Reduction constant-pressure device for air inlet turbine of mining explosion-proof engine

Abstract

The utility model relates to a mining explosion-proof engine air inlet turbine speed reduction constant pressure device which comprises an engine and a turbocharger, the turbocharger comprises a turbine and a pump wheel, a turbine air inlet is communicated with an engine exhaust port through an exhaust manifold, a turbine air outlet is communicated with an exhaust pipe, and the mining explosion-proof engine air inlet turbine speed reduction constant pressure device further comprises a nozzle installed on a turbine shell. A series of problems of air-fuel ratio imbalance and the like caused by an existing water-cooling supercharger are perfectly solved, the cooling effect of the water-cooling supercharger is not affected, the cooling effect of the water-cooling supercharger is not affected, meanwhile, the cooling efficiency of the water-cooling supercharger is improved, and the service life of the water-cooling supercharger is prolonged. The air-fuel ratio of an engine can be adjusted, the air inlet pressure can be accurately controlled, meanwhile, the rotating speed of a turbine shaft of the supercharger is controlled, the supercharger works in the optimal state, and due to the fact that the air-fuel ratio adjusting device is directly installed on a water-cooled supercharger assembly, the occupied space is extremely small. Installation is relatively convenient, and later maintenance cost is low.

Description

Technical Field

[0001] The utility model relates to the technical field of engines, in particular to the field of explosion-proof engines for mining, and specifically refers to an air intake turbine deceleration constant pressure device for explosion-proof engines for mining. Background Art

[0002] In recent years, with the significant improvement of human safety awareness, mining explosion-proof diesel engines face more severe tests. Its stable operating performance will be improved again. It is well known that the air-fuel ratio determines the running stability of the diesel engine and also affects the exhaust emission index. If the diesel engine cannot run smoothly during operation, it will not only reduce its service life, but also cause huge safety hazards. Since the exhaust turbine of the mining explosion-proof diesel engine is directly in contact with the high-temperature and high-pressure exhaust gas, the temperature is extremely high. In order to solve this problem, many manufacturers have adopted a water-cooling cooling method. Although this method is simple and effective, and the later maintenance cost is low, it also buries huge safety hazards. After the exhaust turbine is equipped with a water jacket on the periphery and water-cooled, the air-fuel ratio regulating unloading valve originally installed on the exhaust turbine cannot be installed. As a result, the boost pressure of the explosion-proof engine is too large during operation, which makes the oxygen content in the combustion chamber too high, and then the nitrogen oxide content in the exhaust gas increases accordingly. At the same time, it also makes the turbocharger assembly work in a high-speed stall state, resulting in early wear of the turbocharger assembly and shortening the service life. And once the supercharger is seriously damaged, the oil will enter the combustion chamber through the damaged supercharger, causing immeasurable danger. Therefore, the coal mine site urgently needs an effective solution to solve the hidden problems of the explosion-proof engine supercharger assembly. Utility Model Content

[0003] In view of the deficiencies of the prior art, the utility model provides a mining explosion-proof engine intake turbine deceleration constant pressure device, which is used for assisting the explosion-proof diesel engine to run smoothly.

[0004] The utility model is realized through the following technical scheme, and provides a mining explosion-proof engine intake turbine deceleration constant pressure device, comprising an engine and a turbocharger, wherein the turbocharger comprises a turbine and a pump wheel, the turbine air inlet is connected with the engine exhaust port through an exhaust manifold, the turbine air outlet is connected with the exhaust pipe, and also comprises a nozzle installed on the turbine housing, the nozzle is connected with the exhaust pipe through a connecting pipe, a valve is installed on the connecting pipe, and the nozzle faces the turbine blades and rotates in the opposite direction to the turbine blades.

[0005] In this scheme, when the pressure in the exhaust pipe is greater than the preset pressure value, the sequential valve opens and guides the exhausted high-pressure gas to the nozzle of the turbine through the connecting pipe. After passing through the nozzle, the high-pressure and high-flow gas acts on the turbine blades, forming a thrust in the opposite direction of rotation of the turbine blades, thereby slowing down the rotation speed of the turbine blades, accurately controlling the intake pressure, and matching the optimal air-fuel ratio.

[0006] As an optimization, the valve is a sequence valve. The sequence valve in this solution can be opened automatically according to the pressure, thereby realizing automatic control.

[0007] As an optimization, the nozzle is installed on the outer circumference of the turbine housing. The nozzle in this solution is installed on the outer circumference of the turbine housing, thereby achieving the best effect of controlling the rotation speed.

[0008] As an optimization, the diameter of the tangent circle between the nozzle and the turbine blade is 0.5-0.9 times the outer diameter of the turbine blade. In this solution, the nozzle blows at 0.5-0.9 times the diameter of the turbine blade, which has the best effect of controlling the rotation speed.

[0009] As an optimization, the connecting pipe is connected to an end of the exhaust pipe close to the turbine, thereby shortening the response time.

[0010] The beneficial effects of the utility model are as follows: the utility model is a mining explosion-proof engine intake turbine deceleration constant pressure device, which perfectly solves a series of problems such as air-fuel ratio imbalance caused by the current water-cooled supercharger. The device can adjust the engine air-fuel ratio and accurately control the intake pressure without affecting the cooling effect of the water-cooled supercharger. At the same time, the speed of the supercharger turbine shaft is controlled to make it work in the best state. Since the utility model is directly installed on the water-cooled supercharger assembly, it occupies very little space. The installation is relatively convenient and the subsequent maintenance cost is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the structure of the utility model;

[0012] Figure 2 This is a schematic diagram of the interior of the turbine of the utility model;

[0013] As shown in the figure:

[0014] 1. Engine, 2. Turbine, 3. Pump, 4. Exhaust manifold, 5. Exhaust pipe, 6. Connecting pipe, 7. Sequence valve, 8. Air filter, 9. Intake pipe, 10. Intake manifold, 11. Check valve, 12. Turbine blades, 13. Nozzle, 14. Turbine air inlet. DETAILED DESCRIPTION

[0015] In order to clearly illustrate the technical features of this solution, this solution is described below through a specific implementation method.

