JPH067274A - Safety device for suction port body of electric cleaner - Google Patents

Abstract

PURPOSE:To prevent malfunctioning of a safety device by a method wherein a current value is stored based on a load of surfaces to be cleaned, the type of the surfaces to be cleaned is judged from a mean thereof and a load preset and a motor is stopped when the mean exceeds a specified value. CONSTITUTION:A data memory 72 in a controller 74 stores a judgment data when a CPU71 works (for example, a current value to operate a protection circuit and continuous time of the current value) and a program memory 73 stores a program for operating the CPU71. On the other hand, a load current detection circuit 69 detects a load current of a motor 51 and the results are sent to the CPU71 through an A/D converter 70 to judge whether the protection circuit is operated or not. In this case, an operation current of a surface to be cleaned is learned for a specified time (e.g. mean value) to be stored into a data memory 72 of the controller 74. Thus, the value is defined as operation current value of a safety device and, when the current flows longer than a specified time with the value exceeding a specified value during the operation, the motor is stopped.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a suction port body of an electric vacuum cleaner having a rotating brush driven by an electric motor, and more particularly to a safety device in an overloaded state.

[0002]

2. Description of the Related Art Conventionally, this type has been disclosed in Japanese Utility Model Sho 62-1
It is known from Japanese Patent No. 39451. This is because when rotating the rotating brush and cleaning it, if carpet hair or large dust gets entangled in the rotating brush and the rotating brush slows down or stops, the load current of the electric motor increases. The resistance value of the posistor provided in series with the electric motor rapidly increases, the load current flowing through the electric motor is reduced, and the electric motor is stopped.

[0003]

As described above, the posistor method as the overcurrent protection means utilizes the increase in resistance value due to the heat generation due to the overcurrent, so that the operation is very unstable and the influence of the ambient temperature is exerted. Easy to receive.

Further, in the condition of the cleaning surface, for example, in the case of a carpet with long hair, since the normal operating current is relatively large,
In normal use, the posistor may operate and the electric motor may stop.

Even if a foreign substance is sucked in and suddenly stopped, it takes a certain amount of time for the posistor to operate, and it may not be possible to immediately stop the energization of the electric motor.

[0006]

In order to solve the above problems, the present invention relates to a suction port body having a suction port, and a rotary brush rotatably provided in the suction port body facing the suction port. And a safety device for a vacuum cleaner suction port body that includes an electric motor that rotates the rotating brush provided in the suction port body, and that stops the electric motor when the electric motor is in an overloaded state. The electric current value of the electric motor that changes depending on the load on the cleaning surface is stored, the average value of the stored values for a predetermined time is obtained, the type of cleaning surface is determined from the preset load and average value from the average value, and the average value is calculated. When the value exceeds a predetermined value, the electric motor is stopped.

Further, if the current exceeding the predetermined value continues for a certain time or more within the predetermined time, the electric motor is stopped at that time.

[0008]

The type of cleaning surface is determined from the current flowing through the electric motor, and the operating current of the safety device suitable for the cleaning surface is determined.
When a predetermined current flows for a predetermined time or longer, the safety device is activated. When the current equal to or higher than the predetermined current flows for a certain time or longer, the safety device is operated regardless of the predetermined time.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The construction of an embodiment of the suction port body of the vacuum cleaner of the present invention will be described with reference to FIGS. Reference numeral 1 denotes a suction port body, which includes a lower case 2 having an open upper surface and an upper case 3 having an open lower surface and attached to the rear side of the upper surface of the lower case 2. A bumper 4 is provided on the upper peripheral portion of the lower case 2. Further, the opening 5 on the front side of the upper surface of the lower case 2 is adapted to be opened and closed by a detachable lid body 6.

Inside the suction port body 1, front and rear rotary brush chambers 8 are formed by front and rear partition walls 7a and 7b integrally formed with the cases 2 and 3 and joined to each other and extending in the left-right direction. Are sectioned. A communication port 9 is formed at the center of the front and rear partition wall 7a. The communication port 9 extends rearward from both side edges of the communication port 9 and is formed integrally with the cases 2 and 3 and is joined to each other. By the left and right partition walls 10a, 10b, the suction port body 1
On the inner rear side, an electrical component storage chamber 11, a ventilation chamber 12 facing the communication port 9, and an electric motor storage chamber 13 are sequentially formed in the lateral direction.

