JP2003172286A - Ultra-thin pump and cooling system equipped with the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an ultra-thin pump at a low cost in which an ultra-thin structure can be realized and the structure is simple, and to provide a cooling system equipped with this. <P>SOLUTION: The ultra-thin pump is provided with a ring-like impeller in which a large number of blades 2 are formed on an outer periphery and a rotor magnet 3 is provided on an inner periphery; a motor stator 4 provided on an inner peripheral side of the rotor magnet 3; and a pump casing 5 in which a suction port and a delivery port are formed, which accommodates the ring-like impeller 1 at the inside and in which a cylindrical part 7 for disposing it between the motor stator 4 and the rotor magnet 3 is formed. The cylindrical part 7 pivotally supports the ring-like impeller 1. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ultra-thin pump, a cooling system including the same, and the like.

[0002]

2. Description of the Related Art In recent years, a cooling system that efficiently cools electronic parts such as a CPU has been desired, and as a cooling method corresponding thereto, a refrigerant cooling system that circulates and cools a refrigerant has been drawing attention. The coolant circulation pump of such a cooling system is required to be compact in electronic parts themselves, so that many restrictions are imposed on the mounting space.
There is a strong demand for downsizing and thinning.

Hereinafter, a conventional small centrifugal pump is shown in FIG.
The structure will be described with reference to the structure diagram of the conventional small centrifugal pump shown in FIG. 101 is an impeller, 10
2 is a fixed shaft for rotatably supporting the impeller 101, 1
Reference numeral 03 denotes a pump casing that fixes the end portion of the fixed shaft 102, stores the impeller 101, and at the same time has a pump chamber for recovering the pressure of the kinetic energy applied to the fluid by the impeller 101 and guiding it to the discharge port. A rear shroud that forms a part of the impeller 101, a front shroud 105 that also forms a part of the impeller 101 and has a water absorption opening formed in the center of the impeller 101, and 106 is fixed to a rear shroud 104 of the impeller 101. A rotor magnet, 107 is a motor stator provided on the inner peripheral side of the rotor magnet 106, 108 is a waterproof partition wall provided between the rotor magnet 106 and the motor stator 107 for sealing the pump chamber, 109 is a suction port, and 110 is It is a discharge port.

The operation of this conventional centrifugal pump will be described. When electric power is supplied from an external power source, a current controlled by an electric circuit provided in the centrifugal pump flows through a coil of the motor stator 107, and a rotating magnetic field is generated. Occurs. When this 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 by the fixed shaft 102, a rotational torque acts on the impeller 101, and the rotational torque acts on the impeller 101. Starts to rotate. The blade provided between the front shroud 105 and the rear shroud 104 of the impeller 101 is
Rotation causes the fluid to change its momentum, and the suction port 109
The fluid flowing in from receives kinetic energy from the impeller 101. Of course, if the flow passage area is expanded in the impeller 101 toward the blade outlet, the pressure will be partially recovered in the impeller 101. Impeller 10
The fluid flowing out from the blade outlet of No. 1 is pump casing 1
The kinetic energy given by the diffuser provided at 03 is pressure-recovered and is led to the discharge port 110. As described above, in this conventional small-sized centrifugal pump, the thin impeller is driven by the outer rotor system to reduce the size and thickness of the pump.

[0005]

[Patent Document 1] JP 2001-132699 A

[0006]

However, in such a conventional small-sized centrifugal pump, since the pump chamber needs an axial suction portion in order to supply the fluid to the water absorption opening in the center of the impeller, the entire pump is required. There was a limit to the purpose of reducing the length in the direction of the rotation axis, that is, to reduce the thickness.

Further, a vortex flow pump (also referred to as a friction pump or a regenerative pump, hereinafter referred to as a vortex flow pump) suitable for thinning is also provided outside the centrifugal pump with a structure that sucks in in the radial direction and discharges in the radial direction. Is also known,
Even if the pump is a vortex pump, since the impeller is connected to the central fixed shaft, it has a disk shape and a waterproof partition wall is required above and below it to seal the pump chamber. Since the cars overlap, there was a limit to making it thinner.

Therefore, according to the present invention, an ultra-thin structure can be realized,
It is an object of the present invention to provide an ultra-thin pump having a simple structure and low cost.

It is another object of the present invention to provide a cooling system which can reduce the overall structure of the cooling system and realize efficient cooling.

