JP2004301323A - Diaphragm valve element - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily and firmly install these parts in a hard resin holding member when constituting a thin flexible part and a thick closing part as a separate body in a diaphragm valve element having the plate-like closing part in a central part for cutting off a passage by being seated on a valve seat, and having the thin flexible part on the periphery. <P>SOLUTION: This diaphragm valve element 10 comprises a diaphragm body 12 having the plate-like closing part 18 of the central part for cutting off the passage 26 by being seated on the valve seat 24, a fixing part 16 of an outer peripheral part, and the thin flexible part 20, and a hard resin holding member 14 for holding a shape of the closing part 18 in a plate shape. The closing part 18 and the flexible part 20 are constituted as a separated body. The holding member 14 is dividedly constituted as a first sandwiching member 46 and a second sandwiching member 48, and these members are mutually ultrasonically welded in a state of mutually sandwiching an outer peripheral part of the closing part 18 and an inner peripheral part of the flexible part 20 from opposite both surfaces. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a diaphragm valve used for a water stop valve or the like.

  Conventionally, a flat plate-shaped closing portion that sits on a valve seat to block a passage, a fixed portion at an outer peripheral portion, and a thin flexible portion between the closed portion and the fixed portion, A diaphragm body made of an elastic body, which displaces the closing portion in the axial direction based on the flexible deformation of the flexible portion, moves rigidly with the closing portion and holds the closing portion in a flat plate shape. 2. Description of the Related Art A diaphragm valve body having a resin holding member assembled thereto is widely used in various fields.

FIG. 15 shows an example.
In the figure, reference numeral 200 denotes a diaphragm valve body which is a main component of a water stop valve 202, and has a diaphragm main body 204 made of an elastic body such as rubber.
The diaphragm main body 204 has a fixed portion 206 at an outer peripheral portion and a plate-shaped closing portion 208 at a central portion, and a valve seat 209 at an upper end of a cylindrical portion forming a part of the passage 210 at the closing portion 208. , And shuts off the passage 210.

  A resin holding member 214 made of a resin harder than the diaphragm main body 204 is attached to the diaphragm main body 204 so as to move integrally with the closing portion 208 and hold the closing portion 208 in a flat plate shape. And the diaphragm main body 204 constitute a diaphragm valve body 200.

In the diaphragm valve element 200, a flexible portion 216 having an upwardly folded shape is formed between the fixed portion 206 and the closing portion 208. The closing portion is formed based on the flexible deformation of the flexible portion 216. In FIG. 208, a displacement capability in the vertical direction, that is, a displacement capability in the axial direction is given.
In the diaphragm valve body 200, a communication passage 220 having a small hole diameter is formed to allow the upstream passage 210a in the passage 210 to communicate with the back pressure chamber 218.

The back pressure chamber 218 formed above the diaphragm valve body 200 in the drawing communicates with the downstream passage 210b through the water drain passage 222, and the water drain passage 222 is opened and closed by the plunger valve body 224. It has become.
That is, when the plunger valve 224 is seated on the valve seat 226, the water drain passage 222 is shut off, and when the plunger valve 224 separates upward from the valve seat 226 in the drawing, the water drain passage 222 is opened.

In the diaphragm water stop valve of this example, when the plunger valve 224 is separated from the valve seat 226 to open the water drain passage 222, the water inside the back pressure chamber 218 flows out to the downstream passage 210b through the water drain passage 222.
As a result, the downward pressing force of the back pressure chamber 218 against the diaphragm valve body 200 disappears, where the diaphragm valve body 200 is opened by the water supply pressure, and the water in the upstream passage 210a flows out to the downstream passage 210b.

  On the other hand, when the plunger valve element 224 is closed, the water in the upstream passage 210a flows into the back pressure chamber 218 through the communication path 220, whereby the pressure in the back pressure chamber 218 increases and the diaphragm valve element 200 closes. , Block passage 210. That is, the water is stopped.

  In such a conventional diaphragm type water stop valve, the diaphragm valve body 200 is formed in a set state as shown in FIG. 15B, so that the diaphragm valve body 200 is moved upward in the figure by water supply pressure. When the diaphragm valve body 200 is lifted, a large downward force acts on the diaphragm valve body 200 by its own elastic force. Diaphragm valve element 200 is kept open by the water supply pressure that overcomes its elastic force.

