US20200141594A1

US20200141594A1 - Indoor Fresh Air Apparatus

Info

Publication number: US20200141594A1
Application number: US15/519,794
Authority: US
Inventors: Chuanjing ZHANG; Guodong YE
Original assignee: China Merchants Real Estate Shenzhen co ltd
Current assignee: China Merchants Real Estate Shenzhen co ltd
Priority date: 2017-03-03
Filing date: 2017-03-03
Publication date: 2020-05-07
Also published as: WO2018157394A1

Abstract

The present invention provides an indoor fresh air apparatus, comprising a body, an elementary filtering means, a deodorizing module, a blowing-in machine, a first haze removing module, a second haze removing module and a third haze removing module. The body is provided with an air-in passage serving as an air-in end and an air-out passage serving as an air-out end. The elementary filtering means is disposed at the air-in end; the deodorizing module is disposed within the air-in passage; and the blowing-in machine is disposed at the air-out end. The air-in passage, the first haze removing module, the second haze removing module, the third haze removing module and the air-out passage are connected in order. The air treatment unit provided by the present invention is capable of not only completely recovering cold energy or heat energy of indoor air, but also effectively treating indoor and outdoor PM2.5 and harmful gases.

Description

TECHNICAL FIELD

The present invention relates to a technology of handling indoor and outdoor air flow in a building, and in particular to an indoor fresh air apparatus.

BACKGROUND OF THE INVENTION

PM2.5 and formaldehyde in air influence people's life and health; therefore, it has become a hot research topic for domestic and foreign experts of how to effectively remove indoor and outdoor PM2.5 and indoor formaldehyde and Volatile Organic Compounds (VOCs). At present, a wide variety of fresh air fans for removing PM2.5 and harmful gases such as formaldehyde and VOC in air may be found on the market, which, however, can hardly meet practical requirements in real estate development due to defects thereof, including being influenced by ventilation resistance of a filtering means, complicated maintenance and replacement, large structure size, difficult energy recovery, etc. In addition, although an air cleaning functional part is usually disposed within a common air conditioner, the air cleaning functional part can only provide a highly limited cleaning conditioning function without completely meeting comprehensive pollution treatment requirements such as PM2.5 removal, sterilization and disinfection due to limitations of ventilation resistance and installation space.

