JPH0217256B2 - - Google Patents

Description

Claim 1: A method for crushing a portion 20 of the corrugated plate 10 in a region extending transversely to the corrugated surface without blocking the passage 14 between the ridges 12 of the uncollapsed portion of the corrugated plate 10. Then, floor plan members 58, 60, 62, 64, 66, 7 are installed in the passageway 14 in the transition area 24 between the unsqueezed area and the remainder of the area to be crushed.
8, 80, 82, 84, 86, and 88, and the method is characterized by continuously crushing the ridge until the ridge is further crushed than the previous stage of crushing and the ridge at the transition area becomes flat. .

2. A process for providing relative movement between the corrugated plate 10 and a plurality of successively spaced crushing stations to successively move the ridges 12 to the crushing stations. The method described in.

3. The method of claim 1, wherein each of the crushing stations includes a step of simultaneously crushing the top ridge 12 and the bottom ridge 12 of the corrugated plate 10.

4. The method according to claim 1, wherein the remaining portion of the portion 20 to be crushed is crushed without using the floor plan member.

TECHNICAL FIELD This invention generally relates to heat exchangers.
In particular, it relates to a method for flattening thin metal plates used in such heat exchangers.

BACKGROUND OF THE INVENTION Early planar heat exchangers incorporated corrugated or folded alloy plates to create passages on both sides of the thin alloy plates. These passages direct the flow of air and hot gas, prevent air from entering the gas passages, and
It played a role in directly transferring heat. The corrugations of the alloy plates also serve to support adjacent alloy plates within the heat exchanger.

Before assembling each alloy plate, these ends are
It is collapsed to form a flat pipe buckle to facilitate liquid flow. These tube baffles at each end of the alloy plate receive or direct gas or air from or toward the appropriate passages of the heat exchanger.

The above type of stacked plate heat exchanger is manufactured by Henry J.
No. 3,759,323 to Dowson et al. When assembling this type of heat exchanger, it is necessary to flatten the pipe bends.
As the corrugations within the tube baffle flatten, the corrugations become larger and often completely or partially block the liquid passage in adjacent corrugations, and attempts to eliminate this problem have been unsatisfactory. . For example, a comb-like device was used to open a blocked passage after crushing the corrugations in a pipe tie, but since the blockage spaced irregularly, the comb-like device was used to open a blocked passage. The attached comb-like device will not only remove the obstruction, but will further strengthen the obstruction. Furthermore, since the alloy plates are arranged in an alternating wave pattern, the blockage does not completely block the liquid, but there is a problem in that an excessive amount of heat exchanger material is used.

DISCLOSURE OF THE INVENTION The present invention provides a new method for flattening corrugated heat exchanger plates forming tube bends by collapsing the corrugations at the transition between the liquid passageway and the tube bends. The purpose is to

In order to flatten the wavy heat exchanger plate to form the pipe bends, opposing die-shaped members are used during the crushing operation to crush the corrugations at the transition areas between the pipe bends. It is an object of the present invention to provide a method for flattening a corrugated heat exchanger plate, characterized in that a floor plan member is provided that is maintained on both sides of the corrugation and limits the ability of the corrugation to expand or bulge outward. .

[Brief explanation of drawings]

FIG. 1 is a plan view of a corrugated heat exchanger plate to be flattened to form a tube tie according to the invention.

FIG. 2 is a diagrammatic illustration of a die-type assembler of the present invention receiving a movable heat exchanger plate.

3 is a cross-sectional view of a die set used for the die assembler of FIG. 2; FIG.

FIG. 4 is a detailed view of the detent switch used in the die-type assembler of FIG. 2.

FIG. 5 is a circuit diagram of the control circuit of the die-type assembler of FIG. 2.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to the drawings, FIG. 1 shows an alloy plate or thin metal corrugated with raised ridges having fins 12 or crowns defining an intermediate passageway 14. A corrugated heat exchanger plate, generally indicated at 10, formed of plates is disclosed. Broken line 16 in FIG.
18 indicates the tube bends 20, 22 which must be formed on either side of the central corrugation by flattening the corrugations at the tube bends. In the past, this flattening operation closed the passageway 14 near the dashed lines 16, 18 due to expansion or expansion when the crown 12 was collapsed.

