JP6018807B2 - Expansion valve - Google Patents

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JP6018807B2
JP6018807B2 JP2012132783A JP2012132783A JP6018807B2 JP 6018807 B2 JP6018807 B2 JP 6018807B2 JP 2012132783 A JP2012132783 A JP 2012132783A JP 2012132783 A JP2012132783 A JP 2012132783A JP 6018807 B2 JP6018807 B2 JP 6018807B2
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valve
refrigerant
passage
pressure
coil spring
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JP2013257064A (en
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靖 井上
靖 井上
武志 齊藤
武志 齊藤
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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膨張弁に関する。   The present invention relates to an expansion valve used in a refrigeration cycle.

冷凍サイクルに用いられる膨張弁の弁本体は、圧縮機からの高圧の冷媒が導入される入口通路と、入口通路に連通する弁室と、弁室に連通するオリフィスとを有する。
弁室内には、オリフィスの入口に形成された弁座に対向する弁体と、弁体を弁座に向けて付勢するコイルばね等が配設される。弁体と弁座の間に形成される隙間を通過した冷媒はオリフィスで減圧されて、出口通路から蒸発器へ送り出される。
弁本体は、蒸発器から圧縮機へ戻る低圧の冷媒が通過する低圧冷媒通路を有する。低圧冷媒の圧力と温度は、弁本体の頂部に配設された弁体の駆動装置であるパワーエレメントに伝達される。
パワーエレメントは、低圧冷媒から受けとる情報に対応して弁体を操作して弁開度を制御する。 The valve body of the expansion valve used in the refrigeration cycle has an inlet passage through which high-pressure refrigerant from the compressor is introduced, a valve chamber communicating with the inlet passage, and an orifice communicating with the valve chamber.
In the valve chamber, a valve body facing the valve seat formed at the inlet of the orifice, a coil spring for biasing the valve body toward the valve seat, and the like are disposed. The refrigerant that has passed through the gap formed between the valve body and the valve seat is depressurized by the orifice and sent out from the outlet passage to the evaporator.
The valve body has a low-pressure refrigerant passage through which low-pressure refrigerant returning from the evaporator to the compressor passes. The pressure and temperature of the low-pressure refrigerant are transmitted to a power element that is a drive device for the valve body disposed at the top of the valve body.
The power element controls the valve opening by operating the valve body in response to information received from the low-pressure refrigerant.

特開２００８−１８０４７６号公報JP 2008-180476 A

入口通路から弁室に導入される高圧の冷媒は、流れの向きを直角方向に変えて弁座に向かうが、その際、弁体を付勢するコイルばねに接する。これにより、弁室内の冷媒の流れが乱れやすくなるとともに、冷媒に含まれる気泡が潰れやすくなり、騒音の発生原因となる。
そこで、本発明の目的は、上述した不具合を解消する膨張弁を提供するものである。 The high-pressure refrigerant introduced into the valve chamber from the inlet passage changes the direction of flow to the valve seat while changing the flow direction to a right angle direction. At this time, the high-pressure refrigerant contacts the coil spring that urges the valve body. As a result, the flow of the refrigerant in the valve chamber is likely to be disturbed, and the bubbles contained in the refrigerant are liable to be crushed, causing noise.
Therefore, an object of the present invention is to provide an expansion valve that eliminates the above-described problems.

