JPH0441153A - Cooling device for built-in motor - Google Patents

Cooling device for built-in motor

Info

Publication number
JPH0441153A
JPH0441153A JP14970090A JP14970090A JPH0441153A JP H0441153 A JPH0441153 A JP H0441153A JP 14970090 A JP14970090 A JP 14970090A JP 14970090 A JP14970090 A JP 14970090A JP H0441153 A JPH0441153 A JP H0441153A
Authority
JP
Japan
Prior art keywords
cooler
compressor
built
cooling unit
motor
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
Application number
JP14970090A
Other languages
Japanese (ja)
Inventor
Kiyoshi Masuda
潔 増田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Daikin Industries Ltd
Original Assignee
Daikin Industries Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Daikin Industries Ltd filed Critical Daikin Industries Ltd
Priority to JP14970090A priority Critical patent/JPH0441153A/en
Publication of JPH0441153A publication Critical patent/JPH0441153A/en
Pending legal-status Critical Current

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  • Devices That Are Associated With Refrigeration Equipment (AREA)

Abstract

PURPOSE:To prevent a cooler from breakage by arranging the cooler at the upper part in the specified height for a cooling unit connecting the outlet side piping of an expansion mechanism to the bottom of the cooler, attaching a fan for condenser air cooling as well, and providing a control circuit which drives the fan at the emergency stoppage time of a compressor. CONSTITUTION:The refrigerant of the cooler 4 inside can be flowed downward from the outlet side piping 33 of the expansion mechanism 3 which is connected to the bottom of the cooler 4, because the cooler 4 is arranged upward in the specified height for a cooling unit 5, when a built-in motor 16 causes an abnormal heating and the compressor 1 of the cooling unit 5 causes an abnormal stop accordingly. At this time, moreover, a condenser 2 is cooled with the fan 21 attached to the condenser 2 being driven by a control circuit 22, the refrigerant pressure of the cooling unit 5 side is reduced, the pressure difference in the space with the refrigerant pressure of the cooler 4 inside is increased and the liquid return to the cooling unit 5 side is promoted. The breakdown of the cooler 4 can thus be prevented.

Description

【発明の詳細な説明】 (産業上の利用分野) 本発明は、旋盤等の工作機械における主軸の軸受部や主
軸に直結するビルトインモータを冷却する冷却装置に関
する。
DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a cooling device for cooling a bearing portion of a main spindle of a machine tool such as a lathe or a built-in motor directly connected to the main spindle.

(従来の技術) 従来、冷却器を冷[装置の冷却器として、冷媒の蒸発作
用によりビルトインモータを冷却するようにしたものは
すでに知られているが、本発明の発明者は、先に第3図
に示したような冷却装置を提案した。つまり、第3図に
示す冷却装置は、ビルトインモータ(A)に冷却器(B
)を付設し、該冷却器(B)を、圧縮機(C)、凝縮器
(D)及び膨張機構(E)を備えた冷却ユニッ) (F
)における前記膨張機構(E)の出口側と圧縮機(C)
の吸入側との間に接続し、前記冷却器(B)を蒸発器と
して前記ビルトインモータ(A)を冷却するようにして
、さらに、前記冷却器(B)の出口側と前記圧縮機(C
)の吸入側との間に、減圧機構(G)を介装したもので
、この減圧機構(G)を介装することにより、通常の圧
縮機を用いながら前記減圧機構(G)による圧力ドロッ
プの分だけ、前記冷却器(B)での蒸発圧力を圧縮機(
C)の吸入圧力に対し高めて、前記冷却器(B)による
過度の冷却を防止しながら、前記圧縮機(C)の吸入圧
力は低くして該圧縮機(C)を高圧縮比で運転すること
ができるようにして、外気に触れる主軸部と前記冷却器
(B)により冷却される主軸部との間の温度差により熱
膨張の差が生ずるのをなりシ、加工精度に悪影響が出な
いようにすると共に、前記ビルトインモータの外壁部に
結露が発生しないようにしたものである。
(Prior Art) Conventionally, a cooler is already known that is used as a cooler for a device to cool a built-in motor by the evaporation action of a refrigerant. We proposed a cooling device as shown in Figure 3. In other words, the cooling device shown in Fig. 3 has a built-in motor (A) and a cooler (B).
), and the cooler (B) is a cooling unit equipped with a compressor (C), a condenser (D) and an expansion mechanism (E)
) and the outlet side of the expansion mechanism (E) and the compressor (C)
The built-in motor (A) is cooled by using the cooler (B) as an evaporator, and the cooler (B) is connected between the outlet side of the cooler (B) and the compressor (C).
) and the suction side of the compressor. By installing this pressure reducing mechanism (G), the pressure drop caused by the pressure reducing mechanism (G) can be reduced while using a normal compressor. The evaporation pressure in the cooler (B) is reduced by the amount of the compressor (
The suction pressure of the compressor (C) is lowered to operate the compressor (C) at a high compression ratio, while increasing the suction pressure of the compressor (C) to prevent excessive cooling by the cooler (B). This prevents a difference in thermal expansion from occurring due to a temperature difference between the main shaft part exposed to the outside air and the main shaft part cooled by the cooler (B), which adversely affects machining accuracy. This also prevents dew condensation from forming on the outer wall of the built-in motor.

