阅读说明：本技术 抽油泵及凡尔结构 (Oil well pump and valve structure ) 是由 卫德义 卫玮 于 2020-04-21 设计创作，主要内容包括：本公开提供一种抽油泵及凡尔结构,涉及石油开采技术领域。该凡尔结构包括凡尔罩、凡尔座、第一密封圈、凡尔球和导向柱。凡尔罩具有贯通的第一开放端和第二开放端,第一开放端内具有凸台,第二开放端内设有固定部,固定部设有沿凡尔罩的轴向贯通的导向孔；凡尔座的两端贯通,一端延伸至第一开放端内并与凸台抵接,凡尔座的外周面具有第一环槽,第一环槽由凡尔座的外周面沿径向向内凹陷；第一密封圈卡设于第一环槽内,与凡尔罩的内周面密封配合；凡尔球设于凡尔罩内,包括底面和侧面,侧面与凡尔座的顶端部活动抵接,底面朝向第二开放端；导向柱具有第一端和第二端,第一端滑动的穿过导向孔,第二端穿过凡尔球并向凡尔座远离凸台的一侧延伸。(The utility model provides an oil-well pump and valve structure relates to oil development technical field. The valve structure comprises a valve cover, a valve seat, a first sealing ring, a valve ball and a guide post. The valve cover is provided with a first open end and a second open end which are communicated, a boss is arranged in the first open end, a fixing part is arranged in the second open end, and the fixing part is provided with a guide hole which is communicated along the axial direction of the valve cover; the two ends of the valve seat are communicated, one end of the valve seat extends into the first open end and is abutted against the boss, a first annular groove is formed in the peripheral surface of the valve seat, and the first annular groove is inwards recessed from the peripheral surface of the valve seat along the radial direction; the first sealing ring is clamped in the first annular groove and is in sealing fit with the inner circumferential surface of the valve cover; the valve ball is arranged in the valve cover and comprises a bottom surface and a side surface, the side surface is movably abutted against the top end part of the valve seat, and the bottom surface faces the second open end; the guide post has first end and second end, and the gliding guiding hole that passes of first end, and the second end passes the valve ball and extends to one side that the boss was kept away from to the valve seat.)

1. A valve structure, comprising:

the valve cover is provided with a first open end and a second open end which are communicated, a boss which is arranged in the inner wall of the first open end in a surrounding mode is arranged in the first open end, a fixing portion is arranged in the second open end, and the fixing portion is provided with a guide hole and an oil passing hole which are communicated in the axial direction of the valve cover;

the two ends of the valve seat are communicated, one end of the valve seat extends into the first open end of the valve cover and is abutted against the boss, the outer peripheral surface of the valve seat is provided with a first annular groove, and the first annular groove is inwards recessed from the outer peripheral surface of the valve seat along the radial direction;

the first sealing ring is clamped in the first annular groove and is in sealing fit with the inner circumferential surface of the valve cover;

the valve ball is arranged in the valve cover and comprises a bottom surface and a side surface surrounding the bottom surface, the side surface is movably abutted with the top end part of the valve seat, and the bottom surface faces the second open end;

the guide post is provided with a first end and a second end, the first end can slidably penetrate through the guide hole, and the second end penetrates through the valve ball and extends towards one side, away from the boss, of the valve seat.

2. A valve structure as claimed in claim 1, wherein there are a plurality of first ring grooves, and a plurality of first sealing rings, and each first sealing ring is correspondingly engaged with each first ring groove.

3. A valve structure according to claim 1, further comprising:

and the balancing weight is fixedly connected with the guide post and is positioned on one side of the valve ball, which is far away from the guide hole.

4. The valve structure as claimed in claim 3, wherein the weight member is sleeved outside the second end of the guide post, the outer surface of the second end of the guide post has external threads, the inner surface of the weight member has internal threads, and the internal threads and the external threads are matched with each other to connect the weight member and the second end of the guide post through threads.

