Abstract:
The invention relates to an air cleaner, and more particularly to an air cleaner which includes a regenerative deodorizing filter to purify and treat gaseous substances contained in air, thus enabling efficient regeneration of the regenerative deodorizing filter, and a method of regenerating the filter of the air cleaner.

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to an air cleaner, and, more particularly, to an air cleaner which is provided with a regenerative deodorizing filter to efficiently treat offensive odors, volatile organic compounds, detrimental constituents and the like, and a method of regenerating the regenerative deodorizing filter of the air cleaner. 
     2. Description of the Related Art 
     Generally, an air cleaner is extensively used in homes, public facilities and industrial facilities, as means for treating particulate substances, bacteria, offensive odors, volatile organic compounds, detrimental constituents and the like and thus provide pleasant clean air. 
     The air cleaner is typically comprised of a plurality of filters for treating particulate substances such as dust and bacteria, and a deodorizing filter for treating gaseous substances such as offensive odors, volatile organic compounds, detrimental constituents and the like. 
     In the field of the filter, which is designed to treat particulate substances, a filter which is adapted to employ the sieving effect for particulate substances, and an electrostatic precipitation filter which is adapted to employ static electricity, are predominantly used. Meanwhile, in the field of the deodorizing filter, which is designed to treat gaseous substances, a fixed-bed adsorption filter which is adapted to use activated carbon and zeolite, an ozone oxidation filter which is adapted to use ozone, and a photocatalytic filter which is adapted to use photocatalyst, are predominantly used. 
     Among these, in the fixed-bed adsorption filter adapted to use activated carbon and zeolite, there are unfavorable drawbacks in that an amount of equilibrium adsorption at a low concentration is decreased, constituents adsorbed on the filter are desorbed depending on the exterior environment including an external temperature and a concentration because the constituents are adsorbed on the filter due to the physical bonding, and it does not have regenerative capacity by itself thus causing the shortened service life. 
     In the ozone oxidation filter, which is a system adapted to employ the oxidizability of ozone, although the filter can be used over a prolonged period of time without the replacement, it has drawbacks in that since it uses ozone, which is environmental pollutant, the ozone, which has not been yet reacted and then discharged to the atmosphere, may cause asthma, allergy and the like. 
     Further, in the air cleaner which use a photocatalytic filter, as disclosed in Korean Unexamined Patent Publication No. 10-2005-66353, there are unfavorable drawbacks in that the reaction rate at which the photocatalyst reacts detrimental constituents is decreased, it is difficult to conduct the uniform ultraviolet irradiation, and there is generation of accessory detrimental constituents such as ozone during the reaction process. 
     SUMMARY OF THE INVENTION 
     Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and an object of the present invention is to provide an air cleaner equipped with a generative deodorizing filter and a method of regenerating the regenerative deodorizing filter of the air cleaner, which is designed into a system adapted to regenerate a deodorizing filter suitable for the treatment of various offensive odors, volatile organic compounds and detrimental constituents, thus offering the desirable constant deodorizing efficiency over the prolonged period of time and thus more efficient air cleaning. 
     In order to accomplish the above object, the present invention provides an air cleaner including: at least one filter to purify and treat particulate substances contained in air introduced therein; a regenerative deodorizing filter to adsorb gaseous substances such as offensive odors, volatile organic compounds and detrimental gas contained in the air introduced therein for purification and treatment; and desorption means to desorb and treat the gaseous substances adsorbed on the regenerative deodorizing filter so that the regenerative deodorizing filter is continuously regenerated. 
     The regenerative deodorizing filter may include an adsorption section defined by a circular segment having a predetermined circumferential angle, and a desorption section defined by the remaining circular segment other than the adsorption section, and the regenerative deodorizing filter includes a rotary rotor, which is rotatably installed in the filter. 
     The rotary rotor may be made of single component or multiple components selected from among zeolite, activated alumina, porous silica, activated carbon and diatomite, which have a high adsorptive capacity with respect to gaseous substances, and the rotary rotor may include a support having a low air resistance, and single component or multiple components selected from among zeolite, activated alumina, porous silica, activated carbon and diatomite, which are applied to the support and have a high adsorptive capacity with respect to gaseous substances. 
     Also, the desorption means may include: a heating unit to heat air supplied to the desorption section of the regenerative deodorizing filter; a desorption air treatment unit to purify and treat gaseous substances contained in the air introduced therein, in which the air is heated by the heating unit and is passed through the desorption section while entraining the gaseous substances; and an air transfer unit to enable the air, which is purified and treated by the desorption air treatment unit, to be discharged outside or to be introduced into the regenerative deodorizing filter for retreatment. 
     Also, the desorption means may include: a heat exchanger through which air directed to the desorption section of the regenerative deodorizing filter passes; a desorption air treatment unit to purify and treat gaseous substances contained in the air introduced therein, in which the air is passed through the heat exchanger and is passed through the desorption section while entraining the gaseous substances; and an air transfer unit to enable the air, which is purified and treated by the desorption air treatment unit and is passed through the heat exchanger while exchanging heat with air directed to the desorption sector of the regenerative deodorizing filter, to be discharged outside or to be introduced into the regenerative deodorizing filter for retreatment. 
