JP3040299B2 - Ripple type diaphragm accumulator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to relates to a diaphragm-type Accu <br/> Murray data.

[0002]

2. Description of the Related Art In a conventional diaphragm-type accumulator, for example, an elastic surface 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 a mounting member, the internal space of the diaphragm is partitioned into a gas chamber and a liquid chamber. By forming a projecting portion inward on the inner peripheral surface of the main body at the same distance from the elastic mounting portion, at least the inner inflection point and the outer inflection point of the curved reversal portion of the elastic material layer of the diaphragm are formed. 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 at at least the inner inflection point among the inner inflection point and the outer inflection point of the curved inversion portion of the diaphragm is increased. It is known that the buckling of the elastic material layer is suppressed by approaching the breaking stress. (For example, see Japanese Utility Model Laid-Open No. 4-101801)

In a conventional diaphragm accumulator, when the pressure in the liquid chamber decreases and the diaphragm moves along the protrusion toward the protrusion of the liquid chamber,
The diaphragm deforms regularly while contacting the inner surface of the main 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 deforms irregularly. Irregular deformations include, for example, a local reversal of the bending direction of the moving diaphragm. A local reversal of the bending direction is a reversal from a convex to a concave at a local part of the diaphragm or vice versa when the diaphragm is moving generally in the direction of the gas or liquid chamber.

[0004]

The diaphragm of the conventional diaphragm type accumulator having a spherical body is as follows.
Irregular deformation of the diaphragm, in particular, local reversal of the bending direction of the diaphragm occurs, and repeated reversal of the local bending direction causes the reversal part to fatigue, the strength of the reversal part to be reduced early, and fracture. Easier to do. The present invention relates to a ripple-shaped diaphragm type accumulator of the type in which a diaphragm is sandwiched between two containers having a substantially bowl-shaped recess.
In the murator , the deformation of the diaphragm is restrained to make it regular, the fatigue caused by local reversal of the bending direction during the movement of the diaphragm is reduced, the durability of the diaphragm is increased, the life is prolonged, and the diaphragm is made of a diaphragm container. An object of the present invention is to reduce fatigue caused by local reversal of the bending direction of the diaphragm when it comes into contact with any one of the two wall surfaces, increase the durability of the diaphragm, and prolong the service life.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a ripple type diaphragm accumulator having a substantially circular flat plate at the center and a substantially concentric circular outer periphery. A corrugated diaphragm in which convex portions and concave portions are formed alternately and continuously is formed on the outer periphery of the substantially bowl-shaped concave portion of the two containers.
Recessed in one of the containers
And a gas chamber is formed between the diaphragm and
Fluid chamber between the recess of the other container and the diaphragm
Is formed, gas is sealed in the gas chamber, and the fluid
The chamber communicates with the outside, and an external fluid is introduced into the fluid chamber.
The shape of one wall of the recess of the container is
The technical means is that it is formed in a smooth shape that does not match the diaphragm, and the other wall shape of the concave portion of the container is formed in a ripple shape opposite to the elongated diaphragm.

[0006]

[Action] diaphragms of the present invention, the central portion is a substantially circular flat plate, since substantially concentric convex and concave portions on its outer periphery are formed alternately and continuously, one of the concave plant as a whole diaphragm When moving in the direction of, the convex portion and the concave portion formed substantially concentrically do not change the bending direction, the convex portion always maintains the shape of the convex portion, and the concave portion also has the same shape. maintain. And the ripple type diaphragm accumulator of the present invention has two diaphragms .
In the annular holding part formed on the outer periphery of the substantially bowl-shaped recess of the container
Therefore , when the diaphragm is extended to the other side
Only one of the concave portions of the container opposed thereto is formed to have substantially the same shape, so that the convex portion and the concave portion of the diaphragm fit exactly into the opposing portion of one of the concave portions while maintaining that shape.

