JPH0622781U - Laminated heat exchange core - Google Patents

Abstract

(57) [Summary] [Purpose] A flat tube is formed by caulking one of a pair of plates with oval openings at both ends and forming a flat tube. The heat exchange core is lightweight and has little brazing leakage by connecting the opening flanges to form a two-fluid flow path between each tube and between each tube. [Structure] The tubes 8 formed by caulking the first and second plates 4 and 6 are laminated, the openings 10, 15 and 11, 16 at both ends are connected, and the distance between the tubes is set by the opening flanges 12 and 13. While maintaining the above, a flow path for two fluids is formed inside and outside the tube. By making the opening oval, the width of the flow path on the outside of the tube is defined, and the heat exchange core of two fluids is formed only by combining the plates, it is lightweight, the number of parts is small, and the risk of brazing leakage is reduced. To do.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a laminated heat exchange core in which heat is exchanged between two fluids through a plate.

[0002]

[Prior art]

 Conventionally, as a laminated heat exchange core, a pair of side surfaces of a laminated body in which plates are laminated are used as one fluid inlet / outlet surface, and openings are provided on the upper and lower surfaces to serve as the other fluid inlet / outlet. Is disclosed in Japanese Utility Model Laid-Open No. 4-33863, in which two fluids are made to flow in parallel (in the same direction or in opposite directions).

In this heat exchange core, plates having standing walls at the front and rear edges of a rectangular plate are fitted to form a laminated body, and the left and right side surfaces are normally closed every other layer to allow one fluid to flow in. A communicating passage is formed in the laminated body for communicating the layers whose left and right side surfaces are closed, and openings at the start and end of the communicating passage are provided on the upper and lower surfaces of the laminated body.

[0004]

[Problems to be solved by the device]

 The above-mentioned conventional one cannot obtain a cross flow when it is desired to improve the heat exchange efficiency by making the flow of two fluids in the heat exchange core be a cross flow.

Further, since one fluid flowing in and out from the left and right side surfaces of the heat exchange core has a communication passage for the other fluid provided in the layer, the inlet portion and the outlet portion of the flow passage of each layer communicate with the other fluid. It is divided into passages and narrowed, resulting in a large pressure loss. In particular, when this fluid is a gas with a relatively low pressure, the effect of pressure loss due to this passage resistance is large and performance is impaired.

[0006] Further, on the left and right side surfaces of the heat exchange core, normally, every other layer must be arranged as a closing bar material for forming the other fluid flow path, resulting in a large weight and The man-hour also becomes large. In addition, there is a great risk of brazing leakage at the parts where the plates fit together and where the bars are inserted.

[0007]

[Means for Solving the Problems]

 The heat exchange core of the present invention is a flat tube by caulking the first and second plates, which are substantially rectangular and have peripheral flanges on the peripheral edges, and have oblong shapes that are long in the front-rear direction at both ends of the first and second plates. The openings are provided, an opening flange is formed on the periphery of the opening, the required number of tubes are stacked, and the tubes are connected by connecting the opening flanges. It is formed so as to be more surely secured by the rising height of. Since four openings are formed on the upper and lower surfaces of both sides of the laminated body thus formed, one of the one side edge or one of the both side edges is closed.

[0008]

[Action]

 In the heat exchange core having the above-described structure, one fluid enters through the opening at one end of the upper and lower surfaces, divides in each tube, and flows out through the opening at the other end of the upper and lower surfaces. When there is an opening on both the upper and lower surfaces at one side edge, that opening is usually the inlet side and the air inlet.

In the other fluid, the intervals between the tubes serve as flow passages, and the front and rear surfaces of the heat exchange core serve as the inflow surface and the outflow surface. The left and right side surfaces of this flow path are defined by opening flanges that are long in the front-rear direction at both ends. In this way, an orthogonal flow path is formed between the two fluids for heat exchange via the plate.

[0010]

【Example】

 As shown in FIGS. 1 and 2, the laminated heat exchange core 1 includes a peripheral flange 5 of a first plate 4 having a substantially rectangular dish shape and a peripheral flange 7 of a second plate 6 having a substantially rectangular shape. The flat tube 8 is formed by caulking the circumference (see FIG. 3) and is laminated.

