JPH0145001Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a structural improvement of an energy-saving type air conditioning ventilation fan that exchanges heat between outdoor air and indoor air and then sucks the outdoor air into the room.

<Prior Art> As this type of air conditioning ventilation fan, there is a so-called built-in type fan as shown in FIG. 3, for example.

This air conditioning ventilation fan 1 is installed between the ceiling C on the first floor and the floor F on the second floor, and forms an indoor air exhaust passage 2 and an outdoor air intake passage 3 via a duct, with one end of each being placed outdoors. The other end is branched and opens into each of the plurality of chambers, one at a time. And the indoor air exhaust passage 2
and an exhaust fan 4 in each of the outdoor air intake passages 3.
and an intake fan 5 are arranged, and both the fans 4, 5
A heat exchanger 6 is installed at the intersection of both passages 2 and 3 on the outdoor side.
is installed.

Such an air conditioning ventilation fan 1 turns on exhaust and intake fans 4 and 5 to generate airflow in both passages 2 and 3, thereby guiding indoor air to the outdoors and outdoor air to the indoor room. It removes pollutants such as CO, CO ₂ , dust, and moisture from indoor air, and at the same time, during heating operation, fresh outdoor air is exchanged with the exhausted indoor air to be used as relatively warm air that is later returned indoors. It is something that is discharged to.

<Problems to be solved by the invention> By the way, when this type of air conditioning ventilation fan 1 is used in winter in particularly cold regions, due to the temperature difference between indoor air and outdoor air, a heat exchanger through which indoor air on the high temperature side flows Condensation occurs on the inner wall of the indoor air exhaust passage 2 at No. 6. If this condensed water is not drained outside immediately,
The attached dew condensation water becomes frost, resulting in a decrease in heat exchange efficiency due to an increase in the amount of frost formation, and a decrease in ventilation performance due to a decrease in the flow area of the heat exchanger 6.

For this reason, as in the conventional device described above, the condensed water is discharged outside while being exposed to the exhaust flow.
It is preferable to use exhaust heat and condensation heat to prevent condensed water from freezing.

However, if the exhaust fan 4 is disposed at the outdoor end of the indoor air exhaust passage 2, that is, on the downstream side of the exhaust from the heat exchanger 6, the waste water will be blown away from the open end of the exhaust passage 2. As shown in the figure, the exhaust fan 4 has to be installed at the indoor end of the indoor air exhaust passage 2, that is, on the upstream side (indoor side) of the heat exchanger 6. , the intake fan 5 will also be arranged on the indoor side. For this reason,
It is necessary to take measures to suppress as much as possible the noise propagating into the room from the exhaust fan 4 and intake fan 5 (the latter is particularly noisy because it discharges air into the room). If this is provided, the pressure loss will increase.

The present invention has been developed in view of the conventional situation, and is intended to take measures against fan noise by reducing fan noise without causing pressure loss to improve the soundproofing effect.

<Means for Solving the Problems> For this reason, the present invention includes a heat exchanger for exchanging heat between indoor air and outdoor air on the outdoor side from the intake and exhaust fans, and a heat exchanger that exchanges heat between indoor air and outdoor air on the indoor side from both the fans A circulation passage that intersects the indoor air exhaust passage and the outdoor air intake passage, a circulation air fan disposed in the circulation passage, air circulating in the circulation passage, and indoor air and outdoor air circulating in both passages. and a heat exchanger for indirectly exchanging heat.

<Function> As a result, heat exchange between indoor air and outdoor air is performed by the heat exchanger placed outside both fans, while heat exchanger placed indoors from both fans exchanges heat into the room. This effectively reduces the noise propagating into the fan's room while increasing the intake air temperature.

<Example> Hereinafter, an example of the present invention will be described in detail based on FIGS. 1 and 2. Note that the same reference numerals are given to the same components as in the conventional example to simplify the explanation.

In the air conditioning ventilation fan 11 shown in FIG. 1, an exhaust fan 4 and an intake fan 5 are disposed in the indoor air exhaust passage 2 and the outdoor air intake passage 3, respectively, and both the passages 2 and 3 are provided on the outdoor side from the fans 4 and 5. The structure in which the heat exchanger 6 is disposed at the intersection of is the same as the conventional one.

Further, on the indoor side of the exhaust fan 4 and the intake fan 5, air flowing through a circulation passage 7 intersecting with both passages 2 and 3 and an indoor air exhaust passage 2 are provided.
A heat exchanger 8A that exchanges heat with the indoor air flowing through the inside, and a heat exchanger 8B that exchanges heat between the air flowing through the circulation passage 7 and the outdoor air flowing through the outdoor air intake passage 3 are integrated. A heat exchange unit 8 is provided.

In addition, 9 is a circulating air fan disposed in the circulation passage 7, which actively circulates the air in the ceiling to the heat exchangers 8A and 8.
Blow air to B. Further, the inlet 7 of the circulation passage 7
A opens directly below the floor F, and a discharge port 7b opens directly above the ceiling C.

