CN203770644U - Preinstalled secondary mechanical sealing device with jetting prevention function - Google Patents
Preinstalled secondary mechanical sealing device with jetting prevention function Download PDFInfo
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- CN203770644U CN203770644U CN201420004500.8U CN201420004500U CN203770644U CN 203770644 U CN203770644 U CN 203770644U CN 201420004500 U CN201420004500 U CN 201420004500U CN 203770644 U CN203770644 U CN 203770644U
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Abstract
The utility model discloses a preinstalled secondary mechanical sealing device with a jetting prevention function. The device is characterized by comprising an outer press cover, an inner press cover, a shaft sleeve, a primary sealing assembly and a secondary sealing assembly, wherein a shaft sleeve is sheathed on the rotary shaft, the inner press cover is sheathed at the medium end of the shaft sleeve, a primary sealing cavity is formed between the inner wall of the inner press cover and the outer wall of the shaft sleeve, the primary sealing assembly is arranged in the primary sealing cavity, the outer press cover is sheathed at the atmosphere end of the shaft sleeve, a secondary sealing cavity is formed between the inner wall of the outer press cover and the outer wall of the shaft sleeve, a secondary sealing assembly is preinstalled in the secondary sealing cavity, the secondary sealing assembly comprises a preinstalled secondary movable ring assembly and a secondary static ring assembly which are separated, a steel wire retaining ring is arranged between the secondary movable ring assembly and the shaft sleeve, the outer side of the outer end surface of the secondary movable ring assembly is provided with a clamping spring, and the outer side of the steel wire retaining ring is provided with an annular groove. The device has the advantages that the sealing structure is compact, the secondary sealing assembly does not consume the pump power under the condition of normal use, the design controllability is high, and the safety and reliability are realized.
Description
Technical field
The utility model relates to mechanical seal device, refers in particular to a kind of secondary mechanical seal device of pre-installing anti-injection.
Background technique
Mechanical seal is the important constituent elements of equipment such as centrifugal pump, rotary pump and stirrer, and sealing effect directly affects normal operation and the safety of equipment.Conventional machinery seal form mainly contains single end face and Double End, according to different working conditions, select different seal form and system, the common atmospheric side of mechanical single seal has restrictor ring, Double End form is furnished with the sealing system of complex and expensive, for mechanical single seal, Double End has better sealing effect, and its sealing is comparatively stable.
But in actual production, a kind of situation there will be is that mechanical seal is because of a variety of causes appearance sealing catastrophic failure, medium produces while spraying, for mechanical single seal because only have a seal face, therefore seal failure is this mechanical seal inefficacy, medium directly leaks into atmosphere, for double seals, comprise side medium sealing and atmospheric side sealing, when side medium sealing catastrophic failure, atmospheric side sealing should be born seal action in theory, but in practice, during due to side medium primary seal catastrophic failure, former sealing system also lost efficacy simultaneously, owing to lacking rinse-system, how long atmospheric side security seal is not adhered to yet and is damaged and lost efficacy.In existing seal form, the measure means of automatically tackling above-mentioned jet phenomenon are very limited, to personal safety, environment, normal production, all can produce harm, so it is particularly important to develop a kind of mechanical encapsulation devices of tackling sudden injection class seal failure.
Model utility content
The technical problems to be solved in the utility model is for above-mentioned the deficiencies in the prior art, provide that a kind of sealing configuration is compact, secondary seal assembly does not contact while normally using, do not consume pump power, design controllability is strong, the secondary mechanical seal device of the safe and reliable anti-injection of prepackage.
The technological scheme that the utility model is taked is as follows, and a kind of secondary mechanical seal device of pre-installing anti-injection, is characterized in that: comprise outer press cover, internal gland, axle sleeve, primary seal assembly and secondary seal assembly, wherein: described axle sleeve is set in rotating shaft; Described internal gland is set in the media end of axle sleeve, between the inwall of internal gland and the outer wall of axle sleeve, forms primary seal chamber, and primary seal assembly is arranged in above-mentioned primary seal chamber; Described outer press cover is set in the atmosphere end of axle sleeve, between the inwall of outer press cover and axle sleeve outer wall, forms secondary seal chamber, and secondary seal assembly is contained in above-mentioned secondary seal chamber in advance; Above-mentioned secondary seal assembly comprises secondary moving ring assembly and the secondary static components of separated prepackage, and both do not form seal face, and axial clearance is t3, between secondary moving ring assembly and axle sleeve, is provided with Steel Cable Baffle Ring; The outside of the exterior edge face of above-mentioned secondary moving ring assembly is provided with jump ring, and the exterior edge face of secondary moving ring assembly and the distance between jump ring are t2, and the outside of above-mentioned Steel Cable Baffle Ring is provided with circular groove; Distance between the center of circle of Steel Cable Baffle Ring and the center of circle of circular groove is t2; Primary seal component failures, medium injection outwards promotes secondary moving ring assembly the distance of t2, and Steel Cable Baffle Ring embeds in circular groove, and it is spacing that the exterior edge face of secondary moving ring assembly is adjacent to jump ring, secondary moving ring assembly and secondary static components are adjacent to, and form secondary seal end face.
Preferably, described primary seal assembly comprises one-level moving ring assembly and one-level stationary ring, wherein: above-mentioned one-level moving ring assembly comprises again one-level rotating ring, one-level rotating seat and one-level spring; Above-mentioned one-level rotating seat is fixed on axle sleeve by the first screw; Above-mentioned one-level rotating ring outer ring is provided with groove, and this groove coordinates with the fixture block of one-level rotating seat inner ring, and one-level rotating ring is connected with one-level rotating seat, and the exterior edge face of one-level rotating ring is narrow end surface, and the interior edge face of this narrow end surface and one-level stationary ring is adjacent to, and forms primary seal end face; Above-mentioned one-level stationary ring is fixed on the inner side end of internal diameter bulge loop of internal gland.
Preferably, between the inner ring of described rotating seat and axle sleeve outer ring, be provided with auxiliary sleeve; The exterior edge face of rotating seat is provided with at least two axial through holes, at least two one-level springs are arranged in this axial hole, the outer end linking springs seat of one-level spring, the inner of above-mentioned rotating ring is connected on spring seat, and above-mentioned one-level spring provides stretch compensation for rotating ring.
Preferably, described secondary moving ring assembly comprises secondary rotating ring and secondary rotating seat, secondary rotating seat is connected on axle sleeve by flat key, the exterior edge face of secondary rotating seat has annular groove, secondary rotating ring is arranged in above-mentioned annular groove, spacing by stop pin, by the axial screens of baffle ring, the groove end face of secondary rotating seat is stretched out in the exterior edge face of secondary rotating ring.
Preferably, the internal-and external diameter of described secondary rotating seat interior edge face has groove, forms the step anchor ring of middle part projection, and the external diameter groove on secondary rotating seat interior edge face is embedded with orifice sleeve, in internal diameter groove, is provided with Steel Cable Baffle Ring; Above-mentioned orifice sleeve is fixed on by the second screw on the interior edge face of secondary rotating seat, and the inner of orifice sleeve is stretched in the outer groove surface of internal gland internal diameter bulge loop; In above-mentioned outer groove surface, be provided with wear ring, the outer ring of orifice sleeve does not contact with the inner ring of wear ring, and monolateral gap is between the two δ, forms circumferential weld gap structure, and the scope of above-mentioned monolateral gap delta is 0.2-0.35mm.
Preferably, described secondary static components comprises secondary stationary ring, stationary seat and two-level spring; Above-mentioned stationary seat is connected to by the 3rd screw on the inner ring step surface of outer press cover, is provided with the 4th seal ring between stationary seat and the inner ring of outer press cover, forms slipper seal; Above-mentioned secondary stationary ring is arranged in the scrobicular ring of stationary seat interior edge face, and the interior edge face of secondary stationary ring is narrow end surface, and the exterior edge face distance of this narrow end surface and secondary rotating ring is t3, and the scope of above-mentioned t3 is 0.5-0.8mm.
Preferably, have at least two axial spring eyes on the inner ring step surface of described outer press cover, above-mentioned at least two two-level springs are arranged in this spring eye, and the inner of two-level spring is connected on stationary seat, for stationary seat provides elastic compensating; Above-mentioned two-level spring prepackage compression distance is t1.
Preferably, be respectively equipped with the first flushing hole and the second flushing hole on described outer press cover and internal gland, the first flushing hole second and flushing hole are communicated with respectively secondary seal chamber and primary seal chamber; On above-mentioned outer press cover, be also provided with liquid port.
Preferably, the outer end of described axle sleeve cover has driving ring, and driving ring is fixed on axle sleeve in rotating shaft by the 4th screw; The joint, outer ring of the inner ring of described outer press cover and axle sleeve is provided with restrictor ring; The outside of the exterior edge face of outer press cover is provided with mounting plate, and mounting plate is fastened in the outer ring groove of axle sleeve, so that axially locating outer press cover.
By controlling design and the assembly parameter of the secondary mechanical seal device of the above-mentioned anti-injection of prepackage, prevent a method of spraying, it is characterized in that:
The pressure F1 of a, analysis two-level spring: when primary seal lost efficacy, medium sprays suddenly, pressure medium acts on the interior edge face of orifice sleeve, promote the distance that moving ring assembly moves t2, Steel Cable Baffle Ring is slipped into and be preset in the circular groove on axle sleeve, the total compression amount of two-level spring is t1+t2-t3, and according to Hooke's law F=kx, (wherein k is [coefficient of, and the spring model adopting according to reality is known; X is the deformation quantity of spring, i.e. above-mentioned t1+t2-t3), can calculate the pressure F1 of spring;
B, analysis medium act on the pressure F2 of orifice sleeve interior edge face: the inner medium pressure in primary seal chamber of the secondary mechanical seal device of the anti-injection of above-mentioned prepackage is P1, orifice sleeve) external diameter is d1, orifice sleeve overlaps distance for t2 with the axial dimension of wear ring, the external diameter that secondary rotating seat place axle sleeve is installed is d2, monolateral gap between the internal diameter of wear ring and the external diameter of orifice sleeve is δ, known according to fluid mechanics correlation formula: the pressure P2 that acts on orifice sleeve interior edge face is:
P2=P1-{(?12xμx?t2?x?Q?)/[Лx(d1+2δ1)x(δ)
3]}/2
In above formula, μ is medium kinetic viscosity, and Q is the flow of slit flow loss;
The pressure F2 that acts on orifice sleeve interior edge face is: F2=[(d1
2-d2
2) x Л/4] xP2.
The sliding-frictional resistance F3 of c, analysis secondary seal assembly: when moving ring assembly outwards slides under pressure medium effect, between Steel Cable Baffle Ring and axle sleeve, between the 3rd seal ring and axle sleeve and all produce sliding-frictional resistance between the 4th seal ring and outer press cover inner ring, total sliding-frictional resistance of note secondary seal assembly is F3;
The relation of d, analysis F1, F2 and F3, control the size of F2: when primary seal had just lost efficacy, the distance of secondary moving ring assembly and secondary static components is t3, now moving ring assembly only bear pressure medium F2 and the sliding-frictional resistance F3(F3 reverse with it very little in practice, can ignore), F3 is quantitative, F2 is variable, as the above analysis, F2 is relevant with d1, d2 and δ, in the scope that can bear at secondary seal assembly for the size of assurance F2 in practical application, control the span of δ in 0.2-0.35mm; Moving ring assembly laterally mobile t2 apart from time, secondary seal assembly is stressed is F2, F1 and F3, wherein F1 and F3 are the oppositions of F2, for guaranteeing that the formation of secondary seal end face is that secondary rotating ring is adjacent to secondary stationary ring, need meet F2> (F1+F3), consider the bearing capacity of secondary seal end face simultaneously, control the span of t3 between 0.5-0.8mm.
