CN218913906U

CN218913906U - Straight stroke thrust assembly of electric valve actuator

Info

Publication number: CN218913906U
Application number: CN202223272880.7U
Authority: CN
Inventors: 郑松林
Original assignee: Shanghai Tongfeng Automatic Control Technology Co ltd
Current assignee: Shanghai Tongfeng Automatic Control Technology Co ltd
Priority date: 2022-12-07
Filing date: 2022-12-07
Publication date: 2023-04-25
Anticipated expiration: 2032-12-07

Abstract

The utility model discloses a straight-travel thrust assembly of an electric valve actuator, relates to the field of actuators, and solves the problems of low precision, short service life and the like. The ball screw is arranged in the seat sleeve and matched with the screw nut, a nut seat is fixedly sleeved outside the screw nut, and the driving gear is fixedly connected with the nut seat. The ball nut with high precision converts the movement direction, improves the adjustment precision, has more wear resistance, improves the movement stability, has more reliable structure and prolonged service life, and the output shaft and the ball screw are arranged in a split mode without arranging threads on the output shaft, so that the processing difficulty can be reduced, and the ball nut can be moved more accurately.

Description

Straight stroke thrust assembly of electric valve actuator

Technical Field

The utility model relates to the field of actuators, in particular to a straight travel thrust assembly of an electric valve actuator.

Background

The electric valve actuator is a device which takes the electric energy of motor rotation as a main energy source and changes the electric energy into the linear reciprocating motion of a power output shaft to realize the switching regulation function of the valve. The straight-travel thrust assembly converts the rotary output motion of the electric valve actuator into linear motion to transmit thrust, and the valve opening is regulated by the motion of the valve rod.

The prior Chinese utility model patent: the utility model discloses a (publication number: CN 203847803U) in a straight-travel electric actuator, including support, motor, gear wheel, pinion, axle sleeve, output shaft and but vertical flexible buffer, the gear wheel is direct through axle sleeve and output shaft connection, and the internal thread nut of axle sleeve is worn and torn easily, and after long-term use, the fit clearance between the two increases, reduces the regulation precision, and product life is short, and the reliability is relatively poor.

Disclosure of Invention

The purpose of the utility model is that: in order to overcome the defects of the prior art, the utility model provides a straight stroke thrust assembly of an electric valve actuator, which solves the problems of low precision, short service life and the like.

The technical scheme of the utility model is as follows: the ball screw is arranged in the seat sleeve and matched with the screw nut, a nut seat is fixedly sleeved outside the screw nut, and the driving gear is fixedly connected with the nut seat.

By adopting the technical scheme, the motion direction is converted through the high-precision ball nut, the adjusting precision is improved, the wear resistance is improved, the motion stability is improved, the structure is more reliable, the service life is prolonged, the output shaft and the ball screw are arranged in a split mode, threads are not required to be arranged on the output shaft, the processing difficulty can be reduced, and the ball nut can be moved more accurately.

The utility model is further provided with: the seat sleeve is internally and movably provided with a recoil seat, both ends of the recoil seat are provided with a shaft groove and a rod groove, an output shaft is arranged in the shaft groove and is connected with the recoil seat in a linkage manner, one end of the ball screw is arranged in the rod groove, a screw part is arranged in the shaft groove, and the screw part penetrates into the rod groove from the bottom of the shaft groove and is in threaded connection with one end of the ball screw.

By adopting the further arrangement, the output shaft and the ball screw are linked through the recoil seat, the connecting structure is simple in design, easy to assemble and maintain, and the dust is prevented from entering the ball screw, so that a protection effect is achieved.

Still further, the present utility model provides: the nut seat is provided with a set screw along the radial direction, the periphery of the screw rod nut is provided with a key slot, and the set screw is screwed in from the nut seat and is tightly pressed in the key slot.

By adopting the further arrangement, the synchronism of the movement of the nut seat and the screw nut is ensured.

Still further, the present utility model is provided with: the first bearing is fixedly arranged in the sleeve, and the inner ring of the first bearing is fixedly connected with the periphery of the screw nut.

By adopting the further arrangement, the limit screw nut can only rotate along the circumferential direction, and the lubrication effect is enhanced.

Still further, the present utility model is provided with: the second bearing is fixedly arranged in the seat sleeve, and the inner ring of the second bearing is fixedly connected with the periphery of the nut seat.

By adopting the further arrangement, the limit nut seat can only rotate along the circumferential direction, and the lubrication effect is enhanced.

Still further, the present utility model is provided with: the inside of the seat sleeve is also connected with a side cap in a threaded manner, the side cap is propped against one side of the outer ring of the second bearing, and the side cap is movably sleeved outside the nut seat.

By adopting the further arrangement, the second bearing can be prevented from falling off on the premise that the second bearing has a lubricating effect, parts in the seat cover cannot fall off easily, and the reliability of the structure is improved.

