JP4014147B2

JP4014147B2 - Refrigeration equipment

Info

Publication number: JP4014147B2
Application number: JP2002264159A
Authority: JP
Inventors: 繁次大石; 修塩梅
Original assignee: Denso Corp; Gomuno Inaki Co Ltd
Current assignee: Denso Corp; Gomuno Inaki Co Ltd
Priority date: 2002-09-10
Filing date: 2002-09-10
Publication date: 2007-11-28
Anticipated expiration: 2022-09-10
Also published as: JP2004101082A

Description

【０００１】
【発明の属する技術分野】
この発明は、車両などの空調装置に使用される冷凍装置に関し、とくに膨張弁を通過する冷媒の騒音の低減にかかわる。
【０００２】
【従来の技術】
膨張弁で発生する冷媒通過音を低減させるため、膨張弁の流入口に接続される高圧経路に絞り部を設け、冷媒中の気泡を低減または微細化する提案がなされている（特許文献１参照）。この絞り部は、膨張弁の流入口に接続される配管または配管を流入口に接続するための配管接続用コネクタに形成されている。
【０００３】
【特許文献１】
特開平８−１５９６１６号公報（図１〜図５）
【０００４】
【発明が解決しようとする課題】
従来の膨張弁の絞り部は、配管接続用コネクタに別物品のリングを圧入するか、または切削加工した絞り部を有する接続用コネクタを追加して形成されている。リングの圧入は、圧入のための加工精度が必要であるとともに、圧入プレス工程を必要とするため、コストの増大となる。また、接続用コネクタの追加は切削部品を必要とし、冷媒通過音対策の不要な機種を含む場合には、コネクタを２種類設定する必要が生じるため、コストアップにつながる。
【０００５】
この発明の目的は、精密な切削加工や圧入工程が不要であるとともに、冷媒通過音対策の不要な機種にも容易に対応でき、かつより騒音低減効果の高い騒音対策を備えた冷凍装置の提供にある。
【０００６】
【課題を解決するための手段】
この発明は、冷媒流路に介装された膨張弁の高圧側通路に接続される接続部材として、端部がバルジ加工され、鍔状部と、その先端の拡径部と、拡径部に周設されたシール溝部とを形成した接続配管を使用し、接続配管内に、絞り部品を挿入して絞り部を形成した。この構成により、絞り部品を接続配管内に設置するだけで絞り部を形成できる。このため、精密な切削加工や圧入工程が不要であり、最も騒音防止効果の高い絞り構造を低コストに提供できる。また、絞り部品の設置を行わないことで、冷媒通過音対策の不要な機種にも対応できる。
また、シール溝部の内側の径小部で絞り部品を固定することにより、容易かつ確実に固定できるとともに、別途に固定手段が不要となる利点がある。
また、この発明では、接続配管が、絞り部品の外径を２カ所以上で固定している。これにより、絞り部品の固定が安定し、がたつきが確実に防止できる。
【０００７】
請求項２に記載の発明では、絞り部品を、内径が絞り部であるゴムまたは樹脂製の筒体で形成している。このため、生産性および装着性に優れ、コストの削減に有効である。
【０００８】
請求項３に記載の発明では、絞り部品の外周にシール溝の内側の径小部に引っかかる突起を設けている。このため、低コストかつ確実に絞り部品を接続配管のシール溝部の内側の径小部に保持させることができる。
【０００９】
請求項４に記載の発明では、絞り部品を金属製筒体で形成している。このため、絞り部の寸法を精密に形成できるとともに耐久性に優れメンテナンスが容易になる。
請求項５に記載の発明では、絞り部品は、内側が金属、外側がゴムまたは樹脂の筒体で形成している。この構成では、絞り部品の接続配管への装着性を維持したまま、絞り部の寸法を精密に形成できるとともに耐久性に優れメンテナンスが容易になる。
【００１０】
請求項６に記載の発明では、膨張弁の高圧側通路の内径を絞り部品の外径より小さく設定した。これにより、絞り部品が高圧側通路内に落ち込む不具合が低コストに実現できる。
請求項７に記載の発明では、絞り部の長さを５ｍｍ以上としている。これにより、高い消音効果が得られる。
請求項８に記載の発明では、絞り部品が、鍔状部より上流側の接続配管の内径に固定される脚筒部と、やや径大で径小部に固定される中筒部と、拡径部の先端に嵌まり込む径大のフランジ部とを有する。
請求項９に記載の発明では、絞り部品は、外径を２カ所で締まり嵌めされている。
【００１１】
【発明の実施の形態】
この発明を図に示す実施例に基づき説明する。図１は、自動車用空調装置に使用される冷凍装置の概略を示し、圧縮機Ａ、凝縮器Ｃ、膨張弁１、および蒸発器Ｅを冷媒流路で配管結合して冷凍サイクルを構成している。膨張弁１は、図示上下に長いブロック状の本体２を備える。本体２の下部には、凝縮器Ｃから蒸発器Ｅへ冷媒を流通させる流入路３が設けられている。本体２の上部には、蒸発器Ｅから圧縮機Ａへ冷媒を流通させる流出流路３０が設けられている。
【００１２】
流入路３は、蒸発器Ｅと連通する低圧側通路３１と、凝縮器Ｃと連通する高圧側通路３２と、低圧側通路３１と高圧側通路３２とを縦に接続するオリフィス３３とで構成されている。高圧側通路３２は、本体２の下端面から縦に開けられた縦室２１と、本体２の一側面から開けられ縦室２１に接続した横穴２２とからなる。縦室２１の下端は蓋体２３で閉塞されており、横穴２２の入口側は径大の差込み口２４となっている。差込み口２４は円筒状を呈し、凝縮器Ｃからの接続配管４が接続される。
【００１３】
低圧側通路３１は、高圧側通路３２より上位に設けられ、本体２の他側面に開口するとともに、オリフィス３３の上端とを連通する連通孔２５からなる。連通孔２５の外側部は、径大の嵌合ポート２６となっている。嵌合ポート２６には蒸発器Ｅへの接続配管（図示せず）が差し込まれる。
【００１４】
流出流路３０は、本体２の上部に横方向に貫通して設けられた流路穴２７によって構成される。流路穴２７の他方の開口端部は蒸発器Ｅの出口に接続された接続配管（図示せず）が差し込まれる嵌合ポート２８、流路穴２７の一方の開口端部は圧縮機Ａへの流出管３Ａ（図４参照）が差し込まれる嵌合ポート２９となっている。
【００１５】
本体２には、上端面２Ａからオリフィス３３と同軸心を有する縦穴１０が設けられている。縦穴１０は、流出流路３０に貫通する径大部１１、および流出流路３０と低圧側通路３１とを貫通する径中部１２および径小部１３からなる。縦孔１０にはダイヤフラム式の弁開度調節手段５が設置されている。
【００１６】
弁開度調節手段５は、上端面２Ａおよび径大部１１に設置された略そろばん玉型のハウジング５０内に、密閉されたダイヤフラム室５１と、流出流路３０に連通する均圧室５２とに区画するダイヤフラム５３を設置している。ダイヤフラム５３の下面の中心には、感温棒５４の上端が連結されている。
【００１７】
感温棒５４は、流出流路３０内を挿通し、作動棒５８と当接し、作動棒５８はオリフィス３３を周囲に隙間を残して貫通し、高圧側通路３２に達した下端部がボール状の弁体５５と当接している。弁体５５は縦室２１に収納された弁体受け５６と結合し、弁体受け５６と蓋体２３との間に介装されたスプリング５７によりオリフィス３３を閉鎖する方向に常時付勢されている。
【００１８】
弁開度調節手段５は、流出流路３０内の冷媒温度に応じて感温棒５４を介して伝達された熱により変化するダイヤフラム室５１側からの圧力と、流出流路３０側からの冷媒圧力と、スプリング５７との釣り合により弁体５５を変位させ、膨張弁１の開度を調節する。これにより、弁体５５とオリフィス３３とによって高圧側通路３２から低圧側通路３１に冷媒を霧状に減圧膨張させる膨張部が構成されている。
【００１９】
接続配管４は、図２に示す如く、端部４０がバルジ加工され、鍔状部４１と、その先端の拡径部４２と、該拡径部４２に周設されたシール溝部４３とが設けられている。シール溝部４３にはシールリング４４が外嵌めされ、シール溝部４３の内側は径小部４５となっている。端部４０内には、この発明の第１実施例にかかる絞り部品６が差し込まれている。
【００２０】
