JP2555814B2 - Variable air supply type air purification system - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a variable air supply type air cleaning system, and more particularly, to increase or decrease the number of revolutions of a fan of an air purifier based on a dust concentration detected by an indoor dust concentration detection sensor. The present invention relates to a variable air supply type air purifying system.

[0002]

2. Description of the Related Art An air purifying system of this kind is generally described in, for example, Japanese Patent Publication No. 1-50821. In the structure, as shown in FIG. 2, a total heat exchanger 102 that heat-exchanges the air in the room 100 and the air in the outdoors 101 to ventilate the air, and an air cleaner 103 that cleans the air in the room 100 are provided. ing.

[0003] The total heat exchanger 102 includes an exhaust fan 107 for discharging the air in the room 100 sucked from the duct 104 through the heat exchange element 105 to the outside 101 through the duct 106, and a heat exchange element from the duct 108. There is provided a suction fan 110 that supplies the air of the outside 101 sucked through the 105 to the room 100 through the duct 109.

[0004] The air purifier 103 includes a suction duct 111 for sucking air in the room 100 and an outlet duct 112 for circulating purified air into the room 100. Further, inside the air purifier 103, a fan 113, a dust collecting element 114 for purifying air, and an indoor dust concentration detection sensor 115 for detecting a dust concentration of air in the room 100 are arranged. The indoor dust concentration detection sensor 115 is the control unit 1
16 and an indoor dust concentration detection sensor 115
The control unit 116 is configured to increase or decrease the rotation speed of the fan 113 based on the detected dust concentration.

[0005]

However, in the air cleaning system having the above structure, the total heat exchanger 102 and the air purifier 1 are not required.
03 function independently of each other, and when the dust concentration in the room 100 increases, only by increasing the rotation speed of the fan 113 of the air purifier 103, the room 10
0 air was clean. Therefore, when the amount of dust generated in the room 100 is large due to smoking or the like, the supply air volume of the total heat exchanger 102 does not increase in synchronization with the supply air volume of the air purifier 103 even if the rotation speed of the fan 113 is increased. Room 10
There was a problem that the ventilation of the air was not sufficient and the dust removal efficiency was low.

Further, in the above-described cleaning system, since the total heat exchanger 102 and the air purifier 103 are independent of each other, in addition to the suction duct 111 and the blow-off duct 112 of the air purifier 103, the total heat exchanger 102 duct 104,
Since the duct 109 is configured to open into the room 100, not only is the appearance impaired, but also the construction cost required for piping becomes high.

The invention according to claim 1 has been made in view of the above problems, and provides a variable air supply type air cleaning system having high dust removal efficiency, easy piping and construction, and not spoiling the appearance. Is intended. Further, in the air cleaning system described with reference to FIG. 2, the air in the room 100 could not be effectively ventilated even if the carbon dioxide concentration in the room 100 was high, so the air in the room 100 contaminated by carbon dioxide was cleaned. There was a problem that I could not do it.

The invention according to claim 2 has been made in view of the above problems, and in addition to the object of the invention according to claim 1, when the carbon dioxide concentration in the room 100 becomes high,
An object of the present invention is to provide a variable air supply amount air cleaning system that can effectively clean the air in the room 100.

[0009]

In order to solve the above problems, the variable air supply amount type air cleaning system according to the first aspect of the present invention uses a heat exchange process to ventilate indoor air and outdoor air. A heat exchanger and an air purifier for purifying indoor air are provided, and the total heat exchanger is connected to an air supply duct through which heat-treated outdoor air flows, and the air purifier is A fan, a dust collecting element for air cleaning, an indoor dust concentration detection sensor for detecting the dust concentration of indoor air,
In a variable air supply amount air cleaning system including a control unit that increases or decreases the rotation speed of the fan based on the dust concentration detected by the indoor dust concentration detection sensor, in the air purifier, the air supply duct A communication passage communicating with the downstream end, a first air passage communicating the communication passage with the downstream side of the dust collecting element, and a second air passage communicating the communication passage with the upstream side of the dust collecting element. An outdoor dust concentration detection sensor for detecting the dust concentration of the air from the outdoor is provided between the outdoor or the first air passage and the outdoor air introduction port of the total heat exchanger. When the dust concentration of the air detected by the detection sensor is less than or equal to the threshold value, the second air passage is closed and the communication passage is connected to the first air passage, and is larger than the threshold value. Place The communication passage with closing the first air passage is characterized in that a switching means in communication with said second air passage.

