JPH0362918B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Industrial Application Field The present invention relates to a pump driving electric motor, and particularly to an electric motor used in a pump mechanism of a pump-equipped washing machine.

(b) Prior Art An electric motor in which a rotor is movable in the thrust direction is known, for example, from Japanese Patent Publication No. 37-18655.
On the other hand, Japanese Utility Model Application Publication No. 57-169284 (see Figure 5) describes a liquid transfer channel (d) between the outer tank (b) and the water tank (c) of a fully automatic washing machine (a). The communication and movement of liquid is carried out by a pump (E), and at the time of execution, a transfer channel (D) is used.
A washing machine with a pump is shown in which the circuit is opened by an electromagnetic connecting valve (f);
(F) is expensive, and the solenoid's suction noise is loud, so a soundproof structure is required. Therefore, the applicant has already proposed, in Japanese Patent Application No. 59-52707, a washing machine with a pump that does not use a solenoid valve by simultaneously operating the pump and the connecting valve using an electric motor with a rotor that is movable in the thrust direction. However,
Even in this structure, when the electric motor is driven, there is a risk that abnormal noise may be generated due to rattling during rotation.

(C) Purpose of the Invention The object of the present invention is to provide a pump drive electric motor that does not generate abnormal noise during operation even when used in a pump-equipped washing machine equipped with a pump mechanism consisting of a pump and its valve. shall be.

(d) Structure of the Invention The pump driving electric motor of the present invention is for driving a pump mechanism consisting of a pump and its connecting valve, and includes a motor case, a stator housed in the motor case, and a motor for driving a pump in a thrust direction with respect to the stator. a movable rotor, the rotor is arranged so that it falls under its own weight when the energization is cut off, and is dropped by a predetermined amount from the stator position in order to obtain a biasing force in the direction of opening the valve when the energization is applied. The pump is characterized in that it is driven to rotate, and when energized, a pulling force is always applied to the rotor in the direction that the rotor is juxtaposed with the stator, so the rotor always rotates while being pressed upward, and therefore the rotor and the stator are rotated. There is no rotational drive with the rotating shaft rattling.

(e) Embodiment 1 is a washing machine with a pump, which includes a main body part 2 and a water tank part 3.
It is made up of. An outer tub 4 is suspended inside the main body 2 in a vibration-proof manner, and a washing machine 6 with a dehydration hole 5 that also serves as a dehydration tank is provided in the outer tub 4. A rotary blade 7 is installed at the bottom of the washing tub 6. is installed. The back surface of the outer tub 4 is equipped with a rotary blade 7 and a washing machine electric motor 8 for rotating the washing tub 6, and a drain port 9 for the washing tub 6 is provided, and this drain port 9 is driven by a drain solenoid 10. It is connected to a drain hose 12 via a drain valve 11. The bottom of the water tank 3 and the drain port 9 are connected by a connecting waterway 13, and the connecting waterway 13 has a pump mechanism 16 consisting of a connecting valve 14 and a reversible pump 15 for opening and closing the waterway 13. This connecting waterway 13 also communicates with the drain hose 12 via the drain valve 11.

The reversible pump 15 is an inflator 1 housed in a pump chamber 17 provided at the bottom of the water tank 3.
8, and the inflator 18 is attached to the upper end, and the lower end is connected to the pump chamber 1 in a watertight manner via a water-sealing bearing 19.
7 consists of a drive shaft 21 that protrudes downward and has its lower end serrated to form a male rotation transmission section 20.
The connecting valve 14 includes a valve body 23 having a bellows diameter in a valve chamber 22 that is integrally molded downward from the bottom wall of the pump chamber 17, and the valve body 23 is urged upward to open the valve. It houses a biasing spring 25 that always closes the port 24 and a valve rod 26 that pulls the valve body 23 downward against the biasing force of the spring 25. By pulling downward, the valve port 24 and the connection port 27 connected to the connection waterway 13 are communicated with each other.

28 is a pump electric motor that drives the pump mechanism 16, and this pump electric motor 28 is connected to the stator 2.
9, the rotor 30 is configured to be movable in the thrust direction, and the rotation shaft 31 of the rotor 30 is disposed in the vertical direction.
2 is suspended and fixed below the water tank 3, and as a result, when the power is cut off, the rotor 3
0 falls under its own weight and is held in a state moved downward by 15 mm (X) with respect to the stator 29. On the other hand, when electricity is applied, the rotor 30 is pulled up by electromagnetic force and moved from the stator 29 position to a predetermined value. ＜5mm
It rotates while falling by > (Y),
At this time, the rotor 30 further includes the stator 29.
An upward pressing force is generated that tries to rise until it is juxtaposed with . 33 and 34 are upper and lower bearings,
Reference numeral 35 designates a stopper for regulating the lower limit of fall of the rotor 30, which is formed at the upper end of the oil cap of the lower bearing 34.

