Anti-theft valve for petroleum wellhead

Abstract

The invention discloses an anti-theft valve for a petroleum wellhead, and relates to the technical field of anti-theft valves. The pressure-bearing ball plug comprises a ball plug body, the outer surface of the ball plug body is rotationally connected with the inner wall of a valve body, the inner wall of the ball plug body is fixedly connected with a calandria, the calandria is formed by arranging honeycomb-shaped pipelines, and due to the honeycomb-shaped arrangement, all parts can uniformly bear pressure, and a better pressure-bearing effect is achieved; the ball plug can be supported, so that the ball plug is prevented from being damaged due to the fact that the ball plug is extruded by oil pressure, the discharge pipe achieves the purpose of communicating the valve body to adjust flow when the ball plug is opened, and achieves the purpose of supporting the ball plug to protect the ball plug from being damaged when the ball plug is closed. Compared with a lifting type valve, the ball plug is rotationally closed and is not limited to be installed on a horizontal pipeline.

Description

Technical Field

[0001] The present invention relates to the technical field of anti-theft valves, and particularly relates to an anti-theft valve for an oil wellhead. Background Art

[0002] Oil is a viscous, dark brown liquid, known as the "blood of industry", which is widely used in daily life and production. It is one of the main objects of geological exploration. Oil is a non-renewable energy source with a long formation time. Therefore, the global oil extraction supply far exceeds the demand, keeping the oil price high. The general extraction method is to drill wells on the oil field and pump the oil through pumps. Since the general oil wellhead is open, oil may be stolen by people, affecting the supply and demand relationship of oil in society. Therefore, it is necessary to install a valve at the oil wellhead for anti-theft. A swing check valve is not suitable for working conditions with high viscosity or containing solid particles, otherwise it will cause the check valve to open sluggishly, unable to achieve complete sealing, and the check of the fluid will not be reliable enough. A lift check valve has a good sealing effect, but its placement orientation is restricted and cannot be placed randomly. Therefore, a check valve is needed that is not restricted in orientation, has a good sealing effect and can prevent theft. So we have proposed an anti-theft valve for an oil wellhead. Summary of the Invention

[0003] To solve the above technical problems, the present invention provides an anti-theft valve for an oil wellhead, including a valve body. The top of the valve body is fixedly connected to a valve cover by bolts. An adjustment mechanism and an anti-theft mechanism are provided inside the valve body, and the adjustment mechanism is arranged in the middle of the valve body, and the anti-theft mechanism is arranged on one side of the oil outlet end of the valve body; Adjustment mechanism. The adjustment mechanism has a ball plug. The outer surface of the ball plug is rotatably connected to the inner wall of the valve body. A discharge pipe is fixedly connected to the inner wall of the ball plug. The discharge pipe is arranged by arranging honeycomb-shaped pipes. One side of the ball plug close to the valve cover is fixedly connected to a block. The block is fixedly connected to a rotating shaft on the side away from the ball plug. A motor is arranged on the side of the rotating shaft away from the block, and the output end of the motor is fixedly connected to the rotating shaft. Starting the motor, the output end of the motor drives the rotating shaft to rotate. The rotating shaft rotates, driving the block to rotate. The block rotates to drive the ball plug to rotate. The ball plug rotates, thereby adjusting the flow rate of the discharge pipe, so as to achieve the purpose of adjusting the flow rate of the valve body. The discharge pipe is arranged by arranging honeycomb-shaped pipes. The honeycomb-shaped arrangement can make each part bear pressure evenly and has a better pressure-bearing effect. When the ball plug is closed, it can support the ball plug, thereby preventing the ball plug from being damaged by the oil pressure extrusion. The discharge pipe serves the purpose of connecting the valve body to adjust the flow rate when the ball plug is opened, and serves the purpose of supporting the ball plug to protect the ball plug from being damaged when the ball plug is closed. Compared with the swing valve, the structure of the present invention is simple and can be made into a small diameter. Compared with the lift valve, the ball plug rotates to close and does not have to be limited to being installed on a horizontal pipe.

