JPH1089510A - Gas cutoff valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make gas flow speed have little effect when a valve is closed by forming a needle chamber whose bottom surface is inclined at a down slope toward a center on an upper part of a main body of a gas cutoff valve interposed in a gas feed passage for supplying gas to a burner, and push-downed a valve element by a needle through a rod projection formed on the valve element. SOLUTION: It is set that the sum of force for pushing down a valve element 31 by a self-weight of a needle 37 and a self-weight of a valve element 31 is increased comparing with mixed force of force of gas pressure for pushing down the valve element 31 to a valve seat 35 and energizing force upward by a spring 34a. In a condition in which the needle 37 is entered into a recessed part 36b of the needle chamber 36, the top end of a projection 31c is pushed down by the needle 37 for a prescribed distance, the valve element 31 is opened separate from the valve seat 35, and gas is ventilated. However, when the needle 37 is out from the recessed part 36b by the earthquake and the like and is moved on a slant surface 36c, the top end of the projection 31c is opened, and thereby, the valve element 31 is raised by the spring 34a, is seated on the valve seat 35 so as to shut out flow of gas.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas shut-off valve which is provided in the middle of a gas supply path and closes the gas supply path when vibration is applied or when the gas supply path is inclined at a predetermined angle or more.

[0002]

2. Description of the Related Art Japanese Patent Application No. Hei 7-330426 discloses an on-off valve provided in a gas supply path for supplying gas to a burner.
A vertically movable valve body is provided in a main body provided upstream or downstream, and the valve body is located on the upstream side of the valve body, moves in the main body due to the inclination of the main body, and slides by pushing the valve body from the upstream side. A gas shut-off valve provided with a mover for shutting off a gas supply path by pressing a sealing surface of a valve body against a valve seat provided on a main body has been previously proposed.

[0003]

SUMMARY OF THE INVENTION In the above prior art,
The valve body is placed on the mover by its own weight, located below and upstream of the valve seat, and the gas flow acts on the valve body in the valve closing direction. When the gas flow rate is increased, there is a possibility that the valve body is blown up by the gas flow and the gas shutoff valve closes even though the mover does not push up the valve body.
If the weight of the valve body is designed on the assumption that the gas flow velocity is high, if the gas flow rate is low such as in the case where a small amount of gas such as LP gas is sufficient or the thermal power is weakened, the gas flow is closed. The force in the valve direction becomes small, making it difficult to close the valve.
Therefore, it is difficult to set the gas flow rate in a wide range.

[0004] In view of the above problems, an object of the present invention is to provide a gas shut-off valve which is hardly affected by a gas flow rate when the valve is closed.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention is directed to a main body provided in a gas supply passage for supplying gas to a burner. A movable element for vertically moving the valve body, which is pressed against a seat to shut off the flow of gas, has a bottom surface inclined downward toward the center at an upper portion of the main body, and accommodates a spherical movable element inside. A chamber is formed, and a rod-shaped projection is formed on the upper surface of the valve body at the center of the bottom surface of the mover chamber, and the mover moves the valve element through the rod-shaped protrusion in a state where the mover is located at the center of the bottom surface. It is characterized in that the valve body is pushed down to separate the valve body from the valve seat.

In this case, compared with the combined force of the gas pressure for pressing the valve body against the valve seat while the valve body is seated on the valve seat and the upward biasing force of the spring, the movable element has its own weight. If the sum of the force for pushing down the valve element and the own weight of the valve element is large, the valve will surely open and return with the vibration settled and the mover returned to the center of the bottom surface of the mover chamber.

In addition, the sum of the force for pushing down the valve element by the weight of the movable element and the own weight of the valve element is the force due to the gas pressure that presses the valve element against the valve seat while the valve element is seated on the valve seat, and the spring. If the force is set to be smaller than the resultant force with the upward urging force and larger than the upward urging force alone, the valve element will not be pushed down even if the mover attempts to pass through the central portion of the bottom surface while the vibration is continuing. The valve will not be opened until the pressure on the upstream side and the pressure on the downstream side become the same.

