JP3793820B2

JP3793820B2 - Constant flow valve with water temperature compensation function

Info

Publication number: JP3793820B2
Application number: JP04161497A
Authority: JP
Inventors: 文紀木村; 晃裕三浦
Original assignee: パロマ工業株式会社
Priority date: 1997-02-10
Filing date: 1997-02-10
Publication date: 2006-07-05
Anticipated expiration: 2017-02-10
Also published as: JPH10220610A

Description

【０００１】
【産業上の利用分野】
本発明は、給湯器の定流量弁に関し、詳しくは水温補正機能を備えた給湯器の定流量弁に関する。
【０００２】
【従来の技術】
従来より、水温補正機能を備えた定流量弁が知られている。
例えば、特開昭６３−３０３２８１号公報に示されるように、給湯器では、供給水圧の変動があっても通水量を変化させないガバナ機能と、水温変化に応じて通水量を増減する水温補正機能とを併せもつ定流量弁を給水路へ組み込み、給湯温度に対して供給水圧および入水温度の変動による出湯温度への影響を防いでいる。
しかし、水温補正機能付きの定流量弁（以下、定流量弁という。）は形状記憶合金を用いることもあって、高価なものになってしまうという問題がある。
そこで、定流量弁の主要部品を樹脂化することに着目して、加工工数を削減してコスト低減を図り、水温補正機能付きの定流量弁を安価に製作できるようにしている。
また、樹脂化によって、定流量弁の軽量化を図っている。
【０００３】
【発明が解決しようとする課題】
しかしながら、樹脂成型では、樹脂金型の合せ面にバリが発生し、特に、定流量弁における重要な弁の周囲にバリが発生した場合には、弁がバリを噛み込んだり、バリに引っ掛かったりして、弁が中心軸に対して傾き、水量の制御が適切に行われないという新たな問題が生じる。
例えば、図４に示す水温補正機能付きの定流量弁Ｖでは、弁が接離する上段シート部２ａを樹脂成型する樹脂金型と、通水路を形成する通孔３を樹脂成型する樹脂金型とで、樹脂成型の際に、樹脂金型の抜き方向が異なる。
そして、上段シート部２ａの下端に、これらの樹脂金型の合せ目ができるため、この境界にバリが発生し易くなる。
その結果、弁である上弁部９ａと上段シート部２ａ間に、このバリが噛み込まれると、流量を制御できない問題が生じる。
【０００４】
また、流路の開度を制御する可動弁体Ｖ３２は、開弁方向に付勢されるガバナばね３２の傾きによって、傾きが左右され、ガバナ特性を安定させるためには、傾きの小さいガバナばね３２を用いる必要があって、高価なものとなっていた。
【０００５】
また、可動弁体Ｖ３２は、ガバナばね３２によって、固定弁体Ｖ３１から開弁方向に付勢されるため、Ｃ型またはリング状の止め金具３０によって係止され、固定弁体Ｖ３１からの飛出しが防止される。
しかし、固定弁体Ｖ３１における止め金具３０の装着箇所の加工（装着箇所は、アンダーカット形状になっており樹脂成型ができないため、切削加工をしなければならない。）が難しい上、止め金具３０の固定弁体Ｖ３１への組み込みに際して、専用の組み込み治具を用いなければならないという問題があった。
【０００６】
そこで、本発明の水温補正機能付きの定流量弁は上記課題を解決し、樹脂化に伴う問題点を解消し、複雑な形状を簡単に成型できる樹脂成型の利点を利用しつつ、安価に定流量弁を製作できるようにすると共に、従前のガバナ性能を確保することを目的とする。
【０００７】
【課題を解決するための手段】
上記課題を解決する本発明の請求項１記載の水温補正機能付き定流量弁は、
給水路に固定され、上段シート部と下段シート部とを円筒内面に有する固定弁体と、
上記固定弁体内と同軸上に進退自在に挿入され、上記固定弁体の上記上段シート部と下段シート部とに各々接離する上弁および下弁を有すると共に、給水が通過する孔が開けられ、上記孔前後の差圧力を受圧する差圧板を備えた可動弁体と、
水温変化に応じてばね定数が変化する感熱応動部材で形成され、上記可動弁体を開弁方向に付勢するガバナばねとを備え、
