Ball valve electric actuator with pressure protection function

Abstract

The utility model provides a ball valve electric actuator with a pressure protection function. An output shaft can rotate relative to a box body so that the ball valve electric actuator can be opened or closed. A first gear is mounted on the output shaft; the rack is movably mounted on the box body and is meshed with the first gear; the energy storage spring is connected with the rack and used for driving the rack to move. The locking mechanism is used for locking the position of the rack when the pressure of the gathering and transportation pipeline is within a specified pressure range; the opening driving mechanism is used for driving the output shaft to rotate in the forward direction so that the ball valve electric actuator can be opened. After the ball valve electric actuator is started, the starting driving mechanism is separated from the output shaft; when the pressure of the gathering and transportation pipeline exceeds the specified pressure range, the locking mechanism is unlocked, the rack is driven by the energy storage spring to move, and the first gear drives the output shaft to rotate reversely so that the ball valve electric actuator can be closed. The technical problem that in the prior art, a ball valve cannot be automatically closed when the pressure of a gathering pipeline exceeds the pressure range is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of oil and gas mining equipment, in particular to a ball valve electric actuator with a pressure protection function. Background Art

[0002] The wellhead of an oil and gas field usually has a higher pressure, while the pressure bearing capacity of the gathering and transportation pipeline is lower than that of the wellhead pipeline. During gas well production, when the surface pipeline is blocked or the downhole throttle fails, the pressure increases, which will cause overpressure in the surface pipeline. When the pipeline corrodes or is accidentally damaged and leaks, the wellhead pressure will decrease. Therefore, the gathering and transportation pipeline needs to be kept within a certain pressure range during production. However, the ball valve in the prior art only has a switching function and cannot automatically close when the pressure of the gathering and transportation pipeline exceeds the pressure range. Utility Model Content

[0003] The utility model aims to provide a ball valve electric actuator with a pressure protection function to solve the technical problem in the prior art that the ball valve cannot be automatically closed when the pressure of the gathering and transportation pipeline exceeds the pressure range.

[0004] The above-mentioned purpose of the utility model can be achieved by adopting the following technical solutions:

[0005] The utility model provides a ball valve electric actuator with a pressure protection function, comprising: a box body, an output shaft, an opening drive mechanism, a rack, an energy storage spring and a locking mechanism, wherein the output shaft is installed on the box body, and the output shaft can rotate relative to the box body to open or close the ball valve electric actuator; the output shaft is installed with a first gear;

[0006] The rack is movably mounted on the housing and meshes with the first gear; the energy storage spring is connected to the rack and is used to drive the rack to move relative to the housing; the locking mechanism is used to lock the position of the rack when the pressure of the gathering and transportation pipeline is within a specified pressure range;

[0007] The opening drive mechanism is connected to the output shaft, and is used to drive the output shaft to rotate in a positive direction so as to open the ball valve electric actuator; and after the ball valve electric actuator is opened, the opening drive mechanism is separated from the output shaft;

[0008] When the pressure of the gathering pipeline exceeds the specified pressure range, the locking mechanism is unlocked, the rack moves under the drive of the energy storage spring, and drives the output shaft to rotate in the opposite direction through the first gear to close the ball valve electric actuator.

[0009] In a preferred embodiment, the locking mechanism includes a movable pin and a limiting mechanism, and a limiting groove is provided on the rack, and the movable pin can move into the limiting groove; the limiting mechanism can be connected to the movable pin and can lock the movable pin in the limiting groove to lock the position of the rack.

[0010] In a preferred embodiment, the box body is provided with a locking seat, the rack passes through the box body and the locking seat, the locking seat is provided with a pin through hole, and the movable pin can be movably installed in the pin through hole; the end of the limiting groove has an inclined portion, and the movable pin can move from the limiting groove to the outside of the limiting groove along the inclined portion.

[0011] In a preferred embodiment, the limiting mechanism includes a first lever mechanism, a second lever mechanism, a locking spring and an unlocking drive mechanism, wherein the locking spring is connected to the second lever mechanism to keep the second lever mechanism in a locked position, and when the second lever mechanism is in the locked position, it can push the first lever mechanism to move toward the locking seat and press the movable pin into the limiting groove;

[0012] The unlocking drive mechanism is connected to the second lever mechanism and is used to rotate the second lever mechanism to an unlocking position. When the second lever mechanism is in the unlocking position, the first lever mechanism can rotate in a direction away from the rack to allow the movable pin to move in a direction pointing outside the limiting groove.

