CN201810780U

CN201810780U - Improved structure of mechanical shaft seal

Info

Publication number: CN201810780U
Application number: CN201020572211XU
Authority: CN
Inventors: 刘丁贵; 董兆华
Original assignee: Sunny King Machinery Co Ltd
Current assignee: Sunny King Machinery Co Ltd
Priority date: 2010-10-22
Filing date: 2010-10-22
Publication date: 2011-04-27
Anticipated expiration: 2020-10-22

Abstract

The utility model provides an improved structure of a mechanical shaft seal. In the utility model, a driving ring is internally provided with a step plane so as to form different inner diameters of a pipe, wherein, the greater pipe diameter is more than the smaller pipe diameter; a slewing ring with certain length is inserted into the position with the greater pipe diameter in the driving ring; and the step plane is equipped with a plurality of springs which prop against one end of the slewing ring. The length and sectional area of the slewing ring are increased without changing the structural length and diameter of the overall mechanical shaft seal so that the slewing ring is not easily damaged due to an external force applied by the driving ring and the like, and the durability of the mechanical shaft seal is strengthened, thus solving the problem of insufficient sectional strength of the mechanical shaft seal in the prior art.

Description

The structure-improved of mechanical shaft seal

Technical field

The utility model is about a kind of mechanical shaft seal, and its live axle and pivoted loop be interlock and make pivoted loop have an extrapolability to impose on the retaining ring of shaft seal cover mutually, is one can make the structure of the non-design space of the unlikely inflow of internal liquid of machinery.

Background technique

The employed mechanical shaft seal of prior art, the Seal cage that can be used in machinery (for example: pumping), and but restricted internal liquid only can rest in the space designed in the pumping and flow, and causes damage or other unpredictable injury of Pumping mechanism to place, non-design space to avoid flow of liquid.

See also Fig. 5, this is the mechanical shaft seal structure of prior art, it is equipped with a live axle 91 in shaft seal cover 90, on live axle 91 and the position that is away from shaft seal cover 90 relatively be arranged with one and drive ring 92, this end face that drives ring 92 1 ends has an opening, the other end is fixed on the live axle 91 with fixed block 921, it can be rotated simultaneously with live axle 91, on the other end that drives ring 92, be provided with single-revolution ring 93, pivoted loop 93 is sheathed on the live axle 91 and is positioned at the opening that drives ring 92 1 ends, pivoted loop 93 and 92 engagements of drive ring, make pivoted loop 93 encircle 92 interlocks with drive, the opposing end surface of set retaining ring 94 can be in contact with one another on one end face of pivoted loop 93 and the shaft seal cover 90, the other end of pivoted loop 93 and 92 on drive ring are provided with a spring 95 and a packing ring 96, spring 95 is a helical spring, the one end pushes against the interior ring side that drives ring 92, the other end pushes against a side of packing ring 96, the opposite side of packing ring 96 is bestowed an axial power to pivoted loop 93, by this axial power to retaining ring 94 direction ejection pivoted loops 93, has certain pressure when making the mutual frictional rotation of 94 of pivoted loop 93 and retaining rings, but and the flowing space of the end face limit interval liquid that touches by the two-phase mutual connection, make liquid be difficult for flowing in the unrestricted space.

When the mechanical shaft seal practice of prior art is installed in the pumping unit, this mechanical shaft seal is arranged on the interior live axle of pumping unit and between bearing support and pumping casing, because pumping unit inside is in order to install the space size of mechanical shaft seal, its certain restriction is arranged in design, just under the restriction of total length between drive ring 92 and the retaining ring 94 and entire outer diameter thereof, in order helical spring 95 to be set on the live axle 91 and to drive between ring 92 and the pivoted loop 93, and provide the elastic force of scalable displacement for it, make the design of spring 95 must have certain total length, so under the design, to cause the length and the cross-sectional area thereof of pivoted loop 93 must be shortened the setting that spring 95 just can be provided, and pivoted loop 93 is forming the setting of groove for seal ring 97 with respect to packing ring 96 1 sides, therefore will make the disconnected degree strength deficiency of pivoted loop 93 at last, and cause because of being subjected to driving the effect that encircles external force such as 92 destroyed easily.

The model utility content

Main purpose of the present utility model is to provide a kind of mechanical shaft seal of improved type, with this under the prerequisite that does not change whole mechanical shaft seal structure length and external diameter, can improve the bulk strength of pivoted loop, encircle to drive the rubbing action between pivoted loop and retaining ring because of drive shaft drives with the mechanical shaft seal that solves prior art, cause making under the external force effect pivoted loop easily to produce the situation of breaking and damaging.