By the method of the present invention, the tube tie portions 20, 22
The flattening can be carried out without substantially occluding the passageway 14, and the respective individual transitions 24, 26 within the transition areas 24, 26 bounded by the dashed lines 16, 18 and the dashed lines 28, 30 spaced apart from these, This is done by crushing the crown 12. Each crown in the transition zone is individually subjected to a plurality of successive crushing steps while each crown is flattened. During each crushing operation, the supporting blades of the die set are inserted into the passageways 14 on either side of the crown, acting as spacers to prevent the crown from expanding outwardly. Once, transition part 2
Once 4, 26 are completely flattened, the remainder of the external tube buckling region of the transition region can also be easily flattened in a conventional manner.

To flatten the corrugations in the transition areas 24, 26, the corrugated heat exchanger plate 10 between opposing die members of the die set mechanism closes the alloy plate once each time.
This is done by sequentially supplying Also, at this time, the plate moves a distance equal to the distance between two adjacent crowns 12. As the crowns move under the die members, they are always received in the slots with decreasing depth as the die member closes. at least one crown between the first crown to be crushed and the next adjacent crown;
Two passageways 14 receive a die-shaped support blade extending into the passageway for full depth to act as a locator blade following the die-shaped set blade. The locator blade further stabilizes and strengthens the heat exchanger plate 10 during the flattening operation.

A schematic diagram of a new die-type assembler 32 constructed according to the present invention is shown in FIG. This assembler includes an upper die 34 and a lower die 36 that are moved by upper and lower hydraulic cylinders 42, 44. These upper and lower die molds 34, 36
The cylinder 4 is connected by the rod members 38 and 40.
It is connected to a hydraulic piston in 2,44.
However, other suitable known drive devices may be used for the upper and lower dies.

The rods 38, 40 of the hydraulic cylinders 42, 44 are controlled by a die-type control circuit 46 which controls the valves within each cylinder. When this rod presses the upper and lower dies 34, 36 together, the crown 12 on the heat exchanger plate 10 is crushed.

The heat exchanger plate 10 is fed between the upper and lower dies by suitable drives such as rollers 48, 50 driven in opposite directions. Ideally, the operating times of the upper and lower dies should be accurate so that the heat exchanger plates 10 can be applied continuously. During this time, switches 52, 54, 56A, 56B
is achieved.

To understand how the die assembler 32 operates, it is first necessary to consider the structure of the upper and lower die shown in FIG. The surface of the upper die mold 34 is
Slots 68, 70, 72, 74, 76 and a plurality of continuous blades 58, 60, 62, 64, 6
6 is formed. Similarly, the face of the lower die 36 has slots 90, 92, 94, 96, 98 and a plurality of blades 78, 80, 82, 84, 8.
6,88 is formed.

When the upper and lower die molds are combined, the blade 80
~88 go into slots 68~76, respectively, while
Blades 58-66 enter slots 90-98, respectively. What should be noted here is that the heat exchanger plate 10
This means that some clearance remains between the blade and the slot that is received to accommodate the blade.

The heat exchanger plate 10 is fed between the upper and lower dies 34, 36 from the left in FIG. Blade 58,7
8 and 80 form the entry blades, these are the first blades to enter the passages 14 in the heat exchanger plate as the plate moves between the dies. Blade 58 enters a passage on the top side of the plate while blades 78, 80 enter respective passages on the bottom of the plate. The entry blades and their receiving slots 68, 90 are of sufficient size to receive and support the heat exchanger plates without crushing the crown 12. Optionally, a second, fully sized slot and blade combination 60, 92 is provided in which the upper and lower passages 14 are supported by two blades on either side of the heat exchanger plate 10 at the entry end of the soybean mold set. be done.

Slots 70, 7 in upper die 34
2, 74, 76 and the slots 94, 96, 98 in the lower die 36 are of varying depth such that the slots 76, 98 at the exit end of the set of dies are very shallow. In this manner, the crown 12 of the heat exchanger plate collapses as it moves through the increasingly shallow slots.

Importantly, the individual passages 14 in the top of the heat exchanger plate 10 guide the blades 58, 60, 62, 64 and 66 as the corrugated plate progresses from the entry to the exit end of the die set. It is to accept it clearly and continuously. Also, at the same time, adjacent passages on the bottom side of the heat exchanger plate include blades 78, 80,
82, 84, 86, and 88 are accepted consecutively. This is accomplished by causing the die control circuit 46 to actuate the die cylinders 42, 44 to close the upper and lower die 34, 36 when the heat exchanger plates are in the correct position. This is because this operation is carried out under the control of the stopper switch 52 which performs the action of activating.

