JP2536176B2 - Screw compressor - Google Patents

Screw compressor

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Publication number
JP2536176B2
JP2536176B2 JP1217087A JP21708789A JP2536176B2 JP 2536176 B2 JP2536176 B2 JP 2536176B2 JP 1217087 A JP1217087 A JP 1217087A JP 21708789 A JP21708789 A JP 21708789A JP 2536176 B2 JP2536176 B2 JP 2536176B2
Authority
JP
Japan
Prior art keywords
pressure
oil
oil supply
supply hole
passage
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
Application number
JP1217087A
Other languages
Japanese (ja)
Other versions
JPH0381591A (en
Inventor
典英 山口
修身 片岡
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 JP1217087A priority Critical patent/JP2536176B2/en
Publication of JPH0381591A publication Critical patent/JPH0381591A/en
Application granted granted Critical
Publication of JP2536176B2 publication Critical patent/JP2536176B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Description

【発明の詳細な説明】 (産業上の利用分野) 本発明は、スクリュー圧縮機、詳しくは、吐出側に連
通する油分離器から、スクリューロータに給油する給油
経路を備えたスクリュー圧縮機に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screw compressor, and more particularly to a screw compressor provided with an oil supply passage for supplying oil to a screw rotor from an oil separator communicating with a discharge side.

(従来の技術) 従来、吐出圧力を利用して油分離器からスクリューロ
ータに給油するようにしたスクリュー圧縮機は、例えば
実開昭55−170491号公報に示されている通りすでに知ら
れている。
(Prior Art) Conventionally, a screw compressor in which oil is discharged from an oil separator to a screw rotor by utilizing discharge pressure is already known as disclosed in, for example, Japanese Utility Model Publication No. 55-170491. .

この従来の圧縮機は、第5図に示したように、スクリ
ュー圧縮機(A)の吐出側に設けた油分離器(B)にて
吐出ガスから潤滑油を分離し、主配管(C)を介して、
圧縮機(A)の圧縮過程部に給油すると共に、吐出圧と
圧縮過程部における圧力との差圧がない起動時等におい
ては、バイパス給油配管(D)に介装した電磁弁(E)
をタイマー等により一定時間開くことにより、圧縮機
(A)の吸入側に潤滑油を給油できるようにしている。
尚、(F)はスクリュー圧縮機(A)を駆動するモータ
である。
In this conventional compressor, as shown in FIG. 5, an oil separator (B) provided on the discharge side of the screw compressor (A) separates the lubricating oil from the discharge gas, and the main pipe (C) is used. Through
The solenoid valve (E) installed in the bypass oil supply pipe (D) at the time of start-up when oil is supplied to the compression process part of the compressor (A) and there is no pressure difference between the discharge pressure and the pressure in the compression process part.
The lubricating oil can be supplied to the suction side of the compressor (A) by opening the valve for a certain time with a timer or the like.
Incidentally, (F) is a motor for driving the screw compressor (A).

(発明が解決しようとする課題) ところで、以上のごとく構成するスクリュー圧縮機で
は、主配管(C)とは別にバイパス給油配管(D)を設
けると共に、このバイパス給油配管(D)に前記電磁弁
(E)を介装しているから、給油配管が二系統となり複
雑になるし、又起動時のみに電磁弁(E)を作動させる
タイマー等の操作手段が必要となる問題があった。
(Problems to be Solved by the Invention) In the screw compressor configured as described above, the bypass oil supply pipe (D) is provided separately from the main pipe (C), and the solenoid valve is provided in the bypass oil supply pipe (D). Since (E) is interposed, the oil supply piping has two systems and becomes complicated, and there is a problem that an operating means such as a timer for activating the solenoid valve (E) only at the time of starting is required.

本発明は以上のような問題に鑑みてなしたもので、そ
の目的は、一系統の給油経路により起動時等吐出圧力が
低いときでも特に切換え操作することなく自動的に潤滑
油を給油できる圧縮機を提供する点にある。
The present invention has been made in view of the above problems, and an object thereof is to automatically supply lubricating oil without a switching operation even when the discharge pressure is low, such as at the time of starting, by a single oil supply passage. The point is to provide a machine.

