JPH11325661A - Expansion valve - Google Patents
Expansion valveInfo
- Publication number
- JPH11325661A JPH11325661A JP10139344A JP13934498A JPH11325661A JP H11325661 A JPH11325661 A JP H11325661A JP 10139344 A JP10139344 A JP 10139344A JP 13934498 A JP13934498 A JP 13934498A JP H11325661 A JPH11325661 A JP H11325661A
- Authority
- JP
- Japan
- Prior art keywords
- expansion valve
- adjusting screw
- refrigerant
- valve body
- orifice
- 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
- F25B2341/00—Details of ejectors not being used as compression device; Details of flow restrictors or expansion valves
- F25B2341/06—Details of flow restrictors or expansion valves
- F25B2341/068—Expansion valves combined with a sensor
- F25B2341/0683—Expansion valves combined with a sensor the sensor is disposed in the suction line and influenced by the temperature or the pressure of the suction gas
Landscapes
- Temperature-Responsive Valves (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は空気調和装置、冷凍
装置などに用いられ、冷媒の流量を制御する膨張弁に関
する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an expansion valve used for an air conditioner, a refrigeration system, etc., for controlling a flow rate of a refrigerant.
【０００２】[0002]
【従来の技術】従来広く用いられているボックス型膨張
弁を自動車等の空気調和装置の冷凍サイクル中に配置し
た状態の縦断面図を図３に、またそのＡ方向から見た概
略斜視図を図４に示す。図３及び図４において、膨張弁
１０は角柱の例えばアルミニウム製の弁本体３０と、冷
媒サイクル１１においてコンデンサ５、レシーバ６から
エバポレータ８に向かう冷媒の通る第一の通路３２、及
びエバポレータ８からコンプレッサ４に向かう冷媒の通
る第二の通路３４が弁本体３０に上下に離間して形成さ
れている。さらに、第一の通路３２に設けられたオリフ
ィス３２ａ及び弁室３５と、このオリフィス３２ａを通
過する冷媒量を制御する通路３２の上流側に配置された
球状の弁体３２ｂと、弁体３２ｂをオリフィス３２ａ方
向に弁部材３２ｃを介して押圧するばね３２ｄの調節ね
じ３９を有する。調節ねじ３９は弁本体３０の下部の端
面より第一の通路３２の弁室３５に連通する装着穴３０
ａに進退可能にねじ込まれており、Ｏリング３９ａが調
節ねじ３９に装着され、弁本体３０と気密状態が確保さ
れている。この調節ねじ３９と押圧ばね３２ｄとによ
り、弁体３２ｂのオリフィス３２ａに対する開口度が調
節される。2. Description of the Related Art FIG. 3 is a longitudinal sectional view showing a state in which a box-type expansion valve which has been widely used in the past is arranged in a refrigeration cycle of an air conditioner of an automobile or the like, and a schematic perspective view thereof as viewed from a direction A. As shown in FIG. 3 and 4, the expansion valve 10 has a prismatic valve body 30 made of, for example, aluminum, a condenser 5 in the refrigerant cycle 11, a first passage 32 through which refrigerant flows from the receiver 6 to the evaporator 8, and a compressor from the evaporator 8 to the compressor. A second passage 34 through which the refrigerant flowing toward 4 passes is formed in the valve body 30 so as to be vertically separated. Further, an orifice 32a and a valve chamber 35 provided in the first passage 32, a spherical valve body 32b disposed upstream of the passage 32 that controls the amount of refrigerant passing through the orifice 32a, and a valve body 32b The spring 32d has an adjusting screw 39 for pressing the spring 32d in the direction of the orifice 32a via the valve member 32c. The adjusting screw 39 is provided in the mounting hole 30 communicating with the valve chamber 35 of the first passage 32 from the lower end face of the valve body 30.
The O-ring 39a is mounted on the adjusting screw 39 so that the valve body 30 is airtightly sealed. The opening degree of the valve body 32b with respect to the orifice 32a is adjusted by the adjusting screw 39 and the pressing spring 32d.
【０００３】なお、３２１はレシーバ６から送り出され
て、エバポレータ８に向かう冷媒が流入する入口ポート
であり、入口ポート３２１に弁室３５が連続しており、
３２２はエバポレータ８に流入する冷媒の出口ポートで
ある。また、図４において、５０は膨張弁を取り付ける
ためのボルト孔であり、弁本体３０の下部は薄肉化され
ている。弁本体３０にはエバポレータ８の出口温度に応
じて、弁体３２ｂに対して駆動力を与えてオリフィス３
２ａの開閉を行うために小径の孔３７と、この孔３７よ
り径が大径の孔３８が、第２の通路３４を貫通してオリ
フィス３２ａと同軸に形成され、弁本体３０の上端には
感熱部となるパワーエレメント部３６が固定されるねじ
孔３６１が形成されている。[0003] Reference numeral 321 denotes an inlet port through which the refrigerant sent out from the receiver 6 and flowing toward the evaporator 8 flows, and the valve chamber 35 is continuous with the inlet port 321.
