JP6745636B2 - Expansion valve - Google Patents

Expansion valve Download PDF

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JP6745636B2
JP6745636B2 JP2016089005A JP2016089005A JP6745636B2 JP 6745636 B2 JP6745636 B2 JP 6745636B2 JP 2016089005 A JP2016089005 A JP 2016089005A JP 2016089005 A JP2016089005 A JP 2016089005A JP 6745636 B2 JP6745636 B2 JP 6745636B2
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valve
valve body
support member
hole
guide portion
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JP2017198387A (en
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秀幸 柳屋
秀幸 柳屋
良二 渡邉
良二 渡邉
充晶 伊坂
充晶 伊坂
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Fujikoki Corp
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Description

本発明は、冷凍サイクルに用いられる感温機構内蔵型の膨張弁に関する。 The present invention relates to an expansion valve with a built-in temperature sensing mechanism used in a refrigeration cycle.

従来、自動車に搭載される空調装置等に用いる冷凍サイクルについては、冷媒の通過量を温度に応じて調整する感温機構内蔵型の温度膨張弁が使用されている。このような膨張弁の弁本体は、高圧の冷媒が導入される入口ポートと入口ポートに連通する弁室とを有するとともに、弁本体の頂部には、パワーエレメントと称する弁体の駆動機構が装備される。 2. Description of the Related Art Conventionally, for a refrigeration cycle used in an air conditioner mounted on an automobile, a temperature expansion valve with a built-in temperature sensing mechanism that adjusts the amount of refrigerant passing according to temperature has been used. The valve body of such an expansion valve has an inlet port into which high-pressure refrigerant is introduced and a valve chamber communicating with the inlet port, and a valve element drive mechanism called a power element is provided at the top of the valve body. To be done.

弁室内に配設される球状の弁体は、弁室に開口する弁孔の弁座に対向し配置される。弁体は、弁室内に配置された支持部材に支持され、弁本体に取り付けられた調整ねじと支持部材との間に設置されたコイルバネにより弁座方向へ付勢される。そして、弁体は、パワーエレメントにより駆動される弁棒により操作されて、弁座との間の絞り通路の開度を制御する。また、弁孔を通った冷媒は、出口ポートから蒸発器側へ送られる。 The spherical valve body arranged in the valve chamber is arranged so as to face the valve seat of the valve hole opened in the valve chamber. The valve element is supported by a support member arranged in the valve chamber, and is urged toward the valve seat by a coil spring installed between the adjusting screw attached to the valve body and the support member. The valve element is operated by the valve rod driven by the power element to control the opening degree of the throttle passage between the valve element and the valve seat. Further, the refrigerant having passed through the valve hole is sent from the outlet port to the evaporator side.

ここで、入口ポートから流れてきた高圧冷媒は、弁室を通過するが、膨張弁に送り込まれる高圧冷媒には、冷凍サイクル内において上流側で圧力変動が発生する場合があり、その圧力変動が伝達されると、弁体の動作を不安定にするという問題を生じる場合がある。この圧力変動が弁体の振動の原因となり、異音を発生することとなった。 Here, the high-pressure refrigerant flowing from the inlet port passes through the valve chamber, but the high-pressure refrigerant sent to the expansion valve may have a pressure fluctuation on the upstream side in the refrigeration cycle. When transmitted, it may cause a problem of destabilizing the operation of the valve body. This pressure fluctuation causes vibration of the valve element, which causes abnormal noise.

このような振動を防止するため、従来、弁棒の側面を支持する防振バネを設置する構成が開示されている（例えば、特許文献１参照）。 In order to prevent such a vibration, a configuration has conventionally been disclosed in which a vibration-proof spring that supports the side surface of the valve rod is installed (for example, see Patent Document 1).

特開２００４−２９３７７９号公報JP 2004-293779 A

従来の防振構造は大きな防振効果を有するものの、さらに高い防振効果が望まれている。特に、入口ポートに連通する弁室内に配置される弁体を支持する支持部材も圧力変動の影響を受けるため、支持部材が振動をすると弁体の振動の原因にもなった。 Although the conventional anti-vibration structure has a large anti-vibration effect, a higher anti-vibration effect is desired. In particular, the support member that supports the valve element that is arranged in the valve chamber that communicates with the inlet port is also affected by the pressure fluctuation, and thus the vibration of the support member also causes the vibration of the valve element.

そこで、本発明の目的は、弁体及び支持部材の防振をする膨張弁を提供することにある。 Therefore, it is an object of the present invention to provide an expansion valve that isolates the valve body and the support member from vibrations.

上記目的を達成するために、代表的な本発明による膨張弁の一つは、冷媒が流入する入口ポートと冷媒が流出する出口ポートとを連通する弁孔を備えた弁本体と、前記弁孔を流れる冷媒の量を調節する弁体と、前記弁本体に取り付けられて弁棒を介して前記弁体を駆動するパワーエレメントと、前記弁体を支持する支持部材と、前記支持部材を介して前記弁体を閉弁方向に押圧するコイルバネと、ガイド部を有するとともに前記弁本体に螺合され前記コイルバネの押圧力を調整する調整ねじと、を備え、前記支持部材は、摺動部を有し、前記ガイド部は前記摺動部へ摺動自在に挿入されて横方向のずれを発生させない嵌合距離を保ちながら前記支持部材の前記弁体の開閉方向以外の方向の動きを規制し、前記ガイド部の外周に前記弁体の開閉方向に延びる溝を形成して、前記摺動部と前記ガイド部で形成される内部空間とその外側とを連通する均圧通路とする。
さらに、本発明による膨張弁の一つは、前記摺動部に、前記内部空間とその外側とを連通する孔を形成して均圧通路とする。 In order to achieve the above object, one of the typical expansion valves according to the present invention is a valve body having a valve hole that communicates an inlet port into which a refrigerant flows and an outlet port from which a refrigerant flows, and the valve hole. A valve element that adjusts the amount of refrigerant flowing through the valve body, a power element that is attached to the valve body and drives the valve element through a valve rod, a support member that supports the valve element, and a support member. Yes a coil spring for pressing the valve body in the valve closing direction, and a adjusting screw for adjusting a pressing force of the coil spring is screwed to the valve body and having a guide portion, the support member, the sliding portion However, the guide portion is slidably inserted into the sliding portion and regulates the movement of the support member in a direction other than the opening/closing direction of the valve body while maintaining a fitting distance that does not cause a lateral displacement. A groove extending in the opening/closing direction of the valve body is formed on the outer periphery of the guide portion to form a pressure equalizing passage that connects the internal space formed by the sliding portion and the guide portion and the outside thereof .
Further, in one of the expansion valves according to the present invention, a hole that connects the internal space and the outside thereof is formed in the sliding portion to form a pressure equalizing passage.

