JPS61100216A - Dust indicator of 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 Field of the Invention The present invention relates to a dust indicator for indicating the degree of dust accumulation in a vacuum cleaner.

Conventional configuration and its problems When a large amount of dust accumulates in a vacuum cleaner, the filter becomes clogged with the fine dust, and if the vacuum cleaner continues to operate, the electric blower heats up, causing the body to deform.

To prevent this, a dust indicator that shows the amount of dust and a protector (safety valve) that allows cooling air to flow through the motor are required. There is also a configuration shown in FIG. 1 that serves both as an indicator and a protector. This is because when the filter starts to get clogged, pointer 1 starts to move, and when pointer 1 starts to move, air starts to leak and acts as a protector, but if the air leaks and the performance continues to deteriorate. Indicators must also work at the same time, as their use is generally undesirable. For this reason, when pointer 1 starts moving, pointer 1 is set so that it moves quickly.
This was determined by adjusting the inner diameter and taper of the pipe 2. Next, a description will be given of how a change in the dimensions of the corner 3 of the conventional pointer 1 affects the movement of the pointer. At this time, if the dimension of the corner 3 is changed from RO to RO,5 while keeping the inner diameter and taper of the pipe 2 constant, the pointer 1 is completely opened (x = O)
state to incompletely open state. In other words, there was a drawback that it did not function adequately as a dust indicator. Furthermore, since the air flow inside the pipe 2 flows through the narrow gap between the pointer 1 and the inner wall of the pipe 2, the inner wall of the pipe 2 and the display section 4 of the pointer 1 are dirty due to dirt, etc., making it difficult to see the pointer 1. was.

purpose of invention The present invention aims to overcome the above-mentioned conventional drawbacks.

Structure of the Invention The present invention provides a pointer ventilation hole inside the pointer.
This allows the air flow that previously flows between the pointer and the inner wall of the pipe to pass through the pointer, thereby reducing the influence of the conventional pipe inner diameter and taper and the corner of the pointer on pointer operation, The aim was to maintain and improve the performance of the dust indicator simply by controlling the dimensions of the unit.

Description of examples One embodiment will be described below with reference to the accompanying drawings.

5 is an electric blower using back pressure, 6a and 6b are filters for fine dust and coarse dust, respectively, and 7 is a dust box equipped with the filters 6a and 6b. Reference numeral 8 denotes a pode which detachably connects the dust box 7 and has an electric blower 5 and a cord reel (not shown) built in; 9 communicates one end between the filters 6a and eb and the electric blower 5;
A dust indicator has the other end communicated with the outside air, and 10 is an indicator window through which movement of the pointer 11 of the indicator 9 can be seen.

Next, in FIGS. 6-6, 12 is a transparent indicator pipe, and one end on the atmosphere side has an intake part 13. The intake section 13 has a circular pipe ventilation hole 14. The indicator pipe 12 has a plurality of ribs 16 on the inner wall 15 of the pipe in the direction of the pipe. The pointer 11 has a cylindrical shape with a bottom, and the outer diameter of the cylindrical portion 17 of the bottomed cylinder can slide between the ribs 16, and the bottom surface 18 of the bottomed cylinder has a pipe ventilation hole. 1
It has a larger diameter than 4. Reference numeral 19 denotes a spring that biases the pointer 11 toward the atmosphere, and at this time, the pipe ventilation hole 14 is sealed by the bottom portion 18. 2o is a pipe support that supports the other end of the indicator pipe 12. A pointer ventilation hole 2 communicating with the inside of the pointer 21 is provided on the outer periphery of the bottom surface portion 18.
2, this guideline vents.

The hole 22 connects to the atmosphere side and the electric blower and filter 6a.

It is configured to be able to fit into the inner diameter portion 24 and prevent the spring 19 from entering between the cylindrical portion 1 and the pipe rib 16.

1 Next, its operation will be explained.

When the filters 6a, eb start to become clogged, the negative pressure between the filters 6a, 6b and the electric blower 5 starts to increase, and as the filters 6a, eb become more clogged, the pointer 11 moves faster in the direction of arrow C. move. At this time, the sealed state of the pipe ventilation hole 14 by the bottom part 18 is released, and the atmosphere flows through the main air flow path composed of the pipe ventilation hole 14, the pointer ventilation hole 22, the inside of the pointer 2, the inside of the pipe 25, and the pipe support 2o. It flows to the electric blower 5 and acts as a protector for the future.

