CN207131864U - A kind of non-contact rotary sealing structure - Google Patents
A kind of non-contact rotary sealing structure Download PDFInfo
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- CN207131864U CN207131864U CN201720993558.3U CN201720993558U CN207131864U CN 207131864 U CN207131864 U CN 207131864U CN 201720993558 U CN201720993558 U CN 201720993558U CN 207131864 U CN207131864 U CN 207131864U
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- gap
- air flue
- rotary shaft
- seal receptacle
- sealing structure
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Abstract
The utility model discloses a kind of non-contact rotary sealing structure, including seal receptacle and rotary shaft；Rotary shaft is actively located in seal receptacle, so as to form gap along rotary shaft length direction between rotary shaft and seal receptacle；One end of seal receptacle is covered with gland；Air inlet is provided with gland；The first air flue connected with air inlet is provided with gland；The first air flue of connection and second air flue in gap are provided with seal receptacle；Some expansion chambers connected with gap are circumferentially provided with along seal receptacle inner peripheral surface；Some expansion chambers are intervally arranged along gap length direction；First air flue, the second airway diameter are all higher than gap width；The volume of expansion chamber is more than gap width, improves the service life of rotary shaft and seal receptacle and ensures air-tightness of the rotary shaft in rotary course.
Description
Technical field
It the utility model is related to a kind of seal, more particularly to a kind of non-contact rotary sealing structure.
Background technology
At present, in the design of existing sealing structure, contact seal knot is typically used for the seal of high speed rotation
Structure is more, still, due to revolving part and seal Long Term Contact in existing contact seal, exists rub in use
Wipe, revolving part contact surface in high speed processes has amount of heat generation, easily damages seal and revolving part, causes to seal
Structural failure.
Utility model content
For overcome the deficiencies in the prior art, the purpose of this utility model is to provide a kind of non-contact rotary sealing knot
Structure, seal request is issued in high speed rotation, is hardly damaged simultaneously, there is longer service life.
The purpose of this utility model adopts the following technical scheme that realization：
A kind of non-contact rotary sealing structure, including seal receptacle and rotary shaft；The rotary shaft is actively located in institute
Seal receptacle is stated, gap is formed along the rotary shaft length direction between the rotary shaft and the seal receptacle；The seal receptacle
One end is covered with gland；Air inlet is provided with the gland；The first air flue connected with the air inlet is provided with the gland；
The second air flue for connecting first air flue and the gap is provided with the seal receptacle；Along seal receptacle inner peripheral surface week
To being provided with some expansion chambers connected with the gap；Some expansion chambers are intervally arranged along the gap length direction；Institute
State the first air flue, second airway diameter is all higher than the gap width；The volume of the expansion chamber is more than the relief width
Degree.
Further, some expansion chamber volume sizes are consistent.
Further, the both sides of the expansion chamber are each formed with the side wall for the revolution air-flow that rebounds；Described non-contact
The radially projecting direction of formula rotary seal structure, the plane where the gap of sidewall slope described in both sides；Side wall described in both sides
Incline direction is opposite；The extended line of side wall described in both sides intersects at an acute angle, and the sharp-angled apex is towards the expansion chamber away from institute
State the side in gap.
Further, one end end face of the rotary shaft away from the gland is provided with gas outlet；It is provided with the rotary shaft
Connect the 3rd air flue of the gap and the gas outlet.
Further, the end that second air flue connects with the gap forms first port；3rd air flue with
The end of the gap connection forms second port；Second port described in the first port face.
Further, gas annular groove is provided with first port.
Further, the air inlet, first air flue, second air flue, the 3rd air flue and it is described go out
Gas port is two, respectively the both sides in the non-contact rotary sealing structure.
