JPH0742869U - Centrifugal pump - Google Patents

Abstract

(57) [Summary] [Purpose] To enable efficient transmission of motor driving force. [Structure] The pump case 11 of the centrifugal pump has a partition wall 17
Is divided into an impeller chamber 18 and a drive chamber 19. An impeller 22 is housed in the impeller chamber 18, and a magnet 27 incorporated in the impeller 22 is covered and held on the partition wall 17 side by a holding plate 28 made of a nonmagnetic thin metal material. As a result, the distance between the magnet 27 and the magnet 32 of the motor 12 arranged in the drive chamber 19 is shortened.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a centrifugal pump, and more particularly, to a centrifugal pump that enables downsizing of its impeller chamber.

[0002]

[Prior art]

 Conventionally, in a centrifugal pump, for example, as shown in FIG. 3, an impeller side case 1 and a drive side case 2 are integrally connected via a partition wall 3 to form an impeller chamber 4 and a drive chamber 5. It is known that an impeller 7 including a magnet 6 is rotatably accommodated in the impeller chamber 4 while a magnet 9 fixed to a main shaft 8a of a motor 8 is accommodated in the drive chamber 5 (special feature). (See Japanese Laid-Open Patent Publication No. 62-292114, etc.).

The impeller 7 is made of a resin material, and is composed of a tubular body 7b in which the blades 7a are formed and the magnet 6 is accommodated, and a lid body 7c which closes the open end of the tubular body 7b. And both are integrated by heat welding or ultrasonic welding.

In such a centrifugal pump, the driving force of the motor 8 is converted into the rotational force of the impeller 7 through the magnets 9 and 6 in a non-contact manner to waterproof the motor 8 side. The blade 7a of the impeller 7 causes the liquid to flow.

[0005]

[Problems to be solved by the device]

 However, in the above-mentioned conventional centrifugal pump, since the impeller 7 is made of a resin material, the distance between the magnet 6 built in the impeller 7 and the magnet 9 fixed to the motor 8 is large. That is, the impeller 7 must be formed with a constant thickness in order to ensure sufficient resin flow during injection molding and to obtain a predetermined strength after molding. Therefore, there is a problem that the driving force of the motor 8 cannot be sufficiently converted into the rotational force of the impeller 7, and thus the performance of the motor 8 cannot be utilized to the maximum.

Further, since the tubular body 7b and the lid body 7c constituting the impeller 7 are integrated by thermal welding or the like, the welding state may be insufficient, but it is difficult to detect the welding failure. there were. In view of the above problems, it is an object of the present invention to provide a centrifugal pump that can efficiently transmit the driving force of a motor.

[0007]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention integrates and integrates an impeller-side case and a drive-side case through a partition wall, and rotatably accommodates an impeller having a magnet on the side opposite to the blade in the impeller-side case. On the other hand, in a centrifugal pump in which a magnet fixed to a main shaft of a motor is arranged in the drive side case, and both magnets are magnetically coupled to each other, a holding plate made of a nonmagnetic thin metal material on at least the partition wall side of the impeller. It is coated with.

[0008]

【Example】

 Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a front sectional view of a centrifugal pump according to this embodiment, and FIG. 2 is an exploded perspective view thereof. This centrifugal pump has a structure in which a motor 12 is attached to a pump case 11. The pump case 11 comprises an impeller-side case 13 and a drive-side case 14, which are superposed and fixed by bolts and nuts 15a and 15b. It is divided into an impeller chamber 18 and a drive chamber 19.

A suction pipe 20 and a discharge pipe 21 communicate with the impeller chamber 18, and an impeller 22 is arranged inside. The impeller 22 is substantially disk-shaped, and in the upper surface of FIG. 2, blades 23 are provided at four equal parts, and a boss portion 24 is projectingly provided at the center thereof. The boss portion 24 is brought into contact with the pressing shaft 25 extending from the inner wall of the suction pipe 20 to prevent the impeller 22 from floating during rotation.

Further, a donut-shaped recess 26 is formed on the bottom surface of the impeller 22, and an annular magnet 27 is disposed therein, and a holding plate 28 is attached so that the magnet 27 is removed from the recess 26. It is prevented from falling off and is protected from damage.

