A turbocharger surge test device

Abstract

The present invention relates to the field of turbocharger experimental technology, and in particular to a turbocharger surge experimental device, comprising a branch pipe 1, a branch pipe 2, a pressure regulating tank and an exhaust pipe, wherein a vortex flowmeter and a flow regulating valve 1 are arranged on the exhaust pipe, and branch pipes 1 and 2 are connected to the two sides of the exhaust pipe respectively, a back-surge valve is arranged on the pipeline of branch pipe 1, and a flow regulating valve 2 is arranged on the pipeline of branch pipe 2, a limiting valve is arranged at one end of the pressure regulating tank, and a differential pressure transmitter is arranged at the other end of the pressure regulating tank, and the limiting valve is connected to the pipe section before the vortex flowmeter through a connecting pipe, and a three-way joint is arranged on the pipeline of the connecting pipe, and one end of the three-way joint is connected to the differential pressure transmitter through a pipeline. This experimental device can simulate the conditions for the occurrence of turbocharger surge, and can also test the tolerance limit of the turbocharger to surge, thereby ensuring the smooth progress of turbocharger research and development.

Description

Technical Field

[0001] The invention relates to the technical field of turbocharger experiments, and in particular to a turbocharger surge experiment device. Background Art

[0002] A turbocharger is a device that uses the exhaust gas from an internal combustion engine to drive the turbine to rotate, which in turn drives the coaxial impeller to compress and deliver air, thereby compressing the air to increase the intake volume. The working principle of a turbocharger is to use the exhaust gas generated by the operation of an internal combustion engine to drive an air compressor composed of two coaxial impellers. Specifically, the exhaust gas drives the turbine to rotate, and the turbine in turn drives the coaxial impeller to rotate, and the impeller compresses the air sent from the air filter pipe to pressurize it into the cylinder. When the engine speed increases, the exhaust gas discharge speed and the turbine speed also increase synchronously, and the impeller compresses more air into the cylinder, thereby improving the volumetric efficiency of the engine and increasing the engine's output power.

[0003] Turbocharger surge refers to the phenomenon that the resistance of airflow in the system increases due to blockage or poor lubrication of the boost system channel, which in turn causes the compressor back pressure to increase and the flow rate to decrease. Surge may cause engine performance to decline and even damage the turbocharger.

[0004] In the development of turbochargers, it is necessary to use experimental devices to simulate the conditions for surge (such as intake air volume, exhaust air volume, etc.) or to explore the tolerance limit of turbochargers to surge. However, such experimental devices are lacking in the prior art. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a turbocharger surge test device, which is specifically implemented by the following technical solutions:

[0006] A turbocharger surge test device comprises a branch pipe 1, a branch pipe 2, a pressure-surge tank and an exhaust pipe for connecting to an exhaust port of a compressor end of a turbocharger, a vortex flowmeter and a flow regulating valve 1 being sequentially arranged on the pipeline of the exhaust pipe in a gas flow direction, a de-surge valve being arranged on the pipeline of the branch pipe 1, one end of the branch pipe 1 being connected to a pipe section between the vortex flowmeter and the flow regulating valve 1, the other end of the branch pipe 1 being connected to a pipe section after the flow regulating valve 1, a flow regulating valve 2 being arranged on the pipeline of the branch pipe 2, one end of the branch pipe 2 being connected to a pipe section between the vortex flowmeter and the flow regulating valve 1, the other end of the branch pipe 2 being connected to a pipe section after the flow regulating valve 1, a flow limiting valve being arranged at one end of the pressure-surge tank, a pressure differential transmitter being arranged at the other end of the pressure-surge tank, the flow limiting valve being connected to the pipe section before the vortex flowmeter through a connecting pipe, a three-way joint being arranged on the pipeline of the connecting pipe, one end of the three-way joint being connected to the pressure differential transmitter through a pipeline.

