EP0042900A1 - Device for feeding a liquid-fuel burner - Google Patents

Device for feeding a liquid-fuel burner Download PDF

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Publication number
EP0042900A1
EP0042900A1 EP80400992A EP80400992A EP0042900A1 EP 0042900 A1 EP0042900 A1 EP 0042900A1 EP 80400992 A EP80400992 A EP 80400992A EP 80400992 A EP80400992 A EP 80400992A EP 0042900 A1 EP0042900 A1 EP 0042900A1
Authority
EP
European Patent Office
Prior art keywords
piston
casing
housing
pump
rotation
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.)
Granted
Application number
EP80400992A
Other languages
German (de)
French (fr)
Other versions
EP0042900B1 (en
Inventor
Philippe Jean Maurice Lecerf
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
CESSIONE;COMPAGNIE GENERALE DUCUAUFFAGE S.A.
Original Assignee
Societe Generale de Fonderie SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Societe Generale de Fonderie SA filed Critical Societe Generale de Fonderie SA
Priority to EP80400992A priority Critical patent/EP0042900B1/en
Priority to DE8080400992T priority patent/DE3069285D1/en
Priority to AT80400992T priority patent/ATE9609T1/en
Publication of EP0042900A1 publication Critical patent/EP0042900A1/en
Application granted granted Critical
Publication of EP0042900B1 publication Critical patent/EP0042900B1/en
Expired legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23K—FEEDING FUEL TO COMBUSTION APPARATUS
    • F23K5/00—Feeding or distributing other fuel to combustion apparatus
    • F23K5/02—Liquid fuel
    • F23K5/14—Details thereof
    • F23K5/142—Fuel pumps
    • F23K5/145—Fuel pumps combined with fans
    • 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
    • F04B7/00—Piston machines or pumps characterised by having positively-driven valving
    • F04B7/04—Piston machines or pumps characterised by having positively-driven valving in which the valving is performed by pistons and cylinders coacting to open and close intake or outlet ports
    • F04B7/06—Piston machines or pumps characterised by having positively-driven valving in which the valving is performed by pistons and cylinders coacting to open and close intake or outlet ports the pistons and cylinders being relatively reciprocated and rotated

