JP3404969B2 - Method for judging abnormality of heat exchanger in circulation chiller - Google Patents
Method for judging abnormality of heat exchanger in circulation chillerInfo
- Publication number
- JP3404969B2 JP3404969B2 JP06172195A JP6172195A JP3404969B2 JP 3404969 B2 JP3404969 B2 JP 3404969B2 JP 06172195 A JP06172195 A JP 06172195A JP 6172195 A JP6172195 A JP 6172195A JP 3404969 B2 JP3404969 B2 JP 3404969B2
- Authority
- JP
- Japan
- Prior art keywords
- heat exchanger
- cold water
- pressure
- circulation
- water supply
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Devices That Are Associated With Refrigeration Equipment (AREA)
- Other Air-Conditioning Systems (AREA)
Description
【発明の詳細な説明】
【０００１】
【産業上の利用分野】この発明は、たとえば食品冷却装
置等へ冷水を供給する循環型チラーにおける熱交換器の
異常判定方法に関するものである。
【０００２】
【従来の技術】従来、循環型チラーを用いて、たとえば
食品等の被冷却物を冷却する装置として図２に示すもの
がある。前記循環型チラーは、図２に示すように、蓄熱
槽２１と熱交換器２２との間を冷水循環路２３で接続す
るとともに、前記熱交換器２２と冷凍機２４との間を冷
媒循環路２５で接続した構成となっている。そして、前
記蓄熱槽２１内の冷水を用いて食品等を冷却する冷水タ
ンク２６を設け、この冷水タンク２６と前記蓄熱槽２１
との間を給水ポンプ２７を備えた冷水供給ライン２８で
接続するとともに、前記冷水タンク２６の下部と前記冷
水循環路２３との間を循環ポンプ３０を備えた冷水還流
路２９で接続している。
【０００３】ところで、前記冷水タンク２６内では、食
品等の被冷却物を冷却するため、若干の汚物が冷水へ混
入し、汚水となって前記冷水還流路２９を介して前記熱
交換器２２へ流入し、その伝熱面に汚れが付着すること
がある。この伝熱面に汚れが付着すると、冷水の循環水
量が低下し、前記熱交換器２２がつまり状態となる。ま
た、前記熱交換器２２の別のつまり状態としては、前記
冷水循環路２３からの循環冷水が、冷却されすぎて前記
熱交換器２２内で凍結し、循環水量が低下することがあ
る。
【０００４】
【発明が解決しようとする課題】前記のように、熱交換
器のつまりの原因は、伝熱面への汚れの付着によるもの
と、熱交換器内での凍結によるものとがあるが、それぞ
れのつまり（異常）を解消するためには、その原因を判
別する必要がある。そこで、この発明は、前記課題に鑑
み、循環型チラーにおける熱交換器の異常判定方法を提
供することを目的とするものである。
【０００５】
【課題を解決するための手段】この発明は、前記課題を
解決するためになされたものであって、冷凍機，熱交換
器および蓄熱槽を備え、前記冷凍機と前記熱交換器とを
冷媒供給路および冷媒循環路で接続し、前記熱交換器と
前記蓄熱槽とを冷水供給路および冷却水還流路で接続
し、前記蓄熱槽内の冷水を用いて食品等の被冷却物を冷
却する冷水タンクを備え、前記蓄熱槽と前記冷水タンク
とを冷水供給ラインで接続し、前記冷水タンクと前記冷
水供給路とを冷水循環ラインで接続した循環型チラーに
おいて、前記冷水供給路における循環ポンプの吐出側に
設けた圧力スイッチが所定圧力を検出したとき、凍結解
除機構を作動させ、所定時間経過後、前記圧力スイッチ
の検出圧力が通常圧力へ復帰しないとき、前記熱交換器
の凍結以外のつまりと判定することを特徴としている。
【０００６】
【作用】圧力スイッチが所定圧力を検出したとき、凍結
解除機構を作動させ、所定時間経過後、前記圧力スイッ
チの検出圧力が通常圧力へ復帰しないとき、前記熱交換
器の凍結以外のつまりと判定する。
【０００７】
【実施例】以下、この発明の具体的実施例を図面に基づ
いて詳細に説明する。図１は、この発明における循環型
チラーの概略説明図で、この循環型チラーは、冷凍機
１，熱交換器２および蓄熱槽３を備えている。前記循環
型チラーは、たとえば液化した冷媒（たとえば、フロ
ン）を膨張弁１ａで減圧した後、前記熱交換器２へ供給
し、前記熱交換器２において被冷却水を冷媒の蒸発潜熱
によって直接冷却する方法を利用したものである。
【０００８】前記熱交換器２は、図１に示すように、外
管２ａを螺旋状（実施に応じては、直線状でも可能）に
形成し、その内部に内管２ｂを挿入した二重管構造であ
