JPH02248684A - Capacity control device for screw type two-stage compressor - Google Patents
Capacity control device for screw type two-stage compressorInfo
- Publication number
- JPH02248684A JPH02248684A JP6905889A JP6905889A JPH02248684A JP H02248684 A JPH02248684 A JP H02248684A JP 6905889 A JP6905889 A JP 6905889A JP 6905889 A JP6905889 A JP 6905889A JP H02248684 A JPH02248684 A JP H02248684A
- Authority
- JP
- Japan
- Prior art keywords
- stage compressor
- pressure
- low
- slide valve
- control
- 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
- 239000003507 refrigerant Substances 0.000 description 3
- 238000013459 approach Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
- F04C28/10—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids characterised by changing the positions of the inlet or outlet openings with respect to the working chamber
- F04C28/12—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids characterised by changing the positions of the inlet or outlet openings with respect to the working chamber using sliding valves
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Applications Or Details Of Rotary Compressors (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、スクリュー形２段圧縮機の容量制御装置、詳
しくは、低段圧縮機と高段圧縮機とを備えたスクリュー
形２段圧縮機の容量制御装置に関する。Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a capacity control device for a screw type two-stage compressor, and more specifically, a screw type two-stage compressor equipped with a low-stage compressor and a high-stage compressor. The present invention relates to a capacity control device for a machine.
（従来の技術）
従来、スライド弁を用いてスクリュー圧縮機の容量側御
をおこなうようにしたものは、例えば特公昭５２−２１
２４号公報に示されている通り、すでに知られ−でいる
。(Prior art) Conventionally, a slide valve was used to control the capacity of a screw compressor, for example, in
As shown in Japanese Patent No. 24, this is already known.
この従来の技術は、第３図に示したように、スクリュー
圧縮機（Ａ）にスライド弁ＣＢ’）を内装する七共に、
該スライド弁（Ｂ）のスライド方向高圧側に、ピストン
（Ｃ）を内装したシリンダ（Ｄ）を設けて、前記スライ
ド弁（Ｂ）を前記ピストン（Ｃ）にスピンドル（Ｅ）を
介して連結する一方、油タンク（図示しない）からの高
圧（ＨＰ）の油を前記シリンダ（Ｄ）の油圧シリンダ室
（Ｇ）に導入する油圧通路（Ｈ）を設ける一方、前記シ
リンダ（Ｄ）の壁面に、前記油圧通路（Ｈ）の孔より大
径とした複数のバランス孔（１）（Ｊ）（Ｋ）（Ｌ）を
貫通させて、これら各バランス孔（１）・・・の他端を
自動弁（Ｍ）（Ｎ）（０）（Ｐ）を介して低圧側に接続
すると共に、前記シリンダ（Ｄ）の低圧室（Ｒ）を低圧
（ＬＰ）側に連通させるバランス通路（Ｓ）を設け、全
自動弁（Ｍ）・・・の開操作により、例えば自動弁（Ｍ
）を開操作することに１００％負荷運転を又、自動弁（
Ｎ）を開操作することに８０％負荷運転をするように前
記ピストン（Ｃ）に連結した前記スライド弁（Ｂ）の位
置を調節し、容量制御運転を可能にしている。As shown in Fig. 3, this conventional technology has a screw compressor (A) equipped with a slide valve CB').
A cylinder (D) containing a piston (C) is provided on the high pressure side in the sliding direction of the slide valve (B), and the slide valve (B) is connected to the piston (C) via a spindle (E). On the other hand, a hydraulic passage (H) is provided for introducing high pressure (HP) oil from an oil tank (not shown) into the hydraulic cylinder chamber (G) of the cylinder (D), and on the wall surface of the cylinder (D), A plurality of balance holes (1) (J) (K) (L) having a diameter larger than the hole of the hydraulic passage (H) are passed through, and the other end of each balance hole (1) is connected to an automatic valve. (M) (N) (0) A balance passage (S) is provided which connects to the low pressure side via (P) and communicates the low pressure chamber (R) of the cylinder (D) with the low pressure (LP) side; For example, by opening the fully automatic valve (M)...
