KR200274469Y1 - Plate structure of heat exchanger for air-conditioning equipments - Google Patents

Abstract

The present invention relates to a heat exchange plate laminated structure for a plate heat exchanger of an air conditioner. The heat exchange plate 30 constituting the present invention has a connecting end 33 at both ends thereof, and a plurality of supporting concave-convex portions 35 are provided on the surface at predetermined intervals vertically and horizontally. The support concave-convex portion 35 is composed of convex protrusions 36 formed to protrude on the surface of the heat exchange plate 30 and convex protrusions 37 formed to concave in the opposite direction to the convex protrusions 36. It is molded to have a continuous curved surface. In particular, the at least one convex protrusion 36 and the concave protrusion 37 are formed to form a pair, and imaginary lines connecting their centers are perpendicular to each other. In the heat exchange plate stacking structure according to the present invention having such a configuration, the flow path 40 at the contact portion between the support uneven parts 35 for maintaining the gap between the flow paths 40 and 40 'formed between the heat exchange plates 30 is provided. 40 ') hardly occurs deformation due to the internal pressure difference, and the differential pressure stiffness is improved. Therefore, the gap between the flow paths 40 and 40 'can be more accurately maintained, thereby minimizing pressure loss, minimizing deformation and breakage of the heat exchanger plate 30, and increasing the differential pressure stiffness to increase the thickness of the base material. It can be made thinner has the advantage of reducing material costs.

Description

Plate structure of heat exchanger for air-conditioning equipments

The present invention relates to an air conditioner, and more particularly, to a laminated structure of a heat exchange plate constituting a plate heat exchanger used in the air conditioner.

In the case of large buildings, air conditioners are used to make the interior space comfortable. The air conditioner serves to maintain the internal space of the building at a desired temperature and humidity.

In general, in order to save energy for heating and cooling the internal space in large buildings, the internal space and external insulation and sealing should be thoroughly. However, various pollutants are generated in the interior spaces of buildings. That is, for example, pollutants generated from people living in the interior spaces of buildings and pollutants generated from interior materials or office equipment of buildings.

Such pollutants threaten the health of people living in the interior spaces of buildings, and therefore, in order to keep the interior spaces comfortable, it is necessary to supply fresh outside air. For this purpose, an air conditioner having a waste heat recovery type ventilation function has been widely used. 1 schematically shows a configuration of a waste heat recovery type air conditioner having a heat exchanger according to the prior art.

As shown in the drawing, one side of the air conditioner 1 is provided with an inlet duct 3 connected to the inner space of the building through a separate duct. The inlet duct 3 is provided with a filter 3f for purifying the air entering through the inlet duct 3. And the other side of the air conditioner (1) is provided with an outlet duct (5) connected through a separate duct and the building interior space.

A return fan unit 7 is provided in front of the outlet side of the inlet duct 3 to suck air from the internal space through the inlet duct 3. A recirculation damper 9 is installed in front of the return fan unit 7. And it is provided with a plate heat exchanger 20 to be described below in communication with the return fan unit (7) side. Accordingly, the air exiting the return fan unit 7 is divided into the plate heat exchanger 20 and the recirculation damper 9 at a predetermined ratio according to the operation of the recirculation damper 9.

The cooling and heating unit 11 is provided at a position passing through the recirculation damper 9. The air conditioning unit 11 is provided with a heating and cooling coil to make the temperature of the air passing through a predetermined value. In addition to the air passing through the recirculation damper 9, the air sucked from the outside of the building is transferred to the air conditioning unit 11 through the plate heat exchanger 20. The humidifier 13 for controlling the humidity of the air is installed at the position passing through the air-conditioning unit 11.

The air supply fan unit 15 is installed in front of the humidifier 13. The air supply fan unit 15 serves to transfer the air inside the air conditioner 1 back to the interior of the building, and is installed near the inlet of the outlet duct 5.

On the other hand, the outside air duct 17 and the exhaust duct 19 are respectively provided so as to be connected between the return fan unit 7 and the cooling and heating unit (11). The exhaust duct 19 is in communication with the return fan unit 7 side, the outside air duct 17 is in communication with the air-conditioning unit (11).

