JP2003139086A - Ultra-thin pump - Google Patents

Abstract

(57) [Problem] An object of the present invention is to provide an ultra-thin pump that can achieve high performance, long life, and low noise while achieving ultra-thinness. SOLUTION: The ultra-thin pump of the present invention has a ring-shaped impeller 1 having a large number of blades formed on the outer circumference and a rotor magnet provided on the inner circumference, and a motor stator 4 provided on the inner circumference side of the rotor magnet. And a pump casing 5 having a suction port and a discharge port formed therein, accommodating the ring-shaped impeller 1 therein, and having a cylindrical portion provided between the motor stator 4 and the rotor magnet. Has the thrust dynamic pressure generating groove 12 provided on a thrust plate provided rotatably supporting the ring-shaped impeller 1 and opposed to both side surfaces of the ring-shaped impeller 1 or both side surfaces of the pump casing. It is characterized by.

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 having high performance, long life, low vibration and low noise.

[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. Since the refrigerant circulation pump of such a cooling system is required to be compact in electronic parts, many restrictions are imposed on the mounting space, and there is a strong demand for reduction in size and thickness.

As a conventional small pump, Japanese Patent Laid-Open No. 2001-2001
There is a small centrifugal pump proposed by the present applicant, which is described in Japanese Patent No. 132699. Hereinafter, this conventional small centrifugal pump will be described with reference to FIG. FIG. 7 is a structural diagram of a conventional small centrifugal pump. 101 is an impeller, 102
Is a fixed shaft for rotatably supporting the impeller 101, 10
Reference numeral 3 denotes a pump casing which 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 which forms a part of the impeller 101, a front shroud 105 which also forms a part of the impeller 101 and has a water absorption opening formed in the center of the impeller 101, and 106 a rear shroud 1 of the impeller 101.
The rotor magnet fixed to 04, 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, and 109 is The suction port and 110 are discharge ports.

The operation of this conventional small 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 small 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, this rotor magnet 106 is used for the impeller 101.
Since the impeller 101 is rotatably supported by the fixed shaft 102, rotational torque acts on the impeller 101, and the impeller 101 starts rotating due to this rotational torque. The blades provided between the front shroud 105 and the rear shroud 104 of the impeller 101 are
01 rotation gives a change in momentum to the fluid, and suction port 1
The fluid flowing in from 09 gives kinetic energy to the impeller 101.
You will receive it from 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. The fluid flowing out from the blade outlet of the impeller 101 is the casing 10
The kinetic energy given by the diffuser provided at 3 is pressure-recovered and is led to the discharge port 110. As described above, in the conventional small centrifugal pump, by driving the thin impeller by the outer rotor system, the pump is made smaller and thinner.

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 at the center of the impeller, so that the length of the entire pump in the rotation axis direction is increased. The purpose of reducing the size, that is,
There was a limit to thinning.

A vortex pump (also referred to as a friction pump or a regenerative pump; hereinafter referred to as an eddy pump) suitable for thinning the structure that sucks in the radial direction and discharges in the radial direction is also known. Even if a pump is used, the impeller is connected to the central fixed shaft and has a disk shape, and a waterproof partition wall for sealing the pump chamber is required above and below the impeller, and the motor stator and the waterproof partition wall and the impeller overlap in the rotation axis direction. Therefore, there is a limit to making the device thinner.

Therefore, in order to improve such a problem, the present applicant has proposed the following pump prior to the present invention. Hereinafter, the ultra-thin pump proposed by the applicant will be described in detail with reference to the drawings. FIG. 8 is a sectional view showing the overall structure of a conventional ultra-thin pump.

