CN217761422U

CN217761422U - Oil leakage prevention labyrinth seal structure of magnetic pump bearing box

Info

Publication number: CN217761422U
Application number: CN202221699277.4U
Authority: CN
Inventors: 杨建青; 李晓琴; 来小锋; 谢东洋; 曹焕芳
Original assignee: HANGZHOU DALU INDUSTRIAL CO LTD
Current assignee: HANGZHOU DALU INDUSTRIAL CO LTD
Priority date: 2022-07-04
Filing date: 2022-07-04
Publication date: 2022-11-08
Anticipated expiration: 2032-07-04

Abstract

The utility model relates to a magnetic drive pump bearing box leak protection oil labyrinth seal structure, the lubricated magnetic drive pump technical field of affiliated thin oil, including the bearing box body, bearing box body both ends all be equipped with the fixed bearing box end cover of bearing box body looks flange formula bolted connection, the bearing box in be equipped with the transmission shaft that extends the bearing box end cover, the transmission shaft front end be equipped with the spacing formula nested connection of transmission shaft parallel key and with the nested outer magnet rotor of bearing box end cover looks sealed. The bearing box end cover comprises a bearing box end cover, an end face oil return ring groove integrated with the bearing box end cover is arranged between the bearing box end cover and the bearing box body, and inner hole labyrinth ring grooves integrated with the bearing box end cover are arranged between the bearing box end cover, the outer magnetic rotor and the transmission shaft. The sealing device has the characteristics of compact structure, good sealing effect and good operation stability. The problem of lubricating oil leakage is solved.

Description

Labyrinth seal structure for preventing oil leakage of bearing box of magnetic pump

Technical Field

The utility model relates to a thin oil lubrication magnetic drive pump technical field, concretely relates to magnetic drive pump bearing box leak protection oil labyrinth seal structure.

Background

The shaft extension of the magnetic pump adopting the thin oil to lubricate the bearing needs to be sealed to prevent lubricating oil in the bearing box from leaking out of the bearing box. There are two types of seals commonly used: contact rubber seals and non-contact labyrinth seals. The rubber seal is of a contact friction type, so that the service life is short, and the rubber seal is not suitable for flammable and explosive places which do not allow static electricity to be generated, such as petrochemical industry. The labyrinth seal is non-contact seal, utilizes the tiny clearance to block lubricating oil leakage, has no relative solid friction, has no service life limitation, and is suitable for the chemical industry. But the shaft of the bearing box of the magnetic pump close to the pump is extended and connected with an external magnetic rotor. Due to the large diameter of the outer magnetic rotor, a significant blowing effect is caused during rotation, creating a low pressure region at the hub.

Antifriction bearing can drive lubricating oil at high-speed rotatory in-process and splash, forms the oiliness air, through the labyrinth seal clearance between axle and the end cover, outside being sucked the end cover, leads to lubricating oil to reveal. Although the leakage speed is not high, the leakage quantity is accumulated greatly after the leakage speed is over a long time, an obvious oil leakage point is formed, the environmental pollution is caused, and the safe and reliable operation of the magnetic pump bearing box is influenced by excessive loss of lubricating oil.

Disclosure of Invention

The utility model discloses there are not enough of sealed effect not good enough and operating stability poor among the main prior art of solving, provide a magnetic pump bearing box leak protection oil labyrinth seal structure, it has compact structure, sealed effectual and operating stability good characteristics. The problem of lubricating oil reveal is solved.

The above technical problem of the present invention can be solved by the following technical solutions:

the labyrinth seal structure comprises a bearing box body, wherein both ends of the bearing box body are respectively provided with a bearing box end cover fixedly connected with a flange type bolt of the bearing box body, a transmission shaft extending out of the bearing box end cover is arranged in the bearing box body, and the front end of the transmission shaft is provided with an outer magnetic rotor which is in limit type nested connection with a flat key of the transmission shaft and is nested with the bearing box end cover in a sealed mode. The bearing box end cover comprises a bearing box end cover, an end face oil return ring groove integrated with the bearing box end cover is arranged between the bearing box end cover and the bearing box body, and inner hole labyrinth ring grooves integrated with the bearing box end cover are arranged between the bearing box end cover, the outer magnetic rotor and the transmission shaft.

Preferably, a plurality of rib plates which are distributed annularly at equal intervals are arranged between the outer end face of the end cover of the bearing box and the outer magnetic rotor. The rib plates are used for preventing the outer magnetic rotor from driving air at the position to rotate when rotating, negative pressure close to the axis position caused by centrifugal force when the air rotates is eliminated, air pressure at two sides of the end cover is balanced, and oil mist leakage caused by suction effect is avoided.

Preferably, the upper end of the bearing box body (8) is provided with a vent cap (7), and the side edge of the bearing box body (8) is provided with an oil pointer (16); and a locking nut (17) which is in threaded sleeve joint with the transmission shaft (9) is arranged in the outer magnetic rotor (6).

