CN110469675B

CN110469675B - Mechanical seal for side-feeding stirrer

Info

Publication number: CN110469675B
Application number: CN201910889341.1A
Authority: CN
Inventors: 倪欣远; 王奇; 李晓龙
Original assignee: Jinan Ruigao Machinery Technology Co ltd
Current assignee: Jinan Ruigao Machinery Technology Co ltd
Priority date: 2019-09-19
Filing date: 2019-09-19
Publication date: 2020-10-09
Anticipated expiration: 2039-09-19
Also published as: CN110469675A

Abstract

The invention discloses a mechanical seal for a side-entry agitator, which belongs to the technical field of mechanical seal and comprises a rotating shaft, a mounting frame, a main mechanical seal and an auxiliary mechanical seal, wherein the mounting frame is fixedly connected with the mounting frame through bolts, the mounting frame is of a hollow structure, the main mechanical seal and the auxiliary mechanical seal are both arranged between the mounting frame and the rotating shaft, the main mechanical seal comprises a connecting assembly, a main shaft sleeve, a main seal assembly and an outer seal assembly, the connecting assembly is fixedly connected with the rotating shaft, the main shaft sleeve is sleeved on the connecting assembly, the main shaft sleeve is provided with a main seal seat fixedly connected with the main shaft sleeve, the main seal assembly and the outer seal assembly are both arranged in the middle of the main seal seat, and the main seal seat is fixedly connected with one end of the mounting frame through bolts. The double-layer sealing structure can improve the sealing effect, can also prolong the fixed length of the rotating shaft, reduces the polarization and abrasion of the rotating shaft during working, and prolongs the service life of the double-layer sealing structure.

Description

Mechanical seal for side-feeding stirrer

Technical Field

The invention relates to the technical field of mechanical seals, in particular to a mechanical seal for a side-feeding stirrer.

Background

The mechanical seal belongs to one of mechanical basic elements with precision and complex structure, and is a key part of equipment such as various pumps, reaction synthesis kettles, turbine compressors, submersible motors and the like. The side-entry agitator is an agitator in which an agitator is mounted on the side wall of the equipment cylinder. The corresponding stirrer is selected according to the physical properties, capacity and stirring purpose of different media. Therefore, mechanical seals are also required on the agitator shaft of side entry agitators to seal the gap between the agitator shaft and the agitator.

However, the conventional mechanical seal for a side-entry agitator has the following disadvantages in use; first, current mechanical seal maintains inconveniently, need when dismantling the whole (mixing) shaft and the agitator and unpack apart, dismantles mechanical seal again and gets off to maintain, and its dismouting step is comparatively loaded down with trivial details, consuming time and wasting force. Second, the (mixing) shaft is when rotating, and its tip drives the stirring rake pivoted in time, can lead to the tip of (mixing) shaft to take place the vibration of skew axis to increase the wearing and tearing between (mixing) shaft and the mechanical seal, this can reduce mechanical seal's life. Thirdly, when the mechanical seal in the prior art works, the stirring shaft can bring great damage to the mechanical seal once the stirring shaft moves axially, and the function of the existing mechanical seal is not perfect.

Disclosure of Invention

The invention aims to provide a mechanical seal for a side-feeding stirrer, which aims to solve the technical problems that the mechanical seal is inconvenient to disassemble and the polarization of a stirring shaft cannot be reduced in the prior art.

The invention provides a mechanical seal for a side-entry agitator, which comprises a rotating shaft and a mounting frame, and comprises a fixing frame, a main mechanical seal and an auxiliary mechanical seal, wherein the fixing frame is fixedly connected with the mounting frame through bolts, the fixing frame is of a hollow structure, the main mechanical seal and the auxiliary mechanical seal are both arranged between the fixing frame and the rotating shaft, the main mechanical seal comprises a connecting assembly, a main shaft sleeve, a main seal assembly and an outer seal assembly, the connecting assembly is fixedly connected with the rotating shaft, the main shaft sleeve is sleeved on the connecting assembly, a main seal seat fixedly connected with the main shaft sleeve is arranged on the main shaft sleeve, the main seal assembly and the outer seal assembly are both arranged in the middle of the main seal seat, and the main seal seat is fixedly connected with one end of the fixing frame.

