A new type of near-leakage vertical plunger pump

Abstract

The present application relates to the technical fields of hydraulic pump, more particularly to a new type of near no leakage vertical plunger pump, comprising: a cylinder body, one end of the cylinder body is an open end and the other end is a closed end; an end cover connected to the open end of the cylinder body; an elastic sealing member connected between the cylinder body and the end cover, a sealed working chamber being formed between the elastic sealing member and the cylinder body; a plunger, a first plug body in the middle of the plunger sliding in a central hole, a second plug body at one end of the first plug body inserted into the cylinder body and pressed on the elastic sealing member, a base at the other end of the first plug body fixed between the end cover and provided with a return spring; a driving component connected to the closed end of the cylinder body for driving the cylinder body to move towards the plunger direction. The present application uses an elastic sealing member to replace a sealing ring to separate the plunger part and the cylinder part, and achieves a sealing effect through the expansion and contraction of the elastic sealing member between the outside of the plunger, the inside of the cylinder and the end cover, thereby solving the problem of external leakage of the vertical plunger pump.

Description

Technical Field

[0001] This invention relates to the field of hydraulic pump technology, and more specifically, to a novel near-leakage-free vertical piston pump. Background Technology

[0002] Piston pumps are crucial power components in hydraulic systems, converting mechanical energy from motors and other sources into hydraulic pressure energy. Traditional vertical piston pumps use a cam to drive the piston in a reciprocating linear motion within the cylinder, achieving oil suction and discharge through changes in pump chamber volume. Vertical piston pumps are particularly suitable for high-pressure, flow-regulating applications. However, with the expansion of their applications, oil leakage has become a growing concern. Severe leakage can reduce the efficiency of the entire hydraulic system and even pose safety hazards. Common hydraulic seal types include O-rings, Y-rings, and U-rings. Traditional seals in vertical piston pumps cannot achieve completely leak-free sealing. According to classical fluid mechanics, pump leakage is directly proportional to the pressure difference across the seal; as operating pressure increases, leakage also increases, leading to a decrease in pump volumetric efficiency.

[0003] A vertical piston pump is a cam-mechanism reciprocating pump with a single piston structure. It is suitable for various working applications and can fulfill different operational requirements. Conventional vertical piston pumps use an eccentric wheel that contacts the piston through bearings or other parts. Although the piston is equipped with an oil retaining ring, oil leakage is still unavoidable during operation. Summary of the Invention

[0004] The summary section introduces a series of simplified concepts, which will be further explained in detail in the detailed description section. The summary section of this invention is not intended to limit the key features and essential technical features of the claimed technical solution, nor is it intended to determine the scope of protection of the claimed technical solution.

[0005] To at least partially solve the above problems, the present invention provides a novel near-leakage-free vertical plunger pump, comprising:

[0006] The cylinder block has an open end and a closed end.

[0007] End cap, connected to the open end of the cylinder block;

[0008] An elastic sealing member is connected between the cylinder body and the end cover, and a sealed working cavity is formed between the elastic sealing member and the cylinder body;

[0009] The plunger slides in the center hole of the end cap, one end of the plunger is inserted into the cylinder body and presses against the elastic sealing member, and the other end of the plunger is fixed to the base. A return spring is provided between the base and the end cap.

[0010] The drive unit is connected to the closed end of the cylinder block and is used to drive the cylinder block to move in the direction of the plunger.

[0011] Optionally, the cylinder body has an inlet with a one-way oil suction valve on one side and an outlet with a pressure valve on the other side.

[0012] Optionally, both the suction valve and the pressure valve are one-way butterfly valves.

[0013] Optionally, the suction valve and the pressure valve are arranged opposite to each other on both sides of the cylinder body.

[0014] Optionally, the side of the end cap connected to the cylinder body is provided with a retaining groove communicating with the central hole, and one end of the plunger inserted into the cylinder body can be inserted and fitted into the retaining groove.

[0015] Optionally, the return spring is sleeved on the plunger.

[0016] Optionally, the diameter of the plunger is smaller than the inner diameter of the cylinder.

