Heat exchange assembly of fuel heater for passenger car heating

Abstract

The utility model relates to a heat exchange assembly of a fuel heater for passenger car heating. The heat exchange assembly comprises a pipeline and a plurality of fin sets. Smoke circulates in the pipeline, and the outer side of the pipeline is in contact with a heat exchange medium. The plurality of fin groups extend along the flowing direction of the flue gas in the pipeline; the fin group comprises a plurality of fins, and the plurality of fins are arranged along the circulation direction; and the extension direction of at least part of the fins in the fin group is inclined relative to the circulation direction. According to the utility model, firstly, the heat exchange area of the fin group in unit length is increased, secondly, when flue gas circulates in the pipeline, the turbulence degree of the flue gas is increased by the structure of part of the fins, so that the flue gas is more fully contacted with part of the fins, the waste heat of the flue gas is fully absorbed, the waste heat discharged out of a vehicle is reduced, and the energy efficiency of an air conditioner is improved.

Description

A heat exchange component for a fuel-fired heater used for bus heating Technical Field

[0001] This application belongs to the field of air conditioning technology for fuel-powered buses, and in particular relates to a heat exchange component for a fuel-powered heater used for heating buses. Background Technology

[0002] The independent heating principle of a fuel-powered bus is to use the heat generated by the combustion of fuel (diesel or kerosene) in the fuel heater. This heat is absorbed by a medium (usually a mixture of water and ethylene glycol in a certain proportion), and then the heated high-temperature medium is transported by a water pump to a heat exchanger. Finally, the heat exchanger transfers the heat to the surrounding air, thereby heating the air and raising the temperature inside the bus.

[0003] Currently, the heat exchange efficiency on the flue gas side of the heater is not high. Even after heat exchange, the exhaust gas temperature is still very high, reaching around 400 degrees Celsius, and much of the waste heat is not fully absorbed by the medium inside the shell. In other words, the existing finned heat exchanger results in a low thermal energy conversion rate from fuel combustion, leading to poor air conditioning efficiency. Summary of the Invention

[0004] The technical problem to be solved by this utility model is to provide a heat exchange component for a fuel-fired heater for bus heating, in order to overcome the insufficient heat exchange efficiency of the flue gas side of the heat exchanger in the prior art.

[0005] The technical solution adopted by this utility model to solve its technical problem is:

[0006] A heat exchange assembly for a fuel-fired heater used for heating in a passenger vehicle includes:

[0007] The pipe has an interior for flue gas circulation and an exterior for heat exchange medium contact.

[0008] A plurality of fin groups, wherein each of the plurality of fin groups extends along the flow direction of the flue gas in the duct; each fin group includes a plurality of fins, wherein the plurality of fins are arranged along the flow direction; at least a portion of the fins in the fin group extend in a direction inclined relative to the flow direction.

[0009] In an optional embodiment, the projection of the fin along the tangent direction of the pipe circumference is a rectangle, and the projection of the fin along the radial direction of the pipe is a parallelogram with each side being an arc or a straight line.

[0010] In an optional embodiment, the fin assembly further includes a fixing strip extending along the flow direction, and a plurality of the fins are fixed to the fixing strip.

[0011] In an optional embodiment, the fins are fixed on both sides of the fixing strip along the circumferential tangent direction of the pipe.

[0012] In an optional embodiment, in a single fin group, a plurality of the fins are divided into straight fins and inclined fins, wherein the straight fins extend in the direction of flow along the flow direction, and the inclined fins extend in the direction of inclination relative to the flow direction.

[0013] In an optional embodiment, in a single fin group, the straight fins are arranged relatively forward and the inclined fins are arranged relatively backward along the flow direction within the duct.

[0014] In an optional embodiment, the heat exchange assembly of the fuel-fired heater for bus heating further includes a sleeve, which is fitted over the outside of the pipe, and an interlayer space is formed between the sleeve and the pipe for the heat exchange medium to circulate.

[0015] In an optional embodiment, the sleeve includes a sleeve body, a medium inlet, and a medium outlet. The medium inlet and the medium outlet are respectively connected to both ends of the sleeve body along the flow direction, and both the medium inlet and the medium outlet are in communication with the interlayer space.

[0016] In an optional embodiment, the extension direction of the medium inlet and / or the medium outlet forms an angle of 0° to 45° with the circumferential tangent direction of the pipe.

