CN218916623U - Auxiliary device for improving torque testing precision of hydraulic dynamometer - Google Patents
Auxiliary device for improving torque testing precision of hydraulic dynamometer Download PDFInfo
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- CN218916623U CN218916623U CN202223592458.XU CN202223592458U CN218916623U CN 218916623 U CN218916623 U CN 218916623U CN 202223592458 U CN202223592458 U CN 202223592458U CN 218916623 U CN218916623 U CN 218916623U
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Abstract
The utility model relates to the technical field of hydraulic power meters, in particular to an auxiliary device for improving the torque testing precision of a hydraulic power meter, which comprises a force measuring arm assembly and a pre-tightening arm assembly, wherein the force measuring arm assembly is connected between one side of a shell assembly of the hydraulic power meter and a supporting seat, the pre-tightening arm assembly is connected between the other side of the shell assembly and the supporting seat, the force measuring arm assembly is provided with a tension pressure sensor, and the pre-tightening arm assembly is provided with an elastic energy storage piece and a length adjusting piece, and can enable the elastic energy storage piece to exert pre-tightening force on the shell assembly through the length adjusting piece. The auxiliary device can adjust the tension in the deformation range of the tension spring through the pre-tightening arm assembly, so that the installation damping size of the tension pressure sensor can be adjusted, the adjustment of the nut adjusting force is adjusted through screwing, the operation is convenient, the sensitivity is finely adjusted, and the follow-up calibration precision is higher.
Description
Technical Field
The utility model relates to the technical field of hydraulic dynamometers, in particular to an auxiliary device for improving torque testing precision of a hydraulic dynamometer.
Background
With the autonomous development of high-power heavy-duty gas turbines and aeroengines, various tests such as product performance development, calibration, matching, simulation, reliability and durability performance and the like are required to be carried out, and a power performance test of the engine is simulated on a test bed through a power loading device.
Because of the advantages of low unit cost, compact size, small inertia, rapid transient response, large absorption load and high-power operation of the hydraulic dynamometer, the hydraulic dynamometer is always an important device for measuring and diagnosing the power performance of a heavy-duty gas turbine and an aeroengine.
When the hydraulic dynamometer measures the power of the prime motor, the rotor rotates along with the prime motor, water entering the dynamometer is stirred, torque is transmitted to the stator and the shell by the water, the stator shell is driven to rotate at a small angle relative to the dynamometer base, the movement trend of the stator and the shell is prevented by the tension and compression sensor assembly, the tension and compression force is measured by the tension and compression sensor, and the power of the prime motor can be obtained by combining the length of a moment arm and the rotating speed.
The hydraulic dynamometer generally adopts a force sensor to measure force or torque, and the installation and connection mechanical structure of the force sensor has more or less damping, so that a special calibration mechanism is required to calibrate the damping, and the measurement accuracy of the force or torque of the dynamometer is ensured. In the traditional method, weight calibration or oil pressure calibration is adopted, no matter what calibration method is adopted, calibration is completed by measuring more groups of data for comparison, but the more the compared numerical value difference is irregular, the larger the calibration error is, the calibration precision is low, and an auxiliary device capable of reducing the error is also absent in the prior art.
Disclosure of Invention
In order to solve the technical problems in the background technology, the utility model provides an auxiliary device for improving the torque testing precision of a hydraulic dynamometer.
The utility model provides an auxiliary device for improving the torque testing precision of a hydraulic dynamometer, which comprises a force measuring arm assembly and a pre-tightening arm assembly, wherein the force measuring arm assembly is connected between one side of a shell assembly of the hydraulic dynamometer and a supporting seat, the pre-tightening arm assembly is connected between the other side of the shell assembly and the supporting seat, the force measuring arm assembly is provided with a tension pressure sensor, the pre-tightening arm assembly is provided with an elastic energy storage piece and a length adjusting piece, and the length of the elastic energy storage piece can be adjusted through the length adjusting piece so that the elastic energy storage piece can exert pre-tightening force on the shell assembly.
Preferably, the force measuring arm assembly comprises a brake arm, an upper connecting screw and a lower connecting screw, the brake arm is fixedly connected to the outer wall of the shell assembly, the upper end of the tension pressure sensor is connected with an upper knuckle bearing through the upper connecting screw, the upper knuckle bearing is hinged with one end of the brake arm, the lower end of the tension pressure sensor is connected with a lower knuckle bearing through the lower connecting screw, and the lower knuckle bearing is hinged on the supporting seat.
