CN110242557B

CN110242557B - Plunger piston

Info

Publication number: CN110242557B
Application number: CN201910534533.0A
Authority: CN
Inventors: 刘书豪; 唐勇; 陈俊宏; 苏诗策; 刘树飞
Original assignee: Chengdu Bison Technology Co ltd
Current assignee: Chengdu Bison Technology Co ltd
Priority date: 2019-06-20
Filing date: 2019-06-20
Publication date: 2024-03-08
Anticipated expiration: 2039-06-20
Also published as: CN110242557A

Abstract

The application relates to the technical field of natural gas and petroleum exploitation and discloses a plunger. In the working process of the plunger provided by the embodiment of the application, the first sealing flange and the second sealing flange are always inserted into the annular accommodating groove, so that fluid flow between the sealing gasket and the core body is limited, sealing performance is improved, and the liquid accumulation lifting efficiency is improved. In addition, since the gasket moves only radially during operation and only moves circumferentially between the lower edge of the first protrusion and the upper edge of the second protrusion, the distance between the lower edge of the first protrusion and the upper edge of the second protrusion can be set as small as possible, and the width of the transverse section can be made as small as possible. The gap between the bent gaskets and the transverse section with the small width enable the fluid flow between the sealing gaskets to be greatly reduced, so that the sealing performance is improved, and the hydrops lifting efficiency is improved.

Description

Plunger piston

Technical Field

The application relates to the technical field of natural gas and petroleum exploitation, in particular to a plunger.

Background

In the development of natural gas or petroleum wells, it is necessary to lift the bottom of the well to the surface in order to increase the production of natural gas or petroleum.

A plunger is provided in the related art. The periphery of the core body of the plunger is provided with a plurality of sealing gaskets, and the sealing gaskets are always contacted with the inner wall of the well under the action of the elastic piece to form sealing. The plunger is lowered downhole in a shut-in condition. When the well is opened, the pressure generated by the fluid below the plunger drives the plunger to move upwards, so that the accumulated liquid above the plunger is lifted upwards, and the accumulated liquid above the plunger is discharged through the wellhead.

The above-mentioned plunger has a problem in that, when the gasket is radially outwardly expanded by the elastic member, a gap is generated between the adjacent gaskets, and a gap is also generated between the gasket and the core. In the process of lifting the effusion, the effusion above the plunger may flow downwards through the gap, and the fluid below the plunger may flow upwards through the gap, so that larger leakage is caused, and poor effusion lifting efficiency is caused.

Disclosure of Invention

Embodiments of the present application provide a plunger that can restrict fluid flow between a sealing gasket and a core, thereby improving sealing performance and helping to improve the efficiency of liquid accumulation lifting.

In order to achieve the above purpose, the embodiments of the present application adopt the following technical solutions:

a plunger, comprising: the cylindrical core body, the peripheral surface of the core body has annular holding grooves extending along the circumference; the sealing gasket comprises an arc-shaped main body surrounding the core body, wherein the upper part of one circumferential side of the arc-shaped main body extends along the circumferential direction to form a first convex part, a second notch is formed below the first convex part, the other circumferential side of the arc-shaped main body extends along the circumferential direction to form a second convex part positioned below the first convex part, and a first notch is formed above the second convex part; the first notch is complementary to the first convex part, and the second notch is complementary to the second convex part; a plurality of sealing gaskets disposed around the core and configured to reciprocate radially; a first elastic member acting on the sealing gasket and configured to impart a radially outward movement tendency to the sealing gasket; a first sealing flange and a second sealing flange protruding radially inward from an inner surface of the sealing gasket, the first sealing flange extending along a lower edge of the first protrusion to the arc-shaped body, the second sealing flange extending along an upper edge of the second protrusion to the arc-shaped body, the first sealing flange and the second sealing flange overlapping at the arc-shaped body; wherein the first convex part of one sealing gasket is positioned in the first notch of the adjacent other sealing gasket; the second convex part of one sealing gasket is positioned in the second notch of the adjacent other sealing gasket; the first sealing flange and the second sealing flange are radially movably inserted into the annular accommodating groove.

