CN212479377U - Secondary air supplementing device and engine - Google Patents

Abstract

The utility model relates to a secondary air supplement unit and engine utilizes pollutant content inhomogeneity in time in the waste gas, in time carries out the secondary air through the air supplement pipe in to the exhaust passage and supplyes, improves the tonifying qi effect. Meanwhile, when the exhaust valve is opened or closed, the valve lift is small, so that the flow of the waste gas in the combustion chamber entering the exhaust passage is small, the flow speed is low, and the flow speed gradient of the waste gas on each cross section in the exhaust passage is large, so that more waste gas flows along the inner surface of the exhaust passage far away from the combustion chamber. Therefore, this air supplement unit sets up the gas outlet on first pipe face for the secondary air who mends from the air supplement pipe can be caught by more waste gas fast, accelerates the oxidation reaction of pollutant in the waste gas, effectively reduces the emission of pollutant, consequently, no matter in time or in the space, all help in time to mend the secondary air through this air supplement unit, reduces the emission of pollutant in the waste gas.

Description

Secondary air supplementing device and engine

Technical Field

The utility model relates to the technical field of engines, especially, relate to secondary air supplement unit and engine.

Background

In order to reduce the emission and meet the requirements of the regulations, the oil supply mode of the motor vehicle is gradually switched from the carburetor to an electronic fuel injection system, and certainly, the carburetor is still reserved in part of regions. However, no matter which type of oil supply, there are open-loop (the mixture is rich and lean and cannot be fed back and adjusted in time) oil supply conditions, and the emission problem caused by these conditions is not negligible. Therefore, the secondary air supplementing system can compensate for short plates of electronic injection open-loop control as a device for effectively reducing emission on one hand, and effectively reduce emission of a carburetor on the other hand.

The traditional secondary air supplementing system is limited by the structure of the system, so that the secondary air supplementing system and the exhaust system are not matched well, fresh air is not supplemented into the exhaust system in time, more high-temperature waste gas is guided to the secondary air supplementing system from the exhaust system, waste gas counter flow is formed, and burning loss of a reed valve sealing device in the secondary air supplementing system can be caused in serious cases. Meanwhile, the installation operation of the conventional secondary air make-up system on the exhaust system becomes complicated due to the structural defects thereof.

SUMMERY OF THE UTILITY MODEL

Therefore, a secondary air supplementing device and an engine are needed to be provided, so that the secondary air is effectively supplemented, the emission of pollutants is reduced, the reverse flow of waste gas to an air supplementing system is effectively reduced, and the risk of blockage of the air supplementing system is avoided; meanwhile, the reasonable structural arrangement is also ensured, and the air supplement structure is convenient to install.

A secondary air supplement device, comprising: a combustion chamber; the exhaust passage is arranged on the combustion chamber and communicated with the combustion chamber, a surface passing through the central line of the exhaust passage is used as a cutting surface, the inner surface of the exhaust passage is divided into a first pipe surface and a second pipe surface which are oppositely arranged, the first pipe surface is far away from the combustion chamber relative to the second pipe surface, and a gas outlet is arranged on the first pipe surface; and the air supplementing pipe is arranged on the exhaust passage and is communicated with the exhaust passage through the air outlet, one port of the air supplementing pipe, which is far away from the exhaust passage, is an air inlet, and the air inlet is positioned on one side of the air outlet, which faces the second pipe surface.

