CN219606195U - Thin film type straight stroke actuator - Google Patents

Abstract

The utility model relates to a thin film type straight stroke actuator. The conventional actuator is heavy, long in size, large in installation space, high in single spring parameter, high in processing difficulty, high in manufacturing cost of the whole actuator and low in cost performance. The utility model comprises an upper film cover, a push rod and a lower film cover, wherein the push rod penetrates into enclosed cavities of the upper film cover and the lower film cover from the center of the lower film cover, and the utility model is characterized by further comprising a limiting piece, a membrane and a tray, wherein the limiting piece, the membrane and the tray can be sequentially arranged on the upper part of the push rod downwards in an opening manner, or the upper part of the push rod is upwards arranged in the sequential opening manner of the tray, the membrane and the limiting piece, a detachable fastening piece is arranged at the upper end of the push rod, a plurality of springs are arranged in the tray, and the other ends of the springs are propped against the upper film cover or the lower film cover. Different action modes can be realized by changing the installation sequence of the parts, the spring is flexible and convenient, and the manufacturing cost of the spring is reduced.

Description

Thin film type straight stroke actuator

Technical Field

The utility model belongs to the field of straight travel actuators, and particularly relates to a multi-spring thin film type straight travel actuator for a straight travel automatic valve.

Background

The actuator is a key device for providing power for the automatic control valve, and the thin film actuator has high response speed, sensitive response and good control precision and is widely applied to the automatic control valve. The film type straight stroke actuator adopted by the automatic control valve in the domestic industrial system is mostly a single-spring film type straight stroke actuator, the conventional actuators are heavy, long in size, large in installation space, high in single-spring parameter, high in processing difficulty, high in manufacturing cost of the whole actuator and low in cost performance.

The single-spring thin-film type straight stroke actuator is corresponding to different thrust requirements, spring specifications must be replaced, parts of the single-spring thin-film type straight stroke actuator in a positive and negative action mode are not universal, different parts must be adopted in different action modes, the standardization and modularization degree of products are low, and inconvenience is brought to management of the products; in the field use of the single-spring film type straight stroke actuator, the push rod often swings in an offset manner, the push rod is not isolated and protected from the environment, and after long-term operation, slow blocking occurs in the action, so that the output force of the actuator is greatly reduced.

Disclosure of Invention

Aiming at the problems, the utility model provides the thin film type straight travel actuator, which can realize different action modes by changing the installation sequence of parts, is flexible and convenient, and reduces the manufacturing cost of the spring.

The utility model adopts the following technical scheme: the utility model provides a film formula straight stroke executor, includes upper film lid, push rod and lower film lid, the push rod penetrates in the enclosing cavity of upper die lid and lower film lid from lower film lid center, its characterized in that still includes locating part, diaphragm and tray, locating part, diaphragm and tray can open down pack into push rod upper portion in proper order, perhaps pack into push rod upper portion with the order opening of tray, diaphragm and locating part up, the upper end of push rod sets up detachable fastener, the tray in set up a plurality of springs, the other end of spring supports and leans on upper film lid or lower film lid.

Preferably, the membrane is located between the upper membrane cover and the lower membrane cover, and is divided into an upper airtight air chamber and a lower airtight air chamber, and air holes are formed in the upper membrane cover and the lower membrane cover.

Preferably, the lower membrane cover is fixedly connected with the bracket through bolts and combined washers.

Preferably, a guide seat is arranged in the flange hole at the upper end of the bracket, a second O-shaped ring, a bushing and a dust ring are arranged in the guide seat hole, and the push rod penetrates into the bushing hole arranged in the hole at the upper end of the bracket from the lower part of the lower film cover and penetrates out from the bottom of the upper end of the bracket.

Preferably, the lining inner hole is provided with a polytetrafluoroethylene composite coating with the thickness of 0.4 mm.

Preferably, a spring seat is arranged on the tray, a plurality of bosses are arranged on the spring seat, and the springs are arranged on the bosses.

Preferably, the upper part of the push rod is provided with an O-shaped ring, the end part of the push rod is provided with threads, and the fastening piece is a locking nut matched with the threads.