[0013] In a preferred embodiment, the unlocking drive mechanism includes an electric push rod and a pressure transmitter, wherein the pressure transmitter is used to detect the pressure of the gathering pipeline, and when the pressure of the gathering pipeline exceeds a specified pressure range, the electric push rod drives the second lever mechanism to rotate to the unlocking position.

[0014] In a preferred embodiment, the unlocking drive mechanism includes a single-acting cylinder, which is directly or indirectly connected to the gathering pipeline. When the pressure of the gathering pipeline exceeds a specified pressure range, the single-acting cylinder drives the second lever mechanism to rotate to the unlocking position.

[0015] In a preferred embodiment, the opening drive mechanism includes a motor and a second incomplete gear, wherein the second incomplete gear is directly or indirectly connected to the motor, and the second incomplete gear can mesh with the first gear and can rotate to separate from the first gear.

[0016] In a preferred embodiment, the rack and the second incomplete gear are respectively arranged on both sides of the first gear.

[0017] In a preferred embodiment, the opening drive mechanism includes a worm wheel, a worm and a clutch mechanism, the worm wheel is sleeved outside the output shaft, and the worm wheel can rotate relative to the output shaft, and the worm is connected to the worm wheel; the clutch mechanism can move to lock the worm wheel and the output shaft so that the two rotate synchronously.

[0018] In a preferred embodiment, the clutch mechanism includes a clutch spring, a clutch disc and a clutch handle, the clutch disc is mounted on the output shaft and can move axially along the output shaft, the clutch spring is connected to the clutch disc to drive the clutch disc to deviate from the worm gear; the clutch handle can drive the clutch disc to move until it is locked with the worm gear.

[0019] The characteristics and advantages of this utility model are:

[0020] During use, the drive mechanism is first opened to drive the output shaft to rotate in the forward direction to open the ball valve electric actuator; after the ball valve electric actuator is opened, since the rack is locked by the locking mechanism, the first gear and the output shaft are also locked, and the ball valve electric actuator remains in the open state; the opening drive mechanism is separated from the output shaft, so that the output shaft can move when the opening drive mechanism is not moving.

[0021] When the pressure of the gathering and transportation pipeline exceeds the specified pressure range, the locking mechanism is unlocked, the rack moves under the drive of the energy storage spring, and drives the output shaft to rotate in the opposite direction through the first gear, and the ball valve electric actuator is closed, so that when the pressure of the gathering and transportation pipeline exceeds the specified pressure range, the ball valve electric actuator can be automatically closed, and the pressure protection function is added, thereby ensuring the safe and reliable operation of the gathering and transportation pipeline and the components installed in the gathering and transportation pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0023] Figure 1 A front view of the ball valve electric actuator with pressure protection function provided by the utility model;

[0024] Figure 2 for Figure 1 Left view of

[0025] Figure 3 A front sectional view of the ball valve electric actuator with pressure protection function provided by the utility model;

[0026] Figure 4 for Figure 2 a cross-sectional view from above;

[0027] Figure 5 A schematic diagram of the assembly of a rack in a ball valve electric actuator with a pressure protection function provided by the utility model;

[0028] Figure 6 A partial cross-sectional view of the connection between a single-acting cylinder, a first cylinder rod mechanism and a second cylinder rod mechanism in the ball valve electric actuator with pressure protection function provided by the utility model;

[0029] Figure 7 A schematic diagram of the connection between the locking seat, the single-acting cylinder, the first cylinder rod mechanism and the second cylinder rod mechanism in the ball valve electric actuator with pressure protection function provided by the utility model;

[0030] Figure 8 A partial cross-sectional view of a locking seat, a single-acting cylinder, a first cylinder rod mechanism and a second cylinder rod mechanism in a locking position in the ball valve electric actuator with a pressure protection function provided by the utility model;

[0031] Fig. 9 A partial cross-sectional view of a locking seat, a single-acting cylinder, a first cylinder rod mechanism and a second cylinder rod mechanism in an unlocked position in the ball valve electric actuator with a pressure protection function provided by the utility model;

[0032] Fig.10 A partial cross-sectional view of the clutch handle of the ball valve electric actuator with pressure protection function provided by the utility model.