  Therefore, in the case of this type of conventional diaphragm water stop valve, if the start valve such as the plunger valve 224 is closed to shut off the water drain passage 222, the diaphragm valve 200 is immediately closed due to its large elastic force. That is, there is a problem that it is difficult to apply to a self-stop type faucet, a flush valve device such as a urinal or a toilet.

  In order to be applied to a self-stop type faucet or flash valve device, it is necessary to further reduce the hole diameter of the communication passage 220 having a diameter of about 0.5 to 0.7 mm (about 0.2 mm in diameter). However, it is difficult to form such a communication passage 220 having a very small hole diameter in the diaphragm valve body 200, and even if it is formed, the hole diameter of the communication passage 220 is so small that clogging occurs. If such clogging occurs, the water in the upstream passage 210a is not introduced into the back pressure chamber 218 through the communication passage 220, and the diaphragm valve body 200 that has been opened does not close. A problem that causes poor water stoppage occurs.

  Further, in the case of this type of diaphragm water stop valve, a so-called water hammer (water hammer phenomenon) occurs because the time from when the starting valve such as the plunger valve 224 is closed to when the main diaphragm valve 200 is closed is extremely short. There was also a problem that it was easy to do.

  Therefore, the present inventors formed a diaphragm main body in a substantially hat shape in which the folded portion of the flexible portion was elongated and the fixed portion and the closing portion were largely separated in the axial direction, and then the fixed portion and the closed portion were closed. Folding the flexible part located between the part and the fixed part and the closing part deforms the molded product of the diaphragm main body into a shape close to the axial direction until the state of use, and the diaphragm main body with the deformed shape A diaphragm valve element having a set has been devised and proposed in the above-mentioned patent application (Patent Document 1).

In this case, when the diaphragm valve element is opened, that is, lifted up, the force in the valve closing direction due to the elastic force of the diaphragm valve element itself can be reduced, so that the diaphragm valve element in the open state closes. Can take a long time. In other words, the diaphragm valve can be slowly closed over time, and it can be applied to flush valve devices for urinals and toilets and water stop valves for self-stop faucets, which were difficult to apply in the past. It becomes.
Further, since the time from the valve opening state to the valve closing can be lengthened, the occurrence of the water hammer which has conventionally occurred can be prevented.

  In the prior patent application, a flexible portion and a flat closing portion of the diaphragm valve body are separately formed, and the flexible portion is formed of a soft material with a large thickness and a small thickness, while the closing portion is formed of a hard material. It has also been proposed that they are made thicker and assembled to a holding member.

  With this configuration, both the flexibility of the flexible portion and the high durability of the closing portion can be secured, and the diaphragm valve body can be instantaneously opened after the water discharging operation, while the opening and closing operations are repeated. Even in this case, since the closing portion is repeatedly pressed against the valve seat by water pressure, the portion can be prevented from being set or damaged, and advantages such as increased durability can be obtained.

However, in this case, the assemblability of the diaphragm main body and the holding member becomes a serious problem.
For example, as an assembling structure of the diaphragm main body and the holding member, as shown in the comparative example of FIG. 16, an annular gap 228 for fitting the flexible portion 216 into the holding member 214 and a fitting of the closing portion 208 are provided. The gap 230 is formed with an inner peripheral portion of the flexible portion 216 in the gap 228, while the outer peripheral portion of the closing portion 208 is fitted in the gap 230 to fit the diaphragm main body 204 and the holding member 214. In this case, the work of fitting the flexible portion 216 and the closing portion 208 into the holding member 214, particularly the work of fitting the inner peripheral portion of the flexible portion 216 into the gap 228, is considered. This is a very difficult task.

Since the flexible portion 216 is thin (having a thickness of, for example, about 0.4 to 0.5 mm) in the axial direction, and the gap 228 is a narrow gap corresponding to the thickness of the flexible portion 216, The work of fitting the inner peripheral portion of the flexible portion 216 into the gap 228 becomes extremely difficult.
Even if it is not as large as the flexible portion 216, the operation of fitting the outer peripheral portion of the closing portion 208 into the gap 230 is also a difficult operation.

