CN103122858A

CN103122858A - Composite sealing device of Roots blower end cover

Info

Publication number: CN103122858A
Application number: CN2011103667776A
Authority: CN
Inventors: 朱文强; 毛法良; 蒋万军
Original assignee: YINGXING UNITE MACHINERY CO Ltd
Current assignee: YINGXING UNITE MACHINERY CO Ltd
Priority date: 2011-11-18
Filing date: 2011-11-18
Publication date: 2013-05-29

Abstract

A composite sealing device of a Roots blower end cover is characterized by comprising a composite moving ring (1), a stationary ring (2), a stationary O-shaped ring (4), a moving O-shaped ring (8) and a pressure relief hole (9). The stationary ring (2) is mounted on the Roots blower end cover (3), the pressure relief hole (9) is reserved in the middle of the end cover (3), and the end cover (3) is sealed with the front portion of the stationary ring (2) through the stationary O-shaped ring (4). The composite moving ring (1) is a long sleeve and is connected with a shaft of the Roots blower through the moving O-shaped ring (8). The composite moving ring (1) is provided with a piston ring groove, and a piston ring (5) is mounted in the piston ring groove. By the aid of the composite sealing device of the Roots blower end cover, reliability of mechanical seal is improved, direct impacts to mechanical seal end surface by a small amount of gas leaked through piston ring seal are avoided, and especially when the Roots blower delivers special gas, security and reliability of oil and gas seal of the Roots blower are greatly improved.

Description

Roots blower end cap compound sealing device

Technical field

[0001] the present invention relates to the roots blower technical field of sealing technology, specifically a kind of at roots blower when carrying special gas (as methane, water vapour etc.), be the roots blower end cap compound sealing device of the risk of leakage that prevents these special gas.

Background technique

[0002] general roots blower is all to be used in air to carry, air is carried the requirement of sealing very low, gas is mainly to seal or labyrinth seal by skeletal structure on end cap, open to atmosphere hole is generally arranged on end cap, allowed the part air to release from the hole, adopting common outside framework oil seal near the bearing side, reach the effect of oil sealing, outside framework oil seal is very high to the size requirement of mounting hole, and the long-time applied at elevated temperature of rubber is easily aging, also will consider the reaction of gas and rubber when carrying other special gas.So when carrying some special gas, general employing mechanical seal seals, mainly add in the market mechanical seal and completely cut off lubricant oil and gas between end cap and bearing, but effect is bad, has portion gas to seal sealing surface by direct impulse machine, and long-play can cause the inefficacy of sealing surface, some producer adds labyrinth seal in the mechanical seal front, but effect neither be fine, can not change gas to the impact of mechanical seal, finally causes the inefficacy of sealing surface.

Summary of the invention

The present invention provides a kind of roots blower end cap compound sealing device in order to overcome the deficiency of above-mentioned roots blower sealing configuration when carrying special gas.

Technological scheme of the present invention is:

a kind of roots blower end cap compound sealing device, described seal arrangement is composite structure, described sealing is arranged between roots blower end cap inner pedestal and roots blower cylinder body, the sealing device is mechanical seal and piston ring packing composite structure, comprise compound rotating ring, stationary ring, the stationary ring "O"-ring, rotating ring "O"-ring and relief hole, stationary ring is arranged on the roots blower end cap, have relief hole in the middle of end cap, the stationary ring front end is by stationary ring "O"-ring and end bracket enclosed, compound rotating ring is a long axle sleeve, compound rotating ring links together by the axle of rotating ring "O"-ring and roots blower, compound rotating ring is provided with the piston ring groove, in the piston ring groove, piston ring is installed.

The place that described end cap and compound rotating ring coordinate is graphite material.

The place that described compound rotating ring and stationary ring coordinate is the cemented carbide material.

Having four holes on described stationary ring communicates with relief hole on end cap.

Described relief hole is connected with inlet of Roots blower.

Have the pressure release return port on described end cap between mechanical seal and piston ring packing.

A kind of roots blower, the bearing hole leading portion on its end cap are equipped with described roots blower end cap compound sealing device.

The invention has the beneficial effects as follows:

Roots blower end cap compound sealing device of the present invention, improved the reliability of mechanical seal, guarantee in cylinder body on a small quantity not direct impulse machine seal face of the gas that leaks by piston ring packing, particularly when roots blower is carried special gas, roots blower oil, the Security of hermetic seal, reliability have greatly been improved.

Description of drawings

Fig. 1 is overall structure schematic diagram of the present invention.