A ring-shaped impeller 201 is provided with a large number of blades 202 formed on the outer circumference and a rotor magnet 203 provided on the inner circumference. The blades 202 of this ultra-thin pump are the blades of the vortex pump described above, and from this point of view, this pump can basically be called an ultra-thin vortex pump. However, the turbo type is not limited to this. In this specification, since a new type of impeller achieves an unprecedented ultra-thinness,
This is called an ultra-thin pump. Reference numeral 204 denotes a motor stator provided on the inner peripheral side of the rotor magnet 203,
Reference numeral 05 denotes a pump casing that houses the ring-shaped impeller 201 and has a pump chamber for recovering the pressure of the kinetic energy applied to the fluid by the ring-shaped impeller 201 and guiding it to the discharge port. 206 includes the pump casing 205. ,
It is a casing cover for sealing the pump chamber after housing the ring-shaped impeller 201. Pump casing 20
5, a cylindrical portion 207 is provided between the motor stator 204 and the rotor magnet 203 to rotatably support the ring-shaped impeller 201, and the thrust on the side surface of the ring-shaped impeller 201 is formed. A thrust plate 208 for receiving a load is formed. The thrust plate 208 is also formed on the casing cover 206 side. Reference numeral 209 is a suction port, and 210 is a discharge port.

Next, the operation of the previously proposed ultra-thin pump 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 produces a motor stator. It flows in the coil of 204, and a rotating magnetic field is generated. When this rotating magnetic field acts on the rotor magnet 203, a physical force is generated in the rotor magnet 203. By the way, this rotor magnet 203
Is integrated with the ring-shaped impeller 201, and the ring-shaped impeller 201 is a cylindrical portion 207 of the pump casing 205.
Since it is rotatably supported by the ring-shaped impeller 20,
A rotating torque acts on the ring-shaped impeller 201 and the ring-shaped impeller 201 starts to rotate. Ring-shaped impeller 201
The blades 202 provided on the outer periphery of the ring-shaped impeller 201
Rotatively imparts kinetic energy to the fluid flowing in through the suction port 209, and the kinetic energy gradually increases the pressure of the fluid in the pump casing 205 and causes the discharge port 2
Exhaled from 10.

As described above, in the previously proposed thin pump, the blade and the rotor magnet 203 are integrated to form the ring-shaped impeller 201, which is supported by the cylindrical portion 207 and the motor stator 204 is inserted therein. Thus, the length of the entire pump in the direction of the rotation axis is made as small as possible, the rotation axis is omitted, and the cylindrical portion 207 has both a separating plate function for sealing and a shaft supporting function.
By directly supporting 3 the pump can be made ultra-thin.

[0011]

However, in such an ultra-thin pump, when the ring-shaped impeller rotates,
Since both side surfaces and the inner peripheral surface of the ring slide with the thrust plate and the cylindrical portion of the pump casing, the sliding area is large.
There was a problem that performance deterioration due to friction loss could not be ignored compared to conventional small centrifugal pumps that had an extremely small diameter shaft in the center and had few sliding parts.

The sliding friction causes wear on the sliding portion, which shortens the service life of the parts constituting the sliding portion, and the wear causes the liquid film to break and make vibrations. There was also the problem of increased vibration and noise.

Therefore, an object of the present invention is to provide an ultra-thin pump capable of achieving high performance, long life, and low noise while achieving ultra-thinness.

[0014]

In order to solve this problem, an ultra-thin pump of the present invention has a thrust plate provided on both side surfaces of a ring-shaped impeller or on both side surfaces of a pump casing. It is characterized in that a thrust dynamic pressure generating groove is provided.

As a result, it is possible to realize high performance, long life, and low noise while achieving ultra-thinness.

[0016]

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. An ultra-thin pump in which a cylindrical portion rotatably supports a ring-shaped impeller, and thrust dynamic pressure is applied to a thrust plate provided on both sides of the ring-shaped impeller or on both sides of the pump casing. Since the ultra-thin pump is characterized by the provision of the groove for generating the thrust, the thrust dynamic pressure generating groove is provided on both sides of the ring-shaped impeller so that Since the ring-shaped impeller can be rotated in non-contact with the thrust plate by generating dynamic pressure between it and the thrust plate of the single, it realizes high performance, long life, and low noise of the ultra-thin pump. It becomes possible.