また、本発明による膨張弁の一つは、冷媒が流入する入口ポートと冷媒が流出する出口ポートとを連通する弁孔を備えた弁本体と、前記弁孔を流れる冷媒の量を調節する弁体と、前記弁本体に取り付けられて弁棒を介して前記弁体を駆動するパワーエレメントと、前記弁体を支持する支持部材と、前記支持部材を介して前記弁体を閉弁方向に押圧するコイルバネと、前記弁体方向へ延び前記コイルバネの内径に入る大きさのガイド部を有するとともに前記弁本体に螺合され前記コイルバネの押圧力を調整する調整ねじと、を備え、前記支持部材は、摺動部を有し、前記摺動部は前記ガイド部へ摺動自在に挿入されて横方向のずれを発生させない嵌合距離を保ちながら前記支持部材の前記弁体の開閉方向以外の方向の動きを規制し、前記摺動部の外周に前記弁体の開閉方向に延びる溝を形成して、前記摺動部と前記ガイド部で形成される内部空間とその外側とを連通する均圧通路とする。
さらに、本発明による膨張弁の一つは、前記ガイド部に、前記内部空間とその外側とを連通する孔を形成して均圧通路とする。 Further, one of the expansion valves according to the present invention is a valve body having a valve hole that communicates an inlet port into which a refrigerant flows with an outlet port from which a refrigerant flows, and a valve that adjusts the amount of the refrigerant flowing through the valve hole. Body, a power element that is attached to the valve body and drives the valve body through a valve rod, a support member that supports the valve body, and presses the valve body in the valve closing direction through the support member. The coil spring, and an adjusting screw that has a guide portion that extends in the valve body direction and has a size that fits in the inner diameter of the coil spring, and that is screwed into the valve body and that adjusts the pressing force of the coil spring. A direction other than the opening/closing direction of the valve body of the support member while maintaining a fitting distance in which the sliding part is slidably inserted into the guide part and does not cause a lateral displacement. Is regulated, and a groove extending in the opening/closing direction of the valve body is formed on the outer periphery of the sliding portion to equalize the internal space formed by the sliding portion and the guide portion and the outside thereof. Use as a passage.
Further, in one of the expansion valves according to the present invention, a hole for communicating the internal space and the outside thereof is formed in the guide portion to form a pressure equalizing passage.

この発明による膨張弁は、上記のように構成されているので、弁体を支持する支持部材をガイドして弁体及び支持部材の防振をすることができる。 Since the expansion valve according to the present invention is configured as described above, it is possible to guide the support member that supports the valve body and to perform vibration isolation of the valve body and the support member.

本発明による膨張弁の第１実施例を示す縦断面図である。1 is a vertical sectional view showing a first embodiment of an expansion valve according to the present invention. 第１実施例の膨張弁の要部の縦断面図である。It is a longitudinal cross-sectional view of the main part of the expansion valve of the first embodiment. 第１実施例の膨張弁の要部の分解斜視図である。It is a disassembled perspective view of the principal part of the expansion valve of 1st Example. 第２実施例の膨張弁の要部の縦断面図である。It is a longitudinal section of an important section of an expansion valve of a 2nd example. 第２実施例の膨張弁の要部の分解斜視図である。It is a disassembled perspective view of the principal part of the expansion valve of 2nd Example.

＜第１実施例＞
図１は、本発明による膨張弁の第１実施例を示す縦断面図である。図２は、第１実施例の膨張弁の要部の縦断面図である。図３は、第１実施例の膨張弁の要部の分解斜視図である。 <First embodiment>
FIG. 1 is a vertical sectional view showing a first embodiment of an expansion valve according to the present invention. FIG. 2 is a vertical cross-sectional view of the main part of the expansion valve of the first embodiment. FIG. 3 is an exploded perspective view of a main part of the expansion valve of the first embodiment.

図１に示すように、膨張弁１０は、弁本体１１、パワーエレメント７０、弁体４０、弁棒６０、防振部材６２、支持部材１００、コイルバネ４４、調整ねじ１２０を備えている。 As shown in FIG. 1, the expansion valve 10 includes a valve body 11, a power element 70, a valve body 40, a valve rod 60, a vibration damping member 62, a support member 100, a coil spring 44, and an adjusting screw 120.

弁本体１１は、例えばアルミ合金製であって、例えば図１のＸ方向を押出方向として、アルミ合金等を押出成形し、これに機械加工を施すことによって得ることができる。この弁本体１１は、上面部に形成されパワーエレメント７０の雄ねじ７２ａに螺合してこれを固定する雌ねじであるパワーエレメント取付部１２と、高圧の冷媒が導入される入口ポート２０と、入口ポート２０より流入した冷媒が流出する冷媒の出口ポート２８と、冷媒の戻り通路３０と、防振部材６２を取り付ける穴部３３と、弁本体１１の底面部に形成された雌ねじ穴１１ａと、弁本体１１を図示されない蒸発器や他の部品等に取り付けるための取付穴（あるいは取付用雌ねじ）８０等とを有する。 The valve body 11 is made of, for example, an aluminum alloy, and can be obtained, for example, by extrusion-molding an aluminum alloy or the like with the X direction in FIG. 1 as the extrusion direction and subjecting this to machining. The valve body 11 has a power element mounting portion 12, which is a female screw formed on an upper surface portion and screwed into a male screw 72a of the power element 70 to fix the male screw 72a, an inlet port 20 into which high-pressure refrigerant is introduced, and an inlet port. A refrigerant outlet port 28 through which the refrigerant that has flowed in from 20 flows out, a refrigerant return passage 30, a hole portion 33 to which a vibration damping member 62 is attached, a female screw hole 11a formed in the bottom surface portion of the valve body 11, and a valve body. 11 has a mounting hole (or a female screw for mounting) 80 for mounting 11 to an evaporator or other parts not shown.

