WO2003019011A1 - Method for the protection of a volumetric liquid-injected compressor - Google Patents

Method for the protection of a volumetric liquid-injected compressor Download PDF

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Publication number
WO2003019011A1
WO2003019011A1 PCT/BE2002/000140 BE0200140W WO03019011A1 WO 2003019011 A1 WO2003019011 A1 WO 2003019011A1 BE 0200140 W BE0200140 W BE 0200140W WO 03019011 A1 WO03019011 A1 WO 03019011A1
Authority
WO
WIPO (PCT)
Prior art keywords
temperature
compressor element
limit value
compressor
motor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/BE2002/000140
Other languages
French (fr)
Inventor
Bart Anton Lode Talboom
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.)
Atlas Copco Airpower NV
Original Assignee
Atlas Copco Airpower NV
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 Atlas Copco Airpower NV filed Critical Atlas Copco Airpower NV
Publication of WO2003019011A1 publication Critical patent/WO2003019011A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • F04C28/28—Safety arrangements; Monitoring
    • 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
    • F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
    • F04C28/06—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids specially adapted for stopping, starting, idling or no-load operation
    • 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
    • F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
    • 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
    • F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
    • F04C29/0007—Injection of a fluid in the working chamber for sealing, cooling and lubricating
    • 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
    • F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
    • F04C29/04—Heating; Cooling; Heat insulation
    • F04C29/042—Heating; Cooling; Heat insulation by injecting a fluid

Definitions

  • This invention relates to a method for the protection of a volumetric liquid-injected compressor of the type comprising a compressor element driven by a motor, a pressure conduit connected to the compressor element, a separator for injection liquid erected in this pressure conduit, an injection conduit for injecting the separated injection liquid into the compressor element, and a cooler in this injection conduit, according to which method the outlet temperature of the compressed gas is measured and, depending on this temperature and on a limit value, it is determined whether the motor has to be stopped.
  • injection liquid for example, water
  • This injection liquid also serves as a sealing agent between the two rotors of the compressor element.
  • This liquid is discharged along with the compressed gas and separated from the gas in a separator or vessel and re-used for injection.
  • the internal cooling during compression fails, and the temperature of the compressed gas, when exiting the compressor element, immediately becomes very high. Depending on the internal pressure ratio of the compressor element, this temperature can reach 250 to 300°C.
  • a thermostatic valve in the injection conduit provides for that the compressor element reaches its normal temperature as soon as possible, which temperature can be set closely to the aforementioned limit value.
  • the injection temperature and, consequently, also the temperature of the compressed gas at the outlet of the compressor element depend on the environmental temperature. It is, in fact, desirable to keep the temperature of the injection water as low as possible in order to approach an isothermic compression as closely as possible. This has a favourable influence onto the energy output of the compression.
  • the invention in particular relates to such compressors without thermostatic regulation.
  • the present invention aims at offering a solution for the above-mentioned problem and at providing a method for protecting a volumetric compressor, in which said temperature peaks are avoided.
  • this problem is solved in a compressor as described in the first paragraph and with an air-cooled cooler in that also the environmental temperature in the proximity of the compressor element is measured and the limit value is rendered dependent on this environmental temperature.
  • the set protection temperature is variable and always is situated not much above the outlet temperature, major delays and temperature peaks will never occur.
  • the protection temperature dependent on the environmental temperature, it can be obtained that the protection works equally fast in the whole temperature range.
  • the cooler does not work optimum and the cooling air flow is hampered, as a result of which the air in the compressor housing is heated.
  • the environmental temperature or the temperature at the outlet of the cooler rises for the cooling liquid, the protection temperature, which depends thereupon, also will rise, which might lead to inacceptably high temperatures at the outlet of the compressor element.
  • the volumetric water-injected compressor with, thus, water as an injection liquid substantially consists of a compressor element l, a motor 2 driving this compressor element 1, a pressure conduit 3 which is connected to the compressor element 1 and in which successively a vessel which is a water separator 4 and a cooler 5 are erected, and an injection conduit 6, for returning the separated water and injecting it into the compressor element 1, in which a cooler 7 is erected.
  • the coolers 5 and 7 are air-cooled coolers with separate radiators 8 and 9, which are erected in the pressure conduit 3 and the injection conduit 6, respectively, and with a common fan 10.
  • the compressor comprises a protection against excessive temperatures which comprises an electronic control device 11 which controls the motor 2 and to which two temperature sensors 12 and 13 are connected.
  • the temperature sensor 12 is arranged at the outlet of the compressor element 1 in the pressure conduit 3, and the temperature sensor 13 is provided, for example, in the suction conduit 14 which connects to the compressor element 1, or in the immediate vicinity thereof.
  • the outlet temperature of the compressed gas, as well as the environmental temperature in the immediate vicinity of the compressor element 1, and in particular in the suction conduit 14, are measured by means of the temperature sensors, 12 and 13, respectively.
  • control device 11 By the control device 11, the difference between these two temperatures is determined and compared to a put-in limit value of the temperature difference. If this limit value is reached or exceeded, then the control device 11 stops the motor 2.
  • the protection level at which the motor 2 is stopped is closer to the normal value of the outlet temperature of the air, at the outlet of the compressor element, as a consequence of which the influence of a sudden temperature increase only results in a minor delay of the protection.
  • the control device 11 also adds said limit value for the temperature difference to a chosen limit value of the environmental temperature. The sum thereof provides an absolute limit and, when it is reached or exceeded, the control device 11 also commands the stopping of the motor 2.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)
  • Control Of Positive-Displacement Pumps (AREA)

