A novel test bench for calibrating a centrifugal compressor

Abstract

The present invention relates to the field of testing, and specifically to a new type of test bench for calibrating a centrifugal compressor, which includes an impeller. One end of the impeller is connected to a diffuser pipe, and an adjustable guide vane is installed inside the diffuser pipe. The end of the impeller away from the diffuser pipe is connected to a diffuser, and a volute is connected to the diffuser. The end of the diffuser pipe away from the impeller is connected to an intake flow pipe, and an orifice flowmeter and a flow regulating valve are installed on the intake flow pipe. Pressure and temperature sensors are set at the flow pipe, impeller, and diffuser to detect the parameters at each stage, so as to calibrate each other, thereby effectively grasping the operating power and efficiency of the centrifugal compressor. An early warning monitor is also added to monitor and give early warning of the surge phenomenon occurring during the test, effectively preventing the surge from damaging the test equipment, and being able to detect and alarm in time when the internal air pressure increases due to the blockage of the outlet, effectively improving the safety of the test platform.

Description

Technical Field

[0001] A novel calibratable test bench for a centrifugal compressor according to the present invention, particularly a novel calibratable test bench for a centrifugal compressor applied to the testing field. Background Art

[0002] The working principle of a centrifugal compressor is that through the high-speed rotation of the impeller, the gas is thrown out under the action of centrifugal force, thereby increasing the pressure and kinetic energy of the gas. Subsequently, the kinetic energy of the gas is converted into pressure energy in the diffuser, further increasing the pressure of the gas. During the design and production of a centrifugal compressor, it is necessary to test and verify its working efficiency, and then optimize it according to the test results. However, the current test platform is affected by various factors during the test, and the detected working efficiency is not accurate enough.

[0003] To solve the problem that existing test platforms cannot be well calibrated with each other, a certain test device in the market adopts the design of adjusting the probe and has a certain market share.

[0004] Chinese Patent CN202110559145.5 specification discloses a test device and method for the internal flow field of a compressor / axial turbine. This invention uses three sets of numerical control motors. The self-rotation motor controls the self-rotation of the probe to adjust the direction of the probe hole, which can ensure that the probe hole is directly facing the oncoming flow direction at different positions, reducing the measurement error caused by the oncoming flow skew; the linear motion motor controls the linear translation of the probe along the probe axis to achieve the radial linear motion of the probe in the fan-shaped cross-section; the circular motion motor controls the rotation of the probe around the axis to achieve the circular motion of the probe in the fan-shaped cross-section. The combination of these three motion modes and the motion control system and data acquisition system are used to realize the automatic scanning test of the preset measuring points of the fan-shaped cross-section by the probe.

[0005] Chinese Patent CN201911101479.7 specification discloses a method for measuring the clearance between the rotor and stator parts of a centrifugal compressor. This measurement method determines the reference value of the outlet clearance between the theoretical centrifugal impeller and the theoretical centrifugal impeller shroud through the theoretical coordinate system to fix the relative position of the physical centrifugal impeller and the physical centrifugal impeller shroud along the axial direction, thereby facilitating the determination of the inlet clearance value between the physical centrifugal impeller and the physical centrifugal impeller shroud.

[0006] The existing test platform measurement methods are too single and one-sided, and cannot well integrate the measurement data at each air inlet of the entire device and calibrate them with each other, so that the power and efficiency of each part cannot be accurately grasped, which is not helpful for understanding the overall working efficiency of the compressor. Summary of the Invention

[0007] In view of the above-mentioned prior art, the technical problem to be solved by the present invention is how to perform automatic calibration during the test process to confirm the parameters of the centrifugal compressor at each stage.

[0008] To solve the above problems, the present invention provides a novel test bench for calibrating a centrifugal compressor, which includes an impeller. One end of the impeller is connected to a diffuser pipe, and an adjustable guide vane is installed inside the diffuser pipe. The end of the impeller away from the diffuser pipe is connected to a diffuser, and a volute is connected to the diffuser. The end of the diffuser pipe away from the impeller is connected to an intake flow pipe, and an orifice flowmeter and a flow regulating valve are installed on the intake flow pipe. A filter grille is installed at a position of the intake flow pipe close to the flow regulating valve, and a rectifier is installed at a position of the intake flow pipe close to the filter grille. A-a section and b-b section are respectively arranged at the head and tail positions of the intake flow pipe, and a-a section and b-b section are respectively the measuring point of the flow pipe and the inlet of the guide vane. Three pitot tubes are installed at a-a section in an equally spaced and circumferential manner, and the static pressure output ends of the three pitot tubes are simultaneously connected to a U-shaped water pipe through a tee pipe. A total temperature and total pressure composite probe is installed at b-b section. A c-c section is provided on the impeller, and c-c section is the inlet of the impeller. A total temperature and total pressure composite probe is installed at c-c section. D-d section and e-e section are respectively arranged at the head and tail positions of the diffuser, and d-d section and e-e section are respectively the inlet and outlet of the diffuser. A total pressure probe and a static pressure sensor are installed at d-d section. A total pressure probe and a static pressure sensor are installed at e-e section. An f-f section is provided on the volute, and f-f section is the outlet of the volute. A pressure sensor and a temperature sensor are installed at f-f section, and the measuring holes of the pressure sensor and the temperature sensor are distributed at an included angle of 180°.

[0009] In the above novel test bench for calibrating a centrifugal compressor, the flow pipe, the orifice flowmeter, the flow regulating valve, the inlet differential pressure and the inlet pressure sensor are used for mutual calibration to confirm the accuracy of the inlet parameters. In addition, total pressure and static pressure measuring points are set at the impeller outlet and the diffuser disk outlet to confirm the parameters of the compressor at each stage.

[0010] As a further improvement of the present application, a warning monitor is also connected between the diffuser and the impeller. The warning monitor includes two straight-through pipes, and a pressure-sensing pipe is connected between the two straight-through pipes. An outer shell of the monitor is fixedly connected to the outside of the pressure-sensing pipe. Sliding cavities are formed in the inner walls of the outer shell of the monitor on both sides of the pressure-sensing pipe, and self-breaking pressure-bearing seats are connected to the inner walls of the sliding cavities. A sliding seat is also slidably connected to the inner wall of the sliding cavity, and a spring is fixedly connected between the sliding seat and the self-breaking pressure-bearing seat. A push rod is fixedly connected to the side wall of the sliding seat, and the push rod penetrates through the self-breaking pressure-bearing seat and is fixedly connected to the side wall of the pressure-sensing pipe. Induction cavities are formed in the inner walls on both sides of the sliding cavity, and a light-transmitting plate flush with the inner wall of the sliding cavity is fixedly connected to the opening of the induction cavity. Laser rangefinders vertically irradiating the light-transmitting plate are embedded at both ends of the sliding seat, and ranging seats matched with the laser rangefinders are fixedly connected to the inner walls of the induction cavities. The laser rangefinders are electrically connected to a distance broken-line graph drawing module, a data analysis module, and a warning module. By adding a warning monitor in front of the diffuser to monitor surging, the pressure change of the gas during surging is used to vibrate the pressure-sensing pipe, and the pressure-sensing pipe then drives the sliding seat to reciprocate. During the reciprocating movement of the sliding seat, the laser rangefinder continuously detects the distance between itself and the ranging seat. The laser rangefinder sends the detected data to the distance broken-line graph drawing module, and the distance broken-line graph drawing module plots the data into a broken-line graph for convenient visual viewing and analysis by researchers. The data analysis module analyzes and statistically processes the data detected by the laser rangefinder to analyze the frequency and time of surging. When the frequency and time of surging exceed the set safety threshold, the data analysis module activates the warning module to trigger an alarm. In this way, during the entire test stage, if a surging phenomenon occurs, a warning can be issued in a timely manner to remind the staff to take measures in a timely manner. At the same time, the staff can also analyze and study the monitoring data of each inlet during the occurrence of surging.

