JP2001343076A - Control valve - Google Patents
Control valveInfo
- Publication number
- JP2001343076A JP2001343076A JP2001076878A JP2001076878A JP2001343076A JP 2001343076 A JP2001343076 A JP 2001343076A JP 2001076878 A JP2001076878 A JP 2001076878A JP 2001076878 A JP2001076878 A JP 2001076878A JP 2001343076 A JP2001343076 A JP 2001343076A
- Authority
- JP
- Japan
- Prior art keywords
- valve
- valve body
- control
- stopper
- port
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B5/00—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity
- F25B5/04—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity arranged in series
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
- F25B2400/04—Refrigeration circuit bypassing means
- F25B2400/0409—Refrigeration circuit bypassing means for the evaporator
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
- F25B2400/04—Refrigeration circuit bypassing means
- F25B2400/0411—Refrigeration circuit bypassing means for the expansion valve or capillary tube
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、冷蔵庫の冷蔵循環
サイクルと冷凍循環サイクルを切換えるなどの複数の弁
口を開閉自由に切換えると共に各出口弁口の流量を自由
に制御できる制御弁に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control valve capable of freely switching a plurality of valve ports such as switching between a refrigeration circulation cycle and a refrigeration circulation cycle of a refrigerator and freely controlling a flow rate at each outlet valve port. is there.
【０００２】従来、冷蔵庫の冷蔵循環サイクルと冷凍循
環サイクルを切換えるなどの用途に、複数方向を切換え
る制御弁として特開平１１−３１１３６１号公報に開示
された３方向電磁弁が提案されている。図１１は、この
３方向電磁弁３２を用いた場合の冷蔵庫を示すものであ
り、冷凍サイクル２１は、コンプレッサ２２、コンデン
サ２３、ドライヤ２４、キャピラリチューブ２５、冷蔵
室用エバポレータ２６、冷凍室用エバポレータ２７、ア
キュムレータ２８が流体流路たる冷媒流通パイプ２９と
接続されている。また、前記冷凍サイクル２１には、前
記キャピラリチューブ２５及び冷蔵室用エバポレータ２
６に対して流体流路たるバイパス用の冷媒流通パイプ３
０及びキャピラリチューブ３１が並列に設けられてい
る。そして、前記冷媒流通パイプ２９とバイパス用の冷
媒流通パイプ３０との分岐部分には、３方向電磁弁３２
が設けられている。つまり、この冷蔵庫においては、コ
ンプレッサ、コンデンサ、ドライヤ、３方向電磁弁、キ
ャピラリーチューブ、冷蔵室用エバポレータ、冷凍室用
エバポレータ、アキュムレータ、冷媒流通パイプと接続
されて、冷蔵と冷凍のサイクルを前記の３方電磁弁によ
り、一方が遮断の閉の時は、他方は開というように切換
えていた。2. Description of the Related Art Conventionally, a three-way solenoid valve disclosed in Japanese Patent Application Laid-Open No. H11-31361 has been proposed as a control valve for switching between a plurality of directions for applications such as switching between a refrigeration circulation cycle and a refrigeration circulation cycle of a refrigerator. FIG. 11 shows a refrigerator using the three-way solenoid valve 32. The refrigeration cycle 21 includes a compressor 22, a condenser 23, a dryer 24, a capillary tube 25, a refrigerator compartment evaporator 26, and a refrigerator compartment evaporator. 27, an accumulator 28 is connected to a refrigerant flow pipe 29 as a fluid flow path. The refrigerating cycle 21 includes the capillary tube 25 and the evaporator 2 for a refrigerator.
6 is a refrigerant flow pipe 3 for bypass which is a fluid flow path for
0 and a capillary tube 31 are provided in parallel. A three-way solenoid valve 32 is provided at a branch portion between the refrigerant flow pipe 29 and the refrigerant flow pipe 30 for bypass.
Is provided. That is, this refrigerator is connected to a compressor, a condenser, a dryer, a three-way solenoid valve, a capillary tube, an evaporator for a refrigerator compartment, an evaporator for a freezer compartment, an accumulator, and a refrigerant circulation pipe, and performs the cycle of refrigeration and refrigeration as described in the above-mentioned three. The one solenoid valve was switched so that when one was shut off and the other was open.
【０００３】前記の冷凍サイクルで用いられる従来の３
方向電磁弁は、図１２に示すように、弁本体３３の軸方
向両端部には、第１及び第２の吸引子３４及び３５が圧
入され、弁本体３３の内部に弁室３６が形成されてい
る。また、弁本体３３の上部にはチューブ３８が挿入さ
れており、このチューブ３８の外周部にはボビン３７ａ
を介してソレノイド３７が装着されている。また、弁本
体３３には、３個の孔部３９〜４１が形成され、真ん中
の孔部４０は弁室３６と連通しており、この孔部４０と
対応して弁本体３３の外周面には入口パイプ４２が接続
されている。上方に位置する孔部３９は、第１の吸引子
３４に形成された通路３４ａを介して前記弁室３６と連
通しており、前記孔部３９に対応して弁本体３３の外周
面には第１の出口パイプ４３が接続されている。下方に
位置する孔部４１は、第２の吸引子３５に形成された通
路３５ａを介して前記弁室３６と連通しており、前記孔
部４１に対応して弁本体３３の外周面には第２の出口パ
イプ４４が接続されている。[0003] The conventional 3 used in the refrigeration cycle described above.
