Medical turbofan performance experiment table and test method thereof

Abstract

The invention discloses a medical turbofan performance experiment table. The medical turbofan performance experiment table comprises a sensor and a pipeline system, the sensor and pipeline system comprises a performance path used for a turbofan performance test, a service life path used for a turbofan service life test and a noise tester used for collecting turbofan operation noise. The performance circuit comprises an air inlet, an inlet temperature sensor, an inlet pressure sensor, a differential pressure sensor, an outlet temperature sensor, a flow sensor, a first flow regulating valve and an exhaust port which are arranged in sequence; the service life path comprises an air inlet, a second flow adjusting valve and an exhaust port which are sequentially arranged. The invention further discloses a medical turbofan performance experiment method which comprises a turbofan performance test and a service life test. According to the platform, automatic flow, pressure, power and other parameters are collected automatically, meanwhile, automatic acceleration and deceleration control of the turbofan can be achieved, meanwhile, a noise testing system and a simulated installation environment are integrated, and accurate and automatic testing of the performance of the medical turbofan can be achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of turbine blowers for medical ventilators, and in particular relates to a medical turbine blower performance test bench and a test method thereof. Background Art

[0002] As a key pneumatic component of medical ventilators, the performance of the turbine blower plays a vital role in the entire ventilator.

[0003] The turbine in the ventilator needs to communicate with the whole machine and match the algorithm, so there are very strict design requirements for the shape of the turbine performance curve (no hump), combined with the frequent speed and flow rate changes of the ventilator, as well as the restrictions on noise. This makes the design of medical micro-turbines very different from that of conventional turbine blowers.

[0004] Therefore, a very professional experimental test platform is required in the single-machine development process of medical micro-turbine blowers to test the actual working performance and transient characteristics of the turbine blowers, and to iterate and optimize the design of the turbine blowers based on the test results, while providing guarantees for subsequent factory tests.

[0005] Currently, there is no mature comprehensive performance testing platform specifically for micro-turbine fans to perform performance testing and transient response testing (10ms). Summary of the invention

[0006] The purpose of the present invention is to overcome the above defects and provide a medical turbo blower performance test bench and its testing method, which solves the technical problem that the existing single experimental platform cannot simultaneously monitor and test durability, acceleration and deceleration, performance and noise. The platform of the present invention adopts the automatic acquisition of parameters such as flow, pressure, power, etc., and can realize the automatic acceleration and deceleration control of the turbo blower. At the same time, it integrates the noise test system and simulates the installation environment, and can realize the accurate and automatic testing of the performance of the medical turbo blower.

[0007] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0008] A medical turbo blower performance test bench, comprising: a sensor and a pipeline system;

[0009] The sensor and pipeline system includes a performance circuit for a turbine fan performance test, a life circuit for a turbine fan life test, and a noise tester for collecting turbine fan operation noise;

[0010] The performance path includes an air inlet, an inlet temperature sensor, an inlet pressure sensor, a pressure difference sensor, an outlet temperature sensor, a flow sensor, a first flow regulating valve and an exhaust port which are arranged in sequence; the inlet temperature sensor, the inlet pressure sensor, the pressure difference sensor, the outlet temperature sensor and the flow sensor are used to obtain the inlet temperature, the inlet pressure, the inlet and outlet pressure difference, the outlet temperature and the outlet flow of the turbo blower to be tested respectively; the first flow regulating valve is used to adjust the gas flow in the performance path;

[0011] The life path includes an air inlet, a second flow regulating valve and an exhaust port which are arranged in sequence; the second flow regulating valve is used to adjust the gas flow in the life path.

[0012] Furthermore, the number of performance paths is greater than or equal to 3, the number of life paths is greater than or equal to 2, and the performance paths and life paths are arranged in parallel to perform performance tests or life tests on multiple turbine blowers at the same time.

[0013] Furthermore, the two interface pipes of the differential pressure sensor are respectively connected to the turbine inlet pipe and the turbine outlet pipe through two sealing joints; the turbine inlet pipe is the pipe between the air inlet and the turbine fan inlet, and the turbine outlet pipe is the pipe between the turbine fan outlet and the exhaust port.

