WO2022095071A1

WO2022095071A1 - Plunger pump, plant-protection unmanned aerial vehicle, and spray device

Info

Publication number: WO2022095071A1
Application number: PCT/CN2020/127642
Authority: WO
Inventors: 舒展; 周乐; 高俊彰
Original assignee: 深圳市大疆创新科技有限公司
Priority date: 2020-11-09
Filing date: 2020-11-09
Publication date: 2022-05-12
Also published as: CN114746649A

Abstract

The present application provides a plunger pump, a plant-protection unmanned aerial vehicle, and a spray device. The plunger pump comprises: a plunger cavity, provided with a liquid inlet and a liquid outlet; a plunger structure at least partially received in the plunger cavity and capable of performing reciprocating motion in the plunger cavity to suck liquid from the liquid inlet and discharge the liquid from the liquid outlet; and a seal member in sealable engagement with the plunger structure. The seal member comprises: an annular body portion having a first side and a second side along an axial direction, and an inner side and an outer side along a radial direction; a first seal portion extending, from the surface of the first side of the annular body portion, in a direction away from the first side and being configured to be adjacent to the inner side of the annular body portion; and a second seal portion extending, from the surface of first side of the annular body portion, in a direction away from the first side and being configured to be adjacent to the outer side of the annular body portion. The first seal portion and the second seal portion are spaced apart to form a notch on the first side of the annular body portion, and the first seal portion and the second seal portion are configured in an asymmetric structure, thus improving a sealing effect and the wear resistance.

Description

Plunger pumps, plant protection drones and spraying equipment

technical field

The present application relates to the technical field of spraying, and in particular, to a plunger pump, a plant protection drone and spraying equipment.

Background technique

With the gradual promotion of plant protection drones, the demand for large-flow spraying is also increasing. The volume and weight of conventional large-flow diaphragm pumps or peristaltic pumps used in plant protection drones are relatively large. In addition, due to changes in flight speed and other reasons, plant protection drones have the need for variable spraying, while conventional diaphragm pumps or peristaltic pumps are prone to liquid leakage and cannot meet the spraying requirements.

SUMMARY OF THE INVENTION

The application provides a plunger pump, a plant protection drone and a spraying device.

Specifically, the application is achieved through the following technical solutions:

In a first aspect, an embodiment of the present application provides a plunger pump, including:

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

a plunger structure, at least partially accommodated in the plunger cavity, and capable of reciprocating movement in the plunger cavity, sucking liquid from the liquid inlet, and extruding the liquid from the liquid outlet; and

a sealing element, the sealing element is in sealing cooperation with the plunger structure, and the sealing element comprises:

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

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

a second sealing portion, the second sealing portion extends from the first side surface of the annular body portion in a direction away from the first side, and is disposed adjacent to the outer side of the annular body portion;

Wherein, the first sealing part and the second sealing part are spaced apart to form a notch on the first side of the annular body part, and the first sealing part and the second sealing part are arranged asymmetrically structure.

In a second aspect, the embodiments of the present application provide a plunger pump, including:

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

Two seals are arranged in the middle of the plunger cavity, and the two seals are relatively spaced apart, and the plunger structure is in sealing fit with the two seals to prevent the liquid from passing The gap between the seal and the inner wall of the plunger cavity or/and the plunger structure flows out,

Wherein, the plunger cavity is provided with an overflow hole located between the two seals, and the liquid flowing between the two seals can flow out through the overflow hole.

In a third aspect, the embodiments of the present application provide a plunger pump, including:

The transmission cavity is provided with lubricants;

a transmission structure, which is accommodated in the cavity of the transmission cavity;

a plunger cavity, communicated with the transmission cavity;

a plunger structure, at least partially accommodated in the plunger cavity;

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

a magnetic component, mechanically coupled with the transmission cavity,

Wherein, the magnetic component can adsorb the solid particles in the lubricant.

In a fourth aspect, the embodiments of the present application provide a plant protection drone, including a fuselage and at least one plunger pump mounted on the fuselage; the plunger pump includes:

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

In a fifth aspect, the embodiments of the present application provide a plant protection drone, including a fuselage and at least one plunger pump mounted on the fuselage; the plunger pump includes:

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

Two seals are arranged in the middle of the plunger cavity, and the two seals are relatively spaced apart, and the plunger structure is in sealing cooperation with the two seals to prevent the liquid from passing The gap between the seal and the inner wall of the plunger cavity or/and the plunger structure flows out,

In a sixth aspect, the embodiments of the present application provide a plant protection drone, including a fuselage and at least one plunger pump installed on the fuselage; the plunger pump includes:

The transmission cavity is provided with lubricants;

a plunger cavity, communicated with the transmission cavity;

a plunger structure, at least partially accommodated in the plunger cavity;

a magnetic component, mechanically coupled with the transmission cavity,

In a seventh aspect, embodiments of the present application provide a spraying device, comprising a main body and at least one plunger pump according to the first, second and third aspects, wherein the at least one plunger pump is mounted on the main body.

In the present application, by configuring the first sealing part and the second sealing part of the sealing member in sealing cooperation with the plunger structure into an asymmetric structure, the sealing effect and wear resistance of the sealing member can be improved, and the leakage of the liquid in the plunger structure can be prevented. .

Description of drawings

FIG. 1 is a schematic perspective view of a plunger pump in an embodiment of the present application.

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

FIG. 3 is an exploded schematic diagram of the plunger pump in an embodiment of the present application removing the structure of the pump body.

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

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

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

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

8 is a partial cross-sectional exploded schematic view of the pump body structure of the plunger pump in an embodiment of the present application.

9a to 9c are cross-sectional views of different sections of a pump body structure of a 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 schematic partial enlarged schematic diagram of FIG. 11 .

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

FIG. 14 and FIG. 15 are partial exploded schematic diagrams of the plunger pump in another embodiment of the present application from two different viewing angles.

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

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

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

FIG. 19 is a flowchart of an overpressure protection method for a plunger pump in an embodiment of the present application.

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

22 is a schematic perspective view of a plant protection drone in an embodiment of the present application.

Detailed ways

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application.

The application provides a plunger pump, a plant protection drone and a spraying device. The plunger pump, the plant protection drone and the spraying equipment of the present application will be described in detail below with reference to the accompanying drawings. The features of the embodiments and implementations described below may be combined with each other without conflict.

The embodiment of the present application provides a plunger pump 100, which can be used for devices and equipment that need to spray liquid, such as agricultural plant protection drones, pesticide spraying vehicles, manpower spraying devices, car washers, and dosing devices. Taking plant protection drones as an example, with the gradual promotion of plant protection drones, the demand for large-flow spraying is also increasing. The volume and weight of conventional large-flow diaphragm pumps or peristaltic pumps used in plant protection drones are relatively large. In addition, due to reasons such as changes in flight speed, plant protection drones have the need for variable spraying, while the pressure of conventional diaphragm pumps or peristaltic pumps is limited and cannot meet the spraying requirements. The plunger pump 100 provided by the embodiment of the present application can reach a relatively high pressure, and can meet the spraying requirements of large flow and variable flow. In addition, the structure of the plunger pump 100 is light and compact, takes up little space, and can reduce the overall weight of the drone.

Referring to FIGS. 1 to 4 , the plunger pump 100 includes a power device 10 , a transmission device 20 and a pump body assembly 30 , and the transmission device 20 is connected between the pump body assembly 30 and the power device 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, and the transmission structure is connected with the power device 10 and the plunger structure 32. 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 a liquid inlet 311 and a liquid outlet 312, and the plunger structure 32 and the pump body structure 31 form a sealed pump cavity. In the embodiment shown in Figures 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 within the pump body structure 31 to increase or decrease The pressure of the liquid in the pump body structure 31 causes the plunger pump 100 to inhale the liquid from the liquid inlet 311 and extrude the liquid from the liquid outlet 312 .

Wherein, in one embodiment, the power device 10 includes a motor housing 11 , a motor 12 , an ESC 13 and a motor base 14 , an opening is provided at the top of the motor housing 11 , and the motor base 14 is connected to the opening of the motor housing 11 . position, the motor 12 is mounted on the motor base 14 . The ESC 13 is electrically connected to the motor 12 for controlling the motor 12 to generate power. The motor 12 includes a rotating shaft 121 , and the rotating shaft 121 passes through the motor base 14 and the transmission device 20 and partially extends into the interior of the transmission device 20 to be connected with the transmission structure. The motor 12 is used to provide 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 housing 11 , and the ESC 13 can be accommodated and disposed in the accommodating cavity 111 . Optionally, the ESC 13 is located between the motor 12 and the motor base 14 and protrudes from the motor 12 . The motor housing 11 includes a main body part and an auxiliary body part, the main body part is used for accommodating the motor 12 , and the auxiliary body part is used for accommodating the part of the ESC 13 protruding from the motor 12 . Integrating the ESC 13 inside the motor 12 facilitates the arrangement of devices such as temperature sensors and Hall sensors on the one hand, and makes the structure of the power unit 10 more compact on the other hand.

In one embodiment, the transmission device 20 may include a transmission case 22, and a transmission cavity 221 (explained below may be referred to as an oil storage housing) is formed in the transmission case 22. The transmission structure is arranged in the transmission cavity 221 on the side of the motor base 14 away from the motor 12 , and the transmission structure is connected with the rotating shaft 121 of the motor 12 . The gear box 22 is connected to the top of the motor base 14 . The rotating shaft 121 of the motor 12 passes through the bottom of the transmission case 22 and partially extends into the transmission cavity 221 to be connected to the transmission structure, that is, the transmission cavity 221 is connected to the power device 10 . Optionally, 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 mounted on the upper surface of the swash plate 211 , and the plunger structure 32 is provided on the upper surface of the thrust bearing 212 . The rotating shaft 121 of the motor 12 passes through the motor base 14 and the bottom of the transmission box 22 and is connected to the swash plate 211 . 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 .

Referring to FIG. 5 , the plunger pump 100 can work together with the flowmeter 90. When the plunger pump 100 is working, an electromagnetic signal will be generated when the motor 12 and the ESC 13 are energized, and the resulting electromagnetic interference will affect the flowmeter. The detection accuracy of 90 has an impact. 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 motor base. The metal motor base and the metal shell are fixedly connected and enclosed into a shielding space, and the motor 12 and the electric adjustment board 13 are both arranged in the shielding space. The ESC 13 includes a ground terminal, and a metal motor base or a metal casing is electrically connected to the ground terminal, so as to introduce the electromagnetic interference signal (ie, interference electrons) generated by the motor 12 into the ground terminal, thereby reducing the number of columns. The effect of electromagnetic interference signals generated by the plug pump 100 on the flow meter 90 . Optionally, electromagnetic shielding measures can be taken on the metal casing to further reduce the influence of the electromagnetic interference signal generated by the plunger pump 100 on the flowmeter 90.

