JPH085119A - Heat exchanger - Google Patents

Abstract

PURPOSE:To obtain a heat exchanger being connectable with a piping space of a duct. CONSTITUTION:A heat exchange plate unit 32 constructed by stacking a plurality of heat exchange plates having 6 tortoise-shell-shaped flat surfaces with some space between them is held in a box-shaped casing 20 and thereby a heat exchanger A is formed. Inside the unit 32, an air supply passage having inlet-outlet ports 39a and 39b and an exhaust passage having inlet-outlet ports 41a and 41b are formed in every other stage so that they cross each other. Divided parts of an air supply duct 15 are connected to a supply air inlet 24d on this right side of the casing 20 and to a supply air outlet 25b on the back left side thereof respectively, while divided parts of an exhaust duct 16 are connected to an exhaust inlet 24a on this left side and to an exhaust outlet 24c on the back right side respectively. Inside the heat exchanger A, supply air passing through the air supply duct 15 flows in the direction of an arrow (a) and exhaust passing through the exhaust duct 16 in the direction of an arrow (b), i.e., in opposite directions to each other, and heat exchange is made between the supply air and the exhaust in the meantime.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger suitable for being attached to an air conditioning system of a building such as a building.

[0002]

2. Description of the Related Art In an air conditioning system of a building such as a building, heat exchange is performed between air supply and exhaust so that the room can be well ventilated and the heating and cooling can be efficiently performed. A conventional air conditioning system that performs this type of heat exchange will be described with reference to FIG. In the heat exchanger 1 of this system, a heat exchange plate unit 2 in which a plurality of heat exchange plates are laminated at intervals is housed in a casing 3, and an air supply passage and an exhaust passage are alternately arranged in the unit 2. Are used, and orthogonal heat exchangers that allow supply air and exhaust air to flow in the directions perpendicular to each other are used, and are installed in the air conditioning machine room 4 side by side with the air conditioner 5.

The outside air introduced through the air supply duct 6 is introduced into the air supply passage of the unit 2 as shown by the solid arrow.
In addition, the air in the room is circulated in the exhaust passages at right angles to each other through the exhaust duct 7 as shown by the dashed arrows, and heat is exchanged therebetween, and the exhaust air after the heat exchange is exhausted to the outside through the exhaust duct 7. The heat-exchanged air is sent to the air conditioner 5 to be cooled or heated, and is supplied from the air supply duct 6 to the room for cooling or heating. That is, before the outside air is cooled or raised in temperature by the air conditioner 5, it is heat-exchanged with the exhaust gas from the room to be cooled or raised in advance so that the air is efficiently cooled or heated.

[0004]

By the way, the conventional heat exchanger 1 is designed to be used by being installed in the air conditioning machine room 4 as described above, and it is often necessary to install it in a narrow space. There is a limit to the size of the heat exchange plate unit 2 itself. Therefore, in order to secure the necessary heat exchange area under such conditions, the space between the heat exchange plates must be made as narrow as possible and a structure in which a large number of sheets are stacked has to be used.

If the distance between the heat exchange plates is narrow, there arises a problem that clogging easily occurs due to dust or the like mixed in during air supply and exhaust. Therefore, it is necessary to clean it frequently, but it is difficult to work because the space between the plates is narrow, and it takes time,
Moreover, the reality is that it cannot be cleaned sufficiently. For this reason, fine filters have been attached to prevent clogging, but the cost of the filter itself and the labor cost of inspecting and replacing the filter cause a great increase in cost. Further, the fact that a large number of heat exchange plates are laminated at narrow intervals increases the flow path resistance accordingly, so that it is necessary to separately provide a large fan 8 for supplying air or exhaust air. The cost will increase.

Further, the air supply and exhaust ducts 6 and 7 are connected to the heat exchanger 1.
When connecting to the air conditioner, it is necessary to pull down the middle of the air supply / exhaust ducts 6 and 7 to the floor side of the air conditioning machine room 4 where the heat exchanger 1 is connected, so that not only a large piping space is required but also construction work is required. However, as long as the heat exchanger 1 is installed and used in the air conditioning machine room 4, there is a drawback that it requires a great deal of cost for maintenance and installation.

