JPH02264193A - Magnet pump and lubricating method in magnet pump - Google Patents

Abstract

PURPOSE:To attempt to improve the maintainability and prolong the life of bearing by separating the inside of a magnet pump to a pump room and a magnet room, and forcibly circulating liquid inside the room to forcibly lubricate a bearing part. CONSTITUTION:The inside of a pump case 1 is separated to a pump room Z1 and a magnet room Z2 with a housing 3 and a magnet case 2, a slave magnet ring is rotated by a motor 8 through a driving magnet ring 6, and an impeller 4 is rotationally driven by a rotary shaft penetrating a separation wall 10. At this time, liquid inside the magnet room Z2 is forcibly circulated by an auxiliary impeller 11 provided on a slave magnet ring 5 as shown by an arrow to lubricate the thrust bearing and the radial bearing respectively of a front bearing part 12 and a rear part 13, and cooled by cooling wind Q through the magnet case 2, thereby the maintainability is improved and prolongation of the life of bearing can be attempted.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a magnetic pump without a shaft sealing device that uses a magnetic coupling to transmit torque from a motor to the pump, and is particularly applicable to magnets such as iron. Suitable for pumps that handle liquids that contain adsorbed solid particles and large particles.

[Conventional technology]

Regarding conventional magnet pumps,
As described in Publication No. 1690, a part of the high-pressure liquid discharged from the pump is introduced into the magnet chamber from the pump chamber, and the heat generated by rotational friction in the liquid due to the rotation of the driven magnet, the eddy current heat generated in the magnet case, and the bearing sliding. It was designed to dissipate dynamic heat and return it to the pump room.

In addition, as another conventional example, Utility Model Application Publication No. 55-], 448
As described in Publication No. 91, there was also a magnet pump with a structure separated into two chambers, an impeller chamber and a magnet chamber.

In addition, Japanese Patent Application Laid-Open No. 61164098 discloses a cooling method for a magnetic chamber that is connected to a magnetic pump.
There are those described in Japanese Patent Application Laid-Open No. 51-111902.

[Problem to be solved by the invention]

In the above-mentioned conventional technology, in which a part of the high-pressure liquid discharged from the pump is guided into the magnet chamber to lubricate and cool bearings, etc., for example, radioactively contaminated water containing iron fine particles with a diameter of about -0 μm is used. In pumps that handle pumps, there is a problem in that a large amount of iron particles adhere to the outer periphery of the driven magnet, increasing workers' exposure to radiation during pump maintenance. In addition, particles with a size of 1001.
When iron scrap particles of about Lm size are included, there is a problem in that these particles not only cause extreme wear on the bearing, but also adhere to the outer periphery of the driven magnet, causing a galling accident with the magnet can.

In addition, a structure in which the impeller chamber and the magnet chamber are divided into two has conventionally been applicable only to small-capacity magneto pumps. In other words, in this method, the driven magnet only rotates while being immersed in the Macscrew 1 chamber, so in large-capacity punchers, the temperature of the liquid in the magnet room increases due to friction loss and eddy current loss caused by the rotation of the driven coupling. This is because there are problems such as excessive rise and burnout of the bearings.

The present invention also applies to magneto pumps that handle liquids containing solid fine particles and large particles that are absorbed by magnets.
The purpose of this invention is to reduce the adhesion of the magnet-adsorbable contaminant particles to the magnet, improve maintainability, and extend the life of the bearing.

Another object of the present invention is to effectively lubricate a bearing provided within a magnet chamber.

Still other objects of the present invention are to be applicable to a large-capacity magnet pump, to be easy to maintain, to extend the life of the bearings, and to effectively cool the liquid inside the magnet.

[Means to solve the problem]

The features of the present invention for achieving the above object are as described in each claim.

