CN112179670B - Paddle fan tester for measuring paddle fan aerial data - Google Patents
Paddle fan tester for measuring paddle fan aerial data Download PDFInfo
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- CN112179670B CN112179670B CN202011045599.2A CN202011045599A CN112179670B CN 112179670 B CN112179670 B CN 112179670B CN 202011045599 A CN202011045599 A CN 202011045599A CN 112179670 B CN112179670 B CN 112179670B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
- G01M15/14—Testing gas-turbine engines or jet-propulsion engines
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
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Abstract
The paddle fan tester is characterized in that an inner ring of a first deep groove ball bearing is in interference fit with a first paddle fan shaft and is axially positioned based on a shaft shoulder of the first paddle fan shaft, an outer ring of the first deep groove ball bearing is in interference fit with an inner ring of a bearing seat, a protruding part of the inner ring of the first bearing seat axially positions 2/3 of the outer ring of the first deep groove ball bearing, the inner ring of the first bearing seat and the outer ring of the first bearing seat are radially positioned based on tooth crests and tooth roots arranged in the circumferential direction, a pressure sensor is arranged in a threaded hole between the inner ring of the first bearing seat and an end cover of the first bearing seat, a second bearing and second bearing seat assembly supports a second paddle fan shaft, the inner ring of the second bearing is in interference fit with the second paddle fan shaft and is positioned through the shaft shoulder of the second paddle fan shaft, the outer ring of the second bearing and the second bearing seat are positioned through an elastic gasket, and a controller sends a first signal to a first electronic speed regulator and a second electronic speed regulator to adjust the first rotating speed and the second rotating speed regulator.
Description
Technical Field
The invention relates to the technical field of measurement of a paddle fan, in particular to a paddle fan tester for measuring paddle fan airborne data.
Background
Compared with other jet engines, the paddle fan engine has the main advantage of low fuel consumption rate, and also has the advantages of high cruising height and high cruising speed. The advantages promote the propeller fan engine to be more suitable for popularization and use under the low-altitude low-speed task condition. The paddle fan engine with excellent design performance and the robust control system thereof need to have a complete paddle fan engine component level model, while the high-precision paddle fan engine physical model needs a paddle fan component characteristic rule with high confidence level. The paddle fan component has the characteristic of multiple small-diameter paddles, provides most of propelling force for the front-row paddles of the paddle fan, and can eliminate vortexes generated by the front-row paddles and blades of the rear-row paddle fan, so that vibration and noise generated in the using process are reduced.
The equivalent bypass ratio of the paddle fan engine is large, the thrust can be reduced quickly along with the increase of the flight Mach number, and therefore the design point of the paddle fan engine is generally selected to be a cruise state. The method for constructing the paddle fan component model is to correct the paddle fan model based on test data, so that a paddle fan tester needs to be designed to carry an unmanned aerial vehicle to obtain characteristic data of the paddle fan component.
Due to the importance of test data to the characteristics of the paddle fan component, it is essential to design a paddle fan tester with high test precision to acquire the test data, and a tester meeting the function of measuring the paddle fan data in the air is lacked so far.
The above information disclosed in the background section is only for enhancement of understanding of the background of the invention and therefore it may contain information that does not form the prior art that is well known to those of ordinary skill in the art.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a paddle fan tester for measuring paddle fan air data, which is aimed at the paddle fan air data acquisition, and has high measurement accuracy and a light structure, and obtains the rotation speed data and the tension data of a paddle fan, and can also measure the input power of a motor, and can effectively correct a paddle fan component model, obtain a more reliable paddle fan component model, and further obtain a paddle fan component characteristic diagram.
The purpose of the invention is realized by the following technical scheme.
