HEAT EXCHANGER
A heat exchanger includes an apparatus body, a motor, an air-exhaust fan casing, an air-supply fan casing, heat exchanging devices, an air-supply air-flow path, and an air-exhaust air-flow path. A first stacking pitch of heat transfer plates in the heat exchanging devices placed at positions other than that immediately after an outdoor suction port in the air-supply air-flow path and at positions other than that immediately after a indoor suction port in the air-exhaust air-flow path is smaller than a second stacking pitch of heat transfer plates in the heat exchanging devices immediately after the outdoor suction port in the air-supply air-flow path and immediately after the indoor suction port in the air-exhaust air-flow path.
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The present invention relates to a heat exchanger for ventilating rooms.
BACKGROUND ARTAs illustrated in
On the outer peripheral portions of air-exhaust fan casing 109 and air-supply fan casing 110, there are placed heat exchanging devices 111. Air-supply air-flow path 112 extends from outdoor suction port 104 to indoor exhaust port 103, through air-supply air-flow path structural plate 115, heat exchanging devices 111, air-supply blade 107, and exhaust pipe 117. On the other hand, air-exhaust air-flow path 113 extends from indoor suction port 102 to outdoor exhaust port 105, through air-exhaust air-flow path structural plate 116, heat exchanging devices 111, air-exhaust blade 106, and exhaust pipe 117 (refer to PTL 1, for example).
Heat exchanging devices 111 perform heat exchanging between air passing through air-exhaust air-flow path 113 and air passing through air-supply air-flow path 112. Specifically, heat exchanging devices 111 recover heat in the indoor space being subjected to air conditioning, from the air passing through air-exhaust air-flow path 113, and, using this heat, cool (or heat) the outdoor air passing through air-supply air-flow path 112, before this outdoor air is supplied to the inside of the room.
In order to increase the heat exchanging efficiency in heat exchanging devices 111, within the limited volume of apparatus body 114, the pitch of heat transfer plates stacked therein should be made smaller, and the number of the heat transfer plates in the heat exchanging devices 111 within the volume of apparatus body 114 should be increased, for attaining larger amounts of heat exchanges therein. With such a conventional heat exchanger, if stacking pitch of the heat transfer plates in the heat exchanging devices is made smaller, and the number of the heat transfer plates therein is made larger, within the limited volume of the apparatus body, this will increase the ventilation resistance inside the heat exchanging devices. This will increase the resistances in the air-flow paths (the ventilation resistances) inside the apparatus body, thereby inducing the problem of insufficient amounts of ventilation.
Citation ListPatent Literature
PTL 1: Unexamined Japanese Patent Publication No. 2006-349223
SUMMARY OF THE INVENTIONThe present invention provides a heat exchanger including an apparatus body with a box shape which is provided, in its side surfaces, with an indoor suction port, an indoor exhaust port, an outdoor suction port, and an outdoor exhaust port; a motor on which an air-exhaust blade and an air-supply blade are mounted, at a center portion of the apparatus body; an air-exhaust fan casing provided outside the air-exhaust blade; an air-supply fan casing provided outside the air-supply blade; a plurality of heat exchanging devices which are placed on outer peripheral portions of the air-exhaust fan casing and the air-supply fan casing, each includes stacked heat transfer plates adapted to flow air streams of different temperatures along alternate ones of the heat transfer plates for exchanging heat; an air-supply air-flow path which extends from the outdoor suction port through the heat exchanging device and the air-supply blade and communicates with the indoor exhaust port; and an air-exhaust air-flow path which extends from the indoor suction port through the heat exchanging device and the air-exhaust blade and communicates with the outdoor exhaust port, wherein a first stacking pitch of the heat transfer plates in the heat exchanging devices placed at positions other than that immediately after the outdoor suction port in the air-supply air-flow path and at positions other than that immediately after the indoor suction port in the air-exhaust air-flow path is smaller than a second stacking pitch of the heat transfer plates in the heat exchanging devices immediately after the outdoor suction port in the air-supply air-flow path and immediately after the indoor suction port in the air-exhaust air-flow path.
