WO2016181314A1 - Degassing pump - Google Patents

Degassing pump Download PDF

Info

Publication number
WO2016181314A1
WO2016181314A1 PCT/IB2016/052685 IB2016052685W WO2016181314A1 WO 2016181314 A1 WO2016181314 A1 WO 2016181314A1 IB 2016052685 W IB2016052685 W IB 2016052685W WO 2016181314 A1 WO2016181314 A1 WO 2016181314A1
Authority
WO
WIPO (PCT)
Prior art keywords
pump
liquid
pump according
inner chamber
previous
Prior art date
Application number
PCT/IB2016/052685
Other languages
French (fr)
Inventor
Maurizio Gastaldi
Original Assignee
Demak S.R.L.
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 Demak S.R.L. filed Critical Demak S.R.L.
Publication of WO2016181314A1 publication Critical patent/WO2016181314A1/en

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K25/00—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for
    • F01K25/08—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using special vapours
    • F01K25/10—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using special vapours the vapours being cold, e.g. ammonia, carbon dioxide, ether
    • F01K25/103—Carbon dioxide
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K23/00—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids
    • F01K23/02—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled
    • F01K23/06—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle
    • F01K23/10—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle with exhaust fluid of one cycle heating the fluid in another cycle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B13/00—Pumps specially modified to deliver fixed or variable measured quantities
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B15/00—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts
    • F04B15/06—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts for liquids near their boiling point, e.g. under subnormal pressure
    • F04B15/08—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts for liquids near their boiling point, e.g. under subnormal pressure the liquids having low boiling points
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B23/00—Pumping installations or systems
    • F04B23/02—Pumping installations or systems having reservoirs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/06—Venting

