A performance test device for single-stage and double-stage oil-free screw main engine

Abstract

The present invention relates to a performance test device for a single-stage and double-stage oil-free screw main engine. The present invention includes a mechanical part and a system part; its characteristics are: the mechanical part includes an energy supply motor, a transmission tooling, and a test device frame for fixing the energy supply motor and the oil-free main engine; the system part includes an inlet and outlet system, a lubrication system and a cooling system; the test device frame includes a base, a motor base, a main engine fixing plate and a main engine base; the motor base is fixed on the base, and the energy supply motor is fixed on the motor base by bolts; the main engine fixing plate is directly welded and fixed on the base, and the main engine base is fixed on the main engine fixing plate by vibration damping pads and bolts; the transmission tooling includes a central bracket, a middle bracket conversion flange, a motor sleeve, a torque meter, a customized coupling and a main engine end coupling; the cooling system includes a first stage water cooling, a second stage water cooling, an oil cooling device, and an external water cooling device. The structural design of the present invention is reasonable and convenient for installation and testing.

Description

Technical Field

[0001] The invention relates to the field of compressor testing, in particular to a performance testing device for a single-stage or double-stage oil-free screw main engine. Background Art

[0002] Oil-free screw compressors have the characteristic of being oil-free and cannot be replaced by oil-containing machines. Oil-free screw compressors can be better applied to industries such as food and medicine. Therefore, the performance test of oil-free screw compressors is of great significance.

[0003] The commonly used performance test of oil-free screw compressors has some limitations. The main reason is that oil-free screw compressors cannot use lubricating oil to lubricate the rotor like oil-containing machines, resulting in high-temperature gas being discharged, which needs to be cooled before use. Only after the cooled gas and condensed water are treated can the performance of the oil-free screw compressor be more accurately measured. Since the discharged gas is in a high-temperature state, it needs to be cooled before the gas volume test can be carried out. The design of the existing cooling mechanism is not reasonable, resulting in a complex structure of the test device, thereby increasing the volume and weight of the test device.

[0004] When testing an oil-free screw compressor, due to its two-stage air intake requirement, more and larger pipelines are needed. Usually, the pipelines are arranged on both sides and connected by hard pipes, which makes the test bench very large and occupies a lot of space. In addition, the power, torque, and speed are mostly measured using shaft torque meters, which makes the middle connection part too long, making the installation of the performance test device very inconvenient.

[0005] In summary, the structural design of the performance test device for the oil-free screw compressor main engine commonly used at present is not reasonable enough, which is not conducive to installation and testing. Summary of the invention

[0006] The purpose of the present invention is to overcome the above-mentioned deficiencies in the prior art and to provide a performance test device for single-stage and double-stage oil-free screw main units which has a reasonable structural design and is easy to install and test.

[0007] The technical solution adopted by the present invention to solve the above problems is: the performance test device for the single-stage and double-stage oil-free screw main engine includes a mechanical part and a system part; its structural characteristics are: the mechanical part includes an energy supply motor, a transmission tooling, and a test device frame for fixing the energy supply motor and the oil-free main engine; the system part includes an intake and discharge system, a lubrication system, a cooling system, a measurement system and a monitoring system;

[0008] The energy supply motor is configured according to the performance requirements of the oil-free main engine of the compressor;

[0009] The test device frame includes a base, a motor base, a main engine fixing plate and a main engine base; the motor base is fixed to the base through a vibration-damping pad and bolts, and the energy supply motor is fixed to the motor base through bolts; the main engine fixing plate is directly welded and fixed to the base, and the main engine base is fixed to the main engine fixing plate through a vibration-damping pad and bolts;

[0010] The oil-free main engine includes a single-stage oil-free screw main engine and a double-stage oil-free screw main engine;

[0011] The transmission tooling includes a center bracket, a center bracket conversion flange, a motor sleeve, a torque meter, a customized coupling and a main engine end coupling; the middle part of the center bracket is a pipe section, and both ends of the center bracket are flanges, wherein the flange at one end is connected to the stop flange surface of the power supply motor, and the flange at the other end is used to connect to the stop flange surface of the oil-free main engine, and both are positioned and connected by stoppers and bolts; the motor sleeve is installed on the output shaft of the power supply motor and fastened by key-end bolts; one end of the torque meter with the sensing part is connected to the motor sleeve, and the other end is connected to the customized coupling; the main engine end coupling is installed on the oil-free main engine shaft, and the main engine end coupling is connected to the customized coupling and transmits power through claw plates and elastomers;

[0012] The air intake and discharge system comprises an air filter, an air intake pipeline, an air intake valve, a section of an exhaust pipeline, a section of air cooling, a three-way switching valve, a section of a steam-water separation combination, a second section of an air intake pipeline, a second section of an exhaust pipeline, a second section of air cooling, a second section of a channel valve, a first section and a second section of a combined pipeline and a second section of a steam-water separation combination; the air filter, the air intake pipeline, the air intake valve, a section of an air intake of an oil-free main engine, a section of an exhaust port of an oil-free main engine, a section of an exhaust pipeline, a section of air cooling, a three-way switching valve and a section of a steam-water separation combination are connected in sequence; one interface of the three-way switching valve, a first section and a second section of a combined pipeline and a second section of a steam-water separation combination are connected in sequence, and another interface of the three-way switching valve, a second section of an air intake pipeline, a second section of an oil-free main engine air intake, a second section of an oil-free main engine exhaust port, a second section of an exhaust pipeline, a second section of an air cooling, a second section of a channel valve, a first section and a second section of a combined pipeline and a second section of a steam-water separation combination are connected in sequence;

