JP2004239536A - Air purification system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air purification system in which an inexpensive and easy-to-use formaldehyde detecting device is loaded. <P>SOLUTION: A gas detecting device 20 is composed of a detecting part 21 formed by attaching a detection paper 21b impregnated with a reagent, to a frame body 21a, and a casing having an air inlet 22a formed by opening its front face, and a ventilating hole 22b formed on its lower face corresponding to a discharge hole 13a of a second partition 13. The gas detecting device 20 comprises a detecting holder 22 longitudinally sliding in an upper compartment 15, a locking part 23 for locking the detecting holder 22 to a specific position in the upper compartment 15, a spring 24 for pressing the detecting holder 22 from a rear part toward a front part in the upper compartment 15, and a plate-shaped pressing plate 25 mounted between a back face of the detecting holder 22 and the spring 24, longitudinally slid, and opening the discharge hole 13a by moving the lower face closing the discharge hole 13a backward, when the detecting holder 22 is mounted on the predetermined position of the upper compartment 15. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a formaldehyde detector, and more particularly, to an air purifier having a detection structure for detecting indoor formaldehyde with a reagent.
[0002]
[Prior art]
Conventionally, an air purifier has an appearance shown in, for example, an external perspective view of FIG. 4A, and FIG. 4B shows a cross-sectional view thereof.
In this air purifier, a suction port 81 is provided on a front surface of a vertically elongated main body, and an outlet 82 having a wind direction changing plate is provided on an upper surface of the main body. A display unit 83 for displaying the state of dirt in the room is provided. As shown in the sectional view of FIG. 4B, the main body is provided with a plurality of filters 84 for adsorbing dust or odor contained in the sucked air on the back surface of the suction port 81, and the back surface is cleaned. A blower fan 85 driven by a fan motor 86 is provided for sending out the blown air from the outlet 82 into the room again.
By the way, besides dust and pollen, harmful gas emitted from furniture, floors, wallpaper, etc. exists in the room, and so-called sick houses have recently become a problem. Among them, formaldehyde is harmful to the human body, and one method for easily detecting this is as follows.
The porous detection paper is impregnated with hydroxylamine sulfate and methyl yellow which reacts with sulfuric acid, and air containing formaldehyde is passed through the detection paper. At this time, a chemical reaction occurs, and hydroxylamine sulfate is changed to sulfuric acid. This sulfuric acid reacts with the methyl yellow, and as a result, the concentration of formaldehyde is expressed as a reaction mark. Then, the light of a light emitting diode is applied to the reaction mark, and the reflected light is read by a photodiode to electrically detect the concentration (see Patent Document 1).
[0003]
However, such detection methods and devices are mainly used as inspection devices, and there has been a demand for general household deodorizers and air purifiers equipped with inexpensive and easy-to-handle formaldehyde detection devices.
[0004]
[Patent Document 1]
JP-A-7-229889 (page 2-3, FIG. 1)
[0005]
[Problems to be solved by the invention]
An object of the present invention is to solve the above-mentioned problems and to provide an air purifier equipped with a formaldehyde detector that is inexpensive and easy to handle.
[0006]
[Means for Solving the Problems]
In order to solve the above problems, the present invention provides a suction port on the front face of the main body, an outlet on the top face, and partitions the inside of the main body forward and backward by a partition plate having a suction hole, and the rear section. A blower fan is provided so as to face the suction hole, and the front section is vertically divided by a second partition plate having a discharge hole, and the lower section adsorbs dust or odor in the air flowing from the suction port. While installing a dust collection filter,
The upper section is provided with an air passage connecting the inlet provided in the front of the main body and the discharge hole provided in the second partition plate, and in the same air passage, a harmful gas in the air is detected by a color change due to a chemical reaction. A gas detection device is provided.
[0007]
Further, the gas detection device has a detection unit in which a detection paper impregnated with a reagent for detecting a harmful gas is adhered to a frame, and a front surface is opened to form the inlet, and the second partition plate is formed on a lower surface. A detection holder, which is formed of a box having ventilation holes corresponding to the discharge holes, and which slides back and forth in the upper section, and a lock for locking the detection holder at a predetermined position in the upper section. Part, a spring that presses the detection holder forward from the rear in the upper section, and is disposed between the back surface of the detection holder and the spring and slides back and forth, and the detection holder is When mounted on the upper section, the lower surface closing the discharge hole moves rearward to have a plate-shaped pressing plate that opens the discharge hole.
[0008]
Further, the detection holder has a structure in which insertion holes for inserting the detection unit are provided on upper and lower surfaces or side surfaces of the detection holder, and the detection unit is detachable from the detection holder.