Definitions

  • the present invention relates to a device which applies in particular to the supply of fuel to burners for domestic boilers.
  • the invention relates to a device for supplying a burner with liquid fuel comprising a simple, light and inexpensive design pump, well suited for low liquid flow rates.
  • the proposed device comprises a pump of the type having a rotary piston driven by a motor, provided with a light and housed in a sealed manner in a casing itself provided with a suction orifice and a discharge orifice capable of communicate periodically and alternately during the rotation of the piston with the lumen thereof, and a cam mechanism interposed between the housing and the rotary piston to define within the housing a cavity of variable volume communicating with the light of the piston .
  • the casing is slidably mounted on the rotary piston and it is urged elastically towards the piston while being substantially immobilized in rotation.
  • the invention is correlative to the fact that, for this pump intended to operate at low pressures, it suffices to use an extremely light casing; this therefore generates low axial dynamic forces, and can be associated with a weak return spring, so that the dynamic and return forces remain without undesirable repercussions on the cam mechanism and on the rotary piston.
  • the mobile casing is easily removable to allow control or replacement of the cam mechanism. In addition, it facilitates rapid stopping of the pump.
  • the piston can advantageously consist of the motor shaft, the cam mechanism being formed by machining the end of the shaft.
  • the pump according to the invention thus takes advantage of the excellent tolerances of the drive shafts.
  • This cam mechanism may include an adjustable stop associated with the casing, supported on a Cam surface proper and for adjusting the axial stroke of the housing.
  • the adjustable stop can very simply be constituted by a screw or other adjustment piece attached to the blind bottom of the casing, offset relative to the axis of rotation of the piston so as to allow simple manual adjustment of the axial stroke of the casing and therefore of the relation between the flow of the pump and the speed of rotation of its drive motor.
  • the movable casing of the pump can be made of a metallic material or preferably plastic. It may have a tapered configuration on the side of the rotary piston so as to have a thinned end, endowed with radial elasticity, if necessary carrying an annular necking piece, and capable of causing the sealed application of said end on the piston. .
  • the sealing thus produced in a simple manner makes it possible to further reduce the weight of the casing and correspondingly to reduce the force of the return spring or to increase the stroke of the casing and consequently the flow rate of the pump.
  • the radial elasticity of the end of the housing makes it easier to self-center it on the motor shaft.
  • the pump drive motor can be of the type with axial translation of the rotor when starting and stopping, which allows frank operation and interruption of pumping without the need for a special solenoid valve.
  • the fan can produce on the shaft at start and stop an axial thrust sufficient to produce a decoupling translation of the piston relative to the casing.
  • the low-flow pump of the liquid fuel supply device comprises a casing 10 disposed axially movable on a rotary piston 20.
  • the casing 10 has a cylindrical cavity 10a open on the left and closed on the right on a blind bottom 10b.
  • the blind bottom is equipped with a flow adjustment piece, for example of an eccentric screw 13 which is mounted in leaktight manner and which bears in an offset manner at its end situated in the cavity 10a a support for example constituted by a ball joint 14.
  • the casing Made of a light material, metallic or preferably plastic with low coefficient of friction, the casing cooperates by its bottom 10b with a helical or conical return spring 15, producing a relatively weak axial effect.
  • the suction and discharge conduits 11a, 12a connected to the orifices 11, 12, are constituted by hoses preventing any significant rotation of the casing while, in addition to its return function, the spring 15 contributes to preventing such rotation due to the fact that one of its ends 15a associated with the casing is immobilized by abutment or embedding on the bottom 10b while its other end 15b is associated with an element 16 of the frame of the device.
  • the spring can be constituted by a leaf spring or an elastomer support element.
  • the housing 10 is slidably and sealingly mounted on the rotary piston 20.
  • the sealing is carried out by means of an elastomeric lip seal with radial contact 19 or with tangential contact of a type customary for shaft seals rotating or by means of an O-ring supporting the inner ring in "Teflon".
  • the rotary piston 20 is directly machined on the shaft of an electric motor 27 driving on the side opposite the pump a fan 40 for supplying combustion air.
  • the head 21 of the piston 20 has a lumen 22 in the form of a ring segment of less than 180 ° and an oblique face 23 forming a cam surface inclined at an angle a on a plane perpendicular to the axis of rotation of the piston.
  • the ball 14 of the adjustable stop 13 normally comes to bear on the cam surface 23 under the effect of the return spring 15.
  • the pump illustrated in Figures 1 and 2 operates as follows.
  • the chamber 25 defined between the housing and the piston has its maximum volume; the rotation of the piston in the direction indicated cuts the communication between the light 22 and the suction port 11 and prepares to open the communication between the light and the discharge port 12 (FIG. 1A), while the surface cam tends to cause translation of the housing 10 to its position of Figure 2.
  • the chamber 25 takes its minimum volume and the communication between the light 22 and the orifice 12 is cut ( Figure 2A).
  • the piston continues to rotate, the light is again open on the orifice 11 and the fuel is sucked into the chamber 25 until one returns to the position of FIG. 1.
  • Figures 3 and 3A show how the screw 13 and the ball 14 allow manual adjustment of the flow rate.
  • the ball 14 is applied to the cam surface 23 at a point defining a maximum stroke C1 between the casing 10 and the piston 20; in the position of Figure 3A which is obtained by simple rotation of a half-turn of the screw 13, the ball 14 is applied to the surface 23 at a point defining a course C2 much shorter.
  • the stop contact remains effective between the ball 14 and the surface 23 regardless of the adjustment position.
  • FIGS. 4 and 4A show a supply device with operation and frank interruption of the pumping so as to avoid the dripping of the fuel out of the spraying member between the moment when the stop order is given to the engine and the moment when the rotor 29 of the motor 27 stops definitively.
  • the motor comprises a stator 28 and the motor shaft comprises on the side opposite the pump two shoulders 30, 31 for limiting the stroke cooperating with a stop 32 integral with the frame.
  • a shoulder 10c of the casing 10 of the pump is applied at rest by the return spring 15 against a stop 18 secured to the stator ( Figure 4) or to the frame ( Figure 4A). It goes without saying that the stops described, in particular the stop 18, can be axially adjustable.
  • the axial translation of the rotor when starting and stopping is obtained by means of the fan 40 by the simple use of the axial force of aeraulic origin exerted on the blades and therefore on the fan shaft.
  • the cam surface 23 or 42a can be of treated steel, the ball can be a steel ball 14 or 43 trapped in a cell of its support so as to be able to pivot freely and / or provided with a flat wear zone of so as to avoid punctual contact.
  • the ball can also be simply crimped onto the end of the screw 13 or of an equivalent adjustment part or even onto the blind bottom of the casing.
  • FIGS. 5 and 5A comprises a washer 42, one face 42b of which is in abutment against a ball 43 crimped or pivotally mounted in the end of the rotary piston 20.
  • the other face of the washer is in abutment against two stops associated with the blind bottom of the casing; one of the stops 41 constitutes the adjustable stop which makes it possible to vary by action on the screw 13 the angle of inclination a 'of the face 42a relative to the axis of the piston 20; the other stop 44 serves as a point or preferably linear support in order to define for the washer a pivot axis contained in a plane perpendicular to the piston axis.
  • the wall of the housing is thinned at 10c on the side of the motor 27 so as to provide at the end of the housing an elastic annular zone 10d applied with self-centering on the piston 20.
  • a clamping ring 50 possibly retained by a stop 51.
  • the ring 50 tightly tightens the zone 10d of the casing on the piston 20.
  • the casing thus lightened makes it possible to use an even weaker spring 15 or, for the same spring, to increase the useful axial stroke.
  • a seal 52 is associated with the adjustable stop screw or finger 13.
  • the radial elasticity of the zone 10d is sufficient to produce the desired seal by pinching the piston 20 and the constriction means 50 can therefore be eliminated.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Feeding And Controlling Fuel (AREA)
  • Reciprocating Pumps (AREA)

Abstract

1. A device for feeding a liquid-fuel burner, comprising a pump with a rotary piston (20) provided with a cut-away portion (22) and accommodated in a pressure tight manner in a housing (10) itself provided with an inlet port (11) and a delivery port (12) adapted to communicate periodically and alternately during rotation of the piston with the cut-away portion there of, and a cam mechanism (13, 14, 23) interposed between the housing (10) and the rotary piston (20), and defining internally of the housing (10) a variable volume of space communicating with the cut-away portion of the piston, and a motor (27) for driving the piston in rotation, characterized by the fact that the piston (20) is constituted by the motor shaft, on which the housing (10) is slidingly mounted, whilst being resiliently urged towards the motor shaft (20) by a weak return spring (15), whilst flexible connections (11a, 12a) connect the inlet and delivery ports of the body, substantially rotationally held, to fixed parts.

Description

La présente invention concerne un dispositif qui s'applique notamment à l'alimentation en combustible des brûleurs pour chaudières domestiques.The present invention relates to a device which applies in particular to the supply of fuel to burners for domestic boilers.

Différents facteurs, en particulier l'amélioration de l'isolation des bâtiments, font que de nos jours le débit moyen demandé à une pompe d'alimentation en combustible liquide pour brûleur de chaudière domestique tend à décroître pour devenir inférieur à 2,5 litres/heure.Various factors, in particular the improvement in the insulation of buildings, mean that today the average flow rate required from a liquid fuel supply pump for a domestic boiler burner tends to decrease to less than 2.5 liters / hour.

