EP1130268A1 - Circulation pump with double casing - Google Patents

Circulation pump with double casing Download PDF

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Publication number
EP1130268A1
EP1130268A1 EP01400414A EP01400414A EP1130268A1 EP 1130268 A1 EP1130268 A1 EP 1130268A1 EP 01400414 A EP01400414 A EP 01400414A EP 01400414 A EP01400414 A EP 01400414A EP 1130268 A1 EP1130268 A1 EP 1130268A1
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EP
European Patent Office
Prior art keywords
pump
opening
valve
double
pump body
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Granted
Application number
EP01400414A
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German (de)
French (fr)
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EP1130268B1 (en
Inventor
Michel Moire
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Wilo Salmson France SAS
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Pompes Salmson SAS
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Publication of EP1130268A1 publication Critical patent/EP1130268A1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D13/00—Pumping installations or systems
    • F04D13/12—Combinations of two or more pumps
    • F04D13/14—Combinations of two or more pumps the pumps being all of centrifugal type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
    • F04D15/0005—Control, e.g. regulation, of pumps, pumping installations or systems by using valves
    • F04D15/0016—Control, e.g. regulation, of pumps, pumping installations or systems by using valves mixing-reversing- or deviation valves

Definitions

  • the invention relates to pumps, and more specifically, body pumps double used in domestic hot water circuits.
  • FIG. 1 is a schematic sectional representation of such pump ; it has a double pump body 2, with a single inlet 4 and a single outlet 6.
  • the pump body has two bodies 8 and 10, each having a suction port opening at the pump inlet.
  • a rotor 12 or 14 In each body is provided a rotor 12 or 14, each driven in rotation by a motor not shown on the face. Each rotor delivers the fluid sucked in to the pump outlet. the suction port, through a discharge port.
  • a valve 16 at the level of discharge ports of the two bodies close off one of the two discharge ports.
  • Figure 2 shows a domestic hot water distribution system, in which such a double body pump can be used.
  • a hot spring 18 supplies hot water to a distribution circuit 20.
  • the distribution circuit supplies several drawing points 22 - three in the example in the figure.
  • One of problems encountered in such an installation is the cooling of hot water in the distribution circuit, in the absence of drawing, due to heat losses. In this case, the waiting time for drawing water to obtain hot water increases, depending on the distance between the draw-off point and the hot water source.
  • a solution to this problem consists in providing a looping circuit, between the points of drawing and the source of hot water.
  • this loopback circuit includes a loop pipe 24 and a double pump 26. The pump backing up near the entrance to the hot water source 20.
  • the double pump 26 comprises a pump main 28, which ensures the circulation of water under normal operating conditions, and a backup pump 30, which operates only in the event of a pump failure main.
  • the installation therefore has dead arms 32 and 34, which in operation normal of the pump, are not crossed by a current.
  • the arm 32 is crossed by a current when the hot water source is supplied by the network; however, the arm 32 is not crossed by a current in the absence of drawing.
  • the invention provides a double body pump, having an inlet and an outlet, a first pump body with a first suction port opening into the inlet and a first discharge opening opening into the outlet, a second pump body with a second suction opening opening in the inlet and a second discharge opening opening into the outlet, a valve alternately closing the first or the second discharge orifice, characterized by an opening close to the valve between the first and second bodies pump.
  • the opening is made in the valve. In one another embodiment, it is provided in the pump body or in the seat of the valve.
  • the flow in the pump body including the discharge orifice is closed by the valve is between 150 and 250 1 / h at the nominal speed of the pump.
  • a flow rate of around 200 l / h is preferable.
  • the fluid in the pump body including the orifice discharge is closed by the valve is renewed in a period of less than 30 s at nominal pump speed.
  • the invention also provides a domestic hot water distribution installation, having such a pump.
  • the temperature drop between the pump body, the discharge port of which is not blocked by the valve and the pump body, the discharge port of which is closed by the valve is below 5 ° C at nominal pump speed.
  • the invention proposes to provide in a double body pump, a circulation of water through the pump body which is not in operation. This circulation of water prevents stagnation of water, limits the lowering of the temperature, and removes the problem of dead arms.
  • Figure 3 is a schematic sectional representation of a body pump double according to a first embodiment of the invention.
  • the pump is similar to that of Figure 1; however, it has an opening ensuring circulation of water, through the non-functioning pump body.
  • the opening is located in the valve area, or is adjacent to the valve; in other words, this opening is relative to each of the pumps on the discharge side of the pump.
