Exhaust catalytic device
By rectifying and uniformly guiding the exhaust gas through a conical component, the problem of uneven temperature distribution in the exhaust catalytic converter is solved, thereby improving purification performance and durability.
Patent Information
- Application Number
- CN202520137074.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-21
- Publication Date
- 2025-12-19
- Estimated Expiration
- 2035-01-21
AI Technical Summary
In existing exhaust catalytic converters, exhaust gas tends to flow towards the rear of the catalyst, resulting in uneven temperature distribution, which reduces exhaust purification performance and durability.
The exhaust gas is rectified by using a conical component. The exhaust gas is evenly guided to the catalyst box through the contraction and extension sections to ensure uniform catalyst temperature distribution and avoid localized deterioration and wind erosion of the retainer.
It achieves uniform purification of exhaust gas, improves exhaust gas purification performance and device durability, and suppresses localized deterioration caused by uneven temperature and wind erosion of the retaining pad.
Smart Images
Figure CN223689801U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a kind of exhaust catalytic devices, and a kind of exhaust catalytic device suitable for being installed in engine body. BACKGROUND
[0002] Since the past, efforts for the purpose of mitigating climate change or reducing the impact are continuing, and research and development related to emission improvement are being conducted in order to achieve the purpose. In the prior art, an exhaust catalytic device can be provided at an exhaust portion of an engine such as an internal combustion engine of a vehicle, which purifies pollutants in exhaust gas discharged from the engine through an exhaust manifold by connecting the exhaust manifold to a catalytic converter and discharges the purified gas through an external exhaust pipe. However, exhaust gas from the engine is easily directed to the rear of the catalytic converter, resulting in uneven temperature distribution of the catalyst, and thus the exhaust gas purification performance and durability of the exhaust catalytic device are reduced. Therefore, it is necessary to improve the exhaust catalytic device to overcome the above problems. SUMMARY
[0003] The utility model relates to a kind of exhaust catalytic devices, with good exhaust purification performance and durability.
[0004] According to the embodiment of the utility model, the exhaust catalytic device includes: a catalyst case containing a catalyst, the catalyst being held in the catalyst case by a holding pad; and a conical member having a flange at one end and being welded to an engine body by the flange, the other end of the conical member being welded to the catalyst case, the conical member including two parts combined with each other, the conical member guiding exhaust gas flow at a right angle, one of the two parts having a contraction portion and an extension portion extending toward the catalyst, the contraction portion being located on the upstream side of the exhaust gas flow and reducing the volume of the conical member, the extension portion being located on the downstream side of the exhaust gas flow and guiding the exhaust gas flow toward the catalyst.
[0005] In the embodiment according to the utility model, the extension portion has a flat surface in the flow direction of the exhaust gas flow, and the extension portion extends into the catalyst case.
[0006] In the embodiment according to the utility model, the edge of the extension portion is curved toward the center of the catalyst.
[0007] In the embodiment according to the utility model, the exhaust catalytic device further includes an exhaust sensor mounting boss provided on the conical member between the contraction portion and the expansion portion.
[0008] Based on the above, in the exhaust gas catalytic device of the utility model, the tapered member flows the exhaust gas from the engine body through the contraction part, and guides the exhaust gas to the catalyst box uniformly through the extension part. Accordingly, the exhaust gas can flow to the catalyst box uniformly to make the temperature distribution of the catalyst uniform, to purify the exhaust gas through the catalyst efficiently, and avoid the local deterioration caused by the uneven temperature, and inhibit the wind erosion of the exhaust gas flow to the local holding pad. Therefore, the exhaust gas catalytic device has good exhaust gas purification performance and durability. BRIEF DESCRIPTION OF DRAWINGS
[0009] Figure 1 is the perspective view of the exhaust gas catalytic device of an embodiment of the utility model;
[0010] Figure 2 is the partial sectional view of the exhaust gas catalytic device of Figure 1
[0011] Figure 3 is the schematic view of the tapered member of Figure 2 guiding the exhaust gas flow;
[0012] Figure 4 is the partial sectional view of the exhaust gas catalytic device of another embodiment of the utility model.
[0013] BRIEF DESCRIPTION OF DRAWINGS
[0014] 50: engine body;
[0015] 50A: cylinder head;
[0016] 50B: cylinder block;
[0017] 100: exhaust gas catalytic device;
[0018] 110: catalytic converter;
[0019] 110a: inlet end face;
[0020] 110b: outlet end face;
[0021] 112: holding pad;
[0022] 120: exhaust pipe;
[0023] 130: support part;
[0024] 140: exhaust manifold;
[0025] 1401: contraction part;
[0026] 1402: extension part;
[0027] 1402a: edge;
[0028] 142a, 152a: upstream end portion
[0029] 142b, 152b: downstream end portion
[0030] 144: flange
[0031] 150: exhaust connection pipe
[0032] 160: gas sensor mounting boss
[0033] C: axial center
[0034] D1: horizontal direction
[0035] D2: vertical direction
[0036] D3: flow direction
[0037] F: exhaust flow
[0038] P1, P2: portion
[0039] S: flat surface
[0040] X, Y, Z: axial direction DETAILED DESCRIPTION
[0041] Reference will now be made in detail to the exemplary embodiments of the present application, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers will be used throughout the drawings and the description to refer to the same or like parts.
