Medical air compressor performance detection device and detection method

Abstract

The invention relates to the technical field of air compressor detection, in particular to a medical air compressor performance detection device and method.The medical air compressor performance detection device comprises an operation table, a gas testing system and a control system.The gas testing system comprises at least two gas storage cylinders, a plurality of nozzle systems, a plurality of tee joints, a plurality of electromagnetic valves and regulating valves; the air inlet end of the oil-free air compressor is sequentially connected with a three-way valve, a pressure reducing valve, an oil-water separator and a filter, the exhaust end of the oil-free air compressor passes through a first filter and then is divided into two branches through a first tee joint, and a second tee joint is connected between a second electromagnetic valve and a one-way valve. The second tee joint is connected with a manual adjusting valve and an automatic adjusting valve in parallel through a third tee joint, the third tee joint is combined into one path through a fourth tee joint and is sequentially connected with a plurality of tee joints so as to be connected with a plurality of nozzle systems and exhaust silencers, and wireless transmission of test data can be achieved. The system has the characteristics of complete test items, high automation degree and wide test range.

Description

Technical Field

[0001] The present invention relates to the technical field of air compressor detection, and particularly to a performance detection device and method for a medical air compressor. Background Art

[0002] As a key device in the medical field, the medical oil-free air compressor is used to generate compressed air to drive various medical devices and instruments, providing them with sufficient and clean power sources. To ensure its stability and reliability, the performance detection of the medical oil-free air compressor is crucial.

[0003] Currently, there are many types of medical oil-free air compressors, but they have the same function. Among them, the piston-type oil-free air compressor is widely used, while there are few dedicated performance detection devices for medical piston-type oil-free air compressors. Moreover, most performance detection devices still adopt traditional manual or semi-automatic detection methods, which are not only time-consuming and laborious, but also have incomplete detection items and cannot upload relevant detection data, leaving room for improvement. Therefore, there is an urgent need to develop a dedicated performance detection device for medical piston-type oil-free air compressors. Summary of the Invention

[0004] The purpose of the present invention is to provide a performance detection device and method for a medical air compressor in view of the deficiencies of the prior art, so as to achieve the purpose of real-time detection of the performance of the piston-type oil-free air compressor.

[0005] To achieve the above purpose, the present invention provides the following technical solutions:

[0006] In the first aspect, the present invention provides a performance detection device for a medical air compressor, including: an operation table, a gas testing system, and a control system;

[0007] The operation table is used to set the oil-free air compressor to be tested, and the control system includes a data acquisition module, a data storage module, and a control processing module, and is used to regulate the operating state of the gas detection system;

[0008] The gas testing system includes at least two gas storage cylinders, multiple nozzle systems, multiple three-way joints, multiple solenoid valves and regulating valves. The intake end of the oil-free air compressor is sequentially connected to a three-way valve, a pressure reducing valve, an oil-water separator and a filter. The exhaust end of the oil-free air compressor is divided into two branches through the first three-way joint after passing through the first filter. One of the branches is connected to the bottom of the first gas storage cylinder, and the other branch is connected to the bottom of the second gas storage cylinder through the first solenoid valve. The upper parts of the first gas storage cylinder and the second gas storage cylinder are connected in series with the second solenoid valve and a check valve through a pipeline. Manual stop valves are connected to the bottoms of both the first gas storage cylinder and the second gas storage cylinder. A second three-way joint is connected between the second solenoid valve and the check valve, and a manual regulating valve and an automatic regulating valve are connected in parallel through the second three-way joint and the third three-way joint. The third three-way joint is combined into one path through the fourth three-way joint and is sequentially connected to multiple three-way joints to connect multiple nozzle systems and an exhaust muffler. Among them, a pipeline is connected to the rear side of each nozzle system, and each pipeline is connected in series with a solenoid valve and a three-way joint. The ends of multiple three-way joints are combined into one path through a three-way joint and connected to a pressure transmitter. The unloading port of the oil-free air compressor is connected to the lower part of the first gas storage cylinder through a pressure controller.

[0009] In some embodiments, the multiple nozzle systems include four nozzle systems. After being combined into one path, the fourth three-way joint is sequentially connected to the exhaust muffler, the first nozzle system, the second nozzle system, the third nozzle system, and the rear part of the fourth nozzle system through the fifth three-way joint, the sixth three-way joint, the seventh three-way joint, the eighth three-way joint, and the eighth three-way joint. Third solenoid valves, fourth solenoid valves, fifth solenoid valves, sixth solenoid valves, and seventh solenoid valves are arranged between the three-way joints passed through and the exhaust muffler, the first nozzle system, the second nozzle system, the third nozzle system, and the fourth nozzle system. Pipelines are connected to the rear sides of the first nozzle system, the second nozzle system, the third nozzle system, and the fourth nozzle system. Each pipeline is sequentially connected in series with the eleventh solenoid valve, the tenth solenoid valve, the ninth solenoid valve, and the eighth solenoid valve and is sequentially connected to the eleventh three-way joint, the tenth three-way joint, the ninth three-way joint, and the ninth three-way joint.

[0010] In some embodiments, the front shaft end of the crankshaft of the oil-free air compressor is sequentially connected to a digital display tachometer, a torque tachometer, and a variable frequency motor.

[0011] In some embodiments, a temperature sensor, a pressure transmitter, and a humidity sensor are arranged between the intake port of the oil-free air compressor and the three-way valve. A pressure gauge is provided on the second pressure reducing valve. A branch pipeline is arranged between the second pressure reducing valve and the oil-water separator. The branch pipeline is connected in series with a first pressure reducing valve and the end of the pipeline communicates with the atmosphere. A pressure gauge is provided on the first pressure reducing valve, and the working pressure of the first pressure reducing valve is higher than that of the second pressure reducing valve. A manual stop valve is connected in series to the lower end of the oil-water separator, and a pressure gauge is arranged between the oil-water separator and the second filter.

[0012] In some embodiments, the cylinder head of the oil-free air compressor is provided with two pressure transmitters, one of the pressure transmitters is connected to the compression chamber, the other pressure transmitter is connected to the exhaust chamber, and the casing of the oil-free air compressor is provided with a pressure transmitter which is connected to the inner cavity of the casing.

[0013] In some embodiments, a pressure gauge, a digital display pressure gauge, a digital display thermometer, a temperature sensor, and a pressure transmitter are provided between the first filter and the first three-way joint; a safety valve is provided at the top of the first air receiver, a pressure gauge and a pressure transmitter are provided at the upper part; a safety valve is provided at the top of the second air receiver, a pressure gauge is provided at the upper part, and a temperature sensor and a pressure transmitter are provided in the middle; each of the first nozzle system, the second nozzle system, the third nozzle system, and the fourth nozzle system is provided with its own temperature sensor; a pressure transmitter is provided between the pressure controller and the unloading port.

[0014] In some embodiments, the data acquisition module includes a temperature acquisition module, a pressure acquisition module, a flow rate detection module, a torque and speed meter, a humidity acquisition module, and a frequency converter; the temperature acquisition module is a temperature sensor; the pressure acquisition module includes a pressure transmitter, a pressure controller, and a pressure gauge; the flow rate detection module includes the first nozzle system, the second nozzle system, the third nozzle system, the fourth nozzle system, an automatic regulating valve, and a manual regulating valve, and the first nozzle system, the second nozzle system, the third nozzle system, and the fourth nozzle system are provided with ASME nozzles and throttling flow sensors; the torque and speed meter measures the torque and speed of the crankshaft of the oil-free air compressor in real time; the humidity acquisition module is a humidity sensor; and the frequency converter controls the speed of the frequency conversion motor.

[0015] In some embodiments, the control system further includes a self-diagnosis module, a safety alarm module, an expert system module, and a communication module. The self-diagnosis module, the safety alarm module, and the expert system module are all connected to the control processing module. The data storage module is used for real-time storage of the data collected by the data acquisition module and the data generated by the control processing module. The safety alarm module is used for monitoring the maximum working pressures of the first air receiver and the second air receiver, the alarm information of the frequency converter, etc. The self-diagnosis module is used for diagnosing faults of the frequency converter, power supply, oil-free air compressor, sensors, etc. The expert system module is used for thermal calculation and state evaluation of shaft power, indicator diagram, exhaust temperature, etc. The data of the safety alarm module, the self-diagnosis module, and the expert system module are stored in the data storage module and transmitted to the control processing module at the same time. The communication module is used for receiving and transmitting signals.

[0016] In some embodiments, the control processing module is used for controlling the operation of each module in the system, receiving and processing signals, and converting the signals into detection data.

[0017] In a second aspect, the present invention further provides a method for detecting the performance of a medical air compressor. Using the said device, the detection process includes the following steps:

[0018] S1. The rotational speed of the oil-free air compressor is 500 r / min. During the process of detecting that the pressure of the first air storage cylinder rises from 0 Mpa to 800 Mpa, check whether there is any abnormal noise in the oil-free air compressor.

[0019] S2. The oil-free air compressor runs idly at 50% of its rated rotational speed, and detect the abnormal noise and bearing temperature of the oil-free air compressor.

[0020] S3. Adjust the oil-free air compressor to operate at the set working rotational speed until it reaches the target exhaust pressure.

[0021] S4. Judge whether the time for the pressure of the double air storage cylinders of the oil-free air compressor to rise from 100 MPa to the specified value at the rated rotational speed is less than the test requirement value.

[0022] S5. After the air storage cylinder of the oil-free air compressor reaches the specified pressure at the rated rotational speed, stop supplying air, and monitor whether the pressure drop within the specified time meets the specified value.

[0023] S6. Judge whether the upper and lower limit actions of the pressure of the unloading device of the oil-free air compressor are flexible and reliable.

[0024] S7. Based on the nozzle throttling principle, select a nozzle to keep the pressure difference at 204 - 1223.7 mm water column, draw the exhaust volume - rotational speed characteristic curve at different exhaust pressures, and judge whether the curve meets the standard.

[0025] S8. Measure the average torque and angular velocity through a torque rotational speed meter and calculate the shaft power in real time, so as to draw the shaft power - rotational speed characteristic curve at different exhaust pressures and unloading states, and judge whether the curve meets the standard.

[0026] Furthermore, the beneficial effects of the present application are as follows:

[0027] By integrating a complete method for detecting the performance of a medical oil-free air compressor, the present invention designs a device for detecting the performance of a medical oil-free air compressor. The said device for detecting the performance of a medical oil-free air compressor includes an operation table, a gas testing system and a control system, and can work in two modes: manual and automatic according to the detection requirements. It can perform performance tests such as relative productivity, airtightness, pressure relief, exhaust volume, shaft power, indicator diagram, etc. on medical oil-free air compressors of different models. The test data is accurate and reliable, and the wireless transmission of test data can be realized. It has the characteristics of complete test items, high degree of automation and wide test range. Description of the Drawings

[0028] Figure 1 It is a schematic diagram of the overall device for detecting the performance of a medical air compressor provided by the present invention;

[0029] Figure 2 Schematic diagram of the cooperation between the gas test system and the control system in the medical air compressor performance detection device provided by the present invention.

[0030] In the figure: 1 - oil-free air compressor, 2 - digital tachometer, 3 - torque tachometer, 4 - coupling, 5 - variable-frequency motor, 6 - first filter, 7 - pressure gauge, 8 - digital pressure gauge, 9 - digital thermometer, 10 - temperature sensor, 11 - pressure transmitter, 12 - manual stop valve, 13 - first air storage tank, 14 - first three-way joint, 15 - first solenoid valve, 16 - manual stop valve, 17 - second air storage tank, 18 - second three-way joint, 19 - check valve, 20 - safety valve, 21 - third three-way joint, 22 - automatic regulating valve, 23 - fourth three-way joint, 24 - manual regulating valve, 25 - second solenoid valve, 26 - pressure controller, 27 - first pressure reducing valve, 28 - second pressure reducing valve, 29 - manual stop valve, 30 - second filter, 31 - oil-water separator, 32 - third solenoid valve, 33 - exhaust muffler, 34 - fifth three-way joint, 35 - sixth three-way joint, 36 - fourth solenoid valve, 37 - first nozzle system, 38 - fifth solenoid valve, 39 - seventh three-way joint, 40 - second nozzle system, 41 - sixth solenoid valve, 42 - eighth three-way joint, 43 - third nozzle system, 44 - seventh solenoid valve, 45 - fourth nozzle system, 46 - eighth solenoid valve, 47 - ninth solenoid valve, 48 - ninth three-way joint, 49 - tenth three-way joint, 50 - tenth solenoid valve, 51 - eleventh solenoid valve, 52 - eleventh three-way joint, 53 - air compressor performance detection device, 54 - humidity acquisition module, 55 - frequency converter, 56 - data acquisition module, 57 - flow rate detection module, 58 - pressure acquisition module, 59 - temperature acquisition module, 60 - self-diagnosis module, 61 - safety alarm module, 62 - expert system module, 63 - data storage module, 64 - terminal device, 65 - communication module, 66 - display module, 67 - printing module, 68 - test switch, 69 - wireless transmission module, 70 - control processing module, 71 - three-way valve, 72 - humidity sensor. Specific embodiments

[0031] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention. Among them, in the description of the embodiments of the present application, unless otherwise specified, " / " means "or". For example, A / B may mean A or B; "and / or" in the text is only a description of the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B may mean: A exists alone, A and B exist simultaneously, and B exists alone. In addition, in the description of the embodiments of the present application, "a plurality of" means two or more than two. Hereinafter, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the embodiments of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more than two.

[0032] In a first aspect, please refer to Figure 1 - Figure 2 , the present invention provides a performance detection device for a medical air compressor, including: an operation table, a gas test system, and a control system;

[0033] An oil-free air compressor 1 to be tested is set on the operating table; the control system is connected to the gas testing system, including a data acquisition module 56, a data storage module 63, a communication module 65, a control processing module 70, a display module 66, a printing module 67 and a wireless transmission module 69; the gas testing system includes an oil-free air compressor 1, a first air storage cylinder 13, a second air storage cylinder 17, a first nozzle system 37, a second nozzle system 40, a third nozzle system 43, a fourth nozzle system 45; the front shaft end of the crankshaft of the oil-free air compressor 1 is sequentially connected to a coupling 4 and a variable-frequency motor 5; the air inlet end of the oil-free air compressor 1 is sequentially connected to a three-way valve 71, a second pressure reducing valve 28, an oil-water separator 31 and a second filter 30 through pipelines; the exhaust end of the oil-free air compressor 1 is divided into two paths by a first three-way valve 14 after passing through a first filter 6, one of which is connected to the bottom of the first air storage cylinder 13; the other is connected to the bottom of the second air storage cylinder 17 through a first solenoid valve 15; the pipeline connecting the upper parts of the first air storage cylinder 13 and the second air storage cylinder 17 is sequentially connected in series with a second solenoid valve 25 and a one-way valve 19 leading to the direction of the first air storage cylinder 13; a manual stop valve 12 is connected to the bottommost pipeline of the first air storage cylinder 13; a manual stop valve 16 is connected to the bottommost pipeline of the second air storage cylinder 17; a second three-way valve 18 is connected between the second solenoid valve 25 and the one-way valve 19, and is combined into one path through the second three-way valve 18 and connected to a third three-way valve 21, and then after passing through a parallel manual regulating valve 24 and an automatic regulating valve 22, it is combined into one path through a fourth three-way valve 23 and then sequentially passes through a fifth three-way valve 34, a sixth three-way valve 35, a seventh three-way valve 39, an eighth three-way valve 42, an eighth three-way valve 42 and is connected to the rear parts of an exhaust muffler 33, a first nozzle system 37, a second nozzle system 40, a third nozzle system 43, a fourth nozzle system 45, and a third solenoid valve 32, a fourth solenoid valve 36, a fifth solenoid valve 38, a sixth solenoid valve 41, a seventh solenoid valve 44 are sequentially arranged between the fifth three-way valve 34, the sixth three-way valve 35, the seventh three-way valve 39, the eighth three-way valve 42, the eighth three-way valve 42 and the exhaust muffler 33, the first nozzle system 37, the second nozzle system 40, the third nozzle system 43, the fourth nozzle system 45 respectively; pipelines are connected to the side rear parts of the first nozzle system 37, the second nozzle system 40, the third nozzle system 43, the fourth nozzle system 45, and the pipelines are sequentially connected in series with an eleventh solenoid valve 51, a tenth solenoid valve 50, a ninth solenoid valve 47, an eighth solenoid valve 46 and are sequentially connected to an eleventh three-way valve 52, a tenth three-way valve 49, a ninth three-way valve 48, a ninth three-way valve 48 respectively, and are combined into one path and connected to a pressure transmitter 11; the unloading port of the oil-free air compressor 1 is connected to the lower part of the first air storage cylinder 13 through a pipeline in series with a pressure controller 26;

[0034] In a possible implementation manner, a digital display tachometer 2 and a torque tachometer 3 are sequentially connected between the front shaft end of the crankshaft of the oil-free air compressor 1 and the coupling 4.

[0035] In a possible implementation, a temperature sensor 10, a pressure transmitter 11, and a humidity sensor 72 are provided between the air inlet of the oil-free air compressor 1 and the three-way valve 71; a pressure gauge 7 is provided on the second pressure reducing valve 28; a branch pipeline is provided between the second pressure reducing valve 28 and the oil-water separator 31, and a first pressure reducing valve 27 is connected in series in the branch pipeline and the pipeline terminal is open to the atmosphere; a pressure gauge 7 is provided on the first pressure reducing valve 27, and the working pressure of the first pressure reducing valve 27 is higher than that of the second pressure reducing valve 28; a manual stop valve 29 is connected in series at the lower end of the oil-water separator 31, and a pressure gauge 7 is provided between the oil-water separator 31 and the second filter 30.

[0036] In a possible implementation, two pressure transmitters 11 are provided on the cylinder head of the oil-free air compressor 1, one of the pressure transmitters 11 is connected to the compression chamber, the other pressure transmitter 11 is connected to the exhaust chamber, and a pressure transmitter 11 is provided on the housing of the oil-free air compressor 1 and the pressure transmitter 11 is connected to the inner cavity of the housing. In the above structure, real-time monitoring of the key parts of the compressor body is realized, providing important data for evaluating the working state and sealing performance inside the compressor.

[0037] In a possible implementation, a pressure gauge 7, a digital display pressure gauge 8, a digital display thermometer 9, a temperature sensor 10, and a pressure transmitter 11 are provided between the first filter 6 and the first three-way valve 14; a safety valve 20 is provided at the top of the first air storage tank 13, a pressure gauge 7 and a pressure transmitter 11 are provided at the upper part; a safety valve 20 is provided at the top of the second air storage tank 17, a pressure gauge 7 is provided at the upper part, and a temperature sensor 10 and a pressure transmitter 11 are provided in the middle; each of the first nozzle system 37, the second nozzle system 40, the third nozzle system 43, and the fourth nozzle system 45 is provided with its own temperature sensor 10. Pressure gauges, digital display meters, pressure transmitters, temperature sensors, and safety valves are widely provided at the key nodes of the gas flow path. Real-time monitoring and display of the system pressure and temperature are realized, ensuring the safety of the test process and providing necessary parameters for flow calculation.

[0038] In a possible implementation, a pressure transmitter 11 is provided between the pressure controller 26 and the unloading port, which can accurately monitor the pressure of the unloading pipeline and provide data support for analyzing the working state and performance of the unloading device.

[0039] In a possible implementation, the data acquisition module 56 includes a temperature acquisition module 59, a pressure acquisition module 58, a flow rate detection module 57, a torque and speed meter 3, a humidity acquisition module 54, and a frequency converter 55; the temperature acquisition module 59 is set as a temperature sensor 10; the pressure acquisition module 58 is set as a pressure transmitter 11, a pressure controller 26, and a pressure gauge 7; the flow rate detection module 57 is set as a first nozzle system 37, a second nozzle system 40, a third nozzle system 43, a fourth nozzle system 45, an automatic regulating valve 22, and a manual regulating valve 24; the first nozzle system 37, the second nozzle system 40, the third nozzle system 43, and the fourth nozzle system 45 are provided with ASME nozzles and throttling flow sensors; the torque and speed meter 3 measures the torque and speed of the crankshaft of the oil-free air compressor 1 in real time; the humidity acquisition module 54 is set as a humidity sensor 72; the frequency converter 55 controls the speed of the frequency conversion motor 5. In the above structure, the present application integrates the acquisition capabilities of key parameters such as temperature, pressure, flow rate, rotational speed torque, humidity, and motor control, providing comprehensive raw data input for the control system.

[0040] In a possible implementation, the data storage module 63 is used for real-time storage of the data collected by the data acquisition module 56 and the data generated by the control and processing module 70; the safety alarm module 61 is used for monitoring the maximum working pressures of the first air storage cylinder 13 and the second air storage cylinder 17, the alarm information of the frequency converter 55, etc.; the self-diagnosis module 60 is used for diagnosing faults of the frequency converter 55, power supply, oil-free air compressor 1, sensors, etc.; the expert system module 62 is used for thermal calculations and state evaluations such as shaft power, indicator diagram, and exhaust temperature. The data of the safety alarm module 61, the self-diagnosis module 60, and the expert system module 62 are stored in the data storage module 63 and simultaneously transmitted to the control and processing module 70, realizing real-time storage, historical traceability, and centralized management of test data, and the data of all modules are interconnected, supporting control decision-making and result display.

[0041] In a possible implementation, the communication module 65 is used for receiving and transmitting signals, and the control and processing module 70 is used for controlling the operation of each module in the system, receiving and processing signals, and converting the signals into detection data.