  • the opening connects the pump bodies 8 and 10; its size is calibrated to allow through the pump body not working proper fluid circulation to avoid the stagnation of water.
  • the opening 36 is formed in the valve 16.
  • the circulation of fluid in the double-body pump is symbolized on the figure by arrows.
  • the double arrow at input 4 of the pump symbolizes the flow of suctioned fluid
  • the double arrow at the outlet 6 of the pump symbolizes the flow of fluid returned by the pump.
  • the pump on the left in the figure is in operation.
  • the valve 16 Under the effect of the pressure of the fluid discharged by the rotor 12, the valve 16 is pushed back and closes the discharge opening of the pump body 10.
  • the opening in the valve 16 allows a passage of fluid through the body pump 10, in the opposite direction of the circulation of the fluid during operation.
  • the fluid circulates as symbolized in the figure by the simple arrows, to through the opening 36, the pump body 10, and the suction port of the pump 10.
  • This circulation, or short-circuit of fluid, in the opposite direction avoids any stagnation of the fluid in the pump body which is not used.
  • the valve 16 In the event of a breakdown, when the rotor 14 is started, the valve 16 is repelled by the fluid discharged by the emergency pump, and apply to the orifice delivery of the pump body 8. Similarly, the opening 36 then allows to ensure circulation in the pump body 8, in the opposite direction to the current usual in this pump casing when the pump is operating.
  • the size of the orifice depends on the flow rate of the desired current through the pump which is not used. Typically, an opening can be used which ensures that the flow rate in the inactive pump is between 150 and 250 l / h, preferably close to 200 l / h. The size of the opening can be easily determined depending on what flow and pressure at the outlet of the pump at nominal speed.
  • the pump according to the invention is used for a circulation of hot water
  • such a size of the opening allows that the temperature of water in the emergency pump is close to the temperature of the water in the pump in service.
  • the temperature in the body of the standby pump is around 59.5 ° C when the water temperature is 60 ° C.
  • the temperature drop is thus much less than 5 ° C.
  • a such opening size or flow is sufficient to ensure the renewal of in the body of the emergency pump.
  • the dye disappears from the pumped water after a period of the order of a few seconds.
  • the invention thus avoids any stagnation in the body of the pump. which is not used.
  • a 30 s limit for fluid renewal in the emergency pump is advantageous.
  • the lower limit of the flow rate or of the size of the opening can also be chosen so as to avoid any blockage of the opening, by impurities or mud effects, in particular in hot water distribution installations; the value of 150 1 / h corresponds to a size of approximately 3 mm 2 , and avoids blockages of the opening in normal operation.
  • the upper limit on the size of the opening also prevents the implementation of the invention from affecting the efficiency and performance of the pump in operation. In the example of a pump having the structure of FIG. 3, the drop in efficiency of the pump caused by the opening of the invention is less than 5%.
  • Figure 4 shows a view similar to that of Figure 3, in a second embodiment. Unlike the case of FIG. 3, in this embodiment, the opening 38 is not formed in the valve 16, but in the seat of the valve, or at neighborhood of it.
  • the operation of the pump is exactly the same as operation of the pump described with reference to FIG. 3, and the size of the opening 38 can be identical to that of the opening 36 in FIG. 3.
  • the pump of FIG. 3 or of FIG. 4 advantageously applies in a installation of the type of that of FIG. 2. In such an installation, it makes it possible to remove the dead arms at the level of the circulation circuit pump.
  • the present invention is not limited to the examples and methods of realization described and represented, but it is susceptible of numerous variants accessible to those skilled in the art. We could thus use a different pump structure from that of FIGS. 1, 3 or 4.
  • the invention is described in its preferred application circulation of domestic hot water; in this application, it allows in particular avoid or limit the risks of bacterial proliferation, for example legionellosis. It is clear that the invention applies more generally in all cases where fluid circulation is desirable, and for example, could apply if the pump is used for the circulation of food products.
  • the invention can also be used with aperture sizes different from those mentioned above, depending on the desired flow in the pump backup, or pump performance.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Reciprocating Pumps (AREA)
  • Details Of Reciprocating Pumps (AREA)

Abstract

The dual-chamber pump has an inlet (4) and an outlet (6) with both chambers (8,10) drawing water from the inlet. The main chamber (8) delivers to the outlet and through a hole in the valve (36) that normally blocks the outlet of the second chamber. If the first chamber fails the valve is opened and water circulated by the second chamber.

Description

L'invention concerne les pompes, et plus précisément, les pompes à corps double utilisées dans les circuits d'eau chaude sanitaire.The invention relates to pumps, and more specifically, body pumps double used in domestic hot water circuits.

