CN216643099U - Waste gas bypass valve, turbocharger and turbocharging system - Google Patents

Abstract

The utility model discloses a waste gas bypass valve, a turbocharger and a turbocharging system. Be provided with first gas passage and second gas passage on the valve casing to, along the thickness direction of valve casing, first gas passage and second gas passage all run through the valve casing. The valve body assembly comprises a valve body, a valve shaft, an upper rocker arm and a lower rocker arm. The valve body is fixedly connected with the valve shaft, one side of the upper rocker arm and one side of the lower rocker arm are respectively and fixedly connected to the valve shaft, and the other sides of the upper rocker arm and the lower rocker arm are respectively and fixedly connected to the valve body. The valve body is positioned in the second gas passage and adapted to the second gas passage, and the valve body is rotatable relative to the second gas passage by the valve shaft so that the valve body can adjust a position opening between opening and closing relative to the second gas passage. The waste gas bypass valve does not need to be provided with a bypass pipe independently, and has the advantages of high integrity, good sealing performance, low noise, high responsiveness and simplicity in arrangement.

Description

Waste gas bypass valve, turbocharger and turbocharging system

Technical Field

The utility model relates to the field of engines, in particular to a waste gas bypass valve, a turbocharger and a turbocharging system.

Background

The exhaust gas turbocharger utilizes the exhaust energy of an engine to push a turbine to do work on a compressor to achieve the purposes of compressing intake air and increasing air density, so that the air input of the engine is increased on the premise of not changing the displacement of the engine, and more fuel oil is further combusted to achieve the purpose of improving the power-per-liter of the engine (the power-per-liter is the total evaluation made on the utilization rate of the working volume of an air cylinder from the angle of the effective power of the engine. Meanwhile, the air compression work comes from the energy of exhaust gas, so that the comprehensive fuel economy of the engine is further improved. Therefore, turbocharged engines have become a major direction in the development of today's conventional internal combustion engines.

Common engines generally match a single stage supercharger, but for high performance engines seeking higher boost power and faster responsiveness, single stage superchargers have not met the target requirements. Research shows that the multistage supercharging system formed by connecting a plurality of exhaust gas turbochargers in series can further improve the boost power of the supercharged engine, further enhance the quick response of the supercharged engine and improve the fuel economy of the supercharged engine. However, in the prior art, the bypass valve of the multi-stage supercharging system formed by connecting a plurality of exhaust gas turbochargers in series is connected by a simple pipeline and a simple bypass valve, the structure of the bypass valve (such as a lift valve, a butterfly valve or a rotary valve) is difficult to meet the requirements of sealing performance and quick response, and the structure of the bypass valve of the arrangement mode is separately arranged on the supercharging system, so that the integrity is low, and the defect that the arrangement of the bypass valve is complicated is also caused.

Therefore, the multi-stage supercharging system in the prior art has the problems that the bypass valve structure is difficult to meet the requirements of sealing performance and quick response, the integrity is low, and the bypass valve is complex to arrange.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the problems that a bypass valve structure of a multistage supercharging system in the prior art is difficult to meet the requirements of sealing performance and quick response, the integrity of the multistage supercharging system is low, and the bypass valve is complex to arrange.

In order to solve the above problem, an embodiment of the present invention provides a wastegate valve including a valve housing and a valve body assembly, wherein the valve housing is provided with a first gas passage and a second gas passage, the second gas passage has a cross-sectional dimension larger than that of the first gas passage, and both the first gas passage and the second gas passage penetrate the valve housing in a thickness direction of the valve housing.

The valve body assembly comprises a valve body, a valve shaft, an upper rocker arm and a lower rocker arm. The valve body is fixedly connected with the valve shaft, the upper rocker arm and the lower rocker arm are both sleeved on the outer wall surface of the valve shaft and are respectively positioned on two sides of the valve body, one side of the upper rocker arm and one side of the lower rocker arm are respectively and fixedly connected onto the valve shaft, and the other sides of the upper rocker arm and the lower rocker arm are respectively and fixedly connected onto the valve body. The valve body is located in the second gas passage and is matched with the second gas passage, and the valve body can rotate relative to the second gas passage through the valve shaft, so that the valve body can adjust the position opening degree between opening and closing relative to the second gas passage. When the valve body is in an open state relative to the second gas passage, gas can flow through at least the second gas passage; when the valve body is in a closed state relative to the second gas passage, gas can only flow through the first gas passage.

By adopting the technical scheme, when the gas does not need to be bypassed, the valve body is in a closed state relative to the second gas channel, and the gas entering the waste gas bypass valve flows through the first gas channel. When gas needs to be bypassed, the valve body is in an open state with respect to the second gas passage, and gas entering the wastegate valve can flow through the first gas passage and the second gas passage. And when the valve body is at the maximum opening degree relative to the second gas channel, because the cross section of the second gas channel is larger than that of the first gas channel, and the blockage of the second gas channel to the gas is small, the gas mainly flows in the second gas channel, thereby ensuring that most of the gas flowing into the waste gas bypass valve is bypassed. During the installation, only need with this waste gate valve install to need by the bypass in the pipeline can, need not to set up the bypass pipe alone for the bypass valve, consequently, compare in the bypass valve that needs set up the bypass pipe alone, this waste gate valve's wholeness is higher, and arranges simplyr. Meanwhile, due to the matching of the valve body and the second gas channel of the valve shell, the waste gas bypass valve has the advantages of good sealing performance and quick response.

Another embodiment of the present invention provides a wastegate valve, wherein two shaft holes are arranged on the inner side wall of the second gas passage of the valve housing, and two ends of the valve shaft are respectively rotatably connected to the second gas passage through the two shaft holes; the two shaft holes penetrate the valve housing along the axial direction of the valve shaft. The valve shaft is provided with a valve body groove, and the valve body groove penetrates through the valve shaft along the direction perpendicular to the valve shaft; and, the valve body is set on the valve shaft through the valve body groove.

Adopt above-mentioned technical scheme, compare in setting up the hinge or other devices that are used for rotating the connection, directly set up two shaft holes on the inside wall of the second gas passage of valve casing for the both ends of valve shaft rotate through two shaft holes and connect the mode of setting on the second gas passage and can make the structure of valve body subassembly simpler, the action is faster. In addition, on the basis that the upper rocker arm and the lower rocker arm are connected with the valve body and the valve shaft, the valve body is embedded on the valve shaft through the valve body groove, so that the stability of connection between the valve body and the valve shaft can be further improved.

