JP2011220549A - Structure for mounting of temperature sensor - Google Patents

Structure for mounting of temperature sensor Download PDF

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JP2011220549A
JP2011220549A JP2010087089A JP2010087089A JP2011220549A JP 2011220549 A JP2011220549 A JP 2011220549A JP 2010087089 A JP2010087089 A JP 2010087089A JP 2010087089 A JP2010087089 A JP 2010087089A JP 2011220549 A JP2011220549 A JP 2011220549A
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temperature
temperature sensor
heat insulating
sensor mounting
mounting structure
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JP5240226B2 (en
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Shinichi Noguchi
慎一 野口
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Daikin Industries Ltd
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Daikin Industries Ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
    • G01K1/14—Supports; Fastening devices; Arrangements for mounting thermometers in particular locations
    • 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
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/21—Temperatures
    • F25B2700/2117—Temperatures of an 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
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/40—Fluid line arrangements
    • 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
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems

Abstract

PROBLEM TO BE SOLVED: To provide a structure for mounting of a temperature sensor, capable of improving workability, as well as widely applicable.SOLUTION: The temperature sensor mounting structure T includes: a temperature sensitive tube 1 arranged and fixed on the outer surface of a coolant pipe P at an angle of 70°-110° with respect to the tube axis direction, the coolant pipe being composed of a bent pipe; a temperature sensor 2 provided close to the inner periphery of the temperature sensitive tube 1; and a replaceable heat-insulating cover 3 for covering the temperature sensitive tube 1.

Description

本発明は温度センサ取付構造に関する。さらに詳しくは、例えば空気調和装置の熱交換器内を流れる冷媒の温度を間接的に検出する温度センサの取付構造に関する。   The present invention relates to a temperature sensor mounting structure. More specifically, for example, the present invention relates to a temperature sensor mounting structure for indirectly detecting the temperature of a refrigerant flowing in a heat exchanger of an air conditioner.

空気調和装置の圧縮機の運転を制御する際の重要な判断パラメータとして、当該圧縮機の吸入側圧力がある。この吸入側圧力は、圧縮機の吸入側配管に圧力センサを取り付けることで検出することができるが、圧力センサは高価であるので、コストを削減するために他の方法で吸入側圧力を求めることが考えられる。   An important judgment parameter for controlling the operation of the compressor of the air conditioner is the suction side pressure of the compressor. This suction side pressure can be detected by attaching a pressure sensor to the suction side piping of the compressor. However, since the pressure sensor is expensive, another method is used to obtain the suction side pressure in order to reduce the cost. Can be considered.

例えば、冷房運転時には、室内側熱交換器において液状の冷媒が室内空気との熱交換により気化されてガス状の冷媒になり、このガス状の冷媒が圧縮機に送り込まれる。冷媒は、室内側熱交換器を構成する細いチューブ内を複数回折り返しながら入口から出口へ移動し、その間に液相から気相への相変化が行われるが、その経路の大部分において、液状の冷媒とガス状の冷媒とが混在する湿り状態である。そして、湿り状態の冷媒の温度（飽和温度）は一定である。この飽和温度が分かれば、冷媒の物性値として飽和圧力を求めることができ、また、室内側熱交換器の出口から圧縮機の吸入口までの配管の圧力損失は所定の誤差内で想定可能であるので、熱交換器内の湿り状態の冷媒の温度が分かれば、飽和圧力が分かり、さらには圧縮機の吸入側圧力を推定することができる。   For example, during the cooling operation, in the indoor heat exchanger, the liquid refrigerant is vaporized by heat exchange with room air to become a gaseous refrigerant, and this gaseous refrigerant is sent to the compressor. The refrigerant moves from the inlet to the outlet while turning back and forth inside the narrow tube constituting the indoor heat exchanger, and during that time, the phase change from the liquid phase to the gas phase takes place. This is a wet state in which both the refrigerant and the gaseous refrigerant are mixed. The temperature (saturation temperature) of the wet refrigerant is constant. If this saturation temperature is known, the saturation pressure can be obtained as the physical property value of the refrigerant, and the pressure loss of the piping from the outlet of the indoor heat exchanger to the inlet of the compressor can be assumed within a predetermined error. Therefore, if the temperature of the wet refrigerant in the heat exchanger is known, the saturation pressure can be known, and further, the suction side pressure of the compressor can be estimated.

熱交換器を構成するチューブは銅などの熱伝導率の大きい金属で作製されているので、かかるチューブの入口と出口の間の部分（中間部分）の表面温度を検出することで間接的にチューブ内を流れる湿り状態の冷媒の温度である飽和温度を検出することができ、この飽和温度を求めることで、前述したように、圧縮機の吸入側圧力を推定することができる。   Since the tubes constituting the heat exchanger are made of a metal having a high thermal conductivity such as copper, the tube is indirectly detected by detecting the surface temperature of the portion (intermediate portion) between the inlet and the outlet of the tube. The saturation temperature that is the temperature of the wet refrigerant flowing in the interior can be detected, and by obtaining the saturation temperature, the suction side pressure of the compressor can be estimated as described above.

冷媒配管の温度を検出するために当該冷媒配管にろう付けされた感温筒内にサーミスタを配設し、感温筒を介して冷媒配管の温度を検出する技術が種々提案されている。また、周囲の空気温度の影響を受けることなく冷媒配管の温度を正確に検出するために、温度センサの外側に断熱材を配設することも知られている（例えば、特許文献１参照）。   In order to detect the temperature of the refrigerant pipe, various techniques have been proposed in which a thermistor is disposed in a temperature-sensitive cylinder brazed to the refrigerant pipe and the temperature of the refrigerant pipe is detected via the temperature-sensitive cylinder. In addition, in order to accurately detect the temperature of the refrigerant pipe without being affected by the ambient air temperature, it is also known to provide a heat insulating material outside the temperature sensor (see, for example, Patent Document 1).