[0033] Description of Figure Numbers:

[0034] 1. Box body; 101. Pressure-introducing hole;

[0035] 2. Output shaft; 7. First gear;

[0036] 3. Worm gear; 4. Clutch spring; 5. Clutch plate; 19. Clutch handle; 191. Raised structure;

[0037] 20. Worm; 21. Hand wheel; 200. Open drive mechanism;

[0038] 6. rack; 61. limiting groove; 62. inclined portion;

[0039] 14. Locking seat; 141. Pin through hole; 22. Energy storage spring;

[0040] 8. Motor; 9. Gear No. 3; 10. Gear No. 4; 11. Incomplete gear No. 2;

[0041] 12. Motor stop position sensor; 13. Start position sensor;

[0042] 15. Locking mechanism; 150. Deviating from the direction of the rack;

[0043] 151, first lever mechanism; 1511, first fulcrum; 1512, first lever; 1513, hammer; 1514, groove;

[0044] 152, second lever mechanism; 1521, second fulcrum; 1522, second lever; 1523, locking spring;

[0045] 153. Movable pin;

[0046] 160. Unlocking drive mechanism;

[0047] 16. Electric push rod; 17. Pressure transmitter;

[0048] 18. Single-acting cylinder; 181. Cylinder spring. DETAILED DESCRIPTION

[0049] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0050] The utility model provides a ball valve electric actuator with pressure protection function, such as Figure 1-Figure 10 As shown, it includes: a box body 1, an output shaft 2, an opening drive mechanism 200, a rack 6, an energy storage spring 22 and a locking mechanism 15, the output shaft 2 is installed on the box body 1, and the output shaft 2 can rotate relative to the box body 1 to open or close the ball valve electric actuator; the output shaft 2 is installed with a first gear 7; the rack 6 is movably installed on the box body 1 and meshes with the first gear 7; the energy storage spring 22 is connected to the rack 6, and is used to drive the rack 6 to move relative to the box body 1; the locking mechanism 15 is used to lock the gear 6 when the pressure of the gathering pipeline is at a specified pressure The position of the rack 6 is locked when the gear is within the specified range; the opening drive mechanism 200 is connected to the output shaft 2, and the opening drive mechanism 200 is used to drive the output shaft 2 to rotate forward to open the ball valve electric actuator; and the opening drive mechanism 200 is separated from the output shaft 2 after the ball valve electric actuator is opened; when the pressure of the gathering pipeline exceeds the specified pressure range, the locking mechanism 15 is unlocked, and the rack 6 moves under the drive of the energy storage spring 22, and drives the output shaft 2 to rotate in the opposite direction through the first gear 7 to close the ball valve electric actuator.

[0051] During use, the drive mechanism 200 is first opened to drive the output shaft 2 to rotate in the forward direction to open the ball valve electric actuator; after the ball valve electric actuator is opened, since the rack 6 is locked by the locking mechanism 15, the first gear 7 and the output shaft 2 are also locked, and the ball valve electric actuator remains in the open state; the opening drive mechanism 200 is separated from the output shaft 2, so that the output shaft 2 can move when the opening drive mechanism 200 is not moving.

[0052] When the pressure of the gathering and transportation pipeline exceeds the specified pressure range, the locking mechanism 15 is unlocked, the rack 6 moves under the drive of the energy storage spring 22, and drives the output shaft 2 to rotate in the opposite direction through the first gear 7, and the ball valve electric actuator is closed, so that when the pressure of the gathering and transportation pipeline exceeds the specified pressure range, the ball valve electric actuator can be automatically closed, and the pressure protection function is added, thereby ensuring the safe and reliable operation of the gathering and transportation pipeline and the components installed in the gathering and transportation pipeline.

[0053] In one embodiment, if Figure 5 As shown, the locking mechanism 15 includes a movable pin 153 and a limiting mechanism. A limiting groove 61 is provided on the rack 6, and the movable pin 153 can move into the limiting groove 61; the limiting mechanism can be connected to the movable pin 153 and can lock the movable pin 153 in the limiting groove 61 to lock the position of the rack 6. Figure 5 and Fig. 9 As shown, the movable pin 153 is located outside the limiting groove 61, and specifically, the movable pin 153 abuts against the side wall of the rack 6 or is located outside the side wall of the rack 6. At this time, the rack 6 is not locked by the movable pin 153, and the rack 6 can move under the drive of the energy storage spring 22. Figure 8 As shown, the movable pin 153 is located in the limiting groove 61 and is restricted from moving out of the limiting groove 61 by the limiting mechanism, so that the rack 6 is locked by the movable pin 153 .

[0054] Furthermore, the box body 1 is provided with a locking seat 14, the rack 6 passes through the box body 1 and the locking seat 14, the locking seat 14 is provided with a pin through hole 141, and the movable pin 153 can be movably installed in the pin through hole 141; the end of the limiting groove 61 has an inclined portion 62, and the movable pin 153 can move from the inside of the limiting groove 61 to the outside of the limiting groove 61 along the inclined portion 62. Figure 5 and Figure 8-Figure 9As shown, the pin through hole 141 of the locking seat 14 can guide the movable pin 153. When the movable pin 153 is located in the limiting groove 61, but the limiting mechanism does not lock the movable pin 153, the rack 6 can move along its axial direction and make the movable pin 153 move relative to the rack 6 along the inclined portion 62 to the outside of the limiting groove 61, that is: when the limiting mechanism does not lock the movable pin 153, the rack 6 can move regardless of whether the movable pin 153 is located in the limiting groove 61 or outside the limiting groove 61.

