JP3287206B2 - Electric vacuum cleaner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vacuum cleaner using a pressure sensor for detecting a pressure in the vacuum cleaner.

[0002]

2. Description of the Related Art A conventional pressure sensor for controlling an electric blower mainly uses a semiconductor pressure sensor. The semiconductor pressure sensor is small and lightweight and has excellent environmental resistance such as humidity.

Further, since a silicon film is used, the pressure receiving area for sensing and the fluctuation range of the pressure receiving film are also small, and the amount of movement of air inside the sensor is small with respect to the pressure change on the load side. It has a structure that is resistant to dust that has almost no respiratory action and no entry of dust. The linearity with respect to the input is good, but the variation is large, adjustment and correction are always required, the price including peripheral circuits is high, and it can be used only for controlling a vacuum cleaner with a high selling price. Therefore, the development of a pressure sensor that can be used for low-cost products was needed.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to use a bellows such as an elastic rubber film having a large moving amount as a pressure receiving portion, and convert the pressure into a physical quantity such as resistance, capacitance or reactance. An object of the present invention is to provide a vacuum cleaner having a structure of a sensor and preventing dust from entering the pressure sensor.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention is characterized in that a cleaner body having an electric blower and a dust collecting filter for collecting dust sucked by a suction airflow of the electric blower. And a suction body connected to communicate with a dust collection filter in the cleaner body, comprising: a pressure sensor for detecting pressure in the vacuum cleaner; and to form a space between the dust collecting filter and the intake port, to position the pressure inlet of the pressure sensor in the space, substantially cylindrical in pressure inlet of said pressure sensor
Is provided, and a dustproof filter is provided inside the chamber .

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a diagram showing the overall construction of a vacuum cleaner, which is a vacuum cleaner comprising a suction port 1, an extension pipe 2, a hose 3, and a vacuum cleaner main body 4. As shown in FIG. 2, the cord reel device including a lower case 5, an upper case 6, a dust collecting case 7, and a circuit case 8, which incorporates the electric blower 39 and the power cord 9 and accommodates the inside of the main body, includes The upper case 6 is fitted and fixed in an airtight manner.

The dust collecting case 7 has a rear end rotatably fixed to the upper case 6 and a paper bag filter 11 inside the main body suction opening 12 located at the front part of the lower case 5.
, And is fixed by the filter holder 14.

The electric blower 39 is supplied with power via a cord reel device and a drive circuit 15.

The lower case 5 is provided with an electric blower 3 which is supported by the lower case 5 by vibration damping rubber 16 and rear vibration damping rubber 17.
The entire surface of the front vibration isolating rubber 16 is supported in contact with a ring-shaped motor support 18. On substantially the upper surface of the motor support 18, there is a chamber 20 having a substantially cylindrical main body pressure intake port 19, and the dustproof filter 21 is not sucked into the electric blower 39 in the chamber 20.
A filter support rib 22 is provided.

The inside of the chamber 20 has a structure in which a dust-proof filter 21 having air permeability such as a nonwoven fabric or a sponge but having air for filtering dust is held in the form of a sheet or a block, or a combination of a sheet and a block.

The pressure sensor 23 is mounted on a control board 53 and is press-fitted into a sensor tube mounting port 24 provided in the upper case 6 via a flexible sensor tube 28 for transmitting pressure.

Control board 5 to which pressure sensor 23 is attached
Upper case 6 with 3 incorporated and covered by circuit case 8
When combined with the lower case 5, a hollow substantially cylindrical pressure intake chamber 2 is formed at both ends of the lower case 5.
Numeral 0 is integrally formed of a bumper effect on the outer periphery of the main body, a filter packing effect of the dust collecting chamber, and a seal packing 25 between the pressure capturing chamber 20 of the lower case 5 and the upper case 6, as shown in FIG. The upper case 6 has a structure that fits tightly into the concave sensor tube mounting port 24.

As shown in FIG. 4, the structure of the pressure sensor 23 of the present embodiment is such that an electric blower 39 and a pattern resistance substrate 42 of which the resistance value changes due to a load change of the electric blower 39 are moved in contact on the substrate 42. A conductive spring 45 electrically connecting the sliding element 43 and the electrode 44 so as to be able to expand and contract; a return spring 46 provided on the outer circumference of the sliding element 43 with the substrate 42; The other is made of a flexible material such as rubber or plastic.

A bellows 40 which is a pressure receiving portion for airtightly separating the sensor internal space 33 from the atmosphere and the bellows 40
Is airtightly fixed to the upper surface of the cylindrical sensor body 47.

