Anti-breaking cover of oil well pump

Abstract

The utility model relates to the technical field of oil well pumps of oil industry production equipment, in particular to an anti-breaking cover of an oil well pump. Comprising a plunger head and a valve body, the plunger head is connected with the valve body, a protection mechanism is arranged between the valve body and the plunger head, a spring lining is arranged in the protection mechanism, a moving inner cavity and a valve ball are arranged in the valve body, and a spring lining is arranged between the valve ball and the cavity wall of the moving inner cavity. The valve ball is limited and protected by the protection mechanism and does non-contact movement with the cavity wall of the moving inner cavity and the plunger head. Through the protection mechanism and the spring bushing in the protection mechanism, the valve ball is not in direct contact with the inner wall of the valve body and the plunger head, and the problems of breakage and untight sealing caused by collision and friction between the valve body and the valve ball are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of oil well pumps for production equipment in the petroleum industry, in particular to an anti-break cover for an oil well pump. Background Art

[0002] As a key piece of mechanical oil production equipment, the oil well pump plays a crucial role in oilfield development and production. With the continued advancement of oilfield development, pump plunger head fractures are a common occurrence, seriously impacting crude oil production. The upper valve caps used in oilfields primarily consist of an upper joint, a fluid outlet, an upper valve ball, and a ball seat. These caps are monolithic, with a hollow, four-petal plum blossom-shaped cross-section. The "petals" serve as flow channels, and the valve ball moves within the "core." During the pumping process, the internal valve ball moves randomly, causing contact and friction with the valve cap, and even collisions.

[0003] In the prior art, a Chinese utility model patent with authorization announcement number CN209743138U discloses a device for preventing the plunger head of an oil well pump from breaking off. This device installs a valve ball in a valve body, and a liquid outlet joint with a liquid flow hole is specially connected to the upper part of the valve body. A partition is used to block the valve ball in the valve body below the liquid outlet joint, protecting the liquid outlet joint with the liquid flow hole from impact. However, this can cause the valve ball to frequently impact the partition, resulting in deformation and leakage of the valve ball. In severe cases, the valve ball can break the partition, causing the valve cover to break off.

[0004] A Chinese utility model patent with authorization publication number CN215927748U discloses a valve cover for a wellbore pump plunger head. The valve cover comprises an upper ball retainer and a lower ball seat spaced vertically within a main cylinder. The space between the upper ball retainer and the lower ball seat forms a movable inner cavity for the upper valve ball. While the structure is simple, the internal valve ball still frequently collides with other workpieces, causing deformation and a poor seal within the working environment.

[0005] In summary, in the prior art, there are frequent collisions and frictions between the valve body valve ball and the valve cover, which may cause the valve body to break or the valve ball to deform, thereby shortening the service life and causing problems of poor sealing. Utility Model Content

[0006] The utility model provides an anti-breakage cover for an oil pump, which can alleviate the problems in the prior art of the valve body being broken and poorly sealed due to collision and friction between the valve body and the valve ball.

[0007] In order to alleviate the above technical problems, the technical solution provided by the present invention is:

[0008] It includes a plunger head and a valve body, the plunger head and the valve body are connected, a protective mechanism is arranged between the valve body and the plunger head, the protective mechanism contains the spring lining, a movable inner cavity and a valve ball are arranged inside the valve body, the spring lining is arranged between the valve ball and the wall of the movable inner cavity, when liquid enters the valve body, the valve ball is protected by the protective mechanism and moves without contact with the wall of the movable inner cavity and the plunger head.

[0009] Furthermore, the protective mechanism also includes a valve seat and a limit rod. When the plunger head and the valve body are connected, the limit rod is placed horizontally in the movable inner cavity, the valve ball is sealed on the valve seat through hole, and one end of the spring liner is in contact with the valve seat and embedded in the movable inner cavity.

[0010] Furthermore, a liquid inlet hole is provided on the valve body, and the liquid inlet hole is located at the end of the protective mechanism facing away from the plunger head. When liquid is taken into the valve body, the valve ball moves in the inner ring of the spring lining, and the movable inner cavity is connected to the liquid inlet hole.

[0011] Furthermore, a positioning step is provided between the liquid inlet hole and the movable inner cavity, and the valve seat is clamped on the positioning step.

[0012] Furthermore, the plunger head is provided with a lower joint, the lower joint is threaded, and the plunger head is connected to one end of the valve body through the lower joint.

[0013] Furthermore, an inner screw hole is provided on the lower joint, and the inner screw hole passes through the outer wall of the lower joint in the radial direction.