322 is an outlet port for the refrigerant flowing into the evaporator 8. In FIG. 4, reference numeral 50 denotes a bolt hole for attaching an expansion valve, and the lower portion of the valve body 30 is thinned. A driving force is applied to the valve body 30 to the valve body 32b in accordance with the outlet temperature of the evaporator 8 so that the orifice 3
A hole 37 having a smaller diameter and a hole 38 having a larger diameter than the hole 37 are formed coaxially with the orifice 32a through the second passage 34 at the upper end of the valve body 30 to open and close the valve body 2a. A screw hole 361 to which the power element portion 36 serving as a heat sensitive portion is fixed is formed.
【０００４】パワーエレメント部３６は、ステンレス製
のダイアフラム３６ａと、このダイアフラム３６ａを挾
んで互いに溶接により密着して設けられ、その上下に二
つの気密な感温室を形成する上部圧力作動室３６ｂ、及
び下部圧力作動室３６ｃをそれぞれ構成する上カバー３
６ｄと下カバー３６ｈと、上部圧力作動室３６ｂにダイ
アフラム駆動流体となる所定冷媒を封入するための封切
管３６ｉとを備え、下カバー３６ｈはパッキン４０を介
してねじ孔３６１に螺着される。下部圧力作動室３６ｃ
は、オリフィス３２ａの中心線に対して、同心的に形成
された均圧孔３６ｅを介して第２の通路３４に連通され
ている。第２の通路３４には、エバポレータ８からの冷
媒蒸気が流れ、通路３４は気相冷媒の通路となり、その
冷媒蒸気の圧力が均圧孔３６ｅを介して下部圧力作動室
３６ｃに負荷されている。なお、３４２はエバポレータ
８から送り出される冷媒の入る入口ポート、３４１はコ
ンプレッサ４へ送り出される冷媒の出口となる出口ポー
トである。また、図４では、封切管３６ｉを省略して示
している。The power element section 36 is provided with a stainless steel diaphragm 36a and an upper pressure working chamber 36b which is provided in close contact with each other with the diaphragm 36a therebetween by welding and forms two airtight temperature sensing chambers above and below the diaphragm. Upper cover 3 which constitutes each lower pressure working chamber 36c
6d, a lower cover 36h, and a sealing tube 36i for sealing a predetermined refrigerant serving as a diaphragm driving fluid in the upper pressure working chamber 36b. The lower cover 36h is screwed into the screw hole 361 via the packing 40. Lower pressure working chamber 36c
Is connected to the second passage 34 via a pressure equalizing hole 36e formed concentrically with the center line of the orifice 32a. Refrigerant vapor from the evaporator 8 flows through the second passage 34, and the passage 34 serves as a passage for a gas-phase refrigerant, and the pressure of the refrigerant vapor is applied to the lower pressure working chamber 36c via the equalizing hole 36e. . In addition, 342 is an inlet port into which the refrigerant sent from the evaporator 8 enters, and 341 is an outlet port as an outlet of the refrigerant sent to the compressor 4. In FIG. 4, the sealing tube 36i is omitted.
【０００５】さらに下部圧力作動室３６ｃ内にダイアフ
ラム３６ａの下面中央部に当接する大径の皿状に形成さ
れた頂部３７ｇを有し、かつ第２の通路３４を貫通して
大径の孔３８内に摺動可能に配置されて、エバポレータ
８の冷媒出口温度を下部圧力作動室３６ｃへ伝達すると
共に、上部圧力作動室３６ｂ及び下部圧力作動室３６ｃ
の圧力差に伴うダイアフラム３６ａの変位に応じて、大
径３８内を摺動して駆動力を与えるアルミ製の感温棒３
６ｆと、小径の孔３７内に摺動可能に配置されて、感温
棒３６ｆの変位に応じて弁体３２ｂを付勢手段３２ｄの
弾性力に抗して押圧する感温棒３６ｆより細径のステン
レス製の作動棒３７ｆからなり、感温棒３６ｆの頂部３
７ｇは、ダイアフラム３６ａの受け部としてダイアフラ
ム３６ａの下面に当接し、感温棒３６ｆの下端は作動棒
３７ｆの上端と当接し、作動棒３７ｆの下端は弁体３２
ｂと当接しており、感温棒３６ｆと作動棒３７ｆとで弁
体駆動棒が構成されている。Further, the lower pressure working chamber 36c has a large-diameter dish-shaped top portion 37g in contact with the center of the lower surface of the diaphragm 36a, and the large-diameter hole 38 penetrates through the second passage 34. And slidably disposed therein, to transmit the refrigerant outlet temperature of the evaporator 8 to the lower pressure operating chamber 36c, and also to transmit the refrigerant pressure to the upper pressure operating chamber 36b and the lower pressure operating chamber 36c.
