A ball bearing ring inner flow heat exchange experimental device and an inner flow heat exchange experimental method

Abstract

The application belongs to the technical field of bearing cooling and measurement, and particularly relates to a ball bearing ring inner flow heat exchange experimental device and an inner flow heat exchange experimental method. The device is characterized by an oil supply system, a heating and temperature measuring system and an oil return system. The device can independently heat the bearing ring with adjustable power, quantitatively obtain the steady-state temperature distribution of the bearing ring under different heating and oil supply conditions, evaluate the cooling effect and multi-working condition heat exchange characteristics of the inner flow channel of the ring, and conveniently replace the rings with different outer sizes and internal cooling flow channel structures by using detachable bolt connection. The device can analyze the heat exchange effect of different cooling structures, provide optimization suggestions for the internal cooling structure of the ring, and lay a theoretical foundation for the development of the outer ring independent cooling technology of large-size high-speed bearings.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of bearing cooling and measurement, and particularly relates to a heat exchange experiment device for a ball bearing ring and an internal flow heat exchange experiment method. BACKGROUND

[0002] Bearing is one of important parts in a mechanical transmission system, plays a role of supporting and positioning for a rotating part, reduces a friction coefficient in a running process of a mechanical system, and ensures rotation accuracy. When a high-speed ball bearing runs, a large amount of heat is generated due to friction between elements, and in order to protect the structure from overheating, lubricating oil needs to be supplied to cool it. With further improvement of bearing speed, especially for special requirements in the field of aerospace, the traditional cooling method gradually cannot meet the requirements, so the internal flow cooling technology for the bearing ring is developed, the traditional 'external flow cooling' is changed into 'internal forced cooling' by designing a flow channel in the ring, so as to realize the target of improving cooling efficiency, reducing bearing temperature field and reducing lubricating oil demand.

[0003] The external ring internal flow cooling technology is still in a large number of basic research stage, and the technical maturity is low, and there is no mature instrument to measure the heat exchange effect of the cooling structure in the outer ring, and there is a lack of evaluation of the heat exchange effect. SUMMARY

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

[0005] To achieve the above purpose, the technical scheme adopted by the application is as follows: a ball bearing ring heat exchange experiment device, comprising an oil supply system, a heating and temperature measuring system and an oil return system;

[0006] The oil supply system comprises an oil supply pipe, a flow sensor is communicated on the oil supply pipe, and an oil inlet pipe interface is arranged on the flow sensor; the heating and temperature measuring system comprises a rack, a bearing ring with an internal cooling flow channel is arranged on the rack, an annular heater is coaxially arranged in the bearing ring, and heat preservation material is mounted on the periphery of the annular heater; the bearing ring and the heat preservation material are installed on the support ring through a front ring pressing plate and a rear ring pressing plate, a temperature measuring sensor is installed on the bearing ring through a sensor pressing 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, and the oil outlet pipe is connected with an oil tank;

[0008] The temperature sensor and the pressure sensor are also arranged on the oil supply pipe, the oil supply pipe is fixedly installed on the heating and temperature measuring system through a fixing block, and the oil supply pipe is connected with the heating and temperature measuring system;

[0009] The lubricating oil entering through the oil inlet interface flows through the flow sensor, the temperature sensor and the pressure sensor in sequence for measuring the flow, temperature and pressure of the lubricating oil, and then is supplied to the oil supply interface through the oil supply pipe, and further enters the internal flow channel of the bearing ring. The temperature sensor measures the temperature of the outer wall surface 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] Further, the oil inlet interface is fixedly installed on the front ring pressing plate through an oil inlet pressing plate and first bolts, and the front ring pressing plate is fixedly connected with the support ring of the stand through second bolts. The front ring pressing plate is further provided with a fastening pressing plate which is fixed to the ring pressing plate through third bolts. The bearing ring is provided with a semicircular frame on the periphery, and a glass ring is arranged between the bearing ring and the annular heater.

[0011] The semicircular frame comprises upper and lower semicircular frames which are fastened by detachable nuts. The sensor pressing block is composed of upper and lower parts which are fixedly installed on the semicircular frame through fifth bolts. The temperature sensor is fixed on the sensor pressing block through fourth bolts.

