JP3108567U - Diaphragm actuator - Google Patents

Abstract

[PROBLEMS] To eliminate deterioration of a diaphragm and virtually eliminate the need for replacement of the diaphragm, eliminate the need for precision machining and lubrication of the inner wall surface of the diaphragm casing (cylinder), and reduce manufacturing costs, maintenance costs, and running costs. Reduce.
A diaphragm body B is polymerized on both surfaces of a diaphragm fixing plate 14 with concentric elastomer diaphragms 15 and 15 'having excellent stretchability and toughness, and the diaphragms 15 and 15' are formed as diaphragms. The region t extending between the holding portion of the case 10 and the cover 11 by the flanges 10 'and 11' and the diaphragm pressing plates 16 and 16 is set as a range that can be expanded and contracted, and the diaphragm body B when the diaphragm body B is reciprocated The expansion and contraction of 15, 15 ′ is performed within the region t and through the gap c between the outer peripheral edge of the diaphragm fixing plate 14 and the inner wall surface of the diaphragm casing A.
[Selection] Figure 1

Description

  The present invention relates to a diaphragm actuator and a valve including the same.

  Conventionally, in a diaphragm valve, as illustrated in FIG. 10, a diaphragm fixing plate 2, 2 having a smaller diameter is superposed concentrically on the diaphragm 1, and a diaphragm stem 3 is disposed at the center thereof. Is sandwiched between a diaphragm case 4 and a diaphragm cover 5 constituting the diaphragm casing a.

Diaphragm 1 is usually made of rubber in which reinforcing cloths (such as canvas) are embedded in layers, depending on the pressure resistance and momentum to be set, and has almost no elasticity (for example, Patent Document 1). reference.).
Therefore, the diaphragm 1 is stretched between the holding portion of the case 4 and the cover 5 and the outer peripheral edge of the diaphragm fixing plates 2 and 2 with a predetermined slack s. Thus, a predetermined work is performed through the diaphragm stem 3 which reciprocates within the range of the slack s and simultaneously reciprocates.

  Although the diaphragm 1 has the reinforcing cloth laminated, the diaphragm 1 is caused by deterioration of material fatigue or the like generated in the slack s due to repeated reciprocation, and the reciprocation is exactly as designed. In such a case, there is a disadvantage that it must be replaced with a new one as appropriate.

Further, in a conventionally known cylinder valve, an O-ring fitted on the outer periphery of a valve body incorporated in a reciprocating manner in a cylinder is pressed against the inner wall surface of the cylinder to prevent leakage of the fluid. It is what.
For this reason, the inner wall surface of the cylinder must be precisely machined, and the required lubrication is required for the sliding inner wall surface.
Japanese Utility Model Publication No. 7-32259

  The purpose of the present invention is to make the diaphragm actuator such as a diaphragm valve or a cylinder valve made of an elastomer that is rich in elasticity and toughness, so that it does not easily deteriorate, and it is necessary to replace the diaphragm. There is nothing or at least extremely less than before, and precision machining and lubrication of the inner wall of the cylinder are not required, thereby eliminating the above-mentioned drawbacks and reducing manufacturing costs, maintenance costs, or running costs. It is an object to provide a diaphragm actuator that can be used.

The diaphragm actuator of the present invention according to claim 1 is:
(1) A diaphragm body B having a diaphragm stem C is placed in a diaphragm casing A comprising a diaphragm case 10 and a cover 11, and an outer peripheral edge thereof is disposed between the flanges 10 ′ and 11 ′ of the case 10 and the cover 11. In the diaphragm actuator that is built by sandwiching between
(2) The diaphragm body B is polymerized on both surfaces of the diaphragm fixing plate 14 by concentrating elastomer diaphragms 15 and 15 ′ having excellent stretchability and toughness, and the diaphragms 15 and 15 ′ are diaphragms. The region t extending between the diaphragm case 10 forming the casing A and the flanges 10 ′ and 11 ′ of the cover 11 and the diaphragm pressing plates 16 and 16 is set as a range that can be expanded and contracted, and the diaphragm body B is reciprocated. The diaphragms 15 and 15 ′ are expanded and contracted during the movement in the region t and through the gap c between the outer peripheral edge of the diaphragm fixing plate 14 and the inner wall surface of the diaphragm casing A. .

  The present invention according to claim 2 is the diaphragm actuator according to claim 1, wherein the diaphragms 15 and 15 'of the diaphragm body B are made of polyurethane elastomer.