[0010]

In order to solve this problem, an ultra-thin pump of the present invention comprises a ring-shaped impeller having a large number of blades formed on the outer circumference and a rotor magnet provided on the inner circumference. A motor stator provided on the inner circumference side of the rotor magnet, a suction port and a discharge port are formed to accommodate the ring-shaped impeller inside, and a cylindrical portion for disposing between the motor stator and the rotor magnet is formed. And a cylindrical casing rotatably supporting a ring-shaped impeller.

As a result, it is possible to realize an ultra-thin pump, a simple structure, and a low-cost ultra-thin pump.

Further, the cooling system of the present invention comprises a cooler for exchanging heat with the refrigerant to cool the heat generating component, and a radiator for removing heat from the refrigerant, and an ultra-thin system for circulating the refrigerant. A mold pump is provided.

As a result, the structure of the entire cooling system can be made thin, and a cooling system capable of realizing efficient cooling can be provided.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION The invention according to claim 1 of the present invention is a ring-shaped impeller in which a large number of blades are formed on the outer periphery and a rotor magnet is provided on the inner periphery, and on the inner periphery side of the rotor magnet. A motor stator provided, and a pump casing in which a suction port and a discharge port are formed to accommodate a ring-shaped impeller inside and a cylindrical portion for disposing between the motor stator and the rotor magnet are formed. Since the cylinder part is an ultra-thin pump characterized by rotatably supporting a ring-shaped impeller, the blade, rotor magnet, and rotating shaft are integrally formed into a ring shape, and the motor stator is formed in the ring-shaped impeller. By inserting, the length of the entire pump in the direction of the rotation axis can be made as small as possible, and the pump can be made ultra-thin. Also,
By integrating the blade, the rotor magnet, and the rotary shaft, the structure is simple and the cost can be reduced.

The invention according to claim 2 of the present invention is characterized in that a plurality of projections are provided on the inner periphery of the ring-shaped impeller or on the cylindrical portion of the pump casing. Therefore, by receiving the sliding between the inner circumference of the impeller and the cylindrical part of the pump casing due to the rotation of the impeller by the protrusion, the sliding area can be reduced and the friction part can be reduced, so that the pump can be highly efficient and have a long life. Has the effect of becoming.

The invention according to claim 3 of the present invention is characterized in that a thrust plate for receiving a thrust load on the side surface of the ring-shaped impeller is provided in the pump casing.
Alternatively, since it is the ultra-thin pump described in 2, the thrust plate can receive a thrust load, so that the pump can be operated stably even if the thrust load changes due to the load fluctuation of the pump or the installation state of the pump itself. Have.

The invention according to claim 4 of the present invention is the ultra-thin pump according to claim 3, characterized in that a plurality of projections are provided on the side surface of the ring-shaped impeller or on the thrust plate of the pump casing. Therefore, the sliding surface area can be reduced and the friction part can be reduced by receiving the sliding of the side surface of the impeller and the thrust plate of the pump casing due to the rotation of the impeller, and the efficiency of the pump and the longevity of the pump can be extended. Has the effect of becoming.

The invention according to claim 5 of the present invention is characterized in that the thrust magnetic bearing for receiving the thrust load on the side surface of the ring-shaped impeller comprises a rotor magnet and a motor stator. Since it is the ultra-thin pump described in 2, by receiving the thrust load by the magnetic bearing, the side surface of the impeller can be rotated without contact with the pump casing, and the friction portion can be reduced.
It has the effect of further increasing the efficiency and extending the life of the pump.

The invention according to claim 6 of the present invention is characterized in that at least the rotor magnet and the blade of the ring-shaped impeller are integrally formed of a magnetic resin material.
Since it is the ultra-thin pump according to any one of 1 to 5, the impeller is made of a magnetic resin material and the rotor magnet and the vane are integrated, so that the structure is simple and the cost can be reduced, and the magnet part can be realized. Since it can be increased, the motor performance, that is, the pump performance can be improved.

The invention according to claim 7 of the present invention is the ultra-thin pump according to any one of claims 1 to 6, characterized in that the pump is a vortex pump, and therefore the pump has a high lift. By using a vortex pump capable of discharging bubbles with a high capacity, it is possible to secure a required flow rate even in a circulation system having a large line resistance, and it is possible to discharge the bubbles that have flowed in continuously without retaining them.

The invention according to claim 8 of the present invention comprises a cooler for exchanging heat with a refrigerant to cool heat-generating components, and a radiator for removing heat from the refrigerant, for circulating the refrigerant. Since the cooling system is characterized in that the ultra-thin pump according to any one of claims 1 to 7 is provided, it is possible to make the entire system thinner by using the ultra-thin pump. Have an effect.

