Testing device and testing method for magnetic powder sealing

Abstract

The embodiment of the invention discloses a testing device and a testing method for magnetic powder sealing. The magnetic powder sealing testing device comprises a supporting assembly, a testing pipe, a magnetic source assembly, an air source and a flow detection component, the testing pipe is provided with an air inlet end and an air outlet end, and the testing pipe is detachably connected to the supporting assembly; the magnetic source assembly is connected to the supporting assembly, and the magnetic source assembly corresponds to partial sections of the test tube; the gas source is connected to the gas inlet end of the test tube and is used for conveying gas into the test tube; the flow detection component is connected to the air outlet end of the test tube and used for detecting the flow of air discharged from the air outlet end of the test tube. According to the testing device for the magnetic powder seal, the leakage rate of the magnetic powder seal can be tested by changing factors such as environment pressure, magnetic powder compactness and magnetic field intensity, so that systematic research and analysis of the magnetic powder seal are realized, and further optimization of a magnetic powder seal structure is facilitated.

Description

Technical Field

[0001] The invention belongs to the field of testing technology, and in particular relates to a testing device and a testing method for magnetic powder seals. Background Art

[0002] Magnetic powder seal is a sealing method that uses magnetic particles as the main body and magnetic powder (hereinafter referred to as "magnetic powder") formed after surface lubricant and lubricant modification as the sealing medium. Compared with the traditional sealing method in related technologies, magnetic powder seal has a series of advantages such as low leakage rate, high pressure resistance, high and low temperature resistance, high speed resistance, etc., and has played an important role in many fields.

[0003] However, in the actual application of magnetic powder seal technology, there has been a lack of methods to test the performance of magnetic powder seals, and it is impossible to conduct systematic research and in-depth analysis of magnetic powder seals. This directly leads to the difficulty in accurately identifying the root cause of the problem when facing seal failure, and it is impossible to determine whether it is a defect in the seal component itself or other external factors that cause the seal leakage. Summary of the invention

[0004] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

[0005] To this end, an embodiment of the present invention provides a magnetic powder seal testing device capable of testing the leakage of the magnetic powder seal.

[0006] An embodiment of the present invention provides a method for testing a magnetic powder seal.

[0007] The testing device for magnetic powder seal according to the embodiment of the present invention comprises:

[0008] Support components;

[0009] A test tube, the test tube having an air inlet end and an air outlet end, the test tube being detachably connected to the support assembly;

[0010] A magnetic source component, the magnetic source component is connected to the support component, and the magnetic source component corresponds to a partial section of the test tube;

[0011] A gas source, the gas source being connected to the gas inlet end of the test tube and being used to transport gas into the test tube;

[0012] A flow detection component is connected to the gas outlet end of the test tube, and is used to detect the gas flow rate discharged from the gas outlet end of the test tube.

[0013] The magnetic powder seal testing device of the embodiment of the present invention can test the leakage rate of the magnetic powder seal by changing factors such as the ambient pressure, the density of the magnetic powder, and the magnetic field strength, thereby realizing a systematic study and analysis of the magnetic powder seal, facilitating further optimization of the magnetic powder seal structure, and facilitating more accurate identification of the causes of seal failure in actual applications, thereby reducing the maintenance cost of the sealing system in actual applications.

[0014] In some embodiments, the support assembly includes a base plate, a support seat and a pressure cover, the number of the support seats is at least two, the support seat is fixed on the base plate, the pressure cover is fixed on the support seat, and the test tube is fixed between the pressure cover and the support seat.

[0015] In some embodiments, the magnetic source assembly includes a first magnetic yoke, a second magnetic yoke and a magnetic component, the first magnetic yoke has a first working end, the second magnetic yoke has a second working end, the first working end and the second working end are arranged relative to each other and form a yoke air gap, and a partial section of the test tube is located in the yoke air gap, and the magnetic component is arranged between the first magnetic yoke and the second magnetic yoke to form a magnetic field at the yoke air gap.

[0016] In some embodiments, a regulating component is further included, wherein the regulating component is disposed between the gas source and the gas inlet end of the test tube, and the regulating component is used to adjust the parameters of the air flow flowing to the test tube.

[0017] And / or, further comprising a control valve, wherein the control valve is disposed between the gas outlet end of the test tube and the flow detection component to control the connection or disconnection of the communication pipeline between the test tube and the flow detection component;

[0018] And / or, the flow detection component is a flow meter;

[0019] And / or, the air source is an air compressor.

[0020] In some embodiments, a heating jacket and a temperature detection component are further included. The heating jacket is mounted on the test tube to heat a partial section of the test tube, and the temperature detection component is used to detect the temperature of the heating jacket.

[0021] The testing method of the magnetic powder seal of the embodiment of the present invention uses the testing device of the magnetic powder seal described in any of the above embodiments to test the magnetic powder seal, and the testing method includes:

[0022] S1, configuring a testing device for the magnetic powder seal;

[0023] S2, injecting magnetic powder particles into the test tube, and moving the magnetic powder particles to a preset section in the test tube;

[0024] S3, fixing the test tube on the support assembly, aligning the magnetic source assembly with the magnetic powder particles in the test tube, and connecting the air inlet and air outlet of the test tube to the air source and the flow detection component respectively;

[0025] S4. Configure the parameters of the magnetic powder seal test device to apply a magnetic field to the section where the magnetic powder particles in the test tube are located through the magnetic source component, deliver pressurized gas to the air inlet end of the test tube through the air source, and obtain the leaked air flow through the flow detection component.