As shown in FIG. 12, in the directional solenoid valve, first and second suction elements 34 and 35 are press-fitted at both axial ends of a valve body 33, and a valve chamber 36 is formed inside the valve body 33. ing. A tube 38 is inserted into the upper part of the valve body 33, and a bobbin 37a
, A solenoid 37 is mounted. Further, three holes 39 to 41 are formed in the valve main body 33, and the middle hole 40 communicates with the valve chamber 36, and the outer peripheral surface of the valve main body 33 corresponds to the hole 40. Is connected to an inlet pipe 42. The hole 39 located above communicates with the valve chamber 36 through a passage 34 a formed in the first suction element 34, and the outer peripheral surface of the valve body 33 corresponds to the hole 39. The first outlet pipe 43 is connected. The lower hole 41 communicates with the valve chamber 36 through a passage 35 a formed in the second suction element 35, and the outer peripheral surface of the valve body 33 corresponds to the hole 41. A second outlet pipe 44 is connected.
【０００４】また、第１の吸引子３４の弁室３６側の端
部には弁座４５が固定され、第２の吸引子３５の弁室３
６側の端部には弁座４６が固定されている。一方、前記
弁室３６内には、磁性体の弁体４７が軸方向に移動可能
に配設されている。そして、この弁体４７の軸方向両端
部には、鉄製のボール５０及び５１が配設され、これら
ボール５０，５１の間には、付勢手段としてのボール用
コイルばね５２が設けられており、このコイルばね５２
の弾発力により、弁体４７が第１及び第２の吸引子３４
及び３５に当接したとき、ボール５０が弁座４５，４６
に当接し、通路３４ａ，３５ａを気密に閉鎖するように
構成されている。A valve seat 45 is fixed to an end of the first suction element 34 on the valve chamber 36 side, and a valve chamber 3 of the second suction element 35 is provided.
A valve seat 46 is fixed to the end on the sixth side. On the other hand, a magnetic valve element 47 is disposed in the valve chamber 36 so as to be movable in the axial direction. Iron balls 50 and 51 are disposed at both axial ends of the valve element 47, and a ball coil spring 52 as a biasing means is provided between the balls 50 and 51. , This coil spring 52
Of the first and second suction elements 34 by the elastic force of
When the ball 50 comes into contact with the valve seats 45 and 46,
, So that the passages 34a and 35a are hermetically closed.
【０００５】また、前記の弁体４７と第１及び第２の吸
引子３４及び３５との間には、それぞれ付勢手段として
の第１及び第２のコイルばね４８及び４９が設けられて
おり、これらのスプリング力（付勢力）により、弁体４
７は上方及び下方に略等しく付勢されるように構成され
ている。そして、前記コイルばね４８及び４９のスプリ
ング力に抗する力で弁体４７を第１の吸引子３４側に押
す力が作用すると、弁体４７は第１の吸引子３４側に移
動されて通路３４ａを閉鎖するようになっている。ま
た、前記コイルばね４８及び４９のスプリング力に抗す
る力で弁体４７を第２の吸引子３５側に押す力が作用す
ると、前記弁体４７は第２の吸引子３５側に移動されて
通路３５ａを閉鎖するようになっている。Further, between the valve body 47 and the first and second suction elements 34 and 35, there are provided first and second coil springs 48 and 49 as urging means, respectively. , The spring force (biasing force) of the valve element 4
7 is configured to be urged substantially equally upward and downward. Then, when a force that pushes the valve element 47 toward the first suction element 34 by a force opposing the spring force of the coil springs 48 and 49 acts, the valve element 47 is moved to the first suction element 34 side and passes through the passage. 34a is closed. When a force that pushes the valve element 47 toward the second suction element 35 by a force opposing the spring force of the coil springs 48 and 49 acts, the valve element 47 is moved to the second suction element 35 side. The passage 35a is closed.
【０００６】また、弁本体３３及びソレノイド３７の周
囲には、略矩形枠状をなす鉄製のハウジング５３が設け
られている。このハウジング５３は、Ｕ字状部材５３ａ
と、このＵ字状部材３３ａの端部に連結された板状部材
５３ｂとから構成されている。そして、前記ハウジング
５３の上辺部の略中央部に第１の吸引子３４の上端部が
連結されており、前記ハウジング５３の下辺部の略中央
部に第２の吸引子３５の下端部が連結されている。ま
た、図示しないが、前記ハウジング５３の内面には、前
記弁本体１３を挟むように配置された２個の永久磁石が
固定され、永久磁石、ハウジング５３，第１の吸引子３
４，弁体４７，永久磁石からなる磁気回路と、永久磁
石，ハウジング５３，第２の吸引子３５，弁体４７，永
久磁石からなる磁気回路が形成される。A substantially rectangular frame-shaped iron housing 53 is provided around the valve body 33 and the solenoid 37. The housing 53 includes a U-shaped member 53a.
And a plate-shaped member 53b connected to an end of the U-shaped member 33a. The upper end of the first suction element 34 is connected to the substantially central part of the upper side of the housing 53, and the lower end of the second suction element 35 is connected to the substantially central part of the lower side of the housing 53. Have been. Although not shown, two permanent magnets arranged so as to sandwich the valve body 13 are fixed to the inner surface of the housing 53, and the permanent magnet, the housing 53, and the first suction element 3 are fixed.
4, a magnetic circuit including the valve body 47 and the permanent magnet, and a magnetic circuit including the permanent magnet, the housing 53, the second attraction element 35, the valve body 47, and the permanent magnet are formed.
【０００７】このような従来の３方向電磁弁における作
動は、弁体４７を第一の吸引子３４側あるいは第二の吸
引子側に移動させたときには、一方の流体流路を遮断さ
せ、他方の流体流路を開放させるというものであった。The operation of such a conventional three-way solenoid valve is such that when the valve element 47 is moved to the first suction element 34 side or the second suction element side, one fluid flow path is shut off and the other is shut off. Was opened.
【０００８】[0008]
【発明が解決しようとする課題】今後ますますコストダ
ウン並びに、冷蔵室及び冷凍室の最適制御が望まれる中
にあって、前述した従来の冷凍回路においては、キャピ
ラリーチューブのみで冷媒流量をきめこまかに変化させ
ることができず、また、このキャピラリーチューブの部
品費、またロウ付費がかかるといった課題があった。As cost reduction and optimal control of the refrigerator compartment and the freezer compartment are desired in the future, in the above-mentioned conventional refrigeration circuit, the flow rate of the refrigerant is precisely controlled only by the capillary tube. There is a problem in that the capillary tube cannot be changed, and the parts cost and the brazing cost of the capillary tube are required.
