JPH0532879U - Seal-off valve - Google Patents

Abstract

(57) [Summary] [Purpose] To improve the sealing performance by making it possible to properly select the sealing surface pressure of the vacuum shutoff valve of the vacuum container. A container having a valve body attached to a wall of a vacuum container and having a hole communicating with the vacuum container, and a valve body joined to the valve body via a packing on a sealing surface of the valve body, In the valve for holding the vacuum inside, the sealing surface was conical. [Effect] In the conventional structure, the sealing surface pressure was constant, but by making the sealing surface a conical surface with an arbitrary angle,
Appropriate sealing surface pressure is obtained and the sealing performance is improved.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a seal-off valve used for a vacuum container.

[0002]

[Prior Art]

 FIG. 3 is a cross-sectional view showing a conventional seal-off valve. In the figure, 3 is a wall of a vacuum container, 4 is a valve body mounted on a wall 3 of this vacuum container, 5 is a wall 3 of the vacuum container and a valve. Weld meat for mounting the main body 4, 6 is a valve body fitted to the valve main body 4, 7 is a screw hole provided in the valve body 6, and 8 is an O-ring type, for example, mounted in a groove 9 of the valve body 6. Packing 10 is a sealing surface of packing 8. Reference numeral 11 is a valve operator, 12 is an exhaust port provided in the valve operator 11, and 13 is a screw rod which is attached to the valve operator 11 and screwed into the screw hole 7. Reference numeral 14 is an arrow indicating the direction of negative pressure during vacuum.

Next, the operation will be described. In order to evacuate the inside of the wall 3 of the vacuum container, the valve operator 11 is fitted into the outer diameter of the valve body 4, and the screw rod 13 of the valve operator 11 is screwed into the screw hole 7 of the valve body 6. Then, the screw rod 13 of the valve operator 11 is pulled up to open the valve body 6. After that, the inside of the wall 3 of the vacuum container is evacuated by a vacuum pump (not shown) from the exhaust port 12 provided in the valve operator 11. When the vacuum is reached, the screw rod 13 of the valve operator 11 is pulled down, and the valve body 6 is inserted into the valve body 4 again. Since the vacuum container has a negative pressure, the valve body 6 is sucked and the sealing surface 10 It is sealed with the packing 8 of. Further, by removing the valve operator 11, the vacuum container is vacuum-sealed.

[0004]

[Problems to be solved by the device]

The conventional seal-off valve is configured as described above, and the force applied to the packing is π / 4 · d ₂ × 1 atmospheric pressure in FIG. 3 because the sealing surface is perpendicular to the direction of negative pressure. It will be constant. Therefore, it is difficult to obtain an appropriate sealing surface pressure depending on the surface accuracy of the sealing surface and the material of the packing, and there are problems such as vacuum leakage.

The present invention has been made to solve the above problems, and an object thereof is to obtain a seal-off valve capable of arbitrarily changing the seal surface pressure.

[0006]

[Means for Solving the Problems]

 The seal-off valve according to the present invention has an appropriate conical surface on the sealing surface to optimize the sealing surface pressure and improve the sealing performance.

[0007]

[Action]

Since the force applied to the seal in this invention has a cone angle of θ with respect to the direction of negative pressure, it becomes 1 / sin θ × π / 4 · d ₂ × 1 atmospheric pressure in FIG. 2, and the cone angle θ is properly set. As a result, an appropriate sealing pressure can be obtained.

[0008]

【Example】

 Example 1. An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, 1 is a vacuum container, and 2 is a seal-off valve attached to this vacuum container. FIG. 2 is a detailed sectional view of this seal-off valve. In the figure, 3 is a wall of the vacuum container 1 of FIG. 1, 4 is a valve body attached to the wall 3 of the vacuum container, 5 is welded meat for attaching the wall 3 and the valve body 4 of the vacuum container, and 6 is a valve body 4. A valve element to be fitted, 7 is a screw hole provided in the valve element 6, 8 is an O-ring type packing attached to the valve element 6, and 14 is a cone having a direction of negative pressure 15 and a cone angle of θ. It is a shaped sealing surface. Others 11 to 13 are the same as in the conventional example, and the description thereof will be omitted.

Next, the operation will be described. In order to make the inside of the vacuum container 1 a vacuum, the valve operator 11 is fitted into the outer diameter of the valve body 4, and the screw rod 13 of the valve operator 11 is screwed into the screw hole 7 of the valve body 6. Next, the threaded rod 13 of the valve operator 11 is pulled up to open the valve body 6. After that, the inside of the vacuum container 1 is evacuated by a vacuum pump (not shown) from the drainage port 12 provided in the valve operator 11. When the vacuum is reached, the screw rod 13 of the valve operator 11 is pulled down, and the valve body 6 is inserted into the valve body 4 again, so that the inside of the vacuum container has a negative pressure. Seal with. After that, by removing the valve operator, the vacuum container is vacuum sealed. At this time, since the sealing surface 14 has a conical shape, the force applied to the seal 8 is 1 / sin θ × π / 4 · d ₂ × 1 atmospheric pressure, and by setting the conical angle θ appropriately, an appropriate sealing pressure can be obtained. Is obtained.

[0010]

[Effect of the device]

 As described above, according to the present invention, since the sealing surface is the conical surface, there is an effect that an appropriate sealing surface pressure can be obtained if the conical angle is properly selected.

[Brief description of drawings]

FIG. 1 is a cross-sectional side view showing a vacuum container according to an embodiment of the present invention.

FIG. 2 is a sectional view showing a seal-off valve of an embodiment of the present invention.

FIG. 3 is a sectional view showing a conventional seal-off valve.

[Explanation of symbols]

 1 Vacuum container 3 Wall 4 Valve body 6 Valve body 8 Packing 14 Sealing surface

Claims (1)

[Scope of utility model registration request] 1. A valve body mounted on a wall of a vacuum container, the valve body having a hole communicating with the vacuum container; and a valve body joined to the valve body via a packing on a sealing surface of the valve body. A seal-off valve, characterized in that the sealing surface has a conical shape in a valve for maintaining a vacuum in a container.