JPH0531476Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a damper equipped with a shock absorbing device designed to absorb shocks acting on vanes.

[Conventional technology]

For example, as shown in FIG. 9, a conventional damper A of this type includes a portion of the rotating shaft 2 of the blade plate 1 that protrudes upward from the casing 3, and a portion for adjusting the opening/closing angle of the blade plate 1. Between angle adjustment device B,
Some vanes are equipped with a shock absorber C that cushions the impact acting on the blades 1.

That is, in this conventional damper A,
A shaft cylinder 4 fixed to the base of a substantially horizontal angle adjustment arm 5 is rotatably fitted near the upper end of the rotation shaft 2 projecting upward from the casing 3, and
Furthermore, at the upper end of the rotating shaft 2 that protrudes upward,
The base of the nearly horizontal spring setting arm 6 is fitted and fixed by screws 12, and brackets 9 and 10 having an L-shaped front view are attached to the upper surface of each arm 6 and 5.
The horizontal pieces 9a and 10a of the brackets 9a and 10a are respectively pivotally connected with a shaft 14, and each end of a shaft 13 is passed through the upwardly facing pieces 9b and 10b of the brackets 9 and 10, respectively.

One end of the shaft 13 is fixed to the upwardly facing piece 9b of one of the brackets 10 with a flange 13a and a nut 17, and the other end of the shaft 13 is provided with an enlarged diameter head 13b. It is prevented from coming off from the upper piece 9b.

a spring receiver 15 fixed approximately at the center of the shaft 13;
By contracting a conical spring 16 centered on the shaft 13 between the upwardly facing piece 9b of the bracket 9, the upwardly facing piece 9b of the bracket 9 is brought into pressure contact with the inside of the enlarged diameter head 13b of the shaft 13. ing.

The tip of the angle adjustment arm 5 is connected to the casing 3
The support plate 8 is attached to an arc-shaped support plate 8 fixed to the upper surface of the support plate 8.
It is fixed around the rotating shaft 2 so that its angle can be adjusted using a fixing screw 7 and a wing nut 11 that fit into an arc-shaped elongated hole 8a bored in the rotary shaft 2.

Of the above configuration, the angle adjustment arm 5, the support plate 8, the fixing screw 7, the wing nut 11, etc. form an angle adjustment device B for adjusting the opening/closing angle of the blade plate 1, and the brackets 9, 10, shaft 13, a spring receiver 15, a conical spring 16, etc., form a shock absorber C.

As shown by the arrow in FIG. 9, when an impact is applied to the vane plate 1 by the controlled fluid passing through the inside of the casing 3, the setting arm 6 and bracket 9 as well as the rotation shaft 2 compress the conical spring 16. At the same time, the shock is absorbed by slightly rotating it in the counterclockwise direction in FIG.

[Problem that the invention attempts to solve]

However, as mentioned above, the shock absorber C is composed of a large number of components such as the brackets 9 and 10, has a complicated structure, requires a large space, and has many problems such as a high risk of failure.

[Means for solving problems]

The present invention was devised to solve these problems in the prior art, and aims to provide a damper that is simple in structure, compact, and highly reliable in operation, and as a means to achieve this purpose,
A rotation shaft of a blade plate rotatably provided in a casing and an angle adjustment device provided outside the casing and adjusting an opening/closing angle of the blade plate are connected to each other via a shock absorber. A damper comprising: a prismatic inner shell rotatably fitted into a prismatic outer shell, and the shock absorber is placed in a space formed at a corner inside the outer shell on the outer periphery of the inner shell. Either one of the inner shell and the outer shell in the shock absorbing device is constructed of an elastic body that is fitted with an elastic body to impart a fixed position holding action to the outer shell around a central axis line to the inner shell. of,
An arm for adjusting the angle of the vane in the angle adjusting device is fixed to one end of the rotating shaft, and to the other of the inner shell and the outer shell.