[0012] Further, the heat preservation material comprises inner and outer half heat preservation materials which are symmetrically installed and have the same shape, and the inner and outer half heat preservation materials realize positioning and heat preservation of the bearing ring. The oil outlet interface is fixedly installed on the rear ring pressing plate through an oil outlet pressing plate and sixth bolts.

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

[0014] Further, the oil tank is fixed on the stand through an oil tank connecting plate, and the oil tank is provided with an oil return pipe at the bottom. The oil outlet pipe is fixedly installed on the heating and temperature measuring system through a pipe fixing block, and the end of the oil outlet pipe is further provided with a nut joint connected with the oil return pump. The oil outlet pipe is connected with the heating and temperature measuring system.

[0015] Further, the oil inlet interface and the oil outlet interface have the same structure, and the inner diameter of the oil inlet interface and the oil outlet interface is 4.8 mm. The outer diameter of the oil inlet interface and the oil outlet interface matched with the oil inlet hole of the bearing ring is 5.5 mm. The outer wall surface of the oil inlet interface and the oil outlet interface has two circular ring protrusions with the maximum diameter of 14 mm and the minimum diameter of 8 mm. The oil inlet pressing plate is concave-shaped, and the concave part has a width of 8.2 mm. The oil inlet pressing plate is matched with the middle part of the oil inlet interface. The oil inlet interface is sleeved with the oil supply pipe at one end and with the bearing ring at the other end.

[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 provided in the sensor pressing block for matching and installing the temperature sensors (2-11). The temperature sensors are in contact with the bearing ring. Eight sensor pressing blocks are evenly distributed circumferentially around the bearing ring, and four temperature sensors (2-11) are evenly distributed axially 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 the thermal radiation of the annular heater. The power range of the annular heater 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 support 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 values, use a ring heater with a heating power of 500W to heat the lubricating oil, and use a temperature sensor to measure the temperature of the outer wall 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. The heat exchange test is then continued with the heating power of 1500W and 2000W under the predetermined oil 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 reduced to 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 ball bearing ring heat exchange experiment device and the inner flow heat exchange experiment method have the following technical effects: the ball bearing ring heat exchange experiment device and the inner flow heat exchange experiment method can independently heat the bearing ring with adjustable power, can quantitatively obtain the steady-state temperature distribution of the experimental bearing ring under different heating and oil supply conditions (oil supply temperature and oil supply amount), and can evaluate the cooling effect and the multi-working condition heat exchange characteristics of the inner flow channel of the experimental ring; meanwhile, the ball bearing ring heat exchange experiment device adopts bolt connection which is easy to disassemble, can conveniently replace the outer size ring with different inner cooling flow channel structures, can analyze the heat exchange effect of different cooling structures, can provide optimization suggestions for the inner cooling structure of the ring, and can lay a theoretical foundation for the development of the outer ring independent cooling technology of the large-size high-speed bearing. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 It is a schematic structural diagram of an oil supply system of the application;

[0027] Figure 2 It is a schematic structural diagram of a heating and temperature measuring system of the application from the front view;

[0028] Figure 3 It is a schematic structural diagram of a heating and temperature measuring system of the application from the sectional view;

[0029] Figure 4 It is a schematic structural diagram of an oil return system of the application;

[0030] Figure 5 It is a schematic structural diagram of an oil inlet interface and an oil inlet pressing plate of the application;

[0031] Figure 6 It is a schematic structural diagram of a heating pipe of the application;

[0032] Figure 7 It is a schematic structural diagram of a heat insulation material of the application;

[0033] Figure 8 It is a schematic structural diagram of a bearing ring experiment device of the application;

[0034] Figure 9 It is a schematic structural diagram of a temperature sensor and a sensor pressing block of the application.