[0011] As a further improvement of the present application, the pressure-sensing pipe includes two hard pipe segments, and two hose segments facing the sliding cavity are fixedly connected between the two hard pipe segments. The hard pipe segments are made of metal, and the hose segments are made of elastic material. The high-pressure gas passes through the hose segments before entering the diffuser. Under the pressure, the hose segments are closely attached to the self-breaking pressure-bearing seats. When a surging phenomenon occurs, the deformation of the hose segments is continuously caused by the pressure change and the restoring elastic force of the spring. The hose segments then drive the laser rangefinder on the sliding seat to move back and forth. The distance detection between the laser rangefinder and the ranging seat is used to monitor whether surging occurs during the test process, playing an effective safety monitoring role.

[0012] As a further improvement of the present application, a groove is also provided on the inner wall of the sliding cavity facing the self-breaking pressure-bearing seat. A bracket is fixedly connected to the side wall of the self-breaking pressure-bearing seat, and the lower end of the bracket extends into the groove and is fixedly connected to a magnetic suction seat. A magnetic suction head magnetically attracted to the magnetic suction seat is fixedly connected to the inner wall of the groove. The magnetic suction seat and the magnetic suction head are firmly magnetically attracted together, which can fix the self-breaking pressure-bearing seat. In the normal working state, the pushing force of the air pressure on the self-breaking pressure-bearing seat is less than the magnetic attraction force between the magnetic suction seat and the magnetic suction head. When the exhaust port is blocked and the internal air pressure becomes too high, the pushing force of the air pressure on the self-breaking pressure-bearing seat is greater than the magnetic attraction force between the magnetic suction seat and the magnetic suction head. At this time, the self-breaking pressure-bearing seat retreats under the action of the air pressure, which can effectively prevent the air pressure sensing tube from bursting under the air pressure.

[0013] As another improvement of the present application, the ranging seat includes an inclined section and a straight section. A photosensitive sensor is also installed on the straight section, and an alarm is electrically connected to the photosensitive sensor. The inclined section is used to monitor the occurrence of surging. When the air pressure increases, the sliding seat retreats to the inner wall of the sliding cavity under the action of the air pressure. At this time, the light emitted by the laser rangefinder irradiates the photosensitive sensor. After the photosensitive sensor detects the optical signal, it triggers the alarm to give an alarm, reminding the staff to take corresponding measures in time.

[0014] As another improvement of the present application, a buffer pad is fixedly inlaid on the inner wall of the sliding cavity facing the sliding seat, and the buffer pad is made of a high-elastic material. When the air pressure increases, the sliding seat will retreat to the inner wall of the sliding cavity. At this time, the buffer pad can play a good role in shock absorption and buffering.

[0015] In summary, by setting pressure and temperature sensors at the flow tube, impeller, and diffuser to detect the parameters at each stage, and calibrating them with each other, the operating power and efficiency of the centrifugal compressor can be effectively grasped. An early warning monitor is also added to monitor and give early warning of the surging phenomenon occurring during the test, effectively preventing the surging from damaging the test equipment, and when the air outlet is blocked and the internal air pressure increases, it can be detected in time and an alarm is given, effectively improving the safety of the test platform. Description of the Drawings

[0016] Figure 1 The front view of the test platform of the first embodiment of the present application;

[0017] Figure 2 The three-dimensional view of the early warning monitor of the second embodiment of the present application;

[0018] Figure 3 The three-dimensional view of the straight-through pipe and the air pressure sensing pipe of the second embodiment of the present application;

[0019] Figure 4 The exploded three-dimensional view of the air pressure sensing pipe of the second embodiment of the present application;

[0020] Figure 5 Front elevation sectional view of the warning monitor in the second embodiment of the present application before the start of the test;

[0021] Figure 6 Front elevation sectional view of the warning monitor in the second embodiment of the present application after the start of the test;

[0022] Figure 7 Front elevation sectional view of the warning monitor in the second embodiment of the present application when the air pressure increases;

[0023] Figure 8 is Figure 5 Enlarged view of the structure at position A in

[0024] Figure 9 Distance broken line graph drawn by the laser rangefinder when surge phenomenon occurs in the second embodiment of the present application.

