KR20060118049A - Apparatus for measurement and display of motor rotation numbers in a vacuum cleaner - Google Patents

Abstract

A device for measuring and displaying rpm of a motor in a vacuum cleaner is provided to prevent breakage of the motor by detecting overheat of the motor and rpm of the motor and regulating the vacuum cleaner according to rpm of the motor. A motor rpm measuring and displaying device of a vacuum cleaner includes an rpm detection unit(140) for measuring rpm of a motor(112) generating rotational power, a signal converting unit(146) converting an analog signal from the rpm detection unit into a digital signal, and an rpm display unit for displaying the digital signal from the signal converting unit. The rpm detection unit has a reflecting plate(142) fixed in a central shaft(112') of the motor and rotated to selectively reflect light, and a rotation detector(144) spaced from the reflecting plate so as to project light to the reflecting plate and so as to output an electric signal according to reflection of light.

Description

Apparatus for measurement and display of motor rotation numbers in a vacuum cleaner}

1 is a perspective view showing an appearance configuration of a general vacuum cleaner.

Figure 2 is a side view of a vacuum cleaner employing a preferred embodiment of the motor rotation speed measurement and display device of the vacuum cleaner according to the present invention.

Figure 3 is a side cross-sectional view of the vacuum cleaner main body showing the installation state of the rotation speed detecting means constituting a preferred embodiment of the motor rotation speed measurement and display device of the vacuum cleaner according to the present invention.

4 is a plan view of the reflection plate of the rotational speed sensing means of the embodiment of the present invention.

Figure 5 is a schematic view showing the configuration and operating state of the rotation speed detecting means constituting an embodiment of the present invention.

Figure 6 is a block diagram showing a state in which the embodiment of the present invention operates.

7 is a flowchart showing a lighting process of numbers displayed on the rotation speed display means of the embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

50. Vacuum cleaner 60. Suction nozzle

70. Main unit 75. Extension tube

80. Handle 90. Extension Hose

100. Main body case 102. Bulkhead

110. Motor compartment 112. Motor

114. Front Supports 116. Rear Supports

120. Dust collection chamber 122. Dust collection filter

130. Wheels 132. Second Wheel

140. Speed detection means 142. Reflector

144. Rotation Detector 144 '. Light emitting element

144 ". Light receiving element 146. Signal converting means

150. Speed display means

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vacuum cleaner, and more particularly, to a rotation speed measurement and display device for a vacuum cleaner motor having a means for measuring and digitally displaying the rotation speed of the motor.

1 shows a configuration of a general vacuum cleaner. As shown in the drawing, the vacuum cleaner includes a main body 1 having suction means for sucking air in the room, and a suction nozzle 2 into which air on the bottom surface is introduced by suction force generated in the main body 1. Has a configuration to include.

On the other hand, the main body 1, the lower body (5) to which the suction means is received and fastened, and the parts embedded in the lower body (5) so as not to be exposed to the outside, the electric part for controlling the vacuum cleaner (not shown) It consists of an upper body (6) is built.

In addition, wheels 8 are fastened to both sides of the body so that the main body 1 can smoothly move the bottom surface, and the wheels 8 are sucked through the suction nozzle 2 and then filtered air is received from the main body ( The discharge part 8a discharged | emitted from 1) is formed.

Between the main body 1 and the suction nozzle 2, a suction hose 3b made of a flexible material, an operation unit 4 connected to an end of the suction hose 3b, and the operation unit 4 ) And an extension tube 3a for connecting the suction nozzle 2 are sequentially installed, so that the suction force generated in the main body 1 can be transmitted to the suction nozzle 2.

Therefore, when electricity is applied through the wire 9 connected to the power supply unit (not shown) built in the main body 1, the vacuum cleaner is in a standby state. At this time, if the user adjusts the suction step by using the button of the operation unit 4, the suction force suitable for each step is generated by the suction means built in the main body.

The suction force generated through the suction means is transmitted to the suction nozzle 2 via the suction hose 3b and the extension pipe 3a which are fastened to the suction connector 3c. The air containing the foreign matter such as dust or lint is sucked by the suction force transmitted to the suction nozzle 2, and the air containing the fine dust and the like is separated by the dust collecting container 10 from the sucked air. The cleaning is performed while discharging to the outside of the main body 1 through 8a).