Another embodiment of the present invention provides a wastegate valve, wherein the inner sidewall of the second gas passage is respectively provided with a first valve seat and a second valve seat which are protrudingly disposed along the circumferential direction of the second gas passage, one end of the first valve seat extends to one end of the second gas passage, the other end of the first valve seat is transitionally connected with the inner wall surface of the second gas passage to form a first stop surface, one end of the second valve seat extends to the other end of the second gas passage, and the other end of the second valve seat is transitionally connected with the inner wall surface of the second gas passage to form a second stop surface. The first stop surface and the second stop surface can play a stop role on the valve body, in the circumferential direction of the second gas channel, two ends of the first stop surface and two ends of the second stop surface respectively extend obliquely, and two ends of the first stop surface and two ends of the second stop surface are in transition connection to form a first transition surface and a second transition surface. The two shaft holes are respectively arranged between the first transition surface and the second gas channel and between the second transition surface and the second gas channel.

By adopting the technical scheme, when the valve body is in a closed state relative to the second gas channel, the sealing performance of the waste gas bypass valve can be further improved by matching the first valve seat and the second valve seat with the valve body. The positions of the first stop surface and the second stop surface can control the position of the valve body in the closed state.

In another embodiment of the present invention, a wastegate valve is provided and the valve body assembly further includes a first bushing and a second bushing. First axle sleeve and second axle sleeve set up respectively in two shaft holes to, the one end that lies in the valve casing lateral wall on the first axle sleeve is provided with the first holding ring along the protruding setting of circumference of first axle sleeve, and the one end that is close to the valve casing lateral wall on the second axle sleeve is provided with the second holding ring along the protruding setting of circumference of second axle sleeve. The inner side walls of the two shaft holes are provided with a first concave part and a second concave part at positions corresponding to the first positioning ring and the second positioning ring respectively, the first positioning ring is matched with the first concave part, and the second positioning ring is matched with the second concave part.

The outer wall surface of the valve shaft is further provided with two shaft collars which are arranged at intervals along the axis direction of the valve shaft, the two shaft collars are respectively positioned at one end, away from the first positioning ring, of the first shaft collar and one end, away from the second positioning ring, of the second shaft collar, and the two shaft collars are respectively arranged in a protruding mode along the circumferential direction of the valve shaft. The two ends of the valve body groove respectively extend to the two shaft rings.

Adopt above-mentioned technical scheme, the setting up of first axle sleeve and second axle sleeve has guaranteed the compactness that valve shaft and valve casing are connected. The first locating ring and the first concave part are matched to ensure the axial location of the first shaft sleeve relative to the valve shaft, and the second locating ring and the second concave part are matched to ensure the axial location of the second shaft sleeve relative to the valve shaft. The arrangement of the two collars can ensure the axial positioning of the valve shaft relative to the two shaft holes, and at the same time, the arrangement of the two collars can also enhance the strength of the valve shaft.

Another embodiment of the utility model provides a waste gate valve, the valve body assembly further comprises a sealing ring, and the valve shaft is further provided with a sealing ring groove. The sealing ring groove is formed in the outer side wall of one end, extending into the first shaft sleeve, of the valve shaft, and the sealing ring is arranged in the sealing ring groove.

By adopting the technical scheme, no matter the valve body is in a closed state or an open state relative to the second gas passage, the arrangement of the sealing ring groove and the sealing ring can always avoid the leakage of gas from the inner hole of the valve casing, which is provided with the first shaft sleeve, so that the sealing performance of the waste gas bypass valve is improved.

Another embodiment of the utility model provides a waste gate valve, the valve body assembly further comprises a disc spring, the upper rocker arm and the lower rocker arm respectively comprise a body and a supporting block, a first fixing part is arranged on the side wall of the body, a first fixed part is arranged on the valve shaft at a position corresponding to the first fixing part, and the first fixing part is matched with the first fixed part, so that the body of the upper rocker arm and the body of the lower rocker arm are both fixedly connected to the valve shaft.

One end of each of the supporting blocks of the upper rocker arm and the lower rocker arm is connected with the corresponding side wall of the body, the other end of each of the supporting blocks of the upper rocker arm and the lower rocker arm extends outwards in the direction perpendicular to the valve shaft, a second fixing part is arranged on each supporting block, and a second fixed part is arranged at the position, corresponding to the second fixing part, on the valve body. The second fixed part is cooperated with the second fixed part, so that the supporting block of the upper rocker arm and the supporting block of the lower rocker arm are fixedly connected to the valve body. The supporting block is also provided with an inwards concave hole part on the side surface close to the valve body, and the disc spring is arranged in the hole part.

Adopt above-mentioned technical scheme, first fixed part and first by the setting of fixed part and second by the fixed part can be convenient for the installation or the dismantlement of valve body and valve shaft to change. The arrangement of the disc spring in the hole part of the supporting block enables the upper rocker arm and the lower rocker arm to be respectively and elastically connected with the valve body, so that the sealing performance of the upper rocker arm, the lower rocker arm and the valve body is improved, and the abrasion between the upper rocker arm and the valve body and between the lower rocker arm and the valve body is reduced. Meanwhile, the arrangement of the disc spring can also improve the contact uniformity between the upper rocker arm and the valve body, so that the effects of noise reduction and vibration prevention are achieved, and the NVH (noise, vibration and harshness) performance of the waste gas bypass valve is improved.

Another embodiment of the utility model provides a wastegate valve, which further comprises an outer rocker arm, an elastic pad and a bowl-shaped plug, wherein one end of the outer rocker arm is fixedly connected to one end of the valve shaft, which penetrates through the first shaft sleeve, and a limit bump extending in a direction perpendicular to the valve shaft and far away from the outer rocker arm is further arranged on one end of the outer rocker arm. The outer wall surface of the valve casing is provided with a limiting pin, and the limiting lug and the limiting pin can be mutually abutted.

The elastic pad is arranged between the outer rocker arm and the first positioning ring. The bowl-shaped plug is arranged at one end of the shaft hole provided with the second shaft sleeve and located on the outer side wall of the valve shell.

By adopting the technical scheme, the valve shaft is in transmission connection with the driving part through the outer rocker arm, so that the driving part can drive the valve body through the outer rocker arm and the valve shaft to adjust the position opening between opening and closing relative to the second gas channel. The limiting pin that sets up on the valve casing outer wall face can with the spacing lug butt that sets up on the outer rocking arm to stop the valve shaft and drive the valve body and further rotate, the position of limiting pin and spacing lug butt is the valve body for the maximum aperture of second gas passage promptly. The setting of the cushion between outer rocking arm and the first locating ring has further avoided gaseous shaft hole that is provided with first axle sleeve from the valve casing to reveal, and the setting of bowl type stopper has avoided gaseous shaft hole that is provided with the second axle sleeve from the valve casing to reveal to this wastegate valve's sealing performance has further been improved.

An embodiment of the utility model also provides a turbocharger comprising the waste gate valve.

Adopt above-mentioned technical scheme, compare in prior art need set up the turbo charger of bypass pipe alone for the bypass valve, turbo charger in this embodiment only need with above-mentioned waste gate valve install to the pipeline that needs by the bypass on, need not to set up the bypass pipe for the bypass valve alone, consequently, this turbo charger's waste gate valve's structure is simpler, the action is faster, and the wholeness is better. In addition, because the elastic piece and the sealing piece are arranged between the valve body assembly and the valve casing of the waste gate valve of the turbocharger, the turbocharger has the advantages of high NVH performance and good sealing performance.

An embodiment of the present invention also provides a turbocharger system including a low-pressure stage turbocharger and a high-pressure stage turbocharger, a turbine casing of the high-pressure stage turbocharger and a turbine casing of the low-pressure stage turbocharger being communicated with each other, and at least the high-pressure stage turbocharger being provided as the above-described turbocharger.

With the above technical solution, the gas is transferred from the first gas passage or the second gas passage of the high-pressure stage turbocharger to the low-pressure stage turbocharger. When the opening degree of the valve body of the high-pressure stage turbocharger relative to the second gas passage is large, most of gas flows into the low-pressure stage turbocharger from the second gas passage of the high-pressure stage turbocharger because the cross section of the second gas passage is larger than that of the first gas passage and the flow resistance at the first gas passage of the high-pressure stage turbocharger is large. When the opening degree of the valve body assembly of the high-pressure stage turbocharger with respect to the second gas passage is small, most of the gas flows from the first gas passage of the high-pressure stage turbocharger into the low-pressure stage turbocharger. Therefore, the turbocharging system can properly adjust the distribution of the gas flow passing through the first gas passage and the second gas passage of the high-pressure stage turbocharger by controlling the opening degree of the valve body of the waste gas bypass valve of the high-pressure stage turbocharger relative to the second gas passage, and further reasonably distribute the working load of the high-pressure stage turbocharger and the low-pressure stage turbocharger so as to achieve the aim of the optimal dynamic property and the fuel economy of the engine.

Another embodiment of the present invention provides a turbocharger system, which further comprises an actuator, and the actuator is in driving connection with one end of the valve shaft.

By adopting the technical scheme, the actuator is used for providing driving torque for the outer rocker arm of the waste gas bypass valve, the torque is transmitted to the valve shaft through the outer rocker arm, and the valve body is driven by the valve shaft to rotate, so that the position opening of the valve body can be adjusted between opening and closing relative to the second gas channel.

The utility model has the beneficial effects that:

the waste gate valve provided by the utility model comprises a valve casing and a valve body assembly, wherein a first gas passage and a second gas passage are arranged on the valve casing, the cross section size of the second gas passage is larger than that of the first gas passage, and the first gas passage and the second gas passage penetrate through the valve casing along the thickness direction of the valve casing. The valve body assembly comprises a valve body, a valve shaft, an upper rocker arm and a lower rocker arm. The valve body is fixedly connected with the valve shaft, the upper rocker arm and the lower rocker arm are both sleeved on the outer wall surface of the valve shaft and are respectively positioned on two sides of the valve body, one side of the upper rocker arm and one side of the lower rocker arm are respectively and fixedly connected onto the valve shaft, and the other side of the upper rocker arm and the other side of the lower rocker arm are respectively and fixedly connected onto the valve body. The valve body is located in the second gas passage and is matched with the second gas passage, and the valve body can rotate relative to the second gas passage through the valve shaft, so that the valve body can adjust the position opening degree between opening and closing relative to the second gas passage. When the gas is not required to be bypassed, the valve body is in a closed state with respect to the second gas passage, and the gas entering the wastegate valve flows through the first gas passage. When gas needs to be bypassed, the valve body is in an open state with respect to the second gas passage, and gas entering the wastegate valve can flow through the first gas passage and the second gas passage. And when the valve body is at the maximum opening degree relative to the second gas channel, because the cross section of the second gas channel is larger than that of the first gas channel, and the blockage of the second gas channel to the gas is small, the gas only flows in the second gas channel, thereby ensuring that the gas flowing into the waste gas bypass valve is completely bypassed. During the installation, only need with this wastegate valve install to need by the bypass on the pipeline connecting end can, need not to set up the bypass pipe for the bypass valve alone, consequently, compare in the bypass valve that needs set up the bypass pipe alone, this wastegate valve's wholeness is higher, and arranges simplyr. Simultaneously, because the valve body and the second gas passage's of valve casing cooperation for this waste gate valve has the advantage that sealing performance is good and the response is fast.

Additional features and corresponding advantages of the utility model are set forth in the description which follows, and it is understood that at least some of the advantages will be apparent from the description of the utility model.

Drawings

Fig. 1 is an overall configuration diagram of a wastegate valve provided in embodiment 1 of the present invention;

FIG. 2 is a cross-sectional view of the wastegate valve of FIG. 1 in the direction A-A;

FIG. 3 is a cross-sectional view of the wastegate valve of FIG. 1 in the direction B-B;

FIG. 4 is a simplified schematic diagram of a wastegate valve provided in embodiment 1 of the present invention;

FIG. 5 is a partial schematic structural view of a wastegate valve provided in embodiment 1 of the present invention;

fig. 6 is an exploded view of a valve body assembly of a wastegate valve provided in embodiment 1 of the present invention;

fig. 7 is a schematic structural view of a turbocharger provided in embodiment 2 of the utility model;

fig. 8 is a schematic structural diagram of a turbocharger system according to embodiment 3 of the present invention.

Description of reference numerals:

10: a valve housing;

101: a first gas passage;

102: a second gas passage; 1021: a shaft hole; 1021 a: a first recess; 1021 b: a second recess; 1022: a first valve seat; 1023: a second valve seat; 1024: a first stop surface; 1025: a second stop surface; 1026: a first transition surface; 1027: a second transition surface;

103: a spacing pin;

20: a valve body assembly;

201: a valve body; 2011: a second fixed part;

202: a valve shaft; 2021: a valve body groove; 2022: sealing the ring groove; 2023: a collar; 2024: a first fixed part;

203: an upper rocker arm; 2031: a body; 2031 a: a first fixed part; 2032: a supporting block; 2032 a: a second fixed part; 2032 b: a hole portion;

204: a lower rocker arm; 2041: a body; 2041 a: a first fixed part; 2042: a support block; 2042 a: a second fixed part; 2042 b: a hole portion;

205: a first bushing; 2051: a first positioning ring;

206: a second shaft sleeve; 2061: a second positioning ring;

207: a seal ring;

208: a disc spring;

209: an outer rocker arm; 2091: a limiting bump;

210: an elastic pad;

211: a bowl-shaped plug;

212: a connecting pin;

30: and an actuator.

Detailed Description

The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure. While the utility model will be described in conjunction with the preferred embodiments, it is not intended that the features of the utility model be limited to these embodiments. On the contrary, the intention of the novel description to be incorporated into the embodiments is to cover alternatives or modifications which may be extended in accordance with the appended claims. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The utility model may be practiced without these particulars. Moreover, some of the specific details have been left out of the description in order to avoid obscuring or obscuring the focus of the present invention. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.

It should be noted that in this specification, like reference numerals and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that are conventionally arranged when the products of the present invention are used, and are only used for convenience in describing and simplifying the description, but do not indicate or imply that the devices or elements indicated must have specific orientations, be constructed in specific orientations, and operated, and thus, should not be construed as limiting the present invention.

The terms "first," "second," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

In the description of the present embodiment, it should also be noted that, unless explicitly stated or limited otherwise, the terms "disposed," "connected," and "connected" are to be construed broadly, and may for example be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present embodiment can be understood in specific cases by those of ordinary skill in the art.

In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Example 1

The present embodiment provides a wastegate valve, as shown in fig. 1 and 2, comprising a valve housing 10 and a valve body assembly 20, wherein the valve housing 10 is provided with a first gas passage 101 and a second gas passage 102, the cross-sectional dimension of the second gas passage 102 is larger than that of the first gas passage 101, and both the first gas passage 101 and the second gas passage 102 penetrate the valve housing 10 in the thickness direction of the valve housing 10.

The valve body assembly 20 includes a valve body 201, a valve shaft 202, an upper rocker arm 203, and a lower rocker arm 204. The valve body 201 is fixedly connected with the valve shaft 202, the upper rocker arm 203 and the lower rocker arm 204 are sleeved on the outer wall surface of the valve shaft 202 and are respectively located on two sides of the valve body 201, one side of the upper rocker arm 203 and one side of the lower rocker arm 204 are respectively and fixedly connected to the valve shaft 202, and the other side of the upper rocker arm 203 and the other side of the lower rocker arm 204 are respectively and fixedly connected to the valve body 201. The valve body 201 is located in the second gas passage 102 and fitted to the second gas passage 102, and the valve body 201 is rotatable relative to the second gas passage 102 by the valve shaft 202 so that the valve body 201 can adjust the position opening between open and closed relative to the second gas passage 102. When the valve body 201 is in an open state with respect to the second gas passage 102, gas can flow at least through the second gas passage 102; when the valve body 201 is in a closed state with respect to the second gas passage 102, gas can flow only through the first gas passage 101.

Specifically, end surfaces of both ends of the valve housing 10 in the thickness direction of the valve housing 10 are provided as planes parallel to each other to facilitate connection and sealing of the end surfaces of the valve housing 10 with planes of other parts.

More specifically, the cross-sections of the first gas passage 101 and the second gas passage 102 may be provided in a rectangular shape, a circular shape, a triangular shape, or the like, and accordingly, the shape of the valve body 201 is also provided in a shape that fits the second gas passage 102. Preferably, in order to ensure the sealing performance of the wastegate valve and facilitate the manufacturing of the wastegate valve, the cross sections of the first gas passage 101 and the second gas passage 102 in this embodiment are configured to be semicircular and circular, and the shape of the valve body 201 is also configured to be a disk shape that fits the second gas passage 102.

More specifically, the diameter size of the cross section of the second gas channel 102 may be 5mm, 10mm, 15mm, 20mm, etc. larger than the equivalent diameter size of the cross section of the first gas channel 101, which may be set according to actual design and use requirements, and this embodiment is not limited thereto.

More specifically, one side of the upper rocker arm 203 and one side of the lower rocker arm 204 may be fixedly connected to the valve shaft 202 by welding, screwing, riveting, or the like, and the other side of the upper rocker arm 203 and the other side of the lower rocker arm 204 may be fixedly connected to the valve body 201 by welding, screwing, riveting, or the like, respectively. The specific configuration may be set according to actual design and use requirements, and this embodiment does not specifically limit this.

More specifically, a sealing member may be provided between the valve body 201 and the second gas passage 102 to improve the sealing performance between the valve body 201 and the second gas passage 102.

When the gas does not need to be bypassed, the valve body 201 is in a closed state with respect to the second gas passage 102, and the gas entering the wastegate valve flows through the first gas passage 101. When the gas needs to be bypassed, the valve body 201 is in an open state with respect to the second gas passage 102, and the gas entering the wastegate valve can flow through the first gas passage 101 and the second gas passage 102. Also, when the valve body 201 is at the maximum opening degree with respect to the second gas passage 102, since the cross section of the second gas passage 102 is larger than that of the first gas passage 101 and the blockage of the gas by the second gas passage 102 is small, the gas mainly flows in the second gas passage 102, thereby ensuring that most of the gas flowing into the wastegate valve is bypassed. During the installation, only need with this waste gate valve install to need by the bypass in the pipeline can, need not to set up the bypass pipe alone for the bypass valve, consequently, compare in the bypass valve that needs set up the bypass pipe alone, this waste gate valve's wholeness is higher, and arranges simplyr. Meanwhile, due to the cooperation of the valve body 201 and the second gas passage 102 of the valve housing 10, the wastegate valve has the advantages of good sealing performance and fast response.

Further, the present embodiment also provides a wastegate valve, as shown in fig. 2 and 3, two shaft holes 1021 are provided on the inner side wall of the second air passage 102 of the valve housing 10, and both ends of the valve shaft 202 are rotatably connected to the second air passage 102 through a first sleeve 205 and a second sleeve 206 fastened to the shaft holes 1021, respectively. The two shaft holes 1021 extend through the valve housing 10 in the axial direction of the valve shaft 202. The valve shaft 202 is provided with a valve body groove 2021, and the valve body groove 2021 penetrates through the valve shaft 202 along a direction perpendicular to the valve shaft 202; the valve body 201 is fitted to the valve shaft 202 through the valve body groove 2021.

Specifically, the two ends of the valve shaft 202 are in clearance fit with the first shaft sleeve 205 and the second shaft sleeve 206 respectively, and the first shaft sleeve 205 and the second shaft sleeve 206 are in interference fit with the shaft hole 1021 on the second gas passage 102 respectively, so as to prevent the valve shaft 202 from being stuck with the first shaft sleeve 205 and the second shaft sleeve 206 during the rotation process, or prevent the first shaft sleeve 205 and the second shaft sleeve 206 from slipping with the shaft hole 1021. The valve body groove 2021 is in clearance fit with the valve body 201 to facilitate a small range of relative movement of the valve body 201 with respect to the valve shaft 202, thereby enabling the valve body 201 to better engage with the second gas passage 102 of the valve housing 10 to increase the sealing adjustability between the valve body 201 and the second gas passage 102 of the valve housing 10.

It should be noted that, compared to providing a hinge or other means for rotational connection, two shaft holes 1021 are directly provided on the inner sidewall of the second air passage 102 of the valve housing 10, so that the two ends of the valve shaft 202 are respectively rotatably connected to the second air passage 102 through two first bushings 205 and second bushings 206 fastened in the shaft holes 1021, which enables the structure of the valve body assembly 20 to be simpler and the operation to be faster. Further, in addition to the connection between the valve body 201 and the valve shaft 202 by the upper rocker arm 203 and the lower rocker arm 204, the valve body 201 is fitted to the valve shaft 202 through the valve body groove 2021, and the stability of the connection between the valve body 201 and the valve shaft 202 can be further increased.

Further, as shown in fig. 1 and fig. 2, the present embodiment further provides a wastegate valve, wherein a first valve seat 1022 and a second valve seat 1023 protruding along the circumferential direction of the second gas passage 102 are respectively disposed on the inner side wall of the second gas passage 102, one end of the first valve seat 1022 extends to one end of the second gas passage 102, the other end of the first valve seat transitions to the inner wall surface of the second gas passage 102 to form a first stop surface 1024, one end of the second valve seat 1023 extends to the other end of the second gas passage 102, and the other end of the second valve seat transitions to the inner wall surface of the second gas passage 102 to form a second stop surface 1025. The first and second stop surfaces 1024 and 1025 can stop the valve body 201, and in the circumferential direction of the second gas channel 102, two ends of the first stop surface 1024 and two ends of the second stop surface 1025 extend obliquely, respectively, and two ends of the first stop surface 1024 and two ends of the second stop surface 1025 are in transition connection to form a first transition surface 1026 and a second transition surface 1027. The two axial holes 1021 are respectively disposed between the first transition surface 1026 and the second gas channel 102 and between the second transition surface 1027 and the second gas channel 102.

Specifically, the dimension between the first valve seat 1022 and the second valve seat 1023 provided on the second gas passage 102 is smaller than the diameter dimension of the valve body 201, so that the valve body 201 can rotate only in the area of the second gas passage 102 where the first valve seat 1022 and the second valve seat 1023 are not provided. When the valve body 201 is in a closed state with respect to the second gas passage 102, the periphery of the valve body 201 abuts on the first stop surface 1024 and the second stop surface 1025, so that the valve body 201 is in a sealed state with respect to the second gas passage 102; when the valve body 201 is in an open state with respect to the second gas passage 102, the positions of the valve body 201 with respect to the first and second stop surfaces 1024 and 1025 are different, so that the opening degree of the valve body 201 with respect to the second gas passage 102 is different.

More specifically, the specific arrangement positions of first stop surface 1024 and second stop surface 1025 can be set according to actual design and use requirements, and preferably, as shown in fig. 4, the arrangement positions of first stop surface 1024 and second stop surface 1025 in this embodiment are: when the valve body 201 is in a closed state with respect to the second gas passage 102, the normal direction of the plane of the valve body 201 is inclined by 15 ° with respect to the axis of the passage formed by the face of the first valve seat 1022 and the face of the second valve seat 1023; when the valve body 201 is at the maximum opening degree with respect to the second gas passage 102, the normal direction of the plane of the valve body 201 is 90 ° with respect to the axis of the passage formed by the surfaces of the first valve seat 1022 and the second valve seat 1023. Therefore, the good 75-degree working range of the butterfly valve can be fully utilized, and the control precision of the waste gas bypass valve is improved.

More specifically, due to the positions of the surfaces of the first valve seat 1022 and the second valve seat 1023, the center of rotation of the valve body 201 is eccentrically disposed with respect to the axis of the passage formed by the surfaces of the first valve seat 1022 and the second valve seat 1023. The two shaft holes 1021 are respectively arranged between the first transition surface 1026 and the second gas passage 102 and between the second transition surface 1027 and the second gas passage 102, so that a gap between the first transition surface 1026 and the second transition surface 1027 and the valve body 201 can be avoided.

When the valve body 201 is in the closed state with respect to the second gas passage 102, the first valve seat 1022 and the second valve seat 1023 are fitted to the valve body 201, whereby the sealing performance of the wastegate valve can be further improved. The positions of the first stop surface 1024 and the second stop surface 1025 can control the position of the valve body 201 in the closed state to ensure that the sealing surface of the abutting surface is uniformly pressed when the valve body is closed.

Further, the present embodiment also provides a wastegate valve, as shown in fig. 2 and 3, the valve body assembly 20 further includes a first bushing 205 and a second bushing 206. The first shaft sleeve 205 and the second shaft sleeve 206 are respectively disposed in the two shaft holes 1021, and a first positioning ring 2051 protruding in the circumferential direction of the first shaft sleeve 205 is disposed at one end of the first shaft sleeve 205 located on the outer side wall of the valve housing 10, and a second positioning ring 2061 protruding in the circumferential direction of the second shaft sleeve 206 is disposed at one end of the second shaft sleeve 206 close to the outer side wall of the valve housing 10. The inner side walls of the two shaft holes 1021 are provided with a first concave portion 1021a and a second concave portion 1021b at positions corresponding to the first positioning ring 2051 and the second positioning ring 2061, the first positioning ring 2051 is matched with the first concave portion 1021a, and the second positioning ring 2061 is matched with the second concave portion 1021 b.

The outer wall surface of the valve shaft 202 is further provided with two collars 2023 spaced along the axial direction of the valve shaft 202, the two collars 2023 are respectively located at one end of the first bushing 205 away from the first positioning ring 2051 and one end of the second bushing 206 away from the second positioning ring 2061, and the two collars 2023 are respectively protruded along the circumferential direction of the valve shaft 202. The valve body groove 2021 extends to the two collars 2023 at both ends thereof.

Specifically, the first shaft sleeve 205 and the second shaft sleeve 206 are in interference fit with the two shaft holes 1021 respectively, and the first shaft sleeve 205 and the second shaft sleeve 206 are in clearance fit with two ends of the valve shaft 202 respectively, so that the first shaft sleeve 205 and the second shaft sleeve 206 can support two ends of the valve shaft 202, and the valve shaft 202 can rotate relative to the first shaft sleeve 205 and the second shaft sleeve 206, thereby ensuring that no clamping stagnation occurs during operation.

More specifically, since the shaft hole 1021 is disposed between the first transition surface 1026 and the second gas channel 102 and between the second transition surface 1027 and the second gas channel 102, the two ends of the valve body groove 2021 respectively extend to the two collars 2023, so as to ensure the sealing performance of the valve body 201 and the second gas channel 102 at the shaft hole 1021, and further ensure the sealing performance of the wastegate valve.

It should be noted that the provision of the first and second bushings 205, 206 ensures tightness and wear resistance of the connection of the valve shaft 202 to the valve housing 10. The first retaining ring 2051 and the first recess 1021a cooperate to ensure axial positioning of the first hub 205 relative to the valve shaft 202, and the second retaining ring 2061 and the second recess 1021b cooperate to ensure axial positioning of the second hub 206 relative to the valve shaft 202. The provision of the two collars 2023 ensures axial positioning of the valve shaft 202 relative to the two shaft holes 1021, while the provision of the two collars 2023 also enhances the strength of the valve shaft 202.

Further, the present embodiment further provides a wastegate valve, as shown in fig. 2 and fig. 3, the valve body assembly 20 further includes a sealing ring 207, and the valve shaft 202 is further provided with a sealing ring groove 2022. The seal ring groove 2022 is disposed on an outer side wall of an end of the valve shaft 202 extending into the first shaft sleeve 205, and the seal ring 207 is disposed in the seal ring groove 2022.

