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 intake coupling compressor test platform. The exhaust system is connected to the outlet of a test piece to realize exhaust collection and back pressure adjustment; the exhaust system includes an exhaust collection and throttling device, and an exhaust device. And the exhaust pipe, the exhaust pipe is connected with the atmosphere; the exhaust gas collection and throttling device includes an exhaust collector, a throttling device and an exhaust transition section, and the exhaust collector includes a load-bearing casing and a wrapping load-bearing casing The gas collecting volute, the two ends of the exhaust transition section are respectively connected with the gas collecting volute and the exhaust pipe; the throttling device is set at the inner cavity of the bearing casing, and the throttling device includes a fixed ring, a moving ring, and a mounting ring and an axially moving linear stroke synchronous motor, and the moving ring moves axially on the fixed ring; the panting device includes a pipeline connecting 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 adjustment of the compressor outlet back pressure and the back cavity, slow breathing and fast breathing, to ensure the accurate capture of the instability boundary of the compressor and the measurement of the instability characteristic flow field.

Description

Exhaust system for special intake coupled compressor test platform

technical field

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

Background technique

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

Based on the fact that pressure is easier to measure than other parameters and is sensitive to aerodynamic instability, traditional instability detection usually arranges a total pressure or wall static pressure sensor at the outlet of the compressor, and uses the pressure signal collected by the sensor as an input signal. The extraction of pressure features is used to judge whether the compressor enters a surge or stall state. Since the design principle of the traditional instability detection system is to analyze a single outlet pulsating pressure, it is impossible to accurately locate the first stage of instability, which seriously affects the effective acquisition of the instability boundary and the safety of the test.

A key factor that affects the accurate acquisition of the compressor instability boundary is the exhaust system of the compressor intake distortion test bench. At present, technicians have further studied the problem of compressor instability by exploring related improvements to the exhaust system. For example, the announcement number is CN203616138U The patent discloses an exhaust throttling device for axial flow compressor performance test, which is based on the structural improvement of the exhaust throttling device of the original compressor tester. The device is a set consisting of a moving disc 2 and a static disc The exhaust throttle valve composed of 1, the static disk 1 and the moving disk 2 have 8 uniformly distributed blocking pieces in the circumferential direction, and there is an air circulation space between each blocking piece, and the exhaust throttle valve is installed in the compressor test equipment Inside the exhaust casing, and immediately at the rear end of the test piece. In the design, the air circulation space of the static disk 1 is slightly smaller than the area of the corresponding moving disk 2 blocking piece. During the test, the moving disk 2 is controlled to adjust the exhaust area to achieve the purpose of adjusting the exhaust flow of the test piece. After the improvement is completed, the impact of the exhaust cavity effect on the performance parameters of the compressor is greatly reduced, and the test work efficiency is improved. Looking at the patented technical solution, although the accuracy of the performance parameters of the compressor has been improved to a certain extent, it still cannot assist in the accurate capture of the instability boundary of the compressor and the measurement of the characteristic flow field of the instability.

Contents of the invention

The technical problem to be solved by the present invention is to overcome the defects of the prior art and provide an exhaust system for a special air intake coupled compressor test platform.

The object of the present invention is achieved through the following technical solutions:

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

The exhaust system includes an exhaust collection and throttling device, a panting device and an exhaust pipe, and the exhaust pipe is connected to the atmosphere; the exhaust collection and throttling device includes an exhaust collector, a throttling device and an exhaust transition section, and the exhaust The collector includes a load-bearing casing and a gas-collecting volute that wraps the load-bearing casing, and the two ends of the exhaust transfer section are respectively connected with the gas-collecting volute and the exhaust pipe; the throttling device is arranged in the inner cavity of the load-bearing casing At the position, the throttling device includes a fixed ring, a moving ring, a mounting ring and an axially movable linear stroke synchronous motor, and the moving ring can move axially on the fixed ring; the exhaust device includes a pipeline connecting the fixed ring and the air-collecting volute , Pneumatic quick opening valve is set on the pipeline.

Further, the exhaust gas collector adopts an equal flow velocity design.

Further, two mounting seats are respectively provided on both sides of the load-bearing casing, and the line connecting the centerlines of the two mounting seats on each side is on the horizontal mid-section of the exhaust collector.