The secondary air supplementing device utilizes the nonuniformity of the pollutant content in the waste gas in time, namely, when the exhaust valve of the combustion chamber is just opened and the exhaust valve is closed quickly, the emission of the pollutant content can generate a peak value, and the secondary air is supplemented in the exhaust passage in time through the air supplementing pipe, so that the air supplementing effect is improved. Meanwhile, when the exhaust valve is opened or closed, the valve lift is small, so that the flow of the waste gas in the combustion chamber entering the exhaust passage is small, the flow speed is low, and the flow speed gradient of the waste gas on each cross section in the exhaust passage is large, so that more waste gas flows along the inner surface of the exhaust passage far away from the combustion chamber, namely more waste gas flows on the upper inner surface of the exhaust passage in a concentrated mode relative to the combustion chamber. Therefore, the air supply device divides the inner surface of the exhaust passage into: two upper and lower tube faces relative to the combustion chamber to set up the gas outlet on first tube face, make the secondary air who mends from the air supplement pipe can be caught by more waste gas fast, accelerate the oxidation reaction of pollutant in the waste gas, effectively reduce the emission of pollutant, consequently, no matter in time or in the space, all help in time to mend the secondary air through this air supplement unit, reduce the emission of pollutant in the waste gas. In addition, when a pressure peak occurs in the exhaust passage, the discharged exhaust gas may generate a reverse flow phenomenon, that is, the discharged exhaust gas is returned to the combustion chamber from the exhaust passage, at this time, the exhaust gas flow velocity gradient is large, and more exhaust gas is concentrated on the second pipe surface to flow. Because the gas outlet sets up on first tube face, consequently, the waste gas of adverse current seldom gets into in the air supplement pipe, effectively reduces the back flow that waste gas got into secondary air supplement system from the exhaust passage like this, effectively avoids secondary air supplement system to take place to block up the risk. In addition, this air supplement unit is located the air inlet in the one side of air outlet orientation second pipe surface, makes the installation of air supplement pipe on the engine have sufficient operating space like this to it is more convenient to make secondary air supplement unit's integral erection.

In one embodiment, the exhaust passage is arranged in a bending mode along a direction deviated to the combustion chamber, the center line of the exhaust passage is bent to form a bending plane, the intercepting surface is perpendicular to the bending plane, and the intercepting surface divides the inner surface of the exhaust passage into the first pipe surface and the second pipe surface.

In one embodiment, the combustion chamber has a cylinder axis, and the position of the intake port with respect to the first tube surface is lower than the position of the exhaust port on the first tube surface in the direction of the cylinder axis.

In one embodiment, the air supply pipe comprises a first branch pipe and a second branch pipe, one end of the first branch pipe is communicated with the second branch pipe, the other end of the first branch pipe is the air inlet, and the second branch pipe is arranged on the exhaust passage and is communicated with the inside of the exhaust passage through the air outlet.

In one embodiment, the second branch pipe includes a first pipe section and a second pipe section, the first pipe section is used for being mounted on the second heat dissipation structure and is communicated with the exhaust passage through the air outlet, one end of the second pipe section is communicated with the first pipe section, and the other end of the second pipe section is communicated with the first branch pipe.

In one embodiment, the second branch pipe further comprises a third pipe section, the second pipe section is communicated with the first branch pipe through the third pipe section, and the third pipe section and the second pipe section are arranged at an included angle.

In one embodiment, the first pipe section is arranged obliquely on the exhaust passage.

In one embodiment, the secondary air make-up device further comprises a first control valve, the first control valve is arranged on the exhaust passage, and the first control valve is used for controlling the connection and disconnection between the combustion chamber and the exhaust passage.

In one embodiment, the secondary air supply device further comprises an air inlet pipe and a second control valve, the air inlet pipe is used for being arranged on the second heat dissipation structure and communicated with the combustion chamber, the second control valve is arranged on the air inlet pipe, and the second control valve is used for controlling the on-off between the combustion chamber and the air inlet pipe.

An engine comprises a first heat dissipation structure, a second heat dissipation structure and any one of the heat dissipation structures, wherein the second heat dissipation structure is arranged on the first heat dissipation structure, a combustion chamber and an exhaust passage are arranged in the second heat dissipation structure, an air supplementing pipe is arranged on the first heat dissipation structure, an air inlet is positioned on the first heat dissipation structure, and one end of the air supplementing pipe, far away from the air inlet, is communicated with an air outlet.