That is, the first feature of the present invention is a magnetic pump that handles liquid containing contaminant particles, including means for separating the inside of a pressure vessel of the magnetic pump into a pump chamber and a magnet chamber, and a means for separating the inside of a pressure vessel of the magnetic pump into a pump chamber and a magnet chamber, and a means for forcibly discharging the liquid in the magnetic chamber. The present invention also includes means for forcibly lubricating the internal bearing part of the magnet by circulating it.

A second feature of the present invention is that a drive magnet is connected to a drive motor, a driven magnet is connected to an impeller via a shaft, a bearing rotatably supports the shaft, and the impeller, shaft, driven magnet, and bearing are connected to each other. In a magnetic pump that includes a pump case and a magnet case that are housed inside and have a pump handling liquid therein to form a pressure vessel, a separation wall is provided between the impeller and the driven magnet so that the inside of the pressure vessel is auxiliary impeller means is provided in a chamber in which said driven magnet is provided, isolating said driven magnet and bearing portion from said impeller portion and is rotated by said shaft, and liquid in said chamber is directed to said bearing by said auxiliary impeller means. It consists in circulating supply.

A third feature of the present invention is a driving magnet, a driven magnet connected to the impeller via a shaft, a bearing rotatably supporting the shaft, a pump case housing the impeller therein, and a driven magnet connected to the impeller through a shaft. and a magnetic case that stores the bearing inside,
A separation wall that separates the inside of the pump case and the inside of the magnet case and allows the shaft to freely pass through the separation wall, and a liquid inside the magnet case is forcibly circulated and supplied to the bearing section to forcibly lubricate the bearing. The magnetic pump is equipped with forced circulation means.

A third feature of the present invention is that a drive magnet section, a driven magnet section connected to the impeller via a shaft, a bearing that supports the shaft, a pump case that houses the impeller, and a driven magnet section that houses the driven magnet section. a separation wall that separates the inside of the pump case from the inside of the magnet case and is penetrated by a shaft;
means for forcibly circulating the liquid in the magnet can to lubricate the bearing part; an air flow hole is formed so as to penetrate a side wall of the drive magnet part; a fan formed in the air flow hole; The magnet pump has nine heat dissipation fins formed on the side wall of the magnet case facing the side wall of the drive magnet part.

A fourth feature of the present invention is that a pressure vessel is formed of a pump case and a magnet case and is filled with pump handling liquid, an impeller and a driven magnet housed in this pressure vessel, and a a driving magnet magnetically coupled to the magnet; a driving machine that rotates the driven magnet and the impeller via the driving magnet; a magnet housing provided on the outer peripheral side of the driving magnet and attached to the pressure vessel; A drive case that covers the drive machine and is attached to the magnet housing; a separation wall that separates the inside of the pressure vessel into an impeller chamber and a magnet chamber; and a pump means for lubricating bearings in the chamber.

A fifth feature of the present invention is that a driving magnet connected to a driving means, a driven magnet connected to an impeller via a shaft, a bearing rotatably supporting the shaft, and a bearing that rotatably supports the shaft are housed inside and the pump handles liquid. In a magnetic pump having a pump case and a magnet case that are filled inside and serve as a pressure vessel, the inside of the pressure vessel is separated into a pump chamber and a magnet chamber, and then the pump handling liquid in the magnet chamber is forcedly circulated to the bearing. A method of lubrication in a magnetic pump that supplies and lubricates bearings.

A sixth feature of the present invention is a magnetic pump that handles liquid containing contaminant particles, which includes means for separating the inside of a pressure vessel of the magnetic pump into a pump chamber and a magnet chamber, and a means for forcibly circulating the liquid in the magnetic chamber. and a means for forcibly lubricating the magnetic indoor bearing.

A seventh feature of the present invention is a driving magnet, a driven magnet connected to the impeller via a shaft, a bearing that supports the shaft and is provided between the driven magnet and the impeller, and the impeller and the shaft. , a magnetic pump comprising a pump case and a magnet case that house a driven machinet and a hair ring therein, a separation wall is provided between the impeller and the bearing, and the impeller and the bearing are separated by the separation wall and the shaft and the bearing. The magnet pump has a chamber formed therein, and the inside of the pump case and the inside of the magnet case are separated by the separation wall and the separation chamber.

