EP2635816B1 - Ejector and method - Google Patents

Ejector and method Download PDF

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Publication number
EP2635816B1
EP2635816B1 EP11782465.6A EP11782465A EP2635816B1 EP 2635816 B1 EP2635816 B1 EP 2635816B1 EP 11782465 A EP11782465 A EP 11782465A EP 2635816 B1 EP2635816 B1 EP 2635816B1
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EP
European Patent Office
Prior art keywords
fluid
ejectors
flow
ejector
motive
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.)
Active
Application number
EP11782465.6A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2635816A2 (en
Inventor
Gary Short
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Transvac Systems Ltd
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Transvac Systems Ltd
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Filing date
Publication date
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Publication of EP2635816A2 publication Critical patent/EP2635816A2/en
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Publication of EP2635816B1 publication Critical patent/EP2635816B1/en
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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
    • F04F5/02—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow the inducing fluid being liquid
    • F04F5/10—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow the inducing fluid being liquid displacing liquids, e.g. containing solids, or liquids and elastic fluids
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D3/00—Axial-flow pumps
    • 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
    • F04F5/463—Arrangements of nozzles with provisions for mixing
    • 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
    • F04F5/466—Arrangements of nozzles with a plurality of nozzles arranged in parallel

Definitions

  • the present invention relates to ejectors and to a method of ejecting a fluid.
  • the invention relates to ejectors suitable for locating in an underwater environment.
  • Ejectors employ a high pressure fluid (the 'motive') to compress low pressure fluid ('entrained' fluid or 'suction' fluid) to an intermediate pressure. The fluid at intermediate pressure is then ejected from the ejector as a 'discharge' fluid.
  • a high pressure fluid the 'motive'
  • low pressure fluid 'entrained' fluid or 'suction' fluid
  • FIG. 1 is a schematic illustration of a known ejector 1.
  • the ejector 1 has a motive inlet 10 through which a motive fluid may enter the ejector 1.
  • the motive fluid may be pumped by a pump (not shown) through the motive inlet 10.
  • the velocity of the motive fluid is increased as it passes through a nozzle portion 40 of the ejector 1 before being injected through an outlet aperture 44 of the nozzle portion 40 at an apex of the nozzle portion 40 into an inlet aperture 52 of a diffuser portion 50.
  • the diffuser portion 50 provides a fluid conduit in the form of a Venturi. That is, a diameter of the conduit initially decreases along a length of the diffuser portion 50 to a diameter less than that of the inlet aperture 52 before increasing in diameter towards an outlet aperture 54 of the diffuser portion 50.
  • the outlet aperture 44 of the nozzle portion 40 and the inlet aperture 52 of the diffuser portion 50 are in fluid communication with a suction fluid inlet 20 of the ejector 1.
  • the ejector 1 is arranged such that a flow of motive fluid out from the nozzle portion outlet aperture 44 and into the diffuser portion 50 creates a drop in pressure at the suction fluid inlet 20 such that suction fluid is drawn into the diffuser portion 50 through the suction fluid inlet 20, becoming entrained in the flow of motive fluid through the diffuser portion 50.
  • the diffuser portion 50 is arranged to mix the motive and suction fluids and reduce a flow velocity of the fluids thereby increasing a pressure of the fluids. It is to be understood that this is a reverse process to that occurring in the nozzle portion 40 where an increase in motive fluid velocity occurs thereby reducing a pressure of the motive fluid as it exits the nozzle portion 40 through outlet aperture 44.
  • Ejectors such as the ejector 1 of FIG. 1 are useful in pumping fluids that may have relatively large amounts of solids contained therein such as suspensions or slurries. Such fluids may be pumped using a motive fluid that has no solids suspended therein or at least a relatively small amount of solids.
  • the motive fluid may be a liquid or a gas or any other suitable fluid.
  • the suction fluid may be a liquid or a gas or any other suitable fluid.
  • Ejectors have the advantage that they may be fabricated without moving parts and may therefore enjoy a substantially longer service life than conventional mechanical pumps in many applications.
  • a mechanical pump may experience relatively rapid wear when pumping a slurry due to the relatively high concentration of solids contained in the slurry.
