JP2018013251A - Gas valve device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To avoid an increase in power consumption of an electric motor due to an increase in sliding resistance of a valve seat member caused by a seal member, in a gas valve device in which valve elements 22, 32 and valve seats 21, 31 on which the valve elements can be seated, are provided in a cylindrical valve casing 1, and in the valve casing 1, the valve seat member 6 is provided, which moves in the axial direction interlockingly with an operation rod 4 driven in the axial direction by the electric motor 5, the valve seats 21, 31 are formed at the axial ends of the valve seat member, and the seal member is provided for sealing a gas between the inner peripheral surface of the casing 1 and the outer peripheral surface of the valve seat member 6 to prevent a gas from flowing in the gap.SOLUTION: A seal member is formed of a bellofram 7 in which the outer peripheral portion 71 is fixed to a valve casing 1 and the inner peripheral portion 72 is fixed to a valve seat member 6. Preferably, the valve casing 1 is divided in the axial direction, and the outer peripheral portion 71 of the bellofram 7 is sandwiched between the divided two portions 12, 13.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a gas valve device in which a valve body and a valve seat on which a valve body can be seated are provided in a cylindrical valve casing through which gas flows.

  Conventionally, as a gas valve device in which an electromagnetic safety valve and an opening / closing valve are incorporated in a cylindrical valve casing, according to Patent Document 1, a shaft is linked to an operation rod driven in the axial direction by an electric motor in the valve casing. The thing provided with the valve-seat member which moves to a direction is known. Here, the electromagnetic safety valve is a suction member that is connected to a valve body that can be seated on a valve seat for a safety valve formed at one end of the valve seat member in the axial direction and a valve shaft that extends to the valve body in one axial direction. A valve body fixed to the operating rod that can be seated on the valve seat for the on-off valve formed at the other end in the axial direction of the valve seat member. I have. Further, in the valve casing, a biasing means for biasing the valve seat member in the other axial direction, and a movement of the valve seat member in the other axial direction, the valve body of the electromagnetic safety valve can be seated on the safety valve seat. Stopper means for stopping in position is provided.

  In this case, when the operating rod is moved in one axial direction, the valve body of the on-off valve is seated on the valve seat for the on-off valve, and thereafter, the valve seat member is operated by the pressing force acting via the valve body of the on-off valve. Moves in one axial direction in conjunction with the rod. Then, the valve seat for the safety valve comes into contact with the valve body of the electromagnetic safety valve, the valve body is pushed by the valve seat member and moves in one axial direction, and reaches the valve opening position where the attracting piece comes into contact with the electromagnet. In this state, the electromagnet is energized to attract the valve body of the electromagnetic safety valve to the open position, and then the operating rod is moved in the other axial direction. As a result, the valve seat member moves in the other axial direction following the operating rod by the urging force of the urging means, and the electromagnetic valve is opened away from the valve body where the valve seat for the safety valve is attracted to the valve opening position. The Thereafter, after the valve seat member returns to the predetermined position where it is restrained by the stopper means, the operating shaft rod is further moved in the other axial direction, so that the valve body of the on-off valve is separated from the on-off valve seat and the on-off valve is The valve is opened.

  Here, in the above-described conventional example, an O-ring is provided on the outer peripheral surface of the valve seat member as a seal member that seals gas from flowing into the gap between the inner peripheral surface of the valve casing and the outer peripheral surface of the valve seat member. Wearing. However, the O-ring is compressed between the outer peripheral surface of the valve seat member and the inner peripheral surface of the valve casing to ensure sealing performance, and has a sliding resistance when moving the valve seat member in the axial direction. growing. Therefore, the electric power consumption of an electric motor becomes large, and when using a dry battery as a power supply, there exists a malfunction which shortens a battery life.