5. A valve structure according to claim 3, further comprising:

one end of the connecting rod is connected to the second end of the guide post and is hinged with the second end of the guide post; the balancing weight is fixed on the end part, far away from the second end, of the connecting rod.

6. The valve structure of claim 5 wherein the weight is of unitary construction with the connecting rod.

7. A valve structure according to any one of claims 1 to 6, wherein the guide post has a second annular groove formed in its outer peripheral surface, the second annular groove being recessed radially inwardly from the outer peripheral surface of the guide post;

the valve structure further comprises a second sealing ring, and the second sealing ring is embedded in the second annular groove and is in sealing fit with the valve ball.

8. The valve structure of claim 7, further comprising:

the pressing sleeve is slidably sleeved on the guide post and is positioned on one side, close to the first end, of the bottom surface of the valve ball;

the sealing element is sleeved outside the guide post and positioned between the pressing sleeve and the bottom surface of the valve ball, and the edge of the sealing element is provided with a flange which surrounds the bottom surface and abuts against the end part of the valve cover.

9. A valve structure according to claim 7, wherein the first and second sealing rings are both of an elastomeric material.

10. An oil-well pump, its characterized in that includes:

a pump barrel having an oil inlet end and an oil outlet end;

the piston is slidably arranged in the pump cylinder;

the valve structure of any one of claims 1 to 9, which is disposed in the pump barrel, and the second open end of the valve cover of the valve structure is axially and fixedly abutted against the oil inlet end of the pump barrel.

Technical Field

The disclosure relates to the technical field of oil exploitation, in particular to an oil well pump and a valve structure.

Background

The oil well pump is indispensable equipment in the oil exploitation process, and can lift crude oil in the well to the ground. The existing oil well pump generally adopts a valve to realize the one-way flow of petroleum, and the valve is a valve. The existing valve is usually opened and closed by contacting or separating a valve ball arranged in a valve cover with a valve seat. However, an assembly gap exists between the valve cover and the valve seat, and in the crude oil lifting process, the oil leakage phenomenon occurs at the periphery of the valve seat under the action of oil pressure, so that the oil extraction efficiency is influenced.

It is to be noted that the information disclosed in the above background section is only for enhancement of understanding of the background of the present disclosure, and thus may include information that does not constitute prior art known to those of ordinary skill in the art.

Disclosure of Invention

The present disclosure aims to overcome the defects of the prior art, and the present disclosure aims to provide an oil well pump and a valve structure, which can prevent oil leakage and improve oil extraction efficiency.

According to one aspect of the present disclosure, there is provided a valve structure comprising:

the valve cover is provided with a first open end and a second open end which are communicated, a boss which is arranged in the inner wall of the first open end in a surrounding mode is arranged in the first open end, a fixing portion is arranged in the second open end, and the fixing portion is provided with a guide hole and an oil passing hole which are communicated in the axial direction of the valve cover;

the two ends of the valve seat are communicated, one end of the valve seat extends into the first open end of the valve cover and is abutted against the boss, the outer peripheral surface of the valve seat is provided with a first annular groove, and the first annular groove is inwards recessed from the outer peripheral surface of the valve seat along the radial direction;

the first sealing ring is clamped in the first annular groove and is in sealing fit with the inner circumferential surface of the valve cover;

the valve ball is arranged in the valve cover and comprises a bottom surface and a side surface surrounding the bottom surface, the side surface is movably abutted with the top end part of the valve seat, and the bottom surface faces the second open end;

the guide post is provided with a first end and a second end, the first end can slidably penetrate through the guide hole, and the second end penetrates through the valve ball and extends towards one side, away from the boss, of the valve seat.

In an exemplary embodiment of the disclosure, the number of the first ring grooves is multiple, the number of the first sealing rings is multiple, and the first sealing rings are correspondingly clamped in the first ring grooves one to one.

