U.S. patent application number 12/221771 was filed with the patent office on 2009-03-19 for small ozone gas-water mixing pump.
Invention is credited to Biao Qin.
Application Number | 20090074596 12/221771 |
Document ID | / |
Family ID | 39478605 |
Filed Date | 2009-03-19 |
United States Patent
Application |
20090074596 |
Kind Code |
A1 |
Qin; Biao |
March 19, 2009 |
Small ozone gas-water mixing pump
Abstract
The present invention provides a small ozone gas-water mixing
pump. The rotation of the leaves drives water to produce intense
turbulence vortex, and the bubbles in the water are torn up
producing more and smaller bubbles, so that the gas-water
contacting area is enlarged, and the ozone is efficiently dissolved
into water. The magnetic force between the permanent magnet A on
impeller and the permanent magnet B on motor enables the motor
driving the impeller without using shaft, so as to avoid sealing
problems of the pump driving shaft. The present invention is simple
in structure, low cost, safe, stable, and has high ozone dissolving
efficiency, so that it is especially applicable to the household
appliances, such as dish washers and washing machines, etc.
Inventors: |
Qin; Biao; (Shenzhen,
CN) |
Correspondence
Address: |
DAVID AND RAYMOND PATENT FIRM
108 N. YNEZ AVE., SUITE 128
MONTEREY PARK
CA
91754
US
|
Family ID: |
39478605 |
Appl. No.: |
12/221771 |
Filed: |
August 5, 2008 |
Current U.S.
Class: |
417/420 |
Current CPC
Class: |
B01F 3/04531 20130101;
B01F 13/0827 20130101; B01F 5/16 20130101; F04D 31/00 20130101;
F04D 13/027 20130101 |
Class at
Publication: |
417/420 |
International
Class: |
F04B 17/03 20060101
F04B017/03 |
Foreign Application Data
Date |
Code |
Application Number |
Sep 19, 2007 |
CN |
200710077128.8 |
Claims
1. A ozone-water mixing pump having the motor output power less
than 50 W, comprising a pump casing, an impeller, and a motor,
wherein a permanent magnet A (4) is mounted on the impeller,
outside of the pump casing, at a place corresponding to the
permanent magnet A (4), a permanent magnet B (5) is mounted on a
device connected with the rotor of the motor.
2. The ozone-water mixing pump, as recited in claim 1, wherein the
mixing pump is vortex type.
3. The ozone-water mixing pump, as recited in claim 1, wherein N-S
polar direction of the permanent magnets A and B is the axial
direction of the motor and the impeller.
4. The ozone-water mixing pump, as recited in claim 1, wherein the
adjacent permanent magnets A have opposite magnetic polarity.
5. The ozone-water mixing pump, as recited in claim 1, wherein the
permanent magnets A and B are made of Nd--Fe--B.
6. The ozone-water mixing pump, as recited in claim 1, wherein the
pump casing is made of plastic.
7. The ozone-water mixing pump, as recited in claim 1, wherein the
permanent A (4) is imbedded in the impeller.
Description
BACKGROUND OF THE PRESENT INVENTION
[0001] 1. Field of Invention
[0002] The present invention relates to a gas-water mixing pump,
and more particularly to a small gas-water mixing pump used for
mixing ozone and water, wherein the motor has an output power less
than 50 W.
[0003] 2. Description of Related Arts
[0004] Ozone is an excellent chemical preparation, because it can
instantly kill bacteria and viruses. It can also decompose harmful
chemical pollutant without creating new pollutants. Therefore, the
ozone has been widely applied to large scale water treatment
equipment. The household appliances, such as dish washers and
washing machines have been widely used, and need to be treated by
ozone. However, ozone has not been practically applied to the
household appliances. The main reason that ozone has not been
applied to the household appliances is that small ozone gas-water
mixing equipment, which is efficient, stable and low cost, is not
available yet.
[0005] High ozone concentration in the air is harmful to human
beings. Therefore, the dissolving efficiency of the ozone gas-water
mixing equipment should be high, so as to limit the ozone
concentration to environmental standards. The mixing pump has high
dissolving efficiency, so it is adopted in industry. However,
industrial mixing equipment is not applicable to household
appliances.
SUMMARY OF THE PRESENT INVENTION
[0006] An object of the present invention is to provide a small
ozone gas-water mixing pump (having a motor output power less than
50 W), which is applicable to the household appliances, such as
dish washers and washing machines, etc.
[0007] Another object of the present invention is to provide a
small ozone gas-water mixing pump (having a motor output power less
than 50 W), which is highly efficient, stable, reliable, small in
size, and low cost.
[0008] The principle of the present invention is that the rotation
of the leaves of the water pump produces intense turbulence vortex,
and the bubbles in the water are torn up to produce more and
smaller bubbles, so that the ozone is efficiently mixed with and
dissolved into water. Accordingly, in order to accomplish the above
object, the present invention provides a pump casing, an impeller,
and a motor. A permanent magnet A is provided on the impeller.
