US20130272911A1 - Screw Compressor Having Slide Valve With Flexible Volume Ratio - Google Patents

Screw Compressor Having Slide Valve With Flexible Volume Ratio Download PDF

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Publication number
US20130272911A1
US20130272911A1 US13/496,087 US201113496087A US2013272911A1 US 20130272911 A1 US20130272911 A1 US 20130272911A1 US 201113496087 A US201113496087 A US 201113496087A US 2013272911 A1 US2013272911 A1 US 2013272911A1
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United States
Prior art keywords
air cylinder
slide valve
compressor
end surface
pressure
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.)
Abandoned
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US13/496,087
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English (en)
Inventor
Yan Tang
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.)
Shanghai Power Technology Screw Machinery Co Ltd
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Shanghai Power Technology Screw Machinery Co Ltd
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Publication date
Application filed by Shanghai Power Technology Screw Machinery Co Ltd filed Critical Shanghai Power Technology Screw Machinery Co Ltd
Assigned to SHANGHAI POWER TECH. SCREW MACHINERY CO., LTD. reassignment SHANGHAI POWER TECH. SCREW MACHINERY CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: TANG, YAN
Publication of US20130272911A1 publication Critical patent/US20130272911A1/en
Abandoned legal-status Critical Current

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    • 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
    • F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
    • F04C18/08—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C18/12—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
    • F04C18/14—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons
    • F04C18/16—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with helical teeth, e.g. chevron-shaped, screw type
    • 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
    • F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
    • 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

