JPS591881B2 - pressure conversion mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mechanism for converting pressure into force or displacement.

More specifically, it is a mechanism that converts fluid pressure into force or displacement by a bellow with a plate-shaped flexure installed inside the bellow at a distance from the central axis, and the bellow is configured to be easy to assemble. It is related to.

SUMMARY OF THE INVENTION 6. It is an object of the present invention to provide a pressure conversion mechanism that is simple in construction, easy to assemble, inexpensive, and compact.

In order to achieve this purpose, a bellows body and two bellow ends each fixed to both ends of the tongue body, at least one of which has a diameter slightly smaller than the inner diameter of the tongue body, are used to control the input pressure. A pressure conversion mechanism is constructed which includes a bellow to be introduced and a plate-shaped flexure having a required spring constant that connects both bellow ends at a position eccentric from the central axis of the bellow body.

The present invention will be explained below with reference to the drawings.

FIG. 1 is an explanatory diagram of the configuration of an embodiment of the present invention.

In the figure, 1 is a bellows into which input pressure is introduced.

The bellows 1 is fixed to a bellows main body 11 having pleats and one end 111 of the bellows main body 11. In this case, the bellows main body 11 is fixed to a disk-shaped first bellows end 12 fixed by welding, and the bellows main body 11 is fixed by welding. It consists of a second bellows end 13 welded to the end 112.

The outer diameter of the second bellows end 13 is configured to be slightly smaller than the inner diameter of the bellows body 11.

2 is a flexure made of a plate-shaped elastic material, and the tongue body 1
1 (in this example, the Ir
j eccentrically), one end is fixed to the bellows end 12 and the other end is fixed to the bellows end 13.

3 is a base to which a bellows end 13 is fixed with a screw 4.

5 is the inlet port, and the input pressure P is passed through this hole through the bellows 1
be introduced within.

The operation of the following configuration will be explained.

When the input pressure P is introduced into the bellows 1, a force corresponding to the effective area of the bellows 1 is generated in the axial direction of the bellows 1.

This force tries to extend the bellows 111 in the line direction, but since the bellows ends 12 and 13 are connected eccentrically with respect to the axis by the flexure 2, the bellows ends 111
2 is inclined in the eccentric direction with respect to M.

By utilizing the displacement caused by this inclination, a pressure→displacement conversion mechanism can be obtained.

Now, if the angle of inclination of the bellows is θ, the relationship with the input pressure P will be as shown in the following equation.

However, θ: Output tilt angle A: Effective area of bellows 1 e: Eccentricity Kf: Rotation spring constant of flexure 2 KB: Rotation spring constant of bellows 1 P: Input pressure Such a device is assembled as follows.

First, 1. Assemble the second bellow ends 12 and 13 and the flexure 2.

Next, it is inserted into the tongue body 11 from the second bellow end 13 side.

Thus, at the end portions 111, 112, the tongue unit body,
For example, fix it by welding.

In such a device, as shown in FIG. 2, the conventional method of assembling a single bellow is followed, that is, a flexure 2 is attached with a plate-shaped flexure end 21 perpendicular to the flexure 2.
After welding the flexure 21 to the second bellows end 13 and welding the ends 111 and 112, the first bellows end 12 and the flexure end 21 are fixed by screws 6.

In comparison with this, (1) 1st. The second bellow ends 12 and 13 and the flexure 2 are assembled outside the tongue body 11, and this is assembled into the tongue body 11, and the end 11
Assembling is easy as all you have to do is weld 1°112.

(2) In the example shown in Fig. 2, if the flexure length and the free length of the bellows are different, the main body of the bellows will be stretched or contracted, resulting in a tilted body when assembled.

Generally, the free length of the bellows has a relatively large variation in size.

In the device of the present invention, the end portion 112 remains in the free length state.
can be welded, so it is possible to assemble with an initial angle of inclination of always zero.

FIG. 3 is a configuration explanatory diagram of another embodiment of the present invention.

In this embodiment, the outer diameter of the first bellows end 12' is made slightly smaller than the inner diameter of the bellows body 11.
The assembled second bellow ends 12', 13 and flexure 2 are attached to the first bellow body 11. It can be inserted from either side of the second bellows ends 12', 13, making assembly even easier.

As explained above, according to the present invention, both bellow ends are connected at a position eccentric from the central axis of the bellow body, so when configuring a conversion mechanism that extracts pressure as displacement, a new , there is no need to provide a fulcrum mechanism.

In addition, since the plate-shaped flexure has a required spring constant, the free end of the bellows balances the restoring force of the flexure and maintains an equilibrium position, and is displaced in response to input pressure. There is no need for a spring that opposes the fulcrum.

Therefore, it has a simple configuration and can be made inexpensive and compact.

Since at least one of the bellow ends has a diameter slightly smaller than the inner diameter of the bellow body, it is possible to realize a pressure conversion mechanism that is easy to assemble, inexpensive, and compact.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of the construction of one embodiment of the present invention, FIG. 2 is an explanatory diagram of the construction following the method of assembling a single bellow, and FIG. 3 is an explanatory diagram of the construction of another embodiment of the invention. 1... Bellows, 11... Bellow body, 12... 1st
Bellow end, 13...Second bellow end, 2...
Flexure, P...Input pressure.

Claims (1)

[Claims] 1. A bellow into which input pressure is introduced, which is made up of a tongue body and two bellow ends each fixed to both ends of the tongue body, at least one of which has a diameter slightly smaller than the inner diameter of the tongue body; A pressure conversion mechanism comprising a plate-shaped flexure having a required spring constant that connects the two bellow ends at a position eccentric from the central axis of the bellow body.