Turbocharger valve drive shaft leakage detection system

Abstract

The supercharger valve transmission shaft leakage detection system is applied to the turbine box assembly; the turbine box assembly includes a volute, a valve transmission shaft, a sleeve, a bleed valve and a rocker arm; the supercharger valve transmission shaft leakage detection system includes a plugging mechanism, a detection mechanism, an adjustment mechanism and a PC; the plugging mechanism includes a box body, a plugging plate and a top sleeve; the adjustment mechanism includes a heater, a pressure regulating valve and an actuator; the detection mechanism includes a pressure gas source, a gas flow meter, a temperature sensor and a pressure sensor; the PC is electrically connected to the gas flow meter, the temperature sensor, the pressure sensor, the heater, the pressure regulating valve and the actuator respectively. The utility model can simulate the motion state and working environment of the valve transmission shaft, detect the leakage of the valve transmission shaft, and thus realize the evaluation of the dynamic sealing performance of the valve transmission shaft.

Description

Technical Field

[0001] The utility model relates to the technical field of turbochargers, in particular to a turbocharger valve transmission shaft leakage detection system. Background Art

[0002] Exhaust gas turbocharger technology can effectively save energy and reduce emissions, and is an important way to restore engine power in plateau areas. It is widely used in commercial vehicles, passenger cars, engineering machinery and other fields. With the application of turbocharging technology, the requirements for the safety and durability of turbochargers are becoming higher and higher.

[0003] The valve drive shaft is an important component in the supercharger. It is rotatably mounted on the volute, with one end connected to the bleed valve inside the volute and the other end connected to the rocker arm outside the volute. Driven by the actuator of the supercharger, the rocker arm rotates to drive the coaxial bleed valve to rotate, thereby achieving bleed or blockage. The specific structure of the valve drive shaft can be found in the utility model "A supercharger valve drive shaft" with the authorization announcement number CN220705805U.

[0004] The installation position of the valve drive shaft on the volute is as follows: Figure 2 As shown. Among them, an arc-shaped air passage 11 and a straight air passage 12 are provided inside the volute 1, and an air vent 13 is also provided inside the volute 1, and the arc-shaped air passage 11 and the straight air passage 12 are connected through the air vent 13. A first port 14, a second port 15, a third port 16 and a transmission shaft hole are provided outside the volute 1, the first port 14 and the second port 15 are respectively connected to the straight air passage 12 and are located at both ends of the straight air passage 12, the third port 16 is connected to the arc-shaped air passage 11 and is located at one end of the arc-shaped air passage 11, and the transmission shaft hole is connected to the straight air passage 12. The valve drive shaft 2 is rotatably installed in the drive shaft hole of the volute 1 through the shaft sleeve 100, and one end thereof located inside the volute 1 (specifically located in the straight air passage 12) is connected to the air vent valve 200, and one end thereof located outside the volute 1 is connected to the rocker arm 300. When the supercharger is working, the rocker arm 300 is driven to rotate by the actuator (not shown in the figure), thereby driving the coaxial air release valve 200 to rotate, thereby blocking or opening the air release port 13.

[0005] Since the valve drive shaft needs to rotate, it cannot be completely sealed in the axial direction. When the supercharger is working, the high-temperature gas inside the volute may leak to the outside of the volute through the gap between the valve drive shaft and the drive shaft hole. The leakage of high-temperature gas will have the following adverse effects: 1. Increase the temperature of the engine working compartment and worsen the working environment of the engine; 2. If the leakage is too much, it may cause a fire and affect the safety of the engine and the whole vehicle; 3. The high-temperature gas will corrode other working parts of the supercharger and affect the life of the supercharger.

[0006] Therefore, before the supercharger is installed and used, testing and evaluating the leakage of the valve drive shaft is an issue that must be addressed. Utility Model Content

[0007] The purpose of the utility model is to overcome the deficiencies of the prior art and to provide a supercharger valve drive shaft leakage detection system, which can simulate the working environment (pressure and temperature) of the valve drive shaft and detect the leakage of the valve drive shaft, thereby realizing the evaluation of the dynamic sealing performance of the valve drive shaft.