  • the ejector 1 of FIG. 1 since the ejector 1 of FIG. 1 has no moving parts it may be used to pump the slurry for a much longer period of time before maintenance is required.
  • a conventional mechanical pump may be used to pump through the ejector 1 a motive fluid having a relatively low concentration of solids therein. Since the pump need not be exposed to the suction fluid, which may have a relatively high concentration of solids therein, a lifespan of the mechanical pump is not unduly reduced by the presence of solids in the suction fluid.
  • US2005/0064255 discloses an electric power generation system in which a fuel cell system is provided with flow cell recirculation.
  • the apparatus has an ejector assembly having two ejectors arranged in parallel with a common suction inlet.
  • the apparatus has two motive flow inlets (one for each ejector) and one discharge outlet.
  • One of the ejectors is optmised for low fluid flow conditions and the other for high fluid flow conditions.
  • CN1308991 discloses a steam injector having three ejectors arranged in parallel.
  • the ejectors have a common motive fluid inlet aperture, a common suction fluid inlet aperture and a common discharge fluid outlet aperture.
  • JP7167100 discloses a liquid ejector having a pair of diffusers arranged in a parallel configuration. As in the case of the apparatus disclosed in CN1308991 the ejectors have a common motive fluid inlet aperture, a common suction fluid inlet aperture and a common discharge fluid outlet aperture.
  • an ejector for pumping oil or gas from a well head.
  • use of an ejector can increase the amount of oil or gas that may be drawn from a well by a substantial amount at a relatively low cost. It is therefore desirable to employ ejector technology in oil and gas recovery systems in order to make best use of dwindling natural resources.
  • fluid pump apparatus comprising a plurality of ejectors, the apparatus having at least one motive fluid inlet arranged to supply motive fluid to the apparatus, at least one suction fluid inlet arranged to supply suction fluid to the apparatus and a common discharge outlet from which motive fluid and suction fluid that have passed through the ejectors is expelled from the apparatus, each ejector having a respective injector portion and a respective diffuser portion, the injector portion being arranged to inject motive fluid from at least one said at least one motive fluid inlet into the diffuser portion thereby to draw suction fluid into the diffuser portion from at least one said at least one suction fluid inlet, the diffuser portion having a Venturi portion, each ejector having a respective flow stabilisation portion downstream of the Venturi portion thereof, the flow stabilisation portion being arranged to stabilise a flow of motive fluid and suction fluid therethrough before respective flows of fluid through each ejector meet downstream of the ejectors, wherein the flow stabilisation portion comprises
  • the flow stabilisation conduit may be integrally formed with the Venturi portion, for example by casting, by moulding or by machining from a single piece of material.
  • the flow velocity of fluid exiting the Venturi device is lower than that of fluid passing through the constricted portion of the Venturi.
  • the fluid attempts to fill the diverging portion and eddy currents are typically formed as it does so.
  • the present inventors have discovered that the distance over which the flow stabilises downstream of the Venturi can be advantageously reduced by providing a flow stabilisation portion immediately downstream of the Venturi portion of each ejector.
  • the flow is able to assume laminar flow conditions a shorter distance downstream of the Venturi due to the presence of the flow stabilisation portion.
  • Embodiments of the invention have the advantage that because flow of fluid through each ejector is stabilised by the flow stabilisation portion of each ejector before the flows are combined, flow stabilisation may be achieved over a shorter installed length of the apparatus than if each ejector is not provided with its own individual flow stabilisation portion.
  • flow stabilisation will occur over a longer length downstream of the Venturi portions than in the case that each ejector has its own flow stabilisation portion immediately downstream of its Venturi portion.
  • embodiments of the invention have the advantage that they may be provided having a reduced installed length compared with known ejectors of a comparable pumping efficiency.
  • embodiments of the invention may be provided having a reduced installed length without compromising a flow rate of entrained fluid for a given motive flow rate under a given set of boundary pressures and/or boundary conditions.
  • the flow stabilisation portion has a length equal to at least double the diameter thereof.