However, the vacuum cleaner structure of the prior art as described above has the following problems.

That is, the main body 1 is provided with a motor (not shown) for generating a suction force, but there is no device for measuring the number of revolutions of the motor and displaying it externally, such that the motor is damaged due to overheating of the motor. There is this.

Therefore, an object of the present invention is to solve the problems in the prior art as described above, the motor rotation of the vacuum cleaner is provided with a rotation speed detection means for measuring the motor rotation speed and the rotation speed display means for displaying the measured rotation speed To provide a number measuring and display device.

According to a feature of the present invention for achieving the above object, the present invention includes a rotation speed detection means for measuring the rotation speed of the motor for generating a rotational power; Signal conversion means for converting an analog signal generated by the rotation speed detection means into a digital signal; And rotation speed display means for displaying a signal converted into a digital signal by the signal conversion means to the outside.

According to such a structure, there exists an advantage that the motor damage of a vacuum cleaner can be prevented beforehand.

Hereinafter, with reference to the accompanying drawings, a preferred embodiment of the motor rotation speed measurement and display device of the vacuum cleaner according to the present invention will be described in more detail.

Figure 2 shows a side view of a preferred embodiment of the vacuum cleaner employing the motor rotation speed measurement and display device of the vacuum cleaner according to the present invention, Figure 3 is a side cross-sectional view of the main body of the vacuum cleaner employing an embodiment of the present invention is shown have.

As shown in these figures, the vacuum cleaner 50 moves along the bottom surface and sucks the air containing foreign matter through the suction nozzle 60 and the suction nozzle 60. The main body 70 for generating a suction force to be installed, one end is connected to the suction nozzle 60, the extension tube 75 is adjustable in length, and formed on one end of the extension tube 75 can be easily grabbed by the user The handle 80 is configured to be configured so as to be flexible between the handle 80 and the main body 70, and an extension hose 90 for guiding air and foreign matter.

The main body 70 is to collect the sucked foreign matter after inhaling the foreign material by generating a suction force, as shown in Figure 2 the main case consisting of the upper case (100 ') and lower case (100 ") ( The appearance is formed by 100).

The main body 70 is divided into the front and rear by the partition wall 102, the motor chamber 110 is provided with a motor 112 for generating rotational force to generate a suction force, and in the motor chamber 110 The dust collecting chamber 120 is provided with a dust collecting filter 122 for collecting the foreign matter introduced with the air by the suction force generated.

As shown in FIG. 3, the motor chamber 110 includes a front support 114 supporting the impeller 112 'of the motor 112 and a rear support for fixing the rear end of the motor 112. 116 are connected to each other in the upper / lower case (100 ', 100 ").

The main body 70 is further provided with a moving wheel 130 to facilitate the movement, the bottom surface of the front end of the main body 70 assists the moving wheel 130 to facilitate the movement of the main body 70 The auxiliary wheel 132 is formed in a relatively smaller size than the moving wheel 130.

A hose coupling part 134 to which one end of the extension hose 90 is fitted is formed at the front end of the main body case 100, and the partition 102 guides the air passing through the dust collecting filter 122 to the rear. The air inlet 136 is formed through the front and rear and a plurality of air discharge holes 138 through which the purified air is discharged through the back of the main body case 100 is formed.

Meanwhile, one end of the central shaft 112 ′, which is a rotation center of the motor 112, is supported by the rear support 116. That is, the rear end of the motor 112, the central axis 112 'is formed extending, the rear end of the central axis 112' is supported by the rear support 116.

The rear side of the motor 112, the rotation speed detecting means 140 for measuring the rotation speed of the motor 112 is installed. The rotation speed detecting unit 140 is fixed to the central axis 112 ′ of the motor 112 and rotates, and reflecting plate 142 selectively reflects light scanned from the light emitting device 144 ′, which will be described below. And a rotation sensor 144 spaced apart from the reflecting plate 142 to scan light onto the reflecting plate 142 and generate a predetermined electrical signal according to the amount of reflected light.