Definitions

  • the present invention relates to a pump for dosing a liquid, i.e. a substance which is typically in this state of matter at ambient pressure and temperature conditions.
  • this pump comprises:
  • US 4 523 903 A describes a dosing pump with a piston, in the cylinder of which the vacuum is avoided, and from which the dosed liquid comes out with a transverse direction of flow relative to the vertical axis of the piston.
  • the latter is also connected to a diaphragm, which in turn is fastened to the walls of a pre-dosing chamber, which is thus divided into two separate volumes.
  • US 5 819 544 A describes a pumping system for filling cylinders with evaporated, pressurized cryogenic liquid, particularly oxygen.
  • This system is provided with a vacuum pump for the complete evacuation of the cryogenic fluid present and any necessary purging. Consequently, the vacuum pump cannot operate during the normal operation of the cryogenic liquid pumping system.
  • An object of the present invention is therefore to overcome the aforesaid drawbacks of the known art. According to the invention, this object is achieved by means of a pump having the features indicated at the beginning of the present description and characterized in that it also includes a device for sucking from the aforesaid inner chamber, during the operation of the pump, gases and vapours which are released from the liquid.
  • the pump of the present invention performs not only its specific function of pumping and dosing the liquid, but also the function of degassing the liquid, with the advantage of making it unnecessary to have a further apparatus such as an intermediate reservoir intended specifically for the performance of this operation.
  • a further subject of the present invention is a method for dosing a liquid using the aforesaid pump, wherein said device sucks from the inner chamber, during the operation of the pump, gases and vapours which are released from the liquid.
  • FIG. 1 is a schematic representation of a pump of the invention
  • Figure 2 is a view in vertical section of the body of the pump of the invention.
  • Figure 3 is a representation on an enlarged scale of a detail of Figure 2.
  • the reference number 10 indicates the whole of a pump for dosing a liquid 12, this pump (Fig. 2) being provided with a substantially cylindrical body 14 with a circular cross section and a vertical central axis 16.
  • the body 10 is hollow, and delimits within itself a chamber 18 into which an inlet conduit 20 of the liquid 12 opens and from whose lower portion an outlet conduit 22 arranged along the axis 16 departs.
  • a check valve 24 is fitted on an extension of the outlet conduit 22.
  • the chamber 1 8 is also of cylindrical shape, except in its lower portion which is tapered in the form of a truncated cone.
  • a piston having a stem 26 and a head 28 which is slidable within the outlet conduit 22 is fitted within the chamber 18. Also the stem 26 is therefore positioned on the axis 16.
  • the stem 26 of the piston is fitted slidably within the inner chamber 1 8 which has a unitary inner volume, that is to say a volume not divided by a diaphragm or any separating partition.
  • the head 28 of the piston includes (Fig. 3) a pin 30 which departs from the lower end of the stem 26 and supports a disc 32 having a plurality of through holes 34 extending parallel to the axis 16.
  • the seal has a frustoconical profile with the flared end facing downwards.
  • the upper end of the stem 26. which protrudes outside the body 14 is connected to an actuator member which causes it to move in an alternating way along the axis 16.
  • a fixed spiral 42 is installed coaxially about the axis 16, in the upper portion of the chamber 1 8, from which portion there also departs a further conduit 44 which is provided with a shut-off valve 46 and which leads to a suction device, in particular a vacuum pump 48.
  • the chamber 1 8 is provided with a device 50 for controlling the level of the liquid 12, this device being capable of causing the opening of a valve 52 positioned on the liquid supply conduit when the level of the liquid falls below a first pre-established value, and of closing the valve when the liquid level reaches a second pre-established value.
  • the liquid 12 is supplied through the conduit 20 into the chamber 1 8 and, falling on an internally positioned member such as the spiral 42, is subjected to a mechanical degassing action.
  • the chamber 1 8 is at a pressure below atmospheric pressure, being at a pressure in the range from 50 to 20,000 Pa for example, because of the action of the vacuum pump 48, so that the pressure drop conditions further promote the release of dissolved gases and vapours from the liquid phase.
  • the degassed liquid 12 is collected in the lower portion of the chamber 1 8 and from there passes into the outlet conduit 22 by gravity.
  • the heel 38 of the seal 40 bears on the outer edge of the disc 32 (see Fig. 3), so that the liquid 12 can penetrate into the circumferential recess 36 and, through the holes 34 of the disc 32, pass beyond the seal 40, thus penetrating into the lower end portion of the conduit 22.
  • the dosing is very precise, since the liquid 12 is substantially free of dissolved gases and vapours as a result of the arrangements described above. It should be emphasized that the degassing action is performed by the pump itself, making it unnecessary to provide additional devices for this purpose.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
  • Separation By Low-Temperature Treatments (AREA)
  • Degasification And Air Bubble Elimination (AREA)
  • Compressor (AREA)

Abstract

The pump is intended for dosing a liquid (12) and comprises: a hollow body (14) delimiting an inner chamber (18) into which an inlet conduit (20) of the liquid (12) opens and from whose lower portion an outlet conduit (22) departs; a piston having a stem (26) and a head (28) slidable within the outlet conduit (22); and a device for sucking from the chamber (18) gases and vapours released from the liquid (12).