The invention according to claim 2 of the present invention is characterized in that the thrust dynamic pressure generating grooves are formed in a spiral groove array, and the fluid is pushed out to the inner peripheral side of the grooves as the ring-shaped impeller rotates. Since the ultra-thin pump according to claim 1, the thrust dynamic pressure generating groove is formed in a spiral groove pattern so that the fluid is pushed out to the inner peripheral side of the groove as the ring-shaped impeller rotates. Thrust dynamic pressure can be reliably generated.

According to a third aspect of the present invention, the thrust dynamic pressure generating grooves are formed in a herringbone-shaped groove array, and the fluid is pushed out toward the center side in the circumferential direction of the grooves as the ring-shaped impeller rotates. Since it is the ultra-thin pump according to claim 1, the spiral dynamic pressure generating groove is formed in a spiral groove pattern, so that as the ring-shaped impeller rotates, the thrust dynamic pressure generating groove is formed on the center side in the circumferential direction of the groove. The fluid can be pushed out to reliably generate the thrust dynamic pressure.

The invention according to claim 4 of the present invention is characterized in that a radial dynamic pressure generating groove is provided in an inner peripheral surface of the ring-shaped impeller or a cylindrical portion facing the inner peripheral surface of the pump casing. Since it is the ultra-thin pump according to any one of claims 1 to 3, the inner peripheral surface of the ring-shaped impeller and the pump casing are provided by providing a radial dynamic pressure generating groove on the inner peripheral surface of the ring-shaped impeller. The ring-shaped impeller is rotated in non-contact with the cylindrical part by generating a dynamic pressure between the cylindrical part and the ring-shaped impeller, so that the ring-shaped impeller can be completely rotated in non-contact floating with respect to the pump casing. It is possible to realize higher performance, longer life and lower noise of the ultra-thin pump.

In the invention according to claim 5 of the present invention, the radial dynamic pressure generating grooves are formed in a herringbone-shaped groove arrangement, and the fluid is pushed out to the axial center side of the grooves as the ring-shaped impeller rotates. Since it is the ultra-thin pump according to claim 4, the radial dynamic pressure generating groove is formed in a spiral groove pattern so that the radial dynamic pressure generating groove is formed on the axial center side of the groove as the ring-shaped impeller rotates. The fluid can be pushed out to reliably generate the radial dynamic pressure.

The invention according to claim 6 of the present invention is the ultra-thin pump according to claim 4 or 5, characterized in that the thrust dynamic pressure generating groove and the radial dynamic pressure generating groove are communicated with each other. By connecting the thrust dynamic pressure generating groove with the radial dynamic pressure generating groove, fluid is pushed out from the thrust dynamic pressure generating groove side to the radial dynamic pressure generating groove as the ring-shaped impeller rotates, and a strong radial dynamic pressure is generated. The ring-shaped impeller can be levitationally rotated without contact with the pump casing even if the radial load changes due to load fluctuation of the pump, etc., and the pump can be operated stably.

FIG. 1 shows an embodiment of the present invention.
From now on, description will be made with reference to FIG.

(Embodiment 1) FIG. 1 is a side sectional view of an ultra-thin pump according to the first embodiment of the present invention, and FIG. 2 shows the ultra-thin pump according to the first embodiment of the present invention from the rotational axis direction. A sectional view as seen, FIG. 3 is an exploded perspective view of an ultra-thin pump according to the first embodiment of the present invention, and FIG. 4 is a first embodiment of the present invention.
FIG. 5 is a view of the ring-shaped impeller of the ultra-thin pump seen from the inner peripheral side, and FIG. 5 shows the thrust dynamic pressure generating groove of the ultra-thin pump according to Embodiment 1 of the present invention in a herringbone-shaped groove pattern. It is a top view of the ring-shaped impeller in the case.

As shown in FIGS. 1 to 4, 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 ring-shaped impeller 1 is provided with a spiral dynamic pressure generating groove 12 having a spiral groove pattern (arrangement) on both side surfaces thereof, and a herringbone groove pattern (arrangement) on the inner peripheral surface thereof.
The radial dynamic pressure generating groove 13 (see FIGS. 3 and 4) is formed. In addition, although the blade 2 of the first embodiment is the blade of the vortex pump, the blade is not limited to the vortex pump as described above.

