JPH0318690A - electric blower - 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 Field of Industrial Application The present invention relates to an electric blower used in a vacuum cleaner or the like.

2. Description of the Related Art A conventional electric blower of this type has a structure as shown in FIGS. 3 and 4, for example. That is, the rear shroud 1 has an inflator 3 in which a plurality of blades 2 are arranged, and a casing 4 that has an intake port 5 in the center and covers the impeller 3, and an air guide 6 on the opposite side of the casing 4 from the intake port 5. are installed in such a way that there is no air leakage. 7 is a commutator motor for driving the invera 3, and 8 is its exhaust port. Reference numeral 9 denotes a vacuum cleaner incorporating the above-mentioned electric blower 10, and a dust collection chamber 11 is equipped with a primary filter 12 and a secondary filter 13. The electric blower 10 is held on the vacuum cleaner 9 via a partition plate 14 and elastic members 15 and 16. Further, a suction space 17 is formed between the casing 4 of the electric blower 10 and the partition plate 14,
A pressure sensor, etc. that detects the pressure in this suction space 17 (
(not shown) is built into the vacuum cleaner 9. Further, a suction tool, an extension pipe, a hose, etc. (not shown) are connected to the vacuum drawing machine 9.

Problems to be Solved by the Invention In the vacuum cleaner 9 using the electric blower 10 described above,
When the commutator motor 7 starts driving, the impeller 3 starts rotating at high speed, and airflow starts to flow from the intake port 5 of the casing 4. That is, the vacuum cleaner 9 includes a suction tool, an extension pipe,
It functions to suction dirt and the like through a hose and collect it in the dust collection chamber 11. And the garbage etc. is in the dust collection room 1.
It comes to be collected by the primary filter 12 and secondary filter 13 in the filter 1. Here, the amount of air sucked in and the pressure constantly change depending on the amount of dirt and the like sucked in and the surface to be cleaned. For comfortable cleaning, a pressure sensor provided in the suction space 17 detects increases and decreases in pressure, controls the commutator motor 7, and controls the suction force. However, with such a pressure detection method, the airflow in the suction space 17 is disturbed, and the pressure fluctuates irregularly due to the large volume, making it impossible to accurately detect the pressure. That is, the suction force during cleaning becomes insufficiently controlled, leading to discomfort even though it is well controlled.

In order to solve the above problems, the present invention provides an electric blower that can accurately detect changes in pressure.

Means for Solving the Problems In order to achieve the above objects, the present invention has an impeller in which a plurality of blades are arranged in a rear shroud, a casing with an air intake opening in the center and covering the impeller, and A through hole is formed that communicates with the gap formed between the blade and the casing, and a pressure sensor is connected to the through hole.

Function: In the electric blower according to the present invention, a through hole is formed in the inner wall of the casing facing the blade, and a pressure sensor is connected to the through hole.
Since the pressure change in the gap between the blade and the inner wall of the casing can be detected with high accuracy, the control accuracy of the commutator motor based on the pressure is improved, and comfortable cleaning can be provided.

EXAMPLE Hereinafter, an example of the present invention will be described based on the accompanying drawings.

FIG. 1 and FIG. 2 show an embodiment of the rear shroud 2.
It has an invera 23 in which a plurality of blades 22 are arranged at one end, and a casing 24 that has an intake port 25 in the center and covers the invera 23, and there is no air leakage between the inlet port 25 of the casing 24 and the air guide 26 on the opposite side. It is installed like this. 27 is a commutator motor for driving the impeller 23, and 28 is its exhaust port. Two gaps are formed between the blade 22 and the casing 24, and a through hole 30 communicating with these two gaps is formed in the casing 24. Further, a connecting pipe 31 is connected to the casing 24 so as to connect the through hole 30 and the pressure sensor 20.

32 is a vacuum cleaner with a built-in electric blower 33 composed of the above-mentioned parts, and a primary filter 35 in the dust collection chamber 34.
and a secondary filter 36. Electric blower 3
3 is held on the vacuum cleaner 32 via a partition plate 37 and elastic members 38 and 39. Further, a suction space 40 is formed between the casing 24 of the electric blower 33 and the partition plate 37. In addition, the vacuum cleaner 32 includes a suction tool, an extension pipe,
A hose etc. (not shown) is connected.

In the above configuration, when the commutator motor 27 starts driving, the impeller 23 starts rotating at high speed, and airflow starts to flow from the intake port 25 of the casing 24. That is, the vacuum cleaner 32 functions to suck up dust and the like through a suction tool, an extension pipe, a hose, etc., and collect it in the dust collection chamber 34. Dust etc. are removed through the primary filter 35 in the fill chamber 34.
and collected by the secondary filter 36. Here, the amount of air sucked in and the pressure constantly change depending on the amount of dirt and the like sucked in and the surface to be cleaned. This results in a change in the pressure within the suction space 40, but also in the pressure in the gap 29 between the blade 22 and the casing 24. Since the gap 29 has a smaller volume than the suction space 40, slight pressure changes can be detected easily and quickly. That is, pressure is detected by a pressure sensor 20 connected to this gap 29 via a connecting pipe 31, and based on the detection result, the commutator motor 27
Since the suction force can be controlled, it is possible to provide comfortable cleaning with high precision.

Note that if the elastic material 38 of this embodiment is provided and supported in the vicinity of the intake port 25 of the recasing 24 from the through hole 30, the connection of the connecting pipe 3] will be facilitated, resulting in cost reduction, productivity improvement, etc. This will also bring about the effects of

Effects of the Invention As described above, the present invention detects the pressure change in the gap between the blade and the inner wall of the casing, thereby detecting minute pressure changes due to the amount of dirt sucked in and the surface to be cleaned with high accuracy and speed. This makes it easier to control the commutator motor based on pressure changes, making it possible to provide a vacuum cleaner or the like that can perform more comfortable cleaning.

[Brief explanation of the drawing]

Fig. 1 is a half-cut sectional view of an electric blower showing an embodiment of the present invention, Fig. 2 is a partial side sectional view of the same vacuum cleaner, Fig. 3 is a half-cut sectional view of a conventional electric blower, and Fig. 4. is a partial side sectional view of the same vacuum cleaner. 20...Pressure sensor 21...Rear shroud, 22...Blade, 23...
・Invera, 24...Casing, 29...
...Gap, 30...Through hole, 31...
・Connection pipe.

Claims (1)

[Claims] An impeller with multiple blades arranged in the rear shroud,
An electric blower has a casing that has an intake hole in the center and covers an impeller, has a through hole in the casing that communicates with the gap formed between the blades and the casing, and has a pressure sensor connected to the through hole.