Exhaust back pressure adjusting device

Abstract

The utility model relates to the technical field of automobile manufacturing, specifically disclose a kind of exhaust back pressure regulating device, including, valve body shell, form with intake passage and exhaust passage, and with the guiding structure for spool assembly movement, spool assembly, by with the cooperation of guiding structure adaptation cooperation part movably arranged in valve body shell, the shape of guiding structure and cooperation part is complementary to limit the moving track of spool assembly, for adjusting the flow area between intake passage and exhaust passage, transmission mechanism, its output end and spool assembly rigid connection, for driving spool assembly movement, transmission assembly is installed in valve body shell top end, wherein, spool assembly is equipped with first air flow opening, valve body shell is equipped with with the second air flow opening of the shape of first air flow opening complementary, through complementary opening design and rigid connection transmission mechanism, realize the accurate regulation of exhaust back pressure, sealing assembly guarantees the sealing property of cooperation interface, overall structure is compact and reliable.

Description

Technical Field

[0001] This utility model relates to the field of automobile manufacturing technology, specifically to an exhaust back pressure regulating device. Background Technology

[0002] In performance development experiments of small-displacement gasoline engines, the precision and controllability of exhaust back pressure adjustment significantly affect the reference value of experimental data. Single-cylinder engines have small cylinder volumes and low exhaust flow rates, making their power output and emission characteristics highly sensitive to changes in back pressure. During experiments, it is usually necessary to make small, precise adjustments to the back pressure and to monitor the valve core opening status.

[0003] Existing exhaust back pressure regulating devices have limitations in meeting this requirement: traditional butterfly valves and ordinary gate valves mostly adopt simple transmission structures and lack precision deceleration components. During the movement of the valve core, the change in flow cross-sectional area and back pressure often exhibits a non-linear relationship, making it difficult to achieve small-amplitude and stable back pressure regulation. Furthermore, the guide structure design of some devices is simple, and the valve core is prone to displacement under airflow impact, further affecting the regulation accuracy and making it difficult to match the back pressure regulation stability requirements of single-cylinder engine experiments.

[0004] The purpose of this invention is to provide an exhaust back pressure regulating device to solve the problems mentioned in the background art. Utility Model Content

[0005] To achieve the above objectives, this utility model provides an exhaust back pressure regulating device, comprising:

[0006] The valve body housing has an air intake passage and an air exhaust passage, and is provided with a guide structure for the movement of the valve core assembly;

[0007] The valve core assembly is movably disposed within the valve body housing via a mating part adapted to the guide structure. The shapes of the guide structure and the mating part are complementary to limit the movement trajectory of the valve core assembly, and are used to adjust the flow cross-sectional area between the intake passage and the exhaust passage.

[0008] The transmission mechanism, whose output end is rigidly connected to the valve core assembly, is used to drive the valve core assembly to move. The transmission assembly is installed on the top of the valve body housing.

[0009] The valve core assembly is provided with a first airflow opening, and the valve body housing is provided with a second airflow opening whose shape is complementary to that of the first airflow opening;

[0010] The transmission mechanism with complementary openings and rigid connection enables precise adjustment of exhaust back pressure, and the sealing components ensure the sealing of the mating interface. The overall structure is compact and the adjustment is reliable.

[0011] As a further improvement of this utility model, the guide structure is a groove extending along the moving direction of the valve core assembly, and the mating part is a flange on both sides of the valve core assembly that matches the shape of the groove. The two form a concave-convex fit. Through the concave-convex fit between the groove and the flange, the stability and accuracy of the valve core assembly movement are further improved, and deviation is avoided. The concave-convex fit structure enhances the fit between the valve body shell and the valve core assembly, helps to ensure the airflow regulation accuracy, and at the same time improves the impact resistance and durability of the overall structure.

[0012] As a further improvement of this utility model, both the first airflow opening and the second airflow opening are polygonal structures, and their outlines are arranged in reverse order. The inverted arrangement of the polygonal outlines makes the overlapping area of ​​the airflow openings change more regularly, thereby improving the stability and predictability of back pressure regulation.