[0007] Preferably, the exhaust pipe consists of a pipe section one, a pipe section two and a pipe section three which are connected in sequence, the vortex flowmeter is arranged between the pipe section one and the pipe section two, the flow regulating valve one is arranged between the pipe section two and the pipe section three, one end of the branch pipe one is connected to the pipe section two, the other end of the branch pipe one is connected to the pipe section three, one end of the branch pipe two is connected to the pipe section two, the other end of the branch pipe two is connected to the pipe section three, and one end of the connecting pipe is connected to the pipe section one.

[0008] Preferably, the degassing valve is normally closed.

[0009] Preferably, the opening of the degassing valve is triggered by an electrical signal from a differential pressure transmitter to achieve feedback regulation.

[0010] Preferably, the branch pipe 1 and the branch pipe 2 are symmetrically distributed on both sides of the exhaust pipe.

[0011] Preferably, the diameters of branch pipe 1 and branch pipe 2 are consistent and smaller than the diameter of the exhaust pipe.

[0012] After adopting the above technical solution, the beneficial effects of the present invention are:

[0013] This experimental device can not only simulate the conditions for the occurrence of turbocharger surge, but also test the turbocharger's tolerance limit to surge, ensuring the smooth progress of turbocharger research and development. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0015] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0016] Figure 2 It is a schematic diagram of the top structure of the present invention.

[0017] Explanation of the reference numerals: 1-exhaust pipe, 2-vortex flowmeter, 3-connecting pipe, 4-branch pipe one, 5-breathing valve, 6-flow regulating valve one, 7-branch pipe two, 8-flow regulating valve two, 9-flow limiting valve, 10-pressure regulating tank, 11-pressure differential transmitter, 12-three-way connector. DETAILED DESCRIPTION

[0018] The features and exemplary embodiments of various aspects of the present invention will be described in detail below. In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only configured to explain the present invention and are not configured to limit the present invention. For those skilled in the art, the present invention can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present invention by illustrating examples of the present invention.

[0019] The directional words appearing in the following description are all directions shown in the figures, and do not limit the specific structure of the present invention. In the description of the present invention, it should also be noted that, unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0020] The embodiment of the present invention provides a turbocharger surge experimental device, which is designed to simulate and analyze the surge phenomenon of the turbocharger under different working conditions, explore the tolerance limit of the turbocharger to surge, and prevent and control surge through feedback regulation. The experimental device consists of an exhaust pipe 1, a vortex flowmeter 2, a branch pipe 1 4, a surge relief valve 5, a flow regulating valve 1 6, a branch pipe 2 7, a flow regulating valve 2 8, a flow limiting valve 9 and a pressure stabilizing tank 10.

[0021] The exhaust pipe 1 is formed by connecting pipe section 1, pipe section 2 and pipe section 3 in sequence, and is used to simulate the exhaust process of the compressor end of the turbocharger. One end of pipe section 1 is connected to the exhaust port of the compressor end of the turbocharger, and one end of pipe section 3 is vented and connected to the atmosphere. The vortex flowmeter 2 is installed between pipe section 1 and pipe section 2 to accurately measure the gas flow through the exhaust pipe 1. The flow regulating valve 1 6 is located after the vortex flowmeter 2 and is installed between pipe section 2 and pipe section 3 to adjust the gas flow through the exhaust pipe 1.

[0022] Branch pipe 1 4 and branch pipe 2 7 are used to divert gas under certain conditions. The two branches provide an additional way to adjust the flow in the main pipe. Branch pipe 1 4 and branch pipe 2 7 have the same diameter, and both are smaller than the diameter of the exhaust pipe 1. Branch pipe 1 4 and branch pipe 2 7 are symmetrically distributed on both sides of the exhaust pipe 1, and the positions of the two branch pipes relative to the vortex flowmeter 2 are the same. This layout can ensure that the gas diverted from the two branches has a balanced impact on the gas flow in the exhaust pipe 1, avoids deviations caused by different positions of the diversion points, and helps to reduce eddies, turbulence or other flow phenomena caused by diversion that may affect the measurement results of the vortex flowmeter 2.

