JP2004190562A - Small vortex pump - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a small vortex pump which can be made compact and thin and which has simple construction and can realize low cost. <P>SOLUTION: The small vortex pump comprise an impeller 1 with a number of vanes 2 formed on an upper portion of its outer periphery and with a rotor magnet 3 provided on its inner periphery, a shaft 7 for rotation of the impeller 1, a motor stator 4 provided on an inner periphery side of the rotor magnet 3, and a pump casing 5 that air-tightly partitions the impeller 1 and the motor stator 4 and has an inlet port 9 and a discharge port. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a small eddy pump having a size of about 10 mm, a 10 mm square, a thickness of 5 mm to a 30 mm square and a thickness of about 10 mm for conveying a refrigerant such as an antifreeze or a liquid such as methanol or water.
[0002]
[Prior art]
2. Description of the Related Art In recent years, attention has been paid to a refrigerant-type cooling system that cools electronic components such as a CPU by circulating a refrigerant, and a fuel cell for a small device. In addition, there is an increasing demand for smaller and thinner pumps for circulating a refrigerant and a pump for transporting methanol for a fuel cell in such a cooling system, because the mounting space is often limited.
[0003]
Hereinafter, a conventional small centrifugal pump will be described with reference to FIG. FIG. 4 is a structural view of a conventional small centrifugal pump, 101 is an impeller, 102 is a fixed shaft for rotatably supporting the impeller 101, 103 is a fixed end of the fixed shaft 102, and accommodates the impeller 101. At the same time, a pump casing having a pump chamber for recovering the pressure of the kinetic energy given to the fluid by the impeller 101 and guiding it to the discharge port, 104 is a rear shroud forming a part of the impeller 101, and 105 is the impeller 101 , A front shroud having a water absorption opening formed in the center of the impeller 101, a rotor magnet 106 fixed to a rear shroud 104 of the impeller 101, and a motor 107 provided on the inner peripheral side of the rotor magnet 106. A stator 108 is provided between the rotor magnet 106 and the motor stator 107 to prevent the pump chamber from being sealed. Partition wall, 109 inlet, 110 denotes a discharge port (for example, see Patent Document 1.).
[0004]
The operation of this conventional centrifugal pump will be described. When electric power is supplied from an external power supply, a current controlled by an electric circuit provided in the centrifugal pump flows through the coil of the motor stator 107 to generate a rotating magnetic field. . When the rotating magnetic field acts on the rotor magnet 106, a physical force is generated on the rotor magnet 106. By the way, since the rotor magnet 106 is fixed to the impeller 101 and the impeller 101 is rotatably supported on the fixed shaft 102, a rotational torque acts on the impeller 101, and the rotational torque causes the impeller 101 to rotate. Starts spinning. The blades provided between the front shroud 105 and the rear shroud 104 of the impeller 101 give momentum change to the fluid by the rotation of the impeller 101, and the fluid flowing from the suction port 109 receives kinetic energy from the impeller 101. become. Of course, if the flow path area increases toward the blade outlet in the impeller 101, part of the pressure is recovered in the impeller 101. The fluid flowing out from the blade outlet of the impeller 101 recovers the pressure of the kinetic energy given by the diffuser provided in the casing 103, and is guided to the discharge port 110.
[0005]
As described above, in the conventional small centrifugal pump, the thin impeller is driven by the outer rotor method, thereby reducing the size and thickness of the pump.
[0006]
[Patent Document 1]
JP 2001-132699 A
[Problems to be solved by the invention]
However, in such a conventional small-sized centrifugal pump, an axial suction portion is required in the pump chamber in order to supply the fluid to the water suction opening in the center of the impeller. This is an obstacle to the reduction in thickness.