The spiral groove pattern of the thrust dynamic pressure generating groove 12 has a shape of a pump which pushes fluid to the inner peripheral side of the groove as the ring-shaped impeller 1 rotates.
A circular flow is formed on the side surface of the ring-shaped impeller 1 to support the thrust, and the herringbone-shaped groove pattern of the radial dynamic pressure generating groove 13 is located on the axial center side of the groove as the ring-shaped impeller 1 rotates. It has a shape that serves as a pump for pushing out a fluid, and forms a central flow to support the ring-shaped impeller 1.

Reference numeral 4 denotes a motor stator provided on the inner peripheral side of the rotor magnet 3, and 5 accommodates the ring-shaped impeller 1, and at the same time, recovers the kinetic energy applied to the fluid by the ring-shaped impeller 1 to the discharge port. Reference numeral 6 denotes a pump casing having a pump chamber for leading to, and a casing cover 6 forming a part of the pump casing and for sealing the pump chamber after housing the ring-shaped impeller 1. The pump casing 5 is provided with a cylindrical portion 7 arranged between the motor stator 4 and the rotor magnet 3 for rotatably supporting the ring-shaped impeller 1 and at the side surface of the ring-shaped impeller 1. A thrust plate 8 for receiving the thrust pressure 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.

By the way, when the ring-shaped impeller 1 rotates, a pumping action of the thrust dynamic pressure generating groove 12 is generated along with it, and the fluid is pushed out to the inner peripheral side of the thrust dynamic pressure generating groove 12 and the ring impeller 1 is rotated. Both sides of and pump casing 5
Thrust dynamic pressure is generated between the thrust plate 8 and
The ring-shaped impeller 1 rotates without making contact with the thrust plate 8. Further, as the ring-shaped impeller 1 rotates, a pumping action of the radial dynamic pressure generating groove 13 occurs, and the fluid is pushed out to the axial center side of the radial dynamic pressure generating groove 13 to form an inner peripheral surface of the ring-shaped impeller 1. Since radial dynamic pressure is generated between the ring-shaped impeller 1 and the cylindrical portion 7 of the pump casing 5, the ring-shaped impeller 1 rotates without contacting the cylindrical portion 7. As a result, the ring-shaped impeller 1 can rotate in a non-contact floating manner with respect to the pump casing 5.

In the first embodiment, the thrust dynamic pressure generating groove 1
Although 2 has a spiral groove pattern, a herringbone groove pattern as shown in FIG. 5 may be used to extrude the fluid toward the circumferential center of the thrust dynamic pressure generating groove 12 to generate thrust dynamic pressure. Further, the thrust dynamic pressure generating groove 12
Although the radial dynamic pressure generating groove 13 and the radial dynamic pressure generating groove 13 are formed in the ring-shaped impeller 1, the thrust dynamic pressure generating groove 12 is formed in the pump casing 5.
It may be formed on the thrust plate 8 side (opposing surfaces on both side surfaces of the ring-shaped impeller 1), or the radial dynamic pressure generating groove 13 may be formed on the cylindrical portion 7 side of the pump casing 5.

As described above, according to the first embodiment, the thrust dynamic pressure generating groove 1 is formed on both side surfaces of the ring-shaped impeller 1.
By providing 2, the dynamic pressure is generated between both side surfaces of the ring-shaped impeller 1 and the thrust plate 8 of the pump casing 5, so that the ring-shaped impeller 1 can be rotated in non-contact with the thrust plate 8. , High performance, long life of ultra-thin pump,
It is possible to achieve low noise.

By providing the radial dynamic pressure generating groove 13 on the inner peripheral surface of the ring-shaped impeller 1, dynamic pressure is generated between the inner peripheral surface of the ring-shaped impeller 1 and the cylindrical portion 7 of the pump casing 5. Since the ring-shaped impeller 1 can be generated and rotated in a non-contact manner with the cylindrical portion 7, that is, the ring-shaped impeller 1 can be completely rotated in a non-contact floating manner with respect to the pump casing 6.
It is possible to realize higher performance, longer life and lower noise of the ultra-thin pump.

