CN205978753U - Inverse cam formula pneumatic actuator - Google Patents

Abstract

The utility model relates to an inverse cam formula pneumatic actuator, including cylinder body, cylinder cap, piston and transmission shaft, mainly be that the piston adopts the circle trunk piston, circle wall system has the interior guide way of two symmetries in the circle trunk piston, and there is the radian with the lower extreme in interior guide way upper end at circle trunk piston circumferencial direction, the transmission shaft upper end is equipped with the guide bar with interior guide way movable fit, and the transmission shaft lower extreme is equipped with the positioning disk, have the outer guide way of two symmetries in circle trunk piston excircle wall system, be equipped with on the cylinder body with the uide pin of outer guide way movable fit, outer guide way and interior guide way become mirror symmetry on circle trunk piston periphery, the radian at the circumferencial direction between outer guide way upper end and the lower extreme is 45, the radian at the circumferencial direction between interior guide way lower extreme and the upper end is 45. The output torque of its simple structure, low in manufacturing cost, same atmospheric pressure is big, the air consumption is little. Be applicable to right angle gyration valve pneumatic actuator.

Description

Inverse cam formula pneumatic actuator

Technical field

This utility model belongs to valve actuator, especially with regard to a kind of Pneumatic valve actuator.This utility model is suitable for In quarter-turn valve used pneumatic actuator.

Background technology

Typically by cylinder, piston and piston rod, piston rod is connected Pneumatic valve actuator with valve rod, and air pressure promotes piston to make Piston rod and valve rod are for linear motion, promote valve opening and closing operation.If utility model patent number is CN201420421459.4 Twin-tub Subzero valve pneumatic actuator, is made up of lower cylinder body, upper cylinder body, cylinder cap, and upper cylinder body and lower cylinder body constitute obturator, closing There is piston in vivo, the epicoele of piston is provided with spring, and the lower end of piston is connected with the upper end of power transmission shaft, the lower end of power transmission shaft and valve rod Connect.The Pneumatic valve actuator of this structure is only applicable to the executor of the straight stroke valves such as stop valve, gate valve, for such as ball The quarter-turn valve such as valve, butterfly valve is in addition it is also necessary to arrange actuating device, by the rectilinear movement of power transmission shaft between power transmission shaft and valve rod It is converted into the rotary motion of valve rod.Its major defect is complex structure, product cost height；In valve opening and closing whole process, air pressure promotes The rotary speed of valve rod is all equal, and valve opening initial stage and closing need larger air pressure when putting in place, and piston rod occupies Larger area in piston flat surface, reduces the active area of air pressure, and air pressure is low with the transformation efficiency of output torque, air consumption Greatly.

Content of the invention

The purpose of this utility model is the shortcoming existing for prior art, provide that a kind of result is simple, low cost of manufacture, The inverse cam formula pneumatic actuator that effective output is high, air consumption is little of same air pressure.

The technical solution of the utility model includes gray iron, piston and power transmission shaft, cylinder body be provided with air pressure mouth and under Air pressure mouth；Mainly piston adopts drum type brake piston, is formed with two symmetrical interior gathering sills in drum type brake piston inner round wall, inside leads On the close drum type brake piston of groove upper end lid inwall, lower end lead directly to drum type brake piston lower port, interior gathering sill upper end with There is radian, the radian of radian big section and the hypomere thereon in interior gathering sill stage casing in drum type brake piston circumferencial direction in end；Transmission Axle upper end is provided with the guide post of radial direction, moves cooperation, transmission with interior gathering sill in the two ends periphery insertion of guide post in gathering sill Axle lower end is provided with positioning disk, and this positioning disk lower planes is arranged between sealing baffle and cylinder body bottom by bearing；In cylinder Formula outside piston wall is formed with two symmetrical outer gathering sills, and cylinder body is provided with the guide finger moving cooperation with outer gathering sill, outer guiding Groove and interior gathering sill are mirrored into symmetrically, in circumferencial direction between outer gathering sill top and bottom on drum type brake piston periphery Radian is 45 °, and between interior gathering sill lower end and upper end, the radian in circumferencial direction is 45 °.

Preferably, power transmission shaft upper surface is fixedly connected guide plate, and guide plate periphery is moved with drum type brake piston inner round wall joins Close, in guide plate plane, be formed with passage；On guide plate, planar central is fixedly connected with one end of indicating arm, indicating arm another End passes on drum type brake piston outside lid and cylinder body top cover, on indicating arm periphery and drum type brake piston between lid and cylinder body top cover Dynamic sealing coordinates.