[0008]
In addition, a vortex pump (also referred to as a friction pump or a regenerative pump; hereinafter, referred to as a vortex pump) suitable for reducing the thickness of a structure that sucks in from the radial direction and discharges the fuel in the radial direction is also known. The impeller is disc-shaped because it is connected to the central fixed shaft. Waterproof partitions for sealing the pump chamber are required above and below the impeller, and the motor stator overlaps the waterproof partition and the impeller in the direction of the rotation axis. There was a limit. Further, since the blades are formed above and below the outer periphery of the impeller, and the pump chamber is formed in the outer periphery thereof, there is a limit to downsizing.
[0009]
Therefore, an object of the present invention is to provide a small vortex pump that can be reduced in size and thickness.
[0010]
[Means for Solving the Problems]
In order to solve this problem, a small vortex pump according to the present invention includes an impeller having a plurality of blades formed on an outer periphery thereof, a rotor magnet provided on an inner periphery, a shaft for supporting the impeller, and the rotor. It is characterized by comprising a motor stator provided on the inner peripheral side of the magnet, a separation plate for airtightly separating the impeller and the motor stator, and a pump casing having a suction port and a discharge port.
[0011]
This makes it possible to reduce the size and thickness of the pump.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
The invention according to claim 1 of the present invention has an impeller in which a number of blades are formed on the outer periphery and a rotor magnet is provided on the inner periphery, a shaft supporting the impeller, and an inner periphery of the rotor magnet. A small-sized vortex pump comprising: a motor stator provided; a separation plate for airtightly separating an impeller and the motor stator; and a pump casing having a suction port and a discharge port. By integrally forming the magnet and inserting the motor stator therein, the length of the entire pump in the rotation axis direction can be reduced as much as possible, and the pump can be made thinner. In addition, since the blades and the pump chamber do not spread in the outer circumferential direction of the rotor magnet, the blades are arranged on the upper side of the outer periphery of the impeller and the rotor magnet is formed in the lower portion thereof. Therefore, the pump can be downsized. Further, by integrating the blades and the rotor magnet, there is an effect that the structure can be simplified and the cost can be reduced.
[0013]
The invention according to claim 2 of the present invention is the small vortex pump according to claim 1, wherein the shaft is fixed to the separation plate or the pump casing, and the impeller rotates around the shaft. Since the shaft is fixed to the separation plate or the pump casing, it has an effect of improving assemblability.
[0014]
The invention according to claim 3 of the present invention is the small vortex pump according to claim 2, wherein the shaft is integrally formed with the separation plate or the pump casing. Can be formed by insert molding or the like, so that not only the effect of improving the assemblability but also the effect of improving the accuracy of the verticality of the shaft is obtained. In addition, since the pump casing can be formed of the same material, the number of parts can be reduced.
[0015]
The invention according to claim 4 of the present invention is the small vortex pump according to claim 1, wherein the shaft is rotatably provided with respect to the impeller, the separation plate, and the pump casing. This has the effect of reducing friction caused by sliding between the shaft and the impeller, thereby enabling higher efficiency and longer life of the pump.
[0016]
The invention according to claim 5 of the present invention is characterized in that the magnetic centers of the rotor magnet and the motor stator are displaced from each other, a thrust component is formed in the magnetic force, and the thrust component receives a thrust load of the impeller. The vortex pump according to any one of claims 1 to 4, wherein the magnetic bearing receives thrust load and pressure in the thrust direction due to vortex generated in the blade, so that the bottom surface of the impeller does not contact the separation plate. And the number of frictional parts can be reduced, so that the pump can have higher efficiency and longer life.
[0017]
The invention according to claim 6 of the present invention is the small whirlpool pump according to any one of claims 1 to 5, wherein the impeller is integrally formed of a magnetic material. By integrating the rotor magnet and the blades by using a magnetic resin material, the structure can be simplified, the cost can be reduced, and the magnet portion can be enlarged, so that the motor performance, that is, the pump performance can be improved.
[0018]
The invention according to claim 7 of the present invention is the small-sized whirlpool pump according to claim 6, wherein a portion near at least the separation plate and the pump casing of the impeller except for the blade is water-repellent. Therefore, the surface tension of the liquid generated between the impeller and the separation plate / pump casing is reduced, so that the starting torque of the pump is reduced and the motor can be downsized.