パワーエレメント取付部１２は、弁本体１１の上端において弁本体１１の上面に円形状に開口し、その内壁面に雌ねじを有する有底の円筒状穴として形成される。この穴の底部中央には戻り通路３０に至る（連通する）開口３２が形成されている。ここで、パワーエレメント取付部１２の中心軸の方向は、戻り通路３０内を通過する冷媒の通過方向（Ｘ方向）とほぼ直交する方向（Ｙ方向）となっている。 The power element mounting portion 12 is formed as a bottomed cylindrical hole having a circular opening on the upper surface of the valve body 11 at the upper end of the valve body 11 and having an internal thread on its inner wall surface. At the center of the bottom of this hole, an opening 32 is formed (communicating) with the return passage 30. Here, the direction of the central axis of the power element mounting portion 12 is a direction (Y direction) substantially orthogonal to the passing direction (X direction) of the refrigerant passing through the return passage 30.

雌ねじ穴１１ａは、弁本体１１の下面で、下端部に開口して形成されており、その上部に挿入穴１１ｂが形成されている。雌ねじ穴１１ａの開口部分を調整ねじ１２０で封鎖することにより弁本体１１の内部に弁室２４が形成される。 The female screw hole 11a is formed on the lower surface of the valve body 11 so as to open at the lower end portion, and the insertion hole 11b is formed at the upper portion thereof. By closing the opening of the female screw hole 11a with the adjusting screw 120, the valve chamber 24 is formed inside the valve body 11.

入口ポート２０は、弁室２４の側方から小径穴２０ａを介して弁室２４と連通して形成されている。また、出口ポート２８は、弁室２４の上方に形成されている。この出口ポート２８は、オリフィスとなる弁孔２６を介して弁室２４の上端部に連通している。また、弁孔２６の弁室２４側には、弁座２５が形成されている。弁本体１１には上下方向（図１におけるＹ方向）に通し孔２９が形成されている。そして、弁孔２６と通し孔２９と開口３２と弁室２４は、それぞれの中心軸が同一直線上になるように配置されている。戻り通路３０は、弁本体１１における出口ポート２８のさらに上方に形成され、弁本体１１を横方向（図１におけるＸ方向）に貫通するように形成されている。また、戻り通路３０の下側に、通し孔２９と同軸で通し孔２９よりも内径の大きい穴部３３が形成されている。 The inlet port 20 is formed to communicate with the valve chamber 24 from the side of the valve chamber 24 via the small diameter hole 20a. The outlet port 28 is formed above the valve chamber 24. The outlet port 28 communicates with the upper end of the valve chamber 24 via a valve hole 26 serving as an orifice. A valve seat 25 is formed on the valve chamber 24 side of the valve hole 26. A through hole 29 is formed in the valve body 11 in the vertical direction (Y direction in FIG. 1). The valve hole 26, the through hole 29, the opening 32, and the valve chamber 24 are arranged so that their central axes are on the same straight line. The return passage 30 is formed further above the outlet port 28 in the valve body 11 and penetrates the valve body 11 in the lateral direction (X direction in FIG. 1). A hole 33 coaxial with the through hole 29 and having a larger inner diameter than the through hole 29 is formed below the return passage 30.

パワーエレメント７０は、例えばステンレス鋼等で形成された上蓋部材７１及び中央部に貫通口を備えた受け部材７２と、これら上蓋部材７１及び受け部材７２の間に挟み込まれるダイアフラム７３と、このダイアフラム７３及び受け部材７２の間に配置されたストッパ部材９０等から構成されている。そして、上蓋部材７１、ダイアフラム７３及び受け部材７２を重ね合わせた端部を周溶接することにより、これらは一体化されている。上蓋部材７１とダイアフラム７３との間には、圧力作動室７５が形成され、この圧力作動室７５内に作動ガスが封入された後、封止栓６５で封止される。受け部材７２の下部は円筒状でその周囲には雄ねじ７２ａが形成され、パワーエレメント取付部１２の雌ねじ（弁本体１１の上面に形成された雌ねじ）と螺合する。パワーエレメント７０はパッキン３５を介して弁本体１１に取付けられている。 The power element 70 includes, for example, an upper lid member 71 formed of stainless steel or the like, a receiving member 72 having a through hole in a central portion, a diaphragm 73 sandwiched between the upper lid member 71 and the receiving member 72, and the diaphragm 73. And a stopper member 90 arranged between the receiving member 72 and the like. Then, the upper lid member 71, the diaphragm 73, and the receiving member 72 are integrated by circumferentially welding the overlapped end portions. A pressure working chamber 75 is formed between the upper lid member 71 and the diaphragm 73, and a working gas is filled in the pressure working chamber 75 and then sealed with a sealing plug 65. The lower portion of the receiving member 72 has a cylindrical shape, and a male screw 72a is formed on the periphery thereof and is screwed with a female screw (a female screw formed on the upper surface of the valve body 11) of the power element mounting portion 12. The power element 70 is attached to the valve body 11 via the packing 35.

弁体４０は、弁座２５に対向するように配置された球状の部材であり、弁室２４内に設けられている。弁棒６０は、弁本体１１の弁孔２６、通し孔２９及び開口３２のそれぞれに挿通される態様で設けられており、弁棒６０の上端は、パワーエレメント７０のストッパ部材９０の下面の受け部９２に当接し、その下端は、弁体４０と接触するように配置される。 The valve body 40 is a spherical member arranged so as to face the valve seat 25, and is provided inside the valve chamber 24. The valve rod 60 is provided so as to be inserted into each of the valve hole 26, the through hole 29, and the opening 32 of the valve body 11, and the upper end of the valve rod 60 receives the lower surface of the stopper member 90 of the power element 70. It abuts against the portion 92, and its lower end is arranged to come into contact with the valve body 40.