  The valve seat member that moves in the axial direction in conjunction with the operation rod driven in the axial direction by the electric motor in the valve casing is not limited to the gas valve device in which the electromagnetic safety valve and the on-off valve are incorporated in the valve casing. If the O-ring that seals the gap between the outer peripheral surface of the valve seat member and the inner peripheral surface of the valve casing is mounted on the outer peripheral surface of the valve seat member, the same problem as described above occurs.

JP 2013-68356 A

  In the present invention, in view of the above points, the sliding resistance of the valve seat member is increased by the seal member that seals the gas from flowing into the gap between the inner peripheral surface of the valve casing and the outer peripheral surface of the valve seat member. Accordingly, an object of the present invention is to provide a gas valve device that can avoid an increase in power consumption of an electric motor.

  In order to solve the above problems, the present invention provides a gas valve device in which a valve body and a valve seat on which a valve body can be seated are provided in a cylindrical valve casing through which gas flows. A valve seat member that moves in the axial direction in conjunction with an operation rod that is driven in the axial direction by an electric motor is provided in the casing. A valve seat is formed at the axial end of the valve seat member, and the valve In the case where a seal member is provided for sealing so that gas does not flow in the gap between the inner peripheral surface of the casing and the outer peripheral surface of the valve seat member, the outer peripheral portion of the seal member is fixed to the valve casing. Is constituted by a bellophram fixed to the valve seat member.

  According to the present invention, when the sealing member is made of belofram, the sliding resistance of the valve seat member is greatly reduced as compared with the conventional example using an O-ring as the sealing member. Therefore, the power consumption of the electric motor can be reduced and the battery life can be extended.

  By the way, it is also considered that a radial step portion is formed on the inner peripheral surface of the valve casing, and the outer peripheral portion of the bellophram is pressed against the step portion with a spring to ensure the sealing property between the outer peripheral portion of the bellofram and the valve casing. However, in this case, it is necessary to carefully insert the belofram into the valve casing so that portions other than the outer peripheral portion interfere with the stepped portion or the outer peripheral portion does not exceed the stepped portion. It becomes troublesome. On the other hand, if the valve casing is divided in the axial direction and the outer peripheral portion of the belofram is sandwiched between one portion and the other portion of the valve casing, the assembling workability is improved.

  In the present invention, the valve seat member is slidably contacted with the inner peripheral surface of the valve casing at a part in the axial direction of the outer peripheral surface of the valve seat member so that the valve seat member does not move in the radial direction due to the radial deflection of the bellophram. An annular protrusion must be formed. However, if only the annular protrusion is provided, the valve seat member may be inclined with the annular protrusion as a fulcrum, and the valve seat member may be twisted with respect to the valve casing. Therefore, in the present invention, not only the above-described annular protrusion is provided, but also the valve seat member is prevented from inclining in a portion spaced apart from the annular protrusion of the valve seat member in close proximity to the inner peripheral surface of the valve casing. It is desirable to provide a guide part.

  Furthermore, in the present invention, it is desirable that the belofram is composed of a rubber molded product that is molded in a state where its inner peripheral portion is embedded in the valve seat member. According to this, the inner peripheral part of the bellophram can be securely adhered to the valve seat member, and the sealing performance can be ensured.

  In this case, a cylindrical portion integral with the bellophram is provided, extending in the axial direction from the inner peripheral portion of the bellophram to the inside of the valve seat member so that the end portion is exposed to the valve seat, and by the end portion of the cylindrical portion exposed to the valve seat If a valve seal that secures the sealing performance when the valve element is seated on the valve seat is configured, it is not necessary to provide a separate valve seal, and the cost can be reduced.

  In addition, it is a gas valve device in which an electromagnetic safety valve and an on-off valve are incorporated in a valve casing, and the electromagnetic safety valve is a safety valve valve formed at one end in the axial direction of the valve seat member, as in the above-described conventional example. A valve body that can be seated on the seat, an adsorbing piece that is connected to the valve element via a valve shaft that extends in one axial direction, and an electromagnet that faces the adsorbing piece. An urging means for urging the valve seat member in the axial direction in the valve casing, comprising a valve body fixed to the operating rod, which can be seated on a valve seat for the on-off valve formed on the other end; And a stopper means for stopping the movement of the member in the other axial direction at a predetermined position where the valve body of the electromagnetic safety valve can be seated on the valve seat for the safety valve. When providing a cylindrical part that is integral with the bellophram that extends in the direction, Is exposed to the valve seat for the on-off valve, and the valve seal for the on-off valve that secures the sealing performance when the valve body of the on-off valve is seated on the valve seat for the on-off valve may be configured by the end of this cylindrical portion .

