JP2004169826A

JP2004169826A - Poppet type solenoid valve

Info

Publication number: JP2004169826A
Application number: JP2002336932A
Authority: JP
Inventors: Fumiaki Kato; 史章加藤
Original assignee: Denso Corp
Current assignee: Denso Corp
Priority date: 2002-11-20
Filing date: 2002-11-20
Publication date: 2004-06-17

Abstract

<P>PROBLEM TO BE SOLVED: To provide a poppet type solenoid valve capable of preventing runout of a valve stem and a poppet valve caused by vibrations, and enhancing the sealability when the valve is closed. <P>SOLUTION: A valve stem 3 is protruded from an electromagnetic drive unit 2 into a valve chest 4 in a housing 1, a poppet valve 5 is fixed to the valve stem 3, and the valve stem 3 and the poppet valve 5 are moved in the axial direction by the drive of the electromagnetic drive unit 2 to open/close the poppet type solenoid valve. A guide member 10 to guide the movement of the valve stem 3 and the poppet valve 5 is fitted to the valve stem 3 on the counter-electromagnetic drive unit side opposed to the poppet valve 5. The guide member 10 comprises an annular frame part 11 and a cruciform frame part 12, and is slidably disposed on an inner wall of an cylindrical portion 6a in the valve chest 4. <P>COPYRIGHT: (C)2004,JPO