絞り部品６は、この実施例では図２、図３に示す如く、ゴム製または樹脂製の筒体であり、一端側が鍔状部４１より上流側の接続配管４の内径に締まり嵌めされる脚筒部６１、中間がやや径大で径小部４５に締まり嵌めされる中筒部６２、他端に拡径部４２の先端に嵌まり込む径大のフランジ部６３からなる。絞り部品６の内部は同一半径で、冷媒の絞り部６４となっている。このように、接続配管４の２カ所で絞り部品６を保持させることにより、絞り部品６がふらついて振動したり、異音を発生したりする不具合を有効に防止できる。
【００２１】
フランジ部６３の外径は、横穴２２の内径より大きく設定してある。これは、接続配管４による絞り部品６の保持力より、冷媒の流動による付勢力から絞り部品６に加わるスラストが大きく、絞り部品６が下流に移動した場合に、絞り部品６が横穴２２内に落ち込むことを防止するためである。フランジ部６３は、横穴２２の周囲の差込み口２４の奥壁１６に係合して、絞り部品６が横穴２２に進入することを阻止している。また、この場合に、絞り部６４の内径より横穴２２の直径を大きく設定しておき、圧力損失が大きくならないようにすることが望ましい。
【００２２】
絞り部品６が挿入された接続配管４、および流出管３Ａの本体２への取付は、図４に示す如く、接続配管４および流出管３Ａの挿通穴を有す板状コネクタ４６を、本体２の側面に締結して行われる。この実施例では、コネクタ４６を、ボルト４７で、本体２のネジ穴４８へ螺合させて行う。
【００２３】
この膨張弁１では、凝縮器Ｃから高圧側通路３２に流入する冷媒は、絞り部品６の絞り部６４を通過する際に、冷媒中の気泡が低減または微細化され、膨張弁１で発生する冷媒通過音が低減できる。この冷媒通過音の低減は、各種のテストの結果、絞り部６４は、内径を２．５〜４．０ｍｍ、長さを５．０ｍｍ以上に設定すると、冷媒通過音の低減効果が高いことが判明した。
【００２４】
図５は、内径が３．０ｍｍの絞り部品６の絞り部６４の長さＬを変えてテストした騒音レベルの聴感評価データを示す。このデータによれば、騒音が大きくなる冷凍装置の起動時においては、長さＬが１０ｍｍ以上で騒音の低下が顕著であり、５ｍｍで相当の効果がある。また、定常運転時には、長さＬが１ｍｍ以上で騒音防止効果が顕著である。このため、最も騒音が問題となる起動時において確実な冷媒通過音の低減効果を得るために、Ｌ≧５．０ｍｍであることが望ましいことが証明される。
【００２５】
図６は、第２実施例にかかる絞り部品６を示す。この実施例では、図６の（イ）に示す如く、脚筒部６１を長くして、鍔状部４１より上流側の接続配管４内に深く嵌まり込む寸法に設定している。このため、図６の（ロ）に示す如く、冷媒の流動による付勢力で、絞り部品６が変位し、フランジ部６３が差込み口２４の奥壁１６に当接しても、絞り部品６の２カ所固定が維持される。この結果、製品寸法のバラツキや、絞り部品６の経時磨耗で、フランジ部６３と奥壁１６との隙間の寸法が大きくなっても、絞り部品６の安定保持が維持される。
【００２６】
図７は、第３実施例にかかる絞り部品６を示し、中筒部６２の外周に、シール溝部４３の内側の径小部４５に係合する突起６５を設けている。このため、冷媒の流動による付勢力で、絞り部品６が抜ける方向に変位しても、突起６５が径小部４５に係合して移動が阻止されるため、絞り部品６の２カ所固定が維持される。この結果、第２実施例と同様な効果がある。この実施例では、高さ０．１〜０．５ｍｍの半球状突起６５を４個、等間隔に形成している。突起６５の形状、高さ、個数などは、絞り部品６の挿入に要する力、抜ける方向に加わる力との兼ね合いで適宜に設定する。
【００２７】
図８は、第４実施例にかかる絞り部品７を示す。絞り部品７は、冷間鍛造、プレス、鋳造などにより金属で形成されている。金属製の絞り部品７は、一端側が鍔状部４１より上流側の接続配管４の内径に圧入される脚筒部７１、中間がやや径大で径小部４５に圧入される中筒部７２、他端側が拡径部４２の先端に嵌まり込む径大のフランジ部７３からなる。絞り部品７の内部は同一半径で、冷媒の絞り部７４となっている。接続配管４のシール溝４３の内側の径小部４５に中筒部７２を圧入して装着される。この金属製の絞り部品７は、耐久性に優れるとともに、圧入時に内径の変化が少なく、冷媒の絞り部７４が設計した寸法精度となる利点がある。
【００２８】
金属製の絞り部品７の接続配管４への装着は、図９に示す如く、本体２の差込み口２４に、脚筒部７１および中筒部７２を差し込んだ接続配管４を挿入し、コネクタ４６をボルト４７で締め付ける。これにより、絞り部品７は、フランジ部７３が差込み口２４の奥壁１６に当接する。さらにコネクタ４６をボルト４７で締め付けると、脚筒部７１が接続配管４内に圧入されると同時に中筒部７２が径小部４５に圧入されて行く。このため、新たに圧入工程を追加することなく絞り部品７の組付けが可能である。
【００２９】
図１０は、第５実施例にかかる絞り部品８を示す。この実施例の絞り部品８は、金属製の芯パイプ８１の外周を樹脂製またはゴム製の外套パイプ８２で包囲した構造を有している。この構成では、第１〜第３実施例の樹脂製またはゴム製絞り部品６が備える優れた装着性と、第４実施例の金属製絞り部品７が有する優れた耐久性および絞り部６４の寸法精度との、双方の利点が得られる。なお、芯パイプ８１は、パイプ材の成形で比較的安価に製造でき、外套パイプ８２との嵌合面は、外套パイプ８２が樹脂製の場合はインサート成形、ゴム製の場合で接着剤による接着が実用的である。
【図面の簡単な説明】
【図１】冷凍装置の概略構成図である。
【図２】接続配管の断面図である。
【図３】第１実施例の絞り部品の正面図である。
【図４】膨張弁の斜視図である。
【図５】冷媒通過音の測定結果を示すグラフである。
【図６】第２実施例の絞り部品の正面図である。
【図７】第３実施例の絞り部品の正面図である。
【図８】第４実施例の絞り部品の正面図である。
【図９】第４実施例の絞り部品の組付工程図である。
【図１０】第５実施例の絞り部品の正面図である。
【符号の説明】
１膨張弁
２膨張弁の本体
３冷媒の流入路
３０冷媒の流出流路
３１低圧側通路
３２高圧側通路
３３オリフィス
４接続配管
４１鍔状部
４２拡径部
４３シール溝部
４５径小部
５弁開度調節手段
６第１〜第３実施例の絞り部品
６１脚筒部
６２中筒部
６３フランジ部
６４絞り部
６５突起
７第４実施例の絞り部品
８第５実施例の絞り部品[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a refrigeration apparatus used for an air conditioner such as a vehicle, and particularly relates to a reduction in noise of a refrigerant passing through an expansion valve.
[0002]
[Prior art]
In order to reduce the refrigerant passing sound generated in the expansion valve, a proposal has been made to reduce or refine the bubbles in the refrigerant by providing a throttling portion in the high-pressure path connected to the inlet of the expansion valve (see Patent Document 1). ). The throttle portion is formed on a pipe connected to the inlet of the expansion valve or a pipe connecting connector for connecting the pipe to the inlet.
[0003]
[Patent Document 1]
JP-A-8-159616 (FIGS. 1 to 5)
[0004]
[Problems to be solved by the invention]