     Also, the desorption means may include: a heating unit to heat air supplied to the desorption section of the regenerative deodorizing filter; a heat exchanger through which the air, which is passed through the heating unit and is passed through the desorption section while entraining gaseous substances therein, passes; a desorption air treatment unit to purify and treat gaseous substances contained in the air, which is passed through the heat exchanger and is introduced therein; and an air transfer unit to enable the air, which is purified and treated by the desorption air treatment unit and is passed through the heat exchanger while exchanging heat with air passed through the desorption sector of the regenerative deodorizing filter, to be discharged outside or to be introduced into the regenerative deodorizing filter for retreatment. 
     In this case, the heating unit may be positioned between the heat exchanger and the air transfer unit so that air passed through the heat exchanger exchanges heat with air supplied to the desorption section of the regenerative deodorizing filter. 
     The regenerative deodorizing filter may include an adsorption section defined by a circular segment having a predetermined circumferential angle, and cooling and desorption sections defined by the remaining circular segment other than the adsorption section, and the regenerative deodorizing filter includes a rotary rotor, which is rotatably installed in the filter. 
     In this case, the desorption means may include: a heating unit to heat air passed through the cooling section of the regenerative deodorizing filter and to supply the air to the desorption section; a desorption air treatment unit to purify and treat gaseous substances contained in the air introduced therein, in which the air is heated by the heating unit and is passed through the desorption section while entraining the gaseous substances; and an air transfer unit to enable the air, which is purified and treated by the desorption air treatment unit and is passed through the heating unit while exchanging heat with air passed through the cooling section, to be discharged outside or to be introduced into the regenerative deodorizing filter for retreatment. 
     Also, the desorption means may include: a heating unit to heat air passed through the cooling section of the regenerative deodorizing filter and to supply the air to the desorption section; a heat exchanger to exchange heat with the air, which is heated by the heating unit and is passed through the desorption section while entraining gaseous substances therein; a desorption air treatment unit to purify and treat the gaseous substances contained in the air passed through the heat exchanger; and an air transfer unit to enable the air, which is purified and treated by the desorption air treatment unit and is passed through the heat exchanger while exchanging heat with air passed through the desorption section, to be discharged outside or to be introduced into the regenerative deodorizing filter for retreatment. 
     Also, the desorption means may include: an air transfer unit to draw air into the desorption section of the regenerative deodorizing filter; a pressure-regulating unit to regulate a pressure of air supplied to the regenerative odorizing filter; and a desorption air treatment unit to purify and treat gaseous substances contained in the air passed through the regenerative deodorizing filter by the air transfer unit. 
     The desorption air treatment unit may include one or more selected from among a catalytic oxidation unit, an absorbent adsorption unit, a cold condensation unit, a photocatalytic treatment unit and an ozone oxidation unit, and the desorption air treatment unit may be a catalytic oxidation unit which comprises a heater to heat interior air to a predetermined temperature, and a catalytic layer to catalytically oxidize and thus burn gaseous substances contained in air introduced therein. 
     The air supplied to the desorption section of the regenerative deodorizing may be heated to a temperature ranging from 50° C. to 300° C. 
     The air passed through the desorption air treatment unit may be maintained in a temperature ranging from 50° C. to 400° C. 
     The heater may preheat the interior of the desorption air treatment unit to a temperature of 50° C. or more. 
     The air cleaner may further include a post-treatment filter which is configured to purify and treat substances, which remain in the air passed through the regenerative deodorizing filter and introduced therein and is not yet purified and treated, and to apply negative ions and far infrared rays to the air. 
     In another aspect, the present invention provides a method of regenerating the regenerative deodorizing filter of the air cleaner, the method comprising: (a) purifying and treating particulate substances contained in introduced air using a filter; (b) purifying and treating gaseous substances contained in introduced air using a regenerative deodorizing filter; and (c) desorbing the gaseous substances adsorbed on the regenerative deodorizing filter for purification and treatment, thus enabling continuous regeneration of the regenerative deodorizing filter. 
