peristaltic pump or diaphragm pump is all flexible moreover, and its pressure can not hold back very high yet, consequently, current sprinkling system does not generally set up the overpressure protection. The utility model provides a plunger pump is applied to sprinkler system, and the operating pressure of one side itself is higher, and on the other hand, the pump chamber of plunger pump is rigid, and in case the liquid outlet blocks up, its pressure will be held back very high, if do not have the overpressure protection measure, just crowd brokenly the pipeline etc. of plunger pump very easily.

Referring to fig. 16 b-16 d and 17 and 18, in some alternative embodiments, to prevent excessive pressure in the pump body structure 31 from damaging the plunger pump 100, the plunger pump 100 may include an overpressure protection structure 50. The pump body structure 31 is provided with an inlet chamber 313 and an outlet chamber 314. The overpressure protection structure 50 is mechanically coupled to the pump body structure 31, and the overpressure protection structure 50 is provided with a return channel that can be switched between an open state and a closed state. Wherein the return channel is in a closed state as shown in fig. 17. As shown in fig. 18, when the backflow passage is in an open state, the liquid in the pump body structure 31 can flow back from the liquid outlet chamber 314 to the liquid inlet chamber 313, and the backflow passage is shown by an arrow in fig. 21.

With the above arrangement, when the pressure in the liquid outlet cavity 314 is too high, the backflow channel can be switched to be in an open state, so that the liquid in the pump body structure 31 can flow back from the liquid outlet cavity 314 to the liquid inlet cavity 313, and the pressure in the liquid cavity 314 is released.

In some alternative embodiments, the overpressure protection structure 50 includes a slide cavity 51 communicated with the fluid outlet cavity 314 and a slide block 52 movably disposed in the slide cavity 51, and the slide cavity 51 forms at least a part of the return channel. When the slider 52 is moved to the first position, the return channel is in a closed state, as shown in fig. 17. When the slider 52 is moved to the second position, the return channel is in an open state, as shown in fig. 18.

In some alternative embodiments, the overpressure protection structure 50 further includes a base 53 connected to the pump body structure 31, the base 53 has the slide cavity 51 formed therein, and the slide cavity 51 is provided with a guide hole communicated with the fluid outlet cavity 314. Alternatively, the base 53 of the overpressure protection structure 50 may be connected to the pump cover 38 of the pump body assembly 30, and a connection hole abutting against the guide hole is formed in the pump cover 38, so that the slide chamber 51 is communicated with the liquid outlet chamber 314.

As shown in fig. 17, when the slider 52 is in the first position, the slider 52 abuts against the base 53 and closes the guide hole, so that the return channel is in a closed state. As shown in fig. 18, when the slide block 52 is in the second position, the slide block 52 is separated from the base 53 to make the guide hole, so that the return channel is in an open state. In the present embodiment, the overpressure protection structure 50 may adopt a valve body structure. The slide 52 can be understood as a valve element of the valve body structure and the base 53 can be understood as a valve seat of the valve body structure. As shown in fig. 17, when the slider 52 is in the first position, the valve element and the valve seat are abutted with each other, so that the return passage is in a closed state. As shown in fig. 18, when the slider 52 is in the second position, the valve element and the valve seat are separated from each other, so that the return passage is in an open state. When the pressure in the liquid outlet cavity 314 of the plunger pump 100 is too high, the valve element can be jacked open, so that the valve element is separated from the valve seat, and the return channel is in an open state. Optionally, a sealing gasket 58 is disposed between the sliding block 52 and the base 53, and when the backflow channel is in a closed state, the sealing performance between the base 53 and the sliding block 52 can be improved.

In some optional embodiments, the backflow channel comprises a backflow hole 54 communicated with the slide chamber 51, and the backflow hole 54 is arranged in the liquid inlet chamber 313. When the pressure in the liquid outlet cavity 314 of the plunger pump 100 is too high, the valve element can be jacked open, so that the valve element is separated from the valve seat, and the return channel is in an open state. Part of the liquid in the liquid outlet chamber 314 can flow into the liquid inlet chamber 313 through the return hole 54, and the pressure in the liquid inlet chamber 313 is released because the pressure in the liquid inlet chamber 313 is not high. Optionally, the liquid inlet cavity 313 comprises a liquid inlet 311, and the backflow hole 54 is disposed on the liquid inlet 311.