As a result thereof, air inside the room and outdoor air are sucked through the indoor suction port and the outdoor suction port, respectively, and part of the sucked air flows through the insides of the heat exchanging devices including the heat transfer plates having the larger stacking pitch. Further, this air is sucked into the air-exhaust fan casing and the air-supply fan casing and, then, is discharged through the outdoor exhaust port and the indoor exhaust port. This prevents the ventilation resistance from being increased and, further, prevents the amount of ventilation from being insufficient.
Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.
First Exemplary EmbodimentIn heat exchanging devices 11, there are heat transfer plates 20 laminated therein, and warm air and cold air at different temperatures alternately flow therethrough, so that heat transfer plates 20 perform heat exchanges therebetween. Further, inside apparatus body 5, there are formed air-supply air-flow path 12 and air-exhaust air-flow path 13. In this case, air-supply air-flow path 12 extends from outdoor suction port 3 through heat exchanging devices 11 and air-supply blade 7 to indoor exhaust port 2. Air-exhaust air-flow path 13 extends from indoor suction port 1 through heat exchanging devices 11 and air-exhaust blade 6 to outdoor exhaust port 4.
The heat exchanger having the aforementioned structure will be described, in terms of operations thereof. If motor 8 is operated, this causes air-exhaust blade 6 and air-supply blade 7 to rotate. Outdoor air is sucked through outdoor suction port 3 in air-supply air-flow path 12, and the outdoor air flows around the bottom surface in
On the other hand, air inside the room is sucked through indoor suction port 1 in air-exhaust air-flow path 13, and the air inside the room flows around the top surface in
In this case, air inside the room and outdoor air are sucked, through indoor suction port 1 and outdoor suction port 3, respectively. Part of the sucked air flow inside heat exchanging devices 11a and lib including heat transfer plates 20 having second stacking pitch 15b defined as larger. Further, part of the sucked air is sucked into air-exhaust fan casing 9 and air-supply fan casing 10 and, further, is discharged, through outdoor exhaust port 4 and indoor exhaust port 2.
Heat exchanging devices immediately after outdoor suction port 3 in air-supply air-flow path 12 and immediately after indoor suction port 1 in air-exhaust air-flow path 13 are adjacent to outdoor exhaust port 4 and indoor exhaust port 2, respectively. Therefore, the areas of the air-flow paths are minimized, thereby maximizing the ventilation resistances therein. To cope therewith, in the heat exchanger according to the first exemplary embodiment of the present invention, second stacking pitch 15b of the heat transfer plates in heat exchanging devices 11a and 11b immediately after outdoor suction port 3 in air-supply air-flow path 12 and immediately after indoor suction port 1 of air-exhaust air-flow path 13 is locally made larger. As a result thereof, the ventilation resistances immediately after outdoor suction port 3 and immediately after indoor suction port 1 can be decreased, without largely degrading the heat exchanging efficiency.
Further, as illustrated in
Air inside the room and outdoor air is sucked through indoor suction port 1 and outdoor suction port 3, respectively, and part of the sucked air flows inside heat exchanging devices 11c including heat transfer plates 20 having third stacking pitch 15c defined as smaller. Further, part of the sucked air is sucked into air-exhaust fan casing 9 and air-supply fan casing 10 and is discharged, through outdoor exhaust port 4 and indoor exhaust port 2.
In the heat exchanger according to the first exemplary embodiment of the present invention, heat exchanging devices 11c are spaced apart from outdoor suction port 3 in air-supply air-flow path 12 and from indoor suction port 1 in air-exhaust air-flow path 13 and are positioned in the middle of the respective air-flow paths. Heat exchanging devices 11c are spaced apart from the minimum-distance air-flow path portions through which larger amounts of air flow from indoor suction port 1 toward air-exhaust fan casing 9 and from outdoor suction port 3 toward air-supply fan casing 10. Therefore, heat exchanging devices 11c are less influenced by pressure losses induced by air flows. Accordingly, even though third stacking pitch 15c of heat transfer plates 20 in heat exchanging devices 11c is locally made smaller, the ventilation resistance in apparatus body 5 is prevented from being significantly increased. Further, these heat exchanging devices 11c can attain larger amounts of heat exchanges than those by heat exchanging devices 11 placed immediately after outdoor suction port 3 and indoor suction port 1, thereby increasing the heat exchanging efficiency of the entire heat exchanger.