[0007]

1 and 2 show an embodiment of a ripple type diaphragm accumulator according to the present invention. Ripples shaped diaphragm 1 is a substantially circular plate shape as a whole, the central portion 2 Yes is a substantially circular flat plate shape, protrusions 3 and recesses 4 of substantially concentric (annular) on its outer periphery is continuously alternately It is 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 are variously deformed by experiments. As a material of the diaphragm, a tetrafluoroethylene resin having excellent chemical resistance (trade name: Teflon) is used, and a 0.3 mm or 0.5 mm tetrafluoroethylene resin plate is processed and used.

[0008] The diaphragm type accumulator has a body 6
And a side plate 7, and a recess 8 (on the side of the body 6) and a recess 10 (on the side of the side plate 7) are formed on the facing surface of the main body 6 and the side plate 7.
An annular holding portion 67 (on the main body 6 side) and a holding portion 68
(Side plate 7 side) is formed. The holding part 67 has the first
An annular groove 17 is formed, and a second annular groove 18 is formed at a position of the holding portion 67 facing the first annular groove 17. The first annular groove 17 and the second annular groove 18 have the first sealing material 11 and the second annular groove 18. The two seal materials 12 are fitted respectively. The outer periphery of the rippled diaphragm 1 is held by holding portions 67 and 68, a plurality of bolts 22 are inserted into a plurality of bolt holes 19 and 20 formed in the main body 6 and the side plate 7, and a plurality of nuts are inserted into the plurality of bolts 22. 23 is screwed.
In this way, the outer peripheral portion of the diaphragm 1 is held by the holding portions 67 and 68, and the upper and lower spaces (the recess 8 and the recess 10) of the diaphragm 1 are held by the first seal material 11 and the second seal material 12.
The space is sealed. The space between the recess 10 of the side plate 7 and the diaphragm 1 is a gas chamber 13, and gas is sealed 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. The diaphragm type accumulator is used for absorbing pulsation of fluid, absorbing surge pressure, and the like. For example, when spraying a coating liquid, it is used for absorbing the pulsation and keeping the pressure of the coating liquid constant.

The ripple-shaped diaphragm 1 is provided in a liquid chamber.
It moves to the gas chamber 13 side or the fluid chamber 14 side in accordance with the pressure fluctuation in the 14 and contacts the recess 8, but it is assumed that there is no possibility of contacting the recess 10. Due to such a premise, the wall shape of the recess 8 is a shape that matches the deformed shape when the rippled diaphragm 1 is pressed against and contacts the wall, whereas the wall shape of the recess 10 is shown in FIG.
As shown in FIG. 5, the shape is not a shape conforming to the deformed shape when the diaphragm 1 is pressed against and contacts the wall surface. In response to 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 side 14, and due to the movement of the diaphragm 1, the diaphragm 1 comes into contact with the recess 8 but does not contact the recess 10. The contact point on the surface of the recess 8 with which the ripple-shaped diaphragm 1 comes into contact is the extended diaphragm 1
The symmetrical shape corresponding to the opposed portion of the convex portion and the concave portion such as the substantially concentric convex portion 3 and the concave portion 4, and the substantially concentric concave portion 82,
The convex portions such as the convex portions 81 and the concave portions are alternately and continuously formed. For example, the diaphragm 1 extends to the fluid chamber 14 side,
When the diaphragm 1 comes into full contact with the surface of the concave portion 8, the convex portions such as the substantially concentric convex portion 3 and the concave portion 4 of the diaphragm 1 and the back surface of the concave portion have concave portions 82 formed in the concave portion 10.
It is formed so as to be in close contact with and fitted to the concave and convex portions such as the convex portion 81, respectively.

