JPH0975647A - Air conditioning filter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inexpensively produced air conditioning filter ensuring the min. wind quantity at a time of the clogging of the filter by a simple constitution. SOLUTION: This air conditioning filter 4 can permit a predetermined quantity of air on the upstream side thereof to pass at a time of the clogging of the filter 4 arranged in an air passage 2. A connection part 7 is provided in one end of the filter material 6 attached to the filter 4 attached to the filter 4 so as to be made displaceable. The connection means 8 capable of connecting and attaching the filter material 6 is provided in the connection part 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air-conditioning filter which ensures a minimum air volume when a filter is clogged with a simple structure and can be manufactured at low cost.

[0002]

2. Description of the Related Art For example, when a filter of an air conditioner for a vehicle is clogged, the amount of air passing through is reduced, the amount of air in the defrost mode is insufficient, and it becomes impossible to sufficiently remove the fogging of the windshield. Driving visibility is reduced. Further, the heat exchange of the evaporator is reduced, the evaporator is frozen, the vaporization of the refrigerant is reduced, and the compressor may be liquid-compressed or seized. Therefore, when the filter is clogged, it needs to be replaced promptly.

Generally, this type of filter replacement is performed at the time of regular inspection of the vehicle, but before this inspection, there is a concern that the above situation may occur, and it is necessary to take appropriate measures. Conventionally, in order to meet such a demand, for example, in Japanese Utility Model Laid-Open No. 5-82621, two types of filters, large and small, are arranged side by side in an air passage, and one of these small filters can be rotated in the air flow direction. This filter is normally urged in the upstream direction of the air through a spring, and when the filter is clogged, the filter is rotated by high wind pressure to open the air passage, and the minimum air flow from the part. On the other hand, there is disclosed a filter device for an air conditioner for an automobile, in which the rotational displacement of the filter is detected by a micro switch, and an alarm lamp is interlocked with this to notify the above situation.

However, this conventional filter device requires a dedicated filter for securing a minimum amount of air when it is clogged and biases it through a spring, so that the structure is complicated and the manufacturing cost is high. At the same time, since the filter is rotated against the elasticity of the spring, a large wind pressure is required, and the clogging progresses accordingly, which may cause the above situation.

[0005]

SUMMARY OF THE INVENTION The present invention solves such a problem and secures a minimum amount of airflow when a filter is clogged with a simple structure, which can be manufactured at low cost. Intended to provide a filter.

[0006]

Therefore, according to the invention of claim 1, when the filter installed in the air passage is clogged,
In an air-conditioning filter capable of passing a predetermined amount of air on the upstream side, a connecting portion is provided at one end of a filter medium attached to the filter so that the connecting portion can be displaced, and the filter medium can be connected to and removed from the connecting portion. By providing a connecting means, the minimum air volume when the filter is clogged is secured with a simple structure, and this can be manufactured at low cost. According to the invention of claim 2, the connecting means is constituted by a pressing fastener,
We are trying to improve the simplification of the structure and the low cost of production.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The following will describe the illustrated embodiment in which the present invention is applied to a filter for an air conditioning system for a vehicle. In FIGS. 1 to 4, reference numeral 1 is an air conditioning duct which communicates with a passenger compartment, and an air duct is provided at one end thereof. An intake port (not shown) is provided, and air can be sucked from the intake port via a blower (not shown) described later. An evaporator 3 is installed in the air passage 2 on the downstream side of the air intake, and the evaporator 3
A filter 4 is installed upstream of the filter 4, and a blower (not shown) is arranged upstream of the filter 4.

The filter 4 is constructed in the shape of a horizontally long rectangular box having the same shape as the heat exchange surface of the evaporator 3, and a filter frame 5 is framed around the filter frame 5, and a filter medium 6 made of, for example, non-woven fabric is attached to the frame 5. Has been. The filter medium 6 is constituted by connecting rectangular filter medium pieces 6a and 6b, which are arranged on the left and right sides of the filter 6 and formed into a corrugated shape as shown in the drawing, and the outer end portion thereof is bonded to the filter frame 5.