[0055] Preferably, the rack 6 includes a rack portion and a cylindrical portion, the rack portion has rack teeth to mesh with the first gear 7, and the limiting groove 61 can be provided in the cylindrical portion, and the cylindrical portion cooperates with the through hole of the locking seat 14. Figure 5 As shown, the locking seat 14 and the energy storage spring 22 are distributed on both sides of the box body 1, and the energy storage spring 22 can be partially or completely arranged outside the box body 1 to reduce the size of the box body 1 and make the structure of the ball valve electric actuator more compact.

[0056] Furthermore, if Figure 6-Figure 9 As shown, the limiting mechanism includes a first lever mechanism 151, a second lever mechanism 152, a locking spring 1523 and an unlocking drive mechanism 160. The locking spring 1523 is connected to the second lever mechanism 152 to keep the second lever mechanism 152 in a locked position. When the second lever mechanism 152 is in the locked position, it can push the first lever mechanism 151 to move toward the locking seat 14 and press the movable pin 153 into the limiting groove 61; the unlocking drive mechanism 160 is connected to the second lever mechanism 152, and is used to rotate the second lever mechanism 152 to the unlocking position. When the second lever mechanism 152 is in the unlocking position, the first lever mechanism 151 can rotate in a direction 150 that deviates from the rack to allow the movable pin 153 to move out of the limiting groove 61.

[0057] like Figure 6-Figure 8 As shown, the second lever mechanism 152 is in the locking position, the second lever mechanism 152 abuts against the first lever mechanism 151, and pushes the movable pin 153 to move inward along the pin through hole 141 to press the movable pin 153 so that the movable pin 153 can be locked in the limiting groove 61.

[0058] like Fig. 9 As shown, the second lever mechanism 152 is in the unlocked position, and the second lever mechanism 152 moves in a direction deviating from the first lever mechanism 151, so that the first lever mechanism 151 can move. At this time, the resistance of the first lever mechanism 151 to the movable pin 153 is reduced or the first lever mechanism 151 deviates from the movable pin 153, and the movable pin 153 can move outward along the pin through hole 141 to move outside the limiting groove 61, and the rack 6 is unlocked.

[0059] Specifically, the first lever mechanism 151 includes a first lever 1512 and a first fulcrum 1511; the second lever mechanism 152 includes a second lever 1522 and a second fulcrum 1521, the first end of the first lever 1512 has a groove 1514, the second end of the first lever 1512 is connected to a hammer 1513, the hammer 1513 is used to abut against the movable pin 153, the locking spring 1523 is connected to the second lever 1522 and keeps the second lever 1522 in the locked position, at this time, the second lever 1522 abuts against the first lever 1512 and deviates from the groove 1514, pushing the hammer 1513 to Figure 8 The lower part of the first lever 1512 moves to compress the movable pin 153, and the rack 6 is locked. When unlocking is required, the unlocking drive mechanism 160 offsets the elastic force of the locking spring 1523, drives the second lever 1522 to deflect and cooperate with the groove 1514, so that the hammer 1513 on the first lever 1512 can move to the lower part of the first lever 1512. Figure 8 The upward movement shown in the figure allows the movable pin 153 to also move Figure 8 The upward movement shown, that is, the movable pin 153 leaves the limiting groove 61, and the rack 6 is unlocked.

[0060] In one embodiment, the unlocking drive mechanism 160 includes an electric push rod 16 and a pressure transmitter 17. The pressure transmitter 17 is used to detect the pressure of the gathering pipeline. When the pressure of the gathering pipeline exceeds a specified pressure range, the electric push rod 16 drives the second lever mechanism 152 to rotate to the unlocking position. Figure 1 As shown, the movable push rod of the electric push rod 16 can abut against the second lever 1522; the pressure transmitter 17 and the electric push rod 16 are both electrically connected to the intelligent control system. When the pressure exceeds the pressure protection range and the pressure transmitter 17 detects overpressure, the intelligent control system automatically sends a closing command, and the movable push rod of the electric push rod 16 extends out, pushing the second lever 1522 to swing to the unlocked position, so that the rack 6 is unlocked, and can drive the output shaft 2 to rotate in the opposite direction under the action of the energy storage spring 22, so that the ball valve electric actuator is closed.

