Method and system for injecting a magnetic fluid into a magnetic powder seal

Abstract

The application discloses a kind of magnetic powder sealing device's magnetic powder liquid state injection method and system, magnetic powder sealing device's magnetic powder liquid state injection method includes: casing is set on the shaft, the relative position of casing and shaft is adjusted;Magnetic powder sealing assembly is set on the shaft, and magnetic powder sealing assembly is assembled to casing inside;Magnetic powder and volatile material are mixed to form liquid state magnetic powder dispersion liquid, and magnetic powder dispersion liquid is injected into sealing gap;Magnetic powder dispersion liquid is heated, and magnetic powder sealing assembly and shaft are driven to rotate relatively, until volatile material in magnetic powder dispersion liquid volatilizes.The application is mixed with volatile material and magnetic powder to improve the flowability of magnetic powder, so that it is convenient to inject magnetic powder dispersion liquid uniformly at sealing gap, and then volatile material is volatilized by heating, and finally converted into uniformly distributed magnetic powder O-ring, to ensure the safety and reliability of magnetic powder sealing.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of sealing, and particularly relates to a magnetic powder liquid state injection method and system of a magnetic powder sealing device. BACKGROUND

[0002] Magnetic powder sealing is a sealing form taking magnetic particles as the main body, and forming a magnetic powder (hereinafter referred to as "magnetic powder") as a sealing medium after modification by a surface lubricant, a lubricant, etc. Compared with other sealing modes in the related art, the magnetic powder sealing has a series of advantages such as low leakage rate, high pressure resistance, high and low temperature resistance, high speed resistance, etc., and plays an important role in many fields such as solid rocket engines, gas turbines, etc.

[0003] In the application of magnetic powder sealing, due to poor flowability of the magnetic powder material, a uniform and complete sealing ring structure cannot be formed in the sealing gap after using the injection method in the related art, a complete "O-shaped" sealing ring structure that can effectively provide sealing pressure resistance cannot be formed, and the pressure resistance and leakage rate of the magnetic powder sealing will be affected, and even the sealing effect will be lost. SUMMARY

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

[0005] To this end, an embodiment of the present application proposes a magnetic powder liquid state injection method of a magnetic powder sealing device capable of improving the uniformity of magnetic powder dispersion and having good sealing effect.

[0006] An embodiment of the present application further proposes a magnetic powder liquid state injection system.

[0007] The magnetic powder liquid state injection method of the magnetic powder sealing device of the embodiment of the present application, the magnetic powder sealing device comprising a rotating shaft, a shell and a magnetic powder sealing assembly, the shell and the magnetic powder sealing assembly being sleeved on the rotating shaft and being rotatable relative to the rotating shaft, the magnetic powder sealing assembly comprising a pole shoe and a magnetic source, the magnetic source being connected with the pole shoe, and the pole shoe and the rotating shaft having an annular sealing gap therebetween for filling magnetic powder;

[0008] The magnetic powder liquid state injection method comprises:

[0009] S1, sleeving the shell on the rotating shaft, and adjusting the relative position of the shell and the rotating shaft;

[0010] S2, sleeving the magnetic powder sealing assembly on the rotating shaft, and assembling the magnetic powder sealing assembly into the shell;

[0011] S3, mixing magnetic powder and volatile material to form a liquid state magnetic powder dispersion liquid, and injecting the magnetic powder dispersion liquid into the sealing gap;

[0012] S4, heating the magnetic powder dispersion liquid, and driving the magnetic powder sealing assembly and the rotating shaft to rotate relative to each other until the volatile material in the magnetic powder dispersion liquid is volatilized.

[0013] The embodiment of the present application improves the flowability of the magnetic powder by mixing the volatile material and the magnetic powder, thereby facilitating uniform injection of the magnetic powder dispersion liquid at the sealing gap, and finally converting into a uniformly distributed magnetic powder O-ring through volatilization of the volatile material by heating, thereby guaranteeing the safety and reliability of the magnetic powder seal.

[0014] In some embodiments, the step of assembling the magnetic powder sealing assembly into the shell comprises:

[0015] connecting a first end cover to one end of the shell, feeding the magnetic powder sealing assembly into the inner cavity of the shell from the end of the shell away from the first end cover, and abutting the magnetic powder sealing assembly against the first end cover, and connecting a second end cover to the end of the shell away from the first end cover to fixedly connect the shell and the magnetic powder sealing assembly.