[Effect]

2, in the present invention, the pump chamber and the magnet chamber are separated, and the liquid in the magnet chamber is forcedly circulated by an auxiliary impeller provided at the end of the driven magnet, thereby cooling the magnet chamber. Therefore, a large amount of pump handling liquid does not always enter the magnet chamber. Therefore, the intrusion of solid particles is also restricted, and a large amount of solid particles can be prevented from being adsorbed by the driven magnet. As a result, galling of the driven magnet and bearing can be prevented, and when this magnet pump is used as a pump in a nuclear power plant, the pump side and the drive side are completely separated by the magnetic case. This not only makes it possible to completely contain the internal fluid contaminated with 4jF of radioactivity, but also greatly reduces radioactive contamination of workers even when the magnet case is removed for maintenance.

Furthermore, in a device that forcibly circulates the liquid in the magnet chamber and leads it to the thrust bearing part, a radial groove is formed on the thrust bearing surface of the thrust bearing part, and a forced '4M ring path to the bearing surface is formed in the thrust bearing part. In the case where an orifice is provided, even when the thrust gap of the thrust bearing changes and the gap is 0, liquid flows through the radial groove, and the liquid is supplied to the thrust bearing. The amount is always kept constant by the orifice part,
Good bearing lubrication is always possible.

In addition, if a slurry filter is installed in the flow path inside the magnet chamber to capture solid particles of several hundred micrometers, the large particles that initially entered the magnet chamber, and the large particles that entered the magnet chamber slightly during operation, can be removed from the magnet. It can be removed from the indoor circulating fluid, resulting in a significant reduction in solid particles.

Furthermore, if a separation wall and a separation chamber are provided between the impeller and the bearing, the inside of the magnet case can be more reliably separated from the inside of the pump case, and the bearing can be installed through the separation wall and separation chamber. Therefore, the amount of solid particles entering the bearing portion is reduced, and the life of the bearing can be extended.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 7. In FIG. 1, the magnetic pump is configured such that a container formed by a pump case 1 and a magnet case (magnet can) 2 is filled with pump handling liquid, and an impeller chamber Z is separated by a separation wall 10 attached to a housing 3.
1 and magnet chamber Z2. A bearing part for supporting the shirt l- is provided between the separation wall and the driven magnet, and a separation chamber 15 is formed by this bearing part and the separation wall. The impeller 4 is connected to a driven magnet (shaft) 5 via a shaft, and the driven magnet shaft 5 is formed with an auxiliary impeller 11 having radial holes.
and is supplied to the rear bearing section 13 to lubricate each bearing section.

The rear bearing part 13 is provided on the inner peripheral side of the end of the driven magnet, and this rear bearing part 13 is provided on the inner peripheral side of the end of the driven magnet.
It consists of a rear thrust bearing 13a shown in the figure, a rear radial bearing 13b shown in FIG. 3, and a rear sleeve 13c shown in FIG. 4. When the thrust force of the impeller 4 decreases and the rotor including the impeller 4, driven magnet 5, rear sleeve 13c, etc. moves in the direction of the motor (driver) 8 and the thrust gap B decreases, the flow flows to the rear bearing section 13. Although the lubricating fluid decreases, in order to prevent such a decrease in lubricating fluid, a radial groove 13d is provided in the thrust bearing surface of the rear sleeve 13c as shown in FIG. 4. Normally, the thrust gap B is about O~1+nm, and the groove 13d
The depth of the lubricating fluid in the rear bearing portion 13 does not change significantly due to a change in the thrust gap B.

