JP4180853B2 - pump - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pump, and more particularly to a hydraulic pump.
[0002]
[Prior art]
Currently, there are various types of electromechanical pumps used to drive fluids, which electromechanical pumps generally include a chamber having an electromagnetic portion that basically comprises a stator and a rotor, and basically And a separate chamber having a hydraulic part composed of a hydraulic turbine for driving the liquid. However, the electromechanical chamber and the hydraulic chamber must be disconnected from each other to prevent the liquid from reaching the stator and rotor and causing a short circuit and irreparable damage. is there. Therefore, several mechanical devices such as rotating shafts, roller bearings, bearing journals, cooling systems, hydraulic seals, etc. are required to transmit the rotational motion from the rotor to the hydraulic turbine while breaking between chambers. It is said.
[0003]
For example, the roller bearing journal has a function of supporting the rotating shaft of the rotor to which the rotor cage is mounted. When the rotor cage is guided by the magnetic force of the stator, the rotor is rotated with the help of the bearing. To do. Of course, the journal is lubricated with oil or grease to reduce friction and wear between contacting parts.
[0004]
One end of the rotating shaft of the rotor is connected to a hydraulic turbine formed from blades, and this hydraulic turbine starts rotating motion to drive the liquid to be pumped by the induction of the rotor. .
[0005]
In order to prevent the stator and rotor temperatures from reaching undesired temperatures during stator and rotor operation, an external cooling system, usually consisting of a ventilator, is used. In such a cooling system, a propeller is connected to an end of a rotating shaft of a rotor located on the opposite side of the hydraulic pump, generally outside the pump, and the propeller uses the rotation of the rotor to rotate the stator and the rotation. Rotate to cool the child.
[0006]
[Problems to be solved by the invention]
Conventional pumps rely on a physical seal that operates in perfect condition to prevent liquid from flowing from the hydraulic chamber to the electromagnetic chamber. As described above, when the stator and the rotor are in contact with the liquid, short circuit and journal lubrication are reduced, and the rotor may be stopped.
[0007]
Thus, conventional pumps have a tightly sealed chamber in which a rotor disposed and guided to a hydraulic turbine disposed in another liquid passage chamber via a drive shaft is a rotational force. Tell. In this case, these pumps need to have a plurality of sealing mechanisms to prevent damage that would make the pump impractical. In addition, the wear of these sealing mechanisms as a result of their use impairs the mechanical effect of such pumps. Thus, this combination of devices is expensive because it requires expensive parts, complex manufacturing processes, and ongoing maintenance to keep these pumps operational. Has the disadvantage of becoming.
[0008]
From this, the main objective of the present invention is to simplify the construction of conventional pumps by removing physical seals or seals such as gaskets, and external cooling systems such as roller bearings, drive shafts and ventilators. To reduce the chance of damage to the pump. The new pump motor further cools the stator / rotor assembly by circulating the pumped fluid itself as described in patent application PI0004206-4.
[0009]
In addition, it is an object of the present invention to provide a pump that is more compact than conventional pumps and that is easier to manufacture and assemble with fewer components, thereby enabling better automation and reduced costs. Will be able to.
[0010]
Another object of the present invention is to provide a pump that is more effective, i.e., less energy loss.
[0011]
In addition, it is an object of the present invention to provide a pump that is safe, protected and corrosion resistant, which allows it to be immersed and installed in an erosive and uncooled environment.
[0012]
It is a further object of the present invention to provide a pump that has a low noise level and is lubricated by the circulating fluid itself.
[0013]
[Means for Solving the Problems]
The present invention achieves the above object by a pump having a casing. The casing has at least one tightly sealed first chamber and at least one second chamber adjacent to the first chamber. The second chamber includes a fluid passage and has a fluid inlet and outlet. The chambers are preferably separated by walls made of injection-moulded polymeric material.
[0014]
The pump further comprises a stator disposed in the first chamber. In a preferred embodiment, the stator is positioned proximate to the wall separating the first and second chambers so that fluid circulating through the second chamber cools the stator by heat transfer.
[0015]
An integral rotor and turbine assembly is provided generally disposed within the second chamber, and at least a portion of the assembly is disposed coaxially with respect to the stator. This assembly is guided by the stator and drives fluid from the inlet to the outlet. When the pump is activated, at least the fluid film is maintained around the rotor and turbine assembly so that the journal performs a complete rotation with less friction and unnecessary. In the space between the rotor / turbine assembly and the stator, the so-called gap, the walls of the first chamber and the second chamber are substantially arranged, and a fluid film that circulates between the walls of these chambers is provided. It is done.