[0014] Furthermore, the sealing joint is a double sealing joint;

[0015] The double seal joint includes a jacket nut, a threaded joint, a front ferrule and a back ferrule;

[0016] The threaded joint is welded on the turbine inlet pipeline or the turbine outlet pipeline, the outer sleeve nut is sleeved on the outside of the interface pipeline of the differential pressure sensor, and the front ferrule and the rear ferrule are sleeved on the outside of the interface pipeline of the differential pressure sensor and are located between the outer sleeve nut and the threaded joint;

[0017] After the outer sleeve nut and the threaded joint are screwed into place, the front ferrule and the rear ferrule are pressed tightly, and the front ferrule and the rear ferrule are matched through the sealing surface to achieve the sealing between the turbine inlet pipeline or the turbine outlet pipeline and the differential pressure sensor interface pipeline.

[0018] Furthermore, in the axial section, the sealing surface of the front ferrule conforms to the following linear equation:

[0019] y1=a2x1 3 -b2x1 2 +c2x1;

[0020] Among them, (x1, y1) is a point in the coordinate system x1o1y1, with the direction of the threaded joint as the low point and the direction of the outer nut as the high point. The origin of the coordinate system x1o1y1 is the lowest point where the front ferrule contacts the outer surface of the differential pressure sensor interface pipeline, and the x1 axis is parallel to the axial direction of the differential pressure sensor interface pipeline and points to the high direction.

[0021] a2=6~7; b2=2.8~3.3; c2=0.3~0.8.

[0022] Furthermore, in the axial section, the sealing surface of the rear ferrule conforms to the following linear equation:

[0023] y2=a1x2 3 -b1x2 2 +c1x2;

[0024] Among them, (x2, y2) is a point in the coordinate system x2o2y2, with the direction of the threaded joint as the low point and the direction of the outer nut as the high point. The origin of the coordinate system x2o2y2 is the lowest point where the rear ferrule contacts the outer surface of the differential pressure sensor interface pipeline, and the x2 axis is parallel to the axial direction of the differential pressure sensor interface pipeline and points to the high direction;

[0025] a1=14.5~15.5; b1=7~7.5; c1=1.0~1.5.

[0026] Furthermore, it also includes tooling and platform systems, power supply and measurement and control systems, and host computer control systems;

[0027] The power supply and measurement and control system is used to supply power to the tooling and platform system, the host computer control system, and the sensor and pipeline system, and collect the test data of the sensors in the sensor and pipeline system;

[0028] The host computer control system is used to control the opening of the flow regulating valve in the sensor and pipeline system and the working state of the turbine fan;

[0029] The tooling and platform system includes a control cabinet, a silencer, a turbine installation tooling, an experimental cabin, an observation window, and a cooling fan;

[0030] The control cabinet is used to accommodate the power supply, measurement and control system and the experimental cabin; the silencer is used to eliminate the background noise during the test and realize the collection of turbine fan noise; the turbine installation tool is used to fix the turbine fan; the experimental cabin is used to accommodate sensors and piping systems; the observation window is used to observe the status of the turbine fan during the test; the cooling fan is used to dissipate heat from the turbine fan during the test.

[0031] Further, the turbine installation tooling includes a lower bracket and an upper bracket;

[0032] The upper bracket and the lower bracket are both provided with semicircular grooves. The upper bracket and the lower bracket are combined to fix the motor part of the turbine fan. The upper bracket and the lower bracket are fastened by a locking nut.

[0033] A medical turbo blower performance test method, implemented using the above-mentioned medical turbo blower performance test bench, including a turbo blower performance test or a life test;

[0034] The performance test of the turbo fan includes conventional performance test or transient speed change test;

[0035] Conventional performance test methods include:

[0036] S1.1 makes the turbo fan work stably at the target speed;

[0037] S1.2 regulating the gas flow in the performance path through the first flow regulating valve;

[0038] S1.3 Collect the inlet temperature, inlet pressure, inlet and outlet pressure difference, outlet temperature and outlet flow rate of the turbo blower at different gas flow rates;

[0039] S1.4 changes the target speed of the turbo fan and repeats steps S1.1 to S1.3;

[0040] S1.5 Obtain the full performance curve or hump performance of the turbo blower according to the inlet temperature, inlet pressure, inlet and outlet pressure difference, outlet temperature and outlet flow rate of the turbo blower at different gas flow rates collected at different target speeds;

[0041] The methods of transient speed change test include:

[0042] S2.1 makes the turbo fan run at variable speed to simulate the actual working condition;

[0043] S2.2 collects the operating noise, inlet temperature, inlet pressure, inlet and outlet pressure difference, outlet temperature and outlet flow of the turbo fan in real time;

[0044] S2.3 obtains the transient performance of the turbo fan according to the inlet temperature, inlet pressure, inlet and outlet pressure difference, outlet temperature and outlet flow rate of the turbo fan collected in real time;

[0045] The methods for turbine fan life test include:

[0046] The turbo fan is made to run continuously for a predetermined time under constant speed or variable speed conditions, and the operating noise, power, and motor speed data of the turbo fan are collected in real time during the operation. When the monitored operating data exceeds the alarm value, the working life of the turbo fan is obtained and it is automatically shut down.