Specifically, the seal ring 207 is provided as a piston ring, and it may be specifically a high-temperature-resistant cemented carbide material.

More specifically, the sealing ring 207 is in clearance fit with the sealing ring groove 2022, and the sealing ring 207 slightly protrudes from the sealing ring groove 2022 and is expanded to abut against the inner wall surface of the first sleeve 205, so as to ensure the sealing performance of the wastegate valve.

It should be noted that, no matter the valve body 201 is in a closed state or an open state relative to the second gas passage 102, the arrangement of the seal ring groove 2022 and the seal ring 207 can prevent gas from leaking from the shaft hole 1021 of the valve housing 10 on which the first sleeve 205 is arranged, so as to improve the sealing performance of the wastegate valve and meet the requirement of environmental emission.

Further, the present embodiment further provides a waste gate valve, as shown in fig. 2, fig. 3 and fig. 5, the valve body assembly 20 further includes a disc spring 208, the upper rocker arm 203 includes a body 2031 and a supporting block 2032, a first fixing portion 2031a is disposed on a side wall of the body 2031, a first fixed portion 2024 is disposed on the valve shaft 202 at a position corresponding to the first fixing portion 2031a, and the first fixing portion 2031a and the first fixed portion 2024 are matched with each other, so that the body 2031 of the upper rocker arm 203 is fixedly connected to the valve shaft 202. The lower rocker arm 204 includes a body 2041 and a supporting block 2042, a first fixing portion 2041a is disposed on a side wall of the body 2041, a first fixed portion 2024 is disposed on the valve shaft 202 at a position corresponding to the first fixing portion 2041a, and the first fixing portion 2041a and the first fixed portion 2024 are matched with each other, so that the body 2041 of the lower rocker arm 204 is fixedly connected to the valve shaft 202.

One end of the supporting block 2032 of the upper rocker arm 203 is connected to the side wall of the body 2031, and the other end extends outward in the direction perpendicular to the valve shaft 202, and the supporting block 2032 is provided with a second fixing portion 2032a, and the valve body 201 is provided with a second fixed portion 2011 at a position corresponding to the second fixing portion 2032 a. The second fixing portion 2032a and the second fixed portion 2011 are engaged, so that the supporting block 2032 of the upper rocker arm 203 is fixedly connected to the valve body 201. A hole portion 2032b recessed inward is further provided on the side surface of the support block 2032 of the upper rocker arm 203 near the valve body 201, and a disc spring 208 is provided in the hole portion 2032 b.

One end of the supporting block 2042 of the lower rocker arm 204 is connected to the side wall of the body 2041, and the other end extends outward in the direction perpendicular to the valve shaft 202, and the supporting block 2042 is provided with a second fixing portion 2042a, and the valve body 201 is provided with a second fixed portion 2011 at a position corresponding to the second fixing portion 2042 a. The second fixing portion 2042a and the second fixed portion 2011 are engaged, so that the supporting block 2042 of the lower rocker arm 204 is fixedly connected to the valve body 201. A hole portion 2042b recessed inward is further provided on the side surface of the support block 2042 of the lower rocker arm 204 close to the valve body 201, and a disc spring 208 is provided in the hole portion 2042 b.

Specifically, the first fixing portion 2031a of the body 2031 of the upper rocker arm 203 and the first fixing portion 2041a of the body 2041 of the lower rocker arm 204 may be provided with a welding hole, a threaded hole, a staking hole, or the like, and accordingly, the first fixed portion 2024 may be provided with a welding hole, a threaded hole, a staking hole, or the like. The second fixing portion 2032a of the supporting block 2032 of the upper rocker arm 203 and the second fixing portion 2042a of the supporting block 2042 of the lower rocker arm 204 may be provided as a welding hole, a threaded hole, a riveting hole, or the like, and accordingly, the second fixed portion 2011 may be provided with a welding hole, a threaded hole, a riveting hole, or the like. The specific configuration may be set according to actual design and use requirements, and this embodiment does not specifically limit this.

More specifically, the disc spring 208 may be sized according to the sizes of the upper hole portion 2032b of the support block 2032 of the upper rocker arm 203 and the upper hole portion 2042b of the support block 2042 of the lower rocker arm 204. The specific configuration may be set according to actual design and use requirements, and this embodiment does not specifically limit this.

It should be noted that the first fixing portion 2031a of the body 2031 of the upper rocker arm 203 and the first fixed portion 2041a and the first fixed portion 2024 of the body 2041 of the lower rocker arm 204, and the second fixing portion 2032a of the supporting block 2032 of the upper rocker arm 203 and the second fixed portion 2042a and the second fixed portion 2011 of the supporting block 2042 of the lower rocker arm 204 are arranged to facilitate the mounting, dismounting and replacing of the valve body 201 and the valve shaft 202. The arrangement of the disc spring 208 in the hole portion 2032b of the support block 2032 of the upper rocker arm 203 and the hole portion 2042b of the support block 2042 of the lower rocker arm 204 enables the upper rocker arm 203 and the lower rocker arm 204 to be elastically connected with the valve body 201 respectively, the connection positioning of the upper rocker arm 203 or the lower rocker arm 204 with the valve body 201 and the disc spring 208 can be completed by the connecting pin 212, one end of the connecting pin 212 penetrating through a central hole of the disc spring 208 can be riveted or welded, the other end is designed to be a step-and-circle limit, the disc spring 208 in a mounting state is in a pre-compression state, the contact surface of the upper rocker arm 203 or the lower rocker arm 204 with the valve body 201 has a certain gap, the gap and the elastic force of the disc spring 208 are self-adjusted within a certain range under various working loads, further, the sealing surface pressure uniformity of the first stop surface 1024 and the second stop surface 1025 with the valve body 201 can be improved, and the abrasion between the upper rocker arm 203 and the lower rocker arm 204 with the valve body 201 can be reduced. Meanwhile, the arrangement of the disc spring 208 can also improve the contact uniformity between the upper rocker arm 203 and the lower rocker arm 204 and the valve body 201, so that the effects of noise reduction and vibration prevention are achieved, and the NVH (noise, vibration and harshness) performance of the waste gas bypass valve is improved.

Further, as shown in fig. 3 and fig. 6, the present embodiment further provides a wastegate valve, which further includes an outer rocker arm 209, an elastic pad 210, and a bowl-shaped plug 211, wherein one end of the outer rocker arm 209 is fixedly connected to one end of the valve shaft 202, which passes through the first bushing 205, and a limit protrusion 2091, which extends in a direction perpendicular to the valve shaft 202 and away from the outer rocker arm 209, is further disposed on one end of the outer rocker arm 209. The outer wall surface of the valve housing 10 is provided with a stopper pin 103, and the stopper projection 2091 and the stopper pin 103 can abut against each other. The resilient pad 210 is disposed between the outer rocker arm 209 and the first retaining ring 2051. The bowl-shaped plug 211 is provided at one end of the outer side wall of the valve housing 10 in the second concave portion 1021b of the shaft hole 1021 provided with the second boss 206.

Specifically, one end of the outer rocker arm 209 and one end of the valve shaft 202 passing through the first bushing 205 may be fixedly connected by welding, clipping, screwing, or the like. The specific configuration may be set according to actual design and use requirements, and this embodiment does not specifically limit this.

More specifically, the elastomeric pad 210, which is pre-compressed between the outer rocker arm 209 and the first retaining ring 2051, limits axial play of the valve shaft 202 and enhances the sealing between the first hub 205 and the valve shaft 202.

More specifically, the bowl-shaped plug 211 is in interference fit with the inner wall surface of the second concave portion 1021b of the shaft hole 1021 of the second sleeve 206, so as to ensure the sealing performance of the second concave portion 1021b of the shaft hole 1021 of the second sleeve 206 on the valve housing 10 and ensure that the exhaust gas is not leaked.

It should be noted that the valve shaft 202 is in transmission connection with the driving member through the outer rocker arm 209, so that the driving member can drive the valve body 201 through the outer rocker arm 209 and the valve shaft 202 to adjust the position opening degree between opening and closing with respect to the second gas passage 102. The limit pin 103 disposed on the outer wall surface of the valve housing 10 can abut against the limit protrusion 2091 disposed on the outer rocker arm 209 to prevent the valve shaft 202 from driving the valve body 201 to further rotate, that is, the position where the limit pin 103 abuts against the limit protrusion 2091 is the maximum opening of the valve body 201 relative to the second gas passage 102. The arrangement of the elastic cushion 210 between the outer rocker arm 209 and the first positioning ring 2051 enables the shaft collar 2023 to be attached to the first shaft sleeve 205, leakage of gas between the inner hole of the valve housing 10, in which the first shaft sleeve 205 is arranged, and the valve shaft 202 is further avoided, and leakage of gas between the inner hole of the valve housing 10, in which the second shaft sleeve 206 is arranged, and the valve shaft 202 is avoided due to the arrangement of the bowl-shaped plug 211, so that the sealing performance of the waste gate valve is further improved.

Example 2

The present embodiment provides a turbocharger as shown in fig. 7, and the turbocharger includes the wastegate valve of embodiment 1.

It should be noted that the turbocharger is different from the turbocharger in the prior art in that the wastegate valve of the turbocharger is provided at the exhaust gas outlet end of the turbine case of the turbocharger in the prior art, and the turbine flow passage and the bypass flow passage are each independently arranged inside the turbine case until two independent outlet passages are output, and the cross section of the bypass flow passage is larger than that of the turbine flow passage, whereby the wastegate valve of the turbocharger will have a larger exhaust gas bypass capability. Therefore, compared with the turbocharger which is provided with a bypass pipe for bypassing exhaust gas with a large flow rate and separately providing the bypass valve for the bypass valve in the prior art, the turbocharger in the embodiment only needs to mount the exhaust gas bypass valve to the pipeline connecting end which needs to be bypassed through a sealing gasket and a fastening piece, and does not need to separately provide the bypass pipe for the bypass valve, at the moment, the turbine runner corresponds to the first gas channel 101, and the bypass runner corresponds to the second gas channel 102. Therefore, the waste gate valve of the turbocharger has simpler structure, quicker action and better integrity. In addition, since the elastic member and the sealing member are provided between the valve body assembly 20 and the valve housing 10 of the wastegate valve of the turbocharger, the turbocharger has advantages of high NVH performance and good sealing performance.

Example 3

The present embodiment provides a turbocharger system, as shown in fig. 8, which includes a low-pressure stage turbocharger and a high-pressure stage turbocharger, a turbine casing of the high-pressure stage turbocharger and a turbine casing of the low-pressure stage turbocharger being communicated with each other, and at least the high-pressure stage turbocharger being provided as the turbocharger in embodiment 2.

Specifically, the low-pressure stage turbocharger may be provided as a turbocharger larger than that in embodiment 2, or may be provided as a turbocharger of another structure compatible with the high-pressure stage turbocharger.

More specifically, the turbine box of the high-pressure stage turbocharger and the turbine box of the low-pressure stage turbocharger are communicated through the waste gate valve, and the waste gate valve and the turbine box of the high-pressure stage turbocharger and the turbine box of the low-pressure stage turbocharger can be connected in a fixed connection mode through screwing, riveting, welding and the like, and the waste gate valve can be set according to actual design and use requirements. In the embodiment, the waste gas bypass valve is fixedly connected with a turbine box of a high-pressure stage turbocharger and a turbine box of a low-pressure stage turbocharger through double studs and nuts.

More specifically, a plurality of stud holes are provided around the valve housing 10 of the wastegate valve, and each stud hole is provided with a stud bolt so as to be screwed with the turbine case of the high-pressure stage turbocharger and the turbine case of the low-pressure stage turbocharger.

More specifically, the number of the stud holes provided on the peripheral side of the valve housing 10 of the wastegate valve may be 2, 3, 4, 5, or the like. The specific configuration may be set according to actual design and use requirements, and this embodiment does not specifically limit this.

More specifically, a sealing gasket is arranged between the waste gas bypass valve and the turbine box of the high-pressure stage turbocharger and the turbine box of the low-pressure stage turbocharger, so that gas leakage at the connecting surface is avoided, and the sealing performance of the turbocharging system is improved.

It should be noted that the gas is transferred from the first gas passage 101 or the second gas passage 102 of the high-pressure stage turbocharger to the low-pressure stage turbocharger. When the opening degree of the valve body 201 of the high-pressure stage turbocharger with respect to the second gas passage 102 is large, since the cross section of the second gas passage 102 is larger than the cross section of the first gas passage 101, and the flow resistance at the first gas passage 101 of the high-pressure stage turbocharger is large, most of the gas flows into the low-pressure stage turbocharger from the second gas passage 102 of the high-pressure stage turbocharger. When the opening degree of the valve body 201 of the high-pressure stage turbocharger with respect to the second gas passage 102 is small, most of the gas flows from the first gas passage 101 of the high-pressure stage turbocharger into the low-pressure stage turbocharger. Therefore, the turbocharging system can properly adjust the distribution of the gas flow passing through the first gas passage 101 and the second gas passage 102 of the high-pressure stage turbocharger by controlling the opening degree of the valve body 201 of the waste gas bypass valve of the high-pressure stage turbocharger relative to the opening degree of the second gas passage 102, and further reasonably distribute the working loads of the high-pressure stage turbocharger and the low-pressure stage turbocharger so as to achieve the aims of optimal dynamic property and fuel economy of the engine.

Further, the present embodiment also provides a turbocharging system, the turbocharging system further comprises an actuator 30, and the actuator 30 is in transmission connection with one end of the valve shaft 202.