[0016]
The metal component, called the rotor cage, preferably made of iron and aluminum and guided by the stator, is provided in a tightly sealed rotor and turbine assembly. In a preferred embodiment, such a rotor and turbine assembly is formed from a polymeric material and is additionally perforated to provide a passage for the turbine in the rotor. In a possible embodiment of the present invention, the turbine of the rotor / turbine assembly comprises turbine blades for applying a centrifugal force to the fluid. Thus, in the operation of a possible pump embodiment, after passing through the inlet of the second chamber, the fluid enters the rotor and turbine assembly, passes through the internal passage, and exits after reaching the turbine blade. Driven towards.
[0017]
However, instead of exiting directly through the outlet, some of the fluid circulates around the first chamber and cools the stator by heat transfer. In this way, the drive assembly is cooled by heat exchange between the circulating fluid and the drive assembly (rotor / turbine assembly and stator), eliminating the need for an external cooling system. This ensures that the temperature of the drive assembly is always maintained at a desired level suitable for good operation.
[0018]
In addition, the circulating fluid is used as a lubricant. The circulating fluid film passes between the walls of the second chamber and the rotor / turbine assembly, which allows the rotor / turbine assembly to rotate in a floating state in the second chamber by inductive forces. It becomes like this.
[0019]
As described above, the pump of the present invention is basically composed of the same induction means and motion transmission means as the stator and the rotor, but the ventilation device, the roller bearing, the drive shaft, and the mechanical seal. Therefore, the structure is simple and the manufacturing cost is low.
[0020]
Hereinafter, the present invention will be described in detail with reference to the drawings.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows today's pumps used in the past. The pump includes a coil-shaped stator 4, a rotor 5, and a roller bearing 3 that supports a rotating shaft 9. A cage for the rotor 5 is attached to the rotating shaft 9. The rotating shaft 9 reliably transmits the driving force from the rotor 5 by the induction of the magnetic field of the stator 4. In FIG. 1, there are a ventilator 1 that reliably cools the stator / rotor assembly, and a cover 2 that is disposed on both sides of the rotor 5 and supports the roller bearings.
[0022]
In addition, in order for this type of pump motor to work well, the rotor 5 is positioned completely centrally with respect to the stator 4, thereby preventing contact between these magnets. . In the pump motor shown in FIG. 1, the space between the rotor 5 and the stator 4 called a gap is filled with air.
[0023]
FIG. 1 further shows a physical seal 8. These physical seals 8 are widely used in conventional pump motors so that they can be ventilated and separated between the electrical and hydraulic parts of the pump motor. The hydraulic part consists of a turbine 7 and a vortex chamber 6.
[0024]
On the other hand, FIG. 2 shows a preferred embodiment of the present invention. In FIG. 2, some elements shown in FIG. 1 are omitted. This embodiment shows a pump 10 with a casing 14. The casing 14 has a tightly sealed first chamber 19 and a central second chamber 17, the second chamber 17 comprising at least one inlet 15 and one outlet 16, the inlet 15 and outlet 16 being A passage 18 is defined between the two. The casing 14 is formed from a polymeric material or any other type of material suitable for a particular condition including bad weather.
[0025]
An integral rotor and turbine assembly 11 is disposed in the chamber 17 and drives the fluid passing through the chamber 17. The rotor / turbine assembly 11 is formed from a polymeric material and additionally perforated to define a passage for the turbine in the rotor. In this embodiment, the turbine of the rotor / turbine assembly 11 comprises blades for applying centrifugal force to the fluid. Thus, in operation, fluid flows through the inlet 15 of the chamber 17 and then into the rotor / turbine assembly 11, passes through the internal passage, reaches the turbine blades, and then drives toward the outlet 16. I'm damned.
[0026]
The casing 14 has a first chamber 19 that is tightly sealed from the fluid circulating through the second chamber 17. The outer wall of the casing and the wall separating the second chamber 17 from the first chamber 19 are formed from a polymer material that can be injection molded. In addition, a stator 12, known to those skilled in the art, is provided in the first chamber 19, which is the stator 12 of the rotor / turbine assembly 11 disposed in the second chamber 17 through which fluid circulates. Driving is induced by a magnetic field.
[0027]
In this embodiment of the pump of the present invention, the second chamber further defines a passage separate from the passage leading from the inlet to the outlet, and a portion of the fluid circulates through this chamber. In this embodiment, such a passage circulates fluid around the first chamber 19 and cools the stator 12 disposed in the first chamber 19 by heat transfer.
