JP5737164B2 - Heat supply system - Google Patents

Heat supply system Download PDF

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JP5737164B2
JP5737164B2 JP2011273551A JP2011273551A JP5737164B2 JP 5737164 B2 JP5737164 B2 JP 5737164B2 JP 2011273551 A JP2011273551 A JP 2011273551A JP 2011273551 A JP2011273551 A JP 2011273551A JP 5737164 B2 JP5737164 B2 JP 5737164B2
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pipe
nut
hot water
water
liquid
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JP2013124811A (en
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正純 知崎
正純 知崎
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Mitsubishi Electric Corp
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Description

本発明は、熱供給システムに関する。   The present invention relates to a heat supply system.

ヒートポンプ等の熱源を用いた貯湯式給湯システムや温水暖房システムなどの熱供給システムが広く用いられている。熱供給システムには、温水の通る配管を接続する配管接続部が多数存在するが、シール部材の劣化等により、配管接続部からの水漏れが発生する場合がある。このため、配管接続部からの水漏れを自動で検知することが望まれている。   Heat supply systems such as a hot water storage hot water supply system and a hot water heating system using a heat source such as a heat pump are widely used. In the heat supply system, there are a large number of pipe connection portions that connect pipes through which hot water passes, but water leakage from the pipe connection portions may occur due to deterioration of the seal member or the like. For this reason, it is desired to automatically detect water leakage from the pipe connection.

特許文献１には、ボルト等の緩みを検出しうる機能を有した座金部材を被締結部材との間に介挿し、ボルト等が緩んだ場合には電気的又は機械的等の情報として外部へ取り出すことにより、ボルト等から離隔した場所でも緩みを検知できる緩み検出方法が開示されている。上記座金部材は、圧電素子、誘電体セラミックス素子、電極、半導体感圧素子等を用いて、緩みを検出する。また、特許文献２には、ナット側面にひずみゲージを設け、ナット側面部のひずみ、応力等からボルトの緩みを検出する方法が開示されている。   In Patent Document 1, a washer member having a function capable of detecting looseness of a bolt or the like is inserted between a member to be fastened, and when the bolt or the like is loosened, information such as electrical or mechanical information is transmitted to the outside. A looseness detection method is disclosed in which the looseness can be detected even at a location separated from a bolt or the like by taking out. The washer member detects looseness using a piezoelectric element, a dielectric ceramic element, an electrode, a semiconductor pressure sensitive element, or the like. Further, Patent Document 2 discloses a method in which a strain gauge is provided on the side surface of the nut, and the looseness of the bolt is detected from the strain, stress or the like of the side surface portion of the nut.

特開昭６０−３９５２３号公報JP 60-39523 A 特開平１−１３１４２２号公報Japanese Patent Laid-Open No. 1-1131422

上述したように、ボルト等の金属製締結部材の緩みを検知する技術は従来より知られている。しかしながら、配管接続部からの水漏れを検知する技術は存在していない。   As described above, a technique for detecting looseness of a metal fastening member such as a bolt is conventionally known. However, there is no technique for detecting water leakage from the pipe connection.

本発明は、上述のような課題を解決するためになされたもので、配管接続部からの液漏れを検知することのできる熱供給システムを提供することを目的とする。   SUMMARY An advantage of some aspects of the invention is that it provides a heat supply system capable of detecting a liquid leak from a pipe connection portion.

本発明に係る熱供給システムは、
液体を加熱する加熱手段と、雄ねじが形成された接続ねじ部と、雄ねじに螺合する雌ねじが形成されたナットと、液体が通る配管と接続ねじ部との間に介挿され、ナットを締め付けることにより配管と接続ねじ部との間で圧縮される、弾性材料で構成されたシール部材とを有し、配管を接続するねじ式の配管接続部と、配管接続部に設置され、配管接続部のひずみを検出するひずみゲージと、ひずみゲージの信号に基づく検出値と、所定の閾値とを比較することにより、シール部材の経年劣化による配管接続部からの液漏れを検知する液漏れ検知手段と、を備え、液漏れ検知手段は、検出値が閾値に比べて低くなった場合には、配管接続部の液漏れ、または液漏れのおそれ、があると判定するものである。
The heat supply system according to the present invention includes:
A heating means for heating the liquid, a connection screw portion formed with a male screw, a nut formed with a female screw to be screwed into the male screw, and a pipe through which the liquid passes and the connection screw portion are inserted to tighten the nut. And a sealing member made of an elastic material, which is compressed between the pipe and the connecting screw part, and is installed in the pipe connecting part, the screw type pipe connecting part for connecting the pipe, and the pipe connecting part a strain gauge for detecting a strain of the strain detection value based on the signal of the gauge, by comparing with a predetermined threshold value, leakage detecting means for detecting leakage of liquid from pipe connecting portion due to aging deterioration of the sealing member The liquid leakage detection means determines that there is a risk of liquid leakage or a liquid leakage at the pipe connection part when the detected value is lower than the threshold value.

