CN208651629U - A kind of high pressure resistant combined type throw-out collar and its dry gas sealing device - Google Patents

Abstract

The utility model relates to a kind of high pressure resistant combined type throw-out collar and its dry gas sealing devices, including the rotating ring and irrotational stationary ring opposite and that axial floating can be made with rotating ring that can be rotated with rotary shaft, the throw-out collar body and throw-out collar set are removable split type structure, there is the inner hole passed through for rotary shaft in the middle part of the annulus, sealing ring is provided between hole face and the throw-out collar set of the inner hole, the elastic construction is used for so that throw-out collar body has the trend to rotating ring end motion always, the throw-out collar, which puts on to be provided with, deviates from the boss that elastic construction end contradicts with throw-out collar body, due to make stationary seat by traditional " annular groove " formula structure be changed to simply be only single sagittal plane ring structure axial direction bottom form, it eliminates the stationary seat axial direction bottom plane that stress is concentrated in traditional " annular groove " structure and connect corner structure with inside cylindrical body peripheral wall, and by The radial structure deformation of the inside cylindrical body caused by it, so that stationary seat is less prone to plastic deformation or localized cracks.

Description

A kind of high pressure resistant combined type throw-out collar and its dry gas sealing device

Technical field

The utility model relates to mechanically-sealing apparatus, in particular to a kind of high pressure resistant combined type throw-out collar and its dry gas seals dress It sets.

Background technique

Dry gas seals be dry operating air seal be will slot sealing technique be used for air seal a kind of novel shaft end it is close Envelope, belongs to non-contact seals.

A kind of existing dry gas sealing device, structure as shown in Figure 1, include can with rotary shaft 16 rotate rotating ring 1, and The irrotational stationary ring 2 of axial floating is oppositely arranged and can made through shaft end sealing surface and rotating ring 1, rotating ring 1 is with its inner hole surface and non- Seal face is positioned and can be fixed on axle sleeve 18 through structures such as trundles, and axle sleeve 18 is fixed on rotary shaft 16 again with its inner hole surface On, 4 axial floating of elastic constructions such as the throw-out collar 3 and spring of stationary ring 2 then through the setting that is in contact with its non-tight end face 17 is supported on Between stationary seat 5, and fixed in a manner of stop pin etc. in the circumferential.Stationary seat in the dry gas sealing structure of this conventionally form 5, it is " annular groove " the formula structure formed by inside cylindrical body 19 and outside cylindrical body 20 and radial plane of a loop structure；With stationary ring 2 End face directly contact substantially be in single sagittal plane structure throw-out collar 3, then with its inner hole surface clearance fit in stationary seat 5 On the outer peripheral surface of side cylinder 19.As 1 axial restraint of rotating ring of sealing core component, 2 axial floating of stationary ring passes through its axial direction Opposite seal face directly contacts or the sealing of small―gap suture separation realization medium.

Practice display, the stability of sealing and the pressure of sealed medium are closely related.When the pressure of sealing medium is lower, The structure design of sealing, craft precision, matching requirements, material selection etc. have biggish leeway, and can meet well close Seal the field condition of unit, it is ensured that the stable operation of sealing；But with the raising of sealed medium pressure, the leakage rate of sealing, The series of parameters such as deformation, end face frictional wear are all deteriorating.In fact, when pressure medium is higher than 15MPa, sealing condition It can sharply deteriorate, be difficult to be effectively improved sealing from the general treatment measures of structure, technique, assembly, material etc. at present Performance.

Through theoretical calculation and test discovery, the face deformation of stationary ring 2 is to cause the increase of sealing leak amount, end face frictional wear One of the main reason for aggravation, and the throw-out collar 3 and stationary seat 5 that are connected with stationary ring 2 are related to the constrained of stationary ring 2, stress Situation and floatability, these can all influence the face deformation of stationary ring 2 to a certain extent.