Outside of the pump casing, at a place corresponding to the
permanent magnet A, a permanent magnet B is mounted on a device
connected to the rotor of the motor, like a rotary plate connected
with or integrated with the rotor. The motor drives the permanent
magnet B to rotate. According to the character of magnetic poles,
that is unlike poles attract and like poles repel, the permanent
magnet B pushes the permanent magnet A to rotate through magnetic
force, so as to drive the impeller to rotate synchronously. Thus,
the motor drives impeller without shafting.
[0009] Ozone is strong oxidant, which can accelerate the aging of
the sealing rubber, so that using rubber gasket to seal driving
shaft for a water pump is not reliable, especially when there is
ozone in water, and this problem has been existed for a long time.
The ceramic seal ring widely adopted by the present water pump is
more reliable than the rubber gasket, but has a complicated
structure, costs a lot, and takes up more room; besides, it still
partially uses rubber gasket. For tiny or small pump, shaft sealing
produces higher frictional resistance, which consumes a large part
of the motor output power. The frictional resistance of the same
kind of product cannot be assured to be the same. In this case, the
output power of the water pump of the same kind of product
significantly varies. Therefore, for household appliance, the water
pump with a driving shaft cannot be adopted.
[0010] The present invention uses magnetic force to drive impeller
without using a driving shaft, so that the driving shaft sealing
problems is avoided, and the maintenance work is easier. The
driving structure using magnetic force is simple in structure. If
the brushless DC motor is adopted, the permanent magnet B is
mounted on the rotary plate of the motor rotor. This structure is
safe, simple, and small, so as to be applied to the tiny or small
pumps. Without using shaft, the coaxial precision demand between
the impeller and the motor shaft is lowered, and the motor and the
pump body is easily maintained and replaced. If the impeller is
trapped or overloaded, the motor will not be trapped or overloaded,
so as to avoid the burning damage of the motor.
[0011] These and other objectives, features, and advantages of the
present invention will become apparent in the following detailed
description, the accompanying drawings, and the appended
claims.
BRIEF DESCRIPTION OF THE DRAWINGS
[0012] FIG. 1 is a schematic view of a centrifugal type mixing pump
according to the preferred embodiment of the present invention.
[0013] FIG. 2 is a schematic view of a vortex type mixing pump
according to the above preferred embodiment of the present
invention.
[0014] FIG. 3 is a schematic view of a vortex type mixing pump
according to the above preferred embodiment of the present
invention, illustrating the ozone conduit and the water flowing
direction.
[0015] FIG. 4 is a schematic view of a vortex type mixing pump
according to the above preferred embodiment of the present
invention, illustrating an application of a brushless DC motor.
[0016] FIG. 5 is a side sectional view of a vortex type mixing pump
according to the above preferred embodiment of the present
invention.
[0017] FIG. 6 is a top sectional view at plane A-A of a vortex type
mixing pump according to the above preferred embodiment of the
present invention.
[0018] FIG. 7 is a side sectional view of a vortex type mixing pump
having only one water channel according to the above preferred
embodiment of the present invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
[0019] Referring to FIG. 1 of the drawings, a structure of a
centrifugal type mixing pump according to a preferred embodiment of
the present invention is illustrated. A water inlet is provided on
the central axis of the mixing pump. Leaves 3 are provided on the
surface of an impeller 2. A permanent magnet A (4) is provided on
an outer circle portion of the impeller 2. Outside of the pump
casing 1, at a place corresponding to the permanent magnet A (4), a
permanent magnet B (5) is mounted on a device coaxially connected
with the motor 6, such as a rotary plate. The motor 6 drives the
permanent magnet B (5) to rotate, and the permanent magnet B (5)
impulses the permanent magnet A (4), so as to drive the impeller 2
to rotate synchronously. The rotating leaf 3 drives water to
rotate, produces centrifugal force, and increases the pressure and
moving speed of the water. The speedy leaves 3 interact with the
stationary pump casing 1 to produce an intense turbulent vortex.
The bubbles in the water are torn up to produce more and smaller
bubbles, so that larger gas-water contacting area is obtained so as
to increase the ozone dissolving efficiency. When the turbulent
vortex is more intense, the force to tear the bubble in the water
is stronger, so that the bubbles in the water are smaller and the
ozone dissolves more efficiently.
[0020] The mixing pump shown in FIG. 2, FIG. 3, and FIG. 4 is a
vortex mixing pump. As shown in FIG. 3, the leaves 3 are provided
on an outer circle portion of the impeller 2, and the water inlet
is provided on an outer circle of the mixing pump. The leaves 3 are
provided on an outer circle portion of the impeller 2, and form a
radiating shape. The rotation of the impeller 2 drives the leaves 3
to move around so as to propel the water to speed up, so that
kinetic and potential energy (pressure) of water is constantly
increasing. A vortex mixing pump produces more intense turbulence
vortex than a centrifugal mixing pump. Although it has lower
converting efficiency from the mechanical energy of the impeller to
the kinetic energy and pressure potential energy of the water;
because the vortex mixing pump has more intense turbulence vortex
than the centrifugal mixing pump, and the vortex mixing pump has a
higher gas-water dissolving efficiency than that of the centrifugal
mixing pump. Therefore, the vortex mixing pump is a better choice
to be used in the gas-water mixing pump.