[0035] In the figure: 1-1, oil inlet pipe interface; 1-2, flow sensor; 1-3, temperature sensor; 1-4, pressure sensor; 1-5, fixed block; 1-6, oil supply pipe; 2-1, oil inlet interface; 2-2, oil inlet pressing plate; 2-3, first bolt; 2-4, front collar pressing plate; 2-5, second bolt; 2-6, bearing collar; 2-7, annular heater; 2-7-1, effective heating section of annular heater; 2-7-2, first annular heater electrical connector; 2-7-3, second annular heater electrical connector; 2-8, fastening pressing plate; 2-9, third bolt; 2-10, sensor pressing block; 2-11, temperature sensor (2-11); 2-12, fourth bolt; 2-13, fifth bolt; 2-14, detachable nut; 2-15, semicircular bracket; 2-16, rack; 2-16-1, base; 2-16-2, side support plate; 2-16-3, support inclined plate; 2-16-4, support ring; 2-17, heat preservation material; 2-17-1, inner half heat preservation material; 2-17-2, outer half heat preservation material; 2-18, glass ring; 2-19, oil outlet pressing plate; 2-20, oil outlet interface; 2-21, sixth bolt; 2-22, rear collar pressing plate; 3-1, oil outlet pipe; 3-2, oil tank; 3-3, oil tank connecting plate; 3-4, oil return pipe; 3-5, pipe fixing block; 3-6, nut connector connected with oil return pump. DETAILED DESCRIPTION

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

[0037] In order to achieve the above-mentioned purpose, the present application provides the following specific embodiments:

[0038] Embodiment 1: a ball bearing collar heat exchange experimental device, comprising an oil supply system, a heating and temperature measuring system and an oil return system;

[0039] The oil supply system comprises an oil supply pipe 1-6, and a flow sensor 1-2 is communicated on the oil supply pipe 1-6, and an oil inlet pipe interface 1-1 is arranged on the flow sensor 1-2; A temperature sensor 1-3 and a pressure sensor 1-4 are further arranged on the oil supply pipe 1-6, the oil supply pipe 1-6 is fixedly installed on the heating and temperature measuring system through a fixed block 1-5, and the oil supply pipe 1-6 is connected with the heating and temperature measuring system;

[0040] The heating temperature measuring system comprises a rack 2-16, a bearing ring 2-6 with an internal cooling channel is arranged on the rack 2-16, a ring-shaped heater 2-7 is coaxially arranged in the bearing ring 2-6, and a heat preservation material 2-17 is mounted on the periphery of the ring-shaped heater 2-7; the bearing ring 2-6 and the heat preservation material 2-17 are mounted on a supporting ring 2-16-4 through a front ring pressing plate 2-4 and a rear ring pressing plate 2-22, a temperature measuring sensor 2-11 is mounted on the bearing ring 2-6 through a sensor pressing block 2-10, and an oil inlet interface 2-1 and an oil outlet interface 2-20 are further mounted corresponding to the cooling channel of the bearing ring 2-6.

[0041] The oil inlet interface 2-1 is fixedly mounted on the front ring pressing plate 2-4 through an oil inlet pressing plate 2-2 and a first bolt 2-3, the front ring pressing plate 2-4 is fixedly connected with the supporting ring 2-16-4 of the rack 2-16 through a second bolt 2-5, a fastening pressing plate 2-8 is further arranged on the front ring pressing plate 2-4, the fastening pressing plate 2-8 is fixed to the ring pressing plate through a third bolt 2-9, a semicircular frame 2-15 is arranged on the periphery of the bearing ring 2-6, and a glass ring 2-18 is arranged between the bearing ring 2-6 and the ring-shaped heater 2-7.

[0042] The semicircular frame 2-15 comprises upper and lower semicircular frames 2-15, the upper and lower semicircular frames 2-15 are fastened through detachable nuts 2-14, the sensor pressing block 2-10 is composed of upper and lower parts, the sensor pressing block 2-10 is fixedly mounted on the semicircular frame 2-15 through a fifth bolt, and the temperature measuring sensor 2-11 is fixed to the sensor pressing block 2-10 through a fourth bolt.

[0043] The heat preservation material 2-17 comprises inner and outer half heat preservation materials 2-17-1 and 2-17-2, the oil outlet interface 2-20 is fixedly mounted on the rear ring pressing plate 2-22 through an oil outlet pressing plate 2-19 and a sixth bolt 2-21; the inner and outer half heat preservation materials 2-17-1 and 2-17-2 are the same in shape and are symmetrically mounted, and the inner and outer half heat preservation materials 2-17-1 and 2-17-2 realize positioning and heat preservation of the bearing ring 2-6.

