CN111076910A - Test system and test method for checking nozzle brazing qualification - Google Patents
Test system and test method for checking nozzle brazing qualification Download PDFInfo
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Abstract
The invention provides a test system and a test method for detecting nozzle brazing qualification. The system comprises an air source, a pressure reducer, a first pressure sensor, a sonic throttling orifice plate, a second pressure sensor, a nozzle back-blowing assembly and a nozzle mounting assembly; the nozzle comprises a nozzle inner shell and a nozzle outer shell which are connected in a brazing mode, and the gas source, the pressure reducer, the first pressure sensor and the sonic throttling orifice plate are sequentially connected through a pipeline; the second pressure sensor is arranged at the outlet of the sonic throttling orifice plate; the nozzle mounting assembly comprises a fixed cylinder and a positioning sleeve; the nozzle back-blowing assembly comprises an inner shell back-blowing device and an outer shell back-blowing device; when the inner shell of the nozzle is tested, the inner shell blowback device is arranged in the nozzle; when the outer shell of the nozzle is tested, the outer shell blowback device is arranged in the nozzle.
Description
Technical Field
The invention relates to a nozzle test system, in particular to a test system and a test method for checking nozzle brazing qualification.
Background
The nozzle is applied to an aerogenerator and a thrust chamber of a rocket engine, as shown in fig. 1, the nozzle 4 comprises a nozzle inner shell 41 and a nozzle outer shell 42, wherein a plurality of tangential holes arranged along the circumferential direction are arranged on the nozzle inner shell 41 and the nozzle outer shell 42, the nozzle inner shell and the nozzle outer shell are generally connected by brazing, the tangential holes are machined before brazing, but after brazing, the tangential holes are easily blocked by welding slag or other impurities, so that the flow passing through the nozzle is changed, and the combustion flow field of the rocket engine is unevenly distributed to cause ablation problems.
Disclosure of Invention
The invention provides a test system and a test method for inspecting nozzle brazing qualification.
In order to achieve the purpose, the invention adopts the technical scheme that:
a test system for checking nozzle brazing qualification comprises a gas source, a pressure reducer, a first pressure sensor, a sonic throttling orifice plate, a second pressure sensor, a nozzle back-blowing assembly and a nozzle mounting assembly; the nozzle comprises a nozzle inner shell and a nozzle outer shell which are connected in a brazing mode, and the gas source, the pressure reducer, the first pressure sensor and the sonic throttling orifice plate are sequentially connected through a pipeline; the second pressure sensor is arranged at an outlet of the sonic throttling orifice plate; the nozzle mounting assembly comprises a fixed cylinder and a positioning sleeve, and an exhaust hole for exhausting is formed in the side surface of the fixed cylinder; the nozzle outer shell is positioned in the fixed cylinder, and the bottom of the nozzle outer shell penetrates through a bottom plate of the fixed cylinder; the nozzle back-blowing assembly comprises an inner shell back-blowing device and an outer shell back-blowing device; when the inner shell of the nozzle is tested, the inner shell back blowing device is arranged in the nozzle, the air inlet is connected with the outlet of the sonic throttling orifice plate through a tail end pipeline, the air outlet is communicated with the tangential hole of the inner shell of the nozzle, and the tangential hole of the outer shell of the nozzle is blocked; when the outer shell of the nozzle is tested, the outer shell back blowing device is arranged in the nozzle, the air inlet is connected with an outlet of the sonic throttling orifice plate through a tail end pipeline, the air outlet is communicated with a tangential hole of the outer shell of the nozzle, and the tangential hole of the inner shell of the nozzle is blocked.
Further, a sealing gasket is arranged on the contact surface of the nozzle outer shell and the fixed cylinder.
Furthermore, the inner shell body blowback device is of a sleeve structure, the sleeve is arranged in the nozzle outer shell body, the top end of the sleeve is provided with a positioning groove, one end of the nozzle inner shell body is nested in the positioning groove, and the outer wall of the positioning groove plugs the tangential hole of the nozzle outer shell body.
Further, shell body blowback device is ladder rod structure, including first pole section, second pole section and the third pole section that the diameter increases in proper order, first pole section is sealed to be set up in the nozzle inner casing, the second pole section sets up in the nozzle outer casing, and inside is provided with the blind hole of ventilating, is provided with the discharge orifice that will ventilate blind hole and nozzle outer casing tangential hole intercommunication on the lateral wall, the third pole section sets up in the nozzle outer casing, and inside is provided with the through-hole of ventilating that will ventilate blind hole and terminal pipeline intercommunication.