特許文献１には、亜鉛鋼板などの弾性を有する薄い金属板８とポリエチレンフォームなどの断熱材９とを貼り合わせた、断面略Ｕ字型の断熱鋼板１０が開示されている。配管の温度を検出する円筒形の配管温度センサ１１は、断熱鋼板１０の内周面と空気調和機の冷媒配管１５の側面との間に挟み込まれるようにして、当該冷媒配管１５に固定される。   Patent Document 1 discloses a heat insulating steel plate 10 having a substantially U-shaped cross section in which a thin metal plate 8 having elasticity such as a zinc steel plate and a heat insulating material 9 such as polyethylene foam are bonded together. The cylindrical pipe temperature sensor 11 that detects the temperature of the pipe is fixed to the refrigerant pipe 15 so as to be sandwiched between the inner peripheral surface of the heat insulating steel plate 10 and the side face of the refrigerant pipe 15 of the air conditioner. .

特開２００７−７８２０３号公報JP 2007-78203 A

しかしながら、特許文献１記載の断熱鋼板１０は冷媒配管の管軸方向に沿って配設される構成であるため、その適用箇所が制限されている。例えば、熱交換器の場合、直管部分の外周には熱交換効率を向上させるために複数のフィンが密に配設されているので、特許文献１記載の断熱鋼板１０を適用することは困難である。これに対しフィンを配設しない直管部分を設けることも考えられるが、熱交換効率の低下や、熱交換器の大型化を伴うため、現実的ではない。   However, the heat-insulated steel sheet 10 described in Patent Document 1 is configured to be disposed along the pipe axis direction of the refrigerant pipe, and therefore, its application location is limited. For example, in the case of a heat exchanger, a plurality of fins are densely arranged on the outer periphery of the straight pipe portion in order to improve heat exchange efficiency, so it is difficult to apply the heat insulating steel sheet 10 described in Patent Document 1. It is. On the other hand, it is conceivable to provide a straight pipe portion where no fins are provided, but this is not practical because it involves a decrease in heat exchange efficiency and an increase in the size of the heat exchanger.

また、断熱鋼板１０は冷媒配管と平行に取り付けられるものであり、両者の位置関係が固定されているので、取り付け作業の自由度が低く、場所によっては作業性が悪いことがある。   Moreover, since the heat insulating steel plate 10 is attached in parallel with the refrigerant pipe and the positional relationship between the two is fixed, the degree of freedom of attachment work is low, and workability may be poor depending on the location.

本発明は、このような事情に鑑みてなされたものであり、適用範囲が広く、且つ作業性を向上させることができる温度センサ取付構造を提供することを目的としている。   The present invention has been made in view of such circumstances, and an object of the present invention is to provide a temperature sensor mounting structure that has a wide range of application and can improve workability.

（１）本発明の温度センサ取付構造は、曲管からなる冷媒配管の外表面に管軸方向に対して７０°〜１１０°の角度をなして固設される感温筒と、
この感温筒の内周面に密接して設けられる温度センサと、
前記感温筒を覆う着脱自在の断熱カバーと
を備えたことを特徴としている。 (1) A temperature sensor mounting structure according to the present invention includes a temperature sensing cylinder fixed to an outer surface of a refrigerant pipe made of a curved pipe at an angle of 70 ° to 110 ° with respect to the pipe axis direction;
A temperature sensor provided in close contact with the inner peripheral surface of the temperature sensing cylinder;
And a detachable heat insulating cover for covering the temperature sensing cylinder.

本発明の温度センサ取付構造では、温度センサを収容する感温筒が冷媒配管の外表面に管軸方向に対して７０°〜１１０°の角度をなして固設されるものであるので、冷媒配管の曲管部分にも取り付けることができる。曲管の温度検出が可能になることで、温度センサを収容した感温筒の設置可能箇所を拡大することができる。設置箇所周囲の作業スペースなどを考慮して、前記７０°〜１１０°の範囲内で、すなわち９０°±２０°の範囲内で取付角度を決めることができるので、作業性を向上させることができる。
また、感温筒を覆う断熱カバーは、当該感温筒に着脱自在であるので、感温筒を冷媒配管に固定した後に取り付けることができる。 In the temperature sensor mounting structure of the present invention, the temperature sensing cylinder that houses the temperature sensor is fixed on the outer surface of the refrigerant pipe at an angle of 70 ° to 110 ° with respect to the pipe axis direction. It can also be attached to the curved pipe part of piping. Since the temperature of the bent tube can be detected, it is possible to expand the place where the temperature sensing tube accommodating the temperature sensor can be installed. Considering the working space around the installation location, the mounting angle can be determined within the range of 70 ° to 110 °, that is, within the range of 90 ° ± 20 °, so that workability can be improved. .
Moreover, since the heat insulation cover which covers a temperature sensing cylinder is detachable with respect to the said temperature sensing cylinder, it can be attached after fixing a temperature sensing cylinder to refrigerant | coolant piping.

（２）前記（１）の温度センサ取付構造において、前記断熱カバーが、感温筒の一端を挿入可能な開口を有する有底筒体からなり、この筒体の周壁には、軸方向に沿うスリットが前記開口から筒体の底部近傍まで形成されていることが好ましい。この場合、断熱カバーの開口に感温筒の一端を挿入し、その状態で、断熱カバーを感温筒の他端側に移動させることで、当該断熱カバーを感温筒に装着することができる。その際、断熱カバーには開口から筒体の底部近傍までスリットが形成されているので、このスリットの幅が広がる方向へ断熱カバーの周壁を変形させることが可能である。したがって、断熱カバーを容易に感温筒の外周に装着することができる。 (2) In the temperature sensor mounting structure according to (1), the heat insulating cover is formed of a bottomed cylindrical body having an opening into which one end of the temperature sensitive cylinder can be inserted, and the peripheral wall of the cylindrical body extends along the axial direction. It is preferable that the slit is formed from the opening to the vicinity of the bottom of the cylindrical body. In this case, one end of the temperature sensing cylinder is inserted into the opening of the heat insulation cover, and the heat insulation cover can be attached to the temperature sensing cylinder by moving the heat insulation cover to the other end side of the temperature sensing cylinder in that state. . At that time, since the slit is formed in the heat insulating cover from the opening to the vicinity of the bottom of the cylindrical body, it is possible to deform the peripheral wall of the heat insulating cover in the direction in which the width of the slit increases. Therefore, the heat insulating cover can be easily attached to the outer periphery of the temperature sensitive cylinder.

