EP2994639B1 - Electromechanical pump - Google Patents

Electromechanical pump Download PDF

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Publication number
EP2994639B1
EP2994639B1 EP14719308.0A EP14719308A EP2994639B1 EP 2994639 B1 EP2994639 B1 EP 2994639B1 EP 14719308 A EP14719308 A EP 14719308A EP 2994639 B1 EP2994639 B1 EP 2994639B1
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EP
European Patent Office
Prior art keywords
piston
pressure increasing
increasing tube
intermediate chamber
inner part
Prior art date
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Active
Application number
EP14719308.0A
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German (de)
English (en)
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EP2994639A1 (fr
EP2994639B8 (fr
Inventor
Pierre Mayoraz
Gaetan Dayer
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GOTEC SA
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GOTEC SA
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Publication of EP2994639B1 publication Critical patent/EP2994639B1/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
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B17/00—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
    • F04B17/03—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors
    • F04B17/04—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors using solenoids
    • F04B17/046—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors using solenoids the fluid flowing through the moving part of the motor
    • 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
    • F04B53/10—Valves; Arrangement of valves
    • F04B53/12—Valves; Arrangement of valves arranged in or on pistons
    • F04B53/125—Reciprocating valves
    • 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
    • F04B53/16—Casings; Cylinders; Cylinder liners or heads; Fluid connections