A paddle fan tester for measuring paddle fan airborne data includes,
the intermediate bearing comprises an intermediate bearing outer ring and an intermediate bearing inner ring, the intermediate bearing outer ring is axially positioned based on the end face of the hub of the first propeller fan blade, the intermediate bearing inner ring is axially positioned based on the shaft shoulder of the second propeller fan shaft,
a first fan blade connected with the spline shaft portion of the first fan shaft through the spline hole of the inner hub,
a first deep groove ball bearing and a first bearing seat assembly body which supports the first paddle fan shaft, wherein an inner ring of the first deep groove ball bearing is in interference fit with the first paddle fan shaft, the assembly body is axially positioned based on a shaft shoulder of the first paddle fan shaft, an outer ring of the first deep groove ball bearing is in interference fit with an inner ring of the first bearing seat, a protruding part of the inner ring of the first bearing seat is axially positioned at 2/3 of the outer ring of the first deep groove ball bearing, an addendum is circumferentially arranged on the inner ring of the first bearing seat, a dedendum is circumferentially arranged on the outer ring of the first bearing seat, the addendum and the dedendum are radially positioned, and an end cover of the first bearing seat is fixed with an outer ring of the first bearing seat by bolts,
a first motor connected to and driving rotation of the first fan shaft to actuate rotation of the first fan blade at a first rotational speed,
a power meter which is arranged between the first electronic speed regulator and the connection circuit of the first motor, measures the input power signal of the first motor, the power signals generated by the first motor and the second motor are consistent because the first motor and the second motor are controlled by the same controller,
a first electronic governor connected to the first motor to adjust a rotational speed thereof,
the pressure sensor is arranged in a threaded hole between the inner ring of the first bearing seat and the end cover of the first bearing seat, a lead of the pressure sensor extends out from a hole groove arranged on the circumferential direction of the end cover of the first bearing seat, the types of the first paddle fan blade and the second paddle fan blade are respectively a positive paddle and a negative paddle, so that the directions of generated pulling forces are consistent, and a signal measured by the pressure sensor is the resultant force generated by the first paddle fan blade and the second paddle fan blade,
a second paddle fan blade which comprises a shaft shoulder for positioning and installing the intermediate bearing inner ring, the second paddle fan blade is connected with a second paddle fan shaft at the axis position,
a second bearing and second bearing seat assembly body which supports the second paddle fan shaft, wherein the inner ring of the second bearing is in interference fit with the second paddle fan shaft and is positioned by a shaft shoulder, the outer ring of the second bearing and the second bearing seat are positioned by an elastic gasket,
a second motor connected to and driving the second fan shaft to rotate to actuate the second fan blade to rotate at a second rotational speed,
a rotational speed sensor comprising a semiconductor end provided on the second bearing housing end cap and a plurality of magnetically attractive plates circumferentially arranged on the second fan shaft, the semiconductor end facing the magnetically attractive plates to measure the second rotational speed,
a second electronic governor connected to the second motor to adjust a rotational speed thereof,
the processing unit comprises a processing unit and a control unit,
a controller that sends first signals to the first and second electronic governors to adjust first and second rotational speeds,
and the storage unit stores data measured by the pressure sensor, the rotating speed sensor and the power meter, and comprises a RAM memory and an SD card.
In the paddle fan tester for measuring paddle fan airborne data, the first electronic speed regulator and the second electronic speed regulator are respectively provided with speed closed-loop control so as to realize motor rotating speed closed-loop control according to a preset rotating speed given by the controller, the second rotating speed and the first rotating speed are in reverse constant speed, and the storage unit comprises a RAM memory and an SD card.
In the paddle fan tester for measuring the data in the paddle fan, the controller comprises a ground remote controller, a receiver, a first electronic speed regulator and a second electronic speed regulator, wherein the ground remote controller transmits a high-frequency pulse signal to be received by the receiver arranged on the paddle fan tester, the receiver amplifies and demodulates the high-frequency pulse signal to be transmitted to the first electronic speed regulator and the second electronic speed regulator, the first electronic speed regulator and the second electronic speed regulator adjust the duty ratio according to the received high-frequency signal, the first electronic speed regulator and the second electronic speed regulator output PWM signals to control the rotating speed of the first motor and the second motor, a rotating speed sensor transmits the acquired rotating speed signal to an AD converter in a voltage pulse signal form to be converted into a digital signal and transmits the digital signal to a DSP system to finish the acquisition and storage of the rotating speed signal, a power meter measures the input power signal of the first motor and stores the input power signal into an RAM and an SD card through the AD converter and the DSP system, and a resistance value is generated by the stress of a resistance film in a pressure sensor, the voltage signal value of the resistance value is measured and amplified by a power amplifier to form a 0-3V voltage signal, the voltage signal is converted into a digital signal by an AD converter on a DSP system, and the digital signal is stored in an RAM for transfer and then stored in an SD card.
The paddle fan tester for measuring the data in the paddle fan is characterized in that a first accessory box fixed by an accessory box support is placed at the left end of a first motor, a receiver, a common 12V lithium battery, a first large-capacity model airplane lithium battery, a first electronic speed regulator, a power meter, a power amplifier, a DSP system and an AD converter, an RAM memory and an SD card of the DSP system are placed in the first accessory box, a second accessory box fixed by the accessory box support is placed at the right end of a second motor, and a second large-capacity model airplane lithium battery and a second electronic speed regulator are placed in the second accessory box.