Drawings

FIG. 1 is a schematic diagram of an embodiment of the present utility model;

FIG. 2 is a schematic view of the structure of the output shaft of the present utility model after linear motion;

wherein, 1, the seat cover; 2. an output shaft; 3. a ball screw; 4. a screw nut; 5. a drive gear; 6. a nut seat; 7. a recoil seat; 71. a shaft groove; 72. a screw member; 61. a set screw; 11. a first bearing; 12. a second bearing; 13. and (5) a side cap.

Detailed Description

The straight-travel thrust assembly of the electric valve actuator shown in fig. 1 and 2 comprises a seat cover 1, an output shaft 2, a ball screw 3, a screw nut 4 and a driving gear 5, wherein the seat cover 1 is of a hollow structure, the output shaft 2 and the ball screw 3 are arranged in a split mode and can be connected in a linkage mode along the axial direction of the output shaft 2, the ball screw 3 is movably arranged in the seat cover 1 and is matched with the screw nut 4, a nut seat 6 is fixedly sleeved outside the screw nut 4, and the driving gear 5 is fixedly connected with the nut seat 6. When the driving gear 5 rotates, the nut seat 6 is forced to drive the screw nut 4 to rotate circumferentially, and the ball screw 3 drives the output shaft 2 to move linearly along the axial direction due to the matching of threads.

The seat cover 1 is internally and movably provided with a recoil seat 7, both ends of the recoil seat 7 are provided with a shaft groove 71 and a rod groove, one end of the output shaft 2 is inserted into the shaft groove 71 and is connected with the recoil seat 7 in a linkage manner, one end of the ball screw 3 is inserted into the rod groove, the bottom of the shaft groove 71 is provided with a screw piece 72 in a threaded manner, the screw piece 72 penetrates from the bottom of the shaft groove 71 to the rod groove, and the screw piece 72 penetrates into one end of the ball screw 3 to be connected with an internal thread. Because the output shaft 2, the recoil seat 7 and the ball screw 3 can only move along the axial direction of the output shaft, the recoil seat 7 and the ball screw 3 can be connected only through the screw piece 72, the design is simple, but the movement is effective and the assembly is convenient.

Six set screws 61 are uniformly distributed on the nut seat 6 along the radial direction, corresponding key grooves are formed in the periphery of the screw rod nut 4, and the set screws 61 are screwed in from the nut seat 6 and tightly pressed in the key grooves, so that the nut seat 6 and the screw rod nut 4 can rotate in a linkage manner.

The first bearing 11 is fixedly arranged in the sleeve 1, and the inner ring of the first bearing 11 is fixedly connected with the periphery of the screw nut 4. The second bearing 12 is fixedly arranged in the seat sleeve 1, and the inner ring of the second bearing 12 is fixedly connected with the periphery of the nut seat 6. The outer rings of the first bearing 11 and the second bearing 12 are tightly fitted with the sleeve 1, so that the lead screw nut 4 and the limit nut seat 6 can rotate only in their circumferential directions.

The inside of the seat cover 1 is also provided with a side cap 13, the periphery of the side cap 13 is in threaded connection with the inner wall of the seat cover 1, and the side cap 13 is propped against one side of the outer ring of the second bearing 12, so that the inner ring of the second bearing 12 still has the effect of rotating lubrication; the side cap 13 is movably sleeved outside the nut seat 6 with a certain gap. The fixing of the side cap 13 can avoid the easy falling of the parts in the seat cover 1 due to the excessive pressure of the acting force of the output shaft 2, and the internal structure is more stable and reliable.

Claims

1. A straight stroke thrust assembly of an electric valve actuator is characterized in that: the ball screw is arranged in the seat sleeve and matched with the screw nut, a nut seat is sleeved outside the screw nut fixing sleeve, and the driving gear is fixedly connected with the nut seat.

2. The linear motion thrust assembly of an electrically operated valve actuator of claim 1, wherein: the ball screw is characterized in that a recoil seat is movably arranged in the seat sleeve, shaft grooves and rod grooves are formed in the two ends of the recoil seat, the output shaft is arranged in the shaft grooves and connected with the recoil seat in a linkage mode, one end of the ball screw is arranged in the rod grooves, a screw is arranged in the shaft grooves, and the screw penetrates from the bottoms of the shaft grooves to the rod grooves and is in threaded connection with one end of the ball screw.

3. The direct-travel thrust assembly of an electrically operated valve actuator of claim 1 or 2, wherein: the nut seat is provided with a set screw along the radial direction, the periphery of the screw rod nut is provided with a key slot, and the set screw is screwed in from the nut seat and is tightly pressed in the key slot.

4. The direct-travel thrust assembly of an electrically operated valve actuator of claim 1 or 2, wherein: the inner ring of the first bearing is fixedly connected with the periphery of the screw nut.

5. The direct-travel thrust assembly of an electrically operated valve actuator of claim 1 or 2, wherein: the second bearing is fixedly arranged in the seat sleeve, and the inner ring of the second bearing is fixedly connected with the periphery of the nut seat.

6. The linear motion thrust assembly of an electrically operated valve actuator of claim 5, wherein: the inside of the seat cover is also in threaded connection with a side cap, the side cap is propped against one side of the outer ring of the second bearing, and the side cap is movably sleeved outside the nut seat.