Definitions

  • the present invention relates to an electromechanical pump, and in particularly, but not exclusively, to an electromechanical pump which comprises a pressure increasing tube which is arranged within a main spring used to move a piston in the pump. There is further provided a corresponding method of manufacturing an electromagnetic pump.
  • FIG. 7a shows a longitudinal-section view of a known electromagnetic pump 70 currently used in the art.
  • the electromagnetic pump 70 comprises a piston 71 which is made from ferromagnetic material.
  • a pressure increasing tube 75 is further provided; the pressure increasing tube 75 is integral to the piston 71 so that the piston 71 and pressure increasing tube 75 are defined by a single component.
  • the piston 71 defines a channel 81 through which fluid can flow from an inlet 82 to the pressure increasing tube 75 and into an intermediate chamber 77. Fluid can flow from the intermediate chamber to an outlet 79.
  • the piston 71 is biased towards a first position by means of a main spring 78.
  • the electromagnetic pump 70 further comprises a coil 73; when current is passed through the coil 73, a magnetic field is generated which forces the piston 71 towards a second position.
  • the electromagnetic pump 70 further comprises a first valve 76 which controls the flow of fluid from the pressure increasing tube 75 into an intermediate chamber 77.
  • a second valve 74 is provided, which controls the flow of fluid from the intermediate chamber 77 to an outlet 79.
  • Moving the piston towards its second position creates a vacuum in the intermediate chamber 77 which causes the first valve 76 to open, , thus allowing fluid to flow from the inlet 82, through the channel 81 in the piston 71, into the pressure increasing tube 75, and into the intermediate chamber 77.
  • Moving the piston 71 to its first position closes the first valve 76, increases the pressure within the intermediate chamber 77; the increase in pressure within the intermediate chamber 77 causes the first valve 76 is forced to close and the second valve 74 to open causes.
  • the increase in pressure with an intermediate chamber 77 causes the fluid within the intermediate chamber 77 to force the second valve to open, thus enabling fluid to flow from the intermediate chamber 77 to the outlet 79.
  • Figure 7b shows the electromagnetic pump 70 when piston 71 in its second position
  • Figure 7c shows the electromagnetic pump 70 when the piston in its first position.
  • each of the main spring 78, pressure increasing tube 75 and piston 71 are distributed along the length of the electromagnetic pump 70, each at a different, exclusive, position along the length of the electromagnetic pump 70. Accordingly the electromagnetic pump 70 is long and not compact enough for certain applications.
  • main spring 78, pressure increasing tube 75 and piston 71 are coaxial, to allow the piston 71 to smoothly move between its first and second position.
  • main spring 78, pressure increasing tube 75 and piston 71 are each distributed along the length of the electromagnetic pump 70, at different, exclusive, positions, these components are more susceptible to becoming displaced from being coaxial with one another if a force is applied to an end of the electromagnetic pump 1.
  • a force may be applied to and end of the electromagnetic pump 1 when screwing the end of the electromagnetic pump 1 to a structure to secure the electromagnetic pump 1 to the structure; this force may cause displacement of the pressure increasing tube 75 so that it is no longer coaxial with the main spring 78 and piston 71.
  • the pressure increasing tube 75 is integral to the piston 71 so that the piston 71 and pressure increasing tube 75 are defined by a single component, it is difficult to make the piston 71 and pressure increasing tube 75 from different materials.
  • an electromagnetic pump comprising, an inlet; an outlet; an intermediate chamber located between said inlet and said outlet; a first valve for controlling the flow of fluid into the intermediate chamber, and a second valve for controlling the flow of fluid out of the intermediate chamber; a piston, at least a part of which comprises ferromagnetic material, located between the inlet and outlet, and including a channel through which fluid can flow, wherein the piston is moveable between a first and second position to control the opening and closing of the first and second valves; a main spring which is arranged to exert a force against said piston to bias the piston towards its first position; a coil for generating an electromagnetic field for moving said piston towards its second position, against the biasing force exerted by said main spring; a pressure increasing tube with an inner diameter which is smaller than an inner diameter of the inlet, so fluid flowing from the inlet into the pressure increasing tube is pressurized; wherein said at least a portion of the length of the pressure increasing tube is located within said main spring, and wherein the piston comprises an
  • locating at least a portion of the length of the pressure increasing tube within said main spring ensures that at least part of the pressure increasing tube and at least a part of the main spring share same position along the length of the electromagnetic pump, thus reducing the length electromagnetic pump. Furthermore, the pressure increasing tube will now be located in a more central position along the length of the electromagnetic pump thus ensuring that the pressure increasing tube is less susceptible to becoming displaced, from being coaxial with the piston, by a force applied to an end of the electromagnetic pump.
  • the first valve is opened and the second valve is closed, and when the piston is in its second position the first valve is closed and the second valve is opened.
  • the intermediate chamber can fill with fluid, and when the piston is in its second position the fluid within the intermediate chamber can pass from the intermediate chamber to the outlet.
  • pressure within said intermediate chamber is reduced when the first valve is open and the piston is moved towards its first position, so that fluid can flow from the inlet into the intermediate chamber.
  • pressure within said intermediate chamber is increased when the first valve is closed and the piston is moved towards its second position, to compresses a fluid within said intermediate chamber, so that said compressed fluid can flow from the intermediate chamber towards the outlet.
  • the main spring is preferably a helical spring.
  • the intermediate chamber may be separated from said inlet by a first valve and from said outlet by a second valve.
  • Fluid preferably flows from the inlet towards the outlet.
  • the pressure increasing tube is located upstream of said piston.
  • the pressure increasing tube is located between the inlet and the intermediate chamber.
  • the pressure increasing tube is arranged to fluidly connect the inlet with the intermediate chamber.
