CN210660358U - EGR system of engine - Google Patents

Abstract

The utility model discloses an EGR system of an engine, which comprises a gas taking pipeline, wherein the gas taking pipeline is communicated with an exhaust pipeline of the engine; still include with adjusting device that exhaust pipe connects, adjusting device includes drive assembly and separates and keep off the part, it is close to separate to keep off the part the gas vent setting of exhaust pipe, drive assembly is used for the drive it adjusts the warp to separate to keep off the action of part the displacement that the gas vent flows. The structure of the EGR system can adjust the exhaust volume entering the supercharger, thereby adjusting the gas taking capacity of the EGR, reasonably distributing the exhaust volume, reducing the exhaust loss and simultaneously improving the control precision of the EGR rate.

Description

EGR system of engine

Technical Field

The utility model relates to the technical field of engines, especially, relate to an EGR system of engine.

Background

With the stricter and stricter engine emission regulations, EGR technology is becoming one of the technologies commonly used in engines at present.

In many EGR systems of engines, exhaust gas is taken from the front of an engine supercharger, and is introduced into an engine intake pipe through an EGR cooler, an EGR valve and other components to be mixed with fresh intake air. EGR rate is the ratio of the amount of exhaust gas recirculated to the total amount of intake air, and accurate control of ERG rate directly affects engine performance and pollutant emissions.

At present, the regulation of the ERG rate can only be realized by regulating the opening degree of an EGR valve, and after the EGR gas taking position, the pipe diameter, the gas taking angle and the like are determined, the maximum value of the EGR rate is determined and cannot be changed.

Specifically, in a large torque area of the engine, the design requires the maximum EGR rate to meet the emission requirement, but the design can cause the surplus air intake of the EGR system at the rated point (in a very common working condition area), and in order to ensure that the smoke intensity of the engine does not exceed the limit value, only the EGR opening degree can be reduced to improve the excess air coefficient, and the mode can cause the EGR pipeline to generate large throttling loss, so that the utilization rate of the exhaust energy is reduced. Meanwhile, the smaller opening degree of the EGR valve can reduce the control precision of the EGR rate and increase the risk of exceeding the standard of pollutant emission of the engine.

In view of the above, how to improve the existing EGR system to achieve variable adjustment of the gas extraction capacity of the EGR system while ensuring accurate control of the EGR rate is a technical problem that needs to be solved by those skilled in the art at present.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a EGR system of engine, the displacement that gets into the booster can be adjusted in this EGR system's structure setting to can adjust EGR get gas ability, can the rational distribution displacement, reduce the loss of exhaust, improve the control accuracy of EGR rate simultaneously.

In order to solve the technical problem, the utility model provides an EGR system of an engine, which comprises a gas taking pipeline, wherein the gas taking pipeline is communicated with an exhaust pipeline of the engine; still include with adjusting device that exhaust pipe connects, adjusting device includes drive assembly and separates and keep off the part, it is close to separate to keep off the part the gas vent setting of exhaust pipe, drive assembly is used for the drive it adjusts the warp to separate to keep off the action of part the displacement that the gas vent flows.

The utility model provides a EGR system of engine is provided with adjusting device on the blast pipe way, this adjusting device is equipped with and separates the fender part, separate the gas vent setting that the fender part is close to the exhaust pipe, can control through the driver part and separate the exhaust volume that the fender part moved in order to adjust the outflow gas vent to can adjust EGR and get gas ability, so, can separate the action that keeps off the part according to the different operating mode control of engine, with rational distribution exhaust energy, reduce the loss of exhaust, improve the control accuracy of EGR rate simultaneously.

The EGR system comprises a cylinder body and a telescopic component, wherein the telescopic component comprises a piston head matched with an inner cavity of the cylinder body and a baffle plate connected with the piston head, the piston head divides the inner cavity of the cylinder body into a first chamber and a second chamber, and the baffle plate is positioned in the second chamber and penetrates through the end wall of the cylinder body to extend into the exhaust pipeline; the driving component is used for driving the telescopic component to stretch and retract so as to adjust the length of the baffle plate extending into the exhaust pipeline.

The EGR system as described above, the driving means comprising an oil source and a control valve communicating with the first chamber through an oil pipe, the control valve being switchable between two operating positions: and the first cavity is communicated with the oil source through the oil pipe, and is positioned at the second working position, and the first cavity is communicated with the oil return pipeline through the oil pipe.

