JPH0674572A - Air-conditioner - Google Patents
Air-conditionerInfo
- Publication number
- JPH0674572A JPH0674572A JP22880692A JP22880692A JPH0674572A JP H0674572 A JPH0674572 A JP H0674572A JP 22880692 A JP22880692 A JP 22880692A JP 22880692 A JP22880692 A JP 22880692A JP H0674572 A JPH0674572 A JP H0674572A
- Authority
- JP
- Japan
- Prior art keywords
- evaporator
- compressor
- temperature
- expansion valve
- refrigerant
- 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.)
- Granted
Links
Landscapes
- Air Conditioning Control Device (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、外均式膨張弁を用いた
空気調和機に係り、特に液状の冷媒が蒸発器から圧縮機
に戻るのを防止することができる空気調和機に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner using an external equalization type expansion valve, and more particularly to an air conditioner capable of preventing liquid refrigerant from returning from an evaporator to a compressor.
【０００２】[0002]
【従来の技術】図７は、外均式膨張弁を用いた従来の空
気調和機を示すもので、図中、符号１は圧縮機であり、
この圧縮機１には、凝縮器２、外均式膨張弁３および蒸
発器４が順次接続されて冷凍サイクルを構成している。
また、前記外均式膨張弁３の均圧管５は、図７に示すよ
うに、圧縮機１と蒸発器４との間に接続されているとと
もに、この接続部よりも上流側、すなわち蒸発器４側の
位置には、外均式膨張弁３の感温筒６が設置されてい
る。2. Description of the Related Art FIG. 7 shows a conventional air conditioner using an external equalization type expansion valve. In the figure, reference numeral 1 is a compressor,
A condenser 2, an external equalization type expansion valve 3 and an evaporator 4 are sequentially connected to the compressor 1 to form a refrigeration cycle.
Further, as shown in FIG. 7, the pressure equalizing pipe 5 of the external equalization type expansion valve 3 is connected between the compressor 1 and the evaporator 4, and is upstream of this connecting portion, that is, the evaporator. The temperature sensing cylinder 6 of the external equalization type expansion valve 3 is installed at the position on the 4th side.
【０００３】一方、前記圧縮機１の吐出側には、図７に
示すように、電磁弁７を有するバイパス回路８の一端が
接続されており、このバイパス回路８の他端は、前記均
圧管５よりも下流側の圧縮機１の吸込側に接続されてい
る。On the other hand, as shown in FIG. 7, one end of a bypass circuit 8 having an electromagnetic valve 7 is connected to the discharge side of the compressor 1, and the other end of the bypass circuit 8 is connected to the pressure equalizing pipe. It is connected to the suction side of the compressor 1 downstream of 5.
【０００４】以上の構成において、低負荷時の運転中
に、蒸発器４が凍結し始めると、蒸発温度が低下する。
そして、この蒸発温度が設定値を下回ると、電磁弁７が
開となり、圧縮機１から吐出された冷媒の一部が、直接
圧縮機１の吸込側に戻される。このため、蒸発器４への
冷媒循環量が低減し、蒸発器４の凍結が防止される。In the above construction, if the evaporator 4 starts to freeze during operation under a low load, the evaporation temperature will drop.
Then, when the evaporation temperature falls below the set value, the solenoid valve 7 is opened, and a part of the refrigerant discharged from the compressor 1 is directly returned to the suction side of the compressor 1. For this reason, the refrigerant circulation amount to the evaporator 4 is reduced, and the evaporator 4 is prevented from freezing.
【０００５】[0005]
【発明が解決しようとする課題】前記従来の空気調和機
においては、低負荷時に蒸発器４の凍結を防止すること
ができるが、さらに低負荷となった場合には、蒸発器４
で冷媒が蒸発しきれず、液状の冷媒が直接圧縮機１に戻
る、いわゆる液バックが発生し、この状態で運転を継続
すると、圧縮機１が故障するという問題がある。本発明
は、かかる現況に鑑みなされたもので、蒸発器からの液
バックをなくして圧縮機の液圧縮による故障を防止する
ことができる空気調和機を提供することを目的とする。In the conventional air conditioner described above, the evaporator 4 can be prevented from freezing when the load is low, but when the load is further lower, the evaporator 4 can be prevented.