In some alternative embodiments, in order to prevent the back surface of the slider 52 from generating back pressure, the slider 52 is prevented from sliding and cannot be separated from the base 53, and the backflow passage cannot be opened. The sliding cavity 51 is provided with a balance hole 55 communicated with the liquid inlet cavity 313, and the balance hole 55 is arranged on the back runner of the sliding block 52, so that the pressure at two sides of the sliding block 52 can be balanced by communicating the balance hole 55 with the liquid inlet cavity 313 due to the fact that no pressure exists in the liquid inlet cavity 313, and the sliding block 52 can slide smoothly when the pressure in the liquid outlet cavity 314 is too high.

In some optional embodiments, the overpressure protection structure 50 further includes an elastic component 56 disposed in the sliding cavity 51, a first end of the elastic component 56 abuts against the bottom of the sliding cavity 51, and a second end of the elastic component 56 is connected to the sliding block 52. The elastic member 56 is used to provide a force to the slider 52 in the direction toward the guide hole. When the pressure in the liquid outlet cavity 314 of the plunger pump 100 is too high, the valve element can be jacked open, so that the valve element is separated from the valve seat, and the return channel is in an open state. After the pressure in the liquid outlet cavity 314 is released, the slider 52 can move towards the direction of the guide hole under the elastic force of the elastic part 56 to abut against the base 53 and block the guide hole, so that the return channel is in a closed state again.

The overvoltage protection structure 50 further includes a pressure adjusting member 57 for adjusting the pre-tightening force of the elastic member 56, and the pressure adjusting member 57 is connected to a second end of the elastic member 56. The pre-tightening force of the elastic component 56 can be set according to the requirement of the preset pressure value in the liquid outlet cavity 314. It can be understood that the opening pressure of the return channel is related to the preload of the elastic member 56, and the preload of the elastic member 56 can be changed by adjusting the pressure adjusting member 57, so as to adjust the opening pressure of the ejection slider 52. Alternatively, the pressure regulating member 57 includes a pressure regulating screw, and an end of the self-sliding chamber 51 away from the guide hole is connected to the elastic member 56. A seal ring 59 may be provided between the pressure adjusting member 57 and the elastic member 56 to improve the sealing property therebetween.

In some optional embodiments, the pressure in the liquid outlet chamber 314 is greater than or equal to a preset value, and the return channel is in an open state. The pressure in the liquid outlet cavity 314 is smaller than a preset value, and the return channel is in a closed state. It will be appreciated that the preset value is set in accordance with the preset pressure requirement within the outlet chamber 314 and the pretension of the resilient member 56 is adjusted accordingly to a value equal to the preset value.

In some optional embodiments, the overpressure protection structure 50 further includes a pressure detection portion disposed in the fluid outlet chamber 314 for detecting a pressure in the fluid outlet chamber 314. Optionally, the pressure detecting portion comprises a pressure sensor for detecting a pressure value in the liquid chamber 314. The pressure detection portion includes a pressure detection hole 591 provided in the liquid outlet chamber 314 and communicating with the return passage. When the pressure in the liquid outlet cavity 314 of the plunger pump 100 is too high, the valve element can be jacked open, so that the valve element is separated from the valve seat, and the return channel is in an open state. The pressure sensor detects the maximum threshold of the pressure in the liquid chamber 314, so that the pretightening force of the elastic component 56 can be adjusted according to the measured value, and when the pressure in the liquid chamber 314 reaches the maximum threshold of the pressure, the backflow channel can be opened, thereby ensuring the effectiveness of the overpressure protection structure 50. Optionally, the liquid outlet cavity 314 includes a liquid outlet 312, and the pressure detecting hole 591 is disposed at the liquid outlet 312.

Since the load of the plunger pump 100 is positively correlated with the system pressure, in order to prevent the pressure in the outlet chamber 314 of the plunger pump 100 from being too high, the embodiment of the present application further provides an overpressure protection method for the plunger pump 100. The plunger pump 100 comprises a pump body structure 31 and a plunger structure 32, the pump body structure 31 is provided with a liquid inlet cavity 313 and a liquid outlet cavity 314, the plunger structure 32 is at least partially accommodated in the pump body structure 31 and can reciprocate in the pump body structure 31, so that the plunger pump 100 sucks liquid into the liquid inlet cavity 313 and extrudes the liquid out of the liquid outlet cavity 314. Referring to fig. 19, the overvoltage protection method includes:

step S1: pressure information within the outlet chamber 314 is determined.

Step S2: when the pressure information exceeds a first preset value, the reciprocating speed of the plunger structure 32 is reduced to reduce the pressure in the liquid outlet cavity 314.

