An electromagnetic winding type magnetohydrodynamic sealing device

Abstract

This utility model discloses an electromagnetic winding type magnetofluid sealing device, including a shaft, a rotating ring, a stationary ring, and a sealing assembly. The sealing assembly is disposed between the rotating ring and the stationary ring. The sealing assembly includes an electromagnetic coil a and an electromagnetic coil b, both of which are equipped with energized coils. A sealed flow channel is formed between the energized coil a and the electromagnetic coil b. Magnetofluid is disposed within the sealed flow channel. The magnetofluid is replenished through a filling channel or flows out through a discharge port. This utility model can replenish the magnetofluid without disassembling the sealing device, and improves the utilization rate of the sealing space and reduces leakage through a magnetofluid sealing combined with a labyrinth sealing method.

Description

Technical Field

[0001] This utility model relates to magnetohydrodynamic sealing technology, and more particularly to an electromagnetic winding type magnetohydrodynamic sealing device. Background Technology

[0002] Patent public account CN118856002A and patent publication number CN118856001A describe a typical magnetic fluid sealing device, which has advantages such as non-contact sealing with zero wear and high stability. However, the magnetic fluid used for sealing is easily lost during use and is difficult to replenish effectively. It mainly uses permanent magnets to adsorb magnetic fluid, and the magnetic force is not adjustable. When replenishing magnetic fluid, it is easily affected by nearby magnetic field interference, making it difficult to effectively replenish the magnetic fluid filling area at a distance.

[0003] CN113154046A discloses a magnetic fluid replenishment scheme for a magnetic fluid seal, which mainly uses a pressing piston combined with centrifugal force to replenish the magnetic fluid. However, in this magnetic fluid replenishment scheme, the nearby magnetic field interferes with the replenishment of the magnetic fluid to the distant magnetic field during the replenishment process, thus limiting the replenishment area. Furthermore, the pressing piston replenishment scheme makes it difficult to accurately and quantitatively replenish the magnetic fluid. This invention uses a combination of rotary extrusion, centrifugal force, and magnetic field control to achieve sufficient replenishment of the magnetic fluid. Summary of the Invention

[0004] The purpose of this invention is to provide a magnetic fluid sealing technology based on electromagnetic adsorption of magnetic fluid, which is an electromagnetic winding type magnetic fluid sealing device that can suppress leakage and blockage while facilitating the replenishment of magnetic fluid.

[0005] The purpose of this utility model is achieved as follows: An electromagnetic winding type magnetohydrodynamic sealing device includes a shaft, a rotating ring, a stationary ring, and a sealing assembly. The sealing assembly is provided between the rotating ring and the stationary ring. The sealing assembly includes an electromagnetic coil a and an electromagnetic coil b. Both electromagnetic coil a and electromagnetic coil b are provided with energized coils. A sealed flow channel is formed between the energized coil a and electromagnetic coil b. Magnetohydrodynamic fluid is provided in the sealed flow channel. The magnetohydrodynamic fluid is replenished through a filling channel or flows out through a discharge port.

[0006] As a further preferred embodiment of this utility model, a plurality of sealing rings are provided on the stationary ring, and an energizing hole is provided on one side of the stationary ring, the energizing hole being connected to an energizing coil.

[0007] As a further preferred embodiment of this utility model, an isolation shell is provided on the outside of the energized coil.

[0008] As a further preferred embodiment of this utility model, the moving ring is divided into a positive brush area and a negative brush area, and a storage chamber is provided between the positive brush area and the shaft, with a permanent magnet ring provided on the side of the storage chamber; the storage chamber stores magnetic fluid.

[0009] As a further preferred embodiment of this utility model, the storage chamber is connected to the filling channel, and a branch of the filling channel is connected to the sealing assembly and to the sealing top screw mounting area, wherein the sealing top screw mounting area is embedded with the sealing top screw.

[0010] As a further preferred embodiment of this utility model, a propulsion ring is provided on the shaft, and the propulsion ring compresses the storage chamber by advancing the shaft axially.

[0011] As a further preferred embodiment of this utility model, supplementary holes are provided on the end faces of the energized coil and the isolation shell respectively.

[0012] As a further preferred embodiment of this utility model, a locking area is provided on the moving ring, and a locking nut mounting area is provided outside the locking area, on which a locking nut is installed.

