WO1993001396A1 - Appareil de refroidissement servant a recycler l'agent de compression d'une pompe a vide - Google Patents

Appareil de refroidissement servant a recycler l'agent de compression d'une pompe a vide Download PDF

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Publication number
WO1993001396A1
WO1993001396A1 PCT/AU1992/000326 AU9200326W WO9301396A1 WO 1993001396 A1 WO1993001396 A1 WO 1993001396A1 AU 9200326 W AU9200326 W AU 9200326W WO 9301396 A1 WO9301396 A1 WO 9301396A1
Authority
WO
WIPO (PCT)
Prior art keywords
reservoir
suction
pump
liquid
line
Prior art date
Application number
PCT/AU1992/000326
Other languages
English (en)
Inventor
Neville Stephen Maley
Neil Ronald Buck
Original Assignee
Polar Vac International Inc.
Polar Vac Pty 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 Polar Vac International Inc., Polar Vac Pty Ltd. filed Critical Polar Vac International Inc.
Publication of WO1993001396A1 publication Critical patent/WO1993001396A1/fr

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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
    • F04C19/00—Rotary-piston pumps with fluid ring or the like, specially adapted for elastic fluids
    • F04C19/004—Details concerning the operating liquid, e.g. nature, separation, cooling, cleaning, control of the supply