Through the above arrangement, the motor 12 and the ESC 13 are placed in the shielding space enclosed by the metal motor base and the metal casing, and the metal motor base or the metal casing is electrically connected to the ground terminal of the ESC 13, thereby connecting the The electromagnetic interference signal generated by the motor 12 is introduced into the ground terminal, so as to reduce the influence of the electromagnetic interference signal generated by the plunger pump 100 on the flow meter 90 .

In some optional embodiments, a metal bearing 15 is provided between the metal motor base and the rotating shaft 121 , so that the electromagnetic interference signals generated on the rotating shaft 121 can be introduced into the ground terminal of the ESC 13 in sequence. Therefore, the influence of the electromagnetic interference signal generated by the plunger pump 100 on the flow meter 90 is reduced. Optionally, the electric machine 12 also includes a rotor 122 .

In some optional embodiments, the metal motor base is electrically connected to the metal casing, and the metal motor base is electrically connected to the ground terminal of the ESC 13 . The metal motor base is electrically connected to the ground terminal of the ESC board 13, and then the metal casing is electrically connected to the metal motor base, so that the electromagnetic interference signal generated on the rotating shaft 121 of the motor 12 is introduced into the ESC through the metal casing and the metal motor base in turn. On the ground end of the plate 13, the influence of the electromagnetic interference signal generated by the plunger pump 100 on the flow meter 90 is reduced.

Optionally, the metal motor base and the metal casing are electrically connected through a first metal screw, and the metal motor base and the ground end of the ESC 13 are electrically connected through a second metal screw 131 . The electromagnetic interference signal generated by the plunger pump 100 can be introduced to the grounding end of the ESC 13 through the metal casing, the first metal screw, the metal motor base and the second metal screw 131 in sequence.

Referring to FIG. 6 , in some optional embodiments, the pump body assembly 30 further includes an electrical connection assembly, and the electrical connection assembly includes a plunger pump plug 331 and a connecting wire 332 , the plunger pump plug 331 The part protruding from the motor 12 is inserted into the ESC 13 and accommodated in the auxiliary body part of the motor housing 11 . The connecting wire 332 is connected to the plunger pump plug 331 for further conducting the electromagnetic interference signal on the ground end of the ESC 13 to the outside. Taking the application of the plunger pump 100 to a plant protection drone as an example, the connecting wire 332 includes a connecting wire plug 333, and the connecting wire plug 333 can be electrically connected to the flight control system of the plant protection drone, and the flight control system can include a main control board , the main control board can be provided with a ground terminal, so that the electromagnetic interference signal generated by the plunger pump 100 can be conducted to the ground terminal of the main control board of the flight control system through the plunger pump plug 331 and the connecting wire 332, thereby reducing the number of plungers The effect of electromagnetic interference signals generated by the pump 100 on the flow meter 90 . Optionally, the plant protection drone may further include a battery, the battery is connected to the main control board, and the electromagnetic interference signal generated by the plunger pump 100 can be further conducted to the negative electrode of the battery to be grounded.

Referring to FIGS. 3 and 4 , in some optional 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 on the plunger base 34 . The plunger structure 32 passes through the plunger base 34 and is at least partially located in the pump body structure 31 . The plunger includes a plunger rod 321 and a flange 322 , and the flange 322 protrudes from the body. the edge of the plunger rod 321. The first end (shown as the top end in the figure) of the plunger spring 35 abuts on the plunger base 34, and the second end (shown as the bottom end 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 the direction of 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 is formed from the The plunger base 34 passes through the plunger base 34 and extends into the plunger cavity 310 . The plunger base 34 is provided with a guide hole 341 extending therethrough along the movement direction of the plunger structure 32 (the vertical direction shown in the figure), and the guide hole 341 corresponds to the position of the plunger cavity 310 . The plunger structure 32 passes through the guide hole 341 and is at least partially accommodated in the plunger cavity 310 . 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, the bottom of the plunger base 34 is provided with a guide sleeve 342, the guide sleeve 342 corresponds to the position of the plunger cavity 310, and the plunger structure 32 passes through the guide sleeve 342 and can be A reciprocating motion is performed relative to the guide sleeve 342 . When the transmission structure rotates, the plunger structure 32 is pushed through the guide sleeve 342 and the guide hole 341 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 can be directly integrated on the plunger base 34 and formed integrally with the plunger base 34 . In order to facilitate the replacement of the plunger structure 32 after wear and reduce the wear on the plunger structure 32, the inner wall of the guide sleeve 342 is provided with a groove portion, and a guide ring 343 is provided in the groove portion. The material can be soft metal such as wear-resistant plastic or copper alloy, so as to reduce the 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 the outer diameter of the bottom end of the guide sleeve 342 . It can be understood that the outer diameter of the root of the guide sleeve 342 on the side close to the plunger base 34 is larger, which is used to constrain the position of the plunger spring 35 . The outer diameter of the end of the guide sleeve 342 away from the plunger base 34 is small, which is used to avoid the plunger spring 35 when the plunger spring 35 reciprocates with the plunger structure 32 to reduce wear between the two.

The liquid inlet 311 of the pump body structure 31 can be connected to an external box, and the box can hold liquids such as liquid medicine, and the liquid can be introduced into the pump body structure 31 through the liquid inlet 311 . The liquid outlet 312 of the pump body structure 31 can be connected to the spray head for spraying the medicinal liquid. In this embodiment, when the thrust bearing 212 rotates from the lowest point to the highest point, the thrust bearing 212 can push the plunger structure 32 to move upwards in the plunger cavity 310 along the guide hole 341 , so as to increase the inner space of the plunger cavity 310 Therefore, the liquid in the pump body structure 31 is squeezed out of the liquid outlet 312, and the plunger spring 35 is in a compressed state during this process. When the thrust bearing 212 rotates from the highest point to the lowest point, the plunger spring 35 is elastically reset, and provides an elastic force to the plunger structure 32 in the direction of the thrust bearing 212, so that the plunger pump 100 The liquid is sucked into the liquid inlet 311 . In this way, the reciprocating cycle can realize the spraying operation.

In some optional embodiments, the plunger structure 32 is a hollow plunger with a hollow structure, and the hollow part can be filled with a material with a lower density, thereby reducing the overall weight of the plunger pump 100 . Further, the plunger structure 32 includes a plunger rod 321 and a flange 322 detachably connected to the bottom of the plunger rod 321 , and the flange 322 protrudes outward from the plunger rod along the radial direction of the plunger rod 321 . On the edge of 321, the second end of the plunger spring 35 is sleeved on the plunger rod 321 and connected with the flange 322. During the upward movement of the plunger structure 32, the plunger spring 35 can be squeezed through the flange 322 to make The plunger spring 35 is in a compressed state. The plunger rod 321 can be made of wear-resistant and anti-corrosion materials such as wear-resistant stainless steel or ceramics by turning. The plunger rod 321 can have a hollow structure, and the flange 322 can be machined from high-strength steel into a circlip structure, which is easy to be clamped to the rod. on the plunger 321. By making the plunger structure 32 a detachable structure, the cutting amount of the plunger structure 32 can be reduced, thereby reducing the manufacturing cost.

In some optional 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 housing form a sealed cavity for accommodating the transmission structure. In addition, there is lubricating substance in the sealing cavity, 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 can be understood that the oil storage housing can be understood as being enclosed and formed by the side wall of the above-mentioned transmission cavity 221 , and the sealing cavity can be understood as an oil storage cavity. The metal motor base, the oil storage housing and the plunger base 34 constitute the sealed cavity. The lubricant may include lubricating oil or grease, which can reduce wear between the plunger structure 32 and the swash plate 211 and the plunger base 34 . Optionally, the top of the guide sleeve 342, that is, the side wall close to the plunger base 34, is provided with a liquid guide groove, and the liquid guide groove extends to the side wall of the guide sleeve 342, which is convenient for the lubricant to flow freely. The liquid guiding groove flows between the guide sleeve 342 and the plunger structure 32 , infiltrates the plunger structure 32 and the guide sleeve 342 , and further reduces the wear between the plunger structure 32 and the swash plate 211 and the plunger base 34 .

Since the thrust bearing 212 is disposed on the upper surface of the swash plate 211 , when the swash plate 211 is inverted, the thrust bearing 212 will fall out. In order to avoid the above situation, the plunger base 34 and the oil storage housing can be detachably connected by fasteners such as screws 344 . The oil storage housing can be fixedly connected to the motor base 14, or can be integrally formed with the motor base 14, so that the filling direction of the lubricant is from the top of the oil storage housing. In this way, when the lubricant needs to be added, the plunger base 34 can be removed from the oil storage housing, and the lubricant can be added directly without turning the plunger pump 100 upside down to avoid the thrust bearing 212 falling from the swash plate 211. situation happens. Optionally, the oil storage housing is integrally formed with the motor base 14 .

In addition to the electromagnetic interference of the plunger pump 100 caused by the electrical power of the motor 12 and the ESC 13, it may also be conducted by the pump body structure 31 or the plunger structure 32 to the water circuit, and then transmitted to the electrode of the flow meter 90 through the water circuit, so that the flow rate The signal of the meter 90 fluctuates, affecting the accuracy. In order to prevent the above electromagnetic interference, in some optional embodiments, the pump body structure 31 further includes a pump body shell, the pump body shell is a metal shell, the oil storage shell is a metal shell, the column The plug base 34 is a metal base 53 . The pump body shell is electrically connected to the metal motor seat through the plunger base 34 and the oil storage shell in turn, so as to transmit the electromagnetic interference signal generated in the liquid in the pump body structure 31 to the metal motor seat, and then pass through the metal motor seat. The metal motor base is introduced into the grounding end of the ESC 13 , thereby reducing the influence of the electromagnetic interference signal generated by the plunger pump 100 on the flow meter 90 .

At present, the design of the flow channel of the conventional plunger pump 100 is relatively complicated, and the main problem is that the arrangement of the plunger cavity 310 is relatively scattered and the structure is not compact enough, resulting in the large weight and volume of the plunger pump 100 . In addition, the water inlet and outlet channels of the conventional plunger pump 100 are complicated, which leads to difficulty in forming and increases the manufacturing cost. Referring to FIG. 7 and FIG. 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 communicates with a plurality of the liquid inlet cavities 313 , and is used for diverting the liquid flowing into the liquid inlet 311 into the plurality of the liquid inlet cavities 313 .