The invention according to claim 9 of the present invention is the cooling system according to claim 8, which is a cooling system characterized in that it cools electronic components of a small personal computer. By using, it is possible to achieve efficient cooling while achieving a thin product.

The invention according to claim 10 of the present invention is the cooling system according to any one of claims 8 to 9, characterized in that the refrigerant is an antifreeze liquid. Even in cold regions, it has an effect of preventing the cooling system from breaking down due to freezing of the refrigerant.

The invention according to claim 11 of the present invention is the cooling system according to claim 10 characterized in that the antifreeze liquid is a fluorine-based inert liquid, so that the refrigerant is a fluorine-based inert liquid. Therefore, even if the refrigerant leaks, it is possible to prevent the failure of the electronic component.

FIG. 1 shows an embodiment of the present invention.
It will be described with reference to FIG.

(Embodiment 1) FIG. 1 is a sectional view of a side surface of an ultra-thin pump according to Embodiment 1 of the present invention, and FIG. 2 shows an ultra-thin pump according to Embodiment 1 of the present invention from a rotational axis direction. FIG. 3 is an exploded perspective view of the ultrathin pump according to the first embodiment of the present invention.

As shown in FIGS. 1 to 3, reference numeral 1 denotes a ring-shaped impeller having a large number of blades 2 formed on the outer circumference and a rotor magnet 3 provided on the inner circumference. The vane 2 of the first embodiment is the vane of the above-mentioned overcurrent pump, and from this point of view, the pump of the first embodiment can be basically regarded as an ultra-thin overcurrent pump. However, the turbo type is not limited to this. In this specification, a new type of impeller realizes an ultra-thin shape, so this is called an ultra-thin pump. Here, in the ring-shaped impeller 1, the blade 2 and the rotor magnet 3 may be made of different materials and fitted together to be integrated, or may be made of a magnetic resin material so that the blade 2 and the rotor magnet 3 are made of the same material. May be integrated with. Reference numeral 4 denotes a motor stator provided on the inner peripheral side of the rotor magnet 3. Reference numeral 5 denotes a pump casing having a pump chamber for accommodating the ring-shaped impeller 1 and at the same time recovering the kinetic energy applied to the fluid by the ring-shaped impeller 1 to guide it to the discharge port. The casing cover is included to seal the pump chamber after housing the ring-shaped impeller 1. The pump casing 5 is provided between the motor stator 4 and the rotor magnet 3 and has a cylindrical portion 7 for rotatably supporting the ring-shaped impeller 1 and a side surface of the ring-shaped impeller 1. A thrust plate 8 for receiving the thrust load of is formed. The thrust plate 8 is also formed on the casing cover 6 side. Reference numeral 9 is a suction port, and 10 is a discharge port.

Next, the operation of the ultra-thin pump of the first embodiment will be described. When electric power is supplied from an external power source, a current controlled by an electric circuit provided in the ultra-thin pump causes a motor stator. 4 and the rotating magnetic field is generated. When this rotating magnetic field acts on the rotor magnet 3, a physical force is generated in the rotor magnet 3. By the way, since the rotor magnet 3 is integrated with the ring-shaped impeller 1, and the ring-shaped impeller 1 is rotatably supported by the cylindrical portion 7 of the pump casing 5, it is rotated by the ring-shaped impeller 1. A torque acts, and the rotation torque causes the ring-shaped impeller 1 to start rotating. Ring-shaped impeller 1
The blades 2 provided on the outer circumference of the ring-shaped impeller give kinetic energy to the fluid flowing from the suction port 9 by the rotation of the ring-shaped impeller 1, and the kinetic energy gradually increases the pressure of the fluid in the pump casing 5 and discharge port 10. Is exhaled from. Further, the thrust plate 8 can receive the thrust load of the ring-shaped impeller 1 even if the thrust load changes due to the load fluctuation of the pump or the installation state of the pump itself, so that the pump is stably operated.

