CN116163979A - Exhaust system for special air inlet coupling air compressor test platform - Google Patents

Abstract

The invention discloses an exhaust system for a special air inlet coupling compressor test platform, which is connected with a test piece outlet to realize exhaust collection and back pressure adjustment; the exhaust system comprises an exhaust collection throttling device, an anti-asthma device and an exhaust pipeline, and the exhaust pipeline is communicated with the atmosphere; the exhaust collecting throttling device comprises an exhaust collector, a throttling device and an exhaust switching section, wherein the exhaust collector comprises a bearing casing and a gas collecting volute for wrapping the bearing casing, and two ends of the exhaust switching section are respectively connected with the gas collecting volute and an exhaust pipeline; the throttling device is arranged at the inner cavity of the bearing casing and comprises a fixed ring, a movable ring, a mounting ring and an axial movement straight-stroke synchronous motor, and the movable ring moves on the fixed ring along the axial direction; the de-asthmatic device comprises a pipeline which is communicated with the fixed ring and the gas collecting volute, and a pneumatic quick-opening valve is arranged on the pipeline. The exhaust system can realize the adjustable back pressure and back cavity of the compressor, slow surge relief and quick surge relief, and ensure accurate capture of the unstable boundary of the compressor and measurement of the unstable characteristic flow field.

Description

Exhaust system for special air inlet coupling air compressor test platform

Technical Field

The invention relates to the technical field of performance test of compressors, in particular to an exhaust system for a special air inlet coupling compressor test platform.

Background

In the process of approaching the compressor from the stable working condition to the unstable working condition, the flow field is gradually deteriorated, which is one of important factors affecting the development and test safety of the engine. In order to ensure safe and stable operation of the compressor in the test run process, a quick and reliable online detection system for the instability of the compressor must be established.

Based on the fact that the pressure is easy to measure compared with other parameters and is sensitive to the reaction of the pneumatic instability phenomenon, the traditional instability detection is generally characterized in that a total pressure or wall static pressure sensor is arranged at an outlet of the compressor, a pressure signal acquired by the sensor is used as an input signal, and whether the compressor enters a surge or stall state is judged through extraction of dynamic pressure characteristics. Because the design principle of the traditional instability detection system is to analyze single outlet pulsation pressure, the first stage of instability cannot be precisely positioned, and effective acquisition and test safety of an instability boundary are seriously affected.

One key factor affecting accurate acquisition of a compressor instability boundary is an exhaust system of a compressor air inlet distortion test bed, technicians have further studied the compressor instability problem by exploring related improvement of the exhaust system at present, for example, patent publication No. CN203616138U discloses an exhaust throttling device for an axial flow compressor performance test, which is based on structural improvement of an exhaust throttling device of an original compressor tester, the device is an exhaust throttle formed by a movable disc 2 and a static disc 1, the static disc 1 and the movable disc 2 are provided with 8 blocks uniformly distributed circumferentially, an air circulation space is reserved between each block, and the exhaust throttle is installed inside an exhaust casing of the compressor test equipment and is close to the rear end of a test piece. In the design, the air circulation space of the static disc 1 is slightly smaller than the area corresponding to the blocking piece of the movable disc 2, and in the test process, the movable disc 2 is controlled to adjust the exhaust area so as to achieve the aim of adjusting the exhaust flow of the test piece. After the improvement is finished, the influence of the exhaust cavity effect on the admission of the performance parameters of the air compressor is greatly reduced, and the test working efficiency is improved. In the technical scheme of the patent, although the accuracy of the performance parameters of the compressor is improved to a certain extent, accurate capture of the instability boundary of the compressor and measurement of the instability characteristic flow field cannot be realized in an assisted mode.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide an exhaust system for a special air inlet coupling air compressor test platform.

The aim of the invention is achieved by the following technical scheme:

an exhaust system for a special air inlet coupling air compressor test platform is characterized in that the exhaust system is connected with an outlet of a test piece to realize exhaust collection and back pressure adjustment;

the exhaust system comprises an exhaust collection throttling device, an anti-asthma device and an exhaust pipeline, and the exhaust pipeline is communicated with the atmosphere; the exhaust collecting throttling device comprises an exhaust collector, a throttling device and an exhaust switching section, wherein the exhaust collector comprises a bearing casing and a gas collecting volute for wrapping the bearing casing, and two ends of the exhaust switching section are respectively connected with the gas collecting volute and an exhaust pipeline; the throttling device is arranged at the inner cavity of the bearing casing and comprises a fixed ring, a movable ring, a mounting ring and an axial movement straight-stroke synchronous motor, and the movable ring can axially move on the fixed ring; the de-asthmatic device comprises a pipeline which is communicated with the fixed ring and the air collecting volute, and a pneumatic quick-opening valve is arranged on the pipeline.

