Blow-through valve drive shaft leak detection system and method

Abstract

The application relates to a turbocharging technical field, and discloses a turbocharger valve drive shaft leakage detection system and a detection method. The detection system is applied to a turbine box assembly; the turbine box assembly comprises a turbine casing, a valve drive shaft, a shaft sleeve, a gas exhaust valve and a rocker arm; the detection system comprises a plugging mechanism, a detection mechanism, an adjusting mechanism and a PC; the plugging mechanism comprises a box body, a plugging plate and a top sleeve; the adjusting mechanism comprises a heater, a pressure regulating valve and an actuator; and the detection mechanism comprises a pressure gas source, a gas flow meter, a temperature sensor and a pressure sensor. The detection method is applied to the detection system; before the detection method is executed, working condition conditions and evaluation indexes are set; the method is as follows: a gas path channel is established; a working condition is simulated; current working condition leakage detection is performed; and current working condition leakage evaluation is performed. The application can simulate the motion state and working environment of the valve drive shaft, detect the leakage amount of the valve drive shaft, and thus evaluate the dynamic sealing performance of the valve drive shaft.

Description

TECHNICAL FIELD

[0001] The present application relates to the turbocharger technical field, and particularly to a turbocharger valve drive shaft leakage detection system and a detection method. BACKGROUND

[0002] The exhaust gas turbocharger technology can effectively save energy and reduce emissions, and is an important way to restore engine power in plateau areas, and is widely used in commercial vehicles, passenger cars and engineering machinery fields. With the application of turbocharging technology, the safety and durability of the turbocharger are also increasingly required.

[0003] The valve drive shaft is an important component in the turbocharger, which is rotatably installed on the volute, one end of which is connected with the air release valve located inside the volute, and the other end is connected with the rocker arm located outside the volute. Under the drive of the actuator of the turbocharger, the rocker arm rotates to drive the coaxial air release valve to rotate, thereby achieving air release or plugging. The specific structure of the valve drive shaft can be referred to the utility model "A Turbocharger Valve Drive Shaft" with the authorization announcement number CN220705805U.

[0004] The installation position of the valve drive shaft on the volute is shown in Figure 2 . Among them, the volute 1 is provided with an arc-shaped air passage 11 and a straight-through air passage 12, and the volute 1 is also provided with an air release port 13, and the arc-shaped air passage 11 and the straight-through air passage 12 are communicated through the air release port 13. The volute 1 is provided with a first port 14, a second port 15, a third port 16 and a drive shaft hole, the first port 14 and the second port 15 are respectively communicated with the straight-through air passage 12 and located at both ends of the straight-through air passage 12, the third port 16 is communicated to the arc-shaped air passage 11 and located at one end of the arc-shaped air passage 11, and the drive shaft hole is communicated with the straight-through 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, one end of which located inside the volute 1 (specifically located in the straight-through air passage 12) is connected with the air release valve 200, and the other end located outside the volute 1 is connected with the rocker arm 300. When the turbocharger is working, the rocker arm 300 is driven to rotate by the actuator (not shown in the figure), and then the coaxial air release valve 200 is rotated, and then the air release port 13 is plugged or opened.

[0005] Since the valve drive shaft needs to work in rotation, it cannot be completely sealed in the axial direction, and when the turbocharger is working, the high-temperature gas in 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. It will raise the temperature of the engine working cabin and worsen the working environment of the engine; 2. If the leakage is too much, it may cause a fire, affecting the safety of the engine and the whole vehicle; 3. High-temperature gas will corrode other working parts of the turbocharger, affecting the service life of the turbocharger.

[0006] Therefore, before the turbocharger is installed and used, the leakage of the valve transmission shaft is tested and evaluated, which is a problem to be solved at present. SUMMARY

[0007] The present application aims to overcome the deficiencies of the prior art and provide a turbocharger valve transmission shaft leakage detection system and method, which can simulate the working environment (pressure and temperature) of the valve transmission shaft, detect the leakage of the valve transmission shaft, and thus evaluate the dynamic sealing performance of the valve transmission shaft.