According to another aspect of the present invention, a gas inflow chamber and a gas outflow chamber are provided in a main body provided in a gas supply path for supplying gas to a burner so as to be opposed to each other in a horizontal direction. In the middle of the gas passage communicating with the outflow chamber, a valve member urged upward by a spring and closing the gas passage at the rising end is disposed so as to be able to move up and down. A mover chamber for storing a spherical mover therein is formed, and a rod-like protrusion is formed at the upper portion of the valve member so as to protrude at the center of the bottom surface of the mover chamber. The movable member pushes down the valve member via the rod-shaped projection in the state where the gas passage is located at the portion to open the gas passage.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIG. 1, reference numeral 1 denotes a burner built in a gas appliance such as a gas table or a gas stove. And the safety valve 12 are connected in series.
On the other hand, the ignition plug 21 and the thermocouple 22 are located near the burner 1.
And are arranged. The ignition plug 21 and the thermocouple 22 are both connected to the controller 2. The ignition plug 21 ignites the burner 1 by applying a high voltage from the controller 2 to generate a spark discharge between the ignition plug 21 and the burner 1. Further, when the burner 1 is ignited, the thermocouple 22 is heated by the flame and outputs a thermoelectromotive force to the controller 2.
The controller 2 keeps the safety valve 12 open while the ignition state is detected by the thermocouple 22, but the burner 1
When the misfire has occurred, the safety valve 12 is closed. Incidentally, in the present invention, the gas shutoff valve 3 is connected further upstream of the safety valve 12. Reference numeral 4 denotes a plug for connecting a gas pipe (not shown), which is directly attached to the gas shut-off valve 3.

As shown in FIG. 2, the gas shut-off valve 3 has a valve body 31 disposed in a valve housing 30 so as to be vertically movable. The valve element 31 includes a valve base 31a formed of a lightweight material such as plastic or ceramics, and a sealing member 31b formed of a flexible material adhered to the upper surface of the valve base 31a. A rod-like projection 31c is provided on the upper surface of the valve base 31a, and a guide cylinder 30a formed on the valve housing 30 is provided.
The valve element 31 is guided in the up-down direction by inserting the projection 31c into the valve body 31. On the other hand, the valve housing 30 has a lower gas inflow chamber 32 connected to the inflow port, an upper gas outflow chamber 33 connected to the outflow port, a gas inflow chamber 32 and a gas outflow chamber 3.
3 and a valve seat 35 having a valve hole 35a communicating therewith. The gas inflow chamber 32 is closed by a lid plate 34. A coil-shaped spring 34a is contracted between the cover plate 34 and the valve element 31, and the valve element 31 is constantly urged upward by the spring 34a.

A movable member 37 made of a steel ball is incorporated in the valve housing 30 further above the gas outflow chamber 33 and the cover plate 3 is provided.
A mover chamber 36 sealed by 6a is formed.
A concave portion 36b having a relatively small diameter is formed at the center of the bottom surface of the mover chamber 36. Further, a slope 36c is formed so as to be inclined toward the concave portion 36b.

By the way, in the embodiment shown in FIG.
In a state where the valve element 31 is seated on the valve seat 35, the combined force between the force by the gas pressure acting on the lower surface of the valve element 31 and pressing the valve element 31 against the valve seat 35 and the upward biasing force by the spring 34a is obtained. In comparison, the sum of the force of pushing down the valve element 31 by the weight of the movable element 37 and the weight of the valve element 31 is set to be larger.

The guide cylinder 30a is open in the recess 36b of the mover chamber 36, and the tip of the projection 31c protruding from the valve base 31a moves up and down in the recess 36b in accordance with opening and closing of the valve element 31. It has become. Therefore, as shown in FIG. 2, when the mover 37 is fitted in the concave portion 36b, the mover 37 pushes down the tip of the projection 31c by a predetermined distance, which is the valve opening distance, so that the seal member 31b of the valve body 31 moves to the valve seat 35. And the gas flows from the gas inflow chamber 32 to the gas outflow chamber 33 through the valve hole 35a.

The recess 36b has a relatively small diameter (for example,
When the diameter of the mover 37 is 18 mm, the hole diameter is 4 m.
m), when vibration acts on the gas shut-off valve 3, the mover 37 is disengaged from the concave portion 36b and moves on the slope 36c as shown in FIG. The mover 37 has the concave portion 36b
When it comes off, the tip of the projection 31c is released, so that the valve body 3
1 is raised by the urging force of the spring 34a, and the sealing member 31b
The sealing surface, which is the tip of an annular protrusion formed continuously around the periphery of the valve seat, is pressed against the valve seat 35. As a result, the valve hole 35a is closed by the urging force of the spring 34a and the gas pressure acting on the lower surface of the valve body 31, and the gas flow from the gas inflow chamber 32 to the gas outflow chamber 33 is shut off. When the gas flow is shut off in this manner, the burner 1 extinguishes fire, and the thermoelectromotive force from the thermocouple 22 decreases, so that the controller 2 closes the safety valve 12. Thereafter, when the vibration stops acting, the mover 37 descends on the inclined surface 36c and re-enters the concave portion 36b, pushes down the valve element 31 and returns to the valve-open state shown in FIG.