Sectional drawing of the gas valve apparatus of 1st Embodiment of this invention. Operation | movement explanatory drawing of the gas valve apparatus of 1st Embodiment. Sectional drawing of the gas valve apparatus of 2nd Embodiment of this invention. Sectional drawing of the gas valve apparatus of 3rd Embodiment of this invention. Sectional drawing of the gas valve apparatus of 4th Embodiment of this invention.

  Referring to FIG. 1, a gas valve device according to an embodiment of the present invention includes a tubular valve casing 1 and an electromagnetic safety valve 2 disposed in a portion closer to one axial direction (right side in FIG. 1) in the valve casing 1. And an open / close valve 3 arranged in series with the electromagnetic safety valve 2 at a portion closer to the other axial direction (left side in FIG. 1) in the valve casing 1, and an operation rod 4 inserted into the valve casing 1 from the other axial direction. And an electric motor 5 mounted on the outer end surface of the box 11 attached to the other end of the valve casing 1 in the axial direction, and provided in the valve casing 1 so as to move in the axial direction in conjunction with the operation rod 4. And a valve seat member 6 made of metal such as brass or aluminum alloy.

  A nut 52 is fixed to the output shaft 51 of the electric motor 5, and a male screw portion 41 formed at the other end portion in the axial direction of the operation rod 4 is screwed into the nut 52. The operation rod 4 is reciprocated in the axial direction by forward and reverse rotation of the electric motor 5.

  The valve casing 1 is provided with a gas inlet 1 a located on the upstream side of the electromagnetic safety valve 2 and a gas outlet 1 b located on the downstream side of the on-off valve 3. When both the electromagnetic safety valve 2 and the on-off valve 3 are opened, gas flows from the gas inlet 1a to the gas outlet 1b, and the gas is supplied to a burner of a gas appliance such as a stove (not shown).

  The electromagnetic safety valve 2 includes a safety valve valve seat 21 formed at one end of the valve seat member 6 in the axial direction, a rubber valve body 22 that can be seated on the valve seat 21, and the valve body 22 in the other axial direction. A valve spring 23 that is energized to be seated on the safety valve valve seat 21, a suction piece 24 that is connected to the valve body 22 via a valve shaft 22 a extending in one axial direction, and an electromagnet 25 that faces the suction piece 24. ing. Then, by energizing the electromagnet 25 in a state where the valve element 22 is pushed against the valve spring 23 to the valve opening position where the attraction piece 24 contacts the electromagnet 25, the valve element 22 is attracted and held at the valve opening position. Is done. When the burner misfire is detected by the flame detection element attached to the burner, the energization to the electromagnet 25 is stopped, and the valve element 22 is returned to the valve closing position where the valve spring 23 is seated on the safety valve seat 21. Thus, the electromagnetic safety valve 2 is closed to prevent gas outflow.

  In the valve casing 1, there is a radial step formed on the inner surface of the valve casing 1 that stops the movement of the valve seat member 6 in the other axial direction at a predetermined position where the valve body 22 of the electromagnetic safety valve 2 can be seated. Stopper means 61 and urging means 62 composed of a coil spring that urges the valve seat member 6 in the other axial direction and elastically holds it in the predetermined position are provided.