For reaching aforementioned purpose, the utility model provides a kind of structure-improved of mechanical shaft seal, described mechanical shaft seal be sheathed on the live axle and be arranged at shaft seal cover and live axle between, it comprises:

One drives ring, it is that a hollow tube is sheathed on the live axle, and be fixed in live axle with fixed block, its body inboard has ladder surface, make the inner different inner diameters that forms of its body, on ladder surface, be provided with a plurality of spring grooves that are positioned at axial position, and described drive ring and live axle surface of contact establish an annular recess, establish a plurality of keyways on the described drive ring surface;

The single-revolution ring, it is a hollow tube and is sheathed on the live axle that the body outside has a ladder surface to form different body external diameters, its less caliber forms a mounting groove, and is equipped with a plurality of driving blocks on the body, is assemblied in the keyway that drives ring;

A plurality of springs, it is arranged in the spring groove that drives ring;

One barrier assembly, it comprises a catch and a spacer ring, and described catch is located between spring and the pivoted loop and is sheathed on the live axle, and described spacer ring is sheathed on the mounting groove of pivoted loop;

Two seal rings, it is the flexible seal of tool, one is sheathed in the annular recess that drives ring, on the another set of mounting groove of being located at pivoted loop with the spacer ring connecting part;

One retaining ring, it is a hollow tube, and it is fixedly arranged on shaft seal cover and is sheathed on the live axle, and the other end of its contiguous pivoted loop is resisted against on the opposing end surface of pivoted loop.

The structure-improved of above-mentioned mechanical shaft seal wherein is arranged with a plurality of keyways on an end surfaces of pivoted loop, establish a plurality of driving blocks with respect to the keyway place is prominent on the drive ring, and described driving block and keyway mutually combine.

The structure-improved of aforesaid mechanical shaft seal, wherein on the mounting groove of pivoted loop and the position that is positioned at ladder surface be provided with a spacer ring.

The structure-improved of described mechanical shaft seal, the ladder surface equal intervals of wherein said drive ring be provided with a plurality of spring grooves, the described spring that is arranged in the spring groove is resisted against an end face of catch, is resisted against pivoted loop through the other end of catch.

In addition, described spring is resisted against an end face of catch, is resisted against pivoted loop through the other end of catch, and this moment, spring was bestowed the axial force of pivoted loop one to the retaining ring direction, made and maintained certain friction of replacing between described pivoted loop and retaining ring when rotated.

When machinery starts, the live axle of its rotation drives ring and rotates simultaneously, this moment, pivoted loop was because of also rotating simultaneously with the cause that drives the ring engagement on the driving block pivoted loop, this moment pivoted loop bear and retaining ring between friction and drive the power that pivoted loop is given in circulating application, make the structural strength of pivoted loop enjoy test, the utility model changes the position of seal ring and spring, can be under structure length that does not change whole mechanical shaft seal and external diameter, structure and cross-sectional area lengthening with pivoted loop, its structural strength is increased, make pivoted loop be difficult for damaging because of driving externally applied forces such as ring, and seal ring changes to aforesaid position and makes this mechanical shaft seal except having good leak preventing effect, also can not produce the situation of abrasion, so the structure-improved of the utility model mechanical shaft seal has better serviceability and life-span than existing mechanical axle envelope to live axle.

Description of drawings

Fig. 1 is a generalized section of the present utility model.

Fig. 2 is a three-dimensional exploded view of the present utility model.

Fig. 3 is a combination section of the present utility model.

Fig. 4 is the generalized section of another preferred embodiment of the present utility model.

Fig. 5 is the generalized section of the mechanical shaft seal of prior art.

Embodiment

See also shown in Fig. 1 to 3, the structure-improved of the mechanical shaft seal that the utility model is designed, its be sheathed on the live axle 80 and be arranged on shaft seal cover 70 and live axle 80 between, comprised one and driven ring 10, single-revolution ring 20, a plurality of spring 30, and isolate external member 40, two seal rings 50 and a retaining ring 60.

Drive ring 10, be that a hollow tube is sheathed on the live axle 80, its inboard has a ladder surface, make the inner different inner diameters that forms of its body, an end bigger at internal diameter of tube body forms an opening, the axial length that wherein has big internal diameter of tube body is greater than the axial length with less internal diameter of tube body, less and be provided with the fixed hole 16 that is positioned at radial direction at a end at internal diameter of tube body away from shaft seal cover 70, run through the fixed hole 16 that drives ring 10 with a fixed block 11, to drive ring 10 is fixed on the live axle 80, fixed hole 16 rears are provided with a ring shaped slot 12 at the wall at the less internal diameter of tube body place that drives ring 10, the ladder surface place that drives on the ring 10 is provided with the spring groove 13 of a plurality of positions at axial position, specific embodiment shown in the figure is to be provided with six axial sleeve grooves 13, each spring groove 13 is evenly distributed on this ladder surface with the interval of 60 degree, drive ring 10 and be arranged with two keyways 14 in the left and right sides that is provided with opening one end, and the outstanding prominent body 15 that is provided with a ring-type of the interior sidewall surface of and big body inner radius other at ladder surface;

