阅读说明：本技术 抽油泵 (Oil-well pump ) 是由 卫玮 于 2019-10-23 设计创作，主要内容包括：本公开提供一种抽油泵,涉及石油开采技术领域。该抽油泵包括泵筒和柱塞组件,泵筒具有进油端和出油端；柱塞组件包括柱塞和弹性圈。柱塞可滑动的设于泵筒内,且与泵筒的内壁具有间隙,柱塞具有朝向进油端的进口端、朝向出油端的出口端以及连接进口端和出口端的油腔；油腔包括沿轴向分布且相互分隔的第一腔和第二腔,第一腔与进口端连通,第二腔与出口端连通；进口端与泵筒的内壁滑动密封配合；柱塞的外周对应于第一腔的区域设有环形的油槽,油槽的两侧壁向油槽的底部逐渐收缩,且油槽的底部具有与第一腔连通的第一通孔；柱塞的外周对应于第二腔的区域设有与第二腔连通的第二通孔。弹性圈设于油槽内,用于打开或遮蔽第一通孔。(The utility model provides an oil-well pump relates to oil development technical field. The oil well pump comprises a pump cylinder and a plunger assembly, wherein the pump cylinder is provided with an oil inlet end and an oil outlet end; the plunger assembly includes a plunger and a resilient ring. The plunger is arranged in the pump barrel in a sliding manner, a gap is reserved between the plunger and the inner wall of the pump barrel, and the plunger is provided with an inlet end facing the oil inlet end, an outlet end facing the oil outlet end and an oil cavity connecting the inlet end and the outlet end; the oil cavity comprises a first cavity and a second cavity which are distributed along the axial direction and are mutually separated, the first cavity is communicated with the inlet end, and the second cavity is communicated with the outlet end; the inlet end is in sliding sealing fit with the inner wall of the pump cylinder; an annular oil groove is formed in the area, corresponding to the first cavity, of the periphery of the plunger, two side walls of the oil groove gradually shrink towards the bottom of the oil groove, and a first through hole communicated with the first cavity is formed in the bottom of the oil groove; and a second through hole communicated with the second cavity is formed in the area, corresponding to the second cavity, of the periphery of the plunger. The elastic ring is arranged in the oil groove and used for opening or shielding the first through hole.)

1. The oil well pump is characterized by comprising a pump cylinder and a plunger assembly, wherein the pump cylinder is provided with an oil inlet end and an oil outlet end; the plunger assembly includes:

the plunger is arranged in the pump cylinder in a sliding mode, a gap is reserved between the plunger and the inner wall of the pump cylinder, and the plunger is provided with an inlet end facing the oil inlet end, an outlet end facing the oil outlet end and an oil cavity connecting the inlet end and the outlet end; the oil cavity comprises a first cavity and a second cavity which are distributed along the axial direction and are mutually separated, the first cavity is communicated with the inlet end, and the second cavity is communicated with the outlet end; the inlet end is in sliding sealing fit with the inner wall of the pump cylinder; an annular oil groove is formed in the area, corresponding to the first cavity, of the periphery of the plunger, two side walls of the oil groove gradually contract towards the bottom of the oil groove, and a first through hole communicated with the first cavity is formed in the bottom of the oil groove; a second through hole communicated with the second cavity is formed in the area, corresponding to the second cavity, of the periphery of the plunger;

and the elastic ring is arranged in the oil groove and used for opening or shielding the first through hole.

2. The oil well pump of claim 1, wherein the oil grooves and the elastic rings are provided in the same number, the oil grooves are axially spaced along the plunger, and the elastic rings are correspondingly provided in the oil grooves.

3. The defueling pump of claim 1, wherein the number of the first through holes of the same oil groove is multiple, and each of the first through holes is distributed along the circumferential direction of the plunger.

4. The oil well pump of claim 1, wherein the inlet end of the plunger has an annular groove formed in its outer periphery, and the bottom surface of the annular groove is a tapered surface that gradually tapers toward the oil outlet end; and a sealing ring which is in sealing fit with the pump cylinder is arranged in the annular groove.

5. The defueling pump of claim 4, wherein the inlet end of the plunger is peripherally provided with a plurality of protruding rings, the protruding rings are positioned on one side of the annular groove far away from the oil outlet end, and a sealing ring which is in sealing fit with the inner wall of the pump barrel is arranged between two adjacent protruding rings.