[0013] The cooling system includes a first stage of water cooling, a second stage of water cooling, an oil cooling device, an external water cooling device, a water inlet main pipe, a water return main pipe, a first stage of air cooling water inlet pipe, a second stage of air cooling water inlet pipe, an oil cooling water inlet pipe, a first stage of air cooling water return pipe, a second stage of air cooling water return pipe and an oil cooling water return pipe. The external water cooling device is a cooling tower. The water inlet main pipe is connected to the external water cooling device. One end of the first stage of air cooling water inlet pipe, one end of the second stage of air cooling water inlet pipe and one end of the oil cooling water inlet pipe are all connected to the water inlet main pipe. The other end of the first stage of air cooling water inlet pipe, the second stage of air cooling water inlet pipe and the oil cooling water return pipe are connected to the water inlet main pipe. The other end of the section air-cooling water inlet pipe and the other end of the oil-cooling water inlet pipe are respectively connected to the inlet of the second section water-cooling, the inlet of the first section water-cooling and the inlet of the oil cooling device, the outlet of the second section water-cooling, the outlet of the first section water-cooling and the outlet of the oil cooling device are respectively connected to one end of the section air-cooling water return pipe, one end of the second section air-cooling water return pipe and one end of the oil cooling water return pipe, the other end of the section air-cooling water return pipe, the other end of the second section air-cooling water return pipe and the other end of the oil cooling water return pipe are all connected to the return water main pipe, and the return water main pipe is connected to the external water cooling device;

[0014] The measuring system includes a thermal mass flow meter, a barrel, a nozzle, an ambient temperature and humidity sensor, an atmospheric pressure gauge, a differential pressure sensor, a temperature sensor, a pressure sensor and a pressure regulating valve;

[0015] The monitoring system includes a frequency converter, a power meter, a host computer and a control cabinet.

[0016] Preferably, the air filtering device of the present invention is installed on the power supply motor through a damping material tooling; the air intake valve is installed at the air inlet of the oil-free host; the air intake pipeline is a plastic air duct with a metal wire inside, one end of which is connected to the air outlet of the air filtering device and the other end is connected to the air inlet of the air intake valve.

[0017] Preferably, the lubrication system of the present invention comprises an oil pump, an oil extraction pipeline, a switch valve, an oil inlet pipeline, an oil flow meter, an oil filter, an overflow valve, an overflow pipeline, an oil tank, a quick connector 1, a quick connector 2, an oil inlet hose and an overflow hose. The oil pump is an industrial frequency pump, and the oil supply amount and the oil supply pressure are regulated by changing the opening of the switch valve and the overflow valve; the oil tank, the oil extraction pipeline, the switch valve, the oil pump, and then the oil output of the oil pump is divided into two paths, one path is the oil inlet pipeline, the oil filter, the oil flow meter, the quick connector 1, and the oil inlet hose, and the other path is the overflow valve, the overflow pipeline, the quick connector 2 and the overflow hose connected in sequence.

[0018] Preferably, the first section of the exhaust pipeline of the present invention is divided into pipeline one, pipeline two and pipeline three; the three-way switching valve is directly installed after the first section of air cooling; the three-way switching valve and the first section of the steam-water separation combination are connected through pipeline four; the two sections of the intake pipeline are divided into pipeline five, pipeline six and pipeline seven; the two sections of the exhaust pipeline are divided into pipeline eight, pipeline nine and pipeline ten; the two-section channel valve is directly installed after the second section of air cooling; the three-way switching valve and the two-section channel valve are both connected to the two-section steam-water separation combination through the first and second section combined pipelines.

[0019] Preferably, the pipeline 1 described in the present invention is composed of an A / D type quick connector and an expansion joint, which is divided into a female end connecting pipe section 1, a male end connecting flange 1, an expansion joint 1 and a flange fixed pipe section 1 connected in sequence; the pipeline 7 is composed of an A / D type quick connector and an expansion joint, which is divided into a female end connecting pipe section 2, a male end connecting flange 2, an expansion joint 2 and a flange fixed pipe section 2 connected in sequence; the pipeline 8 is composed of an A / D type quick connector and an expansion joint, which is divided into a female end connecting pipe section 3, a male end connecting flange 3, an expansion joint 3 and a flange fixed pipe section 3 connected in sequence; the pipelines 2, 6 and 9 are all welded and fixed to the base.

[0020] Preferably, the second pipeline of the present invention adopts the form of double elbows merged into one channel, which achieves the effect of combining multiple channels into one. When one channel is used, the other channel is sealed with a blind plate to adapt to the testing of multiple models.

[0021] Preferably, one end of the customized coupling described in the present invention is a stop countersunk surface with a through hole arranged in it, and the other end of the customized coupling is provided with a claw plate; the stop countersunk surface is fixed with the end face of the torque meter, the claw plate cooperates with the main engine end coupling, and an elastomer is placed in the middle.

[0022] Preferably, in the measuring system of the present invention, the thermal mass flowmeter is installed at the rear of the two-stage steam-water separation combination, and it is required to ensure that the length of the straight pipe section 1 at the front section of the thermal mass flowmeter is ≥10 times the inner diameter of the pipe, and the length of the straight pipe section 2 at the rear section of the thermal mass flowmeter is ≥5 times the inner diameter of the pipe; the pressure regulating valve is installed at the rear end of the thermal mass flowmeter; the gun barrel is installed at the rear end of the pressure regulating valve through the straight pipe section 3; the nozzle is installed on the gun barrel, and the differential pressure sensor, temperature sensor and pressure sensor are all connected to the gun barrel.