La demanderesse commercialise dans la gamme CXL des pompes à corps double. Des telles pompes sont recommandées pour la circulation de l'eau chaude ou glacée dans les circuits de chauffage ou de climatisation ; elles permettent une sécurité accrue, une des deux pompes servant de pompe de secours en cas de panne de l'autre pompe. La figure 1 est une représentation schématique en coupe d'une telle pompe ; elle présente un corps de pompe 2 double, avec une entrée unique 4 et une sortie unique 6. Le corps de pompe présente deux corps 8 et 10, ayant chacun un orifice d'aspiration débouchant au niveau de l'entrée de la pompe. Dans chaque corps est prévu un rotor 12 ou 14, entraíné chacun en rotation par un moteur non représenté sur la figure. Chaque rotor refoule vers la sortie de la pompe le fluide aspiré par l'orifice d'aspiration, à travers un orifice de refoulement. Un clapet 16 au niveau des orifices de refoulement des deux corps obture un des deux orifices de refoulement. Le fonctionnement d'une telle pompe est le suivant. A tout moment, seul un des deux moteurs est en fonctionnement, de telle sorte qu'un seul des deux rotors est entraíné en rotation. Sous l'effet du fluide refoulé par le rotor en rotation, le clapet 16 obture l'orifice de refoulement de l'autre corps. Le clapet 16 assure que le fluide refoulé par une pompe est effectivement refoulé vers l'orifice de sorte du corps double, et ne circule pas à travers l'autre pompe.The applicant markets body pumps in the CXL range double. Such pumps are recommended for circulation of hot water or ice in the heating or air conditioning circuits; they allow security one of the two pumps serving as a backup pump in the event of the other pump. Figure 1 is a schematic sectional representation of such pump ; it has a double pump body 2, with a single inlet 4 and a single outlet 6. The pump body has two bodies 8 and 10, each having a suction port opening at the pump inlet. In each body is provided a rotor 12 or 14, each driven in rotation by a motor not shown on the face. Each rotor delivers the fluid sucked in to the pump outlet. the suction port, through a discharge port. A valve 16 at the level of discharge ports of the two bodies close off one of the two discharge ports. The operation of such a pump is as follows. At any time, only one of the two motors are running, so that only one of the two rotors is driven in rotation. Under the effect of the fluid discharged by the rotating rotor, the valve 16 closes the discharge port of the other body. The valve 16 ensures that the fluid discharged by a pump is effectively pumped towards the orifice so the double body, and does not not flow through the other pump.

La figure 2 montre une installation de distribution d'eau chaude sanitaire, dans laquelle une telle pompe à corps double peut être utilisée. Une source d'eau chaude 18 fournit vers un circuit de distribution 20 de l'eau chaude. Le circuit de distribution alimente plusieurs points de puisage 22 ― trois dans l'exemple de la figure. Un des problèmes rencontrés dans une telle installation est le refroidissement de l'eau chaude dans le circuit de distribution, en absence de puisage, du fait des pertes calorifiques. Dans ce cas, le temps d'attente au puisage pour obtenir de l'eau chaude augmente, en fonction de la distance entre le point de puisage et la source d'eau chaude. Une solution à ce problème consiste à prévoir un circuit de bouclage, entre les points de puisage et la source d'eau chaude. Dans l'exemple de la figure, ce circuit de bouclage comprend une canalisation de bouclage 24 et une pompe double 26. La pompe refoule au voisinage de l'entrée de la source d'eau chaude 20. Un tel circuit de bouclage permet de maintenir une circulation d'eau chaude dans l'installation, même en dehors de tout puisage, et réduit le temps d'attente au puisage d'eau. Classiquement, comme dans l'exemple de la figure, la pompe double 26 comprend une pompe principale 28, qui assure la circulation de l'eau en régime normal de fonctionnement, et une pompe de secours 30, qui ne fonctionne qu'en cas de panne de la pompe principale. L'installation présente de ce fait des bras morts 32 et 34, qui en fonctionnement normal de la pompe, ne sont pas traversés par un courant. Dans l'exemple, le bras 32 est traversé par un courant lorsque la source d'eau chaude est alimentée par le réseau ; toutefois, le bras 32 n'est pas traversé par un courant en l'absence de puisage.Figure 2 shows a domestic hot water distribution system, in which such a double body pump can be used. A hot spring 18 supplies hot water to a distribution circuit 20. The distribution circuit supplies several drawing points 22 - three in the example in the figure. One of problems encountered in such an installation is the cooling of hot water in the distribution circuit, in the absence of drawing, due to heat losses. In this case, the waiting time for drawing water to obtain hot water increases, depending on the distance between the draw-off point and the hot water source. A solution to this problem consists in providing a looping circuit, between the points of drawing and the source of hot water. In the example in the figure, this loopback circuit includes a loop pipe 24 and a double pump 26. The pump backing up near the entrance to the hot water source 20. Such a circuit circulation keeps hot water circulation in the installation, even outside of any drawing, and reduces the waiting time for drawing water. Classically, as in the example in the figure, the double pump 26 comprises a pump main 28, which ensures the circulation of water under normal operating conditions, and a backup pump 30, which operates only in the event of a pump failure main. The installation therefore has dead arms 32 and 34, which in operation normal of the pump, are not crossed by a current. In the example, the arm 32 is crossed by a current when the hot water source is supplied by the network; however, the arm 32 is not crossed by a current in the absence of drawing.