In an exemplary embodiment of the present disclosure, the valve structure further includes:

and the balancing weight is fixedly connected with the guide post and is positioned on one side of the valve ball, which is far away from the guide hole.

In an exemplary embodiment of the present disclosure, the counterweight block is sleeved outside the second end of the guide post, an external thread is disposed on an outer surface of the second end of the guide post, an internal thread is disposed on an inner surface of the counterweight block, and the internal thread and the external thread are matched with each other, so that the counterweight block is connected with the second end of the guide post through the thread.

In an exemplary embodiment of the present disclosure, the valve structure further includes:

one end of the connecting rod is connected to the second end of the guide post and is hinged with the second end of the guide post; the balancing weight is fixed on the end part, far away from the second end, of the connecting rod.

In an exemplary embodiment of the present disclosure, the weight block and the connecting rod are in an integrated structure.

In an exemplary embodiment of the present disclosure, the outer circumferential surface of the guide post is provided with a second ring groove, and the second ring groove is recessed inward in the radial direction from the outer circumferential surface of the guide post;

the valve structure further comprises a second sealing ring, and the second sealing ring is embedded in the second annular groove and is in sealing fit with the valve ball.

In an exemplary embodiment of the present disclosure, the valve structure further includes:

the pressing sleeve is slidably sleeved on the guide post and is positioned on one side, close to the first end, of the bottom surface of the valve ball;

the sealing element is sleeved outside the guide post and positioned between the pressing sleeve and the bottom surface of the valve ball, and the edge of the sealing element is provided with a flange which surrounds the bottom surface and abuts against the end part of the valve cover.

In an exemplary embodiment of the present disclosure, the first sealing ring and the second sealing ring are both made of an elastic material.

According to one aspect of the present disclosure, there is provided an oil well pump comprising:

a pump barrel having an oil inlet end and an oil outlet end;

the piston is slidably arranged in the pump cylinder;

the valve structure is arranged in the pump barrel, and a second open end of a valve cover of the valve structure is fixedly butted with an oil inlet end of the pump barrel along the axial direction.

According to the oil well pump and the valve structure, when oil is pumped, the valve ball moves upwards under the action of the vacuum pumping force, the valve ball is separated from the valve seat, a passage is provided for the circulation of oil, and the oil enters the valve cover; the valve ball moves downwards under the action of oil pressure, and can be abutted against the top end part of the valve seat through the side surface of the valve ball, so that the valve ball and the valve seat are sealed, and the backflow of petroleum along a flow passage is avoided. In the process, the first sealing ring is clamped in the first annular groove and is in sealing fit with the inner circumferential surface of the valve cover, the assembly gap between the inner circumferential surface of the valve cover and the outer circumferential surface of the valve seat can be sealed, the backflow and leakage of oil from the assembly gap between the valve seat and the valve cover can be prevented, and the oil production is improved; in addition, the guide post can guide the valve ball to move along the axial direction of the valve cover, so that the valve ball is prevented from deflecting, the rising and falling drift time of the valve ball is shortened, and the oil extraction efficiency is improved.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure. It is to be understood that the drawings in the following description are merely exemplary of the disclosure, and that other drawings may be derived from those drawings by one of ordinary skill in the art without the exercise of inventive faculty.

Fig. 1 is a schematic diagram of a valve structure according to an embodiment of the present disclosure.

Fig. 2 is an enlarged view of a portion a in fig. 1.

Fig. 3 is an enlarged view of a portion B in fig. 1.

FIG. 4 is a schematic view of a connecting rod according to an embodiment of the present disclosure.

Fig. 5 is a schematic view of an oil well pump according to an embodiment of the present disclosure.

Description of reference numerals:

1. a valve cover; 11. a boss; 12. an oil passing hole; 2. a valve seat; 21. a first ring groove; 22. a first seat body; 23. a second seat body; 231. a first connection portion; 232. a second connecting portion; 3. a first seal ring; 4. a Versailles ball; 41. a side surface; 42. a bottom surface; 5. a guide post; 6. a balancing weight; 61. a connecting rod; 7. a second seal ring; 8. pressing the sleeve; 9. a seal member; 100. a valve structure; 200. a pump barrel.