Preferably, a pump body (1) is arranged at the front end of the outer magnetic rotor (6), an output shaft (15) is arranged between the pump body (1) and the outer magnetic rotor (6), an impeller (2) in limited nested connection with the output shaft (15) is arranged between the front end of the output shaft (15) and the pump body (1), an inner magnetic rotor (13) in parallel key type limited nested connection with the output shaft (15) is arranged between the rear end of the output shaft (15) and the outer magnetic rotor (6), and a spacer sleeve (14) is arranged between the inner magnetic rotor (13) and the outer magnetic rotor (6).

Preferably, the rear end of the pump body (1) is provided with a pump cover (3) which is fixedly sleeved with the output shaft (15) in a bearing manner, the pump cover (3) is fixedly connected with the pump body (1) through a flange bolt, a transition box body (4) which is sleeved with the outer magnetic rotor (6) is arranged between the pump cover (3) and the bearing box body (8), and the transition box body (4) is fixedly connected with the pump cover (3) and the bearing box body (8) through bolts.

Preferably, the lower end of the transition box body (4) and the lower end of the bearing box body (8) are both provided with oil discharge plugs (11), and the upper end of the transition box body (4) is provided with a lifting lug (5).

Preferably, a rolling bearing (10) which is connected with the transmission shaft (9) in a nested manner is arranged between the two ends of the bearing box body (8) and the transmission shaft (9).

The utility model discloses can reach following effect:

the utility model provides a magnetic drive pump bearing box leak protection oil labyrinth seal structure compares with prior art, has compact structure, sealed effectual and the good characteristics of operating stability. The problem of lubricating oil reveal is solved.

Drawings

Fig. 1 is a structural sectional view of the present invention.

Fig. 2 is a structural sectional view of the bearing housing of the present invention.

Fig. 3 is a structural sectional view of a bearing housing end cover according to the present invention.

Fig. 4 is a schematic structural diagram of a bearing housing end cover according to the present invention.

In the figure: the oil pump comprises a pump body 1, an impeller 2, a pump cover 3, a transition box body 4, a lifting lug 5, an outer magnetic rotor 6, a ventilation cap 7, a bearing box body 8, a transmission shaft 9, a rolling bearing 10, an oil discharge plug 11, a bearing box end cover 12, an inner magnetic rotor 13, a spacer sleeve 14, an output shaft 15, an oil pointer 16, a locking nut 17, a rib plate 18, an end face oil return ring groove 19 and an inner hole labyrinth ring groove 20.

Detailed Description

The technical solution of the present invention is further specifically described below by way of embodiments and with reference to the accompanying drawings.

Example (b): as shown in fig. 1-4, the labyrinth seal structure for preventing oil leakage of the bearing box of the magnetic pump comprises a bearing box body 8, wherein a vent cap 7 is arranged at the upper end of the bearing box body 8, and an oil pointer 16 is arranged on the side edge of the bearing box body 8. Bearing box end covers 12 fixedly connected with the bearing box 8 through flange type bolts are arranged at two ends of the bearing box 8, a transmission shaft 9 extending out of the bearing box end covers 12 is arranged in the bearing box 8, and rolling bearings 10 connected with the transmission shaft 9 in an embedded mode are arranged between two ends of the bearing box 8 and the transmission shaft 9. The front end of the transmission shaft 9 is provided with an external magnetic rotor 6 which is in flat key limit type nested connection with the transmission shaft 9 and is in sealed type nested connection with the end cover 12 of the bearing box, and a locking nut 17 which is in threaded type sleeved connection with the transmission shaft 9 is arranged in the external magnetic rotor 6. The front end of the outer magnetic rotor 6 is provided with a pump body 1, an output shaft 15 is arranged between the pump body 1 and the outer magnetic rotor 6, an impeller 2 which is in spacing nested connection with the output shaft 15 is arranged between the front end of the output shaft 15 and the pump body 1, an inner magnetic rotor 13 which is in flat key type spacing nested connection with the output shaft 15 is arranged between the rear end of the output shaft 15 and the outer magnetic rotor 6, and a spacer sleeve 14 is arranged between the inner magnetic rotor 13 and the outer magnetic rotor 6. The rear end of the pump body 1 is provided with a pump cover 3 which is fixedly sleeved with a 15-phase bearing of the output shaft, the pump cover 3 is fixedly connected with the pump body 1 through a flange type bolt, a transition box body 4 which is sleeved with an outer magnetic rotor 6 is arranged between the pump cover 3 and a bearing box body 8, and the transition box body 4 is fixedly connected with the pump cover 3 and the bearing box body 8 through bolts. The lower end of the transition box body 4 and the lower end of the bearing box body 8 are both provided with an oil discharge plug 11, and the upper end of the transition box body 4 is provided with a lifting lug 5.

