CN219327571U

CN219327571U - Waste gas bypass device and turbocharger with same

Info

Publication number: CN219327571U
Application number: CN202320251921.XU
Authority: CN
Inventors: 张秋瑾; 邹健; 范红
Original assignee: Wuxi Cummins Turbo Technologies Co Ltd
Current assignee: Wuxi Cummins Turbo Technologies Co Ltd
Priority date: 2023-02-17
Filing date: 2023-02-17
Publication date: 2023-07-11
Anticipated expiration: 2033-02-17

Abstract

The utility model provides a waste gas bypass device and a turbocharger with the same, wherein the waste gas bypass device comprises: a valve rod, a bushing, a rocker arm, and a seal; the first end of the valve rod is connected with the rocker arm; the bushing is sleeved outside the valve rod; a first gap is arranged between the radial inner wall of the bushing and the radial outer wall of the valve rod; a second gap is arranged between the first end of the bushing and the rocker arm; a containing part is arranged on the radial inner wall of the first end of the bushing; the sealing part is arranged in the accommodating part and sleeved outside the valve rod; the sealing part comprises a sealing gasket sleeved outside the valve rod; a third gap is arranged between the radial inner wall of the sealing gasket and the radial outer wall of the valve rod; the radial thickness of the third gap is less than the radial thickness of the first gap; an axial first end surface of the sealing gasket facing away from the rocker arm is in contact with an axial inner wall of the receiving portion. The turbocharger includes a wastegate device. The utility model can reduce the flow area of air flow between the valve rod and the bushing.

Description

Waste gas bypass device and turbocharger with same

Technical Field

The utility model belongs to the technical field of engines, and particularly relates to a waste gas bypass device and a turbocharger with the same.

Background

The turbocharger technology is an important energy-saving means of the engine, can effectively improve the power of the engine and improve the fuel economy, and particularly brings great comprehensive benefits to people in the aspects of saving fuel, reducing emission and the like, and is one of important development trends of automobile engines in the future. To ensure low speed torque of the engine, the turbine end of the turbocharger typically employs a turbine of small moment of inertia, i.e., a smaller diameter turbine; however, in order to ensure that the turbine does not fail due to overspeed during high-speed operation of the engine, it is necessary to provide a wastegate valve at the turbine end in order to bypass excess exhaust gas, thereby reducing the load on the turbine. As shown in fig. 1, the conventional turbocharger includes a valve stem 1 and a bushing 2, and since the valve stem 1 and the bushing 2 need to transmit motion, exhaust gas cannot be completely sealed between the valve stem 1 and the bushing 2. However, when the back pressure in the bypass valve area of the turbocharger is relatively high, exhaust gas may escape from the gap between the valve stem 1 and the bush 2, black smoke may be easily sprayed directly on parts adjacent to the turbocharger by the high pressure, and the parts around the rocker arm 3 may be blackened.

Disclosure of Invention

The utility model aims to overcome the defects of the prior art and provides a waste gas bypass device and a turbocharger with the waste gas bypass device.

In order to solve the technical problems, the utility model adopts the following technical scheme: a wastegate apparatus comprising: a valve rod, a bushing, a rocker arm, and a seal; the first end of the valve rod is connected with the rocker arm; the bushing is sleeved outside the valve rod; a first gap is arranged between the radial inner wall of the bushing and the radial outer wall of the valve rod; a second gap is arranged between the first end of the bushing and the rocker arm; a receiving portion is provided on a radially inner wall of the first end of the bushing; the sealing part is arranged in the accommodating part and sleeved outside the valve rod; the sealing part comprises a sealing gasket sleeved outside the valve rod; a third gap is arranged between the radial inner wall of the sealing gasket and the radial outer wall of the valve rod, and the radial thickness of the third gap is smaller than that of the first gap; an axial first end face of the sealing gasket, which faces away from the rocker arm, is in contact with an axial inner wall of the accommodating portion.

