An actuator for an emergency shut-off valve

Abstract

The present invention provides an actuator for an emergency shut-off valve, which belongs to the technical field of emergency shut-off valves and includes a housing. A hollow shaft is rotatably connected between the two vertical plates of the housing, and one end of the hollow shaft is fixedly connected to the valve shaft of the ball valve. The hollow shaft passes through a lever beam and is fixedly connected to the lever beam. The spring base of the energy storage spring of the mechanical control box for the emergency shut-off valve is connected to an actuator shaft, and the lower end of the actuator shaft abuts against one end of the lever beam. A push rod is provided in the housing for upward and downward movement, and the push rod is driven by a screw transmission assembly, and the lower end of the push rod abuts against the other end of the lever beam. A manual drive assembly is rotatably provided on the outside of the housing, and the manual drive assembly drives the screw transmission assembly to rotate via a bevel gear transmission assembly. An electric drive assembly is fixed on the outside of the housing, and the output end of the electric drive assembly is transmitted to the bevel gear transmission assembly via a gear transmission assembly. The actuator has a short mechanical transmission link and adopts a ball screw with high transmission efficiency, which has high efficiency and low energy consumption.

Description

Technical Field

[0001] The present invention relates to the technical field of emergency shut-off valves, and in particular to an actuator for an emergency shut-off valve. Background Art

[0002] The emergency shut-off valve uses an actuator to connect the valve and the mechanical control box, and works with the mechanical control box to complete manual valve opening, electric valve opening instructions and valve closing actions; and feeds back the valve status signal to the electrical control box; the actuator is an important component of the emergency shut-off valve.

[0003] The common actuators used for emergency shut-off valves currently have a basic transmission chain: a motor connected to a reducer; the reducer meshes with a multi-stage gear, further reducing the speed to increase the output torque; the last-stage gear is connected to the ball valve shaft, and the rotation of the gear drives the ball of the ball valve to rotate, thereby opening the valve; when closing the valve, the energy storage spring in the mechanical control box acts on the rack, which meshes with the last-stage gear. The elastic force of the spring pushes the gear to rotate, driving the ball of the ball valve to rotate, thereby closing the valve. The manual valve opening process is as follows: a handle is provided on the shaft of the last-stage gear. Manually rotating the handle turns the gear, driving the ball of the ball valve to rotate, thereby opening the valve;

[0004] The aforementioned traditional actuator for emergency shut-off valves has the following three drawbacks. First, the actuator's transmission system, from the motor to the reducer and then to the final gear stage, involves numerous stages, resulting in low transmission efficiency and high energy consumption. Second, when closing the valve, the rack moves rapidly under the force of the spring, rapidly rotating the gears. This gear must withstand significant impact, making it prone to tooth breakage and failure, resulting in poor reliability. Third, when manually opening the valve, the handle must be manually rotated to drive the final gear stage, which connects the rack to the valve shaft. The rack is under spring pressure, and the valve shaft is connected to the ball. Manually opening the valve requires overcoming both the friction of the valve ball and the compression spring. Consequently, manual valve opening requires significant torque, making it inconvenient. Summary of the Invention

[0005] To solve the above problems, the present invention provides an actuator for an emergency shut-off valve. The actuator has a short mechanical transmission link and adopts a ball screw with high transmission efficiency, thereby achieving high efficiency and low energy consumption.

[0006] To achieve the above objectives, the present invention provides the following technical solutions.

[0007] An actuator for an emergency shut-off valve, comprising:

[0008] Box;

[0009] A hollow shaft connected to the valve shaft of the ball valve, with both ends thereof being rotatably connected between the two vertical plates of the box body;

[0010] Lever beam; the hollow shaft passes through the lever beam and is fixedly connected to the lever beam;

[0011] Two sets of limit pins are fixedly arranged on the vertical plate of the box body to limit the rotation angle of the lever beam so that the allowed rotation angle of the lever beam matches the switch position of the ball valve;

[0012] An actuator shaft, the upper end of which is in contact with the spring base of the energy storage spring of the mechanical control box for the emergency shut-off valve, and the lower end of which passes through the top of the box and abuts against one end of the lever beam;

[0013] A push rod is driven by a screw transmission assembly to move up and down in the box; the lower end of the push rod abuts against the other end of the lever beam;

[0014] A manual drive assembly is rotatably arranged outside the box body and drives the screw drive assembly to rotate through the bevel gear drive assembly;

[0015] The electric drive assembly is fixedly mounted on the outside of the box; the output end of the electric drive assembly is transmitted to the bevel gear transmission assembly through the gear transmission assembly.