[0061] The box body 1 is provided with a pressure-introducing hole 101. When installed and used, the pressure-introducing hole 101 can introduce medium pressure from the ball valve electric actuator or the gathering pipeline. The pressure transmitter 17 is directly or indirectly connected to the pressure-introducing hole 101, so that the pressure transmitter 17 can detect the pressure of the gathering pipeline and realize the pressure protection function.

[0062] Specifically, when the pressure transmitter 17 detects that the pressure of the gathering and transportation pipeline is higher than the specified pressure range, the electric push rod 16 drives the second lever mechanism 152 to rotate to the unlocked position; and / or, when the pressure transmitter 17 detects that the pressure of the gathering and transportation pipeline is lower than the specified pressure range, the electric push rod 16 drives the second lever mechanism 152 to rotate to the unlocked position. For example, in a certain oil field, the natural gas transmission pipeline of the well site can withstand a maximum pressure of 6MPa. Generally, the pressure of the gathering and transportation pipeline is set higher than 5MPa, and the ball valve electric actuator is automatically closed; when the pressure is lower than 0.5MPa, it is considered that the production capacity is insufficient or the transmission pipeline has been seriously ruptured, and the ball valve electric actuator also automatically closes the valve. That is, the specified pressure is a range value, and the valve is automatically closed when it is higher than 5MPa or lower than 0.5MPa, ensuring safe production of the transmission pipeline within the pressure range between 5MPa and 0.5MPa.

[0063] In one embodiment, if Figure 1 and Figure 6-Figure 9 As shown, the unlocking drive mechanism 160 includes a single-acting cylinder 18, which is directly or indirectly connected to the gathering pipeline. When the pressure of the gathering pipeline exceeds the specified pressure range, the single-acting cylinder 18 drives the second lever mechanism 152 to rotate to the unlocking position. The single-acting cylinder 18 can be connected to the gathering pipeline through the pressure-inducing hole 101. After the pressure of the gathering pipeline exceeds the specified pressure range, the medium in the gathering pipeline can drive the piston rod of the single-acting cylinder 18 to move, and the piston rod drives the second lever 1522 to swing, so that the second lever mechanism 152 rotates to the unlocking position. Specifically, when the pressure of the gathering pipeline is higher than the specified pressure range, the single-acting cylinder 18 drives the second lever mechanism 152 to rotate to the unlocking position; and / or, when the pressure of the gathering pipeline is lower than the specified pressure range, the single-acting cylinder 18 drives the second lever mechanism 152 to rotate to the unlocking position.

[0064] Preferably, if Figure 1 As shown, the unlocking drive mechanism 160 includes an electric push rod 16, a pressure transmitter 17 and a single-acting cylinder 18. When the pressure exceeds the pressure protection range, the pressure transmitter 17 detects the overpressure, and the intelligent control system automatically sends a closing command, the electric push rod 16 is actuated, and the electric push rod 16 drives the second lever mechanism 152 to rotate to the unlocking position, the rack 6 is unlocked and drives the output shaft 2 to rotate in the opposite direction to close the ball valve electric actuator, and the control is more precise; while the electric push rod 16 drives the second lever mechanism 152 to rotate, the piston rod of the single-acting cylinder 18 also moves accordingly.

[0065] When the pressure exceeds the pressure protection range and the intelligent control system fails for various reasons, the piston rod of the single-acting cylinder 18 drives the second lever 1522 to swing, causing the second lever mechanism 152 to rotate to the unlocked position, and the rack 6 is unlocked and drives the output shaft 2 to rotate in the opposite direction to close the ball valve electric actuator, thereby improving the reliability of control.

[0066] like Figure 6 As shown, the single-acting cylinder 18 includes a cylinder spring 181. After overpressure, the medium in the gathering pipeline can offset the elastic force of the cylinder spring 181 and drive the piston rod of the single-acting cylinder 18 to move, and the piston rod drives the second lever 1522 to swing.

[0067] In one embodiment, the opening drive mechanism 200 includes a motor 8 and a second incomplete gear 11 , which is directly or indirectly connected to the motor 8 , and can mesh with the first gear 7 and rotate to separate from the first gear 7 .

[0068] In the initial state, the second incomplete gear 11 is meshed with the first gear 7. When the motor 8 drives the second incomplete gear 11 to rotate, the first gear 7 and the output shaft 2 are driven to rotate simultaneously, so that the ball valve electric actuator is opened.

[0069] After the ball valve electric actuator is opened, the second incomplete gear 11 rotates to separate from the first gear 7. At this time, the first gear 7 and the second incomplete gear 11 will not rotate together, so that the first gear 7 and the output shaft 2 can rotate under the drive of the rack 6. Since the second incomplete gear 11 will not rotate, the resistance to the rotation of the output shaft 2 is reduced, so that the ball valve electric actuator is convenient to close under the force provided by the energy storage spring 22.