Description

【０００１】
【発明の属する技術分野】
本発明は、自動車の冷却水管路などの開閉に使用されるポペット弁を備えたポペット式電磁弁に関し、特にポペット弁の振れを防止するポペット式電磁弁に関する。
【０００２】
【従来の技術】
例えば、自動車の内燃機関の冷却水管路に配設される電磁弁として、ポペット式電磁弁が使用されている。この種のポペット式電磁弁は、弁軸の先端にポペット弁（弁体）が固定され、弁軸の末端部が電磁ソレノイドのプランジャに連結され、作動時にはプランジャの軸方向への移動によって、弁軸がその軸方向に移動し、ポペット弁が弁座の内側の弁孔を開閉する構造である（例えば下記特許文献１を参照）。
【０００３】
【特許文献１】
特開平６−２７２７８４号公報
【０００４】
【発明が解決しようとする課題】
しかしながら、この種のポペット式電磁弁は、ポペット弁が片持ち構造の弁軸の先端に固定されているため、振動が発生すると、弁軸の先端部のポペット弁が振れて傾斜しやすく、作動時に弁軸と共にポペット弁が傾斜すると、閉弁時には弁座との間に隙間が生じやすく、閉弁時のシール性が悪化するなどの問題があった。
【０００５】
本発明は、上述の課題を解決するものであり、振動などによる弁軸とポペット弁の振れを防止し、閉弁時のシール性を向上させることができるポペット式電磁弁を提供することを目的とする。
【０００６】
【課題を解決するための手段】
上記目的を達成するために、本発明のポペット式電磁弁は、ハウジング内の弁室に電磁駆動部から弁軸が突設され、弁軸にポペット弁が固定され、電磁駆動部の駆動により弁軸及びポペット弁が軸方向に移動して開閉動作するポペット式電磁弁において、弁軸及びポペット弁の移動をガイドするガイド部材が、ポペット弁に対し反電磁駆動部側の弁軸に取り付けられたことを特徴とする。
【０００７】
ここで、上記ポペット式電磁弁においては、請求項２のように、ガイド部材を環状枠部と十字枠部とから構成し、弁室内の円筒部の内壁に摺動可能に配設することができる。
【０００８】
また、請求項３のように、ガイド部材の環状枠部の外周に外周突出部を突設し、外周突出部の先端に半円柱形の凸状曲面部を形成することができる。
【０００９】
また、請求項４のように、ガイド部材の環状枠部の外周に外周突出部を突設し、外周突出部の先端に半球形の凸状曲面部を形成することができる。
【００１０】
【作用】
上記構成のポペット式電磁弁では、電磁駆動部の作動により弁軸及びポペット弁が軸方向に移動して、弁室に設けた弁座に着座し、或いは弁座から離れて開弁閉弁が行われる。この開弁閉弁の作動時、弁軸及びポペット弁は、その軸方向の動きが、そのポペット弁の反電磁駆動部側に突出した弁軸の先端部に取り付けたガイド部材によりガイドされるため、つまり、例えばガイド部材の環状枠部の外周突出部が弁室内の円筒部の内壁に摺動して、その軸方向の動きがガイドされるため、作動時の振動などによる弁軸及びポペット弁の振れを防止することができる。
【００１１】
従って、弁軸の振れによるポペット弁の傾斜を防止して、閉弁時には適正な状態でポペット弁が弁座に着座するようにし、閉弁時のシール性を向上させることができる。また、ガイド部材は、環状枠部と十字枠部とから構成し、環状枠部の外周に外周突出部を突設し、その外周突出部の先端に半円柱形の凸状曲面或いは半球形の凸状曲面を形成し、その凸状曲面を線接触または点接触で弁室内の円筒部の内壁に摺動させるようにすれば、ガイド部材の摩擦抵抗が少なくなり、また、間に異物を噛み込んでロックするなどの不具合も防止することができる。
【００１２】
【発明の実施の形態】
以下、本発明の一実施形態を図面に基づいて説明する。図１はポペット式電磁弁の概略断面図を示している。１は電磁弁のハウジングであり、ハウジング１内の上部に電磁駆動部２が収納される。電磁駆動部２には図示しない電磁ソレノイドが配設され、電磁ソレノイド内にはプランジャが軸方向に移動可能に配設される。
【００１３】
電磁駆動部２内のプランジャの下端に弁軸３が連結固定され、弁軸３は、ハウジング１内に設けた弁室４に上下動可能に配設され、弁軸３の先端付近にキノコ形のポペット弁（弁体）５が固定される。弁室４は上室と下室とからなり、上室と下室の中間部に円錐状の狭窄された部分が形成され、そこに弁座６が設けられる。また、下室の側部に入口ポート８が設けられ、上室の側部に出口ポート９が設けられる。
【００１４】
弁座６は凹状の円錐形テーパ面をもって形成され、ポペット弁５の下部に、その円錐形テーパ面と嵌合可能な凸状の円錐形テーパ部が形成され、ポペット弁５は下降によって弁座６に着座し閉弁する構造である。
【００１５】
弁軸３の先端はポペット弁５を貫通して突出し、その突出した弁軸３の先端部に、図２、図３に示すようなガイド部材１０がポペット弁５の上下動をガイドするために取り付けられている。すなわち、弁座６の下側に円筒部６ａが形成され、ガイド部材１０はその円筒部６ａの内周壁に上下摺動可能に挿通されている。
【００１６】
ガイド部材１０は、図２，図３のように、十字状の十字枠部１２の外周部に環状枠部１１を接続して形成され、環状枠部１１の外側には十字枠部１２の先端を外周に突出する形態で、外周突出部１３が９０度間隔で４箇所に形成されている。この外周突出部１３の先端には、半円柱の凸状曲面部１３ａが形成され、円筒部６ａの内周壁との接触部分が略線接触となるようにしている。図２に示すように、ポペット弁５の下に突出した弁軸３の先端が、ガイド部材１０の十字枠部１２の中心部に固定されてガイド部材１０は装着され、弁室４内では、弁座６の円筒部６ａに摺動可能に挿入される。
【００１７】
このように構成されたポペット式電磁弁は、例えば自動車の内燃機関の冷却水管路に接続して、冷却水管路の遮断弁として使用され、その入口ポート８と出口ポート９がその管路に接続される。電磁駆動部２は図示しないドライバ回路に接続され、ドライバ回路の駆動制御によりポペット式電磁弁は開閉動作を行う。
【００１８】
例えば、図１のような開弁状態で電磁駆動部２が閉弁制御された場合、電磁駆動部２の電磁ソレノイドはその内部のプランジャを押し出すように作用し、これにより弁軸３が図４のように下降し、ポペット弁５が下降して弁座６に着座し、閉弁状態となる。このとき、ポペット弁５の下降と共に、弁座６の下の円筒部６ａに挿通されているガイド部材１０がその外周突出部１３を円筒部６ａの内周面に摺動させながら下降し、ポペット弁５の下降をガイドするように作用する。
【００１９】
したがって、ポペット弁５の弁軸３が片持ち構造であっても、弁軸３及びポペット弁５の振れを防止して、閉弁時にはポペット弁５を弁座６に適正に着座させて、流体の漏れをなくし、閉弁時のシール性を向上させることができる。
【００２０】
一方、図４のような閉弁状態で、電磁駆動部２が開弁制御された場合、電磁駆動部２の電磁ソレノイドはその内部のプランジャを引き戻すように作用し、これにより弁軸３が図１のように上昇し、ポペット弁５が上昇して、開弁状態となる。このときも、ポペット弁５の上昇と共に、弁座６の下の円筒部６ａに挿通されているガイド部材１０がその外周突出部１３を円筒部６ａの内周面に摺動させながら上昇し、ポペット弁５の上昇をガイドするように作用する。したがって、ポペット弁５の弁軸３が片持ち構造であっても、弁軸３及びポペット弁５の振れを防止することができる。
【００２１】
このように、本ポペット式電磁弁では、ガイド部材１０によって、弁軸３及びポペット弁５の振れや傾きを防止するが、ガイド部材１０がポペット弁５の先端側に装着されているから、つまりポペット弁５に対して電磁駆動部２側と反対側にガイド部材１０が設けられているため、より効果的に弁軸３及びポペット弁５の振れや傾きを防止することができる。
【００２２】
すなわち、図５は、ガイド部材をポペット弁の電磁駆動部側とポペット弁の先端側に設けた場合の弁軸３及びポペット弁５の振れを示したものである。この図５から、ガイド部材をポペット弁５より電磁駆動部側に設けた場合、ガイド部材の振れをｆとした場合、ポペット弁５の振れは１．５ｆとなるが、ガイド部材をポペット弁５の先端側つまり反電磁駆動部側に設けた場合、ガイド部材の振れをｆとすると、ポペット弁５の振れは（３／４）ｆと少なくなることがわかる。
【００２３】
なお、上記では、ガイド部材１０の外周突出部１３の先端に半円柱の曲面部１３ａを形成したが、その外周突出部１３の先端を半球状とし、半球状の凸状曲面部を形成してもよく、この場合には円筒部６ａとの接触を点接触にして摺動抵抗を少なくすることができる。
【００２４】
図６、図７は他の実施形態のポペット式電磁弁を示している。この例のポペット式電磁弁は、ガイド部材２０が弁座６の下部の円筒部６ａに固定されている。その他の構成は上記実施形態と同様であり、同じ部分については図に上記と同じ符号を付してその説明を省略する。
【００２５】
このガイド部材２０は、弁座６の下部の円筒部６ａに固定され、その中央には弁軸２３が挿通される貫通孔２０ａが穿設されている。弁軸２３は、ポペット弁５を固定した部分より下側が長く下方に突出して形成され、その下に突出した弁軸２３の下端部が、図６のようにその中央部の貫通孔２０ａに摺動可能に挿通されている。ガイド部材２０は、円筒部６ａに固定されるため、上記のように補強用の環状枠部１１はなくてもよく、単純に十字枠部のみ、或いは水平枠のみで構成することもできる。
【００２６】
