Ball bearing ring internal flow heat exchange experimental apparatus and internal flow heat exchange experimental method

Abstract

The invention belongs to the technical field of bearing cooling and measurement, and particularly relates to a ball bearing ring internal flow heat exchange experimental apparatus and an internal flow heat exchange experimental method. The device is characterized by comprising an oil supply system, a heating temperature measurement system and an oil return system, the device realizes independent power-adjustable heating of the bearing ring, can quantitatively obtain the steady-state temperature distribution of the outer bearing ring of an experimental piece under different heating and oil supply conditions, and evaluates the cooling effect and multi-working-condition heat exchange characteristics of an internal flow channel of the outer bearing ring of the experimental piece; meanwhile, the ball bearing ring heat exchange tester adopts easy-to-disassemble bolt connection, so that rings with different external sizes of internal cooling flow channel structures can be conveniently replaced, heat exchange effect analysis is carried out on different cooling structures, optimization suggestions are provided for the internal cooling structures of the rings, and a theoretical foundation is laid for the development of an independent cooling technology of an outer ring of a large-size high-speed bearing.

Description

Technical Field

[0001] The invention belongs to the technical field of bearing cooling and measurement, and in particular is a heat exchange experiment device for a ball bearing ring and an internal flow heat exchange experiment method. Background Art

[0002] Bearings are one of the important parts in mechanical transmission systems. They support and position rotating parts, reduce the friction coefficient during the operation of the mechanical system, and ensure the rotation accuracy. When high-speed ball bearings are running, a large amount of heat will be generated due to the friction between the components. In order to ensure that the structure does not overheat, lubricating oil needs to be supplied to cool it. As the speed of the bearings increases further, especially for the special needs of the aerospace field, traditional cooling methods are gradually unable to meet the requirements. Therefore, internal flow cooling technology for bearing rings is developed. By designing flow channels inside the rings, the traditional "external flow cooling" is transformed into "internal flow forced cooling", thereby achieving the goal of improving cooling efficiency, reducing the bearing temperature field and reducing lubricating oil demand.

[0003] The outer ring internal flow cooling technology is still in the stage of extensive basic research, and the technical maturity is relatively low. There is currently no mature instrument to measure the heat transfer effect of the cooling structure inside the outer ring, and there is an even greater lack of evaluation of the heat transfer effect. Summary of the invention

[0004] The purpose of the present invention is to avoid the shortcomings of the prior art and provide a ball bearing ring internal flow heat exchange tester to solve the technical problem that the cooling effect of the unconventional cooling device of the bearing ring cannot be measured.

[0005] To achieve the above object, the technical solution adopted by the present invention is: a ball bearing ring heat exchange tester, including an oil supply system, a heating and temperature measurement system and an oil return system;

[0006] The oil supply system includes an oil supply pipe, the oil supply pipe is connected to a flow sensor, and an oil inlet pipe interface is arranged on the flow sensor; the heating and temperature measuring system includes a bench, a bearing ring with an internal cooling channel is arranged on the bench, an annular heater is coaxially arranged inside the bearing ring, and a heat preservation material is installed on the periphery of the annular heater; the bearing ring and the heat preservation material are installed on the support ring through the front ring pressure plate and the rear ring pressure plate, a temperature measuring sensor is installed on the bearing ring through the sensor pressure block, and an oil inlet interface and an oil outlet interface are also installed corresponding to the cooling channel of the bearing ring;

[0007] The oil return system comprises an oil outlet pipe connected to the oil tank;

[0008] The oil supply pipe is also provided with a temperature sensor and a pressure sensor. The oil supply pipe is fixedly mounted on the heating and temperature measuring system through a fixing block. The oil supply pipe is connected to the heating and temperature measuring system.

[0009] The lubricating oil entering from the oil inlet pipe interface flows through the flow sensor, temperature sensor and pressure sensor used to measure the lubricating oil flow, temperature and pressure in sequence, and is supplied to the oil inlet interface through the oil supply pipe, and then enters the internal flow channel of the bearing ring. The temperature sensor measures the temperature of the outer wall of the bearing ring. Then the lubricating oil flows out of the bearing ring to the oil outlet interface and flows into the oil tank through the oil outlet pipe of the oil return system.