), 100% load operation is possible by opening the automatic valve (
The position of the slide valve (B) connected to the piston (C) is adjusted so that 80% load operation is performed when the valve N) is opened, thereby enabling capacity control operation.
（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従来の容量制御装置を
、低段圧縮機と高段圧縮機とを備えたスクリュー形２段
圧縮機における低段圧縮機の容量側ｏＩ装置に使用する
場合、低段圧縮機の高圧側の圧力即ち中間圧（ＭＰ）を
利用する場合、２段圧縮機においては、容量制御運転時
において、低段圧縮機の高圧側圧カ即ち中間圧（ＭＰ）
と低圧（ＬＰ）との差圧が少なくなることがあり、この
ようなときには前記スライド弁（Ｂ）が作動しなくなる
問題が生じるのである。(Problem to be Solved by the Invention) By the way, the conventional capacity control device configured as described above is applied to the capacity side of the low-stage compressor in a screw type two-stage compressor equipped with a low-stage compressor and a high-stage compressor. When used in an oI device, when the pressure on the high pressure side of the low stage compressor, that is, the intermediate pressure (MP) is used, in the case of a two stage compressor, during capacity control operation, the high pressure side pressure, that is, the intermediate pressure Pressure (MP)
The differential pressure between the low pressure (LP) and the low pressure (LP) may become small, and in such a case, the problem arises that the slide valve (B) does not operate.
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、低段圧縮機と高段圧縮機とを備えたスクリュー
形２段圧縮機において、低差圧時においても低段側圧縮
機の容量制御における作動不良を招くことのない容量制
御装置を安価に提供する点である。The present invention has been made in view of the above-mentioned problems, and its purpose is to provide a screw type two-stage compressor equipped with a low-stage compressor and a high-stage compressor. The object of the present invention is to provide a capacity control device at a low cost that does not cause malfunction in capacity control of a compressor.
（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、低段圧縮機（１
）と高段圧縮機（２）とを備えたスクリュー形２段圧縮
機の容量制御装置であって、前記低段圧縮機（１）にス
ライド弁（３）を設け、このスライド弁（３）にロブド
（４）を介して連結したピストン（５）をシリンダ室（
６）に配設し、前記ピストン（５）の作動で前記スライ
ド弁（３）を移動させて、前記低段圧縮機（１）の容量
制御を行なう一方、前記ピストン（５）で区画する２室
のうち、前記スライド弁（３）をロードアップ側に制御
する第１制御室（１０）に、前記スライド弁（３）の移
動方向に沿って複数の容量制御孔（１２）（１３）を開
口して、これら各容量制御孔（１２）（１３）を開閉弁
（１４）（１５）を介して前記高段圧縮機（２）の低圧
側に連通ずると共に、前記スライド弁（３）をロードダ
ウン側に制御する第２制御室（１１）を、前記高段圧縮
機（２）の高圧側に連通し、かつ、前記第１及び第２制
御室（１０）（１２）を絞り（１６）を介して連通した
のである。(Means for Solving the Problems) In order to achieve the above object, the present invention provides a low stage compressor (1
) and a high-stage compressor (2), the low-stage compressor (1) is provided with a slide valve (3), and the slide valve (3) The piston (5) connected to the cylinder chamber (
6), and the slide valve (3) is moved by the operation of the piston (5) to control the capacity of the low stage compressor (1). Among the chambers, a plurality of capacity control holes (12) and (13) are provided in a first control chamber (10) for controlling the slide valve (3) to the load-up side along the moving direction of the slide valve (3). The capacity control holes (12) and (13) are opened and communicated with the low pressure side of the high stage compressor (2) via the on-off valves (14) and (15), and the slide valve (3) is opened. A second control chamber (11) for controlling the load down side is communicated with the high pressure side of the high stage compressor (2), and the first and second control chambers (10) and (12) are throttled (16 ).
