Improved magnetofluid sealing device for lifting crucible of single crystal furnace

Abstract

The utility model relates to the technical field of sealing, and discloses an improved magnetofluid sealing device for lifting a crucible of a single crystal furnace, which comprises a magnetofluid shell, a magnetofluid shaft and a magnetofluid sealing assembly, the magnetofluid sealing assembly is arranged between the upper end of the magnetofluid shaft and the upper end of the magnetofluid shell; a gland is clamped between the magnetic fluid sealing assembly and the tapered roller bearing on the upper side, and an oil through hole is formed in the gland in the radial direction; a grease filling hole is formed in the side wall of the upper end of the magnetic fluid shell. The grease filling hole is formed in the magnetic fluid shell, and the annular oil groove and the oil through hole are formed in the gland, so that lubricating grease can be conveniently filled into the tapered roller bearing, and the problem that an existing magnetic fluid sealing device is inconvenient to fill the lubricating grease is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of sealing, in particular to an improved magnetic fluid sealing device for lifting a single crystal furnace crucible. Background Art

[0002] Magnetic fluid sealing devices are generally composed of non-magnetic seats, bearings, magnetic poles, permanent magnets, magnetic shafts, and magnetic fluids. Under the action of a uniform and stable magnetic field, the magnetic fluid fills the set space and establishes a multi-level "O-ring" to achieve a sealing effect. Authorization announcement No. CN 206904243 U discloses a magnetic fluid sealing device for lifting a single crystal furnace crucible, comprising a transmission shaft and a base sleeved on the outside of the transmission shaft, the transmission shaft being a cylindrical hollow structure, tapered roller bearings are installed in the base near the front and rear ends and between the outer wall of the transmission shaft, dust rings are installed between the front and rear ends of the base and the outer wall of the transmission shaft, a magnetic fluid sealing assembly is installed between the tapered roller bearing at the front end of the base and the dust ring, a positioning sleeve is abutted between the two tapered roller bearings in the base, a limiting boss is provided between the magnetic fluid sealing assembly and the tapered roller bearing on the outer wall of the transmission shaft, the front tapered roller bearing abuts on the limiting boss, an end cover is connected to the rear end of the base, a limiting ring is fastened between the end cover on the outer wall of the transmission shaft and the tapered roller bearing at the rear, and the tapered roller bearing at the rear abuts on the limiting ring. Since the tapered roller bearing needs to be filled with lubricating oil after being used for a period of time, the end cover, limit ring and other components at one end of the base of the magnetic fluid sealing device must be disassembled before the lubricating oil can be filled, which is very inconvenient. Utility Model Content

[0003] The utility model aims to provide an improved magnetic fluid sealing device for lifting a single crystal furnace crucible, which can conveniently fill lubricating grease into a tapered roller bearing by arranging a grease filling hole on a magnetic fluid housing and an annular oil groove and an oil through hole on a gland, thereby solving the problem of inconvenient filling of lubricating grease in existing magnetic fluid sealing devices.

[0004] The above technical objectives of the utility model are achieved through the following technical solutions:

[0005] An improved magnetic fluid sealing device for lifting a single crystal furnace crucible comprises a magnetic fluid housing, a magnetic fluid shaft and a magnetic fluid sealing assembly. The magnetic fluid shaft is rotatably connected in the magnetic fluid housing through a pair of tapered roller bearings arranged up and down, and the magnetic fluid sealing assembly is arranged between the upper end of the magnetic fluid shaft and the upper end of the magnetic fluid housing; a pressure cover is sandwiched between the magnetic fluid sealing assembly and the tapered roller bearing on the upper side, and a radially arranged oil through hole is formed on the pressure cover;

[0006] A grease filling hole is formed on the side wall of the upper end of the magnetic fluid housing.

[0007] When grease needs to be added, the grease enters the magnetic fluid housing through the grease filling hole, and then enters the top of the tapered roller bearing through the oil hole. The grease can automatically move down to the two tapered roller bearings due to gravity, thereby lubricating the tapered roller bearings.

[0008] The utility model is further configured as follows: the gland is a rotating body with an inverted "L"-shaped cross section, and the outer wall of the gland is in contact with the inner wall of the magnetic fluid housing;

[0009] An annular oil groove is formed on the outer wall of the gland, and an oil hole is arranged through the annular oil groove;

[0010] The grease filling hole is arranged opposite to the annular oil groove.

[0011] The grease filling hole is connected with the oil through hole through the annular oil groove, which can reduce the difficulty of assembling the gland and there is no need to align the oil through hole with the grease filling hole;

[0012] The lubricating grease entering from the grease filling hole enters the annular oil groove, then flows along the annular oil groove to the oil through hole, and finally enters the top of the tapered roller bearing through the oil through hole.