By the above method, when the pressure information in the liquid outlet cavity 314 of the plunger pump 100 exceeds the first preset value, it can be regarded that the pressure in the liquid outlet cavity 314 is too large, and the reciprocating speed of the plunger structure 32 is reduced to reduce the pressure in the liquid outlet cavity 314.

In some optional embodiments, the plunger pump 100 further includes a motor 12 for driving the plunger structure 32 to reciprocate, and the step S2 of reducing the reciprocating speed of the plunger structure 32 includes: the operating speed of the motor 12 is reduced to reduce the reciprocating speed of the plunger structure 32.

Optionally, the plunger pump 100 further comprises a transmission structure connected to the motor 12. The motor 12 drives the transmission structure to rotate so as to drive the plunger structure 32 to reciprocate. The reducing the operation speed of the motor 12 to reduce the reciprocating speed of the plunger structure 32 includes: the operating speed of the motor 12 is reduced to reduce the rotational speed of the transmission structure and thereby reduce the reciprocating speed of the plunger structure 32. In this embodiment, the transmission structure includes a swash plate 211 and a thrust bearing 212 connected to the swash plate 211, the motor 12 is connected to the swash plate 211, and the plunger structure 32 is connected to the thrust bearing 212. The motor 12 drives the swash plate 211 to rotate, which drives the thrust bearing 212 to rotate, and the thrust bearing 212 drives the plunger structure 32 to reciprocate.

Referring to fig. 20, in some alternative embodiments, in step S1, the determining the pressure information in the liquid outlet chamber 314 may further include:

step S11: current information of the motor 12 is detected.

Step S12: and determining pressure information in the liquid outlet cavity 314 according to the current information.

Further, the reducing the reciprocating speed of the plunger structure 32 when the pressure information exceeds the first preset value includes: and when the current information exceeds a preset current value, reducing the running speed of the motor 12. It can be understood that, since the load of the plunger pump 100 is positively correlated with the system pressure, and the current of the motor 12 has a corresponding relationship with the working pressure, the corresponding relationship between the pressure information of the plunger pump 100 and the current information of the motor 12 can be tested in advance, and embedded into a program, and the magnitude of the pressure information is indirectly detected by detecting the current of the motor 12. And when the current information exceeds the preset current value, reducing the rotating speed of the motor 12 through a program until the current of the motor 12 is recovered to a normal level.

Referring to fig. 21, in some alternative embodiments, in step S1, the determining the pressure information in the liquid outlet chamber 314 may further include:

step S13: the pressure value in the outlet chamber 314 is detected.

Step S14: and determining the pressure information in the liquid outlet cavity 314 according to the pressure value.

It is understood that, besides detecting the current of the motor 12 to indirectly detect the magnitude of the pressure information, a pressure gauge may be disposed in the liquid outlet chamber 314 to directly detect the pressure value in the liquid outlet chamber 314 to obtain the pressure information.

In some optional embodiments, in the step S2, when the pressure information exceeds the first preset value, the method may further include the step of: an alarm signal is issued to alert the user of excessive pressure in the effluent chamber 314 to detect a malfunction of the sprinkler system.

In some alternative embodiments, the plunger pump 100 further comprises the overpressure protection structure 50 mechanically coupled to the pump body structure 31, and the overpressure protection structure 50 is provided with a backflow channel that is switchable between an open state and a closed state. When the return channel is in an open state, the liquid can flow back from the liquid outlet chamber 314 to the liquid inlet chamber 313. The method further comprises the following steps: and when the pressure information exceeds a second preset value, opening the backflow channel. It can be understood that, since the volume efficiency of the plunger pump 100 is reduced when the overvoltage protection structure 50 is depressurized, the overvoltage protection structure 50 can be used as an alternative safeguard, and the software-controlled protection mode is preferably adopted to implement the overvoltage protection, and the overvoltage protection structure 50 can be activated when the software-controlled protection mode fails.

Optionally, the pressure information includes a pressure value, and the second preset value is greater than the first preset value. For example, the working pressure of the plunger pump 100 is set to 1MPa, the first preset value corresponding to the software-controlled protection mode is set to 1.25MPa, and the second preset value corresponding to the overpressure protection structure 50 is set to 1.5 MPa. When the detected pressure in the liquid outlet cavity 314 exceeds 1.25MPa, a software-controlled protection mode is preferentially adopted. When the software-controlled protection mode fails, when the detected pressure in the liquid outlet cavity 314 continues to rise to exceed 1.5MPa, the protection mode of the overpressure protection structure 50 can be triggered, that is, the slide block 52 can be pushed open when the pressure in the liquid outlet cavity 314 is too high, so that the backflow channel is in an open state.