（作用）
第２制御室（１２）に高段圧縮機（２）の吐出側の高圧
を常に作用させる一方、開閉弁（１４）（１５）の開閉
操作により第１？Ｃ１１御室（１０）を前記高段圧縮機
（２）の低圧側に連通したり、連通を遮断したりして、
前記ピストン（５）を作動させ、該ピストン（５）の作
動により前記スライド弁（３）を移動させ、容量制御す
ることができ、容量制御運転時、前記低段圧縮機（１）
の吐出側の圧力が低下して該圧縮機（１）の低圧側圧力
に近づいても、該圧縮機（１）に設けたスライド弁（３
）を移動させる前記ピストン（５）を作動させるに必要
な差圧を１りることができるのである。(Function) While the high pressure on the discharge side of the high-stage compressor (2) is always applied to the second control chamber (12), the first control chamber (12) is operated to open and close the on-off valves (14) and (15). Connecting the C11 chamber (10) to the low pressure side of the high stage compressor (2) or cutting off the communication,
The piston (5) is operated, and the slide valve (3) is moved by the operation of the piston (5) to control the capacity. During the capacity control operation, the low stage compressor (1)
Even if the pressure on the discharge side of the compressor (1) decreases and approaches the low pressure side pressure of the compressor (1), the slide valve (3
), the differential pressure required to operate the piston (5) that moves the piston (5) can be reduced by 1.
（実施例） 本発明の一実施例を第１図に基づいて説明する。(Example) An embodiment of the present invention will be described based on FIG.
第１図は冷凍装置に用いるスクリュー形２段圧縮機の容
量制御装置を模式的に示した概略説明図であって、低段
圧縮機（１）で圧縮した冷媒を高段圧縮機（２）の吸入
側に供給し、高段圧縮機（２）において更に圧縮するの
である。つまり、前記低段圧縮機（１）の吸入側から吸
入する低圧（ＬＰ）の冷媒を一旦低段圧縮機（１）によ
り中間圧（ＭＰ）にし、中間圧（ＭＰ）とした冷媒を更
に高段圧縮機（２）により圧縮して高圧（ＨＰ）にする
ものである。FIG. 1 is a schematic explanatory diagram schematically showing a capacity control device for a screw type two-stage compressor used in a refrigeration system, in which refrigerant compressed in a low-stage compressor (1) is transferred to a high-stage compressor (2). It is supplied to the suction side of the compressor and further compressed in the high stage compressor (2). In other words, the low-pressure (LP) refrigerant sucked from the suction side of the low-stage compressor (1) is once brought to intermediate pressure (MP) by the low-stage compressor (1), and the refrigerant at intermediate pressure (MP) is further raised to an intermediate pressure (MP). It is compressed to high pressure (HP) by a stage compressor (2).
前記低段圧縮機（１）には、一端を吐出側の中間圧（Ｍ
Ｐ）に、他端を吸入側の低圧（ＬＰ）にさらすごとくス
ライド弁（３）を設ける一方、このスライド弁（３）に
は、ロッＦ（４）を介しテヒストン（５）を連結すると
共に、このピストン（５）を、前記スライド弁（４）の
スライド方向−側に設けたシリンダ室（６）に配設し、
前記ピストン（５）を後記する油圧により作動させ、該
ピストン（５）の作動により、前記スライド弁（３）を
移動させ、該スライド弁（３）の移動により中間圧（Ｍ
Ｐ）側を低圧（ＬＰ）側に連通する容量制御通路（図示
しない）の開度を調節することにより、前記低段圧縮機
（１）の容量制御を１テなうようにしている。The low stage compressor (1) has one end connected to an intermediate pressure (M
P) is provided with a slide valve (3) so as to expose the other end to the low pressure (LP) on the suction side, and a techstone (5) is connected to this slide valve (3) via a lock F (4). , the piston (5) is disposed in a cylinder chamber (6) provided on the negative side of the sliding direction of the slide valve (4),
The piston (5) is actuated by hydraulic pressure, which will be described later, and the slide valve (3) is moved by the actuation of the piston (5), and the intermediate pressure (M
The capacity of the low stage compressor (1) is controlled by adjusting the opening degree of a capacity control passage (not shown) that communicates the P) side with the low pressure (LP) side.