As described above, according to the present embodiment, the blade 2, the rotor magnet 3, and the rotary shaft are integrated to form the ring-shaped impeller 1, and the cylindrical portion 7 is further provided with the axial support function and the sealless structure. Since it acts as a separating plate of the pump, by inserting the motor stator 4 therein, the length of the entire pump in the direction of the rotation axis can be made as small as possible, and the pump can be made extremely thin. Specifically, the first embodiment
The pump 7 has a thickness of 5 to 10 mm in the rotation axis direction, a representative dimension of 40 to 50 mm in the radial direction, and a rotation speed of 1200 rp.
m, flow rate 0.08 to 0.12 L / min, head 0.3
It is a pump of about 5 to 0.45 m. Further, the specifications of the pump of the present invention include the values of the first embodiment and the thickness of 3
˜15 mm, representative dimension in radial direction 10 to 70 mm, flow rate 0.01 to 0.5 L / min, and head 0.1 to 2 m. In terms of specific speed, this is 24-28 (unit:
m, m ³ / min, rpm), which is a small and thin pump of a size completely isolated from the conventional pumps. Further, by integrating the blade 2, the rotor magnet 3, and the rotary shaft, the structure is simple and the cost can be reduced.

Further, by receiving the thrust load on the thrust plate 8, the pump can be operated stably even if the thrust load changes due to the load fluctuation of the pump and the installation condition of the pump itself. If the thrust magnetic bearing is configured by receiving the thrust load on the side surface of the ring-shaped impeller 1 with the magnetic force between the rotor magnet 3 and the motor stator 4, the thrust load is received by the magnetic bearing. The side surface of the impeller 1 is attached to the thrust plate 8 of the pump casing 5.
Since it can be rotated in a non-contact manner and the friction portion can be reduced, it is possible to further improve the efficiency and the life of the pump.

Further, the ring-shaped impeller 1 is made of a magnetic material and the rotor magnet 3 and the blades 2 are integrated, so that the structure is simple and the cost can be reduced, and the magnet portion can be enlarged, so that the motor performance is improved. That is, the pump performance can be improved. And, by using a vortex flow pump with a high pump head and a high bubble discharge capacity,
The required flow rate can be secured even in a circulation system with a large pipeline resistance, and the inflowing bubbles can be continuously discharged without being retained.

(Second Embodiment) An ultra-thin pump according to the second embodiment of the present invention will be described with reference to FIG. FIG. 4 is an exploded perspective view of the ultra-thin pump according to the second embodiment of the present invention. It is to be noted that components designated by the same reference numerals as those in the first embodiment are the same members, and therefore detailed description thereof will be omitted here, which is given to the first embodiment.

In FIG. 4, 11 is a ring-shaped impeller according to the second embodiment, in which a large number of blades 2 are formed on the outer circumference and a rotor magnet 3 is provided on the inner circumference. And
This ring-shaped impeller 11 has a plurality of inner peripheral projections 12 on the inner periphery.
And a plurality of side surface projections 13 are also provided on both side surfaces. Here, the ring-shaped impeller 11
Is the rotor magnet 3, the blades 2, and the inner peripheral projection 1
2. The side surface projections 13 may be made of different materials and fitted together to be integrated, or may be made of a magnetic resin material and the rotor magnet 3, the blade 2, the inner peripheral projection 12, and the side surface projections 13 may be made of the same material. You may let me. Further, it is desirable that the inner peripheral projections 12 and the side surface projections 13 are made of a material having a small friction coefficient and good wear resistance. Reference numeral 4 is a motor stator, 5 is a pump casing, and 6 is a casing cover for sealing the pump chamber. The pump casing 5 has a cylindrical portion 7 and a thrust plate 8 for receiving a thrust load on the side surface of the ring-shaped impeller 11. The thrust plate 8 is also formed on the casing cover 6 side. Reference numeral 9 is a suction port, and 10 is a discharge port.

Next, the operation of the ultra-thin pump of the second embodiment will be described. When electric power is supplied from an external power source, a current controlled by an electric circuit provided in the ultra-thin pump causes a motor stator. 4 and the rotating magnetic field is generated. When this rotating magnetic field acts on the rotor magnet 3, a physical force is generated in the rotor magnet 3. By the way, since the rotor magnet 3 is integrated with the ring-shaped impeller 11, and the ring-shaped impeller 11 is rotatably supported by the cylindrical portion 7 of the pump casing 5, it is rotated by the ring-shaped impeller 11. Torque acts, and the ring-shaped impeller 11 starts to rotate due to this rotational torque. The blades 2 provided on the outer circumference of the ring-shaped impeller 11 give kinetic energy to the fluid flowing from the suction port 9 by the rotation of the ring-shaped impeller 11, and the kinetic energy gradually increases the pressure of the fluid in the pump casing 5. It is raised and discharged from the discharge port 10.

