JPH0542590B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an air-operated valve for controlling the supply of clean fluid to various purpose devices operated using fluid, and for controlling the supply of clean fluid to various purpose devices operated using fluid. This makes it easy to clean the parts and prevents contamination of the cleaning fluid during use.

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 the piston, and also sense abnormal pressure of the fluid and apply air pressure. A normally open air-operated valve changes the fluid flow path from normally open to closed by applying force to the piston, and a normally open air-operated valve changes the fluid flow path from normally open to closed by applying force to the piston, and a valve part provided on the piston that normally controls fluid flow by the biasing force of the piston. There is a normally closed air-operated valve that constantly closes the fluid flow path and senses abnormal fluid pressure and applies air pressure to the piston against a biasing force, thereby changing the fluid flow path from normally closed to open. do. When using pure water, such as that used for cleaning IC boards, as the fluid that this air-operated valve controls the flow of, in order to prevent contamination with dust, etc.,
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, etc., these soft elastic members will be destroyed by the ultrasonic waves. do not have. Furthermore, if a soft elastic material such as an O-ring is separated and cleaned, the necessity of assembling the O-ring increases the number of times the component is contacted during assembly, and this has the disadvantage that more dust and the like will adhere to it.

Problems to be Solved by the Invention The present invention relates to an air-operated valve that eliminates the above-mentioned drawbacks, and the piston rod has an O-ring, etc. that may be damaged by ultrasonic cleaning. One member and the other member, which comes into contact with clean fluid and is not likely to be damaged by ultrasonic cleaning, such as an O-ring, are made of separate members, and cleaning work during manufacturing can be done by separating one member and the other member. By performing this separately, the other member that comes into contact with the clean content liquid can be reliably cleaned, and the cleaning liquid can be prevented from being contaminated, and the assembly work can be simplified by using a one-touch stopper. This reduces contact with the parts that make up the piston during assembly work,
This is intended to prevent the possibility of dust buildup during assembly.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention uses the biasing force of the piston that is biased in one direction to constantly open the fluid flow path or By keeping the piston closed at all times and sensing abnormal fluid pressure 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. The piston rod is formed of one member in the air pressure introducing direction and the other member in the flow path direction, and the one member and the other member are connected by a one-touch fastener.

Effect Since the present invention is configured as described above,
In a normally open air-operated valve, the biasing force of the piston keeps the fluid flow passage open at the valve connected to the piston, and if abnormal pressure of the fluid is detected, the air pressure is increased against the biasing force. By joining the piston, the fluid flow path is changed from normally open to closed. In addition, in the case of a normally closed air-operated valve, the biasing force of the piston causes the valve section connected to the piston to always close the fluid flow passage, and when abnormal pressure of the fluid is detected, the air pressure is applied against the biasing force. By applying the fluid to the piston, the fluid flow path is changed from a closed state to an open state. Also, the piston rod,
Since the one member in the air pressure introduction direction and the other member in the flow path direction are formed separately, the other member that comes into contact with clean fluid can be reliably cleaned, and one member and the other member can be connected with one touch. By connecting with a stopper, assembly work can be simplified, and the parts that make up the piston,
It is possible to reduce contact during assembly work and prevent dust from adhering during assembly.

Embodiment An embodiment in which the present invention is applied to a normally open air-operated valve will be described below with reference to FIG. A piston rod 4 consisting of a piston rod 4 is fixed in the center and is biased in a certain direction by a pressing spring 6 interposed between the piston rod 4 and the main body 5. This piston 1 is slidably attached to a cylindrical casing 8 via an O-ring 7, and an air injection tube is attached to a portion of the axial side surface of the casing 8 corresponding to the outer surface of the piston 1 in the urging direction. A control air inlet 11 is formed to connect the casing 8 to the casing 8.
One end is connected and fixed to the main body 5 via a lock ring 12 so that it can rotate with respect to the main body 5, and a lid pair 15 is rotatably connected to the opening 13 at the other end of the casing 8 via a connecting lock ring 14. It is sealed by fixing it freely. Also, the main body 5
A connecting body 17 having a control fluid flow path 16 is screwed and fixed to the inner periphery of the piston rod 4 through a threaded portion 18, and a piston rod 4 is inserted into the connecting body 17, and a valve provided at the end of the piston rod 4 is inserted into the connecting body 17. The portion 20 is located so as to face the opening/closing portion 21 of the flow path 16 so that the flow path 16 is not normally closed.

