Oil well pump and valve structure

Abstract

The present invention provides a pump and a valve structure, which relate to the technical field of oil extraction. The valve structure includes a valve cover, a valve seat, a first sealing ring, a valve ball and a guide column. The valve cover has a first open end and a second open end that are connected, a boss is provided in the first open end, a fixing part is provided in the second open end, and a guide hole is provided in the fixing part that is connected along the axial direction of the valve cover; the two ends of the valve seat are connected, one end extends into the first open end and abuts against the boss, the outer peripheral surface of the valve seat has a first annular groove, and the first annular groove is recessed radially inward from the outer peripheral surface of the valve seat; the first sealing ring is clamped in the first annular groove and seals with the inner peripheral surface of the valve cover; the valve ball is arranged in the valve cover, including a bottom surface and a side surface, the side surface is movably abutted with the top end of the valve seat, and the bottom surface faces the second open end; the guide column has a first end and a second end, the first end slides through the guide hole, and the second end passes through the valve ball and extends to the side of the valve seat away from the boss.

Description

Technical Field

[0001] The present invention relates to the technical field of oil extraction, and in particular to an oil well pump and a valve structure. Background Art

[0002] The oil pump is an indispensable equipment in the process of oil extraction, which can lift the crude oil in the well to the ground. In the existing oil pump, a valve is generally used to realize the one-way flow of oil. The valve is usually opened and closed by the contact or separation of the valve ball and the valve seat in the valve cover. However, there is an assembly gap between the valve cover and the valve seat. During the process of lifting crude oil, oil leakage occurs on the periphery of the valve seat under the action of oil pressure, affecting the oil extraction efficiency.

[0003] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present disclosure, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies of the above-mentioned prior art and to provide an oil pump and a valve structure to prevent oil leakage and improve oil recovery efficiency.

[0005] According to one aspect of the present disclosure, a valve structure is provided, comprising:

[0006] The valve cover has a first open end and a second open end that are connected, wherein the first open end has a boss that surrounds the inner wall of the first open end, and the second open end has a fixing portion that is provided with a guide hole and an oil hole that are connected along the axial direction of the valve cover;

[0007] A valve seat, wherein both ends of the valve seat are connected, and one end extends into the first open end of the valve cover and abuts against the boss, and the outer peripheral surface of the valve seat has a first annular groove, and the first annular groove is recessed radially inward from the outer peripheral surface of the valve seat;

[0008] A first sealing ring is clamped in the first ring groove and is in sealing cooperation with the inner peripheral surface of the valve cover;

[0009] A valve ball is arranged in the valve cover, comprising a bottom surface and a side surface surrounding the bottom surface, the side surface is movably abutted against the top end of the valve seat, and the bottom surface faces the second open end;

[0010] The guide column has a first end and a second end, wherein the first end can slide through the guide hole, and the second end passes through the valve ball and extends toward a side of the valve seat away from the boss.

[0011] In an exemplary embodiment of the present disclosure, there are a plurality of first annular grooves, and there are a plurality of first sealing rings, and each of the first sealing rings is disposed in each of the first annular grooves in a one-to-one correspondence.

[0012] In an exemplary embodiment of the present disclosure, the valve structure further includes:

[0013] The counterweight block is fixedly connected to the guide column and is located on a side of the valve ball away from the guide hole.

[0014] In an exemplary embodiment of the present disclosure, the counterweight block is sleeved on the outside of the second end of the guide column, the outer surface of the second end of the guide column has an external thread, and the inner surface of the counterweight block is provided with an internal thread, and the internal thread and the external thread cooperate with each other so that the counterweight block is threadedly connected to the second end of the guide column.

[0015] In an exemplary embodiment of the present disclosure, the valve structure further includes:

[0016] A connecting rod has one end connected to the second end of the guide column and is hinged to the second end of the guide column; and the counterweight is fixed to the end of the connecting rod away from the second end.

[0017] In an exemplary embodiment of the present disclosure, the counterweight block and the connecting rod are in an integrated structure.

[0018] In an exemplary embodiment of the present disclosure, the outer circumferential surface of the guide post is provided with a second annular groove, and the second annular groove is recessed radially inward from the outer circumferential surface of the guide post;

[0019] The valve structure also includes a second sealing ring, which is embedded in the second ring groove and seals with the valve ball.