[0014] Furthermore, both ends of the limiting rod are connected to the inner screw hole through threads, and the limiting rod separates the valve ball and the lower joint.

[0015] Furthermore, a connecting thread is provided at one end of the valve body close to the lower joint, the lower joint is inserted into the interior of the valve body through the connecting thread, and one end of the spring liner abuts against the lower joint.

[0016] Furthermore, the plunger head is provided with a plurality of liquid outlet holes, and the liquid outlet holes are evenly distributed on the outer wall of the plunger head in a circumferential direction.

[0017] Furthermore, the plunger head is provided with an upper joint, the interior of the upper joint is provided with an internal thread, and the upper joint is connected to the sucker rod.

[0018] The beneficial effects of the oil pump anti-break cover in this utility model are analyzed as follows:

[0019] The utility model discloses an anti-break cover for an oil pump, comprising a plunger head and a valve body, the plunger head and the valve body being connected, a protective mechanism being arranged between the valve body and the plunger head, a spring lining being arranged in the protective mechanism, a movable inner cavity and a valve ball being arranged inside the valve body, a spring lining being arranged between the valve ball and the wall of the movable inner cavity, and when liquid enters the valve body, the valve ball is protected by the protective mechanism and moves without contact with the wall of the movable inner cavity and the plunger head.

[0020] During the downstroke of the oil well pump, the valve ball moves in the movable cavity, and the protective mechanism on the plunger head contacts the valve ball, preventing the valve ball from getting stuck in the joint and unable to fall back. During the upstroke of the oil well pump or when it stops working, the valve ball blocks the interior of the valve body. The valve ball and the spring liner form a line contact at an arc angle, limiting the valve ball's radial movement along the valve body and contact with the inner wall of the valve body.

[0021] Through the protective mechanism and the spring bushing inside the protective mechanism, the valve ball does not directly contact the inner wall of the valve body and the plunger head, eliminating the impact force of the valve ball on the valve body, avoiding stress concentration and deformation of the valve ball, and solving the problems of valve body breakage and poor sealing due to collision and friction with the valve ball; at the same time, the vibration generated when the valve ball contacts the spring lining can effectively eliminate the sand wax adhering to the valve ball. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in related technologies, the following briefly introduces the drawings required for use in the specific implementation methods or related technical descriptions. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 A schematic structural diagram of a protection mechanism provided by an embodiment of the present utility model;

[0024] Figure 2 A schematic structural diagram of a plunger head provided in an embodiment of the present utility model;

[0025] Figure 3 A schematic structural diagram of a valve body provided in an embodiment of the present utility model;

[0026] Figure 4 A schematic structural diagram of a valve body valve cover provided in an embodiment of the utility model.

[0027] icon:

[0028] 100- plunger head; 200- valve body; 300- protection mechanism; 001- moving inner cavity; 210- valve ball; 310- spring lining; 320- valve seat; 330- limit rod; 220- positioning step; 230- connecting thread; 110- lower joint; 002- internal screw hole; 003- liquid inlet hole; 120- liquid outlet hole; 130- upper joint. DETAILED DESCRIPTION

[0029] Example 1

[0030] This embodiment provides a pump break-proof cover, please refer to Figures 1-4 , including a plunger head 100 and a valve body 200, the plunger head 100 and the valve body 200 are connected, a protective mechanism 300 is arranged between the valve body 200 and the plunger head 100, a spring lining 310 is arranged in the protective mechanism 300, a floating inner cavity 001 and a valve ball 210 are arranged inside the valve body 200, a spring lining 310 is arranged between the valve ball 210 and the wall of the floating inner cavity 001, when the valve body 200 is filled with liquid, the valve ball 210 is limited and protected by the protective mechanism 300 and has no contact movement with the wall of the floating inner cavity 001 and the plunger head 100.

[0031] During the downstroke of the oil well pump, the valve ball 210 moves within the movable inner cavity 001. The protective mechanism 300 provided on the plunger head 100 contacts the valve ball 210, preventing the valve ball 210 from becoming stuck in the joint of the plunger head 100 and being unable to fall back. During the upstroke or shutdown of the oil well pump, the valve ball 210 blocks the internal pipe opening of the valve body 200. The valve ball 210 and the spring liner 310 form a linear contact at an arc angle, limiting the valve ball 210 from moving radially along the valve body 200 and contacting the inner wall of the valve body 200.

[0032] Through the protective mechanism 300 and the spring liner in the protective mechanism 300, the valve ball 210 does not directly contact the inner wall of the valve body 200 and the plunger head 100, thereby eliminating the impact force of the valve ball 210 on the valve body 200, avoiding stress concentration and deformation of the valve ball 210, and solving the problem of breakage and poor sealing of the valve body 200 due to collision and friction with the valve ball 210; at the same time, the vibration generated when the valve ball 210 contacts the spring liner 310 can effectively eliminate the sand wax adhering to the valve ball 210.

