JP2011226507A - Fluid controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fluid controller capable of preventing leakage of a fluid to outside by suppressing wearing of an annular projection by preventing sliding of the annular projection of a diaphragm which is caused by repeated opening/closing operation of a flow path, with no increase in the size of a valve body, being excellent in workability in assembly, with no stay of fluid occurring at a housing portion of the diaphragm.SOLUTION: The fluid controller includes a valve body 1 containing an inlet flow path 5, an outlet flow path 6, and a valve seat 7; a diaphragm 2 which permits or blocks communication of a fluid by abutting with/separating from the valve seat 7; an operation mechanism 3 for operating the diaphragm 2; and a bonnet 4 for sandwiching the diaphragm 2 with the valve body 1. The diaphragm 2 contains an annular projection 2A near the outer edge of a lower surface. A step is formed on the upper surface of the valve body 1 of which the inside of a portion 1A to which the annular projection 2A abuts is lower than the outer face of the portion. At least a tip part of the annular projection 2A of the diaphragm 2 is arranged inside the step.

Description

  The present invention relates to a fluid controller, and more particularly to a fluid controller that opens and closes a flow path by bringing a diaphragm into contact with and away from a valve seat.

FIG. 7 is a partial sectional front view showing an example of a conventional fluid controller.
The fluid controller shown in FIG. 7 is operated by driving the operating mechanism (A) with air or the like to bring the diaphragm (D) into contact with and away from the valve seat (S) formed on the valve body (B). It is configured to open and close the road.

FIG. 8A is a rear view of the diaphragm (D) used in the fluid controller shown in FIG.
The diaphragm (D) has an annular ridge (R1) formed in the vicinity of the outer edge thereof, and a linear ridge (R2) that vertically cuts the inside of the annular ridge (R1). When the protrusions (R1) and (R2) are in close contact with the valve seat (S), leakage of fluid to the outside is prevented and the flow path is closed when the diaphragm is lowered.

In the conventional fluid controller as shown in FIG. 7, when the diaphragm (D) is lowered to contact the valve seat (S), the annular ridge (R1) slightly expands in the radial direction ( When the diaphragm (D) is raised, the original state is restored.
Therefore, when the opening / closing operation of the flow path (the raising / lowering operation of the diaphragm (D)) is repeated, the sliding of the annular ridge (R1) in the radial direction is repeated, and occurs between the upper surface of the valve body (B). There was a problem that the annular ridge (R1) was abraded due to friction and the sealing performance was lowered, causing leakage of fluid to the outside.

On the other hand, as another fluid controller provided with a diaphragm having an annular ridge, for example, there is a fluid controller described in Patent Document 1 previously proposed by the applicant of the present application.
In this fluid controller, the diaphragm has a two-layer structure of a lower diaphragm and an upper diaphragm. An annular ridge comprising an outer ring ridge and an inner ring ridge is formed in the vicinity of the outer edge of the lower diaphragm, and an inner ring. A vertical ridge that vertically cuts the ridge is formed, and the outer ring ridge protrudes in the vertical direction (see FIGS. 18 and 19 of Patent Document 1).
An annular groove is formed on the upper surface of the valve body to accommodate the outer ring ridge protruding downward, and an upper diaphragm is laminated inside the outer ring ridge protruding upward.

However, in this fluid controller, since the annular ridge is composed of an outer ring ridge and an inner ring ridge, a large area is required on the upper surface of the valve body to receive these double ridges. Will become larger.
Further, since the upper diaphragm is not positioned by the valve body and is fastened and fixed in a state where it is placed on the lower diaphragm, there is a possibility that a positional shift may occur at the time of fastening and the assembling workability is poor.
Further, when fluid enters the annular groove that accommodates the outer ring ridge, the fluid that has entered cannot be released, and the fluid accumulates in the annular groove.
As described above, the fluid controller described in Patent Document 1 has problems different from the above problems. Therefore, without causing these problems, the fluid caused by the wear of the annular protrusion described above. It has been desired to create a fluid controller that can prevent external leakage of the fluid.

