CN203670779U - Gas film sealing device with combined shaft end seal - Google Patents

Gas film sealing device with combined shaft end seal Download PDF

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Publication number
CN203670779U
CN203670779U CN201320855310.2U CN201320855310U CN203670779U CN 203670779 U CN203670779 U CN 203670779U CN 201320855310 U CN201320855310 U CN 201320855310U CN 203670779 U CN203670779 U CN 203670779U
Authority
CN
China
Prior art keywords
gas film
film sealing
end seal
shaft end
gas
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CN201320855310.2U
Other languages
Chinese (zh)
Inventor
李松泰
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
China University of Petroleum Beijing CUPB
China University of Petroleum UPC East China
Original Assignee
China University of Petroleum UPC East China
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by China University of Petroleum UPC East China filed Critical China University of Petroleum UPC East China
Priority to CN201320855310.2U priority Critical patent/CN203670779U/en
Application granted granted Critical
Publication of CN203670779U publication Critical patent/CN203670779U/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Abstract

The utility model relates to a gas film sealing device with a combined shaft end seal. According to the technical scheme, the gas film sealing device with the combined shaft end seal comprises a main shaft, a movable ring, a static ring, a spring, a sealing ring and a gas film sealing body. The bottom of the gas film sealing body is the main shaft, and the upper portion of the gas film sealing body is provided with a sealing gas inlet and a sealing gas outlet. A sealing cavity formed by the movable ring, the static ring and the spring is formed in the gas film sealing body. The right end of the gas film sealing body is provided with the combined shaft end seal which is composed of a combined shaft body, a threaded gap and a threaded protrusion. The threaded gap is gradually narrow from left to right. The gas film sealing device has the advantages that the main shaft rotates to provide power, and other power sources are not needed; an auxiliary system is simple; dynamic pressure back pumping of fluids is utilized, and the sealing performance is good; non-contact sealing is adopted, abrasion is relieved, and service life is long; the gas film sealing device with the combined shaft end seal can be used as the shaft end seal and can also be used as a dustproof seal.

Description

A kind of gas film sealing device that adopts combination shaft end seal
Technical field
The utility model relates to a kind of gas film sealing device, particularly a kind of gas film sealing device that adopts combination shaft end seal.
Background technique
In gas film sealing device in the past, general employing labyrinth seal, as shaft end seal, prevents that sealed gas from entering in Seal cage, produces damping by throttling expansion with consumed energy, reduces medium and reveals vertically.Its shortcoming is: leakage rate is large, and the energy that produces exciting is large, and sealing tooth is wearing and tearing or lodging easily, processed complex, and epitrochanterian diaphragm seal is centrifuged sometimes power and throws away.
Summary of the invention
The purpose of this utility model is exactly in view of the foregoing defects the prior art has, and a kind of gas film sealing device that adopts combination shaft end seal is provided, its good seal performance, and long service life, safe and reliable, utilize the dynamic pressure reverse pumping of fluid.
Its technological scheme is: comprise main shaft, rotating ring, stationary ring, spring, seal ring and air film sealed body, the bottom of gas film sealing main body is main shaft, the top of gas film sealing main body is provided with sealing gas entrance and sealing gas outlet, the inside of gas film sealing main body is provided with the Seal cage being made up of rotating ring, stationary ring and spring, be provided with combination shaft end seal at the right-hand member of gas film sealing main body, described combination shaft end seal is made up of built-up shaft main body, thread pitch and thread protrusion, wherein, described thread pitch from left to right reduces gradually.
In combination shaft end seal, the gap of left side thread pitch is greater than the gap of right side thread pitch, and the diameter of left side thread protrusion equals the diameter of right side thread protrusion.
Compared with prior art, its beneficial effect is as follows for the utility model:
(1) utilize main shaft rotation that power is provided, without other power sources;
(2) auxiliary system is simple.Without supplying with sealing liquid, the circulatory system, also without worrying the mixed phenomenon of gas.Barrier gas to gas film sealing is directly used, and forms good concord with primary seal;
(3) utilize the dynamic pressure reverse pumping of fluid, good seal performance;
(4) noncontact seal, reduces wear, long service life;
(5) except as shaft end seal, also can be used as dust sealing and use.
Accompanying drawing explanation
Accompanying drawing 1 is structural representation of the present utility model;
Accompanying drawing 2 is structural drawing of combination shaft end seal of the present utility model;
In upper figure: main shaft 1, rotating ring 2, stationary ring 3, spring 4, combination shaft end seal 5, seal ring 6, gas film sealing main body 7, have sealing gas entrance A and sealing gas outlet B; Left side thread pitch 5.1, right side thread pitch 5.3, left side thread protrusion 5.2, right side thread protrusion 5.4.
Embodiment
By reference to the accompanying drawings 1 and 2, the utility model will be further described:
The utility model comprises main shaft 1, rotating ring 2, stationary ring 3, spring 4, seal ring 6 and air film sealed body 7, the bottom of gas film sealing main body 7 is main shaft 1, the top of gas film sealing main body 7 is provided with sealing gas entrance A and sealing gas outlet B, the inside of gas film sealing main body 7 is provided with the Seal cage being made up of rotating ring 2, stationary ring 3 and spring 4, be provided with combination shaft end seal 5 at the right-hand member of gas film sealing main body 7, described combination shaft end seal 5 is made up of built-up shaft main body, thread pitch and thread protrusion, wherein, described thread pitch from left to right reduces gradually.
Wherein, the gap of left side thread pitch 5.1 is greater than the gap of right side thread pitch 5.3, and the diameter of left side thread protrusion 5.2 equals the diameter of right side thread protrusion 5.4.
On axle sleeve, turning goes out the outside thread that thread pitch reduces gradually, is fixed on main shaft, and sealing gas (being generally nitrogen) is entered by sealing gas entrance (A), and barrier gas is full of whole Seal cage.The a little higher than sealed gas of gas pressure in Seal cage.Because pressure reduction, the fluid of both sides have viscosity, along with the rotation of main shaft, sealing gas enters after combination shaft end seal, produces lateral thrust (to the right) with screw thread rotation, is pushed to right side (catching up with air-flow to the right) in thread pitch from left side.In this process, because gap between screw constantly reduces, as shown in Figure 2.Barrier gas volume is constantly reduced, and pressure raises gradually, makes sealing load be not less than the pressure of sealed fluid, thereby stops the generation of revealing.

