An exhaust device

Abstract

The application discloses an exhaust device, comprising: a shell with an air inlet and an air outlet; a reaction chamber arranged in the interior of the shell, the reaction chamber is equipped with a reaction agent, the reaction chamber comprises a first reaction chamber and a second reaction chamber, the first reaction chamber is located in the second reaction chamber; the first reaction chamber is communicated with the air inlet, the second reaction chamber is communicated with the air outlet, a first valve part is arranged between the second reaction chamber and the air inlet, the first valve part makes the exhaust gas through the air inlet preferentially enter the first reaction chamber; an air outlet cavity is arranged on the wall of the first reaction chamber, the air cavity extends along the axial direction and surrounds the wall of the first reaction chamber; the first reaction chamber is communicated with the air cavity so that the exhaust gas entering the first reaction chamber can enter the air cavity.

Description

Technical Field

[0001] This invention relates to an exhaust device for an engine. Background Technology

[0002] An engine's exhaust system is used to discharge the exhaust gases produced in the engine's combustion chamber. It is known that the exhaust system is also usually configured to treat harmful gases in the exhaust gases through a chemical reaction in order to meet emission requirements. Typically, the exhaust gases are passed through a reaction chamber containing a chemical reactant (such as a catalyst), during which the harmful gases in the exhaust gases are expected to be removed or transformed.

[0003] However, the removal or conversion of harmful gases in the reaction chamber is greatly affected by temperature; that is, if the chemical reaction temperature is low, the removal or conversion of harmful gases will be less effective.

[0004] When starting a moving vehicle engine in a low-temperature environment, the temperature in the reaction chamber of the exhaust system needs a relatively long time to be heated by the exhaust gas to a temperature suitable for normal chemical reactions. Therefore, it is difficult to achieve the desired removal or conversion effect of harmful gases in the exhaust gas emitted by the engine. To improve the treatment effect of the exhaust system on harmful gases when starting the engine in a low-temperature environment, the existing technology divides the internal reaction chamber of the exhaust system into two sub-reaction chambers. When starting the engine in a low-temperature environment, the exhaust gas preferentially passes through one of the sub-reaction chambers. In this way, by reducing the volume of the sub-reaction chamber, the rate of temperature rise in the sub-reaction chamber is increased, thereby improving the treatment effect on harmful gases.

[0005] However, the above-mentioned method in the prior art still results in a relatively slow rate of temperature increase in the reaction chamber. The reason is that in the prior art, the housing of the exhaust device is divided into two sub-reaction chambers by a partition. Therefore, the sub-reaction chamber is actually surrounded by the walls of the housing and the partition. This results in the sub-reaction chamber having a strong heat dissipation capacity, which in turn leads to a slow rate of temperature increase in the sub-reaction chamber. Summary of the Invention

[0006] In view of the above-mentioned technical problems existing in the prior art, embodiments of the present invention provide an exhaust device.

[0007] To solve the above-mentioned technical problems, the technical solution adopted in the embodiments of the present invention is as follows: An exhaust device, comprising: The housing has an air inlet and an air outlet located at the axial end. Exhaust gas emitted by the engine body enters the housing through the air inlet and exits through the air outlet. A reaction chamber, disposed inside the housing, contains a reactant. The reaction chamber includes a first reaction chamber and a second reaction chamber, with the first reaction chamber located within the second reaction chamber. The first reaction chamber is connected to the air inlet, and the second reaction chamber is connected to the air outlet. A first valve component is disposed between the second reaction chamber and the air inlet, allowing exhaust gas passing through the air inlet to preferentially enter the first reaction chamber. Wherein: An air outlet cavity is disposed on the wall surrounding the first reaction chamber, the air outlet cavity extending axially and surrounding the wall of the first reaction chamber; The first reaction chamber is connected to the gas chamber so that the waste gas entering the first reaction chamber can enter the gas chamber.

