CN102966739B - Bellows mechanical sealing device with self-circulation function - Google Patents

Bellows mechanical sealing device with self-circulation function Download PDF

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Publication number
CN102966739B
CN102966739B CN201210512559.3A CN201210512559A CN102966739B CN 102966739 B CN102966739 B CN 102966739B CN 201210512559 A CN201210512559 A CN 201210512559A CN 102966739 B CN102966739 B CN 102966739B
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ring
pump efficiency
sealing gland
bellows
axle sleeve
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CN201210512559.3A
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CN102966739A (en
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郭文德
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DONGGUAN CITY HUAHUI PRECISION MACHINERY Co Ltd
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DONGGUAN CITY HUAHUI PRECISION MACHINERY Co Ltd
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Abstract

The invention discloses a bellows mechanical sealing device with a self-circulation function, which comprises a shaft sleeve, a sealing gland, an elastic compensation component, a moving ring, an auxiliary sealing part and a pump ring. The elastic compensation component comprises a bellows, a static ring and an end cover; the static ring and the end cover are connected to both ends of the bellows in a sealing manner; the end cover is fixed on the sealing gland; the outer wall of the shaft sleeve is provided with a step; one side of the moving ring is abutted against the step; the pump ring is propped against the moving ring by a wave spring; a clamp spring is arranged on the shaft sleeve in a position outside the pump ring; the pump ring and the moving ring are clamped on the shaft sleeve by the clamp spring and the step; anti-rotating parts are respectively between the shaft sleeve and the moving ring and between the shaft sleeve and the pump ring; a ring-shaped clamping groove is formed in the shaft sleeve in a position outside the end cover; and a limiting plate is clamped in the clamping groove and is fixed on the sealing gland. The elastic compensation component is fixed with the sealing gland, the moving ring and the pump ring are clamped on the shaft sleeve by the step and the clamp spring and the sealing gland and the elastic compensation component are limited on the shaft sleeve by the limiting plate, so as to form a cartridge mechanical seal.