[0013] As a further improvement of this utility model, the polygonal structure is triangular, and the triangular outlines of the first airflow opening and the second airflow opening are staggered with each other, and the staggered direction is consistent with the moving direction of the valve core assembly. The triangular staggered design combined with the specific staggered direction further optimizes the gradual change characteristics of the flow cross-sectional area and adapts to the back pressure adjustment requirements under different working conditions.

[0014] As a further improvement of this utility model, the transmission mechanism includes a reduction device and a drive device. The reduction device adopts a worm gear transmission structure. The worm is connected to the drive end of the drive device. A screw is meshed inside the worm gear. The bottom end of the screw is connected to the valve core assembly, so as to realize the smooth linear movement of the valve core assembly, with high transmission efficiency and precise power transmission, and reduced drive energy consumption.

[0015] As a further improvement of this utility model, the drive device includes a switchable manual operating mechanism and a mechanical drive mechanism. The manual operating mechanism is a handwheel located at the other end of the worm gear, and the mechanical drive mechanism is a stepper motor or a servo motor. The handwheel and the mechanical drive mechanism switch power via an electromagnetic clutch. When the electromagnetic clutch is energized, the mechanical drive mechanism is connected to the worm gear transmission; when the electromagnetic clutch is de-energized, the handwheel is connected to the worm gear transmission; when the electromagnetic clutch is de-energized, the handwheel is connected to the worm gear transmission. The manual and mechanical drives can be switched, taking into account both emergency operation and automated control needs. The electromagnetic clutch switching mode responds quickly, improving the applicability of the device.

[0016] As a further improvement of this utility model, the valve body housing is also provided with a position indicating mechanism. The position indicating mechanism includes a scale extending along the moving direction of the valve core assembly and an indicator needle fixed to the valve core assembly. The scale is set on the side wall of the valve body housing, and the indicator needle forms a sliding fit with the column of the valve body housing. The end of the indicator needle is in contact with the scale, which intuitively displays the position of the valve core, making it easy for operators to quickly grasp the back pressure adjustment status and improve the ease of operation.

[0017] As a further improvement of this utility model, the inner surface of the valve body housing and the contact surface of the valve core assembly are provided with a wear-resistant treatment layer. The wear-resistant treatment layer reduces the relative wear between the valve body and the valve core, extends the overall service life of the device, and maintains long-term adjustment accuracy.

[0018] As a further improvement of this utility model, the cooperation relationship between the first airflow opening and the second airflow opening is configured to produce a gradual change in the flow cross-sectional area when the valve core assembly moves. The gradual change in the flow cross-sectional area design makes the exhaust back pressure adjustment smoother, avoids the impact of pressure sudden changes on the exhaust system, and improves the system's operational stability.

[0019] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0020] This invention achieves precise control of exhaust back pressure through a complementary airflow opening design and a rigidly connected transmission mechanism, combined with the progressive flow cross-sectional area variation characteristics. This effectively avoids the impact of sudden pressure changes on the system. The combination of worm gear reduction and crank-slider transmission ensures precise and efficient power transmission and smooth valve core movement. The metal elastic seal, combined with high-temperature resistant filling material, maintains good sealing performance under dynamic operating conditions, and the wear-resistant treatment layer on the contact surface between the valve body and the valve core significantly extends the service life of the device.