  In the present invention according to claim 3, the diaphragm body B has a diameter obtained by subtracting the thickness of the diaphragms 15, 15 'from the inner diameter of the diaphragm casing A, so that the diaphragm fixing plate 14 has a diameter. The diaphragm actuator according to claim 1 or 2, wherein the gap c is formed.

  A fourth aspect of the present invention is the diaphragm actuator according to the first, second or third aspect, wherein the diaphragm body B is formed by airtightly dividing the air chambers 12 and 13 on both sides of the diaphragms 15 and 15 '.

  In the present invention according to claim 5, the diaphragm body B is in the expansion / contraction region t of the diaphragms 15 and 15 ', and in a portion corresponding to a side surface of the diaphragm fixing plate 14, that is, a flat surface. The diaphragm actuator according to claim 1, 2, 3 or 4, wherein the wave-shaped portion 18 is molded.

  A ball valve of the present invention according to claim 6 comprises the diaphragm actuator according to claim 1, 2, 3, 4 or 5.

  A cylinder valve according to a seventh aspect of the present invention comprises the diaphragm actuator according to the first, second, third, fourth or fifth aspect.

  According to the present invention, the diaphragm is made of an elastomer that is rich in elasticity and toughness, so unlike a conventional synthetic rubber reinforced with a canvas, deterioration is unlikely to occur and there is a need to replace the diaphragm. , Virtually none, or at least extremely less than before. Therefore, the maintenance cost or running cost can be reduced.

  As the elastomer, a polyurethane elastomer is recognized as being particularly suitable in terms of stretchability and toughness.

  Furthermore, the diaphragm body extends between a diaphragm case of the diaphragm made of an elastomer that is polymerized concentrically on both surfaces of the diaphragm fixing plate, and a sandwiched portion by the flange of the cover and the diaphragm pressing plate. The region t can be expanded and contracted, and the expansion and contraction of the diaphragm during the reciprocating motion of the diaphragm body is within the region t, and the gap c between the outer peripheral edge of the diaphragm fixing plate and the inner wall surface of the diaphragm casing As in a conventionally known cylinder valve, an O-ring fitted on the outer periphery of a valve body reciprocally incorporated in the cylinder is pressed and slid on the inner wall surface of the cylinder. Unlike the one that prevents the fluid from leaking, the inner wall of the diaphragm casing Can of the precision machining and lubrication unnecessary, its manufacturing cost are those of course possible to reduce the maintenance costs or running costs.

(1) In a diaphragm casing A comprising a diaphragm case 10 and a cover 11, a diaphragm body B having a diaphragm stem C is disposed, and an outer peripheral edge thereof is disposed between the flanges 10 ′ and 11 ′ of the case 10 and the cover 11. In the diaphragm actuator that is built by sandwiching between
(2) The diaphragm body B is polymerized by concentrating the diaphragms 15 and 15 'made of elastomer having excellent stretchability and toughness on both surfaces of the diaphragm fixing plate 14, and the diaphragms 15 and 15' are polymerized. A region t extending between the diaphragm case 10 forming the casing A and the flanges 10 ′ and 11 ′ of the cover 11 and the diaphragm pressing plates 16 and 16 is set as an extendable range, and the diaphragm body B is reciprocated. The diaphragms 15 and 15 ′ are expanded and contracted during the movement in the region t and through the gap c between the outer peripheral edge of the diaphragm fixing plate 14 and the inner wall surface of the diaphragm casing A. Diaphragm actuator.

First, a diaphragm actuator according to Embodiment 1 of the present invention will be described with reference to FIGS.
A is a diaphragm casing comprising a diaphragm case 10 and a diaphragm cover 11, B is a diaphragm body, and C is a diaphragm stem.

  Diaphragm body B is stretched in diaphragm casing A by sandwiching its outer peripheral edge (the outer peripheral edge of diaphragms 15 and 15 ′ described later) between flange 10 ′ and 11 ′ of case 10 and cover 11. The air chambers 12 and 13 are airtightly partitioned on both sides.

  Diaphragm stem C is penetrated and fixed to the center of diaphragm body B, and the required length on both sides protrudes outward from case 10 and cover 11 (of course, one end is fixed to diaphragm body B, Only the other may protrude outside the case 10 or the cover 11).