[0016] In some embodiments, sealing components are arranged between the first end cover, the second end cover, and the rotating shaft to seal the inner cavity of the shell, and air vents are arranged on the first end cover and the second end cover.

[0017] In the step of heating the magnetic powder dispersion liquid, a safe gas is introduced into the inner cavity of the shell through at least part of the air vents, and the volatile volatile material is carried out through the other air vents, until the volatile material is volatilized and there is no volatile material in the discharged safe gas.

[0018] In some embodiments, the liquid-state injection method of the magnetic powder further comprises:

[0019] S5, introducing a safe gas into the inner cavity of the shell through at least part of the air vents, closing the other air vents, and making the air pressure in the inner cavity of the shell reach a preset pressure threshold to compact the magnetic powder filled in the sealing gap.

[0020] In some embodiments, the safe gas is nitrogen.

[0021] In some embodiments, a heat transfer groove is arranged on the circumferential outer side of the pole shoe, and a medium inlet and a medium outlet corresponding to the heat transfer groove are arranged on the shell.

[0022] The step of heating the magnetic powder dispersion liquid comprises:

[0023] A high-temperature medium is introduced into the heat transfer groove through the medium inlet, and the medium in the heat transfer groove is discharged through the medium outlet.

[0024] The rotating shaft is driven to rotate.

[0025] acquire a temperature in the inner cavity of the shell, keep the temperature not less than a preset temperature threshold, and stop feeding the high-temperature medium into the heat transfer groove after a preset time threshold is reached.

[0026] The magnetic powder liquid-state injection system in the embodiment of the application is used for injecting magnetic powder into a sealing gap between a pole shoe and a rotating shaft in a magnetic powder sealing device, and comprises:

[0027] First and second end covers, which are used for connecting with a shell in the magnetic powder sealing device and are connected at two ends of the shell in the axial direction of the rotating shaft respectively to fix a magnetic powder sealing assembly in the magnetic powder sealing device;

[0028] An injection assembly, which is used for mixing magnetic powder and volatile material and injecting a liquid-state magnetic powder dispersion formed after mixing into the sealing gap between the pole shoe and the rotating shaft in the magnetic powder sealing device;

[0029] A heating assembly, which is used for heating the liquid-state magnetic powder dispersion injected into the magnetic powder sealing device.

[0030] In some embodiments, the first and second end covers each have a threaded segment, the first and second end covers are connected with the shell through the threaded segments, and a sealing ring is arranged on an end face of the first end cover abutting against the shell and on an end face of the second end cover abutting against the shell.

[0031] In some embodiments, a sealing ring is arranged on a wall surface of the first end cover corresponding to the rotating shaft and on a wall surface of the second end cover corresponding to the rotating shaft, and an air vent is arranged on the first and second end covers.

[0032] The magnetic powder liquid-state injection system further comprises a gas supply assembly, which is used for connecting with at least part of the air vents to feed a safe gas into an inner cavity of the shell.

[0033] In some embodiments, a heat transfer groove is further arranged, which is arranged on a circumferential side wall of the pole shoe in the magnetic powder sealing device, forms a heat transfer cavity with the shell, and is in communication with the heat transfer cavity to feed a high-temperature medium into the heat transfer cavity. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 is a schematic diagram of a state after injection of the magnetic powder dispersion in the embodiment of the application.

[0035] Figure 2is a schematic diagram of the state of the magnetic powder dispersion liquid after heating in the embodiment of the present application.

[0036] Figure 3 is a schematic diagram of the arrangement of the first end cover and the second end cover in the embodiment of the present application.

[0037] Figure 4 is a schematic diagram of the state change of the magnetic powder dispersion liquid after heating in the embodiment of the present application.

