CN212636243U - Improved screw device of sealed type - Google Patents

Abstract

The invention provides a sealed improved screw device, wherein a screw is welded and fixed with a mandrel, a first screw sleeve and a second screw sleeve are arranged on the outer edge of the mandrel, and a first sealing groove, a first O-shaped ring, a second sealing groove and a second O-shaped ring are radially arranged at the contact part of the screw and the first screw sleeve; the first threaded sleeve and the second threaded sleeve are fixed with the mandrel through key grooves; first swivel nut with be equipped with the ring pad between the second swivel nut, the ring pad axial is equipped with third seal groove and third O type circle, the ring pad radially is equipped with fourth seal groove and fourth O type circle. The invention has simple and reliable structure, effectively blocks corrosive colloidal particle water from permeating into a gap between the mandrel and the screw sleeve, avoids corrosion and effectively prolongs the service life of the screw.

Description

Improved screw device of sealed type

Technical Field

The invention relates to the field of screw devices of expansion dryers which are main equipment of a post-treatment production line of synthetic rubber in the petrochemical industry, in particular to a sealed improved screw device.

Background

The screw device of the expansion dryer is the core part of the whole machine, the stress condition is complex, the working environment is severe, the screw device is very easy to be broken under the double actions of stress and corrosion, most of the broken parts are in the front side area of the screw sleeve, the reason is that the stress concentration area is simultaneously influenced by corrosive liquid, and the local area, namely the dangerous surface, is cracked to cause the breakage of the mandrel and the screw sleeve, and at present, no better solution is available. If the influence of the key groove must be considered when sealing is carried out, the inner hole of the screw sleeve is small and is a through key groove, and the sealing difficulty is high and difficult to realize. Therefore, a new screw device with simple structure, easy and convenient disassembly and effective corrosion liquid invasion prevention is needed.

Disclosure of Invention

Aiming at the problems that the screw part of the expansion dryer of the main synthetic rubber equipment is difficult to seal in the using process and is fragile and broken due to long-time contact with corrosive liquid, the invention provides a device with a simple and reliable structure for sealing the dangerous surface which is easy to contact with the corrosive liquid, thereby fundamentally avoiding stress corrosion and prolonging the service life of the screw.

In order to achieve the purpose, the technical scheme of the invention is that a screw is welded and fixed with a mandrel, a first threaded sleeve and a second threaded sleeve are arranged on the outer edge of the mandrel, and a first sealing groove, a first O-shaped ring, a second sealing groove and a second O-shaped ring are radially arranged at the contact part of the screw and the first threaded sleeve; the first threaded sleeve and the second threaded sleeve are fixed with the mandrel through key grooves; first swivel nut with be equipped with the ring pad between the second swivel nut, the ring pad axial is equipped with third seal groove and third O type circle, the ring pad radially is equipped with fourth seal groove and fourth O type circle.

Preferably, the ring pad is a metal ring.

Most preferably, the first thread insert, the ring pad and the second thread insert are non-welded structures.

Compared with the prior art, the invention has the following advantages and positive effects: the whole structure is simple, corrosive colloidal particle water is prevented from permeating into a gap between the mandrel and the screw sleeve, and the dual effects of corrosion and stress are avoided, so that the mandrel and the screw sleeve are prevented from early cracking or breaking failure.

Specifically, the beneficial effects are as follows:

1. a first sealing groove, a first O-shaped ring, a second sealing groove and a second O-shaped ring are radially arranged at the contact part of the screw and the first screw sleeve; first swivel nut with be equipped with the ring packing between the second swivel nut, the ring packing axial is equipped with third seal groove and third O type circle, the ring packing radially is equipped with fourth seal groove and fourth O type circle, realizes axial seal and radial seal respectively to do not change original keyway structure, the manufacturability is simple, and sealed effect is excellent.

