JP2528790Y2 - Heat exchange type ventilation fan - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a heat exchange type ventilation fan that draws heat after exchanging heat between indoor air and outdoor air, and more specifically relates to the above-described indoor air and outdoor air. The present invention relates to a heat exchange type ventilation fan that performs heat exchange by directly mixing.

(Prior art)

FIG. 5 shows a state in which a conventional heat exchange type ventilation fan 1 'is mounted on a wall. The heat exchange type ventilation fan 1 'has an indoor suction air passage 19 and a room for blowing indoor air (intake direction is indicated by a solid wide arrow) through a casing 24 and a casing 25 in a case body 14'. The inside air passage 20 and the outdoor outside air passage 17 and the outdoor outside air passage 18 for blowing outdoor air whose suction direction is indicated by a dashed wide arrow are separately sealable. A single motor 2 is fixedly provided in the joint portion of the casing 24 and the casing 25, and a centrifugal fan 4 for blowing indoor air or a centrifugal fan 5 for blowing outdoor air is provided at both ends of a drive shaft of the motor 2. Has been established. Orthogonal heat exchangers 21 are arranged at the suction side end of the indoor side suction air passage 19 and the blowout side end of the outdoor side blowout air passage 18, that is, at a position where the blowing direction is orthogonal to the respective air passages. I have. Such a heat exchange type ventilation fan 1 'is attached to a predetermined installation hole of the wall 26, and the room and the outside are communicated through the heat exchange type ventilation fan 1'. As shown in FIG. 6, the orthogonal heat exchanger 21 has a heat transfer plate 22 made of a metal such as aluminum and a corrugated spacer 23 fixed in alternate layers. In this case, the spacers 23 are alternately arranged so that their waving directions are orthogonal to each other in the upper and lower layers, and the heat transfer plate 22 forms ventilation paths for outdoor air and indoor air alternately orthogonally. I have. The interval per one ventilation path is about 2 to 3 mm in the vertical direction.

Accordingly, in the heat exchange type ventilation fan 1 ', the centrifugal fan 5 sucks the outdoor air from the outdoor suction air passage 17 through the suction port 11' by the rotational drive of the motor 2, and the outdoor air blow air passage 18
Then, the air is sent into the room from the air outlet 10 through the orthogonal heat exchanger 21. On the other hand, the centrifugal fan 4 sucks the room air from the suction port 9 through the orthogonal heat exchanger 21 and the room-side suction air passage 19, and exhausts the room air through the room-side blowing air passage 20 and the air outlet 12 '. At this time, the indoor air and the outdoor air are respectively subjected to heat exchange in the orthogonal heat exchanger 21 so that the outdoor air is brought close to the temperature state of the indoor air and taken in so as not to change the state of the indoor air as much as possible. Has become.

However, the conventional heat exchange type ventilation fan 1 'as described above.
In this case, the air passage for outdoor air and the air passage for room air for independently blowing the outdoor air and the indoor air must be separately formed. Furthermore, orthogonal heat exchangers 21 must be installed at the ends of the respective air passages. For this reason, there is a problem that the structure of the heat exchange type ventilation fan 1 'is complicated and the manufacturing cost is high.

The heat exchange type ventilation fan 1 'may have good ventilation capacity and heat exchange capacity at the beginning of operation, but both of these capacities decrease with time. That is, the orthogonal heat exchanger 21 of the heat exchange type ventilation fan 1 'is easily clogged especially by dust and the like in the indoor air, and as a result, the above-mentioned respective capabilities are reduced. In particular,
Since the ventilation capacity, which can be said to be the main function of the ventilation fan, that is, the air blowing capacity is reduced, periodic maintenance is required, for example, once every several months. Further, the initial heat exchange efficiency of the orthogonal heat exchanger 21 is, for example, 50 to 70%, but the heat exchange efficiency decreases with time due to the above-described clogging and dirt.

As a ventilation fan capable of preventing a decrease in heat exchange efficiency due to clogging of the heat exchanger as described above, for example, Japanese Patent Laid-Open No.
An air blower disclosed in Japanese Patent Application Laid-Open Publication No. H10-209686 is known. This device is
An indoor air intake port, an outside air supply passage, a discharge port into the room, an exhaust passage outside the room, and an impeller are provided in the box, and the air from the outside and the room air are mixed inside the box while the room is mixed. This is a blower that has a mechanism that blows air to the room and circulates indoor air, and also provides a mechanism for ventilating the room by exhausting a part of the air sucked into the impeller to the outside with a single impeller. Since the heat exchange is performed by directly contacting with the heat exchanger, it is excellent in that there is a possibility of clogging or the like in the heat exchanger.

