JP2013137141A - Method for detecting leakage of refrigerating machine oil - Google Patents

Method for detecting leakage of refrigerating machine oil Download PDF

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JP2013137141A
JP2013137141A JP2011287758A JP2011287758A JP2013137141A JP 2013137141 A JP2013137141 A JP 2013137141A JP 2011287758 A JP2011287758 A JP 2011287758A JP 2011287758 A JP2011287758 A JP 2011287758A JP 2013137141 A JP2013137141 A JP 2013137141A
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water
refrigerant
temperature
heat exchanger
machine oil
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Katsutoshi Matsunaga
勝利 松永
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Miura Co Ltd
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Miura Co Ltd
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Abstract

PROBLEM TO BE SOLVED: To provide a method for detecting leakage of refrigerating machine oil not affected by the refrigerant machine oil included in a refrigerant by informing abnormal conditions by detecting the leakage of the refrigerant to a water side caused by the freezing breakage of a heat exchanger as soon as possible.SOLUTION: A refrigerant is passed through a heat exchanger 2, heat is exchanged between water and the refrigerant, and a temperature of the water is lowered or raised in the method for detecting the leakage of the refrigerant machine oil, the temperature of a water outlet side of the heat exchanger 2 is continuously detected, the leakage of the refrigerant machine oil is determined when the temperature of the water changes in a predetermined width or more in a predetermined time.

Description

本発明は、熱交換器に冷媒を通し、水と冷媒を熱交換して水の温度を下げる、または上昇させる装置の冷凍機油漏れ検出方法に関する。   The present invention relates to a refrigerator oil leak detection method for an apparatus that lowers or raises the temperature of water by passing refrigerant through a heat exchanger and exchanging heat between water and the refrigerant.

冷凍機から０℃以下の冷媒を熱交換器に供給し、水と熱交換して１℃〜３℃の冷水を供給する冷水装置において、熱交換器内の水が凍結することが要因で熱交換器が破損することがある。これは、供給する水の温度が凍結温度に近いために、水の流量低下や冷媒のわずかな温度低下などの影響を受け易いこと、熱交換器内の流れの不均一性などが主な理由である。
熱交換器が破損し、冷媒が水側に漏出した場合、冷媒中に存在する冷凍機油も同時に流出する。冷媒は水の熱によって蒸発するが、冷凍機油は水中に残るため、供給される冷水が食品の冷却などに使用されている場合には、冷凍機油が食品に接触してしまい、汚染を引き起こすおそれがある。このため、熱交換器内の凍結を防止するといったことや、冷媒の漏れがあった場合、これをできる限り早く検出するといった手段を講じる必要がある。
熱交換器内の凍結を防止する方法として、熱交換器の出入口の冷水温度を検出し、冷水入口温度が上昇していない状態で、かつその冷水出口温度が下降状態から上昇に転じたとき、冷凍機を停止するようにする方法がある（例えば、特許文献１参照。）。
しかしながら、この方法では、熱交換器内の水が凍結温度に近づくたびに冷凍機が停止してしまい、冷水の安定供給が行えないという問題があり、現実的ではない。 In a chilled water device that supplies a refrigerant of 0 ° C. or lower from a refrigerator to a heat exchanger, and exchanges heat with water to supply cold water of 1 ° C. to 3 ° C., heat is generated due to freezing of water in the heat exchanger. The exchanger may be damaged. This is mainly due to the fact that the temperature of the supplied water is close to the freezing temperature, which is easily affected by a decrease in the flow rate of the water and a slight decrease in the temperature of the refrigerant, and non-uniform flow in the heat exchanger. It is.
When the heat exchanger is damaged and the refrigerant leaks to the water side, the refrigerating machine oil present in the refrigerant also flows out at the same time. The refrigerant evaporates due to the heat of the water, but the refrigerating machine oil remains in the water, so if the supplied cold water is used for cooling food, etc., the refrigerating machine oil may come into contact with the food and cause contamination. There is. For this reason, it is necessary to take measures such as preventing freezing in the heat exchanger and detecting as soon as possible if there is a refrigerant leak.
As a method of preventing freezing in the heat exchanger, the temperature of the cold water at the inlet / outlet of the heat exchanger is detected, and when the temperature of the cold water inlet has not risen and the temperature of the cold water outlet has changed from a lowered state to an elevated temperature, There is a method for stopping the refrigerator (see, for example, Patent Document 1).
However, this method is not practical because the refrigerator stops every time the water in the heat exchanger approaches the freezing temperature, and the stable supply of cold water cannot be performed.

