JP2020172967A - Valve with gas purge function - Google Patents

Abstract

To provide a valve with a gas purge function for a fluid channel which can introduce a purge gas without using a gas purge pipe to solve a problem that is caused when installing both of a valve for a fluid channel and a gas purge pipe.SOLUTION: A valve with a gas purge function includes a valve body 2, a valve stem 3, a valve element 4, a valve seat 5 and an operation member 6. In the valve, the valve stem 3 includes a gas purge hole 10 with an inlet port opened to the outside the valve body 2. An outlet port of the gas purge hole 10 is opened to a recess part 11 provided in a tip of the valve element 4. The recess part 11 is assembled with a porous member 13 that allows a gas to pass but blocks liquid from passing therethrough.SELECTED DRAWING: Figure 1

Description

The present invention relates to a valve for shutting off / opening / opening a fluid passage provided in a pipe or a tank, and more particularly to a valve having a gas purging function having a function of introducing a purging gas into the pipe or the tank.

Conventionally, a valve for shutting off, opening, and opening a fluid passage through which a fluid (liquid or fluid) passes and a gas purge pipe for introducing purge gas into a pipe or a tank have been used in combination of independent valves. This is because there was no valve with a gas purge function.

The valve for purging is shown, for example, in Patent Document 1 below, which is a valve attached to a gas purge pipe to shut off / open the flow of purge gas, and shuts off / opens / opens the fluid passage. It is not a control valve (hereinafter referred to as a valve for fluid passage).

The gas purge pipe, which is separate from the valve for the fluid passage, is installed from the top of the tank to the bottom of the tank so that the liquid in the tank does not leak, for example, when introducing purge gas into the tank. It is inserted up to (until it is immersed in the liquid even when the liquid level position in the tank reaches the lower limit), and in a tank with a large capacity, especially the gas purge pipe is considerably long.

Japanese Unexamined Patent Publication No. 07-10334

When trying to install a valve for an independent fluid passage and a gas purge pipe in a narrow space, there were cases where the installation restrictions in terms of space could not meet the demands of the two.

In addition, long gas purge pipes that are attached to large-capacity tanks require strength.
Further, even when the fluid in the tank is reduced to the lower limit liquid level position, there is a problem that the length accuracy must be improved so as to be surely immersed in the fluid.

Further, when a gas purge pipe extending near the bottom of the tank is inserted into the tank, the gas purge pipe becomes an obstacle and the stirring blade cannot be freely installed in the tank. Performing gas purging while stirring the fluid in the tank with a stirring blade leads to improvement in gas purging efficiency, but this cannot be expected if there is a defect in the installation regulation of the stirring blade as described above.

An object of the present invention is to provide a valve with a gas purging function for a fluid passage that solves the above problems by allowing the introduction of purge gas without using a gas purge pipe.

In order to solve the above problems, in the present invention,
A valve body having a fluid passage with an inlet / outlet, a valve rod liquid-tightly and slidably inserted into the valve body, and a valve body provided at the tip of the valve body, and the valve body are brought into contact with each other. A valve provided with a valve seat provided on the valve body and an operating member for advancing and retreating the valve stem.
The valve stem has a gas purge hole inside.
The gas purge hole has an outlet in a recess provided at the tip of the valve body and an inlet having a connecting portion of a gas supply pipe opened to the outside of the valve body.
Provided is a valve with a gas purging function in which a porous member (a porous gas-liquid separating member) that allows gas to pass through and blocks the passage of liquid is incorporated in the recess of the valve body.

The porous member may be made of a single material of resin, metal, ceramics, organic fiber, inorganic fiber, or a composite material obtained by combining these materials. A porous member made of metal or ceramic can also be provided with a function of allowing gas to pass through, but blocking the passage of liquid or foreign matter, by subjecting it to a water repellent treatment or the like.

The porous member can be incorporated into the recess by the methods listed below.
1) A female screw is machined on the inner peripheral surface of the recess, and a bush screwed into the female screw is used, and a porous member is fitted and held in the bush.
2) A female screw is machined on the inner peripheral surface of the recess, the porous member is formed of a hard body such as a sintered body, and a male screw is machined on the outer circumference of the porous member, and the porous member is formed into the recess. Screw it in directly to fix it.
3) A presser plate with a hole into which a part of the porous member is fitted is fixed to the tip end side of the valve body with a screw, and the porous member is prevented from coming off from the recess and held by the presser plate.
4) A boss portion with a male screw machined on the outer circumference is provided so as to project from the tip of the valve body, the recess is machined in the boss portion, the porous member is inserted into the recess, and a union nut is formed in the boss portion. The holding member such as the above is screwed, and the holding member holds the porous member by preventing it from coming off from the recess.
5) The valve rod is provided with a small diameter built-in hole on the tip side reaching the inside of the valve body, the recess is provided on the tip side of the built-in hole, and the recess is provided from the rear side of the valve rod to the recess on the tip side of the built-in hole. A nipple for inserting the porous member and screwing it into the rear part of the built-in hole and a holding pipe to be inserted into the built-in hole are additionally added, and the holding pipe is pressed against the porous member with the nipple to press the porous member against the porous member. Fix it.