[0017] Compared with the prior art, the present invention has at least the following beneficial effects:

[0018] This invention discloses a novel near-leakage-free vertical plunger pump that uses an elastic sealing member instead of a sealing ring to separate the plunger and cylinder parts. The sealing effect is achieved by the expansion and contraction of the elastic sealing member between the outside of the plunger, the inside of the cylinder, and the end cap, thus solving the problem of external leakage in vertical plunger pumps. The cylinder and plunger are inverted, and the oil in the sealed working chamber is always sealed between the cylinder and the elastic sealing member. Even if the pressure increases, there will be no external leakage, making it safe and reliable.

[0019] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0020] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0021] Figure 1 This is a schematic diagram of the structure of a novel near-leakage-free vertical plunger pump provided in an embodiment of the present invention;

[0022] Figure 2 A schematic diagram illustrating the use of the present invention as a mixture conveying pump is provided for an embodiment of the present invention;

[0023] Figure 3 A schematic diagram illustrating the use of the present invention as a supply pump for a medical water jet, provided for an embodiment of the present invention;

[0024] Figure 4 This is a schematic diagram of the plunger and end cap provided in an embodiment of the present invention;

[0025] Figure 5 A cross-sectional view of the plunger and end cap provided in an embodiment of the present invention;

[0026] Figure 6 This is a schematic diagram of the structure of the annular adjusting plug provided in an embodiment of the present invention;

[0027] Figure 7 This is a cross-sectional view of the annular regulating plug provided in an embodiment of the present invention;

[0028] Figure 8 This is a schematic diagram of the structure of the central plug provided in an embodiment of the present invention;

[0029] Figure 9 This is a schematic diagram of the screw mechanism provided in an embodiment of the present invention;

[0030] Figure 10 This is a schematic diagram of the control mechanism provided in an embodiment of the present invention.

[0031] Icons: Drive component 1; Cylinder 2; Suction valve 3; End cap 4; Elastic sealing component 5; Pressure valve 6; Plunger 7; Return spring 8; Annular adjusting plug 9; First annular plug 901; Second annular plug 902; Third annular plug 903; Center plug 10; Tightening screw 11; Control mechanism 12; Adjusting screw 1201; Sliding pressure plate 1202; Linkage plate 1203; Push-pull connecting rod 1204; Push-pull seat 1205; Adjusting insert shaft 1206; Limiting ring 1207; Compression spring 1208; Conveying pipeline 13; Feeding device 14; Accumulator 15; Low-pressure pipeline 16; High-pressure pipeline 17; Centered direct-acting disc cam 18. Detailed Implementation

[0032] To enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0033] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments, so that those skilled in the art can implement it based on the description.

[0034] It should be understood that terms such as “having,” “comprising,” and “including” as used herein do not exclude the presence or addition of one or more other elements or combinations thereof.

[0035] The following is in conjunction with the appendix Figure 1-10 The present invention will be described in further detail below.

[0036] Example 1

[0037] like Figure 1 As shown, a novel near-leakage-free vertical plunger pump includes:

[0038] Cylinder 2, one end of cylinder 2 is open and the other end is closed;

[0039] End cap 4, connected to the open end of cylinder 2;

[0040] The elastic sealing member 5 is connected between the cylinder body 2 and the end cover 4, and a sealed working cavity is formed between the elastic sealing member 5 and the cylinder body 2;

[0041] The plunger 7 slides in the center hole of the end cover 4. One end of the plunger 7 is inserted into the cylinder 2 and presses against the elastic sealing member 5. The other end of the plunger 7 is fixed to the base. A return spring 8 is provided between the base and the end cover 4.

[0042] The drive component 1 is connected to the closed end of the cylinder 2 and is used to drive the cylinder 2 to move in the direction of the plunger 7.

[0043] The cylinder 2 has an inlet with a one-way oil suction valve 3 on one side and an outlet with a one-way oil pressure valve 6 on the other side.