  • the pressure increasing tube is integral to said inlet.
  • this will reduce the number of parts in the electromagnetic pump.
  • this will enable easier manufacture of the electromagnetic pump; for example the manufacture of the electromagnetic pump would be made easier since the inlet and pressure increase tube could be made using a single moulding step (e.g. a single injection moulding step).
  • the pressure increasing tube and piston are mechanically independent.
  • the piston could be made from ferromagnetic material
  • the pressure increasing tube could be made from non-ferromagnetic material, such as plastic or polymer, or any other suitable non-ferromagnetic metal. This will also aid in reducing the cost of the electromagnetic pump.
  • the inner diameter of the pressure increasing tube is of a length necessary to pressurize fluid which passes through the pressure increasing tube to a predefined pressure.
  • the piston and the pressure increasing tube are coaxial.
  • the inner part of the piston, the outer part of the piston and the pressure increasing tube are coaxial.
  • the inner part and outer part are mechanically independent.
  • this will make is easier to make the inner and outer parts of the piston from different materials.
  • the outer part of the piston could be made from ferromagnetic material
  • the inner part of the piston could be made from plastic, or any other non-ferromagnetic metal. This will also aid in reducing the cost of the electromagnetic pump.
  • the inner part of the piston may be secured within the outer part of the piston.
  • the inner part of the piston is held by friction within the outer part of the piston.
  • an outer diameter of the inner part of the piston is substantially equal to an inner diameter of the outer part, so that the inner part of the piston can be held by friction within the outer part of the piston.
  • the pressure increasing tube has an inner diameter which is smaller than an inner diameter of the piston.
  • the pressure increasing tube has an inner diameter which is smaller than the outer diameter of the piston.
  • the pressure increasing tube has an inner diameter which is smaller than an inner diameter of the inner part of the piston.
  • the pressure increasing tube has an inner diameter which is smaller than an outer diameter of the inner part of the piston.
  • the pressure increasing tube has an inner diameter which is smaller than an inner diameter of the outer part of the piston.
  • the pressure increasing tube has an inner diameter which is smaller than an outer diameter of the outer part of the piston.
  • the inner part of the piston abuts the outer part of the piston.
  • the main spring is arranged to urge the inner part against the outer part. The main spring will thus ensure that the inner part of the piston is held in abutment with the outer part of the piston.
  • the inner part comprises an annular projection and the main spring is arranged to apply a biasing force to the annular projection to urge the inner part of the piston against the outer part of the piston.
  • the main spring is arranged to apply a biasing force to the annular projection so that the annular projection urged to abut an end of the outer part of the piston.
  • the piston defines the intermediate chamber. Accordingly, as the piston is moved between its first and second positions, the intermediate chamber will also be moved between a first and second position.
  • the intermediate chamber is preferably defined by the inner part of the piston.
  • the inner part of the piston preferably comprises a tubular member.
  • the outer part of the piston preferably comprises a tubular member.
  • the inner diameter of the pressure increasing tube is smaller than an inner diameter of the intermediate chamber.
  • the inner diameter of the pressure increasing tube may be smaller than an inner diameter of the channel defined in the outer part of the piston.
  • the inner diameter of the pressure increasing tube may be smaller than an inner diameter of the outlet.
  • At least a portion of the length of said pressure increasing tube may extend into intermediate chamber.
  • the pressure increasing tube is telescopically arranged within the inner part of the piston.
  • the inner part of the piston may further comprise an annular extension provided on an inner surface of the inner part of the piston.
  • the first valve may comprise a first plug and a first spring.
  • a first end of the first spring may be attached to the piston.
  • the first end of the spring is attached to inner part of the piston.
  • the first end of the spring is attached to said annular extension provided on the inner part of the piston.
  • the first plug may be fixed to a second, opposite, end of the first spring.
  • the first end of the first spring is the end of the first spring which is closest the outlet, and the second end of the first spring is the end of the first spring which is closest the inlet.
  • the first spring is preferably arranged to bias the first plug towards plugging the pressure increasing tube.
  • the piston When the piston is moved towards its first position, the piston is moved towards the outlet. Therefore moving the piston towards its first position reduces the biasing force applied by the first spring to the first plug.
  • the biasing force applied by the first spring to the first plug is decreased as the first spring is less compressed when the piston is moved towards its first position.
  • the biasing force applied by the first spring to the first plug is less than the force applied to the first plug by fluid inside the pressure increasing tube.
  • a vacuum is created in the intermediate chamber.
  • the piston When the piston is moved towards it second position the piston is moved towards the inlet. Therefore moving the piston towards its first position increases the biasing force applied by the first spring to the first plug.
  • the biasing force applied by the first spring to the first plug is increased as the first spring is compressed more when the piston is moved towards its second position.
  • the biasing force applied by the first spring to the first plug is greater than the force applied to the first plug by fluid inside the pressure increasing tube.
  • the second valve may comprise a second plug and a second spring.
  • a first end of the second spring may be attached to the outlet.
  • the first end of the second spring may be attached to the outer part of the piston.
  • the outer part of the piston may further comprise a collar, and the first end of the second spring may be attached to the collar provided on the outer part of the piston.
  • the second plug may be fixed to a second, opposite, end of the second spring.
  • the second spring is preferably arranged to bias the second plug towards plugging the inner part of the piston.