[0016] Preferably, the box body is composed of an upper cover, a guard plate, a mounting plate, a left side plate, a main plate, a right side plate and a bottom plate to form a closed box body; the mounting plate and the guard plate constitute one of the vertical plates; the two ends of the hollow shaft are rotatably connected to the mounting plate and the main plate through the first bearing seat and the second bearing seat respectively.

[0017] Preferably, a position sensor is further included, and an input end thereof cooperates with one end of the hollow shaft.

[0018] Preferably, it also includes:

[0019] A first pin shaft and a second pin shaft pass through both ends of the lever beam and are fixedly connected to the lever beam;

[0020] The first sleeve and the second sleeve are rotatably connected to one end of the first pin and the second pin respectively; the lower end of the push rod is fixedly provided with a first T-block, and the lower end of the actuator shaft is fixedly provided with a second T-block;

[0021] The tops of the first sleeve and the second sleeve respectively interfere with the bottoms of the first T-block and the second T-block.

[0022] Preferably, the two groups of limit pins include a first limit pin and a second limit pin; the first limit pin and the second limit pin are both fixedly arranged on the main board; when the lever beam rotates to a certain angle, the other ends of the first pin shaft and the second pin shaft respectively abut against the first limit pin and the second limit pin, and the movement is restricted.

[0023] Preferably, the screw transmission assembly comprises:

[0024] A ball nut, fixedly arranged on the top end of the push rod;

[0025] The third bearing seat is fixedly arranged on the main board; the push rod is provided with a square groove, and the inner wall of the square groove abuts against two sides of the third bearing seat;

[0026] The ball screw passes through the ball nut and the push rod in sequence and cooperates with the ball nut thread; one end of the ball screw is rotatably connected to the upper cover, and the other end is fixed in the third bearing seat.

[0027] Preferably, the bevel gear transmission assembly comprises:

[0028] a first bevel gear fixedly disposed on the upper end of the ball screw;

[0029] The bevel gear shaft is rotatably mounted on the main board via the first bearing seat component;

[0030] The second bevel gear is fixedly arranged on the bevel gear shaft and meshes with the first bevel gear.

[0031] Preferably, the manual drive assembly comprises:

[0032] Spring; the bevel gear shaft is a square shaft, and the spring is fixedly arranged on the bevel gear shaft;

[0033] a first linear bearing, fixedly disposed in the first bearing seat component;

[0034] A manual shaft, one end of which is fixedly arranged in the first linear bearing; one end of the manual shaft is provided with a square hole matching the square shaft of the bevel gear shaft;

[0035] A handle is fixedly arranged at the other end of the manual shaft.

[0036] Preferably, the electric drive assembly is a motor; the gear transmission assembly includes:

[0037] a spur gear fixedly arranged on the bevel gear shaft;

[0038] A second bearing seat component is fixedly arranged on the main board;

[0039] A large gear is rotatably mounted on the second bearing seat component via a spur gear shaft; the large gear is meshed with the spur gear;

[0040] The helical gear shaft is rotatably mounted on the main board through the third bearing seat component;

[0041] A helical gear is fixedly arranged on the helical gear shaft; the output shaft of the motor is fixed with a motor helical gear; the motor helical gear is meshed with the helical gear;

[0042] The small gear is fixedly arranged on the helical gear shaft; the small gear is meshed with the large gear.

[0043] Preferably, the actuator shaft is mounted on the upper cover via a second linear bearing.

