JPS5910602Y2 - indicator device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an indicator device that detects and displays negative pressure to indicate clogging of a filter in a vacuum cleaner, for example.

As shown in FIG. 5, in the conventional indicator of this type, one end of a guide tube 21 is connected to a ventilation hole 20 opened between the filter of the vacuum cleaner body and the suction side of an electric blower, and the other end of this guide tube 21 is A valve hole 22 communicating with the atmosphere is opened in the guide tube 21, and a ventilation groove 23 is formed around the outer circumference of the guide tube 21.
4, a structure is adopted in which a valve body 25 energized in the direction of closing the valve hole 22 is inserted, but in this conventional structure, the filter becomes clogged, and the negative pressure on the suction side of the electric blower When the value increases, the valve body 25 is attracted, and when the valve hole 22 is slightly opened, air flows into the guide cylinder 21 and flows from the ventilation groove 23 on the outer circumferential surface of the valve body 25 toward the ventilation hole 20 side.
5 is vibrated, the operation of the valve body 25 tends to be uneven, it takes time to move the valve body 25 to a position where movement can be confirmed, and there is an error in the inner diameter of the guide cylinder 21 and the outer diameter of the valve body 25. This has the disadvantage that the operation of the valve body 25 lacks reliability and requires high dimensional accuracy.

The present invention was developed in view of the above points, and it ensures the operation of the valve body so that when the negative pressure exceeds a set value, the valve body is instantaneously activated, thereby preventing clogging of filters in vacuum cleaners, for example. The present invention provides an indicator device for displaying information.

The structure of the present invention includes a partition member in the form of a valve hole that communicates with the atmosphere side, a guide member located on the negative pressure side of the partition member, surrounding the valve hole and attached at one end side, and the guide member. A valve body is fitted in the guide member so as to be freely retractable and has an outer diameter substantially the same as the inner diameter of the guide member, and is biased by a spring in a direction to close the valve hole, and the guide member has a valve body. A ventilation portion is formed to communicate the valve hole with the negative pressure side along the direction of movement of the body, and the difference between atmospheric pressure and negative pressure is detected by the movement of the valve body.

Next, the structure of an embodiment of the present invention will be explained with reference to FIGS. 1 and 2.

1 is the vacuum cleaner body case, this vacuum cleaner body case 1
An opening 3 is formed in a portion communicating with the negative pressure side 2 between a filter (not shown) and the suction side of the electric blower, and a packing-like partition member 4 is hermetically fitted into this opening 3.

That is, an annular protruding edge 6 having a fitting groove 5 formed in the opening 3 is engaged with the circumferential surface of the partition member 4 to maintain the partition member 4 airtight.

Further, this partition member 4 is formed with a valve hole 9 that communicates the negative pressure side 2 with the atmosphere side 7.

Further, the valve hole 9 is provided on the inner surface 8 of the negative pressure side 2 of the partition member 4.
An annular mounting groove 10 is formed around the periphery.

Next, reference numeral 11 denotes a guide member, which has a cylindrical shape, and has a plurality of axial ventilation portions 12 formed at intervals in the circumferential direction along the moving direction of the valve body 13, which will be described later, on the circumferential surface. .

One end of the guide member 11 has an annular portion connected to the partition member 4.
The valve hole 9 is fitted into the mounting groove 10 of the valve hole 9 and surrounds the valve hole 9.

A valve body 13 having an outer diameter that is approximately the same as the inner diameter of the guide member 11 is fitted into the guide member 11 so as to be movable in the axial direction. It is energized to close the valve hole 9.

In addition, a viewing hole 15 is formed in the main body case 1 so as to face the position where the valve body 13 closes the valve hole 9, and the sight hole 15 has a viewing hole 15 for viewing the valve body when the valve hole 9 is closed. A plate-shaped display member 16 of red color or the like is provided corresponding to the position where the display member 13 is interposed.

Next, the operation of this embodiment will be explained.

When the negative pressure on the negative pressure side 2 exceeds a set value due to filter clogging, etc., the valve body 13 is attracted against the spring 14, opens the valve hole 9, and the negative pressure side 2 is communicated with the atmospheric side 7. Air flows into the negative pressure side 2 from the valve hole 9 through the ventilation portion 12 of the guide member 11, thereby preventing burnout of the electric blower.

Then, as the valve body 13 moves, the display member 16 that is shielded by the valve body 13 is viewed through the viewing hole 15, and clogging of the filter is confirmed.

Then, the valve body 13 moves against the spring 14 to open the valve body 9, and the valve body 13 moves to a position where the valve hole 9 and the ventilation section 12 communicate with each other, and the valve hole 9 communicates with the negative pressure side 2. Until this happens, the valve body 13 does not vibrate due to the flow of air because air does not flow around the circumference of the valve body like the valve body with the structure shown in Fig. 5, and the valve body 13 confirms movement. Instantly moved to a possible position.

Note that the present invention is not limited to a structure in which the movement of the valve body 13 is confirmed by the display member 16 peered through the viewing hole 15;
A structure in which the movement of the valve body 13 itself can be confirmed using a scale or the like may be used.

Note that FIG. 3 is a characteristic diagram of the structure of the above embodiment, and FIG. 4 is a characteristic diagram of the structure of the fifth embodiment.
The characteristic diagram of the structure of the conventional example shown in the figure shows that according to the present invention, the structure shown in the above embodiment has less power loss in the valve body. A valve body having an outer diameter that is approximately the same as the inner diameter of the guide member and which closes the valve hole with a spring is inserted into the connected guide member, and the valve body is inserted into the outer peripheral surface of the guide member along the moving direction of the valve body. Since we have created a vent that communicates the valve hole with the negative pressure side, when the negative pressure exceeds the set value, the valve body moves against the spring, opens the valve hole, and the valve body allows air to flow through the outer circumferential surface of the guide member. It has been experimentally confirmed that the valve body is not affected by wind pressure because the flow flows from the ventilation part to the negative pressure side, and that the valve body is actuated instantaneously. It is possible to quickly check the difference in negative pressure, and is particularly suitable for checking if the filter of a vacuum cleaner is clogged.

[Brief explanation of the drawing]

FIG. 1 is a vertical sectional front view of an indicator device showing an embodiment of the present invention, FIG. 2 is a cross-sectional plan view of the same, FIG. 3 is a characteristic diagram of the same, and FIG. 4 is a diagram of the conventional indicator device shown in FIG. The characteristic diagram, FIG. 5, is a sectional view of a conventional indicator. 2... Negative pressure side, 4... Partition member, 7... Atmospheric side,
9... Valve hole, 11... Guide member, 12... Ventilation part, 13... Valve body, 14... Spring.

Claims (1)

[Scope of utility model registration request] A partition member in the form of a valve hole communicating with the atmosphere side, a guide member located on the negative pressure side of the partition member and surrounding the valve hole and attached at one end, and a guide member that is fitted into the guide member so as to be able to move forward and backward. and a valve body which is pressed in a direction to close the valve hole by a spring, and the guide member is provided with a ventilation portion that communicates the valve hole with the negative pressure side along the moving direction of the valve body. Or,
An indicator device characterized in that the difference between atmospheric pressure and negative pressure is detected by movement of the valve body.