JPH0428985A - Chiller unit for all the year - Google Patents
Chiller unit for all the yearInfo
- Publication number
- JPH0428985A JPH0428985A JP13375690A JP13375690A JPH0428985A JP H0428985 A JPH0428985 A JP H0428985A JP 13375690 A JP13375690 A JP 13375690A JP 13375690 A JP13375690 A JP 13375690A JP H0428985 A JPH0428985 A JP H0428985A
- Authority
- JP
- Japan
- Prior art keywords
- water
- cool water
- cooler
- cold water
- pump
- 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.)
- Pending
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 164
- 230000006837 decompression Effects 0.000 claims 1
- 238000007599 discharging Methods 0.000 claims 1
- 230000008014 freezing Effects 0.000 abstract description 14
- 238000007710 freezing Methods 0.000 abstract description 14
- 230000020169 heat generation Effects 0.000 abstract 1
- 238000000034 method Methods 0.000 abstract 1
- 238000001514 detection method Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 238000009429 electrical wiring Methods 0.000 description 2
- 230000007257 malfunction Effects 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 238000010977 unit operation Methods 0.000 description 1
Landscapes
- Devices That Are Associated With Refrigeration Equipment (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は年間運転形チラーユニットにおける冬期の夜間
運転停止中に、水冷却器内の冷水の凍結防止装置に関す
る。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a device for preventing freezing of cold water in a water cooler during night-time operation stoppage in winter in a year-round chiller unit.
従来のチラーユニットは日立チラーユニット空冷式スク
リューサービスマニアルＰ、５７電気配線図に記載のよ
うに、チラーユニットが運転停止中で外気温度が低下し
、かつ、冷水温度が低下した時、冷水ポンプを運転し、
チラーユニットから負荷まで冷水を循環させ水冷却器内
の冷水の凍結防止を行なっていた。As described in Hitachi Chiller Unit Air-Cooled Screw Service Manual P, 57 Electrical Wiring Diagram, conventional chiller units operate the chilled water pump when the chiller unit is out of operation and the outside air temperature drops and the chilled water temperature drops. drive,
Cold water was circulated from the chiller unit to the load to prevent the cold water in the water cooler from freezing.
上記従来技術は外気温度、冷水温度が低下し水冷却器内
の冷水が凍結する恐れのあるとき、チラーユニットと負
荷間に冷水を循環させる大容量の冷水ポンプを運転する
制御となっており、ポンプ運転のための消費電力の節減
について考慮がなされておらず、チラーユニットの冷水
ポンプの運転経費が高くなる問題があった。The conventional technology described above operates a large-capacity cold water pump that circulates cold water between the chiller unit and the load when there is a risk that the cold water in the water cooler may freeze due to a drop in the outside air temperature or cold water temperature. No consideration was given to reducing power consumption for pump operation, and there was a problem in that the operating costs of the chiller unit's cold water pump increased.
本発明の目的は、大容量冷水ポンプの代わりに水冷却器
内のみを循環する小容量冷水ポンプを水冷却器冷水出口
側から吸入し、冷水入口側に吐出する様に接続し、外気
温度が低下し、かつ、冷水温度が低下して、冷水が凍結
の恐れがある一定温度以下に達した場合のみ、運転させ
ることで、水冷却器内の冷水の凍結を防止し、かつ、ポ
ンプの運転経費を節減することにある。The object of the present invention is to connect a small-capacity cold water pump that circulates only within the water cooler instead of a large-capacity cold water pump so that it sucks in from the cold water outlet side of the water cooler and discharges it to the cold water inlet side, so that the outside air temperature can be reduced. By operating the pump only when the chilled water temperature drops and reaches a certain temperature or below at which there is a risk of freezing, the pump can be operated to prevent the chilled water in the water cooler from freezing. The goal is to save money.
上記目的を達成するために、本発明は水冷却器冷水出口
側から吸入配管接続、水冷却器冷水入口側に吐出配管を
逆止弁を介して接続した小容量冷水ポンプを水冷却器冷
水出入口に設け、この小容量冷水ポンプを外気温度が低
下し、水冷却器内の冷水温度が凍結の恐れがある一定温
度以下に達した場合のみ運転し、水冷却器内の冷水の循
環による冷水凍結防止また小容量ポンプであるのでポン
プの運転経費の節減を図ったものである。In order to achieve the above object, the present invention provides a small-capacity cold water pump that connects a suction pipe from the cold water outlet side of a water cooler and a discharge pipe connected to the cold water inlet side of the water cooler via a check valve. The small-capacity cold water pump is installed in the water cooler, and is operated only when the outside air temperature drops and the temperature of the cold water in the water cooler reaches a certain temperature or below that is at risk of freezing. Furthermore, since it is a small-capacity pump, the operating cost of the pump can be reduced.