In the first plate 4, the peripheral flange 5 is formed higher than the flat portion 9 by a step a, and openings 10 and 11 are provided at both side ends of the flat portion to lower the step b from the flat portion on the periphery thereof. Opening flanges 12 and 13 are provided, which are folded in a U shape. The opening flanges 12 and 13 have an oval shape that is long in the front-rear direction, and the front-rear ends in the long-axis direction are close to the front-rear edges of the plate flat surface 9.

The second plate 6 is provided with a peripheral flange 7 having an L-shaped cross section on its peripheral edge, and the tip thereof is bent to wrap the peripheral flange 5 of the first plate 4 to form a flat tube 8 by caulking. Openings 15 and 16 are formed at both ends of the flat portion 14 of the second plate 6 and have a long oval shape in the front-rear direction, and the front and rear ends in the longitudinal direction approach the front and rear edges of the flat portion 14. Opening flanges 17, 18 are provided.

The tubes 8 are overlapped by a required number of steps, and the opening flanges 12 and 13 and the opening flanges 17 and 18 of the other tubes 8 are fitted to each other. If necessary, a first corrugated fin 19 that guides the fluid is installed between the rows of openings 10 and 15 and the rows of openings 11 and 16 in each tube 8, and the fluid is applied in the front-rear direction in the space between the tubes 8. The second fin 20 having a corrugated shape is attached. The wave height of the first fin 19 corresponds to the step a, and the wave height of the second fin 20 corresponds to the step b.

The first and second plates 4 and 6 and the first and second fins 19 and 20 assembled as described above are integrally molded by brazing, and the opening 11 at the bottom is closed by the closing plate 21. Is brazed, fixed and closed. In this case, it is preferable that the widths of the openings 11 and 16 are about twice the widths of the openings 10 and 15 so that the areas of the inflow opening and the outflow opening are substantially equal. The lowermost first plate may not have the opening 11. If the uppermost second plate has an opening to be closed, the opening 15 or 16 may not be provided in advance.

The heat exchange core 1 is appropriately attached to a frame-shaped attachment member, and if necessary, an outlet or inflow duct is attached to the openings of the upper and lower surfaces that are not closed, and front and rear surfaces are hood-like ducts that cover the front and rear surfaces. Are attached to form heat exchangers as inflow and outflow passages for the first and second fluids, respectively. For example, the first fluid passing through the tube 8 is used as combustion air for the gas turbine, and the second fluid passing between the tubes 8 is used as exhaust gas of the gas turbine, and the heat exchange core 1 is used as heat of the exhaust gas recovery type air preheater of the gas turbine. Used as a replacement core.

[0016]

[Effect of device]

 The heat exchange core of the present invention forms a tube by caulking the entire circumference of a dish-shaped plate and uses the inside as one fluid flow path to form an opening flange to form a laminated body and use the opening flange to make the other side. Since it is a side wall of the fluid, it is easy to make close contact during brazing and there is almost no risk of leakage of the flow path. In addition, it is lightweight because all flow paths are formed only by the plate without using a blocking bar or the like.

Further, since the communication passages inside the fluid flowing in and out on the upper and lower surfaces are both side ends of the plate and do not obstruct the flow path of the other fluid, the pressure loss can be extremely reduced.

[Brief description of drawings]

FIG. 1 is a sectional view of an example (A-A plane in FIG. 3).

FIG. 2 is another sectional view of the embodiment (plane BB in FIG. 3).

FIG. 3 is a perspective view showing a tube of an embodiment.

[Explanation of symbols]

 4 1st plate 5, 7 Peripheral flange 6 2nd plate 9, 14 Flat part 10, 11, 15, 16 Opening 12, 13, 17, 18 Opening flange

Claims (1)

[Scope of utility model registration request] 1. A peripheral flange having a step higher than the flat portion is provided around the flat portion having a substantially rectangular shape, and oval openings elongated in the front-rear direction are provided at both ends of the flat portion. An opening flange that is lower than the flat part and provided with a step is provided as the first plate, and peripheral flanges are provided around the flat part that has a rectangular shape that is substantially the same size as the first plate, and both sides of the flat part are long in the front-rear direction. A circular opening is provided to form the second plate, the second plate is placed on the upper surface of the first plate, and both peripheral edge flanges are caulked to form a flat tube.
A plurality of tubes are overlapped and the lower end of the opening flange is fixed to the opening peripheral edge of the upper surface of the other tube, and one of the four ends of the upper and lower ends of both ends is one side end or both ends 1
A laminated heat exchange core made by closing each piece.