Furthermore, reinforcing ribs are provided on the mounting base to increase rigidity.

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

Further, the rapid anti-breathing time of the anti-breathing device is not greater than 1 second.

Further, the exhaust system also includes a rainwater collection device, the rainwater collection device includes a gas-water separator, an exhaust stop valve and a return tank, and the gas-water separator and the return tank are connected through pipelines.

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

Furthermore, the rainwater collection device includes two rainwater collection branches, namely: the exhaust pipe rainwater collection branch connected to the exhaust pipe and the exhaust collector rainwater collection branch connected to the exhaust collector.

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

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

The exhaust system can realize the adjustment of the compressor outlet back pressure and the back cavity, as well as the slow-speed compression and fast withdrawal functions of the compressor, so as to ensure the accurate capture of the instability boundary of the compressor and the measurement of the instability characteristic flow field.

Description of drawings

Fig. 1 is the structural schematic diagram of the special air intake coupled compressor test bench described in Embodiment 1 of the present invention;

Fig. 2 is the structural front view of the special air intake coupling compressor test bench described in Embodiment 1 of the present invention;

Fig. 3 is the top view of the structure of the special air intake coupling compressor test bench described in Embodiment 1 of the present invention;

Fig. 4 is the overall installation effect diagram of the special air intake coupling compressor test bench described in Embodiment 1 of the present invention;

Fig. 5 is a schematic structural diagram of the axial air inlet port described in Embodiment 1 of the present invention;

Fig. 6 is a schematic structural diagram of the boundary layer suction inlet port described in Embodiment 1 of the present invention;

Fig. 7 is A-A sectional view among Fig. 6;

Fig. 8 is a schematic diagram of the structure of the rainwater intake interface described in Embodiment 1 of the present invention;

Fig. 9 is a three-dimensional structural diagram of the rainwater intake device in Fig. 8;

Fig. 10 is a schematic structural diagram of the temperature distortion air intake interface described in Embodiment 1 of the present invention;

Fig. 11 is a schematic diagram of the structure of the S-shaped elbow air inlet port described in Embodiment 1 of the present invention;

Fig. 12 is a structural principle diagram of the exhaust system described in Embodiment 1 of the present invention;

Fig. 13 is a schematic structural view of the exhaust gas collection and throttling device described in Embodiment 1 of the present invention;

Figure 14 is a schematic structural view of the exhaust gas collector described in Embodiment 1 of the present invention;

Fig. 15 is a schematic structural diagram of the throttling device described in Embodiment 1 of the present invention;

Fig. 16 is a schematic structural view of the anti-asthma device according to Embodiment 1 of the present invention.

Detailed ways

In order to clearly illustrate the technical features of this solution, the technical solution will be described in detail below through specific implementation modes and in conjunction with the accompanying drawings.

In the following description, many specific details are set forth in order to fully understand the application, but the application can also be implemented in other ways different from those described here, therefore, the protection scope of the application is not limited by the specific details disclosed below. EXAMPLE LIMITATIONS.

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" and other indicated orientations or positional relationships are based on the orientations or positional relationships shown in the drawings , is only for the convenience of describing the present application and simplifying the description, but does not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present application. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of these features. In the description of the present application, "plurality" means two or more, unless otherwise specifically defined.

In this application, terms such as "installation", "connection", "connection" and "fixation" should be interpreted in a broad sense, for example, it can be a fixed connection or a detachable connection, unless otherwise clearly specified and limited. , or integrated; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection or an indirect connection through an intermediary, it can be the internal communication of two components or the interaction relationship between two components . Those of ordinary skill in the art can understand the specific meanings of the above terms in this application according to specific situations.

In the present application, unless otherwise clearly specified and limited, a first feature being "on" or "under" a second feature may mean that the first and second features are in direct contact, or that the first and second features are indirect through an intermediary. touch. In the description of this specification, descriptions referring to the terms "one embodiment", "some embodiments", "example", "specific examples", or "some examples" mean that specific features described in connection with the embodiment or example , structure, material or characteristic is included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the described specific features, structures, materials or characteristics may be combined in any suitable manner in any one or more embodiments or examples.