Also, on the outer periphery of the other member 3 of the piston rod 4,
One side of the member 2 is partially covered with a bellows 22 to protect the clean control fluid flowing through the flow path 16 from being contaminated by the connection with the piston rod 4. This bellows 22 has one end fixed to a flange portion 23 protruding from the outer periphery of the other member 3 of the piston rod 4, and is slidably located on the outer periphery of the other member 3 of the piston rod 4. By fixing the other end of the bellows 22 to the sleeve 24 fixed to the other member 3 of the piston rod 4,
is covered. Further, the connection between the other member 3 and the one member 2 is performed by a one-touch stopper 25,
This one-touch stopper 25 is as shown in FIG.
Using a cylindrical body 27 with a split groove 26 in the axial direction on one side, inserting an insertion post 28 protruding from the end of the one member 2 into the cylindrical body 27. By inserting the cylindrical body 27 into the insertion receiving part 30 of the other member 3, which has a small inner diameter, and pressing the cylindrical body 27 to the inner peripheral surface of the insertion receiving part 30, the one member 2 and the other member 3 can be connected with one touch. can do.

Further, on the side surface of the casing 8 on the pressure spring 6 side, there is an intake/exhaust port 3 for gas as the piston 1 moves forward and backward.
1 is formed. The casing 8 is formed so that the shape in the upright state as shown in FIG. 1 and the shape when the upright state is turned upside down and half turned as shown in FIG. 2 are symmetrical. Then,
It can also be used as the casing 8 of the normally closed air-operated valve shown in FIG.

In the structure as described above, in order to assemble the piston rod 4, a one-touch operation consisting of the cylindrical body 27 in which the insertion column 28 is inserted into the insertion receiving portion 30 of the other member 3, which has been thoroughly cleaned in advance, is performed. Stop 25
By press-fitting, the one member 2 and the other member 3 are connected, and the piston rod 4 can be formed.

Next, to explain its function as an air-operated valve, the valve portion 20 of the piston rod 4 always opens the flow path 16 for the control fluid due to the urging force applied to the piston 1 by the pressure spring 6, and the valve portion 20 for the control fluid When abnormal pressure is detected, air pressure is applied to the piston 1 from the air injection pipe 10 through the injection port 11 against the biasing force, and the opening/closing portion 21 of the flow path 16 is opened by the valve portion 20. Close.

In the above embodiment, 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, the casing 8 may be placed in an upright position as shown in FIG. As shown in FIG. 2, by turning the lid 15 upside down and half a turn, the part where the lid 15 was fixed in the above embodiment is fixed to the main body 5 with the lock ring 12, and the lid 15 is fixed to the upper end. By interposing the pressure spring 6 between the lid body 15 and the piston 1 and constantly pressing and closing the valve portion 20 against the opening/closing portion 21 of the flow path 16, it can be used as a normally closed air-operated valve. When this normally-closed air-operated valve senses abnormal fluid pressure, the air pressure is applied to the inlet 11 against the urging force of the pressing spring 6.
By applying the fluid to the piston 1, the fluid flow path 16 is changed from a closed state to an open state. In addition, since the dimensions of the piston rod 4 are slightly different from those of normally open air operated valves and all other parts can be shared, it is possible to reduce the number of parts and obtain inexpensive products for normally closed and normally open air operated valves. be able to.