By the way, particularly in a gas appliance such as a gas stove, when a person hits or carries, the vibration is applied. Therefore, even if a small amount of vibration is applied, the gas is not shut off. It may be desirable to shut off the gas supply only occasionally. 2 and 3, the gas can be sufficiently shut off even when falling down, but the gas is shut off even when some vibration is applied. Therefore, as shown in FIGS.
6b has a relatively large diameter (for example, the diameter of the mover 37 is 18 m
m, the hole diameter was 9 mm). With this configuration, the mover 37 does not come off the concave portion 36b even if a slight vibration acts on the gas shut-off valve 3. However, as shown in FIG. In the case where the movable element 37 is tilted more than (for example, 50 degrees),
Is removed from the concave portion 36b to shut off the gas.
Thus, the diameter of the concave portion 36b may be set according to the type of the gas appliance.

By the way, in each of the above embodiments, the valve element 31 is used.
Is inserted into the guide cylinder 30a to guide the valve element 31 in the vertical direction. However, in order to smoothly move the valve element 31 up and down, the guide cylinder 30a
Requires a certain amount of clearance between the inner peripheral surface and the projection 31c. However, if the gap is too wide, the valve body may be tilted. In particular, if the valve body 31 is tilted while the seal member 31b is seated on the valve seat 35, the sealing performance is impaired. Therefore, as shown in FIG. 6, the upper surface of the valve base 31a and the sealing member 3
1b was curved, and the sealing surface formed on the upper surface of the sealing member 31b was made spherical. With such a configuration, even when the valve element 31 is slightly inclined, the sealing surface is pressed against the entire inner peripheral edge of the valve seat 35 to reliably shut off gas.

In addition to the above-described embodiment, for example, as shown in FIG. 7, a gas inflow chamber 32 and a gas outflow chamber 33 are provided to face in the horizontal direction, and the gas inflow chamber 32 and the gas outflow chamber 33 are connected to each other. The valve member 5 may be provided so as to be vertically movable in the middle of the gas passage 6 through the passage 6. The valve member 5 is urged upward by a spring 34a. The valve member 5 has a spool portion 51 having a diameter reduced at an intermediate portion, and a rod-shaped projection 52 formed above the spool portion 51. The protrusion 52 protrudes into the concave portion 36b of the mover chamber 36. When the mover 37 is fitted in the concave portion 36b as shown in the drawing, the valve member 5 resists the urging force of the spring 34a via the protrusion 52. It has been pushed down. In the depressed state, the spool portion 51 coincides with the gas passage 6, and the gas inflow chamber 32 and the gas outflow chamber 33 communicate with each other via the gas passage 6. When vibration is applied, the mover 37 is disengaged from the concave portion 36b and the valve member 5 is disengaged from the spring 34a as in the above-described embodiment.
It moves upward by the urging force of. Then the spool part 51
Is released from the gas passage 6 and the gas passage 6 is closed by the valve member 5. When the vibration stops acting, the mover 37 returns to the inside of the concave portion 36b again, so that the valve member 5 is pushed down and the gas passage 6 is opened.

By the way, the valve member 5 may be formed in the shape shown in FIG. 8A, but when it is desired to increase the gas flow rate, a valve hole 53 long in the lateral direction is formed as shown in FIG. 8B. Provided,
The opening area may be increased. Further, as shown in FIG. 9, the concave portion 36b may be formed to have a relatively large diameter so that the concave portion 36b does not operate when the vibration is applied lightly but only when it is inclined by a predetermined angle or more.