[0023] Preferably, the differential pressure sensor of the present invention is mainly used to test the nozzle pressure difference and the pressure difference before and after air cooling; the temperature sensor is mainly used to test the temperature, oil temperature and water temperature of each pipe section; the pressure sensor is mainly used to measure the pressure, oil pressure and water pressure of each pipe section; the ambient temperature and humidity sensor is used to measure the temperature and humidity under the current test environment conditions; the atmospheric pressure gauge is used to measure the atmospheric pressure under the current test environment conditions.

[0024] Preferably, in the monitoring system described in the present invention, the frequency converter is used to control the frequency of the power supply motor; the power meter is used to measure the power, voltage and current of the power supply motor; the host computer is used to display data and perform panel control; the control cabinet is used to connect various execution components and integrate the transmitted sensor signals and feed them back to the host computer.

[0025] Preferably, the torque meter of the present invention measures the rotational speed and torque, calculates the power in real time, and transmits the results to the host computer via a Siemens module.

[0026] Preferably, the energy supply motor of the present invention is controlled by a frequency converter to achieve the function of adjusting frequency and speed.

[0027] Preferably, the torque meter of the present invention is a disc-type torque meter, which has a structure similar to a flange pipe section and flanges on both sides have stoppers.

[0028] Preferably, when replacing the host for testing, the present invention only requires replacing the host base, the host end coupling and the mid-support conversion flange.

[0029] Compared with the prior art, the present invention has the following advantages and effects: 1. Space integration and high utilization rate: the pipeline and the base are integrated, and the intake and exhaust systems are integrated to facilitate secondary transfer.

[0030] 2. Quick connection of gas circuit and oil circuit: The gas circuit adopts A / D type quick connection, and the oil circuit adopts quick connector, such as LSQ quick connector, which can not only connect quickly, but also cut off the oil circuit to prevent oil leakage.

[0031] 3. Universal application for multiple models: Only a small part of the tooling needs to be replaced to complete the replacement test.

[0032] 4. Single-stage and double-stage universal test: The three-way switching valve and the two-stage channel valve can be used to test the single-stage host or the double-stage host.

[0033] 5. The overall structure is reasonably laid out, making it easy to install and test.

[0034] 6. Real-time monitoring and control: Through the host computer communication integrated cabinet, remote control of frequency converters, regulating valves, etc. can be carried out and changes can be made at any time.

[0035] 7. Real-time data collection and recording: The sensor transmits the signal to the host computer, collects and extracts data in real time, calculates, analyzes and records it, performs uninterrupted testing, and effectively analyzes the test conditions at different time periods. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the embodiments of the present invention and / or the technical solutions in the prior art, the drawings required for use in the embodiments and / or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0037] Figure 1 It is a structural schematic diagram of a performance test device for a single-stage and double-stage oil-free screw main engine in an embodiment of the present invention.

[0038] Figure 2 It is a three-dimensional structural schematic diagram of the mechanical part in the embodiment of the present invention.

[0039] Figure 3 It is a three-dimensional structural schematic diagram of the transmission tooling and the energy supply motor in an embodiment of the present invention.

[0040] Figure 4 It is a schematic diagram of the three-dimensional structure of the customized coupling in an embodiment of the present invention.

[0041] Figure 5 It is a three-dimensional structural schematic diagram of another viewing angle of the customized coupling in an embodiment of the present invention.

[0042] Figure 6 It is a schematic diagram of the three-dimensional structure of the intake and exhaust system in an embodiment of the present invention.

[0043] Figure 7 It is a schematic diagram of the three-dimensional structure of a part of the intake and discharge system in an embodiment of the present invention.

[0044] Figure 8 Schematic diagram of the structure of the lubrication system in the embodiment of the present invention.

[0045] Fig. 9 It is a schematic diagram of the three-dimensional structure of the cooling system in an embodiment of the present invention.

[0046] Fig.10 It is a schematic diagram of the three-dimensional structure of the measurement system in the embodiment of the present invention.

[0047] Fig.11 It is a schematic diagram of a parameter monitoring interface of a monitoring system in an embodiment of the present invention.

[0048] In the figure: 1-mechanical part; 2-system part;

[0049] 11-power supply motor; 12-test device frame; 13-oil-free main engine; 14-transmission tooling; 121-base; 122-motor base; 123-main engine fixing plate; 124-main engine base; 141-center bracket; 142-middle bracket conversion flange; 143-motor sleeve; 144-torque meter; 145-customized coupling; 146-main engine end coupling; 1451-stop countersunk surface; 1452-through hole; 1453-claw plate;

[0050] 21-intake and discharge system; 22-lubrication system; 23-cooling system; 24-measurement system;

[0051] 211-air filtration equipment; 212-intake pipeline; 213-intake valve; 214-stage exhaust pipeline; 215-stage air cooling; 216-three-way switching valve; 217-stage steam-water separation combination; 218-stage intake pipeline; 219-stage exhaust pipeline; 2110-stage air cooling; 2111-stage channel valve; 2112-stage one and two combined pipelines; 2113-stage steam-water separation combination; 221-oil pump; 222-oil extraction pipeline; 223-switch valve; 224- Oil inlet pipeline; 225-oil flow meter; 226-oil filter; 227-overflow valve; 228-overflow pipeline; 22101-quick connector 1; 22102-quick connector 2; 231-first stage water cooling; 232-second stage water cooling; 233-oil cooling equipment; 234-external water cooling equipment; 241-thermal mass flow meter; 242-barrel; 243-nozzle; 246-differential pressure sensor; 247-temperature sensor; 248-pressure sensor; 249-pressure regulating valve;

