JPH07167299A - Vessel for wave pattern type diaphragm - Google Patents

Abstract

PURPOSE:To lessen fatigue of a diaphragm due to the reversal and enhance durability for the wave-pattern-type diaphragm used for an accumulator or the like by forming the shape of a wall surface on one side of recessed parts of the vessel into a wave- pattern-form facing the elongated diaphragm. CONSTITUTION:In a wave-pattern-type diaphragm 1, the central part 2 is of nearly a circular and flat plate shape, while the peripheral part is formed into a circular, wave-pattern shape in which almost concentric and circular projecting part 3 and recessed part 4 continue alternately. The diaphragm 1 is held between holding parts 67 and 68 situating outside a main body 6 and a side plate 7 of an accumulator, in which recessed places 8, 10 are formed facing to each other, in such a manner that the peripheral part of the diaphragm 1 is held between the holding parts 67 and 68. A gas chamber 13 is partitioned/formed between the recessed part 10 of the side plate 7 and the diaphragm 1, while a fluid chamber 14 is partitioned/formed between the recessed part 8 of the main body 6 and the diaphragm 1, respectively. In this case, the shape of the wall surface of the recessed place 8 is formed into a shape coinciding with the deformed shape of the diaphragm 1, which is obtained when the diaphragm 1 is pushed against the recessed place 8 to be brought in contact with each other, thereby lessening the fatigue due to reversal of the diaphragm 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ripple type diaphragm container used for diaphragm type accumulators, diaphragm pumps, diaphragm valves and the like.

[0002]

2. Description of the Related Art In a conventional diaphragm type accumulator, for example, an elastic member formed on an inner peripheral surface of a peripheral portion of a diaphragm (bladder) is brought into contact with an inner peripheral surface of a spherical body (shell). By fixing the mounting portion with the mounting member, the inner space of the diaphragm is partitioned into a gas chamber and a liquid chamber. Then, by forming an inward protruding portion on the inner peripheral surface of the main body at the same distance from the elastic attachment portion, at least the inner side of the inner side inflection point and the outer side inflection point of the curved reversal portion of the elastic material layer of the diaphragm The distance between the inflection point and the inner peripheral surface of the main body is reduced, and the buckling stress of the elastic material layer is increased at least at the inner inflection point of the inner and outer inflection points of the curved reversal part of the diaphragm. It is known to suppress the occurrence of buckling in the elastic material layer by bringing the elastic material layer closer to the breaking stress. (See, for example, Japanese Utility Model Publication No. 4-101801)

In the conventional diaphragm type accumulator, when the pressure of the liquid chamber is lowered and the diaphragm moves toward the protrusion of the liquid chamber and moves along the protrusion,
The diaphragm deforms regularly while contacting the inner surface of the body. However, after the diaphragm moves past the protrusion, the diaphragm deforms irregularly. Further, when the pressure of the liquid chamber increases and the diaphragm moves toward the gas chamber, the diaphragm does not contact the main body and is deformed irregularly. The irregular deformation is, for example, a local reversal of the bending direction of the moving diaphragm. Local reversal of the bending direction is the reversal of the diaphragm from convex to concave at the local part of the diaphragm or vice versa when the diaphragm is moving in the direction of the gas or liquid chamber as a whole.

[0004]

A diaphragm of a conventional diaphragm type accumulator having a spherical body is
The above-mentioned irregular deformation of the diaphragm, especially the local reversal of the bending direction of the diaphragm occurs, and the repeated reversal of the bending direction causes fatigue at the reversal point, and the strength of the reversal point is reduced early, causing damage. Easier to do. The present invention is a diaphragm container of a type in which a diaphragm is sandwiched by two containers having a substantially bowl-shaped recess,
An object of the present invention is to restrain the deformation of the diaphragm to make it regular, reduce fatigue due to local reversal of the bending direction during movement of the diaphragm, improve the durability of the diaphragm, and prolong the life of the diaphragm. Further, the present invention is applied to a diaphragm container such as a diaphragm type accumulator, a diaphragm pump, a diaphragm valve, etc., and the diaphragm of the diaphragm when the diaphragm comes into contact with any one of the two wall surfaces of the diaphragm container. It is an object to reduce fatigue caused by locally reversing the bending direction, improve the durability of the diaphragm, and prolong the life of the diaphragm.

