JP3698859B2 - Gas shut-off valve - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a gas shut-off valve that is interposed 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]
[Prior art]
In Japanese Patent Application No. 8-243327, the main body provided in the gas supply passage for supplying gas to the burner is urged upward by a spring and pressed against the valve seat at the rising end to block the gas flow. A movable valve body is provided that has a mortar-shaped inclined portion in which at least a part of the bottom surface is inclined downward toward the inside, and a spherical movable element is housed in the upper portion of the main body. A child chamber is formed, and a rod-shaped protrusion protruding from the bottom portion of the inclined portion is formed on the upper surface of the valve body, and the movable element is moved through the rod-shaped protrusion while the movable element is positioned at the bottom portion of the inclined portion. A gas shut-off valve that has been pushed down so that the valve body is separated from the valve seat and opened is proposed previously.
[0003]
The gas supply passage for supplying gas to the burner of the gas appliance has a thermal power control valve upstream of the burner, and a safety valve for misfire that is opened and maintained in the ignition state of the burner and closed in the fire extinguishing state upstream of the burner. The gas shutoff valve is interposed further upstream of the safety valve. When vibration of a certain level or more acts on the gas shut-off valve due to an earthquake or the like, the mover is detached from the bottom portion of the inclined portion. When the mover pressed from above is released, the valve element is lifted by the urging force of the spring and is pressed against the valve seat at the rising end to block the gas flow. When the valve body cuts off the gas flow, a gas supply pressure acts on the upstream side of the valve body, and the valve body is pressed against the valve seat by the supply pressure together with the biasing force of the spring to close the valve. When the gas flow is interrupted, the burner extinguishes and the safety valve is closed by the fire extinguishing.
[0004]
When the inclination angle of the inclined portion or a hole in which the mover fits in the bottom portion of the inclined portion is provided, the strength of the vibration that causes the mover to deviate from the bottom portion of the inclined portion is set by adjusting the size of the hole. be able to.
[0005]
[Problems to be solved by the invention]
In the above-described conventional apparatus, when the gas shut-off valve is attached to the gas appliance, the main body of the gas shut-off valve may be inclined obliquely in a state of being attached to the gas appliance due to a dimensional error of each component. If the main body of the gas shut-off valve is attached at an angle, the angle of inclination becomes smaller on one side of the inclined portion, so that the mover is easily detached from the bottom portion of the inclined portion.
[0006]
By the way, vibration acceleration, which is acceleration acting on a vibrating object, is
Vibration acceleration = (2π × frequency) ² × amplitude. The vibration acceleration is small when the amplitude is small even if the vibration due to the earthquake acts on the gas shut-off valve, and the mover does not come off the bottom part of the inclined part, but when the amplitude becomes large, the vibration acceleration exceeds the predetermined value, Detach from the bottom of the ramp. On the other hand, the frequency of vibration generated when a gas appliance is struck is higher than the frequency of vibration generated by an earthquake. Therefore, even if the amplitude of the vibration generated when hitting a thing is small, the frequency is high and the vibration acceleration increases, and the mover may come off the bottom portion of the inclined portion and malfunction.
[0007]
Therefore, in view of the above problems, the present invention is a gas cutoff valve that does not shut off gas until a vibration of a set magnitude or more is applied, and does not malfunction due to high-frequency vibration in a state where it is attached to a gas appliance. It is an issue to provide.
[0008]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention forms a mortar-shaped inclined portion which is provided with a vertically movable valve body and is inclined downward toward the inside in a main body attached to a gas appliance provided with a burner. The spherical movable element is placed on the inclined portion, and when the movable element is positioned at the bottom portion of the inclined portion, the valve body is held at the lower end and is opened to flow gas to the burner. In the gas shut-off valve that stops the gas supply to the burner by moving the valve body to the rising end when the valve body is removed from the bottom portion, the body posture with respect to the gas appliance is changed with the body attached to the gas appliance. A posture adjusting mechanism that can be variably adjusted is provided , the posture adjusting mechanism has a damper member made of an elastic body, and the main body is attached to the gas appliance via the damper member .