Preferably, the number of the springs is 4 or 8.

The utility model has the beneficial effects that:

1. the method can realize different action modes by only changing the installation sequence of the parts, can change the action modes on line and is flexible and convenient to operate.

2. The novel actuator adopts a multi-spring structure, so that the load is shared, and the manufacturing cost of the spring is reduced.

3. And the combination of springs with different numbers can be easily realized by adopting a multi-spring structure, so that the requirements of different thrusts are met.

Drawings

Fig. 1 is a schematic structural view of one mode of action of the present utility model.

Figure 2 is an isometric cross-sectional view of the utility model.

Fig. 3 is a schematic structural view of another mode of action of the present utility model.

Fig. 4 is a schematic structural view of a guide holder according to the present utility model.

In the figure: 1. the device comprises an upper membrane cover 2, a membrane 3, a lower membrane cover 4, a spring 5, a tray 6, a spring seat 7, a limit piece 8.O type ring 9, a lock nut 10, an exhaust cap 11, a bolt 12, a guide seat 13, a second O-ring 14, a sealing ring 15, a bushing 16, a dust ring 17, a push rod 18 and a support.

Detailed Description

The utility model will be further illustrated with reference to specific examples.

The thin film type straight travel actuator shown in fig. 1-4 comprises an upper film cover 1, an exhaust cap 10, a tray 5, a spring seat 6, a spring 4, a diaphragm 2, a limiting piece 7, a lower film cover 3, a push rod 17, a guide seat 12, a bushing 15 and other parts.

As shown in fig. 1, the upper end of the push rod 17 is provided with an O-ring 8, the end part is provided with threads, and the push rod is installed in a reaction mode with the sequential openings of the tray 5, the membrane 2 and the limiting piece 7 facing upwards from top to bottom.

As shown in fig. 3, the push rod 17 is installed downwards in the order of the limiting piece 7, the membrane 2 and the tray 5. The lock nut 9 is screwed into the thread section at the upper end of the push rod 17 and is tightly locked, so that the requirements of different action modes are realized, the installation sequence of parts is only needed to be changed, the action modes can be changed on line, and the device is flexible and convenient.

Specifically, the membrane 2 is located between the upper membrane cover 1 and the lower membrane cover 3, and is divided into an upper airtight air chamber and a lower airtight air chamber, and air holes are formed in the upper membrane cover 1 and the lower membrane cover 3 and are used for air intake and air exhaust.

In one embodiment, a spring seat 6 is arranged on the tray 5, 8 bosses are arranged on the spring seat 6, one end of 4 or 8 springs 4 with the same specification are arranged on the boss of the spring seat 6, the plane of the other end is limited by the end face of the upper membrane cover 1 to be compressed, the force generated by compression is the initial load of the spring 4, the air pressure of the initial input signal of the actuator corresponds to the air pressure of the air inlet hole at the bottom of the lower membrane cover 3, when the acting force generated by the air pressure is greater than the initial load of the pre-tightening compression of the spring 4, the air pressure pushes the membrane 2 to generate upward displacement with the push rod 17, and the work of the actuator is realized.

Because the load is shared by the springs, the load required to be borne by the single spring 4 is only 1/4 or 1/8 of the total load, the manufacturing cost of the springs is reduced, the springs with different numbers can be easily combined, and the requirements of different thrusts are met.

As shown in fig. 4, in one embodiment, the lower membrane cover 3 and the bracket 18 are fixedly connected by a bolt 11 and a combined gasket, a guide seat 12 is arranged in a flange hole at the upper end of the bracket 18, a second O-shaped ring 13, a sealing ring 14, a bushing 15 and a dust-proof ring 16 are arranged in a hole of the guide seat 12, and a push rod 17 penetrates into a hole of the bushing 15 arranged in a hole at the upper end of the bracket 18 from below the lower membrane cover 3 and penetrates out from the bottom of the upper end of the bracket 17.

