JPH0875016A - Valve structure - Google Patents

Abstract

PURPOSE: To prevent leak of fluid to an outflow side valve when flow of the fluid is closed by providing a constitution in which the flow of the fluid from a first pipe to a second pipe is opened/closed by change of the direction of a through hole in a valve member disposed between the first and the second pipes by application of external force to the valve member. CONSTITUTION: In a valve structure in which fluid such as acid, alkali, or surface active agent flows in from a pipe 28 to flow out of a pipe 30, the pipes 28, 30 are connected to a case 10 by nuts 32, 34 respectively, and a valve member 12 is rotatably installed on the case 10. This valve member 12 has a through hole 20, so by turning a knob 22 provided at an end part of it by hand, the direction of the through hole 20 is changed for opening/closing flow of the fluid from the pipe 28 to the pipe 30. Seal members 42, 44 are disposed between the pipe 28 and the valve member 12, and between the valve member 12 and the pipe 30, thereby leak of the fluid is prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a valve structure for opening and closing a fluid flow without leaking the fluid.

[0002]

2. Description of the Related Art FIG. 5 is a sectional view showing a conventional valve structure. In this valve structure, a valve member 12 is rotatably mounted in a case 10, and an O-ring 14 is arranged between the case 10 and the valve member 12. The case 10 is formed with an inflow pipe 16 through which a fluid flows in and an outflow pipe 18 through which a fluid flows out. The valve member 12 has a cylindrical portion, and a through hole 20 is formed in this portion. In addition, a knob 2 is provided on one end of the valve member 12.
2 is formed, and by rotating the valve member 12 by applying an external force to the knob 22 to change the direction of the through hole 20, the flow of the fluid from the inflow pipe 16 to the outflow pipe 18 is opened and closed. That is, the valve member 12 is shown in FIG.
, The fluid in the inflow pipe 16 is stopped by the cylindrical surface of the valve member 12, and the outflow pipe 1
No going to 8, the fluid flow is closed. On the other hand, when an external force is applied to the knob 22 to rotate the valve member 12 by 90 degrees from the position of FIG. 5 so that the through hole 20 connects between the inflow pipe 16 and the outflow pipe 18, the fluid in the inflow pipe 16 is It goes through the through hole 20 towards the outflow pipe 18 and the fluid flow is opened.

[0003]

In such a conventional valve structure, the inflow pipe 16 passes through the gaps 24 and 26 between the case 10 and the valve member 12 by tightly fitting them to each other. It prevented the fluid therein from reaching the outflow pipe 18.

However, since there is a limit to improving the fitting accuracy, the inflow pipe 16 is passed through the gaps 24 and 26.
There is a problem that the fluid inside leaks to the outflow pipe 18 (see FIG. 5). In particular, when the fluid is a surfactant or the like, the fluid easily leaks into the gaps 24 and 26, so that the fluid leaks to the outflow pipe 18 more frequently.

Therefore, an object of the present invention is to provide a valve structure in which the fluid does not leak to the outflow side pipe when the fluid flow is closed.

[0006]

In order to achieve the above object, the invention according to claim 1 has a first pipe through which a fluid flows in and a second pipe through which a fluid flows out. It has a pipe, a case in which the first and second pipes are connected, and a through hole through which a fluid flowing from the first pipe to the second pipe passes, and the case and the first and second pipes receive an external force. A valve member that opens and closes the flow of fluid from the first pipe to the second pipe by changing the direction of the through hole by rotating with respect to the pipe, and is disposed between the first pipe and the valve member. A first seal member that allows the fluid that has passed through the first pipe to pass through the through hole without leaking, and a valve member and the second pipe that are disposed between the first seal member and the second pipe and that do not leak the fluid that has passed through the through hole. And a second seal member that passes through the second pipe.

A third seal member may be arranged between the valve member and the case.

At least one of the first seal member and the second seal member is preferably provided with a fitting portion that fits into the first or second pipe.

Further, the surface of at least one of the first seal member and the second seal member, which is in contact with the valve member, is a part of the first cylindrical surface, which is the surface of the valve member. The surface contacting at least one of the first seal member and the second seal member is a part of the second cylindrical surface, and the radius of the first cylindrical surface and the radius of the second cylindrical surface are It is preferable that they substantially match.