／１１容量冷水ポンプはチラーユニットが運転停止中で
外気温度が低下し水冷却器内の冷水が凍結の恐れがある
一定温度以下に達し、水冷却器内に感熱筒をさし込んだ
冷水温度検知サーモスタットが動作した時のみ運転し、
水冷却器冷水出口側より吸入された冷水は小容量冷水ポ
ンプ、逆止弁を通り水冷却器冷水入口側に吐出され水冷
却器内を循環し、再び、水冷却器出口側に戻る様に動作
する。/11 Capacity cold water pump has a chiller unit that is not operating and the outside air temperature drops and the cold water in the water cooler reaches a certain temperature that is at risk of freezing. Operates only when the detection thermostat is activated,
The cold water sucked in from the cold water outlet side of the water cooler passes through a small capacity cold water pump and a check valve, is discharged to the cold water inlet side of the water cooler, circulates within the water cooler, and returns to the water cooler outlet side again. Operate.
また、それによって水冷却器内に停滞していた冷水は水
冷却器内を循環するので水冷却器内の冷水は外気温度が
低下しても凍結を起こすことはない。Further, as a result, the cold water that has been stagnant in the water cooler is circulated within the water cooler, so the cold water in the water cooler does not freeze even if the outside air temperature drops.
チラーユニット運転中でチラーユニットと負荷間を循環
する大容量冷水ポンプが運転中は小容量冷水ポンプは運
転を停止しているし、逆止弁を設けているので、水冷却
器冷水入口側から出口側にバイパスするような誤動作を
することがない。While the chiller unit is operating and the large-capacity chilled water pump that circulates between the chiller unit and the load is in operation, the small-capacity chilled water pump is stopped, and since it is equipped with a check valve, the chilled water from the water cooler inlet side is There is no possibility of malfunctions such as bypass to the exit side.
以下、本発明の一実施例を第１図により説明する。 An embodiment of the present invention will be described below with reference to FIG.
チラーユニット運転停止中は圧縮機３が停止し、冷凍サ
イクルの冷媒の移動はない。また、大容量冷水ポンプ１
０も停止し、負荷１がら水冷却器２間の冷水の移動もな
い。夜間外気温度が低下すると水冷却器部、及び、それ
に接続されている水配管内の冷水は外気温度と共に低下
してくる。このとき水配管内では断面積が大きいため冷
水の凍結はないが、水冷却器２内の冷水は流路断面積、
すなわち、伝熱管の隙間が小さいため凍結しやすい。While the chiller unit is not operating, the compressor 3 is stopped and there is no movement of refrigerant in the refrigeration cycle. In addition, large capacity cold water pump 1
0 also stops, and there is no movement of cold water between the load 1 and the water cooler 2. When the outside air temperature decreases at night, the cold water in the water cooler section and the water pipes connected thereto decreases along with the outside air temperature. At this time, the cold water does not freeze in the water pipe because the cross-sectional area is large, but the cold water in the water cooler 2 has a flow path cross-sectional area of
In other words, the gaps between the heat exchanger tubes are small, making them susceptible to freezing.
その凍結を防止するために冷水温度検知用サーモスタッ
トの感熱筒を水冷却器２の冷水出口側６の下部に取付、
冷水が凍結に至る直前の温度を検知し冷水温度検知サー
モスタット１３がその接点を閉じ小容量冷水ポンプのＭ
ｇ５Ｗ１５が励磁され、小容量冷水ポンプが運転する９
また、この小容量冷水ポンプ８は水冷却器２の冷水出口
部６より逆止弁９を介して冷水入口部７に接続されてい
るので、水冷却器２の冷水出口部６より吸入された冷水
は小容量冷水ポンプ８を通り、逆止弁９を経て水冷却器
２の冷水入口部７に至る。この冷水は大容量冷水ポンプ
１ｏで遮断されているので内圧が上昇し、水冷却器２内
を通り。In order to prevent freezing, a heat-sensitive tube of a thermostat for detecting cold water temperature is installed at the bottom of the cold water outlet side 6 of the water cooler 2.
The temperature just before the cold water freezes is detected, and the cold water temperature detection thermostat 13 closes its contacts.
g5W15 is energized, and the small capacity cold water pump is operated 9. Also, this small capacity cold water pump 8 is connected from the cold water outlet part 6 of the water cooler 2 to the cold water inlet part 7 via the check valve 9. The cold water sucked in from the cold water outlet 6 of the water cooler 2 passes through a small capacity cold water pump 8, passes through a check valve 9, and reaches the cold water inlet 7 of the water cooler 2. Since this cold water is cut off by the large-capacity cold water pump 1o, the internal pressure increases and it passes through the water cooler 2.
再び、冷水出口部６に戻り水冷却器２と小容量冷水ポン
プ８の間のみ循環する。この冷水の循環、また小容量冷
水ポンプ８の発熱により冷水温度は徐々に上昇してくる
。冷水の温度上昇は時間を要するが小容量冷水ポンプ８
の消費電力は小さく、大容量冷水ポンプ１ｏと比較する
と節電になり、水冷却器２内の冷水の凍結防止となる。The water returns to the cold water outlet section 6 again and circulates only between the water cooler 2 and the small capacity cold water pump 8. The temperature of the cold water gradually rises due to the circulation of the cold water and the heat generated by the small capacity cold water pump 8. It takes time to raise the temperature of cold water, but small capacity cold water pump 8
The power consumption is small, and compared to the large-capacity cold water pump 1o, it saves power and prevents the cold water in the water cooler 2 from freezing.