Il est par ailleurs recommandé, notamment dans les installations d'eau chaude, de limiter autant que possible le volume des bras morts et des points de stagnation. Le guide technique n°1 concernant la protection des réseau de distribution d'eau destinée à la consommation humaine (DT27), édité par la Direction générale de la Santé du Ministère chargé de la Santé, suggère d'éviter les zones mortes, les changements brusques de direction, les inversions du sens de circulation de l'eau dans le cas de bouclage. Health and Security Executive, The control of Legionellosis including legionnaire's disease, suggère pour éviter la prolifération de legionella dans les installations de distribution d'eau chaude sanitaire, de limiter les bras morts. De fait, les bactéries provoquant la légionellose se développent particulièrement à une température de l'ordre de 35°C, qui est atteinte dans les bras morts du fait de l'abaissement de la température.It is also recommended, especially in hot water installations, limit as much as possible the volume of dead arms and stagnation points. Technical guide n ° 1 concerning the protection of water distribution networks intended for human consumption (DT27), published by the Directorate General of Health of the Ministry of Health, suggests avoiding dead zones, sudden changes of direction, reversals of the direction of water circulation in the event of a loopback. Health and Security Executive, The control of Legionellosis including legionnaire's disease, suggests to avoid the proliferation of legionella in domestic hot water distribution systems, limit dead arms. Of fact, the bacteria causing legionellosis grow particularly at a temperature of around 35 ° C, which is reached in the dead arms due to the lowering of the temperature.

L'utilisation de pompes à corps double permet d'éviter les bras morts, dans la mesure où une seule tuyauterie est nécessaire pour connecter la pompe. Toutefois, il peut subsister une zone d'eau stagnante dans la partie du corps de pompe où le rotor ne tourne pas. Ce problème de stagnation des eaux dans un des corps d'une pompe à corps double n'est pas décrit dans l'état de la technique pour les pompes à corps double. L'invention vise à résoudre ce problème nouveau. Elle propose une solution qui est simple de mise en oeuvre, qui préserve le rendement de la pompe, et qui ne nécessite aucune intervention.The use of double body pumps avoids dead arms, in the since only one pipe is needed to connect the pump. However, it a zone of stagnant water may remain in the part of the pump body where the rotor don't spin. This problem of stagnation of water in one of the bodies of a pump double body is not described in the prior art for body pumps double. The invention aims to solve this new problem. She offers a solution which is simple to implement, which preserves the efficiency of the pump, and which does not requires no intervention.

Plus précisément, l'invention propose une pompe à corps double, présentant une entrée et une sortie, un premier corps de pompe avec un premier orifice d'aspiration débouchant dans l'entrée et un premier orifice de refoulement débouchant dans la sortie, un deuxième corps de pompe avec un deuxième orifice d'aspiration débouchant dans l'entrée et un deuxième orifice de refoulement débouchant dans la sortie, un clapet obturant alternativement le premier ou le deuxième orifice de refoulement, caractérisé par une ouverture voisine du clapet entre les premier et deuxième corps de pompe.More specifically, the invention provides a double body pump, having an inlet and an outlet, a first pump body with a first suction port opening into the inlet and a first discharge opening opening into the outlet, a second pump body with a second suction opening opening in the inlet and a second discharge opening opening into the outlet, a valve alternately closing the first or the second discharge orifice, characterized by an opening close to the valve between the first and second bodies pump.

Dans un mode de réalisation, l'ouverture est ménagée dans le clapet. Dans un autre mode de réalisation, elle est ménagée dans le corps de pompe ou dans le siège du clapet.In one embodiment, the opening is made in the valve. In one another embodiment, it is provided in the pump body or in the seat of the valve.

Avantageusement, le débit dans le corps de pompe dont l'orifice de refoulement est obturé par le clapet est compris entre 150 et 250 1/h au régime nominal de la pompe. Un débit d'environ 200 1/h est préférable.Advantageously, the flow in the pump body including the discharge orifice is closed by the valve is between 150 and 250 1 / h at the nominal speed of the pump. A flow rate of around 200 l / h is preferable.

Dans un mode de réalisation, le fluide dans le corps de pompe dont l'orifice de refoulement est obturé par le clapet est renouvelé en une durée inférieure à 30 s au régime nominal de la pompe.In one embodiment, the fluid in the pump body including the orifice discharge is closed by the valve is renewed in a period of less than 30 s at nominal pump speed.