Therefore, an object of the present invention is to provide a heat exchanger suitable for being attached to an air conditioning system of a building such as a building without requiring a special expense for maintenance and installation. In addition to the above-mentioned object, the invention of claim 2 has an object to provide a heat exchanger which has a function of supplying and exhausting a substantially constant flow amount from a duct to a heat exchanger, and which is compact and compact. To do. In addition to the above object, the invention of claim 3 aims at more efficiently performing heat exchange between the supply air and the exhaust air.

[0008]

As a means for achieving the above-mentioned object, the invention of claim 1 is a casing that can be installed in a duct piping space in a building such as a building, and one surface side of this casing and others. The air supply inlet and outlet and the air inlet and outlet, which are provided in pairs on the surface side and are connected to the air supply duct and the exhaust duct, respectively, and the heat exchange plates are alternately stacked by stacking a plurality of heat exchange plates in the casing. It is characterized in that it is configured to include an air supply passage and an exhaust passage through which the air supply and the exhaust gas can flow oppositely between the pair of air supply inlets and outlets and between the pair of exhaust air inlets and outlets, respectively.

According to a second aspect of the invention, in the first aspect of the invention, the inlet and outlet of the air supply passage and the exhaust passage are provided on a surface oblique to the surface of the casing on which the air supply inlet and outlet are provided. It is characterized in that it is configured as described above.
The invention of claim 3 is the same as the invention of claim 1 or 2,
It is characterized in that the heat exchange plate is formed with a concave portion or a convex portion for generating a turbulent flow.

[0010]

The operation of the invention of claim 1 is as follows.
When installing, arrange the casing at any position in the duct piping space and connect the air supply duct and the exhaust duct in the middle to the air supply inlet / outlet pair and the exhaust air inlet / outlet pair provided on both sides of the casing. To do. When the supply air flows into the supply air duct and the exhaust air flows into the exhaust air duct, respectively, the supply air and the exhaust air flow in opposite directions to the supply air passage and the exhaust passage alternately formed between the heat exchange plates, and the supply air and the exhaust air flow between them. Heat is exchanged with the exhaust.

The operation of the invention of claim 2 is as follows. First, at the end face of the laminated heat exchange plates corresponding to the face where the inlet and outlet ports of the casing are provided, the end face is divided into two in the width direction, and the inlet and outlet ports of the air supply passage and the exhaust passage are divided into each divided face. Consider a case in which is provided parallel to the entrance and exit of the casing. In that case, if the air supply passage and the exhaust passage are formed every other stage between the heat exchange plates, the actual flow passage cross-sectional area of each outflow inlet of the air supply passage and the exhaust passage is determined by providing those outflow inlets. This is half the area of the raised surface, which is smaller than the entrance / exit of the casing, that is, the cross-sectional area of the duct.

Therefore, for example, when the supply air flows through the supply air duct from the supply air inlet of the casing of the heat exchanger to the supply air passage, at the inlet of the supply passage having the narrowed flow passage cross-sectional area. The amount of distribution will be narrowed down and the amount of air supply will be limited. Of course, exhaust is the same. Therefore, in order not to reduce the flow rate, the heat exchange plate is widened, and the surface where the outflow and outflow ports of the air supply passage and the exhaust passage are provided is made large in advance,
Even if the actual flow path cross-sectional area becomes half the area of the surface, it is necessary to provide a treatment that is comparable to the flow path cross-sectional area of the inlet and outlet of the casing.

In that respect, according to the second aspect of the invention, the inlet and outlet of the air supply passage and the exhaust passage are provided on a surface that is oblique to the surface of the casing on which the air supply inlet and outlet are provided. , Even if the surface itself that provides the inlet and outlet of the air supply passage and the exhaust passage is taken large and the actual flow passage cross-sectional area becomes half of the area of that surface, the air passage of the air supply inlet and exhaust outlet of the casing A flow passage cross-sectional area comparable to the cross-sectional area is ensured. As a result, the supply air and the exhaust air flow from the duct to the heat exchanger without being restricted in flow rate on the way.