Description

A kind of mechanical seal device for rubber bellows with self-loopa
Technical field
The present invention relates to a kind of mechanical seal device of pump, particularly relate to a kind of mechanical seal device for rubber bellows with self-loopa.
Background technique
Single-stage cantilever centrifugal pump has in fluid pumping to be applied the most widely.For reducing pump housing boundary dimension, improving the reasons such as the kinematic accuracy of the flexural strength of pump shaft and raising pump shaft, the axial space objectively causing pump housing seal chamber is comparatively short and small, therefore difficulty is caused to the appropriate design type selecting of mechanical seal, particularly be difficult to be designed to integrated mechanical sealing, sealflush thermal force larger, seal face poor thermal conductivity, causes liquid film unstability to cause sealing surface dry friction, there is the trend of premature failure.In order to reduce the hot load of seal space; stablize liquid film and protection friction pair; needing, pump efficiency ring is set in some cases and carries out forced heat radiation; traditional pump efficiency ring offers square threaded form on outer wall; circulate to drive washing solution; in practical experience, the pump efficiency ring of this structure is when rotating speed is less than 1500Rpm, and its circulating effect is poor.
Summary of the invention
The object of this invention is to provide a kind of mechanical seal device for rubber bellows with self-loopa.
According to a kind of mechanical seal device for rubber bellows with self-loopa provided by the invention, comprise axle sleeve, sealing gland, elastic compensating assembly, rotating ring, secondary seal and pump efficiency ring, sealing gland is provided with and rinses outlet and rinse entrance, rinses the outer wall that exit position corresponds to pump efficiency ring; Elastic compensating assembly comprises the end cap of bellows, stationary ring and annular, and stationary ring and end cap are sealedly attached to the two ends of bellows respectively, and end cap is fixed on sealing gland; The outer wall of axle sleeve is provided with a step, and the side of rotating ring is connected to this step; Pump efficiency ring is connected to rotating ring by wavy spring, and the axle sleeve of pump efficiency ring outside is provided with a jump ring, and pump efficiency ring and rotating ring are clipped on axle sleeve by this jump ring and described step; Rotating ring and be respectively equipped with rotation preventing device between pump efficiency ring and axle sleeve; The axle sleeve of described end cap outside is provided with the draw-in groove of annular, and be arranged with limiting board in draw-in groove, limiting board is fixed on sealing gland; Secondary seal is equipped with between end cap and sealing gland, between rotating ring and axle sleeve, between axle sleeve and pump shaft and between sealing gland and the pump housing.
Its beneficial effect is: elastic compensating component integration and sealing gland are fixed, rotating ring and pump efficiency ring are folded in limiting board on axle sleeve by step and jump ring and are then defined on axle sleeve by sealing gland and elastic compensating assembly, composition integrated mechanical sealing.Compact structure, the axial dimension of this mechanical seal device are short, achieve the integrated mechanical sealing of short and small axial space, and the dismounting of mechanical seal device is easier, can before the loading pump housing, carry out debugging and detect, improve precision and the working life of mechanical seal; After adding pump efficiency ring, realize forced heat radiation, improve condensate film stability, and the working life of friction pair.In addition, elastic compensating assembly is that state type is installed, and only needs first order buckling when mounted, just automatically can regulate the decentraction of pump shaft and seal chamber, the followability of sealing surface is good, decreases beating of Sealing itself, make sealing surface face pressure, liquid film stable, thus extend sealing life.
A kind of optimal way, the sidewall of described pump efficiency ring has some axial eccentric grooves, eccentric groove, evenly and at intervals around pump efficiency ring circle distribution, the outer wall of pump efficiency ring also has some throttling grooves circumferentially, and the flushing outlet port of sealing gland inwall has a volute space.
Further, the width of described eccentric groove is 6mm, and the outer wall at pump efficiency ring eccentric groove place and the minimum clearance of sealing gland inwall are 1mm.
Further, described throttling groove is the square groove that width and the degree of depth are 1mm, and the outer wall at pump efficiency ring throttling groove place and the gap of sealing gland inwall are 0.5mm.
Further, the helical line starting point angle of the volute space of described sealing gland inwall is-90 °, terminal angle is 70 °, the distance that helical line destination county outwards offsets sealing gland internal diameter is 8mm, and the circular arc line of the sealing gland inwall at 70 ° to 90 ° places to be a diameter be 50mm, nest line destination county position is located in described flushing outlet, and the axle center rinsing outlet is positioned on the tangent line of pump efficiency ring external diameter.
