A sliding bearing test system for high-temperature molten salt pumps

Abstract

The utility model relates to a kind of sliding bearing test system for high-temperature molten salt pump, and the test system includes: support, molten salt tank, electric heat tracing, thermal insulation cotton, bearing testing device, high-temperature sealing pad, thermocouple, molten salt is contained in molten salt tank, electric heat tracing is wound outside molten salt tank;Bearing testing device is installed on molten salt tank, high-temperature sealing pad with the heat insulation effect of preventing molten salt vapor leakage is installed between bearing testing device and molten salt tank;Thermocouple is inserted into molten salt inside molten salt tank, and thermocouple is connected on the electric heat tracing control system outside.The utility model reproduces the key working condition parameters of bearing in real molten salt pump under laboratory environment.The utility model can quickly, accurately evaluate and compare the friction and wear performance and expected service life of different candidate bearing materials.The utility model provides scientific basis and data support for the component design and structure optimization of new bearing material by analyzing wear morphology and failure mechanism.

Description

Technical Field

[0001] This utility model relates to a testing system, specifically a testing system for sliding bearings used in high-temperature molten salt pumps that reproduces key operating parameters of bearings in real molten salt pumps under laboratory conditions. Background Technology

[0002] With the development of advanced technologies such as concentrated solar power (CSP), fourth-generation nuclear reactors (e.g., molten salt reactors), and high-temperature chemical engineering, molten salt, as an excellent heat transfer and energy storage medium, is increasingly widely used. High-temperature molten salt pumps are the core power equipment in these systems, undertaking the critical task of transporting high-temperature (typically 400°C to 800°C) and highly corrosive molten salts. Their reliability, stability, and long service life directly affect the safety and economy of the entire system.

[0003] In high-temperature molten salt pumps, sliding bearings are the core components supporting the rotation of the pump shaft, and their working environment is extremely harsh: High-temperature environment: When exposed to temperatures of several hundred degrees Celsius for a long time, conventional lubricating greases and oils will fail. In such cases, molten salt media or special solid materials are usually used for "self-lubrication" or "boundary lubrication".

[0004] Highly corrosive: Molten salts (such as nitrates, fluorides, chlorides, etc.) are highly corrosive to most metallic materials.

[0005] Complex loads: The bearings need to withstand the radial and axial loads of the pump shaft, impeller, etc., as well as the vibrations and impacts generated during operation.

[0006] Special lubrication conditions: When conventional lubricating oils cannot be used, the self-lubricating properties of the bearing material and the performance of the boundary lubrication film formed with molten salt are crucial.

[0007] These harsh conditions place extremely high demands on the comprehensive performance of sliding bearing materials (such as high-temperature strength, wear resistance, corrosion resistance, self-lubrication, and compatibility with molten salt). Bearing failure will lead to pump shutdown and even serious safety accidents. Therefore, developing long-life, high-reliability sliding bearing materials suitable for high-temperature molten salt conditions has become a technological bottleneck driving the development of related industries. Utility Model Content

[0008] To address the aforementioned problems, the main objective of this invention is to provide a high-temperature molten salt pump sliding bearing testing system that can reproduce the key operating parameters of bearings in a real molten salt pump under laboratory conditions.

[0009] This utility model solves the above-mentioned technical problems through the following technical solution: a sliding bearing testing system for a high-temperature molten salt pump, the high-temperature molten salt pump sliding bearing testing system comprising: a support, a molten salt tank, an electric heat tracing device, insulation cotton, a bearing testing device, a high-temperature sealing gasket, and a thermocouple. The molten salt tank is filled with molten salt, and the outside of the molten salt tank is wrapped with an electric heat tracing device, which is then wrapped with insulation cotton. The molten salt tank is placed on the support, and the bearing testing device is installed on the molten salt tank. A high-temperature sealing gasket is installed between the bearing testing device and the molten salt tank to prevent molten salt vapor leakage and to provide heat insulation. The thermocouple is inserted into the molten salt inside the molten salt tank and is connected to an external electric heat tracing control system.

