JP2857584B2 - Heat exchanger - Google Patents

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 use in an air conditioning system for buildings such as buildings.

[0002]

2. Description of the Related Art In an air conditioning system for a building such as a building, heat is exchanged between supply air and exhaust air so that indoor ventilation can be performed well and cooling and heating can be performed efficiently. 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 stacked at intervals is accommodated in a casing 3, and an air supply passage and an exhaust passage Are formed, and orthogonal heat exchangers are used in the passages to supply air and exhaust air at right angles to each other, and are installed in the air conditioning machine room 4 alongside the air conditioner 5.

Then, the outside air introduced through the air supply duct 6 is supplied to the air supply passage of the unit 2 as shown by a solid line arrow.
In addition, indoor air is circulated from the exhaust duct 7 to the exhaust passage at right angles to each other in the exhaust passage as shown by a dashed arrow, and heat is exchanged between them. Exhaust after heat exchange is discharged to the outside through the exhaust duct 7. The air supply after the heat exchange is sent to the air conditioner 5 where it is cooled or heated, and supplied from the air supply duct 6 to the room for cooling or heating. That is, before the outside air is cooled or heated by the air conditioner 5, heat is exchanged with the exhaust air from the room, and the outside air is cooled or heated in advance, so that cooling and heating are efficiently performed.

[0004]

However, the conventional heat exchanger 1 is designed to be installed in the air-conditioning machine room 4 as described above, and often needs to be installed in a narrow space. The possible size of the heat exchange plate unit 2 itself is limited. Therefore, in order to secure a necessary heat exchange area under such conditions, the structure in which a large number of heat exchange plates are stacked must be as small as possible.

[0005] If the space between the heat exchange plates is narrow as described above, there is a problem that clogging is likely to occur due to dust and the like mixed in the supply and exhaust. Therefore, it is necessary to clean frequently, but the work is difficult and time-consuming because the space between the plates is narrow,
Moreover, it was a fact that sufficient cleaning could not be performed. To prevent clogging, a filter with a fine mesh is mounted. However, the cost of the filter itself is added to the labor cost for checking and replacing the filter, resulting in a large increase in cost. In addition, the fact that a large number of heat exchange plates are stacked at a narrow interval means that the flow path resistance increases correspondingly, so that it becomes necessary to separately provide a large fan 8 for air supply and exhaust air blowing. Expensive.

The supply / exhaust ducts 6 and 7 are connected to the heat exchanger 1.
When connecting to the air conditioner, the air supply / exhaust ducts 6 and 7 must be pulled down and connected to the floor side of the air conditioner room 4 where the heat exchanger 1 is located. However, there is a disadvantage that as long as the heat exchanger 1 is installed in the air-conditioning machine room 4 and used, maintenance and installation thereof require a large amount of cost.

Accordingly, an object of the present invention is to provide an air conditioning system for a building or the like without requiring extraordinary expenses for maintenance and installation, and to easily perform the work of stacking and assembling heat exchange plates. To provide a possible heat exchanger. It is another object of the present invention to be able to widely support various piping modes of a duct.

[0008]

As means for achieving the above object, a first aspect of the present invention is to provide a casing which can be installed in a duct piping space in a building such as a building, a casing on one side and another casing. Provided in pairs on the surface side, and alternately by stacking a plurality of heat exchange plates at intervals in the casing, with the air supply and exhaust ports and exhaust ports connected to the air supply and exhaust ducts, respectively. A supply passage and an exhaust passage through which supply air and exhaust gas can be opposed to each other between the pair of air supply / exhaust ports and between the pair of exhaust gas entrance / exit ports, and each of the heat exchange plates, It is characterized in that the bolt insertion hole is formed in a penetrating shape.

According to a second aspect of the present invention, in the first aspect of the present invention, the air supply port and the exhaust port are respectively formed by a main port and a sub port which are arranged orthogonally at a corner of the casing. The air supply duct and the exhaust duct can be selectively connected to one of the pair of the main entrance and the sub entrance, and the other entrance that is not connected can be closed by a removable lid plate. It has the characteristic that it has a configuration.