[0044] This invention discloses a novel near-leakage-free vertical plunger pump. During operation, the driving component 1 drives the cylinder 2 towards the plunger 7. The cylinder 2 drives the end cover 4 to slide on the plunger 7, compressing the return spring 8. At this time, the volume of the sealed working chamber decreases, the pressure valve 6 opens, and the suction valve 3 closes. The medium in the sealed working chamber can be discharged through the outlet with the pressure valve 6. After the driving component 1 releases its control over the cylinder 2, the end cover 4, under the elastic force of the return spring 8, drives the cylinder 2 to move upward in a linear reset motion. At this time, the volume of the sealed working chamber increases, the pressure valve 6 closes, and the suction valve 3 opens, creating a vacuum in the sealed working chamber, thereby allowing the pump to... The inlet with a one-way suction valve 3 draws the medium into the sealed working chamber, facilitating subsequent pressure delivery. During the medium intake and discharge process, the sealed working chamber composed of the cylinder 2 and the elastic sealing member 5 will not leak; only the volume of the elastic sealing member 5 will change slightly, resulting in a volumetric efficiency close to 100%. This invention can be used for the closed delivery of media with different properties, especially high-viscosity liquids and liquid-solid mixtures containing particles, without leakage. During the delivery process, the external environment will not pollute the delivery medium, and the delivery medium will not pollute the external environment. Compared with some existing delivery pumps, such as peristaltic pumps, its head is significantly improved, making it suitable for long delivery distances and high-pressure applications.

[0045] In traditional vertical piston pump structures, the return spring is located inside the cylinder body, in contact with the top of the piston, limiting the choice of spring size. In this invention, the return spring 8 is located outside the cylinder body 2, fitted around the lower end of the piston 7, between the base and the end cap 4. Because there is ample space for component installation outside the cylinder body 2, the appropriate size of the return spring 8 can be selected based on the spring return force required for the piston pump's operation, and the deformation of the return spring 8 is not constrained by the cylinder body 2. Under the premise that the volume of cylinder 2 remains unchanged, the external placement of return spring 8 can increase the volume of medium in the sealed working chamber, thereby shortening the self-priming time and improving the self-priming capability to a certain extent. Common plunger pump sealing structures require low surface roughness at the mating position of cylinder 2 and plunger 7, requiring high machining accuracy. The machining accuracy requirements of the inner side of cylinder 2 in this invention are low, the bottom and side of cylinder 2 do not require machining, and only one rubber seal is needed in the pump, without the need for other sealing parts. In this invention, the flow distribution mechanism uses two one-way valves with opposite internal structures, suction valve 3 and pressure valve 6, which are installed on both sides of cylinder 2 to prevent oil from flowing backward. The hydraulic pipeline can be locked and pressure maintained in one direction, resulting in good sealing performance.

[0046] Both the suction valve 3 and the pressure valve 6 are one-way butterfly valves, and they are arranged opposite each other on both sides of the cylinder body 2. The suction valve 3 and the pressure valve 6 are two one-way valves with opposite internal structures, installed on both sides of the cylinder body to prevent reverse flow of the medium. They can be locked and pressure-maintained in one direction in the hydraulic pipeline, providing good sealing performance.

[0047] The end cap 4 is provided with a retaining groove on the side connected to the cylinder body 2, which communicates with the central hole. One end of the plunger 7 inserted into the cylinder body 2 can be inserted and fitted into the retaining groove.

[0048] The return spring 8 is sleeved on the plunger 7.

[0049] The diameter of the plunger 7 is smaller than the inner diameter of the cylinder 2.

[0050] The drive component 1 includes a motor and a cam fixed to the output shaft of the motor. The cam wheel surface presses against the closed end of the cylinder 2. After the motor starts, it drives the cam to rotate. When the end of the cam away from the output shaft of the motor contacts the closed end of the cylinder 2, it can press and drive the cylinder 2 and the end cover 4 to slide downward on the plunger 7. At this time, the end cover 4 compresses the return spring 8. When the end of the cam close to the output shaft of the motor contacts the closed end of the cylinder 2, the cylinder 2 and the end cover 4 can slide upward on the plunger 7 and reset under the elastic force of the return spring 8, thereby completing the extraction and discharge of the medium.

