CN213145354U - Large-diameter combined type shaft sleeve mechanical sealing device - Google Patents

Abstract

The utility model relates to a major diameter combination formula axle sleeve mechanical seal device. The main problem of current major diameter axle head sealing device seal life-span short, the drunkenness volume of axle is big, dismantle inconvenient is solved. The method is characterized in that: the rotating shaft is connected with a shaft sleeve, an outer sleeve is sleeved outside the shaft sleeve, a movable ring is embedded in the left end of the outer sleeve), and the right end of the outer sleeve is connected with a positioning sleeve through a set screw A; the casing is connected with a sealing body, the sealing body is connected with a gland through a bolt, a static ring, a push ring and a spring are sequentially arranged inside the gland from left to right, and the left end of the static ring is in contact with a moving ring. The sealing device is corrosion-resistant, convenient to disassemble, reliable in sealing and long in service life.

Description

Large-diameter combined type shaft sleeve mechanical sealing device

Technical Field

The utility model relates to the field of machinary, a major diameter combination formula axle sleeve mechanical seal device specifically says so.

Background

At present, in the fields of oil field power plants, storage and transportation, gathering and transportation, chemical industry and the like, on shaft end sealing of a plurality of large-scale rotating equipment, mechanical sealing cannot be adopted due to the fact that the shaft end sealing size is large, the sealing space is limited and the shaft end sealing is influenced by a plurality of factors such as structure, weight, installation, disassembly and the like; the packing seal has short service life, frequent replacement, large shaft play amount and high labor intensity of operators, and can not meet the requirements of the current working conditions due to frequent damage under severe working conditions of high temperature, high pressure, low temperature, corrosive media and the like.

Disclosure of Invention

In order to overcome the short sealing life of the sealing device of the existing large-diameter shaft end, the large play amount of the shaft and the inconvenient insufficiency of the disassembly, the utility model provides a large-diameter combined type shaft sleeve mechanical sealing device, the sealing device is corrosion-resistant, convenient to disassemble, reliable in sealing and long in service life.

The technical scheme of the utility model is that: a large-diameter combined type shaft sleeve mechanical sealing device comprises a rotating shaft and a shell, wherein the rotating shaft is connected with a shaft sleeve, an outer sleeve is sleeved outside the shaft sleeve, a movable ring is embedded at the left end of the outer sleeve, and the right end of the outer sleeve is connected with a positioning sleeve through a set screw A; the casing is connected with a sealing body, the sealing body is connected with a gland through a bolt, a static ring, a push ring and a spring are sequentially arranged inside the gland from left to right, and the left end of the static ring is in contact with a moving ring.

The shaft sleeve is fixed on the rotating shaft through a set screw B, and the right end of the spring is arranged in the gland.

The left end of the gland is arranged in the sealing body, and a sealing ring is arranged between the gland and the sealing body.

The gland right-hand member is connected with the stopper, and the stopper is arranged in the recess of overcoat outer wall.

The utility model discloses following beneficial effect has: by adopting the scheme, the device adopts a combined shaft sleeve structure, has a compact structure, is convenient to assemble and disassemble, effectively reduces the number of sealed cavities, effectively reduces the size of a sealing pair, is convenient to process and manufacture and realizes reliable sealing; meanwhile, the sealing ring has good floatability and random compensation, can compensate leakage caused by abrasion, axial play, vibration and the like of the sealing ring, is particularly suitable for occasions of high-temperature, high-pressure, low-temperature media, corrosive media and the like, and has reliable sealing and long service life.

Drawings

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

In the figure, 1-a shaft sleeve, 2-an outer sleeve, 3-a sealing body, 4-a movable ring, 5-a stationary ring, 6-a gland, 7-a push ring, 8-a bolt, 9-a spring, 10-a positioning sleeve, 11-a set screw A, 12-a set screw B, 13-a limiting block, 14-a shell and 15-a rotating shaft.

Detailed Description

The present invention will be further explained with reference to the accompanying drawings:

as shown in fig. 1, the large-diameter combined type shaft sleeve mechanical sealing device comprises a rotating shaft 13 and a shell 14, wherein a shaft sleeve 1 is connected to the rotating shaft 14, and the shaft sleeve 1 is connected to the outer wall of the rotating shaft 14 through a set screw B12. The outer part of the shaft sleeve 1 is sleeved with an outer sleeve 2, and a sealing ring is arranged between the outer sleeve 2 and the shaft sleeve 1 to keep the sealing between the outer sleeve 2 and the shaft sleeve 1. The movable ring 4 is embedded in the left end of the outer sleeve 2, and the right end of the outer sleeve is connected with the positioning sleeve 10 through a set screw A11. 14 end connection of casing has seal 3, and 3 tip of seal are connected with gland 6 through bolt 8, 6 left ends of gland are placed inside seal 3, and are equipped with the sealing washer between gland 6 and the seal 3 to guarantee to seal between the two. Inside static ring 5, push ring 7, the spring 9 of being equipped with in proper order from left to right of gland 6, wherein the spring 9 right-hand member is located inside gland 6, and 5 left ends of static ring and rotating ring 4 contacts. 6 right-hand members of gland are connected with stopper 13, and stopper 13 arranges the recess of 2 outer walls of overcoat in to carry on spacingly to gland 6.