Example 1

The special intake coupled compressor test platform shown in Figures 1 to 4 includes frequency conversion power system, speed-up transmission system 1, special intake simulation system 2, exhaust system 3, lubricating oil system and steady-state test system.

The frequency conversion power system is connected with the speed-increasing transmission system. The frequency conversion power system includes an AC frequency conversion motor and realizes constant torque and constant power stepless speed regulation of the AC frequency conversion motor to provide stable power for the test piece;

The speed-up transmission system 1 includes a speed-up gearbox and drives the test piece to rotate through the output shaft of the speed-up gearbox, and simultaneously realizes high-precision measurement of transmission torque and rotational speed;

The special air intake simulation system 2 is connected to the air inlet of the test piece to realize the axial air intake of the test piece to realize the simulation of the extreme air intake conditions of total pressure, swirl flow, rain and fog;

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

The steady-state test system is used for the measurement of pressure, temperature and flow parameters of test pieces and test platforms; parameter processing; data communication; channel configuration; data display and recording.

Among them, the frequency conversion power system adopts AC frequency conversion motor to meet the precise control requirements of the compressor speed, mainly composed of medium voltage switchgear, frequency converter, frequency conversion motor (asynchronous squirrel cage motor), rotary encoder, control cabinet, automation and monitoring system Composition, the frequency conversion power system belongs to the conventional setting.

The speed increase transmission system is mainly used for speed increase, power transmission and torque measurement. The torque measuring device is external and integrated at the output end of the speed increase box, leaving enough space for the installation of the test piece, which is convenient for test installation and inspection. In addition to the speed-up gearbox, the speed-up transmission system also includes a low-speed coupling that connects the speed-up box with the variable frequency power system, a torque sensor for measuring the torque of the test piece, a high-speed coupling connected with the test piece, and The installation platform, the bracket, and the gearbox adopt a two-stage herringbone gear parallel shaft double-shunt transmission structure gearbox, single input, single output, and the input shaft and output shaft are coaxially arranged. The low-speed shaft and intermediate shaft of the gearbox are supported by rolling bearings, while the high-speed shaft is supported by a five-watt tilting pad sliding bearing; the gears and bearings are lubricated by forced oil injection, and the oil circuit is an internal oil circuit to meet the bidirectional rotation of the gearbox. According to the requirements of the gear meshing and meshing outlet, a reasonable amount of oil is distributed; the gearbox is designed with oil inlet and outlet holes, oil enters the side and returns oil at the bottom.

The special air intake simulation system is shown in Figure 2 and Figure 3, including an axial air intake system 21 and two parallel light rails laid on the ground below the axial air intake system, and the axial air intake system includes flow tubes 211 connected in sequence , diffuser section 212, intake control valve 213, large-angle diffuser section 214 and stable section 215, the flow tube 211 is used to measure the intake air flow of the test piece, the flow tube includes a bell mouth and a straight pipe section, and the diffuser section 212 includes a flow tube to the inlet The front diffuser section between the air regulating valve and the rear diffuser section between the air intake regulating valve and the stable section, the rear diffuser section is provided with a first orifice rectification, and the stable section 215 is provided with a second orifice plate and a honeycomb in sequence along the airflow direction and rectification network. The parts of the axial intake system are connected by flange bolts, and the flanges are sealed by installing rubber asbestos gaskets and O-rings. There are also a plurality of support frames with rollers dispersedly installed under the axial air intake system, two of which are scattered in the stable section, a support frame is provided in the front diffuser section, and a support frame 22 is provided in the air intake control valve. The support frame adopts Q235 profiles and plates are welded, aged, and integrally processed and formed. The rollers on the support frame can realize the axial air intake system to move back and forth along the light rail, which is convenient for disassembly and assembly of test pieces.

In order to ensure the accuracy of flow measurement, the flow tubes in this embodiment are divided into three groups (see the table below), and the air velocity coefficient λ in each group of flow tubes ranges from 0.2 to 0.6. Specifically, the corresponding flow rate can be selected according to the flow range of the test compressor. Flow tube inner diameter D.