In figure: 1 is that compound rotating ring, 2 is stationary ring, 3 end caps, 4 stationary ring "O"-rings, 5 piston rings, 6 bearings, 7 fuel tanks, 8 rotating ring "O"-rings, 9 relief holes.

Embodiment

The invention will be further described below in conjunction with accompanying drawing:

as Fig. 1, a kind of roots blower end cap compound sealing device, described seal arrangement is composite structure, described sealing is arranged between roots blower end cap inner pedestal and roots blower cylinder body, the sealing device is mechanical seal and piston ring packing composite structure, comprise compound rotating ring 1, stationary ring 2, stationary ring "O"-ring 4, rotating ring "O"-ring 8 and relief hole 9, stationary ring 2 is arranged on roots blower end cap 3, have relief hole 9 in the middle of end cap 3, stationary ring 2 front ends are by stationary ring "O"-ring 4 and end cap 3 sealings, the place that end cap 3 and compound rotating ring 1 coordinate is graphite material, has self-lubricating function, compound rotating ring 1 is a long axle sleeve, the place that compound rotating ring 1 and stationary ring 2 coordinate is the cemented carbide material, compound rotating ring 1 links together by the axle of rotating ring "O"-ring 8 with roots blower, compound rotating ring 1 is provided with the piston ring groove, piston ring 5 is installed in the piston ring groove.Having four holes on stationary ring 2 communicates with relief hole 9 on end cap 3.Relief hole 9 is connected with inlet of Roots blower.

Piston ring 5 stops a part of cylinder body internal leakage gas, a small amount of gas continues to leak into ventilation relief hole 9 by piston ring, relief hole 9 is communicated to the blower fan import by reflow pipe, the gas of this part leakage is guided to import, guarantee in cylinder body that on a small quantity the gas that leaks by piston ring packing can the impulse machine seal face, the safe and effective work of assurance mechanical sealing surface.

A kind of roots blower end cap compound sealing device, end cap 3 is the integrated type cast structure, stationary ring 2 is arranged in end cap 3, having four holes on stationary ring 2 communicates with relief hole 9 on end cap 3, stationary ring 2 is by sealing between stationary ring "O"-ring 4 and end cap, compound rotating ring 1 is connected with axle by rotating ring "O"-ring 8, the compound rotating ring 1 outer ring piston ring groove of having got on the bus, ring installation 5 in the piston ring groove, between stationary ring 2 and compound rotating ring 1, oil film is arranged, compress by bearing 6 inner rings, end cap 3 left sides are cylinder bodies, and bearing 6 right sides are fuel tanks 7.

The special gas of carrying in the roots blower cylinder body leaks by a piston ring 5, some arrives compound rotating ring 1 middle groove, and this part gas leaks in relief hole 9 by the hole on stationary ring 2, relief hole 9 is connected with inlet of Roots blower, plays the air venting effect.Prevent that gas from directly impacting dynamic and static ring 2 seal faces, guarantee that sealingly secure is reliable, guarantee that gas 100% is without leaking.

Claims

1. roots blower end cap compound sealing device, it is characterized in that comprising compound rotating ring (1), stationary ring (2), stationary ring "O"-ring (4), rotating ring "O"-ring (8) and relief hole (9), stationary ring (2) is arranged on roots blower end cap (3), have relief hole (9) in the middle of end cap (3), stationary ring (2) front end is by stationary ring "O"-ring (4) and end cap (3) sealing, compound rotating ring (1) is a long axle sleeve, compound rotating ring (1) links together by the axle of rotating ring "O"-ring (8) with roots blower, compound rotating ring (1) is provided with the piston ring groove, piston ring (5) is installed in the piston ring groove.

2. roots blower end cap compound sealing device according to claim 1 is characterized in that having on described stationary ring (2) four holes and communicates with relief hole (9) on end cap (3).

3. roots blower end cap compound sealing device according to claim 1 and 2, is characterized in that described relief hole (9) is connected with inlet of Roots blower.

4. roots blower end cap compound sealing device according to claim 1 and 2, is characterized in that the place that described end cap (3) and compound rotating ring (1) coordinate is graphite material.

5. roots blower end cap compound sealing device according to claim 1 and 2, is characterized in that the place that described compound rotating ring (1) and stationary ring (2) coordinate is the cemented carbide material.

6. a roots blower, is characterized in that the bearing hole leading portion on its end cap (3) is equipped with roots blower end cap compound sealing device as described in one of claim 1 to 5.