JP4896165B2 - Solenoid open / close valve - Google Patents

Solenoid open / close valve Download PDF

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JP4896165B2
JP4896165B2 JP2009005794A JP2009005794A JP4896165B2 JP 4896165 B2 JP4896165 B2 JP 4896165B2 JP 2009005794 A JP2009005794 A JP 2009005794A JP 2009005794 A JP2009005794 A JP 2009005794A JP 4896165 B2 JP4896165 B2 JP 4896165B2
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plunger
buffer member
valve
taper
tapered
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JP2010164104A (en
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一浩 浅井
則夫 和田
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Rinnai Corp
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Rinnai Corp
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    • 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
    • F16K31/06—Actuating devices; Operating means; Releasing devices electric; magnetic using a magnet, e.g. diaphragm valves, cutting off by means of a liquid
    • F16K31/0644—One-way valve
    • F16K31/0655—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
    • F16K31/06—Actuating devices; Operating means; Releasing devices electric; magnetic using a magnet, e.g. diaphragm valves, cutting off by means of a liquid
    • F16K31/0686—Braking, pressure equilibration, shock absorbing
    • F16K31/0696—Shock absorbing, e.g. using a dash-pot

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Magnetically Actuated Valves (AREA)
  • Electromagnets (AREA)

Description

本発明は、バネなどの付勢手段によって閉弁状態が保持されると共に、ソレノイドコイルの電磁力によって開弁状態が保持される電磁開閉弁に関する。   The present invention relates to an electromagnetic on-off valve that is held in a closed state by an urging means such as a spring and that is opened by an electromagnetic force of a solenoid coil.

従来のこの種の電磁開閉弁は、例えばバネで閉弁状態に保持されている弁体を、ソレノイドコイルに通電することにより生じる電磁力で引き上げて開弁させ、さらにソレノイドコイルへ通電し続けることにより開弁状態を保持している。   This type of conventional electromagnetic on-off valve is, for example, a valve body held in a closed state by a spring is lifted by an electromagnetic force generated by energizing the solenoid coil, and further energized to the solenoid coil. The valve is open.

このソレノイドコイルへは直流電流を通電するが、交流を例えば全波整流して直流電流に変換する場合、直流電流が１００Ｈｚもしくは１２０Ｈｚで脈動する。すると、その脈動周波数に同期して、弁体が取り付けられているプランジャが振動する。プランジャはガイドパイプ内を進退するように構成されているため、プランジャが引き上げ方向に後退した際に偏心してガイドパイプとの距離が短くなると、振動しているプランジャがガイドパイプに接触し、プランジャがガイドパイプを叩くことにより大きなノイズ音が発生することになる。   A direct current is applied to the solenoid coil. When the alternating current is converted into a direct current by full-wave rectification, for example, the direct current pulsates at 100 Hz or 120 Hz. Then, the plunger to which the valve element is attached vibrates in synchronization with the pulsation frequency. Since the plunger is configured to advance and retreat in the guide pipe, if the plunger is eccentric when the plunger is retracted in the pulling direction and the distance from the guide pipe decreases, the oscillating plunger contacts the guide pipe, and the plunger A loud noise sound is generated by hitting the guide pipe.

このようなノイズ音の発生を防止するため、プランジャが後退した状態でプランジャを積極的に偏心させ、プランジャをガイドパイプに押し付けることにより、たとえプランジャが振動しても大きなノイズ音が発生しないようにしたものが知られている（例えば、特許文献１参照）。   In order to prevent the generation of such noise noise, the plunger is actively decentered with the plunger retracted, and the plunger is pressed against the guide pipe so that no loud noise is generated even if the plunger vibrates. Is known (for example, see Patent Document 1).