Definitions

  • the present invention relates to a screw compressor in the field of compressor technologies, and more particularly to a screw compressor having a slide valve with a flexible volume ratio.
  • a twin-screw compressor is formed by a pair of male and female screws parallel to and engaged with each other, and is the most widely applied kind of compressor among rotary compressors.
  • FIG. 1 An indicator diagram of a screw compressor in ideal working conditions is shown in FIG. 1 , where a shaded part indicates power consumption during one cycle.
  • a pressure at a compression end does not match an exhaust pressure, which likely incurs over-compression (delay in opening results in excessive compression) or under-compression (opening prematurely results in insufficient compression).
  • an optimal volume ratio of the screw compressor is achieved. As shown in FIG. 4 , the volume ratio of the screw compressor is equal to V max /V compression end .
  • FIG. 2 is an indicator diagram of a screw compressor in the case of over-compression.
  • the screw compressor additionally consumes part of power.
  • the noise may be increased at the same time.
  • FIG. 3 is an indicator diagram of a screw compressor in the case of under-compression.
  • the screw compressor also additionally consumes part of power.
  • air may enter the screw compressor from the outside, and the noise is also increased at the same time.
  • a technical problem to be solved by the present invention is to provide a screw compressor having a slide valve with a flexible volume ratio, so that the volume ratio of the screw compressor may be automatically adjusted to an optimal state, and power consumption and noise are reduced.
  • the present invention adopts the following technical solutions.
  • a screw compressor having a slide valve with a flexible volume ratio comprises a casing, a screw, an air entry, an air outlet, a slide valve, a first air cylinder and a second air cylinder.
  • the slide valve is disposed between the first air cylinder and the second air cylinder.
  • the slide valve comprises a slide valve main body, and two ends of the slide valve main body are respectively a first end surface and a second end surface; sectional areas of the first end surface, the second end surface and the slide valve main body are the same, and the first end surface and the second end surface seal the first air cylinder and the second air cylinder respectively.
  • the first air cylinder is connected to the air outlet of the compressor through a first connection pipe, and in the first air cylinder, a pressure generated by the first end surface corresponds to an exhaust pressure.
  • the second air cylinder is connected to a last closed spiral flute through a second connection pipe, and in the second air cylinder, a pressure generated by the second end surface corresponds to a pressure at a compression end of the compressor, that is, an average pressure in the last closed spiral flute before the compressor exhausts.
  • the slide valve searches for balance under the driving of pressures in the first air cylinder and the second air cylinder, so as to achieve an optimal volume ratio of the compressor.
  • the slide valve moves towards the second air cylinder, so as to increase the pressure at the compression end of the compressor.
  • the slide valve moves towards the first air cylinder, so as to decrease the pressure at the compression end of the compressor.
  • An elastic mechanism is disposed in the second air cylinder. One end of the elastic mechanism is connected to the second air cylinder, and the other end is connected to the second end surface. The elastic mechanism ensures unloading and starting of the compressor.
  • a screw compressor having a slide valve with a flexible volume ratio comprises a casing, a screw, an air entry, an air outlet, a slide valve, a first air cylinder and a second air cylinder.
  • the slide valve is disposed between the first air cylinder and the second air cylinder.
  • the slide valve comprises a slide valve main body, and two ends of the slide valve main body are respectively a first end surface and a second end surface, wherein the first end surface and the second end surface seal the first air cylinder and the second air cylinder respectively.
  • the first air cylinder is connected to the air outlet of the compressor through a first connection pipe, and the second air cylinder is connected to a last closed spiral flute through a second connection pipe.
  • the slide valve searches for balance under the driving of pressures in the first air cylinder and the second air cylinder.
  • sectional areas of the first end surface, the second end surface and the slide valve main body are the same, or not the same, or different from one another.
  • the first air cylinder is connected to the air outlet of the compressor through a first connection pipe, and in the first air cylinder, a pressure generated by the first end surface is in direct proportion to an exhaust pressure;
  • the second air cylinder is connected to a last closed spiral flute through a second connection pipe, and in the second air cylinder, a pressure generated by the second end surface is in direct proportion to a pressure at a compression end of the compressor, that is, in direct proportion to an average pressure in the last closed spiral flute before the compressor exhausts.
  • the slide valve moves towards the second air cylinder, so as to increase the pressure at the compression end of the compressor; if the pressure generated by the first end surface is less than that generated by the second end surface, the slide valve moves towards the first air cylinder, so as to decrease the pressure at the compression end of the compressor.
  • an elastic mechanism is disposed in the second air cylinder, wherein one end of the elastic mechanism is connected to the second air cylinder, and the other end is connected to the second end surface; the elastic mechanism ensures unloading and starting of the compressor.
  • the slide valve is disposed on one side of the screw.
  • the screw compressor is a twin-screw compressor or a tri-rotor screw compressor.
  • the beneficial effect of the present invention lies in that, the screw compressor having a slide valve with a flexible volume ratio provided by the present invention enables the volume ratio of the screw compressor to be automatically adjusted to an optimal state, and reduces power consumption and noise.
  • the slide valve disposed in the screw compressor may adjust the pressures of the first air cylinder and the second air cylinder according to the exhaust pressure and the pressure at the compression end of the compressor, so that the exhaust pressure matches the pressure at the compression end of the compressor. If the pressure generated by the first end surface is greater than that generated by the second end surface, the slide valve moves towards the second air cylinder, so as to increase the pressure at the compression end of the compressor; if the pressure generated by the first end surface is less than that generated by the second end surface, the slide valve moves towards the first air cylinder, so as to decrease the pressure at the compression end of the compressor, thus ensuring that the screw compressor may automatically adjust the volume ratio of the compressor in any working conditions, and achieving the optimal volume ratio.