防振部材６２は、穴部３３に装着されて、弁棒６０を横方向から押圧する構成となっている。具体的には、例えば、板バネ状の部材を複数用意して、弁棒６０の周囲を複数方向から板バネ状の部材の弾性により押圧する等である。これにより、弁棒６０及び弁体４０の振動を防止する効果を発揮する。 The vibration-proof member 62 is mounted in the hole 33 to press the valve rod 60 laterally. Specifically, for example, a plurality of leaf spring-shaped members are prepared, and the periphery of the valve rod 60 is pressed from a plurality of directions by the elasticity of the leaf spring-shaped members. Thereby, the effect of preventing the vibration of the valve rod 60 and the valve body 40 is exhibited.

支持部材１００は、弁体４０を弁座２５の方向に支持する部材であり、弁体４０が支持部材１００に固定されている構成でもよい。支持部材１００は、本体部１０３、上面１０１、フランジ部１０２、摺動部１０５を備えている。円柱状の本体部１０３の上面は円錐状のくぼみを備えて弁体４０の下面を支持する上面１０１となっている。また、本体部１０３より側面（外周側に）に突出するフランジ部１０２を備えており、当該フランジ部１０２の下面がコイルバネ４４の一端を受ける構造となっている。このときコイルバネ４４の内径内にフランジ部１０２より下側の本体部１０３が入るように構成される。 The support member 100 is a member that supports the valve body 40 in the direction of the valve seat 25, and the valve body 40 may be fixed to the support member 100. The support member 100 includes a body portion 103, an upper surface 101, a flange portion 102, and a sliding portion 105. The upper surface of the cylindrical main body 103 is a top surface 101 having a conical recess and supporting the lower surface of the valve body 40. Further, a flange portion 102 that protrudes from the main body portion 103 to the side surface (outer peripheral side) is provided, and the lower surface of the flange portion 102 is configured to receive one end of the coil spring 44. At this time, the main body 103 below the flange 102 is inserted into the inner diameter of the coil spring 44.

摺動部１０５は、本体部１０３の下部に設けられ、下側が開口している円筒形状となっている。摺動部１０５の外径は本体部１０３の外径と同じであり、コイルバネ４４の内径内に入る大きさとなっている。そして、摺動部１０５における円筒の内周部１０５ａ内にはガイド部１２７が挿入され、摺動部１０５の円筒の内径はガイド部１２７と摺動可能に嵌め合うことができる大きさである。 The sliding portion 105 is provided in the lower portion of the main body portion 103 and has a cylindrical shape whose lower side is open. The outer diameter of the sliding portion 105 is the same as the outer diameter of the main body portion 103, and has a size that falls within the inner diameter of the coil spring 44. Then, the guide portion 127 is inserted into the inner peripheral portion 105a of the cylinder of the sliding portion 105, and the inner diameter of the cylinder of the sliding portion 105 is of a size such that it can slidably fit with the guide portion 127.

コイルバネ４４は、支持部材１００に設けられたフランジ部１０２の下面と調整ねじ１２０に形成された凹部１２５との間に設置されている。このコイルバネ４４の付勢力により、弁体４０は支持部材１００を介して弁座２５に向けて付勢されている。 The coil spring 44 is installed between the lower surface of the flange portion 102 provided on the support member 100 and the recess 125 formed on the adjusting screw 120. The urging force of the coil spring 44 urges the valve body 40 toward the valve seat 25 via the support member 100.

調整ねじ１２０は、本体部１２１、六角穴１２２、挿入部１２３、先端部１２４、凹部１２５、ガイド部１２７を備えている。挿入部１２３は本体部１２１の上部に本体部１２１よりも外径が縮径して設けられ、先端部１２４は挿入部１２３の上部に挿入部１２３よりも外径が縮径して設けられている。また、本体部１２１の外周は弁本体１１の下面に開口する雌ねじ穴１１ａに螺合するための雄ねじ部１２１ａとなっている。さらに、調整ねじ１２０の上部には、上部が開口して円筒状の空間を有する凹部１２５が設けられている。凹部１２５は本体部１２１近辺まで達する深さに形成されている。また、凹部１２５の内径は、コイルバネ４４が凹部１２５内に挿入してずれないようにコイルバネ４４の外径に合わせた大きさとなっている。また、調整ねじ１２０（本体部１２１）の下部には、六角穴１２２が設けられている。 The adjusting screw 120 includes a main body 121, a hexagonal hole 122, an insertion portion 123, a tip portion 124, a recess 125, and a guide portion 127. The insertion portion 123 is provided on the upper portion of the main body portion 121 with a smaller outer diameter than the main body portion 121, and the tip portion 124 is provided on the upper portion of the insertion portion 123 with a smaller outer diameter than the insertion portion 123. There is. Further, the outer circumference of the main body portion 121 is a male screw portion 121a to be screwed into a female screw hole 11a opened on the lower surface of the valve body 11. Further, a concave portion 125 having an open top and a cylindrical space is provided in the upper portion of the adjusting screw 120. The recess 125 is formed to a depth reaching the vicinity of the main body 121. Further, the inner diameter of the recess 125 is sized according to the outer diameter of the coil spring 44 so that the coil spring 44 is inserted into the recess 125 and is not displaced. Further, a hexagonal hole 122 is provided in the lower portion of the adjusting screw 120 (main body portion 121).

さらに、凹部１２５の底部１２６の中心付近から上方向に延びる円柱状のガイド部１２７が形成されている。ガイド部１２７は、支持部材１００の摺動部１０５に挿入するための外径と、摺動のために必要な長さを有している。また、ガイド部１２７には、上下方向全域に渡って、外周部１２７ａの一部を切り欠いた状態で形成される溝１２８が形成されている。 Further, a cylindrical guide portion 127 extending upward from the vicinity of the center of the bottom 126 of the recess 125 is formed. The guide portion 127 has an outer diameter for insertion into the sliding portion 105 of the support member 100 and a length necessary for sliding. Further, the guide portion 127 is formed with a groove 128 formed in a state where a part of the outer peripheral portion 127a is cut out over the entire area in the vertical direction.

