Carbon deposition prevention vehicle heating device heat exchanger and system

Abstract

The invention discloses a carbon deposition prevention vehicle heating device heat exchanger and system.The carbon deposition prevention vehicle heating device heat exchanger comprises a heat exchanger shell, a plurality of fins, two main pipes and a plurality of branch pipes; the two ends of the heat exchanger shell are open, the fins are arranged in the heat exchanger shell side by side, each branch pipe penetrates through the fins and the two opposite wall faces of the heat exchanger shell, and the branch pipes are parallel. Gaps are formed between the adjacent fins, and fuel gas with heat generated by a vehicle heating device enters from the opening in one end of the heat exchanger shell, passes through the gaps of the fins and then is exhausted from the opening in the other end of the heat exchanger shell. The plurality of branch pipes are communicated outside the heat exchanger shell and are connected with the two main pipes, one main pipe is used for introducing a cooling working medium, and the other main pipe is used for discharging the cooling working medium; the fins are made of memory alloy and have a two-way memory effect; when the temperature of the fins is lower than the set temperature I, the fins are in a flat plate shape. When the temperature of the fins is higher than the set temperature II, the fins are in a wave shape, and the windward sections of the fins are in a wave shape. Deposition of smoke in the vehicle heating device in the high-altitude extremely cold environment can be reduced, the heat exchange efficiency is improved, and the flow loss is reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of vehicle heating, and in particular relates to a heat exchanger and a system of a vehicle heating device for preventing carbon deposits. Background Art

[0002] As the requirements for global adaptability gradually increase, heavy-duty vehicles face problems such as difficulty in starting the diesel power system and increased resistance in the transmission system in high-altitude and extremely cold environments. The vehicle heating device generates high-temperature combustion gas through the combustion system. The high-temperature combustion gas transfers heat to the engine coolant flowing through it through heat exchange in the heat exchange system, heating the vehicle power, transmission system and other parts to meet the needs of rapid vehicle starting in low-temperature and low-pressure environments.

[0003] The current vehicle heating device operates in a low-temperature and low-pressure environment. The combustion system experiences insufficient fuel atomization and fragmentation, insufficient combustion reaction, and other phenomena, resulting in an increase in the content of soot particles and unburned volatile hydrocarbons in the high-temperature fuel gas. These substances will be deposited on the surface of the heat exchanger pipes and fins in the heat exchange system, increasing the thermal resistance of the heat exchange, resulting in a decrease in the heat exchange efficiency, a decrease in the flow area, an increase in the flow resistance, and even blockage of the flow channel, resulting in an increase in the failure rate of the heating device and a decrease in its service life.

[0004] Therefore, in order to solve the problem that the heat exchange efficiency of the heat exchange system decreases and the flow loss increases due to the flue gas deposition in the vehicle heating device in the extremely cold environment at high altitude, it is necessary to propose a heat exchanger and system for the vehicle heating device that prevents carbon deposition. Summary of the invention

[0005] In view of this, the present invention provides a heat exchanger and system for a vehicle heating device that prevents carbon deposits, which can reduce the deposition of smoke in the vehicle heating device in an extremely cold environment at high altitudes, improve heat exchange efficiency, and reduce flow losses.

[0006] The present invention is achieved through the following technical solutions:

[0007] A heat exchanger for a vehicle heating device to prevent carbon deposition, comprising: a heat exchanger shell, a plurality of fins, two main pipes and a plurality of branch pipes;

[0008] The heat exchanger shell has openings at both ends, and a plurality of fins are arranged in parallel in the heat exchanger shell. Each branch pipe passes through a plurality of fins and two opposite walls of the heat exchanger shell, and the plurality of branch pipes are arranged in parallel. Gaps are arranged between adjacent fins, and the hot gas generated by the vehicle heating device enters through an opening at one end of the heat exchanger shell, passes through a plurality of gaps of a plurality of fins, and is discharged from an opening at the other end.