The aluminum temperature sensing rod 3 that slides in the large diameter 38 to provide a driving force in accordance with the displacement of the diaphragm 36a due to the pressure difference
6f and a smaller diameter than the temperature sensing rod 36f which is slidably disposed in the small diameter hole 37 and presses the valve body 32b against the elastic force of the urging means 32d according to the displacement of the temperature sensing rod 36f. Of the temperature sensing rod 36f.
7g contacts the lower surface of the diaphragm 36a as a receiving portion of the diaphragm 36a, the lower end of the temperature sensing rod 36f contacts the upper end of the operating rod 37f, and the lower end of the operating rod 37f is
b, and the valve drive rod is constituted by the temperature sensing rod 36f and the operating rod 37f.
【０００６】したがって、均圧孔３６ｅには、ダイアフ
ラム３６ａの下面から第１の通路３２のオリフィス３２
ａまで延出した弁体駆動棒が、同心的に配置されている
ことになる。なお、作動棒３７ｆの部分３７ｅは、オリ
フィス３２ａの内径より細く形成されて、オリフィス３
２ａ内を挿通し、冷媒はオリフィス３２ａ内を通過す
る。また、感温棒３６ｆには第１の通路３２と、第２の
通路３４との気密性を確保するための密封部材としてＯ
リング３６ｇが備えられている。Therefore, the orifice 32 of the first passage 32 is inserted into the pressure equalizing hole 36e from the lower surface of the diaphragm 36a.
That is, the valve body drive rod extending to a is concentrically arranged. The portion 37e of the operating rod 37f is formed thinner than the inner diameter of the orifice 32a.
The refrigerant passes through the inside of the orifice 32a. Further, the temperature sensing rod 36f has an O as a sealing member for ensuring airtightness between the first passage 32 and the second passage 34.
A ring 36g is provided.
【０００７】圧力作動ハウジング３６ｄの上方の圧力作
動室３６ｂ中には、公知のダイアフラム駆動流体が充填
されていて、ダイアフラム駆動流体には第２の通路３４
や第２の通路３４に連通されている均圧孔３６ｅに露出
された弁体駆動棒及びダイアフラム３６ａを介して、第
２の通路３４を流れているエバポレータ８の冷媒出口か
らの冷媒の熱が伝達される。A known diaphragm driving fluid is filled in the pressure operating chamber 36b above the pressure operating housing 36d, and a second passage 34 is provided in the diaphragm driving fluid.
And the heat of the refrigerant from the refrigerant outlet of the evaporator 8 flowing through the second passage 34 through the valve drive rod and the diaphragm 36a exposed to the pressure equalizing hole 36e communicating with the second passage 34. Is transmitted.
【０００８】上方の圧力作動室３６ｂ中のダイアフラム
駆動流体は、上記伝達された熱に対応してガス化し、圧
力をダイアフラム３６ａの上面に負荷する。ダイアフラ
ム３６ａは上記上面に負荷されたダイアフラム駆動ガス
の圧力と、ダイアフラム３６ａの下面に負荷された圧力
との差により上下に変位する。ダイアフラム３６ａの中
心部の上下への変位は、弁体駆動棒を介して弁体３２ｂ
に伝達され弁体３２ｂをオリフィス３２ａの弁座に対し
て接近または離間させる。この結果、冷媒流量が制御さ
れることとなる。[0008] The diaphragm driving fluid in the upper pressure working chamber 36b gasifies in response to the transferred heat, and applies pressure to the upper surface of the diaphragm 36a. The diaphragm 36a is displaced up and down due to the difference between the pressure of the diaphragm driving gas applied to the upper surface and the pressure applied to the lower surface of the diaphragm 36a. The displacement of the center of the diaphragm 36a up and down is controlled by the valve body 32b via the valve body drive rod.
To move the valve body 32b toward or away from the valve seat of the orifice 32a. As a result, the flow rate of the refrigerant is controlled.