Further, as another embodiment, the sum of the force for pushing down the valve element 31 by the weight of the movable element 37 and the weight of the valve element 31 is determined by the valve element 3 when the valve element 31 is seated on the valve seat.
1 and a spring 34a by gas pressure for pressing the valve 1 against the valve seat 35
Is smaller than the resultant force with the upward biasing force of
The biasing force of a may be larger than the biasing force alone. With this setting, while the gas pressure is acting on the valve element 31, the movable element 37
If the user tries to push down the projection 31c, the valve body 31 does not fall in the closed state. Therefore, a small-diameter vent hole 31d is provided in the valve base 31a as shown in FIG. Valve element 31
Is opened, the burner 1 extinguishes, and the controller 2
2 by detecting a decrease in the thermoelectromotive force of the safety valve 12
After the valve is closed, gas passes through the gas vent hole 31d and the gas
1 and the pressure on the upstream side of the valve body 31 becomes equal to the pressure on the downstream side, so that the gas pressure has no force to push up the valve body 31,
Is pushed down and the valve is opened. With this setting, the gas shutoff valve 3 can be returned to the open state after the safety valve 12 is closed.

In the above embodiment, the concave portion 36b is not necessarily provided if the inclined surface 36c is formed. Further, a frame rod may be used instead of the thermocouple 22. Further, the slope 36c may be formed to be a curved surface. In addition, the present invention provides a safety valve 12 and a thermocouple 2.
2 can be applied to a type in which the safety valve 12 is closed by direct electrical connection with the thermocouple 2 and the thermoelectromotive force of the thermocouple 22 decreases. Although the safety valve 12 is arranged downstream of the gas shut-off valve 3 in the embodiment shown in FIG. 1, it may be arranged upstream of the gas shut-off valve 3.

[0021]

As is apparent from the above description, according to the gas shut-off valve of the present invention, since the valve element is pressed by the mover, there is no possibility of malfunction even if the gas flow is fast. Even if the speed is slow, the operation can be reliably performed by pushing the valve body upward by the urging force of the spring.

[Brief description of the drawings]

FIG. 1 is a diagram showing an application state of a gas shut-off valve of the present invention.

FIG. 2 is a cross-sectional view showing the first embodiment of the present invention.

FIG. 3 is a sectional view showing a state where vibration is applied;

FIG. 4 is a sectional view showing a second embodiment.

FIG. 5 is a cross-sectional view showing a state in which the lens is inclined at a predetermined angle or more.

FIG. 6 is a cross-sectional view illustrating a third embodiment.

FIG. 7 is a cross-sectional view showing a fourth embodiment.

FIG. 8 is a view showing the shape of a valve member.

FIG. 9 is a sectional view showing a fifth embodiment.

FIG. 10 is a sectional view showing a sixth embodiment;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Burner 2 Controller 3 Gas cutoff valve 31 Valve body 37 Mover 35 Valve seat

Claims (5)

[Claims] 1. A vertically movable body which is urged upward by a spring in a main body provided in a gas supply path for supplying gas to a burner, and is pressed against a valve seat at a rising end to shut off a gas flow. At the top of the main body, a movable element chamber is formed at the top of the main body, the bottom surface of which is inclined downward toward the center, and a spherical movable element is stored inside the movable element chamber. That the movable element pushes down the valve element via the rod-shaped projection in a state where the movable element is located at the central part of the bottom surface, and separates the valve element from the valve seat. Characteristic gas shut-off valve. 2. The valve according to its own weight, compared with the combined force of the gas pressure pressing the valve body against the valve seat while the valve body is seated on the valve seat and the upward biasing force of the spring. 2. The gas shut-off valve according to claim 1, wherein the sum of the force for pushing down the body and the weight of the valve body is large. 3. The sum of the force of pushing down the valve element by the weight of the mover and the own weight of the valve element is a force due to gas pressure that presses the valve element against the valve seat while the valve element is seated on the valve seat. 2. The gas shut-off valve according to claim 1, wherein the combined force with the upward urging force is smaller than the combined force with the upward urging force alone. 4. The gas shut-off valve according to claim 1, wherein a sealing surface formed on an upper surface of the valve body is formed in a spherical shape. 5. A gas inflow chamber and a gas outflow chamber are provided in a main body interposed in a gas supply path for supplying gas to a burner in a horizontal direction, and the gas inflow chamber and the gas outflow chamber are provided in the main body. A valve member which is urged upward by a spring and closes the gas passage at the rising end thereof is disposed in the middle of the gas passage communicating with the valve so as to be able to move up and down. A mover chamber for storing a spherical mover is formed inside, and a rod-shaped protrusion is formed at the top of the valve member to project from the center of the bottom of the mover chamber. A gas shut-off valve characterized in that the movable element pushes down a valve member via a rod-shaped projection in a state in which the gas passage is opened to open a gas passage.