特開２０００−１３０６３０号公報（図２）JP 2000-130630 A (FIG. 2)

上記従来のものでは、開弁状態でプランジャの後端をガイドパイプと固定磁極との間に挟み込ませてガイドパイプに押し付けるものであるため、ガイドパイプおよび固定磁極とプランジャとの間に摩擦力が生じる。閉弁する際にはソレノイドコイルへの通電を停止することにより電磁力を消失させ、バネの付勢力のみによってプランジャを前進させて閉弁する構成であるが、ガイドパイプおよび固定磁極とプランジャとの間に摩擦力が生じていると、付勢力だけでは確実にプランジャを閉弁方向に移動させることができない場合が生じる。   In the above conventional one, the rear end of the plunger is sandwiched between the guide pipe and the fixed magnetic pole and pressed against the guide pipe in the valve open state, so that a frictional force is generated between the guide pipe and the fixed magnetic pole and the plunger. Arise. When closing the valve, the electromagnetic force disappears by stopping energization to the solenoid coil, and the plunger is advanced only by the urging force of the spring to close the valve. If a frictional force is generated between them, there are cases where the plunger cannot be reliably moved in the valve closing direction only by the urging force.

なお、このような閉弁不良を回避するためにはバネの付勢力を大きくすればよいが、開弁する際に大きな電磁力が必要になり、そのため、プランジャの振動が強くなるという弊害が生じる。また、プランジャをガイドパイプに押し付ける力を小さくすることも考えられるが、それではプランジャの振動によるノイズ音の発生を充分に抑制できないという不具合が生じる。   In order to avoid such a valve closing failure, the urging force of the spring may be increased. However, a large electromagnetic force is required when the valve is opened, which causes a disadvantage that the vibration of the plunger becomes strong. . In addition, it is conceivable to reduce the force pressing the plunger against the guide pipe, but this causes a problem that the generation of noise noise due to the vibration of the plunger cannot be sufficiently suppressed.

また、固定磁極の先端の当接面の直径が緩衝部材の先端の当接面の直径より小さいため、固定磁極の当接面の周縁が緩衝部材の当接面に接触する。固定磁極の当接面の周縁は鋭いエッジ状に形成されているので、この周縁で緩衝部材をえぐるように緩衝部材が摩耗するおそれがある。すると、長時間使用すると緩衝部材の当接面の形状が変形し、さらには固定磁極の当接面と接触しないようになり、緩衝部材としての機能を発揮できなくなるおそれがある。   Further, since the diameter of the contact surface at the tip of the fixed magnetic pole is smaller than the diameter of the contact surface at the tip of the buffer member, the peripheral edge of the contact surface of the fixed magnetic pole contacts the contact surface of the buffer member. Since the peripheral edge of the contact surface of the fixed magnetic pole is formed in a sharp edge shape, the buffer member may be worn away so that the buffer member can be swept around by this peripheral edge. Then, when used for a long time, the shape of the contact surface of the buffer member is deformed, and further, it does not come into contact with the contact surface of the fixed magnetic pole, and the function as the buffer member may not be exhibited.

そこで本発明は、上記の問題点に鑑み、開弁状態でのノイズ音の発生を確実に抑制すると共に、緩衝部材の摩耗を防止することのできる電磁開閉弁を提供することを課題とする。   In view of the above problems, an object of the present invention is to provide an electromagnetic on-off valve that can reliably suppress the generation of noise noise in the valve-opened state and can prevent wear of the buffer member.

