CN2440996Y

CN2440996Y - Partly sustained pneumatic device for rotary valve

Info

Publication number: CN2440996Y
Application number: CN 00248020
Authority: CN
Inventors: 章锡明; 章祖翼
Original assignee: Individual
Current assignee: Individual
Priority date: 2000-08-23
Filing date: 2000-08-23
Publication date: 2001-08-01
Anticipated expiration: 2010-08-23

Abstract

The utility model relates to a part slow-closing pneumatic device for rotary valves. The utility model is provided with a cylinder body. The lower part of the cylinder body is connected with a valve. Both ends of the cylinder body are provided with cylinder caps. Pistons are arranged in an inner cavity of the cylinder body. Gear racks of the pistons are meshed with an output shaft of a gear wheel. The pistons are two reciprocating gear rack pistons which synchronously and reversely move along the axis direction, and the gear racks of the two pistons are meshed with the output shaft of a gear wheel from both sides. The movements of the two pistons are controlled by a built-in air supply and exhaust pipeline. The utility model has the advantages of compact structure, constant torque and large torque output, divides the closing process of the valve into a fast-closing and a slow-closing two processes, and achieves the purpose of reduction of water hammer effect.

Description

Part rotary type valve Slow Close Pneumatic actuator

The utility model relates to the valve actuator field, refers more particularly to part rotary type (output shaft angle of revolution scope is 0 °～90 °) valve Pneumatic actuator technology.

The pneumatic valve of the supporting compositions of part rotary type valve such as part rotary type valve Pneumatic actuator and butterfly valve, ball valve, stopcock; be widely used in having anti-inflammable, anti-explosive, strict environmental protection requirement arranged or be not suitable in the occasion such as on-site manual operation, it has realized the single and centralized control and the distant control of pipe-line system.

When part rotary type valve and traditional part rotary type valve Pneumatic actuator auxiliary work, the opening-closing process of valve is with constant angular velocity revolution basically, this valve in being applied to supply channel, especially in the closed procedure of the pass of valve, very easily cause " water hammer " effect of pipe-line system, the pipe-line system pressure medium is high more, " water hammer " effect that is produced during valve closing is also just more for serious, not only made noise, influence human life health, even threaten the safety and the proper functioning of pipe-line system.

The purpose of this utility model is the defective that exists at traditional part rotary type valve Pneumatic actuator, a kind of permanent torque output that has is provided, can with the supporting composition pneumatic valve of part rotary type valve, when carrying out the closing motion of valve, 85～90% of elder generation's quick closedown total travel, reach and block the function that most of medium plays safety check, close to complete shut-down then at a slow speed, play the effect that elimination " water hammer " endangers, cushions and dams, and the Slow Close time is adjustable, the part rotary type valve Slow Close Pneumatic actuator that the limit position of valve closing is adjustable.

The technological scheme of part rotary type valve Slow Close Pneumatic actuator of the present utility model is: a cylinder body, the bottom is connected with valve, cylinder cap is installed at the cylinder body two ends, inner chamber of cylinder block is equipped with piston, tooth bar is arranged on the piston, and the rack and pinion output shaft is meshed, it is characterized in that described piston be meant two along the axial direction synchronous backward and the row reciprocating type rack piston, tooth bar on the two-piston is meshed with gear output shaft from both sides, and the motion of two-piston is subjected to control for gas exhaust piping.

The utility model part rotary type valve Slow Close Pneumatic actuator, it is described to be for exhaust port a with for exhaust port b for gas exhaust piping, inner chamber for the straight-through cylinder body of exhaust port b, communicate with pipeline c, d in being built in the cylinder body casing wall for exhaust port a, built-in pipeline c, d communicate with built-in Slow Close pipeline on the cylinder cap respectively.

The utility model part rotary type valve Slow Close Pneumatic actuator, built-in Slow Close pipeline is that the buffer cavity of cylinder cap body inboard is communicated with unidirectional valve opening, throttle bore on its cylinder cap, nonreturn valve core and spring are installed in the unidirectional valve opening, throttling valve core is installed in the throttle bore, buffer cavity on the cylinder cap and the buffer plunger corresponding matching on the rack piston are equipped with stop screw on the cylinder cap body of buffer cavity opposite side.