[0010]

<Operation and Effect of the Invention><Invention of Claim 1> 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 middle of the air supply duct and the exhaust duct to the air supply inlet / outlet pair and the exhaust air inlet / outlet pair provided on both sides of the casing, respectively. I do. When air supply flows into the air supply duct and exhaust air flows into the exhaust duct, air supply and exhaust flow in opposite directions through the air supply passage and the exhaust passage alternately arranged between the heat exchange plates. Heat exchange takes place with the exhaust.

That is, according to the first aspect of the present invention, the heat exchanger can be installed using the duct piping space as it is, and there is no need to provide a special installation space for the heat exchanger.
Also, since the installation space can be freely obtained in the duct piping direction, in order to obtain a necessary heat exchange area, the heat exchanger can be elongated and large along the duct piping direction,
Alternatively, it can be dealt with by connecting a plurality of heat exchangers in series, and it is possible to widen the intervals between the heat exchanger plates without extremely narrowing them. As a result, clogging due to dust and the like in the heat exchanger is prevented, and even if clogging occurs, the gap between the heat exchange plates is wide so that it can be easily cleaned. This eliminates the need for cumbersome and expensive maintenance, such as cleaning and replacing filters. Further, since the space between the heat exchange plates is large, the flow path resistance of the supply / exhaust air can be suppressed to a small value. Therefore, it is not necessary to provide a special fan unlike the related art, and the equipment cost and the maintenance cost can be greatly reduced. Further, since the heat exchanger can be attached as a part of the duct piping, the construction can be simplified and the construction cost can be reduced. In each heat exchange plate, bolt insertion holes are formed in a penetrating manner, so assembling rods or bolts are set up on a jig, and the heat exchange plates are sequentially passed through them through the insertion holes. By stacking, the heat exchange plates can be assembled in a stacked manner. That is, the units of the stacked heat exchange plates can be easily and efficiently assembled.

<Invention of Claim 2> The air supply duct and the exhaust duct are respectively connected to one of the main air inlet and the secondary air inlet out of the corresponding air inlet / outlet and the exhaust air inlet / outlet. Closed with a possible lid plate. Since the main entrance and the sub entrance, which are arranged orthogonally to each other, can be selectively used and connected, the heat exchanger can be attached corresponding to various piping modes of the duct. In addition, the doorway not connected to the duct can be used for inspecting the inside of the heat exchanger and performing simple cleaning by appropriately removing the cover plate.

[0013]

[0014]

[0015]

[0016]

[0017]

[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, and exemplify a case where the present invention is applied to a centralized air conditioning system for a building. 1 and 2, reference numeral 11 denotes a room 12 in a building.
The air conditioner room is provided between the air conditioner room and the outer wall 13, and the air conditioner 14 is installed on the floor of the air conditioner room 11, and the outside air is sucked toward the ceiling side and sent to the air conditioner 14. An air supply duct 15 to be supplied into the room 12 and a room 1
An exhaust duct 16 for exhausting the air inside 2 to the outside is piped, and a heat exchanger A is connected on the way.

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,
It is composed of a plurality of heat-exchange plates 28 made of aluminum and also subjected to alumite processing and accommodated in a stacked state. As shown in FIGS. 3 and 4, the casing 20 includes a central case 21 having left and right sides opened, and a pair of side cases 22 which are covered so as to cover the left and right openings, and are assembled into a flat rectangular parallelepiped as a whole. It is supposed to be.

The right and left side cases 22 of the casing 20
Has a total of four doorways 24 at each end of each end face.
a to 24d are formed, and four side entrances 25a to 25d are also formed on the side surface. The entrances 24a to 24d and the sub entrances 25a to 25d have the same height as the thickness of the casing 20 and have a rectangular tube shape having a certain width, and are connected to the air supply duct 15 or the exhaust duct 16 at the edge thereof. Flange 26 is formed.

The heat exchange plate 28 is, as shown in FIGS.
On the left and right sides of a rectangular portion corresponding to the central case 21 of the casing 20, a two-sided flat shell shape is formed by connecting an isosceles triangular portion having the side to the bottom. As shown in FIG. 3, the length X of the oblique side of the isosceles triangle of the heat exchange plate 28 is a length slightly longer than twice the width Y of the entrance 24 and the sub entrance 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 triangle portion, and a rear edge extending from the rectangular portion to the right triangle portion. Then, the edges are raised at right angles, and further bent inward at right angles, thereby forming a closed wall portion 29 having a constant height (for example, about 1 cm). The other heat exchange plate 28b has a similar constant height closed wall portion 29 at the front edge extending from the rectangular portion to the right triangle portion and the rear edge extending from the rectangular portion to the left triangle portion. Are formed.