Description

Degassing pump
The present invention relates to a pump for dosing a liquid, i.e. a substance which is typically in this state of matter at ambient pressure and temperature conditions.
More particularly, this pump comprises:
- a hollow body delimiting an inner chamber into which an inlet conduit of the liquid opens and from whose lower portion an outlet conduit departs, and
- a piston having a stem and a head slidable within said outlet conduit.
To enable a pump of the aforesaid type to dose the liquid correctly, it is important to ensure that the liquid is free of dissolved gases.
For this purpose, the prior art provides for the installation, upstream of the pump, of a storage reservoir which is kept under vacuum, in order to promote the exit of any dissolved gases from the liquid phase. However, this plant-design solution is rather complex and expensive.
US 4 523 903 A describes a dosing pump with a piston, in the cylinder of which the vacuum is avoided, and from which the dosed liquid comes out with a transverse direction of flow relative to the vertical axis of the piston. The latter is also connected to a diaphragm, which in turn is fastened to the walls of a pre-dosing chamber, which is thus divided into two separate volumes.
US 5 819 544 A describes a pumping system for filling cylinders with evaporated, pressurized cryogenic liquid, particularly oxygen. This system is provided with a vacuum pump for the complete evacuation of the cryogenic fluid present and any necessary purging. Consequently, the vacuum pump cannot operate during the normal operation of the cryogenic liquid pumping system.
An object of the present invention is therefore to overcome the aforesaid drawbacks of the known art. According to the invention, this object is achieved by means of a pump having the features indicated at the beginning of the present description and characterized in that it also includes a device for sucking from the aforesaid inner chamber, during the operation of the pump, gases and vapours which are released from the liquid.
As a whole, the pump of the present invention performs not only its specific function of pumping and dosing the liquid, but also the function of degassing the liquid, with the advantage of making it unnecessary to have a further apparatus such as an intermediate reservoir intended specifically for the performance of this operation.
A further subject of the present invention is a method for dosing a liquid using the aforesaid pump, wherein said device sucks from the inner chamber, during the operation of the pump, gases and vapours which are released from the liquid.
Other advantages and features of the present invention will become clear from the following detailed description which is given by way of non-limiting example with reference to the attached drawings, in which:
Figure 1 is a schematic representation of a pump of the invention,
Figure 2 is a view in vertical section of the body of the pump of the invention, and
Figure 3 is a representation on an enlarged scale of a detail of Figure 2.
In Figure 1 , the reference number 10 indicates the whole of a pump for dosing a liquid 12, this pump (Fig. 2) being provided with a substantially cylindrical body 14 with a circular cross section and a vertical central axis 16.
The body 10 is hollow, and delimits within itself a chamber 18 into which an inlet conduit 20 of the liquid 12 opens and from whose lower portion an outlet conduit 22 arranged along the axis 16 departs. A check valve 24 is fitted on an extension of the outlet conduit 22. The chamber 1 8 is also of cylindrical shape, except in its lower portion which is tapered in the form of a truncated cone. A piston having a stem 26 and a head 28 which is slidable within the outlet conduit 22 is fitted within the chamber 18. Also the stem 26 is therefore positioned on the axis 16. As is clearly shown in the figures, the stem 26 of the piston is fitted slidably within the inner chamber 1 8 which has a unitary inner volume, that is to say a volume not divided by a diaphragm or any separating partition.
The head 28 of the piston includes (Fig. 3) a pin 30 which departs from the lower end of the stem 26 and supports a disc 32 having a plurality of through holes 34 extending parallel to the axis 16. A circumferential recess 36, into which an inwardly radially protruding heel 38 of an annular seal 40 is inserted with axial clearance, is therefore formed between the lower end of the stem 26 and the perforated disc 32. The seal has a frustoconical profile with the flared end facing downwards. In a known way, not illustrated in the figures, the upper end of the stem 26. which protrudes outside the body 14, is connected to an actuator member which causes it to move in an alternating way along the axis 16.
A fixed spiral 42 is installed coaxially about the axis 16, in the upper portion of the chamber 1 8, from which portion there also departs a further conduit 44 which is provided with a shut-off valve 46 and which leads to a suction device, in particular a vacuum pump 48.
In a known way , which is not described in detail, the chamber 1 8 is provided with a device 50 for controlling the level of the liquid 12, this device being capable of causing the opening of a valve 52 positioned on the liquid supply conduit when the level of the liquid falls below a first pre-established value, and of closing the valve when the liquid level reaches a second pre-established value.
In operation, the liquid 12 is supplied through the conduit 20 into the chamber 1 8 and, falling on an internally positioned member such as the spiral 42, is subjected to a mechanical degassing action. The chamber 1 8 is at a pressure below atmospheric pressure, being at a pressure in the range from 50 to 20,000 Pa for example, because of the action of the vacuum pump 48, so that the pressure drop conditions further promote the release of dissolved gases and vapours from the liquid phase. The degassed liquid 12 is collected in the lower portion of the chamber 1 8 and from there passes into the outlet conduit 22 by gravity. When the piston is drawn back upwards, the heel 38 of the seal 40 bears on the outer edge of the disc 32 (see Fig. 3), so that the liquid 12 can penetrate into the circumferential recess 36 and, through the holes 34 of the disc 32, pass beyond the seal 40, thus penetrating into the lower end portion of the conduit 22.
Subsequently, when the piston is lowered, the heel 38 of the seal comes to bear against the lower end of the stem 26, while the lower edge of the seal 40 forms a seal against the walls of the outlet conduit 22. In this configuration, the liquid 12 that has penetrated into the lower end portion of the conduit 22 is expelled by the piston which is lowered, and the liquid is thus dosed. As the figures clearly show, the direction of flow of the dosed liquid 12 coming out from the pump 10 through the conduit 22 is parallel to the axis 16.
The dosing is very precise, since the liquid 12 is substantially free of dissolved gases and vapours as a result of the arrangements described above. It should be emphasized that the degassing action is performed by the pump itself, making it unnecessary to provide additional devices for this purpose.
Naturally, the principle of the invention remaining the same, the details of construction and the forms of embodiment may be varied widely with respect to those described, which have been given purely by way of example, without thereby departing from the scope of the invention as defined in the attached claims.

