An air filter screen

Abstract

This invention discloses an air filter, comprising a filter and a filter detection body, wherein the filter detection body is placed on the back of the filter. The filter detection body includes a frame and a detection wire, the detection wire being fixed to the frame and connected to an external circuit. The detection wire includes a heating wire and an insulating layer, the heating wire being covered by the insulating layer. This invention uses a filter detection body to detect whether the filter is dusty, which can meet the actual impact of different air quality conditions on the filter, allowing the filter to be replaced only after reaching its service life, thus providing better timeliness. In addition, the filter detection body is reusable, simple to manufacture, easy to use, and highly economical.

Description

Technical Field

[0001] This invention relates to an air filter. Background Technology

[0002] Currently, the mainstream methods for detecting filter fullness in air purifiers, fresh air systems, and air purification systems on the market are electronic timing / optical detection. Electronic timing only roughly calculates the filter fullness cycle and cannot actually reflect whether it is truly full. Optical methods require placing sensors in different areas of the filter to detect the fullness status, which is complex and costly. Summary of the Invention

[0003] In order to solve the above-mentioned technical problems, the purpose of this invention is to provide an air filter.

[0004] The present invention is achieved through the following technical solution: an air filter, comprising a filter and a filter detection body, wherein the filter detection body is placed on the back of the filter; the filter detection body comprises a frame and a detection line, the detection line is fixed to the frame and connected to an external circuit, the detection line comprises a heating wire and an insulating layer, and the heating wire is covered by the insulating layer.

[0005] In a preferred embodiment, the fold line of the detection line is placed inside the frame for fixation.

[0006] In a preferred embodiment, the detection line is folded into a grid shape within the frame.

[0007] In a preferred embodiment, the thickness of the filter detection body is 2-3 mm.

[0008] In a preferred embodiment, the detection line is a microcrystalline heating wire, and the microcrystalline heating wire uses microcrystalline glass as the insulating layer.

[0009] In a preferred embodiment, the heating wire is an iron-chromium-aluminum heating round wire.

[0010] In a preferred embodiment, the radius of the iron-chromium-aluminum heating wire is 0.06 to 0.1 mm.

[0011] In a preferred embodiment, the detection line is a single line, which is bent around the frame.

[0012] In a preferred embodiment, the number of detection lines is multiple, and the multiple detection lines are folded around the frame to form multiple detection loops.

[0013] In a preferred embodiment, the external circuit is a driving sampling circuit, which includes a constant current circuit, a sampling circuit, and an ADC circuit. The positive voltage output port and the negative voltage output port of the constant current circuit are respectively connected to the end of the detection line and the sampling circuit. The detection line and the sampling circuit are connected to the ADC circuit.

[0014] This invention uses a filter detection body to detect whether the filter is full of dust, which can meet the actual impact of different air quality conditions on the filter, so that the filter can be replaced only after it has reached the end of its service life, thus having better timeliness; in addition, the filter detection body is reusable, simple to form, easy to use, and also has high economic efficiency. Attached Figure Description

[0015] To more clearly illustrate the technical solution of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a structural diagram of the filter detection body of the present invention.

[0017] Figure 2 This is a circuit connection diagram of the present invention.

[0018] Figure 3 This is a structural diagram of one application embodiment of the present invention. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to represent selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] In the description of this invention, it should be understood that the terms "upper", "lower", "left", "right", "vertical", "top", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0021] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0022] Reference manual attached Figure 1 An air filter includes a filter screen and a filter detection body 1, which is placed on the back of the filter screen. The filter detection body 1 includes a frame 11 and a detection line 12, which includes an input port 121 and an output port 122, and can be connected to an external circuit for signal acquisition. Preferably, the size of the filter detection body 1 matches that of the filter screen, and the filter detection body can be made into a mesh structure according to the external dimensions of the filter screen, thereby enabling comprehensive detection of changes in the dust accumulation state of the filter screen. Preferably, the thickness of the filter detection body 1 can be controlled within 2-3 mm. The filter detection body of the present invention has a long service life, low cost, high reliability, almost no impact on the air duct, can be reused, and is highly economical.

[0023] The aforementioned detection line 12 includes a heating wire and an insulating layer. The insulating layer covers the heating wire, forming a core-shell structure. In one specific embodiment, the detection line 12 is a microcrystalline heating wire. The microcrystalline heating wire uses microcrystalline glass as the insulating layer, which can be coated to cover the heating wire. Thus, by covering the heating wire with an insulating layer, the characteristic that the higher the temperature of the heating wire, the greater its resistance, is used as a means of detecting whether the filter is dusty. The microcrystalline glass layer serves to insulate, reduce sublimation of the heating wire, and prevent surface oxidation. The filter detection body continuously heats up when powered on, and then dissipates heat through the air flowing through the air purifier, fresh air system, and air purification system. The resistance of the detection line changes significantly when the temperature rises or falls. Since the airflow through a clean filter and a dusty filter is different, the magnitude of the resistance change is used to determine whether the filter is dusty, thereby detecting the actual usage status of the filter.