本発明によれば、配管接続部からの液漏れを確実に検知することが可能となる。   According to the present invention, it is possible to reliably detect liquid leakage from the pipe connection portion.

本発明の実施の形態１の熱供給システム（給湯暖房システム）を示す構成図である。It is a block diagram which shows the heat supply system (hot-water supply heating system) of Embodiment 1 of this invention. 図１に示す給湯暖房システムが備える配管接続部の断面図である。It is sectional drawing of the piping connection part with which the hot-water supply heating system shown in FIG. ひずみゲージから検知部に送られた信号から求められた、ナットにかかる応力の時間経過を表した概念図である。It is the conceptual diagram showing the time passage of the stress concerning a nut calculated | required from the signal sent to the detection part from the strain gauge.

以下、図面を参照して本発明の実施の形態について説明する。なお、各図において共通する要素には、同一の符号を付して、重複する説明を省略する。   Embodiments of the present invention will be described below with reference to the drawings. In addition, the same code | symbol is attached | subjected to the element which is common in each figure, and the overlapping description is abbreviate | omitted.

実施の形態１．
図１は、本発明の実施の形態１の熱供給システム（給湯暖房システム）を示す構成図である。なお、本実施形態では、給湯と暖房との両方を行う給湯暖房システムに本発明の熱供給システムを適用した場合について説明するが、本発明の熱供給システムは、給湯と暖房との何れか一方を行うものであってもよい。 Embodiment 1 FIG.
FIG. 1 is a configuration diagram showing a heat supply system (hot water supply / heating system) according to Embodiment 1 of the present invention. In the present embodiment, the case where the heat supply system of the present invention is applied to a hot water supply and heating system that performs both hot water supply and heating will be described. However, the heat supply system of the present invention is either one of hot water supply or heating. It may be what performs.

図１に示すように、本実施形態の給湯暖房システムは、貯湯タンク１と、貯湯タンク１内に設置された水熱交換器２と、加熱手段としてのヒートポンプ熱源機３と、水回路内の水を循環させる循環ポンプ５と、水回路の流路を切り換える電磁三方弁６と、温水暖房器具７とを備えている。   As shown in FIG. 1, a hot water supply and heating system of the present embodiment includes a hot water storage tank 1, a water heat exchanger 2 installed in the hot water storage tank 1, a heat pump heat source device 3 as a heating means, and a water circuit. A circulation pump 5 for circulating water, an electromagnetic three-way valve 6 for switching the flow path of the water circuit, and a hot water heater 7 are provided.

ヒートポンプ熱源機３内には、圧縮機と、水冷媒熱交換器４（凝縮器）と、膨張装置と、蒸発器とが順次接続されて冷媒が循環する冷凍サイクルにより水を加熱するヒートポンプ回路が設けられている。水冷媒熱交換器４では、冷媒との熱交換により水が加熱され、温水となる。この温水は、配管２２および循環ポンプ５を通って、電磁三方弁６に送られる。電磁三方弁６は、温水の流路を、水熱交換器２に繋がる配管１３と、温水暖房器具７に繋がる配管２３とに切り換え可能になっている。   In the heat pump heat source unit 3, there is a heat pump circuit that heats water by a refrigeration cycle in which a compressor, a water refrigerant heat exchanger 4 (condenser), an expansion device, and an evaporator are sequentially connected to circulate the refrigerant. Is provided. In the water-refrigerant heat exchanger 4, water is heated by heat exchange with the refrigerant and becomes hot water. This hot water is sent to the electromagnetic three-way valve 6 through the pipe 22 and the circulation pump 5. The electromagnetic three-way valve 6 can switch the flow path of the hot water between a pipe 13 connected to the water heat exchanger 2 and a pipe 23 connected to the hot water heater 7.