It should be noted that the actuator 30 is configured to provide a driving torque to an outer rocker arm 209 of the wastegate valve, and transmit the driving torque to the valve shaft 202 through the outer rocker arm 209, and the valve body 201 is driven by the valve shaft 202 to rotate, so that the valve body 201 can adjust the position opening between the opening and the closing with respect to the second gas passage 102.

While the utility model has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those skilled in the art that the foregoing is a more detailed description of the utility model, taken in conjunction with the specific embodiments thereof, and that no limitation of the utility model is intended thereby. Various changes in form and detail, including simple deductions or substitutions, may be made by those skilled in the art without departing from the spirit and scope of the utility model.

Claims (10)

1. A wastegate valve comprising a valve housing and a valve body assembly, wherein the valve housing is provided with a first gas passage and a second gas passage, the second gas passage has a larger cross-sectional size than the first gas passage, and both the first gas passage and the second gas passage extend through the valve housing in a thickness direction of the valve housing;

the valve body assembly comprises a valve body, a valve shaft, an upper rocker arm and a lower rocker arm; the valve body is fixedly connected with the valve shaft, the upper rocker arm and the lower rocker arm are sleeved on the outer wall surface of the valve shaft and are respectively positioned on two sides of the valve body, one side of the upper rocker arm and one side of the lower rocker arm are respectively and fixedly connected to the valve shaft, and the other side of the upper rocker arm and the other side of the lower rocker arm are respectively and fixedly connected to the valve body; the valve body is positioned in the second gas passage and matched with the second gas passage, and the valve body can rotate relative to the second gas passage through the valve shaft, so that the valve body can adjust the position opening degree between opening and closing relative to the second gas passage;

when the valve body is in an open state relative to the second gas passage, gas can flow at least through the second gas passage;

when the valve body is in a closed state relative to the second gas passage, gas can only flow through the first gas passage.

2. A wastegate valve as claimed in claim 1, wherein two axial holes are provided in the inner side wall of said second gas passage of said valve housing, and both ends of said valve shaft are rotatably connected to said second gas passage through said two axial holes, respectively; the two shaft holes are respectively penetrated through the valve shell along the axial direction of the valve shaft;

the valve shaft is provided with a valve body groove, and the valve body groove penetrates through the valve shaft along a direction perpendicular to the valve shaft; and, the valve body is embedded on the valve shaft through the valve body groove.

3. The wastegate valve according to claim 2, wherein the inner side wall of the second gas passage is provided with a first valve seat and a second valve seat which are protrudingly provided in the circumferential direction of the second gas passage, respectively, and one end of the first valve seat extends to one end of the second gas passage and the other end thereof transits to the inner wall surface of the second gas passage to form a first stop surface, one end of the second valve seat extends to the other end of the second gas passage and the other end thereof transits to the inner wall surface of the second gas passage to form a second stop surface; the first stop surface and the second stop surface can stop the valve body, two ends of the first stop surface and two ends of the second stop surface respectively extend obliquely along the circumferential direction of the second gas channel, and two ends of the first stop surface are in transitional connection with two ends of the second stop surface to form a first transition surface and a second transition surface; the two shaft holes are respectively arranged between the first transition surface and the second gas channel and between the second transition surface and the second gas channel.

4. A wastegate valve as in claim 3 wherein said valve body assembly further comprises a first bushing and a second bushing; the first shaft sleeve and the second shaft sleeve are respectively arranged in the two shaft holes, a first positioning ring which is arranged in a protruding mode along the circumferential direction of the first shaft sleeve is arranged at one end, located on the outer side wall of the valve shell, of the first shaft sleeve, and a second positioning ring which is arranged in a protruding mode along the circumferential direction of the second shaft sleeve is arranged at one end, close to the outer side wall of the valve shell, of the second shaft sleeve;

a first concave part and a second concave part are respectively arranged at positions corresponding to the first positioning ring and the second positioning ring on the inner side walls of the two shaft holes, the first positioning ring is matched with the first concave part, and the second positioning ring is matched with the second concave part;

the outer wall surface of the valve shaft is also provided with two collars which are arranged at intervals along the axial direction of the valve shaft, the two collars are respectively positioned at one end of the first collar, which is far away from the first positioning ring, and one end of the second collar, which is far away from the second positioning ring, and the two collars are respectively arranged in a protruding way along the circumferential direction of the valve shaft; and two ends of the valve body groove respectively extend to the two collars.

5. The wastegate valve of claim 4, wherein said valve body assembly further includes a seal ring, said valve shaft further having a seal ring groove; the seal ring groove set up in the valve shaft stretches into on the lateral wall of the one end of first axle sleeve, just the seal ring set up in the seal ring groove.

6. The wastegate valve of claim 5, wherein the valve body assembly further comprises a disc spring, the upper rocker arm and the lower rocker arm comprise a body and a support block, respectively, a first fixing portion is disposed on a side wall of the body, a first fixed portion is disposed on the valve shaft at a position corresponding to the first fixing portion, and the first fixing portion and the first fixed portion cooperate such that the body of the upper rocker arm and the body of the lower rocker arm are both fixedly connected to the valve shaft;

one end of each of the supporting blocks of the upper rocker arm and the supporting block of the lower rocker arm is connected with the corresponding side wall of the body, the other end of each of the supporting blocks of the upper rocker arm and the supporting block of the lower rocker arm extends outwards along the direction perpendicular to the valve shaft, a second fixing part is arranged on each supporting block, and a second fixed part is arranged at the position, corresponding to the second fixing part, on the valve body; the second fixed part is matched with the second fixed part, so that the supporting block of the upper rocker arm and the supporting block of the lower rocker arm are fixedly connected to the valve body;

the supporting block is provided with a hole part which is sunken inwards on the side surface close to the valve body, and the disc spring is arranged in the hole part.

7. The wastegate valve of claim 6, further comprising an outer rocker arm, an elastic pad, and a bowl-shaped plug, wherein one end of the outer rocker arm is fixedly connected to one end of the valve shaft passing through the first boss, and a limit projection extending in a direction perpendicular to the valve shaft in a direction away from the outer rocker arm is further provided on the one end of the outer rocker arm; a limiting pin is arranged on the outer wall surface of the valve shell, and the limiting lug and the limiting pin can be mutually abutted;

the elastic pad is arranged between the outer rocker arm and the first positioning ring; the bowl-shaped plug is arranged on the shaft hole provided with the second shaft sleeve and is positioned at one end of the outer side wall of the valve casing.

8. A turbocharger comprising a wastegate valve as claimed in any one of claims 1 to 7.

9. A turbocharging system, characterized in that it comprises a low-pressure stage turbocharger and a high-pressure stage turbocharger, the turbine casing of which is in communication with the turbine casing of the low-pressure stage turbocharger, and at least said high-pressure stage turbocharger is provided as a turbocharger according to claim 8.

10. The turbocharging system of claim 9, further comprising an actuator, wherein said actuator is drivingly connected to one end of said valve shaft.

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