6. The pump of any of claims 1-5, further comprising a valve, the valve comprising:

the valve cover is provided with a first end and a second end which are communicated, a fixing part is arranged in the second end, the fixing part is provided with a guide hole and an oil passing hole which are communicated along the axial direction of the valve cover, and the valve cover is butted with the oil inlet end;

a valve seat having a bottom end portion and a top end portion therethrough, the top end portion being sealingly engaged within the first end, the bottom end portion being located outside the first end;

the blocking piece is a rotary body and comprises a bottom surface and a side surface surrounding the bottom surface, the side surface gradually shrinks towards the first end and movably abuts against the top end part of the valve seat, and the bottom surface is larger than the inner diameter of the top end part and faces towards the second end;

one end of the guide post is connected with the bottom surface, and the other end of the guide post can slidably penetrate through the guide hole;

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

the sealing element is sleeved outside the guide column and located between the pressing sleeve and the bottom surface, a flange which surrounds the bottom surface and abuts against the top end portion is arranged on the edge of the sealing element, and the sealing element is made of elastic materials.

7. The pump of claim 6, wherein the closure member is a segment structure, the bottom surface is a bottom surface of the segment structure, and the side surface is a spherical cap of the segment structure.

8. The pump of claim 6, wherein the surface of the flange abutting the top end has at least one annular ridge surrounding the bottom surface.

9. The pump of claim 8, wherein the surface of the annular rib abutting the top end is a curved surface.

10. The pump according to claim 6, wherein the bottom surface has a connecting rod, and the guide post has a connecting hole, and the connecting rod is inserted into the connecting hole and detachably connected to the guide post.

Technical Field

The utility model relates to an oil development technical field particularly, relates to an oil-well pump.

Background

In the field of oil extraction, an oil well pump is an indispensable device that can lift crude oil in a well to the surface. The pump cylinder is located underground, the plunger is arranged in the pump cylinder, the valve can be arranged at the bottom of the pump cylinder, pumping of petroleum is achieved through reciprocating movement of the plunger, meanwhile, unidirectional flow of the petroleum is achieved through the valve, and the petroleum entering the pump cylinder cannot flow back. However, in actual use, foreign particles such as sand and stone often appear in the valve, so that the sealing effect of the valve is reduced, and pumped oil may flow back, namely leak, and the oil extraction efficiency is affected.

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 which can prevent oil leakage and improve oil extraction efficiency.

According to one aspect of the present disclosure, an oil well pump is provided, comprising a pump barrel having an oil inlet end and an oil outlet end; the plunger assembly includes:

the plunger is arranged in the pump cylinder in a sliding mode, a gap is reserved between the plunger and the inner wall of the pump cylinder, and the plunger is provided with an inlet end facing the oil inlet end, an outlet end facing the oil outlet end and an oil cavity connecting the inlet end and the outlet end; the oil cavity comprises a first cavity and a second cavity which are distributed along the axial direction and are mutually separated, the first cavity is communicated with the inlet end, and the second cavity is communicated with the outlet end; the inlet end is in sliding sealing fit with the inner wall of the pump cylinder; an annular oil groove is formed in the area, corresponding to the first cavity, of the periphery of the plunger, two side walls of the oil groove gradually contract towards the bottom of the oil groove, and a first through hole communicated with the first cavity is formed in the bottom of the oil groove; a second through hole communicated with the second cavity is formed in the area, corresponding to the second cavity, of the periphery of the plunger;

and the elastic ring is arranged in the oil groove and used for opening or shielding the first through hole.

In an exemplary embodiment of the disclosure, the number of the oil grooves and the number of the elastic rings are the same, the oil grooves are distributed at intervals along the axial direction of the plunger, and the elastic rings are correspondingly arranged in the oil grooves.

In an exemplary embodiment of the disclosure, the number of the first through holes of the same oil groove is plural, and the first through holes are distributed along a circumferential direction of the plunger.

In an exemplary embodiment of the present disclosure, an annular groove is formed on an outer circumference of the inlet end of the plunger, and a bottom surface of the annular groove is a tapered surface gradually contracting toward the oil outlet end; and a sealing ring which is in sealing fit with the pump cylinder is arranged in the annular groove.

In an exemplary embodiment of the disclosure, a plurality of convex rings are arranged on the periphery of the inlet end of the plunger, the convex rings are located on one side of the annular groove far away from the oil outlet end, and a sealing ring in sealing fit with the inner wall of the pump barrel is arranged between every two adjacent convex rings.