The throttle part of the conventional expansion valve is formed by press-fitting a ring of another article into the pipe connection connector or by adding a connector for connection having a cut throttle part. The press-fitting of the ring requires processing accuracy for press-fitting and requires a press-fitting press process, which increases costs. Further, the addition of the connector for connection requires a cutting part. When a model that does not require countermeasures against refrigerant passing sound is included, it is necessary to set two types of connectors, leading to an increase in cost.
[0005]
An object of the present invention is to provide a refrigeration apparatus that does not require a precise cutting process or press-fitting process, can easily cope with a model that does not require countermeasures against refrigerant passing sound, and has noise countermeasures that have a higher noise reduction effect. It is in.
[0006]
[Means for Solving the Problems]
In the present invention, as a connecting member connected to the high pressure side passage of the expansion valve interposed in the refrigerant flow path, the end portion is bulged, and the flange portion , the enlarged diameter portion at the tip thereof, and the enlarged diameter portion using the connection pipe forming a circumferentially provided by seal groove, in connection pipe, to form a throttle portion by inserting the aperture component. With this configuration, the throttle portion can be formed simply by installing the throttle component in the connection pipe. For this reason, precise cutting and press-fitting processes are unnecessary, and a drawing structure having the highest noise prevention effect can be provided at low cost. Also, by not installing the throttle parts, it is possible to deal with models that do not require countermeasures against refrigerant passing sound.
Further, by fixing the throttle part with the small diameter portion inside the seal groove portion, there is an advantage that it can be fixed easily and surely, and a separate fixing means is unnecessary.
Further, in the present invention, the connecting pipe fixes the outer diameter of the throttle part at two or more locations. As a result, the aperture parts can be fixed stably and rattling can be reliably prevented.
[0007]
In the second aspect of the present invention, the drawn part is formed of a rubber or resin cylinder having an inner diameter that is the drawn part. For this reason, it is excellent in productivity and mountability, and is effective for cost reduction .
[0008]
In the invention described in 請 Motomeko 3 it is provided with a protrusion caught by the small-diameter portion of the inner aperture periphery into the sealing groove of the part. For this reason, it is possible to reliably hold the throttle part in the small diameter portion inside the seal groove portion of the connection pipe at a low cost.
[0009]
In the invention described in claim 4 , the drawn part is formed of a metal cylinder. For this reason, the size of the throttle portion can be precisely formed, and it is excellent in durability and easy to maintain.
In the invention described in claim 5, the diaphragm parts, the inner metal, the outer is formed with the tubular body of rubber or resin. With this configuration, the size of the throttle portion can be precisely formed while maintaining the ability to attach the throttle component to the connection pipe, and the durability is excellent and maintenance is easy.
[0010]
In the invention described in claim 6 , the inner diameter of the high-pressure side passage of the expansion valve is set smaller than the outer diameter of the throttle part. Thereby, the malfunction that a throttle part falls in the high voltage | pressure side channel | path is realizable at low cost.