    
    
     
       DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a schematic view showing a configuration of an air cleaner according to a first embodiment of the present invention; 
         FIG. 2  is a front view showing a regenerative deodorizing filter incorporated in the air cleaner of  FIG. 1 ; 
         FIG. 3  is a view showing a variant embodiment in which a gas sensor is disposed beside a side of the regenerative deodorizing filter according to the first embodiment of the present invention; 
         FIG. 4  is a view showing a variant embodiment in which a catalytic oxidation unit is applied as the desorption air treatment unit in the air cleaner according to the first embodiment of the present invention; 
         FIG. 5  is a schematic view showing a configuration of an air cleaner according to a second embodiment of the present invention; 
         FIG. 6  is a schematic view showing a configuration of an air cleaner according to a third embodiment of the present invention; 
         FIG. 7  is a view showing a variant embodiment of the third embodiment of the present invention, which is configured such that the flowing direction of air supplied to the desorption section of the regenerative deodorizing filter is reversed, as opposed to the air cleaner according to the third embodiment (see  FIG. 6 ); 
         FIG. 8  is a schematic view showing a configuration of an air cleaner according to a fourth embodiment of the present invention; 
         FIG. 9  is a view showing a variant embodiment of the fourth embodiment of the present invention, which is configured such that the flowing direction of air supplied to the desorption section of the regenerative deodorizing filter is reversed, as opposed to the air cleaner according to the fourth embodiment (see  FIG. 8 ); 
         FIG. 10  is a schematic view showing a configuration of an air cleaner according to a fifth embodiment of the present invention; 
         FIG. 11  is a view showing a variant embodiment of the fifth embodiment of the present invention, which is configured such that the flowing direction of air supplied to the desorption section of the regenerative deodorizing filter is reversed, as opposed to the air cleaner according to the fifth embodiment (see  FIG. 10 ); 
         FIG. 12  is a schematic view showing a configuration of an air cleaner according to a sixth embodiment of the present invention; 
         FIG. 13  shows a front view and a perspective view of a regenerative deodorizing filter of the air cleaner according to the sixth embodiment of the present invention; 
         FIG. 14  is a schematic view showing an air cleaner according to a seventh embodiment of the present invention; and 
         FIG. 15  is a schematic view showing an air cleaner according to an Eighth embodiment of the present invention. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     
         
           1 : air cleaner 
           2 ,  20 : filter for removing particulate substances 
           30 : regenerative deodorizing filter 
           32 : adsorption section 
           34 : desorption section 
           34   a : cooling section 
           36 : adsorption rotor 
           40 ,  50 : post-treatment filter 
           60 : air transfer unit 
           100 ,  200 ,  300 ,  400 ,  500 ,  600 : desorption means 
           110 ,  410 ,  610 : heating unit 
           120 ,  230 ,  320 ,  430 ,  520 ,  630 : desorption air treatment unit 
           122 ,  322 ,  432 ,  522 ,  632 : heater 
           124 ,  324 ,  434 ,  524 ,  634 : catalytic layer 
           130 ,  220 ,  330 ,  440 ,  530 ,  640 : desorption air transfer unit 
           140 : gas sensor 
           210 : air pressure-regulating unit 
       
    
     Hereinafter, the present invention will be described in more detail, with reference to the embodiments shown in the accompanying drawings. 
       FIG. 1  is a schematic view showing a configuration of an air cleaner according to a first embodiment of the present invention, and  FIG. 2  is a front view showing a regenerative deodorizing filter incorporated in the air cleaner of  FIG. 1 . 
     As shown in the drawings, the air cleaner  1  according to the first embodiment of the present invention comprises a coarse filter  10  for removing coarse particulate substances, a fine filter  20  for removing fine particulate substance, a regenerative deodorizing filter  30 , a plurality of post-treatment filter  30 , and an air transfer unit  60 , all of which are sequentially disposed in this order along an air transfer path  2 . 
     In this configuration, the filters  10 ,  20 ,  40 ,  50 , other than the regenerative odorizing filter  30 , may be changed in the disposition sequence and may be further provided or removed, if required. 
     Although each of the coarse filter  10  for removing coarse particulate substances and the fine filter  20  for removing fine particulate substances is not limited to the number, it is preferably provided in a plural number so as to achieve efficient removal of dust, bacteria and the like. The filters may include an air filter, a medium filter, an HEPA filter and the like, which are well known in the art, and may include an electrostatic precipitation type electrostatic filter in some cases. 
     As shown in  FIG. 2 , the regenerative deodorizing filter  30  comprises an adsorption section  32  defined by a circular segment having a predetermined circumferential angle and on which gaseous substances are adsorbed, and a desorption section  34  defined by the remaining circular segment other than the adsorption section  32  and from which the gaseous substances are desorbed by virtue of the desorbing energy. The regenerative deodorizing filter  30  further includes an adsorption rotor  36  therein, which is installed to be rotated. 
     The adsorption rotor  36  may be operated in such a way that it conducts the repetitive adsorption and desorption for gaseous substances while continuously rotating. More specifically, the adsorption rotor may be operated in such a way that it first conducts only the adsorption operation without the rotation, and then conducts the desorption operation while rotating when the adsorption section  32  reaches the breakthrough point after elapse of a predetermined period of time. 
     The adsorption rotor  36  in the regenerative deodorizing filter  30  may be prepared in such a manner that a starting material comprised of single component or multiple components selected from among zeolite, porous silica, activated alumina, activated carbon and diatomite is formed into a desired shape, or a bent honeycombed support, which is excellent in air permeability, is coated with the adsorbing component. 
     The post-treatment filter  40  and  50  function to further treat the particulate substances and the gaseous substance remaining in the air flowed from the regenerative deodorizing filter  30  to make them more clean, or to emit antibacterial agent such as negative ions, far-infrared rays, etc., to make air more pleasant. Subsequently, the air, which is flowed from the post-treatment filters  40  and  50 , is discharged to the outside of the air cleaner  1  by virtue of the air transfer unit  60 . 