[0038] Reference signs:

[0039] 1, rotating shaft;

[0040] 2, housing; 21, medium inlet; 22, medium outlet;

[0041] 31, first end cover; 32, second end cover; 33, vent hole;

[0042] 4, pole shoe; 41, heat transfer groove;

[0043] 5, magnetic source;

[0044] 6, magnetic isolation ring;

[0045] 7, sealing ring;

[0046] 8, magnetic powder. DETAILED DESCRIPTION

[0047] The embodiments of the present application are described in detail below, examples of which are shown in the accompanying drawings. The embodiments described below by referring to the accompanying drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0048] As shown in Figures 1-4 , the magnetic powder liquid state injection method of the magnetic powder sealing device in the embodiment of the present application, wherein the magnetic powder sealing device comprises a rotating shaft 1, a housing 2 and a magnetic powder sealing assembly, the housing 2 and the magnetic powder sealing assembly are sleeved on the rotating shaft 1 and are rotatable relative to the rotating shaft 1, the magnetic powder sealing assembly comprises a pole shoe 4 and a magnetic source 5, the magnetic source 5 is connected with the pole shoe 4, and the pole shoe 4 has an annular sealing gap with the rotating shaft 1 for filling the magnetic powder 8, as shown in Figure 1 , the pole shoe 4 has a plurality of pole teeth, each of which can form an O-shaped magnetic powder sealing ring with the rotating shaft 1. The magnetic source 5 can provide a magnetic force for the pole shoe 4, so that the magnetic powder is stably dispersed at the sealing gap. After the magnetic powder sealing assembly is assembled to the housing 2, the relative positions of the magnetic powder sealing assembly, the housing 2 and the rotating shaft 1 can be stabilized, so as to facilitate the injection of the magnetic powder.

[0049] The magnetic powder liquid state injection method specifically comprises:

[0050] S1, the shell 2 is sleeved on the rotating shaft 1, the relative position of the shell 2 and the rotating shaft 1 is adjusted, and in assembly, the relative position of the shell and the rotating shaft can be fixed after the shell and the rotating shaft are aligned and fixed on the base equipment.

[0051] S2, the magnetic powder sealing assembly is sleeved on the rotating shaft 1, and the magnetic powder sealing assembly is assembled into the shell 2, specifically, the magnetic powder sealing assembly can be fixed through the connecting piece or the limiting piece or the like assembling piece arranged on the shell 2, so that the assembly position of the magnetic powder sealing assembly on the shell 2 is determined, at this time, the relative position between the magnetic powder sealing assembly and the rotating shaft 1 is stable, and subsequent magnetic powder injection operation is facilitated.

[0052] S3, the magnetic powder and the volatile material are mixed to form a liquid-state magnetic powder dispersion liquid, the magnetic powder dispersion liquid is injected into the sealing gap, and in normal assembly operation, the volatile material is in a liquid state, and the volatile material can volatilize into a gaseous state in a high-temperature environment, for example, the volatile material can be water, dichloromethane, ethanol, diethyl ether or the like. As a liquid dispersant, the volatile material and the magnetic powder can be mixed and stirred to form a liquid-state magnetic powder dispersion liquid, which can improve the fluidity of the magnetic powder and facilitate uniform injection into the sealing gap during injection, and the dispersion is more uniform and consistent, and a complete O-shaped sealing ring is formed.

[0053] The mixing and stirring of the magnetic powder and the volatile material can be performed by arranging a stirring device, the injection pipe and the pumping device are arranged, the discharge end of the injection pipe extends to the sealing gap, and the magnetic powder dispersion liquid is pumped into the sealing gap through the injection pipe.

[0054] S4, the magnetic powder dispersion liquid is heated, and the magnetic powder sealing assembly and the rotating shaft 1 are driven to rotate relative to each other until the volatile material in the magnetic powder dispersion liquid volatilizes. In the heating process, the volatile material volatilizes into a gaseous state under the action of heat, and the magnetic powder remains in the sealing gap. Since the rotating shaft 1 rotates synchronously during the heating process, the liquid-state magnetic powder dispersion liquid in the sealing gap can be continuously disturbed, the uniformity of the final converted magnetic powder O-shaped ring is improved, and the reliability of the magnetic powder sealing is ensured.

[0055] During heating, the pole shoe 4 or the rotating shaft 1 can be heated, the inner cavity of the shell can be heated, heat can be transferred to the liquid-state magnetic powder dispersion liquid, or the temperature of the environment in which the rotating shaft 1, the shell 2 and the magnetic powder sealing assembly as a whole are located can be changed to realize volatilization of the volatile material.

[0056] The embodiment of the application improves the fluidity of the magnetic powder by mixing the volatile material and the magnetic powder, thereby facilitating uniform injection of the magnetic powder dispersion liquid into the sealing gap, and finally converting the volatile material into a uniformly distributed magnetic powder O-shaped ring by heating to volatilize the volatile material, thereby ensuring the safety and reliability of the magnetic powder sealing.