In the working process of the plunger provided by the embodiment of the application, the first sealing flange and the second sealing flange are always inserted into the annular accommodating groove, so that fluid flow between the sealing gasket and the core body is limited, sealing performance is improved, and the liquid accumulation lifting efficiency is improved. In addition, the first protrusion of one sealing gasket is located in the first notch of the adjacent other sealing gasket, and the second protrusion of one sealing gasket is located in the second notch of the adjacent other sealing gasket, so that a bent gasket gap can be formed between the adjacent sealing gaskets, the bent gasket gap comprising a transverse section defined by the lower edge of the first protrusion and the upper edge of the second protrusion together, an upper longitudinal section defined by the circumferential side of the first protrusion and the circumferential side of the arc-shaped body of the adjacent sealing gasket, and a lower longitudinal section defined by the circumferential side of the second protrusion and the circumferential side of the arc-shaped body of the adjacent sealing gasket. Since the gasket has only radial movement during operation and only circumferential movement exists between the lower edge of the first protrusion and the upper edge of the second protrusion, the distance between the lower edge of the first protrusion and the upper edge of the second protrusion can be set as small as possible, and the width of the transverse section can be as small as possible. The gap between the bent gaskets and the transverse section with the small width enable the fluid flow between the sealing gaskets to be greatly reduced, so that the sealing performance is improved, and the hydrops lifting efficiency is improved.

Further, the inner peripheral surface of the annular accommodating groove is provided with a first accommodating hole extending radially inwards; the overlapping part of the first sealing flange of one sealing gasket and the second sealing flange of the other sealing gasket is opposite to the first accommodating hole in the two adjacent sealing gaskets; an elastic sealing mechanism is arranged in the first accommodating hole and abuts against the first sealing flange and the second sealing flange.

In the working process of the plunger provided by the embodiment of the application, after fluid enters the upper longitudinal section formed between the two adjacent sealing gaskets, the fluid can enter the annular containing groove through the gap between the first sealing flanges of the two adjacent sealing gaskets and flow along the annular containing groove, then enters the lower longitudinal section in the same gasket gap through the gap between the second sealing flanges of the two adjacent sealing gaskets, and is discharged out of the plunger through the lower longitudinal section. After the fluid enters the lower longitudinal section formed between the two adjacent sealing gaskets, the fluid can enter the annular accommodating groove through the gap between the second sealing flanges of the two adjacent sealing gaskets and flow along the annular accommodating groove, then enter the upper longitudinal section in the same gasket gap through the gap between the first sealing flanges of the two adjacent sealing gaskets, and are discharged to the outside of the plunger through the upper longitudinal section. The above-mentioned condition reduces the sealing performance of the plunger, and brings about partial leakage. In order to improve the problems, a first accommodating hole extending radially inwards is formed in the inner peripheral surface of the annular accommodating groove, and the overlapping part of the first sealing flange of one sealing gasket and the first sealing flange of the other sealing gasket is opposite to the first accommodating hole in two adjacent sealing gaskets; an elastic sealing mechanism is arranged in the first accommodating hole and abuts against the first sealing flange and the second sealing flange. Through the elastic sealing mechanism that is supported with first sealing flange and second sealing flange all the time, will be continuous annular holding tank is broken into a plurality of parts for in same gasket clearance, go up and indulge and put unable intercommunication through annular holding tank between the section with indulging down, thereby greatly reduced the plunger in the volume of fluid leakage in the course of the work, improved the sealing performance of plunger, can promote hydrops lifting efficiency.

Further, the inner peripheral surface of the annular accommodating groove is provided with a second accommodating hole extending radially inwards; the second accommodating hole is opposite to the overlapping part of the first sealing flange and the second sealing flange in the sealing gasket; an elastic sealing mechanism is arranged in the second accommodating hole and abuts against the first sealing flange and the second sealing flange.