In an exemplary embodiment of the present disclosure, the oil well pump further includes a valve, the valve including:

the valve cover is provided with a first end and a second end which are communicated, a fixing part is arranged in the second end, the fixing part is provided with a guide hole and an oil passing hole which are communicated along the axial direction of the valve cover, and the valve cover is butted with the oil inlet end;

a valve seat having a bottom end portion and a top end portion therethrough, the top end portion being sealingly engaged within the first end, the bottom end portion being located outside the first end;

the blocking piece is a rotary body and comprises a bottom surface and a side surface surrounding the bottom surface, the side surface gradually shrinks towards the first end and movably abuts against the top end part of the valve seat, and the bottom surface is larger than the inner diameter of the top end part and faces towards the second end;

one end of the guide post is connected with the bottom surface, and the other end of the guide post can slidably penetrate through the guide hole;

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

the sealing element is sleeved outside the guide column and located between the pressing sleeve and the bottom surface, a flange which surrounds the bottom surface and abuts against the top end portion is arranged on the edge of the sealing element, and the sealing element is made of elastic materials.

In an exemplary embodiment of the present disclosure, the blocking member is a segment structure, the bottom surface is a bottom surface of the segment structure, and the side surface is a spherical cap of the segment structure.

In an exemplary embodiment of the disclosure, a surface of the flange abutting the tip portion has at least one ring of annular rib surrounding the bottom surface.

In an exemplary embodiment of the present disclosure, a surface of the annular projected ridge abutting against the tip portion is a curved surface.

In an exemplary embodiment of the present disclosure, the bottom surface has a connecting rod, and the guide post is provided with a connecting hole, and the connecting rod is fitted through the connecting hole and detachably connected to the guide post.

When the plunger moves towards the oil outlet end, namely the oil pump is in an up stroke, under the action of negative pressure, oil can enter the pump cylinder from the oil inlet end and enter the first cavity of the plunger from the inlet end, and in the process, the oil between the pump cylinder and the plunger can tightly press the elastic ring on the side wall of the oil groove to shield the first through hole, so that the oil between the pump cylinder and the plunger cannot flow back to the first cavity; when the plunger moves towards the oil inlet end, namely the oil well pump is in the downstroke, the pressure in the pump cylinder is increased, the oil in the first cavity enables the elastic ring to expand outwards, the first through hole is opened, the oil enters the space between the pump cylinder and the plunger from the first cavity, enters the second cavity from the second through hole and is output from the oil outlet end through the outlet end of the plunger.

In conclusion, the oil groove, the first through hole and the elastic ring form a one-way valve structure, so that oil can be only output but not flow back; because the elastic ring has elasticity, even if there are impurities such as grit, it still can hug closely the inner wall of oil groove, realizes sealedly to prevent the oil backward flow, improve sealing performance, and then improve oil recovery efficiency.

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 view of an oil well pump 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 an enlarged view of a portion C in fig. 1.

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

Fig. 6 is a schematic view of a valve ball segment of an oil well pump according to an embodiment of the present disclosure.

Fig. 7 is a schematic view of a valve seal of an oil well pump according to an embodiment of the present disclosure.

Description of reference numerals:

1. a pump barrel; 2. a plunger assembly; 21. a plunger; 211. an oil chamber; 201. a blocking portion; 2111. a first chamber; 2112. a second chamber; 212. an oil sump; 213. a first through hole; 214. a second through hole; 22. an elastic ring; 3. a fixing pin; 41. an annular groove; 42. a seal ring; 43. a convex ring; 100. a valve cover; 101. a fixed part; 1011. an oil passing hole; 102. a first boss; 200. a valve seat; 2001. a first seat body; 2002. a second seat body; 2021. a second boss; 300. a blocking member; 301. a bottom surface; 302. a side surface; 3021. a screw hole; 400. a guide post; 500. pressing the sleeve; 600. a seal member; 601. flanging; 611. an annular rib; 700. and (6) pressing the cap.

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" are used merely as labels, and are not limiting as to the number of their objects.