[0008] The technical scheme of the utility model is: a supercharger valve drive shaft leakage detection system, which is applied to a turbine box assembly; the turbine box assembly includes a volute, a valve drive shaft, a bushing, an air release valve and a rocker arm; an arc-shaped air passage and a straight air passage are arranged inside the volute, and an air release port is also arranged inside the volute, and the arc-shaped air passage and the straight air passage are connected through the air release port; a first port, a second port, a third port and a drive shaft hole are arranged outside the volute, the first port and the second port are respectively connected to the straight air passage and are located at both ends of the straight air passage, the third port is connected to the arc-shaped air passage and is located at one end of the arc-shaped air passage, and the drive shaft hole is connected to the straight air passage; the valve drive shaft is rotatably installed in the drive shaft hole of the volute through the bushing, and one end of the valve drive shaft located inside the volute is connected to the air release valve, and one end of the valve drive shaft located outside the volute is connected to the rocker arm; the rotation of the rocker arm drives the coaxial air release valve to rotate, thereby blocking or opening the air release port;

[0009] Supercharger valve transmission shaft leakage detection system, including blocking mechanism, detection mechanism, adjustment mechanism and PC;

[0010] The blocking mechanism includes a box body, a blocking plate and a top sleeve; a cavity is provided inside the box body, an opening connected to the cavity is provided at one end of the box body, and the box body is in sealing contact with the first port of the volute through the opening, thereby closing the first port; the end faces of the blocking plate on both sides are respectively defined as the first end face and the second end face, and the blocking plate is in sealing contact with the second port of the volute through the second end face, thereby closing the second port; the top sleeve is a cylindrical component with one end open and the other end closed, and the top sleeve is in sealing contact with the third port of the volute through the opening, thereby closing the third port, and an air inlet interface is provided on the top sleeve;

[0011] The regulating mechanism includes a heater, a pressure regulating valve and an actuator; the heater and the pressure regulating valve are both installed on the section between the air inlet interface and the end opening of the top sleeve; the actuator is connected to the rocker arm to drive the rocker arm to rotate, thereby driving the valve drive shaft to rotate;

[0012] The detection mechanism includes a pressure gas source, a gas flow meter, a temperature sensor and a pressure sensor; the pressure gas source is connected to the air inlet interface of the top sleeve through a pipeline; the gas flow meter is installed on the section between the air inlet interface of the top sleeve and the end opening; the temperature sensor and the pressure sensor are both installed on the box body, the temperature sensor is used to detect the temperature of the box body cavity, and the pressure sensor is used to detect the pressure of the box body cavity;

[0013] The PC is electrically connected to the gas flow meter, the temperature sensor, the pressure sensor, the heater, the pressure regulating valve and the actuator respectively.

[0014] A further technical solution of the utility model is: the blocking mechanism also includes a cylinder A and a cylinder B; the telescopic rod of cylinder A is connected to the first end face of the blocking plate, and when the telescopic rod of cylinder A is extended, the second end face of the blocking plate is pressed against the second port of the volute; the telescopic rod of cylinder B is abutted against the closed end of the top sleeve, and when the telescopic rod of cylinder B is extended, the opening of the top sleeve is pressed against the third port of the volute.

[0015] A further technical solution of the utility model is that the gas flow meter, the heater and the pressure regulating valve are sequentially arranged at intervals along the direction from the air inlet interface of the top sleeve to the end opening.

[0016] A further technical solution of the utility model is that the probe of the temperature sensor and the probe of the pressure sensor respectively pass through the side wall of the box and enter the cavity of the box, the probe of the temperature sensor and the side wall of the box are sealed by glue, and the probe of the pressure sensor and the side wall of the box are sealed by glue.

[0017] The utility model is further described below in conjunction with the figures and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the utility model;

[0019] Figure 2 This is the installation position diagram of the valve drive shaft on the volute.

[0020] Legend: volute 1; curved air passage 11; straight air passage 12; vent port 13; first port 14; second port 15; third port 16; valve drive shaft 2; housing 31; blocking plate 32; top sleeve 33; air inlet interface 331; cylinder A 34; cylinder B 35; heater 41; pressure regulating valve 42; actuator 43; pressure gas source 51; gas flow meter 52; temperature sensor 53; pressure sensor 54; PC 6; sleeve 100; vent valve 200; rocker arm 300. DETAILED DESCRIPTION Example 1

[0021] like Figure 1-2As shown, a supercharger valve drive shaft leakage detection system is applied to a turbine case assembly.