(Second Embodiment) FIG. 6 is an exploded perspective view of an ultra-thin pump according to a second embodiment of the present invention.

As shown in FIG. 6, reference numeral 11 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 ring-shaped impeller 11 is formed with thrust dynamic pressure generating grooves 22 having a spiral groove pattern (arrangement) on both side surfaces thereof, and a herringbone-shaped groove pattern (arrangement) on the inner peripheral surface thereof.
The radial dynamic pressure generating groove 23 is formed, and the thrust dynamic pressure generating groove 22 and the radial dynamic pressure generating groove 23 communicate with each other. As described in the first embodiment, the spiral groove pattern of the thrust dynamic pressure generating groove 22 has a shape that acts as a pump that pushes out fluid to the inner peripheral side of the groove as the ring-shaped impeller 11 rotates. The radial dynamic pressure generating groove 23 has a herringbone-shaped groove pattern that has a pumping action that pushes fluid toward the axial center of the groove as the ring-shaped impeller 11 rotates.

Reference numeral 4 denotes a motor stator provided on the inner peripheral side of the rotor magnet 3, and 5 accommodates the ring-shaped impeller 11, and at the same time, recovers the kinetic energy given to the fluid by the ring-shaped impeller 11 to the discharge port. Reference numeral 6 denotes a pump casing having a pump chamber for leading to, and a casing cover 6 forming a part of the pump casing and for sealing the pump chamber after accommodating the ring-shaped impeller 11. The pump casing 5 is provided with a cylindrical portion 7 arranged between the motor stator 4 and the rotor magnet 3 for rotatably supporting the ring-shaped impeller 11 and at the side surface of the ring-shaped impeller 11. A thrust plate 8 for receiving the thrust pressure 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 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. The rotor magnet 3 is integrated with the ring-shaped impeller 11, and since 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.

By the way, when the ring-shaped impeller 11 rotates, a pumping action of the thrust dynamic pressure generating groove 22 is generated along with this, and the fluid is pushed out to the inner peripheral side of the thrust dynamic pressure generating groove 22 to cause the ring-shaped impeller 11 to rotate. Since thrust dynamic pressure is generated between both side surfaces of the thrust plate 8 and the thrust plate 8 of the pump casing 5, the ring-shaped impeller 11 rotates without contacting the thrust plate 8. Further, as the ring-shaped impeller 11 rotates, a pumping action of the radial dynamic pressure generating groove 23 occurs, the fluid is pushed to the axial center side of the radial dynamic pressure generating groove 23, and the inner peripheral surface of the ring-shaped impeller 11 is Radial dynamic pressure is generated between and the cylindrical portion 7 of the pump casing 5.

In the ultra-thin pump of the second embodiment,
The thrust dynamic pressure generating groove 22 and the radial dynamic pressure generating groove 22
Since the fluid is pushed out to the radial dynamic pressure generating groove 23 from the thrust dynamic pressure generating groove 22 side, a strong radial dynamic pressure is generated. As a result, even if the radial load changes due to the load fluctuation of the pump, the ring-shaped impeller 11 can completely rotate in a non-contact floating manner with respect to the pump casing 5.

As described above, according to this embodiment, the thrust dynamic pressure generating groove 22 and the radial dynamic pressure generating groove 23 are formed.
By communicating with, the fluid can be pushed out from the thrust dynamic pressure generating groove 22 side to the radial dynamic pressure generating groove 23 with the rotation of the ring-shaped impeller, and the radial dynamic pressure can be further reliably generated. Even if the radial load changes due to load fluctuation or the like, the ring-shaped impeller 11 can be levitationally rotated without contact with the pump casing 5, and the pump can be operated stably.

[0039]

As described above, according to the present invention, by providing the thrust dynamic pressure generating grooves on both side surfaces of the ring-shaped impeller,
Since it is possible to rotate the ring-shaped impeller in non-contact with the thrust plate by generating dynamic pressure between both sides of the ring-shaped impeller and the thrust plate of the pump casing, it is possible to improve the performance of the ultra-thin pump. A longer life and lower noise can be realized.

