JPH11294370A - Electromagnetically driven pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the trouble that the longitudinal direction and height direction of a pump can not be miniaturized because an electromagnetically driven pump uses a radial anisotropic magnet as the permanent magnet of a rotor in a motor part, current flowing to the winding of a stator is increased, the lamination thickness of a stator part must be increased and a driving board equipped with a driving circuit element such as an FET developing heat is arranged to the outside of a main body. SOLUTION: This electromagnetically driven pump is so formed that the permanent magnet 11 of a rotor is formed of a pole anisotropic magnet, a board for sensor 5 and a driving board 37 are arranged in the inside of the outside casing 7 of a motor part 1, and the driving circuit element of the driving board 37 is tightly stuck to a cover 39 formed from the heat conductive metal of the outside casing 7, thereby magnetic force can be increased, a current value to the wiring of a stator can be reduced, the exothermic action of the driving circuit element can be reduced, and the driving circuit element is arranged in the outside casing 7 so as to realize miniaturization.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetically driven pump used for circulating hot and cold water in a hot water heater, a hot water heater and the like.

[0002]

2. Description of the Related Art Conventionally, pumps used for circulating bath water or supplying hot water in ordinary households have been required to be miniaturized, and a shaft sealing portion has been eliminated in order to prevent leakage of hot water. For this reason, a partition casing integral with the pump casing made of a synthetic resin molded product is fitted inside the stator of the motor section of the pump, and the permanent magnet section and the rotating shaft of the impeller are disposed in the partition casing. In addition, an electromagnetically driven pump having a flow path in the motor section is used.

FIG. 3 is a cross-sectional view of a conventional electromagnetically driven pump. As shown, the electromagnetically driven pump is arranged in a motor section 1, a pump casing 2 connected to the motor section 1, and a pump casing 2. It has an impeller 3, a casing cover 4 joined to the pump casing 2, a sensor board 5 arranged in the motor section 1, and a drive board 6 arranged outside the main body.

The motor unit 1 is integrally formed with an outer shell casing 7 made of aluminum, a stator 8 provided in the outer shell casing 7 and the pump casing 2, and fitted inside the stator 8. A casing 9 for partition made of PPE resin and a rotor located in the casing 9 for partition, that is, the rotating base 10 of the impeller 3 and the outer periphery of the rotating base 10 of the impeller 3 are fixed to correspond to the stator 8. A permanent magnet 11, bearings 12 fixed to both ends of a rotating base 10 of the impeller 3, and the bearing 12 fixed to the center of the casing 9 for partition are fitted to the impeller 3.
, So that the inside of the motor section 1 is formed as a flow path. The sensor substrate 5 is arranged in a space at the inner bottom of the outer casing 7 of the motor unit 1.

[0005] The main part of the pump casing 2 has an impeller accommodating portion 14 for accommodating the main portion of the impeller 3 having the blade. The impeller accommodating portion 14 has an O-ring 15 and a SUS plate 16 interposed therebetween. To the flange portion of the outer casing 7 of the motor portion 1. The casing cover 4 is joined to the opening side of the pump casing 2 via a packing 17 having a communication hole and a partition plate 18, and has a suction port 19 and a discharge port 20. A shaft support 21 is provided in the center of the partition plate 18, and the shaft support 21 supports the tip of the rotation support shaft 13.

[0006] The driving substrate 6 provided outside the main body includes:
A control circuit for supplying a current flowing through the winding of the stator 8 is provided. The control circuit is provided in an aluminum case 22 for cooling a drive circuit element such as an FET in the control circuit.

In the electromagnetic drive pump having the above structure, the sensor substrate 5 senses the N and S poles of the permanent magnet 11 on the impeller 3 side and sends a rectangular signal to the drive substrate 6. Also,
The driving substrate 6 is FE based on the signal of the sensor substrate 5.
A current is supplied to the winding of the stator 8 by a driving circuit element such as T.