[0026] In some embodiments, step S4 includes the following steps:

[0027] Adjusting the parameters of the magnetic source assembly to apply a magnetic field to the section where the magnetic powder particles in the test tube are located;

[0028] Adjusting the pressure at the air inlet end of the test tube, connecting the connecting pipe between the test tube and the flow detection component, and obtaining the air flow data of the flow detection component;

[0029] Increasing or decreasing the pressure at the air inlet end of the test tube, and acquiring air flow data of the flow detection component;

[0030] Repeat the previous step to obtain the gas flow data of the flow detection component corresponding to different pressures;

[0031] Based on the air flow data of the flow detection component corresponding to different pressures, the relationship between the pressure change and the leakage rate of the magnetic powder seal is obtained.

[0032] In some embodiments, step S4 includes the following steps:

[0033] Adjusting the parameters of the magnetic source assembly to apply a magnetic field to the section where the magnetic powder particles in the test tube are located;

[0034] Adjusting the pressure of the air inlet end of the test tube to a first threshold value, connecting the connecting pipe between the test tube and the flow detection component, and obtaining the air flow data of the flow detection component;

[0035] Disconnect the connecting pipe between the test tube and the flow detection component to block the air outlet of the test tube, adjust the pressure of the air inlet end of the test tube to compact the magnetic powder particles in the test tube under a preset compaction pressure, and after maintaining the pressure for T1 time, adjust the pressure of the air inlet end of the test tube to a first threshold value, connect the connecting pipe between the test tube and the flow detection component, and obtain the air flow data of the flow detection component;

[0036] Repeat the previous step and gradually increase the pressure value of the preset compaction pressure to obtain the air flow data of the flow detection component corresponding to different preset compaction pressures;

[0037] Based on the air flow data of the flow detection component corresponding to different preset compaction pressures, the relationship between the compaction degree of the magnetic powder and the leakage rate of the magnetic powder seal is obtained.

[0038] In some embodiments, step S4 includes the following steps:

[0039] Adjusting the parameters of the magnetic source assembly to apply a magnetic field to the section where the magnetic powder particles in the test tube are located;

[0040] Adjusting the pressure value of the air inlet end of the test tube, connecting the connecting pipe between the test tube and the flow detection component, and obtaining the air flow data of the flow detection component;

[0041] Increasing or decreasing the magnetic field strength applied by the magnetic source component to the section where the magnetic powder particles in the test tube are located, and obtaining the air flow data of the flow detection component under the magnetic field strength;

[0042] Repeat the previous step to respectively obtain the air flow data of the flow detection component corresponding to different magnetic field strengths;

[0043] Based on the air flow data of the flow detection component corresponding to different magnetic field intensities, the relationship between the magnetic powder strength and the leakage rate of the magnetic powder seal is obtained.

[0044] In some embodiments, step S4 includes the following steps:

[0045] Adjusting the parameters of the magnetic source assembly to apply a magnetic field to the section where the magnetic powder particles in the test tube are located;

[0046] The section where the magnetic powder particles in the test tube are located is heated to a first temperature and maintained for a time T2;

[0047] Adjusting the pressure at the air inlet end of the test tube, connecting the connecting pipe between the test tube and the flow detection component, and obtaining the air flow data of the flow detection component;

[0048] Increasing or decreasing the temperature of the section where the magnetic powder particles in the test tube are located, and obtaining the air flow data of the flow detection component at the temperature;

[0049] Repeat the previous step to respectively obtain the air flow data of the flow detection component corresponding to different temperatures;

[0050] Based on the corresponding air flow data of the flow detection component at different temperatures, the relationship between the temperature and the leakage rate of the magnetic powder seal is obtained. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 Schematic diagram of a testing device for magnetic powder seal according to an embodiment of the present invention.

[0052] Figure 2 Schematic diagram of injecting magnetic powder particles into a test tube according to an embodiment of the present invention.

[0053] Figure 3 It is a schematic diagram of driving the movement of magnetic powder particles in a test tube according to an embodiment of the present invention.

[0054] Figure 4 It is another schematic diagram of driving the movement of magnetic powder particles in a test tube according to an embodiment of the present invention.

[0055] Figure 5 It is a schematic diagram of a test tube fixed on a support assembly according to an embodiment of the present invention.

[0056] Figure 6 1 is another schematic diagram of a test tube fixed on a support assembly according to an embodiment of the present invention.

[0057] Figure 7 The figure is a flow chart of a method for testing a magnetic powder seal according to an embodiment of the present invention.

[0058] Figure 8 The figure is a flow chart of a method for testing a magnetic powder seal according to another embodiment of the present invention.

[0059] Fig. 9 The figure is a flow chart of a method for testing a magnetic powder seal according to another embodiment of the present invention.

[0060] Fig.10 The figure is a flow chart of a method for testing a magnetic powder seal according to another embodiment of the present invention.

[0061] Fig.11 The figure is a flow chart of a method for testing a magnetic powder seal according to another embodiment of the present invention.

[0062] Reference numerals:

[0063] 1. Gas source; 2. Pressure reducing valve; 3. Flow valve; 4. Connecting pipe; 5. Test tube; 6. Pressure cover; 7. Support seat; 8. First yoke; 9. Magnetic component; 10. Second yoke; 11. Bottom plate; 12. Control valve off; 13. Flow detection component; 14. Magnetic powder particles; 15. Magnetic powder injector; 16. Magnet; 17. Heating sleeve; 18. Temperature detection component. DETAILED DESCRIPTION

[0064] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0065] like Figure 1 As shown, the testing device for magnetic powder seal according to the embodiment of the present invention comprises a supporting assembly, a testing tube 5 , a magnetic source assembly, an air source 1 and a flow detection component 13 .

