JP2004169677A - Positive pressure/negative pressure supply device - Google Patents

Positive pressure/negative pressure supply device Download PDF

Info

Publication number
JP2004169677A
JP2004169677A JP2002373239A JP2002373239A JP2004169677A JP 2004169677 A JP2004169677 A JP 2004169677A JP 2002373239 A JP2002373239 A JP 2002373239A JP 2002373239 A JP2002373239 A JP 2002373239A JP 2004169677 A JP2004169677 A JP 2004169677A
Authority
JP
Japan
Prior art keywords
negative pressure
positive pressure
pressure
positive
supply device
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
JP2002373239A
Other languages
Japanese (ja)
Inventor
Yoji Ise
養治 伊勢
Keizo Otani
圭三 大谷
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.)
Convum Ltd
Original Assignee
Myotoku 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 Myotoku Ltd filed Critical Myotoku Ltd
Priority to JP2002373239A priority Critical patent/JP2004169677A/en
Priority to PCT/JP2003/014851 priority patent/WO2004046551A1/en
Priority to AU2003284606A priority patent/AU2003284606A1/en
Publication of JP2004169677A publication Critical patent/JP2004169677A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04BPOSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B41/00Pumping installations or systems specially adapted for elastic fluids
    • F04B41/02Pumping installations or systems specially adapted for elastic fluids having reservoirs
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04BPOSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B39/00Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F04B39/10Adaptations or arrangements of distribution members
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04BPOSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B39/00Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F04B39/12Casings; Cylinders; Cylinder heads; Fluid connections
    • F04B39/123Fluid connections
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04BPOSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B7/00Piston machines or pumps characterised by having positively-driven valving
    • F04B7/0003Piston machines or pumps characterised by having positively-driven valving the distribution member forming both the inlet and discharge distributor for one single pumping chamber
    • F04B7/0015Piston machines or pumps characterised by having positively-driven valving the distribution member forming both the inlet and discharge distributor for one single pumping chamber and having a slidable movement

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
  • Compressor (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To supply positive pressure and negative pressure with one power source without separately using a compressor or a vacuum pump. <P>SOLUTION: The positive pressure/negative pressure supply device has a single pump having an outlet and an inlet, a changeover mechanism is connected to the outlet and inlet, and the positive pressure or negative pressure is supplied through a positive pressure passage and a negative pressure passage. <P>COPYRIGHT: (C)2004,JPO