[0004] Furthermore, a first valve seat and a second valve seat are fixedly connected to the inner wall of the valve body. The inner walls of the first valve seat and the second valve seat are rotatably connected to the outer surface of the ball plug. Both the first valve seat and the second valve seat are made of metal and are in sealing contact with the ball plug. By providing the first valve seat and the second valve seat, the two sides of the ball plug are sealed. Compared with the traditional single-valve seat structure, it has a better sealing effect and will not cause oil leakage.

[0005] Furthermore, a filling plate is arranged at the interval between the drain pipe and the ball plug. The outer surface of the filling plate is fixedly connected to the sides of the ball plug and the drain pipe that are close to each other. The filling plate fills the inside of the ball plug and the gap between the drain pipe and the ball plug, preventing oil from leaking through the gap between the two.

[0006] Furthermore, a ring groove is formed on the outer surface of the block, and the block is rotationally adapted to the inner wall of the valve body through the ring groove. By providing the ring groove, the rotation of the block is restricted, preventing the vibration generated during the operation of the motor from driving the block to vibrate, which would cause the ball plug to swing when rotating, resulting in friction with the first valve seat and the second valve seat. This avoids frictional wear of the first valve seat and the second valve seat, ensuring their sealing effect. At the same time, the ring groove can also seal the inner cavity of the valve body near the valve cover, preventing oil from entering and contaminating the internal actuator, thus avoiding damage to the actuator connected to the valve cover.

[0007] Furthermore, a sealing cover is fixedly connected to the side of the motor away from the rotating shaft, and the outer surface of the sealing cover is trapezoidal. The side of the sealing cover away from the motor is fixedly connected to the valve cover. The trapezoidal sealing cover connected to the valve cover can increase the bearing area at the bottom of the valve cover when the valve cover is subjected to external pressure or impact, making the valve cover not easily damaged by violence, thus preventing thieves from stealing oil through the valve cover. At the same time, the trapezoidal sealing cover, after being connected to the inner wall of the valve body, can form multiple contact surfaces to achieve the effect of multiple seals, increasing the sealing performance of the valve cover, further protecting the actuator at the bottom of the valve cover, and ensuring the service life of this valve.

[0008] Furthermore, the anti-theft mechanism includes a reinforcement ring. The reinforcement ring is arranged on the side of the valve body close to the second valve seat, and the inner wall of the reinforcement ring is fixedly connected to the outer surface of the valve body. Other components of the anti-theft mechanism are arranged at the position of the valve body inside the reinforcement ring, which reduces the strength of this part of the valve body. The setting of the reinforcement ring protects this part and prevents damage caused by the pressure generated by the flow of oil in the inner cavity of the valve body.

[0009] Furthermore, a groove is provided on the inner side of the reinforcing ring. The groove is annularly formed on the outer surface of the valve body. A plug and a flow velocity meter are respectively slidably connected to the inner wall of the valve body. The volume of the plug is much larger than that of the flow velocity meter. The inner cavities of the valve body where the plug and the flow velocity meter are located are both communicated with the groove. When the oil fluid flows through the inner cavity of the valve body, the internal pressure rises, and the plug and the flow velocity meter are subjected to pressure. Since the volume of the plug is much larger than that of the flow velocity meter, the plug moves towards the inside of the groove, thereby compressing the air inside the groove, causing the flow velocity meter to extend out, detecting the flow velocity of the oil fluid, and thus detecting the exploitation of the oil fluid at all times, being able to timely discover the theft of the oil fluid, and thus achieving an anti-theft effect.

[0010] Furthermore, a shielding plate is provided on the side of the flow velocity meter away from the plug. The outer surface of the shielding plate is fixedly connected to the inner wall of the valve body. And the side of the shielding plate away from the flow velocity meter is provided as a reflective slope surface. By providing the shielding plate, the flow velocity meter is shielded to prevent thieves from discovering it. Thus, when they steal oil, it can be detected and reported in a timely manner. At the same time, the design of the reflective slope surface can reflect the inner wall of the valve body, thereby imitating and disguising, and further preventing the flow velocity meter from being discovered by the thieves.