On the other hand, the front bearing 12 includes a front thrust bearing 12a shown in FIG. 5 and a front radial bearing 12a shown in FIG.
b, and a front sleeve 12c shown in FIG. Since the thrust gap A changes due to changes in the thrust force of the impeller 4, a radial groove 13d is provided in the front sleeve 2c to prevent insufficient lubrication of the thrust bearing surface when the thrust gap A changes. It is being In addition, an axial cylindrical gap orifice is provided in the flow path in the direction of arrow T so that most of the liquid discharged to the front bearing part of the auxiliary impeller 1 flows in the direction of arrow R and lubricates the radial bearing 12b. Part C is provided. Without this orifice C, most of the discharged liquid would flow in the direction of arrow T due to the radial groove 12d formed in the thrust bearing surface. Moreover, the depth of the groove 12d is
Like the rear bearing part 13, it is made larger than the thrust gap C, and the groove 12d makes the throttle of the Veorifice C much larger than the throttle, so the flow of the arrow T is caused by the change in the thrust gap A. It is hardly affected. Therefore, the flow toward the front radial bearing surface as indicated by arrow R is almost completely unaffected by changes in thrust gap A.

As described above, in the pump to which the present invention is applied, the forced circulation system for the magnet indoor fluid is divided into two systems: one on the front bearing section side and the other on the rear bearing section side.

Furthermore, the Freon 1 - Bear Limp part side system is divided into two routes, a radial bearing side flow path and a thrust bearing side flow path, and an orifice C is provided in the discharge liquid path to the thrust bearing part, and the thrust bearing surface of the thrust bearing part is Since the radial groove 12d is formed on the end surface of the front sleeve,
The amount of lubricant flowing through each part of the front bearing 12 and rear bearing 13 can be appropriately set. Also,
The liquid distribution can also be made almost unchanged by changes in the thrust gaps A and B.

Therefore, appropriate bearing lubrication can be performed in any operating state of the pump.

In addition, cooling of the magnet chamber 22 is achieved by providing a cylindrical motor (driver) case 14 on the outside of the motor 8, and further providing air flow holes 6a, 7a, 7b, and 8a to cool the motor.
A cooling air flow path is formed by causing the air to flow through the airflow holes 8 a H7a + 6a, 7b, and the outer periphery of the magnet case 2 is cooled. The wind flow hole 68a is attached to the mounting housing of the motor 8, and the wind flow holes 7a and 7b are respectively attached to the magnet housing (drive magnet case).
7, a wind flow spoon hole 6a is further formed in the side wall of the drive magnet shaft 6.

As described above, in this embodiment, a radial groove is provided in the thrust bearing part of the front bearing part, and an orifice flow path formed by an axial cylindrical gap is provided on the outside or inside of the thrust bearing part. A flow path is formed such that liquid discharged from the auxiliary impeller passes through the cylindrical orifice flow path and the thrust bearing portion and flows into the auxiliary impeller suction port.

In addition, for magnet indoor cooling in which liquid is forcedly circulated in a closed loop, a cylindrical case is provided outside the motor to collect cooling air from the motor and guide it into the magnet housing 7 through a hole drilled in the magnet housing. Next, the drive magnet is introduced into the outer periphery of the magnet case through the hole drilled in the drive magnet, and after the outer periphery of the magnet case is cooled, it is passed through the hole drilled in the magnet housing again.
It forms a flow path for discharging to the outside of the pump.

Therefore, when the thrust load acting on the impeller changes, the front bearing thrust bearing gap also changes.
Since the gap in the orifice flow path does not change, the flow rate of the lubricant flowing through the thrust bearing in the front bearing section is kept approximately constant by restricting the orifice flow path. The flow is not restricted by the grooves.

For this reason, the flow path resistance on the thrust bearing surface can be made almost independent of the thrust gap, and the amount of lubricating fluid in the front bearing section thrust 1 to the bearings hardly changes even if the thrust gap changes, and the front bearing section radial bearing , an abnormal decrease in the amount of lubricant flowing through the radial bearing of the rear bearing does not occur.

Further, since the motor cooling air is used to cool the magnet chamber, a blower fan provided on the outer shaft of the drive magnet screw 1 is not required, and noise can be reduced.