     The gaseous substances, adsorbed on the adsorption rotor  36  of the regenerative deodorizing filter  30 , is desorbed from the filter in the desorption section by desorption means  100 , which will be described later, due to the rotation of the adsorption rotor  36 . 
     The desorption means  100  comprises a heating unit  110  which is intended to heat the air, introduced in the desorption section  34  of the regenerative deodorizing filter  30 , to the adsorption temperature or higher, an desorption air treatment unit  120  which is intended to purify the air containing the gaseous substances desorbed from the desorption section  34 , and a desorption air transfer unit  130  which is intended to blow the air flowed from the desorption air treatment unit  120 . 
     In this regard, a temperature of the air, which is heated using the heating unit  110 , may be within a range from 50° C. to 700° C., and preferably within a range from 50° C. to 300° C. 
     Although the desorption air treatment unit  120  is preferably operated through a catalytic oxidation, it may be operated through any of an adsorption by absorbent, a cold condensation, a treatment by photocatalyst, an oxidation by ozone, and a combination thereof without limitation. 
     In the case of an installation site at which the air that contains gaseous substances desorbed from the desorption section  34  of the regenerative deodorization filter  30  can be discharged outside, the air containing the desorbed gaseous substances may be directly discharged outside. However, since a typical air cleaner is operated in an enclosed space, it is preferable to have the desorption air treatment unit  120  as mentioned above, and it is further preferable to introduce the air, flowed from the desorption air treatment unit  120 , into the air cleaner  1  again for the retreatment. 
     The process of purifying air using the air cleaner  1 , which is constructed in the above-described manner, will be described below. 
     Air is first introduced into the air cleaner  1 , and particulate substances such as dust, bacteria, etc., contained in the air are filtered by the coarse filter  10  and the fine filter  20 . As the air, from which the particulate substances are removed, passes through the regenerative deodorizing filter  30 , gaseous substances such as offensive odors, volatile organic compounds and detrimental constituents are filtered. Thereafter, when the air, from which the gaseous substances are removed, passes through the post-treatment filters  40  and  50 , negative ions, far-infrared rays and antibacterial substances such as catechin are applied to the air, and the air is then discharged into the interior of room through the air transfer unit  60 . 
     The gaseous substances, which are filtered while passing through the regenerative deodorizing filter  30 , are adsorbed on the adsorption rotor  36  which is rotatably provided in the regenerative deodorizing filter  30 . As the adsorption rotor  36  is rotated, the gaseous substances are desorbed from the filter by the desorption means  100  associated with the desorption section  34 , and thus the regenerative deodorizing filter is regenerated. 
     In other words, as air, which is heated to a predetermined temperature by the heating unit  110  installed in association with the desorpiton section  34  of the regenerative deodorizing filter  30 , is blown through the regenerative deodorizing filter, the gaseous substances, adsorbed on the region of the adsorption rotor which is positioned at the adsorption section  34 , are desorbed from the filter. Subsequently, the gaseous substances, which are desorbed from the filter, are purified and treated through the desorption air treatment unit  120 , and are then introduced into the air cleaner  1  again by the desorption air transfer unit  130  for the retreatment. 
     At this point, the air containing the gaseous substances desorbed from the desorption section  34  may be discharged to the outside of the room. 
     As such, since the adsorption rotor  36  is configured to be rotatable, the entire area of the adsorption rotor is progressively passed over by the desorption section  34  by virtue of the rotation of the adsorption rotor, so that the gaseous substance adsorbed on the entire area of the adsorption rotor  36  can be desorbed therefrom, and can be thus regenerated. 
       FIG. 3  is a view showing a variant embodiment in which a gas sensor is disposed beside a side of the regenerative deodorizing filter according to the first embodiment of the present invention. As shown in the drawing, this air cleaner may be operated in such a manner that the gas sensor  140  detects the concentration of gaseous substances adsorbed on the regenerative deodorizing filter  30 , and whether the regenerative deodorizing filter  30  must be regenerated is determined based on the detected concentration, followed by conduction of the desorption operation depending on the detected result. 
     More specifically, when the concentration of the gaseous substances adsorbed on the regenerative deodorizing filter  30  is equal to or higher than a predetermined value, a drive unit  38  of the regenerative deodorizing filter  30  and a drive unit  132  of the desorption air transfer unit  130  are operated, thus regenerating the regenerative deodorizing filter  30 . In contrast, the concentration of the gaseous substances is lower than the predetermined value, the operation of the drive unit  38  and the drive unit  132  is not conducted, thus achieving realization of the optimal treatment efficiency thanks to the low operational cost. 
     In other words, the amount of gaseous substances adsorbed on the regenerative deodorizing filter  30  inevitably varies depending on the conditions where the air cleaner  1  is used, and thus the frequency of replacement varies. In the conditions where the environmental contamination is relatively low, when the regenerative deodorizing filter  30  and the desorption means  100  are continuously operated without cease, undesired operational cost may be brought about. Accordingly, as in this configuration, it is preferable that the regenerating operation of the regenerative deodorizing filter  30  is timely conducted depending on the concentration of the gaseous substances adsorbed on the regenerative deodorizing filter  30 . 