Description

【0001】
【発明の属する技術分野】
本発明は、ポンプにより正圧及び負圧を供給する正圧負圧供給装置に関する。
【0002】
【従来技術】
従来より、正圧供給、負圧供給の手段としてコンプレッサー、真空ポンプ、等が提案され実用化されている。これらは、コンプレッサーによる正圧供給、真空ポンプによる負圧供給と各々別々の動力源で稼働されている。
【0003】
【発明が解決しようとする課題】
各々別々の動力源で正圧、負圧を発生させて供給することは、簡便な方法であるが動力源を複数配置することは、ロスが多く経済的でないという問題があり、単数の動力源で正圧、負圧を経済的に供給する正圧負圧供給装置を提供することである。
【0004】
【課題を解決するための手段】
本発明に係る正圧負圧供給装置は、排出口及び吸入口を有するポンプ、該排出口及び該吸入口に接続される切替機構並びに正圧経路及び負圧経路よりなり、単数の動力源のポンプを用いて正圧及び負圧を供給する。単数のポンプで正圧及び負圧が供給できるため経済的な正圧負圧供給装置を提供することができる。更にセンサを用いて正圧及び負圧を測定し、測定した検出値により切替機構をコントロールすることにより稼動、停止、正圧負圧の切り替え、などを行うことにより一層経済的な正圧負圧供給装置を提供することができる。
【0005】
本発明に係る正圧負圧供給装置は、排出口及び吸入口を有するポンプ、該排出口及び該吸入口に接続される切替機構並びに正圧経路及び負圧経路よりなる。更に、正圧経路及び/又は負圧経路にセンサを配置すること、更に切替機構がセンサの検出値によりコントロールされて作動すること、などである。本発明に係る正圧負圧供給装置は、以下の詳細な記述に限定されるものではない。
【0006】
本発明に係る正圧負圧供給装置において、排出口及び吸入口を有するポンプは、特に限定するものではなく、一般的に使用されているポンプでよい。例えば、コンプレッサー、真空ポンプ、等であり、また、レシプロポンプ、スクロールポンプ、ベーンポンプ、レシプロコンプレッサ、スクロールコンプレッサ、ベーンコンプレッサ、等である。
【0007】
切替機構は、ポンプの機能を正圧発生又は負圧発生を主動作として稼動させるかを切り替える装置である。例えば、正圧発生を主動作として稼動させる場合には、ポンプの排出口を正圧経路に接続させ、吸入口を大気に接続解放する。例えば、負圧発生を主動作として稼動させる場合は、ポンプの吸入口を負圧経路に接続させ、排出口を大気に接続解放する。該切替機構は、複数個の電磁弁ソレノイドを組み合わせて構成する切替機構、特殊な切替機構、などである。
【0008】
センサは、正圧検出センサ、圧力センサー、負圧検出センサ、真空センサー、流量センサ、などである。例えば、センサで正圧を検出し基準値より減少したことを検出して切替機構を作動させ正圧供給する、他の基準値を超えたことを検出して切替機構を作動させ正圧供給を停止する。また、センサで負圧を検出し基準値を下回ることを検出して切替機構を作動させて負圧供給をする、他の基準値を上回ることを検出して切替機構を作動させて負圧供給を停止する。好ましくは、正圧供給、負圧供給を同時にすることなく、どちらか一方が作動するように切替装置をコントロールすることである。
【0009】
【実施例】
本発明に係る正圧負圧供給装置の実施例を例示する。本発明に係る正圧負圧供給装置は、以下の実施例に限定されるものではない。
【0010】
(実施例1)正圧負圧供給装置の構成として、300Wのコンプレッサーポンプ1の排出口2及び吸入口3に図2に示す様な特殊な切替機構6を接続する。図2の排出口管4と排出口2、及び吸入口管5と吸入口3を配管接続する。図2の正圧経路7に正圧経路、負圧経路8に負圧経路を配管接続する。図2の大気放出経路13は大気に放出する。正圧経路及び負圧経路に逆止弁(図示せず)を配置する。その先の正圧経路及び/又は負圧経路に圧力センサー9、真空センサー10を配置し、正圧溜め11及び負圧溜め12を配置する。コンプレッサーのON−OFF、切替機構6のホルダー15内でスライド動作するシリンダー14−1.14−2.14−3(連動した動作で稼動する。)のプッシュ・プル動作及びセンサーに接続されているコントローラ(図示せず)よりなる。
【0011】
コントローラは、圧力センサーの検出値を読み取り圧力センサーの値が基準値より減少したことを検出して切替機構6にFの力を働かせてゅー(図2(a))排出口管4と正圧経路7を導通させ、吸入口管5と大気放出経路13を導通させる、このとき、吸入口管5と負圧経路8は閉閑されていて、正圧経路を通じて正圧溜め11に加圧気体が蓄えられる。コントローラは、真空センサーの検出を読み取り真空センサの値が基準値より減少したことを検出して切替機構6に−Fの力を働かせて(図2(b))吸入口管5と負圧経路8を導通させ、排出口管4と大気放出経路13を導通させる、このとき排出口管4と正圧経路7は閉閑されていて、負圧経路を通じて負圧溜め12に負圧が蓄えられる。正圧及び負圧が十分であるときは、コンプレッサを停止することもできる。正圧、負圧は逆止弁により減少することがない。
【0012】
実施例1の構成より成る正圧負圧供給装置は、1台のコンプレッサー1と切替機構6を圧力センサー9、真空センサー10、コントローラーで作動させることにより経済的に正圧負圧を供給することができる。
【0013】
(実施例2)実施例1における切替機構6を3方向電磁弁で構成するほかは略同様な構成である。3方向電磁弁とは、INPUTとOUTPUT1及びOUTPUT2(通常大気解放口)を備えた市販の電磁弁を使用し、電磁弁1のINPUT1をコンプレッサーポンプの排出口管4と接続、OUTPUT1−1を正圧経路7と接続、OUTPUT1−2を大気に解放する。電磁弁2のINPUT2をコンプレッサーポンプの吸入口管5と接続、OUTPUT2−1を負圧経路8と接続、OUTPUT2−2を大気に解放する。実施例1と略同様に正圧センサ、負圧センサの測定値により電磁弁をコントロールして正圧、負圧を切替、停止する。
【0014】
実施例2による正圧負圧供給装置は、1台のコンプレッサーと切替機構(2個の電磁弁)を圧力センサー、真空センサー、コントローラーで作動させることにより経済的に正圧負圧を供給することができる
【0015】
【発明の効果】
本発明に係る正圧負圧供給装置は、排出口及び吸入口を有する単数のポンプにセンサによりコントロールされた切替機構並びにセンサが配された正圧経路及び負圧経路よりなり、一台のポンプによりコントロールされた正圧及び負圧が供給されて経済的である。
【図面の簡単な説明】
【図1】本発明に係る正圧負圧供給装置の一実施態様を示す図である。
【図2】本発明に係る正圧負圧供給装置に使用される切替機構の一実施態様を示す断面図である。(a)は、F方向にシリンダーが引かれている状態であり、(b)は、−F方向にシリンダーが押されている状態である。
【符号の説明】
1 ポンプ
2 排出口
3 吸入口
4 排出口管
5 吸入口管
6 切替機構
7 正圧経路
8 負圧経路
9 正圧センサ
10 負圧センサ
11 正圧溜め
12 負圧溜め
13 大気放出経路
14−1.14−2.14−3 シリンダー
15 ホルダー
[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a positive pressure / negative pressure supply device that supplies a positive pressure and a negative pressure by a pump.
[0002]
[Prior art]
Conventionally, compressors, vacuum pumps, and the like have been proposed and put into practical use as means for supplying positive pressure and negative pressure. These are operated by separate power sources, each of which supplies a positive pressure by a compressor and a negative pressure by a vacuum pump.
[0003]
[Problems to be solved by the invention]
It is a simple method to generate and supply positive pressure and negative pressure with separate power sources, respectively.However, arranging a plurality of power sources has a problem that loss is large and it is not economical. The present invention provides a positive pressure / negative pressure supply device for supplying positive pressure and negative pressure economically.
[0004]
[Means for Solving the Problems]