上記ガバナばねの荷重と上記差圧板に働く差圧力とが均衡して、流量を一定に制御する水温補正機能付き定流量弁において、
上段シート部が別体に設けられ、固定弁体に固定するねじ部と、
上段シート部を延長して可動弁体の上弁を中心軸方向に導くガイド部とを形成したことを要旨とする。
【０００８】
また、本発明の請求項２記載の水温補正機能付き定流量弁は、請求項１記載の定流量弁において、
上記固定弁体の上流側の側面周囲に開口する係止孔と、
ばね線材を折り曲げて一辺の中央を切り欠いた略三角形状を形成し、上記係止孔にはめ込んで上記可動弁体の突び出しを防ぐ止めばねとを設けたことを要旨とする。
【０００９】
上記構成を有する本発明の請求項１記載の水温補正機能付き定流量弁は、上段シート部が固定弁体と別体に設けられ、ねじ部によって、固定弁体に固定される。
また、上段シート部を延長して形成されるガイド部は、可動弁体が閉弁するにつれて可動弁体の上弁を中心方向へ導く。
従って、樹脂成型する場合には、上段シート部と固定弁体とを別々に樹脂成型でき、樹脂成型が容易となって、上段シート部には、樹脂金型の合せ目に発生する成型上のバリが発生しない。
（固定弁体を上段シート部と共に一体に樹脂成型する場合には、上段シート部の端部が樹脂金型の合せ目になって、成型上のバリが発生し易い。）
また、上段シート部を別体にすることによって、可動弁体の上弁をガイドするガイド部を十分に大きく設けることができる。
そして、このガイド部は、可動弁体の閉弁方向への移動に伴って、可動弁体を中心方向に導く働きをする。
従って、固定弁体に対する可動弁体の傾きが矯正され、同心を保ち易くなってガバナ性能が向上する。
また、ガイド部が傾きを矯正するので、ガバナばねの傾きをある程度は許容でき、ガバナばねを安価に作製できる。
【００１０】
上記構成を有する本発明の請求項２記載の水温補正機能付き定流量弁は、ばね線材を折り曲げ、一辺の中央を切り欠いた略三角形状を形成する止めばねが、切り欠き方向にたわませられ、その３頂点を固定弁体の側面周囲の係止孔にはめ込まれて係止され、突び出す方向に付勢された可動弁体を受け止める。
従って、定流量弁として可動弁体の組み込みが容易となると共に、確実な抜け止めができる。また、組み込みに際して、専用治具を必要としない。
また、固定弁体を樹脂成型する場合には、係止孔を含めて一体に樹脂成型できるので、従前のようなリセス加工が必要でなくなる。
【００１１】
【発明の実施形態】
以上説明した本発明の構成・作用を一層明らかにするために、以下本発明の定流量弁の好適な実施例について説明する。
図１は一実施例としての定流量弁Ｖの概略図である。
Ｖ１は、円筒状の固定弁体で、内側には中心軸に対して傾斜するシート面を形成する下段シート部２ａを備える。
また、固定弁体Ｖ１の上部には、同様に、中心軸に対して傾斜するシート面である上弁シート部２ｂを形成する調節弁５が上述の下段シート部２ａと同軸となってねじ部６に固定される。
従って、調節弁５は、ねじ込み程度を調節されることにより、上弁シート部２ｂの位置を軸方向に調節する。
【００１２】
また、調節弁５に形成する上段シート部２ｂは、上流側に傾斜角度を保って部分的に下方に延長し、後述する可動弁体Ｖ２を確実に中心軸方向に導くようにガイド部１が設けられる。
固定弁体Ｖ１と調節弁５とは、別部品として樹脂成型され、調節弁５の上段シート部２ｂおよびガイド部１に樹脂成型上のバリが発生しないように、表面が滑らかに成型される。また、ガイド部１は、十分に大きく設けられる。
【００１３】
そして、固定弁体Ｖ１における円筒外周面には、上弁シート部２ｂと下段シート部２ａとの間に、複数の通孔３が設けられ、後述する可動弁体Ｖ２の下弁部９ａおよび上弁部９ｂを通過した通水を下流側に導いている。
この固定弁体Ｖ１の外周溝部１７には、流路の内壁面２１に当接してシールするＯリング７が装着され、流路の段部１８と止め輪８とに挟まれて固定弁体Ｖ１が流路に固定される。
【００１４】
固定弁体Ｖ１内に挿入されるＶ２は可動弁体で、固定弁体Ｖ１に設けられる下段シート部２ａ、および上弁シート部２ｂにそれぞれ接離する下弁部９ａ、および上弁部９ｂが上下に設けられ、上流部にはＵリングシール１１を外周に装着して固定弁体の内壁１０に摺動し、流路を上流側と下流側に仕切る差圧板４が一体に設けられる。