Detailed Description

Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus their detailed description will be omitted. Furthermore, the drawings are merely schematic illustrations of the present disclosure and are not necessarily drawn to scale.

Although relative terms, such as "upper" and "lower," may be used in this specification to describe one element of an icon relative to another, these terms are used in this specification for convenience only, e.g., in accordance with the orientation of the examples described in the figures. It will be appreciated that if the device of the icon were turned upside down, the element described as "upper" would become the element "lower". When a structure is "on" another structure, it may mean that the structure is integrally formed with the other structure, or that the structure is "directly" disposed on the other structure, or that the structure is "indirectly" disposed on the other structure via another structure.

The terms "a," "an," "the," "said," and "at least one" are used to indicate the presence of one or more elements/components/parts/etc.; the terms "comprising" and "having" are intended to be inclusive and mean that there may be additional elements/components/etc. other than the listed elements/components/etc.; the terms "first," "second," and "third," etc. are used merely as labels, and are not limiting on the number of their objects.

The embodiment of the disclosure provides a valve structure, which can be used for an oil well pump and can be used as a fixed valve or a movable valve. As shown in fig. 1, the valve structure 100 of the embodiment of the present disclosure may include a valve cover 1, a valve seat 2, a first sealing ring 3, a valve ball 4, and a guide post 5, wherein:

the valve cover 1 can be provided with a first open end and a second open end which are communicated, the first open end can be internally provided with a boss 11 which surrounds the inner wall of the first open end, the second open end can be internally provided with a fixing part, and the fixing part is provided with a guide hole which is communicated along the axial direction of the valve cover 1;

the two ends of the valve seat 2 are through, one end of the valve seat can extend into the first open end of the valve cover 1 and is abutted against the boss 11, the outer peripheral surface of the valve seat 2 can be provided with a first annular groove 21, and the first annular groove 21 can be inwards recessed from the outer peripheral surface of the valve seat 2 along the radial direction;

the first sealing ring 3 can be clamped in the first annular groove 21 and can be in sealing fit with the inner circumferential surface of the valve cover 1;

the valve ball 4 can be arranged in the valve cover 1 and comprises a bottom surface and a side surface surrounding the bottom surface, the side surface can be movably abutted with the top end part of the valve seat 2, and the bottom surface can face to the second open end;

the guide post 5 may have a first end slidably passing through the guide hole and a second end passing through the valve ball 4 and extending toward a side of the valve seat 2 away from the boss 11.

According to the oil well pump and the valve structure 100, when oil is pumped, the valve ball 4 moves upwards under the action of the vacuum pumping force, the valve ball 4 is separated from the valve seat 2, a passage is provided for the circulation of oil, and the oil enters the valve cover 1; the valve ball 4 moves downwards under the action of oil pressure, and the side surface of the valve ball 4 can be abutted against the top end part of the valve seat 2, so that the valve ball 4 and the valve seat 2 are sealed, and the backflow of petroleum along a flow passage is avoided. In the process, the first sealing ring 3 is clamped in the first annular groove and is in sealing fit with the inner circumferential surface of the valve cover 1, so that an assembly gap between the inner circumferential surface of the valve cover 1 and the outer circumferential surface of the valve seat 2 can be sealed, the oil can be prevented from flowing back and leaking from the assembly gap between the valve seat 2 and the valve cover 1, and the oil extraction amount is improved; in addition, the guide post 5 can guide the valve ball 4 to move along the axial direction of the valve cover 1, so that the valve ball 4 is prevented from deflecting, the rising and falling drift time of the valve ball 4 is shortened, and the oil extraction efficiency is improved.