[0009]
When the gas shut-off valve is attached to the gas appliance, even if the main body of the gas shut-off valve is tilted, the posture is adjusted by the adjusting mechanism so as to eliminate the tilt while the gas shut-off valve is attached to the main body. When the inclination is eliminated in this way, the gas shut-off valve shuts off the gas with the same sensitivity to vibrations in any direction. Also, when the gas shut-off valve body is attached to the gas appliance via a damper member made of an elastic body, the damper member acts as a kind of filter that prevents the transmission of high-frequency vibration, and the high-frequency vibration is transmitted from the gas appliance to the main body. Not communicated to. Since low frequency vibrations are transmitted to the main body without being attenuated, the sensitivity of the gas appliance is not affected.
[0010]
In another aspect of the present invention, a vertically movable valve body is disposed in a main body attached to a gas appliance provided with a burner, and a mortar-shaped inclined portion inclined downward toward the inside is formed. A spherical mover is placed on the bottom, and when the mover is located at the bottom of the inclined part, the valve element is held at the descending end and the valve is opened to flow gas to the burner. In the gas shut-off valve that stops the gas supply to the burner when the valve body moves to the rising end when it deviates from the minute, and stops the gas supply to the burner, The damper member is interposed, and the vibration is transmitted from the gas appliance to the main body through the damper member.
[0011]
When the main body of the gas shut-off valve is attached to the gas appliance via a damper member made of an elastic body, the damper member acts as a kind of filter that prevents transmission of high-frequency vibration, and high-frequency vibration is transmitted from the gas appliance to the main body. I don't get it. Since low frequency vibrations are transmitted to the main body without being attenuated, the sensitivity of the gas appliance is not affected.
[0012]
In addition , when adjusting the attitude | position of the main body of a gas cutoff valve in the state attached to the gas appliance, if it attaches to the main body of a gas cutoff valve, it will be easy to adjust.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Referring to FIG. 1, B is a burner built in a gas appliance such as a gas table or a gas stove. A gas supply path for supplying gas to the burner B is provided with a safety valve SV and a heating power control in order from the upstream side. The thermal power control valve V is connected in series. On the other hand, an ignition plug SP and a thermocouple TC are disposed in the vicinity of the burner B. The spark plug SP and the thermocouple TC are both connected to the controller C, and the spark plug SP ignites the burner B by applying a high voltage from the controller C and generating a spark discharge with the burner B. When the burner B is ignited, the thermocouple TC is heated by the flame and the thermoelectromotive force is output to the controller C. The controller C keeps the safety valve SV open while detecting the ignition state by the thermocouple TC, but closes the safety valve SV when the burner B is extinguished. In this embodiment, the gas cutoff valve 1 according to the present invention is connected further upstream of the safety valve SV.
[0014]
As shown in FIG. 2, the movable member chamber 2 was formed in the substantially upper half of the valve casing 10 as the main body. And the needle | mover 3 which consists of a steel ball was stored in the inside of the needle | mover room 2, and the needle | mover room 2 was sealed airtight with respect to the exterior. The mover chamber 2 is formed in a bottomed cylindrical shape, and a mortar-shaped inclined portion 22 is formed on the bottom surface so as to incline downward. In the bottom portion of the inclined portion 22, a communication hole 23 is opened in which a tip 53 of a rod-like protrusion 50 described later faces. Therefore, in a state where no vibration is generated, the mover 3 is fitted into the communication hole 23 and stably held.