[0019]
The invention according to claim 8 of the present invention is the small-sized vortex pump according to claim 7, wherein the water-repellent treatment of the impeller is a film formed by fluorine coating. It has the function of uniformly forming a water-repellent film without peeling off the film.
[0020]
According to a ninth aspect of the present invention, there is provided the small whirlpool pump according to any one of the first to sixth aspects, wherein the impeller is integrally formed of a hydrophobic resin material. It has an effect that a water-repellent treatment can be performed during molding.
[0021]
According to a tenth aspect of the present invention, there is provided the small-sized vortex pump according to any one of the first to ninth aspects, wherein the impeller is integrally formed of a material having low friction. It has the effect of reducing the friction caused by sliding with the impeller, and increasing the efficiency and extending the life of the pump.
[0022]
According to the eleventh aspect of the present invention, the pump can be made thinner and smaller, and the structure can be simplified and the cost can be reduced.
[0023]
According to the twelfth aspect of the present invention, since the impeller is made of a hydrophobic resin material, the surface tension of the liquid generated between the impeller, the separation plate, and the pump casing is reduced, and the starting torque of the pump is reduced. And the size of the motor can be reduced.
[0024]
According to the thirteenth aspect of the present invention, since the inside of the small vortex pump is subjected to the water repellent treatment, the surface tension of the liquid generated between the pump and the impeller is reduced, and the starting torque of the pump is reduced to reduce the size of the motor. Becomes possible.
[0025]
According to the fourteenth aspect of the present invention, at least a portion of the impeller other than the blade except for the blade and the pump casing is subjected to a water-repellent treatment, so that the liquid generated between the impeller and the separation plate / pump casing can be removed. The surface tension is reduced, the starting torque of the pump is reduced, and the size of the motor can be reduced.
[0026]
According to the invention of claim 15, since the water-repellent treatment of the impeller is a film made of fluorine coating, a water-repellent film can be uniformly formed with an inexpensive material so that the film does not peel off for a long period of time.
[0027]
Since the impeller has hydrophobicity or water repellency, the surface tension of the liquid generated between the impeller, the separation plate, and the pump casing is reduced, and the starting torque of the pump is reduced. Can be reduced in size.
[0028]
Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
[0029]
(Embodiment 1)
FIG. 1 is a cross-sectional view of a side surface of a small vortex pump according to Embodiment 1 of the present invention, FIG. 2 is a cross-sectional view of the pump when viewed from a rotation axis direction, and FIG. 3 is an exploded perspective view of the pump.
[0030]
As shown in FIGS. 1 to 3, reference numeral 1 denotes an impeller, in which a large number of blades 2 are formed on the outer periphery and a rotor magnet 3 is provided on the inner periphery. Here, the impeller 1 includes the impeller 2 and the rotor magnet 3. May be made of a different material, fitted and integrated, or may be made of a magnetic resin material to integrate the blade 2 and the rotor magnet 3 with the same material. Further, in the impeller 1, at least a portion near a pump casing 5 and a separating plate 6, which will be described later, except for the blade 2, is subjected to a water-repellent treatment by fluorine coating. Here, the impeller 1 may be integrally formed of a hydrophobic resin such as a fluorine-based resin that does not require a water-repellent treatment. Further, carbon is integrally formed in order to reduce friction caused by sliding with the shaft 7 described later. Reference numeral 4 denotes a motor stator provided on the inner peripheral side of the rotor magnet 3. Reference numeral 5 denotes a pump chamber for accommodating the impeller 1 and simultaneously recovering the pressure of the kinetic energy given to the fluid by the impeller 1 and guiding it to the discharge port. A pump casing 6 which is a part of the pump casing 5 and is disposed between the motor stator 4 and the rotor magnet 3 and is provided with a partition 8 provided with a partition 8 for airtight partitioning. Reference numeral 7 denotes a shaft fixed to the pump casing 5, which is inserted into a through hole at the center of the impeller 1 so that the impeller 1 can slide. The shaft 7 may be fixed to the pump casing 5 or the separating plate 6 by press-fitting or insert molding as a separate component, or may be formed by integral molding of the same material as the pump casing 5 or the separating plate 6. Further, the impeller 1, the pump casing 5, and the separation plate 6 may be rotatably slidable with each other. Numeral 9 is a suction port, and 10 is a discharge port. In each case, fluid flows in and out from the radial direction of rotation of the impeller 1. The impeller 1, the pump casing 5, and the separation plate 6 are mainly made of a resin having excellent chemical resistance, such as PPS, particularly methanol resistance.
