EP0348304B1 - Safety and regulating gas valve - Google Patents

Description

The present invention relates to a safety and regulation device for the supply of gas to a burner of a gas-heated appliance and in particular of a boiler or a water heater, starting at the main arrival. gas and ending at the burner injectors.

GB-A-2 196 732 discloses a safety and regulation device for the gas supply to a burner comprising a box containing at least one safety valve, at least one regulation valve and control circuits for the control of said valves, said housing comprising a shaped element shaped to define at least one gas conduit and support the various valves.

The present invention proposes to provide a device which, while being of a design involving few parts, is of increased reliability by reducing the risks of gas leaks between the main gas inlet and the injectors. a burner.

The characteristics of the device according to the invention are the subject of claim 1.

Subclaims 2 to 5 define advantageous features of the invention.

• la figure 1 est une vue en coupe longitudinale d'un dispositif formant valve gaz multifonctions suivant l'invention ;
• la figure 2 illustre la fonction de sécurité ;
• la figure 3 illustre la fonction de régulation ;
• les figures 4 et 5 illustrent la fonction de distribution, la figure 5 étant une coupe suivant la ligne V-V de la figure 1 ;
• les figures 6 à 10 illustrent un autre exemple de réalisation de l'invention.

The characteristics and advantages of the invention will emerge from the description which follows of an embodiment of a device according to the invention, and with reference to the appended drawings in which:

• Figure 1 is a longitudinal sectional view of a device forming a multifunction gas valve according to the invention;
• Figure 2 illustrates the security function;
• Figure 3 illustrates the regulatory function;
• Figures 4 and 5 illustrate the distribution function, Figure 5 being a section along the line VV of Figure 1;
• Figures 6 to 10 illustrate another embodiment of the invention.

In FIG. 1, the housing consists of a part 4 and a cover 29.

The one-piece part 4 is produced from an aluminum profile cut to length and includes two parallel conduits 5 and 6 partitioned by watertight plugs 9, 10, 11, 12 and 13, in order to obtain the safety chamber 14 , the intermediate chamber 15, the regulation chamber 16 and the distribution chamber 17 (feeder).

The cover 29 has grooves 3 for mounting an electronic card 30 carrying the control circuits for the various valves and carries on its upper face the control panel 36 of the device with, in particular, the operating buttons 31.

The gas arrives through the connector 8 and enters the chamber 14 where the safety valve 7 controlled by the safety valve 20 is located, this valve being in the closed position when the appliance is stopped or in safety and in the open position when the the device is operating normally.

During operation, the gas penetrates, through the orifice 18, into the chamber 15, then, through the orifice 19, into the chamber 16 where the regulating valves 21 and 22 are located, actuated respectively by the valves 23 and 24, these being in the open or closed position depending on demand. When one or both of the valves 21 or 22 is open, the gas enters, through one or the other of the orifices 25 or 26, or through both, in the distribution chamber 17 on which are mounted injectors 27 which will supply the gas to the burners.

FIG. 2 illustrates the safety function which is performed by the safety valve 20, which can be of the solenoid or thermoelectric valve type or any other means making it possible to ensure the safety function and which controls the safety valve 7 which opens or closes orifice 18 allowing gas to pass into the other chambers.

FIG. 3 illustrates the regulating function which is performed by the regulating valves 23 24, which can be of the all-or-nothing or modulating solenoid type or any other means making it possible to carry out the regulating function and which control the valves 21 and 22 which open or close the orifices 25 and 26 allowing the passage of gas in the distribution chamber 17.

Figure 4 illustrates the distribution function performed by the chamber 17 which carries the injectors 27 ensuring the supply of gas to the burners.

FIG. 5 is a section of the profiled part 4 and shows the conduits 5 and 6. At its upper part, two grooves 28 make it possible to receive the cover 29.

It is understood that it is possible, without departing from the invention, to modify construction details or their arrangement with a view to obtaining the same result as appears from the variant illustrated in FIGS. 6 to 10.

The housing 43 of FIG. 6 consists of a housing body 32 and a cover 33, the housing body comprising, at its lower part, a gas duct 34, and at its upper part, two grooves 35 receiving an electronic card 44 carrying the control circuits of the various valves.

To ensure the safety and regulation functions and possibly even distribution with a single duct, use is made of a valve seat carrier 37 of particular shape illustrated by FIGS. 7, 8 and 9, FIG. 7 being an external view of this seat carrier, FIG. 8, a section along line VIII-VIII of FIG. 7 and FIG. 9, a section along IX-IX of FIG. 8.

This valve seat holder is in the form of a hollow cylinder, with a transverse central partition 38 which carries the valve seat itself 39 with its orifice 40, the two cylindrical parts located on either side of the partition 38 comprising two recesses 41 and 42 but diametrically opposite one another.

It is mounted leaktight on the body of the duct which it serves, in this case by gluing, in a bore with a diameter larger than that of the gas duct 34, so that the gas contained in the part of the duct situated side of recess 41 cannot pass into that located on the side of the recess 42 only through the orifice 40 and therefore be isolated from it when the orifice 40 is closed (see FIG. 10).

It is thus possible to have the three safety, regulation and distribution functions on the same single line, regardless of the number of valves used.

Claims (5)

1. Safety and control apparatus for supplying a burner with gas, comprising a manifold including at least one safety valve (20), at least one control valve (23,24) and drive circuits for the control of said valves, said manifold comprising a profiled element (4,32) formed to define at least one gas passage (5,6;34) and to support the various valves, characterized by the fact that said manifold comprises integral means (3,35) for mounting said drive circuits, and that said gas passage or passages are divided by sealed partitions (9-13,37) into chambers with different functions, the passage of gas from one chamber to another being controlled by ports (7,21,22;37) operated respectively by said valves, one of the chambers being a distribution chamber (17) comprising at least one orifice receiving a nozzle (27) for supplying gas to the burner.
2. Apparatus according to claim 1, characterized by the fact that said means (3,35) for mounting the drive circuits are slots formed in opposite walls of the manifold for receiving an electronic circuit board (30,44), upon which said drive circuits are located.
3. Apparatus according to claim 1 or 2, characterized by the fact that the manifold comprises a single profiled element (32) provided with a cover (33).
4. Apparatus according to any one of the preceding claims, characterized by the fact that the profiled element or elements are manufactured by drawing and extrusion.
5. Apparatus according to any one of the preceding claims, characterized by the fact that at least one of said partitions is formed by the valve seat (37) of one of said valves.

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