CN111188788A

CN111188788A - Mechanical seal with pre-pressing structure

Info

Publication number: CN111188788A
Application number: CN202010148838.0A
Authority: CN
Inventors: 韦尚鹏; 陈春生
Original assignee: Honghao Pump Industry Co ltd
Current assignee: Honghao Pump Industry Co ltd
Priority date: 2020-03-05
Filing date: 2020-03-05
Publication date: 2020-05-22

Abstract

The invention belongs to the field of mechanical seal for pumps, and discloses a mechanical seal with a pre-press loading structure, which aims to solve the problems of the mechanical seal in a centrifugal pump in the prior art. The mechanical seal with the pre-pressing structure can pre-assemble the cooling cover, the spring seat, the spring and the static ring into a whole through the spring seat, and is convenient for subsequent assembly. The invention has simple and compact structure and effectively prolongs the service life of the mechanical seal.

Description

Mechanical seal with pre-pressing structure

Technical Field

The invention relates to the field of mechanical seals for pumps, in particular to a mechanical seal with a pre-pressing structure.

Background

The mechanical seal is one of the vulnerable parts of the centrifugal pump, and particularly when corrosive particle-carrying media are conveyed, the service life of the mechanical seal is shorter. At present, the mechanical seal comprises a container type mechanical seal structure and a non-container type mechanical seal structure, the container type mechanical seal structure is compact, easy to install, slightly long in service life and high in replacement cost; the frequency of mechanical seal replacement of the corrosion-resistant and wear-resistant centrifugal pump is very high, so that non-integrated mechanical seals are generally adopted. However, the non-integrated mechanical seal has the disadvantages of complicated installation procedure, uneven stress on the movable ring and the static ring, short service life, and the mechanical seal has the spring forms of a large spring, a small spring, a corrugated pipe and the like; the cooling mode of the mechanical seal is mostly tap water cooling, but some sites do not have tap water or are inconvenient to cool the mechanical seal by tap water, so that heat generated by a friction pair of the mechanical seal cannot be taken away, the mechanical seal is damaged due to overhigh temperature, and the technical problem cannot be solved in the prior art.

Disclosure of Invention

The invention aims to solve the problems of mechanical seals in centrifugal pumps in the prior art and provides a mechanical seal with a pre-pressing structure, which is compact in structure, convenient to install and long in service life.

In order to achieve the purpose, the invention adopts the following technical scheme:

a mechanical seal with a pre-pressing structure comprises a cooling cover, wherein a spring is arranged in the cooling cover, one end of the spring is clamped in the cooling cover, the other end of the spring is provided with a spring seat, the spring seat is pressed in the cooling cover through a pressing ring arranged in the cooling cover, the pressing ring can prevent the spring seat from moving, a shaft sleeve is arranged in the spring seat and the spring, one end of the spring seat, far away from the spring, is matched and clamped with a static ring arranged in one side of the cooling cover, the other side of the static ring is provided with a movable ring, a movable ring seat rotating integrally with a shaft is arranged in the movable ring, the end part of the movable ring seat is matched and clamped with one end of the shaft sleeve, the other end of the shaft sleeve is clamped with a pumping ring rotating integrally with the shaft sleeve, a round hole is formed in the pumping ring and communicated with a cooling oil channel arranged on the cooling cover, the cooling oil channel is communicated with a cooling oil outlet, and a framework oil seal is arranged at the position of the cooling cover where the pumping ring is arranged.

Furthermore, the outer end face of the spring seat is provided with a rotation prevention table, the end part of the rotation prevention table is provided with a limiting table, a plurality of press fitting grooves into which the limiting table can be arranged are uniformly distributed on the press fitting ring along the circumferential direction, and a plurality of anti-rotation grooves which can be matched with the rotation prevention table and can be arranged in the press fitting ring are uniformly distributed on the press fitting ring.

Furthermore, the pumping ring is evenly provided with a plurality of round holes along the circumferential direction, and the two sides of the round holes are provided with throttling grooves along the circumferential direction of the pumping ring.

Furthermore, a spring seat boss is arranged on the end face, far away from the spring, of one side of the spring seat, and the spring seat boss is matched with a groove formed in the end face of the stationary ring in installation.

Furthermore, the movable ring seat is in transmission with the shaft through a key, and one side, close to the pumping ring, of the shaft sleeve is fixedly connected with the shaft through a pin.