The beneficial effect of above-mentioned optimal way is: the circulating effect of pump efficiency ring when low-speed running of band eccentric groove is better than the pump efficiency ring of square threaded form, in practice, the pump efficiency ring of eccentric groove is when rotating speed is greater than 500Rpm, and washing solution just can rely on centrifugal force to produce pressure head, tangentially enters and rinses outlet; And volute space can hold the washing solution of circulation, according to fluid mechanics principle, this volute space is conducive to washing solution and obtains kinetic energy, avoid the inefficient cycle of washing solution between sealing gland and pump efficiency ring outer wall, reduce the thermal force of heat of stirring and sealing, more overcome the problem that the circulation of conventional seals liquid is not smooth, improve cooling effectiveness; Throttling groove can prevent washing solution and medium from going here and there introducing amount of heat mutually, affects cooling effect.
A kind of optimal way, described elastic compensating assembly also comprises transition ring and stationary seat, and seal welding is in the two ends of bellows respectively for transition ring and stationary seat, and stationary ring is embedded on stationary seat, and transition ring is welded on end cap.Its beneficial effect is: it is overall that elastic compensating assembly forms a unit loading type, can modularized production, improves precision and efficiency of assembling.
A kind of optimal way, described rotation preventing device comprises ball, is located at the socket bore on axle sleeve and is located at the driving groove of the axis on rotating ring and pump efficiency ring respectively, ball is positioned at socket bore and the sandwiched space of driving groove, and driving groove is distributed in the inwall of rotating ring or pump efficiency ring circumferentially.Its beneficial effect is: ball is evenly arranged, and does not affect dynamic balancing, compares the driving component of screw class, and ball can not make transmission failure because vibration gets loose, and its transmission is more reliable.
A kind of optimal way, described bellows is welded metal bellow.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention is described further.
Fig. 1 is the cross-sectional view of the mechanical seal device for rubber bellows of the band self-loopa that the embodiment of the present invention provides.
Fig. 2 is the Disassembling Products schematic diagram of the mechanical seal device for rubber bellows of the band self-loopa that the embodiment of the present invention provides.
Fig. 3 is the generalized section of embodiment of the present invention Elastic compensation assembly partial structurtes.
Fig. 4 is the generalized section of pump efficiency ring structure in the embodiment of the present invention.
Fig. 5 is the structural representation of volute space in the embodiment of the present invention.
Embodiment
With reference to figure 1 and Fig. 2, a kind of mechanical seal device for rubber bellows with self-loopa, comprise axle sleeve 100, sealing gland 200, elastic compensating assembly 300, rotating ring 400, secondary seal and pump efficiency ring 500, sealing gland 200 is provided with and rinses outlet 210 and rinse entrance 220, rinses the outer wall that outlet 210 position corresponds to pump efficiency ring 500.
With reference to figure 3, elastic compensating assembly 300 comprises bellows 310, stationary ring 320, annular end cap 330, transition ring 340 and stationary seat 350, bellows 310 is welded metal bellow, transition ring 340 and stationary seat 350 difference seal welding are in the two ends of bellows 310, stationary ring 320 is embedded on stationary seat 350, and transition ring 340 is welded on end cap 330, end cap 330 is fixed on sealing gland 200 by eight uniform bolts 360, it is overall that elastic compensating assembly 300 forms a unit loading type, can modularized production, improve precision and efficiency of assembling.
The outer wall of axle sleeve 100 is provided with a step 110, and the side of rotating ring 400 is connected to this step 110; Pump efficiency ring 500 is connected to rotating ring 400 by wavy spring 410, concrete abutment is: the inwall of rotating ring 400 near one end of pump efficiency ring 500 has a heavy stand, secondary seal (the 2nd O shape circle 620) is arranged in this heavy stand, gasket ring 420 is provided with outside secondary seal, wavy spring 410 is connected to the opposite side of gasket ring 420, and is connected to this wavy spring 410 inside pump efficiency ring 500.The axle sleeve 100 of pump efficiency ring 500 outside is provided with a jump ring 120, and pump efficiency ring 500 and rotating ring 400 are clipped on axle sleeve 100 by this jump ring 120 and described step 110; Rotating ring 400 and be respectively equipped with rotation preventing device between pump efficiency ring 500 and axle sleeve 100, the preferred a kind of rotation preventing device of present embodiment comprises ball 130, is located at the socket bore (not shown) on axle sleeve 100 and is located at the driving groove (not shown) of the axis on rotating ring 400 and pump efficiency ring 500 respectively, ball 130 is positioned at socket bore and the sandwiched space of driving groove, and driving groove is distributed in the inwall of rotating ring 400 or pump efficiency ring 500 circumferentially; Ball 130 is evenly arranged, and does not affect dynamic balancing, compares the driving component of screw class, and ball 130 can not make transmission failure because vibration gets loose, and its transmission is more reliable.
