JP3493142B2 - How to reinforce the can body of a heat exchanger - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for reinforcing a can body of a heat exchanger, and more particularly to a method for reinforcing a flange portion of a tubular can body that accommodates a plurality of water pipes having heat exchange fin groups. It is a thing.

[0002]

2. Description of the Related Art In a heat exchanger such as a water heater, a plurality of endothermic water pipes having a group of heat exchange fins are inserted into one open end of a copper plate-shaped rectangular can body and these are externally connected to the can body. Take the configuration that communicates. The downstream ends of these endothermic water pipes are connected to a hot water outlet circuit outside the can body, and the upstream ends thereof are connected to a preliminary endothermic pipe wound around the can body.

For this reason, a minimum radius of curvature is required to bend the preheat absorption tube so that its cross section is not crushed. Therefore, the preheat absorption tube is wound tightly around the body of the can. Therefore, the corner portion of the body portion of the can is finished to have an arc-shaped cross section. Further, since a burner box, an exhaust pipe, and the like are connected to both ends of the can body having the above-described structure, flange portions projecting outward are provided in order to ensure airtightness with these parts.

However, in order to ensure the airtightness, it is necessary to uniformly adhere the entire flange portion to the mating side, so that a certain degree of rigidity is required. However, since the plate thickness of the can body is set to be thin from the viewpoint of heat exchange efficiency and cost reduction, combined with the fact that it is made of a copper plate and is soft as described above, the rigidity of the flange portion is insufficient. there were. Therefore, conventionally, the back surface of the flange portion is
Bend the blank shape as shown in 3 (L)
(L) is bent to form an outer portion as a skirt portion for reinforcement, and a reinforcing plate formed in an L shape as a whole is used in combination, and is attached and fixed to the back surface of the flange portion.

As the conventional reinforcing plate, there is used one which is press-molded in advance into an L-shape so as to fit the corner portion of the can body. This is because it is possible to reliably reinforce the base end portion to the peripheral edge portion of the flange so that almost the entire area of the flange portion can be reliably attached to the mating side. When manufacturing the reinforcing plate, a blank is punched out from the plate material and then press-molded, resulting in a large material loss and a high manufacturing cost. In the manufacturing process as well, the blank shape is L-shaped, and the blanks between the blanks are increased because the blank shape is finished in the final shape after being plate-cut in the manner shown in FIG. There's a problem.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and a flange portion is projected from one end of a rectangular tubular body portion, and a corner portion of the body portion continues from the flange portion. In a method of reinforcing the flange portion of a can body of a heat exchanger formed in an arcuate curved surface with a separate reinforcing plate, a curved linear band member can be attached to an arcuate corner portion. It is an object of the present invention to make it possible to reinforce the flange portion.

[0007]

[Means for solving the problem]. The solution means of the first invention taken to solve the above-mentioned problem is, "When the reinforcing plate is attached and fixed along the flange portion so as to be wrapped around the body portion, the reinforcing plate as a whole is A straight band-shaped plate material, and a plurality of notches that expand toward one side edge of the plate material in a portion corresponding to the corner portion are continuous at predetermined intervals in the longitudinal direction of the band-shaped plate material, By bending the notch forming region in conformity with the corner portion, the reinforcing plate is caused to follow the body portion. "

The above-mentioned solving means operates as follows. Since the reinforcing plate as a whole is made of a linear strip-shaped plate material, this plate material can be manufactured from a strip-shaped material having a predetermined width. By forming the cutout portion in a predetermined manner on the plate material, the cutout portion forming region can be bent along with the corner portion of the body portion of the can body. For example, this plate material may be a molding material in which a strip-shaped material made of a thin metal plate is bent into a U-shaped cross section. In the case of this molding material, there are skirt portions on both sides of the cross section, and the notch portion of the portion corresponding to the corner portion is opened in the range from the base end portion of one skirt portion to the end edge of the other skirt portion. Need to be formed. In this case, the skirt portion remains on both the inner peripheral side and the outer peripheral side in a state where the notch forming region is bent in an arc shape. Therefore, in the state where the reinforcing plate having the skirt portion is additionally attached to and fixed to the flange portion, even if the reinforcing plate is made of a thin plate, the skirt portions have rigidity against a load in a direction perpendicular to the plane of the flange portion. Becomes higher.

