CN212429045U

CN212429045U - Pipe core for exhaust gas recirculation cooler

Info

Publication number: CN212429045U
Application number: CN202020104417.3U
Authority: CN
Inventors: 计海春
Original assignee: Yancheng Chunwei Chemical Machinery Equipment Co ltd
Current assignee: Yancheng Chunwei Environmental Protection Technology Co.,Ltd.
Priority date: 2020-01-17
Filing date: 2020-01-17
Publication date: 2021-01-29
Anticipated expiration: 2030-01-17

Abstract

The utility model relates to a waste gas recirculation cooler uses the tube core, when waste gas flows in first heat exchange tube and second heat exchange tube, can form spiral turbulent flow, has improved the heat transfer effect, and cooling water gets into in a plurality of cooling tubes through the inlet tube, and the low-temperature cooling water that gets into in the cooling tube takes away the heat after flowing through first heat exchange tube and second heat exchange tube outer wall, flows through the outlet pipe after reducing the temperature, guarantees that waste gas and cooling water can abundant heat transfer; meanwhile, cooling air enters the protective outer tube through the cooling air inlet, the cooling air entering the protective outer tube takes away heat after passing through the first heat exchange tube, the second heat exchange tube and the outer wall of the heat dissipation tube, and the cooling air further reduces the temperature and flows out through the air outlet. To because the intraductal good turbulent effect makes the unable deposit of particulate matter in the waste gas stream on the inner wall of first heat exchange tube and second heat exchange tube to the effectual carbon deposit phenomenon that has prevented takes place, can improve the heat transfer effect and the life of first heat exchange tube and second heat exchange tube greatly.

Description

Pipe core for exhaust gas recirculation cooler

Technical Field

The utility model relates to a cooler tube core technical field, concretely relates to tube core for exhaust gas recirculation cooler.

Background

Recently, in order to reduce the content of nitrogen oxides (NOx) in the exhaust gas of automobile engines, Exhaust Gas Recirculation (EGR) technology has been employed. The exhaust gas discharged after combustion in internal combustion engine (diesel engine, gasoline engine) is introduced into intake manifold, mixed with fresh air or atomized mixture and re-combusted in engine cylinder to reduce the content of nitrogen oxide (NOx). However, when a portion of the exhaust gas is mixed with fresh air or an atomized mixture, the temperature of the intake air is increased, which not only increases the combustion temperature to be disadvantageous in suppressing NOX generation, but also increases the thermal load of the engine to affect the durability of the engine. Therefore, it is necessary to pre-cool the exhaust gas passing through the EGR valve before mixing with fresh air, which requires the use of an EGR cooler. The EGR cooler cools the recirculating exhaust gases and thus lowers the temperature of the engine's combustion chambers without significantly reducing the engine's output power, thereby reducing the production of nitrogen oxides (NOx).

In the early exhaust gas recirculation cooler, a stainless steel pipe having smooth inner and outer surfaces is used, and when exhaust gas discharged from an engine passes through the stainless steel pipe having smooth inner and outer surfaces, heat of the exhaust gas is dissipated, but since the exhaust gas flows in a straight line in the smooth stainless steel pipe, the heat dissipation efficiency is low, and by increasing the number of the smooth pipes, although the heat exchange area can be increased, the cooler has a large and heavy volume and is relatively expensive to manufacture and install. In view of the above, it is desirable to design a core for an EGR cooler.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a tube core for exhaust gas recirculation cooler to solve the problem that proposes among the above-mentioned background art.