In a specific embodiment, the sealing portion includes: an elastic portion and a shoulder portion; the blocking shoulder part and the elastic part are arranged in the accommodating part and are respectively sleeved outside the valve rod; a fourth gap is arranged between the radial inner wall of the blocking shoulder part and the radial outer wall of the valve rod, and the radial thickness of the fourth gap is larger than or equal to that of the third gap; the radial outer wall of the blocking shoulder part is fixed with the radial inner wall of the accommodating part; the elastic part is axially arranged between the blocking shoulder part and the sealing gasket; the axial first end face of the elastic part is contacted with the axial second end face, close to the rocker arm, of the sealing gasket, and the axial second end face of the elastic part is contacted with the axial end face, away from the rocker arm, of the shoulder part; a fifth gap is arranged between the radial inner wall of the elastic part and the radial outer wall of the valve rod, and the radial thickness of the fifth gap is larger than or equal to that of the third gap.

In a specific embodiment, an annular groove is circumferentially arranged on the radially inner wall of the accommodating part, and the radially outer wall of the blocking shoulder part is arranged in the annular groove.

In a specific embodiment, the elastic portion includes a spring.

In a specific embodiment, the stop shoulder comprises a snap ring.

In one embodiment, the wastegate device further comprises a valve body coupled to the second end of the valve stem by a coupling.

In a specific embodiment, the second end of the valve stem is connected to the first end of the connecting portion, and the second end of the connecting portion is connected to the valve body.

In a specific embodiment, the second end of the bushing is in contact with the first end of the connection portion via a seal.

In a specific embodiment, the valve body comprises a bypass valve.

In a specific embodiment, the axially inner wall of the receiving portion is provided as a conical surface.

In one embodiment, the taper angle of the tapered surface is 160 to 178 degrees.

In a specific embodiment, the taper angle of the tapered surface is 175 degrees.

In a specific embodiment, the axially inner wall of the receptacle is arranged as an annular plane.

A turbocharger includes the wastegate device.

Compared with the prior art, the utility model has the beneficial effects that:

1. according to the waste gas bypass device, the sealing gasket is arranged between the radial inner wall of the bushing and the radial outer wall of the valve rod, so that the flow area of air flow between the valve rod and the bushing is reduced, the air leakage is reduced, the possibility that the air flow is sprayed on parts adjacent to the turbocharger is effectively reduced, and the parts around the rocker arm are prevented from being smoked.

2. The waste gate bypass device is provided with the elastic part and the blocking shoulder part, the elastic part and the sealing gasket can be fixed in the accommodating part by the blocking shoulder part, the stability is good, the reliability is good, and the stability and the reliability of the sealing gasket can be further improved by the elastic pressure provided by the elastic part.

3. The sealing part of the waste gas bypass device is in a static state in the working process, so that the failure risk can be reduced, the service life is long, and the economy is good.

4. The axial inner wall of the accommodating part of the waste gas bypass device is provided with the conical surface, so that the sealing gasket and the axial inner wall of the accommodating part form a linear sealing structure, the sealing capability of the sealing gasket can be effectively improved, the risk of leakage of air flow from the first axial end surface of the sealing gasket to the axial inner wall of the accommodating part is reduced, and the sealing effect is good.

5. The axial inner wall of the accommodating part of the waste gas bypass device is arranged to be an annular plane, so that the sealing gasket and the axial inner wall of the accommodating part form a surface sealing structure, the sealing effect is good, the risk of material jumping can be reduced, and meanwhile, the abrasion of the sealing gasket and/or the axial inner wall of the accommodating part can be prevented.

6. The waste gas bypass device and the turbocharger have the advantages of simple structure, convenient use and wide market prospect.

Drawings

FIG. 1 is a schematic view showing a partial structure of one embodiment of a prior art wastegate apparatus;

FIG. 2 is a schematic view showing the structure of one embodiment of the wastegate device of the present utility model in which the seal portion is placed in the receiving portion;

FIG. 3 is a schematic view showing a partial structure of one embodiment of the wastegate apparatus of the present utility model;

FIG. 4 is an enlarged schematic view showing a structure in which a gasket of the wastegate device of the present utility model and an inner wall in an axial direction of a housing portion form a line seal;

FIG. 5 is a schematic view showing a partial structure of another embodiment of the wastegate apparatus of the present utility model;

fig. 6 shows a schematic structural view of one embodiment of the turbocharger of the present utility model.

Wherein, 1-valve rod; 2-a bushing; 21-a housing; 211-an axial inner wall of the receptacle 2; 212-an annular groove; 3-rocker arms; 4-sealing part; 41-a gasket; 411—an axial first end face of the gasket 41; 42-an elastic part; 43-a stop shoulder; 5-a valve body; a 6-connection; 61-a first end of the connecting part 6; 62-a second end of the connecting part 6; 7-a seal; 8-conical surface; 9-annular plane.