Compared with prior art, the beneficial effects of the utility model are：
By setting some expansion chambers in seal receptacle, when rotary shaft works and rotated, air inlet ventilation, air-flow passes through the
One air flue and the second air flue enter less gap, enter larger swollen in space further along the gap between rotary shaft and seal receptacle
Swollen chamber, air-flow from the second air flue enter gap when by throttling action, gas flow rate increase, pressure reduces, when air-flow enter it is swollen
Extremely strong whirlpool can be formed by dilatation, gas volume increase suddenly after swollen chamber, speed reduces and pressure increases, so that
Sealing is formed between rotary shaft and seal receptacle to be attempted by rotary shaft rotary course and does not contact with seal receptacle, improve rotary shaft with
The service life of seal receptacle, the first air flue and the second air flue are also difficult to seepage by the airflow influence in expansion chamber, reach sealing
Purpose.
Brief description of the drawings
Fig. 1 is the utility model non-contact rotary sealing structure sectional view；
Fig. 2 is Fig. 1 A portions zoomed-in view.
In figure：10th, seal receptacle；20th, rotary shaft；30th, gland；11st, gap；12nd, the second air flue；121st, first port；
1211st, gas annular groove；13rd, expansion chamber；131st, side wall；21st, gas outlet；22nd, the 3rd air flue；221st, second port；23rd, first axle
Hold；24th, second bearing；31st, air inlet；32nd, the first air flue；321st, O-ring；33rd, concave station；40th, stomata；50th, plug.
Embodiment
Below, with reference to accompanying drawing and embodiment, the utility model is described further, it is necessary to explanation is,
On the premise of not colliding, it can be formed in any combination between various embodiments described below or between each technical characteristic new
Embodiment.
As shown in Figure 1-2, in order to improve the service life of rotary shaft 20 and seal receptacle 10, while meet that rotary shaft 20 exists
Sealing demand in rotary course, the utility model provide a kind of non-contact rotary sealing structure, and the non-contact rotary is close
Seal structure includes seal receptacle 10 and rotary shaft 20；Rotary shaft 20 is actively located in seal receptacle 10, rotary shaft 20 and seal receptacle 10
Between along the length direction of rotary shaft 20 formed gap 11；One end of seal receptacle 10 is covered with gland 30.In this example, rotary shaft 20 with
Seal receptacle 10 uses gap to coordinate (gap delta 0.01mm-0.035mm), and rotary shaft 20 is located at the both ends socket in seal receptacle 10
There are clutch shaft bearing 23 and second bearing 24, wherein clutch shaft bearing 23 and the preferably deep groove ball bearing of second bearing 24, clutch shaft bearing
23 are interference fitted with the inner ring of second bearing 24 with rotary shaft 20, and clutch shaft bearing 23 is arranged on one of seal receptacle 10 away from gland 30
End, coordinated with seal receptacle 10 using gap, and the end face of clutch shaft bearing 23 and the end face of seal receptacle 10, ensure contactless
The structural compactness and sealing of rotary seal structure；Second bearing 24 is arranged on seal receptacle 10 close to one end of gland 30,
The outer ring side of second bearing 24 is coordinated with seal receptacle 10 using gap, and opposite side is coordinated with gland 30 using gap.In addition, pressure
Set 30 is additionally provided with for compressing the outer face concave station 33 of second bearing 24, is locked gland 30 and seal receptacle 10 by screw, is ensured
Gland 30 compresses second bearing 24 in rotary shaft 20；Air inlet 31 is provided with gland 30；It is provided with gland 30 and air inlet 31
First air flue 32 of connection, it is preferred that air inlet 31 is located at one end end face of the gland 30 away from seal receptacle 10, and the first air flue 32 divides
Not Lian Tong air inlet 31 and gland 30 other end end face；First air flue 32 of connection and gap 11 are provided with seal receptacle 10
Second air flue 12, it is contemplated that deep hole machining has certain difficulty, and the first air flue 32 and the second air flue 12 in this example move towards equal
It is relatively parallel or vertical with rotary shaft 20, during the first air flue 32 and the second air flue 12 is processed, when running into air flue needs
, it is necessary to be drilled from the opposite side of gland 30 and seal receptacle 10 perpendicular to the direction of rotary shaft 20 during turn, therefore adding
Work can leave some stomatas 40 connected with the first air flue 32 and the second air flue 12 later, after completion of processing, the gas that has more
Hole 40 is blocked using plug 50 to it, and the connection end of the first air flue 32 and the second air flue 12 is carried out close using O-ring 321
Envelope, ensure air-tightness；Some expansion chambers 13 connected with gap 11 are circumferentially provided with along the inner peripheral surface of seal receptacle 10；Some expansion chambers
13 are intervally arranged along the length direction of gap 11；First air flue 32, the diameter of the second air flue 12 are all higher than the width of gap 11；Expansion chamber 13
Volume be more than the width of gap 11.
