JP2007231867A - Vortex pump - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a long-life vortex pump having a bearing structure in which chattering is hardly caused. <P>SOLUTION: The vortex pump 1 includes an impeller 20 comprising a plurality of blades 22 formed on the periphery of the impeller and a rotor magnet 40 provided on the inner periphery thereof, a shaft 41 secured to the center of the impeller 20, a bearing member (ball bearing 50) arranged on the outer periphery of the shaft 41, a motor stator 70 arranged below the impeller 20 and on the inner peripheral side of the rotor magnet 40, and case members 10, 60 having an intake port and a discharge port, for containing the impeller 20 therein and partitioning the impeller 20 from the motor stator 70. In the vortex pump 1, by providing a permanent magnet 54 for attracting the impeller 20 toward the motor stator between the ball bearing 50 as the bearing member and the motor stator 70, the above-described problem can be solved. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a vortex pump in which fluid sucked from a suction port by rotation of an impeller is sent out from a discharge port through a fluid passage, and more particularly, to a long-life eddy current pump that hardly generates backlash in a bearing structure. .

  In recent years, a system for circulating a refrigerant using a refrigerant circulation pump has been studied as a method for efficiently cooling a CPU or the like of a notebook computer or the like. The pump used in such a system is required to have a long life, and is also required to be thin, as is the tendency of notebook personal computers to be thin. In recent years, fuel cells mounted on notebook personal computers have been studied, but small pumps are also used in fuel supply devices for sending fuel (oxygen, air, water, etc.) to such fuel cells. Yes. In particular, a pump for a fuel cell is required to have low power consumption in order to suppress power consumption of the pump as much as possible.

As a conventional small pump, for example, the eddy current pump described in Patent Document 1 below has an 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 a shaft for rotating the impeller. The motor stator is provided on the inner peripheral side of the rotor magnet, and the impeller and the motor stator are hermetically partitioned, and the pump casing has a suction port and a discharge port. In this vortex pump, the motor structure is an outer rotor structure, and the impeller and the motor stator are integrated and hermetically partitioned to achieve a reduction in size and thickness.
JP 2003-161284 A

  The vortex pump described in Patent Document 1 has a pivot bearing structure. However, if a lubricant is not applied to the pivot bearing, shaft loss increases, power consumption increases, pump efficiency decreases, and bearings wear. Play occurs and the service life is short. On the other hand, even if lubricant is given to the pivot bearing, if coolant or water enters the bearing, the lubricant will flow out, resulting in large power consumption, lowering pump efficiency, and backlash due to bearing wear. There is a problem that it is easy to maintain a stable rotation operation for a long time.

  For such problems, a vortex pump having a sleeve bearing structure is also proposed, but a sleeve bearing that requires a lubricant has the same problem as that of the pivot bearing. Further, in the eddy current pump that is required to be thin, it is necessary to reduce the L / D ratio of the sleeve bearing. However, a sleeve bearing with a low L / D ratio is liable to cause backlash in the bearing structure, and there is a problem that the impeller shakes and the impeller hits the case member. Since the gap between the impeller and the case member tends to be as airtight as possible in order to increase the pump output, the occurrence of the shake of the impeller due to the backlash is a big problem.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a long-life eddy current pump that hardly generates backlash in a bearing structure.

  An eddy current pump according to the present invention for solving the above-described problems includes an impeller having a plurality of blades on the outer periphery and a rotor magnet provided on the inner periphery, a shaft fixed to the center of the impeller, and the shaft A bearing member disposed on the outer periphery of the rotor, a motor stator provided on the inner peripheral side of the rotor magnet below the impeller, and a suction port and a discharge port. In a vortex pump comprising an impeller and a case member for partitioning the motor stator, a suction structure for sucking the impeller toward the motor stator is provided between the bearing member and the motor stator. To do.

