JP6641989B2 - Manifold for gas supply - Google Patents

Description

The present invention relates to a gas supply manifold to be used as such as a component of a burner device for a water heater.

For example, a burner device in a gas combustion type hot water supply device is generally configured to supply fuel gas from a gas supply manifold to a plurality of burner heads (combustion tubes). Here, examples of the gas supply manifold include those described in Patent Documents 1 and 2.
The gas supply manifold described in these documents includes a body member provided with a plurality of gas ejection nozzles, and a lid that forms a gas supply channel between the body member and the body member by being superimposed on the body member. The member is caulked and fastened. This caulking fastening is such that a protrusion provided on one of the main body member and the cover member is inserted into a hole provided on the other to partially protrude outside the hole, and The diameter is made larger than the hole by pressing. Thus, a part of the protruding portion serves as an engaging portion that engages with the peripheral edge of the hole.
According to such a configuration, unlike the case where the main body member and the lid member are screwed, it is not necessary to use or reduce the use of screw parts, so that the manufacturing cost of the gas supply manifold can be reduced. It is possible.

  However, the caulking fastening according to the above-mentioned prior art is a method of forming an engaging portion that engages with a peripheral portion of a hole by simply compressing and deforming a part of a caulking protrusion penetrating the hole. It merely employs means such as increasing the diameter. For this reason, when the amount of compressive deformation of the protruding portion of the convex portion is increased to increase the outer diameter of the engaging portion, the thickness of the entire engaging portion is reduced, and the strength of the engaging portion and, consequently, the swaging strength are reduced. There is a possibility that it will be lower. On the other hand, when the amount of compressive deformation of the protruding portion of the projection is reduced to increase the thickness of the engagement portion, the outer diameter of the engagement portion decreases, and the engagement between the engagement portion and the peripheral edge of the hole portion decreases. Since the area is small, there is a possibility that the swaging strength is also low. For this reason, conventionally, it is not easy to caulk the main body member and the lid member in an appropriate state, and there is still room for improvement in increasing productivity.

JP-A-2003-65507 Japanese Patent No. 4104005

The present invention has been proposed under the circumstances described above, to provide a gas supply manifold capable of appropriately swaging the body member and the lid member, the problem And

  In order to solve the above problems, the present invention takes the following technical measures.

Gas supply manifold further provided to the onset Ming, a body member having a plurality of gas ejection nozzle is provided, is superimposed on the body member, and the plurality of gas ejection nozzle between said body member A lid member that forms a communicating gas supply flow path, and a projection provided on one of the main body member and the lid member penetrates a hole provided on the other and protrudes from the hole, and The protruding portion is a gas supply manifold having a caulking portion having a larger diameter or a wider width than the hole and forming an engaging portion that engages with a peripheral portion of the hole. At a substantially central portion on the distal end side of the convex portion, a concave portion is provided by this portion being pressed toward the base side of the convex portion, and the concave portion is located around the concave portion of the convex portion. region are between the engaging portion, the recess portion A bottom surface and a sloped inner peripheral surface having an inner diameter that increases from the bottom surface portion toward the distal end of the protrusion are formed, and the sloped inner peripheral surface of the recess is formed of the protrusion. As it goes to the tip side, the inclination angle is a convex curved surface approaching an angle orthogonal to the axial length direction of the projection, and in the tip end surface of the projection, a region corresponding to the engagement portion Is characterized in that a flat portion having an angle substantially orthogonal to the axial direction of the convex portion is formed .

  According to such a configuration, the volume of the engaging portion located around the concave portion can be increased by the amount of the concave portion formed at the substantially central portion on the distal end side of the convex portion. For this reason, it is possible to increase the outer diameter or width of the engaging portion while increasing the thickness of the engaging portion, and due to the insufficient thickness of the engaging portion or the small outer diameter or width, the swaging strength is reduced. It is possible to make it difficult to cause the problem of lowering. For this reason, the operation of caulking the main body member and the lid member can be appropriately and easily performed, and the productivity of the gas supply manifold can be increased.

Further , according to such a configuration, the volume of the depression can be increased, which is more preferable in increasing the volume of the engagement portion. In addition, if the inner peripheral surface of the recess is inclined as described above, it is easy to increase the outer diameter or the width of the engaging portion.

Further , according to such a configuration, the outer diameter or the width of the engagement portion can be more easily increased.

Further , according to such a configuration, in the area of the flat portion, the engaging portion can be strongly pressed against the peripheral portion of the hole, and the adhesion between the engaging portion and the peripheral portion of the hole can be improved. Can be enhanced.