[0051] Example 2

[0052] like Figure 2As shown, this invention provides a novel near-leakage-free vertical plunger pump that can be used as a mixture transfer pump. The transfer medium can be a liquid or a solid-liquid medium. (Refer to...) Figure 2 The suction valve 3 and pressure valve 6 are one-way butterfly valves, placed opposite each other. When fully open, the butterfly valve has a large effective flow area and low fluid resistance, effectively controlling the unidirectional flow of the mixed fluid. The cylinder body 2 and the elastic sealing component 5 form a sealed working chamber. After the drive component 1 starts, the cam drives the cylinder body 2 and end cover 4 to move downwards in a linear motion. During the return stroke, under the action of the plunger return spring 8, the cylinder body 2 and end cover 4 move upwards, causing a periodic change in the volume of the sealed working chamber. When the volume of the sealed working chamber increases, the pressure valve 6 closes and the suction valve 3 opens, creating a vacuum in the cylinder. The conveying pipeline draws the medium from the feeding device 14 into the cylinder body 2. When the volume of the sealed working chamber decreases, the pressure valve 6 opens and the suction valve 3 closes, and the medium is discharged from the cylinder body 2 through the conveying pipeline 13, thus achieving the purpose of conveying the medium. Throughout the entire process, the sealed working chamber formed by the cylinder body 2 and the elastic sealing component 5 will not leak; only the volume of the elastic sealing component 5 will undergo a slight change, resulting in a volumetric efficiency close to 100%. This embodiment has a simple structure and can be used for the closed-loop transport of media with different properties, especially high-viscosity liquids and liquid-solid mixtures containing particles. Since there is no leakage, the external environment will not contaminate the transported medium during the transport process, and the transported medium will not contaminate the external environment. Compared with some existing transport pumps (such as peristaltic pumps), the head is significantly increased, making it suitable for applications with long transport distances and high pressures.

[0053] Example 3

[0054] like Figure 3 As shown, this invention provides a novel near-leakage-free vertical plunger pump, which can be used as a supply pump for a medical water jet. (Refer to...) Figure 3The system includes two plunger pumps, a drive mechanism, an accumulator 15, a low-pressure line 16, and a high-pressure line 17. The drive mechanism is connected to the cylinders 2 of the two plunger pumps and includes a motor and two sets of concentrically driven disc cams 18 fixed on the motor output shaft. The inlets of the suction valves 3 of both plunger pumps are connected to a sterile saline storage container through the low-pressure line 16, and the pressure valves 6 of both plunger pumps are connected to nozzles through the high-pressure line 17. The accumulator 15 is installed on the high-pressure line 17 of the two plunger pumps as a device to reduce pressure pulsation. After the motor starts, it drives the two sets of concentrically driven disc cams 18 to rotate, causing the cylinders 2 and end caps 4 of the two plunger pumps to perform reciprocating linear motion. When the direct-acting disc cam 18 moves in the push stroke, the cylinder 2 and end cap 4 work on the supply pump, and sterile saline enters the high-pressure pipeline 17 through the pressure valve 6. The liquid is then sprayed out at a certain pressure by operating the nozzle. When the direct-acting disc cam 18 moves in the return stroke, the cylinder 2 and end cap 4 move upward under the elastic force of the return spring 8. At this time, the pressure inside the cylinder 2 is relatively low, and sterile saline enters the cylinder 2 through the suction valve 3 from the low-pressure pipeline 16, completing the negative pressure suction function of the medical water jet. The mechanical structure of the medical water jet designed in this embodiment can effectively prevent leakage of high-pressure sterile saline and avoid contamination of the sterile saline by the external environment due to leakage. At the same time, it has a high output pressure, with a rated pressure of over 2MPa. Its structure is relatively simple, and with the help of the electronic control system and surrounding accessories, it can realize the functions of tissue cutting and wound cleaning.

[0055] Example 4

[0056] like Figure 1-10 As shown, in a novel near-leakage-free vertical plunger pump of the present invention, the plunger 7 includes a central plunger body 10. The central plunger body 10 slides in the central hole of the end cap 4. The end of the central plunger body 10 away from the cylinder 2 is fixed to a base. The end of the central plunger body 10 inserted into the cylinder 2 slides on the inner ring surface of the annular adjusting plug 9. A first slider fixed on the inner ring surface of the annular adjusting plug 9 slides in a first slide rail on the outer ring surface of the central plunger body 10. The first slide rail is arranged along the axial direction of the central plunger body 10. When the first slider slides to the upper end of the inner side of the first slide rail, the top surface of the annular adjusting plug 9 is coplanar with the top surface of the central plunger body 10. A control cavity is provided at the end of the central plunger body 10 away from the cylinder 2. An adjustment mechanism 12 is connected in the control cavity. The adjustment mechanism 12 can be inserted into the annular adjusting plug 9 so that the annular adjusting plug 9 and the central plunger body 10 are relatively fixed or relatively slidable.

