JPS62147095A - Magnet driven pump - Google Patents

Abstract

PURPOSE:To improve cooling efficiency with a simple structure by providing a partition board which extends from the inner peripheral part of a motor casing toward a rotor shaft center along a fan structure body, and generating a centrifugal flow of air by means of said structure body, and generating a centrifugal flow of air by means of said structure body surrounded by said board. CONSTITUTION:In a pump casing 20, a partition board 60 which is extended from the inner peripheral surface of a motor casing 30 toward the center of a rotor shaft 36 by a defined dimension, is provided close to and along a fan structure body 46 which is formed on the supporting body 42 of driving magnets 40 installed on the rotor shaft 36. Vent holes 48 are provide on the rear end face of the motor casing 30 while an exhaust port 62 is provided on one side of the motor casing 30 adjacent to a pump part 10 which is partitioned by the partition board 60. Due to this structure, a centrifugal flow of air is produced in the motor casing 30 surrounded by the partition board 60 during operation, eliminating the need for providing an exclusive cooling fan, etc. on the rotor shaft 36. Accordingly, the smooth circulation cooling of a motor part 12 can be achieved, enabling a device to be made small and compact.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a magnet-driven pump that uses a magnetic coupling to drive the pump, and in particular to a magnet-driven pump that can efficiently cool a drive motor with a simple configuration. This invention relates to a driven pump.

[Prior Art] Conventionally, magnetic couplings have been used as a means of transmitting the power of the drive motor to the pump impeller, thereby eliminating the need for the motor drive shaft to penetrate the pump section and preventing shafts such as mechanical seals. It is suitable for various uses because it does not require sealing means and does not cause liquid leakage.

However, in this type of pump, it is necessary to efficiently cool the motor part, taking into account the negative thermal effects on the magnetic coupling, as the pump handles high-temperature liquid. From this point of view, structures in which various cooling fans are incorporated in the motor section have been proposed and put into practice.

For example, FIG. 2 shows one configuration of a magnet-driven pump with a typical conventional cooling fan structure. That is, in FIG. 2, reference numeral 10 indicates a pump section and 12 indicates a motor section. Pump section 10 and motor section 1
2 is liquid-tightly partitioned from the pump casing 2 by a partition wall 14, and the pump part 10 is equipped with a suction port 16 and a discharge port 18.
The impeller 26 is rotatably attached to an independent pump shaft 28 inside the pump chamber 22 surrounded by a pump chamber 22 and a driven magnet 24. In addition, the motor section 12
is a stator assembly 3 supported by a motor casing 30.
2 and a rotor assembly 34, which rotatably holds both ends of a rotor shaft 36 in the center of the motor casing 30 via bearings 38.
Furthermore, a support body 42 having a drive magnet 40 attached thereto is coupled to one end of the rotor shaft 36 so as to face the driven magnet 24 provided in the pump section 10 . However, the magnet-driven pump configured in this manner has fan structures 44 and 44 on both end surfaces of the rotor assembly 34, respectively.
A fan structure 46 is also provided on the support body 42 of the drive magnet 40, and when the rotor assembly 34 rotates, outside air is sucked in from the ventilation hole 48 formed in the rear end surface of the motor casing 30, and the fan structure 46 is provided on the support body 42 of the drive magnet 40. It is configured to exhaust air through a ventilation hole 50 formed on the outer circumferential side surface adjacent to 20.

FIG. 3 shows another configuration example of the conventional magnet-driven pump, in which instead of providing fan structures 44 and 44 on both end surfaces of the rotor assembly 34, fan structures 44 and 44 are provided at the rear of the rotor shaft 36. A dedicated cooling fan 52 is provided at the end.

[Problem that the invention seeks to solve]

However, in the conventional magnet-driven pump described above, which is provided with a fan structure on both end faces of the rotor assembly as shown in Fig. 2, it merely stirs the air inside the motor casing, and the cooling efficiency is reduced. The disadvantage is that it does not allow for good air circulation. Also, the third
As shown in the figure, by providing an independent cooling fan on the rotor shaft, it is possible to achieve efficient airflow circulation, but this not only increases the size of the motor structure but also increases the driving force of the cooling fan. This requires an output of the motor including the motor, which not only increases the overall structure of the motor section but also increases the operating cost.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a rotor assembly with a simple and compact structure without providing a fan structure or an independent cooling fan, and with extremely high cooling efficiency. An object of the present invention is to provide a magnet-driven pump that can constitute a motor section.

[Means for solving problems]

The magnet-driven pump according to the present invention includes a pump section and a motor section, the pump section and the motor section are liquid-tightly partitioned by a partition wall, a support body for supporting a drive magnet is provided on the rotor shaft of the motor section, and the pump section is In a magnet-driven pump in which an impeller is rotatably provided with a driven magnet in the motor part, a fan structure is provided in a part of the support body of the motor part, and the inner peripheral part of the motor casing is disposed along the fan structure. The present invention is characterized in that a partition plate is provided extending from the center toward the center of the rotor axis, and a fan structure surrounded by the partition plate generates a centrifugal flow of air.

In this case, a ventilation hole is formed in the rear end surface of the motor casing of the motor section, and an exhaust hole is formed in one side surface of the motor casing corresponding to the outer circumference of the fan structure of the support body partitioned by the partition plate.