本発明は、高圧冷媒が導入される入口通路と、入口通路に連通する弁室と、弁室に連通するオリフィスと、弁室内に配設されてオリフィスの入口に形成された弁座に対向する弁体と、弁体を弁座に向けて付勢するコイルばねと、弁室内でコイルばねを支持するプラグと、オリフィスを通過した冷媒を蒸発器へ向けて送り出す出口通路と、蒸発器から圧縮機へ戻る低圧の冷媒が通過する低圧通路と、低圧通路の冷媒の圧力と温度に対応して弁体を駆動するパワーエレメントとを備える膨張弁であって、入口通路からオリフィスに向かう高圧冷媒がコイルばねに接するのを防止するべく、コイルばねの外周部を覆うとともに弁室の内周面との間に冷媒整流通路を形成するばねカバー部材を設け、ばねカバー部材は筒状の部材であって、その外周部が入口通路からの冷媒の流れに対して直交するように配置され、コイルばねの付勢方向において、ばねカバー部材とプラグとは重ならないことを特徴とする。 The present invention is directed to an inlet passage through which high-pressure refrigerant is introduced, a valve chamber communicating with the inlet passage, an orifice communicating with the valve chamber, and a valve seat disposed in the valve chamber and formed at the inlet of the orifice. A valve body, a coil spring that urges the valve body toward the valve seat, a plug that supports the coil spring in the valve chamber, an outlet passage that sends the refrigerant that has passed through the orifice toward the evaporator, and compression from the evaporator An expansion valve comprising a low-pressure passage through which low-pressure refrigerant returns to the machine and a power element that drives the valve body in response to the pressure and temperature of the refrigerant in the low-pressure passage. In order to prevent contact with the coil spring, a spring cover member that covers the outer peripheral portion of the coil spring and forms a refrigerant rectification passage between the inner periphery of the valve chamber is provided , and the spring cover member is a cylindrical member. Its outer periphery Is arranged perpendicular to the flow of refrigerant from the inlet passage, in the urging direction of the coil spring, characterized in that it does not overlap the spring cover member and the plug.

本発明の膨張弁は、上述した手段を備えることにより、弁室内を流れる冷媒の騒音を低減することができる。   The expansion valve of the present invention can reduce the noise of the refrigerant flowing in the valve chamber by including the above-described means.

本発明の一実施形態である膨張弁の正面側縦断面図。The front side longitudinal cross-sectional view of the expansion valve which is one Embodiment of this invention. 図１の膨張弁の左側縦断面図。The left longitudinal cross-sectional view of the expansion valve of FIG. 図１の膨張弁の横断面図であり、（ａ）は図１のＡ−Ａ’線断面図、（ｂ）は図２のＢ−Ｂ’線断面図、（ｃ）は図１のＣ−Ｃ’線断面図。2 is a cross-sectional view of the expansion valve of FIG. 1, where (a) is a cross-sectional view taken along the line AA ′ of FIG. 1, (b) is a cross-sectional view taken along the line BB ′ of FIG. -C 'sectional view taken on the line. 図１の要部拡大図。The principal part enlarged view of FIG.

図１〜３に示すように、本実施形態の膨張弁１は角柱状の弁本体１０を有し、弁本体１０の底部の近傍には高圧冷媒の入口通路２０が設けられる。入口通路２０は奥に向かって径が次第に小さくなる多段状に形成され、最奥部の小径部２２を介して弁室３０に連通している。弁室３０の上端はオリフィス４４に連通しており、その入口側には弁座４２が形成されている。   As shown in FIGS. 1 to 3, the expansion valve 1 of the present embodiment has a prismatic valve body 10, and an inlet passage 20 for high-pressure refrigerant is provided near the bottom of the valve body 10. The inlet passage 20 is formed in a multistage shape whose diameter gradually decreases toward the back, and communicates with the valve chamber 30 via the innermost small diameter portion 22. The upper end of the valve chamber 30 communicates with the orifice 44, and a valve seat 42 is formed on the inlet side.

弁室３０には弁体４０が配設され、弁体４０は弁座４２と協働して弁部を構成する。弁体４０と弁座４２の間に形成される隙間を通過した高圧の冷媒は、オリフィス４４を介して出口通路５０に流入し、配管（図示せず）を通って蒸発器へ送られる。入口通路２０と出口通路５０は、それらの軸線が直交するように形成されており、凝縮器から入口通路２０を介して弁本体１０内に流入する高圧冷媒は、弁本体１０内をＬ字状に流れ、出口通路５０を介して蒸発器へ送り込まれる。   A valve body 40 is disposed in the valve chamber 30, and the valve body 40 forms a valve portion in cooperation with the valve seat 42. The high-pressure refrigerant that has passed through the gap formed between the valve body 40 and the valve seat 42 flows into the outlet passage 50 through the orifice 44 and is sent to the evaporator through a pipe (not shown). The inlet passage 20 and the outlet passage 50 are formed so that their axes are orthogonal to each other, and the high-pressure refrigerant flowing from the condenser into the valve body 10 via the inlet passage 20 is formed in an L shape in the valve body 10. To the evaporator via the outlet passage 50.