(課題を解決するための手段) 上記目的を達成するために、本発明は、吐出側に連通
する油分離器(8)から、スクリューロータ(4)に給
油する給油経路(14)を備えたスクリュー圧縮機におい
て、該給油経路(14)が、前記油分離器(8)の油域に
連通する高圧通路(13)と、該高圧通路(13)が接続さ
れ、前記スクリューロータ(4)の圧縮過程部に連通す
る第1給油孔(15)及び該スクリューロータ(4)の吸
入側に連通する第2給油孔(16)をもった弁室(17)と
を有し、該弁室(17)内に摺動可能に弁体(18)を内装
して、前記弁室(17)における弁体(18)の摺動方向一
側に前記高圧通路(13)を連通させ、他側に、前記高圧
通路(13)から作用する吐出側圧力に対抗して前記弁体
(18)を押圧する押圧手段を設けて、前記弁体(18)の
摺動により前記高圧通路(13)を前記第1給油孔(15)
と第2給油孔(16)とに選択的に連通可能とすると共
に、吐出側圧力と吸入側圧力の差圧が小さいとき、前記
吐出側圧力による押圧力に打ち勝つ前記押圧手段による
押圧力で前記弁体(18)を摺動させ、前記第2給油孔
(16)を前記高圧通路(13)に連通して、該高圧通路
(13)の油を前記第2給油孔(16)を介して前記スクリ
ューロータ(4)の吸入側に給油し、また、前記吐出側
圧力と吸入側圧力の差圧が大きいとき、前記押圧手段に
よる押圧力に打ち勝つ前記吐出側圧力による押圧力で前
記弁体(18)を摺動させ、前記第1給油孔(15)を前記
高圧通路(13)に連通して、該高圧通路(13)の油を前
記第1給油孔(15)を介してスクリューロータ(4)の
圧縮過程部に給油するごとくしたものである。
(Means for Solving the Problems) In order to achieve the above object, the present invention includes an oil supply passage (14) for supplying oil from the oil separator (8) communicating with the discharge side to the screw rotor (4). In the screw compressor, the oil supply passage (14) is connected to a high pressure passage (13) communicating with the oil region of the oil separator (8), and the high pressure passage (13) is connected to the screw rotor (4). A valve chamber (17) having a first oil supply hole (15) communicating with the compression process portion and a second oil supply hole (16) communicating with the suction side of the screw rotor (4); A valve body (18) is slidably provided inside the valve chamber (17), and the high pressure passage (13) is connected to one side of the valve chamber (17) in the sliding direction of the valve body (18), and the other side is connected to the other side. , A pressing means for pressing the valve body (18) against the discharge side pressure acting from the high pressure passage (13) is provided, By sliding the high pressure passage (13) through the first oil supply hole (15)
And the second oil supply hole (16), and when the pressure difference between the discharge side pressure and the suction side pressure is small, the pressing force by the pressing means overcomes the pressing force by the discharge side pressure. The valve body (18) is slid to communicate the second oil supply hole (16) with the high pressure passage (13), and the oil in the high pressure passage (13) is passed through the second oil supply hole (16). When oil is supplied to the suction side of the screw rotor (4) and the pressure difference between the discharge side pressure and the suction side pressure is large, the valve element ( 18) is slid to communicate the first oil supply hole (15) with the high pressure passage (13), and the oil in the high pressure passage (13) is passed through the first oil supply hole (15) to a screw rotor (15). The oil is supplied to the compression process section 4).

(作用) 圧縮過程部の圧力より吐出側圧力が高くなる通常運転
時は、前記押圧手段による押圧力に、前記高圧通路(1
3)からの前記吐出側圧力による押圧力が打ち勝って前
記弁体(18)が摺動し、前記スクリューロータ(4)の
圧縮過程部に連通する前記第1給油孔(15)が前記高圧
通路(13)に連通して、該高圧通路(13)を介して油分
離器(8)の潤滑油を前記第1給油孔(15)からスクリ
ューロータ(4)の圧縮過程部に給油できる。
(Operation) During normal operation in which the pressure on the discharge side is higher than the pressure in the compression process section, the high pressure passage (1
The pressing force due to the discharge side pressure from 3) overcomes and the valve body (18) slides, and the first oil supply hole (15) communicating with the compression process portion of the screw rotor (4) has the high pressure passage. Lubricating oil in the oil separator (8) can be supplied to the compression process part of the screw rotor (4) from the first oil supply hole (15) through the high pressure passageway (13) in communication with the (13).

又、吐出側圧力が低い起動時には、前記吐出側圧力に
よる押圧力に、前記押圧手段による押圧力が打ち勝って
前記弁体(18)が摺動し、前記スクリューロータ(4)
の吸入側に連通する前記第2給油孔(16)が前記高圧通
路(13)に連通して、該高圧通路(13)を介して油分離
器(8)の潤滑油を前記第2給油孔(16)から前記スク
リューロータ(4)の吸入側に給油できる。
Further, when the discharge side pressure is low, the pressing force by the pressing means overcomes the pressing force by the discharge side pressure, and the valve body (18) slides, and the screw rotor (4)
The second oil supply hole (16) communicating with the suction side of the oil separator communicates with the high pressure passage (13), and the lubricating oil of the oil separator (8) is supplied to the second oil supply hole via the high pressure passage (13). Oil can be supplied from (16) to the suction side of the screw rotor (4).