(発明が解決しようとする課題) しかし、以上のごとく構成する冷却装置において、前記
ビルトインモータ(A)の負荷が所定範囲にある場合に
は問題がないのであるが、工作機械側の負荷の増大で、
前記モータ(A)に負荷がかかり過ぎて前記冷却器(B
)の冷却にも拘らず、該ビルトインモータ(A)が異常
に発熱する場合、この異常高温状態により前記冷却ユニ
ット(F)の前記圧縮機(C)の吸入側の冷媒圧力及び
温度が異常に高くなって該圧縮機(C)が異常停止する
ことになるため、前記ビルトインモータ(A)の冷却器
(B)内の冷媒が異常高温下に置かれることになって、
圧力が異常に高まり、場合によっては前記冷却器(B)
が破損するという危険があった。
(Problem to be Solved by the Invention) However, in the cooling device configured as described above, there is no problem if the load on the built-in motor (A) is within a predetermined range, but the load on the machine tool side increases. in,
The motor (A) is overloaded and the cooler (B)
) If the built-in motor (A) generates abnormal heat despite cooling, the refrigerant pressure and temperature on the suction side of the compressor (C) of the cooling unit (F) may become abnormal due to this abnormally high temperature state. Since the compressor (C) will stop abnormally due to the high temperature, the refrigerant in the cooler (B) of the built-in motor (A) will be placed under an abnormally high temperature.
If the pressure increases abnormally, the cooler (B) may
There was a risk that it would be damaged.

本発明は、以上のような問題に鑑みて成したもので、そ
の目的は、ビルトインモータが異常高温になった場合で
も、該ビルトインモータの冷却器の冷媒が、異常高圧状
態となるのを回避でき、前記冷却器が破損するのを未然
に防止することができる冷却装置を提供する点にある。
The present invention was made in view of the above problems, and its purpose is to prevent the refrigerant in the cooler of the built-in motor from becoming abnormally high pressure even if the built-in motor reaches an abnormally high temperature. The object of the present invention is to provide a cooling device that can prevent the cooler from being damaged.