  • the flow stabilisation portion may have a length of substantially at least one selected from amongst three times, four times, five times, six times, seven times, eight times, nine times, ten times, fifteen times, twenty times, fifty times and one hundred times the diameter thereof.
  • the flow stabilisation portion has at length of at least five times the diameter thereof.
  • the flow stabilisation portion has a length in the range from around 6 to around 10 times the diameter thereof.
  • the apparatus may further comprise a manifold portion between the ejectors and the discharge outlet, the manifold portion comprising a conduit arranged to receive fluid flowing out from the diffuser portions of the ejectors of the apparatus.
  • the apparatus may be further provided with a bend conduit being a conduit having a bend portion, the bend conduit being provided downstream of the plurality of ejectors.
  • the bend conduit may be arranged to turn a direction of the flow of fluid through one selected from at least substantially 45°, at least 90° and substantially 180°.
  • the bend conduit may be provided downstream of the manifold portion.
  • the apparatus may be provided in combination with a bend conduit being a conduit having a bend portion wherein the conduit bends through an angle ⁇ where ⁇ is nonzero, the bend portion being provided downstream of the common discharge outlet wherein fluid flowing through the plurality of ejectors is directed to flow through the bend conduit.
  • the bend conduit may be arranged wherein ⁇ takes a value given by one selected from amongst 30° ⁇ 60°, 60° ⁇ 90°, 90° ⁇ 120°, 120° ⁇ 150° and 150° ⁇ 180°.
  • ⁇ may take a value of one selected from amongst substantially 45°, substantially 90° and substantially 180°.
  • the injector portion of at least one of the ejectors may comprise a plurality of injectors.
  • the apparatus may have a separate motive fluid inlet for each ejector whereby a flow of motive fluid to a nozzle portion of the injector portion of one ejector may be prevented from mixing with a flow of motive fluid to the nozzle portion of another ejector.
  • the apparatus may have a common motive fluid inlet arranged to supply motive fluid to each of the plurality of ejectors.
  • the apparatus may be operable to prevent a flow of fluid through the injector portion of one of the plurality of ejectors.
  • This feature has the advantage that a pumping rate of the apparatus may be controlled without adjusting the motive fluid flow rate external to the apparatus.
  • the apparatus may be operable to prevent a flow of fluid through the injector portion of each of a plurality of the ejectors.
  • This feature has the advantage of allowing a greater range of control of pumping rate.
  • the apparatus may be operable to prevent a flow of fluid through the diffuser portion of one of the plurality of ejectors.
  • One of the plurality of ejectors may have a portion having a size different from the corresponding portion of another of the ejectors.
  • This feature has the advantage that in some embodiments the pumping rate of the apparatus may be more precisely controlled.
  • Said one of the plurality of ejectors may have a portion having a diameter different from the corresponding portion of the other of the ejectors.
  • Said portion may be one selected from amongst the injector portion, the diffuser portion, the Venturi portion and the flow stabilisation portion.
  • the flow stabilisation conduit has substantially the same diameter as a downstream end of the Venturi portion
  • the flow stabilisation conduit has a length substantially equal to from one to two times or from two to three times the diameter thereof.
  • apparatus in a further aspect of the invention there is provided apparatus according to the first aspect installed in a subsea system.
  • apparatus located in an underwater system and arranged to pump a fluid in the underwater system.
  • a method of pumping a fluid comprising the steps of: providing a flow of motive fluid to each of a plurality of ejectors thereby to draw suction fluid through each ejector and expel discharge fluid drawn through the ejectors through a common discharge outlet, each ejector having a respective injector portion and a respective diffuser portion, the method comprising injecting motive fluid into the diffuser portion thereby to draw the suction fluid into the diffuser portion, the diffuser portion having a Venturi portion, each ejector having a respective flow stabilisation portion downstream of the Venturi portion thereof, the method further comprising stabilising a flow of fluid from the diffuser portion as it passes through the flow stabilisation portion before respective fluid flows through each ejector meet downstream of the ejectors, the step of passing the fluid through the flow stabilisation portion comprising passing the fluid through a conduit having substantially constant diameter and a length substantially equal to at least the diameter thereof.