(実施例) 第4図に示したスクリュー圧縮機(1)は、密閉構造
としたケーシング(2)の内部に、シャフト(3)を介
してスクリューロータ(4)を回転自由に支持すると共
に、このスクリューロータ(4)に設けるスクリュー溝
(4a)に一対のゲートロータ(図示せず)を噛合させ
て、前記スクリューロータ(4)の回転により、低圧な
吸入側から冷媒ガスを吸入して前記スクリュー溝(4a)
内で圧縮する一方、前記スクリューロータ(4)の外周
部位に対向する部位の前記ケーシング(2)には、負荷
率を変更するスライド弁(5)を移動自由に設けて、こ
のスライド弁(5)の移動操作で、前記ケーシング
(2)内で圧縮される冷媒ガスの一部を、バイパス路
(6)を介して低圧側にバイパスさせることにより、容
量制御を行うようにしている。
(Example) A screw compressor (1) shown in FIG. 4 supports a screw rotor (4) rotatably inside a casing (2) having a closed structure via a shaft (3), and A pair of gate rotors (not shown) are meshed with a screw groove (4a) provided in the screw rotor (4), and the rotation of the screw rotor (4) sucks a refrigerant gas from a low pressure suction side to Screw groove (4a)
A slide valve (5) for changing the load factor is provided movably on the casing (2) at a portion opposed to the outer peripheral portion of the screw rotor (4) while being compressed in the slide valve (5). In the moving operation of (1), a part of the refrigerant gas compressed in the casing (2) is bypassed to the low pressure side via the bypass passage (6) to perform the capacity control.

また、前記シャフト(3)上でスクリューロータ
(4)の側部に、複数の軸受(3a)を配置して前記シャ
フト(3)を回転自由に支持している。
A plurality of bearings (3a) are arranged on the side of the screw rotor (4) on the shaft (3) to rotatably support the shaft (3).

さらに、スクリュー圧縮機(1)のケーシング(2)
の側部には、高圧の圧縮冷媒ガスが吐出され、デミスタ
(7)(7)を内装した油分離器(8)を配設してい
る。
Furthermore, the casing (2) of the screw compressor (1)
A high-pressure compressed refrigerant gas is discharged to the side of the oil separator (8) in which the demisters (7) and (7) are installed.

また、前記スライド弁(5)の内部には、軸方向に延
びる高圧通路(13)を形成しており、前記ケーシング
(2)に、前記高圧通路(13)に連通可能に第1油孔
(9)を設け、前記ケーシング(2)の側部を閉鎖する
蓋体(10)に、前記第1油孔(9)に連通可能に周溝
(11)を形成し、さらに、前記ケーシング(2)の下部
内部に前記周溝(11)と連通し、かつ、油分離器(8)
の油溜に連通する第2油孔(12)を形成して、高圧通路
(13)、第1油孔(9)、周溝(11)、第2油孔(12)
等から給油経路(14)を構成し、この給油経路(14)を
介して、前記油分離器(8)内で前記デミスタ(7)
(7)により吐出ガスから分離した潤滑油を吐出圧力を
利用して前記スクリューロータ(4)の圧縮過程部に給
油するようにしている。
Further, a high pressure passage (13) extending in the axial direction is formed inside the slide valve (5), and the casing (2) is provided with a first oil hole (communicable with the high pressure passage (13). 9) is provided, and a peripheral groove (11) is formed in a lid (10) that closes a side portion of the casing (2) so as to be able to communicate with the first oil hole (9), and further, the casing (2). ) Communicating with the peripheral groove (11) inside the lower part of
A second oil hole (12) communicating with the oil reservoir of the high pressure passage (13), the first oil hole (9), the circumferential groove (11), the second oil hole (12).
And the like to form a refueling path (14), and through the refueling path (14), in the oil separator (8), the demister (7)
The lubricating oil separated from the discharge gas by (7) is supplied to the compression process portion of the screw rotor (4) by using the discharge pressure.

尚、(8a)は前記油分離器(8)の内部上方から下方
に垂直する隔壁、(8b)は複数の流入孔(8c)を設けた
吐出ガス収集管、(8d)はオイルフィルタである。
In addition, (8a) is a partition wall which extends vertically from above inside the oil separator (8), (8b) is a discharge gas collecting pipe having a plurality of inflow holes (8c), and (8d) is an oil filter. .

しかして、前記給油経路(14)における前記高圧通路
(13)に接続するようにスライド弁(5)内部に弁室
(17)を連続成形して、該弁室(17)を前記給油通路
(14)の一部と成すのであって、該弁室(17)は、前記
スクリューロータ(4)の圧縮過程部に連通する第1給
油孔(15)及び該スクリューロータ(4)の吸入側に連
通する第2給油孔(16)をもっており、該弁室(17)内
に摺動可能に弁体(18)を内装して、前記弁室(17)に
おける弁体(18)の摺動方向一側に前記高圧通路(13)
を連通させ、他側に、前記高圧通路(13)から作用する
吐出側圧力に対抗して前記弁体(18)を押圧する押圧手
段を設けて、前記弁体(18)の摺動により前記高圧通路
(13)を前記第1給油孔(15)と第2給油孔(16)とに
選択的に連通可能としている。
Then, a valve chamber (17) is continuously molded inside the slide valve (5) so as to be connected to the high pressure passage (13) in the oil supply passage (14), and the valve chamber (17) is formed in the oil supply passage (13). 14), and the valve chamber (17) is connected to the first oil supply hole (15) communicating with the compression process portion of the screw rotor (4) and the suction side of the screw rotor (4). A second oil supply hole (16) communicating with the valve body (18) is slidably provided in the valve chamber (17), and a sliding direction of the valve body (18) in the valve chamber (17). The high pressure passage on one side (13)
And a pressing means for pressing the valve body (18) against the pressure on the discharge side acting from the high pressure passage (13) on the other side. The high pressure passage (13) can be selectively communicated with the first oil supply hole (15) and the second oil supply hole (16).

