JPS63140190A - Pneumatic actuating valve - Google Patents

Abstract

PURPOSE:To prevent accumulation of manufacturing errors of respective parts by forming a thick valve disc face in the direction of opening and closing for machining the same by optional volume after assembling the valve disc to make the same in desired dimension together with forming a holding portion on the valve disc for connecting the same to a machine tool. CONSTITUTION:A driving portion, which has O-ring (2), (8), (9) and the like easy to be broken through washing strongly, can be cleaned with simple washing process even in the case of washing strongly a passing through member (27), in which clean fluid flows through, by separating a passing through member (27) from a driving portion composed of a cylinder (1), piston (10), (11) and so on with a diaphragm (34). On this pneumatic actuating valve, a valve disc (38) fixed to a member body (30) is formed to be thick on the upper portion of a supporter (32) which holds the diaphragm (34) and an engaging flange (35) between the member body (30) and itself, together with forming a holding portion (33) having thread and, after assembling these members, the bottom face of the valve disc (38) is machined by optional volume and thereby accuracy can be increased.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an air-operated valve for controlling the supply of clean fluid to various purpose devices operated using fluid. It makes it easy to clean the parts, prevents contamination of the cleaning fluid during use, and accurately transmits the piston rod operation to the valve part, greatly simplifying the labor involved in the work 1Y. The aim is to improve machining accuracy by

Conventional technology Conventional air-operated valves use the biasing force of a piston that is biased in a certain direction to constantly open a fluid flow path in a valve section provided on a piston rod, and also sense open/close signals to increase air pressure. By applying force to the piston against the biasing force,
A normally closed air-operated valve that changes the fluid flow path from normally open to closed, and a valve section provided on the piston rod that normally closes the fluid flow path and senses open/close signals using the biasing force of the piston. There are normally closed air-operated valves that change the fluid flow path from normally closed to open by applying air pressure to a piston against a biasing force. When this air-operated valve controls the flow of fluid, such as when using pure water such as that used for ICC water flushing, or when passing pure gas, take care to prevent contamination by dust, etc. Therefore, it is necessary to ensure that the parts are cleaned before assembly. However, since many soft elastic members such as O-rings are used in the valve member, if strong cleaning is performed using ultrasonic waves or the like, these soft elastic members will be destroyed by the ultrasonic waves, which is not preferable. In addition, if soft elastic materials such as O-rings are separated and cleaned, the O-rings and other components must be assembled, which increases the number of times the parts come into contact with each other during assembly. Ta.

In order to eliminate such drawbacks,
-109973 and JP-A No. 61-130682, the piston rod is equipped with a piston port/7D having an O-ring etc. that may be damaged by ultrasonic cleaning.
Manufacturing 11, 'f1. A flow member that comes into contact with clean fluid and is not likely to be damaged by ultrasonic cleaning, such as an O-ring, is formed as a separate member. ': A method in which the piston rod and the circulation member are subjected to the cleaning step 11 separately, thereby reliably cleaning the circulation member that comes into contact with the clean liquid content, and then assembling and connecting the piston rod and the circulation member. It has been known. However, if it is necessary to shorten the opening/closing stroke of the valve part, for example, if only an opening/closing stroke of about 0.5 am is possible, it is possible to assemble and connect the piston rod and the circulation member to form a single piston rod. , the piston, the fixing ring, each member for connection, the abutting position between the members, etc., are connected, and even if there is a slight manufacturing error for each member, when they are assembled, , becomes large, and with the addition of errors during assembly, sagging, etc., the opening/closing stroke of about 0.5...+n is either absorbed or multiplied many times, making it impossible to open and close the valve part. There was a high possibility that it would become a reality.

Problems to be Solved by the Invention The present invention solves the above-mentioned drawbacks and eliminates the problem with the air-operated valve, and the piston rod direction has O-rings and the like that are likely to be damaged by ultrasonic cleaning. The flow member, which comes into contact with clean fluid and has no risk of being damaged by ultrasonic cleaning, such as an O-ring, is formed as a separate member, and the cleaning work during manufacturing is performed separately for the piston rod and the flow member. This makes it possible to reliably clean the circulation member that comes into contact with the clean content liquid, prevent contamination of the clean cleaning liquid, pure gas, etc., and eliminate the need to assemble and connect the piston rod and the circulation member. , the opening/closing part can be reliably opened and closed by the valve part with a small stroke without absorbing the opening/closing stroke due to the assembly and connection of the flow member and the piston rod.