[0009]
Further, the engaging portion corresponds to the engaging hole provided on the upper or lower surface or the side surface of the detection holder, and the engaging hole provided in the upper section, and is engaged with the engaging hole by energizing a solenoid. The locking pawl is released from the stop.
[0010]
Further, the detection section has a structure including a color sample corresponding to the reaction color of the detection paper and indicating the approximate gas concentration.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an air purifier according to the present invention will be described in detail with reference to the drawings.
FIG. 1A is an external perspective view showing an embodiment of an air purifier according to the present invention, and FIG. 1B is a sectional view thereof.
In this air purifier, a suction port 1 is provided on a front surface of a vertically long main body, and an air outlet 2 provided with a wind direction changing plate is provided on an upper surface of the main body. A display unit 3 for displaying the state of dirt in the room and the like is provided.
As shown in the cross-sectional view of FIG. 1B, the main body is divided into front and rear by a partition plate 10 having a suction hole 10a formed therein, and a blower fan 5 is formed in a rear section 11 so as to face the suction hole 10a. And a fan motor 6 for driving the same.
Further, the front section 12 is vertically divided by a second partition plate 13, and a dust collection filter 4 for adsorbing dust or odor contained in the sucked air is disposed on the back surface of the suction port 1 of the lower section 14. . Further, the upper section 15 is provided with a gas detection device (not shown) for detecting a harmful gas in the air by a color change due to a chemical reaction.
As shown by the arrow in FIG. 1B, the air in the room passes through the dust collection filter 4 from the suction port 1 and the purified air is sent out again from the air outlet 2 into the room.
[0012]
The gas detector for detecting formaldehyde, which is a feature of the present invention, is provided in the upper section 15 of the air purifier. FIG. 2 is a detailed cross-sectional view of a main part of the upper section 15.
The gas detection device 20 has a detection unit 21 in which a detection paper 21b impregnated with a reagent for detecting a harmful gas is adhered to a frame 21a, an air inlet 22a is formed by opening a front surface, and a second surface is formed on a lower surface. It consists of a box provided with a vent hole 22b corresponding to the discharge hole 13a of the two partition plate 13, and a detection holder 22 that slides back and forth in the upper section 15, and the detection holder 22 is positioned at a predetermined position in the upper section 15. Locking portion 23, a spring 24 for pressing the detection holder 22 forward from the rear in the upper section 15, and a spring 24 disposed between the back surface of the detection holder 22 and the spring 24. When the detection holder 22 is mounted at a predetermined position of the upper section 15, the lower surface that has closed the discharge hole 13 a moves rearward to release the discharge hole 13 a from the plate-shaped pressing plate 25. It is configured.
An optical sensor 26 is buried in a surface facing the lower surface of the pressing plate 25. When the detection holder 22 slides to a predetermined position, it is detected that the pressing plate 25 is located above the optical sensor 26. Is done.
[0013]
As shown in the perspective view of FIG. 3, the detection holder 22 has an insertion hole 22 c for inserting the detection unit 21 on the upper surface of the detection holder 22, so that the detection unit 21 can be attached to and detached from the detection holder 22. Has become. Therefore, a groove 22d into which the detection unit 21 is slid and inserted is provided on the inner surface of the detection holder 22 corresponding to the insertion hole 22c.
[0014]
The detection unit 21 has a structure in which a detection paper 21b impregnated with a reagent for detecting formaldehyde, which is a harmful gas, is adhered to a frame 21a.
The detection paper 21b is made by impregnating a porous paper with hydroxylamine sulfate and methyl yellow which reacts with sulfuric acid, and a chemical reaction occurs due to formaldehyde contained in the air passing through the detection paper 21b. Then, hydroxylamine sulfate is converted to sulfuric acid. This sulfuric acid reacts with methyl yellow, and the concentration of formaldehyde appears as a reaction mark.
In order to prevent this reaction from occurring in the storage unit 21 in the stored state, a film 21c for blocking air is attached to the front and back surfaces of the frame 21a. Therefore, immediately before the measurement is started, the film 21c is peeled off, and then the detection unit 21 is inserted into the insertion hole 22c of the detection holder 22 and mounted.
In addition, the detection unit 21 includes a printed color sample 21d indicating the formaldehyde gas concentration corresponding to the reaction color of the detection paper 21b on the front side of the detection unit 21. In this example, a color sample 21d on which four levels of gas concentrations of 0 to 0.025 ppm, 0.025 to 0.05 ppm, 0.05 to 0.075 ppm, and 0.075 to 0.1 ppm are printed, and By visually comparing the reaction color of the detection paper 21b with the color of the detection paper 21b, an approximate density can be obtained. It should be noted that the printed color sample 21d is displayed as 25, 50, 75, and 100 corresponding to the four levels of gas concentrations.
