Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
  • F16K31/00—Actuating devices; Operating means; Releasing devices
  • F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
  • F16K31/06—Actuating devices; Operating means; Releasing devices electric; magnetic using a magnet, e.g. diaphragm valves, cutting off by means of a liquid
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
  • F23N—REGULATING OR CONTROLLING COMBUSTION
  • F23N1/00—Regulating fuel supply
  • F23N1/005—Regulating fuel supply using electrical or electromechanical means
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
  • F16K31/00—Actuating devices; Operating means; Releasing devices
  • F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
  • F16K31/04—Actuating devices; Operating means; Releasing devices electric; magnetic using a motor
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
  • F23N—REGULATING OR CONTROLLING COMBUSTION
  • F23N2235/00—Valves, nozzles or pumps
  • F23N2235/12—Fuel valves
  • F23N2235/16—Fuel valves variable flow or proportional valves
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
  • F23N—REGULATING OR CONTROLLING COMBUSTION
  • F23N2900/00—Special features of, or arrangements for controlling combustion
  • F23N2900/01002—Electromagnetically operated fuel valves with a single solenoid controlling two or more cores
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
  • F23N—REGULATING OR CONTROLLING COMBUSTION
  • F23N5/00—Systems for controlling combustion
  • F23N5/02—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium
  • F23N5/10—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using thermocouples
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T137/00—Fluid handling
  • Y10T137/1407—Combustion failure responsive fuel safety cut-off for burners
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T137/00—Fluid handling
  • Y10T137/8593—Systems
  • Y10T137/87917—Flow path with serial valves and/or closures

Definitions

• the present invention relates to electromagnetic valves allowing the control of a fluid flow in a fluid circulation path.
• Such valves are used in particular for adjusting the gas flow supplying a burner or a gas boiler.
• Solenoid valves are already known which allow the continuous adjustment of the gas flow rate, by an axial displacement valve cooperating with a seat to determine in the gas passage an adjustable gas passage section between a fully open position and an open position. minimal.
• the solenoid valves allowing the continuous adjustment of gas flow do not provide an adjustment until the total shut-off, and a shut-off valve must be associated with them.
• each of the solenoid valves can ensure total closure of its own passage, the closure of all of the valves ensuring total closure of the gas passage.
• the drawback is a discontinuous adjustment of the gas flow rate, each solenoid valve constituting an adjustment stage.
• continuously variable solenoid valve technology in which the continuously variable solenoid valve is combined with a full shutoff solenoid valve, a safety solenoid valve to ensure double sealing in the event of a power supply fault.
• a double safety electromagnetic valve operating in all or nothing.
• the valve is mounted at the end of a tubular body in which slides an actuating rod itself integral with a magnetic drive core.
• the magnetic drive core is biased by a drive coil which generates a magnetic field causing the axial displacement of the magnetic drive core.
• a second magnetic safety core is axially movable relative to the first magnetic drive core, from which it is separated by a non-magnetic ring.
• the second magnetic safety core is biased by a spring towards the valve, and is magnetically biased by a second safety coil which generates a magnetic field causing the axial displacement of the second safety core.
• the valve is pushed back by a spring towards the valve seat.
• Such a device does not make it possible to continuously adjust the position of the valve facing the seat: the valve operates in all or nothing mode, the valve being able to assume only a fully open position and a closed position, depending on the supply state. coils.
• the magnetic drive core is not integral with the valve, but is connected to the valve by a sliding rod in a cylindrical body itself integral with the valve. Also, in order to open the valve, it is necessary to generate an intense magnetic field to cause the magnetic cores to stick together, which requires powerful and bulky coils.
• the problem highlighted by the present invention is to ensure both continuous adjustment of the fluid flow rate in a fluid circulation path, and good sealing security. in the event of a fault in the electrical supply to the solenoid valves, while fulfilling these functions using a reduced number of solenoid valves and control circuits to simplify the device and reduce its cost.
• Another problem which the invention proposes to solve by certain embodiments is to ensure control of the adjusting solenoid valve by means of a motor, for continuous adjustment and good adjustment precision, while ensuring the automatic return of the motor to the closed position of the solenoid valve without risk of crushing or amplification of the bonding phenomenon of the seals and without risk of slipping or blocking of the motor.
