JPS64586Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a device for adjusting the point of action of a pressure sensitive element, particularly a bellows.

Generally, a so-called nozzle flap device is known as a device that can output the displacement of the movable end of a bellows as a pressure-sensitive element.In this type of device, the contact position of the bellows movable end with respect to the flapper beam, in other words, the Although the points are considered to occupy pre-calculated positions, during assembly or maintenance it may be necessary to make fine adjustments to their contact positions.

A conventional device of this kind is known from Utility Model Application No. 116811/1989, which was previously filed by the applicant. In this known example, as shown in FIG. 1, a bellows 1 is airtightly fixed on a base 2, and a conical protrusion 3 is provided at the movable end of the bellows 1, and a support frame 5 is provided with a fulcrum 5a. At a position facing the protrusion 3 of the swingable flapper beam 4, there is a receiving piece 6 formed with a receiving hole 7 that contacts the protrusion 3, and a shaft portion 8 that is eccentric with respect to the position of the receiving hole 7. A receiving plate 11 is screwed onto a threaded shaft 10 which is located at the end of the flapper beam 4 and is rotatable by an adjustment knob 9. ,
A tension spring 12 is interposed between the receiving plate 11 and the beam 4.

Therefore, in the configuration of this known example, the zero point, which is the pressure sensitive reference value of the bellows 1, is adjusted by adjusting the tensile force of the spring 12 by rotating the adjustment knob 9. The contact position between the movable end of the flapper beam 4 and the protrusion 3 can be changed by rotating the receiving piece 6 and utilizing the eccentricity between the shaft portion 8 and the receiving hole 7. In this case, in order for the movement of the contact position of the protrusion 3 due to the rotation of the receiving piece 6 to cause a displacement due to the inclination of the bellows 1, the axial length of this bellows must be long to a certain extent, and the entire The problem was that it was relatively large, making it unsuitable for downsizing.

This invention aims to improve such drawbacks of the conventional art by making it possible to move the bellows interposed between the base and the flapper beam in parallel to the fulcrum of the flapper beam 4, thereby making it possible to move the bellows at the movable end of the bellows. The contact position of the flapper beam, that is, the point of action can be adjusted.

Hereinafter, embodiments of this device will be described in detail with reference to FIGS. 2 to 5.

First, FIGS. 2 and 3 show a first embodiment. That is, in each of these figures, the symbol 1
Reference numeral 3 denotes a base; 14 denotes a pivot portion 1 having one end fixed to the base 13 with a screw or the like, and the other end facing the base 13 in a substantially parallel manner to form a flexure pivot;
The flapper beam 15 is swingable about 4a, and a bellows assembly 15 is interposed between the base 13 and the flapper beam 14.

As is clear from FIG. 3, the bellows assembly 15 consists of a cylindrical bellows 16 and a pair of lid members 17 and 18 that close both open ends of the bellows 16. Member 17,1
8 has shaft portions 21 and 22 that rotatably support the bellows assembly 15 on an eccentric axis 20a that is eccentric by a distance 19 with respect to the axial center line 16a of the bellows 16, and One shaft part 2
1 has a groove 23 and a through hole 24, and the other shaft 22 has a thread 25 and a receiving hole 26 formed as an extension of the through hole 24. As is clear from the figure, this bellows assembly 15 has both shaft portions 2.
By once inserting the shaft rod 27 into the through hole 24 and the receiving hole 26 of 1 and 22, these eccentric axes 2
Both shaft portions 21 and 22 are arranged at positions facing each other so that 0a coincide with each other, and in this state, the bellows 1
6 and each of the lid members 17 and 18 are adhesively fixed.

In the bellows assembly 15, the shaft portion 21 of one of the lid members 17 is fitted into the shaft hole 28 formed in the base 13 via an O-ring 29 coated with silicone grease. As a result, the inside of the bellows 16 is communicated with the pressure feeding hole 30 through the through hole 24 and the shaft hole 28, and the other lid member 1
The shaft portion 22 of No. 8 is fitted into the shaft hole 31 formed in the flapper beam 14, and a fixing nut 33 is tightened on the thread 25 via the spring washer 32. In this state, the slot 22a at the end of the shaft portion 22 is inserted. After confirming that the entire bellows assembly 15 can be rotated smoothly using a screwdriver or the like with a force exceeding a predetermined level,
The thread 25 and the nut 33 are fixed by applying Loctite or the like.

That is, the bellows assembly 15 has shaft portions 21 and 2.
2, the bellows 16 is rotatably supported on an eccentric axis 20a eccentric to the axial center line 16a of the bellows 16.