Les pompes classiques à engrenages, adaptées à des débits plus importants, demandent aux faibles débits un couple moteur trop élevé et sont d'un prix de revient excessif.Conventional gear pumps, suitable for higher flow rates, require too high motor torque at low flow rates and are excessively costly.

Il est connu d'utiliser pour véhiculer des fluides autres que les liquides combustibles des pompes dites à piston axial susceptibles de procurer de faibles débits proportionnels à la vitesse de rotation. Du fait que la translation axiale du piston doit être commandée par un piston rotatif supplémentaire ou, dans le cas où le piston axial est animé d'un mouvement combiné de translation et de rotation, par des engrenages à longues dentures, les pompes connues sont compliquées, onéreuses et peu aisées à démonter.It is known practice to use so-called axial piston pumps capable of providing low flow rates proportional to the speed of rotation for conveying fluids other than combustible liquids. Because the axial translation of the piston must be controlled by an additional rotary piston or, in the case where the axial piston is driven by a combined movement of translation and rotation, by gears with long teeth, the known pumps are complicated , expensive and not easy to dismantle.

L'invention vise un dispositif d'alimentation d'un brtlleur en combustible liquide comprenant une pompe de conception simple, légère et peu onéreuse, bien adaptée à de faibles débits de liquide.The invention relates to a device for supplying a burner with liquid fuel comprising a simple, light and inexpensive design pump, well suited for low liquid flow rates.

Le dispositif proposé comprend une pompe du type présentant un piston rotatif entrainé par un moteur, muni d'une lumière et logé de façon étanche dans un carter lui-même pourvu d'un orifice 'd'aspiration et d'un orifice de refoulement susceptibles de communiquer périodiquement et alternativement au cours de la rotation du piston avec la lumière de celui-ci, et un mécanisme à came interposé entre le carter et le piston rotatif pour définir au sein du carter une cavité de volume variable communiquant avec la lumière du piston.The proposed device comprises a pump of the type having a rotary piston driven by a motor, provided with a light and housed in a sealed manner in a casing itself provided with a suction orifice and a discharge orifice capable of communicate periodically and alternately during the rotation of the piston with the lumen thereof, and a cam mechanism interposed between the housing and the rotary piston to define within the housing a cavity of variable volume communicating with the light of the piston .

Selon l'invention, le carter est monté à coulissement sur le piston rotatif et il est sollicité élastiquement vers le piston tout en étant sensiblement immobilisé en rotation.According to the invention, the casing is slidably mounted on the rotary piston and it is urged elastically towards the piston while being substantially immobilized in rotation.

L'invention est corrélative au'fait que, pour cette pompe destinée à fonctionner à de faibles pressions, il suffit de recourir à un carter extrêmement léger ; celui-ci engendre donc de faibles efforts dynamiques axiaux, et peut être associé à un faible ressort de rappel, de sorte que les efforts dynamiques et de rappel restent sans répercussion fâcheuse sur le mécanisme à came et sur le piston rotatif. Le carter mobile est aisément démontable pour permettre un contrôle ou un remplacement du mécanisme à came. De plus, il facilite l'arrêt rapide de la pompe.The invention is correlative to the fact that, for this pump intended to operate at low pressures, it suffices to use an extremely light casing; this therefore generates low axial dynamic forces, and can be associated with a weak return spring, so that the dynamic and return forces remain without undesirable repercussions on the cam mechanism and on the rotary piston. The mobile casing is easily removable to allow control or replacement of the cam mechanism. In addition, it facilitates rapid stopping of the pump.

Le piston peut avantageusement être constitué par l'arbre du moteur, le mécanisme à came étant formé par usinage de l'extrémité de l'arbre. La pompe selon l'invention tire ainsi parti des excellentes tolérances des arbres moteurs.The piston can advantageously consist of the motor shaft, the cam mechanism being formed by machining the end of the shaft. The pump according to the invention thus takes advantage of the excellent tolerances of the drive shafts.

Ce mécanisme à came peut comprendre une butée réglable associée au carter, en appui sur une surface de came proprement dite et permettant de régler la course axiale du carter. La butée réglable peut très simplement être constituée par une vis ou une autre pièce de réglage rapportée au fond borgne du carter, décentrée par rapport à l'axe de rotation du piston de façon à permettre un ajustement manuel simple de la course axiale du carter et donc de la relation entre le débit de la pompe et la vitesse de rotation de son moteur d'entraînement.This cam mechanism may include an adjustable stop associated with the casing, supported on a Cam surface proper and for adjusting the axial stroke of the housing. The adjustable stop can very simply be constituted by a screw or other adjustment piece attached to the blind bottom of the casing, offset relative to the axis of rotation of the piston so as to allow simple manual adjustment of the axial stroke of the casing and therefore of the relation between the flow of the pump and the speed of rotation of its drive motor.

Le carter mobile de la pompe peut être réalisé en un matériau métallique ou de préférence en matière plastique. Il peut être de configuration effilée du côté du piston rotatif de façon à présenter une extrémité amincie, douée d'une élasticité radiale, portant le cas échéant une pièce annulaire de striction, et susceptible de provoquer l'application étanche de ladite extrémité sur le piston.The movable casing of the pump can be made of a metallic material or preferably plastic. It may have a tapered configuration on the side of the rotary piston so as to have a thinned end, endowed with radial elasticity, if necessary carrying an annular necking piece, and capable of causing the sealed application of said end on the piston. .