Further, in addition to the constituent features of the invention described in claim 1, the supply air amount variable type air cleaning system according to claim 2 of the present invention further includes a dioxide for detecting the carbon dioxide concentration of the indoor air in the control section. While the carbon detection sensor is connected, this control unit increases the rotation speed of the fan when the carbon dioxide concentration of the indoor air is equal to or higher than the threshold value.

[0011]

According to the structure of claim 1, the air from the outside after heat exchange that passes through the air supply duct of the total heat exchanger is connected to the communication passage of the air purifier and the first air passage or the second air passage. Since it is supplied to the room through the air passage, if the rotation speed of the fan of the air cleaner increases or decreases according to the dust concentration in the room, the outdoor air passing through the air supply duct will also be sucked in according to the rotation speed of this fan. As a result, the supply air volumes of the air purifier and the total heat exchanger increase / decrease in synchronization. Therefore, clean air from the outside can be supplied to the room above the rated value without changing the rotation speed of the fan of the total heat exchanger, and the ventilation of the room is promoted. Further, when the dust concentration of the outdoor air is equal to or lower than the threshold value, the communication passage and the first air passage are communicated with each other by the switching means, so that the air from the outdoors passing through the total heat exchanger is subjected to the heat exchange treatment. After that, it is immediately supplied to the room from the first air passage through the downstream side of the dust collecting element of the air cleaner. On the other hand, when the dust concentration of the outdoor air is higher than the above threshold value, the communication passage and the second air passage are communicated by the switching means, so that the air from the outdoors passing through the total heat exchanger exchanges heat. After being treated, it is cleaned from the second air passage through the dust collecting element and then supplied to the room.

Further, according to the total heat exchanger of the cleaning system of the second aspect, in addition to the above action, when the carbon dioxide concentration of the air in the room detected by the carbon dioxide detection sensor is equal to or more than a preset value. Since the control unit increases the rotation speed of the fan, the fan also increases the amount of air supplied from the outside through the total heat exchanger, which promotes ventilation in the room, resulting in a rapid reduction in carbon dioxide concentration. .

[0013]

Embodiments will be described in detail below with reference to the accompanying drawings showing embodiments. As shown in FIG. 1 which is a schematic plan view of one embodiment of the present invention, a total heat exchanger 13 for ventilating the inside of a room 11 and the outside 12 by heat exchange processing is provided in a ceiling space 10.
And an air purifier 14 for purifying the air in the room 11.

The total heat exchanger 13 has a heat exchange element 15 inside.
It has. The heat exchange element 15 includes an exhaust passage 16 and
An air supply channel 17 is provided, and the air that has passed through one channel and the air that has passed through the other channel are configured to exchange heat with the heat exchange element 15. Air chambers 18 to 21 are formed on the upstream side and the downstream side of the two flow paths 16 and 17, respectively. The air chambers 19 and 21 on the downstream side of the flow paths 16 and 17 are provided with exhaust fans 22, The air supply fans 23 are arranged respectively. Exhaust passage 16
The air chamber 18 on the upstream side is connected to a duct 25 that penetrates the ceiling plate 24 and opens to the room 11, and the air chamber 19 on the downstream side opens through the wall 26 to the outside 12. Duct 27 is connected. On the other hand, a duct 28 penetrating the wall 26 and opening to the outside 12 is connected to the air chamber 20 on the upstream side of the air supply passage 17, and an air supply duct 29 is connected to the air chamber 21 on the downstream side. Is connected.