Claims

1 . Pump for dosing a liquid ( 12), comprising:
- a hollow body ( 14) delimiting an inner chamber ( 1 8) into which an inlet conduit (20) of the liquid ( 12) opens and from whose lower portion an outlet conduit (22) departs, and
- a piston having a stem (26) and a head (28) slidable within said outlet conduit (22),
said pump being characterized in that it also includes a device for sucking from said chamber ( 1 8), during the operation of the pump, gases and vapours which are released from the liquid ( 12).
2. Pump according to Claim 1 . wherein a member, on which the supplied liquid ( 12) falls, is arranged in the upper portion of said chamber ( 18).
3. Pump according to Claim 2, wherein said member is a fixed spiral (42).
4. Pump according to any one of the previous claims, wherein said device for sucking is a vacuum pump (48).
5. Pump according to Claim 4, wherein a further conduit (44) departing from the upper portion of said inner chamber ( 18) leads to the vacuum pump (48).
6. Pump according to Claim 5, wherein said further conduit (44) directly connects said inner chamber ( 1 8) to the vacuum pump (48).
7. Pump according to any one of the previous claims, wherein the head (28) of said piston includes a pin (30) that departs from the lower end of the stem (26) and carries a perforated disk (32), so that a circumferential recess (36), into which an inwardly radially protruding heel (38) of an annular seal (40) having a frustoconical shape is inserted with axial clearance, is formed between said lower end of the stem (26) and said disc (32).
8. Pump according to any one of the previous claims, wherein said inner chamber ( 1 8) is of cylindrical shape, except in its lower portion which is tapered in the form of a truncal- ed cone.
9. Pump according to any one of the previous claims, wherein said inner chamber ( 1 8) has no opening which would allow the return of the discharged liquid ( 12) into the inner chamber ( 1 8).
10. Pump according to any one of the previous claims, wherein said hollow body ( 14) has a vertical central axis ( 16) which is parallel to the direction of flow of the dosed liquid ( 12) coming out from the pump through the outlet conduit (22).
1 1 . Pump according to any one of the previous claims, wherein the stem (26) of the piston is slidably mounted within said inner chamber ( 1 8) whose inner volume is unitary.
12. Method for dosing a liquid using a pump according to any one of the previous claims, wherein said device sucks from the inner chamber ( 1 8), during the operation of the pump, gases and vapours which are released from the liquid ( 12).
PCT/IB2016/052685 2015-05-12 2016-05-11 Degassing pump WO2016181314A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITUB2015A000622A ITUB20150622A1 (en) 2015-05-12 2015-05-12 Degassing pump
IT102015000014792 2015-05-12

Publications (1)

Publication Number Publication Date
WO2016181314A1 true WO2016181314A1 (en) 2016-11-17

Family

ID=53900973

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2016/052685 WO2016181314A1 (en) 2015-05-12 2016-05-11 Degassing pump

Country Status (2)