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

A plurality of plunger cavities 310, the plurality of plunger cavities 310 and the plurality of the liquid inlet chambers 313 communicate with each other in pairs, for receiving the liquid flowing out of the liquid inlet chambers 313, and more The pressure of the liquid in the plunger cavity 310 .

A plurality of liquid outlet cavities 314 , and the plurality of the liquid outlet cavities 314 and the plurality of the plunger cavities 310 communicate with each other, and are used for receiving the liquid pressurized by the plunger cavities 310 . The plurality of liquid outlet cavities 314 are respectively disposed along the axial direction of the plurality of plunger cavities 310 . In the embodiment of the present invention, the plurality of the liquid outlet cavities 314 are respectively arranged along the axial extension of the plurality of the plunger cavities 310, which refers to the plurality of the liquid outlet cavities 314 and the plurality of the plungers Cavities 310 extend substantially in the same direction. In the embodiment of the present invention, the shapes of the liquid outlet cavity 314 and the plunger cavity 310 are not specifically limited, and they may be straight tube type, serpentine type, bent type, and the like.

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

A liquid outlet 312, the liquid outlet 312 communicates with the plurality of the liquid outlet cavities 314, and is used for confluence and discharge of the liquid in the plurality of the liquid outlet cavities 314.

Through the above arrangement, each of the liquid inlet chambers 313 , the plunger chambers 310 and the liquid outlet chambers 314 communicate with each other to form the flow channel structure of the pump body structure 31 . A plurality of the liquid outlet chambers 314 are respectively arranged along the axial direction of the plurality of the plunger chambers 310, so that the extension directions of the liquid outlet chambers 314 and the plunger chambers 310 are the same (both shown in the figure are along the vertical direction). Straight direction), so that the pump body structure 31 achieves the effect of compact structure.

In some optional embodiments, the liquid inlet 311 may be provided with a water inlet connector 315 , and the liquid outlet 312 may be provided with a water outlet connector 316 . A water outlet one-way valve 317 can be arranged in the liquid outlet chamber 314, which restricts the liquid flow direction only from the side of the liquid outlet chamber 314 close to the plunger chamber 310 to the other side away from the plunger chamber 310, and cannot flow back from the opposite direction . In one embodiment, it opens when the pressure in the plunger pump 100 increases, so that the liquid in the liquid outlet chamber 314 is discharged through the water outlet joint 316 . A water inlet one-way valve 319 can be arranged in the liquid inlet chamber 313, which restricts the flow direction of the liquid to only flow from the side of the liquid outlet chamber 314 close to the plunger chamber 310 to the other side away from the plunger chamber 310, but not from the opposite direction. backflow. In one embodiment, it is opened when the pressure in the plunger pump 100 is reduced, so that the liquid in the external water tank is sucked in through the water inlet joint 315 and introduced into the liquid inlet chamber 313 . It should be noted that the number of plunger structures 32 corresponds to the number of plunger cavities 310 , and each plunger cavity 310 is provided with a plunger structure 32 for changing the pressure in the plunger cavity 310 . When the plunger structure 32 extends into the plunger cavity 310, the volume in the plunger cavity 310 is reduced, and only the water outlet one-way valve 317 can be opened to pump out the liquid. When the plunger structure 32 is drawn out, the internal volume of the plunger cavity 310 increases, and only the water inlet check valve 319 can be opened to suck in the liquid. A sealing strip 384 may be provided at the connection between the water inlet joint 315 and the liquid inlet 311 and the connection between the water outlet joint 316 and the liquid outlet 312 . In this embodiment, the number of the plunger chambers 310 is three, which constitutes the triplex plunger pump 100 . Of course, in other examples, the numbers of the liquid inlet chambers 313 , the plunger chambers 310 and the liquid outlet chambers 314 can also be set according to actual needs to form other numbers of multi-cylinder piston pumps 100 .

In some optional embodiments, a plurality of the liquid inlet cavities 313 are respectively arranged along the axial extension of the plurality of the plunger cavities 310 . The plurality of liquid inlet cavities 313 are respectively arranged to extend along the axial direction of the plurality of plunger cavities 310, so that the extending directions of the liquid inlet cavity 313, the liquid outlet cavity 314 and the plunger cavity 310 can be the same (as shown in the figure). are shown in the vertical direction), which is beneficial to achieve the effect of compact structure.

In some optional embodiments, the pump body structure 31 further includes a confluence chamber 3141, which is provided in the peripheral space of the outlet of the liquid outlet chamber. That is, the confluence cavity is provided on a peripheral plane where the outlet of the liquid outlet cavity is located, and a confluence channel is formed on the peripheral plane. Compared with the one used in the prior art, the process is simpler through the confluence mode of punching holes on the cavity wall of the liquid outlet cavity. The confluence cavity 3141 is communicated with the liquid outlet 312 and the plurality of liquid outlet cavities 314, and is used for converging the liquids in the plurality of liquid outlet cavities 314 and then discharging them from the liquid outlet 312 to improve the water outlet efficiency.

The confluence cavity 3141 is provided with a water collection port 3142 , and the liquid entering the confluence cavity 3141 is discharged from the liquid outlet 312 through the water collection port 3142 . The water collecting port 3142 communicates with the liquid outlet 312 , and can guide the liquid in the confluence chamber 3141 to the liquid outlet 312 . Optionally, in order to save volume, the water collecting port 3142 is located between the liquid inlet chamber 313 and the adjacent liquid outlet chamber 314, and the space between the liquid inlet chamber 313 and the liquid outlet chamber 314 arranged in the same direction is reasonably utilized. The gap space does not need to occupy additional space to achieve the effect of compact structure.

In some optional embodiments, the liquid inlet cavity 313 and the plunger cavity 310 are arranged throughly, so that the liquid inlet cavity 313 and the plunger cavity 310 are arranged in the same direction, which can better achieve a compact structure. Effect. Compared with the separate arrangement of the shunt cavity and the plunger cavity 310 adopted in the prior art, there is no need to perforate the cavity wall between the shunt cavity and the plunger cavity 310, which simplifies the process. In addition, the liquid from the shunt cavity can be Straight into the plunger cavity 310 , reducing the pressure relief phenomenon caused by the bending of the flow channel, and helping to increase the pressure of the liquid. In one embodiment, the shunt cavity 313 and the plunger cavity 310 are arranged concentrically through.

Optionally, the plunger cavity 310 and the liquid outlet cavity 314 are arranged at intervals around a circumference, which can better achieve the effect of compact structure. It should be noted that, the spaced arrangement refers to the arrangement with a certain distance between adjacent cavities. In one embodiment, a plunger chamber 310 is arranged between every two of the liquid outlet chambers 314, so that the water outlet one-way valves are far apart, and the one-way valves will not affect each other due to the water hammer effect. more efficient. Further, the plunger cavity 310 and the liquid outlet cavity 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 the liquid shunt and the confluence can be uniform.

In some optional embodiments, the pump body structure 31 further includes a water inlet pipe 3131, and the water inlet pipe 3131 communicates with the liquid inlet 311 and the plurality of liquid inlet cavities 313 respectively, and is used for connecting the The liquid entered by the liquid inlet 311 is divided into a plurality of the liquid inlet cavities 313 to improve the water inlet efficiency. Optionally, the liquid inlet cavity 313 and the liquid outlet cavity 314 are respectively arranged at intervals around the circumference of the water inlet pipe 3131, which can better achieve the effect of compact structure. The diameter of the water inlet pipe is larger than the diameter of the shunt cavity, so as to provide enough liquid for each shunt cavity and the corresponding plunger cavity 310 as soon as possible.

It can be understood that the water paths of the plurality of liquid outlet chambers 314 are collected into the confluence chamber 3141 . The water channels of the plurality of liquid inlet chambers 313 are collected to the water inlet pipe 3131 . The confluence chamber 3141 may be disposed in a direction surrounding the circumference of the pump body structure 31 . The water inlet pipe 3131 is located in the middle of the space enclosed by the plurality of the liquid inlet cavities 313 . In this embodiment, the middle of the space enclosed by the plurality of liquid inlet cavities 313 is also the middle of the pump body structure 31 , and the confluence cavity 3141 may be an annular cavity located on the periphery of the water inlet pipe 3131 .

In some optional embodiments, the length of the liquid outlet cavity 314 along the axial direction of the pump body structure 31 can be set to be smaller than the sum of the lengths of the liquid inlet cavity 313 and the plunger cavity 310 along the axial direction of the pump body structure 31, so as to realize the structure The effect of compactness and miniaturization. Optionally, the liquid inlet 311 is provided on the 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 to achieve the effect of compact structure and miniaturization.

The pump body assembly 30 may further include a pump cover 38, which is sealedly 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 by 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 portion 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 baffle 381 and the pump cover 38 are enclosed to form the confluence cavity 3141 . The shunt space enclosed between the second baffle 382 and the pump cover 38 is communicated with the water inlet pipe 3131 and the shunt cavity respectively, so that the liquid entering the water inlet pipe 3131 is shunt to a plurality of the shunt cavities through the shunt space Inside. The shunt cavity can slow down the fluid pulsation and can be used as an auxiliary water tank, which is beneficial to improve the precision and uniformity of spraying control. Optionally, grooves 383 may be formed on the top surfaces of the first baffle 381 and the second baffle 382 respectively, and sealing strips may be arranged in the grooves 383 to improve the sealing between the pump cover 38 and the pump body structure 31 .

9a to 9c, in some optional embodiments, the plunger cavity 310 and the adjacent liquid outlet cavities 314 communicate with each other in pairs, so that each liquid inlet cavity 313, The plunger cavity 310 and the liquid outlet cavity 314 communicate with each other to form a flow channel 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 turning channels 39 corresponding to the number of the plunger cavity 310 . Between the adjacent liquid outlet cavities 314 is a transfer cavity flow channel 39 for connecting the plunger cavity 310 and the liquid outlet cavity 314 . Optionally, since it is difficult to process from the inside of the pump body structure 31, the cavity-turning flow channel 39 for connecting the plunger cavity 310 and the liquid outlet cavity 314 with each other, the cavity-turning flow channel 39 extends to and penetrates the A plug 391 is provided on the outer side wall of one of the plunger cavity 310 or the liquid outlet cavity 314 , and the outer wall of the turning cavity flow channel 39 penetrates through the plunger cavity 310 or the liquid outlet cavity 314 to facilitate The cavity-turning flow channel 39 is obtained by processing.