In the second embodiment, the inner peripheral projection 12 receives sliding friction between the inner circumference of the impeller and the cylindrical portion 7 of the pump casing 5 due to the rotation of the ring-shaped impeller 11. Therefore, the sliding area is small and the friction loss is small. Further, the thrust plate 8 can receive the thrust load of the ring-shaped impeller 11 even if the thrust load changes due to the load fluctuation of the pump or the installation state of the pump itself, so that the pump operates stably. The sliding of the impeller side surface and the thrust plate 8 of the pump casing 5 caused by the rotation of the ring-shaped impeller 11 is received by the side surface projections 13, so that the sliding area is small and the friction loss is small.

As described above, according to the second embodiment, the sliding friction between the inner circumference of the impeller and the cylindrical portion 7 of the pump casing 5 caused by the rotation of the ring-shaped impeller 11 is reduced by the inner circumference projection 12.
Since the sliding area can be reduced and the frictional portion can be reduced by receiving at, the pump can be highly efficient and have a long life.

Further, the sliding of the impeller side surface of the pump casing 5 and the thrust plate 8 of the pump casing 5 caused by the rotation of the ring-shaped impeller 11 is received by the side surface projections 13 so that the sliding area can be reduced and the friction portion can be reduced. It is possible to improve efficiency and extend life.

Next, a cooling system equipped with an ultra-thin pump according to the third embodiment of the present invention will be described with reference to FIG. FIG. 5 is a configuration diagram of a cooling system including an ultra-thin pump according to the third embodiment of the present invention.

In FIG. 5, 21 is a heat-generating component mounted on the substrate 22, 23 is a cooler for exchanging heat between the heat-generating component 21 and the refrigerant to cool the heat-generating component 21, 24 is a radiator for removing heat from the coolant, Reference numeral 25 is a reserve tank for storing the refrigerant, 26 is an ultra-thin pump for circulating the refrigerant, and 27 is a pipe connecting these. The cooling system including the ultra-thin pump according to the third embodiment is for cooling the electronic component which is the heat generating component 21 in the small personal computer. Further, the ultrathin pump 26 in the third embodiment is the ultrathin pump in the first or second embodiment. The pumps of other embodiments may be used as long as they are the ultra-thin pumps of the present invention.

Explaining the operation of the cooling system of the third embodiment, the refrigerant in the reserve tank 25 is discharged from the ultra-thin pump 26, passes through the pipe 27, and the cooler 23.
The temperature of the heat-generating component 21 rises by being deprived of the heat of the heat-generating component 21 and is sent to the radiator 24. Thus, the refrigerant is circulated by the ultra-thin pump 26 to generate heat.
Is for cooling. As a result, electronic components such as small personal computers are cooled and can be used stably.

As described above, according to the third embodiment, it is possible to reduce the thickness of the entire system by using the ultra-thin pump 26 for circulating the refrigerant. Further, if this cooling system is used to cool the electronic components of a small personal computer, efficient cooling can be realized while achieving a thin product. Then, if the refrigerant is an antifreezing liquid, it is possible to prevent the refrigerant from freezing in the cold district and causing a failure of the cooling system. Further, if the antifreeze liquid is a fluorine-based inert liquid, it is possible to prevent the failure of the electronic parts even if the refrigerant leaks.

Since the ultra-thin pump 26 is a swirl pump capable of high lift and high bubble discharge capability, a required flow rate can be secured even in a circulation system having a large line resistance, so that the cooler 23 and the radiator can be secured. Since 24 can be made thin and the pipe 27 can be made small, the cooling system can be made even smaller and thinner. Further, even if air enters the pipe, the bubbles that have flowed into the ultra-thin pump 26 can be continuously discharged to the reserve tank 25 side without accumulating, which may impair the pump performance, that is, the cooling performance. Absent.

[0043]

As described above, according to the present invention, the blade, the rotor magnet, and the rotary shaft are integrally formed into a ring shape, and the motor stator is inserted into the ring, whereby the length of the entire pump in the rotary shaft direction is increased. Can be made as small as possible, and the pump can be made ultra-thin. Further, by integrating the blade, the rotor magnet, and the rotary shaft, the structure is simple and the cost can be reduced.

Further, the sliding friction between the inner circumference of the impeller and the cylindrical portion of the pump casing due to the rotation of the impeller is received by the protrusion, and the sliding area can be reduced to reduce the friction portion, so that the efficiency and the life of the pump can be improved. Can be enabled. Then, by receiving the thrust load by the thrust plate, the pump can be stably operated even if the thrust load changes due to the load fluctuation of the pump or the installation state of the pump itself. In addition, the sliding surface area can be reduced and the friction part can be reduced by receiving the sliding friction between the side surface of the impeller and the thrust plate of the pump casing due to the rotation of the impeller, which can improve the efficiency and the life of the pump. Become. Further, by receiving the thrust load by the magnetic bearing, the side surface of the impeller can be rotated without contact with the pump casing and the friction portion can be reduced, so that the efficiency and the life of the pump can be further improved.