Further, coupling assembling includes the adapter sleeve, the cross section of adapter sleeve is personally submitted the ring form and the one end of adapter sleeve is equipped with rather than fixed connection's spacing piece, the middle part of spacing piece is equipped with the through-hole, the pivot includes first portion and second portion, the diameter of first portion is greater than the diameter of second portion, the diameter of first portion equals the internal diameter of adapter sleeve, the diameter of second portion equals the internal diameter of spacing piece, screw fixed connection is passed through with the one end of first portion in the outside of first portion and spacing piece to the adapter sleeve cover.

Further, the main seal assembly comprises a driving ring and a main static ring, the main shaft sleeve is sleeved on the connecting sleeve, the main seal seat sleeve is sleeved on the main shaft sleeve, the main static ring and the driving ring are sleeved on the main shaft sleeve, one side of the main static ring and one side of the driving ring are attached to each other, one side of the driving ring is provided with a plurality of insertion grooves which are distributed circumferentially, each insertion groove is internally provided with a spring sleeve which is matched with the insertion groove in an insertion mode, each spring sleeve is internally provided with a first spring, and one end of each first spring is abutted against the outer seal assembly.

Further, the external seal subassembly includes outer rotating ring and outer quiet ring, outer quiet ring and outer rotating ring are all established and are sheathe in the main shaft and the laminating of one side of outer quiet ring and outer rotating ring, the laminating of one end and the main seal seat of outer quiet ring, all the one end of first spring all is connected with outer rotating ring.

Further, the main seal receptacle is sleeved with a shell, two ends of the shell are fixedly connected with the main seal receptacle through screws, an inner cavity is formed among the shell, the main seal receptacle and the main shaft sleeve, one end of the main seal receptacle is provided with a liquid inlet pipe and a liquid discharge pipe, and the liquid inlet pipe and the liquid discharge pipe are communicated with the inner cavity.

Further, first sealing rings are arranged between the spindle sleeve and the rotating shaft, between the main sealing seat and the main static ring, between the main sealing seat and the outer static ring and between the two ends of the shell and the main sealing seat.

Further, supplementary mechanical seal includes supplementary axle sleeve, supplementary seal receptacle, supplementary rotating ring and supplementary quiet ring, supplementary axle sleeve cover is established in the pivot, supplementary seal receptacle cover is established on supplementary axle sleeve, pass through screw fixed connection between supplementary seal receptacle and the mount, supplementary rotating ring and supplementary quiet ring are all established and are laminated on supplementary axle sleeve and one side of supplementary rotating ring and supplementary quiet ring, the one end and the supplementary seal receptacle fixed connection of supplementary quiet ring, one side of supplementary rotating ring is equipped with the second spring that a plurality of is the circumference and distributes, all the one end of second spring all with supplementary seal receptacle fixed connection.

Further, second sealing rings are arranged between the auxiliary sealing seat and the fixing frame, between the auxiliary sealing seat and the auxiliary moving ring, between the auxiliary sealing seat and the auxiliary static ring and between the auxiliary shaft sleeve and the rotating shaft.

Compared with the prior art, the invention has the beneficial effects that:

firstly, the main mechanical seal and the auxiliary mechanical seal are both arranged on the fixing frame to form an integrated structure, so that the main mechanical seal and the auxiliary mechanical seal can be integrally disassembled and assembled, and are convenient to maintain and replace;

in addition, the main mechanical seal can be detached and replaced independently, the main mechanical seal can be detached from the rotating shaft only by connecting the connecting sleeve with the rotating contact, the rotating shaft and the auxiliary mechanical seal are not detached, the detachment is prevented more simply, and the auxiliary mechanical seal can still play a sealing effect when the main mechanical seal is detached, and leakage is not worried about;

the combination of the main mechanical seal and the auxiliary mechanical seal can also prolong the fixed length of the rotating shaft, so that the connecting of the rotating shaft is firmer, the eccentric vibration strength of the rotating shaft in the working process can be inhibited, and the abrasion of the rotating shaft and the main mechanical seal and the auxiliary mechanical seal is reduced, thereby prolonging the service life of the invention;

the double-layer seal formed by the main mechanical seal and the auxiliary mechanical seal can improve the sealing effect of the invention.