In the higher situation of pressure medium, the deformation of stationary seat 5 is big, stress raisers, or even appearance plastic deformation, Localized cracks etc., lead to seal failure.The inside cylindrical body 19 and 20 peripheral wall of outside cylindrical body of stationary seat 5 are in cantilever-shaped knot Structure, inside cylindrical body 19 and outside cylindrical body 20 deform greatly under the action of high-pressure medium pressure, especially crucial inside The deformation of nearly cone cell can be presented in 19 peripheral wall structure of cylinder, can significantly affect the floatability of throw-out collar 3 and the leakproofness of sealing ring 7 Energy；And two corner portions the answering there are highly significant of the radial plane of a loop of stationary seat 5 and inside cylindrical body 19, outside cylindrical body 20 Power is concentrated, and may be occurred being plastically deformed here or situations such as localized cracks, be led to seal failure.

Utility model content

The first of the utility model is designed to provide a kind of high pressure resistant combined type throw-out collar, have when in use not it is easier that Occurs the advantages of plastic deformation or localized cracks on stationary seat.

Above-mentioned first purpose of the utility model has the technical scheme that a kind of high pressure resistant combined type Throw-out collar, including the throw-out collar body for revolving around it the throw-out collar set of axis setting and being set in outside throw-out collar set, the throw-out collar body is along throw-out collar set Radial expansion, the throw-out collar body and throw-out collar set be removable split type structure, the throw-out collar, which is put on, to be provided with and throw-out collar body The boss contradicted towards stationary ring end.

Through the above technical solutions, since throw-out collar is set as removable split type structure, so that throw-out collar stress distribution is more closed Reason, deformation is smaller, improves the high voltage performance of sealing structure, equally, throw-out collar split-type design is more convenient for distinguishing selection to it And processing, especially have significant impact to sealing performance and effect and have high requirements throw-out collar set selection and to its outside cylinder The Precision Machining and detection in face, and throw-out collar split-type design make throw-out collar cover structure it is relatively simple with it is simple, can be convenient Throw-out collar set is processed as to metal product with high hardness and wear-resisting, can easily by throw-out collar set external cylindrical surface, to be processed into surface thick The face of rugosity very little in this way can guarantee throw-out collar set and the stationary seat place of being slidably matched friction very little, for the followability of stationary ring Castering action is obvious so that throw-out collar cover be not easy in sliding process it is stuck.Due to fit system between throw-out collar and throw-out collar seat Change, corresponding throw-out collar seat be then accordingly changed to only outside tubular peripheral wall tubular structure, and be no longer as traditional structure that Sample has " annular groove " formula structure of medial and lateral tubular peripheral wall simultaneously, to be conducive to reduce effect of the pressure medium to throw-out collar seat Range, the deformation of throw-out collar seat are also reduced to only generate the diameter for the outside tubular peripheral wall structure for not making significant difference to throw-out collar floatability To dilatancy, significantly reduce the stress raisers of throw-out collar seat, so that throw-out collar seat is less prone to plastic deformation or part is split Line.

Preferably, for being bonded with the non-tight end face of stationary ring, the throw-out collar set is pasted with stationary ring for one end of the throw-out collar set It is provided with the first smooth smooth surface of surface at conjunction, is provided with the second smooth smooth surface of surface at the boss and the conflict of throw-out collar body.

Through the above technical solutions, the second light of surface roughness very little is processed with throw-out collar body contact position in throw-out collar set Face so that the second smooth surface and throw-out collar body cooperate the latter two contact positions to reach close to zero leakage, and can process on throw-out collar set First smooth surface of surface roughness very little is directly contacted realization sealing with the stationary ring back side by the first smooth surface, eliminates tradition and push away Sealing ring between ring and stationary ring is reduced because of the bring risk of sealing ring failure herein.

Preferably, throw-out collar set end is provided with extended end portion along the axial direction that throw-out collar covers, and the extended end portion is used for It is contradicted with stationary ring, first smooth surface is located at extended end portion and stationary ring conflict and is located in extended end portion.

Through the above technical solutions, setting extended end portion can be convenient the processing and detection of the first smooth surface on throw-out collar set, Equally facilitate the first smooth surface with stationary ring is good is bonded.

