JPS6223429Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a vacuum cleaner that is equipped with a lamp for illuminating the surface to be cleaned and in which the rotational speed of an electric blower is switched between high and low speeds by means of a tap on a field coil.

Conventionally, in this type of vacuum cleaner, the lamp was often connected directly to the input power source, and for this reason, as a lamp for this lighting, in Japan
100V light bulbs were used, and in foreign countries around 200V light bulbs were used. In addition, these light bulbs were small in size, ie, had low power consumption, so that they could be built into vacuum cleaners. Since this lamp is used in a place with low power consumption and high input voltage, the filament needs to be made thin and long. The drawback is that the filament easily breaks due to the resulting resonance. Therefore, in order to extend the life of the lamp, a field coil tap for electric blower speed switching is used, and by connecting both terminals of the lamp to this tap, the voltage applied to the lamp is reduced to about 10 to 30V, and A vacuum cleaner with a thicker and shorter lamp filament was proposed. However, this vacuum cleaner
When switched to "Strong", the only power source for the lamp that can be obtained is the electromotive force electromagnetically induced by the field coil, and the electromotive force of the field coil is small, so the brightness of the lamp when switched to "Strong" As a result, even though the frequency of use is higher in "Strong" than in "Low", the lamp brightness becomes much darker in "Strong". It felt strange, and there was a new problem in that if a lamp was selected to be suitable for the "weak" setting, but cleaning was done in the "strong" state, sufficient brightness could not be obtained.

Therefore, the purpose of this invention is to provide a vacuum cleaner that extends the lamp life and provides the same lamp brightness even when the electric blower is switched between high and low power.

An embodiment of this invention will be described with reference to FIGS. 1 to 3. That is, this vacuum cleaner is as shown in Figs. 1 and 2, and 1 has a suction port 1 on the front with a built-in rotating brush 2 for removing dust attached to the hair of carpets, rugs, etc. A back plate 3 having an air intake port (not shown) is fixed to the front lower part thereof, and a front wheel 4 is provided at the rear of the back plate 3. 5 is a vacuum cleaner body with a built-in electric blower 6 at the bottom and a dust bag 7 at the top;
It is rotatably connected to the suction port 1 by.
Reference numeral 8 denotes a handle for operating the vacuum cleaner back and forth, which has a handle 9 at the top and is attached to the vacuum cleaner main body 5 with screws 10 at its lower end. Reference numeral 11 denotes a rotating shaft taken out from the electric blower 6, which drives the rotating brush 2 via a belt 12. A hose 13 is connected to the cleaner body 5 and the suction port 1, and guides dust from the suction port provided on the back plate 3 into the dust bag 7. 14 is a rotatable rear wheel fixed to the cleaner body 5. 15 is a power switch, and 16 is a window with a built-in lamp 17 for illuminating the floor. Reference numeral 18 denotes a strength changeover switch for changing the speed of the electric blower 6 by tapping the field coil.

FIG. 3 shows a circuit diagram of this embodiment.
a is the field coil end of the electric blower 6, 6b, 6
C is the middle tap, and the lamp 17 is connected to the field coil end 6a and the middle tap 6c, and the weak speed terminal 18a and the strong speed terminal 18b of the strong/weak changeover switch 18 are connected to the field coil end 6a and the middle tap, respectively. It is connected to tap 6b. In this case, the intermediate tap 6b is connected to the other intermediate tap 6c.
It is located closer to the field coil end 6a than the field coil end 6a. In addition, E
is the power source.

Next, the operation of this vacuum cleaner will be explained. That is, when the strength changeover switch 18 is switched to the field coil end 6a side, the electric blower 6 rotates at a low speed, that is, "weak", and when it is switched to the intermediate tap 6b side, it becomes high speed, that is, "strong". Now, the impedance between the field coil end 6a and the intermediate tap 6b is _Z1 , the voltage between them is _V1 , the impedance between the intermediate tap 6b and the intermediate tap 6c is _Z2 , the voltage between these is V2, and the voltage between them is _V1 . The impedance from the tap 6c to the field coil end on the opposite side of the intermediate tap 6a is set to _Z3 , and the voltage of the power source E is set to _V0 .

