JPH0141033Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Field of Application) This invention relates to a heat exchange element having overlapping plates.

(Prior Art) Conventionally, a multi-plate type heat exchanger has been used for relatively high pressure and high temperature applications such as oil coolers for internal engines, and is disclosed in Japanese Utility Model Application No. 140787/1987. For example, a heat exchange element 31 as shown in FIG. 7 accommodates fins 35 (FIG. 8) and caulks an upper plate 33 and a lower plate 34 to form a plate assembly 32. The tubes 36 are stacked alternately, and the through holes 37 of the plate assembly 32 and the short tubes are connected and fixed. Further, a blind plate/reinforcing plate 38 is fixed to a portion of the lowermost stage where the fin is missing corresponding to the through hole 37.

(Problem that the invention aims to solve) The multi-plate heat exchanger as described above has separate fins between the upper and lower plates that serve both for reinforcement and heat transfer, and short tubes and reinforcing plates that maintain the spacing between the plate assemblies. etc., the number of parts is large, the structure is complex, and the weight is large. Moreover, since the contact surface with the cooling fluid is the flat surface of the plate, it is difficult to maintain the flow path spacing of the cooling fluid between each layer and increase the heat transfer area within a certain capacity.

(Means for solving the problem) This invention is intended to solve the above problem, and it abolishes the conventional distinction between upper and lower plates,
This structure eliminates the need for separate short fin tubes and reinforcing plates, and the flow path for two fluids is formed by stacking plates of the same shape. Its composition is as follows.

That is, a plurality of plates are formed by providing a plurality of parallel grooves on a flat surface, through-holes are bored at both ends of the groove bottom, and a plurality of rows of slit openings are provided in the middle of the groove bottom, and the side walls of each groove are joined together. The flat surfaces are overlapped with appropriate intervals between them, and a cover covering the upper surface of the groove and having openings communicating with the through holes at both ends is fixed on the top layer, and a cover on the bottom layer is provided with a cover that covers the top surface of the groove and has openings that communicate with the through holes at both ends. This is a heat exchange element consisting of fixed end plates that close through holes and slit openings.

(Function) The above-mentioned heat exchange element is often housed in a casing having an inlet/outlet for a cooling fluid (for example, water), or is used immersed in a cooling fluid. The liquid to be cooled (for example, lubricating oil for an internal combustion engine) enters through one opening in the cover, flows to the lower layer through one corresponding hole in the plate, and a portion flows in the groove in the plate, and flows through the hole in the other end. reach the hole. The grooves in each layer are cut and raised by the slits on the bottom and form a row of openings, so the flow to be cooled in the grooves passes through the slit openings and becomes a turbulent flow, coming into contact with the side walls, and some exchanges between the upper and lower layers occur. It is done. In this way, it reaches the through hole at the other end of each layer and is sent out from the other opening of the cover. The bottom surface of the lowermost plate is closed with an end plate.

On the other hand, in most cases, the cooling liquid flows inside the casing that houses the heat exchange element, but regardless of whether there is a casing or not, the cooling liquid flows around the heat exchange element and comes into contact with the outer surface of the side wall of the groove of the plate, causing the coolant inside to cool. Take away the heat.

(Example) As an example of this invention, a plate 2,
Figures 2 to 4 show the heat exchange element 1 of this invention.
shows. The plate 2 is made of a thin metal plate, and a plurality of parallel grooves 4 are formed on a flat surface 3, and a number of slits 5 are cut into the bottom surface of the plate 2, and slit openings 6 are formed by bending the plate 2 into an uneven shape. Figure) An inlet hole 7 and an outlet hole 8 are bored at both ends of the bottom surface of the groove 4. Such plates 2 are stacked and the side walls 9 of the grooves are joined to each other, and the flat parts 3, 3 of the plates 2 are stacked.
are kept parallel to each other at appropriate intervals. A lower end plate 10 is fixed to the lowermost layer to close the through holes and slit openings of the lowermost plate. At the top, there is an upper end plate 11 having through holes 12 and 13 corresponding to the through holes 7 and 8 of the plate, a gear lary 15 having an opening 14 that communicates the through hole 12 with the outside, and a gear lary 15 that communicates the through hole 13 with the outside. Gear rally 17 with opening 16
A cover 18 consisting of is fixed.

This heat exchange element 1 normally has a water inlet 21 and a water outlet 22, and is used housed in a casing 20 whose open end is fixed to the upper end plate 11.

Cooling water enters through the water inlet 21 , contacts the outer surface of the side wall 9 of the plate within the casing 20 and is discharged through the water outlet 22 . The liquid to be cooled (oil) enters the gearbox 15 through the opening 14, is distributed to each through hole 12, and flows to the next layer via the inlet hole 7 of the plate, while a portion passes through the groove 4 and the slit opening 6. The flow becomes turbulent. In this way, the liquid to be cooled flows through the outlet hole 8, the hole 13, and the opening 16 of the gear assembly 17.
The data is sent to the outside through the process.

(Effects) The heat exchange element of this invention does not require separate fins, short tubes, reinforcing plates, etc. unlike the conventional multi-plate type. Since it is formed into plates and stacked with identical shapes, it is lightweight, has a small number of parts, and is simple and easy to assemble.
Since the cooling water flow path comes into contact with the liquid to be cooled through the plurality of groove side walls, the heat transfer area can be increased within the same volume due to the groove shape.

[Brief explanation of the drawing]

FIG. 1 is a plan view of the plate of this invention, FIG. 2 is a plan view of the heat exchange element, FIG. 3 is a front view thereof, and FIG. 4 is a partial sectional view of the side. Fifth
The figure is a sectional view of the groove portion of the plate, and FIG. 6 is a sectional view of the flat surface portion. FIGS. 7 and 8 are diagrams showing conventional products. 2...Plate, 4...Groove, 6...Slit opening, 7, 8...Through hole, 10...Lower end plate, 11...
Upper end plate, 15, 17...Geararari.

Claims (1)

[Scope of utility model registration request] A plurality of plates each having a plurality of parallel grooves on a flat surface, holes bored at both ends of the groove bottom, and a plurality of rows of slit openings in the middle of the groove bottom are joined to each other by joining the side walls of each groove. The flat surfaces are overlapped at appropriate intervals, and a cover is fixed to the top layer that covers the upper surface of the groove and has openings that communicate with the through holes at both ends, and the bottom layer has the through holes of the plate and A heat exchange element made of a fixed end plate that closes the slit opening.