JP2005147202A - Fluid controller - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fluid controller with a diaphragm whose fastening degree can be visually, easily and accurately identified without causing the leakage of fluid distributing in a flow path to the outside even when a portion of the diaphragm abutting on the opening edge of a valve box deteriorates. <P>SOLUTION: The fluid controller comprises the valve casing having an inlet flow path and an outlet flow path, a valve body, the diaphragm fixed in the state of being held in a gap between the valve casing and the valve body via a holding member, and an operation mechanism for expanding the diaphragm. The valve casing has an endless sealing protruded portion abutting on the peripheral side face of the holding member for sealing the inlet flow path and the outlet flow path. The holding member enters into a recessed portion encircled by the sealing protruded portion and the lower face of the holding member abuts on the upper face of the diaphragm instead of the upper face of the sealing protruded portion. The upper end on the peripheral side face of the holding member is located above the upper end face of the sealing protruded portion and the peripheral side face of the holding member is provided with an indicator which allows visual identification of the degree of a depth of the peripheral side face entering into the recessed portion. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a fluid controller, and the purpose thereof is to prevent the fluid flowing through the flow path from leaking to the outside even when the portion of the diaphragm that contacts the opening edge of the valve box is torn, and the degree of tightening of the diaphragm. It is in providing the fluid controller which can confirm easily and reliably visually.

An example of a conventional general fluid controller will be described with reference to FIG.
The controller (A) expands and contracts the valve box (E) having an inlet channel (C) and an outlet channel (D), a valve body (J), a diaphragm (F), and the diaphragm (F). The diaphragm (F) is disposed on an opening (H) formed at a required position of the valve box (E) and is provided below the valve body (J). The clamping member (B) and the valve box (E) are fixed in a clamping state.

However, the conventional fluid controller (A) has the following problems.
First, when the inlet channel (C) and the outlet channel (D) are opened and closed via the diaphragm (F), the opening (H) formed in the valve box (E) of the diaphragm (F). Pressure is applied to the portion of the opening that is in contact with the opening edge (I), and therefore the inlet channel (C) and the outlet channel (D) are repeatedly opened and closed through the diaphragm (F). The portion of the diaphragm (F) that is in contact with the opening edge (I) of the opening (H) formed in the valve box (E) is cracked, whereby the inlet channel (C) and the outlet channel (D) ) May leak to the outside from the cracked portion.

Secondly, in such a fluid controller, the diaphragm is generally tightened using a torque wrench. However, since the diaphragm is made of an elastic material such as rubber, the measurement torque is stabilized. Therefore, it was difficult to tighten the diaphragm uniformly with moderate pressure.
Also, when tightening with a torque wrench, when assembling the fluid controller, forgetting to insert the diaphragm, using diaphragms or other parts with different dimensions and types, or foreign objects getting stuck in the diaphragm mounting part. Even if the measured torque value is an appropriate value, it is judged that the proper tightening has been obtained, so it is possible to grasp this even if the proper product is not actually obtained. There was a problem that I could not.

  In view of the problems of the conventional fluid controller as described above, even if the portion of the diaphragm that contacts the opening edge of the valve box is torn, the fluid flowing through the inlet channel and the outlet channel leaks to the outside. There has been proposed a fluid controller that prevents this (see Patent Document 1).

Japanese Unexamined Patent Publication No. Hei 6-272777

  However, the invention described in Patent Document 1 merely allows the former problem to be solved among the problems of the conventional fluid controller described above, and the latter problem is not specific. It did not disclose or suggest a practical solution.

  The present invention has been made in view of such circumstances, and even when the portion of the diaphragm that contacts the opening edge of the valve box is cracked, the fluid flowing through the flow path does not leak to the outside, and at the same time, the diaphragm It is an object of the present invention to provide a fluid controller capable of easily and surely confirming the degree of tightening of the material.

The invention according to claim 1 is fixed to a valve box having an inlet channel and an outlet channel, a valve body, and a sandwiched state between the valve box and the valve body via a clamping member. A fluid controller comprising a diaphragm and an operation mechanism for expanding and contracting the diaphragm, wherein the valve box abuts against a peripheral side surface of the clamping member and seals the inlet and outlet channels. The sandwiching member is inserted into a recess surrounded by the sealing projection, and the bottom surface of the sandwiching member is not in contact with the top surface of the sealing projection. The upper end portion of the peripheral side surface of the clamping member is positioned above the upper end surface of the sealing projection, and the peripheral side surface of the clamping member has a depth that the peripheral side surface enters the recess. It is provided with an indicator that can visually check Body controller on.
The invention according to claim 2 relates to the fluid controller according to claim 1, wherein the indicator includes a scale line.
The invention according to claim 3 relates to the fluid controller according to claim 1, wherein the indicator comprises a plurality of layers of different colors.