Therefore, there is a problem that the refrigerant cannot be completely evaporated and the liquid refrigerant directly returns to the compressor 1, so-called liquid back occurs, and if the operation is continued in this state, the compressor 1 fails. The present invention has been made in view of the current situation, and an object thereof is to provide an air conditioner capable of preventing a liquid bag from an evaporator and preventing a failure due to liquid compression of a compressor.
【０００６】[0006]
【課題を解決するための手段】本発明は、前記目的を達
成する手段として、圧縮機、凝縮器、外均式膨張弁、お
よび蒸発器を順次接続して冷凍サイクルを構成するとと
もに、前記圧縮機の吐出側と吸込側とを、開閉弁を有す
るバイパス回路で接続し、蒸発器での蒸発温度が低下し
た際に、前記開閉弁を開いて蒸発器への冷媒循環量を低
減させる空気調和機において、前記外均式膨張弁の均圧
管を、圧縮機と蒸発器との間に接続するとともに、この
接続部よりも蒸発器寄りに、外均式膨張弁の感温筒を設
け、かつ前記バイパス回路を、前記均圧管の接続部と感
温筒との間に接続するようにしたことを特徴とする。As a means for achieving the above object, the present invention constitutes a refrigeration cycle by sequentially connecting a compressor, a condenser, an external equalization type expansion valve, and an evaporator, and An air conditioner that connects the discharge side and the suction side of the machine with a bypass circuit having an on-off valve and opens the on-off valve to reduce the amount of refrigerant circulation to the evaporator when the evaporation temperature in the evaporator decreases. In the machine, the pressure equalizing pipe of the external equalization expansion valve is connected between the compressor and the evaporator, and the temperature-sensing cylinder of the external equalization expansion valve is provided closer to the evaporator than this connecting portion, and The bypass circuit is connected between the connecting portion of the pressure equalizing tube and the temperature sensitive tube.
【０００７】[0007]
【作用】本発明に係る空気調和機においては、バイパス
回路からの冷媒が、外均式膨張弁の均圧管接続部よりも
上流側に戻される。このため、冷媒がバイパスすると、
均圧管圧力が上昇し、見掛け上の過熱度が低下する。そ
してこれにより、外均式膨張弁の開度が絞られて蒸発器
への冷媒循環量がさらに低減し、蒸発器からの液バック
がなくなる。In the air conditioner according to the present invention, the refrigerant from the bypass circuit is returned to the upstream side of the pressure equalizing pipe connecting portion of the external equalization type expansion valve. Therefore, when the refrigerant bypasses,
The pressure equalizing pipe pressure rises, and the apparent degree of superheat decreases. As a result, the opening degree of the external equalization type expansion valve is narrowed, the refrigerant circulation amount to the evaporator is further reduced, and liquid back from the evaporator is eliminated.
【０００８】[0008]
【実施例】以下、本発明を図面を参照して説明する。図
１は、本発明の第１実施例に係る空気調和機を示すもの
で、図中、符号１は圧縮機であり、この圧縮機１には、
凝縮器２、外均式膨張弁３および蒸発器４が順次接続さ
れて冷凍サイクルを構成している。そして、圧縮機１の
吐出関温度ｔｄは、吐出管温度センサ９により検出され
るとともに、この凝縮器２の凝縮温度ｔｃは、凝縮温度
センサ１０により検出され、さらに蒸発器４の蒸発温度
ｔｅは、蒸発温度センサ１１により検出されるようにな
っている。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. FIG. 1 shows an air conditioner according to a first embodiment of the present invention. In the figure, reference numeral 1 is a compressor, and the compressor 1 includes:
The condenser 2, the external equalization type expansion valve 3 and the evaporator 4 are sequentially connected to form a refrigeration cycle. The discharge temperature td of the compressor 1 is detected by the discharge pipe temperature sensor 9, the condensation temperature tc of the condenser 2 is detected by the condensation temperature sensor 10, and the evaporation temperature te of the evaporator 4 is The evaporation temperature sensor 11 detects the evaporation temperature.