Referring to FIG. 10 to FIG. 18 , in some optional embodiments, the plunger pump 100 further includes

seals

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

Wherein, the

seals

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

members

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

members

61 and 62 include:

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

The first sealing portion 64 extends from the first side surface of the annular body portion 63 in a direction away from the first side, and is disposed adjacent to the inner side of the annular body portion 63 . The first sealing portion 64 abuts against the plunger structure 32 .

The second sealing portion 65 extends from the first side surface of the annular body portion 63 in a direction away from the first side, and is disposed adjacent to the outer side of the annular body portion 63 .

Wherein, the first sealing part 64 and the second sealing part 65 are spaced apart to form a notch 60 on the first side of the annular body part 63 , and the first sealing part 64 and the second sealing part The portion 65 is arranged in an asymmetric structure.

Through the above arrangement, the first sealing portion 64 and the second sealing portion 65 of the sealing

members

61 and 62 are arranged in an asymmetric structure, so that the sealing effect and wear resistance of the sealing

members

61 and 62 can be improved.

In some optional embodiments, at least one of the shape and size of the first sealing portion 64 and the second sealing portion 65 is different. The pressures received by the first sealing part 64 and the second sealing part 65 can be made different, and the sealing effect and wear resistance of the sealing

members

61 and 62 can be improved.

At least one of the shape and size of the first sealing portion 64 and the second sealing portion 65 is different, which may mean that the height of the first sealing portion 64 and the height of the second sealing portion 65 are different. same. In this embodiment, the height of the first sealing portion 64 is smaller than the height of the second sealing portion 65 . Through the above arrangement, the inner rings of the sealing

members

61 and 62 are shorter than the outer rings, which can ensure that the liquid to be blocked is filled with the sealing

members

61 and 62 to form a tensioning effect on the second sealing part 65, so that the sealing

members

61 and 62 can be tightened. 62 is under tension from the inside out to improve the sealing effect.

At least one of the shape and size of the first sealing portion 64 and the second sealing portion 65 is different, which may refer to the thickness of the first sealing portion 64 and the thickness of the second sealing portion 65 Not the same. In this embodiment, the thickness of the first sealing portion 64 is greater than the thickness of the second sealing portion 65 . Through the above arrangement, the lip formed by the first sealing parts 64 of the

seals

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

parts

61 and 62 can be understood as an outer ring Ring lips. Among them, the inner ring lip is thicker, which can increase the wear resistance of the

seals

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

seals

61 and 62 . Thus, the sealing effect and wear resistance of the sealing

members

61 and 62 are improved.

In some optional embodiments, the first seal portion 64 includes a first seal lip 641 and a second seal adjacent to the first seal lip 641 in the axial direction of the annular body portion 63 The lip 642 , the first sealing lip 641 and the second sealing lip 642 are all inclined relative to the axial direction of the annular body portion 63 , and the first sealing lip 641 is opposite to the annular body portion The included angle of the axial direction of 63 and the included angle of the axial direction of the second sealing lip 642 relative to the annular body portion 63 are different. With the above arrangement, the angles of the first sealing lip 641 and the second sealing lip 642 of the first sealing portion 64 are also asymmetric, which can improve the sealing effect and wear resistance of the sealing

members

61 and 62 . In this embodiment, the first sealing lip 641 is located on the side away from the annular body portion 63 along the axial direction of the annular body portion 63 , and the first sealing lip 641 is opposite to the annular body portion The axial included angle of 63 is greater than the axial included angle of the second sealing lip 642 relative to the annular body portion 63 . It can be understood that the first sealing lip 641 on the side away from the annular body portion 63 is the side that is in contact with the liquid to be blocked, which can be referred to as the liquid side. The second sealing lip 642 on the side close to the annular body portion 63 is in contact with the air and may be referred to as the air side. The axial included angle of the first sealing lip 641 relative to the annular body portion 63 is greater than the axial included angle of the second sealing lip 642 relative to the annular body portion 63, that is, the angle on the liquid side is steeper, which can increase the pressure gradient, Reduce fluid leakage. The angle of the air side is gentler and the pressure gradient is relatively lower, which is beneficial to the suction of the liquid film formed on the surfaces of the

seals

61 and 62 , thereby improving the sealing effect of the

seals

61 and 62 .

In some optional embodiments, both the inner side wall and the outer side wall of the annular body portion 63 are inclined relative to the axial direction of the annular body portion 63 , and the inner side wall of the annular body portion 63 is relative to the annular body portion 63 . The axial included angle of the portion 63 is different from the axial included angle of the outer side wall of the annular body portion 63 relative to the annular body portion 63 . The sealing effect and wear resistance of the

seals

61 and 62 are improved. In this embodiment, the angle between the inner side wall of the annular body portion 63 and the axial direction of the annular body portion 63 is smaller than the angle between the outer side wall of the annular body portion 63 and the axial direction of the annular body portion 63 . horn. That is, the angle of the air in the annular body portion 63 is gentler and the pressure gradient is relatively lower, which is conducive to the suction of the liquid film formed on the surfaces of the

seals

61 and 62 , thereby improving the sealing effect of the

seals

61 and 62 .

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

members

61 and 62, and can increase the suction effect. In addition, when the liquid overflows from the position of the sealing

members

61 and 62, the chamfered portion 66 can also play a role of containing the seeping liquid and preventing the increase of back pressure.

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

members

61 and 62 . Further, a side of the first sealing portion 64 close to the plunger structure 32 and a side of the annular body portion 63 close to the plunger pump 100 are jointly formed with a multi-layer sealing lip 643, which can improve the sealing performance. The sealing effect of the

parts

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

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

members

61 and 62. Further, the inner side wall of the recess 60 is provided with an elastic ring 68, which can increase the holding force of the annular body portion 63 toward the plunger cavity 310, thereby increasing the sealing effect.

In some optional embodiments, the

seals

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

seals

61 and 62 . Optionally, the number of the

seals

61 and 62 is two, and the two seals include the first seal 61 (water seal) located between the plunger structure 32 and the plunger cavity 310 in the pump body structure 31 As for the second seal 62 (oil seal) located between the plunger structure 32 and the plunger cavity 310 in the plunger base 34, the material of the first seal 61 can be fluorine rubber with good corrosion resistance. In order to improve the wear resistance, wear-resistant agents such as cloth can also be added to it. The material of the second sealing member 62 can be nitrile rubber or polyurethane with good oil resistance and wear resistance. It can be understood that, in some embodiments, the number of the sealing

members

61 and 62 is at least two, for example, three, four, and five, which are not limited in this application.

The

seals

61, 62 and the plunger structure 32 may be worn out after long-term use, resulting in seal failure and liquid seepage. Referring to FIG. 11 , FIG. 12 , FIG. 14 and FIG. 15 , in some optional embodiments, in order to prevent the exuded liquid from holding back pressure and backflow or mutual channeling, or in the pump body structure 31 of the plunger pump 100 The fluid overflows into the seal chamber located below and affects the lubricant. The two

seals

61 and 62 are arranged in the middle of the

plunger cavity

310 and 310 , and the two

seals

61 and 62 are relatively spaced apart. The plunger structure 32 is sealed with the two

seals

61 and 62 It cooperates to prevent the liquid from flowing out of the gap between the

seals

61 and 62 and the inner wall of the plunger cavity 310310 or/and the plunger structure 32 . It can be understood that the liquid can pass through 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 The gap of the position flows out. Wherein, the plunger cavity 310 is provided with an overflow hole located between the two

seals

61 , 62 , and the liquid flowing between the two

seals

61 , 62 can pass through the overflow hole outflow.

Through the above arrangement, by arranging an overflow hole between the two

seals

61 and 62, the liquid flowing between the two

seals

61 and 62 can flow out through the overflow hole to avoid lubricants The leakage flows into the pump body structure or prevents the liquid in the pump body structure 31 from leaking into the sealed cavity of the transmission device 20 .

In some optional embodiments, the two

seals

61 and 62 divide the plunger cavity 310 into an escape cavity 691 , an overflow cavity 92 and a pumping cavity 693 , the escape cavity 691 and the pump The extraction cavities 693 are respectively located at two ends of the cavity of the plunger cavity 310 , and the overflow cavity 92 is located in the middle of the cavity of the plunger cavity 310 . It can be understood that the avoidance cavity 691 is formed in the space between the notches 60 of the

seals

61 and 62 and the plunger base 34 , and the pumping cavity 693 is formed in the notches 60 of the

seals

61 and 62 and the pump body. The space between the structures 31 , the overflow cavity 92 is formed in the space between the plunger base 34 and the pump body structure 31 . Wherein, the escape cavity 691 accommodates lubricant, and the seal (ie, the second seal 62 ) close to the escape cavity 691 is used to prevent the lubricant from flowing into the overflow cavity 92 . The pumping chamber 693 accommodates the liquid medicine, and the sealing member (ie, the first sealing member 61 ) close to the pumping chamber 693 is used to prevent the liquid medicine from flowing into the overflow chamber 92 , thereby avoiding lubrication The material leaks into the plunger cavity 310 or the liquid in the pump body structure 31 leaks into the sealing cavity. It can be understood that the first sealing member 61 is disposed close to the pumping cavity 693 , and the second sealing member 62 is disposed close to the avoidance cavity 691 .

In some optional embodiments, the plunger pump 100 further includes a guide block 345 , the guide block 345 is provided between the first seal 61 and the second seal 62 , and the plunger structure 32 It passes 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 achieved by the first sealing member 61 , the sealing between the plunger structure 32 and the plunger base 34 is achieved by the second sealing member 62 , Both the first sealing member 61 and the second sealing member 62 are sleeved on the plunger structure 32, and the two are separated from each other by the guide block 345 and pressed tightly, so that the first sealing member 61 and the second sealing member 62 can be compressed. For the purpose of fixing, the guide sleeve 342 can also be combined to provide a guiding function for the plunger structure 32, so that the plunger structure 32 becomes a simply supported structure, which reduces shaking, thereby avoiding the first sealing member 61 and the second sealing member 62. The non-concentricity with the plunger structure 32 caused by the shaking causes the seal to fail, and a three-layer dynamic seal is formed, which can improve the sealing effect. Optionally, the guide blocks 345 include plastic guide blocks or soft metal guide blocks. That is, the material of the guide block 345 can be soft metal such as wear-resistant plastic or copper alloy, so as to reduce the wear between the guide block 345 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 member 61, and the The second pressing portion 3452 is close to the second sealing member 62 to achieve a fixing function of the first sealing member 61 and the second sealing member 62 . In this embodiment, the guide block 345 has a stepped structure, the first pressing portion 3451 abuts against the inner wall of the first sealing member 61 and tightly fits with the pump body structure 31, and the second pressing portion 3452 abuts against The outer wall of the second sealing member 62 is closely matched with the plunger base 34 to ensure the concentricity among the plunger base 34 , the pump body structure 31 and the plunger structure 32 , thereby improving the sealing effect.