しかし、このような制御をしない限り、熱交換器内の水は凍結を繰り返すことになり、熱交換器の破損する危険性が高まる。したがって、冷媒漏れに対する安全性を高めるには、これをできる限り早く検出し対処する必要がある。
冷媒の漏れがあった場合、これを検出する方法として、特許文献２には、冷凍装置の冷媒漏洩検出方法として、外気温度Ｔ０と蒸発器の冷水入口温度Ｔ１と冷水出口温度Ｔ２を検出する温度センサを設けておき、冷水出口温度Ｔ２と蒸発器圧力Ｐ１から算出される蒸発温度ＴＲとの温度差（ΔＴ＝Ｔ２−ＴＲ）が運転用所定値よりも大きい状態が所定時間以上継続したら冷媒漏れと判定する方法が記載されている。 However, unless such control is performed, the water in the heat exchanger will freeze repeatedly, increasing the risk of breakage of the heat exchanger. Therefore, in order to increase the safety against refrigerant leakage, it is necessary to detect and deal with it as soon as possible.
As a method for detecting a refrigerant leak, Patent Document 2 discloses a temperature for detecting an outside air temperature T0, an evaporator cold water inlet temperature T1, and a cold water outlet temperature T2 as a refrigerant leak detection method for a refrigeration apparatus. If a sensor is provided and the temperature difference (ΔT = T2−TR) between the chilled water outlet temperature T2 and the evaporation temperature TR calculated from the evaporator pressure P1 is greater than the predetermined value for operation, the refrigerant leaks. Is described.

特開平４−１３１６６９号公報Japanese Patent Laid-Open No. 4-131669 特開２０１０−２１００９８号公報JP 2010-210098 A

しかし、特許文献２に記載の冷媒漏洩検出方法は、保有する冷媒が相当量漏れなければ圧力の変化が起こらないため、冷媒の漏れがあっても直ぐには検出できず、冷媒の漏れ出た冷水がそのまま使用されてしまう恐れがあるといった問題がある。   However, the refrigerant leak detection method described in Patent Document 2 does not cause a change in pressure unless a considerable amount of refrigerant leaks, so that even if there is a refrigerant leak, it cannot be detected immediately, and the cold water from which the refrigerant leaks is detected. There is a problem that there is a risk of being used as it is.

本発明の目的は、熱交換器の凍結破損によって生じる冷媒の水側への漏れをできる限り早く検出し、異常を知らせることで、冷媒に含まれる冷凍機油によって影響を受けないようにする冷凍機油漏れ検出方法を提供することにある。   The object of the present invention is to detect the refrigerant leakage to the water side caused by the freezing breakage of the heat exchanger as early as possible and to notify the abnormality so that the refrigerant oil is not affected by the refrigerant oil contained in the refrigerant. It is to provide a leak detection method.

上記の目的を達成するために、請求項１に記載の発明は、熱交換器に冷媒を通し、水と冷媒を熱交換して水の温度を下げる、または上昇させる装置の冷凍機油漏れ検出方法であって、前記熱交換器の水出口側の温度を継続して検出し、所定時間内に規定の幅以上に水の温度が変化したとき、冷凍機油の漏れと判定することを特徴とする。   In order to achieve the above object, the invention according to claim 1 is directed to a method for detecting a refrigeration machine oil leak in a device that lowers or raises the temperature of water by passing a refrigerant through a heat exchanger and exchanging heat between the water and the refrigerant. The temperature of the water outlet side of the heat exchanger is continuously detected, and when the temperature of the water changes by a predetermined width or more within a predetermined time, it is determined that the refrigerating machine oil has leaked. .