The positive pressure / negative pressure supply device according to the present invention includes a pump having a discharge port and a suction port, a switching mechanism connected to the discharge port and the suction port, and a positive pressure path and a negative pressure path. A positive pressure and a negative pressure are supplied using a pump. Since positive pressure and negative pressure can be supplied by a single pump, an economical positive pressure / negative pressure supply device can be provided. Furthermore, the positive and negative pressures are measured by using a sensor, and the switching mechanism is controlled by the measured detection value to operate, stop, and switch between positive and negative pressures. A supply device can be provided.
[0005]
A positive pressure / negative pressure supply device according to the present invention includes a pump having a discharge port and a suction port, a switching mechanism connected to the discharge port and the suction port, and a positive pressure path and a negative pressure path. Further, the arrangement of the sensor in the positive pressure path and / or the negative pressure path, and the operation of the switching mechanism controlled by the detected value of the sensor, and the like. The positive / negative pressure supply device according to the present invention is not limited to the following detailed description.
[0006]
In the positive / negative pressure supply device according to the present invention, the pump having the discharge port and the suction port is not particularly limited, and may be a generally used pump. For example, a compressor, a vacuum pump, etc., and a reciprocating pump, a scroll pump, a vane pump, a reciprocating compressor, a scroll compressor, a vane compressor, etc.
[0007]
The switching mechanism is a device that switches whether the function of the pump is operated by generating positive pressure or generating negative pressure as a main operation. For example, when the operation is performed with the positive pressure generation as the main operation, the discharge port of the pump is connected to the positive pressure path, and the suction port is disconnected from the atmosphere. For example, when the operation is performed with the negative pressure generation as the main operation, the suction port of the pump is connected to the negative pressure path, and the discharge port is connected to the atmosphere and released. The switching mechanism is a switching mechanism configured by combining a plurality of solenoid solenoids, a special switching mechanism, or the like.
[0008]
The sensors are a positive pressure detection sensor, a pressure sensor, a negative pressure detection sensor, a vacuum sensor, a flow rate sensor, and the like. For example, the sensor detects positive pressure, detects that the pressure has decreased below the reference value, activates the switching mechanism and supplies the positive pressure, and detects that the pressure exceeds another reference value and activates the switching mechanism to supply the positive pressure. Stop. In addition, the sensor detects negative pressure, detects that the pressure falls below the reference value, activates the switching mechanism and supplies negative pressure, and detects that the pressure exceeds other reference values and activates the switching mechanism to supply negative pressure. To stop. Preferably, the switching device is controlled so that either one of the positive pressure supply and the negative pressure supply is operated without simultaneously performing the supply.
[0009]
【Example】
An example of a positive pressure / negative pressure supply device according to the present invention will be described. The positive / negative pressure supply device according to the present invention is not limited to the following embodiments.
[0010]
(Example 1) As a configuration of a positive pressure / negative pressure supply device, a special switching mechanism 6 as shown in FIG. 2 is connected to the discharge port 2 and the suction port 3 of a 300 W compressor pump 1. The outlet pipe 4 and the outlet 2 and the inlet pipe 5 and the inlet 3 of FIG. A positive pressure path is connected to the positive pressure path 7 and a negative pressure path is connected to the negative pressure path 8 in FIG. The atmosphere release path 13 shown in FIG. Check valves (not shown) are arranged in the positive pressure path and the negative pressure path. The pressure sensor 9 and the vacuum sensor 10 are arranged on the positive pressure path and / or the negative pressure path ahead, and the positive pressure reservoir 11 and the negative pressure reservoir 12 are disposed. It is connected to a push-pull operation of a cylinder 14-1.14-2.14-3 (which operates in an interlocked operation) and a sensor that slides in a holder 15 of the switching mechanism 6 and ON / OFF of the compressor. It consists of a controller (not shown).
