JP3682340B2 - Heat shield plate - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a heat shield, and can be used, for example, when the temperature rise of the casing is mitigated by being interposed between a heat exchanger in the water heater and the casing.
[0002]
[Prior art]
FIG. 9 is a side view of a partially cutaway water heater.
The casing (11) accommodates a combustor (12) having a gas burner and the like, and a heat exchanger (13) connected thereabove, and a back plate (110) of the casing (11) and the above-mentioned A heat shield (2) is provided between the heat exchangers (13), and the heat shield (2) is used to radiate heat from the heat exchanger (13) and to the heat exchanger (13). When an unexpected hole is formed, the exhaust heat leaking from the hole is prevented from being transmitted to the back plate (110).
[0003]
As shown in FIG. 10, the conventional heat shield plate (2) is formed in a tray shape in which the central portion of one metal plate is slightly depressed by a press, and a screw hole (28 ) (28) is drilled. The screw holes (28), (28) of the heat shield plate (2) are screwed to the mounting legs (15), (15) formed by projecting the back plate (110). ).
[0004]
[Problems to be solved by the invention]
However, since the conventional heat shield plate (2) is formed from a single metal plate, when this is heated by radiant heat from the heat exchanger (13) and thermally expanded, the heat shield plate (2 ) The thermal expansion of each part is reliably transmitted to the outer periphery, and the deformation force of the heat shield plate (2) is fixed to the fixing part of the screws (16) (16) → mounting legs (15) (15) → back plate This is transmitted to (110) and causes the back plate (110) to be deformed.
[0005]
In order to make the instrument compact, the gap between the heat shield plate (2) and the back plate (110) is set small (for example, the gap between the back plate (110) is currently set to about 2 mm). However, when the heat shield plate (2) is deformed, it comes into contact with the back plate (110). When the heat shield plate (2) comes into contact with the back plate (110), the former heat is directly transferred to the latter back plate (110), so that the heat shield function is not substantially performed.
[0006]
The invention of the present application aims to alleviate deformation of the heat shield plate (2) when the heat shield plate (2) is thermally expanded, and from the heat shield plate (2) to the back plate (110), etc. It is an object of the present invention to reduce the force transmitted to the mounting target part so as to suppress the adverse effect exerted on the mounting target part from the heat shield plate (2).
[0007]
[Means for Solving the Problems]
The means of the invention of claim 1 for solving the above-mentioned problem is as follows:
“It consists of multiple unit components that are connected so that there is no gap as a whole when viewed from the front and back direction.
The connecting portions between the adjacent unit component plates are locally coupled within a portion where these unit component plates are partially overlapped.
[0008]
According to the above means, the unit component plates constituting the heat shield plate (2) are connected only at the local coupling portion, and the portions other than the local coupling portion are in an unconnected state. Yes. Therefore, when attention is paid to a specific unit component plate that thermally expands, the deformation force of the unit component plate accompanying the thermal expansion is transmitted to the adjacent unit component plate only through the local coupling portion, and the local coupling is performed. In the non-connection region where the unit component plates other than the portion are not coupled to each other, since the thermal expansion can be freely performed, the deformation force is not transmitted to the adjacent unit component plates, and accordingly, the deformation force is the heat shield plate ( 2) It is difficult to be transmitted to the outer periphery of
[0009]
In addition, since each unit component plate is in a non-connected state other than the local coupling portion as described above, the deformation of the heat shield plate (2) can be reduced.
As in the second aspect of the invention, “the locally coupled portions are the caulking holes formed in the one unit component plate overlapped with each other, and the other portion overlapped with the one unit component plate. `` It is formed by partially protruding and projecting from the unit component plate and is composed of a caulking projection that is inserted into the caulking hole and caulked '', with respect to the caulking hole formed in one unit component plate, Since the caulking protrusion partially raised and protruded from the other unit component plate is caulked, a through hole penetrating the front and back, that is, a through hole causing heat leakage is not formed in the caulking portion.
[0010]
As in the third aspect of the invention, when “a pair of unit component plates that are locally coupled to each other is coupled at one location”, the deformation force of each unit component plate that thermally expands is a single caulking force. It is transmitted to the adjacent unit component plate via the location.
