CN212080155U

CN212080155U - Corrosion-resistant and dry-grinding-resistant mechanical sealing element

Info

Publication number: CN212080155U
Application number: CN202020586230.1U
Authority: CN
Inventors: 刘加权
Original assignee: Zhangjiagang Haidi Power Transmission Technology Co ltd
Current assignee: Zhangjiagang Haidi Power Transmission Technology Co ltd
Priority date: 2020-04-20
Filing date: 2020-04-20
Publication date: 2020-12-04
Anticipated expiration: 2030-04-20

Abstract

The utility model discloses a mechanical seal spare of corrosion-resistant anti dry grinding, include: the axle sleeve, the fixed throw-out collar that is provided with on the axle sleeve, be provided with the screw thread push rod on the throw-out collar, be provided with the staple bolt on the axle sleeve, staple bolt and screw thread push rod contact, be provided with first sealing washer in the staple bolt, first sealing washer pastes tightly with the axle sleeve, the cover is equipped with the tetrafluoro bellows on the axle sleeve, the bottom that the tetrafluoro bellows top leaned on the staple bolt, the cover is equipped with annular seat on the tetrafluoro bellows, leave the compensation clearance between annular seat and the staple bolt, be provided with the elastic component between annular seat and staple bolt, be connected with the rotating ring of non-pressure carborundum material in the bottom of tetrafluoro bellows, be provided with stationary ring seat on the axle sleeve that lies in the rotating ring below, leave the running gap between stationary ring seat and the axle sleeve, be provided with the stationary ring of alloy. The utility model has the advantages that: not only is high temperature resistant, wear resistant and corrosion resistant, but also has good mechanical sealing property.

Description

Corrosion-resistant and dry-grinding-resistant mechanical sealing element

Technical Field

The utility model relates to a mechanical seal spare of corrosion-resistant anti dry grinding.

Background

The mechanical sealing element is generally used as shaft end sealing of rotary mechanical equipment, and is composed of a pair or a plurality of pairs of rotating rings and static rings to form end face friction pairs which rotate relatively, and the gap of the friction pairs is small, so that dynamic sealing is realized. As a critical shaft end seal element, failure of the mechanical seal can result in severe economic loss and even loss of life and personal injury. The friction pair in the mechanical sealing element is easy to have faults of untight sealing and the like in the mutual contact friction process, and the untight sealing faults are not easy to find and remedy in time, so that great loss is caused.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a rational in infrastructure, and have the corrosion-resistant anti dry grinding's of stronger sealing performance mechanical seal spare.

In order to achieve the above object, the utility model adopts the following technical scheme: a corrosion resistant, dry-abrasion resistant mechanical seal, comprising: a shaft sleeve which can be tightly matched with the rotating shaft, a push ring is fixedly arranged on the shaft sleeve, a plurality of threaded push rods are arranged on the push ring, the lower ends of the threaded push rods extend downwards out of the push ring, a hoop is arranged on the shaft sleeve below the push ring, the top of the hoop is contacted with the threaded push rods, a first sealing ring is arranged in the hoop and is tightly attached to the shaft sleeve, a tetrafluoro bellows is sleeved on the shaft sleeve below the hoop, the top of the tetrafluoro bellows is abutted against the bottom of the hoop, an annular seat is sleeved on the tetrafluoro bellows, a compensation gap is left between the annular seat and the hoop, an elastic piece is arranged between the annular seat and the hoop, a movable ring which is made of non-pressure silicon carbide is connected to the bottom of the tetrafluoro bellows, a static ring seat is arranged on the shaft sleeve below the movable ring, a rotating gap is left between the static ring seat and the shaft sleeve, a static ring which is made of alloy, the static ring is matched with the dynamic ring, and a second tetrafluoro gasket is arranged at the bottom of the static ring seat.

Further, the corrosion-resistant and dry-grinding-resistant mechanical sealing element is characterized in that the elastic element is a compression spring, a plurality of spring holes are uniformly arranged on the annular seat at intervals along the circumference, one compression spring is placed in each spring hole, and the top end of each compression spring abuts against the bottom of the hoop.