The utility model discloses and the supporting Slow Close Pneumatic actuator of part rotary type valve, compared with the prior art, have following characteristics:

1, adopt two rack pistons to mesh transmitting torque from both sides and gear output shaft simultaneously, output torque is big, stable action.

2, be built in the casing wall of cylinder body and the cylinder cap for gas exhaust piping, do not have any external control bypass, compact structure, volume is light and handy.

3, cylinder cap for being shaped on buffer cavity, nonreturn valve core and throttling valve core on the gas exhaust piping, make valve realize closing at a slow speed at the after-stage that closes closed procedure, effectively eliminate " water hammer " harm, prolong the working life of pipe-line system.

The drawing of accompanying drawing is described as follows:

Fig. 1 is the front view of part rotary type valve Slow Close Pneumatic actuator of the present utility model.

Fig. 2 is the A-A sectional view of part rotary type valve Slow Close Pneumatic actuator of the present utility model.

Now embodiment of the present utility model is done detailed explanation in conjunction with Fig. 1, Fig. 2:

1,9 cylinder caps; 2,6 rack pistons; 3 Sealings; 4 gear output shafts; 5 cylinder bodies; 7 throttle bore; 8 throttling valve core; 10 stop screws; 11 buffer cavitys; 12 buffer plungers; 13 nonreturn valve cores; 14 springs; 15 unidirectional valve openings; 16 pipeline d; 17 Sealings; 18 interface a; 19 interface b; 20 pipeline c; 21,22 Sealings.

The utility model relates to part rotary type valve Slow Close Pneumatic actuator, the cylinder cap 1,9 that cylinder body 5 and cylinder body two ends are arranged, two rack pistons 2,6 are installed in cylinder body 5, and the tooth bar on the piston is from both sides and gear output shaft 4 engagements, and the motion of two-piston is subjected to control for gas exhaust piping.Be built in the casing wall and cylinder cap of cylinder body for gas exhaust piping, have and connect outer supplying exhaust port (a) 18 and supplying exhaust port (b) 19 for gas exhaust piping, inner chamber for exhaust port (b) 19 straight-through cylinder bodies 5, confession exhaust port (a) 18 communicates with confession gas exhaust piping (c, d) 20,16 in the casing wall that is built in cylinder body, communicate with Slow Close pipeline in the cylinder cap 1,9 respectively for gas exhaust piping (c, d) 20,16, the Slow Close pipeline in the cylinder cap 1,9 is made up of the buffer cavity 11, unidirectional valve opening 15, the throttle bore 7 that are communicated with cylinder cap body inboard.Throttling valve core 8 is installed in the throttle bore 7, nonreturn valve core 13 and spring 14 are installed in the unidirectional valve opening, the buffer cavity of cylinder cap inboard cooperates with buffer plunger 12 on the rack piston, and the opposite side of buffer cavity 11 is equipped with stop screw 10.

