CN201096116Y

CN201096116Y - Air-actuated executor

Info

Publication number: CN201096116Y
Application number: CNU2007200405732U
Authority: CN
Inventors: 陈春华
Original assignee: Individual
Current assignee: Individual
Priority date: 2007-07-05
Filing date: 2007-07-05
Publication date: 2008-08-06
Anticipated expiration: 2017-07-05

Abstract

The utility model discloses an air activator which comprises a casing, a left and a right end covers, a left and a right plungers and an output shaft, wherein, the left and the right plungers and the output shaft are arranged in the casing; the output shaft is arranged at the middle of the left and the right plungers, and is matched with straight-tooth transmission on the left and the right plungers. The utility model is characterized in that the end surface of the output shaft is on the same plane with or below the external surface of the casing; a driving groove of the end part of the output shaft is inwards opened. A limit switch is additionally arranged on the basis; the limit switch is fixedly connected with the top surface of the activator via a fixing piece positioned in the casing. The accessories (such as the limit switch, etc. ) of the air activator can be directly installed on the casing through the arrangement of the end surface of the output shaft lower than the casing, the occupying space is saved, and the assembly is simplified.

Description

Pneumatic actuator

Technical field

The utility model relates to a kind of executive component, is specifically related to a kind of pneumatic actuator, is applicable on various on/off-type such as comprising butterfly valve, ball valve and the adjustment type angular travel valve keying of control valve.

Background technique

Pneumatic actuator is used for the open and close of control valve, be divided into two kinds of straight journey and angle strokes, wherein the operation pressure with the angle stroke is bigger, the valve that is used for strong torsion, its basic structure comprises cylinder block, left and right end cap, and being arranged on left and right piston and output shaft in the cylinder block, output shaft is arranged on the centre in the left and right piston and matches by the straight-tooth transmission.Left and right piston closes up relatively simultaneously or opens, thereby drives output shaft counterclockwise or clockwise rotate, and an end of output shaft is located with the adjustable lever of valve and cooperated, thus the unlatching of control valve or close.

Keying and location for accurate control valve, usually need apolegamy switching mode (as limit switch) or adjustment type (as positioning work piece) annex to combine with pneumatic actuator, in the prior art, for these annexes are installed, the end of the gear shaft outside extending to the final controlling element housing (output shaft) offers drive groove, limit switch or positioning work piece through one with the Steel Support of final controlling element housing bolt after be installed on the final controlling element, the input end on the annex (limit switch or positioning work piece) is connected with drive groove on the gear shaft.

Yet; because annex needs to be installed on the final controlling element by a Steel Support; in support is wrapped in both attachment portion (clamping of output shaft and input end); though helping provides enough join strengths and plays a protective role; but taken installing space, can't realize installing, also improved installation cost in the limited occasion of installing space; make the assembling of annex and final controlling element become complicated simultaneously, be unfavorable for maintenance product.

Summary of the invention

The utility model purpose provides a kind of annex of being convenient to and installs, and takies the little pneumatic actuator of installing space.

For achieving the above object, the technical solution adopted in the utility model is: a kind of pneumatic actuator, comprise housing, left and right end cap, and be arranged on left and right piston and output shaft in the housing, output shaft is arranged on the centre in the left and right piston and matches by the straight-tooth transmission, the end of described output shaft has drive groove, and the end face of described output shaft is concordant or be lower than described housing outer surface, and the drive groove of described output shaft end is inwardly offered.

In conventional solution, tappet in the described pneumatic actuator can be a gear shaft or a declutch shift shaft, utilize present technique, it is concordant or be lower than the purpose of housing outer surface that the two all can utilize mode of jump ring bottom location to reach the end face of output shaft, be that output shaft is not higher than housing, thus, the annex of final controlling element is (as limit switch, positioning work piece etc.) can directly be installed on (the housing bottom surface of annex cooperates with the housing end face of final controlling element) on the housing, the input end of annex is inserted in the interior output shaft drive groove of housing, both connection parts are in housing, thereby saved mounting bracket, dwindled requirement installing space.

Further technological scheme, jump ring and the housing location of described output shaft by being arranged on its bottom.Adopt the jump ring location of bottom, can realize the location between output shaft and housing easily, avoid in the prior art, between output shaft upper end portion and housing, realize the long defective in output shaft upper end portion that the structure of location causes, thereby be more convenient for realizing that the output shaft end face is concordant or be lower than the structure characteristic of housing outer surface.

Identical with the foregoing invention purpose with design, the another kind of technological scheme that the utility model provides is: a kind of pneumatic actuator that has limit switch, comprise final controlling element and the limit switch two-part that are installed on the final controlling element, the described gas device of holding comprises housing, a left side, right end cap, and be arranged on a left side in the housing, right piston and output shaft, output shaft is arranged on a left side, centre in the right piston and with the right side, straight-tooth on the right piston matches, the end of described output shaft has drive groove, the input end of described limit switch is connected with drive groove, by locating at output shaft bottom jump ring, the end face of described output shaft is concordant or be lower than described housing outer surface, the drive groove of described output shaft end is inwardly offered, match with the end face of final controlling element housing in described limit switch housing bottom surface, the fixed block of described limit switch through being positioned at housing fixedlyed connected with the end face of final controlling element, and do not need other annex to realize compact the installation.