The secondary air supply device of the engine utilizes the nonuniformity of the pollutant content in the waste gas in time, namely, when the exhaust valve of the combustion chamber is just opened and the exhaust valve is closed quickly, the emission of the pollutant content can generate a peak value, and the secondary air supply is carried out in the exhaust passage in time through the air supply pipe, so that the air supply effect is improved. Meanwhile, when the exhaust valve is opened or closed, the valve lift is small, so that the flow of the waste gas in the combustion chamber entering the exhaust passage is small, the flow speed is low, and the flow speed gradient of the waste gas on each cross section in the exhaust passage is large, so that more waste gas flows along the inner surface of the exhaust passage far away from the combustion chamber, namely more waste gas flows on the upper inner surface of the exhaust passage in a concentrated mode relative to the combustion chamber. Therefore, the air supply device divides the inner surface of the exhaust passage into: two upper and lower tube faces relative to the combustion chamber to set up the gas outlet on first tube face, make the secondary air who mends from the air supplement pipe can be caught by more waste gas fast, accelerate the oxidation reaction of pollutant in the waste gas, effectively reduce the emission of pollutant, consequently, no matter in time or in the space, all help in time to mend the secondary air through this air supplement unit, reduce the emission of pollutant in the waste gas. In addition, when a pressure peak occurs in the exhaust passage, the discharged exhaust gas may generate a reverse flow phenomenon, that is, the discharged exhaust gas is returned to the combustion chamber from the exhaust passage, at this time, the exhaust gas flow velocity gradient is large, and more exhaust gas is concentrated on the second pipe surface to flow. Because the gas outlet sets up on first tube face, consequently, the waste gas of adverse current seldom gets into in the air supplement pipe, effectively reduces the back flow that waste gas got into secondary air supplement system from the exhaust passage like this, effectively avoids secondary air supplement system to take place to block up the risk. In addition, this air supplement unit is located the air inlet in the one side of air outlet orientation second pipe surface, makes the installation of air supplement pipe on the engine have sufficient operating space like this to it is more convenient to make secondary air supplement unit's integral erection.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification.

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

FIG. 1 is a perspective view of an exemplary embodiment of a secondary air supply apparatus;

FIG. 2 is another perspective view of the secondary air supply apparatus in one embodiment;

FIG. 3 is a schematic diagram of an embodiment of an exhaust stack;

FIG. 4 is a flow curve, pressure wave curve in the exhaust passage, and valve opening curve of the secondary air supply system according to an embodiment;

FIG. 5 is a flow field profile within the exhaust passage during an exhaust process according to one embodiment;

FIG. 6 is a flow field profile in the stack during a reverse flow process according to one embodiment;

FIG. 7 is a schematic illustration of an engine configuration according to one embodiment;

FIG. 8 is a cross-sectional view of an engine configuration according to one embodiment.

100. A gas supplementing device; 110. a combustion chamber; 111. a cylinder axis; 120. an exhaust passage; 121. intercepting a surface; 122. an air outlet; 123. a first tube face; 124. a second tube face; 125. a centerline; 126. bending a plane; 127. a recess; 130. a gas supplementing pipe; 131. an air inlet; 132. a first branch pipe; 133. a second branch pipe; 1331. a first tube section; 1332. a second tube section; 1333. a third tube section; 140. a first control valve; 150. an air inlet pipe; 160. a second control valve; 200. a first heat dissipation structure; 300. a second heat dissipation structure; 400. and a gasket.

Detailed Description

In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, as those skilled in the art will be able to make similar modifications without departing from the spirit and scope of the present invention.

In one embodiment, referring to FIG. 1, a secondary air supply apparatus 100, the secondary air supply apparatus 100 includes a combustion chamber 110, an exhaust passage 120, and an air supply pipe 130. The exhaust passage 120 is installed on the combustion chamber 110 and communicates with the combustion chamber 110. The surface passing through the center line 125 of the exhaust passage 120 is taken as a cutting surface 121, and the inner surface of the exhaust passage 120 is divided into a first pipe surface 123 and a second pipe surface 124 which are oppositely arranged. The first tube surface 123 is disposed away from the combustion chamber 110 relative to the second tube surface 124, and the first tube surface 123 is provided with an air outlet 122. The air supply pipe 130 is installed on the exhaust passage 120 and is communicated with the exhaust passage 120 through the air outlet 122. One end of the air supplement pipe 130 away from the air discharge passage 120 is an air inlet 131, and the air inlet 131 is located on one side of the air outlet 122 facing the second pipe surface 124.

