Anti-surge valve vent tube structure

Abstract

This application discloses an anti-surge valve vent pipe structure. The method includes: a crankcase ventilation outlet pipe, an anti-surge valve vent pipe, an anti-surge valve, and a turbocharger; the anti-surge valve vent pipe has an outer pipe, a first inner reducing pipe, and a second inner reducing pipe. The first inner reducing pipe allows gas to flow from the larger end to the smaller end, and the second inner reducing pipe allows gas to flow from the smaller end to the larger end; the anti-surge valve vent pipe is connected to the anti-surge valve, the crankcase ventilation outlet pipe, and the turbocharger; the gas discharged from the crankcase ventilation outlet pipe and the gas discharged from the anti-surge valve increase the gas flow rate through the first and second inner reducing pipes in the anti-surge valve vent pipe, thereby reducing the gas pressure. This prevents the high gas pressure released by the anti-surge valve from affecting the pressure field of the crankcase ventilation opening, effectively reducing the gas pressure at the crankcase ventilation opening.

Description

Technical Field

[0001] This application relates to the mechanical field, and more particularly to a vent pipe structure for an anti-surge valve. Background Technology

[0002] The China VI emission standard for gas engines mandates a closed-loop crankcase ventilation system, meaning that crankcase ventilation exhaust cannot be directly discharged into the atmosphere and must circulate within the engine. This is typically achieved by returning the exhaust gas from the crankcase ventilation system to the turbocharger compressor inlet. The regulation requires pressure monitoring at the crankcase ventilation exhaust port of China VI gas engines, with the measuring point usually located at the oil filler cap on the cylinder head cover or other crankcase exhaust ports, and the pressure must be negative.

[0003] In existing technology, during engine operation, when decelerating, it is necessary to reduce the amount of air-fuel mixture entering the combustion chamber. At this time, the throttle valve will close. When the throttle valve closes, the pressure in the pipe from the turbocharger compressor to the throttle valve will rise instantaneously, generating a reaction force on the turbocharger rotor and causing surge interference that damages the turbocharger. In order to protect the turbocharger, an anti-surge valve is added after the intercooler and before the throttle valve. Through its internal pressure balancing device, the outlet valve is opened to divert the gas to the turbocharger compressor inlet. Since the outlet of the anti-surge valve and the crankshaft ventilation outlet are both connected back to the turbocharger compressor inlet, and because of the engine layout, the two inlets are relatively close, the pressure at the crankcase ventilation outlet is affected by the return pressure of the anti-surge valve, resulting in positive pressure. Summary of the Invention

[0004] This application provides an anti-surge valve vent pipe structure to prevent the high air pressure released by the anti-surge valve from affecting the air pressure field of the crankcase vent, thereby effectively reducing the air pressure of the crankcase vent.

[0005] The first aspect of this application provides an anti-surge valve vent pipe structure, including: a crankcase ventilation outlet pipe, an anti-surge valve vent pipe, an anti-surge valve, and a turbocharger;

[0006] The anti-surge valve vent pipe is provided with an outer pipe, a first inner variable diameter pipe and a second inner variable diameter pipe. The first inner variable diameter pipe is used for gas to flow from the large end to the small end, and the second inner variable diameter pipe is used for gas to flow from the small end to the large end.

[0007] The anti-surge valve vent pipe is connected to the anti-surge valve, the crankcase ventilation outlet pipe, and the turbocharger, respectively.

[0008] The gas discharged from the crankcase ventilation outlet pipe and the gas discharged from the anti-surge valve increase the gas flow rate and reduce the gas pressure by passing through the first inner diameter reducer and the second inner diameter reducer in the anti-surge valve vent pipe.

[0009] Optionally, an opening is provided on one side of the outer tube, and the crankcase ventilation outlet pipe is riveted or welded to the outer tube through the opening.

[0010] Optionally, the diameter of the opening is equal to the diameter of the crankcase ventilation outlet pipe.

[0011] Optionally, the small-port diameter of the first inner-layer reducer is equal to the small-port diameter of the second inner-layer reducer.

[0012] Optionally, the port of the anti-surge valve is connected to one end of the interface of the second inner layer reducer pipe inside the anti-surge valve vent pipe.

[0013] Optionally, the interface of the crankcase ventilation outlet pipe is a section of pipe with an anti-detachment flange structure.

[0014] Optionally, the outer tube is a section of tube with a constant diameter or a variable diameter.