In the working process of the plunger provided by the embodiment of the application, after fluid enters the upper longitudinal section formed between the two adjacent sealing gaskets, the fluid can enter the annular containing groove through the gap between the first sealing flanges of the two adjacent sealing gaskets and flow along the annular containing groove, then enters the lower longitudinal section through the space between the second sealing flanges on two sides of the gap between the adjacent sealing gaskets, and is discharged out of the plunger through the lower longitudinal section. After the fluid enters the lower longitudinal section formed between the two adjacent sealing gaskets, the fluid can enter the annular accommodating groove through the gap between the second sealing flanges of the two adjacent sealing gaskets and flow along the annular accommodating groove, then enter the upper longitudinal section through the space between the first sealing flanges at two sides of the gap between the adjacent sealing gaskets, and are discharged outside the plunger through the upper longitudinal section. The above-mentioned condition reduces the sealing performance of the plunger, and brings about partial leakage. In order to improve the problems, the inner peripheral surface of the annular accommodating groove is provided with a second accommodating hole extending radially inwards; the second accommodating hole is opposite to the overlapping part of the first sealing flange and the second sealing flange in the sealing gasket; an elastic sealing mechanism is arranged in the second accommodating hole and abuts against the first sealing flange and the second sealing flange. The continuous annular containing groove is broken into a plurality of parts through the elastic sealing mechanism which is always propped against the first sealing flange and the second sealing flange, so that fluid in the upper longitudinal section in one gasket gap cannot enter the lower longitudinal section in the adjacent other gasket gap through the annular containing groove, and fluid in the lower longitudinal section in one gasket gap cannot enter the upper longitudinal section in the adjacent other gasket gap through the annular containing groove. The plunger piston has the advantages that the fluid leakage amount of the plunger piston in the working process is greatly reduced, the sealing performance of the plunger piston is improved, and the accumulated liquid lifting efficiency can be improved.

Further, the inner peripheral surface of the annular accommodating groove is provided with a first accommodating hole extending radially inwards; the overlapping part of the first sealing flange of one sealing gasket and the first sealing flange of the other sealing gasket is opposite to the first accommodating hole in the two adjacent sealing gaskets; an elastic sealing mechanism is arranged in the first accommodating hole and abuts against the first sealing flange and the second sealing flange; the inner peripheral surface of the annular accommodating groove is provided with a second accommodating hole extending radially inwards; the second accommodating hole is opposite to the overlapping part of the first sealing flange and the second sealing flange in the sealing gasket; an elastic sealing mechanism is arranged in the second accommodating hole and abuts against the first sealing flange and the second sealing flange.

The embodiment of the application provides a plunger, owing to be provided with first accommodation hole, second accommodation hole and elastic sealing mechanism for in the same gasket clearance, go up to indulge and put the section and indulge down and put unable intercommunication through annular holding tank between the section, make in one gasket clearance in indulge the section fluid of putting down in another adjacent gasket clearance of unable entering through annular holding tank and indulge the section, also make in one gasket clearance in indulging down the section fluid of putting down in the section unable entering through annular holding tank in another adjacent gasket clearance of indulging. The plunger piston has the advantages that the fluid leakage amount of the plunger piston in the working process is greatly reduced, the sealing performance of the plunger piston is improved, and the accumulated liquid lifting efficiency can be improved.

Further, the elastic sealing mechanism comprises a second elastic piece and a sealing piece; the second elastic piece is propped against the sealing piece, so that the sealing piece is propped against the first sealing flange and the second sealing flange.

Further, the sealing element is columnar, one end face of the sealing element abuts against the first sealing flange and the second sealing flange, the other end face of the sealing element is provided with a positioning hole, and one end of the second elastic element is located in the positioning hole.

The embodiment of the application provides a plunger, offer the locating hole at one terminal surface of sealing member, the one end of second elastic component is located the locating hole, so can reduce the elastic sealing mechanism in radial ascending size, and then reduce the radial length in first accommodation hole or/and second accommodation hole, help increasing the intensity of core.

Further, the sealing member abuts against end surfaces of the first sealing flange and the second sealing flange to be in surface contact with the first sealing flange and the second sealing flange.

Further, the end surfaces of the sealing element, which are abutted against the first sealing flange and the second sealing flange, have radians which are matched with the first sealing flange and the second sealing flange.

Further, the first elastic piece is arranged between the sealing gasket and the core body, one end of the first elastic piece abuts against the sealing gasket, and the other end of the first elastic piece abuts against the core body.

Further, an outer positioning groove is formed in the inner surface of the sealing gasket, and an inner positioning groove is formed in the outer peripheral surface of the core body; the outer positioning groove is opposite to the inner positioning groove; one end of the first elastic piece is positioned in the outer positioning groove, and the other end of the first elastic piece is positioned in the inner positioning groove.

Further, the plunger also comprises a guide piece, and a guide hole extending inwards in the radial direction is formed in the outer circumferential surface of the core body; one end of the guide piece can be radially movably inserted into the guide hole, and the other end of the guide piece is fixedly connected with the sealing gasket.