（３）前記（２）の温度センサ取付構造において、前記スリットの、開口側と反対側の端部に当該スリットが拡幅された逃げ部が形成されていることが好ましい。本発明では、感温筒は冷媒配管に対し点で接触する状態で固定される。この固定箇所では、感温筒と冷媒配管とが所定の角度で交差しているが、スリットが拡幅された逃げ部を形成することで、固定箇所における冷媒配管部分を前記逃げ部に配置させることができ、断熱カバーを感温筒の外周に密接して配設することが可能になる。その結果、断熱カバーによる断熱効果を充分に発揮させることができる。 (3) In the temperature sensor mounting structure according to (2), it is preferable that a relief portion where the slit is widened is formed at an end portion of the slit opposite to the opening side. In the present invention, the temperature sensing cylinder is fixed in a state of being in point contact with the refrigerant pipe. At this fixed location, the temperature sensing cylinder and the refrigerant pipe intersect at a predetermined angle, but by forming an escape portion with the slit widened, the refrigerant pipe portion at the fixed location is arranged at the escape portion. Thus, the heat insulating cover can be disposed in close contact with the outer periphery of the temperature sensitive cylinder. As a result, the heat insulating effect by the heat insulating cover can be sufficiently exhibited.

（４）前記（３）の温度センサ取付構造において、前記スリットと逃げ部とがＬ字形状を呈することが好ましい。Ｌ字形状の長辺部分をスリットとし、短辺部分を逃げ部とすることができる。スリットと逃げ部とが連続しており、加工（形成）が容易である。 (4) In the temperature sensor mounting structure according to (3), it is preferable that the slit and the relief portion have an L shape. The long side portion of the L shape can be a slit and the short side portion can be a relief. The slit and the relief portion are continuous, and processing (formation) is easy.

（５）前記（１）〜（４）の温度センサ取付構造において、前記断熱カバーが、断熱材からなる本体と、この本体の外側に設けられた外側カバーとで構成されていることが好ましい。外側カバーを設けることで、断熱材を損傷などから保護することができ、断熱カバーの耐久性を向上させることができる。 (5) In the temperature sensor mounting structure according to (1) to (4), it is preferable that the heat insulating cover includes a main body made of a heat insulating material and an outer cover provided outside the main body. By providing the outer cover, the heat insulating material can be protected from damage and the durability of the heat insulating cover can be improved.

（６）前記（５）の温度センサ取付構造において、前記外側カバーが、断熱カバーに形成されたスリットの少なくとも一部を塞ぐことが可能なシール部を有していることが好ましい。シール部により、断熱カバーのスリットを塞ぐことで、スリットから断熱カバー内部への空気の流入を遮断することができ、断熱性能を向上させることができると共に、断熱カバーの感温筒への固定を確実にすることができる。 (6) In the temperature sensor mounting structure according to (5), it is preferable that the outer cover has a seal portion capable of closing at least a part of a slit formed in the heat insulating cover. By closing the slit of the heat insulating cover with the seal part, the inflow of air from the slit to the inside of the heat insulating cover can be blocked, the heat insulating performance can be improved, and the heat insulating cover can be fixed to the temperature sensing cylinder. Can be sure.

（７）前記（６）の温度センサ取付構造において、前記シール部が、接着剤層と、この接着剤層を覆う離形紙とを有することが好ましい。断熱カバーを感温筒に装着した後に、離形紙を剥がし、接着剤層によりシール部を対応する外側カバーに接着することで、簡単に断熱カバーのスリットを塞ぐことができる。 (7) In the temperature sensor mounting structure according to (6), it is preferable that the seal portion includes an adhesive layer and a release paper that covers the adhesive layer. After attaching the heat insulating cover to the temperature sensitive tube, the release paper is peeled off, and the seal portion is adhered to the corresponding outer cover by the adhesive layer, so that the slit of the heat insulating cover can be easily closed.

本発明の温度センサ取付構造によれば、適用範囲が広く、且つ作業性を向上させることができる。   According to the temperature sensor mounting structure of the present invention, the application range is wide and workability can be improved.

本発明の温度センサ取付構造の一実施の形態の斜視説明図である。It is a perspective explanatory view of an embodiment of a temperature sensor mounting structure of the present invention. 図１に示される温度センサ取付構造の軸方向断面説明図である。It is an axial sectional view of the temperature sensor mounting structure shown in FIG. 図１に示される断熱カバーの斜視説明図である。It is a perspective explanatory view of the heat insulation cover shown by FIG. （ａ）は図１に示される断熱カバーの正面図であり、（ｂ）は開口側からみた側面図である。(A) is a front view of the heat insulation cover shown by FIG. 1, (b) is the side view seen from the opening side. 取付バネの斜視説明図である。It is a perspective explanatory view of a mounting spring. 図１に示される温度センサ取付構造の適用例の斜視説明図である。It is a perspective explanatory view of an application example of the temperature sensor mounting structure shown in FIG.