The following provides a detailed description of the various portions of the valve structure 100 of the disclosed embodiment:

as shown in fig. 1, the valve cover 1 may be a tubular structure with two through ends, one end of which is a first open end, and the other end of which is a second open end. The cross section of the inner circumferential surface of the valve cover 1 may be circular, oval, rectangular, irregular, or the like, and is not particularly limited. Preferably, the inner circumferential surface of the valve cover 1 has a circular cross section.

The inner wall of the first open end may have a boss 11 therein, and the boss 11 may be annular and may be coaxially disposed with the inner circumferential surface of the first open end. The boss 11 may be integrally formed with the first open end of the valve cover 1, and may also be welded to the first open end or fixedly connected by a bolt, or may also be fixedly connected by other manners, which is not limited herein. The boss 11 may be a circular truncated cone, a truncated pyramid, or a tapered frustum, but may have other shapes, which are not listed here.

The second open end is provided with a fixing part which can be integrally formed with the second open end of the valve cover 1. Meanwhile, the fixing part is provided with a guide hole and an oil passing hole 12 which are communicated along the axial direction of the valve cover 1. The guide hole may be located at the center of the fixing portion, the oil passing holes 12 may be located at the periphery of the guide hole, and the number of the oil passing holes 12 may be plural, for example, it may be 2, 3, 4 or 5, of course, other numbers may also be possible, and is not particularly limited herein. It should be noted that the oil passing holes 12 may be uniformly distributed around the pilot hole.

As shown in fig. 1, the valve seat 2 may have a bottom end portion and a top end portion, wherein the top end portion may extend into the first open end of the valve cover 1 and abut against a side of the boss 11 away from the second open end. The valve seat 2 may be a cylindrical structure, and the cross section thereof may be circular or elliptical, or may be in other shapes, which is not limited herein. In order to reduce the assembly gap between the valve cover 1 and the valve seat 2, the cross-sectional shape of the outer circumferential surface of the valve seat 2 may be the same as the cross-sectional shape of the inner circumferential surface of the valve cover 1, for example, the cross-sectional shape of the outer circumferential surface of the valve seat 2 is circular, the cross-sectional shape of the inner circumferential surface of the valve cover 1 is circular, and the diameter of the inner circumferential surface of the valve cover 1 may be slightly larger than the diameter of the outer circumferential surface of the tip end portion of the valve seat 2, so that the tip end portion of the valve seat 2 can be inserted into the first open end of the valve cover 1 and screwed into the inner circumferential surface of the valve cover 1.

In one embodiment, the valve seat 2 may be formed by a plurality of seat bodies axially distributed in a butt joint manner, and each seat body is through. For example, as shown in fig. 1, the valve seat 2 may include a first seat 22 and a second seat 23, wherein:

the first seat 22 and the second seat 23 may be both cylindrical structures with two ends penetrating, but the inner diameters of the two seats may be different. The first seat 22 can extend into the valve cover 1 and can abut against one side of the boss 11 away from the second open end of the valve cover 1, one end of the second seat 23 abuts against the first seat 22 so as to limit the valve seat 2, and the other end extends out of the valve cover 1 toward one side of the first seat 22 away from the second open end of the valve cover 1. The second seat 23 may include a first connecting portion 231 and a second connecting portion 232 that are butted against each other, the first connecting portion 231 may abut against the first seat 22, and an inner diameter of the first connecting portion 231 may be smaller than an inner diameter of the second connecting portion 232. One end of the first seat 22 away from the second seat 23 belongs to the top end of the valve seat 2, and the second connecting portion 232 of the second seat 23 belongs to the bottom end of the valve seat 2.