[0021] Meanwhile, the device features both manual and mechanical drive switching capabilities, adapting to automated control and emergency operation needs. The combination of the scale and indicator needle facilitates real-time monitoring of the adjustment status, enhancing operational convenience. With its compact structure and stable performance, it combines precise adjustment, operational flexibility, and durability, effectively optimizing the operating status of various exhaust systems and offering a wide range of applications. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of Embodiment 1 of the present invention. Figure 1 ;

[0023] Figure 2 This is a schematic diagram of Embodiment 1 of the present invention. Figure 2 ;

[0024] Figure 3 This is a schematic diagram of Embodiment 1 of the present invention. Figure 3 ;

[0025] Figure 4 This is a schematic diagram of Embodiment 1 of the present invention. Figure 4 ;

[0026] Figure 5 This is a schematic diagram of Embodiment 1 of the present invention. Figure 5 ;

[0027] Figure 6 This is a schematic diagram of Embodiment 2 of the present invention. Figure 1 ;

[0028] Figure 7 This is a schematic diagram of Embodiment 2 of the present invention. Figure 2 .

[0029] In the diagram: 1. Valve body housing; 11. Intake passage; 12. Exhaust passage; 13. Second airflow opening; 2. Guide structure;

[0030] 3. Valve core assembly; 31. Mating part; 32. First airflow opening;

[0031] 4. Transmission mechanism; 41. Reduction gear; 42. Screw;

[0032] 5. Position indicating mechanism; 51. Scale; 52. Indicator needle. Detailed Implementation

[0033] To facilitate understanding of this utility model, a more comprehensive description of it will be given below with reference to the accompanying drawings, which show several embodiments of the utility model. However, the utility model can be implemented in different forms and is not limited to the embodiments described in the text. On the contrary, these embodiments are provided to make the disclosure of this utility model more thorough and comprehensive.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the terminology used herein in the description of this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention; the term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0035] The present invention will be further described in detail below with reference to the accompanying drawings.

[0036] Example 1:

[0037] Please see Figure 1-5 This utility model provides an exhaust back pressure regulating device, comprising:

[0038] The valve body housing 1 has an air intake passage 11 and an exhaust passage 12, and is provided with a guide structure 2 for the valve core assembly 3 to move.

[0039] The valve core assembly 3 is movably disposed in the valve body housing 1 through a mating part 31 adapted to the guide structure 2. The guide structure 2 and the mating part 31 have complementary shapes to limit the movement trajectory of the valve core assembly 3, and are used to adjust the flow cross-sectional area between the intake passage 11 and the exhaust passage 12.

[0040] The transmission mechanism 4 has its output end rigidly connected to the valve core assembly 3 and is used to drive the valve core assembly 3 to move. The transmission mechanism is installed on the top of the valve body housing.

[0041] The valve core assembly 3 is provided with a first airflow opening 32, and the valve body housing 1 is provided with a second airflow opening 13 whose shape is complementary to that of the first airflow opening 32.

[0042] The guide structure 2 is a groove extending along the moving direction of the valve core assembly 3, and the mating part 31 is a flange on both sides of the valve core assembly 3 that matches the shape of the groove, and the two form a concave-convex fit.

[0043] The first airflow opening 32 and the second airflow opening 13 are both polygonal structures, and their outlines are arranged in reverse order.

[0044] The polygonal structure is triangular, and the triangular outlines of the first airflow opening 32 and the second airflow opening 13 are offset from each other, and the offset direction is consistent with the moving direction of the valve core assembly 3.

[0045] The transmission mechanism 4 includes a reduction gear 41 and a drive device. The reduction gear 41 adopts a worm gear transmission structure. The worm is connected to the drive end of the drive device. A screw 42 is meshed inside the worm gear. The bottom end of the screw 42 is connected to the valve core assembly 3.

[0046] The drive unit includes a switchable manual operating mechanism and a mechanical drive mechanism. The manual operating mechanism is a handwheel located at the other end of the worm gear, and the mechanical drive mechanism is a stepper motor or a servo motor. The handwheel and the mechanical drive mechanism switch power through an electromagnetic clutch. When the electromagnetic clutch is energized, the mechanical drive mechanism is connected to the worm gear drive; when the electromagnetic clutch is de-energized, the handwheel is connected to the worm gear drive.

[0047] The inner surface of the valve body housing 1 and the contact surface with the valve core assembly 3 are provided with a wear-resistant treatment layer.