以下、添付図面を参照しつつ、本発明の温度センサ取付構造の実施の形態を詳細に説明する。
図１は、本発明の一実施の形態に係る温度センサ取付構造Ｔの斜視説明図であり、図２は、図１に示される温度センサ取付構造Ｔの軸方向断面説明図である。温度センサ取付構造Ｔは、冷媒配管Ｐ内を流れる冷媒の温度を間接的に検出するものであり、感温筒１と、温度センサであるサーミスタ２と、断熱カバー３と、取付バネ４とを備えている。 Hereinafter, embodiments of a temperature sensor mounting structure according to the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 is a perspective explanatory view of a temperature sensor mounting structure T according to an embodiment of the present invention, and FIG. 2 is an axial sectional explanatory view of the temperature sensor mounting structure T shown in FIG. The temperature sensor mounting structure T indirectly detects the temperature of the refrigerant flowing in the refrigerant pipe P. The temperature sensor mounting structure T includes a temperature sensitive cylinder 1, a thermistor 2 that is a temperature sensor, a heat insulating cover 3, and a mounting spring 4. I have.

感温筒１は、熱伝導性の優れた銅で作製されており、有底円筒形状又は両端とも開口した円筒形状を呈している。感温筒１の内部にサーミスタ２が収容される。サーミスタ２は、その外周面が感温筒２の内周面に密接するように当該感温筒２の内部に配設される。感温筒１の温度をサーミスタ２で検出することにより冷媒配管Ｐ内を流れる冷媒の温度を間接的に検出することができる。感温筒１は、ろう付けにより曲管からなる冷媒配管Ｐ（冷媒配管の曲管部）の外周面の所定箇所に当該冷媒配管Ｐの管軸方向に対して７０°〜１１０°の角度をなして固定される。すなわち、管軸方向に対して９０°±２０°の角度をなして固定される。後述するサーミスタ２の感温素子は、当該サーミスタ２の先端側に配設され、また、このサーミスタ２は感温素子が配設された先端側から感温筒１内に収容されるので、感温筒１は、その底面付近の周壁が冷媒配管Ｐにろう付けされる。これにより、冷媒配管Ｐからサーミスタ２の感温素子への熱伝導性を良くすることができる。   The temperature sensing cylinder 1 is made of copper having excellent thermal conductivity, and has a bottomed cylindrical shape or a cylindrical shape having both ends opened. A thermistor 2 is accommodated inside the temperature sensing cylinder 1. The thermistor 2 is disposed inside the temperature sensing cylinder 2 so that the outer circumferential surface thereof is in close contact with the inner circumferential surface of the temperature sensing cylinder 2. By detecting the temperature of the temperature sensitive cylinder 1 with the thermistor 2, the temperature of the refrigerant flowing in the refrigerant pipe P can be indirectly detected. The temperature sensing cylinder 1 has an angle of 70 ° to 110 ° with respect to the pipe axis direction of the refrigerant pipe P at a predetermined position on the outer peripheral surface of the refrigerant pipe P (curved pipe portion of the refrigerant pipe) made of a curved pipe by brazing. Fixed. That is, it is fixed at an angle of 90 ° ± 20 ° with respect to the tube axis direction. A thermosensitive element of the thermistor 2 to be described later is disposed on the distal end side of the thermistor 2, and the thermistor 2 is accommodated in the thermosensitive cylinder 1 from the distal end side where the thermosensitive element is disposed. As for the warm cylinder 1, the surrounding wall near the bottom face is brazed to the refrigerant pipe P. Thereby, the heat conductivity from the refrigerant | coolant piping P to the temperature sensing element of the thermistor 2 can be improved.

従来の感温筒は冷媒配管に沿って平行に配設される構成であるので、その適用箇所が制限されているが、本発明のように管軸方向に対して７０°〜１１０°の角度をなして感温筒１を冷媒配管Ｐに固設することで、直管部だけでなく図１に示したような曲管部にも取り付けることができる。   Since the conventional temperature-sensitive cylinder is configured to be arranged in parallel along the refrigerant pipe, its application location is limited, but the angle of 70 ° to 110 ° with respect to the tube axis direction as in the present invention. By fixing the temperature sensing tube 1 to the refrigerant pipe P, it can be attached not only to the straight pipe part but also to the curved pipe part as shown in FIG.

感温筒１の取付角度は、前記７０°〜１１０°の範囲内で感温筒１の設置箇所周囲の作業スペースなどを考慮して決めることができるので、温度センサ取付作業の作業性を向上させることができる。   Since the mounting angle of the temperature sensing tube 1 can be determined in consideration of the work space around the installation location of the temperature sensing tube 1 within the range of 70 ° to 110 °, the workability of the temperature sensor mounting work is improved. Can be made.

サーミスタ２は円柱形状を呈しており、その先端側（感温筒１の内部に最初に挿入される側）の内部には、例えば金属酸化物系の半導体からなる感温素子（図示せず）が配置され、後端側端面からはリード線２ａが引き出されている。   The thermistor 2 has a cylindrical shape, and a temperature sensing element (not shown) made of, for example, a metal oxide based semiconductor is provided inside the tip end side (side first inserted into the temperature sensing cylinder 1). Is arranged, and the lead wire 2a is drawn from the end surface on the rear end side.

図３は、図１に示される断熱カバーの斜視説明図であり、図４の（ａ）は図１に示される断熱カバーの正面図であり、同（ｂ）は開口側からみた側面図である。なお、分かり易くするために、図３では外側カバーの図示を省略している。
断熱カバー３は、感温筒１及びこの感温筒１内に収容されているサーミスタ２が周囲の空気温度から受ける影響を低減させるために、当該感温筒１の外側に配設されるものであり、感温筒１の一端（底部側端部）を挿入可能な開口６を有する有底筒形状を呈している。 3 is a perspective explanatory view of the heat insulating cover shown in FIG. 1, FIG. 4 (a) is a front view of the heat insulating cover shown in FIG. 1, and FIG. 3 (b) is a side view seen from the opening side. is there. For ease of understanding, the outer cover is not shown in FIG.
The heat insulating cover 3 is disposed outside the temperature sensing cylinder 1 in order to reduce the influence of the temperature sensing cylinder 1 and the thermistor 2 accommodated in the temperature sensing cylinder 1 from the ambient air temperature. And has a bottomed cylindrical shape having an opening 6 into which one end (bottom side end) of the temperature sensitive cylinder 1 can be inserted.