[0010] Furthermore, the oil inlet interface is fixedly mounted on the front ferrule pressing plate through the oil inlet pressing plate and the first bolt, the front ferrule pressing plate is fixedly connected to the support ring of the stand through the second bolt, the front ferrule pressing plate is also provided with a fastening pressing plate, the fastening pressing plate is fixed to the ferrule pressing plate through the third bolt, a semicircular frame is provided on the periphery of the bearing ferrule, and a glass ring is provided between the bearing ferrule and the annular heater;

[0011] The semicircular frame includes an upper and a lower semicircular frame, which are fastened by easily detachable nuts. The sensor pressing block consists of an upper and a lower part, which is fixedly mounted on the semicircular frame by a fifth bolt, and the temperature sensor is fixed on the sensor pressing block by a fourth bolt.

[0012] Furthermore, the thermal insulation material includes an inner half thermal insulation material and an outer half thermal insulation material, and the oil outlet interface is fixedly mounted on the rear ring pressure plate via an oil outlet pressure plate and a sixth bolt; the inner half thermal insulation material and the outer half thermal insulation material have the same shape and are symmetrically mounted, and the inner half thermal insulation material and the outer half thermal insulation material realize the positioning and insulation of the bearing ring.

[0013] Furthermore, the annular heater comprises an annular heater effective heating section, a first annular heater electrical connector and a second annular heater electrical connector. The diameter of the annular heater is 18 mm, and the effective heating angle α of the annular heater effective heating section is 350 degrees.

[0014] Furthermore, the oil tank is fixed on the test bench through an oil tank connecting plate, an oil return pipe is arranged at the bottom of the oil tank, the oil outlet pipe is fixedly installed on the heating and temperature measuring system through a pipeline fixing block, and a nut joint connected to an oil return pump is also arranged at the end of the oil outlet pipe, and the oil outlet pipe is connected to the heating and temperature measuring system.

[0015] Furthermore, the oil inlet interface and the oil outlet interface have the same structure, the inner diameter of the oil inlet interface and the oil outlet interface is 4.8mm, the outer diameter of the oil inlet interface and the oil outlet interface and the oil inlet hole of the bearing ring is 5.5mm, and the outer wall of the oil inlet interface and the oil outlet interface has two sections of annular protrusion structures, with a maximum diameter of 14mm and a minimum diameter of 8mm; the oil inlet pressure plate is concave in shape, the width of the concave is 8.2mm, and the oil inlet pressure plate matches the middle section of the oil inlet interface; one end of the oil inlet interface is internally sleeved in the oil supply pipe, and the other end of the oil inlet interface is internally sleeved in the bearing ring;

[0016] The bearing ring is designed with a flow channel inside, with an outer diameter of 200 mm and an inner diameter of 177.5 mm.

[0017] Furthermore, the sensor pressing block is composed of two parts, and four cylindrical through holes are arranged in the sensor pressing block, which are matched with the temperature sensors (2-11) for installation. The temperature sensors are in contact with the bearing ring. Eight sensor pressing blocks are evenly distributed in the circumference of the bearing ring, and four temperature sensors (2-11) are evenly distributed in the axial direction in each sensor pressing block, for a total of 32 temperature sensors.

[0018] Furthermore, the annular heater adopts electric heating, and the annular heater heats the bearing ring in a non-contact manner, and transfers heat through thermal radiation of the annular heater. The power range of the annular heating tube is 0-5000W, and the adjustment accuracy is 1W.

[0019] Furthermore, the stand includes a base and side support plates, the base and the side support plates are fixedly connected by screws and supporting inclined plates, and the support ring is fixedly installed on the upper end of the side support plates by screws.

