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WO2009072129A1 - Pompe à vide pour l'injection d'un additif fluide dans une conduite de fluide sous pression - Google Patents

Pompe à vide pour l'injection d'un additif fluide dans une conduite de fluide sous pression Download PDF

Info

Publication number
WO2009072129A1
WO2009072129A1 PCT/IL2008/001583 IL2008001583W WO2009072129A1 WO 2009072129 A1 WO2009072129 A1 WO 2009072129A1 IL 2008001583 W IL2008001583 W IL 2008001583W WO 2009072129 A1 WO2009072129 A1 WO 2009072129A1
Authority
WO
WIPO (PCT)
Prior art keywords
fluid
stem
space
pin head
neck portion
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/IL2008/001583
Other languages
English (en)
Inventor
Dan Bron
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of WO2009072129A1 publication Critical patent/WO2009072129A1/fr
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
    • F04F—PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
    • F04F5/00—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow
    • F04F5/44—Component parts, details, or accessories not provided for in, or of interest apart from, groups F04F5/02 - F04F5/42
    • F04F5/46—Arrangements of nozzles
    • F04F5/461—Adjustable nozzles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04F—PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
    • F04F5/00—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow
    • F04F5/44—Component parts, details, or accessories not provided for in, or of interest apart from, groups F04F5/02 - F04F5/42
    • F04F5/48—Control

Definitions

  • the present invention relates to vacuum pumps, and more particularly to an automatic vacuum pump for the injection of fluid additive under low pressure, into a pressurized fluid line.
  • Vacuum pumps are common for the injection of fluid additive at ambient pressure into a pressurized fluid line, to be mixed with the fluid inside the line.
  • the line fluid flow traverses the pump body, shaped like two coaxial back-to-back funnels connected via a short neck.
  • the line fluid flow is accelerated under high pressure via the narrow neck and, upon reaching a critical speed, negative pressures develop about the internal periphery of the neck, to admit the additive from the outside, where the suction feeding means are located.
  • the main drawbacks of this device are the big pressure-drop that is required to propel the main line fluid flow via the neck to achieve and exceed the critical fluid flow speed and to sustain suction, and the fact that fluid passage in the neck fits only a narrow range of line fluid flowrates. Fluid flowrates on the low side of the range are insufficient to achieve suction, while fluid flowrates on the upper side of the range cause high pressure drop on the pump.
  • a vacuum pump for the injection of a fluid additive under low pressures, into a pressurized fluid line, comprising a body connectable inline to a main fluid line including two back-to-back inlet and outlet funnels delimiting an internal space having an axis, and defining a fluid inlet space, a fluid outlet space and a neck portion, interposed between and connecting, said funnels, a feeding port for introducing additive, being in fluid communication with the internal space about the neck portion, an elongated pin assembly, substantially coaxially guided and movable inside said outlet funnel, said pin assembly includes a pin head, protruding into and along at least part of the neck portion, to at least partially reduce the free fluid flow path in the neck portion, said pin head coaxially engages, and is freely slidable with respect to a stem, the other end of which stem being anchored to the pump body, said pin head and stem enclosing a control-space communicating with the fluid pressure in the internal space of the pump, via at least
  • Fig. 1 illustrates a cross-sectional view of an embodiment of an automatic vacuum pump, according to the present invention.
  • FIG. 1 a schematic representation of the preferred embodiment of the automatic vacuum pump 2, according to the present invention. Shown is a tubular body 4, coaxially housing all of the elements of the pump 2.
  • the body 4 is configured as two back-to-back funnels 6 and 8, comprising a fluid inlet 10 and a fluid outlet 12, respectively connectable inline to a main fluid line and defining a fluid inlet space and a fluid outlet space.
  • the funnels 6 and 8 are connected by a short cylindrical neck 14 at the downstream side of which, there is an annular suction groove 16, connected to a suction additive inlet port 18, constituting the additive feeder.
  • a pin assembly 20 Coaxially with the neck 14, there is located a pin assembly 20, commonly of a circular cross-section, having a tapered pin head 22, e.g., a conical edge, slidably coupled with a stem 24.
  • the downstream end of the stem 24 is anchored to the body 4 by a perforated flange 26 and a screw 28.
  • the pin head 22 and the stem 24 enclose an expandable control space 30 between them, which space is connectable to the fluid pressure inside the pump via a fluid flow-restricting, annular clearance, control port 32 and another small fluid flow control port 34.
  • the pin head 22 is coaxially guided in the outlet funnel 8 by a set of ribs 36.
  • a control port 38 communicates with the control space 30 via the bore 40 in the pin head 22.
  • the upstream end of the stem 24 has a plunger 42 fitted with a plunger head 44, coaxially protruding from the stem 24, configured to reciprocate along the bore 40 to interrupt communication between the control port 38 and the control space 30 along a selected sliding length of the pin head 22.
  • a fluid control port 46 made in the head tail portion 48 surrounding the annular clearance control port 32, to render a similar effect to that of the control port 34.
  • Fig. 1 further illustrates the pump 2 in a rest state.
  • the entire diameter of the pin head 22 blocks the fluid flow-path from the fluid inlet 10 through the neck 14.
  • the pin head 22 is pushed back under the dragging force of the mains fluid flow, until this force is equally opposed by the control force created in the control space 30.
  • the sliding of the tapered head stops and is held in position by two opposite equal forces: a) the flow drag of the main fluid line upon the pin head 22, loading downstream, and b) the pressure in the control space 30, loading upstream.
  • the incoming fluid flow drags the pin head 22 downstream at a force proportional to the fluid-flow speed.
  • This force has to be matched by an opposite pressure existing inside the pump that communicates with the control space 30 via control ports 32, and 34 or 46, to bias the rear surface of the pin head 22, upstream.
  • the control port 38 is blocked at the first sliding motion of the plunger head 44 and, is therefore neutralized. This is required for maintaining high bias pressure inside the control space 30 for low range flowrates. As the flowrates increase, lower bias is required, and therefore, upon the pin head 22 sliding downstream, the plunger head 44 will correspondingly move upstream along the bore 40 and clear the path for low pressure fluid introduced via port 38 to reach the control space 30.
  • control port 34 exposed to high pressure, will be blocked by the sliding of the head tail portion 48, overlapping the port 34.
  • the pin assembly 20 will retreat and stop in the position where the two forces acting on it will be equal, while keeping the free cross-section of the neck 14 at its optimal size for fluid suction under minimal pump pressure drop.
  • control space 30 with its flow-restricting control ports serves to effectively prevent possible axial vibrations of the pin head 22.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Details Of Reciprocating Pumps (AREA)