The current is supplied to the windings of the stator 8 to generate a rotating magnetic field, and the impeller 3 having the rotating base 10 provided with the permanent magnet 11 facing the stator 8 via the casing 9 for partitioning. It rotates and performs the required pumping action.

[0009]

The conventional electromagnetic drive pump uses a radially anisotropic magnet as the stator 8 in the motor unit 1 and the permanent magnet 11 in the rotating base 10 of the impeller 3. The current flowing through the windings increases, and the thickness of the stator 8 must be increased. Also, when the current flowing through the winding of the stator 8 increases, the heat generated by the driving circuit elements such as the driving FETs increases. Therefore, it is necessary to perform water cooling through a heat radiating plate. Must be disposed outside the main body.

For the above reasons, it has not been possible to reduce the size of the pump in the longitudinal direction and the height direction.

It is an object of the present invention to provide a miniaturized electromagnetically driven pump, taking the above conventional problems into account.

[0012]

In order to achieve the above object, according to the present invention, a stator and a permanent magnet of a rotor arranged in an outer casing of a motor section are partitioned by a casing, and a flow path is formed in the motor section. Wherein the permanent magnet is formed of a polar anisotropic magnet, a sensor substrate for detecting rotation of the rotor and a driving substrate for receiving a signal from the sensor substrate are provided in an outer casing, and the driving is performed. An electromagnetically driven pump is configured in which the driving circuit elements of the substrate are brought into close contact with the lid made of a heat conductive metal of the outer casing.

According to the present invention, the magnetic force can be increased by using a polar anisotropic magnet as the permanent magnet of the rotor. As a result, the current value to the stator winding is reduced, and the heat generated by the stator is reduced. In addition, since the current value of the stator winding is reduced, the heat generation of the drive circuit element is reduced, and furthermore, the drive circuit element is brought into close contact with a lid made of a heat conductive metal. Since the need for water cooling is eliminated, and the drive substrate can be incorporated in the outer casing of the motor section, a small electromagnetically driven pump can be realized.

[0014]

DETAILED DESCRIPTION OF THE INVENTION According to the first aspect of the present invention, a stator is disposed in an outer casing of a motor, and a permanent magnet of a rotor, which is a rotating base of an impeller of a pump, is mounted on the stator. Positioned inside the part, the stator and the permanent magnet are partitioned by a casing to form a flow path in the motor part, using a polar anisotropic magnet as the permanent magnet, a sensor substrate and An electromagnetic drive pump in which a driving substrate is provided in the outer casing, and a driving circuit element of the driving substrate is brought into close contact with a lid made of a heat conductive metal of the outer casing. The current value to the stator winding is reduced, the current to the driving circuit element is also reduced, the heat generation of the stator section and the driving circuit element is reduced, the thickness of the stator can be reduced, and the driving substrate is An effect that can be miniaturized can be incorporated in the shell casing.

An embodiment of the present invention will be described below with reference to the drawings. (Embodiment 1) FIG. 1 is a sectional view of an electromagnetically driven pump according to Embodiment 1 of the present invention, and FIG. 2 is a configuration diagram of a circulating warm bath apparatus using the electromagnetically driven pump. In FIG. 1,
The same components as in the prior art are assigned the same reference numerals as in the prior art, and their configurations and operations are omitted.

A feature of the electromagnetically driven pump of the first embodiment is that a stator 8 is disposed in an outer casing 7 of the motor unit 1, and a permanent base of a rotor serving as a rotating base of the impeller 3 of the pump unit 1. In an electromagnetically driven pump having a configuration in which a magnet 11 is positioned inside the stator 8, the stator 8 and the permanent magnet 11 are partitioned by a casing 9 for partitioning to form a flow path in the motor unit 1, A polar anisotropic magnet is used as the magnet 11, and the sensor substrate 5 and the drive substrate 37 are connected to the inner bottom of the outer casing 7 and the stator 8.
An aluminum lid 39 which is a heat conductive metal is provided on the outer casing 7, and a drive FET 38 which is a drive circuit element of the drive substrate 6 is formed by a silicone agent 40 which is a heat conductive adhesive. The configuration is such that the aluminum cover 39 is in close contact with the aluminum cover 39.