[0044] Beneficial effects of the present invention:

[0045] This invention proposes an actuator for an emergency shutoff valve. This new actuator features a short mechanical transmission chain and utilizes a high-efficiency ball screw, resulting in high efficiency and low energy consumption. This actuator has no vulnerable components under high impact forces, resulting in high reliability. The manual operating handle of this new actuator lacks a final gear stage, and the ball screw converts torque into thrust to drive the valve and compress the spring, making operation easy and convenient. A rear position sensor provides real-time feedback on the valve status, demonstrating its high level of intelligence. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 This is an overall assembly structure diagram of an actuator for an emergency shut-off valve of the present invention;

[0047] Figure 2 This is another angled overall assembly structure diagram of an actuator for an emergency shut-off valve of the present invention;

[0048] Figure 3 This is a schematic diagram of the overall internal structure of an actuator for an emergency shut-off valve of the present invention;

[0049] Figure 4 This is a front view of the overall internal structure of an actuator for an emergency shut-off valve of the present invention;

[0050] Figure 5 This is a side view of the internal structure of an actuator for an emergency shut-off valve of the present invention;

[0051] Figure 6 It is a partial structural diagram of a manual drive assembly of an actuator for an emergency shut-off valve of the present invention.

[0052] Among them: 1. Actuator shaft; 2. Upper cover; 3. Guard plate; 4. Mounting plate; 5. Position sensor; 6. Handle; 7. Manual shaft; 8. First linear bearing; 9. Motor; 10. Left side plate; 11. Main plate; 12. Right side plate; 13. Bottom plate; 14. Ball nut; 15. Push rod; 16. Ball screw; 17. Third bearing seat; 18. First T-block; 19. First bearing seat; 20. Second linear bearing; 21. Spur gear shaft; 22. Motor helical gear; 23. Spur gear; 24. A bevel gear; 25. A second bevel gear; 26. A first limiting pin; 27. A first bushing; 28. A first pin shaft; 29. ​​A lever beam; 30. A hollow shaft; 31. A second pin shaft; 32. A large gear; 33. A helical gear; 34. A small gear; 35. A second limiting pin; 36. A second bearing seat; 37. A second T-block; 38. A second bushing; 39. A helical gear shaft; 40. A second bearing seat component; 41. A third bearing seat component; 42. A first bearing seat component; 43. A bevel gear shaft; 44. A spring. DETAILED DESCRIPTION

[0053] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0054] Example 1

[0055] An actuator for an emergency shut-off valve, the overall structure of which is as follows Figure 1 As shown, the specific structure of the mechanical control box for the emergency shut-off valve can be found in the patent applied for on the same day: A mechanical control box for an emergency shut-off valve, and the specific structure of the trigger mechanism for the emergency shut-off valve can be found in the utility model patent CN202123246968.7 A trigger mechanism for an emergency shut-off valve.

[0056] Reference Figure 1 and Figure 2 The main gears and transmission components of an emergency shut-off valve actuator are arranged in a fixed enclosed space composed of an upper cover 2, a guard plate 3, a mounting plate 4, a left side plate 10, a main plate 11, a right side plate 12 and a bottom plate 13 connected to each other by bolts.

[0057] Reference Figure 3 and Figure 4, a second bearing seat 36 is fixed on the main board 11; a first bearing seat 19 is fixed on the mounting plate 4; a hollow shaft 30 is installed between the first bearing seat 19 and the second bearing seat 36, and the inner hole and outer circle of the hollow shaft 30 are machined with keyways; the outer circle of the hollow shaft 30 is fixedly connected to the lever beam 29 through a key, and the inner hole is connected to the valve shaft; the first pin 28 and the second pin 31 are respectively provided at both ends of the lever beam 29; the first shaft sleeve 27 and the second shaft sleeve 38 are respectively installed on the first shaft sleeve 28 and the second shaft sleeve 31; the main board 1 1 is welded with a first limit pin 26 and a second limit pin 35; the hollow shaft 30 and the lever beam 29 can rotate together; the first shaft sleeve 27 can rotate on the first pin 28; the second shaft sleeve 38 can rotate on the second pin 31; when the lever beam 29 rotates, the first pin 28 and the second pin 31 fixed on the lever beam will touch the first limit pin 26 and the second limit pin 35 welded on the main board 11, and the movement is restricted, and can only rotate 90°, matching the on / off position of the ball valve.

