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JP7393194B2 - Electric thermal power control valve - Google Patents

Electric thermal power control valve Download PDF

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Publication number
JP7393194B2
JP7393194B2 JP2019222595A JP2019222595A JP7393194B2 JP 7393194 B2 JP7393194 B2 JP 7393194B2 JP 2019222595 A JP2019222595 A JP 2019222595A JP 2019222595 A JP2019222595 A JP 2019222595A JP 7393194 B2 JP7393194 B2 JP 7393194B2
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valve body
sub
valve
opening direction
valve seat
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JP2021092341A (en
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雅斗 丹下
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Rinnai Corp
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Rinnai Corp
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Priority to JP2019222595A priority Critical patent/JP7393194B2/en
Priority to KR1020200141903A priority patent/KR102710247B1/en
Priority to CN202011215156.3A priority patent/CN112943937B/en
Publication of JP2021092341A publication Critical patent/JP2021092341A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23K—FEEDING FUEL TO COMBUSTION APPARATUS
    • F23K5/00—Feeding or distributing other fuel to combustion apparatus
    • F23K5/002—Gaseous fuel
    • F23K5/007—Details
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
    • F16K1/32—Details
    • F16K1/34—Cutting-off parts, e.g. valve members, seats
    • F16K1/36—Valve members
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
    • F16K1/32—Details
    • F16K1/34—Cutting-off parts, e.g. valve members, seats
    • F16K1/42—Valve seats
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K27/00—Construction of housing; Use of materials therefor
    • F16K27/02—Construction of housing; Use of materials therefor of lift valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
    • F16K31/04—Actuating devices; Operating means; Releasing devices electric; magnetic using a motor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C3/00—Stoves or ranges for gaseous fuels
    • F24C3/12—Arrangement or mounting of control or safety devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23K—FEEDING FUEL TO COMBUSTION APPARATUS
    • F23K2400/00—Pretreatment and supply of gaseous fuel
    • F23K2400/20—Supply line arrangements
    • F23K2400/201—Control devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23K—FEEDING FUEL TO COMBUSTION APPARATUS
    • F23K2900/00—Special features of, or arrangements for fuel supplies
    • F23K2900/05002—Valves for gaseous fuel supply lines

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Electrically Driven Valve-Operating Means (AREA)
  • Feeding And Controlling Fuel (AREA)
  • Lift Valve (AREA)

Description

本発明は、バーナへのガス供給路に介設される電動式火力調節弁に関する。 The present invention relates to an electric thermal power control valve installed in a gas supply path to a burner.

従来、この種の電動式火力調節弁として、特許文献１により、弁筐内の弁室に、弁室の一端の弁座に接近する閉じ方向と弁座から離隔する開き方向とに移動自在に設けられた主弁体と、主弁体に対し開き方向に対向する副弁体と、主弁体を開き方向に付勢する第１付勢手段と、主弁体に対し副弁体を第１付勢手段の付勢力よりも強い付勢力で開き方向に付勢する第２付勢手段と、主弁体に対する副弁体の開き方向への移動を定位置で制止するストッパ手段と、副弁体に開き方向から当接する直動体と、直動体を連動機構を介して開き方向及び閉じ方向に駆動するステッピングモータとを備えるものが知られている。このものおいて、主弁体は、主弁体が弁座に着座した状態でも主弁体の上流側から下流側にガスを流すバイパス孔と、副弁体が着座可能で、バイパス孔が開口する副弁座とを有している。そして、主弁体が弁座に着座すると共に副弁体が副弁座に着座する全閉状態に切換え可能とし、バーナへのガス供給を停止できるようにしている。 Conventionally, as this type of electric thermal power control valve, according to Patent Document 1, a valve chamber in a valve housing is movable in a closing direction approaching a valve seat at one end of the valve chamber and an opening direction away from the valve seat. a main valve body provided, a sub-valve body facing the main valve body in the opening direction, a first biasing means for biasing the main valve body in the opening direction, and a first biasing means for biasing the sub-valve body with respect to the main valve body. a second biasing means for biasing in the opening direction with a biasing force stronger than the biasing force of the first biasing means; a stopper means for stopping movement of the sub-valve body in the opening direction with respect to the main valve body at a fixed position; It is known that the valve includes a linearly moving body that contacts the valve body from the opening direction, and a stepping motor that drives the linearly moving body in the opening direction and the closing direction via an interlocking mechanism. In this device, the main valve body has a bypass hole that allows gas to flow from the upstream side to the downstream side of the main valve body even when the main valve body is seated on the valve seat, and a bypass hole that allows the sub valve body to be seated, and the bypass hole is open. It also has a sub-valve seat. Then, it is possible to switch to a fully closed state in which the main valve element is seated on the valve seat and the auxiliary valve element is seated on the auxiliary valve seat, thereby making it possible to stop the gas supply to the burner.