As explained above, according to the present invention, the bearing lubrication flow distribution will not change due to changes in the thrust force due to changes in the operating flow rate of the pump, and the lubrication of various parts of the bearing will not be incomplete. is obtained. In addition, the two-chamber split-structure magnetic pump with forced circulation inside the magnet chamber prevents foreign matter that would wear out the bearings and radioactive contamination particles that adhere to the magnets from entering the magnet chamber.Furthermore, this bearing structure makes maintenance easier. It also has a long bearing life, making it ideal as a pump for nuclear power plants.

Next, a first modification of the above embodiment of the present invention will be explained with reference to FIG. In FIG. 8, parts given the same reference numerals as those in FIG. 1 indicate the same or corresponding parts.

Also in this modification, the magnet pump has an impeller 4
A shaft 20 having a driven magnet 5 at both ends, a front bearing part 12 and a rear bearing part 13 that support the shaft freely in rotation, a pump case 1 which stores these inside and becomes a pressure vessel filled with pump handling liquid, and a magnet case. It consists of 2. Then, torque is transmitted to the driven magnet shaft 5 by the drive magnet shaft 6 connected to a drive motor (not shown), causing the driven magnet shaft 5 to rotate, and the rotation of the impeller 4 causes the handled liquid in the pump chamber Zi to move as indicated by the white arrow in the diagram. flows in the direction of On the other hand, in the middle part of shirts 1-20,
A separation chamber 5 formed between the bearing housing 3 and the magnet chamber separation wall 10 is provided. The liquid in the magnet chamber z2 is circulated in the direction of the arrow shown in the figure by the centrifugal force of the plurality of holes 11 formed in the radial direction of the driven magnet.

In this embodiment, this hole acts as an auxiliary impeller 11 for cooling the magnet room. This auxiliary impeller 1
The shape and mounting position of the impeller 1 are not limited to those in this embodiment, and the auxiliary impeller 11 may have the same blade shape as the impeller 4. Further, the auxiliary impeller 1] may be provided in a separate position from the driven magnet 5, for example, in the separation chamber 10.
and the front bearing part 12.

By the way, in the example shown in FIG. 8, in order to more perfectly separate the chamber Z2 into the pump chamber Z1 and the magnet L, the separation wall 10
A rubber glue seal 21 is provided at the portion.

Further, a slurry filter 22 is provided in the flow path of the liquid inside the magnet. This filter 22 is provided in at least one of the plurality of liquid supply holes 23 for the front bearing section 12, but it is not provided in all the liquid supply holes 23, so that in the unlikely event that the filter is clogged inside the hole 23. Even if it is filled with slurry (magnet chamber circulating fluid), the fluid supply to the front bearing section is not cut off.The liquid handled by the pump fills the magnet chamber Z2, so there is no flow into the magnet chamber. In this case, large particles with a diameter smaller than the dividing gap initially enter.

Furthermore, even during pump operation, some large-diameter particles may enter through the separation chamber 15. These large particles with a particle size of about 100 μm cause a large number of scratches when flowing on the bearing sliding surface, causing gradual progress of bearing wear. Therefore, the filter 22 traps the particles during their circulation, and prevents large-diameter particles from flowing in the magnet chamber over a long period of time and causing bearing wear.

Furthermore, in the example shown in FIG. 8, the magnet case 2 is provided with heat dissipation fins 2a, and the side wall of the drive magnet wheel 6 is cut out to form a cooling fan 6b that functions as an axial fan, so that the drive magnet rotates. At this time, the cooling air 2 is caused to flow by the fan 6b. With this configuration, even if the pump becomes large and heat generation inside the magnet increases, the cooling fan 6
The air blowing effect by b allows effective cooling.