Preferably, the elastic energy storage element of the pre-tightening arm assembly is a tension spring.
Preferably, the length adjusting piece of the pre-tightening arm assembly comprises a mounting plate, a bearing plate, a guide seat and a guide rod, wherein the mounting plate is fixedly connected to the outer wall of the shell assembly, the bearing plate and the guide seat are sequentially fixed to the mounting plate from top to bottom, the guide rod is slidably mounted on the guide seat, the upper end of the guide rod is fixedly connected with a force adjusting bolt, and the upper end of the force adjusting bolt penetrates through the bearing plate and is in threaded connection with an adjusting nut.
Preferably, the tension spring is connected between the lower end of the guide rod and the supporting seat through the hook.
According to the auxiliary device for improving the torque testing precision of the hydraulic dynamometer, the tension force can be adjusted in the deformation range of the tension spring through the pre-tightening arm assembly, so that the installation damping size of the tension pressure sensor can be adjusted, the adjusting force of the nut is adjusted through screwing, the operation is convenient, the sensitivity is fine-adjusted, and the subsequent calibration precision is higher.
Drawings
FIG. 1 is a front view of a hydraulic dynamometer in an embodiment;
FIG. 2 is a right side view of the hydraulic dynamometer of the embodiment;
FIG. 3 is a schematic view of the internal structure of the hydraulic dynamometer according to the embodiment;
FIG. 4 is a schematic view of the force measuring arm assembly and the pretensioning arm assembly of the calibration apparatus of the embodiment mounted on a hydraulic dynamometer;
FIG. 5 is a schematic view of the pretensioning arm assembly of the calibration apparatus of FIG. 4;
FIG. 6 is a schematic view of a force arm assembly and calibration arm assembly of the calibration device of the embodiment mounted on a hydraulic dynamometer;
FIG. 7 is a schematic view of the calibration arm assembly of the calibration device of FIG. 6.
Detailed Description
Referring to fig. 1-6, an embodiment of the present utility model provides a hydraulic dynamometer, which includes a support assembly 100, a housing assembly 200, a stator assembly 300, a rotor assembly 400, a water intake valve assembly 500, a water discharge valve assembly 600, and a calibration device 700. Wherein:
the housing assembly 200 is mounted on the stand assembly 100 by a swing bearing, and the housing assembly 200 is capable of swinging on the stand assembly 100 around a horizontal axis; the stator assembly 300 and the rotor assembly 400 are installed in the housing assembly 200, and two ends of a rotating shaft 410 of the rotor assembly 400 penetrate through the housing assembly 200 along the swing axial direction of the housing assembly 200; the shell assembly 200 is provided with a water inlet and a water outlet, the water inlet valve assembly 500 is connected with the water inlet, and the water discharge valve assembly 600 is connected with the water outlet; calibration device 700 is mounted on support assembly 100 and is coupled to both sides of housing assembly 200 for measuring torque of housing assembly 200.
The working principle of the hydraulic dynamometer is as follows: the rotating shaft of the rotor assembly 400 is connected with the engine to be tested, the rotor assembly 400 is driven to rotate when the engine is started, water flows into the inner cavity of the shell assembly 200 through the water inlet, the rotor assembly 400 drives the water to swing towards the inner wall of the shell assembly 200 under the action of centrifugal force, and the shell assembly 200 swings under the impact of the water. The water impacts the inner wall of the shell assembly, the friction resistance of the inner wall reduces the speed, kinetic energy is paid, the absorbed mechanical energy is changed into heat energy, and finally the temperature of the water is increased. Because the swing speed of the housing assembly 200 is slower than the rotation speed of the rotor assembly 400 due to the friction between the water and the inner wall, the water is required to prevent the rotor assembly 400 from rotating to generate a resisting moment, the resisting moment directly acts on the engine through the rotor assembly 400 to form the load of the engine, or the water absorbs the power of the engine, the load can be controlled by adjusting the water inlet and outlet amount, therefore, the hydraulic dynamometer can be used for measuring the output torque or the driving torque of the engine, and then the output power or the driving power of the engine can be calculated by matching with the measured rotation speed of the rotor assembly 400.