The secondary air supply device 100 utilizes the non-uniformity of the pollutant content in the waste gas in time, that is, when the exhaust valve of the combustion chamber 110 is just opened and the exhaust valve is closed quickly, the emission of the pollutant content can generate a peak value, and the secondary air supply is performed in the exhaust passage 120 in time through the air supply pipe 130, so that the air supply effect is improved. Meanwhile, when the exhaust valve is opened or closed, the valve lift is small, resulting in a small flow rate and a low flow velocity of the exhaust gas in the combustion chamber 110 entering the exhaust passage 120, and a large exhaust gas flow velocity gradient at each cross section in the exhaust passage 120, resulting in more exhaust gas flowing along the inner surface of the exhaust passage 120 farther from the combustion chamber 110, i.e., more exhaust gas flowing intensively on the upper inner surface of the exhaust passage 120 relative to the combustion chamber 110. Therefore, the air supply device 100 divides the inner surface of the exhaust passage 120 into: two upper and lower tube faces relative to combustion chamber 110 to set up gas outlet 122 on first tube face 123, make the secondary air who mends from air supplement pipe 130 can be caught by more waste gas fast, accelerate the oxidation reaction of pollutant in the waste gas, effectively reduce the emission of pollutant, consequently, no matter in time or in the space, all help in time to mend the secondary air through this air supplement unit 100, reduce the emission of pollutant in the waste gas. In addition, when a pressure peak occurs in the exhaust passage 120, the discharged exhaust gas may generate a reverse flow phenomenon, that is, the discharged exhaust gas is returned from the exhaust passage 120 to the combustion chamber 110, and at this time, the exhaust gas flow velocity gradient is large and more exhaust gas is concentrated on the second tube surface 124 to flow. Because the air outlet 122 is arranged on the first pipe surface 123, the backflow waste gas rarely enters the air supplementing pipe 130, so that the backflow quantity of the waste gas entering the secondary air supplementing system from the exhaust passage 120 is effectively reduced, and the risk of blocking the secondary air supplementing system is effectively avoided. In addition, the air inlet 131 of the air supplement device 100 is located on the side of the air outlet 122 facing the second tube surface 124, so that the air supplement tube 130 has sufficient operating space for installation on the engine, and the overall installation of the secondary air supplement device 100 is more convenient.

It should be noted that the centerline 125 of the exhaust passage 120 is understood as: the exhaust duct 120 is taken in a plane perpendicular to the axis of the exhaust duct 120 to obtain cross sections, and a line connecting the centers of each cross section is a center line 125 of the exhaust duct 120. Meanwhile, the present embodiment defines that the first tube face 123 is disposed away from the combustion chamber 110 with respect to the second tube face 124, with the purpose of: the inner surface of the exhaust passage 120 can be divided into two parts: one part is close to the combustion chamber 110, and the other part is far from the combustion chamber 110, so that most of the exhaust gas discharged from the combustion chamber 110 flows on the first pipe surface 123 when the valve is just opened or closed; when the reverse flow occurs due to a pressure spike in the exhaust passage 120, most of the exhaust gas flows on the second pipe surface 124. Meanwhile, the pollutants of the present embodiment may be carbon monoxide (CO), Hydrocarbons (HC), Nitrogen Oxides (NOX), and the like, and particulate pollutants (or particulate pollutants), and the like.

Specifically, the pollutant is a Hydrocarbon (HC).

It should be noted that, to specifically describe the operation principle of the air make-up process, please refer to fig. 4, where fig. 4 is a graph of a flow curve (D in fig. 4), a pressure wave curve (F in fig. 4) in the exhaust passage 120, and a valve opening curve (E in fig. 4) of the secondary air make-up system. As can be seen from fig. 4, the two ends of the valve opening curve are in two states when the valve is just opened or just closed, and at this time, the pressure wave in the corresponding exhaust passage 120 is low, which is suitable for supplementing the secondary air, i.e., supplementing air at the ring a and the ring B. When the pressure wave in the exhaust passage 120 reaches a peak value, which corresponds to circle C in fig. 4, the exhaust gas backflow phenomenon occurs in the exhaust passage 120.

Referring to fig. 5, fig. 5 is a flow field distribution diagram of the exhaust passage 120 during the exhaust process. When the air supply pipe 130 supplies air into the exhaust passage 120, most of the exhaust gas flows on an inner surface of the exhaust passage 120 away from the combustion chamber 110, and if the combustion chamber 110 is vertically disposed, it is understood that most of the exhaust gas flows on an upper inner surface of the exhaust passage 120. Meanwhile, referring to fig. 6, fig. 6 is a flow field distribution diagram in the exhaust duct 120 during the reverse flow process. When the exhaust gas is redirected into the combustion chamber 110, most of the exhaust gas flows on an inner surface of the exhaust passage 120 near the combustion chamber 110, and if the combustion chamber 110 is vertically disposed, it is understood that most of the exhaust gas flows on an inner surface of the exhaust passage 120 located below.