In the invention according to claim 7 , the length of the throttle portion is 5 mm or more. Thereby, a high silencing effect is obtained.
In the invention according to claim 8, the throttle component includes a leg cylinder part fixed to the inner diameter of the connection pipe upstream of the bowl-shaped part, a middle cylinder part slightly larger in diameter and fixed to a smaller diameter part, and an expansion part. And a large-diameter flange portion fitted into the tip of the diameter portion.
In the invention according to claim 9, the throttle component is tightly fitted at two outer diameters.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
The present invention will be described based on the embodiments shown in the drawings. FIG. 1 shows an outline of a refrigeration apparatus used in an automobile air conditioner. A refrigeration cycle is configured by connecting a compressor A, a condenser C, an expansion valve 1 and an evaporator E by a refrigerant flow path. Yes. The expansion valve 1 includes a block-like main body 2 that is long in the vertical direction in the figure. An inflow path 3 through which the refrigerant flows from the condenser C to the evaporator E is provided at the lower part of the main body 2. In the upper part of the main body 2, an outflow passage 30 through which the refrigerant flows from the evaporator E to the compressor A is provided.
[0012]
The inflow passage 3 includes a low-pressure side passage 31 that communicates with the evaporator E, a high-pressure side passage 32 that communicates with the condenser C, and an orifice 33 that vertically connects the low-pressure side passage 31 and the high-pressure side passage 32. ing. The high-pressure side passage 32 includes a vertical chamber 21 opened vertically from the lower end surface of the main body 2 and a horizontal hole 22 opened from one side surface of the main body 2 and connected to the vertical chamber 21. The lower end of the vertical chamber 21 is closed with a lid 23, and the inlet side of the horizontal hole 22 is a large diameter insertion port 24. The insertion port 24 has a cylindrical shape and is connected to the connection pipe 4 from the condenser C.
[0013]
The low-pressure side passage 31 is provided at a higher position than the high-pressure side passage 32 and includes a communication hole 25 that opens to the other side surface of the main body 2 and communicates with the upper end of the orifice 33. The outer portion of the communication hole 25 is a large-diameter fitting port 26. A connection pipe (not shown) to the evaporator E is inserted into the fitting port 26.
[0014]
The outflow channel 30 is configured by a channel hole 27 provided penetrating in the lateral direction in the upper portion of the main body 2. The other open end of the flow path hole 27 is a fitting port 28 into which a connection pipe (not shown) connected to the outlet of the evaporator E is inserted, and one open end of the flow path hole 27 is to the compressor A. This is a fitting port 29 into which the outflow pipe 3A (see FIG. 4) is inserted.
[0015]
The main body 2 is provided with a vertical hole 10 having a coaxial center with the orifice 33 from the upper end surface 2A. The vertical hole 10 includes a large-diameter portion 11 that penetrates the outflow passage 30, and a middle-diameter portion 12 and a small-diameter portion 13 that penetrate the outflow passage 30 and the low-pressure side passage 31. A diaphragm-type valve opening degree adjusting means 5 is installed in the vertical hole 10.
[0016]