[0005]

In order to solve the above-mentioned problems, the present invention provides a container for a rippled diaphragm in which a central portion is a substantially circular flat plate shape and a substantially concentric convex portion and a concave portion are alternately continuous. It is technical that the corrugated diaphragm formed by being sandwiched between two containers having a substantially bowl-shaped recess, and one wall shape of the recess of the container is formed in a ripple shape opposite to the elongated diaphragm. Use it as a means. Further, the present invention, one wall surface shape of the recess of the container is a symmetrical shape corresponding to the substantially concentric convex portion and the facing portion of the concave portion of the expanded diaphragm, or one wall surface shape of the recess is The technical means is that it is formed in a ripple shape opposite to the stretched diaphragm, and the other one portion is formed in a symmetrical shape. The ripple-shaped diaphragm container refers to a member having a substantially bowl-shaped recess and capable of sandwiching the ripple-shaped diaphragm, and the term "substantially bowl-shaped" means any shape of depression. The central portion includes a hole having attachment holes formed therein for attaching various members. The substantially circular flat plate shape means a shape that is substantially circular and is substantially flat (including a shape that is deformed such as curved after manufacturing). The material of the diaphragm can be synthetic resin (for example, tetrafluoroethylene resin (trade name is Teflon), rubber), metal (for example, copper, stainless steel), or the like.

[0006]

In the diaphragm of the present invention, the central portion is formed into a substantially circular flat plate shape, and the concentric circular convex portions and concave portions are alternately formed continuously. Therefore, the diaphragm as a whole has one concave portion or the other concave portion. When moving in the direction of the recess, the convex portion and the concave portion formed in a substantially concentric shape do not change the bending direction, and the convex portion always maintains the shape of the convex portion, and the concave portion also has the same shape. Maintain shape. And, the corrugated container for the ripple-shaped diaphragm of the present invention, the diaphragm is sandwiched by two containers having a substantially bowl-shaped recess, and when the diaphragm is extended, one of the recesses of the container facing it is substantially Since the diaphragms are formed in the same shape, the convex portions and the concave portions of the diaphragm maintain their shapes, and are fitted closely to the facing portions of the one concave portion.

[0007]

1 and 2, there is shown a first embodiment in which the ripple-shaped diaphragm container of the present invention is applied to a diaphragm type accumulator. The ripple-shaped diaphragm 1 has a substantially circular plate shape as a whole, the central portion 2 has a substantially circular flat plate shape, and a substantially concentric (ring-shaped) convex portion 3 is provided on the outer periphery thereof.
And the concave portions 4 are alternately and continuously formed in a circular wave shape. The shapes of the convex portion 3 and the concave portion 4 are curves based on a sine wave, but they are variously modified by experiments. As the material of the diaphragm, here we use tetrafluoroethylene resin (trade name: Teflon), which has excellent chemical resistance, and is 0.3 mm or 0.5 mm.
It is used by processing a four-ply ethylene resin plate.