In the EGR system, the oil source is an engine oil tank of the engine, the control valve has three oil ports, a first oil port is connected to the engine oil tank through an engine oil pump, a second oil port is connected to the oil return pipeline, and a third oil port is connected to the oil pipe; the valve core of the control valve is located at the first working position, the valve core blocks the second oil port, the first oil port is communicated with the third oil port through the valve cavity of the control valve, the valve core is located at the second working position, the valve core blocks the first oil port, and the second oil port is communicated with the third oil port through the valve cavity.

In the EGR system, the control valve is an electromagnetic valve, and comprises a valve body and the valve core arranged in the valve body, wherein an electromagnetic valve seat is arranged at one end of the valve body, and a reset elastic element is arranged between the electromagnetic valve seat and the valve core.

In the EGR system as described above, the driving part further includes an elastic element located in the second chamber, and both ends of the elastic element respectively abut against the end wall of the cylinder and the piston head.

In the EGR system, two elastic elements are provided and are respectively disposed on two sides of the baffle plate.

According to the EGR system, the exhaust pipeline comprises an exhaust main pipe and four exhaust branch pipes arranged along the length direction of the exhaust main pipe, and the four exhaust branch pipes are communicated with the exhaust main pipe; the exhaust pipeline further comprises a transition pipe connected with the exhaust port; the connecting position of the transition pipe and the exhaust main pipe is positioned in the middle of the exhaust main pipe, and two exhaust branch pipes are respectively arranged on two sides of the connecting position of the transition pipe and the exhaust main pipe; the baffle plate extends into the middle position of the exhaust main pipe.

In the EGR system, the gas intake pipe is connected to the exhaust manifold and is disposed near one of the exhaust branch pipes connected to one end of the exhaust manifold.

According to the EGR system, the cylinder body comprises a cylinder body, and a first end cover and a second end cover which are located at two ends of the cylinder body, wherein the first end cover and the second end cover are respectively connected with two ends of the cylinder body in a sealing manner, the second end cover is fixedly connected with the exhaust pipeline, and the baffle plate penetrates through the second end cover and extends into the exhaust pipeline.

Drawings

FIG. 1 is a schematic view of an exemplary embodiment of an adjusting device for an EGR system of an engine according to the present invention assembled with an exhaust line;

FIG. 2 is a schematic view of an alternative angle of the mounting arrangement of the regulating device of FIG. 1 to the exhaust line;

FIG. 3 is a schematic angular cross-sectional view of the regulator assembly of FIG. 1 in an assembled configuration with an exhaust line;

FIG. 4 is a schematic cross-sectional view of another angle of the mounting arrangement of the regulating device of FIG. 1 to the exhaust line;

FIG. 5 is a schematic view of the adjustment device of FIG. 1;

FIG. 6 is a schematic partial cross-sectional view of the adjustment device of FIG. 5;

FIG. 7 is a schematic cross-sectional view of an embodiment of an adjustment device in a first operating position;

fig. 8 is a schematic cross-sectional view of the adjustment device in a second operating position according to an embodiment.

Description of reference numerals:

the exhaust pipeline 100, the exhaust manifold 110, the first exhaust branch pipe 121, the second exhaust branch pipe 122, the third exhaust branch pipe 123, the fourth exhaust branch pipe 124, the transition pipe 130 and the gas taking port 140;

the adjusting device 200, the cylinder 210, the cylinder body 211, the second end cap 212, the first end cap 213, the first chamber 214, the second chamber 215, the telescopic member 220, the piston head 221, the baffle 222, the elastic element 230, the solenoid valve 240, the valve body 241, the valve core 242, the solenoid valve seat 243, the return elastic element 244, the first oil port a, the second oil port B, the third oil port C, and the oil pipe 250.

Detailed Description

In order to make the technical field better understand the solution of the present invention, the following detailed description of the present invention is provided with reference to the accompanying drawings and the detailed description.

