Dynamic sealing device combining magnetofluid sealing and spring compensation

Abstract

The utility model provides a dynamic sealing device combining magnetofluid sealing and spring compensation, and relates to the technical field of magnetofluid sealing. According to the utility model, when the moving shaft rotates, the magnetofluid is fixed in the magnetofluid groove by the magnetofluid sealing assembly through a magnetic field generated by the magnet, so that a stable sealing layer is formed, medium leakage is prevented, and meanwhile, the sealing effect is further enhanced by the sealing screen; the spring compensation assembly pushes the connecting block and the first sealing ring to slide along the first limiting groove through the elastic force of the telescopic spring, so that the sealing ring is in close contact with the movable shaft all the time, gap changes caused by abrasion or vibration are automatically compensated, the supporting block and the connecting block are matched through the second limiting groove, and stable movement of the sealing ring is ensured; the whole device realizes efficient sealing and automatic adjustment under a dynamic working condition, and is suitable for high-speed rotating machinery and precision equipment.

Description

TECHNICAL FIELD

[0001] The utility model relates to magnetic fluid sealing technical field especially relates to a dynamic sealing device of magnetic fluid sealing and spring compensation combination. BACKGROUND

[0002] The dynamic sealing device of magnetic fluid sealing and spring compensation combination aims at solving the failure problem of traditional sealing under high speed and high pressure, and the magnetic fluid sealing utilizes the magnetic field to fix the magnetic liquid to form a sealing layer, and the spring compensation adjusts the sealing gap through the elastic element to ensure the stability and reliability under the dynamic working condition, and is suitable for high-speed rotating machinery and precision equipment.

[0003] However, in actual use, there are still the following deficiencies, for example: the existing dynamic sealing device of magnetic fluid sealing and spring compensation combination cannot realize efficient sealing and automatic adjustment under dynamic working condition, under the dynamic working condition, such as rotation or vibration of equipment, if the magnetic fluid sealing cannot work efficiently, the magnetic fluid may not form a stable and uniform sealing barrier in the sealing gap, resulting in leakage of working medium, and the leaked working medium may enter other parts of the equipment, causing wear and corrosion of parts, at the same time, due to the poor sealing effect, impurities from outside are more likely to enter the equipment, accelerating the wear of the equipment and shortening the service life of the equipment.

[0004] Therefore, the utility model provides a dynamic sealing device of magnetic fluid sealing and spring compensation combination to solve the above problems. UTILITY MODEL CONTENTS

[0005] The utility model aims at solving the shortcomings in the prior art and provides a dynamic sealing device of magnetic fluid sealing and spring compensation combination.

[0006] In order to achieve the above object, the utility model adopts the following technical scheme: a dynamic sealing device of magnetic fluid sealing and spring compensation combination, comprising:

[0007] A shaft sleeve;

[0008] A magnetic fluid sealing assembly is arranged in the interior of the shaft sleeve, the magnetic fluid sealing assembly comprises a rotating shaft arranged in the interior of the shaft sleeve, a magnet is fixed in the interior of the shaft sleeve, a magnetic fluid groove is formed in the rotating shaft, and a sealing screen is arranged on the rotating shaft;

[0009] A spring compensation assembly is arranged inside the shaft sleeve, the spring compensation assembly comprises a second supporting ring fixed inside the shaft sleeve, an elastic spring is fixed on the second supporting ring, a connecting block is fixed on one end of the elastic spring away from the second supporting ring, a first sealing ring is fixed on the connecting block, a first limiting groove is arranged on the shaft sleeve, the first sealing ring is slidably connected in the first limiting groove, a sealing ring is fixed on the connecting block, and a supporting block is rotatably connected on the driving shaft, a second limiting groove is arranged on one side of the supporting block close to the connecting block, and the connecting block is arranged in the second limiting groove.

[0010] Further, the inside of the shaft sleeve is fixed with a first supporting ring, the first supporting ring is fixed with a bearing, and the driving shaft is arranged in the bearing.

