JPH0590056U - Open / close valve - Google Patents

Abstract

(57) [Summary] [Purpose] To provide an on-off valve which has a simple structure and can prevent the sealing material from falling out of the storage chamber. [Structure] A circular rod-shaped valve rod having a fluid seal portion on a side surface and a fluid seal portion having a storage chamber for accommodating an annular seal material on a bottom surface, which is axially moved through a screw portion. A cylinder portion for accommodating the fluid seal portion formed therein, a fluid introduction hole opening inside the annular seal member, and a fluid outlet hole formed on the bottom surface of the cylinder portion. In an opening / closing valve including a valve body that is screwed with the threaded portion, an exhaust hole is provided that communicates with an outer side of the annular sealing material of the storage chamber and a bottom surface of the fluid sealing portion. To do.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an on-off valve used to open and close the flow of fluid.

[0002]

[Prior Art]

 The conventional on-off valve will be described below with reference to FIG. FIG. 3 is a vertical sectional view showing the structure of a conventional on-off valve. In FIG. 3, the on-off valve is constructed by combining the valve body 1 and the valve rod 14 with screws.

The valve body 1 is an opening 5 having a cylindrical opening at the center of the upper surface, and a screw 2 is provided on the side surface thereof. At the lower part of the opening 5, a cylindrical cylinder 6 having a larger bottom is formed. The bottom surface portion of the cylinder 6 serves as a valve seat 5 that seals fluid by contacting the bottom surface of the valve rod 14. A fluid introduction hole 3 is opened in the center of the valve seat 5, and a fluid outflow hole 4 is opened in the periphery thereof.

On the other hand, the valve rod 14 has a handle 7 in the upper part, and has a screw 2 ′ to be combined with the screw 2 provided in the valve body 1 in the central portion. The lower portion of the valve rod 14 serves as a cylindrical fluid seal portion 13 that fits in the cylinder 6. A groove 8 is provided in the center of the side surface of the fluid seal portion 13, and an O-ring 9 for sealing the fluid and the cylinder 6 is housed therein. The lower end of the fluid seal portion 13 is a seal portion end face 12 that is in contact with the valve seat 5, and has a chamber side face 11b and a chamber bottom face 11a at the center thereof, and a storage chamber 11 for storing the seal material 10 is provided. The sealing material 10 is housed in contact with the chamber side surface 11b and the chamber bottom surface 11a, and is prevented from falling off by the frictional force therebetween.

As a result, the fluid introduction hole 3 opens in the storage chamber 11, and the fluid outflow hole 4 faces the end face 12 of the seal portion.

The operation of the conventional on-off valve will be described below with reference to FIGS. 4 and 5. 4 and 5 are explanatory views of FIG. 3, in particular, FIG. 4 is an explanatory view of a valve closed state, and FIG. 5 is an explanatory view of a valve opened state. In the structure of the on-off valve described above, if the handle 7 is rotated and the fluid seal portion 13 is moved up and down in the cylinder 6 via the screw 2 and the screw 2 ', the storage chamber 11 and the seal member 10 will move to the valve seat. Since it comes into close contact with or separates from the fluid 5, the fluid introduction hole 3 and the fluid outflow hole 4 block or let out the fluid through the storage chamber 11.

[0007]

[Problems to be solved by the device]

In such a conventional on-off valve, when the frictional force of the seal material 10 on the chamber side surface 11b is smaller than the pressure P ₀ of the fluid introduction hole, the pressure P ₀ of the fluid introduction hole is discharged when the valve is opened. Since the pressure P _{1 in the} hole is larger than the pressure P ₁ , the sealing material 10 remains in close contact with the valve seat 5 and falls off from the storage chamber 11.

This problem will be described in detail with reference to FIGS. 6 and 7. 6 to 7 are explanatory views of problems of the conventional technique. In particular, FIG. 6 is an explanatory view of a force applied to the sealing material when the valve is in the closed state, and FIG. It is a figure.

As shown in FIG. 6, in the valve closed state, the sealing material 10 is constantly pressed against the chamber side surface 11b and the chamber bottom surface 11a by receiving the pressure P ₀ of the fluid introduction hole. From this state, when the valve rod 14 is lifted to open the on-off valve as shown in FIG. 7, a slight gap δ1 is generated between the end face 12 of the seal portion and the valve seat 5. Since the pressure P ₀ of the fluid inlet hole and the pressure P ₁ of the fluid outlet hole have a relationship of P ₀ > P ₁ , the seal material 10 protrudes into the gap δ ₁ due to this pressure difference, and as a result, the seal material 10 Remains in the valve seat 5, that is, falls out of the storage chamber 11.