(課題を解決するための手段) そこで、本発明では、上記目的を達成するために、ビル
トインモータ(16)に冷却器(4)を付設し、該冷却
器(4)を、圧縮機(1)、凝縮器(2)、受液器(6
)及び膨張機構(3)を備えた冷却ユニット(5)にお
ける前記膨張機構(3)の出口側と圧縮機(1)の吸入
側との間に接続し、前記冷却器(4)を蒸発器として前
記ビルトインモータ(16)を冷却するようにした冷却
装置において、前記冷却器(4)を、冷却ユニット(5
)に対し、所定高さ上方に配置して、前記冷却器(4)
の底部に前記膨張機構(3)の出口側配管(33)を接
続すると共に、前記凝縮器(2)を空冷としてファン(
21)を付設する一方、前記圧縮機(1)の異常停止時
、前記ファン(21)を駆動する制御回路(22)を設
けたのである。
(Means for Solving the Problem) Therefore, in the present invention, in order to achieve the above object, a cooler (4) is attached to the built-in motor (16), and the cooler (4) is connected to the compressor (1). ), condenser (2), liquid receiver (6
) and an expansion mechanism (3), the cooling unit (5) is connected between the outlet side of the expansion mechanism (3) and the suction side of the compressor (1), and the cooler (4) is connected to the evaporator. In the cooling device that cools the built-in motor (16), the cooler (4) is connected to a cooling unit (5).
), the cooler (4) is placed above the cooler (4) at a predetermined height.
The outlet side piping (33) of the expansion mechanism (3) is connected to the bottom of the expansion mechanism (3), and the condenser (2) is cooled by a fan (
21), and a control circuit (22) for driving the fan (21) when the compressor (1) stops abnormally.

また、前記膨張機構(3)の入口側と出口側との間に該
膨張機構(3)を側路するバイパス路(34)を設け、
該バイパス路(34)に圧縮機(1)の異常停止時にお
ける冷却器(4)から返流する液冷媒の流れのみを許す
逆止弁(35)を設けるようにするのが好ましい。
Further, a bypass passage (34) for bypassing the expansion mechanism (3) is provided between the inlet side and the outlet side of the expansion mechanism (3),
Preferably, the bypass passage (34) is provided with a check valve (35) that allows only the flow of liquid refrigerant flowing back from the cooler (4) when the compressor (1) stops abnormally.

(作用) ビルトインモータ(16)が異常発熱を起こし、それに
伴って冷却ユニット(5)の圧縮機(1)が異常停止し
たときには、前記冷却器(4)を、冷却ユニット(5)
に対し、所定高さ上方に配置しているので、前記冷却器
(4)の底部に接続した前記膨張機構(3)の出口側配
管(33)から、前記冷却器(4)内の冷媒を下方に流
すことができるし、しかも、このとき前記制御回路(2
2)により前記凝縮器(2)に付設したファン(21)
を駆動させて前記凝縮器(2)を冷却し、前記冷却ユニ
ット(5)側の冷媒圧力を低下させ、前記冷却器(4)
内の冷媒圧力との間の圧力差を増大させ、前記冷却ユニ
ット(5)側への液戻りを促進させているから、前記冷
却器(4)内の冷媒を前記冷却ユニット(5)側に戻し
て前記冷却器(4)の冷媒を空状にでき、従って、異常
高温状態となった前記ビルトインモータ(16)によっ
て前記冷却器(4)の冷媒が異常高圧になるのを回避で
き、該冷却器(4)が破損するのを未然に防止できるの
である。
(Function) When the built-in motor (16) generates abnormal heat and the compressor (1) of the cooling unit (5) stops abnormally, the cooler (4) is removed from the cooling unit (5).
Since the refrigerant in the cooler (4) is disposed at a predetermined height above the cooler (4), the refrigerant in the cooler (4) can be drawn from the outlet pipe (33) of the expansion mechanism (3) connected to the bottom of the cooler (4). The flow can be made downward, and at this time, the control circuit (2
2) a fan (21) attached to the condenser (2);
is driven to cool the condenser (2), reduce the refrigerant pressure on the cooling unit (5) side, and drive the condenser (4).
This increases the pressure difference between the refrigerant pressure in the cooler (4) and promotes liquid return to the cooling unit (5). The refrigerant in the cooler (4) can be returned to the empty state, and therefore, the refrigerant in the cooler (4) can be prevented from becoming abnormally high pressure due to the built-in motor (16) in an abnormally high temperature state. This can prevent the cooler (4) from being damaged.