2. The utility model provides a sealed improved generation screw means, the design have the first swivel nut, the ring pad with the second swivel nut all adopts non-welded structure assembly, and assembly and disassembly and maintenance are convenient, effectively prevent that water and other corrosive liquid from getting into swivel nut dangerous surface, reduce the corruption and take place, improve dabber and swivel nut life.

Drawings

Fig. 1 is an axial sectional view of a seal type modified screw device.

In the drawing, 1 is a cylinder, 2 is a mandrel, 3 is a first nut, 4 is a second nut, 5 is a key groove, 6 is a ring gasket, 7 is a first O-ring, 8 is a second O-ring, 9 is a third O-ring, and 10 is a fourth O-ring.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples.

As shown in fig. 1, in the improved screw device of the sealed type, a screw 1 is welded and fixed with a mandrel 2, a first threaded sleeve 3 and a second threaded sleeve 4 are arranged on the outer edge of the mandrel 2, and a first sealing groove and a first O-ring 7, and a second sealing groove and a second O-ring 8 are radially arranged at the contact position of the screw 1 and the first threaded sleeve 3; the first screw sleeve 3 and the second screw sleeve 4 are fixed with the mandrel 2 through key slots 5; first swivel nut 3 with be equipped with ring pad 6 between the second swivel nut 4, ring pad 6 axial is equipped with third seal groove and third O type circle 9, ring pad 6 radially is equipped with fourth seal groove and fourth O type circle 10. The design of sealing washer, effectively block that there is corrosive micelle water infiltration dabber with first swivel nut 1 with gap between the second swivel nut 3 avoids corruption and stress dual function, the early fracture or the fracture of screw rod that cause, increase of service life.

The ring pad 6 is a metal ring.

The first thread insert 3, the ring pad 6 and the second thread insert 4 are of non-welding structures, and are simple and convenient to mount, dismount and maintain.

Example (b): as shown in fig. 1, in the installation of the improved screw device of the sealing type, the cylinder 1 and the mandrel 2 are first welded and fixed, and the first O-ring 7 and the second O-ring 8 are installed in the corresponding sealing grooves. And installing the third O-shaped ring 9 and the fourth O-shaped ring 10 into corresponding sealing grooves of the ring gasket 6, then sequentially installing the first thread insert 3, the ring gasket 6 and the second thread insert 5, and starting to work after confirming that the installation is stable. After the work is started, the corrosive medium entering the first screw sleeve 3 from the machine barrel is isolated by the first O-ring 7 and the second O-ring 8, so that the part of the mandrel 2 surrounded by the first screw sleeve 3 is not affected by stress corrosion; as the corrosive medium advances, the third O-ring 9 and the fourth O-ring 10 disposed on the upper side of the ring gasket 6 isolate the advancing corrosive medium from contacting the portion of the mandrel 2 surrounded by the second thread insert 4 and from stress corrosion. The whole device is simple, strong in pertinence and low in cost, and the service lives of the mandrel and the thread sleeve are greatly prolonged.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be able to cover the technical solutions and their inventive concepts equally or alternatively within the technical scope of the present invention.

Claims (3)

1. The improved sealed screw device is characterized in that a screw (1) is fixedly welded with a mandrel (2), a first threaded sleeve (3) and a second threaded sleeve (4) are arranged on the outer edge of the mandrel (2), and a first sealing groove, a first O-shaped ring (7), a second sealing groove and a second O-shaped ring (8) are radially arranged at the contact part of the screw (1) and the first threaded sleeve (3); the first threaded sleeve (3) and the second threaded sleeve (4) are fixed with the mandrel (2) through key grooves (5); first swivel nut (3) with be equipped with ring packing (6) between second swivel nut (4), ring packing (6) axial is equipped with third seal groove and third O type circle (9), ring packing (6) radially are equipped with fourth seal groove and fourth O type circle (10).

2. The hermetically sealed improved screw device according to claim 1, characterised in that said ring gasket (6) is a metal ring.

3. The seal-type improved screw device according to claim 1, characterized in that said first threaded sleeve (3), said ring gasket (6) and said second threaded sleeve (4) are of non-welded construction.

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