In the paddle fan tester for measuring paddle fan airborne data, the DSP system receives a second signal of the controller through the radio frequency module to control the data acquisition to be started and closed.
In the paddle fan tester for measuring the paddle fan air data, the power meter is connected between the first electronic speed regulator and the first motor to measure the power signal of the first motor,
in the paddle fan tester for measuring paddle fan airborne data, the first paddle fan blade is connected with a spline shaft end of a first paddle fan shaft through a local spline hole of a hub of the first paddle fan blade in a meshed mode, the first paddle fan shaft is connected with a first motor through a first coupler, the second paddle fan blade is connected with a spline shaft end of a second paddle fan shaft through a local spline hole of the hub of the second paddle fan blade in a meshed mode, and the second paddle fan shaft is connected with a second motor through a second coupler.
In the paddle fan tester for measuring paddle fan airborne data, the first motor is clamped and fixed by the upper cover of the first motor seat and the lower cover of the first motor seat, and the second motor is clamped and fixed by the upper cover of the second motor seat and the lower cover of the second motor seat.
In the paddle fan tester for measuring paddle fan airborne data, the section diameters of all parts of the paddle fan tester in the circumferential direction are not larger than the diameter of the first paddle fan hub or the second paddle fan hub.
In the paddle fan tester for measuring the paddle fan airborne data, the first paddle fan blade and the second paddle fan blade are tested scaled paddle models.
In the paddle fan tester for measuring paddle fan airborne data, the first paddle fan blade and the second paddle fan blade are arranged in the same axial direction but opposite in rotating speed direction, and the second bearing seat is provided with a rotating speed sensor for measuring the second rotating speed of the second paddle fan blade.
The invention relates to a paddle fan tester which consists of two parts, namely a structural design part and an electric control and data acquisition loop. The structural design part comprises component components, mounting and positioning modes among the component components, and arrangement modes of a pressure sensor, a rotating speed sensor and a power meter. The electric control part comprises a connection mode of hardware control equipment, and the voltage value of the motor is directly controlled by a high-frequency pulse signal output by remote control, so that the rotating speed of the motor is changed. The tension value generated by the paddle fan is collected by using the pressure sensor, and the data collection is carried out by using the power amplifier to transmit a signal to the DSP system so as to be stored in the corresponding storage equipment. The reliable structure of the paddle fan tester is the basis of test data, the electric control and data acquisition loop is a direct mode of rotating speed control and data acquisition, and the electric control and data acquisition loop and the rotating speed control and the data acquisition loop supplement each other to provide a basis for data acquisition with high confidence level.
The above description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly apparent, and to make the implementation of the content of the description possible for those skilled in the art, and to make the above and other objects, features and advantages of the present invention more obvious, the following description is given by way of example of the specific embodiments of the present invention.
Drawings
Various other advantages and benefits of the present invention will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. It is obvious that the drawings described below are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort. Also, like parts are designated by like reference numerals throughout the drawings.
In the drawings:
FIG. 1 is a schematic cross-sectional view of a paddle fan tester for measuring paddle fan airborne data according to one embodiment of the present invention;
FIG. 2 is an axis plot of a paddle fan tester for measuring paddle fan airborne data according to one embodiment of the present invention;
FIG. 3 is a schematic cross-sectional view of a bearing and bearing block assembly of a paddle fan tester for measuring data in a paddle fan air, according to one embodiment of the present invention;
FIG. 4 is a schematic structural view of a bearing and bearing mount assembly isometric view of a paddle fan tester for measuring paddle fan airborne data according to one embodiment of the present invention;
figure 5 is a schematic diagram of the electrical control and data acquisition circuitry of a paddle fan tester for measuring paddle fan airborne data according to one embodiment of the present invention.
The invention is further explained below with reference to the figures and examples.
Detailed Description
Specific embodiments of the present invention will be described in more detail below with reference to fig. 1 to 5. While specific embodiments of the invention are shown in the drawings, it should be understood that the invention may be embodied in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
It should be noted that certain terms are used throughout the description and claims to refer to particular components. As one skilled in the art will appreciate, various names may be used to refer to a component. This specification and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. The description which follows is a preferred embodiment of the invention, but is made for the purpose of illustrating the general principles of the invention and not for the purpose of limiting the scope of the invention. The scope of the present invention is defined by the appended claims.
For the purpose of facilitating understanding of the embodiments of the present invention, the following description will be made by taking specific embodiments as examples with reference to the accompanying drawings, and the drawings are not to be construed as limiting the embodiments of the present invention.