[0057] The structure of the plunger 7 allows for adjustment of the volume of the medium extruded in conjunction with the plunger 7 when the cylinder 2 and end cap 4 move downwards in a linear motion. This adjusts the volume to meet the medium delivery requirements under different conditions. When the regulating mechanism 12 is inserted into the annular regulating plug 9, the annular regulating plug 9 and the central plug 10 are relatively fixed. At this time, when the cylinder 2 and end cap 4 move downwards in a linear motion, the central plug 10 and the annular regulating plug 9 form a single integrated structure. The volume of the pressure plug formed by the central plug 10, the annular regulating plug 9, and the elastic sealing member 5 is maximized, thus maximizing the volume of the medium extruded by the plunger 7 in conjunction with the elastic sealing member 5. To reduce the volume of the extruded medium, the regulating mechanism 12 is adjusted. When the control mechanism 12 separates from the annular adjusting plug 9, the cylinder body 2 and end cover 4 move downwards in a straight line. The annular adjusting plug 9 also moves downwards under its own weight until the bottom of the annular adjusting plug 9 is in the retaining groove. At this time, the central plug 10 is exposed due to the downward movement of the annular adjusting plug 9. The central plug 10 comes into contact with the elastic sealing member 5. The volume of the pressure plug formed by the central plug 10 and the elastic sealing member 5 is small. Therefore, when the cylinder body 2 and end cover 4 move downwards in a straight line, the volume of the compressed medium is reduced. This structure makes full use of the elastic deformable structure of the elastic sealing member 5 to meet the medium output requirements under different conditions.

[0058] The annular adjusting plug 9 includes a first annular plug 901 that slides on the outer annular surface of the central plug body 10, a second annular plug 902 that slides on the first annular plug 901, and a third annular plug 903 that slides on the second annular plug 902. A first slider is fixed inside the first annular plug 901. A second slide is provided on the outer annular surface of the first annular plug 901, and a second slider fixed on the inner annular surface of the second annular plug 902 slides in the second slide. A third slide is provided on the outer annular surface of the second annular plug 902, and a third slider fixed on the inner annular surface of the third annular plug 903 slides in the third slide. The third annular plug 903 can slide in a retaining groove. The outer diameter of the first annular plug 901 is larger than the diameter of the central hole.

[0059] The structure of the annular adjusting plug 9 allows for further adjustment of the volume of the plug formed by the annular adjusting plug 9 and the central plug 10. The first annular plug 901, the second annular plug 902, and the third annular plug 903 are coaxially arranged and are respectively connected to the slide rail via a slider, so that the first annular plug 901, the second annular plug 902, and the third annular plug 903 are axially limited and can only be adjusted by sliding up and down. In use, the adjusting mechanism 12 can be inserted into the first annular plug 901, the second annular plug 902, or the third annular plug 903, so that the elastic sealing member 5 and the plunger 7 can cooperate to form a variety of plugs with different volumes.

[0060] The control mechanism 12 includes an adjusting screw 1201 that rotates on the inner side of the control cavity. A sliding pressure plate 1202 is threaded onto the adjusting screw 1201. The sliding pressure plate 1202 slides on the inner side of the control cavity, and a limiting slider fixed on the sliding pressure plate 1202 slides within a limiting slide rail on the inner side of the control cavity. A linkage plate 1203 is slidably coupled onto the adjusting screw 1201. One end of the linkage plate 1203 is rotatably connected to one end of a push-pull connecting rod 1204. The other end of the push-pull connecting rod 1204 rotates on a push-pull seat 1205. The inner end of an adjusting insert shaft 1206 is fixed on the push-pull seat 1205. The middle part of the adjusting insert shaft 1206 slides within a guide transverse hole on the side of the central plug 10. The outer end of the 6 can be inserted into the first insertion hole of the first annular plug 901, the second insertion hole of the second annular plug 902, and the third insertion hole of the third annular plug 903; a limiting ring 1207 is fixed on the adjusting screw 1201, and a compression spring 1208 is fixed between the limiting ring 1207 and the linkage plate 1203. The linkage plate 1203 is located between the limiting ring 1207 and the sliding pressure plate 1202; a screw 11 is threadedly connected to the end cover 4, and the screw 11 is fitted to the outer end of the adjusting shaft 1206. The inner end of the screw 11 can be inserted into the third insertion hole, the second insertion hole, and the first insertion hole from the outside to the inside; both the inner end of the screw 11 and the outer end of the adjusting shaft 1206 are provided with hemispherical top pressure heads.