• the invention provides a device for controlling and securing a fluid flow which travels along a path of circulation of fluid passing through a main body of the device, comprising:
• an axial displacement valve cooperating with a seat to determine, in the fluid passage, an adjustable fluid passage section between a fully open position and a closed position
• the connecting rod comprises a first section and a second independent coaxial section, the first section being integral with the valve, the second section being driven by the linear actuator, and the two sections being able to move axially, one with respect to the other between a position of relative closeness and a position of relative distance from the air gap,
• each of the first and second connecting rod sections comprises at least one respective connecting portion made of ferromagnetic material, the two connecting portions being opposite one another according to two respective contact surfaces, a return spring urges the valve and the first section of connecting rod away from the second section of connecting rod to return the valve to the closed position,
• a magnetic excitation coil coupling circuit is magnetically coupled to the connecting portions of the connecting rod sections and is shaped to selectively generate a magnetic field flowing between the two connecting portions of the connecting rod sections, said magnetic field ensuring mutual magnetic attraction of the connecting rod sections towards each other against the return force exerted by the return spring, said magnetic attraction being greater than the return force of the return spring when the two sections are in relative approximation position.
• the supply of the excitation coil maintains the bonding of the connecting rod sections to each other, ensuring the mechanical coupling of the valve to the linear actuator for its functional displacements, and the interruption supplying the excitation coil causes the relative release of the connecting rod sections relative to each other, ensuring the decoupling of the valve which is then returned to the closed position by the return spring whatever or the state of the linear actuator.
• linear actuator designates any element making it possible to axially move the valve continuously in order to bring it and maintain it in any position between the limit positions of full opening and closing, and such a element keeps its fixed position during a power supply interruption.
• a linear actuator is a rotary motor associated with a screw jack.
• the connecting portions of the connecting rod sections comprise respective flat contact surfaces.
• the connecting portions of the connecting rod sections comprise respective frustoconical contact surfaces.
• the linear actuator comprises a motor, for example a stepping motor.
• the device comprises: - a sensor sensitive to the electric current passing through the excitation coil and generating an electrical coupling signal when the magnetic coupling circuit is closed by bringing together and bonding the sections of connecting rod one to the other, - a control circuit of the linear actuator, receiving the electrical coupling signal, and adapted to interrupt the supply of the linear actuator in the direction of its closing upon receipt of said electrical signal from coupling.
• the linear actuator then returns to a perfectly defined closing position without causing excessive tightening of the valve on the seat.
• the closing position of the linear actuator is precisely defined and reproducible. Any risk of blockage of the linear actuator motor is avoided, blocking which would occur during excessive compression of the valve on the seat.
• the magnetic coupling circuit and the excitation coil are specific elements of the main body of the device, the assembly constituting a proportional control valve with safety closure in the event of absence of current supply. electric.
• the device of the invention must, in order to comply with safety standards, be associated with a safety valve with safety valve carried by a movable magnetic core urged by a return spring in the closed position and urged by a valve opening magnetic field generated by a magnetic safety valve circuit and an actuating coil, the safety valve being connected in series in the fluid circulation path, the safety valve actuating coil being electrically supplied simultaneously with the excitation coil of the safety closing control valve.
• the device of the invention further comprises a safety valve with safety valve carried by a movable magnetic core urged by a return spring in the closed position and urged by a magnetic field opening the valve.
• the safety valve being connected in series in the fluid circulation path, the magnetic safety valve circuit being shaped to simultaneously constitute the magnetic coupling circuit of the safety closing control valve and the actuating coil simultaneously fulfilling the excitation coil function of the safety closing control valve.
• FIG. 1 is a schematic sectional view of a fluid flow control and security device according to a first embodiment of the present invention, in the closed position;
• FIG. 1 is a schematic sectional view of the device of Figure 1, in the regulation position;
• FIG. 3 is a schematic sectional view of the device of Figure 1, in the closed position in the event of a power cut;
• FIG. 4 is a schematic sectional view of a fluid flow control and safety device according to a second embodiment of the present invention, in the fully closed position;
• FIG. 5 is a sectional view of the device of Figure 4, in the open position of the safety solenoid valve, the adjusting solenoid valve remaining closed;
• - Figure 6 is a schematic sectional view of the device of Figure 4, in the flow control position; and - Figure 7 is a schematic sectional view of the device of Figure 4, in the position of double safety shutter in case of power cut.
