KR20000035597A - Heat transfer plate and method of producing heat transfer plates - Google Patents

Abstract

PURPOSE: An electric heating plate and a manufacturing method thereof are provided to perform more precise molding by using a synthetic material or synthetic material foil, and improve the thermal conduction and temperature stability since the synthetic material foil is stretched. CONSTITUTION: In a method for manufacturing electric heating plates(11-15), the plateshaving a fluid passing space is formed with a synthetic material or a synthetic material foil such as inflammable polypropylene by deep drawing method by utilizing compression air, the foil of synthetic material is stretched 80-300% from an initial material, a front edge(1) and a side edge(2) of the plates are adjacent to each other for sealing fluid, the plates are coupled with each other by adhesion, compression, thermal welding, pulse welding, and ultrasonic or vibration welding.

Description

Heat transfer plate and method of manufacturing the same {Heat transfer plate and method of producing heat transfer plates}

The present invention relates to a manufacturing method of a heat transfer plate and a plate for heat transfer means.

It is known to use heat transfer means for the newest applications. The basic mode of operation is that the high temperature medium is cooled by a low temperature solvent and the low temperature solvent is heated by a high temperature solvent. This is usually done without contact of the solvents. For example, if used in homes, the incoming cold air is heated in the heat transfer means by the outgoing warm air. This type of heat transfer means is disclosed in German Patent No. 43 33 904. The heat transfer means is made for two stem fluids flowing along a parallel flow channel, and the plates are made of a cross-section and a curved side in which layers are stacked. Thus, the upper plate covers the flow channel of the lower plate. Other fluids may pass through flow channels adjacent the sides. The plates are made of thin metal sheets. Much effort is required to manufacture the curved side to specification.

German patent 296 20 248 U1 discloses a countercurrent heat transfer means of synthetic material or metal sheet. The heat transfer means is composed of a side foil plate. The cross section of the foil plate is zigzag and the upper sides of the two plates are adjacent to each other, and the teeth do not interlock with each other due to the regular formation of teeth having twice the size and width. Subsequent plates are supported on the teeth. The zigzag cross section provides a relatively small surface for heat conduction. With the formation of teeth twice as high, more surfaces are lost for heat conduction.

In addition, British Patent No. 1 336 448 discloses a heat transfer means consisting of a pile of plates in pairs. The cross section of the plates reveals a curved side. The flow channel is formed by connecting two plates. The curved cross section provides a small surface for heat conduction. In addition, the flows intersecting each other perform less heat flow compared to the countercurrent heat transfer means.

An object of the present invention is to improve the plate manufacturing method for heat transfer means and the optimal heat conduction of the side of the plate and the stable stacking arrangement of the plate.

An object of the present invention is carried out by a method for producing a plate for heat transfer means. It has a space for the fluid passage and is produced through a deep drawing method with a synthetic material, in particular a synthetic foil, which is carried out using compressed air. Suitable fluids are liquids and gases, in particular air. Molding and stretching in the deep drawing method is easier than synthetic materials. If the synthetic foil or synthetic material is heated further, it is easier to mold by deep drawing compared to metal foil or metal. The use of compressed air has the advantage that it is carried out at a value of 8-9 times the value implemented by the pressure vacuum technique applied to the molding tool. Thus, more accurate molding can be performed. High pressures allow the production of complex geometric patterns on the sides of the plate, resulting in large thermal surfaces. In addition, this high pressure allows the use of environmentally friendly synthetics rather than PVC. In this respect, the (vacuum) deep drawing performed with the help of compressed air is called high pressure or plasma-deep drawing.

The synthetic foil to be molded must be slightly heated with the compressed air used in the process according to the invention for constant stretching and accurate molding. The synthetic foil to be processed must be slightly cooled at the surface of the molding tool to be molded to a constant strength.

In a preferred application of the invention, the synthetic foil is stretched from 80% -300% compared to the initial material according to the invention. Thus, a surface suitable for nearly three times as much heat conduction as the initial material is produced. In addition, the wall thickness of the foil is drastically reduced by stretching so that the heat conduction between the two solvents flowing into the heat transfer means is better.

Another application of the present invention is that incombustible polypropylene may be used as the synthetic foil. In addition, polypropylene has better thermal conductivity and temperature stability than PVC. Synthetic materials such as polystyrene, polyethylene, methacrylate, or polycarbonate may be substituted.