  According to the present invention, since the suction structure for sucking the impeller toward the motor stator is provided between the bearing member and the motor stator, the inclination of the impeller is suppressed, and it is difficult for the bearing structure to be loose. As a result, there is no vibration of the impeller, and a stable rotation operation can be maintained for a long time. Even if such a vortex pump of the present invention is provided with a bearing having a small L / D ratio, the inclination of the impeller is suppressed, the backlash of the impeller is less likely to occur, and the vibration of the impeller is increased. The car does not hit the case member and can maintain a stable rotation operation to achieve a long life. For example, a CPU cooling pump for a notebook computer or a thin long life pump for a fuel cell Can be preferably used.

  In the vortex pump according to the present invention, a magnet is provided in the case member disposed below the impeller, and the impeller is attracted to the motor stator by the magnet. According to this invention, the suction of the impeller to the motor stator side is performed by the magnet provided in the case member on the lower side of the impeller, so that the suction structure can be simplified.

  In the vortex pump of the present invention, the lower surface of the impeller on the motor stator side and the surface of the member facing the surface are provided with ring-shaped convex portions centering on the shaft. Features. According to this invention, since the impeller is attracted to the motor stator side, the space between the ring-shaped convex portions provided facing each other is narrowed and acts as a seal portion.

  In the eddy current pump according to the present invention, two or more of the convex portions are provided on each of the surfaces, and the magnet is provided in a ring shape below a space surrounded by the convex portions. . According to the present invention, two or more convex portions are provided on each surface, and the magnet is provided in a ring shape below the space surrounded by the convex portions, so two or more convex portions and magnets are provided. A closed magnetic path is configured to form a preferable suction structure, and the convex portions formed on each surface also act as a seal portion. As a result, the backlash of the bearing structure can be eliminated, and the fluid can be effectively prevented from entering the shaft of the member.

  The vortex pump of the present invention is characterized in that grease or magnetic fluid is held in a space surrounded by the convex portion. According to the present invention, since grease and magnetic fluid are held in the space surrounded by the convex portions, it is possible to more effectively prevent the fluid from entering the shaft and to apply the lubricant to the bearing member. If it is, the grease or magnetic fluid can prevent evaporation or dispersion of the lubricant.

  In the vortex pump of the present invention, the bearing member is a ball bearing, a sleeve bearing, or a pivot bearing. According to the present invention, it is possible to prevent the occurrence of play in various bearing structures using a lubricant.

  According to the eddy current pump of the present invention, since the backlash hardly occurs in the bearing structure, there is no vibration of the impeller, and a stable rotation operation can be maintained for a long time. As a result, even when a bearing having a low L / D ratio is provided, the bearing structure is less likely to have rattling, and the impeller does not run out and the impeller does not hit the case member, which is stable. The rotation operation can be maintained and a long life can be realized. For example, it can be preferably used as a CPU cooling pump for a notebook computer or a thin long life pump for a fuel cell.

  The best mode for carrying out the present invention will be described below with reference to the drawings. Needless to say, the vortex pump of the present invention is not limited to the examples of the following embodiments as long as it has the technical features.

  FIG. 1 is an exploded perspective view showing an example of the vortex pump according to the present invention, and FIG. 2 is a cross-sectional view taken along line AA of the vortex pump shown in FIG. FIG. 3 is a sectional view showing another example of the vortex pump according to the present invention.

  As shown in FIGS. 1 to 3, the vortex pump 1 of the present invention is a pump that introduces fluid (gas or liquid) from a suction port 61 and discharges it from a discharge port 62, and has a plurality of blades 22 on the outer periphery. An impeller 20 provided with a rotor magnet 40 on the inner periphery, a shaft 41 fixed to the center of the impeller 20, a bearing member (ball bearing 50 in FIG. 1) disposed on the outer periphery of the shaft 41, The motor stator 70 provided on the inner peripheral side of the rotor magnet 40 below the impeller 20, and a suction port 61 and a discharge port 62 are accommodated, and the impeller 20 and the motor stator 70 are accommodated. And partitioning case members 10 and 60. A suction structure (permanent magnet) that sucks the impeller 20 toward the motor stator is provided between the ball bearing 50 that is a bearing member and the motor stator 70. Further, ring-shaped convex portions (31, 32, 56, 57) are provided facing the lower surface of the impeller 20 on the motor stator side and the surface of the member facing the surface. 1 to 3, reference numeral 80 represents a substrate located under the motor stator 70.