Preferably, the throw-out collar body and boss contact position are provided with concave step slot, the boss away from throw-out collar set end with Concave step slot is bonded and joint place is provided with the smooth third smooth surface in surface.

Through the above technical solutions, in order to further enhance the leakproofness between throw-out collar body and throw-out collar set, on throw-out collar body It is provided with concave step slot, may make that there are two contact surfaces for tool between boss and throw-out collar body by concave step slot, by two The second smooth surface and third smooth surface are processed on a contact surface, and throw-out collar can be made to cover and form two sealing surfaces between throw-out collar body, Achieve the effect that dual-seal.

Preferably, the throw-out collar set is hard metal article.

Through the above technical solutions, hard alloy have hardness is high, wear-resisting, intensity and toughness are preferable, it is heat-resisting, corrosion-resistant, A series of excellent performances such as surface quality height, especially its high rigidity and wearability, high rigidity may make the product of the material It is less prone to crack etc., improves the high voltage performance of product, wearability can make product not easy to wear in use, work as processing Out after the smooth surface of surface roughness very little, due to wearability and high rigidity, the smooth surface processed can be made to be hardly damaged.

Preferably, the throw-out collar body is stainless steel products.

Through the above technical solutions, the chemical etchings such as weak corrosive medium and acid, alkali, salt such as the resistance to air of stainless steel, steam, water Property dielectric corrosion, therefore be adapted in use it is a variety of there is corrosive medium, improve the adaptability of product, at the same by It will not be produced relative sliding between the part that throw-out collar body contacts therewith, therefore price inexpensively stainless can be used Steel guarantees to save cost under the premise of product quality.

The second of the utility model is designed to provide a kind of high pressure resistant dry gas sealing device, has and is not easy out on stationary seat The advantages of existing plastic deformation or localized cracks.

Above-mentioned second purpose of the utility model has the technical scheme that a kind of high pressure resistant dry gas is close Seal apparatus further includes the rotating ring that can be rotated with rotary shaft including a kind of high pressure resistant combined type throw-out collar described in above-mentioned technical proposal Irrotational stationary ring that is opposite with rotating ring and can making axial floating, stationary ring pass through the throw-out collar and bullet for the setting that is in contact with its axial end Property structure and stationary seat floating support, the stationary seat includes the cylindrical portion being arranged concentrically with rotary shaft and setting in cylindrical portion one The annulus at end, the annulus revolve around it axis setting, and the inner hole passed through for rotary shaft is equipped in the middle part of the annulus, described Throw-out collar set be bonded with the hole face of inner hole, the inner hole and throw-out collar cover between be provided with sealing ring, the elastic construction for so that Throw-out collar body has the trend to rotating ring end motion always.

Through the above technical solutions, corresponding throw-out collar seat is then corresponding due to the change of fit system between throw-out collar and throw-out collar seat It has been changed to the tubular structure of only outside tubular peripheral wall, and has no longer been as traditional structure while to have medial and lateral tubular all " annular groove " formula structure of wall, to be conducive to reduce pressure medium to the sphere of action of throw-out collar seat, the deformation of throw-out collar seat also reduces It is radially expanded deformation for can only generate the outside tubular peripheral wall structure not made significant difference to throw-out collar floatability, makes the office of throw-out collar seat Portion's stress, which is concentrated, to be significantly reduced, so that throw-out collar seat is less prone to plastic deformation or localized cracks.

Preferably, annular groove is provided in the hole face of the inner hole, the sealing ring is located in annular groove.

Through the above technical solutions, being provided in the hole face of inner hole in order to enable sealing ring is not easily to fall off in use Annular groove, in use, by sealing ring in annular groove.

Preferably, the elastic construction is spring, and the spring one end and annulus contradict the other end and throw-out collar body contradicts.

Through the above technical solutions, spring, which can make throw-out collar body always, to be had to away from annulus end motion trend, protect Demonstrate,prove the followability of stationary ring.

Preferably, locating slot is provided on the annulus, the spring one end is located in locating slot.

