A kind of magnetic suspension motor sealing structure leakage measurement method and measuring device

Abstract

The application discloses a kind of magnetic suspension motor sealing structure leakage measurement methods and measuring device, measuring device includes the hollow sealing seat in the one end of the rotating shaft of magnetic suspension motor, upper cover plate fixed in the end of hollow sealing seat and the lower cover plate in the one end of the rotating shaft of magnetic suspension motor, and sealing cavity is formed by lower cover plate, hollow sealing seat, magnetic suspension motor shell and lower cover plate together;The inside of the hollow sealing seat is provided with partition, the sealing sleeve for positioning and fixing sealing ring is arranged at the cooperation part of the rotating shaft, and the sealing ring is fixed on the side surface of the rotating shaft to form a sealing structure by the sealing sleeve;The sealing structure leakage measurement mode of the application can simulate equipment operation, and actual leakage data is measured, so that all the seals installed on the equipment can meet the operation requirements of the equipment, thereby reducing energy consumption and working medium loss, improving equipment operation efficiency, and ensuring the safety and reliability of production process.

Description

Technical Field

[0001] This invention relates to the field of magnetic levitation motor testing technology, specifically to a method and device for measuring the leakage of a magnetic levitation motor's sealing structure. Background Technology

[0002] Seal leakage refers to the amount of working medium that unexpectedly leaks from the high-pressure side to the low-pressure side per unit time due to the sealing system's inability to completely block it. The magnitude of leakage during operation has a significant impact on rotor stability, equipment operating efficiency, and safety.

[0003] In practical production applications of magnetic levitation blowers, since the rotor is suspended and non-contact, selecting a reasonable and effective seal is key to reducing energy consumption and improving blower operating efficiency. In recent years, the application of process gas blowers and explosion-proof blowers has been increasing, placing higher demands on the seals of magnetic levitation blowers. Large seal leaks not only require continuous replenishment of expensive working fluid lost due to leakage, but more seriously, they can cause fires and explosions, posing a huge risk.

[0004] Existing leakage detection methods rely solely on flow meters. In practical applications, this can easily lead to discrepancies between the measured results and the actual leakage levels in the operating environment of the magnetic levitation motor where the sealing structure is used. Consequently, the performance of the sealing structure in real-world applications cannot be accurately predicted, thus affecting the use of the magnetic levitation motor. Summary of the Invention

[0005] Technical objective: To address the shortcomings of existing methods for measuring leakage in sealing structures, this invention discloses a method and device for measuring leakage in the sealing structure of a magnetic levitation motor.

[0006] Technical solution: To achieve the above technical objectives, the present invention adopts the following technical solution:

[0007] A method for measuring the leakage of a sealing structure of a magnetic levitation motor, comprising the following steps:

[0008] S01. Powering the magnetic bearings of the magnetic levitation motor completes the levitation of the magnetic levitation motor rotor;

[0009] S02. Gas is pre-introduced into the outside of the magnetic levitation motor rotor sealing structure to purge the inside of the magnetic levitation motor;

[0010] S03. Start the magnetic levitation motor, and drive the rotor to rotate through the stator of the magnetic levitation motor;

[0011] S04. Collect the gas flow rate on both sides of the sealing structure at different rotation speeds, and calculate the actual gas leakage through the sealing structure based on the gas temperature and pressure under the current measurement environment.

[0012] Preferably, in step S04 of the present invention, the gas pressure and temperature introduced into the magnetic levitation motor are matched with the working fluid gas pressure and temperature inside the motor under rated operating conditions.

[0013] Preferably, the actual gas leakage rate through the sealing structure in this invention is... And calculate the leakage percentage based on the amount of gas introduced. ,in The volumetric flow rate of the introduced gas. The pressure of the introduced gas. The temperature of the introduced gas; This represents the volumetric flow rate of the leaked gas. The pressure of the leaked gas. The temperature of the leaked gas.

[0014] Preferably, the initial gas temperature and pressure introduced in this invention are both greater than the working gas parameters inside the motor when the magnetic levitation motor is operating under rated conditions. When measuring the leakage, the leakage change curve is obtained, and the accurate leakage under the corresponding operating conditions is obtained based on the change curve.

