KR102262479B1 - Convective circulation structure of brazing furnace - Google Patents

Abstract

An object of the present invention is to provide a convective circulation structure of a brazing furnace capable of efficient thermal convection even when heat exchangers are laminated in multiple layers or more. In the convection circulation structure of a brazing furnace for brazing a product in a furnace, the brazing furnace comprises: a conveyor on which the product is mounted, formed by a mesh belt or a chain, and transferring the product in a longitudinal direction of the brazing furnace; an external insulating wall extended in the longitudinal direction of the brazing furnace and formed in a tunnel shape in an upper portion of the conveyor; and a heater disposed in the upper portion and a lower portion of the conveyor and used as a heat source; and a blowing fan disposed inside the external insulating wall. The blowing fan allows air inside the external insulating wall to circulate in a circumferential direction of the external insulating wall.

Description

Convective circulation structure of brazing furnace

The present invention relates to brazing in which two or more metals are heated and joined at a high temperature using a filler metal, and more particularly, to a convection circulation structure of a brazing furnace in which heat treatment is performed while passing through a furnace for mass production. .

Brazing is a technology for joining two or more metals by heating them to a high temperature using a filler metal. During heating, the filler metal melts and flows into the gap between the adhered base materials, and then hardens while cooling, the principle of joining the two metals. it will be used

Brazing is performed by using a torch or passing through a furnace, and a brazing furnace is also used for mass production of heat exchangers. 1 is an exploded perspective view of a heat exchanger, in which the illustrated heat exchanger 60 forms a flow path by brazing an upper plate 61 and a lower plate 62, and supplies a ring washer 63 sealing the flow path and cooling water to the flow path. It is formed of a pipe 64 for Therefore, the heat exchanger 60 can be assembled by aligning the upper plate 61 and the lower plate 62 with the filler metal (filler material) interposed therebetween and passing the brazing furnace.

In addition, Figure 2 is a plan view of the brazing facility, Figure 3 is a front view of Figure 2. Referring to this, a general brazing facility is formed to be processed and moved along a conveyor belt formed of a mesh network, and a baking oven 10 that blows away oil and moisture as a pre-treatment step, and nitrogen to prevent oxygen from flowing into the brazing furnace It is formed of a curtain, a brazing furnace, an air cooling unit 40 for indirect air cooling of the heat-treated product, a curtain and a cooling unit 50 . And the brazing furnace uses a heater and a blower to heat the product to about 500°C in a convection method, the first heating unit 31, and a heater to heat the product to about 630°C in a radiation method. and a second heating unit (32).

In the conventional baking oven 10 or the first heating unit 31, the heater is installed in a direction surrounding the muffle outer periphery, and the blower is formed in the upper center to create an air flow in the vertical direction. Although this method has good thermal convection efficiency, there is a problem in that only the heat exchanger 60 disposed in a single layer on the conveyor belt can be heat-treated. This is because, when the heat exchanger 60 is disposed in multiple layers, there is hardly any air flow in the space formed between the heat exchangers 60, so that brazing is not performed. Therefore, the conventional convection circulation structure has a limit in mass production efficiency.

The present invention is to solve the problems of the prior art as described above, and specifically, to solve the problem that production efficiency was lowered by disposing a heat exchanger on a conveyor belt only in a single layer due to the conventional convection direction, and heat exchange in multiple layers or more. An object of the present invention is to provide a convection circulation structure of a brazing furnace capable of efficient thermal convection even when the groups are stacked.

An embodiment of the present invention provides a convection circulation structure of the brazing furnace as follows in order to solve the above problems.

The present invention relates to a convection circulation structure of a brazing furnace for brazing a product in a furnace, wherein the brazing furnace includes: a conveyor on which the product is seated, formed as a mesh belt or chain, and conveying the product in the longitudinal direction of the brazing furnace; an external insulating wall extending in the longitudinal direction of the brazing furnace and formed in a tunnel shape on the upper part of the conveyor; and a heater disposed above and below the conveyor and serving as a heat source; and a blowing fan disposed inside the outer insulating wall. Including, the blowing fan is characterized in that the air inside the external insulating wall circulates in a circumferential direction of the external insulating wall.

In addition, the inner muffle is arranged to be spaced apart from the outer insulating wall inside the outer insulating wall, the tunnel-shaped inner muffle is formed extending in the longitudinal direction of the brazing furnace from the top of the conveyor; It further comprises, characterized in that the flow path is formed between the outer insulating wall and the inner muffle.

In addition, the blowing fan is disposed between the outer insulating wall and the inner muffle, characterized in that the air circulates in the outer circumferential direction of the inner muffle.

In addition, a plurality of ventilation holes are formed through both sides of the inner muffle at different heights, and air flows into and out of the inner muffle through the plurality of ventilation holes.