[0011] Furthermore, a housing is fixedly connected to the inner wall of the groove. An airbag is fixedly connected to the inner wall of the housing. And the inner cavity of the airbag is communicated with the inner cavity where the flow velocity meter is located. When the airbag is compressed, the gas inside the airbag pushes the flow velocity meter to slide out, thereby detecting and reporting the oil flow rate.

[0012] Furthermore, a connecting block is fixedly connected to the side of the plug close to the reinforcing ring. A rotating arm is fixedly connected to the side of the connecting block away from the plug. The side of the rotating arm away from the connecting block is fixedly connected to the airbag. And the outer surface of the rotating arm is limited and slidable on the inner wall of the housing. The position of the rotating arm biased towards the airbag is rotatably connected to a rotating seat through a rotating rod. And the outer surface of the rotating seat is fixedly connected to the reinforcing ring. When the plug moves, it drives the connecting block to move, thereby driving the rotating arm to rotate with the rotating seat as a fulcrum, thereby compressing the airbag. Since the rotating seat is arranged at a position biased towards the airbag, the force arm on the side of the rotating arm close to the airbag is shorter. According to the lever principle, the pressure received by the airbag is increased, thereby accelerating the sliding out of the flow velocity meter, detecting the oil flow rate more quickly, increasing the sensitivity of the anti-theft mechanism to start, and thus reducing the loss of oil.

[0013] The beneficial effects of the present invention are as follows: 1. In the present invention, by providing a ball plug, the drain pipe is formed by arranging honeycomb-shaped pipes. The honeycomb-shaped arrangement enables each part to bear pressure evenly, having a better pressure-bearing effect. When the ball plug is closed, it can support the ball plug, thereby preventing the ball plug from being damaged due to oil pressure extrusion. The drain pipe serves the purpose of connecting the valve body to adjust the flow rate when the ball plug is opened, and serves the purpose of supporting the ball plug to protect it from being damaged when the ball plug is closed. Compared with swing check valves, the structure of the present invention is simple and can be made into small diameters. Compared with lift check valves, the ball plug rotates to close, and it does not have to be limited to being installed on horizontal pipes.

[0014] 2. In the present invention, by providing a ring groove and opening the ring groove, the rotation of the block is restricted, preventing the vibration generated during the operation of the motor from driving the block to vibrate, thereby causing the ball plug to swing when rotating, resulting in friction with the first valve seat and the second valve seat, and avoiding frictional wear of the first valve seat and the second valve seat, thereby ensuring its sealing effect. At the same time, the ring groove can also seal the inner cavity of the valve body near the valve cover, preventing oil from entering and soaking the internal actuator, thereby avoiding damage to the actuator connected to the valve cover.

[0015] 3. In the present invention, by providing a sealing cover, the stepped sealing cover is connected to the valve cover, which can increase the pressure-bearing area at the bottom of the valve cover when the valve cover is subjected to external pressure or impact, so that the valve cover is not easily damaged violently, thereby preventing thieves from stealing oil through the valve cover. At the same time, the stepped sealing cover, after being connected to the inner wall of the valve body, can form multiple contact surfaces to achieve the effect of multiple seals, thereby increasing the sealing performance of the valve cover, further protecting the actuator at the bottom of the valve cover, and ensuring the service life of this valve.

[0016] 4. In the present invention, by providing a velocity flowmeter, the velocity flowmeter extends out to detect the flow velocity of the oil, thereby detecting the exploitation of the oil in real time, being able to promptly discover the theft of the oil, thus playing an anti-theft role. The rotating seat is arranged at a position biased towards the airbag, making the lever arm on the side of the rotating arm close to the airbag shorter. According to the lever principle, the pressure on the airbag is increased, thereby accelerating the sliding out of the velocity flowmeter, thus detecting the oil flow more quickly, increasing the sensitivity of the anti-theft mechanism to start, and thus reducing oil losses.

