Air-cooled deflation valve actuator and exhaust gas turbocharger

Abstract

The utility model relates to the technical field of engine turbochargers, in particular to an air-cooled deflation valve actuator and an exhaust gas turbocharger. The actuator comprises a shell; a cooling cover is connected to the outer side of the shell in a sleeving mode, a cooling cavity is formed between the cooling cover and the shell, a cooling air inlet and a cooling air outlet are formed in the cooling cover, the cooling air inlet and the cooling air outlet are both communicated with the cooling cavity, and the cooling air outlet is communicated with an air inlet of the air compressor. The problems that an existing actuator is low in cooling efficiency and complex in structure are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of engine turbochargers, in particular to an air-cooled exhaust valve actuator and an exhaust gas turbocharger. Background Art

[0002] With the emission upgrade and the continuous reduction of fuel consumption of engines, the specific power of diesel engines is increasing, and the exhaust temperature is rising. As an important component of the engine, the exhaust gas turbocharger plays a very important role in this. However, excessive temperature can cause turbocharger failure, among which the failure of the turbocharger exhaust valve actuator due to excessive exhaust temperature is common.

[0003] The prior art discloses a self-cooling supercharger actuator, which achieves cooling by changing the internal cavity to generate a pressure difference through the action of the actuator. However, in this method, the change in the chamber volume is limited, and the pressure difference generated is small. Cooling through its own pressure difference cannot quickly remove heat, the cooling efficiency is low, and the structure is too complicated. Utility Model Content

[0004] In view of the deficiencies in the prior art, the purpose of the embodiments of the utility model is to provide an air-cooled air release valve actuator to solve the problems of low cooling efficiency and complex structure of the existing actuator.

[0005] In order to achieve the above purpose, the embodiment of the utility model provides the following technical solutions:

[0006] A wind-cooled air release valve actuator is used for a turbocharger, the turbocharger includes a compressor, and the actuator includes a shell; a cooling hood is sleeved on the outer side of the shell, a cooling chamber is formed between the cooling hood and the shell, a cooling air inlet and a cooling air outlet are provided on the cooling hood, the cooling air inlet and the cooling air outlet are both connected to the cooling chamber, and the cooling air outlet is connected to the air inlet of the compressor.

[0007] Optionally, the cooling air passes through the cooling air inlet, the cooling chamber and the cooling air outlet in sequence to form a cooling air path, and a filter is provided on the cooling air path.

[0008] Optionally, the cooling cover has a first end and a second end, the first end and the second end are arranged opposite to each other, the cooling air outlet is arranged at the first end of the cooling cover, and the cooling air inlet is arranged at the second end of the cooling cover.

[0009] Optionally, one cooling air outlet is provided, and at least two cooling air inlets are provided.

[0010] Optionally, the plurality of cooling air inlets are evenly distributed at the second end of the cooling hood.

[0011] Optionally, the filter is arranged at the cooling air outlet.

[0012] Optionally, an air film is provided in the shell of the actuator, one side of the air film forms a sealed space with the shell, and the other side of the air film is provided with a spring and a valve stem, one end of the spring rests on the air film, and the other end rests on the shell, and the valve stem extends out of the shell.

[0013] Optionally, a compressed air pipe is provided on the shell, and the compressed air pipe passes through the cooling chamber. One end of the compressed air pipe is connected to the sealed space, and the other end is connected to the air outlet of the compressor.

[0014] Optionally, the turbocharger includes a turbine, a bleed valve is provided on the turbine, and one end of the valve stem extending out of the housing is connected to the bleed valve.

[0015] The embodiment of the utility model further provides an exhaust gas turbocharger, comprising the air-cooled exhaust valve actuator as described above.

[0016] One or more technical solutions provided in the embodiments of the present utility model have at least the following technical effects or advantages:

[0017] The air-cooled bleed valve actuator of the utility model takes air from the air inlet of the compressor, so negative pressure is formed at both ends of the cooling hood when the supercharger is running. The cooling gas flows from one end of the cooling hood to the other end of the cooling hood due to the intake pressure difference. No external cooling equipment is required, so the bleed valve actuator can be self-cooled, solving the problem of failure caused by high temperature. Moreover, the negative pressure is formed by the air inlet of the compressor, and the pressure difference generated is large, which can quickly take away the heat and improve the cooling efficiency. The cooling effect can be achieved by adding a cooling hood and connecting pipes, and the structure is simple. At the same time, under low load, the supercharger speed is low, the gas flow is slow, and the cooling capacity is low. Under high load, the supercharger speed is high, the gas flow is fast, and the cooling capacity is high, which can meet the needs of large heat dissipation requirements under high speed.