[0044] The ring-shaped heater 2-7 comprises a ring-shaped heater effective heating section 2-7-1, a first ring-shaped heater electric connector 2-7-2 and a second ring-shaped heater electric connector 2-7-3, the diameter of the ring-shaped heater 2-7 is 18 mm, and the effective heating angle a of the ring-shaped heater effective heating section 2-7-1 is 350 degrees.

[0045] The oil inlet interface 2-1 and the oil outlet interface 2-20 are structurally identical, 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 oil inlet interface 2-1 and the oil outlet interface 2-20 and the oil inlet hole matching section of the bearing ring 2-6 is 5.5 mm, the outer wall surface of the oil inlet interface 2-1 and the oil outlet interface 2-20 has two circular ring protrusion structures, the maximum diameter is 14 mm, and the minimum diameter is 8 mm; the oil inlet pressure plate 2-2 is concave downward, the concave width is 8.2 mm, and the oil inlet pressure plate 2-2 is matched with the middle section of the oil inlet interface 2-1; one end of the oil inlet interface 2-1 is sleeved in the oil supply pipe, and the other end of the oil inlet interface 2-1 is sleeved in the bearing ring 2-6.

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

[0047] The sensor pressing block 2-10 is composed of two parts, the sensor pressing block 2-10 is internally provided with four cylindrical through holes matched with the temperature measuring sensors 2-11, the temperature measuring sensors 2-11 are in contact with the bearing ring 2-6, the sensor pressing block 2-10 is uniformly distributed around the bearing ring 2-6, there are eight sensor pressing blocks 2-10, each sensor pressing block 2-10 is axially distributed with four temperature measuring sensors 2-11, and there are a total of 32 temperature measuring sensors 2-11.

[0048] The annular heater 2-7 adopts electric heating, the annular heater 2-7 is used for non-contact heating of the bearing ring 2-6, heat is transmitted through the heat radiation of the annular heater 2-7, the power range of the annular heater 2-7 is 0-5000 W, and the adjustment accuracy is 1 W.

[0049] The rack 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 through screws and a support inclined plate 2-16-3, and a support ring 2-16-4 is fixedly installed on the upper end of the side support plate 2-16-2 through screws.

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

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

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

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

[0054] The installation method of the heating temperature measurement system of the application is as follows: first, the rack 2-16 is installed on the test bench, the inner ring pressing plate 2-22 is sleeved on the rack 2-16, the inner half heat preservation material 2-17-1 is sleeved on the rack 2-16, the heating pipe 2-7, the glass ring 2-18, the outer half heat preservation material 2-17-2 and the ring test piece 2-6 are sequentially sleeved, the front ring pressing plate 2-4 is installed and bolted to the rack 2-16, the oil inlet interface 2-1 is bolted to the front ring pressing plate 2-4 after being matched with the oil inlet pressing plate 2-2, the oil outlet interface 2-20 is bolted to the rear ring pressing plate 2-22 after being matched with the oil outlet pressing plate 2-19, the upper and lower semicircular racks 2-15 are installed on the rack, the sensor 2-11 is installed on the sensor pressing block 2-10 and then bolted to the semicircular rack 2-15 through the bolt 2-13, so that the sensor 2-11 is tightly attached to the outer wall surface of the ring 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, thereby completing the installation of the entire experimental device.

[0055] The flow path of the lubricating oil in the experimental device is as follows: the lubricating oil flows from the external oil tank with a temperature control system to the oil inlet pipe interface 1-1 of the oil supply system of the experimental device, flows through the flow sensor 1-2, the temperature sensor 1-3 and the pressure sensor 1-4, respectively, is supplied to the oil inlet interface 2-1 of the heating temperature measurement system through the oil supply pipe 1-6, 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 oil return system, and finally is pumped back to the external oil tank by the external oil pump.