[0021] The ozone gas can be added into the water before infusing
into the mixing pump (premixing), or the ozone conduit 8 can be
inserted into the mixing pump directly. Usually the inserting
position is at the water inlet, as shown in FIG. 3. The permanent
magnets A and B are positioned as near as possible to the outer
edge to increase a diameter thereof, so that the moment arm of the
permanent magnets A and B are increased, so when the torsion
remains, the magnetic driving force can be reduced, which is shown
in FIGS. 1, 2, 3 and 4. As shown in FIGS. 1 and 2, a rotor in the
motor 6 is connected to the device for fastening the permanent
magnet B 5 via a shaft to drive the permanent magnet B 5. The motor
shown in FIG. 4 is a brushless DC motor. The rotor of the motor 6
is an annular magnet, and the stator with a winded coil is disposed
inside the annular rotor. The rotor is connected to central shaft
via a rotary plate, and the permanent magnet B 5 is mounted on the
rotary plate. Such a structure is simple and compact. The brushless
DC motor has high efficiency and long lifespan, and is safe and
reliable, so as to be a great choice for household appliance.
[0022] In order to make the most of the attraction between the
permanent magnets A and B, and produce effective moment to drive
impeller to rotate, the N-S polar direction of the permanent
magnets A and B is the direction of the axis of the motor and the
impeller, as shown in FIG. 4. Comparing with other arrangements,
the magnetic line of force between the permanent magnets A and B is
the shortest, and the attraction between the permanent magnets A
and B is the strongest. When the permanent magnet B drives the
permanent magnet A to rotate, due to the loading effect of the
impeller, the permanent magnets A and B are dislocated; due to the
fact that like poles repel while unlike poles attract, the adjacent
permanent magnets A on the impeller 2 are arranged to have opposite
polarity, as shown in FIG. 3. The corresponding two permanent
magnets A and B have opposite polarity, so as to attract each
other; the permanent magnet B and the permanent magnet A that are
adjacent to the corresponding permanent magnet A therewith have
same polarity, so as to repel each other. Because of the
dislocation between the corresponding two permanent magnets A and
B, the permanent magnet B has acting force with two adjacent
permanent magnets A, wherein one is attraction, and the other is
repellence, so that the magnetic force is fully taken.
[0023] There are a variety of permanent magnets. The Nd--Fe--B is
the best in terms of cost and magnetic intensity. Therefore, in the
present invention, Nd--Fe--B is the first choice. The rotation of
the permanent magnets A and B produce alternating magnetic field,
especially between the permanent magnets A and the permanent
magnets B. If the pump casing is made of metal, the alternating
magnetic field produces electric eddy current, which has two major
disadvantages. Firstly, electromagnetic field lowers the magnetic
driving force between the permanent magnets A and B. Secondly, the
electric eddy current produces heat and increases the load of the
motor. Therefore, the pump casing, especially between the permanent
magnets A and B, should be made of non-conductive and non-metal
material. Plastic is easily shaped, low cost, and is capable of
resisting oxidization and corrosion, so that the plastic completely
meets the demand of the household appliance. In the present
invention, plastic pump casing is the first choice.
[0024] Referring to FIG. 5 and FIG. 6, a vortex type of mixing pump
of the present invention is illustrated. The motor is a brushless
DC motor including a stator 14, a rotor 12, a motor shaft 13, and a
rotary plate 11. The rotor 12 is firmly connected to the motor
shaft 13 via rotary plate 11. The permanent magnet B is partially
imbedded in the rotary plate 11. The pump casing 1 and the pump
cover 15 are sealed by a sealing gasket 17. The permanent magnet A
(4) is entirely imbedded in the impeller 2, so as to be separated
from water, because the permanent magnet, usually made of iron-base
material, easily gets rusty when contacting with water, especially
ozone water. As shown in FIG. 6, the ozone gas enters into
Venturi-tube 18 through ozone conduit 8. The ozone gas is premixed
into water through Venturi-tube 18, before infusing into the mixing
pump. Only through the intense turbulent vortex produced by the
impeller of the mixing pump, can the big bubbles transform into
many tiny bubbles, which helps the ozone dissolve into water.
[0025] The vortex type of mixing pump shown in FIG. 7 is similar to
the mixing pump shown in FIG. 5. The major difference is that there
are two water channels at both sides of the impeller 2, as shown in
FIG. 5, and there is only one water channel at left side of the
impeller. The objective of such design is to dispose the permanent
magnet A (4) more closely to the outer circle of the impeller 2, so
as to increase the magnetic driving torsion.
[0026] One skilled in the art will understand that the embodiment
of the present invention as shown in the drawings and described
above is exemplary only and not intended to be limiting.
[0027] It will thus be seen that the objects of the present
invention have been fully and effectively achieved. It embodiments
have been shown and described for the purposes of illustrating the
functional and structural principles of the present invention and
is subject to change without departure from such principles.
Therefore, this invention includes all modifications encompassed
within the spirit and scope of the following claims.
* * * * *