請求項１に記載の発明によれば、熱交換器から水側へ冷媒の漏れがあったとき、水の温度が短時間で急激に変化するので、前記熱交換器の水出口側の温度を継続して検出しておき、所定時間内に規定の幅以上に水の温度が変化したとき、冷凍機油の漏れと判定することにより、短時間のうちに冷凍機油漏れを検出することができる。   According to the first aspect of the present invention, when the refrigerant leaks from the heat exchanger to the water side, the temperature of the water changes rapidly in a short time. If the temperature of the water is continuously detected and the temperature of the water changes more than a predetermined width within a predetermined time, it is possible to detect the refrigerating machine oil leakage in a short time by determining that the refrigerating machine oil has leaked.

請求項２に記載の発明は、熱交換器に冷媒を通し、水と冷媒を熱交換して水の温度を下げる、または上昇させる装置の冷凍機油漏れ検出方法であって、前記冷媒に含まれる冷凍機油に蛍光物質を混合しておき、前記熱交換器の水出口側の水系の任意の箇所に水中で紫外線を照射する紫外線発光素子と水中で特定の波長を検出する受光素子とで構成される蛍光物質検出センサを設け、受光素子が紫外線の波長と異なった波長を検出したとき、冷凍機油の漏れと判定することを特徴とする。   The invention according to claim 2 is a refrigeration oil leak detection method for a device that lowers or raises the temperature of water by passing a refrigerant through a heat exchanger and exchanging heat between the water and the refrigerant, and is included in the refrigerant It is composed of an ultraviolet light emitting element that irradiates ultraviolet rays in water to an arbitrary portion of the water system on the water outlet side of the heat exchanger and a light receiving element that detects a specific wavelength in water. A fluorescent substance detection sensor is provided, and when the light receiving element detects a wavelength different from the wavelength of ultraviolet light, it is determined that the refrigerating machine oil has leaked.

請求項２に記載の発明によれば、熱交換器から冷媒の水側への漏れがあったとき、水中に流れ込んだ冷凍機油に混合している蛍光物質が、紫外線発光素子が照射する紫外線の波長を変化させることから、受光素子が紫外線の波長と異なった波長を検出したとき、冷凍機油の漏れを判定することにより、短時間のうちに冷凍機油漏れを検出することができる。   According to the second aspect of the present invention, when there is a leak from the heat exchanger to the water side of the refrigerant, the fluorescent material mixed in the refrigerating machine oil that has flowed into the water is the ultraviolet light emitted by the ultraviolet light emitting element. Since the wavelength is changed, when the light receiving element detects a wavelength different from the wavelength of the ultraviolet light, the leakage of the refrigerating machine oil can be detected in a short time by determining the leakage of the refrigerating machine oil.

本発明によれば、熱交換器の凍結破損によって生じる冷媒の水側への漏れを短時間で検出して冷凍機油の漏れを検出することができるので、この異常を警報として取り込むことにより早急な対処が可能となり、これにより冷媒に含まれる冷凍機油による水への影響を防止することができる。   According to the present invention, it is possible to detect the leakage of the refrigeration machine oil in a short time by detecting the leakage of the refrigerant caused by the freezing breakage of the heat exchanger in a short time. This makes it possible to prevent the influence of refrigeration oil contained in the refrigerant on water.