って、前記外管２ａと前記内管２ｂとの間に前記蓄熱槽
３から供給される被冷却水が流通し、前記内管２ｂ内に
は、前記冷凍機１から供給される冷媒が流通する。した
がって、被冷却水を前記内管２ｂの外周から冷却して冷
却水を生成する構造となっている。
【０００９】前記冷凍機１と前記熱交換器２における前
記内管２ｂとは、前記膨張弁１ａを設けた冷媒供給路４
と冷媒還流路５とで接続し、冷媒を循環させる。一方、
前記蓄熱槽３の下部と前記熱交換器２における前記外管
２ａの入口とは、冷水供給路６によって接続されてお
り、また前記熱交換器２における前記外管２ａの出口と
前記蓄熱槽３とは、冷却水還流路７を介して接続されて
おり、前記冷水供給路６に循環ポンプ８を設け、この循
環ポンプ８の吐出側に圧力スイッチ９を設けている。そ
して、前記循環ポンプ８の上流側の前記冷水供給路６
に、凍結解除機構としての補給水路１０（たとえば、水
道水が供給される。）が接続してあり、この補給水路１
０の途中に電磁弁１１が設けられている。
【００１０】前記蓄熱槽３内の冷水を用いて、たとえば
食品等を冷却する冷水タンク１２を設け、この冷水タン
ク１２と前記蓄熱槽３とを冷水供給ライン１３で接続
し、この冷水供給ライン１３の途中に給水ポンプ１４を
設けている。そして、前記冷水タンク１２の下部と前記
冷水供給路６の所定箇所とを冷水還流ライン１５で接続
し、この冷水還流ライン１５の途中に逆止弁１６を設け
ている。また、前記冷水タンク１２には、温度センサ１
７およびオーバーフローライン１８を設けている。そし
て、前記冷凍機１，前記循環ポンプ８，前記圧力スイッ
チ９，前記電磁弁１１，前記給水ポンプ１４および前記
温度センサ１７は、制御器（図示省略）にそれぞれ回線
（図示省略）を介して接続している。
【００１１】つぎに、前記熱交換器２の異常判定方法を
説明する。まず、前記補給水路１０における前記電磁弁
１１を開き、前記循環ポンプ８を駆動するとともに、前
記冷凍機１を運転し、前記蓄熱槽３の所定水位まで冷水
を貯水した後、前記冷水供給ライン１３における前記給
水ポンプ１４を駆動し、前記冷水タンク１２の所定水位
まで所定温度（たとえば、１℃）の冷水を貯水後、前記
補給水路１０における前記電磁弁１１を閉じる。そし
て、たとえば食品等の被冷却物を前記冷水タンク１２内
で冷却する。前記冷水タンク１２内に設けた前記温度セ
ンサ１７は、冷水温度を検出し、前記制御器（図示省
略）へ通報する。前記制御器は、前記温度センサ１７か
らの信号に基づき前記冷凍機１の運転を制御する。
【００１２】ところで、前記循環ポンプ８の吐出側に設
けた前記圧力スイッチ９は、前記熱交換器２内の循環水
量の低下，すなわちつまり現象が発生し、所定圧力，た
とえば２．０kg/cm2 になったことを検出すると、信号を
前記制御器へ送る。前記制御器は、凍結解除機構として
の前記補給水路１０における前記電磁弁１１を開き、常
温水（水道水）を前記冷水供給路６を介して前記熱交換
器２へ供給する。そして、所定時間経過後、前記圧力ス
イッチ９の検出圧力が通常圧力（たとえば、１．５kg/c
m 2 ）へ復帰すれば、前記熱交換器２内での凍結によるつ
まりであったと判定し、前記電磁弁１１を閉じる。ま
た、所定時間経過後も前記圧力スイッチ９の検出圧力が
所定圧力の状態のときは、凍結以外のつまり，すなわち
前記熱交換器２の伝熱面に汚れが付着し、つまり現象が
起り始めたと判定する。したがって、所定時間経過後に
前記圧力スイッチ９の検出圧力が通常圧力へ復帰すれ
ば、前記熱交換器２内での凍結を自動的に解除したこと
になり、また通常圧力へ復帰しないときは、前記熱交換
器２内につまり現象が起り始めたと判定し、警報等を発
してメンテナンスの必要性を通報する。
【００１３】
【発明の効果】この発明によれば、熱交換器内の凍結に
より圧力スイッチが所定圧力を検出した場合は、凍結解
除機構の作動により自動的に凍結を解除し、循環型チラ
ーを正常に連続運転させることができる。また、前記圧
力スイッチの検出圧力が通常圧力へ復帰しないときは、
凍結以外のつまりと判定し、警報等を発してメンテナン
スの必要性を通報するので、循環型チラーにおける自己
診断上の効果は大きい。BACKGROUND OF THE INVENTION [0001] FIELD OF THE INVENTION This invention relates to the abnormality determination method of the heat exchanger in the circulating chiller for supplying cold water to the food cooling devices, etc. For example. [0004] Conventionally, with a recycling chiller, even field
