CN110043671A - Mechanical sealing - Google Patents

Abstract

The invention discloses a new type of mechanical seal, which comprises an upper spring seat (2) and a floating ring (5) at its lower part, the spring seat (2) is detachably mounted on a rotating shaft (1), and the spring seat (2) is connected to a floating ring (5). A spring (3) is fitted between the rings (5), the lower end face of the floating ring (5) is fitted with the upper end face of the static ring (6), and the static ring (6) is sealed and fitted on the mounting flange (7), elastically The sealing ring (4) is fitted on the boss section (51) where the floating ring (5) is close to the rotating shaft (1), and a groove for accommodating the elastic sealing ring (4) is designed in the middle of the boss section (51). The floating ring can not only float axially but also have a certain degree of inclination freedom, which can better seal, and has a simple structure, which is convenient for installation and use.

Description

New mechanical seal

technical field

The invention belongs to the technical field of mechanical seals, and is used for the sealing of a rotating shaft at the intersection of a container insertion port.

Background technique

At present, mechanical seals are widely used in rotary shaft seals in places such as transmission pumps and stirring tanks. FIG. 1 is a schematic structural diagram of a mechanical seal in the prior art. When working, the floating ring rotates with the rotating shaft and the end face between the static ring is fitted and rubbed to achieve radial sealing, and the elastic sealing ring is axially sealed in the gap between the floating ring and the rotating shaft. Since the vibration of the equipment at work will cause the shaft at the mechanical seal to jump or shift, it is required that the floating ring can both float axially and have a certain degree of inclination freedom, so as to better seal. The axial floating performance of the prior art mechanical seal can meet the requirements, but the degree of freedom of inclination is slightly insufficient, mainly because the overall height of the floating ring is large, the radial clearance at the upper and lower parts of the entire height is very small, and the degree of freedom is seriously affected. limit. When the vibration of the equipment causes the vibration of the rotating shaft or the displacement of the shaft at the mechanical seal during work, due to the limited tilting freedom of the floating ring, it is impossible to ensure that the lower end face of the floating ring and the upper end face of the static ring are kept in close contact and sealing.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is to provide a new type of mechanical seal whose floating ring can not only float axially but also have a certain degree of inclination freedom, so as to achieve better sealing.

The present invention solves the above-mentioned technical problems, and adopts the technical means to invent a new type of mechanical seal, which includes an upper spring seat and a floating ring at the lower part. Spring, the lower end face of the floating ring is fitted with the upper end face of the static ring, the static ring seal is fitted on the mounting flange, the elastic sealing ring is fitted on the boss section near the floating ring and the rotating shaft, and the middle position of the boss section is designed to accommodate Groove for elastic sealing ring. The boss section is close to the lower end face of the floating ring, which is to reduce the force when the floating ring is subjected to the pressure in the container. The height of the boss section is taken as a low value under the premise of meeting the design strength requirements, and the height of the boss section is small, which is beneficial to improve the tilting freedom of the floating ring. Because the height of the boss section of the floating ring close to the rotating shaft is not large, as long as there is a little gap between the new mechanical seal and the rotating shaft, the floating ring can not only float axially but also have a certain degree of freedom in inclination.

As a further improvement, the upper and lower sides of the boss section close to the rotating shaft are chamfered, which is more conducive to improving the degree of freedom of the floating ring inclination, and can ensure that the lower end face of the floating ring and the upper end face of the static ring are kept in contact at all times during the working process. seal.

The beneficial effect of the invention is that when the vibration of the equipment makes the rotating shaft at the mechanical seal jump or displace during operation, the floating ring can not only float axially but also have a certain degree of inclination freedom, which can better seal, and has a simple and convenient structure. Install and use.

Description of drawings

FIG. 1 is a schematic structural diagram of a mechanical seal in the prior art.

Figure 2 is a schematic diagram of the new mechanical seal structure.

Figure 3 is an enlarged schematic view of the structure of the new mechanical seal floating ring and the elastic seal at the place where the rotating shaft cooperates.

In the picture: 1. Rotating shaft; 2. Spring seat; 3. Spring; 4. Elastic sealing ring; 5. Floating ring; 6. Static ring; 7. Mounting flange.

Detailed ways

As an embodiment of the new mechanical seal, it includes an upper spring seat 2 and a floating ring 5 at its lower part. During operation, the spring seat 2 is installed on the rotating shaft 1, and a spring 3 is fitted between the spring seat 2 and the floating ring 5. The lower end face of the floating ring 5 is fitted with the upper end face of the static ring 6, the static ring 6 is sealed and fitted on the mounting flange 7, and the elastic sealing ring 4 is fitted on the boss section 51 near the floating ring 5 and the rotating shaft 1. The boss section The middle position of 51 is designed with a groove for accommodating the elastic sealing ring 4. The boss section 51 is consistent with the lower end surface of the floating ring 5. The upper and lower sides of the boss section 51 near the rotating shaft 1 are processed with chamfers 511. With the help of the mounting flange 7 The new mechanical seal is fitted to the shaft requiring a sealed container insertion port.

Claims (2)

1. a kind of mechanical sealing, the floating ring (5) including upper springs seat (2) and its underpart, spring base (2) is removably It is mounted on shaft (1), is fitted between spring base (2) and floating ring (5) spring (3), floating ring (5) lower end surface and stationary ring (6) upper surface is bonded, and stationary ring (6) sealing is fitted on mounting flange (7), it is characterised in that elastic seal ring (4) is fitted in floating Rotating ring (5) and shaft (1) close boss section (51), the design of boss section (51) middle position have receiving elastic seal ring (4) Groove, boss section (51) highly take under the premise of meeting design strength requirement low close to floating ring (5) lower end surface, boss (51) Value.

2. a kind of mechanical sealing according to claim 1, it is characterised in that the two sides up and down of boss section (51) are close to be turned Axis (1) position is machined with chamfering (511).