Secondly, the movable range of the driving ring can be prolonged through the matching action of the spring sleeve and the first spring, so that when the rotating shaft axially moves in the working process, the compensation can be better carried out, the damage of the driving ring is avoided, and the service life of the driving ring is prolonged;

in addition, the matching of the spring sleeve and the first spring also increases the moving range of the outer rotating ring, the compensation capacity of the outer rotating ring and the driving ring for the axial movement of the rotating shaft can be improved again through the matching of the outer rotating ring and the driving ring, and the service life of the invention is further prolonged.

Thirdly, an inner cavity is formed among the shell, the main seal seat and the main shaft sleeve, and is communicated with a liquid inlet pipe and a liquid discharge pipe; the inner cavity is formed to facilitate the flushing of the main mechanical seal by flushing fluid, in addition, when the invention is used, because of the existence of the auxiliary mechanical seal, the leakage problem of the main mechanical seal is not needed to be excessively cared, so that lubricating fluid can be directly filled in the inner cavity, on one hand, the lubricating fluid can play a role in lubricating the main mechanical seal to reduce the abrasion generated when the main mechanical seal is used, and on the other hand, the lubricating fluid can play a role in cooling to prevent the main mechanical seal from being damaged at high temperature.

Drawings

In order to more clearly illustrate the implementation prevention or technical solutions in the prior art of the present invention, the drawings used in the description of the implementation prevention or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some implementation prevention of the present invention, and other drawings can be obtained according to these drawings for those skilled in the art without creative efforts.

FIG. 1 is a top view of the present invention;

FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1;

FIG. 3 is an enlarged view at B in FIG. 2;

FIG. 4 is an enlarged view at C of FIG. 2;

fig. 5 is an enlarged view at D in fig. 2.

Reference numerals:

the sealing device comprises a rotating shaft 1, a first part 11, a second part 12, a mounting frame 2, a fixing frame 3, a main mechanical seal 4, a connecting assembly 41, a connecting sleeve 411, a limiting piece 412, a through hole 413, a main shaft sleeve 42, a main seal assembly 43, a driving ring 431, a main static ring 432, a spring sleeve 433, a first spring 434, an outer seal assembly 44, an outer dynamic ring 441, an outer static ring 442, a main seal seat 45, an auxiliary mechanical seal 5, an auxiliary shaft sleeve 51, an auxiliary seal seat 52, an auxiliary dynamic ring 53, an auxiliary static ring 54, a second spring 55, a shell 6, an inner cavity 7, a liquid inlet pipe 8, a liquid outlet pipe 9, a first seal ring 101 and a second seal ring 102.

Implementation of prevention

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention.

The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention.

All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "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. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