  The impeller 20 is a disk-shaped rotating body having a plurality of blades 22 on the outer periphery, and as shown in FIGS. 1 to 3, a ring-shaped blade member 21 and a disk-like shape for mounting the blade member 21 on the outer periphery. And a ring-shaped rotor magnet 40 mounted on the inner surface side of the outer peripheral wall of the yoke 30. The impeller 20 is fixed to a shaft 41, and the shaft 41 is supported by a ball bearing 50 attached to the case member 60. Such an impeller 20 is accommodated in a case member composed of the upper case member 10 and the lower case member 60, and can generate a vortex of the fluid by the rotation thereof.

  The blade member 21 is a ring-shaped member made of a material such as heat-resistant plastic (PPS: polyphenylene sulfide), and is fixed to the outer periphery of the disk-shaped yoke 30 with an adhesive or the like. The blade 22 formed on the blade member 21 has a form in which a plurality of grooves 23 are formed on the outer periphery of the blade member 21 along the circumferential direction. The groove 23 is formed at both corners where the side surface (upper and lower surfaces) of the blade member 21 and the outer peripheral surface intersect, and is formed so that the corner portion of the blade member 21 is cut out in a fan shape. ing. The number of the blades 22 is not particularly limited, and is usually provided at an arbitrary pitch according to the size of the blade member 21.

  The yoke 30 is a disk-shaped member that mounts the blade member 21 on the outer periphery, and is formed of a magnetic material having a corrosion-resistant surface treatment, such as an SK material. The outer peripheral surface of the yoke 30 is formed with a size that allows the blade member 21 to be mounted, and as shown in FIGS. 1 to 3, a convex edge portion that engages and positions the blade member 21 at a predetermined position. 36 is preferably formed at the lower edge of the outer peripheral surface, for example.

  The rotor magnet 40 is a ring-shaped member attached to the inner surface side of the outer peripheral wall 32 of the yoke 30 with an adhesive or the like, and a permanent magnet such as a neodymium bond magnet is used, for example. The rotor magnet 40 is provided on the lower side of the impeller 20 at a position facing a motor stator 70 disposed on the inner peripheral side of the rotor magnet 40, and rotates to the impeller 20 in cooperation with the motor stator 70. Cause drive. In the present invention, an outer rotor type motor in which the rotor magnet 40 positioned on the outer peripheral side rotates is preferably used.

  The impeller 20 thus configured is fixed to a shaft 41, and the shaft 41 is supported by a bearing member. The form of the bearing member is not particularly limited. For example, a ball bearing 50 as shown in FIGS. 1 and 2 is preferably used, but a sleeve 50 ′ as shown in FIG. 3 may be used.

  The case member is composed of the upper case member 10 and the lower case member 60, and the impeller 20 is accommodated in the space formed by the upper case member 10 and the lower case member 60. The case member has a suction port 61 for sucking fluid, a fluid passage 63 for transporting fluid that has been swirled by the rotation of the impeller 20, and a discharge port 62 for discharging fluid. The fluid passage 63 is formed with a wide width so as to surround the periphery of the blade 22, and the cross section of the fluid passage 63 is formed with a size that widely surrounds the outside of the blade 22. As shown in FIGS. 2 and 3, the size of the fluid passage 63 is formed with substantially the same dimension in the thickness direction of the impeller 20, and with a dimension that is widened outward of the impeller 20. A suction port 61 and a discharge port 62 are provided at both ends of the fluid passage 63. In the present invention, when the impeller 20 is rotated, the fluid existing in the groove 23 constituting the blade portion 21 flows so as to be pushed into the fluid passage 63 by centrifugal action, and conversely, exists in the fluid passage 63. The fluid flows so as to be sucked into the blade 21 and is transferred from the suction port 61 toward the discharge port 62 while forming a vortex.