There is shown in FIG. 2 as a device for cooling the object to be cooled food Hinto. As shown in FIG. 2, the circulation chiller connects a heat storage tank 21 and a heat exchanger 22 with a chilled water circulation path 23, and connects the heat exchanger 22 and the refrigerator 24 with each other. The components are connected by a refrigerant circuit 25. Further, a cold water tank 26 for cooling foods and the like using cold water in the heat storage tank 21 is provided, and the cold water tank 26 and the heat storage tank 21 are cooled.
With connecting with cold water supply line 28 provided with a water feed pump 27 between, are connected with a cold water return pipe 29 having a circulating pump 30 between the lower and the cold water circulation passage 23 of the cold water tank 26 . [0003] Within the cold water tank 26, to cool the object to be cooled such as food, some dirt mixed <br/> enter City cold water, through the chilled water return passage 29 becomes sewage The heat may flow into the heat exchanger 22 , and the heat transfer surface may be contaminated. This dirty heat transfer surface is adhered, and reduced cold water circulating water, the heat exchanger 22 that is a state. Further, as another state of the heat exchanger 22, the circulating cold water from the chilled water circulation passage 23 may be excessively cooled and frozen in the heat exchanger 22, and the circulating water amount may decrease. [0004] As described above , the cause of clogging of the heat exchanger is caused by adhesion of dirt to the heat transfer surface and by freezing in the heat exchanger. However, in order to eliminate each blockage (abnormality) , it is necessary to determine the cause. In view of the above problem , an object of the present invention is to provide a method for determining an abnormality of a heat exchanger in a circulation chiller. SUMMARY OF THE INVENTION [0005] The present invention has been made to solve the above-mentioned problems, and is directed to a refrigerator, a heat exchanger,
And a heat storage tank, wherein the refrigerator and the heat exchanger
Connected by a refrigerant supply path and a refrigerant circulation path, and with the heat exchanger
Connected to the heat storage tank via a cold water supply path and a cooling water return path
The object to be cooled, such as food, is cooled using the cold water in the heat storage tank.