[0017] In an optional embodiment, the fin groups are arranged in more than 23 groups along the circumferential direction of the pipe.

[0018] The beneficial effects of this invention are as follows: Several fin groups extend along the flow direction of the pipe, and at least some individual fins in the fin groups extend at an angle relative to the flow direction. This arrangement firstly increases the heat exchange area per unit length of the fin group. Secondly, when flue gas flows in the pipe, the structure of some fins increases the turbulence of the flue gas, allowing for more thorough contact between the flue gas and some fins, achieving full absorption of waste heat from the flue gas, reducing waste heat discharged outside the vehicle, and improving air conditioning efficiency. From an environmental perspective, it also increases the thermal energy converted from the chemical energy of fuel. Under the same heat conditions, it reduces fuel consumption, which is beneficial for energy conservation and emission reduction. Attached Figure Description

[0019] The technical solution of this application will be further described below with reference to the accompanying drawings and embodiments.

[0020] Figure 1 is a perspective view of the heat exchange component structure of a fuel-fired heater for bus heating according to an embodiment of this application;

[0021] Figure 2 is a front view of the heat exchange component structure of a fuel-fired heater for bus heating according to an embodiment of this application;

[0022] Figure 3 is a schematic diagram of the fin assembly projected radially along the pipe according to an embodiment of this application;

[0023] Figure 4 is a schematic diagram of the fin assembly along the tangential direction of the pipe according to an embodiment of this application;

[0024] Figure 5 is a perspective view of the fin assembly structure according to an embodiment of this application.

[0025] The attached figures are labeled as follows:

[0026] 1. Pipeline;

[0027] 2. Fin assembly; 20. Fixing strip; 21. Fin; 211. Straight fin;

[0028] 212. Inclined fins;

[0029] 3. Casing; 31. Casing body; 32. Medium inlet; 33. Medium outlet;

[0030] 4. Mezzanine space. Detailed Implementation

[0031] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0032] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the scope of protection of this application. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0033] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art will understand the specific meaning of the above terms in this application based on the specific circumstances.

[0034] The technical solution of this application will now be described in detail with reference to the accompanying drawings and embodiments.

[0035] This embodiment provides a heat exchange assembly for a fuel-fired heater used for heating buses, as shown in Figures 1-3, including: a pipe 1 and several fin groups 2.

[0036] The interior of the pipe 1 is for flue gas to circulate, and the exterior is for heat exchange medium to contact. Several of the fin groups 2 extend along the flue gas flow direction in the pipe 1; each fin group 2 includes several fins 21, which are arranged along the flow direction; at least a portion of the fins 21 in the fin group 2 extend in a direction that is inclined relative to the flow direction.

[0037] The heat exchange assembly of the fuel-fired heater for bus heating provided in this embodiment has several fin groups 2 extending along the flow direction of the pipe 1. At least some individual fins 21 in the fin groups 2 extend at an angle relative to the flow direction. This arrangement firstly increases the heat exchange area per unit length of the fin groups 2. Secondly, when flue gas flows in the pipe, the structure of some fins 21 increases the flue gas turbulence, allowing for more thorough contact between the flue gas and some fins 21, achieving full absorption of waste heat from the flue gas, reducing waste heat discharged outside the vehicle, and improving air conditioning efficiency. From an environmental perspective, it also increases the thermal energy converted from the chemical energy of fuel. Under the same heat conditions, it reduces the amount of fuel used, which is beneficial for energy conservation and emission reduction.

[0038] The heat exchange component of the fuel-fired heater for bus heating provided in this embodiment works on the following principle: at least some individual fins 21 extend in a direction that is inclined relative to the flow direction. In this structure, since some fins 21 are inclined, their actual length is greater than the length along the flow direction, which increases the heat exchange area per unit length of the fin group 2. Secondly, when flue gas flows in the pipe 1, the part of some fins 21 that is inclined relative to the flow direction can cause local turbulence when the flue gas flows, increase the flue gas turbulence, and prolong the time required for the flue gas to pass through the surface of the fins 21. Therefore, this structure improves the heat exchange capacity of the fin group 2.