The disclosed embodiment provides an oil well pump, as shown in fig. 1-4, the oil well pump comprises a pump cylinder 1 and a plunger assembly 2, wherein the pump cylinder 1 is provided with an oil inlet end and an oil outlet end; the plunger assembly 2 comprises a plunger 21 and an elastic ring 22, wherein:

plunger 21 slidable locate in pump barrel 1, and with the inner wall of pump barrel 1 has the clearance, plunger 21 has entrance point, exit end and oil chamber 211, and the entrance point sets up and opens towards the oil feed end, and the exit end sets up and opens towards the oil outlet end, and entrance point and exit end are connected to oil chamber 211.

The oil chamber 211 comprises a first chamber 2111 and a second chamber 2112, the first chamber 2111 and the second chamber 2112 are distributed along the axial direction and are separated from each other, the first chamber 2111 is communicated with the inlet end, and the second chamber 2112 is communicated with the outlet end; the inlet end is in sliding sealing fit with the inner wall of the pump cylinder 1; as shown in fig. 1 and 2, an annular oil groove 212 is provided in a region of the outer periphery of the plunger 21 corresponding to the first chamber 2111, both side walls of the oil groove 212 gradually contract toward the bottom of the oil groove 212, and the bottom of the oil groove 212 has a first through hole 213 communicating with the first chamber 2111; the area of the outer periphery of the plunger 21 corresponding to the second chamber 2112 is provided with a second through hole 214 communicating with the second chamber 2112.

The elastic ring 22 is disposed in the oil groove 212 to open or shield the first through hole 213.

The oil pump of the embodiment of the present disclosure can form a one-way valve structure by the oil groove 212, the first through hole 213 and the elastic ring 22, so that oil can be only output without backflow; because the elastic ring 22 has elasticity, even if impurities such as sand and stone exist, the elastic ring can still be tightly attached to the inner wall of the oil groove 212 to realize sealing, thereby preventing oil from flowing back, improving the sealing performance and further improving the oil extraction efficiency.

Specifically, when the plunger 21 moves towards the oil outlet end, that is, when the oil pump is in the up stroke, under the action of negative pressure, oil can enter the pump barrel 1 from the oil inlet end and enter the first cavity 2111 of the plunger 21 from the inlet end, during the process, the oil between the pump barrel 1 and the plunger 21 can press the elastic ring 22 against the side wall of the oil groove 212 to shield the first through hole 213, so that the oil between the pump barrel 1 and the plunger 21 cannot flow back to the first cavity 2111; when the plunger 21 moves towards the oil inlet end, that is, when the oil pump is in a down stroke, the pressure in the pump barrel 1 increases, the oil in the first cavity 2111 expands the elastic ring 22 outwards, so that the first through hole 213 is opened, and the oil enters the space between the pump barrel 1 and the plunger 21 from the first cavity 2111, enters the second cavity 2112 from the second through hole 214, and is output from the oil outlet end of the plunger 21.

The following describes each part of the oil pump according to the embodiment of the present disclosure in detail:

as shown in fig. 1, the pump barrel 1 is a tubular structure with two through ends, one end is an oil inlet end, and the other end is an oil outlet end, and when the pump barrel 1 is placed in the ground, the oil inlet end is located below the oil outlet end.

As shown in fig. 2, the plunger assembly 2 includes a plunger 21 and an elastic ring 22, wherein:

the plunger 21 is slidably provided in the pump cylinder 1 in the axial direction of the pump cylinder 1 with a gap from the inner wall of the pump cylinder 1. The plunger 21 has an inlet end, an outlet end, and an oil chamber 211, wherein the inlet end of the plunger 21 is located on the side of the outlet end close to the oil inlet end of the cylinder 1; the inlet end is open towards the oil inlet end and the outlet end is open towards the oil outlet end.

The oil chamber 211 is connected with an inlet end and an outlet end, a blocking part 201 is arranged in the oil chamber 211, the blocking part 201 can be in sealing fit with the inner wall of the plunger 21, and the blocking part 201 can be connected with the plunger 21 through a fixing pin or can be connected with the plunger 21 through threaded connection or other modes. Of course, it may be integrally formed with the plunger 21. The oil chamber 211 may be divided into a first chamber 2111 and a second chamber 2112 by the barrier 201, the first chamber 2111 and the second chamber 2112 being distributed axially, and the first chamber 2111 is located on the side of the barrier 201 near the inlet end, and the first chamber 2111 communicates with the inlet end, the second chamber 2112 is located on the side of the barrier 201 near the outlet end, and the second chamber 2112 communicates with the outlet end.