According to the third aspect of the present invention, the air supply and the exhaust flow as a turbulent flow in the air supply passage and the exhaust passage, respectively, due to the concave portion or the convex portion provided in the heat exchange plate.

[0015]

That is, according to the invention of claim 1, the heat exchanger can be installed by utilizing the duct piping space as it is,
Eliminates the need for a special installation space for the heat exchanger. In addition, since the installation space can be freely obtained in the duct piping direction, in order to obtain the required heat exchange area, the heat exchanger can be made elongated and large along the duct piping direction, or multiple heat exchanges can be performed. This can be dealt with by connecting the heat exchangers in series, and it becomes possible to widen the intervals of the heat exchange plates without extremely narrowing them. As a result, clogging due to dust or the like is prevented in the heat exchanger, and even if it is clogged, the gap between the heat exchange plates is wide, so cleaning can be performed easily. It eliminates the need for cumbersome and costly maintenance such as cleaning and replacing filters. In addition, since the distance between the heat exchange plates is wide, the flow resistance of the air supply and exhaust can be suppressed to a small extent, so that it is not necessary to provide a special fan as in the conventional case, and the facility cost and the maintenance cost can be significantly reduced. Further, since a heat exchanger can be attached as a part of the duct piping, the construction can be simplified and the construction cost can be reduced, which has various advantages.

According to the second aspect of the present invention, even when ensuring a substantially constant flow rate from the duct to the heat exchanger, the heat exchanger is compact and has a small width, for example, a width corresponding to the parallel width of both ducts. It becomes possible to put together things. Therefore, when the heat exchanger is installed in the middle of the duct, the appearance is neatly arranged, and there is an effect that the heat exchanger can be installed as long as at least the duct piping space is available.

According to the third aspect of the present invention, in addition to the above effects, the supply air and the exhaust air flow in a turbulent manner in the supply air passage and the exhaust air passage, respectively, so that the supply air and the exhaust air are evenly heat-exchanged. The plate can be brought into contact with the plate, and the effect of more efficient heat exchange can be obtained.

[0018]

Embodiments of the present invention will be described below with reference to the accompanying drawings. <First Embodiment> FIGS. 1 to 8 show a first embodiment of the present invention, illustrating a case where the present invention is applied to a centralized air conditioning system of a building. 1 and 2, reference numeral 11 indicates a room 12 in the building.
The air conditioner machine room is provided between the air conditioner and the outer wall 13, and the air conditioner 14 is installed on the floor surface of the air conditioner machine room 11, and the outside air is sucked and sent to the air conditioner 14 on the ceiling side. After that, the air supply duct 15 to be supplied into the room 12 and the room 1
An exhaust duct 16 for discharging the air in 2 to the outside is connected, and the heat exchanger A is connected in the middle thereof.

Next, the structure of the heat exchanger A will be described in detail with reference to FIGS. This heat exchanger A includes an aluminum casing 20 that has been subjected to alumite processing,
A plurality of heat-exchange plates 28 made of aluminum and similarly anodized are housed in a laminated manner. As shown in FIGS. 3 and 4, the casing 20 is composed of a central case 21 having openings on both left and right sides, and a pair of side cases 22 covered so as to cover the left and right openings, and is assembled into a flat rectangular parallelepiped as a whole. It is designed to be used.

Left and right side cases 22 of this casing 20
There are a total of 4 entrances and exits 24 at both ends of each end face.
a to 24d are formed, and four side entrances 25a to 25d are also formed on the side surface. These inlets / outlets 24a to 24d and sub inlets / outlets 25a to 25d are in the shape of a rectangular cylinder having the same height as the thickness of the casing 20 and a constant width, and are connected to the air supply duct 15 or the exhaust duct 16 at the edges thereof. Is formed with a flange 26.