[0052] a-pipeline 1; a1-female end connecting pipe section 1; a2-male end connecting flange 1; a3-expansion joint 1; a4-flange fixed pipe section 1; b-pipeline 2; c-pipeline 3; d-pipeline 4; e-pipeline 5; f-pipeline 6; g-pipeline 7; g1-female end connecting pipe section 2; g2-male end connecting flange 2; g3-expansion joint 2; g4-flange fixed pipe section 2; h-pipeline 8; h1-female end connecting pipe section 3; h 2-male end connecting flange three; h3-expansion joint three; h4-flange fixed pipe section three; i-pipeline nine; j-pipeline ten; y1-water inlet main pipe; y2-water return main pipe; y3-one section of air-cooling water inlet pipe; y4-two sections of air-cooling water inlet pipe; y5-oil-cooling water inlet pipe; y6-one section of air-cooling water return pipe; y7-two sections of air-cooling water return pipe; y8-oil-cooling water return pipe; z1-straight pipe section one; z2-straight pipe section two; z3-straight pipe section three. DETAILED DESCRIPTION

[0053] The present invention will be further described in detail below with reference to the accompanying drawings and by way of examples. The following examples are intended to explain the present invention but the present invention is not limited to the following examples.

[0054] Example

[0055] See also Figures 1 to 11 The performance test device for the single-stage and double-stage oil-free screw main unit in this embodiment includes a mechanical part 1 and a system part 2; wherein the mechanical part 1 includes a power supply motor 11, a test device frame 12 and a transmission tooling 14, and the test device frame 12 is used to fix the power supply motor 11 and the oil-free main unit 13; the system part 2 includes an intake and exhaust system 21, a lubrication system 22, a cooling system 23, a measurement system 24 and a monitoring system.

[0056] The energy supply motor 11 in this embodiment is configured according to the performance requirements of the oil-free main unit 13 of the compressor. The oil-free main unit 13 includes a single-stage oil-free screw main unit and a double-stage oil-free screw main unit.

[0057] The test device frame 12 in this embodiment includes a base 121, a motor base 122, a mainframe fixing plate 123 and a mainframe base 124; the base 121 is fixed on a plane by expansion bolts, the motor base 122 is fixed on the base 121 by vibration-damping pads and bolts, and the power supply motor 11 is fixed on the motor base 122 by bolts; the mainframe fixing plate 123 is fixed on the base 121 by countersunk bolts, and the required threaded holes are drilled in advance, and the mainframe fixing plate 123 can also be fixed on the base 121 by direct welding. The mainframe base 124 is fixed to the mainframe fixing plate 123 by vibration-damping pads and bolts.

[0058] The transmission tooling 14 in this embodiment includes a central bracket 141, a middle bracket conversion flange 142, a motor sleeve 143, a torque meter 144, a customized coupling 145 and a main engine end coupling 146; the middle part of the central bracket 141 is a pipe section, and both ends of the central bracket 141 are flanges, wherein the flange at one end is connected to the stop flange surface of the power supply motor 11, and the flange at the other end is used to connect to the stop flange surface of the oil-free main engine 13, and both are positioned and connected by stoppers and bolts; the central bracket 141 connects the stop flange of the power supply motor 11 and the stop flange of the oil-free main engine 14. When different main engine models are replaced and their stop flanges are different, they can be transferred through the central bracket conversion flange 142. The motor sleeve 143 is installed on the output shaft of the power supply motor 11 and fastened by the key end bolt; one end of the torque meter 144 with the sensing part is connected to the motor sleeve 143, and the other end is connected to the customized coupling 145; the main engine end coupling 146 is installed on the oil-free main engine 13 shaft, and the main engine end coupling 146 is connected to the customized coupling 145 and transmits power through the claw plate and the elastic body. The inner hole of the motor sleeve 143 is adapted to the output shaft of the power supply motor 11, and the shaft end is opened with a stopper and a circle of threaded holes. One side of the torque meter 144 is fixed to the shaft end of the motor sleeve 143 through the stopper and bolts.

[0059] The intake and exhaust system 21 in this embodiment includes an air filter 211, an intake pipeline 212, an intake valve 213, a first exhaust pipeline 214, a first air cooling 215, a three-way switching valve 216, a first steam-water separation assembly 217, a second intake pipeline 218, a second exhaust pipeline 219, a second air cooling 2110, a second channel valve 2111, a first and second merged pipeline 2112 and a second steam-water separation assembly 2113. The air filter 211 is composed of an air filter housing and an air filter element. A damping material fixture is fixed above the junction box of the power supply motor 11, and then the air filter 211 is fixed on the fixture. The air filtering device 211, the air intake pipeline 212, the air intake valve 213, a first air intake port of the oil-free main unit 13, a first exhaust port of the oil-free main unit 13, a first exhaust pipeline 214, a first air cooling 215, a three-way switching valve 216 and a first steam-water separation combination 217 are connected in sequence; one interface of the three-way switching valve 216, a first and second section merging pipeline 2112 and a second section steam-water separation combination 2113 are connected in sequence, and another interface of the three-way switching valve 216, a second section air intake pipeline 218, a second section air intake port of the oil-free main unit 13, a second section exhaust port of the oil-free main unit 13, a second section exhaust pipeline 219, a second section air cooling 2110, a second section channel valve 2111, a first and second section merging pipeline 2112 and a second section steam-water separation combination 2113 are connected in sequence. One end of the air intake pipe 212 is connected to the fixed air filter device 211, and the other end is connected to the air inlet of the fixed air intake valve 213; the air intake valve 213 is fixed to the air inlet of the oil-free host 13 by bolts, and can be opened by external compressed air and turned on and off in conjunction with the solenoid valve.