[0008] The technical solution of the present application is: a turbocharger valve transmission shaft leakage detection system applied to a turbine box assembly; the turbine box assembly includes a volute, a valve transmission shaft, a shaft sleeve, a bleed valve and a rocker arm; the volute is internally provided with an arc-shaped air passage and a straight-through air passage, and is further provided with a bleed port, and the arc-shaped air passage and the straight-through air passage are communicated through the bleed port; the volute is externally provided with a first port, a second port, a third port and a transmission shaft hole, the first port and the second port are respectively communicated with the straight-through air passage and located at both ends of the straight-through air passage, the third port is communicated with the arc-shaped air passage and located at one end of the arc-shaped air passage, and the transmission shaft hole is communicated with the straight-through air passage; the valve transmission shaft is rotatably installed in the transmission shaft hole of the volute through the shaft sleeve, one end thereof located inside the volute is connected with the bleed valve, and the other end thereof located outside the volute is connected with the rocker arm; the rocker arm rotates to drive the coaxial bleed valve to rotate, thereby plugging or opening the bleed port;

[0009] The turbocharger valve transmission shaft leakage detection system comprises a plugging mechanism, a detection mechanism, an adjusting mechanism and a PC.

[0010] The plugging mechanism comprises a box body, a plugging plate and a top sleeve; the box body is internally provided with a cavity, one end of the box body is provided with an opening communicated with the cavity, and the box body is in sealed contact with the first port of the volute through the opening, thereby closing the first port; the two side end faces of the plugging plate are defined as a first end face and a second end face, the plugging plate is in sealed contact with the second port of the volute through the second end face, thereby closing the second port; the top sleeve is a cylindrical member with one end open and the other end closed, the top sleeve is in sealed contact with the third port of the volute through the opening, thereby closing the third port, and the top sleeve is provided with an air inlet interface;

[0011] The adjusting mechanism comprises 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 open end of the top sleeve; the actuator is connected with the rocker arm to drive the rocker arm to rotate, thereby driving the valve transmission shaft to rotate;

[0012] The detection mechanism comprises a pressure gas source, a gas flow meter, a temperature sensor and a pressure sensor; the pressure gas source is communicated with the gas inlet interface of the top sleeve through a pipeline; the gas flow meter is installed on the section between the gas 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 for detecting the temperature of the cavity of the box body, and the pressure sensor is used for detecting the pressure of the cavity of the box body;

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

[0014] The further technical scheme of the present application is that the plugging mechanism further comprises a cylinder A and a cylinder B; the telescopic rod of the cylinder A is connected with the first end face of the plugging plate, and when the telescopic rod of the cylinder A is extended, the second end face of the plugging plate is pressed tightly on the second port of the volute; the telescopic rod of the cylinder B is abutted with the closed end of the top sleeve, and when the telescopic rod of the cylinder B is extended, the opening of the top sleeve is pressed tightly on the third port of the volute.

[0015] The further technical scheme of the present application is that along the direction from the gas inlet interface to the end opening of the top sleeve, the gas flow meter, the heater and the pressure regulating valve are arranged in sequence and at intervals.

[0016] The further technical scheme of the present application is that the probe of the temperature sensor and the probe of the pressure sensor respectively pass through the side wall of the box body into the cavity of the box body, the probe of the temperature sensor is sealed by glue between the side wall of the box body, and the probe of the pressure sensor is sealed by glue between the side wall of the box body.

[0017] The technical scheme of the present application is that the booster valve transmission shaft leakage detection method is applied to the booster valve transmission shaft leakage detection system;

[0018] Before the detection method is performed, the working condition and the evaluation index are set;

[0019] According to the actual operation condition of the booster, a plurality of working conditions are set, one working condition comprises the temperature inside the volute and the pressure inside the volute, one set of evaluation indexes is set corresponding to each working condition, one set of evaluation indexes comprises a first threshold value and a second threshold value, the first threshold value is the total leakage amount of the gap between the valve transmission shaft and the volute transmission shaft hole per unit time, and the second threshold value is the real-time leakage amount of the gap between the valve transmission shaft and the volute transmission shaft hole at any moment;

[0020] The method is as follows:

[0021] S01, a gas path channel is established:

[0022] The actuator is actuated to drive the rocker arm to rotate, and then drive the coaxial air release valve to rotate, so as to open the air release port, thereby connecting the arc-shaped air passage and the straight-through air passage in the volute; at this time, the gas passage includes the pressure gas source, the top sleeve air inlet, the top sleeve inner hole, the third port of the volute, the arc-shaped air passage of the volute, the air release port of the volute, the straight-through air passage of the volute, the cavity of the box body, the gap between the valve transmission shaft and the volute transmission shaft hole, and the outside of the volute.