FIG. 9 shows still another modification (second modification) of the embodiment shown in FIG. 1, and in this example, the front bearing 1
2 is provided on the pump chamber side of the pair link housing 3, and a separation wall 10 is provided on the driven magnet 5 side. In addition, a liquid supply hole 24 is provided in the pairing tool X Ujifugu 3 so as to communicate with the pump chamber Zz and the separation chamber 15, and the liquid handled in the pump chamber is guided into the separation chamber 15 through the oil supply hole 24, and the front bearing part 12 is After being lubricated, it is configured to return to the pump chamber Zl again. The rear bearing portion 13 is lubricated by forced lubrication by the auxiliary impeller 11, as in the example shown in FIG.

FIG. 10 shows a third modification of the embodiment shown in FIG. 1. In this example, a purge water inlet hole 2b is formed in the magnet case 2, and the purge water Y is introduced from this hole 2b into the magnet chamber z2. It was designed to be injected. Furthermore, in this example, a labyrinth seal 24 is provided at the shaft penetrating portion of the separation wall 10, so that the liquid handled in the pump chamber Zl is transferred to the magnet chamber Z.
The number of groups flowing into the second side is minimized.

Note that various other embodiments are possible. For example, part or all of the liquid discharged from the auxiliary impeller,
It may be introduced into a water-cooled heat exchanger (this heat exchanger is cooled by external cooling water or discharge liquid) or an air-cooled heat exchanger installed separately outside, and then returned to the auxiliary impeller suction port after being cooled.

A concrete example of this is shown in FIG. In this example, a water-cooled heat exchanger 25 is installed outside, and the liquid inside the magnet is cooled by cooling water 26.

In the modified example described above, as in the embodiment shown in FIG.
Since it is divided by , it is possible to reduce or prevent solid particles from entering the magnet chamber z2. Therefore, a large number of particles that are attracted to the driven magnet 5 do not accumulate in the magnet chamber, and it is possible to prevent damage caused by accumulation of contaminants during pump maintenance. Also,
The magnet chamber is equipped with an auxiliary impeller that forcibly circulates the magnet chamber fluid, cooling each bearing part.
The heat removed through lubrication can be released to the pump fluid or the atmosphere through the magnet case, bearing housing, pump case, etc.

In this way, according to this embodiment, it is possible to prevent the continuous flow of contaminant particles that are attracted by the magnet into the magnet chamber and the continuous flow of large-diameter particles that are harmful to the bearing, thereby improving maintainability and extending the life of the bearing. It's effective.

Note that the bearing is not limited to the dynamic pressure sliding type shown in this embodiment, but may be a static pressure sliding type or a ball rolling type.

〔Effect of the invention〕

According to the present invention, the pump chamber and the magnet chamber are separated, and the liquid in the magnet chamber is forcedly circulated by a forced circulation means such as an auxiliary impeller to lubricate the bearing part and cool the magnet chamber. The bearings installed in the bearings can be effectively lubricated.

In addition, in the present invention, the inside of the magnet chamber can be cooled by forced circulation of the liquid in the magnet chamber, so the magnet pump of the present invention can be applied to large-capacity pumps, has good maintainability, and can extend the life of the bearings. It has the effect of being measurable.

Furthermore, when the pump chamber and the magnet chamber are separated by the separation wall and the separation chamber, the life of the bearing provided in the magnet chamber can be extended.

[Brief explanation of drawings]

Fig. 1 is a vertical cross-sectional view of a magnetic chamber pump showing an embodiment of the present invention, Figs. Figure 3 is a perspective view of the rear radial bearing, Figure 4 is a perspective view of the rear sleeve, Figures 5 to 7 are diagrams of each component that makes up the front bearing, and Figure 5 is the front thrust. FIG. 6 is a perspective view of the front radial bearing, FIG. 7 is a perspective view of the fluorocarbon 1-sleeve, and FIGS. 8 to 11 are longitudinal sections showing modifications of the embodiment shown in FIG. 1. It is a front view. 1... Pump case, 2... Magnet case (magnet can), 3... Bearing housing, 4
... Impeller, 5... Driven magnet (import), 6.
... Drive magnet (shaft), 7... Magnet housing, 8... Motor, 10... Separation wall, 11...
Auxiliary impeller, 12°′°front bearing part, 13
...Rear bearing part, 15...Separation chamber, 21...
Lip seal, 22...filter, 24...labyrinth seal, 25...heat exchanger.