【０００９】[0009]
【課題を解決するための手段】本発明は、従来の３方向
電磁弁では、各々の出口弁口のきめこまかな絞り制御が
できなかったものを、ステッピングモーター方式の制御
弁にすると共に、弁体の制御部によってそれぞれの出口
弁口の開度を絞り制御させるようにし、全閉から全開の
範囲において、任意に絞り制御できるようにした制御弁
の提供を目的とするものである。SUMMARY OF THE INVENTION The present invention provides a stepping motor type control valve instead of a conventional three-way solenoid valve which could not finely control the throttle of each outlet valve port. It is an object of the present invention to provide a control valve in which the degree of opening of each outlet valve port is controlled by the control unit of (1) and the throttle control can be arbitrarily performed in a range from fully closed to fully open.
【００１０】本願の第１の発明は、上方中心部に軸受部
１ｂを設けると共に下方を拡開させて段１ａを設けてな
る逆有底筒状の密閉ケース１の外方にコイル２を配置さ
せ、前記密閉ケースの開口下端部には、中心部に軸穴３
ａを設け、入口通路８に連通する弁口３ｂ並び複数の出
口通路９に連通する複数の弁口３ｃ 、弁口３ｄを設
け、さらにストッパーの位置決め穴３ｅを設けてなる弁
座シート３を気密的に固定し、一方、上端部をケースの
軸穴１ｂで支持すると共に下端部を弁座シートの軸穴３
ａにて支持させるようにしたシャフト４には、圧縮コイ
ルばね１０と、下端部に弁体を回動させる係止部５ａと
ストッパーに当接する当接部５ｂを備えたロータ５と、
上方に前記の係止部５ａと当接する回転伝達部６ａを備
えると共に下面に弁座シート３の出口弁口３ｃ 、弁口
３ｄの開度を絞り制御させる制御部６ｃを備えた弁体６
を配置させ、前記のロータ５と弁体６とを圧縮コイルば
ね１０により下方に付勢させ、密閉ケース１に圧入固定
されるストッパー７は、断面が逆Ｕ字状のリングに形成
され、その下方に前記ストッパーの位置決め穴３ｅに嵌
着される位置決め片７ｂを設けると共に、リングの内側
上方には前記の当接部５ｂと係合するストッパー部７ａ
を設け、前記弁座シート３面上を、弁体６が１回転未満
の範囲で回転摺動することにより、出口通路９に連通す
る複数の弁口３ｃ 、弁口３ｄの開度を絞り制御して流
路の切換並びに流量を制御するようにしたことを特徴と
する制御弁である。According to a first aspect of the present invention, a coil 2 is disposed outside a reverse-bottomed cylindrical sealed case 1 provided with a bearing 1b at an upper central portion and an expanded lower portion to provide a step 1a. At the lower end of the opening of the closed case, a shaft hole 3 is provided at the center.
a, a plurality of valve ports 3c and a plurality of valve ports 3d communicating with the inlet passage 8 and the plurality of outlet passages 9 are provided, and the valve seat 3 is provided with a stopper positioning hole 3e. While the upper end is supported by the shaft hole 1b of the case and the lower end is formed by the shaft hole 3 of the valve seat.
a shaft 4 adapted to be supported by a, a compression coil spring 10, a rotor 5 having a locking portion 5a at the lower end for rotating the valve element and a contact portion 5b for contacting the stopper;
A valve body 6 having a rotation transmitting portion 6a which is in contact with the locking portion 5a above and a control portion 6c on the lower surface for controlling the opening degree of the outlet valve opening 3c and the opening of the valve opening 3d.
Is disposed, and the rotor 5 and the valve element 6 are urged downward by the compression coil spring 10, and the stopper 7 that is press-fitted and fixed to the sealed case 1 is formed in an inverted U-shaped ring in cross section. A positioning piece 7b to be fitted into the positioning hole 3e of the stopper is provided below, and a stopper 7a engaging with the contact part 5b is provided above the inside of the ring.
The valve body 6 rotates and slides on the surface of the valve seat 3 within a range of less than one rotation, thereby restricting the opening of the plurality of valve ports 3c and 3d communicating with the outlet passage 9. A control valve for switching the flow path and controlling the flow rate.
【００１１】また、本願の第２の発明は、弁座シート３
に設けられる弁口３ｃ 、弁口３ｄをほぼ軸対象の位置
に対向させて設けると共に、弁体の制御部６ｃの形状を
インボリュート曲線のカム板形状等に形成し、弁体６の
１回転未満で各々の弁口３ｃ、弁口３ｄの開度を全閉か
ら全開の状態に制御できるようにしたことを特徴とする
請求項１記載の制御弁である。A second invention of the present application is a valve seat 3
The valve port 3c and the valve port 3d are provided so as to be substantially opposed to the positions symmetrical with each other, and the shape of the control section 6c of the valve body is formed into a cam plate shape having an involute curve, and the valve body 6 rotates less than one rotation. 2. The control valve according to claim 1, wherein the opening degree of each of the valve ports 3c and 3d can be controlled from a fully closed state to a fully opened state.