By doing this, with the plurality of heat exchanging devices 11 having different sizes 16 in the stacking direction of heat transfer plates 20, it is possible to clarify the positions at which heat exchanging devices 11 should be mounted, inside apparatus body 5, thereby preventing the occurrence of mistakes in mounting heat exchanging devices 11. This enables certainly mounting heat exchanging devices 11 during the fabrication of apparatus body 5 and, in addition thereto, enables improvement of the maintainability of heat exchanging devices 11 being used, during cleaning thereof, and the like.
By doing this, it is possible to adjust the heat exchanging efficiency and the ventilation resistance inside apparatus body 5, through heat exchanging devices 11 themselves, rather than through mixed placement of heat exchanging devices 11. Further, it is possible to mount heat exchanging devices 11 in apparatus body 5 without inducing mistakes. This enables certainly mounting heat exchanging devices 11 therein during the fabrication of apparatus body 5. Further, it is possible to improve the maintainability of heat exchanging devices 11 being used, during cleaning thereof, and the like.
Second Exemplary EmbodimentAs illustrated in
In the heat exchanger according to the second exemplary embodiment of the present invention, heat exchanging devices 11 and bypass air-flow paths 17 are placed such that they are mixed therein. As a result thereof, by adjusting the positions at which bypass air-flow paths 17 are placed, it is possible to adjust the heat exchanging efficiency of the heat exchanger and the ventilation resistance inside apparatus body 5.
By doing this, it is possible to realize a blower capable of supplying air and exhausting air at the same time, while maintaining the shape of apparatus body 5.
By doing this, it is possible to purify air to be supplied to the inside of the room, without providing an additional filter outside apparatus body 5.
As filters 18 mounted in bypass air-flow paths 17, it is possible to employ dust filters and deodorization filters.
Further, as filters 18 mounted in bypass air-flow paths 17, it is possible to employ acoustical materials, which can reduce ventilation noises inside apparatus body 5.
INDUSTRIAL APPLICABILITYIt is possible to reduce the ventilation resistance inside the apparatus body without largely degrading the heat exchanging efficiency and, therefore, the present invention can be applied to applications of blowing apparatuses and the like which include heat exchangers required to have reduced ventilation resistances in the apparatus bodies in such a way as to maintain the sizes of the apparatus bodies.
REFERENCE MARKS IN THE DRAWINGS
- 1 Indoor suction port
- 2 Indoor exhaust port
- 3 Outdoor suction port
- 4 Outdoor exhaust port
- 5 Apparatus body
- 6 Air-exhaust blade
- 7 Air-supply blade
- 8 Motor
- 9 Air-exhaust fan casing
- 10 Air-supply fan casing
- 11, 11a, 11b, and 11c Heat exchanging device
- 12 Air-supply air-flow path
- 13 Air-exhaust air-flow path
- 14 Exhaust pipe
- 15 Stacking pitch (of heat transfer plates)
- 15a First stacking pitch
- 15b Second stacking pitch
- 15c Third stacking pitch
- 16 Size in the stacking direction
- 17 Bypass air-flow path
- 18 Filter
- 20 Heat transfer plate
Claims
1. A heat exchanger comprising:
- an apparatus body with a box shape which is provided, in its side surfaces, with an indoor suction port, an indoor exhaust port, an outdoor suction port and an outdoor exhaust port;
- a motor on which an air-exhaust blade and an air-supply blade are mounted, at a center portion of the apparatus body;
- an air-exhaust fan casing provided outside the air-exhaust blade;
- an air-supply fan casing provided outside the air-supply blade;
- a plurality of heat exchanging devices which are placed on outer peripheral portions of the air-exhaust fan casing and the air-supply fan casing, each of the plurality of heat exchanging devices includes stacked heat transfer plates adapted to flow air streams of different temperatures along alternate ones of the stacked heat transfer plates for exchanging heat;
- an air-supply air-flow path which extends from the outdoor suction port through one or more of the heat exchanging devices and the air-supply blade and communicates with the indoor exhaust port; and
- an air-exhaust air-flow path which extends from the indoor suction port through one or more of the heat exchanging devices and the air-exhaust blade and communicates with the outdoor exhaust port,
- wherein a first stacking pitch of the heat transfer plates in the heat exchanging devices placed at positions other than that immediately after the outdoor suction port in the air-supply air-flow path and at positions other than that immediately after the indoor suction port in the air-exhaust air-flow path is smaller than a second stacking pitch of the heat transfer plates in the heat exchanging devices immediately after the outdoor suction port in the air-supply air-flow path and immediately after the indoor suction port in the air-exhaust air-flow path.
