Device for measuring output torque of air heat engine

Abstract

The invention belongs to the technical field of measuring devices, and discloses an air heat engine output torque measuring device which comprises a base, a strain type torque measuring instrument is installed on the base, a support-free bamboo joint pipe and a signal access line are installed on the strain type torque measuring instrument, a lantern ring is connected to the end of the support-free bamboo joint pipe, and the signal access line is connected to the lantern ring. The lantern ring is rotatably provided with a conductive slip ring, the output end of the conductive slip ring is connected with the signal access line, the input end of the conductive slip ring is connected with a strain gauge, the end part of the conductive slip ring is rotatably provided with a threaded sleeve, the threaded sleeve is in threaded connection with a mounting cylinder, and the mounting cylinder is symmetrically provided with two positioning ports. The two positioning openings are communicated with an avoiding opening, the two positioning openings are formed in the mounting cylinder at an angle of 45 degrees, the positioning openings are matched with the strain gauges (7) in specification and size, and an expansion sleeve is mounted at the end of the mounting cylinder, the strain gauges can be rapidly and symmetrically arranged on the two sides of the rotating shaft at the angle of 45 degrees, and the measurement efficiency is guaranteed.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of measuring devices, and particularly relates to an air heat engine output torque measuring device. BACKGROUND

[0002] The air heat engine is a heat engine using air as a working medium, which converts heat energy into mechanical energy through the circulation process of heating and cooling air.

[0003] In the field of thermal power machinery, the output torque measurement of the air heat engine is a key link for evaluating energy conversion efficiency. At present, the output torque measurement of the air heat engine (such as the Stirling engine) mainly relies on two types of technologies: one is indirect conversion through a mechanical torque sensor, which is easily affected by the friction loss of the transmission mechanism, and the error rate is more than ±5%; the other is non-contact optical measurement, which avoids mechanical interference but is high in cost and requires complex calibration.

[0004] The strain type torque sensor measurement is more accurate than the above two measurement methods, but the strain measurement method has the problem of difficult measurement efficiency because the installation angle of the strain gauge needs to be limited. When the shaft is subjected to torque, pure shear stress state is generated on the surface of the shaft. According to the principle of material mechanics, the maximum shear stress direction is at an angle of 45° with the axis. At this time, the principal strain (tension / compression strain) in this direction is linearly related to the torque, and the torque size can be directly reflected by measuring the strain in the 45° direction. When it is not 45°, measurement errors will occur. However, it is difficult to manually determine 45° on the shaft, so it is currently difficult to measure torque by using strain gauges. SUMMARY

[0005] In view of the problems in the above background art, the purpose of the present application is to provide an air heat engine output torque measuring device.

[0006] To achieve the above technical purpose, the technical scheme adopted by the present application is as follows:

[0007] An air heat engine output torque measuring device, comprising a base, wherein the base is provided with a strain type torque measuring instrument, and the strain type torque measuring instrument is provided with a support-free bamboo joint pipe and a signal access line.

[0008] The end of the support-free bamboo tube is connected to a collar, a conductive slip ring is rotatably mounted on the collar, an output end of the conductive slip ring is connected to the signal access line, an input end of the conductive slip ring is connected to a strain gauge, a threaded sleeve is rotatably mounted on the end of the conductive slip ring, the threaded sleeve is threadedly connected to a mounting tube, the mounting tube is symmetrically provided with two positioning ports, the positioning ports are connected to an avoidance port, the two positioning ports are arranged on the mounting tube at an angle of 45°, the positioning ports match the specifications of the strain gauge (7), and a tightening sleeve is mounted on the end of the mounting tube.

[0009] It is further defined that the strain-type torque meter is the HS-3000 strain-type torque meter. This design can be purchased directly, so its usage can be clearly obtained.

[0010] It is further defined that the support-free bamboo tube can be detachably mounted on the collar. This design facilitates replacement of the bamboo tube when it fails.

[0011] It is further defined that a bearing is installed between the conductive ring slip ring and the threaded sleeve. Such a design ensures the mutual rotation effect between the two.

[0012] It is further defined that the length of the connecting wire between the strain gauge and the conductive slip ring is one centimeter longer than the distance between the bottom of the positioning port and the conductive slip ring. With this design, the connecting wire will not be too tight and will not be easily entangled or interfered with.

