JP2569961Y2 - Filter with usage limit alarm - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filter with a use limit alarm for notifying a use limit due to clogging of a filter.

[0002]

2. Description of the Related Art There is no conventional air conditioner filter which directly detects the clogging and warns of a use limit.

[0003]

SUMMARY OF THE INVENTION The object of the present invention is to solve the above-mentioned conventional problems and to provide a filter with a use limit alarm which directly detects clogging and warns the use limit.

[0004]

SUMMARY OF THE INVENTION In order to achieve the above objects, the present invention provides a diaphragm which is provided in a ventilation hole of a filter medium, and a means for resisting suction of the diaphragm, which has a reduced spring coefficient when extended. An object of the present invention is to provide a filter with a use limit alarm, comprising a coefficient change spring and a display for displaying the extension of the coefficient change spring.

[0005]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a filter with a use limit alarm according to the present invention. FIG. 1 shows a filter of the present invention, which has a filter medium (2) to be attached to an air conditioner (1).

[0006] A vent (4) is provided at an appropriate position of the filter medium (2), and a diaphragm (15) is stretched in the vent (4). The diaphragm (15) is connected to a display (17) displayed from a window by a connecting means (16) such as a wire.

[0007] In the filter shown in the above embodiment, when the air conditioner (1) is driven, air flows through the filter medium (2).

When the filter medium (2) is not so clogged, the differential pressure across the filter medium (2) is small. Therefore, a large force does not act on the diaphragm (15) sucked by the differential pressure.

As a result, the connecting means (16) which has been subjected to the force resisting by the coefficient changing spring (19) has been greatly pulled. Here, the coefficient change spring (19) is a spring whose spring coefficient decreases when the spring is extended.

Next, when the filter medium (2) is severely clogged, the pressure difference before and after the filter medium (2) increases. As a result, the diaphragm (15) is sucked with a large differential pressure, and the connecting means (1) is drawn.
6) is greatly pulled.

As described above, when the spring of the coefficient changing spring (19) is expanded, its spring coefficient becomes smaller, so that the movement of the connecting means (16) becomes larger.

This state is apparent from FIG. 2, that is, the expansion of the coefficient change spring (19) suddenly increases, and the display (17) largely moves to the window to display.

The position to be displayed is set slightly before the position where clogging of the filter medium (2) is saturated.

In the illustrated embodiment, a time counter is also incorporated, although it is incidental. That is, the other diaphragm (5) is sucked when the air conditioner (1) is driven, and the switch (7) is always closed during driving.

As a result, the time counter (13) is operated to count the use time of the filter medium (2) and display it as appropriate.

[0016]

[Effects of the Invention] The embodiment of the filter with a use limit alarm according to the present invention is as described above, and the effects are listed below. (1) Since the filter according to the present invention employs a coefficient changing spring, if the filter medium is severely clogged, the elongation of the spring is suddenly increased, and the filter is reliably displayed. (2) Since the filter of the present invention directly detects filter clogging, in particular, it is possible to grasp an accurate usage limit.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram of a filter with a use limit alarm according to the present invention.

FIG. 2 is a diagram showing the relationship between the differential pressure of the filter of the present invention and the extension of the spring.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Air conditioner 2 Filter medium 4 Vent hole 5 Diaphragm 6 Connecting means 7 Switch 9 Spring 11 Battery 13 Time counter 15 Diaphragm 16 Connecting means 17 Display body 19 Coefficient change spring

Claims (1)

(57) [Scope of request for utility model registration] 1. A diaphragm stretched through a vent of a filter medium,
A coefficient changing spring provided as means for resisting suction of the diaphragm and having a reduced spring coefficient when expanded;
A filter with a use limit alarm, comprising: a display member for displaying the extension of the coefficient change spring.