Structure for improving air leakage at clearance of lining of turbine box of supercharger

Abstract

A structure for improving air leakage at a lining gap of a supercharger turbine box comprises the turbine box, an air valve is arranged in the turbine box, and an air bleeding crank is connected to the air valve; a through hole is formed in the turbine box, a lining is arranged in the through hole, and the deflation crank penetrates out of the lining and is connected to the rocker arm component. The inner end face of the lining retracts into the through hole, the deflation crank is provided with a boss, the boss is located at the position, where the lining retracts, in the through hole, and the surface of the boss abuts against the inner end face of the lining for sealing. The utility model provides the structure for improving the air leakage at the clearance of the bushing of the turbine box of the supercharger, the structure is simple, the cost is low, the generation of the clearance between the deflation crank and the bushing can be well avoided through the small change of the existing structure, and the air leakage under the specific working condition is effectively improved. The structure of the existing moving part is slightly changed, and the later maintenance cost is low.

Description

Technical Field

[0001] The utility model belongs to the technical field of turbocharger structures, and in particular relates to a structure for improving the air leakage at the gap of a turbine case bushing of a turbocharger. Background Art

[0002] A turbocharger is a common supercharging device that increases the intake volume and output power of an engine by utilizing the power of exhaust gas. Superchargers play an important role in improving engine performance and combustion efficiency, and are widely used in automobiles and other internal combustion engine-driven equipment.

[0003] As national emission regulations further enhance the requirements for diesel engine pollutant control, superchargers have become essential performance and emission components for diesel vehicles. At the same time, exhaust brake devices are also widely used in medium and large diesel vehicles. The exhaust brake device generates an air resistance pressure of about 4 to 5 absolute atmospheric pressure values ​​on the engine exhaust stroke by closing the internal butterfly valve, and the braking force of the whole vehicle is obtained by using the generated air resistance pressure. Inside the entire sealed exhaust pipeline, high-temperature and high-pressure gas can easily be depressurized through the clearance between the exhaust crank and the bushing in the turbocharger turbine box.

[0004] During the use of the vehicle, the reciprocating action of the bleed crank easily causes the axial and radial clearances between the bleed crank and the bushing to change. Under a specific clearance size, the high-temperature and high-pressure gas produces a sharp bleed sound during the leakage process. The sharp bleed sound gives the vehicle user a false impression of component failure, which easily causes panic and complaints from the vehicle user.

[0005] Based on the above problems in the prior art, the present application provides a structure for improving the air leakage at the gap of the turbine case bushing of a supercharger. Utility Model Content

[0006] In view of the deficiencies in the above-mentioned prior art, the utility model provides a structure for improving the gas leakage at the gap of the supercharger turbine case bushing. The structure is simple and the cost is low. By making small changes to the existing structure, the generation of a gap between the bleed crank and the bushing can be well avoided, thereby effectively improving gas leakage under specific working conditions.

[0007] The utility model solves the problem through the following technical solutions.

[0008] A structure for improving the air leakage at the gap of the bushing of a supercharger turbine case comprises a turbine case, an air valve is provided inside the turbine case, and a bleed crank is connected to the air valve; a through hole is provided on the turbine case, a bushing is provided in the through hole, and the bleed crank passes through the bushing and is connected to a rocker arm component; the inner end surface of the bushing is retracted in the through hole, and a boss is provided on the bleed crank, the boss is located at the position where the bushing is retracted in the through hole, and the surface of the boss abuts against the inner end surface of the bushing for sealing.

[0009] In the prior art, in the turbocharger turbine case structure, the reciprocating action of the bleed crank easily causes the axial and radial matching clearances between the bleed crank and the bushing to change, and the high-temperature and high-pressure gas leaking from the clearance will produce a sharp bleed sound, which easily causes panic and complaints from vehicle users. In the present application, based on the existing matching structure of the bleed crank and the bushing in the turbocharger turbine case, the matching structural positions of the turbine case, the bushing and the bleed crank are optimized and adjusted, and the matching sealing surface of the bleed crank and the bushing is hidden inside the bushing hole of the turbine case while ensuring that the bleed crank can work well, so as to increase the movement distance of the exhaust gas leakage and reduce the leakage of the high-temperature and high-pressure gas at the matching surface of the bleed crank and the bushing. At the same time, by utilizing the gas pressure difference between the inside and outside of the turbine case, a gas force F pointing to the outside of the turbine case is generated on the bleed crank inside the turbine case, so that the bleed crank and the bushing are clamped on the mating end faces inside the turbine case, thereby improving the sealing of the mating surfaces of the two and reducing the leakage of high-temperature and high-pressure gas here, thereby reducing the probability of sharp deflation sounds and the deposition of black carbon smoke on the surface of the rocker arm components, thereby improving user satisfaction. At the same time, this structure has the advantage of less changes to the existing moving parts structure and low subsequent maintenance costs.