[0011] The beneficial effect of the above further scheme is that the first supporting ring is fixed inside the shaft sleeve to support the bearing, the bearing is installed in the first supporting ring, the driving shaft passes through the bearing and cooperates with it, which ensures the smooth rotation of the driving shaft, reduces friction and vibration, and improves the operation stability and service life of the device.

[0012] Further, a rubber pad is fixed on one side of the sealing screen close to the driving shaft.

[0013] The beneficial effect of the above further scheme is that the rubber pad is fixed on one side of the sealing screen close to the driving shaft to enhance the contact sealing effect between the sealing screen and the driving shaft, the elasticity of the rubber pad can adapt to the slight vibration and eccentricity of the driving shaft, prevent medium leakage, and reduce wear and tear.

[0014] Further, a first bolt is threadedly connected to the sealing screen, and the first bolt is threadedly connected to the driving shaft.

[0015] The beneficial effect of the above further scheme is that the first bolt is threadedly connected to fix the sealing screen on the driving shaft, which ensures the stable relative position between the sealing screen and the driving shaft, and this connection mode is convenient for disassembly and maintenance, and can withstand the axial force and radial force generated during rotation of the driving shaft.

[0016] Further, a second bolt is threadedly connected to the supporting block.

[0017] The beneficial effect of the above further scheme is that the second bolt is threadedly connected to fix the supporting block on the flange plate, which ensures the stable relative position between the supporting block and the shaft sleeve, and this connection mode can withstand the axial force generated by the spring compensation assembly, and is convenient for adjustment and maintenance.

[0018] Further, a flange plate is fixed on one side of the shaft sleeve close to the second bolt, and the second bolt is threadedly connected to the flange plate.

[0019] The beneficial effect of the further scheme is that the flange is fixed on the shaft sleeve and is used for supporting and fixing the second bolt, the flange enhances the structural strength of the shaft sleeve, and meanwhile provides a stable installation basis for the spring compensation assembly, and ensures the reliability of the device under dynamic working conditions.

[0020] Further, the second sealing ring is fixed on the side of the shaft sleeve away from the flange.

[0021] The beneficial effect of the further scheme is that the second sealing ring is fixed on the side of the shaft sleeve away from the flange, and is used for enhancing the sealing effect between the shaft sleeve and the dynamic shaft, and the second sealing ring can prevent external impurities from entering the inside of the shaft sleeve, and ensures the sealing performance of the device under harsh environments.

[0022] Compared with the prior art, the device has the advantages and positive effects that:

[0023] In the device, when the dynamic shaft rotates, the magnetic fluid sealing assembly fixes the magnetic fluid in the magnetic fluid groove through the magnetic field generated by the magnet, forms a stable sealing layer, and prevents medium leakage; meanwhile, the sealing screen further enhances the sealing effect; the spring compensation assembly pushes the connecting block and the first sealing ring to slide along the first limiting groove through the elastic force of the extension spring, so that the sealing ring always keeps close contact with the dynamic shaft, automatically compensates the gap change caused by abrasion or vibration, and the supporting block and the connecting block are matched through the second limiting groove, so as to ensure the stable movement of the sealing ring; the overall device realizes efficient sealing and automatic adjustment under dynamic working conditions, and is suitable for high-speed rotating machinery and precision equipment. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 FIG. 1 is a structural schematic view of a dynamic sealing device with magnetic fluid sealing and spring compensation combination of the utility model;

[0025] Figure 2 FIG. 2 is a dynamic shaft structure schematic view of the dynamic sealing device with magnetic fluid sealing and spring compensation combination of the utility model;

[0026] Figure 3 FIG. 3 is a shaft sleeve structure schematic view of the dynamic sealing device with magnetic fluid sealing and spring compensation combination of the utility model;

[0027] Figure 4 FIG. 4 is a shaft sleeve structure sectional view of the dynamic sealing device with magnetic fluid sealing and spring compensation combination of the utility model;

[0028] Figure 5 FIG. 5 is a dynamic shaft structure side view of the dynamic sealing device with magnetic fluid sealing and spring compensation combination of the utility model.