そして、吐出側圧力と吸入側圧力の差圧が小さいと
き、前記吐出側圧力による押圧力に打ち勝つ前記押圧手
段による押圧力で前記弁体(18)を摺動させ、前記第2
給油孔(16)を前記高圧通路(13)に連通して、該高圧
通路(13)の油を前記第2給油孔(16)を介して前記ス
クリューロータ(4)の吸入側に給油し、また、前記吐
出側圧力と吸入側圧力の差圧が大きいとき、前記押圧手
段による押圧力に打ち勝つ前記吐出側圧力による押圧力
で前記弁体(18)を摺動させ、前記第1給油孔(15)を
前記高圧通路(13)に連通して、該高圧通路(13)の油
を前記第1給油孔(15)を介してスクリューロータ
(4)の圧縮過程部に給油するごとくしたのである。
When the pressure difference between the discharge side pressure and the suction side pressure is small, the valve body (18) is slid by the pressing force of the pressing means that overcomes the pressing force of the discharge side pressure,
An oil supply hole (16) communicates with the high pressure passage (13), and oil in the high pressure passage (13) is supplied to the suction side of the screw rotor (4) through the second oil supply hole (16); Further, when the pressure difference between the discharge side pressure and the suction side pressure is large, the valve body (18) is slid by the pressing force by the discharge side pressure that overcomes the pressing force by the pressing means, and the first oil supply hole ( 15) is communicated with the high pressure passage (13) so that oil in the high pressure passage (13) is supplied to the compression process portion of the screw rotor (4) through the first oil supply hole (15). .

具体的には、前記スライド弁(5)の内部に穿孔した
前記高圧通路(13)の一部を前記弁室(17)とするので
あり、第1図に示すように、この弁室(17)を前記スク
リューロータ(4)側に開口する第1給油孔(15)と、
この弁室(17)を前記スクリューロータ(4)の吸入側
に連通する第2給油孔(16)とを設けるのである。
Specifically, a part of the high pressure passage (13) perforated inside the slide valve (5) is used as the valve chamber (17). As shown in FIG. ) To the screw rotor (4) side, and a first oil supply hole (15),
The valve chamber (17) is provided with a second oil supply hole (16) communicating with the suction side of the screw rotor (4).

一方、前記スライド弁(5)の吸入側には、吸入側か
ら前記高圧通路(13)を閉鎖する調整ねじ(19)をねじ
込み、この調整ねじ(19)と前記弁体(18)との間には
バネ(20)を介装し、このバネ(20)を前記弁体(18)
に作用する吐出圧力に対抗して前記弁体(18)を押圧す
る押圧手段とするのである。そして、前記バネ(20)の
押圧力と吐出側圧力による押圧力との差により前記弁体
(18)を摺動可能にしている。
On the other hand, on the suction side of the slide valve (5), an adjusting screw (19) for closing the high pressure passage (13) is screwed in from the suction side, and between the adjusting screw (19) and the valve body (18). A spring (20) is inserted in the valve body (18).
This is a pressing means for pressing the valve body (18) against the discharge pressure acting on. The valve body (18) is slidable due to the difference between the pressing force of the spring (20) and the pressing force of the discharge side pressure.

又、縦断面をコの字状に形成した前記弁体(18)の周
壁には、第1連通孔(22)と第2連通孔(21)を形成
し、前記押圧手段による押圧力が前記吐出側圧力による
押圧力より大きくなるとき、前記弁体(18)が第1図に
示した位置に摺動し、第2連通孔(21)が前記第2給油
孔(16)と連通できるようにすると共に、前記吐出側圧
力による押圧力が前記押圧手段による押圧力より大きく
なるとき、前記弁体(18)が第2図に示した位置に摺動
して、第1連通孔(22)が前記弁室(17)の第1給油孔
(15)と連通できるようにしている。
Further, a first communication hole (22) and a second communication hole (21) are formed in the peripheral wall of the valve body (18) having a U-shaped vertical cross section, and the pressing force of the pressing means is the above-mentioned. When it becomes larger than the pressing force due to the discharge side pressure, the valve body (18) slides to the position shown in FIG. 1 so that the second communication hole (21) can communicate with the second oil supply hole (16). In addition, when the pressing force by the discharge side pressure becomes larger than the pressing force by the pressing means, the valve body (18) slides to the position shown in FIG. 2 and the first communication hole (22). Can communicate with the first oil supply hole (15) of the valve chamber (17).

即ち、吐出圧力をP1、吸入圧力をP3、スクリューロー
タ(4)の圧縮過程部における圧力をP2とすると、起動
時直後では、吐出圧力P1<圧縮過程部圧力P2であり、時
間の経過につれて吐出圧力P1と圧縮過程部圧力P2は共に
高くなるが、吐出圧力P1の方が圧縮過程部圧力P2より高
くなり一定時間後には吐出圧力P1>圧縮過程部圧力P2
なる。
That is, assuming that the discharge pressure is P 1 , the suction pressure is P 3 , and the pressure in the compression process portion of the screw rotor (4) is P 2 , immediately after startup, the discharge pressure P 1 <the compression process portion pressure P 2 , The discharge pressure P 1 and the compression process part pressure P 2 both increase with the passage of time, but the discharge pressure P 1 becomes higher than the compression process part pressure P 2 and after a certain time, the discharge pressure P 1 > the compression process part pressure Become P 2 .