また、差圧板４には、軸中心を貫通する流路孔１２ａと、その周囲に複数の流路孔１２ｂが設けられ、差圧板４の上流側と固定弁体Ｖ１内の上部空間とを連通している。
また、差圧板４と下弁部９ａ間における可動弁体Ｖ２の外周側面には、複数の横孔１３が軸と直交して開けられ、流路孔１２ａに通じている。
【００１５】
Ｕリングシール１１は、ゴム材質の弾性体で作製され、容易に圧縮できるＵリング状に形成され、Ｕリング状の開口部を上流側に向けて差圧板４の外周に装着され、Ｕリング状の一辺の端部側面が内壁１０に当接してシールしつつ、摺動抵抗を少なくしている。
【００１６】
また、固定弁体Ｖ１に設けた調節弁５と可動弁体Ｖ２間に、ガバナばね１４を同軸上に配設し、可動弁体Ｖ２が調節弁５に対して離反する方向に付勢される。
そして、ガバナばね１４と差圧板４の前後に発生する差圧とガバナばね１４力とが均衡することによって、下弁部９ａと上弁部９ｂとを通過する流量が一定に制御される。
尚、固定弁体Ｖ１の上流側には挿入した可動弁体Ｖ２の突出を受け止める止めばね１５が設けられる。
また、ガバナばね１４は、水温変化に応じてばね定数が変化する感熱応動部材である形状記憶合金を用い、温度に対するばね荷重特性が実際の給湯温度と適切な比例関係となるように選定される。
【００１７】
固定弁体Ｖ１の上流側の端部から所定間隔離れた側面の周囲３ケ所には、係止孔１６が設けられる（図２）。
係止孔１６は、固定弁体Ｖ１が樹脂成型される際に、同時に形成される。
また、ばね線材を折り曲げて形成される止めばね１５が三角形の一辺の中央を切り欠いた略三角形状を形成し、その３頂点が固定弁体の側面の係止孔にはめ込まれる。
そして、止めばね１５は、可動弁体Ｖ２を受け止めてその突び出しを防止する。
また、止めばね１５のはめ込みは、切り欠き方向にたわませながら、三角形の頂点を係止孔１６にのぞませることによって、容易に装着できる。
従って、組み立てに際して、専用の治具が必要でなくなり、定流量弁の組み込みを容易に行うことができる。
【００１８】
尚、前述したＯリング７、止め輪８、Ｕリングシール１１、ガバナばね１４および止めばね１５以外の部品は、樹脂で成型されるものとする。
【００１９】
次に、水温補正機能について説明を加える。
この定流量弁Ｖは、入水温度の変化に応じてばね力が増減し、固定弁体Ｖ１と可動弁体Ｖ２とによる弁間隙を比例的に増減するので、入水温度の高低の変化により通水量が比例的に増減する。
例えば、夏期と冬季による入水温度の変化に対しては、ガバナばねが１４が入水温度を感知してそのばね定数を変化し、固定弁体Ｖ１の下段シート部２ａおよび上段シート部２ｂと可動弁体Ｖ２の弁間隔を広狭に自動調整することによって入水温度に見合った通水量が確保される。
即ち、夏期のように入水温度が高い場合はガバナばね１４がこれを感知してばね定数を高めその弾発力を強くする。
そして、下段シート部２ａと下弁部９ａによる弁間隔は広く保たれ通水量は増大し、また、冬季のように入水温度が低い場合はガバナばね１４がこれを感知してばね定数を下げその弾発力を弱くするため、下段シート部２ａと下弁部９ａによる弁間隔は狭く保たれ通水量は減少する。
従って、ガス量調整にて給湯温度を制御するにあたり、入水温度が変化しても給湯器の最大能力限度を越えない。
また、供給水圧の変動に対してはガバナばね１４と差圧板４前後の差圧力が均衡して、固定弁体Ｖ１の下段シート部２ａと可動弁体Ｖ２の下弁部９ａによる弁開度を流量が一定となるよう自動制御するガバナ機能を備えている。
従って、供給水圧の変動があったとしても、通水量は一定に保たれる。
【００２０】
そして、上述した水温補正付き定流量弁Ｖは、図３に示すように、熱交換器２２への給水路２３に組み込まれる。
給湯に際して給湯栓２４を開放すると、水流センサＳ１が通水を感知し、ガス供給路に設けた元電磁弁ＭＶ１とメイン電磁弁ＭＶ２とが作動し、燃料ガスは、電磁比例弁ＭＶ３の作動によって、目標設定温度に見合うガス量がバーナ２５に供給される。
その結果、給湯器は、常時、設定された温度の給湯を維持する。
尚、Ｆは強制給気用ファン、２６は燃焼室、２７は排気筒、２８は出湯温センサ、２９はコントローラを示している。
【００２１】
