CN210396884U

CN210396884U - Exhaust valve seat device of turbocharger

Info

Publication number: CN210396884U
Application number: CN201921307926.XU
Authority: CN
Inventors: 邹健; 吉姆.迈凯文
Original assignee: Wuxi Cummins Turbo Technologies Co Ltd
Current assignee: Wuxi Cummins Turbo Technologies Co Ltd
Priority date: 2019-08-13
Filing date: 2019-08-13
Publication date: 2020-04-24
Anticipated expiration: 2029-08-13

Abstract

The utility model relates to a turbocharger waste gas valve seat device, which comprises a volute and a bypass valve component, wherein the bypass valve component comprises a valve pin, a fin and a valve block, and the valve block is movably arranged on the valve pin; the volute is provided with a bypass hole and a valve seat which are matched with the bypass valve component, the valve seat is provided with a conical surface, the center of the conical surface is overlapped with the center of the bypass hole, the edge of the bypass hole in the conical surface is provided with a circle of sealing annular surface, and the outer diameter of the sealing annular surface is smaller than that of the valve block. The utility model has the advantages of simple and reasonable structure, through at the design of bypass valve hole valve block, can effectively promote bypass valve in use's sealed durability.

Description

Exhaust valve seat device of turbocharger

Technical Field

The utility model relates to a turbo charger exhaust valve seat device belongs to turbo charger equipment technical field.

Background

A turbocharger is a device that provides compressed gas at a pressure greater than ambient pressure to the cylinders of an internal combustion engine, and is typically configured as shown in fig. 1. Generally, a turbocharger comprises a turbine, a compressor and the like, wherein the turbine of a core component is driven by exhaust gas of a runner of a volute component to enable a pressure impeller of the core component to rotate to compress gas, and the pressure of air in an internal combustion engine cylinder is increased under the diffusion of the pressure shell component to increase the density of the air, so that the power output of the engine is improved, and the emission control purpose of the engine is facilitated.

In the process of the development of the internal combustion engine, the dynamic performances of the low-speed end and the high-speed end are continuously improved. For a turbocharger, this requirement directly results in an increase in the amount of intake air at low and high turbocharger speeds. When a turbocharger is designed, the low-speed air inflow requirement of an internal combustion engine can be met by reducing the low-speed flow capacity of a turbine, but when the high-speed air inflow requirement of the internal combustion engine is met and the mechanical limit of the turbocharger is not exceeded, a supercharging technology has two technical routes, namely a turbine nozzle variable cross-section technology, as shown in fig. 2, the technology keeps the position of an outlet nozzle 2 ' of a volute flow channel 1 ' in a minimum opening state when the internal combustion engine is at low speed, impacts a turbine 3 ' to ensure that the internal combustion engine has sufficient air inflow, and moves a nozzle ring to a required position transversely when the internal combustion engine is at high speed, so that the requirement of simultaneously meeting the high-speed air inflow requirement of the internal combustion engine and the mechanical limit of the turbocharger is met by increasing the; another technique is a wastegate valve technique, which, as shown in fig. 3, keeps wastegate valve 4 ' and valve plates 5 in contact with scroll casing 1 at low engine speeds, closing a sealed state, and ensuring a sufficient amount of intake air for the engine, and at high engine speeds, the regulator drives 5 ' and wastegate valve 4 ' to move so as to directly bypass a portion of engine exhaust gas from turbine inlet 6 ' to outlet 7 ', so as to satisfy the requirements of both high-speed internal combustion intake air and supercharger mechanical limits.

For the waste gate valve, how to ensure that the waste gate valve 4', the valve plate 5 and the volute 1 are kept in contact and the sealing capability is closed at the low rotation speed of the internal combustion engine becomes a great difficulty in engineering design, and the sealing performance directly influences the outlet pressure of the compressor of the waste turbo charger and further influences the stability of the performance of the internal combustion engine. The operating temperature of the wastegate valve 4' can at most exceed 700 degrees celsius, making methods such as rubber seals difficult to implement. The most direct method is to process a valve seat plane on the scroll 1 to be in surface-to-surface contact with a plane of the valve plate 5, and the design has the advantages of simple processing, high precision requirement and large fluctuation of initial sealing performance. In the using process, because the internal combustion engine, particularly a diesel internal combustion engine, metal particles and solid salt particles are mixed in exhaust gas, the exhaust gas is easy to adhere to the valve seat plane of the volute 1 and is difficult to completely shake off under a high-temperature environment, and further the sealing performance of the exhaust gas bypass valve is deteriorated.

Disclosure of Invention

An object of the utility model is to overcome exist not enough among the prior art, provide a turbo charger exhaust valve seat device, this valve seat device simple structure, reasonable can improve the wastegate valve sealing performance, but not high with the machining concentricity requirement of exhaust-gas hole to the wear and tear is difficult to appear in the wastegate valve block face.

According to the utility model provides a technical scheme: a turbocharger exhaust gas valve seat device comprises a volute and a bypass valve assembly, wherein the bypass valve assembly comprises a valve pin, a fin and a valve plate, and the valve plate is movably arranged on the valve pin; the volute is provided with a bypass hole and a valve seat which are matched with the bypass valve component, the valve seat is provided with a conical surface, the center of the conical surface is overlapped with the center of the bypass hole, the edge of the bypass hole in the conical surface is provided with a circle of sealing annular surface, and the outer diameter of the sealing annular surface is smaller than that of the valve block.

Further, the width of the single side of the sealing ring-shaped surface is not more than 1 mm.

Further, the outer diameter of the conical surface exceeds the outer diameter of the valve plate.

Furthermore, the included angle between the generatrix of the conical surface and the sealing ring surface is smaller than the deflection angle of the valve plate.

Furthermore, a plane lower than the sealing annular surface is arranged outside the sealing annular surface, and the height difference is controlled within 1 mm.

Compared with the prior art, the utility model, have following advantage:

1. the sealing performance and the durability of the exhaust valve are improved.

2. The machining concentricity requirement of the conical surface of the structural valve seat and the waste gas hole is low, and the surface of a valve plate of the waste gas bypass valve is not easy to wear.

Drawings

Fig. 1 is a schematic structural diagram of the operating principle of a turbocharger.

Fig. 2 is a schematic view of a variable cross-sectional structure.

FIG. 3 is a wastegate valve schematic.

Fig. 4 is a schematic view of the exhaust valve seat assembly when closed.

Fig. 5 is a schematic view of a conventional wastegate valve seat structure.

Fig. 6 is the structure diagram of the waste gas valve seat of the present invention.

Fig. 7 is a top view of the exhaust valve seat of the present invention.

Fig. 8 is a schematic view of an exhaust valve seat according to embodiment 2 of the present invention.

Description of reference numerals: 1-volute, 2-bypass valve assembly, 3-valve pin, 4-fin, 5-valve plate, 6-bypass hole, 7-valve seat, 8-sealing annular face, 9-conical face, 10-plane, 1 ' -volute flow channel, 2 ' -nozzle, 3 ' -turbine, 4 ' -waste gate valve, 5 ' -regulator drive, 6 ' -turbine inlet, 7 ' -outlet.

Detailed Description

The present invention will be further explained with reference to the accompanying drawings.

Example 1

As shown in fig. 4, the utility model relates to a turbocharger exhaust valve seat device, including volute 1, bypass valve subassembly 2 includes valve pin 3, fin 4 and valve block 5, and fin 4 sets up between valve pin 3 and valve block 5, and valve block 5 activity sets up on valve pin 3, and valve block 5 can be on valve pin 3 slight left and right luffing motion;

in order to improve the sealing capability of the waste gate valve, as shown in fig. 4 and 5, a conical surface 9 is processed on the valve seat of the volute 1 and is coincided with the center of the bypass hole 6, and the intersecting line of the conical surface 9 and the center of the bypass hole is a circular line in the same plane, so that the linear contact with the valve plate 5 of the waste gate valve is realized, the linear sealing is carried out, and the sealing performance of the waste gate valve is improved, but the requirement on the machining concentricity of the conical surface 9 of the valve seat and the waste gate hole is high, and in the processing process, a certain material jumping risk exists on the sealing line of the valve seat of; in the application of large impact force, the valve plate surface of the waste gas bypass valve is abraded, so that the sealing performance of the waste gas bypass valve is not facilitated to a certain extent.