[0070] Specifically, the second incomplete gear 11 includes a gear portion and a non-toothed portion, the gear portion has gear teeth for meshing with the first gear 7, the non-toothed portion is not provided with gear teeth, and the non-toothed portion can be a cylindrical surface, when the second incomplete gear 11 rotates until the non-toothed portion is close to the first gear 7 and the gear portion is away from the first gear 7, the second incomplete gear 11 is separated from the first gear 7. Preferably, the transmission ratio between the gear portion and the first gear 7 is 1:1.

[0071] When the second incomplete gear 11 drives the first gear 7 and the output shaft 2 to rotate forward, the rack 6 is meshed with the first gear 7, the rack 6 moves, and the energy storage spring 22 stores energy; the rack 6 moves into place, the locking mechanism 15 locks the rack 6, and the ball valve electric actuator remains open. When the ball valve electric actuator needs to be closed (outside the specified pressure range or actively closed), the locking mechanism 15 is unlocked, and the energy storage spring 22 drives the rack 6 to move, so that the ball valve electric actuator is closed.

[0072] Furthermore, if Figure 3As shown, the rack 6 and the second incomplete gear 11 are respectively arranged on both sides of the first gear 7, so that the structure of the rack 6, the opening drive mechanism 200 and the output shaft 2 is more compact, which is convenient for realizing the positive rotation of the output shaft 2 while storing energy in the energy storage spring 22.

[0073] Preferably, the second incomplete gear 11 is indirectly connected to the motor 8, specifically, as Figure 1 As shown, the motor 8 is connected to the second incomplete gear 11 through the third gear 9, the fourth gear 10 and the transmission shaft, and the fourth gear 10 and the second incomplete gear 11 are installed on the same transmission shaft.

[0074] In one embodiment, if Figure 3 and Figure 4 As shown, the opening drive mechanism 200 includes a worm wheel 3, a worm 20 and a clutch mechanism. The worm wheel 3 is sleeved outside the output shaft 2, and the worm wheel 3 can rotate relative to the output shaft 2. The worm 20 is connected to the worm wheel 3; the clutch mechanism can move to lock the worm wheel 3 and the output shaft 2 so that the two rotate synchronously. When the clutch mechanism is in a separated state, the worm wheel 3 and the output shaft 2 will not rotate together. Therefore, when the worm 20 is manually driven and the worm wheel 3 is driven to rotate, the output shaft 2 will not rotate with it; when the clutch mechanism is in a locked state, the output shaft 2 and the worm wheel 3 are locked and the two rotate together. Therefore, when the worm 20 is manually driven and the worm wheel 3 is driven to rotate, the output shaft 2 will rotate with the worm wheel 3 to realize manual operation of the ball valve electric actuator to open. Preferably, the worm 20 is connected with a hand wheel 21 to facilitate manual operation by the operator.

[0075] Furthermore, the clutch mechanism includes a clutch spring 4, a clutch disc 5 and a clutch handle 19. The clutch disc 5 is mounted on the output shaft 2 and can move axially along the output shaft 2. The clutch spring 4 is connected to the clutch disc 5 to drive the clutch disc 5 to deviate from the worm gear 3. The clutch handle 19 can drive the clutch disc 5 to move to lock with the worm gear 3. When the clutch handle 19 is not operated, the clutch disc 5 deviates from the worm gear 3 under the action of the clutch spring 4, and the worm gear 3 can rotate relative to the output shaft 2. By operating the clutch handle 19, the clutch disc 5 is driven to move along the output shaft 2. Figure 3 The downward movement shown in the figure locks the clutch disc 5 and the worm gear 3. At this time, the operator drives the worm gear 3 to rotate, and the clutch disc 5 and the output shaft 2 rotate together.

[0076] Specifically, the end faces of the clutch disc 5 and the worm wheel 3 may be provided with matching teeth, so that when the two are close to or in contact, locking is achieved through the matching teeth, so that they rotate together. The worm wheel 3 is connected to the output shaft 2 via a bearing; the clutch disc 5 is slidably connected to the output shaft 2, and the clutch disc 5 can move along the axial direction of the output shaft 2, but cannot rotate relative to each other, that is, the clutch disc 5 and the output shaft 2 are limited to rotate together. In one embodiment, the clutch handle 19 is connected to the protruding structure 191, and the clutch handle 19 is operated to drive the protruding structure 191 to rotate, so that the protruding structure 191 rotates until it abuts against the clutch disc 5, and the protruding structure 191 pushes the clutch disc 5 along the Figure 3 The downward movement shown causes the clutch disc 5 to be locked with the worm gear 3. The protruding structure 191 may be a cam, a bump or other structures.