上述したように、本実施例の定流量弁Ｖは、固定弁体Ｖ１に設けるガイド部１が、可動弁体Ｖ２の上弁部９ｂを中心軸方向に導くことによって、可動弁体Ｖ２の傾きが矯正され、同心を保ち易くなってガバナ性能が向上する。
また、止めばね１５によって、定流量弁Ｖとして可動弁体Ｖ２の組み込みが容易となると共に、確実な抜け止めができる。
しかも、止めばね１５を組み込む際には、専用の治具を必要としない。
また、当然に、修理の際の脱着を容易に行うことができ、修理時間を短縮できる。
【００２２】
以上、本発明の実施例について説明したが、本発明はこうした実施例に何等限定されるものではなく、本発明の趣旨を逸脱しない範囲において、種々なる態様で実施し得ることは勿論である。
【００２３】
例えば、本実施例では、調節弁５に形成する上段シート部２ｂを部分的に下方に延長し、可動弁体Ｖ２を中心側に導くようにガイド部１が設けられる構成として説明したが、全周にわたって、延長してガイド部１とする構成であっても良い。
【００２４】
また、係止孔１６は、固定弁体Ｖ１の上流側の端部から所定間隔離れた側面の周囲に、実施例では３個設けたが、３個に限定されず止めばね１５が係止できれば何個であっても良い。
【００２５】
【発明の効果】
以上詳述したように、本発明の請求項１記載の水温補正機能付き定流量弁によれば、安価に作製できると共に、ガバナ性能が安定するという優れた効果を奏する。
【００２６】
また、請求項２記載の水温補正機能付き定流量弁によれば、請求項１による効果に加え、組立が容易となって、生産性を向上させることができる。
【図面の簡単な説明】
【図１】一実施例としての水温補正機能付き定流量弁の概略構成図である。
【図２】本発明の実施例に係る止めばねを装着する概略図である。
【図３】本発明の実施例に係る給湯器の概略図である。
【図４】従来の水温補正機能付き定流量弁の概略構成図である。
【符号の説明】
１ガイド部
Ｖ定流量弁
Ｖ１固定弁体
Ｖ２可動弁体
２ａ下段シート部２ｂ上段シート部
３通孔
４差圧板
５調節弁
６ねじ部
７Ｏリング
８止め輪
９ａ下弁部
９ｂ上弁部
１０内壁
１１Ｕリングシール
１２流路孔
１３横孔
１４ガバナばね
１５止めばね
１６係止孔
１７外周溝部
１８段部
ＭＶ１元電磁弁
ＭＶ２メイン電磁弁
ＭＶ３電磁比例弁
Ｆ強制給気用ファン
Ｓ１水流センサ
２１内壁面
２４給湯栓
２５バーナ
２６燃焼室
２７排気筒
２８出湯温センサ
２９コントローラ[0001]
[Industrial application fields]
The present invention relates to a constant flow valve for a water heater, and more particularly to a constant flow valve for a water heater having a water temperature correction function.
[0002]
[Prior art]
Conventionally, a constant flow valve having a water temperature correction function is known.
For example, as shown in Japanese Patent Laid-Open No. 63-303281, in a water heater, a governor function that does not change the amount of water flow even if the supply water pressure fluctuates, and a water temperature correction function that increases or decreases the water flow rate according to a change in water temperature. Is incorporated in the water supply passage to prevent the hot water temperature from being affected by fluctuations in the supply water pressure and the incoming water temperature.
