JPS6220400B2 - - Google Patents

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention rotates an impeller through a rotating body integrated with the driven magnet by magnetic rotation of the driven magnet as the driving magnet rotates, thereby feeding liquid. This relates to magnetic pumps.

(Prior art) As a conventional magnetic pump of this type, the second
As shown in the figure, a rotating body 7 with a driven magnet 10 rotated by the rotating magnetic field of a drive magnet 4 provided outside the partition 5 is placed inside a cylindrical partition 5 whose opening is covered by an end plate 6. A rotating body 7 is provided via a fluid passage 11 and is pivotally supported at the center of the end plate 6 within an impeller chamber 14 provided outside the end plate 6.
It is known that an impeller 12 is attached to the end of the spindle. Such a magnetic pump uses a suction pump in order to smooth the operation and prevent wear of the bearings 8 and 9 that support both the support shafts 21 and 22 of the rotating body 7, and to prevent a rise in temperature of the magnetic pump itself. A part of the liquid to be pumped is introduced into the gap between the bearings 8 and 9 using the space formed by the partition tank 5 and the rotating body 7 as a fluid passage for lubrication and cooling. This liquid is introduced into the fluid passage before driving the magnetic pump to prevent dry running, but it is difficult to completely eliminate gases such as air and gas from the fluid passage, and some gas may be present. If the operation is carried out with the residual fluid remaining in the bearing, friction with heat generation will occur in the bearing part, resulting in significant damage. Since the circulation of liquid in the passages and the introduction of new liquid into the fluid passages are not sufficiently carried out, the bearing parts become extremely hot after long-term operation, and the bearing parts further deteriorate their bearing characteristics. As the temperature decreases, the temperature of the rotating body 7 and other components increases, leading to a decrease in the magnetic force of the drive magnet 4 and the driven magnet 10, resulting in disadvantages such as a decrease in pump efficiency and a shortened lifespan of the magnetic pump itself. It was hot.

(Problems to be Solved by the Invention) The present invention solves the above-mentioned conventional drawbacks, and
It was completed with the aim of creating a magnetic pump that can sufficiently cool the bearings in the magnetic pump's partition tank with liquid without residual gas, thereby preventing a drop in pump efficiency or shortened pump life. It is something.

(Means for Solving the Problems) The present invention provides a rotary body with a driven magnet that is rotated by the rotating magnetic field of a drive magnet provided outside the cylindrical tank whose opening is covered by an end plate. is provided around it via a fluid passage, and an impeller is attached to the spindle end of the rotating body, which is supported by a bearing in the center of the end plate in an impeller chamber provided outside the end plate. In the net pump, the rotating body is inclined from the center of the end face facing the tank bottom of the partition tank toward the outer periphery of the other end face facing the end plate, and the bearing is removed from the tank bottom by the rotation of the rotating body. The rotor has multiple through-holes that suck the liquid through the rotor, discharge it toward the center of the space formed between the end plate and the rotor, and return it to the impeller chamber via the bearing. The through hole is equally spaced around the axis of the impeller, and the end plate is opened closer to the outer periphery than the opening position of the through hole, and the liquid pressurized in the impeller chamber is guided to the part closer to the outer periphery of the space. , further comprising a plurality of through holes for feeding the fluid into the fluid passage.

(Embodiments) The present invention will be described in detail below with reference to illustrated embodiments.

Reference numeral 1 designates a base of a magnetic pump, and on one side thereof is provided a drive magnet support 3 integrally fixed to a drive shaft 2 rotated by an electric motor (not shown), with a drive magnet 4 at the tip thereof. The drive magnet supports 3 are arranged symmetrically and
A cylindrical partition tank 5 whose one end is fixed to the base plate 1 is fitted and held inside with its center axis aligned with the axis center line of the drive shaft 2, and an opening at one end of the partition tank 5 is fitted. is covered with an end plate 6 having an opening in the center. In the partition tank 5, a support shaft 21 at one end is supported by a bearing 8 installed between the opening at the center of the end plate 6, and a support shaft 22 at the other end is supported by a support shaft 22 at the bottom 5a of the partition tank 5. A rotating body is supported by a bearing 9 installed between a recess 23 formed in the center of the partition tank 5 and a series of fluid passages 11 are formed between the partition tank 5 and the rotating body 7. , a partition tank 5 is provided on the outer surface of the body of the rotating body 7.
A plurality of driven magnets 10 are disposed so as to correspond to the drive magnet 4 across the cylindrical wall of the rotor. The shaft is rotated with the support of bearings 8 and 9. A casing 13 is held on the outside of the end plate 6 by bolts or the like to form an impeller chamber 14 between the end plate 6 and the casing 13. The casing 13 is provided with a liquid suction port 31 and a liquid discharge port 32. In addition, the rotating body 7 is
An impeller 12 is attached to the support end on the side of the end plate 6 so as to rotate with the rotation of the rotating body 7, and as the impeller 12 rotates, liquid is sucked through the suction port 31 on the front surface of the casing 13. Upper outlet 3
2.