[0056] Embodiment 2: The application also provides an internal flow heat exchange experimental method of the ball bearing ring heat exchange experimental device, which comprises the following steps:

[0057] Step one: the lubricating oil with a supply oil flow of 0-3 L / min and a supply oil temperature of 40-70℃ is supplied to the internal flow channel of the bearing ring through the oil supply pipe and the oil inlet pipe interface;

[0058] Step two, after the oil temperature and flow rate in the inner flow channel of the bearing ring reach the predetermined value, the annular heater is used to heat the lubricating oil with a heating power of 500 W, the temperature sensor is used to measure the temperature of the outer wall surface of the bearing ring, until the average change amplitude of each temperature measuring sensor measuring point of the bearing ring is less than 0.1℃, which represents that the heat exchange is stable, that is, the heat exchange experiment with a heating power of 500 W is completed;

[0059] Step three, after the heat exchange experiment with a heating power of 500 W is stable, the heating power of the annular heater is increased to 1000 W, and then the heat exchange experiments with a heating power of 1500 W and 2000 W are respectively completed under the predetermined oil flow rate and temperature conditions;

[0060] Step four, after the heat exchange experiments under different heating powers are completed, the heating power of the annular heater is adjusted to 0, the heating is stopped, the oil supply is continued until the measuring points of the outer wall surface of the bearing ring are all lower than 100℃, the oil supply is stopped, the oil return is stopped until there is no oil accumulation in the oil return tank, the power supply is turned off, and the experiment is completed.

[0061] The above only describes the preferred embodiments of the present application, and is not used to limit the present application, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

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 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 heating and temperature measurement system includes a stand (2-16), a bearing ring (2-6) with an internal cooling channel is provided on the stand (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 of the annular heater (2-7). 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 pressure plate (2-4) and a rear ring pressure plate (2-22); a temperature sensor (2-11) is installed on the bearing ring (2-6) via a sensor pressure 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), which is connected to an 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). 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 sequentially through a flow sensor (1-2), a temperature sensor (1-3) and a pressure sensor (1-4) for measuring the flow rate, temperature and pressure of the lubricating oil, 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 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 the oil inlet pressure plate (2-2) and the first bolt (2-3); the front ferrule pressure plate (2-4) is fixedly connected to the support ring (2-16-4) of the stand (2-16) via the second bolt (2-5); a fastening pressure plate (2-8) is further provided on the front ferrule pressure plate (2-4); the fastening pressure plate (2-8) is fixed to the ferrule pressure plate via the 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) includes an upper semicircular frame and a lower semicircular frame (2-15), which are fastened by easily detachable nuts (2-14). The sensor pressing block (2-10) consists of 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 sensor (2-11) is fixed to 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) includes 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) achieve 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 to the bench (2-16) via an oil tank connecting plate (3-3); an oil return pipe (3-4) is provided 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) for connecting to an oil return pump is further provided 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 2, 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 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 with a maximum diameter of 14 mm and a minimum diameter of 8 mm; the oil inlet pressure plate (2-2) is concave in shape, with a concave width of 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 on the oil supply pipe, and the other end of the oil inlet interface (2-1) is internally sleeved on 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 provided in the sensor pressing block (2-10) for matching and installing the temperature sensors (2-11). The temperature sensors (2-11) are in contact with the bearing ring (2-6). Eight sensor pressing blocks (2-10) are evenly distributed circumferentially around the bearing ring (2-6). Four temperature sensors (2-11) are evenly distributed axially in each sensor pressing block (2-10), for a total of 32 temperature sensors (2-11).

8. The ball bearing ring heat exchange tester according to claim 1, characterized in that: The annular heater (2-7) adopts electric heating, and the annular heater (2-7) heats the bearing ring (2-6) in a non-contact manner, and 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. The ball bearing ring heat exchange tester according to claim 1, characterized in that: 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 support inclined plate (2-16-3), and the support ring (2-16-4) is fixedly installed 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 according to any one of claims 1 to 9, characterized in that: The steps include: Step 1: Lubricating oil is supplied to the internal flow passage 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 temperature and flow rate in the internal flow channel of the bearing ring (2-6) reach predetermined values, the lubricating oil is heated using the annular heater (2-7) at a heating power of 500W, and the outer wall temperature of the bearing ring (2-6) is measured using the temperature sensor (2-11) until the average change amplitude of the measuring points of the temperature sensors (2-11) uniformly 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 500W 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 is continued with the heating power of 1500W and 2000W under the predetermined oil flow rate and temperature conditions respectively; 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, and the test is over.

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