[0018] Additional advantages of the present invention will be given in the following description, and some will become apparent from the following description or will be understood through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0020] Figure 1 It is a schematic diagram of the exhaust valve actuator provided by the embodiment of the utility model in the entire turbocharger;

[0021] Figure 2 It is a schematic diagram of a vent valve actuator provided by an embodiment of the utility model;

[0022] In the figure: 1. actuator; 11. valve stem; 12. cooling cover; 121. cooling air outlet; 122. filter; 123. cooling air inlet; 13. compressed air pipe; 14. cooling chamber; 15. sealed space; 16. housing; 17. spring; 18. air film; 2. turbine; 21. exhaust gas outlet; 22. exhaust gas inlet; 23. bleed valve; 3. compressor; 31. air inlet; 32. air outlet;

[0023] In order to show the positions of various parts, the distances or sizes between them are exaggerated and the schematic diagram is for reference only. DETAILED DESCRIPTION

[0024] It should be noted that the following detailed descriptions are illustrative and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those of ordinary skill in the art to which the present invention belongs. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0025] Exhaust gas turbocharger: Exhaust gas turbocharging is a method of using the exhaust energy of the diesel engine to drive the turbine to achieve supercharging of the internal combustion engine. The exhaust gas turbocharger is mainly composed of three parts: turbine, bearing body and compressor. The high-temperature and high-speed combustion gas discharged from the diesel engine cylinder is supplied to the turbine of the turbocharger through the exhaust pipe, driving the turbine to rotate, and the turbine then drives the compressor impeller coaxial with it to rotate. The compressor compresses the inhaled air, and the air with increased pressure flows through the intake pipe of the internal combustion engine and is supplied to the cylinder, thereby achieving the purpose of supercharging.

[0026] Bleed valve actuator: The function of the blow-off valve actuator is to bypass part of the exhaust gas pressure when the supercharger is working at high load, and its purpose is to improve the low-speed performance of the engine. That is, on the basis of not increasing the engine displacement, the power and torque of the engine can be greatly improved.

[0027] The bleed valve actuator mainly includes an air mold, a spring and a valve stem. The pressure at the compressor outlet pushes the air film. The pressure on the air film compresses the actuator spring. The valve stem connected to the spring moves to push the bleed valve, thereby opening the bleed valve to achieve the function of directly bypassing the gas before the turbine to the gas after the turbine.

[0028] At high speed and high load, the turbocharger bleed valve is opened by the actuator, and part of the exhaust gas enters the exhaust pipe directly through the bleed valve, and part of the exhaust gas is released, and the turbine speed decreases, thereby controlling the boost pressure. When the engine is running at a low speed, the compressor outlet pressure is low, and the bleed valve is closed under the action of the return spring. The exhaust gas discharged by the engine all passes through the turbine end of the supercharger, thereby increasing the speed of the turbine, which can generate a larger intake boost pressure, increase the intake volume, and improve the low-speed performance of the engine.

[0029] Excessively high temperatures can cause turbochargers to malfunction, and it is common for supercharger bleed valve actuators to malfunction due to excessively high exhaust temperatures. To solve this problem, the prior art discloses a self-cooling supercharger actuator that changes the internal cavity through the action of the actuator to produce a pressure difference and thereby achieve cooling. However, in this method, the chamber volume changes are limited, and the pressure difference produced is small. Cooling through its own pressure difference cannot quickly remove heat, the cooling efficiency is low, and the structure is too complicated. In order to solve the above technical problems, the utility model proposes a new air-cooled bleed valve actuator that actively reduces the actuator temperature and avoids over-temperature failure.