電磁三方弁６から配管１３を通って水熱交換器２に送られた温水は、貯湯タンク１内の水と熱交換することにより温度低下し、配管１２および２１を通って水冷媒熱交換器４に戻り、再循環する。貯湯タンク１内の水は、水熱交換器２を通る温水により加熱され、湯となって貯湯タンク１内に貯留される。貯湯タンク１の下部には給水配管１０が接続されている。水道等の水源からの水が給水配管１０を通って貯湯タンク１内に供給される。貯湯タンク１の上部には出湯配管１１が接続されている。貯湯タンク１内に貯留された湯は、出湯配管１１を通って、例えば浴槽、蛇口、シャワーなどの需要端へ供給される。   The hot water sent from the electromagnetic three-way valve 6 through the pipe 13 to the water heat exchanger 2 is lowered in temperature by exchanging heat with the water in the hot water storage tank 1, and passes through the pipes 12 and 21 to be a water refrigerant heat exchanger. Return to 4 and recirculate. The water in the hot water storage tank 1 is heated by the hot water passing through the water heat exchanger 2 and is stored in the hot water storage tank 1 as hot water. A water supply pipe 10 is connected to the lower part of the hot water storage tank 1. Water from a water source such as water is supplied into the hot water storage tank 1 through the water supply pipe 10. A hot water discharge pipe 11 is connected to the upper part of the hot water storage tank 1. Hot water stored in the hot water storage tank 1 is supplied to a demand end such as a bathtub, a faucet, and a shower through the hot water supply pipe 11.

温水暖房器具７は、例えば床暖房や室内空気暖房などを行うための放熱器である。電磁三方弁６から配管２３を通って温水暖房器具７に送られた温水は、室内を暖房することで放熱して温度低下し、配管２４および２１を通って水冷媒熱交換器４に戻り、再循環する。   The hot water heater 7 is a radiator for performing, for example, floor heating or indoor air heating. The hot water sent from the electromagnetic three-way valve 6 through the pipe 23 to the hot water heater 7 is radiated and heated by heating the room, and returns to the water refrigerant heat exchanger 4 through the pipes 24 and 21. Recirculate.

なお、本実施形態では、水熱交換器２によって貯湯タンク１内の水を加熱するものとして説明したが、本発明では、ヒートポンプ熱源機３で加熱された温水をそのまま貯湯タンク１内に貯留する構成であってもよい。また、本実施形態では、水熱交換器２および温水暖房器具７に水が循環するものとして説明したが、本発明では、水以外の例えば不凍液等の液体（熱媒体）をヒートポンプ熱源機３等の加熱手段により加熱して水熱交換器２および温水暖房器具７に循環させる構成であってもよい。また、本発明における加熱手段は、ヒートポンプ式のものに限定されるものではなく、例えば太陽熱を利用するもの、電気ヒータによるもの、燃焼の熱を利用するもの、廃熱を利用するものなどであってもよい。   In the present embodiment, the water in the hot water storage tank 1 is heated by the water heat exchanger 2, but in the present invention, the hot water heated by the heat pump heat source unit 3 is stored in the hot water storage tank 1 as it is. It may be a configuration. Moreover, although this embodiment demonstrated that water circulates to the water heat exchanger 2 and the hot water heater 7, in the present invention, a liquid (heat medium) such as antifreeze liquid other than water is used as the heat pump heat source unit 3 or the like. It may be configured to be heated by the heating means and circulated through the water heat exchanger 2 and the hot water heater 7. Further, the heating means in the present invention is not limited to the heat pump type, and for example, those using solar heat, those using an electric heater, those using combustion heat, those using waste heat, etc. May be.