[0008] Preferably, the first reaction chamber has a plurality of first air holes on the wall near the air outlet, and the wall surrounding the air cavity has a plurality of second air holes on the side near the air inlet, so that the waste gas in the first reaction chamber enters the air cavity through the first air holes, flows in the opposite direction along the axial direction of the air cavity and is discharged from the second air holes and flows into the second reaction chamber.

[0009] Preferably, the exhaust device includes a central pipe located in the housing, the pipe wall of the central pipe forming the first reaction chamber, a partition is horizontally placed on the side of the housing near the air inlet, the central pipe passes through the partition and communicates with the air inlet; the partition is provided with circumferentially arranged hollow parts, and each hollow part is equipped with a first valve component; An outer sleeve is provided around the outer wall of the central tube, and the sleeve wall and the central tube wall form the air cavity. The two ends of the outer sleeve in the axial direction are closed. The first vent is located on the pipe wall of the central tube near the air outlet, and the second vent is located on the sleeve wall of the outer sleeve near the air inlet.

[0010] Preferably, the exhaust device further includes a guide sleeve, which is disposed around the outer periphery of the outer casing and defines an annular guide chamber with the outer casing, and is abutted against the partition plate; wherein: The central tube has a guide hole on the axial section of its wall near the partition. The guide sleeve and the outer sleeve define an annular constriction. The guide hole and the second air hole are located on opposite sides of the annular constriction in the axial direction. The guide hole allows exhaust gas passing through the air inlet to enter the guide chamber and pass through the annular constriction.

[0011] Preferably, the end of the central tube near the air outlet is closed.

[0012] Preferably, a second valve component is provided at one end of the central tube near the air outlet, the second valve component allowing the waste gas in the central tube to flow towards the air outlet.

[0013] Preferably, the exhaust device further includes an annular cylinder, which comprises an inner liner and an outer liner arranged coaxially. The wall of the inner liner and the wall of the outer liner define the first reaction chamber, and the annular cylinder and the housing define the second reaction chamber. The end of the annular cylinder near the outlet is closed, and the end near the inlet is open; wherein: An inner liner sleeve is disposed radially inside the inner liner cylinder, and the sleeve wall of the inner liner sleeve and the cylinder wall of the inner liner cylinder define an air cavity located inside the annular cylinder. An outer bushing is disposed radially outward from the inner liner, and the sleeve wall of the outer bushing and the cylinder wall of the outer liner define an air cavity located outside the annular cylinder. Both the outer liner and the inner liner have a first vent hole on their cylinder walls, and both the outer liner and the inner liner have a second vent hole on their cylinder walls.

[0014] Preferably, the air inlet extends axially into the interior of the housing to form an air inlet pipe, and the first valve component is mounted on the axial inner end of the air inlet pipe; wherein: A through-type component is disposed between the air intake pipe and the annular cylinder, the through-type component allowing the exhaust gas in the air intake pipe to enter the first reaction chamber defined by the annular cylinder.

[0015] Preferably, the first valve component and the second valve component are mechanical plate valves with opening pressure.

[0016] The present invention also discloses an engine for a mobile vehicle, including an engine body and the aforementioned exhaust device for connecting to an exhaust port of the engine body.

[0017] Compared with the prior art, the beneficial effects of the exhaust device disclosed in this invention are: By configuring air chambers around (inner and / or outer) the first reaction chamber to allow the flow of exhaust gas, the temperature rise rate of the first reaction chamber can be increased, thereby improving the treatment effect of harmful gases.

[0018] It should be understood that the foregoing general description and the following detailed description are exemplary and illustrative only, and are not intended to limit the invention.

[0019] The overview of various implementations or examples of the technology described in this invention is not a complete disclosure of the full scope or all features of the disclosed technology. Attached Figure Description

[0020] In drawings that are not necessarily drawn to scale, the same reference numerals may describe similar parts in different views. The same reference numerals with or without letter suffixes may indicate different instances of similar parts. The drawings generally illustrate various embodiments by way of example rather than limitation and, together with the description and claims, serve to explain embodiments of the invention. Where appropriate, the same reference numerals are used in all drawings to refer to the same or similar parts. Such embodiments are illustrative and not intended to be exhaustive or exclusive embodiments of the apparatus or method.

