JP4104005B2 - Gas supply device - Google Patents

Description

  The present invention relates to a gas supply device that supplies gas to a gas burner provided in a hot water supply device or the like.

  The gas burner needs to be supplied by ejecting gas from a nozzle. Accordingly, a nozzle is provided in a nozzle chamber having a certain volume, and gas is supplied to the nozzle chamber via a manifold (gas passage). The manifold is provided with a gas passage opening that is opened and closed by an on-off valve. When the on-off valve is opened, the gas in the primary chamber flows out to the manifold through the gas passage opening and passes through the manifold to the nozzle chamber. Reach.

A nozzle chamber, a manifold, and a primary chamber that are integrally formed by aluminum die casting are known (see Patent Document 1).
Japanese Patent Laid-Open No. 8-86416 (FIG. 3)

  Since the conventional gas supply device is molded by aluminum die casting, the weight is increased due to the wall thickness. For example, when the gas supply device is incorporated in a gas hot water supply device, the strength of the mounting portion must be increased. In particular, when the gas supply device is increased in size, not only the weight increases drastically, but also the casting device must be used in a large size, which increases the cost. In addition, the yield of cast products is not high due to defects such as the cast hole, but when the valve seat surface is machined and the cast surface is scraped to use the gas passage port as the valve port, a new cast hole appears from the inside. And the yield is further reduced.

  In view of the above-described problems, an object of the present invention is to provide a gas supply device that is lightweight without using casting such as aluminum die casting and has a lower cost than the conventional one.

In order to solve the above problems, a gas supply apparatus according to the present invention includes a nozzle chamber provided with a nozzle for ejecting gas to a gas burner, a gas passage port of a primary chamber to which gas is supplied from a gas supply pipe, and a nozzle chamber. In a gas supply device having a manifold portion communicating with each other and an on-off valve attached to the primary chamber for opening and closing the gas passage port of the primary chamber, two metal plates having substantially the same outer shape with one sheet metal processing by forming the one primary chamber and nozzle, and the other to form a nozzle chamber communicating with each manifold portion and a plurality of the manifold portion, in close contact with the opening portion of the primary chamber wherein the opening to be the gas passage openings are combined one of two said sides of the partition plate plate having a plurality formed corresponding to the respective manifold portions airtight.

  According to the above configuration, it is possible to integrally form the nozzle to the primary chamber by a sheet metal processed product, not by casting such as aluminum die casting. This can reduce the weight of the gas supply device. Further, the gas passage port provided in the partition plate has a stable sealing performance and a good yield.

  A boss part that protrudes outward from the wall surface of the primary chamber is formed by pressing a boss, and the boss part is press-fitted into an attachment hole formed in the on-off valve or inserted into the attachment hole. If the on-off valve is attached to the primary chamber by caulking, the through-hole for attaching the on-off valve may not be provided in the primary chamber, and the airtightness is not impaired by the attachment of the on-off valve.

  In addition, the holder member holds the on-off valve, and the holder member is formed with a mounting leg, and the leg is fixed at a position near the primary chamber where no manifold is formed. Even if the on-off valve is attached to the primary chamber, the on-off valve can be attached to the primary chamber without impairing airtightness.

  In the state where the partition plate is fitted to the peripheral edge of the primary chamber, and the partition plate is fitted into the step portion, the mating surface of the plate material on which the primary chamber is formed and the surface of the partition plate are flush with each other. If it comprises, the sheet-like sealing member pinched | interposed when match | combining two board | plate materials can use a flat thing instead of a complicated shape, and also reduction of cost is achieved.

  If the partition plate is made of resin, not only the airtightness between the stepped portion and the partition plate is improved, but also the surface roughness of the valve seat surface portion of the gas passage port that functions as the valve port of the on-off valve is improved. Can be sealed.

  As is apparent from the above description, the present invention can form the entire gas supply device with a plate material such as a sheet metal, so that not only the manufacturing cost can be reduced but also the weight can be reduced.