       FIG. 4  is a view showing a variant embodiment in which a catalytic oxidation unit is applied as the desorption air treatment unit in the air cleaner according to the first embodiment of the present invention. As shown in the drawing, the catalytic oxidation unit, which is applied as the desorption air treatment unit  120 , may comprise a heater  122  for heating the interior of the unit, and a catalytic layer  124  for catalytically oxidizing and burning gaseous substances passing therethrough. 
     In this context, it is preferable that the heater  122  heats the interior of the catalytic oxidation unit  120  to a temperature of 50° C. or more, and the temperature at which the gaseous substances are oxidized and decomposed is optimally maintained in a range from 50° C. to 400° C. 
       FIG. 5  is a schematic view showing a configuration of an air cleaner according to a second embodiment of the present invention. 
     In the description of the second embodiment of the present invention, the same reference numerals are used throughout the description to designate the same as or similar to components disclosed in the first embodiment, and the redundant description relating to the components is omitted for clarity. 
     The air cleaner  1  according to the second embodiment of the present invention is configured such that the desorption means of the regenerative deodorizing filter is replaced with a different desorption means that employs a desorption by a pressure rather than high temperature. 
     The desorption means  200  comprises a pressure-regulating unit  210  for regulating a pressure of air supplied to the desorption section  34 , a desorption air transfer unit  220  for drawing in the air that has been regulated in pressure through the pressure-regulating unit  210  and thus causing the air to pass through the desorption section  34  of the regenerative deodorizing filter  30 , thereby realizing the desorption of gaseous substances, and a desorption air treatment unit  230  for purifying and treating the air, which is drawn by the desorption air transfer unit  220  and contains the desorbed gaseous substances. 
     Although the desorption air treatment unit  230  is preferably operated through a catalytic oxidation, it may be operated through any of an adsorption by absorbent, a cold condensation, a treatment by photocatalyst, an oxidation by ozone, and a combination thereof without limitation. 
     The process of purifying air using the air cleaner, which is constructed in the above-described manner, will be described below. 
     Air is first introduced into the air cleaner  1 , and particulate substances such as dust, bacteria, etc., contained in the air are filtered by the coarse filter  10  and the fine filter  20 . As the air, from which the particulate substances are removed, passes through the regenerative deodorizing filter  30 , gaseous substances such as offensive odors, volatile organic compounds and detrimental constituents are filtered. Thereafter, when the air, from which the gaseous substances are removed, passes through the post-treatment filters  40  and  50 , negative ions, far-infrared rays and antibacterial substances such as catechin are applied to the air, and the air is then discharged into the interior of room through the air transfer unit  60 . 
     The gaseous substances, which are filtered while passing through the regenerative deodorizing filter  30 , are adsorbed on the adsorption rotor  36  which is rotatably provided in the regenerative deodorizing filter  30 . As the adsorption rotor  36  is rotated, the gaseous substances are desorbed from the filter by the desorption means  200  associated with the desorption section  34 , and thus the regenerative deodorizing filter is regenerated. 
     In other words, as air, which is regulated to a predetermined pressure by the pressure-regulating unit  210  installed in association with the desorpiton section  34  of the regenerative deodorizing filter  30 , is blown through the regenerative deodorizing filter, the gaseous substances, adsorbed on the region of the adsorption rotor  36  which is positioned at the adsorption section  34 , are desorbed from the filter. Subsequently, the gaseous substances, which is desorbed from the filter, are purified and treated through the desorption air treatment unit  230 . 
     In this regard, the desorption air transfer unit  220  draws in the air, which has been regulated in pressure by the pressure-regulating unit  210 , so that the air is flowed from the desorption section  34 , and then transfers the air to the adsorption air treatment unit  230 . 
       FIG. 6  is a schematic view showing a configuration of an air cleaner according to a third embodiment of the present invention. 
     In the description of the third embodiment of the present invention, the same reference numerals are used throughout the description to designate the same as or similar to components disclosed in the first and second embodiments, and the redundant description relating to the components is omitted for clarity. 
     The air cleaner  1  according to the third embodiment of the present invention is configured such that the desorption means of the regenerative deodorizing filter  30  is operated to desorb gaseous substances using high temperature, in which a desorption air treatment unit  320  is applied as the catalytic oxidation unit. 
     The desorption means  300  comprises a heat exchanger  310  for exchanging air, supplied to the desorption section  34 , with heat and thus heating the air, a catalytic oxidation unit  320  for purifying and treating the air, which contains gaseous substances desorbed from the desorption section  34 , by the heated air flowed from the heat exchanger  310 , and a desorption air transfer unit  330  for blowing out the air flowed from the catalytic oxidation unit  320 . 
     The catalytic oxidation unit  320  comprises a heater  322  for preheating the interior of the catalytic oxidation unit to a temperature of 50° C. or more, and a catalytic layer  324  for oxidizing and decomposing the air introduced therein. Here, although the optimal temperature at which the gaseous substances are oxidized and decomposed is preferably in a range from 50° C. to 400° C., the optimal temperature may vary depending on the constituent concentration of the gaseous substances. 