このような構成のポペット式電磁弁は、例えば、図６のような開弁状態で電磁駆動部２が閉弁制御された場合、電磁駆動部２の電磁ソレノイドはその内部のプランジャを押し出すように作用し、これにより弁軸２３が図７のように下降し、ポペット弁５が下降して弁座６に着座し、閉弁状態となる。このとき、ポペット弁５の下側の弁軸２３は、円筒部６ａに固定されたガイド部材２０の貫通孔２０ａに挿通されているから、このガイド部材２０に弁軸２３はガイドされて下降する。
【００２７】
したがって、弁軸３及びポペット弁５が下降する際の振れを防止して、閉弁時にはポペット弁５を弁座６に適正に着座させて、流体の漏れをなくし、閉弁時のシール性を向上させることができる。
【００２８】
一方、図７のような閉弁状態で、電磁駆動部２が開弁制御された場合、電磁駆動部２の電磁ソレノイドはその内部のプランジャを引き戻すように作用し、これにより弁軸２３が図６のように上昇し、ポペット弁５が上昇して、開弁状態となる。このときの弁軸２３の先端部も、ガイド部材２０の貫通孔２０ａにガイドされて上昇するため、弁軸２３及びポペット弁５の振れを防止することができる。
【００２９】
【発明の効果】
以上説明したように、本発明のポペット式電磁弁によれば、開弁閉弁の作動時、弁軸及びポペット弁は、その軸方向の動きが、そのポペット弁の反電磁駆動部側に取り付けたガイド部材によりガイドされるため、作動時の振動などによる弁軸及びポペット弁の振れを防止することができる。従って、弁軸の振れによるポペット弁の傾斜を防止して、閉弁時には適正な状態でポペット弁が弁座に着座するようにし、閉弁時のシール性を向上させることができる。
【図面の簡単な説明】
【図１】本発明の一実施形態を示すポペット式電磁弁の概略断面図である。
【図２】ポペット弁とガイド部材の拡大斜視図である。
【図３】ガイド部材の底面図である。
【図４】閉弁時のポペット式電磁弁の概略断面図である。
【図５】ガイド部材をポペット弁の駆動部側に設けた場合と反駆動部側に設けた場合のポペット弁の振れを示す説明図である。
【図６】他の実施形態の開弁時のポペット式電磁弁の概略断面図である。
【図７】閉弁時の同ポペット式電磁弁の概略断面図である。
【符号の説明】
１‐ハウジング
２‐電磁駆動部
３‐弁軸
４‐弁室
５‐ポペット弁
６‐弁座
１０‐ガイド部材[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a poppet-type solenoid valve having a poppet valve used for opening and closing a cooling water pipe of an automobile, and more particularly to a poppet-type solenoid valve for preventing the poppet valve from swinging.
[0002]
[Prior art]
For example, a poppet-type solenoid valve is used as a solenoid valve disposed in a cooling water pipe of an internal combustion engine of an automobile. In this type of poppet type solenoid valve, a poppet valve (valve element) is fixed to the tip of a valve shaft, and the end of the valve shaft is connected to a plunger of an electromagnetic solenoid. The structure is such that a shaft moves in the axial direction, and a poppet valve opens and closes a valve hole inside a valve seat (for example, see Patent Document 1 below).
[0003]
[Patent Document 1]
JP-A-6-272784
[Problems to be solved by the invention]
However, in this type of poppet type solenoid valve, since the poppet valve is fixed to the tip of the cantilevered valve shaft, when vibration occurs, the poppet valve at the tip of the valve shaft swings easily and tilts, so that the poppet valve operates easily. Sometimes, when the poppet valve is tilted together with the valve shaft, a gap is easily formed between the valve seat and the valve seat when the valve is closed, and there is a problem that the sealing performance at the time of closing the valve is deteriorated.
[0005]
An object of the present invention is to solve the above-described problems, and an object of the present invention is to provide a poppet-type solenoid valve capable of preventing a valve shaft and a poppet valve from oscillating due to vibration or the like and improving sealing performance when the valve is closed. And
[0006]
[Means for Solving the Problems]
In order to achieve the above object, a poppet type solenoid valve according to the present invention has a valve shaft protruding from an electromagnetic drive unit in a valve chamber in a housing, a poppet valve is fixed to the valve shaft, and the valve is driven by the electromagnetic drive unit. In a poppet type solenoid valve in which a shaft and a poppet valve move in the axial direction to open and close, a guide member for guiding the movement of the valve shaft and the poppet valve is attached to the valve shaft on the side opposite to the electromagnetic drive unit with respect to the poppet valve. It is characterized by the following.
[0007]
Here, in the poppet-type solenoid valve, as in claim 2, the guide member includes an annular frame portion and a cross frame portion, and is slidably disposed on the inner wall of the cylindrical portion in the valve chamber. it can.
[0008]
Further, as in the third aspect, the outer peripheral projecting portion is projected from the outer periphery of the annular frame portion of the guide member, and a semi-cylindrical convex curved portion can be formed at the tip of the outer peripheral projecting portion.
[0009]
Further, as in the fourth aspect, an outer peripheral projecting portion is provided on the outer periphery of the annular frame portion of the guide member, and a hemispherical convex curved surface portion can be formed at the tip of the outer peripheral projecting portion.