The operating member may be a manual type or a power driven type. The manual operation member is a member of a general form composed of a sleeve that is held so as to be rotatable at a fixed position and screwed into a male screw on the outer circumference of the valve stem, and a hand-cranked handle that engages with the sleeve. It's fine.

The power-driven operating member is a combination of a fluid pressure-driven cylinder that pushes and pulls the valve stem and a limit switch that controls the movement of the cylinder, a valve rod that is pushed and pulled by an electromagnetic valve, and a valve. Several forms are conceivable, such as a sleeve that is screwed into a rod and can rotate in a fixed position and is rotated by a motor.

The valve with a gas purge function of the present invention is provided with a gas purge hole in the valve stem, and a gas for purging can be introduced into the fluid passage from the outside through the gas purge hole.

Since a porous member that allows only gas to pass through is incorporated at the outlet of the gas purge hole, the fluid in the fluid passage does not flow out to the outside.

In this way, the valve for the fluid passage itself has the function of introducing the gas for purging into the fluid passage from the outside, so as long as the installation location of the valve can be secured, the fluid flow is shut off, opened, controlled and gas purged. Can be carried out.

Since a gas purge pipe independent of the valve is not required, it is not necessary to secure the strength and length accuracy to withstand the pressure and drag acting on the inner and outer surfaces, which are required for the conventional gas purge pipe.

Further, since the valve for the fluid passage is installed outside the tank and the valve provided outside the tank has a gas purging function, a stirring blade is provided inside the tank and the fluid in the tank is stirred by the stirring blade. While gas purging can be performed.

It is sectional drawing which shows an example of the valve with a gas purge function of this invention. It is sectional drawing which shows the other example of the valve with a gas purge function of this invention. It is a side view of the valve with a gas purge function of FIG. It is sectional drawing which shows still another example of the valve with a gas purge function of this invention. It is sectional drawing which shows an example of the attachment structure of a porous member. It is sectional drawing which shows another example of the attachment structure of a porous member. It is sectional drawing which shows still another example of the attachment structure of a porous member. It is sectional drawing which shows still another example of the attachment structure of a porous member. It is sectional drawing which shows still another example of the attachment structure of a porous member.

Hereinafter, embodiments of the valve with a gas purging function of the present invention will be described with reference to FIGS. 1 to 9 of the accompanying drawings. All of the illustrated valves with a gas purge function are used by being attached to the lower part of a tank or the like.

The valve 1 with a gas purge function of FIG. 1 is provided on a valve body (body) 2, a valve rod 3, a valve body 4 provided at the tip of the valve rod 3, and a valve body 2 that connects and separates the valve body 4. The valve seat 5 is provided with an operating member 6 that slides the valve rod 3 in the axial direction to displace the valve body 4.

In the figure, reference numeral 7 is a stem guide that supports the valve stem 3, reference numeral 8 is a ground seal portion that tightly seals the outer circumference of the valve stem 3, and reference numeral 9 is a rotation stopper portion of the valve stem 3.

The illustrated gland seal portion 8 is a well-known seal portion that combines a gland packing 8a, a gland follower 8b, a gland plate 8c, and a stud bolt and a nut 8d that apply a tightening force to the gland plate 8c.

The detent portion 9 is also a well-known mechanism that combines a stem lock 9a fixed to the valve stem 3, a roller 9b attached to the stem lock 9a, and a vertically long guide 9c provided on the upper part of the valve body 2. As the roller 9b rolls in the guide 9c, the valve stem 3 can move forward and backward in the axial direction without rotating.

The valve body 2 is provided with a fluid passage 2a inside. The fluid passage 2a has an inlet Ip and an outlet Op, and the shutoff, opening, and opening degree control of the fluid passage 2a is performed by a valve portion that combines the valve body 4 and the valve seat 5.

The operating member 6 that displaces the valve body 4 and brings it into contact with and detaches from the valve seat 5 includes a sleeve 6a screwed into a male screw 3a at the lower part of the valve stem 3 and a hand-cranked handle 6b fixed to the sleeve 6a. Illustrated. Reference numeral 6c is a washer interposed between the handle 6b and the lower end of the valve body 2, and reference numeral 6d is a lock nut screwed into the sleeve 6a.

The sleeve 6a rotates in a fixed position by operating the handle 6b, whereby the valve rod 3 slides in the axial direction and the valve body 4 at the tip of the valve rod 3 comes into contact with or separates from the valve seat 5. The size of the passage (valve opening) generated between the valve body 4 and the valve body 4 changes when the distance from 5 is increased. The operating member 6 is not limited to the manual type shown in the figure.