Further, the first elastic member is located between the guide hole and the annular receiving groove in the axial direction.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following description briefly describes the drawings that need to be used in the embodiments. It is appreciated that the following drawings depict only certain embodiments of the application and are not to be considered limiting of its scope. Other figures can be obtained from these figures without inventive effort for the person skilled in the art.

Fig. 1 is a schematic view of the external structure of a plunger according to embodiment 1 of the present application;

fig. 2 is a schematic view of the outer structure of a sealing gasket in the plunger according to embodiment 1 of the present application;

fig. 3 is a schematic view of the inner side structure of a sealing gasket in the plunger according to embodiment 1 of the present application;

fig. 4 is a schematic cross-sectional view of a plunger according to embodiment 1 of the present application;

FIG. 5 is a schematic flow diagram of a fluid in the event of a plunger leak as described in example 1;

FIG. 6 is a schematic view of another fluid flow when the plunger described in example 1 is missing;

fig. 7 is a schematic view of the external structure of the plunger according to embodiment 2 of the present application;

FIG. 8 is a cross-sectional view taken along A-A of FIG. 7;

FIG. 9 is a B-B cross-sectional view of FIG. 7;

fig. 10 is an enlarged view at C of fig. 8.

In the figure: 010-plungers; 020-a plunger; 110-core; 110 b-an annular receiving groove; 111-end; 112-positioning the groove; 113-a guide hole; 120-sealing gaskets; 121-a first protrusion; 121 A-A first notch; 122-a second protrusion; 122 A-A second notch; 123-an arcuate body; 123 a-circumferential side; 123 b-circumferential side; 123 c-an outer positioning groove; 123 d-guide; 130-a first elastic member; 140-a first sealing flange; 150-a second sealing flange; 160-shim gap; 161-transverse section; 162-upper longitudinal section; 163-lower longitudinal section; 171-a first receiving hole; 172-a second receiving hole; 180-elastic sealing mechanism; 181-seals; 181 a-positioning holes; 182-a second elastic member.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. It will be apparent that the described embodiments are some, but not all, of the embodiments of the present application.

Thus, the following detailed description of the embodiments of the present application is not intended to limit the scope of the application, as claimed, but is merely representative of some embodiments of the application. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.

It should be noted that, under the condition of no conflict, the embodiments and features and technical solutions in the embodiments may be combined with each other.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

In the description of the present application, it should be noted that, the terms "upper", "lower", and the like indicate an azimuth or a positional relationship based on the azimuth or the positional relationship shown in the drawings, or an azimuth or a positional relationship conventionally put in use of the inventive product, or an azimuth or a positional relationship conventionally understood by one skilled in the art, such terms are merely for convenience of describing the present application and simplifying the description, and do not indicate or imply that the apparatus or element to be referred must have a specific azimuth, be configured and operated in a specific azimuth, and thus should not be construed as limiting the present application.

In the description of this application, an "oil and gas well" may refer to an oil well as a natural gas well. When the "oil and gas well" is a natural gas well, it may be a natural gas well for the production of conventional natural gas or a natural gas well for the production of unconventional natural gas (shale gas, coalbed gas, etc.).

Example 1:

fig. 1 is a schematic view of the external structure of the plunger 010 provided in the present embodiment. Fig. 2 is a schematic view showing the outer structure of the sealing gasket 120 in the plunger 010 according to the present embodiment. Fig. 3 is a schematic view of the inner structure of the sealing gasket 120 in the plunger 010 according to the present embodiment. Fig. 4 is a schematic cross-sectional structure of the plunger 010 according to the present embodiment.

Referring to fig. 1-4 in combination, in the present embodiment, the plunger 010 includes a core 110, a sealing gasket 120, a first elastic member 130, a first sealing flange 140, and a second sealing flange 150.

The core 110 has a columnar shape, and ends 111 are connected to both ends of the core 110. In this embodiment, the end 111 is provided with a threaded hole, and both ends of the core 110 are provided with external threads. The two ends of the core 110 are respectively inserted into threaded holes formed in the two ends 111, and are screwed with the ends 111. The two ends 111 form an accommodating space around the core 110 therebetween. A plurality of sealing gaskets 120 are disposed in the accommodation space and are disposed around the core 110. An annular receiving groove 110b extending in the circumferential direction of the core 110 is formed in the outer circumferential surface of the core 110.