As shown in fig. 2, the outer periphery of the inlet end of the plunger 21 is in sliding sealing fit with the inner wall of the pump barrel 1, the outer periphery of the plunger 21 is provided with an annular oil groove 212 in a region corresponding to the first chamber 2111, namely, the oil groove 212 surrounds the outer periphery of the first chamber 2111, two side walls of the oil groove 212 gradually contract towards the bottom of the oil groove 212, and the bottom of the oil groove 212 is provided with a first through hole 213 communicated with the first chamber 2111; the area of the outer periphery of the plunger 21 corresponding to the second chamber 2112 is provided with a second through hole 214, and the second through hole 214 communicates with the second chamber 2112, i.e., the second through hole 214 communicates the space between the cylinder 1 and the plunger 21 with the second chamber 2112.

The oil entering the pump barrel 1 from the oil inlet end of the pump barrel 1 can only enter the first cavity 2111, and then enters the space between the pump barrel 1 and the plunger 21 from the first cavity 2111 through the oil groove 212, but cannot directly enter the space between the pump barrel 1 and the plunger 21; oil entering the space between the pump barrel 1 and the plunger 21 through the oil groove 212 may enter the second chamber 2112 through the second through hole 214 and then exit the outlet end of the plunger 21.

As shown in fig. 2, the elastic ring 22 may be made of rubber or other elastic material, and may be disposed in the oil groove 212 and abut against the sidewall of the oil groove 212, so as to shield the first through hole 213 and isolate the first cavity 2111 from the outside of the plunger 21; meanwhile, a gap is formed between the periphery of the elastic ring 22 and the inner wall of the pump barrel 1, and the elastic ring 22 expands and deforms outwards when being subjected to an outward acting force, so that at least a partial area of the elastic ring 22 is separated from the inner wall of the oil groove 212, and the first cavity 2111 is communicated with the outside of the plunger 21. Thereby, the first through hole 213 can be opened or shielded by the elastic ring 22.

In an embodiment, as shown in fig. 2, the oil grooves 212 and the elastic rings 22 are respectively provided in a plurality of numbers, the number of the oil grooves 212 is the same, the oil grooves 212 are distributed at intervals along the axial direction of the plunger 21 and surround the first cavity 2111, and the elastic rings 22 are respectively disposed in the oil grooves 212 in a one-to-one correspondence manner. In addition, the number of the first through holes 213 of the same oil groove 212 is plural, and the first through holes 213 of the oil groove 212 are distributed along the circumferential direction of the plunger 21.

As shown in fig. 1 and 3, the periphery of the inlet end of the plunger 21 is provided with an annular groove 41, the bottom surface of the annular groove 41 is a conical surface gradually contracting towards the oil outlet end, and a sealing ring 42 which is in sealing fit with the pump barrel 1 is arranged in the annular groove 41, so that one-way operation can be realized. Further, a plurality of convex rings 43 are arranged on the periphery of the inlet end of the plunger 21, the convex rings 43 can be axially arranged on one side of the annular groove 41 far away from the oil outlet end, and a sealing ring (not shown) which is in sealing fit with the inner wall of the pump barrel 1 is arranged between two adjacent convex rings 43, so that sliding sealing is realized.

As shown in fig. 1 and fig. 4 to 7, the oil well pump according to the embodiment of the present disclosure further includes a valve, which includes a valve cover 100, a valve seat 200, a blocking piece 300, a guide post 400, a pressing sleeve 500, and a sealing piece 600, wherein:

the valve cover 100 has a first end and a second end therethrough. The second end is provided with a fixing part 101, and the fixing part 101 is provided with a guide hole and an oil passing hole 1011 which penetrate along the axial direction of the valve cover 100. The second end of the valve cover 100 may be connected to the oil inlet end of the pump barrel 1 by a press cap 700.

The valve seat 200 has a bottom end portion and a top end portion extending therethrough, the top end portion being sealingly fitted within the second end, the bottom end portion being located outside the second end.

The plugging piece 300 is arranged in the valve cover 100, the plugging piece 300 is a rotary body and comprises a bottom surface 301 and a side surface 302, the side surface 302 gradually shrinks towards the first end of the valve cover 100, namely the cross section of the side surface 302 gradually shrinks towards the first section, the side surface 302 movably abuts against the top end part of the valve seat 200, and the bottom surface 301 is larger than the inner diameter of the top end part and faces towards the second end.