The holding plate 28 is obtained by pressing a thin plate made of a non-magnetic metal material such as an austenitic stainless steel into a substantially cylindrical shape having an opening only at the upper side. As described above, the reason why the non-magnetic material is used for the holding plate 28 is that the magnetic force generated from the magnet 27 is dispersed in the case of the magnetic material, and the metal material is used. This is to keep the thickness thinner than the resin material. Specifically, in the past, for example, polysulfone had a thickness of 0.8 mm or more, but in the present embodiment, while maintaining the hot water resistance, the thickness should be suppressed to 0.1 to 0.5 mm. I was able to.

Further, bent portions 29 are extended at eight equal portions on the opening edge portion of the holding plate 28, and the bent portions 29 are bent when the holding plate is attached to the impeller 22. It is adapted to be locked to the upper edge of 22. As a result, the holding plate 28 can be attached to the impeller 22 more reliably than with conventional heat welding or the like, and furthermore, the attachment state can be easily detected by visual inspection (a sensor) or the like.

A bearing recess 30 is formed in the center of the bottom surface of the holding plate 28, and a shaft member rotatably disposed in a bearing recess 17 a formed in the center of the partition 17 at one end thereof. The other end of 31 is located. As a result, the impeller 22 is rotatable within the impeller chamber 18.

On the other hand, the drive chamber 19 is provided with a magnet 32 attached to the main shaft 12 a of the motor 12. Specifically, the magnet 32 is fixed to a magnet mount 33, and the main shaft 12a of the motor 12 is inserted into a through hole 33a formed at the center of the magnet mount 33, and is fixed by a screw 34 from the side. Has become. In this case, since the magnet 27 of the impeller 22 is held by the holding plate 28 made of a non-magnetic metal material, which is much thinner than the conventional resin-coated one, the magnet 32 attached to the motor 12 is retained. It is possible to make them very close to each other, and the two magnets 27 and 32 are magnetically coupled in a very close state.

In the centrifugal pump having the above structure, when the motor 32 is driven to rotate the magnet 32 fixed to the main shaft 12a of the centrifugal pump, as described above, the magnet 27 of the impeller 22 is magnetically coupled in a very close state. Therefore, the driving force of the motor 12 is effectively transmitted to the impeller 22. Therefore, it is possible to efficiently supply the liquid by the impeller 22 while suppressing the power consumption of the motor 12.

In the above-described embodiment, the holding plate 28 is attached to the impeller 22 by forming the bent portion 29 in the holding plate 28. However, an engaging groove is formed on the side surface circumference of the impeller 22. Other fixing methods such as forming and swelling the side surface of the holding plate 28 inward and caulking and fixing may be used.

[0017]

[Effect of device]

 As is clear from the above description, according to the centrifugal pump of the present invention, at least the partition wall side of the impeller is covered with the holding plate made of a non-magnetic thin metal material. The distance between the motor and the magnet on the motor side can be shortened, and the driving force of the motor can be effectively converted into the rotational force of the impeller. In addition, since the holding plate is made of a thin metal material, it can be mechanically attached to the impeller by locking or the like, the attachment state becomes reliable, and the confirmation can be easily performed.

[Brief description of drawings]

FIG. 1 is a front sectional view of a centrifugal pump according to an embodiment.

FIG. 2 is an exploded perspective view of FIG.

FIG. 3 is a front sectional view of a centrifugal pump according to a conventional example.

[Explanation of symbols]

11 ... Pump case, 12 ... Motor, 17 ... Partition, 18
... impeller chamber, 19 ... driving chamber, 22 ... impeller, 27,
32 ... Magnet, 28 ... Holding plate.

Claims (1)

[Scope of utility model registration request] 1. An impeller-side case and a drive-side case are integrally connected via a partition wall, and the impeller-side case is
A centrifugal pump in which an impeller equipped with a magnet on the side opposite to the blade is rotatably accommodated, while a magnet fixed to the main shaft of a motor is disposed in the drive side case, and both magnets are magnetically coupled, A centrifugal pump, wherein at least the partition wall side of the impeller is covered with a holding plate made of a non-magnetic thin metal material.