[0020] The present invention also provides an internal flow heat exchange test method of the ball bearing ring heat exchange tester, comprising the following steps:

[0021] Step 1: Lubricating oil is supplied to the internal flow channel of the bearing ring through the oil supply pipe and the oil inlet pipe interface;

[0022] Step 2: After the oil temperature and flow rate in the internal flow channel of the bearing ring reach the predetermined value, use the annular heater to heat the lubricating oil with a heating power of 500W, and use the temperature sensor to measure the outer wall temperature of the bearing ring until the average change amplitude of each temperature sensor measuring point evenly distributed around the bearing ring is less than 0.1°C, indicating that the heat exchange under working conditions is stable, that is, the heat exchange experiment with a heating power of 500W is completed;

[0023] Step 3: After the heat exchange is stable under the heat exchange test condition with a heating power of 500W, the heating power of the annular heater is increased to 1000W, and the heat exchange test with the heating power of 1500W and 2000W is continued under the predetermined oil supply flow and temperature conditions;

[0024] Step 4. After the heat exchange test under different heating powers is completed, adjust the heating power of the annular heater to 0, stop heating, continue to supply oil until the measuring points on the outer wall of the tested bearing ring are all lower than 100 degrees Celsius, stop supplying oil, wait until there is no lubricating oil accumulated in the return oil tank, stop returning oil, turn off the power, and the test is over.

[0025] Compared with the prior art, the present invention has the following technical effects: the ball bearing ring heat exchange tester and the internal flow heat exchange test method can realize power-adjustable heating of the bearing ring alone, and can quantitatively obtain the steady-state temperature distribution of the outer ring of the experimental piece bearing under different heating and oil supply conditions (oil supply temperature and oil supply amount), and evaluate the cooling effect of the internal flow channel of the experimental piece ring and the multi-operating condition heat exchange characteristics; at the same time, the ball bearing ring heat exchange tester adopts easy-to-detach bolt connection, which can conveniently replace the outer size of the ring with different internal cooling flow channel structures, analyze the heat exchange effect of different cooling structures, and put forward optimization suggestions for the internal cooling structure of the ring, laying a theoretical foundation for the development of separate cooling technology for the outer ring of large-size high-speed bearings. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the structure of the oil supply system of the present invention;

[0027] Figure 2 It is a schematic diagram of the main structure of the heating and temperature measuring system of the present invention;

[0028] Figure 3 It is a schematic cross-sectional structure diagram of the heating and temperature measuring system of the present invention;

[0029] Figure 4 It is a schematic diagram of the structure of the oil return system of the present invention;

[0030] Figure 5 It is a schematic diagram of the oil inlet interface and the oil inlet pressure plate structure of the present invention;

[0031] Figure 6 It is a schematic diagram of the heating tube structure of the present invention;

[0032] Figure 7 It is a schematic diagram of the structure of the heat insulation material of the present invention;

[0033] Figure 8 It is a schematic diagram of the structure of the bearing outer ring tester of the present invention;

[0034] Fig. 9 It is a schematic diagram of the structure of the temperature sensor and the sensor pressing block of the present invention.

[0035] In the figure: 1-1, oil inlet pipe interface; 1-2, flow sensor; 1-3, temperature sensor; 1-4, pressure sensor; 1-5, fixing block; 1-6, oil supply pipe; 2-1, oil inlet interface; 2-2, oil inlet pressure plate; 2-3, first bolt; 2-4, front ring pressure plate; 2-5, second bolt; 2-6, bearing ring; 2-7, annular heater; 2-7-1, annular heater effective heating section; 2-7-2, first annular heater electrical connector; 2-7-3, second annular heater electrical connector; 2-8, fastening pressure plate; 2-9, third bolt; 2-10, sensor pressure block; 2-11, temperature sensor (2-11); 2-12, fourth bolt Bolt; 2-13, the fifth bolt; 2-14, the easily removable nut; 2-15, the semicircular frame; 2-16, the stand; 2-16-1, the base; 2-16-2, the side support plate; 2-16-3, the supporting inclined plate; 2-16-4, the supporting ring; 2-17, the thermal insulation material; 2-17-1, the inner half thermal insulation material; 2-17-2, the outer half thermal insulation material; 2-18, the glass ring; 2-19, the oil outlet pressure plate; 2-20, the oil outlet interface; 2-21, the sixth bolt; 2-22, the rear ring pressure plate; 3-1, the oil outlet pipe; 3-2, the oil tank; 3-3, the oil tank connecting plate; 3-4, the oil return pipe; 3-5, the pipeline fixing block; 3-6, the nut joint for connecting the oil return pump. DETAILED DESCRIPTION