[0066] The test tube 5 has an air inlet end and an air outlet end, and the test tube 5 is detachably connected to the support assembly. In application, magnetic powder is injected into the test tube 5, and the magnetic powder can be used as a seal to seal the test tube 5. When it is necessary to inject magnetic powder particles 14 into the test tube 5, the test tube 5 can be removed from the support assembly, and then the magnetic powder particles 14 are injected into the test tube 5, and finally the test tube 5 is fixed to the support assembly. Of course, when cleaning the test tube 5, the test tube 5 can also be removed from the support assembly. Optionally, when injecting magnetic powder, the test tube 5 can be kept intact, but the connecting pipes 4 connected to the two ends of the test tube 5 can be removed, and the magnetic powder particles 14 can be directly injected into the test tube 5 fixed on the support assembly.

[0067] The magnetic source assembly is connected to the support assembly, and the magnetic source assembly corresponds to a partial section of the test tube 5. The magnetic source assembly can form a magnetic field, and make the section where the magnetic particles in the test tube 5 are located in the magnetic field. Under the action of the magnetic field, the magnetic particles are prevented from escaping from the magnetic field, so that the magnetic powder particles 14 are located in a partial section of the test tube 5.

[0068] The gas source 1 is connected to the gas inlet end of the test tube 5, and the gas source 1 is used to transport gas into the test tube 5. The flow detection component 13 is connected to the gas outlet end of the test tube 5, and the flow detection component 13 is used to detect the gas flow rate discharged from the gas outlet end of the test tube 5. The gas inlet end of the test tube 5 is placed under a certain gas pressure, and by detecting the gas flow rate of the flow detection component 13, it is determined whether there is gas passing through the magnetic powder particles 14 of the test tube 5 to cause leakage. For example, when the gas flow rate obtained by the flow detection component 13 is 0, it means that the magnetic powder seal in the test tube 5 is leaking under the corresponding pressure and magnetic field strength. For another example, when the gas flow rate obtained by the flow detection component 13 is greater than 0, it means that the magnetic powder seal in the test tube 5 is leaking under the corresponding pressure and magnetic field strength. The embodiment of the present invention can obtain the relationship between the configuration parameters and the leakage rate by changing the configuration parameters. By changing the environmental pressure, magnetic powder density, magnetic field strength and other factors to test the leakage rate of the magnetic powder seal, a systematic study and analysis of the magnetic powder seal can be achieved, which is convenient for further optimization of the magnetic powder seal structure and more accurate identification of the cause of seal failure in actual applications, thereby reducing the maintenance cost of the sealing system in actual applications.

[0069] like Figure 1 and Figure 6 As shown, in some embodiments, the magnetic powder seal test device further includes a heating sleeve 17 and a temperature detection component 18. The temperature detection component 18 may be a thermocouple. The heating sleeve 17 is sleeved on the test tube 5 to heat a portion of the test tube 5. The temperature detection component 18 is used to detect the temperature of the heating sleeve 17. By changing the temperature of the environment in which the magnetic powder particles 14 are located, the relationship between the temperature and the leakage rate of the magnetic powder particles 14 can be obtained.

[0070] Some specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0071] like Figures 1 to 6 As shown, the magnetic powder seal testing device according to the embodiment of the present invention includes a support assembly, a test tube 5 , a magnetic source assembly, an air source 1 , a flow detection component 13 and a heating sleeve 17 .

[0072] The support assembly includes a bottom plate 11, a support seat 7 and a gland 6. There are at least two support seats 7, the support seat 7 is fixed on the bottom plate 11, the gland 6 is fixed on the support seat 7, and the test tube 5 is fixed between the gland 6 and the support seat 7. For example, the cover plate and the support seat 7 are fixedly connected by connecting members such as bolts, and at least one of the cover plate and the support seat 7 is provided with an arc-shaped positioning groove, and the test tube 5 can be placed in the arc-shaped positioning groove for positioning to prevent the test tube 5 from being lateralized.

[0073] The test tube 5 and the magnetic source assembly are both connected to the support assembly. An identification mark can be set on the outer wall of the test tube 5 to facilitate determining the position of the test tube 5 and the support seat 7 according to the identification mark to ensure that the relative position of the test tube 5 and the magnetic source assembly is fixed.

[0074] The test tube 5 has an air inlet and an air outlet. In application, magnetic powder is injected into the test tube 5, and the magnetic powder can be used as a seal to seal the test tube 5. When it is necessary to inject magnetic powder particles 14 into the test tube 5, the test tube 5 can be removed from the support assembly, and then the magnetic powder particles 14 are injected into the test tube 5, and finally the test tube 5 is fixed to the support assembly. Of course, when cleaning the test tube 5, the test tube 5 can also be removed from the support assembly. Optionally, when injecting magnetic powder, the test tube 5 can be kept intact, but the connecting pipes 4 connected to the two ends of the test tube 5 can be removed, and the magnetic powder particles 14 can be directly injected into the test tube 5 fixed to the support assembly.

[0075] The magnetic source assembly corresponds to a partial section of the test tube 5. Specifically, the magnetic source assembly includes a first magnetic yoke 8, a second magnetic yoke 10 and a magnetic component 9. The first magnetic yoke 8 and the second magnetic yoke 10 are both fixed on the bottom plate 11. The first magnetic yoke 8 has a first working end, and the second magnetic yoke 10 has a second working end. The first working end and the second working end are arranged relative to each other and form a magnetic yoke air gap. A partial section of the test tube 5 (a section for arranging magnetic powder particles 14) is located in the magnetic yoke air gap. The magnetic component 9 is arranged between the first magnetic yoke 8 and the second magnetic yoke 10 to form a magnetic field at the magnetic yoke air gap. The magnetic component 9 can use an electromagnet 16 so as to control the magnetic field strength in the magnetic yoke air gap according to the adjustment current size.

[0076] In this embodiment, the magnetic source component is capable of forming a magnetic field. After the section where the magnetic particles in the test tube 5 are located is arranged in the magnetic field, under the action of the magnetic field, the magnetic powder particles 14 are located in a partial section of the test tube 5 and a magnetic powder seal is formed to block the conduction between the air inlet and air outlet ends of the test tube 5.