[0057] In some embodiments, the step of assembling the magnetic powder sealing assembly into the housing 2 includes connecting a first end cover 31 at one end of the housing 2, feeding the magnetic powder sealing assembly into the inner cavity of the housing 2 from the end of the housing 2 away from the first end cover 31, and abutting the magnetic powder sealing assembly with the first end cover 31, and connecting a second end cover 32 at the end of the housing 2 away from the first end cover 31 to fix the housing 2 and the magnetic powder sealing assembly. By assembling the first end cover 31 and the second end cover 32 on the housing 2, the first end cover 31 and the second end cover 32 are used to limit and clamp the magnetic powder sealing assembly, thereby ensuring accurate positioning of the magnetic powder sealing assembly.

[0058] Further, the first end cover 31 and the second end cover 32 are both provided with a sealing member between the first end cover 31 and the second end cover 32 and the rotating shaft 1 to seal the inner cavity of the housing 2. The sealing member is a rubber sealing ring 7. The first end cover 31 and the second end cover 32 are provided with a vent 33. The number of the vents 33 on the first end cover 31 and the second end cover 32 can be one or more. In step S4, when the magnetic powder dispersion liquid is heated, the safe gas is introduced into the inner cavity of the housing 2 through part of the vents 33. The safe gas can be nitrogen. The safe gas carrying the volatile material is discharged through the other vents 33 until the volatile material is completely volatilized and there is no volatile material in the discharged safe gas.

[0059] That is, when the magnetic powder dispersion liquid is heated, the volatile material is volatilized into a gaseous state. By introducing the safe gas into the inner cavity of the housing 2, the safe gas is used to replace the gas in the inner cavity of the housing 2, and the safe gas carrying the volatile material is discharged from part of the vents 33 and then discharged after being treated in a safe area. In this embodiment, the gaseous volatile material is discharged safely, which can be applied to occasions with high requirements for the surrounding environment, avoids the random overflow of the volatile material after heating, prevents pollution to the sealed inner cavity and the surrounding environment, and ensures normal operation of the equipment.

[0060] In application, the safe gas can be introduced through part of the vents 33 of the first end cover 31, the safe gas carrying the volatile material is discharged through the other vents 33 of the first end cover 31, the safe gas is introduced through part of the vents 33 of the second end cover 32, and the safe gas carrying the volatile material is discharged through the other vents 33 of the second end cover 32.

[0061] Referring to Figures 1 to 4 Another specific embodiment of the method for injecting the magnetic powder liquid state of the magnetic powder sealing device according to the embodiment of the present application will be described in detail.

[0062] The magnetic powder sealing device comprises a rotating shaft 1, a shell 2 and a magnetic powder sealing assembly, the shell 2 and the magnetic powder sealing assembly are sleeved on the rotating shaft 1 and are rotatable relative to the rotating shaft 1, the magnetic powder sealing assembly comprises a pole shoe 4, a magnetic source 5 and a magnetic shielding ring 6, the number of the pole shoes 4 is two, the pole teeth of the pole shoes 4 and the rotating shaft 1 have an annular sealing gap for filling the magnetic powder, the magnetic source 5 is connected with the pole shoes 4, the magnetic source 5 is arranged between the two pole shoes 4, the magnetic shielding ring 6 is arranged on the side of the pole shoes 4 away from the magnetic source 5 in the axial direction of the rotating shaft 1, the magnetic source 5 can simultaneously provide magnetic force for the two pole shoes 4, so that the magnetic powder is stably dispersed at the sealing gap. After the magnetic powder sealing assembly is assembled to the shell 2, the relative positions of the magnetic powder sealing assembly, the shell 2 and the rotating shaft 1 are stable, so that the injection of the magnetic powder is facilitated.

[0063] In the embodiment, a sealing ring 7 is arranged between the outer peripheral wall surface of the pole shoe 4 and the shell 2, so as to ensure the sealing between the pole shoe 4 and the shell 2. A heat transfer groove 41 is arranged on the circumferential outer side of the pole shoe 4, and a medium inlet 21 and a medium outlet 22 corresponding to the heat transfer groove 41 are arranged on the shell 2, and the medium inlet 21 and the medium outlet 22 are in communication with the heat transfer groove 41.

[0064] The method for injecting the magnetic powder in a liquid state into the magnetic powder sealing device specifically comprises the following steps.