  In the present invention, preferably, of the main body member and the lid member, the member on the side where the hole is provided has a thickness in a peripheral region of the hole smaller than a thickness in other regions. Configuration.

  According to such a configuration, it is possible to increase the projecting dimension of the projection from the hole, and thus it is more preferable to increase the outer diameter or width of the engagement portion while increasing the thickness of the engagement portion. It will be.

  In the present invention, preferably, the convex portion has a two-stage convex structure in which a second convex portion having an outer diameter or a width smaller than that of the first convex portion is provided on a tip side of the first convex portion. The member of the main body member and the lid member, on the side where the hole is provided, is in contact with the distal end surface of the first protrusion, and the second member is in contact with the hole. The engaging portion is formed using the second convex portion by setting the convex portion to be inserted therethrough, and the first convex portion is provided between the main body member and the lid member. A seal packing provided with a through-hole through which is inserted is sandwiched.

  According to such a configuration, when assembling the gas supply manifold, of the main body member and the lid member, the member on the side where the convex portion of the two-step convex structure is provided has the convex portion in the upward position. In this state, it is possible to adopt a method in which a sealing gasket is placed thereon, the member on the side provided with the hole is further placed thereon, and then the first convex portion is caulked. In this case, when the first protrusion is inserted into the hole, the state can be confirmed from above. For this reason, the productivity of the gas supply manifold can be further increased.

  Other features and advantages of the present invention will become more apparent from the following description of embodiments of the invention with reference to the accompanying drawings.

(A) is a front view showing an example of the gas supply manifold according to the present invention, and (b) is a rear view thereof. 1A is a sectional view taken along the line IIa-IIa in FIG. 1A, and FIG. 1B is a sectional view taken along the line IIb-IIb in FIG. FIG. 2 is an exploded rear view of the gas supply manifold shown in FIG. 1. FIG. 4 is an enlarged cross-sectional view of a portion IV in FIG. 2B, showing an example of a caulking structure. (A), (b) is principal part sectional drawing which shows an example of the manufacturing process of the crimp structure shown in FIG. It is principal part sectional drawing which shows the other example of the swaging structure in this invention. (A) is a principal part sectional view showing another example of the caulking structure in the present invention, and (b) is a principal part sectional view showing the configuration before the caulking. FIG. 8 is a cross-sectional view of a main part showing a comparison with FIG. 7 (however, this is a diagram corresponding to an embodiment of the present invention). (A) is a side view of a main part showing another example of the punch, and (b) is a cross-sectional view taken along the line IX-IX of (a).

  Hereinafter, preferred embodiments of the present invention will be specifically described with reference to the drawings.

  The gas supply manifold A shown in FIGS. 1 to 3 is one of the components constituting a burner device of a gas fired hot water supply device, and supplies fuel gas to a plurality of burner heads (combustion pipes) provided in the burner device. It is for supply. The gas supply manifold A is configured by combining a main body member 2 and a lid member 1 each having a metal plate shape.

The main body member 2 is formed by integrally forming a plurality of gas ejection nozzles 25 by press molding, and is a so-called nozzle plate. The lid member 1 is stacked on the back side of the main body member 2 via a seal packing 3. A plurality of gas supply channels 29 communicating with the plurality of gas ejection nozzles 25 are formed between the lid member 1 and the main body member 2. As means for forming the plurality of gas supply channels 29, a plurality of bulging portions 28 bulging in a direction away from the main body member 2 and forming a streak shape in a rear view are formed in the lid member 1. I have. The inside portion of each bulging portion 28 is a gas supply channel 29.

  A plurality of openings 26 for allowing the fuel gas to flow into each of the plurality of gas supply passages 29 are formed in the lower region of the main body member 2. As shown in FIG. 2A, the gas supply manifold A is used by being attached to an auxiliary member 8 for supplying fuel gas, and the fuel gas supplied from a gas pipe (not shown) is used for the auxiliary member 8. The gas flows through the gas supply passage 81 in the inside and the above-mentioned opening 26 and flows into the gas supply passage 29 of the gas supply manifold A. An opening / closing valve V having a valve element 80 for opening and closing the opening 26 is attached to the auxiliary member 8. A flow control valve (not shown), an original electromagnetic valve, and the like are appropriately attached to the auxiliary member 8.

The main body member 2 and the lid member 1 are fastened using a caulking portion C as shown in FIG.
In the figure, a hole 10 is provided through the cover member 1. The main body member 2 is formed with a convex portion 20 penetrating the hole portion 10, and a projecting portion of the convex portion 20 protruding from the hole portion 10 has a diameter larger than that of the hole portion 10. The region near the outer peripheral edge of the portion is an engaging portion 22 that comes into contact with and engages with the peripheral edge of the hole 10. The convex portion 20 has a concave portion 21 formed by pressing a substantially central portion on the distal end side of the convex portion 20 toward the base side of the convex portion 20, and is located around the concave portion 21. The area is the engaging portion 22.