調整ねじ１２０の弁本体１１への取り付けは、調整ねじ１２０を弁本体１１の下端から挿入し、六角穴１２２に図示されない工具を差し込んで回転させることにより取り付け、そのねじ込み量を調整することができる。この調整ねじ１２０のねじ込み量を調整することにより、弁体４０及び支持部材１００を支持するコイルバネ４４のばね力を調整することができる。このとき、調整ねじ１２０の挿入部１２３は弁本体１１の挿入穴１１ｂに挿入され、さらにそれより弁室２４側では、調整ねじ１２０の先端部１２４外周と弁本体１１の挿入穴１１ｂ内周の間にＯリング等のシール部材５４が配置され、これによって弁室２４が当該膨張弁１０の外側雰囲気に対してシールされている。 The adjustment screw 120 can be attached to the valve body 11 by inserting the adjustment screw 120 from the lower end of the valve body 11, inserting a tool (not shown) into the hexagonal hole 122 and rotating the hexagonal hole 122, and adjusting the screwing amount. .. By adjusting the screwing amount of the adjusting screw 120, the spring force of the coil spring 44 supporting the valve body 40 and the supporting member 100 can be adjusted. At this time, the insertion portion 123 of the adjusting screw 120 is inserted into the insertion hole 11b of the valve body 11, and further on the valve chamber 24 side thereof, the outer periphery of the tip portion 124 of the adjusting screw 120 and the inner periphery of the insertion hole 11b of the valve body 11 are arranged. A seal member 54 such as an O-ring is disposed between the valve chamber 24 and the expansion chamber 10 so that the outside of the expansion valve 10 is sealed.

支持部材１００の調整ねじ１２０への装着は、調整ねじ１２０の凹部１２５にコイルバネ４４を挿入して、上部から支持部材１００を装着する。このとき、コイルバネ４４の内径内では、調整ねじ１２０のガイド部１２７と支持部材１００の摺動部１０５が存在し、支持部材１００の摺動部１０５に調整ねじ１２０のガイド部１２７が挿入される。この挿入による上下方向の両者の嵌合距離Ａは、弁体４０が弁座２５に当接する最上部に位置する場合においても、支持部材１００の横方向のずれを発生させない嵌合距離（最少嵌合距離）を保つように設定される。また、摺動部１０５の上下方向の長さＢは、支持部材１００が摺動に必要な範囲（摺動範囲）を動けて、かつ、少なくとも最少嵌合距離を保つようにするため、摺動範囲に最少嵌合距離を足した距離以上になるように設定される。また、嵌合は、ガイド部１２７の外周部１２７ａと摺動部１０５の内周部１０５ａにより行われ、これらの間のクリアランスは、抵抗が少なく支持部材１００が上下方向に移動できるクリアランスで設定される。 To attach the support member 100 to the adjustment screw 120, the coil spring 44 is inserted into the recess 125 of the adjustment screw 120, and the support member 100 is attached from above. At this time, the guide portion 127 of the adjusting screw 120 and the sliding portion 105 of the support member 100 exist within the inner diameter of the coil spring 44, and the guide portion 127 of the adjusting screw 120 is inserted into the sliding portion 105 of the support member 100. .. The vertical fitting distance A due to this insertion does not cause lateral displacement of the support member 100 (minimum fitting) even when the valve body 40 is located at the uppermost portion in contact with the valve seat 25. It is set so as to keep the distance. Further, the vertical length B of the sliding portion 105 is set so that the supporting member 100 can move within a range required for sliding (sliding range) and at least maintain a minimum fitting distance. It is set to be equal to or greater than the distance obtained by adding the minimum fitting distance to the range. Further, the fitting is performed by the outer peripheral portion 127a of the guide portion 127 and the inner peripheral portion 105a of the sliding portion 105, and the clearance between them is set to a clearance that has a low resistance and allows the support member 100 to move in the vertical direction. It

次に、作用について説明する。本発明の第１実施例の膨張弁１０においては、冷媒は入口ポート２０から小径穴２０ａを通って流入し、弁室２４及び弁孔２６を通過して膨張され、出口ポート２８から蒸発器（図示せず）へ送り出される。また、この蒸発器から送り出された冷媒は、戻り通路３０の左側入口から入って右側出口に抜けるように通過し、圧縮機（図示せず）へ戻る。このとき、戻り通路３０内を通過する冷媒の一部は開口３２からパワーエレメント７０の下部に流入する。そしてパワーエレメント７０の下部に流入した冷媒の温度変化に応じて圧力作動室７５内の作動ガスの圧力を変化させる。このとき、圧力作動室７５における内圧の変動に応じて変形したダイアフラム７３の動きを受け、ストッパ部材９０が上下動する。そして、ストッパ部材９０の移動が弁棒６０を介して弁体４０に伝達される。これにより、膨張弁としての役割を果たすことができる。 Next, the operation will be described. In the expansion valve 10 of the first embodiment of the present invention, the refrigerant flows from the inlet port 20 through the small diameter hole 20a, is expanded through the valve chamber 24 and the valve hole 26, and is expanded from the outlet port 28 to the evaporator ( (Not shown). The refrigerant sent from the evaporator passes through the return passage 30 so that it enters from the left inlet and exits to the right outlet, and returns to the compressor (not shown). At this time, a part of the refrigerant passing through the return passage 30 flows into the lower portion of the power element 70 through the opening 32. Then, the pressure of the working gas in the pressure working chamber 75 is changed according to the temperature change of the refrigerant flowing into the lower portion of the power element 70. At this time, the stopper member 90 moves up and down in response to the movement of the diaphragm 73 deformed according to the change of the internal pressure in the pressure working chamber 75. Then, the movement of the stopper member 90 is transmitted to the valve body 40 via the valve rod 60. This can serve as an expansion valve.

支持部材１００は、調整ねじ１２０のガイド部１２７と支持部材１００の摺動部１０５の嵌合の構成により、弁体４０の開閉方向（上下方向）へ動くようにガイドされている。この構成により、入口ポート２０からの高圧冷媒の圧力変動に対して支持部材１００や弁体４０の開閉方向以外の方向（横方向）の動きを規制し、これにより横方向の振動を防止し、異音の発生を抑えることができる。さらに、調整ねじ１２０のガイド部１２７と支持部材１００の摺動部１０５は、コイルバネ４４内に設置される構成のため、弁室２４の形状や入口ポート２０（小径穴２０ａ）の位置に関わらず、振動防止の構成を構築することが可能である。 The support member 100 is guided so as to move in the opening/closing direction (vertical direction) of the valve body 40 by the configuration in which the guide portion 127 of the adjusting screw 120 and the sliding portion 105 of the support member 100 are fitted. With this configuration, movement of the support member 100 and the valve body 40 in a direction other than the opening/closing direction (lateral direction) is restricted with respect to pressure fluctuations of the high-pressure refrigerant from the inlet port 20, thereby preventing lateral vibration. It is possible to suppress the generation of abnormal noise. Further, since the guide portion 127 of the adjusting screw 120 and the sliding portion 105 of the support member 100 are installed inside the coil spring 44, regardless of the shape of the valve chamber 24 or the position of the inlet port 20 (small diameter hole 20a). It is possible to build a vibration-proof structure.