温度上昇し一定の温度に達すると冷水温度検知サーモス
タット１３の接点が開き小容量冷水ポンプ８は停止する
。再び、冷水温度が低下すると、また、小容量冷水ポン
プ８が再運転することになる。When the temperature rises and reaches a certain temperature, the contacts of the cold water temperature detection thermostat 13 open and the small capacity cold water pump 8 stops. When the cold water temperature drops again, the small capacity cold water pump 8 will be restarted.
本実施例によれば、水冷却器２内の冷水の凍結を防止す
る効果がある。According to this embodiment, there is an effect of preventing the cold water in the water cooler 2 from freezing.
チラーユニット運転中は接点１４が開き、小容量冷水ポ
ンプ８は運転されない。While the chiller unit is operating, the contact 14 is open and the small capacity cold water pump 8 is not operated.
本発明によれば、水冷却器内に設置した冷水温度検知の
サーモスタットが冷水温度低下を検知し、冷水が凍結に
至る前に小容量冷水ポンプを水冷却器内だけ循環させる
ことが出来るので、冷水を循環させることによって水冷
却器内での凍結を防ぐことが出来る。According to the present invention, the cold water temperature detection thermostat installed in the water cooler detects a drop in the cold water temperature, and the small capacity cold water pump can circulate only within the water cooler before the cold water freezes. Freezing inside the water cooler can be prevented by circulating cold water.
第１図は本発明の一実施例の系統図、第２図は本発明の
電気配線図である。
１・・・負荷、２・・・水冷却器、３・・・圧縮機、４
・・・凝縮器、５・・・減圧装置、６・・・水冷却器冷
水出口部、７・・・水冷却器冷水入口部、８・・・小容
量冷水ポンプ、９・・・逆止弁、１０・・・大容量冷水
ポンプ、１１・・・チラーユニット、１２・・・冷水温
度検知用サーその感熱筒、１３・・・冷水温度検知サー
ミスタット、１４・・チラーユニット運転用リレー、１
５・・・小容量冷水ポンプマグネットスイッチ。FIG. 1 is a system diagram of an embodiment of the present invention, and FIG. 2 is an electrical wiring diagram of the present invention. 1...Load, 2...Water cooler, 3...Compressor, 4
... Condenser, 5... Pressure reducing device, 6... Water cooler cold water outlet, 7... Water cooler cold water inlet, 8... Small capacity cold water pump, 9... Back check Valve, 10...Large capacity cold water pump, 11...Chiller unit, 12...Cold water temperature detection thermosensitive tube, 13...Cold water temperature detection thermistat, 14...Relay for chiller unit operation, 1
5...Small capacity cold water pump magnetic switch.
Claims (1)
ユニツトにおいて、 前記チラーユニツトが運転停止中で、しかも、外気温度
が低下し前記水冷却器内の冷水が凍結の恐れがある一定
温度以下に達した場合のみ、前記水冷却器の冷水出口側
から吸入され、前記水冷却器の冷水入口側へ吐出し前記
水冷却器のみ冷水を循環させる小容量の冷水ポンプを前
記水冷却器の冷水出入口に設けたことを特徴とする年間
運転形チラーユニツト。[Scope of Claims] 1. In a chiller unit including a compressor, a condenser, a decompression device, and a water cooler, when the chiller unit is out of operation and the outside air temperature drops and the chilled water in the water cooler freezes. A small-capacity cold water pump is installed that circulates only the cold water in the water cooler by sucking it in from the cold water outlet side of the water cooler and discharging it to the cold water inlet side of the water cooler only when the temperature reaches a certain level or below. A year-round operation type chiller unit, characterized in that it is installed at the cold water inlet and outlet of the water cooler.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13375690A JPH0428985A (en) | 1990-05-25 | 1990-05-25 | Chiller unit for all the year |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13375690A JPH0428985A (en) | 1990-05-25 | 1990-05-25 | Chiller unit for all the year |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0428985A true JPH0428985A (en) | 1992-01-31 |
Family
ID=15112214
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13375690A Pending JPH0428985A (en) | 1990-05-25 | 1990-05-25 | Chiller unit for all the year |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0428985A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5582450A (en) * | 1993-08-31 | 1996-12-10 | Smc Kabushiki Kaisha | Suction pad, rotation-stop and guide mechanism for the same |
-
1990
- 1990-05-25 JP JP13375690A patent/JPH0428985A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5582450A (en) * | 1993-08-31 | 1996-12-10 | Smc Kabushiki Kaisha | Suction pad, rotation-stop and guide mechanism for the same |
| US5707093A (en) * | 1993-08-31 | 1998-01-13 | Smc Kabushiki Kaisha | Suction pad, rotation--stop and guide mechanism for the same |
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