Rotary equipment shaft end grease lubrication seal structure

Abstract

This rotating equipment shaft end grease lubrication seal structure relates to the field of sealing structures and is primarily designed to address the problem of frequent replacement of existing rotating equipment shaft end grease lubrication seals. It includes an inner labyrinth cover fixed to the bearing housing, an inner baffle fixed to the shaft, and an oil return groove on the inner labyrinth cover with an oil return chamber at the bottom. The diameter of the oil return groove near the bearing is larger than the diameter of the bottom. Sealing packing is installed in the sealing packing mounting groove of the inner labyrinth cover. Both the outer and inner ring surfaces of the oil return chamber are inclined. An outer labyrinth cover is fitted over the shaft, with a baffle plate on the outer labyrinth cover positioned within the groove of the inner labyrinth cover. A pressure sleeve is fixed to the shaft outside the outer labyrinth cover. A retaining ring is installed in the space between the inner labyrinth cover and the shaft, fixed to the shaft. The outer ring surface of the retaining ring contacts the sealing packing, the inner end of the inner ring contacts the inner baffle, and the outer end of the retaining ring contacts the outer labyrinth cover. Its advantage is a long service life.

Description

Technical Field

[0001] This utility model relates to the field of sealing structures, specifically to a grease-lubricated sealing structure for the shaft end of a rotating device. Background Technology

[0002] The grease-lubricated seals at the shaft ends of existing rotating equipment mostly use skeleton oil seals. Skeleton oil seals are made of rubber. Due to the long-term rotation of the shaft and the friction between the shaft and the skeleton oil seal, and the fact that the shaft speed is sometimes high, the rubber temperature will rise. The rise in rubber temperature will greatly reduce its service life and cause damage, resulting in oil leakage at the shaft end, affecting the use of the equipment, and requiring frequent replacement, which is time-consuming and labor-intensive. Summary of the Invention

[0003] The technical problem to be solved by this utility model is to provide a grease-lubricated sealing structure for the shaft end of rotating equipment that can improve the service life of the shaft end seal.

[0004] The purpose of this utility model is achieved as follows: It includes an annular inner labyrinth cover, which is fixed to the bearing seat of the rotating equipment by bolts. The inner labyrinth cover is sleeved on the outside of the shaft, and the inner baffle is fixed on the shaft on the inner side of the inner labyrinth cover (i.e., the side facing the bearing seat). An annular oil return groove is formed on the end face (i.e., the inner end face) of the inner labyrinth cover facing the bearing seat. The oil return groove is connected to the bearing in the bearing seat. An annular oil return cavity that is recessed into the inner labyrinth cover is formed at the bottom of the oil return groove near the outer ring edge of the groove. When the lubricating oil of the bearing enters the oil return groove, it can flow back into the bearing from the lower oil return cavity, preventing the lubricating oil from leaking out.

[0005] The diameter of the inner baffle is smaller than the diameter of the return oil groove, and it is placed inside the return oil groove.

[0006] The diameter of the oil return groove near the bearing end is larger than the diameter of the groove bottom, making the outer ring vertical surface of the oil return groove inclined with an inclination angle >15°.

[0007] An annular sealing filler installation groove is formed on the inner ring surface of the inner labyrinth cover, which is recessed into the interior of the inner labyrinth cover. The annular sealing filler is installed in the sealing filler installation groove.

[0008] The outer and inner ring surfaces of the oil return cavity are also inclined. The outer ring surface of the oil return cavity and the outer ring surface of the oil return groove are on the same straight line, that is, the inclination angle of the outer ring surface of the oil return cavity and the outer ring surface of the oil return groove are the same. The outer ring surface of the oil return cavity and the inner ring surface of the oil return cavity are parallel.

[0009] The sealing packing is an oil-based graphite packing.

[0010] The inner labyrinth cover has several annular grooves on its outer end face (the side furthest from the bearing). Several annular baffles are fixed to the outer labyrinth cover, which is located outside the inner labyrinth cover. The number of baffles on the outer labyrinth cover is the same as the number of grooves on the inner labyrinth cover. The outer labyrinth cover is fitted over the shaft, with each baffle on the outer labyrinth cover positioned within a groove in the inner labyrinth cover. A pressure sleeve is fixed to the shaft outside the outer labyrinth cover, secured with bolts. The pressure sleeve compresses and secures the outer and inner labyrinth covers.

[0011] A retaining ring is provided in the space between the inner labyrinth cover and the shaft. The retaining ring is fixed on the shaft. The outer ring surface of the retaining ring contacts the sealing packing, the inner end of the inner ring contacts the inner retaining plate, and the outer end of the retaining ring contacts the outer labyrinth cover.

[0012] The advantages of this invention are: when the shaft rotates, the inner retaining plate, retaining ring, outer labyrinth cover, and pressure sleeve rotate together; because the outer vertical edges of the oil return groove and oil return cavity are inclined, when lubricating oil overflows, it can flow back to the bearing interior through the oil return groove and oil return cavity; the use of graphite packing seals prevents oil overflow; and the inner labyrinth cover and outer sealing cover prevent external dust from entering. This sealing structure solves the problems of short service life, the need for long-term maintenance and replacement, and the impact on production, time and labor costs associated with current skeleton seals. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model;

[0014] Figure 2 yes Figure 1 Enlarged structural diagram at point A in the middle. Detailed Implementation

[0015] The following is combined with Figure 1 and Figure 2 The present invention will be further described below;

[0016] It includes an annular inner labyrinth cover 1, which is fixed to the bearing housing 2 of the rotating equipment by bolts. The inner labyrinth cover is sleeved on the outside of the shaft 3. An inner baffle 4 is fixed on the shaft on the inner side of the inner labyrinth cover (i.e., the side facing the bearing housing). An annular oil return groove 5 is formed on the end face (i.e., the inner end face) of the inner labyrinth cover facing the bearing housing. The oil return groove is connected to the bearing in the bearing housing. An annular oil return cavity 6 is formed at the bottom of the oil return groove near the outer ring edge of the groove, which is recessed into the inner labyrinth cover. When the lubricating oil of the bearing enters the oil return groove, it can flow back into the bearing from the lower oil return cavity, preventing the lubricating oil from leaking out.