Claims (1)

[Claims] 1. A magnetic pump that handles liquid containing contaminant particles, comprising means for separating the inside of a pressure vessel of the magnetic pump into a pump chamber and a magnet chamber, and forcibly circulating the liquid in the magnetic chamber. A magnet pump characterized by comprising means for forcibly lubricating a magnet indoor bearing section. 2. A drive magnet connected to the drive motor, a driven magnet connected to the impeller via a shaft, a bearing rotatably supporting the shaft, and the impeller;
In a magnetic pump comprising a pump case and a magnet case that house a shaft, a driven magnet, and a bearing therein, and have a pump handling liquid inside to form a pressure vessel, a separation wall is provided between the impeller and the driven magnet. By isolating the driven magnet and bearing part in the pressure vessel from the impeller part, and providing an auxiliary impeller means rotated by the shaft in a chamber in which the driven magnet is provided, the liquid in this chamber is separated from the impeller part. A magnet pump, characterized in that the auxiliary impeller means supplies circulation to the bearing. 3. In claim 2, the auxiliary impeller means is formed by forming a hole extending in the radial direction in the driven magnet, and the shaft has one end of the hole and the other end of the hole constituting the auxiliary impeller means. A magnet pump characterized in that a through hole is formed at the inner diameter end, liquid in a magnet chamber is introduced through the through hole, and is supplied to an auxiliary impeller means, and the pressure is increased and supplied to a bearing part. 4. In claim 2 or 3, a separation chamber is formed between the impeller and the driven magnet by the separation wall, the shaft, and the bearing, and the liquid discharged from the auxiliary impeller means is A magnetic pump that forms a circulation path that leads to a separation chamber, supplies from there to the bearing section, and then flows back to the auxiliary impeller section. 5. Claims 2, 3, or 4, wherein bearings supporting the shaft are provided in magnet chambers on both front and rear sides of the driven magnet, and the liquid in the magnet chamber is pressurized by auxiliary impeller means, A magnet pump configured to form a circulation path that supplies water to both of the bearing parts and then returns to the auxiliary impeller part. 6. A magnetic pump according to any one of claims 2 to 5, characterized in that the liquid in the magnet chamber is pump handling liquid. 7. A driving magnet, a driven magnet connected to the impeller via a shaft, a bearing rotatably supporting the shaft, a pump case housing the impeller inside, and housing the driven magnet and bearing inside. a magnetic case; a separation wall that separates the inside of the pump case from the inside of the magnet case and allows the shaft to pass through the shaft; forcibly circulating the liquid inside the magnet case and supplying it to the bearing part; A magnetic pump equipped with forced circulation means for forcibly lubricating bearings. 8. The magnetic pump according to claim 7, wherein the forced circulation means is an auxiliary impeller rotated by the shaft. 9. The magnetic pump according to claim 7 or 8, characterized in that the forced circulation path of the forced circulation means is provided with a slurry filter that captures solid particles contained in the forcedly circulated liquid. . 10. In any one of claims 7 to 9, a heat exchanger for guiding and cooling the liquid discharged from the forced circulation means is provided, and the liquid cooled by the heat exchanger is delivered to the bearing part. A magnetic pump characterized by supplying. 11. The magnet pump according to claim 7, further comprising a sealing means for sealing a gap between the separation wall and the shaft. 12. A driving magnet section, a driven magnet section connected to the impeller via a shaft, a bearing supporting the shaft, a pump case housing the impeller, a magnet case housing the driven magnet section, and the pump. a separation wall that separates the inside of the case from the inside of the magnet case and through which the shaft passes; a means for forcibly circulating the liquid in the magnet case to lubricate the bearing section; A magnet pump having a hole formed therein, a fan formed in the airflow hole portion, and a heat dissipation fin formed on a side wall of a magnet case facing a side wall of the drive magnet portion. 