A novel variant of the invention is that the plates engage in a manner that seals the fluid adjacent to each other at the front and side edges. In this way, the solvents are not mixed.

Another variant of the invention is characterized in that the plates are joined by gluing, compressing, thermal welding, pulse welding, ultrasonic or vibration welding. This ensures a tight coupling of the plate.

In addition, the heat transfer means of the present invention is characterized by good mutual support between the plates and can be used at high pressure in the flow channel. The heat transfer means produced in this manner has a longer life than the metal heat transfer means.

In an embodiment of the plate the fluid passageway space forms a flow channel in which the lateral displacement appears along at least a portion of the width of the axis, the lateral displacement being at the edge of the flow channel of the plate located above or below when the plates are stacked. It is characterized by being adjacent. The lateral displacement has the advantage that the flow of the channel is lost by the lateral displacement. This blockage causes turbulence in the flowing solvent which increases the heat transfer value.

In addition, the displacement extends the flow path. As a result, the extended flow path increases the residence time in the heat transfer means and increases the heat conduction time. Another advantage of lateral displacement is that the two upper plates do not engage each other. The displacement reaches a relatively short distance or the full distance of the plate. The flow channels usually extend parallel to each other.

In a preferred embodiment, the flow channel extends straight, zigzag, curved or horizontally or vertically. This type of flow channel causes turbulence again by deflecting the solvent in a straight direction, thereby increasing the heat transfer value. The deflection extends the time that the solvent stays in the heat transfer means, thereby extending the heat transfer time.

In another preferred embodiment, the flow channels are stacked on top of each other. At the point of intersection the solvent can move from one plane to another, thereby generating a helical flow. In the combination, the direction of the flow channel is selected in such a way that different solvents passing through the heat transfer means do not mix, in particular in one plane, in a manner that does not mix with each other even between the two planes.

1 is a perspective view of a heat transfer means consisting of several plates made according to the invention.

2 is a side perspective view of two channels.

3 is a cross-sectional view from the channel side of three plates stacked with lateral displacements.

4 is a perspective view of a plate with angled channels;

5 is a plan view of a plate with curved channels;

6 is a plan view of a plate in which the channels are zigzag and the channels at the bottom are indicated by dashed lines.

Explanation of symbols on the main parts of the drawings

1: front edge 2: side edge

10: heat transfer means 11: plate

12: plate 13: plate

14: plate 15: plate

16: base surface 17: surrounding wall

18: edge 19: shortest side

20: Shortest surface 30: Upper channel side

31: lower channel side 32: flow channel

33: Right displacement 34: Left displacement

35: channel side 40: edge of displacement 33

41: Edge of displacement 34 50: Zig-zag channel side

51: flow channel 52: front

53: center 54: rear

60: curved flow channel

70: zigzag flow channel (upper plate)

71: Zig-zag flow channel (lower plate)

72: intersection

Embodiments of the plate for heat transfer means of the present invention are described in more detail in the schematic drawings and the accompanying specification.

1 is a perspective view of a heat transfer means consisting of plates made according to the invention.

2 is a perspective view of two channel sides.

Figure 3 shows a cross section from the channel side of three stacked plates with lateral displacements.

4 is a perspective view of a plate with angled channels.

5 is a plan view of a plate with curved channels.

6 is a plan view of a plate in which the channels are zigzag and the lower channel is indicated by a solid line.

1 shows a heat transfer means 10 consisting of five stacked plates 11, 12, 13, 14, 15. Each plate formed as shown in the accompanying drawings

(11,12,13,14,15) is composed of an octagonal base surface 16. The base surface 16 may be of other shapes (eg hexagonal). A plane of the base surface 16 and an angled peripheral wall 17 of 90 < phi < 180 degrees are provided around the base surface 16. The peripheral wall 17 is joined with an edge 18 extending parallel to the plane of the base face 16, which edge 18 ends at the front edge 1 and the side edge 2. The peripheral wall 17 joining the edge 18 is suspended at the shortest both sides of the plates 19, 20.

Figure 2 shows the channel side (30, 31) of the upper base surface and the lower base surface made of a synthetic material by the high pressure deep drawing method. Heat transfer means with flow channels 32 of square or rectangular cross section are realized when the two plates abut the channel sides 30, 31. The flow channel 32 is formed when the upper channel side surface 30 covers the flow channel of the lower channel side surface 31. The upper channel side 30 is a side displacement 33 to the right and the lower channel side 31 is a side displacement 34 to the left so that the channel side surfaces 30 and 31 do not mesh with each other.