Here, the outside air duct 17 is provided with an outside air damper 17d for adjusting the amount of outside air sucked in, and an inlet of the outside air duct 17 is provided with a filter 17f for purifying the outside air being sucked. do. The exhaust duct 19 is provided with an exhaust damper 19d for adjusting the amount of air exhausted to the outside.

The outside air duct 17 and the exhaust duct 19 pass through the plate heat exchanger 20 to communicate with the inside of the air conditioner 1. The plate heat exchanger 20 performs heat exchange between the air passing through the outside air duct 17 and the exhaust duct 19 to exhaust waste heat of air discharged from the inside of the building to the outside of the building. It serves to deliver the air sucked into the interior.

The configuration of such a plate heat exchanger 20 will be described with reference to FIGS. 2 and 3. The plate heat exchanger 20 is configured such that a plurality of substantially rectangular heat exchange plates 21 are sequentially stacked to form flow paths 22 and 22 'between the heat exchange plates 21. For example, the flow passage 22 communicates with the exhaust duct 17 and the flow passage 22 'communicates with the outdoor air duct 19 so that heat exchange between the air flowing through the respective flow passages 22 and 22' is performed. Get up.

Here, looking at the configuration of the heat exchange plate 21, both ends of the heat exchange plate 21, the connecting end 23 is formed to be stepped. The connecting end 23 is fastened between the heat exchange plates 21 stacked on each other. In order to form flow paths 22 and 22 ′ between the heat exchange plates 21, uneven channels 25 and uneven protrusions 27 are formed, respectively. The uneven channel 25 is formed to be elongated in the direction orthogonal to the connection end 23 of the both ends, it is formed to be recessed to the lower side with reference to Figure 2, the uneven projection 27 is the uneven channel 25 It is formed at predetermined intervals between and is formed to protrude upward. Of course, the uneven channel 25 may be formed to be recessed downwardly in the same shape as the uneven protrusions 27, and the cross-sectional view of FIG. 3 shows that the uneven channel 25 is formed in the uneven protrusions 27 form for convenience of description. Doing.

In stacking the heat exchanger plate 21 having such a configuration, one is placed in the state of FIG. 2 and the upper and lower ones are rotated by 90 °, respectively. The uneven protrusions 27 are in contact with and supported by the uneven channels 25 of the heat exchange plate 21 positioned at the upper portion, thereby forming flow paths 22 and 22 ′ between the heat exchange plates 21. Accordingly, the directions of the flow paths 22 and 22 'intersect in space at 90 ° to each other.

On the other hand, the main specifications indicating the performance of the plate heat exchanger 20 is the heat recovery efficiency and pressure loss. The heat recovery efficiency is a measure of how efficiently the heat energy of the exhaust gas is recovered and the higher the better. The pressure loss is the lower the resistance received when air passes through the flow paths 22, 22 'of the plate heat exchanger 20. These performances largely depend on the shape of the heat exchange plate 21. In addition, the air flowing along the flow paths 22 and 22 ′ may form turbulent flow to form ripples on the surface of the heat exchange plate 21 in order to allow heat exchange.

However, the prior art having the above configuration has the following problems.

The differential pressure stiffness is as important as the heat recovery efficiency and pressure loss in the plate heat exchanger 20. The differential pressure stiffness is generated by the pressure difference of the air flowing through the flow paths 22 and 22 '. That is, the exhaust conveyed by the return fan unit 7 and passing through the flow path 22 is in a positive pressure state higher than atmospheric pressure, and the outside air conveyed by the air supply fan unit 15 and passed through the flow path 22 ′. Sound pressure is lower than atmospheric pressure.

Therefore, the heat exchange plate 21 of the plate heat exchanger 20 is deformed in a low pressure direction due to the pressure difference between the flow paths 22 and 22 ', so that the flow path 22' becomes relatively narrow and the flow path 22 ) Becomes relatively wider.

As shown in FIGS. 3 and 4 due to the deformation of the flow paths 22 and 22 ′, the differential pressure acting on the heat exchange plate 21 is combined with the force of contact through adjacent contact points with the heat exchange plate 21. (F, F ') is passed. In the conventional structure, the arrangement of the contact points spreads transversely with respect to the direction of action of the force, so that the length L of the arms between the pairs is long, so that the load cannot be reasonably supported by the mechanical structure. That is, the contact between the uneven protrusions 27 and the uneven channels 25 is separated by the deformation of the heat exchange plate 21 due to the combined loads F and F '.