• the fluid flow control and safety device provides on the one hand the function of continuous adjustment of the fluid flow, and on the other hand the automatic shutter function in the absence of electrical supply of the device.
• the device comprises a main body 1 in which a fluid circulation path is provided between an inlet 2 and an outlet 3.
• the fluid path traverses the inlet 2, then an upstream chamber 4 , a downstream chamber 5, an outlet chamber 6, and finally the outlet 3.
• a valve 7 moves axially along the axis II and cooperates with a seat 8 to determine, in the fluid passage, an adjustable fluid passage section between a fully open position and a closed position.
• the shutter position is illustrated in Figure 1.
• the valve 7 is directly mechanically connected by a connecting rod 9 to a linear actuator 10.
• the linear actuator 10 is arranged to axially move the connecting rod 9 and the valve 7 between the fully open and closed positions, and to keep them in any adjustment position chosen between the extreme positions.
• the linear actuator 10 can for example comprise an electric motor, powered by a control circuit 11.
• the connecting rod 9 is in two separate parts, comprising a first section 12 and a second section 13 independent coaxial.
• the first section 12 is integral with the valve 7.
• the second section 13 is driven by the linear actuator 10.
• the first section 12 of connecting rod 9 comprises at least one connecting portion 14 made of ferromagnetic material.
• the second section 13 of connecting rod 9 comprises a connecting portion 15 of ferromagnetic material.
• the two connecting portions 14 and 15 are opposite one another according to two respective contact surfaces 16 and 17.
• a return spring 18 biases the valve 7 and the first section 12 of connecting rod 9 in the direction of the seat 8, that is to say away from the second section 13 of connecting rod 9, until obturation 1 solenoid valve.
• a magnetic coupling circuit 19 with excitation coil 20 is magnetically coupled to the connecting portions 14 and 15 of the sections 12 and 13 of the connecting rod 9.
• the magnetic coupling circuit 19 is shaped to selectively generate a magnetic field circulating between the two connecting portions 14 and 15 of the sections 12 and 13.
• the excitation coil 20 is an annular coil which surrounds the connecting portions 14 and 15 made of ferromagnetic material of the connecting rod 9.
• the magnetic coupling circuit 19, in the shape of a C closes the field lines outside the excitation coil 20 between the two connecting portions 14 and 15, leaving only a small gap between the distal pole 19a and the proximal pole 19b of the magnetic coupling circuit 19 on the one hand and the respective connecting portions 14 and 15 of the connecting rod 9 on the other hand.
• a third air gap E is located at the interface between the respective contact surfaces 16 and 17 of the connecting portions 14 and 15 of connecting rods 9, as best seen in FIG. 3 in the position of relative distance.
• the excitation coil 20 is supplied with electric current by input conductors 21. In the presence of an electric current, the excitation coil 20 creates a magnetic field which, traversing the magnetic coupling circuit 19 and the portions of connection 14 and 15, ensures mutual magnetic attraction of the sections 12 and 13 of the connecting rod 9 towards one another against the return force exerted by the return spring 18.
• the excitation coil 20 and its excitation current are chosen so that the magnetic attraction which is exerted between the two sections 12 and 13 of the connecting rod 9 in the position of relative approximation is greater than the return force of the return spring 18.
• the magnetic flux generated by the excitation coil 20 decreases due to the presence of the air gap, and if it was desired that the supply of the excitation coil 20 provides a mutual magnetic attraction of the sections 12 and 13 greater than the return force exerted by the return spring 18, it would then be necessary to use an excitation coil 20 of high power.
• the volume of the device would then be greatly increased, and the production cost would be higher, as well as the energy consumption to power the coil.
• the device can then be put back into a state of continuous mechanical connection between the linear actuator and the valve by supplying the coil d excitement 20.
• the device In FIG. 1, the device is in the permanent closure position: the valve 7 bears on the seat 8, for complete closure of the fluid circulation path between the upstream chamber 4 and the downstream chamber 5.
• the valve 7 is maintained in this position by the first section 12 of connecting rod 9 which is itself pushed by the spring 18 and by the second section 13 itself urged by the linear actuator 10. The device keeps this state whatever the supply of the excitation coil 20.