The air purifier 14 is provided with a suction duct 30 for sucking the air in the room 11 and a blowout duct 31 for returning the cleaned air to the room 11. Further, a fan 32 for air supply is disposed inside the air purifier 14 between the suction duct 30 and the blow duct 31,
On the upstream side of the fan 32, a dust collection filter 3 for purifying air is provided.
3 is arranged, and a pre-filter 34 is arranged on the upstream side of the dust collecting filter 33. Further pre-filter 3
4, the room 1 sucked from the suction duct 30 on the upstream side.
The indoor dust concentration detection sensor 35 for detecting the dust concentration of the air of No. 1 is arranged.
5 is electrically connected to a control unit 36 for changing and controlling the rotation speed of the fan 32. The control unit 36 includes a microcomputer and other electrical components,
When the indoor dust concentration exceeds the threshold value, the rotation speed of the fan 32 can be increased / decreased in three steps, for example.

With the above-mentioned structure, in the embodiment shown in FIG. 1, the dust collecting element 3 is provided inside the air cleaner 14.
A first air passage 37 that communicates with the downstream side of No. 3 and a second air passage 38 that communicates with the upstream side of the prefilter 34, that is, the upstream side of the dust collection element 33. The upstream sides of both air passages 37, 38 communicate with the downstream end of the air supply duct 29 of the total heat exchanger 13 via a communication passage 39 formed inside the air purifier 14. Further, a switching damper 40 is disposed between the air passages 37 and 38, and the switching damper 40 is electrically connected to the control unit 36, and the air passages 37 and 38 are selected together with the control unit 36. The switching means is configured to be closed once. An outdoor dust concentration detection sensor 41 is arranged in the communication passage 39, and the sensor 41 is electrically connected to the control unit 36. When the detection value of the outdoor dust concentration detection sensor 41 is less than or equal to the threshold value by controlling the switching damper 40 by the control unit 36, the second air passage 3
8 is closed and the communication passage 39 and the first air passage 37 are made to communicate with each other. When the threshold value is larger than the threshold value, the first air passage 37 is closed and the communication passage 39 and the second air passage are It is constituted so that 38 may be open for free passage.

Inside the air purifier 14, the suction duct 3
A carbon dioxide concentration detection sensor 42 for detecting the carbon dioxide concentration of the indoor air passing through 0 is arranged.
2 is also electrically connected to the control unit 36. Further, inside the air purifier 14, throttle dampers 43 for adjusting the opening degree of the suction duct 30 are arranged in pairs, and the throttle dampers 43 are arranged in pairs.
By controlling by the control unit 36 based on the detected value of 2, the opening degree of the suction duct 30 can be changed to a fully open state or a half open state to change the air circulation amount.

The control unit 36 is electrically connected to the fans 22 and 23 of the total heat exchanger 13, and the fans 22 and 23 operate in synchronization when the power of the air purifier 14 is turned on. Is configured.

Next, the operation will be described. According to the above structure,
When the exhaust fan 22 of the total heat exchanger 13 operates, the air in the room 11 is sucked into the air chamber 18 from the duct 25, passes through the exhaust flow path 16 of the heat exchange element 15, and further flows into the air chamber 19. , And is discharged to the outside 12 through the duct 27. When the air supply fan 23 of the total heat exchanger 13 is operated, the air in the outdoor 12 is sucked from the duct 28 into the air chamber 20, and the air supply passage 17 of the heat exchange element 15 is provided.
And further flows through the duct 29 via the air chamber 21. Then, the air from the room 11 and the air from the outdoor 12 pass through the flow paths 16 and 17 of the heat exchange element 15, respectively, so that the heat of the air is exchanged.

On the other hand, in the air purifier 14, the air in the room 11 sucked from the suction duct 30 by the fan 32 is removed by the pre-filter 34 and the dust collecting filter 33, and is returned to the room 11 through the blow-out duct 31. And air purifier 1
4, the indoor dust concentration detection sensor 35 arranged inside
When the dust concentration higher than the threshold value is detected, the control unit 36 increases the rotation speed of the fan 32 based on the detected value to increase the air flow rate and improve the dust removal capability.