  An O-ring (not shown) may be provided between the upper case member 10 and the lower case member 60, and sealing between the case members can be ensured. Further, in FIG. 1, through holes for integrally fixing the case members 10 and 60 with bolts and nuts are formed, but the fixing means for the case members 10 and 60 is not limited to such a method. In addition, although the material of case members 10 and 60 is not specifically limited, From a viewpoint of size reduction and weight reduction, it is preferable to use light metals, such as aluminum or its alloy, and heat resistant plastics (PPS).

  The motor stator 70 is disposed on the inner peripheral side of the rotor magnet 40 under the lower case member 60. The yoke 71 constituting the motor stator 70 is provided with winding portions for forming a winding coil at predetermined intervals, and a winding coil 72 is formed in the winding portion. The outer peripheral surface of the motor stator 70 is disposed at a position facing the rotor magnet 40, and the center position of the rotor magnet 40 in the thickness direction of the rotor magnet 40 is such that the shake of the impeller 20 can be suppressed. It is arranged slightly above the center position in the thickness direction. The size of the yoke 71 is a size accommodated in the lower space of the lower case member 60, and the material thereof is preferably a magnetic material similar to that of the yoke 30 of the impeller 20.

  In the vortex pump of the present invention, a suction structure for sucking the impeller 20 toward the motor stator is provided between the bearing member (50, 50 ') and the motor stator 70. As shown in FIGS. 2 and 3, this suction structure is provided with a permanent magnet 54 in the lower case member 60 disposed on the lower side of the impeller 20 so that the impeller 20 is attracted to the motor stator side. This is a structure made by the permanent magnet 54.

  Since the permanent magnet 54 has a suction force that evenly draws the yoke 30 constituting the impeller 20 downward (lower case member 60 side), the permanent magnet 54 is generated, for example, by a difference between the pressure of the suction port 61 and the pressure of the discharge port 62. The inclination of the impeller 20 can be suppressed. As a result, it is possible to maintain a stable rotation operation for a long period of time without the rattling or shaking of the impeller 20.

  Various permanent magnets 54 can be used, but neody bond magnets and the like are preferably used. Further, the installation position of the permanent magnet 54 is not particularly limited, but in FIGS. 2 and 3 and FIG. 6 described later, an example is shown in the vicinity of the bearing member. Further, as shown in FIG. 6, the shape of the permanent magnet 54 may be a ring-shaped integrated structure centering on the shaft 41, or pieces of permanent magnets arranged in a ring at regular intervals. There may be.

  For example, as shown in FIGS. 2, 3, and 6, the permanent magnet 54 is provided below the space 58 surrounded by the opposed ring-shaped convex portions (31, 32, 56, 57). Is preferred. With such a structure, a closed magnetic path composed of the convex portion 56 → the convex portion 31 → the convex portion 32 → the convex portion 57 → the permanent magnet 54 → (the convex portion 32) is formed.

  Further, if grease or magnetic fluid is provided in the space 58, the grease or magnetic fluid acts as a sealing material. Therefore, when a lubricant is applied to the bearing member, evaporation or discreteness of the lubricant is prevented. In addition, it is possible to prevent refrigerant and water from entering the shaft side from the fluid passage 63.

  Next, the sealing effect of the ring-shaped convex portions (31, 32, 56, 57) will be described. As shown in FIGS. 2 and 3, ring-shaped convex portions (31, 32, 56, 57) are provided facing the lower surface of the impeller 20 on the motor stator side and the surface of the member facing the surface. However, the opposing convex portions constitute a seal portion, and the seal portion has an effect of preventing the fluid from entering the shaft 41. In particular, as described above, since the impeller 20 is sucked to the motor stator side by the suction structure, the space between the ring-shaped convex portions provided facing each other is narrowed, and can act as a seal portion.