Also, a jig for loading the product on the conveyor; It further includes, wherein the jig is formed to mount a plurality of products spaced apart up and down, and the blower fan circulates air between the plurality of products in a surface direction of the product.

According to the problem solving means of the present invention as described above, various effects including the following items can be expected. However, the present invention is not established only when exhibiting all of the following effects.

According to the convection circulation structure of the brazing furnace of the present invention, when the plate-shaped products are laminated and passed through the brazing furnace, air flows in the circumferential direction of the product and between the products, so that heat can be evenly conducted between the products. Therefore, higher production efficiency can be expected when compared to the conventional single-layered production by arranging the products as much as the stacking of the products.

1 is an exploded view of the heat exchanger before brazing;
2 is a plan view of the brazing facility;
3 is a front view of FIG. 2;
4 is a front view of a jig on which a heat exchanger is stacked in the present invention;
5 is a cross-sectional view of the first heating part of the brazing furnace cut in the width direction in the present invention;
6 is a cross-sectional view schematically showing an inner muffle part;
7 is a perspective view of the hook;
8 is a front view, a side view and a plan view of the latch structure;
9 is a plan view showing the latch structure and the chain and the latch structure of the latch;
10 is a front view showing the operational relationship between the chain and the hook and the latch structure;
11 is a front view for explaining the auto tension device.

Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings.

4 is a front view of the jig on which the heat exchanger is stacked in the present invention, FIG. 5 is a cross-sectional view cut in the width direction of the first heating part of the brazing furnace in the present invention, FIG. 6 is a cross-sectional view schematically showing the inner muffle part, FIG. 7 is A perspective view of the hook, FIG. 8 is a front view, a side view, and a plan view of the latch structure, FIG. 9 is a plan view showing the latch structure and the chain and the locking structure of the hook, FIG. Fig. 11 is a front view for explaining the auto tension device.

Referring to these drawings, the convection circulation structure and the chain 81 conveyor structure will be described with respect to the brazing furnace of the present invention.

First, the convection circulation structure will be described with reference to FIGS. 4 and 5 . The convection circulation structure of the present invention can be applied to the baking oven 10 as well as the first heating unit 31 for applying heat by thermal convection in the brazing furnace, but for convenience, it is a first heating unit 31 of the brazing furnace. Explain.

The first heating unit 31 is formed to be elongated in the form of a tunnel as a whole, and the housing 110 formed in the shape of a long rectangular box or tunnel is formed on the outermost side. A lower portion of the housing 110 may include a leg member for installing the furnace on the floor. The components described below may be installed and fixed to the housing 110 . A tunnel-shaped muffle 130 is formed inside the housing 110, and a conveyor for transporting the product along the brazing furnace is disposed at the lower portion of the muffle 130, and the upper portion of the muffle 130 and the lower portion of the conveyor to the product. A heater 120 may be installed as a heat source for applying heat. The heater 120 may extend along the circumference of the muffle 130 as well as the upper and lower portions of the muffle 130 .

The muffle 130 may include an outer insulating wall 131 and an inner muffle 132 disposed to be spaced apart from the inner side of the outer insulating wall 131 , and a conveyor may be installed inside the inner muffle 132 . . A nozzle for injecting an atmospheric gas such as nitrogen between the inner muffle 132 and the outer insulating wall 131 and the inner muffle 132 may be additionally installed. Since the outer insulating wall 131 and the inner muffle 132 are spaced apart in the circumferential direction, an air flow path may be formed in the spaced-apart space. In addition, a plurality of ventilation holes having different heights are formed through both sides of the inner muffle 132 , and a blower fan 140 may be installed to circulate air inside the outer insulating wall 131 . The blower fan 140 is disposed between the inner muffle 132 and the outer insulating wall 131, and is spaced apart between the inner muffle 132 and the outer insulating wall 131 and along the inside of the inner muffle 132. It can be circulated in the circumferential direction of 130 .

In this case, both ends of the inner muffle 132 may be formed as inclined surfaces with respect to the cross-section shown in the drawing for smooth air flow. Therefore, the inner muffle 132 may be formed in a shape closer to the dome than the outer insulating wall 131 . And the separation distance between the inner muffle 132 and the inner muffle 132 may be formed to be larger on both sides of the upper side than the side. Furthermore, as shown in the drawing, in order to increase the output by increasing the size of the blowing fan 140 , the blowing fan 140 may be installed on the upper outer portion of the inner muffle 132 . A flow path through which air may flow may be formed on the structure in which the blowing fan 140 is installed.