弁体４０は弁室３０内に配設される弁支持部材６０により支持され、弁支持部材６０はコイルばね６２により閉弁方向に常時付勢されている。コイルばね６２は弁室３０の下端開口部を封止するプラグ６４により支持され、プラグ６４のねじ込み量を調節することにより、コイルばね６２の圧縮量を変更して弁体４０への閉弁方向の付勢力を調整する。また、プラグ６４の上端外周部に装着されたシールリング６６により弁室３０がシールされる。   The valve body 40 is supported by a valve support member 60 disposed in the valve chamber 30, and the valve support member 60 is always urged in the valve closing direction by a coil spring 62. The coil spring 62 is supported by a plug 64 that seals the lower end opening of the valve chamber 30, and by adjusting the screwing amount of the plug 64, the compression amount of the coil spring 62 is changed and the valve closing direction to the valve body 40 is changed. Adjust the urging force. Further, the valve chamber 30 is sealed by a seal ring 66 attached to the outer periphery of the upper end of the plug 64.

コイルばね６２の外側には、コイルばね６２を覆うばねカバー部材１００が配設されている。ばねカバー部材１００は金属製の板材をプレス加工して形成される円筒形状の部材であって、その外径寸法は弁室３０の内径寸法より小さな寸法になっており、ばねカバー部材１００の外周面と弁室３０の内周面との間には環状の間隙からなる冷媒整流通路Ｇ１が形成されている。ばねカバー部材１００の下端部１０２は小径部２２の最下部よりもプラグ６４側に延びており、ばねカバー部材１００の外周面は小径部２２の弁室３０への開口部の全面に対向している。 A spring cover member 100 that covers the coil spring 62 is disposed outside the coil spring 62. The spring cover member 100 is a cylindrical member formed by pressing a metal plate, and the outer diameter of the spring cover member 100 is smaller than the inner diameter of the valve chamber 30. Between the surface and the inner peripheral surface of the valve chamber 30, a refrigerant rectifying passage G <b> 1 having an annular gap is formed. The lower end portion 102 of the spring cover member 100 extends to the plug 64 side from the lowermost portion of the small diameter portion 22, and the outer peripheral surface of the spring cover member 100 faces the entire opening portion of the small diameter portion 22 to the valve chamber 30. Yes.

蒸発器から圧縮機へ戻る低圧の冷媒は、弁本体１０の上部に設けられる低圧冷媒の入口ポート７０に入り、出口ポート７２を介して圧縮機へ戻る。図３（ｃ）に示すように、入口ポート７０と出口ポート７２は、それらの軸線が直交するように形成されており、蒸発器から入口ポート７０を介して弁本体１０内に流入する低圧冷媒は、弁本体１０内をＬ字状に流れ、出口ポート７２を介して圧縮機へ戻る。   The low-pressure refrigerant returning from the evaporator to the compressor enters the low-pressure refrigerant inlet port 70 provided in the upper part of the valve body 10 and returns to the compressor via the outlet port 72. As shown in FIG. 3C, the inlet port 70 and the outlet port 72 are formed so that their axes are orthogonal to each other, and the low-pressure refrigerant that flows into the valve body 10 from the evaporator via the inlet port 70. Flows in an L-shape in the valve body 10 and returns to the compressor via the outlet port 72.

図１に示すように、弁本体１０の頂部にはパワーエレメント８０が装備される。パワーエレメント８０は上蓋８１と下蓋８２の間に挟み込まれるダイアフラム８３を有し、上蓋８１とダイアフラム８３の間には上部圧力作動室８４が形成される。
上部圧力作動室８４内には作動ガスが封入され、下部圧力作動室８５に導入される低圧冷媒の圧力、温度に応じてダイアフラム８３が変位する。
パワーエレメント８０はカバー８８で覆われ、作動ガスへの外部の温度の影響を防止する。 As shown in FIG. 1, a power element 80 is mounted on the top of the valve body 10. The power element 80 has a diaphragm 83 sandwiched between an upper lid 81 and a lower lid 82, and an upper pressure working chamber 84 is formed between the upper lid 81 and the diaphragm 83.
A working gas is sealed in the upper pressure working chamber 84, and the diaphragm 83 is displaced according to the pressure and temperature of the low-pressure refrigerant introduced into the lower pressure working chamber 85.
The power element 80 is covered with a cover 88 to prevent the influence of external temperature on the working gas.