One end of the guide post 400 is connected to the bottom surface 301 of the blocking member 300, and the other end slidably passes through the guide hole.

The pressing sleeve 500 is slidably sleeved on the guide post 400 and is located on a side of the bottom surface 301 of the blocking piece 300 close to the second end of the valve cover 100.

The sealing member 600 is sleeved outside the guide post 400 and located between the pressing sleeve 500 and the bottom surface 301 of the plugging member 300, the edge of the sealing member 600 has a flange 601 surrounding the bottom surface 301 and abutting against the top end of the valve seat 200, and the sealing member 600 is made of elastic material.

In the valve structure of the embodiment of the present disclosure, since the block piece 300 is a solid of revolution, sealing can be achieved by abutting the side surface 302 of the block piece 300 against the top end portion of the valve seat 200; meanwhile, as the bottom surface 301 is provided with the elastic sealing element 600, under the action of oil pressure, the pressing sleeve 500 can be extruded to the valve seat 200, so that the flange 601 of the sealing element 600 is in sealing fit with the end surface of the top end part of the valve seat 200, two sealing is realized, the sealing effect is improved, even if a gap caused by impurity particles exists between the side surface 302 of the plugging element 300 and the valve seat 200, the sealing effect can be still ensured, the backflow leakage of petroleum is prevented, and the improvement of the oil extraction amount is facilitated. If the block piece 300 is separated from the valve seat 200 by the oil pressure, the flow of the oil is not affected. In addition, the guide post 400 can guide the plugging member 300 to move along the axial direction of the valve cover 100, so as to prevent the plugging member 300 from deflecting. The oil passing hole 1011 can be used for oil to pass through.

The following provides a detailed description of the various parts of the valve structure of the embodiments of the present disclosure:

as shown in fig. 4 and 5, the valve cover 100 may be a tubular structure with two ends penetrating, one end of the tubular structure being a first end and the other end being a second end. The cross section of the valve cover 100 may be circular, but may also be oval, rectangular, etc., and is not limited herein.

The fixing portion 101 is disposed in the second end, and the fixing portion 101 can be connected to the inner wall of the second end of the valve cover 100 in a sealing manner, for example, by screwing, or the like, or can be integrally formed with the valve cover 100, which is not limited herein. Meanwhile, the fixing portion 101 is provided with a guide hole and an oil passing hole 1011 penetrating in the axial direction of the valve cover 100. The guide hole may be located at the center of the fixing portion 101, the oil passing holes 1011 may be located at the periphery of the guide hole, and the number of the oil passing holes 1011 may be multiple, for example, three, four, five, etc., and each of the oil passing holes 1011 may be uniformly distributed around the guide hole. One end of the pressure cap 700 is sleeved outside the oil inlet end of the pump barrel 1, and the second end of the valve cover 100 is fitted in the end of the pressure cap 700 far away from the pump barrel 1.

As shown in fig. 5, the valve seat 200 can have a bottom end and a top end, with the bottom end and the top end being through a passage. The top end of the valve seat 200 may extend into the second end of the valve cover 100 and sealingly engage the inner wall of the valve cover 100, e.g., the top end may be threaded into engagement with the inner wall of the valve cover 100. Meanwhile, in order to limit the position of the valve cover 100 and the valve seat 200, the inner wall of the valve cover 100 is provided with a first boss 102, the outer peripheral surface of the valve seat 200 is provided with a second boss 2021 in the region outside the valve cover 100, the top end of the valve seat 200 abuts against the first boss 102, and the first end of the valve cover 100 abuts against the second boss 2021.

The valve seat 200 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. 5, the valve seat 200 may include a first seat body 2001 and a second seat body 2002, wherein:

both the first seat body 2001 and the second seat body 2002 may be cylindrical structures with two ends penetrating, but the inner diameters of the two bodies may be different. The first seat body 2001 is located inside the valve cover 100, one end of the second seat body 2002 abuts against the first seat body 2001, and the other end of the second seat body 2002 extends from the first end of the valve cover 100 to the outside of the valve cover 100. The end of the first seat body 2001 far away from the second seat body 2002 belongs to the top end of the valve seat 200, and the end of the second seat body 2002 far away from the first seat body 2001 belongs to the bottom end of the valve seat 200.