A gas purge hole 10 is provided inside the valve stem 3. The gas purge hole 10 has an outlet opened in a recess 11 provided at the tip of the valve body 4.

Further, the inlet of the gas purge hole 10 is open to the outside of the valve body 2 (that in the figure is the lower end of the valve stem 3; the end on the side where the operating member 6 is provided). At the inlet of the gas purge hole 10, a connecting portion 12 of a gas supply pipe (that in the figure is a tapered screw hole for a pipe) 12 is machined.

A porous member 13 is incorporated in the recess 11 at the tip of the valve body 4 to allow gas to pass through and prevent foreign matter such as liquid or fine particles from passing through.

The porous member 13 may be made of a single material of resin, metal, ceramics, organic fiber, or inorganic fiber, or a composite material obtained by combining these materials. The porous member 13 made of metal or ceramic is a sintered body having a porous structure, and by applying a water repellent treatment to the sintered body, a function of allowing gas to pass through but blocking the passage of liquid or foreign matter is imparted. be able to.

The porous member 13 can be incorporated into the recess 11 by the method shown in FIGS. 5 to 9. In the assembly structure of FIG. 5, the porous member 13 is made into a deformed member having a stepped portion 13a on the outer circumference, and the porous member 13 is valved by using a bush 14 having a stepped hole to which the porous member 13 fits and fits. It is fixed to the body 4.

A female screw 11a is formed on the inner peripheral surface of the recess 11, and a male screw 14a is formed on the outer circumference of the bush 14. By screwing the bush 14 into which the porous member 13 is fitted into the recess 11, the porous member 13 is formed. It is fixed and held.

In the assembly structure of FIG. 6, the porous member 13 is formed of a hard body such as a sintered body or a hard resin, and a male screw 13b is processed on the outer circumference of the porous member 13, and the porous member 13 is formed on the inner circumference. It is fixed by directly screwing it into the recess 11 in which the female screw 11a is machined on the surface.

Further, in the assembling structure of FIG. 7, a presser plate 15 having a hole into which a part of the porous member 13 is fitted is fixed to the tip end side of the valve body 4 with a screw 16, and the porous member 13 is recessed by the presser plate 15. It is intended to be held by retaining it from 11.

In the assembly structure of FIG. 8, a boss portion 17 having a male screw 17a machined on the outer circumference is provided so as to project from the tip of the valve body 4, a recess 11 is machined in the boss portion 17, and a porous member 13 is formed in the recess 11. It is inserted, and a pressing member (it is a union nut in the figure) 18 is screwed into the boss portion 17, and the pressing member 18 holds the porous member 13 out of the recess 11.

In the assembly structure of FIG. 9, the valve rod 3 (valve body 4) is provided with a built-in hole 19 having a small diameter on the tip side reaching the inside of the valve body 4 inside the valve rod 3 and a recess 11 on the tip side of the built-in hole 19. ), Insert the porous member 13 having a small diameter at the tip into the recess 11 on the tip side of the built-in hole 19, and add the nipple 20 to be screwed into the rear part of the built-in hole 19 and the holding pipe 21 to be inserted into the built-in hole 19. The holding pipe 21 is pressed against the porous member 13 by the nipple 20 to fix the porous member 13 in the recess 11.

As described above, the porous member 13 can be incorporated into the recess 11 at the tip of the valve body by utilizing various structures. The various structures referred to here are structures that hold the porous member 13 so as not to come off. For example, a hole such as a bush 14 into which the porous member 13 is inserted is made into a tapered hole, and the outer periphery of the porous member 13 is formed. It also includes a shape in which the porous member 13 is tapered and fitted into the tapered hole to prevent it from coming off from the hole.

2 and 3 show a valve 1A with a gas purge function that employs a power-driven operating member 6. The exemplary operating member 6 is a combination of a fluid pressure driven cylinder (which in the figure is an air cylinder) 6e that pushes and pulls the valve stem 3 and a limit switch 6f that controls the movement of the cylinder 6e.

In the cylinder 6e, when the pressure in the upper chamber partitioned by the piston is released, the piston rod is pushed upward by the force of the spring incorporated in the lower chamber, and the valve closing force is transmitted to the valve rod 3. There is.

The limit switch 6f is fixed to the valve body 2, and when the piston rod of the cylinder 6e is pushed down by the supplied fluid, the indicator 6g attached to the stem lock 9a drops by a predetermined amount from the position shown in the figure, and the limit switch 6f is used. The 6f is activated and the supply of the working fluid to the cylinder 6e is stopped based on the signal from the operation.

Although the figure is omitted, the valve 1A with a gas purge function of FIG. 2 has a detent portion of the valve stem 3 like the valve of FIG.