然し、特許文献１に記載のものでは、副弁座を硬質部材で形成される主弁体の本体部分に形成し、また、副弁体全体を硬質部材で形成している。そのため、全閉状態で副弁体を副弁座に着座させても、硬質部材同士の当接となって、バイパス孔へのガスの流れを完全には遮断できず、全閉状態でのシール不良を生ずる。 However, in the device described in Patent Document 1, the sub-valve seat is formed in the main body portion of the main valve body formed of a hard member, and the sub-valve body as a whole is formed of a hard member. Therefore, even if the sub-valve element is seated on the sub-valve seat in the fully closed state, the hard members will come into contact with each other and the flow of gas to the bypass hole cannot be completely shut off. Causes defects.

特開２０１５－１２９６２６号公報Japanese Patent Application Publication No. 2015-129626

本発明は、以上の点に鑑み、全閉状態でのシール不良を防止できるようにした電動式火力調節弁を提供することをその課題としている。 In view of the above points, it is an object of the present invention to provide an electric thermal power control valve that can prevent seal failure in a fully closed state.

上記課題を解決するために、本発明は、バーナへのガス供給路に介設される電動式火力調節弁であって、弁筐内の弁室に、弁室の一端の弁座に接近する閉じ方向と弁座から離隔する開き方向とに移動自在に設けられた主弁体と、主弁体に対し開き方向に対向する副弁体と、主弁体を開き方向に付勢する第１付勢手段と、主弁体に対し副弁体を第１付勢手段の付勢力よりも強い付勢力で開き方向に付勢する第２付勢手段と、主弁体に対する副弁体の開き方向への移動を定位置で制止するストッパ手段と、副弁体に開き方向から当接する直動体と、直動体を連動機構を介して開き方向及び閉じ方向に駆動するステッピングモータとを備え、主弁体は、主弁体が弁座に着座した状態でも主弁体の上流側から下流側にガスを流すバイパス孔と、副弁体が着座可能で、バイパス孔が開口する副弁座とを有し、主弁体が弁座に着座すると共に副弁体が副弁座に着座する全閉状態に切換え可能としたものにおいて、副弁体に、副弁座に対向する弾性材料製のパッキンが取付けられ、副弁体がパッキンにおいて副弁座に着座するようにし、副弁体は、硬質材料で形成される弁本体を備え、弁本体は、副弁座に対向する弁本体の先端に開口する中空部を有し、パッキンは、この中空部に、パッキンの副弁座に対向する先端部が弁本体の先端から所定の圧縮代分だけ突出するように装着され、全閉状態でステッピングモータを脱調させて原点出しを行う際に、パッキンが前記所定の圧縮代分だけ圧縮されて弁本体の先端が副弁座に当接するようにしたことを特徴とする。 In order to solve the above problems, the present invention provides an electric thermal power control valve installed in a gas supply path to a burner, in which a valve chamber in a valve casing approaches a valve seat at one end of the valve chamber. A main valve element that is movable in the closing direction and an opening direction away from the valve seat, a sub-valve element that faces the main valve element in the opening direction, and a first valve element that biases the main valve element in the opening direction. a biasing means; a second biasing means for biasing the sub-valve body relative to the main valve body in the opening direction with a biasing force stronger than the biasing force of the first biasing means; and opening of the sub-valve body relative to the main valve body. The main valve includes a stopper means for stopping the movement in the direction at a fixed position, a linear moving body that contacts the sub-valve body from the opening direction, and a stepping motor that drives the linear moving body in the opening direction and the closing direction via an interlocking mechanism. The valve body has a bypass hole that allows gas to flow from the upstream side to the downstream side of the main valve body even when the main valve body is seated on the valve seat, and a sub-valve seat in which the sub-valve body can be seated and the bypass hole opens. and is capable of switching to a fully closed state in which the main valve body is seated on the valve seat and the sub-valve body is seated on the sub-valve seat, and the sub-valve body has a packing made of an elastic material facing the sub-valve seat. is attached so that the sub-valve body is seated on the sub-valve seat in the packing , and the sub-valve body includes a valve body formed of a hard material, and the valve body is provided with a valve body at the tip of the valve body opposite to the sub-valve seat. The packing has a hollow part that opens, and the packing is installed in this hollow part so that the tip of the packing facing the sub-valve seat protrudes from the tip of the valve body by a predetermined compression amount, and the packing is stepped in the fully closed state. The present invention is characterized in that when the motor is caused to step out and the origin search is performed, the packing is compressed by the predetermined compression amount so that the tip of the valve body comes into contact with the auxiliary valve seat.