Further, by constructing the impeller with a magnetic resin material and integrating the rotor magnet and the blade, the structure is simple and the cost can be reduced, and the magnet portion can be enlarged, so that the motor performance, that is, the pump performance is improved. The effective effect that it can improve is acquired.

Further, by using a vortex flow pump capable of high lift and high bubble discharge capability, it is possible to secure a required flow rate even in a circulation system having a large line resistance, and to continuously keep the inflowing bubbles from accumulating. Can be discharged to.

Furthermore, by using an ultra-thin pump for circulating the refrigerant, it is possible to make the entire system thinner. And if you cool the electronic components of a small personal computer with a cooling system using an ultra-thin pump,
Efficient cooling can be achieved while achieving a thinner product. Also, by using antifreeze as the cooling system coolant,
Even in cold regions, it is possible to prevent the cooling system from breaking down due to freezing of the refrigerant. Then, by using the fluorine-based inert liquid as the refrigerant of the cooling system, it becomes possible to prevent the failure of the electronic component even if the refrigerant leaks.

[Brief description of drawings]

FIG. 1 is a side sectional view of an ultra-thin pump according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of the ultra-thin pump according to the first embodiment of the present invention as seen from the rotation axis direction.

FIG. 3 is an exploded perspective view of the ultra-thin pump according to the first embodiment of the present invention.

FIG. 4 is an exploded perspective view of an ultra-thin pump according to Embodiment 2 of the present invention.

FIG. 5 is a configuration diagram of a cooling system including an ultra-thin pump according to a third embodiment of the present invention.

FIG. 6 is a structural diagram of a conventional small centrifugal pump.

[Explanation of symbols]

1,11 Ring-shaped impeller 2 feathers 3 rotor magnet 4 motor stator 5 Pump casing 6 casing cover 7 Cylindrical part 8 Thrust plate 9 Suction port 10 outlets 12 Inner peripheral protrusion 13 Side protrusion 21 heat generating parts 22 Substrate 23 Cooler 24 radiator 25 reserve tank 26 Ultra-thin pump 27 piping

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Aizono Jitsumitsu             1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric             Sangyo Co., Ltd.

Claims (12)

[Claims] 1. A ring-shaped impeller having a large number of blades formed on the outer circumference and a rotor magnet provided on the inner circumference, a motor stator provided on the inner circumference side of the rotor magnet, and a suction port and a discharge port. And a pump casing having a cylindrical portion formed therein for accommodating the ring-shaped impeller and arranged between the motor stator and the rotor magnet, wherein the cylindrical portion is the ring-shaped impeller. An ultra-thin pump that is rotatably supported. 2. The pump casing has a thickness in the rotation axis direction of 3 to 15 mm, and a typical radial dimension of 10 to 70 mm.
The ultra-thin pump according to claim 1, wherein 3. The ultra-thin pump according to claim 1, wherein a plurality of protrusions are provided on an inner circumference of the ring-shaped impeller or a cylindrical portion of the pump casing. 4. The ultra-thin pump according to claim 1, wherein a thrust plate that receives a thrust load on the side surface of the ring-shaped impeller is provided in the pump casing. 5. The ultra-thin pump according to claim 4, wherein a plurality of protrusions are provided on a side surface of the ring-shaped impeller or a thrust plate of the pump casing. 6. The thrust magnetic bearing for receiving a thrust load on the side surface of the ring-shaped impeller is composed of the rotor magnet and the motor stator. Ultra-thin pump. 7. The ultra-thin pump according to claim 1, wherein at least the rotor magnet and the blade of the ring-shaped impeller are integrally made of a magnetic resin material. 8. The ultrathin pump according to claim 1, wherein the pump is a vortex pump. 9. A cooler for exchanging heat with a refrigerant to cool a heat-generating component, and a radiator for removing heat from the refrigerant, wherein the refrigerant is circulated. A cooling system comprising the ultra-thin pump described in 1. 10. The cooling system according to claim 9, wherein:
A cooling system that cools electronic components of small personal computers. 11. The cooling system according to claim 9, wherein the refrigerant is an antifreeze liquid. 12. The cooling system according to claim 11, wherein the antifreeze liquid is a fluorine-based inert liquid.