[0023] Branch pipe 1 4 and branch pipe 2 7 are similar in structure, both of which are connected to pipe section 2 at one end and to pipe section 3 at the other end. A gas relief valve 5 is provided on the pipeline of branch pipe 1 4, which is in a normally closed state. When surge occurs, by triggering the opening of the gas relief valve 5, a part of the gas is diverted from the exhaust pipe 1 to the branch pipe 1 4, thereby increasing the total gas output, helping to stabilize the pressure fluctuation of the exhaust system and reduce the amplitude and duration of surge. A flow regulating valve 2 8 is provided on the pipeline of branch pipe 2 7, which is used to adjust the gas flow in the branch to achieve flow control under different experimental conditions.

[0024] A flow limiting valve 9 and a differential pressure transmitter 11 are installed at both ends of the pressure stabilizing tank 10, respectively. The flow limiting valve 9 is connected to the pipe section 1 before the vortex flowmeter 2 through the connecting pipe 3. A three-way joint 12 is provided on the pipeline of the connecting pipe 3, and one end of the three-way joint 12 is connected to the differential pressure transmitter 11 through a pipeline. The three-way joint 12 is used to control the flow direction of the gas, and the gas can be selected to flow to the flow limiting valve 9 or the differential pressure transmitter 11. The opening of the gas relief valve 5 is triggered by the electrical signal of the differential pressure transmitter 11 to achieve feedback regulation.

[0025] The experimental device is used to simulate the surge phenomenon of the turbocharger under the condition of air discharge, and the specific method is as follows.

[0026] The airflow discharged from the compressor end of the turbocharger flows to the exhaust pipe 1, part of the gas is diverted to the connecting pipe 3, and another part of the gas is diverted to the branch pipe 2 7. The part of the airflow entering the connecting pipe 3 forms two paths, one of which flows to the differential pressure transmitter 11 through the three-way joint 12, and the other flows to the limiting valve 9 through the three-way joint 12, and then enters the pressure regulating tank 10 at a constant flow rate. At this time, the pressure value in the pressure regulating tank 10 is in a balanced state with the pressure value in the exhaust pipe 1, and there is no pressure difference at both ends of the differential pressure transmitter 11. When the pressure in the exhaust pipe 1 rises or falls steadily, the gas can enter the pressure regulating tank 10 or be released from the pressure regulating tank 10 through the connecting pipe 3 and the limiting valve 9. At this time, there is basically no pressure change at both ends of the differential pressure transmitter 11, and the differential pressure transmitter 11 will not transmit signals to the outside.

[0027] The flow regulating valve 1 6 and the flow regulating valve 2 8 are adjusted electronically or manually. At this time, the pressure in the exhaust pipe 1 will fluctuate continuously. Because of the existence of the flow limiting valve 9, the gas in the pressure regulating tank 10 will not quickly enter or release (when the pressure in the exhaust pipe 1 is greater than the pressure in the pressure regulating tank 10, the gas in the exhaust pipe 1 enters the pressure regulating tank 10 through the connecting pipe 3; when the pressure in the exhaust pipe 1 is less than the pressure in the pressure regulating tank 10, the gas in the pressure regulating tank 10 enters the exhaust pipe 1 through the connecting pipe 3), so that the differential pressure transmitter 11 connecting the pressure regulating tank 10 and the connecting pipe 3 will detect the pressure imbalance at both ends, and will send a signal and then alarm, thereby judging that the supercharger has surged.

