KR100692757B1 - Preheater for bus - Google Patents

Abstract

The present invention relates to an air-heated preheater, and more particularly, by installing a non-uniform other barrier wall in the flow path of the exhaust gas, thereby inducing the flow of the exhaust gas discharged from the heat source to a uniform flow without being biased to one side. The present invention relates to an air-heated preheater capable of uniformly and efficiently obtaining the heat transfer effect of exhaust gas for indoor heating.

To this end, in the exhaust structure of the air-heated preheater comprising a combustion chamber connected to the heating burner of the present invention and arranged inside the combustion cylinder, and an exhaust pipe connected to a lower end of the combustion cylinder, the outer diameter of the combustion chamber It provides an air-heated pre-heater characterized in that a plurality of non-uniform other bulkheads in the exhaust gas flow passage formed between the inner diameter of the combustion cylinder and.

Preheater, combustion chamber, combustion cylinder, exhaust gas flow passage, nonuniform other bulkhead

Description

Air Heated Preheater {Preheater for bus}

1 is a cross-sectional view showing an exhaust structure of an air-heated preheater according to the present invention, in which a non-uniform other bulkhead is installed;

2 is a cross-sectional view taken along the line A-A of FIG.

3 is a cross-sectional view taken along the line B-B of FIG.

4 is a cross-sectional view taken along the line C-C of FIG.

5 is a schematic diagram showing a swirling flow of exhaust gas according to an exhaust structure of an air-heated preheater according to the present invention, wherein a non-uniform other bulkhead is installed;

6 and 7 are a perspective view showing a conventional air-heated preheater for the bus,

8 and 9 are cross-sectional views showing the flow of heating air in a conventional air-heated preheater for the bus.

<Explanation of symbols for the main parts of the drawings>

10: case 12: inlet

14: combustion cylinder 16: heating fin

18: heating burner 20: fan

22: exhaust pipe 24: air guide

26: combustion chamber 28: radiator

28a: first non-uniform other bulkhead

28b: second non-uniform strike wall

28c: third non-uniform strike wall

30: exhaust gas flow passage 32: perforation

A: upper region B: lower region

The present invention relates to an air-heated preheater, and more particularly, by installing a non-uniform other barrier wall in the flow path of the exhaust gas, thereby inducing the flow of the exhaust gas discharged from the heat source to a uniform flow without being biased to one side. The present invention relates to an air-heated preheater capable of uniformly and efficiently obtaining the heat transfer effect of exhaust gas for indoor heating.

Recently, as the high-speed bus vehicle has become a major means of transportation, the interest in the comfort and pleasant thermal environment of the cabin space of drivers and passengers has increased. It is recognized as an important task.

In general, large buses are equipped with a pre-heater system for heating the cabin during winter, and the design of the heater system includes performance aspects such as heating efficiency, eco-friendliness, noise, and comfort, as well as maintainability, economy, and safety. At the same time, among these, the heating fast-acting performance, which means supplying the proper warm air to the interior of the cabin as soon as possible after the heater is activated, is a very important item.

Referring to Figures 6 to 9 attached to the configuration for the air-heated pre-heater that is applied to the large bus as follows.

The air-heated preheater has a predetermined volume and has an inlet 12 of cold outside air formed on an upper surface thereof, and a case 10 formed with an outlet outlet of heated air on one side thereof; A heating element installed inside the case 10 and configured to include a combustion cylinder 14 and a heat transfer fin 16 to directly heat cold inflow air; A heating burner (18) connected to the heating element to suck air and fuel to generate a heat source through combustion; A pair of fans 20 mounted to the rear of the case 10 to blow heated hot air into the room; And an exhaust pipe 22 or the like connected to the lower surface of the combustion cylinder 14 and serving as an exhaust path of the exhaust gas.

At this time, the combustion chamber 26 of the combustion cylinder 14 of the heat transfer body is connected to the heating burner 18, the combustion cylinder so as to increase the heat transfer area with the outside air for the purpose of maximizing heat exchange. The heat transfer fins 16 are disposed on the outer surface of 14.

On the other hand, when the indoor heating using the cooling water heated in the engine, the writer 28 is a heat exchange is mounted separately to the outside air inlet 12 side of the case 10.