Japanese Patent No. 4232939

  The present invention has been made to solve the above-described problems of the prior art, and in a fluid controller that opens and closes a flow path by bringing a diaphragm into contact with and away from a valve seat, the flow path is opened and closed. It prevents sliding of the annular ridge of the diaphragm due to repeated operation, thereby suppressing wear of the annular ridge and preventing external leakage of the fluid, and without enlarging the valve body It is an object of the present invention to provide a fluid controller that is excellent in assembling workability and that does not cause fluid accumulation in a diaphragm housing portion.

  The invention according to claim 1 is a valve body having an inlet channel, an outlet channel, and a valve seat, and a fluid that flows from the inlet channel to the outlet channel by contacting and separating from the valve seat. A diaphragm that allows or blocks flow, an operating mechanism for operating the diaphragm, and a bonnet that sandwiches the diaphragm between the valve body, and the diaphragm is annular in the vicinity of the outer edge portion of the lower surface A step is formed on the upper surface of the valve body, the step being formed such that the inner side is lower than the outer side of the portion with which the annular projection contacts, and at least the annular projection of the diaphragm is formed. The present invention relates to a fluid controller characterized in that the tip of the strip is disposed inside the step.

  The invention according to claim 2 relates to the fluid controller according to claim 1, wherein the entire annular protrusion is disposed inside the step.

  The invention according to claim 3 is characterized in that the outer peripheral surface of the annular ridge is in contact with the corner formed by the upper surface outside the step and the side surface of the step. The fluid controller according to claim 1.

  The invention according to claim 4 is characterized in that the upper surface of the valve body is inclined downward toward the opening of the inlet channel and the outlet channel, the inside of the step. The fluid controller according to any one of Items 3 to 3.

  The invention according to claim 5 is characterized in that, in the state when the diaphragm is raised, the outer diameter of the annular protrusion is equal to the diameter of the boundary line inside and outside the step. The fluid controller described.

  The invention according to claim 6 is a semicircular shape in which the longitudinal cross-sectional shape of the annular ridge protrudes downward, and the side surface of the step is a tapered surface that inclines inward from the top to the bottom. The fluid controller according to any one of claims 1 to 5.

  According to the first aspect of the present invention, the diaphragm has an annular ridge in the vicinity of the outer edge portion of the lower surface, and the inner side of the upper surface of the valve body is outside the portion where the annular ridge contacts. A step which is lower than that of the diaphragm is formed, and at least the tip of the annular ridge of the diaphragm is disposed inside the step, so that the sliding of the diaphragm to the outside of the annular ridge is caused by the step. Be regulated. As a result, it is possible to suppress wear of the annular ridge caused by repeated opening and closing operations of the flow path, and it is possible to prevent fluid leakage over a long period of time. Further, the valve body does not increase in size as in the case where the annular ridges are provided twice. Further, the diaphragm is not displaced during tightening, and positioning can be performed easily, so that the assembly workability is excellent. And since the contact part of a diaphragm and a valve body becomes outside the front-end | tip part of an annular | circular shaped protrusion, there is no possibility that a fluid may enter between a diaphragm and a valve body when performing the opening / closing operation | movement of a flow path.

  According to the invention according to claim 2, since the entire annular ridge is disposed inside the step, the outer peripheral surface comes into contact with the side surface of the step rather than the tip of the annular ridge. The side surface of the ring-shaped protrusion can reliably prevent the annular protrusion from sliding outward.

  According to the invention of claim 3, since the outer peripheral surface is in contact with the corner formed by the upper surface outside the step and the side surface of the step rather than the tip of the annular ridge, the corner of the step The sliding to the outside of the annular ridge can be reliably prevented by the portion.

  According to the invention of claim 4, since the inner surface of the step is inclined downward toward the opening of the inlet channel and the outlet channel, the upper surface of the valve body has an inner portion of the step. There is no accumulation of fluid.