【００１２】また、本願の第３の発明は、弁座シート３
に設けられる弁口３ｃ 、弁口３ｄをほぼ軸対象の位置
に対向させて設けると共に、弁体の制御部６ｃの形状を
厚肉の円筒状に形成し、前記制御部６ｃの下面には約１
８０°の範囲に渡って流体通路の面積が漸増する円弧状
溝６ｄを設けると共に、該円弧状溝６ｄの流体通路の面
積が最大となる位置に流入口６ｅを設け、弁体６の１回
転未満で各々の弁口３ｃ 、弁口３ｄの開度を全閉から
全開の状態に制御できるようにしたことを特徴とする請
求項１記載の制御弁。A third aspect of the present invention is directed to a valve seat 3
The valve port 3c and the valve port 3d are provided so as to be substantially opposed to the positions symmetrical with each other, and the control portion 6c of the valve body is formed in a thick cylindrical shape. 1
An arc-shaped groove 6d whose area of a fluid passage gradually increases over a range of 80 ° is provided, and an inflow port 6e is provided at a position where the area of the fluid passage of the arc-shaped groove 6d is maximized. 2. The control valve according to claim 1, wherein the opening degree of each of the valve ports 3c and 3d can be controlled from a fully closed state to a fully opened state when the number is less than or equal to.
【００１３】また、本願の第４の発明は、弁座シート３
に設けられた弁口３ｃに対して弁口３ｄの位置が、軸心
に対して異なった半径ｒの円周上に設けられたことを特
徴とする請求項１記載の制御弁である。A fourth invention of the present application is a valve seat 3
2. The control valve according to claim 1, wherein the position of the valve port 3d is provided on a circumference having a different radius r with respect to the axis with respect to the valve port 3c provided in the control valve.
【００１４】[0014]
【発明の実施の形態】本発明の、一実施例を図面に基づ
き詳細に説明する。図１は、本発明の制御弁の縦断面図
を示すものである。本発明の制御弁は、密閉ケース１と
コイル２と弁座シート３とシャフト４とロータ５と弁体
６とストッパー７と圧縮コイルばね１０とにより構成さ
れている。DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 shows a longitudinal sectional view of the control valve of the present invention. The control valve of the present invention includes a closed case 1, a coil 2, a valve seat 3, a shaft 4, a rotor 5, a valve body 6, a stopper 7, and a compression coil spring 10.
【００１５】密閉ケース１は、逆有底筒状に形成され段
差部１ａを有しており、該密閉ケース１の外方にはコイ
ル２が配置され、またケースの開口下端部には弁座シー
ト３が気密的に固定されている。そして、前記の弁座シ
ート３の上面には、中心部に軸穴３ａを設けると共に、
入り口通路８に連通する弁口３ｂ並び複数の出口通路９
に連通する複数の弁口３ｃ、弁口３ｄが設けられ、さら
に後述するストッパー７の位置決め穴３ｅが設けられて
いる。The closed case 1 is formed in an inverted bottomed cylindrical shape and has a stepped portion 1a. A coil 2 is disposed outside the closed case 1, and a valve seat is provided at a lower end of the opening of the case. The sheet 3 is fixed in an airtight manner. A shaft hole 3a is provided at the center on the upper surface of the valve seat 3, and
A plurality of outlet passages 9 arranged in line with the valve openings 3b communicating with the entrance passage 8
Are provided with a plurality of valve ports 3c and 3d, and a positioning hole 3e of a stopper 7 described later is provided.
【００１６】シャフト４は、その上端部が前記ケースの
軸穴１ｂで支持されると共に下端部が弁座シートの軸穴
３ａにて支持されるようになっており、該シャフト４に
は、上方より圧縮コイルばね１０とロータ５と弁体６が
配置されている。なお、前記の圧縮コイルばね１０はロ
ータ５の上方に配置されているが、必ずしもこの形態に
限定するものでなく、弁体６を下方に押し付けることが
できればどこに配置してもよいものである。The shaft 4 has an upper end supported by a shaft hole 1b of the case and a lower end supported by a shaft hole 3a of a valve seat. The compression coil spring 10, the rotor 5, and the valve body 6 are further arranged. The above-described compression coil spring 10 is arranged above the rotor 5, but is not necessarily limited to this form, and may be arranged anywhere as long as the valve body 6 can be pressed downward.
【００１７】ロータ５には、その下端部に弁体を回動さ
せる係止部５ａが設けられると共に、該係止部５ａと対
峙し且つ下方へ下がった位置に後述するストッパー７に
当接する当接部５ｂが設けられている。The rotor 5 is provided at its lower end with a locking portion 5a for rotating the valve element, and is provided at a position opposed to the locking portion 5a and lowered to contact a stopper 7 described later. A contact portion 5b is provided.
【００１８】弁体６には、上面から上方に伸び、前記の
係止部５ａと当接させる回転伝達部６ａが設けられると
共に、下面には弁座シート３の弁口３ｃ、弁口３ｄを開
閉並びに全閉から全開の領域に渡って流量を任意に絞り
制御させる制御部６ｃが設けられている。なお、図面で
は、回転伝達部６ａが弁体の軸と平行して設けられてい
るが、例えばこれを弁体の軸の上端部に形成してもよい
(図示しない。)。The valve body 6 is provided with a rotation transmitting portion 6a extending upward from the upper surface and brought into contact with the locking portion 5a, and has a valve opening 3c and a valve opening 3d of the valve seat 3 on the lower surface. A control unit 6c for arbitrarily restricting and controlling the flow rate over an open / closed and fully closed to fully open region is provided. In the drawings, the rotation transmitting portion 6a is provided in parallel with the axis of the valve body, but it may be formed, for example, at the upper end of the axis of the valve body.
(Not shown).
【００１９】次に本発明の作動状態を説明する。図２
は、作動条件１の状態で制御部６ｃの形状は、インボリ
ュート曲線のカム板形状等に形成されており、図に示す
矢印のほうこうに弁体６が回転した時には、一方の出口
弁口が全閉から全開になる間（約弁体の半回転）は、他
方の出口弁口が閉じるようになっている。また、弁座シ
ート３に設けられる弁口３ｃ 、弁口３ｄは、ほぼ軸対
象の位置に対向させて設けられているが、カム板形状の
形態によっては必ずしも軸対象の位置に対向さなくても
よいのは言うまでもない。Next, the operation of the present invention will be described. FIG.