また、支持部材１００の摺動部１０５の円筒内と調整ねじ１２０のガイド部１２７の上端部１２７ｂで形成された内部空間１５０は、支持部材１００の摺動により外部の弁室２４と圧力差が生じる可能性がある。しかし、ガイド部１２７に形成された溝１２８が均圧通路となり、弁室２４と内部空間１５０を連通して冷媒が行き来できるので、この圧力差が生じず支持部材１００及び弁体４０の動きに影響を与えない。また、調整ねじ１２０のガイド部１２７と支持部材１００の摺動部１０５は、摺動抵抗が少なく構成できるので摩耗による影響が少なく、これらの部材の材料の選択の幅が広がる。また、防振部材６２と組み合わせることで、上下方向の振動に対しても防振することが可能である。 The internal space 150 formed by the inside of the cylinder of the sliding portion 105 of the supporting member 100 and the upper end 127b of the guide portion 127 of the adjusting screw 120 has a pressure difference with the external valve chamber 24 due to the sliding of the supporting member 100. Can occur. However, since the groove 128 formed in the guide portion 127 serves as a pressure equalizing passage and allows the refrigerant to communicate between the valve chamber 24 and the internal space 150, the pressure difference does not occur and the movement of the support member 100 and the valve body 40 does not occur. It has no effect. Further, since the guide portion 127 of the adjusting screw 120 and the sliding portion 105 of the supporting member 100 can be configured to have a small sliding resistance, the influence of abrasion is small, and the range of selection of materials for these members is widened. Further, by combining with the vibration isolating member 62, it is also possible to perform vibration isolation against vertical vibration.

なお、均圧通路として調整ねじ１２０のガイド部１２７に設けられた溝１２８を説明したが、これ以外に支持部材１００の摺動部１０５の円筒に設けられた孔により弁室２４と内部空間１５０を連通する構成でもよい。この孔の場合、摺動部１０５とガイド部１２７との間の摺動面を減少させることなく均圧通路を構成できる。また、これらの溝１２８と孔を組み合わせて、均圧性を高めてもよい。 Although the groove 128 provided in the guide portion 127 of the adjusting screw 120 has been described as the pressure equalizing passage, the valve chamber 24 and the internal space 150 are formed by the holes provided in the cylinder of the sliding portion 105 of the supporting member 100 in addition to the groove 128. It may be configured to communicate with each other. In the case of this hole, the pressure equalizing passage can be formed without reducing the sliding surface between the sliding portion 105 and the guide portion 127. Further, the groove 128 and the hole may be combined to enhance the pressure equalizing property.

＜第２実施例＞
図４は、第２実施例の膨張弁の要部の縦断面図である。図５は、第２実施例の膨張弁の要部の分解斜視図である。第２実施例は、第１実施例の支持部材１００、調整ねじ１２０を、それぞれ、支持部材２００、調整ねじ２２０に置き換えた構成であり、それ以外は第１実施例（図１〜３）で示したものと共通であるので、共通の箇所は再度の説明を省略してある。 <Second embodiment>
FIG. 4 is a vertical cross-sectional view of the main part of the expansion valve of the second embodiment. FIG. 5 is an exploded perspective view of essential parts of the expansion valve of the second embodiment. The second embodiment has a configuration in which the support member 100 and the adjusting screw 120 of the first embodiment are replaced with a supporting member 200 and an adjusting screw 220, respectively, and otherwise the first embodiment (FIGS. 1 to 3). Since it is the same as the one shown, the description of the common parts is omitted.

支持部材２００は、弁体４０を支持する部材であり、弁体４０が支持部材２００に固定されている構成でもよい。支持部材２００は、本体部１０３、上面１０１、フランジ部１０２、摺動部２０５を有しており、本体部１０３、上面１０１、フランジ部１０２は上述した実施例１の支持部材１００と同様である。 The support member 200 is a member that supports the valve body 40, and the valve body 40 may be fixed to the support member 200. The support member 200 has a main body 103, an upper surface 101, a flange portion 102, and a sliding portion 205, and the main body 103, the upper surface 101, and the flange portion 102 are the same as the support member 100 of the first embodiment described above. ..

摺動部２０５は、本体部１０３の下部に設けられ、下側へ延びる円柱形状となっている。摺動部２０５の外径は本体部１０３の外径よりも小さく、コイルバネ４４の内径内で、調整ねじ２２０のガイド部２２７に入る大きさとなっている。さらに、摺動部２０５には、上下方向全域に渡って、外周部２０５ａの一部を切り欠いた状態で形成される溝２０６が形成されている。 The sliding portion 205 is provided in the lower portion of the main body 103 and has a columnar shape extending downward. The outer diameter of the sliding portion 205 is smaller than the outer diameter of the main body portion 103, and is sized to enter the guide portion 227 of the adjusting screw 220 within the inner diameter of the coil spring 44. Further, the sliding portion 205 is formed with a groove 206 formed by cutting out a part of the outer peripheral portion 205a over the entire area in the vertical direction.

調整ねじ２２０は、本体部１２１、六角穴１２２、挿入部１２３、先端部１２４、凹部２２５、ガイド部２２７を有しており、本体部１２１、六角穴１２２、挿入部１２３、先端部１２４は、上述した実施例１の調整ねじ１２０と同様である。調整ねじ２２０の上部には、上部が開口して円筒状の空間を有する凹部２２５が設けられている。凹部２２５は本体部１２１近辺まで達する深さに形成されている。 The adjusting screw 220 has a main body portion 121, a hexagonal hole 122, an insertion portion 123, a tip portion 124, a concave portion 225, and a guide portion 227. The main body portion 121, the hexagonal hole 122, the insertion portion 123, and the tip portion 124 are This is the same as the adjusting screw 120 of the first embodiment described above. A recess 225 having a cylindrical space with an open top is provided at the top of the adjusting screw 220. The recess 225 is formed to a depth reaching the vicinity of the main body 121.