2. The heat exchanger according to claim 1, wherein
- the heat transfer plates in the heat exchanging devices which are positioned in the middle of the air-supply air-flow path and in the middle of the air-exhaust air-flow path have a third stacking pitch smaller than the first stacking pitch.
3. The heat exchanger according to claim 1, wherein
- the heat exchanging devices have different sizes in a stacking direction of the heat transfer plates.
4. The heat exchanger according to claim 1, wherein
- a mixture of different stacking pitches is provided in the plurality of heat exchanging devices placed on the outer peripheral portions of the air-exhaust fan casing and the air-supply fan casing.
5. The heat exchanger according to claim 1, wherein
- some of the heat exchanging devices placed on the outer peripheral portions of the air-exhaust fan casing and the air-supply fan casing are replaced with a bypass air-flow path communicating the outdoor suction port with the air-supply blade and a bypass air-flow path communicating the indoor suction port with the air-exhaust blade.
6. The heat exchanger according to claim 1, wherein
- all of the heat exchanging devices placed on the outer peripheral portions of the air-exhaust fan casing and the air-supply fan casing are replaced with a bypass air-flow path communicating the outdoor suction port with the air-supply blade and a bypass air-flow path communicating the indoor suction port with the air-exhaust blade.
7. The heat exchanger according to claim 5, wherein
- a filter is provided within the bypass air-flow paths for purifying air delivered to an indoor space.
8. The heat exchanger according to claim 7, wherein
- the filter comprises a dust filter.
9. The heat exchanger according to claim 7, wherein
- the filter comprises a deodorization filter.
10. The heat exchanger according to claim 5, wherein
- an acoustical material is provided within the bypass air-flow paths for reducing ventilation noises in the apparatus body.
11. The heat exchanger according to claim 6, wherein
- a filter is provided within the bypass air-flow paths for purifying air delivered to an indoor space.
12. The heat exchanger according to claim 11, wherein
- the filter comprises a dust filter.
13. The heat exchanger according to claim 11, wherein
- the filter comprises a deodorization filter.
14. The heat exchanger according to claim 6, wherein
- an acoustical material is provided within the bypass air-flow paths for reducing ventilation noises in the apparatus body.
15. A heat exchanger comprising:
- a box-shaped apparatus body including an indoor suction port, an indoor exhaust port, an outdoor suction port and an outdoor exhaust port on side surfaces thereof;
- a motor including an air-exhaust blade and an air-supply blade mounted thereon, the motor disposed at a center portion of the apparatus body;
- an air-exhaust fan casing provided outside the air-exhaust blade;
- an air-supply fan casing provided outside the air-supply blade;
- a plurality of bypass air-flow paths on outer peripheral portions of the air-exhaust fan casing and the air-supply fan casing, each of the plurality of bypass air-flow paths includes stacked heat transfer plates adapted to flow air streams of different temperatures along alternate ones of the stacked heat transfer plates for exchanging heat;
- an air-supply air-flow path which extends from the outdoor suction port through one or more of the heat exchanging devices and the air-supply blade and communicates with the indoor exhaust port; and
- an air-exhaust air-flow path which extends from the indoor suction port through one or more of the heat exchanging devices and the air-exhaust blade and communicates with the outdoor exhaust port,
- wherein a first stacking pitch of the heat transfer plates in the heat exchanging devices placed at positions other than that immediately after the outdoor suction port in the air-supply air-flow path and at positions other than that immediately after the indoor suction port in the air-exhaust air-flow path is smaller than a second stacking pitch of the heat transfer plates in the heat exchanging devices immediately after the outdoor suction port in the air-supply air-flow path and immediately after the indoor suction port in the air-exhaust air-flow path.
Type: Application
Filed: Sep 7, 2010
Publication Date: Jun 21, 2012
Applicant: PANASONIC CORPORATION (Osaka)
Inventors: Shinobu Orito (Aichi), Yoshihiko Takayama (Aichi), Toshihiko Hashimoto (Aichi), Takaaki Nakasone (Aichi)
Application Number: 13/393,868
International Classification: F28F 13/00 (20060101);