  The on-off valve 3 can be seated on the on-off valve valve seat 31 formed at the other end of the valve seat member 6 in the axial direction, and fixed to one end of the operating rod 4 in the axial direction. The valve body 32 is provided. The valve body 32 includes a main valve body portion 321 that is seated on the valve seat 31 so as to close the valve hole 63 opened to the valve seat member 6 so as to open to both the valve seats 21 and 31 for the safety valve and the on-off valve. And a needle valve-like sub-valve body portion 322 inserted into the valve hole 63. A rubber valve seal 32a is affixed to the end face of the main valve body 321 facing the on-off valve seat 31. Further, the valve body 32 is formed with a bypass hole 32 b that always communicates the valve hole 63 with the downstream side of the on-off valve 3, and the main valve body portion 321 is seated on the on-off valve valve seat 31. A minimum amount of gas is allowed to flow.

  According to the above configuration, when the operating rod 4 is moved in one axial direction, the valve body 32 of the on-off valve 3 is seated on the valve seat 31 for the on-off valve, and thereafter the valve seat member 6 is the valve body of the on-off valve 3. It moves in one axial direction in conjunction with the operating rod 4 by the pressing force acting via 32. Then, the safety valve seat 21 comes into contact with the valve body 22 of the electromagnetic safety valve 2, and the valve body 22 is pushed to the valve open position against the urging force of the valve spring 23 as shown in FIG. The In this state, the electromagnet 25 is energized, and the valve body 22 is attracted and held at the valve opening position. Next, the operating rod 4 is moved in the other axial direction. At this time, the valve seat member 6 follows the operating rod 4 by the urging force of the urging means 62 to a predetermined position stopped by the stopper means 61. The safety valve seat 21 moves away from the valve body 22 that is attracted and held at the valve opening position, and the electromagnetic safety valve 2 is opened. Thereafter, as shown in FIG. 2 (b), the operating rod 4 further moves in the other axial direction with respect to the valve seat member 6 restrained at a predetermined position, and the main valve body portion 321 of the valve body 32 of the on-off valve 3 opens and closes. An amount of gas suitable for ignition is supplied to the burner at a predetermined distance from the valve seat 31, and the burner is ignited. Thereafter, the gas flow rate is adjusted by the sub-valve body 322 by adjusting the position of the operation rod 4 by the electric motor 5.

  Here, in this embodiment, even if a valve closing command for the electromagnetic safety valve 2 is issued in the event of a burner misfire, the valve body 22 of the electromagnetic safety valve 2 remains held in the valve open position. By moving the rod 4 in one axial direction, the safety valve seat 21 comes into contact with the valve body 22 located at the valve opening position, the electromagnetic safety valve 2 is closed, and gas outflow is prevented. Moreover, even if the operating rod 4 is locked at the forward end position corresponding to the valve opening position of the valve body 22 of the electromagnetic safety valve 2 due to a failure of the electric motor 5 or dust biting, the electromagnetic safety valve 2 is closed. Gas release can be prevented. Therefore, fail safe can be achieved when an open failure of the electromagnetic safety valve 2 occurs or when the operating rod 4 is locked at the forward end position.

  By the way, an O-ring may be attached to the outer peripheral surface of the valve seat member 6 as a seal member that seals gas from flowing into the gap between the inner peripheral surface of the valve casing 1 and the outer peripheral surface of the valve seat member 6. Conceivable. However, the O-ring is compressed between the outer peripheral surface of the valve seat member 6 and the inner peripheral surface of the valve casing 1 to ensure the sealing performance. The O-ring slides when the valve seat member 6 is moved in the axial direction. Dynamic resistance increases. For this reason, the electric power consumption of the electric motor 5 increases, and when a dry battery is used as a power source, there is a problem that the battery life is shortened.

  Therefore, in this embodiment, the outer peripheral portion 71 is fixed to the valve casing 1 with a seal member that seals the gas from flowing into the gap between the inner peripheral surface of the valve casing 1 and the outer peripheral surface of the valve seat member 6. The inner peripheral portion 72 is constituted by a rubber bellophram 7 fixed to the valve seat member 6. According to this, the sliding resistance of the valve seat member 6 is greatly reduced as compared with a seal member using an O-ring. Therefore, the power consumption of the electric motor 5 can be reduced and the battery life can be extended.