[0011]
The controller reads the detected value of the pressure sensor, detects that the value of the pressure sensor has decreased below the reference value, and applies the force of F to the switching mechanism 6 so that the discharge port pipe 4 is correctly connected to the outlet port 4 (FIG. 2A). The pressure path 7 is made conductive, and the suction pipe 5 and the atmosphere discharge path 13 are made conductive. At this time, the suction pipe 5 and the negative pressure path 8 are closed, and the positive pressure reservoir 11 is pressurized through the positive pressure path. Gas is stored. The controller reads the detection of the vacuum sensor, detects that the value of the vacuum sensor has decreased below the reference value, and applies a force of -F to the switching mechanism 6 (FIG. 2 (b)). 8, the outlet pipe 4 and the atmosphere discharge path 13 are connected. At this time, the outlet pipe 4 and the positive pressure path 7 are closed, and the negative pressure is stored in the negative pressure reservoir 12 through the negative pressure path. . When the positive and negative pressures are sufficient, the compressor can be stopped. The positive and negative pressures are not reduced by the check valve.
[0012]
The positive pressure / negative pressure supply device having the configuration of the first embodiment can supply the positive pressure / negative pressure economically by operating one compressor 1 and the switching mechanism 6 with the pressure sensor 9, the vacuum sensor 10, and the controller. Can be.
[0013]
(Second Embodiment) The switching mechanism 6 in the first embodiment is substantially the same as the first embodiment except that the switching mechanism 6 is constituted by a three-way solenoid valve. As the three-way solenoid valve, a commercially available solenoid valve provided with INPUT, OUTPUT1, and OUTPUT2 (normally open to the atmosphere) is used. Connect to pressure path 7 and release OUTPUT1-2 to atmosphere. The INPUT 2 of the solenoid valve 2 is connected to the suction pipe 5 of the compressor pump, the OUTPUT 2-1 is connected to the negative pressure path 8, and the OUTPUT 2-2 is released to the atmosphere. As in the first embodiment, the solenoid valve is controlled based on the measured values of the positive pressure sensor and the negative pressure sensor to switch and stop the positive pressure and the negative pressure.
[0014]
The positive / negative pressure supply device according to the second embodiment can supply a positive / negative pressure economically by operating one compressor and a switching mechanism (two solenoid valves) with a pressure sensor, a vacuum sensor, and a controller. [0015]
【The invention's effect】
A positive pressure / negative pressure supply device according to the present invention includes a single pump having a discharge port and a suction port, a switching mechanism controlled by a sensor, and a positive pressure path and a negative pressure path in which a sensor is disposed. It is economical to supply the positive pressure and the negative pressure controlled by.
[Brief description of the drawings]
FIG. 1 is a diagram showing one embodiment of a positive pressure / negative pressure supply device according to the present invention.
FIG. 2 is a cross-sectional view showing one embodiment of a switching mechanism used in the positive pressure / negative pressure supply device according to the present invention. (A) is a state where the cylinder is pulled in the F direction, and (b) is a state where the cylinder is pushed in the −F direction.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Pump 2 Outlet 3 Inlet 4 Outlet pipe 5 Inlet pipe 6 Switching mechanism 7 Positive pressure path 8 Negative pressure path 9 Positive pressure sensor 10 Negative pressure sensor 11 Positive pressure reservoir 12 Negative pressure reservoir 13 Atmospheric discharge path 14-1 .14-2.14-3 Cylinder 15 holder