A suction port 14 extending in the lateral direction is formed on the lower surface of the rotary brush chamber 8. An insertion opening 15 is formed on the rear surface of the ventilation chamber 12. Further, the upper surface and the lower surface of the ventilation chamber 12 are formed in an arc shape which is located on substantially the same circumference when viewed from the side. In addition, laterally extending restricting ridges 16 and 17 are formed to project inwardly at the rear edge portion of the upper surface and the central portion of the lower surface of the ventilation chamber 12, and the rear edge portion of the lower surface of the ventilation chamber 12 is further formed. A regulation step portion 18 extending in the lateral direction is formed on the. Further, on the lower surface of the ventilation chamber 12, there is formed a groove portion 19 which is located rearward of the regulation step portion 18 and which extends laterally and opens upward. Further, the ventilation chamber 12
Cut grooves 20 are formed in the rear edge portions of the partition walls 10a on both sides of.

A pair of front wheels 21 and rear wheels 22 are rotatably provided at the lower front edge portion and the lower rear edge portion of the suction port body 1, respectively. Further, in the central portion of the lower surface of the suction port body 1, a cross section that extends in the lateral direction is substantially inverted
A fixed brush storage portion 23 having a V shape is formed, and a fixed brush 24 is fitted in the storage portion 23.

Reference numeral 31 denotes a connecting pipe rotatably provided at the rear portion of the suction port main body, and has a rotating pipe 32 having a substantially cylindrical rear portion, and a rotating pipe 32 which is rotated at the rear portion in the circumferential direction. It is composed of a bent cylindrical connecting pipe 33 which is freely fitted and connected.

The front portion of the rotating tube 32 is formed into a semi-cylindrical portion 34 having an opening on the front surface. On both side surfaces of the semi-cylindrical portion 34, a spindle portion 35 is projected outward. Has been formed. The ventilation chamber 12 is surrounded by the opening edge portion, the side surface peripheral edge portion, and the support shaft portion 35 of the semi-cylindrical portion 34.
A seal ridge 36 that is airtightly contacted with the inner surface of the is formed to project outward.

In the semi-cylindrical portion 34, the support shaft portions 35 on both sides of the semi-cylindrical portion 34 have partition walls 10a on both sides of the ventilation chamber 12,
By being rotatably fitted in the bearing hole 37 formed in the joint portion of 10b, it is rotatably supported in the ventilation chamber 12 in the front-rear direction, and the connection pipe 33 is also provided.
Is projected rearward through the insertion port 15 of the ventilation chamber 12.

Further, the rotation range of the semi-cylindrical portion 34 is such that at least the seal protrusion 36 on the lower side of the semi-cylindrical portion 34 is brought into contact with the regulating protrusion 17 or the regulating step 18 on the lower side of the ventilation chamber 12. , Is now regulated.

Further, a plug 38 is fixedly provided on the rear portion of the outer peripheral surface of the connecting pipe 33.

Reference numeral 41 denotes a rotary brush which is rotatably provided in the rotary brush chamber 8 and is formed in a substantially columnar shape. A plurality of brush bristles 42 are planted on the peripheral surface thereof and, for example, a heater 43. Are formed to project.

Bearings 45 are rotatably fitted to the shafts 44 protruding from both end surfaces of the rotary brush 41, and these bearings 45 are formed at both ends of the rotary brush chamber 8. They are fitted and held in the groove-shaped fitting portions 46 while being prevented from rotating. The brush bristles 42 are slightly projected from the suction port 14 on the lower surface of the rotary brush chamber 8. Further, a pulley 47 is fixed to one end of the rotating brush 41.

Reference numeral 51 denotes an electric motor arranged in the electric motor housing chamber 13, which is supported on both sides by rubber supports 52. The rotating shaft 53 of the electric motor 51
A pulley 54 is fixed to the rotary shaft 5 and the pulley 54 and the pulley 47 of the rotary brush 41.
A belt 55 for transmitting the rotation of 3 to the rotating brush 41 is stretched around.

FIG. 3 is a control block diagram showing the configuration of the control circuit 56 according to an embodiment of the present invention. Reference numeral 61 denotes a rectifier circuit, which obtains a DC power source for driving the electric motor 51, and a constant voltage circuit 62 supplies power to each circuit described later. Reference numeral 63 denotes a changeover switch provided on the suction port body 1, which detects the front-back direction when the suction port body is moved forward and when it is moved rearward, and when the movement direction changes, the interface circuit 64 is used. A signal is sent to the control device 74 to switch the rotation direction of the electric motor 51 via the forward rotation driver circuit 65, the forward rotation drive device 66, or the reverse rotation driver circuit 67 and the reverse rotation drive device 68. Further, the load current detection circuit 69 of the electric motor 51
The load current is detected by and is sent to the controller 74.

Here, the structure and operation of the control device 74 will be described. An A / D converter for converting load current (analog amount) into digital and sending it to the CPU, 71 reads the state of the inverting switch SW, A CPU for switching the rotating direction of the electric motor (motor), reading the value of the load current, measuring the duration of the electric current, and rotating or stopping the electric motor, and 72 are judgment data when the CPU 71 operates. A data memory for storing (for example, a current value for operating the protection circuit, a duration of this current value, etc.), and 73 is a program memory for storing a program for operating the CPU 71.