[0047] Furthermore, in step S1.5, the full performance curve of the turbo blower includes a corresponding relationship curve between the inlet and outlet pressure ratio and the flow rate, a corresponding relationship curve between the power and the flow rate, or a corresponding relationship curve between the efficiency and the flow rate;

[0048] The full performance curve of the turbo fan is obtained by the fitting method. The fitting equation of the full performance curve of the turbo fan is:

[0049] D=a1Q2 +a2Q+a3; where Q represents the outlet flow rate, D represents the fitting value of the inlet and outlet pressure ratio, power or efficiency, and a1, a2, and a3 represent the parameters to be fitted;

[0050] When collecting pressure or differential pressure data, the data with a data fluctuation coefficient less than the preset threshold is regarded as valid data. The data fluctuation coefficient is F c1 and F c2 :

[0051]

[0052] Where N is the total number of data points collected within the predetermined time period, P i is the collected pressure or pressure difference data point, 1≤i≤N.

[0053] Compared with the prior art, the present invention has at least one of the following beneficial effects:

[0054] (1) The present invention can realize efficient and comprehensive testing of the performance of medical turbo blowers by setting performance circuits and life circuits, and at the same time facilitates high-precision automatic control;

[0055] (2) The present invention provides a double sealing joint structure, which can effectively improve the acquisition accuracy of the inlet and outlet pressure difference of the turbo blower and improve the accuracy of the test;

[0056] (3) The present invention sets up a complete set of test benches for the adaptability of medical turbo blowers. By designing the positions and control methods of various components, it has the ability to automatically collect pressure, flow and other sensors and control the turbo blower, and can realize the performance, durability, noise and other tests of the turbo blower;

[0057] (4) The present invention is a test platform specifically for medical turbines. The pipelines and test sensors used meet the requirements of oxygen-rich environment application and biocompatibility, and the operation process will not pollute the inside of the product;

[0058] (5) The present invention adopts an automated collection and control system, which can collect and monitor all data generated by the turbine test bench in real time and perform programmed control on the turbine operation;

[0059] (6) The experimental test platform of the present invention has a special silent noise elimination environment, which can be used for online noise collection and testing of the turbine;

[0060] (7) The experimental test platform of the present invention has ultra-high data acquisition and control accuracy, and can realize the performance experimental research of the medical turbine rapid start-up and speed change process. BRIEF DESCRIPTION OF THE DRAWINGS

[0061] Figure 1Schematic diagram of the overall structure of the wheel fan test bench of the present invention; (a) is a front view, and (b) is a back view;

[0062] Figure 2 The sensor and pipeline system flow chart of the present invention;

[0063] Figure 3 Schematic diagram of the pipeline connection of the test bench of the present invention; (a) is the performance path, (b) is the life path;

[0064] Figure 4 This is a schematic diagram of the installation of the turbo blower of the present invention;

[0065] Figure 5 This is a schematic diagram of a sealing pipe joint of the present invention;

[0066] Figure 6 The figure is a line diagram of the sealing surface of a double sealing joint, wherein (a) is a line diagram of the sealing surface of the rear ferrule, and (b) is a line diagram of the sealing surface of the front ferrule;

[0067] In the figure, 5-turbine fan;

[0068] 1-1 control cabinet, 1-2 silencer, 1-3 turbine installation tool, 1-3-1 upper bracket, 1-3-2 lower bracket, 1-3-3 locking nut, 1-4 test chamber, 1-5 pipeline tool, 1-6 observation window, 1-7 front panel, 1-8 cooling fan;

[0069] 2-1 display screen, 2-2 keyboard, 2-3 PXI chassis, 2-4 programmable power supply, 2-5 acquisition board;

[0070] 3a first performance path, 3b second performance path, 3c third performance path, 3d first life path, 3e second life path, 3-1 noise tester, 3a-2 first filter, 3a-3 inlet temperature sensor, 3a-4 inlet pressure sensor, 3a-6 outlet temperature sensor, 3a-7 flow sensor, 3a-8 first flow regulating valve, 3a-9 differential pressure sensor, 3a-10 first pipeline, 3-10-1 turbine inlet pipeline, 3-10-2 turbine outlet pipeline, 3a-11 double sealing joint, 3a-11-1 outer sleeve nut, 3a-11-2 rear ferrule, 3a-11-2.1 rear ferrule sealing surface, 3a-11-3 front ferrule, 3a-11-3.1 front ferrule sealing surface, 3a-11-4 threaded joint, 3d-2 second filter, 3d-8 second flow regulating valve, 3d-10 second pipeline. DETAILED DESCRIPTION

[0071] The following detailed description of the present invention will make the features and advantages of the present invention more clear and explicit.