一方、吸入圧力P3は常に吐出圧力P1及び圧縮過程部圧
力P2より低圧になっているのである。そこで、前記調整
ねじ(19)により前記バネ(20)の押圧力を調節して吐
出圧力P1<圧縮過程部圧力P2のとき、第2連通孔(21)
が前記第2給油孔(16)に連通するようにすると共に、
吐出圧力P1>圧縮過程部圧力P2のとき、第1連通孔(2
2)が第1給油孔(15)と連通するようにするのであ
る。
On the other hand, the suction pressure P 3 is always lower than the discharge pressure P 1 and the compression process portion pressure P 2 . Therefore, when the pressing force of the spring (20) is adjusted by the adjusting screw (19) and the discharge pressure P 1 <the compression process portion pressure P 2 , the second communication hole (21)
To communicate with the second oil supply hole (16),
When the discharge pressure P 1 > the compression process pressure P 2 , the first communication hole (2
2) communicates with the first oil supply hole (15).

尚、前記第1連通孔(22)は前記弁室(17)の長さ方
向に長く形成して、前記弁体(18)の移動により第2連
通孔(21)と第2給油孔(16)との連通が遮断されたと
き、直ちに第1連通孔(22)が前記第1給油孔(15)と
連通できるようにしている。
The first communication hole (22) is formed long in the length direction of the valve chamber (17), and the second communication hole (21) and the second oil supply hole (16) are formed by the movement of the valve body (18). ), The first communication hole (22) can immediately communicate with the first oil supply hole (15).

又、(23)は前記バネ(20)を設けた前記弁体(18)
の背面側室を吸入側に連通させる逃がし孔である。
Further, (23) is the valve body (18) provided with the spring (20).
Is a relief hole that communicates the back side chamber of the chamber with the suction side.

斯くして、起動時等吐出側圧力P1と吸入側圧力P3の差
圧が小さくて、しかも吐出圧力P1が圧縮過程部の圧力P2
より低いとき、第1図に示すように、第2連通孔(21)
と第2給油孔(16)とが連通すると共に、第1連通孔
(22)は弁室(17)の壁で閉鎖されて、第2給油孔(1
6)のみが前記高圧通路(13)に連通するから、前記高
圧通路(13)の潤滑油を第2給油孔(16)を介して前記
スクリューロータ(4)の吸入側に給油できるし、又前
記第1連通孔(22)が閉鎖されているから、前記高圧通
路(13)には逆圧は作用しないのである。
Thus, the pressure difference between the discharge side pressure P 1 and the suction side pressure P 3 at the time of start-up is small, and the discharge pressure P 1 is the pressure P 2 of the compression process portion.
When lower, as shown in FIG. 1, the second communication hole (21)
And the second oil supply hole (16) communicate with each other, the first communication hole (22) is closed by the wall of the valve chamber (17), and the second oil supply hole (1)
Since only 6) communicates with the high pressure passage (13), the lubricating oil in the high pressure passage (13) can be supplied to the suction side of the screw rotor (4) through the second oil supply hole (16). Since the first communication hole (22) is closed, the back pressure does not act on the high pressure passage (13).

一方、安定運転状態においては、吐出側圧力P1と吸入
側圧力P3との差圧が大きく、しかも吐出圧力P1が圧縮過
程部の圧力P2より高圧であるから、第2図に示すよう
に、前記弁体(18)は前記バネ(20)の押圧力に抗して
第1図左方に移動し、第2図に示した位置に位置するこ
とになり、前記第1連通孔(22)と第2給油孔(15)と
が連通すると共に、第2連通孔(21)は弁室(17)の壁
で閉鎖され、第1給油孔(15)のみが前記高圧通路(1
3)に連通することになり、吐出圧力P1と圧縮過程部の
圧力P2との差圧により前記高圧通路(13)の潤滑油を第
1給油孔(15)を介して前記スクリューロータ(4)の
圧縮過程部に給油できる。
On the other hand, in the stable operation state, the pressure difference between the discharge side pressure P 1 and the suction side pressure P 3 is large, and the discharge pressure P 1 is higher than the pressure P 2 in the compression process portion, so that it is shown in FIG. As described above, the valve body (18) moves to the left in FIG. 1 against the pressing force of the spring (20) and is positioned at the position shown in FIG. (22) communicates with the second oil supply hole (15), the second communication hole (21) is closed by the wall of the valve chamber (17), and only the first oil supply hole (15) has the high pressure passage (1).
3), the lubricating oil in the high pressure passage (13) is transferred to the screw rotor (15) through the first oil supply hole (15) due to the differential pressure between the discharge pressure P 1 and the pressure P 2 in the compression process portion. Oil can be supplied to the compression process part of 4).