断熱カバー３は、断熱材からなる本体７と、この本体７の外側に設けられた外側カバー８とで構成されている。   The heat insulating cover 3 includes a main body 7 made of a heat insulating material and an outer cover 8 provided outside the main body 7.

本体７は、感温筒１が収容される筒状部７ａと、この筒状部７ａの一方の開口端（前記開口６と反対側の開口）を閉止する底部７ｂとからなっている。底部７ｂは、前記一方の開口端に熱溶着により固定されている。筒状部７ａと底部７ｂは一体成形することも可能であるが、これらを別々に製造し、筒状部７ａの一方の開口端への底部７ｂの熱溶着により本体７を製造することで、製造が簡単になり、製造コストを抑えることができる。
筒状部７ａの内径は、感温筒１の外径と同じか、それよりもわずかに大きく設定されている。したがって、感温筒１に断熱カバー３を装着したときに、感温筒１の外周面と断熱カバー３の筒状部７ａの内周面との隙間をなくし、両者の密着性を向上させることができる。 The main body 7 includes a cylindrical portion 7a in which the temperature sensing cylinder 1 is accommodated, and a bottom portion 7b that closes one opening end (opening opposite to the opening 6) of the cylindrical portion 7a. The bottom 7b is fixed to the one opening end by heat welding. Although the cylindrical part 7a and the bottom part 7b can be integrally molded, these are manufactured separately, and by manufacturing the main body 7 by thermal welding of the bottom part 7b to one opening end of the cylindrical part 7a, Manufacturing is simplified and manufacturing costs can be reduced.
The inner diameter of the cylindrical portion 7 a is set to be the same as or slightly larger than the outer diameter of the temperature-sensitive cylinder 1. Therefore, when the heat-insulating cover 3 is attached to the temperature-sensitive cylinder 1, the gap between the outer peripheral surface of the temperature-sensitive cylinder 1 and the inner peripheral surface of the tubular portion 7a of the heat-insulating cover 3 is eliminated, and the adhesion between the two is improved. Can do.

筒状部７ａの周壁には、軸方向に沿うスリット９が前記開口６から底部７ｂの近傍まで形成されている。スリット９は、図４の（ｂ）に示されるように、軸方向に垂直な断面の形状が扇形状であり、この扇の角度αは３０°である。開口６から本体７の底部７ｂ近傍までのスリット９を形成することで、このスリット９の幅が広がる方向へ筒状部７ａの周壁を変形させることが可能となり、断熱カバー３を容易に感温筒１の外周に装着することができる。   A slit 9 along the axial direction is formed on the peripheral wall of the cylindrical portion 7a from the opening 6 to the vicinity of the bottom portion 7b. As shown in FIG. 4B, the slit 9 has a fan-shaped cross section perpendicular to the axial direction, and the angle α of the fan is 30 °. By forming the slit 9 from the opening 6 to the vicinity of the bottom 7b of the main body 7, the peripheral wall of the cylindrical portion 7a can be deformed in the direction in which the width of the slit 9 increases, and the heat insulating cover 3 can be easily temperature-sensitive. It can be mounted on the outer periphery of the tube 1.

前記スリット９の、開口９側と反対側の端部に当該スリット９が拡幅された逃げ部１０が形成されている。スリット９と逃げ部１０は全体としてＬ字形状を呈している。本発明では、感温筒１は冷媒配管Ｐに対し点で接触する状態で固定される。この固定箇所では、感温筒１と冷媒配管Ｐとが所定の角度で交差しているが、スリット９が拡幅された逃げ部１０を形成することで、固定箇所における冷媒配管部分を前記逃げ部１０に配置させることができ、断熱カバー３を感温筒１の外周に密接して配設することが可能になる。その結果、前記交差部分における感温筒１に周囲空気があたるのを抑制することができ、断熱カバー３による断熱効果を充分に発揮させることができる。前記交差部分の近傍にサーミスタ２の感温素子が配設されているので、この部分の感温筒１に周囲空気があたるのを抑制することで、冷媒配管Ｐの表面温度を正確に検出することができる。   A relief portion 10 in which the slit 9 is widened is formed at the end of the slit 9 opposite to the opening 9 side. The slit 9 and the relief portion 10 have an L shape as a whole. In the present invention, the temperature sensing cylinder 1 is fixed in a state where it contacts the refrigerant pipe P at a point. In this fixed location, the temperature sensing cylinder 1 and the refrigerant pipe P intersect at a predetermined angle. By forming the escape portion 10 in which the slit 9 is widened, the refrigerant pipe portion in the fixed location is connected to the escape portion. 10 and the heat insulating cover 3 can be disposed in close contact with the outer periphery of the temperature sensitive cylinder 1. As a result, it is possible to suppress the ambient air from hitting the temperature sensing cylinder 1 at the intersection, and the heat insulating effect of the heat insulating cover 3 can be sufficiently exhibited. Since the temperature sensing element of the thermistor 2 is disposed in the vicinity of the intersecting portion, the surface temperature of the refrigerant pipe P is accurately detected by suppressing the ambient air from hitting the temperature sensing tube 1 of this portion. be able to.