[0013] As a further preferred embodiment of this utility model, the propulsion ring includes a propulsion ring nut at the rear end, a thread in the middle, and a rubber ring at the front end.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0015] 1. Compared with the previous magnetic fluid sealing solution, this solution adopts a magnetic fluid sealing combined with a labyrinth seal, which improves the utilization efficiency of the sealing space and enhances the leakage prevention effect of the magnetic fluid seal.

[0016] 2. Magnetic fluid replenishment can be achieved without disassembling the machine. Existing magnetic fluid sealing magnetic fluid replenishment schemes mainly use a pressing piston combined with centrifugal force to replenish magnetic fluid. However, during the magnetic fluid replenishment process, the nearby magnetic field will interfere with the magnetic fluid replenishment of the distant magnetic field, limiting the magnetic fluid replenishment area. Furthermore, the pressing piston replenishment scheme is difficult to achieve sufficient magnetic fluid replenishment. This utility model uses an electromagnetic coil to control the opening and closing of the magnetic field to achieve sufficient magnetic fluid replenishment.

[0017] 3. By using electromagnetic force to achieve the adsorption of magnetic fluid, the pressure resistance limit of magnetic fluid seals is increased compared to permanent magnet magnetic fluid sealing technology.

[0018] 4. The sealing effect is not affected by the shaft speed. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the technical description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a structural diagram of the main body of the electromagnetic winding magnetohydrodynamic sealing device.

[0021] Figure 2 This is a structural schematic diagram of the moving ring and shaft.

[0022] Figure 3 for Figure 2 A cross-sectional schematic diagram of the structure.

[0023] Figure 4 This is a schematic diagram of the state of an electromagnetic coil adsorbing a magnetofluid.

[0024] Figure 5 for Figure 1 Schematic diagram of propulsion ring operation based on the basic principle Figure 1 .

[0025] Figure 6 for Figure 1 Schematic diagram of propulsion ring operation based on the basic principle Figure 2 .

[0026] Figure 7 for Figure 1 A schematic diagram of the magnetofluid supplementation effect based on the above.

[0027] Figure 8 This is a schematic diagram of an electromagnetic coil.

[0028] Figure 9 This is a schematic diagram of the isolation shell.

[0029] Figure 10 A schematic diagram of the propulsion ring.

[0030] Figure 11 Schematic diagram of another electromagnetic coil winding method Figure 1 .

[0031] Figure 12 Schematic diagram of another electromagnetic coil winding method Figure 2 .

[0032] Among them, 1-shaft, 2-moving ring, 3-locking nut, 4-stationary ring, 5-sealing ring, 6-replenishment hole, 7-filling channel, 8-electromagnetic coil a, 9-electromagnetic coil b, 10-outlet, 11-sealing flow channel, 12-permanent magnet ring, 13-storage chamber, 14-energizing hole, 15-magnetic fluid, 16-energizing coil, 17-isolation shell, 18-sealing set screw, 19-positive brush area, 20-negative brush area, 21-locking area, 22-locking nut mounting area, 23-sealing set screw mounting area, 24-propulsion ring, 25-propulsion ring nut, 26-thread, 27-rubber ring, 28-sealing ring mounting area, 29-positive electrical hole, 30-negative electrical hole, 31-suspension column. Detailed Implementation

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0034] like Figure 1-12 As shown, an electromagnetic winding type magnetohydrodynamic sealing device includes a shaft 1, a rotating ring 2, a stationary ring 4, and a sealing assembly. The sealing assembly is disposed between the rotating ring 2 and the stationary ring 4. The sealing assembly includes an electromagnetic coil a8 and an electromagnetic coil b9. Both the electromagnetic coil a8 and the electromagnetic coil b9 are provided with energized coils 16. A sealed flow channel 11 is formed between the energized coil a8 and the electromagnetic coil b9. Magnetohydrodynamic fluid 15 is disposed in the sealed flow channel 11. The magnetohydrodynamic fluid 15 is replenished through a filling channel 7 or flows out through a discharge port 10.

[0035] Preferably, the stationary ring 4 is provided with a plurality of sealing rings 5, and an energizing hole 14 is provided on one side of the stationary ring 4, the energizing hole 14 being connected to the energizing coil 16.

[0036] Preferably, an isolation shell 17 is provided on the outside of the energized coil 16.

[0037] Preferably, the moving ring 2 is divided into a positive brush area 19 and a negative brush area 20. A storage chamber 13 is provided between the positive brush area 19 and the shaft 1. A permanent magnet ring 12 is provided on the side of the storage chamber 13. The storage chamber 13 stores a magnetic fluid 15.