L'étanchéité ainsi réalisée de manière simple permet de diminuer encore le poids du carter et corrélativement de réduire l'effort du ressort de rappel ou d'augmenter la course du carter et par suite le débit de la pompe. De plus, l'élasticité radiale de l'extrémité du carter permet plus facilement un auto-centrage de celui-ci sur l'arbre moteur.The sealing thus produced in a simple manner makes it possible to further reduce the weight of the casing and correspondingly to reduce the force of the return spring or to increase the stroke of the casing and consequently the flow rate of the pump. In addition, the radial elasticity of the end of the housing makes it easier to self-center it on the motor shaft.

Le moteur d'entraînement de la pompe peut être du type à translation axiale du rotor au démarrage et à l'arrêt, ce qui permet une mise en oeuvre et une interruption franches du pompage sans nécessiter d'électrovanne spéciale.The pump drive motor can be of the type with axial translation of the rotor when starting and stopping, which allows frank operation and interruption of pumping without the need for a special solenoid valve.

Lorsque l'arbre du moteur entraîne également un ventilateur d'alimentation en air, le ventilateur peut produire sur l'arbre au démarrage et à l'arrêt une poussée axiale suffisant à produire une translation de découplage du piston par rapport au carter.When the motor shaft also drives an air supply fan, the fan can produce on the shaft at start and stop an axial thrust sufficient to produce a decoupling translation of the piston relative to the casing.

D'autres caractéristiques et avantages de l'invention apparaitront à la lecture de la description détaillée qui va suivre, faite en référence aux dessins annexés, donnés uniquement pour illustrer à titre non limitatif différents modes de réalisation de l'invention, et sur lesquels :

  • . Les Figures 1 et 2 sont des vues en coupe longitudinale partielle d'un premier mode de réalisation du dispositif d'alimentation à pompe simplifiée selon l'invention ;
  • - . Les Figures 1A et 2A étant des coupes transversales correspondantes :
  • . Les Figures 3 et 3A sont des coupes longitudinales partielles montrant comment on peut régler le débit de la pompe par action sur la butée réglable 13 ;
  • . Les Figures 4 et 4A montrent un dispositif d'alimentation pour brûleur, dans lequel la mise en oeuvre et l'interruption franches du pompage sont assurées par effets électromagnétiques dans le moteur ;
  • . Les Figures 5 et 5A sont des vues en coupe longitudinale partielle et en coupe transversale d'un second mode de réalisation de l'invention ; et
  • . La Figure 6 est une vue en coupe d'une variante du carter.
Other features and benefits of the invention will appear on reading the detailed description which follows, made with reference to the accompanying drawings, given solely to illustrate, without limitation, various embodiments of the invention, and in which:
  • . Figures 1 and 2 are views in partial longitudinal section of a first embodiment of the simplified pump supply device according to the invention;
  • -. Figures 1A and 2A being corresponding cross sections:
  • . Figures 3 and 3A are partial longitudinal sections showing how the flow rate of the pump can be adjusted by action on the adjustable stop 13;
  • . FIGS. 4 and 4A show a supply device for a burner, in which the frank operation and interruption of pumping are ensured by electromagnetic effects in the engine;
  • . Figures 5 and 5A are views in partial longitudinal section and in cross section of a second embodiment of the invention; and
  • . Figure 6 is a sectional view of a variant of the housing.

Dans le premier mode de réalisation de l'invention (Figures 1, 1A, 2 et 2A), la pompe à faible débit du dispositif d'alimentation en combustible liquide comprend un carter 10 disposé axialement mobile sur un piston rotatif 20.In the first embodiment of the invention (FIGS. 1, 1A, 2 and 2A), the low-flow pump of the liquid fuel supply device comprises a casing 10 disposed axially movable on a rotary piston 20.

Muni d'un orifice d'aspiration 11 à partir d'un réservoir et d'un orifice de refoulement 12 vers un organe de pulvérisation, le carter 10 présente une cavité cylindrique 10a ouverte à gauche et fermée à droite sur un fond borgne 10b. Le fond borgne est équipé d'une pièce de réglage de débit, par exemple d'une vis excentrée 13 qui est montée de manière étanche et qui porte de manière désaxée à son extrémité située dans la cavité 10a un appui par exemple constitué par une rotule à bille 14. Réalisé en un matériau léger, métallique ou de préférence plastique à faible coefficient de frottement, le carter coopère par son fond 10b avec un ressort de rappel hélicoïdal ou conique 15, produisant un effet axial relativement faible.Provided with a suction orifice 11 from a reservoir and a discharge orifice 12 towards a spraying member, the casing 10 has a cylindrical cavity 10a open on the left and closed on the right on a blind bottom 10b. The blind bottom is equipped with a flow adjustment piece, for example of an eccentric screw 13 which is mounted in leaktight manner and which bears in an offset manner at its end situated in the cavity 10a a support for example constituted by a ball joint 14. Made of a light material, metallic or preferably plastic with low coefficient of friction, the casing cooperates by its bottom 10b with a helical or conical return spring 15, producing a relatively weak axial effect.

Les conduits d'aspiration et de refoulement 11a, 12a raccordés aux orifices 11, 12, sont constitués par des flexibles empêchant toute rotation notable du carter tandis qu'en sus de sa fonction de rappel le ressort 15 contribue à empêcher une telle rotation du fait que l'une de ses extrémités 15a associée au carter est immobilisée par butée ou encastrement sur le fond 10b tandis que son autre extrémité 15b est associée à un élément 16 du bâti du dispositif.The suction and discharge conduits 11a, 12a connected to the orifices 11, 12, are constituted by hoses preventing any significant rotation of the casing while, in addition to its return function, the spring 15 contributes to preventing such rotation due to the fact that one of its ends 15a associated with the casing is immobilized by abutment or embedding on the bottom 10b while its other end 15b is associated with an element 16 of the frame of the device.

Il va de soi que le ressort peut être constitué par un ressort à lame ou un élément d'appui en élastomère.It goes without saying that the spring can be constituted by a leaf spring or an elastomer support element.