The beneficial effects of the utility model are:
A, a kind of optimal way, the seal face of secondary static components does not contact when sealing moves with secondary rotating ring seal face, and distance is t3, and in design, t3 value is about 0.5～0.8mm.Its beneficial effect is: 1, secondary seal assembly is standby, does not form under normal circumstances seal face, not consumed power; 2, the both ends of the surface that the utility model is exactly secondary seal assembly with the security seal difference of Double End (or series connection) sealing do not contact, but seal face gap is very little, does not need complicated sealing system.
B, a kind of optimal way, Steel Cable Baffle Ring is contained in by the space that in orifice sleeve and secondary rotating seat right side, step hole forms.Its beneficial effect is: 1, because Steel Cable Baffle Ring has certain elasticity, held radial tightening power tightly with sleeve outer circle, restriction moving ring assembly is to the displacement of stationary ring edge ring member side.If while 2, being the injection of primary seal catastrophic failure, secondary mechanical seal device can automatically be located and prepare.When side medium primary seal catastrophic failure medium outwards sprays, barrier effect because of orifice sleeve and wear ring formation sealing effect, pressure medium directly acts on orifice sleeve back, the thrust producing is pushed the moving ring assembly of two stage sealing device to static components, Steel Cable Baffle Ring slips in the axle sleeve circular groove of corresponding design, secondary rotating seat is butt jump ring end face also, two-level spring in stationary seat is again compressed, total compression amount is (t1+t2-t3), reach premounting sealing design decrement, secondary seal assembly can be started working.Secondary seal face reaches in decrement process before starting contact during this time, has a small amount of medium with no pressure and leaks and be collected into the exterior tubing that outer press cover liquid port connects along secondary seal face.Now by jump ring and Steel Cable Baffle Ring, bear axial force, moving ring assembly is fixed on axle sleeve firmly, by flat key, transmit rotation torque.
When c, primary seal lost efficacy, primary seal chamber in-vivo medium pressure is P1; Orifice sleeve external diameter is d1; Orifice sleeve overlaps distance for t2 with wear ring axial dimension; It is d2 that moving ring assembly place axle sleeve external diameter is installed; Wear ring internal diameter and the monolateral gap delta of orifice sleeve cylindrical, actual value 0.2～0.35mm, the less restriction effect of value is more obvious, and pressure medium loss is less.In the moving ring assembly of secondary seal assembly, the overall drag of the sliding-frictional resistance of the sliding-frictional resistance of sliding-frictional resistance, Steel Cable Baffle Ring and the axle sleeve of the 3rd seal ring and axle sleeve and the 4th seal ring and outer press cover inner ring is F3, according to practical experience, F3 is very little, can ignore.According to fluid mechanics knowledge, along with the movement of moving ring assembly, orifice sleeve overlaps with wear ring axial dimension apart from becoming variable, but is directly proportional to the pressure loss, during calculating, averages; : known according to fluid mechanics correlation formula: the pressure P2 that acts on orifice sleeve 3E back is:
P2=P1-{(?12xμx?t2?x?Q?)/[Лx(d1+2δ1)x(δ)
3]}/2
In above formula, μ is medium kinetic viscosity; Q is the flow of slit flow loss;
The pressure F2 that acts on orifice sleeve 3E back is: F2=[(d1
2-d2
2) x Л/4] xP2.
Further, when the stretch compensation element amount of spring compression of two stage sealing device is (t1+t2-t3), the total elastic force of spring is known quantity F1 when design, by regulating d2 and δ value, can make F2> (F1+F3), also can control the dielectric leakage amount that primary seal assembly leaks into secondary seal assembly.
An optimal way, by regulating above-mentioned various variable, can accomplish the controllability Design of digital of secondary seal assembly, can make this prefabricated secondary seal play a role, and also can the thrust of moving ring assembly can not excessively be impacted member control media.
Further, when the secondary mechanical seal of outside prepackage is started working, be arranged at the pressure rise that the pressure transducer of the first flushing hole exterior tubing surveys in secondary seal chamber and whether surpass setting value, pressure alarm notice control room primary seal had lost efficacy and had sprayed, the the second flushing hole pipeline that is positioned at internal gland is closed, the first rinse mouth pipeline on outer press cover is opened, starting provides washing solution to secondary seal chamber, flushing pressure is higher than former seal chamber pressure, side medium is got back in larger gap along orifice sleeve and wear ring after washing solution coolant seal end face, complete rinse with cooling after, secondary seal assembly starts normal work.Its beneficial effect is: can stop primary seal component failures completely, the serious consequence that medium injection produces, has also won plenty of time for attendant changes primary seal assembly.
D, a kind of optimal way, secondary static components is state type stretch compensation assembly; Its beneficial effect is: two-level spring is not subject to centrifugal forces affect, meanwhile, adopts a plurality of two-level springs uniform, and its axial thrust profiles is more even, and the whole floatability of elastic compensating assembly is better; Little spring is positioned in spring eye uniform on outer press cover to compact structure.An optimal way, the 3rd special screw is locked at outer press cover interior edge face, the 3rd screw big end surface and counterbore butt through the axial counterbore of the large end of stationary seat.