Further, the exhaust collector is designed with an equal flow rate.

Further, two mounting seats are respectively arranged on two sides of the bearing casing, and the central line of the two mounting seats on each side is positioned on the horizontal bisecting plane of the exhaust collector.

Further, the mounting base is provided with reinforcing ribs to increase rigidity.

Further, a linear slide rail is arranged between the movable ring and the fixed ring.

Further, the rapid asthma-relieving time of the asthma-relieving device is not more than 1 second.

Further, the exhaust system also comprises a rainwater collecting device, wherein the rainwater collecting device comprises a gas-water separator, an exhaust stop valve and a water return tank, and the gas-water separator and the water return tank are communicated through a pipeline.

Further, the gas-water separator adopts a baffle type gas-water separator.

Still further, the rainwater collection device includes two rainwater collection branches, respectively: an exhaust duct rain water collection branch communicating with the exhaust duct and an exhaust collector rain water collection branch communicating with the exhaust collector.

Further, the maximum exhaust flow rate of the exhaust system was 25kg/s, the maximum exhaust pressure was 0.6MPa, and the minimum exhaust pressure was 0.13MPa.

Compared with the prior art, the invention has the following beneficial effects:

the exhaust system can realize the functions of adjustable back pressure and back cavity of the compressor, slow surge relief and fast surge relief of the compressor, and ensure accurate capture of the instability boundary of the compressor and measurement of the instability characteristic flow field.

Drawings

FIG. 1 is a schematic structural diagram of a special air intake coupling compressor test bed according to embodiment 1 of the present invention;

fig. 2 is a front view of the structure of the special air intake coupling compressor test stand according to embodiment 1 of the present invention;

FIG. 3 is a top view of the special air intake coupling compressor test stand according to embodiment 1 of the present invention;

FIG. 4 is a diagram showing the overall installation effect of the special air intake coupling compressor test stand according to embodiment 1 of the present invention;

FIG. 5 is a schematic view of an axial air inlet interface according to embodiment 1 of the present invention;

FIG. 6 is a schematic diagram of a boundary layer suction inlet interface according to embodiment 1 of the present invention;

FIG. 7 is a cross-sectional view taken along line A-A of FIG. 6;

fig. 8 is a schematic view of a rainwater-swallowing inlet interface according to embodiment 1 of the present invention;

FIG. 9 is a three-dimensional view of the rain water intake device of FIG. 8;

FIG. 10 is a schematic diagram of a temperature distortion air inlet interface according to embodiment 1 of the present invention;

FIG. 11 is a schematic view of the air inlet interface of the S-bend pipe according to embodiment 1 of the present invention;

FIG. 12 is a schematic diagram of an exhaust system according to embodiment 1 of the present invention;

FIG. 13 is a schematic view showing the structure of an exhaust gas collecting and throttling device according to embodiment 1 of the present invention;

FIG. 14 is a schematic view showing the structure of an exhaust collector according to embodiment 1 of the present invention;

FIG. 15 is a schematic view showing the structure of a throttle device according to embodiment 1 of the present invention;

fig. 16 is a schematic structural view of an asthma relieving device according to embodiment 1 of the present invention.

Detailed Description

In order to clearly illustrate the technical characteristics of the present solution, the following detailed description will explain the present solution by means of specific embodiments and with reference to the accompanying drawings.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application, however, the present application may be practiced otherwise than as described herein, and thus the scope of the present application is not limited by the specific embodiments disclosed below.

In addition, in the description of the present application, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," "circumferential," etc. indicate or refer to an azimuth or a positional relationship based on that shown in the drawings, and are merely for convenience of description and to simplify the description, and do not indicate or imply that the apparatus or element in question must have a specific azimuth, be configured and operated in a specific azimuth, and therefore should not be construed as limiting the present application. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In this application, unless specifically stated and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; the device can be mechanically connected, electrically connected and communicated; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.