The heat exchange plate 28, as shown in FIGS.
The rectangular shape corresponding to the central case 21 of the casing 20 is formed in a flat hexagonal shape in which isosceles triangular portions whose sides are the bottom sides are connected to the left and right sides, and two types are prepared. As shown in FIG. 3, the length X of the hypotenuse of the isosceles triangular portion of the heat exchange plate 28 is a little longer than twice the width Y of the inlet / outlet 24 and the auxiliary inlet / outlet 25 of the casing, that is, , X = 2Y + α.

As shown in FIG. 5, one of the two types of heat exchange plates 28a has a front edge extending from the rectangular portion to the left triangular portion and a rear edge extending from the rectangular portion to the right triangular portion. Further, the closing wall portion 29 having a constant height (for example, about 1 cm) is formed by raising the edges at right angles and bending them further at right angles. The other heat exchange plate 28b has a closed wall portion 29 having a similar constant height on the front edge extending from the rectangular portion to the right triangular portion and the rear edge extending from the rectangular portion to the left triangular portion. Are formed.

Further, the heat exchange plates 28a and 28b respectively correspond to the widthwise central portions slightly inside the left and right side edges of the rectangular portion and the substantially central portions in the lengthwise direction of the oblique sides of both triangular portions. A total of six bolt insertion holes 30 are opened at the positions (see FIG. 8). It should be noted that bolt insertion holes 30 are also formed on the upper surface and the lower surface of the casing 20 at positions corresponding to the respective insertion holes 30 of the heat exchange plate 28.

Then, using a jig in which six assembly rods are set up in the same arrangement as the above-mentioned bolt insertion holes 30, first, one heat exchange plate 28b is attached to the assembly rods and the bolt insertion holes 30 are formed. They are passed together, and subsequently, a cylindrical spacer 31 having the same height as the closing wall portion 29 is passed through each assembly rod, and then the other heat exchange plate 28a is passed through the assembly rod and laminated and adhered. . After that, two heat exchange plates 28b and 28a of the same number are alternately passed through the assembling rods with the spacer 31 sandwiched therebetween, and the heat exchange plates 28a and 28a are laminated and adhered to each other to form the integrated heat exchange plate unit 32.

The central portion of the heat exchange plate unit 32 is
Inserted into the central case 21 of the casing 20, as shown in FIG. 8, the bolts 34 are inserted through the insertion holes 30 of both bolts on the lower surface of the central case 21, and each heat exchange plate 28a,
A cap nut 35 is screwed into an end portion projecting on the upper surface of the central case 21 through the insertion hole 30 and the spacer 31 of 28 b and tightened. Then, the side cases 22 are fitted to the left and right sides of the central case 21 so as to cover the left and right triangular portions of the heat exchange plate unit 32, and similarly, the side case 22 and the heat exchange plate 28 are connected to the bolts 34 and the bag. It is tightened by the nut 35. Along with that, the central case 21
And the flanges 36 and 37 of the abutting portion of the side case 22
The heat exchange plate units 32 are integrally assembled in the casing 20 by connecting them to each other with bolts.

When the heat exchange plate unit 32 is assembled in the casing 20 as described above, each heat exchange plate 28a, 28a
A plurality of spaces are vertically defined between b and the casing 20. At the left end surface of the heat exchange plate unit 32 in FIG. 3, as shown in FIG. 7, on the front half surface (right side of the drawing), the closing wall portion 29 is arranged in odd-numbered steps from the top.
Block on the back half surface (on the left side of the figure),
It is closed by the closing wall portion 29 at every even number from the top. At the right end face of FIG. 3 of the heat exchange plate unit 33, although not shown in particular, the front half surface is closed by the closing wall portion 29 in even steps from the top, and the back half surface is opened from the top. The odd-numbered stages are closed by the closing wall portion 29.

As a result, in the heat exchange plate unit 33, the first passage 40 having the outflow inlets 39a and 39b at the end surface on the left back side and the end surface on the right front side in FIG. 3, and the end surface on the left front side and the right back side. And the second passage 42 having the inflow and outflow ports 41a and 41b on the end face thereof are configured to intersect with each other every other stage.