• FIG. 2 illustrates the state of the device in normal operation for regulating the flow of fluid: the excitation coil 20 is supplied with electric current, and causes the permanent bonding of the sections 12 and 13 of the connecting rod 9 to the other.
• the linear actuator 10 can move axially along the longitudinal axis II the connecting rod 9 and the valve 7 relative to the seat 8, to continuously adjust the fluid passage section 71 which determines the flow of fluid in the fluid circulation path.
• the valve 7 remains coupled to the linear actuator 10 as long as the electrical supply to the excitation coil 20 is maintained.
• the device assumes the state illustrated in FIG. 3: as a result of the disappearance of electrical supply from the excitation coil 20, the magnetic field traversing the magnetic coupling circuit 19 disappears, so that the magnetic attraction disappears between the sections 12 and 13 of the connecting rod 9.
• the second section 13 remains fixed, its position being determined by the linear actuator 10, which is also fixed by lack of electrical supply.
• the second section 12 is biased by the return spring 18, and moves to the closed position, so that the valve 7 again and automatically rests on the seat 8, ensuring complete closure of 1 solenoid valve.
• the third air gap In this position of FIG. 3, the third air gap
• FIG. 1 makes it possible to interrupt the supply of the actuator as soon as the coupling takes place between the two sections 12 and 13 of the connecting rod 9.
• a sensor 22 is provided, inserted in the input conductors 21 supplying the excitation coil 20, sensitive to the electric current flowing through the excitation coil 20, and generating on its output 23 an electrical coupling signal when the magnetic coupling circuit 19 is closed by bringing together and bonding the sections 12 and 13 of the connecting rod 9 to each other.
• the output 23 of the sensor 22 is connected to an input 24 of the control circuit 11.
• the control circuit 11 of the linear actuator 10 receives the electrical coupling signal, and is adapted to interrupt the supply of the actuator linear 10 in the direction of closing the valve 7 on receipt of said electrical coupling signal.
• the magnetic coupling circuit 19 and the excitation coil 20 are suitable clean elements on the main body 1 of the device, the assembly constituting a safety closing control valve in the event of a lack of current supply. electric.
• the safety closing control valve as illustrated in FIGS. 1 to 3 can be associated with a safety valve, of any known type, connected in series in the circulation path of fluid.
• said control valve with safety closure can be associated with a safety valve valve carried by a movable magnetic core biased by a return spring in the closed position and biased by a magnetic field opening the valve generated. by a magnetic circuit and an actuating coil.
• the actuation coil of the safety valve is electrically supplied simultaneously with the excitation coil 20 of the device of FIGS. 1 to 3.
• a safety closing control valve A is associated, illustrated on the right half of FIG. 4, and a safety closing valve B illustrated on the left half of FIG. 4.
• the closing closing valve A takes the same structure as that defined in the first embodiment of Figures 1 to 3.
• the safety closing control valve A differs in the structure of the magnetic coupling circuit 19 and of the excitation coil generating the magnetic field in the magnetic coupling circuit 19, as this will be explained below.
• the safety valve B is produced in the same main body 1, and is connected in series in the fluid circulation path between a main inlet 25 and the inlet 2 of the safety closing control valve A.
• the safety B comprises a safety valve 26 carried by a movable magnetic core 27 which can slide in the main body 1 along a longitudinal axis II-II to move the safety valve 26 between a closed position, illustrated in FIG.
• the movable magnetic core 27 is biased by a return spring 29, which returns it to the closed position.
• the mobile magnetic core 27 is associated with a fixed magnetic core 30, arranged coaxially along the axis II-II, and from which it is separated by an air gap 31.
• An actuating coil 32 powered by an energy source electric, is arranged around the magnetic cores 27 and 30.
• the magnetic coupling circuit 19 comprises, from the distal pole 19a, a distal plate 119a, a portion of which is at proximity of the mobile magnetic core 27 for its magnetic coupling to said mobile magnetic core 27.
• the magnetic coupling circuit 19 comprises, from the proximal pole 19b, a proximal plate 119b, a portion of which is near the fixed magnetic core 30 for its magnetic coupling.
• the magnetic field generated by the actuating coil 32 thus causes mutual attraction of the fixed magnetic core 30 and the movable magnetic core 27, an attraction which tends to reduce the air gap 31 and to stick the two cores 27 and 30 together. to the other for the opening of the safety valve B.
