JPS60163629A - 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] Industrial Application Field The present invention relates to a vacuum cleaner that controls the input power of an electric blower by electrically detecting changes in an air volume sensor provided in an air flow path. be.

Conventional configuration and its problems Traditionally, changes in air volume within the air flow path of a vacuum cleaner are converted into movement of the wind receiving plate of the air volume sensor, and this movement is electrically detected, thereby controlling the input power of the electric blower. Vacuum cleaners that change are known. However, since the wind receiving plate of the air volume sensor is installed immediately before the electric blower, that is, in the intake flow path, the air flow is significantly obstructed, pressure loss increases, and the suction performance is significantly adversely affected. was there.

Further, since it is necessary to ensure the operating range of the wind catcher within the intake flow path, a large space is required inside the vacuum cleaner, resulting in problems such as the overall size of the vacuum cleaner.

In addition, as mentioned above, the air volume sensor is installed inside the intake flow path, but it is not possible to install it in a way that blocks the intake flow path because the performance drop due to pressure loss will be extreme. It was customary to set up

Therefore, the operational accuracy and quick response of the airflow sensor were poor.

OBJECTS OF THE INVENTION The present invention eliminates these conventional drawbacks, and provides an energy-saving vacuum cleaner that does not allow more input power than necessary to flow to the electric blower.

Structure of the Invention The vacuum cleaner of the present invention electrically detects changes in an air volume sensor provided in an air flow path to control the input power of an electric blower in a motor case disposed within the vacuum cleaner body. The motor case is provided with a plurality of exhaust holes, and one of the exhaust holes is provided with an air volume sensor that responds to the exhaust force, and an area other than the area of the exhaust hole that activates the air volume sensor is provided. By increasing the total area of the exhaust holes, it prevents performance degradation due to pressure loss and improves the responsiveness and operational accuracy of the airflow sensor.

Description of examples Examples thereof will be described below based on the accompanying drawings.

In FIGS. 1 to 6, 1 is a vacuum cleaner main body, and a dust box 2 is detachably attached to the front part of the vacuum cleaner main body. The dust box 2 has an air intake hole 3 in the center of its front surface, and a handle 4 integrally connected to its lower circumference. The dust box 2 is maintained in an attached state by engaging the rear lower end of the handle 4 with the lower peripheral portion of the vacuum cleaner main body 1 via a buckle mechanism 6. 6 is a filter device built into the dust box 2. Further, an upper inner frame plate 1a and a lower inner frame plate 1b are stretched inside the vacuum cleaner main body 1, and a cord reel mechanism 7 is arranged inside the main body on the lower surface side of the lower inner frame plate 1b. Upper inner frame board 1a
Control circuit, operation switch,
An electronic control unit 3o having a display function and the like is provided.

Reference numeral 8 denotes a motor case disposed inside between the upper and lower inner frame plates 1a and Ib of the main body 1, and an electric blower 9 is installed inside the motor case. The front end portions of the inner frame plates 1a and 1b are press-contacted and fixed to the inner circumferential surfaces of the inner frame plates 1a and 1b, and the rear end surfaces are held and fixed to the inner surface of the rear wall of the motor case 8 by the rear elastic body 11.

Next, the structure of the airflow sensor will be explained based on FIGS. 2 to 6. The motor case 8 has exhaust holes SA and SB formed at the rear of the lower periphery on both sides. The motor case 8 is sealed via the front elastic body 1o so that the exhaust from the motor case 9 is completely exhausted from these exhaust holes aa and ab. Further, an outwardly projecting mouth edge 8a' is integrally formed on the peripheral edge of one exhaust hole 8a, and a reinforcing rib 8b' is integrally provided on the peripheral edge of the other exhaust hole 8b. Furthermore, one exhaust hole 8
A horizontal lateral groove 31 having a concave arc-shaped cross section is recessed on one side of the motor case 8 in the upper part of a.

Reference numeral 12 denotes a sensor fixing frame integrally provided between the rear end and the side corners of the motor case 8, which is integrally connected to the upper and lower edges of the rear end of the lateral groove 31 as well as from the rear face to the side corners of the motor case 8. Consisting of upper and lower frame plate pieces 12', 12' in the shape of a dovetail, and front and rear frame plate pieces 12'', 12'' connected between both ends of the upper and lower frame pieces 12', 12', respectively, Upper and lower frame plate pieces 12' protruding toward the rear side of the motor case 8;
A U-shaped fitting groove 12a is provided extending from the center of the facing surface of the rear frame plate piece 12'' to the center of the inner surface of the rear frame plate piece 12''N, and an opening/pocket hole 12b is provided at the center of the top end surface of the rear frame plate piece 12'N. Also, the upper end corner of this rear frame plate piece 12'' is notched to an appropriate depth to form a lead wire arrangement structure 12d.
A semicircular notch 12c is cut in the center of the top of the ``.