[0011]
【The invention's effect】
As described above, in the inventions of claims 1 to 3, since the deformation force of each unit component plate that thermally expands is difficult to be transmitted to the outer peripheral portion of the heat shield plate (2), for example, the heat shield plate (2 ), The deformation force of the heat shield plate (2) due to the thermal expansion is difficult to be transmitted to the mounting target part, and the mounting target part is adversely affected. It becomes difficult to give.
[0012]
In addition, since the deformation of the heat shield plate (2) can be alleviated, there is less concern that the heat shield plate (2) will be in contact with the mounting target portion, and there will be no problem that heat is directly transferred to the mounting target portion.
The heat shield plate (2) is not composed of a single metal plate as a whole, but is composed of a plurality of unit component plates. For example, a disc as a punching residue generated when a metal plate is pressed. It can also be manufactured by connecting rectangular plates or the like, and the plate material that has been discarded as scrap can be effectively used.
[0013]
In the invention of claim 2, since the through-hole that causes heat leakage is not formed in the crimped portion of each unit component plate, the heat insulating effect of the heat shield plate (2) is improved.
In the invention of claim 3, since the deformation force of each unit component plate is transmitted to the adjacent unit component plate via a single crimping location, the adjacent unit component plates are crimped at a plurality of locations. As compared with the above, the transmission path of the deformation force is reduced, and the deformation force is more difficult to be transmitted.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Next, an embodiment of the above invention will be described.
The heat shield plate (2) in FIG. 1 is disposed between the heat exchanger (13) and the casing (11) of the hot water heater as shown in FIG. 9, and is the first shown in FIG. Bending the intermediate product in Fig. 5 with one unit component plate (21) and four second and third unit component plates (22) and (23) shown in (b) and (c), respectively. It has been applied.
[0015]
Each of the first to third unit constituting plates (21), (22), and (23) is a disc-shaped punch produced when a punching process for forming an opening for a gas burner is performed on the top plate of the table stove. It was produced using waste.
The first unit constituting plate (21) shown in FIG. 2 (a) has upper and lower sides (211) (212) parallel to each other by cutting the peripheral portion of the metal disc linearly at a 90 ° pitch in the circumferential direction. ) And sides (213) and (214), and caulking holes (216) and (216) are formed in the vicinity of the upper and lower sides (211) and (212) and the sides (213) and (214). It is installed.
[0016]
The second unit component plate (22) shown in (b) of FIG. 2 is formed by cutting the upper part of the metal disk horizontally and obliquely cutting the region from the left and right sides to the lower part. Portions (221) (222) (223) are formed.
Note that the peripheral portions of the first and second unit component plates (21) and (22) are cut into a straight line, and the upper and lower sides (211) (212), the side sides (213) (214), and the straight portions (221) (222) ) (223) is formed when the first and second unit constituting plates (21) and (22) are subjected to a caulking process and a pressing process, which will be described later, and the linear portion and the like are brought into contact with each other for positioning. Because of that.
[0017]
Further, crimping holes (226) are formed in the left and right portions of the second unit component plate (22) in the vicinity of the outer peripheral edge thereof. Further, as shown in FIG. 3, a caulking protrusion (225) that integrally projects from the second unit component plate (22) is formed at the lower part of the second unit component plate (22).
The outer peripheral contour shape of the third unit component plate (23) shown in FIG. 2C is the same as that of the first unit component plate (21), and a pair of adjacent side sides (234) and lower sides ( In the vicinity of 232), a caulking projection (235) formed in the same manner as the caulking projection (225) is projected.
