JP3337946B2 - Disposer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disposer having a device for detecting an overload state of a motor of a disposer, issuing an alarm and preventing burnout of the motor.

[0002]

2. Description of the Related Art Conventionally, as a disposer provided with means for crushing garbage by rotating a motor, Japanese Unexamined Patent Publication No. 53-830 has been disclosed.
There is known a disposer having an overload alarm device described in Japanese Patent Application Publication No. 50-2005 and the like.

The overload alarm device 1 of this disposer is
As shown in FIG. 3, the power supply system L of the three-phase AC motor 2
A detecting resistor 3 provided in each phase, a rectifying circuit 4 connected to both ends of the detecting resistor 3 for converting an AC voltage to a DC voltage, a comparing circuit 5 connected to the rectifying circuit 4, and a motor 2 Buzzer 6 and lamp 7 for alarming overload of the vehicle, and alarm relay 8 for driving these buzzer 6 and lamp 7
And a protection relay that shuts off power supply to the motor 2 to prevent the motor 2 from burning.

The comparison circuit 5 compares the load voltage output from the rectifier circuit 4 with a reference voltage value and adjusts a variable resistor in the comparison circuit 5 to a preset reference voltage value. It is configured to output an alarm signal to the alarm relay 8 when the load voltage is increased.

The alarm relay 8 opens and closes a relay contact 8a in response to an alarm signal sent from the comparison circuit 5,
The buzzer 6 is sounded and the lamp 7 is turned on with the relay contact 8a closed.

[0006] In the conventional device configured as described above, the voltage across the detection resistor 3 due to the load current of the motor 2 is converted into a DC load voltage in the rectifier circuit 4, and this load voltage is compared with a reference voltage value. The comparison is made in the circuit 5.

Here, the reference voltage value is set slightly lower than a value obtained by rectifying the voltage across the detection resistor 3 when a load current equal to the current for activating the protection relay flows through the detection resistor 3. Therefore, in the process in which the overload is applied to the motor 2 and the load current increases, and the voltage across the detection resistor 3 increases accordingly, first, the alarm relay 8
Activates and issues an alarm.

Then, after the alarm, the protection relay is activated to cut off the power supply to the motor 2, thereby preventing the motor 2 from burning.

That is, when the value obtained by rectifying the voltage across the detection resistor 3 exceeds the reference voltage value, the alarm relay 8 is activated, the relay contact 8a is connected, the buzzer 6 is sounded, and the lamp 7 is turned on. Alerts the user,
At this point, if the overload state of the motor 2 is eliminated, the protection relay is activated and the power supply to the motor 2 is not interrupted.

[0010]

However, in such a device disclosed in Japanese Patent Application Laid-Open No. 53-83050, the overload state of the motor 2 cannot be eliminated and the protection relay cuts off the power supply to the motor 2. Then, the load current becomes the detection resistor 3
, The voltage between both ends becomes 0, and the comparison circuit 5 terminates the alarm operation.

For this reason, the user cannot recognize that the motor 2 is in an overload state and has stopped due to the action of the protection relay, and may erroneously recognize that the disposer has failed.

Also, an overload alarm device 1 for a disposer
Needs to have various circuits such as a rectifier circuit 4 and a comparison circuit 5, and additionally provide a power supply circuit 9 for supplying operating power to these circuits independently of a power supply circuit for driving the motor 2. Therefore, there is a problem that the number of parts increases.

As a result, the manufacturing cost increases, the possibility of failure increases, and the size of the apparatus itself increases, requiring an installation space.

Accordingly, the present invention provides a disposer capable of recognizing a user that a motor is overloaded and a protection device is working and stopped while avoiding a complicated structure. It is an issue.

[0015]

According to the first aspect of the present invention, there is provided a crushing means for crushing garbage by rotating a motor, and detecting an overload state of the motor. A disposer comprising: a detection unit; and a motor burnout prevention unit that shuts off supply of a drive current to the motor when an overload state of the motor is detected by the detection unit. An alarm means is provided which is activated only when applied to indicate that the supply of the drive current is cut off, and in a normal state, the drive current to the motor side via the motor burnout prevention means is provided. The alarm means is connected in parallel with the motor burnout preventing means so that a voltage equal to or higher than the predetermined value is applied to the alarm means in the power supply cutoff state by the motor burnout prevention means. It is characterized in disposer.