[0021] Figure 1 This is a schematic diagram illustrating the connection relationship between the exhaust device and the engine body, provided in an embodiment of the present invention.

[0022] Figure 2 A usage view of the exhaust device with a first specific structure provided for an embodiment of the present invention (state during engine cold start).

[0023] Figure 3 for Figure 2 A-direction view.

[0024] Figure 4 A usage view of the exhaust device with a first specific structure provided for an embodiment of the present invention (state after the engine has completed a low-temperature start-up).

[0025] Figure 5 This is a view of the exhaust system in use (the state after the engine has completed a cold start) of a preferred structure in the first specific structure.

[0026] Figure 6 A usage view of the exhaust device with a second specific structure provided for an embodiment of the present invention (state during engine cold start).

[0027] Figure 7 for Figure 6 View B.

[0028] Figure 8 A usage state view of the exhaust device with a second specific structure provided for an embodiment of the present invention (state after the engine has completed a low-temperature start-up).

[0029] Figure label: 10-Shell; 11-Inlet; 111-Inlet pipe; 12-Outlet; 21-First reaction chamber; 22-Second reaction chamber; 221-Outer sub-reaction chamber; 222-Inner sub-reaction chamber; 31-Gas chamber; 321-Gas chamber; 322-Gas chamber; 41-First air hole; 42-Second air hole; 51-First valve component; 52-First valve component; 61-Center pipe; 62-Outer sleeve; 63-Guide sleeve; 64-Guide chamber; 65-Annular constriction; 66-Guide hole; 67-Baffle plate; 68-Second valve component; 70-Annular cylinder; 71-Outer liner; 72-Inner liner; 73-Outer sleeve; 74-Inner sleeve; 80-Through component; 81-Guide pipe; 82-Cover; 100-Exhaust device; 200-Engine body; 300-Exhaust pipe. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the described embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0031] Unless otherwise defined, the technical or scientific terms used in this invention shall have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0032] To keep the following description of the embodiments of the present invention clear and concise, detailed descriptions of known functions and known components are omitted.

[0033] like Figure 1As shown, the present invention discloses an exhaust device 100, which is connected to the exhaust port of the engine body 200 of a mobile vehicle for guiding the exhaust gas from the combustion chamber of the engine body 200. In the present invention, when the exhaust gas passes through the exhaust device 100, the exhaust device 100 is dedicated to treating (removing or converting) harmful gases in the exhaust gas.

[0034] like Figures 1 to 8 As shown, the exhaust device 100 includes a housing 10 with an inlet 11 and an outlet 12 located at both ends in the axial direction. The inlet 11 is connected to the exhaust port of the engine body 200 via an exhaust pipe 300, and the outlet 12 is connected to the exhaust pipe 300 at the rear. Thus, exhaust gas from the engine body 200 enters the housing 10 through the inlet 11 and exits through the outlet 12. A reaction chamber is disposed inside the housing 10, and a reactant (such as a catalyst) is installed in the reaction chamber. The exhaust gas entering the housing 10 passes through the reaction chamber and, during its passage, undergoes a chemical reaction with the reactant to remove or transform harmful gases.

[0035] In this invention, the reaction chamber is divided into a first reaction chamber 21 and a second reaction chamber 22. Both the first reaction chamber 21 and the second reaction chamber 22 extend axially, meaning that both have two ends close to the air inlet 11 and the air outlet 12, respectively. The first reaction chamber 21 is located within the second reaction chamber 22, meaning that the first reaction chamber 21 is surrounded by the second reaction chamber 22, and therefore, the first reaction chamber 21 is not in contact with the external environment. The end of the first reaction chamber 21 near the air inlet 11 is connected to the air inlet 11. A first valve component 51, 52 is disposed between the end of the second reaction chamber 22 near the air inlet 11 and the air inlet 11. The first valve component 51, 52 controls the opening and closing of the air inlet 11 and the second reaction chamber 22, thereby allowing the exhaust gas to preferentially enter the first reaction chamber 21 through passive or active control of opening and closing.