[0042] In a possible implementation, the display module 66 is set as a touch display screen, and the touch display screen is connected to the control and processing module 70, used for inputting and modifying parameter settings, real-time displaying test status, test data, alarm information, and fault expert system information, and providing an intuitive and highly interactive user operation interface. The present invention adopts full-process automatic detection, greatly improving the operation efficiency.

[0043] In a possible implementation, the printing module 67 is set as a printer, used for outputting and printing test data, providing the ability to output a physical copy of the test report, facilitating recording, archiving, and auditing.

[0044] In a possible implementation manner, the wireless transmission module 69 is used to remotely transmit the detection data and calculation and analysis results in the control processing module 70 and the data storage module 63 to the terminal device 64; the remote transmission is one of the GPRS wireless mode, the RS232 serial port mode, and the TCP / IP mode.

[0045] In a possible implementation manner, the test switch 68 is used to detect the start and stop of the device test.

[0046] In a possible implementation manner, the oil-free air compressor performance detection device can work in two modes: manual and automatic. In the manual mode, operate the test switch 68 or touch the display screen button to start the oil-free air compressor performance detection device; in the automatic mode, according to the set test formula, run the oil-free air compressor performance detection device to complete the required detection items, providing operation flexibility. The manual mode is convenient for single-step operation or debugging; the automatic mode realizes one-key full-automatic testing through the preset "test formula", greatly improving the test efficiency and standardization degree, and reducing human errors.

[0047] In a second aspect, the present invention also provides a method for detecting the performance of a medical air compressor, using the said device, including the following detection processes:

[0048] S1. The rotational speed of the oil-free air compressor is 500 r / min, and it is detected whether there is any abnormal noise in the oil-free air compressor during the process of the pressure in the first air storage cylinder rising from 0 Mpa to 800 Mpa;

[0049] S2. The oil-free air compressor runs idly at 50% of the rated rotational speed, and the abnormal noise and bearing temperature of the oil-free air compressor are detected;

[0050] S3. The oil-free air compressor is adjusted to run at the set working rotational speed to the target exhaust pressure;

[0051] S4. It is judged whether the time for the pressure in the double air storage cylinders of the oil-free air compressor to rise from 100 MPa to the specified value at the rated rotational speed is less than the test requirement value;

[0052] S5. After the air storage cylinder of the oil-free air compressor reaches the specified pressure at the rated rotational speed, the air supply is stopped, and it is monitored whether the pressure drop within the specified time meets the specified value;

[0053] S6. It is judged whether the upper and lower limit actions of the unloading device pressure of the oil-free air compressor are flexible and reliable;

[0054] S7. Based on the nozzle throttling principle, a nozzle is selected to keep the pressure difference at 204 - 1223.7 mm water column, and the exhaust volume - rotational speed characteristic curve at different exhaust pressures is drawn, and it is judged whether the curve meets the standard;

[0055] S8. Measure the average torque and angular velocity through a torque and speed meter, and calculate the shaft power in real time to plot the shaft power - speed characteristic curves under different exhaust pressures and unloading states, and determine whether the curves meet the standards.

[0056] In the above method, it should be noted that the exhaust volume value in the measured exhaust volume - speed characteristic curve should not be less than the exhaust volume value in the standard exhaust volume - speed characteristic curve, and the shaft power in the measured shaft power - speed characteristic curve should not be greater than the shaft power value in the standard shaft power - speed characteristic curve. The specific curvature or curve shape of the two should depend on the model of the oil - free air compressor.

[0057] Next, the above - mentioned detection method will be described in detail in combination with specific embodiments:

[0058] Among them, step S1 is the idle - speed test: When the speed of the oil - free air compressor 1 is set to 500 r / min, set the working pressures of the second pressure reducing valve 28 and the first pressure reducing valve 27 according to the test requirements. The three - way valve 71 is in position A (if the air in the test area is clean, the three - way valve 71 can also be selected to be in position B). The first solenoid valve 15 and the second solenoid valve 25 are de - energized. The pressure of the first air storage tank 13 should have no abnormal noise when rising from 0 Mpa to 800 Mpa, especially no abnormal noise at 600 Mpa. After the test is completed, the automatic regulating valve 22 is opened to the maximum opening, the manual regulating valve 24 is closed, the second solenoid valve 25 and the third solenoid valve 32 are energized, and the fourth solenoid valve 36, the fifth solenoid valve 38, the sixth solenoid valve 41, and the seventh solenoid valve 44 are de - energized to empty the first air storage tank 13. During the test, collect relevant parameters according to the overall schematic diagram of the medical air compressor performance detection device.

[0059] The no - load test: When the speed of the oil - free air compressor 1 is set to 50% of the rated speed, the set working pressures of the second pressure reducing valve 28 and the first pressure reducing valve 27 remain unchanged. The three - way valve 71 is in position A (if the air in the test area is clean, the three - way valve 71 can also be selected to be in position B). The first solenoid valve 15, the fourth solenoid valve 36, the fifth solenoid valve 38, the sixth solenoid valve 41, and the seventh solenoid valve 44 are de - energized, and the second solenoid valve 25 and the third solenoid valve 32 are energized. The automatic regulating valve 22 is opened to the maximum opening, and the manual regulating valve 24 is closed or finely adjusted to stabilize the pressure to the no - load state. Run at no - load for the set time, and during this period, check whether the oil - free air compressor 1 has abnormal noise and whether the bearings are overheated.