[0013] It is further defined that the strain-type torque measuring instrument is equipped with a handle, and such a design facilitates the extraction and movement of the strain-type torque measuring instrument.

[0014] It is further defined that the positioning port is deburred, and such a design can prevent interference with the accurate pasting of the angle of the strain gauge.

[0015] The beneficial effects of the present invention are as follows:

[0016] The present invention uses strain gauges to perform torque testing, which has high accuracy;

[0017] The measuring device of the present invention does not require keyway processing on the rotating shaft and will not damage the rotating shaft.

[0018] The present invention can quickly and symmetrically arrange strain gauges on both sides of the rotating shaft in a 45° manner to ensure measurement efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention can be further illustrated by the non-limiting examples given in the accompanying drawings;

[0020] Figure 1 This is a schematic structural diagram of an embodiment of an air heat engine output torque measurement device of the present invention;

[0021] Figure 2 This is a schematic cross-sectional view of an embodiment of an air heat engine output torque measuring device according to the present invention;

[0022] Figure 3 This is a schematic diagram of the mounting cylinder structure of an embodiment of an air heat engine output torque measurement device of the present invention;

[0023] Figure 4 This is a schematic diagram for measuring air heat engine;

[0024] The main component symbols are described as follows:

[0025] Base 1; strain-type torque measuring instrument 2; support-free bamboo tube 3; signal access line 4; collar 5; conductive slip ring 6; strain gauge 7; threaded sleeve 8; mounting tube 9; positioning port 10; avoidance port 11; expansion sleeve 12; bearing 13; handle 14. DETAILED DESCRIPTION

[0026] In order to enable those skilled in the art to better understand the present invention, the technical solution of the present invention is further described below with reference to the accompanying drawings and embodiments.

[0027] like Figures 1 to 4 As shown, an air heat engine output torque measuring device of the present invention comprises a base 1, a strain type torque measuring instrument 2 is installed on the base 1, and the strain type torque measuring instrument 2 is installed with a support-free bamboo tube 3 and a signal access line 4;

[0028] The end of the support-free bamboo tube 3 is connected to a ring 5, and a conductive slip ring 6 is rotatably installed on the ring 5. The output end of the conductive slip ring 6 is connected to the signal access line 4, and the input end of the conductive slip ring 6 is connected to a strain gauge 7. The end of the conductive slip ring 6 is rotatably installed with a threaded sleeve 8, and the threaded sleeve 8 is threadedly connected to a mounting tube 9. The mounting tube 9 is symmetrically provided with two positioning ports 10, and the positioning ports 10 are connected to an avoidance port 11. The two positioning ports 10 are set at an angle of 45° to the mounting tube 9. The positioning ports 10 match the specifications and dimensions of the strain gauge 7. A tightening sleeve 12 is installed on the end of the mounting tube 9.

[0029] The preferred strain-type torque measuring instrument 2 is the HS-3000 strain-type torque measuring instrument. This design can be purchased directly, so its usage can be clearly obtained. In fact, the specification and model of the strain-type torque measuring instrument 2 that can be used can also be selected according to the specific situation.

[0030] Preferably, the support-free bamboo tube 3 can be detachably mounted on the collar 5. This design facilitates replacement of the bamboo tube 3 when it fails. In fact, the installation and connection method of the support-free bamboo tube 3 can also be considered according to specific circumstances.

[0031] Preferably, a bearing 13 is installed between the conductive ring slip ring 6 and the threaded sleeve 8. This design ensures the mutual rotation effect between the two. In fact, the selection of the bearing 13 or measures to ensure the rotation effect between the two can also be considered according to specific circumstances.

[0032] It is preferred that the length of the connecting wire between the strain gauge 7 and the conductive slip ring 6 is one centimeter longer than the distance between the bottom of the positioning hole 10 and the conductive slip ring 6. With this design, the connecting wire will not be too tight and will not be easily entangled or interfered with. In fact, the length of the connecting wire between the strain gauge 7 and the conductive slip ring 6 can also be considered according to specific circumstances.

