Agitating – Stationary deflector in flow-through mixing chamber – Plate or block being apertured – notched – or truncated in shape
Reexamination Certificate
2000-03-03
2002-04-30
Cooley, Charles E. (Department: 1723)
Agitating
Stationary deflector in flow-through mixing chamber
Plate or block being apertured, notched, or truncated in shape
Reexamination Certificate
active
06379035
ABSTRACT:
FIELD OF THE INVENTION
This invention relates to improvements in a mixing and stirring device of the static type. Such devices are intended for use primarily in plants for the manufacture of chemicals, medicines, foods, paints, paper, and the like.
BACKGROUND OF THE INVENTION
Static-type mixing and stirring devices, capable of mixing and stirring fluids without using mechanical power, demonstrate such excellent, practical effects as (1) applicability of any possible combinations of fluids, gases, and solids, (2) limited power requirements to compensate pressure loss in the mixing and stirring device, thus achieving substantial energy savings, (3) a simplified noise reducing, trouble-free structure due to no involvement of movable parts, and (4) the possibility of reducing the size of the mixing and stirring device.
FIG. 27
illustrates one example of a prior art mixing and stirring device of the Kenix type which has been put in practice. This static-type, or static, mixing and stirring device is constituted by a 180° right-twisting spiral-shaped mixing element B, the length of which is approximately 1.5 times that of the inner diameter of the case body A, and a 180° left-twisting spiral-shaped element C, designed so that both elements cross each other at a right angle and are fitted into a cylindrical case body A in sequence. Fluids D fed into the case body A in the direction of an arrow are first divided into two by the first left-twisting spiral-shaped mixing elements C1, and further divided into two by the first right-twisting spiral-shaped mixing element B1, and the fluids are lastly divided into S=2
n
(where n is the number of mixing elements), and pushed out of the case body A.
Further, each element B.C is designed so that the right-twisting and the left-twisting are arranged alternately. Therefore, whenever the afore-mentioned divided fluids pass through each element B.C, the flow is inverted at the interface of each element B.C as shown in
FIG. 23
, and advance continuously while converting the flow direction from the center part to the wall part (
FIG. 29
in case of the right-twisting spiral-shaped mixing element B) and wall part to the center part (
FIG. 30
in case of the left-twisting spiral-shaped mixing element C) along the twisted surface of each element B.C. With each element B.C, the flow of fluids D is continuously served by the afore-mentioned actions of division, inversion, and conversion to allow fluids D to be mixed and stirred effectively, thus resulting in lower pressure loss.
As shown in the afore-mentioned
FIG. 27
, the conventional mixing and stirring device of the static type has excellent and practical effects, as discussed above. However, there remain many problems to be solved with the conventional mixing and stirring devices, such as the device illustrated in FIG.
27
. These problems include: (1) how to make it possible to substantially reduce production costs by further simplifying the structure, and (2) how to make it possible to further enhance mixing and stirring capabilities with a structurally simplified and smaller sized device.
The mixing and stirring device in
FIG. 27
employs very complicatedly formed 180° right-twisting spiral-shaped mixing and stirring element B and 180° left-twisting spiral-shaped mixing and stirring element C. Therefore, the manufacture of each element B.C is not an easy task, which makes it difficult to realize the substantial cost reduction in manufacturing the mixing and stirring device.
In addition, there remain some other problems. In order to reduce pressure loss with the mixing and stirring device for smoother mixing, it becomes necessary that the length of each element B.C needs to be approximately 1.5 times longer than the inner diameter of the case body A. Also, in order to improve mixing and stirring performance, it becomes necessary that a large number of elements B.C be employed. Thus it is inevitable that the static-type mixing and stirring device is large in size.
Further, with each element B.C employed in the device in
FIG. 27
, the division number of fluids is limited to 2, and the division number S of fluids becomes S=2
n
(where n is the number of mixing elements). For example, even when 10 pieces of the element B.C are employed, the division number remains only approximately 1·10
3
. As seen in the result, another disadvantage of the device is that, in order to enhance mixing and stirring abilities by increasing the division number S, it becomes inevitable that more numbers of elements B.C are required, thus being unable to avoid the need to make the size of the device larger. Furthermore, because of these disadvantages, the velocity gap between fluids or shearing force will be lowered, and sufficient mixing performance cannot be expected.
The afore-mentioned disadvantages are in regards to the mixing and stirring device of the static type illustrated in FIG.
27
. However, there is no need to say that these disadvantages can also be applied to other conventional mixing and stirring devices of the static type. Sufficient mixing effects cannot be expected with static-type mixing and stirring devices of a simple structure as disclosed by the prior art, and to gain sufficient mixing effects, it becomes structurally complex and costly, and the entire device becomes large in size, and the disadvantages remain unsolved.
SUMMARY OF THE INVENTION
An object of the present invention is to provide solutions to problems with the conventional static-type mixing and stirring devices. Problems addressed by this invention are those mentioned above, such as (1) the structural complexity of elements which form a mixing an stirring device, thus making its manufacture troublesome and the reduction of manufacturing costs difficult, (2) a need to increase the number of elements in use to enhance the mixing and stirring performance, resulting in a large-sized device and increase in pressure loss, and (3) a need to increase the division number for the reason that the division number of fluids per element is small, thus requiring more elements to be used to enhance the mixing and stirring performance, also making the device larger in size and production costs higher.
Another object of the present invention is to provide a mixing and stirring device that permits a simple structure and that reduces production costs considerably, and also enables a large division number S of fluids with a small number of elements in use by increasing the fluid division number S per element, and further enables the entire device to be smaller in size and brings about synergistic effects of shearing force (a velocity gap between fluids) and cavitation (an abrupt pressure gap between fluids), which are necessary to enhance mixing and stirring performance, thus allowing the size of the whole device to be small and providing considerable improvements in its mixing and stirring performance.
The present invention according to a first embodiment comprises fundamentally: a cylindrical case body, multiple kinds of disc-shaped elements which are combined and fitted in sequence into the case body and are provided with multiple holes at prescribed intervals, and joint metals removably fitted at the ends of the outlet and inlet of the case body.
The present invention according to a second embodiment comprises fundamentally the first flange forming a storage cavity at the inner part of the central hole part, the second flange fitted to the afore-mentioned first flange facing each other and forming a storage cavity at the inner part of the central hole part, multiple kinds of disc-shaped elements which are combined and fitted in sequence into the case body and are provided with multiple holes at prescribed intervals, and the fixture to fit and fix both of the afore-mentioned flanges.
The present invention according to a third embodiment comprises fundamentally a valve body equipped with a flow passage arranged so as to move freely inside the valve body, a storage cavity formed inside the flow passage of the afore-mentioned valve, and
Kubo Kenji
Mese Hisayoshi
Saito Shigenohu
Shoji Katsutoshi
Sugino Eizo
Cooley Charles E.
Fujikin Incorporated
Griffin & Szipl, P.C.
Sorkin David
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