[0020] In an exemplary embodiment of the present disclosure, the valve structure further includes:

[0021] A pressing sleeve, which is slidably sleeved on the guide column and is located on a side of the bottom surface of the valve ball close to the first end;

[0022] The sealing member is sleeved outside the guide column and is located between the pressing sleeve and the bottom surface of the valve ball. The edge of the sealing member has a flange surrounding the bottom surface and abutting against the end of the valve cover.

[0023] In an exemplary embodiment of the present disclosure, the first sealing ring and the second sealing ring are both made of elastic material.

[0024] According to one aspect of the present disclosure, there is provided a well pump, comprising:

[0025] A pump barrel having an oil inlet end and an oil outlet end;

[0026] A piston slidably disposed in the pump barrel;

[0027] The valve structure described in any one of the above items is arranged in the pump barrel, and the second open end of the valve cover of the valve structure is fixedly connected to the oil inlet end of the pump barrel along the axial direction.

[0028] The oil pump and valve structure disclosed in the present invention, when pumping oil, the valve ball moves up under the action of vacuum force, and the valve ball is separated from the valve seat, providing a channel for the circulation of oil, so that the oil enters the valve cover; under the action of oil pressure, the valve ball moves down, and the side of the valve ball can be abutted with the top of the valve seat to achieve the sealing of the valve ball and the valve seat, and prevent the oil from flowing back along the circulation channel. In this process, the first sealing ring is clamped in the first annular groove and cooperates with the inner peripheral surface of the valve cover to seal the assembly gap between the inner peripheral surface of the valve cover and the outer peripheral surface of the valve seat, and the oil can be prevented from flowing back and leaking from the assembly gap between the valve seat and the valve cover, thereby improving the oil production; in addition, the guide column can guide the valve ball to move along the axial direction of the valve cover, avoid the deflection of the valve ball, reduce the drift time of the valve ball rising and falling, and improve the oil production efficiency.

[0029] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The accompanying drawings herein are incorporated into the specification and constitute a part of the specification, illustrate embodiments consistent with the present disclosure, and together with the specification are used to explain the principles of the present disclosure. Obviously, the accompanying drawings described below are only some embodiments of the present disclosure, and for ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without creative work.

[0031] Figure 1 It is a schematic diagram of the valve structure of an embodiment of the present disclosure.

[0032] Figure 2 for Figure 1 Enlarged view of part A in the middle.

[0033] Figure 3 for Figure 1 Enlarged view of part B in the middle.

[0034] Figure 4 Schematic diagram of a connecting rod according to an embodiment of the present disclosure.

[0035] Figure 5 It is a schematic diagram of a well pump according to an embodiment of the present disclosure.

[0036] Description of reference numerals:

[0037] 1. Valve cover; 11. Boss; 12. Oil hole; 2. Valve seat; 21. First ring groove; 22. First seat body; 23. Second seat body; 231. First connecting part; 232. Second connecting part; 3. First sealing ring; 4. Valve ball; 41. Side surface; 42. Bottom surface; 5. Guide column; 6. Counterweight; 61. Connecting rod; 7. Second sealing ring; 8. Press sleeve; 9. Seal; 100. Valve structure; 200. Pump barrel. DETAILED DESCRIPTION

[0038] Example embodiments will now be described more fully with reference to the accompanying drawings. However, the example embodiments can be implemented in a variety of forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that the present disclosure will be comprehensive and complete and fully convey the concepts of the example embodiments to those skilled in the art. The same reference numerals in the figures represent the same or similar structures, and thus their detailed description will be omitted. In addition, the drawings are only schematic illustrations of the present disclosure and are not necessarily drawn to scale.

[0039] Although relative terms such as "upper" and "lower" are used in this specification to describe the relative relationship of one component of the illustration to another component, these terms are used in this specification only for convenience, such as according to the orientation of the examples described in the drawings. It is understood that if the device of the illustration is turned upside down, the component described as "upper" will become the component "lower". When a structure is "on" other structures, it may mean that the structure is formed integrally on 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 through another structure.