When the number of rotations of the fan 32 increases, the air in the outside 12 supplied from the air supply duct 29 also passes through the communication passage 39.
Since it is supplied to the inside of the air purifier 14 through the air purifier 14, the clean air of the outdoor 12 passing through the total heat exchanger 13 increases in synchronism with the air purifier 14, and the air flows through the air purifier 14 to the interior of the room. By being actively supplied to 11
Ventilation of 1 is promoted. When the dust concentration of the air in the room 11 falls below the threshold value, the control unit 36 reduces the rotation speed of the fan 32, so that the air supply amount of the air cleaner 14 is reduced and the total heat exchanger 13 The supply amount of the air is also reduced in synchronization with the air purifier 14.

In the above operation, when the dust concentration detected by the outdoor dust concentration detection sensor 41 is less than or equal to the threshold value, the control unit 36 controls the switching damper 40 to close the second air passage 38. As a result, the air sucked from the outdoor 12 by the total heat exchanger 13 passes from the air supply duct 29, the communication passage 39, the first air passage 37, and the fan 32.
Is directly distributed to the room 11 through the outlet duct 31. Therefore, clean air that has been heat-exchanged by the total heat exchanger 13 is supplied to the room 11, so that ventilation of the room 11 is promoted and dust removal efficiency is also improved. Further, the loss of dust removal amount per unit time is reduced.

On the other hand, when the dust concentration detected by the outdoor dust concentration detection sensor 41 is higher than the threshold value, the control unit 36
Controls the switching damper 40 to close the first air passage 37. As a result, the total heat exchanger 13 causes the outdoor 12
The air sucked from the air passes through the air supply duct 29 and the communication passage 39 through the second air passage 38 to the upstream side of the pre-filter 34 first, and then the dust collecting filter 33 removes dust, and then the blow-out duct 31. Is supplied to the room 11.
Therefore, the air that has undergone heat exchange in the total heat exchanger 13 is supplied after being dedusted, so that the air having a high dust concentration is not supplied to the room 11 and the dust removal efficiency is not reduced. Absent.

In the above operation, when the carbon dioxide concentration detection sensor 42 detects a carbon dioxide concentration higher than the threshold value, the control unit 36 increases the rotation speed of the fan 32 regardless of the indoor dust concentration value. As a result, the amount of air from the outside 12 supplied from the air supply duct 29 of the total heat exchanger 13 increases, so that ventilation of the room 11 is promoted and the carbon dioxide concentration is rapidly reduced. Further, in this embodiment, when the value of the dust concentration in the room is high in the state where the carbon dioxide concentration is high, only one of the pair of diaphragm dampers 43 is opened to the half-opened state, and the inside of the room 11 where the carbon dioxide concentration is high The air is set to be discharged to the outside 12 more efficiently. Here, the reason why the throttle damper 43 is not fully closed is that the air in the room 11 is cleaned to some extent by cleaning the room 1
This is to prevent the dust concentration of the first air from increasing. The above-mentioned operations are summarized in Table 1.

[0025]

[Table 1]

In implementing the present invention, the outdoor dust concentration detection sensor 41 is installed in the outdoor 12 or the total heat exchanger 13.
It may be arranged in the air chamber 20. Further, each fan 22, 23 of the total heat exchanger 13 may be configured to operate independently of the fan 32 of the air purifier 14. Further, it is needless to say that an air purifier of the type in which the fan 32 is arranged on the upstream side of the dust collecting element 33 may be adopted, and other various design changes are allowed within the scope of the claims.

[0027]

As described above, according to the variable supply air purifying system according to the first aspect of the present invention, the air from the outside after heat exchange through the air supply duct of the total heat exchanger is an air purifier. Is supplied to the room through the first air passage or the second air passage from the communication passage of No. 1, so that when the rotation speed of the fan increases or decreases according to the dust concentration in the room, the air passing through the air supply duct also becomes The air is sucked according to the number of revolutions, and the supply air volumes of the air purifier and the total heat exchanger increase and decrease synchronously. Therefore, clean air from the outside can be supplied to the room above the rated value without changing the rotation speed of the fan of the total heat exchanger, so that the ventilation of the room is promoted and the dust removal efficiency is improved. Also, since the air supply duct through which the heat-exchanged outdoor air flows is connected to the air purifier, heat loss is reduced.