[0030] like Figure 1 , Figure 2 As shown, in one embodiment of the utility model, an air-cooled air release valve actuator 1 is proposed, which is used for a turbocharger. The turbocharger includes a compressor 3, and the actuator 1 includes a shell 16. A cooling cover 12 is sleeved on the outside of the shell 16, and a cooling chamber 14 is formed between the cooling cover 12 and the shell 16. A cooling air inlet 123 and a cooling air outlet 121 are provided on the cooling cover 12. The cooling air inlet 123 and the cooling air outlet 121 are both connected to the cooling chamber 14, and the cooling air outlet 121 is connected to the air inlet 31 of the compressor 3.

[0031] The air-cooled bleed valve actuator 1 of the utility model takes air from the air inlet 31 of the compressor 3. Since the exhaust gas drives the turbocharger turbine 2 to rotate, and the turbine 2 is coaxial with the compressor 3, the air inlet 31 of the compressor 3 is in a negative pressure state due to continuous air intake. Figure 2 The left end of the cooling cover 12 is connected to the air inlet of the compressor 3. When the supercharger is running, this part is also under negative pressure, so the gas will flow from the other end of the cooling cover 12 ( Figure 2The air inlet 31 of the compressor 3 is driven by the intake pressure difference. Therefore, there is no need for external cooling equipment. By using the structure of the supercharger itself, the exhaust valve actuator 1 can be self-cooled to solve the problem of failure caused by high temperature. Moreover, negative pressure is formed by the air inlet 31 of the compressor 3, and the pressure difference generated is large, which can quickly take away the heat and improve the cooling efficiency. The cooling effect can be achieved by adding a cooling hood 12 and connecting pipes, and the structure is simple. At the same time, under low load, the supercharger speed is low, the gas flow is slow, and the cooling capacity is low. Under high load, the supercharger speed is high, the gas flow is fast, and the cooling capacity is high, which can meet the needs of high heat dissipation requirements under high speed.

[0032] The cooling air passes through the cooling air inlet 123, the cooling chamber 14 and the cooling air outlet 121 in sequence to form a cooling air path, on which a filter 122 is provided. Since the cooling air that cools the actuator 1 will eventually enter the compressor 3, by providing the filter 122 on the cooling air path, dust in the outside air can be filtered out to prevent dust from being sucked into the supercharger.

[0033] The cooling cover 12 has a first end (i.e. Figure 2 middle left end) and the second end (i.e. Figure 2 The first end and the second end are arranged opposite to each other, the cooling air outlet 121 is arranged at the first end of the cooling cover 12, and the cooling air inlet 123 is arranged at the second end of the cooling cover 12. Furthermore, one cooling air outlet 121 is arranged, and at least two cooling air inlet 123 are arranged. By arranging multiple cooling air inlets 123, more cooling air can be quickly inhaled to ensure efficient cooling efficiency. At the same time, the multiple cooling air inlets 123 are evenly distributed at the second end of the cooling cover 12. By evenly distributing the multiple cooling air inlets 123 at the second end, the overall cooling effect of the actuator 1 can be made more uniform. Since there are multiple cooling air inlets 123 and only one cooling air outlet 121, the filter 122 is arranged at the position of the cooling air outlet 121, and a small amount of filter 122 can be used to achieve the filtering function.

[0034] The cooling air flows from the atmosphere through the cooling air inlet 123, passes through the cooling cover 12, and reaches the filter 122 at the cooling air outlet 121, where the air is filtered to prevent dust from being sucked into the supercharger. The cooling air outlet 121 is connected to the air inlet 31 of the compressor 3 through the cooling air outlet 121. The power of the cooling gas comes from the negative pressure of the intake air caused by the rotation of the compressor 3, which is equivalent to the compressor 3 continuously pumping air as a power source. Therefore, there is no need for external cooling equipment. By using the structure of the supercharger itself, the supercharger exhaust valve 23 can be self-cooled to solve the problem of failure caused by high temperature.

[0035] The utility model realizes self-cooling of the supercharger exhaust valve 23 through simple structural improvement to avoid failure due to overheating. Of course, it is understandable that if this structure is used, the cooling function can also be achieved through some external forced equipment (such as an air compressor on a vehicle), but the source of the gas is different.

