JPH0433450Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to an actuator, and in particular to an actuator that can prevent abnormal noise generated inside the actuator from leaking to the outside without damaging the characteristics of the actuator itself. It is.

[Prior art and its problems]

Generally, in the case of an actuator used for an intake control valve, etc., the vertical movement of the rod 2 of the actuator 1 is transmitted to the shaft 11 via the lever 10, as shown in FIG. Since the valve 12 is opened and closed, and the rod 2 swings and moves up and down when the shaft 11 rotates, a gap is required between the lower part 1a of the main body of the actuator 1 and the rod 2. However, when the butterfly valve 12 is fully closed, that is, in the state shown by the chain line in FIG. If an abnormal sound is generated from inside, this abnormal sound will leak to the outside through the gap.

For this reason, as shown in FIG. 4, a boot 13 is attached to cover the gap to prevent abnormal noise from leaking to the outside. However, when the rod 2 is operated, the boot 13 and the rod 2 slide against each other. So,
There is a problem in that the drag force of the boot 13 hinders the operation of the rod 2 and affects the characteristics of the actuator.

This invention solves the problems of the conventional ones as described above, and can prevent the abnormal noise generated inside the actuator when the butterfly valve is fully closed from leaking to the outside.
An object of the present invention is to provide an actuator that does not affect the characteristics of the actuator.

[Means for solving problems]

In order to solve the above problems, this invention is an actuator that is equipped with a rod that protrudes from a hole provided at the bottom of the main body and that can open and close the butterfly valve via a lever, and an annular groove is formed in the rod. and a cylindrical sealing member having an umbrella shape as a whole having a small diameter opening and a large diameter opening larger than the hole, with the large diameter opening facing the lower part of the main body, and The opening is fitted into the groove and fixed, and when the butterfly valve is closed, the large-diameter opening of the sealing member is expanded and elastically comes into close contact with the lower part of the main body to connect with the hole and the rod. The actuator is characterized in that it closes the gap formed between the actuator and the actuator.

[Effect]

In the actuator of this invention configured as described above, it is possible to reliably prevent abnormal noise generated inside the actuator from leaking to the outside when the butterfly valve is fully closed, and
Since the sealing member does not interfere with the operation of the rod, it does not affect the characteristics of the actuator at all.

〔Example〕

Embodiments of this invention shown in the drawings will be described below.

Fig. 1 shows an embodiment of the actuator according to this invention.The actuator shown in this embodiment is of a positive pressure operation type, and the same members as those of the conventional one are given the same numbers. Although the explanation is omitted,
An umbrella-shaped sealing member 3 is attached to the outer periphery of a portion of the rod 2 located inside the actuator 1. That is, the sealing member 3 has a large-diameter opening and a small-diameter opening that are larger in diameter than the hole through which the rod 2 protrudes, and the sealing member 3 has an umbrella-like cylindrical shape as a whole. The small diameter opening is fitted into a groove formed in the outer peripheral surface of the rod 2, with the opening facing toward the lower part 1a of the main body. When positive pressure is applied to the hole 7 of the actuator 1, the diaphragm 6 shown in the solid line moves the rod 2 downward against the biasing force of the spring 8, and this movement of the rod 2 causes the lever to move. Shaft 1 through 10
When the butterfly valve 12 provided in 1 is fully closed, that is, in the state shown by the chain line in FIG.
The sealing member 3 covers and closes the gap between the rod 2 and the hole provided in the lower part 1a of the main body of the actuator 1.

Therefore, in the actuator of this invention shown in FIG. 1, as described above, the butterfly valve 1 to which positive pressure is applied to the hole 7 of the actuator
When the rod 2 is fully closed, the large diameter opening of the umbrella-shaped seal member 3 springs into close contact with the lower part 1a of the main body of the actuator 1, thereby closing the gap between the hole and the rod 2. Since there is a butterfly valve 1
When the actuator 2 is fully closed, the diaphragm 6 located inside the actuator 1 amplifies the vibration, and the internal noise generated by the leakage to the outside can be reliably prevented. Since the sealing member 3 comes into contact with the lower part 1a of the main body of the actuator 1 only at a slightly earlier stage, unlike conventional products, the boot does not interfere with the operation of the rod and does not affect the characteristics of the actuator. This means that there will be no impact on the environment at all.

Fig. 2 shows another embodiment of the actuator according to this invention, and the one shown in this embodiment is a negative pressure operated type, and the same members as those described above are given the same numbers. I will omit the explanation, but
An umbrella-shaped sealing member 3 is attached to the outer periphery of the portion of the rod 2 that protrudes from the main body of the actuator 1, and when negative pressure is applied to the hole 7 of the actuator 1, the rod 2 moves upward, causing the lever 10 to close. When the butterfly valve 12 provided on the shaft 11 via the butterfly valve 12 is fully closed, that is, when the state shown by the solid line in FIG. 2 changes to the state shown by the chain line,
The sealing member 3 is designed to close the gap between the lower part 1a of the main body of the actuator 1 and the rod 2, and even in this case, the butterfly valve 12 cannot be fully closed, as in the previous embodiment. It is possible to reliably prevent abnormal noise that sometimes occurs inside the actuator 1 from leaking to the outside, and it also completely eliminates any influence on the characteristics of the actuator.

[Effect of idea]

By configuring this idea as described above,
It is possible to reliably prevent the abnormal noise generated inside the actuator when the butterfly valve is fully closed from leaking to the outside, and since it does not interfere with the operation of the rod, it does not affect the characteristics of the actuator. completely disappears. In addition, the sealing member can be attached to the rod simply by fitting it, making the installation process easy.Also, since all the opening edges are fitted, it will not be difficult to axially move the rod even after long-term use. In addition, the large-diameter opening of the sealing member elastically contacts the flat surface of the lower part of the main body, resulting in extremely high sealing performance, and the hole and rod can be connected to each other while the hole is covered. Since the gap between the rods is closed, even if the rod swings, it does not engage with the hole, and therefore has the advantage of good durability.

[Brief explanation of drawings]

FIG. 1 is an overall schematic diagram of one embodiment of the actuator according to this invention, FIG. 2 is an entire schematic diagram of another embodiment of the actuator according to this invention, FIG. 3 is an entire schematic diagram of a conventional actuator, and FIG. 1 is a schematic diagram showing a state in which a conventional boot is attached. 1...actuator, 1a...lower part, 2...
Rod, 3... Seal member, 6... Diaphragm, 7... Hole, 8... Spring, 10... Lever, 1
1...Shaft, 12...Butterfly valve, 1
3...Boots.

Claims (1)

[Scope of utility model registration request] An actuator 1 has a rod 2 protruding from a hole provided in a lower part 1a of the main body, and when the rod 2 opens and closes a butterfly valve 12 via a lever 10, the rod moves within the hole.
, an annular groove is formed in the rod 2, and a cylindrical sealing member 3 having an umbrella shape as a whole having a small diameter opening and a large diameter opening larger than the hole is connected to the large diameter opening. Fitting and fixing the small diameter opening into the groove with the small diameter opening facing the lower part 1a of the main body,
When the butterfly valve 12 is closed, the large-diameter opening of the seal member 3 elastically contacts the lower part 1a of the main body in an enlarged diameter state to close the gap formed between the hole and the rod 2. An actuator characterized by: