Back pressure valve for exhaust system pipeline

Abstract

The utility model provides a back pressure valve for an exhaust system pipeline. The back pressure valve comprises a valve body, a valve shaft and a first spring cap, a first valve body pipe part is arranged on the surface of one side of the valve body; the valve shaft is rotationally connected to the valve body, and one end of the valve shaft penetrates through the first valve body pipe part; the first spring cap comprises a first end cover, a first outer ring and a first inner ring, the first end cover is fixedly connected to the first valve body pipe part, the outer side of the first end cover is bent to form the first outer ring, and the inner side of the first end cover is bent to form the first inner ring, so that a hidden space is formed between the first outer ring and the first inner ring; the first inner ring is attached to the first valve body pipe part; the contact area between the torsion spring and the first valve body pipe part is increased, the welding precision of the first spring cap is improved, and meanwhile a hidden space is provided for the torsion spring.

Description

Technical Field

[0001] The utility model relates to the technical field of NVH of automobile exhaust systems, in particular to a back pressure valve used on exhaust system pipelines. Background Art

[0002] At present, the chassis of hybrid vehicles has greatly increased its overall weight due to the battery pack, and new requirements have been put forward for the chassis layout. The exhaust system cannot be arranged in a relatively spacious space like traditional fuel vehicles. Based on the current background of reducing the volume and cost of automobile exhaust systems, the demand for developing a product that can replace the muffler in automobiles has emerged. When the engine (gasoline or diesel engine) of a motor vehicle is working, a certain back pressure will be generated due to the exhaust pipe, muffler, exhaust filter, etc. in the exhaust system. The back pressure usually changes with the engine speed. The function of the back pressure valve is to increase the back pressure of the exhaust system to achieve the effect of noise reduction.

[0003] The exhaust system is installed on the chassis of the car as a whole. Compared with the static structure (internal components) in the entire gas system, the failure of moving parts is very easy to occur, and its life will lower the reliability value of the entire system. If the moving parts in the system are damaged or fail, they will face the situation of overall replacement. Therefore, its modular combination design also needs to be explored. Summary of the invention

[0004] In view of the shortcomings of the prior art, the utility model provides a back pressure valve for an exhaust system pipeline. The structural design of the first spring cap increases the contact area with the first valve body pipe portion, improves the welding accuracy of the first spring cap, and provides a hidden space for the torsion spring to protect the torsion spring. The technical solution adopted by the utility model is:

[0005] A back pressure valve for an exhaust system pipeline, comprising a valve body, a valve shaft, a valve plate, a first spring cap, a second spring cap, and a torsion spring;

[0006] A first valve body tube portion is provided on one side surface of the valve body;

[0007] The valve shaft is rotatably connected to the valve body, and one end of the valve shaft passes through the first valve body pipe portion;

[0008] The valve plate is arranged in the valve cavity of the valve body, and the valve plate is fixedly connected to the valve shaft along the axis of the valve shaft;

[0009] The first spring cap comprises a first end cover, a first outer ring and a first inner ring, the first end cover is fixedly connected to the first valve body tube portion, the first end cover is bent at the outer side to form the first outer ring, and the first end cover is bent at the inner side to form the first inner ring, so that a hidden space is formed between the first outer ring and the first inner ring, and the first inner ring is attached to the first valve body tube portion;

[0010] The second spring cap is fixed on the valve shaft;

[0011] The torsion spring is located in the hidden space, and two pins on the torsion spring are respectively connected to the first spring cap and the second spring cap.

[0012] Furthermore, the first end cover is provided with a first notch for the pin of the torsion spring to insert.

[0013] Furthermore, a tube protrusion is provided on the surface of the tube portion of the first valve body, and a side surface of the first end cover abuts against the tube protrusion.

[0014] Furthermore, the second spring cap includes a second end cover and a second outer ring, the second end cover is sleeved on the valve shaft and arranged parallel to the first end cover, the outer side of the second end cover is bent to form the second outer ring, and the second outer ring covers the end of the torsion spring.

[0015] Furthermore, the axis of the second outer ring and the axis of the first outer ring coincide with the axis of the valve shaft respectively, and the diameters of the second outer ring and the first outer ring are the same.

[0016] Furthermore, the second outer ring is provided with a second notch for the pin of the torsion spring to insert.

[0017] Furthermore, a second valve body tube portion is provided on one side of the valve body away from the first valve body tube portion, and one end of the valve shaft extends into the second valve body tube portion and is rotationally sealed with the valve shaft via a deep groove ball bearing.

[0018] Furthermore, a first blocking cover is arranged inside the second valve body tube portion.

[0019] Furthermore, the first valve body tube portion and the valve shaft are sealed and rotatably connected via a sealing ring bearing, one side of the sealing ring bearing abuts against a step in the first valve body tube portion, and the other side abuts against a shaft shoulder on the valve shaft.

[0020] Furthermore, a graphite pad is provided on one side of the valve shaft shoulder away from the sealing retainer ring bearing, and a second plugging cover is provided on the other side of the graphite pad, and the second plugging cover is tightly matched with the first valve body tube portion.

[0021] Advantages of the utility model:

[0022] The structural design of the first spring cap increases the contact area with the first valve body tube portion, improves the welding accuracy of the first spring cap, and provides a hidden space for the torsion spring to protect the torsion spring.

[0023] The first spring cap and the second spring cap are arranged at an interval without contact, thereby avoiding mutual friction between the two due to deformation of the torsion spring and reducing component wear;

[0024] The first outer ring and the second outer ring have the same diameter, which simplifies the mold size design of the first spring cap and the second spring cap. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is the floor plan of this application.

[0026] Figure 2 for Figure 1 Middle AA section view.

[0027] Figure 3 It is the structural diagram of the first spring cap.

[0028] Figure 4 It is the structural diagram of the second spring cap.

[0029] Figure 5 This is an exploded view of the valve body, valve shaft and valve plate assembly.

[0030] Figure 6 This is a schematic diagram of the structure of this application.

[0031] In the figure: 1-valve body, 110-first valve body tube, 111-tube protrusion, 120-second valve body tube, 2-valve shaft, 3-valve plate, 4-first spring cap, 410-first end cover, 420-first outer ring, 430-first inner ring, 440-first notch, 5-second spring cap, 510-second end cover, 520-second outer ring, 530-second notch, 6-torsion spring, 7-deep groove ball bearing, 8-first plugging cover, 9-sealing retaining ring bearing, 10-graphite pad, 11-second plugging cover. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0033] Please see attached Figure 1-6The present application proposes a back pressure valve for an exhaust system pipeline, comprising a valve body 1, a valve shaft 2, a valve plate 3, a first spring cap 4, a second spring cap 5, and a torsion spring 6; a first valve body pipe portion 110 is provided on one side surface of the valve body 1; the valve shaft 2 is rotatably connected to the valve body 1, and one end thereof passes through the first valve body pipe portion 110; the valve plate 3 is arranged in a valve cavity of the valve body 1, and the valve plate 3 is fixedly connected to the valve shaft 2 along the axis of the valve shaft 2; the first spring cap 4 comprises a first end cover 410, a first outer ring 420 and a first inner ring 4 30, the first end cover 410 is fixedly connected to the first valve body tube portion 110, the outer side of the first end cover 410 is bent to form a first outer ring 420, and the inner side of the first end cover 410 is bent to form a first inner ring 430, so that a hidden space is formed between the first outer ring 420 and the first inner ring 430, and the first inner ring 430 is fitted to the first valve body tube portion 110; the second spring cap 5 is fixed on the valve shaft 2; the torsion spring 6 is located in the hidden space, and the two pins thereon are respectively connected to the first spring cap 4 and the second spring cap 5.

[0034] It is easy to understand that the main function of the exhaust valve in the application of the automobile engine exhaust system is to reduce the back pressure in the exhaust pipe. Because when the automobile engine is running, the exhaust needs to be discharged from the cylinder to ensure the smooth operation between normal cylinder work. However, the recoil wave and pressure generated during the exhaust process will generate back pressure in the exhaust pipe, which will have a negative impact on the efficiency and power performance of the engine, and reduce the performance and life of the engine. Therefore, the back pressure valve adjusts the back pressure in the pipeline to achieve the purpose of reducing the back pressure, thereby ensuring that the engine can work normally. Specifically, when the engine is running under high load, the valve plate in the back pressure valve drives the valve shaft to rotate under the action of pressure so that the valve cavities on both sides of the valve plate are connected to complete the exhaust, which can effectively reduce the back pressure in the exhaust pipe, reduce energy loss, and improve the power performance of the engine. At the same time, the back pressure valve can also improve the low-torque performance of the engine, so that the engine can output sufficient torque in the low-speed area.

[0035] When the first spring cap 4 is fixed on the first valve body tube portion 110, the cooperation between the first inner ring 430 and the first valve body tube portion 110 is utilized to make the inner cylindrical surface of the first inner ring 430 fit with the outer cylindrical surface of the first valve body tube portion 110, thereby increasing the contact area between the first spring cap 4 and the first valve body tube portion 110 and ensuring the coaxiality between the two. Then, the connecting gap between the first end cover 410 and the first valve body tube portion 110 is welded to fix the first spring cap 4. At the same time, the hidden space is parallel to the torsion spring 6 to avoid jamming of the torsion spring 6.

[0036] After the first spring cap 4 is fixed by welding, the torsion spring 6 is extended into the hidden space so that one pin is connected to the first spring cap 4, and then the second spring cap 5 is sleeved on the valve shaft 2 so that the other pin of the torsion spring 6 is connected to the second spring cap 5, and finally the second spring cap 5 is welded and fixed on the valve shaft 2 to complete the assembly of the back pressure valve. When the back pressure valve is opened, the valve plate 3 drives the valve shaft 2 to rotate around its own axis under the action of air pressure, and the valve cavity of the valve body 1 is connected to the front and rear channels of the valve body 1 to achieve exhaust, and at the same time, the valve shaft 2 drives the second spring cap 5 to rotate, so that the torsion spring 6 generates torque to counteract the air pressure until the pressure is balanced.

[0037] In a specific embodiment, in order to facilitate the quick installation of the pin of the torsion spring 6 on the first spring cap 4, as shown in the attached Figure 3 As shown, the first end cover 410 is provided with a first notch 440 for the pin of the torsion spring 6 to pass through.

[0038] In a specific embodiment, in order to realize the positioning of the first spring cap 4 on the first valve body tube portion 110 before welding, as shown in the attached Figure 2 As shown, a tube protrusion 111 is provided on the surface of the first valve body tube portion 110 , and a side surface of the first end cover 410 abuts against the tube protrusion 111 .

[0039] In this application, if attached Figure 2 and Figure 4 As shown, the second spring cap 5 includes a second end cover 510 and a second outer ring 520. The second end cover 510 is sleeved on the valve shaft 2 and arranged parallel to the first end cover 410. The outer side of the second end cover 510 is bent to form the second outer ring 520. The second outer ring 520 covers the end of the torsion spring 6.

[0040] Specifically, a hole or a groove is set in the middle of the second end cover 510, which can match the axial section of the valve shaft 2. The purpose of protecting the torsion spring 6 is achieved by putting the second end cover 510 on the valve shaft 2 and covering the other end of the torsion spring 6. Then the other pin of the torsion spring 6 is connected to the second spring cap 5, and the second end cover 510 is welded and fixed to the valve shaft 2 to complete the installation of the second spring cap 5.

[0041] In a specific embodiment, the axis of the second outer ring 520 and the axis of the first outer ring 420 coincide with the axis of the valve shaft 2, and the diameters of the second outer ring 520 and the first outer ring 420 are the same. By limiting the size of the first outer ring 420 and the second outer ring 520, the mold size design of the two spring caps is facilitated, and the manufacturing cost is reduced. At the same time, the first outer ring 420 and the second outer ring 520 are opposite but not in contact, which avoids the mutual friction between the first spring cap 4 and the second spring cap 5, reduces wear, and the pressure for opening the valve plate 3 is completely borne by the torsion spring 6, which is also conducive to the test between the torque and the valve opening pressure.

[0042] Furthermore, in order to facilitate the quick installation of the pin of the torsion spring 6 on the second spring cap 5 , a second notch 530 for the pin of the torsion spring 6 to be inserted is provided on the second outer ring 520 .

[0043] In this application, if attached Figure 2 As shown, in order to complete the rotational connection between the valve shaft 2 and the valve body 1 on the basis of avoiding the structure of the valve plate 3, a second valve body tube portion 120 is provided on the side of the valve body 1 away from the first valve body tube portion 110, and one end of the valve shaft 2 extends into the second valve body tube portion 120 and is rotationally sealed and connected to the valve shaft 2 through a deep groove ball bearing 7.

[0044] The valve shaft 2 is supported by the deep groove ball bearing 7, which ensures the reliability of the valve body 1 structure. In addition, under the frequent impact of airflow inside the exhaust pipe in the exhaust system, the valve shaft 2 will cause other components to be affected by variable loads, and the deep groove ball bearing 7 can reduce this impact.

[0045] Furthermore, a first plugging cover 8 is provided in the second valve body tube portion 120. The first plugging cover 8 is inserted into the second valve body tube portion 120 and tightly matched with the inner cylindrical surface of the second valve body tube portion 120, and the deep groove ball bearing 7 is sealed inside the second valve body tube portion 120 to ensure the sealing of the valve shaft 2.

[0046] In this application, if attached Figure 2 As shown, the first valve body tube portion 110 and the valve shaft 2 are sealed and rotatably connected via a sealing ring bearing 9, one side of the sealing ring bearing 9 abuts against a step in the first valve body tube portion 110, and the other side abuts against a shoulder on the valve shaft 2. The sealing ring bearing 9 is specifically a deep groove ball bearing with sealing rings added on both sides, which can further improve the sealing effect.

[0047] A graphite pad 10 is provided on the side of the shoulder of the valve shaft 2 away from the sealing ring bearing 9, and a second plugging cover 11 is provided on the other side of the graphite pad 10, and the second plugging cover 11 is tightly matched with the first valve body tube 110. When in use, the outer cylindrical surface of the graphite pad 10 is interference-fitted with the inner cylindrical surface of the second valve body tube 120, and the inner cylindrical surface will move relative to the valve shaft 2, so the sealing ring bearing 9 is used to compensate for this sealing defect; further, the second plugging cover 11 is tightly matched with the second valve body tube 120 to seal the graphite pad 10, thereby ensuring the sealing performance of the valve shaft 2.