上記課題を解決するために本発明による電磁開閉弁は、ソレノイドコイルの中心に筒状のガイドパイプを設け、このガイドパイプ内を進退自在のプランジャと、ガイドパイプ内の後部に固定され、プランジャの後方への移動を所定の位置で規制する固定磁極とを備え、プランジャの前端に弁体を設けて、プランジャを前進方向に付勢する付勢手段により弁体を弁口に押接させて弁口を閉弁すると共に、ソレノイドコイルに通電することにより生じる電磁力でプランジャを付勢手段の付勢力に抗して上記所定位置まで後退させて弁口を開弁する電磁開閉弁において、プランジャ側と固定磁極側とのいずれか一方に緩衝部材を取り付け、互いに係合し得るテーパ凸面とテーパ凹面とのうちのいずれか一方を緩衝部材の先端に形成し、プランジャ側と固定磁極側とのうちの他方の先端であって緩衝部材に当接する部分にテーパ凸面とテーパ凹面とのうちの他方を形成し、プランジャが上記所定位置まで後退し保持されている状態で両テーパ面が互いに係合することによってプランジャを位置決めして、ソレノイドコイルへの通電電流が脈動することによりプランジャが振動した場合であっても、プランジャがガイドパイプに接触することを防止する芯出し手段を設け、さらに、緩衝部材のテーパ面の大径部の直径を係合相手のテーパ面の大径部の直径より小さくし、かつ、緩衝部材のテーパ面の小径部の直径を係合相手のテーパ面の小径部の直径より大きくして、緩衝部材のテーパ面に対して、係合相手のテーパ面の端部が接触しないようにして、端部による緩衝部材の摩耗を防止するようにしたことを特徴とする。   In order to solve the above-described problems, an electromagnetic on-off valve according to the present invention is provided with a cylindrical guide pipe at the center of a solenoid coil, and a plunger that is movable forward and backward in the guide pipe and a rear portion in the guide pipe. A fixed magnetic pole for restricting backward movement at a predetermined position, a valve body is provided at the front end of the plunger, and the valve body is pressed against the valve port by a biasing means for biasing the plunger in the forward direction. An electromagnetic on-off valve that opens the valve port by closing the port and retracting the plunger to the predetermined position against the urging force of the urging means by electromagnetic force generated by energizing the solenoid coil. A buffer member is attached to either the fixed magnetic pole side or the fixed magnetic pole side, and one of a tapered convex surface and a tapered concave surface that can be engaged with each other is formed at the tip of the buffer member, and the plunger side A taper convex surface and a taper concave surface are formed on the other tip of the fixed magnetic pole side and abutting against the buffer member, and both tapers are in a state where the plunger is retracted and held to the predetermined position. Centering means for preventing the plunger from contacting the guide pipe even when the plunger is vibrated by positioning the plunger by engaging the surfaces with each other and pulsating the energizing current to the solenoid coil. Further, the diameter of the large diameter portion of the tapered surface of the buffer member is made smaller than the diameter of the large diameter portion of the tapered surface of the mating counterpart, and the diameter of the small diameter portion of the tapered surface of the buffer member is made the tapered shape of the mating counterpart The diameter of the small diameter portion of the surface is made larger so that the end of the tapered surface of the mating counterpart does not come into contact with the tapered surface of the buffer member to prevent wear of the buffer member by the end. Characterized in that the.

上記芯出し手段によりプランジャが後退して所定位置で保持される際に、プランジャがガイドパイプに接触しない中心軸線上の位置で位置決めされるので、プランジャが振動しても大きな音量のノイズ音が発生しない。また、緩衝部材に対して係合する側のテーパ面の端部はエッジ状になり、このエッジ状の周縁が緩衝部材に接触すると緩衝部材が摩耗する。すなわち、緩衝部材は弾性変形するので、エッジ状の周縁が緩衝部材に接触した時点からプランジャが停止するまで、緩衝部材が変形し、その間エッジ状の周縁は緩衝部材に接触したまま緩衝部材の表面を削りながら移動する。そのため、緩衝部材は開弁毎に削られて変形する。   When the plunger is retracted and held at a predetermined position by the centering means, the plunger is positioned at a position on the central axis that does not contact the guide pipe, so a loud noise is generated even if the plunger vibrates. do not do. Further, the end portion of the tapered surface on the side engaged with the buffer member has an edge shape, and the buffer member is worn when the edge of the edge contacts the buffer member. That is, since the buffer member is elastically deformed, the buffer member is deformed from the time when the edge-shaped peripheral edge contacts the buffer member until the plunger stops, while the edge-shaped peripheral edge remains in contact with the buffer member while the surface of the buffer member is in contact with the buffer member. Move while shaving. Therefore, the buffer member is shaved and deformed every time the valve is opened.

そこで、緩衝部材のテーパ面の大径部の直径を係合相手のテーパ面の大径部の直径より小さくし、かつ、緩衝部材のテーパ面の小径部の直径を係合相手のテーパ面の小径部の直径より大きくして緩衝部材にこのような端部が接触しないようにした。   Therefore, the diameter of the large diameter portion of the tapered surface of the buffer member is made smaller than the diameter of the large diameter portion of the tapered surface of the mating counterpart, and the diameter of the small diameter portion of the tapered surface of the buffer member is It was made larger than the diameter of a small diameter part so that such an end part might not contact a buffer member.

