KR101532746B1 - A heat exchanging apparatus of pre-heater for vehicle - Google Patents

Abstract

Provided is a heat exchange device for a preheater of a vehicle having an outer tank (20) and an inner tank (10) inserted in the outer tank (10) while having a heat transfer unit (1). According to the present invention, the heat exchange device for a preheater of a vehicle comprises: an upper guide ring (120) fixed on the inner surface of the upper part of the inner tank (10); a lower guide ring (180) fixed on the inner surface of the lower part of the inner tank (10); first and second intermediate guide rings (140, 160) positioned between the upper guide ring (120) and the lower guide ring (160); a first heat transfer fin (130) installed between the upper guide ring (120) and the first intermediate guide ring (140); a second heat transfer fin (150) installed between the first intermediate guide ring (140) and the second intermediate guide ring (160); and a third heat transfer fin (170) installed between the second intermediate guide ring (160) and the lower guide ring (180). The present invention can be easily manufactured and can transfer heat effectively absorbed from high temperature combustion gas to cooling water.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a pre-

The present invention relates to a preheater heat exchanger for a vehicle, and more particularly, to a preheater heat exchanger for a vehicle that efficiently guides and discharges combustion gas flowing into a combustion chamber in an inner cylinder to efficiently discharge hot water circulating between the inner- To a preheater heat exchanger for a vehicle.

Generally, the indoor heating of a vehicle is possible only after a certain period of time has elapsed after the driver starts the vehicle by boarding the vehicle. This is because the heating device for heating the interior of the vehicle uses the heat generated during the operation of the engine. Therefore, in a vehicle using a diesel engine such as a bus, a battery mounted on the vehicle is used as a power source, and a preheater is installed as a kind of vehicle boiler for burning fuel.

The preheater is supplied with power from the battery when the engine coolant temperature is below a certain temperature (typically about 65 ° C) when the engine is running and the heater switch is turned on. The coolant of the vehicle is rapidly heated to be used for heating. And is automatically turned off when the temperature of the engine rises above a certain temperature (usually about 75 ° C) due to heat generated by the engine.

Fig. 4 shows a typical example of a conventional preheater. As shown in the drawing, the preheater basically comprises a combustion device and a heat exchanger. In the combustion device, a drive motor 13, an ignition device 11, a fuel pump 15 and a diffusion plate 20 are provided do. The heat exchanger is provided with an outer cylinder 12 and an inner cylinder 22. The inner space of the inner cylinder 22 functions as a combustion chamber and heat transfer means and a coolant guide 22a are provided on the inner and outer surfaces, respectively. A brief overview of the process of preheating the coolant using a preheater is presented.

When the driving motor 13 is operated, the outside air is sucked and vortexed by the plurality of vortex pieces 21 formed on the diffusion plate 20 and transferred to the inside of the combustion chamber. At the same time, the fuel is compressed to a high pressure by the fuel pump 15 and then passes through the injection nozzle 19 having a fine through-hole to be atomized. When current is applied to the ignition device 11 at this time, The high voltage is discharged to burn the fuel, and the combusted gas flows into the combustion chamber of the inner cylinder 22. [

The combustion gas introduced into the inner cylinder 22 in the direction of the central axis of the combustion chamber flows backward at the lower end of the inner cylinder and moves along the heat transfer means provided on the inner cylinder inner surface. . Meanwhile, the cooling water is filled between the inner and outer passages. In the course of the backward flow of the combustion gas along the heat transfer means, the heat is naturally transferred to the cooling water, and the heated cooling water is guided and discharged by the cooling water guide 22a, .

A typical example of heat transfer means as a medium for guiding the movement of the conventional combustion gas and transferring heat to the cooling water is shown in Fig. As shown in the drawing, the conventional heat transfer means is composed of a plurality of heat dissipating fin structures which are vertically provided on the inner surface of the inner tube, but are spaced apart from each other by a predetermined distance. The radiating fin structure may be realized by repeatedly folding a single plate material into an integral type or by making individual radiating fins and then spacing them apart. However, even if the heat dissipation fin structure is implemented in any manner, finally, they are welded to the inner surface of the inner tube, which causes some problems.