又一方、高段圧縮機（２）にも、一端を吐出側の高圧（
ＨＰ）に、他端を吸入側の中間圧（ＭＰ）にさらすごと
くスライド弁（７）を設け、前記低段圧縮機（１）と同
様に、前記スライド弁（７）のスライド方向−側に設け
たシリンダ室（８）に配設したピストン（８）を後記す
る油圧により作動させ、該ピストン（９）の作動により
前記スライド弁（７）をスライドさせて、該スライド弁
（７）の移動により高圧（ＨＰ）４１１１を中間圧（Ｍ
Ｐ）側に連通ずる容量制御通路（図示しない）の開度を
調節するようにしている。On the other hand, the high-stage compressor (2) also has one end connected to the high pressure (
HP) is provided with a slide valve (7) such that the other end is exposed to intermediate pressure (MP) on the suction side, and similarly to the low stage compressor (1), a slide valve (7) is provided on the - side in the sliding direction of the slide valve (7). A piston (8) disposed in a provided cylinder chamber (8) is actuated by the hydraulic pressure described later, and the slide valve (7) is slid by the operation of the piston (9), and the slide valve (7) is moved. Converts high pressure (HP) 4111 to intermediate pressure (M
The opening degree of a capacity control passage (not shown) communicating with the P) side is adjusted.
更に、前記低段圧縮機（１）のシリンダ室（６）を前記
ピストン（５）で区画して２室を形成し、この２室のう
ち、前記スライド弁（３）をロードアップ側に制御する
第１制御室（ｌＯ）に、前記スライド弁（３）の移動方
向に沿って二つの容量制御孔（１２）（１３）を間隔を
置いて開口して、これら各容量制御孔（１２）（１３）
を、開閉弁（１４）（１５）を介して前記高段圧縮機（
２）の低圧側、即ち中間圧（ＭＰ）側に連通ずると共に
、前記スライド弁（３）をロードダウン側に制御する第
２制御室（１１）を、前記高段圧縮機（２）の高圧（Ｈ
Ｐ）側に連通させる一方、前記ピストン（５）には、該
ピストン（５）を貫通する絞り（１６）を穿孔し、該絞
り（１６）を介して前記第１制御室（ｌＯ）と第２制御
室（１１）を連通させるのである。Furthermore, the cylinder chamber (6) of the low-stage compressor (1) is divided by the piston (5) to form two chambers, and of these two chambers, the slide valve (3) is controlled to the load-up side. Two capacity control holes (12) and (13) are opened at intervals along the moving direction of the slide valve (3) in the first control chamber (lO), and each of these capacity control holes (12) (13)
is connected to the high-stage compressor (
A second control chamber (11) is connected to the low pressure side of the high-stage compressor (2), that is, the intermediate pressure (MP) side, and controls the slide valve (3) to the load-down side. (H
On the other hand, the piston (5) is provided with a throttle (16) that passes through the piston (5), and the first control chamber (lO) and the first control chamber (lO) are connected to each other through the throttle (16). This allows the two control rooms (11) to communicate with each other.
具体的には、前記高段圧縮機（２）の吐出側と前記第２
制御室（１１）とを連通ずる第１連絡管（１７）を設け
ると共に、該第１連絡管（１７）に第１分岐管（１８）
を設けて、該分岐管（１８）を高段圧縮機（２）の後記
する第４制御室（１８）に接続するのである。又一方、
前記低段圧縮機（１）の吐出側、即ち前記高段圧縮機（
２）の吸入側、即ち中間圧（ＭＰ）Ｈに連通ずる第２連
絡管（２０）を設けると共に、前記第１制御室（１０）
の側壁には第１容量制御孔（１２）と第２容量制御孔（
１３）を、前記ピストン（５）が移動する方向に所定間
隔を置くように穿孔し、これら容量制御孔（１２）（１
３）には、第１開閉弁（１４）を介装した第１支管（２
１）及び第２開閉弁（１５）を介装した第２支管（２２
）をそれぞれ接続し、これら第１及び第２支管（２１）
（２２）を介して前記各容量制御孔（１２）（１３）を
、前記第２連絡管（２０）に連通させるのである。更に
、前記ピストン（５）には、小径としたｎ通孔を穿孔し
、この貫通孔を前記第１制御室（１０）と第２制御室（
１１）とを連通させる絞り（１６）とするのである。Specifically, the discharge side of the high stage compressor (2) and the second
A first communication pipe (17) communicating with the control room (11) is provided, and a first branch pipe (18) is provided in the first communication pipe (17).