本発明の電動式火力調節弁によれば、全閉状態で、主弁体に設けられた副弁座に副弁体に設けられた弾性材料製のパッキンが着座するため、硬質部材同士が当接する上記従来例と異なり、全閉状態でのシール不良を確実に防止することができる。 According to the electric thermal power control valve of the present invention, in the fully closed state, the packing made of an elastic material provided on the auxiliary valve element seats on the auxiliary valve seat provided on the main valve element, so that the hard members touch each other. Unlike the conventional example mentioned above, it is possible to reliably prevent seal failure in the fully closed state.

ところで、ステッピングモータの原点出しを行う際は、全閉状態でステッピングモータを脱調させるが、全閉状態で副弁体をパッキンにおいて副弁座に着座させたのでは、脱調時のパッキンの圧縮具合のバラツキにより、ステッピングモータの原点位置が一義的に定まらなくなってしまうことがある。 By the way, when performing the home search of the stepping motor, the stepping motor is caused to step out in the fully closed state , but if the sub-valve element is seated on the sub-valve seat with the packing in the fully closed state, the packing will be damaged when the stepping motor loses synchronization. Due to variations in the degree of compression, the origin position of the stepping motor may not be uniquely determined.

一方、本発明によれば、全閉状態でステッピングモータを脱調させて原点出しを行う際に、上記の如く弁本体の先端が副弁座に当接するため、パッキンの圧縮具合のバラツキの影響を受けずに、ステッピングモータの原点位置を一義的に定めることができ、この原点位置に基づいて正確に火力調節を行うことができる。 On the other hand , according to the present invention, when the stepping motor is out of step in the fully closed state to find the origin, the tip of the valve body comes into contact with the sub-valve seat as described above , so the influence of variations in the degree of compression of the packing It is possible to uniquely determine the origin position of the stepping motor without being affected by this, and it is possible to accurately adjust the thermal power based on this origin position.

本発明の実施形態の電動式火力調節弁の切断側面図。FIG. 1 is a cutaway side view of an electric thermal power control valve according to an embodiment of the present invention. 実施形態の電動式火力調節弁の要部の分解状態の斜視図。FIG. 2 is an exploded perspective view of the main parts of the electric thermal power control valve according to the embodiment.

図１を参照して、Ａは、コンロバーナ等のバーナＢへのガス供給路Ｇに介設する本発明の実施形態の電動式火力調節弁である。この火力調節弁Ａは、ガス供給路Ｇの上流側部分と下流側部分とを夫々接続する流入口１１と流出口１２とを有する弁筐１を備えている。弁筐１内には、流入口１１に連通する弁室１３と、弁室１３の一端の弁座１４とが設けられ、弁座１４に、流出口１２に連通する弁孔１５が開設されている。 Referring to FIG. 1, A is an electric thermal power control valve according to an embodiment of the present invention, which is interposed in a gas supply path G to a burner B such as a stove burner. The thermal power control valve A includes a valve housing 1 having an inlet 11 and an outlet 12 that connect the upstream and downstream parts of the gas supply path G, respectively. A valve chamber 13 communicating with the inlet 11 and a valve seat 14 at one end of the valve chamber 13 are provided in the valve housing 1, and a valve hole 15 communicating with the outlet 12 is provided in the valve seat 14. There is.