[0010]

In the present invention, an external force is applied to the valve member to change the direction of the through hole arranged between the first pipe and the second pipe, so that the first pipe changes to the second pipe. Open and close the fluid flow of. At this time, the fluid that has passed through the first pipe is passed through the through hole without leakage by the first seal member, and the fluid that has passed through the through hole is not leaked by the second seal member without leaking. Threaded through a pipe. Therefore, when the valve is closed, fluid will not leak to the second pipe.

[0011]

Embodiments of the present invention will be described below with reference to the accompanying drawings. Note that the same reference numerals are used for the same or corresponding parts in the drawings.

FIG. 1 is a perspective view showing a disassembled valve structure constructed according to the present invention, and FIG. 2 is a plan view and a side view showing a disassembled part of the valve structure. A fluid such as an acid, an alkali, or a surfactant flows in from the pipe 28 forming the first pipe and flows out from the pipe 30 forming the second pipe. Pipe 28,
30 is connected to the case 10 by nuts 32 and 34, respectively. A valve member 12 is rotatably attached to the case 10. A through hole 20 is formed in the valve member 12, and the fluid flowing up to the pipe 28 has a through hole 2 when the direction of the through hole 20 is the same as that of FIG.
Pass 0 to reach the pipe 30. In the valve member 12,
A knob 22 is provided for pinching with a hand to apply an external force and turning. When an external force is applied from the knob 22 to rotate the valve member 12 with respect to the case 10 and the pipes 28 and 30, the direction of the through hole 20 changes and the flow of fluid from the pipe 28 to the pipe 30 is opened and closed. That is, FIG.
The valve member 12 is attached to the case 1 at the angle shown in FIG.
When inserted at 0, the fluid flowing into the pipe 28 can reach the pipe 30 through the through hole 20. On the other hand, when a force is applied to the knob 22 to rotate the valve member 12 by 90 degrees, the fluid flowing into the pipe 28 will pass through the through hole 2
It cannot pass 0 and cannot reach the pipe 30.

A notch 36 is provided on the side of the valve member 12 opposite to the knob 22, and a protrusion 38 is formed inside the case. The portion of the valve member 12 that enters the case 10 has a substantially cylindrical shape and is hollow. The notch 36 is formed in the cylindrical portion 4
It is formed in a portion of about 90 degrees on the circumference of the end portion of 0. That is, the portion of about 90 degrees other than the shaded portion of FIG. 2B is the cutout portion 36. Therefore, the knob 22 is
The protrusion 38 can be rotated by an angle of entering the notch 36, that is, about 90 degrees. As described above, since the mechanism for limiting the rotation angle of the valve member 12 is provided inside the case 10, the valve structure becomes compact.

A seal member 42, which constitutes a first seal member, is arranged between the pipe 28 and the valve member 12 so that the fluid passing through the pipe 28 can pass through the through hole 20 without leaking. There is. Similarly, the valve member 12
A seal member 44, which constitutes a second seal member, is arranged between the pipe 30 and the pipe 30, and the fluid that has passed through the through hole 12 is passed through the pipe 30 without leaking.

3A and 3B are enlarged views showing the detailed construction of the seal members 42 and 44. FIG. 3A is a plan view and FIG. 3B is a side view. As shown in FIG. 3B, the seal member 42,
A contact surface 49 of the surface of 44 that contacts the cylindrical portion 40 of the valve member 12 is a part of the cylindrical surface. Then, the seal members 42, 4 on the surface of the valve member 12
The surface that abuts on the surface 4, that is, the cylindrical portion 40 is a part of the cylindrical surface as described above. The radius R of the contact surface 49 and the radius of the columnar portion 40 match. Therefore, when the valve member 12 is rotated, the contact between the seal members 42 and 44 and the valve member 12 can always be kept in close contact. Further, the seal members 42 and 44 are formed with openings 50 communicating with the through holes 20.

On the seal members 42 and 44, the projections 4 that fit into the recesses 46 (see FIG. 1) of the pipes 28 and 30, respectively.
8 is provided, and the recesses 46 and the protrusions 48 are fitted to each other, so that the seal members 42 and 44 are respectively connected to the pipe 2
It is fixed to 8 and 30. Therefore, when the valve member 12 rotates while the cylindrical portion 40 contacts the contact surface 49,
Due to the frictional force, the seal members 42 and 44 are moved to the pipes 28 and 3
There is no deviation from 0. The convex portion 4
Reference numeral 8 constitutes a fitting portion.