[0015]
As shown in FIG. 2, the locking portion 23 is fixed to an engagement hole 22 e provided on the lower surface of the detection holder 22, a locking claw 23 b corresponding to the engagement hole 22 e, and an upper surface of the second partition plate 13. It comprises a solenoid 23a, and a spring 23c disposed between the solenoid 23a and the locking claw 23b.
One end of the locking claw 23b is pivotally supported, and the other end is pivotally supported by the tip of the solenoid 23a. Therefore, when the solenoid 23a is in the non-energized state, the locking claw 23b is rotated upward by the pressing of the spring 23c and fitted into the engagement hole 22e, and is rotated downward when the solenoid 23a is in the energized state. The engagement with the mating hole 22e is released.
[0016]
Next, the operation of the above configuration will be described.
As shown in FIG. 3, first, the film 21 c of the detection unit 21 is peeled off, and the film 21 c is mounted on the detection holder 22. Then, as shown in FIG. 2, the detection holder 22 is inserted from the front of the upper section 15. When the detection holder 22 reaches a predetermined position, the pressing plate 25 located at the dotted line before the detection holder 22 is inserted is pushed by the back surface of the detection holder 22 and retreats to the position shown in the drawing. At the same time, the locking claw 23b of the locking portion 23 and the engagement hole 22e are locked, and the detection holder 22 is fixed inside the upper section 15.
[0017]
When the pressing plate 25 retreats, the control unit (not shown) detects that the pressing plate 25 is located above the optical sensor 26, and a predetermined time, for example, 5 minutes, at which the formaldehyde sufficiently reacts with the reagent of the detection paper 21b. During this time, the blower fan 5 is rotated. Since this time is inversely proportional to the capacity of the air to be detected, the control unit determines the rotation speed of the blower fan 5 in consideration.
When the detection holder 22 is fixed inside the upper section 15, the pressing plate 25 is retracted to the position shown in the drawing as described above. Accordingly, the air to be detected indicated by the arrow in FIG. 2 can flow from the inlet 22a of the detection holder 22 to the detection paper 21b of the detection unit 21, the ventilation hole 22b of the detection holder 22, and the discharge hole 13a of the second partition plate 13. . The detected air merges with the flow of the air to be cleaned indicated by the arrow, and is sent out again from the outlet 2 into the room.
[0018]
After a lapse of a predetermined time, the control unit turns on the solenoid 23a and releases the locking of the locking unit 23. Then, the pressing plate 25 pushes the back surface of the detection holder 22 forward, and pushes the detection holder 22 back to the position shown by the dotted line in FIG. Then, the pressing plate 25 is in a state of closing the discharge hole 13a of the second partition plate 13, and the flow of the air to be detected is cut off.
In this state, the insertion hole 22c on the upper surface of the detection holder 22 is exposed from the upper section 15. When the inspection is performed again, the detection unit 21 can be replaced without removing the detection holder 22.
With such a structure, the operation of pushing the detection holder and the switching of the gas detection air passage can be performed by one operation. In addition, when the engagement of the detection holder is released, the front surface of the detection holder projects by a predetermined size, so that the end of the inspection can be visually confirmed.
Further, the detection holder can be fixed to a predetermined position and released in a predetermined time determined by the control unit with a simple structure.
[0019]
The removed detection unit 21 can easily know the approximate gas concentration of formaldehyde by visually comparing the reaction color of the detection paper 21b after measurement with the color sample 21d.
With the above structure, it is possible to provide an air purifier equipped with a formaldehyde detector that is inexpensive and easy to handle.
[0020]
【The invention's effect】
As described above, according to the air purifier of the present invention, the invention according to claim 1 is directed to an air passage between an intake for sucking air from a front surface and an exhaust hole for discharging air to a lower compartment in an upper compartment. By providing a gas detector for detecting harmful gas in the air based on a change in color due to a chemical reaction, an air purifier equipped with a formaldehyde detector that is inexpensive and easy to handle can be provided.