[0040] The terms "a", "an", "the", "said" and "at least one" are used to indicate the presence of one or more elements / components / etc.; the terms "including" and "having" are used to express an open-ended inclusive meaning and mean that additional elements / components / etc. may exist in addition to the listed elements / components / etc.; the terms "first", "second" and "third" etc. are used merely as labels and are not intended to limit the quantity of their objects.

[0041] The disclosed embodiment provides a valve structure that can be used for an oil well pump. The valve structure can be used as a fixed valve or a floating valve. Figure 1 As shown, 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 column 5, wherein:

[0042] The valve cover 1 may have a first open end and a second open end that are connected, the first open end may have a boss 11 that surrounds the inner wall of the first open end, the second open end may have a fixing portion, and the fixing portion may have a guide hole that is connected along the axial direction of the valve cover 1;

[0043] The two ends of the valve seat 2 are connected, and one end can extend into the first open end of the valve cover 1 and abut against the boss 11. The outer peripheral surface of the valve seat 2 can have a first annular groove 21, and the first annular groove 21 can be recessed radially inward from the outer peripheral surface of the valve seat 2;

[0044] The first sealing ring 3 can be clamped in the first annular groove 21 and can be sealed with the inner peripheral surface of the valve cover 1;

[0045] The valve ball 4 can be arranged in the valve cover 1, including a bottom surface and a side surface surrounding the bottom surface, the side surface can be movably abutted against the top end of the valve seat 2, and the bottom surface can face the second open end;

[0046] The guide column 5 may have a first end and a second end. The first end may slide through the guide hole, and the second end may pass through the valve ball 4 and extend to a side of the valve seat 2 away from the boss 11 .

[0047] The oil pump and valve structure 100 disclosed in the present invention, when pumping oil, the valve ball 4 moves up under the action of vacuum force, and the valve ball 4 is separated from the valve seat 2, providing a channel for the circulation of oil, so that the oil enters the valve cover 1; the valve ball 4 moves down under the action of oil pressure, and the side of the valve ball 4 abuts against the top of the valve seat 2 to achieve the sealing of the valve ball 4 and the valve seat 2, and prevent the oil from flowing back along the circulation channel. In this process, the first sealing ring 3 is clamped in the first annular groove and cooperates with the inner peripheral surface of the valve cover 1 to seal the assembly gap between the inner peripheral surface of the valve cover 1 and the outer peripheral surface of the valve seat 2, and the oil can be prevented from flowing back and leaking from the assembly gap between the valve seat 2 and the valve cover 1, thereby improving the oil production; in addition, the guide column 5 can guide the valve ball 4 to move along the axial direction of the valve cover 1, avoid the deflection of the valve ball 4, reduce the drift time of the valve ball 4 rising and falling, and improve the oil production efficiency.

[0048] The following is a detailed description of each part of the valve structure 100 according to the embodiment of the present disclosure:

[0049] like Figure 1 As shown, the valve cover 1 can be a cylindrical structure with two ends connected, one end of which is a first open end and the other end is a second open end. The cross section of the inner circumference of the valve cover 1 can be circular, elliptical, rectangular or irregular, etc., which is not particularly limited here. Preferably, the cross section of the inner circumference of the valve cover 1 is circular.

[0050] The inner wall of the first open end may have a boss 11, which may be annular and coaxially arranged with the inner circumference of the first open end. The boss 11 may be integrally formed with the first open end of the valve cover 1, or may be welded to the first open end or fixedly connected by bolts. Of course, it may also be fixedly connected by other means, which are not particularly limited here. The boss 11 may be a truncated cone, a prism or a conical cone, of course, it may also be other shapes, which are not listed here one by one.

[0051] A fixing part is provided in the second open end, and the fixing part can be integrally formed with the second open end of the valve cover 1. At the same time, the fixing part is provided with a guide hole and an oil hole 12 which penetrate along the axial direction of the valve cover 1. The guide hole can be located at the center of the fixing part, and the oil hole 12 can be located at the periphery of the guide hole. The number of the oil holes 12 can be multiple, for example, it can be 2, 3, 4 or 5, of course, it can also be other numbers, which are not specifically limited here. It should be noted that the oil holes 12 can be evenly distributed around the guide hole.