[0077] The gas source 1 is connected to the air inlet end of the test tube 5, and the gas source 1 is used to transport gas into the test tube 5. The flow detection component 13 is connected to the air outlet end of the test tube 5, and the flow detection component 13 is used to detect the amount of gas discharged from the air outlet end of the test tube 5. Among them, the gas source 1 can be an air compressor, and the flow detection component 13 is a flow meter. An adjusting component is provided between the gas source 1 and the air inlet end of the test tube 5, and the adjusting component includes but is not limited to a pressure reducing valve 2 and a flow valve 3. The gas flow parameters such as the gas pressure and flow rate flowing to the test tube 5 can be adjusted by the adjusting component, so as to test the leakage rate of the magnetic powder seal under different air flow parameters.

[0078] A control valve is provided between the gas outlet of the test tube 5 and the flow detection component 13, and the control valve can control the connection or disconnection of the connecting pipe 4 between the test tube 5 and the flow detection component 13. When the control valve 12 is closed, the gas outlet of the test tube 5 is blocked, and when the control valve is opened, the gas outlet of the test tube 5 is connected to the flow detection component 13, and when the magnetic powder seal leaks, the flow detection component 13 can obtain gas flow data.

[0079] The heating sleeve 17 is sleeved on the test tube 5 to heat a part of the test tube 5. A temperature detection component 18 is provided on the inner wall of the heating sleeve 17 near the test tube 5. The temperature detection component 18 is used to detect the temperature of the heating sleeve 17. By changing the temperature of the environment in which the magnetic powder particles 14 are located, the relationship between the temperature and the leakage rate of the magnetic powder particles 14 can be obtained. Optionally, an electric heating element is provided in the heating sleeve 17. When powered on, it can increase the temperature and heat the test tube 5. After a period of time, the temperature inside and outside the test tube 5 can be made consistent, so as to detect the influence of temperature on the leakage rate of the magnetic powder seal.

[0080] In the embodiment of the present invention, the air inlet end of the test tube 5 is kept under a certain gas pressure, and by detecting the air flow rate of the flow detection component 13, it is determined whether there is gas passing through the magnetic powder particles 14 of the test tube 5 to cause leakage. For example, when the air flow rate obtained by the flow detection component 13 is 0, it means that the magnetic powder seal in the test tube 5 is leaking under the corresponding pressure and magnetic field strength. For another example, when the air flow rate obtained by the flow detection component 13 is greater than 0, it means that the magnetic powder seal in the test tube 5 is leaking under the corresponding pressure and magnetic field strength.

[0081] The embodiment of the present invention can obtain the relationship between the configuration parameters and the leakage rate by changing the configuration parameters. The leakage rate of the magnetic powder seal is tested by changing factors such as the environmental pressure, the density of the magnetic powder, and the magnetic field strength, thereby achieving a systematic study and analysis of the magnetic powder seal, facilitating further optimization of the magnetic powder seal structure, and facilitating more accurate identification of the cause of seal failure in actual application situations, thereby reducing the maintenance cost of the sealing system in actual applications.

[0082] like Figure 7 As shown, the magnetic powder seal test method of the embodiment of the present invention uses the magnetic powder seal test device in any of the above embodiments to test the magnetic powder seal, and the test method includes:

[0083] S1. Configure a test device for magnetic powder seal. Specifically, fix the magnetic source assembly on the support assembly, and use the connecting pipe 4 to pre-assemble and connect the gas source 1, flow detection component 13, pressure reducing valve 2, flow valve 3, control valve and other components so that they can be connected to the test tube 5 for testing at any time.

[0084] S2, injecting magnetic powder particles 14 into the test tube 5, and moving the magnetic powder particles 14 to a preset section in the test tube 5. When injecting the magnetic powder particles 14, Figures 2 to 4 As shown, a magnetic powder injector 15 can be used to absorb a certain volume of magnetic powder particles 14, which are injected into the test tube 5 from one end of the test tube 5, and then a magnet 16 is used to move close to the test tube 5, so as to attract the magnetic powder particles 14 in the test tube 5 to a predetermined position (for example, the middle of the test tube 5). A mark can be set in the middle of the test tube 5 for easy operation, or the test tube 5 can be set to be transparent for direct observation of the position of the magnetic powder particles 14 in the test tube 5.

[0085] Optionally, a magnetic powder injector 15 is used to absorb a certain volume of magnetic powder particles 14, and the injection section of the magnetic powder injector 15 can extend into the middle of the test tube 5. The magnetic powder injector 15 can then be used to directly inject the magnetic powder particles 14 into place without having to adjust the position of the magnetic powder particles 14 in the test tube 5 through the magnet 16.

[0086] S3, fix the test tube 5 on the support assembly, and firmly fix the test tube 5 through the gland 6 support seat 7 to prevent relative movement between the test tube 5 and the magnetic source assembly during the test, so as to avoid parameter changes and thus affect the reliability of the data. Figure 5 As shown, the magnetic source assembly is aligned with the magnetic powder particles 14 in the test tube 5 to ensure that the magnetic field strength of the magnetic powder particles 14 reaches the target value, and the air inlet and outlet ends of the test tube 5 are respectively connected to the air source 1 and the flow detection component 13. At this point, the preliminary preparation of the magnetic powder seal test device is completed, and the parameters can be set according to the needs and the sealing performance of the magnetic powder seal can be tested.