Furthermore, a sealing ring is arranged on a contact surface between the first rod section and the inner shell of the nozzle, and a sealing ring is arranged on a contact surface between the third rod section and the outer shell of the nozzle.
Furthermore, a filter and a valve are arranged on an outlet pipeline of the air source.
Further, the top end of the first rod segment is provided in a circular shape.
Meanwhile, the invention provides a test method for inspecting nozzle brazing qualification, which comprises the following steps:
step one, selecting a sound velocity throttle orifice;
1.1) calculating the effective sectional area of an orifice on a sound velocity throttling orifice plate according to the set pressure and the set flow;
qV＝113SP1×(273/T1)1/2
wherein: q. q.sV-setting a flow rate;
s-effective cross-sectional area;
P1-a set pressure;
T1-absolute temperature;
1.2) calculating the radius of the throttling hole according to the effective sectional area obtained in the step 1.1);
1.3) selecting a sonic throttling orifice plate according to the throttling radius calculated in the step 1.2);
step two, installing a test system;
the air source, the pressure reducer, the first pressure sensor and the sonic throttling orifice plate are sequentially connected through a pipeline; arranging a second pressure sensor at an outlet of the sonic throttling orifice plate; fixedly mounting the nozzle to be tested through a nozzle mounting component;
measuring the pressure of the inner shell of the tested nozzle;
3.1) arranging a back flushing device of the inner shell in the tested nozzle, connecting the air inlet with an outlet of the sonic throttling orifice plate through a tail end pipeline, communicating the air outlet with a tangential hole of the inner shell of the tested nozzle, and plugging the tangential hole of the outer shell of the tested nozzle;
3.2) opening a gas source, and adjusting a pressure value through a pressure reducer;
3.3) reading the pressure value of the second pressure sensor when the pressure value of the first pressure sensor is the set pressure;
3.4) if the pressure value read in the step 3.3) is within the required range, the inner shell of the tested nozzle is qualified, and if the pressure value is not within the range, the inner shell of the tested nozzle is unqualified;
measuring the pressure of the outer shell of the nozzle to be measured;
4.1) arranging a back flushing device of the outer shell in the tested nozzle, connecting the air inlet with an outlet of the sonic throttling orifice plate through a tail end pipeline, communicating the air outlet with a tangential hole of the outer shell of the tested nozzle, and plugging the tangential hole of the inner shell of the tested nozzle;
4.2) opening a gas source, and adjusting a pressure value through a pressure reducer;
4.3) reading the pressure value of the second pressure sensor when the pressure value of the first pressure sensor is the set pressure;
4.4) if the pressure value read in the step 4.3) is within the required range, the outer shell of the tested nozzle is qualified, and if the pressure value is not within the range, the outer shell of the tested nozzle is unqualified.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a test system and a test method for detecting nozzle brazing qualification, the system has simple principle and convenient and reliable measurement, meets the detection requirement of whether the tangential holes of a generator and a thrust chamber nozzle are blocked before and after brazing, and detects the brazed nozzle, so that the nozzle qualified in detection is applied to a rocket engine, and the problem of ablation caused by uneven distribution of a combustion flow field of the rocket engine is avoided.
Drawings
FIG. 1 is a view showing a structure of a conventional nozzle;
FIG. 2 is a schematic diagram of a test system for inspecting nozzle braze pass in accordance with the present invention;
FIG. 3 is a schematic view of an installation of the back flushing device of the inner housing of the present invention;
FIG. 4 is a schematic view of the installation of the back-blowing device of the outer casing of the present invention;
FIG. 5 is a schematic structural diagram of an inner housing blowback apparatus according to the present invention;
FIG. 6 is a schematic structural diagram of the outer casing blowback apparatus of the present invention.
Reference numerals: 1-a fixed cylinder, 2-an inner shell body blowback device, 3-an outer shell body blowback device, 4-a nozzle, 5-a positioning sleeve, 6-a sealing gasket, 7-an air source, 8-a pressure reducer, 9-a first pressure sensor, 10-a sonic orifice plate, 11-a second pressure sensor, 12-a filter, 13-a valve, 14-a sealing ring, 101-an exhaust hole, 21-a positioning groove, 31-a first rod section, 32-a second rod section, 33-a third rod section, 34-a ventilation blind hole, 35-an overflowing hole, 36-a ventilation through hole, 41-a nozzle inner shell body, 42-a nozzle outer shell body, 43-a tangential hole of the nozzle inner shell body and 44-a tangential hole of the nozzle outer shell body.