[0010] In a specific embodiment of this utility model, the bearing testing device is detachably mounted on the molten salt tank using multiple bolts.

[0011] In a specific embodiment of this utility model, the bearing testing device includes: a variable frequency motor, a coupling assembly, a motor bracket, a round nut, a bearing assembly, a fan, a bracket, a sealing assembly, a shaft, a guide bearing seat, a guide shaft sleeve, a guide bearing, an eccentric block, and a pressure plate.

[0012] The guide bearing housing and the sealing assembly are welded to the bracket to form a whole. The sealing assembly is equipped with multi-disc high-temperature resistant packing to prevent molten salt vapor from leaking out along the shaft. An eccentric block of a certain weight is installed on one side of the pressure plate.

[0013] The guide bearing is mounted on the guide bearing housing by screws, and the guide bearing and the guide shaft sleeve form a friction pair.

[0014] The bracket is equipped with a bearing assembly, and the bearing assembly contains a ball bearing. A round nut is installed on the upper part of the bearing assembly, and the axial position of the guide sleeve is adjusted by adjusting the round nut.

[0015] A motor bracket is mounted on the support frame, and a variable frequency motor is mounted on the motor bracket. The variable frequency motor is connected to the shaft via a coupling assembly.

[0016] In a specific embodiment of this utility model, the bearing testing device insulation cotton is wrapped around the sealing component on the bracket.

[0017] In a specific embodiment of this utility model, the method for calculating the weight of the eccentric block is as follows: Where: r is the distance (m) between the eccentric block and the center of rotation, F is the radial force (N) to be simulated, and n is the motor speed (r / min).

[0018] In a specific embodiment of this utility model, a fan is mounted on the shaft, and the fan is located between the bearing assembly and the sealing assembly.

[0019] In a specific embodiment of this utility model, the molten salt tank is filled with molten salt, and the molten salt level submerges the lowest point of the guide bearing seat by more than 100mm.

[0020] In a specific embodiment of this utility model, a venting pipe connecting to the outside is provided on the bracket, and a venting valve is installed on the venting pipe.

[0021] The positive and progressive effects of this utility model are as follows: The high-temperature molten salt pump sliding bearing testing system provided by this utility model has the following advantages: 1. Reproduce the key operating parameters (temperature, speed, load) of the bearing in a real molten salt pump under laboratory conditions.

[0022] 2. It can quickly and accurately evaluate and compare the tribological properties and expected service life of different candidate bearing materials (such as special alloys, ceramics, metal matrix composites, etc.).

[0023] 3. By analyzing the wear morphology and failure mechanism, we can provide a scientific basis and data support for the composition design and structural optimization of new bearing materials. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0025] Figure 2 This is a schematic diagram of the bearing testing device in this utility model.

[0026] Figure 3 for Figure 2 A magnified view of a portion of the image.

[0027] The following are the names corresponding to the reference numerals in this utility model: In the diagram: 1. Support 2. Molten salt tank 3. Electric heat tracing 4. Insulation cotton 5. Bearing testing device 6. High temperature sealing gasket 7. Thermocouple 8. Variable frequency motor 501. Coupling assembly 502. Motor bracket 503. Round nut 504. Bearing assembly 505. Fan 506. Bracket 507. Sealing assembly 508. Vent valve 509. Bearing testing device insulation cotton 510. Shaft 511. Guide bearing seat 512. Guide shaft sleeve 513. Guide bearing 514. Eccentric block 515. Pressure plate 516. Detailed Implementation

[0028] The preferred embodiments of this utility model are given below with reference to the accompanying drawings to illustrate the technical solution of this utility model in detail.