[0052] like Figure 1 As shown, the valve seat 2 may have a through bottom end and a top end, wherein the top end may extend into the first open end of the valve cover 1 and may abut against the side of the boss 11 away from the second open end. The valve seat 2 may be a cylindrical structure, and its cross section may be circular or elliptical. Of course, it may also be in other shapes, which are not specifically limited here. It should be noted that in order to reduce the assembly gap between the valve cover 1 and the valve seat 2, the shape of the cross section of the outer peripheral surface of the valve seat 2 may be the same as the shape of the cross section of the inner peripheral surface of the valve cover 1. For example, the cross section of the outer peripheral surface of the valve seat 2 is circular, and the cross section of the inner peripheral surface of the valve cover 1 is also circular, and the diameter of the inner peripheral surface of the valve cover 1 may be slightly larger than the diameter of the outer peripheral surface of the top end of the valve seat 2, so that the top end of the valve seat 2 can penetrate into the first open end of the valve cover 1 and be connected to the inner peripheral surface of the valve cover 1 by threads.

[0053] In one embodiment, the valve seat 2 can be formed by connecting a plurality of axially distributed seat bodies, and each seat body is connected. Figure 1 As shown, the valve seat 2 may include a first seat body 22 and a second seat body 23, wherein:

[0054] The first seat body 22 and the second seat body 23 can both be cylindrical structures with two ends through, but the inner diameters of the two can be different. The first seat body 22 can extend into the valve cover 1, and can abut on the side of the second open end of the boss 11 away from the valve cover 1. One end of the second seat body 23 abuts against the first seat body 22 so as to limit the valve cover 2, and the other end extends to the side of the second open end of the first seat body 22 away from the valve cover 1 to the outside of the valve cover 1. The second seat body 23 may include a first connecting portion 231 and a second connecting portion 232 that are butted against each other, and can abut on the first seat body 22 through the first connecting portion 231, and the inner diameter of the first connecting portion 231 may be smaller than the inner diameter of the second connecting portion 232. The end of the first seat body 22 away from the second seat body 23 belongs to the top end of the valve cover 2, and the second connecting portion 232 of the second seat body 23 belongs to the bottom end of the valve cover 2.

[0055] The outer diameter of the valve seat 2 can be sealed with the inner wall of the valve cover 1, such as Figure 2 As shown, the outer peripheral surface of the valve seat 2 may have a first annular groove 21, the first annular groove 21 may be coaxially arranged with the valve seat 2, and may be located on the outer peripheral surface of the valve seat 2, and the first annular groove 21 may be radially recessed inward from the outer peripheral surface of the valve seat 2. The first sealing ring 3 may be clamped in the first annular groove 21, and may be sealed with the inner peripheral surface of the valve cover 1. The first sealing ring 3 may be made of an elastic material, for example, it may be rubber, etc., which is not particularly limited here. The first sealing ring 3 may protrude from the opening of the first annular groove 21, and the portion thereof protruding from the opening may abut against the inner peripheral surface of the valve cover 1, so as to seal the assembly gap between the valve cover 1 and the valve seat 2, thereby preventing oil from leaking from the assembly gap between the valve cover 1 and the valve seat 2, and improving oil production.

[0056] In order to further improve the sealing effect, the assembly gap between the valve cover 1 and the valve seat 2 can be sealed in multiple ways. For example, a plurality of first annular grooves 21 can be provided on the outer periphery of the valve seat 2. There can also be a plurality of first sealing rings 3, and the number thereof can be the same as the number of first annular grooves 21, and each first sealing ring 3 can be correspondingly arranged in each first annular groove 21. For example, the number of first annular grooves 21 and first sealing rings 3 can be 1, 2, 3, 4 or 5, and of course, other numbers can also be provided, which will not be listed here.

[0057] like Figure 1-Figure 3 As shown, the valve ball 4 is arranged in the valve cover 1, which can be a rotating body and includes a bottom surface 42 and a side surface 41. The bottom surface 42 can be a plane, and the side surface 41 can surround the bottom surface 42. For example, the valve ball 4 can be a spherical segment structure, the bottom surface 42 of the spherical segment structure is the bottom surface 42 of the valve ball, and the spherical cap of the spherical segment structure is the side surface 41; of course, the valve ball 4 can also be other shapes, for example, it can be a conical structure, the bottom surface 42 of the conical structure is the bottom surface 42 of the valve ball, and the conical surface of the cylindrical structure is the side surface 41 of the valve ball.