The inner ends of the filter medium pieces 6a, 6b are the filter 6
Is connected to the intermediate portion of the connecting portion 7, 7, and the pressing type fasteners 8 and 8 which are connecting means which can be repeatedly connected and disconnected and which can be detached with a constant force are attached to the opposing surfaces of the connecting portions 7 and 7. , Filter element pieces 6a, 6b through the fasteners 8, 8
Is detachably connected.

In this case, by adjusting the lengths of the connecting portions 7, 7, that is, the lengths of the filter medium pieces 6a, 6b along the folding curve,
The minimum air volume required when the filter 6 is clogged, for example, the minimum air volume required when operating the air conditioner in the defrost mode, and the minimum air volume required to prevent the evaporator 3 from freezing or to prevent the compressor from burning or compressing the liquid. Can be adjusted.

Further, the dust removal function inherent to the filter 4 can be improved by making the area of the pressing type fasteners 8 and 8 that obstruct the permeation of air as small as possible. Furthermore, by adjusting the area and connection strength of the pressing type fasteners 8 and 8, the timing of introducing the minimum air amount when the filter 4 is clogged can be adjusted.

In addition to the above, reference numeral 9 in FIG.
The opening formed in the connecting portions 7 and 7 by peeling
Reference numeral 10 denotes dust attached to the surface of the filter medium 6. Although the pressing type fastener 8 is used as the connecting means in this embodiment, a magnet sheet can also be used in addition to this, and the present invention is not limited to a vehicle air conditioner, but can be applied to a home appliance air conditioner. Applicable.

FIG. 5 and FIG. 6 show another embodiment of the present invention, and the same reference numerals are given to the components corresponding to the above-mentioned embodiments. Of these, in the second embodiment shown in FIG. 5, instead of configuring the filter medium 6 with the two filter medium pieces 6a and 6b, a single filter medium piece 6b is used to simplify the configuration of the filter medium 6. The pressure-type fastener 8 attached to one end of the filter medium piece 6b is detachably connected to the pressure-type fastener 8 attached to the inner surface of the filter frame 5, and the pressure-type fasteners 8 and 8 that do not allow air to pass through are connected to the end of the filter 4. It is placed in the section to increase the amount of air when removing dust.

A third embodiment shown in FIG. 5 relates to a clogging detecting means of the filter 4, in which a magnet 11 and a reed switch 12 which constitute a proximity switch are attached to the connecting portions 7 and 7 of the filter medium 6, Alarm 1 for switch 12
3 is connected, and when a constant displacement in the thickness direction of the connecting portions 7 and 7 is detected, the alarm device 13 is activated to notify the clogging of the filter 4. In this case, since the connecting portions 7 and 7 are made of the lightweight filter medium pieces 6a and 6b or the cloth material, the connecting portions 7 and 7 can be displaced by a small force as compared with the conventional mechanism of this type, and are displaced by a correspondingly lower wind pressure. Therefore, the situation can be detected before the clogging of the filter 4 progresses considerably, and the deterioration of the driving visibility of the vehicle and the failure of the air conditioning system due to the clogging of the filter 4 can be prevented.

In the case of manufacturing the air-conditioning filter thus constructed, in the first embodiment, the corrugated filter medium 6 is cut into a predetermined shape to prepare filter medium pieces 6a and 6b, and the pressing filter 8 is provided at one end thereof. , 8 after mounting the filter element piece 6a,
Attach 6b to the left and right of the filter frame 5. Then, the connecting portions 7, 7 of the filter medium pieces 6a, 6b are positioned at the central portion of the filter 4, and these are polymerized to dispose the pressing fasteners 8, 8 so as to face each other. As described above, according to the present invention, since it is sufficient to manufacture a single filter, the structure is simple, and the filter can be manufactured easily and inexpensively as compared with the conventional one that requires manufacturing of two kinds of large and small.

When mounting the filter 4 thus manufactured on a vehicle, it is sufficient to mount the filter 4 close to the upstream side of the evaporator 3 installed in the air passage 2 of the air conditioning duct 1, and the two filters are arranged side by side as in the conventional case. , And the complexity of the work of rotatably mounting one of them is eliminated.