[0058] Reference Figure 3 and Figure 4 , a fixing hole is processed on the upper cover 2; the third bearing seat 17 is fixed to the main board 11; one end of the ball screw 16 is fixed in the third bearing seat 17, and the other end is fixed in the hole of the upper cover 2; the ball screw 16 can rotate but cannot move up and down; a ball nut 14 is engaged with the ball screw 16, and a push rod 15 is fixed on the ball nut 14; a square hole is processed on the push rod 15, and the two inner walls of the square hole are in tangential contact with the two side edges of the third bearing seat 17; the upper end of the ball screw 16 is fixed A first bevel gear 24 is fixedly connected to the main board 11, and the first bevel gear 24 is meshed with the second bevel gear 25; a first bearing seat component 42 is fixedly connected to the main board 11, and a bevel gear shaft 43 is provided on the first bearing seat component 42; the second bevel gear 25 and the spur gear 23 are fixedly connected to the bevel gear shaft 43, and the two gears rotate synchronously; a second bearing seat component 40 is fixed to the main board 11, and a large gear 32 is connected to the shaft of the second bearing seat component 40; the large gear 32 is meshed with the spur gear 23.

[0059] The third bearing seat component 41 is fixed to the main board 11. A helical gear shaft 39 is mounted on the third bearing seat component 41. The helical gear 33 and the pinion gear 34 are fixedly connected to the helical gear shaft 39. The pinion gear 34 meshes with the large gear 32. The motor 9 is fixed to the main board 11. The motor helical gear 22 is fixed to the output shaft of the motor 9. The motor helical gear 22 meshes with the helical gear 33.

[0060] Reference Figure 4A second linear bearing 20 is fixed on the upper cover 2, and the executive shaft 1 is installed on the second linear bearing 20. Constrained by the second linear bearing 20, the executive shaft 1 can only move up and down; the lower end of the executive shaft 1 is connected to the second T-shaped block 37; the upper end of the executive shaft 1 is connected to the energy storage spring base of the mechanical control box, and the spring base is always tightly connected to the executive shaft 1 under the pressure of the energy storage spring; the pressure of the energy storage spring is transmitted to the executive shaft 1 and the second T-shaped block 37 through the energy storage spring base in turn. Under the action of the spring force, the second T-shaped block 37 is always in contact with the second sleeve 38.

[0061] Reference Figure 5 and Figure 6 A first bearing seat component 42 is fixed to the mainboard 11, and a first linear bearing 8 is fixedly connected to the first bearing seat component 42; a manual shaft 7 is installed inside the first linear bearing 8, and a handle 6 is fixedly installed at the end of the manual shaft 7; a square hole is machined at the other end of the handwheel shaft 7; the end of the bevel gear shaft 43 is a square shaft, and a spring 44 is installed on the bevel gear shaft 43; the square shaft machined on the bevel gear shaft 43 matches the square hole of the manual shaft 7 in size; the bevel gear shaft 43 and the manual shaft 7 are disengaged under the elastic force of the spring 44; during manual operation, external force is required to overcome the elastic force of the spring 44, so that the square shaft at the end of the bevel gear shaft 43 is inserted into the square hole of the manual shaft 7, and torque can be transmitted between the two. After the external force is eliminated, the manual shaft 7 and the bevel gear shaft 43 are disengaged under the elastic force of the spring 44.