SUMMARY OF THE INVENTION

An objective of the present invention is to provide an indoor fresh air apparatus that may draw in outdoor fresh air and may also treat indoor and outdoor PM2.5 and indoor harmful gases and odors.
To achieve the above objective, the present invention provides an indoor fresh air apparatus, comprising a body that is provided with an air-in passage having one end serving as an air-in end and an air-out passage having one end serving as an air-out end, an elementary filtering means disposed at the air-in end, a deodorizing module disposed within the air-in passage, and a blowing-in machine disposed at the air-out end. The indoor fresh air apparatus further comprises:
a first haze removing module, a second haze removing module and a third haze removing module, with the air-in passage, the first haze removing module, the second haze removing module, the third haze removing module and the air-out passage being connected in order, wherein
the first haze removing module comprises a first cavity, a plurality of spray units disposed within the first cavity, and a plurality of ultrasonic units disposed on two opposite sides of an inner wall of the first cavity;
the second haze removing module comprises a second cavity, a plurality of diversion parts, a filtering part and a plurality of fans, wherein the filtering part is disposed along a center line in a length direction of the second cavity; the diversion part comprises a first diversion plate, a second diversion plate and a third diversion plate that define a first channel together with a sidewall of the second cavity, with the second diversion plate forming a side, opposite to the sidewall of the second cavity, of the first channel, the first diversion plate having one end connected to the sidewall of the second cavity and being disposed at an air-in side of the first channel, and the third diversion plate having one end connected to the sidewall of the second cavity and being disposed at an air-out side of the first channel;
two adjacent diversion parts are disposed at two opposite sides of the second cavity and the air-out side of the anterior diversion part corresponds to the air-in side of the posterior diversion part;
and the fans are disposed at a side, opposite to the first channels, of the second cavity, and arranged corresponding to the air-in sides of the first channels.
and the third haze removing module comprises a spiral channel, a sticky capillary structure, a bypassing device, a filtering cavity and a plurality of capillary tubes, wherein
the sticky capillary structure is disposed on an inner wall of the spiral channel; one end of the spiral channel is connected to a second air-out orifice, while the other end of the spiral channel is connected to one end of the bypassing device; the other end of the bypassing device is connected to the bottom of the filtering cavity by means of the plurality of capillary tubes; and the top of the filtering cavity is connected to the air-out passage.
Further, the first haze removing module further comprises a nozzle; and the first cavity has a first air-in orifice connected to the air-in passage and a first air-out orifice connected to the nozzle.
Further, the nozzle has one end smaller than the other end thereof in diameter, and the larger-diameter end of the nozzle is connected to the first air-out orifice.
Further, the second haze removing module comprises that: the second cavity has a second air-in orifice and a second air-out orifice that are disposed in two ends of the second cavity, respectively, with the second air-in orifice being connected to the smaller-diameter end of the nozzle.
Further, the air-in side and the air-out side of the first channel have a first flare angle and a second flare angle, respectively, with the first flare angle being greater than the second flare angle.
Further, a sieve is coated with a sticky substance that is oil, water or other materials which are sticky.
Further, the filtering part is formed by two layers of sieves disposed parallel to the length direction of the second cavity.
Further, a ratio of a distance between the two layers of sieves to a width of the second cavity ranges from 0.125 to 0.3125.
Further, an air-in plate that diverts airflow to the anterior diversion part is disposed at the second air-in orifice, and an air-out plate that diverts airflow coming out of the posterior diversion part into the second air-out orifice is disposed at the second air-out orifice.
Further, a plurality of spoiler units are disposed in the spiral channel.
Further, the filtering cavity holds at the bottom thereof a filtering liquid that is optionally water, oil or a sticky liquid substance.
Further, the sticky capillary structure is composed of a capillary structure including a fiber linear or sintered structure, and a sticky liquid that is water, oil or a sticky liquid substance.
Further, the spoiler unit is a triangle prism disposed perpendicular to an airflow direction, with edges of the triangle prism directly facing incoming airflow.
Further, the deodorizing module comprises an activated charcoal filtering means that is disposed in the middle of the air-in passage, and a catalytic means and a UV sterilizing means that are disposed at a rear section of the air-in passage.
Further, the catalytic means and the UV sterilizing means are combined into a partition plate.
Further, the air-in end of the body is provided with a fresh air orifice and a return air orifice, and a check valve is disposed for each of the fresh air orifice and the return air orifice.
Further, the indoor fresh air apparatus further comprises a monitoring device for air quality
that is disposed at the air-in end of the body.
Further, the indoor fresh air apparatus further comprises a plurality of monitoring devices for pressure difference that are disposed at the air-in end and the air-out end of the body, respectively.
The air treatment unit based on integrated treatment of outdoor fresh air and indoor return air provided by the present invention is capable of not only completely recovering cold energy or heat energy of indoor air, but also effectively treating indoor and outdoor PM2.5 and harmful gases such as formaldehyde and Volatile Organic Compounds (VOCs).

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a structural schematic diagram of the present invention;

FIG. 2 is a schematic diagram of a first flare angle and a second flare angle of the present invention;

FIG. 3 is a cross-sectional structural schematic diagram of a spiral channel of the present invention;

FIG. 4 is a schematic diagram of an operating principle of a first haze removing module of the present invention;

FIG. 5 is a schematic diagram of an operating principle of a second haze removing module of the present invention; and

FIG. 6 is a schematic diagram of an operating principle of the spiral channel of the present invention.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS

The present invention will be further explained in conjunction with the accompanying drawings and embodiments.
As shown in FIG. 1, an indoor fresh air apparatus comprises a body 7, an elementary filtering means 1, a deodorizing module 3, a blowing-in machine 4, a monitoring device for air quality 5, a monitoring device for pressure difference 6, a first haze removing module 8, a second haze removing module 9 and a third haze removing module 10. The body 7 is provided with an air-in passage 73 having one end serving as an air-in end and an air-out passage 74 having one end serving as an air-out end; the elementary filtering means 1 is disposed at the air-in end; the deodorizing module 3 is mounted in the air-in passage 73; the blowing-in machine 4 is mounted at the air-out end; and the air-in passage 73, the first haze removing module 8, the second haze removing module 9, the third haze removing module 10 and the air-out passage 74 are connected in order. The elementary filtering means 1 mainly serves to prevent mosquitoes and large particles such as dust from going into the apparatus and protect the deodorizing module. The deodorizing module 3 mainly serves to effectively remove volatile gases such as Volatile Organic Compounds (VOCs), formaldehyde and other odorous gases from fresh air and indoor return air. The blowing-in machine 4 is mainly used to feed the treated air to a target room.
The air-in end of the body 7 is provided with a fresh air orifice 71 and a return air orifice 72, and a check valve 2 is disposed for each of the fresh air orifice 71 and the return air orifice 72 to mainly prevent cross channeling of fresh air and return air and backflow of air.
The deodorizing module 3 comprises an activated charcoal filtering means 31 that is disposed in the middle of the air-in passage 73, and a catalytic means 32 and a UV sterilizing means 33 that are disposed at a rear section of the air-in passage 73 and combined into a partition plate. The activated charcoal filtering means 31 causes harmful gases such as formaldehyde, benzene and ammonia and part of bacteria in air to be adsorbed by means of super adsorbability of microscopic pores in carbon granules, thus achieving the effect of effectively cleaning air. The catalytic means 32 comprises a major component titanium dioxide that is a nano metal oxide material having an intensively catalytic degradation function under the action of light. The UV sterilizing means 33 achieves the effect of sterilization and disinfection mainly by destructing the molecular structure of DNA (desoxyribonucleic acid) or RNA (Ribonucleic Acid) in bacterial virus to cause death of growing cells and (or) regenerative cells. As a result, microorganisms such as germs and bacteria in ozone and air can be effectively removed. The catalytic means 32 is combined with the UV sterilizing means 33 into a photocatalytic sterilizing module. The photocatalytic sterilizing module undergoes strong redox reaction in photoelectric conversion, during which a catalytic agent absorbs photons under the action of a UV lamp, and electron transition occurs such that electrons (e-) and hole electrons (h+) are generated. Valence band holes having a strong oxidation property and conduction band electrons having a strong reducing property may directly react with reactants, and may also react with other electron donors and acceptors adsorbed on the catalytic agent. For example, holes may oxidize H₂O, while electrons reduce O₂in air, thereby generating H₂O₂, .OH groups and HO₂. These groups are all strong oxidative and thus can effectively oxidize organic pollutants, such that the organic pollutants are finally decomposed into inorganic small molecules such as carbon dioxide, H₂O and halide ions, thereby achieving the purpose of eliminating Volatile Organic Compounds (VOCs).
The monitoring device for air quality 5 is disposed at the air-in end, and comprises at least two of a smoke sensor, a dust sensor, a volatile gas sensor, a carbon monoxide gas sensor and a carbon dioxide gas sensor. The monitoring device for air quality is mainly used to monitor air quality conditions about PM2.5 and harmful gases such as formaldehyde and Volatile Organic Compounds (VOCs) at the air-in end so as to monitor indoor and outdoor air quality in real time.
The monitoring devices for pressure difference 6 are disposed at the air-in end and the air-out end of the body 7, respectively, and mainly used to detect a pressure difference between an inlet and an outlet for the modules and determine whether the filtering means are blocked or not according to the pressure difference so as to remind a user of timely replacement and cleaning.
The fresh air orifice 71 and the return air orifice 72 are disposed in the same air chamber of the body 7. By mixing indoor return air with fresh air, 100% heat exchange effect is basically achieved.
As shown in FIG. 1 and FIG. 3, the first haze removing module 8 comprises: a first cavity 81, a plurality of spray units 82, a plurality of ultrasonic units 83 and a nozzle 84. The first cavity 81 has a first air-in orifice 811 connected to the air-in passage 73 and a first air-out orifice 812 connected to the nozzle 84; the nozzle 84 has one end smaller than the other end thereof in diameter, and the larger-diameter end of the nozzle 84 is connected to the first air-out orifice 812; the spray units 82 are disposed in the first cavity 81, and the ultrasonic units 83 are disposed on two opposite sides of the inner wall of the first cavity 81. The spray units 82 produce water spray scattered in the first cavity 81. The ultrasonic units 83 perform ultrasonic vibrating treatment on the water spray and haze particles in the first cavity 81. The sprayed water particles may have a diameter of 0.5-5 microns, and the haze particles have a diameter of about 2.5 microns. The haze particles collide and combine with water vapor, and will have increased mass and certain stickiness after being wetted. Then, the wetted haze particles collide and bond with each other in the ultrasonic vibrating process to form larger particles that will go into the second haze removing module 9 after being accelerated by the nozzle 84.