[0009] Several branch pipes are connected outside the heat exchanger shell and are connected to two main pipes, one main pipe is used for the cooling medium to flow in, and the other main pipe is used for the cooling medium to flow out;

[0010] The fins are made of memory alloy and have a two-way memory effect;

[0011] When the temperature of the fin is lower than the set temperature I, the fin becomes a flat plate;

[0012] When the temperature of the fin is higher than the set temperature II, the fin is wavy and the windward cross section of the fin is wavy.

[0013] Furthermore, when the temperature of the fin is higher than the set temperature II, the wave corners on the fin surface transition in an arc shape and are smooth and continuous everywhere.

[0014] Furthermore, when the fin is in a flat plate shape, the axis of each branch pipe is perpendicular to the fin; the branch pipes are arranged crosswise on the fin.

[0015] Further, it includes the heat exchanger and the gas side inlet channel;

[0016] The gas side inlet channel includes a gas inlet channel and an expansion section; the expansion section includes a large end and a small end, the small end is integrally connected with the gas channel, and the large end is butt-jointed with the gas inlet end of the heat exchanger;

[0017] The inner wall surface of the expansion section is rough, which can adsorb the soot particles in the fuel gas.

[0018] Furthermore, the roughness of the inner wall surface of the expansion section is Ra, 25 μm <Ra<100μm。

[0019] Beneficial effects:

[0020] (1) In the heat exchanger of the present invention, when the temperature of the fin is higher than the set temperature II, the fin is wavy, which increases the equivalent heat exchange area and effectively improves the heat exchange efficiency of the heat exchange system; when the temperature of the fin is lower than the set temperature I, the fin is flat, which can effectively inhibit the deposition of soot particles and volatile unburned hydrocarbons on the fins and extend the service life of the equipment.

[0021] (2) The wave corners on the fin surface of the present invention are arc-shaped transitions and are smooth and continuous everywhere, so as to reduce the deposition of soot particles on the fin surface.

[0022] (3) The inner wall surface of the expansion section of the heat exchange system of the present invention is rough, which can adsorb the soot particles in the fuel gas, thereby reducing the deposition of soot particles on the fin surface and improving the heat exchange efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of a heat exchanger for a vehicle heating device to prevent carbon deposits;

[0024] Figure 2 This is the schematic diagram of the structure of the windward side of the fin state Figure Ⅰ ;

[0025] Figure 3 This is the schematic diagram of the structure of the windward side of the fin state Figure II ;

[0026] Figure 4 It is a schematic diagram of the arrangement of fins and branch pipes;

[0027] Figure 5 It is a schematic diagram of a heat exchange system of a vehicle heating device for preventing carbon deposits;

[0028] Among them, 1-1-gas inlet channel, 1-2-expansion section, 1-3-sealing gasket I, 2-1-fin, 2-2-heat exchanger shell, 3-1-gas outlet channel, 3-2-sealing gasket II, 4-1-main pipe, 4-2-branch pipe. DETAILED DESCRIPTION

[0029] The present invention is described in detail below with reference to the accompanying drawings and embodiments.

[0030] Embodiment 1:

[0031] This embodiment provides a heat exchanger for a vehicle heating device to prevent carbon deposition, see the attached Figure 1 , including a heat exchanger shell 2-2, a plurality of fins 2-1, two main pipes 4-1 and a plurality of branch pipes 4-2;

[0032] The heat exchanger shell 2-2 has openings at both ends, and a plurality of fins 2-1 are arranged in parallel in the heat exchanger shell 2-2. Each branch pipe 4-2 is arranged through two opposite walls of the plurality of fins 2-1 and the heat exchanger shell 2-2, and the plurality of branch pipes 4-2 are parallel. Gaps are arranged between adjacent fins 2-1, and the hot gas generated by the vehicle heating device enters through an opening at one end of the heat exchanger shell 2-2, passes through a plurality of gaps of a plurality of fins 2-1, and is discharged from the opening at the other end.