[0021]
The invention according to claim 2 is a gas detection device, comprising: a detection unit in which a detection paper impregnated with a reagent for detecting a harmful gas is adhered to a frame; a front surface opened to form an intake; A detection holder, which is formed of a box body having ventilation holes corresponding to the discharge holes of the two partition plates, and slides back and forth in the upper compartment, and a member for locking the detection holder at a predetermined position in the upper compartment. A stop portion, a spring that presses the detection holder forward from the rear in the upper compartment, and a spring disposed between the rear surface of the detection holder and the spring and slid back and forth, and the detection holder is attached to the upper compartment. At the time, by having a structure consisting of a plate-shaped pressing plate that opens the discharge hole by moving the lower surface that closed the discharge hole backwards,
The operation of pushing the detection holder and the switching of the gas detection air passage can be performed by one operation. In addition, when the engagement of the detection holder is released, the front surface of the detection holder projects by a predetermined size, so that the end of the inspection can be visually confirmed.
[0022]
According to a third aspect of the present invention, the detection holder is provided with insertion holes for inserting the detection unit on the upper and lower surfaces or side surfaces of the detection holder, and the detection unit is detached from the detection holder by a structure in which the detection unit is detachable from the detection holder. The detector can be replaced without the need.
[0023]
According to a fourth aspect of the present invention, the engaging portion corresponds to an engaging hole provided on the upper or lower surface or a side surface of the detection holder and an engaging hole provided in the upper section, and the engaging portion is connected to the engaging hole by energizing the solenoid. By using the locking claw for releasing the locking, the detection holder can be fixed to a predetermined position and released in a predetermined time determined by the control unit with a simple structure.
[0024]
According to the fifth aspect of the present invention, by providing the detection unit with a color sample corresponding to the reaction color of the detection paper and indicating the approximate gas concentration, the gas concentration of formaldehyde can be easily known.
[0025]
[Brief description of the drawings]
FIG. 1A is an external perspective view showing an embodiment of an air purifier according to the present invention, and FIG. 1B is a sectional view thereof.
FIG. 2 is a sectional view of a main part showing an embodiment of the air purifier according to the present invention.
FIG. 3 is a perspective view showing a detection unit and a detection holder according to the present invention.
4A is an external perspective view showing a conventional air purifier, and FIG. 4B is a cross-sectional view thereof.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Inlet 2 Outlet 3 Display part 4 Dust collection filter 5 Blower fan 6 Fan motor 10 Partition plate 10a Suction hole 11 Rear section 12 Front section 13 Second partition 13a Exhaust hole 14 Lower section 15 Upper section 20 Gas detector Reference Signs List 21 Detecting portion 21a Frame 21b Detecting paper 21c Film 21d Color sample 22 Detection holder 22a Inlet 22b Vent hole 22c Insertion hole 22d Groove 22e Engagement hole 23 Locking portion 23a Solenoid 23b Locking claw 23c Spring 24 Spring 25 Press plate 26 Optical sensor

Claims (5)

A suction port is provided on the front surface of the main body, an air outlet is provided on the upper surface, the inside of the main body is divided into front and rear by a partition plate having a suction hole, and a blower fan is provided in the rear section so as to face the suction hole, The front section is vertically divided by a second partition plate having a discharge hole, and a dust collection filter for adsorbing dust or odor in the air flowing from the suction port is disposed in the lower section,
The upper section is provided with an air passage connecting the inlet provided in the front of the main body and the discharge hole provided in the second partition plate, and in the same air passage, a harmful gas in the air is detected by a color change due to a chemical reaction. An air purifier characterized by comprising a gas detector that performs the following. The gas detection device has a detection unit in which a detection paper impregnated with a reagent for detecting a harmful gas is adhered to a frame, and a front surface is opened to form the inlet, and a discharge surface of the second partition plate is formed on a lower surface. A detection holder, which is formed of a box having ventilation holes corresponding to the holes and slides back and forth in the upper section, and a locking portion for locking the detection holder at a predetermined position in the upper section. A spring that presses the detection holder forward from rear in the upper section, and is disposed between the back of the detection holder and the spring and slides back and forth, and the detection holder is moved in the upper section. 2. The air purifier according to claim 1, wherein the lower surface of the air purifier comprises a plate-like pressing plate which moves rearward to open the discharge hole when the air purifier is mounted on the air purifier. The said detection holder is provided with the insertion hole for inserting the said detection part in the upper and lower surfaces or the side surface of the said detection holder, The said detection part becomes detachable with respect to the said detection holder, The characterized by the above-mentioned. Air cleaner. The engagement portion is provided with an engagement hole provided on an upper or lower surface or a side surface of the detection holder, and is provided in the upper section and corresponds to the engagement hole, and the engagement with the engagement hole is performed by energizing a solenoid. The air purifier according to claim 1, comprising a locking claw to be released. The air purifier according to claim 1, wherein the detection unit includes a color sample corresponding to a reaction color of the detection paper and indicating the approximate gas concentration.

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