Definitions

  • TITLE Cooling Apparatus for recirculating vacuum pump compressant DESCRIPTION
  • the present invention relates to a cooling apparatus for circulating vacuum pump compressant.
  • liquid-ring pump At present, in applications where a vacuum pump is used and there is some chance of particulate matter entering the pump a liquid-ring pump is most suitable. This is due to the liquid compressant located therein cushioning the impact of the incoming matter.
  • the liquid-ring pumps can operate under conditions wherein there is either self-contained compressant located within the pump, recirculation of compressant through the pump or simply a single-passage of compressant through the pump.
  • a further factor that should be considered is the potential cost of compressant. Accordingly, the most suitable liquid-ring pump for many applications is one in which the compressant is wholly or partially recirculated through the pump.
  • a heat exchanger external to the pump is required to accept heat from the recirculating compressant that is generated by the conversion of mechanical energy into heat of compression.
  • the heat exchanger usually requires coolant to be pumped in and out involving a further item in addition to the pump and a recirculation o separator tank for the compressant.
  • heat may simply be allowed to dissipate from the pump and separator tank. Both effects are undesirable and lead to inefficiency in the size and the pumping capacity of the pump.
  • a liquid ring pump having a 3200 cubic metre capacity at 10°C has only a 1280 cubic metre capacity at 50°C.
  • the present invention has particular relevance to the operation of suction cleaning systems of the type comprising an air suction pump, a relatively coarse filter or settling tank located in a suction line upstream of the pump and a separator in a discharge line downstream of the pump wherein the pump is a vacuum pump.
  • a vacuum pump of the gear or lobe type are susceptible to damage from particles of grit or dirt.
  • a liquid-ring pump is best suited to these conditions.
  • Suction cleaning systems are often truck or trailer mounted. To enhance their portability a recirculation or separator for pump compressant is generally housed on board. Because of obvious size restrictions this tank has a limited volume. As a result, the compressant may potentially heat very quickly when the pump is operating and should be changed regularly.
  • the present invention provides a cooling apparatus for recirculating vacuum pump compressant that allows the efficient cooling of the recirculating compressant through use of the air being pumped and a liquid reservoir.
  • a cooling apparatus for recirculating vacuum pump compressant comprising a liquid reservoir located upstream of an air-suction pump in a suction line and a separator tank containing a volume of compressant located downstream of the air-suction pump in a discharge line, the separator tank having at least part thereof in contact with the liquid reservoir and a recirculation line extending from the separator tank to the pump to recirculate compressant whereby heat from the separator may be transferred to the liquid reservoir.
  • the suction line feeds into the liquid reservoir in such a manner that incoming air at least disturbs the liquid therein.
  • a suction cleaning system comprising an air suction pump, a liquid reservoir located in a suction line upstream of the pump, a coarse filter or settling tank further upstream in the suction line, a separator tank containing a volume of compressant located in a discharge line downstream of the pump and being at least partially in contact with the liquid reservoir, and a recirculation line extending from the separator tank to the pump to recirculate compressant whereby heat may be transferred from the separator tank to the liquid reservoir.
  • the liquid in the liquid reservoir is in intimate contact with at least a portion of the tank.
  • Figure 1 is a schematic representation of a cooling apparatus for recirculating vacuum pump compressant in accordance with the present invention
  • Figure 2. is a schematic representation of the cooling apparatus of Figure 1 incorporating an extension to the separator tank;
  • FIG 3 is a schematic representation of a suction cleaning system incorporating the cooling apparatus of Figure 1. DESCRIPTION OF THE INVENTION
  • FIG. 1 there is shown a cooling apparatus 10 comprising a liquid reservoir 12 and a separator tank 14.
  • a suction line 16 extends from an area upstream to which suction is being applied to the liquid reservoir 12.
  • the liquid reservoir 12 houses a volume of liquid 18.
  • the suction line 16 introduces air and any contaminants contained therein into the liquid 18 in the reservoir 12 creating bubbles 20.
  • the separator tank 14 has a lid 22 and an open vent 24.
  • a volume of compressant 26 is contained within the separator tank 14.
  • the separator tank 14 is contained within the reservoir 12 and is in contact with the liquid 18 therein.
  • a suction line 28 leads from a point in the reservoir 12 above the liquid 18 to a vacuum pump 30.
  • the pump 30 has a discharge line 32 communicating with the separator tank 14.
  • the discharge line 32 enters the separator tank 14 at a point above the level of compressant 26 as shown in Figure 1.
  • a recirculation line 34 communicates between the separator tank 14 and the pump 30.
  • the recirculation line 34 allows passage of the compressant 26 from the separator tank 14 to the pump 30.
  • a compressant feed pump 36 is provided in the recirculation line 34.
  • a cooling apparatus 50 substantially similar to the cooling apparatus 10 and like numerals denote like parts.
  • the reservoir 12 has provided therein a ball-float valve 52 positioned so as close to the suction line 28 if the level of liquid 18 increases excessively.
  • the suction line 28 has provided therein both an on-off valve 54 and a non-return valve 56.
  • the non-return valve 56 is located down-stream of the standard valve 54.
  • a bypass line 58 joins the suction line 28 downstream of the non-return valve 56.
  • the bypass line 58 has provided therein an on-off valve 60.
  • the discharge line 32 has provided therein a radiator 62 with an associated fan 64 upstream of the separator tank 14.
  • the separator tank 14 further comprises a heat transfer element 66 located before the recirculation line 34.
  • the element 66 is fed compressant 26 through a feed line 68.
  • the feed line 68 has provided therein the compressant feed pump 36.
  • the bulk of the separator tank 14 is therefore located in position remote to the reservoir 12 but has an extension thereof, the heat transfer element 66 located within the reservoir 12.
  • the heat transfer element 66 comprises a number of coils 70 preferably positioned along the level of the liquid 18 in the reservoir 12 as shown in Figure 2.
  • the separator tank 14 also has provided extending therefrom below the level of compressant 26 a flushing line 72 in which is located an on-off valve 74.
  • the flushing line 72 projects into and terminates in the reservoir 12 at a point above the level of liquid 18.
  • the portion of the flushing line 72 within the reservoir 12 has provided therein a plurality of apertures 76.
