JPH0735249A - Fluid passage switching valve - Google Patents

Abstract

PURPOSE:To smooth switching of fluid passages even for fluid having adhesive property by engaging a valve body having ports to communicate an entrance passage with an exit passage selectively inside a case body having the entrance passage and the exit passage. CONSTITUTION:In the case of transporting powder from an upstream hopper to a downstream hopper, a valve body 21 is moved left by a cylinder 27 to let a first port 22 of the valve body 21 coincide with an entrance passage 12 of a case body 11 and a first exit passage 13. Next, nitrogen gas or the like is supplied to a cylinder 32 for a clamp to move a piston 33 up to press the valve body 21 onto an upper wall of the case body 11, and joint parts of the port 22 with the entrance and exit passages 12, 13 are sealed by an upper and a lower seal members 31, 34. In the case of cleaning an upstream hopper, the valve body 21 is moved right, solvent is jetted from a solvent shower 35 to clean waste slurry or the like attached to an inclined plate 24, and the waste slurry is discharged through a transport tube 40, the entrance passage 12, a second port 23, a second exit passage 14, and a discharge tube 41.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flow path switching valve,
In particular, the present invention relates to a large-scale flow path switching valve used by being incorporated in a pipe for transferring a large amount of fluid in a chemical plant or the like.

[0002]

2. Description of the Related Art Conventionally, as a typical one which is incorporated in a pipe and which switches a pipe flow path,
There are a damper valve that switches a flow path by swinging a butterfly, and a ball valve that switches a flow path by rotating a ball having a plurality of ports. Of these, the damper valve is
Although it can be used by incorporating it into a pipe having a relatively large diameter, there is a problem that it is not possible to sufficiently secure the sealing property between the switching flow paths because of poor sealing performance. Also, the ball valve has a relatively good sealing property and can secure the sealing property between the switching passages, but since the ball diameter must be increased in order to have a large diameter, the switching valve is large, heavy and expensive. There was a problem of becoming. Further, in both the damper valve and the ball valve, the butterfly and the ball are operated to switch the flow paths in a state in which the clearance between the damper body and the ball body is small, so that the fluid is adhesive. However, there is a problem that they adhere to the sliding surface of the butterfly and the ball and the operation is not performed smoothly, and that the sliding surface wears and the sealing performance deteriorates after long-term use. was there.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of these problems, and can be used by incorporating it in a pipe having a large diameter and ensure a sufficient sealing property between a port and a flow path. It is an object of the present invention to provide a flow path switching valve that is capable of achieving the above, and that does not impair operability even if the fluid has adhesiveness.

[0004]

In order to achieve the above object, a flow path switching valve of the present invention is a case body having an inlet passage and an outlet passage, and the inside of the case body is moved to the inlet passage and the outlet. A valve body having a port for selectively connecting any inlet passage and an outlet passage of the passage, and a port opening peripheral edge of the valve body and an opening peripheral edge of the inlet passage and the outlet passage of the valve body. An interposing seal member is provided, and preferably when the port of the valve body connects an arbitrary inlet passage and outlet passage, the valve body is provided from the side opposite to the side on which the seal member is attached. A clamp cylinder to be pressed against the case body, a seal member attached to the tip of the clamp cylinder and located at the periphery of the other side opening of the port, and a seal attached to the periphery of the one side opening of the valve body port. Consists of There, if necessary, provided with the port two or more, thereby forming at least one port of which the inclined plate and the side plate, it is constituted in which a solvent shower towards the inclined plate.

[0005]

According to the flow path switching valve of the present invention having such a structure, the valve body moves inside the case body when the clamping cylinder is in the unclamped state. And
When the port of the valve body connects the inlet passage and the outlet passage formed in the case body, the clamp cylinder is clamped to fix the valve body and seal the port and the inlet passage and the port and the outlet passage.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the flow path switching valve of the present invention will be described in detail below. First, a piping system using the flow path switching valve of this embodiment will be described with reference to FIG. In a chemical plant or the like, there is a system that transfers powder having adhesive properties from an upstream hopper 42 to a downstream hopper 43 via a transfer pipe 40. In such a system,
In order to remove the powder adhering to the inside of the upstream hopper 42,
It is necessary to regularly clean the upstream hopper 42. In this case, since the drainage such as water that has cleaned the upstream hopper 42 cannot flow to the downstream hopper 43, the flow passage switching valve 10 switches the flow passage to the discharge pipe 41 in the middle of the transfer pipe 40 to the drain tank 44. Pour.