[0017] 5. In the present invention, by providing a baffle, the baffle shields the velocity flowmeter to prevent thieves from discovering it, so that it can be detected and reported in a timely manner when they steal oil. At the same time, the design of the reflective slope surface can reflect the inner wall of the valve body, thereby imitating and disguising, further preventing the velocity flowmeter from being discovered by thieves. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic diagram of an anti-theft valve for an oil wellhead according to the present invention; Figure 2 is a schematic cross-sectional structure diagram of the valve body of the present invention; Figure 3 Schematic structural diagram of the adjustment mechanism of the present invention; Figure 4 Schematic structural diagram of the pipe arrangement of the present invention; Figure 5 Schematic structural diagram of the annular groove of the present invention; Figure 6 Schematic structural diagram of the reinforcement plate of the present invention; Figure 7 Schematic structural diagram of the rotating arm of the present invention; Figure 8 Schematic structural diagram of the shielding plate of the present invention; Figure 9 For the present invention Figure 8 Enlarged view of part A.

[0019] In the figure: 1, valve body; 2, valve cover; 3, adjustment mechanism; 31, ball plug; 32, pipe arrangement; 33, second valve seat; 34, first valve seat; 35, block; 36, rotating shaft; 37, motor; 38, filling plate; 39, annular groove; 310, sealing cover; 4, anti-theft mechanism; 41, reinforcing ring; 42, groove body; 43, plug block; 44, connecting block; 45, rotating arm; 46, rotating seat; 47, outer shell; 48, shielding plate; 49, airbag; 411, flow velocity meter. Detailed implementation manners

[0020] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation manners. The embodiments of the present invention are given for the purpose of illustration and description, and are not exhaustive or limit the present invention to the disclosed form. Many modifications and variations will be obvious to those of ordinary skill in the art. The embodiments are selected and described to better illustrate the principles and practical applications of the present invention, and enable those of ordinary skill in the art to understand the present invention and thus design various embodiments with various modifications suitable for specific purposes.

[0021] Embodiment 1, please refer to Figures 1 - 5 , the present invention is an anti-theft valve for an oil wellhead, including a valve body 1, the top of the valve body 1 is fixedly connected with a valve cover 2 by bolts, an adjustment mechanism 3 and an anti-theft mechanism 4 are arranged inside the valve body 1, and the adjustment mechanism 3 is arranged in the middle of the valve body 1, and the anti-theft mechanism 4 is arranged on one side of the oil outlet end of the valve body 1; Adjusting mechanism 3, the adjusting mechanism 3 has a ball plug 31, the outer surface of the ball plug 31 is rotatably connected to the inner wall of the valve body 1, a drain pipe 32 is fixedly connected to the inner wall of the ball plug 31, the drain pipe 32 is arranged by honeycomb-shaped pipes, a block 35 is fixedly connected to the side of the ball plug 31 close to the valve cover 2, a rotating shaft 36 is fixedly connected to the side of the block 35 away from the ball plug 31, a motor 37 is arranged on the side of the rotating shaft 36 away from the block 35, and the output end of the motor 37 is fixedly connected to the rotating shaft 36. Starting the motor 37, the output end of the motor 37 drives the rotating shaft 36 to rotate. When the rotating shaft 36 rotates, it drives the block 35 to rotate. When the block 35 rotates, it drives the ball plug 31 to rotate. When the ball plug 31 rotates, the flow rate of the drain pipe 32 is adjusted, so as to achieve the purpose of adjusting the flow rate of the valve body 1. The drain pipe 32 is arranged by honeycomb-shaped pipes. The honeycomb-shaped arrangement can make each part bear pressure evenly and has a better pressure-bearing effect. When the ball plug 31 is closed, it can support the ball plug 31, so as to avoid the ball plug 31 being damaged by the oil pressure extrusion. The drain pipe 32 serves the purpose of connecting the valve body 1 to adjust the flow rate when the ball plug 31 is opened, and serves the purpose of supporting the ball plug 31 to protect the ball plug 31 from being damaged when the ball plug 31 is closed. Compared with swing check valves, the structure of the present invention is simple and can be made into a small diameter. Compared with lift check valves, the ball plug 31 rotates to close and does not have to be limited to being installed on a horizontal pipeline.

