JPH0842483A - Canned motor pump - Google Patents

Abstract

PURPOSE:To prevent a partition wall from cracking or deforming, also reduce air gaps, and improve motor efficiency, pump efficiency, and the life of a motor. CONSTITUTION:One of two chambers partitioned with a partition wall 27 is set to be a motor chamber 21, and the other is set to be a pump chamber 28 to which cooling water L is fed. In the motor chamber 21, a plurality of cores 23 wound with stator coils 25 are radially arranged. In the pump chamber 28, an impeller 30 rotationally movably held is arranged, in which rotor magnets 32 are arranged on the back so as to oppose to a plurality of the cores 23. The extreme end 23a of each core 23 fittingly penetrates the partition wall 27 and exposed to the pump chamber 28.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a canned motor pump usable as a water pump or the like arranged in a cooling circuit of an automobile.

[0002]

2. Description of the Related Art Conventionally, as a canned motor pump,
The one shown in FIG. 3 is known (Actual exploitation number 59-5209).
No. 1, gazette of Japanese Utility Model Publication No. 5-21197, etc.).

In this canned motor pump P0, one of two chambers separated by a partition wall 7 is a motor chamber 1 surrounded by a motor casing 2, and the other is a pump chamber surrounded by a pump casing 9 for supplying fluid. It was configured as chamber 8.

A plurality of cores 3 around which a stator coil 4 is wound are radially arranged in the motor chamber 1, and a rotor magnet 12 is arranged on the back surface of the pump chamber 8 so as to face the cores 3. The impeller 10 movably held is arranged, and the fluid suction port 9a and the fluid discharge port 9b are arranged.

Reference numeral 11 denotes a shaft fixed to the impeller 10, and the shaft 11 is rotatably supported by a bearing 5 held in a motor casing 2 of the motor chamber 1.

In this pump P0, since the partition wall 7 is brought into close contact with the tip of the core 3 and is supported by the tip of the core 3,
Since the strength of the partition 7 can be improved and the distance between the tip of the core 3 and the rotor magnet 12, that is, the distance of the air gap A can be shortened, the motor efficiency can be improved.

[0007]

However, in the conventional pump P0, it is conceivable to reduce the thickness of the partition wall 7 in order to further improve the motor efficiency. However, if the partition wall 7 is thinned, the core is reduced. Since the strength of the non-adhered portion of 3 is reduced, the partition wall 7 may be broken, and the fluid in the pump chamber 8 may flow into the motor chamber 1 to damage the motor portion. Further, the partition wall 7 may be deformed by heat or the like and come into contact with the rotor magnet 12 in some cases.

Particularly, when the pump P0 is used as a water pump arranged in an automobile, the partition wall 7 is more likely to be cracked or deformed due to engine vibration, vehicle body vibration, or deformation due to heat. I will end up.

The present invention is intended to solve the above-mentioned problems, and can prevent cracks and deformations of partition walls, reduces the air gap, and improves motor efficiency, pump efficiency, and motor life. It is an object to provide a motor pump.

[0010]

The pump according to the present invention comprises:
One of the two chambers separated by a partition is a motor chamber, and the other is a pump chamber for feeding a fluid.
A plurality of cores wound with a stator coil is radially arranged, and an impeller rotatably held by a rotor magnet arranged on the back surface is arranged in the pump chamber so as to face the plurality of cores. A canned motor pump is provided, wherein the tip of each core is exposed in the pump chamber by inserting the partition wall.

It is desirable that the tip of each core is projected into the pump chamber, and the surface of the portion of each core exposed in the pump chamber is made of a material having good wear resistance and corrosion resistance. It is desirable to form it from.

[0012]

In the canned motor pump according to the present invention, even if the partition wall is made sufficiently thick so as to ensure a predetermined strength, the core tips are exposed in the pump chamber, so that the air volume is independent of the partition wall thickness. The gap can be shortened. Further, if the core projects into the pump chamber, the air gap can be further shortened.

Further, since the tip of each core is exposed in the pump chamber, the core is cooled by the fluid flowing in the pump chamber, and the cooling effect becomes more effective as the core projects into the pump chamber. . Then, if each core is cooled, the stator coil is also indirectly cooled,
The life of the motor (stator coil) can be extended.