According to the conventional method, the rear surface of each radiating fin must be individually welded to the inner surface of the inner tube. In this case, the manufacturing cost is increased, and the manufacturing process is so troublesome that the productivity is significantly reduced. In addition, when the radiating fin is welded to the inner surface of the inner tube, the welding parts of the radiating fin and the inner tube inner surface are damaged by the high-temperature combustion gas, and the heat transfer efficiency through the radiating fin is reduced. Considering the fact that each radiating fin must be individually welded and joined to the inner surface of the inner tube, the overall heat transfer efficiency can not but be lowered.

Further, in the conventional heat radiating fin structure, each radiating fin is integrally connected from the lower end to the upper end of the inner cylinder. In this case, since the combustion gas moves instantaneously between adjacent radiating fins, the heat transfer time to the radiating fin is very short none. In this case, since the radiating fins can not properly absorb heat from the high-temperature combustion gas, a phenomenon occurs in which more fuel is consumed in order to heat the cooling water to a certain temperature or more.

Korean Utility Model No. 0139996, Korean Patent No. 0405483, Korean Patent No. 0536379

SUMMARY OF THE INVENTION The present invention has been made in order to solve the problems of the prior art as described above, and it is an object of the present invention to provide a heat transfer means which is easy to manufacture and can effectively absorb heat from a high- .

In order to achieve the above object, the present invention provides an air conditioner comprising an outer cylinder (20) having a cooling water inlet (22) at one side and a cooling water outlet (26) at the other side, A preheater heat exchanger for a vehicle comprising a guide (16) and an inner cylinder (10) provided with a combustion gas inlet (12) and a combustion gas outlet (14) opened at one side and inserted into the outer cylinder (10) A plurality of combustion gas moving holes 122 are arranged circumferentially spaced apart from each other by a predetermined distance and a plurality of pin coupling holes 126 are formed between the combustion gas moving holes 122, An upper guide ring (120) fixedly coupled to an upper inner surface of the inner tube (10); A plurality of combustion gas moving holes 182 are disposed circumferentially spaced apart from each other by a predetermined distance and a plurality of pin coupling holes 186 are formed between the combustion gas moving holes 182, A lower guide ring 180 fixedly coupled to the lower inner surface; A plurality of combustion gas moving holes 142 and 162 arranged circumferentially spaced apart from each other by a predetermined distance and a plurality of pin coupling holes 146 and 166 disposed between the combustion gas moving holes 142 and 162 are formed First and second intermediate guide rings 140 and 160 positioned between the upper guide ring 120 and the lower guide ring 160; And one end thereof is fixedly coupled to the pin coupling hole 126 of the upper guide ring 120 and the other end is fixed to the pin coupling hole (not shown) of the first intermediate guide ring 140 146; < / RTI > And one end of each end is fixedly coupled to the pin coupling hole 146 of the first intermediate guide ring 140 and the other end is fixed to the pin coupling hole 146 of the second intermediate guide ring 160 A second heat transfer fin (150) fixedly coupled to the hole (166); And one end thereof is fixedly coupled to the pin engagement hole 166 of the second intermediate guide ring 160 and the other end is fixed to the pin engagement hole 167 of the lower guide ring 180 186; < / RTI > As a technical feature.

The other end of the first heat transfer fin 130 coupled to the pin coupling hole 146 of the first intermediate guide ring 140 and one end of the second heat transfer fin 150 are connected to each other by pin coupling The other end of the second heat transfer fin 130 coupled to the pin coupling hole 166 of the second intermediate guide ring 160 is fixedly coupled to each of the adjacent pin coupling holes in the hole 146, And one end of the third heat transfer fin 170 may be fixedly coupled to the adjacent pin coupling holes 166 of the second intermediate guide ring 160 so as not to be connected to each other.

The present invention proposes a construction in which only a guide ring is welded to the inner surface of the inner cylinder while a plurality of heat transfer fins guiding the movement of the combustion gas are fixedly coupled to the guide ring, thereby making it possible to drastically shorten the manufacturing process of the heat exchange apparatus.

