JPS62111183A - Rotary pump - Google Patents

Abstract

PURPOSE:To easily perform assembly, by positioning a bearing hole, cover forming a pump chamber, pump mechanism, shaft and a driven rotor while the second cover, bearing and a driving rotor, with respect to a base. CONSTITUTION:A cover 17, forming a pump chamber 16, is positioned in the upper surface of a base 11, while a trochoid pump mechanism 25, bearing hole 15 and a driven rotor 41 are positioned in the pump chamber 16. While a cover 45, shaft 47 and a driving rotor 49 are positioned in a groove 46 in the bottom surface of the base 11. Consequently, a pump can be assembled with no complicated shaft alignment work under a condition that an axial center line of the driving rotor automatically agrees with the axial center line of the driven rotor.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field of the Invention) The present invention relates to a zero-rotation type pump, and in particular, a magnetic force coupling is interposed between a one-rotation type pump mechanism and an electric motor that drives the pump mechanism. Concerning improvements to rotary pumps.

[Technical background of the invention and its problems]

A typical rotary pump consists of a pump mechanism and an electric motor that drives the pump mechanism.

In a rotary pump having such a structure, it is usually very difficult to completely seal the part where the pump mechanism and the electric motor are connected. For this reason.

For example, when used in a place where perfect sealing performance is required, such as in a refrigerant circulation system,9 the power of the electric motor is usually transmitted to the pump mechanism via a magnetic force coupling. Magnetic force couplings incorporated into this type of pump are generally.

Magnetic interference occurs between a drive rotor that is configured with a plurality of permanent magnets arranged in the circumferential direction and is driven by an electric motor, and a drive rotor that is placed opposite to the drive rotor with a partition wall made of non-magnetic material interposed therebetween. It consists of a driven rotor that rotates following the main rotor using suction force. Therefore, complete sealing can be achieved by the presence of the partition wall described above without impairing the one-turn force transmission function.

By the way, the conventional rotary pump in which a magnetic force coupling is interposed between the pump mechanism and the electric motor as described above usually has a driving rotor, which is one component of the magnetic force coupling, on the rotating shaft of the electric motor. The driven rotor and the pump mechanism, which are the other components, are housed in an airtight container that also serves as a partition wall.The driven rotor and the driving rotor are aligned to create a case for the electric motor. A structure that fixes it is adopted.

However, in the conventional rotary pump configured as described above, the axial center line of the driving rotor fixed to the rotating shaft of the electric motor and the axial center line of the driven rotor housed in a sealed container are completely separated. As a result, there was a problem in that the pump mechanism could not be operated satisfactorily due to torque fluctuations caused by shaft misalignment. Furthermore, it is structurally difficult to attempt to reduce the overall size, especially in the axial direction.

[Purpose of the invention]

The present invention has been made in view of the above circumstances, and its purpose is to align the driving rotor and driven rotor of the magnetic force coupling provided between the pump mechanism and the electric motor during assembly. It is an object of the present invention to provide a rotary pump that can be easily operated, thereby stably operating a pump mechanism, and contributing to overall miniaturization.

[Summary of the invention]

According to the present invention, a base, a bearing hole provided in the base, a first cover that is fixed to one surface of the base and forms a pump chamber with the base, and a first cover that is housed in the pump chamber. a rotary pump mechanism; a first shaft having one end connected to the pump mechanism in the pump chamber through the bearing hole provided in the base; and a permanent magnet fixed to the other end of the first shaft. a second cover positioned on the other surface of the base and fixed in a relationship surrounding the driven rotors; a second shaft protruding coaxially with the first shaft from the outer surface of the cover; a second shaft rotatably attached to the second shaft via a bearing; A main drive rotor having a plurality of permanent magnets in the circumferential direction that exert a magnetic attraction force between the permanent magnets of the driven rotor and forming a magnetic force coupling with the driven rotor; A rotary pump is provided having an electric motor for applying.

〔Effect of the invention〕

According to the present invention, each element is all positioned with respect to the above-mentioned base. That is, the bearing hole, the first cover forming the pump chamber, the rotary pump mechanism, the first shaft, and the driven O-tor are positioned with respect to the base. Also,
A second cover having the second axis is positioned relative to the base.

A driving rotor is positioned with respect to the second shaft via a bearing. Therefore, the axial center line of the driving rotor and the axial center line of the driven rotor can be automatically aligned in one normal assembly without performing complicated alignment work. Therefore, the pump mechanism can be rotated stably, and the bomb mechanism can exhibit good performance.

Further, since a bearing is interposed between the second shaft and the driving rotor, this bearing can also be used to support the rotor of the electric motor. As a result.

It can also contribute to overall miniaturization.

[Embodiments of the invention]

The present invention will be described in detail below with reference to two drawings.