Through the above technical solutions, spring can be made more steady in use by setting locating slot.

In conclusion the utility model having the beneficial effect that in contrast to the prior art

(1) since throw-out collar adopts a split structure, make throw-out collar set can choose as hard alloy uniform wearability is more preferable, The high material of surface quality, structure is more simple, rule, and to its exigent axially extending external cylindrical surface of matching surface, Also due to being easier to Precision Machining and detection there is no the limitation of inner cylindrical wall in traditional groove structure.

It (2) is simply only single sagittal plane ring structure due to being changed to stationary seat by traditional " annular groove " formula structure The form of axial bottom had both eliminated stress is concentrated in traditional " annular groove " structure stationary seat axial direction bottom plane and inside cylindrical Body peripheral wall connects corner structure, and the radial structure deformation of the inside cylindrical body resulted from, also significantly reduces simultaneously The stress collection for the corner portion part that the stationary seat axial direction bottom plane retained in the utility model is connect with outside cylindrical body peripheral wall Middle situation, and throw-out collar set can also have smaller deflection and deformation cone angle, to significantly reduce the stress collection in stationary seat Middle state, the cone cell for reducing the cylindrical fit face playing the guiding role between throw-out collar and stationary seat in dry gas sealing device well become Shape is obviously improved sealed high-voltage resistant performance.

Detailed description of the invention

In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only It is some embodiments of the utility model, for those of ordinary skill in the art, in the premise not made the creative labor Under, it is also possible to obtain other drawings based on these drawings.

Fig. 1 is the structural schematic diagram of the prior art；

Fig. 2 is the structural schematic diagram of embodiment one；

Fig. 3 is the structural schematic diagram of throw-out collar set；

Fig. 4 is the structural schematic diagram of throw-out collar body；

Fig. 5 is the structural schematic diagram of embodiment two；

Fig. 6 is the structural schematic diagram of stationary seat.

Appended drawing reference: 1, rotating ring；2, stationary ring；3, throw-out collar；311, throw-out collar set；312, throw-out collar body；4, elastic construction；5, stationary ring Seat；511, cylindrical portion；512, annulus；6, inner hole；7, sealing ring；8, boss；9, the first smooth surface；10, the second smooth surface；11, prolong Stretch end；12, concave step slot；13, third smooth surface；14, annular groove；15, locating slot；16, rotary shaft；17, non-tight end face； 18, axle sleeve；19, inside cylindrical body；20, outside cylindrical body.

Specific embodiment

The utility model is described in further detail below in conjunction with attached drawing.

This specific embodiment is only the explanation to the utility model, is not limitations of the present invention, ability Field technique personnel can according to need the modification that not creative contribution is made to the present embodiment after reading this specification, but As long as all by the protection of Patent Law in the scope of the claims of the utility model.

Embodiment one:

As shown in Figure 2,3, a kind of high pressure resistant combined type throw-out collar, including throw-out collar set 311 and throw-out collar body 312,312 edge of throw-out collar body The radial expansion of rotary shaft 16, throw-out collar body 312 and throw-out collar set 311 be removable split type structure, throw-out collar set 311 on is arranged There is the boss 8 contradicted with throw-out collar body 312 towards stationary ring (2) end.

As shown in Figure 3,4,1 end of rotating ring is provided with extended end portion 11 in throw-out collar set 311, throw-out collar set 311 passes through extension End 11 is bonded with stationary ring 2, and throw-out collar body 312 and 8 contact position of boss are provided with concave step slot 12(referring to Fig. 5), and boss 8 is located at There are two orthogonal contact surface, one of contact surfaces in concave step slot 12 and between boss 8 and concave step slot 12 Deviate from 2 end of stationary ring positioned at boss 8, another contact surface is located at boss 8 and covers 311 ends away from throw-out collar, in the contact for deviating from 2 end of stationary ring It is provided with the second smooth surface 10 on face, third smooth surface 13 is being provided on the contact surface that throw-out collar covers 311 ends, in extended end portion 11 2 joint place of stationary ring is provided with the first smooth surface 9, wherein the first smooth surface 9, the second smooth surface 10, third smooth surface 13 are rough surface The smooth flat and the first smooth surface 9 for spending very little are located in extended end portion 11, and the second smooth surface 10 is located at boss 8 with third smooth surface 13 On.

