A linear thrust output device

Abstract

The present invention relates to a linear thrust output device, comprising a thrust conversion assembly, a coupling assembly and a bracket assembly. The thrust conversion assembly is connected to the upper flange of the bracket assembly through the housing thereon; the upper part of the thrust output device is connected to the valve electric actuator through the connecting plate at the upper end of the thrust conversion assembly, and the lower part is connected to the valve to be driven through the lower flange of the bracket assembly. The present invention has the characteristics of simple structure, flexible configuration, convenient installation and connection, wide application range, etc., and can output linear stroke and thrust by combining with the multi-turn valve electric actuator.

Description

Technical Field

[0001] The invention relates to an electric valve actuator used in the process control field, and in particular to a linear thrust output device used for the electric valve actuator. Background Art

[0002] In the field of process control, many valves are opened and closed by their valve stems driving the valve core to make linear reciprocating motion. This requires that the electric actuators that match such valves must output linear stroke and thrust, rather than directly outputting rotational motion and torque. At present, most of the types that achieve this linear stroke and thrust output are integrated valve electric actuators. The integrated output linear stroke and thrust output electric actuator type is highly targeted and has a narrow scope of application. Summary of the invention

[0003] The purpose of the present invention is to overcome the shortcomings of the integrated output linear stroke and thrust output electric actuator type mentioned in the above background technology, and to provide a linear stroke and thrust output device with a bracket which has a simple structure, flexible configuration, convenient installation and connection, and a wide range of applications, so as to meet the matching requirements of valves whose valve cores perform linear reciprocating motion.

[0004] The technical solution of the present invention is: a thrust output device with a mounting bracket for a valve electric actuator, comprising a thrust conversion assembly, a coupling assembly and a bracket assembly. The thrust conversion assembly comprises a connecting plate, a driving sleeve, a housing, a retaining ring for a hole, a push rod, and a thrust cylindrical roller bearing; the coupling assembly comprises an upper connector and a lower connector; the bracket assembly comprises a bracket upper flange, a support, a bracket lower flange, a scale and a scale fixing strip. The thrust conversion assembly is mounted and connected to the bracket upper flange of the bracket assembly through the housing thereon, the upper coupling of the coupling assembly is threadedly connected to the push rod in the thrust conversion assembly, and the lower coupling is threadedly connected to the valve stem of the matching valve.

[0005] The concave and convex stoppers between the connecting plate and the shell are contact-fitted and positioned, and are connected and fixed by a first hexagon socket head screw.

[0006] The outer cylindrical surfaces at the upper and lower ends of the driving sleeve are respectively rotated in cooperation with the clearance between the connecting plate and the inner hole surface of the shell, and are sealed by a square rubber sealing ring. The end surfaces on both sides of the large outer cylinder of the driving sleeve are respectively in contact with the thrust cylindrical roller bearings and are axially positioned between the connecting plate and the shell. The driving sleeve has no axial movement and only performs rotational motion.

[0007] The push rod is connected to the drive sleeve by a left-handed trapezoidal thread transmission, the push rod is connected to the long rectangular spline in the center of the housing by sliding, and the lower end of the push rod is threadedly connected to the upper coupling of the coupling assembly. The upper end of the drive sleeve is connected to the two claws of the output shaft of the valve electric actuator. The rotary motion and torque output by the valve electric actuator are converted into linear motion and thrust output by the push rod through the drive sleeve, and the linear motion and thrust output by the push rod are transmitted to the valve stem of the valve through the coupling assembly, thereby realizing the opening and closing of the valve.

[0008] The connection disk and the housing are made of grey cast iron. The connection disk and the housing are positioned by contact and fit through concave and convex stoppers, and the two are sealed by end faces of O-rings.

[0009] The outer cylindrical surfaces at the upper and lower ends of the drive sleeve are respectively positioned and matched with the connection plate and the inner hole gap of the shell, and are sealed by a square rubber sealing ring. The upper end of the drive sleeve is a hollow annular two-claw structure.

[0010] The material of the drive sleeve is aluminum bronze, and its upper and lower outer cylindrical surfaces are rotatably matched with the connecting plate and the inner hole surface of the shell, and are axially positioned by upper and lower thrust cylindrical roller bearings arranged on the end surfaces of the large outer circle, the top surface of the inner hole at the lower part of the connecting plate, and the end surface of the positioning convex stopper at the upper end of the shell. The drive sleeve and the push rod are connected by left-handed trapezoidal thread transmission.

[0011] The interior of the shell is a long rectangular inner spline hole, which is axially slidably matched with the rectangular outer spline in the middle of the push rod.

[0012] The connection plate is provided with radial oil injection channel holes inside and a straight-through pressure injection cup is arranged on the outer circumference.

[0013] The inner hole at the lower end of the shell is provided with three annular grooves, in which rubber dustproof sealing rings, Yx-shaped sealing ring retaining rings for the shaft and hole retaining rings are respectively arranged, forming a sealing connection with the smooth outer circle of the lower end of the push rod.

[0014] The right side of the lower part of the shell is provided with an oil drain threaded hole, which is sealed by a copper washer and a hexagonal screw plug.