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; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Referring to fig. 1 to 5, the embodiment of the present invention provides a mechanical seal for a side-entry mixer, which includes a rotating shaft 1, a mounting frame 2, a fixing frame 3, a main mechanical seal 4 and an auxiliary mechanical seal 5, the fixed mount 3 is fixedly connected with the mounting rack 2 through bolts, the fixed mount 3 is of a hollow structure, the main mechanical seal 4 and the auxiliary mechanical seal 5 are both arranged between the fixed frame 3 and the rotating shaft 1, the primary mechanical seal 4 comprises a connecting assembly 41, a spindle cover 42, a primary seal assembly 43 and an outer seal assembly 44, the connecting component 41 is fixedly connected with the rotating shaft 1, the main shaft sleeve 42 is sleeved on the connecting component 41, the main shaft sleeve 42 is provided with a main sealing seat 45 fixedly connected with the main shaft sleeve, the main sealing assembly 43 and the outer sealing assembly 44 are both arranged in the middle of the main sealing seat 45, and the main sealing seat 45 is fixedly connected with one end of the fixed frame 3 through a bolt; the main mechanical seal 4 and the auxiliary mechanical seal 5 are both arranged on the fixed frame 3, the modularized structure enables the main mechanical seal 4 and the auxiliary mechanical seal 5 to be integrally disassembled and assembled, the maintenance and the replacement are convenient, in addition, the main mechanical seal 4 can also be independently disassembled and replaced, the maintenance prevention of the invention is increased, the maintenance can be conveniently performed according to the most convenient prevention according to the situation, the use is convenient, in addition, the leakage and other situations can be effectively prevented through the double-layer sealing effect of the main mechanical seal 4 and the auxiliary mechanical seal 5, the sealing effect of the invention is improved, meanwhile, the matching work of the main sealing component 43 and the outer sealing component 44 in the main sealing component 43 also further improves the effect of the main mechanical seal 4, the fixed length of the rotating shaft 1 can be prolonged through the combination of the main mechanical seal 4 and the auxiliary mechanical seal 5, the connection of the rotating shaft 1 is firmer, the eccentric vibration intensity of the rotating shaft 1 in the working process can be further inhibited, and the abrasion of the rotating shaft 1 and the main mechanical seal 4 and the auxiliary mechanical seal 5 is reduced, so that the service life of the invention is prolonged.

Specifically, the connecting assembly 41 includes a connecting sleeve 411, the cross section of the connecting sleeve 411 is circular, one end of the connecting sleeve 411 is provided with a limiting piece 412 fixedly connected with the connecting sleeve 411, the middle part of the limiting piece 412 is provided with a through hole 413, the rotating shaft 1 includes a first part 11 and a second part 12, the diameter of the first part 11 is larger than that of the second part 12, the diameter of the first part 11 is equal to the inner diameter of the connecting sleeve 411, the diameter of the second part 12 is equal to that of the limiting piece 412, the connecting sleeve 411 is sleeved outside the first part 11, and the limiting piece 412 is fixedly connected with one end of the first part 11 through a screw; the connecting sleeve 411 is sleeved on the rotating shaft 1, the main mechanical seal 4 is sleeved on the connecting sleeve 411, therefore, when the connecting sleeve 411 is detached, the main mechanical seal 4 can be detached from the rotating shaft 1 as long as the connecting sleeve 411 is in contact with the rotating shaft, and the rotating shaft 1 and the auxiliary mechanical seal 5 are not required to be detached, so that the detachment is simpler in prevention, convenient to maintain and convenient to use.

Specifically, the main sealing assembly 43 includes a driving ring 431 and a main stationary ring 432, the main shaft sleeve 42 is sleeved on the connecting sleeve 411, the main sealing seat 45 is sleeved on the main shaft sleeve 42, the main stationary ring 432 and the driving ring 431 are both sleeved on the main shaft sleeve 42, one side of the main stationary ring 432 and one side of the driving ring 431 are attached, one side of the driving ring 431 is provided with a plurality of circumferentially distributed insertion grooves, each insertion groove is internally provided with a spring sleeve 433 in insertion fit with the insertion groove, each spring sleeve 433 is internally provided with a first spring 434, and one end of each first spring 434 is abutted against the outer sealing assembly 44; the movable range of the driving ring 431 can be extended through the cooperation of the spring sleeve 433 and the first spring 434, so that when the rotating shaft 1 axially moves in the working process, the compensation can be better performed, the damage of the driving ring can be avoided, and the service life of the driving ring is prolonged.

Specifically, the outer sealing assembly 44 includes an outer moving ring 441 and an outer stationary ring 442, the outer stationary ring 442 and the outer moving ring 441 are both sleeved on the spindle sleeve 42, one side of the outer stationary ring 442 is attached to one side of the outer moving ring 441, one end of the outer stationary ring 442 is attached to the main seal seat 45, and one end of each of the first springs 434 is connected to the outer moving ring 441; the matching of the spring sleeve 433 and the first spring 434 also increases the moving range of the outer moving ring 441, and the compensation capability of the outer moving ring 441 and the driving ring 431 on the axial movement of the rotating shaft 1 can be further improved through the matching of the outer moving ring 441 and the driving ring 431, so that the service life of the invention is further prolonged.