さらに、凹部２２５の底部２２６の中心付近から上方向に延び、上部が開口する円筒状のガイド部２２７が形成されている。ガイド部２２７は、コイルバネ４４の内径よりも小さい外径と、支持部材２００の摺動部２０５を挿入するための内径を有している。また、支持部材２００の摺動のために必要な長さを有している。また、ガイド部２２７の途中には円筒内部と外部を連通する孔２２８が形成されている。孔２２８の形成位置は、摺動範囲の最下部における摺動部２０５の下端部２０５ｂよりも下側が望ましい。なお、調整ねじ２２０の弁本体１１への取り付けは、上述した実施例１の調整ねじ１２０と同様である。 Further, a cylindrical guide portion 227 is formed which extends upward from the vicinity of the center of the bottom portion 226 of the concave portion 225 and has an open top. The guide portion 227 has an outer diameter smaller than the inner diameter of the coil spring 44 and an inner diameter for inserting the sliding portion 205 of the support member 200. Further, it has a length necessary for sliding the support member 200. In addition, a hole 228 is formed in the middle of the guide portion 227 to connect the inside and the outside of the cylinder. The formation position of the hole 228 is preferably lower than the lower end portion 205b of the sliding portion 205 at the lowermost portion of the sliding range. The adjustment screw 220 is attached to the valve body 11 in the same manner as the adjustment screw 120 of the first embodiment described above.

支持部材２００の調整ねじ２２０への装着は、調整ねじ２２０の凹部２２５にコイルバネ４４を挿入して、上部から支持部材２００を装着する。このとき、コイルバネ４４の内径内では、調整ねじ２２０のガイド部２２７と支持部材２００の摺動部２０５が存在し、調整ねじ２２０のガイド部２２７に、支持部材２００の摺動部２０５が挿入される。この挿入による上下方向の両者の嵌合距離Ｃは、弁体４０が弁座２５に当接する最上部に位置する場合においても、支持部材２００の横方向のずれを発生させない嵌合距離（最少嵌合距離）を保つように設定される。また、摺動部２０５の上下方向の長さＤは、支持部材２００が摺動に必要な範囲（摺動範囲）を動けて、かつ、少なくとも最少嵌合距離を保つようにするため、摺動範囲に最少嵌合距離を足した距離以上になるように設定される。最少嵌合距離に摺動範囲を足した距離以上になるように設定される。また、嵌合は、ガイド部２２７の内周部２２７ａと摺動部２０５の外周部２０５ａにより行われ、これらの間のクリアランスは、抵抗が少なく支持部材２００が上下方向に移動できるクリアランスで設定される。 To mount the supporting member 200 on the adjusting screw 220, the coil spring 44 is inserted into the recess 225 of the adjusting screw 220, and the supporting member 200 is mounted from above. At this time, the guide portion 227 of the adjusting screw 220 and the sliding portion 205 of the supporting member 200 exist within the inner diameter of the coil spring 44, and the sliding portion 205 of the supporting member 200 is inserted into the guide portion 227 of the adjusting screw 220. It The vertical fitting distance C due to this insertion does not cause lateral displacement of the support member 200 (minimum fitting) even when the valve body 40 is located at the uppermost portion where it abuts the valve seat 25. It is set so as to keep the distance. Further, the vertical length D of the sliding portion 205 is set so that the supporting member 200 can move within a range required for sliding (sliding range) and at least maintain a minimum fitting distance. It is set to be equal to or greater than the distance obtained by adding the minimum fitting distance to the range. It is set to be more than the minimum fitting distance plus the sliding range. The fitting is performed by the inner peripheral portion 227a of the guide portion 227 and the outer peripheral portion 205a of the sliding portion 205, and the clearance between them is set to a clearance that allows the support member 200 to move in the vertical direction with low resistance. It

第２実施例では、調整ねじ２２０のガイド部２２７に支持部材２００の摺動部２０５を挿入して嵌合する構成により第１実施例と同様の効果を有する。また、ガイド部２２７が摺動部２０５よりも外側に構成しているため、ガイド部２２７の外径をコイルバネ４４の内径に合わせて設置可能であり、コイルバネ４４の位置決めをより確実に行うこともできる。 The second embodiment has the same effect as that of the first embodiment due to the configuration in which the sliding portion 205 of the support member 200 is inserted and fitted into the guide portion 227 of the adjusting screw 220. In addition, since the guide portion 227 is formed outside the sliding portion 205, the outer diameter of the guide portion 227 can be set so as to match the inner diameter of the coil spring 44, and the coil spring 44 can be positioned more reliably. it can.

なお、均圧通路として、摺動部２０５に形成された溝２０６及びガイド部２２７に形成された孔２２８を説明したが、これらのうちいずれかを用いてもよい。なお、これら２つを組み合わせることで均圧性を高めることができる。 Although the groove 206 formed in the sliding portion 205 and the hole 228 formed in the guide portion 227 have been described as the pressure equalizing passages, any of these may be used. The pressure equalizing property can be improved by combining these two.

以上の様に、本発明の実施形態について第１実施例、第２実施例を示してきたが、本発明は上記した実施例に限定されるものではなく、様々な変形例が含まれる。例えば、上記した実施例に設けられた全ての構成（構造）を備えるものに限定されるものではない。また、ある実施例の構成の一部を削除したり、他の実施例の構成に置き換えたり、あるいはまた、ある実施例の構成に他の実施例の構成を加えることも可能である。 As described above, although the first embodiment and the second embodiment have been shown with respect to the embodiment of the present invention, the present invention is not limited to the above-mentioned embodiments and includes various modifications. For example, the present invention is not limited to the one having all the configurations (structures) provided in the above-mentioned embodiments. It is also possible to delete a part of the configuration of a certain embodiment, replace it with the configuration of another embodiment, or add the configuration of another embodiment to the configuration of a certain embodiment.