Such deformation is accumulated in the plate heat exchanger 20 formed by stacking tens to hundreds of heat exchange plates 21 to cause the heat exchange plate 21 to be permanently deformed or to cause damage to the heat exchanger 20. For reference, the differential pressure stiffness can be used as a measure of how small the change in pressure loss is when there is a given pressure difference.

Therefore, an object of the present invention is to solve the problems of the prior art as described above, and to provide a heat exchange plate laminated structure in which deformation is minimized by a pressure difference.

Another object of the present invention is to increase the space keeping capability between the heat exchanger plate constituting the plate heat exchanger.

1 is a block diagram showing a configuration of an air conditioner having a plate heat exchanger according to the prior art.

Figure 2 is a perspective view of a heat exchange plate constituting a plate heat exchanger according to the prior art.

Figure 3 is a cross-sectional view showing a heat exchange plate laminated structure of the plate heat exchanger according to the prior art.

Figure 4 is an explanatory view showing a force relationship acting on the heat exchange plate of the plate heat exchanger according to the prior art.

5 is a perspective view of a heat exchange plate forming a heat exchange plate laminated structure according to the present invention.

6A is a cross-sectional view taken along the line AA ′ of FIG. 5.

6B is a cross-sectional view taken along the line BB ′ of FIG. 5.

7 is a cross-sectional view showing a heat exchange plate laminated structure according to the present invention.

8 is an explanatory view showing a force relationship acting on the heat exchange plate in the heat exchange plate laminated structure according to the present invention.

Figure 9 is a plan view showing another embodiment of the support uneven portion constituting the present invention.

Explanation of symbols on the main parts of the drawings

1: air conditioner 3: inlet duct

5: Exit duct 7: Return fan unit

9: Recirculation damper 11: Air conditioning unit

13: Humidifier 15: Air supply fan unit

17: Outdoor duct 19: Exhaust duct

17f: filter 20: plate heat exchanger

30: heat exchange plate 33: connection end

35: support uneven portion 36: iron projection

37: concave protrusion 40,40 ': Euro

According to a feature of the present invention for achieving the object as described above, the present invention is a plurality of heat exchange plate is formed in a plate shape, the heat exchange plate intersects with the iron projection and the iron projection formed to protrude adjacent to one surface of the heat exchange plate Concave convex protrusions are formed to be adjacent to one side of the concave and provided with a plurality of support concave-convex portions formed at predetermined intervals, and the convex protrusions and concave protrusions of adjacent heat exchanger plates contact each other to form a gap between the heat exchanger plates. It is characterized by.

The convex and concave protrusions are formed to form a curved surface that is continuous with each other.

The convex protrusion and the concave protrusion are composed of any one of a hemispherical shape and a semi-cylindrical shape lying down.

At least one of the convex and concave protrusions may be formed in pairs, and virtual lines connecting the centers of the convex and concave protrusions are perpendicular to each other.

Both ends of the heat exchange plate are connected to each other to form a stepped step to couple adjacent heat exchange plates.

The heat exchange plates are stacked such that the connecting ends of adjacent ones cross each other by 90 °.

According to the heat exchanger plate stacking structure of the plate heat exchanger of the air conditioner according to the present invention having such a configuration, the cross-sectional area of the flow path formed between the heat exchanger plate is maintained uniformly and the deformation between There is an advantage that no breakage occurs.

Hereinafter, with reference to the accompanying drawings, a preferred embodiment of a heat exchange plate laminated structure for a plate heat exchanger of the air conditioner according to the present invention will be described in detail.

5 is a schematic configuration of a heat exchanger plate according to an embodiment of the present invention in a perspective view, FIG. 6 is a cross-sectional view taken along line A-A 'and B-B' in FIG. 5, and FIG. 7 is a laminate according to the present invention. The structure is shown in cross section.