Detailed Description
The technical scheme of the invention is explained in detail in the following with the accompanying drawings and the detailed description.
The invention installs the brazed inner and outer nozzle shells in a test system, measures the reverse blowing pressure of the nozzle under the condition of ensuring the pressure at the inlet of the sonic orifice plate, and measures the back blowing pressure of the nozzle, thus knowing whether the tangential holes of the inner nozzle shell and the outer nozzle shell are blocked or not, and ensuring the constant medium flow passing through the system in the process. However, the flow rate passing through the nozzle is a minute flow rate, and at present, no appropriate flow meter is used for measuring the minute flow rate, and when a plurality of products are measured, the flow meter needs to be adjusted repeatedly, so that the operation is complicated. Based on this, the invention requires that the measured air flow is realized by the sonic orifice plate, i.e. the inlet pressure of the sonic orifice plate is guaranteed to guarantee the air flow through the product (at a certain inlet pressure, the flow through the sonic orifice plate is constant).
As shown in fig. 1 to 6, the invention provides a test system for checking nozzle brazing qualification, which comprises an air source 7, a pressure reducer 8, a first pressure sensor 9, a sonic orifice plate 10, a second pressure sensor 11, a nozzle blowback assembly and a nozzle mounting assembly; the air source 7, the pressure reducer 8, the first pressure sensor 9 and the sound velocity orifice plate 10 are sequentially connected through a pipeline, the second pressure sensor 11 is arranged at an outlet of the sound velocity orifice plate 10, and a filter 12 and a valve 13 are arranged on an outlet pipeline of the air source 7.
The nozzle mounting assembly comprises a fixed cylinder 1 and a positioning sleeve 5, and an exhaust hole 101 for exhausting is formed in the side face of the fixed cylinder 1. The nozzle inner shell 41 is positioned in the fixed cylinder 1, the top of the nozzle inner shell 41 is arranged at the top end of the fixed cylinder 1 through the positioning sleeve 5, the nozzle outer shell 42 is positioned in the fixed cylinder 1, and the bottom of the nozzle outer shell 42 penetrates through the bottom plate of the fixed cylinder 1; and a sealing gasket 6 is arranged on the contact surface of the nozzle outer shell 42 and the fixed cylinder 1 to realize sealing connection. The fixed cylinder 1 is fixed on the fixed seat through bolts and nuts, the support stability of the fixed cylinder is guaranteed, and when the fixed cylinder is tested, the nozzle 4 is installed on the fixed cylinder 1 through the positioning sleeve 5 and the sealing gasket 6, so that the nozzle is guaranteed not to deflect vertically, and the outer surface of the nozzle is protected from being scratched.
The nozzle back-blowing assembly comprises an inner shell back-blowing device 2 and an outer shell back-blowing device 3; when the inner shell 41 of the nozzle is tested, the inner shell back blowing device 2 is arranged in the nozzle 4, the air inlet is connected with the outlet of the sonic throttling orifice plate 10 through a tail end pipeline, the air outlet is communicated with the tangential hole 43 of the inner shell of the nozzle, and the tangential hole 44 of the outer shell of the nozzle is blocked; when the nozzle outer shell 42 is tested, the outer shell back-blowing device 3 is arranged in the nozzle 4, the air inlet is connected with the outlet of the sonic throttling orifice plate 10 through a tail end pipeline, the air outlet is communicated with the tangential hole 44 of the nozzle outer shell and plugs the tangential hole 43 of the nozzle inner shell, and the structures of the inner shell back-blowing device 2 and the outer shell back-blowing device 3 are explained in detail below.
As shown in fig. 3 and 5, the inner casing blowback device 2 is a sleeve structure, the sleeve is arranged in the nozzle outer casing 42, the top end of the sleeve is provided with the positioning groove 21, one end of the nozzle inner casing 41 is nested in the positioning groove 21, and the outer wall of the positioning groove 21 blocks the tangential hole 44 of the nozzle outer casing.