[0025] Description of the reference numerals in the figure:

[0026] 1 impeller, 2 diffuser tube, 3 diffuser, 4 volute, 5 intake flow tube, 6 orifice flowmeter, 7 flow regulating valve, 8 filter grille, 9 rectifier, 10 pitot tube, 11 warning monitor, 12 straight tube, 13 air pressure sensing tube, 1301 hard tube section, 1302 flexible tube section, 14 monitoring housing, 1401 sliding cavity, 1402 induction cavity, 15 self-breaking pressure bearing seat, 16 sliding seat, 17 push rod, 18 light-transmitting plate, 19 laser rangefinder, 20 ranging seat, 21 bracket, 22 magnetic attraction seat, 23 magnetic attraction head, 24 buffer pad. Specific embodiments

[0027] The following will describe in detail the two embodiments of the present application with reference to the accompanying drawings.

[0028] The first embodiment:

[0029] Figure 1 As shown, it includes an impeller 1. One end of the impeller 1 is connected to a diffuser tube 2, and adjustable guide vanes are installed inside the diffuser tube 2. The end of the impeller 1 away from the diffuser tube 2 is connected to a diffuser 3, and a volute 4 is connected to the diffuser 3. The end of the diffuser tube 2 away from the impeller 1 is connected to an intake flow tube 5, and an orifice flowmeter 6 and a flow regulating valve 7 are installed on the intake flow tube 5. A filter grille 8 is installed at a position of the intake flow tube 5 close to the flow regulating valve 7, and a rectifier 9 is installed at a position of the intake flow tube 5 close to the filter grille 8;

[0030] Figure 1It is shown that an a-a cross-section and a b-b cross-section are respectively arranged at the head and tail positions of the intake air flow pipe 5, and the a-a cross-section and the b-b cross-section are respectively the flow pipe measurement point and the guide vane inlet. Three equally spaced and circumferentially arranged pitot tubes 10 are installed at the a-a cross-section, and the static pressure output ends of the three pitot tubes 10 are simultaneously connected to a U-shaped water pipe through a three-way pipe. A total temperature and total pressure composite probe is installed at the b-b cross-section. A c-c cross-section is arranged on the impeller 1, and the c-c cross-section is the impeller inlet. A total temperature and total pressure composite probe is installed at the c-c cross-section. d-d cross-sections and e-e cross-sections are respectively arranged at the head and tail positions of the diffuser 3, and the d-d cross-section and the e-e cross-section are respectively the diffuser inlet and the diffuser outlet. A total pressure probe and a static pressure sensor are installed at the d-d cross-section, and a total pressure probe and a static pressure sensor are installed at the e-e cross-section (the pressure measurement points at the diffuser inlet and the diffuser outlet are both circumferentially distributed at 45° to the axial horizontal line of the diffuser 3). An f-f cross-section is arranged on the volute 4, and the f-f cross-section is the volute outlet. A pressure sensor and a temperature sensor are installed at the f-f cross-section, and the measurement holes of the pressure sensor and the temperature sensor are distributed at an included angle of 180°.

[0031] The second implementation mode:

[0032] Figure 2 、 3 and Figure 4 It is shown that a warning monitor 11 is also connected between the diffuser 3 and the impeller 1. The warning monitor 11 includes two straight-through pipes 12, and a pneumatic sensing pipe 13 is connected between the two straight-through pipes 12. The pneumatic sensing pipe 13 includes two hard pipe segments 1301, and two hose segments 1302 facing the sliding cavities 1401 are fixedly connected between the two hard pipe segments 1301. The hard pipe segments 1301 are made of metal, and the hose segments 1302 are made of elastic material (preferably polyurethane elastic material, and other materials can also be selected according to actual needs). The high-pressure gas passes through the hose segment 1302 before entering the diffuser 3. Under the air pressure, the hose segment 1302 is tightly attached to the self-breaking pressure-bearing seat 15. When a surge phenomenon occurs, the change in air pressure and the restoring elastic force of the spring cause the hose segment 1302 to continuously deform. The hose segment 1302 then drives the laser rangefinder 19 on the sliding seat 16 to move back and forth. The distance between the laser rangefinder 19 and the ranging seat 20 is used to detect whether a surge occurs during the test, playing an effective safety monitoring role;