[0033] In this embodiment, the protective mechanism 300 also includes a valve seat 320 and a limit rod 330; when the plunger head 100 and the valve body 200 are connected, the limit rod 330 is placed horizontally in the floating inner cavity 001, the valve ball 210 is sealed on the through hole of the valve seat 320, and one end of the spring lining 310 is in contact with the valve seat 320 and embedded in the floating inner cavity 001.

[0034] In the optional scheme of this embodiment, it is more preferred that the valve seat 320 is used to receive the valve ball 210, which is a cylindrical structure. The outer circumferential surface of one end of the valve seat 320 is a conical surface, which cooperates with the outer conical surface of the boss on the positioning step 220. The limiting rod 330 is a cylindrical rod with external threads at both ends, which is spirally assembled with the internal screw hole 002; when the plunger head 100 and the valve body 200 are connected, the protective mechanism 300 composed of the valve seat 320, the spring lining 310 and the limiting rod 330 covers the valve ball 210. When the valve body 200 is filled with liquid, the protective mechanism 300 blocks the contact between the inner wall of the movable cavity and the spherical surface of the valve ball 210, thereby playing a protective and cleaning role.

[0035] In this embodiment, a liquid inlet hole 003 is also provided on the valve body 200, and the liquid inlet hole 003 is located at the end of the protective mechanism 300 facing away from the plunger head 100; when liquid enters the valve body 200, the valve ball 210 moves in the inner circle of the spring lining 310, and the movable inner cavity 001 is connected to the liquid inlet hole 003.

[0036] Among the optional solutions of this embodiment, it is more preferred that when the oil pump plunger head 100 moves upward, the valve ball 210 is tightly pressed against the valve seat 320, blocking the liquid inlet hole 003, so that the liquid on the pump is lifted to the ground through the liquid outlet hole 120; when the oil pump plunger head 100 moves downward, the valve ball 210 rises and leaves the valve seat 320, the liquid inlet hole 003 is opened, and the liquid flows through the valve body 200, the floating inner cavity 001 and the lower joint 110 of the plunger head 100 into the space above the pump.

[0037] In this embodiment, a positioning step 220 is further provided between the liquid inlet hole 003 and the movable inner cavity 001 ; the valve seat 320 is snapped onto the positioning step 220 .

[0038] In the optional scheme of this embodiment, it is more preferred that a positioning step 220 is provided at the top of the internal thread section at one end of the valve body 200, and the end face of the positioning step 220 close to the movable inner cavity 001 is a conical surface, so that the conical end face of the valve seat 320 sits on the positioning step 220, and the positioning step 220 and the limit rod 330 are arranged at intervals in the upper and lower directions.

[0039] In this embodiment, the plunger head 100 is provided with a lower joint 110 . The lower joint 110 has threads, and the plunger head 100 is connected to one end of the valve body 200 through the lower joint 110 .

[0040] In this embodiment, an inner screw hole 002 is provided on the lower joint 110 , and the inner screw hole 002 passes through the outer wall of the lower joint 110 in the radial direction.

[0041] In this embodiment, both ends of the limiting rod 330 are connected to the inner screw hole 002 through threads, and the limiting rod 330 separates the valve ball 210 and the lower joint 110.

[0042] In this embodiment, a connecting thread 230 is provided at one end of the valve body 200 close to the lower joint 110 , and the lower joint 110 is inserted into the interior of the valve body 200 through the connecting thread 230 , and one end of the spring liner 310 abuts against the lower joint 110 .

[0043] In the optional scheme of this embodiment, it is more preferred that the spring lining 310 serves to limit the lateral movement of the valve ball 210, the valve ball 210 and the spring lining 310 are in linear contact at an arc angle, the hardness of the spring lining 310 material is much higher than that of the valve ball 210, and the valve ball 210 does not directly contact the inner wall of the valve cover and the plunger head 100.

[0044] In this embodiment, the plunger head 100 is provided with a plurality of liquid outlet holes 120 , and the liquid outlet holes 120 are evenly distributed on the outer wall of the plunger head 100 in the circumferential direction.

[0045] In this embodiment, the plunger head 100 is provided with an upper joint 130 , the interior of the upper joint 130 is provided with an internal thread, and the upper joint 130 is connected to the sucker rod.