In addition, the air guide 24 is integrally mounted around the heat transfer fin 16 to improve heat transfer to the cold outside air introduced into the heater case 10. It serves to guide to pass through the proximity region of the heat transfer fin (16).

The operating principle of the air-heated preheater having this configuration is that when the preheater switch is turned on, the heating plug is heated for 5 seconds so that the blower fan 20 and the fuel pump (not shown) are driven by the ECU (not shown). Next, fuel and air are supplied to the heating burner 18 and ignited, and at the same time, the fan 20 is operated to induce cold air into the heater case 10.

In this state, after about 5 to 6 minutes, the heat is transferred to the external cold air passing through the combustion cylinder 14 and the heating fins 16, which become the heating heat source, to supply the warm air into the cabin.

At this time, the exhaust gas burned in the combustion cylinder 14 is discharged through the exhaust pipe 22, and when the coolant temperature of the engine is about 65 degrees, the preheater is automatically turned off. As a heat source, indoor heating is continued.

As such, the air heating preheater for heating the vehicle interior in winter can be equipped with a heating fin to increase the heat transfer area to improve heat exchange efficiency. Also, by placing the air guide around the combustion cylinder, Although the heat exchange is performed well, the heat exchange efficiency between the cold outside and the heat transfer elements (combustion and heat transfer fins) is not very good because the flow rate of the combustion gas inside the combustion cylinder is high and the air flow rate of the fan must be maintained at a certain level. There are disadvantages.

In addition, when the heating burner is operated, the temperature of the inner wall of the combustion cylinder is about 500 ° C. or more, but the temperature of the exhaust gas discharged by combustion is about 250 ° C. or more, so that heat exchange is not performed properly, and the exhaust gas is discharged with a heat source. It adversely affects the speed effect.

As such, the heating effect (the supply of adequate warm air into the cabin within a short time after the pre-heater operation) drops, causing cold and winter drivers and passenger complaints, and the exhaust pipe temperature is high. As it is maintained at a high temperature due to the exhaust gas, there is a problem in that the ambient temperature of the preheater case and the like adjacent to the exhaust pipe is increased to cause local thermal deformation due to thermal stress on the adjacent parts.

In particular, the structure of the existing combustion cylinder and the combustion chamber has a disadvantage that the heat transfer effect of the exhaust gas can not be largely obtained, for the following reasons.

That is, as shown in FIG. 9, a combustion chamber 26 in which a heat source is ejected from the heating burner is formed in the combustion cylinder 14, and the combustion chamber 26 and the combustion cylinder 14 are exhaust gas. The flow passages 30 are disposed to be spaced apart from each other, and the exhaust pipe 22 is connected to the lower end of the combustion cylinder 14.

Accordingly, as shown in FIG. 9, the exhaust gas combusted shows a flow in the direction of the arrow. Since the exhaust pipe 22 is located only at the lower side of the combustion cylinder 14, most of the returned exhaust gas flow is the combustion cylinder. Since the lower region B of the exhaust gas flow passage 30 is well-transmitted because it is biased toward the lower portion rather than the upper end, the upper region A of the exhaust gas flow passage 30 has a relatively small amount of exhaust gas flow so that the heat transfer is good. There is a disadvantage that is not made.

The present invention has been made in view of the above, by installing a non-uniform other barrier wall in the exhaust gas passage between the combustion chamber and the combustion cylinder, the exhaust gas is discharged in a uniform flow, air for indoor heating It is an object of the present invention to provide an air-heated preheater capable of further utilizing the exhaust gas discharged from the heated preheater as a heat source.

In the present invention for achieving the above object is an air-heated pre-heater comprising a combustion chamber connected to the heating burner and arranged inside the combustion cylinder, and an exhaust pipe connected to the lower end of the combustion cylinder,

Provided is an air-heated preheater characterized in that a plurality of non-uniform other barrier ribs are provided in the exhaust gas flow passage formed between the outer diameter of the combustion chamber and the inner diameter of the combustion cylinder.

In a preferred embodiment, the three non-uniform other bulkheads are arranged at equal intervals in the exhaust gas flow passage, and the upper ends of the first and third non-uniform other bulkheads disposed at both ends (in the upper region of the exhaust gas flow passage). ), A large sized hole is formed, and a smaller sized hole is formed toward the lower portion (arranged in a lower area connected to the exhaust pipe side).