[0058] The valve ball 4 is movably disposed in the valve cover 1, and can move up and down along the axial direction of the valve cover 1 according to the flow state of the oil. The side surface 41 of the valve ball can movably abut against the top end of the valve seat 2, and the bottom surface 42 is larger than the inner diameter of the top end 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 prevent 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.

[0059] like Figure 1 As shown, the guide column 5 may be columnar and may have a first end and a second end. The first end may be slidably passed through the guide hole of the fixing portion, so that the guide column 5 may reciprocate along the guide hole, thereby guiding 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 being deflected during the movement and failing to seal and abut with the valve seat 2. The second end may penetrate the valve ball 4 and extend to the side of the valve seat 2 away from the boss 11.

[0060] The guide post 5 can be sealed with the valve ball 4. For example, the outer peripheral surface of the guide post 5 can be provided with a second annular groove, which can be coaxially arranged with the guide post 5 and can be located on the contact surface between the guide post 5 and the valve ball 4. The second annular groove can be recessed radially inward from the outer peripheral surface of the guide post 5. Figure 3 As shown, the second sealing ring 7 can be embedded in the second annular groove and can be sealed with the valve ball 4. The second sealing ring 7 can be made of an elastic material, for example, it can be rubber, etc., which is not particularly limited here. The surface of the second sealing ring 7 away from the bottom of the second annular groove can contact the valve ball 4, so as to seal the contact surface between the guide column 5 and the valve ball 4, prevent oil from leaking from the contact surface between the guide column 5 and the valve ball 4, and further increase the oil production. It should be noted that in order to ensure that there is no gap between the guide column 5 and the valve ball 4, the guide column 5 can also be an integrated structure with the valve ball 4.

[0061] There can be multiple second annular grooves, and the multiple second annular grooves can be arranged side by side along the axial direction of the guide column 5. There can also be multiple second sealing rings 7, and the number of the second sealing rings 7 can be the same as the number of the second annular grooves, and each second sealing ring 7 can be embedded in each second annular groove in a one-to-one correspondence. For example, the number of the second annular grooves and the second sealing rings 7 can be 1, 2, 3, 4 or 5, and of course, it can also be other numbers, which are not listed here one by one.

[0062] The valve structure 100 of the present disclosure may also include a counterweight block 6, such as Figure 1 and Figure 4As shown, the counterweight block 6 can be fixedly connected to the guide column 5 and can be located on the side of the valve ball 4 away from the guide hole. The counterweight block 6 can be made of a metal material with a high density, so as to increase the counterweight of the valve ball 4, speed up the downward movement of the valve ball 4, save time, and improve oil production efficiency. The counterweight block 6 can be a block-shaped solid structure, for example, it can be a column, a sphere or an irregular shape, which is not particularly limited here.

[0063] In one embodiment, the counterweight 6 can be connected to the guide column 5 by threads. For example, the inner surface of the counterweight 6 can be provided with internal threads, and the outer surface of the second end of the guide column 5 can be provided with external threads. The counterweight 6 can be sleeved outside the second end of the guide column 5 so that the internal threads and the external threads cooperate with each other, thereby connecting the counterweight 6 to the second end of the guide column 5 by threads. For example, the counterweight 6 can be a nut.

[0064] In another embodiment, Figure 4 As shown, the valve structure 100 may also include a connecting rod 61, one end of which may be connected to the second end of the guide column 5. For example, the connecting rod 61 may be hinged to the second end of the guide column 5 to prevent the counterweight 6 from loosening or breaking. The counterweight 6 may be fixed to the end of the connecting rod 61 away from the second end. For example, the connecting rod 61 may be inserted into the counterweight 6, and the counterweight 6 may be welded to the side of the connecting rod 61 away from the second end. The counterweight 6 may also be fixed to the connecting rod 61 in other ways, which are not listed here. In order to reduce the contact area between the counterweight 6 and the outside world and reduce the resistance when rising or falling, the counterweight 6 may be a sphere, and it may be integrally formed with the connecting rod 61 to prevent the counterweight 6 from falling off the connecting rod 61.