また、本実施の形態では、断熱カバー３の本体７は底部７ｂを有しており、感温筒１の先端部（この先端部にサーミスタ２の感温素子が配設されている）は当該底部７ｂ近傍に位置する。すなわち、感温筒１の先端部に周囲空気があたるのを前記底部７ｂで防いでおり、これにより冷媒配管Ｐの表面温度を正確に検出することができる。   Further, in the present embodiment, the main body 7 of the heat insulating cover 3 has a bottom portion 7b, and the tip portion of the temperature sensing tube 1 (the temperature sensing element of the thermistor 2 is disposed at the tip portion) Located in the vicinity of the bottom 7b. That is, the bottom portion 7b prevents ambient air from hitting the tip of the temperature sensitive cylinder 1, whereby the surface temperature of the refrigerant pipe P can be accurately detected.

前記逃げ部１０を構成する切り欠きないし凹所の形状は、本実施の形態のような矩形状に限定されるものではなく、感温筒１と冷媒配管Ｐの固定箇所における冷媒配管Ｐの形状に合わせて適宜選定することができる。周囲空気の温度が感温筒１に与える影響を減らすためには、逃げ部１０の縁部１０ａを冷媒配管Ｐの外周面に合わせた曲線状にして筒状体７ａが冷媒配管Ｐに密接するようにすることが好ましい。   The shape of the notch or the recess constituting the escape portion 10 is not limited to the rectangular shape as in the present embodiment, and the shape of the refrigerant pipe P at the fixed portion between the temperature-sensitive cylinder 1 and the refrigerant pipe P. Can be selected as appropriate. In order to reduce the influence of the temperature of the ambient air on the temperature sensing cylinder 1, the tubular body 7a is in close contact with the refrigerant pipe P by making the edge 10a of the escape portion 10 into a curved shape matching the outer peripheral surface of the refrigerant pipe P. It is preferable to do so.

本体７は、発泡スチレン、発泡ポリエチレンなどの断熱材で作製することができるが、一定の強度を有し、弾性変形が可能であることから、発泡スチレンで作製することが好ましい。   The main body 7 can be made of a heat insulating material such as foamed styrene or foamed polyethylene, but preferably has a certain strength and can be elastically deformed.

筒状部７ａの厚さｔ（図４の（ｂ）参照）は、本発明において特に限定されるものではなく、断熱材の種類、温度センサ周辺のスペース、必要とする断熱性能などを考慮して適宜選定することができるが、通常、３〜５ｍｍ程度である。   The thickness t (see FIG. 4B) of the cylindrical portion 7a is not particularly limited in the present invention, and takes into consideration the type of heat insulating material, the space around the temperature sensor, the required heat insulating performance, and the like. However, it is usually about 3 to 5 mm.

外側カバー８は、軟質の塩化ビニル樹脂などの合成樹脂製フィルムからなり、本体７の筒状部７ａの外周面に貼付されている。より詳細には、筒状部７ａの外周面のうち、スリット９だけが形成されている筒状部７ａ（逃げ部１０が形成されている部分を除く筒状部７ａ）の外周面に適宜の接着剤により貼付されている。図４の（ａ）では、分かりやすくするために、外側カバー８及び後述するシール部をハッチングで表現している。
外側カバー８としては、軟質の塩化ビニル樹脂以外の合成樹脂製フィルムを用いることもできるが、耐用性、柔軟性に優れ、前記本体７への巻き付けが容易であるので、軟質の塩化ビニル樹脂を用いるのが好ましい。 The outer cover 8 is made of a synthetic resin film such as soft vinyl chloride resin, and is affixed to the outer peripheral surface of the cylindrical portion 7 a of the main body 7. More specifically, among the outer peripheral surfaces of the cylindrical portion 7a, an appropriate outer peripheral surface of the cylindrical portion 7a in which only the slits 9 are formed (the cylindrical portion 7a excluding the portion where the relief portion 10 is formed) is appropriately provided. It is affixed with an adhesive. In FIG. 4A, the outer cover 8 and a seal portion to be described later are represented by hatching for easy understanding.
As the outer cover 8, a synthetic resin film other than a soft vinyl chloride resin can be used. However, since it is excellent in durability and flexibility and can be easily wound around the main body 7, a soft vinyl chloride resin is used. It is preferable to use it.

外側カバー８を設けることで、筒状部７ａを構成する断熱材を損傷などから保護することができ、断熱カバー３の耐久性を向上させることができる。なお、外側カバー８は、筒状部７ａの全外周面に設けることもでき、更には本体７の底部７ｂの外周面にも設けることができる。   By providing the outer cover 8, it is possible to protect the heat insulating material constituting the cylindrical portion 7 a from damage and the like, and to improve the durability of the heat insulating cover 3. The outer cover 8 can also be provided on the entire outer peripheral surface of the cylindrical portion 7 a, and can also be provided on the outer peripheral surface of the bottom portion 7 b of the main body 7.

本実施の形態では、前記外側カバー８の一端を延設して、筒状部７ａに形成されたスリット９を塞ぐことができるシール部１２としている。このシール部１２の内側面には、接着剤層１３と、この接着剤層１３を覆う離形紙１４とが設けられている。シール部１２により、断熱カバー３のスリット９を塞ぐことで、感温筒１に周囲の空気が触れるのを抑制することができ、断熱カバー３による断熱性能を向上させることができる。特に感温筒１を熱交換器に取り付ける場合、当該熱交換器と熱交換を行う空気流が感温筒１に当たるのを防ぐことができ、その結果、断熱カバー３による断熱性能を向上させて冷媒配管Ｐの表面温度を正確に検出することができる。また、弾性変形させた断熱カバー３が元の形状に戻り、感温筒１に密着することで、当該断熱カバー３の固定を行うことができるが、シール部１２を筒状部７ａの外周面に貼付することで、断熱カバー３の感温筒１への固定を確実にすることができる。   In the present embodiment, one end of the outer cover 8 is extended to form a seal portion 12 that can close the slit 9 formed in the tubular portion 7a. An adhesive layer 13 and a release paper 14 that covers the adhesive layer 13 are provided on the inner surface of the seal portion 12. By closing the slit 9 of the heat insulating cover 3 with the seal portion 12, it is possible to suppress the ambient air from touching the temperature-sensitive cylinder 1 and to improve the heat insulating performance of the heat insulating cover 3. In particular, when the temperature sensing tube 1 is attached to the heat exchanger, it is possible to prevent the air flow that exchanges heat with the heat exchanger from hitting the temperature sensing tube 1, and as a result, the heat insulating performance by the heat insulating cover 3 is improved. The surface temperature of the refrigerant pipe P can be accurately detected. In addition, the heat insulating cover 3 that has been elastically deformed returns to its original shape and comes into close contact with the temperature sensitive cylinder 1 so that the heat insulating cover 3 can be fixed, but the seal portion 12 is attached to the outer peripheral surface of the cylindrical portion 7a. By affixing to, it is possible to ensure the fixing of the heat insulating cover 3 to the temperature sensitive cylinder 1.