[0023] S02, simulate the operating condition:

[0024] A, simultaneously start the pressure gas source and the heater; the pressure gas from the pressure gas source flows along the above-mentioned gas passage, and since there is a gap between the valve transmission shaft and the volute transmission shaft hole, the pressure gas finally continuously leaks 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, so that the temperature of the pressure gas entering the straight-through air passage of the volute and the cavity of the box body is increased;

[0025] B, the following two operations are performed without any sequence:

[0026] I, when the temperature sensor detects that the temperature in the cavity of the box body is stable, temperature adjustment is performed; the temperature adjustment rule is as follows: if the temperature is lower than the set temperature at this time, the PC controls the heater to increase the power, so that the temperature of the pressure gas is increased; if the temperature is higher than the set temperature at this time, the PC controls the heater to decrease the power, so that the temperature of the pressure gas is decreased; through the above-mentioned regulation and control process, the temperature in the cavity of the box body reaches and stabilizes at the temperature of the selected operating condition, that is, temperature adjustment is achieved;

[0027] II, based on the detection data of the pressure sensor, the pressure regulating valve is adjusted, so that the gas flow entering the straight-through air passage of the volute and the cavity of the box body is changed; when the pressure sensor detects that the pressure in the cavity of the box body reaches and stabilizes at the pressure of the selected operating condition, pressure adjustment is achieved;

[0028] S03, current operating condition leakage detection:

[0029] The PC controls the actuator to be actuated to drive the rocker arm to rotate, and then drive the coaxial air release valve to reciprocate, so as to close or open the air release port, so as to simulate the movement state of the valve transmission shaft when the supercharger is running; the PC records the real-time leakage amount at the gap between the valve transmission shaft and the volute transmission shaft hole by reading the real-time flow of the gas flow meter, and dynamically counts the total leakage amount at the gap between the valve transmission shaft and the volute transmission shaft hole;

[0030] S04, current operating condition leakage evaluation:

[0031] If the total leakage amount in unit time exceeds the first threshold value or the real-time leakage amount at any time exceeds the second threshold value, it represents that the leakage detection of the valve transmission shaft fails; if the total leakage amount in unit time does not exceed the first threshold value and the real-time leakage amount at any time does not exceed the second threshold value, it represents that the leakage detection of the valve transmission shaft passes; thus, the leakage detection of the valve transmission shaft under the current group of working conditions is completed.

[0032] In the step, the first threshold value and the second threshold value are evaluation indexes corresponding to the current group of working conditions.

[0033] The further technical solution of the present application is that it further comprises a step S05 connected after the step S04.

[0034] S05, leakage determination under other working conditions:

[0035] The steps S02-S04 are repeatedly performed for multiple times to complete the leakage detection of the valve transmission shaft under other groups of working conditions; wherein, the step S02 realizes the temperature and pressure adjustment of the selected working conditions, the step S03 obtains the detection data of the selected working conditions, and the step S04 determines whether the leakage detection under the selected working conditions passes.

[0036] The further technical solution of the present application is that in the step S02, the temperature stability refers to that the temperature change within 1 min does not exceed 2℃, and the pressure stability refers to that the pressure change within 1 min does not exceed 0.02 MPa.

[0037] Compared with the prior art, the present application has the following advantages:

[0038] It can simulate the motion state and working environment (pressure and temperature) of the valve transmission shaft, detect the leakage amount of the valve transmission shaft, realize the evaluation of the dynamic sealing performance of the valve transmission shaft, and further improve the controllability of the quality of the supercharger product.