The axle sleeve 100 of end cap 330 outside is provided with the draw-in groove 140 of annular, and be arranged with the limiting board 150 of two pieces of positional symmetry in draw-in groove 140, the other end of limiting board 150 is fixed on sealing gland 200 by bolt 151; Be provided with an O shape between end cap 330 and sealing gland 200 and enclose 610, be provided with the 2nd O shape between rotating ring 400 and axle sleeve 100 and enclose 620, between axle sleeve 100 and pump shaft, be provided with the first sealing gasket 630, between sealing gland 200 and the pump housing, be provided with the second sealing gasket 640.
Overall, the rotating ring 400 fixing with sealing gland 200 of elastic compensating assembly 300 and pump efficiency ring 500 are folded in limiting board 150 on axle sleeve 100 by step 110 and jump ring 120 and are then defined on axle sleeve 100 by sealing gland 200 and elastic compensating assembly 300, composition integrated mechanical sealing.Compact structure, the axial dimension of this mechanical seal device are short, achieve the integrated mechanical sealing of short and small axial space, and the dismounting of mechanical seal device is easier, can before the loading pump housing, carry out debugging and detect, improve precision and the working life of mechanical seal; After adding pump efficiency ring, realize forced heat radiation, improve condensate film stability, and the working life of friction pair.In addition, elastic compensating assembly is that state type is installed, and only needs first order buckling when mounted, just automatically can regulate the decentraction of pump shaft and seal chamber, the followability of sealing surface is good, decreases beating of Sealing itself, make sealing surface face pressure, liquid film stable, thus extend sealing life.
With reference to figure 4 and Fig. 5, the sidewall of pump efficiency ring 500 has some eccentric grooves 510, eccentric groove 510 is evenly and at intervals around pump efficiency ring 500 circle distribution, and the width of eccentric groove 510 is 6mm, and the outer wall at pump efficiency ring 500 eccentric groove 510 place and the minimum clearance of sealing gland 200 inwall are 1mm.The outer wall of pump efficiency ring 500 also has some throttling grooves 520 circumferentially, throttling groove 520 is the square groove that width and the degree of depth are 1mm, and the outer wall at pump efficiency ring 500 throttling groove 520 place and the gap of sealing gland 200 inwall are 0.5mm.The flushing of sealing gland 200 inwall exports 210 places and has a volute space, the helical line starting point angle of this volute space is-90 °, terminal angle is 70 °, the distance that helical line destination county outwards offsets sealing gland 200 internal diameter is 8mm, and the circular arc line of sealing gland 200 inwall at 70 ° to 90 ° places to be a diameter be 50mm, nest line destination county position is located in described flushing outlet 210, and the axle center rinsing outlet 210 is positioned on the tangent line of pump efficiency ring 500 external diameter.Above-mentioned data are only dimensional parameters during optimal effectiveness.
The circulating effect of pump efficiency ring 500 when low-speed running with eccentric groove 510 is better than the pump efficiency ring of square threaded form, in practice, the pump efficiency ring 500 of eccentric groove 510 is when rotating speed is greater than 500Rpm, and washing solution just can rely on centrifugal force to produce pressure head, tangentially enters and rinses outlet 210; And volute space can hold the washing solution of circulation, according to fluid mechanics principle, this volute space is conducive to washing solution and obtains kinetic energy, avoid the inefficient cycle of washing solution between sealing gland 200 and pump efficiency ring 500 outer wall, reduce the thermal force of heat of stirring and sealing, more overcome the problem that the circulation of conventional seals liquid is not smooth, improve cooling effectiveness; Throttling groove 520 can prevent washing solution and medium from going here and there introducing amount of heat mutually, affects cooling effect.
Certainly, above embodiment is merely illustrative and not limiting to the invention, the above is only preferred embodiment of the present invention, therefore all equivalences done according to the scheme described in patent claim of the present invention change or modify, and are included in patent claim of the present invention.