However, there is a problem that a constant flow valve with a water temperature correction function (hereinafter referred to as a constant flow valve) becomes expensive because a shape memory alloy is used.
Therefore, focusing on making the main parts of the constant flow valve resin, the processing man-hours are reduced to reduce the cost, and a constant flow valve with a water temperature correction function can be manufactured at low cost.
Moreover, weight reduction of the constant flow valve is achieved by using resin.
[0003]
[Problems to be solved by the invention]
However, in resin molding, burrs are generated on the mating surfaces of the resin molds. Especially when burrs are generated around important valves in a constant flow valve, the valves can bite or get caught by burrs. As a result, a new problem arises in that the valve is inclined with respect to the central axis and the amount of water is not properly controlled.
For example, in the constant flow valve V with a water temperature correction function shown in FIG. 4, a resin mold for resin-molding the upper sheet portion 2a to which the valve contacts and separates, and a resin mold for resin-molding the through hole 3 for forming a water passage In the resin molding, the direction of removing the resin mold is different.
And since the joint of these resin dies is made in the lower end of the upper sheet part 2a, it becomes easy to generate a burr at this boundary.
As a result, there is a problem that the flow rate cannot be controlled when this burr is caught between the upper valve portion 9a and the upper seat portion 2a.
[0004]
Further, the movable valve body V32 that controls the opening degree of the flow path is affected by the inclination of the governor spring 32 biased in the valve opening direction. In order to stabilize the governor characteristics, the governor spring having a small inclination is used. 32 had to be used and was expensive.
[0005]
Further, the movable valve body V32 is urged by the governor spring 32 from the fixed valve body V31 in the valve opening direction, so that the movable valve body V32 is locked by the C-shaped or ring-shaped stopper 30 and jumps out from the fixed valve body V31. Is prevented.
However, it is difficult to process the mounting location of the fastener 30 in the fixed valve body V31 (the mounting location is undercut and cannot be molded with resin, and must be machined). There has been a problem that a dedicated assembling jig must be used when assembling into the fixed valve body V31.
[0006]
Therefore, the constant flow valve with a water temperature correction function of the present invention solves the above-mentioned problems, eliminates the problems associated with resinization, and makes use of the advantages of resin molding that can easily mold complex shapes, while being inexpensive. The purpose is to make it possible to manufacture a flow valve and to ensure conventional governor performance.
[0007]
[Means for Solving the Problems]
A constant flow valve with a water temperature correction function according to claim 1 of the present invention for solving the above-mentioned problems is provided.
A fixed valve body fixed to the water supply channel and having an upper seat portion and a lower seat portion on a cylindrical inner surface;
It has an upper valve and a lower valve that are inserted coaxially with the fixed valve body so as to be able to advance and retreat, and come into and out of contact with the upper seat portion and the lower seat portion of the fixed valve body, respectively, and a hole through which water supply passes is opened. A movable valve body including a differential pressure plate that receives the differential pressure before and after the hole;
A governor spring formed of a heat sensitive member whose spring constant changes according to a change in water temperature, and urges the movable valve body in a valve opening direction;
In the constant flow valve with a water temperature correction function in which the load of the governor spring and the differential pressure acting on the differential pressure plate are balanced and the flow rate is controlled to be constant,
The upper seat portion is provided separately, and a screw portion that is fixed to the fixed valve body,
The gist is that the upper seat portion is extended to form a guide portion that guides the upper valve of the movable valve body in the central axis direction.
[0008]
The constant flow valve with a water temperature correction function according to claim 2 of the present invention is the constant flow valve according to claim 1,
A locking hole that opens around the upstream side surface of the fixed valve body;
The gist of the invention is that a spring wire is bent to form a substantially triangular shape with the center of one side cut out, and a stop spring that is fitted into the locking hole to prevent the movable valve body from protruding is provided.
[0009]
In the constant flow valve with a water temperature correction function according to claim 1 of the present invention having the above-described configuration, the upper seat portion is provided separately from the fixed valve body, and is fixed to the fixed valve body by a screw portion.
Further, the guide portion formed by extending the upper seat portion guides the upper valve of the movable valve body toward the center as the movable valve body is closed.