The diaphragm type accumulator has a main body 6
And a side plate 7, and a recess 8 (on the side of the main body 6) and a recess 10 (on the side plate 7 side) are formed in the facing surfaces of the body 6 and the side plate 7.
On the outside thereof, a ring-shaped holding portion 67 (on the side of the main body 6) and a holding portion 68.
(Side plate 7 side) is formed. First in the clamping section 67
An annular groove 17 is formed, a second annular groove 18 is formed at a position facing the first annular groove 17 of the holding portion 67, and the first sealing material 11 and the first annular material 17 are provided in the first annular groove 17 and the second annular groove 18, respectively. Two sealing materials 12 are fitted together. The outer peripheral portion of the rippled diaphragm 1 is sandwiched by the sandwiching portions 67 and 68, the bolts 22 are inserted into the bolt holes 19 and 20 formed in the body 6 and the side plate 7, and the nuts are attached to the bolts 22. 23 is screwed in.
In this way, the outer peripheral portion of the diaphragm 1 is sandwiched by the sandwiching portions 67, 68, and the upper and lower spaces (recesses 8 and 10) of the diaphragm 1 are sandwiched by the first seal material 11 and the second seal material 12.
The space between them is sealed. A space between the recess 10 of the side plate 7 and the diaphragm 1 is a gas chamber 13, and gas is filled in the gas chamber 13 through an air supply port 27 connected to a connection port 28 of the side plate 7. Similarly, the space between the recess 8 of the main body 6 and the diaphragm 1 is a fluid chamber 14, and the fluid chamber 14 has a supply / discharge port 2 of the main body 6.
5. External fluid is introduced through the connection port 26. This diaphragm type accumulator is used for absorbing pulsation of fluid, absorbing surge pressure, etc., for example, when spraying the coating liquid, it is used for absorbing the pulsation and keeping the pressure of the coating liquid constant.

The ripple-shaped diaphragm 1 is a liquid chamber.
It is premised that there is no possibility of contacting the recess 8 while contacting the recess 8 by moving to the gas chamber 13 side or the fluid chamber 14 side in accordance with the pressure fluctuation inside 14. Because of this premise, the wall shape of the recess 8 matches the deformed shape when the rippled diaphragm 1 is pressed against and comes into contact with this wall surface, while the wall shape of the recess 10 is shown in FIG.
As shown in (4), the shape is a smooth curved surface and does not match the deformed shape when the diaphragm 1 is pressed against and comes into contact with this wall surface. Depending on the pressure fluctuation in the fluid chamber 14, the diaphragm 1 is slightly moved to the gas chamber 13 side, and
The diaphragm 1 largely moves to the 14 side, and due to the movement of the diaphragm 1, the diaphragm 1 contacts the recess 8 but does not contact the recess 10. The contact portion on the surface of the recess 8 with which the rippled diaphragm 1 contacts is the expanded diaphragm 1
A substantially concentric circular concave portion 82 having a symmetrical shape corresponding to the concentric circular convex portion 3, concave portion 4 and other convex and concave portions facing each other,
The convex portions such as the convex portion 81 and the concave portions are alternately continuous. For example, the diaphragm 1 extends toward the fluid chamber 14 side,
When the diaphragm 1 is entirely in contact with the surface of the recess 8, the back surface of the convex portion and the concave portion such as the substantially concentric convex portion 3 and the concave portion 4 of the diaphragm 1 is a concave portion 82 formed in the concave portion 10.
The concave portions and the convex portions such as the convex portion 81 are formed so as to come into close contact with each other and fit.

FIG. 2 is a diaphragm in which the recesses 8 and 10 are deeper than those shown in FIG. 1, and the height and depth of the projections and recesses of the ripple-shaped diaphragm 1 are large and the number of irregularities is small. The result of measuring the position of the rippled diaphragm 1 at that time by changing the pressure of the fluid chamber 14 by an experiment is shown for the accumulator. In FIG.
When the pressure of the fluid chamber 14 is raised in a normal use state, the pressure rises to the position A and rarely moves to the positions F and G.
No further rise is planned. Next, when the pressure in the fluid chamber 14 is lowered, the diaphragm 1 extends toward the fluid chamber 14 side, and sequentially moves from position A to position B, position C, and position D, and finally the diaphragm 1 becomes a recess 8. It reaches the position E where it makes full contact. When the diaphragm 1 moves, its deformation is restrained by the elasticity and rigidity of the diaphragm 1 and the fact that the substantially concentric circular convex portions and concave portions are alternately formed continuously, and the diaphragm 1 is shown in FIG. As described above, it expands and contracts regularly, and no local reversal of the bending direction occurs.