[0010]
[Action]
In the poppet type solenoid valve having the above-described configuration, the valve shaft and the poppet valve move in the axial direction by the operation of the electromagnetic drive unit, and seat on the valve seat provided in the valve chamber, or separate from the valve seat to open and close the valve. Done. At the time of the operation of the valve opening and closing, the valve shaft and the poppet valve are guided in the axial direction by a guide member attached to the tip of the valve shaft protruding toward the anti-electromagnetic drive side of the poppet valve. That is, for example, since the outer peripheral projection of the annular frame portion of the guide member slides on the inner wall of the cylindrical portion in the valve chamber and its axial movement is guided, the valve shaft and the poppet valve due to vibration during operation and the like. Swing can be prevented.
[0011]
Therefore, it is possible to prevent the poppet valve from tilting due to the runout of the valve shaft, to seat the poppet valve on the valve seat in an appropriate state when the valve is closed, and to improve the sealing performance when the valve is closed. The guide member is composed of an annular frame portion and a cross frame portion, and an outer peripheral projecting portion is protruded on the outer periphery of the annular frame portion, and a semi-cylindrical convex curved surface or a hemispherical shape is provided at the tip of the outer peripheral projecting portion. If a convex curved surface is formed and the convex curved surface is slid on the inner wall of the cylindrical portion in the valve chamber by line contact or point contact, frictional resistance of the guide member is reduced, and foreign matter is caught between the guide members. Inconveniences such as locking by locking in can also be prevented.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a schematic sectional view of a poppet type solenoid valve. Reference numeral 1 denotes a housing of an electromagnetic valve. An electromagnetic solenoid (not shown) is disposed in the electromagnetic drive unit 2, and a plunger is disposed in the electromagnetic solenoid so as to be movable in the axial direction.
[0013]
A valve shaft 3 is connected and fixed to a lower end of a plunger in the electromagnetic drive unit 2, and the valve shaft 3 is vertically movably disposed in a valve chamber 4 provided in the housing 1. Is fixed. The valve chamber 4 includes an upper chamber and a lower chamber, and a conical constricted portion is formed in an intermediate portion between the upper chamber and the lower chamber, and a valve seat 6 is provided therein. An inlet port 8 is provided on the side of the lower chamber, and an outlet port 9 is provided on the side of the upper chamber.
[0014]
The valve seat 6 is formed with a concave conical tapered surface, and a lower portion of the poppet valve 5 is formed with a convex conical tapered portion that can be fitted with the conical tapered surface. 6 and the valve is closed.
[0015]
The tip of the valve shaft 3 projects through the poppet valve 5, and a guide member 10 as shown in FIGS. 2 and 3 guides the upward and downward movement of the poppet valve 5 to the projecting tip of the valve shaft 3. Installed. That is, the cylindrical portion 6a is formed below the valve seat 6, and the guide member 10 is inserted into the inner peripheral wall of the cylindrical portion 6a so as to be vertically slidable.
[0016]
As shown in FIGS. 2 and 3, the guide member 10 is formed by connecting an annular frame portion 11 to an outer peripheral portion of a cross-shaped cross frame portion 12, and a tip of the cross frame portion 12 is provided outside the annular frame portion 11. Are projected to the outer periphery, and outer peripheral projecting portions 13 are formed at four locations at intervals of 90 degrees. A semi-cylindrical convex curved surface portion 13a is formed at the tip of the outer peripheral protruding portion 13 so that the contact portion of the cylindrical portion 6a with the inner peripheral wall is substantially in line contact. As shown in FIG. 2, the tip of the valve shaft 3 protruding below the poppet valve 5 is fixed to the center of the cross frame portion 12 of the guide member 10 and the guide member 10 is mounted. It is slidably inserted into the cylindrical portion 6a of the valve seat 6.
