JPH0740778Y2 - Emergency shutoff valve - Google Patents

Description

TECHNICAL FIELD The present invention relates to an emergency shutoff valve, and more particularly, to an emergency shutoff valve that shuts off a fluid passage in the event of a fire.

2. Description of the Related Art Conventionally, a sensor for temperature detection is provided separately from a fluid flow pipe including an electromagnetic valve, and when the sensor detects that the environmental temperature has risen to a predetermined temperature, the electromagnetic valve is activated by the temperature detection signal. It was activated and blocked the flow path.

Conventionally, there has been a problem that an electric control circuit for connecting the sensor and the solenoid valve is required in addition to the sensor, the structure is complicated and expensive, and a wiring space is required.

Object The present invention solves the above-mentioned problems of the prior art and aims to provide an emergency shutoff valve having a simple structure.

Structure The present invention has the above-mentioned object, when the latch device engages with the recess formed in the valve rod and the recess when the valve body is in the valve open position, and when the valve body is in the valve close position. A sleeve that is disengaged from the recess, a small diameter chamber that holds the ball when the recess is engaged, and a large chamber that holds the ball when the recess is engaged and disengaged, and is movable in the axial direction of the valve rod. When,
A latch spring that biases the sleeve in a direction in which the small diameter portion holds the ball, and a latch spring that is contracted at room temperature and expands due to a temperature rise to exert a pressing force on the sleeve in the opposite direction to the latch spring. And a latch release spring made of a biasing shape memory alloy.

The details of the structure and operation of the present invention will be described based on an embodiment shown in the drawings.

In FIG. 1, an emergency shutoff valve 1 includes a valve chamber 2 and a valve chamber 2
A valve box 6 having an inflow passage 3 and an outflow passage 4 which communicate with each other, and a valve seat 5 formed between the inflow passage and the valve chamber.

A valve body 7 is housed in the valve chamber 2 so as to move toward and away from the valve seat 5,
The valve body 7 is attached to the valve seat 6 by a spring 8 stretched between the valve body 7 and the valve box 6.
Is pressed by.

A valve rod 9 is fixed or integrally formed with the valve body 7, the valve rod penetrates the valve box 6, and a hole 11 into which a pulling rod 10 is inserted is formed in a portion protruding outward. The pull rod 10 can also be fixed to the valve rod 9.

A plurality of balls 13 that can be engaged with and disengaged from an annular groove 12 formed on the outer surface of the valve rod 9 in the valve box 6, and the balls 13.
A sleeve 14 for accommodating 13 is provided, and the sleeve 14 is movable in the axial direction of the valve rod 9.

A small-diameter inner chamber that accommodates the ball 13 engaged with the annular groove 12 of the valve rod 9 in the engaged state in the inner circumference of the sleeve 14.
15 and a large-diameter inner chamber 16 that holds the ball 13 in a state of coming out of the annular groove 12 and being in contact with the outer periphery of the valve rod 9, and the small-diameter inner chamber 15 and the large-diameter inner chamber 16 are formed by an inclined surface 17. Smoothly connected and balls
The movement of 13 is performed smoothly between the large diameter inner chamber 16 and the small diameter inner chamber 15. The large-diameter inner chamber 16 of the sleeve 14 is the valve body 7
It is arranged to be located on the side of.

A flange portion 18 is formed as a spring seat on the outer periphery of the sleeve 14, and a latch spring 19 is stretched between the flange portion 18 and the side wall portion of the valve stem 6 of the valve box 6 which extends toward the valve body 7. Apply pressing force to. A latch release spring 20 is mounted between the flange portion 18 and the valve box 6 so as to apply a pressing force in the opposite direction to the latch spring 19. The latch release spring 20 is formed of a shape memory alloy, is contracted at room temperature, expands when the environmental temperature rises, and at a predetermined temperature, for example, 50 ° C., the sleeve 14 which is a switching element resists the force of the latch spring 19.
Is formed so that it can be pushed into the operating position.
When the switching element moves to the operating position by the force of the latch release spring 20, the ball 13 moves to the large diameter chamber 16 and the ball 13 is disengaged from the annular groove 12. When the latch release spring 20 contracts at room temperature, the force acting on the sleeve 14 disappears, and the sleeve 14 is given the habit of moving to the non-actuated position by the force of the latch spring 19. Annular groove 12 of valve stem 9, ball 13 and sleeve
A latch device is formed by 14. Large diameter chamber of sleeve 14
16 is a stop wall for preventing the ball 13 from falling out.
21 can be provided.

A hole 22 is formed in the valve box 6 near the latch release spring 20 so that the ambient temperature is transmitted to the latch release spring 20.

When the pull-up rod 10 is inserted into the valve rod 9 or the fixed pull-up rod 10 is pulled up, the valve body 7 is separated from the valve seat 5 via the valve rod 9. When pulled up to a predetermined position, the ball 13 is inserted into the annular groove 12 of the valve rod 9 as shown in the right half of FIG.
Are engaged with each other, the sleeve 14 is moved downward to the inoperative position by the action of the latch spring 19, the ball 13 enters the small diameter chamber 15 of the sleeve 14, and the engaged state of the ball 13 and the annular groove 12 is maintained. It

Since the ball 13 hits against the end of the inner wall 23 of the valve box 6 and is prevented from moving toward the valve seat 5, if the position of the inner wall 23 hitting the ball 13 is properly set, the valve rod 9 will be in the latched state. Is integral with the ball 13 and can hold the valve element 7 in the valve opening position away from the valve seat 5.

