JPH10213235A - Sluice valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To maintain the block of an opening part by a valve element and miniaturize a drive part by acting an attraction force by a magnetic force between a valve seat and a valve element, in a sluice valve for opening/closing the opening of an air tight tank. SOLUTION: A valve element 6 of an air tight low pressure side tank 1 having an opening 2 on its upperside is push-pressed to the valve seat 7 of the low pressure side tank 1 through a seal material 8 by the drive of an air cylinder 3. At the same time of the drive of the air cylinder 3, or at the required timing until the valve element 6 is stuck to the valve seat 7, an electromagnet 12 is electrified. Thereby, the valve element 6 is stuck to the valve seat 7 air- tightly by the push-press force of the air cylinder 3 as well as the magnetic attraction force of the electromagnet 12. Under this state, even if an outer force is exerted to the valve element 6 in a direction separating from the valve seat 7, the block state of the opening 2 can be maintained air-tightly by the attraction force of the electromagnet 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gate valve for opening and closing an opening of an airtight tank.

[0002]

2. Description of the Related Art A conventional gate valve will be described with reference to FIG.

[0003] In the figure, reference numeral 1 denotes an airtight low-pressure side tank having an opening 2 at an upper portion, and a lower surface of the opening 2 is a valve seat 7.
A case 4 is continuously provided on the lower surface of the low-pressure side tank 1, and an air cylinder 3 is provided inside the case 4. The rod 5 of the air cylinder 3 penetrates the bottom of the low-pressure side tank 1, the tip of the rod 5 projects into the low-pressure side tank 1, and the valve body 6 is fixed to the protruding end of the rod 5. The valve element 6 can be in close contact with the valve seat 7. A seal member 8 is provided on the valve seat 7 of the low-pressure side tank 1, and the seal member 8 hermetically seals between the valve seat 7 and the valve body 6. The rod 5
A bearing 9 serving also as a seal is hermetically fitted to the low-pressure side tank 1 penetrating portion. The valve 6 is pressed by the valve seat 7 of the low-pressure side tank 1 via the seal material 8 by the driving of the air cylinder 3, and the opening 2 is airtightly closed.

Next, referring to FIGS. 5 and 6, a description will be given of a case where a conventional gate valve is used to open and close between two tanks. FIG. 5 shows a state in which the valve element 6 has opened the opening 2, and FIG.
Indicates a state in which the valve element 6 has closed the opening 2.

[0005] An airtight high-pressure side tank 11 having an opening 10 in the lower part is airtightly connected to the upper surface of the low-pressure side low-pressure side tank 1 so that the opening 10 and the opening 2 are aligned.

The inside of the low-pressure tank 1 and the high-pressure tank 11
The valve body 6 is pressed by the valve seat 7 via the seal member 8 by driving the air cylinder 3 in a vacuum state. The air cylinder 3 holds the pressing force of the valve body 6, and the opening 2 is airtightly closed.

When the inside of the high pressure side tank 11 is returned to the atmospheric pressure and a pressure difference is generated between the two tanks, a force in the opening direction acts on the valve element 6, but the air cylinder 3 is connected to the rod 5.
, The valve body 6 is pressed with a force greater than the pressure difference, and the closed state of the opening 2 is kept airtight. After the inside of the high-pressure side tank 11 is evacuated and maintained in a vacuum, the valve body 6 moves in a direction away from the valve seat 7 by driving the air cylinder 3 and returns to the initial state.

[0008]

In the above-mentioned conventional gate valve, the force required to move the valve element 6 to the closed position of the opening 2 may be small, but the valve element 6 is pressed to the closed position. However, a large force is required to maintain a hermetically closed state against the pressure difference between the two tanks, and thus requires a large air cylinder and a high air supply pressure. Therefore, there has been a problem that the gate valve is enlarged and the air supply source is enlarged, and the production cost is increased.

The present invention has been made in view of the above circumstances, and aims to provide a small gate valve which can obtain sufficient airtightness and has a simple structure without using a driving unit such as a large air cylinder. It is.

[0010]

SUMMARY OF THE INVENTION The present invention relates to a gate valve configured to apply a magnetic attraction between a valve seat and a valve body, and to a gate valve provided with an electromagnet on the valve seat side. The invention relates to a gate valve provided with an electromagnetic force on the valve body side, and further relates to a gate valve provided with an electromagnet control device for controlling at least one of a power supply timing and a power supply amount to an electromagnet, which opens and closes an opening of an airtight tank. is there.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

First, a first embodiment of the present invention will be described with reference to FIG. In FIG. 1, the same components as those shown in FIG. 4 are denoted by the same reference numerals.

In FIG. 1, reference numeral 1 denotes an airtight low-pressure side tank 1 having an opening 2 formed in an upper portion thereof. A valve seat 7 is formed around the opening 2, and at least the valve seat 7 is made of a magnetic material. It has become. An electromagnet 12 is formed along the periphery of the opening 2 on the upper surface of the low-pressure side tank 1.
A case 4 for accommodating the air cylinder 3 is continuously provided on the lower surface of the low-pressure side tank 1. The air cylinder 3
The rod 5 penetrates the bottom of the low-pressure side tank 1, the tip of the rod 5 projects into the low-pressure side tank 1, and the valve body 6, which is a magnetic material, is fixed to the protruding end of the rod 5. And
The valve element 6 can close the opening 2 in an airtight manner. A seal material 8 is provided on the valve seat 7 of the low-pressure side tank 1, and a bearing 9 also serving as a seal is hermetically fitted to a portion of the rod 5 penetrating the low-pressure side tank 1.