また、前記膨張機構(3)の入口側と出口側との間に前
記バイパス路(34)を設けることにより、前記冷却器
(4)から前記冷却ユニット(5)側に戻される冷媒は
、前記膨張機構(3)を側路する前記バイパス路(34
)を通って前記受液器(6)に抵抗少なく円滑に戻し、
該受液器(6)に溜め込むことができるのである。
Further, by providing the bypass path (34) between the inlet side and the outlet side of the expansion mechanism (3), the refrigerant returned from the cooler (4) to the cooling unit (5) side can be The bypass passage (34) bypasses the expansion mechanism (3).
) and return it smoothly to the liquid receiver (6) with little resistance;
The liquid can be stored in the liquid receiver (6).

(実施例) 第1図に示す冷却装置は、工作機械である旋盤の主軸頭
(10)に冷却器(4)を設け、該冷却器(4)をロー
タリー式等の圧縮機(1)、ファン(21)を付設する
空冷凝縮器(2)、感温膨張弁で構成する膨張機構(3
)を備える冷却ユニット(5)における前記膨張機構(
3)の出口側の液配管(33)と前記圧縮機(1)の吸
入側のガス配管(41)との間に接続して、蒸発器とし
て用いたものである。
(Example) The cooling device shown in FIG. 1 is a machine tool, such as a lathe, with a spindle head (10) provided with a cooler (4), and the cooler (4) connected to a compressor (1) such as a rotary type. An air-cooled condenser (2) equipped with a fan (21), an expansion mechanism (3) consisting of a temperature-sensitive expansion valve
) in the cooling unit (5) comprising the expansion mechanism (
3) was connected between the liquid pipe (33) on the outlet side and the gas pipe (41) on the suction side of the compressor (1) and used as an evaporator.

また、前記冷却ユニット(5)において、該冷却ユニッ
ト(5)の前記凝縮器(2)の出口側には、受液器(6
)を設けると共に、前記冷却器(4)の出口側と圧縮機
(1)の吸入側との間に接続したガス配管(41)には
、オリフィス等で構成する減圧機構(7)を介装し、さ
らに、前記膨張機構(3)を感温膨張弁により構成して
、その感温fI(31)及び均圧管(32)を、前記減
圧機構(7)の出口側と前記圧縮機(1)の吸入側との
間のガス配管(41)に設置するのである。
Further, in the cooling unit (5), a liquid receiver (6) is provided on the outlet side of the condenser (2) of the cooling unit (5).
), and the gas pipe (41) connected between the outlet side of the cooler (4) and the suction side of the compressor (1) is equipped with a pressure reducing mechanism (7) consisting of an orifice, etc. Furthermore, the expansion mechanism (3) is constituted by a temperature-sensitive expansion valve, and its temperature-sensitive fI (31) and pressure equalization pipe (32) are connected to the outlet side of the pressure reduction mechanism (7) and the compressor (1). ) is installed in the gas piping (41) between the suction side of the gas pipe (41).