【０００９】即ち、エバポレータ８の出口側つまりエバ
ポレータから送り出される低圧の気相冷媒の温度が上部
圧力作動室３６ｂに伝達されるため、その温度に応じて
上部圧力作動室３６ｂの圧力が変化し、エバポレータ８
の出口温度が上昇する。つまりエバポレータの熱負荷が
増加すると、上部圧力作動室８６ｂの圧力が高くなり、
それに応じて感温棒３６ｆつまり弁体駆動棒が下方へ駆
動されて弁体３２ｂを下げるため、オリフィス３２ａの
開度が大きくなる。これによりエバポレータ８への冷媒
の供給量が多くなり、エバポレータ８の温度を低下させ
る。逆に、エバポレータ８から送り出される冷媒の温度
が低下する。つまりエバポレータの熱負荷が減少する
と、弁体３２ｂが上記と逆方向に駆動され、オリフィス
３２ａの開度が小さくなり、エバポレータへの冷媒の供
給量が少なくなり、エバポレータ８の温度を上昇させる
のである。That is, since the temperature of the low-pressure gas-phase refrigerant sent from the outlet side of the evaporator 8, that is, from the evaporator, is transmitted to the upper pressure working chamber 36b, the pressure of the upper pressure working chamber 36b changes according to the temperature. Evaporator 8
Outlet temperature rises. That is, when the heat load of the evaporator increases, the pressure of the upper pressure working chamber 86b increases,
Accordingly, the temperature sensing rod 36f, that is, the valve body drive rod is driven downward to lower the valve body 32b, so that the opening degree of the orifice 32a increases. Thus, the supply amount of the refrigerant to the evaporator 8 increases, and the temperature of the evaporator 8 decreases. Conversely, the temperature of the refrigerant sent from the evaporator 8 decreases. That is, when the heat load of the evaporator decreases, the valve element 32b is driven in the opposite direction to the above, the opening degree of the orifice 32a decreases, the supply amount of the refrigerant to the evaporator decreases, and the temperature of the evaporator 8 increases. .
【００１０】さらに、従来の膨張弁として、図３に示す
封切管３６ｉの代りに、図５に示す如く、栓体３６ｋを
用いて所定冷媒を封入したものも知られており、例えば
ステンレス製の栓体３６ｋが、ステンレス製の上カバー
３６ｄに形成された穴３６ｊを塞ぐように挿入され、栓
体３６ｋは穴３６ｊに溶接により固着されているのであ
る。[0010] Further, as a conventional expansion valve, a type in which a predetermined refrigerant is sealed using a plug 36k as shown in FIG. 5 instead of the sealing tube 36i shown in FIG. 3 is known. The plug 36k is inserted so as to close the hole 36j formed in the stainless steel upper cover 36d, and the plug 36k is fixed to the hole 36j by welding.
【００１１】かかる図５の従来の膨張弁１０’において
は、パワーエレメント部３６’における所定冷媒の封入
が栓体３６ｋにより行われている点が、図４の膨張弁と
異なるのみであり、他の構成は図４と同一であるので、
同一または均等部分には同一の符号を付して説明を省略
している。なお、図５においては、冷凍サイクルを省略
して示している。The conventional expansion valve 10 'of FIG. 5 differs from the expansion valve of FIG. 4 only in that a predetermined refrigerant is sealed in the power element portion 36' by a plug 36k. Is the same as that of FIG.
The same or equivalent parts are denoted by the same reference numerals and description thereof is omitted. In FIG. 5, the refrigeration cycle is omitted.
【００１２】而して、従来の図３及び図５に示す膨張弁
においては、調節ねじ３９は、金属製例えばアルミニウ
ム製であり、図６（ａ）及び図６（ｂ）に示す斜視図の
如く略円筒形状をなし、弁本体３０の装着穴３０ａに進
退可能にねじ込まれるための外周部に形成されたねじ部
３９ｂと、Ｏリング３９ａが装着される溝部３９ｃと、
ねじ部３９ｂと溝部３９ｃとの間に形成された段部３９
ｄと、押圧ばね３２ｄの下端部が挿入される開口部３９
ｅと、開口部３９ｅに挿入されたばね３２ｄの端部を支
持する支持部３９ｆと、調節ねじの底部をなす端部３９
ｇの中央部に形成された六角穴３９ｈとからなり、六角
穴３９ｈは工具の係合部として作用し、この穴に工具、
例えば六角レンチを挿入することによって調節ねじ３９
を弁本体３０に螺合させるのである。この工具の係合部
は、六角穴のほかに種々の形状が選択できる。また、調
節ねじ３９は、開口部３９ｅ側がねじ部３９ｂ側より径
小となる如く略円筒形状に形成されて、溝部３９ｃにＯ
リング３９ａが装着されている。なお、図６（ａ）及び
図６（ｂ）は、それぞれ開口部３９ｅ及び底部３９ｇの
方向から見た斜視図である。In the conventional expansion valve shown in FIGS. 3 and 5, the adjusting screw 39 is made of metal, for example, aluminum, and the adjusting screw 39 is made of a perspective view shown in FIGS. 6 (a) and 6 (b). It has a substantially cylindrical shape as described above, a screw portion 39b formed on an outer peripheral portion for being screwed into the mounting hole 30a of the valve body 30 so as to be able to advance and retreat, and a groove portion 39c to which the O-ring 39a is mounted.
Step 39 formed between screw 39b and groove 39c
d and an opening 39 into which the lower end of the pressing spring 32d is inserted.
e, a support 39f for supporting the end of the spring 32d inserted into the opening 39e, and an end 39 forming the bottom of the adjusting screw.
g of a hexagonal hole 39h formed in the center of the g. The hexagonal hole 39h acts as an engagement portion of the tool.