[0033] The strain-type torque measuring instrument 2 is preferably equipped with a handle 14 . This design facilitates the extraction and movement of the strain-type torque measuring instrument 2 . In fact, the installation position and number of the handles 14 may also be considered according to specific circumstances.

[0034] It is preferred that the positioning opening 10 be deburred. This design can prevent interference with the accurate angle pasting of the strain gauge 7. In fact, measures to prevent angle interference of the positioning opening 10 can also be considered according to specific circumstances.

[0035] In this embodiment, when using an air heat engine output torque measuring device, the rotating shaft of the air heat engine to be measured is first polished. If it is rusted, it is necessary to polish out the metallic luster position, and then wipe it with cotton wool until there is no obvious stain on the new cotton wool used for wiping. Then, the expansion sleeve 12 and the mounting cylinder 9 are sleeved on the rotating shaft, and the expansion sleeve 8 is locked until the mounting cylinder 9 is completely coaxially fixed on the rotating shaft. Then, a thin layer of adhesive is applied to the measuring surface of the strain gauge 7, and the positioning hole 10 is pressed directly downward on the rotating shaft. , smooth it so that the circumference of the strain gauge 7 contacts the edge of the positioning hole 10 without warping, until the strain gauge 7 is tightly adhered, spray the curing glue into the positioning hole 10. The setting of the positioning hole 10 makes the adhesive have strong adhesion. After curing, install the strain gauge 7 in the positioning hole 10 on the other side in the same way, screw the threaded sleeve 8 on the installation cylinder 8, and start to cooperate with the strain type torque measuring instrument 2 to test the output torque of the air heat engine. Under the effect of the positioning hole 10, the drift of the strain gauge 7 can be prevented to ensure the measurement effect;

[0036] During the test, the shaft drives the strain gauge 7 to rotate, and a pure shear stress state is generated on its surface to achieve the purpose of testing torque. The conductive slip ring 6 is set to rotate with it, so that the signal access line 4 does not bend, and the support-free bamboo tube 3 provides auxiliary support for the conductive slip ring 6;

[0037] After the test is completed, the positioning port 10 can be cleaned and used again for the next time, thus achieving the purpose of recycling.

[0038] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical principles disclosed herein are intended to be covered by the claims of the present invention.

Claims

1. An air heat engine output torque measuring device, comprising a base (1), wherein the base (1) is equipped with a strain type torque measuring instrument (2), characterized in that: The strain-type torque measuring instrument (2) is equipped with a support-free bamboo tube (3) and a signal access line (4); The end of the support-free bamboo tube (3) is connected with a collar (5), and a conductive slip ring (6) is rotatably installed on the collar (5). The output end of the conductive slip ring (6) is connected to the signal access line (4), and the input end of the conductive slip ring (6) is connected with a strain gauge (7). The end of the conductive slip ring (6) is rotatably installed with a threaded sleeve (8), and the threaded sleeve (8) is threadedly connected to a mounting tube (9). The mounting tube (9) is symmetrically provided with two positioning ports (10), and the positioning ports (10) are connected to an avoidance port (11). The two positioning ports (10) are arranged on the mounting tube (9) at an angle of 45°. The positioning ports (10) match the specifications and dimensions of the strain gauge (7). A tightening sleeve (12) is installed at the end of the mounting tube (9).

2. The device for measuring the output torque of an air heat engine according to claim 1, characterized in that: The strain-type moment measuring instrument (2) is an HS-3000 strain-type moment measuring instrument.

3. The device for measuring the output torque of an air heat engine according to claim 2, characterized in that: The support-free bamboo tube (3) is detachably mounted on the sleeve ring (5).

4. The device for measuring the output torque of an air heat engine according to claim 3, characterized in that: A bearing (13) is installed between the conductive ring slip ring (6) and the threaded sleeve (8).

5. The device for measuring the output torque of an air heat engine according to claim 4, characterized in that: The length of the connecting line between the strain gauge (7) and the conductive slip ring (6) is one centimeter longer than the distance between the bottom of the positioning opening (10) and the conductive slip ring (6).

6. The device for measuring the output torque of an air heat engine according to claim 5, characterized in that: The strain-type moment measuring instrument (2) is equipped with a handle (14).

7. The device for measuring the output torque of an air heat engine according to claim 6, characterized in that: The positioning opening (10) is deburred.

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