Further, according to the supply amount variable air cleaning system of the present invention, when the dust concentration of the outdoor air is low, the outdoor air passing through the total heat exchanger is subjected to heat exchange treatment, Since it is immediately supplied into the room from the first air passage through the downstream side of the dust collecting element of the air purifier, the loss of dust removal amount per unit time is reduced. Further, when the dust concentration of the outdoor air is high, it is supplied to the room after being cleaned through the dust collecting element from the second air passage, so that the air having a high dust concentration is not discharged from the blowout duct. . Therefore, also from this point, the dust removal efficiency of the indoor air is promoted, and excellent air cleaning performance can be exhibited.

Further, according to the variable supply amount type air cleaning system of the present invention, since the air supply duct is connected to the communication passage of the air cleaner, the number of pipes opened in the room is equal to that of the air supply duct. It will decrease by the amount. Therefore, the appearance is improved and the construction cost required for piping is reduced. Further claim 2
According to the total heat exchanger of the described cleaning system, in addition to the above effects, when the carbon dioxide concentration in the room air is equal to or higher than the threshold value, the control unit increases the rotation speed of the fan, so the total heat exchange is performed by the fan. The amount of air supplied from the outside through the chamber is also increased, which promotes ventilation in the room and improves the air cleaning capacity.
Therefore, there is an advantage that air pollution due to carbon dioxide, which cannot be sufficiently cleaned by the conventional air cleaning system, can be effectively removed.

[Brief description of drawings]

FIG. 1 is a schematic plan view of an embodiment of the present invention.

FIG. 2 is a schematic side view showing a conventional structure.

[Explanation of symbols]

 11 Indoor 12 Outdoor 13 Total Heat Exchanger 14 Air Purifier 29 Air Supply Duct 32 Fan 33 Dust Collection Filter 35 Indoor Dust Concentration Detection Sensor 36 Control Section (Switching Means) 37 First Air Passage 38 Second Air Passage 39 Stations Passage 40 Switching damper (switching means) 41 Outdoor dust concentration detection sensor 42 Carbon dioxide concentration detection sensor

Claims (2)

(57) [Claims] 1. A total heat exchanger (13) for heat-exchanging the air in the room (11) and the air in the outdoors (12), and an air purifier (14) for cleaning the air in the room (11). ) And the total heat exchanger (1
The air supply duct (29) through which the air from the heat-treated outdoor (12) circulates is connected to 3), and the air cleaner (14) has a fan (32) and dust for air cleaning. Element (33) and indoor (1
Indoor dust concentration detection sensor that detects the dust concentration of air in 1)
(35) and a control unit (36) for increasing / decreasing the rotation speed of the fan (32) based on the dust concentration detected by the indoor dust concentration detection sensor (35). In the system, the air purifier (14) is provided with the air supply duct.
A communication passageway (39) communicating with the downstream end of the (29), a first air passageway (37) communicating the communication passageway (39) with the downstream side of the dust collecting element (33), and the communication passageway (39 ) To the above dust collection element (33)
And a second air passage (38) communicating with the upstream side of the air passage between the outdoor (12) or the first air passage (37) and the outdoor air inlet of the total heat exchanger (13). The outdoor dust concentration detection sensor (41) for detecting the dust concentration of the air in the outdoor (12) is provided, and when the dust concentration of air detected by the outdoor dust concentration detection sensor (41) is less than or equal to the threshold value. To the second
The air passageway (38) of the first air passageway and the communication passageway (39) communicates with the first air passageway (37), and closes the first air passageway (37) when larger than the threshold value. In addition, the supply air amount variable type air cleaning system is characterized in that switching means (36) (40) for connecting the communication passage (39) with the second air passage (38) is provided. 2. A carbon dioxide detection sensor (42) for detecting the carbon dioxide concentration of air in the room (11) is connected to the control section (36), and the control section (36) If the carbon dioxide concentration in the air in (11) is above the threshold value, the above fan
The air cleaning system according to claim 1, wherein the rotation speed of the (32) is increased.