Referring to fig. 4-6, an exemplary calibration device 700 according to the present utility model includes a force arm assembly 710, a calibration arm assembly 730, and a pre-tension arm assembly 720, wherein the force arm assembly 710 is mounted on one side of the housing assembly 200, and the calibration arm assembly 730 and the pre-tension arm assembly 720 are mounted on the other side of the housing assembly 200. Wherein, the force arm assembly 710 is provided with a pull pressure sensor 712 for measuring the torque applied to the housing assembly 200; the calibration arm assembly 730 comprises a force sensor 731 and an energy storage force adjusting piece, and the magnitude of static calibration pulling force or pressure applied to the shell assembly 200 by the calibration arm assembly 730 can be adjusted through the energy storage force adjusting piece; the pretension arm assembly 720 includes an elastic energy storage member and a length adjustment member, and the length adjustment member can adjust the length of the elastic energy storage member to enable the elastic energy storage member to apply pretension to the housing assembly 200.
Specifically, the force measuring arm assembly 710 includes a brake arm 711, a pull pressure sensor 712, an upper coupling screw 713, and a lower coupling screw 714, where the brake arm 711 is fixed on the outer wall of the housing assembly 200, the upper end of the pull pressure sensor 712 is connected with an upper knuckle bearing 715 through the upper coupling screw 713, the upper knuckle bearing 715 is hinged with one end of the brake arm 711, the lower end of the pull pressure sensor 712 is connected with a lower knuckle bearing 716 through the lower coupling screw 714, and the lower knuckle bearing 716 is hinged on the support assembly 100.
The energy storage force adjuster of the calibration arm assembly 730 comprises a calibration arm 732, a force transfer rod 733, an upper adjusting nut 734, an upper belleville spring set 735, a lower adjusting nut 736 and a lower belleville spring set 737, wherein the calibration arm 732 is fixedly connected to the outer wall of the shell assembly 200, the force transfer rod 733 vertically penetrates through the calibration arm 732, the upper adjusting nut 734 is in threaded connection with the upper end of the force transfer rod 733, the upper belleville spring set 735 is sleeved on the force transfer rod 733 and is located between the upper adjusting nut 734 and the calibration arm 732, the lower adjusting nut 736 is in threaded connection with the lower end of the force transfer rod 733, the lower belleville spring set 737 is sleeved on the force transfer rod 733 and is located between the lower adjusting nut 736 and the calibration arm 732, the lower end of the force transfer rod 733 is fixedly connected with the force sensor 731, and the force sensor 731 is hinged to the support assembly 100 through a joint bearing 738.
The length adjusting part of the pre-tightening arm assembly 720 comprises a mounting plate 721, a bearing plate 722, a guide seat 723 and a guide rod 724, the elastic energy storage part is a tension spring 725, the mounting plate 721 is fixed on the outer wall of the shell assembly 200, the bearing plate 722 and the guide seat 723 are sequentially fixed on the mounting plate 721 from top to bottom, the guide rod 724 is slidably mounted on the guide seat 723, the upper end of the guide rod 724 is fixedly connected with a force adjusting bolt, the upper end of the force adjusting bolt passes through the bearing plate 722 and is in threaded connection with an adjusting nut 726, and two ends of the tension spring 725 are connected between the lower end of the guide rod 724 and the support assembly 100 through hooks.
The calibration device 700 operates on the principle that: the pre-tightening arm assembly 720 can be used as an auxiliary device for improving the calibration precision of the calibration device 700, and when the calibration device is installed, the force measuring arm assembly 710 and the pre-tightening arm assembly 720 are installed first, and then the calibration arm assembly 730 is installed for calibration. After the force measuring arm assembly 710 and the pre-tightening arm assembly 720 are installed, the guide rod 724 can be adjusted to move on the guide seat 723 by screwing the adjusting nut 726, so that the tightness degree of the tension spring 725 is adjusted, the purpose of adjusting the pre-tightening tension of the tension spring 725 is achieved, the damping of the installation production of the force measuring arm assembly 710 on the shell assembly 200 can be adjusted, and the accuracy of subsequent calibration can be ensured. In the calibration process, by screwing the upper adjusting nut 734 or the lower adjusting nut 736 on the calibration arm assembly 730, the belleville spring can apply static calibration pressure or tension to the dowel bar 733, the magnitude of the static calibration force can be displayed through the force measuring sensor 731, the static calibration force is compared with the display value of the pull pressure sensor 712 on the force measuring arm assembly 710, and after a plurality of groups of data are measured, the pull pressure sensor 712 can be calibrated through a calibration program.