[0072] The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration." Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. Although various aspects of the embodiments are shown in the drawings, the drawings are not necessarily drawn to scale unless otherwise noted.

[0073] The present invention provides a modular and automated comprehensive performance test platform specifically for medical turbines, which has the ability to automatically collect pressure, flow and other sensors and control turbine blowers, and can realize the performance, durability, noise and other tests of turbines. The platform has good sealing characteristics and high-precision collection and control rates, and can realize the 10ms-level fast response acceleration and deceleration performance collection and experimental research of medical turbine blowers.

[0074] The turbine fan test system of the present invention comprises a tooling and platform system, a power supply and measurement and control system, a sensor and pipeline system and a host computer software system.

[0075] The tooling and platform system includes turbine installation tooling, pipeline tooling, control cabinet, silencer, etc. The installation tooling is mainly responsible for installing and fixing the test products and pipelines. The control cabinet is responsible for installing the power supply, chassis, display screen and other power measurement and control systems and the test bench start switch as well as the sensor and pipeline hardware system. The silencer mainly provides a relatively quiet test environment for the test to accurately measure the operating noise of the turbine fan.

[0076] The hardware of the power supply and measurement and control system test control equipment mainly includes display screen, keyboard, PXI chassis, programmable power supply and acquisition board.

[0077] The sensor and piping system consists of two parts: the sensor system and the piping system. The sensor system includes flow meters, temperature sensors, pressure sensors, differential pressure sensors, and noise meters. The piping system includes pipelines, filters, regulating valves, and sealed pipeline joints. The pipelines are made of stainless steel and plastic pipes. All pipelines undergo strict oil and dust removal processes to meet medical grade cleanliness requirements. Stainless steel elbows and joints are welded. The function of the piping system is to connect filters, sensors, regulating valves, and turbine fans to form a complete circulation system. The sealing joint adopts a double ferrule structure that does not require welding and has a good sealing effect.

[0078] The host computer software system is a program development environment software that adopts a modular approach, with a clear hierarchy, clear module functions, clear interface relationships and mutual call relationships, and independent modules for easy maintenance. The software adopts corresponding control algorithms based on the input and output data structures to ensure the speed stability of the system operation. The software is designed with manual and automatic experimental methods, which are flexible to choose from, and the remote automatic control is flexible and reliable. The software has the ability to automatically analyze and calculate. When the performance curve is determined by the automatic test method, the validity of the collected data will be analyzed. When the data fluctuation is less than the fluctuation coefficient Fc1 and F c2 The default threshold is 1%, which can be set according to the product characteristics. c1 and F c2 The calculation formula is as follows:

[0079]

[0080] Where: N is the number of data points collected over a period of time, P i The pressure or differential pressure data collected by the sensor.

[0081] When F c1 and F c2 When all values ​​are less than the preset threshold, the data points collected during this period are considered valid data.

[0082] The software supports setting the test speed range and speed change interval, flow range and change interval and other control parameters. The system can automatically shut down after the experiment. The system can process the test data to form a full performance curve. The fitting algorithm of the performance curve is the least squares method, and the fitting curve equation is:

[0083] D=a1Q 2 +a2Q+a3

[0084] Among them: Q represents flow rate, D is the data to be fitted, including inlet and outlet pressure ratio, power, and efficiency. Among them, power can be directly collected by the host computer control system, efficiency is obtained based on power, inlet and outlet pressure ratio is the ratio of inlet and outlet pressures, and is obtained based on the inlet temperature, inlet pressure, inlet and outlet pressure difference, outlet temperature, and outlet flow of the turbine fan under different gas flow rates collected at different target speeds.

[0085] The steps to solve the equation are as follows:

[0086] First, the actual test data D under each flow rate is obtained i and the fitted value D i The sum of the squares of the differences:

[0087]

[0088] Taking partial derivatives of F(a1,a2,a3) we get the linear equation system:

[0089]

[0090] Solve the equations to get the parameters a1, a2, and a3, and fit the turbine pressure, power, and efficiency to get the turbine full performance curve. After the calculation is completed, a Word test report can be generated, and all the test data can also be exported through Excel.