For better understanding, as shown in fig. 1 to 5, a paddle fan tester for measuring paddle fan airborne data includes,
an intermediate bearing 10, which comprises an intermediate bearing outer ring, an intermediate bearing inner ring and a rolling body, wherein the intermediate bearing outer ring is axially positioned based on the hub end face of the first blade fan blade 9, the intermediate bearing inner ring is axially positioned based on the shaft shoulder of the second blade fan shaft 15,
a first fan blade 9, said first fan blade 9 being connected to the splined shaft portion of the first fan shaft 6 through the splined hole of the inner hub,
the first deep groove ball bearing 25 and the first bearing seat assembly 8 support the first paddle fan shaft 6, the inner ring of the first deep groove ball bearing 25 is in interference fit with the first paddle fan shaft 6 and is axially positioned based on the shaft shoulder of the first paddle fan shaft 6, the outer ring of the first deep groove ball bearing 25 is in interference fit with the inner ring of the bearing seat, the protruding part of the inner ring of the first bearing seat axially positions 2/3 of the outer ring of the first deep groove ball bearing 25, the inner ring of the first bearing seat and the outer ring of the first bearing seat are radially positioned based on the tooth crests and tooth roots which are circumferentially arranged, the end cover of the first bearing seat is fixed with the outer ring of the first bearing seat through bolts,
a first motor 3 connected to and driving the first fan shaft 6 in rotation to actuate the first fan blades 9 in rotation at a first rotational speed,
a first electronic governor connected to the first motor 3 to adjust the rotation speed thereof,
a pressure sensor 29 which is arranged in the threaded holes of the bearing seat inner ring and the bearing seat end cover and is used for measuring the closing pulling force generated by the first and the second paddle fan blades, the lead of the pressure sensor 29 is extended out from the circumferential hole groove of the bearing seat end cover,
a second fan blade 11, the second fan blade 11 is connected with a second fan shaft 15 through an inner spline hole at the axial center position,
a second bearing 14 and a second bearing seat 13 assembly body which supports the second paddle shaft 15, wherein the inner ring of the second bearing 14 is in interference fit with the second paddle shaft 15 and is positioned by a shaft shoulder, the outer ring of the second bearing 14 is positioned by an elastic gasket with the second bearing seat 13,
a second motor 20 connected to and driving the second fan shaft 15 to rotate to actuate the second fan blade 11 to rotate at a second rotational speed,
a rotational speed sensor 30 including a semiconductor end provided on an end cover of the second bearing housing 13 and a plurality of magnetic attraction pieces circumferentially arranged on the second paddle shaft 15, the semiconductor end facing the magnetic attraction pieces to measure the second rotational speed,
a second electronic governor connected to the second motor 20 to adjust the rotation speed thereof,
the processing unit comprises a processing unit and a control unit,
a controller that sends first signals to the first and second electronic governors to adjust first and second rotational speeds,
the DSP system receives a second signal of the controller through the radio frequency module to control the data acquisition to be switched on and off,
and the storage unit is connected with the DSP system, the pressure sensor 29, the rotating speed sensor 30 and the power meter and is used for storing the test data of the three types of sensors.
In one embodiment, the rotational speed sensor includes a semiconductor end provided on the second bearing housing and 4 magnetically attractive plates circumferentially arranged on the second fan shaft.
In one embodiment, the existing characteristics of the paddle fan component mainly comprise wind tunnel test and data test of a manned aircraft platform. The pressure sensor arrangement method is unique, adopts the scaling model of the paddle fan blades, has the characteristics of small structural volume and high data testing precision, and can be skillfully combined with the micro fixed wing unmanned aerial vehicle. The miniature unmanned aerial vehicle is used as a test platform to provide a high-altitude flight environment required by test, and the paddle fan tester is used as a test main body and is responsible for collecting paddle fan test data. Compared with wind tunnel test, the invention can provide a high-altitude test environment, is more real than the wind tunnel test environment, and has the important advantage of greatly reducing the test cost compared with a test method of a manned unmanned aerial vehicle platform.