In addition, since the pointer ventilation hole 22 and the pointer interior 21 form a part of the main air flow path, the dimensions and taper of the pipe inner wall 15 are kept constant, and the corner 260 dimension of the pointer 11 is changed from RO to RO06. However, as shown in FIG. 3, it can be seen that the amount by which the pointer 11 changes from the fully open (x=O) state to the incompletely open state has become smaller than in the past. For this reason, in the past, both the pointer and the inner diameter and taper of the pipe were adjusted, but now the influence of the inner diameter and taper of the pipe has been reduced, and the performance of the dust indicator can be improved by simply controlling the dimensions of the pointer alone. Maintain and improve
Furthermore, the display part 27 of the pointer 11 and the pipe inner wall 15 are not soiled, and the indicator performance is improved.

Next, a second embodiment will be explained.

In FIGS. 7 and 8, 30 is a transparent indicator pipe, and one end on the atmosphere side has an intake part 31. The intake section 31 has a circular pipe ventilation hole 32 . 3
3 is a pointer having a substantially double cylindrical shape, and the outer cylinder 34 of this substantially double cylinder has a plurality of ribs 36 on the outer periphery in the direction of the cylinder axis,
The inner cylinder 36 has a substantially circular bottom portion 37 facing the atmosphere f11.

The inner diameter of the indicator pipe 30 is larger than the rib 35.
The pointer 33 can be slid inside the indicator pipe 3o by means of the rib 35. The bottom surface portion 37\i is configured to be smaller than the inner diameter of the pipe ventilation hole 32.

Reference numeral 38 denotes a spring that biases the pointer 33 toward the atmosphere, and at this time, the pipe ventilation hole 32 is sealed by the bottom portion 37.

39 is a pipe support that supports the other end of the indicator pipe 30. A pointer vent 4o is provided between the outer cylinder 34 and the inner cylinder 36, and the pointer vent 40 communicates between the atmosphere side and the electric blower 5 and the filters 6a and eb to form a main air flow path. ing. Said inner cylinder 36
has a plurality of ribs 41 on the outer periphery, and the ribs 41 integrate the inner cylinder 36 and the outer cylinder 34 to form the pointer 33. The rib 41 can fit into the inner diameter portion 42 of the spring 38, and is configured to prevent the spring 38 from entering between the rib 35 and the pipe inner wall 43 of the indicator pipe 30.

Hereinafter, the operation of the pointer 33 is similar to that of the pointer 11 of the first embodiment, and the influence of the corner 44 of the pointer 33 on the pointer opening operation is the same as that of the corner 26 of the pointer 11. In addition, in the second implementation measurement, since there is no sliding rib for the pointer 33 on the pipe inner wall 43 of the indicator pipe 30, the sliding rib can be positioned in the indicator window 45 without positioning the indicator pipe 30. The disadvantage that the pointer 33 becomes difficult to see is eliminated.

"0 effect"
] In this way, according to the present invention, even if the pointer and pipe diameter are adjusted as in the past, the influence of the taper of the pipe is small, and the adjustment can be made by only the pointer, making the adjustment easy and having practical value. It's a big one.

Furthermore, since the inside of the pointer is formed as the main air flow path,
Compared to conventional pointers in which the outer periphery of the pointer is formed as the main air flow path, the inner surface of the indicator pipe is less likely to be damaged by measurements included in the main air flow, and the pointer can be seen much better than the indicator window. Indicator performance is improved.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a conventional dust indicator, Fig. 2 is a sectional view taken along line A-A in Fig. 1, and Fig. 3a is a sectional view for comparing and explaining the indicator performance of the conventional and present invention indicators. 4 is a vertical cross-sectional view of a vacuum cleaner according to an embodiment of the present invention, and FIG. 5 is a vertical sectional view of a vacuum cleaner according to an embodiment of the present invention.
FIG. 6 is a B-Bllfi plane view in FIG. 5, FIG. 7 is a cross-sectional view of a dust indicator showing a second embodiment of the present invention,
FIG. 8 is a D-Dllfi plane view in FIG. 7. 5...Electric blower, 6a, eb...
Filter, 9...Dust indicator, 3
3...Pointer, 12゜30...Indicator pipe, 14.32...Pipe ventilation hole, 15.4
3... Pipe inner wall, 16° 36... Rib, 19, 38 River... Spring, 22.40...
Pointer vent. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 3 (αs - 11 Figure 5 z3 tb Figure 7

Claims (3)

[Claims] (1) A transparent indicator pipe with one end communicating with the atmosphere and the other end with the space between the electric blower and filter, and having a pipe ventilation hole at the end on the atmosphere side, and an indicator pipe that slides inside the indicator pipe and is connected to the inside. A vacuum cleaner comprising a pointer having a pointer vent and a spring biasing the pointer toward the atmosphere, and closing the pointer vent when the pointer is in contact with the pipe vent. dust indicator. (2) The dust indicator for a vacuum cleaner according to claim 1, wherein the pointer has a plurality of sliding ribs on the outer periphery. (3) The dust indicator for a vacuum cleaner according to claim 1, wherein the indicator pipe has a plurality of pointer sliding ribs on its inner wall surface.