Further, as shown in FIGS. 5 and 6, a plurality of raised portions 44 are vertically and horizontally aligned at intervals in the rectangular portion of each heat exchange plate 28a, 28b, and both heat exchange plates 28a are formed. , 28b, the ridges 44 are formed in a phase-shifted state so that they are arranged in a staggered pattern.

Next, the operation of this embodiment will be described. The heat exchanger A assembled as described above is connected midway between the air supply duct 15 and the exhaust duct 16 that are piped along the ceiling. In this embodiment, the casing 20 shown in FIG. The front left entrance 24a is the exhaust entrance, the left rear auxiliary entrance 25b is the air supply exit, the right front entrance 24d is the intake entrance, and the right back entrance 24c is the exhaust exit. Used respectively.
As a result, the first passage 40 in the heat exchange plate unit 33 serves as an air supply passage, and the second passage 42 serves as an exhaust passage.

Then, as shown in FIGS.
Air supply duct 1 drawn in from an air supply port 46 provided in the
5 is a flange 26 at the inlet 24d of the air supply of the heat exchanger A,
The air supply duct 15 which is connected by butting 49 with each other and tightened with a bolt, and which is also connected to the air supply outlet 25b on the opposite side is connected to the supply port 14a of the air conditioner 14, and the discharge port of the air conditioner 14 is connected. The air supply duct 15 drawn out from 14b returns to the ceiling side and is piped inside the room 12. A blower 51 is provided in the exhaust duct 16 drawn out from the room 12, and the exhaust duct 16 is connected to the exhaust inlet 24a of the heat exchanger A and is connected to the exhaust outlet 24c. 16 is connected to an exhaust port 47 provided on the outer wall 13. As described above, the heat exchanger A connected in the middle of the air supply / exhaust ducts 15 and 16
Is supported by being placed on an L-shaped steel that extends over the lower end of an anchor bolt (not shown) that hangs down from the ceiling. The inlet / outlet port 24b and the auxiliary inlet / outlet ports 25a, 25c, 25d of the heat exchanger A, which are not connected to the ducts 15 and 16, are covered with a lid plate 53 as shown in FIGS.
Closed with.

When the supply air from the supply air duct 15 and the exhaust air from the exhaust air duct 16 respectively go to the heat exchanger A,
As shown in FIG. 3, in the heat exchanger A, the supply air flows through the supply air passage 40 from the inlet 24d toward the outlet 25b in the direction of a solid arrow a, and the exhaust air flows through the exhaust passage 42 at the inlet 24a.
Flow from the outlet 24c toward the outlet 24c in the direction of a broken arrow b so as to face each other and intersect in the middle.
Since the ridges 44 are formed in the ridges, they flow in turbulent flow, respectively, during which heat exchange is performed between the supply air and the exhaust air.

Further, the air supply passage 4 of the heat exchange plate unit 32
0 and the outlets 39a, 39b of the exhaust passage 42, 41
Since a and 41b are formed on an inclined surface having a length slightly more than twice the width of the inlets and outlets 24 and 25 of the casing 20, the air supply and exhaust passages 40 and 42 are formed in alternate stages. Even if the actual flow passage cross-sectional area is half the area of the surface, a flow passage cross-sectional area comparable to the inlets and outlets 24, 25 of the casing 20 is secured, and the air supply amount and the exhaust amount can be throttled midway. Absent.

The heat-exchanged air is cooled or heated by the air conditioner 14 and then supplied into the room 12 for cooling or heating, and the heat-exhausted exhaust gas is discharged to the outside. . The doorway 2 which was closed by the lid plate 53
4b and the sub inlets / outlets 25a, 25c, 25d can be used for inspecting the inside of the heat exchanger A or performing simple cleaning by appropriately removing the cover plate 53.