[0015] The scale has scales indicating the stroke of the push rod and is fixed on the right pillar through a scale fixing strip.

[0016] The upper coupling is threadedly connected to the lower end of the push rod, and the large outer circle of the upper coupling is processed into a truncated cone shape for indicating the scale scale.

[0017] The upper end of the push rod is equipped with a flat washer and a first hexagonal nut.

[0018] The lower ends of the two pillars of the bracket assembly are respectively threadedly connected to the lower flange of the bracket, and the outer cylinders at the upper ends of the two pillars are respectively positioned with the lower end surface of the upper flange of the bracket and the small holes at the left and right ends using one side and two holes, and are locked and fixed by the third hexagonal nut and the fourth spring washer. Two flat surfaces are symmetrically arranged on the side of the outer cylinder at the upper end of the pillar.

[0019] The present invention has the characteristics of simple structure, flexible configuration, convenient installation and connection, and wide application range. It is flexible in configuration with the valve electric actuator, convenient in installation and connection, and easy for enterprise production organization. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of a preferred embodiment of the present invention;

[0021] Parts identification in the figure: 1. First hexagonal nut, 2. Flat washer, 3. Drive sleeve, 4. Straight-through pressure injection oil cup, 5. Housing, 6. First hexagon socket head screw, 7. First spring washer, 8. Copper washer, 9. Hexagonal screw plug, 10. Upper flange of bracket, 11. Second spring washer, 12. Second hexagon socket head screw, 13. Slotted cylindrical head screw, 14. Scale fixing strip, 15. Pillar, 16. Scale, 17. Lower bracket Lan, 18, third hexagon socket head screw, 19, third spring washer, 20, lower connector, 21, upper connector, 22, second hexagon nut, 23, fourth spring washer, 24, third hexagon nut, 25, rubber dustproof seal, 26, Yx-shaped seal for shaft with retaining ring, 27, retaining ring for hole, 28, O-ring, 29, thrust cylindrical roller bearing, 30, connecting plate, 31, square rubber seal, 32, push rod. DETAILED DESCRIPTION

[0022] The present invention will now be described in further detail in conjunction with the accompanying drawings and preferred embodiments. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0023] This embodiment is a thrust output device with a mounting bracket for a valve electric actuator, including a thrust conversion assembly, a coupling assembly and a bracket assembly.

[0024] The thrust conversion assembly includes a connecting plate 30, a drive sleeve 3, a housing 5, a hole retaining ring 27, a push rod 32, a thrust cylindrical roller bearing 29, a square rubber seal 31, an O-ring 28, a first hexagon socket head screw 6, a first spring washer 7, a straight-through pressure-filled oil cup 4, a rubber dustproof seal 25, a Yx-shaped seal ring for the shaft retaining ring 26, a hole retaining ring 27, a copper washer 8, a hexagonal plug 9, a first hexagonal nut 1 and a flat washer 2; the coupling assembly includes an upper connector 21, a lower connector 20, a third hexagon socket head screw 18, a third spring washer 19 and a second hexagonal nut 22; the bracket assembly includes a bracket upper flange 10, a support 15, a bracket lower flange 17, a scale 16, a scale fixing strip 14, a slotted cylindrical head screw 13, a fourth spring washer 23 and a third hexagonal nut 24. The thrust conversion assembly is mounted and connected to the bracket upper flange 10 of the bracket assembly through the housing 5 thereon, the upper coupling 21 of the coupling assembly is threadedly connected to the push rod 32 in the thrust conversion assembly, and the lower coupling 20 is threadedly connected to the valve stem of the matching valve.

[0025] The concave and convex stoppers between the connecting disk 30 and the housing 5 are contact-fitted and positioned, and are connected and fixed by the first hexagon socket head screw. The outer cylindrical surfaces at the upper and lower ends of the drive sleeve 3 are respectively rotated with the clearance between the connecting disk 30 and the inner hole surface of the housing 5. The end surfaces on both sides of the large outer cylinder in the middle of the drive sleeve 3 are respectively contacted and matched with the thrust cylindrical roller bearing 29, and are axially positioned between the connecting disk 30 and the housing 5. The drive sleeve 3 has no axial movement and only performs rotational movement. The push rod 32 is connected to the drive sleeve 3 by left-handed trapezoidal thread transmission, and the push rod 32 is connected to the rectangular spline of the housing 5 for sliding connection. The lower end of the push rod 32 is threadedly connected to the upper coupling 21 of the coupling assembly. The upper end of the drive sleeve 3 is connected to the hollow two claws of the output shaft of the valve electric actuator.