[0029] Figure 1 This is a schematic diagram of the overall structure of this utility model. Figure 2 This is a schematic diagram of the bearing testing device in this utility model. Figure 3 for Figure 2A magnified view of a portion, such as Figure 1-3 As shown: This utility model proposes a sliding bearing testing system for a high-temperature molten salt pump, mainly comprising: a support 1, a molten salt tank 2, an electric heat tracing 3, insulation cotton 4, a bearing testing device 5, a high-temperature sealing gasket 6, and a thermocouple 7; the bearing testing device 5 mainly comprises: a variable frequency motor 501, a coupling assembly 502, a motor bracket 503, a round nut 504, a bearing assembly 505, a fan 506, a bracket 507, a sealing assembly 508, a vent valve 509, insulation cotton for the bearing testing device 510, a shaft 511, a guide bearing seat 512, a guide shaft sleeve 513, a guide bearing 514, an eccentric block 515, and a pressure plate 516.

[0030] Molten salt tank 2 contains molten salt, and electric heat tracing 3 is wrapped around the outside of molten salt tank 2. Electric heat tracing 3 heats the molten salt in molten salt tank to a specified temperature. Insulation cotton 4 is wrapped around the outside of electric heat tracing 3 to improve the heating efficiency of electric heat tracing on molten salt and to keep it warm.

[0031] Molten salt tank 2 is placed on support 1. The bearing testing device is installed on the molten salt tank by multiple bolts. A high-temperature sealing gasket is installed between the bearing testing device and the molten salt tank to prevent molten salt vapor from leaking out and to provide heat insulation.

[0032] Molten salt tank 2 contains molten salt, and the molten salt level must submerge the guide bearing seat 512 by at least 100 mm.

[0033] The testing system is equipped with thermocouples 7, which are inserted into the molten salt in the molten salt tank to accurately measure the temperature of the molten salt. This temperature is then transmitted to the electric heat tracing control system to precisely control the temperature of the molten salt.

[0034] The bearing testing device 5 has a threaded hole on its shaft, and a guide sleeve is fitted on the shaft. The guide sleeve is pressed onto the shaft by a pressure plate and bolts, and the torque is transmitted by a key.

[0035] An eccentric block 515 of a certain weight is installed on one side of the pressure plate 516 to simulate the radial force borne by the pump during actual operation. The weight of the eccentric block is calculated as follows: , Where: r is the distance (m) between the eccentric block and the center of rotation, F is the radial force (N) to be simulated, and n is the motor speed (r / min).

[0036] The guide bearing 514 is mounted on the guide bearing housing 512 by screws. The guide bearing 514 and the guide shaft sleeve 513 form a friction pair. The guide bearing 514 and the guide shaft sleeve 513 are easy to disassemble and assemble, and it is convenient to replace friction pairs of different materials for testing.

[0037] The guide bearing housing 512 and the sealing assembly 508 are welded to the bracket 507 to form a whole. The sealing assembly is equipped with multiple discs of high-temperature resistant packing to prevent molten salt vapor from leaking out along the shaft.

[0038] The support 507 is equipped with a bearing assembly 505, which contains a ball bearing that is mainly lubricated by high-temperature grease. This ensures the stable operation of the testing device and also bears the axial force from the rotor weight. A round nut is installed on the upper part of the bearing assembly 505. The axial position of the guide sleeve is adjusted by adjusting the round nut 504 to optimize its relative position with the guide bearing. The round nut 504 has two discs to prevent loosening during operation.

[0039] A motor bracket 503 is mounted on the bracket 507, and a variable frequency motor 501 is mounted on the motor bracket 503. The variable frequency motor 501 is connected to the shaft 511 through a coupling assembly 502.

[0040] A fan 506 is mounted on the shaft. The fan 506 is located between the bearing assembly 505 and the sealing assembly 508. It is used to insulate the heat of the lower part and prevent heat radiation to the bearing body, which would cause the bearing temperature to be too high, thus ensuring the stable operation of the device.

[0041] The sealing component 508 on the bracket 507 is surrounded by bearing testing device insulation cotton 510, which on the one hand prevents heat from being transferred to the bearing component, and on the other hand provides auxiliary insulation for the molten salt inside the molten salt tank.

[0042] A vent valve 509 is installed on the bracket 507, which is mainly used to balance the pressure inside the molten salt tank and prevent the pressure inside the molten salt tank from being too high, thus affecting the stable operation of the device.