Its beneficial effect is: 1, two-level spring is given to certain decrement t1 and be contained in advance in spring eye; 2, the 3rd screw can be pre-installed on elastic compensating assembly in external sealed gland, is beneficial to assembling, the trueness error of having avoided elastic compensating assembly in bulk to cause when assembling; While 3, making primary seal component failures spray, moving ring assembly moves less distance just can realize the function of secondary seal component sealing simultaneously.
A kind of preferably mode, secondary rotating ring is by the floating type secondary rotating seat hole that is placed in of the 5th seal ring, the interior bore edges that holds secondary rotating ring at secondary rotating seat has an annular R groove, placing the flexible baffle ring of opening is pressed on secondary rotating ring cylindrical conical surface, the axially outwards displacement of restriction secondary rotating ring, the cross section of this baffle ring is circular; It is upper that orifice sleeve rides over the outer step circle of secondary rotating seat afterbody by seam, by the 3rd screw lock, and its end face butt and sleeve outer circle step place.Steel Cable Baffle Ring is arranged on by the space that in orifice sleeve and secondary rotating seat right side, step hole forms; Secondary rotating seat endoporus has a keyway, between the 3rd seal ring and Steel Cable Baffle Ring of secondary rotating seat and shaft room; Sleeve outer circle is furnished with flat key, and there is a circular groove on axle sleeve keyway right side, and circular groove center and Steel Cable Baffle Ring center axial distance are t2, is positioned at Steel Cable Baffle Ring left side; Axle sleeve is also provided with a jump-ring slot jump ring is housed, and jump ring right side and secondary rotating seat left side distance are t2; Internal gland left side the second endoporus is inlaid with wear ring, its internal diameter circle and orifice sleeve cylindrical have a small gap very, monolateral gap delta, if there is jet phenomenon in primary seal catastrophic failure, can play expenditure and pressure effect herein, the control ring seal that is equivalent to pump, orifice sleeve overlaps distance for t2 with wear ring axial dimension.A mode preferably, auxiliary sleeve and one-level rotating seat are split-type design, make moving ring assembly and other sealing components in described secondary seal assembly install more convenient.
Accompanying drawing explanation
Sectional view when Fig. 1 is the work of the utility model primary seal assembly.
Sectional view when Fig. 2 is the work of the utility model secondary seal assembly.
Fig. 3 is part assembly drawing of the present utility model.
Fig. 4 is the perspective view of Fig. 3.
Fig. 5 is assembled sequential schematic of the present utility model.
Embodiment
Below in conjunction with accompanying drawing, the utility model is further described:
As shown in Figures 1 to 5, the technological scheme that the utility model is taked is as follows, a secondary mechanical seal device of pre-installing anti-injection, is characterized in that: comprise outer press cover 5A, internal gland 5B, axle sleeve 6, primary seal assembly and secondary seal assembly, wherein: described axle sleeve 6 is set in rotating shaft 01; Described internal gland 5B is set in the media end of axle sleeve 6, between the inwall of internal gland 5B and the outer wall of axle sleeve 6, forms primary seal chamber, and primary seal assembly is arranged in above-mentioned primary seal chamber; Described outer press cover 5A is set in the atmosphere end of axle sleeve 6, between the inwall of outer press cover 5A and axle sleeve 6 outer walls, forms secondary seal chamber, and secondary seal assembly is contained in above-mentioned secondary seal chamber in advance; Above-mentioned secondary seal assembly comprises secondary moving ring assembly 3 and the secondary static components 4 of separated prepackage, and both do not form seal face, and axial clearance is t3, between secondary moving ring assembly 3 and axle sleeve 6, is provided with Steel Cable Baffle Ring 3D; The outside of the exterior edge face of above-mentioned secondary moving ring assembly 3 is provided with jump ring 6D, and the distance between the exterior edge face of secondary moving ring assembly 3 and jump ring 6D is t2, and the outside of above-mentioned Steel Cable Baffle Ring 3D is provided with circular groove 6E; Distance between the center of circle of the center of circle of Steel Cable Baffle Ring 3D and circular groove 6E is t2; Primary seal component failures, medium injection outwards promotes the distance of t2 by secondary moving ring assembly 3, and Steel Cable Baffle Ring 3D embeds in circular groove 6E, and it is spacing that the exterior edge face of secondary moving ring assembly 3 is adjacent to jump ring 6D, secondary moving ring assembly 3 is adjacent to secondary static components 4, forms secondary seal end face.Further, outer press cover 5A is connected by the 4th screw 5E with interior 5B, by the second seal ring 5C, seals, and between internal gland 5B and the pump housing, also by the second seal ring 5C, seals, and mounting plate 5F is stuck in the circular groove of axle sleeve 6 to sealing location; Between above-mentioned axle sleeve 6 and rotating shaft 01, by the 6th seal ring 6F, seal.
Preferably, described primary seal assembly comprises one-level moving ring assembly 1 and one-level stationary ring 2, wherein: above-mentioned one-level moving ring assembly 1 comprises again one-level rotating ring 1A, one-level rotating seat 1F and one-level spring 1E; Above-mentioned one-level rotating seat 1F is fixed on axle sleeve 6 by the first screw 1G; Above-mentioned one-level rotating ring 1A outer ring is provided with groove, this groove coordinates with the fixture block of one-level rotating seat 1F inner ring, and one-level rotating ring 1A is connected with one-level rotating seat 1F, and the exterior edge face of one-level rotating ring 1A is narrow end surface, the interior edge face of this narrow end surface and one-level stationary ring 2 is adjacent to, and forms primary seal end face; Above-mentioned one-level stationary ring 2 is fixed on the inner side end of internal diameter bulge loop of internal gland 5B, and both seal by the 7th seal ring 2B.