  The depression 21 forms a bottom surface 21 a having a certain area, and an inclined inner peripheral surface 21 b whose inner diameter increases from the bottom surface 21 a toward the distal end of the projection 20. The inclined inner peripheral surface 21b is preferably a convex curved surface having an appropriate radius of curvature R, and the inclination angle of the inclined inner peripheral surface 21b with respect to the axial length direction of the convex portion 20 increases toward the distal end side of the convex portion 20. It is a curved surface approaching an orthogonal angle (horizontal angle in FIG. 4). At least in the outer peripheral edge region of the engaging portion 22, a flat portion 22a connected to the above-mentioned convex curved inner peripheral surface 21b is formed. The plane portion 22a has an angle substantially orthogonal to the axial direction of the projection 20.

The caulking portion C described above can be manufactured through a process as shown in FIG.
That is, first, as shown in FIG. 1A, a hole 10 is formed in the lid member 1, and a projection 20 is formed in the main body member 2. The projection 20 is formed by performing drawing (extrusion) so that a recess 24 is formed on the opposite surface of the main body member 2. The width of the concave portion 24 is formed to be equal to or larger than the width of the convex portion 20. Thereby, the engagement can be further strengthened. Next, as shown in FIG. 2B, the lid member 1 and the main body member 2 are overlapped with each other with the sealing gasket 3 interposed therebetween, and the convex portion 20 is inserted into the hole portion 10, and the tip portion is formed into a hole. It protrudes from the part 10. Thereafter, the protruding portion of the convex portion 20 is pressed using the punch 7 and deformed. At this time, the position of the concave portion 24 is backed up by an appropriate member so that the main body member 2 does not unduly bend downward. A projecting portion 70 for forming the recess 21 shown in FIG. 4 is formed at the tip of the punch 7. Intensively to the base side of. Thereby, the amount of deformation of the convex portion 20 in the radial direction outward of the hole portion 10 is increased, and the caulking portion C shown in FIG. 4 can be appropriately formed.
As shown in FIG. 1, the caulking portions C are provided at a plurality of locations in a dispersive arrangement at appropriate intervals so that an unreasonable gap that causes a gas leak or the like is not generated at each location of the gas supply manifold A. Considered.

In the gas supply manifold A described above, the lid member 1 and the main body member 2 can be appropriately caulked using the plurality of caulked portions C. The volume of the engaging portion 22 around the concave portion 21 can be increased by the amount of the concave portion 21 formed at the substantially central portion on the distal end side of the convex portion 20 constituting the caulking portion C. The outer diameter D can be increased while increasing the thickness t1 of the engagement portion 22. Therefore, while the strength of the engaging portion 22 is increased, the state of engagement between the engaging portion 22 and the lid member 1 can be made reliable and strong. In particular, the concave portion 21 has a large volume having a bottom surface portion 21a having a certain area, and the inner peripheral surface 21b is the above-mentioned inclined surface, and furthermore, the above-mentioned convex curved surface, so that the engaging portion 22 is more preferable in increasing the volume. The flat portion 22 a of the engaging portion 22 is a portion that increases the pressure contact force between the engaging portion 22 and the lid member 1.
For this reason, the swaging strength can be increased. In addition, since setting work such as press pressure when pressing and deforming the convex portion 20 is facilitated as compared with the related art, crimping fastening work is also facilitated, and productivity of the gas supply manifold A is increased. be able to.

  6 to 9 show another embodiment of the present invention. In these drawings, elements that are the same as or similar to those of the above-described embodiment will be denoted by the same reference numerals as those of the above-described embodiment, and redundant description will be omitted.

In the embodiment shown in FIG. 6, the thickness t2 of the peripheral region of the hole 10 in the cover member 1 is smaller than the thickness t3 of the other region. Such a configuration is obtained by subjecting the lid member 1 to press working.
According to such a configuration, it is possible to increase the thickness t4 of the engagement portion 22 and increase the strength thereof by an amount corresponding to the reduction in the thickness t2 of the peripheral region of the hole 10.

