JP2001153083A - Pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pump capable of preventing air from accumulating inside a rotor. SOLUTION: This pump comprises a rotor 101 having a plurality of vanes 101a and having a rear shroud 101c where a driven magnet 4 is installed, a casing 5 for storing the rotor 101, and a stator 7 formed on the opposed surface of the driven magnet 4 through the easing 5. A circulation flow hole 111 is provided in the rear shroud 101c on the inner side of a vane inlet diameter in the rotor 101 and, therefore, a pressure difference between a circulation flow hole part and a vane outlet part can be assured largely. In addition, because an affection of the circulation flow hole part is small, the flow of fluid at the vane can discharge air accumulated on the surface opposite to the vane of the rear shroud 101c of the rotor 101 without lowering performance.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pump in which air does not stay inside a rotor.

[0002]

2. Description of the Related Art In recent years, in particular, pumps for assembling into equipment have been reduced in size by increasing the rotation speed while the equipment is becoming smaller and lighter. Conventionally, this type of pump is generally a pump in which a return hole is formed between blades in order to discharge air inside the rotor.

Hereinafter, a conventional pump will be described. FIG. 3 is a sectional view of a conventional pump. In FIG. 3, 1 is a rotor, 1a is a blade, 2 is a fixed shaft passing through the center of the rotor 1, 3 is a slide bearing integrally formed with the rotor 1, 4 is a driven magnet, and 5 is a rotor 1
, A thrust bearing that receives the thrust load of the rotor 1, a stator 7 that is formed on the opposing surface of the driven magnet 4 via the casing 5, and a guide 8 that guides the fluid fed from the rotor 1. Volute casing, 9 is a suction port, 10 is a water discharge port, 11 is a rotor 1
And a return hole formed between the blades 1a.

When a control current is applied to the stator 7, the rotor 1 is rotated by being driven by the magnetic field and the driven magnet 4, and a pressure difference is generated between the entrance and exit of the blades of the rotor 1 to fill the rotor 1. In addition to the water being supplied, the air remaining in the rotor is released from the recirculation hole 11 formed between the blades 1a due to the pressure difference.

[0005]

However, in the conventional pump configured as described above, the return hole is formed between the blades, and when the blades feed the fluid by rotation, the fluid in the blades This has the problem that the flow of water flows off at the reflux hole, resulting in a decrease in performance. Furthermore, when the return hole is configured near the blade outlet,
There was a problem that the pressure difference between the return hole and the blade outlet became small, and the air retained inside the rotor was hard to be released.

Accordingly, an object of the present invention is to provide a pump in which air does not stay inside the rotor.

[0007]

According to the present invention, there is provided a rotor provided with a plurality of blades and having a driven magnet provided on a rear shroud, a casing accommodating the rotor, and an opposing face of the driven magnet. A pump having a stator formed on a surface thereof via a casing, wherein a return hole is provided in a rear shroud inside the blade inlet diameter of the rotor.

[0008] With the above configuration, it is possible to realize a pump in which air does not stay inside the rotor.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention is directed to a rotor having a plurality of blades and a magnet to be driven provided on a rear shroud, a casing for accommodating the rotor, and a casing. A pump provided with a stator formed on a facing surface of a driving magnet via a casing, wherein a return hole is provided in a rear shroud inside the blade inlet diameter of the rotor, A large pressure difference between the return hole and the blade outlet can be secured,
Further, by forming the return hole inside the blade inlet diameter, the flow of the fluid in the blade is less affected by the return hole portion, so that a pump in which air does not stay inside the rotor without deterioration in performance can be obtained.

According to a second aspect of the present invention, there is provided the pump according to the first aspect, wherein the blade inlet diameter on the front shroud side is smaller than the blade inlet diameter on the rear shroud side. Since a large pressure difference between the hole and the blade outlet can be ensured, the flow of fluid in the blade is less affected by the return hole, and the blade is formed in the direction of sucking air and fluid from the return hole of the rear shroud. Since the air and the fluid from the return hole are more easily sucked into the blade, the air does not stay inside the rotor.

