Magnetic fluid sealing transmission device

Abstract

The utility model discloses a magnetofluid sealing transmission device, and particularly relates to the field of magnetofluid sealing, which comprises a hollow shaft with a flange part rotatably arranged at one end, a magnetic conductive shaft sleeve positioned below the hollow shaft is fixedly mounted on the flange part, a plurality of annular grooves filled with magnetofluid with preset volume are formed in the magnetic conductive shaft sleeve, and the magnetic conductive shaft sleeve is fixedly mounted on the flange part. A first annular magnetic pole and a second annular magnetic pole which are symmetrically arranged relative to the center of the permanent magnet are fixedly installed between the magnetic conduction shaft sleeves. And under the matching of the permanent magnet, the first annular magnetic pole and the second annular magnetic pole, the magnetic fluid is filled in a gap between the two first annular magnetic poles and the second annular magnetic pole and the magnetic conductive shaft sleeve under the action of a magnetic field, so that an O-shaped sealing ring is formed. According to the utility model, the hollow shaft is fixed on the flange piece by utilizing the end cover and the locking nut.

Description

Technical Field

[0001] The utility model relates to the field of magnetic fluid sealing, in particular to a magnetic fluid sealing transmission device. Background Art

[0002] Magnetic fluid is a magnetically conductive liquid that exhibits magnetism when subjected to an external magnetic field. Magnetic fluid seals utilize this property to form a liquid seal within a gap, thereby achieving a seal. Their characteristics include reliable sealing, zero leakage, no mechanical wear, long service life, and high efficiency. Magnetic fluid seal technology varies in structure depending on the operating conditions.

[0003] As disclosed in Publication (Announcement) No. CN202418592U, Publication (Announcement) Date: September 5, 2012, a magnetic fluid sealing device comprises a rotating shaft, a sealing pair having a bearing mounting hole and a rotating shaft mounting hole, a bearing, and a housing having an inner hole. The bearing is disposed in the bearing mounting hole of the sealing pair; the sealing pair, which is equipped with the bearing, is disposed in the inner hole of the housing; and the rotating shaft is disposed in the rotating shaft mounting hole of the sealing pair. The magnetic fluid sealing device provided by this utility model ensures a sealing gap between the sealing pair and the rotating shaft by aligning the outer diameter of the sealing pair with the inner hole of the housing, the outer ring of the bearing with the bearing mounting hole of the sealing pair, and the inner ring of the bearing with the outer diameter of the rotating shaft. This reduces the machining and mating accuracy of the inner hole of the housing and the outer diameter of the sealing pair, thereby lowering machining costs, simplifying the assembly process, and improving the sealing reliability of the product. Furthermore, since the bearing is disposed within the sealing pair, the longitudinal space required for a separate bearing is eliminated, thereby reducing the axial length of the sealing device.

[0004] In existing technologies, including those described in the aforementioned patent, the large diameter of the shaft easily damages the magnetic grooves on the shaft surface when installing the shaft clamp. Furthermore, the flange on the shaft makes installation of the end cap difficult. We look forward to finding a solution! Summary of the Invention

[0005] The purpose of this utility model is to provide a magnetic fluid sealing transmission device to solve the above problems.

[0006] In order to achieve the above purpose, the present invention provides the following technical solutions:

[0007] A magnetic fluid sealing transmission device includes a hollow shaft with a flange component rotating at one end, a magnetic sleeve located below the hollow shaft fixedly mounted on the flange component, a plurality of annular grooves with a predetermined volume of magnetic fluid injected therein opened on the magnetic sleeve, a first annular magnetic pole and a second annular magnetic pole symmetrically arranged about the center of a permanent magnet fixedly mounted between the magnetic sleeves, and when the permanent magnet cooperates with the first annular magnetic pole and the second annular magnetic pole, the magnetic fluid fills the gap between the two first annular magnetic poles and the second annular magnetic poles and the magnetic sleeves under the action of the magnetic field to form an O-ring.

[0008] Preferably, an O-ring is provided at the junction of the hollow shaft and the magnetic conductive sleeve.

[0009] Preferably, a first gasket is provided between the hollow shaft and the first annular magnetic pole.

[0010] Preferably, a second gasket is provided between the hollow shaft and the second annular magnetic pole.

[0011] Preferably, a housing is fixedly mounted on the flange, an end cover for fixing the bearing at one end of the hollow shaft is mounted on the housing, and a locking nut for fixing the bearing at the other end of the hollow shaft is threadedly connected to the flange.

[0012] Preferably, the first gasket is a rubber piece.

[0013] Preferably, the second gasket is a rubber piece.

[0014] Preferably, a first deep groove ball bearing and a second deep groove ball bearing sleeved on the hollow shaft are symmetrically installed between the flange and the housing.

[0015] Preferably, the housing and the hollow shaft are transitionally matched with the first deep groove ball bearing and the second deep groove ball bearing.

[0016] In the above technical solution, the utility model provides a magnetic fluid sealing transmission device, which has the following beneficial effects: the hollow shaft is fixed to the flange part by using the end cover and the locking nut, and the two first deep groove ball bearings and the inner ring of the second deep groove ball bearing are fixed by using a magnetic sleeve. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0018] Figure 1A cross-sectional view of an embodiment of the present invention is provided.

