JPH04105697A - Washing machine - Google Patents

Abstract

PURPOSE:To prevent noise from giving an adverse influence to external equipment through an AC power cable by providing a noise preventing circuit close to a leading part of the AC power cable in a main body of a washing machine. CONSTITUTION:An end part of an AC power cable 17 is connected to a circuit part 24 of a noise preventing circuit 21 from a lower side of a case 22. A control circuit part 24 is connected to a control circuit 16 by a cord cable 32. The control circuit 16 is connected to a motor 7 by a cord cable 33. The control circuit 16 is connected to an operating circuit 14 by a cord cable 34. When the motor 7 is inversely driven by the control circuit 16, noise of high frequency is generated and enter the cord cables 33 and 32. Since the noise entering the cord cable 32 is removed in the noise preventing circuit 21, the noise is prevented from leaving outside through an AC power cable 17. Thus, evil influence on external equipment is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a washing machine in which a noise prevention circuit is provided between a control circuit for controlling a motor and an AC power line.

(Prior Art) For example, a washing machine with a dehydrating function is equipped with an operation circuit consisting of a microcomputer and electronic components mainly for operation control, and the operation circuit is generally located on the upper part of the washing machine main body. It is located inside the operation panel at the front or rear of the machine.

By the way, recently, in this type of washing machine, agitator and
It has been considered to provide a control circuit equipped with an inverter to control the speed of a motor for selectively driving the rotary tank for both washing and dewatering. When such an inverter control circuit is provided, it is preferable to provide a noise prevention circuit in order to prevent high frequency noise generated from the inverter control circuit from having an adverse effect on external equipment through the AC power line. It is conceivable that the circuit and, for example, the inverter control circuit be combined into one unit and provided on the upper part of the washing machine main body.

(Problem to be Solved by the Invention) However, the AC power line is generally led out from the lower part of the washing machine body, and in this case, there is a gap between the lead-out part of the AC power line in the washing machine body and the unit. The distance is long;
The AC power line is connected to the noise prevention circuit in a long way inside the washing machine main body. For this reason, the AC power line is in close proximity to other electric wires inside the washing machine, and there is a risk that induced noise may enter the AC power line and adversely affect external equipment. There may be a problem that the effect of the noise prevention circuit cannot be fully exhibited.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a washing machine in which the effects of a noise prevention circuit can be sufficiently exhibited, and in addition, the noise prevention circuit can be easily attached to the main body of the washing machine.

[Structure of the Invention (Means for Solving the Problems) The present invention is characterized in that the main body of the washing machine is provided with a control circuit for controlling the motor, and a noise prevention circuit is provided between the control circuit and the AC power line. There is a noise prevention circuit in the washing machine,
The feature is that it is placed near the lead-out part of the AC power line in the main body of the washing machine.

The case of the noise prevention circuit is provided with an engaged part that engages from the inside of the outer box with the engaging part formed on the back of the outer box of the washing machine main body, and an engaged part that engages with the edge of the back of the outer box. It is preferable to provide a pinched portion that fits together and is sandwiched between the outer case and a back cover attached to the back surface of the outer case.

(Function) According to the above-described means, the AC power line is connected to the noise prevention circuit near the lead-out part of the washing machine body, so the AC power line is not wired long inside the washing machine body. , noise from other wires is reliably removed in the noise prevention circuit.

When the case of the noise prevention circuit has the above configuration, the case engages the engaged part with the engaging part of the outer box, and the clamped part engages with the edge of the back of the outer box. rear,
By attaching the back cover to the back surface of the outer box and sandwiching the clamped portion between the outer box and the back cover, it can be attached and fixed to the main body of the washing machine.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

First, in FIG. 1 showing the overall structure, 1 is the washing machine main body of the dehydrating/washing machine, 2 is its outer box, and a back cover 3 is attached to the back of the outer box 2 with screws. A water receiving tank 4 is provided inside the outer box 2, a rotating tank 5 is provided within the water receiving tank 4, and a stirring body 6 is further provided within the rotating WjS. A motor 7 made of a DCC brushless morph and a mechanism section 8 equipped with a brake mechanism, a clutch mechanism, etc. are disposed at the outer bottom of the water tank 4, and between the motor 7 and the mechanism section 8, A belt transmission mechanism 9 is provided, and based on the rotation of the motor 7, the mechanism part 8 rotates the stirring body 6 in forward and reverse directions during washing, and rotates the rotating tank 5 during dehydration.
And the stirring body 6 is rotated in one direction at high speed.

A top cover 10 attached to the top of the outer box 2 has a lid 11 in the center thereof for opening and closing a laundry entrance/exit (not shown).
is pivotally mounted, an operation panel 12 is attached to the front part, and a rear cover 13 is further attached to the rear part. Among these, an operation circuit 14 mainly provided with a microcomputer for operation control, electronic components, etc. is arranged in the operation panel 12. Further, a unit case 15 is attached to the upper rear surface of the outer box 2, and a control circuit 16 mainly provided with an inverter for controlling the speed of the motor 7 is disposed within the unit case 15.

On the other hand, on one side of the lower part of the back surface of the outer box 2, as shown in FIG.
A first engaging portion 19 consisting of an oval-shaped hole and a second engaging portion 20 consisting of a circular hole are formed below. A noise prevention circuit 21 is disposed below the lead-out portion 18, and this noise prevention circuit 21 includes a board 23 disposed within a case 22 as shown in FIG.
As shown in FIG. 2, a circuit section 24 consisting of coils 24a, 24b and a capacitor 24C is provided.