Furthermore, in the corrosion-resistant and dry-grinding-resistant mechanical sealing element, the bottom periphery of the hoop extends downwards to form an outer retaining ring, the outer retaining ring is arranged on the outer side of the compression spring in a retaining manner, and a gap is reserved between the outer retaining ring and the annular seat.

Further, the section of the static ring is in a convex shape, a circular groove which is sunken downwards is formed in the static ring seat, a first polytetrafluoroethylene gasket is placed in the circular groove, the static ring is stacked on the first polytetrafluoroethylene gasket, a pressure ring is pressed on a step of the static ring, and the pressure ring is fixedly connected with the static ring seat through a bolt.

Further, the corrosion-resistant and dry-grinding-resistant mechanical sealing element is characterized in that a ring groove is formed in the bottom of the polytetrafluoroethylene corrugated pipe, a movable ring is clamped in the ring groove and extends out of the ring groove downwards, and the movable ring and the ring groove are in interference fit.

Further, the corrosion-resistant anti-dry-grinding mechanical sealing element comprises a push ring and a push ring, wherein the push ring is composed of three fan-shaped modules with the same size and structure, a first thread through hole is formed in each fan-shaped module, the thread push rod is in threaded connection with the corresponding first thread through hole, two ends of each fan-shaped module are respectively provided with an ear plate, a through hole is formed in each ear plate respectively, when the three fan-shaped modules are spliced together, the ear plates on the two adjacent fan-shaped modules are mutually attached and fixed through the aligned through holes by bolts.

Furthermore, the corrosion-resistant and dry-grinding-resistant mechanical sealing element comprises a plurality of sealing ring grooves which are arranged on the inner side wall of the shaft sleeve at intervals, a second sealing ring is arranged in each sealing ring groove, a second threaded through hole is formed in the side wall of the shaft sleeve above the sealing ring grooves, and a locking bolt is connected to the second threaded through hole in a threaded manner and can be connected with a rotating shaft penetrating through the shaft sleeve.

The utility model has the advantages that: thereby guarantee good leakproofness under tetrafluoro bellows and compression spring's dual elasticity to in the course of the work, compression spring can compensate the dynamic seal clearance that appears between rotating ring and the quiet ring automatically. The movable ring made of the pressureless silicon carbide material is matched with the static ring made of the alloy material, so that the mechanical sealing element is high-temperature resistant, wear resistant and corrosion resistant, and the mechanical performance of the mechanical sealing element is greatly improved.

Drawings

Fig. 1 is a schematic structural diagram of a corrosion-resistant and dry-abrasion-resistant mechanical sealing element according to the present invention.

Fig. 2 is a schematic top view of the push ring of fig. 1.

Detailed Description

The technical solution of the present invention will be further explained with reference to the accompanying drawings and preferred embodiments.

As shown in fig. 1 and fig. 2, the mechanical sealing element of the present invention is corrosion-resistant and dry-grinding resistant, and comprises: a shaft sleeve 1 which can be tightly matched with the rotating shaft, a push ring 2 is fixedly arranged on the shaft sleeve 1, a plurality of thread push rods 21 are arranged on the push ring 2, the lower ends of the thread push rods 21 extend downwards out of the push ring 2, the shaft sleeve 1 positioned below the push ring 2 is provided with an anchor ear 3, the top of the anchor ear 3 is contacted with the threaded push rod 21, a first sealing ring 31 is arranged in the hoop 3, the first sealing ring 31 is tightly attached to the shaft sleeve 1, a tetrafluoro corrugated pipe 4 is sleeved on the shaft sleeve 1 positioned below the hoop 3, the top of the tetrafluoro corrugated pipe 4 is propped against the bottom of the hoop 3, the PTFE corrugated pipe 4 is sleeved with an annular seat 5, a compensation gap is left between the annular seat 5 and the hoop 3, a plurality of spring holes 51 are uniformly arranged on the annular seat 5 at intervals along the circumference, a compression spring 52 is arranged in each spring hole 51 as an elastic piece, and the top end of the compression spring 52 abuts against the bottom of the hoop 3. The bottom of the tetrafluoro bellows 4 is provided with a ring groove, a movable ring 6 made of non-pressure silicon carbide is clamped in the ring groove and extends downwards out of the ring groove, and the movable ring 6 and the ring groove are in interference fit. Be provided with quiet ring seat 7 on the axle sleeve 1 that is located the rotating ring 6 below, quiet ring seat 7 and axle sleeve 1 between leave the running gap, be provided with the circular recess of undercut on quiet ring seat 7, placed first tetrafluoro gasket 71 in the circular recess, alloy material's quiet ring 8 is stacked on first tetrafluoro gasket 71, the section of quiet ring 8 is convex shape, and the top of quiet ring 8 is laminated with the bottom of rotating ring 6, and it has the clamping ring 72 to press on the step of quiet ring 8, and clamping ring 72 passes through bolt and quiet ring seat 7 fixed connection. A second tetrafluoro gasket 73 is provided at the bottom of the stationary ring base 7.