According to a third aspect of the present invention, the return hole is provided with a suction port (eyeball diameter) of a front shroud of the rotor.
The pump according to claim 1, wherein the pump is configured to be more outward, a large pressure difference can be secured between the return hole and the blade outlet, and the flow of fluid in the blade is less affected by the return hole. Since the recirculation hole is formed outside the suction port (eyeball diameter) of the front shroud, the air and fluid from the recirculation hole are more easily sucked into the blades, so that the air does not stay inside the rotor.

According to a fourth aspect of the present invention, the diameter of the return hole is larger at an inner portion (a blade passageway side) than at an outer portion of a rear shroud.
The pump according to claim 1, wherein a large pressure difference between the return hole and the blade outlet can be ensured, and the flow of fluid in the blade is less affected by the return hole, and the diameter of the return hole is the inner part (the blade passage waterway side). The air and the fluid from the recirculation hole are more likely to be sucked into the blades, so that the air does not stay inside the rotor.

[0013] The invention according to claim 5 of the present invention is characterized in that the return hole constitutes a guide member for guiding the air and fluid staying around the return hole on the blade water passage side to the blade inlet. 2. The pump according to claim 1, wherein a large pressure difference between the return hole and the blade outlet can be ensured, the flow of fluid in the blade is less affected by the return hole, and the air flows from the return hole by the guide member. Further, since the fluid is more easily sucked into the blade, air does not stay inside the rotor.

According to a sixth aspect of the present invention, there is provided a centrifugal concave-convex or groove-shaped blade for guiding air and fluid retained on the surface of the rotor rear shroud opposite to the blade to the return hole. The pump according to claim 1, wherein a large pressure difference between the return hole and the blade outlet can be ensured, and the flow of fluid in the blade is less affected by the return hole, and the centrifugal irregularities or Since the groove-shaped blade guides the air and fluid remaining on the surface of the rear shroud on the opposite side of the blade from the blade, the air does not stay inside the rotor.

(Embodiment 1) FIG. 1 is a sectional view of a pump according to Embodiment 1 of the present invention. 101 is a rotor, 101a is a blade of the rotor 101, 101b is a front shroud of the rotor 101, 101c is a rotor 10
1 is a rear shroud, 2 is a fixed shaft that passes through the center of the rotor 101, 3 is a slide bearing integrally formed with the rotor 101, 4 is a driven magnet, and 5 is a rotor 101.
, A thrust bearing that receives a thrust load of the rotor 101, a stator 7 that is formed on the opposing surface of the driven magnet 4 via the casing 5, 8
Is a volute casing for guiding the fluid sent from the rotor 101, 9 is a suction port, 10 is a water discharge port, and 111 is a return hole.

The recirculation hole 111 is formed in the rear shroud 101c inside the blade inlet diameter of the rotor 101 and outside the suction port (eyeball diameter) of the front shroud 101b. The diameter of the section (vane passage side) is configured to be large. Also,
On the water passage side of the return hole 111, a guide member 111a for guiding the retained air and fluid to the blade entrance is configured, and further, the air and the fluid retained on the surface of the rear surface shroud 101c of the rotor 101 opposite to the blade are returned. Hole 1
Centrifugal uneven or groove-shaped blade 101 leading to 11
d is configured. Note that the same elements as those in the related art are denoted by the same reference numerals.

Next, the operation principle of the pump configured as described above will be described. When a control current is applied to the stator 7, the magnetic field and the driven magnet 4 of the rotor 101 are
The rotor 101 is driven and rotated by the
Due to the rotation of the blade 101a, the filled fluid is sent from the suction port 9 to the water discharge port 10 via the rotor 101 and the volute casing 8.