In the state of the operating condition 1, the shape of the control unit 6c is formed in the shape of a cam plate having an involute curve, and when the valve body 6 rotates in the direction of the arrow shown in the figure, one of the outlet valve ports is fully closed. During the period from closing to full opening (about half a rotation of the valve body), the other outlet valve port is closed. Further, the valve ports 3c and 3d provided in the valve seat 3 are provided so as to be substantially opposed to the positions symmetrical with each other. However, depending on the shape of the cam plate, the valve ports 3c and 3d are not necessarily opposed to the positions symmetrical with each other. Needless to say, it is good.
【００２０】図３は、作動条件２の状態で制御部６ｃの
形状は、厚肉の円筒状に形成されており、この制御部６
ｃの下面には約１８０°の範囲に渡って流体通路の面積
が漸増する円弧状溝６ｄ（図４は、図３の弁体の円弧状
溝の展開図を示す。）が設けられると共に、該円弧状溝
６ｄの流体通路の面積が最大となる位置に流入口６ｅが
設けられている。なお、図中、Ａ点は全閉の一を示し、
Ｂ点は全開の位置を示している。また、弁口３ｃ 、弁
口３ｄの配置並びに、弁体６が回転した時には、一方の
出口弁口が全閉から全開になる間（約弁体の半回転）
は、他方の出口弁口が閉じるようになっているのは図２
の形態と同じである。FIG. 3 shows that the control section 6c is formed in a thick cylindrical shape under the condition of the operating condition 2.
On the lower surface of c, an arc-shaped groove 6d (FIG. 4 is a development view of the arc-shaped groove of the valve body of FIG. 3) is provided in which the area of the fluid passage gradually increases over a range of about 180 °. An inlet 6e is provided at a position where the area of the fluid passage of the arc-shaped groove 6d is maximized. In the figure, point A indicates one of the fully closed positions,
Point B indicates the fully open position. In addition, when the valve ports 3c and 3d are arranged and the valve element 6 is rotated, one of the outlet valve ports is changed from the fully closed state to the fully opened state (about half a rotation of the valve element).
Fig. 2 shows that the other outlet valve port is closed.
It is the same as the form.
【００２１】ストッパー７は、断面が逆Ｕ字状のリング
に形成されており、前記の密閉ケース１に圧入固定され
るものであり、該ストッパー７には、下方に伸び、前記
ストッパーの位置決め穴３ｅに嵌着される位置決め片７
ｂが設けられると共に、リングの内側上方には前記の当
接部５ｂと係合する円弧状のストッパー部７ａが設けら
れている。なお、前記のストッパー部７ａの形状は、パ
ルス数の関係で平板でもよい。The stopper 7 is formed in a ring having an inverted U-shaped cross section and is press-fitted and fixed to the closed case 1. The stopper 7 extends downward and has a positioning hole for the stopper. Positioning piece 7 fitted to 3e
b is provided, and an arc-shaped stopper portion 7a which engages with the contact portion 5b is provided above the inside of the ring. The shape of the stopper portion 7a may be a flat plate due to the number of pulses.
【００２２】上記のごとく構成された本発明の制御弁で
は、前記弁座シート３面上を、弁体６が１回転未満の範
囲で回転摺動することにより、出口通路９に連通する複
数の弁口３ｃ 、弁口３ｄの開度を絞り制御して流路の
切換並びに流量を制御することができるようになってい
る。In the control valve of the present invention configured as described above, the plurality of valve bodies 6 are rotatably slid on the surface of the valve seat 3 within a range of less than one rotation to thereby communicate with the plurality of outlet passages 9. The switching of the flow path and the flow rate can be controlled by restricting the opening degrees of the valve ports 3c and 3d.
【００２３】図５は、図２と図３の作動条件における制
御弁の流量特性図であり、始めの弁体の約半回転では、
出口弁口３ｃは全閉から全開になる間が絞り制御され、
後の半回転では、他方の出口弁口３ｄは全閉から全開に
なる間が絞り制御される状態を示すものである。FIG. 5 is a flow rate characteristic diagram of the control valve under the operating conditions of FIGS. 2 and 3.
The outlet valve port 3c is throttle-controlled during the period from fully closed to fully open,
In the latter half rotation, the other outlet valve port 3d indicates a state where the throttle control is performed during a period from the fully closed state to the fully opened state.
【００２４】図６は、本発明に係る他の実施例１を示
す、弁体と弁座シートの平面図であり、図２に示す制御
部６ｃの形状に対して相違するのは、弁体の約半回転分
の位置で左右が相似形になるようにインボリュート曲線
のカム板形状に形成したものである。FIG. 6 is a plan view of a valve body and a valve seat showing another embodiment 1 of the present invention. The difference between the shape of the control unit 6c shown in FIG. The cam plate is formed in an involute curve so that the left and right sides have a similar shape at a position corresponding to about a half turn.
【００２５】図７は、本発明に係る他の実施例２を示
す、弁体と弁座シートの平面図であり、図２に示す制御
部６ｃのの形状に対して相違するのは、弁体の約半回転
分の位置で左右が相似形になるように制御部６ｃの下面
に２つの円弧状の溝６ｄを形成したものである。FIG. 7 is a plan view of a valve body and a valve seat showing another embodiment 2 of the present invention. The difference between the shape of the control section 6c shown in FIG. Two arc-shaped grooves 6d are formed on the lower surface of the control section 6c so that the left and right sides have a similar shape at a position corresponding to about half a rotation of the body.
【００２６】図８は、図６と図７の作動条件における制
御弁の流量特性図である。この形態では、一方の出口弁
口３ｃは、始めの弁体の約半回転で全閉から全開にな
り、後の半回転で全閉になるようになっている。また、
他方の出口弁口３ｄは、逆に全開→全閉→全開と制御さ
れるようになっている。FIG. 8 is a flow rate characteristic diagram of the control valve under the operating conditions of FIGS. 6 and 7. In this embodiment, the one outlet valve port 3c is changed from the fully closed state to the fully opened state by the first half rotation of the valve body, and is fully closed by the subsequent half rotation. Also,
Conversely, the other outlet valve port 3d is controlled to be fully open → fully closed → fully open.