図２は、図１に示す給湯暖房システムが備える配管接続部の断面図である。図１に示す給湯暖房システムは、上述した各配管の接続部のうちの少なくとも１箇所が、図２に示す配管接続部で構成されている。図２に示す配管接続部は、雄ねじが形成された接続ねじ部１５と、この接続ねじ部１５に接続される配管１６と、接続ねじ部１５の雄ねじに螺合する雌ねじが形成されたナット１４と、接続ねじ部１５と配管１６との間に介挿されたシール部材１７とを有している。接続ねじ部１５内には、配管１６内と連通する流路が形成されている。配管１６の端部には、フランジ１６ａが形成されている。フランジ１６ａにナット１４が係合することにより、配管１６が接続ねじ部１５に固定されている。シール部材１７は、例えばゴム等の弾性材料で構成され、中央に孔の開いた円盤状をなしており、接続ねじ部１５の端面とフランジ１６ａとの間に挟持されている。ナット１４を締め付けることにより、接続ねじ部１５の端面とフランジ１６ａとの間でシール部材１７が圧縮される。このシール部材１７により、配管接続部の液密性が確保されている。   FIG. 2 is a cross-sectional view of a pipe connection portion provided in the hot water supply / heating system shown in FIG. 1. In the hot water supply and heating system shown in FIG. 1, at least one of the connection portions of the above-described pipes is configured with the pipe connection portion shown in FIG. 2. The pipe connecting portion shown in FIG. 2 includes a connecting screw portion 15 in which a male screw is formed, a pipe 16 connected to the connecting screw portion 15, and a nut 14 in which a female screw that is screwed into the male screw of the connecting screw portion 15 is formed. And a seal member 17 interposed between the connection screw portion 15 and the pipe 16. A flow path communicating with the inside of the pipe 16 is formed in the connection screw portion 15. A flange 16 a is formed at the end of the pipe 16. The pipe 16 is fixed to the connection screw portion 15 by the nut 14 engaging with the flange 16a. The seal member 17 is made of an elastic material such as rubber, has a disk shape with a hole in the center, and is sandwiched between the end surface of the connection screw portion 15 and the flange 16a. By tightening the nut 14, the seal member 17 is compressed between the end surface of the connection screw portion 15 and the flange 16 a. The seal member 17 ensures liquid tightness of the pipe connection portion.

ナット１４の側面には、ひずみゲージ１８が貼り付けられている。ひずみゲージ１８の信号は、例えば貯湯タンク１の付近等に配置される検知部１９（検知手段）に送られ、解析される。   A strain gauge 18 is attached to the side surface of the nut 14. The signal of the strain gauge 18 is sent to a detection unit 19 (detection means) disposed in the vicinity of the hot water storage tank 1, for example, and analyzed.

図３は、ひずみゲージ１８から検知部１９に送られた信号から求められた、ナット１４にかかる応力の時間経過を表した概念図である。ナット１４にかかる応力が低下するほど、シール部材１７に作用する押圧力は低下する。ナット１４にかかる応力が、所定の水漏れ閾値より低くなると、シール部材１７が液密性を確保できなくなり、水漏れ（液漏れ）のおそれがあると判定できる。このため、検知部１９は、ひずみゲージ１８からの信号に基づいて求めたナット１４にかかる応力が水漏れ閾値より低くなった場合には、配管接続部の水漏れ（または水漏れのおそれ）があると判定する。このようにして、水漏れの早期発見あるいは予防をすることができる。なお、上記水漏れ閾値は、ナット１４、接続ねじ部１５、配管１６、シール部材１７の組合せにて応力と水漏れとの関係を予め測定することで得ることができ、検知部１９に予め記憶されている。   FIG. 3 is a conceptual diagram showing the time course of the stress applied to the nut 14, which is obtained from the signal sent from the strain gauge 18 to the detection unit 19. As the stress applied to the nut 14 decreases, the pressing force acting on the seal member 17 decreases. When the stress applied to the nut 14 is lower than a predetermined water leak threshold, it is possible to determine that the seal member 17 cannot secure liquid tightness and there is a risk of water leak (liquid leak). For this reason, when the stress applied to the nut 14 obtained based on the signal from the strain gauge 18 is lower than the water leakage threshold, the detection unit 19 causes water leakage (or risk of water leakage) at the pipe connection portion. Judge that there is. In this way, early detection or prevention of water leakage can be performed. The water leak threshold value can be obtained by measuring in advance the relationship between stress and water leak using a combination of the nut 14, the connecting screw portion 15, the piping 16, and the seal member 17, and is stored in the detection unit 19 in advance. Has been.

検知部１９は、配管接続部の水漏れを検知した場合には、その旨を例えば表示装置、警報装置などの報知手段（図示せず）を用いて、使用者に報知することが好ましい。また、検知部１９による検知結果を給湯暖房システムのシステム制御に反映させるようにしてもよい。例えば、検知部１９により配管接続部の水漏れが検知された場合には、循環ポンプ５を停止させる等の制御を行うようにしてもよい。   When the detection unit 19 detects a water leak in the pipe connection unit, it is preferable to notify the user to that effect using notification means (not shown) such as a display device or an alarm device. Moreover, you may make it reflect the detection result by the detection part 19 in the system control of a hot-water supply heating system. For example, when the detection unit 19 detects a water leak in the pipe connection unit, control such as stopping the circulation pump 5 may be performed.