Detailed Description

The utility model will be further described with reference to examples of embodiments shown in the drawings.

Reference to directional terms such as "inner", "outer", "axial", "radial", etc. in this disclosure is by way of example only with reference to the accompanying drawings. Accordingly, directional terminology is used to describe and understand the utility model and is not limiting of the utility model.

As shown in fig. 2 to 5, the waist gate device of the present utility model includes: a valve stem 1, a bush 2, a rocker arm 3, and a seal 4. Wherein,,

the first end of the valve stem 1 is connected to a rocker arm 3.

The bushing 2 is sleeved outside the valve rod 1. A first gap is provided between the radially inner wall of the bushing 2 and the radially outer wall of the valve stem 1, enabling the air flow to flow out along the first gap. A second gap is provided between the first end of the liner 2 and the rocker arm 3, enabling the airflow to continue to flow out along the second gap. The radially inner wall of the first end of the bushing 2 is provided with a receiving portion 21. As an example, the housing portion 21 penetrates the first end surface of the liner 2, and the sealing portion 4 can be easily placed.

The seal portion 4 is provided in the housing portion 21 and is fitted over the outside of the valve stem 1. The seal portion 4 includes a gasket 41 fitted over the outside of the valve stem 1. A third gap is provided between the radially inner wall of the packing 41 and the radially outer wall of the valve stem 1, and the radial thickness of the third gap is smaller than the radial thickness of the first gap, so that the air flow can flow out along the third gap, and the flow area of the air flow between the valve stem 1 and the bush 2 is reduced. The axial first end face 411 of the gasket 41 facing away from the rocker arm 3 is in contact with the axial inner wall 211 of the accommodating portion 21, and leakage of air flow from between the axial first end face 411 of the gasket 41 and the axial inner wall 211 of the accommodating portion 21 can be prevented.

In use, the third gap between the radially inner wall of the gasket 41 and the radially outer wall of the valve rod 1 can reduce the flow area of the air flow between the valve rod 1 and the bushing 2, and the air leakage is reduced, so that the possibility that the air flow is sprayed on parts adjacent to the turbocharger can be reduced, and the parts around the rocker arm 3 are prevented from being smoked. At the same time, the axial first end face 411 of the gasket 41 facing away from the rocker arm 3 is fitted to the axial inner wall 211 of the accommodating portion 21, so that air flow can be prevented from leaking between the axial first end face 411 of the gasket 41 and the axial inner wall 211 of the accommodating portion 21.

In a specific embodiment, as shown in fig. 2, 3 and 5, the sealing portion 4 includes: a resilient portion 42 and a shoulder portion 43. Wherein,,

the shoulder 43 and the elastic portion 42 are both disposed in the accommodating portion 21 and respectively sleeved outside the valve stem 1.

A fourth gap is provided between the radially inner wall of the stop shoulder 43 and the radially outer wall of the valve stem 1. The radial thickness of the fourth gap is equal to or greater than the radial thickness of the third gap. The radially outer wall of the stop shoulder 43 is fixed to the radially inner wall of the receptacle 21.

The elastic portion 42 is axially disposed between the shoulder portion 43 and the gasket 41. The axial first end surface of the elastic portion 42 is in contact with the axial second end surface of the gasket 41 near the rocker arm 3. The second axial end surface of the elastic portion 42 is in contact with the axial end surface of the shoulder portion 43 facing away from the rocker arm 3. A fifth gap is provided between the radially inner wall of the elastic portion 42 and the radially outer wall of the valve stem 1, and the radial thickness of the fifth gap is equal to or greater than the radial thickness of the third gap.

In use, the elastic portion 42 and the gasket 41 can be fixed in the housing portion 21 by the shoulder portion 43. Meanwhile, the stability and reliability of the gasket 41 can be improved by the elastic pressure provided by the elastic portion 42. In addition, the seal portion 4 is in a stationary state during operation of the waist gate device, and the risk of failure of the seal portion 4 can be reduced.

In a specific embodiment, as shown in fig. 2, 3 and 5, an annular groove 212 is circumferentially provided on the radially inner wall of the accommodating portion 21, and the radially outer wall of the blocking shoulder 43 is provided in the annular groove 212, so that stability and reliability of the blocking shoulder 43 can be improved.