A heat storage tank and the cold water tank.
And a cold water supply line to connect the cold water tank and the cold water
A circulation chiller that connects the water supply path with a chilled water circulation line
At the discharge side of the circulation pump in the cold water supply path.
When the provided pressure switch detects a predetermined pressure , the freeze release mechanism is actuated.
When the detected pressure does not return to the normal pressure, it is determined that the heat exchanger is other than frozen. [0006] [action] When the pressure switch detects the predetermined pressure, by operating the freeze release mechanism, after a predetermined time, when the detected pressure of the pressure switch does not return to the normal pressure, except freezing of the heat exchanger Is determined. Hereinafter, a specific embodiment of the present invention will be described in detail with reference to the drawings. Figure 1 is a schematic illustration of a recycling chiller definitive to the present invention, the circulating chiller has a refrigerator 1, the heat exchanger 2 and the heat storage tank 3. The circulation
The mold chiller supplies , for example, the liquefied refrigerant (for example , Freon) to the heat exchanger 2 after reducing the pressure with the expansion valve 1a.
Then, in the heat exchanger 2 , a method of directly cooling water to be cooled by latent heat of vaporization of a refrigerant is used. [0008] The heat exchanger 2, as shown in FIG. 1, (in response to the implementation, also straight) outer tube 2a spirally formed on the double insertion of the inner tube 2b therein a tubular structure, wherein the cooling water supplied from the heat storage tank 3 is circulated, in the said inner tube 2b, is supplied from the refrigerating machine 1 between the inner tube 2b and the outer tube 2a The refrigerant circulates. Thus, it has a structure for generating the cooling water by cooling the cooled water from the outer periphery of the inner tube 2b. [0009] Before in the refrigerator 1 and the heat exchanger 2
The serial inner tube 2b, the refrigerant supply path 4 provided with the expansion valve 1a
And connected by a refrigerant return passage 5, the refrigerant is circulated. on the other hand,
The lower portion of the thermal storage tank 3 and the inlet of the outer tube 2a in the heat exchanger 2, it is connected by a cold water supply passage 6
Ri, also the outlet of the outer tube 2a in the heat exchanger 2
The heat storage tank 3 is connected via a cooling water recirculation path 7, a circulation pump 8 is provided in the cooling water supply path 6, and a pressure switch 9 is provided on a discharge side of the circulation pump 8. Then, the cold water supply path 6 on the upstream side of the circulation pump 8
The replenishment waterway 10 as freeze release mechanism (e.g., tap water is supplied.) Is Yes connected, the supply water path 1
The solenoid valve 11 is provided in the middle of 0 . [0010] with cold water of the storage tank 3, for example, cold water tank 12 to cool the food or the like is provided, and connecting the storage tank 3 and the chilled water tank 12 with cold water supply line 13, the cold water supply line 13 the way to the water supply pump 14
Provided . Then, the bottom of the cold water container 12 and a predetermined portion of said cold water supply passage 6 is connected with a cold water return line 15, the check valve 16 is provided <br/> in the middle of the cold water return line 15. The cold water tank 12 has a temperature sensor 1
7 and an overflow line 18 are provided . The refrigerator 1 , the circulation pump 8 , the pressure switch 9 , the solenoid valve 11 , the water supply pump 14, and the temperature sensor 17 are each connected to a controller (not shown) by a line (not shown). Connected through. [0011] Next, a method of determining a failure of the heat exchanger 2. First, open the solenoid valve 11 in the supply water path 10, to drive the circulating pump 8, before
Driving a serial refrigerator 1, after water cold water to a predetermined water level in the storage tank 3, and drives the feed <br/> water pump 14 in the cold water supply line 13, a predetermined up to a predetermined water level in the cold water tank 12 After storing cold water at a temperature (for example , 1 ° C.), the solenoid valve 11 in the makeup water passage 10 is closed. Then, an object to be cooled such as a food is cooled in the cold water tank 12. Wherein the temperature sensor 17 provided in the cold water tank 12 detects the temperature of chilled water, to report to the controller (not shown). The controller controls the operation of the refrigerator 1 based on a signal from the temperature sensor 17. By the way, the pressure switch 9 provided on the discharge side of the circulation pump 8, a reduction in the circulating water in the heat exchanger 2, i.e. in other words phenomenon occurs, a predetermined pressure, for example 2.0 kg / cm 2 When it is detected that became, the signal
Send to the controller . The controller opens the electromagnetic valve 11 in the makeup water channel 10 as a freeze release mechanism, and supplies room temperature water (tap water) to the heat exchanger 2 through the cold water supply channel 6. After a lapse of a predetermined time, the pressure detected by the pressure switch 9 becomes the normal pressure (for example, 1.5 kg / c).