[0010] In a preferred embodiment, the bushing is assembled in the through hole with an interference fit, and the deflation crank passes through the bushing and is rotatable.

[0011] In a preferred embodiment, the length of the through hole is L, the length of the inner end surface of the bushing retracted in the through hole is L2, and the length of the outer end surface of the bushing protruding from the through hole is L3; L2: L=0.1~0.15, L3: L=0.1~0.2, the structure is stable and the strength is high.

[0012] In a preferred embodiment, the boss is an annular boss provided on the outer circumference of the deflation crank.

[0013] Compared with the prior art, the utility model has the following beneficial effects: it provides a structure for improving the gas leakage at the gap of the supercharger turbine box bushing, which has a simple structure and low cost. By making small changes to the existing structure, it can well avoid the generation of a gap between the bleed crank and the bushing, and effectively improve the gas leakage under specific working conditions. At the same time, the structure in the present application has few changes to the existing moving parts structure, and has the advantage of low subsequent maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 Schematic diagram of the working state of the turbocharger.

[0015] Figure 2 It is a schematic diagram of the bushing structure in the turbine case in the prior art.

[0016] Figure 3 It is a schematic diagram of the bushing structure in the turbine case in this application.

[0017] Figure 4 for Figure 3 Magnified view of area A. DETAILED DESCRIPTION

[0018] The utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0019] In the following embodiments, the same or similar numbers throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0020] In the description of the present utility model, it should be understood that the terms: center, longitudinal, transverse, length, width, thickness, up, down, front, back, left, right, vertical, horizontal, top, bottom, inside, outside, clockwise, counterclockwise, etc. indicating the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present utility model and simplifying the description, and therefore cannot be understood as limiting the present utility model. In addition, the terms: first, second, etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features shown. In the description of the present utility model, unless otherwise clearly specified and limited, the terms: install, connect, connect, etc. should be understood in a broad sense, and ordinary technicians in this field can understand the specific meanings of the above terms in this application according to the specific circumstances.

[0021] See also Figure 1 , which is a schematic diagram of the working state of the turbocharger. It can be seen from the figure that one end of the exhaust pipe 4 is connected to the exhaust brake valve 5, and the other end is connected to the turbine end 3 of the turbocharger 1, and the other end of the turbocharger 1 is connected to the compressor end 2. Figure 2 , is a schematic diagram of the structure of the turbine box 6 and the structure thereon in the prior art. Figure 2 It can be seen that the bushing 64 is arranged in the through hole 63, and the bleed crank 62 passes through the bushing 64. During long-term use, due to the movement of the bleed crank 62, a gap will be generated between the bleed crank 62 and the bushing 64, and the high-pressure gas will leak from the gap, which will also produce a sharp sound.

[0022] Specifically, the exhaust brake device generates an air resistance pressure of about 4 to 5 absolute atmospheric pressure values ​​on the exhaust stroke of the engine by closing the internal butterfly valve, and the braking force of the whole vehicle is obtained by using the generated air resistance pressure. Inside the entire sealed exhaust pipeline, the high-temperature and high-pressure gas can easily be depressurized through the clearance between the exhaust crank and the bushing in the turbocharger turbine box. During the use of the whole vehicle, the reciprocating motion of the exhaust crank can easily cause the axial and radial clearance between the exhaust crank and the bushing to change. Under a specific gap size, the high-temperature and high-pressure gas produces a sharp deflation sound during the leakage process, and produces black carbon smoke on the surface of the rocker arm component. The sharp deflation sound and the black carbon smoke deposited on the surface of the rocker arm component give the users of the whole vehicle a false impression of component failure, which can easily cause panic and complaints from the users of the whole vehicle.

