JPS581429A - Electric cleaner - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] The present invention relates to a vacuum cleaner.

Generally, in a vacuum cleaner, when the load on the electric blower increases due to an increase in the amount of dust collected, the dust collection power decreases, so it is necessary to increase the electric blower input. Therefore, conventionally, in a vacuum cleaner with a built-in electric blower (1) as shown in Fig. 1, a circuit board (2) and a relay (3) with built-in circuit members as shown in Fig. 2 were installed at the rear of the main body. It is located inside to protect from the exhaust heat of the electric blower (1), and a manual regulator (5) is provided inside the handle (4) at the top of the main body. As shown in Figure 2, the electric blower (1) is connected to a power source via a cord reel (6) and a hand switch (7).
The relay contact (8) is opened and closed by the relay (3) based on the operation of the relay (3), and the triac (as an example of a power control element)
9) are connected in series. Here, a series protection circuit including a resistor R1 and a capacitor C1 is connected in parallel to the triac (9). And triac (9)
A trigger element (G) such as a diac is connected to the gate of , and the other end of this trigger element is connected to a fixed resistor R2, a variable resistor R3 in the manual regulator (5), and a charging capacitor C! is connected between. There is resistance in front of these
, Rs, and a hysteresis correction circuit including a capacitor CsK are connected. Therefore, the relay contact (8) is opened and closed for the power supply via the relay (3) by remote control operation of the hand switch (7) at the hand part of the hose, and when in use, it is triggered by the trigger element's cry. The input of the electric blower (1) is adjusted by a triac (9). Therefore, when the dust collection power decreases, the conduction angle of the dust collector (9) is reduced by varying the variable resistor R by operating the manual regulator (5), and the input power to the electric blower (1) is reduced. However, it is a manual adjustment and requires returning to the vacuum cleaner itself, which is troublesome.

The present invention has been made in consideration of these points, and an object of the present invention is to obtain a vacuum cleaner that can automatically control the input of the electric blower according to the load, improve cleaning efficiency, and heat the air. That is.

In the present invention, when a leak air path is formed and the load increases, the amount of air flowing through this leak air path also increases. Therefore, the present invention detects the change in the leak air amount as a resistance change using a temperature detection element. It is configured so that the input of the electric blower can be automatically controlled using signals.

A first embodiment of the present invention will be described based on FIGS. 3 and 4. Components that are the same as those shown in FIGS. 1 and 2 are designated by the same reference numerals, and description thereof will be omitted.

First, in Figure 3, from the suction port α to the filter (2)
A dust collection intake air passage is formed through which air is taken in, and a leak air passage (2) is formed which communicates with the dust collection intake air passage (to) and communicates with the outside air through a leak hole a4. It is formed. A temperature detection element (b) such as a Hiro thermistor is installed in this leak hole 0 so as to receive the leakage air volume. As shown in FIG. 4, its circuit configuration is such that a series circuit of a semi-fixed resistor B4 and a temperature detection element RTa is connected in parallel to the semi-fixed resistor B4.

Here, the temperature detection element (2) is simply shown as RT, but in reality, a correction circuit is added inside the element so that only the slope of the attenuation from the current temperature can be detected.
T is simplified to include this correction effect. Further, the semi-fixed resistors R1 and R6 are for manufacturing adjustment.

In such a configuration, the conduction phase angle of the triac (9) is set based on the semi-fixed resistor R3, the bird, etc.
The input of this triator (9) is controlled. Therefore, during suction operation, if the pressure loss in the dust collection intake air passage (to) is small and the intake air volume is large, leakage may occur. The leak air sucked in from the hole α◆ is rounded, with a small amount of leak air in the air path (b), and the resistance change of the temperature detection element BT (b) is small, making the electric blower (1)
The input is maintained and controlled in the initial state.