図２も参照して、電動式火力調節弁Ａは、弁室１３に、弁座１４に接近する閉じ方向（図１の右方）と弁座１４から離隔する開き方向（図１の左方）とに移動自在に設けられた主弁体２と、主弁体２に対し開き方向に対向する副弁体３と、主弁体２を開き方向に付勢する第１付勢手段４１と、主弁体２に対し副弁体３を第１付勢手段４１よりも強い付勢力で開き方向に付勢する第２付勢手段４２と、主弁体２に対する副弁体３の開き方向への移動を定位置で制止するストッパ手段５と、副弁体３に開き方向から当接する直動体６と、直動体６を連動機構７を介して開き方向及び閉じ方向に駆動するステッピングモータ８とを備えている。 Referring also to FIG. 2, the electric thermal power control valve A has two directions in the valve chamber 13: a closing direction approaching the valve seat 14 (right side in FIG. 1) and an opening direction moving away from the valve seat 14 (left side in FIG. 1). ), a main valve body 2 movably provided, a sub-valve body 3 facing the main valve body 2 in the opening direction, and a first biasing means 4 for biasing the main valve body 2 in the opening direction. , a second biasing means 42 that biases the sub-valve body 3 against the main valve body 2 in the opening direction with a stronger biasing force than the first biasing means 41 , and a second biasing means 42 that biases the sub-valve body 3 against the main valve body 2 a stopper means 5 that stops movement in the opening direction at a fixed position, a linear motion body 6 that contacts the sub-valve body 3 from the opening direction, and a linear motion body 6 that is driven in the opening direction and the closing direction via an interlocking mechanism 7. It is equipped with a stepping motor 8.

主弁体２は、硬質樹脂等の硬質材料で形成される弁本体２１を備えている。この弁本体２１には、弁孔１５に挿入可能なニードル部２２が設けられている。また、弁本体２１には、ニードル部２２の開き方向の端部に形成した鍔部２２ａにより抜け止めされる、弁座１４に着座可能な、ゴム等の弾性材料で形成された環状の閉塞部２３が外嵌固定されている。更に、弁本体２１には、主弁体２、即ち、閉塞部２３が弁座１４に着座した状態でも主弁体２の上流側から下流側にガスを流すバイパス孔２４と、副弁体３が着座可能で、バイパス孔２４が開口する副弁座２５とが形成されている。バイパス孔２４には、バーナの最小火力を規定するオリフィス部２４ａが設けられている。また、弁本体２１の開き方向の端部には、副弁体３を囲うようにして開き方向にのびる、硬質材料から成るガイド筒部２６が結合されている。ガイド筒部２６の外周面には、弁室１３の周壁面に摺接する複数の突条２６ａが突設され、また、ガイド筒部２６の基端部には、ガイド筒部２６の内外を連通する透孔２６ｂが形成されている。 The main valve body 2 includes a valve body 21 made of a hard material such as hard resin. This valve body 21 is provided with a needle portion 22 that can be inserted into the valve hole 15. The valve body 21 also has an annular closing part made of an elastic material such as rubber, which can be seated on the valve seat 14 and is prevented from coming off by a flange 22a formed at the end in the opening direction of the needle part 22. 23 is externally fitted and fixed. Further, the valve body 21 has a bypass hole 24 that allows gas to flow from the upstream side to the downstream side of the main valve body 2 even when the main valve body 2, that is, the blocking portion 23 is seated on the valve seat 14, and a sub valve body 3. A sub-valve seat 25 on which a bypass hole 24 opens is formed. The bypass hole 24 is provided with an orifice portion 24a that defines the minimum thermal power of the burner. Further, a guide cylinder portion 26 made of a hard material and extending in the opening direction so as to surround the sub-valve body 3 is coupled to the end of the valve body 21 in the opening direction. A plurality of protrusions 26a are provided on the outer circumferential surface of the guide cylinder part 26 to make sliding contact with the peripheral wall surface of the valve chamber 13, and a protrusion 26a is provided at the base end of the guide cylinder part 26 to communicate the inside and outside of the guide cylinder part 26. A through hole 26b is formed.