[0022] like Figure 2 As shown, the turbine box assembly includes a volute 1, a valve transmission shaft 2, a sleeve 100, a bleed valve 200 and a rocker arm 300. An arc-shaped air passage 11 and a straight air passage 12 are provided inside the volute 1, and a bleed port 13 is also provided inside the volute 1. The arc-shaped air passage 11 and the straight air passage 12 are connected through the bleed port 13. A first port 14, a second port 15, a third port 16 and a transmission shaft hole are provided outside the volute 1. The first port 14 and the second port 15 are respectively connected to the straight air passage 12 and are located at both ends of the straight air passage 12. The third port 16 is connected to the arc-shaped air passage 11 and is located at one end of the arc-shaped air passage 11. The transmission shaft hole is connected to the straight air passage 12. The valve transmission shaft 2 is rotatably installed in the transmission shaft hole of the volute 1 through the sleeve 100. One end of the valve transmission shaft 2 located inside the volute 1 is connected to the bleed valve 200, and one end of the valve transmission shaft 2 located outside the volute 1 is connected to the rocker arm 300. The rotation of the rocker arm 300 drives the coaxial deflation valve 200 to rotate, thereby blocking or opening the deflation port 13 .

[0023] like Figure 1 As shown, the supercharger valve transmission shaft leakage detection system includes a blocking mechanism, a detection mechanism, a regulating mechanism and a PC 6.

[0024] The blocking mechanism includes a box body 31, a blocking plate 32 and a top sleeve 33. A cavity is provided inside the box body 31, and an opening connected to the cavity is provided at one end of the box body 31. The box body 31 is in sealing contact with the first port 14 of the volute 1 through the opening, thereby closing the first port. The two side end faces of the blocking plate are respectively defined as the first end face and the second end face. The blocking plate 32 is in sealing contact with the second port 15 of the volute 1 through the second end face, thereby closing the second port 15. The top sleeve 33 is a cylindrical component with one end open and the other end closed. The top sleeve 33 is in sealing contact with the third port 16 of the volute 1 through the opening, thereby closing the third port 16. An air inlet interface 331 is provided on the top sleeve 33.

[0025] The regulating mechanism includes a heater 41, a pressure regulating valve 42 and an actuator 43. The heater 41 and the pressure regulating valve 42 are both installed on the section between the air inlet interface 331 and the end opening of the top sleeve 33. The actuator 43 is connected to the rocker arm 300 to drive the rocker arm 300 to rotate, thereby driving the valve transmission shaft 2 to rotate.

[0026] The detection mechanism includes a pressure gas source 51, a gas flow meter 52, a temperature sensor 53 and a pressure sensor 54. The pressure gas source 51 is connected to the air inlet interface 331 of the top sleeve 33 through a pipeline. The gas flow meter 52 is installed on the section between the air inlet interface 331 and the end opening of the top sleeve 33. The temperature sensor 53 and the pressure sensor 54 are both installed on the box body 31. The temperature sensor 53 is used to detect the temperature of the cavity of the box body 31, and the pressure sensor 54 is used to detect the pressure of the cavity of the box body 31.

[0027] The PC 6 is electrically connected to the gas flow meter 52 , the temperature sensor 53 , the pressure sensor 54 , the heater 41 , the pressure regulating valve 42 and the actuator 43 , respectively.

[0028] Preferably, the blocking mechanism further includes a cylinder A34 and a cylinder B35. The telescopic rod of the cylinder A34 is connected to the first end face of the blocking plate 32. When the telescopic rod of the cylinder A34 is extended, the second end face of the blocking plate 32 is pressed against the second port 15 of the volute 1. The telescopic rod of the cylinder B35 abuts against the closed end of the top sleeve. When the telescopic rod of the cylinder B35 is extended, the opening of the top sleeve 33 is pressed against the third port 16 of the volute 1.

[0029] Preferably, along the direction from the air inlet interface 331 of the top sleeve 33 to the end opening, the gas flow meter 52 , the heater 41 and the pressure regulating valve 42 are arranged in sequence and at intervals.

[0030] Preferably, the probe of the temperature sensor 53 and the probe of the pressure sensor 54 respectively pass through the side wall of the box body 31 and enter the cavity of the box body 31, and the probe of the temperature sensor 53 and the side wall of the box body 31 are sealed by glue, and the probe of the pressure sensor 54 and the side wall of the box body 31 are sealed by glue.