[0048] In one embodiment, as shown in the attached Figure 5 As shown, the shape of the valve cavity in the valve body 1 is adapted to the valve plate 3, the upper side of which is rectangular and the lower side is arc-shaped, and the top of the valve plate 3 is connected to the valve shaft 2; this is conducive to the complete opening of the valve plate 3 in the valve cavity when the valve shaft 2 rotates, the rotation space of the valve plate 3 is not restricted, and the opening angle of the valve plate 3 is increased under a larger impact pressure, thereby avoiding damage to the valve plate 3.

[0049] In summary, the present application has the effect of facilitating welding positioning and protecting the torsion spring. There is no interference between the two spring caps, and the back pressure valve opens stably.

[0050] Finally, it should be noted that the above specific implementation methods are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to examples, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A back pressure valve for an exhaust system pipeline, characterized in that: It comprises a valve body (1), a valve shaft (2), a valve plate (3), a first spring cap (4), a second spring cap (5), and a torsion spring (6); A first valve body tube portion (110) is provided on one side surface of the valve body (1); The valve shaft (2) is rotatably connected to the valve body (1), and one end of the valve shaft passes through the first valve body pipe portion (110); The valve plate (3) is arranged in the valve cavity of the valve body (1), and the valve plate (3) is fixedly connected to the valve shaft (2) along the axis of the valve shaft (2); The first spring cap (4) comprises a first end cover (410), a first outer ring (420) and a first inner ring (430); the first end cover (410) is fixedly connected to the first valve body tube portion (110); the outer side of the first end cover (410) is bent to form the first outer ring (420); the inner side of the first end cover (410) is bent to form the first inner ring (430), so that a hidden space is formed between the first outer ring (420) and the first inner ring (430); the first inner ring (430) is fitted to the first valve body tube portion (110); The second spring cap (5) is fixed on the valve shaft (2); The torsion spring (6) is located in the hidden space, and two pins on the torsion spring are respectively connected to the first spring cap (4) and the second spring cap (5).

2. The back pressure valve for exhaust system pipeline according to claim 1, characterized in that: The first end cover (410) is provided with a first notch (440) for the pin of the torsion spring (6) to pass through.

3. The back pressure valve for exhaust system pipeline according to claim 1, characterized in that: A tube protrusion (111) is provided on the surface of the first valve body tube portion (110), and a side surface of the first end cover (410) abuts against the tube protrusion (111).

4. The back pressure valve for exhaust system pipeline according to claim 1, characterized in that: The second spring cap (5) comprises a second end cover (510) and a second outer ring (520); the second end cover (510) is sleeved on the valve shaft (2) and arranged parallel to the first end cover (410); the outer side of the second end cover (510) is bent to form the second outer ring (520); and the second outer ring (520) covers the end of the torsion spring (6).

5. The back pressure valve for exhaust system pipeline according to claim 4, characterized in that: The axis of the second outer ring (520) and the axis of the first outer ring (420) respectively coincide with the axis of the valve shaft (2), and the diameters of the second outer ring (520) and the first outer ring (420) are the same.

6. The back pressure valve for exhaust system pipeline according to claim 4, characterized in that: The second outer ring (520) is provided with a second notch (530) for the pin of the torsion spring (6) to be inserted through.

7. The back pressure valve for use in an exhaust system pipeline according to any one of claims 1 to 6, characterized in that: A second valve body tube portion (120) is provided on a side of the valve body (1) away from the first valve body tube portion (110), and one end of the valve shaft (2) extends into the second valve body tube portion (120) and is rotatably sealed with the valve shaft (2) via a deep groove ball bearing (7).

8. The back pressure valve for exhaust system pipeline according to claim 7, characterized in that: A first blocking cover (8) is arranged inside the second valve body tube portion (120).

9. The back pressure valve for use in an exhaust system pipeline according to claim 7, characterized in that: The first valve body tube portion (110) and the valve shaft (2) are connected in a sealed rotational manner via a sealing ring bearing (9); one side of the sealing ring bearing (9) abuts against a step in the first valve body tube portion (110), and the other side abuts against a shaft shoulder on the valve shaft (2).

10. The back pressure valve for exhaust system pipeline according to claim 8, characterized in that: A graphite pad (10) is provided on the side of the shaft shoulder of the valve shaft (2) away from the sealing retaining ring bearing (9), and a second plugging cover (11) is provided on the other side of the graphite pad (10), wherein the second plugging cover (11) is tightly matched with the first valve body tube portion (110).

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