[0091] Example:

[0092] The present invention provides an experimental platform dedicated to conventional and transient response (10ms level) testing of medical turbine blowers. The platform has millisecond-level rapid response and data acquisition, storage and processing capabilities, as well as remote control monitoring and fault alarm functions, and can perform 24-hour uninterrupted durability tests. The platform provides a good testing environment for studying turbine start-stop, transient response, aerodynamic performance, hump characteristics and noise characteristics.

[0093] The turbine fan performance experimental platform of the present invention mainly includes a tooling platform system, a power supply and measurement and control system, a sensor and piping system, and a host computer control system.

[0094] like Figure 1 and Figure 2 The tooling and platform system includes a control cabinet 1-1, a silencer 1-2, a turbine installation tooling 1-3, an experimental cabin 1-4, a pipeline tooling 1-5, an observation window 1-6, a front panel 1-7, and a cooling fan 1-8.

[0095] The control cabinet 1-1 is a double-layer frame structure with a cabinet door structure, which is divided into two left and right areas. The left and right areas are each divided into an upper and lower multi-layer structure. The cabinet is mainly used to install various functional modules.

[0096] The left area is equipped with a power supply and a measurement and control system, and the upper left front frame is inlaid with a display screen 2-1 for displaying test data. In the middle of the left side of the cabinet 1-1, a drawer-type structure is set below the display to place a keyboard 2-2. The lower left part of the cabinet is divided into two grids to place an acquisition PXI chassis 2-3 and a programmable power supply 2-4. The acquisition board 2-5 is installed on the back of the lower left part of the cabinet.

[0097] The silencer 1-2 uses a sound-absorbing cotton to eliminate background noise and ensure the test accuracy during the test. The sound-absorbing cotton is evenly applied to the inner side of the front panel 1-7. The front panel 1-7 is installed in the upper right area of ​​the cabinet 1-1 using a connecting rod. The front panel 1-7 can be closed during the test. An observation window 1-6 is left on the surface of the front panel 1-7 for observing the product status during the test. During the test, when the front panel 1-7 is closed, the product operation noise can be tested and recorded by the noise tester 3-1 hung on the side wall of the cabinet.

[0098] The right side of the cabinet 1-1 is divided into two layers, with a partition plate in the middle. The turbine installation tool 1-3 is installed on part of the partition plate. Figure 4The installation tool 1-3 consists of three parts, wherein the lower bracket 1-3-2 is pre-fixed on the surface of the partition plate, and the upper semicircular part of the lower bracket 1-3-1 is combined with the corresponding semicircular part of the upper bracket 1-3-1, and this part is used to fix the motor part of the turbine fan 5. After the turbine fan is installed, it is fastened with the locking nuts 1-3-3 at both ends. The turbine fan has an inlet and an outlet respectively, wherein the inlet is connected to the turbine inlet pipeline 3-10-1, and the outlet is connected to the turbine outlet pipeline 3-10-2.

[0099] The lower layer on the right side of the cabinet 1-1 is the experimental cabin 1-4, in which the main test piping system is installed and fixed. The upper part is used to install the product, and the lower part is used to install the piping and sensor system 3.

[0100] The sensor and piping system consists of piping, sensors (flow, temperature, pressure, differential pressure), filters and regulating valves. The piping system is installed inside the experimental cabin 1-4. To evaluate the performance of the medical turbine, temperature and pressure sensors are arranged at the turbine inlet and outlet. The flow sensor is arranged after the turbine outlet temperature sensor 3a-6 and the pressure sensor. The flow is adjusted by the automatic regulating valve during the test. All sensors used have high-precision (2ms level) data output capabilities to ensure the accuracy of product transient testing.

[0101] The pipeline system adopts a multi-channel parallel mode, in which the first three channels are performance tests, namely the first performance channel 3a, the second performance channel 3b, and the third performance channel 3c, which can ensure that three products can be tested at the same time. The last two channels are life test first life channel 3d and second life channel 3e.

[0102] like Figure 3 The main layout of the performance test circuit (3a, 3b, 3c) is as follows: a circular first filter 3a-2 is set at the air intake end, and an inlet temperature sensor 3a-3 and an inlet pressure sensor 3a-4 are arranged in sequence downstream of the filter. The sensors are all set on the first pipeline 3-10, and a pressure difference sensor 3a-9 is set before and after the turbine. The pressure difference sensor 3a-9 and the inlet and outlet pipelines 3-10 adopt a double sealing joint 3-11 with a double sealing function.