【０００９】前記外均式膨張弁３の均圧管５は、図１に
示すように、圧縮機１と蒸発器４との間に接続されてお
り、この接続部４との間には、外均式膨張弁３の感温筒
６が設置されている。また、前記圧縮機１の吐出側に
は、図１に示すように、電磁弁７を有するバイパス回路
８の一端が接続されており、このバイパス回路８の他端
は、前記均圧管５の接続部よりも上流側でしかも感温筒
６よりも下流側の部位に接続されている。そして、この
バイパス回路８の電磁弁７は、図２に示す制御フローに
従い、前記蒸発温度センサ１１からの蒸発温度ｔｅに基
づき開閉制御されるようになっている。The pressure equalizing pipe 5 of the external equalization type expansion valve 3 is connected between the compressor 1 and the evaporator 4 as shown in FIG. The temperature-sensitive cylinder 6 of the uniform expansion valve 3 is installed. Also, as shown in FIG. 1, one end of a bypass circuit 8 having an electromagnetic valve 7 is connected to the discharge side of the compressor 1, and the other end of the bypass circuit 8 is connected to the pressure equalizing pipe 5. It is connected to a site upstream of the section and downstream of the temperature-sensitive cylinder 6. The solenoid valve 7 of the bypass circuit 8 is controlled to open / close based on the evaporation temperature te from the evaporation temperature sensor 11 according to the control flow shown in FIG.
【００１０】次に、本実施例の作用について説明する。
図２において、低負荷時の運転中（ステップＳ１）に、
蒸発器４が凍結し始めると、蒸発温度ｔｅが低下する。
そこで、ステップＳ２において、蒸発温度ｔｅが電磁弁
開温度ＴE1より低いか否かを判別する。そして、低いば
あには、ステップＳ３において、電磁弁７を開く。する
と、圧縮機１の吐出側から吸込側に、冷媒の一部がバイ
パスされ、蒸発器４への冷媒循環量が低下する。これに
より、蒸発器４の凍結が防止される。Next, the operation of this embodiment will be described.
In FIG. 2, during operation at low load (step S1),
When the evaporator 4 starts to freeze, the evaporation temperature te decreases.
Therefore, in step S2, it is determined whether the evaporation temperature te is lower than the electromagnetic valve opening temperature T E1 . Then, in the low level, the solenoid valve 7 is opened in step S3. Then, a part of the refrigerant is bypassed from the discharge side of the compressor 1 to the suction side, and the refrigerant circulation amount to the evaporator 4 is reduced. This prevents the evaporator 4 from freezing.
【００１１】次いで、ステップＳ４において、蒸発温度
ｔｅが電磁弁閉温度ＴE2よりも高いか否かを判別し、高
い場合には、ステップＳ５において、電磁弁７を閉じた
後、ステップＳ２に戻る。ところで、ステップＳ３にお
いて、電磁弁７が開いて、冷媒の一部がバイパスされる
と、バイパスされた冷媒は、外均式膨張弁３の均圧管５
の上流側に戻されることになる。ここで、膨張弁３は、
次式により過熱度ＳＨを一定に保つように構成されてい
る。 過熱度ＳＨ＝感温筒温度−均圧管圧力の飽和温度 したがって、電磁弁７が開いて均圧管が上昇すると、見
掛け上の過熱度ＳＨが低下し、外均式膨張弁３は、さら
に開度が絞られることになる。このため、蒸発器４への
冷媒循環量がさらに低減し、大幅に低負荷となった場合
であっても、液バックを防止して、液圧縮にる圧縮機１
の故障を防止することができる。Next, in step S4, it is judged whether or not the evaporation temperature te is higher than the electromagnetic valve closing temperature T E2 , and if it is higher, the electromagnetic valve 7 is closed in step S5 and the process returns to step S2. . By the way, in step S3, when the solenoid valve 7 is opened and a part of the refrigerant is bypassed, the bypassed refrigerant is supplied to the pressure equalizing pipe 5 of the outer equalization expansion valve 3.