FIG. 2 shows a diaphragm in which the recesses 8 and the recesses 10 are deeper than those shown in FIG. 1, and the height and depth of the projections and recesses of the rippled diaphragm 1 are large and the number of projections and depressions is small. The figure shows the results obtained by changing the pressure of the fluid chamber 14 by experiment and measuring the position of the rippled diaphragm 1 at that time for the expression accumulator. In FIG.
When the pressure in the fluid chamber 14 is increased in a normal use state, the pressure increases to the position A, and rarely moves to the positions F and G.
No further rise is expected. Next, when the pressure in the fluid chamber 14 is decreased, the diaphragm 1 extends toward the fluid chamber 14 and moves from position A to position B, position C, and position D, and finally the diaphragm 1 is moved into the recess 8. It reaches the position E where it comes into full contact. When the diaphragm 1 moves, its deformation is restrained by the elasticity and rigidity of the diaphragm 1 and the substantially concentric convex and concave portions formed alternately and continuously, and the diaphragm 1 is shown in FIG. As described above, the elastic member expands and contracts regularly, and no local reversal of the bending direction occurs.

[0011] FIG. 3 is a main part of a reference example of applying the container wave crest-shaped diaphragm to the diaphragm valve is shown.
Ripples shaped diaphragm 1 used in the da Iyafuramu valve,
Is a metal, the shape is similar to that used in the actual施例. As shown in FIG. 3, the da Iyafuramu valve, the valve body
There is a recess 70 (valve case 70 side) and a recess 73 (valve cover 71 side) on the facing surface of the valve box 70 and the valve cover 71. Recess
A metal rippled diaphragm 1 is arranged between the recess 72 and the recess 73. Then, as in the case of actual施例, wall shape of the recess 73, a deformed shape (generally a diaphragm 1 when the diaphragm 1 by the elastic force of the metallic ripples shaped diaphragm 1 is in contact pressed against the the wall The shape conforms to the same ripple shape. A cylinder hole 65 is opened at the center of the recess 73, and a piston 66 having a valve stem function is slidably fitted in the cylinder hole 65. On the other hand, an inflow passage 77 is opened at the center of the recess 72, and an annular valve seat 78 is protruded from the outer periphery of the opening of the inflow passage 77.
An annular depression 80 is formed on the outer periphery of the valve seat 78, and the depression 80
The outflow passage 79 is open. A part of the valve seat 78 is formed in a ripple shape facing the elongated 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 contacts 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 first chamber 76 on the recess 72 side and the second chamber 76 on the recess 73 side are clamped by the diaphragm 1.
It is divided into a room. The valve seat 78 is set to be 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 of 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. I do. When the piston 66 is moved in the direction of the valve seat 78, the distal end 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 in the direction of the valve seat 78, the central portion 2 of the diaphragm 1 is pressed by 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 cover 71 (upward in FIG. 3), the diaphragm 1 moves in the direction of the valve cover 71 due to its own elastic force and the force of the fluid acting on the first chamber 76 side of the diaphragm 1. Go to In accordance with the movement of the diaphragm 1, the flow rate of the fluid passing through the first chamber 76 increases, and the movement of the diaphragm 1 causes the diaphragm 1 to move.
Comes into contact with the recess 73. The contact portion of the surface of the concave portion 73 with which the diaphragm 1 comes into contact has a symmetrical shape corresponding to the opposed portion such as the substantially concentric convex portion or concave portion of the elongated rippled diaphragm 1, and the concave portion or 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 concave portion 73, the substantially concentric convex portion and concave portion of the diaphragm 1 are replaced by the concave portion formed in the concave portion 73. , Projections, etc., so as to be in close contact with, fit with, and match with each other.