Specifically, a shell 6 is sleeved on the main seal holder 45, two ends of the shell 6 are fixedly connected with the main seal holder 45 through screws, an inner cavity 7 is formed among the shell 6, the main seal holder 45 and the main shaft sleeve 42, one end of the main seal holder 45 is provided with a liquid inlet pipe 8 and a liquid outlet pipe 9, and the liquid inlet pipe 8 and the liquid outlet pipe 9 are both communicated with the inner cavity 7; the inner cavity 7 is formed to facilitate the washing of the main mechanical seal 4 by using washing liquid, in addition, when the invention is used, due to the existence of the auxiliary mechanical seal 5, the leakage problem of the main mechanical seal 4 does not need to be excessively cared, so that lubricating liquid can be directly filled in the inner cavity 7, on one hand, the main mechanical seal 4 can be lubricated, the abrasion of the main mechanical seal 4 during use is reduced, and on the other hand, the temperature reduction effect can be realized, so that the high-temperature damage of the main mechanical seal 4 is prevented.

Specifically, the first sealing rings 101 are respectively arranged between the spindle sleeve 42 and the rotating shaft 1, between the main sealing seat 45 and the main stationary ring 432, between the main sealing seat 45 and the outer stationary ring 442, and between the two ends of the housing 6 and the main sealing seat 45, and the first sealing rings 101 are mainly used for sealing.

Specifically, the auxiliary mechanical seal 5 includes an auxiliary shaft sleeve 51, an auxiliary seal seat 52, an auxiliary rotating ring 53 and an auxiliary stationary ring 54, the auxiliary shaft sleeve 51 is sleeved on the rotating shaft 1, the auxiliary seal seat 52 is sleeved on the auxiliary shaft sleeve 51, the auxiliary seal seat 52 is fixedly connected with the fixing frame 3 through screws, the auxiliary rotating ring 53 and the auxiliary stationary ring 54 are both sleeved on the auxiliary shaft sleeve 51 and one side of the auxiliary rotating ring 53 and one side of the auxiliary stationary ring 54 are attached, one end of the auxiliary stationary ring 54 is fixedly connected with the auxiliary seal seat 52, one side of the auxiliary rotating ring 53 is provided with a plurality of second springs 55 distributed circumferentially, and one end of each of the second springs 55 is fixedly connected with the auxiliary seal seat 52; the auxiliary mechanical seal 5 can form primary seal between the rotating shaft 1 and the mounting frame 2, and the leakage problem is prevented.

Specifically, second seal rings 102 are respectively arranged between the auxiliary seal seat 52 and the fixed frame 3, between the auxiliary seal seat 52 and the auxiliary moving ring 53, between the auxiliary seal seat 52 and the auxiliary stationary ring 54, and between the auxiliary shaft sleeve 51 and the rotating shaft 1; the second sealing ring 102 has a sealing effect.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. The utility model provides a side entry mechanical seal for agitator, includes pivot (1) and mounting bracket (2), its characterized in that: including mount (3), main mechanical seal (4) and supplementary mechanical seal (5), be hollow structure through bolt fixed connection and mount (3) between mount (3) and mounting bracket (2), main mechanical seal (4) and supplementary mechanical seal (5) are all installed between mount (3) and pivot (1), main mechanical seal (4) are including coupling assembling (41), main shaft cover (42), main seal subassembly (43) and external seal subassembly (44), coupling assembling (41) and pivot (1) fixed connection, main shaft cover (42) cover is established on coupling assembling (41), be provided with main seal receptacle (45) rather than fixed connection on main shaft cover (42), main seal subassembly (43) and external seal subassembly (44) all set up the middle part at main seal receptacle (45), main seal receptacle (45) passes through bolt fixed connection with the one end of mount (3), coupling assembling (41) are including adapter sleeve (411), the cross section of adapter sleeve (411) is personally submitted the ring form and the one end of adapter sleeve (411) is equipped with rather than fixed connection's spacing piece (412), the middle part of spacing piece (412) is equipped with through-hole (413), pivot (1) are including first portion (11) and second part (12), the diameter of first portion (11) is greater than the diameter of second part (12), the diameter of first portion (11) equals the internal diameter of adapter sleeve (411), the diameter of second part (12) equals the internal diameter of spacing piece (412), screw fixed connection is passed through at the outside of first portion (11) and spacing piece (412) and the one end of first portion (11) to adapter sleeve (411) cover.