Referring to fig. 1 to 4, fig. 1 is a schematic view illustrating an assembly structure of an exhaust pipe and a regulating device of an engine EGR system according to an embodiment of the present invention; FIG. 2 is a schematic view of an alternative angle of the mounting arrangement of the regulating device of FIG. 1 to the exhaust line; FIG. 3 is a schematic angular cross-sectional view of the regulator assembly of FIG. 1 in an assembled configuration with an exhaust line; fig. 4 is a schematic cross-sectional view of another angle of the assembly structure of the regulating device and the exhaust line shown in fig. 1.

The EGR system of the engine comprises components such as an EGR valve and an EGR cooler, and the connection relationship of the components can be referred to the prior art and is not detailed; the EGR system provided in this embodiment is additionally provided with the adjusting device 200 based on the existing structure, and the following description focuses on the specific structure of the adjusting device 200 and the connection relationship with the exhaust line 100 of the engine.

In this embodiment, the gas intake line of the EGR system is connected to the exhaust line 100, so that part of the exhaust gas in the exhaust line 100 can enter the intake line of the engine through the gas intake line; the exhaust port of the exhaust line 100 communicates with an associated component of the exhaust system, such as a supercharger (hereinafter illustrated as the exhaust port communicating directly with the supercharger).

In this embodiment, the adjusting device 200 comprises a driving component and a blocking component, wherein the blocking component is arranged near the exhaust port of the exhaust pipeline 100, and the driving component can drive the blocking component to act so as to adjust the amount of exhaust gas flowing in and out through the exhaust port.

The exhaust volume of the exhaust pipeline 100 flowing out through the exhaust port is adjusted through the adjusting device 200, exhaust in the exhaust pipeline 100 is divided into two paths, one path of exhaust is exhausted through the exhaust port, the other path of exhaust flows back to the air inlet pipe through the air intake pipeline of the EGR system, the exhaust volume flowing out through the exhaust port is adjustable, and accordingly the air intake capacity of the EGR system is adjustable.

Referring to fig. 5 and 6 together, fig. 5 is a schematic structural diagram of the adjusting device shown in fig. 1; fig. 6 is a schematic partial cross-sectional view of the adjustment device of fig. 5.

In a specific scheme, the barrier component of the adjusting device 200 comprises a cylinder 210 and a telescopic component 220, wherein the telescopic component 220 comprises a piston head 221 and a barrier 222 connected with the piston head 221, the piston head 221 is adapted to the cross section of an inner cavity of the cylinder 210 to divide the inner cavity of the cylinder 210 into a first chamber 214 and a second chamber 215, the barrier 222 connected with the piston head 221 is located on one side of the second chamber 215 and extends into the exhaust pipe 100 after penetrating through one end wall of the cylinder 210, and the driving component can drive the telescopic component 220 to extend and retract along the axial direction of the cylinder 210 to adjust the length of the barrier 222 extending into the exhaust pipe 100.

It is understood that the baffle 222 is disposed near the exhaust port of the exhaust duct 100, and in order to adjust the amount of exhaust gas flowing out of the exhaust port, the relative position of the baffle 222 in the exhaust duct 100 may be adjusted by adjusting the flow area of the portion of the exhaust duct 100 communicating with the supercharger or by changing the flow resistance of the exhaust gas flowing to the exhaust port and the intake duct.

Specifically, in order to ensure the sealing performance between the first chamber 214 and the second chamber 215, a sealing ring may be disposed between the piston head 221 and the inner circumferential wall of the cylinder 210, and one or more sealing rings may be disposed, as required.

In addition to the above-described structure of the blocking member, the driving member may be a hydraulic structure, and the telescopic member 220 is driven by high-pressure oil to move in a telescopic manner with respect to the cylinder 210.

In particular, the driving means comprise an oil source and a control valve communicating with the first chamber 214 of the cylinder 210 through an oil duct 250, the control valve being able to switch between two work positions: in the first working position, the first chamber 214 is communicated with an oil source through an oil pipe 250, high-pressure oil enters the first chamber 214 of the cylinder 210 through the oil pipe 250 to push the telescopic component 220 to extend relative to the cylinder 210, namely, the baffle plate 222 of the telescopic component 220 moves towards the inside of the exhaust pipeline 100, so that the flow area of the part where the exhaust pipeline 100 is communicated with the supercharger is reduced, namely, the exhaust amount discharged into the supercharger is reduced; in the second working position, the first chamber 214 is connected to the oil return line through the oil pipe 250, so that the high-pressure oil in the first chamber 214 can flow back to the oil return line through the oil pipe 250.