[0036] In this invention, exhaust chambers 31, 321, and 321 are arranged on the wall surrounding the first reaction chamber 21. The exhaust chambers 31, 321, and 321 extend axially and surround the first reaction chamber 21. A first air hole 41 is provided on the side of the wall surrounding the first reaction chamber 21 near the exhaust port 12, and a second air hole 42 is provided on the side of the wall surrounding the exhaust chambers 31, 321, and 321 near the intake port 11. Thus, when the engine body 200 is started in a low-temperature environment, exhaust gas preferentially enters the first reaction chamber 21 through the intake port 11. Then, after passing through the first reaction chamber 21 axially, it enters the exhaust chambers 31, 321, and 321 through the first air hole 41. Then, it flows in the opposite direction axially (towards the intake port 11) in the exhaust chambers 31, 321, and 321, and is subsequently discharged from the second air hole 42 and flows into the second reaction chamber 22. During this process, since the first reaction chamber 21 is surrounded by gas cavities 31, 321, 321, and there is waste gas flowing in the gas cavities 31, 321, 321, the gas cavities 31, 321, 321 can serve as heat insulation cavities (layers) to suppress heat diffusion in the first reaction chamber 21, thereby facilitating a rapid increase in temperature in the first reaction chamber 21.

[0037] The present invention provides two specific structures of exhaust devices 100.

[0038] The first specific structure of the exhaust device 100.

[0039] In this structure, such as Figures 2 to 5 As shown, the exhaust device 100 specifically includes a central pipe 61, an outer sleeve 62, and a guide sleeve 63. The central pipe 61 is arranged at the axis of the housing 10, and the pipe wall of the central pipe 61 defines the first reaction chamber 21 (i.e., the pipe hole of the central pipe 61). Inside the housing 10, a partition 67 is horizontally placed on the side near the air inlet 11. The end of the central pipe 61 near the air inlet 11 is connected to the partition 67 and communicates with the air inlet 11. Multiple circumferentially arranged hollow parts are opened on the edge of the partition 67. Each hollow part is equipped with a first valve component 51. The first valve component 51 is a mechanical plate valve. The mechanical plate valve has a certain opening pressure. When the exhaust gas at the air inlet 11 is greater than the opening pressure, the hollow part is opened, and when it is less than the opening pressure, the hollow part is closed. The outer sleeve 62 is fitted over the central tube 61. The two ends of the outer sleeve 62 extend to the axial sections near the air inlet 11 and the air outlet 12, respectively. The two ends of the outer sleeve 62 are respectively configured to be closed. The sleeve wall of the outer sleeve 62 and the tube wall of the central tube 61 define the air outlet chamber 31. The first air hole 41 is opened on the tube wall of the central tube 61 and arranged circumferentially along the tube wall of the central tube 61. The second air hole 42 is opened on the sleeve wall of the outer sleeve 62 and arranged circumferentially along the sleeve wall. The first air hole 41 is inclined toward the air inlet 11, and the second air hole 42 is inclined toward the air outlet 12.

[0040] The guide sleeve 63 is located near the air inlet 11 and is fitted over the outer sleeve 62 and the central tube 61. The guide sleeve 63, the outer sleeve 62, and the central tube 61 define an annular guide chamber 64, which is also filled with a reactant. The end of the guide sleeve 63 facing the air inlet 11 is connected to the partition 67. The sleeve wall of the guide sleeve 63 has an annular inward protrusion, thereby defining an annular constriction 65 on the guide chamber 64. The central tube 61 has a number of guide holes 66 on its wall near the partition 67, which are arranged circumferentially along the tube wall.

[0041] The end of the central tube 61 near the outlet 12 is configured to be closed or equipped with a second valve component 68 that has the same structure and working principle as the first valve component 51. For example, the second valve component 68 is a mechanical plate valve.

[0042] The working process of the exhaust device 100 is described below.