Claims (3)

排出口及び吸入口を有するポンプ、該排出口及び該吸入口に接続される切替機構並びに正圧経路及び負圧経路よりなることを特徴とする正圧負圧供給装置。A positive pressure / negative pressure supply device comprising: a pump having a discharge port and a suction port; a switching mechanism connected to the discharge port and the suction port; and a positive pressure path and a negative pressure path. 該正圧経路及び/又は該負圧経路にセンサを配したことを特徴とする請求項1に記載の正圧負圧供給装置。The positive pressure / negative pressure supply device according to claim 1, wherein a sensor is disposed in the positive pressure path and / or the negative pressure path. 切替機構がセンサの検出値によりコントロールされて作動することを特徴とする請求項1または2に記載の正圧負圧供給装置。The positive pressure / negative pressure supply device according to claim 1, wherein the switching mechanism operates by being controlled by a detection value of a sensor.
JP2002373239A 2002-11-20 2002-11-20 Positive pressure/negative pressure supply device Pending JP2004169677A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP2002373239A JP2004169677A (en) 2002-11-20 2002-11-20 Positive pressure/negative pressure supply device
PCT/JP2003/014851 WO2004046551A1 (en) 2002-11-20 2003-11-20 Positive and negative pressure supply device
AU2003284606A AU2003284606A1 (en) 2002-11-20 2003-11-20 Positive and negative pressure supply device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2002373239A JP2004169677A (en) 2002-11-20 2002-11-20 Positive pressure/negative pressure supply device

Publications (1)