[0065] S1, the shell 2 is sleeved on the rotating shaft 1, and the relative positions of the shell 2 and the rotating shaft 1 are adjusted.

[0066] S2, the magnetic powder sealing assembly is sleeved on the rotating shaft 1, and the magnetic powder sealing assembly is assembled into the shell 2. Specifically, a first end cover 31 is connected to one end of the shell 2, the first end cover 31 is threadedly connected with the shell 2, according to the arrangement sequence of the magnetic shielding ring 6, the pole shoe 4 and the magnetic source 5 in the magnetic powder sealing assembly, the magnetic shielding ring 6 can be sent into the inner cavity of the shell 2 alone, and the pole shoe 4 and the magnetic source 5 can be sent into the inner cavity of the shell 2 after being connected together by magnetic force, for example, Figure 1 the arrangement mode of the magnetic powder sealing assembly shown in the above formula (1) is magnetic shielding ring 6, pole shoe 4, magnetic source 5, pole shoe 4, magnetic shielding ring 6, and the assembly sequence is magnetic shielding ring 6, a sealing structure member composed of two pole shoes 4 and a magnetic source 5, magnetic shielding ring 6. When the pole shoe, the shell, the first end cover, the second end cover and other components have sealing grooves, the sealing rings need to be arranged in the corresponding sealing grooves in advance, so as to keep the inner cavity sealed after assembly. After the components are sequentially assembled in the above sequence, a second end cover 32 is connected to the end of the shell 2 away from the first end cover 31, so as to fixedly connect the shell 2 and the magnetic powder sealing assembly, the second end cover 32 is also threadedly connected with the shell 2, so as to ensure that the assembly position of the magnetic powder sealing assembly on the shell 2 is determined, and the relative positions between the magnetic powder sealing assembly and the rotating shaft 1 are stable, which facilitates the subsequent operation of injecting the magnetic powder.

[0067] S3, the magnetic powder and the volatile material are mixed to form a liquid-state magnetic powder dispersion liquid, the magnetic powder dispersion liquid is injected into the sealing gap, the volatile material is in a liquid state during normal assembly operation, and the volatile material can volatilize into a gaseous state in a high-temperature environment, for example, the volatile material can be water, methanol, etc. After the volatile material and the magnetic powder are mixed and stirred, a liquid-state magnetic powder dispersion liquid can be formed, the flowability of the magnetic powder can be improved relative to pure magnetic powder, the magnetic powder dispersion liquid can be conveniently and uniformly injected into the sealing gap during injection, the dispersion is more uniform, and a complete O-ring is formed.

[0068] S4, the magnetic powder dispersion liquid is heated, and the magnetic powder sealing assembly and the rotating shaft 1 are driven to rotate relative to each other until the volatile material in the magnetic powder dispersion liquid volatilizes. Specifically, high-temperature medium is introduced into the heat transfer groove 41 through the medium inlet 21 on the shell 2, and the medium in the heat transfer groove 41 is discharged through the medium outlet 22. The high-temperature medium can heat the pole shoe 4 and increase the temperature in the inner cavity. At this time, the volatile material in the magnetic powder dispersion liquid will volatilize into a gaseous state, and the magnetic powder will remain in the sealing gap. While heating, the rotating shaft 1 is driven to rotate, ensuring that the magnetic powder dispersion liquid is in a flowing state. During the continuous volatilization of the volatile material, the uniformity of the magnetic powder distribution is improved, the uniformity of the final converted magnetic powder O-ring is improved, and the reliability of the magnetic powder seal is ensured.

[0069] Further, the first end cover 31 and the second end cover 32 are provided with a sealing ring 7 between the shell 2, and the first end cover 31 and the second end cover 32 are also provided with a sealing ring 7 between the rotating shaft 1, so that the inner cavity of the shell 2 is sealed, and the gaseous volatile material can be prevented from overflowing out. One air vent 33 can be provided on the first end cover 31 and the second end cover 32, or a plurality of air vents 33 can be provided; while the magnetic powder dispersion liquid is heated, a safe gas is introduced into the inner cavity of the shell 2 through part of the air vents 33, wherein the safe gas can be nitrogen, and the volatile volatile material carried by the safe gas is discharged through other air vents 33 until the volatile material is completely volatilized and there is no volatile material in the discharged safe gas.