Further, a seal cap 48 having an atmospheric pressure inlet 54 for introducing atmospheric pressure to the surface of the bellows 40 opposite to the sensing side, a sensor internal space 33 for connecting the sensor body and a pressure measuring point of the vacuum cleaner, and the like. The pressure sensor 23 constituted by the pressure receiving port 49 of the sensor main body provided on the surface of the communication sensor is used for assembling.
Control board 53 on which the pressure sensor 23 is mounted as shown in FIG.
Through the sensor tube 28, the electric air blower inlet 50 of the cleaner body 4 and the paper bag filter 11 in the dust collection chamber 51.
It is arranged in a part of a space which is relatively insensitive to dust and surrounded by a motor front space 52 which is isolated from the above.

A dustproof filter 21 such as a nonwoven fabric or a sponge is provided inside the pressure receiving chamber 20 provided on the upper surface of the support of the front rubber 16 as shown in FIG. Then, during the cleaning, fine blow-through dust passing through the paper bag filter 11 inside the dust collection chamber 51 and the motor protection filter 26 provided between the electric blower 39 and the paper bag filter 11 is generated due to the load fluctuation. The dust filter 21 can prevent the blow-by dust from entering the inside of the pressure sensor 23 by the suction and discharge movement of the air due to the volume change by the bellows 40 inside the pressure sensor 23.

The size of the chamber 20 is set to be equal to or larger than the volume of the sensor internal space 33, thereby preventing the bellows 40 from changing the volume inside the pressure sensor 23.

As shown in FIG. 8, one end is provided on the upper wall surface 27 from the center of the electric blower 39 in the motor front space 52 so that the opening surface is directed vertically or downward. In order to sense the pressure by connecting to the sensor 23 and to control optimally according to the load state by the control board 53, the rotational speed of the electric blower 39 is controlled to obtain the optimal operating force and suction force.

In operation, when the electric blower 39 is driven and cleaning is started, the pressure sensor 23 is changed according to the state of the floor.
The load fluctuation during cleaning is detected by a sensor as shown in FIG. 11, and the operation of the electric blower 39 optimal for the load is controlled by a control block as shown in FIG.

The main body pressure intake port 1 of the pressure sensor 23
Numeral 9 is provided between the electric blower 39 and the suction tool which is a load of the cleaner as shown in FIG.

As shown in FIGS. 9 and 10, a pressure change due to a change in the load of the cleaner is caused by a change in the sensor internal space 33.
Changes in the same way. When the load becomes heavy, a negative pressure is generated with respect to the atmospheric pressure as shown in FIG.
When the load becomes light, the pressure returns to a pressure close to the atmospheric pressure as shown in FIG.

With the repetitive change of the pressure, floating dust floating near the main body pressure intake 19 of the pressure sensor 23 and the pressure sensor 23 and the main body pressure intake 19
The dust accumulated or mixed in the inside of the sensor tube 28 gradually moves and mixes inside the pressure sensor 23 by air movement.

In order to prevent the dust from being mixed, as another embodiment, a dust filter 21 for preventing dust from being mixed is installed in the pressure sensor 23 as shown in FIG. A sensor tube is provided at both ends between the intake port 19 and the pressure sensor 23, and a chamber 20 having a larger volume than the sensor internal space 33 in the pressure sensor 23 or a labyrinth 55 alone as shown in FIG. As shown in FIG. 17, a dust filter 21 is combined with the inside of the chamber 20.

As another embodiment, as shown in FIG. 13, a flexible dust-blocking film 36 made of rubber or the like is provided on the side of the vacuum cleaner pressure inlet in the sensor.

Further, as shown in FIG. 14, the dust blocking film 36 has a structure in which a plurality of fine holes are provided in order to prevent a residual pressure in the closed space due to a long-term pressurization or a change in temperature and pressure.

As shown in FIG. 19, a long sensor tube in which the movement of air for moving and transporting dust due to a change in the volume of the sensor internal space 33 of the pressure sensor 23 is set to be equal to or larger than the sensor internal space of the pressure sensor 23. 28 and the like can be prevented.

By absorbing the volume change of the internal space of the pressure sensor by the bellows 40 by the above structure, it is possible to prevent dust from entering the inside of the sensor and prevent the pressure sensor 23 from being caused by dust.