FIG. 1 shows a rotary pump according to an embodiment of the present invention. This rotary pump is roughly composed of a pump body 1, an electric motor 2, and a magnetic force coupling 3 interposed between the electric motor 2 and the pump body 1.

The pump body 1 is constructed as follows. i.e. 9
In the figure, numeral 11 indicates a base that serves as a positioning reference for all elements. This base 11 is formed into a disc shape. A projecting circumferential wall 12, 13 is formed on the peripheral edge of the base 11 and protrudes in the vertical direction in the drawing, and a boss 14 is formed in the center part to project downward in the drawing. A bearing hole 15 is formed in the boss 14 in the vertical direction in the figure. A cover 17 that forms a flat pump chamber 16 between the upper surface of the base 11 and the projecting peripheral wall 12 is attached to the upper surface of the base 11 in the figure.
It is positioned and fixed liquid-tightly on the inner surface of the A sub-bearing hole 18 with a bottom is formed on the inner surface of the cover 17 at a position facing the bearing hole 15 . The cover 17 is provided with a suction port 19 and a discharge port 20 on both sides of the sub-bearing hole 18, and these suction port 19 and discharge port 20 are for suction, respectively. ! 21 and a discharge pipe 22. As shown in FIG. 2, the pump chamber 16 accommodates a trochoid pump mechanism 25 that is a combination of a large gear 23 and a small gear 24. In addition.

A groove 26 extending from the suction port 19 toward the sub-bearing hole 18 is formed between the suction port 19 and the sub-bearing hole 18 on the inner surface of the cover 17 . Groove 27 extending upwardly. It communicates with the upper am of the suction port 19 through a hole 28 formed in the cover 17 . Further, a groove 29 extending toward the bearing hole 15 is formed in the section from the position facing the suction port 19 to the bearing hole 15 on the upper surface of the base 11 in the figure;
It communicates with a groove 30 spirally bored on the inner surface of the. Further, a hole 31 penetrating vertically is formed in the base 11 at a position facing the suction port 19.

The magnetic force coupling 3 is constructed as follows. That is, the driven part 41 formed in the shape of a cylinder with a bottom is arranged so as to fit into the boss 14 through a small gap. A shaft 4 is attached to the so-called bottom wall of this driven rotor 41.
2 is fixed, and this shaft 42 is inserted into the bearing hole 15 until its upper end passes through the fitting hole 43 provided in the amount fII 1124 and reaches the inside of the sub-bearing hole 18. ing. A plurality of permanent magnets 44 magnetized to the illustrated polarity are embedded in the cylindrical portion of the driven rotor 41 at equal intervals in the circumferential direction. A cover 45 formed in the shape of a cylinder with a bottom is disposed on the outside of the driven rotor 41 so as to surround the driven rotor 41 with a small gap therebetween.

This cover 45 is made of a material that is non-magnetic and has a high specific resistance, and is positioned by a positioning groove 46 formed on the lower surface of the base 11 in the figure and fixed to the base 11 in a fluid-tight manner. There is. A shaft 47 is provided on the outer surface of the bottom wall of the cover 45, coaxially with the shaft 42, and protrudes downward in the figure. An inner race of a rolling bearing 48 is fixed to the outer periphery of the shaft 47, and a driving rotor 49 is fixed to the outer race of the rolling bearing 48. The driving rotor 49 has a cylindrical portion 50 extending downward from a portion supported by the rolling bearing 48, and a cylindrical portion 50 that once extends outward and then extends into a relationship in which it fits into the cover 45 through a small gap. It is composed of a large-diameter cylindrical portion 51 and a plurality of permanent magnets 52 embedded in this cylindrical portion 51 in a relationship facing the permanent magnets 44 on the driven rotor 41 side and magnetized to the polarities shown in the figure. There is.

On the other hand, in the electric motor t12, the one-rotation shaft 61 is fitted and connected to the cylindrical portion 50 of the main driving rotor 49, and the rolling bearing 4
8 and a stator 63 disposed outside the rotor 62. The stator 63 has a frame 64 formed in a cylindrical shape with a bottom.
is fixed on the inner surface of. Further, the base 11 is fixed to the opening of the frame 64 in such a manner as to close the opening.

With such a configuration, when the rotor 62 of the electric motor 2 rotates, this rotation is transmitted to the driving rotor 49. Therefore, the main drive rotor 49 rotates. A magnetic attraction force acts between the permanent magnet 52, which is attached to the driving rotor 49, and the permanent magnet 44, which is attached to the driven rotor 41.