[0060] Load test: When the rotation speed of the oil-free air compressor 1 is set to the set working speed, the working pressures set by the second pressure reducing valve 28 and the first pressure reducing valve 27 remain unchanged. The three-way valve 71 is in position A (if the air in the test area is clean, the three-way valve 71 can also be selected to be in position B). The first solenoid valve 15, the fourth solenoid valve 36, the fifth solenoid valve 38, the sixth solenoid valve 41, and the seventh solenoid valve 44 are de-energized, and the second solenoid valve 25 and the third solenoid valve 32 are energized. Adjust the opening of the automatic regulating valve 22, close the manual regulating valve 24 or finely adjust the pressure to the set exhaust pressure state, and operate at the set exhaust pressure for the set time.

[0061] Relative productivity test: When the rotation speed of the oil-free air compressor 1 is set to the rated speed, the working pressures set by the second pressure reducing valve 28 and the first pressure reducing valve 27 remain unchanged. The three-way valve 71 is in position A (if the air in the test area is clean, the three-way valve 71 can also be selected to be in position B). The second solenoid valve 25, the third solenoid valve 32, the fourth solenoid valve 36, the fifth solenoid valve 38, the sixth solenoid valve 41, and the seventh solenoid valve 44 are de-energized, and the first solenoid valve 15 is energized. The automatic regulating valve 22 and the manual regulating valve 24 are closed. When the pressures of the first air storage tank 13 and the second air storage tank 17 rise from 100 Mpa to the specified value, the required time shall not be greater than the test requirement value.

[0062] Sealing test: When the rotation speed of the oil-free air compressor 1 is set to the rated speed, the first solenoid valve 15 and the second solenoid valve 25 are de-energized. When the pressure of the first air storage tank 13 rises to the specified value, the oil-free air compressor 1 stops supplying air. After the pressure of the first air storage tank 13 stabilizes to the specified value and after the specified time (generally 1 - 5 minutes), if the pressure drop value of the air storage tank is not greater than the specified value, it is qualified.

[0063] Pressure release test: The oil-free air compressor 1 supplies air to the first air storage tank 13 (the three-way valve 71 is in position A or B, and the first solenoid valve 15 and the second solenoid valve 25 are de-energized). When the pressure in the first air storage tank 13 rises to the upper limit value controlled by the pressure controller 26 (the pressure upper limit value varies according to the type of the oil-free air compressor 1), the unloading device starts to work, and the oil-free air compressor 1 starts to unload and operate and no longer supplies air to the first air storage tank 13, and the pressure of the first air storage tank 13 no longer rises. At this time, the second solenoid valve 25 and the third solenoid valve 32 are energized, the manual regulating valve 24 is closed, and the automatic regulating valve 22 is opened and the opening is adjusted to make the pressure in the first air storage tank 13 drop and gradually reach the lower limit value controlled by the pressure controller 26 (the pressure lower limit value varies according to the type of the oil-free air compressor 1). At this time, the oil-free air compressor 1 is in the air supply state again, and the air pressure rises again until the unloading device works. Repeat the above process three times or more, and the unloading device of the oil-free air compressor 1 is qualified (the oil-free air compressor 1 without an unloading device does not perform this test).

[0064] Exhaust volume test: When the oil-free air compressor 1 is set to the set operating speed, the working pressures set by the second pressure reducing valve 28 and the first pressure reducing valve 27 remain unchanged. The three-way valve 71 is in position A (if the air in the test area is clean, the three-way valve 71 can also be selected to be in position B). The first solenoid valve 15, the second solenoid valve 25, the seventh solenoid valve 44, and the eighth solenoid valve 46 are energized. The third solenoid valve 32, the fourth solenoid valve 36, the fifth solenoid valve 38, the sixth solenoid valve 41, the ninth solenoid valve 47, the tenth solenoid valve 50, and the eleventh solenoid valve 51 are de-energized. Adjust the opening of the automatic regulating valve 22, close the manual regulating valve 24 or finely adjust the voltage to the set exhaust pressure state. If the pressure difference H before and after the nozzle measured by the fourth nozzle system 45 is less than 153 mm (water column), then the seventh solenoid valve 44 and the eighth solenoid valve 46 are de-energized, and the sixth solenoid valve 41 and the ninth solenoid valve 47 are energized. And so on, automatically select the third nozzle system 43, the second nozzle system 40, and the first nozzle system 37 with appropriate passages until 1223.7 mm (water column) > the pressure difference H before and after the selected nozzle ≥ 204 mm (water column). Then run stably for 1 min, collect all parameters and calculate, and automatically draw the exhaust volume - speed characteristic curve at different exhaust pressures.

[0065] The gas test system uses a nozzle throttling measurement device. The exhaust volume of the oil-free air compressor 1 being tested is measured at the set operating speed and exhaust pressure, and is calculated with consideration of the discharged cooling water and speed correction. The specific formula applied is:

[0066]

[0067]

[0068] In the formula:

[0069] d — nozzle diameter (m); c — nozzle coefficient; T0 — absolute temperature of the inhaled air (K);

[0070] T1 — absolute temperature of the air before the nozzle (K); p0 — absolute pressure of the inhaled air H — pressure difference before and after the nozzle expressed in millimeters of water column height (mm);

[0071] Q0 — exhaust volume of the air compressor before correction (m 3 / min);

[0072] Q1 — exhaust volume of the air compressor after considering the condensate water (m 3 / min);

[0073] W S — mass of condensate water collected per unit time between the air intake of the air compressor and the nozzle (k / min);

[0074] ρ S—Density of saturated water vapor at the intake air temperature (kg / m 3 );

[0075] p S —Saturated water vapor pressure at the intake air temperature (kg / cm 2 );

[0076] [Q]—Exhaust volume of the air compressor under specified operating conditions (m 3 / min);

[0077] [n]—Rated speed of the air compressor (r / min); n—Actual speed of the air compressor (r / min).