Preferably, between the inner ring of described rotating seat 1F and axle sleeve 6 outer rings, be provided with auxiliary sleeve 1D; The exterior edge face of rotating seat 1F is provided with at least two axial through holes, at least two one-level spring 1E are arranged in this axial hole, the outer end of one-level spring 1E connects throw-out collar 1C, and it is upper that the inner of above-mentioned rotating ring 1A is connected to throw-out collar 1C, and above-mentioned one-level spring 1E provides stretch compensation for rotating ring 1A.
Preferably, described secondary moving ring assembly 3 comprises secondary rotating ring 3A and secondary rotating seat 3C, secondary rotating seat 3C is connected on axle sleeve 6 by flat key 6C, the exterior edge face of secondary rotating seat 3C has annular groove, secondary rotating ring 3A is arranged in above-mentioned annular groove, spacing by stop pin, by the axial screens of baffle ring 3H, the groove end face of secondary rotating seat 3C is stretched out in the exterior edge face of secondary rotating ring 3A.
Preferably, the internal-and external diameter of described secondary rotating seat 3C interior edge face has groove, forms the step anchor ring of middle part projection, and the external diameter groove on secondary rotating seat 3C interior edge face is embedded with orifice sleeve 3E, is provided with Steel Cable Baffle Ring 3D in internal diameter groove; Above-mentioned orifice sleeve 3E is fixed on the interior edge face of secondary rotating seat 3C by the second screw 3F, and the inner of orifice sleeve 3E is stretched in the outer groove surface of internal gland 5B internal diameter bulge loop; In above-mentioned outer groove surface, be provided with wear ring 5H, the outer ring of orifice sleeve 3E does not contact with the inner ring of wear ring 5H, and monolateral gap is between the two δ, forms circumferential weld gap structure, and the scope of above-mentioned monolateral gap delta is 0.2-0.35mm.Further, secondary rotating ring 3A is by the floating type secondary rotating seat 3C hole that is placed in of the 5th seal ring 3B, the interior bore edges that holds secondary rotating ring 3A at secondary rotating seat 3C has an annular R groove, in this annular R groove, place the flexible baffle ring 3H of opening, baffle ring 3H is pressed on the cylindrical conical surface of secondary rotating ring 3A, axially outwards displacement of restriction secondary rotating ring 3A, baffle ring 3H cross section is circular; It is upper that orifice sleeve 3E rides over the outer step circle of secondary rotating seat 3C afterbody by seam, locked right side butt and axle sleeve 6 step places by the second screw 3F.Axle-steel silk back-up ring 3D is contained in by the space that in orifice sleeve 3F and secondary rotating seat 3C right side, step hole forms; Secondary rotating seat 3C endoporus has a keyway, between the 3rd seal ring 3G and Steel Cable Baffle Ring 3D; Axle sleeve 6 cylindricals are furnished with flat key 6C, and there is a circular groove 6E on the keyway right side of axle sleeve 6, and circular groove 6E center and Steel Cable Baffle Ring 3D center axial distance are t2, are positioned at Steel Cable Baffle Ring 3D left side; Axle sleeve 6 is also provided with a jump-ring slot jump ring 6D is housed, and in the right side of jump ring 6D and secondary rotating seat 3C, left side distance is t2; Internal gland 5B left side the second endoporus is inlaid with wear ring 5H, its internal diameter circle and orifice sleeve 3E cylindrical have a small gap very, monolateral gap delta 1, if there is jet phenomenon in primary seal assembly catastrophic failure, can play expenditure and pressure effect herein, the control ring seal that is equivalent to pump, orifice sleeve 3E overlaps distance for t2 with wear ring 5H axial dimension.Further, the seal face of secondary static components 4 does not contact when sealing moves with secondary rotating ring 3A seal face, and distance is t3, and in design, t3 value is 0.5～0.8mm.Because Steel Cable Baffle Ring 3D has certain elasticity, held radial tightening power tightly with sleeve outer circle, restriction secondary moving ring assembly 3 is to static components 4 one side displacements, the utility model does not contact with the end face that the security seal difference of Double End (or series connection) sealing is exactly the black box of secondary seal assembly, but seal face gap is very little, secondary seal assembly is standby, does not need complicated sealing system, not consumed power
.
Preferably, described secondary static components 4 comprises secondary stationary ring 4A, stationary seat 4E and two-level spring 4D; Above-mentioned stationary seat 4E is connected to by the 3rd screw 4B on the inner ring step surface of outer press cover 5A, between stationary seat 4E and the inner ring of outer press cover 5A, is provided with the 4th seal ring 4C, forms slipper seal; Above-mentioned secondary stationary ring 4A is arranged in the scrobicular ring of stationary seat 4E interior edge face, and the interior edge face of secondary stationary ring 4A is narrow end surface, and the exterior edge face distance of this narrow end surface and secondary rotating ring 3A is t3, and the scope of above-mentioned t3 is 0.5-0.8mm.Further, secondary static components 4 is placed in outer press cover 5A endoporus for state type, and some two-level spring 4D are positioned in the axial blind hole that outer press cover 5A distributes along even circumferential, and two-level spring 4D one end ejection is at the large end end face of the secondary stationary seat 4E of secondary static components 4; Some the 3rd special screw 4B are locked at gland 5A interior edge face through the axial counterbore of the large end of secondary stationary seat 4E, the 3rd screw 4B big end surface and counterbore butt, by two-level spring 4D, give certain decrement t1 and be contained in advance in spring eye, by the 4th seal ring 4C, formed the slip radial seal of outer press cover 5A and secondary static components 4A; There is restrictor ring 5D in outer press cover 5A atmospheric side internal diameter second step hole.Reserved secondary static components 4 is state type stretch compensation assembly, and two-level spring 4D is not subject to centrifugal forces affect, meanwhile, adopts a plurality of two-level spring 4D uniform, and its axial thrust profiles is more even, and the whole floatability of secondary static components 4 is better; Two-level spring 4D is positioned in the upper uniform spring eye of outer press cover 5A to compact structure; The 3rd screw 4B can be pre-installed on secondary static components 4 in the outer press cover 5A of sealing, is beneficial to assembling, the trueness error of having avoided secondary static components in bulk to cause when assembling; While also making primary seal component failures spray, secondary moving ring assembly moves less distance just can realize the function of secondary seal component sealing.