FIG. 3 shows an essential part of a second embodiment in which the ripple-shaped diaphragm container of the present invention is applied to a diaphragm valve. The ripple-shaped diaphragm 1 used in the diaphragm valve of the second embodiment is made of metal, but has the first shape.
It is similar to that used in the examples. As shown in FIG. 3, the diaphragm valve of the second embodiment of the present invention includes a valve box 70.
And the valve lid 71, and there is a recess on the surface facing the valve box 70 and the valve lid 71.
There are 72 (valve box 70 side) and recess 73 (valve lid 71 side). Recess 72
The metal rippled diaphragm 1 is disposed between the groove 73 and the recess 73. As in the case of the first embodiment, the wall shape of the recess 73 is a deformed shape (generally the diaphragm 1 when the diaphragm 1 is pressed against and brought into contact with the wall surface by the elastic force of the metal rippled diaphragm 1). The same shape as the ripple pattern). A cylinder hole 65 is opened in the center of the recess 73, and a piston 66 having a valve rod function is slidably fitted in the cylinder hole 65. On the other hand, an inflow passage 77 is opened in the central portion of the recess 72, and an annular valve seat 78 is projectingly provided on the outer peripheral portion of the opening of the inflow passage 77.
An annular recess 80 is formed on the outer periphery of the valve seat 78.
The outflow passage 79 is open at. Then, a part of the valve seat 78 is formed in a ripple shape facing the stretched diaphragm 1. However, the wall shape of the recess 72 does not match the deformed shape when the rippled diaphragm 1 is pressed against and comes into contact with this wall surface. The outer peripheral portion of the diaphragm 1 is clamped by the clamping portion 74 and the diaphragm retainer 75, and the diaphragm 1 causes the first chamber 76 on the side of the recess 72 and the second chamber on the side of the recess 73.
It is divided into a room and a room. The valve seat 78 is set larger than the diameter of the piston 66.

FIG. 3 shows a state where the rippled diaphragm 1 is pressed against the wall surface of the recess 73 by the elastic force of the rippled metal diaphragm 1. At this time, since the diaphragm 1 is at the fully open position farthest from the valve seat 78, the maximum amount of fluid flows out from the inflow passage 77 through the gap between the valve seat 78 and the diaphragm 1, the first chamber 76, and the outflow passage 79. To do. When the piston 66 is moved toward the valve seat 78, the tip of the piston 66 presses the central portion 2 of the diaphragm 1, the diaphragm 1 approaches the valve seat 78, and the gap between the valve seat 78 and the diaphragm 1 decreases. , The flow rate of fluid through the first chamber 76 is reduced. When the piston 66 is further moved toward the valve seat 78, the central portion 2 of the diaphragm 1 is pressed against the valve seat 78, and the flow rate of the fluid passing through the first chamber 76 becomes zero. At this time, a part of the expanded diaphragm 1 comes into close contact with the valve seat 78. When the piston 66 is moved in the direction of the valve lid 71 (upward in FIG. 3), the diaphragm 1 moves in the direction of the valve lid 71 due to its own elastic force and the force of the fluid acting on the first chamber 76 side of the diaphragm 1. Move to. The flow rate of the fluid passing through the first chamber 76 increases in accordance with the movement of the diaphragm 1, and the movement of the diaphragm 1 causes the diaphragm 1 to move.
Comes into contact with the recess 73. The contact portion on the surface of the recess 73 with which the diaphragm 1 contacts has a symmetrical shape corresponding to the substantially concentric convex portion, the concave portion, or the like of the elongated ripple-shaped diaphragm 1, and the concave portion and the convex portion of the ripple. The parts and the like are alternately and continuously formed. When the diaphragm 1 moves to the valve lid 71 side and the diaphragm 1 comes into full contact with the surface of the recess 73, the substantially concentric projections and recesses of the diaphragm 1 are recesses formed in the recess 73. , Convex portions, etc. are formed so as to be in close contact with each other, to be fitted and matched.