Furthermore, the contact position of the movable ring seat and the movable ring is sealed through a movable ring O-shaped ring, the static ring and the cooling cover are sealed through a static ring O-shaped ring, and the movable ring seat and the shaft sleeve installation position are sealed through a sealing gasket.

Furthermore, one side of the framework oil seal is provided with an elastic retainer ring.

Furthermore, one end of the spring is provided with a baffle ring, the baffle ring is provided with an oil passage, and the baffle ring and the inner side of the cooling cover are of an integrated structure.

Furthermore, the cooling oil inlet oil nozzle and the cooling oil outlet oil nozzle are respectively provided with a plug.

Furthermore, the cooling cover is made of glass fiber reinforced plastics, and the movable ring and the static ring are made of stainless steel or glass fiber reinforced plastics.

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

the mechanical seal with the pre-pressing structure can pre-assemble the cooling cover, the spring seat, the spring and the static ring into a whole through the spring seat, and is convenient for subsequent assembly. In addition, the spring seat is pressed on the other side of the press-fitting ring, so that the spring seat is prevented from rotating, the static ring is prevented from rotating, the structure is simple and compact, the installation and operation are convenient, anti-rotating parts such as pins or pins are omitted, and leakage points of cooling oil are reduced. Effectively prolongs the service life of the mechanical seal. The wear-resistant centrifugal pump is suitable for the corrosion-resistant wear-resistant centrifugal pump, reduces the loss of spare parts, and ensures the normal operation of the pump. The pumping ring of the invention provides power for the circulation of cooling oil in the process of rotating along with the pump shaft, the continuous circulation of the cooling oil brings heat generated inside the mechanical seal into the oil pot, and the heat exchange is carried out between the cooling oil and air after the cooling oil enters the oil pot and then enters the mechanical seal.

The outer end face of the spring seat is provided with the anti-rotation table, the end part of the anti-rotation table is provided with the limiting table, when the anti-rotation table is installed, the spring seat is pressed into and penetrates through the press-fitting ring through the press-fitting grooves uniformly distributed on the press-fitting ring, the spring rebounds, the anti-rotation table on the spring seat enters the anti-rotation grooves on the press-fitting ring, the limiting table is limited at the side part of the press-fitting ring, the anti-rotation table and the anti-rotation grooves are installed in a matched mode, the spring seat is guaranteed not to rotate, and.

The spring seat boss on the spring seat is matched with the groove on the end surface of the static ring. Make quiet ring and spring holder installation as an organic whole, it is more stable, can not take place to rotate.

One side of the framework oil seal is provided with an elastic retainer ring for fixing the framework oil seal and sealing cooling oil by utilizing the framework oil seal.

Drawings

FIG. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a schematic structural view of the spring seat of the present invention.

FIG. 3 is a schematic view of the structure of the cooling jacket of the present invention.

Fig. 4 is a right side view of fig. 2.

Fig. 5 is a side view of the press-fitting ring of the present invention.

Fig. 6 is a schematic diagram of the pumping ring of the present invention.

FIG. 7 is a front view of the pumping ring of the present invention.

Fig. 8 is a partially enlarged schematic view of fig. 1.

The reference numerals have the following meanings: 1. a movable ring seat; 2. a moving ring O-shaped ring; 3. a moving ring; 4. a gasket; 5. a stationary ring; 6. a stationary ring O-shaped ring; 7. a cooling jacket; 8. a spring seat; 9. a shaft sleeve; 10. a cooling oil inlet nozzle tip; 11. a spring; 12. a cooling oil outlet nozzle tip; 13. a pin; 14. a pumping ring; 15. framework oil seal; 16. a shaft; 17. a rotation prevention platform; 18. a limiting table; 19. pressing and assembling the groove; 20. an anti-rotation slot; 21. a cooling oil passage; 22. a throttling groove; 23. a circular hole; 24. a baffle ring; 25. a circlip; 26. a spring seat boss; 27. and (6) pressing and assembling the ring.

Detailed Description

The invention is further described with reference to the following figures and detailed description.