Wherein, throw-out collar set 311 is high, the wear-resisting and rigid surface quality metal material product of hardness, throw-out collar in the present embodiment Set 311 is hard metal article, and throw-out collar body 312 is stainless steel products.

Embodiment two:

As shown in Figure 5,6, a kind of high pressure resistant dry gas sealing device, including rotating ring 1, stationary ring 2, stationary seat 5 and throw-out collar 3, It is provided between stationary seat 5 and throw-out collar 3 for making throw-out collar 3 always with the elastic construction 4 to 1 end motion trend of rotating ring, it is quiet Ring seat 5 includes revolving around it the setting of axis 16 with 511 annulus 512 of cylindrical portion, annulus 512, having in the middle part of annulus 512 for rotation The inner hole 6 that axis 16 passes through, throw-out collar set 311 are bonded with the hole face of inner hole 6, are provided between hole face and the throw-out collar set 311 of inner hole 6 close Seal 7.

As shown in Figure 5,6, wherein elastic construction 4 is the elastic construction 4 of the conventionally forms such as spring, elasticity in the present embodiment Structure 4 is spring, spring one end and annulus 512 contradict the other end and throw-out collar body 312 contradicts, in the inner hole 6 of annulus 512 Annular groove 14 is provided in hole face, sealing ring 7 is embedded in annular groove 14, and annulus 512 and spring contact position are provided with positioning Slot 15, in use, one end of spring is located in locating slot 15.

In use, when the rotating ring 1 for offering fluid dynamic pressure groove on the outside of end face rotates, height of the fluid dynamic pressure groove outside diameter Pressure separation gas is pumped between seal face, is gradually increased by outer diameter to slot diameter gas film pressure, and from slot diameter to inner radius gas Film pressure is gradually reduced, and because end face membrane pressure increase makes to be formed by opening force greater than the closing force acted on sealing ring, is being rubbed It wipes and forms one layer of very thin air film between pair, so that stationary ring 2 is moved to away from 1 side of rotating ring, stationary ring 2 will push throw-out collar at this time Set 311 slides in inner hole 6, and due to the presence of boss 8, throw-out collar set 311 will drive throw-out collar body 312 to overcome spring movement together, With air-film thickness and air film whether there is or not variation, throw-out collar set 311 will float under the action of the spring with throw-out collar body 312, In the process, throw-out collar set 311 is in a sealed state with 2 contact position of stationary ring, throw-out collar set 311 with 312 contact position of throw-out collar body.

It is close by the above-mentioned dry gas to common throw-out collar structure dry gas sealing device and use the utility model combined type throw-out collar 3 The calculating comparison of seal apparatus shows: cylindrical portion 511 and annulus 512 connect in the stationary seat 5 of the above-mentioned sealing device of the utility model The place of connecing can have smaller stress, and throw-out collar set 311 also has smaller deflection and deformation cone angle.Such as: in pressure limit 1 ~ 20MPa, sealing surface average diameter is under the working condition of 100 ~ 300mm, deformed throw-out collar in the utility model sealing device The cone angle for covering the generation of 311 external cylindrical surfaces is about 0.01 ~ 0.3 degree, and the diametrically deflection of axial ends is about 3 ~ 35 microns, And the cone angle generated after 19 external cylindrical surface of the inside cylindrical body deformation of stationary seat 5 in traditional dry gas seals is about 0.167 ~ 0.83 Degree, diametrically deflection is about 5 ~ 130 microns to axial ends；5 corner portion stress raiser of the utility model stationary seat is answered Power extreme value can more traditional dry gas seals corner portion reduction by 3 ~ 30%.After proving 3 structure of combined type throw-out collar using the utility model Dry gas sealing device can reduce the cone cell deformation in the cylindrical fit face playing the guiding role between throw-out collar 3 and stationary seat 5 well, and The stress collected state in stationary seat 5 is significantly reduced, sealed high-voltage resistant performance is obviously improved, which is suitable for Dry gas sealing structure in JB/T11289-2012 " dry gas seals technical conditions ", in tandem high pressure dry gas seals, (maximum can There is more reliable performance up to using in 20MPa).