The gasket 120 includes an arcuate body 123 surrounding the core 110. The axis of the radially inner surface of the arcuate body 123 is parallel to the axis of the core 110. The radially inner surface of the arcuate body 123 has a diameter slightly greater than the diameter of the core 110. The circumferentially arcuate body 123 has a circumferential side 123a and a circumferential side 123b. The circumferential side 123a and the circumferential side 123b are end surfaces of both ends of the arc-shaped body 123 in the circumferential direction. The upper portion of the circumferential side 123a extends in the circumferential direction to form a first protrusion 121, and a space below the first protrusion 121 forms a second notch 122a. The circumferential side 123b extends in the circumferential direction to form a second convex portion 122, and the second convex portion 122 is located below the first convex portion 121. The space above the second protrusion 122 forms a first notch 121a. The first protrusion 121 is complementary to the first notch 121a, and the second protrusion 122 is complementary to the second notch 122a. A plurality of sealing gaskets 120 are disposed in the accommodation space and are disposed around the core 110. The first protrusion 121 of one gasket 120 is located in the first notch 121a of the adjacent other gasket 120 and the second protrusion 122 of one gasket 120 is located in the second notch 122a of the adjacent other gasket 120. In the first protrusion 121 and the second protrusion 122 adjacent to each other in the up-down direction, a lower edge of the first protrusion 121 is slidably engaged with an upper edge of the second protrusion 122, or a minute gap is provided so that the gasket 120 can reciprocate in the radial direction.

The first elastic member 130 acts on the sealing gasket 120 such that the sealing gasket 120 has a tendency to move radially outwardly. Under the action of no external force, the first elastic member 130 drives the sealing gasket 120 to move radially outwards. The first elastic member 130 is capable of moving radially inward against the elastic force of the first elastic member 130 under the action of radially inward external force. In the present embodiment, the first elastic member 130 is a spring, and is disposed between the sealing gasket 120 and the core 110. One end of the first elastic member 130 abuts against the sealing gasket 120, and the other end of the first elastic member 130 abuts against the core 110. Specifically, an outer positioning groove 123c is formed in the inner surface of the arc-shaped body 123, and an inner positioning groove 112 facing the outer positioning groove 123c is formed in the outer circumferential surface of the core 110. Both ends of the first elastic member 130 are located in the outer and inner positioning grooves 123c and 112, respectively. Further, in order to ensure that the sealing gasket 120 can accurately reciprocate in the radial direction, the sealing gasket 120 is prevented from moving in the circumferential direction or the axial direction as much as possible during the working process, and in this embodiment, a guide 123d is further provided. The guide 123d is cylindrical, is fixed to the inner surface of the arc-shaped body 123, and extends radially inward. The outer circumferential surface of the core 110 is provided with guide holes 113 extending radially inward. The guide 123d is inserted into the guide hole 113 and slidably engaged with the guide hole 113.

Further, in the present embodiment, the first elastic member 130 is located between the guide hole 113 and the annular receiving groove 110b in the axial direction. Since the first sealing flange 140 and the second sealing flange 150 can perform a certain guiding function in cooperation with the annular receiving groove 110b, the guiding member 123d can perform a guiding function in cooperation with the guiding hole 113, so that the first elastic member 130 is axially disposed between the guiding hole 113 and the annular receiving groove 110b, and the stress of the sealing gasket 120 is more uniform during radial movement.

The inner surface of the gasket 120 projects radially inwardly to form a first sealing flange 140 and a second sealing flange 150. The first sealing flange 140 extends to the arc-shaped body 123 along the lower edge of the first protrusion 121, and the second sealing flange 150 extends to the arc-shaped body 123 along the upper edge of the second protrusion 122. The first sealing flange 140 overlaps the second sealing flange 150 at the arcuate body 123. Further, the first sealing flange 140 extends from an end of the first protrusion 121 circumferentially away from the arc-shaped body 123 to an end of the arc-shaped body 123 circumferentially away from the first protrusion 121. The second sealing flange 150 extends from an end of the second protrusion 122 circumferentially away from the arc-shaped body 123 to an end of the arc-shaped body 123 circumferentially away from the second protrusion 122. The first sealing flange 140 and the second sealing flange 150 are radially movably inserted into the annular receiving groove 110b.