  According to the invention of claim 5, since the outer peripheral surface is closer to the side surface of the step than the front end portion of the annular ridge without a gap, the outer peripheral surface and the side surface of the step are more than the front end portion of the annular ridge. There is no risk of fluid accumulation between

According to the invention of claim 6, since the outer diameter of the annular ridge and the diameter of the boundary line inside and outside the step are equal in the state when the diaphragm is raised, In this state, the outer edge of the annular ridge contacts the side surface of the step. Therefore, it is possible to reliably prevent the annular ridge from expanding outward when the diaphragm is lowered, and it is possible to more effectively suppress wear of the annular ridge.
Further, it is possible to easily and accurately position the diaphragm at the time of assembling the fluid controller, and the assembling accuracy and workability are excellent.

According to the invention which concerns on Claim 7, the longitudinal cross-sectional shape of a cyclic | annular protrusion is a semicircle which protrudes below, Comprising: The side surface of the said level | step difference becomes a taper surface which inclines inside as it goes below from the top. Therefore, when the annular ridge tries to expand outward, the outer edge surface of the annular ridge can be reliably received by the inner surface of the step, thereby preventing the annular ridge from expanding.
In addition, when the fluid controller is assembled, the diaphragm can be easily and accurately positioned with respect to the upper surface of the valve body.

BRIEF DESCRIPTION OF THE DRAWINGS It is a partial cross section front view which shows the fluid controller which concerns on this invention, Comprising: (a) is a general view, (b) is the enlarged view in a circle of (a) figure. It is a figure which shows a valve body, Comprising: (a) is a top view, (b) is the sectional view on the AA line of (a) figure, (c) is the sectional view on the BB line of (a) figure. It is a figure which shows a diaphragm, Comprising: (a) is a longitudinal cross-sectional view, (b) is an enlarged view in a circle of (a) figure, (c) is a back view. This is a modified example in which the diaphragm has a two-layer structure of a synthetic resin film and a rubber film. It is the elements on larger scale of the modification which shows the case where the outer peripheral surface is contacting the corner | angular part (boundary line of a level | step difference) formed with the upper surface of a valve body and the side surface of a level | step difference rather than the front-end | tip part of an annular | circular shaped protrusion. . It is the elements on larger scale of the modification which shows the case where an outer peripheral surface is closely_contact | adhered with the side surface of a level | step difference without a clearance gap rather than the front-end | tip part of an annular | annular protrusion. It is a partial cross section front view which shows an example of the conventional fluid controller. (A) is a back view of the diaphragm used for the conventional fluid controller shown in FIG. 7, (b) is a figure for demonstrating the problem of the conventional fluid controller.

Hereinafter, preferred embodiments of a fluid controller according to the present invention will be described with reference to the drawings.
FIG. 1 is a partial cross-sectional front view showing a fluid controller according to the present invention, where (a) is an overall view and (b) is an enlarged view in a circle of FIG.
The fluid controller according to the present invention includes a valve body (1), a diaphragm (2), an operation mechanism (3), and a bonnet (4).

2A and 2B are views showing the valve body 1, in which FIG. 2A is a plan view, FIG. 2B is a cross-sectional view taken along the line AA in FIG. It is line sectional drawing.
The valve body (1) is raised between an inlet channel (5) serving as a fluid inlet, an outlet channel (6) serving as a fluid outlet, and between the inlet channel (5) and the outlet channel (6). It has a valve seat (7) formed in this way.
On the upper surface of the valve body (1), an opening (inlet side opening (8)) of the inlet channel (5) and an opening (outlet side opening (9)) of the outlet channel (6) are opened. is doing.