  The diaphragm body B is polymerized by concentrically polymerizing circular diaphragms 15 and 15 'made of an elastomer rich in elasticity and toughness, for example, polyurethane elastomer, on both surfaces of the circular diaphragm fixing plate 14, and further, on both sides thereof. Similarly, the circular diaphragm pressing plates 16 and 16 are superposed and bolted to each other, and a through-hole B ′ for fitting the diaphragm stem C is provided at the center.

  More specifically, first, the diaphragm body B has a diameter, that is, a diameter of the diaphragms 15 and 15 ', which is substantially the same as an outer diameter of the diaphragm casing A including the flanges 10' and 11 '. Yes.

  Second, the diaphragm fixing plate 14 has a diameter slightly smaller than the inner diameter of the diaphragm casing A. More specifically, the dimension is obtained by subtracting the thickness of at least two diaphragms 15 and 15 ′ from the inner diameter of the diaphragm casing A.

  Third, the diameter of the diaphragm pressing plates 16 and 16 is relatively smaller than the diameter of the diaphragms 15 and 15 ', for example, 1/6.

  Fourthly, therefore, the range in which the diaphragms 15 and 15 'can freely expand and contract is a region t extending between the sandwiched portion of the diaphragm casing A by the flanges 10' and 11 'and the diaphragm pressing plates 16 and 16. (Fig. 4)

  The diaphragm body B is stretched in the diaphragm casing A by sandwiching the outer peripheral edge portions of the diaphragms 15 and 15 'between the case 10 and the flanges 10' and 11 'of the cover 11, as described above. In addition, air chambers 12 and 13 are airtightly partitioned on both sides (FIG. 1).

In the state of FIG. 1, when the compressed air is introduced into the air chamber 12 and the compressed air in the air chamber 13 is discharged at the same time, the diaphragm body B moves from the original position to the air chamber 13, and When the compressed air in the air chamber 12 is discharged at the same time, the diaphragm body B moves from the original position to the air chamber 12 side.
In this way, as the diaphragm body B reciprocates, predetermined work is performed by the diaphragm stem C.

  Looking at the behavior of the diaphragms 15 and 15 ′ during the reciprocating motion of the diaphragm body B, when the compressed air is introduced into the air chamber 12 or 13 and the diaphragm body B moves toward the air chamber 13 or 12, the diaphragm 15 , 15 'extend in the direction of movement, and the moved and extended diaphragms 15, 15' contract when returning to the original position.

  Further, the expansion and contraction of the diaphragms 15 and 15 ′ are performed in the range of the region t and through the gap c between the outer peripheral edge of the diaphragm fixing plate 14 and the inner wall surface of the diaphragm casing A.

  As described above, the diaphragms 15 and 15 'of the diaphragm body B of the present embodiment are made of polyurethane elastomer and are rich in elasticity and toughness, and reciprocate by expanding and contracting them, so that they are reinforced with a conventional canvas. Unlike those made of synthetic rubber, it is less likely to deteriorate due to repeated reciprocation, and can be used over a long period of time, so that maintenance costs or running costs can be reduced, which is economical.

In the diaphragm body having the same diameter as the diaphragm body B, a diaphragm 17 for increasing the reciprocating distance, that is, the stroke is shown in FIGS.
As described above, the diaphragm 17 is formed by forming the corrugated portion 18 in a portion corresponding to the side surface of the diaphragm fixing plate 14, that is, the flat surface, within the stretchable region t.
According to this diaphragm 17, the length of expansion and contraction is increased by the amount of the corrugated portion 18, and it is clear that the reciprocating distance, that is, the stroke of the diaphragm body can be increased.

FIG. 7 shows a diaphragm actuator according to a modification of the first embodiment.
In this modified example, the original position of the diaphragm body B is normally biased toward the stroke end on one side. Are the same.
Therefore, in order to avoid duplication, the same portions are denoted by the same reference numerals, and detailed description thereof is omitted.
The return movement to the original position, that is, the stroke end position depends on the restoring force based on the stretchability and toughness of the diaphragms 15 and 15 'itself, but it is apparent that a return spring may be mounted if necessary. It is.

FIG. 8 shows an example in which the diaphragm actuator according to the first embodiment is applied to a so-called ball valve.
That is, a diaphragm actuator similar to that according to the first embodiment is mounted on the main body 19 of the known ball valve D, and the ball valve D is mounted on the lower end of the diaphragm stem C of the diaphragm body B. A valve body 21 for opening and closing the valve port 20 is provided. Since the operation status is recognized as obvious, the description thereof is omitted.