Preferably, have at least two axial spring eyes on the inner ring step surface of described outer press cover 5A, above-mentioned at least two two-level spring 4D are arranged in this spring eye, and it is upper that the inner of two-level spring 4D is connected to stationary seat 4E, and for stationary seat, 4E provides elastic compensating; Above-mentioned two-level spring 4D prepackage compression distance is t1.Further, when primary seal assembly catastrophic failure medium outwards sprays, barrier effect because of orifice sleeve 3E and wear ring 5H formation sealing effect, pressure medium directly acts on orifice sleeve back, the thrust producing is pushed secondary moving ring assembly 3 to secondary static components 4,6E in the circular groove of the axle sleeve 6 that the correspondence that slips into Steel Cable Baffle Ring 3D designs, secondary rotating seat 3C is butt jump ring 6D end face also, two-level spring 4D is again compressed, total compression amount is (t1+t2-t3), reach premounting sealing design decrement, secondary seal assembly can normally be worked.Now by jump ring 6D and Steel Cable Baffle Ring 3D, bear axial force, secondary moving ring assembly 3 is fixed on axle sleeve 6 firmly, by flat key 6C, transmit rotation torque.
Preferably, be respectively equipped with the first flushing hole B and the second flushing hole A on described outer press cover 5A and internal gland 5B, the first flushing hole B and the second flushing hole A are communicated with respectively secondary seal chamber and primary seal chamber; On above-mentioned outer press cover 5A, be also provided with liquid port C.When the seal face of secondary seal assembly reaches in decrement process before starting contact, have a small amount of medium with no pressure and along sealing face leakage, be collected into liquid port C and import external pipeline.Further, when the secondary seal assembly of outside prepackage is started working, the pressure transducer that is arranged at the exterior tubing at the first flushing hole B place detects secondary seal cavity pressure and rises over setting value, pressure alarm notice control room primary seal assembly had lost efficacy and had sprayed, the the second rinse mouth A pipeline being positioned on internal gland 5B is closed, the first rinse mouth B pipeline on outer press cover 5A is opened, starting provides washing solution to secondary seal assembly, flushing pressure is higher than former seal chamber pressure, after washing solution coolant seal end face, along the larger gap of orifice sleeve 3E and wear ring 5H, get back to impeller side, default secondary seal assembly starts normal work.Can stop primary seal assembly to spray the serious consequence producing completely, also for attendant changes primary seal assembly, win plenty of time.
Preferably, the outer end of described axle sleeve 6 cover has driving ring 6A, and driving ring 6A is fixed on axle sleeve 6 in rotating shaft 01 by the 4th screw 6B; The inner ring of described outer press cover 5A and the joint, outer ring of axle sleeve 6 are provided with restrictor ring 5D; The outside of the exterior edge face of outer press cover 5A is provided with mounting plate 5F, and mounting plate 5F is fastened in the outer ring groove of axle sleeve 6, so that axially locating outer press cover 5A.
By controlling design and the assembly parameter of the secondary mechanical seal device of the above-mentioned anti-injection of prepackage, prevent a method of spraying, it is characterized in that:
The pressure F1 of a, analysis two-level spring 4D: when primary seal lost efficacy, medium sprays suddenly, pressure medium acts on the interior edge face of orifice sleeve 3E, promote the distance that moving ring assembly 3 moves t2, in the circular groove 6E that Steel Cable Baffle Ring 3D is slipped into be preset on axle sleeve 6, the total compression amount of two-level spring 4D is t1+t2-t3, and according to Hooke's law F=kx, (wherein k is [coefficient of, and the spring model adopting according to reality is known; X is the deformation quantity of spring, i.e. above-mentioned t1+t2-t3), can calculate the pressure F1 of spring;
B, analysis medium act on the pressure F2 of orifice sleeve 3E interior edge face: the inner medium pressure in primary seal chamber of the secondary mechanical seal device of the anti-injection of above-mentioned prepackage is P1, the external diameter of orifice sleeve 3E is d1, orifice sleeve 3E overlaps distance for t2 with the axial dimension of wear ring 5H, the external diameter that secondary rotating seat 3C place axle sleeve 6 is installed is d2, monolateral gap between the external diameter of the internal diameter of wear ring 5H and orifice sleeve 3E is δ, known according to fluid mechanics correlation formula: the pressure P2 that acts on orifice sleeve 3E interior edge face is:
P2=P1-{(?12xμx?t2?x?Q?)/[Лx(d1+2δ1)x(δ)
3]}/2
In above formula, μ is medium kinetic viscosity, and Q is the flow of slit flow loss;
The pressure F2 that acts on orifice sleeve 3E interior edge face is: F2=[(d1
2-d2
2) x Л/4] xP2.