The valve opening adjusting means 5 includes a substantially abacus ball-shaped housing 50 installed on the upper end surface 2 A and the large diameter portion 11, a sealed diaphragm chamber 51, and a pressure equalizing chamber 52 communicating with the outflow passage 30. A diaphragm 53 is installed. The upper end of the temperature sensing rod 54 is connected to the center of the lower surface of the diaphragm 53.
[0017]
The temperature sensing rod 54 is inserted into the outflow passage 30 and abuts against the operation rod 58. The operation rod 58 passes through the orifice 33 leaving a gap around the periphery, and the lower end reaching the high-pressure side passage 32 has a ball shape. Is in contact with the valve body 55. The valve body 55 is coupled to a valve body receiver 56 accommodated in the vertical chamber 21, and is always urged in a direction to close the orifice 33 by a spring 57 interposed between the valve body receiver 56 and the lid body 23. Yes.
[0018]
The valve opening degree adjusting means 5 includes a pressure from the diaphragm chamber 51 side that is changed by heat transmitted through the temperature sensing rod 54 in accordance with a refrigerant temperature in the outflow passage 30 and a refrigerant from the outflow passage 30 side. The valve body 55 is displaced by the balance between the pressure and the spring 57 to adjust the opening degree of the expansion valve 1. Thus, the valve body 55 and the orifice 33 constitute an expansion portion that decompresses and expands the refrigerant from the high pressure side passage 32 to the low pressure side passage 31 in a mist form.
[0019]
As shown in FIG. 2, the connecting pipe 4 is bulged at the end 40, and is provided with a flange-shaped portion 41, a diameter-expanded portion 42 at the tip thereof, and a seal groove portion 43 provided around the diameter-expanded portion 42. It has been. A seal ring 44 is fitted on the seal groove 43, and the inside of the seal groove 43 is a small diameter portion 45. In the end portion 40, the throttle component 6 according to the first embodiment of the present invention is inserted.
[0020]
In this embodiment, as shown in FIGS. 2 and 3, the throttle component 6 is a rubber or resin cylinder, and one end of the throttle component 6 is a leg that is tightly fitted to the inner diameter of the connection pipe 4 on the upstream side of the flange 41. The cylindrical portion 61 includes an intermediate cylindrical portion 62 that is slightly larger in diameter and is tightly fitted to the small diameter portion 45, and a large flange portion 63 that is fitted to the tip of the enlarged diameter portion 42 at the other end. The inside of the throttle component 6 has the same radius and serves as a refrigerant throttle portion 64. In this way, by holding the throttle component 6 at two locations of the connection pipe 4, it is possible to effectively prevent problems such as the throttle component 6 swaying and vibrating or generating abnormal noise.
[0021]
The outer diameter of the flange portion 63 is set larger than the inner diameter of the lateral hole 22. This is because when the thrust applied to the throttle component 6 is larger than the holding force of the throttle component 6 by the connecting pipe 4 and the urging force due to the flow of the refrigerant, the throttle component 6 moves into the horizontal hole 22 when the throttle component 6 moves downstream. This is to prevent depression. The flange portion 63 engages with the inner wall 16 of the insertion port 24 around the horizontal hole 22 to prevent the throttle component 6 from entering the horizontal hole 22. In this case, it is desirable to set the diameter of the lateral hole 22 larger than the inner diameter of the throttle portion 64 so that the pressure loss does not increase.