The outer diameter of the valve seat 2 can be in sealing fit with the inner wall of the valve cover 1, as shown in fig. 2, the outer peripheral surface of the valve seat 2 can be provided with a first annular groove 21, the first annular groove 21 can be coaxially arranged with the valve seat 2 and can be located on the outer peripheral surface of the valve seat 2, and the first annular groove 21 can be recessed inwards from the outer peripheral surface of the valve seat 2 along the radial direction. The first sealing ring 3 can be clamped in the first annular groove 21 and can be in sealing fit with the inner circumferential surface of the valve cover 1. The first sealing ring 3 may be made of an elastic material, for example, rubber, and the like, and is not particularly limited. The first sealing ring 3 can protrude out of the opening of the first annular groove 21, and the part protruding out of the opening can be abutted against the inner circumferential surface of the valve cover 1, so that the assembly gap between the valve cover 1 and the valve seat 2 can be conveniently sealed, further, the oil is prevented from leaking from the assembly gap between the valve cover 1 and the valve seat 2, and the oil extraction amount is improved.

In order to further improve the sealing effect, a plurality of sealing processes can be carried out on the assembly gap between the valve cover 1 and the valve seat 2. For example, a plurality of first ring grooves 21 may be formed on the outer circumference of the valve seat 2. The number of the first sealing rings 3 may also be the same as that of the first ring grooves 21, and each of the first sealing rings 3 may be correspondingly clamped in each of the first ring grooves 21. For example, the number of the first ring grooves 21 and the first seal rings 3 may be 1, 2, 3, 4 or 5, or other numbers, which are not listed here.

As shown in fig. 1 to 3, the valve ball 4 is disposed in the valve cover 1, and may be a solid of revolution, and includes a bottom surface 42 and a side surface 41, the bottom surface 42 may be a plane, and the side surface 41 may surround the bottom surface 42 for a circle. For example, the valve ball 4 may be a segment structure, the bottom surface 42 of the segment structure is the bottom surface 42 of the valve ball, and the spherical cap of the segment structure is the side surface 41; of course, the valve ball 4 may have other shapes, for example, it may have a conical structure, the bottom surface 42 of the conical structure is the bottom surface 42 of the valve ball, and the tapered surface of the cylindrical structure is the side surface 41 of the valve ball.

The valve ball 4 is movably arranged in the valve cover 1 and can move up and down along the axial direction of the valve cover 1 along with the flowing state of the petroleum. The side surface 41 of the valve ball can movably abut against the top end part of the valve seat 2, and the bottom surface 42 is larger than the inner diameter of the top end part of the valve seat 2 and faces the second open end of the valve cover 1 to prevent the valve ball 4 from sliding into the valve seat 2. When the side surface 41 abuts against the top end of the valve seat 2, the top end of the valve seat 2 can be closed to block the oil from flowing through, and when the side surface 41 is separated from the top end, the top end can be opened to allow the oil to flow through.

As shown in fig. 1, the guide post 5 may be a column and may have a first end and a second end, the first end may slidably pass through the guide hole of the fixing portion, so that the guide post 5 may reciprocate along the guide hole to guide the movement of the valve ball 4, thereby guiding the valve ball 4 to move along the axial direction of the valve cover 1, and preventing the valve ball 4 from deflecting during the movement and being unable to be in sealing contact with the valve seat 2. The second end may extend through the valve ball 4 and extend towards a side of the valve seat 2 remote from the boss 11.

The guide post 5 can be in sealing fit with the valve ball 4, for example, the outer circumferential surface of the guide post 5 can be provided with a second ring groove, the second ring groove can be coaxially arranged with the guide post 5 and can be located on the contact surface of the guide post 5 and the valve ball 4, and the second ring groove can be recessed inwards along the radial direction from the outer circumferential surface of the guide post 5. As shown in fig. 3, the second sealing ring 7 can be embedded in the second ring groove and can be in sealing engagement with the valve ball 4. The second sealing ring 7 may be made of an elastic material, for example, rubber, and the like, and is not particularly limited. The surface of the second sealing ring 7 far away from the bottom of the second annular groove can be in contact with the valve ball 4 so as to seal the contact surface of the guide column 5 and the valve ball 4, prevent the oil from leaking from the contact surface of the guide column 5 and the valve ball 4 and further improve the oil production. It should be noted that, in order to ensure that there is no gap between the guide post 5 and the valve ball 4, the guide post 5 and the valve ball 4 may be of an integral structure.

