EGR corrugated pipe

Abstract

The utility model discloses an EGR (Exhaust Gas Recirculation) corrugated pipe in the technical field of corrugated pipes. The corrugated pipe body comprises a main pipe body, heat dissipation areas used for protecting the first sealing ring and the second sealing ring are installed at the two ends of the main pipe body, heat conduction rings used for being matched with the heat dissipation areas for heat dissipation are installed at the two ends of the main pipe body, and a plurality of heat conduction rods are installed on the outer walls of the heat conduction rings. When the inner cavity of the main pipe body is heated, the heat conduction rings are heated, heat is conducted to the interiors of the first protection ring, the second protection ring, the third protection ring and the fourth protection ring through the heat conduction rods, and heat is dissipated through a first heat dissipation groove, a second heat dissipation groove, a third heat dissipation groove and a fourth heat dissipation groove. The temperature of one end close to the first sealing ring and the second sealing ring is reduced, so that the first sealing ring and the second sealing ring are prevented from being aged and damaged due to high temperature, heat is conducted to the outside of the main pipe body through a heat conduction ring and a heat conduction rod, and cracking caused by excessive thermal deformation is avoided.

Description

Technical Field

[0001] This utility model relates to the field of corrugated pipe technology, specifically to an EGR corrugated pipe. Background Technology

[0002] Exhaust gas recirculation (EGR) systems return a portion of the exhaust gas from the engine to the intake manifold, increasing the carbon dioxide concentration in the intake air and reducing the combustion chamber temperature. EGR systems reduce nitrogen oxide (NOx) emissions from the exhaust. With the improved performance of China VI emission standard engines, the exhaust temperature continues to rise. Some of the high-temperature exhaust gas from engine combustion flows into the EGR cooler from the exhaust pipe through the EGR intake manifold. The original stainless steel brazed pipe body is prone to exhaust gas leakage in the high-temperature exhaust environment.

[0003] For example, Chinese Patent Application No. CN201620947366.4 discloses a corrugated double-layer EGR intake pipe for a turbocharged diesel engine. Its specific contents include: an intake bend and an exhaust bend, the intake bend being connected to the exhaust bend via a corrugated pipe; an inner intake bend is provided inside the intake bend, one end of which is welded to the intake bend via an intake end connecting flange, and the other end of which is located inside the corrugated pipe; an inner exhaust bend is provided inside the exhaust bend, one end of which is welded to the exhaust bend via an exhaust end connecting flange, and the other end of which is sleeved between the corrugated pipe and the inner intake bend. This design has the following technical problems:

[0004] The brazing method is used, but the brazing strength is greatly reduced when exposed to high-temperature exhaust gas and exhaust pulse. Under conditions of high exhaust gas temperature, high exhaust pulse pressure, and vibration caused by engine operation, the stainless steel corrugated pipe is prone to excessive thermal deformation, which can lead to cracking and affect the normal use of the intake pipe and EGR system. Utility Model Content

[0005] Therefore, this utility model provides an EGR corrugated pipe to solve the problem of excessive thermal deformation and cracking in the prior art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] An EGR bellows includes a bellows body;

[0008] A second connecting pipe is installed at one end of the corrugated pipe body, and a first sealing ring and a second sealing ring are installed on the outer wall of the second connecting pipe.

[0009] The bellows body includes a main body, and heat dissipation areas for protecting the first and second sealing rings are installed at both ends of the main body.

[0010] Both ends of the main body are equipped with heat-conducting rings for heat dissipation in conjunction with the heat dissipation zone, and multiple heat-conducting rods are installed on the outer wall of the heat-conducting rings.

[0011] Furthermore, an installation head is installed at one end of the main body, and a second connecting pipe is installed at the other end of the main body. A first connecting pipe is installed in the middle of the installation head, and installation holes are machined at both ends of the installation head.

[0012] Furthermore, the outer wall of the second connecting pipe is provided with a first mounting groove and a second mounting groove for limiting the first sealing ring and the second sealing ring, and a ventilation hole is provided in the middle of the second connecting pipe.

[0013] Furthermore, a corrugated end is installed in the middle of the main body, and a heat insulation layer is installed on the protruding end of the corrugated end.

[0014] Furthermore, the heat dissipation area includes a first protective ring, a second protective ring, a third protective ring, and a fourth protective ring, and the cross-sections of the first protective ring, the second protective ring, the third protective ring, and the fourth protective ring are all U-shaped, and the heat-conducting rod is located inside the first protective ring, the second protective ring, the third protective ring, and the fourth protective ring.

[0015] Furthermore, the first protective ring has a plurality of first heat dissipation grooves machined in the middle, the second protective ring has a plurality of second heat dissipation grooves machined in the middle, the third protective ring has a plurality of third heat dissipation grooves machined in the middle, and the fourth protective ring has a plurality of fourth heat dissipation grooves machined in the middle.

[0016] This utility model has the following advantages:

[0017] When the inner cavity of the main body is heated, the heat-conducting ring is heated, and the heat is conducted to the interior of the first protective ring, the second protective ring, the third protective ring and the fourth protective ring respectively through the heat-conducting rod, and dissipated through the first heat dissipation groove, the second heat dissipation groove, the third heat dissipation groove and the fourth heat dissipation groove, so that the temperature near the first sealing ring and the second sealing ring is reduced, thereby preventing the first sealing ring and the second sealing ring from aging and being damaged due to high temperature. Furthermore, the heat is conducted to the outside of the main body through the heat-conducting ring and the heat-conducting rod, avoiding cracking caused by excessive thermal deformation. Attached Figure Description

[0018] To more clearly illustrate the embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0019] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the implementation conditions of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportional relationships, or adjustments to the size, without affecting the effects and purposes that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model.

[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0021] Figure 2 This is a schematic diagram of the structure of the second connecting pipe of this utility model;

[0022] Figure 3 This is a schematic diagram of the structure of the corrugated pipe body of this utility model;

[0023] Figure 4 For this utility model Figure 3 Enlarged view of point A;

[0024] Figure 5 This is a schematic diagram showing the connection between the second connecting pipe, the heat-conducting ring, and the main body of this utility model.

[0025] In the diagram: 01 - Corrugated pipe body;

[0026] 100 - Main body, 110 - Corrugated end, 111 - Heat insulation layer, 200 - Heat dissipation area, 210 - First protective ring, 211 - First heat dissipation groove, 220 - Second protective ring, 221 - Second heat dissipation groove, 230 - Third protective ring, 231 - Third heat dissipation groove, 240 - Fourth protective ring, 241 - Fourth heat dissipation groove, 400 - Thermally conductive ring, 410 - Thermally conductive rod.

[0027] 10-Mounting head, 11-Mounting hole, 12-First connecting pipe, 20-Second connecting pipe, 21-Ventilation hole, 22-First sealing ring, 23-Second sealing ring, 24-First mounting groove, 25-Second mounting groove. Detailed Implementation

[0028] The following describes the implementation of the present invention through specific embodiments. Those skilled in the art can readily understand the other advantages and benefits of the present invention from the contents disclosed in this specification. Obviously, the embodiments described are only a portion of the embodiments of the present invention, not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are also within the scope of protection of the present invention.

[0029] The terms such as "upper," "lower," "left," "right," and "middle" used in this specification are merely for clarity of description and are not intended to limit the scope of implementation of this utility model. Any changes or adjustments to their relative relationships, without substantially altering the technical content, shall also be considered within the scope of implementation of this utility model.

[0030] Please see Figure 1-Figure 5 This utility model provides an EGR bellows, including a bellows body 01.

[0031] A second connecting pipe 20 is installed at the right end of the bellows body 01. One end of the second connecting pipe 20 is inserted inside the bellows body 01 to prevent the bellows body 01 from deforming under conditions of high exhaust temperature and high exhaust pressure. A first sealing ring 22 and a second sealing ring 23 are sleeved on the outer wall of the second connecting pipe 20, and the first sealing ring 22 and the second sealing ring 23 are located inside the bellows body 01 to prevent gas leakage.

[0032] The outer wall of the second connecting pipe 20 is provided with a first mounting groove 24 and a second mounting groove 25 for limiting the first sealing ring 22 and the second sealing ring 23. The first sealing ring 22 is fitted in the cavity of the first mounting groove 24, and the second sealing ring 23 is fitted in the cavity of the second mounting groove 25. This makes it difficult for the first sealing ring 22 and the second sealing ring 23 to shift when the second connecting pipe 20 is installed inside the bellows body 01. The first sealing ring 22 and the cavity of the first mounting groove 24 are tightly fitted, and the outer wall of the first sealing ring 22 is fitted with the inner wall of the bellows body 01. The second sealing ring 23 and the cavity of the second mounting groove 25 are tightly fitted, and the outer wall of the second sealing ring 23 is fitted with the inner wall of the bellows body 01, so as to avoid gas leakage.

[0033] The second connecting pipe 20 has a ventilation hole 21 in the middle for gas circulation.

[0034] The corrugated pipe body 01 includes a main pipe body 100, and a corrugated end 110 is fixedly installed in the middle of the main pipe body 100. A heat insulation layer 111 is installed on the protruding end of the corrugated end 110 to prevent the operator from accidentally touching the corrugated end 110 and causing burns when disassembling the corrugated pipe body 01. The heat insulation layer 111 provides protection for the operator.

[0035] The left end of the main body 100 is equipped with an installation head 10, and the second connecting pipe 20 is installed at the right end of the main body 100. The middle part of the installation head 10 is fixedly installed with a first connecting pipe 12. The two ends of the installation head 10 are machined with installation holes 11. Bolts can be inserted into the cavity of the installation holes 11 to fix the installation head 10 with the parts on the automobile, thereby limiting the position of the main body 100.

[0036] Both ends of the main body 100 are equipped with heat-conducting rings 400 for heat dissipation in conjunction with the heat dissipation area 200, and a plurality of heat-conducting rods 410 are installed on the outer wall of the heat-conducting rings 400.

[0037] The left and right ends of the main body 100 are equipped with heat dissipation areas 200 for protecting the first sealing ring 22 and the second sealing ring 23. The heat dissipation area 200 includes a first protective ring 210, a second protective ring 220, a third protective ring 230 and a fourth protective ring 240. The cross-sections of the first protective ring 210, the second protective ring 220, the third protective ring 230 and the fourth protective ring 240 are all U-shaped. The size and structure of the first protective ring 210, the second protective ring 220, the third protective ring 230 and the fourth protective ring 240 are all the same. The heat conducting rods 410 are provided inside the first protective ring 210, the second protective ring 220, the third protective ring 230 and the fourth protective ring 240. The heat conducting rods 410 inside the first protective ring 210, the second protective ring 220, the third protective ring 230 and the fourth protective ring 240 can prevent burns to the operator when disassembling the bellows body 01.

[0038] The first protective ring 210 has a plurality of first heat dissipation grooves 211 machined in the middle, the second protective ring 220 has a plurality of second heat dissipation grooves 221 machined in the middle, the third protective ring 230 has a plurality of third heat dissipation grooves 231 machined in the middle, and the fourth protective ring 240 has a plurality of fourth heat dissipation grooves 241 machined in the middle.

[0039] The first heat dissipation groove 211, the second heat dissipation groove 221, the third heat dissipation groove 231 and the fourth heat dissipation groove 241 are used to dissipate the heat generated by the heat-conducting rod 410, and the second connecting pipe 20 is located on the right side of the heat-conducting ring 400.

[0040] The heat-conducting ring 400 prevents gas leakage. When the inner cavity of the main body 100 is heated, the heat-conducting ring 400 is heated. The heat is conducted through the heat-conducting rod 410 to the interior of the first protective ring 210, the second protective ring 220, the third protective ring 230, and the fourth protective ring 240, respectively. Heat is also dissipated through the first heat dissipation groove 211, the second heat dissipation groove 221, the third heat dissipation groove 231, and the fourth heat dissipation groove 241, so that the temperature near the first sealing ring 22 and the second sealing ring 23 is reduced. This prevents the first sealing ring 22 and the second sealing ring 23 from aging and being damaged due to high temperature. The heat is also conducted to the outside of the main body 100 through the heat-conducting ring 400 and the heat-conducting rod 410, preventing cracking caused by excessive thermal deformation.

[0041] Although the present invention has been described in detail above with general descriptions and specific embodiments, some modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. An EGR bellows, comprising a bellows body (01), characterized in that: A second connecting pipe (20) is installed at one end of the corrugated pipe body (01), and a first sealing ring (22) and a second sealing ring (23) are installed on the outer wall of the second connecting pipe (20); The bellows body (01) includes a main body (100), and heat dissipation areas (200) for protecting the first sealing ring (22) and the second sealing ring (23) are installed at both ends of the main body (100). The main body (100) is equipped with heat-conducting rings (400) at both ends for heat dissipation in conjunction with the heat dissipation area (200), and a plurality of heat-conducting rods (410) are installed on the outer wall of the heat-conducting rings (400).

2. The EGR bellows according to claim 1, characterized in that: One end of the main body (100) is equipped with an installation head (10), and the second connecting pipe (20) is installed at the other end of the main body (100). The middle part of the installation head (10) is equipped with a first connecting pipe (12), and the two ends of the installation head (10) are machined with installation holes (11).

3. An EGR bellows according to claim 1, characterized in that: The outer wall of the second connecting pipe (20) is provided with a first mounting groove (24) and a second mounting groove (25) for limiting the first sealing ring (22) and the second sealing ring (23), and a ventilation hole (21) is provided in the middle of the second connecting pipe (20).

4. An EGR bellows according to claim 1, characterized in that: A corrugated end (110) is installed in the middle of the main body (100), and a heat insulation layer (111) is installed on the protruding end of the corrugated end (110).

5. An EGR bellows according to claim 1, characterized in that: The heat dissipation area (200) includes a first protective ring (210), a second protective ring (220), a third protective ring (230), and a fourth protective ring (240), and the cross-sections of the first protective ring (210), the second protective ring (220), the third protective ring (230), and the fourth protective ring (240) are all U-shaped, and the heat-conducting rod (410) is located inside the first protective ring (210), the second protective ring (220), the third protective ring (230), and the fourth protective ring (240).

6. An EGR bellows according to claim 5, characterized in that: The first protective ring (210) has a plurality of first heat dissipation grooves (211) machined in the middle, the second protective ring (220) has a plurality of second heat dissipation grooves (221) machined in the middle, the third protective ring (230) has a plurality of third heat dissipation grooves (231) machined in the middle, and the fourth protective ring (240) has a plurality of fourth heat dissipation grooves (241) machined in the middle.

Images