The outer diameter of the conical surface 9 exceeds the outer diameter of the valve plate 5. The advantage that the outward extending part of the conical surface 9 exceeds the valve plate 5 is that when the valve plate 5 covers the valve seat 7, because the valve plate 5 can slightly swing up and down on the valve pin 3, the valve plate 5 can firstly contact the extending part of the conical surface 9 and then the valve plate 5 is rebounded to the balance position by the extending part of the conical surface 9 to be attached to the sealing annular surface 8 on the valve seat 7, so that the sealing effect is achieved.

As shown in fig. 6 and 7, a sealing ring surface 8 is arranged in the conical surface 9, the sealing ring surface 8 is a ring-shaped surface arranged at the edge of the bypass hole 6, and the width of one side of the sealing ring surface 8 is not more than 1 mm. The valve seat 7 and the valve plate 5 are in surface contact; the outer diameter of the sealing ring surface 8 is smaller than that of the valve plate 5. The design of the annular surface can reduce the risk of the material jumping of the sealing contact surface between the valve plate 5 and the valve seat 7. The included angle between the generatrix of the conical surface 9 and the sealing ring-shaped surface 8 is smaller than the deflection angle of the valve plate 5, so that the conical surface 9 can rebound the valve plate 5 to a balanced position in time.

Example 2

As shown in FIG. 7, the valve seat 7 of the embodiment 2 is provided with a sealing annular surface 8 at the edge of the bypass hole 6 as in the embodiment 1, except that a plane 10 lower than the sealing annular surface 8 is provided outside the sealing annular surface 8, and the height difference is controlled within 1 mm. Similar to the design of the step, the valve plate 5 can be rebounded to the balance position to be attached to the sealing annular surface 8 on the valve seat 7 by using the plane lower than the sealing annular surface 8, and the same technical effect can be achieved.

It is to be understood that the above embodiments are merely exemplary embodiments that have been employed to illustrate the principles of the present invention, and that the present invention is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.

Claims

1. A turbocharger exhaust gas valve seat device comprises a volute (1) and a bypass valve assembly (2), wherein the bypass valve assembly (2) comprises a valve pin (3), a fin (4) and a valve block (5), and the valve block (5) is movably arranged on the valve pin (3); be equipped with by-pass hole (6) and disk seat (7) of cooperation bypass valve subassembly (2) on volute (1), its characterized in that, set up conical surface (9) on disk seat (7), the center of conical surface (9) and the center coincidence of by-pass hole (6), the edge of by-pass hole (6) is equipped with round sealing ring face (8) in conical surface (9), the external diameter of sealing ring face (8) is less than the external diameter of valve block (5).

2. A turbocharger exhaust valve seat assembly according to claim 1, wherein the single edge of said sealing annular surface (8) has a width not exceeding 1 mm.

3. A turbocharger exhaust valve seat arrangement according to claim 1, wherein the outer diameter of the conical surface (9) is larger than the outer diameter of the valve plate (5).

4. A turbocharger exhaust valve seat arrangement according to claim 3, wherein the angle between the generatrix of the conical surface (9) and the sealing ring surface (8) is smaller than the deflection angle of the valve plate (5).

5. A turbocharger exhaust valve seat assembly according to claim 1, wherein said sealing annular surface (8) is provided with a flat surface (10) outside thereof which is lower than the sealing annular surface (8), and the height difference is controlled to be within 1 mm.