The rotating body 7 is provided with a plurality of through holes 19 that are inclined from the center of the end face facing the tank bottom 5a of the partition tank 5 toward the outer periphery of the other end face facing the end plate 6. Transparent holes are provided evenly around the circumference to communicate a portion near the center of the space 40 formed between the end plate 6 and the rotating body 7 and a central portion of the fluid passage 11 facing the tank bottom 5a of the partition tank 5. I'm letting you do it. This through hole 19 has one end opening on the side of the tank bottom 5a as a bearing 9 on the end surface of the rotating body 7.
It faces the recess 20 formed inside the
Liquid is sucked from the tank bottom 5a through the bearing 9 by the centrifugal force generated by the rotation of the rotating body 7, and is discharged into a portion near the center of the space 40.
The liquid discharged from the through hole 19 into a portion near the center of the space 40 in this manner is returned to the impeller chamber 14 via the bearing 8.

In addition, a plurality of through holes 18 are provided in the end plate 6 to communicate the vicinity of the outer circumference of the impeller chamber 14 with a portion near the outer circumference of the space 40 . This through hole 1
The opening position of the through hole 8 on the space 40 side is closer to the outer periphery than the opening position of the through hole 19, and the opening position of the through hole 18 on the impeller chamber 14 side is located closer to the outer periphery than the opening position of the through hole 18 on the space 40 side. There is. This through hole 1
8 transfers the pressurized liquid in the impeller chamber 14 to a space 40
The fluid passage 1 is guided to a portion near the outer periphery of the
It is for sending to 1. As mentioned above, the liquid flows into the portion near the outer periphery of the space 40 through the through hole 18, and the liquid flows into the portion near the center through the through hole 1.
In addition to the liquid being discharged from the bearing 8 facing the space 40, the liquid is sucked from the bearing 8 facing the space 40, and the outer circumference of the boss on the back side of the impeller is under low pressure, so a large pressure gradient is formed inside the space 40 in the radial direction. If this pressure gradient becomes high near the center, the liquid will not be discharged smoothly from the through hole 19.
If necessary, the diameters of the through holes 18 and 19 may be adjusted, or a suitable pressure control means may be formed inside the space 40 to adjust the pressure gradient in the space 40.

(Function) With this structure, if liquid is supplied to the casing 13 before the magnetic pump starts driving, the liquid will flow from the impeller chamber 14 to each through hole 18 provided in the end plate 6. The gases such as air and gas in the fluid passage 11 and the through hole 19 easily and quickly flow into the fluid passage 11 through the through hole 18 located on the lower side, so that gases such as air and gas in the fluid passage 11 and the through hole 19 are absorbed by the liquid. Due to the pressure of
The interior is filled with liquid to achieve complete evacuation and lubrication of each bearing 8,9. When the drive shaft 2 is rotated by an electric motor (not shown) after such evacuation is completed, the driven magnet 10 is magnetically rotated by the drive magnet 4 which rotates accordingly, and the rotating body 7 is supported by the bearings 8 and 9. Due to the rotation of the impeller 12, the liquid is suctioned and pumped through the casing 13. At that time, new liquid flows from the impeller chamber 14 to a portion near the outer periphery of the space 40 through the through hole 18 provided in the end plate 6 due to the rotation of the rotating body 7 and the impeller 12 described above, and flows into the space 40. A part of the liquid is sucked into the impeller chamber 14 through the gap between the bearings 8 of the end plate 6, creating a flow of liquid, thereby cooling and lubricating the bearing 8 on the end plate 6 side. Also, through the through hole 18, the space 4
The remainder of the liquid that has flowed into the part near the outer periphery of the tank flows through the fluid passage 11 to the part facing the tank bottom 5a, and cools the bearing 9 through the gap in the bearing 9 while being transparently inserted into the rotating body 7. A circulating flow is generated in which the liquid is absorbed into the through hole 19. At the same time, the rotating body 7
The liquid filling the through hole 19 of the rotating body 7
The liquid flows out from the tank bottom 5a side toward the inner periphery of the space 40 due to the centrifugal force caused by the rotation of the liquid, and further merges with a part of the liquid that has flowed into the outer periphery of the space 40 from the through hole 18. The bearing 8 is cooled through the gap in the bearing 8 and enters the impeller chamber 14, and as a result, new liquid flows into the through hole 18 in the same way as above.
The liquid is introduced into the liquid passageway 11 through the liquid passageway 11 . Note that the pressure near the center of the space 40 is higher than the pressure near the outlet of the through hole 19, which prevents liquid from being discharged from the through hole 19 due to centrifugal force. Space 40 due to suction of
Since a large pressure gradient that decreases toward the center is formed inside the through hole 19, the liquid is smoothly discharged from the through hole 19, and there is no risk of backflow. Such circulation of the liquid cools and lubricates both bearings 8 and 9, and prevents the temperature of the liquid in the partition tank 5 from rising. Note that the opening position at the center of the end face facing the tank bottom 5a of the through hole 19 transparently provided in the rotating body 7 is flared toward the drive axis side than the opening position at the end face facing the end plate 6. Because it is tilted, the centrifugal force acts on the liquid flowing in the through hole 19 in the most balanced manner, and the liquid flows smoothly in the through hole 19 with the smallest liquid resistance. The amount of liquid circulating to the fluid passages 11 and the like is increased, and the bearings 8 and 9 are cooled and lubricated and other parts are cooled very effectively. Further, a recess is provided in the center of the tank bottom 5a, and a rotating body 7 is pivotally supported on the tank bottom 5a of the partition tank 5.
A recess 20 is provided in the end face of the support shaft 22 of the recess 2.
If one end of the opening of the through hole 19 faces inside the through hole 19, centrifugal force and suction force will be effectively exerted on the liquid in the through hole 19, and the amount of liquid circulating in the fluid passage 11 etc. in the partition tank 5 will be reduced. Cooling is also increased as above,
It is more effective for lubrication, etc.