Further, in the above embodiment, the one-touch stopper 25 used a cylindrical body 27 provided with a groove 26, but in other embodiments, as shown in FIGS. 4 and 5,
It is formed using a C-ring 33 provided with a Daruma-shaped insertion stop 32. When using this C-ring 33, as shown in FIG.
Connect the insertion receiving part 30 and the insertion column 28 by
One member 2 and the other member 3 are fixed.

In another different embodiment, as shown in FIGS. 6 and 7, a C-ring 34 having a missing circular shape is used as the one-touch stopper 25, and this C-ring 34 is connected to the insertion column. The insertion post 28 is fixed to the outer surface of the insertion receiving part 30 with the outer peripheral part protruding, and the insertion post 28 is driven and inserted into the insertion receiving part 30 with the inner surface of the opening 35 being a tapered surface. The one member 2 and the other member 3 are connected and fixed by fixing the outer peripheral portion of the member.

In yet another embodiment, the one-touch stopper 25 is attached to the C-rings 33, 34 and the cylindrical body 2.
7, etc., as shown in FIG. It may be formed by engaging with the engagement receiving portion 37 formed in the above.

Effects of the Invention As described above, the present invention allows a piston rod to be brought into contact with one member having an O-ring, etc., which is likely to be damaged by ultrasonic cleaning, and a clean fluid to remove the O-ring, etc. by ultrasonic cleaning. By forming the other member and the other member separately so that there is no risk of damage, and performing cleaning work on one member and the other member separately during manufacturing, the other member that comes into contact with the clean content liquid can be reliably cleaned. By using a one-touch stopper and simplifying assembly work, we can reduce the amount of contact with the parts that make up the piston during assembly work, and prevent contamination of the cleaning solution. This can prevent the possibility of dust adhesion.

[Brief explanation of the drawing]

The drawings show embodiments of the present invention; FIG. 1 is a cross-sectional view when used in a normally open air-operated valve, FIG. 2 is a cross-sectional view when used in a normally closed air-operated valve, and FIG. 3 is a cross-sectional view when used in a normally closed air-operated valve. A perspective view of the one-touch fastener, FIG. 4 is a cross-sectional view showing another example of connection between one member and the other member, FIG. 5 is a plan view of the one-touch fastener used in FIG. 4, and FIG. 6 is one member. 7 is a plan view of the one-touch stopper used in FIG. 6, and FIG. 8 is a sectional view showing still different embodiments of the connection between one member and the other member. . DESCRIPTION OF SYMBOLS 1... Piston, 2... One member, 3... Other member, 4... Piston rod, 16... Flow path,
20... Valve portion, 22... Bellows, 25... One touch stopper, 27... Cylindrical body, 26, 38... Division groove, 36... Engaging protrusion, 33, 34... C ring.

Claims (1)

[Claims] 1. By the urging force of the piston that is urged in a certain direction, a valve section provided on the piston always opens or always closes the fluid flow path, and also detects abnormal pressure of the fluid and adjusts the air pressure. In a device that changes a fluid flow passage from a normally open state to a closed state or from a normally closed state to an open state by applying force to the piston against an urging force, the piston rod is connected to one member in the air pressure introducing direction and the other member in the direction of the flow path. An air-operated valve characterized in that the other member is formed of the other member, and the one member and the other member are connected by a one-touch stopper. 2. The air-operated valve according to claim 1, wherein the outer periphery of the other member is covered with a bellows. 3. The air-operated valve according to claim 1 or 2, wherein the one-touch stopper is formed of a C-ring. 4. The air-operated valve according to claim 1 or 2, wherein the one-touch stopper is formed of a cylindrical body with a groove provided in the axial direction. 5. The one-touch stopper is characterized in that a split groove is formed in the axial direction from one end of the one member, and an engaging protrusion is formed on the outer periphery of the split groove forming portion. The air-operated valve according to paragraph 2.