The state of attachment is as shown in the figure. The pressure type fasteners 8 and 8 are always joined and the filter medium pieces 6a and 6b are connected by the connecting portions 7 and 7. When the air conditioner is operated under this condition and the blower (not shown) is driven,
Air is taken in from the air intake port, which moves in the air passage 2 and is guided to the filter 4. When passing through the filter medium pieces 6a and 6b, the dust 10 is removed and the air is moved to the evaporator 3 and cooled by the evaporator 3. And it is sent to the passenger compartment. This situation is as shown in FIG. In this case, since the pressing type fastener 8 does not have a dust removing function, the fastener 8
The dust removal function can be improved by reducing the area of the.

Through such use, the filter medium pieces 6a, 6b
If the dust 10 adheres to the filter and the mesh becomes narrower, the filter 4 will become clogged and the filter 4
The amount of air passing through the filter gradually decreases, while the filter 4
The air stays on the upstream side of, and the introduced air is pushed into this, and the pressure of the part rises.

The above-mentioned pressure acts on the filter medium pieces 6a, 6b to try to separate the press type fasteners 8, 8 connecting them, and the connecting force of the fasteners 8, 8 opposes this,
The connection of the filter medium pieces 6a and 6b is maintained. In this way, the dust 10 further adheres to the filter medium pieces 6a, 6b, the pressure of the air passage 2 on the upstream side thereof rises, and the pressure fasteners 8,
When the connecting force of 8 is exceeded, the fastener 8,
8 separates to open the connection parts 7, 7, and the air before filtration flows in through the opening part 9. This situation is as shown in FIG.

In this case, the flow rate of the inflowing air is proportional to the length of the connecting portions 7, 7 that define the opening area of the opening 9, that is, the length along the bending line of the filter medium pieces 6a, 6b. By adjusting the length of the portion 7, the required air volume when the filter 4 is clogged can be adjusted.

Further, since the connecting force of the pressing type fasteners 8 and 8 is proportional to the area thereof, by adjusting the area, it is possible to adjust the minimum air flow introduction timing when the filter 4 is clogged. That is, when the area of the fastener 8 is small, the clogging can be cleared at an early stage of the clogging, while when the area of the fastener 8 is large, the clogging can be cleared at a later stage of the clogging. .

In this way, the air flowing in from the filter 4 merges with a small amount of the filtered air, is guided to the evaporator 3, promotes heat exchange of the evaporator 3, and is sent to the vehicle interior. Therefore, when the air conditioner is operating in the deft loft mode, the minimum amount of air required to remove the fog on the windshield is ensured, a good visibility is obtained for the operation of the vehicle, and heat exchange of the evaporator 3 is promoted to cause freezing. Prevents compressor burn-in and liquid compression and prevents compressor failure.

After the air-conditioning operation is stopped, the blower is stopped and the pressure rise disappears. Therefore, the press type fasteners 8 and 8 are joined and the filter medium pieces 6a and 6b are connected by the connecting portions 7 and 7. The original state of FIG. 3 is restored.

[0024]

As described above, according to the first aspect of the present invention, a connecting portion is provided at one end of the filter medium attached to the filter so that the connecting portion can be displaced, and the filter medium can be connected to and removed from the connecting portion. Since such a connecting means is provided, it is possible to secure a minimum air volume with a simple structure when the filter is clogged, and to manufacture this at low cost. Claim 2
According to the invention of (1), since the connecting means is constituted by the pressing type fastener, the simplification of the structure and the manufacturing cost can be promoted.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is a front view showing an embodiment of the present invention.

FIG. 3 is a cross-sectional view taken along the line AA of FIG. 2, showing a situation at the time of the dust removing function.

FIG. 4 is a cross-sectional view taken along the line AA of FIG. 2, showing a state of securing an air volume at the time of clogging.

FIG. 5 is a cross-sectional view showing a second embodiment of the present invention, showing a situation during a dust removing function.

FIG. 6 is a cross-sectional view showing a main part of a third embodiment of the present invention.

[Explanation of symbols]

 2 air passage 4 filter 6 filter material 7 connection part 8 connection means

Claims (2)

[Claims] 1. In an air-conditioning filter which allows a predetermined amount of upstream air to pass when a filter installed in an air passage is clogged, a connecting portion is provided at one end of a filter medium attached to the filter, and the connecting portion is displaced. A filter for air-conditioning, which is made possible and is provided with connecting means capable of connecting and disconnecting a filter medium at the connecting portion. 2. The air-conditioning filter according to claim 1, wherein the connecting means is a pressing fastener.