As described above, since the heat exchanger A of this embodiment is used by connecting it in the middle of the piping space of the air supply / exhaust ducts 15 and 16 originally required, it is necessary to provide a special installation space. There is no. In addition, since the piping space of the ducts 15 and 16 can be used freely, when obtaining the necessary heat exchange area, the heat exchanger A itself is replaced by the duct 1 as in this embodiment.
The heat exchange plate 28 is made large along the piping direction of 5 and 16.
The distance between a and 28b can be as wide as about 1 cm. Therefore, clogging due to dust or the like mixed in during air supply / exhaust is prevented, it is not necessary to purposely install a filter, and only the air supply port 46 and the air exhaust port 47 provided on the outer wall 13 are provided with the insect net 55. Will be enough. Even if it is clogged, since the space between the heat exchange plates 28 is wide,
Unused doorways 24b, 25a, 25c or 2
It is possible to easily clean by removing the lid plate 53 of 5d.
That is, maintenance becomes extremely easy.

Further, connecting the ducts 15 and 16 in the middle of the pipes allows easy construction as a part of the pipes of the ducts 15 and 16, and the appearance is neatly organized, as well as the installation cost. It can be kept cheap.

Further, the heat exchange plate 28 has a plane hexagonal shape,
On the slanted end surface of the heat exchange plate unit 32, the inlets 39a, 39b, 41a, 41 of the air supply passage 40 and the exhaust passage 42 are provided.
Since the structure in which the b is provided is provided, the air intake and exhaust ports 24, 2 of the casing 20 are used as the actual flow passage cross-sectional areas of the outflow ports 39a, 39b, 41a, 41b.
A flow path cross-sectional area of 5 is obtained. for that reason,
In order to secure a substantially constant flow rate from the ducts 15 and 16 to the heat exchanger A, the heat exchanger A should be gathered in a small width, for example, in a compact size having a width corresponding to the parallel width of both the ducts 15 and 16. Is possible.

Further, the heat exchange plates 28a, 28b are provided with the ridges 4
4 is provided so that the supply air and the exhaust air 42 flow in a turbulent manner in the supply passage 40 and the exhaust passage 42 respectively, so that the supply air and the exhaust air are evenly contacted with the heat exchange plates 28a, 28b, and Exchange is performed efficiently. If the heat exchange plate 28 is a flat plate, the supply / exhaust gas becomes closer to a laminar flow and the contact efficiency with the heat exchange plate 28 is reduced, but if the necessary heat exchange rate is secured, the heat exchange plate 28 will have a flat plate shape. May be

The heat exchanger A of the present embodiment has a structure that does not matter whether it is upside down or right and left, and the entrance 24 and the sub entrance 2
Since 5 are provided as a pair, the direction of the casing 20 is changed, and a pair of the inlet / outlet 24 and the sub inlet / outlet 25 are provided.
By selectively using and, it is possible to widely support various piping modes of the duct.

<Second Embodiment> FIGS. 9 and 10 show a second embodiment in which the present invention is applied to an individual air conditioning system. In the present embodiment, the air supply duct 61 and the exhaust duct 62 are arranged in parallel with each other on the ceiling of the room 60, and a plurality of branch ducts 63 and 64 branched from them are opened in the ceiling 65 of the room 60. The air supply port 66 and the exhaust port 67 are connected to each other. The air supply duct 61 and the exhaust duct 62 are
The pipes are divided in the vicinity of the end on the outer wall 68 side, and are piped in opposite parallel directions so as to intersect each other at the divided portions,
The ends on the outer wall 68 side are connected to an air supply port 69 and an exhaust port 70 opened in the outer wall 68.

A heat exchanger A having the same structure as that of the above-described first embodiment is provided in the divided portion of the air supply duct 61 and the exhaust duct 62.
Is installed. In this embodiment, the four sub inlets / outlets 25a to 25d of the heat exchanger A are used as inlet / outlet ports for air supply / exhaust,
The respective inlets / outlets 25a to 25d are connected to the divided portions of the air supply / exhaust ducts 61 and 62, respectively. Further, an air supply fan 71 and an exhaust fan 72 are provided at positions on the indoor side of the air supply duct 61 and the exhaust duct 62 with respect to the heat exchanger A, respectively, and an air conditioner 73 is separately provided in the room 60. Is installed.