[0024] Preferably, the heating wire in the microcrystalline heating wire is an iron-chromium-aluminum heating round wire; more preferably, the iron-chromium-aluminum heating round wire is an iron-chromium-aluminum heating round wire with a radius of 0.06 to 0.1 mm.

[0025] Furthermore, the input port 121 and output port 122 of the aforementioned detection line are connected to an external circuit to form a driving sampling circuit for signal acquisition; see attached... Figure 2 The driving sampling circuit includes a constant current circuit, a sampling circuit, and an ADC circuit. The positive and negative voltage output ports of the constant current circuit are respectively connected to the detection line 12 (e.g., the microcrystalline heating wire in the attached diagram) and one end of the sampling circuit. The detection line 12 and the sampling circuit are connected to the ADC circuit together, transmitting the collected signal to the ADC circuit for analog-to-digital conversion. Then, the main controller determines whether the filter is full of dust. The driving sampling circuit of this invention is simple, requiring only a low-voltage, low-current power supply, and has little impact on overall power consumption.

[0026] In one embodiment, a single detection line 12 can be folded within the frame 11 to form a grid. The folding lines 123 of the detection line 12 can be placed inside the frame 11 for fixation. For example, a groove or snap-fit ​​part can be provided inside the frame 11 for fixing the folding lines 123. Of course, in other embodiments, the detection line 12 can also be designed into different shapes according to different application needs, and is not limited to the grid pattern shown in this invention.

[0027] In another embodiment, multiple detection lines can be wound into multiple detection loops. These multiple detection loops can be connected to a multi-channel ADC circuit to achieve detection. In this way, by setting multiple detection loops to correspond to different areas of the filter screen, the dust fullness of multiple areas of the filter screen can be detected separately, thereby detecting the actual dust fullness of the filter screen.

[0028] In one application embodiment, refer to the appendix Figure 3 The aforementioned filter includes a pre-filter 21 and a high-efficiency filter 22, which are stacked sequentially along with a filter detection body 1. The filter detection body 1 can be designed to match the size of the high-efficiency filter 22, meaning it can have the same area as the high-efficiency filter. Located behind the high-efficiency filter 22, the filter detection body 1 can detect whether the high-efficiency filter is full of dust. This invention uses a filter detection body to detect whether the filter is full of dust, which can meet the actual impact of different air quality conditions on the filter, allowing the filter to be replaced only after reaching its service life, thus providing better timeliness. Furthermore, the filter detection body is reusable, simple to manufacture, easy to use, and highly economical.

[0029] The foregoing description illustrates and describes preferred embodiments of the present invention. As previously stated, it should be understood that the present invention is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the inventive concept described herein through the foregoing teachings or techniques or knowledge in related fields. Any modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention should be within the protection scope of the appended claims.

Claims

1. An air filter, characterized in that, The system includes a filter screen and a filter screen detection body, with the detection body placed on the back of the filter screen. The detection body includes a frame and a detection line, which is fixed to the frame and connected to an external circuit. The detection line includes a heating wire and an insulating layer, with the heating wire covered by the insulating layer. When powered on, the filter screen detection body continuously generates heat, which is dissipated through the air flowing through the air purifier / fresh air system. The resistance of the detection line changes significantly with temperature fluctuations. Since the airflow through a clean filter screen differs from that through a dusty filter screen, the magnitude of the resistance change is used to determine if the filter screen is dusty, thus detecting the actual usage status of the filter screen. The external circuit is a driving sampling circuit, which includes a constant current circuit, a sampling circuit, and an ADC circuit. The positive and negative voltage output ports of the constant current circuit are respectively connected to the detection line and the sampling circuit. The detection line and the sampling circuit are connected to the ADC circuit.

2. An air filter according to claim 1, characterized in that, The fold line of the detection line is placed inside the frame for fixation.

3. An air filter according to claim 1, characterized in that, The detection line is folded into a grid shape within the frame.

4. An air filter according to claim 1, characterized in that, The thickness of the filter detection body is 2~3mm.

5. An air filter according to claim 1, characterized in that, The detection line is a microcrystalline heating wire, and the microcrystalline heating wire uses microcrystalline glass as the insulating layer.

6. An air filter according to claim 1, characterized in that, The heating wire is an iron-chromium-aluminum round heating wire.

7. An air filter according to claim 6, characterized in that, The radius of the iron-chromium-aluminum electric heating wire is 0.06~0.1mm.

8. An air filter according to claim 1, characterized in that, The detection line is a single line, and the single detection line is bent around the frame.

9. An air filter according to claim 1, characterized in that, The number of detection lines is multiple, and the multiple detection lines are folded around the frame to form multiple detection loops.

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