[0103] like Figure 5 The double sealing joint 3-11 comprises four parts: a jacket nut 3a-11-1, a threaded joint 3a-11-4, a front ferrule 3a-11-3 and a rear ferrule 3a-11-2. After the jacket nut 3a-11-1 and the threaded joint 3a-11-4 are tightened, the front ferrule 3a-11-3 and the rear ferrule 3a-11-2 between the two are compressed to achieve reliable sealing. After the sealing joint is locked by the nut, the front ferrule sealing surface and the rear ferrule sealing surface cooperate with each other to seal.

[0104] like Figure 6 The front and rear ferrules of the threaded joint each have a sealing surface. The front ferrule sealing surface 3a-11-3.1 line equation is:

[0105] y1=a2x1 3 -b2x1 2 +c2x1

[0106] Among them: a2=6~7; b2=2.8~3.3; c2=0.3~0.8.

[0107] The 3a-11-2.1 line equation of the rear ferrule sealing surface is:

[0108] y2=a1x2 3 -b1x2 2 +c1x2

[0109] Among them: a1=14.5~15.5; b1=7~7.5; c1=1.0~1.5.

[0110] The outlet temperature sensor 3a-6 and the flow sensor 3a-7 are installed at the rear of the performance path turbine, and finally the first flow regulating valve 3a-8 is installed.

[0111] A second filter 3d-2 is provided at the inlet of the life test circuit, and a second flow regulating valve 3d-8 is provided at the second pipeline 3d-10 and the rear of the turbine blower.

[0112] The power supply and measurement and control system includes a display screen 2-1, a keyboard 2-2, a PXI chassis, a program-controlled power supply 2-4, and an acquisition board 2-5. Its main function is to supply power to the product under test and the sensor, and to complete the output acquisition of the sensor and the turbine. At the same time, the power supply has a program control function that can realize automatic voltage regulation and power on and off functions.

[0113] The host computer system is divided into two parts. One part uses CAN communication to communicate and control with the test product. It can control multiple products at the same time and has a unified software that can set the upper pressure limit, pressure increase rate, and pressure holding time. It can automatically stop after the experiment is completed. The other part of the host computer system is to collect, store and process sensor data, and can automatically draw performance curves and generate experimental reports and data tables.

[0114] There are three main types of turbine fan tests. One of the conventional performance tests is conducted on the first performance path. The test method is to control the turbine to work stably at the target speed through the host computer, change the flow rate through the regulating valve, collect the pressure and temperature at different flow rates, and repeat the test at different speeds after completion, so as to obtain the full performance curve of the turbine fan, and automatically calculate and display the hump performance parameters such as the ratio of peak pressure to dead point pressure at each speed, peak pressure flow rate, etc. The second test is to examine the law of performance parameter changes of the turbine fan during transient speed change. This experiment can be conducted on the first performance path 3a, the second performance path 3b, and the third performance path 3c. This arrangement can ensure that up to 3 products can be tested at the same time. During the test, the host computer program controls the turbine to perform speed change operation to simulate the actual use conditions. The flow and pressure change data during the speed change are obtained through high-frequency data acquisition. The host computer system processes the data to obtain the turbine speed change operation performance curves measured in each path, and automatically calculates parameters such as response time, pressure and flow amplitude. Since medical turbo blowers have high transient speed change requirements, the test system must have transient test capabilities.

[0115] The third test is the life test, which is conducted on the first life path 3d and the second life path 3e. The life test is conducted 24 hours a day without interruption. The life test adopts two working modes, one is fixed speed operation and the other is variable speed operation. During the life test, the test bench can collect and analyze the noise, power and motor speed data in real time, set alarm values, and automatically shut down when the alarm values ​​are exceeded.

[0116] All the pipelines in the present invention adopt medical-grade systems and meet the requirements of biocompatibility indicators.

[0117] The present invention has been described in detail above in conjunction with specific implementations and exemplary examples, but these descriptions cannot be understood as limiting the present invention. Those skilled in the art understand that, without departing from the spirit and scope of the present invention, a variety of equivalent substitutions, modifications or improvements may be made to the technical solution of the present invention and its implementation methods, all of which fall within the scope of the present invention. The scope of protection of the present invention shall be subject to the attached claims.

[0118] The contents not described in detail in the specification of the present invention belong to the common knowledge of those skilled in the art.