The plunger pump 100 further includes a pump body structure 31 and a plunger base 34 connected to the pump body structure 31 . The outer side of the guide block 345 is provided with a first stepped annular surface and a second stepped annular surface. The first stepped annular surface cooperates with the plunger base 34 , and the second stepped annular surface cooperates with the pump body structure 32 to ensure the concentricity of the plunger base 34 and the pump body structure 31 . Optionally, the inner annular surface of the guide block 345 cooperates with the plunger structure 32 to ensure the concentricity of the plunger base 34 , the pump body structure 31 and the plunger structure 32 .

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

In some optional embodiments, the inner wall portion of the plunger cavity 310 located in the pump body structure 31 is provided with a first receiving groove in the axial direction, and one of the two seals is close to the pump body structure 31 One of them (ie, the first sealing member 61 ) is disposed in the first receiving groove. It can be understood that the bottom surface of the pump body structure 31 is provided with the first receiving groove, and the first sealing member 61 located between the plunger structure 32 and the plunger cavity 310 in the pump body structure 31 is provided in the first receiving groove in the slot. The inner wall portion of the plunger cavity 310 located in the plunger base 34 is axially provided with a second receiving groove, and one of the two seals close to the plunger base 34 (ie, the second seal 62) is arranged in the second receiving groove. It can be understood that the top end of the inner wall of the guide hole 341 of the plunger base 34 is provided with the second receiving groove, and the second seal 62 between the plunger structure 32 and the plunger cavity 310 in the plunger base 34 is provided in the in the second receiving slot. In this embodiment, the first pressing portion 3451 abuts against the inner wall of the first sealing member 61 and tightly fits with the first receiving groove of the pump body structure 31 , and the second pressing portion 3452 abuts against the second sealing member 62 The outer wall of the plunger base 34 is closely matched with the second receiving groove of the plunger base 34 to ensure the concentricity between the plunger base 34, the pump body structure 31 and the plunger structure 32, thereby improving the sealing effect.

Optionally, both the first receiving groove and the second receiving groove have a stepped structure, and the structures of the first sealing member 61 and the second sealing member 62 are adapted to the stepped structure. The first sealing member 61 and the second sealing member 62 are embedded in the corresponding stepped structure, and the stepped structure can limit the position of the first sealing member 61 and the second sealing member 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 facilitate the introduction of liquid into the notch 60 of the seal Inside, it is used to form a tensioning effect on the second sealing part 65 of the sealing element, so that the sealing element is subjected to a tension force from the inside to the outside, thereby improving the sealing effect.

In order to achieve a better sealing effect, a fifth sealing member 346 may be provided on the rotating shaft 121 of the motor 12 . A sixth sealing member 347 may be arranged between the motor housing 11 and the oil storage housing. The motor housing 11 , the fourth sealing member 346 and the fifth sealing member 347 can fully seal the motor 12 and achieve a better sealing effect.

In some optional embodiments, the overflow hole includes a first overflow hole 611 and a second overflow hole 621, and the first overflow hole 611 is provided in the two seals close to the pump The space formed between one of the body structures 31 and the guide block 345 , that is, the space formed between the first seal 61 and the guide block 345 , so that the liquid that will flow into the space can pass through the first overflow hole 611 outflow. The second overflow hole 621 is provided in the space formed between one of the two seals near the plunger base 34 and the guide block 345 , that is, between the second seal 62 and the guide block 345 . A space is formed, so that the liquid flowing into the space can flow out through the second overflow hole 621 . Optionally, the first overflow hole 611 is provided on the air side of the first sealing member 61 . The second overflow hole 621 is provided on the air side of the second seal 62 . The diameter of the first overflow hole 611 is larger than that of the second overflow hole 621 . Since the amount of the lubricant seeping out is relatively small, and its destructiveness is relatively weak, the aperture of the overflow hole of the second seal 62 is set to be relatively small. Since the seepage amount of the chemical liquid is relatively large and the corrosiveness is very strong, the overflow hole of the first sealing member 61 is relatively large.

It can be understood that a part of the plunger cavity 310 is located in the pump body structure 31 , and the other part is located in the plunger base 34 . The pump body structure 31 includes a bottom surface, and the bottom surface is provided with an opening communicating with the plunger cavity 310 , and the opening corresponds to the position of the guide hole 341 and the guide sleeve 342 of the plunger base 34 . The bottom surface is provided with an overflow groove 36 for discharging the liquid overflowing from the plunger cavity 310 out of the plunger cavity 310 .

The overflow grooves 36 respectively extend from the middle of the bottom surface of the pump body structure 31 to the plunger cavity 310, so as to discharge the liquid overflowing from the plunger cavity 310 out of the plunger cavity 310, which can be stored in the pump body. The middle part of the structure 31 collects the overflowing liquid and then discharges it. Optionally, the overflow groove 36 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 plunger cavity 310 .

In this embodiment, the first sealing member 61 is provided with a first overflow hole 611 at the slot position of the plunger cavity 310 facing the overflow groove 36 so as to overflow the plunger cavity 310 The liquid is discharged from the plunger cavity 310 through the first overflow hole 611 . In this embodiment, the overflow groove 36 is located in the middle of the bottom surface of the pump body structure 31 , 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 communicate with the overflow groove 36 . The liquid overflowing from the plunger cavity 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 sealing member 61 may also be provided with a first overflow hole 611 that is not communicated with the overflow groove 36 , and the liquid overflowing from the plunger cavity 310 may be directly discharged from the first overflow hole 611 to the outside of the pump body structure 31 . Setting the overflow groove 36 on the pump body structure 31 and setting the overflow hole on the first sealing member 61 can prevent the liquid from flowing down and corrode the ESC 13 on the one hand, and also facilitate the discharge of the pump body structure 31 on the other hand. liquid for recycling. The side wall of the plunger base 34 is provided with a guide groove 622 , and the second overflow hole 621 communicates with the guide groove 622 . The liquid overflowing from the plunger cavity 310 can flow into the guide groove 622 through the second overflow hole 621 , and then the guide groove 622 is discharged out of the plunger base 34 . It can be understood that the first overflow hole 611 and the second overflow hole 621 can be configured to discharge the overflowing lubricant (such as lubricating oil) or liquid medicine (or water) out of the plunger pump, therefore, the first overflow hole The arrangement of the flow hole 611 and the second overflow hole 621 can be changed according to the arrangement of the

seals

61 , 62 and the pump body structure 31 , etc., which is not limited in this application.

In order to achieve a better overflow effect, the bottom surface of the pump body structure 31 further includes a liquid storage tank 37 , and the liquid storage tank 37 communicates with the overflow tank 36 . When a large amount of liquid overflows from the plunger cavity 310 , a part of the liquid is discharged out of the pump body structure 31 from the overflow groove 36 and the first overflow hole 611 of the first seal 61 . Another part of the liquid can first flow into the liquid storage tank 37 for temporary storage. 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 drains out of the pump body structure 31 . Optionally, the liquid storage tank 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 to the outside of the pump body structure 31, which can improve the overflow efficiency. The liquid storage tank 37 can also play a role in reducing weight. In the example shown in the figure, it is shown that the overflow groove 36 communicates with a liquid storage groove 37 and extends 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 at the bottom of the figure is in communication with the overflow tank 36. It is understood that the other two liquid storage tanks 37 can also be connected with the overflow tank 36 (not shown in the figure). ), which is not limited in this application.

Since the first sealing member 61 is easily worn and corroded, there is a need for quick release and replacement. The pump body structure 31 and the plunger base 34 can be detachably connected by fasteners such as screws 344, and the pump body structure 31 and the plunger base 34 can be disassembled from each other by removing the fasteners, so as to replace the first seal 61. In order to avoid lubricant leakage caused by opening the transmission case 22 when the first seal 61 is replaced, the fasteners connecting the oil storage housing of the transmission case 22 and the plunger base 34 can be embedded in the projection of the pump body structure 31 In order to achieve the purpose of preventing the transmission box 22 from being easily disassembled after the pump body structure 31 is removed, and the fasteners can use a special screw head type to match the special nature of the connecting part 3441, such as oval, to prevent the transmission box. 22 is easily disassembled.

Referring to Fig. 5 and Fig. 16a, in some optional embodiments, in addition to the measures to prevent the chemical liquid from entering the transmission case 22 to cause lubrication failure, the transmission case 22 itself also takes some wear-resistant measures. The transmission cavity 221 is provided with lubricant. The transmission structure is accommodated in the cavity of the transmission cavity 221 . The plunger cavity 310 communicates with the transmission cavity 221 . The plunger structure 32 is at least partially accommodated in 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 with the transmission cavity 221 . Wherein, the magnetic component 40 can absorb the solid particles in the lubricant (for example, iron filings generated between the plunger structure and the transmission structure due to wear).

Through the above arrangement, the magnetic component 40 can collect the iron scraps generated between the plunger structure 32 and the transmission structure due to wear, so as to prevent the contamination of the lubricant and affect the lubrication effect.

In some optional embodiments, the magnetic component 40 is provided inside or outside the transmission cavity 221 . When the magnetic component 40 is disposed outside the transmission cavity 221 , the magnetic field generated by the magnetic component 40 can pass through the inner wall of the transmission cavity 221 , so as to cause wear between the plunger structure 32 and the transmission structure. iron filings are collected.

In some optional embodiments, the side wall of the transmission cavity 221 is provided with a liquid guide hole, and the magnetic component 40 is provided in the transmission cavity 221 at a position corresponding to the liquid guide hole. The lubricant can be changed periodically through the drain hole. The magnetic component 40 can collect the iron filings generated between the plunger structure 32 and the thrust bearing 212 of the transmission structure due to wear through the liquid guide hole. Further, the plunger pump 100 further includes a sealing plug 41 for sealing the liquid guide hole, the magnetic component 40 is mechanically coupled with the sealing plug 41, and the sealing plug 41 is located at the position of the liquid guide hole It is detachably connected to the transmission cavity 221, so that the magnetic component 40 can be arranged at the position of the liquid guide hole. A sealing ring 411 may be provided between the sealing plug 41 and the liquid guide hole.