The operation will be described below.

The valve body 6 is pressed by the air cylinder 3 against the valve seat 7 of the low-pressure side tank 1 via the seal material 8. The electromagnet 12 is energized at the same time as the driving of the air cylinder 3 or at a required time until the valve body 6 comes into close contact with the valve seat 7. The valve body 6 is airtightly adhered to the valve seat 7 by the electromagnet 12 together with the pressing force of the air cylinder 3. Even if an external force acts on the valve body 6 in a direction away from the valve seat 7, the closed state of the opening 2 is kept airtight by the attraction force of the electromagnet 12.

Referring to FIGS. 2 and 3, a description will be given of a case in which the gate valve according to the above-described embodiment is used to open and close two tanks having different pressures.

FIG. 2 shows a state in which the valve 6 opens the opening 2, and FIG. 3 shows a state in which the valve 6 closes the opening 2. 2 and 3, FIGS. 5 and 6
The same components as those shown in FIG.

An airtight high-pressure tank 11 having an opening 10 in the lower part is connected to the upper surface of the low-pressure tank 1 in an airtight manner, and the opening 10 and the opening 2 are aligned.

The operation will be described below.

The inside of the low-pressure tank 1 and the high-pressure tank 11
When high pressure air is supplied to the air cylinder 3 by an air supply device (not shown) in a state in which both are in a vacuum state, an electromagnet control device (not shown) receives a signal from the air supply device, and the electromagnet control device (not shown) A signal to a power supply that does not
Generates magnetic force.

It should be noted that the electromagnet control device includes the electromagnet 12
The amount of power supplied to the tank can be controlled, and the amount of power supplied is adjusted to increase or decrease the attraction force according to the pressure difference between the two tanks or the required airtightness.

The valve body 6 is pressed by the valve seat 7 of the low-pressure side tank 1 via the seal material 8 by the driving of the air cylinder 3, and when the inside of the high-pressure side tank 11 returns to the atmospheric pressure. Since the low-pressure side tank 1 is maintained at a low pressure, a pressure difference occurs between the low-pressure side tank 1 and the high-pressure side tank 11, and an external force acts on the valve body 6 in the opening direction. The valve body 6 is attracted to the valve seat 7 by the electromagnet 12, and the attraction force of the electromagnet 12 overcomes the external force in the opening direction to keep the closed state of the opening 2 airtight.

When the high-pressure side tank 11 and the low-pressure side tank 1 are communicated with each other, the electromagnet controller stops power supply to the electromagnet 12 and drives the air cylinder 3. The electromagnet 12 no longer generates a magnetic force, and the valve body 6 separates from the valve seat 7 to open the opening 2.

In the above-described embodiment, the electromagnet 12 is provided on the upper surface of the low-pressure side tank 1, but the electromagnet 12 may be provided on the valve 6 side. or,
Although the air cylinder 3 is used as a drive unit, a hydraulic cylinder or the like may be used instead of a hydraulic cylinder, and an electromagnetic cylinder may be used instead of the hydraulic cylinder. Furthermore, in the above description, the case where the inside of the low-pressure side tank 1 is set to a vacuum state and the inside of the high-pressure side tank 11 is set to a negative pressure such as a vacuum or the atmospheric pressure is described. Equal positive pressure,
The inside of the high-pressure tank 11 may be the same pressure or the high pressure as the inside of the low-pressure tank 1. Further, the force for bringing the valve body 6 into close contact with the valve seat 7 may be a magnetic force alone, or may be a combined force of the magnetic force and the pressing force of the cylinder.

[0025]

As described above, according to the present invention, the closing of the opening by the valve body is maintained by utilizing the magnetic attraction force.
The force required to oppose the pressure difference between the tanks is not required, and a small-capacity drive unit can be used, the manufacturing cost can be kept low, the drive unit can be downsized, and the drive unit can be downsized. Thus, the operation speed of the gate valve is increased, and the gate valve itself exhibits various excellent effects such as downsizing.

[Brief description of the drawings]

FIG. 1 is a front sectional view showing a first embodiment of the present invention.

FIG. 2 is a front sectional view showing an application example of the first embodiment.

FIG. 3 is a front sectional view showing another operation state of the application example of the first embodiment.

FIG. 4 is a front sectional view showing a conventional gate valve.

FIG. 5 is a front sectional view showing the use of the conventional gate valve.

FIG. 6 is a front sectional view showing the use of the conventional gate valve.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Low pressure side tank 3 Air cylinder 5 Rod 6 Valve body 7 Valve seat 11 High pressure side tank 12 Electromagnet

Claims (4)

[Claims] 1. A gate valve, wherein a magnetic attraction force acts between a valve seat and a valve body. 2. The gate valve according to claim 1, wherein an electromagnet is provided on a valve seat side. 3. The gate valve according to claim 1, wherein an electromagnetic force is provided on the valve body side. 4. The gate valve according to claim 2, further comprising an electromagnet control device for controlling at least one of a power supply timing and a power supply amount to the electromagnet.