When rotary shaft 20 works relative to seal receptacle 10 and rotated, air inlet 31 is passed through gas, into the gas of air inlet 31
Body pressure is P0, and gas enters the gap 11 of narrow space by throttling action, gas from the first air flue 32 and the second air flue 12
Flow velocity increase, heat energy is converted to kinetic energy, while temperature reduces, and the air pressure P1 in gap 11 reduces (now P1<P0), with
Gas enters the expansion chamber 13 that volume is much larger than gap 11 after the throttling action in gap 11 afterwards, and now gas can be by dilatation
Effect, gas volume increase suddenly, form extremely strong whirlpool, and speed reduces, the air pressure increase in expansion chamber 13, but air pressure
The amplitude very little of increase, can regard as being maintained to flow through pressure during throttle clearance 11, then be sequentially entered again along gap 11 between
The expansion chamber 13 that the length direction of gap 11 is intervally arranged, so as to form labyrinth seal between seal receptacle 10 and rotary shaft 20 (as schemed institute
Show, expansion chamber 13 is respectively from the air pressure for corresponding to gap 11 toward one end away from the first air flue 32 close to one end of the first air flue 32
P1, P2, P3 ...), gas is producing very big energy expenditure by repeatedly throttling and dilatation, and air pressure greatly declines
(i.e. P1>P2>P3 ...) so that the gas in the first air flue 32 and the second air flue 12 is difficult to seepage, reach the purpose of sealing,
Also can be kept certain distance with seal receptacle 10 by effects of air pressure in the rotary course of rotary shaft 20, extend rotary shaft 20 with it is close
Seal the service life of seat 10.
In order to stablize the air pressure ratio between some expansion chambers 13, some volume sizes of expansion chamber 13 are consistent.
In order to optimize whirlpool spin intensity of the gas in expansion chamber 13, the both sides of expansion chamber 13 are each formed with being used to rebound
Turn round the side wall 131 of air-flow；In the radially projecting direction of non-contact rotary sealing structure, both sides side wall 131 favours gap
11 place planes；The incline direction of both sides side wall 131 is opposite；The extended line of both sides side wall 131 intersects at an acute angle, it is preferred that acute angle
Angle is 60 °, and sharp-angled apex is towards side of the expansion chamber 13 away from gap 11.
In order to discharge unnecessary gas in the course of work of rotary shaft 20, one end end face of the rotary shaft 20 away from gland 30 is opened
There is gas outlet 21；The 3rd air flue 22 of communication gap 11 and gas outlet 21 is provided with rotary shaft 20, likewise, in order to reduce by
The difficulty of processing of three air flues 22, the 3rd air flue 22 are located in rotary shaft 20 parallel or perpendicular to rotary shaft 20, process formation
Unnecessary stomata 40 is blocked using plug 50.
In order to preferably allow gas to enter gap 11 and preferably unnecessary gas be discharged, the second air flue 12 with
The end that gap 11 connects forms first port 121；The end that 3rd air flue 22 connects with gap 11 forms second port 221；
The face second port 221 of first port 121, the air pressure P1 of air inlet 31 is set to be consistent substantially with the air pressure P of gas outlet 21.
