Mechanical seal

Abstract

The utility model discloses a mechanical seal, which relates to the technical field of sealing, and comprises a stirring shaft, a moving ring elastically arranged on the stirring shaft and a fixed ring fixedly arranged, a pressing seat and an oil cavity fixedly connected with the pressing seat are arranged outside the stirring shaft, and the inner circumference of the oil cavity is matched with the pressing seat to fix the fixed ring. The movable ring and the static ring are both of a staggered split structure. The centering device has the advantages of convenience in replacement and simplicity in centering operation.

Description

Technical Field

[0001] This utility model relates to the field of sealing technology, specifically to a mechanical seal. Background Technology

[0002] Existing mechanical seals have a rotating ring and a stationary ring. The rotating ring rotates together with the stirring shaft, while the stationary ring is fixed in the pressure seat and prevented from rotating by an anti-rotation pin. The rotating and stationary rings are an integral structure. However, this structure is inconvenient to replace the rotating and stationary rings, which requires disassembling the transmission device, shaft and other components. This can easily lead to misalignment of the disassembled parts. Utility Model Content

[0003] To overcome the shortcomings of the prior art, this utility model provides a mechanical seal that is easy to repair and replace.

[0004] The technical solution adopted by this utility model is as follows: a mechanical seal, including a stirring shaft, a rotating ring elastically mounted on the stirring shaft, and a stationary ring fixedly disposed thereon. The stirring shaft is provided with a pressure seat and an oil cavity fixedly connected to the pressure seat. The inner circumference of the oil cavity cooperates with the pressure seat to fix the stationary ring. Both the rotating ring and the stationary ring adopt a staggered split structure.

[0005] The staggered split structure uses inclined overlapping.

[0006] The staggered split structure uses stepped surface overlap.

[0007] The stirring shaft is fitted with a spring seat, a push ring that slides on the spring seat, and an elastic element that abuts against the spring seat and the push ring. The moving ring slides on the spring seat and contacts and engages with the push ring.

[0008] O-rings are provided between the stationary ring and the pressure seat, and between the rotating ring and the spring seat. The O-rings adopt a separable structure with 15°-60° inclined overlap.

[0009] The oil chamber is equipped with an oil sight glass.

[0010] The upper end of the pressure seat is provided with a partition plate that is inserted between the stationary ring and the stirring shaft and has a gap between them. The pressure seat is provided with a purging channel that communicates with the gap.

[0011] The upper surface of the partition is higher than the upper surface of the stationary ring, thus forming a dam opening.

[0012] The beneficial effects of this utility model are: the mechanical seal's dynamic and static rings in this technical solution are both staggered and split, which facilitates overlapping and alignment, and allows for quick replacement of the mechanical seal's dynamic and static rings without disassembling other parts; in addition, an oil chamber for lubrication is added to the mechanical seal, which can be used for both dry and wet applications, and rotating parts will not be exposed, thus improving operational safety. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the mechanical seal in an embodiment of the present invention.

[0014] Figure 2 This is a schematic diagram of the structure of an O-ring seal.

[0015] Figure 3 This is a schematic diagram of the structure of Embodiment 1.

[0016] Figure 4 This is a schematic diagram of the structure of Example 2. Detailed Implementation

[0017] The embodiments of this utility model will be further described below with reference to the accompanying drawings:

[0018] As shown in the figure, a mechanical seal includes a stirring shaft 1, a rotating ring 2 elastically mounted on the stirring shaft 1, and a stationary ring 3 fixedly disposed thereon. The stirring shaft 1 is provided with a pressure seat 4 and an oil cavity 5 fixedly connected to the pressure seat 4. The inner circumference of the oil cavity 5 cooperates with the pressure seat 4 to fix the stationary ring 3. Both the rotating ring 2 and the stationary ring 3 adopt a staggered split structure. In this technical solution, the rotating and stationary rings of the mechanical seal adopt a staggered split structure, which facilitates overlapping and alignment, allowing for quick replacement of the rotating and stationary rings of the mechanical seal without disassembling other components. Furthermore, the addition of an oil cavity for lubrication to the mechanical seal allows for both dry and wet lubrication, and the rotating components are not exposed, improving operational safety.