  • the second spring is arranged to bias the second plug towards plugging the inner part of the piston so as to prevent the fluid from flowing out of the intermediate chamber towards the outlet.
  • the first end of the second spring is the end of the second spring which is closest the outlet, and the second end of the second spring is the end of the second spring which is closest the inlet.
  • the piston When the piston is moved towards its first position, the piston is moved towards the outlet. Therefore moving the piston towards its first position increases the biasing force applied by the second spring to the second plug.
  • the biasing force applied by the second spring to the second plug is increased as the second spring is compressed more when the piston is moved towards it first position.
  • the biasing force applied by the second spring to the second plug is greater than the force applied to the second plug by fluid inside the intermediate chamber.
  • the second plug will plug the inner part of the piston to prevent the flow of fluid from the intermediate chamber into the channel defined in the outer part of the piston and from the channel defined in the outer part of the piston into the intermediate chamber.
  • the second plug will thus prevent the flow of fluid from the intermediate chamber to the outlet and/or from the outlet to the intermediate chamber.
  • the piston When the piston is moved towards it second position the piston is moved towards the inlet. Therefore moving the piston towards its first position decreases the biasing force applied by the second spring to the second plug.
  • the biasing force applied by the second spring to the second plug is decreased as the second spring is less compressed when the piston is moved towards it second position.
  • the biasing force applied by the second spring to the second plug is less than the force applied to the second plug by fluid inside the intermediate chamber. Also when the piston is moved towards its second position the pressure inside the intermediate chamber is increased, thus any fluid within the intermediate chamber will become pressurized.
  • the second plug when the piston is in its second position the second plug will be unplugged from the inner part of the piston by pressurized fluid in the intermediate chamber, so that the pressurized fluid within the intermediate chamber can flow from the intermediate chamber into the channel defined in the outer part of the piston. Ultimately, the second plug will thus be unplugged from the inner part of the piston to allow fluid to flow from the intermediate chamber into the outlet.
  • first and second springs may be contracted because of the pressure changes which occur within the intermediate chamber of the electromagnetic pump.
  • the first valve is opened when the volume of the intermediate chamber is decreased (i.e. when the vacuum is created in the intermediate chamber), the vacuum will also aid in maintaining the second value closed; this occurs when the piston is moved to its first position.
  • the second valve is opened when the volume in the intermediate chamber increased (i.e. when the pressure inside the intermediate chamber is increased to pressurize the liquid in the intermediate chamber), the increase in pressure inside the intermediate chamber will also aid in maintaining the first valve closed; this occurs when the piston is moved to its second position.
  • the piston when the piston is in its first position it is closer to the outlet than the inlet. Preferably when the piston is in its second position it is closer to the inlet than the outlet.
  • the piston when the piston is in its first position the telescopically arrangement of the inner part of the piston and the pressure increasing tube is at a maximum extension.
  • the piston when the piston is in its second position, the telescopically arrangement of the inner part of the piston and the pressure increasing tube is collapsed.
  • the first plug when the piston is in its first position, the first plug is removed from the pressuring increasing tube, to unplug the pressure increasing tube, to allow fluid to flow from the pressure increasing tube into the intermediate chamber.
  • the first plug plugs the pressure increasing tube, to prevent fluid from flowing from the intermediate chamber into the pressure increasing tube and/or from the intermediate chamber into the pressure increasing tube.
  • the second plug plugs the inner part of the piston, to prevent fluid from flowing out of the channel defined in the outer part of the piston into the intermediate chamber and/or from the intermediate chamber into the channel defined in the outer part of the piston, and into the outlet.
  • the second plug is removed from the inner part of the piston, to unplug the inner part of the piston, to allow fluid to flow from the intermediate chamber into the channel defined in the outer part of the piston, and into the outlet.
  • the first and/or second plugs may have a spherical shape.
  • the first and/or second plugs may have a stepped-cylindrical shape. It will be understood that the first and/or second plugs may have any suitable shape or configuration.
  • At least one clearance channel is provided between the inner part of the piston and the outer part of the piston.
  • a plurality of clearance channels is provided between the inner part of the piston and the outer part of the piston.
  • One of the outer part or inner part of the piston may comprise a ferromagnetic material and the other part may comprise non-ferromagnetic material.
  • One of the outer part or inner part of the piston may be composed of a ferromagnetic material and the other part may be composed of a non-ferromagnetic material.
  • the outer part of the piston may be composed of a ferromagnetic material and the inner part of the piston may be composed of a non-ferromagnetic material.
  • the inner part of the piston may be made from plastic or polymer.
  • a method of manufacturing an electromagnetic pump comprising the steps of, providing an inlet; providing an outlet; providing an intermediate chamber between said inlet and said outlet; providing a first valve for controlling the flow of fluid into the intermediate chamber, and providing a second valve for controlling the flow of fluid out of the intermediate chamber; providing a piston between the inlet and outlet, wherein the piston comprises a channel through which fluid can flow and at least a part of the piston comprises ferromagnetic material, and wherein the piston is moveable between a first and second position to control the opening and closing of the first and second valves; providing a main spring, and arranging the main spring to exert a force against said piston to bias the piston towards its first position; providing a coil for generating an electromagnetic field for moving said piston towards its second position, against the biasing force exerted by said main spring; providing a pressure increasing tube with an inner diameter which is smaller than an inner diameter of the inlet, so fluid flowing from the inlet into the pressure increasing tube is pressurized; wherein