[0029] REFERENCE SIGNS:

[0030] 1, shaft sleeve;

[0031] 2. Magnetorheological fluid sealing assembly; 21. Moving shaft; 22. Magnet; 23. First support ring; 24. Bearing; 25. Magnetorheological fluid groove; 26. Sealing screen; 27. Rubber gasket; 28. First bolt;

[0032] 3. Spring compensation assembly; 31. Second support ring; 32. Telescopic spring; 33. Connecting block; 34. First sealing ring; 35. First limiting groove; 36. Sealing ring; 37. Support block; 38. Second limiting groove; 39. Second bolt; 310. Flange; 311. Second sealing ring. 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 of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0034] like Figures 1-5 As shown, this embodiment provides a technical solution: a dynamic sealing device combining magnetohydrodynamic sealing and spring compensation, comprising:

[0035] Bushing 1;

[0036] The magnetic fluid sealing assembly 2 is placed inside the bushing 1. The magnetic fluid sealing assembly 2 includes a moving shaft 21 disposed inside the bushing 1. A magnet 22 is fixed inside the bushing 1. A magnetic fluid groove 25 is opened inside the moving shaft 21. A sealing screen 26 is disposed on the moving shaft 21.

[0037] The spring compensation assembly 3 is arranged in the shaft sleeve 1, the spring compensation assembly 3 comprises a second support ring 31 fixed in the shaft sleeve 1, an extension spring 32 is fixed on the second support ring 31, a connecting block 33 is fixed on one end of the extension spring 32 away from the second support ring 31, a first sealing ring 34 is fixed on the connecting block 33, a first limiting groove 35 is arranged on the shaft sleeve 1, the first sealing ring 34 is slidably connected in the first limiting groove 35, a sealing ring 36 is fixed on the connecting block 33, a support block 37 is rotatably connected on the driving shaft 21, a second limiting groove 38 is arranged on one side of the support block 37 close to the connecting block 33, the connecting block 33 is arranged in the second limiting groove 38, when the driving shaft 21 rotates, the magnetic fluid sealing assembly 2 fixes the magnetic fluid in the magnetic fluid groove 25 through the magnetic field generated by the magnet 22, forming a stable liquid sealing layer, the magnetic fluid has high stability and fluidity under the action of the magnetic field, at the same time, the sealing screen 26 further enhances the sealing effect through its structure, the rubber pad 27 on it is in close contact with the driving shaft 21, adapts to the slight vibration and eccentricity of the driving shaft 21, further reduces the risk of leakage, the spring compensation assembly 3 pushes the connecting block 33 and the first sealing ring 34 to slide along the first limiting groove 35 through the elastic force of the extension spring 32, so that the sealing ring 36 is always in close contact with the driving shaft 21, so that the gap change caused by wear or vibration due to long-term operation can be automatically compensated, the durability and stability of the sealing effect are ensured, the support block 37 cooperates with the connecting block 33 through the second limiting groove 38 to limit the movement range of the connecting block 33, ensure the stability of the movement track of the sealing ring 36, avoid the sealing failure caused by eccentricity or vibration, the whole device combines the high efficiency of the magnetic fluid sealing and the automatic adjustment ability of the spring compensation, realizes efficient sealing under high-speed rotation and dynamic working condition, it is suitable for high-speed rotating machinery, precision equipment and sealing occasions requiring high reliability and stability, can effectively cope with the sealing challenge under complex working conditions, prolongs the service life of the equipment and reduces the maintenance cost.