[0048] The relationship between the first airflow opening 32 and the second airflow opening 13 is configured to produce a gradual change in the flow cross-sectional area as the valve core assembly 3 moves.

[0049] When in use, when the electromagnetic clutch is energized, the output shaft of the mechanical drive mechanism (stepper motor / servo motor) is rigidly connected to the worm gear through the clutch, and the motor rotation drives the worm gear to rotate synchronously.

[0050] When the electromagnetic clutch is de-energized, the manual operating mechanism (handwheel) is connected to the transmission link of the worm gear, and the operator can directly drive the worm gear to rotate by turning the handwheel.

[0051] The two driving modes are switched without interference via the engagement / disengagement of an electromagnetic clutch, ensuring stable power transmission to the reduction gear 41.

[0052] The worm and worm wheel form a reduction transmission pair. The helical teeth of the worm mesh with the teeth of the worm wheel, converting the high-speed, low-torque input motion into the low-speed, high-torque output motion. An internal thread is opened at the center of the worm wheel, forming a helical transmission engagement with the screw 42. The rotational motion of the worm wheel is converted into the axial linear motion of the screw 42 through the threaded engagement (the helix angle design ensures self-locking, preventing the valve core assembly 3 from moving due to airflow pressure). The bottom end of the screw 42 is rigidly connected to the valve core assembly 3 via a flange, driving the valve core assembly 3 to reciprocate vertically along the guide structure 2 of the valve body housing 1. In the initial state, the first airflow opening 32 of the valve core assembly 3 is completely misaligned with the second airflow opening 13 of the valve body housing 1, and the intake passage 11 and... When the exhaust passage 12 is in the closed state, when the valve core assembly 3 moves upward, the overlapping area of ​​the two inverted triangular openings gradually increases, and the flow cross-sectional area increases linearly with the moving distance. When the valve core assembly 3 moves downward, the overlapping area gradually decreases, and the flow cross-sectional area decreases linearly until it is completely closed. By controlling the moving stroke of the valve core assembly 3, the exhaust back pressure can be continuously and steplessly adjusted. In this embodiment, the flanges on both sides of the valve core assembly 3 are embedded in the groove of the valve body housing 1 to form a clearance fit, which restricts the valve core from shifting in the horizontal direction and ensures that the moving trajectory is strictly along the vertical direction. The contact surface between the valve body housing 1 and the valve core assembly 3 is treated with silicon nitride coating to reduce wear in long-term sliding friction and maintain the fit accuracy.

[0053] The drive device of the transmission mechanism 4 can also retain only the servo motor (mechanical drive mechanism), eliminating the handwheel and electromagnetic clutch. The worm gear is directly rigidly connected to the output shaft of the servo motor, and the valve core assembly 3 is moved by the forward and reverse rotation of the motor. This is suitable for automated control scenarios. By simplifying the structure, the cost is reduced, while retaining the core airflow regulation function. This provides a variety of options and effectively improves the flexibility of the device.

[0054] Example 2:

[0055] Please see Figure 6-7 The valve body housing 1 is also provided with a position indicating mechanism 5. The position indicating mechanism 5 includes a scale 51 extending along the moving direction of the valve core assembly 3 and an indicating needle 52 fixed to the valve core assembly 3. The scale 51 is provided on the side wall of the valve body housing 1, and the indicating needle 52 forms a sliding fit with the column of the valve body housing 1, and the end of the indicating needle 52 maintains contact with the scale 51.

[0056] In use, the scale 51 is fixed vertically along the side wall of the valve body housing 1. The scale is marked with the valve core movement distance in millimeters and the corresponding percentage of the flow cross-sectional area (0% to 100%). The indicator needle 52 is an L-shaped metal part. Its horizontal section is fixed to the side wall boss of the valve core assembly 3 by bolts, forming a rigid connection with the valve core. When the valve core assembly 3 moves along the guide structure 2, the indicator needle 52 moves synchronously with the valve core. The projection position of the needle tip on the scale indicates the current valve core stroke in real time, realizing the visual feedback of the adjustment status. The horizontal section of the indicator needle 52 is fitted on the column of the valve body housing 1. The column is parallel to the guide groove of the valve body housing 1. When the valve core moves, the radial swing of the valve core is further restricted by the cooperation of the column and the indicator needle 52, which improves the vibration resistance of the overall structure.