[0077] Furthermore, the opening drive mechanism 200 includes a worm wheel 3, a worm 20, a clutch mechanism, a motor 8 and a second incomplete gear 11. The ball valve electric actuator can realize electric intelligent control and manual operation. When the electric intelligent control fails, manual operation can be performed manually.

[0078] In order to ensure that the second incomplete gear 11 and the first gear 7 can be accurately engaged each time, when installing the ball valve electric actuator, first assemble the housing 1, the locking seat 14, the rack 6, and the energy storage spring 22; then install the worm 20, the first gear 7, the clutch plate 5, the clutch spring 4, the worm wheel 3, and the output shaft 2; then install the second incomplete gear 11. During the assembly of the second incomplete gear 11, the first tooth of the gear part of the second incomplete gear 11 in the opening direction must be engaged with the first gear 7, and ensure that the second incomplete gear 11 and the first gear 7 can be accurately engaged; the subsequent installation is carried out in order from the inside to the outside.

[0079] In the electric intelligent control mode, the working steps of the ball valve electric actuator include:

[0080] (1) The motor 8 is powered on, and drives the third gear 9, the fourth gear 10, the second incomplete gear 11, and the first gear 7 in sequence. The first gear 7 drives the output shaft 2 to rotate 90°, and the ball valve electric actuator is turned on. At this time, the second incomplete gear 11 and the first gear 7 are disengaged. When the intelligent control system detects the signal of the motor stop position sensor 12, the motor 8 stops running, and the second incomplete gear 11 and the first gear 7 are ensured to be separated. In addition, the first gear 7 drives the rack 6 to move. When the ball valve electric actuator is turned on, the locking mechanism 15 locks the rack 6 at the current position. The ball valve electric actuator remains in the open state, and the open position sensor 13 can be used to detect whether the output shaft 2 is in the open state.

[0081] (2) When the ball valve electric actuator needs to be closed (the pressure collected by the pressure transmitter 17 exceeds the pressure protection range, or it is actively closed), the electric intelligent control system sends a command, the electric push rod 16 moves to push the locking mechanism 15 to unlock, and the energy storage spring 22 drives the rack 6 to move in the opposite direction, driving the first gear 7 and the output shaft 2 to rotate 90°, and the ball valve electric actuator is closed.

[0082] In the intelligent control mode, the worm gear 3, the worm 20, the handwheel 21 and the output shaft 2 are separated from each other, and the worm gear 3, the worm 20 and the handwheel 21 do not rotate with the output shaft 2; when the intelligent control mode cannot operate normally, the manual operation mode is required. In the manual operation mode, the working steps of the ball valve electric actuator include:

[0083] (1) First, gently pull the clutch handle 19, which drives the clutch disc 5 to press the clutch spring 4 downward, so that the clutch disc 5 and the worm gear 3 are engaged, and the hand wheel 21 is rotated counterclockwise, and the ball valve electric actuator will perform the opening action. After the ball valve electric actuator is opened, the rack 6 is locked by the locking mechanism 15, and the clutch handle 19 is released. The clutch disc 5 is separated from the worm gear 3 under the action of the clutch spring 4, and the transmission system composed of the worm gear 3 and the worm 20 is separated from the output shaft 2, reducing the resistance of the subsequent energy storage spring 22 during closing.

[0084] (2) When the electric actuator of the ball valve needs to be actively closed, the balance of the locking mechanism 15 can be artificially destroyed, and the actuator can be closed under the action of the energy storage spring 22.

[0085] (3) When the pressure exceeds the specified range, the single-acting cylinder 18 automatically closes the valve. The medium pressure is introduced into the single-acting cylinder 18 through the pressure-introducing hole 101. The cylinder spring 181 in the single-acting cylinder 18 senses the medium pressure. When the medium pressure exceeds the specified range (either high or low), the cylinder spring 181 drives the piston rod in the single-acting cylinder 18 to destroy the balance of the locking mechanism 15. The energy storage spring 22 drives the rack 6 to move in the opposite direction, driving the first gear 7 and the output shaft 2 to rotate 90°, and the ball valve electric actuator is closed.

[0086] The ball valve provided by the utility model can be installed on the gathering and transportation pipeline, and has a pressure protection function, which ensures that the gathering and transportation pipeline is produced within the specified pressure range. When the pressure exceeds this pressure range, the electric actuator of the ball valve is automatically closed to meet the production conditions of the oil and gas well. The ball valve provided by the utility model can also be applied to other pipelines.