[Problems to be solved by the invention]

However, the apparatus disclosed in Japanese Patent Application Laid-Open No. 55-75593 lacks a means for positively mixing the outdoor air and the indoor air by simply blowing the air into the box body, and is therefore satisfactory in terms of heat exchange efficiency. It was not something to be done.

Therefore, the purpose of the present invention is to make the above-mentioned indoor air and outdoor air come into direct contact with each other and to mix both airs as uniformly as possible, thereby improving the heat exchange efficiency. It is to provide a heat exchange type ventilation fan which can be improved.

In addition, when mixing two gases such as indoor air and outdoor air, a round bar or a bar having a triangular cross section that promotes agitation of both gases is often provided in a path of both gases. 58-5
No. 3226 discloses a round bar or a bar having a triangular cross section that is convex toward the upstream side of the flow. However, in such cases, the mixing of both gases is sufficient,
The round bar or the triangular bar becomes unnecessarily resistant to the flow of gas, causing a decrease in flow rate and a decrease in flow velocity.

Therefore, another object of the present invention is to provide a heat exchange type ventilator having a mechanism that not only sufficiently mixes indoor air and outdoor air but also has low resistance to flow.

[Means for solving the problem]

In order to achieve the above object, the main means adopted by the present invention are, as its gist, a fin for outdoor air blowing attached to the indoor side surface of the wall and facing the indoor side surface of the wall, Indoor fan that is driven by a single drive source and that is driven by a single drive source, and that is drawn into the room by the indoor air blowing fin of the fan from the indoor air suction opening that opens toward the room. And the fins for outdoor air blowing make direct contact with the outdoor air sucked from the outdoor air suction opening opened toward the outside to exchange heat, and the air after the heat exchange is blown to the air outlet facing the indoor side and the outdoor side. In the heat exchange type ventilation fan configured to distribute and discharge the air from the exhaust portion facing the inside and the outside of the room, the fins for the indoor air blowing and the fins for the outdoor air blowing are used. The indoor air and the outdoor air blown in parallel to each other are blown into an air mixing chamber having a plurality of flow dividing members having a mountain-shaped cross section that is convex toward the upstream direction of the air flow, and the indoor air and the outdoor air are blown by the flow dividing members. This is a heat exchange type ventilation fan according to the point that air is diverted in the direction of the air blow port on the indoor side and in the direction of the exhaust section on the outdoor side so that both airs come into direct contact.

[Action]

According to the heat exchange type ventilation fan according to the present invention, the indoor air and the outdoor air sent by the fan enter the air mixing chamber,
The liquid is directly mixed by colliding with the mixing protrusion provided in the mixing chamber,
At this time, heat exchange is performed directly between the two. Then, the mixture of the mixed indoor air and outdoor air is directed to both indoor and outdoor by the mixture distribution means,
For example, they are distributed at a predetermined ratio. Thereby, air containing fresh outdoor air is taken into the room, and air including room air is exhausted outside the room. In this case, the indoor air and the outdoor air collide with the mixing projection and are sufficiently mixed by being stirred, so that the heat exchange efficiency is improved.

Further, in the present invention, a plurality of flow dividing members having a mountain-shaped cross section which is convex toward the upstream direction of the air flow are provided in the mixing chamber, and the indoor air and the outdoor air blown by the fan are blown into the indoor side by the flow dividing members. The air is diverted in the direction of the air outlet and in the direction of the exhaust portion on the outdoor side, whereby both airs come into direct contact with each other, and good heat exchange is achieved. At the same time, the diverting member has a mountain-shaped cross section that is convex toward the upstream direction of the air flow, so that the resistance to the air flow is small, and as a result, the resistance to the air flow is not large. The heat exchange efficiency can be increased by effectively mixing the air.

〔Example〕

Next, embodiments of the present invention will be described with reference to the accompanying drawings to facilitate understanding of the present invention.
Note that the following embodiments are merely specific examples of the present invention, and do not limit the technical scope of the present invention.