[0022]
As shown in FIG. 4, the connection pipe 4 into which the throttle part 6 is inserted and the outflow pipe 3 </ b> A are attached to the main body 2 by connecting a plate-like connector 46 having insertion holes for the connection pipe 4 and the outflow pipe 3 </ b> A. It is done by fastening to the side. In this embodiment, the connector 46 is screwed into the screw hole 48 of the main body 2 with a bolt 47.
[0023]
In the expansion valve 1, the refrigerant flowing into the high-pressure side passage 32 from the condenser C is generated in the expansion valve 1 because bubbles in the refrigerant are reduced or miniaturized when passing through the throttle portion 64 of the throttle component 6. Refrigerant passage noise can be reduced. As a result of various tests, the reduction of the refrigerant passing sound may be highly effective in reducing the refrigerant passing sound if the throttle portion 64 is set to have an inner diameter of 2.5 to 4.0 mm and a length of 5.0 mm or more. found.
[0024]
FIG. 5 shows the audibility evaluation data of the noise level tested by changing the length L of the diaphragm 64 of the diaphragm component 6 having an inner diameter of 3.0 mm. According to this data, at the start of the refrigeration apparatus where the noise increases, the length L is 10 mm or more, and the noise is remarkably reduced, and 5 mm has a considerable effect. In steady operation, the length L is 1 mm or more, and the noise prevention effect is remarkable. For this reason, it is proved that it is desirable that L ≧ 5.0 mm in order to obtain a reliable effect of reducing the refrigerant passing sound at the start-up when noise is the most problematic.
[0025]
FIG. 6 shows a diaphragm component 6 according to the second embodiment. In this embodiment, as shown in FIG. 6 (a), the leg tube part 61 is lengthened and set to a size that fits deeply into the connection pipe 4 on the upstream side from the flange-like part 41. For this reason, as shown in FIG. 6B, even if the throttle part 6 is displaced by the urging force due to the flow of the refrigerant and the flange portion 63 abuts the back wall 16 of the insertion port 24, 2 of the throttle part 6 is obtained. The fixed position is maintained. As a result, even if the dimension of the gap between the flange portion 63 and the back wall 16 increases due to variations in product dimensions or wear of the drawn part 6 over time, stable holding of the drawn part 6 is maintained.
[0026]
FIG. 7 shows the diaphragm component 6 according to the third embodiment, and a protrusion 65 that engages with the small diameter portion 45 inside the seal groove portion 43 is provided on the outer periphery of the middle cylinder portion 62. For this reason, even if the squeezing component 6 is displaced in the direction in which the squeezing component 6 comes out by the urging force due to the flow of the refrigerant, the projection 65 engages with the small diameter portion 45 and is prevented from moving. Maintained. As a result, there are the same effects as in the second embodiment. In this embodiment, four hemispherical projections 65 having a height of 0.1 to 0.5 mm are formed at equal intervals. The shape, height, number, and the like of the protrusions 65 are set as appropriate in consideration of the force required to insert the diaphragm component 6 and the force applied in the direction of removal.
[0027]