Even if the reinforcing plate is a strip-shaped plate material having a length corresponding to one turn of the body portion of a rectangular tube-shaped can body, it is L-shaped or U-shaped along the adjacent side of the rectangular tube cross section. 2 strips of plate material
It may be a combination of two. ． The solution of the second invention taken to solve the above-mentioned problem is "a reinforcing method using the reinforcing plate manufactured from a plate member made of a linear belt as a whole, and a part corresponding to the corner portion is provided. Is formed so that a plurality of notches that are open to one side of the plate material and expand toward the one side are continuous at a predetermined interval in the longitudinal direction of the plate material, and the other side of the portion corresponding to the corner portion is formed. A plurality of connecting tongues for connecting adjacent members of the cutouts are continuously formed in the longitudinal direction, and the plurality of connecting tongues are folded inward in a state where the cutout forming region is bent. By crimping the plate material at the portion corresponding to the corner portion to the reinforcing plate configured to be bent in an arc shape in a direction along the plane of the plate material, and the previously bent reinforcing plate to the flange portion. It is attached and fixed ”.

Also by this solving means, since the reinforcing plate can be manufactured by the linear plate member, material loss does not occur as in the first invention. In this case, the notch forming area of the linear plate material corresponds to the corner portion,
The bent portion is bent to have a predetermined curvature, and the bent portion is fixed in an arc shape by crimping the outer portion of the bent portion. It just needs to be attached directly to the flange.

In this case, since a pre-bent one is made to correspond to the can body, two L-shaped or U-shaped strip-shaped plate members along adjacent sides of a rectangular cross section are combined to form one roll. Workability is better when the structure is attached and fixed. Also in the second aspect of the invention, the plate member may be a thin plate member having a U-shaped cross section and having skirt portions on both sides.
In this case, the connecting tongue outside the bent portion is formed from the material of the portion corresponding to the outer skirt. The skirt portion is continuously formed at the inner end of the adjacent member sandwiched by the notches so that the skirt remains.

[0012]

The present invention, having the above-mentioned structure, has the following unique effects. Since the reinforcing plate arranged along the corner portion of the can body can be manufactured by a linear plate material, there is almost no material loss as in the conventional case. In the first invention,
In addition to the above-mentioned effect, since the portion corresponding to the corner portion can be manually bent when wound along with the can body, it is not necessary to separately mechanize this bending step, and the configuration can be simplified.

According to the second aspect of the invention, in addition to the above-mentioned effect, since the portion along the corner portion is bent in advance by the caulking work, it is easy to attach and fix the flange portion.
There is an advantage.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. The heat exchanger shown in FIGS. 1 to 3 is a heat exchanger used in a water heater, and flange portions (11) and (12) project from the upper and lower ends of a rectangular tubular can body (1). Then, the reinforcing plate (2a) is provided on the lower surface of the flange portion (11).
However, the reinforcing plate (2b) is attached and fixed to the upper surface of the flange portion (12).

The flange portion (11) reinforced by the reinforcing plate (2a) is attached in such a manner as to be in close contact with the exhaust top (T) continuously provided above the can body (1) of the heat exchanger, Can body
(1) and the exhaust top (T) are connected, and similarly connected to the burner box (B) which is continuously provided below by the flange portion (12) reinforced by the reinforcing plate (2b). [First Embodiment] As shown in FIG. 2, a large number of fins (F) (F) are juxtaposed in a certain range from the upper end of the can body (1), and a heat absorbing pipe ( 13) (13) is inserted. Then, the preliminary heat absorption pipe (14) connected to this is wound around the body of the can body (1) in the range from the vicinity of the lower flange portion (12) to the lower end of the heat absorption pipes (13) (13). To be

For the reason described above, as shown in FIG. 3, in the can body portion of this portion, the corner portion (15) is formed into an arcuate curved surface of a certain size, and the flange portion (12) is also formed. The shape follows this. The planar shape of the reinforcing plate (2b) attached to the flange portion (12) is the same as the flange portion (1
It is configured to almost match that of 2).