In a more preferred embodiment, a small sized perforation is formed at the upper end of the second nonuniform perforated barrier wall disposed in the upper region of the exhaust gas flow passage disposed between the first and third nonuniform perforated barrier walls, It is characterized in that a larger sized perforation is formed toward the lower portion (located in the lower region connected to the exhaust pipe side).

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

1 is a cross-sectional view illustrating a state in which an air-tight preheater according to the present invention is provided with an exhaust structure of a non-uniform other bulkhead.

The present invention is to install a non-uniform other barrier wall in the exhaust gas flow path between the combustion chamber and the combustion cylinder, so that the exhaust gas is discharged in a uniform flow, the exhaust gas discharged from the air-heated preheater for indoor heating The main point is to make the best use of it.

As described above, the combustion chamber 26 is connected to a heating burner 18 in which air and fuel are sucked to generate a heat source through combustion, and a combustion cylinder has an equal interval between the outer diameters of the combustion chamber 26. It is formed and spaced apart, the exhaust pipe 22 which is a discharge path of the exhaust gas is connected to the lower end of the combustion cylinder (14).

At this time, the space between the outer diameter of the combustion chamber 26 and the inner diameter of the combustion cylinder 14 is formed as an exhaust gas flow passage (30).

Here, when the exhaust gas flow passage 30 is divided in half into the upper region A and the lower region B, since the exhaust pipe 22 is connected to the lower region B, heat transfer of the exhaust gas is performed in the upper region. Compared with (A), it is better in the lower region (B).

In view of this point, if the exhaust gas flows evenly in the upper region A and the lower region B of the exhaust gas flow passage, heat transfer occurs evenly, thereby improving indoor heating efficiency.

Thus, according to the present invention, a plurality of, preferably three, non-uniform other barrier ribs 28a, 28b, and 28c may be mounted in the exhaust gas flow passage to evenly induce the flow of the exhaust gas.

In the exhaust gas flow passage 30 formed between the outer diameter of the combustion chamber 26 and the inner diameter of the combustion cylinder 14, a plurality of non-uniform punching barriers having perforations 32 are mounted, and three non-uniform perforations are provided. The partition walls 28a, 28b and 28c can be mounted to evenly induce the flow of exhaust gas.
At this time, the non-uniform other barrier ribs 28a, 28b, 28c are formed in a plate-like ring shape, as shown in Figures 2 to 4, concentric with the combustion cylinder 14 and the combustion chamber 26 having a circular cross section. While being disposed as is installed in the form blocking the exhaust gas flow passage (30).
That is, the inner circumferential surface of the other non-uniform bulkhead formed in a ring shape is in close contact with the outer diameter of the combustion chamber 26, and the outer circumferential surface is installed in close contact with the inner diameter of the combustion cylinder 14, so that the combustion cylinder 14 and the combustion chamber ( 26, the exhaust gas flow passage 30 is blocked, and the exhaust gas can flow through the perforations 32 at this time.
At this time, the close contact portion may be joined by a conventional method such as welding.

More specifically, as shown in FIG. 2 and FIG. 4, the upper regions of the first and third non-uniform barrier ribs 28a and 28c disposed at both ends of the three non-uniform barrier ribs 28 are provided. A large sized hole 32 is formed, and a smaller sized hole 32 is formed in the lower region.

Therefore, the upper regions (regions in which large holes are formed) of the first and third non-uniform perforated barrier walls 28a and 28c are disposed in the upper region A of the exhaust gas flow passage 30 and the lower region. (Area formed with smaller perforations) is disposed in the lower region B of the exhaust gas flow passage 30 connected to the exhaust pipe 22.

Also, as shown in FIG. 3, the second non-uniform perforated barrier 28b disposed between the first and third non-uniform perforated barrier ribs 28a and 28c may have a small perforation in the upper region thereof. 32 is formed, and a larger sized hole 32 is formed in the lower region.

Therefore, the upper region (region where small sized perforations are formed) of the second non-uniform perforated barrier wall 28b is disposed in the upper region A of the exhaust gas flow passage 30, and the lower region (larger size The perforated region) is disposed in the lower region B of the exhaust gas flow passage 30 connected to the exhaust pipe 22.