本発明に係る冷凍機油漏れ検出方法の実施の形態の第１例を実施する冷水装置を示す系統構成図である。It is a system configuration | structure figure which shows the cold water apparatus which implements the 1st example of embodiment of the refrigerator oil leak detection method which concerns on this invention. 本発明に係る冷凍機油漏れ検出方法の実施の形態の第２例を実施する冷水装置を示すの系統構成図である。It is a system | strain block diagram which shows the cold water apparatus which implements the 2nd example of embodiment of the refrigerator oil leak detection method which concerns on this invention. 本発明に係る冷凍機油漏れ検出方法の実施の形態の第２例を実施する冷水装置の他例を示す系統構成図である。It is a system | strain block diagram which shows the other example of the cold water apparatus which implements the 2nd example of embodiment of the refrigerator oil leak detection method which concerns on this invention. 本発明に係る冷凍機油漏れ検出方法の実施の形態の第２例を実施する冷水装置の他例を示す系統構成図である。It is a system | strain block diagram which shows the other example of the cold water apparatus which implements the 2nd example of embodiment of the refrigerator oil leak detection method which concerns on this invention.

以下、冷凍機油漏れ検出方法の実施の形態の第１例を図面を参照して詳細に説明する。
図１は本発明に係る冷凍機油漏れ検出方法の実施の形態の第１例を実施する冷水装置を示す系統構成図である。 Hereinafter, a first example of an embodiment of a refrigerator oil leakage detection method will be described in detail with reference to the drawings.
FIG. 1 is a system configuration diagram showing a chilled water apparatus that implements a first example of an embodiment of a refrigerator oil leak detection method according to the present invention.

図１に示す冷水装置１は、熱交換器２に冷凍機３から冷媒を供給する冷媒循環路４と、水を送り込む冷水循環路５が接続されている。冷媒循環路４の冷媒供給路４ａには、膨張弁６と開閉弁７が設けられている。また、冷水循環路５は、水を熱交換器２に送り込む入口側循環路５ａと熱交換器２を通って冷却された水が送り出される出口側循環路５ｂで構成され、入口側循環路５ａと出口側循環路５ｂは貯水タンク８に接続し、入口側循環路５ａに設けられた循環ポンプ９により入口側循環路５ａと出口側循環路５ｂを循環するようになっている。また、貯水タンク８には、貯水タンク８に貯留された冷水を負荷に供給する冷水取出路１０と、貯水タンク８に給水する給水路１１が接続されている。冷水取出路１０には冷水を負荷に送る送水ポンプ１２が設けられている。また、給水路１１には給水弁１３、ボールタップ１４が設けられ、貯水タンク８の水位が低下すると補給水が供給されるようになっている。   In the chilled water device 1 shown in FIG. 1, a refrigerant circulation path 4 that supplies a refrigerant from a refrigerator 3 to a heat exchanger 2 and a chilled water circulation path 5 that feeds water are connected. An expansion valve 6 and an opening / closing valve 7 are provided in the refrigerant supply path 4 a of the refrigerant circulation path 4. The cold water circulation path 5 includes an inlet-side circulation path 5a for sending water to the heat exchanger 2 and an outlet-side circulation path 5b for sending water cooled through the heat exchanger 2, and the inlet-side circulation path 5a. The outlet-side circulation path 5b is connected to the water storage tank 8, and is circulated through the inlet-side circulation path 5a and the outlet-side circulation path 5b by a circulation pump 9 provided in the inlet-side circulation path 5a. The water storage tank 8 is connected to a cold water outlet passage 10 for supplying cold water stored in the water storage tank 8 to a load, and a water supply passage 11 for supplying water to the water storage tank 8. The cold water outlet 10 is provided with a water pump 12 that sends cold water to a load. Further, the water supply passage 11 is provided with a water supply valve 13 and a ball tap 14 so that makeup water is supplied when the water level of the water storage tank 8 decreases.