The sliding-frictional resistance F3 of c, analysis secondary seal assembly: when moving ring assembly 3 outwards slides under pressure medium effect, between Steel Cable Baffle Ring 3D and axle sleeve 6, between the 3rd seal ring 3G and axle sleeve and all produce sliding-frictional resistance between the 4th seal ring 4C and outer press cover 5A inner ring, total sliding-frictional resistance of note secondary seal assembly is F3;
The relation of d, analysis F1, F2 and F3, control the size of F2: when primary seal had just lost efficacy, secondary moving ring assembly 3 is t3 with the distance of secondary static components 4, now moving ring assembly 3 only bear pressure medium F2 and the sliding-frictional resistance F3(F3 reverse with it very little in practice, can ignore), F3 is quantitative, F2 is variable, as the above analysis, F2 is relevant with d1, d2 and δ, in the scope that can bear at secondary seal assembly for the size of assurance F2 in practical application, control the span of δ in 0.2-0.35mm; Moving ring assembly 3 laterally mobile t2 apart from time, secondary seal assembly is stressed is F2, F1 and F3, wherein F1 and F3 are the oppositions of F2, for guaranteeing that the formation of secondary seal end face is that secondary rotating ring 3A is adjacent to secondary stationary ring 4A, need meet F2> (F1+F3), consider the bearing capacity of secondary seal end face simultaneously, control the span of t3 between 0.5-0.8mm.
Embodiment of the present utility model just introduces its embodiment, does not lie in and limits its protection domain.The technician of the industry can make some and revise under the inspiration of the present embodiment, and the equivalence of doing according to the utility model the scope of the claims therefore all changes or modifies, and all belongs within the scope of the utility model Patent right requirement.
Claims (9)
1. a secondary mechanical seal device for the anti-injection of prepackage, is characterized in that: comprise outer press cover (5A), internal gland (5B), axle sleeve (6), primary seal assembly and secondary seal assembly, wherein: described axle sleeve (6) is set in rotating shaft (01); Described internal gland (5B) is set in the media end of axle sleeve (6), between the inwall of internal gland (5B) and the outer wall of axle sleeve (6), forms primary seal chamber, and primary seal assembly is arranged in above-mentioned primary seal chamber; Described outer press cover (5A) is set in the atmosphere end of axle sleeve (6), between the inwall of outer press cover (5A) and axle sleeve (6) outer wall, forms secondary seal chamber, and secondary seal assembly is contained in above-mentioned secondary seal chamber in advance; Above-mentioned secondary seal assembly comprises secondary moving ring assembly (3) and the secondary static components (4) of separated prepackage, and both do not form seal face, and axial clearance is t3, between secondary moving ring assembly (3) and axle sleeve (6), is provided with Steel Cable Baffle Ring (3D); The outside of the exterior edge face of above-mentioned secondary moving ring assembly (3) is provided with jump ring (6D), and the distance between the exterior edge face of secondary moving ring assembly (3) and jump ring (6D) is t2, and the outside of above-mentioned Steel Cable Baffle Ring (3D) is provided with circular groove (6E); Distance between the center of circle of the center of circle of Steel Cable Baffle Ring (3D) and circular groove (6E) is t2; Primary seal component failures, medium injection outwards promotes secondary moving ring assembly (3) distance of t2, Steel Cable Baffle Ring (3D) embeds in circular groove (6E), it is spacing that the exterior edge face of secondary moving ring assembly (3) is adjacent to jump ring (6D), secondary moving ring assembly (3) is adjacent to secondary static components (4), forms secondary seal end face.
2. a kind of secondary mechanical seal device of pre-installing anti-injection according to claim 1, it is characterized in that: described primary seal assembly comprises one-level moving ring assembly (1) and one-level stationary ring (2), wherein: above-mentioned one-level moving ring assembly (1) comprises again one-level rotating ring (1A), one-level rotating seat (1F) and one-level spring (1E); Above-mentioned one-level rotating seat (1F) is fixed on axle sleeve (6) by the first screw (1G); Above-mentioned one-level rotating ring (1A) outer ring is provided with groove, this groove coordinates with the fixture block of one-level rotating seat (1F) inner ring, one-level rotating ring (1A) is connected with one-level rotating seat (1F), the exterior edge face of one-level rotating ring (1A) is narrow end surface, the interior edge face of this narrow end surface and one-level stationary ring (2) is adjacent to, and forms primary seal end face; Above-mentioned one-level stationary ring (2) is fixed on the inner side end of internal diameter bulge loop of internal gland (5B).
3. a kind of secondary mechanical seal device of pre-installing anti-injection according to claim 2, is characterized in that: between the inner ring of described rotating seat (1F) and axle sleeve (6) outer ring, be provided with auxiliary sleeve (1D); The exterior edge face of one-level rotating seat (1F) is provided with at least two axial through holes, at least two one-level springs (1E) are arranged in this axial hole, the outer end linking springs seat (1C) of one-level spring (1E), it is upper that the inner of above-mentioned rotating ring (1A) is connected to spring seat (1C), and above-mentioned one-level spring (1E) provides stretch compensation for rotating ring (1A).
4. according to a kind of secondary mechanical seal device of pre-installing anti-injection described in any one in claim 1-3, it is characterized in that: described secondary moving ring assembly (3) comprises secondary rotating ring (3A) and secondary rotating seat (3C), secondary rotating seat (3C) is connected on axle sleeve (6) by flat key (6C), the exterior edge face of secondary rotating seat (3C) has annular groove, secondary rotating ring (3A) is arranged in above-mentioned annular groove, spacing by stop pin, by axially screens of baffle ring (3H), the groove end face of secondary rotating seat (3C) is stretched out in the exterior edge face of secondary rotating ring (3A).
5. a kind of secondary mechanical seal device of pre-installing anti-injection according to claim 4, it is characterized in that: the internal-and external diameter of described secondary rotating seat (3C) interior edge face has groove, form the step anchor ring of middle part projection, external diameter groove on secondary rotating seat (3C) interior edge face is embedded with orifice sleeve (3E), is provided with Steel Cable Baffle Ring (3D) in internal diameter groove; Above-mentioned orifice sleeve (3E) is fixed on the interior edge face of secondary rotating seat (3C) by the second screw (3F), and the inner of orifice sleeve (3E) is stretched in the outer groove surface of internal gland (5B) internal diameter bulge loop; In above-mentioned outer groove surface, be provided with wear ring (5H), the inner ring of the outer ring of orifice sleeve (3E) and wear ring (5H) is for being slidably connected, and monolateral gap is between the two δ, forms circumferential weld gap structure, and the scope of above-mentioned monolateral gap delta is 0.2-0.35mm.