In this embodiment, the bottom periphery of the anchor ear 3 extends downward to form the outer retainer ring 32, the outer retainer ring 32 is retained outside the compression spring 52, a gap is left between the outer retainer ring 32 and the annular seat 5, when the threaded push rod 21 pushes the anchor ear 3 downward, the anchor ear 3 overcomes the elastic force of the compression spring 52 to move downward until the outer retainer ring 32 on the anchor ear 3 abuts against the annular seat 5, so that the compression spring 52 can be protected, and the compression spring 52 is prevented from being damaged by external corrosive dust or liquid. And in the working process, when a gap is formed between the outer retainer ring 32 and the annular seat 5, the gap is formed between the dynamic seal between the dynamic ring 6 and the static ring 8.

In this embodiment, the push ring 2 is composed of three fan-shaped modules 21 with the same size and structure, each fan-shaped module 21 is provided with a first threaded through hole 22, the threaded push rod 23 is in threaded connection with the corresponding first threaded through hole 22, two ends of each fan-shaped module 21 are respectively provided with an ear plate 24, each ear plate 24 is provided with a through hole, when the three fan-shaped modules 21 are spliced together, the ear plates 24 on two adjacent fan-shaped modules 21 are mutually jointed and fixed by bolts penetrating through the aligned through holes, so that the push ring 2 can be fixed on the shaft sleeve 1, and the push ring 2 with the structure is convenient to disassemble and assemble.

In this embodiment, two seal ring grooves are spaced apart from each other on the inner side wall of the shaft sleeve 1, a second seal ring 11 is disposed in each seal ring groove, a second threaded through hole is disposed on one side wall of the shaft sleeve 1 above the seal ring groove, a locking bolt 12 is threadedly connected to the second threaded through hole, and the locking bolt 12 can be connected to a rotating shaft disposed in the shaft sleeve 1.

The utility model discloses an installation and theory of operation as follows: the stationary ring seat 7 provided with the stationary ring 8 is fixed on rotary mechanical equipment, the second tetrafluoro gasket 73 at the bottom of the stationary ring seat 7 is attached to the equipment, the shaft sleeve 1 is arranged in the stationary ring seat 7 in a penetrating manner, the shaft sleeve 1 is provided with a rotating shaft in a penetrating manner, the second sealing ring 11 in the shaft sleeve 1 is tightly attached to the rotating shaft, and the rotating shaft and the shaft sleeve 1 are fixedly connected through a locking bolt 12. Then, the movable ring 6, the tetrafluoro bellows 4, the annular seat 5, the compression spring 52, the hoop 3 and the push ring 2 are sequentially installed along the shaft sleeve 1 from bottom to top. The threaded push rod 21 pushes the anchor ear 3 downwards, the anchor ear 3 pushes the tetrafluoro bellows 4 and the compression spring 52 downwards, the tetrafluoro bellows 4 enables the movable ring 6 to be attached to the static ring 8 after being subjected to downward thrust, dynamic sealing is formed between the movable ring 6 and the static ring 8, the annular seat 5 applies downward thrust to the tetrafluoro bellows 4 after being subjected to downward thrust of the compression spring 52, and a better dynamic sealing state is further formed between the movable ring 6 and the static ring 8. When a gap occurs between the dynamic seal between the dynamic ring 6 and the static ring 8, the compression spring 52 automatically presses the annular seat 5 downwards through elasticity, so that the dynamic seal gap between the dynamic ring 6 and the static ring 8 is compensated. When the elastic force generated by the deformation amount of the compression spring 52 cannot compensate for the gap, the anchor ear 3 is pushed downward by the threaded push rod 21, so that the compression spring 52 obtains a sufficient deformation amount.