[0036] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0037] In order to achieve the above object, the present invention provides the following specific implementation methods:

[0038] Embodiment 1: A ball bearing ring heat exchange tester, comprising an oil supply system, a heating and temperature measurement system and an oil return system;

[0039] The oil supply system includes an oil supply pipe 1-6, the oil supply pipe 1-6 is connected to a flow sensor 1-2, and the flow sensor 1-2 is provided with an oil inlet pipe interface 1-1; the oil supply pipe 1-6 is also provided with a temperature sensor 1-3 and a pressure sensor 1-4, and the oil supply pipe 1-6 is fixedly installed on the heating and temperature measuring system through a fixing block 1-5, and the oil supply pipe 1-6 is connected to the heating and temperature measuring system;

[0040] The heating and temperature measuring system includes a stand 2-16, on which a bearing ring 2-6 with an internal cooling channel is arranged, a ring heater 2-7 is coaxially arranged inside the bearing ring 2-6, and a heat-insulating material 2-17 is installed on the periphery of the ring heater 2-7; the bearing ring 2-6 and the heat-insulating material 2-17 are installed on the support ring 2-16-4 through the front ring pressure plate 2-4 and the rear ring pressure plate 2-22, a temperature measuring sensor 2-11 is installed on the bearing ring 2-6 through the sensor pressure block 2-10, and an oil inlet interface 2-1 and an oil outlet interface 2-20 are also installed corresponding to the cooling channel of the bearing ring 2-6;

[0041] The oil inlet interface 2-1 is fixedly installed on the front ring pressure plate 2-4 through the oil inlet pressure plate 2-2 and the first bolt 2-3. The front ring pressure plate 2-4 is fixedly connected to the support ring 2-16-4 of the stand 2-16 through the second bolt 2-5. A fastening pressure plate 2-8 is also provided on the front ring pressure plate 2-4. The fastening pressure plate 2-8 is fixed to the ring pressure plate through the third bolt 2-9. A semicircular frame 2-15 is provided on the periphery of the bearing ring 2-6. A glass ring 2-18 is provided between the bearing ring 2-6 and the annular heater 2-7.

[0042] The semicircular frame 2-15 includes an upper semicircular frame 2-15 and a lower semicircular frame 2-15, which are fastened by an easily removable nut 2-14. The sensor pressing block 2-10 is composed of an upper and a lower part. The sensor pressing block 2-10 is fixedly installed on the semicircular frame 2-15 by a fifth bolt, and the temperature sensor (2-11) is fixed on the sensor pressing block 2-10 by a fourth bolt.

[0043] The insulation material 2-17 includes an inner half insulation material 2-17-1 and an outer half insulation material 2-17-2. The oil outlet interface 2-20 is fixedly mounted on the rear ring pressure plate 2-22 through the oil outlet pressure plate 2-19 and the sixth bolt 2-21. The inner half insulation material 2-17-1 and the outer half insulation material 2-17-2 have the same shape and are symmetrically installed. The inner half insulation material 2-17-1 and the outer half insulation material 2-17-2 realize the positioning and insulation of the bearing ring 2-6.

[0044] The annular heater 2-7 includes an annular heater effective heating section 2-7-1, a first annular heater electrical connector 2-7 and a second annular heater electrical connector 2-7-3. The diameter of the annular heater 2-7 is 18 mm, and the effective heating angle α of the annular heater effective heating section 2-7-1 is 350 degrees.