The present invention has been made in view of the above problems of the related art, and an object of the present invention is to prevent a sealing material from falling out of a storage chamber with a simple structure. The purpose is to provide an on-off valve that can.

[0011]

[Means for solving problems]

 In order to achieve the above-mentioned object, the present invention has a fluid seal portion on a side surface and a fluid seal portion formed on a bottom surface for accommodating an annular seal material, respectively, and has a fluid seal portion in an axial direction through a screw portion. A circular rod-shaped valve rod to be moved, a cylinder portion accommodating the fluid seal portion formed inside, a fluid introduction hole opening inside the annular seal member, and a bottom surface of the cylinder portion. An opening / closing valve including a valve body having a fluid outflow hole formed therein and threadedly engaged with the screw portion, and It is characterized in that an exhaust hole communicating therewith is provided.

[0012]

[Action]

 According to the present invention, when the sealing material falls off and tends to separate from the bottom of the storage chamber in the initial state of valve opening, the fluid introduction hole is connected to the fluid introduction hole through the exhaust hole. By equalizing the pressures in the fluid outflow holes and the pressure on the sealing material, the force applied to the sealing material is mitigated, and as a result, the sealing material is prevented from falling off.

[0013]

【Example】

 Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a vertical sectional view showing the construction of an embodiment of the present invention. In the following FIGS. 1 and 2, the same parts as those in FIGS. 3 to 7 are designated by the same reference numerals, and the description thereof will be appropriately omitted.

In FIG. 1, 16 is an exhaust hole of this embodiment. The sealing material 10 is an O-ring. The exhaust hole 16 is provided so as to communicate between the inner side corner portion 15 formed by the chamber side surface 11b and the chamber bottom surface 11a of the storage chamber 11 which are in contact with the sealing material 10 and the seal portion end surface 12.

With such a configuration in which the exhaust holes are provided, in the initial state of valve opening, as shown in FIG. 7, when the sealing material 10 is slightly separated from the chamber bottom surface 11a, that is, the chamber bottom surface 11a. And a small gap is formed between the seal member 10 and a portion that was in contact with the seal member 10, and the gap portion communicates with the exhaust hole 16. Therefore, the fluid introduction hole 3 and the fluid outflow hole 4 are connected through the exhaust hole 16, and the pressure P ₀ of the fluid introduction hole is transmitted to the fluid outflow hole 4 through the exhaust hole 16. As a result, the pressure P ₁ of the fluid outflow hole is increased, and finally P ₀ = P ₁ . Therefore, the force applied to the sealing material 10 is alleviated and the sealing material 10 is prevented from falling off.

FIG. 2 is a sectional view showing the structure of another embodiment of the present invention. Instead of the O-ring shown in FIG. 1, a sheet packing 10 'as shown in FIG. 2 may be used.

[0017]

[Effect of the device]

 Since the present invention is configured as described above, it is possible to prevent the sealing material from falling out of the storage chamber with a simple structure.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing the configuration of an embodiment of the present invention.

FIG. 2 is a vertical sectional view showing the configuration of another embodiment of the present invention.

FIG. 3 is a vertical sectional view showing a configuration of a conventional on-off valve.

FIG. 4 is an explanatory diagram of a valve shutoff state of a conventional on-off valve.

FIG. 5 is an explanatory view of a valve opening state of a conventional on-off valve.

FIG. 6 is an explanatory view showing a force applied to a sealing material in a state where a conventional on-off valve is in a valve closed state.

FIG. 7 is an explanatory diagram showing the operation of dropping the seal material in the initial valve opening state of the conventional on-off valve.

[Explanation of symbols]

 1 Valve body 3 Fluid introduction hole 4 Fluid outflow hole 6 Cylinder 10 Seal material 11 Storage chamber 13 Fluid seal part 14 Valve rod 16 Exhaust hole

Claims (1)

[Scope of utility model registration request] 1. A circular injection valve having a fluid seal portion on a side surface and a fluid seal portion formed on a bottom surface for accommodating an annular seal material, respectively, and being axially moved through a screw portion. A rod, a cylinder portion accommodating the fluid seal portion formed therein, a fluid introduction hole opening inside the annular seal material, and a fluid outlet hole formed at the bottom surface of the cylinder portion. In the opening / closing valve having the valve body that is screwed with the threaded portion, an exhaust hole that communicates between the outer side of the annular sealing material of the storage chamber and the bottom surface of the fluid sealing portion is provided. Characteristic on-off valve.