JPH0723807B2 - Combustion device - Google Patents

Description

TECHNICAL FIELD The present invention relates to the configuration of a combustion chamber such as a gas warmer used in a general household.

2. Description of the Related Art Conventionally, the composition of a combustion chamber of a gas warmer is a combination of sheet metal members, and the joint between members is spot welded or screwed by screws, and both the primary combustion chamber and the secondary combustion chamber , Both ends were fixed by the same joining method.

An embodiment of the structure of the above-described conventional combustion chamber will be described below with reference to the drawings. FIG. 10 is a vertical cutting side view showing an example of a conventional warm air heater, and FIG. 11 is a horizontal cutting front view. An air inlet 2 having one end opened to the outside is provided in the instrument body 1, and a warm air outlet 3 is provided at the other end. The air intake 2 has a filter 4, and the warm air outlet 3 has a louver 5. An air passage 6 is provided in the instrument body 1 so that the air intake 2 and the warm air outlet 3 communicate with each other.
A circulation fan 8 which is rotated by a motor 7 is located inside, and the rotation of this circulation fan 8 causes air sucked from the air intake 2 to flow as indicated by an arrow, and a burner 10 in the first combustion chamber 9 , The fuel is burned, the heat generated in the second combustion chamber 11 is diffused, and the hot air is discharged from the hot air outlet 3. The second combustion chamber 11 was composed of guide plates 12, 13, 14 and was screwed or spot welded to the side plates 15, 16. Similarly, the combustion case 17 constituting the first combustion chamber 9 is also fixed to the side plates 15 and 16 on both sides, like the guide plates 12, 13 and 14.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in the method of constructing the combustion chamber of the hot-air heater having such a configuration, screw joining or spot joining is the mainstream, and the production efficiency in the manufacturing process is low and the cost is high. . Further, since the burner 10 burns in the first combustion chamber 9, the combustion case 17 constituting the burner 10 is made of stainless steel, and the spot welding of the side plate with low heat to the surface-treated steel plate is performed by combining different metals. However, it is usually not so preferable, and strength control after spot welding was difficult. There is a difference between the expansion due to the lateral thermal expansion of the combustion case 17, which becomes even higher in temperature, and the expansion due to the thermal expansion of the guide plates 12, 13, 14 at a relatively normal temperature, and the difference in thermal strain after combustion is stopped. When it contracted, it was distorted and it was easy to generate unpleasant sounds.

Means for Solving the Problems In order to solve the above problems, the combustion apparatus of the present invention is provided with a plurality of slit holes in both left and right side plates and at both ends of a plurality of guide plates constituting the second combustion chamber. A plurality of protruding pieces each having a U-shaped slit-shaped notch and a protruding portion on the neck on both sides of the tip are fitted into the slit holes at the central portion of the tapered convex surface, and then protruded after the fitting. The U-shaped slit-shaped notch at the tip of the protruding piece is expanded into a V-shape and spread out like a slit, the convex portion is crimped and fixed in the slit hole, and is conventionally fixed to both side plates. (1) The combustion case that constitutes one combustion chamber is fixed to only one side plate, the other end is supported through a through hole provided in the other side plate so as to have a cantilever support structure, and one side is free. Is.

Action The present invention, by configuring the combustion chamber with the above configuration,
It becomes possible to caulk multiple independent guide plates from both sides at the same time, improving productivity and reducing machining costs. In addition, the first burner burns to a high temperature
Since the combustion case that constitutes the combustion chamber is fixed on one side and free on the other side, thermal strain can be released freely.
Since the guide plate has a degree of freedom irrespective of the caulking of the plurality of guide plates, the distortion noise at the time of expansion / contraction can be largely eliminated.

Example Hereinafter, a combustion chamber according to an example of the present invention will be described with reference to the drawings. FIG. 1 is a side view of vertical cutting in one embodiment of the present invention, and FIG. 2 is a front view of horizontal cutting. An air intake 20 is provided in the instrument body 18 via a filter 19, and communicates with it to form a first combustion chamber 21 and a second combustion chamber 22, and a burner 23 is housed in the first combustion chamber 21. To go down. Burner
The heat obtained by the combustion of 23 is sucked from the air intake 20 by the circulation fan 26 driven by the motor 25, exchanges heat with the air flowing as shown by the arrow, passes through the hot air outlet 27, and enters the room from the louver 28 to the room. Blown. The second combustion chamber 22 has a plurality of
The rear and front guide plates 29, 30, 31 and the left and right side plates 34, 35 are provided, and the first combustion chamber 21 has a U-shaped combustion case 32.
And the combustion case side plate 3 that closes the open end of one of them
3 and side plate 34. The air passage 24 in the instrument body 18 connecting the air intake 20 and the hot air outlet 27 is
Side plates 34, 35 for inserting and crimping the guide plates 29, 30, 31
It is configured by utilizing the space between the guide plate 31 and the front heat shield plate 36 which is fixed by using the flange portion of.