The second ring groove may be plural, and plural second ring grooves may be arranged side by side in the axial direction of the guide post 5. The number of the second sealing rings 7 can also be the same as that of the second ring grooves, and the second sealing rings 7 can be correspondingly embedded in the second ring grooves one by one. For example, the number of the second ring grooves and the second sealing rings 7 may be 1, 2, 3, 4 or 5, or other numbers, which are not listed here.

The valve structure 100 of the present disclosure may further include a weight block 6, as shown in fig. 1 and 4, the weight block 6 may be fixedly connected to the guide post 5, and may be located on a side of the valve ball 4 away from the guide hole, and the weight block 6 may be made of a metal material with a relatively high density, so as to increase a weight of the valve ball 4, accelerate the downward movement of the valve ball 4, save time, and improve oil extraction efficiency. The weight 6 may be a block-shaped solid structure, for example, it may be a column, a sphere or an irregular shape, and is not limited herein.

In an embodiment, the weight block 6 may be connected to the guide post 5 by a screw, for example, the inner surface of the weight block 6 may be provided with an internal thread, the outer surface of the second end of the guide post 5 may be provided with an external thread, and the weight block 6 may be sleeved outside the second end of the guide post 5, so that the internal thread and the external thread are matched with each other, thereby connecting the weight block 6 to the second end of the guide post 5 by a screw. For example, the weight 6 may be a nut.

In another embodiment, as shown in fig. 4, the valve structure 100 may further include a connecting rod 61, one end of the connecting rod 61 may be connected to the second end of the guiding post 5, for example, the connecting rod 61 may be hinged to the second end of the guiding post 5 to prevent the counterweight 6 from loosening or breaking, the counterweight 6 may be fixed to an end of the connecting rod 61 away from the second end, for example, the connecting rod 61 may be inserted into the counterweight 6, the counterweight 6 may be welded to a side of the connecting rod 61 away from the second end, or the counterweight 6 may be fixed to the connecting rod 61 by other means, which is not further illustrated herein. In order to reduce the contact area between the weight 6 and the outside and reduce the resistance when the weight is lifted or dropped, the weight 6 may be a sphere and may be integrally formed with the connecting rod 61 to prevent the weight 6 from falling off from the connecting rod 61.

The valve structure 100 of the present disclosure may further include a pressing sleeve 8, wherein the pressing sleeve 8 is slidably sleeved on the guide post 5, and may be located on a side of the bottom surface 42 of the valve ball near the first end of the guide post 5. In the oil outlet process, the pressing sleeve 8 can extrude the sealing element 9 to the valve seat 2 under the action of oil pressure so as to realize sealing. The pressing sleeve 8 may be made of metal and have a density and weight greater than that of the sealing member 9 so as to press the sealing member 9.

As shown in fig. 1 and 4, the sealing member 9 is sleeved outside the guide post 5 and located between the pressing sleeve 8 and the bottom surface 42 of the valve ball, and can be pressed by the pressing sleeve 8. The edge of sealing member 9 has the turn-ups that extends to valve seat 2, and the turn-ups can be annular structure, and around outside bottom surface 42, and the turn-ups butt in the top portion of valve seat 2, from realizing sealed cooperation, on the basis that valve ball 4 is sealed with valve seat 2, further seal, promote sealed effect. The sealing member 9 is made of an elastic material, and may be rubber, for example.

In order to improve the sealing effect and facilitate the contact between the flange and the end face of the top end part of the valve seat 2, the surface of the flange close to the top end part of the valve seat 2 can be provided with an annular convex rib which surrounds the bottom surface 42 of the valve ball. The cross section of the annular convex rib can be arc-shaped, namely the surface of the annular convex rib abutted to the top end part is an arc surface, or the cross section of the annular convex rib can also be other figures such as a rectangle. To enhance the sealing effect, the annular ribs may be provided in a plurality and concentrically disposed around the bottom surface 42 to form a plurality of seals to further prevent oil leakage.

