CN107171478A - A kind of mechanical seal structure of submersible motor - Google Patents

Abstract

A mechanical seal structure of a submersible motor belongs to the technical field of submersible motors. The invention includes a rotating shaft, a submersible motor body, a sealing seat, a sand throwing ring, a sealing cover, a bearing pressure sleeve and a bearing. The bearing support is installed in the sealing seat and positioned by the bearing pressure sleeve. The upper end of the rotating shaft passes through the sealing cover and is fitted with the sand throwing ring. A mechanical seal assembly for motor sealing is also arranged between the rotating shaft and the sealing cover. The submersible motor with the mechanical seal structure of the present invention can effectively prevent oil overflow and water intrusion, improve the product quality of the submersible motor, and enhance the service life of the submersible motor.

Description

Mechanical seal structure of a submersible motor

technical field

The invention relates to a shaft end sealing structure of a submersible motor, belonging to the technical field of submersible motors.

Background technique

The submersible motor is matched with various types of submersible pumps. It is integrated with the pump. It has been submerged in sewage of various water quality for a long time. The harsh working environment determines that its sealing structure is quite different from that of conventional motors.

The submersible motor consists of a rotor installed on the shaft, a stator installed in the casing, a shaft seal device, a sand prevention device and related parts. There are some disadvantages in existing submersible motors: the shell is composed of a cylindrical shell and upper and lower end covers, both of which are fixed by bolts, and the sealing is relatively difficult; the thrust bearing is installed at the lower end of the shaft, which is not easy to disassemble; Sand, poor waterproof effect, when very small granular foreign matter enters, it will cause the shaft seal to fail, and water will enter the motor and cause the motor to burn.

Contents of the invention

The object of the present invention is to solve the above technical problems, and further provide a mechanical seal structure of a submersible motor.

Technical scheme of the present invention:

A mechanical seal structure of a submersible motor includes a rotating shaft, a submersible motor body, a seal seat, a sand throwing ring, a seal cover, a bearing press sleeve and a bearing. The seal seat is installed on the submersible motor body, and the seal cover passes through bolts and spring washers Fixedly installed on the sealing seat, the rotating shaft is installed in the sealing seat through the bearing support, and is positioned by the bearing pressure sleeve. The upper end of the rotating shaft passes through the sealing cover and is installed in cooperation with the sand throwing ring. sealing components;

The mechanical seal assembly includes a transmission sleeve, a sealing spring, a push block, a dynamic grinding block, a static grinding block, a static ring and a moving ring. The static grinding block is set on the rotating shaft, and the upper end of the static grinding block passes through the anti-rotation pin Fixed on the sealing cover, the lower end of the static grinding block is processed with a notch, the static ring is embedded in the notch at the lower end of the static grinding block, the lower end of the static ring is provided with a moving ring set on the rotating shaft, and the lower end of the moving ring is provided with Push block, the push block extends axially to form an installation step, the upper end of the movable grinding block is set on the moving ring, the lower end of the movable grinding block is installed on the installation step of the push block, the push block The lower end is provided with a transmission sleeve, and the lower end of the transmission sleeve leans against the bearing inner ring of the bearing. The lower end of the transmission sleeve extends axially to form an installation step. on the mounting steps of the blocks and drive sleeves.

Preferably: the inner side of the sealing cover is provided with an annular oil deflecting ring, the static grinding block is embedded in the annular oil deflecting ring, and is fixedly installed with the sealing cover through the anti-rotation pin, and a gap is also processed on the body of the static grinding block Groove, a static grinding block sealing ring is installed in the notch groove.

Preferably: a moving grinding block sealing ring is provided between the moving ring fitted on the rotating shaft and the pushing block, and the moving grinding block sealing ring is arranged in the moving grinding block.

Preferably: a mechanical seal cavity is formed between the sealing cover and the rotating shaft, and the mechanical seal cavity is filled with waterproof sealing damping oil.

Preferably: an oil plug hole is processed on the sealing cover, and the oil plug hole is sealed by a rubber pad and an oil plug.