  • the step of providing a piston comprises providing a piston which comprises an inner part and an outer part, wherein one of the inner or outer parts is composed of a ferromagnetic material and the other part is composed of non-ferromagnetic material.
  • the inner part and outer part are mechanically independent.
  • the step of providing a piston comprises providing a piston which comprises an inner part and an outer part, and the method comprises the step of arranging the inner part within the outer part, so that the inner part is held by friction within the outer part of the piston.
  • the step of providing a piston comprises providing a piston which comprises an inner part and an outer part
  • the method comprises the step of arranging the main spring to urge the inner part against the outer part, so that the main spring will hold the inner part in abutment with the outer part of the piston.
  • FIG. 1a shows a cross-sectional view of an electromagnetic pump 1 according to an embodiment of the present invention.
  • the electromagnetic pump 1 comprises an inlet 2, an outlet 3 and a piston 4located between the inlet 2 and outlet 3.
  • the electromagnetic pump 1 further comprises a main spring 5.
  • One end 6 of the main spring 5 abuts a surface 7 of the inlet 2 and the opposite end 8 of the main spring 5 abuts a surface 9 of the piston 4, so as to exert a force against said piston 4 to bias the piston toward a first position.
  • a coil 10 is further provided for generating an electromagnetic field which can move said piston 4, against the biasing force exerted by said main spring 5, towards a second position.
  • the main spring 5 is a helical spring.
  • the piston 4 comprises an inner part 16 and an outer part 17. At least part of the inner part 16 is arranged within the outer part 17, and both the inner and outer parts 16,17 of the piston 4 are fixed relatively to each other. In this particular example the majority of the inner part 16 is arranged within the outer part 17.
  • the inner part 16 of the piston 4 is held by friction within the outer part 17, so that the inner and outer parts 16,17 are fixed relative to each other.
  • the maximum (effective) outer diameter "D o "' of the inner part 16 of the piston 4 is preferably substantially equal to the inner diameter "d i " of the outer part 17 of the piston 4, as is illustrated in Figures 1b and c. It can also be seen in Figures 1a, b and c that the inner part 4 of the piston comprises a tubular member and that the outer part of the piston also comprises a tubular member.
  • At least one clearance-channel 18 is provided between the inner part 16 and the outer part 17 of the piston 4.
  • Figure 1b and c show three clearance-channels 18.
  • At least a part of the piston 4 comprises ferromagnetic material.
  • the outer part 17 comprises ferromagnetic material and the inner part 16 of the piston 4 comprises plastic (or any other suitable non- ferromagnetic material).
  • the inner part 16 of outer part 17 may comprise ferromagnetic material while the other part 16,17 comprises another material; or both the inner part 16 and outer part 17 could both comprise ferromagnetic material.
  • the inner part 16 of the piston 4 defines an intermediate chamber 11. Since the piston 4 is moveable between a first and second position, the intermediate chamber 11 which is defined by the inner part 16 of the piston 4 is, in effect, moveable between the first and second position. The piston 4 and therefore the intermediate chamber 11, is located between said inlet 2 and said outlet 3.
  • the outer part 17 of the piston 4 defines a channel 19 through which fluid can flow. Specifically, the outer part 17 of the piston 4 defines a channel 19 through which fluid, which flows out of the intermediate chamber 11, can flow to the outlet 3.
  • a pressure increasing tube 15 is provided which fluidly connects the inlet 2 with the intermediate chamber 11.
  • a portion of the length "L” of the pressure increasing tube 15 is located within the main spring 5; in this example the majority of the length "L” of the pressure increasing tube 15 is located within the main spring 15.
  • the pressure increasing tube 15 is also mechanically independent of the piston 4.
  • the pressure increasing tube 15 has an inner diameter 'd' which is smaller than an inner diameter 'D' of the inlet 2, so that the pressure in the fluid flowing from the inlet 2 into the pressure increasing tube 15 is increased.
  • the fluid preferably flows from the inlet 2 towards the outlet 3, therefore the pressure increasing tube 15 can be considered to be located upstream of said piston 4.
  • a first valve 12 is provided to control the flow of fluid from the pressure increasing tube 15 into the intermediate chamber 11.
  • a second valve 13 is provided to control the flow of fluid from the intermediate chamber 11 to the channel 19 defined by the outer part 17 of the piston.
  • the first and second valves 12,13 control the flow of fluid from the inlet 2 into the intermediate chamber 11 and from the intermediate chamber 11 to the outlet 3, respectively.
  • the first valve 12 comprises a first plug 21 and a first spring 22.
  • a first end 23 of the first spring 22 is attached to an annular extension 25 provided on the inner surface 26 of the inner part 16 of the piston 4; and the first plug 21 is fixed to a second, opposite, end 27 of the first spring 22.
  • the first spring 22 extends from the annular extension 25 to proximate the pressure increasing tube 15, and biases the first plug 21 plugs towards plugging the pressure increasing tube 15.
  • the second valve 13 comprises a second plug 31 and a second spring 32. A first end 33 of the second spring abuts the outlet 3 and the second plug 31 is fixed to a second, opposite, end 37 of the second spring 32.
  • the second spring extends from the outlet 3 to proximate the inner part 16 and biases the second plug 31 towards plugging the inner part 16 of the piston (thus plugging the intermediate chamber 11).
  • the second plug 32 comprises a spherical member 32 and the first plug 21 comprises a stepped-cylindrical member 21; however it will be understood that the first and second plugs 21, 31 may have any suitable shape or configuration.
  • a portion of the length of said pressure increasing tube 15 extends into the inner part 16 of the piston 16.
  • the pressure increasing tube 15 is telescopically arranged within the inner part 16 of the piston.
  • a first seal 43 is located between an outer surface 44 of the pressure increasing tube 15 and the inner surface 26 of the inner part 16 of the piston 4.
  • the first seal 43 is defined by an o-ring; however it will be understood that any suitable seal may be provided. The first seal 43 will prevent fluid from flowing out of the intermediate chamber 11 between the pressure increasing tube 15 and inner part 16 of the piston 4.