Next, a diaphragm actuator according to Embodiment 2 of the present invention shown in FIG. 9 will be described.
The second embodiment relates to a so-called cylinder valve. In the cylinder valve E, reference numeral 22 denotes a cylindrical valve body having a valve seat 23 on one side, and 24 denotes a cylindrical cap case.
Reference numerals 25 and 26 denote a diaphragm case 25 and a diaphragm cover 26 formed at the opposing ends of the valve body 22 and the cap 24. The case 25 and the cover 26 constitute a diaphragm casing F.

G is a diaphragm body, which has an outer peripheral edge portion (outer peripheral edge portions of diaphragms 30 and 30 'described later) sandwiched between the case 25 and the flanges 25' and 26 'of the cover 26, thereby providing the diaphragm casing F. The air chambers 27 and 28 are airtightly partitioned on both sides.
H is a cylindrical diaphragm stem, which penetrates and adheres to the center of the diaphragm body G, and the required lengths on both sides thereof are inserted into the valve body 22 and the cap case 24.

  The diaphragm body G is polymerized by concentrically polymerizing circular diaphragms 30 and 30 ′ made of an elastomer having excellent elasticity and toughness, for example, polyurethane elastomer, on both surfaces of the circular diaphragm fixing plate 29, and further, on both sides thereof. Similarly, circular diaphragm pressing plates 31 and 31 are superposed and bolted to each other, and a through hole G ′ for fitting the diaphragm stem H is provided at the center. Therefore, it can also be said that the diaphragm body G is an annular body having a through hole G ′ at the center.

The diaphragm body G will be described in further detail as in the diaphragm body B of the first embodiment.
First, the outer diameter of the diaphragm body G, that is, the outer diameter of the diaphragms 30 and 30 'is substantially the same as the outer diameter including the flanges 25' and 26 'of the diaphragm casing F.

  Secondly, the outer diameter of the diaphragm fixing plate 29 is made slightly smaller than the inner diameter of the diaphragm casing F. Specifically, the dimension is obtained by subtracting the thickness of at least two diaphragms 30 and 30 ′ from the inner diameter of the diaphragm casing F.

  Third, the range in which the diaphragms 30 and 30 'can freely expand and contract is a region extending between the sandwiched portion of the diaphragm casing F by the flanges 25' and 26 'and the diaphragm pressing plates 31 and 31. Become.

  The diaphragm body G is stretched in the diaphragm casing F by sandwiching the outer peripheral edge portions of the diaphragms 30 and 30 ′ between the flanges 25 ′ and 26 ′ of the case 25 and the cover 26. The air chambers 27 and 28 are partitioned in an airtight manner.

In FIG. 9, the state in which the diaphragm stem H is separated from the valve seat 23 and opened is shown in the upper half, and the state in which the diaphragm stem H is in contact with the valve seat 23 and closed is shown in the lower half. Yes.
When the compressed air is introduced into the air chamber 28 and the compressed air in the air chamber 27 is discharged at the same time, the diaphragm body G moves from the original position to the air chamber 27 side.
Further, the valve closing state is realized by moving the diaphragm body G from the original position to the air chamber 28 side when the compressed air is introduced into the air chamber 27 and simultaneously the compressed air in the air chamber 28 is discharged.

  The behavior of the diaphragms 30 and 30 ′ during the reciprocating movement of the diaphragm body G is the same as that of the diaphragms 15 and 15 ′ in the first embodiment. Compressed air is introduced into the air chamber 27 or 28, and the diaphragm body G When moving to the chamber 28 or 27 side, the diaphragms 30 and 30 ′ extend in the moving direction, and the moved and extended diaphragms 30 and 30 ′ contract when returning to the original position.

  Further, the expansion and contraction of the diaphragms 30 and 30 ′ may be performed within the above-described region and through the gap between the outer peripheral edge of the diaphragm fixing plate 29 and the inner wall surface of the diaphragm casing F. This is the same as the diaphragms 15 and 15 '.

  Thus, the diaphragms 30 and 30 'of the diaphragm body G of the present embodiment are made of polyurethane elastomer and are rich in elasticity and toughness, and reciprocate by expanding and contracting them. Unlike those made of synthetic rubber, they are less likely to deteriorate due to repeated reciprocation, and can be used over a long period of time, so that manufacturing costs, maintenance costs, running costs, etc. can be reduced, which is economical.