If it returns to m 2 ), it is determined that the blockage was caused by freezing in the heat exchanger 2 and the solenoid valve 11 is closed. When the detected pressure of the pressure switch 9 remains at the predetermined pressure even after the lapse of the predetermined time, it is assumed that a phenomenon other than freezing, that is , dirt adheres to the heat transfer surface of the heat exchanger 2, that is, a phenomenon starts to occur. judge. Therefore, if the return pressure detected by the pressure switch 9 after the elapse of Jo Tokoro time to the normal pressure, results in that automatically releases the freezing of within the heat exchanger 2, also when no return to the normal pressure, It is determined that a phenomenon has started to occur in the heat exchanger 2, and an alarm or the like is issued to notify the necessity of maintenance. [0013] [Effect of the Invention] According to the present invention, when the Ri圧 force switch by <br/> the freezing of the heat exchanger detects a predetermined pressure, automatically frozen by the operation of the freezing release mechanism And the circulation type chiller can be normally operated continuously. When the pressure detected by the pressure switch does not return to the normal pressure ,
The self-diagnosis effect of the circulation chiller is large because it is determined that it is other than freezing, and an alarm or the like is issued to notify the necessity of maintenance.
【図面の簡単な説明】
【図１】この発明の一実施例を示す循環型チラーの概略
説明図である。
【図２】従来の循環型チラーの概略説明図である。
【符号の説明】
１ 冷凍機
２ 熱交換器
３ 蓄熱槽４ 冷媒供給路 ５ 冷媒循環路 ６ 冷水供給路 ７ 冷却水還流路
８ 循環ポンプ
９ 圧力スイッチ１２ 冷水タンク １３ 冷水供給ライン １５ 冷水循環ライン BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic explanatory view of a circulation chiller showing one embodiment of the present invention. FIG. 2 is a schematic explanatory view of a conventional circulation chiller. [Description of Signs] 1 refrigerator 2 heat exchanger 3 heat storage tank 4 refrigerant supply path 5 refrigerant circulation path 6 chilled water supply path 7 cooling water recirculation path 8 circulation pump 9 pressure switch 12 chilled water tank 13 chilled water supply line 15 chilled water circulation line
フロントページの続き (56)参考文献 特開 平６−300398（ＪＰ，Ａ) 特開 平６−323701（ＪＰ，Ａ) 特開 平１−266458（ＪＰ，Ａ) 特開 平６−257907（ＪＰ，Ａ) 特開 昭60−149857（ＪＰ，Ａ) 特開 昭55−152365（ＪＰ，Ａ) 実開 平２−62349（ＪＰ，Ｕ) 実開 昭57−50670（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.7，ＤＢ名) F25B 49/02 570 F24F 5/00 102 F25D 13/00 F28F 27/00 511 Continuation of front page (56) References JP-A-6-300398 (JP, A) JP-A-6-323701 (JP, A) JP-A-1-266458 (JP, A) JP-A-6-257907 (JP) JP-A-60-149857 (JP, A) JP-A-55-152365 (JP, A) JP-A-2-62349 (JP, U) JP-A-57-50670 (JP, U) (58) Field surveyed (Int.Cl. 7 , DB name) F25B 49/02 570 F24F 5/00 102 F25D 13/00 F28F 27/00 511
Claims (1)
備え、前記冷凍機１と前記熱交換器２とを冷媒供給路４
および冷媒循環路５で接続し、前記熱交換器２と前記蓄
熱槽３とを冷水供給路６および冷却水還流路７で接続
し、前記蓄熱槽３内の冷水を用いて食品等の被冷却物を
冷却する冷水タンク１２を備え、前記蓄熱槽３と前記冷
水タンク１２とを冷水供給ライン１３で接続し、前記冷
水タンク１２と前記冷水供給路６とを冷水循環ライン１