また、工作機械である前記旋盤の主軸頭(10)は、第
2図に示すように、主軸(11)と、該主軸(11)の
両端部に配設する軸受(12)(13)と、ステータ(
14)及びロータ(15)をもつ直結形のビルトインモ
ータ(16)とから構成され、これら軸受(12)(1
3)及びモータ(16)を内胴(17)内に配設し、こ
の内胴(17)を取り囲む外胴(18)及び端板(19
)(20)とで、内部を円筒形状に画成する冷媒通路部
を設けて、この冷媒通路部を冷却器(4)と成している
。また、第1図に示すように、該主軸頭(10)内に設
ける前記冷却器(4)は前記冷却ユニット(5)に対し
、所定高さ上方に配置すると共に、前記液配管(33)
を前記冷却器(4)の底部に接続し、前記ガス配管(4
1)を前記冷却器(4)の上部に接続して、前記冷却器
(4)と前記冷却ユニット(5)とのヘッド差により、
前記圧縮機(1)の停止時に、前記冷却器(4)内の液
冷媒が前記液配管(33)から前記冷却ユニット(5)
側に返流するごとくなしている。
The spindle head (10) of the lathe, which is a machine tool, has a main spindle (11) and bearings (12) and (13) disposed at both ends of the main spindle (11), as shown in FIG. , stator (
14) and a direct-coupled built-in motor (16) with a rotor (15), and these bearings (12) (1
3) and a motor (16) are arranged in an inner shell (17), and an outer shell (18) and an end plate (19) surrounding this inner shell (17).
) (20), a refrigerant passage portion having a cylindrical interior is provided, and this refrigerant passage portion serves as a cooler (4). Further, as shown in FIG. 1, the cooler (4) provided in the spindle head (10) is disposed at a predetermined height above the cooling unit (5), and the liquid pipe (33)
is connected to the bottom of the cooler (4), and the gas pipe (4) is connected to the bottom of the cooler (4).
1) is connected to the upper part of the cooler (4), and due to the head difference between the cooler (4) and the cooling unit (5),
When the compressor (1) is stopped, the liquid refrigerant in the cooler (4) flows from the liquid pipe (33) to the cooling unit (5).
It seems like the water is flowing back to the side.

さらに、第1図に示すように、前記冷却ユニット(5)
には、前記圧縮機(1)の異常高温による停止時、前記
凝縮器(2)に付設するファン(21)を駆動させて、
前記凝縮器(2)を空冷する制御回路(22)を設ける
のであり、また、前記膨張機構(3)の入口側と出口側
との間に該膨張機構(3)を側路するバイパス路(34
)を設け、該バイパス路(34)に前記圧縮機(1)の
停止時における前記冷却器(4)から返流する液冷媒の
流れのみを許す逆止弁(35)を設けるのである。
Furthermore, as shown in FIG. 1, the cooling unit (5)
When the compressor (1) is stopped due to abnormally high temperature, a fan (21) attached to the condenser (2) is driven,
A control circuit (22) for air cooling the condenser (2) is provided, and a bypass path (22) for bypassing the expansion mechanism (3) is provided between the inlet side and the outlet side of the expansion mechanism (3). 34
), and the bypass passage (34) is provided with a check valve (35) that allows only the flow of liquid refrigerant flowing back from the cooler (4) when the compressor (1) is stopped.

以上のように、前記ビルトインモータ(16)が主軸(
11)に掛かる過剰なトルクにより、大きな負荷が掛か
って該ビルトインモータ(16)が前記冷却器(4)の
冷却にもかかわらず発熱して異常発熱を起こした場合、
前記冷却ユニット(5)を運転する圧縮機(1)の吸入
側の低圧圧力が異常高圧となり、この結果、安全装置が
作用して前記圧縮機(1)が停止することになるが、こ
のとき、前記冷却器(4)は、前記冷却ユニット(5)
に対し、所定高さ上方位置に配置されているので、前記
冷却器(4)内に残っている冷媒は、該冷却器(4)の
底部に接続した前記膨張機構(3)の出口側の液配管(
33)から、前記冷却ユニット(5)側に戻され、該冷
却ユニット(5)の受液器(6)に溜め込まれるのであ
る。
As mentioned above, the built-in motor (16) is connected to the main shaft (
If a large load is applied to the built-in motor (16) due to excessive torque applied to the built-in motor (11), the built-in motor (16) generates abnormal heat despite being cooled by the cooler (4),
The low pressure on the suction side of the compressor (1) that operates the cooling unit (5) becomes abnormally high, and as a result, the safety device is activated and the compressor (1) is stopped. , the cooler (4) is connected to the cooling unit (5).
However, since the refrigerant is placed at a predetermined height above the cooler (4), the refrigerant remaining in the cooler (4) is drained from the outlet side of the expansion mechanism (3) connected to the bottom of the cooler (4). Liquid piping (
33), the liquid is returned to the cooling unit (5) and stored in the liquid receiver (6) of the cooling unit (5).