L'invention propose aussi une installation de distribution d'eau chaude sanitaire, présentant une telle pompe. Dans un mode de réalisation la chute de température entre le corps de pompe dont l'orifice de refoulement n'est pas obturé par le clapet et le corps de pompe dont l'orifice de refoulement est obturé par le clapet est inférieure à 5°C au régime nominal de la pompe.The invention also provides a domestic hot water distribution installation, having such a pump. In one embodiment the temperature drop between the pump body, the discharge port of which is not blocked by the valve and the pump body, the discharge port of which is closed by the valve is below 5 ° C at nominal pump speed.

D'autres caractéristiques et avantages de l'invention apparaítront à la lecture de la description qui suit de modes de réalisation de l'invention, donnée à titre d'exemple et en référence aux dessins annexés qui montrent :

  • figure 1 une représentation schématique en coupe d'une pompe à corps double connue ;
  • figure 2 une représentation schématique d'une installation de distribution d'eau chaude sanitaire avec circulation ;
  • figure 3 une représentation schématique en coupe d'une pompe à corps double selon une premier mode de réalisation de l'invention ;
  • figure 4 une représentation schématique en coupe d'une pompe à corps double selon un deuxième mode de réalisation de l'invention.
Other characteristics and advantages of the invention will appear on reading the following description of embodiments of the invention, given by way of example and with reference to the appended drawings which show:
  • Figure 1 a schematic sectional representation of a known double body pump;
  • Figure 2 a schematic representation of a domestic hot water distribution system with circulation;
  • Figure 3 a schematic sectional representation of a double body pump according to a first embodiment of the invention;
  • Figure 4 a schematic sectional representation of a double body pump according to a second embodiment of the invention.

L'invention propose de prévoir dans une pompe à corps double, une circulation d'eau à travers le corps de la pompe qui n'est pas en fonctionnement. Cette circulation d'eau évite la stagnation d'eau, limite l'abaissement de la température, et supprime le problème des bras morts.The invention proposes to provide in a double body pump, a circulation of water through the pump body which is not in operation. This circulation of water prevents stagnation of water, limits the lowering of the temperature, and removes the problem of dead arms.

La figure 3 est une représentation schématique en coupe d'une pompe à corps double selon un premier mode de réalisation de l'invention. La pompe est similaire à celle de la figure 1; elle présente toutefois une ouverture assurant une circulation d'eau, à travers le corps de pompe qui ne fonctionne pas. L'ouverture est située dans la zone du clapet, ou est voisine du clapet ; autrement dit, cette ouverture se trouve par rapport à chacune des pompes du côté de refoulement de la pompe. L'ouverture relie les corps de pompe 8 et 10; sa taille est calibrée pour permettre à travers le corps de la pompe qui ne fonctionne pas une circulation de fluide propre à éviter la stagnation d'eau.Figure 3 is a schematic sectional representation of a body pump double according to a first embodiment of the invention. The pump is similar to that of Figure 1; however, it has an opening ensuring circulation of water, through the non-functioning pump body. The opening is located in the valve area, or is adjacent to the valve; in other words, this opening is relative to each of the pumps on the discharge side of the pump. The opening connects the pump bodies 8 and 10; its size is calibrated to allow through the pump body not working proper fluid circulation to avoid the stagnation of water.

Dans le mode de réalisation de la figure 3, l'ouverture 36 est ménagée dans le clapet 16. La circulation de fluide dans la pompe à corps double est symbolisée sur la figure par des flèches. La flèche double au niveau de l'entrée 4 de la pompe symbolise le flux de fluide aspiré, et la flèche double au niveau de la sortie 6 de la pompe symbolise le flux de fluide refoulé par la pompe. La pompe de gauche sur la figure est en fonctionnement. Sous l'effet de la pression du fluide refoulé par le rotor 12, le clapet 16 est repoussé et obture l'orifice de refoulement du corps de pompe 10. L'ouverture ménagée dans le clapet 16 permet un passage de fluide à travers le corps de pompe 10, dans le sens contraire de la circulation du fluide en cas de fonctionnement. Le fluide circule comme symbolisé sur la figure par les flèches simples, à travers l'ouverture 36, le corps de pompe 10, et l'orifice d'aspiration du corps de pompe 10. Cette circulation, ou court-circuit de fluide, à contre sens permet d'éviter toute stagnation du fluide dans le corps de pompe qui n'est pas utilisé.In the embodiment of Figure 3, the opening 36 is formed in the valve 16. The circulation of fluid in the double-body pump is symbolized on the figure by arrows. The double arrow at input 4 of the pump symbolizes the flow of suctioned fluid, and the double arrow at the outlet 6 of the pump symbolizes the flow of fluid returned by the pump. The pump on the left in the figure is in operation. Under the effect of the pressure of the fluid discharged by the rotor 12, the valve 16 is pushed back and closes the discharge opening of the pump body 10. The opening in the valve 16 allows a passage of fluid through the body pump 10, in the opposite direction of the circulation of the fluid during operation. The fluid circulates as symbolized in the figure by the simple arrows, to through the opening 36, the pump body 10, and the suction port of the pump 10. This circulation, or short-circuit of fluid, in the opposite direction avoids any stagnation of the fluid in the pump body which is not used.