[0043] like Figure 2 As shown, when the engine body 200 is started in a low-temperature environment, the exhaust gas enters the first reaction chamber 21 enclosed by the central tube 61 through the air inlet 11. At the same time, some exhaust gas enters the guide chamber 64 through the guide hole 66. The exhaust gas entering the first reaction chamber 21 flows axially towards the air outlet 12, and then flows into the air chamber 31 outside the central tube 61 through the first air hole 41. Subsequently, the exhaust gas in the air chamber 31 flows towards the air inlet 11 and is discharged from the second air hole 42 and flows into the guide chamber 64 located downstream of the annular constriction 65. The exhaust gas entering the guide chamber 64 upstream of the annular constriction 65 through the guide hole 66 has a reduced pressure and increased flow velocity after passing through the annular constriction 65, thereby attracting the exhaust gas from the air chamber 31. This helps to reduce the throttling pressure generated when the exhaust gas passes through the air chamber 31 and helps to increase the flow velocity and flow rate of the exhaust gas passing through the air chamber 31. The exhaust gas flows along the guide chamber 64 toward the outlet 12 and then flows out from the port of the guide chamber 64 into the second reaction chamber 22 around the guide sleeve 63, and then flows out from the outlet 12.

[0044] If the exhaust gas produced during a cold start is large and has high pressure, or if the exhaust gas is large and has high pressure due to the completion of a cold start and / or the increased engine power of the moving vehicle, the mechanical plate valve (if present) of the second valve component 68 opens first, so that a portion of the exhaust gas after passing through the central pipe 61 is discharged from the port of the central pipe 61. If the exhaust gas volume is even larger and the pressure is even higher, the mechanical plate valve of the first valve component 51 then also opens to reduce the throttling pressure. If the second valve component 68 is not present, the first valve component 51 opens.

[0045] The exhaust device 100 with the above-described structure has the following advantages: 1. The air chamber 31 located on the radial outer side of the central tube 61 can effectively suppress the heat diffusion in the first reaction chamber 21 inside the central tube 61, thereby enabling the temperature inside the first reaction chamber 21 to rise rapidly during low-temperature start-up, which is beneficial to improving the treatment effect of harmful gases in the exhaust gas.

[0046] 2. By configuring the flow guide chamber 64, the flow path of the exhaust gas can be extended, and the temperature rise rate of the extended flow path is not low. Furthermore, by configuring the annular constriction 65, the throttling pressure can be reduced.

[0047] The second specific structure of the exhaust device 100.

[0048] In this structure, such as Figures 6 to 8 As shown, the exhaust device 100 specifically includes an annular cylinder 70, an inner liner 74, and an outer liner 73. The annular cylinder 70 is located within the housing 10 and includes an inner liner 72 and an outer liner 71. A first reaction chamber 21 is defined between the inner liner 72 and the outer liner 71. The side of the annular cylinder 70 near the outlet 12 is closed, while the side near the inlet 11 is open. The inlet 11 of the housing 10 extends axially inward to form an inlet pipe 111. A first valve component 52 is installed at the inner end of the inlet pipe 111. This first valve component 52 is related to the first valve component in the first specific structure. The mechanical plate valve of 51 has the same structure and working principle. A through component 80 is installed between the intake pipe 111 and the open end of the annular cylinder 70. The through component 80 includes a plurality of circumferentially arranged guide pipes 81 extending from the pipe wall of the intake pipe 111 and a cover 82 fastened to the port of the annular cylinder 70. The guide pipes 81 extend and connect to the cover 82, so that the exhaust gas passing through the intake pipe 111 can enter the first reaction chamber 21 defined by the annular cylinder 70 through the guide pipes 81.

[0049] In this structure, the second reaction chamber 22 includes an inner sub-reaction chamber 222 defined by the wall of the inner liner 72 of the annular cylinder 70 and an outer sub-reaction chamber 221 defined by the outer liner 71 and the shell wall of the housing 10.

[0050] An inner liner 74 is arranged radially inside the inner liner 72. The sleeve wall of the inner liner 74 and the cylinder wall of the inner liner 72 define an air cavity 322 located inside the annular cylinder 70. An outer liner 73 is arranged radially outside the inner liner 72. The sleeve wall of the outer liner 73 and the cylinder wall of the outer liner 71 define an air cavity 321 located outside the annular cylinder 70. A first air hole 41 is provided on the cylinder wall of both the outer liner 71 and the inner liner 72. A second air hole 42 is provided on the cylinder wall of both the outer liner 73 and the inner liner 74.