本実施の形態の場合、断熱カバー３を感温筒１に装着した後に、離形紙１４を剥がし、接着剤層１３によりシール部１２を対応する外側カバー８（シール部１２が形成された端部と反対側の端部）に接着することで、簡単に断熱カバー３のスリット９を塞ぐことができる。   In the case of the present embodiment, after the heat insulating cover 3 is attached to the temperature sensitive cylinder 1, the release paper 14 is peeled off, and the corresponding outer cover 8 (the end where the seal portion 12 is formed) is formed by the adhesive layer 13. The slit 9 of the heat insulating cover 3 can be easily closed by adhering to the end of the heat insulating cover 3.

取付バネ４は、感温筒１内に収容されたサーミスタ２を当該感温筒１の内周面に押圧して固定する部材であり、弾性を有する金属で作製されている。取付バネ４は、図５に示されるように、感温筒１の先端と当接する先端係止部４ａ、サーミスタ２を感温筒１の内周面に押圧する押圧部４ｂ、及び断熱カバー３を感温筒１の外周面に押圧する押圧部４ｃを有している。   The attachment spring 4 is a member that presses and fixes the thermistor 2 accommodated in the temperature sensitive cylinder 1 to the inner peripheral surface of the temperature sensitive cylinder 1 and is made of an elastic metal. As shown in FIG. 5, the attachment spring 4 includes a tip locking portion 4 a that contacts the tip of the temperature sensing tube 1, a pressing portion 4 b that presses the thermistor 2 against the inner peripheral surface of the temperature sensing tube 1, and the heat insulating cover 3. Has a pressing portion 4c that presses the outer peripheral surface of the temperature sensitive cylinder 1.

つぎに、サーミスタ２及び断熱カバー３の感温筒１への取付方法について説明する。
まず、冷媒配管Ｐの所定箇所にろう付けされた感温筒１に断熱カバー３を取り付ける。感温筒１の底面を断熱カバー３の開口６に挿入するようにして、断熱カバー３を感温筒１の外側に配設する。その際、スリット９によって断熱カバー３を広げるようにして感温筒１に装着することができるので、装着が容易である。 Next, a method for attaching the thermistor 2 and the heat insulating cover 3 to the temperature sensing cylinder 1 will be described.
First, the heat insulating cover 3 is attached to the temperature sensing cylinder 1 brazed to a predetermined location of the refrigerant pipe P. The heat insulating cover 3 is disposed outside the temperature sensitive cylinder 1 so that the bottom surface of the temperature sensitive cylinder 1 is inserted into the opening 6 of the heat insulating cover 3. At that time, since the heat insulating cover 3 can be widened by the slit 9 and can be attached to the temperature sensing cylinder 1, the attachment is easy.

ついで、取付バネ４を、その先端係止部４ａ側から感温筒１内に挿入する。また、押圧部４ｃによって断熱カバー３を感温筒１の外周面に押圧する。押圧部４ｃによって断熱カバー３を感温筒１の外周面に押圧することで、当該断熱カバー３を感温筒１に固定することができる。   Next, the mounting spring 4 is inserted into the temperature sensitive cylinder 1 from the tip locking portion 4a side. Further, the heat insulating cover 3 is pressed against the outer peripheral surface of the temperature sensitive cylinder 1 by the pressing portion 4 c. The heat insulating cover 3 can be fixed to the temperature sensitive cylinder 1 by pressing the heat insulating cover 3 against the outer peripheral surface of the temperature sensitive cylinder 1 by the pressing portion 4 c.

ついで、サーミスタ２を感温筒１内に挿入する。サーミスタ２を挿入することで、取付バネ４の押圧部４ｂが感温筒１の内周面側に押圧され、その反力によってサーミスタ２が感温筒１の内周面に押圧される。これにより、サーミスタ２を感温筒１の内周面に密着させることができ、感温筒１を介して冷媒配管Ｐの表面温度を正確に検出することができる。   Next, the thermistor 2 is inserted into the temperature sensitive cylinder 1. By inserting the thermistor 2, the pressing portion 4 b of the mounting spring 4 is pressed toward the inner peripheral surface side of the temperature sensing cylinder 1, and the thermistor 2 is pressed against the inner peripheral surface of the temperature sensing cylinder 1 by the reaction force. As a result, the thermistor 2 can be brought into close contact with the inner peripheral surface of the temperature sensing cylinder 1, and the surface temperature of the refrigerant pipe P can be accurately detected via the temperature sensing cylinder 1.