Abstract

L'invention concerne une pompe à vide (2) pour l'injection d'un additif fluide à basse pression dans une conduite de fluide sous pression. Le corps (4) peut être relié en ligne à une conduite de fluide principale comprenant : deux entonnoirs d'entrée et sortie dos à dos (6, 8) délimitant un espace interne et définissant un espace d'entrée de fluide (10), un espace de sortie de fluide (12) et une partie col (14), interposée entre les entonnoirs et les reliant ; un orifice d'alimentation (18) pour introduire un additif, en communication fluidique avec l'espace interne autour de la partie col ; et un ensemble broche allongé (20) coaxialement guidé et mobile à l'intérieur de l'entonnoir de sortie (8). L'ensemble broche comprend une tête de broche (22) faisant saillie dans et le long d'une partie de la partie col pour réduire partiellement le trajet d'écoulement de fluide libre dans la partie col. La tête de broche coopère de façon coaxiale avec une tige (24) et est librement coulissante par rapport à celle-ci, l'autre extrémité de la tige étant ancrée au corps de pompe. La tête de broche et la tige enferment un espace de commande (30) communiquant avec la pression de fluide dans l'espace interne de la pompe, par l'intermédiaire d'un orifice de commande de limitation d'écoulement de fluide (32, 34, 46, 38).
PCT/IL2008/001583 2007-12-05 2008-12-04 Pompe à vide pour l'injection d'un additif fluide dans une conduite de fluide sous pression Ceased WO2009072129A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IL187911A IL187911A0 (en) 2007-12-05 2007-12-05 An automatic vacuum pump
IL187911 2007-12-05

Publications (1)

Publication Number Publication Date
WO2009072129A1 true WO2009072129A1 (fr) 2009-06-11

Family

ID=40326304

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IL2008/001583 Ceased WO2009072129A1 (fr) 2007-12-05 2008-12-04 Pompe à vide pour l'injection d'un additif fluide dans une conduite de fluide sous pression

Country Status (2)

Country Link
IL (1) IL187911A0 (fr)
WO (1) WO2009072129A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105697428A (zh) * 2014-07-23 2016-06-22 蔡留凤 一种清洁性能好的可调射流真空泵
CN105822606A (zh) * 2014-07-23 2016-08-03 吴小再 一种射流真空泵的工作方法
DE112013000817B4 (de) * 2012-02-02 2019-05-09 Denso Corporation Ejektor
JP2020045764A (ja) * 2018-09-14 2020-03-26 富士電機株式会社 エジェクタ

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2946293A (en) * 1955-04-18 1960-07-26 Pyrene Co Ltd Inductors
US3511259A (en) * 1966-04-04 1970-05-12 Snecma Venturi pump for mixing two fluid streams within a large range of flow rates
US3721387A (en) * 1971-06-02 1973-03-20 United Aircraft Corp Ejector with variable mixing section and primary nozzle areas

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2946293A (en) * 1955-04-18 1960-07-26 Pyrene Co Ltd Inductors
US3511259A (en) * 1966-04-04 1970-05-12 Snecma Venturi pump for mixing two fluid streams within a large range of flow rates
US3721387A (en) * 1971-06-02 1973-03-20 United Aircraft Corp Ejector with variable mixing section and primary nozzle areas

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE112013000817B4 (de) * 2012-02-02 2019-05-09 Denso Corporation Ejektor
CN105697428A (zh) * 2014-07-23 2016-06-22 蔡留凤 一种清洁性能好的可调射流真空泵
CN105822606A (zh) * 2014-07-23 2016-08-03 吴小再 一种射流真空泵的工作方法
JP2020045764A (ja) * 2018-09-14 2020-03-26 富士電機株式会社 エジェクタ
JP7210953B2 (ja) 2018-09-14 2023-01-24 富士電機株式会社 エジェクタ

Also Published As

Publication number Publication date
IL187911A0 (en) 2008-11-03

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