  Referring to FIG. 1, reference numeral 1 denotes a hot water supply apparatus to which a gas supply device according to the present invention is applied, and includes a hot water supply combustion cylinder 11 and a reheating combustion cylinder 12. The combustion cylinder 11 supplies tap water as hot water at a predetermined temperature to hot water in various places inside the kitchen and hot water for filling the bathtub in the bathroom. On the other hand, the combustion cylinder 12 performs reheating to circulate and heat the hot water in the bathtub.

  Each of the combustion cylinders 11 and 12 is provided with a burner unit 13. This burner unit 13 is a unitary assembly in which a plurality of gas burners are arranged. The combustion cylinder 11 is provided with three large and small burner units 13 to expand the adjustment range of the hot water supply capacity, and the combustion cylinder 12 is provided with one burner unit 13 for a total of four burner units 13. It is installed.

  A nozzle chamber 2 is provided corresponding to each burner unit 13. Nozzles are provided in the nozzle chamber 2, and gas is ejected from each nozzle to each gas burner constituting the burner unit 13.

  Gas is supplied to these nozzle chambers 2 through a manifold portion 3. A gas passage port 41 faces each of the manifold portions 3. The gas passage port 41 opens toward the primary chamber, and the gas in the primary chamber flows out from the gas passage port 41 to the manifold portion 3. Gas is supplied to the primary chamber 4 via the connecting pipe 6. The connecting pipe 6 is provided with a proportional control valve 61 and a safety valve 62.

  The primary chamber 4 is provided with an opening / closing valve 5 corresponding to each gas passage port 41. Therefore, gas is supplied only to the burner unit 13 of the opened system among these four on-off valves 5. By switching the open / close state of the on-off valve 5 in this way, the amount of combustion in the combustion cylinder 11 can be adjusted in a wide range.

  2 to 4, in practice, a plurality of nozzles 21 and a first plate member 7a in which the primary chamber 4 is formed by sheet metal processing, each nozzle chamber 2 communicating with the nozzle 21, and the nozzles. A structure in which the manifold portion 3 communicating with the chamber 2 is combined with the second plate material 7b formed by sheet metal processing is employed. A partition plate 7c that is in close contact with the opening portion on the mating surface side of the primary chamber is sandwiched between the plate members 7a and 7b. The partition plate 7c may be formed of sheet metal, but is made of resin in the present embodiment.

  In the opening portion of the primary chamber, a step portion 71 is formed over the entire circumference by half-punching, and the partition plate 7c is set so as to fit into the step portion 71. The depth of the stepped portion 71 is set to be the same size as the thickness of the partition plate 7c. When the partition plate 7c is fitted into the stepped portion 71, the mating surface of the first plate member 7a and the partition plate 7c There is no step between the surface and both surfaces are flush. Therefore, the sheet-like sealing member 7d sandwiched between the two plate members 7a and 7b does not need to be formed stepwise, and the sheet-like material is simply punched into a predetermined shape.

  A gas passage port 41 is formed in the partition plate 7c so as to oppose each manifold portion 3, and these gas passage ports 41 are opened and closed by an opening / closing valve 5 attached to a wall surface constituting the primary chamber. The on-off valve 5 is provided with rectangular flanges 51, and attachment holes 52, which are through holes for attachment, are formed at the four corners of the flanges 51. On the other hand, a boss portion 42 protruding outward is provided on the wall surface constituting the primary chamber 4. And when attaching the on-off valve 5 to a primary chamber, the boss | hub part 42 is inserted in the attachment hole 52, and positioning of the on-off valve 5 is performed.