Further, by forming the thrust dynamic pressure generating groove in the spiral groove pattern, it is possible to reliably generate the thrust dynamic pressure by pushing the fluid to the inner peripheral side of the groove as the ring-shaped impeller rotates. .

By forming the thrust dynamic pressure generating groove in the spiral groove pattern, it is possible to reliably generate the thrust dynamic pressure by pushing the fluid toward the circumferential center of the groove as the ring impeller rotates. it can.

Further, by providing the radial dynamic pressure generating groove on the inner peripheral surface of the ring-shaped impeller, dynamic pressure is generated between the inner peripheral surface of the ring-shaped impeller and the cylindrical portion of the pump casing to form the ring-shaped impeller. Since the impeller can be rotated in non-contact with the cylindrical part, that is, the ring-shaped impeller can be completely levitated and rotated with respect to the pump casing, the ultra-thin pump has higher performance, longer life, and lower life. It becomes possible to realize noise reduction.

By forming the radial dynamic pressure generating groove in the spiral groove pattern, it is possible to reliably generate the radial dynamic pressure by pushing the fluid toward the axial center side of the groove as the ring-shaped impeller rotates. it can.

Further, by connecting the thrust dynamic pressure generating groove and the radial dynamic pressure generating groove to each other, the fluid is pushed out from the thrust dynamic pressure generating groove side to the radial dynamic pressure generating groove as the ring-shaped impeller rotates, and a strong radial force is generated. The dynamic pressure can be generated, and the ring-shaped impeller can be levitationally rotated without contact with the pump casing even if the radial load changes due to load fluctuation of the pump, etc., and the pump can be operated stably.

[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 a view of the ring-shaped impeller of the ultra-thin pump according to Embodiment 1 of the present invention as seen from the inner peripheral side.

FIG. 5 is a plan view of a ring-shaped impeller in which the thrust dynamic pressure generating groove of the ultra-thin pump according to Embodiment 1 of the present invention has a herringbone groove pattern.

FIG. 6 is an exploded perspective view of an ultra-thin pump according to Embodiment 2 of the present invention.

FIG. 7 is a structural diagram of a conventional small centrifugal pump.

FIG. 8 is a sectional view showing the overall structure of a conventional ultra-thin 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 12,22 Thrust dynamic pressure generating groove 13,23 Radial dynamic pressure generating groove

Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) F04D 29/04 F04D 29/04 R F16C 17/10 F16C 17/10 A (72) Inventor Jozo Azono Kadoma Osaka Prefecture 1006 Kadoma, Ichimaji, Matsushita Electric Industrial Co., Ltd. F term (reference) 3H022 AA01 BA03 BA04 BA06 CA06 CA14 CA56 DA08 DA13 3H031 AA03 AA04 AA05 BA01 BA05 BA11 BA21 BA31 3J011 AA04 AA07 BA04 CA03 KA02 KA03 LA05 MA04

Claims (6)

[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. A rotatably rotatably supported ultra-thin pump, in which thrust dynamic pressure generating grooves are provided in thrust plates provided on both sides of the ring-shaped impeller or on both sides of the pump casing. An ultra-thin pump characterized by that. 2. The thrust dynamic pressure generating grooves are formed in a spiral groove array, and the fluid is pushed out to the inner peripheral side of the grooves as the ring-shaped impeller rotates.
The ultra-thin pump described in. 3. The thrust dynamic pressure generating grooves are formed in a herringbone-shaped groove array, and fluid is pushed out to the center side in the circumferential direction of the grooves as the ring-shaped impeller rotates. The ultra-thin pump described in. 4. A radial dynamic pressure generating groove is provided in an inner peripheral surface of the ring-shaped impeller or a cylindrical portion facing the inner peripheral surface of the pump casing.
The ultra-thin pump described in any one of 1. 5. The radial dynamic pressure generating grooves are formed in a herringbone-shaped groove array, and the fluid is pushed out to the axial center side of the grooves as the ring-shaped impeller rotates. The ultra-thin pump described in. 6. The ultra-thin pump according to claim 4, wherein the thrust dynamic pressure generating groove and the radial dynamic pressure generating groove are communicated with each other.