In this embodiment, an elastic element 230 is disposed in the second chamber 215 of the cylinder 210, two ends of the elastic element 230 respectively contact with the end wall of the cylinder 210 and the piston head 221, and when the control valve is in the second working position, the elastic element 230 pushes the telescopic member 220 to retract relative to the cylinder 210 by a restoring force. Therefore, the arrangement of the hydraulic pipeline can be reduced, and the structure of the hydraulic pipeline is simplified. The elastic member 230 may be a spring.

In the concrete scheme, the engine oil of the engine can be selected for the oil source, so that the additional arrangement of the oil source can be avoided, and the structure is simplified.

Of course, in practical applications, both chambers of the cylinder 210 may be connected to an oil source through a pipeline, and the flow direction of the high pressure oil is changed by the arrangement of the related valve members to change the pressure applied to both ends of the telescopic member 220, thereby driving the telescopic member 220 to move telescopically relative to the cylinder 210. However, in contrast, the telescopic member 220 can be extended and contracted with respect to the cylinder block 210 by providing the elastic member 230 with the engine oil and by providing only one oil passage 250, and such a configuration is more compact and preferable.

In a specific scheme, the cylinder block 210 includes a cylinder body 211 having a cylindrical structure, a first end cap 213 and a second end cap 212 for sealing openings at two ends of the cylinder body 211, wherein the cylinder block 210 is connected to the exhaust pipe 100 through the second end cap 212, specifically, the second end cap 212 may be configured to be a flange structure, the exhaust pipe 100 is provided with a corresponding flange structure, and the two are fixedly connected through fasteners such as bolts. Of course, other fastening means may be used.

It is apparent that the baffle 222 of the telescoping member 220 extends through the second end cap 212 into the interior of the exhaust duct 100.

Specifically, the second end cap 212 and the cylinder body 211 may be integrally formed, the first end cap 213 and the cylinder body 211 may be detachably connected to facilitate assembly of the telescopic member and the cylinder body 210, and the first end cap 213 may be connected to the cylinder body 211 by a screw, and a sealing structure such as a sealing gasket may be disposed therebetween to ensure sealability of the cylinder body 210.

Referring to fig. 7 and 8 together, fig. 7 is a schematic cross-sectional view of an embodiment of an adjusting device in a first working position; fig. 8 is a schematic cross-sectional view of the adjustment device in a second operating position according to an embodiment.

In a specific scheme, the control valve may select the electromagnetic valve 240, the electromagnetic valve 240 includes a valve body 241 and a valve core 242 disposed in the valve body 241, three oil ports are opened on the valve body 241, wherein a first oil port a is connected to an oil tank of an engine through an oil pump, a second oil port B is connected to an oil return line, a third oil port C is connected to the first chamber 214 of the cylinder block 210 through an oil pipe 250, and the valve core 242 can move between two working positions to block the first oil port a, so that the second oil port B is communicated with the third oil port C, as shown in fig. 8, or the second oil port B is blocked, so that the first oil port a is communicated with the third oil port C, as shown in fig. 7.

Specifically, an electromagnetic valve seat 243 is installed at the upper end of the valve body 241, a return elastic member 244 is disposed between the electromagnetic valve seat 242 and the valve core 242, when the electromagnetic valve 240 is in a power-on state, the electromagnetic valve seat 242 generates electromagnetic force, the valve core 242 moves towards the electromagnetic valve seat 242 under the action of the electromagnetic force to block the second oil port B, in the process, the return elastic member 244 is compressed, when the electromagnetic valve 240 is in a power-off state, the electromagnetic force of the electromagnetic valve seat 242 disappears, and when the return elastic member 244 returns, the valve core 242 moves away from the electromagnetic valve seat 243 to block the first oil port a.

It should be noted that the above-mentioned plugging of the first oil port a or the second oil port B means that the communication between the first oil port a or the second oil port B and the third oil port C is cut off at the corresponding working position, as long as the function can be realized.

The connection of the oil pipe 250 to the cylinder 210 or the solenoid valve 240 may be in the form of an upset head and nut fit.