例えば、上記実施例で示したパワーエレメント７０は、ねじによる取り付けを示しているが、これ以外に、弁本体上部に形成された円筒部を設け、この円筒部の内側にパワーエレメント７０を挿入し、該円筒部を内側カシメ加工することにより、該パワーエレメント７０を取り付ける構成でも良い。 For example, the power element 70 shown in the above embodiment is shown to be attached by screws, but in addition to this, a cylindrical portion formed on the upper part of the valve body is provided, and the power element 70 is inserted inside the cylindrical portion. The power element 70 may be attached by caulking the cylindrical portion inside.

１０ 膨張弁
１１ 弁本体
１１ａ 雌ねじ穴
２０ 入口ポート
２０ａ 小径穴
２４ 弁室
２５ 弁座
２６ 弁孔
２８ 出口ポート
３０ 戻り通路
３２ 開口
３３ 穴部
４０ 弁体
４４ コイルバネ
６０ 弁棒
６２ 防振部材
７０ パワーエレメント
１００、２００ 支持部材
１０５、２０５ 摺動部
１２０、２２０ 調整ねじ
１２７、２２７ ガイド部
１２８、２０６ 溝
１５０、２５０ 内部空間
２２８ 孔
10 expansion valve 11 valve body 11a female screw hole 20 inlet port 20a small diameter hole 24 valve chamber 25 valve seat 26 valve hole 28 outlet port 30 return passage 32 opening 33 hole 40 valve element 44 coil spring 60 valve rod 62 vibration damping member 70 power element 100, 200 Support member 105, 205 Sliding part 120, 220 Adjustment screw 127, 227 Guide part 128, 206 Groove 150, 250 Internal space 228 Hole

Claims (4)

冷媒が流入する入口ポートと冷媒が流出する出口ポートとを連通する弁孔を備えた弁本体と、
前記弁孔を流れる冷媒の量を調節する弁体と、
前記弁本体に取り付けられて弁棒を介して前記弁体を駆動するパワーエレメントと、
前記弁体を支持する支持部材と、
前記支持部材を介して前記弁体を閉弁方向に押圧するコイルバネと、
ガイド部を有するとともに前記弁本体に螺合され前記コイルバネの押圧力を調整する調整ねじと、を備え、
前記支持部材は、摺動部を有し、
前記ガイド部は前記摺動部へ摺動自在に挿入されて横方向のずれを発生させない嵌合距離を保ちながら前記支持部材の前記弁体の開閉方向以外の方向の動きを規制し、
前記ガイド部の外周に前記弁体の開閉方向に延びる溝を形成して、前記摺動部と前記ガイド部で形成される内部空間とその外側とを連通する均圧通路とする膨張弁。 A valve main body having a valve hole that communicates an inlet port into which the refrigerant flows and an outlet port from which the refrigerant flows,
A valve body for adjusting the amount of refrigerant flowing through the valve hole,
A power element attached to the valve body to drive the valve body via a valve rod;
A support member for supporting the valve body,
A coil spring for pressing the valve element in the valve closing direction via the support member,
An adjusting screw that has a guide portion and is screwed into the valve body to adjust the pressing force of the coil spring;
Wherein the support member has a sliding portion,
The guide portion is slidably inserted into the sliding portion and regulates the movement of the support member in a direction other than the opening/closing direction of the valve body while maintaining a fitting distance that does not cause lateral displacement.
An expansion valve in which a groove extending in the opening/closing direction of the valve body is formed on the outer periphery of the guide portion to form a pressure equalizing passage that communicates the internal space formed by the sliding portion and the guide portion with the outside thereof . 前記摺動部に、前記内部空間とその外側とを連通する孔を形成して均圧通路とする、
請求項１に記載の膨張弁。 A hole for communicating the internal space and the outside thereof is formed in the sliding portion to form a pressure equalizing passage,
The expansion valve according to claim 1. 冷媒が流入する入口ポートと冷媒が流出する出口ポートとを連通する弁孔を備えた弁本体と、
前記弁孔を流れる冷媒の量を調節する弁体と、
前記弁本体に取り付けられて弁棒を介して前記弁体を駆動するパワーエレメントと、
前記弁体を支持する支持部材と、
前記支持部材を介して前記弁体を閉弁方向に押圧するコイルバネと、
前記弁体方向へ延び前記コイルバネの内径に入る大きさのガイド部を有するとともに前記弁本体に螺合され前記コイルバネの押圧力を調整する調整ねじと、を備え、
前記支持部材は、摺動部を有し、
前記摺動部は前記ガイド部へ摺動自在に挿入されて横方向のずれを発生させない嵌合距離を保ちながら前記支持部材の前記弁体の開閉方向以外の方向の動きを規制し、
前記摺動部の外周に前記弁体の開閉方向に延びる溝を形成して、前記摺動部と前記ガイド部で形成される内部空間とその外側とを連通する均圧通路とする膨張弁。 A valve main body having a valve hole that communicates an inlet port into which the refrigerant flows and an outlet port from which the refrigerant flows,
A valve body for adjusting the amount of refrigerant flowing through the valve hole,
A power element attached to the valve body to drive the valve body via a valve rod;
A support member for supporting the valve body,
A coil spring for pressing the valve element in the valve closing direction via the support member,
An adjusting screw that has a guide portion having a size that extends in the valve body direction and that enters the inner diameter of the coil spring, and that is screwed into the valve body and that adjusts the pressing force of the coil spring;
The support member has a sliding portion,
The sliding portion is slidably inserted into the guide portion and regulates the movement of the support member in a direction other than the opening/closing direction of the valve body while maintaining a fitting distance that does not cause a lateral displacement.
An expansion valve in which a groove extending in the opening/closing direction of the valve body is formed on the outer periphery of the sliding portion to form a pressure equalizing passage that communicates the internal space formed by the sliding portion and the guide portion with the outside thereof . 前記ガイド部に、前記内部空間とその外側とを連通する孔を形成して均圧通路とする、
請求項３に記載の膨張弁。 In the guide portion, a hole that communicates the internal space and the outside thereof is formed to form a pressure equalizing passage,
The expansion valve according to claim 3 .
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