In this application, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Example 1

The special air inlet coupling compressor test platform shown in figures 1-4 comprises a variable frequency power system, a speed increasing transmission system 1, a special air inlet simulation system 2, an exhaust system 3, a lubricating oil system and a steady-state test system.

The variable frequency power system is connected with the speed-increasing transmission system, comprises an alternating current variable frequency motor and realizes the stepless speed regulation of constant torque and constant power of the alternating current variable frequency motor, and provides stable power for the test piece;

the speed increasing transmission system 1 comprises a speed increasing box, and drives the test piece to rotate through an output shaft of the speed increasing box, and meanwhile, high-precision measurement of transmission torque and rotation speed is realized;

the special air inlet simulation system 2 is communicated with an air inlet of the test piece, so that axial air inlet of the test piece is realized to simulate total pressure, rotational flow and rain and fog extreme air inlet conditions;

the exhaust system 3 is an adjustable exhaust system with back pressure and back cavity, and is connected with the outlet of the test piece to realize exhaust collection and adjust the back pressure of the exhaust and the cavity;

the steady-state test system is used for measuring pressure, temperature and flow parameters of the test piece and the test platform; processing parameters; data communication; channel configuration; data display and recording.

The variable frequency power system adopts an alternating current variable frequency motor to realize the accurate control requirement on the rotating speed of the air compressor, and mainly comprises a medium voltage switch cabinet, a frequency converter, a variable frequency motor (an asynchronous squirrel cage motor), a rotary encoder, a control cabinet and an automatic and monitoring system, wherein the variable frequency power system belongs to conventional settings.

The speed-increasing transmission system is mainly used for rotating speed improvement, power transmission and torque measurement, the torque measuring device is arranged externally and integrated at the output end of the speed-increasing box, and enough space is reserved for test piece installation, so that test installation and inspection are facilitated. The speed increasing transmission system comprises a low-speed coupler connecting the speed increasing box with the variable frequency power system, a torque measuring device for measuring the torque of a test piece, a high-speed coupler connected with the test piece, a mounting platform and a bracket, wherein the speed increasing box adopts a two-stage herringbone gear parallel shaft double-split transmission structure gearbox, and the input shaft and the output shaft are coaxially arranged. The low-speed shaft and the intermediate shaft of the speed increasing box are supported by rolling bearings, and the high-speed shaft is supported by five-watt tilting pad sliding bearings; the gear and the bearing are both lubricated by forced oil injection, the oil way is an internal oil way, and reasonable oil mass distribution is carried out on meshing in and out points of the gear in order to meet the requirement of bidirectional rotation of the speed increasing box; the speed increasing box is provided with an oil inlet and return hole, oil is fed from the side edge and returns from the bottom.

The special air intake simulation system is shown in fig. 2 and 3, and comprises an axial air intake system 21 and two parallel light rails paved on the ground below the axial air intake system, wherein the axial air intake system comprises a flow tube 211, a diffusion section 212, an air intake regulating valve 213, a large-angle diffusion section 214 and a stabilizing section 215 which are sequentially connected, the flow tube 211 is used for measuring the air intake flow of a test piece, the flow tube comprises a horn mouth and a straight tube section, the diffusion section 212 comprises a front diffusion section between the flow tube and the air intake regulating valve and a rear diffusion section between the air intake regulating valve and the stabilizing section, the rear diffusion section is provided with a first orifice plate for rectification, and the stabilizing section 215 is internally provided with a second orifice plate, a honeycomb device and a rectifying net sequentially along the air flow direction. All parts of the axial air inlet system are connected by flange bolts, and the flanges are sealed by installing rubber asbestos gaskets and O-shaped sealing rings. A plurality of support frames with rollers are also arranged below the axial air inlet system in a scattered manner, wherein two support frames are arranged in a scattered manner at a stable section, a support frame is arranged at a front diffusion section, a support frame 22 is arranged at an air inlet regulating valve, the support frame is formed by welding Q235 sections and plates in an aging manner and integrally processing, and the rollers on the support frame can realize the front-back movement of the axial air inlet system along a light rail, so that test pieces are convenient to assemble and disassemble.

