EGR (exhaust gas recirculation) route engine energy conservation and emission reduction control device

Abstract

The EGR route engine energy conservation and emission reduction control device comprises an EGR cooler and a flow control assembly composed of a straight channel, an arc channel and an inclined channel, a flat straight channel and a protruding channel are formed between the straight channel and the inclined channel through a forked baffle, and the curved surface part of the protruding channel is connected with the straight channel at an acute angle. During forward flowing, waste gas enters the intake manifold through the flat straight flow channel with low resistance, during backward flowing, airflow is guided to the arc-shaped protruding flow channel, pressure drop is increased through vortex and path extension, backward flowing is effectively restrained, and the device is provided with the copper hollow heat dissipation fins and has the heat dissipation function and the flow dividing resistance function; multi-stage flow control assemblies are connected in series, the size of an air inlet is gradually increased, transition is achieved through a conical connecting pipe, forward flow channels are optimized to be gradually expanded so as to reduce turbulence, and meanwhile reverse resistance is overlaid. According to the design, a mechanical valve is not needed, one-way control is achieved through the geometric asymmetric flow channel, the pumping loss is reduced, the carbon deposition risk is reduced, and the stability and emission control efficiency of the EGR system are remarkably improved.

Description

Technical Field

[0001] The present invention relates to the technical field of engines with an EGR route, and specifically to an energy-saving and emission-reduction control device for an engine with an EGR route. Background Art

[0002] The EGR (Exhaust Gas Recirculation) route reduces the oxygen concentration and combustion temperature by reintroducing part of the engine exhaust gas into the combustion chamber and mixing it with fresh air, thereby suppressing the generation of nitrogen oxides (NOx). The process is as follows: After the exhaust gas is cooled by the EGR cooler on the exhaust side, it enters the intake manifold through a pipeline, mixes with air, and participates in combustion to achieve the purpose of emission reduction.

[0003] In the prior art, high-pressure EGR relies on high-pressure exhaust gas before the turbine, resulting in a decrease in turbine efficiency and high costs; mechanical valves are prone to particulate wear due to movable parts, require frequent maintenance, and have low reliability. In addition, the traditional system is sensitive to the pressure difference between the upstream and downstream of EGR. When the pressure difference is insufficient, the EGR rate is unstable, which is likely to cause exhaust gas backflow, leading to performance deterioration. At the same time, the flow channel structure is roughly designed and prone to carbon deposition, and the cooler load is large, making it difficult to meet the requirements of strict emission regulations.

[0004] Therefore, we propose an energy-saving and emission-reduction control device for an engine with an EGR route. Summary of the Invention

[0005] The purpose of the present invention is to provide an energy-saving and emission-reduction control device for an engine with an EGR route to solve the above-mentioned deficiencies in the prior art.

[0006] To achieve the above purpose, the present invention provides the following technical solutions: including an EGR cooler and an exhaust side provided on the EGR cooler, the energy-saving and emission-reduction control device for the engine with an EGR route further includes:

[0007] A straight channel, an arc channel, and an inclined channel that are sequentially fixedly arranged with each other and form a flow control assembly, and cavities for the exhaust gas to pass through are formed inside the straight channel, the arc channel, and the inclined channel. There is an included angle between the straight channel and the inclined channel, and a bifurcation baffle is provided at the position of the cavity close to the arc channel; the bifurcation baffle forms a straight flow channel below the position of the arc channel and a raised flow channel above the arc channel. The straight channel is connected to the exhaust side through an air inlet;

[0008] The raised flow channel is divided into a straight part and a curved part. Among them, the straight part is connected to the inclined channel, and the curved part is connected to the straight channel and the included angle at the interface position with the exhaust gas flow direction is an acute angle.

[0009] As a further description of the above technical solution: Hollow heat dissipation fins are also provided on the straight channel. The hollow heat dissipation fins are communicated with the cavity at the position of the straight channel, and the hollow heat dissipation fins are arranged parallel to the inclined channel.

[0010] As a further description of the above technical solution: a backing plate is provided on the cavity surface close to the straight channel, and an arc-shaped baffle is provided at the cavity position close to the bifurcated baffle. The radian of the arc-shaped baffle is the same as that of the arc channel bifurcated baffle, and there is a gap between the arc-shaped baffle and the bifurcated baffle.

[0011] As a further description of the above technical solution: the size of the straight flow channel between the arc-shaped baffle and the backing plate is the same as that of the cavity at the straight channel position, and is smaller than the size of the cavity at the inclined channel position.

[0012] As a further description of the above technical solution: the hollow heat dissipation fins are made of copper.