５で接続した循環型チラーにおいて、前記冷水供給路６
における循環ポンプ８の吐出側に設けた圧力スイッチ９
が所定圧力を検出したとき、凍結解除機構を作動させ、
所定時間経過後、前記圧力スイッチ９の検出圧力が通常
圧力へ復帰しないとき、前記熱交換器２の凍結以外のつ
まりと判定することを特徴とする循環型チラーにおける
熱交換器の異常判定方法。(57) [Claims 1] A refrigerator 1, a heat exchanger 2, and a heat storage tank 3
And a refrigerant supply path 4 for connecting the refrigerator 1 and the heat exchanger 2 to each other.
And the refrigerant circuit 5 to connect the heat exchanger 2 and the storage
Connected to heat tank 3 by cold water supply path 6 and cooling water return path 7
Then, the object to be cooled such as food is
A cooling water tank 12 for cooling is provided.
The water tank 12 is connected to a cold water supply line 13 and
The cold water circulation line 1 is connected to the water tank 12 and the cold water supply path 6.
5. In the circulation type chiller connected at 5, the cold water supply path 6
Pressure switch 9 provided on the discharge side of circulation pump 8
Activates the freeze release mechanism when detects the predetermined pressure ,
After a lapse of a predetermined time, the pressure detected by the pressure switch 9 becomes normal.
When the pressure does not return to the pressure, a method other than freezing of the heat exchanger 2 is determined.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP06172195A JP3404969B2 (en) | 1995-02-23 | 1995-02-23 | Method for judging abnormality of heat exchanger in circulation chiller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP06172195A JP3404969B2 (en) | 1995-02-23 | 1995-02-23 | Method for judging abnormality of heat exchanger in circulation chiller |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08233417A JPH08233417A (en) | 1996-09-13 |
| JP3404969B2 true JP3404969B2 (en) | 2003-05-12 |
Family
ID=13179379
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP06172195A Expired - Fee Related JP3404969B2 (en) | 1995-02-23 | 1995-02-23 | Method for judging abnormality of heat exchanger in circulation chiller |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3404969B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101944754B1 (en) * | 2018-09-06 | 2019-02-01 | 주식회사 에이알 | Cooling water circulation system having structure for preventing cooling water from leaking and air conditioner and server rack cooling system including the same |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4841583B2 (en) * | 2008-03-26 | 2011-12-21 | 水道機工株式会社 | Liquid cooling system |
| JP6087717B2 (en) * | 2013-05-01 | 2017-03-01 | 菱熱工業株式会社 | Cold water production equipment |
-
1995
- 1995-02-23 JP JP06172195A patent/JP3404969B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101944754B1 (en) * | 2018-09-06 | 2019-02-01 | 주식회사 에이알 | Cooling water circulation system having structure for preventing cooling water from leaking and air conditioner and server rack cooling system including the same |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH08233417A (en) | 1996-09-13 |
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