  • An o-ring45 is provided between the outer part 17 of the piston 4 and the outlet 3.
  • the o-ring 45 acts as a shock absorber.
  • the pressure increasing tube 15 is arranged so that at least a portion of its length "L" is located within said main spring 5. Locating at least a portion of the pressure increasing tube 15 within the main spring 5 reduces the total length of the electromagnetic pump 1. Additionally, the pressure increasing tube 15 is located in a more central position in the electromagnetic pump 1, thus reducing the chances of the pressure increasing tube 15 becoming displaced from being coaxial with the piston 4 if a force (such as a radial force) is applied to an end of the electromagnetic pump 1.
  • the pressure increasing tube 15 may be configured to be integral to said inlet 2, thus reducing the number of parts in the electromagnetic pump 1. Furthermore, in this example since the pressure increasing tube 15 and piston 4 are mechanically independent, it is easier to make both components from different material; for example, if the piston 4 is made from ferromagnetic material, the pressure increasing tube 15 can be easily made from another material, such as non-ferromagnetic material like plastic, as it is mechanically independent to the piston 4.
  • Figures 2 and 3 illustrate the electromechanical pump 1 during use.
  • fluid flows from the inlet 2 into the pressure increasing tube 15.
  • the diameter "d" of the pressure increasing tube 15 is smaller than the diameter "D" of the inlet 2 pressure in fluid which flows from the inlet 2 into the pressure increasing tube 15 is increased.
  • the biasing force exerted on the piston 4 by the main spring 5 moves the piston 4 to its first position. Therefore Figure 2 shows the piston in its first position. Since the first spring 22 of the first valve 12 is attached at its first end 23 to the annular extension 25 provided on inner part 16 of the piston 4, moving the piston 4 towards its first position moves the first end of the spring 22 away from the pressure increasing tube 15 and thus reduces the biasing applied by the first spring 22 to the first plug 21.
  • Figure 3 shows the piston 4 in its second position.
  • the piston 4 When the piston 4 is moved towards its second position the piston 4, the volume of the intermediate chamber 11 is decreased; accordingly the fluid within the intermediate chamber 11 is increased and becomes pressurized.
  • the pressurized fluid pushes the first plug 21, of the first valve 12 towards the pressure increasing tube 15 so that first plug 21 plugs the pressure increasing tube 15.
  • the first plug 21 is moved to plug the pressure increasing tube 15 and the first spring 22 is compressed between the annular extension 25 on the inner part 16 of the piston and the first plug 21 so as to increase the biasing force applied by the first spring 22 to the first plug 21.
  • the first plug 21 will plug the pressure increasing tube 15 to prevent the flow of the pressurized fluid from the intermediate chamber 11 to the pressure increasing tube 15 and from the pressure increasing tube 15 into the intermediate chamber 11 .
  • the biasing force applied by the second spring 32 to the second plug 31 in the second valve 13 is reduced.
  • the pressurized fluid within the intermediate chamber 11 will push the second plug 31 away from the inner part 16 of the piston 4 thus urging the second plug 31 to unplug the inner part 16 of the piston 4.
  • the pressurized fluid in the intermediate chamber 11 will force the second plug 32 to become unplugged from the inner part 16 of the piston, and pressurized fluid will flow from the intermediate chamber 11 into the channel 19 defined in the outer part 17 of the piston, and subsequently into the outlet 3.
  • moving the piston 4 to its first position opens the first valve 12 and closes the second valve 13, while moving the piston 4 to its second position closes the first valve 12 and opens the second valve 13.
  • the piston can be continuously, alternatively, moved between its first and second positions, to provide a substantially, continuous flow of fluid from the inlet 2 to the outlet 3.
  • FIG 4a shows a cross-sectional view of an electromagnetic pump 50 according to a further embodiment of the present invention.
  • the electromagnetic pump 50 comprises many of the same features as the electromagnetic pump shown in Figures 1a-3 and like features are awarded the same reference numbers.
  • the electromagnetic pump 50 comprises a different type of piston 4. Furthermore, the first end 33 of the second spring 32 of the second valve 13, abuts a collar 53 provided on an inner surface 55 of the outer part 17 of the piston.
  • the electromagnetic pump 50 comprises a piston 4 which has an inner part 56 and an outer part 57.
  • Figure 4b provides a perspective view of the piston 4.
  • the inner and outer parts 56, 57 are similar to the inner and outer parts 16,17 of the piston 4 provided in the electromagnetic pump 1, in that both the inner and outer parts 56, 57 comprises tubular members. Clearance channels 18 are also provided between the inner and outer parts 56, 57.
  • the outer part 57 further comprises a collar 53 against which the first end 33 of the second spring 32 of the second valve 13, abuts. It can be seen from Figure 4a that the outer part 57 comprises chamfered edges 58a,b, and an end 69 of the inner part 56 abuts these chamfered edges 58a,b.
  • the inner part 56 of the piston 4 is substantially located outside of the outer part 57 of the piston.
  • the inner part 56 of the piston 4 further comprises an annular projection 59.
  • One end 6 of the main spring 5 abuts the surface 7 of the inlet 2 and the opposite end 8 of the main spring 5 abuts the annular projection 59 on the inner part 56 of the piston 4, so as to urge the inner part 56 of the piston 4 towards abutting a face 61 of the outer part 56.
  • the inner part 56 of the piston is outside of the outer part 57 of the piston 4 and is held in abutment with the outer part 57 by means of the main spring 5 which is arranged to bias the annular projection 59 towards a face 61 of the outer part 57.
  • the electromagnetic pump 50 is easier to manufacture; since the inner part 56 of the piston 4 is not held by friction within the outer part of the piston 57, the outer diameter of the inner part 56 does not need to be substantially equal to the inner diameter of the outer part 57. Accordingly, this allows for more tolerance in component dimensions during manufacture.
  • Figures 5 and 6 illustrate the electromechanical pump 50 during use.
  • Figure 5 illustrates the electromagnetic pump 50 when the piston 4 has been moved to its first position.
  • Figure 6 illustrates the electromagnetic pump 50 when the piston 4 has been moved to its second position.
  • the electromechanical pump 50 operates in the same manner as described above for electromechanical pump 1.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Electromagnetic Pumps, Or The Like (AREA)