従って、前記冷却器(4)には冷媒がな(なるので、こ
の冷媒が異常高温状態となり、前記冷却器(4)内が異
常高圧になるのを回避できるのである。しかも、このと
き前記ファン(21)に接続した制御回路(22)によ
り該ファン(21)を駆動させて、前記凝縮器(2)を
空冷し、該凝縮器(2)内の冷媒の圧力を低下させて、
前記冷却器(4)内の圧力との間の圧力差を増大させら
れるので、前記冷却器(4)からの液戻りを一層促進で
き、前記受液器(6)に迅速に溜め込むことができるの
であるから、前記冷却器(4)が異常高圧になるのをよ
り確実に回避でき、該冷却器(4)の破損の危険を無く
すことができるのである。
Therefore, since there is no refrigerant in the cooler (4), it is possible to avoid the refrigerant becoming abnormally high temperature and the inside of the cooler (4) becoming abnormally high pressure. Driving the fan (21) by a control circuit (22) connected to (21) to air-cool the condenser (2) and lowering the pressure of the refrigerant in the condenser (2),
Since the pressure difference between the liquid and the pressure inside the cooler (4) can be increased, the return of the liquid from the cooler (4) can be further promoted, and the liquid can be quickly stored in the liquid receiver (6). Therefore, it is possible to more reliably prevent the cooler (4) from becoming under abnormally high pressure, and eliminate the risk of damage to the cooler (4).

また、前記膨張機構(3)の入口側と出口側との間には
前記バイパス路(34)を設けているから、前記冷却器
(4)から前記冷却ユニット(5)に戻る前記バイパス
路(34)を通って前記受液器(6)に返流させること
ができるので、前記膨張機構(3)を通ることなく、つ
まり、抵抗少なく、より積極的、かつ、迅速に前記冷却
器(4)から前記受液器(6)に溜めることができるの
である。
Moreover, since the bypass path (34) is provided between the inlet side and the outlet side of the expansion mechanism (3), the bypass path (34) returning from the cooler (4) to the cooling unit (5) 34) to the receiver (6), the liquid can be returned to the cooler (4) without passing through the expansion mechanism (3), that is, more actively and quickly with less resistance. ) can be stored in the liquid receiver (6).