[0062] In this embodiment, when the actuator electrically opens the valve, the motor 9 drives the helical gear shaft 22 to rotate, which in turn drives the helical gear 33 to rotate. The helical gear 33 and the pinion gear 34 rotate synchronously. The pinion gear 34 drives the large gear 32 to rotate. The large gear 32 and the spur gear 23 rotate synchronously. The second bevel gear 25 drives the helical gear 24 to rotate. The helical gear 24 and the ball screw 16 rotate synchronously. The ball nut 14 and the push rod 15 are fixedly connected. Driven by the ball screw 16 and constrained by the third bearing seat 17, the ball nut 14 moves linearly downward. A first T-shaped block 18 is fixedly connected to the lower end of the push rod 15, and the first T-shaped block 18 is in tangential contact with the first sleeve 27. The first sleeve 27 is mounted on the first pin 28, which is fixedly connected to the lever beam 29; the ball nut 14 drives the push rod 15 and the first T-block 18 to move downward; the lever beam 19 converts the linear motion of the first T-block 18 into rotational motion, and converts the thrust of the first T-block 18 into torque; the lever beam 29 transmits the torque to the hollow shaft 30, which is keyed to the shaft of the ball valve, driving the valve shaft to rotate; at the same time, the other end of the lever beam 29 moves upward, pushing the second T-block 37, the executive shaft 1 and the spring seat upward, compressing the energy storage spring; when the first pin 28 contacts the limit block 26, the load on the motor 9 suddenly increases, and the electrical control box detects the current value and cuts off the power supply, and the motor 9 stops rotating. At this time, the executive shaft 1 has been locked by the trigger mechanism, and the energy storage spring remains in a compressed energy storage state;

[0063] After the electrical control box receives the position feedback signal from the position sensor 5, it drives the motor 9 to rotate in the opposite direction; contrary to the above process, the ball nut 14 drives the push rod 15 and the first T-shaped block 18 to move upward; after the ball nut 14 touches the first bevel gear 24, the current value of the motor 9 suddenly increases, and the electrical control box detects the current change and cuts off the power supply, the motor 9 stops rotating, and the electric valve opening action is completed.

[0064] When the trigger mechanism of the mechanical control box is triggered, the energy storage spring releases its elastic force, pushing the spring base, the actuator shaft 1, and the second T-shaped block 37 downward; the lever beam 29 converts the thrust of the second T-shaped block 37 into torque, and converts the linear motion into rotational motion; the lever beam 29 drives the hollow shaft 30 and the ball valve shaft to rotate, and stops when the first pin shaft 28 touches the first limit pin 26; the electrical control box receives the feedback signal of the position sensor 5, and the emergency valve closing action is completed.

[0065] When manual operation is required to open the valve on site, the handle 6 is manually pushed to drive the manual shaft 7 to overcome the elastic force of the spring 44 and connect with the bevel gear shaft 43; then the handle 6 is rotated in sequence to drive the manual shaft 7, the bevel gear shaft 43, the second bevel gear 25, the first bevel gear 24 and the ball screw 16 to rotate; the manual valve opening action is completed in the same way as the electric operation; after the manual valve opening action is completed, it must be manually rotated in the opposite direction to return the ball nut 14 to its initial position; the manual shaft 7 is disengaged from the bevel gear shaft 43 under the elastic force of the spring 44, and the manual valve opening action is completed.

[0066] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An actuator for an emergency shut-off valve, characterized in that: include: Box; A hollow shaft (30) connected to the valve shaft of the ball valve, with both ends thereof being rotatably connected to the two vertical plates of the box body; Lever beam (29); the hollow shaft (30) passes through the lever beam (29) and is fixedly connected to the lever beam (29); Two sets of limit pins are fixedly arranged on the vertical plate of the box body to limit the rotation angle of the lever beam (29) so that the allowed rotation angle of the lever beam (29) matches the switch position of the ball valve; An actuator shaft (1), the upper end of which is connected to the spring base of the energy storage spring of the mechanical control box for the emergency shut-off valve, and the lower end of which passes through the top of the box and abuts against one end of the lever beam (29); The push rod (15) is driven by the screw transmission assembly to move up and down in the box; the lower end of the push rod (15) abuts against the other end of the lever beam (29); A manual drive assembly is rotatably arranged outside the box body and drives the screw drive assembly to rotate through the bevel gear drive assembly; An electric drive assembly is fixedly mounted on the outside of the box; the output end of the electric drive assembly is driven by the bevel gear transmission assembly through the gear transmission assembly; The box body is composed of an upper cover (2), a guard plate (3), a mounting plate (4), a left side plate (10), a main plate (11), a right side plate (12) and a bottom plate (13) to form a closed box body; the mounting plate (4) and the guard plate (3) constitute one of the vertical plates; the two ends of the hollow shaft (30) are rotatably connected to the mounting plate (4) and the main plate (11) through a first bearing seat (19) and a second bearing seat (36) respectively; The screw transmission assembly comprises: A ball nut (14) is fixedly mounted on the top end of the push rod (15); The third bearing seat (17) is fixedly arranged on the main board (11); the push rod (15) is provided with a square groove, and the inner wall of the square groove abuts against two sides of the third bearing seat (17); The ball screw (16) passes through the ball nut (14) and the push rod (15) in sequence and is threadedly engaged with the ball nut (14); one end of the ball screw (16) is rotatably connected to the upper cover (2), and the other end is fixed in the third bearing seat (17).