As shown in fig. 5, the plugging member 300 is a solid of revolution and includes a bottom surface 301 and a side surface 302, the bottom surface 301 may be a plane, and the side surface 302 may surround the bottom surface 301 for a circle. For example, the blocking element 300 may be a segment structure, the bottom surface of which is the bottom surface 301 of the blocking element 300, and the spherical cap of which is the side surface 302; alternatively, the plug 300 may have other shapes, such as a conical structure, where the bottom surface of the conical structure is the bottom surface 301 of the plug 300, and the tapered surface of the cylindrical structure is the side surface 302.

The blocking piece 300 is movably arranged in the valve cover 100, the side surface 302 is movably abutted with the top end part of the valve seat 200, and the bottom surface 301 is larger than the inner diameter of the top end part of the valve seat 200 and faces the second end of the valve cover 100 to prevent the blocking piece 300 from sliding into the valve seat 200. When the side surface 302 abuts against the top end of the valve seat 200, the top end can be closed to block the flow of oil, and when the side surface 302 is separated from the top end, the top end can be opened to allow the flow of oil.

The side 302 of the block piece 300 may be provided with a threaded bore 3021, for example, the threaded bore 3021 may be located at an apex position when the side 302 is spherical crown shaped. Can be used for being connected with the weight part through threads to increase the pressure of the plugging part 300 on the valve seat 200.

As shown in fig. 5, one end of the guide post 400 may be connected to the bottom surface 301 of the blocking member 300, and the other end may slidably pass through the guide hole of the fixing portion 101, so that the guide post 400 may reciprocate along the guide hole to guide the movement of the blocking member 300, thereby guiding the axial movement of the blocking member 300 along the valve cover 100, and preventing the blocking member 300 from deflecting during the movement and failing to make sealing contact with the valve seat 200.

As shown in fig. 5, the bottom surface 301 of the blocking piece 300 may have a connecting rod, and one end of the guide post 400 near the blocking piece 300 is provided with an axially extending connecting hole, which may be a blind hole, into which the connecting rod extends and is threadedly connected with the connecting hole, thereby detachably connecting the guide post 400 and the blocking piece 300. Of course, the guide post 400 may be directly inserted into the block piece 300 and screwed, and the guide post 400 may be integrally formed with the block piece 300, and the connection manner of the guide post 400 and the block piece 300 is not particularly limited.

The pressing sleeve 500 is slidably sleeved on the guide post 400 and located on one side of the bottom surface 301 of the blocking piece 300 close to the second end of the valve cover 100, and the pressing sleeve 500 can press the sealing piece 600 against the valve seat 200 under the action of oil pressure. The pressing sleeve 500 may be made of metal and have a density weight greater than that of the sealing member 600 so as to press the sealing member 600.

As shown in fig. 5 and 7, the sealing member 600 is made of an elastic material, such as rubber. The sealing member 600 is sleeved outside the guide post 400, is located between the pressing sleeve 500 and the bottom surface 301 of the blocking member 300, and can be pressed by the pressing sleeve 500. The edge of the sealing member 600 has a flange 601 extending toward the valve seat 200, the flange 601 may be an annular structure and surrounds the bottom surface 301, and the flange 601 abuts against the top end portion of the valve seat 200, so as to achieve a sealing fit, and further perform sealing on the basis of sealing the plugging member 300 and the valve seat 200.

As shown in fig. 7, in order to improve the sealing effect and facilitate the contact between the flange 601 and the end face of the top end of the valve seat 200, the surface of the flange 601 near the top end of the valve seat 200 may have an annular rib 611, and the annular rib 611 surrounds the bottom surface 301 of the blocking piece 300. The cross section of the annular rib 611 may be an arc, that is, the surface of the annular rib 611 abutting against the top end portion is an arc, or the cross section of the annular rib 611 may be a rectangle or other figures. In order to improve the sealing effect, the annular rib 611 may be provided in a plurality and concentrically arranged around the bottom surface 301, so as to form a plurality of seals, further preventing oil leakage.

The annular rib 611 is closely fitted to the end surface of the top end portion of the valve seat 200 when the seal 600 is pressed toward the valve seat 200, and the annular rib 611 prevents oil leakage even when the side surface 302 is in clearance with the valve seat 200. When the blocking member 300 is pressed toward the second end of the valve cover 100, the sealing member 600 is driven to move toward the second end synchronously, and the side surface 302 and the annular rib 611 are separated from the valve seat 200, so that the petroleum can enter.

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.