AU2006100039B4

AU2006100039B4 - Aeration device

Info

Publication number: AU2006100039B4
Application number: AU2006100039A
Authority: AU
Inventors: Shusen Yu
Original assignee: Individual
Current assignee: Individual
Priority date: 2005-10-19
Filing date: 2006-01-17
Publication date: 2006-07-06
Anticipated expiration: 2014-01-17
Also published as: CN2825632Y; AU2006100039A4

Description

AUSTRALIA

Patents Act 1990 COMPLETE SPECIFICATION INNOVATION PATENT Applicant(s): Shusen Yu Yuan Yu Jian Yu Invention Title: AERATION DEVICE The following statement is a full description of this invention, including the best method of performing it known to us: -2- AERATION DEVICE Technical Field This invention relates to a device that facilitates a mixture of air and liquid, and it is especially a selfabsorptive low pressure aeration device for sewage disposal.

Background of the Invention Today, people mainly adopt the aerobic method for sewage disposal of urban living sewage and industrial organic sewage. The aeration equipment is mainly blowing aeration devices and mechanical aeration devices. Blowing aeration works in such a way that the aeration device scatters the air from blowing into the water and part of the oxygen in the rising air bubble is dissolved into the water. The aeration device is also the key to biochemical sewage disposal, the quality, efficiency and cost of this sewage disposal is subject to the aeration device. The current aeration devices have a low utilization ration of oxygen, less than 15% (mostly 6-13%) due to the low transferring ratio of oxygen.

Current effluxing aeration devices of the kind shown in Figure 1 have a negative pressure tank 5 with a shell 2. The left of the shell is connected air tight to a conical pressure pipe 3 with a big end outside and a small end inside. The right of the shell 2 is connected to a conical moisture pipe 4 with a small end inside and a big end outside. On the top of the shell 2 is an air inhaling pipe 1. The conical pressure pipe 3 and the inside header face of the conical moisture pipe 4 are about 3 millimetres away from each other. The oxygen utilization ratio of this device is as high as 20-30%, but the motive power efficiency is low and the working pressure is high H\melindaf\keep\Speci'G\p59217 AERATION DEVICE.doc 16/01/06 3 and the overall efficiency is low. Thus, the cost of sewage disposal is high and it is mostly used in small scale sewage disposal projects.

The purpose of this invention is to propose a selfabsorptive low pressure aeration device with a highly improved oxygen utility ratio which is applicable to large scale and small scale sewage disposal projects.

Summary of the Invention In accordance with the present invention there is provided an aeration device comprising: a shell hermetically sealed at one end to the larger end of a conical pressure pipe and at the other end to the larger end of a conical moisture pipe, and having an air inlet; the smaller end of the pressure pipe extending into the smaller end of the moisture pipe to define an interstitial coupling at the conjuncture; whereby the smaller ends overlap by between 1-6 millimetres; and the annular gap between the overlapping ends of the pipes is between 3-7 millimetres.

Description of the Drawings An embodiment of the invention will now be described by way of example only with reference to the accompanying drawings in which: Figure 1 is a schematic illustration of a known aeration device; and Figure 2 is a schematic illustration of an aeration device in accordance with the present invention.

4 Description of the Preferred Embodiment As shown in Figure 2 the aeration device 10 comprises a cylindrical shell 2 closed at either end by coupling flanges 11, 12 with an inhaling pipe 1 at the top of the device. The left end of the shell is connected air tight to the conical pressure pipe 3 with a big end 13 outside and a small end 14 inside, and the right end of the shell is connected air tight to a conical moisture pipe 4 with a small end 15 inside and a big end 16 outside. The method of ensuring air tight seals by welding the flanges 11, 12 to the tank body 2. The inner end of the conical pressure pipe 3 extends into the inside of the conical moisture pipe 4 and the length of overlap is L=1-6 millimetres, the conjuncture of the two pipes defining an interstitial coupling with an annular gap having a radial dimension of H=3-7 millimetres. The interior of the shell 2 defines the air tank The length of extending and the size of the interstice are subject to the working burden of the self absorptive low pressure aeration device. Normally the ratio between the length of effluxing shell and its diameter is 8-10, and the length of the conical pressure pipe is 56% of the total length of the effluxer, and the length of the conical moisture pipe is 44% of the total length of the effluxer, the effluxing inhaler is 50% of the diameter of the effluxer and is placed at 2/3 along the length of the conical pressure pipe 3.

When the traditional effluxing aeration device of Figure 1 is working, the working liquid pushes through the conical pressure pipe, touches and mixes with the air coming from the inhaler after overcoming the air hindrance, and then after it atomizes, the working liquid takes the air away, thus leaving the air tank and conical moisture pipe in a negative pressure state.

4a The aeration device of Figure 2 breaks through the design principles and structures of the traditional effluxing aeration device, extending the inner end of the conical pressure pipe into the inner end of the conical moisture pipe and the conjuncture of the two pipes is 5 interstitial connection. The extending length and the size of the interstice are subject to the size of the aeration device. In this example, the air tank only functions as a storage of air, the working liquid with pressure touches and mixes sufficiently with the air inside the conical moisture pipe, and then after it atomizes, the working liquid takes the air away, thus leaving the conical moisture pipe in a negative pressure state, the air automatically goes into the conical moisture pipe through the interstice and constantly mixes with the working liquid, atomizes and scatters.

The difference between this device and the traditional effluxing aeration devices is that there is a longer line for the mixture of air and water. In the traditional effluxing aeration devices, the mixture of air and water mainly happens in the conjuncture of the two pipes, but in this device, the air goes directly into the conical moisture pipe and mixes sufficiently with the working liquid. And since the size of the conical moisture pipe is outstandingly smaller than the air tank, under the same working pressure, the formed negative pressure in this invention is greatly larger than the traditional air tank. Furthermore, the conical pipe with a smaller inner end a bigger outside end is very suitable to the scattering of the mixture of air and water. This device can reduce the working pressure from 2.5-3kg/cm 2 to 1.5-2kg/cm 2 improving nearly double the motive efficiency.

And oxygen transferring and utilization ratio is improved from 20-30% tO 30-50%. The total efficiency is improved and the energy consumption is reduced.

This device is original in conception and proper in design, yet the working function is safe and reliable and it is convenient to manufacture and use. It may be used in many kinds of sewage disposal projects. Since the total efficiency is largely improved, the cost of the H:\melindaf\keep\Speci's\p59217 AERATION DEVICE.doc 16/01/06 6 sewage disposal is largely reduced and energy is saved.

This device can be widely used in the big and middle-scale sewage disposal projects.

In the claims which follow and in the preceding description of the invention, except where the context requires otherwise due to express language or necessary implication, the word "comprise" or variations such as "comprises" or "comprising" is used in an inclusive sense, i.e. to specify the presence of the stated features but not to preclude the presence or addition of further features in various embodiments of the invention.

H.\melindaf\keep\Speci's\p59217 AERATION DEVICE.doc 16/01/06

Claims

1. An aeration device comprising: a shell hermetically sealed at one end to the larger end of a conical pressure pipe and at the other end to the larger end of a conical moisture pipe, and having an air inlet; the smaller end of the pressure pipe extending into the smaller end of the moisture pipe to define an interstitial coupling at the conjuncture; whereby the smaller ends overlap by between 1-6 millimetres; and the annular gap between the overlapping ends of the pipes is between 3-7 millimetres. Dated this 19th day of June 2006 SHUSEN YU JIAN YU YUAN YU By their Patent Attorneys GRIFFITH HACK Fellows Institute of Patent and Trade Mark Attorneys of Australia