As shown in fig. 4, the outer casing blowback device 3 is of a stepped rod structure, and includes a first rod segment 31, a second rod segment 32 and a third rod segment 33, the diameters of which are sequentially increased, the first rod segment 31 is hermetically arranged in the nozzle inner casing 41, the second rod segment 32 is arranged in the nozzle outer casing 42, a blind ventilation hole 34 is arranged inside the blind ventilation hole, a cross-flow hole 35 for communicating the blind ventilation hole 34 with a tangential hole of the nozzle outer casing 42 is arranged on the side wall, the third rod segment 33 is arranged in the nozzle outer casing 42, and a through ventilation hole 36 for communicating the blind ventilation hole 34 with a terminal pipeline is arranged inside the third rod segment 33. The first rod section 31 is provided with a sealing ring 14 on the contact surface with the inner shell 41 of the nozzle, and the third rod section 33 is provided with a sealing ring 14 on the contact surface with the outer shell 42 of the nozzle. The top end of the first rod section 31 is round, so that the outer shell blowback device 3 can be conveniently inserted into the nozzle 4. The sealing ring 14 is matched with the inner diameter of the nozzle outer shell 42 to ensure that gas entering the nozzle outer shell 42 does not leak from the end face of a product outlet, the sealing ring 14 is matched with the end face of a blowing inlet of the nozzle inner shell 41 to protect the sealing ring from being crushed, and the gas entering the outer shell is ensured to completely flow out from a tangential hole of the outer shell.
The system can be applied to the inspection of tangential holes before and after brazing of the nozzles 4 of various types of generators and thrust chambers of rocket engines, in the process of developing the generators and the thrust chambers, the nozzles 4 with qualified liquid flow need to be subjected to a blowing test to obtain the gas flow parameter of the nozzles, and the gas flow parameter is compared with the gas flow data of the nozzles 4 brazed on the generator bottom assembly or the thrust chamber injector so as to find out the change of the flow of the inner shell and the outer shell of the nozzle 4 caused by brazing deformation or filler metal filling the tangential holes of the nozzle 4.
The invention changes the airflow measurement which can not be directly measured into the following steps: and ensuring the gas flow passing through the product by ensuring the inlet pressure of the sonic throttling orifice plate according to the gas flow required to be measured, carrying out back blowing on the nozzle from the nozzle outlet, and comparing and checking the measured back blowing pressure value to judge whether the structure size of the tangential holes of the nozzle before and after brazing changes or is blocked.
The system is provided with the sonic throttling orifice plate, the aperture of the sonic throttling orifice plate 10 under the given flow and the inlet pressure is deduced by calculation under the conditions of compressible gas, flow velocity in a sonic velocity region and the like, so that the gas flow passing through the product is ensured, the problem that the micro gas flow cannot be directly measured is solved, and a reliable basis is provided for the development of a generator and a thrust chamber.
Meanwhile, the invention also provides a test method for checking the nozzle brazing qualification, which comprises the following steps:
step one, selecting a sound velocity throttle orifice 10;
1.1) calculating the effective sectional area of an orifice on a sonic orifice plate 10 according to the set pressure and the set flow;
qV＝113SP1×(273/T1)1/2
wherein: q. q.sV-setting a flow rate;
s-effective cross-sectional area;
P1-a set pressure;
T1-absolute temperature;
1.2) calculating the radius of the throttling hole according to the effective sectional area obtained in the step 1.1), and easily calculating the radius of a circle when the area of the circle is known;
1.3) selecting a sonic throttling orifice plate 10 according to the throttling radius calculated in the step 1.2);
step two, installing a test system;
the testing system comprises an air source 7, a pressure reducer 8, a first pressure sensor 9, a sonic throttling orifice plate 10, a second pressure sensor 11, a nozzle back-blowing assembly and a nozzle mounting assembly; the air source 7, the pressure reducer 8, the first pressure sensor 9 and the sonic throttling orifice plate 10 are sequentially connected through a pipeline; the second pressure sensor 11 is arranged at the outlet of the sonic orifice plate 10; the tested nozzle 4 is fixedly installed through a nozzle installation component; the nozzle back-blowing assembly comprises an inner shell back-blowing device 2 and an outer shell back-blowing device 3;
measuring the pressure of the inner shell 41 of the nozzle to be measured;
3.1) arranging the inner shell blowback device 2 in the tested nozzle 4, connecting the air inlet with the outlet of the sonic throttling orifice plate 10 through a tail end pipeline, communicating the air outlet with the tangential hole 43 of the inner shell of the tested nozzle, and plugging the tangential hole 44 of the outer shell of the tested nozzle;
3.2) opening an air source 7, and adjusting the pressure value through a pressure reducer 8;
3.3) when the pressure value of the first pressure sensor 9 is the set pressure, reading the pressure value of the second pressure sensor 11;
3.4) if the pressure value read in the step 3.3) is within the required range, the inner shell 41 of the tested nozzle is qualified, and if the pressure value is not within the range, the inner shell 41 of the tested nozzle is unqualified;
step four, measuring the pressure of the outer shell 42 of the nozzle to be measured;
4.1) arranging the outer shell back-blowing device 3 in the tested nozzle 4, connecting the air inlet with the outlet of the sonic throttling orifice plate 10 through a tail end pipeline, communicating the air outlet with the tangential hole 44 of the outer shell of the tested nozzle, and plugging the tangential hole 43 of the inner shell of the tested nozzle;
4.2) opening an air source 7, and adjusting the pressure value through a pressure reducer 8;
4.3) when the pressure value of the first pressure sensor 9 is the set pressure, reading the pressure value of the second pressure sensor 11;
4.4) if the pressure value read in the step 4.3) is within the required range, the tested nozzle outer shell 42 is qualified, and if the pressure value is not within the range, the tested nozzle outer shell 42 is unqualified.