[0022] A first valve seat 34 and a second valve seat 33 are fixedly connected to the inner wall of the valve body 1. The inner walls of the first valve seat 34 and the second valve seat 33 are both rotatably connected to the outer surface of the ball plug 31. The first valve seat 34 and the second valve seat 33 are both made of metal material and are in sealed contact with the ball plug 31. By setting the first valve seat 34 and the second valve seat 33, the two sides of the ball plug 31 are sealed. Compared with the traditional single valve seat structure, it has a better sealing effect and will not cause oil leakage.

[0023] A filling plate 38 is arranged at the interval between the drain pipe 32 and the ball plug 31. The outer surface of the filling plate 38 is fixedly connected to the sides of the ball plug 31 and the drain pipe 32 close to each other. The filling plate 38 fills the inside of the ball plug 31 and fills the gap between the drain pipe 32 and the ball plug 31 to prevent oil from leaking from the gap between the two.

[0024] An annular groove 39 is formed on the outer surface of the block 35, and the block 35 is rotationally adapted to the inner wall of the valve body 1 through the annular groove 39. By providing the annular groove 39, the rotation of the block 35 is restricted, avoiding the vibration of the block 35 driven by the vibration generated when the motor 37 works, so as to prevent the ball plug 31 from swinging when rotating, causing friction with the first valve seat 34 and the second valve seat 33, and avoiding frictional wear of the first valve seat 34 and the second valve seat 33, thereby ensuring its sealing effect. At the same time, the annular groove 39 can also seal the inner cavity of the valve body 1 close to the valve cover 2 to prevent oil from entering and contaminating the internal actuator, so as to avoid damage to the actuator connected to the valve cover 2.

[0025] On one side of the motor 37 away from the rotating shaft 36, a sealing cover 310 is fixedly connected. The outer surface of the sealing cover 310 is in a stepped shape. The side of the sealing cover 310 away from the motor 37 is fixedly connected to the valve cover 2. The stepped sealing cover 310 is connected to the valve cover 2, which can increase the pressure-bearing area at the bottom of the valve cover 2 when the valve cover 2 is subjected to external pressure or impact, so that the valve cover 2 is not easily damaged by violence, thereby preventing thieves from stealing oil through the valve cover 2. At the same time, the stepped sealing cover 310 can form multiple contact surfaces after being connected to the inner wall of the valve body 1, achieving the effect of multiple seals, thereby increasing the sealing performance of the valve cover 2, and further protecting the actuator at the bottom of the valve cover 2 to ensure the service life of this valve.

[0026] Example 2, please refer to Figures 6 - 9 , the anti-theft mechanism 4 includes a reinforcing ring 41. The reinforcing ring 41 is arranged on one side of the valve body 1 close to the second valve seat 33, and the inner wall of the reinforcing ring 41 is fixedly connected to the outer surface of the valve body 1. Other components of the anti-theft mechanism 4 are arranged at the position of the valve body 1 inside the reinforcing ring 41, which causes the strength of this part of the valve body 1 to decrease. The setting of the reinforcing ring 41 protects this part to avoid damage caused by the pressure generated by the flow of oil in the inner cavity of the valve body 1.

[0027] A groove body 42 is arranged inside the reinforcing ring 41. The groove body 42 is annularly opened on the outer surface of the valve body 1. A plug 43 and a flow rate meter 411 are respectively slidably connected to the inner wall of the valve body 1. The volume of the plug 43 is much larger than that of the flow rate meter 411, and the inner cavities of the valve body 1 where the plug 43 and the flow rate meter 411 are located are both communicated with the groove body 42. When the oil in the inner cavity of the valve body 1 flows, the internal pressure rises, and the plug 43 and the flow rate meter 411 are subjected to pressure. Since the volume of the plug 43 is much larger than that of the flow rate meter 411, the plug 43 moves towards the inside of the groove body 42, thereby compressing the air inside the groove body 42, causing the flow rate meter 411 to protrude and detecting the flow rate of the oil, so as to detect the exploitation of the oil at all times, and being able to detect the theft of the oil in time, thus achieving an anti-theft effect.

