JPH0754636Y2 - Magnet pump - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Industrial Field of the Invention The present invention relates to a magnet pump used for feeding hot water or a chemical solution.

2. Description of the Related Art First, an example of a conventional magnet pump will be described.
In FIG. 4, 31 is a winding part composed of a plurality of coils, 32
Is a stator core configured to stack a plurality of steel plates and holding the winding portion 1. Reference numeral 33 denotes a body portion which holds the stator core 2 and is formed in a cup shape. The main body portion 33 is configured to serve as a casing of the magnet pump and a frame of the motor. 34 is the main body
It is a cover member that constitutes a casing of the pump together with 33, and is joined to the main body 33 while maintaining water tightness. 38 is a liquid inlet provided in the cover member 34, 39 is the cover member 34
It is a liquid outlet provided in the. Reference numeral 40 denotes a rotating body that is rotatably housed in the casing and includes an impeller. 43 is a driven-side magnet provided on the rotating body 40. The stator core 32 and the driven magnet 43 are opposed to each other, and when a magnetic field is generated in the stator core 32, a force is transmitted to the driven magnet 43 by the magnetic field and the rotating body 40 can be rotated. ing.

When the rotating body 40 rotates, the pressure in the central space 44 decreases due to the rotation of the impeller portion formed on the rotating body 40, and the liquid flows in from the liquid inflow port 38. Then, the liquid that has flowed in passes through the impeller portion and flows out from the liquid outlet 39.

The motor in this example is a brushless motor using a magnetic detection element. That is, 49 is a magnetic detection element, and one is arranged at each of three locations on a circle outside the casing that is centered on the axis of the rotating body 40 (only one location in the figure). Description). The three magnetic detection elements 49 detect the rotation angle of the rotating body 40 by picking up the magnetic field of the driven side magnet 43, and based on the information, apply current to the winding portion at appropriate timing to rotate the rotating body 40. It is configured to sustain the rotation of. Reference numeral 48 denotes a back cover which is attached to the back side surface of the main body 33. Reference numeral 50 is a printed wiring board to which the magnetic detection element 49 is fixed. 51
And 52 are screws for fixing the printed wiring board 50 to the stator core 32.

Problems to be Solved by the Invention In the above-mentioned configuration, the printed wiring board 50 to which the magnetic detection element 49 is fixed is fixed to the stator core 32. By the way, the basic structure is the same as that of this example, and there is a magnet pump in which the stator core is completely molded with synthetic resin. In such a case, the printed wiring board cannot be directly fixed to the stator core. Therefore, it is conceivable to provide a fixing means such as a screw hole in the synthetic resin body that wraps the stator core or in the synthetic resin body that constitutes the main body, and fix the printed circuit board to these synthetic resin bodies.

However, when fixing the substrate by providing fixing means such as screw holes in the synthetic resin body, it is necessary to increase the thickness of that portion in order to have the necessary strength for that purpose.
If you do so, the overall length will increase.

The present invention has been made in view of the above problems, and in a configuration in which the stator core is completely molded with synthetic resin,
Without increasing the thickness of the synthetic resin body that wraps the stator core,
Moreover, it is an object of the present invention to provide a magnet pump that can be easily attached to a wiring board for holding a magnetic detection element.

Means for Solving the Problems In order to solve the above problems, the present invention provides a substrate accommodating recess for accommodating a wiring substrate having a magnetic detection element fixed to a portion of a main body opposite to a recess for accommodating a rotating body. And a means for fixing the wiring board at the center of the back cover, while providing a back cover attachable to the main body so as to close the board accommodating recess.

Operation With the above configuration, the wiring board is held on the back cover side attached to the main body without the need to provide a fixing means for fixing the wiring board to the synthetic resin body such as the main body.

Embodiment Hereinafter, a magnet pump according to an embodiment of the present invention will be described. FIG. 1 shows the structure of the magnet pump in this embodiment. In FIG. 1, reference numeral 1 is a winding portion formed of a plurality of coils, and 2 is a stator core configured to stack a plurality of steel plates and holding the winding portion 1. Reference numeral 3 denotes a body portion which is wound around the winding portion 1 and the stator core 2 and is formed in a cup shape. The main body 3 is configured to serve as a casing of the magnet pump and a frame of the motor. Reference numeral 4 denotes a cover member that constitutes the casing of the pump together with the main body portion 3, and the cover member 4 is joined to the main body portion 3 by engaging the main body portion 3 at the engaging portion 5. 6 is a cover member 4 and a main body 3
It is a packing to keep the watertightness between. Reference numeral 7 denotes a casing formed by the cover member 4 and the main body 3. Reference numeral 8 is a liquid inlet provided in the cover member 4, and 9 is a liquid outlet provided in the cover member 4.

Reference numeral 10 denotes a rotating body housed in the casing 7 and provided with an impeller. 11 is a blade portion integrally formed with the rotor 10 by a synthetic resin that constitutes the rotor 10, 12 is a central space surrounded by the blade portion 13, 13 is a driven-side magnet fixed to the rotor 10, and 14 is It is a bearing member. The stator core 2 and the driven magnet 13 are opposed to each other. When a magnetic field is generated in the stator core 2, a force is transmitted to the driven magnet 13 by the magnetic field so that the rotating body 10 can be rotated. Has become.