Preferably: a seal cover sealing ring is installed at the connection between the sealing cover and the sealing seat, and an upper end cover sealing ring is installed at the connection between the sealing seat and the submersible motor body.

The present invention has the following beneficial effects: the mechanical seal structure of a submersible motor of the present invention is closely matched through the surface contact mode between the static ring and the static grinding block, and the sealing cover and the static grinding block are provided with a static grinding block sealing ring, which not only can To achieve a good sealing effect, at the same time, the heat generated by the friction between the static ring and the static grinding block can be quickly transferred to the sealing cover through the annular oil deflector ring, and then dissipate the heat, so that the cooling effect of the mechanical seal component itself is improved. Excellent; the mechanical seal cavity formed by the rotating shaft and the sealing cover is filled with waterproof sealing damping oil, which effectively enhances the internal pressure of the mechanical seal cavity and ensures the sealing performance of the mechanical seal assembly. The submersible motor with the mechanical seal structure of the present invention, It can effectively prevent oil overflow and water immersion, improve the product quality of the submersible motor, and enhance the service life of the submersible motor.

Description of drawings

Fig. 1 is a view of the mechanical seal structure of a submersible motor;

In the figure 1-rotating shaft, 2-submersible motor body, 3-seal seat, 4-sand throwing ring, 5-seal cover, 6-bearing pressure sleeve, 7-bearing, 8-mechanical seal assembly, 9-transmission sleeve, 10 -Sealing spring, 11-push block, 12-dynamic grinding block, 13-static grinding block, 14-static grinding block sealing ring, 15-static ring, 16-moving ring, 17-anti-rotation pin, 18-dynamic grinding block Sealing ring, 19-mechanical seal cavity, 20-oil plug hole, 21-rubber pad, 22-oil plug, 23-sealing cover sealing ring, 24-upper end cover sealing ring, 25-annular oil retaining ring.

detailed description

Specific Embodiment 1: This embodiment is described with reference to FIG. 1. A mechanical seal structure of a submersible motor in this embodiment includes a rotating shaft 1, a submersible motor body 2, a seal seat 3, a sand rejection ring 4, a seal cover 5, and a bearing sleeve 6 and bearing 7, the sealing seat 3 is installed on the submersible motor body 2, the sealing cover 5 is fixedly installed on the sealing seat 3 through bolts and spring washers, the rotating shaft 1 is supported and installed in the sealing seat 3 through the bearing 7, and passed through The bearing pressure sleeve 6 is positioned, the upper end of the rotating shaft 1 passes through the seal cover 5 and is installed in cooperation with the sand throwing ring 4, and a mechanical seal assembly 8 is also arranged between the rotating shaft 1 and the seal cover 5; the mechanical seal assembly 8 includes a transmission Cover 9, sealing spring 10, push block 11, dynamic grinding block 12, static grinding block 13, static ring 15 and moving ring 16, the static grinding block 13 is set on the rotating shaft 1, the upper end of the static grinding block 13 passes through the The revolving pin 17 is fixed on the sealing cover 5, the lower end of the static grinding block 13 is processed with a notch, the static ring 15 is embedded in the notch at the lower end of the static grinding block 13, and the lower end of the static ring 15 is set on the rotating shaft 1 The moving ring 16, the lower end of the moving ring 16 is provided with a push block 11, the push block 11 extends in the axial direction to form an installation step, the upper end of the moving grinding block 12 is sleeved on the moving ring 16, and the moving grinding block 12 The lower end is installed on the installation step of the push block 11, the lower end of the push block 11 is provided with a transmission sleeve 9, the lower end of the transmission sleeve 9 is against the bearing inner ring of the bearing 7, and the lower end of the transmission sleeve 9 extends axially to form a Install the step, the sealing spring 10 is sleeved on the outer ring of the transmission sleeve 9, and the sealing spring 10 leans against the installation steps of the push block 11 and the transmission sleeve 9 respectively. In this way, a mechanical seal chamber 19 is formed between the seal cover 5 and the rotating shaft 1, and a mechanical seal assembly 8 is arranged in the mechanical seal chamber 19. The mechanical seal method of the present invention is realized by two friction pairs of a moving ring and a static ring, one of which is The friction pair is composed of the static ring 15 and the static grinding block 9, the static grinding block 9 forms static friction with the rotating shaft, and the static grinding block 9 cooperates with the annular oil deflecting ring 25 of the sealing cover 5, and the annular oil deflecting ring 25 and the static grinding block 9 The static grinding block sealing ring 14 provided at the contact effectively realizes the first seal of the submersible motor; the other friction pair is a sealing structure formed by the moving grinding block 8 and the moving ring 16 which rotates around the rotating shaft. The dynamic grinding block sealing ring 18 is set, and the second seal is formed under the close cooperation of the dynamic grinding block 8 , the moving ring 16 and the dynamic grinding block sealing ring 18 .