To ensure the flow measurement accuracy, the flow tubes in this embodiment are divided into three groups (see table below), and the range of the airflow velocity coefficient λ in each group of flow tubes is 0.2-0.6, and the corresponding flow tube inner diameter D can be specifically selected according to the flow range of the test compressor.

Flow tube diameter and measurement range comparison table

Sequence number	Flow measurement range (kg/s)	Diameter of throat (mm)
			1	10～25	374
2	4.8～12	276
			3	(2.5～5)kg/s	177

An air inlet filter is arranged at the inlet of the flow tube and is mainly used for filtering dust in the atmosphere, so that the air entering the air compressor test piece is ensured to be clean and clean, and a metal filter product is adopted as the filter.

In the diffusion section, the expansion full angle of the front diffusion section takes 5-10 degrees so as to ensure that the air flow is not easy to separate, and has smaller loss, more uniform flow field and small air flow pulsation, and ensure the flow measurement precision; meanwhile, in order to shorten the length of the rear diffusion section, the rear diffusion section adopts a large-angle structure, namely the expansion full angle of the rear diffusion section is 40-50 degrees. The thickness of the first pore plate in the back diffusion section is 12-18 mm, the first pore plate is uniformly perforated, the diameter of the pore is phi 8-phi 12, and the aperture ratio is 45-50%.

The stabilizing section has the function of rectifying the air inlet, the thickness of a second pore plate of the stabilizing section is 12-18 mm, the second pore plate is uniformly provided with pores, the diameter of the pores is phi 8-phi 12, and the aperture ratio is 45-50%; the honeycomb tube of the honeycomb device is regular hexagon, the diameter of the inscribed circle is 15-25 mm, the length is 350-450 mm, and the wall thickness is 0.1-0.15 mm; the stabilizing section has two rectifying nets, the rectifying net has 20-30 rectifying meshes, the mesh size is 1-2 mm, the wire diameter is 0.2-0.5 mm, the aperture ratio is 60-65%, and the industrial metal wire is adopted to weave square hole screen (GB/T5330-1985); the first rectifying net is 350-450 mm away from the honeycomb device, and the second rectifying net is 350-450 mm away from the first rectifying net.

Four wall static pressure measuring points are arranged at the inlet of the second pore plate of the stabilizing section and the inlet of the honeycomb device, and four total temperature measuring points, four five-point total pressure measuring points and four static pressure measuring points are arranged behind the rectifying net so as to measure airflow parameters.

In order to better simulate the total inlet pressure, rotational flow and rain and fog extreme air inlet conditions of the air compressor, the air compressor test platform comprises the following five special air inlet interface structures:

a: the axial air inlet interface structure as shown in fig. 5: the stabilizing section 215 of the axial air inlet system is connected with the air inlet of the test piece through a flexible connecting piece 41, the flexible connecting piece can be an expansion joint, and a connecting plate 42 is arranged at the joint of the stabilizing section 215 and the flexible connecting piece 41 for sealing; when an influence test of axial air intake on the performance of the compressor is carried out, the axial air intake volute is arranged in the stable section, and the axial air intake inflow condition is simulated.

B: boundary layer suction inlet interface structure as shown in fig. 6 and 7: the device comprises a boundary layer suction air inlet device 43 which is partially arranged in the stable section, and the end part of the boundary layer suction air inlet device positioned outside the stable section is connected with an air inlet of the test piece; the boundary layer suction air inlet device 43 is a sphere structure with a larger through hole at the center, and a mounting plate 431 with a length which spans the diameter of the stabilizing section is arranged at the end surface of the through hole in the stabilizing section 215 so that the boundary layer suction air inlet device is stably mounted in the stabilizing section; when the influence test of the boundary layer suction air inlet on the performance of the compressor is carried out, the boundary layer suction air inlet device is arranged in the stable section of the air inlet system through the mounting plate, and the condition of the incoming flow of the boundary layer suction air inlet is simulated.