2. The actuator for an emergency shut-off valve according to claim 1, characterized in that: It also includes a position sensor (5), the input end of which cooperates with one end of the hollow shaft (30).

3. The actuator for an emergency shut-off valve according to claim 1, characterized in that: Also includes: A first pin (28) and a second pin (31) pass through both ends of the lever beam (29) and are fixedly connected to the lever beam (29); A first shaft sleeve (27) and a second shaft sleeve (38) are rotatably connected to one end of the first pin shaft (28) and the second pin shaft (31), respectively; a first T-shaped block (18) is fixedly provided at the lower end of the push rod (15), and a second T-shaped block (37) is fixedly provided at the lower end of the actuator shaft (1); The tops of the first shaft sleeve (27) and the second shaft sleeve (38) respectively contact the bottoms of the first T-shaped block (18) and the second T-shaped block (37).

4. The actuator for an emergency shut-off valve according to claim 3, characterized in that: The two groups of limit pins include a first limit pin (26) and a second limit pin (35); the first limit pin (26) and the second limit pin (35) are both fixedly arranged on the main board (11); when the lever beam (29) rotates to a certain angle, the other ends of the first pin shaft (28) and the second pin shaft (31) respectively abut against the first limit pin (26) and the second limit pin (35), and the movement is restricted.

5. The actuator for an emergency shut-off valve according to claim 1, characterized in that: The bevel gear transmission assembly comprises: a first bevel gear (24) fixedly disposed on the upper end of the ball screw (16); A bevel gear shaft (43) is rotatably mounted on the main board (11) via a first bearing seat component (42); The second bevel gear (25) is fixedly arranged on the bevel gear shaft (43) and meshes with the first bevel gear (24).

6. The actuator for an emergency shut-off valve according to claim 5, characterized in that: The manual drive assembly comprises: Spring (44); the bevel gear shaft (43) is a square shaft, and the spring (44) is fixedly arranged on the bevel gear shaft (43); A first linear bearing (8) fixedly disposed in the first bearing seat component (42); A manual shaft (7), one end of which is fixedly arranged in the first linear bearing (8); a square hole matching the square shaft of the bevel gear shaft (43) is opened at one end of the manual shaft (7); A handle (6) is fixedly arranged on the other end of the manual shaft (7).

7. The actuator for an emergency shut-off valve according to claim 5, characterized in that: The electric drive assembly is a motor (9); the gear transmission assembly comprises: A spur gear (23) fixedly disposed on the bevel gear shaft (43); A second bearing seat component (40) is fixedly disposed on the main board (11); A large gear (32) is rotatably mounted on the second bearing seat component (40) via a spur gear shaft (21); the large gear (32) is meshed with the spur gear (23); The helical gear shaft (39) is rotatably mounted on the main board (11) through the third bearing seat component (41); A helical gear (33) is fixedly arranged on the helical gear shaft (39); the output shaft of the motor (9) is fixed with a motor helical gear (22); the motor helical gear (22) is meshed with the helical gear (33); A small gear (34) is fixedly arranged on the helical gear shaft (39); the small gear (34) is meshed with the large gear (32).

8. The actuator for an emergency shut-off valve according to claim 1, characterized in that: The execution shaft (1) is mounted on the upper cover (2) via a second linear bearing (20).

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