Each of the heat exchange plates 28a and 28b corresponds to a central portion in the width direction slightly inside the left and right sides of the rectangular portion and a substantially central portion in the length direction of each oblique side of both triangular portions. At positions, insertion holes 30 for a total of six bolts are opened (see FIG. 8). Note that bolt insertion holes 30 are also formed on the upper and lower surfaces 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 assembling rods are erected in the same arrangement as the above-described bolt insertion holes 30, first, the one heat exchange plate 28 b is attached to the assembly rods to form the bolt insertion holes 30. Then, a cylindrical spacer 31 having the same height as the closing wall portion 29 is passed through each of the mounting rods, and then the other heat exchange plate 28a is passed through the mounting rods and adhered. . Thereafter, the two types of heat exchange plates 28b and 28a are alternately passed through the assembling rods by the same number of sheets with the spacer 31 interposed therebetween and stacked and adhered, whereby the integral heat exchange plate unit 32 is formed.

The central portion of the heat exchange plate unit 32 is
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 the heat exchange plates 28 a,
A cap nut 35 is screwed into an end protruding from the upper surface of the central case 21 through the insertion hole 30 and the spacer 31 of 28b and tightened. Subsequently, the side case 22 is fitted on 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. Similarly, the side case 22 and the heat exchange plate 28 It is tightened by a nut 35. At the same time, the central case 21
Flanges 36 and 37 at the butted portion of the side case 22
The components are connected by bolts, and the heat exchange plate unit 32 is integrally assembled in the casing 20.

When the heat exchange plate unit 32 is assembled in the casing 20 as described above, each of the heat exchange plates 28a, 28
A plurality of spaces are defined in the vertical direction between b and the casing 20. On the left end surface of the heat exchange plate unit 32 in FIG. 3, as shown in FIG. 7, on the half surface on the front side (right side in FIG.
At the back half (left side in the figure)
It is closed by the closing wall portion 29 every even-numbered steps from the top. Although not specifically shown, the heat exchange plate unit 33 is closed by the closing wall portion 29 at every even-numbered step from the top on the front half surface and not on the rear half surface from the top, although not particularly shown. It is closed by the closing wall portion 29 every odd number of steps.

Thus, in the heat exchange plate unit 33, the first passage 40 having the outlets 39a and 39b at the left rear end face and the right front end face in FIG. 3, and the left front end face and the right rear side in FIG. And a second passage 42 having outflow / inflow ports 41a and 41b on the end face of each other.

As shown in FIGS. 5 and 6, a plurality of raised portions 44 are vertically and horizontally arranged at intervals on the rectangular portions of the heat exchange plates 28a and 28b. , 28b are formed out of phase with each other so that the raised portions 44 are arranged in a staggered manner.

Next, the operation of this embodiment will be described. The heat exchanger A assembled as described above is connected in the middle of the piping between the air supply duct 15 and the exhaust duct 16 that are piped along the ceiling. In this embodiment, the heat exchanger A shown in FIG. The left front entrance 24a serves as an exhaust inlet, the left rear auxiliary entrance 25b serves as an air supply outlet, the right front entrance 24d serves as an air supply inlet, and the right rear entrance 24c serves as an exhaust outlet. Used respectively.
Accordingly, 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 from air supply port 46 provided in
5 has a flange 26 at the inlet 24d of the air supply of the heat exchanger A,
The air supply duct 15 is connected to the supply port 14a of the air conditioner 14 by connecting butts 49 to each other, and similarly connected to the air supply outlet 25b on the opposite side. The air supply duct 15 drawn out from 14 b returns to the ceiling side and is piped inside the room 12. A blower 51 is interposed in the exhaust duct 16 drawn out of the room 12, and the exhaust duct 16 is connected to the exhaust inlet 24a of the heat exchanger A and the exhaust duct connected to the exhaust outlet 24c. 16 is connected to an exhaust port 47 provided on the outer wall 13. Thus, the heat exchanger A connected in the middle of the supply / exhaust ducts 15 and 16
Is mounted on and supported by an L-shaped steel extending to the lower end of an anchor bolt (not shown) provided hanging from the ceiling. The entrance and exit 24b and the sub-entrances 25a, 25c and 25d of the heat exchanger A, which are not connected to the ducts 15 and 16, have lid plates 53 which are bolted as shown in FIGS.
Closed with