ダイアフラム８３の変位は、受け部材９０を介して作動棒９２に伝達され、作動棒９２は弁体４０を駆動して弁開度を制御する。
作動棒９２は、弁本体１０に形成された凹部１０ａ内に装着されたリング状の防振バネ部材９３により弾性支持されている。この防振バネ部材９３は作動棒９２に外嵌され、作動棒９２の軸方向の移動を許容しつつ径方向の移動を抑制する。これにより、高圧冷媒の圧力変動に伴う騒音の発生が防止される。 The displacement of the diaphragm 83 is transmitted to the operating rod 92 via the receiving member 90, and the operating rod 92 drives the valve body 40 to control the valve opening.
The operating rod 92 is elastically supported by a ring-shaped vibration-proof spring member 93 mounted in a recess 10 a formed in the valve body 10. The anti-vibration spring member 93 is fitted on the operating rod 92 and suppresses the radial movement while allowing the axial movement of the operating rod 92. Thereby, generation | occurrence | production of the noise accompanying the pressure fluctuation of a high pressure refrigerant | coolant is prevented.

図４において、入口通路２０に導入された高圧冷媒は、小径部２２を通って弁室３０内に流入する。そして、ばねカバー部材１００の外周面に接し、平滑な表面をもつばねカバー部材１００の外周面と弁室３０の内周面とにより形成される冷媒整流通路Ｇ１に案内されてオリフィス４４へ向かう。平滑面であるカバー部材１００の外周面と平滑面である弁室３０の内周面とで形成される冷媒整流通路Ｇ１を通る冷媒は整流されるので、乱流となることはない。また、高圧冷媒に含まれる気泡は冷媒整流通路Ｇ１で細分化される。この作用により、高圧冷媒により弁室３０内で発生する騒音が低減する。 In FIG. 4, the high-pressure refrigerant introduced into the inlet passage 20 flows into the valve chamber 30 through the small diameter portion 22. Then, it is guided to the refrigerant rectifying passage G 1 formed by the outer peripheral surface of the spring cover member 100 having a smooth surface and the inner peripheral surface of the valve chamber 30 in contact with the outer peripheral surface of the spring cover member 100 and heading toward the orifice 44. . Since the refrigerant passing through the refrigerant rectifying passage G 1 is formed between the inner circumferential surface of the outer peripheral surface and the valve chamber 30 is a smooth surface of the cover member 100 is a smooth surface is rectified, not become turbulent. Moreover, air bubbles contained in the high-pressure refrigerant is subdivided by the refrigerant rectifying passage G 1. This action reduces noise generated in the valve chamber 30 by the high-pressure refrigerant.

本発明の膨張弁は、以上のように、高圧冷媒が流入する弁室３０内に、コイルばね６２を覆うとともに弁室３０の内周面との間に冷媒整流通路Ｇ１を形成するばねカバー部材１００を配設したので、冷媒の流れはスムーズとなって乱流が発生せず、気泡が細分化されるので、騒音が低減する。 Expansion valve of the present invention, as described above, the spring cover forming a valve chamber 30 which flows high-pressure refrigerant, the refrigerant rectifying passage G 1 between the inner peripheral surface of the valve chamber 30 covers the coil spring 62 Since the member 100 is provided, the flow of the refrigerant is smooth, turbulence is not generated, and the bubbles are subdivided, so that noise is reduced.