Abstract

This invention relates to a method for the protection of a volumetric liquid-injected compressor of the type comprising a compressor element (1) driven by a motor (2), a pressure conduit (3), a separator (4) for injection liquid erected in this pressure conduit (3), an injection conduit (6) for injecting the separated injection liquid into the compressor element (1), and an air-cooled cooler (7) in this injection conduit (6). The outlet temperature of the compressed gas is measured and, depending on this temperature and on a limit value, it is determined whether the motor (2) has to be stopped. Also, the temperature in the vicinity of the compressor element (1) is measured and the limit value is rendered dependent on this environmental temperature.

Description

Method for the protection of a volumetric liquid-injected compressor.
This invention relates to a method for the protection of a volumetric liquid-injected compressor of the type comprising a compressor element driven by a motor, a pressure conduit connected to the compressor element, a separator for injection liquid erected in this pressure conduit, an injection conduit for injecting the separated injection liquid into the compressor element, and a cooler in this injection conduit, according to which method the outlet temperature of the compressed gas is measured and, depending on this temperature and on a limit value, it is determined whether the motor has to be stopped.
In such compressors, injection liquid, for example, water, is injected into the compressor element in order to lubricate and cool the rotor or rotors thereof. This injection liquid also serves as a sealing agent between the two rotors of the compressor element. This liquid is discharged along with the compressed gas and separated from the gas in a separator or vessel and re-used for injection.
When the injection fails or is too low, the internal cooling during compression fails, and the temperature of the compressed gas, when exiting the compressor element, immediately becomes very high. Depending on the internal pressure ratio of the compressor element, this temperature can reach 250 to 300°C.
Therefore, such compressors are protected by measuring the outlet temperature of the outgoing compressed gas and, if this temperature exceeds a certain fixed limit value, stopping the motor.
In most of the oil-injected volumetric compressors, a thermostatic valve in the injection conduit provides for that the compressor element reaches its normal temperature as soon as possible, which temperature can be set closely to the aforementioned limit value.
With compressors without such thermostatic valve, for example, water-injected compressors in which such valve in practice is not usual and desirable, the injection temperature and, consequently, also the temperature of the compressed gas at the outlet of the compressor element depend on the environmental temperature. It is, in fact, desirable to keep the temperature of the injection water as low as possible in order to approach an isothermic compression as closely as possible. This has a favourable influence onto the energy output of the compression.
The invention in particular relates to such compressors without thermostatic regulation.
When the outlet temperature of the compressed gas in a compressor, said cooler of which is air-cooled, suddenly starts to rise, this will be measured, with a certain delay, by a temperature sensor, and, also with a certain delay, a reaction upon this temperature increase will take place.
In particular if the environmental temperature is low, this may form a problem. In this case, the normal outlet temperature of the compressor element also is low, such that, with a sudden increase of this outlet temperature, the temperature measured by the temperature sensor will follow only slowly, which may lead to temperature peaks. With a high environmental temperature, this problem will occur less. The outlet temperature of the compressed gas then will be in the proximity of the set protection temperature. Sudden temperature increases only result in a limited delay, such that major temperature peaks will be avoided.
The present invention aims at offering a solution for the above-mentioned problem and at providing a method for protecting a volumetric compressor, in which said temperature peaks are avoided.
According to the invention, this problem is solved in a compressor as described in the first paragraph and with an air-cooled cooler in that also the environmental temperature in the proximity of the compressor element is measured and the limit value is rendered dependent on this environmental temperature.