つまり、通常運転時においては前記第1給油孔(15)
を介して前記スクリューロータ(4)圧縮過程部に給油
できながら、起動時等吐出側圧力P1と圧縮過程部P2の差
圧が小さくて、しかも吐出側圧力P1が圧縮過程部圧力P2
より低圧になり、吐出側圧力P1と圧縮過程部圧力P2との
差圧により、スクリューロータ(4)の圧縮過程部に給
油できないときでも、前記第2給油孔(16)を介して前
記高圧通路(13)の潤滑油を前記スクリューロータ
(4)の吸入側に給油できるのである。
That is, during normal operation, the first oil supply hole (15)
While the oil can be supplied to the compression process part of the screw rotor (4) via the, the pressure difference between the discharge side pressure P 1 and the compression process part P 2 at the time of starting is small, and the discharge side pressure P 1 is equal to the compression process part pressure P. 2
Even when the compression process part of the screw rotor (4) cannot be refueled due to the lower pressure and the pressure difference between the discharge side pressure P 1 and the compression process part pressure P 2, it is possible to use the second oil supply hole (16) to The lubricating oil in the high pressure passage (13) can be supplied to the suction side of the screw rotor (4).

従って、一系統の給油経路(14)で起動時等吐出圧力
が低いときでも特に切換え操作することなく、自動的に
潤滑油を給油でき、潤滑不足に起因する軸受の損傷を受
けることなく、圧縮機(1)の信頼性を向上できる。ま
た、給油経路(14)が一系統であるから給油配管が簡単
になる。
Therefore, even if the discharge pressure is low, such as at start-up, the lubrication oil can be automatically replenished through the single system lubrication path (14) without any switching operation, and the bearing is not damaged due to insufficient lubrication and the compression is prevented. The reliability of the machine (1) can be improved. Further, since the oil supply route (14) is one system, the oil supply pipe becomes simple.

以上の実施例においては、前記高圧通路(13)を閉鎖
するねじ体(19)と前記弁体(18)との間にバネ(20)
を介装して、このバネ(20)を前記高圧通路(13)から
作用する吐出圧力に対抗して前記弁体(18)を押圧する
押圧手段としたが、第3図に示したように、前記弁体
(18)の背面側を前記第1給油孔(15)に連通する制御
孔(24)を設けてもよく、この場合には前記弁体(18)
の第1図右方への移動を制限するストッパー(25)を適
当な位置に設けて、圧縮過程部圧力P2が吐出側圧力P1
り高圧のとき、前記第2連通孔(22)と第2給油孔(1
6)とが連通するように前記弁体(18)の移動を制限す
るのである。尚、この場合には、前記逃がし孔(23)を
設けないのである。
In the above embodiments, the spring (20) is provided between the screw body (19) closing the high pressure passage (13) and the valve body (18).
The spring (20) is used as a pressing means for pressing the valve body (18) against the discharge pressure acting from the high pressure passageway (13), as shown in FIG. A control hole (24) for communicating the back side of the valve body (18) with the first oil supply hole (15) may be provided. In this case, the valve body (18)
1. A stopper (25) for restricting the rightward movement of FIG. 1 is provided at an appropriate position so that when the compression process pressure P 2 is higher than the discharge side pressure P 1 , the second communication hole (22) 2nd oil supply hole (1
The movement of the valve body (18) is restricted so that it can communicate with 6). In this case, the escape hole (23) is not provided.

従って、前記制御孔(24)を設けるときには、前記バ
ネ(20)を設ける必要がなく、従ってこのバネ(20)の
押圧力を調整する手間も不要になるのである。
Therefore, when the control hole (24) is provided, it is not necessary to provide the spring (20), and therefore the labor for adjusting the pressing force of the spring (20) is not necessary.

又、以上説明したように、容量制御を行うスライド弁
(5)に前記弁室(17)を設けるのが好ましいが、前記
ケーシング(2)に設けてもよい。
Further, as described above, it is preferable to provide the valve chamber (17) in the slide valve (5) for controlling the capacity, but it may be provided in the casing (2).