C: the rainwater-swallowing air inlet interface structure shown in fig. 8 and 9: the device comprises a water-retaining frame 44 arranged at an air inlet of a test piece, a contraction section 216 is arranged between the water-retaining frame 44 and a stabilizing section 215, and the contraction section belongs to a part of an axial air inlet system; as shown in fig. 9, the water-retaining frame 44 includes an outer ring annular structure 441 and an inner ring annular structure 442, a plurality of pipes 443 are arranged between the outer ring annular structure and the inner ring annular structure at intervals, a water inlet 444 is connected to the outer ring annular structure, a plurality of water outlet nozzles 445 are uniformly distributed on the inner ring annular structure, and the direction of the water outlet nozzles 445 is set along the air flow direction of the axial air inlet system 21; when the influence test of rainwater-swallowing air intake on the performance of the air compressor is carried out, the water-swallowing frame is arranged at the inlet of the air compressor, and the rainwater-sucking working condition of the air compressor is simulated.

D: temperature distortion air inlet interface structure as shown in fig. 10: in order to arrange the electric heater 45 in the stabilizing section 215, a contraction section 216 and a flexible connecting piece 41 are also arranged between the stabilizing section 215 and the air inlet of the test piece, wherein the contraction section is a part of an axial air inlet system, and the flexible connecting piece is preferably an expansion joint; when the influence test of temperature distortion air intake on the performance of the air compressor is carried out, the electric heater is additionally arranged in the stable section, so that the air intake temperature distortion of the air compressor can be realized.

E: the S-shaped elbow air inlet interface structure shown in FIG. 11: the test piece comprises an S-shaped bent pipe air inlet 46 connected with a stabilizing section 215, the other end of the S-shaped bent pipe air inlet is communicated with an air inlet of a test piece, and a connecting plate 42 is arranged at the joint of the stabilizing section 215 and the S-shaped bent pipe air inlet 46 for sealing. When the influence test of the S-shaped bent pipe air inlet on the performance of the air compressor is carried out, the S-shaped bent pipe air inlet channel is arranged at the inlet of the air compressor, and the air inlet condition of the S-shaped bent pipe of the air compressor is simulated.

The contraction section has the functions of accelerating the contraction of the air flow from the stabilization section and ensuring the quality of a flow field (the velocity and the flow degree of the inlet of the test piece are not more than 3 percent, and the total pressure non-uniformity of the inlet of the test piece is not more than 5 percent). The inlet of the contraction section is a stable section outlet, and the contraction section adopts a hyperbolic curve shape.

The main technical indexes of the special air inlet simulation system are as follows: maximum intake air flow rate: 25kg/s; intake air temperature: normal temperature; intake air filtration accuracy: 20 μm; flow measurement accuracy: better than + -1% FS; flow measurement range: 0 to 25kg/s (standard condition).

The back pressure and back cavity adjustable exhaust system (namely the exhaust system) is used for exhaust collection and back pressure adjustment of the research on the coupling characteristics of the compressor component and the axial air inlet system, and has the main functions of realizing the adjustable back pressure and back cavity of an outlet of a compressor experimental part, and the functions of slow surge relief and rapid surge relief of the compressor, so as to ensure accurate capture of the instability boundary of the compressor and measurement of an instability characteristic flow field.

Specifically, as shown in fig. 12 and 13, the back pressure and back chamber adjustable exhaust system includes an exhaust gas collection throttle device 31, a de-asthmatic device 32, an exhaust pipe 33, and a rainwater collection device (not shown), the exhaust pipe 33 being open to the atmosphere; in fig. 13, the exhaust collecting and throttling device comprises an exhaust collector 311, a throttling device 312, an exhaust switching section 313 and a support 314, as shown in fig. 14, the exhaust collector comprises a bearing casing 3111 and a gas collecting volute 3112 wrapping the bearing casing, the bearing casing is formed by welding forgings, the gas collecting volute is formed by welding plates, the two are in equal flow rate design and are connected through bolts, the gas collecting volute is unpressurized, and the flow passage section of the gas collecting volute 3112 is square, so that the processing is convenient. The bearing casing is a main bearing casing of the test piece and the exhaust throttling device, bears aerodynamic force, is formed by welding forgings for ensuring enough rigidity, adopts an equal flow rate design for the exhaust collector 311, and two ends of the exhaust switching section 313 are respectively connected with the gas collecting volute and the exhaust pipeline.