In FIG. 16, reference numeral 232 denotes a guide portion movably fitted into the cylindrical portion of FIG. 15A to guide the movement of the closing portion 208, and is formed integrally with the holding member 214.
Reference numeral 234 denotes a cup-shaped portion, and the closing portion 208 is held in a flat plate shape along the bottom portion 236 of the cup-shaped portion 234, and when the flexible portion 216 deforms along the peripheral wall portion of the cup-shaped portion 234. Shape guided.

In the case of the diaphragm valve body 200 of the comparative example product shown in FIG. 16, there are also the following problems.
In the case of the diaphragm valve body 200, since it is unavoidable that a slight clearance is produced between the closing portion 208 and the holding member 214, the closing portion 208 is specifically attached to the valve seat during the valve closing operation. It has been found that there is a problem that the closing portion 208 moves and rattles when pressed, and at that time, an abnormal noise is generated.
Further, when flowing water at a large flow rate, there is a problem that the closing portion 208 and the flexible portion 216 may come off from the holding member 214 due to the high pressure and large flow rate of water.

The present invention has been devised to solve such a problem.
As prior art to the present invention, there are those disclosed in Patent Documents 2, 3, and 4 below.
In the device disclosed in Patent Document 2, the diaphragm body is vertically sandwiched between a lower disk and a diaphragm plate. The device disclosed in Patent Document 2 has an integral structure of the diaphragm body. Is different from

  Further, the one disclosed in Patent Document 3 below is one in which a plate-shaped closing portion of a diaphragm main body is divided into two members made of different materials and fixed to each other. This is different from the present invention, in that a member made of another material is previously fixed and integrated to form a diaphragm main body.

  Further, the one disclosed in Patent Document 4 divides a holding member into two members and fixes them to each other. These two members are fixed by sandwiching a strainer. It does not relate to the attachment structure, and differs from the present invention in this point.

JP 2003-202084 A JP-A-6-117571 JP-A-11-257507 JP-A-6-78678

  In view of such circumstances, the present invention provides a diaphragm valve body having a flat plate-shaped closing portion which is seated on a valve seat to block a passage at a central portion and has a thin flexible portion around the closing portion. It is an object of the present invention to provide a diaphragm valve body that can easily and firmly assemble a flexible portion with a thin resin and a closed portion with a thick wall and a rigid resin holding member when the flexible portion is formed as a separate member. It is a thing.

  The diaphragm valve element according to the present invention for solving the above-mentioned problems includes: (A) (A) a flat plate-shaped closing portion that sits on a valve seat to block a passage; and (B) a fixing portion of an outer peripheral portion. (C) an elastic body having a thin flexible portion between the closing portion and the fixed portion, and displacing the closing portion in the axial direction based on the flexible deformation of the flexible portion. A diaphragm main body, and (B) a resin holding member made of resin harder than the diaphragm main body, which is assembled to the diaphragm main body and moves integrally with the closing portion, and holds the closing portion in a flat plate shape. In the diaphragm valve body, the closing portion and the flexible portion of the diaphragm main body are configured separately from each other, and the holding member is divided into a first holding member and a second holding member. A second holding member between an outer peripheral portion of the closing portion and a front portion; The inner peripheral portion of the flexible portion, characterized in that secured to each other in a state sandwiching the between one side and the other side of the axial direction (claim 1).

  According to a second aspect, in the first aspect, the closing portion is thicker than the flexible portion.

  According to a third aspect of the present invention, in any one of the first and second aspects, the first holding member is movably fitted into a tubular portion forming a part of the passage, and is disposed in the axial direction of the closing portion. The guide portion for guiding the movement is formed integrally.

  According to a fourth aspect of the present invention, in any one of the first to third aspects, the first sandwiching member is configured to be divided into an inner peripheral side member and an outer peripheral side member, and the inner peripheral side member and the outer peripheral side member are separated. Are fixed to each other so as to sandwich a strainer for removing foreign matter from water passing through a communication passage having a small hole diameter that penetrates the diaphragm valve element from one surface to the other surface.

  According to a fifth aspect of the present invention, in any one of the first to fourth aspects, the second holding member is provided with a ridge projecting toward the flexible portion along a circumferential direction. The second holding member and the first holding member are fixed so as to bite into the flexible portion.

  According to a sixth aspect, in the fifth aspect, the first holding member and the second holding member sandwich an inner peripheral portion of the flexible portion and an outer peripheral portion of the closing portion in a ring shape over the entire circumference, In addition, the ridge is annular and cuts into the flexible portion over the entire circumference.