[0015] This invention discloses a leakage measurement device for the sealing structure of a magnetic levitation motor. Using the aforementioned measurement method, it includes a hollow sealing seat located at one end of the magnetic levitation motor's shaft, an upper cover plate fixed to the end of the hollow sealing seat, and a lower cover plate located at the end opposite to the magnetic levitation motor's shaft. The lower cover plate, the hollow sealing seat, the magnetic levitation motor housing, and the lower cover plate together form a sealed cavity. A partition is provided inside the hollow sealing seat. A sealing sleeve is provided at the part of the partition that mates with the shaft to position and fix the sealing ring. The sealing sleeve fixes the sealing ring to the side of the shaft to form a sealing structure. The sealing ring and the partition plate divide the sealed cavity into two parts, referred to as the first part and the second part. The first part is connected to an external air source through an air inlet threaded hole on the upper cover plate, and the second part is connected to the internal space of the magnetic levitation motor. Temperature sensors, pressure sensors, and gas volume flow meters for detecting gas parameters are provided on both the upper and lower cover plates.

[0016] Preferably, the sealing sleeve of the present invention is a hollow T-shaped variable diameter stepped shaft structure, forming a stepped surface at the variable diameter, and is detachably connected to the partition plate at the stepped surface by a screw. The sealing ring is concentrically installed inside the sealing sleeve, and the shaft is sealed by the sealing ring.

[0017] Preferably, O-rings are provided at the mating surfaces of the upper cover plate, the hollow sealing seat, the magnetic levitation motor housing, and the lower cover plate for sealing, and the through holes of the magnetic levitation motor housing are sealed by potting adhesive.

[0018] Preferably, the gas volume flow meter of the present invention is located at the center of the upper cover plate and the lower cover plate.

[0019] Preferably, the rotating shaft and the magnetic levitation motor rotor of the present invention are detachably connected by a tie rod assembly. The tie rod assembly includes a tie rod whose end is fixed inside the magnetic levitation motor rotor. The tie rod is concentrically inserted inside the rotating shaft. A locking nut is threaded to the end of the tie rod. The rotating shaft and the magnetic levitation motor rotor are fixed by rotating the locking nut.

[0020] Beneficial Effects: The method and device for measuring the leakage of a magnetic levitation motor sealing structure disclosed in this invention have the following beneficial effects:

[0021] 1. The leakage measurement method of the sealing structure of this invention can simulate equipment operation and measure the actual leakage data, ensuring that all seals installed on the equipment can meet the equipment's operating requirements, thereby reducing energy consumption and working fluid loss, improving equipment operating efficiency, and ensuring the safety and reliability of the production process.

[0022] 2. This invention avoids the problem of inaccurate gas leakage detection due to environmental changes by simultaneously detecting gas pressure and temperature. Furthermore, by studying the leakage change curves through the introduction of gas exceeding the operating parameters, data under different operating conditions can be obtained, reducing the requirements for the accuracy of the test gas temperature and pressure. This improves measurement efficiency while reducing measurement costs.

[0023] 3. This invention uses a hollow sealing seat to install the sealing structure and separate the sealing cavity, which can quickly form a sealed environment and accurately measure the gas leakage from the high-pressure side to the low-pressure side of the sealing structure.

[0024] 4. This invention uses a sealing sleeve to fix the sealing ring, and the testing requirements for sealing rings of different sizes can be met by replacing the sealing sleeve, thereby reducing the equipment cost of the testing device and improving its versatility.

[0025] 5. The rotating shaft and the magnetic levitation motor rotor of the present invention are detachably connected by a tie rod assembly. Without changing the structure of the magnetic levitation motor, rotating shafts of different sizes can be connected through the magnetic levitation motor rotor, thereby meeting the testing requirements of rotating shafts and sealing structures of different specifications, simplifying the model of the testing device, and realizing the measurement of sealing leakage of magnetic levitation equipment of different specifications with the same magnetic levitation motor structure. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0027] Figure 1 This is a structural diagram of the measuring device of the present invention;

[0028] Figure 2This is a schematic diagram of the sealing ring installation of the present invention;