As shown in these figures, the heat exchange plate 30 of the present invention is substantially rectangular. Four corners of the heat exchanger plate 30 are chamfered, and both ends of the heat exchanger plate 30 are stepped to form a connection end 33. The connecting end 33 serves to fasten adjacent heat exchange plates 30 to each other.

On the surface of the heat exchange plate 30, a plurality of support uneven parts 35 are formed at predetermined intervals. The support concave-convex portion 35 is arranged so that a plurality of the predetermined uneven portion has a predetermined interval horizontally and vertically. The support concave-convex part 35 forms a gap between adjacent heat exchange plates 30 to form flow paths 40 and 40 '. Through the flow paths 40 and 40 ′, exhaust exhausted from the inside of the building to the outside and air sucked into the interior from the outside of the building pass, respectively.

The support uneven portion 35 is composed of a convex projection 36 and concave projection 37, respectively. The convex protrusion 36 is formed to protrude to the upper portion of the heat exchange plate 30 with reference to FIG. 5, and the convex protrusion 37 is formed to be concaved on the upper portion of the heat exchange plate 30. The convex protrusion 36 and the concave protrusion 37 were formed in a hemispherical shape in this embodiment. The convex protrusion 36 and the concave protrusion 37 may be formed in pairs, respectively, and the imaginary lines connecting the protrusions 36 and 37 may be perpendicular to each other. As such, the virtual lines connecting the convex protrusions 36 and the concave protrusions 37 are orthogonal to form the same heat exchange plate 30 so that the adjacent ones are stacked in a state of being rotated by 90 °.

Meanwhile, the convex protrusions 36 and the concave protrusions 37 adjacent to each other should be formed in a curved surface where the surfaces thereof are continuous with each other. As such, it is well illustrated in FIG. 7 that the convex protrusion 36 and the concave protrusion 37 are formed in a continuous surface.

The heat exchange plate 30 having such a configuration is stacked in plural as shown in FIG. At this time, the flow paths 40 and 40 'are formed between the heat exchange plates 30 by the support protrusions 35 formed on the respective heat exchange plates 30. Here, the air discharged to the outside of the building from the building interior space passes through the flow path 40, and the air sucked into the building outside the building through the flow path 40 'passes, in the case of heating The heat of the air discharged through the flow path 40 is transferred to the air sucked through the flow path 40 'and recovered.

At this time, the adjacent heat exchange plate 30 is rotated 90 °, the heat exchange plate 30 in which the concave protrusion 37 of the heat exchange plate 30 in the upper portion relative to FIG. In contact with the iron projection 36 of the heat exchange plate 30 to form a gap.

Meanwhile, FIG. 9 shows other embodiments of the support protrusion 35 according to the present invention. The protrusions may be formed of a hemispherical one and a semicylindrical one lying down. In FIG. 9A, two convex protrusions 136 are formed to be semi-circularly adjacent to each other, and hemispherical convex protrusions 137 are formed to be symmetrically symmetrically based on the convex protrusion 136.

In addition, in 9b, one convex protrusion 236 is formed in a semi-cylindrical shape, and two semi-cylindrical convex protrusions 237 are formed adjacent to each other symmetrically with respect to the convex protrusion 236.

In FIG. 9C, the hemispherical convex protrusions 337 are symmetrically formed on the basis of the convex protrusions 336 having a semi-cylindrical shape.

In FIG. 9D, the semi-cylindrical convex protrusion 436 and the semi-cylindrical concave protrusion 437 are formed to form a rectangle. As such, the embodiments illustrated in FIG. 9 may be appropriately employed according to the design conditions of the plate heat exchanger.

Hereinafter, the operation of the plate heat exchanger laminated structure of the plate heat exchanger of the air conditioner according to the present invention having the configuration as described above will be described. For the description of the operation, reference is made to the embodiment shown in FIG. 6 for convenience.

Plate heat exchanger using a laminated structure of the present invention is configured by stacking a plurality of heat exchange plates 30 having the configuration as described above in turn. At this time, in laminating the heat exchange plate 30 in order to be stacked so that the adjacent heat exchange plate 30 is rotated by 90 °.