In the working process of the plunger 010 provided in this embodiment, the first sealing flange 140 and the second sealing flange 150 are always inserted into the annular accommodating groove 110b, so that the fluid flow between the sealing gasket 120 and the core 110 is restricted, the sealing performance is improved, and the liquid accumulation lifting efficiency is improved. In addition, the first protrusion 121 of one gasket 120 is positioned in the first notch 121a of the adjacent other gasket 120, and the second protrusion 122 of one gasket 120 is positioned in the second notch 122a of the adjacent other gasket 120, such that a folded gasket gap 160 can be formed between the adjacent gaskets 120, the folded gasket gap 160 including a transverse section 161 defined by the lower edge of the first protrusion 121 and the upper edge of the second protrusion 122 together, an upper longitudinal section 162 defined by the circumferential side of the first protrusion 121 and the circumferential side of the arcuate body 123 of the adjacent gasket 120, and a lower longitudinal section 163 defined by the circumferential side of the second protrusion 122 and the circumferential side of the arcuate body 123 of the adjacent gasket 120. Since the gasket 120 moves only radially during operation and only moves circumferentially between the lower edge of the first protrusion 121 and the upper edge of the second protrusion 122, the distance between the lower edge of the first protrusion 121 and the upper edge of the second protrusion 122 can be set as small as possible and the width of the transverse section 161 can be as small as possible. The bent gasket gaps 160 and the transverse sections 161 with small widths can greatly reduce the fluid flow between the sealing gaskets 120, thereby being beneficial to improving the sealing performance and improving the liquid accumulation lifting efficiency.

Example 2:

fig. 5 is a schematic diagram showing a fluid flow direction when the plunger 010 leaks, which is described in example 1, and the dashed line shows the fluid flow direction. Referring to fig. 5, in the operation of the plunger 010 described in embodiment 1, after the fluid enters the upper longitudinal section 162 formed between the adjacent two sealing gaskets 120, the fluid can enter the annular accommodating groove 110b through the gap between the first sealing flanges 140 of the adjacent two sealing gaskets 120 and flow along the annular accommodating groove 110b, then enter the lower longitudinal section 163 in the same gasket gap 160 through the gap between the second sealing flanges 150 of the adjacent two sealing gaskets 120, and be discharged outside the plunger 010 through the lower longitudinal section 163. After the fluid enters the lower longitudinal section 163 formed between the adjacent two sealing gaskets 120, it can enter the annular receiving groove 110b through the gap between the second sealing flanges 150 of the adjacent two sealing gaskets 120 and flow along the annular receiving groove 110b, then enter the upper longitudinal section 162 in the same gasket gap 160 through the gap between the first sealing flanges 140 of the adjacent two sealing gaskets 120 and be discharged outside the plunger 010 through the upper longitudinal section 162. The above-described situation reduces the sealing performance of the plunger 010, resulting in partial leakage.

Fig. 6 is a schematic diagram showing another fluid flow direction when the plunger 010 leaks, which is described in example 1, and the broken line shows the fluid flow direction. Referring to fig. 6, in the operation of the plunger 010 provided in embodiment 1, after the fluid enters the upper longitudinal section 162 formed between the adjacent two sealing gaskets 120, the fluid can enter the annular accommodating groove 110b through the gap between the first sealing flanges 140 of the adjacent two sealing gaskets 120 and flow along the annular accommodating groove 110b, and then enter the lower longitudinal section 163 through the space between the second sealing flanges 150 at both sides of the adjacent gasket gap 160 and be discharged outside the plunger 010 through the lower longitudinal section 163. After the fluid enters the lower longitudinal section 163 formed between the adjacent two sealing gaskets 120, it can enter the annular receiving groove 110b through the gap between the second sealing flanges 150 of the adjacent two sealing gaskets 120 and flow along the annular receiving groove 110b, then enter the upper longitudinal section 162 through the space between the first sealing flanges 140 at both sides of the adjacent gasket gap 160 and be discharged outside the plunger 010 through the upper longitudinal section 162. The above-described situation reduces the sealing performance of the plunger 010, resulting in partial leakage.