[0029] Among them, 1-rotating shaft, 2-hollow sealing seat, 3-upper cover plate, 4-lower cover plate, 5-magnetic levitation motor housing, 6-partition plate, 7-sealing ring, 8-sealing sleeve, 9-magnetic levitation motor rotor, 10-pull rod, 11-locking nut. Detailed Implementation

[0030] Reference will now be made in detail to embodiments of the present disclosure, one or more of which are set forth herein. Each embodiment and example is provided by way of explanation of the apparatus, composition, and materials of the present disclosure, and not by way of limitation. Rather, the following description provides convenient illustrations for implementing exemplary embodiments of the present disclosure. Indeed, it will be apparent to those skilled in the art that various modifications and variations can be made to the teachings of the present disclosure without departing from the scope or spirit of the present disclosure.

[0031] This invention discloses a method for measuring the leakage of a sealing structure in a magnetic levitation motor, comprising the following steps:

[0032] S01. Powering the magnetic bearings of the magnetic levitation motor completes the levitation of the magnetic levitation motor rotor;

[0033] S02. Gas is pre-introduced into the outside of the magnetic levitation motor rotor sealing structure to purge the inside of the magnetic levitation motor;

[0034] During operation, the working gas inside the magnetic levitation motor is on the high-pressure side, and the parameters of the working gas depend on the operating conditions of the magnetic levitation motor and are affected by the motor's own heat dissipation. The magnetic levitation motor of this invention is used to provide the shaft speed, but the operating environment affected by the sealing structure is different for different types of magnetic levitation equipment. Therefore, when measuring leakage, the outside of the sealing structure is used as the high-pressure side to introduce gas, while the side where the magnetic levitation motor is used for testing is the low-pressure side.

[0035] S03. Start the magnetic levitation motor, and drive the rotor to rotate through the stator of the magnetic levitation motor;

[0036] S04. Collect the gas flow rate on both sides of the sealing structure at different rotation speeds, and calculate the actual gas leakage through the sealing structure based on the gas temperature and pressure under the current measurement environment.

[0037] In step S04 of this invention, the gas pressure and temperature introduced into the magnetic levitation motor are matched with the working fluid gas pressure and temperature inside the motor under rated operating conditions; the actual gas leakage through the sealing structure in this invention is... The volumetric flow rate at 0°C and 1 standard atmosphere is used for standardized expression to facilitate comparison; and the leakage percentage is calculated based on the amount of gas introduced. ,in The volumetric flow rate of the introduced gas. The pressure of the introduced gas. The temperature of the introduced gas; This represents the volumetric flow rate of the leaked gas. The pressure of the leaked gas. The temperature of the leaked gas.

[0038] To reduce measurement difficulty and broaden the data range, and to analyze the actual application of the sealing structure, the initial gas temperature and pressure introduced in this invention are both higher than the working gas parameters inside the motor under rated operating conditions. When measuring leakage, the leakage change curve is obtained, and the accurate leakage under the corresponding operating conditions is obtained based on the change curve. At the same time, when the operating environment of the magnetic levitation equipment in which the sealing structure is applied changes, the corresponding measurement is adjusted and the working gas is replenished.

[0039] like Figure 1 and Figure 2 This invention discloses a leakage measurement device for the sealing structure of a magnetic levitation motor. Using the above-mentioned measurement method, it includes a hollow sealing seat 2 located at one end of the rotating shaft 1 of the magnetic levitation motor, an upper cover plate 3 fixed to the end of the hollow sealing seat 2, and a lower cover plate 4 located at the end opposite to the rotating shaft 1 of the magnetic levitation motor. The lower cover plate 4, the hollow sealing seat 2, the magnetic levitation motor housing 5, and the lower cover plate 4 together form a sealed cavity. A partition plate 6 is provided inside the hollow sealing seat 2. A sealing sleeve 8 is provided at the part of the partition plate 6 that cooperates with the rotating shaft 1 to position and fix the sealing ring 7. The sealing sleeve 8 fixes the sealing ring 7 to the side of the rotating shaft 1 to form a sealing structure. The sealing ring 7 and the plate surface of the partition plate 6 divide the sealed cavity into two parts, referred to as the first part and the second part. The first part is connected to an external air source through an air inlet thread hole opened on the upper cover plate 3. The second part is connected to the internal space of the magnetic levitation motor. Temperature sensors, pressure sensors, and gas volume flow meters for detecting gas parameters are provided on both the upper cover plate 3 and the lower cover plate 4.