3 to 9 show a concrete embodiment for forming the first combustion chamber 21 and the second combustion chamber 22. A plurality of slit holes 37 are provided at predetermined positions in the left and right side plates 34, 35, and further, outer peripheral flange portions 34a, 35a except the lower sides of the side plates 34, 35.
In this case, a plurality of cut-and-raised protruding pieces 38 are projected. The upper, rear, and front guide plates 29, 30, 31 that constitute the second combustion chamber 22
A plurality of projecting pieces 39 that are fitted into the slit holes 37 of the side plates 34 and 35 are provided at both side ends of each of the side plates 34 and 35.
It is designed to fit in. However, since the protruding piece 39 is not securely fixed in this state, as shown in FIG. 6 and FIG. 7, the jig is attached to the U-shaped slit-shaped notch 39a provided in the protruding piece 39 which is fitted and protruded. Is inserted, the protruding piece 39 is pushed and expanded so as to be cut, and the outer end surface of the protruding piece 39 is pressed against the end surfaces of the slit holes 37 of the side plates 34, 35 to be fixed by being bitten. In addition, slit holes 3 provided in the side plates 34, 35
7 has a tapered convex portion 37a in the inserting direction as shown in FIGS. 4 and 5 for facilitating the fitting when the projecting pieces 39 at both ends of the guide plates 29, 30, 31 are fitted. , The guide plate 29 to be fitted,
As shown in the figure, U-shaped slit-shaped notches 39a at the center of the tip and protrusions 3 on both sides of the protrusions 39 at both ends of 30, 31 are shown.
9b, the convex portion 39b is made slightly larger than the size of the slit hole 38, and the convex portion 39b is caught and has a retaining function after being fitted into the slit hole 38 at one end. Furthermore, the front heat shield plate 36 has square holes 40 at both end portions, and the cut and raised protrusions 38 provided on the outer peripheral flange portions 34a, 35a of the side plates 34, 35 are inserted and folded. It is bent and fixed. 8 and 9 show a method for fixing the front heat shield plate 36.

On the other hand, the one end opening of the combustion case 32 forming the first combustion chamber 21 is joined to the side plate 34 with screws using the fixing holes 41a and 41b. In this case, the method of joining the combustion case 32 and the side plate 34 may be the same as the method of joining the slit hole 37 and the projecting piece 39 described above. The other end opening of the combustion case 32 is closed by a combustion case side plate 33. Further, the first combustion chamber 21 can be fixed on one side and free on one side by supporting the part of the combustion case 32 on the closed side through the through hole 42 formed in the side plate 35. Therefore, the lateral width L ₁ of the first combustion chamber 21, the lateral width L ₂ of the second combustion chamber 22 need to be as becomes L _1> L _2.

It should be noted that an operation of fitting a plurality of projecting pieces 39 at both side ends of the upper, rear, and front guide plates 29, 30, 31 into the slit holes 37 provided in the side plates 34, 35, and a tip portion of the projecting piece 39. Since a jig is applied to the notch 39a and pressure is applied to the notch 39a, the notch 39a is expanded in a V shape as shown in FIG. , Notches on all protrusions 39
The tearing and expanding work of 39a can be performed at the same time. As shown in FIG. 8 and FIG. 9, the front heat shield plate 36 and the cut-and-raised protruding pieces 38 on the outer peripheral flange portions 34a, 35a of the side plates 34, 35 are not bent at one place at a time, but at all at the same time. The caulking work is performed.

Effects of the Invention As described above, according to the present invention, the following effects can be obtained.

(1) It is possible to perform a working operation in which a plurality of independent sheet metal members are crimped from both sides at the same time, which greatly reduces the man-hours and the processing cost.

(2) In the combustion chamber, the part that expands and contracts due to thermal expansion due to high temperature is free on one side, so it is possible to prevent applying force that causes thermal deformation to the entire combustion chamber, Distorted sound can be prevented.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view of a combustion apparatus according to an embodiment of the present invention, and FIG. 2 is a horizontal sectional front view of the same. FIG. 3 is an exploded perspective view of the same combustion chamber constituent member, and FIG. 4 is a sectional view showing a state in which a projecting piece of a guide plate is fitted in a slit hole of the side plate of the same combustion chamber.
4 is a side sectional view of FIG. 4, FIG. 6 is a sectional view of FIG. 4 in a state of being caulked, and FIG. 7 is a side sectional view of FIG. FIG. 8 is an assembled cross-sectional view of the cut-and-raised protruding piece of the flange portion of the combustion chamber side plate and the square hole of the front heat shield plate, and FIG. 9 is a cross-sectional view showing FIG. 8 after bending. FIG. 10 is a vertical cutting side view showing a conventional example, and FIG. 11 is a horizontal cutting front view thereof. 21 …… First combustion chamber, 22 …… Second combustion chamber, 29 …… Upper guide plate, 30 …… Rear guide plate, 31 …… Front guide plate, 32 …… Combustion case, 34,35 …… Side plates, 37 …… slit hole, 39 …… projection piece, 42 …… through hole.

Claims (1)

[Claims] 1. An open one end of a combustion case having a substantially U-shaped vertical cross section, which forms a first combustion chamber and has only one of the upper side and the left and right sides opened and the other closed, is fixed to one of the left and right side plates. In addition, the closed other end of the combustion case is passed through and supported by a through hole provided in the other of the left and right side plates, and the combustion case is enclosed and both ends are attached to the left and right side plates for the second combustion. A plurality of guide plates that form a chamber are provided, and a plurality of projecting pieces having a U-shaped slit-shaped notch formed at both end portions of the guide plate and convex portions at neck portions on both sides of the guide plate are provided. Insert it into the slit hole at the center of the plurality of tapered convex surfaces provided at predetermined positions on the left and right side plates,
A combustion device in which the notch of the projecting piece is expanded into a V-shape and the convex is pressed against the end surface of the slit hole and fixed.