Further, a step is formed on the upper surface of the valve body (1) so that the inner side is lower than the outer side of the part (1A) where the annular ridge (2A) of the diaphragm (2) to be described later contacts. Yes. In FIG. 2, reference numeral (10) is attached to the inner and outer boundary lines of the step.
Here, the portion (1A) where the annular ridge (2A) abuts on the upper surface of the valve body (1) is from the tip (lowermost) portion of the annular ridge (2A) to the outer edge in the example of FIG. In the example of FIG. 5 to be described later, the outer peripheral surface of the annular protrusion (2A) is a corner portion formed by the upper surface of the valve body and the side surface of the step (boundary line (10) of the step). ).

In the present invention, the inner side of the tip of the annular ridge (2A) is preferably not in contact with the upper surface (the inner surface of the step) of the valve body (1) (see FIGS. 1 and 5).
This prevents fluid from accumulating between the annular ridge (2A) and the valve body (1) inside the tip of the annular ridge (2A).

As shown in FIG. 2A, the boundary line (10) of the step is formed in a circular shape including the inlet side opening (8) and the outlet side opening (9) on the inner side, and the valve body (1). The upper surface of is recessed so that the inner side of the boundary line (10) is lower than the outer side.
In the present invention, “inside” refers to the side close to the center of the upper surface of the valve body, and “outside” refers to the side far from the center of the upper surface of the valve body.

The height of the step formed on the upper surface of the valve body (1) is preferably set to be less than the height of the annular ridge (2A) of the diaphragm (2).
The reason is that when the height of the step formed on the upper surface of the valve body (1) is equal to or higher than the height of the annular ridge (2A), the diaphragm (2) is connected to the valve body (1) and the bonnet (4). This is because the annular protrusion (2A) cannot be compressed and deformed when it is sandwiched between the two, and good sealing performance may not be obtained.
However, the height of the step may be equal to or higher than the height of the annular ridge (2A).

In the upper surface of the valve body (1), the inner side of the step (the inner side from the boundary line (10)) is preferably inclined downward toward the inlet side opening (8) and the outlet side opening (9). (Refer to the enlarged view in a circle in FIGS. 2B and 2C). 2A to 2C, the downwardly inclined surface (hereinafter referred to as a downwardly inclined surface) is denoted by reference numeral (11).
Since the inside of the step is inclined downward toward the inlet side opening (8) and the outlet side opening (9), it is possible to reliably prevent the accumulation of fluid in the inner portion of the step.
The portion (1A) with which the annular ridge (2A) abuts is a part of the downwardly inclined surface (11), and more specifically, an outer portion of the downwardly inclined surface (11). (See FIG. 1 (b)).

It is preferable that the side surface (inner surface) (12) of the step is a tapered surface that is inclined inwardly from the top to the bottom (see enlarged views in a circle in FIGS. 2B and 2C).
As will be described later, the longitudinal cross-sectional shape of the annular ridge (2A) of the diaphragm (2) is a semicircular shape protruding downward. Therefore, if the inner surface (12) of the step is such a tapered surface, when the annular ridge (2A) tries to expand outward, the outer edge surface of the annular ridge (2A) is stepped. It can receive reliably by the inner surface (12) of this, and can prevent the annular protrusion (2A) from spreading outward.
Further, when assembling the fluid controller, the diaphragm (2) can be easily and accurately positioned with respect to the upper surface of the valve body (1).

FIGS. 3A and 3B are diagrams showing the diaphragm (2), in which FIG. 3A is a longitudinal sectional view, FIG. 3B is an enlarged view in a circle of FIG.
The diaphragm (2) abuts and separates (lifts) against the valve seat (7) provided on the valve body (1), so that the fluid from the inlet channel (5) to the outlet channel (6) Allow or block distribution.

Diaphragm (2) is formed of an elastic material excellent in flexibility, corrosion resistance, and heat resistance. Specifically, synthetic resin such as tetrafluoroethylene resin (PTFE), natural rubber, nitrile rubber, styrene It is formed from rubber such as rubber, butadiene / isobutylene synthetic rubber, polychloroprene rubber, butyl rubber, silicon rubber, polyurethane rubber, fluorine rubber (FPM), and ethylene propylene rubber (EPDM).
The diaphragm (2) may have a single-layer structure made of a single material (for example, PTFE) or a two-layer structure of a synthetic resin film (21) and a rubber film (22) as shown in FIG. It may be.