Pivoted loop 20, it is that a hollow tube can be sheathed on the live axle 80, its position is positioned at and drives the opening that ring 10 has big internal diameter of tube body, be the axial length of the axial length of pivoted loop 20 greater than one section of the less internal diameter of tube body that drives ring 10, its outside forms a ladder surface to form different body external diameters, at a contiguous end that drives ring 10 is the less body of external diameter, form the mounting groove 21 of a ring-type, two ends, pivoted loop 20 left and right sides are at the driving block 22 of being equipped with arcuation with respect to the position of the keyway 14 that drives ring 10;

Spring 30 is a pressure spring, and it is arranged in the spring groove 13 that drives ring 10.

Isolate external member 40 and comprise a catch 41 and a spacer ring 42, it is the ring-type lamellar body of two hollows, and wherein catch 41 is set on the live axle 80.

Two seal rings 50 are the flexible seal of tool.

Retaining ring 60 is that a hollow tube one end is fixedly arranged on the shaft seal cover 70 and is sheathed on that its other end that is adjacent to pivoted loop 20 is resisted against on the opposing end surface of pivoted loop 20 on the live axle 80.

The design of above-mentioned mechanical shaft seal, pivoted loop 20 wears and is positioned at the opening that drives ring 10 1 ends, one seal ring 50 is sheathed on the mounting groove 21 of pivoted loop 20 with spacer ring 42, one end of spacer ring 42 is resisted against the prominent body 15 that drives ring 10, the other end is resisted against seal ring 50, drive ring 10 combines with driving block 22 and keyway 14 with pivoted loop 20 drive ring 10 can be rotated simultaneously with pivoted loop 20, device one seal ring 50 and being set on the live axle 80 in ring shaped slot 12, make to drive between ring 10 and the live axle 80 and reach sealing, the mode that runs through the fixed hole 16 that drives ring 10 with fixed block 11 will drive and encircle 10 and be fixed on the live axle 80 again, it can be rotated simultaneously, because an end of each set spring 30 is resisted against the inwall of spring groove 13, the other end be resisted against on the live axle 80 sheathed catch 41, and the opposite side of catch 41 is resisted against the end place that pivoted loop 20 is provided with mounting groove 21.

When live axle 80 rotates, driving ring 10 can rotate simultaneously with live axle 80, drive pivoted loop 20 interlocks and drive ring 10 with engagement system, this moment, spring 30 was bestowed an axial force to pivoted loop 20, make pivoted loop 20 and retaining ring 60 keep one suitable to replace friction, make this mechanical shaft seal except having good leak preventing effect because two seal rings 50 are set in mounting groove 21 places that reach pivoted loop 20 on the live axle 80 respectively again, and can not produce the situation of abrasion live axle 80.

See also shown in Figure 4, structure improved another preferred embodiment for the utility model mechanical shaft seal, its pivoted loop 20A and the driving engagement that drives between ring 10A are arranged with a plurality of keyway 22A for the end surfaces at the contiguous retaining ring 60 of pivoted loop 20A, establish a plurality of driving block 14A to drive ring 10A with respect to keyway 22A place again, driving block 14A and keyway 22A work in coordination pivoted loop 20A and drive ring 10A can be rotated when live axle 80 rotates simultaneously, in the mounting groove 21A of pivoted loop 20A, the end that its keyway 22A cooperates with driving block 14A is established a spacer ring 42A in addition in addition.

Claims

1. the structure-improved of a mechanical shaft seal, described mechanical shaft seal be sheathed on the live axle and be arranged at shaft seal cover and live axle between, it is characterized in that, comprise:

One drives ring, it is that a hollow tube is sheathed on the live axle, and be fixed in live axle with fixed block, its body inboard has ladder surface, make the inner different inner diameters that forms of its body, and be provided with a plurality of spring grooves that are positioned at axial position on ladder surface, the surface of contact of described drive ring and live axle is established an annular recess, establishes a plurality of keyways on the described drive ring surface;

A plurality of springs, it is arranged in the spring groove that drives ring;

2. the structure-improved of mechanical shaft seal as claimed in claim 1 is characterized in that: be arranged with a plurality of keyways on an end surfaces of described pivoted loop, establish a plurality of driving blocks with respect to the keyway place is prominent driving on the ring, described driving block and keyway mutually combine.

3. the structure-improved of mechanical shaft seal as claimed in claim 2 is characterized in that: on the mounting groove of described pivoted loop and the position that is positioned at ladder surface be provided with a spacer ring.

4. the structure-improved of mechanical shaft seal as claimed in claim 3, it is characterized in that: the ladder surface equal intervals of described drive ring be provided with a plurality of spring grooves, the described spring that is arranged in the spring groove is resisted against an end face of catch, is resisted against pivoted loop through the other end of catch.