FIG. 3 shows a cross section seen from three channel side surfaces 30, 31, 35 stacked according to FIG. 2. The cross section is located in the plane including the lateral displacements 33 and 34. The lateral displacement 34 moves to the left in view of the displacement 33, thereby stably supporting the channel side 30 at the channel side 31. In this position the channel side surfaces 30 and 31 may be bonded or welded together. The heat transfer means is therefore suitable for use at high pressures in flow channels. On the other hand, a small gap occurs between the edges 40 and 41. In this position, the solvent moves from one plane to another to cause rotational flow, thereby causing a disturbance that has a positive effect on the heat transfer process.

4 shows a channel side 50 with a flow channel 51 having a square or rectangular cross section. The solvent flows in the predetermined first direction from the front and the center, and is deflected in the second direction extending at the predetermined angle from the first direction. In the rear 54, the solvent again deflects in the original first direction. This change occurs repeatedly in the flow direction in the heat transfer means.

The deflection of the solvent by the shape of the flow channel causes various disturbances and increases the heat transfer value. The deflection also extends the residence time of the heat transfer means of the solvent, thereby extending the heat transfer time.

5 shows a plan view of a plate having a curved 60 flow channel. Since the support surface of the other plates is huge, this embodiment enables the use of high pressure.

6 shows two plate top views with zigzag flow channels 70 and 71. The zigzag flow channel 70 of the upper plate is shown by the solid line, and the flow channel 71 of the lower plate is shown by the dotted line. At the intersection 72, the solvent moves from one plane to the other to generate rotational flow.

In the method of manufacturing the heat transfer plate, the heat transfer plate is formed to have a space for the air passage. The heat transfer plate is manufactured by a deep drawing method using compressed air with a heated synthetic material, in particular, a synthetic foil. The fluid passageway space of the plate forms a flow channel in which lateral displacement appears in at least a portion of the axial extension line. When the plates are stacked, the lateral displacement is adjacent to the edge of the flow channel of the plate located above or below.

As described above, according to the present invention, 8-9 times the value implemented by the pressure vacuum technique applied to the molding tool by molding the synthetic material, in particular the synthetic material foil using compressed air through the deep drawing method. Can be molded and executed, and therefore, there is an advantage that more accurate molding can be performed. The synthetic foil of the present invention has a high thermal conductivity and temperature stability because it is stretched from 80% -300% compared to the initial material. In addition, the heat transfer means of the present invention has a long life than the metal heat transfer means because the mutual support between the plates is good and can be used at high pressure in the flow channel.

Since the flow channel of the present invention extends in a straight, zigzag, curved or horizontal or vertical direction, the solvent is deflected in a straight direction, causing further turbulence to increase the heat transfer value. This deflection can extend the time that the solvent stays in the heat transfer means, thereby extending the heat transfer time.

Claims (8)

A plate is manufactured by a deep drawing method using a synthetic material, in particular, a synthetic foil, and a space for fluid passage is formed in the plate, and the deep drawing method is a method of manufacturing a heat transfer plate of a heat transfer means using compressed air. The method of claim 1, wherein the synthetic material or the synthetic material foil is stretched by 80% to 300% of the initial material by a deep drawing method. The method of claim 1 or 2, wherein the nonflammable polypropylene is used as a synthetic material or synthetic foil. 4. A method according to any one of the preceding claims, wherein the plates are joined in such a way as to seal the fluid adjacent to each other at the front edge 1 and the side edge 2. The method of claim 4, wherein the plate is bonded by bonding, pressing, thermal welding, pulse welding, ultrasonic welding, or vibration welding. 6. The fluid passageway of any of claims 1 to 5, wherein the fluid passageway defines a flow channel in which lateral displacements appear at least in part of the axial extension line, and when the plates are stacked, the displacement is located above or below. Plate manufacturing method of heat transfer means adjacent to the edge of the flow channel of the plate 7. The method of claim 6, wherein the flow channel extends horizontally or vertically in a straight, zigzag, curved or curved shape. 8. The method of claim 6, wherein the flow channels are stacked to cross each other.