JP2004150510A - Cut-off valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve hermeticism and endurance reliability when a valve is closed. <P>SOLUTION: The cut-off valve is equipped with a slide drive mechanism 12, a sliding shaft 13 slidably mounted, a valve seat 8 disposed opposit to a valve element 11 provided to one end of the sliding shaft 13, and a spring 14 biasing in the direction of the valve seat 8. The valve element 11 has a fin type seal part 9a deforming when seating on the valve seat 8, and a positioning protection part 9b for preventing the fin type seal part 9a from being excessively deformed, wherein a valve rubber receiver 10 is provided to the back of the valve element 11 and loosely fitted to one end of the sliding shaft 13. By so doing, while a seal part of the valve rubber is closely fitted to the valve seat, the positioning part 9b prevents excessive deformation. Therefore, stable sealing performance is maintained. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a gas shut-off device for preventing a gas accident beforehand, and a shut-off valve used as another shut-off actuator.
[0002]
[Prior art]
As shown in FIG. 6, this type of conventional shut-off valve has a thickness gradually reduced toward the outer periphery from the outer periphery of the back surface of the valve rubber 1 facing the valve seat 2 to the inside of the diameter of the valve seat 2. A gradient 3 is provided. As a result, the gap 5 is formed between the valve rubber 1 and the valve rubber receiver 4 (see Patent Document 1).
[0003]
In this configuration, when the valve is in the open state, the valve element 6 having a slight inclination angle between the surfaces where the valve seat 2 and the valve rubber 1 come into contact with each other and closes performs a shutoff operation, and the valve seat 2 and the valve rubber 1 are closed. Is temporarily in partial contact and a gap is generated, the valve rubber 1 bends and deforms in the gap 5. The valve rubber 1 is in contact with the entire circumference of the valve seat 2 or the opening area of the gap is reduced, so that the pressure difference between the upstream and downstream of the valve rubber 1 increases, and the valve rubber 1 is sucked into the valve seat 2. Then, the gas was sufficiently shut off.
[0004]
[Patent Document 1]
JP-A-5-346184
[Problems to be solved by the invention]
However, the configuration of the above-mentioned conventional shut-off valve has a structure in which the valve rubber is interposed between the valve seat and the valve rubber receiver so that the valve rubber is in close contact with the valve. . As a result, the thickness of the valve rubber increases, and the rigidity of the valve rubber also increases. In this case, a high strength is required for the spring in order to deform the highly rigid valve rubber. As a result, the driving force of the slide driving mechanism must be increased, and there is a problem that power consumption increases.
[0006]
In addition, since the rigidity of the valve rubber is high, there has been a problem that even if a pressure from upstream is received, the entirety does not sufficiently conform to the valve seat and the sealing property is partially insufficient.
[0007]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention forms the seal portion of the valve body in a thin outward fin shape so that the valve body is brought into close contact with the valve seat with a light force, and the fin-like seal portion is formed by pressure from the upstream. The sealing property is improved by making full contact with the valve seat.
[0008]
Furthermore, according to the above invention, since the fin-shaped seal portion is prevented from being deformed more than necessary by providing the positioning contact portion with respect to the valve seat, the sealing property can be stably maintained.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
The invention according to claim 1 is provided with a slide drive mechanism, a slide shaft slidably mounted on the slide drive mechanism, and an end of the slide shaft protruding from the slide drive mechanism opposed to the valve seat. Valve body, and a spring for urging the valve body in the direction of the valve seat, wherein the valve body has a flexible valve rubber capable of abutting on the valve seat, A valve rubber receiver disposed on the back side of the surface facing the valve seat, wherein the valve rubber has an outward fin shape which is deformed by gas back pressure from the upstream side and is pressed against the valve seat. It has a sealing portion and a positioning contact portion for a valve seat for preventing the fin-shaped seal portion from being deformed more than necessary by the closing force of the spring. The seal portion of the valve rubber is formed in an outward fin shape, and has a high sealing property in which the valve rubber is completely adhered to the valve seat by pressure from the upstream. Furthermore, since the fin-shaped seal portion is prevented from being deformed more than necessary by providing the positioning contact portion with respect to the valve seat, the sealing property can be stably maintained.