  • an elastic mechanism is disposed in the second air cylinder, enabling the slide valve to always be close to the first air cylinder (that is, an air suction end) before the screw compressor is started, so that the volume ratio is the lowest and the screw compressor can be easily started.
  • FIG. 1 is an indicator diagram of a screw compressor in ideal working conditions.
  • FIG. 2 is an indicator diagram of a screw compressor in the case of over-compression.
  • FIG. 3 is an indicator diagram of a screw compressor in the case of under-compression.
  • FIG. 4 is a schematic view of volume change in one cycle of the screw compressor.
  • FIG. 5 is a schematic structural view of a screw compressor.
  • the present invention discloses a screw compressor having a slide valve with a flexible volume ratio, which includes: a casing 1 , a screw 2 , an air entry, an air outlet 6 , a slide valve 3 , a first air cylinder 4 , a second air cylinder 5 , and the slide valve 3 is disposed between the first air cylinder 4 and the second air cylinder 5 .
  • the slide valve 3 may be disposed on one side of the screw 2 .
  • the screw compressor is a twin-screw compressor, and definitely, the present invention may also be used in a tri-screw compressor.
  • the slide valve 3 includes a slide valve main body 30 , and two ends of the slide valve main body 30 are respectively a first end surface 31 and a second end surface 32 .
  • a sectional area S 1 of the first end surface 31 , a sectional area S 2 of the second end surface 32 and a sectional area S 3 of the slide valve main body 30 are the same.
  • the first end surface 31 and the second end surface 32 respectively seal the first air cylinder 4 and the second air cylinder 5 .
  • the first air cylinder 4 is connected to the air outlet of the compressor through a first connection pipe 33 , and in the first air cylinder 4 , a pressure generated by the first end surface 31 corresponds to an exhaust pressure.
  • the second air cylinder 5 is connected to a last closed spiral flute of the screw compressor through a second connection pipe 34 , and in the second air cylinder 5 , a pressure generated by the second end surface 32 corresponds to a pressure at a compression end of the compressor, that is, an average pressure in the last closed spiral flute before the compressor exhausts.
  • the slide valve 3 searches for balance under the driving of the first air cylinder 4 and the second air cylinder 5 , so as to achieve an optimal volume ratio of the compressor. If the pressure generated by the first end surface 31 is greater than that generated by the second end surface 32 , that is, the exhaust pressure is greater than the pressure at the compression end of the compressor, the slide valve 3 moves towards the second air cylinder 5 , so as to increase the pressure at the compression end of the compressor. If the pressure generated by the first end surface 31 is less than that generated by the second end surface 32 , that is, the exhaust pressure is less than the pressure at the compression end of the compressor, the slide valve 3 moves towards the first air cylinder 4 , so as to decrease the pressure at the compression end of the compressor.
  • an elastic mechanism spring 35 , is disposed in the second air cylinder 5 , where one end of the spring 35 is connected to the second air cylinder 5 , and the other end is connected to the second end surface 32 , so that the slide valve is always close to the first air cylinder (that is, an air suction end) before the screw compressor is started, and in this way the volume ratio is the lowest and the screw compressor can be easily started.
  • the sectional area of a first end surface, the sectional area of a second end surface and the sectional area of a slide valve main body are the same, or not the same, or different from one another.
  • This embodiment provides a screw compressor having a slide valve with a flexible volume ratio, which includes a casing, a screw, an air entry, an air outlet, a slide valve, a first air cylinder and a second air cylinder.
  • the slide valve is disposed between the first air cylinder and the second air cylinder.
  • the slide valve includes the slide valve main body, and two ends of the slide valve main body are respectively the first end surface and the second end surface, where the first end surface and the second end surface seal the first air cylinder and the second air cylinder respectively.
  • the first air cylinder is connected to the air outlet of the compressor through a first connection pipe, and the second air cylinder is connected to a last closed spiral flute through a second connection pipe.
  • the slide valve searches for balance under the driving of pressures in the first air cylinder and the second air cylinder.
  • the first air cylinder is connected to the air outlet of the compressor through the first connection pipe, and in the first air cylinder, a pressure generated by the first end surface is in direct proportion to an exhaust pressure;
  • the second air cylinder is connected to the last closed spiral flute through the second connection pipe, and in the second air cylinder, a pressure generated by the second end surface is in direct proportion to a pressure at a compression end of the compressor, that is, the pressure generated by the second end surface is in direct proportion to an average pressure in the last closed spiral flute before the compressor exhausts.
  • the slide valve moves towards the second air cylinder, so as to increase the pressure at the compression end of the compressor; if the pressure generated by the first end surface is less than that generated by the second end surface, the slide valve moves towards the first air cylinder, so as to decrease the pressure at the compression end of the compressor.
  • the screw compressor having a slide valve with a flexible volume ratio provided by the present invention enables the volume ratio of the compressor to be automatically adjusted to an optimal state, thus reducing power consumption and noise.
  • the slide valve disposed in the screw compressor may adjust the pressures of the first air cylinder and the second air cylinder according to the exhaust pressure and the pressure at the compression end of the compressor, so that the exhaust pressure matches the pressure at the compression end of the compressor. If the pressure generated by the first end surface is greater than that generated by the second end surface, the slide valve moves towards the second air cylinder, so as to increase the pressure at the compression end of the compressor; if the pressure generated by the first end surface is less than that generated by the second end surface, the slide valve moves towards the first air cylinder, so as to decrease the pressure at the compression end of the compressor, thus ensuring that the screw compressor may automatically adjust the volume ratio of the compressor in any working conditions, and achieving the optimal volume ratio.
  • an elastic mechanism is disposed in the second air cylinder, so that the slide valve is always close to the first air cylinder (that is, the air suction end) before the screw compressor is started, and in this way the volume ratio is the lowest and the screw compressor can be easily started.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)
US13/496,087 2011-01-05 2011-05-16 Screw Compressor Having Slide Valve With Flexible Volume Ratio Abandoned US20130272911A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
CN201110001197.7 2011-01-05
CN201110001197.7A CN102042226B (zh) 2011-01-05 2011-01-05 具有柔性容积比滑阀的螺杆压缩机
PCT/CN2011/074074 WO2012092739A1 (zh) 2011-01-05 2011-05-16 具有柔性容积比滑阀的螺杆压缩机