When the sealing member 9 is pressed toward the valve seat 2, the annular rib can be tightly fitted to the end surface of the tip end portion of the valve seat 2, and in this case, the annular rib can prevent oil leakage even when the side surface 41 has a gap with the valve seat 2. When the valve ball 4 is pressed towards the second opening end of the valve cover 1, the sealing element 9 can be driven to synchronously move towards the second opening end, and the side surface 41 and the annular convex rib are separated from the valve seat 2, so that the petroleum can enter.

The disclosed embodiment further provides an oil well pump, as shown in fig. 5, the oil well pump includes a pump barrel 200, a piston and a valve structure 100, wherein:

the pump barrel 200 may include an oil inlet end and an oil outlet end, with the piston slidably disposed within the pump barrel 200. The valve structure 100 can be arranged in the pump barrel 200, and when the valve structure is used as a fixed valve, the second open end of the valve cover of the valve structure 100 can be fixedly butted with the oil inlet end of the pump barrel 200 along the axial direction; when it is a floating valve, it can be disposed between the oil inlet end and the oil outlet end of the pump barrel 200, and the structural details and beneficial effects of the valve structure 100 can be found in any of the above embodiments, which are not described herein again.

The oil well pump can be provided with a plurality of valve structures which can be sequentially arranged from bottom to top along the axial direction of the pump barrel 200. For example, it may be 3, respectively a first valve, a second valve and a third valve. At least one of the first valve and the second valve is the valve structure 100 of any of the embodiments described above. If the first valve is the valve structure 100, the second open end of the valve cover 1 of the first valve is fixedly butted with the oil inlet end of the pump cylinder 200 along the axial direction, and the second valve is arranged in the pump cylinder 200; if the second valve is the valve structure 100, the second open end of the valve cover of the second valve is fixedly butted with the piston along the axial direction. The third valve is arranged at the oil outlet end of the pump barrel 200 and is fixedly butted with one end of the piston far away from the oil inlet end.

The first valve, the second valve, and the third valve may be the valve structure 100 of the above embodiment, but the first valve, the second valve, and the third valve may be the valve structures 100 of different embodiments, and are not limited to being completely identical.

The following describes the operation of the oil pump according to the embodiment of the present disclosure:

the pump barrel 200 is vertically arranged on the ground, and the first valve, the second valve and the third valve are arranged from bottom to top. When oil is pumped, the piston moves upwards, the pressure in the pump barrel 200 is reduced, negative pressure is formed, and the valve ball 4 of the first valve is separated from the valve seat 2, so that the oil inlet end is opened, and a passage is provided for the circulation of oil; meanwhile, the valve balls 4 of the second valve and the third valve are both in contact with the corresponding valve seats 2, so that the second valve and the third valve are closed; at this time, oil may enter the pump barrel 200 from the oil inlet end, and oil between the second valve and the third valve is lifted. When the piston moves downwards, the pressure in the pump barrel 200 is increased, the valve ball 4 of the first valve moves downwards under the action of oil pressure, and the side surface 41 of the valve ball is abutted against the top end part of the valve seat 2, so that the valve ball 4 and the valve seat 2 are sealed, and the backflow of oil along a circulation passage is avoided. Meanwhile, the valve balls 4 of the second valve and the third valve are pushed open and separated from the corresponding valve seats 2, so that the second valve and the third valve are opened; at this time, oil can be output from the oil outlet end. In this process, the first seal ring 3 can seal the assembly gap between the inner circumferential surface of the valve cover 1 and the outer circumferential surface of the valve seat 2, thereby preventing oil from flowing back and leaking from the assembly gap between the valve seat 2 and the valve cover 1 and improving oil extraction.

Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.