[0087] S4. Configure the parameters of the magnetic powder seal test device to apply a magnetic field to the section where the magnetic powder particles 14 in the test tube 5 are located through the magnetic source component, deliver pressurized gas to the air inlet end of the test tube 5 through the gas source 1, and obtain the leaked gas flow through the flow detection component 13. According to different needs, the effects of gas pressure, ambient temperature, magnetic powder compaction degree, magnetic field strength and other parameters on the performance of the magnetic powder seal can be tested separately. During the test, one variable can be set, or multiple variables can be set to conduct a systematic study and analysis of the magnetic powder seal in multiple dimensions.

[0088] Some specific embodiments of the magnetic powder seal testing method are described in detail below with reference to the accompanying drawings.

[0089] like Figure 8 As shown, in some embodiments, the magnetic powder seal test method of the embodiment of the present invention uses the magnetic powder seal test device in any of the above embodiments to test the magnetic powder seal, and the test method includes:

[0090] S1. Configure a test device for magnetic powder seal. Specifically, fix the magnetic source assembly on the support assembly, and use the connecting pipe 4 to pre-assemble and connect the gas source 1, flow detection component 13, pressure reducing valve 2, flow valve 3, control valve and other components so that they can be connected to the test tube 5 for testing at any time.

[0091] S2, injecting magnetic powder particles 14 into the test tube 5, and moving the magnetic powder particles 14 to a preset section in the test tube 5. When injecting the magnetic powder particles 14, Figures 2 to 4 As shown, a magnetic powder injector 15 can be used to absorb a certain volume of magnetic powder particles 14, which are injected into the test tube 5 from one end of the test tube 5, and then a magnet 16 is used to move close to the test tube 5, so as to attract the magnetic powder particles 14 in the test tube 5 to a predetermined position (for example, the middle of the test tube 5, a mark can be set in the middle of the test tube 5 for easy operation, or the test tube 5 can be set to be transparent for direct observation of the position of the magnetic powder particles 14 in the test tube 5).

[0092] Optionally, a magnetic powder injector 15 is used to absorb a certain volume of magnetic powder particles 14, and the injection section of the magnetic powder injector 15 can extend into the middle of the test tube 5. The magnetic powder injector 15 can then be used to directly inject the magnetic powder particles 14 into place without having to adjust the position of the magnetic powder particles 14 in the test tube 5 through the magnet 16.

[0093] S3, fix the test tube 5 on the support assembly, and firmly fix the test tube 5 through the gland 6 support seat 7 to prevent relative movement between the test tube 5 and the magnetic source assembly during the test, so as to avoid parameter changes and thus affect the reliability of the data. Figure 5 As shown, the magnetic source assembly is aligned with the magnetic powder particles 14 in the test tube 5 to ensure that the magnetic field strength of the magnetic powder particles 14 reaches the target value, and the air inlet and outlet ends of the test tube 5 are respectively connected to the air source 1 and the flow detection component 13. At this point, the preliminary preparation of the magnetic powder seal test device is completed, and the parameters can be set according to the needs and the sealing performance of the magnetic powder seal can be tested.

[0094] S411 , adjusting the parameters of the magnetic source assembly to apply a magnetic field to the section where the magnetic powder particles 14 in the test tube 5 are located and reach a target value.

[0095] S412, adjust the pressure at the air inlet end of the test tube 5, connect the connecting pipe 4 between the test tube 5 and the flow detection component 13, obtain the air flow data of the flow detection component 13, and obtain a first set of pressure and air flow data correlation data of the flow detection component 13.

[0096] S413, increase or decrease the pressure at the air inlet end of the test tube 5, and obtain the air flow data of the flow detection component 13, and obtain a second set of pressure and air flow data correlation data of the flow detection component 13.

[0097] S414, repeat the previous step to obtain the air flow data of the flow detection component 13 corresponding to different pressures, and obtain the third group, the fourth group, ... the nth group of pressure and air flow data association data of the flow detection component 13.

[0098] S415, based on the air flow data of the flow detection component 13 corresponding to different pressures, the relationship between the pressure change and the leakage rate of the magnetic powder seal is obtained. This can more systematically study and analyze the leakage rate of the magnetic powder seal under different pressures, and facilitate the optimization of the magnetic powder seal structure in practical applications.

[0099] like Fig. 9 As shown, in some embodiments, the magnetic powder seal test method of the embodiment of the present invention uses the magnetic powder seal test device in any of the above embodiments to test the magnetic powder seal, and the test method includes:

[0100] S1. Configure a test device for magnetic powder seal. Specifically, fix the magnetic source assembly on the support assembly, and use the connecting pipe 4 to pre-assemble and connect the gas source 1, flow detection component 13, pressure reducing valve 2, flow valve 3, control valve and other components so that they can be connected to the test tube 5 for testing at any time.

[0101] S2, injecting magnetic powder particles 14 into the test tube 5, and moving the magnetic powder particles 14 to a preset section in the test tube 5. When injecting the magnetic powder particles 14, Figures 2 to 4 As shown, a magnetic powder injector 15 can be used to absorb a certain volume of magnetic powder particles 14, which are injected into the test tube 5 from one end of the test tube 5, and then a magnet 16 is used to move close to the test tube 5, so as to attract the magnetic powder particles 14 in the test tube 5 to a predetermined position (for example, the middle of the test tube 5, a mark can be set in the middle of the test tube 5 for easy operation, or the test tube 5 can be set to be transparent for direct observation of the position of the magnetic powder particles 14 in the test tube 5).

[0102] Optionally, a magnetic powder injector 15 is used to absorb a certain volume of magnetic powder particles 14, and the injection section of the magnetic powder injector 15 can extend into the middle of the test tube 5. The magnetic powder injector 15 can then be used to directly inject the magnetic powder particles 14 into place without having to adjust the position of the magnetic powder particles 14 in the test tube 5 through the magnet 16.