The mechanical seal of the present invention is mainly realized by two friction pairs, the material of the friction pair is YG6, the structure is novel and reasonable, the pressure difference balance device is adopted, the pressure difference is small, the oil leakage is small, and the diving depth is not limited; at the outer end of the sealing cover A sand throwing ring is provided to reduce the damage of sand to the seal; the force of the mechanical seal ring is reasonable; the structure of the dynamic and static ring inserts is reasonable and original, the friction pair is not easily deformed by heat, the reliability of the mechanical seal is high, and the leakage is less than 0.1 ml/hour. The bench test results show that the leakage rate is 0.0272 ml/h, the product quality is stable, and the sealing effect has reached the advanced level, occupying a leading position in China.

Specific Embodiment 2: This embodiment is described in conjunction with FIG. 1 . The inside of the sealing cover 5 described in the mechanical seal structure of a submersible motor according to this embodiment is provided with an annular oil deflecting ring 22 , and the static grinding block 13 is embedded in the annular oil deflecting ring 22 Inside, and through the anti-rotation pin 17 and the sealing cover 5 fixed installation, the static grinding block 13 body is also processed with a gap groove, the static grinding block sealing ring 14 is installed in the gap groove. Set in this way, the static grinding block sealing ring 14 can be effectively sealed to prevent moisture from penetrating into the submersible motor from the static grinding block 13 .

Specific Embodiment 3: This embodiment is described with reference to FIG. 1 . In the mechanical seal structure of a submersible motor in this embodiment, a moving abrasive block seal is also provided between the moving ring 16 and the push block 11 set on the rotating shaft 1. Ring 18, the dynamic grinding block sealing ring 18 is set in the dynamic grinding block 12. In this way, the sealing ring 18 of the movable grinding block and the rotating shaft 1 form a second sealing structure under the close cooperation, so as to prevent moisture from infiltrating into the interior of the motor from the rotating shaft wall of the rotating shaft 1 .

Specific Embodiment Four: This embodiment is described in conjunction with FIG. 1. A mechanical seal cavity 19 is formed between the seal cover 5 and the rotating shaft 1 described in the mechanical seal structure of a submersible motor in this embodiment, and the mechanical seal cavity 19 is filled. There is waterproof sealing damping oil. In this way, the mechanical seal cavity formed by the rotating shaft and the sealing cover is filled with waterproof sealing damping oil, which effectively enhances the internal pressure of the mechanical seal cavity, and under the action of the internal pressure, the gaps of the mechanical seal components are filled until the mechanical seal is ensured. As for the sealing performance of the assembly, the submersible motor with the mechanical seal structure of the present invention can effectively prevent oil overflow and water intrusion.

Embodiment 5: This embodiment is described in conjunction with FIG. 1 . In the mechanical seal structure of a submersible motor of this embodiment, an oil plug hole 20 is processed on the seal cover 5 , and the oil plug hole 20 passes through a rubber pad 21 And oil plug 22 seals. With such an arrangement, the waterproof sealing and damping oil can be filled into the sealed cavity through the oil plug hole 20 .