  • fluid pump apparatus comprising a plurality of ejectors, the apparatus having at least one motive fluid inlet arranged to supply motive fluid to the apparatus, at least one suction fluid inlet arranged to supply suction fluid to the apparatus and a common discharge outlet from which motive fluid and suction fluid that have passed through the ejectors may be expelled from the apparatus, each ejector having a respective injector portion and a respective diffuser portion, the injector portion being arranged to inject motive fluid from at least one said at least one motive fluid inlet into the diffuser portion thereby to draw suction fluid into the diffuser portion from at least one said at least one suction fluid inlet, the diffuser portion having a Venturi portion, each ejector having a respective flow stabilisation portion downstream of the Venturi portion thereof, the flow stabilisation portion being arranged to stabilise a flow of motive fluid and suction fluid therethrough before the respective flows of fluid through each ejector meet downstream of the ejectors, wherein the flow stabilisation portion comprises a flow
  • Venturi portion includes reference to any suitable device for inducing the Venturi effect in a flow of fluid through the diffuser portion of the ejectors. That is, a reduction in fluid pressure that results when a fluid flows through a constricted section of a pipe or tube.
  • FIG. 2 shows ejector apparatus 100 according to an embodiment of the present invention.
  • the apparatus 100 has a body portion 100B having a single motive fluid inlet 110, a single suction fluid inlet 120 and a single outlet aperture 154. Fluid entering the apparatus 100 through either inlet 110, 120 is arranged to be discharged from the apparatus 100 through the outlet aperture 154.
  • the apparatus 100 has four ejectors three of which are shown in FIG. 2 labelled 101, 102 and 103 respectively.
  • Each ejector 101, 102, 103 has an injector 140 having a nozzle portion 140A, 140B, 140C .
  • Each of the nozzle portions 140A, 140B, 140C has a respective inlet aperture 141A, 141B, 141C respectively arranged in fluid communication with the motive fluid inlet 110.
  • Each nozzle portion 140A, 140B, 140C has a nozzle outlet aperture 144 arranged to inject inlet fluid from the nozzle portions 140A, 140B, 140C into a corresponding diffuser portion 150 of each ejector 101, 102, 103 labelled 150A, 150B, 150C respectively.
  • Each diffuser portion 150 has a Venturi portion 155 and a stabiliser or flow stabilisation portion 157 provided downstream of the Venturi portion 155.
  • Each Venturi portion 155 has a converging section 155CON along which a diameter of the Venturi portion decreases, a throat section 155T of substantially constant diameter and a diverging section 155DIV along which the diameter of the Venturi portion increases again.
  • each diffuser portion 150A, 150B, 150C is provided immediately downstream of the diverging section 155DIV.
  • the stabiliser portion 157 is in the form of a conduit having a diameter substantially equal to that of the diverging section 155DIV of the Venturi portion 155 at the downstream end of that section 155DIV.
  • the stabiliser portions 157 of the ejectors 101, 102, 103 are each of a length of around six times their diameter. A single stabiliser portion 157A is shown in FIG. 2 for clarity, being part of ejector 101.
  • the stabiliser portions 157 are each of a length of from around six to around ten times their diameter. Other lengths are also useful.
  • the stabiliser portions 157 are in fluid communication with the outlet aperture 154 by means of a manifold portion 170.
  • the apparatus is arranged to pump suction fluid through the suction fluid inlet 120 and through the diffuser portions 150 of the ejectors 101, 102, 103 when a motive fluid is forced through the motive fluid inlet 110.
  • a decrease in pressure occurs at the entrance aperture to each of the diffuser portions 150 as motive fluid is injected from the injectors 140 into the diffuser portions 150 thereby drawing suction fluid through the suction fluid inlet 120.
  • each of the ejectors 101, 102, 103 causes stable flow conditions to be established in the fluid flowing through each of the ejectors 101, 102, 103 before the fluid is expelled from the apparatus 100.
  • This has the advantage that if a conduit having a bend therein is provided downstream of the apparatus 100 a pumping speed of the apparatus 100 is not reduced to the same extent as corresponding apparatus having ejectors 101, 102, 103 not having the stabiliser portions 157.
  • the feature that the presence of a bend portion does not reduce pumping speed to the same extent has the advantage that apparatus may be provided that is more compact.
  • the apparatus has a reduced length compared with prior art apparatus.