[0061] The control mechanism 12 is used to adjust the volume of the pressure plug formed by the cooperation of the central plug 10 and the annular adjusting plug 9. In use, the contact position between the adjusting screw 1201 and the sliding pressure plate 1202 can be changed by rotating the adjusting screw 1201, thereby causing the sliding pressure plate 1202 to slide on the inner side of the control cavity. When the sliding pressure plate 1202 presses the linkage plate 1203 downwards to compress the compression spring 1208, the linkage plate 1203 can drive one end of the push-pull connecting rod 1204 downwards, and the other end of the push-pull connecting rod 1204 drives the push-pull seat 1205 to move towards the inner side of the control cavity. The push-pull seat 1205 drives the adjusting shaft 1206 to move towards the control cavity, causing the adjusting shaft 1206 to sequentially release the insertion limit on the third insertion hole of the third annular plug 903, the second insertion hole of the second annular plug 902, and the first insertion hole of the first annular plug 901. At this time, the adjustable center plug 10 can be used in conjunction with the first annular plug 901 as a small-volume primary stopper, or the center plug 10 can be used in conjunction with the first annular plug 901 and the second annular plug 902 as a medium-volume secondary stopper, or the center plug 10 can be used in conjunction with the first annular plug 901 and the second annular plug 902 as a medium-volume secondary stopper. The annular plug 901, the second annular plug 902, and the third annular plug 903 work together as the largest three-stage pressure plug. The larger the volume, the more medium is compressed. The elastic sealing member 5 and the plunger 7 work together to form pressure plugs of various volumes, which is beneficial to meet the needs of various usage conditions. During adjustment, it can also be adjusted by rotating the screw 11. When the screw 11 is rotated until it contacts the adjusting shaft 1206, it can push the adjusting shaft 1206 towards the center of the central plug 10, which allows the adjusting shaft 1206 to gradually release. In addition to limiting the positioning of the third annular plug 903, the second annular plug 902, and the first annular plug 901, when the screw 11 is turned to press the adjusting shaft 1206, it can be gradually inserted into the third insertion hole of the third annular plug 903, the second insertion hole of the second annular plug 902, and the first insertion hole of the first annular plug 901. This allows the end cover 4 to move the third annular plug 903, the second annular plug 902, and the first annular plug 901 by turning the screw 11 when the cylinder 2 and the end cover 4 move downwards in a straight line, thereby improving the stability of the final formed plug volume.

[0062] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0063] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0064] Although embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for the present invention. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. A novel near-leakage-free vertical plunger pump, characterized in that, include: Cylinder (2), one end of cylinder (2) is open and the other end is closed; End cap (4), connected to the open end of cylinder body (2); An elastic sealing member (5) is connected between the cylinder body (2) and the end cap (4), and a sealed working cavity is formed between the elastic sealing member (5) and the cylinder body (2); The plunger (7) slides in the center hole of the end cap (4) at the middle. One end of the plunger (7) is inserted into the cylinder (2) and presses against the elastic sealing member (5). The other end of the plunger (7) is fixed to the base. A return spring (8) is provided between the base and the end cap (4). The drive component (1) is connected to the closed end of the cylinder (2) to drive the cylinder (2) to move in the direction of the plunger (7); The end cap (4) is connected to the cylinder body (2) on one side and has a retaining groove that communicates with the center hole. The end of the plunger (7) inserted into the cylinder body (2) can be inserted into the retaining groove. The diameter of the plunger (7) is smaller than the inner diameter of the cylinder (2); The plunger (7) includes a central plunger body (10), the central plunger body (10) slides in the center hole of the end cap 4, the end of the central plunger body (10) away from the cylinder (2) is fixed to a base, the end of the central plunger body (10) inserted into the cylinder (2) slides on the inner ring surface of the annular adjusting plug (9), the first slider fixed on the inner ring surface of the annular adjusting plug (9) slides in the first slide rail on the outer ring surface of the central plunger body (10), the first slide rail is set along the axial direction of the central plunger body (10); when the first slider slides to the upper end of the inner side of the first slide rail, the top surface of the annular adjusting plug (9) is coplanar with the top surface of the central plunger body (10); the end of the central plunger body (10) away from the cylinder (2) is provided with a control cavity, and the control cavity is connected to a regulating mechanism (12), the regulating mechanism (12) can be inserted into the annular adjusting plug (9) so that the annular adjusting plug (9) and the central plunger body (10) are relatively fixed or relatively slidable.