     The air, which has been purified and treated through the catalytic oxidation unit  320  and has a high temperature, is introduced into the heat exchanger  310  where the air exchanges the air, which is supplied to the desorption section  34  of the regenerative deodorizing filter  340 , with heat, thus heating the air supplied to the desorption section  34  to a high temperature of a range from 50° C. to 300° C. Subsequently, the air is discharged outside through the desorption air transfer unit  330 , or is further introduced into the upstream end of the regenerative deodorizing filter  30  such that the gaseous substances remaining in the air is further treated. 
     The process of purifying air using the air cleaner, which is constructed in the above-described manner, will be described below. 
     Air is first introduced into the air cleaner, and particulate substances such as dust, bacteria, etc., contained in the air are filtered by the coarse filter  10  and the fine filter  20 . As the air, from which the particulate substances are removed, passes through the regenerative deodorizing filter  30 , gaseous substances such as offensive odors, volatile organic compounds and detrimental constituents are filtered. Thereafter, when the air, from which the gaseous substances are removed, passes through the post-treatment filters  40  and  50 , negative ions, far-infrared rays and antibacterial substances such as catechin are applied to the air, and the air is then discharged into the interior of room through the air transfer unit  60 . 
     The gaseous substances, which are filtered while passing through the regenerative deodorizing filter  30 , are adsorbed on the adsorption rotor  36  which is rotatably provided in the regenerative deodorizing filter  30 . As the adsorption rotor  36  is rotated, the gaseous substances are desorbed from the filter by the desorption means  300  associated with the desorption section  34 , and thus the regenerative deodorizing filter is regenerated. 
     In other words, as air, which is controlled to a predetermined temperature by the heat exchanger  310  installed in association with the desorpiton section  34  of the regenerative deodorizing filter  30 , is blown through the regenerative deodorizing filter, the gaseous substances, adsorbed on the region of the adsorption rotor  36  which is positioned at the adsorption section  34 , are desorbed from the filter. Subsequently, the gaseous substances, which is desorbed from the filter, are purified and treated through the catalytic layer  324  of the catalytic oxidation unit  320 . 
     At this point, the internal temperature of the catalytic oxidation unit  320  remains in a range from 50° C. to 400° C., and the air, in which the gaseous substances are oxidized and decomposed, still maintains the high temperature and passes through the heat exchanger  310 . Thereafter, the air having the high temperature causes the air supplied to the desorption section  34  of the regenerative deodorizing filter  30  to be raised to a predetermined temperature, i.e., a temperature ranging from 50° C. to 300° C. through the heat-exchanging procedure, and is discharged outside using the desorption air transfer unit  330  or introduced into the upstream end of the regenerative deodorizing filter  30  for the retreatment. 
     For reference,  FIG. 7  shows a variant embodiment of the third embodiment of the present invention, which is configured such that the flowing direction of air supplied to the desorption section of the regenerative deodorizing filter is reversed, as opposed to the air cleaner according to the third embodiment (see  FIG. 6 ). In this variant embodiment, since details relating to the configuration and the operation are the same as those of the third embodiment, the redundant description is omitted herein. 
       FIG. 8  is a schematic view showing a configuration of an air cleaner according to a fourth embodiment of the present invention. As shown in the drawing, this embodiment is configured such that desorption means  400  further comprises a heating unit  410  for heating air supplied to the desorption section  34  of the regenerative deodorizing filter  30 . In the description of the fourth embodiment of the present invention, the same reference numerals are used throughout the description to designate the same as or similar to components disclosed in the previous embodiments, and the redundant description relating to the components is omitted for clarity. 
     The desorption means  400  of the fourth embodiment of the present invention may comprise the heating unit  410  for heating the air, which is supplied to the desorption section  34  of the regenerative deodorizing filter  30 , to a predetermined temperature ranging from 50° C. to 300° C., a heat exchanger  420  through which the air, which is heated by the heating unit  410  and contains gaseous substances desorbed from the desorption section  34  of the regenerative deodorizing filter  30 , passes, a catalytic oxidation unit  430  for purifying and treating the air flowed from the heat exchanger  420 , and a desorption air transfer unit  440  for discharging the purified air flowed from the catalytic oxidation unit  430  outside or introducing the air into the upstream end of the regenerative deodorizing filter  30  of the air cleaner again for the retreatment. 
     The heat exchanger  420  is configured such that the air flowed from the desorption section  34  passes therethrough in one direction while the air flowed from the catalytic oxidation unit  430  passes therethrough in another direction different from the one direction. As a result, the air flowed from the desorption section  34  can be heated to a higher temperature by virtue of the air passed through the catalytic oxidation unit  430  and thus having a high temperature. 
     Among the reference numerals in the drawing, which have not been mentioned, reference numeral  432  represents a heater incorporated in the catalytic oxidation unit, and reference numeral  434  represents a catalytic layer. 