  According to a seventh aspect of the present invention, in the fourth aspect, the first holding member and the second holding member, and the inner peripheral member and the outer peripheral member of the first holding member are ultrasonic waves of resin. It is characterized by being fixed to each other by welding.

  According to claim 8, in claim 7, the first holding member and the second holding member, and the inner peripheral member and the outer peripheral member of the first holding member are respectively in the same axial direction. It is characterized by being mutually fixed by ultrasonic welding.

Functions and effects of the invention

  As described above, according to the present invention, the holding member is configured to be divided into the first holding member and the second holding member, and the closing portion at the center portion of the diaphragm main body and the flexible portion on the outer peripheral side thereof which are separate from each other are described in detail. The present invention is configured such that the outer peripheral portion of the closing portion and the inner peripheral portion of the flexible portion are sandwiched between the first holding member and the second holding member so as to be fixed to each other. According to this, even when the flexible portion and the closing portion of the diaphragm main body are separated from each other, they can be easily assembled to the holding member to form the diaphragm valve body.

In addition, since both the flexible portion and the closing portion can be firmly fixed to the holding member by fixing the resin to each other, abnormal noise is generated due to the rattling motion of the closing portion during the valve closing operation. Can be solved, and the possibility that the flexible portion and the closing portion come off from the holding member at high pressure and large flow rate can be eliminated.
Here, the closing part can be made thicker than the flexible part (claim 2).

Further, the first holding member of the holding member is integrally formed with a guide portion which is movably fitted into a cylindrical portion forming a part of the passage and guides the movement of the closing portion in the axial direction. (Claim 3).
With this configuration, the guide section is inclined and assembled as in the case where the guide section is separately assembled to the holding member, and the guide section hits the cylindrical section when the diaphragm valve element is opened and closed. The problem of generating abnormal noise can also be solved.

In the present invention, the first holding member may be further divided into an inner peripheral side member and an outer peripheral side member, and the first and second holding members may be fixed to each other so as to sandwich a strainer for removing foreign substances. Item 4).
With this configuration, by fixing the divided members constituting the holding member to each other, the flexible portion and the closing portion of the diaphragm main body and the strainer can be easily assembled to the holding member together.

In the second holding member, a ridge projecting toward the flexible portion is formed along the circumferential direction, and the ridge is fixed to the first holding member in a state where the ridge bites into the flexible portion. (Claim 5).
With this configuration, the thin flexible portion can be firmly fixed to the thin flexible portion based on the biting action of the ridge, so that the thin flexible portion comes off the holding member. Further, it is possible to surely prevent the occurrence.

According to a sixth aspect of the present invention, the first holding member and the second holding member sandwich the inner peripheral portion of the flexible portion and the outer peripheral portion of the closing portion annularly over the entire circumference. In addition, their fixing strength can be made higher.
According to the sixth aspect of the present invention, the protrusion is formed in an annular shape so as to bite into the flexible portion over the entire circumference, and the thin flexible portion is formed over the entire circumference by the biting action of the protrusion. It can be more firmly fixed.

In the present invention, the first holding member and the second holding member, and the inner peripheral member and the outer peripheral member of the first holding member can be fixed to each other by ultrasonic welding of the respective resins ( Claim 7).
In this way, the first holding member and the second holding member, and the inner peripheral member and the outer peripheral member can be easily fixed.
That is, the diaphragm main body and the strainer can be easily attached to the holding member by their fixation.

  In this case, the first holding member and the second holding member, and furthermore, the inner peripheral member and the outer peripheral member can be fixed to each other by ultrasonic welding in the same axial direction (claim 8).

  In the present invention, the flexible portion of the diaphragm body is formed in a shape in which the folded shape is extended, and then the flexible portion located between the fixed portion and the closed portion is folded back to form the fixed portion and the closed portion. It can be deformed into a shape close to the axial center until it is in use, and set in use.

Next, an embodiment of the present invention will be described in detail with reference to the drawings.
In FIG. 1, reference numeral 10 denotes a diaphragm valve of the present embodiment, which comprises a diaphragm main body 12 made of an elastic body (here, rubber) and a holding member 14 made of hard resin.