As shown in FIG. 1, FIG. 2 and FIG. 4, the second haze removing module 9 comprises: a second cavity 91, a plurality of diversion parts 92, a filtering part 93 and a plurality of fans 94. The second cavity 91 has a second air-in orifice 911 and a second air-out orifice 912 that are disposed in two ends of the second cavity 91, respectively, and the second air-in orifice 911 is connected to the smaller-diameter end of the nozzle 84. The filtering part 93 is disposed along a center line in a length direction of the second cavity 91, and formed by two layers of sieves 931 disposed parallel to the length direction of the second cavity 91. The sieve 931 may be an existing sieve having good filtration performance. The sieve 931 is of a removable structure, which is convenient to replace. The sieve 931 is coated with a sticky substance that may be oil, water or other materials which are sticky. A certain distance is present between the two layers of sieves 931, and has a ratio to a width of the second cavity 91 ranges from 0.125 to 0.3125. A too small distance may cause reduction in an airflow passing rate, thereby influencing the ventilation efficiency, and a too large distance may result in occupation of more space; therefore, if the diversion parts 92 may not be arranged well, turbulent flow may be massively produced to influence the diversion effect. The diversion part 92 comprises a first diversion plate 921, a second diversion plate 922 and a third diversion plate 923 that define a first channel 924 together with a sidewall of the second cavity 91. The second diversion plate 922 forms a side, opposite to the sidewall of the second cavity 91, of the first channel 924. The second diversion plate 922 is of a similarly U-shaped bend structure, and bend angles of the second diversion plate 922 may be rounded so as to reduce airflow impacting; as a result, noise may be reduced. The first diversion plate 921 has one end connected to the sidewall of the second cavity 91 and is disposed at an air-in side 9241 of the first channel 924, and the third diversion plate 923 has one end connected to the sidewall of the second cavity 91 and is disposed at an air-out side 9242 of the first channel 924. The air-in side 9241 and the air-out side 9242 of the first channel 924 have a first flare angle 9243 and a second flare angle, respectively, and the first flare angle 9243 is greater than the second flare angle 9244. The large flare angle of the air-in side 9241 may ensure admission of airflow, and may also allow airflow at the air-out side 9242 having the smaller flare angle to be accelerated to a certain extent. Two adjacent diversion parts 92 are disposed at two opposite sides of the second cavity 91 and the air-out side 9242 of the anterior diversion part 92 corresponds to the air-in side 9241 of the posterior diversion part 92. The fans 94 are disposed at a side, opposite to the first channels 924, of the second cavity 91, and arranged corresponding to the air-in sides 9241 of the first channels 924. An air-in plate 95 that diverts airflow to the anterior diversion part 92 is disposed at the second air-in orifice 911, and an air-out plate 96 that diverts airflow coming out of the posterior diversion part 92 into the second air-out orifice 912 is disposed at the second air-out orifice 912. Haze particles treated by the first haze removing module 8 are led into the second haze removing module 9, and then guided by the diversion parts 92 to repetitiously pass through the two layers of sieves 931 comprising a sticky material. The two layers of sieves 931 disposed in parallel may define a filtering area. Part of turbulent flow may be produced as airflow is blocked when passing through the sieves 931, and part of turbulent flow may also be produced as airflow from the fans 94 meets haze particle airflow; therefore, the motion trajectories of haze particles at the incoming air side of and within the filtering area are disordered. Compared with single filtration that airflow passes through two layers of sieves 931 once, haze particles contact with the sieves 931 many times as airflow passes therethrough once by the way of the present invention with greatly increased odds of the haze particles being stuck on the sieves 931. The fans 94 ensure that haze airflow can go into the first channels 924 rapidly on one hand; and on the other hand, and a small range of turbulent flow may be produced as the airflow from the fans 94 meets the haze airflow, thus increasing the odds of haze particles contacting with the sieves 931; moreover, the haze particles may be prevented from staying in gaps outside the first channels 924.
As shown in FIG. 1, FIG. 2 and FIG. 5, the third haze removing module 10 comprises a spiral channel 101, a sticky capillary structure 102, a plurality of spoiler units 103, a bypassing device 104, a filtering cavity 105 and a plurality of capillary tubes 106. The sticky capillary structure 102 is disposed on an inner wall of the spiral channel 101, and composed of a capillary structure and a sticky liquid. The capillary structure may be a fiber linear or sintered structure, and the sticky liquid may be water, oil or a sticky liquid substance. The spoiler units 103 are disposed in the spiral channel 101, each of which is a triangle prism disposed perpendicular to an airflow direction and has edges thereof directly facing incoming airflow to cause airflow to tend to move towards the wall of the spiral channel 101. One end of the spiral channel 101 is connected to the second air-out orifice 912 of the second haze removing module 9, while the other end of the spiral channel 101 is connected to one end of the bypassing device 104; the other end of the bypassing device 104 is connected to the bottom of the filtering cavity 105 by means of the plurality of capillary tubes 106; the filtering cavity 105 holds at the bottom thereof a filtering liquid that may be water, oil or a sticky liquid substance; and the top of the filtering cavity 105 is connected to the air-out passage 74 of the body 7. The spiral channel 101 may increase the time of haze particles staying in the channel without occupying much space, and the sticky capillary structure 102 and the spoiler units 103 disposed within the spiral channel 101 further filter out the haze particles. Then, the treated airflow goes into the capillary tubes 106 from the bypassing device, and goes into the filtering cavity 105 to be filtered for the last time. By using the capillary tubes 106, airflow may be divided into a plurality of tiny flows for entering the filtering cavity 105 to produce micro-bubbles. The filtering liquid in the filtering cavity 105 may not flow backwards; moreover, the micro-bubbles have a very small size and disperse slowly in the filtering liquid, and haze particles have seldom been left after the previous treatments; thus, haze particles in micro-bubbles may be well filtered out in the filtering liquid.
According to the present invention, microprocessing modules and sensors are disposed in the fresh air apparatus, such that the air quality condition throughout the interior space can be detected through air circulation; moreover, comprehensive air pollution treatment may also be automatically enabled according to determination of monitoring data. The air treatment unit based on integrated treatment of outdoor fresh air and indoor return air provided by the present invention completely recovers cold energy or heat energy of indoor air; the haze removing modules efficiently filter out PM2.5 in air through primary aggregation and secondary filtration; and the deodorizing module may effectively treat harmful gases such as formaldehyde and Volatile Organic Compounds (VOCs). The indoor fresh air apparatus has the advantages of low ventilation resistance and high comprehensive cleaning capability, conforms to the architectural characteristics and requirements of real estate housing, apartments and villas, and meets the treatment requirements on healthy air quality of indoor environment; in addition, the simple ventilation function is extended to the level of healthy and energy-saving ventilation.