The branch pipe (18) is connected to a fourth control room (18), which will be described later, of the high-stage compressor (2). On the other hand,
The discharge side of the low stage compressor (1), that is, the high stage compressor (
A second communication pipe (20) communicating with the suction side of 2), that is, intermediate pressure (MP) H, is provided, and the first control chamber (10)
A first capacity control hole (12) and a second capacity control hole (
13) are bored at predetermined intervals in the direction in which the piston (5) moves, and these capacity control holes (12) (1
3) has a first branch pipe (2) interposed with a first on-off valve (14).
1) and a second branch pipe (22) interposed with a second on-off valve (15).
) respectively, and these first and second branch pipes (21)
(22), the capacity control holes (12) and (13) are communicated with the second communication pipe (20). Furthermore, the piston (5) is bored with an n through hole having a small diameter, and this through hole is connected to the first control chamber (10) and the second control chamber (
11) is used as a diaphragm (16) that communicates with the aperture.
尚、（１９）（２３）は、高段圧縮機（２）のシリンダ
室（８）を、ロー／ド（２４）を介して前記スライド弁
（７）に接続したピストン（９）により区画した２室で
あって、（２３）はスライド弁（７）をロードアップ側
に制御する第３制御室、＜１９）は、前記スライド弁（
７）をロードダウン側に制御する第４制御室である。又
、（２５）（２Ｂ）は、前記第３制御室（２３）に接続
した第３及び第４支管であり、これら各支管（２５）（
２Ｂ）には第３及び第４開閉弁（２７）（２８）を介装
している。Note that (19) and (23) are such that the cylinder chamber (8) of the high-stage compressor (2) is divided by a piston (9) connected to the slide valve (7) via a load/load (24). There are two chambers, (23) is a third control chamber that controls the slide valve (7) to the load-up side, and <19) is a third control chamber that controls the slide valve (7) to the load-up side.
7) to the load down side. Further, (25) (2B) are third and fourth branch pipes connected to the third control room (23), and each of these branch pipes (25) (
2B) is equipped with third and fourth on-off valves (27) and (28).
又、前記各ロッド（４）（２４）の直径は大きくとり、
前記ピストン（５）の第１制御室（１０）と第２制御室
（１１）に曝される面積の差、及び前記ピストン（２４
）の第３制御室（２３）と第４制御室（１８）に曝され
る面積の差を積極的に設けているのである。Moreover, the diameter of each of the rods (4) and (24) is set large,
The difference in area exposed to the first control chamber (10) and the second control chamber (11) of the piston (5) and the piston (24)
) The area exposed to the third control room (23) and the fourth control room (18) is positively provided with a difference in area.
次に、以上のように構成したスクリュー形２段圧縮機に
おける低段圧縮機（１）のスライド弁（３）の動きを説
明する。Next, the movement of the slide valve (3) of the low stage compressor (1) in the screw type two-stage compressor configured as above will be explained.
先ず、前記第１支管（２１）及び第２支管（２２）に介
装した二つの開閉弁（１４）（１５）を閉じると、前記
第１制御室（ｌＯ）には、常時ｆ１ｑ記第１ｉ１格菅（
１７）からの高圧（）（Ｐ）になっており、第２制御室
（１１）は前記絞り（１８）を介して第１制御室（１ｏ
）に連通しているから、第２制御室（１１）は高圧（Ｈ
Ｐ）になるのである。このとき、前記ピストン（５）に
は、前記スライド弁（３）の両端面に作用する中間圧（
ＭＰ）と低圧（ＬＰ）とにより、即ち該スライド弁（３
）の断面積に前記各圧力の差圧を乗じた力が第２図の右
方向きに、即ちロードアップ側に作用すると同時に、前
記ロッド（４）の断面積に前記高圧（ＨＰ）と前記中間
圧（ＭＰ）との差圧を乗じた力も又ロードアップ側に作
用することになり、前記スライド弁（３）の両端面に作
用する中間圧（ＭＰ）と低圧（ＬＰ）とに差圧がなくて
も、前記スライド弁（３）をロードアップ側に移動させ
ることができる。First, when the two on-off valves (14) and (15) installed in the first branch pipe (21) and the second branch pipe (22) are closed, the first control room (lO) is always filled with f1q 1i1. Kakusuga (
17), and the second control chamber (11) is connected to the first control chamber (1o) through the throttle (18).