Here, FIG. 1 is a right side sectional view showing a heat exchange type ventilation fan according to one embodiment of the present invention, FIG. 2 is an external view of the heat exchange type ventilation fan viewed from obliquely front, and FIG. FIG. 4 is a schematic diagram showing a modified example of the ventilation fan, and FIG. 4 is a schematic diagram showing another modified example of the heat exchange type ventilation fan.

In the following description, the same elements as those of the conventional heat exchange type ventilation fan 1 'shown in FIG.

As shown in FIG. 1 and FIG. 2, the heat exchange type ventilation fan 1 according to the present embodiment has an outer shell formed by a front panel 13 and a case main body 14, and is attached to the indoor side of a wall 26. panel
The upper portion 13 has an upper opening formed with a suction port 9 for taking in indoor air into the machine, and a lower opening formed with an opening 10 for blowing air containing outdoor air into the room. In the outer shell, a casing 15 and a chassis 16 that constitute a ventilation path for guiding indoor air and outdoor air are provided, and a portion of the casing 15 and the chassis 16 corresponding to the suction port 9 is formed to be open. ing. The chassis 16 is fixed inside the case body 14 so as to form an outdoor-side suction air passage 17 between the chassis 16 and the rear surface of the case body 14.

The lower part of the back of the case body 14 communicates between the room and the outside through a through-hole in the wall 26, and allows the outdoor air to flow into the outdoor suction air passage.
A suction pipe 11 to be taken into 17 is provided so as to protrude toward the outdoor. An exhaust pipe 12 for exhausting a part of the mixture of the indoor air and the outdoor air to the outside of the chamber 16 is fixedly provided coaxially with the suction pipe 11 in the suction pipe 11 below the chassis 16. .

Further, a motor 2 having a horizontal axis and serving as a single driving source is provided at a position corresponding to the suction port 9 of the chassis 16. A centrifugal fan 3 is provided on the drive shaft of the motor 2.
The centrifugal fan 3 is a fin for blowing indoor air.
This is a double-sided suction fan that is formed separately on the fins 3a and the fins 3b for blowing outdoor air, and the indoor air suction side and the outdoor air suction side are partitioned by a partition plate 3c.

A mixing chamber 6 is provided below the centrifugal fan 3, that is, in the blower-side air passage, for directly mixing the indoor air and the outdoor air supplied by the centrifugal fan 3. The mixing chamber 6 is provided with a plurality of flow dividing members 7 having a substantially triangular cross section for causing the respective airs to collide with each other to stir and sufficiently mix the air.

This heat exchange type ventilation fan exchanges heat by direct contact between outdoor air and indoor air.However, in a structure where the resistance of fluid generated at the time of heat exchange becomes large, heat exchange efficiency is achieved by direct contact with the air. The enhanced meaning disappears.

In the ventilation fan shown in FIG. 1, room air taken in from a suction port 9 opening to the indoor side is blown into the mixing chamber 6 by indoor air blowing fins 3a facing the indoor side, and further returns air to the room. The air outlet 10 is open to the indoor side. In addition, the outdoor air taken in from the outdoor air suction port 10 opening to the outdoor side is used for outdoor air blowing fins 3b facing the outdoor side.
An exhaust pipe 12 that is blown into the mixing chamber 6 and returns air to the outside of the room is open to the outside of the room. Therefore, if there is no mixing means in the mixing chamber, the room air is sent from the suction port 9 through the fan 3 to the blower port 10 as it is, and the outdoor air passes from the suction pipe 11 through the fan 3 to the exhaust pipe 12 as it is.
And the contact between the indoor air and the outdoor air hardly occurs. This is because indoor air and outdoor air simply flow in parallel in the ventilation fan and do not intersect. In this case, the heat exchange efficiency is significantly reduced.

The flow dividing member 7 provided in the mixing chamber in this embodiment
Are a plurality of flow dividing members having a mountain-shaped cross section that are convex toward the upstream direction of the air flow, and the indoor air and the outdoor air blown into the mixing chamber 6 by the fan 3 by the respective flow dividing members are blown into the indoor side by the air outlet. By being diverted in the direction of 10 and the direction of the exhaust pipe 12 on the outdoor side, both airs come into direct contact with each other one after another downstream of the plurality of diverting members 7, thereby achieving good heat exchange. Furthermore, since the flow dividing member has a mountain-shaped cross section that is convex toward the upstream direction of the air flow, the resistance to the air flow is small, and as a result, the resistance to the air flow is not large. The heat exchange efficiency can be increased by effectively mixing the air. The number or intervals of the flow dividing members 7 may be appropriately set according to the required heat exchange capacity or ventilation capacity. However, it is preferable to adopt a structure in which dirt and the like are hardly attached and deposited.