In addition, the present invention minimizes the problem of reduction in heat cutting efficiency caused by the damage of the welded portion due to the high-temperature combustion gas by minimizing the welding of the heat transfer means and the inner passage.

According to the present invention, a combustion gas moving hole through which a combustion gas can pass can be formed at a predetermined interval in each guide ring to temporarily stagnate the movement of the combustion gas, and a heat transfer pin for guiding the movement of the combustion gas is staggered By mutually staggering, the combustion gas is guided to travel a longer distance before being discharged, so that even more heat can be transferred to the cooling water even if the same combustion heat is used.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic external view of a preheater heat exchanger for a vehicle according to the present invention. FIG.
2 is a schematic cross-sectional view of a preheater heat exchanger for a vehicle according to the present invention.
3 is a schematic structural view of a heat transfer means in a preheater heat exchanger for a vehicle according to the present invention;
4 is a schematic structural view of a conventional preheater for a vehicle.
5 is a schematic structural view of a heat exchanging means in a conventional preheater heat exchanger for a vehicle.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings. However, the present invention is not limited to the technical features of the present invention, A detailed description thereof will be omitted.

FIG. 1 is a schematic outline configuration diagram of a preheater heat exchanger for a vehicle according to the present invention, and FIG. 2 is a schematic sectional configuration diagram of a preheater heat exchanger for a vehicle according to the present invention. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger for a vehicle preheater, and is basically composed of an outer cylinder 20, an inner cylinder 10, and heat exchange means 1 provided on the inner surface of the inner cylinder 10. Hereinafter, each of these configurations will be described in detail.

The outer tube 20 is opened at one side and the other side is closed to form an inner space, and a cooling water inlet 22 and a cooling water outlet 26 are provided. Each of the cooling water inlet 22 and the cooling water outlet 26 is a portion through which the cooling water used for heating the vehicle is introduced and discharged and is spaced apart from the heat exchanging means 1 by a predetermined distance .

The inner tube 10 is opened at one side and sealed at the other side and is inserted into the inner space of the outer tube 20 with the cooling water guide 16 and the heat exchange means 1. [ As can be seen from the figure, when the inner cylinder 10 is inserted into the outer cylinder 20, a space is formed between the inner cylinder outer surface and the inner cylinder outer surface at a predetermined interval, and the cooling water flows through the space.

One side opened in the inner tube 10 functions as a combustion gas inlet 12, and the inner space functions as a combustion chamber. As shown in FIG. 4, the combustion gas inlet 12 is provided with a conventional combustion device including a drive motor, an ignition device, a fuel pump, and a diffusion plate.

A combustion gas outlet (14) is provided at one side of the combustion gas inlet (12). The combustion gas discharge port 14 is a part which is ignited by the combustion device and is discharged to the outside after the combustion gas flowing into the combustion chamber moves through the heat exchange means 1. The combustion gas discharged to the combustion gas discharge port (14) is discharged to the outside in a state where the temperature is separated by the heat transferred to the cooling water.

The cooling water guide pipe (16) is provided on the outer surface of the inner cylinder (10). Although the shape of the cooling water guide pipe is not particularly limited, it is preferable that the cooling water flowing through the cooling water inlet 22 is spirally shaped so as to absorb heat naturally while moving along the outer surface of the inner pipe and then discharged through the cooling water outlet 26 (In Fig. 2, symbols ⊙ and ⓧ are each a schematic movement direction of the cooling water). The cooling water heated by absorbing heat from the combustion gas is used for heating the vehicle.

The heat transfer means 1 is a medium for guiding the movement of the combustion gas and transferring the heat of the combustion gas to the inner cylinder 10. The present invention can be applied to the heat transfer means 1, Rings and heat transfer fins.

First, the guide ring includes upper and lower guide rings 120 and 180 and first and second intermediate guide rings 140 and 160, wherein the upper guide ring 120 and the lower guide ring 180, respectively, And the first and second intermediate guide rings 140 and 160 are disposed between the upper and lower guide rings 120 and 180. The first and second intermediate guide rings 140 and 160 are fixed to the upper inner surface and the lower inner surface of the upper guide ring 10 by welding or the like. The specific positions of the first and second intermediate guide rings can be arbitrarily changed between the upper and lower guide rings.

