Diaphragm type executing mechanism with damping buffering function

Abstract

The utility model belongs to the technical field of valves, and particularly relates to a diaphragm type actuating mechanism with damping and buffering functions, which comprises a spring, an upper diaphragm capsule, a diaphragm, a lower diaphragm capsule, a damping sleeve and a spring seat, the diaphragm is located between the upper diaphragm capsule and the lower diaphragm capsule, the two ends of the diaphragm are fixedly connected with the upper diaphragm capsule and the lower diaphragm capsule, an inner cavity is formed between the upper diaphragm capsule and the lower diaphragm capsule, the middle part of the diaphragm is located in the inner cavity, and the middle part of the diaphragm can move up and down in the inner cavity; the spring and the spring seat are located in the spring cavity, the spring seat is fixedly connected to the diaphragm, one end of the spring is fixedly connected to the spring seat, and the other end is fixedly connected to the top end of the inner side of the upper diaphragm capsule; the damping sleeve is located on the periphery of the spring and fixedly connected to the top end of the inner side of the upper diaphragm capsule. According to the utility model, through the clearance fit between the damping sleeve and the guide sleeve and the arrangement of the plurality of exhaust holes on the damping sleeve, air in the spring cavity cannot be exhausted in time, the action speed of the driving rod is slowed down, a buffering effect is formed, and the diaphragm is prevented from being damaged.

Description

Technical Field

[0001] The utility model belongs to the technical field of valves, and in particular relates to a diaphragm type actuator with a damping buffer function. Background Art

[0002] The diaphragm actuator is a pneumatic actuator, which is mainly used to provide driving force for straight-stroke valves.

[0003] However, in the prior art, due to factors such as too high compressed air pressure and too fast spring force reset, there is a situation where the driving device moves too fast, resulting in excessive impact, and even the diaphragm is torn due to the impact.

[0004] Therefore, it is urgent to design an actuator with damping and buffering function to solve the above technical problems. Utility Model Content

[0005] The utility model aims to provide a diaphragm type actuator with damping and buffering function. The diaphragm type actuator achieves the effect that the air in the spring cavity cannot be discharged in time through the clearance fit between the damping sleeve and the guide sleeve, and a plurality of exhaust holes are provided on the damping sleeve, so as to slow down the movement speed of the driving rod, form a buffering effect, and prevent the diaphragm from being damaged.

[0006] Technical solution to achieve the purpose of this utility model:

[0007] A diaphragm type actuator with damping and buffering function, the diaphragm type actuator comprises: a spring, an upper diaphragm box, a diaphragm, a lower diaphragm box, a damping sleeve, and a spring seat; the diaphragm is located between the upper diaphragm box and the lower diaphragm box, the two ends of the diaphragm are fixedly connected to the upper diaphragm box and the lower diaphragm box, an inner cavity is formed between the upper diaphragm box and the lower diaphragm box, the middle part of the diaphragm is located in the inner cavity, and the middle part of the diaphragm can move up and down in the inner cavity; the spring and the spring seat are located in the spring cavity, the spring seat is fixedly connected to the diaphragm, one end of the spring is fixedly connected to the spring seat, and the other end is fixedly connected to the inner top end of the upper diaphragm box; the damping sleeve is located on the outer periphery of the spring and is fixedly connected to the inner top end of the upper diaphragm box.

[0008] The diaphragm type actuator also includes: a guide sleeve, the inner diameter of the guide sleeve is larger than the outer diameter of the damping sleeve, the guide sleeve is located at the outer periphery of the spring, and is fixedly connected to the spring seat.

[0009] The guide sleeve and the damping sleeve are clearance-matched.

[0010] The damping sleeve is provided with a plurality of exhaust holes penetrating the side wall of the damping sleeve.

[0011] The damping sleeve is fixedly connected to the inner top end of the upper diaphragm box by welding.

[0012] The guide sleeve is fixedly connected to the spring seat by welding.

[0013] The upper diaphragm box, the diaphragm and the lower diaphragm box are fixedly connected by bolts and nuts.