Claims

1. A corrosion resistant, dry-abrasion resistant mechanical seal, comprising: can with pivot tight fit's axle sleeve, its characterized in that: a push ring is fixedly arranged on a shaft sleeve, a plurality of threaded push rods are arranged on the push ring, the lower ends of the threaded push rods extend downwards to the push ring, a hoop is arranged on the shaft sleeve below the push ring, the top of the hoop is contacted with the threaded push rods, a first sealing ring is arranged in the hoop and is tightly attached to the shaft sleeve, a tetrafluoro bellows is sleeved on the shaft sleeve below the hoop, the top of the tetrafluoro bellows is abutted against the bottom of the hoop, an annular seat is sleeved on the tetrafluoro bellows, a compensation gap is reserved between the annular seat and the hoop, an elastic part is arranged between the annular seat and the hoop, a movable ring made of non-pressure silicon carbide is connected to the bottom of the tetrafluoro bellows, a static ring seat is arranged on the shaft sleeve below the movable ring, a rotating gap is reserved between the static ring seat and the shaft sleeve, a static ring made of alloy material is arranged in the static ring seat and is matched with the movable ring, and a second tetrafluoro gasket is arranged at the bottom of the static ring seat.

2. A corrosion resistant, dry-wear resistant mechanical seal according to claim 1, wherein: the elastic piece is a compression spring, a plurality of spring holes are uniformly arranged on the annular seat at intervals along the circumference, a compression spring is placed in each spring hole, and the top end of each compression spring abuts against the bottom of the hoop.

3. A corrosion resistant, dry-abrasion resistant mechanical seal according to claim 2, wherein: the bottom periphery downwardly extending of staple bolt is formed with outer retaining ring, and outer retaining ring keeps off and establishes in compression spring's the outside, leaves the clearance between outer retaining ring and the annular seat.

4. A corrosion resistant, dry-abrasion resistant mechanical seal according to claim 1, 2 or 3, wherein: the section of quiet ring is convex shape, is provided with the circular recess of undercut on quiet ring seat, has placed first tetrafluoro gasket in the circular recess, and quiet ring stacks on first tetrafluoro gasket, and it has the clamping ring to press on the step of quiet ring, and the clamping ring passes through bolt and quiet ring seat fixed connection.

5. A corrosion resistant, dry-abrasion resistant mechanical seal according to claim 1, 2 or 3, wherein: the bottom of the PTFE corrugated pipe is provided with a ring groove, a movable ring is clamped in the ring groove and extends downwards out of the ring groove, and the movable ring is in interference fit with the ring groove.

6. A corrosion resistant, dry-abrasion resistant mechanical seal according to claim 1, 2 or 3, wherein: the push ring is composed of three fan-shaped modules with the same size and structure, a first thread through hole is formed in each fan-shaped module, the thread push rod is in threaded connection with the corresponding first thread through holes, lug plates are arranged at two ends of each fan-shaped module respectively, a through hole is formed in each lug plate respectively, when the three fan-shaped modules are assembled together, the lug plates on the two adjacent fan-shaped modules are mutually attached and fixed by bolts penetrating through the aligned through holes.

7. A corrosion resistant, dry-abrasion resistant mechanical seal according to claim 1, 2 or 3, wherein: the sealing structure comprises a shaft sleeve and is characterized in that a plurality of sealing ring grooves are formed in the inner side wall of the shaft sleeve at intervals, a second sealing ring is arranged in each sealing ring groove, a second threaded through hole is formed in the side wall of the shaft sleeve above the sealing ring groove, a locking bolt is connected in the second threaded through hole in a threaded mode and can be connected with a rotating shaft penetrating through the shaft sleeve.