Claims (2)

1. one kind adopts the gas film sealing device of combination shaft end seal, comprise main shaft (1), rotating ring (2), stationary ring (3), spring (4), seal ring (6) and air film sealed body (7), the bottom of gas film sealing main body (7) is main shaft (1), the top of gas film sealing main body (7) is provided with sealing gas entrance (A) and sealing gas outlet (B), the inside of gas film sealing main body (7) is provided with by rotating ring (2), the Seal cage of stationary ring (3) and spring (4) composition, it is characterized in that: be provided with combination shaft end seal (5) at the right-hand member of gas film sealing main body (7), described combination shaft end seal (5) is by built-up shaft main body, thread pitch and thread protrusion composition, wherein, described thread pitch from left to right reduces gradually.
2. the gas film sealing device of employing combination shaft end seal according to claim 1, it is characterized in that: in combination shaft end seal (5), the gap of left side thread pitch (5.1) is greater than the gap of right side thread pitch (5.3), and the diameter of left side thread protrusion (5.2) equals the diameter of right side thread protrusion (5.4).
CN201320855310.2U 2013-12-24 2013-12-24 Gas film sealing device with combined shaft end seal Expired - Fee Related CN203670779U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201320855310.2U CN203670779U (en) 2013-12-24 2013-12-24 Gas film sealing device with combined shaft end seal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201320855310.2U CN203670779U (en) 2013-12-24 2013-12-24 Gas film sealing device with combined shaft end seal

Publications (1)

Publication Number Publication Date
CN203670779U true CN203670779U (en) 2014-06-25

Family

ID=50967077

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201320855310.2U Expired - Fee Related CN203670779U (en) 2013-12-24 2013-12-24 Gas film sealing device with combined shaft end seal

Country Status (1)

Country Link
CN (1) CN203670779U (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105156686A (en) * 2015-09-23 2015-12-16 苏州凯诺阳光自动化科技有限公司 Inflatable main shaft sealing structure
CN105927579A (en) * 2016-07-01 2016-09-07 南京林业大学 Inner-leakage-free axial force self-balancing centrifugal fluid conveying device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105156686A (en) * 2015-09-23 2015-12-16 苏州凯诺阳光自动化科技有限公司 Inflatable main shaft sealing structure
CN105927579A (en) * 2016-07-01 2016-09-07 南京林业大学 Inner-leakage-free axial force self-balancing centrifugal fluid conveying device
CN105927579B (en) * 2016-07-01 2019-01-04 南京林业大学 A kind of centrifugal fluid transporter of non-internal leakage axial force self-balancing

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Legal Events

Date Code Title Description
C14 Grant of patent or utility model
GR01 Patent grant
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20140625

Termination date: 20141224

EXPY Termination of patent right or utility model