[0038] In the above scheme, the device cannot effectively cope with mechanical stress and vibration under complex working conditions under the condition of high-speed rotation and dynamic working condition, such as Figures 1-2 and Figure 5As shown: A first support ring 23 is fixed inside the bushing 1, and a bearing 24 is fixed inside the first support ring 23. The moving shaft 21 is set inside the bearing 24. The first support ring 23 is fixed inside the bushing 1, providing a stable mounting base for the bearing 24. The bearing 24 is installed inside the first support ring 23, and the moving shaft 21 passes through the bearing 24 and cooperates with it, ensuring that the moving shaft 21 can rotate smoothly. The bearing 24 reduces the friction and vibration between the moving shaft 21 and the bushing 1, improving the operational stability and service life of the device. It is particularly suitable for high-speed rotation and dynamic working conditions. A rubber pad 27 is fixed on the side of the sealing screen 26 near the moving shaft 21. The rubber pad 27 is fixed on the side of the sealing screen 26 near the moving shaft 21, utilizing its elastic properties to increase the friction and vibration between the moving shaft 21 and the bearing 24. The strong sealing screen 26 and the moving shaft 21 have a good contact sealing effect. The rubber gasket 27 can adapt to the slight vibration and eccentricity of the moving shaft 21, prevent media leakage, and reduce wear caused by friction, thus improving the reliability and durability of the seal. It is suitable for high-precision and high-speed rotating equipment. The sealing screen 26 is threaded with a first bolt 28, which is threaded onto the moving shaft 21. The first bolt 28 fixes the sealing screen 26 to the moving shaft 21 through the threaded connection, ensuring the relative position between the sealing screen 26 and the moving shaft 21 is stable. This connection method is not only easy to disassemble and maintain, but also can withstand the axial and radial forces generated when the moving shaft 21 rotates, ensuring the stability and sealing performance of the sealing screen 26 under dynamic working conditions.

[0039] like Figures 1-5 As shown, a second bolt 39 is threaded onto the support block 37. The second bolt 39 fixes the support block 37 to the flange 310 via the threaded connection, ensuring the relative position stability between the support block 37 and the bushing 1. This connection method can withstand the axial force generated by the spring compensation assembly 3, and is also convenient for adjustment and maintenance. The second bolt 39 enhances the stability of the support block 37, ensuring the reliable operation of the sealing ring 36 under dynamic conditions. A flange 310 is fixed to the side of the bushing 1 near the second bolt 39. The second bolt 39 is threaded onto the flange 310, and the flange 310 is fixed to the bushing 1 to support and fix the second bolt 39. 9. Flange 310 provides a stable mounting base for spring compensation assembly 3, ensuring the reliability of the device under high-speed rotation and dynamic working conditions. It can effectively cope with mechanical stress and vibration under complex working conditions. A second sealing ring 311 is fixed on the side of the bushing 1 away from the flange 310. The second sealing ring 311 is fixed on the side of the bushing 1 away from the flange 310 to enhance the sealing effect between the bushing 1 and the moving shaft 21. The second sealing ring 311 can prevent external impurities from entering the interior of the bushing 1, ensuring the sealing performance of the device in harsh environments and improving the overall sealing reliability of the device. It is suitable for industrial environments with high pollution or high precision requirements.

[0040] like Figures 1-5As shown, when the rotating shaft 21 rotates, the magnetic fluid sealing assembly 2 fixes the magnetic fluid in the magnetic fluid groove 25 through the magnetic field generated by the magnet 22, forming a stable liquid sealing layer, and the magnetic fluid has high stability and fluidity under the action of the magnetic field. At the same time, the sealing screen 26 further enhances the sealing effect through its structure, and the rubber pad 27 on it is in close contact with the rotating shaft 21, which can adapt to the slight vibration and eccentricity of the rotating shaft 21, further reducing the risk of leakage. The spring compensation assembly 3 pushes the connecting block 33 and the first sealing ring 34 along the first limiting groove 35 through the elastic force of the extension spring 32, so that the sealing ring 36 is always in close contact with the rotating shaft 21, which can automatically compensate for the gap change caused by wear or vibration due to long-term operation, ensuring the durability and stability of the sealing effect. The support block 37 cooperates with the connecting block 33 through the second limiting groove 38 to limit the movement range of the connecting block 33, ensuring the stability of the movement track of the sealing ring 36, avoiding sealing failure caused by eccentricity or vibration. The first support ring 23 is fixed inside the shaft sleeve 1 to provide a stable installation basis for the bearing 24. The bearing 24 is installed in the first support ring 23, and the rotating shaft 21 passes through and cooperates with the bearing 24 to ensure that the rotating shaft 21 can rotate smoothly, reducing friction and vibration, and improving the running stability and life of the device. The first bolt 28 fixes the sealing screen 26 on the rotating shaft 21 through threaded connection, ensuring the stability of the relative position between the sealing screen 26 and the rotating shaft 21, facilitating disassembly and maintenance. The second bolt 39 fixes the support block 37 on the flange plate 310 through threaded connection, ensuring the stability of the relative position between the support block 37 and the shaft sleeve 1, facilitating adjustment and maintenance. The flange plate 310 is fixed on the shaft sleeve 1 to provide a stable installation basis for the spring compensation assembly 3, ensuring the reliability of the device under dynamic working conditions. The second sealing ring 311 is fixed on the side of the shaft sleeve 1 away from the flange plate 310, which is used to enhance the sealing effect between the shaft sleeve 1 and the rotating shaft 21, prevent external impurities from entering the inside of the shaft sleeve 1, and ensure the sealing performance of the device in harsh environments.