Claims

What is claimed is:

1. An indoor fresh air apparatus, comprising a body (7), an elementary filtering means (1), a deodorizing module (3), and a blowing-in machine (4), said body (7) being provided with an air-in passage (73) and an air-out passage (74), said air-in passage (73) having one end serving as an air-in end, said air-out passage (74) having one end serving as an air-out end, said elementary filtering means (1) disposed at said air-in end, said deodorizing module (3) disposed within said air-in passage (73), said blowing-in machine (4) disposed at said air-out end, said indoor fresh air apparatus characterized by further comprising a first haze removing module (8), a second haze removing module (9) and a third haze removing module (10);

said air-in passage (73), said first haze removing module (8), said second haze removing module (9), said third haze removing module (10) and said air-out passage (74) being connected in order,

said first haze removing module (8) comprising a first cavity (81), a plurality of spray units (82) disposed within said first cavity (81), and a plurality of ultrasonic units (83) disposed on two opposite sides of an inner wall of said first cavity (81);

said second haze removing module (9) comprising a second cavity (91), a plurality of diversion parts (92), a filtering part (93) and a plurality of fans (94), said filtering part (93) being disposed along a center line in a length direction of said second cavity (91); each of said diversion part (92) comprising a first diversion plate (921), a second diversion plate (922) and a third diversion plate (923) so as to define a first channel (924) together with a sidewall of said second cavity (91);

said second diversion plate (922) forming a side, which opposite to said sidewall of said second cavity (91), of said first channel (924);

said first diversion plate (921) having one end connected to said sidewall of said second cavity (91) and being disposed at an air-in side (9241) of said first channel (924),

said third diversion plate (923) having one end connected to said sidewall of said second cavity (91) and being disposed at an air-out side (9242) of said first channel (924);

two adjacent said diversion parts (92) consisting of a anterior diversion part (92) and a posterior diversion part (92) being disposed at two opposite sides of said second cavity (91), said air-out side (9242) of said anterior diversion part (92) corresponding to said air-in side (9241) of said posterior diversion part (92);