Therefore, in the case of resin molding, the upper sheet portion and the fixed valve body can be separately resin-molded, which facilitates resin molding. No burr occurs.
(When the fixed valve body is integrally molded with the upper sheet portion, the end of the upper sheet portion becomes the joint of the resin mold, and molding burrs are likely to occur.)
Further, by making the upper seat part separate, a sufficiently large guide part for guiding the upper valve of the movable valve body can be provided.
The guide portion serves to guide the movable valve body in the central direction as the movable valve body moves in the valve closing direction.
Therefore, the inclination of the movable valve body with respect to the fixed valve body is corrected, the concentricity is easily maintained, and the governor performance is improved.
Further, since the guide portion corrects the inclination, the inclination of the governor spring can be allowed to some extent, and the governor spring can be manufactured at low cost.
[0010]
The constant flow valve with a water temperature correction function according to claim 2 of the present invention having the above-described configuration is such that the spring spring is bent and the stop spring forming a substantially triangular shape with the center of one side notched is bent in the notch direction. The three vertices are inserted into the locking holes around the side surface of the fixed valve body and locked, and the movable valve body biased in the protruding direction is received.
Therefore, the movable valve body can be easily incorporated as a constant flow valve, and can be reliably prevented from coming off. Moreover, a dedicated jig is not required for assembly.
Further, when the fixed valve body is resin-molded, it can be integrally molded with the resin including the locking hole, so that the conventional recess processing is not necessary.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
In order to further clarify the configuration and operation of the present invention described above, a preferred embodiment of the constant flow valve of the present invention will be described below.
FIG. 1 is a schematic view of a constant flow valve V as one embodiment.
V1 is a cylindrical fixed valve body, and includes a lower seat portion 2a that forms a seat surface that is inclined with respect to the central axis.
Similarly, the upper portion of the fixed valve body V1 includes a control valve 5 that forms an upper valve seat portion 2b that is a seat surface inclined with respect to the central axis, and is a screw portion that is coaxial with the lower seat portion 2a. 6 is fixed.
Accordingly, the adjusting valve 5 adjusts the position of the upper valve seat portion 2b in the axial direction by adjusting the degree of screwing.
[0012]
Further, the upper seat portion 2b formed on the control valve 5 extends partially downward while maintaining an inclination angle on the upstream side, and the guide portion 1 is provided so as to reliably guide a movable valve body V2 described later in the central axis direction. Provided.
The fixed valve body V1 and the control valve 5 are resin-molded as separate parts, and the surface is smoothly molded so that no burr on the resin molding occurs in the upper sheet portion 2b and the guide portion 1 of the control valve 5. Moreover, the guide part 1 is provided sufficiently large.
[0013]
A plurality of through holes 3 are provided on the cylindrical outer peripheral surface of the fixed valve body V1 between the upper valve seat portion 2b and the lower seat portion 2a, and the lower valve portion 9a and the upper valve portion of the movable valve body V2 described later are provided. The water passing through the valve portion 9b is guided to the downstream side.
An O-ring 7 that seals against the inner wall surface 21 of the flow path is mounted on the outer peripheral groove 17 of the fixed valve body V1, and is sandwiched between the step 18 of the flow path and the retaining ring 8 so as to be fixed. Is fixed to the flow path.
[0014]
V2 inserted into the fixed valve body V1 is a movable valve body, and a lower valve portion 9a and an upper valve portion 9b that come in contact with and separate from the lower-stage seat portion 2a and the upper valve seat portion 2b provided in the fixed valve body V1, respectively. A differential pressure plate 4 that is provided on the upper and lower sides, slides on the inner wall 10 of the fixed valve body with a U-ring seal 11 mounted on the outer periphery, and divides the flow path into an upstream side and a downstream side is integrally provided.
The differential pressure plate 4 is provided with a flow passage hole 12a penetrating the shaft center and a plurality of flow passage holes 12b around the flow passage hole 12a. The upstream side of the differential pressure plate 4 communicates with the upper space in the fixed valve body V1. is doing.
Further, a plurality of lateral holes 13 are opened perpendicularly to the axis on the outer peripheral side surface of the movable valve body V2 between the differential pressure plate 4 and the lower valve portion 9a, and communicate with the flow path hole 12a.