本例では、熱交換器２の水出口側に接続している冷水循環路５の出口側循環路５ｂに、熱交換器２の水出口側の水の温度を検出する温度センサ１５を設けている。この温度センサ１５で水出口側の水の温度を継続して検出し、所定時間内に規定の幅以上に水の温度が変化したとき冷凍機油の漏れと判定し、警報を出させるとともに冷凍機３及び循環ポンプ９を停止させる制御部１６を備えている。   In this example, a temperature sensor 15 for detecting the temperature of water on the water outlet side of the heat exchanger 2 is provided in the outlet side circulation path 5b of the cold water circulation path 5 connected to the water outlet side of the heat exchanger 2. Yes. This temperature sensor 15 continuously detects the temperature of the water on the water outlet side, and when the temperature of the water changes more than a specified width within a predetermined time, it is determined that the refrigeration machine oil has leaked, and an alarm is issued and the refrigeration machine 3 and the control part 16 which stops the circulation pump 9 are provided.

このように構成された本例によれば、本例を実施する冷水装置１は、冷凍機３から冷媒循環路４を介して冷媒を熱交換器２へ供給する。また、貯水タンク８内に貯留した水を冷水循環路５の入口側循環路５ａから熱交換器２に送り込み、熱交換器２内で冷媒と水とを熱交換させ、冷却された水を出口側循環路５ｂから貯水タンク８へ送り出すことにより、貯水タンク８内の水を循環させて、所定温度まで冷却し、冷却した冷水を負荷に送る運転を行う。   According to this example configured as described above, the chilled water device 1 that implements this example supplies the refrigerant to the heat exchanger 2 from the refrigerator 3 via the refrigerant circuit 4. Further, the water stored in the water storage tank 8 is sent from the inlet side circulation path 5a of the cold water circulation path 5 to the heat exchanger 2, heat is exchanged between the refrigerant and water in the heat exchanger 2, and the cooled water is discharged from the outlet. By sending the water from the side circulation path 5b to the water storage tank 8, the water in the water storage tank 8 is circulated, cooled to a predetermined temperature, and the cooled cold water is sent to the load.

この運転の途中で熱交換器２が破損した場合、冷媒が循環する冷水に混入し、冷媒は蒸発して気体となり、その時の気化熱により循環する冷水は急激に温度が下がって出口側循環路５ｂに流れ出る。
冷水循環路５の出口側循環路５ｂには、熱交換器２の水出口側の水の温度を検出する温度センサ１５が設けられており、この温度センサ１５で水出口側の水の温度を継続して検出し、所定時間内に規定の幅以上に水の温度が低下したとき、制御部１６が冷凍機油の漏れと判定し、警報を出させるとともに冷凍機及び循環ポンプを停止させる。これにより冷媒に含まれる冷凍機油による水への影響を防止することができる。 If the heat exchanger 2 is broken during this operation, the refrigerant is mixed into the circulating cold water, the refrigerant evaporates into a gas, and the cold water circulating due to the heat of vaporization at that time suddenly drops in temperature, and the outlet side circulation path It flows out to 5b.
The outlet side circulation path 5b of the cold water circulation path 5 is provided with a temperature sensor 15 that detects the temperature of the water outlet side of the heat exchanger 2, and the temperature sensor 15 controls the temperature of the water outlet side water. If the temperature of the water is continuously detected and the temperature of the water drops below a specified width within a predetermined time, the control unit 16 determines that the refrigeration machine oil has leaked, issues an alarm, and stops the refrigeration machine and the circulation pump. Thereby, the influence on the water by the refrigerating machine oil contained in the refrigerant can be prevented.