As shown in fig. 3, in this example, the top of the valve body 241 is an open structure to facilitate the assembly of the valve core 242 and the valve body 241, the solenoid valve 240 further includes a cover plate for closing the open top of the valve body 241, the solenoid valve seat 242 is specifically mounted on the cover plate, and two ends of the return elastic element 244 are respectively abutted to the valve core 242 and the cover body. The return elastic member 244 may be a spring structure, and in order to limit the relative position of the spring, a boss may be disposed at a corresponding position of the valve core 242 and the cover body, so that the spring is sleeved on the boss.

In the illustrated scheme, taking an engine as an example of four cylinders, the exhaust pipeline 100 includes an exhaust main pipe 110 and four exhaust branch pipes arranged along a length direction of the exhaust main pipe 110, the four exhaust branch pipes are respectively matched with four cylinders correspondingly, and in an exhaust stroke stage of each cylinder, exhaust gas flows into the exhaust main pipe 110 through the corresponding exhaust branch pipe and is then exhausted.

For convenience of description, the four exhaust branch pipes are referred to as a first exhaust branch pipe 121, a second exhaust branch pipe 122, a third exhaust branch pipe 123 and a fourth exhaust branch pipe 124 in sequence along the length direction of the exhaust manifold 110.

It is understood that the four exhaust branch pipes are located on one side of the exhaust manifold 110, specifically, the other side of the exhaust manifold 110 is provided with an exhaust port to exhaust the exhaust gas of the engine through the exhaust port, and specifically, the exhaust port may be connected with other components of the exhaust system, such as a supercharger, directly.

The exhaust circuit 100 also includes a transition duct 130 coupled to the exhaust port for connection to other components of the exhaust system (e.g., a supercharger) via the transition duct 130.

In a specific embodiment, the exhaust port is disposed near the middle of the exhaust duct 100, and is generally limited to the arrangement space of the engine, and the transition pipe 130 is a bent pipe structure; the gas intake 140 of the EGR system is arranged close to the fourth exhaust branch 124, in particular between the third exhaust branch 123 and the fourth exhaust branch 124.

Specifically, the cylinder 210 is fixedly connected to the exhaust manifold 110, and is disposed near the middle of the exhaust manifold 110, so that the baffle 222 of the telescopic member 220 is disposed near the exhaust port after passing through the exhaust manifold 110.

It will be appreciated that the cylinder block 210 is on the same side of the exhaust manifold 110 as the exhaust manifold, such that the telescoping movement of the baffle 222 changes the flow area of the exhaust manifold through the exhaust port to the transition duct 130.

As shown in fig. 3, the baffle plate 222 is a rectangular plate structure and is substantially perpendicular to the cross section of the exhaust manifold 110, but in practice, the baffle plate 222 may have other structures as long as the amount of exhaust gas flowing into the transition pipe 130 can be changed by the telescopic arrangement of the baffle plate with respect to the exhaust manifold 110.

On this basis, the two elastic elements 230 disposed in the second chamber 215 of the cylinder 210 may be disposed on two sides of the baffle 222, respectively, to provide a uniform restoring force to the telescopic member 220.

Specifically, to limit the installation position of the elastic member 230, a limit boss structure may be provided at a corresponding position of the end wall (i.e., the second end cover 212) of the cylinder 210 and a corresponding position of the piston head 221.

Taking the cylinder exhaust corresponding to the first exhaust branch pipe 121 as an example, the exhaust gas enters the exhaust main pipe 110 after being exhausted through the first exhaust branch pipe 121, and is divided into two paths, one path flows to the transition pipe 130 through the exhaust port, and the other path flows to the gas intake port 140 close to the fourth exhaust branch pipe 124 and enters the EGR pipeline, in this state, when the telescopic part 220 in the cylinder body 210 is in the extended state, the exhaust gas can be blocked from flowing to the direction of the gas intake port 140, so that more exhaust gas flows into the transition pipe 130 through the exhaust port, and when the telescopic part 220 in the cylinder body 210 is in the retracted state, because the transition pipe 130 is a bent pipe structure, under the action of the pressure difference, more exhaust gas can flow to the direction of the gas intake.