If the voltage V ₁ at "weak" is V _1L , then the voltage V _1L
is V _1L = Z ₁ / Z ₁ + Z ₂ + Z ₃ V ₀ , and if the voltage V ₁ at "strong" is V _1H , the voltage V _1H is V _1H = μ x Z ₁ / Z ₂ + Z ₃ V ₀ becomes.

Although Z ₁ /Z ₁ +Z ₂ +Z ₃ <Z ₁ /Z ₂ +Z ₃ , since μ (permittivity) of the electric motor is approximately 0.5 to 0.6, V _1L >V _1H . In other words, if the lamp 17 is connected between the field coil end 6a and the intermediate tap 6b, the
becomes brighter.

Next, if the voltage V ₂ at "weak" is V _2L and the voltage V ₂ at "strong" is V _2H , then V _2L = Z ₂ /Z ₁ +Z ₂ +Z ₃ V ₀ V _2H = Z ₂ /Z ₂ +Z ₃ V ₀ , and since Z ₂ /Z ₁ +Z ₂ +Z ₃ <Z ₂ /Z ₂ +Z ₃ , V _2L <V _2H . In other words, intermediate tap 6b and intermediate tap 6
When the lamp 17 is connected between C and C, the lamp 17 will be brighter when it is set to "strong" than when it is set to "weak".

Next, as in this embodiment, the field coil end 6
When the lamp 17 is connected between a and the intermediate tap 6c, the voltage V _L applied to the lamp 17 when it is "weak" and the voltage V _H when it is "strong" are respectively V _L = V _1L + V _2L V _H = V _1H +V _2H .

As mentioned above, since V _1L > V _1H V _2L < V _2H , the impedances of Z ₁ and Z ₂ can be freely changed by arbitrarily changing the positions of the intermediate taps 6b and 6c, and V ₁ = V _H can be created. In other words,
The brightness of the lamp 17 can be made the same between "strong" and "weak". Note that the above equation does not take into account the impedance of the lamp 17 itself, and the permittivity μ also varies depending on the motor, so it is best to determine the positions of the intermediate taps 6b and 6c experimentally.

Thus, according to this embodiment, lamp 17
Since the filament is connected to the field coil end 6a and the intermediate tap 6c, the filament can be made thicker and shorter, and the filament will not easily break due to the vibration of the actual use of the vacuum cleaner or the vibration of the electric blower 6, thus maintaining a long life and making the electric blower 6 more durable. Even if you switch to “Strong” or “Weak”,
The brightness of the lamps 17 can be made the same, which has great practical value.

As described above, the vacuum cleaner of this invention includes a field coil of an electric blower, first and second intermediate tap terminals provided in this order at the ends of the field coil,
a strength changeover switch for selectively applying a power supply voltage to the terminal end of the field coil and the first intermediate tap terminal; and a cleaning surface connected between the terminal end of the field coil and the second intermediate tap terminal. Since it is equipped with an illumination lamp, the lamp life can be extended, and the same brightness can be obtained even when the electric blower is switched to "strong" or "weak".

[Brief explanation of the drawing]

FIG. 1 is a perspective view of an embodiment of this invention, FIG. 2 is a sectional view thereof, and FIG. 3 is a circuit diagram of this embodiment. 6...Electric blower, 6a...Field coil end, 6b, 6c...Intermediate tap, 17...Lamp, 18...Intensity changeover switch.

Claims (1)

[Scope of utility model registration request] A power supply voltage is selectively applied to a field coil of an electric blower, first and second intermediate tap terminals provided in order from the terminal end of the field coil, and the terminal end of the field coil and the first intermediate tap terminal. a strong/weak switch for applying voltage, and a terminal end of the field coil and the second
A vacuum cleaner equipped with a lamp for illuminating the cleaning surface connected between the middle tap terminal of the vacuum cleaner and the intermediate tap terminal of the vacuum cleaner.