[0017]
The poppet type solenoid valve thus configured is connected to, for example, a cooling water pipe of an internal combustion engine of an automobile and used as a shut-off valve of the cooling water pipe, and its inlet port 8 and outlet port 9 are connected to the pipe. Is done. The electromagnetic drive unit 2 is connected to a driver circuit (not shown), and the poppet-type electromagnetic valve opens and closes by drive control of the driver circuit.
[0018]
For example, when the electromagnetic drive unit 2 is controlled to close in the valve open state as shown in FIG. 1, the electromagnetic solenoid of the electromagnetic drive unit 2 acts to push out a plunger therein, whereby the valve shaft 3 moves as shown in FIG. , The poppet valve 5 descends and sits on the valve seat 6, and the valve is closed. At this time, as the poppet valve 5 descends, the guide member 10 inserted through the cylindrical portion 6a below the valve seat 6 descends while sliding the outer peripheral protruding portion 13 on the inner peripheral surface of the cylindrical portion 6a. It acts to guide the lowering of the valve 5.
[0019]
Therefore, even if the valve shaft 3 of the poppet valve 5 has a cantilever structure, the swing of the valve shaft 3 and the poppet valve 5 is prevented, and when the valve is closed, the poppet valve 5 is properly seated on the valve seat 6. Can be eliminated, and the sealing performance when the valve is closed can be improved.
[0020]
On the other hand, when the electromagnetic drive unit 2 is controlled to open in the valve-closed state as shown in FIG. 4, the electromagnetic solenoid of the electromagnetic drive unit 2 acts to pull back the plunger therein, whereby the valve shaft 3 is moved. The poppet valve 5 rises as shown in FIG. Also at this time, with the rise of the poppet valve 5, the guide member 10 inserted into the cylindrical portion 6a below the valve seat 6 rises while sliding the outer peripheral projecting portion 13 on the inner peripheral surface of the cylindrical portion 6a, Acts to guide the poppet valve 5 up. Therefore, even if the valve shaft 3 of the poppet valve 5 has a cantilever structure, it is possible to prevent the valve shaft 3 and the poppet valve 5 from swinging.
[0021]
As described above, in the present poppet type solenoid valve, the guide member 10 prevents the valve shaft 3 and the poppet valve 5 from oscillating or tilting. However, since the guide member 10 is mounted on the tip end side of the poppet valve 5, Since the guide member 10 is provided on the side opposite to the electromagnetic drive unit 2 with respect to the poppet valve 5, it is possible to more effectively prevent the valve shaft 3 and the poppet valve 5 from swinging and tilting.
[0022]
That is, FIG. 5 shows the deflection of the valve shaft 3 and the poppet valve 5 when the guide members are provided on the electromagnetic drive unit side of the poppet valve and the tip side of the poppet valve. From FIG. 5, when the guide member is provided on the electromagnetic drive unit side with respect to the poppet valve 5, and when the deflection of the guide member is f, the deflection of the poppet valve 5 is 1.5 f. It can be seen that when the guide member is set to f, the run of the poppet valve 5 is reduced to (3/4) f when the guide member is set at the front end side, that is, on the side opposite to the electromagnetic drive section.
[0023]
In the above description, the semi-cylindrical curved surface portion 13a is formed at the tip of the outer peripheral protruding portion 13 of the guide member 10. In this case, the contact with the cylindrical portion 6a can be changed to a point contact to reduce the sliding resistance.
[0024]