[0045] The oil inlet interface 2-1 and the oil outlet interface 2-20 have the same structure, the inner diameter of the oil inlet interface 2-1 and the oil outlet interface 2-20 is 4.8mm, the outer diameter of the oil inlet interface 2-1 and the oil outlet interface 2-20 and the oil inlet hole of the bearing ring 2-6 is 5.5mm, and the outer wall of the oil inlet interface 2-1 and the oil outlet interface 2-20 has two sections of annular protrusion structures, with a maximum diameter of 14mm and a minimum diameter of 8mm; the oil inlet pressure plate 2-2 is concave, and the width of the concave part is 8.2mm. The oil inlet pressure plate 2-2 matches the middle section of the oil inlet interface 2-1; one end of the oil inlet interface 2-1 is internally sleeved in the oil supply pipe, and the other end of the oil inlet interface 2-1 is internally sleeved in the bearing ring 2-6;

[0046] The bearing ring 2-6 is designed with a flow channel inside, with an outer diameter of 200 mm and an inner diameter of 177.5 mm.

[0047] The sensor block 2-10 consists of two parts. Four cylindrical through holes are arranged in the sensor block 2-10 to match the temperature sensor 2-11. The temperature sensor 2-11 is in contact with the bearing ring 2-6. There are 8 sensor blocks 2-10 evenly distributed around the bearing ring 2-6. There are 4 temperature sensors 2-11 evenly distributed axially in each sensor block 2-10, for a total of 32 temperature sensors 2-11.

[0048] The annular heater 2-7 adopts electric heating. The annular heater 2-7 heats the bearing ring 2-6 in a non-contact manner and transfers heat through the thermal radiation of the annular heater 2-7. The power range of the annular heating tube is 0-5000W, and the adjustment accuracy is 1W.

[0049] The stand 2-16 includes a base 2-16-1 and a side support plate 2-16-2. The base 2-16-1 and the side support plate 2-16-2 are fixedly connected by screws and a supporting inclined plate 2-16-3. The support ring 2-16-4 is fixedly installed on the upper end of the side support plate 2-16-2 by screws.

[0050] The oil supply system has an oil flow range of 0-3L / min and an oil supply temperature range of 40-70°C.

[0051] The oil return system includes an oil outlet pipe 3-1, and the oil outlet pipe 3-1 is connected to the oil tank 3-2;

[0052] The oil tank 3-2 is fixed on the stand 2-16 through the oil tank connecting plate 3-3, a return oil pipe 3-4 is arranged at the bottom of the oil tank 3-2, the oil outlet pipe 3-1 is fixedly installed on the heating and temperature measuring system through the pipe fixing block 3-5, and a nut joint 3-6 connected to the return oil pump is also arranged at the end of the oil outlet pipe 3-1, and the oil outlet pipe 3-1 is connected to the heating and temperature measuring system.

[0053] The lubricating oil entering from the oil inlet pipe interface 1-1 flows through the flow sensor 1-2, temperature sensor 1-3 and pressure sensor 1-4 for measuring the flow, temperature and pressure of the lubricating oil in sequence, and is supplied to the oil inlet interface 2-1 through the oil supply pipe 1-6, and then enters the internal flow channel of the bearing ring 2-6. The temperature sensor 2-11 measures the temperature of the lubricating oil in the internal flow channel. Then the lubricating oil flows out from the bearing ring 2-6 to the oil outlet interface 2-20, and flows into the oil tank 3-2 through the oil outlet pipe 3-1 of the oil return system.