2. The novel near-leakage-free vertical plunger pump according to claim 1, characterized in that, The cylinder (2) has an inlet with a one-way oil suction valve (3) on one side and an outlet with a one-way oil pressure valve (6) on the other side.

3. A novel near-leakage-free vertical plunger pump according to claim 2, characterized in that, Both the suction valve (3) and the pressure valve (6) are one-way butterfly valves.

4. A novel near-leakage-free vertical plunger pump according to claim 2, characterized in that, The suction valve (3) and the pressure valve (6) are arranged opposite to each other on both sides of the cylinder body (2).

5. A novel near-leakage-free vertical plunger pump according to claim 1, characterized in that, The return spring (8) is sleeved on the plunger (7).

6. A novel near-leakage-free vertical plunger pump according to claim 1, characterized in that, The annular adjusting plug (9) includes a first annular plug (901) that slides on the outer annular surface of the central plug (10), a second annular plug (902) that slides on the first annular plug (901), and a third annular plug (903) that slides on the second annular plug (902). A first slider is fixed inside the first annular plug (901). A second slide is provided on the outer annular surface of the first annular plug (901), and a second slider fixed on the inner annular surface of the second annular plug (902) slides in the second slide. A third slide is provided on the outer annular surface of the second annular plug (902), and a third slider fixed on the inner annular surface of the third annular plug (903) slides in the third slide. The third annular plug (903) can slide in the retaining groove. The outer diameter of the first annular plug (901) is larger than the diameter of the central hole.

7. A novel near-leakage-free vertical plunger pump according to claim 6, characterized in that, The control mechanism (12) includes an adjusting screw (1201) that rotates on the inner side of the control cavity, a sliding pressure plate (1202) that is threaded onto the adjusting screw (1201), the sliding pressure plate (1202) sliding on the inner side of the control cavity, and a limiting slider fixed on the sliding pressure plate (1202) sliding in the limiting slide rail on the inner side of the control cavity; a linkage plate (1203) that is slidably engaged on the adjusting screw (1201), one end of the linkage plate (1203) being rotatably connected to one end of a push-pull connecting rod (1204), the other end of the push-pull connecting rod (1204) rotating on a push-pull seat (1205), the inner end of an adjusting insert shaft (1206) fixed on the push-pull seat (1205), the middle part of the adjusting insert shaft (1206) sliding in the guide transverse hole on the side of the central plug (10), and the adjusting insert shaft (1206) The outer end can be inserted into the first insertion hole of the first annular plug (901), the second insertion hole of the second annular plug (902), and the third insertion hole of the third annular plug (903); a limiting ring (1207) is fixed on the adjusting screw (1201), and a compression spring (1208) is fixed between the limiting ring (1207) and the linkage plate (1203). The linkage plate (1203) is located between the limiting ring (1207) and the sliding pressure plate (1202); a screw (11) is threaded on the end cover (4), and the screw (11) is fitted to the outer end of the adjusting shaft (1206). The inner end of the screw (11) can be inserted into the third insertion hole, the second insertion hole, and the first insertion hole from the outside to the inside; both the inner end of the screw (11) and the outer end of the adjusting shaft (1206) are provided with hemispherical top pressure heads.

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