Specifically, a layer of polytetrafluoroethylene composite material with the thickness of 0.4mm is arranged in the inner hole of the bushing 15, the friction coefficient of the material is small, the material has a self-lubricating function, the movement of the push rod 17 is carried out under the guiding of the bushing 15, the friction loss is small, the action is stable, the swing without offset is realized, the stable and reliable action of the actuator is ensured, and the service life is long.

Specifically, the dust ring 16 in the guide seat 12 is tightly stuck to the outer circumference of the push rod 17, so that the problem that dust particles in the external environment enter a gap between the push rod 17 and the bushing 15 to cause slow blocking of the actuator is avoided.

The innovation of the utility model is that:

1. the parts of the positive and negative action modes in the system are universal, the change of the action modes can be realized only by changing the installation sequence, the change of the action modes of the actuator can be finished on line, and the parts are high in universality and quick and convenient.

2. The linear motion of the push rod is guided in the whole process, no deflection exists, the motion is stable, the output force of the actuator is good in linearity, and the actuator is stable and reliable.

3. The lip-shaped edge of the outer circumference of the push rod is covered by the dust ring in the guide seat, and dust particles on the outer circumference are blocked and removed by the dust ring during action, so that the situation that the dust particles in the environment enter gaps between the bushing and the push rod to cause slow blocking of the execution action is avoided.

4. The spring installation quantity is optional, 4 to 8 springs, the output force of the springs with different quantities is variable, the thrust requirements of different valves can be met, the quantity of the springs can be changed on line, the quantity of the springs can be increased or reduced, and the application range of the actuator is wide.

5. The motion of the diaphragm under the pneumatic drive has no friction loss, the action response of the actuator is sensitive, and the output force is constant.

It is to be understood that these examples are illustrative of the present utility model and are not intended to limit the scope of the present utility model. Furthermore, it should be understood that various changes and modifications can be made by one skilled in the art after reading the teachings of the present utility model, and such equivalents are intended to fall within the scope of the utility model as defined in the appended claims.

Claims (8)

1. The utility model provides a film formula straight stroke executor, includes upper film lid, push rod and lower film lid, the push rod penetrates in the enclosing cavity of upper die lid and lower film lid from lower film lid center, its characterized in that still includes locating part (7), diaphragm (2) and tray (5), locating part (7), diaphragm (2) and tray (5) can pack into push rod upper portion down in proper order with the opening, perhaps pack into push rod upper portion with the sequential opening of tray (5), diaphragm (2) and locating part (7) up, the upper end of push rod sets up detachable fastener, the tray in set up a plurality of springs (4), the other end of spring supports and leans on upper film lid or lower film lid.

2. The membrane type straight stroke actuator according to claim 1, wherein the membrane (2) is located between the upper membrane cover (1) and the lower membrane cover (3), and is divided into an upper airtight air chamber and a lower airtight air chamber, and air holes are formed in the upper membrane cover (1) and the lower membrane cover (3).

3. A thin film type straight stroke actuator according to claim 1 or 2, wherein the lower film cover (3) and the bracket (18) are fixedly connected by bolts (11) and combined washers.

4. A thin film type straight travel actuator according to claim 3, characterized in that a guide seat (12) is arranged in a flange hole at the upper end of the bracket (18), a second O-shaped ring (13), a bushing (15) and a dust-proof ring (16) are arranged in the hole of the guide seat (12), and a push rod (17) penetrates into the hole of the bushing (15) arranged in the hole at the upper end of the bracket (18) from the lower part of the lower film cover (3) and penetrates out from the bottom of the upper end of the bracket (18).

5. The thin film type straight stroke actuator as claimed in claim 4, wherein the inner hole of the bushing (15) is provided with a polytetrafluoroethylene composite coating with the thickness of 0.4 mm.

6. The thin-film type straight stroke actuator according to claim 1, wherein a spring seat is arranged on the tray (5), a plurality of bosses are arranged on the spring seat (6), and the springs are arranged on the bosses.

7. The thin-film type straight stroke actuator according to claim 1, wherein the upper part of the push rod (17) is provided with an O-shaped ring (8), the end part of the push rod is provided with threads, and the fastening piece is a locking nut (9) matched with the threads.

8. The thin film linear actuator of claim 1, wherein the number of springs is 4 or 8.