[0039] In an optional embodiment, as shown in Figures 2-4, the projection of fin 21 along the tangent direction of the circumference of pipe 1 is a rectangle, and the projection of fin 21 along the radial direction of pipe 1 is a parallelogram with curved or straight sides (in this embodiment, a parallelogram with straight sides refers to a parallelogram in the usual sense, and a parallelogram with curved sides refers to a parallelogram that is different from a parallelogram in the usual sense, where two pairs of sides are parallel curved lines). In this embodiment, fin 21 is designed as an inclined rectangular piece, which simplifies the manufacturing process. To achieve the inclination of fin 21, a method of applying torque to deform a traditional fin can be used to produce the fin 21 described in this embodiment. Therefore, this solution does not significantly increase the manufacturing cost of fin assembly 2 and is beneficial for industrialization.

[0040] In an optional embodiment, as shown in Figures 2 and 5, the fin assembly 2 further includes a fixing strip 20 extending along the flow direction, to which a plurality of fins 21 are fixed. In this embodiment, a plurality of fins 21 can be arranged based on the fixing strip 20 extending along the flow direction, making it easy to control the arrangement path of the fins 21 and convenient to fix the fins 21. Optionally, the fin assembly 2 is a one-piece molded sheet metal part, which can reduce manufacturing costs.

[0041] In an optional embodiment, as shown in Figures 2 and 5, fins 21 are fixed on both sides of the fixing strip 20 along the circumferential tangent direction of the pipe 1. In this embodiment, two rows of fins 21 are arranged on both sides of a fixing strip 20, which can increase the density of fin distribution and increase the heat exchange area of ​​a single fin group 2.

[0042] In an optional embodiment, as shown in FIG5, in a single fin group 2, a plurality of fins 21 are divided into straight fins 211 and inclined fins 212. The straight fins 211 extend in the flow direction, while the inclined fins 212 extend in an inclined direction relative to the flow direction. In this embodiment, it is not necessary to tilt all the fins 21 in the process, which can reduce the process cost. For example, when the straight fins 211 are processed into inclined fins 212 by sheet metal processing, only a portion of the straight fins 211 need to be processed.

[0043] In an optional embodiment, as shown in Figure 5, in a single fin group 2, straight fins 211 are arranged relatively forward along the flow direction within the pipe 1, while inclined fins 212 are arranged relatively backward. The terms "relatively forward" and "relatively backward" refer to a point on the pipe 1 as a boundary. The position before reaching this point in the flow direction of the flue gas is considered relatively forward, and the position continuing backward from that point is considered relatively backward. In this embodiment, the principle behind this layout is that the forward position in the flow direction of the pipe 1 is where the flue gas temperature is relatively high, therefore the fins 21 at this position can naturally obtain a relatively higher temperature. Conversely, the backward position in the flow direction of the pipe 1 is where the flue gas temperature is relatively low, and the fins 21 at this position can obtain a relatively lower temperature. Therefore, in this embodiment, the method of arranging straight fins 211 first and then inclined fins 212 along the flow direction in the pipe 1 can ensure that the fins 21 at the rear position in the flow direction of the pipe 1 can also obtain higher heat, thereby improving the heat exchange capacity of the fin group 2 as a whole.

[0044] In an optional embodiment, as shown in Figure 4, the length of the fins 21 arranged relatively forward along the flow direction gradually decreases or partially decreases. The purpose of this design is to reduce the number of small-area fins 21, thereby reducing the process difficulty. Since the forward position in the flow direction of the pipe 1 is where the flue gas temperature is relatively high, the fins 21 at this position can naturally obtain a relatively higher temperature, thus requiring a lower number of fins 21.

[0045] In an optional embodiment, as shown in Figures 1 and 2, the heat exchange assembly of the fuel-fired heater for bus heating further includes a sleeve 3, which is fitted over the outside of the pipe 1, forming an interlayer space 4 between the sleeve 3 and the pipe 1 for the flow of the heat exchange medium. In this embodiment, the interlayer space 4 allows the heat exchange medium to have a large contact area with the outer wall of the pipe 1, so as to remove more heat.

[0046] In an optional embodiment, as shown in Figures 1 and 2, the sleeve 3 includes a sleeve body 31, a medium inlet 32, and a medium outlet 33. The medium inlet 32 ​​and the medium outlet 33 are respectively connected to both ends of the sleeve body 31 along the flow direction, and both the medium inlet 32 ​​and the medium outlet 33 are connected to the interlayer space 4. In this embodiment, the interlayer space 4 is formed by matching the sleeve body 31 with the pipe 1, and the heat exchange medium is introduced and discharged through the medium inlet 32 ​​and the medium outlet 33. The medium inlet 32 ​​and the medium outlet 33 are respectively connected to both ends of the sleeve body 31 along the flow direction, and their function is to maximize the length of the path through which the heat exchange medium flows along the surface of the pipe 1, ensuring more sufficient heat exchange between the heat exchange medium and the surface of the pipe 1.