  Further, in this embodiment, the valve casing 1 is divided into two axial portions, ie, an axial one side portion 12 surrounding the electromagnetic safety valve 2 and an axial other side portion 13 surrounding the on-off valve 3, and the axial one side is divided. An outer peripheral portion 71 of the bellophram 7 is sandwiched between the portion 12 and the other axial side portion 13.

  As in the second embodiment shown in FIG. 3, the valve casing 1 is not divided in the axial direction, and a radial step portion 1c is formed on the inner peripheral surface of the valve casing 1, and the bellowram 7 is formed on the step portion 1c. It is also conceivable that the outer peripheral portion 71 is pressed by the spring 1 d to ensure the sealing performance between the outer peripheral portion 71 of the bellophram 7 and the valve casing 1. However, in this case, the very easily deformable bellophram 7 is carefully inserted into the valve casing 1 so that portions other than the outer peripheral portion 71 do not interfere with the stepped portion 1c or the outer peripheral portion 71 does not exceed the stepped portion 1c. As a result, the assembly work becomes troublesome. On the other hand, if the outer peripheral part 71 of the bellophram 7 is sandwiched between the forward direction side portion 12 and the backward direction side portion 13 of the valve casing 1 as in the first embodiment shown in FIGS. Assembling workability is improved, which is advantageous.

  Further, in both the first and second embodiments, a part of the outer peripheral surface of the valve seat member 6 in the axial direction, for example, so that the valve seat member 6 does not move in the radial direction due to the radial deflection of the bellophram 7, for example, An annular projecting portion 64 that is slidably in contact with the inner peripheral surface of the valve casing 1 is formed at the end in the backward movement direction. However, if only the annular protrusion 64 is provided, the valve seat member 6 may tilt with the annular protrusion 64 as a fulcrum, and the valve seat member 6 may be twisted with respect to the valve casing 1.

  Therefore, in both the first and second embodiments, a portion spaced from the annular protrusion 64 of the valve seat member 6, for example, an axially intermediate portion of the valve seat member 6 is close to and opposed to the inner peripheral surface of the valve casing 1. And the guide part 65 which suppresses that the valve-seat member 6 inclines is provided. According to this, it can prevent that the valve seat member 6 inclines and produces the twist of the valve seat member 6 with respect to the valve casing 1.

  The guide portion 65 may be provided at one end of the valve seat member 6 in the axial direction as in the third embodiment shown in FIG. Further, the guide portion 65 may be annular or a plurality of guide portions 65 may be provided radially.

  Next, a fourth embodiment shown in FIG. 5 will be described. In the fourth embodiment, the belofram 7 is composed of a rubber molded product that is molded in a state where its inner peripheral portion 72 is embedded in the valve seat member 6. According to this, the inner peripheral part 72 of the belofram 7 can be reliably brought into close contact with the valve seat member 6 to ensure the sealing performance. The valve seat member 6 may be made of resin or metal.

  In the fourth embodiment, there is further provided a cylindrical portion 73 integral with the bellophram 7 that extends in the axial direction from the inner peripheral portion 72 of the bellophram 7 and the end portion is exposed to the on-off valve valve seat 31. Is provided. A valve seal 73 a that ensures sealing performance when the valve body 32 of the on-off valve 3 is seated on the on-off valve valve seat 31 is configured by the end of the cylindrical portion 73 exposed to the on-off valve valve seat 31. . According to this, it is not necessary to attach a separate valve seal 32a to the valve body 32 as in the first to third embodiments, and the cost can be reduced.

  In the fourth embodiment, the valve seat member 6 is not provided with the guide portion 65 as in the first to third embodiments, but the guide portion 65 may of course be provided.