[0065] The valve structure 100 of the present disclosure may further include a compression sleeve 8, which may be slidably sleeved on the guide column 5 and may be located on the side of the bottom surface 42 of the valve ball close to the first end of the guide column 5. During the oil discharge process, the compression sleeve 8 may press the seal 9 toward the valve seat 2 under the action of the oil pressure to achieve sealing. The compression sleeve 8 may be made of metal, and its density and weight are greater than the weight of the seal 9, so as to compress the seal 9.

[0066] like Figure 1 and Figure 4 As shown, the seal 9 is sleeved outside the guide column 5 and is 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 the seal 9 has a flange extending toward the valve seat 2, and the flange can be an annular structure and surround the outside of the bottom surface 42, and the flange abuts against the top end of the valve seat 2, so as to achieve a sealing fit, and further seal on the basis of the sealing between the valve ball 4 and the valve seat 2, thereby improving the sealing effect. The seal 9 is made of elastic material, for example, it can be rubber.

[0067] In order to improve the sealing effect and facilitate the flange to contact the end face of the top end of the valve seat 2, the surface of the flange close to the top end of the valve seat 2 may have an annular ridge, and the annular ridge surrounds the outside of the bottom surface 42 of the valve ball. The cross section of the annular ridge may be an arc, that is, the surface where the annular ridge abuts against the top end is an arc surface, or the cross section of the annular ridge may also be a rectangle or other shapes. In order to improve the sealing effect, the number of annular ridges may be multiple, and they are concentrically arranged around the bottom surface 42, so as to form a multi-pass seal to further prevent oil leakage.

[0068] When the seal 9 is subjected to pressure toward the valve seat 2, the annular ridge can be closely matched with the end surface of the top end of the valve seat 2. At this time, even if there is a gap between the side 41 and the valve seat 2, the annular ridge can prevent oil leakage. When the valve ball 4 is subjected to pressure toward the second open end of the valve cover 1, the seal 9 can be driven to move synchronously toward the second open end, and the side 41 and the annular ridge are separated from the valve seat 2 to allow oil to enter.

[0069] The present disclosure also provides a pump, such as Figure 5 As shown, the oil pump includes a pump barrel 200, a piston and a valve structure 100, wherein:

[0070] The pump barrel 200 may include an oil inlet end and an oil outlet end, and the piston may be slidably disposed in the pump barrel 200. The valve structure 100 may be disposed in the pump barrel 200. When it is a fixed valve, the second open end of the valve cover of the valve structure 100 may be fixedly docked with the oil inlet end of the pump barrel 200 along the axial direction; when it is a floating valve, it may be disposed between the oil inlet end and the oil outlet end of the pump barrel 200. The structural details and beneficial effects of the valve structure 100 may refer to any of the above embodiments, and will not be repeated here.

[0071] A plurality of valve structures may be provided in the oil well pump, and the plurality of valve structures may be arranged in sequence from bottom to top along the axial direction of the pump barrel 200. For example, there may be three valves, namely the first valve, the second valve and the third valve. At least one of the first valve and the second valve is a valve structure 100 of any of the above-mentioned embodiments. If the first valve is the valve structure 100, the second open end of the valve cover 1 of the first valve is fixedly docked with the oil inlet end of the pump barrel 200 along the axial direction, and the second valve is arranged in the pump barrel 200; if the second valve is the valve structure 100, the second open end of the valve cover of the second valve is fixedly docked 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 docked with the end of the piston away from the oil inlet end.

[0072] It should be noted that the first valve, the second valve and the third valve may all be the valve structure 100 of the above-mentioned embodiment, but the first valve, the second valve and the third valve may be the valve structure 100 of different embodiments and are not limited to being completely the same.