6 and 7 show a poppet type solenoid valve according to another embodiment. In the poppet-type solenoid valve of this example, the guide member 20 is fixed to the lower cylindrical portion 6 a of the valve seat 6. Other configurations are the same as those of the above-described embodiment, and the same portions are denoted by the same reference numerals in the drawings and description thereof is omitted.
[0025]
The guide member 20 is fixed to a cylindrical portion 6a below the valve seat 6, and a through hole 20a through which a valve shaft 23 is inserted is formed at the center thereof. The valve shaft 23 is formed such that the lower side is longer than the portion where the poppet valve 5 is fixed and protrudes downward, and the lower end of the valve shaft 23 protruding below slides into the through hole 20a in the center as shown in FIG. It is movably inserted. Since the guide member 20 is fixed to the cylindrical portion 6a, the reinforcing annular frame portion 11 does not need to be provided as described above, and it can be simply composed of only a cross frame portion or only a horizontal frame.
[0026]
In the poppet type electromagnetic valve having such a configuration, for example, when the electromagnetic drive unit 2 is controlled to close in the open state as shown in FIG. 6, the electromagnetic solenoid of the electromagnetic drive unit 2 pushes a plunger therein. 7, the valve shaft 23 is lowered as shown in FIG. 7, the poppet valve 5 is lowered and seated on the valve seat 6, and the valve is closed. At this time, since the lower valve shaft 23 of the poppet valve 5 is inserted into the through hole 20a of the guide member 20 fixed to the cylindrical portion 6a, the valve shaft 23 is guided by the guide member 20 and descends. .
[0027]
Therefore, the valve shaft 3 and the poppet valve 5 are prevented from swinging when descending, and when the valve is closed, the poppet valve 5 is properly seated on the valve seat 6 to eliminate fluid leakage and improve sealing performance when the valve is closed. Can be improved.
[0028]
On the other hand, when the electromagnetic drive unit 2 is controlled to open in the valve closed state as shown in FIG. 7, the electromagnetic solenoid of the electromagnetic drive unit 2 acts to pull back the plunger therein, thereby causing the valve shaft 23 to move as shown in FIG. 6, the poppet valve 5 rises, and the valve is opened. At this time, the distal end of the valve shaft 23 also rises while being guided by the through hole 20a of the guide member 20, so that the valve shaft 23 and the poppet valve 5 can be prevented from swinging.
[0029]
【The invention's effect】
As described above, according to the poppet type solenoid valve of the present invention, when the valve is closed, the valve shaft and the poppet valve are attached to the poppet valve on the side opposite to the electromagnetic drive unit. Since the guide member is guided by the guide member, it is possible to prevent the valve shaft and the poppet valve from swaying due to vibration during operation. Therefore, it is possible to prevent the poppet valve from tilting due to the runout of the valve shaft, to seat the poppet valve on the valve seat in an appropriate state when the valve is closed, and to improve the sealing performance when the valve is closed.
[Brief description of the drawings]
FIG. 1 is a schematic sectional view of a poppet type solenoid valve showing one embodiment of the present invention.
FIG. 2 is an enlarged perspective view of a poppet valve and a guide member.
FIG. 3 is a bottom view of the guide member.
FIG. 4 is a schematic cross-sectional view of a poppet type solenoid valve when the valve is closed.
FIG. 5 is an explanatory diagram showing the swing of the poppet valve when the guide member is provided on the drive unit side of the poppet valve and when the guide member is provided on the non-drive unit side.
FIG. 6 is a schematic sectional view of a poppet-type solenoid valve according to another embodiment when the valve is opened.
FIG. 7 is a schematic sectional view of the poppet type solenoid valve when the valve is closed.
[Explanation of symbols]
1-Housing 2-Electromagnetic Drive 3-Valve Shaft 4-Valve Chamber 5-Popet Valve 6-Valve Seat 10-Guide Member