Further, since the piston rod of the cylinder 6e and the valve stem 3 are connected via the stem lock 9a which is a component of the detent portion, the gas purge hole 10 provided in the valve rod 3 is a connecting portion of the gas supply pipe. The inlet provided with the 12 is opened to the outer periphery in the middle of the longitudinal direction of the valve rod 3 protruding to the outside of the valve body 2. Further, the stem guide 7 is integrally processed with the valve body 2.

Since the other configurations are almost the same as those of the valve of FIG. 1, the same elements are designated by the same reference numerals and re-explanation is omitted.

In each of the valves 1, 1A, and 1B with a gas purge function of FIGS. 1, 2, and 4, the outlet Op of the fluid passage 2a provided in the valve body 2 is on the side where the flange 2b for connection is provided ( It is located diagonally below the valve body 2. The operating direction of the valve stem 3 when the valve body 4 opens (or closes) the fluid passage 2a may be set in the opposite direction.

The valves of FIGS. 1 and 2 are closed by pushing up the valve rod 3, while the valve of FIG. 4 is opened by pushing up the valve rod 3.

The stem lock 9a of the detent portion 9 of the valve 1B with a gas purge function of FIG. 4 is fixed to the valve rod 3 by press-fitting a taper pin 9d between the valve rod 3 and the valve rod 3.

Further, in the valve 1B with a gas purge function of FIG. 4, the valve body 4 separates from the valve seat 5 and opens by pushing up the valve rod 3, so that the lower side of the valve rod 3 provided with the male screw 3a is the operation member 6. It is projected downward by a predetermined amount from the lower end of the sleeve 6a. Since the other configurations are almost the same as those of the valve of FIG. 1, the same elements are designated by the same reference numerals and re-explanation is omitted.

As described above, the valves of FIGS. 1 and 2 and the valve of FIG. 4 have the valve opening and closing directions of the valve body 4 opposite to each other, but both of them can introduce the purge gas through the valve itself. There is no particular difference in functionality.

As can be seen from FIGS. 1, 2 and 4, the shape of the valve body 4 is not particularly limited. In short, the valve rod 3 is provided with a gas purge hole 10, the inlet of the gas purge hole 10 is opened to the outside, and the outlet is opened to a recess 11 formed at the tip of the valve body 4, and the recess 11 is a hole through which only gas is passed. If the quality member 13 is attached, the effect of the present application can be obtained.

1, 1A, 1B Valve with gas purge function 2 Valve body 2a Fluid passage 2b Flange Ip Inlet Op Outlet 3 Valve rod 3a Male screw 4 Valve body 5 Valve seat 6 Operating member 6a Sleeve 6b Handle 6c Washer 6d Lock nut 6e Cylinder 6f Limit switch 6g Indicator 7 Stem guide 8 Gland seal 8a Gland packing 8b Gland follower 8c Gland plate 8d Stud bolt and nut 9 Anti-rotation part 9a Stem lock 9b Roller 9c Guide 9d Tapered pin 10 Gas purge hole 11 Recess 11a Female screw 12 Gas supply pipe connection 13 Porous member 13a Step portion 13b Male screw 14 Bush 14a Male screw 15 Pressing plate 16 Thread 17 Boss 17a Male thread 18 Pressing member 19 Built-in hole 20 Nipple 21 Pressing pipe

Claims (4)

At the valve body (2) having a fluid passage (2a) with an inlet / outlet, the valve rod (3) liquid-tightly and slidably inserted into the valve body (2), and the tip of the valve rod (3). An operating member (6) for advancing and retreating the valve body (4) provided, the valve seat (5) provided on the valve body (2) for bringing the valve body (4) into contact with each other, and the valve rod (3). ) And a valve
The valve stem (3) is provided with a gas purge hole (10) inside.
The gas purge hole (10) has an inlet provided at a recess (11) provided at the tip of the valve body (4) and an inlet provided with a connecting portion (12) of a gas supply pipe outside the valve body (2). Open to each
A valve with a gas purging function in which a porous member (13) that allows gas to pass through the recess (11) and blocks the passage of liquid is incorporated. The valve with a gas purge function according to claim 1, wherein the porous member (13) is made of a single material of resin, metal, ceramics, organic fiber, inorganic fiber, or a composite material obtained by combining these materials. The inlet of the gas purge hole (10) provided with the connecting portion (12) of the gas supply pipe is open to the end of the valve rod (3) on the side where the operating member (6) is installed. The valve with a gas purge function according to claim 1 or 2. The first or second aspect of the present invention, wherein the inlet of the gas purge hole (10) provided with the connecting portion (12) of the gas supply pipe is open to the outer periphery in the middle of the longitudinal direction of the valve rod (3). Valve with gas purge function.

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