[0031]
The external size of the small whirlpool pump shown in the first embodiment is 10 mm square to 30 mm square, and the thickness is 5 mm to 10 mm, and transports a refrigerant such as antifreeze and a liquid such as methanol and water. It is used for transporting fuel of a liquid battery, transporting liquid of a liquid cooling device, and the like. The external shape is appropriately selected from shapes such as a square, a circle, and a hexagon depending on the use, the location, and the like.
[0032]
Next, the operation of the small eddy current pump of the first embodiment will be described. When power is supplied from an external power supply, a current controlled by an electric circuit provided in the small eddy current pump flows through the coil of the motor stator 4. , A rotating magnetic field is generated. When the rotating magnetic field acts on the rotor magnet 3, a physical force is generated on the rotor magnet 3. By the way, since the rotor magnet 3 is integrated with the ring impeller 1, a rotational torque acts on the impeller 1, and the rotational torque causes the impeller 1 to start rotating. At this time, since the impeller 1 has been subjected to the water-repellent treatment, the load at the time of starting due to the surface tension with the liquid has been reduced, so that the impeller 1 can be started with a small motor starting torque. The blade 2 provided on the outer peripheral upper side of the impeller 1 gives kinetic energy to the fluid flowing from the suction port 9 by the rotation of the impeller 1, and the kinetic energy gradually increases the pressure of the fluid in the pump casing 5 to discharge the fluid. It is exhaled from the exit 10. At this time, the friction caused by the sliding between the impeller 1 and the shaft 7 is reduced because the impeller 1 is integrally formed with carbon, and the motor efficiency is improved.
[0033]
As described above, according to the present embodiment, the impeller 1 is formed by integrating the blade 2 and the rotor magnet 3, and the motor stator 4 is inserted into the impeller 1, whereby the length of the entire pump in the rotation axis direction is increased. And the pump can be made as thin as possible. Further, a blade 2 is formed on the outer periphery of the impeller 1 and a rotor magnet 3 is formed below the impeller 1. By performing a water-repellent treatment, a motor having a small starting torque can be used. The size of the pump can be reduced without reducing the size. Further, by integrating the blade 2 and the rotor magnet 3, and the pump casing 5 or the separating plate 6 and the shaft 7, respectively, the structure is simple and the cost can be reduced. Then, the magnetic center of the rotor magnet 3 and the motor stator 4 are shifted, a thrust component is formed in the magnetic force, and the thrust component receives a thrust load of the impeller 1 and a thrust direction pressure due to a vortex generated in the blade 2. When the thrust magnetic bearing is configured, the thrust load and the pressure in the thrust direction due to the vortex flow are received by the magnetic bearing, so that the friction due to rotation can be reduced, and the pump can be made more efficient and the service life can be prolonged.
[0034]
Further, by forming the impeller 1 from a magnetic material and integrating the rotor magnet 3 and the blades 2, the structure can be simplified, the cost can be reduced, and the magnet portion can be enlarged, so that the motor performance, that is, the pump performance is improved. Can be improved. And by making the pump a vortex pump having a high head and a high bubble discharge capability, the required flow rate can be secured even in a circulation system having a large pipe resistance, and the inflowing bubbles can be continuously discharged without being retained. .