  Specifically, as shown in FIG. 2, two convex portions 31 and 32 each having a ring shape are formed at a predetermined interval (for example, on the lower surface of the disk-shaped yoke 30 constituting the impeller 20 on the motor stator side. 1 mm intervals). On the other hand, the bearing member, which is a member facing the convex portions 31, 32, has two convex portions 56, which are formed in the same ring shape as the convex portions 31, 32 at positions facing the convex portions 31, 32, respectively. 57 are formed at predetermined intervals (for example, 1 mm intervals). The gap between the convex portions 31 and 56 and the gap between the convex portions 32 and 57 are each about 200 μm. The space 58 surrounded by the convex portions 31, 32, 56, 57 is preferably filled with grease or magnetic fluid as described above. Such a seal portion can effectively prevent fluid from entering the shaft 41. Further, in the case where the bearing member has a lubricant for improving the lubricity, the space 58 is filled with a sealing material, thereby preventing evaporation and dispersion of the lubricant filled in the space 59 on the bearing member side. The lubricity of the shaft or the bearing member can be maintained in a good state.

  Further, in the vortex pump 2 shown in FIG. 3, two convex portions 31 and 32 having a ring shape are formed at a predetermined interval (for example, on the lower surface on the motor stator side of the disk-shaped yoke 30 constituting the impeller 20 (for example, 1 mm intervals). On the other hand, on the upper surface of the lower case member 60, which is a member facing the convex portions 31, 32, two positions having the same ring shape as the convex portions 31, 32 are located at positions facing the convex portions 31, 32 respectively. The convex portions 56 and 57 are formed at a predetermined interval (for example, 1 mm interval).

  4 and 5 are partial cross-sectional views showing other forms provided with convex portions. In the form of FIG. 4, two convex portions 31 and 32 having a ring shape with a predetermined interval are formed on the lower surface of the disk-shaped yoke 30 constituting the impeller 20 on the motor stator side. A convex portion 33 having another ring shape is formed between 31 and 32. On the other hand, the bearing member, which is a member facing the convex portions 31, 32, 33, has the same ring shape as the convex portions 31, 32, 33 at positions facing the convex portions 31, 32, 33, respectively. Three convex portions 56, 57, and 55 are formed at predetermined intervals. Also in this form, it is preferable that the spaces 58A and 58B surrounded by the convex portions 31, 32, 33, 56, 57, and 55 are filled with a sealing material such as grease or magnetic fluid. This seal portion can effectively prevent fluid from entering the shaft 41. In FIG. 4, each of the three convex portions 56, 57, 55 having a ring shape provided on the lower case member side constitutes an end portion of a ring-shaped yoke made of a magnetic material. Two permanent magnets 54, 54 are arranged in a manner sandwiched between the two.

  In the form of FIG. 5, two concave portions 31 ′ and 32 ′ having a ring shape with a predetermined interval are formed on the lower surface of the disk-shaped yoke 30 constituting the impeller 20 on the motor stator side. A recess 35 is further formed between the recesses 31 'and 32'. On the other hand, the bearing member, which is a member facing the recesses 31 ′ and 32 ′, has two convex portions 56 and 57 having a ring shape at predetermined intervals at positions facing the recesses 31 ′ and 32 ′. Is formed. Also in this embodiment, it is preferable that the space 58 surrounded by the concave portions 31 ′, 32 ′ and the convex portions 56, 57 is filled with a sealing material such as magnetic fluid or grease. This seal portion can effectively prevent fluid from entering the shaft 41. In FIG. 5, as in FIG. 4, the two convex portions 56 and 57 each having a ring shape provided on the lower case member side constitute end portions of a ring-shaped yoke made of a magnetic material, Permanent magnets 54 are arranged in a manner sandwiched between the yokes.