Moreover, it is possible to obtain a high-precision product without requiring much effort in manufacturing and assembling these members, and it is intended to be able to sufficiently handle even minute opening/closing strokes.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention uses a biasing force of a piston that is biased in a certain direction to always open or close a fluid flow path in a valve portion. When a fluid flow path is changed from a normally open state to a closed state or from a normally closed state to an open state by sensing an open/close signal and applying air pressure to the piston against a biasing force, the piston and the piston are moved in the direction of the flow path. A holding part is formed in the circulation member which is formed to be able to move forward and backward separately, and a holding part is formed to connect it to a machine tool during machining work, and a valve part is connected facing the opening/closing part of the flow path, and the opening/closing part of this valve part It is made thicker by at least the estimated cutting amount so that the directional surface can be cut by an arbitrary amount.

Function As described above, the present invention involves forming the piston rod in the air pressure introduction direction and the circulation member in the flow path direction separately, so the circulation member that comes into contact with clean fluid must be reliably cleaned before assembly. be able to. In addition, during assembly, there is no need to connect the piston port/socket to the flow member, and the flow path side of the valve part is made thicker by at least the expected amount of cutting so that the face in the direction of the flow path can be cut by an arbitrary amount. After assembling, by holding the holding part of the circulation member in a machine tool and cutting the valve part, the overall dimensions of the circulation member made of a combination of multiple parts can be precisely determined, Even if the individual dimensions of the flow member and related members are non-uniform, it is possible to produce minute and accurate opening/closing strokes of the valve part, and as in the past, all parts connected to the piston rod can be It is no longer necessary to strictly manufacture and assemble the parts, and it is possible to obtain a product at low cost and with no variation.F) Therefore, by installing a metal diaphragm, etc., the movement stroke of the valve part can be reduced. Even with very little energy, it is possible to open and close the valve reliably. When a closing signal is detected, air pressure is applied to the piston against the biasing force. In a normally open air-operated valve, the piston presses the flow member through the piston rod, so the valve The fluid flow path is changed from normally open to closed depending on the section.

In addition, in a normally closed air flE valve, when an open signal is detected, air pressure is applied to the piston against the biasing force to release the pressure on the circulation member l\ by the piston rod. The flow member moves in the direction of the piston rod by its own biasing force, opens the valve portion from the opening/closing portion, and changes the fluid flow path from the normally closed state to the open state.

Embodiment Below, one embodiment of the present invention will be described with reference to FIG.
〉 is a cylinder whose upper end is hermetically fixed by a sealing body (3) via an O-ring (2), and the top surface of this sealing body (3) is connected to a lid body (5) provided with a retaining protrusion (4). As a result, a controlled air inlet (6) is formed on the side surface in the axial direction. In addition, a piston rod (7) is inserted into the cylinder (1), and this piston rod (7)
On the outer circumference of the cylinder (1), on the inner circumference surface there is an O-ring (8).
(9), two pistons (10) (
11) is fixed, and the pistons (10) and (11) are airtightly divided by a separator (13) formed to protrude inward from the cylinder (1) in an annular shape, and the axial side surface of the cylinder (1) is Control fluid inlet (
6) are connected to two inlet chambers <14) and (15) formed on the negative faces of the two pistons (10 and 11), respectively. The control fluid is injected into these two inflow chambers (14) and (15) through an introduction path (16) formed in the piston rod (7) in the axial direction from the upper end surface,
In the embodiment shown in FIG.
An introduction path (16) is formed between the piston rod (10) and the sealing body (3), and is formed from the first inflow chamber (14) in the axial direction from the upper end of the piston rod (7). ,
It opens into the second inlet chamber (15).

Further, the cylinder (1) is rotatably fixed to the main body (17) by connecting and fixing one end to the main body (17) via a lock ring (18), and also connects the first piston (10) and the separator. A pressing spring (20) is inserted between (13), and by this pressing spring (20),
The first and second pistons (10) and (11) are biased toward the first and second inflow chambers (14) (1a), and are normally engaged with the engagement protruding from the outer periphery of the lower end of the piston rod (7). The joint (21) is connected to the inner cylinder (2) that protrudes inward from the main body (17).
2) is engaged with the end (23). through the inlet (6
) When control air is injected from the piston rod (7)
Control air flows in the direction of pressing the pistons (10) and (11) against the restoring force of the pressing spring (20) through the inlet passage (16) formed in the piston rod (7). Moving. Further, a connecting body (25) having a control fluid flow path (24) is provided on the inner periphery of the main body (17) with a threaded portion (26).
), and a flow member (27) that is formed to be movable forward and backward is inserted into this connecting body (25), separately from the piston rod (7).

This circulation member (27) is provided with a member main body (30) having a polygonal or triangular shape with a stop receiving portion (28) protruding from the outer periphery, and a screw portion (31) above the member main body (30). The holding body (32) is screwed and fixed through the holding body (32).
) is formed with a holding part (33) provided with a screw groove, and a metal diaphragm (34) made of a material such as stainless steel is formed between the holding body (32) and the member body (30).
and the engagement r-J (35) with the metal diaphragm <34
) on the member body (30) side, and the engaging collar (35) on the holding body (
32) side, and the annular pressing part (30) of the member body 30)
36) is clamped and fixed by being crimped to the metal diaphragm (34).

