CN216045447U

CN216045447U - External single-screw pump shaft seal structure

Info

Publication number: CN216045447U
Application number: CN202122348835.4U
Authority: CN
Inventors: 张磊; 汪长春; 叶海波
Original assignee: Huangshan Single Screw Pump Co ltd
Current assignee: Huangshan Single Screw Pump Co ltd
Priority date: 2021-09-27
Filing date: 2021-09-27
Publication date: 2022-03-15
Anticipated expiration: 2031-09-27

Abstract

The utility model discloses an external single-screw pump shaft seal structure, which belongs to the technical field of single-screw pumps and comprises a transmission shaft, wherein a bearing seat is arranged outside the transmission shaft, a mechanical sealing element is arranged at one end of the bearing seat, the mechanical sealing element is arranged outside a suction chamber shell, a bearing assembly is arranged at the other end of the bearing seat, and an independent lubricating oil cavity is enclosed between the mechanical sealing element, the bearing assembly and the transmission shaft and the bearing seat.

Description

External single-screw pump shaft seal structure

Technical Field

The utility model relates to the technical field of single-screw pumps, in particular to an externally-mounted single-screw pump shaft seal structure.

Background

The single-screw pump needs shaft seal to seal between the transmission shaft and the suction chamber, and the common shaft seal type comprises a packing type and a mechanical seal type. A mechanical seal is a device used to solve the problem of sealing between a rotating shaft and a machine body.

At present, the shaft seal structure of the single-screw pump usually adopts an internal mechanical seal, the internal mechanical seal generally needs to install a mounting shell between a suction chamber shell and a bearing seat or a bracket for installing a transmission shaft, and the mechanical seal is installed on one side of the mounting shell facing to a suction chamber, so that the mechanical seal structure is completely positioned in a conveying medium. Because the suction chamber shell is provided with the feeding port, the mixture containing particle impurities enters from the feeding port, and the particle impurities easily cause abrasion and breakage of elastic elements, friction pairs and the like in mechanical seal in the conveying process of the mixture, thereby causing the pump shaft seal to lose efficacy, causing medium leakage and ensuring the whole pump to be incapable of normally running.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problems, the utility model provides an external single-screw pump shaft seal structure, which is characterized in that an internal shaft seal is changed into an external structure, and a vulnerable part is designed to be installed outside a suction chamber shell, so that the installation structure is simplified, the damage of a conveying medium to the vulnerable part is effectively avoided, the normal operation of the shaft seal is ensured, and the failure probability of the shaft seal is greatly reduced.

In order to achieve the purpose, the technical scheme adopted by the utility model for solving the technical problems is as follows: the external single-screw pump shaft seal structure comprises a transmission shaft, wherein a bearing seat is arranged outside the transmission shaft, a mechanical sealing element is arranged at one end of the bearing seat, the mechanical sealing element is arranged outside a suction chamber shell, a bearing assembly is arranged at the other end of the bearing seat, and independent lubricating oil cavities are enclosed among the mechanical sealing element, the bearing assembly, the transmission shaft and the bearing seat.

The bearing seat comprises an installation cavity I, an installation cavity II and a lubricating cavity connected between the installation cavity I and the installation cavity II, one end of the mechanical sealing element is installed in the installation cavity I, the other end of the mechanical sealing element extends into the lubricating cavity, the bearing assembly is installed in the installation cavity II, and the lubricating oil cavity is formed between the lubricating cavity and the transmission shaft.

The aperture of the lubricating cavity is smaller than the apertures of the mounting cavity I and the mounting cavity II.

Mechanical seal includes the machine seal gland, the one end of machine seal gland can be dismantled through the bolt and connect I department of installation cavity, the other end of machine seal gland stretches into in the lubrication cavity, install quiet ring in the machine seal gland, one side of quiet ring is provided with the rotating ring, the rotating ring is fixed on the transmission shaft.