一般に、ナット１４および接続ねじ部１５は、金属材料で構成されるが、同材質とは限らない。一方で、配管接続部を含む一連の水回路を流れる水の温度は、給湯暖房システムの運転状態に応じて、例えば１０〜８０℃程度の範囲で変化する。このため、配管接続部の温度もその範囲で変化する。したがって、配管接続部の温度変化が繰り返されるたびに、ナット１４と接続ねじ部１５との線膨張係数の違いにより、ナット１４と接続ねじ部１５との間に熱応力が発生する。これにより、ナット１４と接続ねじ部１５との間の締結が経年的に弱くなる場合がある。本実施形態によれば、このような原因で生ずる配管接続部の水漏れを確実に検知することができる。   In general, the nut 14 and the connection screw portion 15 are made of a metal material, but are not necessarily the same material. On the other hand, the temperature of the water flowing through the series of water circuits including the pipe connection portion varies in the range of about 10 to 80 ° C., for example, according to the operation state of the hot water supply and heating system. For this reason, the temperature of a pipe connection part also changes in the range. Therefore, whenever the temperature change of the pipe connection portion is repeated, a thermal stress is generated between the nut 14 and the connection screw portion 15 due to a difference in linear expansion coefficient between the nut 14 and the connection screw portion 15. Thereby, the fastening between the nut 14 and the connection screw part 15 may become weak over time. According to the present embodiment, it is possible to reliably detect water leakage at the pipe connection portion caused by such a cause.

また、シール部材１７を構成する弾性材料は、圧縮されることで経年的に劣化し、反発力が低下する。シール部材１７の反発力が低下すると、ナット１４にかかる応力も低下する。このため、本実施形態によれば、ナット１４にかかる応力の経年的な低下を検出することにより、シール部材１７の経年劣化による配管接続部の水漏れを確実に検知することができる。   Moreover, the elastic material which comprises the sealing member 17 will deteriorate over time by being compressed, and a repulsive force will fall. When the repulsive force of the seal member 17 decreases, the stress applied to the nut 14 also decreases. For this reason, according to the present embodiment, it is possible to reliably detect the water leakage of the pipe connection portion due to the aging deterioration of the seal member 17 by detecting the aging of the stress applied to the nut 14.

また、本実施形態では、図１に示す給湯暖房システムの製造ラインでの組立工程、あるいはメンテナンス時の部品交換において、シール部材１７の入れ忘れを次のようにして検知することもできる。ナット１４にかかる応力は、上述した経年的な応力低下を示すほかに、ナット１４を締め付けた直後に生ずる初期的な応力低下を示す。これは、シール部材１７を構成する弾性材料の反発力が、ナット１４の締め付けによる圧縮力を受けた直後に、初期的な低下を示すことに起因している。これに対し、シール部材１７を入れ忘れてナット１４を締め付けた場合には、ナット１４と接続ねじ部１５との金属部品のみの締結となるため、その後にナット１４にかかる応力が初期的な低下を示すことはない。そこで、組立工程や部品交換時においてナット１４を締め付けた後の所定時間において、ひずみゲージ１８から検知部１９に送られる信号を解析し、ナット１４にかかる応力が初期的な低下傾向を示すかどうかを判断する。その結果、ナット１４にかかる応力が初期的な低下傾向を示した場合には、シール部材１７が入れられていると判定することができる。これに対し、ナット１４にかかる応力が初期的な低下傾向を示さない場合（ナット１４にかかる応力が一定値を保つ場合）には、シール部材１７が入れ忘れられていると判定することができる。   Moreover, in this embodiment, it is also possible to detect forgetting to put the seal member 17 in the assembling process in the production line of the hot water supply / heating system shown in FIG. The stress applied to the nut 14 indicates the initial stress decrease that occurs immediately after the nut 14 is tightened, in addition to the above-described stress decrease over time. This is due to the fact that the repulsive force of the elastic material constituting the seal member 17 shows an initial decrease immediately after receiving the compressive force due to the tightening of the nut 14. On the other hand, when the nut 14 is tightened with the seal member 17 forgotten, only the metal parts of the nut 14 and the connecting screw portion 15 are fastened, and thereafter the stress applied to the nut 14 is initially reduced. There is no indication. Therefore, whether or not the stress applied to the nut 14 shows an initial decreasing tendency is analyzed by analyzing a signal sent from the strain gauge 18 to the detection unit 19 at a predetermined time after the nut 14 is tightened during the assembly process or the part replacement. Judging. As a result, when the stress applied to the nut 14 shows an initial decreasing tendency, it can be determined that the seal member 17 is inserted. On the other hand, when the stress applied to the nut 14 does not show an initial decreasing tendency (when the stress applied to the nut 14 maintains a constant value), it can be determined that the seal member 17 is forgotten to be inserted.