In addition, to give an example of the flow rate and pressure of the circulating flow explained above, the discharge amount of the magnetic pump is 0.2 m ³ /min, the discharge pressure is 3 Kg/cm ² , and the pressure of the suction port is 0 Kg/cm 2 . cm ² , 500 c.c./minute of liquid per 181 through holes in the end plate 6 flows through the fluid passage 11.
The pressure is approximately 3 kg/cm ² at the outer periphery of the space 40, but it decreases while flowing through the liquid passage 11, and the pressure drops to the bottom 5a of the partition tank 5. It is approximately 2.8Kg/cm ² in the part where the weight is applied.
This pressure decreases by 1 Kg/cm ² when passing through the bearing 9 and reaches 1.8 Kg/cm ² in the recess 20 .
And the through holes 19 of the rotating body 7 are 100c.c./piece.
The liquid flows within 1 minute, is pressurized to 2.3 kg/cm ² by centrifugal force, and is discharged to the inner circumferential portion of the space 40, through the bearing 8 together with a portion of the liquid from the through hole 18, into the impeller chamber 14. It will return to the part near the center.

(Effects of the Invention) As is clear from the above examples, the present invention has the following effects:
Since the compartment of the magnetic pump is filled with liquid and gas-free, each bearing is completely lubricated, significantly reducing heat generation and damage, extending the service life of the magnetic pump. The liquid can be easily introduced into the bulkhead, and the liquid can be circulated effectively in the bulkhead, effectively lubricating and cooling each bearing, and at the same time increasing the temperature of each component. is also prevented. Therefore, according to the present invention, the decrease in the magnetic force of the driving magnet and the driven magnet due to temperature rise can be minimized, the magnetic pump can be maintained at high performance for a long period of time, and the maintenance and inspection work thereof can be greatly reduced. Therefore, the present invention greatly contributes to the development of industry as it solves the problems of conventional magnetic pumps.

[Brief explanation of the drawing]

FIG. 1 is a central vertical sectional view showing an embodiment of the present invention;
FIG. 2 is a central vertical sectional view showing a conventional magnetic pump. 4: Drive magnet, 5: Separation tank, 6: End plate,
7: Rotating body, 10: Driven magnet, 11: Fluid passage, 12: Impeller, 14: Impeller chamber, 18,1
9: through hole, 20: recess, 40: space.

Claims (1)

[Scope of Claims] 1. A rotating body 7 with a driven magnet 10 rotated by the rotating magnetic field of a driving magnet 4 provided outside the cylindrical partition 5 whose opening is covered by an end plate 6. A support shaft of the rotating body 7 is provided around the end plate 6 via a fluid passage 11, and is supported by bearings 8 and 9 in the center of the end plate 6 within an impeller chamber 14 provided outside the end plate 6. In a magnetic pump with an impeller 12 attached to the end, a partition tank 5 is attached to the rotating body 7.
is inclined from the center of the end face facing the tank bottom 5a toward the outer periphery of the other end face facing the end plate 6, and as the rotating body 7 rotates, liquid is sucked from the tank bottom 5a via the bearing 9. The liquid is discharged into a part near the center of the space 40 formed between the end plate 6 and the rotating body 7, and the plurality of through holes 19 are rotated to return the liquid to the impeller chamber 14 via the bearing 8. They are equally transparent around the axis of the body 7, and the end plate 6 is opened closer to the outer periphery than the opening position of the through hole 19, so that the liquid pressurized in the impeller chamber 14 can be passed through the space 40. A magnetic pump characterized in that a plurality of through holes 18 are formed to guide the fluid to a portion near the outer periphery of the magnet and further feed the fluid into the fluid passage 11. 2 Rotating body 7 supported pivotally on the tank bottom 5a of the partition tank 5
2. The magnet pump according to claim 1, wherein a recess 20 is provided in the end face of the support shaft, and one end opening of the through hole 19 is exposed into the recess 20.