[0023] See also Figure 3 and Figure 4 The present application relates to a structure for improving the air leakage at the gap of the bushing of a supercharger turbine case, comprising a turbine case 6, wherein an air valve 61 is provided inside the turbine case 6, and a bleed crank 62 is connected to the air valve 61; a through hole 63 is provided on the turbine case 6, and a bushing 64 is provided in the through hole 63, and the bleed crank 62 passes through the bushing 64 and is connected to a rocker arm component 7; the inner end surface of the bushing 64 is retracted into the through hole 63, and a boss 621 is provided on the bleed crank 62, and the boss 621 is located at the position where the bushing 64 is retracted in the through hole 63, and the surface of the boss 621 abuts against the inner end surface of the bushing 64 for sealing.

[0024] Specifically, in the present application, the bushing 64 is assembled in the through hole 63 by interference fit, and the deflating crank 62 passes through the bushing 64 and is rotatable. The length of the through hole 63 is L, the length of the inner end face of the bushing 64 retracted in the through hole 63 is L2, and the length of the outer end face of the bushing 64 protruding from the through hole 63 is L3; L2: L=0.1~0.15, L3: L=0.1~0.2, the structure is stable and has high strength.

[0025] In the embodiment of the present application, the boss 621 is an annular boss provided on the outer circumference of the deflation crank 62 .

[0026] In the present application, on the basis of the existing matching structure of the bleed crank 62 and the bushing 64 in the turbine case of the supercharger, the matching structure positions of the turbine case, the bushing and the bleed crank are optimized and adjusted, and the matching sealing surface of the bleed crank and the bushing is hidden inside the bushing hole of the turbine case under the premise of ensuring that the bleed crank can work well, so as to increase the movement distance of the exhaust gas leakage, and reduce the leakage of high-temperature and high-pressure gas at the matching surface of the bleed crank and the bushing. At the same time, by utilizing the gas pressure difference between the inside and outside of the turbine case, a gas force F pointing to the outside of the turbine case is generated inside the turbine case on the bleed crank, so that the bleed crank and the bushing are clamped on the matching end surface inside the turbine case, improving the sealing of the matching surface of the two, reducing the leakage of high-temperature and high-pressure gas here, thereby reducing the probability of sharp bleed sound and reducing the deposition of black carbon smoke on the surface of the rocker arm component, and improving user satisfaction.

[0027] As described above, the utility model provides a structure for improving the gas leakage at the gap of the supercharger turbine case bushing. The structure is simple and low in cost. By making small changes to the existing structure, the generation of a gap between the bleed crank and the bushing can be well avoided, and the gas leakage under specific working conditions can be effectively improved. At the same time, the structure in the present application has few changes to the existing moving parts structure and has the advantage of low subsequent maintenance costs.

[0028] The protection scope of the present invention includes but is not limited to the above embodiments. The protection scope of the present invention shall be based on the claims. Any replacement, deformation, and improvement of the technology that can be easily thought of by technicians in this field shall fall within the protection scope of the present invention.

Claims

1. A structure for improving the air leakage at the gap of a turbine case bushing of a supercharger, comprising a turbine case (6), wherein an air valve (61) is provided inside the turbine case (6), and a bleed crank (62) is connected to the air valve (61); The turbine case (6) is provided with a through hole (63), a bushing (64) is provided in the through hole (63), and the exhaust crank (62) passes through the bushing (64) and is connected to the rocker arm component (7); Features: The inner end surface of the bushing (64) is retracted into the through hole (63); a boss (621) is provided on the deflation crank (62); the boss (621) is located at a position where the bushing (64) is retracted in the through hole (63); and a surface of the boss (621) abuts against the inner end surface of the bushing (64) for sealing.

2. A structure for improving the air leakage at the gap of a supercharger turbine case bushing according to claim 1, characterized in that: The bushing (64) is assembled in the through hole (63) by interference fit, and the deflating crank (62) passes through the bushing (64) and is rotatable.

3. A structure for improving the air leakage at the gap of the supercharger turbine case bushing according to claim 2, characterized in that: The length of the through hole (63) is L, the length by which the inner end surface of the bushing (64) is retracted in the through hole (63) is L2, and the length by which the outer end surface of the bushing (64) protrudes beyond the through hole (63) is L3; L2: L=0.1~0.15, L3: L=0.1~0.

2.

4. The structure for improving the air leakage at the gap of the supercharger turbine case bushing according to claim 3, characterized in that: The boss (621) is an annular boss provided on the outer circumference of the deflation crank (62).

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