Patent Application
20150136567
The present invention generally relates to internal screw unit, and more particularly to a technical field where a screw blade is fixedly connected to an inside surface of a hollow tubular body in a seamless manner.
In the mechanical engineering field, conveyance devices available for conveying fluids (such as water and oil), solids (such as corn kernels, grains, and plastic particles) or gases are quite numerous, among which the commonly known ones include a belt conveyor for conveying solid objects, a centrifugal pumps for conveying liquids or mixtures of liquids and gases, a conveying device for conveying mixtures of liquids and gases or solid objects. Taking an internal screw conveyance device as an example, as shown in
However, such a known internal screw conveyance suffers the following disadvantages:
(1) During an operation, the tubular body 10 is kept stationary and the screw 30 is put into rotation, so that even there is an inner rubber lining 20 mounted to the inside circumferential surface of the tubular body 10, the enclosure is not complete during the conveyance of a fluid (the conveyed object) so that leaks may result and flow speed and flow rate cannot be kept steady.
(2) During an operation, since the tubular body 10 and the screw 30 are not rotated in unison with each other, solids (the conveyed object), when conveyed, may get jamming between the tubular body 10 and the screw 30, wherein in the worst cases, the power source “b” may get damaged.
(3) After an operation of conveying solids, a jamming object, if not removed, may lead to corrosion and get moldy, leading to contamination to other conveyed objects in the subsequent operations of conveyance. Further, The inner rubber lining 20 is put in abrading contact with the screw 30, generally in a long period of time, and may get chemically deteriorated and release chemical substances that might contaminate the conveyed objects. Further, the long-term abrasion and stress concentration may lead to breaking of the screw 30.
(4) The parts of the inner rubber lining 20 must be additionally provided, which increases the number of parts, and may leads to increased risk of malfunctioning and inconvenience of maintenance.
(5) In a case that the tubular body 10 is made up of several sections jointed to each other, drawbacks of for example power strength of connection and deteriorated tightness of engagement may result.
(6) In cases where the screw 30 must possess both features of a single blade and multiple blades, due to the fact that the tubular body 1 and the screw 30 are not rotated in unison with each other, the multiple blades that bear a relatively greater pressure may get broken and separated. For such a reason, the conventionally used screw 30 is not made in the form including both a single-blade section and a multiple-blade section.
In view of such problems, the present invention aims to provide a device that ensures complete enclosure, improved structural strength, steady flow speed, and extended life span.
For such purposes, the present invention adopts a technical structure that is an internal screw unit, which generally comprises a screw-included tube assembly, to which a power source is coupled. The screw-included tube assembly comprises a hollow tubular body and a screw. The tubular body has an inside surface. The screw has an outer circumferential forming an outer circumferential edge. The power source drives the screw to rotate. The improvement is that the outer circumferential edge of the screw is fixedly connected to the inside surface of the tubular body in a seamless manner so that when the power source drives the screw to rotate, the tubular body is caused to rotate in unison therewith. As such, the drawbacks of the prior art can be improved and the expected purposes can be achieved.
The tubular body is made up of a plurality of tubular sections jointed to each other. The screw is made up of a plurality of screw sections jointed to each other. The screw has a solid screw shaft, or the screw comprises a central bore, or the screw has a tubular screw shaft.
The screw comprises a single screw blade, or the screw comprises a single-blade section and a multiple-blade section, wherein the single blade section comprises a single helical blade and the multiple-blade section comprises at least two parallel helical blades. Further, the power source may be of an operation mode where the power source drives the tubular body to rotate so that the screw can also be driven to rotate in unison therewith.
Thus, the primary object of the present invention is to make an outer circumferential edge of a screw to fixedly connect to an inside surface of a hollow tubular body in a seamless manner so that when being driven by a power source, the screw and the tubular body are rotated in unison with each other to thereby achieve the desired purposes of improving tightness of engagement, improving coupling strength, being hard to get malfunctioning, being hard to damage the power source, and being free of contamination.
The foregoing objectives and summary provide only a brief introduction to the present invention. To fully appreciate these and other objects of the present invention as well as the invention itself, all of which will become apparent to those skilled in the art, the following detailed description of the invention and the claims should be read in conjunction with the accompanying drawings. Throughout the specification and drawings identical reference numerals refer to identical or similar parts.
Many other advantages and features of the present invention will become manifest to those versed in the art upon making reference to the detailed description and the accompanying sheets of drawings in which a preferred structural embodiment incorporating the principles of the present invention is shown by way of illustrative example.
The following descriptions are exemplary embodiments only, and are not intended to limit the scope, applicability or configuration of the invention in any way. Rather, the following description provides a convenient illustration for implementing exemplary embodiments of the invention. Various changes to the described embodiments may be made in the function and arrangement of the elements described without departing from the scope of the invention as set forth in the appended claims.
As shown in
The screw-included tube assembly A comprises a hollow tubular body 1 and a screw 2 (
The power source B is arranged to directly drive the screw 2 to rotate (see
Further, the screw 2 may selectively comprise a solid screw shaft 22 (see
Further, the screw 2 can be a structure made up of a single helical blade 2B (see
Further, the screw-included tube assembly A is applicable to conveyance of fluids (such as water, oil, liquid metal, liquid chemical substances, and the likes) or solids (such as corn kernels, grains, sands/gravels, feeds, tea leaves, plastic particles, and the likes), or can be alternatively used as an internal screw-stirring means for blenders and meat grinder, or, as shown in
Further, the screw-included tube assembly A can be constructed in such a way that the screw 2 is only arranged in a section or a part of the interior of the tubular body 1.
With the above described arrangement and structure, when the present invention is put into practice, a power source B, which can be of any type, is applied to drive the screw 2 to rotate (
(1) In conveying a fluid, since the interior of the screw-included tube assembly A is completely enclosed, no leak will occur and the flow speed and flow rate can maintain steady.
(2) Since the tubular body 1 and the screw 2 are fixed together and are rotatable in unison with each other, no jamming will occur in conveying solids (the conveyed objects), so that the operation of the power source B can be kept normal and the life span can be extended.
(3) The conveyed objects will not be contaminated during the conveyance and breaking of the screw 2 caused by stress concentration is eliminated or alleviated.
(4) The number of separate parts is reduced so that the risk of malfunctioning is reduced and maintenance is easy.
(5) In case that the tubular body 1 is made up of a plurality of tubular sections 1A jointed to each other, since the tubular body 1 and the screw 2 are fixedly connected, the strength of connection is improved and the tightness of engagement is excellent.
(6) The screw 2 can be made in the form of a single-blade section 24 and/or a multiple-blade section 25, wherein the multiple-blade section 25 is capable of bearing a strong pressure without breaking and separation, thus expanding the applications thereof.
It will be understood that each of the elements described above, or two or more together may also find a useful application in other types of methods differing from the type described above.
While certain novel features of this invention have been shown and described and are pointed out in the annexed claim, it is not intended to be limited to the details above, since it will be understood that various omissions, modifications, substitutions and changes in the forms and details of the device illustrated and in its operation can be made by those skilled in the art without departing in any way from the spirit of the present invention.