The diaphragm main body 12 is a member having a circular planar shape, and includes a thick fixed portion 16 at an outer peripheral portion, a flat plate-shaped, specifically, a donut plate-shaped closed portion 18 at a central portion, and a thin flexible portion therebetween. 20.
Here, the flexible portion 20 has an upward folded shape in the set state.

However, this flexible portion 20 is obtained by deforming the shape formed in the shape shown in FIG. 2 (I) into the folded state in use shown in FIGS. 1 and 2 (II).
More specifically, the flexible portion 20 has a shape in which the folded shape as shown in FIG. 2 (I) is straightened, that is, the fixed portion 16 side and the closing portion 18 side are in the axial direction compared to the state in use. The flexible part 20 of the molded product is folded back as shown in FIGS. 1 and 2 (II) so that the fixed part 16 is pivoted toward the closing part 18 side. It is approached in the direction of the center, deformed to the state of use, and assembled and set on the other side.

The diaphragm valve element 10 is fixed to the body of the valve device at a thick fixing portion 16 on the outer peripheral portion, and the displacement of the closing portion 18 in the axial direction is imparted by the flexible deformation of the flexible portion 20. Have been.
That is, the closing portion 18 lifts up by a predetermined stroke from the seating position of the upper end of the cylindrical portion (cylindrical portion) 22 forming a part of the passage 26 shown in FIG. To a position seated on the valve seat 24.

  The holding member 14 is a member that moves integrally with the closing portion 18 of the diaphragm main body 12 in the axial direction, that is, the vertical direction in the figure. The holding member 14 is movably fitted into the cylindrical portion 22 and closed. A guide portion 30 for guiding the movement of the portion 18 in the axial direction is integrally formed.

The holding member 14 also has a cup-shaped portion 32 on the upper side of the diaphragm main body 12, the closing portion 18 is brought into contact with a bottom portion 34 of the cup-shaped portion 32, and a part of the flexible portion 20 is formed on the bottom portion 34. To the peripheral wall portion 36.
The cup-shaped portion 32 holds the closing portion 18 in a flat plate shape, and the flexible portion 20 is guided along the cup-shaped portion 32 when deformed, thereby preventing irregular deformation.

The diaphragm valve body 10 is provided with a communication passage 42 having a small hole diameter from an inlet 38 on the lower surface side to an outlet 40 on the upper surface side in the figure so as to penetrate the diaphragm valve body 10. A strainer 44 for removing foreign matter from water passing through the communication passage 42 is provided at an intermediate position of the communication passage 42.
Here, the strainer 44 has an annular shape over the entire circumference.

In the present embodiment, the holding member 14 made of a hard resin is divided into two parts, a first holding member 46 and a second holding member 48.
The second holding member 48 has a substantially cylindrical shape as a whole as shown in FIG.

The second clamping member 48 has an outer flange portion 50, an inner flange portion 52, and a cylindrical peripheral wall portion 54, and the peripheral wall portion 54 is formed on the first clamping member 46 also shown in FIG. The outer flange 50 extends over the entire inner periphery of the flexible portion 20 and the inner flange 52 extends over the entire outer periphery of the closing portion 18 while being fitted into the corresponding annular concave portion 56. It is fixed to the first holding member 46 in a state of being sandwiched upward from the lower surface side.
Specifically, the second holding member 48 and the first holding member 46 are fixed to each other at the welding portion P1 in FIG. ₁ by ultrasonic welding of the resins.

At this time, the first holding member 46 sandwiches the inner peripheral portion of the flexible portion 20 and the outer peripheral portion of the closing portion 18 downward from the upper surface side, and thus, together with the second holding member 48, the inner peripheral portion of the flexible portion 20. The outer peripheral portion of the closing portion 18 is firmly fixed.
The closing portion 18 is held in a state of being fitted into an annular fitting groove 58 formed in the first holding member 46 at an inner peripheral portion thereof.

  As shown in the partially enlarged view of FIG. 1, the second holding member 48 is provided with a ridge 60 projecting in a triangular cross section upward in the drawing toward the inner peripheral portion of the flexible portion 20, specifically, the inner peripheral portion thereof. The protrusion 60 cuts into the inner peripheral portion of the flexible portion 20 to firmly fix it.

As shown in FIG. 3, the first holding member 46 is further divided into two parts, an inner peripheral member 46-1 and an outer peripheral member 46-2. _{In 2} , the resins are fixed to each other by ultrasonic welding.