【００２７】図９は、本発明の他の実施例３を示す弁体
の作動状態図である。この実施例では、弁座シート３の
軸心に対して異なった半径ｒ１の円周上には出口弁口３
ｃが設けられ、半径ｒ２ の円周上には出口弁口３ｄが
設けられている。なお、半径ｒ２ −ｒ１ ＝弁口径以上
にするのがよい。このように、１つの弁座シート上に複
数の出口弁口を設けるに際して、その弁口の位置を異な
った半径ｒ１ 、ｒ２ の円周上に設けることにより、同
じ数の弁口であれば弁体の回転領域（制御領域）を倍に
広げることができるため、各々の弁口における流量制御
の精度を高めることができる。FIG. 9 is an operation state diagram of a valve body showing another embodiment 3 of the present invention. In this embodiment, the outlet valve port 3 is on the circumference of radius r 1 which is different relative to the axis of the valve seat sheet 3
c is provided, the outlet valve port 3d is provided on the circumference of radius r 2. The radius r 2 -r 1 is preferably equal to or larger than the valve diameter. As described above, when providing a plurality of outlet valve ports on one valve seat, by providing the positions of the valve ports on the circumference of different radii r 1 and r 2 , the same number of valve ports can be provided. Since the rotation region (control region) of the valve element can be doubled, the accuracy of flow control at each valve port can be improved.
【００２８】図１０は、図９の作動条件における制御弁
の流量特性図であり、いずれの弁口も弁体の約１回転未
満の範囲、すなわち図２、図３、図６及び図７の形態に
比べて約２倍の長さの間で絞り制御される状態を示すも
のである。FIG. 10 is a graph showing the flow rate characteristics of the control valve under the operating conditions shown in FIG. 9. Each of the valve ports has a range of less than about one rotation of the valve body, that is, FIGS. 2, 3, 6 and 7. This shows a state in which the aperture control is performed for a length approximately twice as long as the form.
【００２９】[0029]
【発明の効果】以上のように、本発明は、ロータを使用
するステッピングモーター方式を採用し、ロータの回転
で一つの弁体を回転させ、弁体の１回転未満で制御部に
よってそれぞれの出口弁口３ｃ，３ｄの開度を任意に絞
り制御できるようにしたものであるから、従来のキャピ
ラリーチューブに比べてこまかい絞り制御ができ、また
キャピラリーチューブ及びそれにかかるロウ付けがいら
なくなり、コストダウンもできるといった非常に有効な
制御弁である。また、弁口の位置を異なった半径ｒ
１ 、ｒ２ の円周上に設けたものにおいては、弁体の回
転領域（制御領域）を倍に広げることができるため、各
々の弁口における流量制御の精度を高めることができ
る。As described above, the present invention employs a stepping motor system using a rotor, in which one valve element is rotated by rotation of the rotor, and each outlet is controlled by the control unit in less than one rotation of the valve element. Since the degree of opening of the valve ports 3c and 3d can be arbitrarily controlled, finer squeezing control can be performed as compared with the conventional capillary tube, and the capillary tube and brazing associated therewith are not required, and the cost can be reduced. This is a very effective control valve. In addition, the position of the valve port is changed to a different radius r.
1, in that provided on the circumference of r 2, it is possible to widen the valve body of the rotary region (control region) is doubled, it is possible to improve the accuracy of flow rate control in each of the valve port.
【図１】 本発明の実施例を示す制御弁の縦断面図。FIG. 1 is a longitudinal sectional view of a control valve showing an embodiment of the present invention.
【図２】 本発明の作動条件１の説明図。FIG. 2 is an explanatory diagram of an operating condition 1 of the present invention.
【図３】 本発明の作動条件２の説明図。。FIG. 3 is an explanatory diagram of an operating condition 2 of the present invention. .
【図４】 図３の、弁体の円弧状溝の展開図。FIG. 4 is a development view of an arc-shaped groove of the valve body in FIG. 3;
【図５】 図２と図３の作動条件における制御弁の流量
特性図。FIG. 5 is a flow rate characteristic diagram of the control valve under the operating conditions of FIGS. 2 and 3;
【図６】 本発明に係る他の実施例１を示す弁体の作動
状態図。FIG. 6 is an operation state diagram of a valve body showing another embodiment 1 according to the present invention.
【図７】 本発明に係る他の実施例２を示す弁体の作動
状態図。FIG. 7 is an operation state diagram of a valve body showing another embodiment 2 according to the present invention.
【図８】 図６と図７の作動条件のおける制御弁の流量
特性図。FIG. 8 is a flow characteristic diagram of the control valve under the operating conditions of FIGS. 6 and 7.
【図９】 本発明に係る他の実施例３を示す弁体の作動
状態図。FIG. 9 is an operation state diagram of a valve body showing another embodiment 3 according to the present invention.
【図１０】 図９の作動条件のおける制御弁の流量特性
図。FIG. 10 is a flow characteristic diagram of the control valve under the operating conditions of FIG. 9;
【図１１】 従来の冷蔵庫のサイクル図。FIG. 11 is a cycle diagram of a conventional refrigerator.
【図１２】 従来の制御弁の縦断面図。FIG. 12 is a longitudinal sectional view of a conventional control valve.