(発明の効果) 以上本発明では、前記冷却器(4)を、冷却ユニット(
5)に対し、所定高さ上方に配置して、前記冷却器(4
)の底部に前記膨張機構(3)の出口側配管(33)を
接続すると共に、前記凝縮器(2)を空冷としてファン
(21)を付設する一方、前記圧縮機(1)の異常停止
時、前記ファン(21)を駆動する制御回路(22)を
設けたから、ビルトインモータ(16)が異常発熱を起
こし、それに伴って冷却ユニット(5)の圧縮機(1)
が異常停止したとき、前記冷却器(4)を、冷却ユニッ
ト(5)に対し、所定高さ上方に配置しているので、こ
のヘッド差より前記冷却器(4)の底部に接続した前記
出口側配管(33)から、前記冷却器(4)内に残る液
冷媒を下方に流すことができるし、しかも、前記圧縮機
(1)の異常停止時、前記制御回路(22)により前記
凝縮器(2)に付設したファン(21)を駆動させて前
記凝縮器(2)を冷却して、前記冷却ユニット(5)側
の冷媒圧力を低下させ、前記冷却器(4)内の圧力との
間に圧力差を増大させて、前記冷却ユニット(5)側へ
の戻りをより促進させているから、前記冷却器(4)内
の冷媒を前記冷却ユニット(5)に迅速に戻すことがで
きるのである。斯くすることにより異常高温状態となっ
た前記ビルトインモータ(16)によって前記冷却器(
4)の液冷媒が異常高圧となるのを回避でき、該冷却器
(4)が破損されるのを未然に防止することができるの
である。
(Effects of the Invention) As described above, in the present invention, the cooler (4) is replaced by a cooling unit (
The cooler (4) is placed above the cooler (4) at a predetermined height.
), the outlet side pipe (33) of the expansion mechanism (3) is connected to the bottom of the expansion mechanism (3), and a fan (21) is attached to air-cool the condenser (2). , Since the control circuit (22) for driving the fan (21) is provided, the built-in motor (16) generates abnormal heat, which causes the compressor (1) of the cooling unit (5) to
When the cooler (4) stops abnormally, since the cooler (4) is placed above the cooling unit (5) at a predetermined height, the outlet connected to the bottom of the cooler (4) due to this head difference. The liquid refrigerant remaining in the cooler (4) can flow downward from the side pipe (33), and when the compressor (1) stops abnormally, the control circuit (22) (2) is driven to cool the condenser (2), thereby lowering the refrigerant pressure on the cooling unit (5) side, and reducing the pressure within the cooler (4). Since the pressure difference between the refrigerant and the refrigerant is increased to further promote the return to the cooling unit (5), the refrigerant in the cooler (4) can be quickly returned to the cooling unit (5). It is. As a result, the built-in motor (16), which has reached an abnormally high temperature, causes the cooler (
It is possible to avoid the liquid refrigerant (4) from becoming abnormally high pressure, and it is possible to prevent the cooler (4) from being damaged.

また、前記膨張機構(3)の入口側と出口側との間に該
膨張機構(3)を側路するバイパス路(34)を設け、
該バイパス路(34)に圧縮機(1)の異常停止時にお
ける冷却器(4)から返流する液冷媒の流れのみを許す
逆止弁(35)を設けたから、前記冷却器(4)から前
記受液器(6)に流れる冷媒は、前記膨張機構(3)を
側路するバイパス路(34)を通って返流することがで
き、前記膨張機構(3)により抵抗を受けることなく、
より積極的に、かつ、迅速に前記冷却器(4)から前記
受液器(6)に溜め込むことができるのである。
Further, a bypass passage (34) for bypassing the expansion mechanism (3) is provided between the inlet side and the outlet side of the expansion mechanism (3),
Since the bypass passage (34) is provided with a check valve (35) that allows only the flow of liquid refrigerant flowing back from the cooler (4) when the compressor (1) stops abnormally, the flow from the cooler (4) to The refrigerant flowing into the liquid receiver (6) can flow back through the bypass passage (34) that bypasses the expansion mechanism (3), without being subjected to resistance by the expansion mechanism (3).
The liquid can be stored in the liquid receiver (6) from the cooler (4) more actively and quickly.

【図面の簡単な説明】[Brief explanation of drawings]

第1図は本発明冷却装置の配管系統図、第2図は本発明
冷却装置の冷却器の横断面図、第3図は従来例の配管系
統図である。 (1)・・・・圧縮機 (2)・・・・凝縮器 (21)・・・・ファン (22)・・・・制御回路 (3)・・・・膨張機構 (33)・・・・出口側配管 (34)・・・・バイパス路 (35)・・・・逆止弁 (4)・・・・冷却器 (6)・・・・冷却ユニット (θ)・・・・受液器 (16)・・・・ビルトインモータ 出願人  ダイキン工業株式会社 第2図
FIG. 1 is a piping system diagram of the cooling device of the present invention, FIG. 2 is a cross-sectional view of a cooler of the cooling device of the invention, and FIG. 3 is a piping system diagram of a conventional example. (1) Compressor (2) Condenser (21) Fan (22) Control circuit (3) Expansion mechanism (33)・Outlet side piping (34)...Bypass path (35)...Check valve (4)...Cooler (6)...Cooling unit (θ)...Liquid receiving Device (16)...Built-in motor Applicant Daikin Industries, Ltd. Figure 2