  As shown in FIG. 5, the guide portion 30 is formed integrally with the inner peripheral member 46-1. Further, the inner peripheral member 46-1 has a first flange portion 62 and an outer peripheral side member 46-1. The second flange portion 64 is integrally formed, and the first flange portion 62 and the first stepped portion 66 of the outer peripheral side member 46-2 also shown in FIG. In this state, the second flange portion 64 and the second stepped portion 68 of the outer peripheral side member 46-2 are fixed in the vertical direction in the figure by ultrasonic welding.

  In the diaphragm valve element 10 according to the present embodiment configured as described above, the flexible member 20 and the closing part 18 of the diaphragm main body 12 are formed separately from each other, but the first holding member of the holding member 14 is used. By ultrasonically welding the 46 and the second holding member 48, it is possible to easily and firmly assemble the holding member 14.

  Further, since both the flexible portion 20 and the closing portion 18 can be firmly fixed by ultrasonic welding of the resins, when the valve closing operation is performed, more specifically, when the closing portion 18 is seated on the valve seat 24, the closing portion is closed. Thus, the problem that the rattle 18 does not rattle and the noise is generated due to the rattle can be solved.

  Further, since both the flexible portion 20 and the closing portion 18 are firmly fixed to the holding member 14, there is a possibility that the flexible portion 20 and the closing portion 18 may come off from the holding member 14 at a high pressure and a large flow rate. Absent.

  In addition, in this example, since the guide portion 30 is formed integrally with the holding member 14, unlike the case where the guide portion 30 is separately attached to the holding member 14, the guide portion 30 is inclined and assembled. There is no problem that the guide portion 30 hits the cylindrical portion 22 and generates abnormal noise when the diaphragm valve element 10 is opened and closed.

  In this example, it is also possible to fix the three divided resin members, specifically, the inner peripheral member 46-1 and the outer peripheral member 46-2 of the second clamping member 48 and the first clamping member 46 by ultrasonic welding. There is an advantage that the strainer 44 is assembled at the same time as the bending portion 20 and the closing portion 18, and the ultrasonic welding of the three resin members may be performed in the same axial direction. be able to.

  Further, in this example, the second holding member 48 is provided with a ridge 60 having an annular and sharp cross-sectional shape, and the ridge 60 is made to bite into the thin flexible portion 20. When the flexible portion 20 is fixed in a sandwiched state by the second holding member 48 and the first holding member 46, the flexible portion 20 can be more reliably prevented from coming off the holding member 14.

  Further, in this example, the inner peripheral portion of the flexible portion 20 and the outer peripheral portion of the closing portion 18 are circumferentially sandwiched and fixed by the second clamping member 48 and the first clamping member 46 from both sides opposite to each other over the entire periphery. Therefore, the fixing strength can be made high.

FIG. 7 shows another embodiment of the present invention.
In this example, the contact portion of the closing portion 18 to the valve seat 24 is partially protruded annularly and downward in the drawing, and the lower surface of the protruding portion 70 in the drawing is the same as the lower surface of the second holding member 48 in the drawing. In the case of this example, the flow of water becomes good at the time of the valve closing operation of the diaphragm valve body 10, and the effect of preventing the occurrence of running water noise or suppressing it to a low level can be obtained.

FIGS. 8 and 9 show still another embodiment of the present invention. Here, a plurality of protrusions 60 are provided on the second holding member 48, specifically, on the outer flange portion 50 thereof (two in FIG. 8. 9 is an example in which 3) concentrically provided.
By doing so, the fixing strength of the flexible portion 20 to the inner peripheral portion can be further increased.

FIG. 10 shows still another embodiment of the present invention. In this embodiment, as shown in FIG. 10A, not only the second holding member 48 but also the first holding member 46, more specifically, the outer peripheral member 46- is used. 2 is an example in which a protruding ridge 60 having a triangular cross section and projecting downward in the figure and forming an annular shape over the entire circumference is provided, and this is cut into the flexible portion 20 of the diaphragm main body 12.
Here, the ridge 60 on the outer peripheral side member 46-2 side is provided at a position slightly shifted in the direction perpendicular to the axis with respect to the ridge 60 on the second holding member 48 side.