[0041] The above is only a preferred embodiment of the present application, and is not intended to limit the present application in other forms. Any skilled person in the art can modify or change the above disclosed technical content to equivalent embodiments applied to other fields, but any simple modification, equivalent change and modification made on the basis of the technical essence of the present application to the above embodiments shall fall within the protection scope of the present application.

Claims

1. A dynamic sealing device combining magnetohydrodynamic sealing and spring compensation, characterized in that, include: Bushing (1); A magnetic fluid sealing assembly (2) is placed inside a bushing (1). The magnetic fluid sealing assembly (2) includes a movable shaft (21) disposed inside the bushing (1). A magnet (22) is fixed inside the bushing (1). A magnetic fluid groove (25) is opened inside the movable shaft (21). A sealing screen (26) is provided on the movable shaft (21). A spring compensation assembly (3) is placed inside a bushing (1). The spring compensation assembly (3) includes a second support ring (31) fixed inside the bushing (1). A telescopic spring (32) is fixed on the second support ring (31). A connecting block (33) is fixed on one end of the telescopic spring (32) away from the second support ring (31). A first sealing ring (34) is fixed on the connecting block (33). A first limiting groove (35) is provided on the bushing (1). The first sealing ring (34) is slidably connected in the first limiting groove (35). A sealing ring (36) is fixed on the connecting block (33). A support block (37) is rotatably connected on the moving shaft (21). A second limiting groove (38) is provided on one side of the support block (37) near the connecting block (33). The connecting block (33) is located in the second limiting groove (38).

2. The dynamic sealing device combining magnetohydrodynamic sealing and spring compensation according to claim 1, characterized in that: The bushing (1) has a first support ring (23) fixed inside, and a bearing (24) is fixed inside the first support ring (23). The moving shaft (21) is located inside the bearing (24).

3. The dynamic sealing device combining magnetohydrodynamic sealing and spring compensation according to claim 1, characterized in that: A rubber pad (27) is fixed on the side of the sealing screen (26) near the moving shaft (21).

4. The dynamic sealing device combining magnetohydrodynamic sealing and spring compensation according to claim 1, characterized in that: The sealing screen (26) is threaded with a first bolt (28), which is threaded onto the moving shaft (21).

5. A dynamic sealing device combining magnetohydrodynamic sealing and spring compensation according to claim 1, characterized in that: The support block (37) is threaded with a second bolt (39).

6. A dynamic sealing device combining magnetohydrodynamic sealing and spring compensation according to claim 5, characterized in that: A flange (310) is fixed on the side of the bushing (1) near the second bolt (39), and the second bolt (39) is threaded onto the flange (310).

7. A dynamic sealing device combining magnetohydrodynamic sealing and spring compensation according to claim 6, characterized in that: A second sealing ring (311) is fixed on the side of the bushing (1) away from the flange (310).

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