By providing for that the set protection temperature is variable and always is situated not much above the outlet temperature, major delays and temperature peaks will never occur. By rendering the protection temperature dependent on the environmental temperature, it can be obtained that the protection works equally fast in the whole temperature range.
It is also recommended for liquid-injected compressors with an air-cooled cooler to maintain an absolute limit for the outlet temperature of the compressed gas.
It may, in fact, happen that that the cooler does not work optimum and the cooling air flow is hampered, as a result of which the air in the compressor housing is heated. As then the environmental temperature or the temperature at the outlet of the cooler rises for the cooling liquid, the protection temperature, which depends thereupon, also will rise, which might lead to inacceptably high temperatures at the outlet of the compressor element.
With the intention of better showing the characteristics of the invention, hereafter, as an example without any limitative character, a preferred form of embodiment is described, with reference to the accompanying drawings, wherein the figure schematically represents a volumetric water-injected screw-type compressor according to the invention.
The volumetric water-injected compressor with, thus, water as an injection liquid, as represented in the figure, substantially consists of a compressor element l, a motor 2 driving this compressor element 1, a pressure conduit 3 which is connected to the compressor element 1 and in which successively a vessel which is a water separator 4 and a cooler 5 are erected, and an injection conduit 6, for returning the separated water and injecting it into the compressor element 1, in which a cooler 7 is erected.
The coolers 5 and 7 are air-cooled coolers with separate radiators 8 and 9, which are erected in the pressure conduit 3 and the injection conduit 6, respectively, and with a common fan 10.
The compressor comprises a protection against excessive temperatures which comprises an electronic control device 11 which controls the motor 2 and to which two temperature sensors 12 and 13 are connected.
The temperature sensor 12 is arranged at the outlet of the compressor element 1 in the pressure conduit 3, and the temperature sensor 13 is provided, for example, in the suction conduit 14 which connects to the compressor element 1, or in the immediate vicinity thereof.
Protecting takes place as follows.
When the compressor is operating, the outlet temperature of the compressed gas, as well as the environmental temperature in the immediate vicinity of the compressor element 1, and in particular in the suction conduit 14, are measured by means of the temperature sensors, 12 and 13, respectively.
By the control device 11, the difference between these two temperatures is determined and compared to a put-in limit value of the temperature difference. If this limit value is reached or exceeded, then the control device 11 stops the motor 2.
In this manner, a limitation of the temperature increase or, in other words, a relative temperature limit is obtained.
As the protection is related to the environmental temperature, the protection level at which the motor 2 is stopped, for the entire range of operation or temperature range, is closer to the normal value of the outlet temperature of the air, at the outlet of the compressor element, as a consequence of which the influence of a sudden temperature increase only results in a minor delay of the protection.
The control device 11 also adds said limit value for the temperature difference to a chosen limit value of the environmental temperature. The sum thereof provides an absolute limit and, when it is reached or exceeded, the control device 11 also commands the stopping of the motor 2.
Therefore, there still is an absolute limit for the outlet temperature of the compressed gas. It is, in fact, possible that the flow of cooling air is hampered, as a result of which this latter is heated within the housing of the compressor, which might cause a deviation of said protection which is related to the environmental temperature.
For each type of cooler, there is, for a certain output, a certain ratio between the outlet temperature of the cooling water and that of the compressed gas at the outlet of the compressor element 1.
The present invention is in no way limited to the form of embodiment described as an example and represented in the figure; on the contrary, such method may be realized according to different variants, without leaving the scope of the invention.