[0033] Figure 5 、 6As shown in FIGS. 6 and 7, a monitoring housing 14 is fixedly connected to the outside of the air pressure sensing tube 13. Slide chambers 1401 are formed in the inner walls of the monitoring housing 14 on both sides of the air pressure sensing tube 13. A self-breaking pressure-bearing seat 15 is connected to the inner wall of the slide chamber 1401. A slide seat 16 is also slidably connected to the inner wall of the slide chamber 1401. A spring is fixedly connected between the slide seat 16 and the self-breaking pressure-bearing seat 15. A push rod 17 is fixedly connected to the side wall of the slide seat 16. The push rod 17 penetrates through the self-breaking pressure-bearing seat 15 and is fixedly connected to the side wall of the air pressure sensing tube 13. Induction chambers 1402 are formed in the inner walls on both sides of the slide chamber 1401. A light-transmitting plate 18 flush with the inner wall of the slide chamber 1401 is fixedly connected to the opening of the induction chamber 1402. Laser rangefinders 19 (specific models are selected according to actual requirements and will not be described in detail here) that vertically irradiate the light-transmitting plate 18 are embedded at both ends of the slide seat 16. A ranging seat 20 matching the laser rangefinder 19 is fixedly connected to the inner wall of the induction chamber 1402. The ranging seat 20 includes an inclined section and a straight section. A photosensitive sensor (specific models are selected according to actual requirements and will not be described in detail here) is installed on the straight section. An alarm is electrically connected to the photosensitive sensor. The inclined section is used to monitor the occurrence of surge. When the air pressure increases, the slide seat 16 retreats to the inner wall of the slide chamber 1401 under the action of the air pressure. At this time, the light emitted by the laser rangefinder 19 irradiates the photosensitive sensor. After the photosensitive sensor detects the optical signal, it triggers the alarm to give an alarm, reminding the staff to take corresponding measures in time;

[0034] Figure 9 As shown, the laser rangefinder 19 is electrically connected to a distance line graph drawing module, a data analysis module, and an early warning module. An early warning monitor 11 is added in front of the diffuser 3 to monitor surge. The air pressure change of the gas during surge causes the air pressure sensing tube 13 to vibrate. The air pressure sensing tube 13 then drives the slide seat 16 to reciprocate. During the reciprocating movement of the slide seat 16, the laser rangefinder 19 continuously detects the distance between it and the ranging seat 20. The laser rangefinder 19 sends the detected data to the distance line graph drawing module. The distance line graph drawing module plots the data as a line graph for the convenience of intuitive viewing and analysis by researchers. The data analysis module analyzes and statistically processes the data detected by the laser rangefinder 19 to analyze the frequency and time of surge. When the frequency and time of surge exceed the set safety threshold, the data analysis module activates the early warning module to trigger an alarm. In this way, during the entire test stage, if a surge phenomenon occurs, an early warning can be issued in time, thus reminding the staff to take measures in time. At the same time, the staff can also analyze and study the monitoring data of each inlet during the occurrence of surge;

[0035] Figure 8It is shown that a groove is also formed in the inner wall of the self-breaking pressure-bearing seat 15 facing the sliding cavity 1401. A bracket 21 is fixedly connected to the side wall of the self-breaking pressure-bearing seat 15, and the lower end of the bracket 21 extends into the groove and is fixedly connected with a magnetic attraction seat 22. A magnetic attraction head 23 magnetically attracted to the magnetic attraction seat 22 is fixedly connected to the inner wall of the groove. The magnetic attraction seat 22 and the magnetic attraction head 23 are firmly magnetically attracted together, which can play a role in fixing the self-breaking pressure-bearing seat 15. Under normal working conditions, the pushing force of the air pressure on the self-breaking pressure-bearing seat 15 is less than the magnetic attraction force between the magnetic attraction seat 22 and the magnetic attraction head 23. When the exhaust port is blocked and the internal air pressure becomes too high, the pushing force of the air pressure on the self-breaking pressure-bearing seat 15 is greater than the magnetic attraction force between the magnetic attraction seat 22 and the magnetic attraction head 23. At this time, the self-breaking pressure-bearing seat 15 retreats under the action of the air pressure, which can effectively prevent the air pressure sensing tube 13 from bursting under the air pressure. A buffer pad 24 is fixedly inlaid on the inner wall of the sliding cavity 1401 facing the sliding seat 16, and the buffer pad 24 is made of a high-elastic material (preferably rubber material, and other materials can also be selected according to actual needs). When the air pressure increases, the sliding seat 16 will retreat to the inner wall of the sliding cavity 1401. At this time, the buffer pad 24 can play a good role in shock absorption and buffering.