Country Link
IT (1) ITUB20150622A1 (en)
WO (1) WO2016181314A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2019138300A (en) * 2018-02-14 2019-08-22 ダンフォス パワー ソリューションズ ゲーエムベーハー ウント コンパニ オーハーゲーＤａｎｆｏｓｓ Ｐｏｗｅｒ Ｓｏｌｕｔｉｏｎｓ ＧｍｂＨ＆Ｃｏ．ＯＨＧ Method and device for venting suction side of synthetically commutated hydraulic pump

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH591068A5 (en) * 1975-04-07 1977-08-31 Schweizer Walter Measuring and degassing press for viscous fluids - uses ventilated dispenser with vacuum extraction of air bubbles for printing ink etc.
EP0316537A1 (en) * 1987-11-13 1989-05-24 Grünbeck Wasseraufbereitung GmbH Dosing pump
DE4017797A1 (en) * 1989-06-28 1991-01-10 Naka Liquid Control Ltd LIQUID PUMP AND MEASURING DEVICE

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH591068A5 (en) * 1975-04-07 1977-08-31 Schweizer Walter Measuring and degassing press for viscous fluids - uses ventilated dispenser with vacuum extraction of air bubbles for printing ink etc.
EP0316537A1 (en) * 1987-11-13 1989-05-24 Grünbeck Wasseraufbereitung GmbH Dosing pump
DE4017797A1 (en) * 1989-06-28 1991-01-10 Naka Liquid Control Ltd LIQUID PUMP AND MEASURING DEVICE

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2019138300A (en) * 2018-02-14 2019-08-22 ダンフォス パワー ソリューションズ ゲーエムベーハー ウント コンパニ オーハーゲーＤａｎｆｏｓｓ Ｐｏｗｅｒ Ｓｏｌｕｔｉｏｎｓ ＧｍｂＨ＆Ｃｏ．ＯＨＧ Method and device for venting suction side of synthetically commutated hydraulic pump

Also Published As

Publication number Publication date
ITUB20150622A1 (en) 2016-11-12

Similar Documents

Publication Publication Date Title
JP2013027783A5 (en)
JP2011021604A5 (en)
RU2012101222A (en) SYSTEM AND METHOD FOR REMOVING MATERIAL, FOAM FORMING SYSTEM AND DEVICE FOR CONVERTING FOAM TO LIQUID
RU2012104018A (en) VENTILATION VALVE (OPTIONS)
WO2016181314A1 (en) Degassing pump
US20160377074A1 (en) Runaway valve system for a pump
US20170058849A1 (en) High pressure fuel pump
EP2740684B1 (en) Retaining valve and liquid vessel
WO2017164747A8 (en) Hydrocarbon-water separator
EP2708710A3 (en) Fluid distribution system and components thereof
GB201213721D0 (en) Methods of configuring a vortex flow control device and a vortex flow control device
JP7022927B2 (en) Deaerator
MX2018015088A (en) An oil dehydrator, a system for dehydrating oil comprising an oil dehydrator and a method for dehydrating oil with an oil dehydrator.
US9782695B2 (en) De-aeration device for a hydraulically actuated variable valve actuation system
SE541197C2 (en) Venting device at a reservoir for a hydraulic system
CN105201862A (en) Automatic liquid pouring device of liquid transfer pump
JP6831301B2 (en) Interaction device
EP4006395B1 (en) Fluid device
CN103244437B (en) There is vacuum and keep the high speed drain turbine synchronous discharging-suction pump of function
CN107399438A (en) Liquid storage container and its assembly method and unmanned plane
JP2009257296A (en) Pump device
JP6037810B2 (en) Gas exhaust device
US9182050B2 (en) Piston cap with center vent
CN208457432U (en) Liquid deceleration buffer device
RU2017144625A (en) FEEDING UNIT FOR THE DEVICE FOR PREPARING A DRINK AND THE DEVICE CONTAINING THIS FEEDING UNIT

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 16731657

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 16731657

Country of ref document: EP

Kind code of ref document: A1