CN204372163U - Screw machine seal arrangement - Google Patents

Abstract

A spiral mechanical sealing device relates to the technical field of machinery, in particular to a dynamic sealing device adopting a spiral structure. It includes a rotating shaft (1), a stationary part (2) and a sealing device. The sealing device includes a movable oil deflector (3) and a correspondingly matched bell (4), the movable oil deflector (3) and the bell ( 4) They are all rings, and the outer periphery of the movable oil retaining ring (3) is provided with a spiral oil throwing line (5), and the movable oil retaining ring (3) is fixed on the rotating shaft (1), and the bell jar (4) is set On the periphery of the moving oil deflecting ring (3) and fixed on the stationary part (2), when the rotating shaft (1) rotates, the spiral oil throwing line (5) can be used to enter the moving oil deflecting ring (3) and the bell The oil in the annular gap between the covers (4) is thrown back inward. It has the advantages of simple and reasonable structure, reliable operation and good sealing effect.

Description

Spiral mechanical seal

technical field

The utility model relates to the technical field of machinery, in particular to a dynamic sealing device adopting a spiral structure.

Background technique

In mechanical equipment, due to the existence of factors such as wear and tear between the parts with relative movement, when the static seal alone cannot achieve a good sealing effect, the structure of the dynamic seal is often used between the moving part and the stationary part to achieve sealing. Purpose. The currently used dynamic sealing structure can indeed have a good sealing effect when the equipment is running, but in the process of actual use, these structures still have some shortcomings. For example, due to the oil saturation at the seal, the existing sealing structure may have the problem of oil leakage from the dynamic seal when there is a pressure difference between the inside and outside, when the oil level is high, and when the equipment is out of service.

Contents of the invention

The technical problem to be solved by the utility model is to provide a spiral mechanical sealing device to solve the problem of poor sealing between the moving part and the stationary part in the existing structure.

The technical solution of the utility model is: it includes a rotating shaft, a stationary part and a sealing device, and the sealing device includes a movable oil retaining ring and a correspondingly matched bell jar, the movable oil retaining ring and the bell jar are both rings, The outer periphery of the movable oil deflecting ring is provided with a spiral oil throwing line, the movable oil deflecting ring is fixed on the rotating shaft, the bell is set on the periphery of the moving oil deflecting ring and fixed on the stationary part, when the rotating shaft rotates, the spiral throwing oil The oil line can throw back the oil that has entered the annular gap between the movable oil retaining ring and the bell to the inside.

The technical effect of the utility model is: it has the advantages of simple and reasonable structure, reliable operation and good sealing effect, and can achieve a very reliable sealing effect through the spiral structure when the equipment is running. When the equipment is stopped, the static seal can be used to assist the sealing. After the static seal is worn, the leaked oil can be recovered through a special return channel to prevent leakage and pollution.

Description of drawings

Fig. 1 is the half-cut structural representation of the utility model;

Fig. 2 is the side view structural representation of the utility model;

Fig. 3 is the A-A view of Fig. 2;

Fig. 4 is a B-B view of Fig. 2 .

Detailed ways

As shown in Figures 1 to 4, it includes a rotating shaft 1, a stationary part 2 and a sealing device. It is a ring body, and the outer periphery of the dynamic oil retaining ring 3 is provided with a spiral oil throwing line 5, the movable oil retaining ring 3 is fixed on the rotating shaft 1, and the bell cover 4 is set on the periphery of the movable oil retaining ring 3 and fixed on the stationary On part 2, when the rotating shaft 1 rotates, the oil liquid entering the annular gap between the movable oil deflecting ring 3 and the bell 4 can be thrown back inward by the helical oil throwing line 5 .

An annular cavity is provided between the outer end of the dynamic oil deflecting ring 3 and the rotating shaft 1, and the movable oil deflecting ring 3 is provided with an oil throwing hole 6 on the side wall of the annular cavity section, and the rotating shaft 1 is covered with a static retainer Oil ring 7, the outer circumference of the static oil retaining ring 7 is provided with a serrated ring groove 8 on the inner section, and the inner section is located in the annular cavity at the outer end of the dynamic oil retaining ring 3, and the static oil retaining ring 7 is fixed on the outer end of the On the bell jar 4 or the stationary part 2.

The static oil deflecting ring 7 is provided with an oil return hole 9 on at least the lower side wall.

A sealing ring is provided between the static oil retaining ring 7 and the rotating shaft 1 for sealing.

An oil return ring groove 10 is provided on the inner wall of the shaft hole of the stationary member 2 outside the bell housing 4 , and an oil return pipe 11 is provided at the bottom of the oil return ring groove 10 .