Will be returned to the upstream side of. Here, the expansion valve 3 is
The following formula is used to keep the superheat degree SH constant. Superheat degree SH = Temperature-sensing cylinder temperature-Saturation temperature of pressure equalizing pipe pressure Therefore, when the solenoid valve 7 opens and the pressure equalizing pipe rises, the apparent superheat degree SH decreases, and the outer equalizing expansion valve 3 further opens. Will be narrowed down. For this reason, even if the refrigerant circulation amount to the evaporator 4 is further reduced and the load is drastically reduced, liquid back is prevented and the compressor 1 that performs liquid compression is used.
It is possible to prevent the breakdown.
【００１２】図３は、本発明の第２実施例を示すもの
で、電磁弁７の開閉制御を、凝縮温度ｔｃに基づき行な
うようにしたものである。すなわち、図３において、低
負荷時の運転中（ステップＳ１１）に、蒸発器４が凍結
し始めると、凝縮温度ｔｃが低下する。そこで、ステッ
プＳ１２において、凝縮温度ｔｃが電磁弁開温度Ｔc1よ
り低いか否かを判別する。そして、低い場合には、ステ
ップＳ１３において、電磁弁７を開く。これにより、前
記第１実施例の場合と同様、蒸発器４への冷媒循環量が
低減し、蒸発器４の凍結が防止される。次いで、ステッ
プＳ１４において、凝縮温度ｔｃが電磁弁閉温度Ｔc2よ
り高いか否かを判別し、高い場合には、ステップＳ１５
において、電磁弁７を閉じた後、ステップＳ１２に戻
る。しかして、蒸発温度ｔｅに代えて凝縮温度ｔｃを用
いても、前記第１実施例と同様の効果が期待できる。FIG. 3 shows a second embodiment of the present invention, in which the opening / closing control of the solenoid valve 7 is performed based on the condensation temperature tc. That is, in FIG. 3, when the evaporator 4 starts to freeze during the operation under low load (step S11), the condensation temperature tc decreases. Therefore, in step S12, it is determined whether the condensing temperature tc is lower than the electromagnetic valve opening temperature T c1 . If it is lower, the solenoid valve 7 is opened in step S13. As a result, as in the case of the first embodiment, the refrigerant circulation amount to the evaporator 4 is reduced, and the evaporator 4 is prevented from freezing. Next, in step S14, it is determined whether or not the condensing temperature tc is higher than the electromagnetic valve closing temperature T c2 , and if it is higher, step S15.
In, after closing the solenoid valve 7, the process returns to step S12. Even if the condensation temperature tc is used instead of the evaporation temperature te, the same effect as that of the first embodiment can be expected.
【００１３】図４は、本発明の第３実施例を示すもの
で、電磁弁７の開閉制御と、吐出管温度ｔｄに基づき行
なうようにしたものである。すなわち、図４において、
低負荷時の運転中（ステップＳ２１）に、蒸発器４が凍
結し始めると、吐出管温度ｔｄが低下する。そこで、ス
テップＳ２２において、吐出管温度ｔｄが電磁弁ｔｄが
電磁弁開温度ＴD1より低いか否かを判別する。そして、
低い場合には、ステップＳ２３において、電磁弁７を開
く。これにより、前記第１実施例の場合と同様、蒸発器
４への冷媒循環量が低減し、蒸発器４の凍結が防止され
る。FIG. 4 shows a third embodiment of the present invention, in which opening / closing control of the solenoid valve 7 and the discharge pipe temperature td are performed. That is, in FIG.