Further, a valve portion (38) that does not normally close the flow path (24) is fixed to the member body (30) facing the opening/closing portion (37) of the flow path (24). 38) is formed to have a thickness at least equal to the predicted amount of tl cutting so that an appropriate amount of cutting can be performed, and the member body (30) and the holder (32)
When the assembly of the engagement collar (35) and metal diaphragm (34) is completed, the jig (40) is screwed and fixed to the holding part (33), and this jig (40) is installed on a machine tool such as a lathe. If the valve part (38) is fixed to the chuck (41) and the surface of the valve part (38) is cut, the valve part (38) can be cut from the upper surface of the engaging collar (35) even if the dimensions of the above-mentioned members have low precision. The dimension (a) to the bottom surface of 38) can be set extremely IM-tightly, and the flow member (27) can be made highly accurate by simple machining means.

Next, the distribution member 27) removed from the jig (40) is
The outer periphery of the metal diaphragm (34) is located on the top surface of the connecting body (25), and the metal diaphragm (34) has a
An annular insertion member (42) is positioned and connected to the connecting body (2a) by a concave-convex fit in a non-rotatable manner, and the insertion member (42)
The inner peripheral protrusion (39) of the engaging collar (35) is brought into contact with the upper surface of the engaging collar (35). A restoring spring (44) is interposed between the inner circumferential protrusions (three) and the annular collar (43) fixed to the holding part (33), and the flow member (44) is inserted in the direction of the piston rod (7). 27) is energized. In addition, as mentioned above, the metal tire flam (
By positioning the pistons (10) and (11)
The direction and the direction of the flow path (24) are liquid-tightly divided to prevent the clean control fluid flowing through the flow path (24) from being contaminated by contact with the direction of the piston rod (7). Protecting. This #L diaphragm (34)
By installing this, the flow member (27) has a very limited movement stroke, which in one embodiment is 0.
It is approximately 5 mm. Then, the valve part (38) connected to the circulation member (27) opens and closes the opening/closing part (37) of the circulation passage (24>).
) in the open state, connect the circulation member (27) with the engaging flange (3).
5) and the insertion member (42) come into abutting contact due to the restoring force of the restoring spring <44).

To assemble the structure as described above, first, each member in the direction of the piston rod (7) and each member in the flow member (27>) are separately cleaned.
Particularly reliable is the flow member (27) and the connection member (25) that are in direct contact with the clean fluid, and each member in the direction of the piston rod (7) has a large number of O-rings (2) (8) in use. Clean as appropriate without damaging the parts. The piston rod (7) and the circulation member (27) that have been cleaned are assembled together with the basin member so that they are not connected to each other. Since this assembly is performed without connecting the piston rod (7) and the flow member (27), assembly is easy and a clean automatic n
The acupuncture can perform the engagement and fixing work, reducing the contact of each member that makes up the piston rod (7) during assembly work, and preventing the adhesion of dust on the circulation member (27V\) during assembly. make it possible to do.

Also, due to the installation of the metal diaphragm (34), the movable stroke is, in one embodiment, 0.511III+
The piston rod (7) will be slightly shorter and shorter.
Since the flow member (27) and the flow member (27) are formed separately, the flow member (27) is not affected by the dimensions of many members such as the piston rod (7), pistons (10), (11), etc. As mentioned above, if the valve part (38) is cut after assembly, precise dimensions can be ensured, so the dimensions of the upright part (46) of the connecting body (25) and the insertion member (42) are If it is manufactured and assembled accurately, the opening interval (47) formed between the valve part (38) and the opening/closing part (37) will naturally be formed accurately, and all of the many parts as in the past. The valve part (38) is actuated by absorbing the travel stroke corresponding to the opening interval (47), which eliminates waste and improves the reliability of the product. It is possible to prevent accidents such as being unable to move the valve, and to reliably operate the valve portion (38) with an extremely small movement stroke of about 0.5 treble.

To explain the operation of the air-operated valve configured as described above, the pistons (10) and (11) are normally operated by the pressing spring (20).
Due to the biasing force on the piston rod (7), the flow member (
27), the flow member (27) always keeps the valve portion (38) open by the restoring force of the restoring spring (44). And if the closing signal is detected,
Control driftwood is introduced from the control fluid inlet (6) opened in the cylinder (1) into the two inflow chambers (14) (1'5) formed between the two pistons (10) (11). When it flows in, the controlled driftwood pressure is applied to the two pistons (10) and (11), and the pressure receiving area of the pistons (10 and 11) is -
Compared to the case of screws 1 to 1, the output is nearly twice as large, and the flow member (27
), it presses the flow member (27) against the restoring force of the restoring spring (44), and even when the fluid flowing through the flow path (24) is at high pressure, the valve part ( The opening/closing part (37) of the flow path (24) can be closed at 38).