[0039] The present application is further described below in combination with the drawings and embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0040] Figure 1 It is a structural schematic diagram of the present application.

[0041] Figure 2 It is an installation position diagram of the valve transmission shaft on the volute.

[0042] Legend: Volute 1; curved air duct 11; straight air duct 12; bleed 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 port 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; bleed valve 200; rocker arm 300. DETAILED DESCRIPTION Example 1

[0043] like Figures 1-2 As shown, the supercharger valve drive shaft leakage detection system is applied to the turbine case assembly.

[0044] like Figure 2 As shown, the turbine housing assembly includes a volute 1, a valve drive shaft 2, a sleeve 100, a bleed valve 200, and a rocker arm 300. The volute 1 is provided with an arcuate air passage 11 and a straight air passage 12 inside. The volute 1 is also provided with a bleed port 13, and the arcuate air passage 11 and the straight air passage 12 are connected through the bleed port 13. The volute 1 is provided with a first port 14, a second port 15, a third port 16, and a drive shaft hole outside. 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 arcuate air passage 11 and is located at one end of the arcuate air passage 11. The drive shaft hole is connected to the straight air passage 12. The valve drive shaft 2 is rotatably mounted in the drive shaft hole of the volute 1 via the sleeve 100. The end located inside the volute 1 is connected to the bleed valve 200, and the end located outside the volute 1 is connected to the rocker arm 300. The rotation of the rocker arm 300 drives the coaxial vent valve 200 to rotate, thereby blocking or opening the vent port 13 .

[0045] like Figure 1 As shown, the supercharger valve transmission shaft leakage detection system includes a blocking mechanism, a detection mechanism, an adjustment mechanism and a PC 6.

[0046] 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 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.

[0047] The adjusting mechanism comprises 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 gas inlet interface 331 and the end opening of the top sleeve 33. The actuator 43 is connected with the rocker arm 300 to drive the rocker arm 300 to rotate, thereby driving the valve transmission shaft 2 to rotate.

[0048] The detecting mechanism comprises 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 communicated with the gas inlet interface 331 of the top sleeve 33 through a pipeline. The gas flow meter 52 is installed on the section between the gas 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 31, the temperature sensor 53 is used to detect the temperature of the cavity of the box 31, and the pressure sensor 54 is used to detect the pressure of the cavity of the box 31.

[0049] The PC 6 is electrically connected with 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.

[0050] Preferably, the blocking mechanism further comprises a cylinder A 34 and a cylinder B 35. The telescopic rod of the cylinder A 34 is connected with the first end face of the blocking plate 32, and when the telescopic rod of the cylinder A 34 is extended, the second end face of the blocking plate 32 is pressed tightly on the second port 15 of the volute 1. The telescopic rod of the cylinder B 35 abuts against the closed end of the top sleeve, and when the telescopic rod of the cylinder B 35 is extended, the opening of the top sleeve 33 is pressed tightly on the third port 16 of the volute 1.

[0051] Preferably, the gas flow meter 52, the heater 41 and the pressure regulating valve 42 are arranged in sequence and spaced apart along the direction from the gas inlet interface 331 to the end opening of the top sleeve 33.

[0052] 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 31 into the cavity of the box 31, and the probe of the temperature sensor 53 is sealed with the side wall of the box 31 by glue, and the probe of the pressure sensor 54 is sealed with the side wall of the box 31 by glue.

[0053] Preferably, the heater 41 is an annular electric heater installed outside the top sleeve 33, and the actuator 43 is a component with reciprocating linear motion mode, such as an electric cylinder, a gas cylinder or a hydraulic cylinder.

[0054] Briefly describe the working principle of the present application:

[0055] The booster valve transmission shaft leakage detection method is applied to the booster valve transmission shaft leakage detection system.

[0056] Before the detection method is executed, working condition and evaluation index are set. According to the actual operation condition of the supercharger, a plurality of groups of working conditions are set, and each group of working conditions includes the temperature in the volute and the pressure in the volute. Each group of working conditions is set to correspond to a group of evaluation indexes, and each group of evaluation indexes includes a first threshold value and a second threshold value. The first threshold value is the total leakage amount per unit time at the gap between the valve transmission shaft and the volute transmission shaft hole, and the second threshold value is the real-time leakage amount at the gap between the valve transmission shaft and the volute transmission shaft hole at any moment.

