JPH1019386A - Heat shield plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the deformation of a heat shield plate on the occasion of thermal expansion of the heat shield plate and also to lessen a force transmitted from the heat shield plate to a part to which the plate is fitted, such as a back plate, by a construction wherein unit component plates making up the heat shield plate are connected with each other only at local connecting parts. SOLUTION: First to third unit component plates 21, 22 and 23 are connected with each other only at one calking connection part 35 respectively. The part other than the calking connection part 35 is put in a non-connected state. Since thermal expansion takes place freely in a non-connected area, a force of deformation of the first unit component plate 21 or the second unit component plate 22 caused by the thermal expansion is not transmitted to others and the deformation in the vicinity of this area is absorbed by the first or second unit component plate 21 or 22. Accordingly, the adverse effect of the thermal expansion of the heat shield plate is hardly transmitted to a back plate and deformation of the back plate hardly occurs.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat shield plate, and can be used, for example, in a case where a heat exchanger in a water heater and a casing are interposed to reduce a rise in the temperature of the casing.

[0002]

2. Description of the Related Art FIG. 9 is a side view of a partially cutaway water heater. In the casing (11), a combustor (12) having a gas burner and the like and a heat exchanger (13) connected thereabove are accommodated, and a back plate (110) of the casing (11) and the A heat shield (2) is provided between the heat exchangers (13), and the heat shield (2) allows the radiant heat from the heat exchanger (13) and the heat exchanger (13) to be provided. Exhaust heat leaked from the hole when an unexpected hole is formed is prevented from being transmitted to the back plate (110).

As shown in FIG. 10, the conventional heat shield plate (2) is formed in a tray shape in which a central portion of one metal plate is slightly depressed by pressing, and a screw is formed on an outer peripheral flange. Hole
(28) and (28) are drilled. The screw holes (28) and (28) of the heat shield plate (2) are attached to the mounting legs (15) and (15) formed by projecting the back plate (110). ).

[0004]

However, since the above-mentioned conventional heat shield plate (2) is formed from a single metal plate, it is heated by the radiant heat from the heat exchanger (13) to generate heat. When expanded, the thermal expansion of each part in the heat shield plate (2) is reliably transmitted to the outer periphery thereof, and the deformation force of the heat shield plate (2) is screwed.
(16) The fixing portion of (16) → the mounting legs (15) (15) → the rear plate (110) is transmitted to cause deformation of the rear plate (110).

[0005] In order to make the equipment compact, a heat shield plate (2)
The gap between the back plate (110) and the back plate (110) is small.
The current gap is set to about 2 mm), but if the heat shield plate (2) is deformed, it will be
0) comes in contact with. And the heat shield (2) is the back plate (110)
When the contact is made, the heat of the former is directly transmitted to the back plate (110) of the latter, so that the heat shielding function is not substantially performed.

The invention of the present application aims at alleviating the deformation of the heat shield plate (2) when the heat shield plate (2) thermally expands, and at the same time, from the heat shield plate (2) to the rear plate (110). It is an object of the present invention to reduce the force transmitted to the mounting target portion, such as), so as to suppress the adverse effect on the mounting target portion from the heat shield plate (2).

[0007]

Means for Solving the Problems According to a first aspect of the present invention, there is provided a device comprising a plurality of unit component plates which are connected so that no gap is formed as a whole when viewed from the front and back. And the connecting portions of the adjacent unit component plates are locally connected in a portion where these unit component plates are partially overlapped with each other. "

According to the above-mentioned means, each unit component plate constituting the heat shield plate (2) is connected only at the local connection portion, and the portions other than the local connection portion are in the non-connection state. It has become. Therefore, when attention is paid to a specific unit component plate that thermally expands, the deformation force of the unit component plate due to thermal expansion is transmitted to the adjacent unit component plate only through the local coupling part, and the local coupling is performed. In the non-connection region where the unit component plates other than the part are not connected to each other, since the thermal expansion can be freely performed, the deformation force is not transmitted to the adjacent unit component plates,
To that extent, it becomes difficult for the deformation force to be transmitted to the outer peripheral portion of the heat shield plate (2).