In order to facilitate the assembling of rotary shaft 20 and seal receptacle 10, gas annular groove 1211 is provided with first port 121, avoids revolving
Second air flue 12 docks influence assembling for 22 mouthfuls with the 3rd air flue end when rotating shaft 20 is installed with seal receptacle 10.
Air inlet 31, the first air flue 32, the second air flue 12, the 3rd air flue 22 and gas outlet 21 are two, respectively position
Both sides in non-contact rotary sealing structure, identical air inlet is oppositely arranged in the both sides of non-contact rotary sealing structure
The 31, first air flue 32 of mouth, the second air flue 12, the 3rd air flue 22 and gas outlet 21 simultaneously use identical attachment structure, make gap
11 and expansion chamber 13 in gas it is more uniform.
Above-mentioned embodiment is only preferred embodiment of the present utility model, it is impossible to is protected with this to limit the utility model
Scope, the change of any unsubstantiality that those skilled in the art is done on the basis of the utility model and replacing belongs to
In the utility model scope claimed.
Claims (7)
- A kind of 1. non-contact rotary sealing structure, it is characterised in that：Including seal receptacle and rotary shaft；The rotary shaft is actively located in the seal receptacle, the rotary shaft and the sealing Between seat gap is formed along the rotary shaft length direction；One end of the seal receptacle is covered with gland；It is provided with the gland Air inlet；The first air flue connected with the air inlet is provided with the gland；Connection described first is provided with the seal receptacle Air flue and second air flue in the gap；Along the seal receptacle inner peripheral surface be circumferentially provided with it is some connect with the gap it is swollen Swollen chamber；Some expansion chambers are intervally arranged along the gap length direction；First air flue, second airway diameter are equal More than the gap width；The volume of the expansion chamber is more than the gap width.
- 2. non-contact rotary sealing structure as claimed in claim 1, it is characterised in that：Some expansion chamber volume sizes Unanimously.
- 3. non-contact rotary sealing structure as claimed in claim 2, it is characterised in that：The both sides of the expansion chamber are respectively formed There is the side wall for the revolution air-flow that rebounds；In the radially projecting direction of the non-contact rotary sealing structure, side described in both sides Wall favours plane where the gap；Sidewall slope is in opposite direction described in both sides；The extended line of side wall described in both sides is intersecting to be in Acute angle, the sharp-angled apex is towards side of the expansion chamber away from the gap.
- 4. non-contact rotary sealing structure as claimed in claim 1, it is characterised in that：The rotary shaft is away from the gland One end end face be provided with gas outlet；The 3rd air flue for connecting the gap and the gas outlet is provided with the rotary shaft.
- 5. non-contact rotary sealing structure as claimed in claim 4, it is characterised in that：Second air flue and the gap The end of connection forms first port；The end that 3rd air flue connects with the gap forms second port；Described first Second port described in the face of port.
- 6. non-contact rotary sealing structure as claimed in claim 5, it is characterised in that：Ring is provided with first port Groove.
- 7. non-contact rotary sealing structure as claimed in claim 5, it is characterised in that：The air inlet, first gas Road, second air flue, the 3rd air flue and the gas outlet are two, close positioned at the non-contact rotary respectively Both sides in seal structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720993558.3U CN207131864U (en) | 2017-08-09 | 2017-08-09 | A kind of non-contact rotary sealing structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720993558.3U CN207131864U (en) | 2017-08-09 | 2017-08-09 | A kind of non-contact rotary sealing structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207131864U true CN207131864U (en) | 2018-03-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720993558.3U Active CN207131864U (en) | 2017-08-09 | 2017-08-09 | A kind of non-contact rotary sealing structure |
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| CN (1) | CN207131864U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107477187A (en) * | 2017-08-09 | 2017-12-15 | 广州市昊志机电股份有限公司 | A kind of non-contact rotary sealing structure |
-
2017
- 2017-08-09 CN CN201720993558.3U patent/CN207131864U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107477187A (en) * | 2017-08-09 | 2017-12-15 | 广州市昊志机电股份有限公司 | A kind of non-contact rotary sealing structure |
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