In order to achieve the above object, the utility model provides a following technical scheme: a tube core for an exhaust gas recirculation cooler comprises a first heat exchange tube, a second heat exchange tube, a threaded cap and a protective outer tube, wherein the first heat exchange tube and the second heat exchange tube are arranged in the protective outer tube, a cooling air inlet is arranged below the protective outer tube, a sealing spiral ring is arranged at the periphery of the cooling air inlet, the cooling air inlet is in welded connection with the protective outer tube, the cooling air inlet is movably connected with the sealing spiral ring, an air outlet is arranged above the protective outer tube, the protective outer tube is fixedly connected with the air outlet, the threaded cap is arranged on each of two sides of the protective outer tube, a sealing ring is arranged on the inner side of the threaded cap, the protective outer tube is in threaded connection with the threaded cap, the threaded cap is movably connected with the sealing ring, the threaded structure of the threaded cap is matched with the threaded structure of the protective outer tube, and an embedded structure is arranged between the threaded cap and the, and two ends of the first heat exchange tube and the second heat exchange tube penetrate through the threaded covers and extend out of the threaded covers.

Preferably, the interval is provided with a plurality of cooling tubes, every on first heat exchange tube and the second heat exchange tube the cooling tube is 8 style of calligraphy pipes to form by a cavity pipeline is buckled, every be provided with water inlet and delivery port on the cooling tube respectively, folding department keeps apart the cooling tube into first cavity and second cavity in the middle of the cooling tube.

Preferably, a first heat exchange tube is arranged in the first cavity, and a second heat exchange tube is arranged in the second cavity.

Preferably, the middle folding part of the radiating pipe is a triangular area, and a welding block with a regular triangle section is added in the triangular area.

Preferably, it is a plurality of water inlet on the cooling tube all communicates through the inlet tube, the one end of inlet tube is passed the screw cap and is stretched out the screw cap, and is a plurality of delivery port on the cooling tube all communicates through the outlet pipe, the one end of outlet pipe is passed the screw cap and is stretched out the screw cap, and the sealing washer is filled the space between screw cap and inlet tube, the outlet pipe.

Preferably, the tube walls of the first heat exchange tube and the second heat exchange tube are provided with a plurality of grooves, and the grooves are arranged in an intermittent staggered manner.

Compared with the prior art, the pipe core for the exhaust gas recirculation cooler has the advantages that when exhaust gas flows in the first heat exchange pipe and the second heat exchange pipe, spiral turbulent flow can be formed, the heat exchange effect is improved, cooling water enters the plurality of heat exchange pipes through the water inlet pipe, low-temperature cooling water entering the heat exchange pipes takes away heat after flowing through the outer walls of the first heat exchange pipe and the second heat exchange pipe, the temperature is reduced, the cooling water flows out through the water outlet pipe, and the exhaust gas and the cooling water can be ensured to be subjected to sufficient heat exchange; meanwhile, cooling air enters the protective outer tube through the cooling air inlet, the cooling air entering the protective outer tube takes away heat after passing through the first heat exchange tube, the second heat exchange tube and the outer wall of the heat dissipation tube, and the cooling air further reduces the temperature and flows out through the air outlet. To because the intraductal good turbulent effect makes the unable deposit of particulate matter in the waste gas stream on the inner wall of first heat exchange tube and second heat exchange tube to the effectual carbon deposit phenomenon that has prevented takes place, can improve the heat transfer effect and the life of first heat exchange tube and second heat exchange tube greatly.

Drawings

The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention, and together with the description, do not constitute a limitation of the invention, in which:

FIG. 1 is a schematic structural view of a tube core for an EGR cooler of the present invention;

FIG. 2 is a schematic view of a heat pipe structure in a core of an EGR cooler of the present invention;

fig. 3 is a schematic diagram of a first heat exchange tube structure in a tube core for an egr cooler according to the present invention.

In the drawings:

1. a first heat exchange tube; 2. a second heat exchange tube; 3. a threaded cap; 4. a seal ring; 5. a protective outer tube; 6. a radiating pipe; 7. a cooling air inlet; 8. sealing the spiral ring; 9. an air outlet; 10. a water inlet; 11. a water outlet; 12. a first cavity; 13. a second cavity; 14. welding blocks; 15. a water inlet pipe; 16. a water outlet pipe; 17. and (4) a groove.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1-3, the present invention provides a technical solution: a tube core for an exhaust gas recirculation cooler comprises a first heat exchange tube 1, a second heat exchange tube 2, a threaded cap 3 and a protective outer tube 5, wherein the protective outer tube 5 is internally provided with the first heat exchange tube 1 and the second heat exchange tube 2, a cooling air inlet 7 is arranged below the protective outer tube 5, a sealing spiral ring 8 is arranged on the periphery of the cooling air inlet 7, the cooling air inlet 7 is in welded connection with the protective outer tube 5, the cooling air inlet 7 is movably connected with the sealing spiral ring 8, an air outlet 9 is arranged above the protective outer tube 5, the protective outer tube 5 is fixedly connected with the air outlet 9, threaded caps 3 are arranged on two sides of the protective outer tube 5, a sealing ring 4 is arranged on the inner side of each threaded cap 3, the protective outer tube 5 is in threaded connection with the threaded caps 3, and the threaded caps 3 are movably connected with the sealing rings 4, the thread structure of the thread cover 3 is matched with the thread structure of the protective outer tube 5, the thread cover 3 and the sealing ring 4 are of a nested structure, and two ends of the first heat exchange tube 1 and the second heat exchange tube 2 penetrate through the thread cover 3 and extend out of the thread cover 3. The screw cap 3 is rotated clockwise, the screw cap and the protective outer tube 5 are fixed, the first heat exchange tube 1 and the second heat exchange tube 2 can be replaced conveniently by using the screw cap 3, waste caused by damage of the first heat exchange tube 1 and the second heat exchange tube 2 is prevented, the replacement cost of the cooler is saved, the working benefit of the cooler is improved, and meanwhile, the sealing ring 4 fills the gap between the screw cap 3 and the first heat exchange tube 1 as well as the gap between the first heat exchange tube 2 and the second heat exchange tube 2.

In this embodiment, interval is provided with a plurality of cooling tubes 6 on first heat exchange tube 1 and the second heat exchange tube 2, every cooling tube 6 is 8 style of calligraphy pipes to form by a cavity pipeline is buckled, every be provided with water inlet 10 and delivery port 11 on the cooling tube 6 respectively, 6 middle folding departments of cooling tube keep apart cooling tube 6 for first cavity 12 and second cavity 13, such setting is equivalent to linking together two circular cooling tubes, and such radiating effect is better, and is easily fixed, the installation of being convenient for. The heat radiating pipe is characterized in that a first heat exchange pipe 1 is arranged in the first cavity 12, a second heat exchange pipe 2 is arranged in the second cavity 13, a triangular area is arranged at the middle folding position of the heat radiating pipe 6, and a welding block 14 with a regular triangle-shaped cross section is added in the triangular area.

In this embodiment, a plurality of water inlets 10 on the cooling tube 6 are all communicated through the water inlet tube 15, the one end of the water inlet tube 15 passes through the screw cap 3 and stretches out the screw cap 3, a plurality of water outlets 11 on the cooling tube 6 are all communicated through the water outlet tube 16, the one end of the water outlet tube 16 passes through the screw cap 3 and stretches out the screw cap 3, and the sealing ring 4 fills the gap between the screw cap 3 and the water inlet tube 15, the water outlet tube 16.

In this embodiment, the first heat exchange tube 1 and the second heat exchange tube 2 have a plurality of grooves 17 on the tube wall, and the plurality of grooves 17 are intermittently and alternately arranged, so as to form a spiral effect. In order to ensure that the first heat exchange tube 1 and the second heat exchange tube 2 have the largest possible turbulent flow area and simultaneously reduce the resistance of the ridges in the tubes to the waste gas as much as possible, through theoretical calculation and experiments, the rotation direction angle theta of the grooves on the first heat exchange tube 1 and the second heat exchange tube 2 can be selected between 15 degrees and 90 degrees, and the groove pitch P can be selected between 6mm and 15 mm. The first heat exchange tube 1 and the second heat exchange tube 2 are pressed with U-shaped grooves at the outer sides, and the depth H of the grooves can be between 0.4mm and 0.8 mm.