A suspension fitting (13) that is engaged with a compressor (14) that presses the diaphragm (2) (see FIG. 1) is attached to the upper portion of the diaphragm (2).
The diaphragm (2) has an annular ridge (2A) and a linear ridge (2B) on the lower surface in contact with the valve seat (7). The annular ridge (2A) is formed in the vicinity of the outer edge portion of the lower surface in contact with the valve seat (7), and the linear ridge (2B) is formed so as to cut through the inside of the annular ridge (2A). Has been.
The longitudinal cross-sectional shape of the annular ridge (2A) and the linear ridge (2B) has a semicircular shape protruding downward as shown in FIGS. The tip of the annular ridge in the present invention means a semicircular tip (lowermost part) protruding downward.

The annular ridge (2A) of the diaphragm (2) is arranged at least inside the step formed on the upper surface of the valve body (1) described above when the fluid controller is assembled.
That is, at least the tip of the annular ridge (2A) of the diaphragm (2) has a recessed portion (downwardly inclined surface (downward surface) (10) below the step boundary (10) formed on the upper surface of the valve body (1). 11) above). In addition, the outer portion (2C) of the annular ridge (2A) of the diaphragm (2) is disposed in a non-recessed portion outside the boundary line (10) of the step.

  In the present invention, the entire annular protrusion (2A) is preferably disposed inside the step as shown in FIG. 1, but at least the tip of the annular protrusion (2A) as shown in FIG. Only a part including the portion may be disposed inside the step. In the example shown in FIG. 5, the outer peripheral surface of the annular ridge (2A) is in contact with the corner (step boundary (10)) formed by the upper surface of the valve body and the side surface of the step. ing. In this case, the portion (1A) with which the annular ridge (2A) abuts is coincident with the corner (step boundary line (10)).

By disposing at least the tip of the annular ridge (2A) of the diaphragm (2) inside the step formed on the upper surface of the valve body (1), the annular protrusion is caused by the lowering operation of the diaphragm (2). When the strip (2A) tries to expand outward, the outer edge of the annular ridge (2A) hits the inner surface (12) or corner (10) of the step to prevent it from expanding (sliding). Is done.
As a result, it is possible to suppress the wear of the annular ridge (2A) caused by the repeated opening and closing operation of the flow path, and it is possible to prevent the fluid from leaking over a long period of time.

The outer diameter (diameter of the outer edge portion) (D1) of the annular ridge (2A) and the diameter (D2) of the boundary line (10) of the step are the states when the diaphragm (2) is raised (FIG. 3 (a)). In the state of
As a result, the outer edge of the annular ridge (2A) comes into contact with the inner surface of the step when the diaphragm (2) is raised, and the annular ridge (2A) is moved when the diaphragm (2) is lowered. It is reliably prevented from spreading outward, and wear of the annular ridge (2A) can be more effectively suppressed.
In addition, the diaphragm (2) can be positioned easily and accurately when the fluid controller is assembled, and the assembly accuracy and workability are excellent.
However, the outer diameter (D1) of the annular ridge (2A) may be slightly larger than the diameter (D2) of the step boundary line (10) in the state in which the diaphragm (2) is raised (FIG. 5). reference).

In the present invention, it is preferable that the outer peripheral surface of the annular ridge (2A) is in close contact with the side surface (12) of the step without a gap (see FIG. 6).
In the example shown in FIG. 6, the side surface (12) of the step is formed in a round shape at the corner that transitions to the lower surface, and the round of the corner is more on the outer peripheral surface than the tip of the annular ridge (2 A). By matching with R, the outer peripheral surface is in closer contact with the side surface (12) of the step with no gap than the tip of the annular ridge (2A).
Thereby, there is no possibility that a fluid may accumulate between an outer peripheral surface and the side surface (12) of a level | step difference rather than the front-end | tip part of a cyclic | annular protrusion (2A).