(発明の効果) 以上のごとく、本発明によれば、吐出側に連通する油
分離器(8)から、スクリューロータ(4)に給油する
給油経路(14)を備えたスクリュー圧縮機において、該
給油経路(14)が、前記油分離器(8)の油域に連通す
る高圧通路(13)と、該高圧通路(13)が接続され、前
記スクリューロータ(4)の圧縮過程部に連通する第1
給油孔(15)及び該スクリューロータ(4)の吸入側に
連通する第2給油孔(16)をもった弁室(17)とを有
し、該弁室(17)内に摺動可能に弁体(18)を内装し
て、前記弁室(17)における弁体(18)の摺動方向一側
に前記高圧通路(13)を連通させ、他側に、前記高圧通
路(13)から作用する吐出側圧力に対抗して前記弁体
(18)を押圧する押圧手段を設けて、前記弁体(18)の
摺動により前記高圧通路(13)を前記第1給油孔(15)
と第2給油孔(16)とに選択的に連通可能とすると共
に、吐出側圧力と吸入側圧力の差圧が小さいとき、前記
吐出側圧力による押圧力に打ち勝つ前記押圧手段による
押圧力で前記弁体(18)を摺動させ、前記第2給油孔
(16)を前記高圧通路(13)に連通して、該高圧通路
(13)の油を前記第2給油孔(16)を介して前記スクリ
ューロータ(4)の吸入側に給油し、また、前記吐出側
圧力と吸入側圧力の差圧が大きいとき、前記押圧手段に
よる押圧力に打ち勝つ前記吐出側圧力による押圧力で前
記弁体(18)を摺動させ、前記第1給油孔(15)を前記
高圧通路(13)に連通して、該高圧通路(13)の油を前
記第1給油孔(15)を介してスクリューロータ(4)の
圧縮過程部に給油するごとくしたから、圧縮過程部の圧
力より吐出側圧力が高くなる通常運転時は、前記押圧手
段による押圧力に、前記高圧通路(13)からの前記吐出
側圧力による押圧力が打ち勝って前記弁体(18)が摺動
し、前記スクリューロータ(4)の圧縮過程部に連通す
る前記第1給油孔(15)が前記高圧通路(13)に連通し
て、該高圧通路(13)を介して油分離器(8)の潤滑油
を前記第1給油孔(15)からスクリューロータ(4)の
圧縮過程部に給油できる。
(Effects of the Invention) As described above, according to the present invention, in the screw compressor including the oil supply passage (14) for supplying oil to the screw rotor (4) from the oil separator (8) communicating with the discharge side, The oil supply path (14) is connected to the high pressure passage (13) communicating with the oil region of the oil separator (8) and the high pressure passage (13), and communicates with the compression process portion of the screw rotor (4). First
A valve chamber (17) having an oil supply hole (15) and a second oil supply hole (16) communicating with the suction side of the screw rotor (4), and slidable in the valve chamber (17). The valve body (18) is installed so that the high pressure passage (13) communicates with one side of the valve chamber (17) in the sliding direction of the valve body (18), and the other side has the high pressure passage (13) from the high pressure passage (13). A pressing means for pressing the valve body (18) against the acting discharge side pressure is provided, and the high pressure passage (13) is moved through the first oil supply hole (15) by sliding of the valve body (18).
And the second oil supply hole (16), and when the pressure difference between the discharge side pressure and the suction side pressure is small, the pressing force by the pressing means overcomes the pressing force by the discharge side pressure. The valve body (18) is slid to communicate the second oil supply hole (16) with the high pressure passage (13), and the oil in the high pressure passage (13) is passed through the second oil supply hole (16). When oil is supplied to the suction side of the screw rotor (4) and the pressure difference between the discharge side pressure and the suction side pressure is large, the valve element ( 18) is slid to communicate the first oil supply hole (15) with the high pressure passage (13), and the oil in the high pressure passage (13) is passed through the first oil supply hole (15) to a screw rotor (15). Since the oil is supplied to the compression process part in 4), the pressure on the discharge side is usually higher than the pressure in the compression process part. During operation, the pressing force of the discharge side pressure from the high pressure passage (13) overcomes the pressing force of the pressing means, and the valve body (18) slides to compress the screw rotor (4). The first oil supply hole (15) communicating with the section communicates with the high pressure passage (13), and the lubricating oil of the oil separator (8) is supplied to the first oil supply hole (15) through the high pressure passage (13). ) Can be supplied to the compression process part of the screw rotor (4).

又、吐出側圧力が低い起動時には、前記吐出側圧力に
よる押圧力に、前記押圧力手段による押圧力が打ち勝っ
て前記弁体(18)が摺動し、前記スクリューロータ
(4)の吸入側に連通する前記第2給油孔(16)が前記
高圧通路(13)に連通して、該高圧通路(13)を介して
油分離器(8)の潤滑油を前記第2給油孔(16)から前
記スクリューロータ(4)の吸入側に給油できる。
When the discharge side pressure is low, the pressing force of the discharge side pressure overcomes the pressing force of the discharge side pressure, and the valve body (18) slides to the suction side of the screw rotor (4). The communicating second oil supply hole (16) communicates with the high pressure passage (13), and the lubricating oil of the oil separator (8) is passed from the second oil supply hole (16) through the high pressure passage (13). Oil can be supplied to the suction side of the screw rotor (4).

従って、一系統の給油経路で起動時等吐出圧力が低い
ときでも特に切換え操作することなく、自動的に潤滑油
を給油でき、潤滑不足に起因する軸受の損傷を受けな
く、圧縮機の信頼性を向上できるし、また、給油経路が
一系統であるから、給油配管も簡単になる。
Therefore, even if the discharge pressure is low, such as at start-up, the lubrication oil can be automatically replenished automatically in one system of the lubrication path without damage, and the bearing is not damaged due to insufficient lubrication. In addition, since the oil supply route is one system, the oil supply pipe becomes simple.