Preferably, positioning disk adopts cam mechanism, the locating rod that on cylinder body, the cam of setting and positioning disk mutually contacts, fixed Adopt between position bar and cylinder body and threaded.

The utility model has the advantages that it is mutual with the guide post on power transmission shaft to manufacture gathering sill on drum type brake piston circle wall Cooperation, the rectilinear movement up and down of drum type brake piston is converted into the rotary motion of power transmission shaft, its structure is simple, low cost of manufacture, The output torque of same air pressure is big, air consumption is little.

Brief description

Fig. 1 is structural representation of the present utility model.

Fig. 2 is the structural representation of drum type brake piston in this utility model Fig. 1.

Fig. 3 is the structure sectional view in this utility model Fig. 1 seat A-A direction.

Specific embodiment

Inverse cam formula pneumatic actuator as shown in Figure 1, including cylinder body 4, cylinder cap, piston 7 and power transmission shaft 3, cylinder body 4 sets There are upper air pressure mouth and lower air pressure mouth, upper air pressure mouth is connected with the upper piston chamber of piston 7 upper surface, lower air pressure mouth and piston 7 lower end The lower piston chamber connection in face, cylinder cap is made up of top cover 9 and bottom 1；Piston 7 adopts drum type brake piston, in drum type brake piston inner circle Wall is formed with two symmetrical interior gathering sills 14, the inwall that interior gathering sill 14 upper end is covered on drum type brake piston, and lower end leads directly to circle The lower port of pot type piston, there is radian in drum type brake piston circumferencial direction in interior gathering sill 14 top and bottom, interior gathering sill 14 The radian of the radian in stage casing big section and hypomere thereon, that is, the gradient in interior gathering sill 14 stage casing is more flat, and the gradient at two ends is steeper, Piston 7 shift motion just section and latter end, identical axial displacement produces the less anglec of rotation, exports larger moment, meets Valve opening initial stage and closing latter stage moment are big, open and close the little characteristic requirements of pilot process moment；Power transmission shaft 3 upper end is provided with radially Guide post 10, move cooperation, power transmission shaft 3 lower end with interior gathering sill 14 in gathering sill 14 in the two ends peripheries insertion of guide post 10 Be provided with positioning disk 12, this positioning disk 12 lower planes by bearing 11 be arranged on sealing baffle 2 and cylinder body 4 lower end bottom 1 it Between, between power transmission shaft 3 periphery and sealing baffle 2, dynamic sealing cooperation, makes power transmission shaft 3 can revolve on bottom 1 and sealing baffle 2 Turn, and limit power transmission shaft 3 and move axially；It is formed with two symmetrical outer gathering sills 15 in drum type brake outside piston wall, cylinder body 4 sets There is guide finger 5, outer gathering sill 15 and interior gathering sill 14 mirror image on drum type brake piston periphery moving cooperation with outer gathering sill 15 Symmetrically, that is, outer gathering sill 15 and interior gathering sill 14 are symmetrically distributed in a mid-plane two passing through drum type brake piston centreline Side, outer gathering sill 15 and interior gathering sill 14 form inverse cam formula structure, as shown in Figure 2；Between outer gathering sill 15 top and bottom It is 45 ° in the radian of circumferencial direction, between interior gathering sill 14 lower end and upper end, the radian in circumferencial direction is 45 °, in drum type brake When piston moves a stroke from top to bottom, drum type brake piston opposing cylinder 4 turns clockwise 45 °, and power transmission shaft 3 is with respect to cylinder Formula piston turns clockwise 45 °, so that power transmission shaft 3 opposing cylinder 4 turns clockwise 90 ° it is achieved that power transmission shaft 3 is driven 90 ° The keying operation of turning valve.Under the same displacement of drum type brake piston, power transmission shaft 3 anglec of rotation is less, then output turns Square is bigger, the superposition being rotated with respect to drum type brake piston using drum type brake piston opposing cylinder 4 rotation and power transmission shaft 3, is ensureing The axial length of drum type brake piston in the case that output torque is constant, can be shortened, reduce small product size.Because drum type brake piston is Piston-rodless structure, pressure application surface when upper air pressure mouth and lower air pressure mouth air inlet for the source of the gas amasss identical, reduction promotion drum type brake The bleed pressure of piston, air consumption is little, and compared with prior art air consumption reduces 30%-40%.And, losing bleed pressure In the case of, drum type brake piston reliably stops in the original location, realizes valve location self-locking, need not separately join guarantor position valve.In addition, by right Outer gathering sill 15 and the design of interior gathering sill 14 segmentation gradient, valve opening and closing speed can achieve and changes up pass soon, change down pass soon, open slowly Quick closing valve and slowly change down pass operation.In the present embodiment, middle flat gradient sets suddenly using two ends for outer gathering sill 15 and interior gathering sill 14 Meter, realizes valve and changes down pass operation slowly, suitable valve opening initial stage sealing surface is mutually disengaged and closing puts in place, and sealing surface is mutually pressed The larger operation of tight stage moment of torsion requires.