In one embodiment, the whole structure of the tester adopts a scheme of approximately symmetrical arrangement. As shown in figure 1, the rest parts of the structure I and the structure II are identical except for the paddle fan shaft, the bearing seat and the bearing seat bracket. The first paddle fan blade 9 is meshed with the spline shaft end of the first paddle fan shaft 6 through the local spline hole of the hub of the first paddle fan blade, the first paddle fan shaft 6 is connected with the motor shaft 3 through the first coupler 5, and the first motor 3 is clamped and fixed by the first motor base upper cover 24 and the first motor base lower cover 23. A first accessory box 1 is arranged at the left end of the motor and fixed by a first accessory box support 2, and a receiver, a first large-capacity model airplane lithium battery, an electronic speed regulator, a power meter, a power amplifier, a DSP minimum system and an AD converter thereof, a common 12V lithium battery, an RAM memory and an SD card are arranged in the first accessory box. The first paddle fan shaft 6 is connected with the second paddle fan shaft 15 through an intermediate bearing 10, the outer ring of the intermediate bearing 10 is positioned and installed by the inner hole ladder of the first paddle fan blade 9, and the inner ring of the intermediate bearing is positioned and installed by the shaft shoulder of the second paddle fan shaft 15. The speed sensor is arranged on the second bearing block 13, 4 magnetic attraction pieces are circumferentially arranged on the second paddle fan shaft 15, and the semiconductor end of the speed sensor is aligned with the direction of the magnetic attraction pieces on the shaft. The power meter is connected between the first electronic governor and the first motor, and is placed inside the first accessory box to measure data. The first structure is symmetrical with the whole installation scheme of the second structure, only partial installation is different, and a second large-capacity model airplane lithium battery and a second electronic speed regulator are placed in the second accessory box. The bearing seat mounting schemes of the first deep groove ball bearing and the second deep groove ball bearing are different, specifically, the inner ring of the second deep groove ball bearing 14 and the second paddle fan shaft 15 are in interference fit and are positioned by using a shaft shoulder, the outer ring of the second deep groove ball bearing 14 and the second bearing seat 13 are in transition fit and are positioned by using an elastic gasket, and the second bearing seat 13 is mounted and fixed on the second bearing seat support 12.
As shown in fig. 3 and 4, the inner ring of the first deep groove ball bearing 25 is connected with the first propeller shaft 6 by interference fit, and is axially positioned by using a shaft shoulder on the first propeller shaft 6, the outer ring of the first deep groove ball bearing 25 is in transition fit with the first bearing seat inner ring 26, meanwhile, the protruding part of the bearing seat inner ring 26 is used for completing axial positioning at 2/3 of the outer ring of the first deep groove ball bearing 25, the first bearing seat inner ring 26 and the first bearing seat outer ring 27 complete radial positioning by utilizing tooth crests and tooth roots which are circumferentially arranged, the first bearing seat end cover 28 and the first bearing seat outer ring are fixed through bolts, the pressure sensor 29 is arranged in threaded holes of the first bearing seat inner ring 26 and the first bearing seat end cover 28, a lead of the pressure sensor extends out of a circumferential hole groove of the first bearing seat end cover, and the pressure sensor can measure the resultant tension generated by the first paddle fan blade and the second paddle fan blade.
All cross-sectional diameters of the whole structural design are equivalent to the size of the diameter of the hub of the paddle fan, so that the problem that the measured parameters are inaccurate due to the fact that turbulent flow conditions of airflow at the inlet of the paddle fan are caused due to the fact that the cross-sectional diameters are not matched with the size of the hub of the paddle fan is solved.
In the preferred embodiment of the paddle fan tester for measuring the paddle fan airborne data, the first electronic speed regulator and the second electronic speed regulator are respectively provided with a speed closed-loop control to realize the motor rotating speed closed-loop control according to the preset rotating speed given by the controller, the second rotating speed and the first rotating speed are in reverse constant speed, and the storage unit comprises a RAM memory and an SD card.
In the preferred embodiment of the paddle fan tester for measuring the data in the paddle fan air, the controller comprises a ground remote controller, the ground remote controller transmits a high-frequency pulse signal to be received by a receiver arranged on the paddle fan tester, the receiver amplifies and demodulates the high-frequency pulse signal to be transmitted to a first electronic speed regulator and a second electronic speed regulator, the first electronic speed regulator and the second electronic speed regulator adjust the internal duty ratio according to the received signal to output PWM waves and respectively control the rotating speeds of a first motor 3 and a second motor 20, a rotating speed sensor 30 transmits the collected rotating speed signal to an AD converter in the form of a voltage pulse signal to be converted into a digital signal and transmits the digital signal to a DSP system to finish the collection and storage of the rotating speed signal, a power meter measures the input power signal of the first motor 3 and stores the digital signal into a RAM and an SD card through the AD converter and the DSP system, a resistance value is generated by the stress of a resistance film in a pressure sensor 29, the voltage signal value of the resistance value is measured and amplified by a power amplifier to form a 0-3V voltage signal, the voltage signal is converted into a digital signal by an AD converter on a DSP system, and the digital signal is stored in an RAM for transfer and then stored in an SD card.