As shown in fig. 1-8, a mechanical seal with a pre-press mounting structure comprises a cooling cover 7, a spring 11 is mounted in the cooling cover 7, a baffle ring 24 is arranged at one end of the spring 11, an oil passage is arranged on the baffle ring 24, and the baffle ring 24 and the inner side of the cooling cover 7 are of an integral structure. One end of spring 11 clamps and blocks ring 24 department, the other end of spring 11 is equipped with spring holder 8, spring holder 8 is in cooling jacket 7 through the pressure equipment ring 27 pressure equipment that sets up in cooling jacket 7, and pressure equipment ring 27 can prevent the drunkenness of spring holder 8, axle sleeve 9 is equipped with in spring holder 8 and the spring 11, spring holder 8 keeps away from the one end of spring 11 and installs and clamp with the cooperation of the quiet ring 5 of installing in cooling jacket 7 one side inside, spring holder 8 keeps away from a side end face of spring 11 and is equipped with spring holder boss 26, spring holder boss 26 and the recess cooperation installation that sets up at quiet ring 5 terminal surface. The opposite side of quiet ring 5 is equipped with rotating ring 3, installs in the rotating ring 3 with the integrative pivoted rotating ring seat 1 of axle 16, rotating ring seat 1 and axle 16 pass through the key transmission, the tip of rotating ring seat 1 and the one end cooperation of axle sleeve 9, rotating ring seat 1 and axle sleeve 9 installation department are sealed through sealed 4, axle sleeve 9 is installed on axle 16 and axle sleeve 9 is close to one side of pumping ring 14 and is passed through round pin 13 and axle 16 fixed connection.

The other end of the shaft sleeve 9 is clamped with a pumping ring 14 which rotates integrally with the shaft sleeve 9, one end of the pumping ring 14 is clamped on the shaft sleeve 9, the other end of the pumping ring 14 is positioned by a round nut, the shaft sleeve 9 and the pumping ring 14 are ensured to rotate together with the shaft 16, a plurality of round holes 23 are uniformly distributed in the pumping ring 14 along the circumferential direction, and throttling grooves 22 are formed in two sides of each round hole 23 along the circumferential direction of the pumping ring 14. Round hole 23 and the coolant oil passageway 21 intercommunication of setting on cooling jacket 7, coolant oil passageway 21 is for seting up the oil groove along annular 3/4 in cooling jacket 7, coolant oil passageway 21 and the coolant oil export glib talker 12 intercommunication of setting on cooling jacket 7, still be equipped with coolant oil import glib talker 10 on cooling jacket 7, framework oil blanket 15 is equipped with to cooling jacket 7 installation pumping ring 14 department, one side-mounting circlip 25 of framework oil blanket 15, all be equipped with the plug on coolant oil import glib talker 10, the coolant oil export glib talker 12. (the longitudinal dotted lines of the cooling oil inlet nozzle tip 10 and the cooling oil outlet nozzle tip 12 in fig. 3 are schematically shown as a partial rotation view, and are actually horizontally arranged) the outer end surface of the spring seat 8 is provided with a rotation prevention table 17, the end part of the rotation prevention table 17 is provided with a limit table 18, a plurality of press fitting grooves 19 into which the limit table 18 can be inserted are uniformly distributed on the press fitting ring 27 in the circumferential direction, and a plurality of rotation prevention grooves 20 into which the rotation prevention table 17 can be fitted are also uniformly distributed on the press fitting ring 27 in the circumferential direction.

The cooling cover 7 is made of stainless steel or glass fiber reinforced plastic, and the moving ring 3 and the static ring 5 are both made of silicon carbide. The contact part of the movable ring seat 1 and the movable ring 3 is sealed through a movable ring O-shaped ring 2, and the static ring 5 and the cooling cover 7 are sealed through a static ring O-shaped ring 6.

During installation, shaft sleeve 9 is fixed on shaft 16 through round pin 13, pack spring 11 into from the one end of cooling jacket 7, then pack spring holder 8 into cooling jacket 7, and guarantee that spacing platform 18 passes from pressure equipment groove 19, the pressure equipment makes spring holder 8 be located one side of pressure equipment ring 27, then rotatory spring holder 8, make prevent changeing platform 17 and prevent changeing groove 20 and align, under the effect of spring force of spring 11, spring holder 8 kick-backs, make prevent that revolving stage 16 cooperation clamps in preventing changeing groove 20, play the effect that spring holder 8 prevented changeing, then pack quiet ring 5 and quiet ring seal 6 into, make spring holder boss 26 and the recess cooperation on the quiet ring 5, prevent that quiet ring 5 from rotating. Then the movable ring 3 and the movable ring seat 1 are installed, the movable ring seat 1 and the shaft 16 are installed through keys, the pumping ring 14 is installed on the shaft sleeve 9 in a pressing mode from the other end of the cooling cover 7, the framework oil seal 15 is installed, the elastic check ring 25 is installed to limit and fix the framework oil seal 15, and the pumping ring 14 is located through the round nut.