A plurality of combustion gas moving holes 122, 142, 166, 182 and a plurality of pin coupling holes 126, 146, 166, 186 are formed in each guide ring. Among them, the combustion gas moving holes are parts for movement of the combustion gas, and are arranged circumferentially spaced apart from each other by a predetermined distance. The pin coupling hole is a portion to which both ends of the heat transfer fin are fixedly coupled, and is disposed between the combustion gas moving holes.

That is, according to the present invention, only the upper and lower guide rings 120 and 180 among the guide rings are fixedly coupled to the inner cylinder, and the intermediate guide ring mediated therebetween is structured to be supported by heat- By minimizing the area, it is possible to drastically reduce the heat cutting efficiency caused by the damage of the welded portion by the high temperature combustion gas.

The first and second heat transfer fins 130 and 150 are formed of a first heat transfer fin 130 and a second heat transfer fin 130. The first heat transfer fin 130 includes first, And both ends of the second heat transfer fin 150 are fixedly coupled to the first intermediate guide ring 140 and the second intermediate guide ring 160 and both ends of the third heat transfer fin 170 are fixed And is fixedly coupled to the second intermediate guide ring 160 and the lower guide ring 180. Each of the first, second, and third heat transfer fins 130, 150, and 170 is formed by a plurality of heat dissipation fins 130, 150, and 170 that are spaced apart from each other.

Each of these heat transfer fins is a part for guiding the movement of the combustion gas, and both ends are fixedly coupled to the guide ring by welding. As described above, according to the present invention, since the plurality of heat transfer fins guiding the movement of the combustion gas are not directly welded to the inner surface of the inner tube, but only the guide ring (particularly the upper and lower guide rings) Is welded to the inner surface of the inner tube, it is possible to minimize the welded portion, and the manufacturing process of the heat exchanger can be greatly shortened.

In the meantime, the present invention proposes a configuration in which heat transfer fins adjacent to one side and the other side of each guide ring are fixedly coupled to each other, and adjacent heat transfer fins are fixedly coupled with each other by a staggered structure.

3, the other end of the first heat transfer fin 130 fixed to the pin coupling hole 146 of the first intermediate guide ring 140 and one end of the second heat transfer fin 150 are connected to each other The intermediate guide ring 140 is fixedly coupled to the adjacent pin holes of the pin guide hole 146 of the intermediate guide ring 140 so as not to be connected to each other and is coupled to the pin guide hole 166 of the second intermediate guide ring 160 The other end of the second heat transfer fin 130 and one end of the third heat transfer fin 170 are fixedly coupled to each other adjacent pin holes in the pin engagement hole 166 of the second intermediate guide ring 160, So that it is not connected.

In this case, the cooling water can absorb the maximum amount of heat from the combustion gas while being associated with the constitution of the combustion gas moving hole formed in each guide ring. Here's an overview of why.

As shown in FIG. 2, when the combustion gas flows into the combustion gas inlet 12, the combustion gas moves to the lower portion of the inner cylinder 10 through the combustion chamber (inner space) (180). Since the only part of the lower guide ring 180 where the combustion gas can move is the combustion gas transfer hole 182 formed at a predetermined interval, the movement of the combustion gas is temporarily stagnated, And is transmitted to the cooling water through the guide ring 180.

The combustion gas exiting the combustion gas transfer hole 182 of the lower guide ring 180 is guided by the third heat transfer fin 170 to the second intermediate guide ring 160. During the movement of the combustion gas, Some of which are transferred to the cooling water through the inner cylinder 10. Since the portion of the second intermediate guide ring 160 where the combustion gas can move is the combustion gas moving hole 162 as in the case of the lower guide ring 180, So that some of the heat of the combustion gas is transferred to the cooling water through the second intermediate guide ring 160.

The ends of the third heat transfer fin 170 and the second heat transfer fin 150 that are fixed to the second intermediate guide ring 160 are not connected to each other but are staggered with respect to the second intermediate guide ring 16 The combustion gas passing through the second intermediate guide ring 160 is not directly guided by the second heat transfer fin 150 but is guided by the second heat transfer fin 150 and then guided. In other words, the combustion gas becomes a zig-zag moving path through the guide ring and becomes longer. The longer the travel path of the combustion gas means that the contact time with the cooling water is longer, so that more heat can be transferred to the cooling water.