The bearing box end cover 12 comprises a bearing box end cover 12, and 4 rib plates 18 which are distributed in an annular mode at equal intervals are arranged between the outer end face of the bearing box end cover 12 and the outer magnetic rotor 6. An end face oil return ring groove 19 integrated with the bearing box end cover 12 is arranged between the bearing box end cover 12 and the bearing box body 8, and inner hole labyrinth ring grooves 20 integrated with the bearing box end cover 12 are arranged between the bearing box end cover 12, the outer magnetic rotor 6 and the transmission shaft 9. The clearance between the end face of the bearing box end cover 12 and the end face of the rolling bearing 10 is small, lubricating oil flowing into the clearance is adhered to the inner ring of the rolling bearing 10 and thrown to the outer ring direction of the bearing box end cover 12 by the centrifugal force when the bearing rotates, and the lubricating oil is prevented from leaking. An end face oil return ring groove 19 is arranged below the inner hole labyrinth ring groove 20 and close to the rolling bearing 10 side and used for returning oil leaked along the end face of the bearing box end cover 12 to the cavity of the rolling bearing 10. The lubricating oil which is leaked to the outside is ensured to be remained at the extending positions of the bearing box body 8 and the transmission shaft 9.

To sum up, this magnetic drive pump bearing box leak protection oil labyrinth seal structure has compact structure, sealed effectual and the good characteristics of operating stability. The problem of lubricating oil reveal is solved.

It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without deviating from the basic characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

In conclusion, the above description is only the specific embodiment of the present invention, but the structural features of the present invention are not limited thereto, and any person skilled in the art can make changes or modifications within the scope of the present invention.

Claims

1. The utility model provides a magnetic drive pump bearing box leak protection oil labyrinth seal structure which characterized in that: the magnetic bearing comprises a bearing box body (8), wherein both ends of the bearing box body (8) are provided with bearing box end covers (12) fixedly connected with the bearing box body (8) through flange bolts, a transmission shaft (9) extending out of the bearing box end covers (12) is arranged in the bearing box body (8), and the front end of the transmission shaft (9) is provided with an outer magnetic rotor (6) which is in parallel key limit type nested connection with the transmission shaft (9) and is in sealed nested connection with the bearing box end covers (12); bearing box end cover (12) include bearing box end cover (12), bearing box end cover (12) and bearing box body (8) between be equipped with and be integrated terminal surface oil return annular (19) with bearing box end cover (12), bearing box end cover (12) and outer magnet rotor (6), transmission shaft (9) between all be equipped with and be integrated hole labyrinth annular (20) with bearing box end cover (12).

2. The labyrinth seal structure for preventing oil leakage of the bearing box of the magnetic pump as claimed in claim 1, is characterized in that: a plurality of rib plates (18) which are distributed annularly at equal intervals are arranged between the outer end face of the bearing box end cover (12) and the outer magnetic rotor (6).

3. The labyrinth seal structure for preventing oil leakage of a bearing housing of a magnetic pump as claimed in claim 1, characterized in that: the upper end of the bearing box body (8) is provided with a ventilation cap (7), and the side edge of the bearing box body (8) is provided with an oil pointer (16); and a locking nut (17) which is in threaded sleeve joint with the transmission shaft (9) is arranged in the outer magnetic rotor (6).

4. The labyrinth seal structure for preventing oil leakage of the bearing box of the magnetic pump as claimed in claim 1, is characterized in that: the pump body (1) is arranged at the front end of the external magnetic rotor (6), an output shaft (15) is arranged between the pump body (1) and the external magnetic rotor (6), an impeller (2) in limit nested connection with the output shaft (15) is arranged between the front end of the output shaft (15) and the pump body (1), an internal magnetic rotor (13) in flat key type limit nested connection with the output shaft (15) is arranged between the rear end of the output shaft (15) and the external magnetic rotor (6), and an isolating sleeve (14) is arranged between the internal magnetic rotor (13) and the external magnetic rotor (6).

5. The labyrinth seal structure for preventing oil leakage of a bearing housing of a magnetic pump as claimed in claim 4, wherein: the pump comprises a pump body (1), wherein a pump cover (3) fixedly sleeved with an output shaft (15) in a bearing type is arranged at the rear end of the pump body (1), the pump cover (3) is fixedly connected with the pump body (1) in a flange type bolt manner, a transition box body (4) sleeved with an outer magnetic rotor (6) is arranged between the pump cover (3) and a bearing box body (8), and the transition box body (4) is fixedly connected with the pump cover (3) and the bearing box body (8) in a bolt manner.

6. The labyrinth seal structure for preventing oil leakage of the bearing housing of the magnetic pump as claimed in claim 5, is characterized in that: the lower end of the transition box body (4) and the lower end of the bearing box body (8) are respectively provided with an oil discharge plug (11), and the upper end of the transition box body (4) is provided with a lifting lug (5).

7. The labyrinth seal structure for preventing oil leakage of the bearing box of the magnetic pump as claimed in claim 1, is characterized in that: and a rolling bearing (10) which is connected with the transmission shaft (9) in a nested way is arranged between the two ends of the bearing box body (8) and the transmission shaft (9).