[0040] The sealing sleeve 8 of this invention is a hollow T-shaped variable-diameter stepped shaft structure, forming a stepped surface at the diameter change. It is detachably connected to the partition plate 6 via screws passing through the stepped surface. A sealing ring 7 is concentrically installed inside the sealing sleeve 8, sealing the rotating shaft 1. The detachable design of the sealing sleeve 8 allows for the replacement of sealing rings 7 of different specifications without altering other structures of the measuring device, meeting various measurement needs. Furthermore, while the embodiment of this invention uses a sealing ring, other types of sealing structures can also be used to detect leakage based on sealing requirements, as long as the connection between the sealing structure and the partition plate 6 is maintained.

[0041] In this invention, O-rings are provided at the mating surfaces of the upper cover plate 3, the hollow sealing seat 2, the magnetic levitation motor housing 5, and the lower cover plate 4 for sealing. The through holes of the magnetic levitation motor housing 5 are sealed by potting glue to form a sealed environment, so that the gas flows only through the gas inlet and outlet channels of the gas flow meter at the corresponding positions on the upper cover plate 3 and the lower cover plate 4. The gas volume flow meter of this invention is set at the center of the upper cover plate 3 and the lower cover plate 4 to reduce the impact of uneven gas flow on the accuracy of the measurement results.

[0042] Furthermore, to broaden the application range of the measuring device and reduce the cost of testing equipment, the present invention provides a detachable connection between the rotating shaft 1 and the magnetic levitation motor rotor 9 via a tie rod assembly, thereby enabling the measurement of the performance of sealing structures of different sizes and specifications. The tie rod assembly includes a tie rod 10 with its end fixed inside the magnetic levitation motor rotor 9. The tie rod 10 is concentrically inserted inside the rotating shaft 1, and a locking nut 11 is threaded to the end of the tie rod 10. By rotating the locking nut 11, the rotating shaft 1 and the magnetic levitation motor rotor 9 are fixed, allowing for convenient replacement of the rotating shaft. Without replacing the magnetic levitation motor used for testing, the rotating shaft can be directly replaced, reducing the equipment cost for measuring sealing structures of different sizes.

[0043] When using the measuring device of the present invention, such as Figure 1 As shown, gas is first introduced into the first part through the upper cover plate 3 via a gas source. The gas can be preheated by a heating device before introduction to make its temperature higher than the working environment parameters of the magnetic levitation device used in the sealing structure. After a certain period of gas introduction, the gas type in the sealed cavity is all the introduced gas, and the original gas is emptied, thereby ensuring that the gas type is singular during the measurement process and reducing the impact on the measurement results. The introduction time can be set based on experience or a gas detection structure (gas sensor) can be set on the lower cover plate to ensure that the original gas in the sealed cavity is fully discharged. Then, according to the measurement requirements, the magnetic levitation motor is started to drive the rotating shaft 1 to rotate, and gas at a predetermined temperature and pressure is introduced into the first part, while maintaining the gas pressure stable. During the operation of the magnetic levitation motor, due to the pressure difference on both sides of the sealing structure, some gas will leak from the high-pressure side to the low-pressure side due to the sealing effect of the sealing structure itself. At this time, the flow meter, temperature sensor and pressure sensor on the lower cover plate 4 can detect the parameters of the leaked gas, thereby determining the amount of gas leakage. Based on the gas parameters on the gas inlet side, the percentage of gas leakage is calculated, thereby realizing the measurement and detection of the sealing performance of the sealing structure.

[0044] In addition, based on the application environment conditions of the sealed structure, the pressure parameters of the introduced gas can be adjusted to obtain a continuous leakage change curve, providing a reference for the actual use of magnetic levitation equipment and meeting the usage requirements under different working conditions.