Claims

Claims.
1.- Method for the protection of a volumetric liquid- injected compressor of the type comprising a compressor element (l) driven by a motor (2), a pressure conduit (3) connected to the compressor element (1), a separator (4) for injection liquid erected in this pressure conduit (3), an injection conduit (6) for injecting the separated injection liquid into the compressor element (1), and an air-cooled cooler (7) in this injection conduit (6), according to which method at least the outlet temperature of the compressed gas is measured and, depending on at least this temperature and on a limit value, it is determined whether the motor (2) has to be stopped, characterized in that also the temperature in the vicinity of the compressor element (1) is measured and the limit value is rendered dependent on this environmental temperature.
2.- Method according to claim 1, characterized in that the outlet temperature of the compressed gas, as well as the environmental temperature in the immediate vicinity of the compressor element (1) are measured, the difference between these two temperatures is determined and this difference is compared to a put-in limit value of the temperature difference, and, when this limit value is reached or exceeded, the motor (2) is- stopped.
3.- Method according to claim 2, characterized in that the environmental temperature is measured in the suction conduit (14).
4.- Method according to any of the preceding claims, characterized in that the protection additionally takes place in function of a set absolute limit for outlet temperature of the compressed gas.
5.- Method according to claims 2 and 4, characterized in that said limit value for the temperature difference is added to a chosen limit value of the environmental temperature, and that, when the motor (2) is stopped, the value of this sum is reached or exceeded, too.
PCT/BE2002/000140 2001-08-30 2002-08-29 Method for the protection of a volumetric liquid-injected compressor Ceased WO2003019011A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BE2001/0566A BE1014354A3 (en) 2001-08-30 2001-08-30 Method for protecting volumetric liquid injected compressor.
BE2001/0566 2001-08-30

Publications (1)

Publication Number Publication Date
WO2003019011A1 true WO2003019011A1 (en) 2003-03-06

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PCT/BE2002/000141 Ceased WO2003019010A1 (en) 2001-08-30 2002-08-29 Method for the protection of a volumetric liquid-injected compressor
PCT/BE2002/000140 Ceased WO2003019011A1 (en) 2001-08-30 2002-08-29 Method for the protection of a volumetric liquid-injected compressor

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PCT/BE2002/000141 Ceased WO2003019010A1 (en) 2001-08-30 2002-08-29 Method for the protection of a volumetric liquid-injected compressor

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WO (2) WO2003019010A1 (en)

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US11015602B2 (en) 2012-02-28 2021-05-25 Atlas Copco Airpower, Naamloze Vennootschap Screw compressor
BE1020312A3 (en) 2012-02-28 2013-07-02 Atlas Copco Airpower Nv COMPRESSOR DEVICE, AS WELL AS USE OF SUCH SET-UP.
BE1020311A3 (en) 2012-02-28 2013-07-02 Atlas Copco Airpower Nv SCREW COMPRESSOR.
CN103388584A (en) * 2013-07-29 2013-11-13 无锡方盛换热器制造有限公司 Radiator for reducing stress and trimmer pressure
CN104776028B (en) 2014-01-10 2017-08-29 阿特拉斯·科普柯空气动力股份有限公司 The method and the compressor of application this method condensed in the oil of anti-spraying oil formula compressor
RU2729967C2 (en) * 2016-04-06 2020-08-13 Битцер Кюльмашиненбау Гмбх Compressor module and method of operation of compressor module

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US4045973A (en) * 1975-12-29 1977-09-06 Heil-Quaker Corporation Air conditioner control
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JPH0443893A (en) * 1990-06-11 1992-02-13 Hitachi Ltd Ventilation control device
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US4034570A (en) * 1975-12-29 1977-07-12 Heil-Quaker Corporation Air conditioner control
US4045973A (en) * 1975-12-29 1977-09-06 Heil-Quaker Corporation Air conditioner control
US4502833A (en) * 1981-10-21 1985-03-05 Hitachi, Ltd. Monitoring system for screw compressor
JPH0443893A (en) * 1990-06-11 1992-02-13 Hitachi Ltd Ventilation control device
JPH1077980A (en) * 1996-08-30 1998-03-24 Ishikawajima Harima Heavy Ind Co Ltd Air compression equipment
US5884494A (en) * 1997-09-05 1999-03-23 American Standard Inc. Oil flow protection scheme

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Also Published As

Publication number Publication date
WO2003019010A8 (en) 2005-03-03
BE1014354A3 (en) 2003-09-02
WO2003019010A1 (en) 2003-03-06

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