For example, by inserting a hex wrench,
Is screwed into the valve body 30. Various shapes other than a hexagonal hole can be selected for the engaging portion of the tool. The adjusting screw 39 is formed in a substantially cylindrical shape so that the diameter of the opening 39e is smaller than the diameter of the screw 39b.
A ring 39a is mounted. FIGS. 6A and 6B are perspective views seen from the direction of the opening 39e and the bottom 39g, respectively.
【００１３】[0013]
【発明が解決しようとする課題】ところで、従来の膨張
弁において、軽量化、加工工数の低減化のため、調節ね
じ３９をアルミ合金から樹脂にすることが考えられる。
しかしながら、従来の調節ねじを樹脂にした場合には、
その形状に肉厚部また肉薄部が存在する。即ち、上記溝
部近傍は肉薄部であり、工具の係合部近傍は肉厚部であ
るという所謂偏肉部の形状となり、樹脂の成形後の冷却
速度の差が生じ、形状の寸法にバラツキが発生するとい
う問題がある。この寸法バラツキは、特に調節ねじの外
周に形成されたねじ部においては、調節不能となること
も生じる。本発明は、上記のような問題点に鑑みなされ
たもので、その目的とするところは、膨張弁の調節ねじ
の樹脂化に際し、偏肉部を低減し、安価で軽量化された
膨張弁を提供することにある。By the way, in the conventional expansion valve, it is conceivable that the adjusting screw 39 is made of resin from aluminum alloy in order to reduce the weight and the number of processing steps.
However, when the conventional adjusting screw is made of resin,
The shape has a thick part or a thin part. That is, the vicinity of the groove portion is a thin portion, and the vicinity of the engagement portion of the tool is a thick portion, that is, a so-called uneven thickness portion, which causes a difference in cooling rate after molding of the resin, and the size of the shape varies. There is a problem that occurs. This dimensional variation may not be able to be adjusted, especially in a thread portion formed on the outer periphery of the adjusting screw. The present invention has been made in view of the above-described problems, and an object of the present invention is to provide an inexpensive and lightweight expansion valve that reduces uneven thickness portions when resinizing an adjustment screw of the expansion valve. To provide.
【００１４】[0014]
【課題を解決するための手段】前記の目的を達成すべ
く、本発明に係る膨張弁は、エバポレータから送り出さ
れる冷媒の温度変化により、感温室内に封入された冷媒
により弁体のオリフィスに対する開口度を制御する膨張
弁において、上記弁体の開口度を調節する調節ねじが樹
脂製であると共に、上記樹脂の偏肉部を減少させる手段
を具備していることを特徴とする。また、本発明に係る
膨張弁は、上記手段が、上記調整ねじの端部に形成され
た凹部であることを特徴とする。In order to achieve the above-mentioned object, an expansion valve according to the present invention is provided with an opening to an orifice of a valve element due to a change in temperature of a refrigerant discharged from an evaporator by a refrigerant sealed in a temperature-sensitive chamber. The expansion valve for controlling the degree is characterized in that the adjusting screw for adjusting the opening degree of the valve body is made of resin and is provided with means for reducing the uneven thickness portion of the resin. The expansion valve according to the present invention is characterized in that the means is a concave portion formed at an end of the adjusting screw.
【００１５】さらに本発明に係る膨張弁は、レシーバか
らエバポレータに向かう冷媒の通る第一の通路及びエバ
ポレータからコンプレッサに向かう冷媒の通る第二の通
路を有する弁本体の上端部に設けられた感温室内のダイ
アフラムの変位に応じて弁体を駆動すると共に、上記弁
体の開口度を調節する圧縮ばねの押圧力を調整する調整
ねじを進退可能に上記弁本体の下端部に取り付けた温度
膨張弁において、上記調整ねじが樹脂製であると共に、
その端部に形成された凹部を有し、上記凹部内に所定工
具の係合部を具備していることを特徴とする。Further, an expansion valve according to the present invention is a temperature sensing chamber provided at an upper end of a valve body having a first passage through which a refrigerant flows from a receiver to an evaporator and a second passage through which a refrigerant flows from an evaporator to a compressor. A temperature expansion valve, which drives a valve body in accordance with the displacement of a diaphragm in the inside and adjusts an adjusting screw for adjusting a pressing force of a compression spring for adjusting an opening degree of the valve body so as to advance and retreat to a lower end portion of the valve body. In the above, the adjusting screw is made of resin,
It has a recess formed at the end thereof, and is provided with an engagement portion for a predetermined tool in the recess.