[0060] The cooling system 23 in this embodiment includes a first stage of water cooling 231, a second stage of water cooling 232, an oil cooling device 233, an external water cooling device 234, a water inlet main pipe y1, a water return main pipe y2, a first stage of air-cooled water inlet pipe y3, a second stage of air-cooled water inlet pipe y4, an oil-cooled water inlet pipe y5, a first stage of air-cooled water return pipe y6, a second stage of air-cooled water return pipe y7 and an oil-cooled water return pipe y8. The external water cooling device 234 is a cooling tower. The water inlet main pipe y1 is connected to the external water cooling device 234. One end of the first stage of air-cooled water inlet pipe y3, one end of the second stage of air-cooled water inlet pipe y4 and one end of the oil-cooled water inlet pipe y5 are all connected to the water inlet main pipe y1. The other end, the other end of the two-stage air-cooling water inlet pipe y4 and the other end of the oil-cooling water inlet pipe y5 are respectively connected to the inlet of the two-stage water cooling 232, the inlet of the one-stage water cooling 231 and the inlet of the oil cooling equipment 233, the outlet of the two-stage water cooling 232, the outlet of the one-stage water cooling 231 and the outlet of the oil cooling equipment 233 are respectively connected to one end of the one-stage air-cooling return water pipe y6, one end of the two-stage air-cooling return water pipe y7 and one end of the oil cooling return water pipe y8, the other end of the one-stage air-cooling return water pipe y6, the other end of the two-stage air-cooling return water pipe y7 and the other end of the oil cooling return water pipe y8 are all connected to the return water main pipe y2, and the return water main pipe y2 is connected to the external water cooling equipment 234. The first stage water cooling 231, the second stage water cooling 232, and the oil cooling device 233 can all be based on the principle of heat exchange between media at different temperatures. Water is used for cooling here, and the external water cooling device 234 can be a cooling water tower; they are connected through the water inlet main pipe y1, the return water main pipe y2, the first stage air cooling water inlet pipe y3, the second stage air cooling water inlet pipe y4, the oil cooling water inlet pipe y5, the first stage air cooling water return pipe y6, the second stage air cooling water return pipe y7, and the oil cooling water return pipe y8.

[0061] The measurement system 24 in this embodiment includes a thermal mass flowmeter 241, a barrel 242, a nozzle 243, an environmental temperature and humidity sensor, an atmospheric pressure gauge, a differential pressure sensor 246, a temperature sensor 247, a pressure sensor 248 and a pressure regulating valve 249; the monitoring system includes a frequency converter, a power meter, a host computer and a control cabinet. The thermal mass flowmeter 241 is connected to the second-stage steam-water separation assembly 2113 through a straight pipe section z1; the pressure regulating valve 249 is connected to the thermal mass flowmeter 241 through a straight pipe section z2; the barrel 242 is connected to the pressure regulating valve 249 through a straight pipe section z3; the nozzle 243 is installed on the barrel; here, the environmental temperature and humidity sensor and the atmospheric pressure gauge are placed around the performance test device, and the differential pressure sensor 246, the temperature sensor 247, and the pressure sensor 248 are respectively installed on different pipelines of the performance test device.

[0062] The air filtering device 211 in this embodiment is installed on the power supply motor 11 through a damping material tooling; the air intake valve 213 is installed at the air inlet of the oil-free host 13; the air intake pipe 212 is a plastic air duct with a metal wire inside, one end of which is connected to the air outlet of the air filtering device 211, and the other end is connected to the air inlet of the air intake valve 213.

[0063] The lubrication system 22 in this embodiment includes an oil pump 221, an oil extraction pipeline 222, a switch valve 223, an oil inlet pipeline 224, an oil flow meter 225, an oil filter 226, an overflow valve 227, an overflow pipeline 228, an oil tank, a quick connector 22101, a quick connector 22102, an oil inlet hose and an overflow hose. The oil pump 221 is a power frequency pump. By changing the opening of the switch valve 223 and the overflow valve 227, the oil supply amount and the oil supply pressure can be adjusted; the oil tank, the oil extraction pipeline 222, the switch valve 223, the oil pump 221, and then the oil output of the oil pump 221 is divided into two paths, one path is the oil inlet pipeline 224, the oil filter 226, the oil flow meter 225, the quick connector 22101, and the oil inlet hose, and the other path is the overflow valve 227, the overflow pipeline 228, the quick connector 22102 and the overflow hose connected in sequence. The oil pump 221 is connected to the oil tank through the oil extraction pipeline 222 and the switch valve 223, and then the oil is transported to the oil cooling device 233 for cooling, and then enters the main engine bearings, gears and other places that need lubrication through the oil inlet pipeline 224, wherein the oil flow meter 225 and the oil filter 226 are installed in the oil inlet pipeline 224, which are used to monitor the oil flow and remove impurities; the other way is directly transported back to the oil tank through the overflow valve 227 and the overflow pipeline 228, which plays the role of pressure relief and flow regulation; the oil tank here can be brought by the oil-free main engine 13, or it can be external, and entering the oil-free main engine 13 also requires oil blocks, hoses, and connectors.

[0064] In this embodiment, one section of the exhaust pipeline 214 is divided into pipeline one a, pipeline two b and pipeline three c; the three-way switching valve 216 is directly installed after the first section of air cooling 215; the three-way switching valve 216 and the first section of steam-water separation combination 217 are connected through pipeline four d; the second section of the intake pipeline 218 is divided into pipeline five e, pipeline six f and pipeline seven g; the second section of the exhaust pipeline 219 is divided into pipeline eight h, pipeline nine i and pipeline ten j; the second section channel valve 2111 is directly installed after the second section of air cooling 2110; the three-way switching valve 216 and the second section channel valve 2111 are both connected to the second section of steam-water separation combination 2113 through the first and second section merging pipeline 2112.