  As mentioned above, although embodiment was described with reference to drawings to this invention, this invention is not limited to this. For example, in the above embodiment, the valve body 32 of the on-off valve 3 is provided with the sub-valve body portion 322 and the bypass hole 32b, but the sub-valve body portion 322 and the bypass hole 32b may be omitted. Moreover, in the said embodiment, although the electromagnetic safety valve 2 and the on-off valve 3 are integrated in the valve casing 1, one of the electromagnetic safety valve 2 and the on-off valve 3 can also be abbreviate | omitted.

DESCRIPTION OF SYMBOLS 1 ... Valve casing, 12 ... Axial direction one side part (one divided | segmented part of valve casing), 13 ... Axial other side part (the other divided | segmented part of valve casing), 2 ... Electromagnetic safety valve, 21 ... Safety valve seat, 22 ... Solenoid valve body, 22a ... Valve shaft, 24 ... Adsorption piece, 25 ... Electromagnet, 3 ... Open / close valve, 31 ... Open / close valve seat, 32 ... Open / close valve valve body, 4 ... Operation rod, 5 ... Electric motor, 6 ... Valve seat member, 61 ... Stopper means, 62 ... Biasing means, 64 ... Annular projection, 65 ... Guide part, 7 ... Belofram, 71 ... Outer peripheral part, 72 ... Inner peripheral part 73 ... Cylinder part, 73a ... Valve seal.

Claims (6)

A gas valve device in which a valve body and a valve seat on which a valve body can be seated are provided in a cylindrical valve casing through which gas flows, and is driven in the axial direction by an electric motor in the valve casing. A valve seat member that moves in the axial direction in conjunction with the operating rod is provided, a valve seat is formed at the axial end of the valve seat member, and an inner peripheral surface of the valve casing and an outer peripheral surface of the valve seat member In which a sealing member is provided for sealing so that gas does not flow in the gap between
The gas valve device according to claim 1, wherein the seal member includes a bellophram having an outer peripheral portion fixed to the valve casing and an inner peripheral portion fixed to the valve seat member.   2. The gas valve device according to claim 1, wherein the valve casing is divided in an axial direction, and an outer peripheral portion of the belofram is sandwiched between one portion and the other portion of the valve casing.   An annular projection that slides on the inner circumferential surface of the valve casing is formed on a portion of the outer circumferential surface of the valve seat member in the axial direction, and an inner portion of the valve casing is separated from the annular projection of the valve seat member. The gas valve device according to claim 1, wherein a guide portion is provided to prevent the valve seat member from inclining in close proximity to the peripheral surface.   The gas valve device according to any one of claims 1 to 3, wherein the bellophram is formed of a rubber molded product that is molded in a state in which an inner peripheral portion thereof is embedded in the valve seat member. .   5. The gas valve device according to claim 4, wherein a cylindrical portion integral with the bellophram is provided that extends in an axial direction from the inner peripheral portion of the bellophram to the inside of the valve seat member and an end portion is exposed to the valve seat. The gas valve device is characterized in that a valve seal that ensures sealing performance when the valve body is seated on the valve seat is constituted by an end of the cylindrical portion exposed to the valve seat. 6. The gas valve device according to claim 5, wherein an electromagnetic safety valve and an on-off valve are incorporated in the valve casing, and the electromagnetic safety valve is a safety valve valve seat formed at one axial end of the valve seat member. A valve body that can be seated, an adsorbing piece that is connected to the valve element via a valve shaft that extends in one axial direction, and an electromagnet that faces the adsorbing piece. A valve body fixed to the operating rod, which can be seated on a valve seat for the on-off valve formed at the end; a biasing means for biasing the valve seat member in the axial direction in the valve casing; Stopper means for stopping movement in the other axial direction at a predetermined position where the valve body of the electromagnetic safety valve can be seated on the valve seat for the safety valve is provided,
The end of the cylinder part integral with the bellophram is exposed to the valve seat for the on-off valve, and the end of this cylinder part opens and closes to ensure sealing performance when the valve body of the on-off valve is seated on the valve seat for the on-off valve A gas valve device comprising a valve seal for a valve.

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