副弁体３には、副弁座２５に対向するゴム等の弾性材料製のパッキン３２が取付けられている。そして、副弁体３がパッキン３２において副弁座２５に着座するようにしている。より具体的に説明すれば、副弁体３は、硬質樹脂等の硬質材料で形成される弁本体３１を備えている。この弁本体３１は、副弁座２５に対向する弁本体３１の先端に開口する中空部３１ａを有している。上記パッキン３２は、この中空部３１ａに装着されている。図２に明示されているように、自由状態において、パッキン３２の副弁座２５に対向する先端部３２ａは、弁本体３１の副弁座２５に対向する先端から所定の圧縮代分だけ突出している。尚、本実施形態では、パッキン３２を、弁本体３１の成形時のインサート成形で、中空部３１ａに装着しているが、弁本体３１の成形後に、パッキン３２を中空部３１ａに嵌め込むようにして装着することも可能である。尚、この場合、弁本体３１とパッキン３２とを両者間に接着剤を塗布して接合してもよい。また、副弁体３には、弁本体３１と一体に、主弁体２のガイド筒部２６の内周面に摺接するガイド部３３が設けられている。 A packing 32 made of an elastic material such as rubber is attached to the sub-valve body 3 and faces the sub-valve seat 25 . The sub-valve body 3 is seated on the sub-valve seat 25 in the packing 32. More specifically, the sub-valve body 3 includes a valve body 31 made of a hard material such as hard resin. This valve body 31 has a hollow portion 31 a that opens at the tip of the valve body 31 facing the sub-valve seat 25 . The packing 32 is attached to this hollow portion 31a. As clearly shown in FIG. 2, in the free state, the tip 32a of the packing 32 facing the auxiliary valve seat 25 protrudes from the tip of the valve body 31 facing the auxiliary valve seat 25 by a predetermined compression amount. There is. In this embodiment, the packing 32 is attached to the hollow portion 31a by insert molding when the valve body 31 is molded, but the packing 32 may be fitted into the hollow portion 31a after the valve body 31 is molded. It is also possible to do so. In this case, the valve body 31 and the packing 32 may be joined by applying an adhesive therebetween. Further, the sub-valve body 3 is provided with a guide portion 33 integrally with the valve body 31 and slidably in contact with the inner circumferential surface of the guide cylinder portion 26 of the main valve body 2 .

ストッパ手段５は、主弁体２のガイド筒部２６に形成した窓孔５１と、副弁体３の外周面に突設した、窓孔５１に遊びを持って挿入される爪部５２とで構成されている。そして、副弁体３が主弁体２に対し開き方向に移動して、窓孔５１の開き方向の端縁に爪部５２が係合したところで、副弁体３が主弁体２に対しそれ以上開き方向に移動しないようにしている。 The stopper means 5 includes a window hole 51 formed in the guide cylinder portion 26 of the main valve body 2 and a claw portion 52 protruding from the outer peripheral surface of the sub-valve body 3 and inserted into the window hole 51 with some play. It is configured. Then, when the sub-valve body 3 moves in the opening direction relative to the main valve body 2 and the claw portion 52 engages with the edge of the window hole 51 in the opening direction, the sub-valve body 3 moves relative to the main valve body 2. It is prevented from moving further in the opening direction.

直動体６は、閉じ方向の端面が球面状の凸面に形成されており、この凸面を、副弁体３の開き方向の端面に当接させている。連動機構７は、ステッピングモータ８の出力軸８１に連結される雄ねじ７１と、雄ねじ７１が螺合する、回り止めされた摺動子７２とから成る送りねじ機構で構成されている。摺動子７２は、連動機構７の配置部を弁室１３に対し仕切るダイヤフラム６１に当接しており、このダイヤフラム６１に直動体６を連結している。 The end surface of the linear motion body 6 in the closing direction is formed into a spherical convex surface, and this convex surface is brought into contact with the end surface of the sub-valve body 3 in the opening direction. The interlocking mechanism 7 is constituted by a feed screw mechanism including a male screw 71 connected to the output shaft 81 of the stepping motor 8 and a rotationally prevented slider 72 into which the male screw 71 is screwed. The slider 72 is in contact with a diaphragm 61 that partitions the arrangement part of the interlocking mechanism 7 from the valve chamber 13, and connects the linear motion body 6 to this diaphragm 61.