Power transmission shaft 3 upper surface is fixedly connected guide plate 6, and guide plate 6 periphery moves cooperation with drum type brake piston inner round wall, protects Hold the concentricity of power transmission shaft 3 and drum type brake piston, in guide plate 6 plane, be formed with passage, passage can have several it is ensured that The air pressure of lower air pressure mouth is unobstructed to enter drum type brake piston cavity；On guide plate 6, planar central and one end of indicating arm 8 are fixed Connect, the other end of indicating arm 8 passes outside the top cover 9 of lid and cylinder body 4 upper end on drum type brake piston, the rotation of instruction power transmission shaft 3 Gyration, i.e. valve opening.Dynamic sealing cooperation between lid and top cover 9 on indicating arm 8 periphery and drum type brake piston.

Positioning disk 12 adopts cam structure, the locating rod 13 that on cylinder body 4, the cam of setting and positioning disk 12 mutually contacts, fixed Using threadeding between position bar 13 and cylinder body 4, by adjusting the distance between locating rod 13 end and positioning disk 12 cam, can With control valve closing angle, locating rod 13 has two, and one of is to close valve position positioning, and another is that valve opening position positions, such as Shown in Fig. 3.

Claims (3)

1. a kind of inverse cam formula pneumatic actuator, including cylinder body (4), cylinder cap, piston (7) and power transmission shaft (3), cylinder body sets on (4) There are upper air pressure mouth and lower air pressure mouth；It is characterized in that piston (7) adopts drum type brake piston, be formed with two in drum type brake piston inner round wall Symmetrical interior gathering sill (14), the inwall that interior gathering sill (14) upper end is covered on drum type brake piston, lower end leads directly to drum type brake and lives The lower port of plug, there is radian in drum type brake piston circumferencial direction in interior gathering sill (14) top and bottom, in interior gathering sill (14) The radian of the radian of section big section and hypomere thereon；Power transmission shaft (3) upper end is provided with the guide post (10) of radial direction, guide post (10) Cooperation is moved with interior gathering sill (14) in gathering sill (14), power transmission shaft (3) lower end is provided with positioning disk (12) in the periphery insertion of two ends, This positioning disk (12) lower planes are arranged on sealing baffle (2) and cylinder body by bearing (11)（4）Between the bottom (1) of lower end, Dynamic sealing cooperation between power transmission shaft (3) periphery and sealing baffle (2)；Drum type brake outside piston wall be formed with two symmetrical outer Gathering sill (15), cylinder body (4) is provided with guide finger (5), outer gathering sill (15) and the interior guiding moving cooperation with outer gathering sill (15) Groove (14) specular on drum type brake piston periphery；In the radian of circumferencial direction between outer gathering sill (15) top and bottom For 45 °, interior gathering sill (14) between lower end and upper end circumferencial direction radian be 45 °.

2. inverse cam formula pneumatic actuator according to claim 1, is characterized in that power transmission shaft (3) upper surface is fixedly connected and leads To plate (6), guide plate (6) periphery moves cooperation with drum type brake piston inner round wall, is formed with passage in guide plate (6) plane；Lead It is fixedly connected to the upper planar central of plate (6) with one end of indicating arm (8), the other end of indicating arm (8) passes on drum type brake piston Outside the top cover (9) of lid and cylinder body (4) upper end, dynamic close between lid and top cover (9) on indicating arm (8) periphery and drum type brake piston Envelope cooperation.

3. inverse cam formula pneumatic actuator according to claim 1 and 2, is characterized in that positioning disk (12) adopts cam to tie Structure, the locating rod (13) that the cam of the upper setting of cylinder body (4) and positioning disk (12) mutually contacts, locating rod (13) and cylinder body (4) it Between using threaded.