said fans (94) being disposed at a side, which opposite to said first channels (924), of said second cavity (91), and being arranged corresponding to said air-in sides (9241) of said first channels (924);

said third haze removing module (10) comprising a spiral channel (101), a sticky capillary structure (102), a bypassing device (104), a filtering cavity (105) and a plurality of capillary tubes (106);

said sticky capillary structure (102) being disposed on an inner wall of said spiral channel (101); one end of said spiral channel (101) being connected to a second air-out orifice (912), while the other end of said spiral channel (101) being connected to one end of said bypassing device (104); the other end of said bypassing device (104) being connected to the bottom of said filtering cavity (105) by means of said plurality of capillary tubes (106); and the top of said filtering cavity (105) being connected to said air-out passage (74).

2. The indoor fresh air apparatus according to claim 1, wherein, said first haze removing module (8) further comprising a nozzle (84);

said first cavity (81) having a first air-in orifice (811) connected to said air-in passage (73), and a first air-out orifice (812) connected to said nozzle (84).

3. The indoor fresh air apparatus according to claim 2, wherein, said nozzle (84) has one end smaller than the other end thereof in diameter, and the larger-diameter end of said nozzle (84) being connected to said first air-out orifice (812).

4. The indoor fresh air apparatus according to claim 3, wherein, said second cavity (91) has a second air-in orifice (911) and a second air-out orifice (912) that being respectively disposed in two ends of said second cavity (91); said second air-in orifice (911) being connected to the smaller-diameter end of said nozzle (84).

5. The indoor fresh air apparatus according to claim 1, wherein, said air-in side (9241) and said air-out side (9242) of said first channel (924) respectively having a first flare angle (9243) and a second flare angle (9244), said first flare angle (9243) being greater than said second flare angle (9244).

6. The indoor fresh air apparatus according to claim 1, wherein, said filtering part (93) being formed by two layers of sieves (931) disposed parallel to said length direction of said second cavity (91).

7. The indoor fresh air apparatus according to claim 6, wherein, said sieve (931) being coated with a sticky substance that being selected from the group consisting of oil, water and other materials which being sticky.

8. The indoor fresh air apparatus according to claim 7, wherein, a ratio of a is distance between said two layers of sieves (931) to a width of said second cavity (91) ranging from 0.125 to 0.3125.

9. The indoor fresh air apparatus according to claim 1, further comprising an air-in plate (95), being disposed at said second air-in orifice (911), for diverting airflow to said anterior diversion part (92); and

an air-out plate (96), being disposed at said second air-out orifice (912), for diverting airflow coming out of said posterior diversion part (92) into said second air-out orifice (912).

10. The indoor fresh air apparatus according to claim 1, further comprising a plurality of spoiler units (103) which being disposed in said spiral channel (101).

11. The indoor fresh air apparatus according to claim 10, wherein, each said spoiler unit (103) being a triangle prism disposed perpendicular to an airflow direction, with edges of said triangle prism directly facing incoming airflow.

12. The indoor fresh air apparatus according to claim 1, wherein, said filtering cavity (105) holding at said bottom thereof a filtering liquid that being optionally water, oil or a sticky liquid substance.

13. The indoor fresh air apparatus according to claim 1, wherein, said sticky capillary structure (102) being composed of a capillary structure including a fiber linear or sintered structure, and a sticky liquid that being water, oil or a sticky liquid substance.

14. The indoor fresh air apparatus according to claim 1, wherein, said deodorizing module (3) comprising an activated charcoal filtering means (31) that being disposed in said middle of said air-in passage (73), a catalytic means (32), and a UV sterilizing means (33) that being disposed at a rear section of said air-in passage (73).

15. The indoor fresh air apparatus according to claim 14, wherein, said catalytic means (32) and said UV sterilizing means (33) being combined into a partition plate.

16. The indoor fresh air apparatus according to claim 1, wherein, said air-in end of said body (7) being provided with a fresh air orifice (71) and a return air orifice (72), each of said fresh air orifice (71) and said return air orifice (72) being further provided with a check valve (2).

17. The indoor fresh air apparatus according to claim 1, further comprising a monitoring device for air quality (5) that being disposed at said air-in end of said body (7).

18. The indoor fresh air apparatus according to claim 1, further comprising a plurality of monitoring devices for pressure difference (6) that being disposed at said air-in end and said air-out end of said body (7), respectively.