Claims

1. A medical turbine blower performance test bench, characterized in that: include: Sensors and piping systems (3); The sensor and pipeline system (3) includes a performance circuit for testing the performance of the turbine fan, a life circuit for testing the life of the turbine fan, and a noise tester for collecting the operating noise of the turbine fan; The performance path comprises an air inlet, an inlet temperature sensor (3a-3), an inlet pressure sensor (3a-4), a pressure difference sensor (3a-9), an outlet temperature sensor (3a-6), a flow sensor (3a-7), a first flow regulating valve (3a-8) and an exhaust port which are arranged in sequence; the inlet temperature sensor (3a-3), the inlet pressure sensor (3a-4), the pressure difference sensor (3a-9), the outlet temperature sensor (3a-6) and the flow sensor (3a-7) are respectively used to obtain the inlet temperature, inlet pressure, inlet and outlet pressure difference, outlet temperature and outlet flow of the turbo blower to be tested; the first flow regulating valve (3a-8) is used to adjust the gas flow in the performance path; The life path comprises an air inlet, a second flow regulating valve (3d-8) and an exhaust port which are arranged in sequence; the second flow regulating valve (3d-8) is used to regulate the gas flow in the life path.

2. A medical turbo blower performance test bench according to claim 1, characterized in that: The number of performance paths is greater than or equal to 3, the number of life paths is greater than or equal to 2, and each performance path and life path is arranged in parallel to perform performance tests or life tests on multiple turbine fans at the same time.

3. A medical turbo blower performance test bench according to claim 1, characterized in that: The two interface pipelines of the differential pressure sensor (3a-9) are respectively connected to the turbine inlet pipeline (3-10-1) and the turbine outlet pipeline (3-10-2) through two sealing joints; the turbine inlet pipeline (3-10-1) is a pipeline between the air inlet and the turbine fan inlet, and the turbine outlet pipeline (3-10-2) is a pipeline between the turbine fan outlet and the exhaust port.

4. A medical turbo blower performance test bench according to claim 3, characterized in that: The sealing joint is a double sealing joint (3-11); The double sealing joint (3-11) comprises a jacket nut (3a-11-1), a threaded joint (3a-11-4), a front ferrule (3a-11-3) and a rear ferrule (3a-11-2); The threaded joint (3a-11-4) is welded to the turbine inlet pipeline (3-10-1) or the turbine outlet pipeline (3-10-2); the outer sleeve nut (3a-11-1) is sleeved on the outside of the interface pipeline of the differential pressure sensor (3a-9); the front ferrule (3a-11-3) and the rear ferrule (3a-11-2) are sleeved on the outside of the interface pipeline of the differential pressure sensor (3a-9) and are located between the outer sleeve nut (3a-11-1) and the threaded joint (3a-11-4); After the outer sleeve nut (3a-11-1) and the threaded joint (3a-11-4) are screwed into place, the front ferrule (3a-11-3) and the rear ferrule (3a-11-2) are pressed tightly, and the front ferrule (3a-11-3) and the rear ferrule (3a-11-2) are matched through the sealing surface to achieve sealing between the turbine inlet pipeline (3-10-1) or the turbine outlet pipeline (3-10-2) and the interface pipeline of the differential pressure sensor (3a-9).

5. A medical turbo blower performance test bench according to claim 4, characterized in that: In the axial section, the sealing surface of the front ferrule (3a-11-3) conforms to the following linear equation: y1=a2x1 3 -b2x1 2 +c2x1; Wherein, (x1, y1) is a point in the coordinate system x1o1y1, with the direction of the threaded joint (3a-11-4) being low and the direction of the outer sleeve nut (3a-11-1) being high, the origin of the coordinate system x1o1y1 being the lowest point where the front ferrule (3a-11-3) contacts the outer surface of the interface pipeline of the differential pressure sensor (3a-9), and the x1 axis is parallel to the axial direction of the interface pipeline of the differential pressure sensor (3a-9) pointing to the high direction; a2=6~7; b2=2.8~3.3; c2=0.3~0.

8.

6. A medical turbo blower performance test bench according to claim 4, characterized in that: In the axial section, the sealing surface of the rear ferrule (3a-11-2) conforms to the following linear equation: y2=a1x2 3 -b1x2 2 +c1x2; Wherein, (x2, y2) is a point in the coordinate system x2o2y2, with the direction of the threaded joint (3a-11-4) being low and the direction of the outer sleeve nut (3a-11-1) being high, the origin of the coordinate system x2o2y2 being the lowest point where the rear ferrule (3a-11-2) contacts the outer surface of the interface pipeline of the differential pressure sensor (3a-9), and the x2 axis being parallel to the axial direction of the interface pipeline of the differential pressure sensor (3a-9) pointing to the high direction; a1=14.5~15.5; b1=7~7.5; c1=1.0~1.