According to the first aspect of the present invention, in a normal operation state, a current flows to the motor burnout prevention means side, and the alarm means provided in parallel with the motor burnout prevention means has the predetermined value. A voltage higher than the value is not applied, and the alarm means does not perform the display operation.

On the other hand, when the motor is overloaded due to overloading of garbage or the like, the overload state is detected by the detecting means, and the supply of the drive current to the motor is cut off by the motor burnout preventing means. .

When the motor drive current is cut off by the motor burnout prevention means, the alarm means is connected in parallel with the cutoff point of the motor burnout prevention means. The above voltage is applied and an alarm is issued.

As described above, according to the present invention, the alarm means can be activated when the power supply to the motor is cut off only by connecting the alarm means in parallel with the motor burnout preventing means.

That is, with a simple circuit configuration without providing a complicated control circuit, it is possible to make the user aware that the motor is overloaded and stopped by the burnout prevention means. There is no risk of misunderstanding.

Further, since the alarm means operates by using the power supply circuit for driving the motor, it is not necessary to separately provide a power supply circuit for the alarm means, which contributes to effective use of the power supply circuit. It also contributes to avoiding complication of the configuration.

By keeping the configuration simple in this way, an increase in manufacturing cost and an increase in failure factors can be suppressed, and the disposer can be accommodated in a limited space under the sink.

[0023]

Embodiment 1 Hereinafter, a specific embodiment 1 of the present invention will be described with reference to the drawings. 1 and 2 show a first embodiment of the present invention.

First, the mechanical structure of the disposer 10 will be described. As shown in FIG. 1, the disposer 10 of the first embodiment includes a kitchen refuse input port 11a provided in a sink bottom 11, a kitchen crushing chamber 12, , A rotating plate 13 and a discharge port 14.

On the upper surface 13a of the rotary plate 13, a hammer 15 is rotatably supported by bolts 16a and nuts 16b. On the side wall 12a at a position facing the hammer 15, a cutting blade 17 having an annular shape and having teeth toward the inside is provided.

Below the disposer 10, a motor case 19a of the motor 19 is provided.
Are fixed so that the direction of the rotating shaft 18 provided therethrough extends substantially vertically.

The rotary plate 13 is integrally connected to a rotary shaft 18 of the motor 19 which is driven to rotate by application of an alternating current, and rotates together with the rotary shaft 18 so that the hammer 15 and the cutting blade 17 are connected to each other. It is configured to shred garbage in between.

The motor 19 is of a phase-separated type and has a main winding 19a and an auxiliary winding 19b as shown in FIG.
9a and the auxiliary winding 19b are branched at branch points 20 and 21.

Next, the driving circuit 2 of the disposer 10
4 and the configuration of the alarm circuit 29 as the alarm means will be described.

The drive circuit 24 includes a power supply 22 which is an AC power supply for driving, a manual switch 27 provided in an operation switch box for starting and stopping the disposer 10, a centrifugal relay 28, a motor 19, and a thermal protector 23.
And is configured.

The centrifugal relay 28 is connected to the branch point 20.
Between the motor 19 and the auxiliary winding 19b. When the motor 19 is rotating at a predetermined rotation speed or more, the motor 19 is cut off by the centrifugal force. And the auxiliary winding 19b.

A thermal protector 23 is connected to the other end of the auxiliary winding 19b. The thermal protector 23 includes a heater 23a as the detection means connected to the auxiliary winding 19b, and the heater 23a,
And a bimetal 23b as the burnout prevention means connected across the branch point 21.

The heater 23a and the bimetal 23b are provided close to each other. When a current of a predetermined value or more flows through the heater 23a to generate heat, the bimetal 23b
Are open to shut off the supply of the driving current to the motor 19, and when the current flowing through the heater 23a is less than a predetermined value and the amount of heat generation is small, the contact of the bimetal 23b is closed to conduct the driving current. I have.