[0036] like Figure 2 As shown, an air film 18 is arranged in the housing 16 of the actuator 1, one side of the air film 18 forms a sealed space 15 with the housing 16, and the other side of the air film 18 is provided with a spring 17 and a valve stem 11, one end of the spring 17 abuts against the air film 18, and the other end abuts against the housing 16, and the valve stem 11 extends out of the housing 16. The turbocharger includes a turbine 2, and the turbine 2 is provided with an exhaust gas inlet 22 and an exhaust gas outlet 21, and a purge valve 23 is arranged at the exhaust gas inlet 22, and one end of the valve stem 11 extending out of the housing 16 is connected to the purge valve 23.

[0037] The shell 16 is provided with a compressed air pipe 13, and the compressed air pipe 13 passes through the cooling chamber 14. One end of the compressed air pipe 13 is connected to the sealed space 15, and the other end is connected to the air outlet 32 ​​of the compressor 3. The pressure at the air outlet 32 ​​of the compressor 3 can push the air film 18. The pressure on the air film 18 compresses the spring 17. The valve stem 11 connected to the spring 17 moves to push the bleed valve 23, thereby opening the door of the bleed valve 23, thereby realizing the function of directly bypassing the gas before the turbine to the gas after the turbine.

[0038] Based on the above-mentioned bleed valve actuator 1, an embodiment of the utility model further provides an exhaust gas turbocharger, in which the exhaust gas turbocharger is provided with the bleed valve actuator 1 described in the above-mentioned embodiment. Since the above-mentioned bleed valve actuator 1 has the above-mentioned technical effect, the technical effect of the exhaust gas turbocharger using the bleed valve actuator 1 please refer to the above-mentioned embodiment.

[0039] Although the above describes the specific implementation methods of the utility model in combination with the accompanying drawings, it is not intended to limit the scope of protection of the utility model. Technical personnel in the relevant field should understand that on the basis of the technical solution of the utility model, various modifications or deformations that can be made by technical personnel in this field without creative work are still within the scope of protection of the utility model.

Claims

1. An air-cooled bleed valve actuator for a turbocharger, the turbocharger comprising a compressor, characterized in that: The actuator comprises a housing; A cooling hood is sleeved on the outer side of the shell, a cooling chamber is formed between the cooling hood and the shell, a cooling air inlet and a cooling air outlet are provided on the cooling hood, the cooling air inlet and the cooling air outlet are both connected to the cooling chamber, and the cooling air outlet is connected to the air inlet of the compressor.

2. The air-cooled air release valve actuator according to claim 1, characterized in that: The cooling air passes through the cooling air inlet, the cooling chamber and the cooling air outlet in sequence to form a cooling air path, and a filter is arranged on the cooling air path.

3. The air-cooled air release valve actuator according to claim 2, characterized in that: The cooling cover has a first end and a second end, the first end and the second end are arranged opposite to each other, the cooling air outlet is arranged at the first end of the cooling cover, and the cooling air inlet is arranged at the second end of the cooling cover.

4. The air-cooled air release valve actuator according to claim 3, characterized in that: One cooling air outlet is provided, and at least two cooling air inlets are provided.

5. The air-cooled air release valve actuator according to claim 4, characterized in that: The plurality of cooling air inlets are evenly distributed at the second end of the cooling shroud.

6. The air-cooled air release valve actuator according to claim 4, characterized in that: The filter screen is arranged at the cooling air outlet position.

7. The air-cooled air release valve actuator according to claim 1, characterized in that: An air film is arranged in the housing of the actuator, one side of the air film forms a sealed space with the housing, and the other side of the air film is provided with a spring and a valve stem, one end of the spring abuts against the air film, and the other end abuts against the housing, and the valve stem extends out of the housing.

8. The air-cooled air release valve actuator according to claim 7, characterized in that: The shell is provided with a compressed air pipe, which passes through the cooling chamber. One end of the compressed air pipe is connected to the sealed space, and the other end is connected to the air outlet of the compressor.

9. The air-cooled air release valve actuator according to claim 7, characterized in that: The turbocharger comprises a turbine, on which a bleed valve is arranged, and one end of the valve stem extending out of the housing is connected to the bleed valve.

10. An exhaust gas turbocharger, characterized in that: It comprises an air-cooled air release valve actuator as described in any one of claims 1 to 9.

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