[0070] The first end cover 31 and the second end cover 32 are used as a tool, and after the magnetic powder is injected, the first end cover 31 and the second end cover 32 are removed. Of course, it can also be used as a component of the magnetic powder sealing device and not removed, or only one of them is removed.

[0071] The embodiment of the present application can control the heating time by detecting the temperature and gas in the shell 2, for example, by obtaining the temperature in the inner cavity of the shell 2, keeping the temperature not less than a preset temperature threshold, and stopping the high-temperature medium from being input into the heat transfer groove 41 after the duration reaches a preset time threshold, and ensuring the complete volatilization of the volatile material within the duration of the preset time threshold. For another example, by detecting whether the safety gas discharged from the inner cavity of the shell 2 carries the volatile material, when the safety gas does not carry the volatile material, the heating can be stopped.

[0072] The preset temperature threshold is determined according to the temperature at which the volatile material is converted from a liquid state to a gaseous state, and the preset temperature threshold is 5 to 15 degrees Celsius higher than the temperature at which the volatile material is converted from a liquid state to a gaseous state; and the preset time threshold can be 10 to 45 minutes.

[0073] In the embodiment, the safety gas is input into the inner cavity of the shell 2, the safety gas is used to replace the gas in the inner cavity of the shell 2, and the safety gas carrying the volatile material is discharged from the partial air port 33 and introduced into a safety area for treatment before being discharged, so that the magnetic powder liquid injection method of the embodiment of the present application can be applied to occasions with high requirements on the surrounding environment, the volatile material after heating is prevented from being randomly scattered and spilled, pollution to the sealed inner cavity and the surrounding environment is prevented, and normal operation of the equipment is ensured.

[0074] In application, the safety gas can be input into the inner cavity of the shell 2 through the air port 33 on the first end cover 31, the safety gas carrying the volatile material can be discharged from the air port 33 on the second end cover 32, or the safety gas can be input into the partial air port 33 of the first end cover 31, the safety gas carrying the volatile material can be discharged from the other air port 33 of the first end cover 31, the safety gas can be input into the partial air port 33 of the second end cover 32, and the safety gas carrying the volatile material can be discharged from the other air port 33 of the second end cover 32.

[0075] S5, after the volatile material is discharged, the safety gas is input into the inner cavity of the shell 2 through at least part of the air ports 33, the other air ports 33 are closed, the air pressure in the inner cavity of the shell 2 reaches a preset pressure threshold, and the magnetic powder filled in the sealing gap is compacted.

[0076] Compared with the injection method in the related art, the embodiment of the application disperses the sealing magnetic powder with poor fluidity and difficult to be stably distributed into the volatile material to form a magnetic powder dispersion liquid with good fluidity, and injects into the pole teeth of the pole shoe 4, so that the magnetic powder can be uniformly distributed along the circumferential direction of the rotating shaft 1, and further, the inner cavity of the shell 2 is heated through the heat transfer groove 41 of the pole shoe 4, while the rotating shaft 1 keeps rotating, the volatile material in the magnetic powder dispersion liquid can continuously volatilize, and the uniformly distributed magnetic powder O-ring is finally converted into the uniformly distributed magnetic powder O-ring. The embodiment of the application further introduces the safety gas to take out the volatile material from the sealed inner cavity, thereby ensuring the safety and reliability of the magnetic powder sealing. Further, by increasing the pressure of the safety gas, the magnetic powder in the sealing gap can be compacted to extrude the air between the magnetic powder particles, thereby improving the density of the sealing magnetic powder, effectively reducing the leakage rate of the magnetic powder sealing, and ensuring the reliability of the magnetic powder sealing.

[0077] The embodiment of the application avoids the problem of uneven distribution of magnetic powder and large porosity caused by directly injecting the magnetic powder, effectively improves the pressure resistance of the magnetic powder sealing, and reduces the leakage rate of the magnetic powder sealing.

[0078] The following describes a magnetic powder liquid-state injection system of the embodiment of the application for injecting the magnetic powder into the sealing gap between the pole teeth of the pole shoe 4 and the rotating shaft 1 in the magnetic powder sealing device, which comprises a first end cover 31, a second end cover 32, an injection assembly, a heating assembly and a gas supply assembly.