Then, when the air supply from the air supply duct 15 and the exhaust gas from the exhaust duct 16 go to the heat exchanger A,
As shown in FIG. 3, in the heat exchanger A, air is supplied through the air supply passage 40 from the inlet 24 d to the outlet 25 b in the direction of the solid arrow a, and exhaust gas is supplied through the exhaust passage 42 through the inlet 24 a.
Flows toward the outlet 24c in the direction of the dashed arrow b so as to face each other and intersect on the way.
Are formed as turbulent flows, and heat exchange is performed between the supply air and the exhaust air during the turbulence.

The air supply passage 4 of the heat exchange plate unit 32
0, the outlets 39a, 39b of the exhaust passage 42, and 41
Since a and 41b are formed on an oblique surface having a length slightly more than twice the width of the entrances 24 and 25 of the casing 20, supply and exhaust passages 40 and 42 are formed every other level. Even if the actual flow path cross-sectional area becomes half of the area of the surface, a flow path cross-sectional area equivalent to the entrances and exits 24 and 25 of the casing 20 is secured, and the air supply amount and the exhaust amount may be reduced on the way. Absent.

The supply air after the heat exchange is cooled or heated by the air conditioner 14 and then supplied into the room 12 for cooling or heating, and the exhaust gas after the heat exchange is discharged outside. . The entrance 2 closed by the cover plate 53
4b and the sub-entrances 25a, 25c, 25d can be used for inspecting the inside of the heat exchanger A and performing simple cleaning by appropriately removing the cover plate 53.

As described above, since the heat exchanger A of this embodiment is used by being connected in the middle of the piping space of the supply / exhaust ducts 15 and 16 which are originally required, it is necessary to provide a special installation space. There is no. Further, since the piping space of the ducts 15 and 16 can be used freely, when obtaining a necessary heat exchange area, the heat exchanger A itself is connected to the duct 1 as in the present embodiment.
5 and 16 are made large along the pipe direction,
The distance between a and 28b can be made as wide as about 1 cm. Therefore, clogging due to dust or the like mixed in during air supply and exhaust is prevented, and there is no need to separately mount a filter. Simply, an insect net 55 is provided between the air supply port 46 and the exhaust port 47 provided on the outer wall 13. Is sufficient. Even if it is clogged, since the interval between the heat exchange plates 28 is wide,
Doorways 24b, 25a, 25c or 2 not used
The 5d lid plate 53 can be removed for easy cleaning.
That is, maintenance becomes extremely simple.

The connection in the middle of the pipes of the ducts 15 and 16 means that the work can be easily performed as a part of the pipes of the ducts 15 and 16, so that the appearance is uncluttered and the construction cost is reduced. It can be kept cheap.

Further, the heat exchange plate 28 has a flat tortoiseshell shape,
Outflow inlets 39a, 39b, 41a, 41 of the air supply passage 40 and the exhaust passage 42 on the oblique end surface of the heat exchange plate unit 32.
b, the inlet and outlet ports 24, 2, 2, and 3 of the casing 20 can be used as the actual cross-sectional area of the flow passages of the outlets 39 a, 39 b, 41 a, and 41 b.
A product comparable to the cross-sectional area of 5 is obtained. for that reason,
In order to ensure a substantially constant flow rate from the ducts 15 and 16 to the heat exchanger A, the heat exchanger A should be made small and compact, for example, having a width equivalent to the parallel width of both ducts 15 and 16. Becomes possible.