), the second control room (11) is at high pressure (H
P). At this time, the piston (5) has an intermediate pressure (
MP) and low pressure (LP), i.e. the slide valve (3
) multiplied by the pressure difference between the above pressures acts in the right direction in FIG. The force multiplied by the differential pressure with the intermediate pressure (MP) will also act on the load-up side, and a differential pressure will be created between the intermediate pressure (MP) and the low pressure (LP) acting on both end surfaces of the slide valve (3). Even without the slide valve (3), the slide valve (3) can be moved to the load-up side.
又、前記第１開閉弁（１４）を開にすると、第１ｕｉａ
室（１０５（を第２連絡ｆｆ（２０）に連通し中間圧（
ＭＰ）になり、ピストン（５）には、該ピストン（５）
の第１制御室（１０）に曝されている面積から、前記ピ
ストン（５）の断面積を差し引いた面積に、高圧（ＨＰ
）を乗じた力がロートダウン側に作用する一方、前記ピ
ストン（５）の面積に中間圧（ＭＰ）を乗じた力が逆方
向に作動するが、中間圧（ＭＰ）が零に近いから、前者
の力の方が後者の力より常に大きくなり、したがって、
前記ピストン（５）が第２図左方側、即ちロードダウン
側に移動することができるのである。Further, when the first on-off valve (14) is opened, the first uia
The chamber (105) is communicated with the second communication ff (20) to maintain an intermediate pressure (
MP), and the piston (5)
The area exposed to the first control chamber (10) minus the cross-sectional area of the piston (5) is equal to
) acts on the rotor down side, while the force obtained by multiplying the area of the piston (5) by the intermediate pressure (MP) acts in the opposite direction, but since the intermediate pressure (MP) is close to zero, The force of the former will always be greater than the force of the latter, and therefore,
The piston (5) can move to the left side in FIG. 2, that is, to the load down side.
尚、（２９）は第２制御室（１１）に内装したばねであ
り、ピストン（５）をロードダウン側に付勢するもので
あるから、その付勢する力を前記ピストン（５）の差圧
による作動に大きく影響を与えない程度に設定している
。Note that (29) is a spring installed in the second control chamber (11), which biases the piston (5) toward the load down side. It is set to a level that does not significantly affect pressure-induced operation.
（発明の効果）
以上のごとく、本発明によれば、低段圧縮機（１）と高
段圧縮機（２）とを備えたスクリュー形２段圧縮機の容
量制御装置であって、前記低段圧縮機（１）にスライド
弁（３）を設け、このスライド弁（３）にロフト（４）
を介して連結したピストン（５）をシリンダ室（６）に
配設し、前記ピストン（５）の作動で前記スライド弁（
３）を移動させて、前記低段圧縮機（１）の容量制御を
行なう一方、前記ピストン（５）で区画する２室のうち
、前記スライド弁（３）をロードアップ側に制御する第
１制御室（１０）に、前記スライド弁（３）の移動方向
に沿って複数の容量制御孔（１２）・・・を開口して、
これら各容量制御孔（１２）・・・を開閉弁（１４）（
１５）を介して前記高段圧縮機（２）の低圧側に連通ず
ると共に、前記スライド弁（３）をロードダウン側に制
御する第２制御室（１１）を、前記高段圧縮機（２）の
高圧側に連通し、かつ、前記第１及び第２制御室（１１
）（１）を絞り（１６）を介して連通したから、第２制
御室（１１）に高段圧縮機（２）の吐出側の高圧を常に
作用させる一方、開閉弁（１４）（１５）の開閉操作に
より第１制御室（１０）を前記高段圧縮機（２）の低圧
側に連通したり、連通を遮断したりして、前記ピストン
（５）を作動させ、該ピストン（５）の作動により前記
スライド弁（３）を移動させ、容量制御することができ
、容量制御運転時、前記低段圧縮機（１）の吐出側の圧
力が低下して該圧縮機（１）の低圧側圧力に近づいても
、該圧縮機（１）に設けたスライド弁（３）を移動させ
る前記ピストン（５）を作動させるに必要な差圧を得る
ことができ、この結果、差圧が少ないときでも低段圧縮
機（１）を８全運転できるスクリュー形２段圧縮機を提
供できるに至ったのである。(Effects of the Invention) As described above, according to the present invention, there is provided a capacity control device for a two-stage screw compressor including a low-stage compressor (1) and a high-stage compressor (2). A slide valve (3) is provided in the stage compressor (1), and a loft (4) is installed in this slide valve (3).