When the evaporator 4 starts to freeze during operation under low load (step S21), the discharge pipe temperature td decreases. Therefore, in step S22, it is determined whether the discharge pipe temperature td is lower than the solenoid valve open temperature T D1 of the solenoid valve td. And
If it is lower, the solenoid valve 7 is opened in step S23. As a result, as in the case of the first embodiment, the refrigerant circulation amount to the evaporator 4 is reduced, and the evaporator 4 is prevented from freezing.
【００１４】次いで、ステップＳ２４において、吐出管
温度ｔｄが電磁弁閉温度ＴD2より高いか否かを判別し、
高い場合には、ステップＳ２５において、電磁弁７を閉
じた後、ステップＳ２２に戻る。しかして、蒸発温度ｔ
ｅに代えて吐出管温度ｔｄを用いても、前記第１実施例
と同様の効果が期待できる。Next, at step S24, it is judged if the discharge pipe temperature td is higher than the electromagnetic valve closing temperature T D2 .
If it is higher, the solenoid valve 7 is closed in step S25, and the process returns to step S22. Then, the evaporation temperature t
Even if the discharge pipe temperature td is used instead of e, the same effect as that of the first embodiment can be expected.
【００１５】図５は、本発明の第４実施例を示すもの
で、バイパス回路８の電磁弁７の出側位置に、キャピラ
リチューブ１２を設けるようにしたものである。なお、
その他の点については、前記第１実施例と同一構成とな
っており、作用も同一である。FIG. 5 shows a fourth embodiment of the present invention, in which a capillary tube 12 is provided at the exit side position of the solenoid valve 7 of the bypass circuit 8. In addition,
The other points are the same as those of the first embodiment, and the operation is the same.
【００１６】しかして、キャピラリチューブ１２を用い
ることにより、バイパス量を調整することができる。Therefore, by using the capillary tube 12, the bypass amount can be adjusted.
【００１７】図６は、本発明の第５実施例を示すもの
で、前記第４実施例の場合とは逆に、バイパス回路８の
電磁弁７入側位置に、キャピラリチューブ１２を設ける
ようにしたものである。なお、その他の点については、
前記第１実施例と同一構成となっており、作用も同一で
ある。しかして、電磁弁７の入側位置にキャピラリチュ
ーブ１２を設けても、前記第４実施例と同様の効果が期
待できる。FIG. 6 shows a fifth embodiment of the present invention. Contrary to the case of the fourth embodiment, a capillary tube 12 is provided at the solenoid valve 7 inlet side position of the bypass circuit 8. It was done. Regarding other points,
It has the same structure as that of the first embodiment and the same operation. Therefore, even if the capillary tube 12 is provided at the inlet side position of the solenoid valve 7, the same effect as that of the fourth embodiment can be expected.
【００１８】[0018]
【発明の効果】以上説明したように本発明は、バイパス
回路によりバイパスする冷媒は、外均式膨張弁の均圧管
よりも上流側に戻すようにしているので、大幅な低負荷
時においても、蒸発器からの液バックをなくし、液圧縮
による圧縮機の故障を防止することができる。As described above, according to the present invention, the refrigerant bypassed by the bypass circuit is returned to the upstream side of the pressure equalizing pipe of the external equalization type expansion valve. By eliminating the liquid bag from the evaporator, it is possible to prevent breakdown of the compressor due to liquid compression.
【図１】本発明の第１実施例に係る空気調和機を示す構
成図。FIG. 1 is a configuration diagram showing an air conditioner according to a first embodiment of the present invention.
【図２】図１の電磁弁の制御手順を示すフローチャー
ト。FIG. 2 is a flowchart showing a control procedure of the solenoid valve of FIG.