FIG. 8 shows a diaphragm component 7 according to the fourth embodiment. The drawn part 7 is made of metal by cold forging, pressing, casting or the like. The metal throttle part 7 has a leg cylinder part 71 that is press-fitted into the inner diameter of the connecting pipe 4 on the upstream side of the flange-like part 41 and a middle cylinder part 72 that is slightly larger in diameter and press-fitted into the small diameter part 45. The other end side is composed of a large-diameter flange portion 73 fitted into the tip of the enlarged diameter portion 42. The inside of the throttle part 7 has the same radius and is a refrigerant throttle part 74. The middle cylinder portion 72 is press fitted into the small diameter portion 45 inside the seal groove 43 of the connection pipe 4 and attached. This metal throttle part 7 is excellent in durability and has the advantage that the change in the inner diameter is small during press-fitting and the dimensional accuracy designed by the refrigerant throttle part 74 is achieved.
[0028]
As shown in FIG. 9, the metal throttle part 7 is attached to the connection pipe 4 by inserting the connection pipe 4 into which the leg cylinder part 71 and the middle cylinder part 72 are inserted into the insertion port 24 of the main body 2, and the connector 46. Are tightened with bolts 47. As a result, in the diaphragm component 7, the flange portion 73 comes into contact with the back wall 16 of the insertion port 24. When the connector 46 is further tightened with the bolts 47, the leg tube part 71 is press-fitted into the connection pipe 4, and at the same time, the middle cylinder part 72 is press-fitted into the small diameter part 45. For this reason, the drawing part 7 can be assembled without newly adding a press-fitting process.
[0029]
FIG. 10 shows a diaphragm component 8 according to the fifth embodiment. The drawing component 8 of this embodiment has a structure in which the outer periphery of a metal core pipe 81 is surrounded by a resin or rubber outer pipe 82. In this configuration, the excellent wearability of the resin or rubber diaphragm part 6 of the first to third examples, the excellent durability of the metal diaphragm part 7 of the fourth example, and the size of the diaphragm part 64 are provided. Both advantages of accuracy are obtained. The core pipe 81 can be manufactured at a relatively low cost by molding a pipe material, and the fitting surface with the outer pipe 82 is formed by insert molding when the outer pipe 82 is made of resin, and bonded by an adhesive when the outer pipe 82 is made of rubber. Is practical.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram of a refrigeration apparatus.
FIG. 2 is a cross-sectional view of connection piping.
FIG. 3 is a front view of a diaphragm component according to the first embodiment.
FIG. 4 is a perspective view of an expansion valve.
FIG. 5 is a graph showing a measurement result of refrigerant passing sound.
FIG. 6 is a front view of a diaphragm component according to a second embodiment.
FIG. 7 is a front view of a diaphragm component according to a third embodiment.
FIG. 8 is a front view of a diaphragm component according to a fourth embodiment.
FIG. 9 is an assembly process diagram of a drawing part according to a fourth embodiment.
FIG. 10 is a front view of a diaphragm component according to a fifth embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Expansion valve 2 Expansion valve main body 3 Refrigerant inflow path 30 Refrigerant outflow path 31 Low pressure side passage 32 High pressure side passage 33 Orifice 4 Connection piping 41 Hook
42 Enlarged portion 43 Seal groove portion 45 Small diameter portion 5 Valve opening adjusting means 6 Throttling component of first to third embodiments
61 Leg tube
62 Middle cylinder
63 Flange part 64 Restriction part 65 Protrusion 7 Diaphragm part of 4th Example 8 Diaphragm part of 5th Example