Reference numeral 13 denotes a mounting boss protruding from the lower periphery of the rear end of one side of the motor cage 28, and the L-shaped spring hook 21 is fixed to the boss with a screw 22. Reference numeral 14 denotes a mounting plate whose three peripheral edges, excluding the arcuate edge on one side, are inserted into the U-shaped fitting grooves 12a of the sensor fixing frame 12, and has a circular mounting hole 14a in the center on the negative side. A ground tab 14b is provided at the center of the other side, and the rotary shaft 15a of the variable resistor 15 is inserted into this mounting hole 14a, and the washer and nut 16 are screwed onto the threaded portion of the variable resistor 15. The variable resistor 15 is fixed in the frame 12, and the rotating shaft 15a is
are made to protrude outside from the semicircular cutout 12c of the front frame plate piece 12'' of the frame portion 12, and the protrusion is aligned with the horizontal groove 31. 17 is the terminal 15b of the variable resistor 16 and the mounting plate 1.
The middle part of the lead wire connected to the earth tab 14bK of No. 4 is inserted into the lead wire installation groove 12d of the frame part 12, and the connector 18 integrally molded at the end thereof is connected to the electronic control part 30. The signal detected by the variable resistor 15 is sent to the electronic control section 30.

Reference numeral 19 denotes a wind receiving plate which is attached to the mouth edge 8a' of one of the exhaust holes 8a described above so as to be openable and closable, and the shaft cylinder part 19a fixed to the upper edge thereof is press-fitted and fitted into the rotating shaft 15a of the variable resistor 16. It is.

Reference numeral 20 denotes a lid cap that seals the L-shaped opening end of the sensor fixing frame 12, and a locking groove 20a provided at the center of the semicircular inner surface is connected to an arc-shaped one side of the mounting plate 14 as shown in FIG. A lock pawl 20b fitted to the end edge and protruding from the center of the inner edge of the rear surface is engaged with a lock hole 12b provided in the rear frame plate piece 12'' of the frame portion 12.

・23 is a tension spring, one end of which is fixed to the tip hook hole 21a of the spring hook 21, and the other end is fixed to the hook boss portion 19b protruding from the shaft cylindrical portion 19a of the wind receiving plate 19, so that the tension of this tension spring 23 is fixed. Under normal conditions due to gravity, the wind catch plate 19
The exhaust hole 8a is completely closed off by being brought into close pressure contact with the mouth edge 8a' of the exhaust hole 8a.

To briefly describe the assembly order of the sensor unit configured as described above, the rotary shaft 15a of the variable resistor 16 is inserted into the mounting hole 14a of the mounting plate 14, and the washer and nut 1 are inserted.
After fixing the variable resistor 15 to the mounting plate 14 using 6,
Connect the lead wire 17 to the terminal 16b of the variable resistor 15 and the mounting plate 1.
4 to the ground tabs 14b, respectively.

Next, the shaft cylindrical portion 19a of the wind receiving plate 19 is press-fitted onto the rotating shaft 16a of the variable resistor 15, so that the wind receiving plate 19 is directly connected to the variable resistor 15 and can freely rotate together with the rotating shaft 15a. Next, the unit consisting of the variable resistor 16 and the wind receiving plate 19 is fixed to the motor case 8. First, the mounting plate 14 is inserted into the U-shaped groove 12a of the frame 12, and then the lead wires are inserted. 17 is inserted into the lead wire arrangement groove 12d, and then the lid cap 20 is attached to the open end of the frame portion 12.

At this time, the lock groove 20 provided on the inner surface of the lid cap 20
The lock claw 20b fits into the lock hole 12, and the lid cap 2o is completely fixed.

Spring hook 21 attached to mounting boss 13 with screw 22
A tension spring 23 is stretched between the hook post 19b and the wind receiving plate 19.

In this way, all the sensor mechanisms are attached to the motor case 8, and constituted as a single unit as a motor case unit.

Next, the means for fixing the motor case 8 and the vacuum cleaner main body 1 will be explained. As mentioned above, the front part of the motor case 8 is held in close contact with the front elastic body 10, and the front surface and outer periphery of this front elastic body 1o are The rear surface of the motor case 8 is held in contact with the inner surface of the vacuum cleaner main body 1, and side elastic bodies 24 are attached to the holding bosses 8C integrally formed on both sides of the case 8 at the rear of the motor case 8. However, it is held by inserting and fixing the same-side elastic body 24 into receiving bosses 1C protruding from both inner surfaces of the vacuum cleaner main body 1.