[0028]
In addition, a small portion of the fluid that enters the inlet 15 and circulates through the second chamber 17 passes through the conduction means 13 between a portion of the wall of the second chamber 17 and the rotor / turbine assembly 11. Thereby, a uniform fluid film is formed. This fluid film allows the rotor and turbine assembly 11 to rotate freely in the liquid without contacting the walls of the second chamber 17 while the pump is operating. In this way, the fluid film acts as a bearing for the rotor / turbine assembly 11 and at the same time as a lubricant that actually eliminates friction between the walls of the second chamber and the rotor / turbine assembly 11. And make the noise level very low. The rotor / turbine assembly 11 is placed in the liquid without contacting the wall of the second chamber 17, but the rotor / turbine assembly 11 is balanced around its axis by the magnetic field generated by the stator 12. Maintained in the same position. In this way, the assembly is prevented from contacting the wall of the second chamber 17 by the magnetic force in the rotational movement.
[0029]
In view of the above, the noise level is reduced because the second chamber 17 has a passage that allows the liquid to circulate. In addition, this eliminates the need for dedicated lubricants and external cooling systems. In addition, the pump is basically made of a polymer material that can be injection-molded, and the number of components is reduced (ie, there is no seal) as compared with the conventional one, so that the assembly is easy and the cost is low. Become. In addition, energy loss is minimized because the friction between the rotor / turbine assembly 11 and the walls of the second chamber 17 is reduced.
[0030]
With regard to another important feature of the present invention, the space between the stator 4 and the rotor 5 of the conventional pump, the so-called gap, was filled with air. On the other hand, in the present invention, in addition to the liquid layer 13, the wall of the second chamber 17 and the wall of the rotor / turbine assembly 11 are made of a polymer material, and the magnetic body of the stator 12 and the rotor / turbine The assembly 11 can be perfectly centered and the rotor / turbine assembly 11 is well balanced around its drive axis. Thereby, contact with the wall of the second chamber 17 is avoided during rotation.
[0031]
In addition, the present invention provides a corrosion-resistant pump because the resin-covered surface is in contact with the fluid. Thus, the fluid moves around without causing any damage to the pump motor. In addition, since the liquid itself is used as a coolant, the pump of the present invention is installed without being ventilated or submerged in the cooling medium.
[0032]
Although an example of a preferred embodiment of the present invention has been described, the scope of the present invention includes other modifications and is limited only by the content of the claims.
[Brief description of the drawings]
FIG. 1 is a cross-sectional side view of a conventional typical pump motor.
FIG. 2 is a cross-sectional side view of an apparatus for driving a liquid of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 11 ... Rotor / turbine assembly 12 ... Stator 14 ... Casing 15 ... Inlet 16 ... Outlet 17 ... First chamber 18 ... Passage

Claims (7)

A casing (14) having at least one tightly sealed first chamber (19) and at least one second chamber (17) adjacent to the first chamber, wherein the second chamber is for fluid use. A casing (14) having an inlet (15) and an outlet (16) for fluid and having a first chamber and a second chamber separated by a wall;
A stator (12) disposed in the first chamber (19);
A rotor / turbine assembly (11) comprising a rotor and a turbine, which can be guided by the stator to drive fluid from the inlet (15) to the outlet (16). A rotor / turbine assembly (11) in which at least a part of the turbine assembly is arranged coaxially with respect to the stator,
The rotor and turbine are integral, and in operation, the fluid film (13) supports the rotor / turbine assembly (11) and the first chamber to support the rotor / turbine assembly (11). (19) and a wall between the second chamber (17) and maintained in the second chamber as a whole, the rotor / turbine assembly has a hole defining an internal fluid passage. A centrifugal hydraulic pump (10) that is opened and the integral rotor / turbine assembly is supported in the pump by the fluid film during operation to perform a rotational motion in a floating state .   2. Centrifugal hydraulic pump (10) according to claim 1, characterized in that the walls of the first chamber (19) and the second chamber (17) are made of an injection moldable polymer material.   3. The rotor / turbine assembly (11) is made of a polymer material and has metallic components therein that can be guided by a stator (12). Centrifugal hydraulic pump (10).   4. Centrifugal hydraulic pump (10) according to claim 3, characterized in that the metallic component is made of iron or aluminum.   The stator (12) is positioned close to the wall separating the first chamber (19) and the second chamber (17) so that the circulating fluid can cool the stator by heat transfer. The centrifugal hydraulic pump (10) according to any one of claims 1 to 4, characterized in that it is arranged.   The centrifugal hydraulic pump (10) according to any one of claims 1 to 5, wherein the turbine of the rotor / turbine assembly comprises a blade for applying a centrifugal force to the fluid.   In the space between the rotor / turbine assembly (11) and the stator (12), walls of a first chamber (19) and a second chamber (17) are substantially disposed. The centrifugal hydraulic pump (10) according to any one of claims 1 to 6.

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