Next, the operation of this embodiment will be described with reference to FIGS. At the time of cleaning, the connecting pipe 33 of the connecting pipe 31 is coupled to the tip end of the extension pipe 71 connected to the suction port of the electric vacuum cleaner via a hose or the like. An outlet 72 connected to the plug 38 of the connection pipe 33 is provided at the tip of the extension pipe 71, and the electric power is supplied from the electric vacuum cleaner to the electric motor 51 in the suction port body 1 by connecting the both. To be done.

At this point, the power is on (AC input IN)
Then, when the SW 63 is in the ON state, the L level is input to the control device 74 via the interface circuit 64. At this time, the electric motor 51 is programmed in the program memory 73 to rotate in the normal direction. For example, Q1 and Q3 are turned on to rotate in the normal direction. When the SW63 is in the OFF state, the control device 7
4 is input at the H level, and for example, Q4 and Q6 are turned ON and reverse rotation is performed.

On the other hand, the load current detection circuit 69 is connected to the motor 5
The load current of 1 is detected by the potential across the resistor R15, and the A / D
It is sent to the CPU via the converter to determine whether to activate the protection circuit.

The operation of the safety device for the suction inlet according to the present invention will be described below with reference to a flowchart. FIG. 5 is a flow chart showing an embodiment of the present invention. When the power is turned on and the electric motor 51 rotates, a predetermined time (for example, 1 minute)
Learns the operating current of the cleaning surface (for example, an average value) and stores it in the data memory of the control device.

This value is used as the operating current value of the safety device, and if this value is equal to or more than a predetermined value and flows for a predetermined time or more during operation, the safety device operates to stop the electric motor.

FIG. 6 is a flow chart showing another embodiment of the present invention. When the power is turned on and the electric motor 51 rotates,
During a predetermined time (for example, 1 minute), the operating current of the cleaning surface is learned (for example, an average value) and stored in the data memory of the control device.

This value is used as the operating current value of the safety device, and when this value is equal to or higher than a predetermined value and flows for a predetermined time or longer during operation, the safety device operates and stops the electric motor, as in the above-described embodiment. .

However, according to the present invention, the safety device is immediately activated and the electric motor is stopped when a predetermined current flows for a certain time or more within a predetermined time (for example, one minute).

In each of the former and latter embodiments, the average value of the load current corresponding to the cleaning surface is set in advance,
The average value and the average value read at the time of actual operation are compared to determine the type of cleaning surface.

The safety device is operated when the current obtained by adding a certain value to the average current value flows for a predetermined time.

However, in the latter case, for example, when an overcurrent flows due to foreign matter clogging the rotating brush, and when an overcurrent flows for a certain time shorter than the predetermined time without obtaining the average value of the predetermined time, an immediate safety device is used. It is operated to stop the rotation of the electric motor.

[0034]

Since the present invention is constructed as described above, it has the following effects. That is, since the operating current of the safety device is determined by the type of cleaning surface, it is possible to prevent the safety device from malfunctioning.

When an overcurrent flows for some reason, the safety device can be operated immediately and the motor can be stopped regardless of the operating current of the safety device suitable for the cleaning surface. It is possible to prevent overheating and to provide a safer safety device.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of a suction port body of the present invention excluding an upper case.

FIG. 2 is a sectional view of the same main part.

FIG. 3 is a control block diagram of the electric circuit of the same.

FIG. 4 is a similar electric circuit diagram.

FIG. 5 is a flowchart of an embodiment of the present invention.

FIG. 6 is a flowchart of another embodiment of the present invention.

[Explanation of symbols]

 1 Suction Port Main Body 41 Rotating Brush 51 Electric Motor 74 Control Device

Claims (2)

[Claims] 1. A suction port main body having a suction port, a rotary brush rotatably provided in the suction port main body facing the suction port, and a rotary brush provided in the suction port main body. In the safety device of the suction port body for an electric vacuum cleaner, which includes an electric motor for stopping the electric motor when the electric motor is in an overloaded state, stores a current value of the electric motor that changes depending on a load on each cleaning surface, Obtain the average value of the stored values for a predetermined time, determine the type of cleaning surface from the preset load and average value from the average value, and if the average value exceeds a predetermined value, stop the electric motor The safety device for the suction body for the electric vacuum cleaner, characterized in that 2. The safety of the suction port body for a vacuum cleaner according to claim 1, wherein the electric motor is stopped at a time when a current exceeding a predetermined value continues for a certain time or more within the predetermined time. apparatus.