In a specific embodiment, as shown in fig. 2, 3 and 5, the elastic portion 42 includes a spring, and is simple in structure and convenient to use. Preferably, the spring is a wave spring, and has high strength, good flexibility and strong impact resistance.

In a specific embodiment, the blocking shoulder 43 comprises a snap ring, and is simple in structure and convenient to use.

In a specific embodiment, as shown in fig. 6, the wastegate apparatus further includes a valve body 5 capable of opening or closing the outlet of the wastegate flow passage. The valve body 5 is connected to the second end of the valve stem 1 by a connection 6. When the valve rod 1 is used, the connecting part 6 can be driven to drive the valve body 5 to open or close the outlet of the waste gas bypass flow passage by rotating the valve rod 1 clockwise or anticlockwise.

In a specific embodiment, as shown in fig. 6, the second end of the valve stem 1 is connected to the first end 61 of the connecting portion 6, and the second end 62 of the connecting portion 6 is connected to the valve body 5. When the valve is used, the connecting part 6 can be used for conveniently driving the valve body 5 to open or close the outlet of the waste gate runner, and the valve is good in stability and reliability.

In a specific embodiment, as shown in fig. 6, the second end of the bushing 2 is in contact with the first end 61 of the connection portion 6 via the seal 7. In use, the seal 7 improves the tightness with which the second end of the bushing 2 contacts the first end 61 of the connecting portion 6.

In one particular embodiment, as shown in FIG. 6, the valve body 5 includes a bypass valve that can facilitate bypassing excess exhaust gas within the turbocharger.

In a specific embodiment, as shown in fig. 3 and 4, the axial inner wall 211 of the accommodating portion 21 is provided with the tapered surface 8, so that the sealing gasket 41 and the axial inner wall 211 of the accommodating portion 21 can form a linear sealing structure, thereby effectively improving the sealing capability of the sealing gasket 41 and reducing the risk of leakage of air flow from between the axial first end face 411 of the sealing gasket 41 and the axial inner wall 211 of the accommodating portion 21. For example, at a pressure of 1bar (pressure unit, bar), the sealing capacity of the wire sealing structure is improved by 45% compared to the original wastegate device. At a pressure of 1.5 bar, the sealing capacity of the wire seal structure was improved by 49% compared to the original wastegate device.

In a specific embodiment, as shown in fig. 3 and 4, the taper angle of the tapered surface 8 is 160 to 178 degrees, so that the sealing ability of the gasket 41 and the inner axial wall 211 of the housing portion 21 can be further improved. Preferably, as shown in fig. 3 and 4, the taper angle of the taper surface 8 is 175 degrees, so that the sealing capability is strong and the sealing effect is good.

In a specific embodiment, as shown in fig. 5, the axial inner wall 211 of the accommodating portion 21 is configured as the annular plane 9, so that the sealing gasket 41 and the axial inner wall 211 of the accommodating portion 21 form a face sealing structure, the sealing effect is good, the risk of material jumping can be reduced, and meanwhile, abrasion of the sealing gasket 41 and/or the axial inner wall 211 of the accommodating portion 21 can be prevented.

In a specific embodiment, the gas stream comprises an exhaust gas stream.

When the waste gas bypass device is used, the third gap is utilized to reduce the flow area of air flow between the valve rod 1 and the bushing 2, and the air leakage is reduced, so that the possibility that the air flow is sprayed on parts adjacent to the turbocharger can be effectively reduced, and the parts around the rocker arm 3 are prevented from being blacked. Meanwhile, the axial first end face 411 of the packing 41 is bonded to the axial inner wall 211 of the housing portion 21, and leakage of air flow from between the axial first end face 411 of the packing 41 and the axial inner wall 211 of the housing portion 21 can be prevented. The sealing portion 4 is in a stationary state during operation of the waist gate device, and is not likely to fail.

On the basis of the above embodiments, as shown in fig. 2 to 6, the present utility model proposes a turbocharger including the wastegate device.