On the other hand, the alarm circuit 29 includes a neon lamp 25 and a resistor 26 connected in series, and is provided near the manual switch 27 in the switch box.
The alarm circuit 29 is configured to turn on the neon lamp 25 when a voltage equal to or higher than a predetermined value is applied to both ends thereof, and to keep the neon lamp 25 off when the voltage between both ends is less than the predetermined value. Have been.

The alarm circuit 29 is connected to the drive circuit 2
4, a driving current is supplied to the motor 19 through the bimetal 23b in a normal operation state, and a voltage exceeding the predetermined value is applied to both ends of the alarm circuit 29. In addition, when the drive current is interrupted by the bimetal 23b, a voltage equal to or higher than the predetermined value is applied to both ends of the alarm circuit 29.

The disposer 10 according to the first embodiment
Has a reset switch (not shown) that can close the contact of the bimetal 23b in the open state again.

Next, the operation of the first embodiment will be described.

When the disposer 10 is started by turning on the switch 27, the current mainly flows through the auxiliary winding 19b first because the inductance of the main winding 19a is large. When a current flows through the auxiliary winding 19b, the motor 19 obtains a starting torque and starts rotating.

When the number of revolutions rises above a predetermined value, the centrifugal relay 28 is turned off by the centrifugal force of the motor 19, so that current does not flow through the auxiliary winding 19b and the main winding 1
It flows only to 9a.

When the rotating plate 13 rotates with the rotation of the motor 19, the kitchen refuse input port 11a
Is thrown against the side wall 12 a by the centrifugal force of the rotating plate 13 and the rotating hammer 15, and crushed by the hammer 15 and the cutting blade 17. The crushed garbage is discharged together with water from the discharge port 14.

In such a normal operation state, the current flows to the side of the bimetal 23b having a small impedance, and both ends of the alarm circuit 29 provided in parallel with the bimetal 23b.
A voltage higher than the predetermined value is not applied.

Therefore, the neon lamp 25 does not light up.

At this time, since the centrifugal relay 28 is turned off, no current flows through the heater 23a, and the bimetal 23
The contact b is kept connected.

On the other hand, if a foreign substance such as a spoon or a fork enters the kitchen crushing chamber 12 and the motor 19 is locked, or if the number of rotations of the motor 19 is significantly reduced due to too much garbage, the centrifugal force decreases. Centrifugal relay 2
8, the current flows through the auxiliary winding 19b and the heater 23a.

At this time, since the motor 19 is overloaded, the load current flowing through the motor 19 becomes larger than the predetermined value, and the heat generated by the heater 23a causes the bimetal 23b
Are opened, and the supply of the driving current to the motor 19 is cut off.

When the contact of the bimetal 23b is opened, a voltage exceeding the predetermined value is applied to both ends of the alarm circuit 29 connected in parallel with the bimetal 23b by the power supply 22, and the neon lamp 25 is turned on. At this time, the neon lamp 25
The current flowing between the two electrodes 25a and 25b is very small, so the current flowing through the motor 19 is also very small.
Does not burn out.

As described above, when the neon lamp 25 is turned on in the operation switch box, the user can recognize at a glance that the motor is in an overload state and has stopped, and the manual switch 27 can be recognized. If the motor 19 is stopped while the neon lamp 25 is turned off even though is in the ON state, the user can recognize the possibility of failure of the disposer 10,
The return method can be specified immediately, and the usability is good.

When the motor 19 is in an overload state and stopped, the contact of the bimetal 23b is closed by pressing the reset switch after removing the garbage and eliminating the overload state. Is the drive circuit 2
Flows to the 4 side. Then, no voltage higher than the predetermined value is applied to both ends of the alarm circuit 29, so that the neon lamp 25 is turned off. Here, since the centrifugal relay 28 is closed before the neon lamp 25 is turned on and remains as it is, a current also flows through the auxiliary winding 19b, so that the motor 19 starts rotating again and returns to the normal operation state. can do.