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7. A medical turbo blower performance test bench according to claim 1, characterized in that: It also includes a tooling and platform system (1), a power supply and measurement and control system (2) and a host computer control system; The power supply and measurement and control system (2) is used to supply power to the tooling and platform system (1), the host computer control system and the sensor and pipeline system (3), and to collect test data of sensors in the sensor and pipeline system (3); The host computer control system is used to control the opening of the flow regulating valve and the working state of the turbine fan in the sensor and pipeline system (3); The tooling and platform system (1) includes a control cabinet (1-1), a silencer (1-2), a turbine installation tooling (1-3), an experimental cabin (1-4), an observation window (1-6) and a cooling fan (1-8); The control cabinet (1-1) is used to accommodate a power supply and measurement and control system (2) and an experimental cabin (1-4); the silencer (1-2) is used to eliminate background noise during the test and realize the collection of turbine fan noise; the turbine installation tool (1-3) is used to fix the turbine fan; the experimental cabin (1-4) is used to accommodate a sensor and a pipeline system (3); the observation window (1-6) is used to observe the state of the turbine fan during the test; and the cooling fan (1-8) is used to dissipate heat from the turbine fan during the test.

8. A medical turbo blower performance test bench according to claim 7, characterized in that: The turbine installation tool (1-3) comprises a lower bracket (1-3-2) and an upper bracket (1-3-1); The upper bracket (1-3-1) and the lower bracket (1-3-2) are both provided with semicircular grooves. The upper bracket (1-3-1) and the lower bracket (1-3-2) are combined to fix the motor part of the turbine fan. The upper bracket (1-3-1) and the lower bracket (1-3-2) are fastened by a locking nut (1-3-3).

9. A medical turbo blower performance test method, characterized in that: The medical turbo blower performance test bench according to any one of claims 1 to 8 is used to implement the test, including a turbo blower performance test or a life test; The performance test of the turbo fan includes conventional performance test or transient speed change test; Conventional performance test methods include: S1.1 makes the turbo fan work stably at the target speed; S1.2 regulating the gas flow in the performance path through the first flow regulating valve (3a-8); S1.3 Collect the inlet temperature, inlet pressure, inlet and outlet pressure difference, outlet temperature and outlet flow rate of the turbo blower at different gas flow rates; S1.4 changes the target speed of the turbo fan and repeats steps S1.1 to S1.3; S1.5 Obtain the full performance curve or hump performance of the turbo blower according to the inlet temperature, inlet pressure, inlet and outlet pressure difference, outlet temperature and outlet flow rate of the turbo blower at different gas flow rates collected at different target speeds; The methods of transient speed change test include: S2.1 makes the turbo fan run at variable speed to simulate the actual working condition; S2.2 collects the operating noise, inlet temperature, inlet pressure, inlet and outlet pressure difference, outlet temperature and outlet flow of the turbo fan in real time; S2.3 obtains the transient performance of the turbo fan according to the inlet temperature, inlet pressure, inlet and outlet pressure difference, outlet temperature and outlet flow rate of the turbo fan collected in real time; The methods for turbine fan life test include: The turbo fan is made to run continuously for a predetermined time under constant speed or variable speed conditions, and the operating noise, power, and motor speed data of the turbo fan are collected in real time during the operation. When the monitored operating data exceeds the alarm value, the working life of the turbo fan is obtained and it is automatically shut down.

10. A medical turbo blower performance test method according to claim 9, characterized in that: In step S1.5, the full performance curve of the turbo blower includes a corresponding relationship curve between the inlet and outlet pressure ratio and the flow rate, a corresponding relationship curve between the power and the flow rate, or a corresponding relationship curve between the efficiency and the flow rate; The full performance curve of the turbo fan is obtained by the fitting method. The fitting equation of the full performance curve of the turbo fan is: D=a1Q 2 +a2Q+a3; where Q represents the outlet flow rate, D represents the fitting value of the inlet and outlet pressure ratio, power or efficiency, and a1, a2, and a3 represent the parameters to be fitted; When collecting pressure or differential pressure data, the data with a data fluctuation coefficient less than the preset threshold is regarded as valid data. The data fluctuation coefficient is F c1 and F c2 : Where N is the total number of data points collected within the predetermined time period, P i is the collected pressure or pressure difference data point, 1≤i≤N.

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