[0013] As a further description of the above technical solution: the ends of the arc-shaped baffle and the backing plate extend to the connection positions of the arc channel, the straight channel and the inclined channel, and an end face is formed on the side close to the inclined channel.

[0014] As a further description of the above technical solution: multiple sets of flow control components formed by the straight channel, the arc channel and the inclined channel are arranged in series, and the air inlets and the inclined channels in adjacent flow control components are connected.

[0015] As a further description of the above technical solution: the sizes of the air inlets in adjacent flow control components along the exhaust gas flow direction gradually increase.

[0016] As a further description of the above technical solution: the included angle at the connection position of the straight channel and the inclined channel in adjacent two flow control components along the exhaust gas flow direction gradually increases.

[0017] As a further description of the above technical solution: a conical connecting piece is provided between the inclined channels and the air inlets of adjacent two flow control components.

[0018] In the above technical solution, an EGR route engine energy conservation and emission reduction control device provided by the present invention has the following beneficial effects:

[0019] 1. Through the combination of the straight channel, the arc channel and the inclined channel, the resistance is reduced during forward flow, and when reverse backflow occurs, the arc path of the raised flow channel and the bifurcated baffle are used to induce eddy currents, significantly increasing the reverse pressure drop, blocking the reverse flow of exhaust gas, and the copper hollow heat dissipation fins are connected to the straight channel, accelerating the cooling of exhaust gas during forward flow, and when reverse backflow occurs, part of the air flow is diverted to the narrow fin channels, superimposing the resistance and reducing the load of the EGR cooler.

[0020] 2. Multiple flow control components are arranged in series, with the intake port size gradually increasing step by step and transitioning through a conical connecting pipe. This smoothly expands the flow in the forward direction to reduce turbulence, and in the reverse direction, multiple-stage pressure drops are superimposed. The flow direction is completely controlled by the geometric flow path, avoiding mechanical wear, extending the service life, and reducing maintenance costs.

[0021] 3. The counterflow effect suppresses backflow: The included angle between the straight channel and the inclined channel of adjacent components gradually increases. After the reverse airflow bypasses and collides with the forward airflow, the energy dissipation is intensified, further enhancing the anti-backflow ability. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] To more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings.

[0023] Figure 1 It is a schematic diagram of the overall structure provided by an embodiment of the present invention;

[0024] Figure 2 It is a schematic diagram of the structure of the flow control component provided by an embodiment of the present invention;

[0025] Figure 3 It is a schematic diagram of the cross-sectional structure of the flow control component provided by an embodiment of the present invention;

[0026] Figure 4 It is a schematic diagram of the structure of the backing plate and the arc-shaped baffle provided by an embodiment of the present invention.

[0027] Description of the reference numerals in the drawings:

[0028] 1. EGR cooler; 2. Exhaust side; 3. Intake port; 4. Straight channel; 5. Arc channel; 6. Hollow heat dissipation fins; 7. Inclined channel; 8. Cavity; 9. Fork baffle; 10. Backing plate; 11. Arc-shaped baffle. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0029] To enable those skilled in the art to better understand the technical solutions of the present invention, the following will further introduce the present invention in detail in conjunction with the drawings.

[0030] Please refer to Figures 1 - 4 , an embodiment of the present invention provides a technical solution: including an EGR cooler 1 and an exhaust side 2 provided on the EGR cooler 1. The EGR cooler 1 is used to cool the exhaust gas that needs to be recirculated, reduce the combustion temperature, thereby reducing nitrogen oxide (NOx) emissions and optimizing the engine performance;

[0031] In order to reduce the need for the EGR introduction to rely on the pre-high-vortex pressure, the EGR route engine energy conservation and emission reduction control device further includes: a straight channel 4, an arc channel 5, and an inclined channel 7 that are fixedly arranged in sequence and form a flow control assembly, and a cavity 8 for the exhaust gas to pass through is formed inside the straight channel 4, the arc channel 5, and the inclined channel 7. An angle is provided between the straight channel 4 and the inclined channel 7, and a bifurcated baffle 9 is arranged at the position of the cavity 8 close to the arc channel 5; the bifurcated baffle 9 forms a straight flow channel below the position of the arc channel 5 and a convex flow channel above the arc channel 5. The straight channel 4 is connected to the EGR cooler 1 through an air inlet 3, and the inclined channel 7 is connected to the intake manifold.