• the magnetic field generated by the actuating coil 32 propagates in the magnetic coupling circuit 19 to the poles 19a and 19b, then in the portions of connection 14 and 15 of the connection rod 9 to ensure the bonding of the sections 12 and 13 of the connection rod 9 which allows the control of the safety closing control valve A by the linear actuator 10.
• the magnetic circuit of the safety valve B is shaped to simultaneously constitute the magnetic coupling circuit 19 of the safety closing control valve A, and the actuating coil 32 simultaneously fulfills the function of a coil. excitation of the safety closing control valve A.
• the device is in the safety closed position: the safety shutdown control valve A is in the fully closed position, the valve 7 being in abutment against the seat 8.
• the safety valve B is in the closed position, the actuating coil not being supplied, so that the safety valve 26 and the movable magnetic core 27 are pushed back by the return spring 29 which applies the safety valve 26 against the safety seat 28.
• the actuating coil 32 is supplied, which causes the mobile magnetic core 27 to be attracted by the fixed magnetic core 30 and the safety valve 26 to be removed from the safety seat 28 in order to open the passage of the fluid.
• the fluid passage remains blocked by the safety closing control A, the linear actuator 10 of which has not yet been opened.
• the device is in the regulation state: the actuating coil 32 being supplied with electric current, it produces a magnetic field which simultaneously causes the opening of the safety valve B and the bonding of the sections 12 and 13 of the connecting rod 9, the linear actuator 10 acting effectively to move the valve 7 at will relative to the seat 8 to adjust the fluid passage section 71.
• the device then assumes the safety closing state illustrated in FIG. 7: when the magnetic field disappears traversing the magnetic coupling circuit 19, the movable magnetic core 27 and the safety valve 26 are pushed back by the return spring 29 in the closed position, to ensure a first safety closure; simultaneously, the disappearance of the magnetic field in the magnetic coupling circuit 19 causes the separation of the first section 12 of connecting rod 9 from the second section 13, so that the first section 12 of connecting rod 9 and the valve 7 are pushed back by the return spring 18 in the closed position against the seat 8, to automatically ensure a second safety closure.
• this second embodiment is particularly economical for producing a double safety control and safety valve.
• the air gap 31 between the movable magnetic core 27 and the fixed magnetic core 30 is tapered. This shape facilitates the attraction of the mobile magnetic core 27 over a long stroke.
• the third air gap E between the sections 12 and 13 of the connecting rod 9 is limited by two contact surfaces 16 and 17 planar, because the traction between the two sections 12 and 13 does not in principle have to be carried out on a large race.
• the present invention is not limited to the embodiments which have been explicitly described, but it does includes the various variants and generalizations contained in the area of claims below.

Landscapes

• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Magnetically Actuated Valves (AREA)
• Safety Valves (AREA)
• Electrically Driven Valve-Operating Means (AREA)
• Massaging Devices (AREA)
• Valve Device For Special Equipments (AREA)
• Iron Core Of Rotating Electric Machines (AREA)
• Regulation And Control Of Combustion (AREA)
• Lift Valve (AREA)

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• 2001
  • 2001-03-06 FR FR0103130A patent/FR2821915B1/fr not_active Expired - Fee Related
• 2002
  • 2002-03-06 DE DE60219889T patent/DE60219889T2/de not_active Expired - Lifetime
  • 2002-03-06 US US10/471,131 patent/US6848474B2/en not_active Expired - Lifetime
  • 2002-03-06 CN CNB028061713A patent/CN1289845C/zh not_active Expired - Fee Related
  • 2002-03-06 JP JP2002569618A patent/JP2004522916A/ja active Pending
  • 2002-03-06 ES ES02713016T patent/ES2286239T3/es not_active Expired - Lifetime
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  • 2002-03-06 KR KR1020037011593A patent/KR100972522B1/ko not_active Expired - Fee Related
  • 2002-03-06 EP EP02713016A patent/EP1366317B1/fr not_active Expired - Lifetime
  • 2002-03-06 WO PCT/FR2002/000796 patent/WO2002070936A1/fr not_active Ceased
  • 2002-03-06 AT AT02713016T patent/ATE361444T1/de not_active IP Right Cessation
• 2008
  • 2008-01-11 JP JP2008003850A patent/JP4705960B2/ja not_active Expired - Fee Related

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