【図３】本発明の第２実施例に係る空気調和機を示す図
２相当図。FIG. 3 is a view corresponding to FIG. 2 showing an air conditioner according to a second embodiment of the present invention.
【図４】本発明の第３実施例に係る空気調和機を示す図
２相当図。FIG. 4 is a view corresponding to FIG. 2 showing an air conditioner according to a third embodiment of the present invention.
【図５】本発明の第４実施例に係る空気調和機を示す要
部構成図。FIG. 5 is a main part configuration diagram showing an air conditioner according to a fourth embodiment of the present invention.
【図６】本発明の第５実施例に係る空気調和機を示す要
部構成図。FIG. 6 is a main part configuration diagram showing an air conditioner according to a fifth embodiment of the present invention.
【図７】従来の空気調和機を示す構成図。FIG. 7 is a configuration diagram showing a conventional air conditioner.
１ 圧縮機 ２ 凝縮器 ３ 外均式膨張弁 ４ 蒸発器 ５ 均圧管 ６ 感温筒 ７ 電磁弁 ８ バイパス回路 １１ 蒸発温度センサ １２ キャピラリチューブ 1 Compressor 2 Condenser 3 External equalization expansion valve 4 Evaporator 5 Pressure equalizing tube 6 Temperature sensing tube 7 Solenoid valve 8 Bypass circuit 11 Evaporation temperature sensor 12 Capillary tube
Claims (1)
発器を順次接続して冷凍サイクルを構成するとともに、
前記圧縮機の吐出側と吸込側とを、開閉弁を有するバイ
パス回路で接続し、蒸発器での蒸発温度が低下した際
に、前記開閉弁を開いて蒸発器への冷媒循環量を低減さ
せる空気調和機において、前記外均式膨張弁の均圧管
を、圧縮機と蒸発器との間に接続するとともに、この接
続部よりも蒸発器寄りに、外均式膨張弁の感温筒を設
け、かつ前記バイパス回路を、前記均圧管の接続部と感
温筒との間に接続したことを特徴とする空気調和機。1. A refrigeration cycle is constructed by sequentially connecting a compressor, a condenser, an external equalization type expansion valve, and an evaporator, and
The discharge side and the suction side of the compressor are connected by a bypass circuit having an opening / closing valve, and when the evaporation temperature in the evaporator is lowered, the opening / closing valve is opened to reduce the amount of refrigerant circulation to the evaporator. In the air conditioner, the pressure equalizing pipe of the external equalization expansion valve is connected between the compressor and the evaporator, and the temperature-sensing cylinder of the external equalization expansion valve is provided closer to the evaporator than this connecting portion. An air conditioner characterized in that the bypass circuit is connected between the connection part of the pressure equalizing pipe and the temperature sensing cylinder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22880692A JP3260844B2 (en) | 1992-08-27 | 1992-08-27 | Air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22880692A JP3260844B2 (en) | 1992-08-27 | 1992-08-27 | Air conditioner |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0674572A true JPH0674572A (en) | 1994-03-15 |
| JP3260844B2 JP3260844B2 (en) | 2002-02-25 |
Family
ID=16882150
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22880692A Expired - Fee Related JP3260844B2 (en) | 1992-08-27 | 1992-08-27 | Air conditioner |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3260844B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115111705A (en) * | 2022-08-25 | 2022-09-27 | 蘑菇物联技术（深圳）有限公司 | Method, equipment and medium for detecting water flow bypass fault of water chilling unit |
-
1992
- 1992-08-27 JP JP22880692A patent/JP3260844B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115111705A (en) * | 2022-08-25 | 2022-09-27 | 蘑菇物联技术（深圳）有限公司 | Method, equipment and medium for detecting water flow bypass fault of water chilling unit |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3260844B2 (en) | 2002-02-25 |
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| A01 | Written decision to grant a patent or to grant a registration (utility model) |
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| LAPS | Cancellation because of no payment of annual fees |