Working procedure of the present utility model is as follows: when accompanying drawing is depicted as with the supporting use of part rotary type valve, working condition of the present utility model during valve wide open, when pressure gas enters the middle inner chamber of cylinder body 5 by confession exhaust port (b) 19, rack piston 2,6 under the effect of air pressure, simultaneously to the same moved further in cylinder body 5 two ends, by 4 revolutions of gear engagement driven gear output shaft, the gas of cylinder body 5 two ends cavitys is by cylinder cap 1, buffer cavity 11 on 9 enters built-in pipeline (c, d) 20,16, by constituting the exhaust loop for exhaust port (a) 18, rack piston 2,6 realize fast moving, and this moment, valve was in the quick closedown process; Rack piston 2,6 continues to move to buffer plunger 12 on it and begins to enter buffer cavity 11 in the cylinder cap 1,9, this moment, the gas of cylinder body 5 two ends cavitys entered built-in pipeline (c, d) 20,16 because of the groove of the 13 non-return effects of the non-return valve core on the cylinder cap 1,9 by throttling valve core 8, by constituting the exhaust loop for exhaust port (a) 18, because throttling produces the effect of back pressure, rack piston 2,6 moves at a slow speed after realizing slowing down earlier, valve also is in slow closed condition, until complete shut-down.Only need to adjust the axial position of throttling valve core 8, just can reach the travelling speed of adjusting rack piston 2,6 and the purpose of gear output shaft 4 rotating speed (being the Slow Close speed of valve).Adjust the axial limit position of rack piston 2,6, the limit position of valve plate in the time of can adjusting the valve complete shut-down by suitable adjustment stop screw 10.When infeeding pressure gas from confession exhaust port (a) 18, pressure gas is by the built-in pipeline (c on the cylinder body 5, d) 20,16, back down cylinder cap 1, nonreturn valve core 13 on 9 under light spring 14 effects enters the two ends cavity of cylinder body 5, this moment is because of no throttling action, pressure gas promotes rack piston 2,6 move in the middle of cylinder body 5 simultaneously and rapidly, up to rack piston 2,6 buffer plunger 12 breaks away from cylinder cap 1, buffer cavity 11 on 9, the pressure air to open beginning of this moment is directly entered the cavity at cylinder body 5 two ends by buffer cavity 11, rack piston 2, gas between 6 in the cavity is by constituting the exhaust loop for exhaust port (b) 19, realize rack piston 2,6 move in the middle of cylinder body 5 simultaneously and rapidly, driven gear output shaft 4 fast rotation, be that valve is opened fast, until standard-sized sheet.

Part rotary type valve Slow Close pneumatic means provided by the utility model has the following advantages:

1, volume is gently little, high pulling torque, permanent torque output;

When 2, supporting part rotary type valve uses, divide quick closing valve and two mistakes of Slow Close with the closing process of valve

Journey reaches Slow Close and eliminates the noise, and eliminates the purpose of " water hammer ";

3, the Slow Close time is adjustable;

4, compact conformation, whole pneumatic means only need external for blast pipe, need not external any control bypass;

5, adopt the rigidity power transmission, improved the sensitivity of pneumatic means action and the reliability of work,

Long service life.

Claims

1, part rotary type valve Slow Close Pneumatic actuator, a cylinder body (5), the bottom of cylinder body (5) is connected with valve, cylinder body (5) two ends are equipped with cylinder cap (1,9), in the inner chamber of cylinder body (5) piston is installed, tooth bar is arranged on the piston, rack and pinion output shaft (4) is meshed, it is characterized in that described piston be two along the axial direction synchronous backward and the row reciprocating type rack piston (2,6), tooth bar on the two-piston is meshed with gear output shaft (4) from both sides, and the motion of two-piston is subjected to control for gas exhaust piping.

2, part rotary type valve Slow Close Pneumatic actuator as claimed in claim 1, it is characterized in that: described is for exhaust port a (18), for exhaust port b (19) for gas exhaust piping, inner chamber for the straight-through cylinder body (5) of exhaust port b (19), communicate with pipeline c (20), pipeline d (16) in being built in cylinder body (5) casing wall for exhaust port a (18), built-in pipeline c (20), pipeline d (16) communicate respectively at built-in Slow Close pipeline on the cylinder cap (1,9).

3, part rotary type valve Slow Close Pneumatic actuator as claimed in claim 2, it is characterized in that: cylinder cap (1,9) is gone up built-in Slow Close pipeline, the inboard buffer cavity (11) of cylinder cap (1,9) is communicated with unidirectional valve opening (15), throttle bore (7), nonreturn valve core (13) and spring (14) are installed in the unidirectional valve opening (15), throttling valve core (8) is installed in the throttle bore (7), buffer plunger (12) corresponding matching on buffer cavity (11) on the cylinder cap (1,9) and the rack piston (2,6) is equipped with stop screw (10) on the cylinder cap body of buffer cavity (11) opposite side.