[0014] The beneficial technical effects of the utility model are:

[0015] 1. The utility model provides a diaphragm type actuator with damping and buffering function. A plurality of exhaust holes are designed on the damping sleeve, and a matching gap is designed between the guide sleeve and the damping sleeve. During the reciprocating motion of the actuator, the exhaust holes of the damping sleeve exposed to the outside also change accordingly, so that the air in the spring cavity cannot be discharged in time, thereby forming a damping effect.

[0016] 2. The utility model provides a diaphragm type actuator with a damping buffering function, which achieves a buffering purpose during the operation of the diaphragm type actuator by generating a damping effect, thereby reducing impact and preventing damage to the diaphragm.

[0017] 3. The utility model provides a diaphragm-type actuator with a damping and buffering function, which achieves a technical effect of buffering during the operation of the diaphragm-type actuator by controlling the number of exhaust holes exposed to the outside of the damping sleeve. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the structure of a diaphragm type actuator with damping and buffering function provided by the utility model;

[0019] Figure 2 This is a partial enlarged view of the damping structure in a diaphragm-type actuator with damping buffering function provided by the utility model;

[0020] Figure 3 A schematic diagram of the position of minimum damping effect in a diaphragm-type actuator with damping buffer function provided by the utility model;

[0021] Figure 4 The utility model provides a diaphragm-type actuator with a damping buffer function, and a schematic diagram of the maximum damping effect position.

[0022] In the figure: 1-spring; 2-upper diaphragm box; 3-diaphragm; 4-lower diaphragm box; 5-driving rod; 6-damping sleeve; 7-guide sleeve; 8-spring seat; 9-exhaust hole. DETAILED DESCRIPTION

[0023] The utility model is further described in detail below with reference to the accompanying drawings and embodiments.

[0024] like Figure 1-2 As shown, the utility model provides a diaphragm type actuator with damping and buffering function, comprising: a spring 1, an upper diaphragm box 2, a diaphragm 3, a lower diaphragm box 4, a driving rod 5, a damping sleeve 6, a guide sleeve 7, and a spring seat 8.

[0025] The diaphragm 3 is located between the upper diaphragm box 2 and the lower diaphragm box 4. Both ends of the diaphragm 3 are fixedly connected to the upper diaphragm box 2 and the lower diaphragm box 4 by bolts and nuts. An inner cavity is formed between the upper diaphragm box 2 and the lower diaphragm box 4. The middle part of the diaphragm 3 is located in the inner cavity. The middle part of the diaphragm 3 can move up and down in the inner cavity.

[0026] The spring 1 and the spring seat 8 are located in the spring cavity. The spring seat 8 is fixedly connected to the diaphragm 3 . One end of the spring 1 is fixedly connected to the spring seat 8 , and the other end is fixedly connected to the top inner side of the upper diaphragm box 2 .

[0027] like Figure 2 As shown, a plurality of exhaust holes 9 are provided on the damping sleeve 6, which is located on the outer periphery of the spring 1 and is fixedly connected to the inner top of the upper diaphragm box 2 by welding. The inner diameter of the guide sleeve 7 is larger than the outer diameter of the damping sleeve 6, and the guide sleeve 7 is located on the outer periphery of the spring 1 and is fixedly connected to the spring seat 8 by welding. The guide sleeve 7 and the damping sleeve 6 are clearance-fitted.

[0028] like Figure 3 As shown, when the fitting distance between the damping sleeve 6 and the guide sleeve 7 is the smallest, all the exhaust holes are outside the guide sleeve 7. At this time, the damping effect is the smallest and the actuator moves the fastest.

[0029] Figure 4 As shown, when the fitting distance between the damping sleeve 6 and the guide sleeve 7 is the largest, the exhaust holes are completely surrounded by the guide sleeve 7, and the exhaust is only exhausted through the gap between the damping sleeve 6 and the guide sleeve 7. The damping effect is the largest and the actuator moves the slowest.

[0030] There are two working processes when the diaphragm actuator works:

[0031] 1. Introduce compressed air to overcome the spring force;

[0032] 2. When exhausting, the spring force pushes the driving rod to reset;

[0033] The reciprocating motion of the driving rod is achieved through the above two processes to provide driving force.