[0087] The above are only several embodiments of the present invention. Those skilled in the art can make various changes or modifications to the embodiments of the present invention based on the contents disclosed in the application documents without departing from the spirit and scope of the present invention.

Claims

1. A ball valve electric actuator with pressure protection function, characterized in that: include: A housing, an output shaft, an opening drive mechanism, a rack, an energy storage spring and a locking mechanism, wherein the output shaft is mounted on the housing, and the output shaft can rotate relative to the housing to open or close the ball valve electric actuator; the output shaft is mounted with a first gear; The rack is movably mounted on the housing and meshes with the first gear; the energy storage spring is connected to the rack and is used to drive the rack to move relative to the housing; the locking mechanism is used to lock the position of the rack when the pressure of the gathering and transportation pipeline is within a specified pressure range; The opening drive mechanism is connected to the output shaft, and is used to drive the output shaft to rotate in a positive direction so as to open the ball valve electric actuator; and after the ball valve electric actuator is opened, the opening drive mechanism is separated from the output shaft; When the pressure of the gathering pipeline exceeds the specified pressure range, the locking mechanism is unlocked, the rack moves under the drive of the energy storage spring, and drives the output shaft to rotate in the opposite direction through the first gear to close the ball valve electric actuator.

2. The ball valve electric actuator with pressure protection function according to claim 1 is characterized in that: The locking mechanism includes a movable pin and a limiting mechanism. A limiting groove is provided on the rack, and the movable pin can move into the limiting groove; the limiting mechanism can be connected to the movable pin and can lock the movable pin in the limiting groove to lock the position of the rack.

3. The ball valve electric actuator with pressure protection function according to claim 2 is characterized in that: The box body is provided with a locking seat, the rack passes through the box body and the locking seat, the locking seat is provided with a pin through hole, and the movable pin can be movably installed in the pin through hole; The end of the limiting groove has an inclined portion, and the movable pin can move from the limiting groove to the outside of the limiting groove along the inclined portion.

4. The ball valve electric actuator with pressure protection function according to claim 3 is characterized in that: The limiting mechanism includes a first lever mechanism, a second lever mechanism, a locking spring and an unlocking drive mechanism. The locking spring is connected to the second lever mechanism to keep the second lever mechanism in a locked position. When the second lever mechanism is in the locked position, it can push the first lever mechanism to move toward the locking seat and press the movable pin into the limiting groove; The unlocking drive mechanism is connected to the second lever mechanism and is used to rotate the second lever mechanism to an unlocking position. When the second lever mechanism is in the unlocking position, the first lever mechanism can rotate in a direction away from the rack to allow the movable pin to move in a direction pointing outside the limiting groove.

5. The ball valve electric actuator with pressure protection function according to claim 4 is characterized in that: The unlocking drive mechanism includes an electric push rod and a pressure transmitter. The pressure transmitter is used to detect the pressure of the gathering pipeline. When the pressure of the gathering pipeline exceeds a specified pressure range, the electric push rod drives the second lever mechanism to rotate to the unlocking position.

6. The ball valve electric actuator with pressure protection function according to claim 4 or 5, characterized in that: The unlocking drive mechanism includes a single-acting cylinder, which is directly or indirectly connected to the gathering pipeline. When the pressure of the gathering pipeline exceeds a specified pressure range, the single-acting cylinder drives the second lever mechanism to rotate to an unlocking position.

7. The ball valve electric actuator with pressure protection function according to claim 1, characterized in that: The opening drive mechanism comprises a motor and a second incomplete gear, wherein the second incomplete gear is directly or indirectly connected to the motor. The second partial gear can mesh with the first gear and can rotate to be separated from the first gear.

8. The ball valve electric actuator with pressure protection function according to claim 7, characterized in that: The rack and the second incomplete gear are respectively arranged on both sides of the first gear.

9. The ball valve electric actuator with pressure protection function according to claim 1 or 7, characterized in that: The opening drive mechanism comprises a worm wheel, a worm and a clutch mechanism, wherein the worm wheel is sleeved outside the output shaft and the worm wheel can rotate relative to the output shaft, and the worm is connected to the worm wheel; The clutch mechanism can be moved to lock the worm gear and the output shaft so that the two rotate synchronously.

10. The ball valve electric actuator with pressure protection function according to claim 9, characterized in that: The clutch mechanism includes a clutch spring, a clutch disc and a clutch handle. The clutch disc is mounted on the output shaft and can move axially along the output shaft, and the clutch spring is connected to the clutch disc to drive the clutch disc to deviate from the worm gear; The clutch handle can drive the clutch disc to move and lock with the worm gear.

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