[Effect]

With the angle adjustment device fixing the angle adjustment arm at the position where the slats form the desired opening angle,
When a sudden impact from a controlled fluid etc. acts on the vane plate, the elastic body in the shock absorber deforms elastically, causing the inner shell and outer shell to rotate slightly relative to each other, and this relative rotation causes the vane plate and rotation to By slightly rotating the moving shaft relative to the angle adjustment arm fixed by the angle adjustment device, the impact acting on the vane is alleviated.

Also, as the pressure of the controlled fluid increases,
If the elastic body is compressed and used in such a way that the opening degree of the vane plate is reduced, the damper itself can have a flow rate adjustment function that maintains the flow rate of the controlled fluid constant.

〔Example〕

Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 8. Note that the same reference numerals are used for constituent members common to those of the conventional one, and detailed explanation thereof will be omitted.

Figures 1 to 4 show the first damper of the present invention.
An example is shown.

In FIGS. 1 and 2, damper A is
A shock absorber C is provided between the rotation shaft 2 of the blade plate 1 and a rotation shaft device B for adjusting the opening/closing angle of the blade plate 1.

As shown in FIGS. 3 and 4, the shock absorber C includes a prismatic inner shell 1 that is long in the axial direction and has a square cross section.
9, and a rectangular tubular outer shell 2 that is short in the axial direction and has a square cross section.
0 are superimposed with their axes aligned and the phases differing by approximately 45 degrees, and four spaces created at the corners of the outer shell 20 on the outer periphery of the inner shell 19 are filled with cylindrical rubber or the like. It is constructed by compressing an elastic body 21, and the elasticity of the elastic body 21 gives the inner shell 19 a function of holding the outer shell 20 in a fixed position around the central axis.

A hole 19 is provided in the lower end surface of the inner shell 19 into which the upper end 2a of the rotation shaft 2 that projects upward from the casing 3 is fitted.
A is opened, and a screw hole 19b is passed through the hole 19a from the side, and by screwing a set screw 23 (FIG. 1) into the screw hole 19b, the rotation shaft 2
and the inner shell 19 are fixed.

The base end of the angle adjustment arm 5 of the blade plate 1 is fixed to the outer periphery of the outer shell 20, and the outer shell 2 of the inner shell 19 is fixed to the outer periphery of the outer shell 20.
The base end of the spring setting arm 6 is fixed to the upper end surface protruding from the spring.

The spring setting arm 6 is the angle adjustment arm 5.
The receiving piece 6a extends substantially parallel to the same direction as that of the receiving piece 6a, and a receiving piece 6a is vertically provided on one side of the distal end thereof. The receiving piece 6a
faces a support piece 5a erected on one side of the angle adjustment arm 5, and a bolt 22 is threaded through the support piece 5a and abuts against the receiving piece 6a. There is.

By adjusting the degree of advance of the bolt 22, the degree of cushioning of the cylindrical elastic body 21 changes, and by utilizing this, the degree of cushioning of the vane plate 1 can be adjusted.

This setting arm 6, support piece 5a, bolt 2
2 and the like form a buffer degree adjusting device D in the buffer device C.

The angle adjustment device B, like the conventional one, consists of an angle adjustment arm 5, a support plate 8, a fixing screw 7, a wing nut 11, etc., by loosening the wing nut 11 and adjusting the fixing screw 7 to the length of the support plate 8. moving along the hole 8a,
By tightening the wing nut 11 again, the angle of the angle adjusting arm 5 and, as a result, the angle of the blade plate 1 can be adjusted.

Next, the operation of the embodiment configured as described above will be explained.

With the angle adjustment arm 5 fixed by the angle adjustment device B at a position where the blade plate 1 forms a desired opening angle, when a sudden impact from a controlled fluid etc. acts on the blade plate 1, the elasticity in the shock absorber C The body elastically deforms, the inner shell 19 and the outer shell 20 rotate slightly relative to each other, and this relative rotation causes the blade plate 1 and the rotation shaft 2 to rotate.
However, by rotating slightly relative to the angle adjustment arm 5 fixed by the angle adjustment device B, the impact acting on the blade plate 1 is alleviated.