When the turbocharger is used, the third gap is utilized to reduce the flow area of air flow between the valve rod 1 and the bushing 2, and the air leakage is reduced, so that the possibility that the air flow is sprayed on parts adjacent to the turbocharger can be effectively reduced, and the parts around the rocker arm 3 are prevented from being blackened. Meanwhile, the axial first end face 411 of the packing 41 is bonded to the axial inner wall 211 of the housing portion 21, and leakage of air flow from between the axial first end face 411 of the packing 41 and the axial inner wall 211 of the housing portion 21 can be prevented. The sealing portion 4 is in a stationary state during operation of the waist gate device, and is not likely to fail.

The scope of the present utility model is not limited to the above-described embodiments, and it is apparent that various modifications and variations can be made to the present utility model by those skilled in the art without departing from the scope and spirit of the utility model. It is intended that the present utility model also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.

Claims

1. A wastegate apparatus, comprising: a valve rod (1), a bushing (2), a rocker arm (3) and a sealing part (4);

the first end of the valve rod (1) is connected with the rocker arm (3);

the bushing (2) is sleeved outside the valve rod (1); a first gap is arranged between the radial inner wall of the bushing (2) and the radial outer wall of the valve rod (1); a second gap is arranged between the first end of the bushing (2) and the rocker arm (3); a housing (21) is provided on the radially inner wall of the first end of the bushing (2);

the sealing part (4) is arranged in the accommodating part (21) and sleeved outside the valve rod (1); the sealing part (4) comprises a sealing gasket (41) sleeved outside the valve rod (1); a third gap is arranged between the radial inner wall of the sealing gasket (41) and the radial outer wall of the valve rod (1), and the radial thickness of the third gap is smaller than that of the first gap; an axial first end face (411) of the sealing gasket (41) facing away from the rocker arm (3) is in contact with an axial inner wall of the receptacle.

2. The waist gate device according to claim 1, wherein the sealing portion (4) includes: an elastic portion (42) and a shoulder portion (43);

the blocking shoulder part (43) and the elastic part (42) are arranged in the accommodating part (21) and are respectively sleeved outside the valve rod (1);

a fourth gap is arranged between the radial inner wall of the blocking shoulder part (43) and the radial outer wall of the valve rod (1), and the radial thickness of the fourth gap is larger than or equal to that of the third gap; the radially outer wall of the blocking shoulder (43) is fixed with the radially inner wall of the accommodating part (21);

the elastic part (42) is axially arranged between the blocking shoulder part (43) and the sealing gasket (41); an axial first end surface of the elastic part (42) is in contact with an axial second end surface of the sealing gasket (41) close to the rocker arm (3), and an axial second end surface of the elastic part (42) is in contact with an axial end surface of the blocking shoulder part (43) facing away from the rocker arm (3); a fifth gap is arranged between the radial inner wall of the elastic part (42) and the radial outer wall of the valve rod (1), and the radial thickness of the fifth gap is larger than or equal to that of the third gap.

3. The waist gate arrangement according to claim 2, wherein an annular groove (212) is circumferentially provided on a radially inner wall of the receiving portion (21), the radially outer wall of the blocking shoulder portion (43) being provided in the annular groove (212).

4. The wastegate device according to claim 2, wherein the elastic portion (42) comprises a spring and the blocking shoulder portion (43) comprises a snap ring.

5. The wastegate device according to claim 1, further comprising a valve body (5), the valve body (5) being connected to the second end of the valve stem (1) by means of a connection (6).

6. The wastegate device according to claim 5, wherein the second end of the valve stem (1) is connected to a first end (61) of the connecting portion (6), and a second end (62) of the connecting portion (6) is connected to the valve body (5).

7. The wastegate device according to claim 6, wherein the second end of the bushing (2) is in contact with the first end (61) of the connection portion (6) by means of a seal (7).

8. The wastegate device according to claim 5, wherein the valve body (5) comprises a bypass valve.

9. The wastegate device according to claim 1, characterized in that the axially inner wall (211) of the receptacle (21) is provided as a conical surface (8).

10. The wastegate device according to claim 9, wherein the taper angle of the conical surface (8) is 160-178 degrees.

11. The wastegate device according to claim 9, wherein the taper angle of the conical surface (8) is 175 degrees.

12. The wastegate device according to claim 1, characterized in that the axial inner wall (211) of the receptacle (21) is arranged as an annular plane (9).

13. A turbocharger, characterized in that it comprises a wastegate device according to any one of claims 1 to 12.