なお、緩衝部材のテーパ面に対して係合する側のテーパ面に無電解ニッケルメッキを被着させて摩擦係数を低下させ、上記緩衝部材の摩擦による摩耗を防止することが望ましい。   In addition, it is desirable to prevent wear due to friction of the buffer member by applying electroless nickel plating to the taper surface of the buffer member that is engaged with the taper surface to reduce the friction coefficient.

また、緩衝部材のテーパ面に対して係合する側のテーパ面にフッ素を複合させた無電解ニッケルメッキを被着させて摩擦係数を低下させ、上記緩衝部材の摩擦による摩耗を防止することが望ましい。   In addition, the friction coefficient of the buffer member can be reduced by applying an electroless nickel plating combined with fluorine on the taper surface of the buffer member that is engaged with the taper surface to prevent wear of the buffer member due to friction. desirable.

以上の説明から明らかなように、本発明は、開弁状態において従来のもののようにプランジャをガイドパイプに押し付けるのではなく、ガイドパイプに接触しない中心軸線上の位置に位置決めするので、プランジャに対して閉弁方向への移動を阻害する摩擦力が生じず、そのため、ソレノイドコイルへの通電を停止し付勢力によりプランジャを閉弁方向に移動させる際に、小さな付勢力でプランジャを閉弁方向に移動させることができる。また、緩衝部材に対して当接するテーパ面の端部で緩衝部材を摩耗させることがないので、長期間使用し続けても緩衝部材が変形せず、緩衝機能が損なわれない。   As is clear from the above description, the present invention does not press the plunger against the guide pipe as in the prior art in the valve-open state, but positions it at a position on the central axis that does not contact the guide pipe. Therefore, there is no frictional force that hinders the movement in the valve closing direction.Therefore, when energizing the solenoid coil is stopped and the plunger is moved in the valve closing direction by the biasing force, the plunger is moved in the valve closing direction with a small biasing force. Can be moved. Further, since the buffer member is not worn at the end of the tapered surface that comes into contact with the buffer member, the buffer member is not deformed even if it is used for a long time, and the buffer function is not impaired.

本発明の一実施の形態の構成を示す図The figure which shows the structure of one embodiment of this invention 第１の実施の形態における開弁状態を示す図The figure which shows the valve opening state in 1st Embodiment 第２の実施の形態における開弁状態を示す図The figure which shows the valve opening state in 2nd Embodiment 第３の実施の形態における開弁状態を示す図The figure which shows the valve opening state in 3rd Embodiment 第４の実施の形態における開弁状態を示す図The figure which shows the valve opening state in 4th Embodiment

図１を参照して、１は本発明による電磁開閉弁の一例である。この電磁開閉弁１は流路を形成するマニホールド２に取り付けられており、マニホールド２に形成された弁口２１を開閉するものである。   Referring to FIG. 1, 1 is an example of an electromagnetic on-off valve according to the present invention. The electromagnetic opening / closing valve 1 is attached to a manifold 2 that forms a flow path, and opens and closes a valve port 21 formed in the manifold 2.

電磁開閉弁１には中空のボビンに巻回されたソレノイドコイル３が設けられており、その中空部分には真ちゅう製のガイドパイプ４が装着されている。このガイドパイプ４内には磁性体材料からなるプランジャ５が進退自在に保持されており、プランジャ５の前端には上記弁口２１を開閉するゴム製の弁体５１が取り付けられている。また、このプランジャ５を閉弁方向に付勢するバネ５２が設けられており、このバネ５２の付勢力により弁体５１は弁口２１に押接され、弁口２１を閉弁した状態で保持されるように構成されている。   The electromagnetic on-off valve 1 is provided with a solenoid coil 3 wound around a hollow bobbin, and a brass guide pipe 4 is mounted in the hollow portion. A plunger 5 made of a magnetic material is held in the guide pipe 4 so as to be movable back and forth. A rubber valve body 51 for opening and closing the valve port 21 is attached to the front end of the plunger 5. Further, a spring 52 is provided to urge the plunger 5 in the valve closing direction, and the valve body 51 is pressed against the valve port 21 by the urging force of the spring 52, and the valve port 21 is held in a closed state. It is configured to be.

