EGR (Exhaust Gas Recirculation) cooler with auxiliary heat exchange of heat pipe

Abstract

The utility model discloses a heat pipe auxiliary heat exchange EGR cooler which comprises a shell, flanges are fixedly connected to the two ends of the shell respectively, placing grooves are formed in the opposite faces of the two flanges respectively, screw holes are formed in the inner surfaces of the placing grooves respectively, pipe plates are placed on the inner walls of the placing grooves in an attached mode respectively, and the pipe plates are arranged in the screw holes respectively. A fixing screw corresponding to the position of the screw hole is connected to the pipe plate in a penetrating and threaded mode, a plurality of connecting pipes are connected to the surface of the pipe plate in a penetrating mode, second connecting threads are arranged on the outer walls of the connecting pipes, a plurality of cooling pipes are arranged in the shell, and the two ends of each cooling pipe penetrate through the two corresponding connecting pipes on the two sides respectively. And the connecting pipe is in threaded connection with the cooling pipe through a locking cap. Through the arrangement of the pipe plate, the cooling pipe, the connecting pipe, the locking cap and the second connecting thread, the sealing performance is improved, and leakage of cooling liquid is avoided; and through the arrangement of the placing groove, the fixing screw and the screw hole, disassembly and assembly are convenient, and the maintenance efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of exhaust gas recirculation, and particularly relates to an EGR cooler assisted by heat pipes for heat exchange. Background Art

[0002] The exhaust gas recirculation system, abbreviated as EGR, is to send a small part of the exhaust gas generated by a diesel engine or a gasoline engine back to the cylinder. Since the recirculated exhaust gas has inertia, the combustion process will be delayed, that is to say, the combustion speed will slow down, resulting in a slowdown in the pressure formation process in the combustion chamber. This is the main reason for the reduction of nitrogen oxides. In addition, increasing the exhaust gas recirculation rate will reduce the total exhaust gas flow, so the total pollutant output in the exhaust gas emissions will be relatively reduced. The cooler is an important component in the EGR system. The function of the cooler is to cool the recirculated exhaust gas to reduce the temperature of the recirculated exhaust gas.

[0003] In related technologies, such as the Chinese patent with the application number: "201820868600.3" and the name: "An EGR cooler", which includes a housing. A plurality of cooling pipes are arranged inside the housing. The cooling pipe includes a housing, with outer fins arranged on the outer wall of the housing and inner fins arranged on the inner wall of the housing. The inner fins are arranged along the axial direction of the housing. In the utility model, fins for heat dissipation are arranged on both the outer wall and the inner wall of the cooling pipe, enabling efficient heat exchange between the inside of the cooling pipe and the coolant, and improving the cooling effect of the gas.

[0004] Although the above patent can improve the gas cooling effect, there is no sealing mechanism at the through connection between the tube sheet and the cooling pipe, resulting in a risk of coolant leakage. Moreover, it is difficult to replace and repair the cooling pipe after it is damaged, and the repair efficiency is low. Content of the Utility Model

[0005] In order to overcome the deficiencies of the prior art, one of the purposes of the utility model is to provide an EGR cooler assisted by heat pipes for heat exchange. When installing the cooling pipe inside the housing, by setting the tube sheet, cooling pipe, connecting pipe, locking cap, and connecting thread two, the two ends of the cooling pipe are respectively passed through the connecting pipes corresponding to the two ends. Next, rotate the locking cap to thread the first thread groove thereof with the connecting thread two of the connecting pipe, and at the same time, thread the second thread groove with the connecting thread one of the cooling pipe, completing the sealing connection while fixedly installing the cooling pipe inside the housing to avoid coolant leakage; by setting the placement groove, fixing screw, and screw hole, when replacing the damaged cooling pipe, rotate the locking cap in the reverse direction to release the limit lock on the cooling pipe. Next, rotate the fixing screw to take it out from the screw hole, and then the tube sheet can be removed, so that the cooling pipe can be taken out from the housing for replacement and repair, improving the repair efficiency.

[0006] One of the purposes of the present utility model is achieved by the following technical solutions: An EGR cooler with heat pipe assisted heat exchange, comprising: a housing, both ends of the housing are fixedly connected with flanges, placing grooves are opened on the opposite surfaces of the two flanges, screw holes are opened on the inner surfaces of the placing grooves, tube sheets are placed in a fitting manner on the inner walls of the placing grooves, fixing screws corresponding to the positions of the screw holes are threadedly connected through the tube sheets, a plurality of connecting pipes are connected through the surfaces of the tube sheets, connecting threads II are arranged on the outer walls of the connecting pipes, a plurality of cooling pipes are arranged in the housing, and both ends of the cooling pipes respectively penetrate through two connecting pipes with corresponding positions on both sides, and the connecting pipes and the cooling pipes are threadedly connected through locking caps;

[0007] The cooling pipe comprises a pipe body, connecting threads II are arranged on the outer walls of both ends of the pipe body, fins are arranged on the inner and outer walls of the pipe body, and the fins are arranged along the axial direction of the pipe body. By providing the tube sheet, cooling pipe, connecting pipe, locking cap, and connecting thread II, the sealing performance is improved to avoid coolant leakage; by providing the placing groove, fixing screw, and screw hole, it is convenient for disassembly and assembly, and the maintenance efficiency is improved.

[0008] According to the described EGR cooler with heat pipe assisted heat exchange, a thread groove I and a thread groove II are opened on the inner wall of the locking cap, the thread groove I is matched with the connecting thread II, and the thread groove II is matched with the connecting thread I.

[0009] According to the described EGR cooler with heat pipe assisted heat exchange, the outer wall of the fixing screw is threadedly connected with the inner wall of the screw hole.

[0010] For the provided EGR cooler with heat pipe assisted heat exchange, anti-slip lines are arranged on the outer wall of the locking cap.

[0011] According to the described EGR cooler with heat pipe assisted heat exchange, a liquid inlet pipe for introducing coolant and a liquid outlet pipe for discharging coolant are arranged on the housing.

[0012] According to the described EGR cooler with heat pipe assisted heat exchange, the number of internal fins is the same as that of external fins and they correspond to each other one by one.

[0013] According to the described EGR cooler with heat pipe assisted heat exchange, a sealing film is arranged at the through connection part of the cooling pipe and the connecting pipe.

[0014] According to the described EGR cooler with heat pipe assisted heat exchange, the rear outer wall of the tube sheet is hermetically fitted with the inner wall of the housing.

[0015] Additional aspects and advantages of the present utility model will be given in part in the following description, become apparent in part from the following description, or be understood through the practice of the present utility model. Description of the Drawings

[0016] The present utility model will be further described below in conjunction with the accompanying drawings and embodiments;

[0017] Figure 1 It is a perspective view of an EGR cooler with heat pipe assisted heat exchange according to the present utility model;

[0018] Figure 2 It is a perspective view of the cooling pipe of an EGR cooler with heat pipe assisted heat exchange according to the present utility model;

[0019] Figure 3 It is a perspective view of the tube sheet of an EGR cooler with heat pipe assisted heat exchange according to the present utility model;

[0020] Figure 4 It is a perspective view of the housing of an EGR cooler with heat pipe assisted heat exchange according to the present utility model;

[0021] Figure 5 It is a sectional view of the locking cap of an EGR cooler with heat pipe assisted heat exchange according to the present utility model.

[0022] Legend:

[0023] 1. Outer shell; 2. Liquid inlet pipe; 3. Liquid outlet pipe; 4. Flange; 5. Tube sheet; 6. Cooling pipe; 7. Connecting pipe; 8. Locking cap; 9. Fixing screw; 401. Placing groove; 402. Screw hole; 601. Fins; 602. Connecting thread one; 701. Connecting thread two; 801. Thread groove one; 802. Thread groove two; 803. Anti-slip pattern. Specific embodiments

[0024] This part will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The function of the drawings is to supplement the description of the text part of the specification, enabling people to intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but it should not be construed as a limitation on the protection scope of the present utility model.

[0025] Refer to Figures 1-5, an EGR cooler with heat pipe assisted heat exchange according to an embodiment of the present utility model includes: a housing 1, on which an inlet pipe 2 for introducing coolant and an outlet pipe 3 for discharging coolant are provided. Flanges 4 are fixedly connected to both ends of the housing 1. Placing grooves 401 are formed on the opposite surfaces of the two flanges 4, and screw holes 402 are formed on the inner surfaces of the placing grooves 401. Tube plates 5 are placed in a fitting manner on the inner walls of the placing grooves 401. The outer wall of the rear side of the tube plate 5 is in sealed fit with the inner wall of the housing 1. Fixing screws 9 corresponding to the positions of the screw holes 402 are threadedly connected through the tube plate 5, and the outer wall of the fixing screw 9 is threadedly connected with the inner wall of the screw hole 402. A number of connecting pipes 7 are connected through the surface of the tube plate 5. Connecting threads two 701 are provided on the outer walls of the connecting pipes 7. A number of cooling pipes 6 are provided inside the housing 1. The two ends of the cooling pipe 6 respectively penetrate through two connecting pipes 7 at corresponding positions on both sides. The connecting pipe 7 and the cooling pipe 6 are threadedly connected through a locking cap 8. A sealing film is provided at the through connection of the cooling pipe 6 and the connecting pipe 7. Thread groove one 801 and thread groove two 802 are formed on the inner wall of the locking cap 8. Thread groove one 801 is matched with connecting thread two 701, and thread groove two 802 is matched with connecting thread one 602. Anti-slip lines 803 are provided on the outer wall of the locking cap 8;

[0026] The cooling pipe 6 includes a pipe body. Connecting threads two 701 are provided on the outer walls of both ends of the pipe body. Fins 601 are provided on both the inner and outer walls of the pipe body. The number of the inner fins 601 is the same as that of the outer fins 601 and they correspond to each other one by one. The fins 601 are arranged along the axial direction of the pipe body. Through the provided tube plate 5, cooling pipe 6, connecting pipe 7, locking cap 8, and connecting thread two 701, when installing the cooling pipe 6 inside the housing 1, the two ends of the cooling pipe 6 respectively penetrate through the connecting pipes 7 at corresponding positions at both ends. Next, rotate the locking cap 8 to threadedly connect its thread groove one 801 with the connecting thread two 701 of the connecting pipe 7, and at the same time, thread groove two 802 is threadedly connected with the connecting thread one 602 of the cooling pipe 6. While fixing and installing the cooling pipe 6 inside the housing 1, a sealed connection is completed to avoid coolant leakage; through the provided placing groove 401, fixing screw 9, and screw hole 402, when replacing the damaged cooling pipe 6, rotate the locking cap 8 in the reverse direction to release the limit locking of the cooling pipe 6. Next, rotate the fixing screw 9 to take it out of the screw hole 402, and then the tube plate 5 can be removed, so that the cooling pipe 6 can be taken out of the housing 1 for replacement and repair, improving the repair efficiency.

[0027] Working principle: When installing the cooling pipe 6 inside the housing 1, the two ends of the cooling pipe 6 respectively penetrate through the connecting pipes 7 corresponding to the two ends. Next, rotate the locking cap 8 to thread-connect its thread groove 801 with the connecting thread 701 of the connecting pipe 7, and at the same time, thread groove 802 is thread-connected with the connecting thread 602 of the cooling pipe 6. While fixing and installing the cooling pipe 6 inside the housing 1, a sealed connection is completed to avoid coolant leakage. When replacing the damaged cooling pipe 6, rotate the locking cap 8 in the reverse direction to release the limit lock on the cooling pipe 6. Next, rotate the fixing screw 9 and take it out from the screw hole 402, and then the tube sheet 5 can be removed, so that the cooling pipe 6 can be taken out from the housing 1 for replacement and repair, improving the repair efficiency;

[0028] During use, connect the flange 4 to the intake and gas pipelines, inject the coolant into the housing 1 through the liquid inlet pipe 2, and discharge it from the liquid outlet pipe 3. The gas passes through the cooling pipe 6, and the fins 601 provided on the cooling pipe 6 increase the contact area between the gas and the cooling pipe 6, improving the heat exchange efficiency and heat dissipation effect.

[0029] The embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the knowledge scope of those of ordinary skill in the art to which the present invention pertains, various changes can be made without departing from the gist of the present invention.

Claims

1. An EGR cooler with heat pipe assisted heat exchange, comprising: The shell (1) is characterized in that flanges (4) are fixedly connected at both ends of the shell (1), and placement grooves (401) are provided on the opposite surfaces of the two flanges (4), screw holes (402) are provided on the inner surfaces of the placement grooves (401), and tube sheets (5) are placed on the inner walls of the placement grooves (401), and fixing screws (9) corresponding to the positions of the screw holes (402) are threadedly connected on the tube sheets (5), and a plurality of connecting tubes (7) are threadedly connected on the surface of the tube sheets (5), and the outer walls of the connecting tubes (7) are provided with connecting threads (701), and a plurality of cooling tubes (6) are arranged in the shell (1), and the two ends of the cooling tubes (6) respectively pass through two connecting tubes (7) corresponding to the positions on both sides, and the connecting tubes (7) are threadedly connected to the cooling tubes (6) via locking caps (8); The cooling pipe (6) comprises a pipe body, the outer walls at both ends of the pipe body are provided with connecting threads (701), the outer and inner walls of the pipe body are provided with fins (601), and the fins (601) are arranged along the axial direction of the pipe body.

2. The EGR cooler with heat pipe assisted heat exchange according to claim 1, characterized in that: The inner wall of the locking cap (8) is provided with a thread groove 1 (801) and a thread groove 2 (802), wherein the thread groove 1 (801) matches the connecting thread 2 (701), and the thread groove 2 (802) matches the connecting thread 1 (602).

3. The EGR cooler with heat pipe assisted heat exchange according to claim 1, characterized in that: The outer wall of the fixing screw (9) is threadedly connected to the inner wall of the screw hole (402).

4. The EGR cooler with heat pipe assisted heat exchange according to claim 2, characterized in that: The outer wall of the locking cap (8) is provided with anti-slip grooves (803).

5. The EGR cooler with heat pipe assisted heat exchange according to claim 1, characterized in that: The housing (1) is provided with a liquid inlet pipe (2) for introducing cooling liquid and a liquid outlet pipe (3) for discharging cooling liquid.

6. The EGR cooler with heat pipe assisted heat exchange according to claim 1, characterized in that: The number of the internal fins (601) and the external fins (601) is the same and corresponds one to one.

7. The EGR cooler with heat pipe assisted heat exchange according to claim 1, characterized in that: A sealing rubber film is provided at the through connection between the cooling pipe (6) and the connecting pipe (7).

8. The EGR cooler with heat pipe assisted heat exchange according to claim 1, characterized in that: The rear outer wall of the tube sheet (5) is in sealing contact with the inner wall of the outer shell (1).

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