In some optional embodiments, the overpressure protection structure 50 further includes a slider 52 disposed in the return channel and an elastic component 56 for driving the slider 52 to move in the return channel, and when the slider 52 moves to the first position, the return channel is in a closed state. When the slide block 52 moves to the second position, the return channel is in an open state. The pressure information includes a pressure value, and the second preset value is equal to the pre-tightening force of the elastic component 56. It will be appreciated that the pre-load of the resilient member 56 can be set according to the predetermined pressure within the outlet chamber 314. The opening pressure of the return channel is related to the pre-tightening force of the elastic component 56, and the pre-tightening force of the elastic component 56 can be changed by adjusting the pressure regulating component 57, so that the opening pressure of the ejection slide block 52 is adjusted.

The utility model provides a plunger pump has light and compact high pressure beneficial effect such as large-traffic, can replace traditional low pressure little flow diaphragm pump or peristaltic pump, can be applied to fields such as sprinkler system or plant protection unmanned aerial vehicle, can improve and spray flow and pressure, reinforcing droplet penetrability to realize that the variable sprays. The flow passage structure of the plunger pump with the compact and weight-reduced design can reduce the volume and the weight. Through above-mentioned sealing member and overflow scheme, can improve plunger pump's corrosion resisting property, sealing reliability and wearability. In addition, in the embodiment of the invention, by adopting the plunger pump structure, the compression ratio of the plunger cavity 310 is very small, and the self-absorption and exhaust capacities are improved; and the flow is basically proportional to the rotating speed, and the flow loss is small after the abrasion.

The embodiment of the present application further provides a spraying system, which includes a plunger pump 100 and at least one nozzle 92 connected to the plunger pump 100, the plunger pump 100 can be connected to an external box, and the box can contain liquid such as liquid medicine. The plunger pump 100 is capable of drawing in and pumping out the liquid in the tank and spraying through the spray head 92. It should be noted that the description of the plunger pump 100 in the above embodiments and embodiments is also applicable to the spraying system of the present embodiment.

The embodiment of the application also provides a spraying control method which can be used for controlling the spraying system to spray or stop spraying. The spraying system comprises a spray head, a plunger pump and an electromagnetic valve for controlling the spray head to open and close; plunger pump includes pump body structure and plunger structure, pump body structure is equipped with feed liquor chamber and goes out the sap cavity, plunger structure at least part is acceptd in the pump body structure, and can reciprocating motion in the pump body structure, so that the plunger pump inhales liquid the feed liquor chamber, will liquid is extruded go out the sap cavity. The spray head is connected with the liquid outlet cavity.

The solenoid valve includes a first open mode or a second open mode. In some optional embodiments, the solenoid valve includes a valve body and a valve core for interfacing with the valve body, and the solenoid valve adopts the first opening mode when the flow direction of the external hydraulic pressure applied to the solenoid valve is along the direction in which the valve core points to the valve body. And when the flow direction of the external hydraulic pressure borne by the electromagnetic valve is opposite to the direction of the valve core pointing to the valve body, the electromagnetic valve adopts the second opening mode. It can be understood that, when the electromagnetic valve adopts the first opening mode, the electromagnetic valve may be a water pressure closing type electromagnetic valve, and the sealing mode is that the water pressure of the external liquid (i.e. external hydraulic pressure) makes the valve core more and more compact, i.e. the pressure of the external liquid helps the sealing of the electromagnetic valve, and the sealing reliability of the valve core is high. The opening of the valve core needs to overcome hydraulic pressure, in order to prevent the electromagnetic valve from generating high pressure after the plunger pump is suppressed to be dead, the electromagnetic valve is prevented from being opened in turn, and finally the spraying system is suppressed to be damaged. When the solenoid valve adopted first opening mode, the solenoid valve can be water pressure open-type solenoid valve, and the sealed scheme is that the water pressure of outside liquid makes the case open, also the pressure of outside liquid helps opening the solenoid valve, and the sealing force of case all derives from the inside spring that sets up of solenoid valve, and also the water pressure of outside liquid is big more, and the spring force that needs is big more.

In order to prevent the solenoid valve from generating high pressure after the plunger pump is blocked due to misoperation, the solenoid valve is prevented from being opened in turn, and finally the spraying system is blocked. Referring to fig. 22, when the solenoid valve adopts the first opening mode, the method includes:

step 31: and opening the electromagnetic valve.

Step 32: after the solenoid valve is opened, the plunger pump is turned on to pump liquid to the spray head.