In the preferred embodiment of the paddle fan tester for measuring the data in the paddle fan, the first accessory box 1 fixed by an accessory box bracket is arranged at the left end of the first motor 3, the receiver, a common 12V lithium battery, a first large-capacity model airplane lithium battery, a first electronic speed regulator, a power meter, a power amplifier, a DSP system, an AD converter and a storage unit of the first large-capacity model airplane lithium battery are arranged in the first accessory box 1, the second accessory box 19 fixed by a second accessory box bracket is arranged at the right end of the second motor 20, and the second large-capacity model airplane lithium battery and the second electronic speed regulator are arranged in the second accessory box 19.
In the preferred embodiment of the described paddle fan tester for measuring data in the air of the paddle fan, a power meter is connected between the first electronic governor and the first motor 3 for measuring the power signal of the first motor 3,
in the preferred embodiment of the paddle fan tester for measuring paddle fan airborne data, the first paddle fan blade 9 is connected with the spline shaft end of the first paddle fan shaft 6 in a meshing manner through the local spline hole of the hub of the first paddle fan blade, the first paddle fan shaft 6 is connected with the first motor 3 through the first coupling 5, the second paddle fan blade 11 is connected with the spline shaft end of the second paddle fan shaft 15 in a meshing manner through the local spline hole of the hub of the second paddle fan blade, and the second paddle fan shaft 15 is connected with the second motor 20 through the second coupling 16.
In the preferred embodiment of the paddle fan tester for measuring paddle fan airborne data, the first motor 3 is clamped and fixed by the first motor base upper cover and the first motor base lower cover, and the second motor 20 is clamped and fixed by the second motor base upper cover and the second motor base lower cover.
In the preferred embodiment of the paddle fan tester for measuring paddle fan airborne data, the cross-sectional diameter of all the components of the paddle fan tester in the circumferential direction is not larger than the diameter of the first paddle fan hub or the second paddle fan hub.
In the preferred embodiment of the paddle fan tester for measuring paddle fan airborne data, the first paddle fan blade 9 and the second paddle fan blade 11 are tested scaling counter-rotating paddle fan blades.
In the preferred embodiment of the paddle fan tester for measuring the paddle fan airborne data, the first paddle fan blade 9 and the second paddle fan blade 11 are arranged in the same axial direction and in opposite rotating speed directions, the second bearing seat is provided with a rotating speed sensor for measuring the second rotating speed of the second paddle fan blade,
in one embodiment, as shown in FIG. 5, the overall framework of the paddle fan tester is divided into three paths, control, data and power. The control route mainly comprises a controller, a receiver and a radio frequency module; the data path mainly comprises a pressure sensor 29, a rotating speed sensor 30, a power meter, a DSP minimum system, an RAM memory, an SD card and the like; the power supply circuit mainly comprises a first large-capacity model airplane battery, a second large-capacity model airplane battery, a common 12V lithium battery and a voltage conversion module. Specifically, a signal of the ground controller is received through the receiver and transmitted to the electric regulator, the voltage and the current of the direct current brushless motor are regulated after the signal is received through the electric regulator, and the two direct current brushless motors respectively drive the two blades of the contra-rotating propeller fan. Meanwhile, the radio frequency module receives signals of the ground controller and transmits the signals to the DSP minimum system to control the opening and closing of the data acquisition function. The paddle fan tension data of the pressure sensor 29, the rotating speed data of the rotating speed sensor 30 and the power data of the first motor 3 are sequentially stored into the RAM and the SD card through the data conditioning module and the DSP minimum system, and the data in the SD card is led into a ground computer after the data returns to the ground. Meanwhile, in order to reduce the weight of the whole system, two electric regulators are respectively powered by two large-capacity model airplane batteries, and a common lithium battery supplies power to a power amplifier of the pull pressure sensor 29 and supplies power to the DSP minimum system after passing through the voltage reduction module.