[0032] Here, the exhaust gas that needs to participate in combustion and is discharged from the EGR cooler 1 enters the intake manifold through the flow control assembly, mixes with fresh air, and then enters the combustion chamber, thereby reducing the oxygen content, inhibiting the chemical reaction between nitrogen and oxygen at high temperatures, and further reducing NOx emissions.

[0033] Please refer to Figure 3 and Figure 4 , when the exhaust gas is discharged from the EGR cooler 1 into the flow control assembly, it will first enter the straight channel 4 through the air inlet 3, and then pass through the cavity 8 in the flow control assembly, and flow in the direction of the straight channel 4, the straight flow channel below the arc channel 5, and the inclined channel 7, so as to transport the exhaust gas into the intake manifold. Here, there are two paths for the exhaust gas to enter the cavity 8 in the inclined channel 7 from the cavity 8 in the straight channel 4. The first path is the straight flow channel below the bifurcated baffle 9, and the other path is the convex flow channel at the convex position of the bifurcated baffle 9. And the convex flow channel is divided into a straight part and a curved part. Among them, the straight part is connected to the inclined channel 7, and the curved part is connected to the straight channel 4 and the included angle at the interface position with the exhaust gas flow direction is an acute angle. Therefore, when the exhaust gas is discharged from the EGR cooler 1 and transported along the direction towards the intake manifold, please refer to Figure 1 , the exhaust gas enters the straight channel 4 through the air inlet 3. Since the straight channel 4 is connected to the curved part of the convex flow channel at a certain angle (acute angle), the resistance is small. At this time, the exhaust gas flow will enter the inclined channel 7 along the straight flow channel, and thus be transported into the intake manifold to be mixed with air. Through flow channel optimization, the sensitivity to the upstream and downstream pressure differences of the EGR is reduced, and a stable EGR rate can still be maintained even when the pressure difference is low, solving the problem of relying on the high-pressure exhaust gas in front of the turbine, which leads to a negative impact on the efficiency of the turbocharger and high costs, and there is no need;

[0034] In contrast, when the gas pressure difference is negative and exhaust gas backflow is triggered, when the exhaust gas backflows and enters the inclined channel 7 reversely from the intake manifold, since the straight part of the convex flow channel is connected to the inclined channel 7, in this way, when the exhaust gas backflows, the exhaust gas is guided to a preset high-resistance path (i.e., the arc-shaped convex flow channel), preventing it from directly entering the low-resistance main channel. Since the convex flow channel is arc-shaped, when the backflow air enters the arc-shaped convex flow channel, due to the change in curvature, the air flow is forced to turn along the arc surface, forming a centrifugal effect, triggering flow separation, generating a local eddy current area, increasing the kinetic energy loss, thereby increasing the reverse pressure drop. And the arc-shaped convex flow channel increases the friction between the exhaust gas and the channel wall surface by extending the air flow path, further consuming the air flow energy and increasing the reverse flow pressure of the exhaust gas, thus preventing the reverse flow and backflow of the exhaust gas, and reducing the performance degradation problem caused by the intake backflow due to the negative pressure difference between the upstream and downstream of the EGR. Moreover, by optimizing the exhaust gas flow channel, when the exhaust gas flows forward (from the EGR cooler 1 to the intake manifold), the resistance is reduced, while when the exhaust gas backflows reversely (from the intake manifold to the EGR cooler 1), the gas flow resistance is increased. Without using a mechanical structure, different from the traditional EGR cooler 1 valve, this flow control component has no movable mechanical parts, greatly reducing the maintenance cost and the risk of performance degradation caused by mechanical wear and failure, and at the same time improving the reliability and service life of the valve;

[0035] And because no mechanical valve body is used and the straight channel 4, arc channel 5 and inclined channel 7 are designed, compared with the corners and edges of the mechanical valve body mechanism, the deposition of particulate matter is reduced, thereby reducing the risk of carbon deposition;

[0036] It should also be noted that in order to increase the cooling pressure of the EGR cooler 1 on the exhaust gas, hollow heat dissipation fins 6 are also provided. The hollow heat dissipation fins 6 are connected to the cavity 8 at the position of the straight channel 4, and the hollow heat dissipation fins 6 are arranged in parallel with the inclined channel 7, and the hollow heat dissipation fins 6 are made of copper. In this way, the copper hollow heat dissipation fins 6 can dissipate the heat of the exhaust gas entering the flow control component, reducing the cooling pressure of the EGR cooler 1 on the exhaust gas. When the air flow backflows, since the hollow heat dissipation fins 6 are arranged in parallel with the inclined channel 7 and are connected to the cavity 8 at the position of the straight channel 4, that is, connected to the straight flow channel. In this way, when the exhaust gas backflows, a part of the exhaust gas enters the convex flow channel in the arc channel 5, while the other part enters the hollow heat dissipation fins 6, generating an additional pressure drop and forming a parallel resistance path to further block the backflow. The provided hollow heat dissipation fins 6 not only have a heat dissipation effect but also can prevent the air flow from backflowing, giving the hollow heat dissipation fins 6 a special use effect;