A piston (5) connected through the cylinder chamber (6) is disposed in the cylinder chamber (6), and the operation of the piston (5) causes the slide valve (
3) to control the capacity of the low-stage compressor (1), while controlling the first slide valve (3) to the load-up side of the two chambers partitioned by the piston (5). A plurality of capacity control holes (12) are opened in the control chamber (10) along the moving direction of the slide valve (3),
Each of these capacity control holes (12)...opening/closing valves (14) (
A second control chamber (11) that communicates with the low pressure side of the high stage compressor (2) via the high stage compressor (15) and controls the slide valve (3) to the load down side is connected to the high stage compressor (2). ), and communicates with the high pressure side of the first and second control chambers (11
) (1) are communicated through the throttle (16), so that the high pressure on the discharge side of the high stage compressor (2) is always applied to the second control chamber (11), while the on-off valves (14) and (15) Opening/closing operations connect the first control chamber (10) to the low pressure side of the high-stage compressor (2) or cut off the communication, thereby operating the piston (5). By operating the slide valve (3), the capacity can be controlled by moving the slide valve (3), and during capacity control operation, the pressure on the discharge side of the low stage compressor (1) decreases, resulting in a low pressure of the compressor (1). Even if the pressure approaches the side pressure, the differential pressure necessary to operate the piston (5) that moves the slide valve (3) provided in the compressor (1) can be obtained, and as a result, the differential pressure is small. We have now been able to provide a two-stage screw compressor that can operate the low-stage compressor (1) at full capacity even when the engine is in use.
第１図は、本発明の概略配管配置図、第２図は低段圧縮
機の要部拡大断面説明図、第３図は従来例を示す要部説
明図である。
（１）・・・・・・・・・・・・・・・・・・低段圧縮
機（２）・・・・・・・・・・・・・・・・・・高段圧
縮機（３）・・・・・・・・・・・・・・・・・・スラ
イド弁第１図
第２図
（４）・・・・・・・・・・・・・・・・・・ロッド（
５）・・・・・・・・・・・・・・・・・・ピストン（
１０）・・・・・・・・・・・・・・・第１？ｌ／Ｉ御
室（１１）・・・・・・・・・・・・・・・第２制御室
（１２）・・・・・・・・・・・・・・・第１容量制御
孔（１３）・・・・・・・・・・・・・・・第２容量制
御孔（１４）・・・・・・・・・・・・・・・第１開閉
弁（１５）・・・・・・・・・・・・・・・第２開閉弁
（１６）・・・・・・・・・・・・・・・絞り代理人
弁理士 津 １）直 久ｂFIG. 1 is a schematic piping arrangement diagram of the present invention, FIG. 2 is an enlarged cross-sectional view of a main part of a low stage compressor, and FIG. 3 is an explanatory view of a main part of a conventional example. (1)・・・・・・・・・・・・・・・・・・Low stage compressor (2)・・・・・・・・・・・・・・・・・・High stage compressor (3)・・・・・・・・・・・・・・・・・・ Slide valve Fig. 1 Fig. 2 (4)・・・・・・・・・・・・・・・・・・rod(
5)・・・・・・・・・・・・・・・Piston (
10)・・・・・・・・・・・・First? l/I room (11) 2nd control room (12) 1st capacity control hole ( 13)......Second capacity control hole (14)...First on-off valve (15)...・・・・・・・・・・・・Second on-off valve (16)・・・・・・・・・・・・ Throttle agent
Patent Attorney Tsu 1) Hisashi Nao b
Claims (1)
クリュー形２段圧縮機の容量制御装置であって、前記低
段圧縮機（１）にスライド弁（３）を設け、このスライ
ド弁（３）にロッド（４）を介して連結したピストン（
５）をシリンダ室（６）に配設し、前記ピストン（５）
の作動で前記スライド弁（３）を移動させて、前記低段
圧縮機（１）の容量制御を行なう一方、前記ピストン（