[0034] The utility model provides a diaphragm type actuator with a damping buffer function, which realizes a damping effect by exhausting the spring cavity through changes in the spring cavity exhaust holes.

[0035] When the diaphragm 3 moves up and down, the guide sleeve 7 moves up and down accordingly, the length of the damping sleeve 6 and the guide sleeve 7 changes accordingly, the exhaust holes of the damping sleeve 6 exposed outside the guide sleeve 7 decrease accordingly, the exhaust speed slows down, and the damping effect is achieved.

[0036] A plurality of exhaust holes are designed on the circumference of the damping sleeve 6 for exhausting air.

[0037] When the actuator moves up and down under the action of compressed air or spring force, the spring seat 8 drives the guide sleeve 7 and the damping sleeve 6 to move up and down.

[0038] As the guide sleeve 7 moves upward, the length of the damping sleeve 6 inserted into the guide sleeve 7 gradually becomes longer, and the number of exhaust holes exposed outside the damping sleeve 6 gradually decreases. The compressed air in the spring cavity cannot be discharged in time, forming a damping effect, achieving the purpose of buffering, and effectively reducing the impact generated during the operation of the actuator.

[0039] When the diaphragm actuator overcomes the spring action under the action of compressed air or performs a reset action under the action of the spring force, a damping buffer formed by the damping sleeve 6 and the guide sleeve 7 forms a buffering effect, slowing down the action speed of the drive rod and forming a buffering effect.

[0040] The utility model is described in detail above with reference to the accompanying drawings and embodiments, but the utility model is not limited to the above embodiments, and various changes can be made within the knowledge of ordinary technicians in the field without departing from the purpose of the utility model. The contents not described in detail in the utility model can adopt the existing technology.

Claims

1. A diaphragm actuator with damping function, characterized in that: The diaphragm type actuator comprises: a spring (1), an upper diaphragm box (2), a diaphragm (3), a lower diaphragm box (4), a damping sleeve (6), and a spring seat (8); The diaphragm (3) is located between the upper diaphragm box (2) and the lower diaphragm box (4), and the two ends of the diaphragm (3) are fixedly connected to the upper diaphragm box (2) and the lower diaphragm box (4). An inner cavity is formed between the upper diaphragm box (2) and the lower diaphragm box (4), and the middle part of the diaphragm (3) is located in the inner cavity. The middle part of the diaphragm (3) can move up and down in the inner cavity. The spring (1) and the spring seat (8) are located in the spring cavity, the spring seat (8) is fixedly connected to the diaphragm (3), one end of the spring (1) is fixedly connected to the spring seat (8), and the other end is fixedly connected to the inner top end of the upper diaphragm box (2); the damping sleeve (6) is located on the outer periphery of the spring (1) and is fixedly connected to the inner top end of the upper diaphragm box (2).

2. A diaphragm actuator with damping function according to claim 1, characterized in that: The diaphragm actuator also includes: a guide sleeve (7), the inner diameter of the guide sleeve (7) is larger than the outer diameter of the damping sleeve (6), the guide sleeve (7) is located on the outer periphery of the spring (1), and is fixedly connected to the spring seat (8).

3. A diaphragm actuator with damping function according to claim 2, characterized in that: The guide sleeve (7) and the damping sleeve (6) are clearance-matched.

4. The diaphragm actuator with damping function according to claim 1, characterized in that: The damping sleeve (6) is provided with a plurality of exhaust holes (9) penetrating the side wall of the damping sleeve (6).

5. The diaphragm actuator with damping function according to claim 1, characterized in that: The damping sleeve (6) is fixedly connected to the inner top end of the upper diaphragm box (2) by welding.

6. A diaphragm actuator with damping function according to claim 2, characterized in that: The guide sleeve (7) is fixedly connected to the spring seat (8) by welding.

7. The diaphragm actuator with damping function according to claim 1, characterized in that: The upper diaphragm box (2), the diaphragm (3) and the lower diaphragm box (4) are fixedly connected by bolts and nuts.

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