[0033] A plurality of branch pipes 4-2 are connected outside the heat exchanger housing 2-2 and are connected to two main pipes 4-1. One main pipe 4-1 is used to introduce cooling medium, and the other main pipe 4-1 is used to discharge cooling medium, thereby realizing heat exchange and circulation of cooling medium to heat the vehicle;

[0034] Fin 2-1 is made of memory alloy and has a two-way memory effect;

[0035] See attached Figure 2 , when the temperature of fin 2-1 is lower than the set temperature I, fin 2-1 is in a flat plate shape;

[0036] See attached Figure 3 , when the temperature of the fin 2-1 is higher than the set temperature II, the fin 2-1 is wavy, and the windward cross section of the fin 2-1 is wavy;

[0037] The present embodiment provides a heat exchanger for a vehicle heating device that prevents carbon deposits. When the temperature of the fin 2-1 is higher than the set temperature II, the fin 2-1 is wavy, which increases the equivalent heat exchange area and effectively improves the heat exchange efficiency of the heat exchange system; when the temperature of the fin 2-1 is lower than the set temperature I, the fin 2-1 is flat, which can effectively inhibit the deposition of carbon soot particles and volatile unburned hydrocarbons on the fins and extend the service life of the equipment.

[0038] The aforementioned set temperature I is the martensitic transformation start temperature Ms, the set temperature II is the parent phase reverse transformation start temperature As, and As>Ms.

[0039] When the temperature of the fin 2-1 is higher than the set temperature II, the wave corners on the surface of the fin 2-1 are in an arc transition and are smooth and continuous everywhere. During processing, when the material of the fin 2-1 is in a high-temperature austenite phase, the fin is processed into a wave shape, and the convex or concave parts of the cross section are subjected to secondary compression and smoothing treatment to eliminate the sharp corner structure that is easy to deposit carbon, so that the wave corners on the surface of the fin 2-1 are in an arc transition and are smooth and continuous, so as to reduce the deposition of soot particles on the fin surface.

[0040] When the fin 2 - 1 is in a flat plate shape, the axis of each branch pipe 4 - 2 is perpendicular to the fin 2 - 1 .

[0041] In a specific embodiment, see the attached Figure 4 , the branch pipes 4-2 are arranged crosswise on the fins 2-1, see the attached Figure 1 , the branch pipes 4-2 are connected to each other, and the number of pipe passes is 2; the fluid flows back and forth in the connected branch pipes 4-2, which can improve the heat exchange efficiency. The inner diameter of the branch pipe 4-2 is 10-15mm, the thickness of the fin 2-1 is 0.15-0.3mm, and the distance between two adjacent fins 2-1 is 5-10mm;

[0042] Fin 2-1 processing process: When fin 2-1 is in the high-temperature austenite phase, the fin is processed into a "wavy shape", and the protrusions / depressions of the fin are subjected to secondary pressing and smoothing treatment to eliminate the sharp-angled structure that is prone to carbon deposition; in the low-temperature state, the fin is pressed into a flat plate for installation.

[0043] Working principle:

[0044] The high-temperature combustion gas generated by the vehicle heating device enters through an opening at one end of the heat exchanger shell 2-2, passes through a plurality of gaps in a plurality of fins 2-1, and is discharged from an opening at the other end; the heat of the high-temperature combustion gas is conducted through the fins 2-1 and the branch pipe 4-2, and is heat-exchanged with the cooling medium in the main pipe 4-1, and the cooling medium circulates to heat the vehicle.

[0045] In an extremely cold environment at high altitude, when the temperature of fin 2-1 is lower than the set temperature I, fin 2-1 is in a flat plate shape, which increases the equivalent heat exchange area and effectively improves the heat exchange efficiency of the heat exchange system.

[0046] When the flat-plate memory alloy fin 2-1 contacts the high-temperature gas, the fin temperature gradually rises. When the temperature of the fin 2-1 is higher than the set temperature II, the fin 2-1 deforms into a wave shape, thereby increasing the equivalent heat exchange area and effectively improving the heat exchange efficiency of the heat exchange system.

[0047] The cross-sectional shape of the memory alloy fin does not have a sharp corner structure before and after deformation, thereby reducing the deposition of soot particles on the fin surface.