[0051] The working process of the exhaust device 100 is described below.

[0052] like Figure 6As shown, when the engine body 200 is started in a low-temperature environment, the exhaust gas enters the first reaction chamber 21 defined by the annular cylinder 70 through the air inlet 11 and the air inlet pipe 111. The exhaust gas entering the first reaction chamber 21 flows axially toward the air outlet 12. Then, it enters the radially outer air chamber 321 and the radially inner air chamber 322 through the first air holes 41 on the outer liner 71 and the inner liner 72, respectively. Then, the exhaust gas in the radially outer air chamber 321 and the radially inner air chamber 322 both flow toward the air inlet 11. Then, it is discharged through the second air holes 42 on the outer bushing 73 and the inner bushing 74, respectively, and enters the outer sub-reaction chamber 221 and the inner sub-reaction chamber 222, respectively. Then, it flows axially and is discharged from the air outlet 12.

[0053] like Figure 8 As shown, if the exhaust gas generated during a low-temperature start is large and the pressure is high, or if the exhaust gas is large and the pressure is high due to the completion of a low-temperature start and / or the increased engine power of the moving vehicle, the first valve component 52 opens to accommodate the exhaust gas flow and reduce the throttling pressure.

[0054] The exhaust device 100 with the above-described structure has the following advantages: 1. The air chamber 321 located on the outside of the annular cylinder 70 and the air chamber 322 located on the inside can effectively suppress the heat diffusion in the annular first reaction chamber 21 defined by the annular cylinder 70, thereby enabling the temperature in the first reaction chamber 21 to rise rapidly during low-temperature start-up, which is beneficial to improving the treatment effect of harmful gases in the exhaust gas.

[0055] 2. The annular first reaction chamber 21 is defined by the annular cylinder 70. The gap between the inner wall and the outer wall of the first reaction chamber 21 can be designed to be as small as possible. In this way, the temperature of the first reaction chamber 21 can rise rapidly. The increase in throttling pressure caused by reducing the gap can be compensated by increasing the radial dimension of the annular cylinder 70.

[0056] Furthermore, although exemplary embodiments have been described in this invention, their scope includes any and all embodiments based on the invention that have equivalent elements, modifications, omissions, combinations (e.g., schemes involving intersections of various embodiments), adaptations, or alterations. Elements in the claims will be interpreted broadly based on the language used in the claims and are not limited to the examples described in this specification or during the implementation of this application, and such examples will be interpreted as non-exclusive. Therefore, this specification and examples are intended to be considered illustrative only, and the true scope and spirit are indicated by the full scope of the following claims and their equivalents.

[0057] The above description is intended to be illustrative and not restrictive. For example, the above examples (or one or more of them) can be used in combination with each other. Other embodiments may be used by those skilled in the art upon reading the above description. Furthermore, in the above detailed description, various features may be grouped together to simplify the invention. This should not be construed as an intention that a disclosed feature, which is not claimed, is necessary for any claim. Rather, the subject matter of the invention may be less than all the features of the particular disclosed embodiment. Thus, the following claims are incorporated herein by reference as examples or embodiments, wherein each claim is independently considered as a separate embodiment, and these embodiments are contemplated as being possible in various combinations or arrangements. The scope of the invention should be determined by reference to the appended claims and the full scope of their equivalents.

[0058] The above embodiments are merely exemplary embodiments of the present invention and are not intended to limit the present invention. The scope of protection of the present invention is defined by the claims. Those skilled in the art can make various modifications or equivalent substitutions to the present invention within its spirit and scope of protection, and such modifications or equivalent substitutions should also be considered to fall within the scope of protection of the present invention.