[0031] Preferably, the heater 41 is an annular electric heater installed outside the top sleeve 33, and the actuator 43 is a component with a reciprocating linear motion, such as an electric cylinder, a pneumatic cylinder or a hydraulic cylinder.

[0032] Briefly describe the working principle of this utility model:

[0033] The invention discloses a supercharger valve transmission shaft leakage detection method, which is applied to the above-mentioned supercharger valve transmission shaft leakage detection system.

[0034] Before executing the detection method, the operating conditions and evaluation indicators are set. According to the actual operating conditions of the supercharger, multiple groups of operating conditions are set, one group of operating conditions includes the temperature inside the volute and the pressure inside the volute, and each group of operating conditions sets a corresponding group of evaluation indicators, which includes a first threshold value and a second threshold value. The first threshold value is the total leakage at the gap between the valve drive shaft and the volute drive shaft hole per unit time, and the second threshold value is the real-time leakage at the gap between the valve drive shaft and the volute drive shaft hole at any time.

[0035] Here’s how:

[0036] S01, establish the gas path:

[0037] The actuator is actuated to drive the rocker arm to rotate, thereby driving the coaxial bleed valve to rotate, opening the bleed port, thereby connecting the arc-shaped air passage inside the volute with the straight air passage; the air passage at this time includes the pressure air source connected in sequence from front to back - the top sleeve air inlet interface - the top sleeve inner hole - the third port of the volute - the volute arc-shaped air passage - the volute bleed port - the volute straight air passage and the box cavity - the gap between the valve drive shaft and the volute drive shaft hole - the outside of the volute;

[0038] S02, simulated operating conditions:

[0039] A. Start the pressure gas source and the heater at the same time; the pressure gas from the pressure gas source flows along the above-mentioned gas path. Since there is a gap between the valve drive shaft and the volute drive shaft hole, the pressure gas eventually leaks continuously to the outside of the volute through the gap; the pressure gas from the pressure gas source is heated by the heater when passing through the heater, thereby increasing the temperature of the pressure gas entering the volute straight-through airway and the box cavity;

[0040] B. Perform the following two operations in no particular order:

[0041] Ⅰ. When the temperature sensor detects that the temperature in the box cavity is stable, the temperature is adjusted; the temperature adjustment rules are as follows: if the temperature is lower than the set temperature at this time, the PC controls the heater to increase the power to increase the pressure gas temperature; if the temperature is higher than the set temperature at this time, the PC controls the heater to reduce the power to reduce the pressure gas temperature; through the above control process, the temperature in the box cavity reaches and stabilizes at the temperature of the selected working condition, that is, temperature adjustment is achieved;

[0042] Ⅱ. Adjust the pressure regulating valve based on the detection data of the pressure sensor to change the air flow rate entering the volute direct airway and the box cavity. When the pressure sensor detects that the pressure in the box cavity reaches and stabilizes at the pressure of the selected operating condition, pressure regulation is achieved.

[0043] S03, current working condition leakage detection:

[0044] The PC controls the action of the actuator, drives the rocker arm to rotate, and then drives the coaxial bleed valve to rotate back and forth, closing or opening the bleed port to simulate the movement state of the valve drive shaft when the supercharger is running; the PC reads the real-time flow of the gas flow meter, records the real-time leakage at the gap between the valve drive shaft and the volute drive shaft hole, and dynamically counts the total leakage at the gap between the valve drive shaft and the volute drive shaft hole.

[0045] In this step, since the gas supply end in the above-mentioned gas path only includes the pressure gas source, and the exhaust end only includes the gap between the valve drive shaft and the volute drive shaft hole, the real-time flow rate of the gas flowmeter represents the real-time leakage amount at the gap between the valve drive shaft and the volute drive shaft hole.

[0046] S04, current operating condition leakage evaluation:

[0047] If the total leakage per unit time exceeds the first threshold or the real-time leakage at any time exceeds the second threshold, it means that the leakage detection of the valve drive shaft has failed; if the total leakage per unit time does not exceed the first threshold and the real-time leakage at any time does not exceed the second threshold, it means that the leakage detection of the valve drive shaft has passed; the valve drive shaft leakage detection under the current group of operating conditions is now completed.

[0048] In this step, the first threshold and the second threshold are evaluation indicators corresponding to the current group of operating conditions.