In addition, since each unit component plate is in a non-coupled state except for the local coupling portion as described above, the deformation of the heat shield plate (2) can be reduced. As in the invention according to claim 2, "the locally coupled portion is formed by a caulking hole formed in one of the unit component plates that are overlapped with each other, and the other portion that is overlapped by the one unit component plate. And a caulking projection formed by partially projecting and protruding from the unit component plate and being caulked by being inserted into the caulking hole '', for a caulking hole formed on one of the unit component plates, Since the caulking projection partially protruded from the other unit component plate is caulked, a through-hole penetrating from the front to the back, that is, a through-hole causing heat leakage is not formed in the caulking portion.

[0010] When the pair of unit component plates that are locally connected to each other are connected at one location as in the invention of claim 3, the deformation force of each of the thermally expanding unit component plates is simple. It is transmitted to the adjacent unit component plate via one caulking point.

[0011]

As described above, according to the first to third aspects of the present invention, the deformation force of each of the thermally expanding unit component plates is reduced by the heat shielding plate.
Since it is difficult to transmit to the outer peripheral portion of (2), for example, the heat shield plate (2)
Even if the peripheral part of is fixed to the mounting target part with screws etc.
It becomes difficult for the deformation force of the heat shield plate (2) due to the thermal expansion to be transmitted to the attachment target portion, and the attachment target portion is not adversely affected.

Further, since the deformation of the heat shield plate (2) can be reduced,
There is less fear that the heat shield plate (2) will come into contact with the mounting target portion, and there is no problem that heat is directly transmitted to the mounting target portion. Since the whole heat shield plate (2) is not composed of a single metal plate, but composed of multiple unit component plates,
For example, it can be manufactured by connecting a circular plate, a rectangular plate, or the like as a punching waste generated when a metal plate is press-punched, and it is possible to effectively use a plate material that has been disposed of as a scrap.

According to the second aspect of the present invention, the heat insulating effect of the heat shield plate (2) is improved because the through hole which causes the leakage of heat is not formed in the swaged portion of each unit component plate. According to the third aspect of the present invention, since the deformation force of each unit component plate is transmitted to the adjacent unit component plates via a single caulking point, the adjacent unit component plates are caulked at a plurality of locations. As compared with the above, the number of transmission paths of the deformation force is reduced, and the deformation force is more difficult to be transmitted.

[0014]

Next, an embodiment of the present invention will be described. The heat shield plate (2) of FIG. 1 is provided between the heat exchanger (13) of the water heater and the casing (11) as shown in FIG. One unit component board (21),
(B) The intermediate product of FIG. 5 in which the second and third unit component plates (22) and (23) shown in (c) are caulked four by four, respectively, and subjected to bending or the like.

Each of the first to third unit component plates (21), (22) and (23)
Is manufactured by using a disc-shaped scum generated when press-cutting processing for forming an opening for a gas burner is performed on a top plate of a table stove. The first unit component plate (21) shown in (a) of FIG. 2 is obtained by cutting off the peripheral portion of the metal disk linearly at 90 ° pitch in the circumferential direction, thereby forming upper and lower sides (211) and (212) parallel to each other. ) And side edges (213) and (214), and the upper and lower sides (211) and (212) and the side edges (2
13) In the vicinity of (214), caulking holes (216) and (216) are formed.

The second unit component plate (22) shown in FIG.
Is formed by cutting off the upper part of the metal disk horizontally and diagonally cutting off the area from the left and right sides to the lower part.The straight part (221) (222) (22
3) is formed. In addition, the first and second unit component plates (21)
Cut the edge of (22) in a straight line and cut the upper and lower sides (211) (21
2) and the side portions (213) (214) and the straight portions (221) (222) (223) are formed on the first and second unit component plates (21) and (22) by a caulking process described later. This is because the linear portion and the like are brought into contact with each other for positioning when pressing is performed.

In the left and right portions of the second unit component plate (22), caulking holes (226) are formed near the outer peripheral edge thereof. or,
As shown in FIG. 3, a lower part of the second unit component plate (22) is formed with a caulking projection (225) integrally projecting therefrom. The outer peripheral contour shape of the third unit component plate (23) shown in (c) of FIG. 2 has the same shape as the first unit component plate (21), and a pair of adjacent side edges (234) and a lower edge ( In the vicinity of the caulking projection (225), a caulking projection (235) formed in the same manner as the caulking projection (225) protrudes.