The experimental procedures of the method of the present invention are described in detail below.
For example, a certain nozzle blowing requirement: the orifice diameter at a given flow rate and inlet pressure can be calculated by the following formula;
qV＝113SP1×(273/T1)1/2
in the formula: q. q.sV-flow rate through the product, l/min; s-effective cross-sectional area, mm2；P1-absolute pressure upstream of the orifice, MPa; t is1-absolute temperature upstream of the orifice, K; selecting a sound velocity orifice plate 10 according to a calculation result, wherein a test system principle is shown in figure 2, butting a nozzle back-blowing assembly with a product, closing switches K2 and K4 before testing, opening K1, adjusting a pressure reducer, adjusting the pressure of an inlet of the sound velocity orifice plate 10, opening K3, recording the pressure value of a back-blowing inlet of a shell in the nozzle, and measuring the pressure value twice.
Claims (10)
1. A test system for inspecting nozzle braze acceptability, the nozzle (4) comprising a nozzle inner shell (41) and a nozzle outer shell (42) joined by braze, characterized by: the device comprises an air source (7), a pressure reducer (8), a first pressure sensor (9), a sonic orifice plate (10), a second pressure sensor (11), a nozzle back-blowing assembly and a nozzle mounting assembly;
the air source (7), the pressure reducer (8), the first pressure sensor (9) and the sonic throttling orifice plate (10) are sequentially connected through a pipeline; the second pressure sensor (11) is arranged at an outlet of the sonic throttling orifice plate (10);
the nozzle mounting assembly comprises a fixed cylinder (1) and a positioning sleeve (5), and an exhaust hole (101) for exhausting is formed in the side surface of the fixed cylinder (1); the nozzle inner shell (41) is positioned in the fixed cylinder (1), the top of the nozzle inner shell (41) is arranged at the top end of the fixed cylinder (1) through the positioning sleeve (5), the nozzle outer shell (42) is positioned in the fixed cylinder (1), and the bottom of the nozzle outer shell (42) penetrates through a bottom plate of the fixed cylinder (1);
the nozzle back-blowing assembly comprises an inner shell back-blowing device (2) and an outer shell back-blowing device (3); when the inner shell (41) of the nozzle is tested, the inner shell blowback device (2) is arranged in the nozzle (4), the air inlet is connected with the outlet of the sonic throttling orifice plate (10) through a tail end pipeline, the air outlet is communicated with the tangential hole (43) of the inner shell of the nozzle, and the tangential hole (44) of the outer shell of the nozzle is blocked;
when the nozzle outer shell (42) is tested, the outer shell back blowing device (3) is arranged in the nozzle (4), the air inlet is connected with an outlet of the sonic throttling orifice plate (10) through a tail end pipeline, the air outlet is communicated with a tangential hole (44) of the nozzle outer shell, and the tangential hole (43) of the nozzle inner shell is blocked.
2. The test system for inspecting nozzle braze pass of claim 1, wherein: and a sealing gasket (6) is arranged on the contact surface of the nozzle outer shell (42) and the fixed cylinder (1).
3. The test system for inspecting nozzle braze pass of claim 2, wherein: interior casing blowback device (2) are the bushing structure, the sleeve pipe sets up in nozzle shell body (42), and its top is provided with constant head tank (21), the one end nestification of interior casing of nozzle (41) is in constant head tank (21), and the outer wall of constant head tank (21) is with the shutoff of tangential hole (44) of nozzle shell body.