  As described above in detail, according to the fluid controller according to the present invention, the fluid flowing through the flow path does not leak to the outside even when the portion of the diaphragm that contacts the opening edge of the valve box is torn. Since the degree of tightening of the diaphragm can be easily and accurately confirmed visually, the tightening pressure of the diaphragm can always be adjusted and maintained within an appropriate range.

Hereinafter, preferred embodiments of a fluid controller according to the present invention will be described with reference to the drawings.
1 is a cross-sectional explanatory view showing an embodiment of a fluid controller according to the present invention, FIG. 2 is a cross-sectional explanatory view showing a sandwiching portion of a diaphragm in the fluid controller shown in FIG. 1, and FIG. 3 is a fluid shown in FIG. It is a figure which expands and shows the indicator part in a controller.

  (1) is a fluid controller, and the fluid controller (1) includes a valve box (19), a valve body (2), a diaphragm (6), a clamping member (7), and a compressor (12). And a stem (13), an actuator cap (8), and a spring (9).

  The valve box (19) is provided with an inlet channel (3) and an outlet channel (4), and a seal seat (13) positioned between the inlet channel (3) and the outlet channel (4). An opening (5) is formed at a required position of the valve box (19). Moreover, as shown in FIG. 2, the valve box (19) is formed with an endless sealing projection (11) that comes into contact with the peripheral side surface (10) of the clamping member (7).

A rectangular sheet-like diaphragm (6) is disposed above the opening (5) formed at a required position of the valve box (19).
In the present invention, the diaphragm (6) is not particularly limited, and conventionally known natural rubber, nitrile rubber, styrene rubber, butadiene / isobutylene synthetic rubber, polychloroprene having excellent heat resistance, cold resistance, flexibility, and corrosivity. Those made of rubber such as rubber, butyl rubber, fluorine rubber, silicon rubber and polyurethane rubber or synthetic resin such as polytetrafluoroethylene (PTFE) are preferably used.

  The compressor (12) is connected to the connecting bolt (18) in the axial direction, and the tip of the connecting bolt (18) is embedded in the embedded portion (15) in the center of the diaphragm (6).

In the gap between the valve box (19) and the valve body (2), the diaphragm (6) is fixed in a pinched state via a pinching member (7). At this time, the sealing projection (11) formed on the valve box (19) is brought into contact with the peripheral side surface (10) of the clamping member (7).
The sealing protrusion (11) formed on the valve box (19) does not contact the entire peripheral side surface (10) of the clamping member (7), and at least the upper end portion of the peripheral side surface (10) It is comprised so that it may expose from a sealing protrusion (11).

  That is, in the fluid controller (1) according to the present invention, the clamping member (7) enters the recess (20) of the valve box (19) surrounded by the sealing protrusion (11), and the clamping member The lower surface of (7) contacts the upper surface of the diaphragm (6) without contacting the upper surface of the sealing projection (11), and the upper end of the peripheral side surface of the clamping member (7) is the sealing projection (11). It is located above the upper end surface.

  The peripheral side surface (10) of the clamping member (7) is provided with an indicator (21) that can visually check the depth of the depth at which the peripheral side surface enters the recess (20). .

Although the form of an indicator (21) is not specifically limited, For example, the form shown in FIG. 3 can be illustrated.
FIGS. 3A and 3B show a configuration in which the indicator (21) has a plurality of horizontal scale lines parallel to each other. FIG. 3A shows a case where two scale lines are provided (b) ) Shows a case where three scale lines are provided. The number of scale lines is not particularly limited, and may be one or four or more.
In the case of (a), the upper surface of the sealing projection (11) is positioned between the upper graduation line (21a) and the lower graduation line (21b) when the diaphragm clamping pressure is in an appropriate range. By setting it to, it becomes possible to determine whether or not the tightening pressure is in an appropriate range at a glance by visual observation.
In the case of (b), in addition to the scale line of (a), an intermediate scale line (21c) representing the optimum tightening pressure is shown between the upper scale line (21a) and the lower scale line (21b). The diaphragm can be tightened with a more appropriate tightening pressure.