[0035]
【The invention's effect】
According to the first aspect of the present invention, the length of the entire pump in the rotation axis direction can be made as small as possible by integrally forming the blades and the rotor magnet and inserting the motor stator therein, thereby reducing the thickness of the pump. Becomes possible. In addition, since the blades and the pump chamber do not spread in the outer circumferential direction of the rotor magnet, the blades are arranged on the upper side of the outer periphery of the impeller and the rotor magnet is formed in the lower portion thereof. And the size of the pump can be reduced. Further, by integrating the blade and the rotor magnet, the structure can be simplified and the cost can be reduced.
[0036]
According to the second and third aspects of the present invention, the shaft can be fixed to the separation plate or the pump casing, and the shaft can be formed by insert molding or the like at the time of forming the separation plate or the pump casing. it can. Further, since the separator and the pump casing can be formed of the same material, the number of parts can be reduced, and the assemblability can be improved at low cost.
[0037]
According to the fourth aspect of the invention, friction caused by sliding of the shaft with the impeller, the separation plate, and the pump casing is reduced, the efficiency of the pump is increased, and the life of the pump can be improved.
[0038]
According to the invention described in claim 5, by receiving the thrust load and the thrust direction pressure applied to the blade by the magnetic bearing, the bottom surface of the impeller can be rotated without contacting the separation plate, and the frictional portion can be reduced. Therefore, it is possible to further increase the efficiency of the pump and extend the life thereof.
[0039]
According to the invention as set forth in claim 6, the impeller is made of a magnetic resin material and the rotor magnet and the blade are integrated, so that the structure can be simplified, the cost can be reduced, and the magnet part can be enlarged. The performance, that is, the pump performance can be improved.
[0040]
According to the invention as set forth in claim 7, the portion of the impeller except for at least the blade and the portion close to the pump casing is subjected to the water-repellent treatment, so that the liquid generated between the impeller and the separation plate / pump casing is removed. The surface tension is reduced, the starting torque of the pump is reduced, and the size of the motor can be reduced.
[0041]
According to the eighth aspect of the present invention, since the water-repellent treatment of the impeller is a film made of a fluorine coating, a water-repellent film can be uniformly formed with an inexpensive material so that the film does not peel off for a long period of time.
[0042]
According to the ninth aspect of the present invention, since the impeller is integrally formed of a hydrophobic resin material, a water-repellent treatment can be performed at the time of molding the impeller.
[0043]
According to the tenth aspect of the present invention, since the impeller is integrally formed of a material having low friction, friction caused by sliding between the shaft and the impeller is reduced, so that the efficiency and the life of the pump can be increased. Will be possible.
[0044]
According to the eleventh aspect of the present invention, the pump can be made thinner and smaller, and the structure can be simplified and the cost can be reduced.
[0045]
According to the twelfth aspect of the present invention, since the impeller is made of a hydrophobic resin material, the surface tension of the liquid generated between the impeller, the separation plate, and the pump casing is reduced, and the starting torque of the pump is reduced. And the size of the motor can be reduced.
[0046]
According to the thirteenth aspect of the present invention, since the inside of the small vortex pump is subjected to the water repellent treatment, the surface tension of the liquid generated between the pump and the impeller is reduced, and the starting torque of the pump is reduced to reduce the size of the motor. Becomes possible.
[0047]
According to the fourteenth aspect of the present invention, at least a portion of the impeller other than the blade except for the blade and the pump casing is subjected to a water-repellent treatment, so that the liquid generated between the impeller and the separation plate / pump casing can be removed. The surface tension is reduced, the starting torque of the pump is reduced, and the size of the motor can be reduced.
[0048]
According to the invention of claim 15, since the water-repellent treatment of the impeller is a film made of fluorine coating, a water-repellent film can be uniformly formed with an inexpensive material so that the film does not peel off for a long period of time.