[0036] The working principle of this test bench is as follows: After the test starts, the pitot tube 10, orifice flowmeter 6, flow regulating valve 7, and the composite probe, total pressure probe, total temperature probe and sensor installed at each section monitor the inlet flow at each stage, and calibrate each other according to the monitored data, so as to accurately obtain the parameters at each stage and understand the power and efficiency of the entire centrifugal compressor. During the test, the gas passes through the early warning monitor 11 before compression. Under normal ventilation conditions, the hose section 1302 switches from the initial concave state to the working state pressed on the self-breaking pressure-bearing seat 15 by the air pressure. At this time, the entire air pressure sensing tube 13 plays a role in ventilation. When the outlet is blocked and surge occurs, the change in air pressure causes the hose section 1302 to deform and switch back and forth between the initial state and the working state. The repeated deformation of the hose section 1302 causes the push rod 17 to drive the sliding seat 16 to move back and forth. The laser rangefinder 19 installed on the sliding seat 16 emits laser to the ranging seat 20 for ranging. Since the distance from the inclined section of the ranging seat 20 to the laser rangefinder 19 is changing, the data measured by the laser rangefinder 19 changes in a zigzag shape. During this process, the distance line graph drawing module draws the data into a line graph for the convenience of researchers to view and analyze intuitively. The data analysis module analyzes and statistics the data detected by the laser rangefinder 19 to analyze the frequency and time of surge. When the frequency and time of surge exceed the set safety threshold, the data analysis module starts the early warning module to trigger an alarm. In this way, during the entire test stage, if surge occurs, an early warning can be issued in time to remind the staff to take measures in time. At the same time, the staff can also analyze and study the monitoring data of each inlet when surge occurs;

[0037] When a blockage occurs at the air outlet, causing the internal air pressure to increase, the increased air pressure further presses the hose section 1302 against the self-breaking pressure-bearing seat 15. When the air pressure exceeds the magnetic attraction force between the magnetic head 23 and the magnetic seat 22, the self-breaking pressure-bearing seat 15 starts to move backward. At this time, the sliding seat 16 also starts to move backward until the sliding seat 16 touches the buffer pad 24. At this moment, the laser emitted by the laser rangefinder 19 just shines on the photosensitive sensor. After the photosensitive sensor detects the optical signal, it triggers the alarm to give an alarm, reminding the staff to take corresponding measures in time, thereby effectively protecting the safety of the test equipment.

[0038] Combined with the current actual requirements, the above-mentioned implementation manner adopted in this application, the protection scope is not limited thereto. Within the knowledge scope of those skilled in the art, various changes made without departing from the concept of this application still fall within the protection scope of the present invention.