Flow Tube Diameter and Measuring Range Comparison Table

serial number Flow measurement range (kg/s) Throat diameter (mm) 1 10～25 374 2 4.8～12 276 3 (2.5～5)kg/s 177

There is an air intake filter at the inlet of the flow tube. The air intake filter is mainly used to filter the dust in the atmosphere to ensure that the air entering the compressor test piece is clean and clean. The filter is a metal filter product.

In the diffusion section, the expansion angle of the front diffusion section is 5°~10° to ensure that the air flow is not easy to separate, there is a small loss, a relatively uniform flow field and small air flow pulsation, to ensure the accuracy of flow measurement; at the same time, in order to shorten the rear diffusion segment length, the post-diffusion section adopts a large-angle structure, that is, the full expansion angle of the post-diffusion section is 40°-50°. The thickness of the first orifice plate in the post-diffusion section is 12-18mm. The first orifice plate is uniformly opened with a diameter of Φ8-Φ12 and an opening rate of 45%-50%.

The function of the stabilizing section is to rectify the air intake. The thickness of the second orifice plate in the stabilizing section is 12-18mm, and the holes are evenly opened on the second orifice plate. The diameter of the hole is Φ8-Φ12, and the opening rate is 45%-50%. The honeycomb tube is a regular hexagon, the diameter of the inscribed circle is 15-25mm, the length is 350-450mm, and the wall thickness is 0.1-0.15mm; there are two rectification nets in the stable section, two rectification nets, and the rectification mesh number is 20 ～30, the mesh size is 1～2mm, the wire diameter is 0.2～0.5mm, the opening rate is 60%～65%, and the square hole screen is made of industrial metal wire (GB/T5330-1985); the first rectifying network The distance from the honeycomb is 350-450mm, and the distance between the second rectification network and the first rectification network is 350-450mm.

Four wall static pressure measuring points are set at the entrance of the second orifice plate and the honeycomb entrance of the stable section, and four total temperature measuring points, four five-point total pressure measuring points, and four static pressure measuring points are set behind the rectification network to measure the airflow parameter.

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

A: The structure of the axial air intake interface as shown in Figure 5: the stable section 215 of the axial air intake system is connected to the air inlet of the test piece through a flexible connector 41, and the flexible connector can be specifically an expansion joint, and the stable section 215 and A connecting plate 42 is installed at the junction of the flexible connecting piece 41 for sealing; when carrying out the test of the influence of the axial intake on the performance of the compressor, the axial intake volute is placed in the stable section to simulate the condition of the axial intake flow.

B: Boundary layer suction inlet interface structure as shown in Figure 6 and Figure 7: including the boundary layer suction inlet device 43 partially installed in the stable section, the boundary layer suction inlet device is located at the end of the stable section and the test Part air inlet connection; the boundary layer suction air intake device 43 is a spherical structure with a larger through hole in the center, and the end face of the through hole in the stable section 215 is provided with a mounting plate 431 whose length spans the diameter of the stable section to make the boundary layer The suction and intake device is stably installed in the stable section; when carrying out the test of the influence of the boundary layer suction and intake on the performance of the compressor, the boundary layer suction and intake device is installed in the stable section of the intake system through the mounting plate, simulating the boundary layer suction and intake airflow conditions.

C: the structure of the rainwater intake interface shown in Figure 8 and Figure 9: including the water swallowing frame 44 installed at the air inlet of the test piece, the shrinkage section 216 is also provided between the water swallowing frame 44 and the stable section 215, this The contraction section is part of the axial air intake system; as shown in Figure 9, the water-swallowing frame 44 includes an outer ring structure 441 and an inner ring structure 442, between the outer ring structure and the inner ring structure A plurality of pipes 443 are arranged at intervals to connect, the outer ring structure is connected with a water inlet 444, and a plurality of water outlet nozzles 445 are evenly distributed on the inner ring structure, and the direction of the water outlet nozzles 445 is along the axial direction of the air intake system 21. The direction of air flow is set; when carrying out the test of the influence of the intake of rainwater on the performance of the compressor, the water swallowing frame is installed at the inlet of the compressor to simulate the working condition of the compressor absorbing rainwater.