Claims (14)

  1. Pompe électromagnétique (1,50) comprenant :
    une entrée (2) ;
    une sortie (3) ;
    une chambre intermédiaire (11) située entre ladite entrée (2) et ladite sortie (3);
    une première vanne (12) pour contrôler l'écoulement de fluide dans la chambre intermédiaire (11), et une seconde vanne (13) pour contrôler l'écoulement de fluide hors de la chambre intermédiaire (11) ;
    un piston (4), dont au moins une partie comprend un matériau ferromagnétique, situé entre l'entrée (2) et la sortie (3), et comprenant un canal (19) à travers lequel le fluide peut s'écouler, dans lequel le piston (4) est mobile entre une première et une seconde position pour commander l'ouverture et la fermeture des première et seconde soupapes (11, 12) ;
    un ressort principal (5) qui est agencé pour exercer une force contre ledit piston (4) afin de solliciter le piston (4) vers sa première position ;
    une bobine (10) destinée à générer un champ électromagnétique pour déplacer ledit piston (4) vers sa deuxième position, à l'encontre de la force de sollicitation exercée par ledit ressort principal (5);
    un tube d'augmentation de pression (15) avec un diamètre intérieur (d) qui est plus petit qu'un diamètre intérieur (D) de l'entrée (2), de sorte que le fluide s'écoulant de l'entrée (2) dans le tube d'augmentation de pression (15) est mis sous pression ; dans laquelle au moins une partie de la longueur (L) du tube d'augmentation de pression (15) est située à l'intérieur dudit ressort principal (5), caractérisé en ce que le piston comprend une partie intérieure (16) et une partie extérieure (17), dans laquelle la partie intérieure (16) du piston est fixée à l'intérieur de la partie extérieure (17) du piston (4), et dans laquelle le tube d'augmentation de pression (15) est configuré pour s'étendre de l'entrée (2) à l'intérieur de la partie intérieure du piston (4) lorsque le piston (4) est dans la première position.
  2. Pompe électromagnétique selon la revendication 1, dans laquelle ledit tube d'augmentation de pression est situé en amont dudit piston.
  3. Pompe électromagnétique selon la revendication 1 ou 2, dans laquelle ledit tube d'augmentation de pression est intégré à ladite entrée.
  4. Pompe électromagnétique selon l'une quelconque des revendications 1 à 3, dans laquelle ledit tube d'augmentation de pression et ledit piston sont mécaniquement indépendants.
  5. Pompe électromagnétique selon l'une quelconque des revendications 1 à 4, dans laquelle la partie intérieure du piston est en butée contre la partie extérieure du piston, et dans laquelle le ressort principal est agencé pour pousser la partie intérieure contre la partie extérieure.
  6. Pompe électromagnétique selon l'une quelconque des revendications 1 à 5, dans laquelle le piston définit la chambre intermédiaire.
  7. Pompe électromagnétique selon l'une des revendications 1 à 6, dans laquelle le tube d'augmentation de la pression s'étend dans la chambre intermédiaire.
  8. Pompe électromagnétique selon l'une quelconque des revendications 1-7, dans laquelle la première soupape comprend un premier bouchon et un premier ressort et une première extrémité du premier ressort est fixée au piston et un premier bouchon est fixé à une seconde extrémité, opposée, du premier ressort.
  9. Pompe électromagnétique selon l'une quelconque des revendications 1-8, dans laquelle la deuxième soupape comprend un deuxième bouchon et un deuxième ressort et une première extrémité du deuxième ressort est fixée à la sortie ou à une partie extérieure du piston, et le deuxième bouchon est fixé à une seconde extrémité, opposée, du deuxième ressort.
  10. Pompe électromagnétique selon l'une quelconque des revendications 1 à 9, dans laquelle au moins un canal de dégagement est prévu entre la partie intérieure du piston et la partie extérieure du piston.
  11. Pompe électromagnétique selon l'une quelconque des revendications 1 à 10, dans laquelle la partie extérieure du piston est constituée d'un matériau ferromagnétique et la partie intérieure du piston est constituée d'un matériau différent.
  12. Procédé de fabrication d'une pompe à électro-aimant (1,50) selon la revendication 1, le procédé comprenant les étapes consistant à :
    fournir une entrée (2) ;
    fournir une sortie (3) ;
    fournir une chambre intermédiaire (11) entre ladite entrée (2) et ladite sortie (3) ;
    fournir une première vanne (12) pour contrôler l'écoulement de fluide dans la chambre intermédiaire (11), et fournir une deuxième vanne (13) pour contrôler l'écoulement de fluide hors de la chambre intermédiaire (11) ;
    fournir un piston (4) entre l'entrée (2) et la sortie (3), dans laquelle le piston (4) comprend un canal (19) à travers lequel le fluide peut s'écouler et au moins une partie du piston (4) comprend un matériau ferromagnétique, et dans laquelle le piston (4) est mobile entre une première et une seconde position pour contrôler l'ouverture et la fermeture des première et seconde soupapes (12, 13) ;
    fournir un ressort principal (5), et disposer le ressort principal (5) pour exercer une force contre ledit piston (4) afin de solliciter le piston (4) vers sa première position ;
    fournir une bobine (10) pour générer un champ électromagnétique afin de déplacer ledit piston (4) vers sa deuxième position, contre la force de sollicitation exercée par ledit ressort principal (5) ;
    fournir un tube d'augmentation de pression (15) avec un diamètre intérieur (d) qui est plus petit qu'un diamètre intérieur (D) de l'entrée, de sorte que le fluide s'écoulant de l'entrée (2) dans le tube d'augmentation de pression (15) est pressurisé ;
    caractérisé en ce que
    la méthode comprend en outre les étapes suivantes
    fournir un piston (4) qui a une partie intérieure (16) et une partie extérieure (17), dans laquelle la partie intérieure (16) est fixée dans une partie extérieure (17) ;
    disposer le tube d'augmentation de pression (15) de telle sorte qu'au moins une partie de la longueur (L) du tube d'augmentation de pression (15) soit située à l'intérieur dudit ressort principal (5) et
    de telle sorte que le tube d'augmentation de la pression (15) s'étend de l'entrée (2) jusqu'à l'intérieur de la partie intérieure (16) du piston (4), lorsque le piston (4) est dans la première position.
  13. Procédé selon la revendication 12, dans lequel le procédé comprend l'étape consistant à disposer la partie intérieure dans la partie extérieure, de sorte que la partie intérieure soit maintenue par friction dans la partie extérieure du piston.
  14. Procédé selon la revendication 12 ou 13, dans lequel le procédé comprend l'étape consistant à disposer le ressort principal pour pousser la partie intérieure contre la partie extérieure, de sorte que le ressort principal maintienne la partie intérieure en butée avec la partie extérieure du piston.
EP14719308.0A 2013-04-30 2014-04-23 Electromechanical pump Active EP2994639B8 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH8872013 2013-04-30
PCT/EP2014/058268 WO2014177442A1 (fr) 2013-04-30 2014-04-23 Pompe électromécanique

