JP2004101082A

JP2004101082A - Freezing device

Info

Publication number: JP2004101082A
Application number: JP2002264159A
Authority: JP
Inventors: Shigeji Oishi; 大石　繁次; Osamu Shioume; 塩梅　修
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: 2004-04-02
Anticipated expiration: 2022-09-10
Also published as: JP4014147B2

Abstract

<P>PROBLEM TO BE SOLVED: To provide a freezing device dispensing with accurate cutting work and press-fitting process, capable of being produced at low cost, easily coping with a model whereby a refrigerant passing noise countermeasure is not required, and capable of exhibiting excellent noise reduction efficiency. <P>SOLUTION: In this freezing device wherein a connecting pipe 4 equipped with a flange part 41 and a seal groove part 43 is connected to a high pressure side passage 32 of an expansion valve 1, a throttling member 6 is inserted into the connecting pipe 4 so that a throttling part 64 is formed. The throttling member 6 exhibits excellent productivity and attaching characteristics and is effective for reducing the cost when the throttling 6 is formed by a cylindrical body made of rubber or resin. <P>COPYRIGHT: (C)2004,JPO

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、鍔状部とシール溝部とを形成した接続配管を使用する冷凍装置において、前記接続配管内に、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。
【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。
この筒体は、請求項３に記載の如く、シール溝部の内側の径小部で固定すると、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。
【０００８】
請求項４に記載の発明では、接続配管に、絞り部品の外径を２カ所以上で固定させている。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。
請求項５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６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７に記載の発明では、絞り部品は、内側が金属、外側は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８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９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。
【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
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
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]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a refrigeration system used for an air conditioner of a vehicle or the like, and particularly relates to reduction of noise of a refrigerant passing through an expansion valve.
[0002]
[Prior art]
In order to reduce the refrigerant passage noise generated by the expansion valve, a proposal has been made to provide a throttle section in a high pressure path connected to the inlet of the expansion valve to reduce or miniaturize bubbles in the refrigerant (see Patent Document 1). ). The throttle portion is formed in a pipe connected to the inflow port of the expansion valve or a pipe connection connector for connecting the pipe to the inflow port.
[0003]
[Patent Document 1]
JP-A-8-159616 (FIGS. 1 to 5)
[0004]
[Problems to be solved by the invention]
The throttle portion of a conventional expansion valve is formed by press-fitting a ring of another article into a pipe connection connector or by adding a connection connector having a cut-out throttle portion. The press-fitting of the ring requires processing accuracy for press-fitting and also requires a press-fitting press step, which increases the cost. In addition, the addition of a connection connector requires a cutting part, and in the case of a model that does not require countermeasures for refrigerant passage noise, it is necessary to set two types of connectors, which leads to an increase in cost.
[0005]
An object of the present invention is to provide a refrigeration apparatus that does not require precise cutting and press-fitting steps, can easily cope with models that do not require measures against refrigerant passage noise, and has noise measures with a higher noise reduction effect. It is in.
[0006]
[Means for Solving the Problems]
The present invention provides a refrigeration apparatus using a connection pipe formed with a flange portion and a seal groove as a connection member connected to a high pressure side passage of an expansion valve interposed in a refrigerant flow path. Then, a drawn part was inserted to form a drawn part. With this configuration, the throttle portion can be formed only by installing the throttle component in the connection pipe. For this reason, precise cutting and press-fitting steps are not required, and a drawing structure with the highest noise prevention effect can be provided at low cost. Further, by not installing the throttle component, it is possible to cope with a model that does not require measures against the refrigerant passage noise.
[0007]
According to the second aspect of the present invention, the drawing component is formed of a rubber or resin cylinder whose inside diameter is a drawing portion. For this reason, it is excellent in productivity and mounting properties, and is effective for cost reduction.
When this cylindrical body is fixed by the small diameter portion inside the seal groove as described in claim 3, there is an advantage that it can be easily and surely fixed, and no separate fixing means is required.
[0008]
According to the fourth aspect of the invention, the outer diameter of the throttle component is fixed to the connection pipe at two or more locations. Thereby, the fixing of the drawing component is stabilized, and the rattling can be reliably prevented.
According to the fifth aspect of the present invention, a projection is provided on the outer periphery of the drawn part so as to catch on the small diameter portion inside the seal groove. For this reason, it is possible to reliably hold the throttle component at the small diameter portion inside the seal groove of the connection pipe at low cost.
[0009]
In the invention described in claim 6, the drawn part is formed of a metal cylinder. For this reason, the size of the narrowed portion can be precisely formed, and the durability is excellent and the maintenance becomes easy.
In the invention described in claim 7, the drawn part is formed of a metal body on the inside and a rubber or resin cylinder on the outside. With this configuration, the dimension of the throttle part can be precisely formed while maintaining the fitting property of the throttle part to the connection pipe, and the durability is excellent and the maintenance is facilitated.
[0010]