図１に示す如く、主弁体２（正確には、主弁体２の閉塞部２３）が弁座１４に着座すると共に、副弁体３が主弁体２の副弁座２５に着座してバイパス孔２４を閉塞する状態が、電動式火力調節弁Ａの全閉状態であって、バーナＢへのガス供給が停止される。この全閉状態からステッピングモータ８により連動機構７を介して直動体６を開き方向に移動させると、副弁体３が第２付勢手段４２の付勢力により直動体６に追従して開き方向に移動する。主弁体２に対する副弁体３の開き方向への移動がストッパ手段５で制止されるまでは、主弁体２の開き方向への移動が第２付勢手段４２の付勢力によって阻止されて、主弁体２が弁座１４に着座した状態に維持されると共に、副弁体３が副弁座２５から離隔して、バイパス孔２４が開放され、電動式火力調節弁Ａは、バーナＢの火力を最小にする最小火力状態になる。主弁体２に対する副弁体３の開き方向への移動がストッパ手段５で制止された後、副弁体３を更に開き方向に移動させれば、主弁体２が第１付勢手段４１の付勢力により副弁体３に追従して開き方向に移動し、主弁体２が弁座１４から離隔して、バーナＢの火力が次第に増加する。 As shown in FIG. 1, the main valve body 2 (more precisely, the blocking part 23 of the main valve body 2) is seated on the valve seat 14, and the sub-valve body 3 is seated on the sub-valve seat 25 of the main valve body 2. The state in which the bypass hole 24 is closed is the fully closed state of the electric thermal power control valve A, and the gas supply to the burner B is stopped. When the stepping motor 8 moves the linear moving body 6 in the opening direction via the interlocking mechanism 7 from this fully closed state, the auxiliary valve body 3 follows the linear moving body 6 and opens due to the urging force of the second urging means 42. move in the direction. Until the movement of the sub-valve element 3 in the opening direction relative to the main valve element 2 is stopped by the stopper means 5, the movement of the main valve element 2 in the opening direction is prevented by the urging force of the second urging means 42 . As a result, the main valve body 2 is maintained seated on the valve seat 14, the sub valve body 3 is separated from the sub valve seat 25, the bypass hole 24 is opened, and the electric thermal power control valve A is closed to the burner. Becomes the minimum firepower state that minimizes B's firepower. After the movement of the auxiliary valve element 3 in the opening direction with respect to the main valve element 2 is stopped by the stopper means 5, if the auxiliary valve element 3 is further moved in the opening direction, the main valve element 2 is moved to the first urging means 4. 1 moves in the opening direction following the sub-valve body 3, the main valve body 2 separates from the valve seat 14, and the thermal power of the burner B gradually increases.

ここで、本実施形態の電動式火力調節弁Ａでは、全閉状態としたときに、副弁体３がパッキン３２において副弁座２５に着座する。そのため、主弁体２の硬質材料で形成される副弁座２５に副弁体３の硬質材料で形成される部分が当接する上記従来例と異なり、全閉状態でのシール不良を確実に防止することができる。 Here, in the electric thermal power control valve A of this embodiment, the sub-valve body 3 is seated on the sub-valve seat 25 in the packing 32 when the valve is in a fully closed state. Therefore, unlike the above-mentioned conventional example in which the portion of the sub-valve body 3 made of a hard material comes into contact with the sub-valve seat 25 of the main valve body 2 made of a hard material, seal failure in the fully closed state is reliably prevented. can do.

また、定期的に、全閉状態でステッピングモータ８を脱調させて原点出しを行うが、本実施形態では、原点出しに際し、副弁体３のパッキン３２が上記所定の圧縮代分だけ圧縮されて、図１に示す如く、副弁体３の弁本体３１の先端が副弁座２５に当接するようにしている。これによれば、パッキン３２の圧縮具合のバラツキの影響を受けずに、ステッピングモータ８の原点位置を一義的に定めることができる。従って、この原点位置に基づいて正確に火力調節を行うことができる。尚、原点出しに際しては、主弁体２の閉塞部２３も圧縮させて、鍔部２２ａを弁座１４に当接させる。 In addition, the stepping motor 8 is periodically stepped out in the fully closed state to return to the home position. In this embodiment, when returning to the home position, the packing 32 of the sub-valve body 3 is compressed by the predetermined compression amount. As shown in FIG. 1, the tip of the valve body 31 of the sub-valve body 3 is brought into contact with the sub-valve seat 25. According to this, the origin position of the stepping motor 8 can be uniquely determined without being affected by variations in the degree of compression of the packing 32. Therefore, the firepower can be adjusted accurately based on this origin position. In addition, when returning to the origin, the closing portion 23 of the main valve body 2 is also compressed to bring the flange portion 22a into contact with the valve seat 14.

以上、本発明の実施形態について図面を参照して説明したが、本発明はこれに限定されない。例えば、上記実施形態では、連動機構７を送りねじ機構で構成しているが、ラックピニオン機構やカム機構等の送りねじ機構以外のもので構成してもよい。 Although the embodiments of the present invention have been described above with reference to the drawings, the present invention is not limited thereto. For example, in the above embodiment, the interlocking mechanism 7 is configured by a feed screw mechanism, but it may be configured by something other than the feed screw mechanism, such as a rack and pinion mechanism or a cam mechanism.

