CN2539884Y - Diaphragm differential pressure sealing device - Google Patents

Abstract

The utility model discloses a diaphragm type cover pressure seal device which is suitable for the seal of the axle end of the rotating axle. The diaphragm type cover pressure seal device comprises a main body, a diaphragm, an active ring, a static ring and a pressure fluid cavity. The diaphragm, the active ring and the static ring is fixed in turn in the main body. The pressure fluid cavity designed before the diaphragm is communicated through a drill way with the pressure fluid arranged in the cylinder body and leaked. The diaphragm separates the pressure fluid in the pressure fluid cavity from the cavity to prevent the fluid flowing into the cavity. The mating surface of the active ring and static ring is less than the mating surface of the active ring and diaphragm to the pressure caused by the mating surface of the active ring and diaphragm be more than the pressure caused by the mating surface of the active ring and static ring. The active ring moves by pulling and is combined with the static ring to cause the seal end surface, furthermore, and achieve the seal. The utility model has the advantages of simple design structure, convenient fixing and maintenance, low manufacturing cost and long service life. The seal surface after abrasion is able to acquire automatic compensation under the function of pressure difference.

Description

Diaphragm type differential pressure seal arrangement

The utility model relates to a kind of seal arrangement, particularly be the diaphragm type differential pressure seal arrangement of rotatingshaft shaft end seal.

At present, in the known technology of rotatingshaft shaft end seal, particularly centrifugal pump rotatingshaft shaft end seal, the mechanical bellows that is mostly of employing seals.This seal arrangement is made up of elastic bellows assembly, stationary ring, stationary ring seal ring, " O " type circle.The problem that the seal arrangement of this structure exists is: the processing technology complexity, and to install, adjust difficulty, the compensation performance after the wearing and tearing is poor, its sealing load is a variate, and promptly elastic corrugated assembly is long service time one, and the wearing and tearing that end face produces are elongated spring, elastic extenuation, sealing effect descends thereupon.

Goal of the invention of the present utility model provides a kind of diaphragm type differential pressure seal arrangement, and the propagation of pressure realization sealing by fluid replaces original mechanical sealing device, solves the sealing problem of rotatingshaft axle head.

Goal of the invention of the present utility model is achieved in that diaphragm type differential pressure seal arrangement is made up of main body, barrier film, rotating ring, stationary ring, pressurized fluid chamber.Main body is to hold barrier film, rotating ring, pressurized fluid chamber and have certain space assurance barrier film, rotating ring to make axially movable cavity, and the while also is the transfer chamber of hydrodynamic pressure.Have pressurized fluid chamber before the main body inner septum, passing hole channel communicates with the pressure fluid that pump housing internal leakage is housed.Barrier film is a kind of elastic material, is installed in the front of rotating ring in the main body, and barrier film cuts off pressure fluid in the pressurized fluid chamber and cavity, makes pressure fluid can not flow into cavity.Barrier film and rotating ring join, and rotating ring and stationary ring join, and stationary ring makes and is screwed.Rotating ring and stationary ring use as class high-abrasive materials such as pottery, cemented carbide, graphite.Move and the stationary ring formation seal face of combining closely in order to promote rotating ring, pressure fluid does not flow into cavity, the area of contact of its rotating ring of Structural Design Requirement and stationary ring is less than the area of contact of barrier film and rotating ring, can make pressure that the surface of contact of barrier film and rotating ring produces the pressure that surface of contact produced like this greater than rotating ring and stationary ring, utilize the interior pressure fluid of the pump housing propagation of pressure to be given barrier film and promoted rotating ring and do axial motion by pressurized fluid chamber, make rotating ring and the stationary ring formation seal face of combining closely, under the effect of pressure fluid, the seal face that makes barrier film and rotating ring combine back formation with stationary ring can produce the better seal effect.During work, under the effect of pressure,, rotating ring constantly weares and teares, because constantly moving of rotating ring can make sealability be compensated though combining the seal face that forms with stationary ring.

The utility model project organization is simple, and installation and maintenance are convenient, low cost of manufacture, and long service life can be compensated under action of pressure behind the sealing surface wear automatically.

The utility model is described in further detail below in conjunction with the drawings and specific embodiments:

Fig. 1 is the utility model structure sectional view.

The utility model is used for centrifugal pump rotatingshaft shaft end seal, and barrier film 2, rotating ring 3, stationary ring 5 are installed in the main body 1.The following design of surface of contact 10,8 peaces: the pressure of pressurized fluid chamber is P, and the area of surface of contact 10 is S ₁, the area of surface of contact 8 is S ₂, the design principle of the pressure that the pressure that produces according to surface of contact 10 is produced greater than the surface of contact 8 of rotating ring 3 and stationary ring 5 determines that the area of two surface of contact 10,8 should be S ₁＞S ₂With screw 6 stationary ring 5 is fixed on and makes stationary ring 5 on the centrifugal pump rotatingshaft along with rotatingshaft rotates together.Seal ring 4 is used for the sealing of rotating ring 3 and main body 1 and stationary ring 5 and rotatingshaft, duct 12 has been communicated with the pressurized fluid chamber 11 of design before barrier film 2, and the flow process that utilizes pressure fluid 7 passing hole channels 12 of pump internal leakage to flow to pressurized fluid chamber 11 is passed on as pressure.Owing to barrier film 2, rotating ring 3, the stationary ring 5 back sealing effect that can reach of combining closely makes pressure fluid can not flow into cavity 9 can't to leak and realize shaft end seal.

Claims (2)

1, a kind of diaphragm type differential pressure seal arrangement is characterized in that: be made up of main body (1), barrier film (2), rotating ring (3), stationary ring (5), pressurized fluid chamber (11); Barrier film (2), rotating ring (3), stationary ring (5) are installed in the main body (1), barrier film (2) joins with rotating ring (3), rotating ring (3) joins with stationary ring (5), stationary ring (5) uses also can be along with rotatingshaft rotates together on screw (6) fixed bias circuit, pressurized fluid chamber (11) design is preceding at barrier film (2), and the centre has duct (12) to communicate with pump internal pressure fluid (7).

2, diaphragm type differential pressure seal arrangement according to claim 1 is characterized in that: the area of rotating ring (3) and stationary ring (5) surface of contact (8) is less than the area of barrier film (2) with rotating ring (3) surface of contact (10).