Below the mixing chamber 6, there is provided a distribution plate 8 having a bifurcated side cross section for distributing the air-fuel mixture from the mixing chamber 6 at a predetermined ratio toward both the inside and the outside of the room. 16 and is extended toward the exhaust pipe connection portion.
Is formed. For example, when giving priority to the ventilation function of indoor air, the predetermined ratio is set such that the cross-sectional area of the outdoor air passage 18 is wider than that of the indoor air passage 20 so that each air passage is cut off. What is necessary is just to set by the ratio of area.

Therefore, when the heat exchange type ventilation fan 1 starts, the motor 2 is driven to rotate, and the centrifugal fan 3 starts blowing. Then, the outdoor air is taken in from the opening of the suction pipe 11,
The air is guided to the centrifugal fan 3 through the outdoor-side suction air passage 17, and is blown out toward the mixing chamber 6 from the fin 3 b side of the centrifugal fan 3. On the other hand, room air is drawn into the inside of the device from the suction port 9 of the panel 13, and is sent toward the mixing chamber 6 from the fin 3 a side of the centrifugal fan 3. Then, the indoor air and the outdoor air sent from the centrifugal fan 3 are directly stirred and mixed by the flow dividing member 7 in the mixing chamber 6. As described above, since the flow dividing member 7 has a mountain-shaped cross section that is convex toward the upstream direction of the air flow, the indoor air and the outdoor air blown into the mixing chamber 6 by the fan 3 by the respective flow dividing members 7 are formed. Ventilation port 10 on the indoor side
And the separated air collide with each other in the direction of the exhaust pipe 12 on the outdoor side, and the two air directly contact each other one after another downstream of the plurality of flow dividing members 7 to achieve good heat exchange. You. At this time, since the flow dividing member 7 has a mountain-shaped cross section that is convex toward the upstream direction of the air flow, the resistance to the air flow is small, and as a result, the resistance to the air flow is not large. The indoor air and the outdoor air can be effectively mixed to increase the heat exchange efficiency. Subsequently, a part of the air-fuel mixture from the mixing chamber 6 is exhausted to the outside of the room by the distribution plate 8 (air-fuel mixture distribution means) through the outdoor-side blowing air passage 18 and the exhaust pipe 12, and the remainder is indoor-side blowing air passage. The air is blown into the room through 20 and the air outlet 10.

As described above, the heat exchange type ventilation fan 1 according to the present embodiment
When exhausting indoor air to the outside while performing heat exchange and taking in the outdoor air into the room, it is not necessary to individually configure the respective ventilation paths. Then, the flow dividing member 7 in the mixing chamber 6 realizes a sufficient heat exchange function by stirring and mixing the indoor air and the outdoor air.

As described above, the apparatus according to the present embodiment can reduce the manufacturing cost because the configuration is simple, and the mixing projection 7 is unlikely to be clogged due to dirt or the like. Performance degradation is reduced, and maintenance is not required for a long period of time.

Further, since the heat exchange function is based on direct heat exchange between the indoor air and the outdoor air, there is almost no deterioration in performance due to adopting a heat exchanger structure having a small ventilation resistance to avoid clogging and the like.

In addition, the part where the indoor air and the outdoor air or the air-fuel mixture and the outdoor air come into contact with each other through a tube wall, for example, the partition plate 3c, the exhaust panel 12, the chassis 16 and the like of the centrifugal fan 3 are made of aluminum or the like having good heat conductivity. If used, the heat exchange function of the device is further enhanced.

Furthermore, since the large ventilation resistance unlike the case where the orthogonal heat exchanger 21 is employed is eliminated, even when the same air volume is obtained, the rotation speed of the centrifugal fan 3 can be reduced,
Silent design can be performed.