[0065] The pipeline a in this embodiment is composed of an A / D type quick connector and an expansion joint, which is divided into a female end connecting pipe section a1, a male end connecting flange a2, an expansion joint a3 and a flange fixed pipe section a4 which are connected in sequence; the pipeline g is composed of an A / D type quick connector and an expansion joint, which is divided into a female end connecting pipe section g1, a male end connecting flange g2, an expansion joint g3 and a flange fixed pipe section g4 which are connected in sequence; the pipeline h is composed of an A / D type quick connector and an expansion joint, which is divided into a female end connecting pipe section h1, a male end connecting flange h2, an expansion joint h3 and a flange fixed pipe section h4 which are connected in sequence; the pipeline b, the pipeline f and the pipeline i are all welded and fixed to the base 121. A section of exhaust pipeline 214 is connected to a section of exhaust port of the oil-free main engine 13 and then connected to a section of air cooling 215 air inlet, which is composed of pipeline 1 a, pipeline 2 b, and pipeline 3 c connected in sequence, and pipeline 1 a is composed of a female end connecting pipe section 1 a1, a male end connecting flange 1 a2, an expansion joint 1 a3, and a flange fixing pipe section 1 a4; then the air inlet of the three-way switching valve 216 is directly connected to the exhaust port of the section of air cooling 215, and the exhaust port of the three-way switching valve 216 is divided into two routes, one route is connected to a section of steam-water separation combination 217 through pipeline 4 d, and the other route is directly connected to the first and second section combined pipeline 2112; the second section air inlet pipeline 218 connects a section of steam-water separation combination 217 and the second section air inlet of the oil-free main engine 13; it is composed of pipeline 5 e, pipeline 6 f, and pipeline 7 g connected in sequence, and pipeline 7 g is composed of a female end connecting pipe section 2 g1 , male end connecting flange 2g2, expansion joint 2g3, flange fixed pipe section 2g4; the second section exhaust pipeline 219 connects the second section exhaust port of the oil-free main engine 13 and the second section air cooling 2110 air inlet, which is composed of pipeline 8h, pipeline 9i, and pipeline 10j connected in sequence, and pipeline 8h is composed of female end connecting pipe section 3h1, male end connecting flange 3h2, expansion joint 3h3, flange fixed pipe section 3h4; then the second section channel valve 2111 air inlet is directly connected to the second section air cooling 2110 exhaust port, and the exhaust port is connected to the one-two section combined pipeline 2112; then the one-two section combined pipeline 2112 is connected to the two-section steam-water separation combination 2113; the two-section steam-water separation combination 2113 is composed of a steam-water separator and a gas-free drain valve, and all components are installed and fixed on the base 121 or the system bracket.

[0066] The pipeline 2 b in this embodiment adopts the form of merging two elbows into one channel, which achieves the effect of combining multiple channels into one. When one channel is in use, the other channel is sealed with a blind plate to adapt to the testing of multiple models.

[0067] One end of the customized coupling 145 in this embodiment is a stop countersunk surface 1451, in which a through hole 1452 is provided, and the other end of the customized coupling 145 is provided with a claw plate 1453; the stop countersunk surface 1451 is fixed with the end face of the torque meter 144, and the claw plate 1453 cooperates with the main machine end coupling 146, and an elastomer is placed in the middle.

[0068] In the measurement system 24 of the present embodiment, the thermal mass flowmeter 241 is installed at the rear of the two-stage steam-water separation assembly 2113, and it is required to ensure that the length of the straight pipe section z1 at the front section of the thermal mass flowmeter 241 is ≥10 times the inner diameter of the pipe, and the length of the straight pipe section z2 at the rear section of the thermal mass flowmeter 241 is ≥5 times the inner diameter of the pipe; the pressure regulating valve 249 is installed at the rear end of the thermal mass flowmeter 241; the barrel 242 is installed at the rear end of the pressure regulating valve 249 through the straight pipe section z3; the nozzle 243 is installed on the barrel 242, and the differential pressure sensor 246, the temperature sensor 247 and the pressure sensor 248 are all connected to the barrel 242.

[0069] The pressure difference sensor 246 in this embodiment is mainly used to test the nozzle pressure difference and the pressure difference before and after air cooling; the temperature sensor 247 is mainly used to test the temperature, oil temperature and water temperature of each pipe section; the pressure sensor 248 is mainly used to measure the pressure, oil pressure and water pressure of each pipe section; the ambient temperature and humidity sensor is used to measure the temperature and humidity under the current test environment conditions; the atmospheric pressure gauge is used to measure the atmospheric pressure under the current test environment conditions.

[0070] In the monitoring system of this embodiment, the frequency converter is used to control the frequency of the energy supply motor 11; the power meter is used to measure the power, voltage and current of the energy supply motor 11; the host computer is used to display data and perform panel control; the control cabinet is used to connect various execution components, and integrate the transmitted sensor signals and feed them back to the host computer. The frequency converter, power meter and control cabinet in the monitoring system can be integrated into one cabinet, and the signal is transmitted to the host computer through the network cable. The low-voltage level in the parameter detection interface in the host computer display interface corresponds to the first stage, and the high-voltage level corresponds to the second stage; in the figure, valve 1 represents the three-way switching valve 216; valve 2 represents the two-stage channel valve 2111; valve 3 represents the pressure regulating valve 249; valve 4 represents the switch valve 223; where valves 1 and valve 2 are switch valves, and valves 3 and valve 4 are regulating valves.