１ 密閉ケース、 １ａ 段、 １ｂ
軸受け部、２ コイル、 ３ 弁座シー
ト、 ３ａ 軸穴、３ｂ 入り口弁口、 ３ｃ
出口弁口、 ３ｄ 出口弁口、３ｅ 位置決め穴
４ シャフト、 ５ ロータ、５ａ係止部
５ｂ 当接部、 ６ 弁体、６ａ
回転伝達部 ６ｃ 制御部、 ６ｄ 円
弧状溝、６ｅ 流入口、 ７ ストッパー、
７ａ ストッパー部、７ｂ 位置決め片
８ 入り口通路、 ９ 出口通路、１０ 圧縮コイルば
ね。1 sealed case, 1a stage, 1b
Bearing part, 2 coils, 3 valve seat, 3a shaft hole, 3b inlet valve port, 3c
Outlet valve port, 3d Outlet valve port, 3e Positioning hole
Reference Signs List 4 shaft, 5 rotor, 5a locking part 5b contact part, 6 valve body, 6a
Rotation transmitting unit 6c control unit, 6d arc-shaped groove, 6e inflow port, 7 stopper,
7a stopper part, 7b positioning piece
8 Inlet passage, 9 Outlet passage, 10 Compression coil spring.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ テーマコート゛(参考） Ｆ２５Ｄ 11/02 Ｆ２５Ｄ 11/02 Ｆ ──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. 7 Identification symbol FI Theme coat ゛ (Reference) F25D 11/02 F25D 11/02 F
Claims (4)
下方を拡開させて段（１ａ）を設けてなる逆有底筒状の
密閉ケース(１)の外方にコイル(２)を配置させ、前記密
閉ケースの開口下端部には、中心部に軸穴(３ａ)を設
け、入り口通路(８)に連通する弁口(３ｂ)並び複数の出
口通路(９)に連通する複数の弁口(３ｃ) 、(３ｄ)を設
け、さらにストッパーの位置決め穴（３ｅ）を設けてな
る弁座シート(３)を気密的に固定し、 一方、上端部をケースの軸穴(１ｂ)で支持すると共に下
端部を弁座シートの軸穴(３ａ)にて支持させるようにし
たシャフト(４)には、圧縮コイルばね（１０）と、下端
部に弁体を回動させる係止部（５ａ）とストッパーに当
接する当接部(５ｂ)を備えたロータ(５)と、上方に前記
の係止部（５ａ）と当接する回転伝達部(６ａ)を備える
と共に下面に弁座シート(３)の出口弁口(３ｃ) 、(３
ｄ)の開度を絞り制御させる制御部（６ｃ）を備えた弁
体(６)を配置させ、前記のロータ(５)と弁体(６)とを圧
縮コイルばね（１０）により下方に付勢させ、 密閉ケース(１)に圧入固定されるストッパー（７）は、
断面が逆Ｕ字状のリングに形成され、その下方に前記ス
トッパーの位置決め穴（３ｅ）に嵌着される位置決め片
（７ｂ）を設けると共に、リングの内側上方には前記の
当接部(５ｂ)と係合するストッパー部（７ａ）を設け、 前記弁座シート（３）面上を、弁体(６)が１回転未満の
範囲で回転摺動することにより、出口通路(９)に連通す
る複数の弁口（３ｃ）、（３ｄ）の開度を絞り制御して
流路の切換並びに流量を制御するようにしたことを特徴
とする制御弁。A coil (2) is provided outside of an inverted bottomed cylindrical sealed case (1) provided with a bearing portion (1b) at an upper central portion and a step (1a) expanded at a lower portion. A shaft hole (3a) is provided at the center at the lower end of the opening of the sealed case, and a plurality of valve ports (3b) communicating with the inlet passage (8) and a plurality of outlet passages (9) are provided. The valve seat (3) provided with the valve openings (3c) and (3d) and the stopper positioning holes (3e) is hermetically fixed. On the other hand, the upper end portion is formed in the shaft hole (1b) of the case. The shaft (4), which is supported at the lower end by a shaft hole (3a) of the valve seat, has a compression coil spring (10) and a locking portion for rotating the valve body at the lower end. (5a) and a rotor (5) having a contact portion (5b) for contacting the stopper, and a rotation transmitting portion (6a) for contacting the locking portion (5a) above. And the outlet valve ports (3c), (3) of the valve seat (3) on the lower surface.
d) A valve body (6) provided with a control unit (6c) for restricting the opening degree is arranged, and the rotor (5) and the valve body (6) are attached downward by a compression coil spring (10). The stopper (7), which is press-fitted and fixed in the closed case (1),
A positioning piece (7b) fitted in a positioning hole (3e) of the stopper is provided below the ring having an inverted U-shaped cross section, and the abutting portion (5b) is provided above the inside of the ring. And a stopper portion (7a) which engages with the outlet seat (9) by rotating the valve body (6) on the surface of the valve seat (3) within a range of less than one rotation. A control valve characterized in that the opening degree of the plurality of valve ports (3c) and (3d) is controlled by restricting the opening degree of the plurality of valve ports (3c) and (3d) to switch the flow path and control the flow rate.
ｃ）、（３ｄ）をほぼ軸対象の位置に対向させて設ける
と共に、弁体の制御部（６ｃ）の形状をインボリュート
曲線のカム板形状等に形成し、弁体（６）の１回転未満
で各々の弁口（３ｃ）、（３ｄ）の開度を全閉から全開
の状態に制御できるようにしたことを特徴とする請求項
１記載の制御弁。2. A valve port (3) provided in a valve seat (3).
c) and (3d) are provided so as to be substantially opposed to the positions symmetrical with the axis, and the shape of the control section (6c) of the valve body is formed in a cam plate shape of an involute curve, etc., and less than one rotation of the valve body (6). The control valve according to claim 1, wherein the opening degree of each of the valve ports (3c) and (3d) can be controlled from a fully closed state to a fully opened state.