In this case, the iron projections 36 of the heat exchanger plate 30, which are relatively at the bottom (see FIG. 7), are brought into contact with the concave protrusions 37 of the heat exchanger plate 30, which are relatively at the upper portion of the heat exchanger plate 30. Gaps are formed between the cross-circuits to form flow paths 40 and 40 '. This is because the convex protrusions 36 and the concave protrusions 37 come into contact with each other so that the adjacent heat exchange plates 30 are stacked in a state of being rotated by 90 degrees.

And the flow path 40 is connected to the duct and the air conditioner so that the exhaust discharged to the outside in the building interior space, for example, the flow path 40 'allows the air sucked into the building interior space from the outside to pass. . In this case, air having a temperature difference passes through each of the adjacent flow paths 40 and 40 ', and heat exchange occurs between them to recover waste heat.

On the other hand, when the heat exchange plate 30 is stacked as described above, the deformation as shown by the dotted line in Figure 7 may occur due to the pressure difference generated by the air flows through the flow path (40). That is, positive pressure is formed inside the flow path 40 by the return fan unit, and exhaust gas discharged to the outside from the building interior space passes, and negative pressure is formed inside the flow path 40 'by the air supply fan unit. Therefore, the air sucked from the outside into the building interior space passes. Therefore, the flow passage 40 'may be deformed in a relatively narrowing direction, and the flow passage 40 may be deformed in a relatively widening direction.

However, in the present invention, a load acts on one heat exchange plate 30 as shown in FIG. 8. That is, a combined load (F, F ') of pressing the convex protrusion 36 and the concave protrusion 37 in opposite directions to each other acts, and the convex protrusion 36 and the convex protrusion 37 are one support yaw. Since it is configured in the convex part 35 and adjacent, the arm length L between the mutually opposite force loads F and F 'becomes relatively short, and the deformation on the side of the supporting concave-convex part 35 supporting the adjacent heat exchange plate 30 is made. This rarely occurs. Of course, a slight deformation occurs in the region except the support uneven portion 35 (indicated by the heat transfer portion in the drawing). However, since there is almost no deformation in the support uneven portion 35, the deformation in the heat transfer part is also relatively small.

In the laminated structure of the heat exchanger plate for the plate heat exchanger of the air conditioner according to the present invention as described in detail above, the convex and concave protrusions for contacting the heat exchanger plates in the opposite directions to the supporting concave and convex portions maintaining the gap between adjacent heat exchanger plates. Are formed adjacent to each other, the arm length between the combined load due to the pressure difference in the flow path formed between the heat exchanger plate is relatively short and almost no deformation occurs near the support uneven portion.

Therefore, the gap between the heat exchange plates is kept stable against the pressure difference between adjacent flow paths, thereby reducing pressure loss and minimizing deformation and breakage of the heat exchange plates.

According to the structure of the present invention, as the differential pressure stiffness increases, the thickness of the base material forming the heat exchange plate can be reduced, thereby reducing the material cost of the plate heat exchanger.

Claims (6)

A plurality of heat exchange plates formed in a plate shape, It is provided with a convex protrusion formed to protrude adjacent to one surface of the heat exchange plate and a concave protrusion formed to be adjacent to the one surface of the heat exchange plate to intersect with the iron projection and has a plurality of support uneven parts formed at predetermined intervals, A heat exchange plate stacking structure for a plate heat exchanger of an air conditioner, wherein the convex protrusions and concave protrusions of adjacent heat exchanger plates contact each other to form a gap between the heat exchanger plates. The heat exchange plate stacking structure of claim 1, wherein the convex protrusion and the convex protrusion are formed to have a continuous surface. 3. The heat exchange plate stacking structure of claim 1 or 2, wherein the iron protrusions and the concave protrusions are composed of one of a hemispherical shape and a semi-cylindrical shape lying down. The plate heat exchanger of claim 3, wherein at least one of the convex protrusions and the concave protrusions is formed in pairs, and imaginary lines connecting the centers of the convex protrusions and the convex protrusions are perpendicular to each other. Heat exchanger stack structure. The heat exchanger plate stacking structure of claim 1 or 4, wherein both ends of the heat exchanger plate are connected to each other so that adjacent heat exchanger plates are coupled to each other. 6. The heat exchange plate stacking structure according to claim 5, wherein the heat exchange plates are stacked such that adjacent ends of adjacent heat exchangers are alternated by 90 °.