If the amount of advance of the tip of the bolt 22 is increased, the allowable amount of rotation of the spring setting arm 6 in the clockwise direction in FIG. The allowable amount is also limited, and the elastic body is compressed and becomes hard, reducing the degree of cushioning.

Therefore, in this case, the shock absorber C operates only when the impact on the vane plate 1 due to the fluid flowing through the casing 3 is large.

On the other hand, if you reduce the amount of advance of the tip of the bolt 22,
The allowable amount of rotation of the spring setting arm 6 in the clockwise direction in FIG. 2 increases, and accordingly, the amount of allowable rotation of the inner shell 19 relative to the outer shell 20 also increases, and the elastic body becomes softer. The degree of buffering is large.

In this case, the shock absorber C is activated when only a slight impact is applied to the vane plate 1.

Further, in the damper A of the first embodiment, as the pressure of the controlled fluid flowing from the bottom to the top in the drawing of FIG. 2 increases, the elastic body 21
is compressed and the opening degree of the vane plate 1 decreases, so the flow rate of the controlled fluid passing through the damper A is reduced while the pressure of the controlled fluid is within a predetermined range E, as shown in FIG. can always be maintained at a constant value.

6 and 7 show a second embodiment of the invention.

In the embodiment shown in FIG. 2, the spring setting arm 6 is fixed to the side surface of the inner shell 19 so that the spring setting arm 6 receives the tip of the bolt 22 as it is.

By adopting the structure of the second embodiment, the structure is simpler than that of the first embodiment described above, and it can function similarly to that of the first embodiment.

FIG. 8 shows a third embodiment of the present invention.

In the third embodiment, an inner shell 19 in a shock absorber C is pivotally connected to the casing 3 with a shaft 23, and an outer shell 20 fitted around the outer periphery of the inner shell 19 via an elastic body 21 is used for adjustment. Fix arm 5,
This adjustment arm 5 is fixed to the casing 3 with an angle adjustment device B so that its angle can be adjusted.

A long hole 24 is bored in the setting arm 6 fixed to the inner shell 19, and a connecting rod, one end of which is connected to the tip of an arm 25 that is tightly fitted to the rotating shaft 2 of the blade plate 1, is inserted into the long hole 24. Attach the other end of 26 to the bolt/nut 27
The connecting rods 26 and 26 are connected to each other so that their positions can be adjusted using appropriate connecting means such as a bush 28 for rotation.

In the third embodiment, when an impact is applied to the blade plate 1, the elastic body 21 is elastically deformed, so that
The setting arm 6 rotates slightly relative to the adjustment arm 5 fixed to the casing 1, and the arm 25 and the blade plate 1 rotate slightly via the connecting rod 26, so that the impact is alleviated. be done.

Further, as in the case of the first embodiment, as the pressure of the controlled fluid flowing from the bottom to the top in the drawing of FIG. decreases, so damper A
The flow rate of the controlled fluid passing through can always be maintained at a substantially constant value.

In particular, in the third embodiment, since the connecting position of the connecting rod 26 to the setting arm 6 can be adjusted, the setting angle of the blade plate 1 by the angle adjusting device B can be adjusted as shown by the broken line in FIG. When the setting arm 6 is made smaller, the connection position of the connecting rod 26 to the setting arm 6 is brought closer to the shaft 23, thereby shortening the effective length of the setting arm 6, and as shown by the imaginary line in FIG. When the setting angle of the blade plate 1 is increased, the connecting position of the connecting rod 26 to the setting arm 6 is moved away from the shaft 23, and the effective length of the setting arm 6 is lengthened, thereby increasing the setting angle of the blade plate 1. When is small, even if a large fluid pressure is applied to the vane plate 1, the vane plate 1 does not rotate much, and conversely,
If the setting angle of the vane plate 1 is large, the vane plate 1
The vane plate 1 can be made to rotate significantly by applying only a small amount of fluid pressure to the blade.