５）で区画する２室のうち、前記スライド弁（３）をロ
ードアップ側に制御する第１制御室（１０）に、前記ス
ライド弁（３）の移動方向に沿って複数の容量制御孔（
１２）（１３）を開口して、これら各容量制御孔（１２
）（１３）を開閉弁（１４）（１５）を介して前記高段
圧縮機（２）の低圧側に連通すると共に、前記スライド
弁（３）をロードダウン側に制御する第２制御室（１１
）を、前記高段圧縮機（２）の高圧側に連通し、かつ、
前記第１及び第２制御室（１０）（１２）を絞り（１６
）を介して連通したことを特徴とするスクリュー形２段
圧縮機の容量制御装置。1) A capacity control device for a screw type two-stage compressor comprising a low-stage compressor (1) and a high-stage compressor (2), wherein a slide valve (3) is provided to the low-stage compressor (1). A piston (
5) is arranged in the cylinder chamber (6), and the piston (5)
The operation of the slide valve (3) moves the slide valve (3) to control the capacity of the low stage compressor (1), while the piston (
Of the two chambers divided by 5), a first control chamber (10) for controlling the slide valve (3) to the load-up side has a plurality of capacity control holes (
12) (13) to open each of these capacity control holes (12).
) (13) A second control chamber (13) that communicates with the low pressure side of the high stage compressor (2) via the on-off valves (14) and (15) and controls the slide valve (3) to the load down side. 11
) communicates with the high pressure side of the high stage compressor (2), and
The first and second control chambers (10) and (12) are throttled (16
) A capacity control device for a two-stage screw compressor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6905889A JPH0759951B2 (en) | 1989-03-20 | 1989-03-20 | Capacity control device for screw type two-stage compressor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6905889A JPH0759951B2 (en) | 1989-03-20 | 1989-03-20 | Capacity control device for screw type two-stage compressor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02248684A true JPH02248684A (en) | 1990-10-04 |
| JPH0759951B2 JPH0759951B2 (en) | 1995-06-28 |
Family
ID=13391590
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6905889A Expired - Lifetime JPH0759951B2 (en) | 1989-03-20 | 1989-03-20 | Capacity control device for screw type two-stage compressor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0759951B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1457679A2 (en) * | 2003-03-12 | 2004-09-15 | Mayekawa Mfg. Co., Ltd. | Screw compressor capable of manually adjusting both internal volume ratio and capacity |
| CN100455814C (en) * | 2005-06-30 | 2009-01-28 | 日立空调·家用电器株式会社 | Two-stage screw compressor |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5634228B2 (en) * | 2010-11-12 | 2014-12-03 | 三菱電機株式会社 | Screw refrigerator |
-
1989
- 1989-03-20 JP JP6905889A patent/JPH0759951B2/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1457679A2 (en) * | 2003-03-12 | 2004-09-15 | Mayekawa Mfg. Co., Ltd. | Screw compressor capable of manually adjusting both internal volume ratio and capacity |
| EP1457679A3 (en) * | 2003-03-12 | 2004-11-17 | Mayekawa Mfg. Co., Ltd. | Screw compressor capable of manually adjusting both internal volume ratio and capacity |
| CN100455814C (en) * | 2005-06-30 | 2009-01-28 | 日立空调·家用电器株式会社 | Two-stage screw compressor |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0759951B2 (en) | 1995-06-28 |
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