ソレノイドコイル３に通電すると、ソレノイドコイル３が発生させる電磁力によりプランジャ５は図において上方に引き上げられる。ガイドパイプ４内の後端である上端には固定磁極６が固定されており、ソレノイドコイル３の電磁力により引き上げられたプランジャ５はこの固定磁極６によって上昇端位置が規制される。すなわち、ソレノイドコイル３に通電し続けることによりプランジャ５を上昇端位置、すなわち開弁位置に保持し続けることができ、通電を停止すると、バネ５２の付勢力によりプランジャ５は降下し、弁体５１が弁口２１を閉弁する閉弁位置に移動し、プランジャ５はそのまま閉弁位置で保持される。   When the solenoid coil 3 is energized, the plunger 5 is pulled upward in the figure by the electromagnetic force generated by the solenoid coil 3. A fixed magnetic pole 6 is fixed to the upper end, which is the rear end of the guide pipe 4, and the raised end position of the plunger 5 pulled up by the electromagnetic force of the solenoid coil 3 is regulated by the fixed magnetic pole 6. That is, by continuing to energize the solenoid coil 3, the plunger 5 can be kept in the raised end position, that is, the valve open position. When the energization is stopped, the plunger 5 is lowered by the urging force of the spring 52, and the valve body 51. Moves to the valve closing position for closing the valve port 21, and the plunger 5 is held in the valve closing position as it is.

プランジャ５の後部にはエラストマー製の緩衝部材７を取り付けた。なお、この緩衝部材７は樹脂製やゴム製であってもよい。プランジャ５が電磁力により上昇する際の速度は速いため、プランジャ５が直接固定磁極６に衝突して停止するように構成すると、開弁の際に大きな衝突音が生じる。また、プランジャ５が固定磁極６に密着すると、プランジャ５や固定磁極６が使用中に帯磁した場合に、ソレノイドコイル３への通電を停止しても残留磁力によってプランジャ５が固定磁極６に吸着され、閉弁しない場合が生じる。   An elastomer cushioning member 7 was attached to the rear portion of the plunger 5. The buffer member 7 may be made of resin or rubber. Since the speed at which the plunger 5 is raised by the electromagnetic force is high, if the plunger 5 is configured to directly collide with the fixed magnetic pole 6 and stop, a loud collision sound is generated when the valve is opened. Further, when the plunger 5 comes into close contact with the fixed magnetic pole 6, when the plunger 5 or the fixed magnetic pole 6 becomes magnetized during use, the plunger 5 is attracted to the fixed magnetic pole 6 by the residual magnetic force even if the energization to the solenoid coil 3 is stopped. In some cases, the valve does not close.

そのため緩衝部材７は上記の衝撃音を防止すると共に、開弁状態においてプランジャ５と固定磁極６との間に隙間が確保され密着しないように設けている。そして、本実施の形態では、緩衝部材７にテーパ凸面７１を設けると共に、このテーパ凸面７１に対応するテーパ凹面６１を固定磁極６に設けた。   Therefore, the buffer member 7 is provided so as to prevent the above-described impact sound and ensure that a gap is secured between the plunger 5 and the fixed magnetic pole 6 in the valve-opened state and is not in close contact. In the present embodiment, the buffer member 7 is provided with the tapered convex surface 71, and the tapered concave surface 61 corresponding to the tapered convex surface 71 is provided on the fixed magnetic pole 6.

図１は閉弁状態を示しており、プランジャ５は下降しているが、ソレノイドコイル３に通電し、プランジャ５を引き上げると、図２に示すように、テーパ凸面７１がテーパ凹面６１に当接する。これにより、固定磁極６に対して緩衝部材７が同心に位置決めされる。緩衝部材７はプランジャ５に対して同心に保持されており、また固定磁極６はガイドパイプ４に同心に位置決めされているので、プランジャ５がガイドパイプ４に対して同心に位置決めされることになる。   FIG. 1 shows the valve closed state, and the plunger 5 is lowered, but when the solenoid coil 3 is energized and the plunger 5 is pulled up, the tapered convex surface 71 comes into contact with the tapered concave surface 61 as shown in FIG. . Thereby, the buffer member 7 is positioned concentrically with respect to the fixed magnetic pole 6. Since the buffer member 7 is held concentrically with respect to the plunger 5 and the fixed magnetic pole 6 is positioned concentrically with the guide pipe 4, the plunger 5 is positioned concentrically with respect to the guide pipe 4. .