[0054] The heating and temperature measuring system of the present invention is installed as follows: first, the bench 2-16 is installed on the test bench, the inner ring pressure plate 2-22 is put on the bench 2-16, the inner semi-insulating material 2-17-1 is put on the bench 2-16, and the heating tube 2-7, the glass ring 2-18, the outer semi-insulating material 2-17-2, and the ring test piece 2-6 are put on in sequence, the front ring pressure plate 2-4 is installed and bolted to the bench 2-16, and the oil inlet interface 2- 1 is fixed to the front ferrule pressure plate 2-4 with bolts after cooperating with the oil inlet pressure plate 2-2, and the oil outlet interface 2-20 is fixed to the rear ferrule pressure plate 2-22 with bolts 2-21 after cooperating with the oil outlet pressure plate 2-19. The upper and lower semicircular frames 2-15 are installed on the bench. The sensor 2-11 is installed on the sensor pressure block 2-10 and then installed on the semicircular frame 2-15 with bolts 2-13, so that the sensor 2-11 is tightly attached to the outer wall of the ferrule test piece 2-6. Finally, the oil supply pipe 1-6 of the oil supply system is connected to the oil inlet interface 2-1, and the oil outlet pipe 3-1 of the oil return system is connected to the oil outlet interface 2-20, and the installation of the entire experimenter is completed.

[0055] The flow path of the lubricating oil in the experimenter is as follows: first, it flows from the external large oil tank with a temperature control system to the oil inlet pipe interface 1-1 of the oil supply system of the experimenter, flows through the flow sensor 1-2, the temperature sensor 1-3, and the pressure sensor 1-4 respectively, and is supplied to the oil inlet interface 2-1 of the heating and temperature measuring system through the oil supply pipe 1-6. The lubricating oil enters the internal flow channel of the bearing ring 2-6, flows out of the bearing ring 2-6 to the oil outlet interface 2-20, flows into the oil tank 3-2 through the oil outlet pipe 3-1 of the return oil system, and is finally pumped back to the large oil tank by the external oil pump.

[0056] Embodiment 2: The present invention also provides an internal flow heat exchange test method of the ball bearing ring heat exchange tester, comprising the following steps:

[0057] Step 1: Use the lubricating oil with an oil supply flow rate of 0-3L / min and an oil supply temperature of 40-70°C to supply oil to the internal flow channel of the bearing ring through the oil supply pipe and the oil inlet pipe interface;

[0058] Step 2: After the oil temperature and flow rate in the internal flow channel of the bearing ring reach the predetermined value, use the annular heater to heat the lubricating oil with a heating power of 500W, and use the temperature sensor to measure the outer wall temperature of the bearing ring until the average change amplitude of each temperature sensor measuring point evenly distributed around the bearing ring is less than 0.1°C, indicating that the heat exchange under working conditions is stable, that is, the heat exchange experiment with a heating power of 500W is completed;

[0059] Step 3: After the heat exchange is stable under the heat exchange test condition with a heating power of 500W, the heating power of the annular heater is increased to 1000W, and the heat exchange test with the heating power of 1500W and 2000W is continued under the predetermined oil supply flow and temperature conditions;

[0060] Step 4. After the heat exchange test under different heating powers is completed, adjust the heating power of the annular heater to 0, stop heating, continue to supply oil until the measuring points on the outer wall of the tested bearing ring are all lower than 100 degrees Celsius, stop supplying oil, wait until there is no lubricating oil accumulated in the return oil tank, stop returning oil, turn off the power, and the test is over.

[0061] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A ball bearing ring heat exchange tester, characterized in that: Including oil supply system, heating and temperature measurement system and oil return system; The oil supply system comprises an oil supply pipe (1-6), the oil supply pipe (1-6) is connected to a flow sensor (1-2), and the flow sensor (1-2) is provided with an oil inlet pipe interface (1-1); the heating and temperature measurement system comprises a bench (2-16), a bearing ring (2-6) with an internal cooling channel is provided on the bench (2-16), an annular heater (2-7) is coaxially provided inside the bearing ring (2-6), and the annular heater (2-7) is provided on the periphery A heat-insulating material (2-17) is installed; the bearing ring (2-6) and the heat-insulating material (2-17) are installed on the support ring (2-16-4) via a front ring pressing plate (2-4) and a rear ring pressing plate (2-22); a temperature sensor (2-11) is installed on the bearing ring (2-6) via a sensor pressing block (2-10); and an oil inlet interface (2-1) and an oil outlet interface (2-20) are also installed in the cooling channel corresponding to the bearing ring (2-6); The oil return system comprises an oil outlet pipe (3-1), and the oil outlet pipe (3-1) is connected to the oil tank (3-2); The oil supply pipe (1-6) is also provided with a temperature sensor (1-3) and a pressure sensor (1-4); the oil supply pipe (1-6) is fixedly mounted on the heating and temperature measuring system via a fixing block (1-5); and the oil supply pipe (1-6) is connected to the heating and temperature measuring system; The lubricating oil entering through the oil inlet pipe interface (1-1) flows through a flow sensor (1-2), a temperature sensor (1-3) and a pressure sensor (1-4) for measuring the flow, temperature and pressure of the lubricating oil in sequence, and is supplied to the oil inlet interface (2-1) through the oil supply pipe (1-6), and then enters the internal flow channel of the bearing ring (2-6), and the temperature sensor (2-11) measures the temperature of the outer wall surface of the bearing ring (2-6). Then, the lubricating oil flows out of the bearing ring (2-6) to the oil outlet interface (2-20), and flows into the oil tank (3-2) through the oil outlet pipe (3-1) of the oil return system.