In some optional embodiments, the position where the liquid guide hole is opened in the transmission cavity 221 corresponds to the contact position between the transmission structure and the thrust bearing 212 of the plunger structure 32 . In this way, the magnetic component 40 can be arranged near the wear surface of the plunger structure 32 and the thrust bearing 212 to improve the collection effect of iron filings.

The magnetic component 40 includes a chip suction magnet 42 and a chip storage groove 43 disposed at the liquid guide hole, and the chip storage groove 43 is adjacent to the chip suction magnet 42 . The iron chips generated by the wear between the plunger structure 32 and the transmission structure 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 as to be collected in the chip storage groove. 43, replace and clean the chip storage groove 43, and the next collection can be carried out to prevent the iron chips from contaminating the lubricating oil and affecting the lubricating effect.

In some optional 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 disposed in the transmission cavity 221 along the tangential direction of the rotation direction of the transmission structure. The magnetic components 40 are arranged near the wear surfaces of the plunger structure 32 and the thrust bearing 212, and are arranged along the tangential direction of the iron filings, which can improve the collection effect.

As described above, in some embodiments, since the thrust bearing 212 is provided on the upper surface of the swash plate 211 , when the swash plate 211 is inverted, the thrust bearing 212 will fall out. In order to avoid the above situation, the plunger base 34 and the oil storage housing can be detachably connected by fasteners such as screws 344 . The oil storage housing can be fixedly connected to the motor base 14 , or can be integrally formed with the motor base 14 . In other embodiments, due to the arrangement of the liquid guide hole, the oil storage housing (transmission cavity 221 ) can be fixedly connected to the motor base 14 or the pump body structure 31 or the plunger base 34 It can also be integrally formed with the pump body structure 31 or the upper 34 of the plunger base. This is because lubricant (eg lubricating oil) can be injected into the oil storage housing (transmission cavity 221 ) through the liquid guide hole, without worrying that the swash plate 211 will be inverted and the thrust bearing 212 will fall out.

16b to 16d and as shown in FIGS. 17 and 18, in some optional embodiments, in order to prevent the plunger pump 100 from being damaged due to excessive pressure in the pump body structure 31, the plunger pump 100 may include: Overvoltage protection structure 50 . The pump body structure 31 is provided with a liquid inlet chamber 313 and a liquid outlet chamber 314 . The overvoltage protection structure 50 is mechanically coupled with the pump body structure 31 , and the overvoltage protection structure 50 is provided with a return channel, and the return channel can be changed between an open state and a closed state. Among them, as shown in FIG. 17 , the return channel is in a closed state. As shown in FIG. 18 , when the return channel is in an open state, the liquid in the pump body structure 31 can return from the liquid outlet chamber 314 to the liquid inlet chamber 313 , and the return channel is shown in FIG. 18 . shown in the direction of the arrow.

Through the above arrangement, when the pressure in the liquid outlet chamber 314 is too large, the return passage can be switched to an open state, so that the liquid in the pump body structure 31 can be returned from the liquid outlet chamber 314 to the The liquid inlet chamber 313 is described, thereby releasing the pressure in the liquid chamber 314 .

In some optional embodiments, the overpressure protection structure 50 includes a sliding cavity 51 communicating with the liquid outlet cavity 314 and a sliding block 52 movably disposed in the sliding cavity 51 , and the sliding cavity 51 forms at least part of the return channel. When the slider 52 moves to the first position, the return channel is in a closed state, as shown in FIG. 17 . When the slider 52 moves to the second position, the return channel is in an open state, as shown in FIG. 18 .

In some optional embodiments, the overpressure protection structure 50 further includes a base 53 connected to the pump body structure 31 , the base 53 is formed with the sliding cavity 51 , and the sliding cavity 51 is provided with A guide hole communicated with the liquid outlet cavity 314 . Optionally, the base 53 of the overpressure protection structure 50 can be connected to the pump cover 38 of the pump body assembly 30, and the pump cover 38 is provided with a connection hole that is butted with the guide hole, so that the sliding cavity 51 and the liquid outlet cavity 314 are connected. Connected.

As shown in FIG. 17 , when the slider 52 is in the first position, the slider 52 abuts on the base 53 and blocks the guide hole, so that the return channel is in a closed state. As shown in FIG. 18 , when the sliding block 52 is in the second position, the sliding block 52 is separated from the base 53 to leave the guide hole, so that the return channel is in an open state. In this embodiment, the overvoltage protection structure 50 may adopt a valve body structure. The slider 52 can be understood as the valve core of the valve body structure, and the base 53 can be understood as the valve seat of the valve body structure. As shown in FIG. 17 , when the slider 52 is in the first position, the valve core and the valve seat are butted against 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 core 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 chamber 314 of the plunger pump 100 is too large, the valve core can be pushed open to separate the valve core from the valve seat, so that the return channel is in an open state. Optionally, a sealing gasket 58 is provided between the sliding block 52 and the base 53 , and when the return 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 return channel includes a return hole 54 communicating with the sliding cavity 51 , and the return hole 54 is provided in the liquid inlet cavity 313 . When the pressure in the liquid outlet chamber 314 of the plunger pump 100 is too large, the valve core can be pushed open to separate the valve core from the valve seat, so that 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 since there is no pressure in the liquid inlet chamber 313 , the pressure in the liquid outlet chamber 314 is released. Optionally, the liquid inlet chamber 313 includes a liquid inlet port 311 , and the return hole 54 is provided at the liquid inlet port 311 .

In some optional embodiments, in order to prevent the back pressure of the slider 52 from being generated, the slider 52 is prevented from sliding and cannot be separated from the base 53, and the return channel cannot be opened. The sliding chamber 51 is provided with a balance hole 55 that communicates with the liquid inlet chamber 313. By setting the balance hole 55 on the back flow channel of the slider 52, since there is no pressure in the liquid inlet chamber 313, the balance hole 55 is connected to the liquid inlet. The communication of the cavity 313 can balance the pressure on both sides of the sliding block 52, so that the sliding block 52 can slide smoothly when the pressure in the liquid outlet cavity 314 is too large.

In some optional embodiments, the overvoltage protection structure 50 further includes an elastic member 56 disposed in the sliding cavity 51 , and a first end of the elastic member 56 abuts against the bottom of the sliding cavity 51 . , the second end of the elastic member 56 is connected with the slider 52 . The elastic member 56 is used to provide the sliding block 52 with a force in the direction of the guide hole. When the pressure in the liquid outlet chamber 314 of the plunger pump 100 is too large, the valve core can be pushed open to separate the valve core from the valve seat, so that the return channel is in an open state. After the pressure in the liquid outlet chamber 314 is released, the slider 52 can move toward the guide hole under the elastic force of the elastic member 56 until it abuts on the base 53 and blocks the guide hole, so that the The return channel is closed again.

The overvoltage protection structure 50 further includes a pressure regulating member 57 for adjusting the pre-tightening force of the elastic member 56 , and the pressure regulating member 57 is connected with the second end of the elastic member 56 . The pre-tightening force of the elastic member 56 can be set according to the preset pressure requirement in the liquid outlet chamber 314 . It can be understood that the opening pressure of the return passage is related to the preload force of the elastic member 56 , and the preload force of the elastic member 56 can be changed by adjusting the pressure regulating member 57 , thereby adjusting the opening pressure of the ejection slider 52 . Optionally, the pressure regulating member 57 includes a pressure regulating screw, and the end of the sliding cavity 51 away from the guide hole is connected to the elastic member 56 . A sealing ring 59 may be provided between the pressure regulating member 57 and the elastic member 56 to improve the sealing performance between the two.

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 chamber 314 is less than a preset value, and the return channel is in a closed state. It can be understood that the preset value is set according to the pressure preset value requirement in the liquid outlet chamber 314 , and accordingly, the preload force of the elastic member 56 is adjusted to a value equal to the preset value.

In some optional embodiments, the overpressure protection structure 50 further includes a pressure detection part disposed in the liquid outlet chamber 314 for detecting the pressure in the liquid outlet chamber 314 . Optionally, the pressure detection part includes a pressure sensor, which can be used to detect the pressure value in the liquid chamber 314 . The pressure detection part includes a pressure detection hole 591 provided in the liquid outlet chamber 314 and communicated with the return channel. When the pressure in the liquid outlet chamber 314 of the plunger pump 100 is too large, the valve core can be pushed open to separate the valve core from the valve seat, so that the return channel is in an open state. The pressure sensor detects the maximum pressure threshold in the liquid chamber 314, so that the pre-tightening force of the elastic member 56 can be adjusted according to the measured value. When the pressure in the liquid outlet chamber 314 reaches the maximum pressure threshold, the return channel can be opened to The effectiveness of the overvoltage protection structure 50 is guaranteed. Optionally, the liquid outlet chamber 314 includes a liquid outlet port 312 , and the pressure detection hole 591 is provided at the liquid outlet port 312 .

Since the load of the plunger pump 100 is positively related to the system pressure, in order to prevent the pressure in the liquid outlet chamber 314 of the plunger pump 100 from becoming too large, the embodiment of the present application further provides an overpressure protection method for the plunger pump 100 . The plunger pump 100 includes 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, and the plunger structure 32 is at least partially accommodated in the pump The plunger pump 100 sucks the liquid into the liquid inlet chamber 313 and squeezes the liquid out of the liquid outlet chamber 314 , and can reciprocate in the pump body structure 31 . Referring to Figure 19, the overvoltage protection method includes:

Step S1 : Determine the pressure information in the liquid outlet chamber 314 .

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

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

In some optional embodiments, the plunger pump 100 further includes a motor 12 for driving the plunger structure 32 to reciprocate. In the above step S2, the reducing the reciprocating motion of the plunger structure 32 The speed includes: reducing the running speed of the motor 12 to reduce the reciprocating speed of the plunger structure 32 .

Optionally, the plunger pump 100 further includes 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 running speed of the motor 12 to reduce the reciprocating speed of the plunger structure 32 includes: reducing the running speed of the motor 12 to reduce the rotation speed of the transmission structure, thereby reducing the plunger Speed of reciprocation of 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, and drives the thrust bearing 212 to rotate, and the thrust bearing 212 pushes the plunger structure 32 to reciprocate.

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

Step S11 : Detect the current information of the motor 12 .

Step S12: Determine the pressure information in the liquid outlet chamber 314 according to the current information.

