CN110043671B - Novel mechanical seal - Google Patents

Abstract

The invention discloses a novel mechanical seal, which comprises an upper spring seat (2) and a floating ring (5) at the lower part of the upper spring seat, wherein the spring seat (2) is detachably arranged on a rotating shaft (1), a spring (3) is assembled between the spring seat (2) and the floating ring (5), the lower end surface of the floating ring (5) is attached to the upper end surface of a static ring (6), the static ring (6) is assembled on a mounting flange (7) in a sealing way, an elastic sealing ring (4) is assembled on a boss section (51) close to the rotating shaft (1), a groove for accommodating the elastic sealing ring (4) is formed in the middle position of the boss section (51), and the floating ring can axially float and has a certain degree of inclination freedom, can be sealed better, and is simple in structure and convenient to install and use.

Description

New mechanical seal

Technical Field

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

Background technique

At present, mechanical seals are widely used for shaft sealing in places such as transmission pumps and stirring kettles. Figure 1 is a schematic diagram of the structure of a mechanical seal in the prior art. During operation, the floating ring rotates with the shaft and rubs against the end face of the static ring to achieve radial sealing, and the elastic sealing ring seals the gap between the floating ring and the shaft axially. Due to the vibration of the equipment during operation, the shaft at the mechanical seal may jump or shift. At this time, the floating ring is required to be able to float axially and have a certain degree of freedom of tilting, so as to better seal. The axial floating performance of the mechanical seal in the prior art can meet the requirements, but the degree of freedom of tilting is slightly insufficient, mainly because the overall height of the floating ring is large, the radial clearances at the upper and lower parts of the entire height are very small, and the degree of freedom is severely limited. When the shaft at the mechanical seal jumps or shifts due to the vibration of the equipment during operation, due to the limited degree of freedom of tilting 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 remain in close contact and seal.

Summary of the invention

The technical problem to be solved by the present invention is to provide a new type of mechanical seal, the floating ring of which can both float axially and have a certain degree of tilting freedom, thereby achieving better sealing.

The present invention solves the above technical problems by inventing a new type of mechanical seal, including an upper spring seat and a floating ring at its lower part. The spring seat is detachably mounted on the rotating shaft, a spring is arranged between the spring seat and the floating ring, the lower end face of the floating ring is fitted with the upper end face of the static ring, the static ring seal is arranged on the mounting flange, and the elastic sealing ring is arranged on the boss section where the floating ring is close to the rotating shaft, and a groove for accommodating the elastic sealing ring is designed in the middle position of the boss section. The boss section is close to the lower end face of the floating ring, which is to reduce the force on the floating ring when it 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. The small height of the boss section is conducive to improving the tilting freedom of the floating ring. Since the height of the boss section where the floating ring is close to the rotating shaft is not large, as long as there is a little gap between it and the rotating shaft, the floating ring can both float axially and have a certain degree of tilting freedom.

As a further improvement, the upper and lower sides of the boss section are chamfered near the rotating shaft, which is more conducive to improving the tilting freedom of the floating ring and can ensure that the lower end face of the floating ring and the upper end face of the static ring are always in close contact and sealing during operation.

The beneficial effect of the present invention is that when the vibration of the equipment causes the rotating shaft at the mechanical seal to jump or shift during operation, the floating ring can both float axially and have a certain degree of tilt freedom, which can better seal, and the structure is simple and easy to install and use.

BRIEF DESCRIPTION OF THE DRAWINGS

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

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

FIG3 is an enlarged structural diagram of the new mechanical seal floating ring, elastic sealing ring and the rotating shaft.

In the figure: 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 implementation mode of the new mechanical seal, it includes an upper spring seat 2 and a floating ring 5 at its lower portion. When working, the spring seat 2 is installed on the rotating shaft 1. A spring 3 is installed between the spring seat 2 and the floating ring 5. The lower end surface of the floating ring 5 fits with the upper end surface of the static ring 6. The static ring 6 is sealingly installed on the mounting flange 7. The elastic sealing ring 4 is installed on the boss section 51 close to the rotating shaft 1 of the floating ring 5. A groove for accommodating the elastic sealing ring 4 is designed in the middle position of the boss section 51. 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 are processed with chamfers 511 near the rotating shaft 1. With the help of the mounting flange 7, the new mechanical seal is installed to the container insertion port of the rotating shaft that needs to be sealed.

Claims (2)

1. A novel mechanical seal comprises an upper spring seat (2) and a floating ring (5) at its lower portion, wherein the spring seat (2) is detachably mounted on a rotating shaft (1), a spring (3) is arranged between the spring seat (2) and the floating ring (5), the lower end surface of the floating ring (5) is in contact with the upper end surface of a stationary ring (6), and the stationary ring (6) is sealably mounted on a mounting flange (7), wherein the elastic sealing ring (4) is mounted on a boss section (51) close to the rotating shaft (1) of the floating ring (5), a groove for accommodating the elastic sealing ring (4) is arranged in the middle of the boss section (51), the boss section (51) is close to the lower end surface of the floating ring (5), and the height of the boss (51) is taken as low as possible while meeting the design strength requirements. 2. A novel mechanical seal according to claim 1, characterized in that chamfers (511) are processed on the upper and lower sides of the boss section (51) close to the rotating shaft (1).