In the above-described process, the combustion gas is guided by the second heat transfer fin 150 to meet with the first intermediate guide ring 140 and then guided by the first heat transfer fin 130 to be brought into contact with the upper guide ring 120 It happens. That is, heat of the combustion gas is temporarily stored in the intermediate guide ring 140 and the upper guide ring 120, and is transferred to the cooling water, and the moving path of the combustion gas is changed into zigzag by the intermediate guide ring 140,

As described above, in the present invention, it is possible to suppress the movement of the combustion gas to the maximum through the constitution of the combustion gas moving hole and additionally to induce the combustion gas to move in a zigzag manner, thereby maximally increasing the contact time of the cooling water. So that more heat can be transferred to the cooling water. In the drawing, a structure in which a part of the upper guide ring 120 is not closed but is opened in a partial region is taken into consideration of the combustion gas outlet 14.

Although the above-described example is based on four guide rings (three heat transfer fins), the number of guide rings (the number of heat transfer fins) may be variously changed without deteriorating the characteristics of the present invention. Further, it is apparent that other technical features may be added and implemented based on the disclosed technical idea.

10: inner tube 20: outer tube
120: upper guide ring 130: first heat transfer pin
140: first intermediate guide ring 150: second heat transfer pin
160: second intermediate guide ring 170: third heat transfer pin
180: Lower guide ring

Claims (2)

An outer tube 20 having a cooling water inlet 22 on one side and a cooling water outlet 26 on the other side and a heat transfer means 1 and a cooling water guide 16 on the inner and outer surfaces, A preheater heat exchanger for a vehicle, comprising a gas inlet (12) and a combustion gas outlet (14) and an inner cylinder (10) inserted into the outer cylinder (10)
The heat transfer means (1)
A plurality of combustion gas moving holes 122 are arranged circumferentially spaced apart from each other by a predetermined distance and a plurality of pin coupling holes 126 arranged between the combustion gas moving holes 122 are formed, An upper guide ring 120 fixedly coupled to the upper inner surface;
A plurality of combustion gas moving holes 182 are disposed circumferentially spaced apart from each other by a predetermined distance and a plurality of pin coupling holes 186 are formed between the combustion gas moving holes 182, A lower guide ring 180 fixedly coupled to the lower inner surface;
A plurality of combustion gas moving holes 142 and 162 arranged circumferentially spaced apart from each other by a predetermined distance and a plurality of pin coupling holes 146 and 166 disposed between the combustion gas moving holes 142 and 162 are formed First and second intermediate guide rings 140 and 160 positioned between the upper guide ring 120 and the lower guide ring 160;
And one end thereof is fixedly coupled to the pin coupling hole 126 of the upper guide ring 120 and the other end is fixed to the pin coupling hole (not shown) of the first intermediate guide ring 140 146; < / RTI >
And one end of each end is fixedly coupled to the pin coupling hole 146 of the first intermediate guide ring 140 and the other end is fixed to the pin coupling hole 146 of the second intermediate guide ring 160 A second heat transfer fin (150) fixedly coupled to the hole (166);
And one end thereof is fixedly coupled to the pin engagement hole 166 of the second intermediate guide ring 160 and the other end is fixed to the pin engagement hole 167 of the lower guide ring 180 186; < / RTI >
Wherein the preheater heat exchanger is a heat exchanger. The method according to claim 1,
The other end of the first heat transfer fin 130 coupled to the pin coupling hole 146 of the first intermediate guide ring 140 and one end of the second heat transfer fin 150 are connected to each other by pin coupling The other end of the second heat transfer fin 130 coupled to the pin coupling hole 166 of the second intermediate guide ring 160 is fixedly coupled to each of the adjacent pin coupling holes in the hole 146, And one end of the third heat transfer fin (170) are fixedly coupled to each other in adjacent pin coupling holes in the pin coupling hole (166) of the second intermediate guide ring (160) Preheater heat exchanger.

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