In the invention described in claim 8, the inner diameter of the high pressure side passage of the expansion valve is set smaller than the outer diameter of the throttle component. As a result, the problem that the throttle component falls into the high-pressure side passage can be realized at low cost.
According to the ninth aspect of the present invention, the length of the narrowed portion is set to 5 mm or more. Thereby, a high silencing effect can be obtained.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
The present invention will be described based on an embodiment shown in the drawings. FIG. 1 schematically shows a refrigerating apparatus used for an air conditioner for a vehicle, in which a compressor A, a condenser C, an expansion valve 1, and an evaporator E are connected by piping in a refrigerant channel to form a refrigerating cycle. I have. The expansion valve 1 includes a block-shaped main body 2 that is long in the vertical direction in the figure. At a lower portion of the main body 2, an inflow path 3 for flowing a refrigerant from the condenser C to the evaporator E is provided. In the upper part of the main body 2, there is provided an outflow channel 30 through which the refrigerant flows from the evaporator E to the compressor A.
[0012]
The inflow passage 3 includes a low-pressure side passage 31 communicating with the evaporator E, a high-pressure side passage 32 communicating 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 a 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 by a lid 23, and the entrance side of the horizontal hole 22 is a large-diameter insertion port 24. The insertion port 24 has a cylindrical shape, and the connection pipe 4 from the condenser C is connected.
[0013]
The low-pressure side passage 31 is provided higher than the high-pressure side passage 32, and has a communication hole 25 that opens to the other side surface of the main body 2 and communicates with an upper end of the orifice 33. An outer portion of the communication hole 25 is a fitting port 26 having a large diameter. A connection pipe (not shown) to the evaporator E is inserted into the fitting port 26.
[0014]
The outflow channel 30 is constituted by a channel hole 27 provided in the upper part of the main body 2 so as to penetrate in the lateral direction. The other open end of the flow passage hole 27 is a fitting port 28 into which a connection pipe (not shown) connected to the outlet of the evaporator E is inserted. One open end of the flow passage hole 27 is connected to the compressor A. The 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 penetrating the outflow channel 30 and a middle-diameter portion 12 and a small-diameter portion 13 penetrating the outflow channel 30 and the low-pressure side passage 31. The vertical hole 10 is provided with a diaphragm type valve opening adjusting means 5.
[0016]
The valve opening adjusting means 5 includes a sealed diaphragm chamber 51 and a pressure equalizing chamber 52 communicating with the outflow passage 30 in a substantially abacus ball-shaped housing 50 installed on the upper end surface 2A and the large diameter portion 11. Is provided. 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 through the outflow passage 30 and abuts the operating rod 58. The operating rod 58 penetrates the orifice 33 with a gap around the lower end thereof, and the lower end reaching the high-pressure side passage 32 has a ball shape. Abuts on the valve element 55 of the first embodiment. The valve body 55 is connected to a valve body receiver 56 housed in the vertical chamber 21, and is constantly urged in a direction to close the orifice 33 by a spring 57 interposed between the valve body receiver 56 and the lid 23. I have.
[0018]
The valve opening degree adjusting means 5 is configured to control the pressure from the diaphragm chamber 51 that changes according to the heat transmitted through the temperature sensing rod 54 in accordance with the temperature of the refrigerant in the outflow channel 30 and the refrigerant from the outflow channel 30. The valve body 55 is displaced by the balance between the pressure and the spring 57, and the opening degree of the expansion valve 1 is adjusted. Thus, the valve element 55 and the orifice 33 form an expansion section that decompresses and expands the refrigerant from the high-pressure side passage 32 to the low-pressure side passage 31 in a mist state.
[0019]
As shown in FIG. 2, the connection pipe 4 has a bulge-processed end portion 40, and is provided with a flange 41, an enlarged diameter portion 42 at the tip thereof, and a seal groove 43 provided around the enlarged diameter portion 42. Have been. A seal ring 44 is externally fitted in the seal groove 43, and the inside of the seal groove 43 is a small-diameter portion 45. In the end portion 40, the drawing component 6 according to the first embodiment of the present invention is inserted.
[0020]
As shown in FIGS. 2 and 3 in this embodiment, the throttle component 6 is a rubber or resin cylinder, and one end of the throttle component 6 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 a middle cylindrical portion 62 whose middle portion is slightly larger in diameter and tightly fitted to the small diameter portion 45, and a large-diameter flange portion 63 fitted at the other end to the tip of the enlarged diameter portion 42. The inside of the throttle component 6 has the same radius and forms a throttle portion 64 for the refrigerant. As described above, by holding the throttle part 6 at two places of the connection pipe 4, it is possible to effectively prevent the drawer part 6 from wobbling and vibrating or generating abnormal noise.
[0021]
The outer diameter of the flange portion 63 is set to be larger than the inner diameter of the lateral hole 22. This is because the thrust applied to the throttle component 6 from the urging force due to the flow of the refrigerant is larger than the holding force of the throttle component 6 by the connection pipe 4, and when the throttle component 6 moves downstream, the throttle component 6 is moved into the lateral hole 22. This is to prevent falling. The flange portion 63 is engaged with the back wall 16 of the insertion port 24 around the lateral hole 22 to prevent the drawn part 6 from entering the lateral hole 22. In this case, it is preferable that the diameter of the lateral hole 22 is set to be 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 3A are attached to the main body 2 by connecting a plate-like connector 46 having an insertion hole for the connection pipe 4 and the outflow pipe 3A to the main body 2. This is done by fastening to the side. In this embodiment, the connector 46 is screwed into a screw hole 48 of the main body 2 with a bolt 47.