Claims

A valve shaft protrudes from an electromagnetic drive unit in a valve chamber in the housing, a poppet valve is fixed to the valve shaft, and the valve shaft and the poppet valve are moved in the axial direction by driving the electromagnetic drive unit to open and close. Poppet type solenoid valve
A poppet type electromagnetic valve, wherein a guide member for guiding the movement of the valve shaft and the poppet valve is attached to a valve shaft on a side opposite to the electromagnetic drive unit with respect to the poppet valve.

The poppet-type solenoid valve according to claim 1, wherein the guide member includes an annular frame portion and a cross frame portion, and is slidably disposed on an inner wall of a cylindrical portion in the valve chamber.

3. The poppet type electromagnetic device according to claim 2, wherein an outer peripheral projecting portion protrudes from an outer periphery of the annular frame portion of the guide member, and a semi-cylindrical convex curved surface portion is formed at a tip of the outer peripheral projecting portion. valve.

3. The poppet type solenoid valve according to claim 2, wherein an outer peripheral projecting portion projects from an outer periphery of the annular frame portion of the guide member, and a hemispherical convex curved surface portion is formed at a tip of the outer peripheral projecting portion. .

A valve shaft protrudes from an electromagnetic drive unit in a valve chamber in the housing, a poppet valve is fixed to the valve shaft, and the valve shaft and the poppet valve are moved in the axial direction by driving the electromagnetic drive unit to open and close. Poppet type solenoid valve
A guide member for guiding the movement of the valve shaft and the poppet valve is mounted in a valve chamber on the side opposite to the electromagnetic drive unit with respect to the poppet valve, and a leading end of the valve shaft slides into a through hole formed in the guide member. A poppet-type solenoid valve movably inserted.