En cas de panne, lors de la mise en marche du rotor 14, le clapet 16 est repoussé par le fluide refoulé par la pompe de secours, et s'appliquer sur l'orifice de refoulement du corps de pompe 8. De la même façon, l'ouverture 36 permet alors d'assurer une circulation dans le corps de pompe 8, dans le sens inverse du courant habituel dans ce corps de pompe en cas de fonctionnement de la pompe.In the event of a breakdown, when the rotor 14 is started, the valve 16 is repelled by the fluid discharged by the emergency pump, and apply to the orifice delivery of the pump body 8. Similarly, the opening 36 then allows to ensure circulation in the pump body 8, in the opposite direction to the current usual in this pump casing when the pump is operating.

La taille de l'orifice dépend du débit du courant souhaité à travers la pompe qui n'est pas utilisée. Typiquement, on peut utiliser une ouverture qui est assure que le débit dans la pompe inactive est compris entre 150 et 250 l/h, de préférence voisin de 200 l/h. La taille de l'ouverture peut être déterminée facilement en fonction de ce débit et de la pression en sortie de la pompe en régime nominal.The size of the orifice depends on the flow rate of the desired current through the pump which is not used. Typically, an opening can be used which ensures that the flow rate in the inactive pump is between 150 and 250 l / h, preferably close to 200 l / h. The size of the opening can be easily determined depending on what flow and pressure at the outlet of the pump at nominal speed.

Le courant est alors suffisant pour éviter la stagnation de fluide et garantir le renouvellement de fluide. Dans le cas où la pompe selon l'invention est utilisée pour une circulation d'eau chaude, une telle taille de l'ouverture permet que la température de l'eau dans la pompe de secours soit voisine de la température de l'eau dans la pompe en service. Dans une pompe présentant la structure générale de la figure 3, pour un débit de 200 l/h dans la pompe de secours, la température dans le corps de la pompe de secours est de l'ordre de 59,5°C, lorsque la température de l'eau est de 60°C. La chute de température est ainsi largement inférieure à 5°C. Par ailleurs, une telle taille d'ouverture ou un tel débit est suffisant pour assurer le renouvellement de dans le corps de la pompe de secours. Si le corps de pompe de secours est rempli d'eau colorée, le colorant disparaít de l'eau refoulée après une durée de l'ordre de quelques secondes. L'invention évite ainsi toute stagnation dans le corps de la pompe qui n'est pas utilisé. Une limite de 30 s pour le renouvellement du fluide dans la pompe de secours est avantageuse.The current is then sufficient to avoid stagnation of fluid and guarantee the fluid renewal. In the case where the pump according to the invention is used for a circulation of hot water, such a size of the opening allows that the temperature of water in the emergency pump is close to the temperature of the water in the pump in service. In a pump presenting the general structure of FIG. 3, for a flow rate of 200 l / h in the emergency pump, the temperature in the body of the standby pump is around 59.5 ° C when the water temperature is 60 ° C. The temperature drop is thus much less than 5 ° C. In addition, a such opening size or flow is sufficient to ensure the renewal of in the body of the emergency pump. If the emergency pump body is filled of colored water, the dye disappears from the pumped water after a period of the order of a few seconds. The invention thus avoids any stagnation in the body of the pump. which is not used. A 30 s limit for fluid renewal in the emergency pump is advantageous.

La limite inférieure du débit ou de la taille de l'ouverture peut aussi être choisie de sorte à éviter toute obturation de l'ouverture, par des impuretés ou des effets de boue, notamment dans les installations de distribution d'eau chaude ; la valeur de 150 1/h correspond à une taille d'environ 3 mm2, et évite les obturations de l'ouverture en fonctionnement normal. La limite supérieure à la taille de l'ouverture évite par ailleurs que la mise en oeuvre de l'invention n'affecte le rendement et les performances de la pompe en fonctionnement. Dans l'exemple d'une pompe présentant la structure de la figure 3, la baisse de rendement de la pompe provoquée par l'ouverture de l'invention est inférieure à 5%.The lower limit of the flow rate or of the size of the opening can also be chosen so as to avoid any blockage of the opening, by impurities or mud effects, in particular in hot water distribution installations; the value of 150 1 / h corresponds to a size of approximately 3 mm 2 , and avoids blockages of the opening in normal operation. The upper limit on the size of the opening also prevents the implementation of the invention from affecting the efficiency and performance of the pump in operation. In the example of a pump having the structure of FIG. 3, the drop in efficiency of the pump caused by the opening of the invention is less than 5%.