ところで、緩衝部材７のテーパ凸面７１の大径部７１ａの直径を固定磁極６のテーパ凹面６１の大径部６１ａの直径より小さくし、かつ、テーパ凸面７１の小径部７１ｂの直径をテーパ凸面６１の小径部６１ｂの直径より大きくして、緩衝部材７が摩耗されることを防止するようにした。   By the way, the diameter of the large diameter portion 71 a of the tapered convex surface 71 of the buffer member 7 is made smaller than the diameter of the large diameter portion 61 a of the tapered concave surface 61 of the fixed magnetic pole 6, and the diameter of the small diameter portion 71 b of the tapered convex surface 71 is made tapered. The diameter of the small-diameter portion 61b is made larger to prevent the shock-absorbing member 7 from being worn.

ソレノイドコイル３には直流電流が通電されるが、ダイオード等の整流素子で半端整流もしくは全波整流された脈動する直流が通電されると、脈動周期に同期してプランジャ５が前後方向や直径方向に振動するが、プランジャ５はガイドパイプ４に対して同心に位置決めされており、全周方向に対して同じ幅の隙間が確保されているので、プランジャ５が振動してもプランジャ５がガイドパイプ４に接触することがない。   A direct current is applied to the solenoid coil 3, but when a pulsating direct current that is half-end rectified or full-wave rectified by a rectifying element such as a diode is applied, the plunger 5 is moved in the front-rear direction or the diametrical direction in synchronization with the pulsation cycle. However, since the plunger 5 is positioned concentrically with respect to the guide pipe 4 and a gap having the same width is secured with respect to the entire circumferential direction, the plunger 5 does not move even if the plunger 5 vibrates. 4 is not touched.

なお、図１および図２に示した実施の形態では、緩衝部材７にテーパ凸面７１を形成し、固定磁極６側にテーパ凹面６１を形成したが、図３に示すように、固定磁極６側にテーパ凸面６２を形成すると共に、緩衝部材７にテーパ凹面７２を形成してもよい。   In the embodiment shown in FIG. 1 and FIG. 2, the tapered convex surface 71 is formed on the buffer member 7 and the tapered concave surface 61 is formed on the fixed magnetic pole 6 side. However, as shown in FIG. The tapered convex surface 62 may be formed on the buffer member 7 and the tapered concave surface 72 may be formed on the buffer member 7.

そして、この場合であっても、緩衝部材７のテーパ凸面７２の大径部７２ａの直径を固定磁極６のテーパ凹面６２の大径部６２ａの直径より小さくし、かつ、テーパ凸面７２の小径部７２ｂの直径をテーパ凸面６２の小径部６２ｂの直径より大きくして、緩衝部材７が摩耗されることを防止するようにした。   Even in this case, the diameter of the large-diameter portion 72 a of the tapered convex surface 72 of the buffer member 7 is made smaller than the diameter of the large-diameter portion 62 a of the tapered concave surface 62 of the fixed magnetic pole 6 and the small-diameter portion of the tapered convex surface 72. The diameter of 72b is made larger than the diameter of the small diameter part 62b of the taper convex surface 62, so that the buffer member 7 is prevented from being worn.

また、上記各実施の形態では緩衝部材をプランジャ５の後部に保持したが、図４に示すように、固定磁極６側にテーパ凸面７３を形成した環状の緩衝部材７を取り付け、プランジャ５の後端部分にテーパ凹面５３を形成して、このテーパ凹面５３を緩衝部材７のテーパ凸面７３に当接させることにより、プランジャ５をガイドパイプ４に対して同心に位置決めしてもよい。   In each of the above embodiments, the buffer member is held at the rear portion of the plunger 5, but as shown in FIG. 4, an annular buffer member 7 having a tapered convex surface 73 formed on the fixed magnetic pole 6 side is attached. The plunger 5 may be positioned concentrically with respect to the guide pipe 4 by forming a tapered concave surface 53 at the end portion and bringing the tapered concave surface 53 into contact with the tapered convex surface 73 of the buffer member 7.