[0013] The utility model is further configured as follows: the lower end of the gland is pressed against the upper end surface of the outer ring of the tapered roller bearing on the upper side;

[0014] The convex ring at the upper end of the pressure cover extends to above the inner ring of the tapered roller bearing.

[0015] Through the above technical solution, the gland is set in an inverted "L" shape to prevent grease from moving upward and play a blocking role.

[0016] The utility model is further configured as follows: a spacer sleeve is clamped between the outer ring end faces of the two tapered roller bearings, the lower end of the outer ring of the lower tapered roller bearing is pressed against the end cover flange, the lower end of the inner ring of the lower tapered roller bearing is pressed against the stop nut, and the stop nut is connected to the magnetic fluid shaft.

[0017] The relative position stability of the two tapered roller bearings and the magnetic fluid shaft can be ensured by the stop nut.

[0018] The utility model is further configured as follows: the stop nut includes a nut body threaded on the magnetic fluid shaft, a plurality of circumferentially evenly distributed process grooves and a plurality of radially penetrating threaded holes are formed on the outer wall of the nut body, a top screw and a flat-end set screw are threaded in each threaded hole, the flat-end set screw is pressed against the outer end of the top screw, and the inner end of the top screw is pressed against the magnetic fluid shaft.

[0019] The nut body can be prevented from loosening by the top screw, and the top screw can be prevented from loosening by the flat-end set screw, thereby ensuring the stability of the stop nut.

[0020] The outstanding effects of the utility model are:

[0021] Compared with the prior art, the grease filling hole is arranged on the magnetic fluid housing, and the annular oil groove and the oil through hole are arranged on the gland, so that the tapered roller bearing can be conveniently filled with lubricating grease, thereby solving the problem of inconvenient grease filling in the existing magnetic fluid sealing device. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the structure of the utility model;

[0023] Figure 2 It is the first cross-sectional view of the utility model;

[0024] Figure 3 It is a second cross-sectional view of the utility model;

[0025] Figure 4 It is a structural schematic diagram of the gland of the utility model;

[0026] Figure 5 for Figure 2 Section view about AA.

[0027] Reference numerals: 10, magnetic fluid housing; 20, magnetic fluid shaft; 30, tapered roller bearing; 40, magnetic fluid sealing assembly; 50, gland;

[0028] 31. Spacer; 32. End cover flange; 33. Lock nut;

[0029] 101. Grease filling hole;

[0030] 331, nut body; 332, process groove; 333, threaded hole; 334, top screw; 335, flat end set screw;

[0031] 501, oil hole; 502, annular oil groove; 503, convex ring. DETAILED DESCRIPTION

[0032] The following is a further detailed description of the specific implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0033] An improved magnetic fluid sealing device for lifting a single crystal furnace crucible, such as Figure 1 , Figure 2As shown, it includes a magnetic fluid housing 10, a magnetic fluid shaft 20 and a magnetic fluid sealing assembly 40. The magnetic fluid shaft 20 is rotatably connected in the magnetic fluid housing 10 through a pair of tapered roller bearings 30 arranged up and down. The magnetic fluid sealing assembly 40 is placed between the upper end of the magnetic fluid shaft 20 and the upper end of the magnetic fluid housing 10; a pressure cover 50 is clamped between the magnetic fluid sealing assembly 40 and the tapered roller bearing 30 on the upper side, and the pressure cover 50 is formed with a radially arranged oil hole 501;

[0034] A grease filling hole 101 is formed on the upper side wall of the magnetic fluid housing 10 .

[0035] When grease needs to be added, the grease enters the magnetic fluid housing through the grease filling hole, and then enters the top of the tapered roller bearing through the oil hole. The grease can automatically move down to the two tapered roller bearings due to gravity, thereby lubricating the tapered roller bearings.

[0036] like Figure 3 , Figure 4 As shown, the gland 50 is a rotating body with an inverted "L"-shaped cross section, and the outer wall of the gland 50 is attached to the inner wall of the magnetic fluid housing 10;

[0037] An annular oil groove 502 is formed on the outer wall of the gland 50, and an oil hole 501 is provided through the annular oil groove 502;

[0038] The grease filling hole 101 is arranged opposite to the annular oil groove 502 .

[0039] The grease filling hole is connected with the oil through hole through the annular oil groove, which can reduce the difficulty of assembling the gland and there is no need to align the oil through hole with the grease filling hole;

[0040] The lubricating grease entering from the grease filling hole enters the annular oil groove, then flows along the annular oil groove to the oil through hole, and finally enters the top of the tapered roller bearing through the oil through hole.