[0049] S05, Leakage determination in other working conditions:

[0050] Repeat steps S02-S04 multiple times to complete the valve drive shaft leakage detection under other groups of working conditions; wherein step S02 realizes the temperature and pressure adjustment of the selected working condition, step S03 obtains the detection data of the selected working condition, and step S04 determines whether the leakage detection under the selected working condition is passed.

[0051] Preferably, in step S02, temperature stability means that the temperature change within 1 minute does not exceed 2° C., and pressure stability means that the pressure change within 1 minute does not exceed 0.02 MPa.

Claims

1. A supercharger valve drive shaft leakage detection system, applied to a turbine box assembly; the turbine box assembly includes a volute, a valve drive shaft, a bushing, an air bleed valve and a rocker arm; an arc-shaped air passage and a straight air passage are arranged inside the volute, and an air bleed port is also arranged inside the volute, and the arc-shaped air passage and the straight air passage are connected through the air bleed port; a first port, a second port, a third port and a drive shaft hole are arranged outside the volute, the first port and the second port are respectively connected to the straight air passage and are located at both ends of the straight air passage, the third port is connected to the arc-shaped air passage and is located at one end of the arc-shaped air passage, and the drive shaft hole is connected to the straight air passage; the valve drive shaft is rotatably installed in the drive shaft hole of the volute through the bushing, and one end of the valve drive shaft located inside the volute is connected to the air bleed valve, and one end of the valve drive shaft located outside the volute is connected to the rocker arm; the rotation of the rocker arm drives the coaxial air bleed valve to rotate, thereby blocking or opening the air bleed port; Its characteristics are: Supercharger valve transmission shaft leakage detection system, including blocking mechanism, detection mechanism, adjustment mechanism and PC; The blocking mechanism includes a box body, a blocking plate and a top sleeve; a cavity is provided inside the box body, an opening connected to the cavity is provided at one end of the box body, and the box body is in sealing contact with the first port of the volute through the opening, thereby closing the first port; the end faces of the blocking plate on both sides are respectively defined as the first end face and the second end face, and the blocking plate is in sealing contact with the second port of the volute through the second end face, thereby closing the second port; the top sleeve is a cylindrical component with one end open and the other end closed, and the top sleeve is in sealing contact with the third port of the volute through the opening, thereby closing the third port, and an air inlet interface is provided on the top sleeve; The regulating mechanism includes a heater, a pressure regulating valve and an actuator; the heater and the pressure regulating valve are both installed on the section between the air inlet interface and the end opening of the top sleeve; the actuator is connected to the rocker arm to drive the rocker arm to rotate, thereby driving the valve drive shaft to rotate; The detection mechanism includes a pressure gas source, a gas flow meter, a temperature sensor and a pressure sensor; the pressure gas source is connected to the air inlet interface of the top sleeve through a pipeline; the gas flow meter is installed on the section between the air inlet interface of the top sleeve and the end opening; the temperature sensor and the pressure sensor are both installed on the box body, the temperature sensor is used to detect the temperature of the box body cavity, and the pressure sensor is used to detect the pressure of the box body cavity; The PC is electrically connected to the gas flow meter, the temperature sensor, the pressure sensor, the heater, the pressure regulating valve and the actuator respectively.

2. The supercharger valve drive shaft leakage detection system according to claim 1, characterized in that: The blocking mechanism also includes a cylinder A and a cylinder B; the telescopic rod of cylinder A is connected to the first end face of the blocking plate, and when the telescopic rod of cylinder A is extended, the second end face of the blocking plate is pressed against the second port of the volute; the telescopic rod of cylinder B is abutted against the closed end of the top sleeve, and when the telescopic rod of cylinder B is extended, the opening of the top sleeve is pressed against the third port of the volute.

3. The supercharger valve drive shaft leakage detection system according to claim 2, characterized in that: Along the direction from the air inlet interface of the top sleeve to the end opening, the gas flow meter, the heater and the pressure regulating valve are arranged in sequence at intervals.

4. The supercharger valve transmission shaft leakage detection system according to claim 3, characterized in that: The probe of the temperature sensor and the probe of the pressure sensor respectively pass through the side wall of the box and enter the cavity of the box. The probe of the temperature sensor and the side wall of the box are sealed by glue, and the probe of the pressure sensor and the side wall of the box are sealed by glue.

Images