[0028] At this time, there are two modes that can be operated through the computer. One is that when the differential pressure transmitter 11 detects that the pressure at both ends is unbalanced, it sends a signal to trigger the opening of the back-surge valve 5, and a part of the gas is diverted from the exhaust pipe 1 to the branch pipe 1 4, thereby increasing the total gas output, which helps to stabilize the pressure fluctuation of the exhaust system and eliminate or reduce the amplitude and duration of surge; the other is that the differential pressure transmitter 11 still sends a signal, but does not perform the automatic opening operation of the back-surge valve 5, and a warning window pops up on the computer screen to let the tester confirm whether to further explore the surge limit or manually open the back-surge valve 5. If further exploration is required, the flow control valve 1 6 and the flow control valve 2 8 will continue to be adjusted electronically or manually, and finally the back-surge valve 5 will be manually opened to eliminate surge.

[0029] According to the embodiments of the present invention as described above, these embodiments do not describe all the details in detail, nor do they limit the invention to specific embodiments. Obviously, many modifications and changes can be made based on the above description. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can make good use of the present invention and the modified use based on the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A turbocharger surge test device, characterized in that: The invention comprises a branch pipe 1 (4), a branch pipe 2 (7), a pressure stabilizing tank (10), and an exhaust pipe (1) for connecting to an exhaust port of a turbocharger compressor end, wherein a vortex flowmeter (2) and a flow regulating valve 1 (6) are arranged in sequence on the exhaust pipe (1) along the gas flow direction, a gas relief valve (5) is arranged on the branch pipe 1 (4), one end of the branch pipe 1 (4) is connected to the exhaust pipe (1) section between the vortex flowmeter (2) and the flow regulating valve 1 (6), the other end of the branch pipe 1 (4) is connected to the exhaust pipe (1) section after the flow regulating valve 1 (6), and a flow regulating valve 2 (8) is arranged on the branch pipe 2 (7). One end of the branch pipe (7) is connected to the exhaust pipe (1) section between the vortex flowmeter (2) and the flow regulating valve (6), and the other end of the branch pipe (7) is connected to the exhaust pipe (1) section after the flow regulating valve (6). A flow limiting valve (9) is provided at one end of the pressure regulating tank (10), and a pressure differential transmitter (11) is provided at the other end of the pressure regulating tank (10). The flow limiting valve (9) is connected to the exhaust pipe (1) section before the vortex flowmeter (2) through a connecting pipe (3). A three-way joint (12) is provided on the pipeline of the connecting pipe (3), and one end of the three-way joint (12) is connected to the pressure differential transmitter (11) through a pipeline.

2. The turbocharger surge test device according to claim 1, characterized in that: The exhaust pipe (1) is composed of a pipe section 1, a pipe section 2 and a pipe section 3 which are connected in sequence; the vortex flowmeter (2) is arranged between the pipe section 1 and the pipe section 2; the flow regulating valve 1 (6) is arranged between the pipe section 2 and the pipe section 3; one end of the branch pipe 1 (4) is connected to the pipe section 2; the other end of the branch pipe 1 (4) is connected to the pipe section 3; one end of the branch pipe 2 (7) is connected to the pipe section 2; the other end of the branch pipe 2 (7) is connected to the pipe section 3; and one end of the connecting pipe (3) is connected to the pipe section 1.

3. The turbocharger surge test device according to any one of claims 1 or 2, characterized in that: The gas relief valve (5) is in a normally closed state.

4. The turbocharger surge test device according to any one of claims 1 or 2, characterized in that: The opening of the gas relief valve (5) is triggered by an electrical signal from a differential pressure transmitter (11), thereby achieving feedback regulation.

5. The turbocharger surge test device according to any one of claims 1 or 2, characterized in that: The branch pipe 1 (4) and the branch pipe 2 (7) are symmetrically distributed on both sides of the exhaust pipe (1).

6. The turbocharger surge test device according to any one of claims 1 or 2, characterized in that: The diameters of the branch pipe 1 (4) and the branch pipe 2 (7) are consistent, and smaller than the diameter of the exhaust pipe (1).

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