[0043] This invention uses the detection of molten salt temperature and the control of electric heat tracing to make the molten salt temperature the same as the actual operating temperature, thus truly simulating the actual operating conditions of the molten salt pump.

[0044] This invention provides the radial force that the bearing will bear during actual operation by accurately calculating the weight of the eccentric block. After a test is completed, the radial force can be changed by replacing the eccentric block with one of different weights. The eccentric block is easy to install and the test efficiency is high.

[0045] By controlling the speed of the variable frequency motor, the condition of the sliding bearing can be made closer to the actual situation, thus more realistically reflecting the wear of the bearing in actual applications.

[0046] This invention can operate continuously without interruption, thereby improving testing efficiency and enabling the acquisition of test data in a short time.

[0047] The bearing testing device in this invention is easy and quick to assemble and disassemble, and can quickly observe and measure bearing wear to obtain test data.

[0048] In this invention, the guide bearing and guide sleeve are easy to assemble and disassemble, and after obtaining test data for one material, bearings of different materials can be quickly replaced for testing.

[0049] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of protection of this utility model as defined by the appended claims and their equivalents.

Claims

1. A testing system for sliding bearings used in high-temperature molten salt pumps, characterized in that: The high-temperature molten salt pump sliding bearing testing system includes: a support, a molten salt tank, electric heat tracing, insulation cotton, a bearing testing device, a high-temperature sealing gasket, and a thermocouple. The molten salt tank contains molten salt, and the outside of the molten salt tank is wrapped with electric heat tracing, which is then wrapped with insulation cotton. The molten salt tank is placed on the support, and the bearing testing device is installed on the molten salt tank. A high-temperature sealing gasket is installed between the bearing testing device and the molten salt tank to prevent molten salt vapor leakage and to provide heat insulation. The thermocouple is inserted into the molten salt inside the molten salt tank and is connected to an external electric heat tracing control system.

2. The high-temperature molten salt pump sliding bearing testing system according to claim 1, characterized in that: The bearing testing device is detachably mounted on the molten salt vessel using multiple bolts.

3. The high-temperature molten salt pump sliding bearing testing system according to claim 1, characterized in that: The bearing testing device includes: a variable frequency motor, a coupling assembly, a motor bracket, a round nut, a bearing assembly, a fan, a bracket, a sealing assembly, a shaft, a guide bearing housing, a guide shaft sleeve, a guide bearing, an eccentric block, and a pressure plate; The guide bearing housing and sealing assembly are welded to the bracket to form a single unit. The sealing assembly contains multi-disc high-temperature resistant packing to prevent molten salt vapor from leaking out along the shaft. An eccentric block of a certain weight is installed on one side of the pressure plate. The guide bearing is mounted on the guide bearing housing by screws, and the guide bearing and the guide shaft sleeve form a friction pair; The bracket is equipped with a bearing assembly, and a ball bearing is installed in the bearing assembly. A round nut is installed on the upper part of the bearing assembly, and the axial position of the guide sleeve is adjusted by adjusting the round nut. A motor bracket is mounted on the support frame, and a variable frequency motor is mounted on the motor bracket. The variable frequency motor is connected to the shaft via a coupling assembly.

4. The high-temperature molten salt pump sliding bearing testing system according to claim 3, characterized in that: The bearing testing device is surrounded by insulating cotton around the sealing components on the bracket.

5. The high-temperature molten salt pump sliding bearing testing system according to claim 3, characterized in that: A fan is mounted on the shaft, and the fan is located between the bearing assembly and the sealing assembly.

6. The high-temperature molten salt pump sliding bearing testing system according to claim 3, characterized in that: The molten salt tank is filled with molten salt, and the molten salt level submerges the lowest part of the guide bearing seat by more than 100 mm.

7. The high-temperature molten salt pump sliding bearing testing system according to claim 3, characterized in that: A venting pipe connecting to the outside is installed on the support, and a venting valve is installed on the venting pipe.

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