[0010]
The invention according to claim 2 is characterized in that the shut-off valve uses a slide driving mechanism as a stepping motor. Since the valve can be opened and held by the holding torque of the stepping motor, a simple and highly stable shutoff valve can be provided.
[0011]
In the invention according to claim 3, the positioning contact portion provided on the valve body is surrounded by the fin-shaped seal portion and formed from a plurality of projections.
[0012]
When the valve is closed, the projection comes into contact with the valve seat as a positioning contact portion, so that it is possible to prevent the fin-shaped seal portion from being deformed more than necessary.
[0013]
According to a fourth aspect of the present invention, the positioning contact portion is formed by bending an outer peripheral end of the valve rubber receiver toward the valve seat side. As a result, it is possible to prevent the fin-shaped seal portion from being deformed more than necessary.
[0014]
According to a fifth aspect of the present invention, the positioning contact portion is formed in a flat plate and closely adhered so as to be included in the fin-shaped seal portion. Since the contact is made as a part, it is possible to prevent the fin-shaped seal part from being deformed more than necessary.
[0015]
The invention according to claim 6 is a form in which one or several positions of the positioning contact portion according to claim 4 or 5 are cut, whereby when the valve abuts on the valve seat at the time of closing the valve, the positioning contact portion is not provided. The space formed by the fin-shaped seal portion is not sealed, and the pressure from the upstream is transmitted to the fin-shaped seal portion of the valve rubber, so that the reliability of the valve closing is guaranteed.
[0016]
【Example】
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0017]
(Example 1)
FIG. 1 is a sectional view showing an open state of a shutoff valve according to a first embodiment of the present invention, and FIG. 2 is a sectional view showing a closed state of the shutoff valve. 1 and 2, reference numeral 7 denotes a gas flow passage through which gas flows from an inlet 7a to an outlet 7b. Reference numeral 8 denotes a valve seat provided in the gas flow passage 7, and reference numeral 9 denotes a valve body 9 provided upstream thereof. The valve body 9 includes an outward fin-shaped seal portion 9a and a positioning contact portion 9b for a valve seat. Reference numeral 10 denotes a valve rubber receiver for holding the valve rubber 9, and a valve element 11 is configured in combination with the valve rubber 9. Reference numeral 12 denotes a slide drive device which is configured to slide the slide shaft 13. A spring 14 biases the valve body 11 toward the valve seat 8.
[0018]
Next, the operation and operation will be described. FIG. 1 shows a normal valve-open state, in which the sliding shaft 13 and the valve element 11 are retracted, there is a gap between the valve seat 8 and the valve element 11, and gas can pass through the gas flow passage 7. When various sensors detect danger and an electric signal is sent from the control unit of the microcomputer meter, the slide drive device 12 operates, and the valve shaft 11 is pressed against the valve seat 8 by the slide shaft 13. At this time, the fin-shaped seal portion 9a first comes into contact with the valve seat 8, and the fin-shaped seal portion 9a deforms and press-fits to a position where the positioning contact portion 9b against the valve seat comes into contact with the valve seat 8. In this state, gas pressure is applied to the thin fin-shaped seal portion 9a, and the fin-shaped seal portion 9a having low rigidity surely adheres to the valve seat 8 to shut off gas. Further, the spring 13 keeps the valve closed even if there is no electric signal from the microcomputer meter control unit.
[0019]
(Example 2)
FIG. 3 is a sectional view showing an open state of a shutoff valve according to a second embodiment of the present invention. The second embodiment is different from the first embodiment in that the slide driving device 15 is a stepping motor. The components having the same reference numerals as those in the first embodiment have the same structure, and a description thereof will be omitted.