In more detail, a reflector plate 142 is installed between the motor 112 and the rear support 116, and the reflector plate 142 is fixed to the central axis 112 ′ to rotate together with the motor 112. .

The reflecting plate 142 is for reflecting light, and has a disk shape as shown in detail in FIG. 4, and is divided into four parts and includes a reflecting unit 142 ′ and an absorbing unit 142 ″. 142 is an annular (or disc-shaped) sheet mounted on the central axis 112 'of the motor 112, and two colors (black and white in the illustrated example) having different reflectances of light are circumferentially on the surface. The white colored portion is a reflecting portion 142 'reflecting the light scanned from the light emitting element 144', which will be described later, and the black colored portion does not reflect the light. Non-absorbing portion 142 ".

The rear side of the reflector plate 142 is provided with a rotation sensor 144 to measure the rotational speed of the motor 112 spaced apart by a predetermined interval. 3 and 5, the rotation sensor 144 is mounted to the rear support 116 and is disposed to face the reflective plate 142 so as to face the light emitting device 144 ′ and the light receiving device 144. ").

Thus, as shown in FIG. 5, the light emitting element 144 ′ scans light of a predetermined intensity onto the reflecting plate 142, and the light receiving element 144 ″ senses light reflected by the reflecting plate 142. And generates an electric analog light receiving signal whose peak value is variable according to the amount of light detected.

A signal converting means 146 is provided below the rotation sensor 144. (See FIG. 3) The signal converting means 146 digitally converts an electrical analog signal generated from the light receiving element 144 ". The AD converter is used as the signal conversion means 146. Since the structure and operation of the AD converter are generally known, detailed description thereof will be omitted.

The number converted into digital by the signal converting means 146 and output is displayed on the rotation speed display means 150 to the outside and displayed. The rotation speed display means 150 is made of a digital display for displaying a number, it is preferably formed on the front of the handle (80).

The rotation speed display unit 150 may be configured of a light emitting diode (LED), a liquid crystal display (LCD), or the like. The number displayed on the rotation speed display means 150 is configured to be turned on when the motor 112 has a predetermined rotation speed or more.

That is, although not shown, a display control unit is further provided at one side of the rotation speed display means 150 to display a number when the rotation speed of the motor 112 is greater than or equal to a predetermined rotation speed (LED: light emitting). diode) is turned on to warn the user of danger.

Looking at the operation of the vacuum cleaner having the configuration as described above as follows.

First, in case of cleaning, the suction nozzle 60 is brought into close contact with the floor to be cleaned, and then, when power is applied to the motor 112, the suction force is generated by the motor 112.

Air containing foreign matters such as dust is introduced into the suction nozzle 60 by the suction force generated by the motor 112, and then passes through the extension pipe 75 and the extension hose 90 in sequence and then of the main body 70. It is introduced into the dust collecting chamber 120.

The foreign matter in the air sucked into the dust collecting chamber 120 is collected by the dust collecting filter 122, the filtered air is passed through the dust collecting filter 122, the air inlet 131 of the partition wall 102 After being introduced into the motor 112 through the discharged into the motor chamber 110. Subsequently, the air discharged into the motor chamber 110 is discharged to the outside through the air discharge hole 138 formed through the rear of the motor chamber 110.

Meanwhile, referring to FIGS. 3 to 6, the operation of the apparatus for measuring and displaying the rotation speed of the motor 112 according to the operation of the vacuum cleaner as described above will be described first. By rotating, the reflecting plate 142 also rotates at the same time.

In this case, power is also applied from the outside to the rotation sensor 144 so that light is scanned from the light emitting device 144 '. The light scanned by the light emitting element 144 'is reflected by the reflecting portion 142' of the reflecting plate 142 and sensed by the light receiving element 144 ".

The light receiving element 144 "generates an analog light receiving signal according to the amount of light sensed. Here, the amount of light reflected by the reflector 142 reflects the light scanned by the light emitting element 144 '. The peak value of the analog light receiving signal is changed according to the rotation of the wheel.