[0073] The working process of the oil well pump in the embodiment of the present disclosure is described below:

[0074] 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 pumping oil, the piston moves upward, the pressure in the pump barrel 200 decreases, and a negative pressure is formed, so that the valve ball 4 of the first valve is separated from the valve seat 2, thereby opening the oil inlet end and providing a channel for the circulation of oil; at the same time, the valve balls 4 of the second valve and the third valve are in contact with their respective corresponding valve seats 2, so that the second valve and the third valve are closed; at this time, oil can enter the pump barrel 200 from the oil inlet end, and the oil between the second valve and the third valve is lifted. When the piston moves downward, the pressure in the pump barrel 200 increases, and the valve ball 4 of the first valve moves downward under the action of the oil pressure, and the side surface 41 of the valve ball abuts against the top of the valve seat 2, so as to achieve the sealing of the valve ball 4 and the valve seat 2, and prevent the oil from flowing back along the circulation channel. At the same time, 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 discharged from the oil outlet. In this process, the first sealing ring 3 can seal the assembly gap between the inner peripheral surface of the valve cover 1 and the outer peripheral surface of the valve seat 2, preventing oil from flowing back and leaking from the assembly gap between the valve seat 2 and the valve cover 1, thereby increasing oil production.

[0075] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the invention disclosed herein. This application is intended to cover any modification, use or adaptation of the present disclosure, which follows the general principles of the present disclosure and includes common knowledge or customary techniques in the art that are not disclosed in the present disclosure. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present disclosure are indicated by the appended claims.

Claims

1. A valve structure, characterized in that: include: The valve cover has a first open end and a second open end that are connected, wherein the first open end has a boss that surrounds the inner wall of the first open end, and the second open end has a fixing portion that is provided with a guide hole and an oil hole that are connected along the axial direction of the valve cover; A valve seat, wherein both ends of the valve seat are connected, and one end extends into the first open end of the valve cover and abuts against the boss, and the outer peripheral surface of the valve seat has a first annular groove, and the first annular groove is recessed radially inward from the outer peripheral surface of the valve seat; A first sealing ring is clamped in the first ring groove and is in sealing cooperation with the inner peripheral surface of the valve cover; A valve ball is arranged in the valve cover, comprising a bottom surface and a side surface surrounding the bottom surface, the side surface is movably abutted against the top end of the valve seat, and the bottom surface faces the second open end; A guide column having a first end and a second end, wherein the first end is slidably passed through the guide hole, and the second end passes through the valve ball and extends toward a side of the valve seat away from the boss; The outer circumferential surface of the guide column is provided with a second annular groove, and the second annular groove is recessed radially inward from the outer circumferential surface of the guide column; The valve structure also includes a second sealing ring, which is embedded in the second ring groove and seals with the valve ball; A counterweight block is fixedly connected to the guide column and is located on a side of the valve ball away from the guide hole; the counterweight block is sleeved outside the second end of the guide column, the outer surface of the second end of the guide column has an external thread, and the inner surface of the counterweight block is provided with an internal thread, and the internal thread and the external thread cooperate with each other so that the counterweight block is connected to the second end of the guide column through threads; the counterweight block is a block-shaped solid structure; A connecting rod, one end of which is connected to the second end of the guide column and is hinged to the second end of the guide column; the counterweight is fixed to the end of the connecting rod away from the second end; The counterweight block and the connecting rod are in an integrated structure.

2. The valve structure according to claim 1, characterized in that: There are a plurality of the first annular grooves, a plurality of the first sealing rings, and the first sealing rings are disposed in the first annular grooves in a one-to-one correspondence.

3. The valve structure according to claim 1, characterized in that: The valve structure also includes: A pressing sleeve, which is slidably sleeved on the guide column and is located on a side of the bottom surface of the valve ball close to the first end; The sealing member is sleeved outside the guide column and is located between the pressing sleeve and the bottom surface of the valve ball. The edge of the sealing member has a flange surrounding the bottom surface and abutting against the end of the valve cover.

4. The valve structure according to claim 1, characterized in that: The first sealing ring and the second sealing ring are both made of elastic material.

5. A well pump, characterized in that: include: A pump barrel having an oil inlet end and an oil outlet end; A piston slidably disposed in the pump barrel; The valve structure described in any one of claims 1 to 4 is arranged in the pump barrel, and the second open end of the valve cover of the valve structure is fixedly connected to the oil inlet end of the pump barrel along the axial direction.

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