Publications (3)

Publication Number Publication Date
EP2994639A1 EP2994639A1 (fr) 2016-03-16
EP2994639B1 true EP2994639B1 (fr) 2020-12-23
EP2994639B8 EP2994639B8 (fr) 2021-03-10

Family

ID=48569899

Family Applications (1)

Application Number Title Priority Date Filing Date
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Country Link
EP (1) EP2994639B8 (fr)
WO (1) WO2014177442A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH711680B1 (fr) * 2015-10-23 2022-01-14 Gotec Sa Module de chauffage pour pompe à liquide, ensemble d'alimentation en liquide chaud et machine de production de boisson chaude.
EP3336352A1 (fr) 2016-12-15 2018-06-20 Gotec SA Bobine pour pompe electromagnetique
CH713235A2 (fr) 2016-12-15 2018-06-15 Gotec Sa Bobine pour pompe électromagnétique, pompe électromagnétique, procédé de fabrication de bobine et kit de montage de pompe électromagnétique.

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1653426A1 (de) * 1967-03-01 1971-09-02 Otto Eckerle Elektromagnetische Schwingankerpumpe
DE2410768C3 (de) * 1974-03-07 1979-01-18 Danfoss A/S, Nordborg (Daenemark) Elektromagnetische Pumpe

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
EP2994639A1 (fr) 2016-03-16
EP2994639B8 (fr) 2021-03-10
WO2014177442A1 (fr) 2014-11-06

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