[0018]
When the heat shield plate (2) is manufactured using the first to third unit component plates (21), (22), and (23), the first unit component plate (21) is shown in FIG. The periphery of the four second unit component plates (22), (22), (22), and (22) is superposed from the direction of the back side of the paper surface, and the outer periphery of each of the latter second unit component plates (22) As shown in FIG. 4, the caulking protrusion (225) formed to protrude from the back surface is inserted into the caulking hole (216) of the first unit component plate (21) from the back side, and the protruding portion is caulked. The first unit component plate (21) and the second unit component plate (22) are connected and fixed in a polymerized state. In this case, the top of the caulking projection (225) after being crimped is in a closed state, and the inside of the caulking projection (225) is a blind hole closed on one side. Compared to the case, the heat shielding effect is improved. Further, the second unit component plates (22), (22), (22) are provided with straight portions (222), (223) at the periphery of the second unit component plates (22), (22), (22), (22). ) (22) (22) are overlapped with the first unit component plate (21), the ends of the second unit component plates (22) (22) (22) (22) do not overlap each other. I did it. Next, the third unit component plate (23) is overlaid on the lower surface of the second unit component plate (22), and the second unit component plate (22) has its back surface direction (the reverse direction of the paper surface in FIG. 5). ) Through the caulking hole (226), the caulking projection (235) of the third unit component plate (23) is inserted and projected, and the projecting portion is caulked, as shown in FIG. The plates (21), (22), and (23) are combined in a square plate shape with no gap as a whole. The second unit component plates (22), (22), (22) and (22) do not overlap each other, but the first unit component plate (21) abuts on one of these surfaces and the other surface Are in contact with the third unit component plates (23) (23) (23) (23), and the second unit component plates (21) (23) (23) (23) (23) are the second ones. Since the unit component plates (22), (22), (22), and (22) are sandwiched to form a three-layer structure as a whole, there is an advantage that the structure is stronger than a single-layer structure or a two-layer structure. is there. Further, when the screw holes (33) (33) are formed in the vicinity of the square portion of the square plate shape, the intermediate product shown in FIG. 5 is completed. In the above, adjacent unit constituent plates that are caulked and joined together are caulked and joined at one location, and each of the first to third unit constituent plates (21), (22), and (23) The deformation force based on the thermal expansion is transmitted to the adjacent unit component plate only through the single caulking location.
[0019]
Next, when the center part of the intermediate product in the state shown in FIG. 5 is slightly depressed by pressing and the outer peripheral part is punched into a predetermined shape, the heat shield plate (2) having the shape shown in FIGS. 1 and 6 is completed. To do. The heat shield plate (2) may be flattened without being depressed at the center, and only the outer peripheral portion may be punched.
Next, screw holes (33) formed in the heat shield plate (2) with respect to the four mounting legs (15) (15) protruding from the back plate (110) of the casing (11) shown in FIG. When the parts are coupled with screws (16) and (16) in correspondence with (33), as shown in the figure, a heat shield plate (110) is provided between the back plate (110) of the casing (11) and the heat exchanger (13). 2) is fixed.
[0020]
In this structure, the first to third unit constituting plates (21), (22), and (23) constituting the heat shield plate (2) are connected to one caulking coupling portion (35) (35) as shown in FIG. In FIG. 7, the portions other than the caulking coupling portions (35) and (35) are in a non-connected state. Therefore, for example, when the first unit component plate (21) and the second unit component plate (22) are thermally expanded, the unconnected region where they are not crimped is indicated by the imaginary line in FIG. As described above, the peripheral portions (219) and (229) of the first and second unit constituting plates (21) and (22) expand and contract independently. Therefore, in this region, since thermal expansion is performed freely, the deformation force due to the thermal expansion of the first unit component plate (21) or the second unit component plate (22) is affected by the other second unit component plate (22) or the second unit component plate (22). It is not transmitted to the one unit component plate (21), and the deformation in the vicinity of the region is absorbed by the first and second unit component plates (21) and (22) themselves. Therefore, the adverse effect of the thermal expansion of the heat shield plate (2) is not easily transmitted to the back plate (110) side through the screws (16) (16) and the mounting legs (15) (15). The back plate (110) is hardly deformed by the above.
[0021]
Further, as described above, in the unconnected region of the first unit component plate (21) and the second unit component plate (22), the deformation due to thermal expansion is caused by the other second unit component plate (22) and the first unit component plate. Since it is not transmitted to the plate (21), deformation of the heat shield plate (2) itself is also alleviated.
As a result, even if the gap between the heat shield plate (2) and the back plate (110) is reduced (for example, about 2 mm) for compactness, the heat shield plate (2) is deformed and the back plate ( 110), the heat shield plate (2) comes into contact with the back plate (110) and heat is transferred to the heat shield plate (2), and the heat loss of the heat shield plate (2) can be prevented.