[0071] The torque meter 144 in this embodiment measures the speed, torque, and calculates the power in real time, and then transmits it to the host computer through the Siemens module. The power supply motor 11 is controlled by a frequency converter to achieve the function of adjusting the frequency and speed. The torque meter 144 selects a disc torque meter, which has a structure similar to a flange pipe section, and the flanges on both sides have stoppers. When replacing the host for testing, you only need to replace the host base 124, the host end coupling 146 and the middle support conversion flange 142.

[0072] In addition, it should be noted that the shapes and names of the parts and components of the specific embodiments described in this specification may be different, and the above content described in this specification is only an example of the structure of the present invention. All equivalent changes or simple changes made based on the structure, features and principles described in the patent concept of the present invention are included in the protection scope of the patent of the present invention. Technicians in the technical field to which the present invention belongs can make various modifications or supplements to the specific embodiments described or replace them in a similar manner, as long as they do not deviate from the structure of the present invention or exceed the scope defined by the claims, they should all fall within the protection scope of the present invention.

Claims

1. A performance test device for a single-stage or double-stage oil-free screw main unit, comprising a mechanical part (1) and a system part (2); characterized in that: The mechanical part (1) includes an energy supply motor (11), a transmission tool (14), and a test device frame (12) for fixing the energy supply motor (11) and the oil-free main engine (13); the system part (2) includes an intake and exhaust system (21), a lubrication system (22), a cooling system (23), a measurement system (24), and a monitoring system; The test device frame (12) comprises a base (121), a motor base (122), a main engine fixing plate (123) and a main engine base (124); the motor base (122) is fixed on the base (121), and the energy supply motor (11) is fixed on the motor base (122) by bolts; the main engine fixing plate (123) is fixed on the base (121), and the main engine base (124) is fixed on the main engine fixing plate (123); The transmission tooling (14) comprises a central bracket (141), a central bracket conversion flange (142), a motor sleeve (143), a torque meter (144), a customized coupling (145) and a main engine end coupling (146); the middle portion of the central bracket (141) is a pipe section, and both ends of the central bracket (141) are flanges, wherein the flange at one end is connected to the power supply motor (11), and the flange at the other end is used to connect to the oil-free main engine (13); the motor sleeve (143) is mounted on the shaft of the power supply motor (11); one end of the torque meter (144) is connected to the motor sleeve (143), and the other end is connected to the customized coupling (145); the main engine end coupling (146) is mounted on the shaft of the oil-free main engine (13), and the main engine end coupling (146) is connected to the customized coupling (145); The air intake and exhaust system (21) comprises an air filter (211), an air intake pipeline (212), an air intake valve (213), a first exhaust pipeline (214), a first air cooling (215), a three-way switching valve (216), a first steam-water separation assembly (217), a second air intake pipeline (218), a second exhaust pipeline (219), a second air cooling (2110), a second channel valve (2111), a first and second merging pipeline (2112), and a second steam-water separation assembly (2113); the air filter (211), the air intake pipeline (212), the air intake valve (213), a first air intake port of the oil-free main engine (13), and a first exhaust port of the oil-free main engine (13) , a first exhaust pipeline (214), a first air cooling (215), a three-way switching valve (216) and a first steam-water separation assembly (217) are connected in sequence; one interface of the three-way switching valve (216), a first and second section merging pipeline (2112) and a second section steam-water separation assembly (2113) are connected in sequence, and another interface of the three-way switching valve (216), a second section air intake pipeline (218), a second section air intake port of the oil-free main engine (13), a second section exhaust port of the oil-free main engine (13), a second section exhaust pipeline (219), a second section air cooling (2110), a second section channel valve (2111), a first and second section merging pipeline (2112) and a second section steam-water separation assembly (2113) are connected in sequence; The cooling system (23) comprises a first stage of water cooling (231), a second stage of water cooling (232), an oil cooling device (233), an external water cooling device (234), a water inlet main pipe (y1), a water return main pipe (y2), a first stage of air cooling water inlet pipe (y3), a second stage of air cooling water inlet pipe (y4), an oil cooling water inlet pipe (y5), a first stage of air cooling water return pipe (y6), a second stage of air cooling water return pipe (y7) and an oil cooling water return pipe (y8); the water inlet main pipe (y1) is connected to the external water cooling device (234); one end of the first stage of air cooling water inlet pipe (y3), one end of the second stage of air cooling water inlet pipe (y4) and one end of the oil cooling water inlet pipe (y5) are all connected to the water inlet main pipe (y1); the other end of the first stage of air cooling water inlet pipe (y3), the second stage of air cooling water inlet pipe (y4) and the oil cooling water return pipe (y8) are connected to the water inlet main pipe (y1); The other end of the cold water inlet pipe (y4) and the other end of the oil cooling water inlet pipe (y5) are respectively connected to the inlet of the second-stage water cooling (232), the inlet of the first-stage water cooling (231) and the inlet of the oil cooling device (233); the outlet of the second-stage water cooling (232), the outlet of the first-stage water cooling (231) and the outlet of the oil cooling device (233) are respectively connected to one end of a first-stage air cooling return water pipe (y6), one end of a second-stage air cooling return water pipe (y7) and one end of an oil cooling return water pipe (y8); the other end of the first-stage air cooling return water pipe (y6), the other end of the second-stage air cooling return water pipe (y7) and the other end of the oil cooling return water pipe (y8) are all connected to a return water main pipe (y2); and the return water main pipe (y2) is connected to an external water cooling device (234); The measuring system (24) includes a thermal mass flow meter (241), a barrel (242), a nozzle (243), an ambient temperature and humidity sensor, an atmospheric pressure gauge, a differential pressure sensor (246), a temperature sensor (247), a pressure sensor (248), and a pressure regulating valve (249); The monitoring system includes a frequency converter, a power meter, a host computer and a control cabinet.