Further, referring to fig. 1 and 3, the exhaust passage 120 is curved in a direction deviating from the combustion chamber 110. The centerline 125 of the exhaust passageway 120 is curved to form a plane of inflection 126. The cut-off surface 121 is perpendicular to the bending plane 126, and the cut-off surface 121 divides the inner surface of the exhaust passage 120 into a first pipe surface 123 and a second pipe surface 124. Therefore, the exhaust passage 120 is of a bent pipe structure, and the bending direction of the exhaust passage 120 is set towards the combustion chamber 110, so that the formed bending plane 126 can divide the exhaust passage 120 into a left half part and a right half part uniformly; then, the exhaust passage 120 is intercepted by a intercepting surface 121 which is vertically bent to the plane 126 and passes through the central line 125 of the exhaust passage 120, so that the exhaust passage 120 is uniformly divided into an upper half part and a lower half part, and a large amount of secondary air is captured by waste gas during air supplement; and the waste gas is more effectively prevented from entering the air supplementing system during the reverse flow.

Specifically, referring to fig. 1, when the first pipe surface 123 and the second pipe surface 124 are separated, parallel lines parallel to the end surfaces of the combustion chamber 110 are respectively made on the center line 125 of the exhaust passage 120 with reference to the end surfaces of the combustion chamber 110; all parallel lines are then integrated with the centerline 125 to form the intercept plane 121. In order to facilitate understanding of the end surface of the combustion chamber 110 of the present embodiment, fig. 1 is taken as an example, and the end surface of the combustion chamber 110 is denoted by S in fig. 1.

In one embodiment, referring to FIG. 1, combustion chamber 110 has a cylinder axis 111. In the direction of the cylinder axis 111, the position of the air inlet 131 relative to the first pipe surface 123 is lower than the position of the air outlet 122 on the first pipe surface 123, that is, the air inlet 131 is arranged lower than the air outlet 122 when the position is designed, so that the air supplementing pipe 130 has sufficient operating space during the installation process, and the installation of the secondary air supplementing device 100 is more convenient without damaging the degree of freedom and appearance of the overall arrangement of the engine.

In one embodiment, referring to fig. 2, the outer surface of the exhaust passage 120 is recessed toward the exhaust passage 120 to form a recess 127, the air outlet 122 penetrates through the first pipe surface 123 to the sidewall of the recess 127, and one end of the air supplement pipe 130 is mounted on the sidewall of the recess 127 and is communicated with the air outlet 122.

In one embodiment, referring to fig. 1, the air supply pipe 130 includes a first branch pipe 132 and a second branch pipe 133. One end of the first branch pipe 132 is communicated with the second branch pipe 133, and the other end of the first branch pipe 132 is an air inlet 131. The second branch pipe 133 is provided on the exhaust passage 120 and communicates with the interior of the exhaust passage 120 through the outlet port 122, thus dividing the exhaust passage 120 into two branch pipes, making the arrangement of the exhaust passage 120 on the engine more convenient.

Alternatively, the connection between the first branch pipe 132 and the second branch pipe 133 may be a threaded connection, an expansion sleeve connection, an adhesive, a welding, a flange connection, an integral molding, or the like.

Further, referring to fig. 1, the second branch pipe 133 includes a first pipe section 1331 and a second pipe section 1332. The first pipe section 1331 is installed on the second heat dissipation structure 300 and is communicated with the inside of the exhaust duct 120 through the air outlet 122, one end of the second pipe section 1332 is communicated with the first pipe section 1331, the other end of the second pipe section 1332 is communicated with the first branch pipe 132, because the air outlet 122 is arranged on the first pipe surface 123 of the exhaust duct 120, when the second branch pipe 133 is communicated with the air outlet 122, a certain angle or a certain height is needed to be stably matched on the air outlet 122, for this reason, the second branch pipe 133 is divided into at least two sections in the present embodiment, so that the second branch pipe 133 can better act on the air outlet 122.