By the method, the electromagnetic valve is ensured to be opened when the plunger pump is in a working state. The occurrence of the situation that the plunger pump is dead due to pressure can be reduced.

In order to reduce the opening current of the electromagnetic valve, the energy consumption and the heat generation are reduced. Referring to fig. 23, when the solenoid valve adopts the second opening mode, the method includes:

step 41: starting the plunger pump;

step 42: after the plunger pump is turned on, the solenoid valve is turned on to pump the liquid to the spray head.

By the method, the plunger pump is ensured to be operated when the electromagnetic valve is in the open state. The opening current of the electromagnetic valve can be reduced, and the energy consumption and the heat generation are reduced.

Referring to fig. 24, in some alternative embodiments, the step S31 of opening the electromagnetic valve may further include:

step 311: sending an opening instruction to the electromagnetic valve;

step 312: confirming whether the electromagnetic valve is opened or not;

step 313: and if the electromagnetic valve is not opened, sending an opening instruction to the electromagnetic valve again.

Through the arrangement, the plunger pump can be started after the electromagnetic valve is opened, and the situation that the pressure is blocked can be reduced when the electromagnetic valve adopts the first opening mode.

Referring to fig. 25, in some alternative embodiments, the step S41 of turning on the plunger pump may further include:

step 411: sending a starting instruction to the plunger pump;

step 412: confirming whether the plunger pump is started or not;

step 413: and if the plunger pump is not started, sending a starting instruction to the plunger pump again.

Through the arrangement, the electromagnetic valve can be opened after the plunger pump is opened, and when the electromagnetic valve adopts a second opening mode, the opening current of the electromagnetic valve can be reduced, and the energy consumption and the heat generation are reduced.

Referring to FIG. 26, in some alternative embodiments, when the solenoid valve adopts the first open mode, the method further comprises:

step 51: closing the plunger pump;

step 52: after the plunger pump is turned off, the solenoid valve is closed to stop pumping liquid to the spray head.

Through the arrangement, when the plunger pump is in a working state, the electromagnetic valve is ensured to be opened. The occurrence of the situation that the plunger pump is dead due to pressure can be reduced.

Referring to fig. 27, in some alternative embodiments, the step S51 of turning off the plunger pump may further include:

step 511: sending a closing command to the plunger pump;

step 512: confirming whether the plunger pump is closed;

step 513: and if the plunger pump is not closed, sending a closing instruction to the plunger pump again.

Through the arrangement, the electromagnetic valve can be closed after the plunger pump is closed, and the situation that the pressure is blocked can be reduced when the electromagnetic valve adopts the first opening mode.

Referring to FIG. 28, in some alternative embodiments, when the solenoid valve adopts the second open mode, the method further comprises:

step 61: closing the electromagnetic valve;

step 62: after the solenoid valve is closed, the plunger pump is turned off to stop pumping liquid to the spray head.

Referring to fig. 29, in some alternative embodiments, in step S61, the closing the solenoid valve includes:

step S611: sending a closing instruction to the electromagnetic valve;

step S612: confirming whether the electromagnetic valve is closed or not;

step S613: and if the electromagnetic valve is not closed, sending a closing instruction to the electromagnetic valve again.

Through the setting, the plunger pump can be closed after the electromagnetic valve is closed, and when the electromagnetic valve adopts a second opening mode, the opening current of the electromagnetic valve can be reduced, and the energy consumption and the heat generation are reduced.

Referring to fig. 30, the embodiment of the present application further provides a plant protection unmanned aerial vehicle 200, which includes a body 91 and at least one plunger pump 100 installed on the body 91. The body 91 may be provided with a tank for containing liquid such as medical liquid, and at least one nozzle 92 to which a plunger pump 100 may be connected. The plunger pump 100 may be connected to an external tank, and the plunger pump 100 may draw in liquid from the tank and pump it out, and spray it through the spray head 92. It should be noted that the description about the plunger pump 100 in the above embodiments and embodiments is also applicable to the plant protection unmanned aerial vehicle 200 of the present embodiment.