[Effect]

According to the magnet-driven pump of the present invention, the fan structure is provided in a part of the support body that supports the drive magneto 1- with respect to the rotor shaft of the motor section, and the fan structure is surrounded along the fan structure. A partition plate is provided inside the motor casing, and the rotation of this fan structure generates a suitable centrifugal flow of air inside the motor casing, thereby achieving smooth circulation of cooling air flow, and at low cost. A small magnet-driven pump with excellent performance can be easily obtained.

〔Example〕

Next, embodiments of the magnet-driven pump according to the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 is a sectional side view of a main part of an embodiment of the magnet-driven pump of the present invention. For convenience of explanation, the same components as those of the conventional magnet-driven pump shown in FIGS. 2 and 3 will be described with the same reference numerals.

In FIG. 1, the basic construction of a pump section 10 and a motor section 12 of the magnet-driven pump of this embodiment is the same as that of the conventional pump shown in FIG.

4-The pump part 10 and the motor part] 2 refers to the partition wall 14
The pump part 10 is sealed in a liquid-tight manner by the inlet 19.
An impeller 26 has a pump casing 20 having a G and a discharge port 18, and has a driven magnet 24 integrally provided inside a pump chamber 22 formed inside this pump casing 20, and is rotatable around a pump shaft 28. installed on.

The motor section 12 also includes a stator assembly 32 and a rotor assembly 34, and a rotor shaft 36 of the rotor assembly 34 is supported by the pump casing 30 together with the stator assembly 32 via bearings 38.38. A support body 42 is provided with a drive magnet 40 at its tip.

However, the magnet-driven pump according to the present invention is similar to the prior art in that a fan structure 46 is provided to the support 42 of the drive magnet 40. In particular, in the pump of the present invention, a partition plate is provided close to the fan structure 46 of the support body 42 and extends along the fan structure 46 by a predetermined dimension from the inner peripheral surface of the motor casing 3° toward the center of the rotor shaft 36. 60 is provided. In this case, a ventilation hole 48 is formed in the rear end surface of the motor casing 30, and an exhaust hole 62 is formed in one side surface of the motor casing 30 adjacent to the pump section 10 partitioned by a partition plate 60. The partition plate 60 is preferably made of a material with excellent electrical insulation and heat resistance, such as Bakelite or glass fiber material.

In the magnet-driven pump configured in this way, when driving the motor section 12, the support body 4 of the drive magneto 1-40 is
2 rotates, a centrifugal flow of air is generated in the front part of the motor casing 30 surrounded by the partition plate 60, and as a result, an air flow in a fixed direction as shown in the figure is generated in the rear part of the motor casing 30. . Therefore, according to the present invention, it is not necessary to provide a fan structure on the rotor assembly 34 of the motor section 12 or to provide a dedicated cooling fan on the rotor shaft 36 (to achieve smooth circulating cooling of the motor section 12). can.

〔Effect of the invention〕

As is clear from the embodiments described above, according to the present invention,
By providing a partition plate 60 inside the pump casing along the fan structure configured on the support 42 of the drive magnet 40 attached to the rotor shaft, a very effective centrifugal flow of air can be generated inside the motor casing. As a result, smooth and efficient circulation of cooling air can be achieved without providing a special fan structure or cooling fan for the motor section.

Therefore, according to the pump of the present invention, the structure of the motor part can be downsized to the minimum necessary size, and the heat generated at that time can be efficiently removed, thereby improving the durability of this type of pump. Manufacturing costs can be easily reduced.

The configuration of the pump of the present invention is similar to that shown in FIGS. 2 and 3.
It can be immediately applied to existing pumps as shown in the figure, and this improves the circulation efficiency of cooling air flow within the motor casing, which could not be achieved with conventional pumps, contributing to improved performance of the motor section. be able to.

Although the preferred embodiments of the present invention have been described above, it goes without saying that various design changes can be made without departing from the spirit of the present invention.

[Brief explanation of drawings]

FIG. 1 shows a magnet-driven bong according to the present invention. FIG. 2 is a side sectional view of the main part showing an example of a conventional magnet-driven pump; FIG. 3 is another example of a conventional magnet-driven pump. FIG. 10. Pump part 12. , , motor section 1
4. Bulkhead 16. ,,Suction port 18, ,
, discharge port 20. ,, pump casing 22)
,, pump room 24. ,,driven magnet 26,
,, Impeller 28. ,,pump shaft 30,,,motor casing 32. ,, Stator assembly 34, , Rotor assembly 36. ,,rotor shaft 38,,,hair ring 40. ,, drive magnet 42),, support body
44. , , Fan structure 46 , , Fan structure 48. ,,Vent hole 50,,,Vent hole
52. ,,cooling fan 60,,,partition plate 6
2. , , Exhaust hole patent applicant Nikkiso Eiko Co., Ltd. - Utsuheli

Claims (2)

[Claims] (1) Consisting of a pump part and a motor part, the pump part and the motor part are liquid-tightly partitioned by a partition wall, a support body for supporting a driving magnet is provided on the rotor shaft of the motor part, and a driven magnet is provided in the pump part. In a magnet-driven pump in which an impeller is rotatably provided, a fan structure is provided in a part of the support body of the motor section, and a fan structure is provided along the fan structure from the inner circumference of the motor casing toward the center of the rotor axis. 1. A magnet-driven pump comprising an extending partition plate and a fan structure surrounded by the partition plate to generate a centrifugal flow of air. (2) In the magnet-driven pump according to claim 1, a ventilation hole is provided in the rear end surface of the motor casing of the motor part, and in the outer periphery of the fan structure of the support body partitioned by a partition plate. A magnet-driven pump with an exhaust hole drilled on one side of the corresponding motor casing.