6. a kind of secondary mechanical seal device of pre-installing anti-injection according to claim 5, is characterized in that: described secondary static components (4) comprises secondary stationary ring (4A), stationary seat (4E) and two-level spring (4D); Above-mentioned stationary seat (4E) is connected on the inner ring step surface of outer press cover (5A) by the 3rd screw (4B), between stationary seat (4E) and the inner ring of outer press cover (5A), is provided with the 4th seal ring (4C), forms slipper seal; Above-mentioned secondary stationary ring (4A) is arranged on stationary seat (4E) interior edge face in scrobicular ring, and the interior edge face of secondary stationary ring (4A) is narrow end surface, and the exterior edge face distance of this narrow end surface and secondary rotating ring (3A) is t3, and the scope of above-mentioned t3 is 0.5-0.8mm.
7. a kind of secondary mechanical seal device of pre-installing anti-injection according to claim 6, it is characterized in that: on the inner ring step surface of described outer press cover (5A), have at least two axial spring eyes, above-mentioned at least two two-level springs (4D) are arranged in this spring eye, it is upper that the inner of two-level spring (4D) is connected to stationary seat (4E), for stationary seat (4E) provides elastic compensating; Above-mentioned two-level spring (4D) prepackage compression distance is t1.
8. a kind of secondary mechanical seal device of pre-installing anti-injection according to claim 7, it is characterized in that: on described outer press cover (5A) and internal gland (5B), be respectively equipped with flushing hole (B) and flushing hole (A), the first flushing hole (B) and the second flushing hole (A) are communicated with respectively secondary seal chamber and primary seal chamber; On above-mentioned outer press cover (5A), be also provided with liquid port (C), liquid port (C) is discharged primary seal component failures, and the seal face of secondary seal assembly enters the medium in secondary seal chamber while not yet forming.
9. a kind of secondary mechanical seal device of pre-installing anti-injection according to claim 8, it is characterized in that: the outer end cover of described axle sleeve (6) has driving ring (6A), and driving ring (6A) is fixed on axle sleeve (6) in rotating shaft (01) by the 4th screw (6B); The joint, outer ring of the inner ring of described outer press cover (5A) and axle sleeve (6) is provided with restrictor ring; The outside of the exterior edge face of outer press cover (5A) is provided with mounting plate (5F), and mounting plate (5F) is fastened in the outer ring groove of axle sleeve (6), so that axially locating outer press cover (5A).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420004500.8U CN203770644U (en) | 2014-01-06 | 2014-01-06 | Preinstalled secondary mechanical sealing device with jetting prevention function |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420004500.8U CN203770644U (en) | 2014-01-06 | 2014-01-06 | Preinstalled secondary mechanical sealing device with jetting prevention function |
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| Publication Number | Publication Date |
|---|---|
| CN203770644U true CN203770644U (en) | 2014-08-13 |
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ID=51287835
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420004500.8U Withdrawn - After Issue CN203770644U (en) | 2014-01-06 | 2014-01-06 | Preinstalled secondary mechanical sealing device with jetting prevention function |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103759008A (en) * | 2014-01-06 | 2014-04-30 | 东莞市华汇精密机械有限公司 | Preassembled ejection preventive two-stage mechanical sealing device and ejection preventive method for same |
| CN104405882A (en) * | 2014-11-26 | 2015-03-11 | 胡炜平 | Shaft seal |
| CN107676486A (en) * | 2016-08-02 | 2018-02-09 | 宜兴优纳特机械有限公司 | A kind of Special seal for being applied to air blower and vavuum pump |
| CN110094507A (en) * | 2019-04-22 | 2019-08-06 | 南安市商宏机械科技有限公司 | A kind of water seal arrangement of water supply and drainage pump |
| CN110206890A (en) * | 2019-06-06 | 2019-09-06 | 密友集团有限公司 | Interior leakage collecting tank applied to enamel mechanically-sealing apparatus |
| CN113062983A (en) * | 2021-04-29 | 2021-07-02 | 四川大学 | Two-stage pressure reduction rotary dynamic sealing device |
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2014
- 2014-01-06 CN CN201420004500.8U patent/CN203770644U/en not_active Withdrawn - After Issue
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103759008A (en) * | 2014-01-06 | 2014-04-30 | 东莞市华汇精密机械有限公司 | Preassembled ejection preventive two-stage mechanical sealing device and ejection preventive method for same |
| 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 |
| CN104405882A (en) * | 2014-11-26 | 2015-03-11 | 胡炜平 | Shaft seal |
| CN107676486A (en) * | 2016-08-02 | 2018-02-09 | 宜兴优纳特机械有限公司 | A kind of Special seal for being applied to air blower and vavuum pump |
| CN110094507A (en) * | 2019-04-22 | 2019-08-06 | 南安市商宏机械科技有限公司 | A kind of water seal arrangement of water supply and drainage pump |
| CN110094507B (en) * | 2019-04-22 | 2020-09-15 | 安徽绿环泵业有限公司 | Water seal device of water supply and drainage pump |
| CN110206890A (en) * | 2019-06-06 | 2019-09-06 | 密友集团有限公司 | Interior leakage collecting tank applied to enamel mechanically-sealing apparatus |
| CN113062983A (en) * | 2021-04-29 | 2021-07-02 | 四川大学 | Two-stage pressure reduction rotary dynamic sealing device |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20140813 Effective date of abandoning: 20160217 |
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