On the other hand, the product is mounted on the jig 70 on the conveyor. The jig 70 is formed so that the plate-shaped product can be mounted in multiple layers or more, as shown in FIG. 4 . In the case of the exemplary heat exchanger 60 , it is formed in a plate shape as a whole, and may be mounted on the upper jig 71 and the lower jig 72 , respectively. In this case, it is preferable that the upper jig 71 and the lower jig 72 are formed so as to be able to mount the products apart from each other. One heat exchanger 60 is mounted on the upper jig 71 and the lower jig 72, and the upper jig 71 on which the product is mounted is stacked on the lower jig 72 to easily form the multilayer jig 70. can In addition, the upper jig 71 and the lower jig 72 may be formed in the same shape.

According to the above-described configuration, air is sucked from the outer surface to the blowing fan 140 side with respect to the inner muffle 132 and flows along the upper surface, and the air descending along the opposite side from the upper surface is a ventilation hole formed in the inner muffle 132. It passes through and flows along the surface direction of the product, is discharged again through the ventilation hole, and can be sucked into the blowing fan 140 along the side. Therefore, even when the product is laminated in multiple layers, heat can be evenly applied to both sides of the product, so that the production efficiency can be doubled compared to the case in which the product is transported by a conveyor in a conventional single layer.

Next, the structure of the chain 81 conveyor will be described with reference to FIGS. 6 to 11 .

The conveyor may be formed of a chain 81 . Conveyors of conventional brazing furnaces are configured in a mesh belt rotational supply method. The chain 81 conveyor can be manufactured to be lighter than the mesh belt's own weight, thereby reducing thermal energy consumed by the conveyor.

The driving unit 80 including the chain 81 conveyor is shown in Fig. 6 or less, referring to this, the driving unit 80 is a chain 81 connected in a ring shape, and a motor for rotating and supplying the chain 81 ( 82) and the chain 81, and a sprocket 83 installed at both ends of the inner ring. And the driving unit 80 includes an auto tension device for automatically maintaining the tension of the chain (81).

The chain 81 conveyor of the present invention may consist of only the chain 81 , and may include a rope between the chains 81 . In particular, in the present invention, the conveyor can be configured to move the chain 81 forward to put the jig 70 on which the product is mounted into the brazing facility, and then to reverse the chain 81 to return it to its original position. Considering that thermal energy is accumulated and lost as much as the weight of the chain 81 , when the chain 81 is rotated in a caterpillar type, the heat accumulated in the section inside the facility is lost in the section outside the facility. However, as described above, if the chain 81 is advanced only as much as the product is put in, and then the chain 81 is moved back to the original position after input, heat loss by the chain 81 occurs only in parts A and B in FIG. 3 , so the conventional belt Compared to the total heat loss, energy can be greatly saved.

In addition, a seat 78 for seating the jig 70 is disposed on the upper surface of the chain 81 , and may include a clasp structure 73 that can be engaged between the seat 78 and the chain 81 . When the chain 81 moves forward through the latch structure 73, the jig is transferred, and when the chain 81 moves backward, the product is positioned in place and only the chain 81 can move backward.

In detail, an installation table 91 is formed on the upper surface of the chain 81 , and a plate-shaped hook 92 may be installed on the installation table 91 . On the front edge of the stopper 92 based on the conveying direction of the conveyor, latch grooves 92a may be recessed on both sides of the chain 81, which corresponds to the latch 76 formed on the mounting base 78. is the composition

A clasp 76 is formed on the seat 78 disposed on the chain 81 . In particular, as shown in FIG. 8 , the latch 76 is formed to protrude from the stopper 78 in the longitudinal direction of the stopper 74 and the stopper 74 in the thickness direction from the stopper 78 . It includes a bracket 75 and a latch 76 rotatably installed based on a latch shaft 77 formed on the bracket 75 . The clasp 76 has a round one end and is coupled to the clasp shaft 77, and the other end is a free end and may be disposed downward. Due to this structure, the clasp 76 cannot rotate toward the clasp 74, and can rotate freely in the opposite direction.

Therefore, as shown in FIG. 9, when the chain 81 is advanced, the locking groove of the locking bar 92 installed on the chain 81 and the latch 76 are engaged, and the chain 81 is driven together with the jig 70. It becomes a structure in which the loaded seat 78 can be transported together. This is also schematically shown in Fig. 10 (a), it can be seen that the mounting base 78 is dragged together by the latch groove 92a formed in the rear stopper 92a (left stopper in the drawing). In addition, when the chain 81 is moved backward as shown in Fig. 10 (b), the seat 78 and the chain 81 are separated, and then the rear edge of the front stopper 92b (right stopper in the drawing) is the latch 76. While pushing and rotating, only the chain 81 can be returned to its original position while the seat 78 is positioned in its original position. At this time, the mounting table 78 can be supported at both edges by rollers as shown in FIG. 6 , and the mounting table 78 repeats forward and stop according to the reciprocating driving of the chain 81 .