[0015]
The U-ring seal 11 is made of an elastic material made of rubber and is formed in a U-ring shape that can be easily compressed. The U-ring seal 11 is attached to the outer periphery of the differential pressure plate 4 with the U-ring-shaped opening facing upstream. The sliding resistance is reduced while the side surface of one end of the side abuts against and seals against the inner wall 10.
[0016]
Further, a governor spring 14 is coaxially disposed between the control valve 5 provided on the fixed valve body V1 and the movable valve body V2, and the movable valve body V2 is biased in a direction away from the control valve 5. .
Then, the differential pressure generated before and after the governor spring 14 and the differential pressure plate 4 and the governor spring 14 force are balanced, whereby the flow rate passing through the lower valve portion 9a and the upper valve portion 9b is controlled to be constant.
A stop spring 15 for receiving the protrusion of the inserted movable valve body V2 is provided on the upstream side of the fixed valve body V1.
Further, the governor spring 14 is made of a shape memory alloy that is a heat sensitive member whose spring constant changes according to a change in water temperature, and is selected so that the spring load characteristic with respect to the temperature has an appropriate proportional relationship with the actual hot water supply temperature. .
[0017]
Locking holes 16 are provided at three locations around the side surface that is a predetermined distance away from the upstream end of the fixed valve body V1 (FIG. 2).
The locking hole 16 is formed at the same time when the fixed valve body V1 is resin-molded.
Also, the stop spring 15 formed by bending the spring wire forms a substantially triangular shape with the center of one side of the triangle cut out, and its three vertices are fitted into the locking holes on the side surface of the fixed valve body.
And the stop spring 15 receives the movable valve body V2, and prevents the protrusion.
Further, the snap-in spring 15 can be easily fitted by inserting the apex of the triangle into the locking hole 16 while bending in the notch direction.
Therefore, a dedicated jig is not required for assembly, and the constant flow valve can be easily assembled.
[0018]
The parts other than the O-ring 7, the retaining ring 8, the U-ring seal 11, the governor spring 14 and the retaining spring 15 described above are molded from resin.
[0019]
Next, a description will be given of the water temperature correction function.
In this constant flow valve V, the spring force increases and decreases according to the change of the incoming water temperature, and the valve gap between the fixed valve body V1 and the movable valve body V2 increases and decreases proportionally. Increases or decreases proportionally.
For example, in response to changes in the incoming water temperature during summer and winter, the governor spring 14 senses the incoming water temperature and changes its spring constant, so that the lower seat portion 2a and upper seat portion 2b of the fixed valve body V1 and the movable valve By automatically adjusting the valve interval of the body V2 in a wide and narrow manner, the amount of water flow commensurate with the incoming water temperature is secured.
That is, when the incoming water temperature is high as in summer, the governor spring 14 senses this and raises the spring constant to increase its elasticity.
The valve interval between the lower seat portion 2a and the lower valve portion 9a is kept wide, and the water flow rate increases, and when the incoming water temperature is low as in winter, the governor spring 14 detects this and lowers the spring constant. In order to weaken the resilience, the valve interval between the lower seat portion 2a and the lower valve portion 9a is kept narrow, and the amount of water flow is reduced.
Therefore, when the hot water temperature is controlled by adjusting the gas amount, the maximum capacity limit of the hot water heater is not exceeded even if the incoming water temperature changes.
Further, the pressure difference between the governor spring 14 and the differential pressure plate 4 is balanced against the fluctuation of the supply water pressure, and the valve opening degree by the lower seat portion 2a of the fixed valve body V1 and the lower valve portion 9a of the movable valve body V2 is increased. It has a governor function that automatically controls the flow rate to be constant.
Therefore, even if the supply water pressure fluctuates, the water flow rate is kept constant.
[0020]
And the constant flow valve V with a water temperature correction mentioned above is integrated in the water supply path 23 to the heat exchanger 22, as shown in FIG.
When the hot water tap 24 is opened at the time of hot water supply, the water flow sensor S1 senses water flow, the original electromagnetic valve MV1 and the main electromagnetic valve MV2 provided in the gas supply path are operated, and the fuel gas is generated by the operation of the electromagnetic proportional valve MV3. A gas amount corresponding to the target set temperature is supplied to the burner 25.
As a result, the water heater always maintains the hot water supply at the set temperature.