At this time, the air and fluid remaining on the surface of the rear shroud 101c of the rotor 101 on the side opposite to the blades are rejected by the recirculation hole 111 formed inside the blade inlet diameter of the rotor 101. Due to the pressure difference at the outlet, the gas flows toward the reflux hole 111 side,
Since the centripetal blade 101d is formed on the surface of the rear shroud 101c on the side opposite to the blade, the centrifugal blade 101d can be forcibly guided to the reflux 111.

Further, the air and the fluid guided to the return hole 111 are formed in the rear shroud 101c in which the return hole 111 is located outside the suction port (eye diameter) of the front shroud 101b of the rotor 101, and the diameter of the hole is changed to the rear shroud. The diameter of the inner part (the blade water passage side) is configured to be larger than the diameter of the outer part, and the guide member 11 is provided on the water passage side of the return hole 111.
1a, the rotor 10 is more efficiently
This is a mechanism that is sucked into one blade 101a and discharged to the water discharge port 10 via the volute casing 8. Thereby, a pump in which air does not stay inside can be obtained.

(Embodiment 2) FIG. 2 is a sectional view of a pump according to Embodiment 2 of the present invention. 201 is a rotor, 201a is a blade of the rotor 201, 201b is a front shroud, 201c is a rear shroud, and 201d is a blade. The difference from the first embodiment is that the rotor 201
The shape of the blade 201a is that the inlet diameter of the blade is configured such that the inlet diameter of the front shroud-side blade is smaller than the inlet diameter of the rear shroud-side blade.

The same elements as those of the first embodiment are denoted by the same reference numerals. Further, the fluid is discharged from the water inlet 9 to the water outlet 10.
The principle of operation to feed water to the air outlet and the air and fluid retained on the surface of the rotor rear surface opposite to the shroud blade
Since the principle of operation for releasing to 0 is basically the same as that of the first embodiment, only the differences will be described below.

The rotor 201 has a blade entrance diameter smaller than the front shroud-side blade entrance diameter than the rear shroud-side blade entrance diameter. Therefore, the air and the fluid from the return hole are more easily sucked into the blade 201a.

[0023]

As described above, according to the pump of the present invention,
Since a return hole is provided in the rear shroud inside the rotor inlet diameter of the rotor, it is possible to secure a large pressure difference between the return hole and the blade outlet, and the flow of fluid in the blade is reduced by the return hole. Since the influence is small, it is possible to reliably discharge the air staying in the rotor without deteriorating the performance, and it is possible to realize a pump in which the air does not stay inside.

[Brief description of the drawings]

FIG. 1 is a sectional view of a pump according to a first embodiment of the present invention.

FIG. 2 is a sectional view of a pump according to a second embodiment of the present invention.

FIG. 3 is a sectional view of a conventional pump.

[Explanation of symbols]

 Reference Signs List 4 driven magnet 5 casing 7 stator 101, 201 rotor 101a, 201a rotor blade 101b, 201b front shroud 101c, 201c rear shroud 101d, 201d centripetal blade 111 return hole

Claims (6)

[Claims] A rotor provided with a plurality of blades and having a driven magnet provided on a rear shroud; a casing for accommodating the rotor; and a casing opposed to a face of the driven magnet, the casing being provided. A recirculation hole is provided in a rear shroud inside a rotor inlet diameter of the rotor. 2. The pump according to claim 1, wherein the blade inlet diameter on the front shroud side is smaller than the blade inlet diameter on the rear shroud side. 3. The pump according to claim 1, wherein the return hole is provided outside a suction port of a front shroud of the rotor. 4. The pump according to claim 1, wherein the diameter of the return hole is larger at an inner portion than at an outer portion of the rear shroud. 5. The pump according to claim 1, wherein said return hole comprises a guide member for guiding air and fluid retained around the return hole on the blade water passage side to the blade inlet. 6. A centrifugal concave / convex or groove-shaped blade for guiding air and fluid retained on a surface of the rear shroud opposite to the blade of the rotor to the return hole. The described pump.