4. The test system for inspecting nozzle braze acceptability according to claim 1, 2 or 3, wherein: outer casing blowback device (3) are ladder rod structure, first pole section (31), second pole section (32) and third pole section (33) that increase in proper order including the diameter, sealed the setting in casing (41) in the nozzle in first pole section (31), second pole section (32) set up in nozzle shell body (42), and inside is provided with blind hole (34) of ventilating, is provided with on the lateral wall and crosses discharge orifice (35) with blind hole (34) of ventilating and nozzle shell body (42) tangential hole intercommunication, third pole section (33) set up in nozzle shell body (42), and inside is provided with blind hole (34) of ventilating and ventilation through-hole (36) of terminal pipeline intercommunication.
5. The test system for inspecting nozzle braze pass of claim 4, wherein: and a sealing ring (14) is arranged on the contact surface between the first rod section (31) and the nozzle inner shell (41), and a sealing ring (14) is arranged on the contact surface between the third rod section (33) and the nozzle outer shell (42).
6. The test system for inspecting nozzle braze pass of claim 5, wherein: and a filter (12) and a valve (13) are arranged on an outlet pipeline of the air source (7).
7. The test system for inspecting nozzle braze pass of claim 6, wherein: the top end of the first rod section (31) is provided with a round shape.
8. A test method for inspecting nozzle brazing qualification is characterized by comprising the following steps:
step one, selecting a sound velocity throttle orifice;
1.1) calculating the effective sectional area of an orifice on a sound velocity throttling orifice plate according to the set pressure and the set flow;
qV＝113SP1×(273/T1)1/2
wherein: q. q.sV-setting a flow rate;
s-effective cross-sectional area;
P1-a set pressure;
T1-absolute temperature;
1.2) calculating the radius of the throttling hole according to the effective sectional area obtained in the step 1.1);
1.3) selecting a sonic throttling orifice plate according to the throttling radius calculated in the step 1.2);
step two, installing a test system;
the air source, the pressure reducer, the first pressure sensor and the sonic throttling orifice plate are sequentially connected through a pipeline; arranging a second pressure sensor at an outlet of the sonic throttling orifice plate; fixedly mounting the nozzle to be tested through a nozzle mounting component;
measuring the pressure of the inner shell of the tested nozzle;
3.1) arranging a back flushing device of the inner shell in the tested nozzle, connecting the air inlet with an outlet of the sonic throttling orifice plate through a tail end pipeline, communicating the air outlet with a tangential hole of the inner shell of the tested nozzle, and plugging the tangential hole of the outer shell of the tested nozzle;
3.2) opening a gas source, and adjusting a pressure value through a pressure reducer;
3.3) reading the pressure value of the second pressure sensor when the pressure value of the first pressure sensor is the set pressure;
3.4) if the pressure value read in the step 3.3) is within the required range, the inner shell of the tested nozzle is qualified, and if the pressure value is not within the range, the inner shell of the tested nozzle is unqualified;
measuring the pressure of the outer shell of the nozzle to be measured;
4.1) arranging a back flushing device of the outer shell in the tested nozzle, connecting the air inlet with an outlet of the sonic throttling orifice plate through a tail end pipeline, communicating the air outlet with a tangential hole of the outer shell of the tested nozzle, and plugging the tangential hole of the inner shell of the tested nozzle;
4.2) opening a gas source, and adjusting a pressure value through a pressure reducer;
4.3) reading the pressure value of the second pressure sensor when the pressure value of the first pressure sensor is the set pressure;
4.4) if the pressure value read in the step 4.3) is within the required range, the outer shell of the tested nozzle is qualified, and if the pressure value is not within the range, the outer shell of the tested nozzle is unqualified.
9. The test method of inspecting nozzle braze pass of claim 8, wherein: in the second step, the nozzle mounting assembly comprises a fixed cylinder and a positioning sleeve, and an exhaust hole for exhausting is formed in the side surface of the fixed cylinder; the inner casing of the nozzle is located the fixed cylinder, the top of the inner casing of the nozzle is arranged on the top end of the fixed cylinder through the locating sleeve, the outer casing of the nozzle is located the fixed cylinder, the bottom of the outer casing of the nozzle penetrates through the bottom plate of the fixed cylinder, and a sealing gasket is arranged on the contact surface of the outer casing of the nozzle and the fixed cylinder.
10. The test method of inspecting nozzle braze pass of claim 9, wherein: in the second step, the testing system further comprises a filter and a valve which are arranged on the gas source outlet pipeline.
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