[0057] The present invention has been described above by way of example in conjunction with the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvement made by adopting the inventive concept and technical solution of the present invention, or the direct application of the inventive concept and technical solution of the present invention to other occasions without modification, shall be within the protection scope of the present invention.

Claims

1. An exhaust back pressure regulating device, characterized in that: include: The valve body housing (1) has an air intake passage (11) and an exhaust passage (12), and is provided with a guide structure (2) for the valve core assembly (3) to move. The valve core assembly (3) is movably disposed in the valve body housing (1) through a mating part (31) adapted to the guide structure (2). The guide structure (2) and the mating part (31) are complementary in shape to limit the movement trajectory of the valve core assembly (3) and are used to adjust the flow cross-sectional area between the intake passage (11) and the exhaust passage (12). The transmission mechanism (4) has its output end rigidly connected to the valve core assembly (3) and is used to drive the valve core assembly (3) to move. The transmission assembly is installed on the top of the valve body shell. Among them, the valve core assembly (3) is provided with a first airflow opening (32), and the valve body housing (1) is provided with a second airflow opening (13) whose shape is complementary to that of the first airflow opening (32); the first airflow opening (32) and the second airflow opening (13) are both polygonal structures, and their outlines are arranged in reverse order.

2. The exhaust back pressure regulating device according to claim 1, characterized in that: The guide structure (2) is a groove extending along the moving direction of the valve core assembly (3), and the mating part (31) is a flange on both sides of the valve core assembly (3) that matches the shape of the groove, forming a concave-convex fit.

3. The exhaust back pressure regulating device according to claim 1, characterized in that: The polygonal structure is triangular, and the triangular outlines of the first airflow opening (32) and the second airflow opening (13) are staggered, and the staggered direction is consistent with the moving direction of the valve core assembly (3).

4. The exhaust back pressure regulating device according to claim 1, characterized in that: The transmission mechanism (4) includes a speed reduction device (41) and a drive device. The speed reduction device (41) adopts a worm gear transmission structure. The worm is connected to the drive end of the drive device. A screw (42) is meshed inside the worm gear. The bottom end of the screw (42) is connected to the valve core assembly (3).

5. The exhaust back pressure regulating device according to claim 4, characterized in that: The drive unit includes a switchable manual operating mechanism and a mechanical drive mechanism. The manual operating mechanism is a handwheel located at the other end of the worm gear, and the mechanical drive mechanism is a stepper motor or a servo motor. The handwheel and the mechanical drive mechanism switch power through an electromagnetic clutch. When the electromagnetic clutch is energized, the mechanical drive mechanism is connected to the worm gear drive; when the electromagnetic clutch is de-energized, the handwheel is connected to the worm gear drive.

6. The exhaust back pressure regulating device according to claim 1, characterized in that: The valve body housing (1) is also provided with a position indicating mechanism (5). The position indicating mechanism (5) includes a scale (51) extending along the moving direction of the valve core assembly (3) and an indicator needle (52) fixed to the valve core assembly (3). The scale (51) is set on the side wall of the valve body housing (1). The indicator needle (52) forms a sliding fit with the column of the valve body housing (1), and the end of the indicator needle (52) is in contact with the scale (51).

7. The exhaust back pressure regulating device according to claim 1, characterized in that: The inner surface of the valve body housing (1) and the contact surface of the valve core assembly (3) are provided with a wear-resistant treatment layer.

8. An exhaust back pressure regulating device according to any one of claims 1-7, characterized in that: The relationship between the first airflow opening (32) and the second airflow opening (13) is configured to produce a gradual change in the flow cross-sectional area as the valve core assembly (3) moves.

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