According to the present embodiment, in the pressure sensor which moves the pressure receiving film used in the vacuum cleaner, it is possible to prevent dust from entering the inside of the pressure sensor and to prevent the pressure sensor from locking due to dust and lowering the sensitivity. Can be prevented.

[0029]

According to the present invention, in a pressure sensor involving movement of a bellows used in a vacuum cleaner, it is possible to prevent dust from entering the inside of the pressure sensor and to prevent problems such as locking of the pressure sensor due to dust and reduction in sensitivity. It is possible to maintain the initial characteristics of control by the pressure sensor of the vacuum cleaner.

[0030]

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of a vacuum cleaner according to the present invention.

FIG. 2 is a sectional view of the main body of the present invention.

FIG. 3 is a sectional view of a main part of the main body of the present invention.

FIG. 4 is a sectional view of a sensor used in the present invention.

FIG. 5 is a schematic view of one embodiment of the present invention.

FIG. 6 is a sectional view of a main part of an embodiment of the present invention.

FIG. 7 is a sectional view of a main part of another embodiment.

FIG. 8 is a schematic diagram of one embodiment of the present invention.

FIG. 9 is a diagram illustrating the operation of the present invention.

FIG. 10 is a diagram illustrating the operation of the present invention.

FIG. 11 is a load characteristic diagram of the pressure sensor of the present invention.

FIG. 12 is a control block diagram of the vacuum cleaner of the present invention.

FIG. 13 is a sectional view of a sensor showing another embodiment.

FIG. 14 is a sensor sectional view showing another embodiment.

FIG. 15 is a sectional view of a sensor showing another embodiment.

FIG. 16 is a schematic diagram showing another embodiment.

FIG. 17 is a sectional view of a main part showing another embodiment.

FIG. 18 is a sectional view of a main part showing another embodiment.

FIG. 19 is a schematic diagram showing another embodiment.

[Explanation of symbols]

1 ... Suction mouth, 2 ... Extension tube, 3 ... Hose, 4 ... Vacuum cleaner body,
5 lower case, 6 upper case, 7 dust collecting case, 8 circuit case, 9 power cord, 11 paper filter, 1
2 ... body suction port, 13 ... port packing, 14 ... filter holder, 15 ... drive circuit, 16 ... front anti-vibration rubber, 17 ...
Rear anti-vibration rubber, 18: motor support, 19: body pressure intake, 20: chamber, 21: dust filter, 2
2 ... filter support rib, 23 ... pressure sensor, 24 ...
Sensor tube mounting port, 25 ... Seal packing, 26 ... Inadvertent filter, 28 ... Sensor tube, 29 ... Inner wall surface in front of motor, 32 ... Sensor pressure introduction path,
33: Sensor internal space, 36: Dust blocking film, 37: Fine ventilation hole, 39: Electric blower, 40: Bellows, 42 ...
Pattern resistance substrate, 43 ... Slider, 44 ... Electrode, 4
5 conductive spring, 46 return spring, 47 sensor body,
48: seal cap, 49: pressure receiving port, 50: electric blower intake port, 51: dust collection chamber, 52: motor front space, 53 ...
Control board, 54: Atmospheric pressure inlet, 55: Labyrinth.

Continuing on the front page (72) Kazuhiro Kubota 1-1-1, Higashitaga-cho, Hitachi City, Ibaraki Prefecture Inside the Taga Headquarters, Electric Appliances Division, Hitachi, Ltd. No. 1 Hitachi Taga Technology Co., Ltd. (72) Inventor Hiroshi Odawara 1-1-1, Higashi Taga-cho, Hitachi City, Ibaraki Prefecture Hitachi, Ltd.Electrical Equipment Division, Taga Headquarters (56) References JP 4-84920 (JP, A) JP-A-1-236028 (JP, A) JP-A-58-146332 (JP, A) JP-A-7-59700 (JP, A) JP-A-58-146333 (JP, A) ( 58) Fields surveyed (Int.Cl. ⁷ , DB name) A47L 9/28

Claims (1)

(57) [Claims] 1. A cleaner body having an electric blower and a dust collecting filter for collecting dust sucked by a suction airflow of the electric blower, and a suction port connected to communicate with the dust collecting filter in the cleaner body. a vacuum cleaner having a body, has a pressure sensor for detecting the pressure of the electric vacuum cleaner, to form a space between the dust collecting filter and the electric blower of the air inlet, said space The pressure intake of the pressure sensor is located at a position where the pressure intake of the pressure sensor is substantially cylindrical.
A vacuum cleaner comprising: a chamber; and a dustproof filter disposed inside the chamber .