Claims

As a connection member connected to the high-pressure side passage of the expansion valve interposed in the refrigerant flow path,
End is bulging, use a flange portion, and the enlarged diameter portion of the tip, the connection pipe formed with a seal groove provided around the the enlarged diameter portion,
In the connecting pipe, a throttle part is inserted to form a throttle part ,
The throttle component has a portion where one end is fixed to the inner diameter of the connection pipe upstream from the flange-shaped portion, and a portion fixed by a small diameter portion inside the seal groove portion, and has an outer diameter of 2 A refrigeration apparatus fixed at a place .

2. The refrigeration apparatus according to claim 1, wherein the throttle component is a rubber or resin cylinder having an inner diameter serving as the throttle portion.

2. The refrigeration apparatus according to claim 1 , wherein a protrusion that hooks the small diameter portion is provided on an outer periphery of the throttle part.

The refrigeration apparatus according to claim 1 , wherein the throttle component is a metal cylinder having an inner diameter serving as the throttle portion .

2. The refrigeration apparatus according to claim 1 , wherein the throttle component has a throttle portion having an inner diameter, and is a cylindrical body made of metal on the inner side and rubber or resin on the outer side .

The refrigeration apparatus according to any one of claims 1 to 5 , wherein an inner diameter of the high-pressure side passage of the expansion valve is smaller than an outer diameter of the throttle component .

The refrigeration apparatus according to any one of claims 1 to 6 , wherein the throttle portion has a length of 5 mm or more .

The refrigeration apparatus according to any one of claims 1 to 7, wherein the throttle component includes a leg cylinder portion fixed to an inner diameter of the connection pipe upstream of the bowl-shaped portion, and a slightly larger diameter and a smaller diameter. A refrigerating apparatus comprising: a middle cylinder portion fixed to the portion; and a large-diameter flange portion that fits into a distal end of the enlarged-diameter portion .

9. The refrigeration apparatus according to claim 1, wherein an outer diameter of the squeezing component is tightly fitted at the two locations .