[0047] In an optional embodiment, as shown in FIG2, the extension direction of the medium inlet 32 ​​and / or the medium outlet 33 forms an angle of 0° to 45° with the circumferential tangent direction of the pipe 1. In this embodiment, this design allows the heat exchange medium to flow more smoothly in the interlayer space 4 as shown in FIG1, thereby increasing the length of the path along the surface of the pipe 1 and promoting more thorough heat exchange between the heat exchange medium and the surface of the pipe 1.

[0048] In an optional embodiment, as shown in FIG2, more than 23 fin groups 2 are arranged along the circumferential direction of the pipe 1. In this embodiment, by arranging more than 23 fin groups 2 in the circumferential direction of the pipe 1, a sufficient number of fin groups 2 can be arranged in a limited space, so that the pipe 1 can obtain as much heat as possible.

[0049] Based on the above-described preferred embodiments according to this application, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this application. The technical scope of this application is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A heat exchange assembly for a fuel-fired heater used for heating passenger vehicles, characterized in that, include: Pipe (1), the inside of the pipe (1) is for flue gas to circulate, and the outside is for heat exchange medium to contact; A plurality of fin groups (2), all of which extend along the flow direction of the flue gas in the pipe (1); the fin group (2) includes a plurality of fins (21), which are arranged along the flow direction; at least a portion of the fins (21) in the fin group (2) have an extension direction that is inclined relative to the flow direction.

2. The heat exchange assembly of the fuel-fired heater for bus heating according to claim 1, characterized in that, The projection of the fin (21) along the tangent direction of the circumference of the pipe (1) is a rectangle, and the projection of the fin (21) along the radial direction of the pipe (1) is a parallelogram with each side being an arc or a straight line.

3. The heat exchange assembly of the fuel-fired heater for bus heating according to claim 1, characterized in that, The fin assembly (2) further includes a fixing strip (20) extending along the flow direction, and a plurality of the fins (21) are fixed to the fixing strip (20).

4. The heat exchange assembly of the fuel-fired heater for bus heating according to claim 3, characterized in that, The fixing strip (20) has fins (21) fixed on both sides along the circumferential tangent direction of the pipe (1).

5. The heat exchange assembly of the fuel-fired heater for bus heating according to any one of claims 1-4, characterized in that, In a single fin group (2), a plurality of fins (21) are divided into straight fins (211) and inclined fins (212), wherein the straight fins (211) extend in the direction of flow, and the inclined fins (212) extend in the direction of flow.

6. The heat exchange assembly of the fuel-fired heater for bus heating according to claim 5, characterized in that, In a single fin group (2), straight fins (211) are arranged relatively forward and inclined fins (212) are arranged relatively backward along the flow direction in the pipe (1).

7. The heat exchange assembly of the fuel-fired heater for bus heating according to any one of claims 1-4, characterized in that, The heat exchange assembly of the fuel-fired heater for bus heating also includes a sleeve (3), which is sleeved outside the pipe (1), and an interlayer space (4) is formed between the sleeve (3) and the pipe (1) for the heat exchange medium to circulate.

8. The heat exchange assembly of the fuel-fired heater for bus heating according to claim 7, characterized in that, The sleeve (3) includes a sleeve body (31), a medium inlet (32) and a medium outlet (33). The medium inlet (32) and the medium outlet (33) are respectively connected to the two ends of the sleeve body (31) along the flow direction. The medium inlet (32) and the medium outlet (33) are both connected to the interlayer space (4).

9. The heat exchange assembly of the fuel-fired heater for bus heating according to claim 8, characterized in that, The extension direction of the medium inlet (32) and / or the medium outlet (33) forms an angle of 0° to 45° with the circumferential tangent direction of the pipe (1).

10. The heat exchange assembly of the fuel-fired heater for bus heating according to claim 9, characterized in that, Along the circumferential direction of the pipe (1), there are more than 23 sets of fin groups (2).

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