  The part which consists of the said structure is formed in the small clearance gap, and acts as a seal part. In addition to preventing the refrigerant flowing through the fluid passage 63 from entering the shaft, the seal portion can prevent evaporation and discreteness of the lubricant when the lubricant is supplied to the bearing member. Therefore, it is possible to eliminate a factor that hinders the rotation operation by the shaft and the bearing member.

In addition, in FIGS. 2-5, although the seal part is formed in the bearing member or its vicinity, what formed the convex part in the other part, for example, the middle of the peripheral direction of the yoke 30, or the outer periphery side, It is preferable for the shake and inclination of the impeller 20, and the outer periphery is particularly effective. However, it is usually preferable that the bearing member is formed at or near the bearing member as shown in FIGS. 2 to 5 because the convex portion is formed at such a part depending on the thickness of the member. This is because it is easy. Moreover, when the sealing material 58 is filled with a sealing material such as grease or magnetic fluid, it is preferable that the sealing portion constituted by the convex portion is formed on the bearing member or in the vicinity thereof. The reason is that if the seal portion is formed on the outer peripheral side, grease or magnetic fluid of the seal portion becomes a rotation resistance and a load is applied, thereby hindering an efficient rotation operation with low power. .

  Moreover, in said embodiment, although the form with which sealing materials, such as grease and magnetic fluid, are filled in the space 58 of a seal part is demonstrated as a preferable form, the labyrinth structure which combined multiple convex parts or recessed parts and By doing so, a sealing material can also be made unnecessary.

  Next, the effect of the present invention when the ball bearing 50 is used as a bearing member will be described. 6 is a perspective sectional view of a bearing member having a ball bearing 50 (51A, 51B) and a permanent magnet 54. FIG. 7 is an explanatory diagram of a preload F applied to the ball bearing 50 by the action of the permanent magnet 54. FIG. In the bearing member shown in FIG. 6, two overlapping ball bearings 50 (51A, 51B) constitute a bearing part, and a ring-shaped permanent magnet 54 is sandwiched between two cylindrical yokes 52, 53 on the outside thereof. Are arranged. As the permanent magnet 54, a magnet having an N pole on the shaft side and an S pole on the outer peripheral side is used.

  Of the two cylindrical yokes 52 and 53, the inner peripheral yoke 52 on the ball bearings 51A and 51B side is fixed to the outer peripheral ring of the ball bearings 51A and 51B by bonding or the like, and the upper part constitutes a seal portion. The projecting portion 56 is formed, and the lower portion thereof is in contact with the lower case member 60. On the other hand, of the two cylindrical yokes 52, 53, the outer yoke 53 sandwiching the permanent magnet 54 is bonded or press-fitted to the inner peripheral surface of the lower case member 60, and the upper portion thereof is a convex portion constituting a seal portion. 57, and the lower part thereof is disposed in contact with the lower case member 60 or with a slight gap therebetween.

  On the shaft 41, the inner ring of the ball bearings 51A and 51B is used in an adhesive or free state, and the yoke 30 constituting the impeller 20 is further provided on the shaft 41 so as to come into contact with the inner ring. It is fixed. The ring-shaped convex portions 31 and 32 formed on the yoke 30 constituting the impeller 20 are provided to face the convex portions 56 and 57, and the convex portions 31 and 32 and the convex portions 56 and 57 are provided. 57 is designed to have a predetermined gap.

  In FIG. 7, the magnetic lines of force of the permanent magnet 54 are described. Due to the action of the permanent magnet 54, a downward force F acts on the yoke 30 constituting the impeller 20. Since this force F acts to push down the shaft 41, the forces F1 and F3 that push down downward also act on the inner peripheral rings of the ball bearings 51A and 51B fixed to the shaft 41. Furthermore, forces F2 and F4 that push downward are also applied to the balls constituting the ball bearings 51A and 51B.