Le carter 10 est monté à coulissement et de manière étanche sur le piston rotatif 20. L'étanchéité est réalisée au moyen d'un joint à lèvre élastomère à contact radial 19 ou à contact tangentiel d'un type usuel pour les étanchéités d'arbres rotatifs ou au moyen d'un joint torique support de bague intérieure en "Téflon". Le piston rotatif 20 est directement usiné sur l'arbre d'un moteur électrique 27 entrainant du côté opposé à la pompe un ventilateur 40 d'alimentation en air comburant.The housing 10 is slidably and sealingly mounted on the rotary piston 20. The sealing is carried out by means of an elastomeric lip seal with radial contact 19 or with tangential contact of a type customary for shaft seals rotating or by means of an O-ring supporting the inner ring in "Teflon". The rotary piston 20 is directly machined on the shaft of an electric motor 27 driving on the side opposite the pump a fan 40 for supplying combustion air.

La tête 21 du piston 20 présente une lumière 22 en forme de segment d'anneau inférieur à 180° et une face oblique 23 formant une surface de came inclinée d'un angle a sur un plan perpendiculaire à l'axe de rotation du piston.The head 21 of the piston 20 has a lumen 22 in the form of a ring segment of less than 180 ° and an oblique face 23 forming a cam surface inclined at an angle a on a plane perpendicular to the axis of rotation of the piston.

La bille 14 de la butée réglable 13 vient normalement en appui sur la surface de came 23 sous l'effet du ressort de rappel 15.The ball 14 of the adjustable stop 13 normally comes to bear on the cam surface 23 under the effect of the return spring 15.

La pompe illustrée sur les Figures 1 et 2 fonctionne comme suit. Dans la position de la Figure 1, la chambre 25 définie entre le carter et le piston possède son volume maximal ; la rotation du piston dans le sens indiqué vient couper la communication entre la lumière 22 et l'orifice d'aspiration 11 et se prépare à ouvrir la communication entre la lumière et l'orifice de refoulement 12 (Figure 1A), cependant que la surface de came tend à provoquer la translation du carter 10 vers sa position de la Figure 2. Dans cette position, la chambre 25 prend son volume minimal et la communication entre la lumière 22 et l'orifice 12 est coupée (Figure 2A). Lorsque le piston poursuit sa rotation, la lumière est à nouveau ouverte sur l'orifice 11 et le combustible est aspiré dans la chambre 25 jusqu'à ce qu'on revienne à la position de la Figure 1.The pump illustrated in Figures 1 and 2 operates as follows. In the position of Figure 1, the chamber 25 defined between the housing and the piston has its maximum volume; the rotation of the piston in the direction indicated cuts the communication between the light 22 and the suction port 11 and prepares to open the communication between the light and the discharge port 12 (FIG. 1A), while the surface cam tends to cause translation of the housing 10 to its position of Figure 2. In this position, the chamber 25 takes its minimum volume and the communication between the light 22 and the orifice 12 is cut (Figure 2A). When the piston continues to rotate, the light is again open on the orifice 11 and the fuel is sucked into the chamber 25 until one returns to the position of FIG. 1.

Les Figures 3 et 3A montrent comment la vis 13 et la bille 14 permettent le réglage manuel du débit. Sur la-Figure 3, la bille 14 est appliquée sur la surface de came 23 en un point définissant une course C1 maximale entre le carter 10 et le piston 20 ; dans la position de la Figure 3A qui s'obtient par simple rotation d'un demi-tour de la vis 13, la bille 14 est appliquée sur la surface 23 en un point définissant une course C2 nettement plus faible. Le contact de butée reste effectif entre la bille 14 et la surface 23 quelle que soit la position de réglage.Figures 3 and 3A show how the screw 13 and the ball 14 allow manual adjustment of the flow rate. In FIG. 3, the ball 14 is applied to the cam surface 23 at a point defining a maximum stroke C1 between the casing 10 and the piston 20; in the position of Figure 3A which is obtained by simple rotation of a half-turn of the screw 13, the ball 14 is applied to the surface 23 at a point defining a course C2 much shorter. The stop contact remains effective between the ball 14 and the surface 23 regardless of the adjustment position.

Outre l'ajustement manuel du débit au moyen de la vis 13, on peut opérer une régulation proportionnelle du débit de la pompe en agissant directement sur la vitesse de rotation du moteur.In addition to the manual adjustment of the flow rate by means of the screw 13, it is possible to operate a proportional regulation of the flow rate of the pump by acting directly on the speed of rotation of the motor.

Du fait que la pompe décrite fonctionne à faible débit et donc avec une course de carter réduite, les sollicitations alternées des flexibles de raccordement des orifices 11 et 12 avec l'aspiration et le refoulement n'entrainent sur ces flexibles que des contraintes réduites non préjudiciables à la longévité de l'ensemble.Because the described pump operates at low flow rate and therefore with a reduced crankcase stroke, the alternating stresses of the flexible hoses for connection of the orifices 11 and 12 with the suction and the discharge only cause these stresses reduced stresses which are not detrimental to the longevity of the assembly.

Les Figures 4 et 4A montrent un dispositif d'alimentation à mise en oeuvre et interruption franche du pompage de façon à éviter l'égouttement du combustible hors de l'organe de pulvérisation entre le moment où l'ordre d'arrêt est donné au moteur et le moment où le rotor 29 du moteur 27 s'arrête définitivement. Le moteur comprend un stator 28 et l'arbre du moteur comprend du côté opposé à la pompe deux épaulements 30, 31 de limitation de course coopérant avec une butée 32 solidaire du bâti.FIGS. 4 and 4A show a supply device with operation and frank interruption of the pumping so as to avoid the dripping of the fuel out of the spraying member between the moment when the stop order is given to the engine and the moment when the rotor 29 of the motor 27 stops definitively. The motor comprises a stator 28 and the motor shaft comprises on the side opposite the pump two shoulders 30, 31 for limiting the stroke cooperating with a stop 32 integral with the frame.