In the above-described embodiment, the indoor air is sucked in from the front of the main body, and the front side of the air-fuel mixture with the outdoor air is blown into the room, and the outdoor air is sucked into the machine from the rear of the main body and the back of the air-fuel mixture with the indoor air. Although the side is configured to be discharged into the room, the ventilation efficiency can be improved in consideration of the drift of each air in the mixing chamber 6. Such a heat exchange type ventilation fan 1a is shown in the schematic diagram of FIG. In this heat exchange type ventilation fan 1a, the air-fuel mixture on the back side is blown out toward the room and the air-fuel mixture on the front side is discharged toward the outside of the room,
A distribution plate 8a branched in a cross shape is employed as the mixture distribution means. Therefore, a predetermined ventilation function can be realized even when the indoor air or the outdoor air causes a drift in the mixing chamber 6.

Further, in the above-described embodiment, the double suction type centrifugal fan 3 is provided at one end of the drive shaft of the single motor 2. However, the present invention is not limited to this, and as shown in the schematic diagram of FIG. For example, the drive shaft of the motor 2 may be used as both shafts, and axial fans 27 and 28 may be provided at the ends of the drive shaft.

[Effect of the invention]

The present invention, as described above, is attached to the indoor side surface of the wall, and includes a fin for outdoor air blowing opposed to the indoor side surface of the wall and a fin for indoor air blowing opposed to the indoor side. A room driven by a drive source, and the room air sucked from the room air suction port opened toward the room by the room air blowing fins of the fan;
The above-mentioned outdoor air blowing fins directly contact the outdoor air sucked from the outside air suction port opened toward the outside to exchange heat, and the air after the heat exchange is opposed to the air outlet facing the indoor side and the air outlet facing the outdoor side. In the heat exchange type ventilation fan configured to distribute and discharge the air toward the room and the outside from the exhaust unit, the indoor air and the outdoor air blown in parallel by the indoor air blowing fins and the outdoor air blowing fins, respectively. Is blown into an air mixing chamber provided with a plurality of flow dividing members having a mountain-shaped cross section that is convex toward the upstream direction of the air flow, and the indoor air and the outdoor air are blown by the flow dividing member into the air outlet direction on the indoor side and the outdoor side. The heat exchange type ventilation fan is characterized in that the two airs come into direct contact with each other by diverting in the direction of the exhaust section, so that sufficient heat exchange between the indoor air and the outdoor air is achieved. It is possible to provide a heat exchange type ventilation fan which has a function and does not generate resistance to air flow by a fan provided in the heat exchange type ventilation fan, and therefore does not reduce the flow rate and flow velocity of air blown into a room. It is.

[Brief description of the drawings]

FIG. 1 is a right side sectional view showing a heat exchange type ventilation fan according to one embodiment of the present invention, FIG. 2 is an external view of the heat exchange type ventilation fan viewed obliquely from the front, and FIG. Schematic diagram showing a modified example, FIG. 4 is a schematic diagram showing another modified example of the heat exchange type ventilation fan, FIG. 5 is a left sectional view showing a conventional heat exchange type ventilation fan which is an example of the background of the present invention, FIG. 6 is an external view showing an orthogonal heat exchanger provided in the heat exchange type ventilation fan of FIG. [Explanation of symbols] 1,1a, 1b, 1 ': heat exchange type ventilation fan 2: motor, 3: centrifugal fan 6: mixing chamber, 7: flow dividing member 8, 8a: distribution plate, 9 ... … Suction port 10 …… Blow-out port, 11 …… Suction pipe 12 …… Exhaust pipe

Claims (1)

(57) [Scope of request for utility model registration] An indoor air blowing fin mounted on a room side surface of a wall and facing the indoor side surface of the wall, and a room air blowing fin facing the room side and driven by a single drive source. Indoor air sucked from the indoor air suction port opened toward the room by the indoor air blowing fins of the fan, and outside air suction opened toward the outdoor by the outdoor air blowing fins. Direct contact with outdoor air sucked from the mouth and heat exchange,
In the heat exchange type ventilation fan configured to distribute and discharge the air after the heat exchange from the blower port facing the indoor side and the exhaust part facing the outdoor side toward the room and the outside, respectively, the indoor air blower fin and the outdoor The indoor air and the outdoor air blown in parallel by the air blowing fins are blown into an air mixing chamber including a plurality of flow dividing members having a mountain-shaped cross section that is convex toward the upstream direction of the air flow, A heat-exchange type ventilation fan characterized in that indoor air and outdoor air are separated by a member in a direction toward a blower port on the indoor side and a direction toward an exhaust unit on the outdoor side so that the two airs are in direct contact with each other.