Note that F is a forced air supply fan, 26 is a combustion chamber, 27 is an exhaust pipe, 28 is a hot water temperature sensor, and 29 is a controller.
[0021]
As described above, in the constant flow valve V of the present embodiment, the guide portion 1 provided in the fixed valve body V1 guides the upper valve portion 9b of the movable valve body V2 in the central axis direction, whereby the inclination of the movable valve body V2 is increased. Is corrected and it becomes easy to keep concentricity, and governor performance improves.
Further, the stop spring 15 makes it easy to incorporate the movable valve body V2 as the constant flow valve V, and can surely prevent it from coming off.
In addition, when the stop spring 15 is assembled, a dedicated jig is not required.
Naturally, it is possible to easily perform detachment at the time of repair, and the repair time can be shortened.
[0022]
As mentioned above, although the Example of this invention was described, this invention is not limited to such an Example at all, Of course, in the range which does not deviate from the meaning of this invention, it can implement in a various aspect.
[0023]
For example, in this embodiment, the upper seat portion 2b formed on the control valve 5 is partially extended downward, and the guide portion 1 is provided so as to guide the movable valve body V2 to the center side. A configuration may be adopted in which the guide portion 1 is extended over the circumference.
[0024]
Further, in the embodiment, three locking holes 16 are provided around the side face that is separated from the upstream end of the fixed valve body V1 by a predetermined distance. However, the number is not limited to three, and the locking spring 15 can be locked. Any number is acceptable.
[0025]
【The invention's effect】
As described above in detail, according to the constant flow valve with a water temperature correction function of the first aspect of the present invention, it can be manufactured at low cost and has an excellent effect that the governor performance is stabilized.
[0026]
Further, according to the constant flow valve with a water temperature correction function according to the second aspect, in addition to the effect of the first aspect, the assembly becomes easy and the productivity can be improved.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram of a constant flow valve with a water temperature correction function as one embodiment.
FIG. 2 is a schematic view of mounting a stop spring according to an embodiment of the present invention.
FIG. 3 is a schematic view of a water heater according to an embodiment of the present invention.
FIG. 4 is a schematic configuration diagram of a conventional constant flow valve with a water temperature correction function.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Guide part V Constant flow valve V1 Fixed valve body V2 Movable valve body 2a Lower seat part 2b Upper seat part 3 Through-hole 4 Differential pressure plate 5 Control valve 6 Screw part 7 O ring 8 Retaining ring 9a Lower valve part 9b Upper valve part 10 Inner wall 11 U ring seal 12 Channel hole 13 Horizontal hole 14 Governor spring 15 Stopping spring 16 Locking hole 17 Outer peripheral groove 18 Stepped part MV1 Original solenoid valve MV2 Main solenoid valve MV3 Solenoid proportional valve F Forced air supply fan S1 Water flow sensor 21 Inner wall surface 24 Hot-water tap 25 Burner 26 Combustion chamber 27 Exhaust tube 28 Hot water temperature sensor 29 Controller

Claims

A fixed valve body fixed to the water supply channel and having an upper seat portion and a lower seat portion on a cylindrical inner surface;
It has an upper valve and a lower valve that are inserted coaxially with the fixed valve body so as to be able to advance and retreat, and come into and out of contact with the upper seat portion and the lower seat portion of the fixed valve body, respectively, and a hole through which water supply passes is opened. A movable valve body including a differential pressure plate that receives the differential pressure before and after the hole;
A governor spring formed of a heat sensitive member whose spring constant changes according to a change in water temperature, and urges the movable valve body in a valve opening direction;
In the constant flow valve with a water temperature correction function in which the load of the governor spring and the differential pressure acting on the differential pressure plate are balanced and the flow rate is controlled to be constant,
The upper seat portion is provided separately, and a screw portion that is fixed to the fixed valve body,
A constant flow valve with a water temperature correction function, wherein an upper seat portion is extended to form a guide portion that guides the upper valve of the movable valve body in the central axis direction.

A locking hole that opens around the upstream side surface of the fixed valve body;
2. A spring spring is formed by bending a spring wire to form a substantially triangular shape with a center of one side cut out, and a stop spring that is fitted in the locking hole to prevent the movable valve body from protruding. Constant flow valve with water temperature compensation function as described.