The shaft sleeve 1, the outer sleeve 2, the movable ring 4 and the positioning sleeve 10 jointly form a movable ring assembly which is a rotating part and can rotate along with the rotating shaft. The static ring 5, the gland 6, the push ring 7 and the spring 9 jointly form a static ring component which is a static part. The movable ring assembly and the static ring assembly jointly form a sealing assembly. When the device is installed on site, the shaft sleeve 1 is sleeved on a rotating shaft 15 to be sealed, after the axial position is adjusted, screw holes distributed in the circumferential direction of the shaft sleeve 1 are screwed on the rotating shaft 15 through the set screws 12, and whether the shaft sleeve is tightly combined with the shaft is checked by using a manual turning shaft. And then respectively sleeving the movable ring assembly and the static ring assembly on the installed shaft sleeve 1 in a sealing manner, moving the sealing assembly in the axial direction to enable the outer end face of the sealing body 3 to be close to the end face of the shell 14, simultaneously rotating the sealing assembly to enable bolt holes distributed on the sealing body 3 to be aligned with screw holes of the shell 14, and symmetrically tightening the connecting bolts so as to enable the static ring assembly to be fixedly connected with the shell 14. Then the screw holes distributed radially on the positioning sleeve 10 are fastened on the shaft sleeve 1 through a set screw A11, and the movable ring assembly is fixed on the rotating shaft by the combined shaft sleeve and can rotate along with the shaft. When the rotating shaft 15 works, the movable ring assembly is driven to rotate together, the static ring 5 in the static ring assembly is in a floating state and can axially extend and retract under the action of the push ring 7 and the spring 9, the size change of abrasion between sealing surfaces is compensated, and the sealing surface of the static ring 5 is always tightly attached to the sealing surface of the movable ring 4, so that the sealing reliability is ensured.

This mechanical seal device adopts cover combination formula axle sleeve structure in the cover, has reduced seal chamber size, has solved single big axle sleeve weight and is heavy, and the processing degree of difficulty is big, the difficult problem of being not convenient for install and remove. On the seal body, the reasonable design of the seal cavity effectively reduces the seal space, reduces the size of the main seal part, and is convenient for processing and manufacturing the seal pair and realizes reliable seal. In order to realize reliable sealing in an effective and limited space, a movable ring is embedded on the shaft sleeve 1 and has the function of a movable ring seat; the gland 6 and the sealing body 3 are connected through bolts to form a reliable sealing cavity, and meanwhile, a floating and compensating mechanism consisting of a push ring 7 and a spring 9 is also arranged on the gland 6, so that the sealing mechanism is compact, and the problem that mechanical sealing in a limited space is difficult to realize is solved. The seal cavity body adopts a labyrinth structure and adopts a multi-seal structure, the compensation and floating mechanism is positioned in a static and closed cavity, the spring is not contacted with a medium, the spring compensation mechanism can not be blocked by impurities in the medium containing the impurities, the compensation mechanism can be ensured to be tightly attached to a main seal surface all the time, and the anti-blocking and anti-impurity capability is realized. The floating compensation mechanism adopts a static structure, so that the vibration and influence generated by the self-unbalance weight of the large-diameter mechanical seal on the rotation of the shaft are reduced. By adopting a cartridge type structure, all parts are assembled together in a factory, only one shaft sleeve needs to be arranged on a shaft to be sealed and fastened, then the rest part is integrally sleeved on the arranged shaft sleeve, the sealing body 3 is connected with the equipment shell 14, and a fastening screw A11 on the positioning sleeve 10 is fastened on the shaft sleeve 1. The installation is simple, the field operation is convenient, and the assembly precision and quality are ensured.

Claims (4)

1. The utility model provides a major diameter combination formula axle sleeve mechanical seal device, includes rotation axis (15), casing (14), its characterized in that: the rotating shaft (15) is connected with a shaft sleeve (1), an outer sleeve (2) is sleeved outside the shaft sleeve (1), a movable ring (4) is embedded at the left end of the outer sleeve (2), and the right end of the outer sleeve is connected with a positioning sleeve (10) through a set screw A (11); the improved sealing device is characterized in that a sealing body (3) is connected onto the shell (14), a gland (6) is connected onto the sealing body (3) through a bolt (8), a static ring (5), a push ring (7) and a spring (9) are sequentially arranged inside the gland (6) from left to right, and the left end of the static ring (5) is in contact with the moving ring (4).

2. The large-diameter combined type shaft sleeve mechanical sealing device according to claim 1, wherein: the shaft sleeve (1) is fixed on the rotating shaft (15) through a set screw B (12), and the right end of the spring (9) is arranged in the gland (6).

3. The large-diameter combined type shaft sleeve mechanical sealing device according to claim 2, wherein: the left end of the gland (6) is arranged in the sealing body (3), and a sealing ring is arranged between the gland (6) and the sealing body (3).

4. The large-diameter combined type shaft sleeve mechanical sealing device according to claim 3, wherein: the right end of the gland (6) is connected with a limiting block (13), and the limiting block (13) is arranged in the groove in the outer wall of the outer sleeve (2).

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