[0020]
Next, an operation and an operation will be described. As in the first embodiment, a stepping motor having a large torque at the time of stop is used for the slide drive mechanism, so that the valve closing state is reliably maintained with a simple structure without using a spring. Becomes possible.
[0021]
(Example 3)
FIG. 4 is a sectional view showing a valve body according to Embodiment 3 of the present invention. The third embodiment is different from the first embodiment (or 2) in that the valve rubber 9 is not provided with a positioning contact portion for the valve seat 8, and the valve rubber receiver 10 is provided with a positioning contact portion 10a for the valve seat. . The components having the same reference numerals as those in the first embodiment have the same structure, and a description thereof will be omitted.
[0022]
Next, the operation and action will be described. Unlike the valve rubber 9 made of a flexible material, the valve rubber receiver 10 is made of a material having high rigidity, so that the contact size between the valve rubber 9 and the valve seat is accurately maintained. It becomes possible.
[0023]
(Example 4)
FIG. 5 is a sectional view showing a valve body according to Embodiment 4 of the present invention. The fourth embodiment is different from the first embodiment (or 2 or 3) in that the valve rubber contact portion is an independent dedicated pad 16 which is neither the valve rubber 9 nor the valve rubber receiver 10.
[0024]
Next, the operation and action will be described. By using the pad 16 as a dedicated part, it is possible to set the most suitable material for the pad different from the valve rubber 9 made of a flexible material and the hard valve rubber receiver 10 and the valve. The rubber 9 and the valve rubber receiver 10 can each be formed into a simple shape with good moldability.
[0025]
【The invention's effect】
As is apparent from the above description, according to the shut-off valve of the present invention, the valve element has a fin-shaped seal portion deformed when seated on the valve seat and a positioning pad for preventing the fin-shaped seal portion from being deformed more than necessary. Because of this, there is an effect that a shut-off valve having excellent hermeticity can be obtained by utilizing the back pressure of gas.
[Brief description of the drawings]
1 is a cross-sectional view of a shut-off valve according to a first embodiment of the present invention in an open state. FIG. 2 is a cross-sectional view of the shut-off valve in a closed state. FIG. 3 is a cross-sectional view of a shut-off valve according to a second embodiment of the present invention. FIG. 4 is a cross-sectional view of a valve body of a shut-off valve according to a third embodiment of the present invention. FIG. 5 is a cross-sectional view of a valve body of a shut-off valve according to a fourth embodiment of the present invention. Cross-sectional view [Explanation of reference numerals]
Reference Signs List 8 valve seat 9 valve rubber 9a fin-shaped seal portion 9b positioning contact portion against valve seat 10 valve rubber receiver 11 valve body 12, 15 slide drive mechanism 13 sliding shaft 14 spring

Claims (6)

A slide drive mechanism, a slide shaft slidably mounted on the slide drive mechanism, a valve body provided at one end of the slide shaft, and a valve seat provided facing the valve body. A spring for urging the valve body in the direction of the valve seat, the valve body preventing a fin-shaped seal portion deforming when seated on the valve seat and an unnecessary deformation of the fin-shaped seal portion. A shut-off valve having a positioning abutting portion to be fitted, and a valve rubber receiver provided on the back of the valve body and loosely fitted to one end of the sliding shaft. 2. The shutoff valve according to claim 1, wherein a stepping motor is used for the slide drive mechanism. 2. The shut-off valve according to claim 1, wherein the positioning contact portion is surrounded by the fin-shaped seal portion and has a plurality of protrusions. 2. The shutoff valve according to claim 1, wherein the positioning contact portion is formed by bending an outer peripheral end of the valve rubber receiver toward a valve seat. 2. The shutoff valve according to claim 1, wherein the positioning contact portion is included in the fin-shaped seal portion and has a flat plate shape. 7. The shut-off valve according to claim 5, wherein a cut is made in at least one portion of a portion of the positioning contact portion that abuts on the valve seat.

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