  Although the boss portion 42 may be press-fitted into the mounting hole 52, in this embodiment, the boss portion 42 is caulked after insertion so that the on-off valve 5 does not fall out of the primary chamber 4. Referring to FIG. 5, the boss portion 42 is formed by a boss ejection process by a press process. First, a boss portion 42 having a small cross-sectional area but a large cross-sectional area is formed by half punching. And the boss | hub part 42 was pressed from the perimeter direction, it was made thin in the desired diameter, and the protrusion amount was made high. With the boss portion 42 inserted into the mounting hole 52, the head of the boss portion 42 is deformed and caulked so that the flange 51 does not fall out of the primary chamber 4. Since the flange 51 is in close contact with the primary chamber 4 during this caulking, the annular seal member 53 is appropriately compressed and deformed to ensure airtightness between the primary chamber 4 and the on-off valve 5.

  By the way, the connecting pipe 6 is connected to an opening 60 formed in one plate material 7a. The gas once flowed from the connecting pipe 6 to the gas passage 6a formed in the other plate member 7b, and then supplied into the primary chamber 4 through the opening 6b of the partition plate 7c. However, the design may be changed as appropriate so that the connecting pipe 6 is connected to the other plate 7b, or the gas is supplied from below into the primary chamber 4 in parallel with the mating surfaces of both plates 7a, 7b. The design may be changed.

  In the above embodiment, the boss portion 42 is protruded from the primary chamber 4 and the on-off valve 5 is attached. However, as shown in FIGS. 6 and 7, the on-off valve 5 is attached to the primary chamber 4 using a holder 8. You may attach to. The holder 8 holds four on-off valves 5 at a predetermined interval. The holder 8 is provided with mounting leg portions 81 at five locations. The on / off valve 5 may be airtightly attached to the primary chamber 4 by screwing the leg portion 81 in the vicinity of the primary chamber 4 and at a position where the manifold portion 3 is not formed. .

  In addition, this invention is not limited to an above-described form, You may add a various change in the range which does not deviate from the summary of this invention.

The figure which shows schematic structure of the hot-water supply apparatus with which this invention is applied The figure which shows the 1st form of this invention Exploded view of the first form Cross section The figure which shows the attachment process of the on-off valve by caulking The figure which shows a 2nd form Cross section

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hot water supply apparatus 2 Nozzle chamber 3 Manifold part 4 Primary chamber 5 On-off valve 6 Connection pipe 8 Holder 13 Burner unit 21 Nozzle 41 Gas passage port 42 Boss part 51 Flange 52 Mounting hole

Claims (5)

A nozzle chamber provided with a nozzle for ejecting gas to the gas burner, a manifold section that communicates the gas passage port of the primary chamber to which gas is supplied from the gas supply pipe and the nozzle chamber, and the primary chamber, In a gas supply apparatus having an on-off valve for opening and closing a gas passage port of a next chamber , one primary chamber and a nozzle are formed by sheet metal processing on one of two metal plate members having substantially the same outer shape. form, and the other to form a nozzle chamber communicating with each manifold portion and a plurality of the manifold portion, the opening serving as the gas passage opening corresponding to the manifold as well as in close contact with the opening portion of the primary chamber A gas supply apparatus characterized in that the two plate members are hermetically combined with a plurality of partition plates formed therebetween.   A boss that protrudes outward from the wall surface of the primary chamber is formed by pressing the boss, and this boss is press-fitted into the mounting hole formed in the on-off valve, or the boss that is inserted through the mounting hole is The gas supply device according to claim 1, wherein the on-off valve is attached to the primary chamber.   An opening / closing valve is held by the holder member, and an attachment leg is formed on the holder member, and the opening / closing valve is fixed to a position in the vicinity of the primary chamber where no manifold portion is formed. The gas supply device according to claim 1, wherein the gas supply device is attached to the primary chamber.   In the state where the partition plate is fitted to the peripheral edge of the primary chamber, and the partition plate is fitted into the step portion, the mating surface of the plate material on which the primary chamber is formed and the surface of the partition plate are flush with each other. The gas supply device according to any one of claims 1 to 3, wherein the gas supply device is configured as follows. The gas supply device according to any one of claims 1 to 4, wherein the partition plate is made of resin.

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