[0023]
In the expansion valve 1, when the refrigerant flowing from the condenser C into the high-pressure side passage 32 passes through the throttle portion 64 of the throttle component 6, bubbles in the refrigerant are reduced or miniaturized, and are generated in the expansion valve 1. Refrigerant passing noise can be reduced. As a result of various tests, the reduction of the refrigerant passing sound is high when the inner diameter of the throttle portion 64 is set to 2.5 to 4.0 mm and the length is set to 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 squeezed portion 64 of the squeezed part 6 having an inner diameter of 3.0 mm. According to this data, when starting the refrigerating apparatus where the noise increases, the noise is remarkably reduced when the length L is 10 mm or more, and a considerable effect is obtained when the length L is 5 mm. In a steady operation, the noise prevention effect is remarkable when the length L is 1 mm or more. For this reason, it is proved that L ≧ 5.0 mm is desirable in order to obtain a reliable effect of reducing the refrigerant passing sound at the start-up when the noise is most problematic.
[0025]
FIG. 6 shows a drawing part 6 according to the second embodiment. In this embodiment, as shown in FIG. 6A, the length of the leg cylinder 61 is set to be long enough to fit deeply into the connection pipe 4 upstream of the flange 41. For this reason, as shown in FIG. 6B, even if the throttle component 6 is displaced by the urging force due to the flow of the refrigerant, and the flange portion 63 abuts against the inner wall 16 of the insertion port 24, even if the throttle component 6 Location fixation is maintained. As a result, even if the size of the gap between the flange portion 63 and the back wall 16 increases due to the variation in the product size and the wear of the drawing part 6 over time, the stable holding of the drawing part 6 is maintained.
[0026]
FIG. 7 shows a drawing part 6 according to the third embodiment, in which a protrusion 65 is provided on the outer periphery of the middle cylinder part 62 to engage with the small diameter part 45 inside the seal groove part 43. For this reason, even if the throttle component 6 is displaced in the direction in which the throttle component 6 comes off due to 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. Will be maintained. As a result, the same effect as in the second embodiment is obtained. 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 projections 65 are appropriately set in consideration of the force required for inserting the drawing part 6 and the force applied in the direction of removal.
[0027]
FIG. 8 shows a drawing part 7 according to the fourth embodiment. The drawn part 7 is formed of metal by cold forging, pressing, casting, or the like. The metal drawing part 7 has a leg cylinder part 71 whose one end side is press-fitted into the inner diameter of the connection pipe 4 upstream of the flange 41, and a middle cylinder part 72 whose middle part is press-fitted into the small diameter part 45 with a slightly larger diameter. And a large-diameter flange portion 73 whose other end is fitted into the front end of the large-diameter portion 42. The inside of the throttle component 7 has the same radius and serves as a throttle portion 74 for the refrigerant. The middle cylindrical portion 72 is press-fitted into the small-diameter portion 45 inside the seal groove 43 of the connection pipe 4 and attached. The metal throttle component 7 has the advantage of being excellent in durability, having a small change in the inner diameter at the time of press-fitting, and having the designed dimensional accuracy of the throttle portion 74 of the refrigerant.
[0028]
As shown in FIG. 9, the metal drawing part 7 is attached to the connection pipe 4 by inserting the connection pipe 4 into which the leg tube 71 and the middle tube 72 are inserted into the insertion port 24 of the main body 2, and the connector 46. With a bolt 47. Thereby, the flange part 73 of the drawing part 7 comes into contact with the inner wall 16 of the insertion port 24. When the connector 46 is further tightened with the bolt 47, the leg tube portion 71 is press-fitted into the connection pipe 4 and the middle tube portion 72 is press-fitted into the small-diameter portion 45. Therefore, it is possible to assemble the drawing part 7 without newly adding a press-fitting step.
[0029]
FIG. 10 shows a drawing part 8 according to the fifth embodiment. The drawn part 8 of this embodiment has a structure in which the outer periphery of a metal core pipe 81 is surrounded by an outer pipe 82 made of resin or rubber. In this configuration, the excellent mountability of the resin or rubber drawing part 6 of the first to third embodiments, the excellent durability of the metal drawing part 7 of the fourth embodiment, and the size of the drawing part 64 are provided. Both advantages of accuracy and precision are obtained. The core pipe 81 can be manufactured relatively inexpensively by molding the pipe material, and the fitting surface with the mantle pipe 82 is formed by insert molding when the mantle pipe 82 is made of resin and bonded by an adhesive when 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 sectional view of a connection pipe.
FIG. 3 is a front view of the drawing part of the first embodiment.
FIG. 4 is a perspective view of an expansion valve.
FIG. 5 is a graph showing a measurement result of a refrigerant passing sound.
FIG. 6 is a front view of a drawing part according to a second embodiment.
FIG. 7 is a front view of a drawing part according to a third embodiment.
FIG. 8 is a front view of a drawing part according to a fourth embodiment.
FIG. 9 is a process diagram for assembling the drawn parts according to the fourth embodiment.
FIG. 10 is a front view of a drawing part 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 pipe 41 Flange 43 Seal groove 45 Small diameter part 5 Valve opening adjusting means 6 Aperture parts 64 of the first to third embodiments 64 Aperture part 65 Projection 7 Aperture parts 8 of the fourth embodiment 8 Aperture parts of the fifth embodiment