[0015]
A valve chamber 4 is formed in the lower half of the valve housing 10. An inflow portion 41 through which gas flows in and an outflow portion 42 through which gas flows out communicate with each other via the valve chamber 4. A valve seat 43 is formed inside the valve chamber 4. A valve body 5 urged upward by a spring 51 is disposed in the valve chamber 4 so as to be movable up and down. An annular seal member 52 is attached to the upper surface of the valve body 5. When the valve body 5 is pushed upward by the spring 51, the seal member 52 is pressed against the valve seat 43. Then, the communication from the inflow part 41 to the outflow part 42 is cut off, and the gas does not flow downstream from the outflow part 42. In a state where vibration does not act, the tip 53 of the rod-like protrusion 50 extending upward from the central portion of the valve body 5 is pushed by the mover 3 and the entire valve body 5 is lowered. In this state, the valve body 5 is in a valve open state in which the seal member 52 is separated from the valve seat 43. The weight of the mover 3 needs to be set so that it can overcome the urging force of the spring 51 and push down the valve body 5 downward. However, when the seal member 52 is pressed against the valve seat 43 to be in a closed state, the gas supply pressure acts on the upstream surface (lower surface) of the valve body 5 via the inflow portion 41, and the urging force of the spring 51. At the same time, since the valve body 5 is pushed upward, the valve body 5 cannot be pushed down by the weight of the mover 3 and remains in the closed state. Therefore, when the bypass hole 54 is formed in the valve body 5, the valve body 5 is closed, the burner B is extinguished, and the safety valve SV provided downstream of the gas shut-off valve 1 is closed, the gas is passed through the bypass hole 54. It gradually flows between the shut-off valve 1 and the safety valve SV, and when the pressure on the downstream side of the valve body 5 is brought close to the gas supply pressure and the vibration is stopped and the movable element 3 returns to the communication hole 23, only the weight of the movable element 3 is obtained. The valve body 5 is pushed down to automatically return to the valve open state.
[0016]
The gas shut-off valve 1 includes an attitude adjustment mechanism 6, and the valve housing 10 is attached to the gas appliance GT via the attitude adjustment mechanism 6. The posture adjusting mechanism 6 includes a holding plate 61 that is screwed directly to the valve housing 10 and a fixing plate 62 that is screwed to the gas appliance GT side. As shown in FIG. 3, the holding plate 61 is screwed to the upper surface of the gas cutoff valve 1 in advance. A groove 63a is formed on the outer peripheral surface of the cylindrical rubber bush 63 as a damper member, and the bush 63 is fitted so that the groove 63a engages with the engagement groove 62a formed on the fixed plate 62. Then, the screw 64 is inserted into the bush 63 from above, and the valve housing 10 is held so as to be suspended from the fixed plate 62 by screwing the screw 64 into the holding plate 61. The posture of the valve housing 10 can be adjusted by changing the screwing amount of the three screws 64. Therefore, even if the posture of the valve housing 10 is inclined due to an assembly error or the like, the inclination of the valve housing 10 can be adjusted by adjusting the screwing amount of each of the screws 64. By the way, the swing-down level 7 is attached by inserting into two slit holes 65 provided in the holding plate 61 fixed to the valve housing 10. At the time of posture adjustment, if the posture of the valve casing 10 is adjusted while looking at the level 7, the adjustment can be easily performed, so that the time required for the adjustment can be shortened. For example, a bubble level may be used in addition to the downward swing level.
[0017]
According to the above configuration, the holding plate 61 and the fixed plate 62 are in contact with each other via the bush 63. For example, the frequency of vibration caused by a collision with the gas appliance GT is relatively large. The fixing plate 62 screwed directly to the gas appliance GT vibrates together with the gas appliance GT, but the vibration is absorbed by the bush 63 due to the elastic deformation of the bush 63 and is suspended through the bush 63. No vibration is transmitted to 10. However, in the case of vibration with a low frequency such as vibration caused by an earthquake, if the fixing plate 62 vibrates together with the gas appliance GT, the amount of elastic deformation of the bush 63 does not increase, and the vibration is transmitted to the valve housing 10. Vibrates with 62. When the vibration transmitted to the valve housing 10 exceeds a certain magnitude, the mover 3 is detached from the communication hole 23 and the gas cutoff valve 1 is closed. In the above embodiment, the bush 63 is sandwiched between the holding plate 61 and the fixed plate 62 and compressed. As the reaction force of the compression, the screw 64 is biased in the direction of pulling upward with respect to the holding plate 61, so that the screw 64 is less likely to loosen with respect to the holding plate 64.