In order to improve the above-described problem, the present embodiment provides a plunger 020. Fig. 7 is a schematic view showing the external structure of the plunger 020 according to the present embodiment. Fig. 8 is a cross-sectional view taken along A-A of fig. 7. Fig. 9 is a B-B cross-sectional view of fig. 7. Fig. 10 is an enlarged view at C of fig. 8. Referring to fig. 7 to 10, the plunger 020 of the present embodiment is substantially the same as the plunger 010 of the embodiment 1, except that the plunger 020 of the present embodiment further includes a first accommodating hole 171, a second accommodating hole 172, and an elastic sealing mechanism 180.

The annular receiving groove 110b is provided at an inner circumferential surface thereof with a first receiving hole 171 extending radially inward; of the adjacent two sealing gaskets 120, the overlapping portion of the first sealing flange 140 of one sealing gasket 120 and the second sealing flange 150 of the other sealing gasket 120 is opposite to the first accommodating hole 171; an elastic sealing mechanism 180 is disposed in the first accommodating hole 171, and the elastic sealing mechanism 180 abuts against the first sealing flange 140 and the second sealing flange 150. Through the elastic sealing mechanism 180 which is always propped against the first sealing flange 140 and the second sealing flange 150, the continuous annular accommodating groove 110b is broken into a plurality of parts, so that in the same gasket gap 160, the upper longitudinal section 162 and the lower longitudinal section 163 cannot be communicated with each other through the annular accommodating groove 110b, the fluid leakage amount of the plunger 020 in the working process is greatly reduced, the sealing performance of the plunger 020 is improved, and the accumulated liquid lifting efficiency can be improved.

The inner circumferential surface of the annular receiving groove 110b is provided with a second receiving hole 172 extending radially inward; the second receiving hole 172 is opposite to the overlapping portion of the first sealing flange 140 and the second sealing flange 150 in the sealing gasket 120; the second accommodating hole 172 is provided therein with an elastic sealing mechanism 180, and the elastic sealing mechanism 180 abuts against the first sealing flange 140 and the second sealing flange 150. The continuous annular receiving groove 110b is broken into a plurality of portions by the elastic sealing mechanism 180 which always abuts the first sealing flange 140 and the second sealing flange 150 such that fluid in the upper longitudinal section 162 of one gasket gap 160 cannot enter the lower longitudinal section 163 of the adjacent other gasket gap 160 through the annular receiving groove 110b and such that fluid in the lower longitudinal section 163 of one gasket gap 160 cannot enter the upper longitudinal section 162 of the adjacent other gasket gap 160 through the annular receiving groove 110b. The amount of fluid leakage of the plunger 020 in the working process is greatly reduced, the sealing performance of the plunger 020 is improved, and the liquid accumulation lifting efficiency can be improved.

In the present embodiment, the elastic sealing mechanism 180 includes a sealing member 181 and a second elastic member 182. When the elastic sealing mechanism 180 is disposed in the first accommodating hole 171, one end of the second elastic member 182 abuts against the bottom of the first accommodating hole 171, and the other end of the second elastic member 182 abuts against the sealing member 181. The sealing member 181 is slidably engaged with the first receiving hole 171. Under the action of the second elastic member 182, the sealing member 181 is always abutted against the first sealing flange 140 and the second sealing flange 150. When the elastic sealing mechanism 180 is disposed in the second accommodating hole 172, one end of the second elastic member 182 abuts against the bottom of the second accommodating hole 172, and the other end of the second elastic member 182 abuts against the sealing member 181. The seal 181 is slidably engaged with the second receiving hole 172. Under the action of the second elastic member 182, the sealing member 181 is always abutted against the first sealing flange 140 and the second sealing flange 150.

Further, in this embodiment, the sealing member 181 has a columnar shape, one end face of the sealing member 181 abuts against the first sealing flange 140 and the second sealing flange 150, the other end face of the sealing member 181 is provided with a positioning hole 181a, and one end of the second elastic member 182 is located in the positioning hole 181 a. This can reduce the radial dimension of the elastic sealing mechanism 180, and thus reduce the radial length of the first receiving hole 171 and the second receiving hole 172, contributing to the increased strength of the core 110.

In this embodiment, the core 110 is provided with a first accommodating hole 171 and a second accommodating hole 172. It will be appreciated that in other embodiments, only the first receiving hole 171, or only the second receiving hole 172 may be provided.