In addition, since the neon lamp 25 is turned on by using the power supply 22 which is a drive power supply for the motor 19, it is not necessary to separately provide a power supply circuit. Also contributes to avoiding

As described above, according to the present invention, the neon lamp 25 can be turned on when the power supply to the motor 19 is cut off only by connecting the alarm circuit 29 in parallel with the bimetal 23b.

That is, with a simple circuit configuration without providing a complicated control circuit, it is possible to make the user recognize that the motor 19 is overloaded and stopped by the thermal protector 23. There is no risk of misunderstanding.

By keeping the configuration simple in this way, an increase in manufacturing cost and an increase in failure factors can be suppressed, and the disposer can be accommodated in a limited space under the sink.

Further, in the first embodiment, since the neon lamp 25 for alarm is provided near the manual switch 27 of the operation switch box, the visibility is good.

Although the first embodiment of the present invention has been described in detail with reference to the drawings, the specific configuration is not limited to the first embodiment, and there are design changes and the like within a range not departing from the gist of the invention. Is also included in the present invention.

For this reason, for example, even if an LED, a buzzer, or the like is used instead of a neon lamp, as long as it is connected in parallel with the motor burnout prevention means, it is included in the present invention.

[0056]

As described above, according to the first aspect of the present invention, in a normal operation state, a current flows to the motor burnout prevention means side and is provided in parallel with the motor burnout prevention means. Further, a voltage higher than the predetermined value is not applied to the alarm means, and the alarm means does not perform a display operation.

On the other hand, when the motor is overloaded due to excessive garbage or the like, the overload state is detected by the detecting means, and the supply of the drive current to the motor is cut off by the motor burnout preventing means. .

When the motor drive current is cut off by the motor burnout prevention means, the alarm means is connected in parallel with the cutoff point by the motor burnout prevention means. The above voltage is applied and an alarm is issued.

As described above, according to the present invention, it is possible to operate the alarm means in accordance with the interruption of the power supply to the motor only by connecting the alarm means in parallel with the motor burnout prevention means.

That is, with a simple circuit configuration without providing a complicated control circuit, it is possible to make the user aware that the motor is overloaded and stopped by the burnout prevention means. There is no risk of misunderstanding.

Further, since the alarm means operates using the power supply circuit for driving the motor, it is not necessary to provide a separate power supply circuit for the alarm means, which contributes to effective use of the power supply circuit. It also contributes to avoiding complication of the configuration.

By keeping the configuration simple in this way, it is practically useful that the increase in manufacturing cost and the increase in the number of failure factors are suppressed, and the disposer can be placed in a limited space under the sink. Effect.

[Brief description of the drawings]

FIG. 1 is a partial sectional view showing a disposer according to a first embodiment of the present invention.

FIG. 2 is a circuit diagram of a drive circuit and an alarm circuit of the disposer according to the first embodiment.

FIG. 3 is a circuit diagram of an alarm device of a conventional disposer.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Disposer crushing means 12 Garbage crushing room 12a Side wall 13 Rotating plate 15 Hammer 16a Bolt 16b Nut 17 Cutting blade 18 Rotating shaft 19 Motor 23a Heater (detection means) 23b Bimetal (motor burnout prevention means) Alarm means 25 Neon lamp 26 Resistance

Claims (1)

(57) [Claims] A crushing means for crushing the garbage by rotating the motor; a detecting means for detecting an overload state of the motor; and a detecting means for detecting an overload state of the motor when the detecting means detects an overload state of the motor. A motor burnout prevention means for interrupting the supply of the drive current, wherein the disposer operates only when a voltage equal to or higher than a predetermined value is applied, and is in a state where the supply of the drive current is interrupted. Is provided, and in a normal state, a drive current is supplied to the motor side through the motor burnout prevention means.In a power supply cutoff state by the motor burnout prevention means, a voltage equal to or higher than the predetermined value is supplied. A disposer, wherein the alarm means is connected in parallel with the motor burnout preventing means so as to be applied to the alarm means.