[0028] A shielding plate 48 is arranged on the side of the flow rate meter 411 away from the plug 43. The outer surface of the shielding plate 48 is fixedly connected to the inner wall of the valve body 1, and the side of the shielding plate 48 away from the flow rate meter 411 is a reflective slope surface. By setting the shielding plate 48, the flow rate meter 411 is shielded to prevent thieves from discovering it, so that when they steal oil, it can be detected and reported in time. At the same time, the design of the reflective slope surface can reflect the inner wall of the valve body 1, thereby imitating and disguising, and further preventing the flow rate meter 411 from being discovered by the thief.

[0029] The inner wall of the tank body 42 is fixedly connected with an outer shell 47, the inner wall of the outer shell 47 is fixedly connected with an airbag 49, and the inner cavity of the airbag 49 is communicated with the inner cavity where the velocity flowmeter 411 is located. When the airbag 49 is compressed, the gas inside the airbag 49 pushes the velocity flowmeter 411 out, so as to detect and report the oil flow rate.

[0030] One side of the plug 43 close to the reinforcement ring 41 is fixedly connected with a connecting block 44. One side of the connecting block 44 away from the plug 43 is fixedly connected with a rotating arm 45. The side of the rotating arm 45 away from the connecting block 44 is fixedly connected with the airbag 49. The outer surface of the rotating arm 45 is limited and slides on the inner wall of the outer shell 47. The position of the rotating arm 45 biased towards the airbag 49 is rotationally connected with a rotating seat 46 through a rotating rod, and the outer surface of the rotating seat 46 is fixedly connected with the reinforcement ring 41. When the plug 43 moves, it drives the connecting block 44 to move, thereby driving the rotating arm 45 to rotate with the rotating seat 46 as the fulcrum, so as to compress the airbag 49. Since the rotating seat 46 is arranged at a position biased towards the airbag 49, the force arm on the side of the rotating arm 45 close to the airbag 49 is shorter. According to the lever principle, the pressure received by the airbag 49 increases, so as to accelerate the sliding out of the velocity flowmeter 411, so as to detect the oil flow rate more quickly, increase the sensitivity of the anti-theft mechanism 4 to start, and thus reduce oil loss.

[0031] During use, start the motor 37. The output end of the motor 37 drives the rotating shaft 36 to rotate. When the rotating shaft 36 rotates, it drives the block 35 to rotate. When the block 35 rotates, it drives the ball plug 31 to rotate. When the ball plug 31 rotates, the flow rate of the discharge pipe 32 is adjusted, so as to achieve the purpose of adjusting the flow rate of the valve body 1. When the oil fluid flows through the inner cavity of the valve body 1, the internal pressure rises, and the plug 43 and the velocity flowmeter 411 are under pressure. Since the volume of the plug 43 is much larger than that of the velocity flowmeter 411, the plug 43 moves towards the inside of the tank body 42. When the plug 43 moves, it drives the connecting block 44 to move, thereby driving the rotating arm 45 to rotate with the rotating seat 46 as the fulcrum, so as to compress the airbag 49. When the airbag 49 is compressed, the gas inside the airbag 49 pushes the velocity flowmeter 411 out, so as to detect and report the oil flow rate, achieving real-time detection and preventing oil theft.

[0032] Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art and related fields without creative work shall fall within the protection scope of the present invention. The structures, devices and operation methods not specifically described and explained in the present invention shall be implemented according to the conventional means in the art without special explanation and limitation.