冷凍機油の漏れを判定する水の温度の所定時間内に規定の幅以上に水の温度の変化における、所定時間と規定の幅とは冷凍機油の漏れを確認するのに必要な所定時間と規定の幅として設定される。
例えば、熱交換器２で水を１℃を目標に冷却している場合、循環水の流量が１０Ｌ／秒で、１ｍｍの径で熱交換器２に破損が生じた場合、計算上冷媒が２３０ｇ／秒（差圧０．２ＭＰａ）で漏れるので、気化熱を３０ｋｃａｌ／ｋｇとした場合、０．６９℃の温度低下となる計算になる。この場合、冷凍機油の漏れを判定する水の温度の所定時間を３秒間で、規定の幅以上に水の温度を０．５℃以上として、このような水の温度の変化があったとき、これを冷凍機油の漏れの警報として取り込みが可能となる。 Judgment of leakage of refrigeration oil. Predetermined time and specified width in the change of water temperature over a specified width within a specified time of water temperature is a specified time required to check for leakage of refrigeration oil. Set as the width of.
For example, when water is cooled by the heat exchanger 2 with a target of 1 ° C., if the flow rate of circulating water is 10 L / sec and the heat exchanger 2 is damaged with a diameter of 1 mm, the calculated refrigerant is 230 g. Therefore, when the heat of vaporization is 30 kcal / kg, the temperature is reduced to 0.69 ° C. In this case, when a predetermined time of the temperature of the water for judging the leakage of the refrigerating machine oil is 3 seconds, the temperature of the water is set to 0.5 ° C. or more above the specified width, and when there is such a change in the water temperature This can be taken in as a refrigeration oil leak alarm.

なお、本例では、熱交換器２に冷媒を通し、水と冷媒を熱交換して水の温度を下げる冷水装置１に実施した例を説明したが、熱交換器に冷媒を通し、水と冷媒を熱交換して水の温度を上げる温水装置に実施した場合（図示せず）も同様である。この場合、熱交換器の水出口側の水の温度を検出する温度センサで水出口側の水の温度を継続して検出し、所定時間内に規定の幅以上に水の温度が上昇したとき、制御部が冷凍機油の漏れと判定する。   In addition, although the example implemented in the chilled water apparatus 1 which passes a refrigerant | coolant through the heat exchanger 2 and heat-exchanges water and a refrigerant | coolant and reduces the temperature of water was demonstrated in this example, a refrigerant | coolant is passed through a heat exchanger, water and The same applies to a case where the present invention is implemented in a hot water device that heats the refrigerant to raise the temperature of water (not shown). In this case, when the temperature of the water outlet side is continuously detected by the temperature sensor that detects the temperature of the water outlet side of the heat exchanger, and the temperature of the water rises beyond the specified width within a predetermined time The control unit determines that the refrigerator oil has leaked.

図２は本発明に係る冷凍機油漏れ検出方法の実施の形態の第２例を実施する冷水装置を示す系統構成図である。
図２に示す本例を実施する冷水装置あって、前記第１例を実施する冷水装置と同一の構成については同一の符号を付し、第１例と異なる構成についてのみ説明する。 FIG. 2: is a system | strain block diagram which shows the cold water apparatus which implements the 2nd example of embodiment of the refrigerator oil leak detection method based on this invention.
In the chilled water device that implements the present example shown in FIG. 2, the same components as those of the chilled water device that implements the first example are denoted by the same reference numerals, and only the components different from the first example will be described.

本例を実施する図２に示す冷水装置１は、冷凍機３から冷媒循環路４を介して熱交換器２へ供給する冷媒に含まれる冷凍機油に蛍光物質が混合されている。そして、熱交換器２の水出口側の水系の任意の箇所に水中で紫外線を照射する紫外線発光素子と水中で特定の波長を検出する受光素子とで構成される蛍光物質検出センサ１７が設けられている。
さらに、蛍光物質検出センサ１７の受光素子が紫外線の波長と異なった波長を検出したとき、冷凍機油の漏れと判定し、警報を出させるとともに冷凍機３及び循環ポンプ９を停止させる制御部１８を備えている。
他の構成は、第１例と変わるところはない。 In the chilled water device 1 shown in FIG. 2 that implements this example, a fluorescent substance is mixed with refrigerating machine oil contained in refrigerant supplied from the refrigerator 3 to the heat exchanger 2 via the refrigerant circulation path 4. And the fluorescent substance detection sensor 17 comprised by the ultraviolet-ray light emitting element which irradiates an ultraviolet-ray in water and the light receiving element which detects a specific wavelength in water in the arbitrary locations of the water system by the side of the water outlet of the heat exchanger 2 is provided. ing.
Further, when the light receiving element of the fluorescent substance detection sensor 17 detects a wavelength different from the wavelength of the ultraviolet ray, it is determined that the refrigerator oil has leaked, and an alarm is issued and the controller 18 for stopping the refrigerator 3 and the circulation pump 9 is provided. I have.
Other configurations are the same as the first example.