[0042] Figure 1 is a perspective view of an exhaust catalyst device according to an embodiment of the present application, which shows the axial directions X, Y, Z. Please refer to Figure 1 The exhaust catalyst device 100 according to the embodiment includes a catalytic converter 110, an exhaust pipe 120, and a support member 130. The catalytic converter 110 is vertically arranged in the up-down direction (axial direction Z) and connected to the engine body 50. The exhaust pipe 120 is integrally provided on the downstream side of the catalytic converter 110. The support member 130 is connected to the engine body 50 and the exhaust pipe 120 to support them.
[0043] Specifically, in the embodiment, as Figure 1As shown, the engine body 50, for example, refers to a cylinder of an internal combustion engine for a vehicle and includes a cylinder head 50A and a cylinder block 50B, and an exhaust portion of the engine body 50 can be provided with the exhaust catalyst device 100, which purifies pollutants in exhaust gas discharged from the engine body 50 through an exhaust manifold (not shown) by a catalytic converter 110 connected to the exhaust manifold and discharges the purified gas through an exhaust pipe 120. Thus, the catalytic converter 110 is, for example, installed in the cylinder head 50A (connecting the exhaust manifold inside the cylinder head 50A) and vertically arranged below the engine body 50 in the up-down direction (axial direction Z), and the exhaust pipe 120 is, for example, installed in the cylinder block 50B through a support member 130.
[0044] In the present embodiment, as shown in Figure 1 The exhaust manifold of the engine body 50 connects a plurality of combustion chambers and collects into a single exhaust port. In this way, the exhaust catalyst device 100 further includes a tapered member 140 as an exhaust collecting pipe. One end (upstream end portion 142a) of the tapered member 140 has a flange 144 and is welded and fixed to the cylinder head 50A of the engine body 50 by the flange 144, and connects the exhaust holes of the exhaust manifold. The flange 144 is, for example, constituted by a mounting piece provided on the upstream end portion 142a. Also, the other end (downstream end portion 142b) of the tapered member 140 is welded to the catalyst case of the catalytic converter 110 so as to send the exhaust gas from the engine body 50 to the catalytic converter 110. Thus, the tapered member 140 not only functions to send the exhaust gas of the engine body 50 to the catalytic converter 110, but also functions to install / fix the catalytic converter 110 to the engine body 50 (cylinder head 50A).
[0045] Similarly, in the present embodiment, as shown in Figure 1 The exhaust catalyst device 100 further includes an exhaust connecting pipe 150. The upstream end portion 152a of the exhaust connecting pipe 150 connects the catalytic converter 110, and the downstream end portion 152b of the exhaust connecting pipe 150 connects the exhaust pipe 120. That is, the upstream side of the catalytic converter 110 is connected to the exhaust manifold of the engine body 50 (cylinder head 50A) through the tapered member 140, and the downstream side of the catalytic converter 110 is connected to the exhaust pipe 120 through the exhaust connecting pipe 150. Also, the exhaust pipe 120 is connected (fixed) to the engine body 50 (cylinder block 50B) through the support member 120. The specific structure (combustion chamber, cylinder, exhaust manifold, etc.) of the engine body 50 such as an internal combustion engine can refer to the prior art, and will not be described here. The present application does not limit the connection mode between the engine body 50 and each component of the exhaust catalyst device 100 (does not limit whether the exhaust connecting pipe 150 is provided or not), and does not limit the specific structure and type of the engine body 50 (is not limited to an internal combustion engine), which can be adjusted according to needs.
[0046] Further, in the present embodiment, as shown in Figure 1 Fig. 2, the catalytic converter 110 is configured as a cylindrical catalyst case having an axis C, which accommodates a catalyst and connects the other end (downstream end portion 142b) of the conical member. Specifically, the catalyst case includes a carrier having a honeycomb structure in which a large number of cells are formed, and a catalyst material such as platinum or rhodium loaded on the carrier. The catalytic converter 110 has an inlet end face 110a and an outlet end face 110b, and exhaust gas from the engine body 50 flows into the catalytic converter 110 from the inlet end face 110a through the conical member 140, and exhaust gas purified by the catalytic converter 110 flows to the exhaust pipe 120 from the outlet end face 110b through the exhaust connection pipe 150. The specific structure of the catalytic converter 110 can be referred to the prior art, and will not be described here. The present application is not limited to the specific structure of the catalytic converter 110, which can be adjusted as needed.