FIG. 4 is a partially enlarged view of the diaphragm 1 used in the first embodiment. The diaphragm 1 includes an elastic material layer 61 made of an elastic material such as rubber and an elastic material layer 6
1 has a gas barrier layer 62 disposed inside or on one side. The gas blocking layer 62 is a gas blocking film made of a resin film or a metal foil having a low gas permeability made of polyvinyl alcohol resin, polyfucca vinyl resin, vinylidene chloride resin or the like on at least one surface of a reinforcing material such as woven cloth or nonwoven cloth. Are formed by bonding. However, it is possible to omit the reinforcing material and form the gas blocking layer 62 with at least one layer of the gas blocking film. The diameter of the gas blocking layer 62 is smaller than the diameter of the elastic material layer 61, and the diaphragm on the outer peripheral portion of the gas blocking layer 62 is composed of only the elastic material layer 61. The gas blocking layer 62 is adhered to the elastic material layer 61 by the adhesive portions 63 on both sides of the peripheral edge portion, and is entirely adhered to the elastic material layer 61 on the fluid chamber side. When the diaphragm shown in FIG. 4 is applied to a ripple-shaped diaphragm container, the gas that has penetrated from the gas chamber into the elastic material layer 61 on the gas chamber side reaches the gas barrier layer 62 and then the gas barrier layer 62.
Even if it moves along the surface to the peripheral portion, the adhesion portion 63 prevents the movement along the surface. In order for the gas reaching the adhesive portion 63 to leak, the elastic material layer 6 on the gas chamber side is leaked.
1 and the elastic material layer 61 on the outer periphery of the gas blocking layer 62
It is necessary to pass between the molecules of, and the amount of such gas passing is extremely small.

[0014]

In the diaphragm of the present invention, the central portion is formed into a substantially circular flat plate shape, and the substantially concentric circular convex portions and concave portions are continuously formed. Due to the shape, elasticity and rigidity of the diaphragm, the deformation of the diaphragm is restrained,
When the diaphragm is moving in the direction of the gas chamber or the liquid chamber as a whole, the convex portion and the concave portion formed in a substantially concentric shape do not change the bending (curving) direction. Therefore, the moving diaphragm is regularly deformed, and there is no local reversal of the bending direction during moving of the diaphragm.
The diaphragm has high durability and long life. Further, in the corrugated container for rippled diaphragm of the present invention, the diaphragm is sandwiched by two containers having a substantially bowl-shaped recess, and one wall shape of the recess of the container is opposed to the elongated diaphragm. Since it is formed in a ripple shape, when the diaphragm extends to one of the recesses, the substantially concentric convex and concave portions of the diaphragm maintain the shape and fit snugly to the facing portion of the one recess. To do. Therefore, when the diaphragm comes into contact with the wall surface of the diaphragm device, there is no local reversal of the bending direction of the diaphragm, the durability of the diaphragm is high, and the life is long. Also, one wall shape of the recess is formed in a ripple shape that faces the expanded diaphragm, and another part of the wall shape is formed in a ripple shape that faces the expanded diaphragm, and the same effect as described above can be obtained. You can

[Brief description of drawings]

FIG. 1 is a diagram showing a cross section of a first embodiment of the present invention.

FIG. 2 is a diagram showing an experimental result of the first embodiment of the present invention.

FIG. 3 is a diagram showing a cross section of a main part of a second embodiment of the present invention.

FIG. 4 is a partial cross-sectional view of a diaphragm used in the first embodiment of the present invention.

[Explanation of symbols]

 1 diaphragm 2 central part 3 convex part 4 concave part 6 main body 7 side plate 8 concave part 9 concave part 70 valve box 71 valve lid 72 concave part 73 concave part 81 convex part 82 concave part

Claims (2)

[Claims] 1. A corrugated diaphragm having a substantially circular flat plate-shaped central portion and alternating concentric circular convex portions and concave portions is sandwiched between two containers each having a substantially bowl-shaped recess, A container for a ripple-shaped diaphragm in which one wall surface shape of the recess of the container is formed in a ripple shape facing the expanded diaphragm. 2. A corrugated diaphragm having a substantially circular flat plate-shaped central portion and alternating concentric circular convex portions and concave portions is sandwiched between two containers each having a substantially bowl-shaped recess. A container for a ripple-shaped diaphragm, wherein one wall shape of the recess of the container is formed into a ripple shape facing the expanded diaphragm, and another part of the recess shape is formed into a ripple shape opposite to the expanded diaphragm.