2. A ball bearing ring heat exchange tester as claimed in claim 1, characterized in that: The oil inlet interface (2-1) is fixedly mounted on the front ferrule pressure plate (2-4) via an oil inlet pressure plate (2-2) and a first bolt (2-3); the front ferrule pressure plate (2-4) is fixedly connected to a support ring (2-16-4) of a stand (2-16) via a second bolt (2-5); a fastening pressure plate (2-8) is also provided on the front ferrule pressure plate (2-4); the fastening pressure plate (2-8) is fixed to the ferrule pressure plate via a third bolt (2-9); a semicircular frame (2-15) is provided on the periphery of the bearing ferrule (2-6); and a glass ring (2-18) is provided between the bearing ferrule (2-6) and the annular heater (2-7); The semicircular frame (2-15) comprises an upper semicircular frame (2-15) and a lower semicircular frame (2-15), the upper semicircular frame (2-15) and the lower semicircular frame (2-15) are fastened by an easily detachable nut (2-14), the sensor pressing block (2-10) comprises an upper and a lower part, the sensor pressing block (2-10) is fixedly mounted on the semicircular frame (2-15) by a fifth bolt, and the temperature measuring sensor (2-11) is fixed on the sensor pressing block (2-10) by a fourth bolt.

3. A ball bearing ring heat exchange tester as claimed in claim 1, characterized in that: The thermal insulation material (2-17) comprises an inner half thermal insulation material (2-17-1) and an outer half thermal insulation material (2-17-2); the oil outlet interface (2-20) is fixedly mounted on the rear ring pressure plate (2-22) via an oil outlet pressure plate (2-19) and a sixth bolt (2-21); the inner half thermal insulation material (2-17-1) and the outer half thermal insulation material (2-17-2) have the same shape and are symmetrically mounted; the inner half thermal insulation material (2-17-1) and the outer half thermal insulation material (2-17-2) realize positioning and thermal insulation of the bearing ring (2-6).

4. A ball bearing ring heat exchange tester as claimed in claim 1, characterized in that: The annular heater (2-7) comprises an annular heater effective heating section (2-7-1), a first annular heater electrical connector (2-7) and a second annular heater electrical connector (2-7-3); the annular heater (2-7) has a diameter of 18 mm, and an effective heating angle α of the annular heater effective heating section (2-7-1) is 350 degrees.

5. A ball bearing ring heat exchange tester as claimed in claim 1, characterized in that: The oil tank (3-2) is fixed on the bench (2-16) via an oil tank connecting plate (3-3); an oil return pipe (3-4) is arranged at the bottom of the oil tank (3-2); the oil outlet pipe (3-1) is fixedly mounted on the heating and temperature measuring system via a pipe fixing block (3-5); a nut joint (3-6) connected to an oil return pump is also arranged at the end of the oil outlet pipe (3-1); and the oil outlet pipe (3-1) is connected to the heating and temperature measuring system.