  Further, the diaphragms 30 and 30 'are arranged on the outer periphery of a valve body (diaphragm stem H in this embodiment) that is reciprocally incorporated in a cylinder (diaphragm casing F in this embodiment) as in a conventionally known cylinder valve. It is different from preventing leakage of the fluid while sliding the O-ring fitted on the inner wall surface of the cylinder, and preventing leakage of the fluid while pressing and sliding the inner wall surface of the diaphragm casing F. Not what you want.

  Therefore, the inner wall surface of the diaphragm casing F does not need to be precisely machined or refueled as in the case of the inner wall surface of the cylinder of the above known cylinder valve. Or the running cost can be reduced.

  In the first and second embodiments or the modifications described above, an air pocket generated between the two diaphragms 15, 15 '(or 17, 17), 30, 30' may cause reciprocation of the diaphragm bodies B, G, etc. When it is necessary to avoid the obstacle, the two diaphragms are polymerized through, for example, a companion flange with a vent hole, and sandwiched between the flanges of the diaphragm case and the cover, It is preferable that the air reservoir is configured to be open to the atmosphere.

It is sectional drawing of the diaphragm actuator which concerns on Example 1 of this invention. It is sectional drawing of the state which the diaphragm body of the actuator same as the above moved to one side. It is sectional drawing of the state which the diaphragm body of the actuator same as the above moved to the other side. It is a top view of the diaphragm of an actuator same as the above. It is a top view of the other example of a diaphragm. It is sectional drawing of a diaphragm same as the above. It is sectional drawing of the diaphragm actuator which concerns on the modification of the said Example 1 of this invention. It is sectional drawing of the ball-shaped valve which applied the diaphragm actuator which concerns on the said Example 1 of this invention. It is sectional drawing of the cylinder valve which applied the diaphragm actuator which concerns on Example 2 of this invention. It is sectional drawing of the principal part of a conventionally well-known diaphragm valve.

Explanation of symbols

A, F Diaphragm casing C, H Diaphragm stem B, G Diaphragm body B ', G' Through hole D Ball valve E Cylinder valve c Clearance t Area 10 Diaphragm case 11 Diaphragm cover 10 ', 11' flange 12, 13 Air chamber 14 Diaphragm fixing plate 15, 15 ′ Diaphragm 16, 16 Diaphragm holding plate 17 Diaphragm 18 Wave portion 19 Main body 20 Valve port 21 Valve body 22 Valve body 23 Valve seat 24 Cap case 25 Diaphragm case 26 Diaphragm cover 25 ′, 26 ′ flange 27 , 28 Air chamber 29 Diaphragm fixing plate 30, 30 'Diaphragm 31, 31 Diaphragm holding plate

Claims (7)

In a diaphragm actuator comprising a diaphragm body provided with a diaphragm stem in a diaphragm casing composed of a diaphragm case and the same cover, the inner periphery of which is sandwiched between the case and the flange of the cover.
The diaphragm body is polymerized by concentrating a diaphragm made of elastomer having excellent elasticity and toughness on both surfaces of the diaphragm fixing plate, and the diaphragm is sandwiched between the diaphragm case forming the diaphragm casing and the flange of the cover. The region t extending between the portion and the diaphragm pressing plate is in a range that can be expanded and contracted, and when the diaphragm body reciprocates, the expansion and contraction of the diaphragm is within the range of the region t, and the outer peripheral edge of the diaphragm fixing plate A diaphragm actuator characterized in that the diaphragm actuator is formed through a gap c between the inner wall surface of the diaphragm casing.   2. The diaphragm actuator according to claim 1, wherein the diaphragm of the diaphragm body is made of polyurethane elastomer.   2. The diaphragm body according to claim 1, wherein the gap c is formed by setting the diameter of the diaphragm fixing plate to a size obtained by subtracting the thickness of the two diaphragms from the inner diameter of the diaphragm casing. Or the diaphragm actuator of 2.   The diaphragm actuator according to claim 1, 2 or 3, wherein the diaphragm body has air chambers airtightly partitioned on both sides of the diaphragm.   2. The diaphragm body according to claim 1, wherein a wave-like portion is formed in a portion corresponding to a side surface of the diaphragm fixing plate, that is, a flat surface, within the expansion region t of the diaphragm. 2, 3 or 4 diaphragm actuator.   A ball valve comprising the diaphragm actuator according to claim 1, 2, 3, 4 or 5.   A cylinder valve comprising the diaphragm actuator according to claim 1, 2, 3, 4 or 5.

Images