Referring to fig. 5 and 30, in some alternative embodiments, the plant protection drone 200 further includes a plurality of booms, one of which may mount at least one spray head 92, and a mounting bracket 94 mounted to the fuselage 91. The plunger pump 100 is mounted to the mounting bracket 94 and thus to the body 91. In order to improve the accuracy and controllability of the spraying, the plant protection drone 200 further includes a flow meter 90 and a solenoid valve. The flow meter 90 is connected to the plunger pump 100 for detecting a flow signal. The flow meter 90 may employ an electromagnetic flow meter 90 with a high degree of accuracy. In this embodiment, one flow meter 90 may be connected to two plunger pumps 100. The electromagnetic valve is connected with the spray head 92 and is used for controlling the opening and closing of the spray head 92. When plant protection unmanned aerial vehicle 200 flies, the vibrations of plunger pump 100 can lead to the liquid in pump body structure 31 to produce the vibration, and near the liquid of flowmeter 90 electrode also can corresponding vibration, lead to flowmeter 90's detected signal to produce undulantly, for the vibrations that slow down plunger pump 100, installing support 94 with be equipped with shock pad 95 between the plunger pump 100, shock pad 95 can adopt the rubber pad. A rotor assembly 96 may also be provided on horn 93. The bottom of the body 91 may also be provided with a support bracket 97. In this embodiment, plant protection drone 200 is a multi-rotor drone, and the number of horn 93 and rotor assemblies 96 is six. In other examples, plant protection drone 200 may be other numbers of multi-rotor drones.

The embodiment of the application also provides a spraying device, which comprises a main body and at least one plunger pump, wherein the at least one plunger pump is arranged on the main body. It should be noted that the description of the plunger pump in the above embodiments and embodiments is also applicable to the spraying device of the present embodiment. Optionally, the spraying equipment includes a plant protection unmanned aerial vehicle, a pesticide spraying vehicle, a manpower spraying device, a car washer and a doser.

Although the present application has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the application, and all changes, substitutions and alterations that fall within the spirit and scope of the application are to be understood as being covered by the following claims.

The disclosure of this patent document contains material which is subject to copyright protection. The copyright is owned by the copyright owner. The copyright owner has no objection to the facsimile reproduction by anyone of the patent document or the patent disclosure, as it appears in the patent and trademark office official records and records.

Claims

1. A plunger pump, comprising:

the plunger cavity is provided with a liquid inlet and a liquid outlet;

a seal in sealing engagement with the plunger structure, the seal comprising:

2. The plunger pump of claim 1, wherein the first and second seals are at least one of non-identical in shape and size.

3. The plunger pump of claim 2, wherein the first seal portion is not the same height as the second seal portion.

4. The plunger pump of claim 3, wherein the height of the first sealing portion is less than the height of the second sealing portion.

5. The plunger pump of claim 1, wherein the thickness of the first seal is different than the thickness of the second seal.

6. The plunger pump of claim 5, wherein the first sealing portion has a thickness greater than a thickness of the second sealing portion.

7. The plunger pump according to claim 2, wherein the first sealing portion includes a first sealing lip and a second sealing lip adjacent to the first sealing lip in an axial direction of the annular body portion, the first sealing lip and the second sealing lip are both disposed obliquely with respect to the axial direction of the annular body portion, and an included angle of the first sealing lip with respect to the axial direction of the annular body portion is different from an included angle of the second sealing lip with respect to the axial direction of the annular body portion.

8. The plunger pump according to claim 7, wherein the first sealing lip is located on a side away from the annular body portion in an axial direction of the annular body portion, and an included angle of the first sealing lip with respect to the axial direction of the annular body portion is larger than an included angle of the second sealing lip with respect to the axial direction of the annular body portion.

9. The plunger pump of claim 2, wherein the side wall of the first sealing portion remote from the recess is formed with a multi-layered sealing lip.

10. The plunger pump of claim 1, wherein the inner side wall and the outer side wall of the annular body portion are both disposed at an angle to the axial direction of the annular body portion, and the included angle between the inner side wall of the annular body portion and the included angle between the outer side wall of the annular body portion and the axial direction of the annular body portion are different.

11. The plunger pump of claim 10, wherein the included angle of the inner side wall of the annular body portion with respect to the axial direction of the annular body portion is smaller than the included angle of the outer side wall of the annular body portion with respect to the axial direction of the annular body portion.

12. The plunger pump of claim 1, wherein a side of the inner sidewall of the annular body portion remote from the first seal portion is formed with a chamfered portion.

13. The plunger pump of claim 1, wherein the inner sidewall of the annular body portion is provided with a dust ring.

14. The plunger pump of claim 1, wherein a side of the first sealing portion adjacent the plunger structure and a side of the annular body portion adjacent the plunger structure collectively form a multi-layered sealing lip.

15. The plunger pump of claim 1, wherein the inner side wall of the recess is provided with an elastic ring.

16. The plunger pump of claim 1, wherein the seal comprises at least one of a rubber seal and a polyurethane seal.

17. A plant protection unmanned aerial vehicle, comprising a fuselage and at least one plunger pump as claimed in any one of claims 1-16, the at least one plunger pump being mounted to the fuselage.