[0078] Shaft power test: When the oil-free air compressor 1 is set to the specified operating speed and exhaust pressure (including the unloaded state), while testing the exhaust volume and the pressure release test, relevant parameters are collected and calculated to achieve the shaft power test, and the shaft power-speed characteristic curves under different exhaust pressures and unloaded states are automatically plotted. The shaft power is obtained by measuring the average torque and the actual angular velocity with a torque speed meter, and its calculation formula is:

[0079]

[0080] In the formula:

[0081] N k —Shaft power of the air compressor (KW);

[0082] M k —Torque of the air compressor shaft (N.m);

[0083] n—Actual speed of the air compressor shaft (r / min);

[0084] w—Angular velocity of the air compressor shaft (rad / s).

[0085] Indicator diagram test: The indicator diagram measured by the gas test system is a curve formed by the change of the gas pressure in the cylinder of the oil-free air compressor 1 with the crankshaft angle of the oil-free air compressor 1.

[0086] There are the following two situations, specifically: When the set operating speed of the oil-free air compressor 1 remains unchanged and the exhaust pressure is changed, the indicator diagrams under different exhaust pressure states are tested.

[0087] The oil-free air compressor 1 is set to the set operating speed, the three-way valve 71 is in position A (if the air in the test area is clean, the three-way valve 71 can also be selected to be in position B), the first solenoid valve 15, the fourth solenoid valve 36, the fifth solenoid valve 38, the sixth solenoid valve 41, and the seventh solenoid valve 44 are de-energized, the second solenoid valve 25 and the third solenoid valve 32 are energized, the opening of the automatic regulating valve 22 is adjusted, the manual regulating valve 24 is closed or finely adjusted to stabilize the pressure to the set exhaust pressure state, and the indicator diagram is obtained by operating at different set exhaust pressures for a set time.

[0088] When the set exhaust pressure of the oil-free air compressor 1 remains unchanged, the operating speed is changed, and the indicator diagrams in different operating speed states are tested.

[0089] The oil-free air compressor 1 is set to the set exhaust pressure, the three-way valve 71 is in position A (if the air in the test area is clean, the three-way valve 71 can also be selected to be in position B), the first solenoid valve 15, the fourth solenoid valve 36, the fifth solenoid valve 38, the sixth solenoid valve 41, and the seventh solenoid valve 44 are de-energized, the second solenoid valve 25 and the third solenoid valve 32 are energized, the opening of the automatic regulating valve 22 is adjusted, the manual regulating valve 24 is closed or finely adjusted to stabilize the pressure to the set exhaust pressure state, and the indicator diagram is obtained by operating at different set operating speeds for a set time.

[0090] In the present invention, unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; for those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0091] Obviously, those skilled in the art can make various changes and modifications to this application without departing from the spirit and scope of this application. Thus, if these modifications and variations of this application fall within the scope of the claims of this application and their equivalent technologies, this application also intends to include these changes and modifications.

Claims

1. A performance detection device for a medical air compressor, characterized in that, Including: An operating platform, a gas testing system and a control system; The operating platform is used to set the oil-free air compressor to be tested. The control system includes a data acquisition module, a data storage module and a control processing module, and is used to regulate the operating state of the gas detection system; The gas testing system includes at least two air storage cylinders, multiple nozzle systems, multiple three-way joints, multiple solenoid valves and regulating valves. The intake end of the oil-free air compressor is sequentially connected to a three-way valve, a pressure reducing valve, an oil-water separator and a filter. The exhaust end of the oil-free air compressor is divided into two branches through the first filter by the first three-way joint. The first branch is connected to the bottom of the first air storage cylinder, and the second branch is connected to the bottom of the second air storage cylinder through the first solenoid valve. The upper parts of the first air storage cylinder and the second air storage cylinder are connected in series with the second solenoid valve and a check valve through a pipeline, and manual stop valves are connected to the bottoms of the first air storage cylinder and the second air storage cylinder. A second three-way joint is connected between the second solenoid valve and the check valve, and a manual regulating valve and an automatic regulating valve are connected in parallel through the second three-way joint and the third three-way joint. The third three-way joint is combined into one path through the fourth three-way joint and is sequentially connected to multiple three-way joints to connect multiple nozzle systems and an exhaust muffler. Among them, a pipeline is connected to the rear side of each nozzle system, and each pipeline is serially connected with a solenoid valve and a three-way joint. The ends of multiple three-way joints are combined into one path through a three-way joint and connected to a pressure transmitter. The unloading port of the oil-free air compressor is connected to the lower part of the first air storage cylinder through a pressure controller.

2. The medical air compressor performance detection device according to claim 1, wherein, The multiple nozzle systems include four nozzle systems. After being combined into one path, the fourth three-way joint is sequentially connected to the exhaust muffler, the first nozzle system, the second nozzle system, the third nozzle system and the rear part of the fourth nozzle system through the fifth three-way joint, the sixth three-way joint, the seventh three-way joint, the eighth three-way joint and the eighth three-way joint. And third solenoid valves, fourth solenoid valves, fifth solenoid valves, sixth solenoid valves and seventh solenoid valves are arranged between the three-way joints passed through and the exhaust muffler, the first nozzle system, the second nozzle system, the third nozzle system and the fourth nozzle system; Pipelines are connected to the rear sides of the first nozzle system, the second nozzle system, the third nozzle system and the fourth nozzle system. The pipelines are serially connected with the eleventh solenoid valve, the tenth solenoid valve, the ninth solenoid valve and the eighth solenoid valve and are sequentially connected to the eleventh three-way joint, the tenth three-way joint, the ninth three-way joint and the ninth three-way joint respectively.