In the present embodiment, the end surfaces of the sealing member 181 abutting against the first sealing flange 140 and the second sealing flange 150 are plane. In other embodiments, the seal 181 may be disposed against the end surfaces of the first and second sealing flanges 140 and 150 in surface contact with the first and second sealing flanges 140 and 150 to improve sealing performance. In particular, the end surfaces of the seal 181 against the first and second sealing flanges 140 and 150 may be provided in an arc shape, and the end surfaces have an arc shape corresponding to the first and second sealing flanges 140 and 150.

The foregoing is only a few examples of the present application and is not intended to limit the present application, and various modifications and variations may be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A plunger, comprising:

the cylindrical core body, the peripheral surface of the said core body has annular holding grooves extending along circumference;

a sealing gasket, the sealing gasket comprises an arc-shaped main body surrounding the core body, wherein the upper part of one circumference side of the arc-shaped main body extends along the circumferential direction to form a first convex part, a second notch is formed below the first convex part, the other circumference side of the arc-shaped main body extends along the circumferential direction to form a second convex part positioned below the first convex part, and a first notch is formed above the second convex part; the first notch is complementary to the first protrusion, and the second notch is complementary to the second protrusion; a plurality of said sealing gaskets disposed about said core and configured for radial reciprocal movement;

a first resilient member acting on the gasket and configured to impart a radially outward movement tendency to the gasket;

a first sealing flange and a second sealing flange projecting radially inwardly from an inner surface of the sealing gasket, the first sealing flange extending along a lower edge of the first boss to the arcuate body, the second sealing flange extending along an upper edge of the second boss to the arcuate body, the first and second sealing flanges overlapping at the arcuate body;

wherein the first protrusion of one of the sealing gaskets is located in the first notch of the adjacent other sealing gasket; the second convex part of one sealing gasket is positioned in a second notch of the other adjacent sealing gasket; the first sealing flange and the second sealing flange are inserted into the annular accommodating groove in a radial movable way;

the inner peripheral surface of the annular accommodating groove is provided with a first accommodating hole extending radially inwards; the overlapping part of the first sealing flange of one sealing gasket and the second sealing flange of the other sealing gasket is opposite to the first accommodating hole in the two adjacent sealing gaskets;

an elastic sealing mechanism is arranged in the first accommodating hole and abuts against the first sealing flange and the second sealing flange;

the inner peripheral surface of the annular accommodating groove is provided with a second accommodating hole extending radially inwards; the second accommodating hole is opposite to the overlapping part of the first sealing flange and the second sealing flange in the sealing gasket;

an elastic sealing mechanism is arranged in the second accommodating hole and abuts against the first sealing flange and the second sealing flange.

2. The plunger of claim 1, wherein:

the elastic sealing mechanism comprises a second elastic piece and a sealing piece; the second elastic piece is propped against the sealing piece, so that the sealing piece is propped against the first sealing flange and the second sealing flange.

3. The plunger of claim 2, wherein:

the sealing element is columnar, one end face of the sealing element abuts against the first sealing flange and the second sealing flange, a positioning hole is formed in the other end face of the sealing element, and one end of the second elastic element is located in the positioning hole.

4. A plunger according to claim 3, wherein:

the seal member abuts against end surfaces of the first seal flange and the second seal flange to be in surface contact with the first seal flange and the second seal flange.

5. The plunger of claim 4, wherein:

the end surfaces of the sealing piece, which are propped against the first sealing flange and the second sealing flange, are provided with radians which are matched with the first sealing flange and the second sealing flange.

6. The plunger of claim 1, wherein:

the first elastic piece is arranged between the sealing gasket and the core body, one end of the first elastic piece abuts against the sealing gasket, and the other end of the first elastic piece abuts against the core body.

7. The plunger of claim 6, wherein:

an outer positioning groove is formed in the inner surface of the sealing gasket, and an inner positioning groove is formed in the outer peripheral surface of the core body; the outer positioning groove is opposite to the inner positioning groove; one end of the first elastic piece is positioned in the outer positioning groove, and the other end of the first elastic piece is positioned in the inner positioning groove.

8. The plunger of claim 1, wherein:

the plunger also comprises a guide piece, and a guide hole extending inwards in the radial direction is formed in the outer circumferential surface of the core body; one end of the guide piece can be radially movably inserted into the guide hole, and the other end of the guide piece is fixedly connected with the sealing gasket.

9. The plunger of claim 8, wherein:

the first elastic piece is located between the guide hole and the annular accommodating groove along the axial direction.