Claims

1. An exhaust device, characterized in that, include: The housing has an air inlet and an air outlet located at the axial end. Exhaust gas emitted by the engine body enters the housing through the air inlet and exits through the air outlet. A reaction chamber, disposed inside the housing, contains a reactant. The reaction chamber includes a first reaction chamber and a second reaction chamber, with the first reaction chamber located within the second reaction chamber. The first reaction chamber is connected to the air inlet, and the second reaction chamber is connected to the air outlet. A first valve component is disposed between the second reaction chamber and the air inlet, allowing exhaust gas passing through the air inlet to preferentially enter the first reaction chamber. Wherein: An air outlet cavity is disposed on the wall surrounding the first reaction chamber, the air outlet cavity extending axially and surrounding the wall of the first reaction chamber; The first reaction chamber is connected to the gas chamber so that the waste gas entering the first reaction chamber can enter the gas chamber.

2. The exhaust device according to claim 1, characterized in that, The first reaction chamber has a number of first air holes on the wall near the air outlet, and the wall surrounding the air cavity has a number of second air holes on the side near the air inlet, so that the waste gas in the first reaction chamber enters the air cavity through the first air holes, flows in the opposite direction along the axial direction of the air cavity and is discharged from the second air holes and flows into the second reaction chamber.

3. The exhaust device according to claim 2, characterized in that, The exhaust device includes a central pipe located in the housing. The wall of the central pipe forms the first reaction chamber. A partition is horizontally placed on the side of the housing near the air inlet. The central pipe passes through the partition and communicates with the air inlet. The partition is provided with circumferentially arranged hollow parts, and a first valve component is installed on each hollow part. An outer sleeve is provided around the outer wall of the central tube, and the sleeve wall and the central tube wall form the air cavity. The two ends of the outer sleeve in the axial direction are closed. The first vent is located on the pipe wall of the central tube near the air outlet, and the second vent is located on the sleeve wall of the outer sleeve near the air inlet.

4. The exhaust device according to claim 3, characterized in that, The exhaust device further includes a guide sleeve, which is disposed around the outer casing and defines an annular guide chamber with the outer casing and the central tube, and is connected to the partition plate; wherein: A flow guide hole is provided on the axial section of the pipe wall near the partition of the central tube. The flow guide sleeve and the outer sleeve define an annular constriction. The flow guide hole and the second air hole are located on both sides of the annular constriction in the axial direction. The flow guide hole allows the exhaust gas passing through the air inlet to enter the flow guide chamber and pass through the annular constriction.

5. The exhaust device according to claim 3, characterized in that, The end of the central tube near the air outlet is closed.

6. The exhaust device according to claim 3, characterized in that, A second valve component is provided at one end of the central tube near the air outlet, the second valve component allowing the waste gas in the central tube to flow toward the air outlet.

7. The exhaust device according to claim 2, characterized in that, The exhaust device further includes an annular cylinder, which comprises an inner liner and an outer liner arranged coaxially. The wall of the inner liner and the wall of the outer liner define the first reaction chamber. The annular cylinder and the housing define the second reaction chamber. The end of the annular cylinder near the outlet is closed, and the end near the inlet is open. An inner liner sleeve is disposed radially inside the inner liner cylinder, and the sleeve wall of the inner liner sleeve and the cylinder wall of the inner liner cylinder define an air cavity located inside the annular cylinder. An outer bushing is disposed radially outward from the inner liner, and the sleeve wall of the outer bushing and the cylinder wall of the outer liner define an air cavity located outside the annular cylinder. Both the outer liner and the inner liner have a first vent hole on their cylinder walls, and both the outer liner and the inner liner have a second vent hole on their cylinder walls.

8. The exhaust device according to claim 7, characterized in that, The air inlet extends axially into the interior of the housing to form an air inlet pipe, and the first valve component is installed at the axial inner end of the air inlet pipe; wherein: A through-type component is disposed between the air intake pipe and the annular cylinder, the through-type component allowing the exhaust gas in the air intake pipe to enter the first reaction chamber defined by the annular cylinder.

9. The exhaust device according to claim 6, characterized in that, The first valve component and the second valve component are mechanical plate valves with opening pressure.

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