[0015] Optionally, the structure of the anti-surge valve vent pipe is a multi-layer straight pipe structure.

[0016] As can be seen from the above technical solutions, the embodiments of this application have the following advantages: This application provides an anti-surge valve vent pipe structure, including a crankcase ventilation outlet pipe, an anti-surge valve vent pipe, an anti-surge valve, and a turbocharger. The anti-surge valve vent pipe is provided with an outer pipe, a first inner diameter reducer pipe, and a second inner diameter reducer pipe. The first inner diameter reducer pipe is used to direct gas from the large end to the small end, and the second inner pipe is used to direct gas from the small end to the large end. The anti-surge valve vent pipe is connected to the anti-surge valve, the crankcase ventilation outlet pipe, and the turbocharger, respectively. Gas discharged through the crankcase ventilation outlet pipe and the anti-surge valve enters the first inner diameter reducer pipe and the second inner diameter reducer pipe inside the anti-surge valve vent pipe. The anti-surge valve vent pipe reduces gas pressure by increasing gas velocity using Bernoulli's equation through the inner diameter reducer pipe. This avoids the high gas pressure released by the anti-surge valve affecting the gas pressure field of the crankcase ventilation port, effectively reducing the gas pressure of the crankcase ventilation port. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the anti-surge valve vent pipe structure in an embodiment of this application;

[0018] Figure 2 This is a schematic diagram of the piping system structure of the anti-surge valve vent pipe structure in an embodiment of this application. Detailed Implementation

[0019] This application provides an anti-surge valve vent pipe to prevent the high air pressure released by the anti-surge valve from affecting the air pressure field of the crankcase vent, thereby effectively reducing the air pressure of the crankcase vent.

[0020] The technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0021] Please see Figures 1 to 2 This application provides an embodiment of an anti-surge valve vent pipe structure, comprising:

[0022] The engine comprises a crankcase ventilation outlet pipe 4, an anti-surge valve vent pipe 6, an anti-surge valve 7, and a turbocharger 8. The anti-surge valve vent pipe has an outer pipe 62, a first inner reducer pipe 63, and a second inner reducer pipe 64. The first inner reducer pipe 63 is used for gas to flow from the large end to the small end, and the second inner reducer pipe 64 is used for gas to flow from the small end to the large end. The anti-surge valve vent pipe 6 is connected to the anti-surge valve 7, the crankcase ventilation outlet pipe 4, and the turbocharger 8. When the engine is running, the gas discharged through the crankcase ventilation outlet pipe 4 and the gas discharged through the anti-surge valve 7 increases the gas flow rate through the first inner reducer pipe 63 and the second inner reducer pipe 64 in the anti-surge valve vent pipe 6, thereby reducing the gas pressure. This avoids the pressure at the crankcase ventilation outlet being interfered with by the return gas pressure of the anti-surge valve, effectively reducing the pressure at the crankcase ventilation port.

[0023] Specifically, the crankcase ventilation outlet pipe 4 is connected to the anti-surge valve vent pipe 6. The anti-surge valve vent pipe utilizes Bernoulli's principle to set the first inner diameter reducer pipe 63 so that the incoming gas flows from the large port to the small port, and the second inner diameter reducer pipe 64 so that the gas flows from the small port to the large port. This increases the gas flow rate in the vent pipe, thereby reducing the gas pressure.

[0024] Please see Figure 2The anti-surge valve vent pipe system includes: 1. Cylinder head cover (with built-in oil-gas separator), 2. Breather pressure sensor, 3. External oil-gas separator, 4. Crankcase ventilation outlet pipe, 5. Air filter, 6. Anti-surge valve vent pipe, 7. Anti-surge valve, 8. Turbocharger, 9. Intercooler, 10. Throttle valve, 11. Intake manifold, 12. Internal engine components. During engine operation, when deceleration is required, the throttle valve closes, and the pressure in the pipe from the turbocharger compressor to the throttle valve increases instantaneously. The rising air pressure exerts a reaction force on the turbocharger rotor, causing surge interference that damages the turbocharger. To protect the turbocharger, anti-surge valves are added after the intercooler and before the throttle valve to divert gas flow to the turbocharger engine inlet. Due to the engine layout, the crankcase ventilation outlet pipe and the anti-surge valve are located relatively close to each other, and the pressure at the crankcase ventilation outlet is interfered with by the return pressure of the anti-surge valve. Therefore, an anti-surge valve vent pipe is added to connect the gas flow, using Bernoulli's principle to increase the gas flow rate.