[0048] Embodiment 2:

[0049] This embodiment provides a heat exchange system for a vehicle heating device to prevent carbon deposition based on the embodiment 1. Figure 5 , including the heat exchanger of the anti-carbon deposition vehicle heating device in Example 1, and also including a gas side inlet channel and a gas outlet channel 3-1;

[0050] The gas inlet channel is used for the air intake of the heat exchanger, and is connected to the air intake end of the heat exchanger through the flange and the sealing gasket Ⅰ1-3; the gas outlet channel 3-1 is used for the air outlet of the heat exchanger, and is connected to the air outlet end of the heat exchanger through the flange and the sealing gasket Ⅱ3-2;

[0051] The gas side inlet channel includes a gas inlet channel 1-1 and an expansion section 1-2; the expansion section 1-2 includes a large end and a small end, the small end is integrally connected with the gas channel 1-1, and the large end is connected with the gas inlet end of the heat exchanger;

[0052] The inner wall surface of the expansion section 1-2 is rough, which can adsorb soot particles in the fuel gas. Further, the roughness of the inner wall surface of the expansion section 1-2 is Ra, 25 μm <Ra<100μm。

[0053] The expansion section 1 - 2 of the gas-side inlet channel in this embodiment can perform preliminary adsorption of soot particles, which is beneficial to reducing the deposition of soot particles on the fin surface and improving heat exchange efficiency.

[0054] In a specific embodiment, the material of sealing gasket I1-3 and sealing gasket II3-2 is copper GB / T2040-T2060; the fin 2-1 is rectangular, and the cross-sections of the gas side inlet channel, the heat exchanger shell 2-2 and the gas outlet channel 3-1 are all rectangular. The rectangular design can avoid the pressure loss caused by the change of the flow channel cross-sectional shape, and avoid the increase in the length and volume of the heat exchanger caused by the increase in the rectifying section.

[0055] In summary, the above are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A heat exchanger for a vehicle heating device to prevent carbon deposition, characterized in that: include: It includes a heat exchanger shell, a plurality of fins, two main pipes and a plurality of branch pipes; The heat exchanger shell has openings at both ends, and a plurality of fins are arranged in parallel in the heat exchanger shell. Each branch pipe passes through a plurality of fins and two opposite walls of the heat exchanger shell, and the plurality of branch pipes are arranged in parallel. Gaps are arranged between adjacent fins, and the hot gas generated by the vehicle heating device enters through an opening at one end of the heat exchanger shell, passes through a plurality of gaps of a plurality of fins, and is discharged from an opening at the other end. Several branch pipes are connected outside the heat exchanger shell and are connected to two main pipes, one main pipe is used for the cooling medium to flow in, and the other main pipe is used for the cooling medium to flow out; The fins are made of memory alloy and have a two-way memory effect; When the temperature of the fin is lower than the set temperature I, the fin becomes a flat plate; When the temperature of the fin is higher than the set temperature II, the fin is wavy and the windward cross section of the fin is wavy.

2. The heat exchanger for a vehicle heating device to prevent carbon deposition as claimed in claim 1, characterized in that: When the temperature of the fin is higher than the set temperature II, the wave corners on the fin surface transition in an arc shape and are smooth and continuous everywhere.

3. A heat exchanger for a vehicle heating device to prevent carbon deposition as claimed in claim 1 or 2, characterized in that: When the fin is in a flat plate shape, the axis of each branch pipe is perpendicular to the fin; the branch pipes are arranged crosswise on the fin.

4. A heat exchange system for a vehicle heating device for preventing carbon deposits, based on a heat exchanger for a vehicle heating device for preventing carbon deposits as claimed in any one of claims 1 to 3, characterized in that: comprising the heat exchanger and a gas side inlet channel; The gas side inlet channel includes a gas inlet channel and an expansion section; the expansion section includes a large end and a small end, the small end is integrally connected with the gas channel, and the large end is butt-jointed with the gas inlet end of the heat exchanger; The inner wall surface of the expansion section is rough, which can adsorb the soot particles in the fuel gas.

5. A heat exchange system for a vehicle heating device to prevent carbon deposition as claimed in claim 4, characterized in that: The roughness of the inner wall of the expansion section is Ra, 25μm <Ra<100μm。

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