[0037] In one embodiment of the present invention, a pad 10 is provided on the surface of the cavity 8 near the straight channel 4, and an arc baffle 11 is provided at the position of the cavity 8 near the bifurcated baffle 9. The curvature of the arc baffle 11 is the same as the curvature of the bifurcated baffle 9 of the circular arc channel 5, and there is a gap between the arc baffle 11 and the bifurcated baffle 9. The size of the flat flow channel between the arc baffle 11 and the pad 10 is the same as the size of the cavity 8 at the position of the straight channel 4, and is smaller than the size of the cavity 8 at the position of the oblique channel 7. When the exhaust gas flows forward, the exhaust gas enters the oblique channel 7 through the straight channel 4 and the flat flow channel between the arc baffle 11 and the pad 10, which is equivalent to entering a larger space from a relatively narrow space. The cross-sectional area of the flow channel suddenly expands and the flow velocity decreases. According to the Bernoulli principle, when the flow velocity decreases, the kinetic energy is partially converted into pressure energy, reducing the total pressure loss during the flow process, thereby reducing the pumping loss.

[0038] In addition, the combination of the expanded flow channel design and the guidance of the arc baffle 11 reduces the resistance and pumping loss during forward flow. At the same time, due to the asymmetric structure, the airflow is forced to enter the high resistance path (the raised flow channel and the hollow heat sink fin 6) during reverse flow due to the gap between the bifurcated baffle 9 and the arc baffle 11, thereby achieving unidirectional flow control and naturally suppressing reverse backflow.

[0039] In order to further suppress the backflow of exhaust gas, the ends of the arc-shaped baffle plate 11 and the pad plate 10 extend to the intersection of the arc-shaped channel and the straight channel 4 and the oblique channel 7, and an end face is formed near the oblique channel 7. When the exhaust gas flows back, the end face acts as a physical barrier to force the airflow into a preset high-resistance path to prevent it from escaping directly through the low-resistance area. The sharp edge of the end face causes flow separation during reverse flow, forming a local vortex area, which greatly increases the kinetic energy loss.

[0040] If a single flow control component consisting of a straight channel 4, an arc channel 5 and an oblique channel 7 cannot effectively suppress the problem of exhaust gas backflow, the flow control component formed by the straight channel 4, the arc channel 5 and the oblique channel 7 on the EGR route engine energy saving and emission reduction control device is provided with multiple groups in series, and the air inlet 3 and the oblique channel 7 in the adjacent flow control components are connected, each flow control component generates an independent pressure drop for the reverse airflow, and the total pressure drop increases exponentially after multiple stages are connected in series, thereby further improving the suppression effect on the exhaust gas flowing in the reverse direction;

[0041] And it should be noted here that the size of the air inlet 3 in the adjacent flow control components along the exhaust gas flow direction gradually increases. Since when installing multiple flow control components, the installation method is to connect the inclined channel 7 of the previous one of the adjacent two flow control components to the air inlet 3 of the latter flow control component, and the size of the air inlet 3 of each flow control component gradually increases, and a conical connecting pipe is provided between the inclined channel 7 and the air inlet 3 of the adjacent two flow control components;

[0042] When connecting multiple levels of flow control components in series along the positive exhaust gas flow direction, by gradually increasing the size of the air inlet 3 of adjacent components and using a conical connecting pipe for transition, smooth gradual expansion of the flow channel during forward flow can be achieved, reducing turbulence and energy loss caused by sudden changes in cross-sectional area, significantly reducing pumping losses and improving fuel economy; at the same time, when the reverse backflow air flow gradually enters the flow channels with increasing sizes, due to the conical connecting pipe guiding the backflow air flow into the inclined channel 7 of the adjacent and narrower flow control component, the pressure drop is increased, and the multiple flow control components are connected in series to superimpose the pressure drop, forcing the exhaust gas to successively experience multiple high-resistance paths, forming a stepped energy dissipation, thereby greatly enhancing the anti-backflow ability. In addition, the conical connecting pipe and the size gradient design cooperate to optimize the uniformity of the air flow distribution, avoid the risk of local hot spots or carbon deposition, enhance the reliability of the system and the adaptability to all working conditions, and finally achieve efficient energy saving and emission reduction while simplifying the control logic;