Claims (8)

1. the mechanical seal device for rubber bellows with self-loopa, comprise axle sleeve, sealing gland, elastic compensating assembly, rotating ring and secondary seal, elastic compensating assembly comprises the end cap of bellows, stationary ring and annular, stationary ring is sealedly attached to one end of bellows, end cap is fixed on sealing gland, be equipped with secondary seal between end cap and sealing gland, between rotating ring and axle sleeve, between axle sleeve and pump shaft and between sealing gland and the pump housing, it is characterized in that:
End bracket enclosed is connected to the other end of bellows,
Also comprise pump efficiency ring, sealing gland is provided with and rinses outlet and rinse entrance, rinses the outer wall that exit position corresponds to pump efficiency ring,
The outer wall of axle sleeve is provided with a step, and the side of rotating ring is connected to this step,
Pump efficiency ring is connected to rotating ring by wavy spring, and the axle sleeve of pump efficiency ring outside is provided with a jump ring, and pump efficiency ring and rotating ring are clipped on axle sleeve by this jump ring and described step,
Rotating ring and be respectively equipped with rotation preventing device between pump efficiency ring and axle sleeve,
The axle sleeve of described end cap outside is provided with the draw-in groove of annular, and be arranged with limiting board in draw-in groove, limiting board is fixed on sealing gland.
2. a kind of mechanical seal device for rubber bellows with self-loopa according to claim 1, is characterized in that:
The sidewall of described pump efficiency ring has some axial eccentric grooves, eccentric groove evenly and at intervals around pump efficiency ring circle distribution,
The outer wall of pump efficiency ring also has some throttling grooves circumferentially,
The flushing outlet port of sealing gland inwall has a volute space.
3. a kind of mechanical seal device for rubber bellows with self-loopa according to claim 2, is characterized in that: the width of described eccentric groove is 6mm, and the outer wall at pump efficiency ring eccentric groove place and the minimum clearance of sealing gland inwall are 1mm.
4. a kind of mechanical seal device for rubber bellows with self-loopa according to claim 2, is characterized in that: described throttling groove is the square groove that width and the degree of depth are 1mm, and the outer wall at pump efficiency ring throttling groove place and the gap of sealing gland inwall are 0.5mm.
5. a kind of mechanical seal device for rubber bellows with self-loopa according to claim 2, it is characterized in that: the helical line starting point angle of the volute space of described sealing gland inwall is-90 °, terminal angle is 70 °, the distance that helical line destination county outwards offsets sealing gland internal diameter is 8mm, and the circular arc line of the sealing gland inwall at 70 ° to 90 ° places to be a diameter be 50mm, nest line destination county position is located in described flushing outlet, and the axle center rinsing outlet is positioned on the tangent line of pump efficiency ring external diameter.
6. a kind of mechanical seal device for rubber bellows with self-loopa according to any one of claim 1 to 5, it is characterized in that: described elastic compensating assembly also comprises transition ring and stationary seat, transition ring and stationary seat difference seal welding are in the two ends of bellows, stationary ring is embedded on stationary seat, and transition ring is welded on end cap.
7. a kind of mechanical seal device for rubber bellows with self-loopa according to any one of claim 1 to 5, it is characterized in that: described rotation preventing device comprises ball, is located at the socket bore on axle sleeve and is located at the driving groove of the axis on rotating ring and pump efficiency ring respectively, ball is positioned at socket bore and the sandwiched space of driving groove, and driving groove is distributed in the inwall of rotating ring or pump efficiency ring circumferentially.
8. a kind of mechanical seal device for rubber bellows with self-loopa according to any one of claim 1 to 5, is characterized in that: described bellows is welded metal bellow.
CN201210512559.3A 2012-12-05 2012-12-05 Bellows mechanical sealing device with self-circulation function Active CN102966739B (en)

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CN103233909A (en) * 2013-04-12 2013-08-07 丹东克隆集团有限责任公司 Pumping ring for series connection type mechanical sealing device for pump
CN103759008B (en) * 2014-01-06 2016-02-17 东莞市华汇精密机械有限公司 A kind ofly pre-install the secondary mechanical seal arrangement of anti-injection and anti-injection method thereof
CN104179974B (en) * 2014-07-21 2016-07-06 浙江工业大学 Anti-axial vibration type mechanically-sealing apparatus
CN107120269B (en) * 2017-07-07 2018-06-26 中国石油大学(华东) A kind of double end-face mechanical sealing device with annular channel

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Denomination of invention: Bellows mechanical sealing device with self-circulation function

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