FIG. 3 (c) shows a configuration in which the indicator (21) is formed from a plurality of layers of different colors arranged in parallel to each other in the horizontal direction, and the illustrated example shows a case where the color layers are three layers. Yes. The number of color layers is not particularly limited, and may be two layers or four or more layers.
In this case, the position of the upper surface of the sealing protrusion (11) is such that the upper layer (21d) when the diaphragm clamping pressure is excessive, the intermediate layer (21e) when the clamping pressure is in an appropriate range, and the clamping pressure. By setting the position so as to be positioned in the lower layer (21f) when there is a shortage, it is possible to determine at a glance whether the tightening pressure is within an appropriate range.

A use state of the fluid controller (1) configured as described above will be described.
When closing the inlet channel (3) and the outlet channel (4), the diaphragm (6) is moved to the periphery by lowering the compressor (12) fixed under the stem (14) by the spring (9). The portion is clamped and clamped by the tip of the clamping member (7), and is pressed against the seal seat (13) of the valve box (19) to close the inlet channel (3) and the outlet channel (4).
Further, when air is introduced from the inlet port (16) through the air passage (17), the compressor (12) fixed under the stem (14) is raised, and the diaphragm (6) is moved to the seal seat (13). The inlet channel (3) and the outlet channel (4) are opened further apart.
In the illustrated example, the inlet channel (3) and the outlet channel (4) are closed by the fluid controller (1).

In the present invention, the inlet channel (3) and the outlet channel (4) may be manually opened and closed.
In the present embodiment, the operation mechanism for expanding and contracting the diaphragm (6) is configured as described above. However, the present invention is not limited to this operation mechanism, and other operation mechanisms may be used.

  In this way, the diaphragm (6) is fixed to the gap between the valve box (19) and the valve body (2) via the clamping member (7), and the endless shape formed on the valve box (19) is also provided. Since the sealing projection (11) is in contact with the peripheral side surface (10) of the clamping member (7), the inlet channel (3) and the outlet channel (4) are connected via the diaphragm (6). Even when the opening (5) formed in the valve box (19) of the diaphragm (6) is in contact with the opening edge (19) while being repeatedly opened and closed, The inside of the inlet channel (3) and the outlet channel (4) can be sealed by the stop projection (11), and the fluid flowing through the inlet channel (3) and the outlet channel (4) is externally There is no leakage.

  In addition, the holding member (7) is inserted into the recess surrounded by the sealing protrusion (11), and the lower surface of the holding member (7) is not in contact with the upper surface of the sealing protrusion (11). Since it is in contact with the upper surface of (6), it is possible to easily and accurately position the valve body (2) with respect to the valve box (19). It is also possible to perform tightening adjustment (reinforcement) on the diaphragm (6).

  Further, the upper end portion of the peripheral side surface (10) of the clamping member (7) is located above the upper end surface of the sealing projection (11), and the peripheral side surface of the peripheral surface of the clamping member (7) is An indicator (21) that can visually check the depth of the recess (20) is provided over the entire circumference, so that the degree of tightening of the diaphragm (6) and whether or not it is tightened can be visually observed from above. Can be confirmed easily and accurately.

It is a section explanatory view showing one example of a fluid controller concerning the present invention. FIG. 2 is an explanatory cross-sectional view showing a sandwiched portion of the diaphragm shown in FIG. 1. It is a figure which expands and shows the indicator part in the fluid controller of FIG. It is sectional explanatory drawing which shows the conventional fluid controller.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Fluid controller 2 Valve body 3 Inlet flow path 4 Outlet flow path 6 Diaphragm 7 Holding member 10 Peripheral side surface 11 Sealing protrusion 19 Valve box 20 Recessed part 21 Indicator

Claims (3)

A valve box having an inlet channel and an outlet channel, a valve body, a diaphragm fixed in a sandwiched state via a clamping member in a gap between the valve box and the valve body, and expanding and contracting the diaphragm The valve box is formed with an endless sealing protrusion that contacts the peripheral side surface of the clamping member and seals the inlet channel and the outlet channel. The sandwiching member enters the recess surrounded by the sealing projection, and the bottom surface of the sandwiching member abuts on the top surface of the diaphragm without contacting the top surface of the sealing projection, and the periphery of the sandwiching member The upper end portion of the side surface is located above the upper end surface of the sealing projection, and the peripheral side surface of the clamping member is provided with an indicator that allows visual confirmation of the degree of depth of the peripheral side surface entering the recess. A fluid controller characterized by comprising The fluid controller according to claim 1, wherein the indicator is a scale line. The fluid controller according to claim 1, wherein the indicator includes a plurality of layers of different colors.

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