【００１６】さらにまた本発明に係る膨張弁は、上記樹
脂がグラスファイバ入りポリフェニリンサルファイドで
あることを特徴とする。従って、本発明によれば、樹脂
製の調節ねじに偏肉部を低減させる手段を具備したの
で、偏肉部を最少限にとどめることが可能となり、成形
後の寸法バラツキが減少し、成形精度の向上を図ること
ができ、かつ軽量で安価な膨張弁とすることができる。
また、本発明によれば、膨張弁は樹脂製の調節ねじの偏
肉部が、その端部に設けた凹部により低減されるので、
簡単な構成で安価に製造することができる。Still further, an expansion valve according to the present invention is characterized in that the resin is polyphenylene sulfide containing glass fiber. Therefore, according to the present invention, since the resin adjustment screw is provided with a means for reducing the uneven thickness portion, the uneven thickness portion can be minimized, the dimensional variation after molding is reduced, and the molding accuracy is reduced. And an expansion valve that is lightweight and inexpensive.
Further, according to the present invention, since the uneven thickness portion of the resin adjustment screw is reduced by the concave portion provided at the end of the expansion valve,
It can be manufactured at a low cost with a simple configuration.
【００１７】[0017]
【発明の実施の形態】以下、本発明の実施の形態を図面
に基づいて説明する。図１は、本発明に係る一実施の形
態の膨張弁の構成を示す断面図であり、図５に示す従来
の膨張弁１０’とは調節ねじ３９１が異なるのみであ
り、他の構成は図５と同一であり、同一の機能を奏する
ので、同一又は均等部分には同じ符号を付して説明を省
略する。図１の膨張弁１０１において、３９１は樹脂
製、例えばグラスファイバー入りポリフェニリンサルフ
ァイト製の調節ねじであり、この調節ねじ３９１は図２
（ａ）及び図２（ｂ）に示す斜視図の如く略円筒形状を
なし、図１の膨張弁１０１の弁本体３０の装置穴３０ａ
に進退可能に螺着されている。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view showing a configuration of an expansion valve according to an embodiment of the present invention. Only the adjustment screw 391 is different from the conventional expansion valve 10 ′ shown in FIG. 5, the same or equivalent parts are denoted by the same reference numerals and description thereof is omitted. In the expansion valve 101 of FIG. 1, reference numeral 391 denotes an adjustment screw made of resin, for example, polyphenylene sulfide containing glass fiber.
As shown in the perspective views of FIGS. 2 (a) and 2 (b), it has a substantially cylindrical shape, and the device hole 30a of the valve body 30 of the expansion valve 101 of FIG.
It is screwed so that it can advance and retreat.
【００１８】図２において、調節ねじ３９１は、その外
周部にねじ部３９１ｂと、Ｏリング３９ａが装置される
溝部３９１ｃと、ねじ部３９１ｂと溝部３９１ｃとの間
に形成された段部３９１ｄを有する。調整ねじ３９１の
一方の端部は、押圧ばね３２ｄの下端部が挿入される開
口部３９１ｅと、開口部３９１ｅに挿入された押圧ばね
３２ｄの端部を支持する支持部３９１ｆを有する。調整
ねじ３９１の他端部は、調節ねじ３９１の底部をなす端
部３９１ｇに形成された凹部３９１ｈと、この凹部３９
１ｈの底部３９１ｉ（図１に示す）に形成された内部の
角穴、例えば六角穴３９１ｊとを有し、六角穴３９１ｊ
は工具の係合部として作用し、六角穴３９１ｊに六角レ
ンチが係合し、調節ねじ３９１が回転操作され、弁本体
３００の装着穴３０ａ内を上下動する。かくして、調節
ねじ３９１に凹部３９１ｈが形成されることにより、凹
部３９１ｈは樹脂製の調節ねじ３９１の偏肉部を減少さ
せる手段となり、特に六角穴３９１ｊの係合部近傍にお
いては肉薄部に形成されるので、樹脂製調節ねじ３９１
の所謂偏肉部は減少されることとなる。この結果、樹脂
製調節ねじ３９１を、全体として偏肉部の減少した構成
とすることができる。なお、図２（ａ）及び図２（ｂ）
はそれぞれ開口部３９１ｅ及び底部３９１ｇの方向から
見た斜視図である。In FIG. 2, the adjusting screw 391 has a screw portion 391b, a groove portion 391c in which the O-ring 39a is provided, and a step portion 391d formed between the screw portion 391b and the groove portion 391c on its outer peripheral portion. . One end of the adjusting screw 391 has an opening 391e into which the lower end of the pressing spring 32d is inserted, and a support 391f that supports the end of the pressing spring 32d inserted into the opening 391e. The other end of the adjusting screw 391 has a concave portion 391h formed at an end portion 391g serving as a bottom of the adjusting screw 391, and a concave portion 391h.
1h has an internal square hole formed in a bottom portion 391i (shown in FIG. 1), for example, a hexagonal hole 391j.