[0026] Working principle: The upper end of the thrust conversion assembly is connected to the valve electric actuator body through the connecting plate 30, and the lower end is connected to the bracket upper flange 10 of the bracket assembly through the housing 5. The bracket assembly is connected to the valve to be driven through the bracket lower flange 17. The drive sleeve 3 only makes rotational motion. The drive sleeve 3 is connected to the push rod 32 with a left-handed trapezoidal thread transmission connection, and the push rod 32 is connected to the housing 5 with a rectangular spline sliding connection. The two claws at the upper end of the drive sleeve 3 receive the rotational motion and torque output from the valve electric actuator, and convert them into linear motion and thrust output through the push rod 32 through the drive sleeve 3. The linear motion and thrust output by the push rod 32 are transmitted to the valve stem of the valve through the coupling assembly, thereby realizing the opening and closing of the valve. The linear motion stroke output by the device is indicated by the upper coupling 21 and the ruler fixed on the right pillar. The maximum stroke of the linear motion output by the device is limited by the upper end face of the rectangular spline of the push rod 32 and the flat washer 2 fixed to the upper end of the push rod 32, that is, when moving downward, it stops until the flat washer 2 contacts the upper end face of the drive sleeve 3, and when moving upward, it stops until the upper end face of the rectangular spline of the push rod 32 contacts the lower end face of the drive sleeve 3.

[0027] By simultaneously changing the lengths of the housing 5, the push rod 32, the support 15 and the scale 16, different linear travel matching requirements of the valve can be met.

[0028] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A linear thrust output device, characterized in that: It includes a thrust conversion assembly, a coupling assembly and a bracket assembly; The thrust conversion assembly includes a connecting plate, a driving sleeve, a housing, a hole retaining ring, a push rod, and a thrust cylindrical roller bearing; The coupling assembly includes an upper coupler and a lower coupler; The support assembly includes a support upper flange, a support column, a support lower flange, a scale and a scale fixing strip; The thrust conversion assembly is mounted and connected to the upper flange of the bracket of the bracket assembly through the housing thereon; The upper part of the thrust output device is connected to the valve electric actuator through the connecting plate at the upper end of the thrust conversion assembly, and the lower part is connected to the valve to be driven through the bracket lower flange of the bracket assembly; the thrust output device is connected to the output shaft of the valve electric actuator through the two claws at the upper end of the driving sleeve, and transmits the rotational motion and torque from the valve electric actuator; the upper coupling of the coupling assembly is connected to the push rod in the thrust conversion assembly through threads, and the lower coupling is connected to the valve stem of the matching valve through threads, and outputs linear motion and thrust to the matching valve; The connection plate and the housing are made of grey cast iron, and are positioned by contact fit between the concave and convex stoppers and sealed by the end faces of O-rings; The connecting plate is provided with radial oil injection channel holes inside and a straight-through pressure injection cup is provided on the outer circumference; The outer cylindrical surfaces at the upper and lower ends of the driving sleeve are respectively rotationally matched with the inner hole surfaces of the connecting plate and the shell, and are sealed by a square rubber sealing ring. The end surfaces on both sides of the large outer cylinder in the middle of the driving sleeve are respectively in contact with the thrust cylindrical roller bearing, and are axially positioned between the top surface of the inner hole at the lower part of the connecting plate and the end surface of the positioning convex stop at the upper end of the shell.

2. A linear thrust output device according to claim 1, characterized in that: The driving sleeve is made of aluminum bronze, and its upper end is a hollow annular two-claw structure. The large cylindrical surface of the driving sleeve is provided with an oil-passing ring groove, and three oil-passing through holes are radially evenly distributed in the ring groove.

3. A linear thrust output device according to claim 2, characterized in that: The upper end of the push rod is equipped with a flat washer and a first hexagonal nut. The upper part of the push rod is connected to the left-handed trapezoidal thread of the driving sleeve. The rectangular external spline in the middle of the push rod is slidably connected to the long rectangular internal spline in the center of the shell. The lower end of the push rod is connected to the upper coupling thread of the coupling assembly.

4. A linear thrust output device according to claim 3, characterized in that: The inner hole at the lower end of the shell is provided with three annular grooves, in which a retaining ring for the hole, a retaining ring for the Yx-shaped sealing ring for the shaft, and a rubber dustproof sealing ring are respectively arranged, forming a sealing connection with the smooth outer circle of the lower end of the push rod.

5. A linear thrust output device according to claim 4, characterized in that: The right side of the lower part of the shell is provided with an oil drain threaded through hole, which is sealed by a copper washer and a hexagonal screw plug.

6. A linear thrust output device according to claim 1, characterized in that: The scale has scales indicating the stroke of the push rod and is fixed on the right pillar through a scale fixing strip.

7. A linear thrust output device according to claim 6, characterized in that: The upper coupling is threadedly connected to the lower end of the push rod, and the second hexagonal nut is locked. The large outer cylinder of the upper coupling is in a truncated cone shape and is used to indicate the scale scale.

8. A linear thrust output device according to claim 1, characterized in that: The lower ends of the two pillars of the bracket assembly are respectively threadedly connected to the lower flange of the bracket, and the outer cylinders at the upper ends of the two pillars are respectively positioned with the lower end surface of the upper flange of the bracket and the small holes on the left and right ends using one side and two holes, and are locked and fixed by hexagonal nuts and spring washers. Two flat surfaces are symmetrically arranged on the side of the outer cylinder at the upper end of the pillar.

9. A linear thrust output device according to claim 1 or 6 or 8, characterized in that: The lengths of the housing, push rod, support and scale are variable.

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