The analog light receiving signal generated by the light receiving element 144 "is transmitted to the signal converting means 146 and converted into a digital signal. That is, the analog signal generated by the light receiving element 144" is The number is changed to be displayed on the rotational speed display means 150 formed on the handle 80.

The display control unit (not shown) provided at one side of the rotation speed display means 150 determines whether the rotation speed display means 150 is turned on according to the rotation speed of the motor 112. That is, as shown in the flowchart of FIG. 7, the rotation speed display means 150 when the rotation speed of the motor 112 is greater than the effective upper limit value X by comparing the rotation speed of the motor 112 with the effective upper limit value X already set. Make sure the number displayed on) lights up.

When the number displayed on the rotation speed display means 150 is turned on because the rotation speed of the motor 112 is excessive, the user may adjust the operation state of the vacuum cleaner to lower the suction force or to temporarily stop the operation of the vacuum cleaner. It is possible to prevent breakage due to overheating of the motor 112.

The scope of the present invention is not limited to the above-exemplified embodiments, and many other modifications based on the present invention will be possible to those skilled in the art within the above technical scope.

For example, in the above embodiment, the rotation speed display means 150 is formed on the handle 80, but the rotation speed display means 150 is formed on the outer circumferential surface of the main body 70. The configuration may be possible.

In addition, in the above embodiment, when the rotation speed detecting means 140 is composed of a rotation sensor 144 provided with a light emitting element 144 'and a light receiving element 144 "and a reflecting plate 142 reflecting light. Exemplary embodiments of the present invention may be configured such that the rotational speed of the motor 112 is directly counted mechanically and appears on the rotational speed display means 150.

In the above embodiment, when the number of revolutions of the motor 112 becomes equal to or greater than the effective upper limit value X, the number displayed on the number of revolutions display means 150 is turned on. In this case, the number of revolutions is displayed. In addition to the lighting means 150 is a variety of changes such as to make a separate buzzer (buzzer) is possible, of course.

In the motor rotation speed measurement and display device of the vacuum cleaner according to the present invention as described above, the rotation state of the motor provided in the main body of the vacuum cleaner is measured and the rotation state of such a motor is displayed to the outside.

Therefore, according to the present invention, the user can easily recognize whether the motor is overheated, there is an advantage that can prevent the damage of the motor in advance. That is, the user can easily recognize the rotational speed of the motor through the rotational speed display means formed on the handle, so that when the number displayed on the rotational speed display means is turned on because the rotational speed of the motor is higher than the effective upper limit value, the vacuum By adjusting the operating state of the cleaner to prevent damage to the motor.

Claims (6)

Rotational speed sensing means (140) for measuring the rotational speed of the motor (112) for generating rotational power; Signal conversion means (146) for converting an analog signal generated by the rotation speed detection means (140) into a digital signal; Measuring the motor rotation speed of the vacuum cleaner, characterized in that it comprises a rotation speed display means 150 for displaying a signal converted into a digital signal by the signal conversion means 146 to the outside And display. The method of claim 1, wherein the rotation speed detecting means 140, A reflector plate 142 fixed to the central axis 112 ′ of the motor 112 and rotating to selectively reflect external light; The vacuum is characterized in that it comprises a rotation sensor 144 is spaced apart from the reflecting plate 142, scans the light to the reflecting plate 142 and generates a predetermined electrical signal according to the amount of reflected light Motor speed measurement and display of vacuum cleaner. The method of claim 2, wherein the rotation sensor 144, A light emitting element 144 'for scanning light onto the reflecting plate 142; And a light receiving element (144 ") for receiving the light reflected by the reflecting plate (142). The method of claim 1, wherein the rotation speed display means 150 is a light emitting diode (LED) or an LCD (Liquid Crystal Display) characterized in that the motor rotation speed measurement and display device of the vacuum cleaner. [5] The method of claim 1 or 4, wherein the number displayed on the rotation speed display means 150 is turned on when the motor 112 is greater than or equal to a predetermined rotation speed. Display. [5] The apparatus for measuring and displaying the motor speed of a vacuum cleaner according to claim 1 or 4, wherein the rotation speed display means is provided in a handle (80) or a main body (70) of the vacuum cleaner.

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