Each of the first to third unit component plates (21), (22), (23)
When the heat shield plate (2) is manufactured by using the first unit component plate (21), the four second unit component plates (22) are arranged from the direction on the back side of the paper surface in FIG. The peripheral portions of (22), (22) and (22) are superimposed, and a caulking projection (225) projecting near the outer periphery of each of the second unit component plates (22) is attached to the first unit component plate (21). The first unit component plate (21) and the second unit component plate (22) are overlapped as shown in FIG. 4 by inserting and projecting from the back side into the caulking hole (216) of FIG. Connect and fix to the state. In this case, the crimping projection after crimping (225)
The top portion is in a closed state, and the caulking projection (225)
Since the inside is a blind hole closed on one side, the heat shielding effect is improved as compared with the case where this is a through hole. or,
The second unit component plates (22), (22), (22), (22) are provided with linear portions (222), (223) on the periphery of the second unit component plates (22), (22), (22), (22). 22) When the (22) is superimposed on the first unit component plate (21), the ends of the second unit component plates (22), (22), (22) and (22) do not overlap each other. did. Next, the third unit component plate (23) is superimposed on the lower surface of the second unit component plate (22), and the second unit component plate (22) is placed in the back direction (the back side direction of the paper surface in FIG. 5). ), The projection for crimping (235) of the third unit component plate (23) is inserted into the caulking hole (226) and protruded, and the protruding portion is caulked, as shown in FIG. The plates (21), (22) and (23) are combined in a square plate shape without any gap as a whole. Second unit component board (22) (22) (22) (22)
The first unit component plate (21) abuts on one of these surfaces and the third unit component plate (23) (23) (23) (23) (23) ) Is in contact with
The third unit component plate (21) (23) (23) (23) (23) is the second unit component plate
(22) Since (22), (22), and (22) are sandwiched between them to form a three-layer structure as a whole, there is an advantage that the structure is more robust than a one-layer structure or a two-layer structure. Furthermore,
When screw holes (33) and (33) are formed near the square portion of the square plate, an intermediate product shown in FIG. 5 is completed. In the above, adjacent unit component plates caulked to each other are in a state caulked at one place, and each of the first to third unit component plates (21) (22) (23) The deformation force based on the thermal expansion is transmitted to the adjacent unit component plate only through the single caulking point.

Next, the center part of the intermediate product in the state shown in FIG. 5 is slightly depressed with a press, and at the same time, the outer peripheral part is punched out into a predetermined shape, so that the heat shield plate (2) having the shape shown in FIGS. ) Is completed. Note that the heat shield plate (2) may be flat without depressing the central portion thereof, 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) projecting from the back plate (110) of the casing (11) shown in FIG. When the parts are combined 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 arranged and fixed.

In this case, the first heat shield plate (2)
As shown in FIG. 5, the third unit component plates (21), (22), and (23) are connected only at one caulking joint (35) (35), and the caulking joint (35) Portions other than (35) are in an unconnected state as shown in FIG. Therefore, for example, when the first unit component plate (21) and the second unit component plate (22) thermally expand, in a non-connection region where they are not caulked,
As shown by the imaginary line in FIG. 7, the first and second unit component plates (21) (2)
The peripheral portions (219) and (229) of (2) extend and contract independently of each other. Therefore, in this region, since the 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 reduced by another second unit component plate (22) or the second unit component plate (22). The deformation near the region is not transmitted to the one-unit component plate (21), and
It is absorbed by the unit component plates (21) and (22) themselves. Therefore,
The adverse effect of thermal expansion of the heat shield (2) is due to the screws (16) (16) and the mounting feet.
(15) It is difficult to transmit to the back plate (110) side via (15), and the back plate (110) is less likely to be deformed by the action of an excessive force.

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 the thermal expansion is caused by the other second unit component plate (22) and the second unit component plate (22). Since it is not transmitted to the one-unit component plate (21), the deformation of the heat shield plate (2) itself is reduced. When the gap between the heat shield plate (2) and the back plate (110) is reduced for compactness (for example, about 2 mm)
However, it is possible to prevent the heat shield plate (2) from being deformed and coming into contact with the back plate (110), and the heat shield plate (2) comes into contact with the back plate (110) and heat is transferred thereto. As a result, the inconvenience of loss of function of the heat shield plate (2) can be prevented.