Specific Embodiment Six: This embodiment is described in conjunction with FIG. 1. A seal cover sealing ring 23 is installed at the joint between the seal cover 5 and the seal seat 3 of a mechanical seal structure of a submersible motor in this embodiment. The junction of the seat 3 and the submersible motor body 2 is provided with an upper end cover sealing ring 24 . In this way, the sealing ring 23 of the sealing cover and the sealing ring 24 of the upper end cover can have a good sealing effect on the submersible motor.

This embodiment is only an exemplary description of this patent, and does not limit its protection scope. Those skilled in the art can also make partial changes to it, as long as it does not exceed the spirit and essence of this patent, all within the protection scope of this patent.

Claims (6)

1. A mechanical seal structure for a submersible motor, characterized in that it includes a rotating shaft (1), a submersible motor body (2), a seal seat (3), a sand throwing ring (4), a sealing cover (5), and a bearing sleeve (6) and bearing (7), described sealing seat (3) is installed on the submersible motor body (2), and sealing cover (5) is fixedly installed on the sealing seat (3) by bolt and spring washer, and rotating shaft (1 ) is supported and installed in the seal seat (3) by the bearing (7), and is positioned by the bearing pressure sleeve (6). A mechanical seal assembly (8) is also provided between the rotating shaft (1) and the sealing cover (5); The mechanical seal assembly (8) includes a transmission sleeve (9), a sealing spring (10), a push block (11), a moving grinding block (12), a static grinding block (13), a static ring (15) and a moving ring (16), the static grinding block (13) is sleeved on the rotating shaft (1), and the upper end of the static grinding block (13) is fixed on the sealing cover (5) by the anti-rotation pin (17), and the static grinding block (13) ) is processed with a notch, the static ring (15) is embedded in the notch at the lower end of the static grinding block (13), and the lower end of the static ring (15) is provided with a moving ring (16) sleeved on the rotating shaft (1) ), the lower end of the moving ring (16) is provided with a push block (11), and the push block (11) extends axially to form an installation step, and the upper end of the moving ring (12) is set on the moving ring (16) Above, the lower end of the movable grinding block (12) is installed on the installation step of the push block (11), and the lower end of the push block (11) is provided with a drive sleeve (9), and the lower end of the drive sleeve (9) leans against the The bearing inner ring of the bearing (7) and the lower end of the drive sleeve (9) extend axially to form an installation step, the sealing spring (10) is set on the outer ring of the drive sleeve (9), and the seal springs (10) respectively lean against On the installation steps of the push block (11) and the drive sleeve (9). 2. The mechanical seal structure of a submersible motor according to claim 1, characterized in that: an annular oil deflector (25) is arranged inside the seal cover (5), and the static grinding block (13) is embedded in the annular retainer In the oil ring (25), and fixedly installed by the anti-rotation pin (17) and the sealing cover (5), the body of the static grinding block (13) is also processed with a gap groove, and a static grinding block is installed in the gap groove Seal ring (14). 3. The mechanical seal structure of a submersible motor according to claim 1, characterized in that: a moving ring (16) set on the rotating shaft (1) and the push block (11) is further provided with a moving seal. A grinding block sealing ring (18), the moving grinding block sealing ring (18) is arranged in the moving grinding block (12). 4. The mechanical seal structure of a submersible motor according to claim 1, characterized in that: a mechanical seal cavity (19) is formed between the seal cover (5) and the rotating shaft (1), and the mechanical seal cavity (19) is filled with waterproof sealing damping oil. 5. The mechanical seal structure of a submersible motor according to claim 1, characterized in that: said sealing cover (5) is processed with an oil plug hole (20), and said oil plug hole (20) passes through Rubber gasket (21) and oil plug (22) are sealed. 6. The mechanical seal structure of a submersible motor according to claim 1, characterized in that: a seal cover sealing ring (23) is installed at the connection between the seal cover (5) and the seal seat (3), An upper end cover sealing ring (24) is installed at the junction of the sealing seat (3) and the submersible motor body (2).