In the technique scheme, described final controlling element housing end face offers fixing threaded hole, and the screw rod of described limit switch through matching with fixing threaded hole is fixed on the described final controlling element housing end face.

Because the technique scheme utilization, the advantage that the utility model compared with prior art has is:

1, since in the utility model the output shaft of pneumatic actuator concordant or be lower than surface of shell, and the drive groove of output shaft end is inwardly offered, the housing upper surface does not have projection, the annex that is connected with output shaft can directly be installed on the housing, saved mounting bracket in the past, dwindled taking up room, be convenient in narrow space, install, more effectively prevented scurrying out of jack shaft.

2, owing to saved the support that usefulness is installed, make the installation of annex (as limit switch, positioning work piece etc.) more convenient, saved fabricated material simultaneously, reduced cost, simultaneously, the linkage structure of output shaft and annex is constant, can be directly and the supporting use of existing annex;

3, owing to fixing by the fixed block (screw rod etc.) that is positioned at the limit switch housing between final controlling element and the limit switch, thereby avoid exposing of fixed block, antiseptic property is improved, and is an overall structure after the combination, and is more compact, attractive in appearance.

Description of drawings

Accompanying drawing 1 is the utility model embodiment one structural representation (straight-tooth on piston and the piston does not draw);

Accompanying drawing 2 is the plan view of Fig. 1;

Accompanying drawing 3 is the A-A cut-away view of Fig. 2.

Wherein: 1, housing; 2, output shaft; 3, limit switch; 4, drive groove; 5, end cap; 6, screw rod; 7, jump ring.

Embodiment

Below in conjunction with drawings and Examples the utility model is further described:

Embodiment one: referring to accompanying drawing 1 to shown in the accompanying drawing 3, a kind of pneumatic actuator that has limit switch, comprise final controlling element and limit switch 3 two-part that are installed on the final controlling element, the described gas device of holding comprises housing 1, a left side, right end cap 5, and be arranged on a left side in the housing, right piston and output shaft 2, output shaft is arranged on a left side, centre in the right piston and with the right side, straight-tooth transmission on the right piston matches (having the gear that cooperates with piston rod on the output shaft), the end of described output shaft has drive groove 4, the input end of described limit switch 3 is connected with drive groove 4, by making the end face of described output shaft 2 flush in described housing outer surface in jump ring 7 location, output shaft bottom, the drive groove 4 of described output shaft 2 ends is inwardly offered, match with the end face of final controlling element housing in described limit switch 3 housing bottom surfaces, described final controlling element housing end face offers fixing threaded hole, the screw rod 6 of described limit switch through matching with fixing threaded hole is fixed on the described final controlling element housing end face, screw rod 6 is positioned at the limit switch housing, can avoid exposing, antiseptic property is improved, as shown in Figure 1, limit switch 3 directly is installed on the final controlling element housing, integrity is better, and is more attractive in appearance.

Embodiment two: a kind of pneumatic actuator, comprise housing, left and right end cap, and be arranged on left and right piston and output shaft (gear shaft) in the housing, output shaft (gear shaft) is arranged on the centre in the left and right piston and matches with straight-tooth on right, the right piston, the end of described output shaft has drive groove, the end face of described output shaft is lower than described housing outer surface, and the drive groove of described output shaft end is inwardly offered.In use, final controlling element annex such as limit switch, positioning work piece directly can be installed on the final controlling element housing, its input end inserts in drive groove, saved the mounting bracket of annex, assemble more conveniently, also reduced to install and take up room, be convenient in narrow space, install.

Claims

1. pneumatic actuator, comprise housing, left and right end cap, and be arranged on left and right piston and output shaft in the housing, output shaft is arranged on the centre in the left and right piston and matches by the straight-tooth transmission with left and right piston, the end of output shaft has drive groove, it is characterized in that: the end face of described output shaft is concordant or be lower than described housing outer surface, and the drive groove of described output shaft end is inwardly offered.

2. pneumatic actuator according to claim 1 is characterized in that: the jump ring [7] and housing location of described output shaft by being arranged on its bottom.

3. pneumatic actuator that has limit switch, comprise final controlling element and limit switch [3] two-part that are installed on the final controlling element, the described gas device of holding comprises housing [1], a left side, right end cap [5], and be arranged on a left side in the housing, right piston and output shaft [2], output shaft is arranged on a left side, centre in the right piston and with a left side, the transmission of right piston straight-tooth matches, the end of described output shaft has drive groove [4], the input end of described limit switch is connected with drive groove [4], it is characterized in that: by locating at output shaft bottom jump ring, make that the end face of described output shaft is concordant or be lower than described housing outer surface, the drive groove of described output shaft end [4] is inwardly offered, match with the end face of final controlling element housing in described limit switch housing bottom surface, the fixed block of described limit switch [3] through being positioned at housing directly fixedlyed connected with the end face of final controlling element.

4. the pneumatic actuator that has limit switch according to claim 3, it is characterized in that: described final controlling element housing [1] end face offers fixing threaded hole, and the screw rod [6] of described limit switch through matching with fixing threaded hole is fixed on the described final controlling element housing end face.