[0019] The staggered split structure in this technical solution has two embodiments;

[0020] Example 1: As Figure 2 As shown, the staggered split structure adopts a sloping overlap.

[0021] Example 2: Figure 3 As shown, the staggered split structure adopts stepped surface overlap.

[0022] Both of the above embodiments can achieve the technical effect of convenient overlapping and alignment.

[0023] The stirring shaft 1 is fitted with a spring seat 6, a push ring 7 slidably mounted on the spring seat 6, and an elastic element 12 abutting between the spring seat 6 and the push ring 7. The moving ring 2 is slidably mounted on the spring seat 6 and in contact with the push ring 7. The spring seat is firmly fixed to the stirring shaft by a set pin. A double-ended stud is provided between the push ring and the spring seat. The bottom end of the double-ended stud is fixedly connected to the push ring, and the upper end of the double-ended stud passes through the spring seat and is connected to a nut. The nut can limit the sliding distance of the push ring. The elastic element provides an elastic preload force for the moving ring to contact the stationary ring.

[0024] An O-ring seal 8 is provided between the stationary ring 3 and the pressure seat 4, and between the moving ring 2 and the spring seat 6. The O-ring seal 8 adopts a separable structure with 15°-60° inclined overlap to increase the overlap area and enhance the strength.

[0025] The upper end of the pressure seat 4 is provided with a partition plate 11 that is inserted between the stationary ring 3 and the stirring shaft 1 and has a gap with both. The pressure seat 4 is provided with a purging channel 10 that connects to the gap, which can be used for sewage purging; thus solving the problems of difficult disassembly and assembly and pollution of traditional mechanical seals.

[0026] The upper surface of the partition 11 is higher than the upper surface of the stationary ring 3, thus forming a dam opening; it can ensure that the wear material generated by the operation of the mechanical seal does not enter the container cavity, and can be used in hygienic and clean food and pharmaceutical applications.

[0027] In the description of this utility model, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0028] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. Furthermore, in the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0029] Please note to all technical personnel: Although this utility model has been described according to the specific embodiments above, the inventive concept of this utility model is not limited to this utility model. Any modifications that utilize the inventive concept will be included within the scope of protection of this patent.

Claims

1. A mechanical seal, characterized in that: It includes a stirring shaft (1), a moving ring (2) elastically mounted on the stirring shaft (1), and a stationary ring (3) fixedly set. The stirring shaft (1) is provided with a pressure seat (4) and an oil cavity (5) fixedly connected to the pressure seat (4). The inner circumference of the oil cavity (5) cooperates with the pressure seat (4) to fix the stationary ring (3). The moving ring (2) and the stationary ring (3) both adopt a staggered split structure.

2. The mechanical seal according to claim 1, characterized in that: The staggered split structure uses inclined overlapping.

3. The mechanical seal according to claim 1, characterized in that: The staggered split structure uses stepped surface overlap.

4. The mechanical seal according to claim 1, characterized in that: The stirring shaft (1) is fitted with a spring seat (6), a push ring (7) that slides on the spring seat (6), and an elastic element (12) that abuts between the spring seat (6) and the push ring (7). The moving ring (2) slides on the spring seat (6) and contacts and engages with the push ring (7).

5. The mechanical seal according to claim 4, characterized in that: O-rings (8) are provided between the stationary ring (3) and the pressure seat (4) and between the moving ring (2) and the spring seat (6). The O-rings (8) adopt a separable structure with 15°-60° inclined overlap.

6. The mechanical seal according to claim 1, characterized in that: The oil cavity (5) is equipped with an oil sight glass (9).

7. The mechanical seal according to claim 1, characterized in that: The upper end of the pressure seat (4) is provided with a partition (11) that is inserted between the stationary ring (3) and the stirring shaft (1) and has a gap with both of them. The pressure seat (4) is provided with a purging channel (10) that connects the gap.

8. The mechanical seal according to claim 7, characterized in that: The upper surface of the partition (11) is higher than the upper surface of the static ring (3), thus forming a dam opening.

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