Further, as shown in FIGS. 1 and 2, if the O-ring 51 is arranged between the valve member 12 and the case 10, the fluid leaks from the gap between the valve member 12 and the seal members 42 and 44. Even in the case where the fluid leaks, it is possible to prevent the fluid from leaking from the gap between the valve member 12 and the case 10 toward the knob 22. O-ring 51
Is fixed in a groove 53 formed between the columnar portion 40 of the valve member 12 and the knob 22. The O-ring 51 constitutes a third seal member.

FIG. 4 shows an example of an apparatus in which this valve structure is used. This device is a device for developing and printing photographic film. Since such a process involves a chemical reaction, a processing solution containing vinegar, an alkali, a surfactant, etc. is used. It has a valve 52 for discharging. Since the valve 52 is housed in the door 54, FIG. 4 shows a state in which a part of the door 54 is removed. When the pipe 56 is connected with the valve 52 closed and the tank 58 is arranged at the tip of the pipe 56 and the valve 52 is opened, the waste liquid is stored in the tank 5
Can be placed in 8.

Of this valve structure, the case 1
0, valve member 12, pipes 28, 30 and nut 3
2, 34 are made of resin, and sealing members 42, 44 and O
If the ring 51 is made of rubber or the like, no metal is used, so that the ring 51 can have excellent corrosion resistance. Also, because it has a structure that can be assembled without using an adhesive,
Each part can be easily replaced. Further, since the pipes 28 and 30 can be replaced with ones having a different shape, for example, ones having a male thread cut, they can be used for many purposes.

[0020]

As described above, according to the present invention, an external force is applied to the valve member to change the direction of the through hole of the valve member arranged between the first pipe and the second pipe. , Opening and closing the flow of fluid from the first pipe to the second pipe. At this time, the fluid that has passed through the first pipe is passed through the through hole without leakage by the first seal member, and the fluid that has passed through the through hole is not leaked by the second seal member and is not leaked by the second seal member. Threaded through a pipe. Therefore, it is possible to obtain a valve structure in which the fluid does not leak to the second pipe on the outflow side when the valve is closed to close the fluid flow.

[Brief description of drawings]

FIG. 1 is a perspective view showing an exploded view of a valve structure constructed according to the present invention.

FIG. 2 is a plan view and a side view showing an exploded part of a valve structure constructed according to the present invention.

FIG. 3 is an enlarged view showing a detailed configuration of a seal member.

FIG. 4 is a diagram showing an example of an apparatus in which a valve structure constructed according to the present invention is used.

FIG. 5 is a cross-sectional view showing a conventional valve structure.

[Explanation of symbols]

10 ... Case, 12 ... Valve member, 20 ... Through hole, 28
... Pipe (first pipe), 30 ... Pipe (second pipe), 42 ... Seal member (first seal member), 44 ...
Sealing member (second sealing member), 48 ... Convex portion (fitting portion).

Claims (4)

[Claims] 1. A first pipe through which a fluid flows in, a second pipe through which a fluid flows out, a case in which the first and second pipes are connected, and It has a through hole through which the fluid flowing from the first pipe to the second pipe passes, and the direction of the through hole is changed by receiving an external force and rotating with respect to the case and the first and second pipes. A valve member that opens and closes the flow of fluid from the first pipe to the second pipe, and is disposed between the first pipe and the valve member,
A first seal member that allows the fluid that has passed through the first pipe to pass through the through hole without leaking, and is disposed between the valve member and the second pipe,
A second seal member that allows the fluid that has passed through the through hole to pass through the second pipe without leaking. 2. The valve structure according to claim 1, wherein a third seal member is arranged between the valve member and the case. 3. A fitting portion for fitting with the first or second pipe is provided on at least one of the first seal member and the second seal member. The valve structure according to 1 or 2. 4. A surface of at least one of the first seal member and the second seal member, which is in contact with the valve member, is a part of a first cylindrical surface,
The surface of the valve member, which is in contact with at least one of the first seal member and the second seal member, is a part of the second cylindrical surface, and the radius of the first cylindrical surface is The valve structure according to any one of claims 1 to 3, wherein and the radius of the second cylindrical surface are substantially the same.