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

第1図は、起動時における本発明の要部概略説明図、第
2図は通常運転時における本発明の要部概略説明図、第
3図は他の実施例を示す要部概略説明図、第4図はスク
リュー圧縮機の要部構造部分縦断図、第5図は従来例を
示す概略配管図である。 (1)……スクリュー圧縮機 (4)……スクリューロータ (8)……油分離器 (13)……高圧通路 (14)……給油経路 (15)……第1給油孔 (16)……第2給油孔 (17)……弁室 (18)……弁体
FIG. 1 is a schematic explanatory view of a main part of the present invention at startup, FIG. 2 is a schematic explanatory view of a main part of the present invention during normal operation, and FIG. 3 is a schematic explanatory view of a main part of another embodiment. FIG. 4 is a vertical cross-sectional view of the structure of the main part of the screw compressor, and FIG. 5 is a schematic piping diagram showing a conventional example. (1) ...... Screw compressor (4) ...... Screw rotor (8) ...... Oil separator (13) ...... High pressure passage (14) ...... Oil supply path (15) ...... First oil supply hole (16) ... … Second oil supply hole (17) …… Valve chamber (18) …… Valve disc

Claims (1)

(57)【特許請求の範囲】(57) [Claims] 【請求項1】吐出側に連通する油分離器(8)から、ス
クリューロータ(4)に給油する給油経路(14)を備え
たスクリュー圧縮機において、 該給油経路(14)が、前記油分離器(8)の油域に連通
する高圧通路(13)と、該高圧通路(13)が接続され、
前記スクリューロータ(4)の圧縮過程部に連通する第
1給油孔(15)及び該スクリューロータ(4)の吸入側
に連通する第2給油孔(16)をもった弁室(17)とを有
し、 該弁室(17)内に摺動可能に弁体(18)を内装して、前
記弁室(17)における弁体(18)の摺動方向一側に前記
高圧通路(13)を連通させ、他側に、前記高圧通路(1
3)から作用する吐出側圧力に対抗して前記弁体(18)
を押圧する押圧手段を設けて、前記弁体(18)の摺動に
より前記高圧通路(13)を前記第1給油孔(15)と第2
給油孔(16)とに選択的に連通可能とすると共に、 吐出側圧力と吸入側圧力の差圧が小さいとき、前記吐出
側圧力による押圧力に打ち勝つ前記押圧手段による押圧
力で前記弁体(18)を摺動させ、前記第2給油孔(16)
を前記高圧通路(13)に連通して、該高圧通路(13)の
油を前記第2給油孔(16)を介して前記スクリューロー
タ(4)の吸入側に給油し、また、前記吐出側圧力と吸
入側圧力の差圧が大きいとき、前記押圧手段による押圧
力に打ち勝つ前記吐出側圧力による押圧力で前記弁体
(18)を摺動させ、前記第1給油孔(15)を前記高圧通
路(13)に連通して、該高圧通路(13)の油を前記第1
給油孔(15)を介してスクリューロータ(4)の圧縮過
程部に給油するごとくしたことを特徴とするスクリュー
圧縮機。
1. A screw compressor having an oil supply passage (14) for supplying oil to a screw rotor (4) from an oil separator (8) communicating with the discharge side, wherein the oil supply passage (14) is the oil separation A high pressure passage (13) communicating with the oil region of the vessel (8) and the high pressure passage (13) are connected,
A valve chamber (17) having a first oil supply hole (15) communicating with the compression process portion of the screw rotor (4) and a second oil supply hole (16) communicating with the suction side of the screw rotor (4); A valve body (18) is slidably provided in the valve chamber (17), and the high pressure passage (13) is provided at one side of the valve chamber (17) in the sliding direction of the valve body (18). The high pressure passage (1
The valve body (18) against the discharge side pressure acting from 3)
Is provided to press the high pressure passage (13) with the first oil supply hole (15) and the second oil supply hole (15) by sliding the valve body (18).
When the pressure difference between the discharge side pressure and the suction side pressure is small, the valve body (16) can be selectively communicated with the oil supply hole (16), and the valve element ( 18) slide to make the second oil supply hole (16)
To communicate with the high pressure passage (13) to supply oil in the high pressure passage (13) to the suction side of the screw rotor (4) through the second oil supply hole (16), and also to the discharge side. When the pressure difference between the pressure and the suction side pressure is large, the valve body (18) is slid by the pressure force of the discharge side pressure that overcomes the pressure force of the pressing means, and the first oil supply hole (15) is set to the high pressure. The oil in the high-pressure passage (13) communicates with the passage (13) and is transferred to the first
A screw compressor, wherein oil is supplied to a compression process portion of a screw rotor (4) through an oil supply hole (15).
JP1217087A 1989-08-23 1989-08-23 Screw compressor Expired - Fee Related JP2536176B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1217087A JP2536176B2 (en) 1989-08-23 1989-08-23 Screw compressor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1217087A JP2536176B2 (en) 1989-08-23 1989-08-23 Screw compressor

Publications (2)

Publication Number Publication Date
JPH0381591A JPH0381591A (en) 1991-04-05
JP2536176B2 true JP2536176B2 (en) 1996-09-18

Family

ID=16698631

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1217087A Expired - Fee Related JP2536176B2 (en) 1989-08-23 1989-08-23 Screw compressor

Country Status (1)

Country Link
JP (1) JP2536176B2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010106787A1 (en) 2009-03-16 2010-09-23 ダイキン工業株式会社 Screw compressor

Also Published As

Publication number Publication date
JPH0381591A (en) 1991-04-05

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