[0047] Figure 2 is Figure 1 a partial cross-sectional view of the exhaust catalytic device. Please refer to Figure 2 , the conical member 140 of the present embodiment guides the exhaust gas flow at a right angle. That is, the exhaust gas flow enters the conical member 140 from the engine body 50 (shown in Figure 1 ) in a horizontal direction D1, and flows to the catalytic converter 110 in a vertical direction D2 after being guided by the conical member 140, the included angle between the horizontal direction D1 and the vertical direction D2 being a right angle. The catalyst is held in the catalyst case by the holding pad 112. The conical member 140 has a contraction portion 1401 and an extension portion 1402. The contraction portion 1401 is located on the upstream side of the exhaust gas flow and reduces the volume of the conical member 140, and the extension portion 1402 is located on the downstream side of the exhaust gas flow and guides the exhaust gas flow to the catalyst. Specifically, the cross-sectional area of the contraction portion 1401 of the conical member 140 is smaller than the cross-sectional area of the other end (downstream end portion 142b) of the conical member 140, so that the conical member 140 has a smaller volume at the contraction portion 1401, and the extension portion 1402 of the conical member 140 extends downward from the other end (downstream end portion 142b) to guide the exhaust gas flow downward to the catalyst.
[0048] As described above, in the exhaust catalytic device 100 of the present embodiment, the conical member 140 regulates the exhaust gas from the engine body 50 through the contraction portion 1401, and uniformly guides the exhaust gas to the catalyst case of the catalytic converter 110 through the extension portion 1402. Accordingly, the exhaust gas can uniformly flow to the catalyst case to make the temperature distribution of the catalyst uniform, to efficiently purify the exhaust gas by the catalyst, and to avoid local deterioration due to uneven temperature, and to suppress the wind erosion of the holding pad 112 by the exhaust gas flow. Thus, the exhaust catalytic device 100 of the present embodiment has good exhaust gas purification performance and durability.
[0049] Please refer to Figure 2 In this embodiment, the exhaust catalyst device 100 (indicated by the arrow Figure 1 ) further comprises an exhaust sensor mounting boss 160. The exhaust sensor mounting boss 160 is disposed on the conical member 140 and located between the converging portion 1401 and the extending portion 1402. Accordingly, the exhaust concentration sensor (not shown) mounted on the exhaust sensor mounting boss 160 senses the exhaust flow after being rectified by the converging portion 1401, and the sensing accuracy can be improved.
[0050] As shown in Figure 2 , the conical member 140 of this embodiment comprises two parts P1 and P2 combined with each other, the part P1 has the flange 144, and the part P2 has the converging portion 1401 and the extending portion 1402. As described above, the conical member 140 is divided into the part P1 provided with the flange 144 and the part P2 formed with the converging portion 1401 and the extending portion 1402, so that the converging portion 1401 and the extending portion 1402 can be easily integrally formed when the part P2 is manufactured by a stamping process.
[0051] Figure 3 is a schematic view of the conical member guiding the exhaust flow. Please refer to Figure 2 and Figure 2 In this embodiment, the extending portion 1402 of the conical member 140 has a flat surface S in the flow direction D3 (indicated by the arrow Figure 3 ) of the exhaust flow F (indicated by the arrow Figure 3 ). Moreover, the extending portion 1402 formed on the part P2 extends downwardly and protrudes relative to the part P1 to extend into the catalyst case. Accordingly, when the exhaust flow F reaches the extending portion 1402 along the flow direction D3, the extending portion 1402 provides sufficient guiding distance to avoid the flow direction of the exhaust flow F changing suddenly, so that the exhaust flow F can be smoothly guided to the catalytic converter 110, and the erosion of the retaining mat by the exhaust flow F is inhibited. Figure 3
[0052] is a partial sectional view of the exhaust catalyst device of another embodiment of the utility model. Figure 4 The difference between the embodiment shown in Figure 4 and the embodiment shown in Figure 2 is that the edge 1402a of the extending portion 1402 of the embodiment shown in Figure 4 bends towards the center of the catalyst. Accordingly, the concentration of the exhaust flow flowing to the local part of the retaining mat 112 can be more effectively avoided, so that the erosion of the local part of the retaining mat 112 by the exhaust flow can be more effectively inhibited.
[0053] In summary, in the exhaust catalytic device, the tapered member flows the exhaust from the engine body through the contraction part, and guides the exhaust to the catalyst box uniformly through the extension part.
[0054] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but not limited to them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.
Claims
1. An exhaust catalyst device characterized by comprising: Comprise: a catalytic converter including a catalyst case that houses a catalyst, the catalyst being held in the catalyst case by a holding pad; and a conical member having a flange at one end and welded to an engine body by the flange, the other end of the conical member being welded to the catalyst case, the conical member including two parts that are combined with each other, the conical member guiding an exhaust gas flow at a right angle, one of the two parts having a contraction portion and an extension portion that extends toward the catalyst, the contraction portion being located on an upstream side of the exhaust gas flow and reducing a volume of the conical member, the extension portion being located on a downstream side of the exhaust gas flow and guiding the exhaust gas flow toward the catalyst.
2. The exhaust gas catalytic device according to claim 1, wherein the extension portion has a flat surface in a flow direction of the exhaust gas flow, the extension portion extends into the catalyst case.
3. The exhaust gas catalytic device according to claim 2, wherein an edge of the extension portion is curved toward a center of the catalyst.
4. The exhaust gas catalytic device according to any one of claims 1 to 3, further comprising an exhaust gas sensor mounting boss, the exhaust gas sensor mounting boss being provided to the conical member and located between the contraction portion and the extension portion.