[0019] Description of reference numerals:

[0020] 1. Hollow shaft; 2. Housing; 3a. First deep groove ball bearing; 3b. Second deep groove ball bearing; 4a. First annular magnetic pole; 4b. Second annular magnetic pole; 5. Permanent magnet; 6a. First washer; 6b. Second washer; 7. End cover; 8. Magnetic sleeve; 9. Lock nut; 10. O-ring. DETAILED DESCRIPTION

[0021] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0022] like Figure 1 As shown, a magnetic fluid sealed transmission device includes a hollow shaft 1 on which a first deep groove ball bearing 3a and a second deep groove ball bearing 3b are symmetrically mounted. One end of the hollow shaft 1 is rotatably set on a flange, and the first deep groove ball bearing 3a and the second deep groove ball bearing 3b are fixed to the flange by screws.

[0023] Furthermore, in this embodiment, an end cap 7 covers the bearing at the first end of the hollow shaft 1 and is secured to the flange with four diagonal screws. The housing 2 rests on the end cap 7 and is also secured with screws. The second end of the hollow shaft 1 passes through the housing 2 and the flange, respectively, and is then secured to the bearing with a lock nut 9.

[0024] Secondly, a magnetic sleeve 8 located below the hollow shaft 1 is fixedly mounted on the flange member in the embodiment, and a plurality of annular grooves filled with a predetermined volume of magnetic fluid are opened on the magnetic sleeve 8. A first annular magnetic pole 4a and a second annular magnetic pole 4b symmetrically arranged about the center of the permanent magnet 5 are fixedly mounted between the magnetic sleeves 8, and the permanent magnet 5 cooperates with the first annular magnetic pole 4a and the second annular magnetic pole 4b so that the magnetic fluid fills the gap between the two first annular magnetic poles 4a and the second annular magnetic pole 4b and the magnetic sleeve 8 under the action of the magnetic field to form an O-ring.

[0025] It should be noted that an O-ring is provided at the joint between the hollow shaft 1 and the magnetic conductive sleeve 8 .

[0026] Furthermore, in the above embodiment, the first deep groove ball bearing 3 a and the second deep groove ball bearing 3 b are transitionally fitted with the hollow shaft 1 and the housing 2 .

[0027] Furthermore, a first washer 6a is provided between the hollow shaft 1 and the first annular magnetic pole 4a. A second washer 6b is provided between the hollow shaft 1 and the second annular magnetic pole 4b. The washer is a rubber part.

[0028] It should be noted that a first deep groove ball bearing 3a and a second deep groove ball bearing 3b are symmetrically mounted between the flange and the housing 2, sleeved on the hollow shaft 1. The housing 2 and hollow shaft 1, along with the first and second deep groove ball bearings 3a and 3b, form a transition fit. O-rings 10 are installed where the first and second annular magnetic poles 4a and 4b meet the housing 2.

[0029] In summary, the hollow shaft 1 is fixed to the flange by using the end cover 7 and the lock nut 9. The inner rings of the first deep groove ball bearing 3a and the second deep groove ball bearing 3b are fixed by using a magnetic sleeve 8.

[0030] The above description is merely illustrative of certain exemplary embodiments of the present invention. It goes without saying that those skilled in the art will be able to modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and description are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A magnetic fluid sealing transmission device, characterized in that: The invention comprises a hollow shaft (1) with a flange member rotating at one end, a magnetic sleeve (8) located below the hollow shaft (1) being fixedly mounted on the flange member, a plurality of annular grooves in which a predetermined volume of magnetic fluid is injected are opened on the magnetic sleeve (8), a first annular magnetic pole (4a) and a second annular magnetic pole (4b) symmetrically arranged about the center of the permanent magnet (5) are fixedly mounted between the magnetic sleeves (8), and the magnetic fluid is filled into the gap between the two first annular magnetic poles (4a) and the second annular magnetic pole (4b) and the magnetic sleeve (8) under the action of the magnetic field when the permanent magnet (5) cooperates with the first annular magnetic pole (4a) and the second annular magnetic pole (4b) to form an O-ring.

2. A magnetic fluid sealing transmission device according to claim 1, characterized in that: An O-ring is provided at the junction of the hollow shaft (1) and the magnetic conductive sleeve (8).

3. A magnetic fluid sealing transmission device according to claim 1, characterized in that: A first gasket (6a) is provided between the hollow shaft (1) and the first annular magnetic pole (4a).

4. A magnetic fluid sealing transmission device according to claim 1, characterized in that: A second gasket (6b) is provided between the hollow shaft (1) and the second annular magnetic pole (4b).

5. The magnetic fluid sealing transmission device according to claim 1, characterized in that: A housing (2) is fixedly mounted on the flange, an end cover (7) for fixing a bearing at one end of the hollow shaft (1) is mounted on the housing (2), and a locking nut (9) for fixing a bearing at the other end of the hollow shaft (1) is threadedly connected to the flange.

6. The magnetic fluid sealing transmission device according to claim 3, characterized in that: The first gasket (6a) is a rubber piece.

7. The magnetic fluid sealing transmission device according to claim 4, characterized in that: The second gasket (6b) is a rubber piece.

8. The magnetic fluid sealing transmission device according to claim 5, characterized in that: A first deep groove ball bearing (3a) and a second deep groove ball bearing (3b) sleeved on the hollow shaft (1) are symmetrically mounted between the flange and the housing (2).

9. The magnetic fluid sealing transmission device according to claim 8, characterized in that: The housing (2) and the hollow shaft (1) are in transition fit with the first deep groove ball bearing (3a) and the second deep groove ball bearing (3b).

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