Acts as an engagement portion of a tool, a hexagon wrench engages with the hexagonal hole 391j, the adjusting screw 391 is rotated, and moves up and down in the mounting hole 30a of the valve body 300. Thus, by forming the concave portion 391h in the adjusting screw 391, the concave portion 391h becomes a means for reducing the uneven thickness portion of the resin adjusting screw 391, and is particularly formed in a thin portion near the engaging portion of the hexagonal hole 391j. Therefore, the adjustment screw 391 made of resin
The so-called uneven thickness portion is reduced. As a result, the resin adjustment screw 391 can be configured to have a reduced thickness uneven portion as a whole. 2 (a) and 2 (b).
Are perspective views seen from the directions of the opening 391e and the bottom 391g, respectively.
【００１９】かかる樹脂製の調節ねじ３９１と押圧ばね
３２ｄとにより、図１の膨張弁１０１のオリフィス３２
ａに対する開口度が調節されるのであり、膨張弁１０１
は、従来の膨張弁１０’と同じ機能を奏することにな
る。The orifice 32 of the expansion valve 101 shown in FIG. 1 is formed by the resin adjusting screw 391 and the pressing spring 32d.
The opening degree with respect to a is adjusted.
Has the same function as the conventional expansion valve 10 '.
【００２０】以上のように、本実施の形態によれば、樹
脂製の調節ねじ３９１において、偏肉部を減少せしめた
構成にしたので、樹脂の成形後の冷却速度の差が生じ難
く、寸法バラツキを低減でき、安価で軽量化された膨張
弁とすることができる。さらに、樹脂製の調節ねじを用
いた膨張弁にあって、従来の膨張弁と同様に精度良くオ
リフィス３２ａに対する開口度を調節できる。As described above, according to the present embodiment, the resin adjustment screw 391 has a configuration in which the uneven thickness portion is reduced, so that a difference in cooling rate after molding of the resin hardly occurs. Variation can be reduced, and an inexpensive and lightweight expansion valve can be obtained. Further, in an expansion valve using a resin adjustment screw, the degree of opening with respect to the orifice 32a can be adjusted with high accuracy as in a conventional expansion valve.
【００２１】また、本実施の形態では、図５に示す従来
の膨張弁１０’を用いて説明したが、本発明は、図３に
示す従来の膨張弁１０において調節ねじ３９を図２に示
す如く、樹脂製の調節ねじに偏肉部を低減させる手段を
具備せしめ、調節ねじに偏肉部を減少せしめた構成とす
ることができるのは勿論である。Although the present embodiment has been described using the conventional expansion valve 10 'shown in FIG. 5, in the present invention, the adjusting screw 39 in the conventional expansion valve 10 shown in FIG. 3 is shown in FIG. As described above, it is a matter of course that the resin adjusting screw may be provided with a means for reducing the uneven thickness portion, and the adjusting screw may be reduced in the uneven thickness portion.
【００２２】[0022]
【発明の効果】以上説明したことから明らかなように、
本発明の膨張弁は、調節ねじを樹脂製とすると共に、そ
の偏肉部を減少させる手段を具備せしめたので、偏肉部
の低減した樹脂製の調節ねじにより膨張弁を構成できる
こととなり、軽量化が可能となると共に安価に製造でき
る。また、成形後の温度冷却の速度が各部で等しくなる
ので、樹脂製の調節ねじを用いても製品の寸法精度を向
上させることができる。したがって、樹脂製の調節ねじ
を用いた膨張弁にあって、調節ねじの偏肉部を減少させ
て寸法バラツキを低減したので、精度良くオリフィスの
開口度を調節できる。As is apparent from the above description,
The expansion valve of the present invention is made of a resin adjustment screw, and is provided with a means for reducing the uneven thickness portion. Therefore, the expansion valve can be formed by the resin adjustment screw having a reduced uneven thickness portion, and the light weight is reduced. In addition, it can be manufactured at a low cost. In addition, since the rate of temperature cooling after molding becomes equal in each part, the dimensional accuracy of the product can be improved even if a resin adjustment screw is used. Therefore, in the expansion valve using the adjusting screw made of resin, since the uneven thickness of the adjusting screw is reduced to reduce the dimensional variation, the opening degree of the orifice can be adjusted with high accuracy.
【図１】本発明に係る一実施の形態の膨張弁の構成を示
す断面図。FIG. 1 is a sectional view showing a configuration of an expansion valve according to an embodiment of the present invention.
【図２】図１の膨張弁の調節ねじの構造を示すもので、
（ａ）は開口部から見た斜視図、（ｂ）は底部から見た
斜視図。FIG. 2 shows the structure of an adjusting screw of the expansion valve of FIG. 1;
(A) is a perspective view seen from an opening, and (b) is a perspective view seen from a bottom.
【図３】従来の膨張弁の構成を示す断面図。FIG. 3 is a cross-sectional view showing a configuration of a conventional expansion valve.