Claims

In a refrigerating apparatus using a connection pipe formed with a flange portion and a seal groove as a connection member connected to a high pressure side passage of an expansion valve interposed in a refrigerant flow path, a throttle component is provided in the connection pipe. A refrigeration apparatus, wherein a squeezed portion is formed by insertion.

2. The refrigeration apparatus according to claim 1, wherein the throttle component is a rubber or resin cylinder whose inside diameter is the throttle section. 3.

3. The refrigeration apparatus according to claim 2, wherein an outer periphery of the throttle component is fixed at a small diameter portion inside the seal groove.

4. The refrigeration apparatus according to claim 3, wherein the connection pipe fixes the outer diameter of the throttle part at two or more locations. 5.

4. The refrigerating apparatus according to claim 3, wherein a projection is provided on an outer periphery of the throttle part so as to catch on a small diameter portion inside the seal groove.

2. The refrigeration apparatus according to claim 1, wherein the throttle component is a metal cylinder whose inside diameter is the throttle section. 3.

2. The refrigerating apparatus according to claim 1, wherein the constricted part has an inner diameter corresponding to the constricted portion, a metal part on the inside, and a rubber or resin cylinder on the outside. 3.

The refrigeration apparatus according to any one of claims 1 to 7, wherein an inner diameter of the high-pressure side passage of the expansion valve is smaller than an outer diameter of the throttle part.

The refrigeration apparatus according to any one of claims 1 to 8, wherein the length of the constricted portion is 5 mm or more.