The above is only the exemplary embodiment of the utility model, the protection model rather than limited the present invention It encloses, the protection scope of the utility model is determined by the attached claims.

Claims (10)

1. a kind of high pressure resistant combined type throw-out collar, it is characterised in that: throw-out collar set (311) and set including revolving around it axis (16) setting Be located at the throw-out collar body (312) of throw-out collar set (311) outside, the throw-out collar body (312) along throw-out collar set (311) radial expansion, it is described Throw-out collar body (312) and throw-out collar set (311) are removable split type structure, are provided with and throw-out collar body on the throw-out collar set (311) (312) boss (8) contradicted towards stationary ring (2) end.

2. a kind of high pressure resistant combined type throw-out collar according to claim 1, it is characterised in that: the one of the throw-out collar set (311) End is bonded for the non-tight end face (17) with stationary ring (2), and the throw-out collar set (311) and stationary ring (2) joint place are provided with surface Smooth the second smooth surface (10) in surface is provided at smooth the first smooth surface (9), the boss (8) and throw-out collar body (312) conflict.

3. a kind of high pressure resistant combined type throw-out collar according to claim 2, it is characterised in that: throw-out collar set (311) end It is provided with extended end portion (11) along the axial direction of throw-out collar set (311), the extended end portion (11) is used to contradict with stationary ring (2), institute The first smooth surface (9) is stated to be located at extended end portion (11) and stationary ring (2) conflict and be located on extended end portion (11).

4. a kind of high pressure resistant combined type throw-out collar according to claim 1, it is characterised in that: the throw-out collar body (312) with it is convex Platform (8) contact position is provided with concave step slot (12), and the boss (8) is away from throw-out collar set (311) end and concave step slot (12) It is bonded and joint place is provided with the smooth third smooth surface (13) in surface.

5. a kind of high pressure resistant combined type throw-out collar according to claim 1, it is characterised in that: the throw-out collar set (311) is hard Matter alloy product.

6. a kind of high pressure resistant combined type throw-out collar according to claim 1, it is characterised in that: the throw-out collar body (312) is not Become rusty steel part.

7. a kind of high pressure resistant dry gas sealing device, it is characterised in that: including a kind of resistance to height described in claim 1 ~ 6 any one Pressure combined throw-out collar further includes the rotating ring (1) that can be rotated with rotary shaft (16) and opposite with rotating ring (1) and can make axial floating Irrotational stationary ring (2), stationary ring (2) Jing Yuqi axial end are in contact the throw-out collar (3) and elastic construction (4) and stationary seat of setting (5) floating support, the stationary seat (5) include the cylindrical portion (511) being arranged concentrically with rotary shaft (16) and are arranged in cylindrical portion (511) annulus (512) of one end, the annulus (512) revolve around it axis (16) setting, annulus (512) middle part Equipped with the inner hole (6) passed through for rotary shaft (16), the throw-out collar set (311) is bonded with the hole face of inner hole (6), the inner hole (6) Be provided between throw-out collar set (311) sealing ring (7), the elastic construction (4) be used for so that throw-out collar body (312) always have to The trend of rotating ring (1) end motion.

8. high pressure resistant dry gas sealing device according to claim 7, it is characterised in that: set in the hole face of the inner hole (6) It is equipped with annular groove (14), the sealing ring (7) is located in annular groove (14).

9. high pressure resistant dry gas sealing device according to claim 7, it is characterised in that: the elastic construction (4) is spring, The spring one end and annulus (512) contradict the other end and throw-out collar body (312) contradict.

10. high pressure resistant dry gas sealing device according to claim 9, it is characterised in that: be arranged on the annulus (512) Have locating slot (15), the spring one end is located in locating slot (15).