以上説明した実施の形態では、ひずみゲージ１８の信号から求められた応力を閾値と比較することにより水漏れ（液漏れ）やシール部材１７の入れ忘れを検知しているが、本発明では、ひずみゲージ１８の信号から求められたひずみを閾値と比較してもよい。また、本実施形態では、ナット１４側にひずみゲージ１８を設置しているが、本発明では、接続ねじ部１５側にひずみゲージ１８を設置してもよい。   In the embodiment described above, a water leak (liquid leak) or forgetting to insert the seal member 17 is detected by comparing the stress obtained from the signal of the strain gauge 18 with a threshold value. You may compare the distortion calculated | required from 18 signals with a threshold value. Moreover, in this embodiment, although the strain gauge 18 is installed in the nut 14 side, in this invention, you may install the strain gauge 18 in the connection screw part 15 side.

１ 貯湯タンク
２ 水熱交換器
３ ヒートポンプ熱源機
４ 水冷媒熱交換器
５ 循環ポンプ
６ 電磁三方弁
７ 温水暖房器具
１０ 給水配管
１１ 出湯配管
１２，１３，１６，２２，２３，２４ 配管
１４ ナット
１５ 接続ねじ部
１６ａ フランジ
１７ シール部材
１８ ひずみゲージ
１９ 検知部 DESCRIPTION OF SYMBOLS 1 Hot water storage tank 2 Water heat exchanger 3 Heat pump heat source machine 4 Water refrigerant heat exchanger 5 Circulation pump 6 Electromagnetic three-way valve 7 Hot water heater 10 Water supply piping 11 Hot water supply piping 12, 13, 16, 22, 23, 24 Piping 14 Nut 15 Connection thread part 16a Flange 17 Seal member 18 Strain gauge 19 Detection part

Claims (3)

液体を加熱する加熱手段と、
雄ねじが形成された接続ねじ部と、前記雄ねじに螺合する雌ねじが形成されたナットと、前記液体が通る配管と前記接続ねじ部との間に介挿され、前記ナットを締め付けることにより前記配管と前記接続ねじ部との間で圧縮される、弾性材料で構成されたシール部材とを有し、前記配管を接続するねじ式の配管接続部と、
前記配管接続部に設置され、前記配管接続部のひずみを検出するひずみゲージと、
前記ひずみゲージの信号に基づく検出値と、所定の閾値とを比較することにより、前記シール部材の経年劣化による前記配管接続部からの液漏れを検知する液漏れ検知手段と、
を備え、
前記液漏れ検知手段は、前記検出値が前記閾値に比べて低くなった場合には、前記配管接続部の液漏れ、または液漏れのおそれ、があると判定する熱供給システム。 Heating means for heating the liquid;
A connecting screw part formed with a male screw, a nut formed with a female screw threadedly engaged with the male screw, a pipe through which the liquid passes and the connecting screw part, and the pipe by tightening the nut And a sealing member made of an elastic material that is compressed between the connecting screw part and a screw-type pipe connecting part that connects the pipes,
A strain gauge that is installed in the pipe connection part and detects strain of the pipe connection part;
A detection value based on the signal of the strain gauge, by comparing a predetermined threshold value, the liquid leakage detection means for detecting liquid leakage from the piping connection portions due to aging deterioration of the sealing member,
With
When the detected value is lower than the threshold value, the liquid leakage detection unit determines that there is a risk of liquid leakage or leakage of the pipe connection part. 前記ナットを締め付けた後の前記ひずみゲージの検出値の変化特性に基づいて、前記シール部材の入れ忘れを検知する入れ忘れ検知手段を備える請求項１記載の熱供給システム。 The strain on the basis of the change characteristics of the detected value of the gauge, heat supply system according to claim 1, further comprising a forgotten detecting means for detecting a forgotten of the seal member after tightening the nut. 給湯と暖房との一方または両方を行う請求項１または請求項２に記載の熱供給システム。 The heat supply system according to claim 1 or 2, wherein one or both of hot water supply and heating is performed.
JP2011273551A 2011-12-14 2011-12-14 Heat supply system Expired - Fee Related JP5737164B2 (en)

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JP3588660B2 (en) * 1993-06-04 2004-11-17 忠弘 大見 Tightening device
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