Further, if the tip of each core exposed in the pump chamber is made of a material having good wear resistance and corrosion resistance, the wear and corrosion of the core due to the fluid flowing through the pump chamber can be prevented. As a result, it is possible to prevent an increase in the air gap and prevent a decrease in the sealing property with the partition wall, and it is possible to maintain the above-described action for a long period of time.

Furthermore, since each core tip is disposed so as to be exposed to the pump chamber, each core tip is fitted into the partition wall, and the positional accuracy of the arrangement of the stator coil wound around each core is improved. Can be improved.

[0016]

An embodiment of the present invention will be described below with reference to the drawings.

The canned motor pump P1 of the embodiment, as shown in FIG. 1, has one of two chambers separated by a partition 27,
A motor chamber 21 surrounded by a motor casing 22 is formed, and the other is formed as a pump chamber 28 surrounded by a pump casing 29 to supply the cooling water L.

The partition wall 27 is made of aluminum, ceramic,
It is made of non-magnetic material such as glass and synthetic resin.
As shown in FIG. 2, a through hole 27a into which a boss 22a of the motor casing 22 described later is fitted is formed in the center, and four cores 23 described later are formed on the periphery of the through hole 27a.
A through hole 27b into which the front end 23a of the above is inserted is formed.

The thickness t of the partition wall 27 is set to a thickness that allows sufficient strength in consideration of the discharge pressure of the pump P1, vibration of the engine and vehicle body, thermal deformation, and the like.

In the motor chamber 21, four cores 23 of a magnetic material wound with a stator coil 25 are radially arranged and fixed. Each core 23 is formed of a magnetic material having wear resistance and corrosion resistance, such as electromagnetic stainless steel (trade name “KM35” manufactured by Tohoku Special Steel), and each core 23 is fitted into the through hole 27b of the partition wall 27 and has a tip. 23 a is projected into the pump chamber 28. In addition, in order to improve the sealing property between each core 23 and the partition wall 27, a sealing material such as an O-ring may be separately provided.

Between each core 23 and the stator coil 25, a bobbin 24 having a collar 24a made of a non-magnetic material or a resin material is disposed so as to be mounted on the outer peripheral surface of the core 23. The bobbin 24 serves as a member that supports the partition wall 27 by contacting both ends thereof with the motor casing 22 and the partition wall 27. In addition, when the partition wall 27 and the bobbin 24 are not brought into contact with each other, or when the bobbin 24 is not provided, the through hole 27b is provided in the core 23 itself to support the partition wall 27.
You may form the step surface which contacts a peripheral edge.

In the motor casing 22 of the motor chamber 21, a boss 22a which is fitted into the through hole 27a of the partition wall 27 is formed in the center, and the shaft 31 is rotated by interposing the bearing 26 in the boss 22a. Held possible.

An impeller 30 is disposed in the pump chamber 28. On the back surface of the impeller 30, an annular permanent magnet magnetized with an NS pole in the circumferential direction so as to face each core 23 is formed. The rotor magnet 32 is fixed.

Further, the impeller 30 has a shaft 31 fixed thereto, and the shaft 31 is rotatably held by the boss 22a with the bearing 26 interposed as described above.

In the pump P1 of this embodiment, when each stator coil 25 is energized, each stator coil 25 is excited, the rotor magnet 32 rotates, and the impeller 30 rotates together with the rotor magnet 32, thereby cooling. The water L is sucked through the suction port 29a and discharged through the discharge port 29b.

At this time, since each core 23 projects into the pump chamber 28, the air gap A can be shortened and the magnetic flux density acting on the rotor magnet 32 of the stator coil 25 can be increased. Therefore, the motor efficiency can be improved, the rotational torque of the impeller 30 can be increased, and the pump efficiency can be improved.

On the other hand, since each core tip 23a is exposed in the pump chamber 28, the short air gap is shortened even if the thickness t of the partition wall 27 itself is sufficiently thick so as to ensure a predetermined strength. Therefore, the partition wall 27 can be prevented from being damaged or deformed.

Further, since each core tip 23a is exposed in the pump chamber 28, the core 23 is cooled by the cooling water L flowing in the pump chamber 28, and the cooling action is the core 2
The more the 3 projects into the pump chamber 28, the more effective it is. When each core 23 is cooled, the stator coil 25 is also indirectly cooled, and the life of the stator coil 25 can be extended.