18. A plunger pump, comprising:

the plunger cavity is provided with a liquid inlet and a liquid outlet;

19. The plunger pump of claim 18, wherein the two seals separate the plunger cavity into an avoidance cavity, an overflow cavity, and a pumping cavity, the avoidance cavity and the pumping cavity being located at respective ends of the plunger cavity, the overflow cavity being located in a middle portion of the plunger cavity.

20. The plunger pump as recited in claim 19 wherein said bypass cavity contains a lubricant, said seal adjacent said bypass cavity for inhibiting said lubricant from flowing into said overflow cavity.

21. The plunger pump of claim 19, wherein the pumping chamber contains a medical fluid and the seal adjacent the pumping chamber prevents the medical fluid from flowing into the overflow chamber.

22. The plunger pump of claim 19, wherein the two seals comprise a first seal disposed proximate the pumping chamber and a second seal disposed proximate the bypass chamber.

23. The plunger pump of claim 22, further comprising a guide block disposed between the first seal and the second seal, the plunger structure being disposed through the guide block and capable of reciprocating relative to the guide block.

24. The plunger pump of claim 23, wherein the guide block includes a first compression portion and a second compression portion connected to the first compression portion, the first compression portion being proximate the first seal and the second compression portion being proximate the second seal.

25. The plunger pump of claim 23, wherein the guide block is of stepped configuration.

26. The plunger pump of claim 25, further comprising a pump body structure and a plunger base connected to the pump body structure, wherein the guide block is provided at an outer side thereof with a first stepped annular surface and a second stepped annular surface, the first stepped annular surface cooperating with the plunger base, and the second stepped annular surface cooperating with the pump body structure to ensure concentricity of the plunger base and the pump body structure.

27. The plunger pump of claim 26, wherein an inner annular surface of the guide block engages the plunger structure to ensure concentricity of the plunger base, the pump body structure, and the plunger structure.

28. The plunger pump of claim 23, wherein at least one of the inner and outer walls of the guide block is provided with a third seal.

29. The plunger pump of claim 28, wherein the inner wall of the guide block is provided with the third seal, and the third seal is spaced from the first and second seals by a distance greater than a stroke distance of the plunger structure.

30. The plunger pump of claim 28, wherein the outer wall of the guide block is provided with a fourth seal having a diameter greater than the diameter of the third seal.

31. The plunger pump of claim 23, wherein the guide block comprises a plastic guide block or a soft metal guide block.

32. The plunger pump of claim 18, further comprising a pump body structure, the plunger cavity being at least partially located within the pump body structure; the pump body structure comprises a bottom surface, and the bottom surface is provided with an opening communicated with the plunger cavity; the bottom surface is provided with an overflow groove used for discharging the liquid overflowing from the plunger cavity out of the plunger cavity.

33. The plunger pump of claim 32, wherein said overflow channel extends from a middle portion of a bottom surface of said pump body structure to said plunger cavity, respectively, to drain liquid spilled from said plunger cavity out of said plunger cavity.

34. The plunger pump of claim 32, wherein said overflow channel extends to an edge of a bottom surface of said pump body structure to drain liquid spilled from said plunger cavity out of said plunger cavity.

35. The plunger pump of claim 32, further comprising a reservoir on a bottom surface of the pump body structure, the reservoir in communication with the overflow tank.

36. The plunger pump of claim 35, wherein the sump extends to an edge of a bottom surface of the pump body structure to drain liquid spilled from the plunger cavity out of the plunger cavity.

37. The plunger pump of claim 33, wherein the spill orifice comprises a first spill orifice provided in one of the two seals adjacent the pump body structure, the first spill orifice extending to the opening and communicating with the spill groove.

38. The plunger pump of claim 32, wherein the plunger cavity has an inner wall axially defining a first receiving groove in the pump body structure, and one of the two seals is disposed in the first receiving groove adjacent to the pump body structure.

39. The plunger pump of claim 38, wherein the bottom wall of the first receiving groove is formed with a first chamfered portion.

40. The plunger pump of claim 37, further comprising a plunger base coupled to the pump body structure, the plunger cavity being at least partially located within the plunger base, a side wall of the plunger base having a guide groove;

the overflow hole comprises a second overflow hole, the second overflow hole is arranged in one of the two sealing pieces close to the plunger base, and the second overflow hole is communicated with the diversion trench.