Moreover, the reinforcing plate (2b) is first manufactured by punching a strip blank that fits within a certain width. As shown in FIG. 4, this blank has a straight line corresponding portion (21) corresponding to the long side of the cross section of the can body (1) and a plurality of cutout portions (22) (22) corresponding to the corner portions. The cutout forming area (the bent portion (23)), the first short side portion (24) corresponding to a part of the short side of the cross section of the can body (1), and the second short side corresponding to the other portion. Side (2
5) consists of

Then, when both side edges of this blank are bent along the bending lines (L) (L), the reinforcing plate (2b) is formed with skirts (26) (26) as shown in FIG. In this example, five notches (22) (22) are formed, and a portion corresponding to the skirts (26) (26) is provided on each of the outside and the inside of each notch (22). And outer skirt (26)
The rising portion (261) corresponding to
1), the skirt portion (26) outside the first short side portion (24) and the second short side portion (25) is continuous.

When the bent portion (23) is bent, as shown in FIGS. 6 and 7, the inner rising portions (262) (262) are densely continuous and the inner peripheral side is the can body (1). The reinforcing plate half body (20) is finished to have a curvature that matches the corner portion. Can body (1)
A pair of reinforcing plate halves bent so as to be wrapped around the body of the body (20)
(20) as shown in FIG. 8, the first short side portion (24) and the second short side portion (2
5) so that they face each other, and the tongue piece (27) at the tip of the first short side portion (24) is overlapped and connected so as to be along the end portion (28) of the second short side portion (25). To form a rectangular frame body, which is attached to the upper surface of the flange portion (12) of the can body (1) for use.

In this example, the reinforcing plate (2b) is fixed along the upper surface of the flange portion (12) by spot welding. Then, the locking tongue pieces (29) and (29) provided on the outer skirt portion (26) of the reinforcing plate (2b) are connected to the burner box (B) continuously below the can body (1). The burner box (B) is connected to the can body (1) by bending and crimping together with the crimping tongue provided on the. Also, a reinforcing plate (2a) made in the same manner is used for the upper flange portion (11) as well, and the exhaust top is
(T) is made in a similar way. (See FIG. 1) In the case of this example, the blank consisting of the straight line corresponding portion (21) and the portions corresponding to the first short side portion (24) and the second short side portion (25) is linear as shown in FIG. Therefore, this blank can be punched from the material in a state of being arranged side by side in the width direction of the blank. Therefore, as compared with the conventional case where a blank bent into an L shape is punched from the material, The taking efficiency (yield of material) is increased. In other words, the loss of scrap is greatly reduced. By the way, the material yield increased by 25% in the case of manufacturing our similar reinforcing plate.

[Second Embodiment] In this example, as shown in FIG. 11, a reinforcing plate half body (20) is combined to form a reinforcing plate (2b). The reinforcing plate half body (20) is punched into a linear blank having a shape as shown in FIG. 9 showing a blank shape and FIG. 10 showing an enlarged view of a main part thereof. This blank consists of a straight line corresponding part (21), a first short side part (24) and a second short side part.
A notch portion that opens to one side between (25) as in the first embodiment
(22) (22) is a group formed, this notch (22) (22)
On the other side, the adjacent tongues (31) and (31) are connected to each other by the connecting tongues (3) and (3) sandwiching the cutout portion (22).

The blank formed as described above is bent into a bending line.
(L) It is bent by (L) and molded into a U-shaped cross section, and thereafter, the connecting tongues (3) and (3) are located outside in the cutout forming region,
The connecting tongue piece (3) that is bent so that the adjacent members (31) (31) are in close contact with each other and is continuous with the skirt portion (26).
By crimping so as to be folded inward, the notch forming region is fixed in the bent state where the adjacent members (31) (31) are in close contact with each other.

Reinforcement plate halves (20) (20) manufactured in this way
When the end portions (28) and the tongue pieces (27) are overlapped and spot-welded to the flange portion (12) by fitting them to the body portion of the can body (1) so that they face each other in the opposite posture, Similarly, the flange part (1
It is attached and fixed to 2). Also in this case, the can body (1)
Inside the reinforcing plate (2b) corresponding to the corner of the can body, there is a rising part (262) continuing to the inside of the adjacent members (31) (31).
The state is along the trunk of (1), and the portion corresponding to this corner portion has increased rigidity by this rising portion (262) and the connecting tongue piece (3) folded as described above.