[0038] Preferably, the storage chamber 13 is connected to the filling channel 7, and a branch of the filling channel 7 is connected to the sealing assembly and to the sealing top screw mounting area 23, wherein the sealing top screw mounting area 23 is embedded with the sealing top screw 18.

[0039] Preferably, a propulsion ring 24 is provided on the shaft 1, and the propulsion ring 24 propels the storage chamber 13 axially along the shaft 1.

[0040] Preferably, supplementary holes 6 are provided on the end faces of the energized coil 16 and the isolation shell 17 respectively.

[0041] Preferably, a locking area 21 is provided on the moving ring 2, and a locking nut mounting area 22 is provided outside the locking area 21, on which a locking nut 3 is mounted.

[0042] Preferably, the propulsion ring 24 includes a rear propulsion ring nut 25, a middle thread 26, and a front rubber ring 27. Example

[0043] The electromagnetic coil described in the article can be considered as a coil with multiple turns of current carried around the outside of multiple sets of metal magnetic rings of different sizes.

[0044] Electromagnetic coils a8 and b9 combine in a sealed space to form a three-dimensional "I"-shaped labyrinth seal, creating a sealed flow channel 11. Before the addition of magnetic fluid, this structure can be considered a labyrinth seal.

[0045] When the energized coil 16 of electromagnetic coils a8 and b9 is energized, the N or S poles of the electromagnet are formed at both ends of the electromagnetic coils. Under the action of the magnetic field, a strong magnetic field is formed in the gap between electromagnetic coils a8 and b9, which can attract the injected magnetic fluid. Since the magnetic fluid has electrical conductivity, an electromagnetic coil isolation shell 17 is provided on the outside of the electromagnetic coil to prevent the magnetic fluid from directly contacting the energized coil 16. Furthermore, by cooperating with multiple sets of electromagnetic coils a8 and b9 of different sizes, the magnetic fluid can be attracted within the "I-shaped" sealing channel 11 of the labyrinth seal, achieving a magnetic fluid sealing effect.

[0046] It is worth noting that since the magnitude and direction of the electromagnetic field are affected by the current in the energized coil, the magnetic field region inside the sealed equipment can be changed. Example

[0047] The magnetic fluid replenishment method of this utility model is as follows: This utility model has a moving ring 2, a locking area 21 at the end of the moving ring, a magnetic fluid storage chamber 13 inside the moving ring, a sealing ring installation area inside the moving ring, a magnetic fluid outlet 10, and a magnetic fluid filling channel 7. When the electromagnetic coil is de-energized, this device does not generate a magnetic field and will not have an adsorption or blocking effect on the magnetic fluid. When filling the magnetic fluid, it starts from the magnetic fluid storage chamber 13 inside the moving ring, which is referred to as the magnetic fluid 15 located in the storage chamber; then the magnetic fluid propulsion ring 24 starts to screw in, squeezing the magnetic fluid 15 into the magnetic fluid filling channel 7, and then replenishes the magnetic fluid in the flow channel through the magnetic fluid outlet 10, the magnetic fluid replenishment hole 6 located on the magnetic core of the electromagnetic coil, and the magnetic fluid replenishment hole 6 located on the isolation shell of the electromagnetic coil. After the magnetic fluid replenishment is completed, the energized coil is connected to the DC power supply to achieve the magnetic fluid sealing effect.

[0048] It is worth noting that a rubber ring 27 is provided at the end of the magnetofluid propulsion ring to prevent magnetofluid leakage while compressing the magnetofluid.

[0049] It is worth noting that the magnetofluid has fluidity. To prevent the magnetofluid from flowing out of the magnetofluid storage chamber 13, a permanent magnet ring 12 is installed inside the moving ring 2.

[0050] It is worth noting that multiple sets of corresponding magnetic fluid filling channels 7, magnetic fluid discharge outlets 10, magnetic fluid replenishment holes 6 located on the magnetic core of the electromagnetic coil, magnetic fluid replenishment holes 6 located on the isolation shell of the electromagnetic coil, and sealing top screw mounting areas 23 need to be opened.

[0051] It is worth noting that a conductive coating is provided on the side of the moving ring 2 near the positive electrode brush area 19, and a conductive coating is provided on the side of the moving ring 2 near the negative electrode brush area 20, but there is a gap between the two layers and they are not connected.