2. A side entry mixer mechanical seal according to claim 1, wherein: the main seal assembly (43) comprises a driving ring (431) and a main static ring (432), the spindle sleeve (42) is sleeved on the connecting sleeve (411), the main seal seat (45) is sleeved on the spindle sleeve (42), the main static ring (432) and the driving ring (431) are both sleeved on the spindle sleeve (42), one side of the main static ring (432) is attached to one side of the driving ring (431), a plurality of insertion grooves distributed circumferentially are formed in one side of the driving ring (431), each insertion groove is internally provided with a spring sleeve (433) matched with the insertion groove in an insertion manner, each spring sleeve (433) is internally provided with a first spring (434), and one end of each first spring (434) is abutted against the outer seal assembly (44).

3. A side entry mixer mechanical seal according to claim 2, wherein: the outer seal assembly (44) comprises an outer rotating ring (441) and an outer stationary ring (442), the outer stationary ring (442) and the outer rotating ring (441) are all sleeved on the spindle sleeve (42) and are attached to one side of the outer stationary ring (442) and one side of the outer rotating ring (441), one end of the outer stationary ring (442) is attached to the main seal seat (45), and all of one end of the first spring (434) is connected with the outer rotating ring (441).

4. A side entry mixer mechanical seal according to claim 3, wherein: the utility model discloses a liquid storage tank, including main seal receptacle (45), main seal receptacle (45) go up the cover and be equipped with shell (6), the both ends of shell (6) all pass through screw fixed connection with main seal receptacle (45), form inner chamber (7) between shell (6), main seal receptacle (45) and main shaft cover (42), the one end of main seal receptacle (45) is equipped with feed liquor pipe (8) and fluid-discharge tube (9), feed liquor pipe (8) and fluid-discharge tube (9) all communicate with inner chamber (7).

5. A side entry mixer mechanical seal according to claim 3, wherein: and first sealing rings (101) are arranged between the main shaft sleeve (42) and the rotating shaft (1), between the main sealing seat (45) and the main static ring (432), between the main sealing seat (45) and the outer static ring (442) and between the two ends of the shell (6) and the main sealing seat (45).

6. A side entry mixer mechanical seal according to claim 1, wherein: supplementary mechanical seal (5) are established on pivot (1) including supplementary axle sleeve (51), supplementary seal receptacle (52), supplementary rotating ring (53) and supplementary quiet ring (54), supplementary axle sleeve (51) cover, supplementary seal receptacle (52) cover is established on supplementary axle sleeve (51), pass through screw fixed connection between supplementary seal receptacle (52) and mount (3), supplementary rotating ring (53) and supplementary quiet ring (54) are all established on supplementary axle sleeve (51) and are laminated on one side of supplementary rotating ring (53) and supplementary quiet ring (54), the one end and supplementary seal receptacle (52) fixed connection of supplementary quiet ring (54), one side of supplementary rotating ring (53) is equipped with a plurality of and is second spring (55) that the circumference distributes, all the one end of second spring (55) all with supplementary seal receptacle (52) fixed connection.

7. The mechanical seal for a side entry mixer of claim 6, wherein: and second sealing rings (102) are arranged between the auxiliary sealing seat (52) and the fixed frame (3), between the auxiliary sealing seat (52) and the auxiliary movable ring (53), between the auxiliary sealing seat (52) and the auxiliary stationary ring (54) and between the auxiliary shaft sleeve (51) and the rotating shaft (1).