In these examples, the radius of the corner portion is set to about 15 mm, but the radius of the corner portion of the upper reinforcing plate (2a) is very small. The exhaust top (T) is connected (coupled) to the upper flange portion (11) in the same manner by using the reinforcing plate (2a) manufactured in the same manner. Since the radius of the corner portion of the body portion where the reinforcing plate (2a) is mounted is very small, it remains between the open ends of the cutout portions (22) and (22) as shown in FIG. The member is a triangular tongue (221).
(221) (221) When they are bent so that they are in close contact with each other, they can be bent with a very small curvature. In this case, the outer rising portion (261) of the bent portion (23) is the same as the straight line corresponding portion (21).
The short side portion (24) serves as a connecting portion with the second short side portion (25).

[Brief description of drawings]

FIG. 1 is a side view of a can body (1) according to an embodiment of the present invention.

[Figure 2] Plan view

FIG. 3 is a transverse end view of the can body (1).

FIG. 4 shows the reinforcing plate half body (2) of the first embodiment (first invention).
0) Illustration of blank shape in manufacturing process

FIG. 5 is an explanatory view of a bent and molded state of the reinforcing plate (2b).

FIG. 6 is a plan view showing a state in which the reinforcing plate half body (20) is bent along the body of the can body (1).

[Figure 7] Side view

FIG. 8: Can body with a pair of reinforcing plate halves (20) (20) combined
Explanatory drawing of the state wrapped around the body of (1)

FIG. 9 is a reinforcing plate half body (2) of the second embodiment (second invention).
An explanatory view showing a blank shape in the production of (0)

FIG. 10 is an enlarged view of the bent portion (23) having the blank shape.

FIG. 11 is a plan view of the reinforcing plate half body (20).

FIG. 12 is a plan view of another example of the linear reinforcing plate half body (20).

FIG. 13 is an explanatory diagram of a conventional example.

[Explanation of symbols]

(1): Can, (11) (12): Flange, (13): Endothermic tube, (1
4): Preheat absorption tube (15): Corner, (2a) (2b): Reinforcement plate, (20): Reinforcement plate half, (21): Straight line corresponding part (22): Notch, (221): Triangular tongue, (23) Bending part, (2
4): first short side portion (25): second short side portion, (26): skirt portion, (261) (262): rising portion, (27): tongue piece, (28): end portion, ( 29): Locking tongue (3): Connecting tongue, (31): Adjacent member, (T): Exhaust top,
(B): Burner box (F): Fin, (L): Bending line (Note that the same symbols in the drawings indicate the same or corresponding parts.)

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-6-11192 (JP, A) JP-A-60-243493 (JP, A) Actually open 2-106544 (JP, U) Actually open 63- 14088 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) F24H 9/00

Claims (2)

(57) [Claims] 1. A flange portion in a can body of a heat exchanger in which a flange portion is projected from one end of a rectangular tubular body portion, and a corner portion of the body portion near the flange portion is formed into an arcuate curved surface. In the method of reinforcing by a separate reinforcing plate, when additionally fixing the reinforcing plate along the flange portion so as to be wound around the body portion, the reinforcing plate is composed of a linear strip-shaped plate material as a whole, In addition, a plurality of cutout portions that expand toward one side edge of the plate material are formed in the portion corresponding to the corner portion so as to be continuous at predetermined intervals in the longitudinal direction of the strip-shaped plate material, and the cutout portion forming area A method of reinforcing a can body of a heat exchanger, characterized in that the reinforcing plate is caused to bend along the corner portion so as to be along the body portion. 2. A flange portion in a can body of a heat exchanger in which a flange portion projects from one end of a rectangular tubular body portion, and a corner portion of the body portion near the flange portion is formed into an arcuate curved surface. In the method of reinforcing by a separate reinforcing plate, a reinforcing method using the reinforcing plate manufactured from a plate material made of a linear belt as a whole, the portion corresponding to the corner portion, on one side of the plate material. A plurality of notches that are open and expand toward the one side are formed so as to be continuous at a predetermined interval in the longitudinal direction of the plate material, and the notches are adjacent to the other side of the portion corresponding to the corner portion. A plurality of connecting tongues for connecting members are continuously formed in the longitudinal direction, and the plate member is formed by crimping the plurality of connecting tongues inward in a state where the notch forming region is bent. Part corresponding to the corner At the reinforcing plate having a configuration curved in an arc shape in a direction along the plane of the plate material, wherein the curved reinforcing plate is attached and fixed to the flange portion in advance, How to reinforce the can body.