Further, referring to fig. 1, the second branch pipe 133 further includes a third pipe section 1333. The second pipe section 1332 is communicated with the first branch pipe 132 through a third pipe section 1333, and the third pipe section 1333 and the second pipe section 1332 form an included angle, at this time, the second branch pipe 133 is not a straight pipe structure, so that the channel in the second branch pipe 133 is a bent structure, and the problem that the system is easily damaged due to the fact that particles in the exhaust passage 120 are directly discharged into the secondary air supply system is effectively avoided.

In one embodiment, referring to FIG. 1, the first pipe segment 1331 is inclined on the exhaust passage 120 such that the secondary air flows into the exhaust passage 120 from the air outlet 122 at an angle, thereby facilitating the capture of the secondary air by the exhaust gas.

In one embodiment, referring to FIG. 1, the secondary air make-up device 100 further includes a first control valve 140. The first control valve 140 is installed on the exhaust passage 120. The first control valve 140 is used to control the opening and closing between the combustion chamber 110 and the exhaust passage 120, so that the amount of exhaust gas discharged is effectively controlled by the first control valve 140.

Further, referring to fig. 1, the air outlet 122 is located on a side of the first control valve 140 away from the combustion chamber 110, that is, the air outlet 122 is located on an exhaust side of the first control valve 140.

In one embodiment, referring to FIG. 1, the secondary air make-up device 100 further includes an air inlet pipe 150 and a second control valve 160. The intake pipe 150 is configured to be mounted on the second heat dissipation structure 300 and is communicated with the combustion chamber 110. The second control valve 160 is installed on the intake pipe 150, and the second control valve 160 is used for controlling the on/off between the combustion chamber 110 and the intake pipe 150.

In one embodiment, please refer to fig. 7 and 8, an engine includes a first heat dissipation structure 200, a second heat dissipation structure 300 and the secondary air supply device 100 in any of the above embodiments. The second heat dissipation structure 300 is mounted on the first heat dissipation structure 200. The combustion chamber 110 and the exhaust passage 120 are disposed in the second heat dissipation structure 300. The air supply pipe 130 is disposed on the first heat dissipation structure 200. The air inlet 131 is located on the first heat dissipation structure 200. The end of the air supplement pipe 130 far away from the air inlet 131 is communicated with the air outlet 122.

In the engine, the secondary air supply device 100 utilizes the time nonuniformity of the pollutant content in the exhaust gas, that is, when the exhaust valve of the combustion chamber 110 is just opened and the exhaust valve is closed quickly, the emission of the pollutant content can generate a peak value, and the secondary air supply is performed in the exhaust passage 120 through the air supply pipe 130 in time, so that the air supply effect is improved. Meanwhile, when the exhaust valve is opened or closed, the valve lift is small, resulting in a small flow rate and a low flow velocity of the exhaust gas in the combustion chamber 110 entering the exhaust passage 120, and a large exhaust gas flow velocity gradient at each cross section in the exhaust passage 120, resulting in more exhaust gas flowing along the inner surface of the exhaust passage 120 farther from the combustion chamber 110, i.e., more exhaust gas flowing intensively on the upper inner surface of the exhaust passage 120 relative to the combustion chamber 110. Therefore, the air supply device 100 divides the inner surface of the exhaust passage 120 into: two upper and lower tube faces relative to combustion chamber 110 to set up gas outlet 122 on first tube face 123, make the secondary air who mends from air supplement pipe 130 can be caught by more waste gas fast, accelerate the oxidation reaction of pollutant in the waste gas, effectively reduce the emission of pollutant, consequently, no matter in time or in the space, all help in time to mend the secondary air through this air supplement unit 100, reduce the emission of pollutant in the waste gas. In addition, when a pressure peak occurs in the exhaust passage 120, the discharged exhaust gas may generate a reverse flow phenomenon, that is, the discharged exhaust gas is returned from the exhaust passage 120 to the combustion chamber 110, and at this time, the exhaust gas flow velocity gradient is large and more exhaust gas is concentrated on the second tube surface 124 to flow. Because the air outlet 122 is arranged on the first pipe surface 123, the backflow waste gas rarely enters the air supplementing pipe 130, so that the backflow quantity of the waste gas entering the secondary air supplementing system from the exhaust passage 120 is effectively reduced, and the risk of blocking the secondary air supplementing system is effectively avoided. In addition, the air inlet 131 of the air supplement device 100 is located on the side of the air outlet 122 facing the second tube surface 124, so that the air supplement tube 130 has sufficient operating space for installation on the engine, and the overall installation of the secondary air supplement device 100 is more convenient.