[0013] Figure 4 is a partially enlarged view of a diaphragm 1 used in the real施例. The diaphragm 1 has an elastic material layer 61 made of an elastic material such as rubber, and a gas blocking layer 62 provided inside or on one side of the elastic material layer 61. The gas blocking layer 62 is formed on at least one surface of a reinforcing material such as a woven fabric or a non-woven fabric, by a resin film having low gas permeability made of polyvinyl alcohol resin, polyvinyl fuchsia vinyl resin, vinylidene chloride resin or the like, or a gas shielding film made of metal foil. Are formed by adhering. However, the reinforcing material is omitted, and the gas shielding layer 62 is formed by at least one gas shielding film.
Can be formed. The diameter of the gas blocking layer 62 is smaller than the diameter of the elastic material layer 61, and the diaphragm at the outer peripheral portion of the gas blocking layer 62 is constituted only by 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 thereof, 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,
Even if the gas that has entered the elastic material layer 61 on the gas chamber side from the gas chamber reaches the gas blocking layer 62 and moves along the surface of the gas blocking layer 62 to the peripheral portion, the gas flows along the surface by the bonding portion 63. Movement is blocked. In order for the gas reaching the bonding portion 63 to leak, the elastic material layer 61 on the gas chamber side is required.
And between the molecules of the elastic material layer 61 on the outer periphery of the gas barrier layer 62, the amount of such gas passing is extremely small.

[0014]

The diaphragm of the present invention has a substantially circular flat plate at the center portion, and has substantially concentric convex portions and concave portions formed alternately and continuously on the outer periphery thereof . Due to such a shape, elasticity and rigidity of the diaphragm, the deformation of the diaphragm is restrained, and when the diaphragm is moved in the direction of the gas chamber or the liquid chamber as a whole, the convex portions and the concave portions formed substantially concentrically are bent. It does not change (curvature) direction. Therefore, the moving diaphragm deforms regularly,
There is no local reversal of the bending direction during movement of the diaphragm, and the durability of the diaphragm is high and the life is long. Further, the ripple type diaphragm accumulator of the present invention,
An annular pinch formed around the outer periphery of the substantially bowl-shaped recess of the two containers
The wall of one of the recesses of the container,
Smooth shape whose shape does not match the elongated diaphragm
And the other wall shape of the recess of the container was formed in a ripple shape opposite to the elongated diaphragm . Obedience
Thus, when the diaphragm extends to the other recess, the substantially concentric convex and concave portions of the diaphragm maintain their shapes. At that time, 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 , and as described later, the diaphragm is in one position.
Diaphragm touches the wall when extended to one of the recesses
No, the diaphragm has high durability and long life. Also, between the recess of one container and the diaphragm
A gas chamber is formed in the recess of the other container and the
A fluid chamber is formed between the gas chamber and the diaphragm.
Is filled with gas, the fluid chamber communicates with the outside,
External fluid was introduced into the body chamber. Therefore, gas is always sealed.
In the gas chamber that has been
Because the extended diaphragm does not touch,
Even with a smooth shape that does not match the
Ripple shape without affecting the life of the diaphragm
Processing costs can be saved.

[Brief description of the drawings]

1 is a diagram showing a cross-section of the actual施例of the present invention.

Shows an experiment result of the actual施例of the invention; FIG.

FIG. 3 is a diagram showing a cross section of a main part of a reference example of the present invention.

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

[Explanation of symbols]

 DESCRIPTION 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 Recessed part 73 Recessed part 81 Convex part 82 Recessed part

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F16J 3/02 F15B 1/08 F16L 55/04

Claims (1)

(57) [Claims] 1. A corrugated diaphragm having a substantially circular flat plate at the center portion and a substantially concentric convex portion and a concave portion formed alternately and continuously on an outer periphery thereof , the outer periphery of a substantially bowl-shaped concave portion of two containers. To
One container is clamped by the formed annular clamping portion
A gas chamber is formed between the recess and the diaphragm
Between the recess of the other container and the diaphragm
A fluid chamber is formed, gas is sealed in the gas chamber,
The fluid chamber communicates with the outside and an external fluid is introduced into the fluid chamber.
And the wall shape of one of the recesses of the container is elongated.
A ripple-shaped diaphragm formed in a smooth shape that does not match the diaphragm, and the other wall shape of the recess of the container is formed in a ripple shape opposite to the elongated diaphragm.
Expression accumulator.