Claims

1. A novel test bench for calibrating a centrifugal compressor, characterized in that: It includes an impeller (1), one end of the impeller (1) is connected to a diffuser tube (2), and adjustable guide vanes are installed inside the diffuser tube (2). The end of the impeller (1) far from the diffuser tube (2) is connected to a diffuser (3), and a volute (4) is connected to the diffuser (3). The end of the diffuser tube (2) far from the impeller (1) is connected to an intake flow pipe (5), and an orifice flowmeter (6) and a flow regulating valve (7) are installed on the intake flow pipe (5). A filter grille (8) is installed at a position of the intake flow pipe (5) close to the flow regulating valve (7), and a rectifier (9) is installed at a position of the intake flow pipe (5) close to the filter grille (8). The head and tail positions of the intake flow pipe (5) are respectively provided with an a-a section and a b-b section, and the a-a section and the b-b section are respectively the flow pipe measurement point and the guide vane inlet. Three equally spaced and circumferentially distributed pitot tubes (10) are installed at the a-a section, and the static pressure output ends of the three pitot tubes (10) are simultaneously connected to a U-shaped water pipe through a tee. A total temperature and total pressure combined probe is installed at the b-b section. An c-c section is provided on the impeller (1), and the c-c section is the impeller inlet. A total temperature and total pressure combined probe is installed at the c-c section. The head and tail positions of the diffuser (3) are respectively provided with a d-d section and an e-e section, and the d-d section and the e-e section are respectively the diffuser inlet and the diffuser outlet. A total pressure probe and a static pressure sensor are installed at the d-d section. A total pressure probe and a static pressure sensor are installed at the e-e section. An f-f section is provided on the volute (4), and the f-f section is the volute outlet. A pressure sensor and a temperature sensor are installed at the f-f section, and the measurement holes of the pressure sensor and the temperature sensor are distributed at an angle of 180°; A warning monitor (11) is also connected between the diffuser (3) and the impeller (1). The warning monitor (11) includes two straight pipes (12), and a pneumatic sensing pipe (13) is connected between the two straight pipes (12). A monitoring housing (14) is fixedly connected to the outside of the pneumatic sensing pipe (13). Slide chambers (1401) are opened on the inner walls of the monitoring housing (14) on both sides of the pneumatic sensing pipe (13), and self-breaking pressure-bearing seats (15) are connected to the inner walls of the slide chambers (1401). A slide seat (16) is also slidably connected to the inner wall of the slide chamber (1401), and a spring is fixedly connected between the slide seat (16) and the self-breaking pressure-bearing seat (15). A push rod (17) is fixedly connected to the side wall of the slide seat (16), and the push rod (17) penetrates through the self-breaking pressure-bearing seat (15) and is fixedly connected to the side wall of the pneumatic sensing pipe (13). Induction chambers (1402) are opened on the inner walls of both sides of the slide chamber (1401), and a light-transmitting plate (18) flush with the inner wall of the slide chamber (1401) is fixedly connected to the opening of the induction chamber (1402). Laser rangefinders (19) vertically irradiating the light-transmitting plate (18) are embedded at both ends of the slide seat (16), and a ranging seat (20) matching the laser rangefinders (19) is fixedly connected to the inner wall of the induction chamber (1402). A distance broken line graph drawing module, a data analysis module, and a warning module are electrically connected to the laser rangefinders (19).

2. The novel test bench for calibrating a centrifugal compressor according to claim 1, characterized in that: The pneumatic sensing pipe (13) includes two hard pipe sections (1301), and two hose sections (1302) facing the slide chambers (1401) are fixedly connected between the two hard pipe sections (1301). The hard pipe sections (1301) are made of metal material, and the hose sections (1302) are made of elastic material.

3. A novel test bench for calibrating a centrifugal compressor according to claim 1, characterized in that: A groove is also opened on the inner wall of the slide chamber (1401) facing the self-breaking pressure-bearing seat (15). A support (21) is fixedly connected to the side wall of the self-breaking pressure-bearing seat (15), and the lower end of the support (21) extends into the groove and is fixedly connected to a magnetic suction seat (22). A magnetic suction head (23) magnetically attracted to the magnetic suction seat (22) is fixedly connected to the inner wall of the groove.

4. A novel test bench for calibrating a centrifugal compressor according to claim 1, characterized in that: The ranging seat (20) includes an inclined section and a straight section. A photosensitive sensor is also installed on the straight section, and an alarm is electrically connected to the photosensitive sensor.

5. A novel test bench for calibrating a centrifugal compressor according to claim 1, characterized in that: A buffer pad (24) made of high-elastic material is fixedly embedded on the inner wall of the slide chamber (1401) facing the slide seat (16).

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