13. A motor case according to claim 12, wherein a drive magnet case is provided on the outer peripheral side of the drive magnet part so as to cover the drive magnet, and a motor for rotating the drive magnet part is attached to the drive magnet case. Magnetic pump installed inside. 14. A pressure vessel constituted by a pump case and a magnet case and filled with pump handling liquid, an impeller and a driven magnet housed in the pressure vessel, and magnetically coupled to the driven magnet via the magnet case. a drive magnet that rotates the driven magnet and the impeller via the drive magnet; a magnet housing provided on the outer circumferential side of the drive magnet and attached to the pressure vessel; and a magnet housing provided to cover the drive machine. a drive case that is attached to the magnet housing; a separation wall that separates the inside of the pressure vessel into an impeller chamber and a magnet chamber; and a pump that forcibly circulates pump handling liquid in the magnet chamber and lubricates a bearing part in the magnet chamber. Magnetic pump with means. 15. Claim 14, wherein the pump means is an auxiliary impeller attached to a shaft connecting an impeller and a driven magnet, and a bearing supporting the shaft is provided between the separation wall and the driven magnet. The bearing part and the separation wall form a separation chamber, and a circulation path is formed in which the liquid pressurized by the auxiliary impeller is guided to the separation chamber, from where it is supplied to the bearing part, and then returns to the auxiliary impeller again. A magnetic pump that is characterized by: 16. The magnet pump according to claim 15, characterized in that a bearing part is provided on the inner periphery of the end of the driven magnet part, and the fluid pressurized by the auxiliary impeller is guided to this bearing part for lubrication. 17. In claim 14, the bearing is composed of a front bearing part provided between the driven magnet and the separation wall, and a rear bearing part provided on the inner peripheral side of the end of the driven magnet, The magnet pump is characterized in that each of the front and rear bearings includes a radial bearing part and a thrust bearing part. 18. In claim 17, the pump means is an auxiliary impeller formed in the driven magnet section, and guides the liquid discharged from the auxiliary impeller to each of the front and rear bearing sections, and A magnetic pump that forms a circulation path that leads from the bearing section back to the auxiliary impeller. 19. Claim 18, wherein the path for guiding the liquid discharged from the auxiliary impeller to the front bearing section is divided into two paths: a path to a radial bearing section of the front bearing section and a path to a thrust bearing section. What is claimed is: 1. A magnet pump characterized in that an orifice portion is provided in a discharge liquid path to a thrust bearing portion, and a radial groove is formed in a thrust bearing surface of the thrust bearing portion. 20. Claim 14, wherein a wind flow hole is formed in the drive magnet wheel side wall of the drive magnet and the magnet housing, and the motor cooling air is guided from the wind flow hole of the drive magnet wheel to the outer periphery of the magnet case. , a magnetic pump further comprising a cooling air flow path which is discharged to the outside through an air flow hole in the magnet housing. 21. A drive magnet, a driven magnet connected to the impeller via a shaft, a bearing that supports the shaft and is provided between the driven magnet and the impeller, and a drive magnet that supports the impeller, the shaft, the driven magnet, and the bearing inside. In the magnet pump, a separation wall is provided between the impeller and the bearing, a separation chamber is formed by the separation wall, the shaft and the bearing, and the separation wall and the magnet case include a pump case and a magnet case. A magnetic pump in which the inside of the pump case and the inside of the magnet case are separated by a separation chamber. 22. A drive magnet connected to the drive means, a driven magnet connected to the impeller via the shaft, a bearing that rotatably supports the shaft, and these are housed inside and filled with the liquid handled by the pump, forming a pressure vessel. In a magnetic pump having a pump case and a magnet case, the inside of the pressure vessel is separated into a pump chamber and a magnet chamber, and then the pump handling liquid in the magnet chamber is forcedly circulated and supplied to the bearing to lubricate the bearing. A lubrication method for a magnetic pump characterized by the following.