JPH0341670Y2 - - Google Patents

Description

[Detailed explanation of the idea] (b) Industrial application fields The present invention relates to a washing machine.

(b) Conventional technology Conventionally, in order to set the water flow according to the amount of laundry, fluctuations in the water level on the wall of the washing tub in response to changes in the water flow in the washing tub are detected, and this detects the fluctuations in the water level on the wall of the washing tub. The one that controls the operation of the motor for
This is shown in Publication No. 6519.

As a means for detecting fluctuations in the water level, a magnet is attached to the float, and the magnet detects the following:
It is conceivable to open and close a plurality of reed switches corresponding to each water level, and to detect the detection based on the open/close signals of the reed switches.

However, in such a case, the greater the amount of water, the greater the fluctuation in the water level, so even for the same amount of laundry, different controls are performed depending on the amount of water.

(c) Problems that the invention aims to solve This invention uses a magnet attached to a float and multiple reed switches to detect fluctuations in the water level on the wall of the washing tub in response to changes in the water flow inside the washing tub. In a washing machine that controls the strength of the water flow, the same water flow control can be performed even if the amount of water differs.

(d) Means for solving the problem The washing machine according to the present invention includes a float that moves up and down according to fluctuations in the water level in the washing tub, a magnet attached to the float, and an opening/closing operation using the magnet. and a control device for controlling the operation of rotary blades disposed at the bottom of the washing tub according to operation signals from the reed switches arranged in the vertical direction; The intervals between the two are set to become wider as they move upward.

(E) Effect: The larger the amount of water (the higher the water level), the greater the fluctuation in the water level on the tank wall, so the interval between the upper reed switches is widened accordingly to balance the situation.

(f) Examples Embodiments of the present invention will be described based on the drawings.

In Figure 2, 1 is the machine frame of a two-tub washing machine, 2
and 3 are a washing tub and an outer dehydration tub arranged side by side in the machine frame 1; 4 is a rotary blade disposed at the center of the bottom of the washing tub 2, which is rotationally driven by a drive motor (not shown). Reference numeral 5 denotes an operation section installed above the rear part of the machine frame 1, and on the front thereof, various operation keys such as water flow intensity, process time, etc., and various operation buttons such as a drain valve are arranged.

Furthermore, 6 is a water filling box attached to the lower part of the operation unit 5, 7 is a lower water filling port, 8 is a lint filter,
9 is the upper lid of the washing tub 2; 10 is the outer dehydration tub 3;
11 is a drain hose.

As shown in FIGS. 6 and 7, the rotor blade 4 has the following structure:
Three blade bodies 4b are formed from the top of a cylindrical body 4a which doubles as a screw boss installed in the center and have a large diameter chevron shape, and extend from the top of the blade 4b to the blade periphery.
It is fitted onto a drive shaft 12 from a drive motor protruding from the bottom, and a screw 13 is inserted from above the cylindrical body 4a to secure it with the screw.

At this time, since the cylindrical body 4a has a certain height, the screw 13 inserted conventionally may tilt before reaching the drive shaft 12 and may not fit well into the screw hole, resulting in poor workability. However, in this embodiment, three guide ribs 14 are formed in the vertical direction on the inner surface of the cylinder 4a, so that the screw can be simply inserted from above the cylinder 4a.
It fits smoothly into the screw hole, making the installation work of the rotor blade 4 very easy.

Now, in the washing tub 2, as shown in FIG.
A float chamber 16 is defined through the cover 15, and a float pipe 17 is inserted into the float chamber 16.
A float 18 is arranged inside the float tube 17. The lower end of the float pipe 17 communicates with the inside of the washing tub 2 through the opening 19 of the cover 15, and the water level inside the float pipe 17 fluctuates in accordance with fluctuations in the water level on the wall surface of the washing tub 2. 1
8 moves up and down. The float 18 is connected to a magnet 20 disposed inside the operating section 5 via a connecting rod 21, and the magnet 20 moves up and down in accordance with the up and down movement of the float 18.

A switch plate 28 on which six reed switches 22 to 27 are arranged in the vertical direction is closely opposed to the magnet 20, and each of the reed switches 22 to 27 is closed when the magnet 20 approaches. The intervals T of the reed switches 22 to 27 are set to be wider as they move upward. That is, T ₁ >T ₂ >T ₃ >T ₄ >T ₅ .