A sealing ring is provided at the outer end between the stationary part 2 and the rotating shaft 1 for sealing.

The embodiment shown in the accompanying drawings of the utility model is a split-type spiral sealing device, which consists of four parts: one is a dynamic oil retaining ring with a spiral line on the outer circle, and the other is an O-shaped sealing ring on the inner circle side. N bell mouth-shaped static oil retaining rings, the third is a sealing bell jar, and the fourth is a sealing end cover with an oil return groove and an oil return hole at the end. The whole set of screw sealing devices is in two symmetrical halves, fastened on the shaft of the rotating machine, and tightened and fixed with the lug screws on the end cover, so that the two halves of the sealing devices form a complete set of sealing devices.

After the lubricating oil meets the rotating movable oil retaining ring, the lubricating oil is driven back into the oil pool in the bearing bush under the action of the helix on the outer circle of the movable retaining oil ring and the sealing bell. If there is still a very small part of lubricating oil falling on the surface of the static oil retaining ring through the axial gap between the dynamic oil retaining ring and the static retaining oil ring, the lubricating oil will flow from the bell mouth height of the static retaining oil ring to the The root of the bell mouth, and then flows from the root to the inner circle of the rotating dynamic oil deflector ring. Since there is an oil throwing hole on the moving oil retaining ring, the lubricating oil flowing to the inner circle of the moving oil retaining ring, under the action of the rotation of the moving oil retaining ring, the lubricating oil is thrown to the inner circle of the sealing bell through the oil throwing hole, and lubricated Under the action of the helix on the outer circle of the movable oil ring and the sealing bell, the oil is returned to the oil pool in the bearing bush, thus forming an internal oil return system.

If the oil level in the bearing bush is higher than that of the rotating shaft when the rotating machine is stationary, since the split-type screw sealing device is a composite sealing form, when the rotating machine is stationary, the lubricating oil is due to the O-shaped sealing ring and the inner circle of the stationary oil retaining ring. Under the action of the O-ring seal at the end of the end cover, the lubricating oil will not overflow the shaft seal of the end cover. If the O-ring runs for a long time, there will be friction with the rotating shaft so that there will be a gap between the O-ring and the rotating shaft. At this time, the lubricating oil will overflow from the gap of the O-ring of the stationary oil ring and flow to the end of the sealing end cover. Through the oil return hole and oil return pipe in the tank, it is pumped back into the oil pool of the bearing bush under the action of the oil pump. When the machine is running, the split-type screw sealing device is not limited by the oil level, and the lubricating oil will not leak from the end cover side shaft seal.

Claims (6)

1. A spiral mechanical sealing device, including a rotating shaft (1), a stationary part (2) and a sealing device, characterized in that the sealing device includes a movable oil deflector ring (3) and a corresponding bell jar (4), Both the movable oil deflecting ring (3) and the bell (4) are circular, and the outer periphery of the movable oil deflecting ring (3) is provided with a spiral oil throwing line (5), and the movable oil deflecting ring (3) is fixed on the rotating shaft (1), the bell (4) is set on the periphery of the movable oil deflecting ring (3) and fixed on the stationary part (2). When the rotating shaft (1) rotates, the spiral oil throwing line (5) can The oil that has entered the annular gap between the movable oil retaining ring (3) and the bell housing (4) is thrown back inward. 2. The screw mechanical seal device according to claim 1, characterized in that, an annular cavity is provided between the outer end of the dynamic oil deflecting ring (3) and the rotating shaft (1), and the dynamic oil deflecting ring (3) ) is provided with an oil throwing hole (6) on the side wall of the annular chamber section, and a static oil retaining ring (7) is set on the shaft (1), and the outer periphery of the static oil retaining ring (7) is provided with a serrated ring groove (8), and the inner section is located in the annular cavity at the outer end of the dynamic oil deflector ring (3), and the static oil deflector ring (7) is fixed on the bell jar (4) or the stationary part (2) at the outer end . 3. The screw mechanical seal device according to claim 2, characterized in that, the static oil deflector ring (7) is provided with an oil return hole (9) at least on the lower side wall. 4. The screw mechanical seal device according to claim 2 or 3, characterized in that a sealing ring is provided between the stationary oil retaining ring (7) and the rotating shaft (1). 5. The screw mechanical seal device according to claim 1, characterized in that, the inner wall of the shaft hole of the stationary part (2) located outside the bell jar (4) is provided with an oil return ring groove (10), and the oil return The bottom of the ring groove (10) is provided with an oil return pipe (11). 6 . The spiral mechanical seal device according to claim 1 or 5 , characterized in that, a sealing ring is provided at the outer end between the stationary part ( 2 ) and the rotating shaft ( 1 ).