In the above embodiments, an embodiment in which the present invention is used as a normally open air-operated valve has been described. However, when the present invention is used as a normally-closed air-operated valve, as shown in FIG. ) is installed between the piston (10) and the closed body (3), and the flow member (27) is pressed in the direction of closing the flow path (24) with the pressing end surface (45) of the piston rod (7). The opening/closing part (37) is always kept closed by the valve part (38). In this closed state, if the open interval (48) formed between the circulation member (27) and the insertion member (42) is strictly formed, by installing the metal diaphragm (34), The movement stroke of the valve part (38) is
Enables reliable opening/closing of valves even in extremely rare situations. When the release signal is detected, the air pressure is suppressed (20
) is applied to the pistons (10) and (11) against the urging force of
By doing so, the circulation member (
While releasing the pressure on the piston rod (7), the circulation member (27) is moved by the urging force of the restoring spring (44) to the piston rod (7).
direction, the valve portion (38) is opened from the opening/closing portion (37), and the fluid flow path (24) is changed from the normally closed state to the open state.

Effects of the Invention As described above, the present invention provides a piston rod having an O-ring, etc., which may be damaged by ultrasonic cleaning, and a clean fluid that comes into contact with the piston rod, which has an O-ring, etc., which may be damaged by ultrasonic cleaning. By forming the flow member with and without the flow member as separate members and performing the cleaning work on the piston rod and the flow member separately during manufacturing, it is possible to ensure that the flow member comes into contact with clean content liquid. without causing contamination of the cleaning solution.

In addition, even if the movable stroke of the valve part is shortened due to the installation of a metal diaphragm, etc., the piston rod and the flow member are formed separately, so many parts such as the piston rod, piston, fixed ring, etc. It is not affected by dimensions, and since the valve part is machined after assembly, the flow member is formed between the valve part and the opening/closing part, even if the machining accuracy of each component is relatively low. The open intervals will naturally be formed accurately, making it possible to obtain a product with high reliability at a low price.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a cross-sectional view of a normally open air-operated valve; FIG. 2 is a cross-sectional view of a normally open air-operated valve;
FIG. 3 is an enlarged cross-sectional view of the flow member, and FIG. ... Piston (24) ... Flow path (27) ... Flow member (3
0)...Main body 33)...Holding part <34)
...Metal diaphragm (35) ...Engagement flange (37) ...Opening/closing part (3
8)... Valve part (42)... Insertion member (43)
...Ring tsuba (44), restoration spring (47) (4
8)... Open space box 1 Figure 2 Figure 3 Figure 4

Claims (6)

[Claims] (1) Due to the biasing force of the piston that is biased in a certain direction,
By setting the fluid flow path normally open or always closed at the valve part and sensing the open/close signal and applying air pressure to the piston against the biasing force, the fluid flow path can be changed from normally open to closed or from normally closed to open. In terms of the condition,
A holding part for connecting to a machine tool during machining work is formed on a circulation member that is formed to be able to advance and retreat separately from the piston rod in the direction of the flow passage, and a valve part is connected to the circulation member facing the opening/closing part of the circulation passage. An air-operated valve characterized in that the valve portion is made thicker by at least an estimated amount of cutting so that the opening/closing portion direction surface of the valve portion can be cut by an arbitrary amount. (2) The circulation member applies a biasing force toward the piston rod by interposing a restoring spring between the annular collar of the circulation member fixed to the holding part and the insertion member slidably inserted through the circulation member. 2. The air-operated valve according to claim 1, wherein the air-operated valve is formed of an air-operated valve. (3) An engaging flange is protruded from the outer periphery of the circulation member, and this engaging flange is positioned facing the opposite side of the insertion member from where the restoring spring is installed, and a metal diaphragm is placed between the engaging flange and the member body. 3. The air-operated valve according to claim 2, wherein the center of the air-operated valve is clamped and fixed. (4) The outer periphery of the metal diaphragm, whose center part is clamped and fixed between the engagement flange of the circulation member and the member body, is inserted and fixed between the circulation member and the insertion member, and the piston direction and the flow path direction are liquid-tightly divided. 3. The air-operated valve according to claim 2, wherein the air-operated valve is characterized in that: (5) In a normally open air-operated valve, when the valve portion of the flow member opens the opening/closing portion of the flow path, the engaging collar of the flow member and the insertion member are pressed into contact by the restoring force of the restoring spring. 3. The air-operated valve according to claim 2, wherein the air-operated valve is characterized in that: (6) In a normally closed air-operated valve, when the valve part connected to the circulation member closes the opening/closing part of the circulation passage, an open interval is formed between the engaging collar of the circulation member and the insertion member. 3. The air-operated valve according to claim 2, wherein the air-operated valve is