Claims (1)

【特許請求の範囲】 1)ビルトインモータ(18)に冷却器(4)を付設し
、該冷却器(4)を、圧縮機(1)、凝縮器(2)、受
液器(8)及び膨張機構(3)を備えた冷却ユニット(
5)における前記膨張機構(3)の出口側と圧縮機(1
)の吸入側との間に接続し、前記冷却器(4)を蒸発器
として前記ビルトインモータ(16)を冷却するように
した冷却装置において、前記冷却器(4)を、冷却ユニ
ット(5)に対し、所定高さ上方に配置して、前記冷却
器(4)の底部に前記膨張機構(3)の出口側配管(3
3)を接続すると共に、前記凝縮器(2)を空冷として
ファン(21)を付設する一方、前記圧縮機(1)の異
常停止時、前記ファン(21)を駆動する制御回路(2
2)を設けたことを特徴とするビルトインモータの冷却
装置。 2)膨張機構(3)の入口側と出口側との間に該膨張機
構(3)を側路するバイパス路(34)を設け、該バイ
パス路(34)に圧縮機(1)の異常停止時における冷
却器(4)から返流する液冷媒の流れのみを許す逆止弁
(35)を設けている請求項1記載のビルトインモータ
の冷却装置。
[Claims] 1) A cooler (4) is attached to the built-in motor (18), and the cooler (4) is connected to the compressor (1), the condenser (2), the liquid receiver (8), and the built-in motor (18). Cooling unit equipped with an expansion mechanism (3) (
5) between the outlet side of the expansion mechanism (3) and the compressor (1).
), the cooling device is configured to cool the built-in motor (16) by using the cooler (4) as an evaporator. The outlet side piping (3) of the expansion mechanism (3) is placed above the cooler (4) at a predetermined height.
3) is connected to the condenser (2), and a fan (21) is attached to air-cool the condenser (2), while a control circuit (2) that drives the fan (21) when the compressor (1) stops abnormally.
2) A built-in motor cooling device characterized by providing: 2) A bypass path (34) bypassing the expansion mechanism (3) is provided between the inlet side and the outlet side of the expansion mechanism (3), and the bypass path (34) is used to prevent abnormal stoppage of the compressor (1). 2. The built-in motor cooling device according to claim 1, further comprising a check valve (35) that allows only the flow of the liquid refrigerant flowing back from the cooler (4) at the time of the cooling.
JP14970090A 1990-06-07 1990-06-07 Cooling device for built-in motor Pending JPH0441153A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14970090A JPH0441153A (en) 1990-06-07 1990-06-07 Cooling device for built-in motor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14970090A JPH0441153A (en) 1990-06-07 1990-06-07 Cooling device for built-in motor

Publications (1)

Publication Number Publication Date
JPH0441153A true JPH0441153A (en) 1992-02-12

Family

ID=15480909

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14970090A Pending JPH0441153A (en) 1990-06-07 1990-06-07 Cooling device for built-in motor

Country Status (1)

Country Link
JP (1) JPH0441153A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009287570A (en) * 2009-09-07 2009-12-10 Mitsubishi Heavy Ind Ltd Boosting pump for low temperature fluid
US9682127B2 (en) 2005-02-03 2017-06-20 Intarcia Therapeutics, Inc. Osmotic delivery device comprising an insulinotropic peptide and uses thereof

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9682127B2 (en) 2005-02-03 2017-06-20 Intarcia Therapeutics, Inc. Osmotic delivery device comprising an insulinotropic peptide and uses thereof
JP2009287570A (en) * 2009-09-07 2009-12-10 Mitsubishi Heavy Ind Ltd Boosting pump for low temperature fluid

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