１ 膨張弁
１０ 弁本体
２０ 入口通路
２２ 小径部
３０ 弁室
４０ 弁体
４２ 弁座
４４ オリフィス
５０ 出口通路
６０ 弁支持部材
６２ コイルばね
６４ プラグ
６６ シールリング
７０ 入口ポート
７２ 出口ポート
８０ パワーエレメント
８１ 上蓋
８２ 下蓋
８３ ダイアフラム
８４ 上部圧力作動室
８５ 下部圧力作動室
９０ 受け部材
９２ 作動棒
１００ ばねカバー部材
Ｇ１ 冷媒整流通路 DESCRIPTION OF SYMBOLS 1 Expansion valve 10 Valve main body 20 Inlet passage 22 Small diameter part 30 Valve chamber 40 Valve body 42 Valve seat 44 Orifice 50 Outlet passage 60 Valve support member 62 Coil spring 64 Plug 66 Seal ring 70 Inlet port 72 Outlet port 80 Power element 81 Upper lid 82 Lower lid 83 Diaphragm 84 Upper pressure working chamber 85 Lower pressure working chamber 90 Receiving member 92 Actuating rod 100 Spring cover member G 1 Refrigerant rectifying passage

Claims (1)

高圧冷媒が導入される入口通路と、該入口通路に連通する弁室と、該弁室に連通するオリフィスと、前記弁室内に配設されて前記オリフィスの入口に形成された弁座に対向する弁体と、該弁体を前記弁座に向けて付勢するコイルばねと、前記弁室内で前記コイルばねを支持するプラグと、前記オリフィスを通過した冷媒を蒸発器へ向けて送り出す出口通路と、蒸発器から圧縮機へ戻る低圧の冷媒が通過する低圧通路と、該低圧通路の冷媒の圧力と温度に対応して前記弁体を駆動するパワーエレメントとを備える膨張弁であって、
前記入口通路から前記オリフィスに向かう高圧冷媒が前記コイルばねに接するのを防止するべく、前記コイルばねの外周部を覆うとともに前記弁室の内周面との間に冷媒整流通路を形成するばねカバー部材を設け、
前記ばねカバー部材は筒状の部材であって、その外周部が前記入口通路からの冷媒の流れに対して直交するように配置され、
前記コイルばねの付勢方向において、前記ばねカバー部材と前記プラグとは重ならないことを特徴とする膨張弁。 An inlet passage through which high-pressure refrigerant is introduced, a valve chamber communicating with the inlet passage, an orifice communicating with the valve chamber, and a valve seat disposed in the valve chamber and formed at the inlet of the orifice A valve body, a coil spring that urges the valve body toward the valve seat, a plug that supports the coil spring in the valve chamber, and an outlet passage that sends the refrigerant that has passed through the orifice toward the evaporator An expansion valve comprising a low-pressure passage through which a low-pressure refrigerant returning from the evaporator to the compressor passes, and a power element that drives the valve body in response to the pressure and temperature of the refrigerant in the low-pressure passage,
A spring cover that covers the outer peripheral portion of the coil spring and forms a refrigerant rectifying passage with the inner peripheral surface of the valve chamber in order to prevent high-pressure refrigerant from the inlet passage toward the orifice from coming into contact with the coil spring. A member ,
The spring cover member is a cylindrical member, and the outer periphery thereof is arranged so as to be orthogonal to the refrigerant flow from the inlet passage,
The expansion valve according to claim 1 , wherein the spring cover member and the plug do not overlap in the biasing direction of the coil spring .
JP2012132783A 2012-06-12 2012-06-12 Expansion valve Active JP6018807B2 (en)

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KR101735181B1 (en) 2015-05-14 2017-05-15 학교법인 두원학원 Expansion valve for an air-conditioner of a vehicle
JP6779030B2 (en) * 2016-04-27 2020-11-04 株式会社不二工機 Expansion valve
JP6943379B2 (en) * 2016-08-09 2021-09-29 株式会社不二工機 Expansion valve
JP2019158296A (en) * 2018-03-16 2019-09-19 株式会社不二工機 Expansion valve
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US4542852A (en) * 1984-03-05 1985-09-24 The Singer Company Vibration damping device for thermostatic expansion valves
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JPH0367968U (en) * 1989-10-31 1991-07-03
JP2008180476A (en) * 2007-01-26 2008-08-07 Fuji Koki Corp Expansion valve
JP2010014369A (en) * 2008-07-04 2010-01-21 Denso Corp Expansion valve
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