[0017] The diameter of the inner baffle is smaller than the diameter of the return oil groove, and it is placed inside the return oil groove.

[0018] The diameter of the oil return groove near the bearing end is larger than the diameter of the groove bottom, making the outer ring vertical surface of the oil return groove inclined with an inclination angle >15°.

[0019] An annular sealing filler installation groove is formed on the inner ring surface of the inner labyrinth cover, which is recessed into the inner labyrinth cover. The annular sealing filler 7 is installed in the sealing filler installation groove.

[0020] The outer and inner ring surfaces of the oil return cavity are also inclined. The outer ring surface of the oil return cavity and the outer ring surface of the oil return groove are on the same straight line, that is, the inclination angle of the outer ring surface of the oil return cavity and the outer ring surface of the oil return groove are the same. The outer ring surface of the oil return cavity and the inner ring surface of the oil return cavity are parallel.

[0021] The sealing packing is an oil-based graphite packing.

[0022] The inner labyrinth cover has several annular grooves on its outer end face (i.e., the outer end face) away from the bearing. Several annular baffles 9 are fixed to the annular outer labyrinth cover 8. The outer labyrinth cover is located outside the inner labyrinth cover. The number of baffles on the outer labyrinth cover is the same as the number of grooves on the inner labyrinth cover. The outer labyrinth cover is fitted over the shaft, and each baffle on the outer labyrinth cover is placed within a groove in the inner labyrinth cover. A pressure sleeve 10 is fixed to the shaft outside the outer labyrinth cover, and the pressure sleeve is bolted to the shaft. The pressure sleeve presses and fixes the outer and inner labyrinth covers tightly.

[0023] A retaining ring 11 is provided in the space between the inner labyrinth cover and the shaft. The retaining ring is fixed on the shaft. The outer ring surface of the retaining ring is in contact with the sealing packing, the inner end of the inner ring of the retaining ring is in contact with the inner retaining plate, and the outer end of the retaining ring is in contact with the outer labyrinth cover.

[0024] The above are merely preferred embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A grease-lubricated sealing structure for the shaft end of a rotating device, comprising an annular inner labyrinth cover (1), characterized in that: The inner labyrinth cover is fixed to the bearing seat (2) of the rotating equipment by bolts. The inner labyrinth cover is sleeved on the outside of the shaft (3). The inner baffle (4) is fixed on the shaft inside the inner labyrinth cover. An annular oil return groove (5) is opened on the end face of the inner labyrinth cover facing the bearing seat. The oil return groove is connected to the bearing in the bearing seat. An annular oil return cavity (6) that is recessed into the inner labyrinth cover is opened at the bottom of the oil return groove near the outer ring edge of the oil return groove. An annular sealing packing installation groove is provided on the inner ring surface of the inner maze cover, which is recessed into the inner maze cover. The annular sealing packing (7) is installed in the sealing packing installation groove. The inner labyrinth cover has several annular grooves on the end face away from the bearing. The annular outer labyrinth cover (8) has several annular baffles (9) fixed on it. The outer labyrinth cover is located outside the inner labyrinth cover. The number of baffles on the outer labyrinth cover is the same as the number of grooves on the inner labyrinth cover. The outer labyrinth cover is sleeved on the outside of the shaft. Each baffle on the outer labyrinth cover is placed in each groove of the inner labyrinth cover. A pressure sleeve (10) is fixed on the shaft outside the outer labyrinth cover. The pressure sleeve is fixed on the shaft by bolts.

2. The grease-lubricated sealing structure for the shaft end of a rotating device according to claim 1, characterized in that: A retaining ring (11) is provided in the space between the inner labyrinth cover and the shaft. The retaining ring is fixed on the shaft. The outer ring surface of the retaining ring is in contact with the sealing packing, the inner end of the retaining ring is in contact with the inner retaining plate, and the outer end of the retaining ring is in contact with the outer labyrinth cover.

3. The grease-lubricated sealing structure for the shaft end of a rotating device according to claim 1 or 2, characterized in that: The diameter of the oil return groove near the bearing end is larger than the diameter of the groove bottom, making the outer ring vertical surface of the oil return groove inclined with an inclination angle >15°. The outer and inner ring surfaces of the oil return cavity are also inclined. The outer ring surface of the oil return cavity and the outer ring surface of the oil return groove are on the same straight line, that is, the inclination angles of the outer ring surface of the oil return cavity and the outer ring surface of the oil return groove are the same. The outer ring surface of the oil return cavity and the inner ring surface of the oil return cavity are parallel.

4. The grease-lubricated sealing structure for the shaft end of a rotating device according to claim 1 or 2, characterized in that: The sealing packing is an oil-based graphite packing.

5. The grease-lubricated sealing structure for the shaft end of a rotating device according to claim 3, characterized in that: The sealing packing is an oil-based graphite packing.

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