On the other hand, FIG. 10B shows a state in which a plurality of (here, two) ridges 60 are provided concentrically on the second holding member 48, and further, an outer peripheral side member 46-2 of the first holding member 46 is illustrated. This is an example in which a protruding ridge 60 projecting downward and inward is provided.
In this example, the positions of the ridges 60 on the second holding member 48 side and the ridges 60 on the outer peripheral side member 46-2 side are determined so as to be staggered in the direction perpendicular to the axis.

On the other hand, FIG. 11 shows still another embodiment of the present invention. In this embodiment, the second sandwiching member 48 is provided with the ridge 60 (in this embodiment, two ridges 60 are provided). At the same position perpendicular to the axis, the first holding member 46, specifically the outer peripheral side member 46-2, has a cross-sectional shape corresponding to the first holding member 46, specifically, a triangular cross-section upward in the drawing, and is continuous in the circumferential direction. This is an example in which a plurality of (two) concentric concave grooves 72 are provided concentrically.
In this embodiment, the flexible portion 20 is pushed into the concave ridge 72 by the protrusion 60 and bites into it, so that the fixing strength of the flexible portion 20 can be increased.

FIG. 12 shows still another embodiment of the present invention.
As shown in the figure, in this embodiment, as shown in (A), an annular fitting portion 74 is provided at the inner peripheral end portion of the flexible portion 20 over the entire circumference facing upward in the figure, and this is fitted to the first holding member. 46, more specifically, by being fitted and fixed in an annular fitting concave portion 76 formed at a position corresponding to the outer peripheral side member 46-2, or as shown in FIG. The portion is provided with an annular fitting portion 78 extending all around in the downward direction in the figure, and is fitted and fixed in an annular fitting concave portion 80 formed at a corresponding position of the second holding member 48. It is an example.
In the embodiment shown in FIGS. 12A and 12B, a ridge 60 is provided on the second holding member 48 side, and the ridge 60 cuts into the flexible portion 20.

FIG. 13 shows still another embodiment of the present invention. FIG. 13 (A) shows the height in the axial direction of the fitting portion 74 of the flexible portion 20 in the embodiment shown in FIG. 12 (A). The example of FIG. 13B is an example in which the thickness of the fitting portion 74 in the direction perpendicular to the axis in the embodiment of FIG.
Further, the embodiment of FIG. 14 shows an example in which the height in the axial direction and the thickness in the direction perpendicular to the axis of the fitting portion 74 in the embodiment of FIG.

  As described above, several means for further increasing the fixing strength of the flexible portion 20 of the diaphragm main body 12, more specifically, the inner peripheral portion thereof, are illustrated in FIGS. 8 to 14, which are illustrated in FIGS. 8, 9, 10, and 10. The means for improving the fixing strength shown in FIGS. 11, 12, 13, and 14 may be appropriately combined.

In addition, the ridges 60, the concave ridges 72, the fitting portions 74, 78, and the fitting recesses 76, 80 have been described as forming a continuous annular shape in the circumferential direction. However, in some cases, these may be partially formed along the circumferential direction. It is also possible to provide them.
Further, depending on the case, it is also possible to apply these means for improving the fixing strength to the fixing structure of the closing portion 18 by the inner flange portion 52 and the first holding member 46 in the second holding member 48.

The embodiment of the present invention has been described in detail above, but this is merely an example.
For example, in the above example, a cylindrical peripheral wall portion 54 is provided on the second holding member 48, this is fitted into an annular concave portion 56 provided on the first holding member 46, and they are ultrasonically welded. In some cases, an upwardly protruding portion in FIG. 1 is provided on the second holding member 48 partially in the circumferential direction, and the protruding portion is fitted into a concave portion provided on the first holding member 46 at a corresponding interval. In this state, the two resin members can be ultrasonically welded.

  In the above example, in order to fix the strainer 44, the first holding member 46 is divided into an inner peripheral side member 46-1 and an outer peripheral side member 46-2, and these are ultrasonically welded. In the case where the first holding member 46 is not configured with the structure of being sandwiched in the form as in the above example, the inner peripheral member 46-1 and the outer peripheral member 46-2 of the first holding member 46 can be integrally formed. It is.

  Further, in the above example, the flexible portion 20 is formed into a substantially hat shape, and then is folded and deformed to a state of use, but the flexible portion 20 is formed in advance in the same shape as the final use state. Even in such cases, the present invention can be applied in various modified forms without departing from the spirit of the present invention.