D: The temperature distortion inlet interface structure as shown in Figure 10: in order to set the electric heater 45 in the stable section 215, a contraction section 216 and a flexible connector 41 are also provided between the stable section 215 and the air inlet of the test piece, At this time, the contraction section is part of the axial intake system, and the flexible connector is preferably an expansion joint; when carrying out the test of the influence of temperature distortion intake air on the performance of the compressor, an electric heater is added in the stable section to realize the compressor Intake air temperature distortion.

E: The structure of the inlet port of the S-bend as shown in Figure 11: it includes the S-bend inlet 46 connected to the stable section 215, and the other end of the S-bend is connected to the inlet of the test piece. Through connection, the connecting plate 42 is arranged at the junction of the stabilizing section 215 and the S-bend pipe inlet 46 for sealing. When carrying out the test of the influence of the S-bend intake on the performance of the compressor, the S-bend inlet is installed at the compressor inlet to simulate the S-bend intake conditions of the compressor.

The function of the above-mentioned shrinking section is to shrink and accelerate the airflow coming out of the stable section, and to ensure the quality of the flow field (the inlet velocity surge degree of the test piece is not more than 3%, and the total pressure unevenness of the test piece inlet is not more than 5%). The entrance of the contraction section is the exit of the stable section, and the contraction section adopts a bicubic curve shape.

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

Back pressure and back cavity adjustable exhaust system (exhaust system) is used for exhaust collection and back pressure adjustment in the research of coupling characteristics of compressor components and axial intake system. The main function is to realize the outlet back pressure of the compressor test piece And the back cavity can be adjusted, as well as the compressor's slow-speed breathing and fast-winding functions, to ensure accurate capture of the instability boundary of the compressor and measurement of the characteristic flow field of the instability.

Specifically, as shown in Figure 12 and Figure 13, the back pressure and back cavity adjustable exhaust system includes an exhaust gas collection and throttling device 31, an anti-breathing device 32, an exhaust pipe 33 and a rainwater collection device (not shown), Exhaust pipe 33 communicates with the atmosphere; in Figure 13, the exhaust gas collection throttling device includes exhaust collector 311, throttling device 312, exhaust transition section 313 and support 314, as shown in Figure 14, exhaust gas collection The device includes a load-bearing casing 3111 and a gas-collecting volute 3112 that wraps the load-bearing casing. The load-bearing casing is welded by forgings, and the gas-collecting volute is welded by plates. Connection, the air-collecting volute is not under pressure, and the cross-section of the air-collecting volute 3112 is square, which is convenient for processing. The load-bearing casing is the test piece and the main load-bearing casing of the exhaust throttling device, and bears the aerodynamic force. In order to ensure sufficient rigidity, it is welded by forgings. The exhaust collector 311 is designed with equal flow velocity. Both ends of the gas transfer section 313 are respectively connected to the gas collecting volute and the exhaust pipe.

Two mounting bases 3113 are arranged on both sides of the load-bearing casing 3111, and reinforcing ribs are arranged on the mounting bases to increase rigidity. The mounting seat is provided with a horizontal key to ensure that the height of the rotor axis of the test piece remains unchanged and no lateral deflection occurs during hot operation. Referring to Figure 13, the exhaust collector is connected and supported by four supports 314 and four mounting seats 3113 on the load-bearing casing. The material of the supports is HT200, and each support is connected to the basic installation platform of the test bench through T-bolts. Connection, the upper surface adjusts the position of the load-bearing casing by adjusting the inclined iron to ensure that the axes of the test piece and the speed-increasing transmission system are concentric.

In order to reduce the exhaust loss, reduce the degree of exhaust turbulence, and improve the pressure ratio test range and test accuracy, the exhaust system is not equipped with exhaust gate valve throttling, and a small cavity throttling device as shown in Figure 15 is used to regulate the exhaust gas. Back pressure; the throttling device 312 is set in the inner cavity of the load-bearing casing 3111. The throttling device 312 includes a fixed ring 3121, a moving ring 3122, a mounting ring 3123 and an axially moving linear stroke synchronous motor 3124. The motor is provided with a push rod and a moving The push rod pushes the moving ring 3122 to move axially on the fixed ring 3121; when working, the moving ring moves axially on the fixed ring to cover the window of the fixed ring. Gas back pressure.