Un ressort 35 monté entre une butée 33 et l'arbre moteur ou le rotor 29 sollicite au repos l'épaulement 31 contre une butée 32 (Figure 4) de sorte que le rotor 29 est décalé axialement par rapport au stator 28. Un épaulement 10c du carter 10 de la pompe est appliqué au repos par le ressort de rappel 15 contre une butée 18 solidaire du stator (Figure 4) ou du bâti (Figure 4A). Il va de soi que les butées décrites, notamment la butée 18, peuvent être axialement réglables.A spring 35 mounted between a stop 33 and the drive shaft or the rotor 29 urges the shoulder 31 at rest against a stop 32 (Figure 4) so that the rotor 29 is offset axially relative to the stator 28. A shoulder 10c of the casing 10 of the pump is applied at rest by the return spring 15 against a stop 18 secured to the stator (Figure 4) or to the frame (Figure 4A). It goes without saying that the stops described, in particular the stop 18, can be axially adjustable.

A la mise en marche du moteur, le champ produit par le stator 28 attire le rotor 29 et celui-ci comprime le ressort de découplage 35, la surface de came 23 étant dès lors appliquée contre la butée réglable 14, si bien que la pompe est mise en oeuvre.When the engine is started, the field produced by the stator 28 attracts the rotor 29 and the latter compresses the decoupling spring 35, the cam surface 23 being therefore applied against the adjustable stop 14, so that the pump is implemented.

A l'arrêt du moteur le rotor 29 continue de tourner, mais recule brutalement vers la gauche jusqu'à l'application de l'épaulement 31 contre la butée 32. Le piston 20 est découplé de la butée 14, ce qui arrête immédiatement le fonctionnement de la pompe et l'alimentation du brûleur. En même temps, le couple de rotation transmis par le piston 20 au carter 10 dispa- rait et les ressorts 15 et 35 se détendent pour revenir à la position de repos de la Figure 4.When the engine stops, the rotor 29 continues to turn, but abruptly reverses to the left until the shoulder 31 is applied against the stop 32. The piston 20 is decoupled from the stop 14, which immediately stops the pump operation and the burner supply. At the same time, the torque transmitted by the piston 20 to the casing 10 disappears and the springs 15 and 35 relax to return to the rest position of FIG. 4.

Dans une variante simple, la translation axiale du rotor au démarrage et à l'arrêt est obtenue au moyen du ventilateur 40 par la simple utilisation de l'effort axial d'origine aéraulique exercé sur les aubes et donc sur l'arbre du ventilateur.In a simple variant, the axial translation of the rotor when starting and stopping is obtained by means of the fan 40 by the simple use of the axial force of aeraulic origin exerted on the blades and therefore on the fan shaft.

Il va de soi que la translation du rotor du moteur doit être supérieure à la course du carter de la pompe, un ressort de rappel ou un moyen équivalent devant ramener au repos le piston dans sa position de découplage.It goes without saying that the translation of the motor rotor must be greater than the stroke of the pump housing, a return spring or equivalent means having to bring the piston to rest in its decoupling position.

En raison du manque de linéarité produit aux faibles vitesses dans les moteurs à décalage axial de rotor, il peut être souhaitable pour certaines applications de réaliser la fonction d'arrêt rapide de la pompe au moyen d'une électrovanne d'arrêt disposée sur la conduite de refoulement du liquide. Dans ce cas, la pression qui se forme dans la chambre 25 dès la fermeture de l'électrovanne entraine un découplage automatique du carter à partir du piston sous l'effet de la compression du faible ressort 15.Due to the lack of linearity produced at low speeds in motors with axial rotor shift, it may be desirable for certain applications to realize the quick stop function of the pump by means of a stop solenoid valve placed on the line. liquid delivery. In this case, the pressure which forms in the chamber 25 as soon as the solenoid valve is closed causes an automatic decoupling of the casing from the piston under the effect of the compression of the weak spring 15.

Lorsqu'on désire obtenir un démarrage de la pompe retardé par rapport au démarrage du moteur, il est préférable de recourir à la translation axiale du rotor au moyen du ventilateur, puisque celui-ci ne produit un effet axial supérieur à celui du ressort que pour un nombre déterminé de tours du moteur. Il est avantageux de combiner les efforts de décalage sous l'effet du moteur et sous l'effet du ventilateur de façon à obtenir un démarrage de pompe retardé par rapport au démarrage du rotor et un arrêt de pompe précédant l'arrêt du rotor.When it is desired to obtain a delayed start-up of the pump relative to the start-up of the motor, it is preferable to resort to axial translation of the rotor by means of the fan, since the latter produces an axial effect greater than that of the spring only for a specified number of engine revolutions. It is advantageous to combine the offset forces under the effect of the motor and under the effect of the fan so as to obtain a delayed pump start with respect to the rotor start and a pump stop before the rotor stops.

La surface de came 23 ou 42a peut être en acier traité, La bille peut être une bille en acier 14 ou 43 emprisonnée dans un alvéole de son support de façon à pouvoir pivoter librement et/ou munie d'une zone d'usure plane de manière à éviter un contact ponctuel. La bille peut également être simplement sertie sur l'extrémité de la vis 13 ou d'une pièce de réglage équivalente ou même sur le fond borgne du carter.The cam surface 23 or 42a can be of treated steel, the ball can be a steel ball 14 or 43 trapped in a cell of its support so as to be able to pivot freely and / or provided with a flat wear zone of so as to avoid punctual contact. The ball can also be simply crimped onto the end of the screw 13 or of an equivalent adjustment part or even onto the blind bottom of the casing.