[0025] In this embodiment, an opening is provided on one side of the outer tube of the anti-surge valve vent pipe, the diameter of which is equal to the diameter of the crankcase ventilation outlet pipe. The crankcase ventilation outlet pipe has a section with an anti-detachment flange structure. The crankcase ventilation outlet pipe is riveted or welded to the opening on one side of the outer tube through this pipe, allowing the gas originally discharged from the crankcase ventilation outlet pipe into the turbocharger inlet to be discharged into the anti-surge valve vent pipe. One end of the anti-surge valve vent pipe is connected to the gas discharged from the anti-surge valve, allowing the gas originally discharged from the anti-surge valve to be discharged into the anti-surge valve vent pipe, and directly connected to one end of the second inner reducing pipe inside the anti-surge valve vent pipe.

[0026] In this embodiment, the small port diameter of the first inner variable pipe is equal to the small port diameter of the second inner variable pipe, and the first inner variable pipe and the second inner variable pipe are not connected in the anti-surge valve vent pipe. The second inner variable pipe connected to the anti-surge valve interface is set to allow gas to flow from the small end to the large end, and the outlet of the first inner variable pipe discharged from the anti-surge valve vent pipe is set to allow gas to flow from the large end to the small end. This setting can effectively increase the flow rate of gas entering the anti-surge valve vent pipe.

[0027] In this embodiment, the vent pipe of the anti-surge valve is changed from a common single-layer straight pipe structure to a multi-layer straight pipe structure. The outer pipe is a section of equal diameter or variable diameter pipe. Furthermore, the materials of the outer pipe, the first inner variable diameter pipe, and the second inner variable diameter pipe are not limited, which can effectively change the channel diameter and better improve the gas flow rate.

[0028] It should be noted that the above description of the disclosed embodiments enables those skilled in the art to implement or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A vent pipe structure for an anti-surge valve, characterized in that, include: Crankcase ventilation outlet pipe, anti-surge valve vent pipe, anti-surge valve, and turbocharger; The anti-surge valve vent pipe is provided with an outer pipe, a first inner variable diameter pipe and a second inner variable diameter pipe. The first inner variable diameter pipe is used for gas to flow from the large end to the small end, and the second inner variable diameter pipe is used for gas to flow from the small end to the large end. The anti-surge valve vent pipe is connected to the anti-surge valve, the crankcase ventilation outlet pipe, and the turbocharger, respectively. The gas discharged from the crankcase ventilation outlet pipe and the gas discharged from the anti-surge valve increase the gas flow rate and reduce the gas pressure through the first inner diameter reducer pipe and the second inner diameter reducer pipe in the anti-surge valve vent pipe. An opening is provided on one side of the outer tube of the anti-surge valve vent pipe, the diameter of which is equal to the diameter of the crankcase ventilation outlet pipe. The crankcase ventilation outlet pipe is provided with an anti-detachment flange structure. The crankcase ventilation outlet pipe is riveted or welded to the opening on one side of the outer tube through the anti-detachment flange structure, so as to discharge the gas discharged from the crankcase ventilation outlet pipe into the turbocharger inlet into the anti-surge valve vent pipe. The small port diameter of the first inner reducing pipe is equal to the small port diameter of the second inner reducing pipe, and the first inner reducing pipe and the second inner reducing pipe are not connected.

2. The anti-surge valve vent pipe structure according to claim 1, characterized in that, An opening is provided on one side of the outer tube, and the crankcase ventilation outlet pipe is riveted or welded to the outer tube through the opening.

3. The anti-surge valve vent pipe structure according to claim 2, characterized in that, The diameter of the opening is equal to the diameter of the crankcase ventilation outlet pipe.

4. The anti-surge valve vent pipe structure according to claim 1, characterized in that, The port of the anti-surge valve is connected to one end of the interface of the second inner layer reducer pipe inside the anti-surge valve vent pipe.

5. The anti-surge valve vent pipe structure according to any one of claims 1 to 3, characterized in that, The crankcase ventilation outlet pipe has a section of pipe with an anti-detachment flange structure at its interface.

6. The anti-surge valve vent pipe structure according to any one of claims 1 to 3, characterized in that, The outer tube is a section of tube with a constant diameter or a variable diameter.

7. The anti-surge valve vent pipe structure according to any one of claims 1 to 3, characterized in that, The anti-surge valve vent pipe has a multi-layer straight pipe structure.

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