FIG. 3 shows a block circuit diagram of the control section, where 29 is a microcomputer (hereinafter referred to as microcomputer) which is the center of control, and 30 is a block diagram of the various LEDs.
31 is an input circuit for the operation signals of the various operation keys and the reed switches 22 to 27; 32 is a circuit abnormality detection circuit;
33 is a clock signal and reset signal transmission circuit;
Reference numeral 34 indicates a buzzer circuit for notifying an abnormality alarm and the end of a process, 35 indicates a reference pulse generation circuit for generating a pulse that is the basis for time counting by the microcomputer 29, 36 indicates a power supply circuit, 37 indicates a drive motor, and 38 indicates a drive motor for the drive motor 37. This is a load control circuit for controlling operation.

The operation of this configuration will be explained based on FIGS. 4 and 5.

When the washing process is started and the rotary blades 4 are driven to rotate, the center of the water surface of the washing water in the tank descends as the rotary blades 4 rotate, and the peripheral part rises along the wall of the tank. change in shape. At this time, as the water level on the tank wall rises, the float 18 is pushed up, and the magnet 20 causes the reed switches 22 to
27 are closed in order from the bottom.

Generally, if the amount of water and the reversal cycle of the rotary blades 4 are the same, the greater the amount of laundry in the tub, the greater the resistance given to the rotary blades 4, and the less likely the water surface will become cone-shaped. Therefore, the degree of rise in the water level on the tank wall surface is small, and the number of reed switches closed by the magnet 20 is also small.

Also, if the amount of laundry and the reversal cycle of the rotary blade 4 are the same, the larger the amount of water (the higher the water level), the higher the water level.
Since the degree of rise in the water level on the tank wall is also large, by setting the interval T between the reed switches 22 to 27 to be wider as they move upward, if the amount of water is different but the amount of laundry is the same, approximately the same number of reeds can be used. The switch was closed.

Now, first, when the switch 39 for starting the washing process is operated, the microcomputer 29 checks whether the lowermost reed switch 22 is closed, and if it is not closed, it sounds a buzzer to indicate that there is insufficient water. and request water supply.

The explanation will be continued assuming that only the reed switch 22 is closed after water is replenished.

The microcomputer 29 first operates the rotor blade 4 with a standard water flow (reversal cycle of the rotor blade 1.6 seconds ON - 0.4 seconds OFF).
Rotate. At this time, the lower the amount of laundry in the tub, the more the upper reed switch will close.
If only the th reed switch 23 is closed, it is determined that there is a large amount of laundry, and the strength of the water flow is changed to strong (rotary blade reversal cycle: 1.8 seconds ON - 0.2 seconds OFF), and washing is performed. Hereinafter, when the third reed switch 24 from the bottom is closed, the amount of laundry is determined to be standard and the water flow is not changed, and when the fourth reed switch 25 from the bottom is closed, the amount of laundry is determined to be standard. Judging that there is little water flow, the strength of the water flow is reduced to prevent damage to the fabric (reversal cycle of rotor blades is ON for 0.4 seconds - 1.6 seconds)
OFF) and wash. In addition, if any reed switch other than the reed switch 22 does not close, it is determined that the amount of laundry is too large, and at the same time the laundry is washed with a strong stream of water, a buzzer sounds to notify the user of this fact. .

In this embodiment, after water supply, the reed switch 22
For example, if the reed switch 23 is closed, it is assumed that the reed switch 23 is closed, and the judgment criteria based on the closed state of the reed switch is shifted one step upward during washing. Just leave it there.

(G) Effects of the invention This invention uses a magnet attached to a float and multiple reed switches to detect fluctuations in the water level on the wall of the washing tub in response to changes in the water flow in the washing tub, thereby controlling the strength of the water flow in the tub. In the washing machine, the interval between the reed switches is set wider as the reed switches move upward, so that almost the same judgment can be made even if the amount of water is different, and the same water flow control can be performed.

[Brief explanation of drawings]

Fig. 1 is a perspective view of the main parts of the washing machine of the present invention, Fig. 2 is an overall perspective view of the washing machine, Fig. 3 is a block circuit diagram of the control section, and Fig. 4 is a flowchart showing the washing operation. , FIG. 5 is a specific circuit diagram, FIG. 6 is a plan view of the rotor blade, and FIG. 7 is a sectional view of the same essential part. 2...Washing tub, 18...Float, 20...Magnet, 22-27...Reed switch, 29...Microcomputer (control device).

Claims (1)

[Scope of utility model registration request] A float that moves up and down in accordance with fluctuations in the water level in the washing tub, a magnet attached to the float, a plurality of reed switches that are opened and closed by the magnet and arranged in a vertical direction, and each of the reed switches A washing machine, comprising: a control device for controlling the operation of rotary blades disposed at the bottom of the washing tub in accordance with an operation signal from the washing tub, and the interval between the reed switches is set to be wider toward the top.