As a result, the flow rate of the controlled fluid can be made more uniform than in the first embodiment.

Furthermore, by adjusting the connection position of the connecting rod 26 with respect to the setting arm 6, the effective length of the setting arm 6 can be changed, and the degree of cushioning by the elastic body 21 against the impact acting on the vane plate 1 can be adjusted. .

[Modified example]

In the present invention, in addition to the embodiments described above, the following changes and modifications are possible, for example.

(a) The inner shell 19 of the shock absorber C is attached to the angle adjustment arm 5.
In addition, the outer shell 20 is fixed to the rotating shaft 2, respectively.

(b) The shapes of the inner shell 19 and outer shell 21 are triangular and 5
Shall be a square or other polygon.

(c) The inner shell 19 has a cross shape or other shape.

(d) The buffer degree adjustment device D is omitted.

(E) The angle adjustment device B is an electric type that can change the angle of the angle adjustment arm 5 by a drive means (not shown) such as a motor.

(F) In the above (E), the angle of the angle adjustment arm 5 is automatically controlled according to the pressure change of the controlled fluid.

[Effect of idea]

As described above, according to the present invention, the structure of the damper is significantly simpler and more compact than that using conventional metal springs, and as a result, there are fewer points where there is a risk of failure. Improves operational reliability.

[Brief explanation of the drawing]

FIG. 1 is a front view of the first embodiment of the damper of the present invention, FIG. 2 is a plan view of the same damper, FIG. 3 is an enlarged plan view of the main parts of the same damper, and FIG. 4 is
Figure 5 is an enlarged front view of the main parts of the same damper as above.
A diagram showing the relationship between the pressure and flow rate of the controlled fluid when using the damper of the embodiment, FIG. 6 is an enlarged plan view of the main part of the second embodiment of the damper of the present invention, and FIG. 7 is the same as above. FIG. 8 is an enlarged front view of the main parts of the second embodiment, FIG. 8 is a plan view of the third embodiment, and FIG. 9 is a perspective view showing the main parts of a conventional damper. A...damper, B...angle adjustment device, C...
Shock absorber, D...Buffer degree adjustment device, 1...Blade plate, 2...Rotation shaft, 3...Casing, 5...Adjustment arm, 5a...Support piece, 6...Arm for setting, 19 ...Inner shell, 20...Outer shell, 21...Elastic body, 22...Bolt.

Claims (1)

[Claims for Utility Model Registration] (1) A rotation shaft of a blade plate rotatably provided within a casing, and an angle adjustment device provided outside the casing for adjusting the opening/closing angle of the blade plate. and are connected to each other via a shock absorbing device, the shock absorbing device having a prismatic inner shell rotatably fitted into a square tubular outer shell, and an outer shell on the outer periphery of the inner shell. The shock absorber is configured such that an elastic body is fitted into a space formed at an inner corner to give the inner shell a function of holding the outer shell in a fixed position around the central axis. In the angle adjusting device, either one of the inner shell and the outer shell is fixed to one end of the rotation shaft, and the other of the inner shell and the outer shell is fixed to the angle adjusting device.
A damper characterized in that the arm for adjusting the angle of the blade plate is fixed. (2) A shock absorber includes a spring set arm that is fixed to either the inner shell or the outer shell and is substantially parallel to the angle adjustment arm, and a spring set arm that protrudes from the angle adjustment arm and is attached to the spring set arm. a support piece facing the arm for use, and a support piece screwed onto the support piece,
The damper according to claim (1), which is a registered utility model, and further includes a shock absorbing degree adjusting device having a bolt whose tip abuts against the spring setting arm.