Claims

1. An anti-theft valve for an oil wellhead, comprising a valve body (1), the top of the valve body (1) being fixedly connected to a valve cover (2) by bolts, characterized in that: An adjusting mechanism (3) and an anti-theft mechanism (4) are arranged inside the valve body (1), and the adjusting mechanism (3) is arranged in the middle of the valve body (1), and the anti-theft mechanism (4) is arranged on one side of the oil outlet end of the valve body (1); The regulating mechanism (3) comprises a ball plug (31), the outer surface of the ball plug (31) being rotatably connected to the inner wall of the valve body (1), the inner wall of the ball plug (31) being fixedly connected to a row of pipes (32), the row of pipes (32) being formed by an arrangement of honeycomb-shaped pipes, a block (35) being fixedly connected to a side of the ball plug (31) close to the valve cover (2), a rotating shaft (36) being fixedly connected to a side of the block (35) away from the ball plug (31), a motor (37) being provided on a side of the rotating shaft (36) away from the block (35), and an output end of the motor (37) being fixedly connected to the rotating shaft (36).

2. The anti-theft valve for oil wellhead according to claim 1, characterized in that: The inner wall of the valve body (1) is fixedly connected to a first valve seat (34) and a second valve seat (33); the inner walls of the first valve seat (34) and the second valve seat (33) are both rotatably connected to the outer surface of the ball plug (31); the first valve seat (34) and the second valve seat (33) are both made of metal material and are in sealing contact with the ball plug (31).

3. The anti-theft valve for oil wellhead according to claim 2, characterized in that: A filling plate (38) is provided between the row pipe (32) and the ball plug (31), and the outer surface of the filling plate (38) is fixedly connected to the side of the ball plug (31) and the row pipe (32) that are close to each other, and the filling plate (38) fills the interior of the ball plug (31).

4. The anti-theft valve for oil wellhead according to claim 3, characterized in that: An annular groove (39) is provided on the outer surface of the block (35), and the block (35) and the inner wall of the valve body (1) are rotatably matched with each other through the annular groove (39).

5. The anti-theft valve for oil wellhead according to claim 4, characterized in that: A sealing cover (310) is fixedly connected to a side of the motor (37) away from the rotating shaft (36), and an outer surface of the sealing cover (310) is arranged in a stepped shape. A side of the sealing cover (310) away from the motor (37) is fixedly connected to the valve cover (2).

6. The anti-theft valve for oil wellhead according to claim 5, characterized in that: The anti-theft mechanism (4) comprises a reinforcement ring (41), the reinforcement ring (41) being arranged on a side of the valve body (1) close to the second valve seat (33), and the inner wall of the reinforcement ring (41) being fixedly connected to the outer surface of the valve body (1).

7. The anti-theft valve for oil wellhead according to claim 6, characterized in that: A groove body (42) is provided on the inner side of the reinforcement ring (41); the groove body (42) is annularly opened on the outer surface of the valve body (1); a plug block (43) and a velocity flow meter (411) are slidably connected to the inner wall of the valve body (1); the volume of the plug block (43) is much larger than that of the velocity flow meter (411); and the inner cavity of the valve body (1) where the plug block (43) and the velocity flow meter (411) are located are both connected to the groove body (42).

8. The anti-theft valve for oil wellhead according to claim 7, characterized in that: A shield plate (48) is provided on a side of the velocity flow meter (411) away from the plug (43); an outer surface of the shield plate (48) is fixedly connected to an inner wall of the valve body (1); and a side of the shield plate (48) away from the velocity flow meter (411) is provided as a reflective slope.

9. The anti-theft valve for oil wellhead according to claim 8, characterized in that: The inner wall of the groove body (42) is fixedly connected to a shell (47), the inner wall of the shell (47) is fixedly connected to an airbag (49), and the inner cavity of the airbag (49) is in communication with the inner cavity where the velocity flow meter (411) is located.

10. The anti-theft valve for oil wellhead according to claim 9, characterized in that: A connecting block (44) is fixedly connected to a side of the plug block (43) close to the reinforcement ring (41); a rotating arm (45) is fixedly connected to a side of the connecting block (44) away from the plug block (43); a side of the rotating arm (45) away from the connecting block (44) is fixedly connected to an airbag (49); an outer surface of the rotating arm (45) slides with an inner wall of a housing (47) in a limited manner; a position of the rotating arm (45) biased toward the airbag (49) is rotatably connected to a rotating seat (46) via a rotating rod; and an outer surface of the rotating seat (46) is fixedly connected to the reinforcement ring (41).

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