Reference numeral 15 is a supporting shaft for supporting the rotating body 10, and its material is ceramic. One end of the supporting shaft 15 is held by a holding part 16 formed on the bottom of the main body 3, and the other end is provided in the vicinity of the liquid inlet 8 of the cover member 4, which is a shaft holder.
Held by 17.

Reference numeral 18 denotes a back cover attached to the back side surface of the main body 3.
That is, the outer edge portion 18a of the back cover 18 fits into the brazing portion 3a formed on the main body portion 3 and is fixed to each other by an adhesive or welding. 19 is a magnetic detection element,
One is provided in each of three spaces on the outside of the casing 7 on a circle centered on the axis of the rotating body 10 (only one is shown in the drawing). The three magnetic detection elements 19 can detect the rotation angle of the rotating body 10 by picking up the magnetic field of the driven magnet 13, and based on the information, the current is supplied to each coil of the winding unit 1 at an appropriate timing. A brushless motor is constructed by flowing it. Reference numeral 20 is a printed wiring board to which the magnetic detection element 19 is fixed. Reference numeral 21 denotes a screw that fixes the printed wiring board 20 to the back cover 18, and 20 is fixed only by the screw 21 on the rotation center axis of the rotating body 10. Reference numeral 22 denotes a terminal provided on the printed wiring board 20 for leading a signal from the magnetic detection element 19 to the outside. FIG. 2 is a side view of the main body 3 as seen from the direction of arrow A in FIG. 1 with the back cover 18 not attached. Reference numerals 23a, 23b and 23c respectively denote housing recesses formed in the main body 3 for housing the back cover 18, and the three magnetic detecting elements 19 are respectively housed recesses 23a, 23b and 23c.
Will be housed in.

FIG. 3 is an exploded view with the back cover 18 and the printed wiring board 20 removed. The assembly process of this part will be described below. In this step, the main body 3 is fixed with the back side opening facing upward as shown in FIG. Magnetic detection element 19
The terminals 22 are attached to the printed wiring board 20 by soldering in advance, and the printed wiring board 20 is fixed to the back cover 18 with screws 21. Then, with the surface on which the printed wiring board 20 is mounted facing downward, the back cover 18 is placed over the back side opening of the main body 3 so that the printed wiring board 20 is housed in the main body 3. At this time, the printed wiring board 20 is fixed to the back cover 18 with a single screw only at a point that coincides with the rotation center axis of the rotating body 10.
Each of the three magnetic detection elements 19 has a predetermined housing recess 23a, 23.
The printed wiring board 20 can be adjusted by slightly rotating it with respect to the back cover 18 so that the printed wiring board 20 can be accommodated in b and 23c.

Further, in the conventional example of FIG. 4, the printed wiring board is fixed to the stator core by using a plurality of screws, but in the present embodiment, the printed wiring board 20 is fixed to the back cover 18 by a screw 21 at one central position. As a result, the time and effort required to attach the board can be greatly reduced, and the assembly becomes easy.

As described above, according to the present invention, the substrate accommodating concave portion for accommodating the wiring substrate having the magnetic detection element fixed is formed in the portion of the main body opposite to the concave portion for accommodating the rotating body. By providing a back cover that can be attached to the main body so as to close the recess, and providing a means for fixing the wiring board at the center of the back cover, the wiring board is attached to the synthetic resin body such as the main body. The wiring board is held on the side of the back cover that is attached to the main body without the need to provide a fixing means for fixing the main body. Therefore, the thickness of the synthetic resin body such as the main body is increased to fix the wiring board. No need to
The overall length can be kept small. In addition, heat from the stator core is not directly transmitted to this wiring board, and problems such as warpage of the board due to heat are less likely to occur. Further, since the means for attaching the wiring board is provided in the central portion of the back cover, the wiring board can be fixed only in the central portion, and the labor required for attaching the substrate can be reduced. Is possible.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing the inside of a magnet pump according to an embodiment of the present invention, and FIG. 2 shows the main body of the magnet pump in the direction of arrow A shown in FIG. FIG. 3 is a side view when viewed, FIG. 3 is an exploded view of the same magnet pump with a back cover removed, and FIG. 4 is a sectional view showing the inside of a conventional magnet pump. 1: Winding part, 2: Stator core 3: Main body part, 4: Cover member 7: Casing, 10: Rotating body 11: Blade part, 13: Drive side magnet 15: Support shaft, 18: Back cover 19: Magnetic sensor 20: Printed wiring board, 21: Screws 23a, 23b, 23c: Recessed recess

Claims (1)

[Scope of utility model registration request] 1. A winding member including a plurality of coils, an annular stator core for holding the winding member, a rotor housing for holding the stator core and being surrounded by the stator core. A main body portion provided with a concave portion for mounting and a rotary body accommodating concave portion of the main body portion,
A cover member that constitutes a casing of the pump together with the main body portion, a rotor provided with an impeller and a driven-side magnet, and rotatably housed in the casing so that the driven-side magnet faces the stator core, A magnetic detection element for detecting the rotation angle of the rotating body by picking up the magnetic field of the driven side magnet and for supplying an electric current to each coil at an appropriate timing based on the information; A recess for accommodating the magnetic detection element is formed on the side opposite to the accommodating recess, and a back cover that can be mounted so as to close the recess is provided, and the magnetic detection element is provided at the center of the back cover. Fixing means for fixing the wiring board to be held is provided and the wiring board is fixed to the back cover by using this fixing means, and the wiring board is placed on top. Magnet pumps the rear cover as paid to the board accommodating recess, characterized in that it is attached to the body portion.