Furthermore, since each core 23 is formed of a magnetic material having good wear resistance and corrosion resistance, it is possible to prevent wear and corrosion of the core 23 due to the cooling water L flowing in the pump chamber 28. Even if it is used for a long period of time, it is possible to prevent the above-mentioned actions and effects from being reduced.

Furthermore, each core tip 23a has a partition wall 27.
Since each of the cores 2 has a structure to be inserted into the through hole 27b of
The arrangement position of No. 3 is regulated, the accuracy of the arrangement position of the stator coil 25 wound around each core 23 can be improved, and uneven torque and uneven rotation of the impeller 30 can be prevented.

In the embodiment, the core 23 itself is made of a magnetic material having good wear resistance and corrosion resistance.
The surface of the tip 23a of each core 23 (at least the pump chamber 2
A plating layer such as zinc plating having good wear resistance and corrosion resistance may be formed on the surface of the portion protruding to the 8 side).
By the way, when the plating layer is formed, it may be formed on the entire outer surface of the core 23.

Further, in the embodiment, the motor section is a 4-pole type in which four cores 23 wound with the stator coil 25 are arranged, but the motor section has a plurality of arbitrary pole numbers such as two poles. Can be composed of

Further, in the embodiment, the tip 2 of each core 23 is
Although the case where 3a is projected into the pump chamber 28 is shown, the tip 23a may be exposed in the pump chamber 28 so as to be flush with the partition wall 27. Incidentally, in this case, if the partition wall 27 itself is brought close to the rotor magnet 32, or if the rotor magnet 32 is brought close to the partition wall 27,
The air gap A can be reduced.

Furthermore, in the embodiment, the shaft 31 of the impeller 30 is rotatably supported on the motor casing 22 side, but the shaft 31 may be supported on the pump casing 29 side. good.

[0035]

In the canned motor pump according to the present invention, even if the partition walls are made sufficiently thick so as to ensure a predetermined strength, the tips of the cores are exposed in the pump chamber. The air gap can be shortened, the partition wall can be prevented from cracking or deforming, and the motor efficiency and pump efficiency can be improved. Further, if the core projects into the pump chamber, the air gap can be further shortened, and the motor efficiency and pump efficiency can be improved.

Further, since the tip of each core is exposed in the pump chamber, the core is cooled by the fluid flowing in the pump chamber, and the cooling action becomes more effective as the core projects into the pump chamber. . Then, if each core is cooled, the stator coil is indirectly cooled,
The life of the motor (stator coil) can be extended.

If the tip of each core exposed in the pump chamber is made of a material having good wear resistance and corrosion resistance, wear and corrosion of the core due to the fluid flowing in the pump chamber can be prevented. Therefore, even if it is used for a long period of time, it is possible to prevent the above effects from being reduced.

Further, since each core tip is disposed so as to be exposed to the pump chamber, each core tip is fitted and inserted into the partition wall, so that the arrangement position accuracy of the stator coil wound around each core is improved. It can be improved and the assembling work becomes easy.

[Brief description of drawings]

FIG. 1 is a sectional view of a canned motor pump showing an embodiment of the present invention.

FIG. 2 is a partially cutaway perspective view showing members around the partition wall of the embodiment.

FIG. 3 is a cross-sectional view showing a conventional example.

[Explanation of symbols]

 1.21 ... Motor chamber, 3.23 ... Core, 4.25 ... Stator coil, 7.27 ... Partition wall, 8.28 ... Pump chamber, 10.30 ... Impeller, 12.32 ... Rotor magnet, L ... ( Fluid) Cooling water, P0 / P1 ... Canned motor pump.

Claims (3)

[Claims] 1. One of the two chambers separated by a partition wall is a motor chamber, and the other is a pump chamber for supplying a fluid. In the motor chamber, a plurality of cores wound with a stator coil are radially formed. A canned motor pump, wherein an impeller is provided in the pump chamber, the impeller rotatably held with a rotor magnet disposed on a back surface of the pump chamber so as to face the plurality of cores. A canned motor pump, wherein the tip of each core is exposed in the pump chamber by inserting the partition wall. 2. The canned motor pump according to claim 1, wherein the tip of each core projects into the pump chamber. 3. The canned motor according to claim 1, wherein a surface of a portion of each core tip exposed in the pump chamber is formed of a material having good wear resistance and corrosion resistance. pump.