The exhaust system of the present invention uses a quick-opening valve to relieve panting. As shown in FIG. 16 , the panting exhausting device 32 includes a pipeline 321 communicating with a fixed ring 3121 and an air-collecting volute 3112 , and a pneumatic quick-opening valve 322 is arranged on the pipeline. During the test, the compressed gas at the outlet of the test piece was collected to the air collecting volute 3112 through the hose. When the compressor surges, quickly open the pneumatic quick-opening valve 322 downstream of the air-collecting volute, quickly release part of the airflow, and exit the surge. The anti-pnea device 32 can realize fast anti-pnea to ensure the safety of the test. Pneumatic quick-opening valve 322 has a rapid panting time of less than 1 second.

The rainwater collection system is used for the test of the influence of the intake of rainwater on the performance of the compressor. The rainwater collection device includes a gas-water separator, an exhaust stop valve and a return tank. The gas-water separator adopts a baffle-type gas-water separator; two rainwater The collection branches are respectively the rainwater collection branch of the exhaust pipe and the rainwater collection branch of the exhaust collector. The exhaust pipe and the rainwater collection device are connected through the rainwater collection branch of the exhaust pipe. The exhaust collector and the rainwater collection The devices are connected through the rainwater collection branch of the exhaust collector. After the rainwater in the exhaust pipe is separated by the gas-water separator, it returns to the water return tank by gravity; considering that most of the rainwater in the exhaust collector is brought into the exhaust pipe by the gas, and at the same time, in order to avoid the suction of the water pump from the outlet of the compressor The flow field brings influence. After the test, the suction pump is used to pump the accumulated water back to the cooling water tower of the cooling water system (the cooling water system is part of the system of this test bench. Since the cooling water system is not an invention point, no specific description is given. ).

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

There are two sets of lubricating oil systems, which are the lubricating oil system of the test piece and the lubricating oil system of the gearbox/torque gauge. The lubricating oil system adopts the emergency power supply as a backup power supply to ensure that the lubricating oil system has the function of continuous lubricating oil supply protection after power failure. The lubricating oil system of the test piece is used for the lubrication and cooling of the bearing of the test piece. It is mainly composed of oil tank, pipeline, oil pump, valve, oil filter, heater, plate radiator, temperature and pressure measuring device, etc. A turbine flowmeter is installed on the oil supply line to monitor the flow of lubricating oil to ensure the safe operation of the test piece. Gear box/torque sensor lubricating oil system is used for lubrication and cooling of the gear box and torque sensor, mainly composed of oil tank, pipeline, oil pump, valve, oil filter, heater, plate radiator, temperature and pressure measuring device and so on. The oil station has a constant temperature function and a liquid level alarm function; a filter is installed at the inlet and outlet of the oil supply, and the filter has a clogging alarm function; the heater is installed in the fuel tank. The oil system is a conventional setting.

The steady-state test system is mainly used for the measurement, parameter processing, data communication, channel configuration, data display, data recording, parameter alarm monitoring, historical data return visit and other functions of test pieces and equipment related parameters such as pressure, temperature and flow. The steady-state test system is mainly composed of sensors and instruments, pressure scanning valves and their accessories, steady-state signal acquisition systems, computers, accessories and accessories, and test software. Steady-state test systems are also routine setups.

Example 2

This embodiment is based on Embodiment 1, and a linear slide rail is provided between the moving ring and the fixed ring to reduce sliding resistance.

Example 3

The difference between this embodiment and embodiment 1 is that the test platform of embodiment 1 uses a small cavity throttling device to throttle; in this embodiment, when carrying out the test of the influence of different cavity sizes on the performance of the compressor, the exhaust The inlet of the collector is equipped with a cavity simulation section, and the size of the exhaust cavity can be changed by changing the volume of different cavity simulation sections. The cavity simulation range is (0.07-0.15) m3.

Apparently, the above-mentioned embodiments are only examples for clearly illustrating the technical solution of the present invention, rather than limiting the implementation of the present invention. For those of ordinary skill in the art, other changes or changes in different forms can be made on the basis of the above description. It is not necessary and impossible to exhaustively list all the implementation manners here. All modifications, equivalent replacements and improvements made within the spirit and principles of the present invention shall be included within the protection scope of the claims of the present invention.

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.

Images