  • FIG. 3 shows the apparatus 100 of the embodiment of FIG. 2 in cross-section through a pair of ejectors 102, 103 of the apparatus 100.
  • the flow path of motive fluid FM from nozzle portions 140B, 140C is shown, together with the flow path of suction fluid FS into the apparatus 100 through suction fluid inlet 120.
  • motive fluid FM injected through nozzle portions 140B, 140C of each ejector 102, 103 is arranged to pass into respective diffuser portions 150B, 150C.
  • suction fluid FS is drawn through the suction fluid inlet 120 and becomes entrained in the flow of motive fluid FM passing from the injectors 140 into the diffuser portions 150.
  • suction fluid entrained in motive fluid, FMS flows through the diffuser portions 150.
  • a valve is provided in each of the four injectors 140 operable to prevent fluid flow from the respective injector 140A, B, C into the corresponding diffuser portion 150. This feature allows the pumping rate of the apparatus 100 to be varied according to demand and/or the type of suction fluid FS to be pumped.
  • the apparatus is arranged to allow fluid to flow in a reverse direction through one of the diffuser portions 150A, B, C of one or more of the four ejectors 101, 102, 103 back to the inlets of the diffuser portions if fluid is not being injected into that diffuser portion 150 from the respective injector 140A, B, C.
  • This has the advantage that flow of fluid through the apparatus 100 may be manipulated in order to obtain optimum flow conditions for a given application or type of suction fluid FS.
  • the apparatus may be arranged to allow this reverse direction of fluid flow by terminating a supply of fluid to one or more of the injectors 140A, B, C such that motive fluid is not injected into the corresponding diffuser 150.
  • this may be accomplished by providing a valve within the respective injector 140A, B, C or by providing a valve upstream of the injector 140A, B, C to prevent a flow of fluid into the injector 140A, B, C.
  • suction fluid inlet pressure at the suction inlet 120 and discharge fluid pressure at the outlet aperture 154 may be reduced by preventing flow of fluid through one or more of the injectors 140A, B, C and allowing recirculation of some discharge fluid back through one or more of the diffuser portions 150B, C before it passes through the fluid outlet aperture 154.
  • a valve such as a throttle valve
  • suction fluid FS which may be a slurry in some applications
  • suction fluid entrained in motive fluid FMS being a diluted slurry in some applications.
  • Provision of a valve in a flow of slurry is undesirable due to issues in respect of valve movement and valve closure in addition to wear of the valve.
  • motive fluid typically liquid not being a slurry, or a gas
  • control of suction fluid flow rate may be effected without changing the pressure of fluid at either the motive fluid inlet, the suction fluid inlet or the discharge fluid outlet of the apparatus.
  • control of fluid flow rate may be made without a requirement to position a valve in a flowpath of suction fluid or suction fluid entrained in motive fluid.
  • FIG. 4 shows the apparatus 100 of FIG. 2 installed in an underwater oil recovery system in which the apparatus is arranged to pump slurry from an outlet of a separator 105.
  • the separator 105 may be arranged to separate solids and liquids pumped from a subsea oil well, an outlet of the separator being coupled to a suction fluid inlet 120 of the apparatus 100.
  • a motive inlet 110 of the apparatus 100 is coupled to a motive fluid pump 171 arranged to pump motive fluid therethrough.
  • the apparatus 100 is thereby arranged to pump fluid from the separator 105 entrained in motive fluid out from the apparatus 100 through the fluid outlet 154.
  • a fluid conduit 185 is coupled to the fluid outlet 154 of the apparatus 100.
  • a bend 185B is provided in the conduit 185.
  • an installed length of the apparatus 100 from the motive inlet 110 to the bend 185B for a given pumping efficiency may be made less than that which would be possible in a known ejector not having a flow stabilisation portion downstream of the Venturi portion 155B, C of each ejector 101A, B, C.
  • This has the advantage of enabling a reduction in a size and cost of the apparatus 100 and in turn the underwater oil recovery system.
  • apparatus may be employed to pump a fluid such as a liquid, gas or slurry from a source to a separator.
  • a fluid such as a liquid, gas or slurry from a source to a separator.
  • Other arrangements are also useful.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Jet Pumps And Other Pumps (AREA)
EP11782465.6A 2010-11-05 2011-11-07 Ejector and method Active EP2635816B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB1018721.9A GB201018721D0 (en) 2010-11-05 2010-11-05 Improved ejector and method
PCT/GB2011/052163 WO2012059773A2 (en) 2010-11-05 2011-11-07 Improved ejector and method