2. The performance test device for single-stage and double-stage oil-free screw main units according to claim 1, characterized in that: The air filter device (211) is mounted on the power supply motor (11); the air intake valve (213) is mounted on the air intake port of the oil-free main unit (13); one end of the air intake pipeline (212) is connected to the air outlet of the air filter device (211), and the other end is connected to the air intake port of the air intake valve (213).

3. The performance test device for single-stage and double-stage oil-free screw main units according to claim 1, characterized in that: The lubrication system (22) comprises an oil pump (221), an oil extraction pipeline (222), a switch valve (223), an oil inlet pipeline (224), an oil flow meter (225), an oil filter (226), an overflow valve (227), an overflow pipeline (228), an oil tank, a first quick connector (22101), a second quick connector (22102), an oil inlet hose and an overflow hose. The oil tank, the oil extraction pipeline (222), the switch valve (223) and the oil pump (221) are connected in sequence. Then, the oil output of the oil pump (221) is divided into two paths, one path is the oil inlet pipeline (224), the oil filter (226), the oil flow meter (225), the first quick connector (22101) and the oil inlet hose, and the other path is the overflow valve (227), the overflow pipeline (228), the second quick connector (22102) and the overflow hose.

4. The performance test device for single-stage and double-stage oil-free screw main units according to claim 1, characterized in that: The first exhaust pipeline (214) is divided into pipeline one (a), pipeline two (b) and pipeline three (c); the three-way switching valve (216) is installed after the first air cooling (215); the three-way switching valve (216) and the first steam-water separation assembly (217) are connected via pipeline four (d); the second air intake pipeline (218) is divided into pipeline five (e), pipeline six (f) and pipeline seven (g); the second exhaust pipeline (219) is divided into pipeline eight (h), pipeline nine (i) and pipeline ten (j); the second channel valve (2111) is installed after the second air cooling (2110); the three-way switching valve (216) and the second channel valve (2111) are both connected to the second steam-water separation assembly (2113) via a first and second combined pipeline (2112).

5. The performance test device for single-stage and double-stage oil-free screw main units according to claim 4, characterized in that: The pipeline 1 (a) is composed of an A / D type quick connector and an expansion joint, and is divided into a female end connecting pipe section 1 (a1), a male end connecting flange 1 (a2), an expansion joint 1 (a3), and a flange fixed pipe section 1 (a4) which are connected in sequence; the pipeline 7 (g) is composed of an A / D type quick connector and an expansion joint, and is divided into a female end connecting pipe section 2 (g1), a male end connecting flange 2 (g2), an expansion joint 2 (g3), and a flange fixed pipe section 2 (g4) which are connected in sequence; the pipeline 8 (h) is composed of an A / D type quick connector and an expansion joint, and is divided into a female end connecting pipe section 3 (h1), a male end connecting flange 3 (h2), an expansion joint 3 (h3), and a flange fixed pipe section 3 (h4) which are connected in sequence; the pipeline 2 (b), the pipeline 6 (f), and the pipeline 9 (i) are all fixed to the base (121).

6. The performance test device for single-stage and double-stage oil-free screw main units according to claim 4, characterized in that: The pipeline 2 (b) adopts the form of merging two elbows into one channel, which achieves the effect of combining multiple channels into one. When one channel is used, the other channel is sealed with a blind plate to adapt to the testing of multiple models.

7. The performance test device for single-stage and double-stage oil-free screw main units according to claim 1, characterized in that: One end of the customized coupling (145) is a stop countersunk surface (1451), in which a through hole (1452) is provided, and the other end of the customized coupling (145) is provided with a claw plate (1453); the stop countersunk surface (1451) is fixed with the end face of the torque meter (144), and the claw plate (1453) is matched with the main machine end coupling (146).

8. The performance test device for single-stage and double-stage oil-free screw main units according to claim 1, characterized in that: In the measurement system (24), the thermal mass flowmeter (241) is installed at the rear of the two-stage steam-water separation assembly (2113), and it is required to ensure that the length of the straight pipe section 1 (z1) at the front section of the thermal mass flowmeter (241) is ≥10 times the inner diameter of the pipe, and the length of the straight pipe section 2 (z2) at the rear section of the thermal mass flowmeter (241) is ≥5 times the inner diameter of the pipe; the pressure regulating valve (249) is installed at the rear end of the thermal mass flowmeter (241); the gun barrel (242) is installed at the rear end of the pressure regulating valve (249) through the straight pipe section 3 (z3); the nozzle (243) is installed on the gun barrel (242), and the differential pressure sensor (246), the temperature sensor (247) and the pressure sensor (248) are all connected to the gun barrel (242).

9. The performance test device for single-stage and double-stage oil-free screw main units according to claim 1, characterized in that: The pressure difference sensor (246) is used to test the nozzle pressure difference and the pressure difference before and after air cooling; the temperature sensor (247) is used to test the temperature, oil temperature and water temperature of each pipe section; the pressure sensor (248) is used to measure the pressure, oil pressure and water pressure of each pipe section; the ambient temperature and humidity sensor is used to measure the temperature and humidity under the current test environment conditions; the atmospheric pressure gauge is used to measure the atmospheric pressure under the current test environment conditions.

10. The performance test device for single-stage and double-stage oil-free screw main units according to claim 1, characterized in that: In the monitoring system, the frequency converter is used to control the frequency of the energy supply motor (11); the power meter is used to measure the power, voltage and current of the energy supply motor (11); the host computer is used to display data and perform panel control; and the control cabinet is used to connect various execution components and integrate the transmitted sensor signals and feed them back to the host computer.

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