The working principle is as follows: when the waste gas flows in the first heat exchange tube 1 and the second heat exchange tube 2, spiral turbulence can be formed, the heat exchange effect is improved, cooling water enters the plurality of radiating tubes 6 through the water inlet tube 15, low-temperature cooling water entering the radiating tubes 6 takes heat away after flowing through the outer walls of the first heat exchange tube 1 and the second heat exchange tube 2, the temperature is reduced, and the low-temperature cooling water flows out through the water outlet tube 16, so that the waste gas and the cooling water can be ensured to be subjected to sufficient heat exchange; meanwhile, cooling air enters the protective outer tube 5 through the cooling air inlet 7, the cooling air entering the protective outer tube 5 takes away heat after passing through the outer walls of the first heat exchange tube 1, the second heat exchange tube 2 and the radiating tube 6, and the cooling air further reduces the temperature and flows out through the air outlet 9. To because the intraductal good turbulent effect makes the unable deposit of particulate matter in the waste gas stream on the inner wall of first heat exchange tube 1 and second heat exchange tube 2 to the effectual carbon deposit phenomenon that has prevented takes place, can improve the heat transfer effect and the life of first heat exchange tube 1 and second heat exchange tube 2 greatly.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a pipe core for exhaust gas recirculation cooler, includes first heat exchange tube (1), second heat exchange tube (2), screw cap (3) and protection outer tube (5), its characterized in that: the heat exchanger is characterized in that a first heat exchange tube (1) and a second heat exchange tube (2) are arranged in the protective outer tube (5), a cooling air inlet (7) is installed below the protective outer tube (5), a sealing spiral ring (8) is installed on the periphery of the cooling air inlet (7), the cooling air inlet (7) is in welded connection with the protective outer tube (5), the cooling air inlet (7) is movably connected with the sealing spiral ring (8), an air outlet (9) is installed above the protective outer tube (5), the protective outer tube (5) is fixedly connected with the air outlet (9), threaded caps (3) are arranged on two sides of the protective outer tube (5), sealing rings (4) are installed on the inner sides of the threaded caps (3), the protective outer tube (5) is in threaded connection with the threaded caps (3), and the threaded caps (3) are movably connected with the sealing rings (4), the thread structure of the thread cover (3) is matched with the thread structure of the protective outer tube (5), the thread cover (3) and the sealing ring (4) are of an embedded structure, and the two ends of the first heat exchange tube (1) and the second heat exchange tube (2) penetrate through the thread cover (3) and extend out of the thread cover (3).

2. The die for an egr cooler of claim 1, wherein: the heat exchanger is characterized in that a plurality of radiating pipes (6) are arranged on the first heat exchange pipe (1) and the second heat exchange pipe (2) at intervals, each radiating pipe (6) is an 8-shaped pipe and is formed by bending a hollow pipeline, each radiating pipe (6) is provided with a water inlet (10) and a water outlet (11), and the middle folding part of each radiating pipe (6) isolates the radiating pipe (6) into a first cavity (12) and a second cavity (13).

3. The die for an egr cooler of claim 2 wherein: a first heat exchange tube (1) is arranged in the first cavity (12), and a second heat exchange tube (2) is arranged in the second cavity (13).

4. The die for an egr cooler of claim 2 wherein: the middle folding part of the radiating pipe (6) is a triangular area, and a welding block (14) with a regular triangle section is added in the triangular area.

5. The die for an egr cooler of claim 2 wherein: a plurality of water inlet (10) on cooling tube (6) all communicate through inlet tube (15), the one end of inlet tube (15) is passed screw cap (3) and is stretched out screw cap (3), and is a plurality of delivery port (11) on cooling tube (6) all communicate through outlet pipe (16), the one end of outlet pipe (16) is passed screw cap (3) and is stretched out screw cap (3), and sealing washer (4) are filled screw cap (3) and inlet tube (15), the space between outlet pipe (16).

6. The die for an egr cooler of claim 1, wherein: the tube walls of the first heat exchange tube (1) and the second heat exchange tube (2) are provided with a plurality of grooves (17), and the grooves (17) are arranged in an intermittent staggered manner.