[0043] And the included angle between the straight channel 4 and the position where the convex flow channel curved surface part is connected in the adjacent two flow control components along the exhaust gas flow direction gradually increases. In this way, during forward flow, turbulence and energy loss can be reduced through gentle flow channel turning, and the mixing uniformity of the exhaust gas and fresh air can be optimized; during reverse backflow, the larger included angle forces the exhaust gas to travel a longer arc path in the flow channel, forming local eddies and inducing some air flow to collide with the forward exhaust gas at the entrance of the straight channel 4. This collision effect not only directly consumes the kinetic energy of the backflow air flow, but also further intensifies the energy dissipation through collision disturbance.

[0044] Only some exemplary embodiments of the present invention have been described by way of illustration above. Undoubtedly, for those of ordinary skill in the art, without departing from the spirit and scope of the present invention, the described embodiments can be modified in various different ways. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the protection scope of the claims of the present invention.

Claims

1. An EGR route engine energy conservation and emission reduction control device, including an EGR cooler (1) and an exhaust side (2) provided on the EGR cooler (1), characterized in that, The EGR route engine energy saving and emission reduction control device also includes: A straight channel (4), a circular arc channel (5) and an oblique channel (7) are fixedly arranged in sequence to form a flow control component, and a cavity (8) is formed inside the straight channel (4), the circular arc channel (5) and the oblique channel (7) for exhaust gas to pass through, an angle is formed between the straight channel (4) and the oblique channel (7), and a bifurcated baffle (9) is arranged in the cavity (8) near the circular arc channel (5); the bifurcated baffle (9) forms a flat straight channel below the circular arc channel (5) and a convex flow channel above the circular arc channel (5), and the straight channel (4) is connected to the exhaust side (2) through an air inlet (3); The raised flow channel is divided into a straight portion and a curved portion, wherein the straight portion is connected to the inclined channel (7), and the curved portion is connected to the straight channel (4), and the angle between the interface position and the exhaust gas flow direction is an acute angle.

2. The energy-saving and emission-reduction control device for an EGR route engine according to claim 1, characterized in that, The straight channel (4) is also provided with a hollow heat dissipation fin (6), the hollow heat dissipation fin (6) is connected to the position cavity (8) of the straight channel (4), and the hollow heat dissipation fin (6) is arranged in parallel with the inclined channel (7).

3. An EGR route engine energy conservation and emission reduction control device according to claim 2, characterized in that A pad (10) is provided on the surface of the cavity (8) close to the straight channel (4), and an arc-shaped baffle (11) is provided at a position of the cavity (8) close to the bifurcated baffle (9). The arc of the arc-shaped baffle (11) is the same as the arc of the bifurcated baffle (9) of the circular arc channel (5), and a gap is provided between the arc-shaped baffle (11) and the bifurcated baffle (9).

4. An EGR route engine energy conservation and emission reduction control device according to claim 3, characterized in that, The size of the straight straight channel between the arc-shaped baffle plate (11) and the pad plate (10) is the same as the size of the cavity (8) at the position of the straight channel (4), and is smaller than the size of the cavity (8) at the position of the inclined channel (7).

5. An EGR route engine energy conservation and emission reduction control device according to claim 4, characterized in that, The hollow heat dissipation fins (6) are made of copper.

6. The EGR route engine energy conservation and emission reduction control device according to claim 5, characterized in that, The ends of the arc-shaped baffle plate (11) and the pad plate (10) extend to the intersection of the arc-shaped channel and the straight channel (4) and the inclined channel (7), and an end surface is formed close to the inclined channel (7).

7. An EGR route engine energy conservation and emission reduction control device according to claim 1, characterized in that, A plurality of flow control components formed by the straight channel (4), the arc channel (5) and the oblique channel (7) are arranged in series, and the air inlets (3) and the oblique channels (7) in adjacent flow control components are connected.

8. An EGR route engine energy conservation and emission reduction control device according to claim 4, characterized in that, The sizes of the air inlets (3) in the adjacent flow control components along the exhaust gas flow direction gradually increase.

9. The energy-saving and emission-reduction control device for an EGR route engine according to claim 1, wherein, The angle between the connecting positions of the straight channel (4) and the oblique channel (7) in two adjacent flow control components along the exhaust gas flow direction gradually increases.

10. The EGR route engine energy conservation and emission reduction control device according to claim 1, characterized in that, A conical connecting pipe is provided between the oblique channels (7) and the air inlet (3) of two adjacent flow control components.

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