そして、この場合も、緩衝部材７のテーパ凸面７３の大径部７３ａの直径をプランジャ５のテーパ凹面５３の大径部５３ａの直径より小さくし、かつ、テーパ凸面７３の小径部７３ｂの直径をテーパ凹面５３の小径部５３ｂの直径より大きくして、緩衝部材７が摩耗されることを防止するようにした。   Also in this case, the diameter of the large diameter portion 73a of the tapered convex surface 73 of the buffer member 7 is made smaller than the diameter of the large diameter portion 53a of the tapered concave surface 53 of the plunger 5, and the diameter of the small diameter portion 73b of the tapered convex surface 73 is set. It was made larger than the diameter of the small diameter part 53b of the taper concave surface 53, and it was made to prevent that the buffer member 7 was worn out.

さらに、上記各実施の形態では、プランジャ５とガイドパイプ４との間に緩衝部材７および固定磁極６を介在させて同心に位置決めしたが、図５に示すように、緩衝部材７をガイドパイプ４に対して直接同心に位置決めさせ、この緩衝部材７のテーパ凹面７４に対してプランジャ５の後端のテーパ凸面５４を当接させることにより、プランジャ５とガイドパイプ４との間に緩衝部材７のみが介在するようにして同心に位置決めするように構成することも可能である。   Further, in each of the above embodiments, the buffer member 7 and the fixed magnetic pole 6 are interposed between the plunger 5 and the guide pipe 4 and positioned concentrically. However, as shown in FIG. Is positioned directly concentrically with respect to the taper concave surface 74 of the buffer member 7, and the taper convex surface 54 at the rear end of the plunger 5 is brought into contact with the buffer member 7 so that only the buffer member 7 is interposed between the plunger 5 and the guide pipe 4. It is also possible to configure so as to be positioned concentrically with intervening.

そして、この場合も、緩衝部材７のテーパ凹面７４の大径部７４ａの直径をプランジャ５のテーパ凸面５４の大径部５４ａの直径より小さくし、かつ、テーパ凹面７４の小径部７４ｂの直径をテーパ凸面５４の小径部５４ｂの直径より大きくして、緩衝部材７が摩耗されることを防止するようにした。   In this case as well, the diameter of the large diameter portion 74a of the tapered concave surface 74 of the buffer member 7 is made smaller than the diameter of the large diameter portion 54a of the tapered convex surface 54 of the plunger 5, and the diameter of the small diameter portion 74b of the tapered concave surface 74 is set. It was made larger than the diameter of the small diameter part 54b of the taper convex surface 54, and it was made to prevent that the buffer member 7 was worn out.

そして、上記各実施の形態において、緩衝部材７のテーパ面に当接する側のテーパ面６１，６２，５３，５４にはいずれも摩擦係数を低下させるため、無電解ニッケルメッキを被着させた。なお、この無電解ニッケルメッキにはフッ素を複合させても良い。なお、本発明では、電気メッキよりも均一な厚みのメッキ層を被着させるために無電解メッキによりメッキ層を被着させることとした。また、フッ素を複合させることにより潤滑性が増す。ここで言うフッ素はフッ化黒鉛などのフッ化炭素樹脂を含むものである。   In each of the above embodiments, electroless nickel plating is applied to the tapered surfaces 61, 62, 53, 54 on the side contacting the tapered surface of the buffer member 7 in order to reduce the friction coefficient. The electroless nickel plating may be combined with fluorine. In the present invention, the plating layer is deposited by electroless plating in order to deposit a plating layer having a more uniform thickness than electroplating. Moreover, lubricity increases by combining fluorine. The fluorine mentioned here includes a fluorocarbon resin such as fluorinated graphite.

なお、本発明は上記した形態に限定されるものではなく、本発明の要旨を逸脱しない範囲内において種々の変更を加えてもかまわない。   In addition, this invention is not limited to an above-described form, You may add a various change in the range which does not deviate from the summary of this invention.