[0103] S3, fix the test tube 5 on the support assembly, and firmly fix the test tube 5 through the gland 6 support seat 7 to prevent relative movement between the test tube 5 and the magnetic source assembly during the test, so as to avoid parameter changes and thus affect the reliability of the data. Figure 5 As shown, the magnetic source assembly is aligned with the magnetic powder particles 14 in the test tube 5 to ensure that the magnetic field strength of the magnetic powder particles 14 reaches the target value, and the air inlet and outlet ends of the test tube 5 are respectively connected to the air source 1 and the flow detection component 13. At this point, the preliminary preparation of the magnetic powder seal test device is completed, and the parameters can be set according to the needs and the sealing performance of the magnetic powder seal can be tested.

[0104] S421 , adjusting the parameters of the magnetic source assembly to apply a magnetic field to the section where the magnetic powder particles 14 in the test tube 5 are located, and to reach a target value.

[0105] S422, adjust the pressure at the air inlet end of the test tube 5 to a first threshold value, connect the connecting pipe 4 between the test tube 5 and the flow detection component 13, obtain the air flow data of the flow detection component 13, and obtain the air flow data detected by the flow detection component 13 when there is no pressure.

[0106] S423, disconnect the connecting pipe 4 between the test tube 5 and the flow detection component 13 to block the air outlet end of the test tube 5, adjust the pressure at the air inlet end of the test tube 5 to compact the magnetic powder particles 14 in the test tube 5 under a preset compaction pressure, and after maintaining the pressure for T1 time, adjust the pressure at the air inlet end of the test tube 5 to a first threshold value, connect the connecting pipe 4 between the test tube 5 and the flow detection component 13, obtain the air flow data of the flow detection component 13, and obtain a first set of data associated with the compaction degree and the air flow data detected by the flow detection component 13

[0107] S424, repeat the previous step and gradually increase the pressure value of the preset compaction pressure to obtain the air flow data of the flow detection component 13 corresponding to different preset compaction pressures; obtain the second group, the third group, the fourth group...the nth group of different compaction degrees and the air flow data detected by the flow detection component 13.

[0108] S425, based on the air flow data of the flow detection component 13 corresponding to different preset compaction pressures, the relationship between the compaction degree of magnetic powder and the leakage rate of the magnetic powder seal is obtained. This can more systematically study and analyze the leakage rate of the magnetic powder seal at different compaction degrees, and facilitate the optimization of the magnetic powder seal structure in practical applications.

[0109] like Fig.10 As shown, in some embodiments, the magnetic powder seal test method of the embodiment of the present invention uses the magnetic powder seal test device in any of the above embodiments to test the magnetic powder seal, and the test method includes:

[0110] S1. Configure a test device for magnetic powder seal. Specifically, fix the magnetic source assembly on the support assembly, and use the connecting pipe 4 to pre-assemble and connect the gas source 1, flow detection component 13, pressure reducing valve 2, flow valve 3, control valve and other components so that they can be connected to the test tube 5 for testing at any time.

[0111] S2, injecting magnetic powder particles 14 into the test tube 5, and moving the magnetic powder particles 14 to a preset section in the test tube 5. When injecting the magnetic powder particles 14, Figures 2 to 4 As shown, a magnetic powder injector 15 can be used to absorb a certain volume of magnetic powder particles 14, which are injected into the test tube 5 from one end of the test tube 5, and then a magnet 16 is used to move close to the test tube 5, so as to attract the magnetic powder particles 14 in the test tube 5 to a predetermined position (for example, the middle of the test tube 5, a mark can be set in the middle of the test tube 5 for easy operation, or the test tube 5 can be set to be transparent for direct observation of the position of the magnetic powder particles 14 in the test tube 5).

[0112] Optionally, a magnetic powder injector 15 is used to absorb a certain volume of magnetic powder particles 14, and the injection section of the magnetic powder injector 15 can extend into the middle of the test tube 5. The magnetic powder injector 15 can then be used to directly inject the magnetic powder particles 14 into place without having to adjust the position of the magnetic powder particles 14 in the test tube 5 through the magnet 16.

[0113] S3, fix the test tube 5 on the support assembly, and firmly fix the test tube 5 through the gland 6 support seat 7 to prevent relative movement between the test tube 5 and the magnetic source assembly during the test, so as to avoid parameter changes and thus affect the reliability of the data. Figure 5 As shown, the magnetic source assembly is aligned with the magnetic powder particles 14 in the test tube 5 to ensure that the magnetic field strength of the magnetic powder particles 14 reaches the target value, and the air inlet and outlet ends of the test tube 5 are respectively connected to the air source 1 and the flow detection component 13. At this point, the preliminary preparation of the magnetic powder seal test device is completed, and the parameters can be set according to the needs and the sealing performance of the magnetic powder seal can be tested.

[0114] S431 , adjusting the parameters of the magnetic source assembly to apply a magnetic field to the section where the magnetic powder particles 14 in the test tube 5 are located, and to reach a target value.

[0115] S432, adjust the pressure value of the air inlet end of the test tube 5, connect the connecting pipe 4 between the test tube 5 and the flow detection component 13, obtain the air flow data of the flow detection component 13, and obtain the first set of magnetic field strength and air flow data detected by the flow detection component 13.

[0116] S433, increase or decrease the magnetic field strength applied by the magnetic source component to the section where the magnetic powder particles 14 in the test tube 5 are located, obtain the air flow data of the flow detection component 13 under the magnetic field strength, and obtain a second set of magnetic field strength and air flow data correlation data detected by the flow detection component 13.

[0117] S434, repeat the previous step to respectively obtain the air flow data of the flow detection component 13 corresponding to different magnetic field strengths, and obtain the third group, fourth group, ... nth group of associated data of different magnetic field strengths and the air flow data detected by the flow detection component 13.