Two mounting seats 3113 are respectively arranged on two sides of the bearing casing 3111, reinforcing ribs are arranged on the mounting seats to increase rigidity, and the connecting line of the central lines of the two mounting seats on each side is positioned on the horizontal bisecting plane of the exhaust collector. The mounting seat is provided with a transverse key so as to ensure that the axial height of the rotor of the test piece is unchanged and no transverse deflection occurs during hot running. Referring to fig. 13, the exhaust collector is connected and supported with four mounting seats 3113 on the bearing casing through four supports 314, the materials of the supports adopt HT200, each support is connected with a basic mounting platform of the test stand through T-shaped bolts, the upper surface adjusts the position of the bearing casing through adjusting the oblique iron, and the concentric requirement of the axes of the test piece and the speed-increasing transmission system is ensured.

In order to reduce the exhaust loss, reduce the exhaust turbulence level, improve the pressure ratio test range and the test precision, the exhaust system is not provided with an exhaust gate valve for throttling, and a small-cavity throttling device shown in fig. 15 is adopted for regulating the exhaust back pressure; the throttling device 312 is arranged in the inner cavity of the bearing casing 3111, the throttling device 312 comprises a fixed ring 3121, a movable ring 3122, a mounting ring 3123 and an axial movement straight travel synchronous motor 3124, the motor is provided with a push rod which is connected with the movable ring 3122, and the push rod pushes the movable ring 3122 to move on the fixed ring 3121 along the axial direction; during operation, the movable ring moves on the fixed ring along the axial direction to cover the window of the fixed ring, and the exhaust back pressure is changed by changing the exhaust area.

The exhaust system of the present invention adopts a quick-opening valve for relieving asthma, and as shown in fig. 16, the asthma relieving device 32 comprises a pipeline 321 which is communicated with a fixed ring 3121 and a gas collecting volute 3112, and a pneumatic quick-opening valve 322 is arranged on the pipeline. In the test, the compressed air at the test piece outlet is collected into the air collection scroll 3112 through a hose. When the compressor surges, the pneumatic quick-opening valve 322 at the downstream of the gas collecting volute is quickly opened, part of air flow is quickly released, the surge is exited, and the surge relief device 32 can realize quick surge relief, so that the test safety is ensured. The pneumatic quick-opening valve 322 has a quick de-asthmatic time of not more than 1 second.

The rainwater collection system is used for testing the influence of rainwater intake on the performance of the compressor, and the rainwater collection device comprises a gas-water separator, an exhaust stop valve and a water return tank, wherein the gas-water separator adopts a baffle type gas-water separator; two rainwater collecting branches are arranged, namely an exhaust pipeline rainwater collecting branch and an exhaust collector rainwater collecting branch, the exhaust pipeline is communicated with the rainwater collecting device through the exhaust pipeline rainwater collecting branch, and the exhaust collector is communicated with the rainwater collecting device through the exhaust collector rainwater collecting branch. After the rainwater in the exhaust pipeline is separated by the gas-water separator, gravity backwaters to a backwater tank; in consideration of that most of rainwater in the exhaust collector is brought into an exhaust pipeline by gas, and meanwhile, in order to avoid the influence of suction of a water pump on an outlet flow field of a gas compressor, after the test is finished, a suction pump is adopted to pump accumulated water back to a cooling tower of a cooling water system (the cooling water system is a part of the test bed system, and the cooling water system is not an invention point and is not specifically described).

The main technical indexes of the exhaust system are as follows: maximum exhaust flow rate: 25kg/s; maximum exhaust pressure: 0.6MPa; maximum exhaust temperature: 250 ℃; minimum exhaust pressure: 0.13MPa; cavity simulation range: (0.07-0.15) m3; rainwater collection flow: 1.25kg/s; rainwater separation efficiency: 99%.

The two sets of lubricating oil systems are respectively a test piece lubricating oil system and a speed increasing box/torque measuring device lubricating oil system. The lubricating oil system adopts an emergency power supply as a backup power supply, so that the lubricating oil system is ensured to have the lubricating oil continuous oil supply protection function after power failure. The test piece lubricating oil system is used for lubricating and cooling a test piece bearing and mainly comprises an oil tank, a pipeline, an oil pump, a valve, an oil filter, a warmer, a plate radiator, a temperature and pressure measuring device and the like. The oil supply path is provided with a turbine flowmeter for monitoring the lubricating oil flow so as to ensure the safe operation of the test piece. The lubricating oil system of the speed increasing box/torque measuring device is used for lubricating and cooling the speed increasing box and the torque measuring device and mainly comprises an oil tank, a pipeline, an oil pump, a valve, an oil filter, a warmer, a plate-type radiator, a temperature and pressure measuring device and the like. The oil station has a constant temperature function and a liquid level alarm function; the filter is arranged at the oil supply inlet and the oil supply outlet and has a blockage alarm function; the warmer is installed in the oil tank. The lubricating oil system is of conventional design.