１ 電磁開閉弁
２ マニホールド
３ ソレノイドコイル
４ ガイドパイプ
５ プランジャ
６ 固定磁極
７ 緩衝部材
５１ 弁体
５２ バネ DESCRIPTION OF SYMBOLS 1 Electromagnetic on-off valve 2 Manifold 3 Solenoid coil 4 Guide pipe 5 Plunger 6 Fixed magnetic pole 7 Buffer member 51 Valve body 52 Spring

Claims (3)

ソレノイドコイルの中心に筒状のガイドパイプを設け、このガイドパイプ内を進退自在のプランジャと、ガイドパイプ内の後部に固定され、プランジャの後方への移動を所定の位置で規制する固定磁極とを備え、プランジャの前端に弁体を設けて、プランジャを前進方向に付勢する付勢手段により弁体を弁口に押接させて弁口を閉弁すると共に、ソレノイドコイルに通電することにより生じる電磁力でプランジャを付勢手段の付勢力に抗して上記所定位置まで後退させて弁口を開弁する電磁開閉弁において、プランジャ側と固定磁極側とのいずれか一方に緩衝部材を取り付け、互いに係合し得るテーパ凸面とテーパ凹面とのうちのいずれか一方を緩衝部材の先端に形成し、プランジャ側と固定磁極側とのうちの他方の先端であって緩衝部材に当接する部分にテーパ凸面とテーパ凹面とのうちの他方を形成し、プランジャが上記所定位置まで後退し保持されている状態で両テーパ面が互いに係合することによってプランジャを位置決めして、ソレノイドコイルへの通電電流が脈動することによりプランジャが振動した場合であっても、プランジャがガイドパイプに接触することを防止する芯出し手段を設け、さらに、緩衝部材のテーパ面の大径部の直径を係合相手のテーパ面の大径部の直径より小さくし、かつ、緩衝部材のテーパ面の小径部の直径を係合相手のテーパ面の小径部の直径より大きくして、緩衝部材のテーパ面に対して、係合相手のテーパ面の端部が接触しないようにして、端部による緩衝部材の摩耗を防止するようにしたことを特徴とする電磁開閉弁。   A cylindrical guide pipe is provided at the center of the solenoid coil, and a plunger that can be moved forward and backward in the guide pipe, and a fixed magnetic pole that is fixed to the rear portion of the guide pipe and restricts the rearward movement of the plunger at a predetermined position. It is generated by providing a valve body at the front end of the plunger, closing the valve opening by pressing the valve body against the valve opening by the urging means for urging the plunger in the forward direction, and energizing the solenoid coil. In the electromagnetic on-off valve that opens the valve port by retracting the plunger against the urging force of the urging means by electromagnetic force, a buffer member is attached to either the plunger side or the fixed magnetic pole side, One of a tapered convex surface and a tapered concave surface that can be engaged with each other is formed at the tip of the buffer member, and the other tip of the plunger side and the fixed magnetic pole side is formed on the buffer member. The other of the taper convex surface and the taper concave surface is formed at the contact portion, and the plunger is positioned by engaging the taper surfaces with each other while the plunger is retracted and held to the predetermined position. Even when the plunger oscillates due to the pulsation of the energizing current, centering means for preventing the plunger from contacting the guide pipe is provided, and the diameter of the large diameter portion of the tapered surface of the buffer member is Make the diameter of the taper surface of the buffer member smaller than the diameter of the large diameter portion of the mating taper surface and make the diameter of the small diameter portion of the taper surface of the buffer member larger than the diameter of the small diameter portion of the taper surface of the mating mating member. On the other hand, the electromagnetic on-off valve is characterized in that the end of the tapered surface of the mating mating member does not come into contact to prevent wear of the buffer member by the end. 緩衝部材のテーパ面に対して係合する側のテーパ面に無電解ニッケルメッキを被着させて摩擦係数を低下させ、上記緩衝部材の摩擦による摩耗を防止することを特徴とする請求項１に記載の電磁開閉弁。   2. The frictional coefficient of the buffer member is reduced by applying electroless nickel plating to the taper surface of the buffer member that is engaged with the taper surface, thereby preventing wear of the buffer member due to friction. The described electromagnetic on-off valve. 緩衝部材のテーパ面に対して係合する側のテーパ面にフッ素を複合させた無電解ニッケルメッキを被着させて摩擦係数を低下させ、上記緩衝部材の摩擦による摩耗を防止することを特徴とする請求項１に記載の電磁開閉弁。   A taper surface on the side engaged with the taper surface of the buffer member is coated with an electroless nickel plating combined with fluorine to reduce the friction coefficient, thereby preventing wear of the buffer member due to friction. The electromagnetic on-off valve according to claim 1.
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