図６は、室内側熱交換器ＩのＵ字管２０に、管軸方向に直角にろう付けされた感温筒１の外側に断熱カバー３を装着した温度センサ取付構造の例を示している。曲管であるＵ字管２０に感温筒１を取り付けることで、冷媒配管Ｐの中間温度（飽和温度）を容易に取得することができる。Ｕ字管２０は、冷媒配管Ｐの端部、すなわち室内側熱交換器Ｉの端部に位置しているので、感温筒１のろう付け作業やサーミスタ２の取付作業及び断熱カバー３の装着作業の各作業スペースの確保が容易であり、作業性を向上させることができる。   FIG. 6 shows an example of a temperature sensor mounting structure in which the heat insulating cover 3 is attached to the outside of the temperature sensing tube 1 brazed to the U-shaped tube 20 of the indoor heat exchanger I at right angles to the tube axis direction. . By attaching the temperature sensing tube 1 to the U-shaped tube 20 which is a curved tube, the intermediate temperature (saturation temperature) of the refrigerant pipe P can be easily obtained. Since the U-shaped tube 20 is located at the end of the refrigerant pipe P, that is, the end of the indoor heat exchanger I, the U-tube 20 is brazed, the thermistor 2 is attached, and the heat insulating cover 3 is attached. It is easy to secure each work space for work, and workability can be improved.

１ 感温筒
２ サーミスタ（温度センサ）
３ 断熱カバー
４ 取付バネ
６ 開口
７ 本体
７ａ 筒状部
７ｂ 底部
８ 外側カバー
９ スリット
１０ 逃げ部
１２ シール部
２０ Ｕ字管
Ｔ 温度センサ取付構造
Ｐ 冷媒配管 1 Temperature sensing tube 2 Thermistor (temperature sensor)
DESCRIPTION OF SYMBOLS 3 Heat insulation cover 4 Mounting spring 6 Opening 7 Main body 7a Cylindrical part 7b Bottom part 8 Outer cover 9 Slit 10 Escape part 12 Seal part 20 U-shaped pipe T Temperature sensor attachment structure P Refrigerant piping

Claims (7)

曲管からなる冷媒配管（Ｐ）の外表面に管軸方向に対して７０°〜１１０°の角度をなして固設される感温筒（１）と、
この感温筒（１）の内周面に密接して設けられる温度センサ（２）と、
前記感温筒（１）を覆う着脱自在の断熱カバー（３）と
を備えたことを特徴とする温度センサ取付構造（Ｔ）。 A temperature sensing tube (1) fixed on the outer surface of the refrigerant pipe (P) made of a curved pipe at an angle of 70 ° to 110 ° with respect to the pipe axis direction;
A temperature sensor (2) provided in close contact with the inner peripheral surface of the temperature sensing tube (1);
A temperature sensor mounting structure (T) comprising: a detachable heat insulating cover (3) that covers the temperature sensitive cylinder (1). 前記断熱カバー（３）が、感温筒（１）の一端を挿入可能な開口（６）を有する有底筒体からなり、この筒体の周壁には、軸方向に沿うスリット（９）が前記開口（６）から筒体の底部近傍まで形成されている請求項１に記載の温度センサ取付構造（Ｔ）。   The heat insulating cover (3) is composed of a bottomed cylinder having an opening (6) into which one end of the temperature sensing cylinder (1) can be inserted, and a slit (9) along the axial direction is formed on the peripheral wall of the cylinder. The temperature sensor mounting structure (T) according to claim 1, wherein the temperature sensor mounting structure (T) is formed from the opening (6) to the vicinity of the bottom of the cylindrical body. 前記スリット（９）の、開口側と反対側の端部に当該スリット（９）が拡幅された逃げ部（１０）が形成されている請求項２に記載の温度センサ取付構造（Ｔ）。   The temperature sensor mounting structure (T) according to claim 2, wherein an escape portion (10) in which the slit (9) is widened is formed at an end portion of the slit (9) opposite to the opening side. 前記スリット（９）と逃げ部（１０）とがＬ字形状を呈する請求項３に記載の温度センサ取付構造（Ｔ）。   The temperature sensor mounting structure (T) according to claim 3, wherein the slit (9) and the relief portion (10) have an L shape. 前記断熱カバー（３）が、断熱材からなる本体（７）と、この本体（７）の外側に設けられた外側カバー（８）とで構成されている請求項１〜４のいずれかに記載の温度センサ取付構造（Ｔ）。   The said heat insulation cover (3) is comprised in the main body (7) which consists of a heat insulating material, and the outer side cover (8) provided in the outer side of this main body (7). Temperature sensor mounting structure (T). 前記外側カバー（８）が、断熱カバー（３）に形成されたスリット（９）の少なくとも一部を塞ぐことが可能なシール部（１２）を有している請求項５に記載の温度センサ取付構造（Ｔ）。   The temperature sensor mounting according to claim 5, wherein the outer cover (8) has a seal portion (12) capable of closing at least a part of a slit (9) formed in the heat insulating cover (3). Structure (T). 前記シール部（１２）が、接着剤層（１３）と、この接着剤層（１３）を覆う離形紙（１４）とを有する請求項６に記載の温度センサ取付構造（Ｔ）。
The temperature sensor mounting structure (T) according to claim 6, wherein the seal portion (12) includes an adhesive layer (13) and a release paper (14) covering the adhesive layer (13).
JP2010087089A 2010-04-05 2010-04-05 Temperature sensor mounting structure Expired - Fee Related JP5240226B2 (en)

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JP2013164202A (en) * 2012-02-10 2013-08-22 Daikin Industries Ltd Indoor unit
JP2014215010A (en) * 2013-04-30 2014-11-17 ダイキン工業株式会社 Air conditioner indoor unit
JPWO2017195336A1 (en) * 2016-05-12 2018-11-29 三菱電機株式会社 Refrigerant leak detection mechanism

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JP2013164202A (en) * 2012-02-10 2013-08-22 Daikin Industries Ltd Indoor unit
JP2014215010A (en) * 2013-04-30 2014-11-17 ダイキン工業株式会社 Air conditioner indoor unit
JPWO2017195336A1 (en) * 2016-05-12 2018-11-29 三菱電機株式会社 Refrigerant leak detection mechanism

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