【図４】図３の膨張弁の概略斜視図。FIG. 4 is a schematic perspective view of the expansion valve of FIG. 3;
【図５】従来の他の膨張弁の構成を示す断面図。FIG. 5 is a sectional view showing the configuration of another conventional expansion valve.
【図６】図３及び図５の膨張弁の調節ねじの構造を示す
もので、（ａ）は開口部から見た斜視図、（ｂ）は底部
から見た斜視図。6A and 6B show the structure of an adjusting screw of the expansion valve of FIGS. 3 and 5, wherein FIG. 6A is a perspective view as viewed from an opening, and FIG. 6B is a perspective view as viewed from a bottom.
３９１ 調節ねじ ３９１ｂ ねじ部 ３９１ｃ 溝部 ３９１ｅ 開口部 ３９１ｈ 凹部 ３９１ｊ 角穴 391 Adjusting screw 391b Screw part 391c Groove part 391e Opening part 391h Concave part 391j Square hole
Claims (4)
度変化により、感温室内に封入された冷媒により弁体の
オリフィスに対する開口度を制御する膨張弁において、
上記弁体の開口度を調節する調節ねじが樹脂製であると
共に、上記樹脂の偏肉部を減少させる手段を具備してい
ることを特徴とする膨張弁。An expansion valve for controlling an opening degree of a valve body to an orifice by a refrigerant sealed in a temperature-sensitive chamber by a change in temperature of a refrigerant sent from an evaporator.
An expansion valve, characterized in that an adjusting screw for adjusting the opening degree of the valve body is made of resin, and is provided with means for reducing the uneven thickness portion of the resin.
された凹部であることを特徴とする請求項１記載の膨張
弁。2. The expansion valve according to claim 1, wherein said means is a recess formed at an end of said adjusting screw.
の通る第一の通路及びエバポレータからコンプレッサに
向かう冷媒の通る第二の通路を有する弁本体の上端部に
設けられた感温室内のダイアフラムの変位に応じて弁体
を駆動すると共に、上記弁体の開口度を調節する圧縮ば
ねの押圧力を調整する調整ねじを進退可能に上記弁本体
の下端部に取り付けた温度膨張弁において、 上記調整ねじが樹脂製であると共に、その端部に形成さ
れた凹部を有し、上記凹部内に所定工具の係合部を具備
していることを特徴とする膨張弁。3. According to a displacement of a diaphragm in a temperature-sensitive chamber provided at an upper end of a valve body having a first passage through which a refrigerant flows from the receiver to the evaporator and a second passage through which the refrigerant flows from the evaporator to the compressor. A temperature expansion valve in which an adjusting screw for adjusting a pressing force of a compression spring for adjusting an opening degree of the valve body is attached to a lower end portion of the valve body so as to be able to advance and retreat. An expansion valve having a concave portion formed at an end thereof and having an engaging portion for a predetermined tool in the concave portion.
ニリンサルファイトであることを特徴とする請求項１乃
至３のいずれか１項に記載の膨張弁。4. The expansion valve according to claim 1, wherein the resin is glass fiber-containing polyphenylene sulfite.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10139344A JPH11325661A (en) | 1998-05-21 | 1998-05-21 | Expansion valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10139344A JPH11325661A (en) | 1998-05-21 | 1998-05-21 | Expansion valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH11325661A true JPH11325661A (en) | 1999-11-26 |
Family
ID=15243153
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10139344A Pending JPH11325661A (en) | 1998-05-21 | 1998-05-21 | Expansion valve |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH11325661A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1302733A1 (en) * | 2001-10-10 | 2003-04-16 | TGK CO., Ltd. | Expansion valve |
| US9145042B2 (en) | 2010-04-26 | 2015-09-29 | Toyota Jidosha Kabushiki Kaisha | Air conditioning apparatus for a vehicle |
| JP2020143855A (en) * | 2019-03-07 | 2020-09-10 | 株式会社不二工機 | Expansion valve |
| JP2020165441A (en) * | 2019-03-28 | 2020-10-08 | 株式会社鷺宮製作所 | Temperature expansion valve and refrigeration cycle system |
-
1998
- 1998-05-21 JP JP10139344A patent/JPH11325661A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1302733A1 (en) * | 2001-10-10 | 2003-04-16 | TGK CO., Ltd. | Expansion valve |
| US6612503B2 (en) | 2001-10-10 | 2003-09-02 | Tgk Co., Ltd. | Expansion valve |
| US9145042B2 (en) | 2010-04-26 | 2015-09-29 | Toyota Jidosha Kabushiki Kaisha | Air conditioning apparatus for a vehicle |
| JP2020143855A (en) * | 2019-03-07 | 2020-09-10 | 株式会社不二工機 | Expansion valve |
| JP2020165441A (en) * | 2019-03-28 | 2020-10-08 | 株式会社鷺宮製作所 | Temperature expansion valve and refrigeration cycle system |
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