  • FIG 3 there is shown a suction cleaning system 100 incorporating a cooling apparatus 102 substantially similar to cooling apparatus 10 and cooling apparatus 50 and like numerals denote like parts.
  • the bypass line 58 extends from the suction line 28 to a settling or holding tank 104.
  • the holding tank 104 has provided thereon a suction inlet line 106.
  • the suction line 16 extends upstream from the reservoir 12 to the holding tank 104.
  • the holding tank 104 has a collection of large sized matter 108 that has settled therein by gravity after entering through the suction inlet line 106.
  • valve 110 is provided in the suction inlet line 106.
  • valve 74 of cooling apparatus 50 is located at the base of the separator 14 in cooling apparatus 102. They are equivalent in that they both provide direct access between the separator 14 and the reservoir 12.
  • the pump 30 creates a suction force through the suction line 28. This suction force is transferred to the reservoir 12 causing air and any contaminants contained therein to be drawn into the liquid 18 through the inlet line 16. The air being drawn into the liquid 18 creates bubbles 20 in the liquid 18. A proportion of any contamination in the air may be removed therefrom at this stage and remain in the liquid 18. Any remaining contaminant is very fine particulate matter and may be evacuated from the reservoir 12 through the suction line 28 where it is introduced into the pump 30.
  • the pump 30 is a liquid ring pump having a vane rotor eccentrically mounted within a casing.
  • the casing is partially filled with compressant 26 which, when the rotor is driven, forms an annular layer between the casing and the tips of the vanes of the rotor thereby forming a seal.
  • the seal is achieved between the vanes and the casing without the vanes having to contact the casing.
  • the mix of air and fine particulate matter enter the pump 30 from the suction line 28 where the fine matter does not inhibit operation of the pump 30.
  • a mixture of air, any fine matter present and droplets of compressant 26 are discharged from the pump 30 through the discharge line 32 to the separator tank 14.
  • the fine matter will settle at the bottom thereof whereas the air may be exhausted through the vent 24 to atmosphere.
  • the droplets of compressant 26 fall to join the body of compressant 26 in the separator tank 14.
  • the compressant 26 in the separator tank 14 is recirculated to the pump 30 through the recirculation line 34 aided by the feed pump 36.
  • the separator tank 14 may have provided thereon a "heat sink” arrangement, such as a number of vanes, also. It is envisaged that additional compressant 26 may need to be added to the separator tank 14 either due to evaporatio or if the system is a partial recovery system.
  • the liquid 18 in the reservoir may simply be water, another coolant, or a combination thereof.
  • cooling apparatus 50 there are a number of additional characteristics to be noted, as is best seen in Figure 2.
  • valve 60 and 74 are closed. As before, the suction line 28 transfers the suction from the pump 30 to the reservoir 12 and so on upstream to the suction line 16.
  • the mixture of air, any fine particulate matter present and droplets of compressant 26 discharged from the pump 30 pass through the discharge line 32 to the radiator 62 and fan 64. At this stage an amount of heat is released from the compressant 26 before entering the separator tank 14.
  • the compressant 26 in the separator tank 14 is then recirculated to the pump 30 through the feed line 68 aided by the feed pump 36.
  • the compressant 26 passes through the heat transfer element 66 and coils 70 before entering the recirculation line 34 and finally re-entering the pump 30.
  • a considerable amount of heat is transferred from the compressant 26 in the coils 70 to the liquid 18.
  • the suction cleaning system 100 and cooling apparatus 102 is substantially similar to that of cooling apparatus 10 and cooling apparatus 50.
  • the cooling apparatus 50 and 102 can both be used in a suction cleaning system of the type described and the operation thereof will be apparent to the skilled addressee.
  • the pump 30 creates a suction force through suction line 28 as described previously but with reference to Figure 3.
  • valves 5 ' 4,56 and 110 are open whereas valves 60 and 74 are closed.
  • the suction line 28 transfers the suction force to the reservoir 12. Air bubbles through the liquid 18 in the reservoir 12 from the suction line 16 running from the holding tank 104. In turn, the suction force is transferred from the holding tank 104 to the suction inlet line 106.
  • Air containing the smaller matter is bubbled through the liquid 18 where much of it is removed from the air. Any remaining matter is very fine particulate matter and may be evacuated from the filter tank through the suction line 28.
  • the suction line 28 leads this mixture to the pump 30.
  • the mix of air and fine particulate matter enter the pump 30 from the suction line 28 where the fine matter does not inhibit operation fo the pump 30.
  • a mixture of air, fine matter and droplets of compressant are discharged from the pump 30 through the discharge line 32 to the separator tank 14. From the separator tank 14 the fine matter will settle at - li ⁇ the bottom thereon whereas the air may be exhausted through the vent 24 to atmosphere.
  • Compressant 26 from the separator tank 14 is returned to the pump 30 through the recirculation line 34 aided by the feed pump 36.
  • valves 54,56 and 110 may be closed and valves 60 and 74 opened. This causes the suction force from the pump 30 to be transferred to the holding tank 104. From the holding tank 104 the suction draws the liquid 18 and compressant 26 and any filtrate from the reservoir 12 and separator tank 14 through suction line 16 into the holding tank 104. It is far easier to clean only the holding tank 104 than the reservoir 12 and separator tank 14 also. This reduces the haphazard depositing of wastes after cleaning and greatly increases safety for an operator and any onlookers if working with toxic materials such as caustic soda or asbestos.
  • the holding tank 104 may have provided therein a mesh filter and a ball-float valve at the point where the suction line 16 exits therefrom.
  • a spray jet may be provided in the suction line 16 to dampen any incoming contaminants and thereby increase the efficiency of contaminant removal by the fluid 18.
  • the cooling apparatus of the present invention eliminates the need for an external heat exchange by providing the reservoir 12 and liquid 18 therein to draw heat from the compressant 26. This provides a pump able to operate for longer periods at high efficiency while allowing a compact system without the need for an external heat exchange. It is further envisaged that the radiator 62 or similar heat transfer device may be positioned at a point other than the discharge line 32.
  • the suction cleaning system 100 provides a truck or trailer mountable cleaning system that is able to run for longer periods at a greater efficiency and efficacy due to its cooling of pump water, is space economic and at least partially self cleaning. Modifications and variations such as would be apparent to a skilled addressee are deemed within the scope of the present invention.