     For reference,  FIG. 9  shows a variant embodiment of the fourth embodiment of the present invention, which is configured such that the flowing direction of air supplied to the desorption section of the regenerative deodorizing filter is reversed, as opposed to the air cleaner according to the fourth embodiment (see  FIG. 8 ). In this variant embodiment, since details relating to the configuration and the operation are the same as those of the fourth embodiment, the redundant description is omitted herein. 
       FIG. 10  is a schematic view showing a configuration of an air cleaner according to a fifth embodiment of the present invention. This embodiment is configured such that, unlike the configuration of the air cleaner according to the fourth embodiment of the present invention, the heating unit  410 , which is intended to supply heated air to the desorption section  34  of the regenerative deodorizing filter  30 , is changed to be positioned between the heat exchanger  420  and the desorption air transfer unit  440 . In the description of the fifth embodiment of the present invention, the same reference numerals are used throughout the description to designate the same as or similar to components disclosed in the previous embodiments, and the redundant description relating to the components is omitted for clarity. 
     More specifically, when the heating unit  410  is disposed between the heat exchanger  420  and the desorption air transfer unit  440 , the air, which is flowed from the catalytic oxidation unit  430  and the heat exchanger  420  and is thus purified and heated due to the passage, passes through the heating unit  410  while exchanging heat with the air supplied to the desorption section  34  of the regenerative deodorizing filter  30 , thus making it easy to heat the air, supplied to the desorption section  34  of the regenerative deodorizing filter  30 , to the predetermined temperature raging from 50° C. to 300° C. 
     For reference,  FIG. 11  shows a variant embodiment of the fifth embodiment of the present invention, which is configured such that the flowing direction of air supplied to the desorption section of the regenerative deodorizing filter is reversed, as opposed to the air cleaner according to the fifth embodiment (see  FIG. 10 ). In this variant embodiment, since details relating to the configuration and the operation are the same as those of the fifth embodiment, the redundant description is omitted herein. 
       FIG. 12  is a schematic view showing a configuration of an air cleaner according to a sixth embodiment of the present invention, and  FIG. 13  shows a front view and a perspective view of a regenerative deodorizing filter of the air cleaner according to the sixth embodiment of the present invention. 
     The sixth embodiment of the present invention is configured such that the regenerative deodorizing filter  30  includes a cooling section  34   a  as a portion thereof so as to prevent the entire region of the adsorption rotor  36  from being excessively heated due to the passage of the heated air through the desorption section  34  of the regenerative deodorizing filter  30 . This embodiment is substantially identical to the previous embodiments in configuration and operation with the exception of desorption means  500  adapted to desorb gaseous substances adsorbed on the area of the adsorption rotor  36  which is positioned at the desorption section  34  of the regenerative deodorizing filter  30 . Accordingly, the same reference numerals are used throughout the description to designate the same as or similar to components disclosed in the previous embodiments, and the redundant description relating to the components is omitted for clarity. 
     As shown in  FIG. 13 , the regenerative deodorizing filter  30  includes the adsorption rotor  36  rotatably incorporated therein. Further, the regenerative deodorizing filter  30  comprises an adsorption section  32  which adsorbs gaseous substances on the circumferential region thereof, a desorption section  34  at which the gaseous substances are desorbed therefrom, and the cooling section  34   a.    
     More specifically, the adsorption section  32  is defined by a circular segment of the regenerative deodorizing filter  30  having a predetermined circumferential angle, and the desorption section  34  and the cooling section  34   a  are defined by the remaining circular segment other than the adsorption section  32 . 
     The desorption means  500 , which is adapted to desorb the gaseous substances adsorbed on the adsorption rotor  36  and positioned at the desorption section  34  of the regenerative deodorizing filter  30 , comprises a heating unit  510  for heating air supplied to the desorption section of the regenerative deodorizing filter  30  to a desorption temperature equal to or higher than an adsorption temperature, a desorption air treatment unit  520  for purifying and treating the air containing the gaseous substances desorbed from the desorption section  34 , and a desorption air transfer unit  530  for blowing out the air flowed from the desorption air treatment unit  520 . 
     In this regard, the air, which is to be supplied to the heating unit  510 , is supplied through the cooling section  34   a  of the regenerative odorizing filter  30 . 
     As the desorption air treatment unit  520 , a catalytic oxidation unit including a heater  522  and a catalytic layer  524  is preferably applied. 
     The operation of the air cleaner according to the sixth embodiment of the present invention, which is constructed in the above-described manner, will be described below. 
     Air is heated to a predetermined temperature while passing through the heating unit  510  disposed beside a side of the desorption section  34  of the regenerative deodorizing filter  30 , and is passed through the regenerative deodorizing filter  30 . At this time, gaseous substances, adsorbed on the portion of the adsorption rotor  36  which is positioned at the desorption section  34 , are desorbed therefrom and entrained in the air. The air containing the gaseous substances is purified and treated by the desorption air treatment unit  520 , and then is discharged outside or introduced into the air cleaner  1  again by virtue of the desorption air transfer unit  530  for the retreatment. 