That is, the first, second, and third non-uniform barrier ribs 28a, 28b, and 28c are applied to have the same shape and perforation arrangement, but the first and third non-uniform other barrier ribs 28a and 28c are large. The perforated 32 of size is on the upper side (upper region A of the exhaust gas flow passage 30), and the small perforated 32 is on the lower side (lower region B of the exhaust gas flow passage 30). The second non-uniform perforated bulkhead 28b is inverted 180 ° so that the small sized perforation 32 is upward (upper region A of the exhaust gas flow passage 30), and the large sized perforation 32 is formed. It is arranged below this (lower area B of the exhaust gas flow passage 30).

Accordingly, the exhaust gas flowing out from the combustion chamber 26 can flow evenly toward the upper region (A) and the lower region (B) of the exhaust gas flow passage (30), because the exhaust gas flow passage (30) Since the large-sized holes 32 are arranged in the upper regions of the first and third non-uniform other strike walls 28a and 28c disposed in the upper region A, the exhaust gas flow rate increases, and vice versa. Since the small holes 32 are arranged in the lower regions of the first and third nonuniform perforated partitions 28a and 28c disposed in the lower region B of the exhaust gas flow passage 30, the exhaust gas is exhaust gas. The flow rate is at a decrease.

Thus, as the exhaust pipe is connected to the lower region of the exhaust gas flow passage, the phenomenon in which the exhaust gas is biased toward the lower region is prevented from flowing further, thereby obtaining an even heat transfer effect of the exhaust gas.

In addition, as shown in FIG. 5, the lower region B in the upper region A of the exhaust gas flow passage 30 due to the non-uniform other attack barriers 28a, 28b, and 28c of the first, second and third. Induced high-speed exhaust gas swing flow flow from the lower region (B) to the upper region (A), thereby maximizing the heat source recycling effect of the exhaust gas while reducing noise.

As described above, according to the air-heated preheater according to the present invention, by installing a non-uniform other barrier wall in the exhaust gas flow passage between the combustion chamber and the combustion cylinder, the exhaust gas induces a uniform flow to provide room heating. There is an advantage that can further utilize the heat source of the exhaust gas for.

In addition, the non-uniform other bulkhead according to the present invention induces a swirl flow flow of the exhaust gas from the upper region to the lower region or the lower region to the upper region of the exhaust gas flow passage, thereby further maximizing the heat source recycling effect of the exhaust gas Exhaust noise can be reduced.

Claims (3)

In the air-heated preheater comprising a combustion chamber 26 connected to the heating burner 18 and arranged inside the combustion cylinder 14 and an exhaust pipe 22 connected to the lower end of the combustion cylinder 14. , A plurality of non-uniform other barrier ribs 28a, 28b, 28c having perforations 32 are provided in the exhaust gas flow passage 30 formed between the outer diameter of the combustion chamber 26 and the inner diameter of the combustion cylinder 14. The non-uniform other barrier ribs 28a, 28b, and 28c are disposed in a concentric manner with the combustion cylinder 14 and the combustion chamber 26, and the exhaust gas flow passage 30 is formed in such a way as to block the air. Heated Preheater. The method of claim 1, wherein the plurality of non-uniform other barrier ribs 28a, 28b, 28c comprises a first non-uniform other barrier rib 28a, a second non-uniform barrier rib 28b and a third non-uniform barrier rib (3). 28c), wherein the first nonuniform other bulkhead 28a, the second nonuniform other bulkhead 28b and the third nonuniform other bulkhead 28c are equally spaced apart from the exhaust gas flow passage 30. The first and third non-uniform other bulkheads (28a, 28c) disposed on both ends (the upper portion of the exhaust gas flow passage) is formed in the large hole (32) is formed, the lower portion ( Air holes preheater 32 is formed in the lower region connected to the exhaust pipe side). 3. The upper portion of the second non-uniform other bulkhead 28b disposed between the first and third nonuniform other bulkheads 28a and 28c (disposed in the upper region of the exhaust gas flow passage). An air-heated preheater, characterized in that a perforated 32 of size is formed, and a perforated 32 of a larger size is formed toward the lower portion (located in the lower region connected to the exhaust pipe side).

Images