In the embodiment shown in FIG. 7A, the convex portion 20 of the main body member 2 has a two-step convex structure, and is provided continuously with the first convex portion 20a and the distal end side of the first convex portion 20a. And a second protrusion 20b having an outer diameter smaller than that of the first protrusion 20a. The lid member 1 is in contact with the first protrusion 20a, and the second protrusion 20b is inserted into the hole 10. A part of the distal end side region of the second convex portion 20b is an engaging portion 22. Between the main body member 2 and the lid member 1, a seal packing 3 provided with a through hole 30 through which the first projection 20a passes is sandwiched.
The structure of the caulking portion C having such a configuration is manufactured in a manner as shown in FIG. 2B, and after setting the main body member 2 in a posture in which the convex portion 20 faces upward, the main body member 2 is placed on the main body member 2. The seal packing 3 and the lid member 1 are sequentially placed, and then the second convex portion 20b is compressed and deformed. The sealing packing 3 can be positioned using the fitting between the first projection 20a and the through hole 30. The first projection 20a has a size that allows the sealing gasket 3 to be compressed during crimping.

  In the assembling work in the mode shown in FIG. 7, when performing the work of inserting the second convex portion 20b into the hole 10, it is necessary to visually check from above whether or not the work has been properly performed. Can be. For example, in the configuration shown in FIG. 8, the sealing packing is provided on the lid member 1 because a convex portion or the like (not shown) for positioning with the sealing packing 3 is provided on the lid member 1. 3 on which the main body member 2 is placed. In this case, the convex portion 20 faces downward. However, in such a mode, it is difficult to determine whether the convex portion 20 has been properly inserted into the hole 10. On the other hand, according to the present embodiment shown in FIG. 7, such a problem can be eliminated. Further, it is not necessary to provide a convex portion or the like for positioning the seal packing 3 on the lid member 1.

In the embodiment shown in FIG. 9, the projection 70 at the tip of the punch 7A has a substantially cross shape in cross section. If such a punch 7A is used, the depression 21 has a substantially cross shape corresponding to the projection 70. Even with such a configuration, the operation intended by the present invention can be obtained. The concave portion according to the present invention is not limited to a circular shape in plan view, but may be a non-circular shape.

The present invention is not limited to the contents of the above-described embodiment. The specific configuration of each part of the gas supply manifold according to the present invention can be variously modified within the range intended by the present invention .

In the above-described embodiment, the convex portion is formed in the main body member, and the hole for projecting the convex portion is formed in the lid member. On the contrary, the hole is formed in the main body member, and the lid is formed. A configuration in which a convex portion is formed on the member may be adopted.
The gas supply manifold according to the present invention is not limited to the burner device of the hot water supply device, and its specific application is not limited.

A Gas supply manifold C Caulking part 1 Cover member 10 Hole part 2 Body member 20 Convex part 21 Depression part 21a Bottom part 22 Engagement part 22a Flat part 25 Gas ejection nozzle 29 Gas supply flow path 3 Seal packing 7, 7A Punch

Claims (3)

A main body member provided with a plurality of gas ejection nozzles,
A lid member that is stacked on the main body member and forms a gas supply flow path between the main body member and the plurality of gas ejection nozzles,
A projection provided on one of the main body member and the lid member penetrates a hole provided on the other and protrudes from the hole, and the projection has a larger diameter than the hole or A caulking portion that is wide and forms an engaging portion that engages with a peripheral portion of the hole portion;
A gas supply manifold comprising:
At a substantially central portion on the tip side of the convex portion, a concave portion is provided by this portion being pressed toward the base side of the convex portion, and an area of the convex portion located around the concave portion Are the engaging portions ,
The recessed portion forms a bottom surface and a sloped inner peripheral surface having an inner diameter that increases from the bottom surface toward the distal end of the protrusion,
The inclined inner peripheral surface of the concave portion is a convex curved surface whose inclination angle approaches an angle orthogonal to the axial direction of the convex portion as it goes to the tip side of the convex portion,
A gas supply, characterized in that a flat portion having an angle substantially orthogonal to an axial length direction of the convex portion is formed in a region corresponding to the engaging portion on a distal end surface of the convex portion. For manifold. The gas supply manifold according to claim 1, wherein:
Of the main body member and the lid member, the member on the side where the hole is provided has a configuration in which the thickness of the peripheral region of the hole is smaller than the thickness of other regions. Manifold for gas supply. The gas supply manifold according to claim 1 or 2 ,
The convex portion has a two-step convex structure in which a second convex portion having an outer diameter or a width smaller than that of the first convex portion is provided on the distal end side of the first convex portion,
Of the main body member and the lid member, the member on the side where the hole is provided abuts on the distal end surface of the first protrusion, and the second protrusion is inserted through the hole. Being set in a state, the engaging portion is formed using the second convex portion,
A gas supply manifold , wherein a seal packing provided with a through-hole through which the first protrusion penetrates is interposed between the main body member and the lid member .

Images