[0057] The method is as follows:

[0058] S01, establish a gas path channel:

[0059] The actuator is actuated to drive the rocker arm to rotate, and then drive the coaxial gas exhaust valve to rotate, so as to open the gas exhaust port, thereby connecting the arc-shaped gas passage and the straight-through gas passage in the volute. At this time, the gas path channel includes, in sequence from front to back, a pressure gas source, a top sleeve air inlet, a top sleeve inner hole, a volute third port, a volute arc-shaped gas passage, a volute gas exhaust port, a volute straight-through gas passage and a cavity of a box body, a gap between the valve transmission shaft and the volute transmission shaft hole, and a volute exterior;

[0060] S02, simulate the working condition:

[0061] A, simultaneously start the pressure gas source and the heater; the pressure gas from the pressure gas source flows along the above-mentioned gas path channel, and since there is a gap between the valve transmission shaft and the volute transmission shaft hole, the pressure gas eventually continuously leaks to the volute exterior through the gap; the pressure gas from the pressure gas source is heated by the heater when passing through the heater, so that the temperature of the pressure gas entering the volute straight-through gas passage and the cavity of the box body is increased;

[0062] B, the following two operations are performed in no particular order:

[0063] I. When the temperature sensor detects that the temperature in the cavity of the box body is stable, temperature adjustment is performed; the temperature adjustment rule is as follows: if the temperature at this time is lower than the set temperature, the PC controls the heater to increase the power, so that the temperature of the pressure gas is increased, and if the temperature at this time is higher than the set temperature, the PC controls the heater to reduce the power, so that the temperature of the pressure gas is reduced; through the above-mentioned regulation and control process, the temperature in the cavity of the box body reaches and stabilizes at the temperature of the selected working condition, that is, temperature adjustment is achieved;

[0064] II. Based on the detection data of the pressure sensor, the pressure regulating valve is adjusted to change the gas flow entering the volute straight-through gas passage and the cavity of the box body, and when the pressure sensor detects that the pressure in the cavity of the box body reaches and stabilizes at the pressure of the selected working condition, pressure regulation is achieved.

[0065] S03, current working condition leakage detection:

[0066] The PC controls the actuator to move, drives the rocker arm to rotate, and further drives the coaxial exhaust valve to reciprocate, so as to close or open the exhaust port, so as to simulate the movement state of the valve transmission shaft during the operation of the supercharger; the PC records the real-time leakage amount at the gap between the valve transmission shaft and the volute transmission shaft hole by reading the real-time flow of the gas flow meter, and dynamically counts the total leakage amount at the gap between the valve transmission shaft and the volute transmission shaft hole.

[0067] In this step, since the gas supply end in the above-mentioned gas path channel only includes the pressure source, and the gas exhaust end only includes the gap between the valve transmission shaft and the volute transmission shaft hole, the real-time flow of the gas flow meter represents the real-time leakage amount at the gap between the valve transmission shaft and the volute transmission shaft hole.

[0068] S04, current working condition leakage evaluation:

[0069] If the total leakage amount in a unit time exceeds the first threshold value or the real-time leakage amount at any time exceeds the second threshold value, it means that the leakage detection of the valve transmission shaft fails; if the total leakage amount in a unit time does not exceed the first threshold value and the real-time leakage amount at any time does not exceed the second threshold value, it means that the leakage detection of the valve transmission shaft passes; thus, the leakage detection of the valve transmission shaft under the current group of working conditions is completed.

[0070] In this step, the first threshold value and the second threshold value are evaluation indexes corresponding to the current group of working conditions.

[0071] S05, other working condition leakage determination:

[0072] The steps S02-S04 are repeated multiple times to complete the leakage detection of the valve transmission shaft under other groups of working conditions; wherein, the step S02 realizes the temperature and pressure adjustment of the selected working conditions, the step S03 obtains the detection data of the selected working conditions, and the step S04 determines whether the leakage detection under the selected working conditions passes.