  Due to the action of the forces F1, F3 and F2, F4, a load (preload) is applied to the upper contact portions P, R between the inner ring and the balls constituting the ball bearings 51A, 51B, and the ball bearing 51A , 51B, a load (preload) is applied to the lower side contact portions Q, S of the outer ring and the ball. Since the load (preload) applied to the upper contact portions P and R and the lower contact portions Q and S stabilizes the rotation of the ball bearings 51A and 51B, it is possible to realize a rotational operation that does not cause backlash.

  Although the ratio (L / D) between the length L in the vertical direction and the inner diameter D (L / D) of the bearing member having the form shown in FIG. 7 is generally 2 or more, the vortex pump of the present invention has an upper contact portion. The rotation of the impeller 20 can be stabilized by the action of the load (preload) applied to P, R and the lower contact portions Q, S, and the L / D can be reduced by 2. It can be made less than 0 (of course, may be 2.0 or more), and can be made 1.5 or less, which is effective in reducing the thickness of the vortex pump. When the L / D is small, the impeller 20 is likely to be shaken or tilted. However, the vortex pump of the present invention is less likely to be shaken or tilted even when the L / D is small, so that it is much thinner. Can be realized. The lower limit of L / D is about 1.

It is a disassembled perspective view which shows an example of the vortex pump which concerns on this invention. It is AA sectional drawing of the vortex pump shown in FIG. It is sectional drawing which shows another example of the vortex pump which concerns on this invention. It is a fragmentary sectional view which shows another example of the vortex pump which concerns on this invention. It is a fragmentary sectional view which shows another example of the vortex pump which concerns on this invention. FIG. 3 is a perspective sectional view of the bearing member shown in FIGS. 1 and 2. It is explanatory drawing of the load (preload) added to a ball bearing by the effect | action of a permanent magnet.

Explanation of symbols

1, 2 Eddy current pump 10 Upper case member 20 Impeller 21 Blade portion 22 Blade 23 Groove 30 Yoke 31, 32, 33 Convex portion 31 ', 32', 34 Concavity 36 Convex edge portion 40 Rotor magnet 41 Shaft 50, 51A, 51B Ball bearing 50 'Ceramic sintered member 52 Inner circumferential side yoke 53 Outer circumferential side yoke 54 Permanent magnet 55, 56, 57 Protruding portion 58, 58A, 58B Seal portion space 59 Bearing member side space 60 Lower case member 61 Suction port 62 Exhaust port 63 Fluid passage 70 Motor stator 71 Yoke 72 Winding coil 80 Substrate P, R Upper contact part Q, S Lower contact part F, F1, F2, F3, F4 force

Claims (6)

An impeller having a plurality of blades on the outer periphery and provided with a rotor magnet on the inner periphery, a shaft fixed to the center of the impeller, a bearing member disposed on the outer periphery of the shaft, and the impeller A vortex that includes a motor stator provided on the inner peripheral side of the rotor magnet on the lower side, a suction port and a discharge port, and a case member that houses the impeller and partitions the impeller and the motor stator In the pump,
A vortex pump characterized in that a suction structure for sucking the impeller toward the motor stator is provided between the bearing member and the motor stator.   2. The eddy current pump according to claim 1, wherein a magnet is provided in the case member disposed below the impeller, and the impeller is attracted to the motor stator side by the magnet.   The ring-shaped convex part centering on the said axis | shaft is provided in the lower surface of the said motor stator side of the said impeller, and the surface of the member facing the said surface so that it may oppose. The vortex pump according to 2.   The eddy current according to claim 3, wherein two or more of the convex portions are provided on each of the surfaces, and the magnet is provided in a ring shape below a space surrounded by the convex portions. pump.   The eddy current pump according to claim 4, wherein grease or magnetic fluid is held in a space surrounded by the convex portion. The eddy current pump according to claim 1, wherein the bearing member is a ball bearing, a sleeve bearing, or a pivot bearing.

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