Next, the flow path switching valve 10 will be described with reference to FIGS. The flow path switching valve 10 is connected between the transfer pipes 40 and between the transfer pipe 40 and the discharge pipe 41,
The case body 11 is arranged so as to be orthogonal to the transfer tube 40. The case body 11 has a tubular shape with a quadrangular cross section, an inlet passage 12 connected to the transfer pipe 40 is formed substantially in the center of the upper part, and the transfer pipe 40 is connected to the center of the lower part. And a second outlet passage 14 connected to the discharge pipe 41 is formed next to the first outlet passage 13. That is, the first outlet passage 13 is located on the same axis as the inlet passage 12, and the second outlet passage 14 is formed at a position displaced from the inlet passage 12.

Inside the case body 11, there is provided a valve body 21 which is movable in the central axis direction. The valve body 21 has a first port 22 connecting the inlet passage 12 and the first outlet passage 13 to each other.
And a second port 23 connecting the inlet passage 12 and the second outlet passage 13 is formed. Here, the first port 22 is formed in a tubular shape having the same diameter as the inlet passage 12 and the first outlet passage 13, and the second port 23 is formed by the inclined plate 24 facing from the inlet passage 12 to the second outlet passage 14. And side plates 25 that cover both sides of the inclined plate 24. Although the second port 23 is not entirely covered, the side plate 25 prevents the fluid from leaking to the side.

The valve body 21 is connected to a slide cylinder 27 via a rod 26, and the operation of the cylinder 27 causes the valve body 21 to move in the longitudinal direction of the case body 11, that is, the transfer pipe 4.
Move in a direction orthogonal to 0. Further, a case 28 made of a transparent plastic material or the like is provided on a side portion of the case body 11, and a rod 26 located inside the case 27 is provided.
An indicating member 29a is attached to an intermediate portion of the. Further, a scale plate 29b is provided inside the housing 28,
The position of the valve body 21 is indicated by forming a pair with the indicating member 29a. The valve body 21 can be moved by driving means other than the cylinder, for example, a motor.

An upper seal member 31 is attached to the periphery of the opening on the upper side of the first port 22 and the second port 23, that is, at a position facing the root of the inlet passage 12. Further, a clamping cylinder 32 is formed on the outer circumference of the base of the first outlet passage 13, and the lower seal member 3 is provided at the tip.
The piston 33 to which 4 is attached is moved up and down. Here, the upper and lower sealing members 31, 34
It is preferable to use Teflon packing or the like. When nitrogen gas or the like is supplied into the clamping cylinder 32 to move the piston 33 upward, the piston 33 presses the valve body 21 against the upper wall of the case body 11 via the lower seal member 34 at the tip, and the valve body 21 Fix and seal. In addition, the nitrogen gas or the like is supplied to the piston 33 by the rod 26
It is also possible to detect the movement of the switch with a micro switch or the like to confirm the switching of the switching valve, and based on this confirmation signal, automatically operate the operating valve or the like provided in the supply pipe of nitrogen gas or the like. .

A solvent shower 35 is provided on the side of the case body facing the inclined plate 24 of the second port 23 so that the waste slurry adhering to the inclined plate 24 can be washed. .

The operation of the flow path switching valve 10 of this embodiment having the above structure will be described with reference to FIGS. 1 and 3A and 3B. When the powder is transferred from the upstream hopper 42 shown in FIG. 4 to the downstream hopper 43, the clamping cylinder 3 is used.
Nitrogen gas or the like is depressurized from 2 to lower the piston 33 to an unclamped state, and a gap is formed between the case body 11 and the valve body 21 so that the valve body 21 can be smoothly moved. Next, the slide cylinder 27 is operated to move the valve body 21 to the left, and the positions of the first port 22 of the valve body 21 and the inlet passage 12 and the first outlet passage 13 of the case body 11 are aligned. To confirm whether the positions of the first port 22, the inlet passage 12 and the first outlet passage 13 are the same, check the rod 2
The confirmation is made by the indicator member 29a attached to the No. 6 and the scale plate 29b attached to the housing 28.

When it is confirmed that the positions of the first port 22, the inlet passage 12 and the first outlet passage 13 coincide with each other, nitrogen gas or the like is supplied to the clamping cylinder 32 to supply the piston 33.
To raise the clamp. As a result, the valve body 21
Is pressed against the upper wall of the case body 11 and fixed, and the upper seal member 31 and the lower seal member 34 seal the joint between the first port 22, the inlet passage 12 and the first outlet passage 13 (see FIG. 3 (a)). When the powder is flown from the upstream hopper 42 in this state, the powder is transferred to the transfer pipe 40,
It is transferred to the downstream hopper 43 through the inlet path 12, the first port 22, the first outlet path 13 and the transfer pipe 40.