And an organic seal spacer bush is further fixedly sleeved on the transmission shaft, and the machine seal spacer bush is abutted to one end, far away from the machine seal gland, of the movable ring.

The bearing assembly comprises two bearings and a bearing spacer sleeve connected between the two bearings, and the lubricating oil cavity is defined by the mechanical seal gland, the bearing seat, the transmission shaft and one of the bearings.

The utility model has the beneficial effects that:

the structure of the bearing seat is improved, so that the mechanical sealing element is arranged at one end of the bearing seat and is arranged outside the suction chamber shell, and the mechanical sealing element, the bearing assembly, the transmission shaft and the bearing seat form an independent lubricating oil cavity for lubricating the mechanical sealing element and the bearing assembly.

Drawings

The contents of the expressions in the various figures of the present specification and the labels in the figures are briefly described as follows:

FIG. 1 is a schematic structural view of the present invention;

the labels in the above figures are: 1. the mechanical seal comprises a transmission shaft, 2 parts of a bearing seat, 21 parts of mounting chambers I and 22 parts of mounting chambers II and 23 parts of a lubricating chamber, 3 parts of a mechanical seal, 31 parts of a mechanical seal cover, 32 parts of a static ring, 33 parts of a dynamic ring, 34 parts of a mechanical seal spacer, 4 parts of a bearing assembly, 41 parts of a bearing, 42 parts of a bearing spacer and 5 parts of a suction chamber shell.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and the following embodiments are used for illustrating the present invention and are not intended to limit the scope of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The specific implementation scheme of the utility model is as follows: as shown in fig. 1, an external single-screw pump shaft seal structure comprises a transmission shaft 1, a bearing seat 2 is installed outside the transmission shaft 1, a mechanical sealing element 3 is installed at one end of the bearing seat 2, and the mechanical sealing element 3 is installed outside a suction chamber shell 5, so that damage of a conveying medium to the mechanical sealing element 3 is effectively avoided, and the service life of the mechanical sealing element 3 is prolonged; the bearing assembly 4 is installed to the other end of bearing frame 2, encloses into independent lubricating oil chamber between mechanical seal 3, bearing assembly 4, transmission shaft 1 and the bearing frame 2, can be used to lubricated mechanical seal 3 and bearing assembly 4, has guaranteed the normal operating of bearing seal, has prolonged the life of bearing seal, greatly reduced the inefficacy probability of bearing seal.

Specifically, bearing frame 2 wherein includes installation cavity I21, installation cavity II 22 reaches the lubrication cavity 23 of connecting between them, the one end of mechanical seal 3 is installed in installation cavity I21, the other end of mechanical seal 3 stretches into in lubrication cavity 23, make mechanical seal 3 install outside suction chamber casing 5, bearing assembly 4 installs in installation cavity II 22, form the lubricating chamber between lubrication cavity 23 and the transmission shaft 1, the aperture of lubrication cavity 23 wherein is less than the aperture of installation cavity I21 and installation cavity II 22, the installation location of mechanical seal 3 and bearing assembly 4 has been realized, make the structural design of bearing frame 2 reasonable, the installation casing of installation mechanical seal 3 has been saved, the mounting structure has been simplified, make installation and dismantlement more convenient.

Specifically, the mechanical sealing element 3 includes a mechanical seal gland 31, one end of the mechanical seal gland 31 is detachably connected to the position of the mounting cavity i 21 through a bolt, the other end of the mechanical seal gland 31 extends into the lubricating cavity 23, a stationary ring 32 is mounted in the mechanical seal gland 31, a moving ring 33 is arranged on one side of the stationary ring 32, the moving ring 33 is fixed on the transmission shaft 1 and rotates along with the transmission shaft 1, a mechanical seal spacer 34 is further sleeved on the transmission shaft 1, the mechanical seal spacer 34 is fixed on the transmission shaft 1 through a set screw, the mechanical seal spacer 34 abuts against one end, away from the mechanical seal gland 31, of the moving ring 33, the effect of stopping and limiting is achieved, and the problem that the moving ring 33 moves in the rotating process is solved.