In addition, stoppers 93 may be formed extending downwardly at both edges of the stopper 92 . By providing the stopper 93, even if the jig 70 is mounted to one side with respect to the chain 81, it is possible to prevent the mounting base 78 from being excessively tilted. In addition, the stopper 93 may be formed in a shape similar to an inverted triangular shape in which the lower vertex is rounded when viewed from the side, which reduces the contact surface even if the stopper 93 comes into contact with the iron plate installed at the bottom when the conveyor is driven. is to reduce

Next, an auto tension device included in the driving unit 80 will be described with reference to FIG. 11 . The auto tension device is configured to automatically adjust the tension of the chain 81 , and includes a cylinder 84 . The cylinder 84 is formed to be stretchable in response to a set force or pressure, and at one end of the cylinder 84, a sprocket 83 for rotating the chain 81 is fixed, and the other end can be fixedly installed in the facility. have. The cylinder 84 is installed and controlled so that a certain force or pressure is applied, and this force or pressure is preferably set to an extent capable of maintaining the optimum tension of the chain 81 . In addition, the sprocket 83 may be installed to move along the rail 85 . The rail 85 is formed at the central height of the conveyor in consideration of the installation position of the sprocket 83, and is preferably formed to extend along the conveying direction. Further including a sensor for detecting the pressure or cylinder 84 length inside the cylinder 84, when the cylinder 84 is elongated more than a set length, the sensor detects it and stops the facility or the set pressure of the cylinder 84 can generate an alarm signal to readjust the

Therefore, as shown in FIG. 11, in the conventional case, when the chain 81 is loosened and the elasticity is lowered, there is a problem that the sprocket 83 and the chain 81 are separated (indicated by a dotted line), but in the present invention, the cylinder 84 is a sprocket ( 83) is pushed along the rail 85 to maintain the set pressure, so that the tension of the chain 81 can be maintained at a desired level. Therefore, there is an effect of reducing the effort of maintenance.

In the present specification, each configuration has been described separately, but embodiments that can be derived by combining some configurations also fall within the scope of the present invention.

The above description is merely illustrative of the technical idea of the present invention, and those of ordinary skill in the art to which the present invention pertains can make various modifications and variations without departing from the essential characteristics of the present invention. The scope of protection should be construed by the following claims, and all technical ideas within the equivalent range should be construed as being included in the scope of the present invention.

10 Baking Oven 20 Curtain
30 Brazing Furnace 31 1st Heating Unit
32 Second heating unit 40 Air cooling unit
50 cooling unit 60 heat exchanger
61 upper plate 62 lower plate
63 ring washer 64 pipe
70 Jig 71 Upper Jig
72 lower jig 73 clasp structure
74 catch plate 75 bracket
76 clasp 77 clasp shaft
78 Seat 80 Drive
81 chain 82 motor
83 sprocket 84 cylinder
85 Rail 91 Mount
92 clasp 92a clasp groove
93 Stopper 110 Housing
120 Heater 130 Muffle
131 Outer insulation wall 132 Inner muffle
140 Blowing fan

Claims (5)

In the convection circulation structure of a brazing furnace for brazing a product in the furnace,
The brazing furnace,
a conveyor on which the product is seated, formed as a mesh belt or chain, and conveying the product in the longitudinal direction of the brazing furnace;
an external insulating wall extending in the longitudinal direction of the brazing furnace and formed in a tunnel shape on the upper part of the conveyor; and
a tunnel-shaped inner muffle disposed inside the outer insulation wall to be spaced apart from the outer insulation wall, extending from the upper part of the conveyor in the longitudinal direction of the brazing furnace, and having an inclined surface such that the inner width becomes narrower toward the upper portion;
Including, including a flow path extending in the longitudinal direction of the conveyor between the outer insulating wall and the inner muffle,
a heater disposed above and below the conveyor and serving as a heat source; and
a blowing fan disposed inside the outer insulating wall;
including,
A plurality of ventilation holes are formed through both sides of the inner muffle at different heights,
The blower fan circulates the air inside the external insulating wall in the circumferential direction of the external insulating wall in the flow path so that the air enters and exits the internal muffle through the ventilation hole Convection circulation structure of a brazing furnace .
delete According to claim 1,
The blowing fan is disposed between the outer insulating wall and the inner muffle, the convection circulation structure of the brazing furnace, characterized in that the air circulates in the outer circumferential direction of the inner muffle.
delete 4. The method of claim 1 or 3,
a jig for loading the product on the conveyor;
further comprising,
The jig is formed to mount a plurality of products by vertically spaced apart from each other,
The blower fan is a convection circulation structure of a brazing furnace, characterized in that it circulates air between the plurality of products in the surface direction of the products.

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