  The operation mechanism (3) is a mechanism for operating (elevating operation) the diaphragm (2) via the suspension fitting (13) and the compressor (14), and moving the diaphragm (2) up and down to raise the valve seat ( 7) Abut against and separate from. In the present invention, the specific configuration of the operation mechanism (3) is not particularly limited, and a known operation mechanism such as a pneumatic operation type or a manual type can be used.

The bonnet (4) is fixed to the upper surface of the valve body (1) with bolts or the like, and the diaphragm (2) is sandwiched between the lower surface thereof and the upper surface of the valve body (1).
The inner diameter (D3) of the lower surface of the bonnet (4) is preferably equal to or smaller than the inner diameter (D4) of the annular ridge (2A) of the diaphragm (2) (see FIG. 1 (b)).
When the inner diameter (D3) of the lower surface of the bonnet (4) is equal to or smaller than the inner diameter (D4) of the annular protrusion (2A) of the diaphragm (2), the annular protrusion (2A) is formed by the lower surface of the bonnet (4). Can be reliably pressed and deformed, and good sealing performance can be secured.

  The fluid controller according to the present invention can be widely used to control the flow of fluid in various pipes such as a culture liquid sampling pipe in a microorganism culturing apparatus. In particular, the flow path is frequently opened and closed. It is suitably used for applications where there is a concern about wear of the diaphragm.

DESCRIPTION OF SYMBOLS 1 Valve body 1A The part which the annular protrusion of a diaphragm contact | abuts 2 Diaphragm 2A Circular protrusion 2B Linear protrusion 3 Operation mechanism 4 Bonnet 5 Inlet flow path 6 Outlet flow path 7 Valve seat 8 Opening part of an inlet flow path ( Entrance side opening)
9 Opening of outlet channel (opening side opening)
10 Step boundary line (corner formed by the upper surface of the valve body and the side surface of the step)
11 Downwardly inclined surface (downwardly inclined surface)
12 Step side (inner side)
D1 Outer diameter of the annular ridge (outer edge diameter)
D2 Step boundary diameter D3 Bonnet underside D4 Inner ring inner diameter

Claims (7)

A valve body having an inlet channel, an outlet channel and a valve seat;
A diaphragm that allows or blocks the flow of fluid from the inlet channel to the outlet channel by abutting and separating from the valve seat;
An operating mechanism for operating the diaphragm;
A bonnet for sandwiching the diaphragm with the valve body;
The diaphragm has an annular ridge in the vicinity of the outer edge portion of the lower surface,
On the upper surface of the valve body, a step is formed in which the inside is lower than the outside than the portion where the annular ridge contacts,
The fluid controller according to claim 1, wherein at least a tip of the annular ridge of the diaphragm is disposed inside the step.   The fluid controller according to claim 1, wherein the entire annular ridge is disposed inside the step.   2. The fluid controller according to claim 1, wherein the outer peripheral surface of the annular ridge is in contact with a corner formed by an upper surface outside the step and a side surface of the step. .   4. The fluid according to claim 1, wherein an inner surface of the step is inclined downward toward an opening of the inlet channel and the outlet channel on an upper surface of the valve body. Controller.   The fluid controller according to claim 4, wherein an outer peripheral surface of the annular protrusion is in close contact with a side surface of the step without a gap.   3. The fluid controller according to claim 1, wherein an outer diameter of the annular protrusion is equal to a diameter of an inner boundary line and an outer boundary line of the step when the diaphragm is raised. 4. The longitudinal cross-sectional shape of the annular ridge is a semicircle projecting downward,
The fluid controller according to any one of claims 1 to 6, wherein a side surface of the step is a tapered surface that is inclined inwardly from the top to the bottom.

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