Since a driving board 37 is provided in addition to the sensor board 5 in the space between the inner bottom of the outer casing 7 and the stator 8 in the motor section 1, there is nothing outside the main body. Not attached. Further, the configuration of the pump section is not different from that of the conventional technology.

The electromagnetic drive pump according to the first embodiment can increase the magnetic force by using a polar anisotropic magnet as the permanent magnet 11 of the rotor as described above, and as a result, flows through the winding of the stator 8. The current is reduced, the thickness of the stator 8 can be reduced, and the length of the pump in the longitudinal direction can be reduced.

Further, since the current flowing through the winding of the stator 8 is reduced, the driving FET 3
Since the heat conductive silicone agent 40 is in close contact with the aluminum lid 39, the current flowing through the driving FET 38 in the driving substrate 37 is reduced, and water cooling is not required. 7, so that the height of the main body can be reduced.

According to the above configuration, a small electromagnetically driven pump which is reduced by 21% in the height direction and reduced by 35% in the length direction can be realized as compared with the conventional electromagnetically driven pump.

The electromagnetic drive pump is used, for example, by being incorporated in a circulating warm bath apparatus shown in FIG.

That is, as shown in the figure, a circulating bath 29 is attached to a bath 28, bath water 30 in the bath 28 is taken from a hair cap 31, and heated to a predetermined temperature by a heating unit 32 in the circulating bath 29. Then, after dirt components and microorganisms contained in the bath water 30 sent to the filtration tank 35 through the circulation path 34 are adsorbed and filtered, the bath 28 is passed through the circulation path 36.
In the circulating warm bath apparatus, the electromagnetically driven pump 3
Circulate bath water with 3. And the electromagnetic drive pump 3
Numeral 3 sucks in the bath water 30, performs a discharge function and a pump function.

The circulating warm bath 29 may be installed in a bathroom as an indoor unit, or may be installed outdoors as an outdoor unit. Here, since the electromagnetic drive pump 33 can be miniaturized by the above-described configuration, the circulating warm bath 29 can also be miniaturized, and the assembling thereof can be simplified and the maintenance can be facilitated.

[0024]

As is apparent from the above description, the electromagnetically driven pump according to the present invention has a structure in which a permanent magnet of a stator and a rotor of a pump section is partitioned by a casing to form a flow path in a motor section. Since a polar anisotropic magnet was used as the sensor substrate and the driving substrate were provided in the outer casing, and the driving circuit elements of the driving substrate were brought into close contact with the heat conductive lid of the outer casing, so that the electromagnetic This has the effect that the drive pump can be downsized.

[Brief description of the drawings]

FIG. 1 is a sectional view of an electromagnetically driven pump according to a first embodiment of the present invention.

FIG. 2 is a configuration diagram of a circulating warm bath apparatus using the electromagnetically driven pump.

FIG. 3 is a sectional view of a conventional electromagnetic drive pump.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Motor part 2 Pump casing 3 Impeller 4 Casing cover 5 Sensor substrate 7 Outer casing 8 Stator 9 Partition casing 10 Rotation base 11 Permanent magnet 12 Bearing 13 Rotation support shaft 14 Impeller storage part 15 O-ring 16 SUS plate 17 Packing 18 Partition plate 19 Suction port 20 Discharge port 21 Shaft support 37 Driving board 38 Driving FET 39 Aluminum lid

Claims (1)

[Claims] A stator is disposed in an outer casing of a motor, a permanent magnet of a rotor serving as a rotation base of an impeller of a pump is positioned inside the stator, and the stator and the permanent magnet are connected to each other. A flow path formed in a motor section by partitioning the casing with a casing, wherein the permanent magnet is formed of a polar anisotropic magnet, and a sensor substrate and a drive substrate are provided in the outer casing; An electromagnetically driven pump characterized in that a driving circuit element of a substrate is closely attached to a lid made of a heat conductive metal of an outer casing.