[0016] like Figure 1~2 As shown, the utility model is a mining explosion-proof engine intake turbine deceleration constant pressure device, including an engine 1 and a turbocharger, the turbocharger includes a turbine 2 and a pump wheel 3, the turbine air inlet 14 is connected to the exhaust port of the engine 1 through the exhaust manifold 4, the turbine air outlet is connected to the exhaust pipe 5, the air inlet of the pump wheel 3 is connected to the intake pipe 9, the intake pipe 9 is equipped with an air filter 8 and a one-way valve 11, and the air outlet of the pump wheel 3 is connected to the engine through the intake manifold 10. The turbine blades of the turbine 2 and the pump wheel blades of the pump wheel 3 are connected by a connecting shaft, so that the pump wheel blades are driven to rotate by the turbine blades.

[0017] It also includes a nozzle 13 mounted on the housing of the turbine 2. In this embodiment, the nozzle 13 is mounted on the outer circumferential surface of the housing of the turbine 2. The nozzle 13 extends into the interior of the housing of the turbine 2.

[0018] The nozzle 13 faces the turbine blade 12 and rotates in the opposite direction to the turbine blade 12 , so that the gas ejected from the nozzle 13 decelerates the turbine blade 12 .

[0019] The diameter of the tangent circle between the ejection direction of the nozzle 13 and the turbine blade 12 is 0.5-0.9 times the outer diameter of the turbine blade 12. Here, the tangent circle between the ejection direction of the nozzle 13 and the turbine blade 12 refers to a circle drawn with the turbine blade 12 as the center, the circle is tangent to the ejection axis of the nozzle 13, and the diameter of the circle is 0.5-0.9 times the outer diameter of the turbine blade 12. Figure 2 Shown in.

[0020] The nozzle 13 is connected to the exhaust pipe 5 through a connecting pipe 6 . In order to improve the response speed, the connecting pipe 6 is connected to one end of the exhaust pipe 5 close to the turbine 2 .

[0021] The connecting pipe 6 is provided with a valve, which is a sequence valve 7 .

[0022] The use of the utility model:

[0023] When the explosion-proof engine is working, air enters the intake pipe 9 from the air filter 8. A one-way valve 11 is installed on the intake pipe 9 to prevent air backflow. The air in the intake pipe 9 enters the pump wheel 3 of the turbocharger for supercharging and then enters the engine through the intake manifold 10.

[0024] The exhaust gas discharged from the engine 1 enters the turbine inlet 14 of the turbine 2 through the exhaust manifold 4, thereby driving the turbine blades 12 to rotate, and the turbine blades 12 drive the pump blades in the pump wheel to rotate to achieve supercharging. The exhaust gas enters the exhaust pipe 5 through the turbine outlet.

[0025] When the pressure in the exhaust pipe is greater than the preset pressure value, the sequential valve 7 opens and guides the exhausted high-pressure gas to the nozzle 13 of the turbine through the connecting pipe 6. After passing through the nozzle 13, the high-pressure and high-flow gas acts on the turbine blades 12, forming a thrust in the opposite direction of rotation of the turbine blades 12, thereby slowing down the rotation speed of the turbine blades 12, accurately controlling the intake pressure, and matching the optimal air-fuel ratio.

[0026] Of course, the above description is not limited to the above examples. The technical features not described in the present invention can be achieved by or by adopting the existing technology, which will not be repeated here. The above embodiments and drawings are only used to illustrate the technical scheme of the present invention and are not limitations of the present invention. The present invention is described in detail with reference to the preferred implementation methods. Ordinary technicians in this field should understand that the changes, modifications, additions or substitutions made by ordinary technicians in this technical field within the essential scope of the present invention do not deviate from the purpose of the present invention and should also fall within the scope of protection of the claims of the present invention.

Claims

1. A mining explosion-proof engine intake turbine deceleration and constant pressure device, comprising an engine (1) and a turbocharger, wherein the turbocharger comprises a turbine (2) and a pump wheel (3), the turbine air inlet (14) is connected to the exhaust port of the engine (1) through an exhaust manifold (4), and the turbine air outlet is connected to an exhaust pipe (5), characterized in that: It also includes a nozzle (13) mounted on the casing of the turbine (2), the nozzle (13) being connected to the exhaust pipe (5) via a connecting pipe (6), the connecting pipe (6) being provided with a valve, the nozzle (13) being directed toward the turbine blades (12) and rotating in the opposite direction to the turbine blades (12).

2. The mining explosion-proof engine intake turbine deceleration constant pressure device according to claim 1, characterized in that: The valve is a sequence valve (7).

3. The mining explosion-proof engine intake turbine deceleration constant pressure device according to claim 1, characterized in that: The nozzle (13) is mounted on the outer circumferential surface of the turbine (2) casing.

4. The mining explosion-proof engine intake turbine deceleration constant pressure device according to claim 1, characterized in that: The diameter of the circle tangent to the turbine blade (12) in the spraying direction of the nozzle (13) is 0.5-0.9 times the outer diameter of the turbine blade (12).

5. The mining explosion-proof engine intake turbine deceleration constant pressure device according to claim 1, characterized in that: The connecting pipe (6) is connected to an end of the exhaust pipe (5) close to the turbine (2).

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