Further, the raised portions 4 are provided on the heat exchange plates 28a and 28b.
4 is provided so that the supply air and the exhaust air flow in the air supply passage 40 and the exhaust passage 42 in a turbulent flow, respectively, so that the air supply and the exhaust are uniformly contacted with the heat exchange plates 28a and 28b, Exchange is performed efficiently. When the heat exchange plate 28 is formed as a flat plate, the supply / exhaust flow becomes close to a laminar flow, and the contact efficiency with the heat exchange plate 28 is reduced. However, if the required heat exchange rate is secured, the heat exchange plate 28 becomes flat. It may be.

Further, the heat exchanger A of this embodiment has a structure that does not matter on the left and right sides of the top and bottom.
5 are provided as a pair, the direction of the casing 20 is changed, and a pair of the entrance 24 and the sub entrance 25 are formed.
It is possible to widely correspond to various piping modes of the duct by properly using the above.

<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, an air supply duct 61 and an exhaust duct 62 are arranged in parallel with each other behind 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 supply duct 61 and the exhaust duct 62
Each is divided near the end on the outer wall 68 side, and the pipes are arranged in opposite parallel directions so as to cross each other at the divided portion,
Each end on the outer wall 68 side is 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 first embodiment is provided at a portion where the air supply duct 61 and the exhaust duct 62 are separated.
Is interposed. In the present embodiment, four sub-entrances 25a to 25d of the heat exchanger A are used as supply and exhaust entrances,
The entrances 25a to 25d are connected to the divided portions of the supply and exhaust ducts 61 and 62, respectively. An air supply fan 71 and an exhaust fan 72 are provided at positions on the indoor side of the heat exchanger A of the air supply duct 61 and the exhaust duct 62, respectively. Is installed.

In the second embodiment, the supply air sucked from the outside air by the supply fan 71 flows through the air supply duct 61 in the heat exchanger A in the direction of the arrow a and is supplied to the room. The exhaust air sucked from the room by the fan 72 flows through the exhaust duct 62 in the heat exchanger A in the direction of the arrow b, and is then exhausted to the outside. While flowing in the opposite direction, heat exchange is performed between them. 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 using the exhaust gas, and the cooling and heating are efficiently performed.

The specific effects obtained with the structure of the heat exchanger A, and the heat exchanger A is connected to a supply / exhaust duct 61,
The effect of the configuration 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 drawings. For example, the following embodiments are also included in the technical scope of the present invention. Various changes can be made without departing from the scope of the present invention.

(1) As a modification of the second embodiment,
An air supply port 66 and an air 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 air exhaust duct connected to them in the vicinity.

(2) In each of the above embodiments, a large heat exchanger A long in the pipe direction of the duct was formed in order to obtain a necessary heat exchange area. They may be used by connecting them in series.

(3) The means for generating the turbulent flow in the air supply passage 40 and the exhaust passage 42 of the heat exchanger A is not limited to the above-described embodiment, and the heat exchange plates 28a and 28b may be provided with staggered concave portions. It is also possible to form one of them as a flat plate and to form a raised portion or a concave portion on the other.

[Brief description of the 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 the present 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 the heat exchange plate.

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

FIG. 8 is an enlarged sectional view showing an assembling 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 units 39a, 39b ... inlet / outlet (of air supply passage 40) 40 ... air supply passage 41a, 41b ... inlet / outlet (of exhaust passage 42) 42 ... exhaust passage 44 ... ridge (convex) 61 ... air supply duct 62 …Exhaust duct

Claims (2)

(57) [Claims] 1. A casing that can be installed in a duct piping space in a building such as a building, and a casing is provided in a pair on one surface side and the other surface side of the casing, and is connected to an air supply duct and an exhaust duct, respectively. The air supply port and the exhaust port are alternately configured by stacking a plurality of heat exchange plates at intervals in the casing, and the air supply port is provided between the pair of air supply ports and between the pair of exhaust ports. An air supply passage and an exhaust passage are provided to allow air and exhaust air to face each other , and a bolt insertion hole penetrates each of the heat exchange plates.
A heat exchanger characterized by being formed in a shape . 2. The air supply port and the exhaust port,
Each is arranged orthogonally at the corner of the casing.
Air supply duct formed by the main entrance and the secondary entrance
And the exhaust duct are connected to the main entrance and the secondary entrance.
Can be selectively connected to either one of the pair
The other entrance is not closed by a removable lid.
The heat exchanger according to claim 1, wherein the heat exchanger is provided.