36 is a cooling fan in which the lower recess 38 of the central shaft 37 is fitted into the upper end of the rotating shaft 31 and fixed with a pin 39; By inserting the male rotation transmission section 20 into the female rotation transmission section 40, the rotational driving force of the rotor 30 is transmitted to the impeller 18.

Reference numeral 41 denotes a bearing provided at a position below the cooling fan 36 on the upwardly protruding portion of the motor case 32 of the rotary shaft 31; 42 is a bearing fitting into which this bearing bearing 41 is inserted; A pair of protruding collars 43, 43 are provided axially symmetrically. 44 is a hanging piece attached to the bottom wall of the pump chamber 17, 45 is a transmission arm having a central shaft portion 45a rotatably supported on the lower end of the hanging piece 44, and this arm 45 has a bifurcated base end 45b.
is hooked onto the protruding collar 43 of the bearing holder 42 from above, and the valve rod 26 is attached to the working end 45c.
is installed.

Therefore, when the electric motor 26 is energized, the rotor 30 is pulled up and rotated to a state where it has fallen by a predetermined value <5 mm> (Y) from the stator 29 position, and the cooling fan 36 and impeller 18 rotate, and the base end 45b of the arm 45 is rotated. As it rises, the working end 45c
is lowered to pull the valve rod 26 downward.
is separated from the valve port 24 to open the connecting valve 14. At this time, since an upward biasing force is acting on the rotor 30, the base end 45b of the arm 45 is constantly pressed upward, so that the rotor 30 and the rotating shaft 31 do not rotate with any wobbling, and therefore the electric motor No abnormal noise is generated from the contact portion 28 or the contact portion between the bearing holder 42 and the arm 45.

In addition, in FIG. 4A, the diameter of the rotor 30 is 64.4 mm, the stacked thickness is 22 mm, and the stacked thickness of the stator 29 is 22 mm.
9 is a diagram showing the relationship between the displacement between the rotor 30 and the stator 29 and the push-up force of the rotor 30, and FIG. As you can see, the positional deviation between rotor 30 and stator 29 is 5 mm.
In this case, a pushing force of approximately 2 kg is applied to the rotor 30, and the motor efficiency is approximately 48% under normal conditions (60
%), but the pump motor 28 operates at approximately 1 min.
Since the current is only turned on (seconds), the increase in power consumption and heat generation is slight, and therefore these points can be ignored.

Then, by operating the operation switch 46, the washing machine electric motor 8, drain solenoid 10, clutch mechanism (not shown), and water supply valve (not shown) are combined and driven to perform washing and dewatering operations, and also to perform washing and dewatering operations. The connection waterway 13 is opened only during the period when the electric motor 28 is driven to drive the reversible pump 15, and the washing water or rinsing water is moved from the outer tank 4 to the water tank 3 or from the water tank 3 to the outer tank 4. It's getting old.

(F) Effects of the Invention According to the present invention, since the rotor is constructed so as to constantly apply a biasing force in one direction when energized, there is no wobbling of the rotor or rotating shaft, and the connection between the pump and its parts is improved. Even when used as a drive source for a pump mechanism consisting of a valve, it does not generate any abnormal noise, and since the pump and valve operate at the same time, the number of parts used is reduced, thus contributing to a reduction in manufacturing costs. It is possible to obtain an electric motor for driving a pump.

[Brief explanation of drawings]

Figures 1 to 4 relate to an embodiment of a washing machine using the pump driving electric motor of the present invention, in which Figure 1 is a cross-sectional view of the main part, Figure 2 is a side view of the entire cross-section, and Figure 3 is a cross-sectional view of the motor. Figure 4 (a) shows the diagram when the current is turned off, Figure 4 (b) shows the diagram when the current is on, Figure 4 (a) shows the relationship between the positional deviation between the rotor and the stator and the force pushing up the rotor, and Figure 4 (b) shows the positional deviation between the rotor and the stator. FIG. 5 is an explanatory diagram of the mechanism of a conventional example. 15... Reversible pump, 14... Connection valve, 16...
...Pump mechanism, 32...Motor case, 30...
Rotor, 29...stator.

Claims (1)

[Claims] 1 A communication pipe that communicates one tank with the other tank,
A rotor of a motor that drives the pump includes a valve body that opens and closes this communication pipe and is normally biased in the closing direction by a spring, and a pump that transfers liquid from the one tank to the other tank. is arranged so as to be movable in the thrust direction relative to the stator,
An opening/closing operation means is provided for converting movement of the rotor in the thrust direction into movement of the valve body in the opening/closing direction, and is arranged so that the rotor moves downward under the bias of the spring when power is cut off to the stator,
An electric motor for driving a pump, characterized in that, when the stator is energized, the rotor is rotated while being moved upward to a position below the stator position by a predetermined value.