In one embodiment, the ground remote controller transmits a high-frequency pulse signal to be received by a receiver arranged on the tester, the receiver amplifies and demodulates the received high-frequency pulse signal, and transmits the high-frequency signal to the first electronic speed regulator and the second electronic speed regulator, and the first electronic speed regulator and the second electronic speed regulator regulate internal duty ratio to output PWM waves, so that the rotating speed of the brushless motor is changed, and the rotating speed control of the first motor and the second motor is realized. Meanwhile, the electric speed regulator has a speed closed-loop control function, and can realize accurate closed-loop control of the rotating speed of the motor according to the specific preset rotating speed given by the remote controller. The rotation speed sensor 30 mounted on the second bearing seat 13 collects the rotation speed signal of the second propeller shaft 15 attached with the magnetic attraction sheet, and the rotation speed signal is sent to an AD converter in the form of a voltage pulse signal to be converted into a digital signal and is transmitted to a DSP minimum system, so that the collection and storage of the rotation speed signal are completed. And a power meter is connected between the first electric regulation and the first motor 3 to measure an input power signal of the first motor 3, and the signal is gradually stored to the RAM and the SD card through an AD converter and a DSP minimum system.
In one embodiment, the pulling force of the paddle fan is transmitted to the pulling pressure sensor 29 by the small deformation and displacement of the bearing seat inner ring 26 and the bearing seat end cover 28, the resistance diaphragm in the pressure sensor 29 can generate different resistance values when sensing the stress change, a standard 0-3V voltage signal is formed by measuring the voltage signal value of the resistance and amplifying the voltage signal value by a power amplifier, and then the standard voltage signal is converted into a digital signal by an AD converter on a DSP minimum system. Considering the difference between the storage speed and the capacity, the digital signals converted by the ADC are firstly stored in the RAM with the higher storage speed to be used as transfer and then stored in the SD card, so that the data loss caused by the power failure of the DSP system is prevented.
In one embodiment, the receiver receives the command from the hand-held remote controller and transmits the signal to two electronic speed regulators simultaneously, and the electronic speed regulators can change the voltage of the motors at the two symmetrical ends and further change the rotating speed at the two ends simultaneously. When the test environment condition is met, the DSP system sends a remote controller signal, the data acquisition function is started, a rotating speed signal, a pressure signal and a power signal are continuously acquired and stored in the RAM and the SD card through the DSP minimum system, and after data acquisition is completed, the data acquisition function is closed by receiving a remote controller instruction. In this way, the entire process of airscrew fan tester data acquisition is accomplished.
Industrial applicability
The paddle fan tester for measuring paddle fan airborne data can be manufactured and used in the paddle fan field.
The foregoing describes the general principles of the present application in conjunction with specific embodiments, however, it is noted that the advantages, effects, etc. mentioned in the present application are merely examples and are not limiting, and they should not be considered essential to the various embodiments of the present application. Furthermore, the foregoing disclosure of specific details is for the purpose of illustration and description and is not intended to be limiting, since the foregoing disclosure is not intended to be exhaustive or to limit the disclosure to the precise details disclosed.
The foregoing description has been presented for purposes of illustration and description. Furthermore, the description is not intended to limit embodiments of the application to the form disclosed herein. While a number of example aspects and embodiments have been discussed above, those of skill in the art will recognize certain variations, modifications, alterations, additions and sub-combinations thereof.
Claims (9)
1. A paddle fan tester for measuring paddle fan airborne data, comprising,
the intermediate bearing comprises an intermediate bearing outer ring and an intermediate bearing inner ring, the intermediate bearing outer ring is axially positioned based on the end face of the hub of the first propeller fan blade, the intermediate bearing inner ring is axially positioned based on the shaft shoulder of the second propeller fan shaft,
a first fan blade connected with the spline shaft portion of the first fan shaft through the spline hole of the inner hub,
a first deep groove ball bearing and a first bearing seat assembly body which supports the first paddle fan shaft, wherein an inner ring of the first deep groove ball bearing is in interference fit with the first paddle fan shaft, the assembly body is axially positioned based on a shaft shoulder of the first paddle fan shaft, an outer ring of the first deep groove ball bearing is in interference fit with an inner ring of the first bearing seat, a protruding part of the inner ring of the first bearing seat is axially positioned at 2/3 of the outer ring of the first deep groove ball bearing, an addendum is circumferentially arranged on the inner ring of the first bearing seat, a dedendum is circumferentially arranged on the outer ring of the first bearing seat, the addendum and the dedendum are radially positioned, and an end cover of the first bearing seat is fixed with an outer ring of the first bearing seat by bolts,
a first motor connected to and driving rotation of the first fan shaft to actuate rotation of the first fan blade at a first rotational speed,