Abstract

Un appareil de refroidissement (10), servant à refroidir l'agent de compression (26) d'une pompe à vide (30) à anneau liquide, comprend un réservoir de liquide fermé (12) situé en amont d'une conduite d'aspiration (28) menant vers la pompe (30), et une cuve de séparation (14) contenant un certain volume d'un agent de compression (26) situé en aval par rapport à la pompe (30), sur la conduite d'évacuation (32). Au moins une partie de la cuve de séparation (14) est en contact avec le liquide (18) dans le réservoir (12), et une conduite de recyclage (34) s'étend de la cuve de séparation (14) vers la pompe (30) afin de faire circuler à nouveau l'agent de compression (26), et de transférer ainsi la chaleur provenant de la cuve de séparation vers le liquide (18) dans le réservoir (12). En outre, la conduite d'aspiration d'arrivée (16) alimente le réservoir (12) en liquide, de sorte qu'une plus grande quantité de chaleur, et une partie de toute matière particulaire dans le courant d'aspiration vers la pompe (30), sont enlevées.
PCT/AU1992/000326 1991-07-03 1992-07-02 Appareil de refroidissement servant a recycler l'agent de compression d'une pompe a vide WO1993001396A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
AUPK7024 1991-07-03
AUPK702491 1991-07-03
AUPK8425 1991-09-18
AUPK842591 1991-09-18

Publications (1)

Publication Number Publication Date
WO1993001396A1 true WO1993001396A1 (fr) 1993-01-21

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AU1992/000326 WO1993001396A1 (fr) 1991-07-03 1992-07-02 Appareil de refroidissement servant a recycler l'agent de compression d'une pompe a vide

Country Status (1)

Country Link
WO (1) WO1993001396A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1169550A2 (fr) * 1999-03-22 2002-01-09 David Muhs Assemblage de pompe et composants associes
US6692234B2 (en) 1999-03-22 2004-02-17 Water Management Systems Pump system with vacuum source
US7311335B2 (en) 1999-03-22 2007-12-25 Water Management Systems Trailer and fuel tank assembly
US8998586B2 (en) 2009-08-24 2015-04-07 David Muhs Self priming pump assembly with a direct drive vacuum pump
CN112096610A (zh) * 2020-09-24 2020-12-18 淄博双环真空泵厂 一种水环真空泵冷却辅助装置

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE908658C (de) * 1950-09-15 1954-04-08 Burckhardt Ag Maschf Fluessigkeitsringpumpe
US4359313A (en) * 1980-03-10 1982-11-16 The Nash Engineering Company Liquid ring pump seal liquid chiller system
DE3204784A1 (de) * 1982-02-11 1983-08-25 Siemens AG, 1000 Berlin und 8000 München Fluessigkeitsringvakuumpumpe mit vorgeschaltetem vorverdichter
SU1566085A1 (ru) * 1988-04-04 1990-05-23 Предприятие П/Я А-3634 Жидкостно-кольцева машина
DE4036516A1 (de) * 1989-11-20 1991-05-23 Kulmbacher Klimageraete Fluessigkeitsringpumpe

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE908658C (de) * 1950-09-15 1954-04-08 Burckhardt Ag Maschf Fluessigkeitsringpumpe
US4359313A (en) * 1980-03-10 1982-11-16 The Nash Engineering Company Liquid ring pump seal liquid chiller system
DE3204784A1 (de) * 1982-02-11 1983-08-25 Siemens AG, 1000 Berlin und 8000 München Fluessigkeitsringvakuumpumpe mit vorgeschaltetem vorverdichter
SU1566085A1 (ru) * 1988-04-04 1990-05-23 Предприятие П/Я А-3634 Жидкостно-кольцева машина
DE4036516A1 (de) * 1989-11-20 1991-05-23 Kulmbacher Klimageraete Fluessigkeitsringpumpe

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
DERWENT ABSTRACT, Accession No. 91-034802/05, Class Q56; & SU,A,1 566 085 (MAKSIMOV), 23 May 1990. *

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1169550A2 (fr) * 1999-03-22 2002-01-09 David Muhs Assemblage de pompe et composants associes
EP1169550A4 (fr) * 1999-03-22 2003-11-19 David Muhs Assemblage de pompe et composants associes
US6692234B2 (en) 1999-03-22 2004-02-17 Water Management Systems Pump system with vacuum source
US7011505B2 (en) 1999-03-22 2006-03-14 Water Management Systems Pump system with vacuum source
US7311335B2 (en) 1999-03-22 2007-12-25 Water Management Systems Trailer and fuel tank assembly
US8998586B2 (en) 2009-08-24 2015-04-07 David Muhs Self priming pump assembly with a direct drive vacuum pump
CN112096610A (zh) * 2020-09-24 2020-12-18 淄博双环真空泵厂 一种水环真空泵冷却辅助装置

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