Note that the inner lining 25 fitted on the rear outer peripheral surface of the electric blower 9
and the gasket 26 that is in close contact with the rear inner surface of the motor case 8.
The exhaust hole gasket 27 attached to the inner surface of the exhaust hole 40 formed at the rear of the vacuum cleaner main body 1 is a sound absorbing material for reducing noise.

To describe the operation of the embodiment configured as above, by driving the electric blower 9, the floor nozzle, the connecting pipe,
The air and dust sucked into the dust box 2 through the intake hole 3 through a hose etc. are separated by a filter device 5,
Clean air passes through the electric blower 9 to the motor case 8
Exhausted inward.

The exhaust gas filling the motor case 8 first passes through the wind receiving plate 19.
However, the exhaust is not completely exhausted through the exhaust hole 8b alone, and when attempting to exhaust through the exhaust hole 8a provided with the wind catch plate 19, the wind pressure acts on the wind catch plate 19, and the tension 9 The wind receiving plate 19 is pushed out in the direction of the arrow X shown in FIG. 3 with the shaft cylinder portion 19a as the center against the force of the spring 23.

In this situation, the object to be cleaned, for example, the floor 2.
When the air volume sucked by tatami mats, carpets, etc. changes, the air volume discharged from the electric blower 9 changes, and the air volume discharged from the motor case 8 also changes proportionately. That is, the rotation angle of the rotating shaft 15a of the variable resistor 15 changes proportionally, and this is detected by the variable resistor 15, and controlled by the electronic controller 3o based on the detected signal. The electric blower 9 is operated by the output.

The air thus discharged from the exhaust holes 8a and sb is discharged to the outside of the vacuum cleaner main body 1 through the exhaust hole 40.

Here, the area of the exhaust hole 8a formed in the motor case 8 is smaller than the area of the other exhaust holes 8b.

FIG. 7 shows another embodiment in which the exhaust holes are exhaust hole 8a and grid 3.
Although it is composed of a plurality of exhaust holes 8b divided into two, the area of the exhaust hole 8a is smaller than the total area of the other exhaust holes 8b.

The grid 32 and the like are formed to reinforce the exhaust hole when the area is large.

Effects of the Invention As described above, the present invention provides a control mechanism that electrically detects changes in the air volume sensor placed in the exhaust flow path and controls the input power of the electric blower placed inside the vacuum cleaner body. It is possible to provide an energy-saving vacuum cleaner having the following features.

However, since the sensor mechanism is placed inside the exhaust flow path, it can be configured more compactly and the vacuum cleaner body can be made smaller compared to conventional systems where the sensor mechanism is placed inside the suction flow path.
It also reduces pressure loss during suction and improves suction performance.

Furthermore, by installing an airflow sensor in the exhaust flow path,
The electric blower, cord reel mechanism, and electronic control unit are nearby, making wiring and assembly easier and easier. The area of the exhaust hole where the wind catcher plate is arranged is smaller than the area of the other exhaust holes, so there is little pressure loss due to the wind catcher plate, and there is very little deterioration in performance. Therefore, the electric blower's temperature rise is small, and even if the wind catch plate malfunctions and the exhaust hole is blocked, there is little performance deterioration, and there is no abnormality caused by the electric blower's heat generation, making it highly reliable as a vacuum cleaner. is extremely high.

In addition, the area of the exhaust hole on the side where the wind catcher is placed is smaller, which means that the velocity of the flow passing through the exhaust hole is faster, and the wind catcher moves faster and has a wider operating range, resulting in high responsiveness and operation. It can also improve accuracy.

Furthermore, the storage space for the air volume sensor can be reduced, the placement location can be easily set, and the vacuum cleaner main body can be made smaller.

[Brief explanation of the drawing]

The drawings show embodiments of the present invention; FIG. 1 is a cutaway sectional view of the main parts of a vacuum cleaner, FIG. 2 is a partial vertical sectional view of the air volume sensor structure, and FIG. - A sectional view, Figure 4 is an exploded perspective view of the air volume sensor structure, Figure 6 is an external view of the variable resistor fixed within the sensor fixing frame, Figure 6 is the frame and Cross-sectional view of the lid cap,
FIG. 7 is a sectional view of another embodiment. 1...Vacuum cleaner body, 8...Motor case, sa, sb exhaust hole, 9...Electric blower,
19... Wind receiving plate, 3o... Electronic control section. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 5
Figure 6 Figure 7

Claims (1)

[Claims] Equipped with a control mechanism that electrically detects changes in the airflow sensor installed in the air flow path and controls the input power of the electric blower inside the motor case installed inside the vacuum cleaner body.
A plurality of exhaust holes are provided in the motor case, one of which is
A vacuum cleaner in which an air volume sensor that responds to exhaust force is placed in one exhaust hole, and the total area of the other exhaust holes is set larger than the area of the exhaust hole that activates this air volume sensor.