[0045] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A method for measuring the leakage of a magnetic levitation motor's sealing structure, characterized in that, Including the following steps: S01. Powering the magnetic bearings of the magnetic levitation motor completes the levitation of the magnetic levitation motor rotor; S02. Gas is pre-introduced into the outside of the magnetic levitation motor rotor sealing structure to purge the inside of the magnetic levitation motor; S03. Start the magnetic levitation motor, and drive the rotor to rotate through the stator of the magnetic levitation motor; S04. Collect the gas flow rate on both sides of the sealing structure at different rotation speeds, and calculate the actual gas leakage through the sealing structure based on the gas temperature and pressure under the current measurement environment. In step S04, the gas pressure and temperature introduced into the magnetic levitation motor are matched with the working fluid gas pressure and temperature inside the motor under rated operating conditions.

2. The method for measuring the leakage of a magnetic levitation motor sealing structure according to claim 1, characterized in that, The actual gas leakage through the sealed structure is And calculate the leakage percentage based on the amount of gas introduced. ,in The volumetric flow rate of the introduced gas. The pressure of the introduced gas. The temperature of the introduced gas; This represents the volumetric flow rate of the leaked gas. The pressure of the leaked gas. The temperature of the leaked gas.

3. The method for measuring the leakage of a magnetic levitation motor sealing structure according to claim 1, characterized in that, The initial gas temperature and pressure are both higher than the working gas parameters inside the motor when the magnetic levitation motor is operating under rated conditions. When measuring the leakage, the leakage change curve is obtained, and the accurate leakage under the corresponding operating conditions is obtained based on the change curve.

4. A device for measuring the leakage of a magnetic levitation motor sealing structure, using the measurement method described in any one of claims 1-3, characterized in that, The system includes a hollow sealing seat (2) located at one end of the rotating shaft (1) of the magnetic levitation motor, an upper cover plate (3) fixed to the end of the hollow sealing seat (2), and a lower cover plate (4) located at the end opposite to the rotating shaft (1) of the magnetic levitation motor. The upper cover plate (3), the hollow sealing seat (2), the magnetic levitation motor housing (5), and the lower cover plate (4) together form a sealed cavity. A partition plate (6) is provided inside the hollow sealing seat (2), and the partition plate (6) is provided at the joint with the rotating shaft (1) to position and fix the sealing ring (7). The sealing sleeve (8) fixes the sealing ring (7) to the side of the rotating shaft (1) to form a sealing structure. The sealing ring (7) and the plate surface of the partition (6) divide the sealing cavity into two parts, referred to as the first part and the second part. The first part is connected to the external air source through the air inlet thread hole opened on the upper cover plate (3). The second part is connected to the internal space of the magnetic levitation motor. Temperature sensors, pressure sensors and gas volume flow meters for detecting gas parameters are set on both the upper cover plate (3) and the lower cover plate (4).

5. The leakage measurement device for the sealing structure of a magnetic levitation motor according to claim 4, characterized in that, The sealing sleeve (8) is a hollow T-shaped variable diameter stepped shaft structure, forming a stepped surface at the variable diameter. It is detachably connected to the partition plate (6) by a screw through the stepped surface. The sealing ring (7) is concentrically installed inside the sealing sleeve (8) to seal the rotating shaft (1).

6. The leakage measurement device for the sealing structure of a magnetic levitation motor according to claim 4, characterized in that, O-rings are provided at the mating surfaces of the upper cover plate (3), the hollow sealing seat (2), the magnetic levitation motor housing (5), and the lower cover plate (4) for sealing. The through holes of the magnetic levitation motor housing (5) are sealed by potting glue.

7. The leakage measurement device for the sealing structure of a magnetic levitation motor according to claim 4, characterized in that, The gas volume flow meter is located at the center of the upper cover plate (3) and the lower cover plate (4).

8. The leakage measurement device for the sealing structure of a magnetic levitation motor according to claim 4, characterized in that, The rotating shaft (1) and the magnetic levitation motor rotor (9) are detachably connected by a tie rod assembly. The tie rod assembly includes a tie rod (10) with its end fixed inside the magnetic levitation motor rotor (9). The tie rod (10) is concentrically inserted inside the rotating shaft (1). A locking nut (11) is threaded onto the end of the tie rod (10). The rotating shaft (1) and the magnetic levitation motor rotor (9) are fixed by rotating the locking nut (11).

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