[0118] S435, based on the air flow data of the flow detection component 13 corresponding to different magnetic field strengths, obtain the relationship between the magnetic powder strength and the leakage rate of the magnetic powder seal. This can more systematically study and analyze the leakage rate of the magnetic powder seal under different magnetic field strengths, and facilitate the optimization of the magnetic powder seal structure in practical applications.

[0119] like Fig.11As shown, in some embodiments, the magnetic powder seal test method of the embodiment of the present invention uses the magnetic powder seal test device in any of the above embodiments to test the magnetic powder seal, and the test method includes:

[0120] S1. Configure a test device for magnetic powder seal. Specifically, fix the magnetic source assembly on the support assembly, and use the connecting pipe 4 to pre-assemble and connect the gas source 1, flow detection component 13, pressure reducing valve 2, flow valve 3, control valve and other components so that they can be connected to the test tube 5 for testing at any time.

[0121] S2, injecting magnetic powder particles 14 into the test tube 5, and moving the magnetic powder particles 14 to a preset section in the test tube 5. When injecting the magnetic powder particles 14, Figures 2 to 4 As shown, a magnetic powder injector 15 can be used to absorb a certain volume of magnetic powder particles 14, which are injected into the test tube 5 from one end of the test tube 5, and then a magnet 16 is used to move close to the test tube 5, so as to attract the magnetic powder particles 14 in the test tube 5 to a predetermined position (for example, the middle of the test tube 5, a mark can be set in the middle of the test tube 5 for easy operation, or the test tube 5 can be set to be transparent for direct observation of the position of the magnetic powder particles 14 in the test tube 5).

[0122] Optionally, a magnetic powder injector 15 is used to absorb a certain volume of magnetic powder particles 14, and the injection section of the magnetic powder injector 15 can extend into the middle of the test tube 5. The magnetic powder injector 15 can then be used to directly inject the magnetic powder particles 14 into place without having to adjust the position of the magnetic powder particles 14 in the test tube 5 through the magnet 16.

[0123] S3, fix the test tube 5 on the support assembly, and firmly fix the test tube 5 through the gland 6 support seat 7 to prevent relative movement between the test tube 5 and the magnetic source assembly during the test, so as to avoid parameter changes and thus affect the reliability of the data. Figure 6 As shown, the magnetic source assembly is aligned with the magnetic powder particles 14 in the test tube 5 to ensure that the magnetic field strength of the magnetic powder particles 14 reaches the target value, and the air inlet and outlet ends of the test tube 5 are respectively connected to the air source 1 and the flow detection component 13. At this point, the preliminary preparation of the magnetic powder seal test device is completed, and the parameters can be set according to the needs and the sealing performance of the magnetic powder seal can be tested.

[0124] S441 , adjusting the parameters of the magnetic source assembly to apply a magnetic field to the section where the magnetic powder particles 14 in the test tube 5 are located, and to reach a target value.

[0125] S442, heating the section where the magnetic powder particles 14 in the test tube 5 are located to a first temperature and maintaining it for a time T2.

[0126] S443, adjust the pressure of the air inlet end of the test tube 5, connect the connecting pipe 4 between the test tube 5 and the flow detection component 13, obtain the air flow data of the flow detection component 13, and obtain the first set of temperature and air flow data detected by the flow detection component 13.

[0127] S444, increase or decrease the temperature of the section where the magnetic powder particles 14 in the test tube 5 are located, obtain the air flow data of the flow detection component 13 at this temperature, and obtain a second set of temperature and air flow data detected by the flow detection component 13.

[0128] S445, repeat the previous step to respectively obtain the air flow data of the flow detection component 13 corresponding to different temperatures; and obtain the third group, the fourth group, ... the nth group of associated data of the air flow data detected by the flow detection component 13 at different temperatures.

[0129] S446, based on the air flow data of the flow detection component 13 corresponding to different temperatures, the relationship between temperature and leakage rate of the magnetic powder seal is obtained, so that the leakage rate of the magnetic powder seal at different temperatures can be studied and analyzed more systematically, which is convenient for optimizing the magnetic powder seal structure in practical applications.

[0130] The embodiment of the present invention can deeply explore the specific influence of key factors such as pressure, temperature, compaction degree, magnetic field strength, etc. on the magnetic powder sealing effect based on a side view of the magnetic powder seal, which has extremely important reference value for the actual application scenarios of the magnetic powder seal.

[0131] The embodiment of the present invention can test the pressure resistance, temperature, and external magnetic field of the magnetic powder sealing device, conduct preliminary experimental research, and provide support for real sealing. This avoids the difficulty in accurately identifying the root cause of the problem when the seal fails in real situations, and it is impossible to determine whether it is a defect in the sealing component itself, or a seal leakage induced by other external factors, which in turn causes an increase in the maintenance cost of the sealing system and a waste of time. Secondly, the embodiment of the present invention studies the effect of the compaction degree of the magnetic powder on the seal, filling the gap in the current research direction, and proposes a visual test device, which realizes the visualization of the magnetic powder seal, so that key elements such as the state, distribution, and interaction of the magnetic powder in the sealing system can be intuitively displayed.

[0132] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0133] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0134] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0135] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0136] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0137] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A magnetic powder seal testing device, characterized in that: include: Support components; A test tube, the test tube having an air inlet end and an air outlet end, the test tube being detachably connected to the support assembly; A magnetic source component, the magnetic source component is connected to the support component, and the magnetic source component corresponds to a partial section of the test tube; A gas source, the gas source being connected to the gas inlet end of the test tube and being used to transport gas into the test tube; A flow detection component is connected to the gas outlet end of the test tube, and is used to detect the gas flow rate discharged from the gas outlet end of the test tube.