41. The plunger pump of claim 40, wherein the inner wall of the plunger cavity within the plunger base is axially provided with a second receiving groove, one of the two seals being located within the second receiving groove adjacent to the plunger base.

42. The plunger pump of claim 41, wherein the bottom wall of the second receiving groove is formed with a second chamfered portion.

43. The plunger pump of claim 40, wherein the bottom of the plunger base is provided with a guide sleeve corresponding to the position of the plunger cavity, and the plunger structure is arranged through the guide sleeve and can reciprocate relative to the guide sleeve.

44. The plunger pump of claim 43, wherein the inner wall of the guide sleeve is provided with a recessed portion, the recessed portion being provided with a guide ring.

45. The plunger pump of claim 43, wherein the guide sleeve top end has an outer diameter that is greater than an outer diameter of the guide sleeve bottom end.

46. The plunger pump of claim 43, wherein the top of the guide sleeve is provided with a fluid channel that extends to the side wall of the guide sleeve.

47. The plunger pump of claim 43, further comprising a plunger spring sleeved on the plunger structure, wherein a first end of the plunger spring is sleeved on the guide sleeve and abuts against the bottom of the plunger base, and a second end of the plunger spring is connected with the plunger structure.

48. The plunger pump of claim 40, wherein the first spill orifice has a larger bore diameter than the second spill orifice.

49. A plant protection unmanned aerial vehicle, comprising a fuselage and at least one plunger pump of any of claims 18-48 mounted to the fuselage.

50. A plunger pump, comprising:

the transmission cavity is provided with a lubricant;

a plunger cavity in communication with the drive cavity;

a plunger structure at least partially received within the plunger cavity;

a magnetic component mechanically coupled to the drive cavity,

51. The plunger pump of claim 50, wherein said magnetic component is disposed inside or outside of said drive chamber; when the magnetic part is arranged outside the transmission cavity, the magnetic field generated by the magnetic part can penetrate through the inner wall of the transmission cavity.

52. The plunger pump of claim 50, wherein the side wall of the transmission cavity is provided with a liquid guide hole, and the magnetic component is arranged in the transmission cavity at a position corresponding to the liquid guide hole.

53. The plunger pump of claim 52, further comprising a sealing plug for sealing the fluid-conducting hole, wherein the magnetic member is mechanically coupled to the sealing plug, and wherein the sealing plug is removably connected to the drive chamber at the location of the fluid-conducting hole.

54. The plunger pump of claim 53, wherein the drainage hole is opened in the transmission cavity at a position corresponding to a contact position of the transmission structure and the plunger structure.

55. The plunger pump of claim 53 wherein said magnetic member includes a debris attracting magnet and a debris reservoir at said fluid bore, said debris reservoir being adjacent said debris attracting magnet.

56. The plunger pump of claim 50, wherein said power means drives rotation of said transmission structure to reciprocate said plunger structure; the magnetic component is arranged along the tangential direction of the rotation direction of the transmission structure and the transmission cavity.

57. The plunger pump of claim 50, wherein the transmission chamber is connected to the motive device.

58. The plunger pump of claim 50, wherein the transmission structure includes a guide sleeve through which the plunger structure is disposed.

59. The plunger pump of claim 58, wherein the transmission structure includes a plunger base, the guide sleeve is connected to the plunger base, and the plunger structure is disposed through the plunger base and the guide sleeve.

60. The plunger pump of claim 58, wherein a guide ring is disposed between the plunger structure and the inner wall of the guide sleeve.

61. The plunger pump of claim 60, wherein the guide ring comprises a plastic guide ring or a soft metal guide ring.

62. The plunger pump of claim 50, further comprising a pump body structure having a fluid inlet chamber and a fluid outlet chamber, the plunger chamber being disposed within the pump body structure;

the plunger structure reciprocates in the plunger cavity, so that the plunger pump sucks liquid into the liquid inlet cavity and extrudes the liquid out of the liquid outlet cavity.

63. The plunger pump of claim 62, wherein the pump body structure is removably connected to the transmission cavity.

64. The plunger pump of claim 50, wherein the transmission chamber is removably coupled to the motive device.

65. A plant protection unmanned aerial vehicle, comprising a fuselage and at least one plunger pump of any of claims 50-64, the at least one plunger pump mounted to the fuselage.

66. A spraying device comprising a body and at least one plunger pump as claimed in any one of claims 1 to 16, 18 to 48, 50 to 64, the at least one plunger pump being mounted to the body.

67. The spraying apparatus of claim 66, wherein said spraying apparatus comprises a plant protection drone, a pesticide spray vehicle, a manual spray device, a car washer, and a doser.