6. A ball bearing ring heat exchange tester as claimed in claim 1, characterized in that: The oil inlet interface (2-1) and the oil outlet interface (2-20) have the same structure, the inner diameter of the oil inlet interface (2-1) and the oil outlet interface (2-20) is 4.8 mm, the outer diameter of the matching section of the oil inlet interface (2-1) and the oil outlet interface (2-20) and the oil inlet hole of the bearing ring (2-6) is 5.5 mm, and the outer wall surface of the oil inlet interface (2-1) and the oil outlet interface (2-20) has two sections of annular protrusion structures, the maximum diameter is 14 mm, and the minimum diameter is 8 mm; the oil inlet pressure plate (2-2) is concave in shape, the width of the concave part is 8.2 mm, and the oil inlet pressure plate (2-2) matches the middle section of the oil inlet interface (2-1); one end of the oil inlet interface (2-1) is internally sleeved in the oil supply pipe, and the other end of the oil inlet interface (2-1) is internally sleeved in the bearing ring (2-6); The bearing ring (2-6) is designed with a flow channel inside, with an outer diameter of 200 mm and an inner diameter of 177.5 mm.

7. A ball bearing ring heat exchange tester as claimed in claim 1, characterized in that: The sensor pressing block (2-10) is composed of two parts. Four cylindrical through holes are arranged in the sensor pressing block (2-10) and are matched with the temperature measuring sensors (2-11). The temperature measuring sensors (2-11) are in contact with the bearing ring (2-6). Eight sensor pressing blocks (2-10) are evenly distributed in the circumferential direction of the bearing ring (2-6). Four temperature measuring sensors (2-11) are evenly distributed in the axial direction in each sensor pressing block (2-10), and a total of 32 temperature measuring sensors (2-11) are arranged.

8. A ball bearing ring heat exchange tester as claimed in claim 1, characterized in that: The annular heater (2-7) adopts electric heating. The annular heater (2-7) heats the bearing ring (2-6) in a non-contact manner. Heat is transferred through the heat radiation of the annular heater (2-7). The power range of the annular heater is 0-5000W, and the adjustment accuracy is 1W.

9. A ball bearing ring heat exchange tester according to any one of claims 1 to 8, characterized in that: The stand (2-16) comprises a base (2-16-1) and a side support plate (2-16-2); the base (2-16-1) and the side support plate (2-16-2) are fixedly connected by screws and a support inclined plate (2-16-3); and the support ring (2-16-4) is fixedly mounted on the upper end of the side support plate (2-16-2) by screws.

10. An internal flow heat transfer test method of a ball bearing ring heat transfer tester as claimed in claims 1 to 9, characterized in that: The steps include: Step 1: Lubricating oil is supplied to the internal flow channel of the bearing ring (2-6) through the oil supply pipe (1-6) and the oil inlet pipe interface (1-1); Step 2: After the oil supply temperature and flow rate in the internal flow channel of the bearing ring (2-6) reach a predetermined value, the lubricating oil is heated using an annular heater (2-7) with a heating power of 500 W, and the outer wall temperature of the bearing ring (2-6) is measured using a temperature sensor (2-11) until the average change amplitude of the measuring points of the temperature sensors (2-11) evenly distributed around the bearing ring (2-6) is less than 0.1° C., indicating that the heat exchange under the working condition is stable, and the heat exchange experiment with a heating power of 500 W is completed; Step 3: After the heat exchange is stable under the heat exchange test condition with a heating power of 500W, the heating power of the annular heater (2-7) is increased to 1000W, and the heat exchange test with the heating power of 1500W and 2000W is continued under the predetermined oil supply flow and temperature conditions; Step 4. After the heat exchange test under different heating powers is completed, adjust the heating power of the annular heater (2-7) to 0, stop heating, continue to supply oil until the measuring points on the outer wall of the tested bearing ring (2-6) are all reduced to 100 degrees Celsius, stop supplying oil, wait until there is no lubricating oil accumulated in the return oil tank (3-2), stop returning oil, turn off the power supply, and the test is completed.

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