It should be noted that the first heat dissipation structure 200 and the second heat dissipation structure 300 are both fin heat dissipation structures, and since the first heat dissipation structure 200 and the second heat dissipation structure 300 are not the improved objects of the present embodiment, the specific structures thereof are not described in detail, and reference can be directly made to the existing products and the existing documents.

Further, a gasket 400 is disposed between the first heat dissipation structure 200 and the second heat dissipation structure 300, so as to improve the overall air tightness of the engine.

The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

Claims (10)

1. A secondary air supplement unit, comprising:

a combustion chamber;

the exhaust passage is arranged on the combustion chamber and communicated with the combustion chamber, a surface passing through the central line of the exhaust passage is used as a cutting surface, the inner surface of the exhaust passage is divided into a first pipe surface and a second pipe surface which are oppositely arranged, the first pipe surface is far away from the combustion chamber relative to the second pipe surface, and a gas outlet is arranged on the first pipe surface; and

the air supplementing pipe is arranged on the exhaust passage and is communicated with the exhaust passage through the air outlet, one port of the air supplementing pipe, which is far away from the exhaust passage, is an air inlet, and the air inlet is positioned on one side, facing the second pipe surface, of the air outlet.

2. The secondary air supplement device of claim 1, wherein the exhaust passage is curved in a direction that is biased toward the combustion chamber, a centerline of the exhaust passage is curved to form a plane of inflection, the intercept plane is perpendicular to the plane of inflection, and the intercept plane divides the inner surface of the exhaust passage into the first tube face and the second tube face.

3. The secondary air supplement device of claim 1, wherein the combustion chamber has a cylinder axis, and the position of the air inlet port relative to the first tube surface is lower than the position of the air outlet port on the first tube surface in the direction of the cylinder axis.

4. The secondary air supply device of claim 1, wherein the air supply duct includes a first branch duct and a second branch duct, one end of the first branch duct communicates with the second branch duct, the other end of the first branch duct is the air inlet, and the second branch duct is installed on the exhaust duct and communicates with the inside of the exhaust duct through the air outlet.

5. The secondary air make-up device according to claim 4, wherein the second branch pipe comprises a first pipe section and a second pipe section, the first pipe section is used for being mounted on the second heat dissipation structure and communicated with the inside of the exhaust passage through the air outlet, one end of the second pipe section is communicated with the first pipe section, and the other end of the second pipe section is communicated with the first branch pipe.

6. The secondary air make-up device of claim 5, wherein the second manifold further comprises a third tube segment, the second tube segment being in communication with the first manifold via the third tube segment, and the third tube segment being disposed at an angle to the second tube segment.

7. The secondary air make-up device of claim 5, wherein the first pipe section is angled on the exhaust passage.

8. The secondary air supplement device of any one of claims 1-7, further comprising a first control valve disposed on the exhaust passage, the first control valve configured to control the connection/disconnection between the combustion chamber and the exhaust passage.

9. The secondary air supplement device according to any one of claims 1 to 7, further comprising an air inlet pipe and a second control valve, wherein the air inlet pipe is used for being mounted on a second heat dissipation structure and communicated with the combustion chamber, the second control valve is mounted on the air inlet pipe, and the second control valve is used for controlling the on-off between the combustion chamber and the air inlet pipe.

10. An engine, comprising a first heat dissipation structure, a second heat dissipation structure and the secondary air supply device as claimed in any one of claims 1 to 9, wherein the second heat dissipation structure is mounted on the first heat dissipation structure, the combustion chamber and the exhaust passage are both mounted in the second heat dissipation structure, the air supply pipe is mounted on the first heat dissipation structure, the air inlet is located on the first heat dissipation structure, and one end of the air supply pipe, far away from the air inlet, is communicated with the air outlet.

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