In the second embodiment, the supply air sucked from the outside air by the supply air fan 71 flows through the supply air duct 61 in the heat exchanger A in the direction of arrow a to be supplied to the room and is exhausted. The exhaust gas sucked from the room by the fan 72 flows through the exhaust duct 62 in the heat exchanger A in the direction of arrow b, and is then discharged to the outside. While flowing in the opposite direction, heat exchange takes place therebetween. That is, when cooling or heating is performed by the air conditioner 73, the supply air introduced from the outside is cooled or heated in advance by using the exhaust gas, so that cooling and heating are efficiently performed.

The unique effects obtained by the structure of the heat exchanger A, and the duct 61 for supplying and exhausting the heat exchanger A,
The effect of the structure connected and used in the middle of 62 is as described in the first embodiment.

The present invention is not limited to the embodiments described with reference to the above description and the drawings. For example, the following embodiments are also included in the technical scope of the present invention. Various modifications can be implemented within a range not departing from.

(1) As a modified example of the second embodiment,
The air supply port 66 and the exhaust port 67 may be provided side by side on the ceiling 65 of the room 60, and the heat exchanger A may be connected between the air supply duct and the exhaust duct connected to them in the vicinity thereof.

(2) In each of the above embodiments, a large heat exchanger A, which is long in the duct direction of the duct, is formed in order to obtain a necessary heat exchange area. However, a plurality of heat exchangers having a short length are used. You may make it connect and use it in series.

(3) The means for producing a turbulent flow in the air supply passage 40 and the exhaust passage 42 of the heat exchanger A is not limited to the one in the above-mentioned embodiment, and the heat exchanging plates 28a and 28b are provided with staggered recesses. Alternatively, one of them may be a flat plate and the other may have a ridge or a recess.

[Brief description of drawings]

FIG. 1 is a front view of an air conditioning system according to a first embodiment of the present invention.

FIG. 2 is a plan view thereof.

FIG. 3 is a plan view of the heat exchanger of this embodiment.

FIG. 4 is a perspective view thereof.

FIG. 5 is a perspective view showing a stacked state of heat exchange plates.

FIG. 6 is an enlarged sectional view showing a bottom structure of a heat exchange plate.

FIG. 7 is a side view showing the end surface of the heat exchange plate unit with the side case removed.

FIG. 8 is an enlarged cross-sectional view showing an assembly structure of a casing and a heat exchange plate.

FIG. 9 is a front view of an air conditioning system according to a second embodiment of the present invention.

FIG. 10 is a plan view thereof.

FIG. 11 is a front view of an air conditioning system according to a conventional example.

[Explanation of symbols]

 A ... Heat exchanger 15 ... Air supply duct 16 ... Exhaust duct 20 ... Casing 24a, 25a ... Exhaust inlet 25b ... Air supply outlet 24c, 25c ... Exhaust outlet 24d, 25d ... Air supply inlet 28a, 28b ... Heat exchange plate 32 ... Heat exchange plate unit 39a, 39b ... Inlet / outlet (of air supply passage 40) 40 ... Intake air passage 41a, 41b ... Inlet / outlet 42 (of exhaust passage 42) 42 ... Exhaust passage 44 ... Raised part (projection) 61 ... Air supply duct 62 …Exhaust duct

Claims (3)

[Claims] 1. A casing that can be installed in a duct piping space in a building such as a building, and a pair of casings are provided on one surface side and the other surface side of the casing, and are connected to an air supply duct and an exhaust duct, respectively. The air supply inlet / outlet and the air exhaust inlet / outlet are alternately configured by stacking a plurality of heat exchange plates in the casing with a space therebetween, and supply is performed between the pair of air supply inlets / outlets and between the pair of exhaust inlets / outlets. A heat exchanger comprising an air supply passage and an exhaust passage through which air and exhaust gas can flow opposite to each other. 2. The inlet and outlet of the air supply passage and the exhaust passage,
The heat exchanger according to claim 1, wherein the heat exchanger is provided on a surface that is oblique to the surface of the casing where the air supply inlet / outlet and the exhaust inlet / outlet are provided. 3. The heat exchanger according to claim 1, wherein the heat exchange plate is provided with a concave portion or a convex portion for generating a turbulent flow.