The steady-state test system is mainly used for measuring parameters such as relevant pressure, temperature, flow and the like of test pieces and equipment, performing parameter processing, data communication, channel configuration, data display, data recording, parameter alarm monitoring, historical data return visit and the like. The steady-state test system mainly comprises a sensor, an instrument, a pressure scanning valve, accessories, a steady-state signal acquisition system, a computer, accessories, test software and the like. Steady state test systems also fall under conventional settings.

Example 2

In this embodiment, on the basis of embodiment 1, a linear slide is provided between the movable ring and the fixed ring to reduce the sliding resistance.

Example 3

This embodiment differs from embodiment 1 in that: the test platform of example 1 was throttled using a small-volume throttle device; when the influence test of different cavity sizes on the performance of the compressor is carried out, the cavity simulation section is arranged at the inlet of the exhaust collector, the size of the exhaust cavity can be changed by changing the volumes of the different cavity simulation sections, and the cavity simulation range is (0.07-0.15) m < 3 >.

It is apparent that the above examples are only examples for clearly illustrating the technical solution of the present invention, and are not limiting of the embodiments of the present invention. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.

Claims (10)

1. An exhaust system for a special air inlet coupling air compressor test platform is characterized in that the exhaust system is connected with an outlet of a test piece to realize exhaust collection and back pressure adjustment;

the exhaust system comprises an exhaust collection throttling device, an anti-asthma device and an exhaust pipeline, and the exhaust pipeline is communicated with the atmosphere; the exhaust collecting throttling device comprises an exhaust collector, a throttling device and an exhaust switching section, wherein the exhaust collector comprises a bearing casing and a gas collecting volute for wrapping the bearing casing, and two ends of the exhaust switching section are respectively connected with the gas collecting volute and an exhaust pipeline; the throttling device is arranged at the inner cavity of the bearing casing and comprises a fixed ring, a movable ring, a mounting ring and an axial movement straight-stroke synchronous motor, and the movable ring can axially move on the fixed ring; the de-asthmatic device comprises a pipeline which is communicated with the fixed ring and the air collecting volute, and a pneumatic quick-opening valve is arranged on the pipeline.

2. The exhaust system for a special air-in-coupling compressor test bed of claim 1, wherein the exhaust collector is designed with an equal flow rate.

3. The exhaust system for a special air-in coupling compressor test bed according to claim 1, wherein two mounting seats are respectively arranged on two sides of the bearing casing, and a central line connecting line of the two mounting seats on each side is positioned on a horizontal bisection plane of the exhaust collector.

4. The exhaust system for a special air-in-coupling compressor test bed of claim 3, wherein the mounting base is provided with reinforcing ribs to increase rigidity.

5. The exhaust system for a special air-in-coupling compressor test bed of claim 1, wherein a linear slide is provided between the movable ring and the stationary ring.

6. The exhaust system for a special air-in-coupling compressor test bed of claim 1, wherein the rapid de-surge time of the de-surge device is no more than 1 second.

7. The exhaust system for a special air-in-coupling compressor test bed of claim 1, further comprising a rainwater collection device comprising a gas-water separator, an exhaust shut-off valve, and a return water tank, the gas-water separator and the return water tank being connected by a conduit.

8. The exhaust system for a special air-in-coupling compressor test bed of claim 7, wherein the air-water separator is a baffle air-water separator.

9. The exhaust system for a special air intake coupling compressor test bed of claim 7, wherein the rainwater collecting device comprises two rainwater collecting branches, respectively: an exhaust duct rain water collection branch communicating with the exhaust duct and an exhaust collector rain water collection branch communicating with the exhaust collector.

10. The exhaust system for a special air-in-coupling compressor test bed according to claim 1, wherein the maximum exhaust flow of the exhaust system is 25kg/s, the maximum exhaust pressure is 0.6MPa, and the minimum exhaust pressure is 0.13MPa.

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