3. The medical air compressor performance detection device according to claim 1, characterized in that The front shaft end of the crankshaft of the oil-free air compressor is sequentially connected to a digital display tachometer, a torque tachometer and a variable frequency motor.

4. The medical air compressor performance detection device according to claim 1, characterized in that, A temperature sensor, a pressure transmitter and a humidity sensor are arranged between the intake port of the oil-free air compressor and the three-way valve; A pressure gauge is arranged on the second pressure reducing valve; A branch pipeline is arranged between the second pressure reducing valve and the oil-water separator. The branch pipeline is serially connected with a first pressure reducing valve and the end of the pipeline leads to the atmosphere; A pressure gauge is arranged on the first pressure reducing valve, and the working pressure of the first pressure reducing valve is higher than that of the second pressure reducing valve; A manual stop valve is serially connected to the lower end of the oil-water separator, and a pressure gauge is arranged between the oil-water separator and the second filter.

5. The medical air compressor performance detection device according to claim 1, wherein, The cylinder head of the oil-free air compressor is provided with two pressure transmitters. One of the pressure transmitters is connected to the compression chamber, and the other pressure transmitter is connected to the exhaust chamber. Moreover, the box body of the oil-free air compressor is provided with a pressure transmitter which is connected to the inner cavity of the box body.

6. The medical air compressor performance detection device according to claim 2, wherein, A pressure gauge, a digital display pressure gauge, a digital display thermometer, a temperature sensor, and a pressure transmitter are arranged between the first filter and the first three-way joint. A safety valve is arranged at the top of the first air storage cylinder, and a pressure gauge and a pressure transmitter are arranged at the upper part. A safety valve is arranged at the top of the second air storage cylinder, a pressure gauge is arranged at the upper part, and a temperature sensor and a pressure transmitter are arranged in the middle. Each of the first nozzle system, the second nozzle system, the third nozzle system, and the fourth nozzle system is provided with its own temperature sensor. A pressure transmitter is arranged between the pressure controller and the unloading port.

7. The medical air compressor performance detection device according to claim 1, wherein, The data acquisition module includes a temperature acquisition module, a pressure acquisition module, a flow detection module, a torque and speed meter, a humidity acquisition module, and a frequency converter. The temperature acquisition module is set as a temperature sensor. The pressure acquisition module includes a pressure transmitter, a pressure controller, and a pressure gauge. The flow detection module includes the first nozzle system, the second nozzle system, the third nozzle system, the fourth nozzle system, an automatic regulating valve, and a manual regulating valve. Moreover, the first nozzle system, the second nozzle system, the third nozzle system, and the fourth nozzle system are provided with ASME nozzles and throttling flow sensors. The torque and speed meter measures the torque and speed of the crankshaft of the oil-free air compressor in real time. The humidity acquisition module is set as a humidity sensor. The frequency converter controls the speed of the frequency conversion motor.

8. The medical air compressor performance detection device according to claim 1, wherein The control system further includes a self-diagnosis module, a safety alarm module, an expert system module, and a communication module. Among them, the self-diagnosis module, the safety alarm module, and the expert system module are all connected to the control processing module. The data storage module is used for real-time storage of the data collected by the data acquisition module and the data generated by the control processing module. The safety alarm module is used for monitoring the maximum working pressure of the first air storage cylinder and the second air storage cylinder, the alarm information of the frequency converter, etc. The self-diagnosis module is used for diagnosing faults of the frequency converter, power supply, oil-free air compressor, sensor, etc. The expert system module is used for thermal calculation and state evaluation of shaft power, indicator diagram, exhaust temperature, etc. The data of the safety alarm module, the self-diagnosis module, and the expert system module are stored in the data storage module and simultaneously transmitted to the control processing module. The communication module is used for receiving and transmitting signals.

9. The medical air compressor performance detection device according to claim 1, characterized in that, The control processing module is used for controlling the operation of each module in the system, receiving and processing signals, and converting the signals into detection data.

10. A method for detecting the performance of a medical air compressor, using the device according to any one of claims 1-9, characterized in that, It includes the following detection processes: S1. When the rotational speed of the oil-free air compressor is 500 r / min, detect whether there is any abnormal noise in the oil-free air compressor during the process that the pressure of the first air storage cylinder rises from 0 Mpa to 800 Mpa. S2. The oil-free air compressor runs idly at 50% of the rated speed, and detect the abnormal noise and bearing temperature of the oil-free air compressor. S3. Adjust the oil-free air compressor to run at the set working speed to the target exhaust pressure. S4. Determine whether the time for the pressure in the double air receivers to rise from 100 MPa to the specified value at the rated speed of the oil-free air compressor is less than the test requirement value; S5. After the air receiver reaches the specified pressure at the rated speed of the oil-free air compressor, stop the air supply and monitor whether the pressure drop within the specified time meets the specified value; S6. Determine whether the upper and lower limit actions of the unloading device of the oil-free air compressor are flexible and reliable; S7. Based on the nozzle throttling principle, select a nozzle to maintain the pressure difference at 204 - 1223.7 mm water column, draw the exhaust volume - speed characteristic curve at different exhaust pressures, and determine whether the curve meets the standard; S8. Measure the average torque and angular velocity through a torque speed meter and calculate the shaft power in real time to draw the shaft power - speed characteristic curve at different exhaust pressures and unloading states, and determine whether the curve meets the standard.

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