Publications (2)

Publication Number Publication Date
EP2635816A2 EP2635816A2 (en) 2013-09-11
EP2635816B1 true EP2635816B1 (en) 2020-02-12

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ID=43414425

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11782465.6A Active EP2635816B1 (en) 2010-11-05 2011-11-07 Ejector and method

Country Status (6)

Country Link
US (1) US20130216352A1 (es)
EP (1) EP2635816B1 (es)
BR (1) BR112013010970A2 (es)
ES (1) ES2790376T3 (es)
GB (2) GB201018721D0 (es)
WO (1) WO2012059773A2 (es)

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GB2527096A (en) * 2014-06-11 2015-12-16 Transvac Systems Ltd Ejector device and method
EP3085968A1 (en) * 2015-04-22 2016-10-26 Ellehammer A/S A set of parts for being assembled to form an ejector pump and a method of using an ejector pump
US9745871B2 (en) 2015-08-24 2017-08-29 Saudi Arabian Oil Company Kalina cycle based conversion of gas processing plant waste heat into power
US10113448B2 (en) 2015-08-24 2018-10-30 Saudi Arabian Oil Company Organic Rankine cycle based conversion of gas processing plant waste heat into power
GB2558627B (en) 2017-01-11 2020-02-26 Transvac Systems Ltd Ejector device
JP6767711B2 (ja) 2017-06-09 2020-10-14 Smc株式会社 サイレンサおよびサイレンサを用いたエジェクタ
GB201916064D0 (en) 2019-11-05 2019-12-18 Transvac Systems Ltd Ejector device
GB202015672D0 (en) 2020-10-02 2020-11-18 Transvac Systems Ltd Apparatus and method

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Also Published As

Publication number Publication date
EP2635816A2 (en) 2013-09-11
GB201309822D0 (en) 2013-07-17
GB2499166B (en) 2017-09-06
GB2499166A (en) 2013-08-07
GB201018721D0 (en) 2010-12-22
ES2790376T3 (es) 2020-10-27
WO2012059773A2 (en) 2012-05-10
WO2012059773A3 (en) 2013-08-08
BR112013010970A2 (pt) 2016-08-30
US20130216352A1 (en) 2013-08-22

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