     As such, since the adsorption rotor  36  is configured to be rotatable, the entire area of the adsorption rotor is progressively passed over by the desorption section  34  by virtue of the rotation of the adsorption rotor, so that the gaseous substance adsorbed on the entire area of the adsorption rotor  36  can be desorbed therefrom, and can be thus regenerated. 
     Meanwhile, since the air, which is heated by the heating unit  510 , is blown to the desorption section  34  while the adsorption rotor  36  continuously rotates and passes over the desorption section  34 , there is a risk of overheating of the adsorption rotor  36  because of the continuous rotation of the adsorption rotor  36 . 
     To overcome such a problem, air having an ambient temperature is supplied to the heating unit  510  through the cooling section  34   a  of the regenerative deodorizing filter  30 , so that the supplied air cools the adsorption rotor  36  which is heated due to the air which passes through the desorption section  34  and has a high temperature, thus eliminating such a problem. 
       FIG. 14  is a schematic view showing an air cleaner according to a seventh embodiment of the present invention, which is a modification of the above-described sixth embodiment. In the description of this modification, the same reference numerals are used throughout the description to designate the same as or similar to components disclosed in the first embodiment, and the redundant description relating to the components is omitted for clarity. 
     As shown in the drawing, desorption means  600  of the air cleaner according to the seventh embodiment of the present invention comprises a heating unit  610  for heating the air, which is supplied to the desorption section  34  of the regenerative deodorizing filter  30 , to a predetermined desorption temperature higher than a adsorption temperature, a heat exchanger  620  through which the air, which contains gaseous substances desorbed from the desorption section  34 , passes, a desorption air treatment unit  630  for purifying and treating the air flowed from the heat exchanger  620 , and a desorption air transfer unit  640  for discharging the air, which has been passed through the desorption air treatment unit  630  and the heat exchanger  620 , outside, or introducing the air into the air cleaner again for the retreatment. 
     The heat exchanger  620  is configured such that the air, which has passed through the desorption section  34  and thus contains the gaseous substance therein, flows therethrough in one direction while the air, which has passed through the desorption air treatment unit  630  and thus purified and treated, flows therethrough in another direction perpendicular to the one direction. 
     As a result, the air flowed from the desorption section  34  can be heated to a higher temperature while passing through the desorption air treatment unit  630 , by virtue of the exchange of heat with the air, which has a temperature ranging from 50° C. to 400° C., and the heated air is supplied to the desorption air transfer unit  640 . 
     Among the reference numerals in the drawing, which have not been mentioned, reference numeral  632  represents a heater incorporated in the desorption air treatment unit, and reference numeral  634  represents a catalytic layer. 
     Since the operation of purifying and treating the air is the same as that of the previous embodiments, the redundant description thereof is omitted for clarity. 
       FIG. 15  is a schematic view showing an air cleaner according to an Eighth embodiment of the present invention, which is a modification of the above-described sixth and seventh embodiments. In the description of this modification, the same reference numerals are used throughout the description to designate the same as or similar to components disclosed in the first embodiment, and the redundant description relating to the components is omitted for clarity. 
     As shown in the drawing, desorption means  600  of the air cleaner according to the Eighth embodiment of the present invention comprises a heating unit  610  for heating the air, which is supplied to the desorption section  34  of the regenerative deodorizing filter  30 , to a predetermined desorption temperature higher than a adsorption temperature, a heat exchanger  620  through which the air, which contains gaseous substances desorbed from the desorption section  34 , passes, a desorption air treatment unit  630  for purifying and treating the air flowed from the heat exchanger  620 , and a desorption air transfer unit  640  for discharging the air, which has been passed through the desorption air treatment unit  630  and the heat exchanger  620  and then has passed through the heating unit  610 . 
     The heat exchanger  620  is configured such that the air, which has passed through the desorption section  34  and thus contains the gaseous substance therein, flows therethrough in one direction while the air, which has passed through the desorption air treatment unit  630  and thus purified and treated, flows therethrough in another direction perpendicular to the one direction. 
     As a result, the air flowed from the desorption section  34  can be heated to a higher temperature while passing through the heat exchanger  620 , by virtue of the exchange of heat with the air, which has a temperature ranging from 50° C. to 400° C., and the heated air is supplied to the desorption air treatment unit  630 . 
     Subsequently, the air passes through the desorption air treatment unit  630  and the heat exchanger  620 , and then passes through the heat exchanger  610  again while exchanging heat with the air passing through the regenerative deodorizing filter  30 . 
     Therefore, the air supplied to the heating unit  610 , which has been passed through the cooling section  34   a  of the regenerative deodorizing filter  30 , is heated by virtue of the exchanging heat with the air, which has been passed through the desorption air treatment  630  and the heat exchanger  620  and thus has been heated to a high temperature. 
     For reference, among the reference numerals in the drawing, which have not been mentioned, reference numeral  632  represents a heater incorporated in the desorption air treatment unit, and reference numeral  634  represents a catalytic layer. 
     Since the operation of purifying and treating the air is the same as that of the previous sixth and seventh embodiments, the redundant description thereof is omitted for clarity.