本例では、冷水循環路５の出口側循環路５ｂに蛍光物質検出センサ１７を設けているが、前記のように熱交換器２の水出口側の水系であれば特に限定されず、図３に示すように、出口側循環路５ｂにバイパス路１９を接続し、このバイパス路１９に蛍光物質検出センサ１７を設けてもよく、また、図４に示すように、貯水タンク８に接続されている冷水取出路１０に蛍光物質検出センサ１７を設けてもよい。   In this example, the fluorescent substance detection sensor 17 is provided in the outlet side circulation path 5b of the cold water circulation path 5, but it is not particularly limited as long as it is an aqueous system on the water outlet side of the heat exchanger 2 as described above. As shown in FIG. 4, a bypass passage 19 may be connected to the outlet-side circulation passage 5b, and a fluorescent substance detection sensor 17 may be provided in the bypass passage 19, and also connected to the water storage tank 8 as shown in FIG. A fluorescent substance detection sensor 17 may be provided in the cold water outlet 10.

このように構成された本例によれば、本例を実施する冷水装置１は、冷凍機３から冷媒循環路４を介して冷媒を熱交換器２へ供給する。また、貯水タンク８内に貯留した水を冷水循環路５の入口側循環路５ａから熱交換器２に送り込み、熱交換器２内で冷媒と水とを熱交換させ、冷却された水を出口側循環路５ｂから貯水タンク８へ送り出すことにより、貯水タンク８内の水を循環させて、所定温度まで冷却し、冷却した冷水を負荷に送る運転を行う。   According to this example configured as described above, the chilled water device 1 that implements this example supplies the refrigerant to the heat exchanger 2 from the refrigerator 3 via the refrigerant circuit 4. Further, the water stored in the water storage tank 8 is sent from the inlet side circulation path 5a of the cold water circulation path 5 to the heat exchanger 2, heat is exchanged between the refrigerant and water in the heat exchanger 2, and the cooled water is discharged from the outlet. By sending the water from the side circulation path 5b to the water storage tank 8, the water in the water storage tank 8 is circulated, cooled to a predetermined temperature, and the cooled cold water is sent to the load.

この運転の途中で熱交換器２が破損し、冷媒とともに冷凍機油が循環する水に混入すると、冷凍機油に混合されている蛍光物質がが紫外線発光素子から照射された紫外線を反射し、受光素子が紫外線の波長と異なった波長を検出する。受光素子が紫外線の波長と異なった波長を検出したとき、制御部１８が冷凍機油の漏れと判定し、警報を出させるとともに冷凍機３、循環ポンプ９及び送水ポンプ１２を停止させる。これにより冷媒に含まれる冷凍機油による水への影響を防止することができる。   When the heat exchanger 2 is broken during the operation and mixed with the refrigerant in which the refrigerating machine oil circulates together with the refrigerant, the fluorescent material mixed in the refrigerating machine oil reflects the ultraviolet light irradiated from the ultraviolet light emitting element, and the light receiving element Detects wavelengths different from those of ultraviolet rays. When the light receiving element detects a wavelength different from the wavelength of the ultraviolet light, the control unit 18 determines that the refrigeration machine oil has leaked, issues an alarm, and stops the refrigerator 3, the circulation pump 9, and the water supply pump 12. Thereby, the influence on the water by the refrigerating machine oil contained in the refrigerant can be prevented.