[0041] The utility model is further configured as follows: the lower end of the gland 50 is pressed against the upper end surface of the outer ring of the tapered roller bearing 30 on the upper side;

[0042] The convex ring 503 on the upper end of the pressure cover 50 extends to above the inner ring of the tapered roller bearing 30 .

[0043] Through the above technical solution, the gland is set in an inverted "L" shape to prevent grease from moving upward and play a blocking role.

[0044] like Figure 2As shown, a spacer sleeve 31 is clamped between the outer ring end faces of the two tapered roller bearings 30, the lower end of the outer ring of the lower tapered roller bearing 30 is pressed against the end cover flange 32, and the lower end of the inner ring of the lower tapered roller bearing 30 is pressed against the retaining nut 33, and the retaining nut 33 is connected to the magnetic fluid shaft 20.

[0045] The relative position stability of the two tapered roller bearings and the magnetic fluid shaft can be ensured by the stop nut.

[0046] like Figure 5 As shown, the stop nut 33 includes a nut body 331 threaded on the magnetic fluid shaft 20, and the outer wall of the nut body 331 is formed with a plurality of circumferentially evenly distributed process grooves 332 and a plurality of radially penetrating threaded holes 333, and each threaded hole 333 is threaded with a top screw 334 and a flat-end locking screw 335, and the flat-end locking screw 335 is pressed against the outer end of the top screw 334, and the inner end of the top screw 334 is pressed against the magnetic fluid shaft 20.

[0047] The nut body can be prevented from loosening by the top screw, and the top screw can be prevented from loosening by the flat-end set screw, thereby ensuring the stability of the stop nut.

[0048] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications of the above assumptions should also be regarded as the protection scope of the present invention.

Claims

1. An improved magnetic fluid sealing device for lifting a single crystal furnace crucible, comprising a magnetic fluid housing (10), a magnetic fluid shaft (20) and a magnetic fluid sealing assembly (40), wherein the magnetic fluid shaft (20) is rotatably connected to the magnetic fluid housing (10) via a pair of tapered roller bearings (30) arranged up and down, and the magnetic fluid sealing assembly (40) is disposed between the upper end of the magnetic fluid shaft (20) and the upper end of the magnetic fluid housing (10); characterized in that: A pressure cover (50) is sandwiched between the magnetic fluid sealing assembly (40) and the tapered roller bearing (30) on the upper side, and a radially arranged oil through hole (501) is formed on the pressure cover (50); A grease filling hole (101) is formed on the upper side wall of the magnetic fluid housing (10).

2. The improved magnetic fluid sealing device for lifting a single crystal furnace crucible according to claim 1, characterized in that: The gland (50) is a rotating body with an inverted "L"-shaped cross section, and the outer wall of the gland (50) is in contact with the inner wall of the magnetic fluid housing (10); An annular oil groove (502) is formed on the outer wall of the gland (50), and an oil hole (501) is provided penetrating the annular oil groove (502); The grease filling hole (101) is arranged opposite to the annular oil groove (502).

3. The improved magnetic fluid sealing device for lifting a single crystal furnace crucible according to claim 2, characterized in that: The lower end of the gland (50) is pressed against the upper end surface of the outer ring of the tapered roller bearing (30) on the upper side; The convex ring (503) at the upper end of the gland (50) extends to above the inner ring of the tapered roller bearing (30).

4. The improved magnetic fluid sealing device for lifting a single crystal furnace crucible according to claim 3, characterized in that: A spacer sleeve (31) is sandwiched between the outer ring end faces of the two tapered roller bearings (30), the lower end of the outer ring of the lower tapered roller bearing (30) is pressed against the end cover flange (32), and the lower end of the inner ring of the lower tapered roller bearing (30) is pressed against the stop nut (33), and the stop nut (33) is connected to the magnetic fluid shaft (20).

5. The improved magnetic fluid sealing device for lifting a single crystal furnace crucible according to claim 4, characterized in that: The stop nut (33) comprises a nut body (331) threadedly connected to the magnetic fluid shaft (20); a plurality of circumferentially evenly distributed process grooves (332) and a plurality of radially penetrating threaded holes (333) are formed on the outer wall of the nut body (331); a top screw (334) and a flat-end set screw (335) are threadedly connected inside each threaded hole (333); the flat-end set screw (335) is pressed against the outer end of the top screw (334), and the inner end of the top screw (334) is pressed against the magnetic fluid shaft (20).

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