Specifically, the bearing assembly 4 includes two bearings 41 and a bearing spacer 42 connected therebetween, the bearing spacer 42 can press and position inner rings of the two bearings 41, a lubricating oil chamber is defined between the mechanical seal cover 31, the bearing seat 2, the transmission shaft 1 and one of the bearings 41, the lubricating oil chamber can provide lubricating oil for the mechanical seal 3 and one of the bearings 41, the bearing 41 outside the bearing seat 2 can be filled with the lubricating oil after the bearing cover is detached, the normal operation of the shaft seal is ensured, the service life of the shaft seal is prolonged, and the failure probability of the shaft seal is further reduced.

The mounting method of the shaft seal structure comprises the following steps: firstly, sleeving a machine seal spacer bush 34 on a transmission shaft 1, adjusting the position, and then locking and fixing the machine seal spacer bush 34 on the transmission shaft 1 through a set screw; then, two bearings 41 and the bearing spacer 42 between them are installed on the transmission shaft 1, the transmission shaft 1 together with the bearing assembly 4 and the machine seal spacer 34 are installed in the bearing seat 2, and the bearing gland is locked; finally, the movable ring 33 is mounted on the drive shaft 1 so that one end of the movable ring 33 abuts against the mechanical seal spacer 34, the stationary ring 32 is mounted on the mechanical seal cover 31, and the mechanical seal cover 31 is mounted on the bearing housing 2.

In conclusion, the utility model changes the built-in shaft seal into the built-out structure, and the vulnerable part is arranged from the inner part of the suction chamber shell to the outer part of the shell, thereby not only simplifying the installation structure, but also effectively avoiding the damage of the conveying medium to the vulnerable part, ensuring the normal operation of the shaft seal and greatly reducing the failure probability of the shaft seal.

While the foregoing is directed to the principles of the present invention, other and further embodiments of the utility model may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow.

Claims

1. The utility model provides an adorn single screw pump shaft seal structure outward, its characterized in that includes the transmission shaft, install the bearing frame outward the transmission shaft, mechanical seal is installed to the one end of bearing frame, mechanical seal installs outside the aspiration chamber casing, the bearing assembly is installed to the other end of bearing frame, enclose into independent lubricating oil chamber between mechanical seal, bearing assembly, transmission shaft and the bearing frame.

2. The externally-mounted single-screw pump shaft seal structure according to claim 1, wherein: the bearing seat comprises an installation cavity I, an installation cavity II and a lubricating cavity connected between the installation cavity I and the installation cavity II, one end of the mechanical sealing element is installed in the installation cavity I, the other end of the mechanical sealing element extends into the lubricating cavity, the bearing assembly is installed in the installation cavity II, and the lubricating oil cavity is formed between the lubricating cavity and the transmission shaft.

3. The externally-mounted single-screw pump shaft seal structure according to claim 2, wherein: the aperture of the lubricating cavity is smaller than the apertures of the mounting cavity I and the mounting cavity II.

4. The externally-mounted single-screw pump shaft seal structure according to claim 2, wherein: mechanical seal includes the machine seal gland, the one end of machine seal gland can be dismantled through the bolt and connect I department of installation cavity, the other end of machine seal gland stretches into in the lubrication cavity, install quiet ring in the machine seal gland, one side of quiet ring is provided with the rotating ring, the rotating ring is fixed on the transmission shaft.

5. The externally-mounted single-screw pump shaft seal structure according to claim 4, wherein: and an organic seal spacer bush is further fixedly sleeved on the transmission shaft, and the machine seal spacer bush is abutted to one end, far away from the machine seal gland, of the movable ring.

6. The externally-mounted single-screw pump shaft seal structure according to claim 4, wherein: the bearing assembly comprises two bearings and a bearing spacer sleeve connected between the two bearings, and the lubricating oil cavity is defined by the mechanical seal gland, the bearing seat, the transmission shaft and one of the bearings.