[0046] In the optional scheme of this embodiment, it is more preferred that the main body of the plunger head 100 is cylindrical, and the column 1 is divided into three sections: upper, middle and lower. A plurality of liquid outlet holes 120 are provided on the wall of the middle section of the cylinder, and the liquid outlet holes 120 are evenly spaced in the circumferential direction of the plunger head 100 connecting to the middle section of the cylinder. A lower joint 110 is provided at one end of the plunger head 100, and an upper joint 130 is provided at the other end of the plunger head 100. The outer circumference of the lower joint 110 is provided with an external thread, and an internal screw hole 002 is opened on the outer wall of the lower joint 110 running through the upper and lower parts. The external threads at the upper and lower ends of the limiting rod 330 are fixed to the lower joint 110 through the internal screw hole 002, and the inner circumference of the upper joint 130 is provided with an internal thread, which is connected to the sucker rod.

[0047] Among the optional schemes of this embodiment, it is more preferred that the protective mechanism 300 and the oil pump anti-break cover both adopt a split structure, and a spring lining 310 is added inside to prevent the valve ball 210 from contacting the valve body 200. During the operation of the valve ball 210, the inner wall of the valve body 200 is only subjected to the impact of alternating loads and liquid flow; and the added spring lining 310 also plays a role in reducing friction. At the same time, during the up and down movement, the spring lining 310 can remove foreign matter on the valve ball 210. After being limited by the limit rod 330, the valve ball 210 will not hit the lower joint 110 interface of the plunger head 100 and get stuck during operation.

[0048] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but not limited to them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A wellbore pump anti-break cover, characterized by: It includes a plunger head (100) and a valve body (200); The plunger head (100) is connected to the valve body (200); A protection mechanism (300) is provided between the valve body (200) and the plunger head (100); a spring lining (310) is provided in the protection mechanism (300); The valve body (200) is provided with a movable inner cavity (001) and a valve ball (210); The spring lining (310) is provided between the valve ball (210) and the wall of the movable inner cavity (001). When liquid enters the valve body (200), the valve ball (210) is protected by the protection mechanism (300) and moves without contact with the wall of the movable inner cavity (001) and the plunger head (100).

2. The oil well pump anti-break cover according to claim 1, characterized in that: The protection mechanism (300) further includes a valve seat (320) and a limiting rod (330); When the plunger head (100) and the valve body (200) are connected, the limiting rod (330) is placed horizontally in the movable inner cavity (001), the valve ball (210) is blocked on the through hole of the valve seat (320), and one end of the spring liner (310) is in contact with the valve seat (320) and embedded in the movable inner cavity (001).

3. The oil well pump anti-break cover according to claim 2, characterized in that: The valve body (200) is further provided with a liquid inlet hole (003), and the liquid inlet hole (003) is located at an end of the protection mechanism (300) facing away from the plunger head (100); When liquid enters the valve body (200), the valve ball (210) moves in the inner circle of the spring lining (310), and the movable inner cavity (001) is connected to the liquid inlet hole (003).

4. The oil well pump anti-break cover according to claim 3, characterized in that: A positioning step (220) is further provided between the liquid inlet hole (003) and the swimming inner cavity (001); The valve seat (320) is clamped on the positioning step (220).

5. The oil well pump anti-break cover according to claim 4, characterized in that: The plunger head (100) is provided with a lower joint (110), the lower joint (110) having threads, and the plunger head (100) is connected to one end of the valve body (200) through the lower joint (110).

6. The oil well pump anti-break cover according to claim 5, characterized in that: An inner screw hole (002) is provided on the lower joint (110), and the inner screw hole (002) penetrates the outer wall of the lower joint (110) in the radial direction.

7. The oil well pump anti-break cover according to claim 6, characterized in that: Both ends of the limiting rod (330) are connected to the inner screw hole (002) via threads, and the limiting rod (330) separates the valve ball (210) and the lower joint (110).

8. The oil well pump anti-break cover according to claim 7, characterized in that: A connecting thread (230) is provided at one end of the valve body (200) close to the lower joint (110); the lower joint (110) is plugged into the interior of the valve body (200) via the connecting thread (230); and one end of the spring liner (310) abuts against the lower joint (110).

9. The oil well pump anti-break cover according to claim 8, characterized in that: The plunger head (100) is provided with a plurality of liquid outlet holes (120), and the liquid outlet holes (120) are evenly distributed on the outer wall of the plunger head (100) in the circumferential direction.

10. The oil well pump anti-break cover according to claim 9, characterized in that: The plunger head (100) is provided with an upper joint (130), the interior of the upper joint (130) is provided with an internal thread, and the upper joint (130) is connected to the sucker rod.

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