La figure 4 montre une vue similaire à celle de la figure 3, dans un deuxième mode de réalisation. A l'inverse du cas de la figure 3, dans ce mode de réalisation, l'ouverture 38 n'est pas ménagée dans le clapet 16, mais dans le siège du clapet, ou au voisinage de celui-ci. Le fonctionnement de la pompe est exactement similaire au fonctionnement de la pompe décrite en référence à la figure 3, et la taille de l'ouverture 38 peut identique à celle de l'ouverture 36 de la figure 3.Figure 4 shows a view similar to that of Figure 3, in a second embodiment. Unlike the case of FIG. 3, in this embodiment, the opening 38 is not formed in the valve 16, but in the seat of the valve, or at neighborhood of it. The operation of the pump is exactly the same as operation of the pump described with reference to FIG. 3, and the size of the opening 38 can be identical to that of the opening 36 in FIG. 3.

Le mode de réalisation de la figure 3 présente par rapport au mode de réalisation de la figure 4 l'avantage de ne pas nécessiter de modification du corps de pompe. Il permet d'utiliser le même corps de pompe double pour des pompes mettant en oeuvre l'invention, et pour des pompes qui ne l'utilisent pas. A l'inverse, le mode de réalisation de la figure 4 permet d'utiliser les mêmes types de clapets pour des pompes mettant en oeuvre l'invention, et pour des pompes qui ne l'utilisent pas.The embodiment of Figure 3 presents with respect to the embodiment in Figure 4 the advantage of not requiring modification of the pump body. It allows the same double pump body to be used for pumps works the invention, and for pumps which do not use it. Conversely, the mode of embodiment of FIG. 4 allows the same types of valves to be used for pumps implementing the invention, and for pumps which do not use it.

La pompe de la figure 3 ou de la figure 4 s'applique avantageusement dans une installation du type de celle de la figure 2. Dans une telle installation, elle permet de supprimer les bras morts au niveau de la pompe du circuit de bouclage.The pump of FIG. 3 or of FIG. 4 advantageously applies in a installation of the type of that of FIG. 2. In such an installation, it makes it possible to remove the dead arms at the level of the circulation circuit pump.

Bien entendu, la présente invention n'est pas limitée aux exemples et modes de réalisation décrits et représentés, mais elle est susceptible de nombreuses variantes accessibles à l'homme de l'art. On pourrait ainsi utiliser une structure de pompe différente de celle des figures 1, 3 ou 4. L'invention est décrite dans son application préférée à la circulation d'eau chaude sanitaire ; dans cette application, elle permet notamment d'éviter ou de limiter les risques de prolifération bactérienne, par exemple de légionellose. Il est clair que l'invention s'applique plus généralement dans tous les cas où une circulation de fluide est souhaitable, et par exemple, pourrait s'appliquer si la pompe est utilisée pour la circulation de produits alimentaires.Of course, the present invention is not limited to the examples and methods of realization described and represented, but it is susceptible of numerous variants accessible to those skilled in the art. We could thus use a different pump structure from that of FIGS. 1, 3 or 4. The invention is described in its preferred application circulation of domestic hot water; in this application, it allows in particular avoid or limit the risks of bacterial proliferation, for example legionellosis. It is clear that the invention applies more generally in all cases where fluid circulation is desirable, and for example, could apply if the pump is used for the circulation of food products.

On peut aussi utiliser l'invention avec des tailles d'ouverture différentes de celles qui sont mentionnées plus haut, en fonction du débit recherché dans la pompe de secours, ou du rendement de la pompe.The invention can also be used with aperture sizes different from those mentioned above, depending on the desired flow in the pump backup, or pump performance.