a power meter, which is provided between the first electronic governor and a connection circuit of the first motor, measures an input power signal of the first motor,
a first electronic governor connected to the first motor to adjust a rotational speed thereof,
the pressure sensor is arranged in a threaded hole between the inner ring of the first bearing seat and the end cover of the first bearing seat, a lead of the pressure sensor extends out of a hole groove arranged in the circumferential direction of the end cover of the first bearing seat,
a second paddle fan blade which comprises a shaft shoulder for positioning and installing the intermediate bearing inner ring, the second paddle fan blade is connected with a second paddle fan shaft at the axis position,
a second bearing and second bearing seat assembly body which supports the second paddle fan shaft, wherein the inner ring of the second bearing is in interference fit with the second paddle fan shaft and is positioned by a shaft shoulder, the outer ring of the second bearing and the second bearing seat are positioned by an elastic gasket,
a second motor connected to and driving the second fan shaft to rotate to actuate the second fan blade to rotate at a second rotational speed,
a rotation speed sensor which comprises a semiconductor end arranged on the end cover of the second bearing seat and a plurality of magnetic suction sheets arranged on the second paddle fan shaft in the circumferential direction, wherein the semiconductor end faces the magnetic suction sheets to measure the second rotation speed, and the second rotation speed and the first rotation speed are in opposite directions and are constant in speed,
a second electronic governor connected to the second motor to adjust a rotational speed thereof,
the processing unit comprises a processing unit and a control unit,
a controller that sends first signals to the first and second electronic governors to adjust first and second rotational speeds,
and the storage unit stores data measured by the pressure sensor, the rotating speed sensor and the power meter, and comprises a RAM memory and an SD card.
2. The fan tester for measuring fan air data of claim 1, wherein the first and second electronic governors are each provided with a speed closed loop control to effect closed loop control of the first and second motor speeds based on a predetermined speed given by the controller.
3. The fan tester for measuring fan air data as claimed in claim 2, wherein the controller includes a ground remote controller which transmits a high frequency pulse signal to be received by a receiver installed on the fan tester, the receiver amplifies and demodulates the high frequency pulse signal to be transmitted to the first electronic governor and the second electronic governor, the first electronic governor and the second electronic governor adjust a duty ratio according to the received high frequency signal, the first electronic governor and the second electronic governor output a PWM signal to control the rotation speeds of the first motor and the second motor, the rotation speed sensor transmits the collected rotation speed signal in the form of a voltage pulse signal to the AD converter to be converted into a digital signal and transmits the digital signal to the DSP system to perform collection and storage of the rotation speed signal, the power meter measures an input power signal of the first motor and stores the digital signal to the RAM and the SD card through the AD converter and the DSP system, the resistance film in the pressure sensor senses the resistance value generated by stress, a voltage signal value of the resistance value is measured and amplified by a power amplifier to form a 0-3V voltage signal, the voltage signal is converted into a digital signal by an AD converter on a DSP system, and the digital signal is stored in an RAM for transfer and then stored in an SD card.
4. The paddle fan tester for measuring paddle fan airborne data of claim 1,
the left end of the first motor is provided with a first accessory box fixed by an accessory box support, the first accessory box is provided with a receiver, a common 12V lithium battery, a first large-capacity model airplane lithium battery, a first electronic speed regulator, a power meter, a power amplifier, a DSP system, an AD converter, an RAM memory and an SD card, the right end of the second motor is provided with a second accessory box fixed by the accessory box support, and the second accessory box is provided with a second large-capacity model airplane lithium battery and a second electronic speed regulator.
5. The paddle fan tester for measuring paddle fan airborne data of claim 1, wherein the first paddle fan blade is engaged with a splined shaft end of a first paddle fan shaft through a partially splined hole of a hub thereof, the first paddle fan shaft is connected with the first motor through a first coupling, the second paddle fan blade is engaged with a splined shaft end of a second paddle fan shaft through a partially splined hole of a hub thereof, and the second paddle fan shaft is connected with the second motor through a second coupling.
6. The paddle fan tester for measuring paddle fan airborne data of claim 1, wherein the first motor is clamped by a first motor mount upper cover and a first motor mount lower cover and the second motor is clamped by a second motor mount upper cover and a second motor mount lower cover.
7. The paddle fan tester for measuring paddle fan airborne data of claim 1, wherein all components of the paddle fan tester have a cross-sectional diameter in the circumferential direction that is no greater than the diameter of the first or second paddle fan hub.
8. The paddle fan tester for measuring paddle fan airborne data of claim 1, wherein the first paddle fan blade and the second paddle fan blade are each scaled paddle models tested.
9. The paddle fan tester for measuring paddle fan airborne data of claim 3, wherein the DSP system receives the second signal of the controller via the radio frequency module to control data acquisition.
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