The pumping ring 14 provides power for the circulation of cooling oil, the cooling oil enters the pumping ring 14 and is conveyed to the cooling oil channel 21 through the round hole 23, then enters the oil pot from the cooling oil outlet nozzle 12, the heat generated inside the mechanical seal is brought into the oil pot through continuous circulation, and enters the oil pot to exchange heat with air and then enters the cooling cover 7 of the mechanical seal.

Claims

1. The utility model provides a pre-compaction dress structure mechanical seal, includes cooling jacket (7), installs spring (11) in cooling jacket (7), and the one end of spring (11) clamps in cooling jacket (7), and the other end of spring (11) is equipped with spring holder (8), characterized by: the spring seat (8) is pressed in the cooling cover (7) through a pressing ring (27) arranged in the cooling cover (7), the pressing ring (27) can prevent the spring seat (8) from moving, a shaft sleeve (9) is arranged in the spring seat (8) and the spring (11), one end, far away from the spring (11), of the spring seat (8) is matched and clamped with a static ring (5) arranged in one side of the cooling cover (7), a movable ring (3) is arranged on the other side of the static ring (5), a movable ring seat (1) integrally rotating with a shaft (16) is arranged in the movable ring (3), the end part of the movable ring seat (1) is matched with the end face of the shaft sleeve (9), a pumping ring (14) integrally rotating with the shaft sleeve (9) is clamped at the other end of the shaft sleeve (9), a round hole (23) is formed in the pumping ring (14), the round hole (23) is communicated with a cooling oil channel (21) arranged on the cooling cover (7), and the cooling oil channel (21) is communicated with a cooling oil outlet oil nozzle (12) arranged on the cooling cover, a cooling oil inlet nozzle (10) is also arranged on the cooling cover (7), and a framework oil seal (15) is arranged at the position where the pumping ring (14) is arranged on the cooling cover (7).

2. The mechanical seal of a pre-press mounting structure of claim 1, wherein: the outer end face of spring holder (8) is equipped with prevents revolving stage (17), and the tip that prevents revolving stage (17) is equipped with spacing platform (18), press fitting ring (27) are gone up and are equipped with a plurality of pressure equipment grooves (19) that can pack into spacing platform (18) along the circumferencial direction equipartition, still the equipartition is equipped with a plurality of cooperation and packs into rotation preventing groove (20) of preventing revolving stage (17) on press fitting ring (27).

3. A pre-press structural mechanical seal as set forth in claim 2, wherein: the pumping ring (14) is uniformly provided with a plurality of round holes (23) along the circumferential direction, and both sides of the round holes (23) are provided with throttling grooves (22) along the circumferential direction of the pumping ring (14).

4. A pre-press structural mechanical seal as set forth in claim 3, wherein: one side end face, far away from the spring (11), of the spring seat (8) is provided with a spring seat boss (26), and the spring seat boss (26) is installed in a matched mode with a groove formed in the end face of the stationary ring (5).

5. A pre-press fit arrangement mechanical seal as claimed in claim 3 or 4, wherein: the movable ring seat (1) and the shaft (16) are in key transmission, and one side, close to the pumping ring (14), of the shaft sleeve (9) is fixedly connected with the shaft (16) through a pin (13).

6. A pre-press mounting structure mechanical seal according to any of claims 1 to 5, wherein: the movable ring seat is characterized in that the contact position of the movable ring seat (1) and the movable ring (3) is sealed through a movable ring O-shaped ring (2), the static ring (5) and the cooling cover (7) are sealed through a static ring O-shaped ring (6), and the movable ring seat (1) and the end part of the shaft sleeve (9) are matched and installed to be sealed through a sealing gasket (4).

7. The mechanical seal of a pre-press mounting structure as set forth in claim 6, wherein: and one side of the framework oil seal (15) is provided with an elastic check ring (25).

8. The mechanical seal of a pre-press mounting structure of claim 7, wherein: one end of the spring (11) is provided with a baffle ring (24), the baffle ring (24) is provided with an oil passage, and the baffle ring (24) and the inner side of the cooling cover (7) are of an integrated structure.

9. The mechanical seal of a pre-press mounting structure of claim 1, wherein: the cooling oil inlet oil nozzle (10) and the cooling oil outlet oil nozzle (12) are respectively provided with a plug.

10. The mechanical seal of a pre-press mounting structure of claim 1, wherein: the cooling cover (7) is made of stainless steel or glass fiber reinforced plastic, and the moving ring (3) and the static ring (5) are both made of silicon carbide.