Claims (8)

Une pompe à corps double (2), présentant une entrée (4) et une sortie (6), un premier corps de pompe (8) avec un premier orifice d'aspiration débouchant dans l'entrée et un premier orifice de refoulement débouchant dans la sortie, un deuxième corps de pompe (10) avec un deuxième orifice d'aspiration débouchant dans l'entrée et un deuxième orifice de refoulement débouchant dans la sortie, un clapet obturant alternativement le premier ou le deuxième orifice de refoulement, caractérisé par une ouverture (36, 38) voisine du clapet entre les premier et deuxième corps de pompe.A double body pump (2), having an inlet (4) and an outlet (6), a first pump body (8) with a first suction opening opening in the inlet and a first discharge orifice opening into the outlet, a second pump body (10) with a second suction opening opening in the inlet and a second discharge opening opening into the outlet, a valve alternately closing the first or the second discharge orifice, characterized by an opening (36, 38) adjacent to the valve between the first and second pump body. La pompe de la revendication 1, caractérisée en ce que l'ouverture (36) est ménagée dans le clapet.The pump of claim 1, characterized in that the opening (36) is formed in the valve. La pompe de la revendication 1, caractérisée en ce que l'ouverture (38) est ménagée dans le corps de pompe.The pump of claim 1, characterized in that the opening (38) is formed in the pump body. La pompe de l'une des revendications 1 à 3, caractérisée en ce que le débit dans le corps de pompe dont l'orifice de refoulement est obturé par le clapet est compris entre 150 et 250 l/h au régime nominal de la pompe.The pump of one of claims 1 to 3, characterized in that the flow rate in the pump body, the discharge orifice of which is closed by the valve, is between 150 and 250 l / h at the nominal speed of the pump. La pompe de la revendication 4, caractérisée en ce que le dit débit est d'environ 200l/h.The pump of claim 4, characterized in that said flow is around 200l / h. La pompe de l'une des revendication 1 à 5, caractérisée en ce que le fluide dans le corps de pompe dont l'orifice de refoulement est obturé par le clapet est renouvelé en une durée inférieure à 30 s au régime nominal de la pompe.The pump of one of claims 1 to 5, characterized in that the fluid in the pump body whose discharge orifice is closed by the valve is renewed in a period of less than 30 s at the nominal speed of the pump. Une installation de distribution d'eau chaude sanitaire, comprenant une pompe selon l'une des revendications 1 à 6.A domestic hot water distribution system, including a pump according to one of claims 1 to 6. L'installation selon la revendication 7, caractérisée en ce que la chute de température entre le corps de pompe dont l'orifice de refoulement n'est pas obturé par le clapet et le corps de pompe dont l'orifice de refoulement est obturé par le clapet est inférieure à 5°C au régime nominal de la pompe.The installation according to claim 7, characterized in that the temperature drop between the pump body, the discharge port of which is not closed by the valve and the pump body, the discharge port of which is closed by the valve is less than 5 ° C at nominal pump speed.
EP20010400414 2000-02-22 2001-02-16 Circulation pump with double casing Expired - Lifetime EP1130268B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0002167A FR2805315B1 (en) 2000-02-22 2000-02-22 DUAL CIRCULATION BODY PUMP
FR0002167 2000-02-22

Publications (2)

Publication Number Publication Date
EP1130268A1 true EP1130268A1 (en) 2001-09-05
EP1130268B1 EP1130268B1 (en) 2006-05-17

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EP20010400414 Expired - Lifetime EP1130268B1 (en) 2000-02-22 2001-02-16 Circulation pump with double casing

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EP (1) EP1130268B1 (en)
DE (1) DE60119605T2 (en)
FR (1) FR2805315B1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100404873C (en) * 2005-07-07 2008-07-23 上海东方泵业(集团)有限公司 Parallel series pump

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011116957A1 (en) * 2011-10-26 2013-05-02 Vaillant Gmbh Multiple coaxial pump

Citations (3)

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Publication number Priority date Publication date Assignee Title
DE1528649A1 (en) * 1966-07-21 1969-05-29 Flygts Pumpar Ab Pump unit, consisting of two centrifugal pumps
FR2105733A5 (en) * 1970-09-18 1972-04-28 Materiel Telephonique
FR2352184A1 (en) * 1976-05-20 1977-12-16 Loewe Pumpenfabrik Gmbh Twin pumps with changeover flap valves - have devices restricting amount for which valves can open

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1528649A1 (en) * 1966-07-21 1969-05-29 Flygts Pumpar Ab Pump unit, consisting of two centrifugal pumps
FR2105733A5 (en) * 1970-09-18 1972-04-28 Materiel Telephonique
FR2352184A1 (en) * 1976-05-20 1977-12-16 Loewe Pumpenfabrik Gmbh Twin pumps with changeover flap valves - have devices restricting amount for which valves can open

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100404873C (en) * 2005-07-07 2008-07-23 上海东方泵业(集团)有限公司 Parallel series pump

Also Published As

Publication number Publication date
DE60119605D1 (en) 2006-06-22
EP1130268B1 (en) 2006-05-17
DE60119605T2 (en) 2007-04-26
FR2805315A1 (en) 2001-08-24
FR2805315B1 (en) 2002-05-31

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