Further, in FIG. 1, the reference numeral 34 is a tension spring that is stretched over the flapper beam 14, and although the detailed structure is omitted, the tension force thereof can be adjusted appropriately as in the conventional example. . Similarly code 35
is a pneumatic jet nozzle device installed opposite to the end of the flapper beam 14.

Therefore, in the case of the first embodiment, the appropriate elastic force applied to the spring washer 32 ensures that the bellows assembly 15 engages the movable end of the bellows 16 and the flapper beam 14 in a continuous manner, thereby achieving the desired operation. However, during assembly or maintenance, if it is necessary to adjust the contact position of the movable end of the bellows 16 with respect to the flapper beam 14, in other words, the point of action, insert the cutting edge of a screwdriver or the like into the slot 22a at the end of the shaft 22. By inserting the spring washer 32 and applying a rotational force larger than the elastic force applied to the spring washer 32, the entire bellows assembly 15 can be rotated about the eccentric axis 20a. Therefore, there is a gap 19 between the eccentric axis 20a and
The center line 16a of the bellows 16 has an eccentricity of
are moved relative to each other, and the distance 19, and thus the distance between the pivot portion 14a of the flapper beam 14 and the point of action of the bellows 16, can be finely adjusted.

Further, in the second embodiment shown in FIG.
The shaft portion 38 of the flapper beam 14 is fitted into the shaft hole 37 of the other side, and the shaft portion 39 of the flapper beam 14 is fitted into the shaft hole 37 of the other side, and a dolatover groove 40 for rotational adjustment is formed in the shaft hole 37. In this embodiment, the shaft hole 3
6 and 37 constitute a support portion that rotatably supports the bellows assembly 15, and the position of the action point of the bellows 16 can be adjusted using the driver groove 40 as in the first embodiment. It is. Furthermore, in the third embodiment shown in FIG. 5, a part of one shaft portion 21 is exposed to the outside in the first embodiment, and the shape of the exposed outer periphery 41 is, for example, a hexagonal shape on which a spanner can be hooked. By changing the shape etc., the slot 22a is replaced with the above-mentioned slot 22a, and the bellows assembly 1 is similarly assembled by applying a wrench to this outer periphery 41.
5 can be moved eccentrically, thereby adjusting the position of the point of action of the bellows 16 with respect to the flapper beam 14.

As explained above, in this invention, between the base and the flapper beam facing approximately parallel to the base,
A bellows assembly consisting of a cylindrical bellows and a lid member fixed to both open ends of the bellows is interposed, and the bellows are located at positions facing each other and away from the axial center line of the bellows of both lid members. Since the support part that rotatably supports the assembly is provided, the entire bellows assembly can be integrally rotated around the support part to move the bellows parallel to the flapper beam without tilting it. be able to.

Therefore, the position of the point of application of force by the bellows can be easily adjusted with respect to the flapper beam. Moreover, since there is no need to lengthen the bellows in the axial direction in order to absorb the inclination of the bellows as in the conventional case, the bellows can be shortened accordingly and the size can be reduced. Furthermore, the direction in which the bellows is displaced and the force by the bellows acts on the flapper beam,
Since it is possible to always match the direction in which the flapper beam is displaced, the displacement of the bellows can be accurately detected.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway front view showing a bellows action point adjustment device according to a conventional example, and FIG. 2 is a partially cutaway front view showing a first embodiment of the bellows action point adjustment device according to this invention. The third is a cross-sectional view showing the bellows assembly taken out from the above, and FIGS. 4 and 5 are cross-sectional and partial front views showing essential parts of the second and third embodiments. 13...Base, 14...Flatspa beam, 14
a...Flatspa beam pivot point (fulcrum), 15...
...Bellows assembly, 16...Bellows, 17,1
8... Lid member, 19... Eccentric interval, 21, 22...
...Shaft portion, 24...Through hole, 30...Pressure hole, 32...
...Spring washer, 33... Fixing nut, 34... Tension spring, 35... Nozzle device.

Claims (1)

[Scope of utility model registration request] A base 13, a flapper beam 14 facing the base 13 in a substantially parallel manner and swingably supported around a pivot 14a, and a bellows assembly interposed between the flapper beam 14 and the base 13. 15
The bellows assembly 15 is composed of a cylindrical bellows 16 and lid members 17 and 18 fixed to both open ends of the bellows 16. A device for adjusting the point of action of a pressure sensitive element, characterized in that support portions for rotatably supporting the bellows assembly 15 are provided at positions facing each other and away from the axial center line 16a.