Le mode de réalisation illustré par les Figures 5 et 5A comprend une rondelle 42 dont une face 42b est en appui contre une bille 43 sertie ou montée à pivotement dans l'extrémité du piston rotatif 20. L'autre face de la rondelle est en appui contre deux butées associées au fond borgne du carter ; l'une des butées 41 constitue la butée réglable qui permet de faire varier par action sur la vis 13 l'angle d'inclinaison a' de la face 42a par rapport à l'axe du piston 20 ; l'autre butée 44 sert d'appui ponctuel ou de préférence linéaire afin de définir pour la rondelle un axe de pivotement contenu dans un plan perpendiculaire à l'axe de piston.The embodiment illustrated in FIGS. 5 and 5A comprises a washer 42, one face 42b of which is in abutment against a ball 43 crimped or pivotally mounted in the end of the rotary piston 20. The other face of the washer is in abutment against two stops associated with the blind bottom of the casing; one of the stops 41 constitutes the adjustable stop which makes it possible to vary by action on the screw 13 the angle of inclination a 'of the face 42a relative to the axis of the piston 20; the other stop 44 serves as a point or preferably linear support in order to define for the washer a pivot axis contained in a plane perpendicular to the piston axis.

Dans le mode de réalisation de la Figure 6, la paroi du carter est amincie en 10c du côté du moteur 27 de façon à ménager à l'extrémité du carter une zone annulaire élastique 10d appliquée avec auto-centrage sur le piston 20. Sur la zone 10d est monté un anneau de serrage 50 éventuellement retenue par une butée 51. Constitué par exemple par un joint torique, un jonc ou un ressort annulaire, l'anneau 50 serre de façon étanche la zone 10d du carter sur le piston 20. Le carter ainsi allégé permet d'utiliser un ressort 15 encore plus faible ou, pour un même ressort, d'augmenter la course axiale utile. Un joint d'étanchéité 52 est associé à la vis ou au doigt de butée réglable 13.In the embodiment of Figure 6, the wall of the housing is thinned at 10c on the side of the motor 27 so as to provide at the end of the housing an elastic annular zone 10d applied with self-centering on the piston 20. On the zone 10d is mounted a clamping ring 50 possibly retained by a stop 51. Constituted for example by an O-ring, a ring or an annular spring, the ring 50 tightly tightens the zone 10d of the casing on the piston 20. The casing thus lightened makes it possible to use an even weaker spring 15 or, for the same spring, to increase the useful axial stroke. A seal 52 is associated with the adjustable stop screw or finger 13.

Dans certains cas, l'élasticité radiale de la zone 10d est suffisante pour produire par pincement du piston 20 l'étanchéité souhaitée et le moyen de striction 50 peut donc être supprimé.In certain cases, the radial elasticity of the zone 10d is sufficient to produce the desired seal by pinching the piston 20 and the constriction means 50 can therefore be eliminated.

Claims (10)