2. The magnetic powder seal testing device according to claim 1, characterized in that: The support assembly includes a base plate, a support seat and a pressure cover. The number of the support seats is at least two. The support seat is fixed to the base plate, the pressure cover is fixed to the support seat, and the test tube is fixed between the pressure cover and the support seat.

3. The magnetic powder seal testing device according to claim 1, characterized in that: The magnetic source assembly includes a first magnetic yoke, a second magnetic yoke and a magnetic component, the first magnetic yoke has a first working end, the second magnetic yoke has a second working end, the first working end and the second working end are arranged opposite to each other and form a yoke air gap, and a partial section of the test tube is located in the yoke air gap, and the magnetic component is arranged between the first magnetic yoke and the second magnetic yoke to form a magnetic field at the yoke air gap.

4. The magnetic powder seal testing device according to claim 1, characterized in that: It also includes a regulating component, which is arranged between the air source and the air inlet end of the test tube, and is used to adjust the air flow parameters flowing to the test tube; And / or, further comprising a control valve, wherein the control valve is disposed between the gas outlet end of the test tube and the flow detection component to control the connection or disconnection of the communication pipeline between the test tube and the flow detection component; And / or, the flow detection component is a flow meter; And / or, the air source is an air compressor.

5. The magnetic powder seal testing device according to claim 1, characterized in that: It also includes a heating sleeve and a temperature detection component. The heating sleeve is mounted on the test tube to heat a partial section of the test tube. The temperature detection component is used to detect the temperature of the heating sleeve.

6. A method for testing magnetic powder seal, characterized in that: The magnetic powder seal test device according to any one of claims 1 to 5 is used to test the magnetic powder seal, and the test method comprises: S1. A testing device for magnetic powder seals according to any one of claims 1 to 5; S2, injecting magnetic powder particles into the test tube, and moving the magnetic powder particles to a preset section in the test tube; S3, fixing the test tube on the support assembly, aligning the magnetic source assembly with the magnetic powder particles in the test tube, and connecting the air inlet and air outlet of the test tube to the air source and the flow detection component respectively; S4. Configure the parameters of the magnetic powder seal test device to apply a magnetic field to the section where the magnetic powder particles in the test tube are located through the magnetic source component, deliver pressurized gas to the air inlet end of the test tube through the air source, and obtain the leaked air flow through the flow detection component.

7. The method for testing magnetic powder seal according to claim 6, characterized in that: Step S4 includes the following steps: Adjusting the parameters of the magnetic source assembly to apply a magnetic field to the section where the magnetic powder particles in the test tube are located; Adjusting the pressure at the air inlet end of the test tube, connecting the connecting pipe between the test tube and the flow detection component, and obtaining the air flow data of the flow detection component; Increasing or decreasing the pressure at the air inlet end of the test tube, and acquiring air flow data of the flow detection component; Repeat the previous step to obtain the gas flow data of the flow detection component corresponding to different pressures; Based on the air flow data of the flow detection component corresponding to different pressures, the relationship between the pressure change and the leakage rate of the magnetic powder seal is obtained.

8. The method for testing magnetic powder seal according to claim 6, characterized in that: Step S4 includes the following steps: Adjusting the parameters of the magnetic source assembly to apply a magnetic field to the section where the magnetic powder particles in the test tube are located; Adjusting the pressure of the air inlet end of the test tube to a first threshold value, connecting the connecting pipe between the test tube and the flow detection component, and obtaining the air flow data of the flow detection component; Disconnect the connecting pipe between the test tube and the flow detection component to block the air outlet of the test tube, adjust the pressure of the air inlet end of the test tube to compact the magnetic powder particles in the test tube under a preset compaction pressure, and after maintaining the pressure for T1 time, adjust the pressure of the air inlet end of the test tube to a first threshold value, connect the connecting pipe between the test tube and the flow detection component, and obtain the air flow data of the flow detection component; Repeat the previous step and gradually increase the pressure value of the preset compaction pressure to obtain the air flow data of the flow detection component corresponding to different preset compaction pressures; Based on the air flow data of the flow detection component corresponding to different preset compaction pressures, the relationship between the compaction degree of the magnetic powder and the leakage rate of the magnetic powder seal is obtained.

9. The method for testing magnetic powder seal according to claim 6, characterized in that: Step S4 includes the following steps: Adjusting the parameters of the magnetic source assembly to apply a magnetic field to the section where the magnetic powder particles in the test tube are located; Adjusting the pressure value of the air inlet end of the test tube, connecting the connecting pipe between the test tube and the flow detection component, and obtaining the air flow data of the flow detection component; Increasing or decreasing the magnetic field strength applied by the magnetic source component to the section where the magnetic powder particles in the test tube are located, and obtaining the air flow data of the flow detection component under the magnetic field strength; Repeat the previous step to respectively obtain the air flow data of the flow detection component corresponding to different magnetic field strengths; Based on the air flow data of the flow detection component corresponding to different magnetic field intensities, the relationship between the magnetic powder strength and the leakage rate of the magnetic powder seal is obtained.

10. The method for testing magnetic powder seal according to claim 1, characterized in that: Step S4 includes the following steps: Adjusting the parameters of the magnetic source assembly to apply a magnetic field to the section where the magnetic powder particles in the test tube are located; The section where the magnetic powder particles in the test tube are located is heated to a first temperature and maintained for a time T2; Adjusting the pressure at the air inlet end of the test tube, connecting the connecting pipe between the test tube and the flow detection component, and obtaining the air flow data of the flow detection component; Increasing or decreasing the temperature of the section where the magnetic powder particles in the test tube are located, and obtaining the air flow data of the flow detection component at the temperature; Repeat the previous step to respectively obtain the air flow data of the flow detection component corresponding to different temperatures; Based on the corresponding air flow data of the flow detection component at different temperatures, the relationship between the temperature and the leakage rate of the magnetic powder seal is obtained.

Images