CN116480496A

CN116480496A - EGR cooler

Info

Publication number: CN116480496A
Application number: CN202310507432.0A
Authority: CN
Inventors: 姚建华; 徐磊
Original assignee: Wuxi Aiqite Auto Environmental Protection Technology Co ltd
Current assignee: Wuxi Aiqite Auto Environmental Protection Technology Co ltd
Priority date: 2023-05-06
Filing date: 2023-05-06
Publication date: 2023-07-25

Abstract

The invention relates to an EGR cooler which comprises a shell, an air inlet cover, an air outlet cover and cooling pipes, wherein two ends of the shell are connected with mounting plates, the cooling pipes are provided with a plurality of cooling pipes and penetrate through the two mounting plates, the air inlet cover is connected with one end of the shell, the air outlet cover is connected with the other end of the shell, the surface of the shell is connected with a water inlet pipe and a water outlet, the water inlet pipe is arranged at a position, close to the air outlet cover, of the shell, a heating assembly is arranged in the water inlet pipe, the heating assembly comprises a first heating wire and a controller, the first heating wire is connected to the outer wall of the water inlet pipe, the heating temperature of the first heating wire is lower than the temperature of exhaust gas, a heat preservation cover is arranged on the outer wall of the water inlet pipe, the first heating wire is positioned in the heat preservation cover, and the controller is connected to the surface of the shell and is electrically connected with the controller. The invention improves the cooling effect of the cooler.

Description

EGR cooler

Technical Field

The invention relates to the technical field of coolers, in particular to an EGR cooler.

Background

The cooler is a device for cooling part of the exhaust gases returned to the cylinders of the engine. In order to reduce the nitrogen oxides content in the exhaust gases of automobiles, it is necessary to return a part of the exhaust gases to the engine cylinders, the exhaust gas temperature being as high as 600 ℃, which must be cooled down before entering the engine intake system, and thus an exhaust gas recirculation cooler is created.

Chinese patent publication No. CN112577341a discloses a cast shell type EGR cooler, in which an air inlet joint is connected with a telescopic structure with a bellows and a sleeve, the outer circumference of the telescopic structure is fixedly connected with an input end flange cover, the input end flange cover is connected with one end of a cast tube shell through an input end sealing gasket, and the other end of the tube shell is connected with a fixed structure and an output end flange cover with an output tube joint through an output end sealing ring; the telescopic structure is welded with the tube plate at one end of the tube bundle, and the tube plate at the other end of the tube bundle is welded with the fixed structure. According to the invention, the fixed structure is arranged at one end of the tube bundle, the flexible structure of the double-layer corrugated tube is utilized in the telescopic structure to compensate the axial displacement of the heat exchange core body, the influence of heat expansion and cold contraction on the heat exchange core body is reduced, the double-layer corrugated tube is arranged at the air inlet end, and the water flow space is increased by combining the water inlet pipe structure of the shell, so that the water flow uniformity is ensured.

With respect to the above related art, the inventor considers that the exhaust gas in the tube bundle in the prior art is chilled and liquefied, the higher the temperature difference between the coolant and the exhaust gas is, the easier the exhaust gas is liquefied, the exhaust gas will appear in the tube bundle in the form of water droplets, the water droplets stay in the tube bundle and absorb heat when encountering the high-temperature exhaust gas, and condensate will be attached to the inner wall of the tube bundle, which is the cause of carbon deposition, the tube bundle is easy to be blocked when the cooler is used for a long time, the position of the tube bundle close to the water inlet pipe is preferentially contacted with the cooling water, and the temperature of the cooling water is the lowest when the tube bundle is close to the water inlet pipe, so the liquefied position of the exhaust gas is concentrated in the region of the cooling tube close to the water inlet pipe, thereby reducing the cooling effect of the cooler.

Disclosure of Invention

In order to improve the cooling effect of the cooler, the application provides an EGR cooler.

The application provides an EGR cooler which adopts the following technical scheme:

the utility model provides an EGR cooler, includes casing, inlet hood, play gas hood and cooling tube, the both ends of casing all are connected with the mounting panel, the cooling tube is provided with a plurality of roots, and all wears to establish between two the mounting panel, the inlet hood is connected the one end of casing, it connects to go out the gas hood the other end of casing, the casing surface is connected with inlet tube and delivery port, the inlet tube sets up the casing is close to the position department of gas hood, be provided with heating element in the inlet tube, heating element includes first heater strip and controller, first heater strip is connected on the outer wall of inlet tube, the heating temperature of first heater strip is less than exhaust gas temperature, be provided with the heat preservation cover on the inlet tube outer wall, first heater strip is located in the heat preservation cover, the controller is connected the casing surface, the heater strip with the controller electricity is connected.

Through adopting above-mentioned technical scheme, when the coolant liquid of needs heating, the staff utilizes the first heating wire of controller circular telegram, makes first heating wire produce heat and transmits for on the pipe wall of inlet tube, before the coolant liquid gets into the casing with the inlet tube heat exchange of being heated from the inlet tube, has realized the effect of heating the coolant liquid. The temperature of the first heating wire is controlled by a controller to control the temperature of the cooling liquid, the heated cooling liquid contacts the cooling pipe, and the temperature difference between the cooling liquid and the high-temperature waste gas is reduced through heat exchange between the cooling pipe and the high-temperature waste gas, so that the possibility of liquefying the high-temperature waste gas in the cooling pipe is reduced, the accumulation of carbon deposition is reduced, the cooling pipe is kept smooth as much as possible, and the cooling effect of the cooler is improved.

Optionally, the cooling tube slope sets up, the cooling tube be close to the height that the air inlet cover one end is higher than the cooling tube is close to the height of cover one end of giving vent to anger, be connected with the collecting box of collecting waste gas liquid on the cover of giving vent to anger.

By adopting the technical scheme, the liquefaction of the high-temperature waste gas in the cooling pipe cannot be avoided, and the liquefied waste gas flows along the inclined direction of the cooling pipe until entering the collecting box, so that the possibility that the liquefied waste gas stays in the cooling pipe is reduced, and the occurrence of carbon deposition is further reduced.

Optionally, a second heating wire is connected to the mounting plate near the air outlet cover, a waterproof tube is wrapped on the surface of the second heating wire, the second heating wire is electrically connected to the controller, and the working temperature of the second heating wire is lower than the temperature of the waste gas.

Through adopting above-mentioned technical scheme, the staff passes through the second heater strip of controller circular telegram, makes the second heater strip produce heat to on giving the mounting plate that is close to the cover of giving vent to anger with heat transfer, make the cooling tube be heated in the region near this mounting plate, with this, shortened the temperature difference between cooling tube and the high temperature waste gas in this region, further reduced the possibility of high temperature waste gas liquefaction.

Optionally, the gas outlet cover is round platform form setting, the gas outlet end diameter of gas outlet cover is less than the inlet end diameter, it has the collecting vat to open on the gas outlet cover inner wall, be connected with the guide ring on the gas outlet cover inner wall, the guide ring is used for guiding in the cooling tube waste gas liquid flows to in the collecting vat, the lowest department of collecting vat is opened there is the collecting hole, the collecting hole intercommunication the collecting box.

Through adopting above-mentioned technical scheme, because the influence of waste gas liquefaction, high temperature waste gas has steam through the cooling tube after, and the cover round platform setting of giving vent to anger makes more high temperature waste gas and the inner wall contact of cover of giving vent to anger to this waste gas contacts the cover of giving vent to anger after, and steam in the waste gas adheres to on the cover of giving vent to anger, gathers to the lowest department of collecting vat after forming liquid to in the collecting box through the collecting hole inflow collecting box at last, realized the effect of automatic collection liquefaction waste gas.

Optionally, the collecting box connect in the lowest department on cover surface gives vent to anger, be connected with the overflow pipe on the collecting box, the overflow pipe slope sets up, be provided with the shutoff gas liquid in the collecting box, the overflow pipe water inlet end highly be less than the overflow pipe water outlet end highly, just the overflow pipe water inlet end is located the shutoff gas liquid.

Through adopting above-mentioned technical scheme, waste gas exists and gets into the possibility in the collecting box from the collecting hole, and the shutoff gas-liquid is used for preventing waste gas from leaking from overflow pipe department, and the shutoff gas-liquid receives the convergence of liquefied waste gas simultaneously, and the surface of water rises, when arriving overflow pipe highest department, flows from the overflow pipe.

Optionally, the surface of the air outlet cover is connected with a plurality of heat dissipation annular plates.

Through adopting above-mentioned technical scheme, the heat dissipation annular plate is used for increasing the radiating area of gas hood, makes the gas hood maintain in certain temperature range to this, more is favorable to the heat exchange of waste gas and the collection of steam in the waste gas, has reduced more steam and has wafted out the gas hood and mix with combustible gas mixture, influences the possibility that combustible gas mixture burns at the combustion chamber.

Optionally, an activated carbon net is installed at the air outlet end of the air inlet cover.

By adopting the technical scheme, the active carbon net is used for adsorbing water vapor and toxic substances in the waste gas, so that components of the water vapor and the toxic substances in the waste gas are reduced.

Optionally, the water outlet end of the water inlet pipe is communicated with the lowest part of the inner wall of the shell, a plurality of spiral arc plates are connected to the inner wall of the shell, mounting holes are formed in the spiral arc plates, and the cooling pipe penetrates through the mounting holes.

By adopting the technical scheme, in order to save the cost, the cooling liquid in the cooler can be used for a long time generally, however, the cooling liquid can also generate scale when being heated (the scale amount generated by the cooling liquid is far less than that generated by water), and the higher the temperature is, the faster the scale is generated, so that the scale is extremely easy to form on the surface of the cooling pipe, and after the cooler is used for a long time, the heat exchange of waste gas can be influenced by the scale covering the cooling pipe, so that the cooling effect of the cooler is reduced. The staff communicates the water outlet end of inlet tube in shells inner wall's lowest department to this, when injecting into the coolant liquid, the coolant liquid because inertia, can flow along shells inner wall's circumference direction, then receive the direction of spiral arc board, make the coolant liquid flow along spiral arc board's direction, form spiral rivers, with this scouring cooling tube surface, and increased the velocity of flow of coolant liquid, the cooperation of both has delayed the time of incrustation scale adhesion cooling tube surface, has reduced the washing number of times of cooler, has improved the cooling efficiency of cooler. The spiral arc plate is also used for supporting the cooling pipe, so that the possibility that liquefied waste gas stays in the cooling pipe due to deformation of the middle position of the cooling pipe caused by expansion caused by heat and contraction caused by cold is reduced.

In summary, the present application includes at least one of the following beneficial technical effects:

1. when the cooling liquid is required to be heated, a worker uses the controller to electrify the first heating wire, so that the first heating wire generates heat and transfers the heat to the pipe wall of the water inlet pipe, and the cooling liquid exchanges heat with the heated water inlet pipe before entering the shell from the water inlet pipe, thereby realizing the effect of heating the cooling liquid. The temperature of the first heating wire is controlled by a controller to control the temperature of the cooling liquid, the heated cooling liquid contacts the cooling pipe, and the temperature difference between the cooling liquid and the high-temperature waste gas is reduced through heat exchange between the cooling pipe and the high-temperature waste gas, so that the possibility of liquefying the high-temperature waste gas in the cooling pipe is reduced, the accumulation of carbon deposit is reduced, the cooling pipe is kept smooth as much as possible, and the cooling effect of the cooler is improved;

2. the staff communicates the water outlet end of inlet tube in shells inner wall's lowest department to this, when injecting into the coolant liquid, the coolant liquid because inertia, can flow along shells inner wall's circumference direction, then receive the direction of spiral arc board, make the coolant liquid flow along spiral arc board's direction, form spiral rivers, with this scouring cooling tube surface, and increased the velocity of flow of coolant liquid, the cooperation of both has delayed the time of incrustation scale adhesion cooling tube surface, has reduced the washing number of times of cooler, has improved the cooling efficiency of cooler. The spiral arc plate is also used for supporting the cooling pipe, so that the possibility that liquefied waste gas stays in the cooling pipe due to deformation of the middle position of the cooling pipe caused by expansion caused by heat and contraction caused by cold is reduced.

Drawings

Fig. 1 is a schematic view of an overall structure of an EGR cooler in an embodiment of the present application.

Fig. 2 is an enlarged view at a in fig. 1.

Fig. 3 is a cross-sectional view for embodying the internal structure of the cooler in the embodiment of the present application.

Fig. 4 is a cross-sectional view of an embodiment of the present application for illustrating the position of a water intake pipe.

Fig. 5 is a cross-sectional view of an embodiment of the present application for embodying a gas cap structure.

Reference numerals illustrate: 1. a housing; 11. a water inlet pipe; 12. a water outlet; 13. a spiral arc plate; 2. an air inlet cover; 3. an air outlet cover; 31. an activated carbon net; 32. a heat dissipation annular plate; 33. a collection tank; 34. a collection hole; 35. a guide ring; 4. a cooling tube; 41. a mounting plate; 5. a heating assembly; 51. a first heating wire; 511. a thermal insulation cover; 52. a controller; 6. a second heating wire; 7. a collection box; 71. and (3) an overflow pipe.

Detailed Description

The present application is described in further detail below in conjunction with figures 1-5.

The embodiment of the application discloses an EGR cooler. Referring to fig. 1, 2 and 3, an EGR cooler comprises a housing 1, an inlet cowl 2, an outlet cowl 3 and a cooling duct 4. The casing 1 sets up to the cylinder, and the both ends of casing 1 all have mounting panel 41 through bolted connection, and cooling tube 4 is provided with a plurality of roots, and all wears to locate between two mounting panels 41. The cooling tube 4 is obliquely arranged, the inclination angle of the cooling tube 4 in the embodiment is 1 degree, and the height of the air inlet end of the cooling tube 4 is higher than that of the air outlet end. The air inlet cover 2 and the air outlet cover 3 are connected to the shell 1 through flanges.

Referring to fig. 1, 3 and 4, a water inlet pipe 11 and a water outlet 12 are fixedly connected to the surface of the shell 1, the water outlet end of the water inlet pipe 11 is communicated with the lowest position of the inner wall of the shell 1, and the water inlet end of the water outlet 12 is communicated with the highest position of the inner wall of the shell 1. A plurality of spiral arc plates 13 are fixedly connected to the inner wall of the shell 1, mounting holes are formed in the spiral arc plates 13 at positions corresponding to the cooling pipes 4, and the cooling pipes 4 are mounted in the mounting holes. The cooperation of the inlet pipe 11 with the spiral arc plate 13 serves to form a spiral flow of the cooling liquid, increasing the flow rate of the cooling liquid to flush the surface of the cooling pipe 4. The spiral arc plate 13 also serves to assist in supporting the cooling tube 4.

Referring to fig. 1 and 2, the water inlet pipe 11 is provided with a heating assembly 5, the heating assembly 5 includes a first heating wire 51 and a controller 52, the first heating wire 51 is wound on the surface of the water inlet pipe 11, and the working temperature of the first heating wire 51 is lower than the temperature of the exhaust gas, and this embodiment is exemplified by 90 degrees. The heat preservation cover 511 is fixedly connected to the surface of the water inlet pipe 11, and the first heating wire 51 is located in the heat preservation cover 511. The controller 52 is installed on the surface of the housing 1, and the first heating wire 51 is electrically connected to the controller 52.

When the cooling liquid is heated, a worker uses the controller 52 to electrify the first heating wire 51, so that the first heating wire 51 generates heat and transmits the heat to the pipe wall of the water inlet pipe 11, and the cooling liquid exchanges heat with the heated water inlet pipe 11 before entering the shell 1 from the water inlet pipe 11, thereby realizing the effect of heating the cooling liquid.

Referring to fig. 3 and 4, a plurality of second heating wires 6 are fixedly connected to the mounting plate 41 near the air outlet cover 3, the second heating wires 6 are electrically connected to the controller 52, the working temperature of the second heating wires 6 is lower than the temperature of the exhaust gas, in this embodiment, a water-proof pipe is wrapped on the surface of the second heating wires 6 by taking 90 degrees as an example. The second heating wire 6 is used for heating the area of the cooling tube 4 close to the inlet cowl 2.

Referring to fig. 5, the air outlet cover 3 is provided in a truncated cone shape, and the air inlet end of the air outlet cover 3 is close to the housing 1. The air outlet end of the air outlet cover 3 is provided with a mounting groove, an active carbon net 31 is connected in the mounting groove through bolts, and the active carbon net 31 is used for adsorbing water vapor and toxic substances in waste gas. The surface of the air outlet cover 3 is fixedly connected with a plurality of heat dissipation annular plates 32, and the heat dissipation annular plates 32 are used for increasing the heat dissipation area of the air outlet cover 3. The cooperation of the heat dissipation ring plate 32 and the circular truncated cone-shaped air outlet cover 3 is beneficial to heat exchange of the waste gas and collection of water vapor in the waste gas.

Referring to fig. 5, a collecting groove 33 is formed on the inner wall of the gas outlet cover 3, a collecting hole 34 is formed at the lowest part of the collecting groove 33, a guiding ring 35 is fixedly connected to the inner wall of the gas outlet cover 3, and the guiding ring 35 is used for guiding the liquefied waste gas in the cooling pipe 4 to flow into the collecting groove 33. The lowest part of the outer surface of the air outlet cover 3 is fixedly connected with a collecting box 7, and a collecting hole 34 is communicated with the collecting box 7. The surface of the collecting box 7 is fixedly connected with an overflow pipe 71, the overflow pipe 71 is obliquely arranged, and the water outlet end of the overflow pipe 71 is higher than the water inlet end. The collection box 7 is internally provided with a gas-liquid blocking, the water inlet end of the overflow pipe 71 is lower than the horizontal plane of the gas-liquid blocking, and the gas-liquid blocking is used for preventing the exhaust gas from leaking from the overflow pipe 71.

The exhaust gas liquefied in the cooling pipe 4 flows into the collecting tank 33 through the guide ring 35, the exhaust gas flowing out of the cooling pipe 4 encounters the inner wall of the gas outlet cover 3, so that water vapor is attached to the bottom wall of the collecting tank 33, and finally is drained into the collecting tank 7 through the collecting hole 34, and when the gas blocking liquid level in the collecting tank 7 is higher than the water outlet end of the overflow pipe 71, the gas blocking liquid flows out of the overflow pipe 71.

The implementation principle of the EGR cooler in the embodiment of the application is as follows: when the high-temperature waste gas needs to be cooled, the working personnel introduce the waste gas into the air inlet hood 2, the waste gas enters the cooling pipe 4, the waste gas transfers heat to the cooling pipe 4, the first heating wire 51 is electrified through the controller 52, then the cooling liquid enters the shell 1 through the water inlet pipe 11, in the process, the cooling liquid is heated and warmed, flows along the direction of the spiral arc plate 13, exchanges heat with the cooling pipe 4, part of the waste gas after heat exchange begins to liquefy and appears in the form of water drops, flows out of the cooling pipe 4 along the direction of the cooling pipe 4 and enters the cooling tank, meanwhile, the waste gas with water vapor drifts out of the cooling pipe 4 and then meets the inner wall of the air outlet hood 3, part of the waste gas liquefies and cools again, the liquefied waste gas gathers more on the bottom wall of the collecting tank 33, finally flows into the collecting box 7 through the collecting hole 34, toxic substances and residual water vapor in the cooled waste gas are adsorbed by the activated carbon net 31, and then the waste gas flows out of the air outlet hood 3, and the effect of cooling the waste gas is achieved.

The temperature of the first heating wire 51 is controlled by a worker by using the controller 52 to control the temperature of the cooling liquid, the heated cooling liquid contacts the cooling pipe 4, and the temperature difference between the cooling liquid and the high-temperature exhaust gas is reduced by heat exchange between the cooling pipe 4 and the high-temperature exhaust gas, so that the possibility of liquefying the high-temperature exhaust gas in the cooling pipe 4 is reduced, the accumulation of carbon deposition is reduced, the cooling pipe 4 is kept smooth as much as possible, and the cooling effect of the cooler is improved.

The foregoing are all preferred embodiments of the present application, and are not intended to limit the scope of the present application in any way, therefore: all equivalent changes in structure, shape and principle of this application should be covered in the protection scope of this application.

Claims

1. The utility model provides an EGR cooler, includes casing (1), inlet hood (2), outlet hood (3) and cooling tube (4), the both ends of casing (1) all are connected with mounting panel (41), cooling tube (4) are provided with a plurality of roots, and all wear to establish between two mounting panel (41), inlet hood (2) are connected one end of casing (1), outlet hood (3) are connected the other end of casing (1), casing (1) surface connection has inlet tube (11) and delivery port (12), its characterized in that: inlet tube (11) set up casing (1) are close to the position department of cover (3) of giving vent to anger, be provided with heating element (5) in inlet tube (11), heating element (5) are including first heater strip (51) and controller (52), first heater strip (51) are connected on the outer wall of inlet tube (11), the heating temperature of first heater strip (51) is less than exhaust gas temperature, be provided with thermal insulation cover (511) on inlet tube (11) outer wall, first heater strip (51) are located in thermal insulation cover (511), controller (52) are connected casing (1) surface, the heater strip with controller (52) electricity is connected.

2. An EGR cooler according to claim 1, characterized in that: the cooling tube (4) is obliquely arranged, the height of the cooling tube (4) close to one end of the air inlet cover (2) is higher than the height of the cooling tube (4) close to one end of the air outlet cover (3), and the air outlet cover (3) is connected with a collecting box (7) for collecting waste gas and liquid.

3. An EGR cooler according to claim 2, characterized in that: be close to be connected with second heater strip (6) on mounting panel (41) of cover (3) give vent to anger, second heater strip (6) surface parcel has the waterproof pipe, second heater strip (6) electric connect in controller (52), the operating temperature of second heater strip (6) is less than exhaust gas temperature.

4. An EGR cooler according to claim 3, characterized in that: the utility model discloses a cooling device for the gas turbine, including cooling tube (4), gas hood (3), collecting tank (7) and collecting tank (34), gas hood (3) are round platform form setting, the gas end diameter that gives vent to anger of gas hood (3) is less than the gas inlet end diameter, it has collecting tank (33) to open on the gas hood (3) inner wall, be connected with guide ring (35) on gas hood (3) inner wall, guide ring (35) are used for the guide in cooling tube (4) waste gas liquid flows to in collecting tank (33), collecting hole (34) are opened to the lowest department of collecting tank (33), collecting hole (34) intercommunication collecting tank (7).

5. An EGR cooler according to claim 4, characterized in that: the collecting box (7) is connected to the lowest part of the surface of the air outlet cover (3), an overflow pipe (71) is connected to the collecting box (7), the overflow pipe (71) is obliquely arranged, gas and liquid blocking is arranged in the collecting box (7), the height of the water inlet end of the overflow pipe (71) is lower than the height of the water outlet end of the overflow pipe (71), and the water inlet end of the overflow pipe (71) is positioned in the gas and liquid blocking layer.

6. An EGR cooler according to claim 5, characterized in that: the surface of the air outlet cover (3) is connected with a plurality of heat dissipation annular plates (32).

7. An EGR cooler according to claim 6, characterized in that: an active carbon net (31) is arranged at the air outlet end of the air inlet cover (2).

8. An EGR cooler according to claim 7, characterized in that: the water outlet end of the water inlet pipe (11) is communicated with the lowest part of the inner wall of the shell (1), a plurality of spiral arc plates (13) are connected to the inner wall of the shell (1), mounting holes are formed in the spiral arc plates (13), and the cooling pipe (4) is arranged in the mounting holes in a penetrating mode.