[0079] The first end cover 31 and the second end cover 32 are used to be connected with the shell 2 in the magnetic powder sealing device, and the first end cover 31 and the second end cover 32 are respectively connected at the two ends of the shell 2 in the axial direction of the rotating shaft 1 to fix the magnetic powder sealing assembly in the magnetic powder sealing device; the first end cover and the second end cover both have a threaded section, the first end cover 31 and the second end cover 32 are both screwed with the shell 2 through the threaded sections, the end surface of the first end cover abutting against the shell, the end surface of the second end cover abutting against the shell are both provided with a sealing ring, and the wall surface of the first end cover corresponding to the rotating shaft, the wall surface of the second end cover corresponding to the rotating shaft are both provided with a sealing ring, in other words, the sealing ring 7 is arranged between the first end cover 31 and the shell 2, between the second end cover 32 and the shell 2, and between the first end cover 31 and the second end cover 32 and the rotating shaft 1, so as to seal the inner cavity of the shell 2, and make the magnetic powder sealing assembly in the sealed inner cavity.

[0080] The injection assembly is used to mix the magnetic powder and the volatile material, and inject the liquid-state magnetic powder dispersion liquid formed after mixing into the sealing gap between the pole teeth of the pole shoe 4 and the rotating shaft 1 in the magnetic powder sealing device.

[0081] The heating assembly is used for heating the liquid state magnetic powder dispersion liquid between the pole teeth of the pole shoe 4 and the rotating shaft 1 injected into the magnetic powder sealing device, the heat transfer grooves 41 are arranged on the circumferential side wall of the pole shoe 4 in the magnetic powder sealing device, the heat transfer grooves 41 and the shell 2 form a heat transfer cavity, the heating assembly is communicated with the heat transfer cavity to introduce high-temperature medium into the heat transfer cavity, and then the temperature in the inner cavity of the shell 2 is increased.

[0082] The first end cover 31 and the second end cover 32 are provided with air vents 33, and the gas assembly is used for being connected with at least part of the air vents 33 to introduce the safe gas into the inner cavity of the shell 2, and the safe gas can carry the volatile material in the gaseous state and can improve the compactness of the magnetic powder by adjusting the air pressure in the inner cavity.

[0083] The magnetic powder liquid state injection system in the embodiment of the application can implement the magnetic powder liquid state injection method of the magnetic powder sealing device in the above embodiment, and the beneficial effects that can be achieved by the magnetic powder liquid state injection system in the embodiment of the application are the same as the beneficial effects that can be achieved by the magnetic powder liquid state injection method of the magnetic powder sealing device in the above embodiment, and thus are not described again.

[0084] In the description of the application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the application.

[0085] In addition, the terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first", "second" can explicitly or implicitly include at least one of the features. In the description of the application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0086] In the present application, unless specifically defined otherwise, the terms "mounting", "connected", "connecting", "fixed", "fixedly connected", "connection", "fixedly connected", "connected", "fixed", and the like should be construed broadly, for example, can be fixed connection, can be detachable connection, or integral; can be mechanical connection, can be electrical connection or communication with each other; can be directly connected, or indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise specifically defined. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0087] In the present application, unless specifically defined otherwise, the first feature is "on" or "under" the second feature. The first and second features can be in direct contact, or the first and second features can be in indirect contact through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the first feature is higher than the second feature in horizontal height. The first feature "below", "under" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the first feature is lower than the second feature in horizontal height.

[0088] In the present application, the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or examples described in the specification and the features of different embodiments or examples without contradiction.

[0089] Although the embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and cannot be construed as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the present application.