The structure of the stopper switch 52 is explained in detail in the fourth section.
The details are clearly shown in the diagram. This switch includes a catch ball 104 mounted on a spring arm 106 that biases the ball downwardly against a crown 12 on the heat exchanger plate 10.
It is. The ball consists of two conductive hemispheres 108 electrically separated by a central insulating piece 112;
It consists of 110. Conductor 114, 11
6 are each coupled to one of the conductive hemispheres so that the ball is guided through the passage 14 as shown in FIG.
When pushed into the heat exchanger and conductor hemisphere 10
8,110 to complete an electrical circuit between the conductors. When the ball does not contact the crowns 12 on either side of the passage 14, the conductor 11
The electrical circuit is not completed for 4,116 days.

The dice-shaped control circuit 46 connects both transition parts 24 and 26.
The structure and operation of the dice-shaped control circuit 46a shown in FIG. 5 are the same, and this circuit includes the cylinder 42 (FIG. 2).
Input terminal 1 for supplying power to control the operation of
18, 120 and input terminals 122, 124 that power the support circuitry. These input terminals may be connected to the same or separate power supply, such as a battery power supply 140.

The electrical circuit is connected to conductor 1 by the lock switch 52.
Terminal 1 across the detent switch which, when completed between 14 and 116, closes the relay contacts 128 and energizes the retention relay coil 126 to continue to maintain the retention relay operating in the "hold" position.
Power is supplied from 18. Current from the holding relay is applied to the cylinders 42, 44 by a solenoid 13 that controls a valve or other control member.
0A, 130B and die type piston rod 3
8, 40, solenoid 130
A, 130B returns to terminal 120 through closed contact 134.

After initially closing contacts 138 by briefly closing switch 54 that energizes coil 136, the support relay containing support relay coil 136 is energized from terminals 122 of normally closed switches 56A, 56B. One part is the contact 134. At the end of each die stroke, switch 5
6A and 56B open.

Industrial Applicability The heat exchanger plate 10 is moved between the upper and lower dies 34, 36 by drive wheels 48, 50. Switches 56A and 56B are normally closed, but switch 54 is open. Therefore, the holding relay coil 136 is energized by the normally closed contacts 134 and 138.

Since the heat exchanger plate is in the correct position for crushing action, detent switch 52 momentarily closes, energizing retaining relay coil 126 and closing contact 1.
Close 28. The current passes through contact 128 to terminal 11.
8, through coil 126, then through control solenoids 130A, 130B and contacts 134, and back to terminal 120. Solenoid 130A, 1
Activating 30B extends die piston rods 38, 40 relative to cylinders 42, 44 and drives dies 34, 36 together. Rod 3
When 8, 40 reaches the outer end of its transition, switches 56A, 56B momentarily open, deenergizing support relay coil 136. This is contact 134,1
38 and control solenoids 130A, 130B.
and deenergizes the support relay coil 126. Deenergizing the control solenoid causes rods 38 and 40 to uncouple upper and lower dies 34 and 36 and reclose switches 56A and 56B. During the transition of the corrugated plate to the next passage, switch 54 is normally closed; this switch 54 is similar to switch 52, but is in the closed position during the transition of the plate, and before switch 52 closes. then affects the stroke of the die shape. Switch 54 is located at about a different path pitch than switch 52, so that movement of the plate alternately engages switches 52 and 54. This allows switch 54 to actuate the die stroke to ensure that switch 54 closes in front of the passageway in position for switch 52 to close.

The detent switch 52 is closely adjacent to and spaced relative to the blades 58, 80 at the entrance end of the die set so that these entry blades are It serves as a locator for the remaining blades in the blade. Each time, the detent switch connects two adjacent crowns 12, the die sets become integral, and the blades formed on each side of the opposing die enter the passages 14 that are aligned therewith. The slots 70-76 and 94-98 collapse the received crown while the interfering blades prevent the collapsed crown from expanding and blocking the passageway 14. Each crown is subjected to a plurality of separate successive crushing actions until either slot 76 or 98 is reached. These final exit slots are extremely shallow so that the transitions 24, 26 can be sufficiently crushed. After these metastatic areas are completely crushed,
The remainder of the tube tie sections 20, 22 are collapsed in a conventional manner.

The blades on each side of the upper and lower dies 34, 36 are formed to match the configuration of the passages 14 in the heat exchanger corrugated plate 10. Therefore, as shown in FIG. 1, when the passage exhibits a corrugation in its shape to promote heat transfer, the blade will have a similar shape corresponding thereto, and also in the corrugated plate on one side. If the passage changes in width from the opposite passage, the width of the blade will also change accordingly. In this manner, the blades at the face of the lower die 36 are wider than the blades at the face of the upper die 34, as shown in FIG.

The methods and equipment used to form the metal plates used in the heat exchanger are as described above.