Further, when the pressure information exceeds a first preset value, reducing the reciprocating speed of the plunger structure 32 includes: when the current information exceeds a preset current value, reducing the speed of the motor 12 running speed. It can be understood that since the load of the plunger pump 100 is positively related to 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, It is embedded in the program, and the magnitude of the pressure information is indirectly detected by detecting the current of the motor 12 . When the current information exceeds the preset current value, the rotation speed of the motor 12 is reduced through a program until the current of the motor 12 returns to a normal level.

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

Step S13 : Detecting the pressure value in the liquid outlet chamber 314 .

Step S14: Determine the pressure information in the liquid outlet chamber 314 according to the pressure value.

It can be understood that, in addition to detecting the current of the motor 12 to indirectly detect the magnitude of the pressure information, a pressure gauge can also be provided in the liquid outlet chamber 314 to directly detect the pressure value in the liquid chamber 314 to obtain the pressure information.

In some optional embodiments, in the above step S2, when the pressure information exceeds the first preset value, it may further include the step of: issuing an alarm signal to remind the user that the pressure in the liquid outlet chamber 314 is too large, thereby Detect malfunctions in the sprinkler system.

In some optional embodiments, the plunger pump 100 further includes the above-mentioned overpressure protection structure 50, which is mechanically coupled with the pump body structure 31, and the overpressure protection structure 50 is provided with a return channel, the return flow Channels can transition between open and closed states. When the return channel is in an open state, the liquid can return from the liquid outlet chamber 314 to the liquid inlet chamber 313 . The method further includes: when the pressure information exceeds a second preset value, opening the return passage. It can be understood that since the overpressure protection structure 50 will reduce the volumetric efficiency of the plunger pump 100 when the pressure is released, the overpressure protection structure 50 can be used as an alternative safeguard measure, and a software-controlled protection method is preferred to achieve overpressure protection. , the overvoltage protection structure 50 can be activated only when the protection mode controlled by the software 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 1 MPa, the first preset value corresponding to the software-controlled protection mode is set to 1.25 MPa, 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 chamber 314 exceeds 1.25MPa, the software-controlled protection method is preferentially adopted. When the protection mode controlled by the software fails, when the detected pressure in the liquid outlet chamber 314 continues to rise to more than 1.5MPa, the protection mode of the overpressure protection structure 50 can be triggered, that is, the pressure in the liquid outlet chamber 314 is too high. When it is large, the sliding block 52 can be pushed open, so that the return channel is in an open state.

In some optional embodiments, the overvoltage protection structure 50 further includes a slider 52 disposed in the return channel and an elastic member 56 for driving the slider 52 to move in the return channel, When the slider 52 moves to the first position, the return channel is in a closed state. When the slider 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 preload force of the elastic member 56 . It can be understood that the pre-tightening force of the elastic member 56 can be set according to the preset pressure requirement in the liquid outlet chamber 314 . The opening pressure of the return passage is related to the preloading force of the elastic member 56, and the preloading force of the elastic member 56 can be changed by adjusting the pressure regulating member 57, so as to adjust the opening pressure of the ejecting slider 52.

The plunger pump provided by the embodiment of the present application has beneficial effects such as light and compact high pressure and large flow, can replace the traditional low pressure and small flow diaphragm pump or peristaltic pump, and can be applied to fields such as spraying systems or plant protection drones. Increase spray flow and pressure, enhance droplet penetration, and achieve variable spraying. The above-mentioned compact and weight-saving design of the flow channel structure of the plunger pump can reduce the volume and weight. Through the above-mentioned sealing member and the overflow scheme, the corrosion resistance, sealing reliability and wear resistance of the plunger pump can be improved. In addition, in the embodiment of the present invention, by adopting the plunger pump structure, the compression ratio of the plunger cavity 310 is small, which improves the self-priming and exhausting capacity; and the flow rate is basically proportional to the rotational speed, and the flow loss after wear is small.

Embodiments of the present application also provide a spray system, including a plunger pump 100 and at least one spray head 92 connected to the plunger pump 100 . The plunger pump 100 can be connected to an external box, and the box can hold liquids such as liquid medicine. The plunger pump 100 can suck the liquid in the tank and pump it out, and then spray it through the spray head 92 . It should be noted that, the descriptions about the plunger pump 100 in the above embodiments and implementation manners are also applicable to the spraying system of the present application.

Referring to FIG. 22 , an embodiment of the present application further provides a plant protection drone 200 , which includes a fuselage 91 and at least one plunger pump 100 mounted on the fuselage 91 . The body 91 can be installed with a box for holding liquids such as liquid medicine, and at least one spray head 92 can be connected to a plunger pump 100 . The plunger pump 100 can be connected to an external tank, and the plunger pump 100 can suck the liquid in the tank and pump it out, and then spray it through the spray head 92 . It should be noted that, the descriptions about the plunger pump 100 in the above embodiments and implementation manners are also applicable to the plant protection drone 200 of the present application.

Referring to FIG. 5 and FIG. 22 , in some optional embodiments, the plant protection drone 200 further includes a plurality of arms and a mounting bracket mounted on the fuselage 91 , and at least one spray head 92 can be mounted on one arm. The plunger pump 100 is mounted on the mounting bracket so as to be mounted on the body 91 . In order to improve the precision and controllability of spraying, the plant protection drone 200 also includes a flow meter 90 and a solenoid valve. The flow meter 90 is connected to the plunger pump 100 for detecting the flow signal. The flowmeter 90 can be an electromagnetic flowmeter 90 with higher precision. In this embodiment, one flowmeter 90 may be connected to two plunger pumps 100 . The solenoid valve is connected to the spray head 92 for controlling the opening and closing of the spray head 92 . When the plant protection drone 200 is flying, the vibration of the plunger pump 100 will cause the liquid in the pump body structure 31 to vibrate, and the liquid near the electrodes of the flowmeter 90 will also vibrate accordingly, causing the detection signal of the flowmeter 90 to fluctuate. To slow down the vibration of the plunger pump 100 , a shock-absorbing pad 95 is provided between the mounting bracket and the plunger pump 100 , and the shock-absorbing pad 95 may be a rubber pad. A rotor assembly 96 may also be provided on the arm 93 . A support frame 97 may also be provided at the bottom of the fuselage 91 . In this embodiment, the plant protection drone 200 is a multi-rotor drone, and the number of the arms 93 and the rotor assemblies 96 is six. In other examples, the plant protection drone 200 may also be other numbers of multi-rotor drones.

Embodiments of the present application further provide a spraying device, including a main body and at least one plunger pump, wherein the at least one plunger pump is mounted on the main body. It should be noted that, the descriptions about the plunger pump in the above embodiments and implementation manners are also applicable to the spraying device of this embodiment. Optionally, the spraying equipment includes a plant protection drone, a pesticide spraying vehicle, a human-powered spraying device, a car washer and a pesticide applicator.

It should be noted that, in this document, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any relationship between these entities or operations. any such actual relationship or sequence exists. The terms "comprising", "comprising" or any other variation thereof are intended to encompass non-exclusive inclusion such that a process, method, article or device comprising a list of elements includes not only those elements, but also other not expressly listed elements, or also include elements inherent to such a process, method, article or apparatus. Without further limitation, an element qualified by the phrase "comprising a..." does not preclude the presence of additional identical elements in a process, method, article or apparatus that includes the element.

The pan-tilt handle provided by the embodiments of the present application and the pan-tilt head provided with the pan-tilt handle provided by the embodiments of the present application have been described in detail above. The principles and implementations of the present application are described with specific examples in this paper. The descriptions of the above embodiments are only used to help understanding The method of the present application and its core idea; at the same time, for those skilled in the art, according to the idea of the present application, there will be changes in the specific implementation and application scope. In summary, the content of this specification should not be It is construed as a limitation of this application.

Claims

A plunger pump, characterized in that, comprising:

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

a plunger structure, at least partially accommodated in the plunger cavity, and capable of reciprocating movement in the plunger cavity, sucking liquid from the liquid inlet, and extruding the liquid from the liquid outlet; and

a sealing element, the sealing element is in sealing cooperation with the plunger structure, and the sealing element comprises:

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

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

a second sealing portion, the second sealing portion extends from the first side surface of the annular body portion in a direction away from the first side, and is disposed adjacent to the outer side of the annular body portion;

Wherein, the first sealing part and the second sealing part are spaced apart to form a notch on the first side of the annular body part, and the first sealing part and the second sealing part are arranged asymmetrically structure.
The plunger pump according to claim 1, wherein at least one of a shape and a size of the first sealing portion and the second sealing portion are different from each other.
The plunger pump according to claim 2, wherein the height of the first sealing portion is different from the height of the second sealing portion.
The plunger pump according to claim 3, wherein the height of the first sealing portion is smaller than the height of the second sealing portion.
The plunger pump according to claim 1, wherein the thickness of the first sealing portion is different from the thickness of the second sealing portion.
The plunger pump according to claim 5, wherein the thickness of the first sealing portion is greater than the thickness of the second sealing portion.
The plunger pump according to claim 2, wherein the first sealing portion comprises a first sealing lip and a second sealing lip adjacent to the first sealing lip in the axial direction of the annular body portion Two sealing lips, the first sealing lip and the second sealing lip are inclined relative to the axial direction of the annular body portion, and the first sealing lip is relative to the axial direction of the annular body portion The included angle is different from the included angle of the second sealing lip relative to the axial direction of the annular body portion.
The plunger pump according to claim 7, wherein the first sealing lip is located on a side away from the annular body portion along the axial direction of the annular body portion, and the first sealing lip is opposite to The axial included angle of the annular body portion is greater than the axial included angle of the second sealing lip relative to the annular body portion.
The plunger pump according to claim 2, wherein a side wall of the first sealing portion away from the recess is formed with a multi-layer sealing lip.
The plunger pump according to claim 1, wherein the inner side wall and the outer side wall of the annular body portion are inclined with respect to the axial direction of the annular body portion, and the inner side wall of the annular body portion is relative to the axial direction of the annular body portion. The axial included angle of the annular body portion and the axial included angle of the outer sidewall of the annular body portion relative to the annular body portion are different.
The plunger pump according to claim 10, wherein the included angle between the inner side wall of the annular body portion and the axial direction of the annular body portion is smaller than that of the outer side wall of the annular body portion relative to the annular body portion the axial angle.
The plunger pump according to claim 1, wherein a chamfered portion is formed on a side of the inner side wall of the annular body portion away from the first sealing portion.
The plunger pump according to claim 1, wherein the inner side wall of the annular body portion is provided with a dust ring.
The plunger pump according to claim 1, wherein a side of the first sealing portion close to the plunger structure and a side of the annular body portion close to the plunger structure are jointly formed with multiple layers Seal lip.
The plunger pump according to claim 1, wherein an elastic ring is provided on the inner side wall of the recess.
The plunger pump according to claim 1, wherein the sealing member comprises at least one of a rubber sealing member and a polyurethane sealing member.
A plant protection drone is characterized by comprising a fuselage and at least one plunger pump according to any one of claims 1-16, wherein the at least one plunger pump is mounted on the fuselage.
A plunger pump, characterized in that, comprising:

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

a plunger structure, at least partially accommodated in the plunger cavity, and capable of reciprocating movement in the plunger cavity, sucking liquid from the liquid inlet, and extruding the liquid from the liquid outlet; and

Two seals are arranged in the middle of the plunger cavity, and the two seals are relatively spaced apart, and the plunger structure is in sealing cooperation with the two seals to prevent the liquid from passing The gap between the seal and the inner wall of the plunger cavity or/and the plunger structure flows out,

Wherein, the plunger cavity is provided with an overflow hole located between the two seals, and the liquid flowing between the two seals can flow out through the overflow hole.
The plunger pump according to claim 18, wherein the two seals divide the plunger cavity into an escape cavity, an overflow cavity and a pumping cavity, the escape cavity and the pumping cavity They are respectively located at both ends of the cavity of the plunger cavity, and the overflow cavity is located in the middle of the cavity of the plunger cavity.
The plunger pump according to claim 19, wherein the escape cavity accommodates lubricant, and the seal near the escape cavity is used to prevent the lubricant from flowing into the overflow cavity.
The plunger pump according to claim 19, wherein the pumping cavity accommodates a medicinal liquid, and the seal near the pumping cavity is used to prevent the medicinal liquid from flowing into the overflow cavity.
The plunger pump according to claim 19, wherein the two seals comprise a first seal and a second seal, the first seal is disposed adjacent to the pumping cavity, and the second seal A seal is disposed adjacent to the escape cavity.
The plunger pump according to claim 22, further comprising a guide block disposed between the first seal and the second seal, the plunger structure passing through the guide block and can perform reciprocating motion relative to the guide block.
The plunger pump according to claim 23, wherein the guide block comprises a first pressing part and a second pressing part connected with the first pressing part, and the first pressing part is close to the The first sealing member and the second pressing portion are close to the second sealing member.
The plunger pump according to claim 23, wherein the guide block has a stepped structure.
The plunger pump according to claim 25, further comprising a pump body structure and a plunger base connected with the pump body structure, the outer side of the guide block is provided with a first stepped annular surface and a second Stepped annular surface, the first stepped annular surface is matched with the plunger base, and the second stepped annular surface is matched with the pump body structure to ensure the plunger base and the pump body structure of concentricity.
The plunger pump according to claim 26, wherein the inner annular surface of the guide block cooperates with the plunger structure to ensure the plunger base, the pump body structure and the plunger structure of concentricity.
The plunger pump of claim 23, wherein at least one of the inner wall and the outer wall of the guide block is provided with a third seal.
The plunger pump according to claim 28, wherein the inner wall of the guide block is provided with the third sealing member, the third sealing member, the first sealing member and the second sealing member The spacing therebetween is greater than the travel distance of the plunger structure.
The plunger pump according to claim 28, wherein the outer wall of the guide block is provided with a fourth sealing member, and the diameter of the fourth sealing member is larger than the diameter of the third sealing member.
The plunger pump according to claim 23, wherein the guide block comprises a plastic guide block or a soft metal guide block.
The plunger pump according to claim 18, further comprising a pump body structure, wherein the plunger cavity is at least partially located in the pump body structure; the pump body structure comprises a bottom surface, and the bottom surface is provided with The plunger cavity communicates with the opening; the bottom surface is provided with an overflow groove, which is used for discharging the liquid overflowing from the plunger cavity out of the plunger cavity.
The plunger pump according to claim 31, wherein the overflow grooves respectively extend from the middle of the bottom surface of the pump body structure to the plunger cavity, so as to discharge the overflowed liquid from the plunger cavity the plunger cavity.
The plunger pump according to claim 31, wherein the overflow groove extends to the edge of the bottom surface of the pump body structure, so as to discharge the liquid overflowing from the plunger cavity out of the plunger cavity.
The plunger pump according to claim 31, wherein the bottom surface of the pump body structure further comprises a liquid storage tank, and the liquid storage tank communicates with the overflow tank.
The plunger pump according to claim 34, wherein the liquid storage tank extends to the edge of the bottom surface of the pump body structure, so as to discharge the liquid overflowing from the plunger cavity out of the plunger cavity.
The plunger pump according to claim 32, wherein the overflow hole comprises a first overflow hole, and the first overflow hole is provided in the two sealing members near the pump body structure. One, the first overflow hole extends to the opening and communicates with the overflow groove.
The plunger pump according to claim 31, characterized in that, an inner wall of the plunger cavity located in the pump body structure is provided with a first receiving groove in the axial direction, and one of the two sealing members is close to the pump. One of the body structures is arranged in the first receiving groove.
The plunger pump according to claim 37, wherein a bottom wall of the first receiving groove is formed with a first chamfered portion.
The plunger pump according to claim 36, further comprising a plunger base connected to the pump body structure, the plunger cavity is at least partially located in the plunger base, and the plunger base is at least partially located in the plunger base. The side wall is provided with a diversion groove;

The overflow hole includes a second overflow hole, and the second overflow hole is arranged in one of the two seals that is close to the plunger base, and the second overflow hole is connected to the flow guide. Slots are connected.
The plunger pump according to claim 39, wherein the inner wall of the plunger cavity located in the plunger base is axially provided with a second receiving groove, and the two seals are close to the column One of the plug bases is disposed in the second receiving groove.
The plunger pump according to claim 40, wherein a bottom wall of the second receiving groove is formed with a second chamfered portion.
The plunger pump according to claim 39, wherein the bottom of the plunger base is provided with a guide sleeve, the guide sleeve corresponds to the position of the plunger cavity, and the plunger structure is penetrated through the The guide sleeve is capable of reciprocating motion relative to the guide sleeve.
The plunger pump according to claim 42, wherein the inner wall of the guide sleeve is provided with a groove portion, and the groove portion is provided with a guide ring.
The plunger pump according to claim 42, wherein the outer diameter of the top end of the guide sleeve is larger than the outer diameter of the bottom end of the guide sleeve.
The plunger pump according to claim 42, wherein a liquid guide groove is provided on the top of the guide sleeve, and the liquid guide groove extends to the side wall of the guide sleeve.
The plunger pump according to claim 42, further comprising a plunger spring sleeved on the plunger structure, wherein the first end of the plunger spring is sleeved on the guide sleeve and abuts against The bottom of the plunger base and the second end of the plunger spring are connected with the plunger structure.
The plunger pump according to claim 39, wherein the diameter of the first overflow hole is larger than the diameter of the second overflow hole.
A plant protection drone is characterized by comprising a fuselage and at least one plunger pump according to any one of claims 18-48, wherein the at least one plunger pump is mounted on the fuselage.
A plunger pump, characterized in that, comprising:

The transmission cavity is provided with lubricants;

a transmission structure, accommodated in the cavity of the transmission cavity;

a plunger cavity, communicated with the transmission cavity;

a plunger structure, at least partially accommodated in the plunger cavity;

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

a magnetic component, mechanically coupled to the transmission cavity,

Wherein, the magnetic component can adsorb the solid particles in the lubricant.
The plunger pump according to claim 50, wherein the magnetic component is arranged inside or outside the transmission cavity; when the magnetic component is arranged outside the transmission cavity, the magnetic component generates a The magnetic field can penetrate the inner wall of the transmission cavity.
The plunger pump according to claim 50, wherein the side wall of the transmission cavity is provided with a liquid guide hole, and the magnetic component is provided in the transmission cavity at a position corresponding to the liquid guide hole.
The plunger pump according to claim 52, further comprising a sealing plug for sealing the liquid guide hole, the magnetic component is mechanically coupled with the sealing plug, and the sealing plug is in the The position of the liquid guide hole is detachably connected with the transmission cavity.
The plunger pump according to claim 53, wherein the position where the liquid guide hole is opened in the transmission cavity corresponds to the contact position between the transmission structure and the plunger structure.
The plunger pump according to claim 53, wherein the magnetic attachment comprises a chip suction magnet and a chip storage groove provided at the liquid guide hole, and the chip storage groove is adjacent to the chip suction magnet.
The plunger pump according to claim 50, wherein the power device drives the transmission structure to rotate, so as to drive the plunger structure to reciprocate; the magnetic component is a tangent to the rotation direction of the transmission structure The direction is set in the transmission cavity.
The plunger pump according to claim 50, wherein the transmission chamber is connected with the power device.
The plunger pump according to claim 50, wherein the transmission structure comprises a guide sleeve, and the plunger structure passes through the guide sleeve.
The plunger pump according to claim 58, wherein the transmission structure comprises a plunger base, the guide sleeve is connected to the plunger base, and the plunger structure passes through the plunger base and the plunger base. the guide sleeve.
The plunger pump according to claim 58, wherein a guide ring is provided between the plunger structure and the inner wall of the guide sleeve.
The plunger pump of claim 60, wherein the guide ring comprises a plastic guide ring or a soft metal guide ring.
The plunger pump according to claim 50, further comprising a pump body structure provided with a liquid inlet cavity and a liquid outlet cavity, and the plunger cavity is arranged in the pump body structure;

The plunger structure reciprocates in the plunger cavity, so that the plunger pump sucks the liquid into the liquid inlet cavity and squeezes the liquid out of the liquid outlet cavity.
The plunger pump according to claim 62, wherein the pump body structure is detachably connected to the transmission cavity.
The plunger pump according to claim 50, wherein the transmission chamber is detachably connected to the power device.
A plant protection drone is characterized by comprising a fuselage and at least one plunger pump according to any one of claims 50-64, wherein the at least one plunger pump is mounted on the fuselage.
A spraying device, characterized by comprising a main body and at least one plunger pump according to any one of claims 1-16, 18-48, 50-64, wherein the at least one plunger pump is mounted on the main body.
The spraying equipment according to claim 66, characterized in that, the spraying equipment comprises a plant protection drone, a pesticide spraying vehicle, a manpower spraying device, a car washer and a medicine applicator.