なお、本例では、第１例と同様に、熱交換器２に冷媒を通し、水と冷媒を熱交換して水の温度を下げる冷水装置１に実施した例を説明したが、熱交換器に冷媒を通し、水と冷媒を熱交換して水の温度を上げる温水装置に実施した場合（図示せず）も同様である。   In this example, as in the first example, the example in which the coolant is passed through the heat exchanger 2 and the temperature of the water is lowered by exchanging heat between the water and the refrigerant to reduce the temperature of the water has been described. The same applies to a case where the present invention is implemented in a hot water device that raises the temperature of the water by passing the refrigerant through the heat exchange of water and the refrigerant (not shown).

１ 冷水装置
２ 熱交換器
３ 冷凍機
４ 冷媒循環路
４ａ 冷媒供給路
５ 冷水循環路
５ａ 入口側循環路
５ｂ 出口側循環路
６ 膨張弁
７ 開閉弁
８ 貯水タンク
９ 循環ポンプ
１０ 冷水取出路
１１ 給水路
１２ 送水ポンプ
１３ 給水弁
１４ ボールタップ
１５ 温度センサ
１６ 制御部
１７ 蛍光物質検出センサ
１８ 制御部
１９ バイパス路 DESCRIPTION OF SYMBOLS 1 Chilled water apparatus 2 Heat exchanger 3 Refrigerator 4 Refrigerant circulation path 4a Refrigerant supply path 5 Chilled water circulation path 5a Inlet side circulation path 5b Outlet side circulation path 6 Expansion valve 7 On-off valve 8 Reservoir tank 9 Circulation pump 10 Cold water extraction path 11 Water supply Line 12 Water supply pump 13 Water supply valve 14 Ball tap 15 Temperature sensor 16 Control unit 17 Fluorescent substance detection sensor 18 Control unit 19 Bypass path

Claims (2)

熱交換器に冷媒を通し、水と冷媒を熱交換して水の温度を下げる、または上昇させる装置の冷凍機油漏れ検出方法であって、
前記熱交換器の水出口側の温度を継続して検出し、所定時間内に規定の幅以上に水の温度が変化したとき、冷凍機油の漏れと判定することを特徴とする冷凍機油漏れの検出方法。 A refrigerant oil leak detection method for a device for passing a refrigerant through a heat exchanger and exchanging heat between the refrigerant and water to lower or increase the temperature of the water,
The temperature of the water outlet side of the heat exchanger is continuously detected, and when the temperature of the water changes by more than a specified width within a predetermined time, it is determined that the refrigerator oil leaks. Detection method. 熱交換器に冷媒を通し、水と冷媒を熱交換して水の温度を下げる、または上昇させる装置の冷凍機油漏れ検出方法であって、
前記冷媒に含まれる冷凍機油に蛍光物質を混合しておき、前記熱交換器の水出口側の水系の任意の箇所に水中で紫外線を照射する紫外線発光素子と水中で特定の波長を検出する受光素子とで構成される蛍光物質検出センサを設け、受光素子が紫外線の波長と異なった波長を検出したとき、冷凍機油の漏れと判定することを特徴とする冷凍機油漏れの検出方法。 A refrigerant oil leak detection method for a device for passing a refrigerant through a heat exchanger and exchanging heat between the refrigerant and water to lower or increase the temperature of the water,
A fluorescent substance is mixed with the refrigerating machine oil contained in the refrigerant, and an ultraviolet light emitting element that irradiates ultraviolet rays in water to an arbitrary portion of the water system on the water outlet side of the heat exchanger and a light receiving device that detects a specific wavelength in water. A method for detecting refrigerating machine oil leakage, comprising: a fluorescent substance detection sensor comprising an element, and determining that a refrigerating machine oil has leaked when the light receiving element detects a wavelength different from the wavelength of ultraviolet light.
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