As shown in FIG. 5, the case 22 of the noise prevention circuit 21 has a bottomed cylindrical shape with a closed top surface and an open bottom surface, and the open bottom surface is closed by M2S. In the case 22, grooves 26 are formed facing each other in the lower part of the inner surface, and two pairs of ribs 27 are provided at a predetermined interval in the upper part of the inner surface. It is disposed within the case 22 in a state where it is inserted between the ribs 27 . Further, the case 22 has first and second engaged parts 28 and 29 formed in an arc shape at the upper part of the negative side, and a pin-shaped third engaged part 3 below these.
0, and furthermore, a sandwiched portion 31 that protrudes laterally is formed at the lower part of the other side surface. Therefore, this case 22
Before attaching the back cover 3 to the outer case 2, the clamped part 31 is engaged with the edge 2a on the back surface of the outer case 2 from inside the outer case 2 (see FIG. 7), and the first and second 2 engaged part 28゜2
one to engage the first engaging part 19 of the outer box 2, and then the third
By engaging the engaged part 30 with the second engaging part 20 (see Fig. 6), it is attached to the inside of the outer box 2 in a temporarily held state, and then the back M3 is attached to the back of the outer box 2. By attaching this, the clamped part 31 is clamped between the outer box 2 and its back cover 3, thereby being fixedly attached to the washing machine main body 1.

One end of the AC power line 17 is connected to a noise prevention circuit 21.
The circuit section 24 is connected from the bottom side of the case 22, and the circuit section 24 and the control circuit 16 are connected by a cord wire 32, and the control circuit 16 and the motor 7 and the control circuit 16 and the operating circuit are connected. 14 is the code line 33.34
are connected to each other by

In the above configuration, when the motor 7 is driven by an inverter by the control circuit 16, high frequency noise is generated due to chopping of the control circuit 16, and the noise is transmitted to the cord line 33 to the motor 7 and the cord line 3 to the noise prevention circuit 21.
Go into 2. Among these, the noise that has entered the cord line 32 is removed by the noise prevention circuit 21, so that noise is prevented from going out via the AC power line 17, and is prevented from having an adverse effect on external equipment. can. Furthermore, in this case, even if the cord wire 32 or the cord wire 33 is in close proximity and inductive noise enters the cord wire 32, the noise will still be transmitted to the noise prevention circuit 2.
1, the induced noise is removed from the AC power line 1.
It can also be prevented from going outside via 7.

On the other hand, the case 22 of the noise prevention circuit 21 is connected to the first case 22 as described above. The second and third engaged portions 28°29.30 are engaged with the first and second engaging portions 19°20 of the outer box 2, and the engaged portion 31 is attached to the edge of the back surface of the outer box 2. After that, the back cover 3 is attached to the back surface of the outer case 2, and the clamped part 31 is fixed to the washing machine main body 1 by being held between the outer case 2 and the back cover 3. Therefore, case 22
It can be easily installed without using screws or special parts. Further, since the case 22 is installed with the opening facing downward, there is no possibility that water from the water receiving tank 4 side will enter the inside, and the case 22 is excellent in waterproofness.

[Effects of the Invention] As is clear from the above description, the present invention provides the following effects.

In the washing machine according to claim 1, the noise prevention circuit comprises:
By arranging it near the lead-out part of the AC power line in the main body of the washing machine, the effect of the noise prevention circuit can be fully exhibited, and it is possible to reliably prevent noise from having an adverse effect on external equipment via the AC power line.

In the washing machine according to claim 2, the case of the noise prevention circuit is attached to the outer box by engagement, and is fixed using the back cover attached to the back of the outer case, so that the case can be secured with screws, etc. It can be easily installed without using.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, in which Fig. 1 is an overall cutaway side view, Fig. 2 is a block diagram of the main parts, Fig. 3 is a perspective view of the main parts from the back side, and Fig. 4 is a noise reduction diagram. A perspective view of the prevention circuit, FIG. 5 is a vertical sectional view taken along line v-v in FIG. 4, and FIG.
A vertical cross-sectional view along the line ■-■ in the figure, Figure 7 is a vertical cross-sectional view along the line ■-■ in Figure 3.
■It is a cross-sectional view along the line. In the drawing, 1 is the main body of the washing machine, 2 is the outer box, 2a is the edge, 3 is the back cover, 7 is the motor, 14 is the operation circuit, 16 is the control circuit,
17 is an AC power line, 18 is a lead-out section, and 19.20 is a first.
A second engaging portion (engaging portion), 21 is a noise prevention circuit, 22
is the case, 24 is the circuit section, 28, 29.30 is the first. Second. 3rd engaged part (engaged part), 31 is a clamped part, 3
2, 33° and 34 indicate code lines, respectively. Agent Patent Attorney Tsuyoshi Sato

Claims (1)

[Scope of Claims] 1. A washing machine comprising a control circuit for controlling a motor in the main body of the washing machine, and a noise prevention circuit provided between the control circuit and an AC power line, wherein the noise prevention circuit is arranged near a lead-out portion of the AC power line in the washing machine main body. 2. The case of the noise prevention circuit has an engaged part that engages from the inside of the outer box with an engaging part formed on the back surface of the outer box of the washing machine main body, and a case that engages with the edge of the back surface of the outer box. Claim 1 characterized in that it has a pinched part that is fitted together and sandwiched between the outer case and a back cover attached to the back surface of the outer case.
Washing machine as described.