Publications (1)

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US20130272911A1 true US20130272911A1 (en) 2013-10-17

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US13/496,087 Abandoned US20130272911A1 (en) 2011-01-05 2011-05-16 Screw Compressor Having Slide Valve With Flexible Volume Ratio

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US (1) US20130272911A1 (zh)
EP (1) EP2662569A4 (zh)
CN (1) CN102042226B (zh)
IN (1) IN2012DN04926A (zh)
WO (1) WO2012092739A1 (zh)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10954943B2 (en) 2013-12-19 2021-03-23 Carrier Corporation Compressor comprising a variable volume index valve

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CN102042226B (zh) * 2011-01-05 2014-12-31 上海维尔泰克螺杆机械有限公司 具有柔性容积比滑阀的螺杆压缩机
DE102011051730A1 (de) * 2011-07-11 2013-01-17 Bitzer Kühlmaschinenbau Gmbh Schraubenverdichter
CN105422445A (zh) * 2015-12-21 2016-03-23 珠海格力电器股份有限公司 机体、螺杆压缩机及家用电器
CN105673498A (zh) * 2016-04-01 2016-06-15 浙江开山凯文螺杆机械有限公司 带常开进气阀的螺杆压缩机及其启动方法
CN105715548A (zh) * 2016-04-01 2016-06-29 浙江开山凯文螺杆机械有限公司 带柔性滑阀的两级螺杆压缩机
CN105805009B (zh) * 2016-04-15 2018-07-13 珠海格力电器股份有限公司 压缩机和换热设备
CN106801619A (zh) * 2017-03-03 2017-06-06 上海维尔泰克螺杆机械有限公司 容积比可调的螺杆膨胀机
CN107387409B (zh) * 2017-09-04 2023-07-21 珠海格力电器股份有限公司 变频螺杆压缩机及空调
CN110410328A (zh) * 2019-08-21 2019-11-05 珠海格力电器股份有限公司 具有自动调节滑阀位置的压缩机及空调系统
CN110566461A (zh) * 2019-09-11 2019-12-13 珠海格力电器股份有限公司 双级压缩机及双级压缩机的控制方法及空调机组
CN110925199B (zh) * 2019-11-08 2020-11-06 珠海格力电器股份有限公司 螺杆压缩机及其控制方法和制冷系统
WO2021142085A1 (en) 2020-01-07 2021-07-15 Johnson Controls Technology Company Volume ratio control system for a compressor
WO2021142087A1 (en) 2020-01-07 2021-07-15 Johnson Controls Technology Company Volume ratio control system for a compressor

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US4678406A (en) * 1986-04-25 1987-07-07 Frick Company Variable volume ratio screw compressor with step control
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Publication number Priority date Publication date Assignee Title
US10954943B2 (en) 2013-12-19 2021-03-23 Carrier Corporation Compressor comprising a variable volume index valve

Also Published As

Publication number Publication date
EP2662569A1 (en) 2013-11-13
CN102042226B (zh) 2014-12-31
CN102042226A (zh) 2011-05-04
EP2662569A4 (en) 2016-07-13
IN2012DN04926A (zh) 2015-09-25
WO2012092739A1 (zh) 2012-07-12

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Date Code Title Description
AS Assignment

Owner name: SHANGHAI POWER TECH. SCREW MACHINERY CO., LTD., CH

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:TANG, YAN;REEL/FRAME:027863/0245

Effective date: 20120228

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION