Exhaust catalyst and vehicle

Abstract

The exhaust catalyst comprises a corrugated pipe, the corrugated pipe comprises a corrugated inner pipe body and a corrugated outer pipe body, the corrugated inner pipe body is arranged in the corrugated outer pipe body in a matched mode, the first end of the corrugated inner pipe body is connected with the first end of the corrugated outer pipe body, and the second end of the corrugated inner pipe body is connected with the second end of the corrugated outer pipe body; and a waste gas flow channel is formed in the corrugated inner pipe. The exhaust catalytic converter has the advantages that the bending deformation difficulty of the corrugated pipe is low, and the initial displacement compensation effect on staggered holes is good when a whole vehicle is assembled.

Description

Technical Field

[0001] The present application relates to the field of vehicle technology, and in particular to an exhaust catalyst and a vehicle. Background Art

[0002] With the advancement of the national energy conservation and emission reduction strategy, the number of mass-produced cases of extended-range vehicles and plug-in hybrid vehicles equipped with EGR (Exhaust Gas Return) systems has continued to increase, and sales have also increased significantly. However, the EGR system not only increases the complexity of the cabin layout, but also brings great challenges to the engine and vehicle calibration.

[0003] However, in the related art, the wall thickness of the bellows of the exhaust catalyst in the EGR system is relatively large, and it is difficult to bend and deform. When the flange on the bellows is assembled with the flange on the cooler, the cumulative deviations in assembly and production can easily lead to misalignment of the mounting holes and threaded holes, affecting the assembly convenience and assembly time. Utility Model Content

[0004] The present application aims to solve one of the technical problems in the related art at least to some extent.

[0005] To this end, an embodiment of the present application proposes an exhaust catalyst, which has the advantages of low difficulty in bending and deforming the bellows and good initial displacement compensation effect of the misaligned holes during vehicle assembly.

[0006] An embodiment of the present application also provides a vehicle.

[0007] The exhaust catalyst of the embodiment of the present application includes a bellows, which includes a bellows inner tube and a bellows outer tube. The bellows inner tube is fitted inside the bellows outer tube, the first end of the bellows inner tube is connected to the first end of the bellows outer tube, the second end of the bellows inner tube is connected to the second end of the bellows outer tube, and an exhaust gas flow channel is formed inside the bellows inner tube.

[0008] According to the exhaust catalyst of the embodiment of the present application, the bellows includes a bellows inner tube and a bellows outer tube sleeved on the bellows inner tube, and an exhaust gas flow channel is formed in the bellows inner tube. Among them, the sum of the thickness of the bellows inner tube and the bellows outer tube can be consistent or substantially consistent with the wall thickness of the single-layer bellows in the related art to ensure the durability and reliability of the bellows. At this time, the wall thickness of each of the bellows inner tube and the bellows outer tube is smaller than the wall thickness of the single-layer bellows in the related art, thereby making the rigidity of the bellows inner tube and the bellows outer tube relatively lower. When the whole vehicle is assembled, each of the bellows inner tube and the bellows outer tube 11 is easier to bend and deform than the other, so as to facilitate the initial displacement compensation of the staggered holes at the joint of the exhaust catalyst and the cooler 4, and the exhaust catalyst is more convenient to assemble and the assembly time is reduced.

[0009] In some embodiments, the wall thickness of the corrugated inner tube is d1, and the wall thickness of the corrugated outer tube is d2, wherein 0.25 mm ≤ d1 ≤ 0.35 mm, and 0.25 mm ≤ d2 ≤ 0.35 mm.

[0010] In some embodiments, the exhaust catalyst further includes a heat insulation layer, and the heat insulation layer is coated on the outer peripheral surface of the corrugated outer tube.

[0011] In some embodiments, the exhaust catalyst further includes a shell, which is sleeved on the corrugated tube, and an installation cavity is defined between the inner wall surface of the shell and the outer peripheral surface of the corrugated outer tube, and the thermal insulation layer is arranged in the installation cavity.

[0012] In some embodiments, the housing comprises a metal piece made of a metal material.

[0013] In some embodiments, the insulation layer includes insulation wool fitted into the mounting cavity.

[0014] In some embodiments, the thickness of the thermal insulation layer is D1, and the thickness of the outer shell is D2, wherein 7 mm ≤ D1 ≤ 9 mm, and 0.1 mm ≤ D2 ≤ 0.2 mm.

[0015] In some embodiments, the outer shell also includes a first half shell and a second half shell, the first half shell and the second half shell are respectively arranged on both sides of the corrugated outer tube along the radial direction of the corrugated outer tube, the outer edge of the first half shell is provided with a first flange, the outer edge of the second half shell is provided with a second flange, and the first flange and the second flange are connected.

[0016] The vehicle according to the embodiment of the present application includes a cooler and an exhaust catalyst as described in any of the above embodiments, and the cooler is connected to the first end of the corrugated outer tube through a fastener.

[0017] The technical advantages of the vehicle according to the embodiment of the present application are the same as the technical advantages of the exhaust catalyst of the above-mentioned embodiment, which will not be repeated here.

[0018] In some embodiments, the cooler includes a first flange, the first flange is provided with at least two threaded holes, the bellows further includes a second flange connected to the first end of the bellows outer tube, the second flange is provided with mounting holes corresponding to the threaded holes one by one;

[0019] The fastener includes a bolt, which passes through the mounting hole and is threadedly matched with the corresponding threaded hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic diagram of an exhaust catalyst according to an embodiment of the present application.

[0021] Figure 2 is a schematic diagram of an exhaust catalyst and a cooler according to an embodiment of the present application, wherein the second half shell and the heat insulation layer are hidden.

[0022] Figure 3 Schematic diagram of a cooler and a stud according to an embodiment of the present application.

[0023] Figure 4 is another schematic diagram of an exhaust catalyst and a cooler according to an embodiment of the present application.

[0024] Figure 5 is another schematic diagram of an exhaust catalyst and a cooler according to an embodiment of the present application.

[0025] Reference numerals:

[0026] 1. Bellows; 11. Bellows outer tube; 12. Second flange; 121. Mounting hole; 2. Outer shell; 21. First half shell; 22. Second half shell; 23. First flange; 24. Second flange; 3. Catalyst; 4. Cooler; 41. First flange; 42. Threaded hole; 5. Hexagon socket bolt; 6. Stud. DETAILED DESCRIPTION

[0027] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, but cannot be understood as limiting the present application.

[0028] Combine the following Figure 1-Figure 5 An exhaust catalyst according to an embodiment of the present application is described.

[0029] The exhaust catalyst of the embodiment of the present application includes a bellows 1, which includes a bellows inner tube and a bellows outer tube 11. The bellows inner tube is fitted in the bellows outer tube 11, a first end of the bellows inner tube is connected to a first end of the bellows outer tube 11, a second end of the bellows inner tube is connected to a second end of the bellows outer tube 11, and an exhaust flow channel is formed in the bellows inner tube.

[0030] According to the exhaust catalyst of the embodiment of the present application, the bellows 1 includes a bellows inner tube and a bellows outer tube 11 sleeved on the bellows inner tube, and an exhaust gas flow channel is formed in the bellows inner tube. Among them, the sum of the thickness of the bellows inner tube and the bellows outer tube 11 can be consistent or substantially consistent with the wall thickness of the single-layer bellows in the related art to ensure the durability and reliability of the bellows 1. At this time, the wall thickness of each of the bellows inner tube and the bellows outer tube 11 is smaller than the wall thickness of the single-layer bellows in the related art, thereby making the rigidity of each of the bellows inner tube and the bellows outer tube 11 relatively lower than the other. When the whole vehicle is assembled, the bellows inner tube and the bellows outer tube 11 are easier to bend and deform, so as to facilitate the initial displacement compensation of the staggered holes at the joint of the exhaust catalyst and the cooler 4, and the exhaust catalyst is more convenient to assemble and the assembly time is less.

[0031] In some embodiments, the wall thickness of the corrugated inner tube is d1, and the wall thickness of the corrugated outer tube 11 is d2, wherein 0.25 mm≤d1≤0.35 mm, and 0.25 mm≤d2≤0.35 mm.

[0032] At this time, the thickness of the corrugated inner tube and the corrugated outer tube 11 is not too small to shorten their fatigue life under high temperature and exhaust gas environment, nor is it too large to cause excessive rigidity and inconvenience in bending and deformation.

[0033] Specifically, the inner bellows tube and the outer bellows tube 11 are both made of 304 stainless steel, and the thickness of the inner bellows tube and the outer bellows tube 11 can be 0.25mm, 0.3mm and 0.35mm. The bellows 1 thus formed has high durability and reliability, and can meet the low-cycle fatigue life of 2000 cycles and the high-cycle fatigue life of 10 million cycles.

[0034] In some embodiments, the exhaust catalyst further includes a heat insulation layer, which is coated on the outer peripheral surface of the corrugated outer tube 11 .

[0035] The design of the heat insulation layer effectively avoids the heat damage caused by the temperature of the corrugated outer tube 11 radiating to nearby components such as the wiring harness. In addition, under the condition of ensuring heat insulation, the exhaust catalyst can be installed in the area on the upper side of the cabin near the wiring harness and other components, without considering the airflow inside the cabin. The layout design of the exhaust catalyst is more flexible, the assembly is more convenient, and the assembly cost is lower.

[0036] In some embodiments, Figure 1 , Figure 2 , Figure 4 and Figure 5 As shown, the exhaust catalyst also includes a shell 2, which is sleeved on the corrugated tube 1, and an installation cavity is defined between the inner wall surface of the shell 2 and the outer peripheral surface of the corrugated outer tube 11, and the heat insulation layer is arranged in the installation cavity.

[0037] The outer shell 2 is used to gather and limit the heat insulation layer, effectively preventing the heat insulation layer from separating from the corrugated outer tube 11 and causing heat insulation failure, thereby further reducing the risk of heat damage caused by the exhaust catalyst to surrounding components such as wiring harnesses.

[0038] Specifically, the outer shell 2 has a first end and a second end opposite to each other along the extension direction of the corrugated outer tube 11, the first end of the outer shell 2 is brazed and connected to the first end of the corrugated outer tube 11, and the second end of the outer shell 2 is brazed and connected to the second end of the corrugated outer tube 11. Thus, when the outer shell 2 is connected to the corrugated outer tube 11, an excessively high temperature will not be generated to affect the heat insulation performance of the heat insulation layer.

[0039] In some embodiments, the housing 2 includes a metal piece made of a metal material.

[0040] The housing 2 made of metal material can ensure the position of the heat insulation layer while having lower manufacturing cost and longer service life.

[0041] And / or, the heat insulation layer includes heat insulation cotton fitted in the installation cavity. The heat insulation layer made of heat insulation cotton is not easy to burn and has a low thermal conductivity, and can meet the required heat insulation requirements with a smaller volume, thereby making the exhaust catalyst smaller and occupying less space.

[0042] Specifically, the heat insulation layer is made of high-silicon oxide material. The outer shell 2 is made of 304 stainless steel material, thereby improving the aesthetics of the cabin while also having good formability and strength.

[0043] In some embodiments, the thickness of the heat insulation layer is D1, and the thickness of the outer shell 2 is D2, wherein 7 mm ≤ D1 ≤ 9 mm, and 0.1 mm ≤ D2 ≤ 0.2 mm.

[0044] The heat insulation layer at this thickness can reduce the temperature by at least 200°C, which can better reduce the heat damage of the bellows 1 to the surrounding components. The shell 2 at this thickness has higher strength, longer service life, and better protection and limiting effect on the heat insulation layer.

[0045] Specifically, the thickness of the heat insulation layer can be 7 mm, 8 mm and 9 mm, and the thickness of the outer shell 2 can be 0.1 mm, 0.15 mm and 0.2 mm.

[0046] In some embodiments, Figure 1 and Figure 2 As shown, the outer shell 2 also includes a first half shell 21 and a second half shell 22. The first half shell 21 and the second half shell 22 are respectively arranged on both sides of the radial direction of the corrugated outer tube 11. The outer edge of the first half shell 21 is provided with a first flange 23, and the outer edge of the second half shell 22 is provided with a second flange 24. The first flange 23 and the second flange 24 are connected.

[0047] The outer shell 2 is split into a first half shell 21 and a second half shell 22, and the first half shell 21 and the second half shell 22 are connected to form an outer shell 2 wrapped with an irregular heat insulation layer, and the outer shell 2 is conveniently and reliably connected to the corrugated tube 1. The design of the first flange 23 and the second flange 24 also makes the connection between the first half shell 21 and the second half shell 22 convenient and reliable.

[0048] Specifically, the first flange 23 and the second flange 24 are connected by spot welding to ensure the connection strength therebetween.

[0049] The vehicle according to the embodiment of the present application includes a cooler 4 and an exhaust catalyst as in any of the above embodiments, and the cooler 4 is connected to the first end of the corrugated outer tube 11 through a fastener.

[0050] The technical advantages of the vehicle according to the embodiment of the present application are the same as the technical advantages of the exhaust catalyst of the above-mentioned embodiment, which will not be repeated here.

[0051] In some embodiments, Figure 1-Figure 5 As shown, the cooler 4 includes a first flange 41, and the first flange 41 is provided with at least two threaded holes 42. The bellows 1 also includes a second flange 12 connected to the first end of the bellows outer tube 11, and the second flange 12 is provided with mounting holes 121 corresponding to the threaded holes 42. The fastener includes a bolt, which passes through the mounting hole 121 and is threadedly matched with the corresponding threaded hole 42.

[0052] Compared with the use of studs 6 to connect the first flange 41 and the second flange 12 in the related art, the use of lower-cost bolts to connect the first flange 41 and the second flange 12 further reduces the manufacturing cost of the vehicle.

[0053] Specifically, the number of threaded holes 42 and mounting holes 121 are both two. Figure 3-Figure 5 As shown, during assembly, a stud 6 can be pre-installed at a threaded hole 42 on the first flange 41. During the docking process of the second flange 12 and the first flange 41, the stud 6 can be fitted into one of the mounting holes 121 of the first flange 41 to correct the misaligned hole problem. On this basis, a bolt is pre-tightened at the other mounting hole 121 and the threaded hole 42; then the stud 6 is removed and tightened with another bolt to achieve assembly of the exhaust catalyst and the cooler 4.

[0054] In some embodiments, Figure 5 As shown, the bolts include hexagon socket head bolts 5 .

[0055] Compared with nuts and external hexagonal bolts, the tool for assembling the internal hexagonal bolt 5 is smaller in size, requires less assembly space, and better reduces the impact on surrounding parts.

[0056] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0057] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0058] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0059] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0060] In the present application, the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0061] Although the above embodiments have been shown and described, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations on the present application. Changes, modifications, substitutions and variations of the above embodiments by those of ordinary skill in the art are all within the scope of protection of the present application.

Claims

1. An exhaust catalyst, characterized in that: include: A bellows, the bellows comprising a bellows inner tube and a bellows outer tube, the bellows inner tube is fitted inside the bellows outer tube, a first end of the bellows inner tube is connected to a first end of the bellows outer tube, a second end of the bellows inner tube is connected to a second end of the bellows outer tube, and an exhaust gas flow passage is formed inside the bellows inner tube; The exhaust catalyst further includes a heat insulation layer, and the heat insulation layer is coated on the outer peripheral surface of the corrugated outer tube.

2. The exhaust catalyst according to claim 1, characterized in that: The wall thickness of the corrugated inner tube is d1, and the wall thickness of the corrugated outer tube is d2, wherein 0.25 mm ≤ d1 ≤ 0.35 mm, and 0.25 mm ≤ d2 ≤ 0.35 mm.

3. The exhaust catalyst according to claim 1, characterized in that: The exhaust catalyst also includes a shell, which is sleeved on the corrugated tube. An installation cavity is defined between the inner wall surface of the shell and the outer peripheral surface of the corrugated outer tube, and the heat insulation layer is arranged in the installation cavity.

4. The exhaust catalyst according to claim 3, characterized in that: The housing includes a metal member made of a metal material.

5. The exhaust gas catalytic converter according to claim 3 or 4, characterized in that: The heat insulation layer includes heat insulation cotton fitted in the installation cavity.

6. The exhaust catalyst according to claim 3, characterized in that: The thickness of the heat insulation layer is D1, and the thickness of the outer shell is D2, wherein 7mm≤D1≤9mm, 0.1mm≤D2≤0.2mm.

7. The exhaust catalyst according to claim 3, characterized in that: The outer shell also includes a first half shell and a second half shell, the first half shell and the second half shell are respectively arranged on both sides of the corrugated outer tube along the radial direction of the corrugated outer tube, the outer edge of the first half shell is provided with a first flange, the outer edge of the second half shell is provided with a second flange, and the first flange and the second flange are connected.

8. A vehicle, characterized in that: It comprises a cooler and the exhaust catalyst as claimed in any one of claims 1 to 7, wherein the cooler is connected to the first end of the corrugated outer tube via a fastener.

9. The vehicle according to claim 8, characterized in that The cooler comprises a first flange, the first flange is provided with at least two threaded holes, the bellows further comprises a second flange connected to the first end of the bellows outer tube, the second flange is provided with mounting holes corresponding to the threaded holes one by one; The fastener includes a bolt, which passes through the mounting hole and is threadedly matched with the corresponding threaded hole.

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