After the structure is arranged, the telescopic state of the telescopic component 220 can be determined when the engine is in different working conditions through calibration so as to meet the EGR rate requirement of the corresponding working conditions. On the basis of the structure, the basic principle is that when the EGR rate is required to be small, the telescopic component 220 is in an extending state, so that more exhaust gas can flow out of the exhaust port, only a small part of the exhaust gas enters the gas taking port 140, and the opening degree of the EGR valve can be relatively large, so that the throttling loss in the EGR pipeline is reduced, and the accurate measurement of the EGR rate can be ensured; when the demand for EGR rate is high, the retractable member 220 is in a retracted state, so that more exhaust gas can enter the gas intake port 140, thereby improving the EGR gas intake capability and ensuring that the engine meets the emission standard.

It is right above that the utility model provides an EGR system of engine has carried out the detailed introduction. The principles and embodiments of the present invention have been explained herein using specific examples, and the above descriptions of the embodiments are only used to help understand the method and its core ideas of the present invention. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, the present invention can be further modified and modified, and such modifications and modifications also fall within the protection scope of the appended claims.

Claims (10)

1. The EGR system of the engine comprises a gas taking pipeline, wherein the gas taking pipeline is communicated with an exhaust pipeline of the engine; the exhaust pipe is characterized by further comprising an adjusting device connected with the exhaust pipe, the adjusting device comprises a driving component and a blocking component, the blocking component is arranged close to an exhaust port of the exhaust pipe, and the driving component is used for driving the blocking component to act and adjust the exhaust volume flowing out through the exhaust port.

2. The EGR system of claim 1 wherein the baffle member comprises a cylinder and a telescoping member, the telescoping member comprising a piston head that mates with the internal cavity of the cylinder and a baffle connected to the piston head, the piston head dividing the internal cavity of the cylinder into a first chamber and a second chamber, the baffle being located in the second chamber and extending through an end wall of the cylinder into the exhaust conduit; the driving component is used for driving the telescopic component to stretch and retract so as to adjust the length of the baffle plate extending into the exhaust pipeline.

3. The EGR system of claim 2 wherein the drive component comprises a source of oil and a control valve in communication with the first chamber through an oil line, the control valve being switchable between two operating positions: and the first cavity is communicated with the oil source through the oil pipe, and is positioned at the second working position, and the first cavity is communicated with the oil return pipeline through the oil pipe.

4. The EGR system of claim 3, wherein the oil source is specifically a sump of the engine, the control valve has three ports, a first port is connected to the sump through an oil pump, a second port is connected to the oil return line, and a third port is connected to the oil pipe; the valve core of the control valve is located at the first working position, the valve core blocks the second oil port, the first oil port is communicated with the third oil port through the valve cavity of the control valve, the valve core is located at the second working position, the valve core blocks the first oil port, and the second oil port is communicated with the third oil port through the valve cavity.

5. The EGR system of claim 4, wherein the control valve is a solenoid valve comprising a valve body and the valve core disposed in the valve body, one end of the valve body is provided with a solenoid valve seat, and a return elastic member is disposed between the solenoid valve seat and the valve core.

6. The EGR system of claim 3 wherein the drive component further comprises a resilient element located within the second chamber, both ends of the resilient element abutting an end wall of the cylinder and the piston head, respectively.

7. The EGR system of claim 6 wherein there are two of said resilient elements disposed on either side of said dividing baffle.

8. The EGR system of any of claims 2-7 wherein the exhaust conduit comprises an exhaust manifold and four exhaust branches arranged along the length of the exhaust manifold, each of the four exhaust branches communicating with the exhaust manifold; the exhaust pipeline further comprises a transition pipe connected with the exhaust port; the connecting position of the transition pipe and the exhaust main pipe is positioned in the middle of the exhaust main pipe, and two exhaust branch pipes are respectively arranged on two sides of the connecting position of the transition pipe and the exhaust main pipe; the baffle plate extends into the middle position of the exhaust main pipe.

9. The EGR system of claim 8 wherein said gas pick-up line is connected to said exhaust manifold and is disposed adjacent to one of said exhaust manifolds connected to an end of said exhaust manifold.

10. The EGR system of any of claims 2-7, wherein the cylinder block comprises a cylinder body and a first end cover and a second end cover at two ends of the cylinder body, the first end cover and the second end cover are respectively connected with two ends of the cylinder body in a sealing manner, wherein the second end cover is fixedly connected with the exhaust pipeline, and the baffle plate penetrates through the second end cover and extends into the exhaust pipeline.

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