[0018]
By the way, in addition to the above embodiment, for example, as shown in FIG. 4, the side surface of the gas shut-off valve 1 is attached to the gas appliance GT via the rubber connecting member 8, and A rubber screwing member 9 is fixed to the gas fitting GT, and two screws 92 inserted through a fixing plate 93 screwed to the gas appliance GT side are screwed into the screwing member 9 so that the gas shut-off valve 1 is fixed to the fixing plate 93. To hang on. The screwing member 9 is formed by fitting a nut to the upper end of a rubber hollow member, and the tip of the screw 92 is configured not to directly contact the gas cutoff valve 1. Therefore, also in this configuration, the posture of the gas shut-off valve can be adjusted by adjusting the tightening amount of the screw 92, and vibration with a large frequency is attenuated by the connecting member 8 and the screwing member 9 to shut off the gas. It is not transmitted to the valve housing of the valve 1.
[0019]
In the above embodiment, the gas cutoff valve 1 is disposed upstream of the safety valve SV. However, the gas cutoff valve 1 may be disposed downstream of the safety valve SV. In this case, the burner B is extinguished by closing the valve body 5, and when the safety valve SV is closed, the gas pressure is sealed between the gas cutoff valve 1 and the safety valve SV, and the valve body 5 is held open. Then, gas gradually escapes from the valve chamber 4 to the gas outflow portion 42 side through the bypass hole 54 and the valve chamber 4 becomes atmospheric pressure. Both the pressure in the valve chamber 4 and the pressure in the gas outflow portion 42 become atmospheric pressure. It becomes equal to each other and automatically opens.
[0020]
Further, the movable member chamber 2 is formed above the valve body 5 and the upwardly biased valve body 5 is pushed down by the movable member 3. However, the movable member is disposed below the valve body to vibrate. The present invention may be applied to a gas shut-off valve that lifts and closes the valve body with a mover when the actuates.
[0021]
【The invention's effect】
As is apparent from the above description, according to the gas shut-off valve of the present invention, the posture of the gas shut-off valve can be adjusted by the posture adjusting mechanism even if the mounting posture with respect to the gas appliance is tilted, and is smaller than the set size. There is no fear that the gas shut-off valve is activated by vibration and the gas supply to the burner is stopped.
[0022]
In addition, by attaching the gas shut-off valve to the gas appliance via a damper member, high-frequency vibration that occurs when a gas appliance is struck is not transmitted to the gas shut-off valve, preventing malfunction due to the vibration. it can.
[Brief description of the drawings]
FIG. 1 is a view showing an application state of a gas shut-off valve according to the present invention. FIG. 2 is a cross-sectional view showing a first embodiment of the present invention. ] Perspective view showing the second embodiment [Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Gas cutoff valve 2 Movable child chamber 3 Movable child 4 Valve chamber 5 Valve body 6 Attitude adjustment mechanism 7 Level

Claims (3)

A vertically movable valve body is arranged in a main body attached to a gas appliance provided with a burner, and a mortar-shaped inclined portion inclined downward is formed on the inside, and a spherical movable element is mounted on the inclined portion. In the state where the movable element is located at the bottom portion of the inclined portion, the valve body is held at the lower end and is opened to flow gas to the burner. in the gas shutoff valve to stop the supply of gas to move to the burner becomes closed, a state of attaching the body to a gas appliance, the posture adjusting mechanism capable of variably adjusting the orientation of the body relative to the gas appliance provided, the A gas shut-off valve characterized in that the posture adjustment mechanism has a damper member made of an elastic body, and the main body is attached to the gas appliance via the damper member .     A vertically movable valve body is arranged in a main body attached to a gas appliance provided with a burner, and a mortar-shaped inclined portion inclined downward is formed on the inside, and a spherical movable element is mounted on the inclined portion. In the state where the movable element is located at the bottom portion of the inclined portion, the valve element is held at the descending end and is opened to flow the gas to the burner. In the gas shut-off valve that moves to the closed position and stops the gas supply to the burner, when attaching the main body to the gas appliance, a damper member made of an elastic body is interposed between the main body and the gas appliance, A gas cutoff valve characterized in that vibration is transmitted from an instrument to a main body via a damper member. The gas cutoff valve according to claim 1 or 2 , wherein a level is attached to the main body .

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