[0073] Preferably, in the step S02, the temperature stability means that the temperature change within 1 min does not exceed 2℃, and the pressure stability means that the pressure change within 1 min does not exceed 0.02MPa.

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, a bleed valve and a rocker arm; an arc-shaped air passage and a straight air passage are provided inside the volute, and an air bleed port is also provided 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 provided 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, one end of which is located inside the volute is connected to the air bleed valve, and the other end of which is 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 drive shaft leakage detection system, including a blocking mechanism, a detection mechanism, an adjustment mechanism and a PC; The sealing mechanism includes a box body, a blocking plate and a top sleeve; a cavity is provided inside the box body, and 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 sealing the first port; the end faces of the blocking plate 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 sealing 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 sealing 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 in 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 in 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 cavity, and the pressure sensor is used to detect the pressure of the box cavity; the probe of the temperature sensor and the probe of the pressure sensor respectively pass through the side wall of the box body and enter the box cavity, and the probe of the temperature sensor and the probe of the pressure sensor are sealed with glue to the side wall of the box body. 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, wherein: The sealing mechanism also includes cylinder A and 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. A method for detecting leakage of a supercharger valve transmission shaft, applied to a supercharger valve transmission shaft leakage detection system according to any one of claims 1 to 2; Its characteristics are: Before executing the detection method, the working conditions and evaluation indicators are set; Multiple groups of operating conditions are set according to the actual operating conditions of the supercharger, 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. Here’s how: S01, establish the gas path: The actuator operates, driving the rocker arm to rotate, which in turn drives 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, from front to back, the pressure air source, the top sleeve air inlet interface, the top sleeve inner hole, the volute third port, the volute arc-shaped air passage, the volute bleed port, the volute straight air passage and the housing cavity, the gap between the valve drive shaft and the volute drive shaft hole, and the outside of the volute. S02, simulated operating conditions: A. Simultaneously start the pressure gas source and the heater. The pressure gas from the pressure gas source flows along the aforementioned gas path. Due to the gap between the valve drive shaft and the volute drive shaft hole, the pressure gas eventually leaks out of the volute through the gap. When the pressure gas from the pressure gas source passes through the heater, it is heated by the heater and its temperature rises, thereby increasing the temperature of the pressure gas entering the volute direct airway and the housing cavity. B. Perform the following two operations in no particular order: Ⅰ. When the temperature sensor detects that the temperature inside 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, the PC controls the heater to increase the power to increase the pressure gas temperature. If the temperature is higher than the set temperature, 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, thus achieving temperature adjustment. II. Adjust the pressure regulating valve based on the detection data of the pressure sensor to change the air flow rate entering the volute straight 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 working condition, pressure regulation is achieved; S03, current working condition leakage detection: The PC controls the actuator, driving the rocker arm to rotate, which in turn drives the coaxial bleed valve to reciprocate, closing or opening the bleed port to simulate the motion of the valve drive shaft during supercharger operation. The PC reads the real-time flow rate from 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 calculates the total leakage at the gap between the valve drive shaft and the volute drive shaft hole. S04, current operating condition leakage evaluation: If the total leakage volume per unit time exceeds the first threshold or the real-time leakage volume at any moment exceeds the second threshold, it means that the valve drive shaft leakage test has failed. If the total leakage volume per unit time does not exceed the first threshold and the real-time leakage volume at any moment does not exceed the second threshold, it means that the valve drive shaft leakage test has passed. This completes the valve drive shaft leakage test under the current set of working conditions. In this step, the first threshold and the second threshold are evaluation indicators corresponding to the current group of operating conditions.

4. The method for detecting leakage of a supercharger valve transmission shaft according to claim 3, wherein: It also includes step S05 following step S04; S05, Leakage determination in other working conditions: 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 conditions, step S03 obtains the detection data of the selected working conditions, and step S04 determines whether the leakage detection under the selected working conditions is passed.

5. The method for detecting leakage of a supercharger valve transmission shaft according to claim 4, wherein: 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.

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