A plurality of first to third unit component plates (21) and (22)
Since (23) is formed by connecting, even if it is a small scrap material such as a disc-shaped scrap generated when a through hole for a gas burner formed in the top plate of the table stove is pressed and pressed, This can be used effectively to make the heat shield (2). 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 shields, as in the case where the space is thermally shut off.

In the above embodiment, the mounting legs (15) and (15)
The heat shield plate (12) is fixed to the back plate (110) with screws (16) (16), but the heat shield plate (12) is attached without mounting feet (15) (15). The screws (16) (16) may be directly attached to the rear plate (110). In the above embodiment, the second and third unit component plates are used.
(22) (23) (2) (2)
35), the adjacent unit component plates were caulked to each other, but caulking holes were formed in each of the first to third unit component plates (21), (22), (23), and the caulking holes and Each unit component plate may be caulked and connected using a rivet inserted into the unit.

Further, adjacent unit component plates may be locally connected by spot welding. In the above embodiment,
Projection for caulking (225) integrally protruded from the unit component plate
Since each unit component plate is caulked using (235), the caulking operation and the bending and punching operations of the periphery of the heat shield plate (2) can be performed simultaneously by a press machine. Therefore, the workability is improved as compared with the case where the unit component plates are joined by spot welding and then bent or the like. Also, unlike the case of using the rivet, a special member (rivet) for caulking becomes unnecessary, and the number of parts can be reduced.

Further, in the above embodiment, the first to third unit component plates (21), (22), and (23) are sequentially superposed to form the three-layer heat shield plate (2). As shown in (a), the first unit component plate (26) having the caulking holes (261), (261) and (261) around it, and the second unit plate similarly having the caulking holes (271) and (271). The third unit component board (27) is obtained by assembling the unit component plates (27), (27), (27), and (27) in the same plane as shown in FIG. 28) (28) (28) (28) superimposed (see the imaginary line in (a)), the third unit component board (28) (28) (28)
The crimping projections (281) and (281) formed on (28) are inserted into the caulking holes (261) and (271) of the first and second unit component plates (26) and (27). It may be a heat shield plate (2).

[Brief description of the drawings]

FIG. 1 is a plan view of a heat shield plate (2) according to an embodiment of the present invention.

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 sectional view of a main part of the line III-III in FIG. 2;

FIG. 4 is a detailed view of a swaged portion of the first unit component plate (21) and the second unit component plate (22).

FIG. 5 is a plan view of an intermediate product before pressing the heat shield plate (2).

FIG. 6 is a side view of the heat shield plate (2) of FIG.

FIG. 7 is an enlarged view of a first unit component plate (21) and a non-joined portion of the first unit component plate (21).

FIG. 8 is an explanatory view of a modified example of the connection mode of the first to third unit component plates (26), (27), and (28).

FIG. 9 is a sectional view showing an application example of the heat shield plate (2).

FIG. 10 is an explanatory view of a conventional example.

[Explanation of symbols]

 (2) ・ ・ ・ Heat shield plate (21) ・ ・ ・ First unit component plate (22) ・ ・ ・ Second unit component plate (23) ・ ・ ・ Third unit component plate (225) (235) ・ ・・ Protrusion for caulking (216) (226) ・ ・ ・ Caulking hole

Claims (3)

[Claims] 1. A plurality of unit component plates connected so as not to form a gap as a whole when viewed from the front and back, and a connecting portion between adjacent unit component plates connects these unit component plates to each other. A heat shield that is locally bonded within a partially overlapping area. 2. The locally joined portion includes a caulking hole formed in one of the unit component plates overlapped with each other, and a portion formed by the other unit component plate overlapped with the one unit component plate. 2. The heat shield plate according to claim 1, further comprising a caulking projection formed so as to be protrudingly protruding and being caulked by being inserted into said caulking hole. 3. The heat shield plate according to claim 1, wherein the pair of unit component plates locally connected to each other are connected at one location.