Publication Number Publication Date
JP2004169677A true JP2004169677A (en) 2004-06-17

Family

ID=32322151

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2002373239A Pending JP2004169677A (en) 2002-11-20 2002-11-20 Positive pressure/negative pressure supply device

Country Status (3)

Country Link
JP (1) JP2004169677A (en)
AU (1) AU2003284606A1 (en)
WO (1) WO2004046551A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009535557A (en) * 2006-04-27 2009-10-01 ドラモンド サイエンティフィック カンパニー Method and apparatus for controlling fluid flow
JP7527669B2 (en) 2022-08-02 2024-08-05 三映電子工業株式会社 Diaphragm Pump

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8679170B2 (en) 2010-07-23 2014-03-25 Avacen, Inc. Methods and apparatus for therapeutic application of thermal energy
US9687385B2 (en) 2013-03-11 2017-06-27 Avacen, Inc. Methods and apparatus for therapeutic application of thermal energy including blood viscosity adjustment
US9192509B2 (en) * 2013-03-11 2015-11-24 Avacen, Inc. Methods and apparatus for therapeutic application of thermal energy including blood viscosity adjustment
CN105464928A (en) * 2016-02-02 2016-04-06 张栗 General inflation and exhaust pump
US11684282B2 (en) 2017-02-03 2023-06-27 Avacen, Inc. Systems and methods for evaluating blood circulation and early detection of cardiovascular issues

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5759148A (en) * 1995-10-18 1998-06-02 Sipin; Anatole J. Controlled pneumatic driving system
JPH09158844A (en) * 1995-12-11 1997-06-17 Sadahiro Ohinata Small air pump
JPH1085544A (en) * 1996-09-18 1998-04-07 Tokico Ltd Dry air supply device
JP3079817U (en) * 2001-02-23 2001-08-31 銓治 中川 Air injection / discharge combined machine with coin timer

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009535557A (en) * 2006-04-27 2009-10-01 ドラモンド サイエンティフィック カンパニー Method and apparatus for controlling fluid flow
JP7527669B2 (en) 2022-08-02 2024-08-05 三映電子工業株式会社 Diaphragm Pump

Also Published As

Publication number Publication date
WO2004046551A1 (en) 2004-06-03
AU2003284606A1 (en) 2004-06-15

Similar Documents

Publication Publication Date Title
EP1662117A3 (en) Fuel supply system
EP1857384A3 (en) Device for conveying powders through pipelines
EP1722173A3 (en) Two-Stage linear compressor
EP3057685B1 (en) Oxygen concentrator for mechanical ventilation
EP2095881A3 (en) Dense phase pump for dry particulate material
SE0201335L (en) Vacuum pump and ways to provide vacuum
JP2004169677A (en) Positive pressure/negative pressure supply device
RU2008132803A (en) HIGH PRESSURE COMPRESSOR, ITS APPLICATION AND METHOD OF ITS OPERATION
WO2005050107A3 (en) Tandem compressors with discharge valve on connecting lines
GB0503946D0 (en) Vacuum pump
EP1126202A3 (en) Valve assembly for gas cylinder
JP2002257099A (en) Vacuum producing device
JP2004144088A (en) Multistage piston vacuum pump and its operating method
ATE434579T1 (en) CONTROL DEVICE
WO2003103904A1 (en) Vacuum system
CN105484969B (en) Vacuum pump system
KR102190221B1 (en) Method for pumping in a system of vacuum pumps and system of vacuum pumps
EP0997639A3 (en) Variable displacement compressor
JPH025107Y2 (en)
JP7567729B2 (en) Positive and negative pressure switching circuit
WO2009028232A1 (en) Steam system
CN201277178Y (en) Gas circuit integrated controller for mining air compressor
KR100588260B1 (en) Oxygen generator which discharge flow rate of oxygen is increased
JP2004245209A (en) Pump pressure control device
JP6747479B2 (en) Oxygen concentrator