The latch release spring 20 is extended against the force of the latch spring 19 by moving the sleeve 14 to the operating position in the upper part of the drawing, e.g.
When pushed and moved by the force of, the ball 13 opposes the large-diameter chamber 16 of the sleeve 14 as shown in the left half of FIG. 1, and is given the habit of moving in the direction of the valve chamber 5 by the force of the spring 8. The valve rod 9 moves by pushing the ball 13 out of the annular groove 12, and the valve body 7 is seated on the valve seat 5 and is in a valve closed state. Then the ball
13 is pushed into the large diameter chamber 16 of the sleeve 14.

In FIG. 2 showing a modified example, the valve portion including the valve element 7 and the valve seat 5 is the same as that in FIG. 1, but the latch device is modified. The same or corresponding portions as those in FIG. 1 are designated by the same reference numerals and the same description is omitted.

The valve rod 9 is slidably guided by the head portion 6a of the valve box 6, and a hole 31 through which the ball 13 can pass is formed in the head portion 6a.
Is set at a position facing the annular groove 12 of the valve rod 9 in the open / close position. A latch case 32 is fixed to the head portion 6a of the valve box 6, and a holding rod 33, which is a switching element, is provided in the latch case 32 in an operating position and a non-operating position in a direction orthogonal to the axis of the valve rod 9. It is movably supported between. A disk 34 acting as a spring seat is fixed to the presser bar 33. A latch spring 19 is stretched between the disc 34 and the end wall of the latch case 32, and the presser bar 33 is brought into the non-actuated position via the disc 34, that is, the ball 13 is engaged with the annular groove 12 of the valve rod 9. Apply a force to move to the pressing position.

A latch release spring 20 is mounted between the disk 34 and the end wall of the latch case 32 on the valve box side so as to apply a force in the opposite direction to the latch spring 19 to the disk 34. The latch release spring 20 is formed of a shape memory alloy, and is formed so as to shrink at room temperature as in the case of FIG. 1 and to expand to a predetermined length when heated and reaches a predetermined temperature.

Pull up the valve rod with a pull rod (not shown)
When the annular groove 12 comes to a position facing the ball 13, the holding bar 33, which is a switching element, presses the ball 13 into the annular groove 12 and holds it by the action of the latch spring 19 at room temperature. Therefore, the valve rod 9 is held in the open state. When the temperature rises, the latch release spring 20 expands, and when it becomes larger than the force of the latch spring 19, it moves the disk 34 against the latch spring 19 from the non-actuated position to the actuated position. Presser bar 33 due to movement of disk 34
Moves, and the pressing force on the ball 13 is released. At this time, since the valve body 7 is given the habit of moving to the closed position by the spring 8, the valve rod 9 pushes the ball 13 out of the annular groove 12 and moves to the state shown in the left half of FIG.

A hole 22 is formed in the latch case 32 so that the ambient temperature can be easily transmitted to the latch release spring 20.

Effect With the present invention, the latch release spring itself functions as a sensor, and the latch device can be activated by deformation depending on the ambient temperature, and the structure is simplified without the need for a temperature sensor, electric control device, solenoid, etc. It became possible to provide an inexpensive emergency shutoff valve. Compared to the example in the figure, if the inflow side and the outflow side are reversed and the inflow path in the figure is used as the outflow path and the outflow path is used as the inflow path, the high pressure fluid on the outflow path side presses the valve body against the valve seat. Therefore, even if you weaken the spring,
Or even if it breaks, the valve can be closed and shut off.

[Brief description of drawings]

FIG. 1 is a sectional view of an emergency shutoff valve according to the present invention, and FIG. 2 is a sectional view of a modified example. DESCRIPTION OF SYMBOLS 1 ... Emergency shutoff valve, 2 ... Valve chamber 3 ... Inflow passage, 4 ... Outflow passage 5 ... Valve seat, 6 ... Valve box 7 ... Valve body, 8 ... Spring 9 ... Valve rod, 12 ... Annular groove (latch device) 13 … Ball (latch device) 14… Sleeve (switching element) 19… Latch spring, 20… Latch release spring 33… Presser bar (switching element)

Claims (1)

[Scope of utility model registration request] 1. A valve chamber (2), an inflow channel (3) and an outflow channel (4) communicating with the valve chamber (2), the valve chamber (2) and an inflow channel (3) or an outflow channel (3). 4) A valve box (6) having a valve seat (5) formed between the valve seat (5) and one of the flow passages is provided, and the valve box (2) can be moved into and out of the valve seat (5). And a spring (8) for pressing the valve body (7) against the valve seat (5) and a valve body (7) attached to the valve body (7) and penetrating the valve box (6). A valve rod (9) that can be pulled up manually,
An emergency shutoff valve having a latch device for holding the valve body (7) in a valve opening position, wherein the latch device has a recess (12) formed in the valve rod (9) and the valve body (7). Is in the valve open position, the recess (1
A ball (13) that engages with the ball (2) and is disengaged from the recess (12) when the valve body (7) is in the valve closed position;
A small diameter chamber (15) which holds 3) when the recess (12) is engaged, and a large diameter chamber (16) which holds the ball (13) when engaging and disengaging the recess (12) are formed, and the valve rod (9) is formed. An axially movable sleeve (14), a latch spring (19) for biasing the sleeve (14) in a direction in which the small diameter part (15) holds the ball (13), and a room temperature. And has a latch release spring (20) made of a shape memory alloy for expanding the sleeve (14) in a direction opposite to the latch spring (19) by a temperature rise and urging a pressing force in the opposite direction. The latch release spring (20) surrounds a part of the valve rod (9) and is arranged close to the valve box (6), and the latch release spring (20) of the valve box (6) is close to the valve box (6). Emergency shutoff valve, characterized in that a hole (22) is formed in the area.