ｃ）、（３ｄ）をほぼ軸対象の位置に対向させて設ける
と共に、弁体の制御部（６ｃ）の形状を厚肉の円筒状に
形成し、前記制御部（６ｃ）の下面には約１８０°の範
囲に渡って流体通路の面積が漸増する円弧状溝(６ｄ)を
設けると共に、該円弧状溝(６ｄ)の流体通路の面積が最
大となる位置に流入口（６ｅ）を設け、弁体（６）の１
回転未満で各々の弁口（３ｃ）、（３ｄ）の開度を全閉
から全開の状態に制御できるようにしたことを特徴とす
る請求項１記載の制御弁。3. A valve port (3) provided in a valve seat (3).
c) and (3d) are provided so as to be substantially opposed to the axially symmetric positions, and the shape of the control part (6c) of the valve body is formed in a thick cylindrical shape. Providing an arc-shaped groove (6d) in which the area of the fluid passage gradually increases over a range of 180 °, and providing an inflow port (6e) at a position where the area of the fluid passage in the arc-shaped groove (6d) is maximum; 1 of the valve body (6)
2. The control valve according to claim 1, wherein the opening degree of each of the valve ports (3c) and (3d) can be controlled from a fully closed state to a fully opened state with less than rotation.
に対して弁口（３ｄ）の位置が、軸心に対して異なった
半径ｒの円周上に設けられたことを特徴とする請求項１
記載の制御弁。4. A valve port (3c) provided in a valve seat (3).
The position of the valve port (3d) is provided on a circumference having a different radius r with respect to the axis.
The control valve as described.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001076878A JP2001343076A (en) | 2000-03-30 | 2001-03-16 | Control valve |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000093583 | 2000-03-30 | ||
| JP2000-93583 | 2000-03-30 | ||
| JP2001076878A JP2001343076A (en) | 2000-03-30 | 2001-03-16 | Control valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2001343076A true JP2001343076A (en) | 2001-12-14 |
Family
ID=26588848
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001076878A Pending JP2001343076A (en) | 2000-03-30 | 2001-03-16 | Control valve |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2001343076A (en) |
Cited By (10)
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|---|---|---|---|---|
| JP2003207065A (en) * | 2002-01-15 | 2003-07-25 | Saginomiya Seisakusho Inc | Motor operated valve |
| WO2005052468A1 (en) * | 2003-11-28 | 2005-06-09 | Kabushiki Kaisha Toshiba | Refrigerator |
| JP2006153174A (en) * | 2004-11-30 | 2006-06-15 | Nidec Sankyo Corp | Linear drive device |
| JP2006153175A (en) * | 2004-11-30 | 2006-06-15 | Nidec Sankyo Corp | Linear drive device |
| CN102062236A (en) * | 2010-12-21 | 2011-05-18 | 李万红 | Constant pressure plane seal multiplex valve |
| WO2012083895A1 (en) * | 2010-12-21 | 2012-06-28 | Li Wanhong | Constant-pressure flat-seal multiplex valve |
| JP2015129625A (en) * | 2013-12-02 | 2015-07-16 | 三星電子株式会社Ｓａｍｓｕｎｇ Ｅｌｅｃｔｒｏｎｉｃｓ Ｃｏ．，Ｌｔｄ． | Cooling device |
| WO2018162294A1 (en) * | 2017-03-07 | 2018-09-13 | Robert Bosch Gmbh | Valve for controlling a fluid flow |
| CN110375081A (en) * | 2018-04-13 | 2019-10-25 | 浙江三花智能控制股份有限公司 | Valve gear and its valve block |
| CN113309879A (en) * | 2021-06-01 | 2021-08-27 | 南通华信中央空调有限公司 | Manifold type air three-way valve |
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2001
- 2001-03-16 JP JP2001076878A patent/JP2001343076A/en active Pending
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003207065A (en) * | 2002-01-15 | 2003-07-25 | Saginomiya Seisakusho Inc | Motor operated valve |
| WO2005052468A1 (en) * | 2003-11-28 | 2005-06-09 | Kabushiki Kaisha Toshiba | Refrigerator |
| KR100756725B1 (en) * | 2003-11-28 | 2007-09-07 | 가부시끼가이샤 도시바 | Refrigerator |
| CN100439816C (en) * | 2003-11-28 | 2008-12-03 | 株式会社东芝 | Refrigerator |
| US7770406B2 (en) | 2003-11-28 | 2010-08-10 | Kabushiki Kaisha Toshiba | Refrigerator |
| JP2006153174A (en) * | 2004-11-30 | 2006-06-15 | Nidec Sankyo Corp | Linear drive device |
| JP2006153175A (en) * | 2004-11-30 | 2006-06-15 | Nidec Sankyo Corp | Linear drive device |
| WO2012083895A1 (en) * | 2010-12-21 | 2012-06-28 | Li Wanhong | Constant-pressure flat-seal multiplex valve |
| CN102062236A (en) * | 2010-12-21 | 2011-05-18 | 李万红 | Constant pressure plane seal multiplex valve |
| JP2015129625A (en) * | 2013-12-02 | 2015-07-16 | 三星電子株式会社Ｓａｍｓｕｎｇ Ｅｌｅｃｔｒｏｎｉｃｓ Ｃｏ．，Ｌｔｄ． | Cooling device |
| WO2018162294A1 (en) * | 2017-03-07 | 2018-09-13 | Robert Bosch Gmbh | Valve for controlling a fluid flow |
| CN110431365A (en) * | 2017-03-07 | 2019-11-08 | 罗伯特·博世有限公司 | For controlling the valve of fluid stream |
| CN110431365B (en) * | 2017-03-07 | 2021-11-16 | 罗伯特·博世有限公司 | Valve for controlling fluid flow |
| US11466786B2 (en) | 2017-03-07 | 2022-10-11 | Robert Bosch Gmbh | Valve for controlling a fluid flow |
| CN110375081A (en) * | 2018-04-13 | 2019-10-25 | 浙江三花智能控制股份有限公司 | Valve gear and its valve block |
| CN113309879A (en) * | 2021-06-01 | 2021-08-27 | 南通华信中央空调有限公司 | Manifold type air three-way valve |
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