1. Dispositif d'alimentation d'un brûleur en combustible liquide, comprenant une pompe à piston rotatif muni d'une lumière et logé de façon étanche dans un carter lui-même pourvu d'un orifice d'aspiration et d'un orifice de refoulement susceptibles de communiquer périodiquement et alternativement au cours de la rotation du piston avec la lumière de celui-ci, et un mécanisme à came interposé entre le carter et le piston rotatif, et définissant au sein du carter une activité de volume variable communiquant avec la lumière du piston, caractérisé par le fait que le carter est monté à coulissement sur le piston rotatif et est sollicité élastiquement vers le piston tout en étant sensiblement immobilisé en rotation.1. Device for supplying a burner with liquid fuel, comprising a rotary piston pump provided with a light and housed in a sealed manner in a casing itself provided with a suction orifice and a discharge capable of communicating periodically and alternately during the rotation of the piston with the lumen thereof, and a cam mechanism interposed between the housing and the rotary piston, and defining within the housing an activity of variable volume communicating with the light of the piston, characterized in that the casing is slidably mounted on the rotary piston and is resiliently biased towards the piston while being substantially immobilized in rotation. 2. Dispositif selon la revendication 1, comprenant un moteur pour entrainer le piston en rotation, caractérisé par le fait que le piston est constitué par l'arbre moteur, le mécanisme à came étant formé par usinage de l'extrémité de l'arbre.2. Device according to claim 1, comprising a motor for driving the piston in rotation, characterized in that the piston is constituted by the motor shaft, the cam mechanism being formed by machining the end of the shaft. 3. Dispositif s'elon l'une des revendications 1 et 2, caractérisé par le fait que le mécanisme à came comprend une butée réglable associée au carter (au piston) et une surface de came coopérante associée au piston (au carter).3. Device according to one of claims 1 and 2, characterized in that the cam mechanism comprises an adjustable stop associated with the housing (with the piston) and a cooperating cam surface associated with the piston (with the housing). 4. Dispositif selon la revendication 3, caractérisé par le fait que la butée réglable est constituée par une vis ou autre pièce de réglage rapportée au fond borgne du carter et décentrée par rapport à l'axe de rotation du piston.4. Device according to claim 3, characterized in that the adjustable stop is constituted by a screw or other adjustment piece attached to the blind bottom of the casing and offset from the axis of rotation of the piston. 5. Dispositif selon la revendication 4, caractérisé par le fait que la butée réglable décentrée présente Un appui excentré, le mécanisme à came comprenant également la face frontale du piston prévue oblique par rapport à l'axe de rotation dudit piston.5. Device according to claim 4, characterized in that the adjustable offset stop has an eccentric support, the cam mechanism also comprising the front face of the piston provided oblivion than with respect to the axis of rotation of said piston. 6. Dispositif selon l'une des revendications 1 à 5, caractérisé par le fait que le carter mobile de la pompe offre du côté du piston une configuration établie de façon à présenter une extrémité amincie et élastique applicable avec auto-centrage sur le piston.6. Device according to one of claims 1 to 5, characterized in that the movable casing of the pump offers on the side of the piston a configuration established so as to have a thinned and elastic end applicable with self-centering on the piston. 7. Dispositif selon l'une des revendications 1 à 6, comprenant un moteur électrique d'entrai- nement pour la pompe, caractérisé par le fait que le moteur est du type à translation axiale de rotor au démarrage et à l'arrêt, la translation axiale étant supérieure à la course maximale du carter pour permettre un découplage de celui-ci par rapport au piston.7. Device according to one of claims 1 to 6, comprising an electric drive motor for the pump, characterized in that the motor is of the type with axial translation of the rotor at start and stop, the axial translation being greater than the maximum stroke of the casing to allow decoupling of the latter relative to the piston. 8. Dispositif selon l'une des revendications 1 à 7, comprenant un ventilateur d'alimentation en air comburant entrainé par l'arbre du moteur, caractérisé par le fait que le ventilateur produit une translation axiale de l'arbre pour un nombre de tours prédéterminé au moteur.8. Device according to one of claims 1 to 7, comprising a fan for supplying combustion air driven by the motor shaft, characterized in that the fan produces an axial translation of the shaft for a number of revolutions predetermined to the engine. 9. Dispositif selon l'une des revendications 1 à 8, caractérisé par le fait que le carter est sollicité élastiquement vers le piston au moyen d'un faible ressort de rappel.9. Device according to one of claims 1 to 8, characterized in that the casing is urged elastically towards the piston by means of a weak return spring. 10. Dispositif selon la revendication 9 , caractérisé par le fait qu'il comprend une électrovanne d'arrêt disposée sur le conduit de refoulement raccordé à l'orifice de refoulement de la pompe, la fermeture de l'électrovanne entrainant quand le moteur tourne la création dans la cavité de pompe d'une pression provoquant le découplage du carter à partir du piston sous l'effet de la compression du ressort de rappel.10. Device according to claim 9 , characterized in that it comprises a stop solenoid valve disposed on the discharge pipe connected to the discharge port of the pump, the closing of the solenoid valve causing when the engine turns the creation in the pump cavity of a pressure causing the decoupling of the casing from the piston under the effect of the compression of the return spring.
EP80400992A 1980-07-01 1980-07-01 Device for feeding a liquid-fuel burner Expired EP0042900B1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP80400992A EP0042900B1 (en) 1980-07-01 1980-07-01 Device for feeding a liquid-fuel burner
DE8080400992T DE3069285D1 (en) 1980-07-01 1980-07-01 Device for feeding a liquid-fuel burner
AT80400992T ATE9609T1 (en) 1980-07-01 1980-07-01 SUPPLY DEVICE OF A LIQUID FUEL BURNER.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP80400992A EP0042900B1 (en) 1980-07-01 1980-07-01 Device for feeding a liquid-fuel burner

Publications (2)

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EP0042900A1 true EP0042900A1 (en) 1982-01-06
EP0042900B1 EP0042900B1 (en) 1984-09-26

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EP80400992A Expired EP0042900B1 (en) 1980-07-01 1980-07-01 Device for feeding a liquid-fuel burner

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EP (1) EP0042900B1 (en)
AT (1) ATE9609T1 (en)
DE (1) DE3069285D1 (en)

Cited By (3)

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EP0560201A1 (en) * 1992-03-13 1993-09-15 Dolmar GmbH Oilpump, especially for a chain saw
FR2882795A1 (en) * 2005-03-01 2006-09-08 Baxi S A Sa Liquid e.g. domestic fuel oil, pump for e.g. centrifugal atomizing oil burner, has one chamber alternatively in liquid aspiration and repression positions, and another in positions of aspiration and repression of gas, liquid/mixture of both
WO2020018322A1 (en) * 2018-07-20 2020-01-23 Becton, Dickinson And Company Reciprocating pump

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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0560201A1 (en) * 1992-03-13 1993-09-15 Dolmar GmbH Oilpump, especially for a chain saw
US5411382A (en) * 1992-03-13 1995-05-02 Domar Gmbh Oil pump, more particularly for a chain saw
FR2882795A1 (en) * 2005-03-01 2006-09-08 Baxi S A Sa Liquid e.g. domestic fuel oil, pump for e.g. centrifugal atomizing oil burner, has one chamber alternatively in liquid aspiration and repression positions, and another in positions of aspiration and repression of gas, liquid/mixture of both
EP1701035A1 (en) * 2005-03-01 2006-09-13 Baxi S.A. Pump and feeding device
WO2020018322A1 (en) * 2018-07-20 2020-01-23 Becton, Dickinson And Company Reciprocating pump
US20200025184A1 (en) * 2018-07-20 2020-01-23 Becton, Dickinson And Company Reciprocating pump
CN110732057A (en) * 2018-07-20 2020-01-31 贝克顿·迪金森公司 Reciprocating pump
US11174852B2 (en) * 2018-07-20 2021-11-16 Becton, Dickinson And Company Reciprocating pump
JP2021531865A (en) * 2018-07-20 2021-11-25 ベクトン・ディキンソン・アンド・カンパニーBecton, Dickinson And Company Reciprocating pump
US20220034309A1 (en) * 2018-07-20 2022-02-03 Becton, Dickinson And Company Reciprocating pump
CN110732057B (en) * 2018-07-20 2023-03-10 贝克顿·迪金森公司 Reciprocating pump

Also Published As

Publication number Publication date
ATE9609T1 (en) 1984-10-15
EP0042900B1 (en) 1984-09-26
DE3069285D1 (en) 1984-10-31

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