The calibration device 700 has a large torque range, can meet the test requirement of high-power high-speed rotating machinery, can realize stepless adjustment of static calibration force through the upper and lower adjusting nuts and the belleville springs of the calibration arm assembly 730, has a large adjusting range, is convenient to operate and control, has high fine adjustment sensitivity and accuracy, and is more beneficial to large torque calibration.
The foregoing is only a preferred embodiment of the present utility model, but the scope of the present utility model is not limited thereto, and any person skilled in the art, who is within the scope of the present utility model, should make equivalent substitutions or modifications according to the technical scheme of the present utility model and the inventive concept thereof, and should be covered by the scope of the present utility model.
Claims (5)
1. The utility model provides an improve auxiliary device of hydraulic dynamometer moment of torsion test accuracy, a serial communication port, including survey arm of force subassembly (710) and pretension arm subassembly (720), survey arm subassembly (710) are connected between shell assembly (200) one side and supporting seat (110) of hydraulic dynamometer, pretension arm subassembly (720) are connected between opposite side and supporting seat (110) of shell assembly (200), survey arm subassembly (710) are equipped with and draw pressure sensor (712), pretension arm subassembly (720) are equipped with elasticity energy storage piece and length adjustment piece, adjust the length through length adjustment piece and can make elasticity energy storage piece exert pretension to shell assembly (200).
2. The auxiliary device for improving torque testing precision of a hydraulic dynamometer according to claim 1, wherein the force measuring arm assembly (710) comprises a brake arm (711), an upper connecting screw (713) and a lower connecting screw (714), the brake arm (711) is fixedly connected to the outer wall of the housing assembly (200), the upper end of the pull pressure sensor (712) is connected with an upper knuckle bearing (715) through the upper connecting screw (713), the upper knuckle bearing (715) is hinged with one end of the brake arm (711), the lower end of the pull pressure sensor (712) is connected with a lower knuckle bearing (716) through the lower connecting screw (714), and the lower knuckle bearing (716) is hinged on the supporting seat (110).
3. The auxiliary device for improving the torque testing precision of the hydraulic dynamometer according to claim 1, wherein the elastic energy storage element of the pre-tightening arm assembly (720) is a tension spring (725).
4. An auxiliary device for improving torque testing accuracy of a hydraulic dynamometer according to claim 3, characterized in that the length adjusting part of the pre-tightening arm assembly (720) comprises a mounting plate (721), a bearing plate (722), a guide seat (723) and a guide rod (724), the mounting plate (721) is fixedly connected to the outer wall of the shell assembly (200), the bearing plate (722) and the guide seat (723) are sequentially fixed to the mounting plate (721) from top to bottom, the guide rod (724) is slidably mounted on the guide seat (723), a force adjusting bolt is fixedly connected to the upper end of the guide rod (724), and the upper end of the force adjusting bolt penetrates through the bearing plate (722) and is in threaded connection with an adjusting nut (726).
5. The auxiliary device for improving the torque testing precision of the hydraulic dynamometer according to claim 4, wherein the tension spring (725) is connected between the lower end of the guide rod (724) and the supporting seat (110) through a hook.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223592458.XU CN218916623U (en) | 2022-12-30 | 2022-12-30 | Auxiliary device for improving torque testing precision of hydraulic dynamometer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223592458.XU CN218916623U (en) | 2022-12-30 | 2022-12-30 | Auxiliary device for improving torque testing precision of hydraulic dynamometer |
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| Publication Number | Publication Date |
|---|---|
| CN218916623U true CN218916623U (en) | 2023-04-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223592458.XU Active CN218916623U (en) | 2022-12-30 | 2022-12-30 | Auxiliary device for improving torque testing precision of hydraulic dynamometer |
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| Country | Link |
|---|---|
| CN (1) | CN218916623U (en) |
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2022
- 2022-12-30 CN CN202223592458.XU patent/CN218916623U/en active Active
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