Claims

1. A method for injecting liquid magnetic powder into a magnetic powder sealing device, characterized in that: The magnetic powder sealing device includes a rotating shaft, a housing, and a magnetic powder sealing assembly. The housing and the magnetic powder sealing assembly are sleeved on the rotating shaft and rotatable relative to the rotating shaft. The magnetic powder sealing assembly includes a pole shoe and a magnetic source. The magnetic source is connected to the pole shoe. An annular sealing gap is provided between the pole shoe and the rotating shaft for filling magnetic powder. The magnetic powder liquid injection method comprises: S1. Sleeve the housing onto the rotating shaft and adjust the relative position of the housing and the rotating shaft; S2. Sleeve the magnetic powder sealing assembly on the rotating shaft and assemble the magnetic powder sealing assembly into the housing; S3, mixing the magnetic powder and the volatile material to form a liquid magnetic powder dispersion, and injecting the magnetic powder dispersion into the sealed gap; S4, heating the magnetic powder dispersion, and driving the magnetic powder sealing assembly and the rotating shaft to rotate relative to each other until the volatile material in the magnetic powder dispersion is volatilized; The step of assembling the magnetic powder seal assembly into the housing comprises: Connecting a first end cap to one end of the housing, inserting the magnetic powder sealing assembly into the inner cavity of the housing from the end of the housing away from the first end cap, and making the magnetic powder sealing assembly abut against the first end cap, and connecting a second end cap to the end of the housing away from the first end cap to securely connect the housing and the magnetic powder sealing assembly; A sealing component is provided between the first end cover and the second end cover and the rotating shaft to seal the inner cavity of the housing, and a vent is provided on the first end cover and the second end cover; When heating the magnetic powder dispersion, a safety gas is introduced into the inner cavity of the housing through some of the vents, and the safety gas carries the volatilized volatile material and is discharged through other vents until the volatile material is completely volatilized and no volatile material is left in the discharged safety gas; The magnetic powder liquid injection method further comprises: S5. Introduce safety gas into the inner cavity of the shell through at least some of the vents, close the other vents, and make the air pressure in the inner cavity of the shell reach a preset pressure threshold to compact the magnetic powder filled in the sealed gap.

2. The method for injecting liquid magnetic powder into a magnetic powder sealing device according to claim 1, characterized in that: The safety gas is nitrogen.

3. The method for injecting liquid magnetic powder into a magnetic powder sealing device according to claim 1 or 2, characterized in that: A heat transfer groove is arranged on the circumferential outer side of the pole shoe, and a medium inlet and a medium outlet corresponding to the heat transfer groove are arranged on the shell; The step of heating the magnetic powder dispersion comprises: A high-temperature medium is introduced into the heat transfer groove from the medium inlet, and the medium in the heat transfer groove is discharged from the medium outlet; driving the rotating shaft to rotate; The temperature in the inner cavity of the shell is obtained, the temperature is maintained to be not less than a preset temperature threshold, and the introduction of high-temperature medium into the heat transfer groove is stopped after the duration reaches a preset time threshold.

4. The method for injecting liquid magnetic powder into a magnetic powder sealing device according to claim 1, characterized in that: The invention also includes a magnetic powder liquid injection system, which is used to inject magnetic powder into the sealing gap between the pole shoe and the rotating shaft in the magnetic powder sealing device to implement the magnetic powder liquid injection method of the magnetic powder sealing device. The magnetic powder liquid injection system includes: a first end cover and a second end cover, wherein the first end cover and the second end cover are used to be connected to the housing in the magnetic powder sealing device, and the first end cover and the second end cover are respectively connected to the housing at both ends of the axial direction of the rotating shaft to fix the magnetic powder sealing assembly in the magnetic powder sealing device; An injection assembly, the injection assembly being used to mix magnetic powder and volatile material and inject the liquid magnetic powder dispersion formed after the mixture into the sealing gap between the pole shoe and the rotating shaft in the magnetic powder sealing device; A heating component is used to heat the liquid magnetic powder dispersion injected into the space between the pole piece and the rotating shaft in the magnetic powder sealing device.

5. The method for injecting liquid magnetic powder into a magnetic powder sealing device according to claim 4, characterized in that: The first end cover and the second end cover both have threaded sections, and the first end cover and the second end cover are connected to the shell through the threaded sections. Sealing rings are provided on the end faces where the first end cover abuts the shell and the end faces where the second end cover abuts the shell.

6. The method for injecting liquid magnetic powder into a magnetic powder sealing device according to claim 5, characterized in that: A sealing ring is provided on the wall surface of the first end cover corresponding to the rotating shaft and the wall surface of the second end cover corresponding to the rotating shaft, and a vent is provided on the first end cover and the second end cover; The magnetic powder liquid injection system further includes a gas supply component, which is used to be connected to at least part of the vents to introduce safety gas into the inner cavity of the shell.

7. The method for injecting liquid magnetic powder into a magnetic powder sealing device according to claim 4, characterized in that: It also includes a heat transfer groove, which is opened on the circumferential side wall of the pole shoe in the magnetic powder sealing device. A heat transfer cavity is formed between the heat transfer groove and the shell. The heating component is connected to the heat transfer cavity to introduce high-temperature medium into the heat transfer cavity.

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