It is sectional drawing of the diaphragm valve body of one Embodiment of this invention. FIG. 2 is a diagram showing a flexible portion of the diaphragm valve element of FIG. 1 in both a shape at the time of molding and a shape at the time of use. It is a figure which shows the holding member of the embodiment separated into three resin members. FIG. 3 is a diagram showing one divided body of a holding member in the same embodiment. It is a figure which shows another division body different from FIG. FIG. 6 is a diagram illustrating another divided body different from FIGS. 4 and 5. It is sectional drawing of the diaphragm valve body of other embodiment of this invention. It is sectional drawing which shows the principal part of the diaphragm valve body of other embodiment of this invention. It is sectional drawing which shows the principal part of the diaphragm valve body of other embodiment of this invention. It is sectional drawing which shows the principal part of the diaphragm valve body of other embodiment of this invention. It is sectional drawing which shows the principal part of the diaphragm valve body of other embodiment of this invention. It is sectional drawing which shows the principal part of the diaphragm valve body of other embodiment of this invention. It is sectional drawing which shows the principal part of the diaphragm valve body of other embodiment of this invention. It is sectional drawing which shows the principal part of the diaphragm valve body of other embodiment of this invention. It is a figure showing an example of the conventional diaphragm valve element. It is a comparative example figure which shows the diaphragm valve body which the inventors devised as a comparative example.

Explanation of reference numerals

DESCRIPTION OF SYMBOLS 10 Diaphragm valve body 12 Diaphragm main body 14 Holding member 16 Fixed part 18 Closed part 20 Flexible part 22 Cylindrical part (cylindrical part)
24 Valve seat 26 Passage 30 Guide portion 42 Communication passage 44 Strainer 46 First holding member 46-1 Inner peripheral member 46-2 Outer peripheral member 48 Second holding member 60 Protrusion

Claims (8)

(A) (A) A flat plate-shaped closing portion that sits on a valve seat to block a passage, (B) a fixed portion at an outer peripheral portion, and (C) a thin portion between the closed portion and the fixed portion. A diaphragm main body made of an elastic body, wherein the closing part is assembled to the diaphragm main body and displaces the closing part in the axial direction based on the flexible deformation of the flexible part. And a holding member made of a resin harder than the diaphragm main body, which moves integrally with the portion and holds the closing portion in a flat plate shape,
The closing portion and the flexible portion of the diaphragm main body are configured separately, and the holding member is configured to be divided into a first holding member and a second holding member, and the first holding member, the second holding member, Wherein the outer peripheral portion of the closing portion and the inner peripheral portion of the flexible portion are sandwiched between one surface and the other surface in the axial direction.   2. The diaphragm valve according to claim 1, wherein the closing portion is thicker than the flexible portion.   The guide portion according to any one of claims 1 and 2, wherein the first holding member is movably fitted into a cylindrical portion forming a part of the passage and guides movement of the closing portion in an axial direction. Characterized by being integrally molded.   In any one of claims 1 to 3, the first holding member is configured to be divided into an inner peripheral member and an outer peripheral member, and the inner peripheral member and the outer peripheral member are connected to the diaphragm valve body. A diaphragm valve body fixed to a state in which a strainer for removing foreign matter from water passing through a small-diameter communication passage penetrating from one surface to the other surface is sandwiched therebetween.   5. The second holding member according to claim 1, wherein the second holding member is formed with a ridge projecting toward the flexible portion along a circumferential direction, and the ridge is made to bite into the flexible portion. The diaphragm valve body, wherein the second holding member and the first holding member are fixed in a state.   In claim 5, the first holding member and the second holding member sandwich an inner peripheral portion of the flexible portion and an outer peripheral portion of the closing portion in an annular shape over the entire circumference, and the ridge has an annular shape. A diaphragm valve element, wherein the diaphragm valve element is formed so as to penetrate the flexible portion over the entire circumference.   5. The first holding member and the second holding member according to claim 4, wherein the inner peripheral member and the outer peripheral member of the first holding member are fixed to each other by ultrasonic welding of resins. A diaphragm valve element characterized by being provided.   8. The device according to claim 7, wherein the first holding member and the second holding member, and the inner peripheral member and the outer peripheral member of the first holding member are fixed to each other by ultrasonic welding in the same axial direction. A diaphragm valve element characterized by being provided.

Images