Next, when cleaning the upstream hopper 42,
Nitrogen gas or the like is depressurized from the clamp cylinder 32 to make the valve body 21 movable, and the slide cylinder 27 moves the valve body 21 to the right. And
The positions of the second port 23 of the valve body 21 and the positions of the inlet passage 12 and the second outlet passage 14 are made to coincide with each other, and after confirming the coincidence, nitrogen gas or the like is supplied to the cylinder 32. As a result, the valve body 2
1 is pressed and fixed to the upper wall of the case body 11, and the upper port sealing member 31 and the lower sealing member 34 allow the second port 23, the inlet passage 12, and the second outlet passage 14 to be fixed.
The joint is sealed (see FIG. 3B). When the upstream hopper 42 is washed in this state, the waste slurry flows into the drain tank 44 through the transfer pipe 40, the inlet passage 12, the second port 23, the second outlet passage 14 and the discharge pipe 41. In this case, the second port 23 is the side plate 2 provided on both sides of the inclined plate 24.
5, the waste slurry is prevented from flowing out from the second port 23 to the first outlet passage 13.

When the discharge of the waste slurry is completed, the clamp is released to move the valve body 21 to the right again (FIG. 3 (a)).
), The solvent is ejected from the solvent shower 35 to wash the waste slurry adhering to the inclined plate 24 of the second port 23. The waste slurry in this case flows into the drain tank 44 through the second outlet passage 14 and the discharge pipe 41.

The present invention is not limited to the above-described embodiments, but can be variously modified within the scope of the invention. For example, the following modifications can be made according to the purpose of use of the flow path switching valve. Also includes. Clamp cylinder is omitted. In this case, the seal member can be attached to either the periphery of the opening of the port of the valve body or the periphery of the opening of the inlet passage and the outlet passage of the case body. The case body has two or more inlet passages and one or three or more outlet passages. A valve provided with three or more ports. A clamp cylinder is provided on the inlet side. Clamping cylinders are provided on the exit road side and the entrance road side. In this case, it is not necessary to attach the seal member to the periphery of the port opening portion of the valve body. The second port 23 is formed in a tubular shape. In this case, the solvent shower is provided on the upper wall of the case body so as not to interfere with the valve body 21.

[0017]

As described above, the flow path switching valve 1 of the present invention is as described above.
According to 0, since the valve body is moved inside the case body to switch the flow path and the valve body is clamped in the case body after the switching, the valve body can be used by being incorporated in a pipe having a large diameter. Further, there is an effect that a sufficient sealing property between the port and the flow path can be ensured and good operability can be maintained.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of a flow path switching valve according to the present invention.

FIG. 2 is a partially cutaway perspective view of a valve body of the flow path switching valve of the present invention.

FIG. 3 (a) and FIG. 3 (b) are views for explaining an operating state of the flow path switching valve of the present invention.

FIG. 4 shows a schematic diagram of a system using the flow path switching valve of the present invention.

[Explanation of symbols]

 10 flow path switching valve 11 case body 12 inlet passage 13 first outlet passage 14 second outlet passage 21 valve body 22 first port 23 second port 24 inclined plate 25 side plate 26 rod 27 sliding cylinder 28 housing 29a indicator member 29b Scale plate 31 Upper sealing member 32 Cylinder for clamping 33 Piston 34 Lower sealing member 35 Solvent shower

Claims (4)

[Claims] 1. A case body having an inlet passage and an outlet passage, and a port which moves inside the case body to selectively connect an arbitrary inlet passage and outlet passage among the inlet passage and the outlet passage. A flow path switching valve comprising: a valve body; a peripheral edge of an opening of a port of the valve body; and a seal member interposed between peripheral edges of an opening of an inlet passage and an outlet passage of the valve body. 2. A case body having an inlet passage and an outlet passage, and a port which moves inside the case body to selectively connect an arbitrary inlet passage and outlet passage among the inlet passage and the outlet passage. A valve member, a seal member attached to the periphery of one side opening of a port of the valve member, and the valve member when the port of the valve member connects an arbitrary inlet passage and outlet passage. A clamp cylinder that is pressed against the case body from the side opposite to the side on which is attached, and a seal member that is attached to the tip of the clamp cylinder and that is located at the peripheral edge of the opening on the other side of the port. Road switching valve. 3. The flow path switching valve according to claim 1, wherein two or more ports are provided, and at least one of the ports is formed by an inclined plate and a side plate. 4. The flow path switching valve according to claim 3, wherein a solvent shower is provided toward the inclined plate.