During normal ventilation operation, the air conditioning ventilation fan 11 with such a configuration maintains the exhaust fan 4, the intake fan 5, and the circulating air fan 9 in the ON state, and supplies air into the indoor air exhaust passage 2, the outdoor air intake passage 3, and the circulation passage 7. The so-called ventilation operation is continued by generating airflow in each case. Therefore, in this case, indoor air passes through the indoor air exhaust passage 2, passes through the heat exchanger 8A, exhaust fan 4, and heat exchanger 6 in order and is exhausted to the outdoors, and outdoor air passes through the outdoor air suction passage 3 and passes through the heat exchanger 8A, and the heat exchanger 6. 6. The air passes through the intake fan 5 and the heat exchanger 8B in this order, exchanging heat with the indoor air at the heat exchanger 6, and exchanging heat with the air in the ceiling at the heat exchanger 8B, before being discharged into the room. On the other hand, the air in the ceiling flowing through the circulation passage 7 passes through the circulation air fan 9 and then passes through the heat exchanger 8.
A and 8B, the air exchanges heat with the indoor air in the indoor air exhaust passage 2 and the outdoor air in the outdoor air suction passage 3, and is then discharged into the ceiling.

At this time, the noise generated by the exhaust and intake fans 4 and 5 and transmitted into the room is largely insulated by the heat exchangers 8A and 8B, which are placed closer to the room than the fans 4 and 5. It can reduce noise and increase the noise prevention effect.

In addition, since the air flowing through the heat exchangers 8A and 8B on the indoor side is the air in the ceiling, especially when used in winter in cold regions, the heat in the ceiling that is kept at a relatively high temperature is wasted. By being available, the outdoor air, which has been heated by exchanging heat with the indoor air in the heat exchanger 6, can be further heated by exchanging heat with the heat exchanger 8B, thereby further increasing the temperature of the supply air supplied indoors. This makes it difficult to feel cold air indoors, and the temperature of the piping forming the suction passage 3 is also increased, making it possible to prevent piping condensation as much as possible.

It goes without saying that even if the circulating air fan 9 is turned off, the noise prevention effect of the exhaust and intake fans 4 and 5 can be sufficiently obtained.

In addition, the material of the heat exchanger of each of the heat exchangers 6, 8A, and 8B is, for example, the heat exchanger 6, which exchanges heat between indoor air and outdoor air, is made of synthetic resin that is resistant to dew condensation. If the heat exchangers 8A and 8B, through which heat is exchanged between indoor air and outdoor air, are made of washi paper, which has excellent sound absorption properties, both fans 4 and 5 that transmit heat into the room
It is clear that the soundproofing effect of

FIG. 2 shows different embodiments of the indoor heat exchange section, which includes a heat exchanger 18A on the indoor air discharge passage 2 side of the heat exchange unit 18 and a heat exchanger 18B on the outdoor air intake passage 3 side. A circulating air fan 19 is provided between the circulating air fan 19 and the circulating air fan 19. In this way, the transmission of noise caused by the circulating air fan 19 can be prevented not only on the air outlet side but also on the inlet side by the two heat exchangers 18A and 18B. Can be effectively blocked.

<Effects of the invention> As explained above, according to the invention, air is transferred from the exhaust and intake fan to the indoor air exhaust passage and the outdoor air intake passage on the indoor side, and exchanges heat with the indoor and outdoor air flowing through both passages. The heat exchanger has a heat exchanger and a circulation passageway through which the air flows, further raising the supply air temperature while insulating the noise transmitted into the room due to the operation of the intake and exhaust fans, thereby increasing the noise prevention effect. It can be improved very well.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram showing one embodiment of an air conditioning ventilation fan according to the present invention, FIG. 2 is a configuration diagram of main parts of a different embodiment, and FIG. 3 is a configuration diagram showing a conventional example of an air conditioning ventilation fan. 2...Indoor air exhaust passage, 3...Outdoor air intake passage, 4...Exhaust fan, 5...Intake fan, 6
...Heat exchanger, 7...Circulation passage, 8A, 8B, 1
8A, 18B... Heat exchanger, 9, 19... Circulating air fan.

Claims (1)

[Scope of utility model registration request] An outdoor air intake passage and an indoor air exhaust passage, intake and exhaust fans disposed in each of these passages, and indoor air which is disposed on the outdoor side of each fan and circulates through both passages when the respective fans are driven. In an air-conditioning ventilation fan equipped with a heat exchanger that indirectly exchanges heat between air and outdoor air, an air conditioning fan that intersects with the outdoor air intake passage and the indoor air exhaust passage towards the indoor side from the intake and exhaust fan in the indoor air intake passage and the indoor air exhaust passage. A circulation passageway, a circulation air fan disposed in the circulation passageway, and a heat exchanger for indirectly exchanging heat between the circulation air flowing through the circulation air fan and indoor air and outdoor air flowing through both passages. An air conditioning ventilation fan characterized by having a container and.