[0052] Considering the processing issues, the magnetic fluid filling channel 7 is made by drilling a hole in the sealing top screw mounting area 23 and opening a hole on the end face of the magnetic fluid storage chamber 13 inside the moving ring during radial processing, and the sealing top screw 18 is used to seal the sealing top screw mounting area 23 after the hole is opened. Example

[0053] By changing the winding method of the electromagnetic coil described above, the direction of the electromagnet poles can be changed. The winding method can improve the utilization rate of the magnetic fluid sealing channel, but the electromagnetic strength will be reduced under the same voltage conditions. Example

[0054] The stationary ring 4, the rotating ring 2, and the suspension column 31 can form a non-contact gap to constitute a fluid channel. When the fluid flows through the gap, it is obstructed by the suspension column 31 and splits into two thin streams in opposite directions. Under the guidance of the flow channel, the two thin streams collide after circling the suspension column 31 once. This process consumes the kinetic energy of the flowing fluid to achieve a first-level leakage suppression effect. This leakage suppression method that consumes the kinetic energy of the fluid through multiple collisions is a non-contact self-impact sealing form. Several combinations of electromagnetic coils are set on the side wall of the flow channel. The addition of electromagnetic coils makes the initially formed non-contact self-impact sealing form superimposed. After the energized coil 16 is energized again, the N or S pole of the electromagnet will be formed at both ends of the electromagnetic coil. Under the action of the magnetic field, a strong magnetic field is formed in the gap between electromagnetic coil a8 and electromagnetic coil b9 to attract the injected magnetic fluid.

[0055] The combination of self-impact seals and magnetohydrodynamic (MHD) seals maximizes the sealing performance of MHD seals. By adding MHD seals to the self-impact seal, the self-impact seal can achieve better sealing performance with larger sealing gaps, significantly improving pressure resistance.

[0056] The above description is only a specific embodiment of this utility model, but the protection scope of the utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of the utility model.

Claims

1. An electromagnetic winding type magnetohydrodynamic sealing device, characterized in that, The device includes a shaft (1), a moving ring (2), a stationary ring (4), and a sealing assembly. The sealing assembly is provided between the moving ring (2) and the stationary ring (4). The sealing assembly includes an electromagnetic coil a (8) and an electromagnetic coil b (9). Both the electromagnetic coil a (8) and the electromagnetic coil b (9) are provided with energized coils (16). A sealed flow channel (11) is formed between the energized coil a (8) and the electromagnetic coil b (9). A magnetic fluid (15) is provided in the sealed flow channel (11). The magnetic fluid (15) is replenished through the filling channel (7) or flows out through the discharge port (10).

2. The electromagnetic winding type magnetohydrodynamic sealing device according to claim 1, characterized in that: A number of sealing rings (5) are provided on the stationary ring (4), and an energizing hole (14) is provided on one side of the stationary ring (4). The energizing hole (14) is connected to the energizing coil (16).

3. The electromagnetic winding type magnetohydrodynamic sealing device according to claim 1, characterized in that: An isolation shell (17) is provided on the outside of the energized coil (16).

4. The electromagnetic winding type magnetohydrodynamic sealing device according to claim 1, characterized in that: The moving ring (2) is divided into a positive brush area (19) and a negative brush area (20). A storage chamber (13) is set between the positive brush area (19) and the shaft (1). A permanent magnet ring (12) is set on the side of the storage chamber (13). The storage chamber (13) stores a magnetic fluid (15).

5. The electromagnetic winding type magnetohydrodynamic sealing device according to claim 4, characterized in that: The storage chamber (13) is connected to the filling channel (7), and a branch of the filling channel (7) is connected to the sealing assembly and to the sealing top screw mounting area (23), where the sealing top screw (23) is embedded with the sealing top screw (18).

6. The electromagnetic winding type magnetohydrodynamic sealing device according to claim 1, characterized in that: A propulsion ring (24) is provided on the shaft (1), and the propulsion ring (24) propels the compression storage chamber (13) axially along the shaft (1).

7. The electromagnetic winding type magnetohydrodynamic sealing device according to claim 1, characterized in that: Supplementary holes (6) are provided on the end faces of the energized coil (16) and the isolation shell (17).

8. The electromagnetic winding type magnetohydrodynamic sealing device according to claim 1, characterized in that: A locking area (21) is provided on the moving ring (2), and a locking nut installation area (22) is provided outside the locking area (21). A locking nut (3) is installed on the locking nut installation area (22).

9. The electromagnetic winding type magnetohydrodynamic sealing device according to claim 6, characterized in that: The propulsion ring (24) includes a rear propulsion ring nut (25), a middle thread (26), and a front rubber ring (27).

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