However, when the amount of dust collected increases and the intake air volume of the dust collection intake air passage (2) decreases and the load increases, the leak air volume of the leak air passage (2) that is sucked in from the leak hole α◆ will increase. At this time, the temperature detection element RTα is located in the leak air path (2) and receives the leak air volume, so that
As it cools down, its resistance attenuates and changes, making the triac (9) O conduction phase angle smaller than the initial state and increasing the input to the electric blower (1). This operation can be increased up to the upper limit of the rating of the electric blower (1). In this way, during cleaning, the temperature detection element R? Since the input to the electric blower (1) is dynamically adjusted based on (b), cleaning efficiency can be improved without any troublesome operations.

Next, a second embodiment of the present invention will be explained with reference to FIG. This embodiment uses a manual regulator (6) as shown in FIG. B4 can be changed over using a changeover switch. Thereby, input control of the electric blower (1) can be performed either automatically or manually. Therefore, regardless of load fluctuations, delicate areas can be appropriately cleaned by manual control as needed. Here, in Fig. 5, the switching switch f-α is replaced by the manual adjuster (
Although it is shown as a volume with a switch linked to 5), it may be provided separately (the same applies to the following embodiments).

Further, a third embodiment of the present invention will be explained with reference to FIG.

Like the second embodiment, this embodiment also uses a combination of automatic and manual control, in which the variable resistance island of the manual regulator (5) and the temperature detection element at (b) are connected in series, and the temperature detection element at (b) is connected in series. RTH
A switching input f(L?) is connected in parallel to the .

As a result, during automatic control using one temperature detection element (10), the upper limit range that is automatically adjusted by this is controlled by the variable resistor R2. In other words, when the switching switch When , the temperature detection element RT
(B) is short-circuited and manual control is required by the manual regulator (5). When the switching switch is turned OFF, the temperature detection element R
It is automatically controlled by TO4, but the upper limit is variable resistor R1.
It is variably controlled according to the value of . Therefore, even if the input increases as needed, it can be manually adjusted within a range that does not interfere with cleaning, and cleaning can be performed with peace of mind.

Furthermore, a fourth embodiment of the present invention will be explained with reference to FIG. This embodiment also employs a combination system, 6, in which a series circuit of a temperature detection element BT (b), a semi-fixed resistor B-, and a switching switch PH is connected in parallel to a variable resistor Rγ. This results in
When the switching switch fα is turned on, the temperature detection element BT (g)
When performing automatic control, the lower limit range of the automatically adjusted input is controlled by the variable resistor RyK of the manual regulator (5).

Therefore, if there is something left behind such as something with a large specific gravity that causes trouble during cleaning, the lower limit of the input control can be adjusted to the point where nothing is left behind even during automatic adjustment. be.

As described above, the present invention provides a temperature detection element whose resistance value is varied according to the airflow rate in the leak air path, and connects this to the power control element for input control of the electric blower. The input of the electric blower can be automatically controlled according to fluctuations, and cleaning efficiency can be improved with a simple circuit configuration without manual operation, and the reliability of the control can also be improved. be.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway side view showing a conventional example, Fig. 2 is a circuit diagram thereof, Fig. 3 is a partially cutaway side view showing a first embodiment of the present invention, and Fig. 4 is its circuit. 5 is a circuit diagram showing a second embodiment of the invention, FIG. 6 is a circuit diagram showing a third embodiment of the invention, and FIG. 7 is a circuit diagram showing a fourth embodiment of the invention. It is a circuit diagram. DESCRIPTION OF SYMBOLS 1... Electric blower, 9... Triac (power control element), 13... Air intake retreat path for dust collection, 15... Leak air path, 16... Temperature detection element June 26, 1939 Inventor: Tomo Yoshioka
People Tokyo Electric Co., Ltd.

Claims (1)

[Claims] A leak air path is formed that communicates with the outside air and the intake air path for dust collection, and a temperature detection element whose resistance value is variable according to the amount of leak air is provided in the middle of this leak air path, and this temperature detection element is connected to an electric blower. A vacuum cleaner 0 characterized in that the vacuum cleaner is connected to a power control element that controls the input of the vacuum cleaner 0.