[0022]
In addition, since the plurality of first to third unit constituting plates (21), (22), and (23) are connected and formed, when the gas burner through-hole formed in the top plate of the table stove is punched out Even if it is a small scrap material such as a disk-shaped punched residue generated in the above, the heat shield plate (2) can be made by making effective use of this.
FIG. 9 shows an example in which the heat shield plate (2) is used to shield heat between the heat exchanger of the water heater and the casing (11). It can be used as various heat shielding plates as in the case where the gap is thermally blocked.
[0023]
In the above embodiment, the heat shield plate (12) is fixed to the back plate (110) with screws (16) and (16) via the mounting legs (15) and (15). ) (15), the heat shield plate (12) may be directly attached to the back plate (110) with screws (16) (16).
In the above embodiment, the adjacent unit component plates are connected to each other by using the caulking protrusions (225) (235) integrally projected from the second and third unit component plates (22) and (23). The caulking connection is made, but caulking holes are formed in each of the first to third unit constituting plates (21), (22), and (23), and each unit constituting plate is caulked using the caulking holes and rivets inserted into the caulking holes. May be combined.
[0024]
Moreover, you may couple | bond together each adjacent unit component board locally by spot welding.
In the above embodiment, since each unit component plate is crimped using the caulking protrusions (225) (235) integrally projected from the unit component plate, the crimping operation and the heat shield plate are performed. The bending and punching operations of (2) can be performed simultaneously with a press. Accordingly, the workability is improved as compared with the case where the unit constituting plates are joined by spot welding and then bent. Unlike the case of using the rivet, a special member (rivet) for caulking is not required, and the number of parts can be reduced.
[0025]
Furthermore, in the above embodiment, the first to third unit component plates (21), (22), and (23) are sequentially stacked to form the three-layer structure heat shield plate (2). ), The first unit component plate (26) having caulking holes (261) (261) (261) around it and the second unit component plate similarly having caulking holes (271) (271). (27) (27) (27) (27) are assembled in the same plane as shown in the figure, and the third unit component plate (28) (28) ( 28) (28) (28) are superimposed (see the imaginary line in (a)), and the caulking projections (281) (281) formed on the third unit component plates (28) (28) (28) (28) ) May be used as the heat shield plate (2) having a two-layer structure in which the crimping holes (261) (271) of the first and second unit constituting plates (26) and (27) are inserted and crimped.
[Brief description of the drawings]
FIG. 1 is a plan view of a heat shield plate (2) according to an embodiment of the invention of the present application. FIG. 2 is a plan view of a second unit component plate (22) and a third unit component plate (23) (24) appearing in FIG. FIG. 3 is an enlarged cross-sectional view of the main part of the III-III line in FIG. 2. FIG. 4 is a detailed view of the caulking portion of the first unit component plate (21) and the second unit component plate (22). [Fig. 5] Plan view of intermediate product before pressing heat shield plate (2) [Fig. 6] Side view of heat shield plate (2) of Fig. 1 [Fig. 7] First unit component plate (21) and second plate Enlarged view of the non-bonded part of the 1 unit component plate (21). [FIG. 8] Explanatory drawing of a modified example of the coupling mode of the first to third unit component plates (26), (27), and [28]. Sectional view showing application example of plate (2) [Fig. 10] Explanatory drawing of conventional example [Explanation of symbols]
(2) ・ ・ ・ Heat shield
(21) ・ ・ ・ First unit component board
(22) ... Second unit component plate
(23) ... Third unit component plate
(225) (235) ・ ・ ・ Screw protrusion
(216) (226) ・ ・ ・ Caulking hole

Claims (3)

Consists of a plurality of unit component plates that are connected so that no gap occurs as a whole when viewed from the front and back directions,
The connecting portions of the adjacent unit component plates are locally connected to each other in a portion where the unit component plates are partially overlapped. The locally coupled portions are partially raised and protruded from the caulking holes formed in the one unit component plate overlapped with each other and the other unit component plate stacked on the one unit component plate. The heat-insulating plate according to claim 1, wherein the heat-insulating plate is formed by a caulking projection formed by being inserted into the caulking hole and caulked. The heat shield plate according to claim 1 or 2, wherein the pair of unit component plates that are locally coupled to each other are coupled at a single location.

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