Ａ…電動式火力調節弁、Ｂ…バーナ、Ｇ…ガス供給路、１…弁筐、１３…弁室、１４…弁座、２…主弁体、２５…副弁座、３…副弁体、３１…弁本体、３１ａ…中空部、３２…パッキン、３２ａ…パッキンの先端部、４１…第１付勢手段、４２…第２付勢手段、５…ストッパ手段、６…直動体、７…連動機構、８…ステッピングモータ。 A...Electric thermal power control valve, B...Burner, G...Gas supply path, 1...Valve housing, 13...Valve chamber, 14...Valve seat, 2...Main valve body, 25 ...Sub-valve seat, 3...Sub-valve body , 31... Valve body, 31a... Hollow part, 32... Packing, 32a... Packing tip, 41... First urging means, 42... Second urging means, 5... Stopper means, 6... Linear moving body, 7... Interlocking mechanism, 8...stepping motor.

Claims (1)

バーナへのガス供給路に介設される電動式火力調節弁であって、弁筐内の弁室に、弁室の一端の弁座に接近する閉じ方向と弁座から離隔する開き方向とに移動自在に設けられた主弁体と、主弁体に対し開き方向に対向する副弁体と、主弁体を開き方向に付勢する第１付勢手段と、主弁体に対し副弁体を第１付勢手段の付勢力よりも強い付勢力で開き方向に付勢する第２付勢手段と、主弁体に対する副弁体の開き方向への移動を定位置で制止するストッパ手段と、副弁体に開き方向から当接する直動体と、直動体を連動機構を介して開き方向及び閉じ方向に駆動するステッピングモータとを備え、主弁体は、主弁体が弁座に着座した状態でも主弁体の上流側から下流側にガスを流すバイパス孔と、副弁体が着座可能で、バイパス孔が開口する副弁座とを有し、主弁体が弁座に着座すると共に副弁体が副弁座に着座する全閉状態に切換え可能としたものにおいて、
副弁体に、副弁座に対向する弾性材料製のパッキンが取付けられ、副弁体がパッキンにおいて副弁座に着座するようにし、
副弁体は、硬質材料で形成される弁本体を備え、弁本体は、副弁座に対向する弁本体の先端に開口する中空部を有し、パッキンは、この中空部に、パッキンの副弁座に対向する先端部が弁本体の先端から所定の圧縮代分だけ突出するように装着され、全閉状態でステッピングモータを脱調させて原点出しを行う際に、パッキンが前記所定の圧縮代分だけ圧縮されて弁本体の先端が副弁座に当接するようにしたことを特徴とする電動式火力調節弁。 This electric thermal power control valve is installed in a gas supply path to a burner, and has a valve chamber in a valve casing with two directions: a closing direction approaching a valve seat at one end of the valve chamber, and an opening direction moving away from the valve seat. A movable main valve body, a sub valve body facing the main valve body in the opening direction, a first biasing means for biasing the main valve body in the opening direction, and a sub valve body facing the main valve body in the opening direction. a second biasing means for biasing the body in the opening direction with a biasing force stronger than the biasing force of the first biasing means; and a stopper means for stopping movement of the sub-valve body in the opening direction with respect to the main valve body at a fixed position. , a linear motion body that contacts the sub-valve body from the opening direction, and a stepping motor that drives the linear motion body in the opening direction and the closing direction via an interlocking mechanism, and the main valve body is configured such that the main valve body is seated on the valve seat. It has a bypass hole that allows gas to flow from the upstream side to the downstream side of the main valve body even in a state where the main valve body is seated, and a sub-valve seat in which the sub-valve body can be seated and the bypass hole opens, and the main valve body is seated on the valve seat. In a device that can be switched to a fully closed state in which the sub-valve element is seated on the sub-valve seat,
A packing made of an elastic material facing the sub-valve seat is attached to the sub-valve body, and the sub-valve body is seated on the sub-valve seat in the packing ,
The sub-valve body includes a valve body made of a hard material, the valve body has a hollow portion that opens at the tip of the valve body that faces the sub-valve seat, and the packing has a sub-valve portion of the packing in this hollow portion. The tip facing the valve seat is installed so that it protrudes from the tip of the valve body by a predetermined amount of compression. An electrically operated thermal power control valve characterized in that the tip of the valve body is compressed by the amount corresponding to that amount and the tip of the valve body comes into contact with a sub-valve seat .
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