When the main rotor 49 rotates, the driven rotor 41 also rotates. The rotation of the driven rotor 41 is transmitted to the small gear 24 of the trochoid pump mechanism 25 via the shaft 42. As a result, the small gear 24 rotates, the large gear 23 also rotates, and liquid is sucked in through the suction port 19 by the pump action caused by the rotation of the two gears 24 and 23, and this liquid is transferred to the discharge port 20.
sent from. Therefore, the pump functions here, and the presence of the cover 45 realizes a complete seal. Note that when the operating state is entered as described above, the grooves 26, 27. Hole 28, suction port 1
The liquid located on the suction side circulates through the path 9, which lubricates the sub-bearing hole 18.
9. The liquid located on the suction side circulates through the gap between the helical groove 30° base 11 and the driven rotor 41 and the path of the hole 31, thereby lubricating the bearing hole 15. Since this circulating flow of liquid is separated from the discharge side, it does not affect pump performance.

In this way, with the base 11 as a reference, the trochoid pump mechanism 25. The driven rotor 41 and the cover 45 are positioned, and the shaft 4 is attached to the cover 45.
A rolling bearing 4 is mounted on a shaft 47 that protrudes coaxially with
A configuration is adopted in which the driving rotor 49 can be positioned via the rotor 8. Therefore, when the above-mentioned types are sequentially assembled, the axial center line of the driven rotor 41 and the axial center line of the driving rotor 49 can be automatically aligned. For this reason,
It is possible to eliminate unstable operation of the trochoid pump mechanism 25 due to axis misalignment between the driven rotor 41 and the main drive rotor 49. In addition, a shaft 47 protruding from the cover 45
A rolling bearing 48 is attached to the main drive rotor 4.
9 is rotatably supported, the shaft 61 of the rotor 62 of the electric motor 2 is connected to the drive rotor 4 as in the embodiment.
9, the bearing on the electric motor 2 side can be omitted, thereby making it possible to reduce the overall size, and as a result, the above-mentioned effects can be achieved.

Note that the present invention is not limited to the embodiments described above. That is, in the embodiment described above, a trochoid pump mechanism is used as the pump mechanism.

Other rotary pump mechanisms may also be used. Furthermore, in the embodiment described above, the rotor 62 of the electric motor 2 is also supported by the rolling bearing 48 provided between the shaft 47 and the driving rotor 49, but the rotor 62 of the electric motor 2 is supported by another bearing. You can do it like this.

Alternatively, the rolling bearing 48 may be replaced with a sliding bearing. Further, in the embodiments described above, the permanent magnets on the driving rotor side and the permanent magnets on the driven rotor side are opposed to each other in a direction perpendicular to the axial direction, but they are opposed to each other in the axial direction.

In other words, it may be configured as an axial type. Furthermore, the number of permanent magnets on the driving rotor side and the driven rotor side may be one each.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of a rotary pump according to an embodiment of the present invention, and FIG. 2 is a view of the same pump cut along line A-A in FIG. 1 and viewed in the direction of the arrow. DESCRIPTION OF SYMBOLS 1... Pump body, 2... Electric motor, 3... Magnetic force coupling, 11... Base, 15... Bearing hole,
16... Pump chamber, 17... Cover for forming the pump chamber, 25... Trochoid pump side structure, 41... Driven rotor. 42... Shaft, 44... Permanent magnet on driven rotor side, 4
5... Cover surrounding the driven rotor, 47... Shaft,
48... Rolling bearing, 49... Drive rotor, 52
...Permanent magnet on the drive rotor side. Applicant's agent Patent attorney Takehiko Suzue Figure 1 Figure 2

Claims (4)

[Claims] (1) A base, a bearing hole provided in the base, a first cover fixed to one surface of the base and forming a pump chamber with the base, and a rotary pump housed in the pump chamber. a pump mechanism; a first shaft having one end connected to the pump mechanism in the pump chamber through the bearing hole provided in the base; and a permanent magnet fixed to the other end of the first shaft in a circumferential direction. a driven rotor arranged in the
a second surface positioned by the other surface of the base and fixed in surrounding relation to the driven rotor;
a second shaft coaxially protruding from the outer surface of the second cover; a second shaft rotatably attached to the second shaft via a bearing; a main drive rotor, which has permanent magnets in the circumferential direction that apply a magnetic attraction force between the permanent magnets of the driven rotor through the second cover, and constitutes a magnetic force coupling with the driven rotor; A rotary pump characterized by comprising an electric motor that applies rotational force to a driving rotor. (2) The rotation according to claim 1, wherein the bearing interposed between the second shaft and the driving rotor also serves as a bearing that supports the rotor of the electric motor. formula pump. (3) The rotary pump according to claim 1, wherein the driving rotor and the driven rotor are provided with their respective permanent magnets facing each other in a direction orthogonal to an axial direction. . (4) The rotary pump according to claim 1, wherein the driving rotor and the driven rotor are provided with their permanent magnets facing each other in the axial direction.