[0049]
According to the sixteenth aspect of the present invention, since the impeller has hydrophobicity or water repellency, the surface tension of the liquid generated between the impeller, the separation plate, and the pump casing is reduced, and the starting torque of the pump is reduced. The size of the motor can be reduced.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a side surface of a small whirlpool pump according to Embodiment 1 of the present invention. FIG. 2 is a cross-sectional view of the pump as viewed from a rotation axis direction. FIG. 3 is an exploded perspective view of the pump. Structure of small centrifugal pump [Description of symbols]
DESCRIPTION OF SYMBOLS 1 Impeller 2 Blade 3 Rotor magnet 4 Motor stator 5 Pump casing 6 Separation plate 7 Axis 8 Partition wall 9 Suction port 10 Discharge port

Claims (16)

An impeller in which a number of blades are formed on the outer periphery and a rotor magnet is provided on the inner periphery, a shaft supporting the impeller, a motor stator provided on the inner periphery of the rotor magnet, and the impeller A small-sized vortex pump, comprising: a separator plate for airtightly separating the motor stator and the motor stator; and a pump casing having a suction port and a discharge port. The small vortex pump according to claim 1, wherein the shaft is fixed to the separation plate or a pump casing, and the impeller rotates around the shaft. The small vortex pump according to claim 2, wherein the shaft is formed integrally with the separation plate or the pump casing. The small vortex pump according to claim 1, wherein the shaft is rotatably provided to each of the impeller, the separation plate, and the pump casing. The magnetic center of each of the rotor magnet and the motor stator is shifted from each other, a thrust component is formed in the magnetic force, and the thrust component receives a thrust load of the impeller. A small eddy current pump according to item 1. The small eddy pump according to any one of claims 1 to 5, wherein the impeller is integrally formed of a magnetic material. The small vortex pump according to claim 6, wherein a portion near at least the separation plate and the pump casing other than at least the blades of the impeller is water-repellent. 8. The small vortex pump according to claim 7, wherein the water repellent treatment of the impeller is a film made of a fluorine coating. The small whirlpool pump according to any one of claims 1 to 6, wherein the impeller is integrally formed of a hydrophobic resin material. The small whirlpool pump according to any one of claims 1 to 9, wherein the impeller is integrally formed of a material having low friction. A number of blades are formed at one end of the outer periphery, an impeller provided with a rotor magnet on the inner periphery, a shaft supporting the impeller, a motor stator provided on the inner periphery of the rotor magnet, A small whirlpool pump comprising: a separation plate for airtightly separating an impeller and the motor stator; and a pump casing having a suction port and a discharge port. An impeller provided with a number of blades and a rotor magnet for flowing a liquid, a shaft supporting the impeller, a motor stator provided facing the rotor magnet, the impeller and the motor stator. A small eddy pump comprising a separator plate for partitioning airtightly and a pump casing having a suction port and a discharge port, wherein the impeller is made of a hydrophobic resin material. An impeller provided with a number of blades and a rotor magnet for flowing a liquid, a shaft supporting the impeller, a motor stator provided facing the rotor magnet, the impeller and the motor stator. A small vortex pump comprising a separator plate for partitioning airtightly and a pump casing having a suction port and a discharge port, wherein the small vortex pump is water-repellent. 14. The small whirlpool pump according to claim 13, wherein at least a portion of the impeller except for at least the blade and near the separation plate and the pump casing is water-repellent. 15. The small vortex pump according to claim 14, wherein the water-repellent treatment of the impeller is a film made of a fluorine coating. An impeller provided with a number of blades and a rotor magnet for flowing a liquid, a shaft supporting the impeller, a motor stator provided facing the rotor magnet, the impeller and the motor stator. What is claimed is: 1. A small eddy pump comprising a separator plate for partitioning airtightly, and a pump casing having a suction port and a discharge port, wherein the impeller has hydrophobicity or water repellency. It is characterized.

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