FI65391C - ANORDING FOER ATT FORMA UPPVAERMNINGSELEMENT MED HJAELP AV HYRAULISKT TRYCK - Google Patents

Description

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J® * lBJ «”) utlAggningsskrift 65391 C (45) raU: .U! '- / 10 05 1984 ^' '(51) K * .tk? Flnt.a. 3 B 21 D 26/02, B 30 B 15/00 FINLAND — FINLAND (») i ^ ik ^ -itaiMmtk ^ 2U87 / 72 (22) H» k * ml »p4hri - AmMaiinpdag 08.09.72 ^ '(23) Alkupllvt-Gllti | hat * da | 08.09.72 (41) Tullut | ulklMlcj | - Bltvlt offwtllf l8.07.73

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Patent- och raglsterttyralaan 'Anaotun utbfd och uti. * Krifun pubticorad jU.UL.oa (32) (33) (31) Pjrrd * tty «« oik · * —teginl priority 17.01.72 USA (US) 2l81 | 29 (71) ) Rosenblad Corporation, P.0. Box 2325, Princeton, New Jersey 085 ^ 0, USA (72) Ernest Sigvald Fabri, Willingboro, New Jersey, USA (7 * 0 Berggren Oy Ab (5 * 0 Apparatus for forming heating elements by hydraulic pressure - Anordning This invention relates to the manufacture of heat exchanger elements having channels for the flow of heat exchanger fluid formed between opposing pairs of plates, and more particularly to an apparatus or device for use in the manufacture of such heat exchanger elements.

U.S. Patent No. 3,512,239 discloses a method of making heat exchange elements formed from well plates by hydrostatic pressure. This patent contains a device that can be used in connection with my method, however, practice has shown the existence of certain disadvantages when using such a device.

In the manufacturing apparatus disclosed in U.S. Patent No. 3,512,239, a pair of opposing plates is interposed between a rigid and resilient support element. When the flexible element contains a metal film, the film must be designed and maintained very carefully to prevent it from entering a fixed position, which would make it impossible to remove the heating element after manufacture. The device according to said patent also does not allow over-loading 65391, and during manufacture, error alignments and corresponding errors can always occur when inserting molds and heating element blanks into the device.

Prior to the above-mentioned patent, the plates of said types of heat exchange elements were individually made mechanically by means of heavy and expensive printing machines using special molds. The private plates then had to be carefully aligned and joined together. U.S. Patent No. 3,512,239 was a significant advance in the art, however, an even better manufacturing device was required.

The apparatus for manufacturing heat exchanger elements according to the present invention comprises a fixed base part and a top part which moves on the base part like a carriage running on rails after the cover formed by flat plates connected by a circumference has been placed in the base part. The fixed base includes an upwardly opening rectangular box with a fully inflatable bag. The piston plate in this bag moves in a vertical direction. The piston plate supports a lower studded plate with the pins facing up.

The cover, which can be expanded by means of hydraulic pressure, rests on the pins of this plate, and a symmetrically placed upper pin plate, the pins of which point downwards, is placed above the cover. The movable top with its carriage can be easily moved to its position on the upper pin plate.

After the top of the device is moved into place, the cover is expanded by passing a pressurized fluid between a pair of plates of the cover. The plates are separated from each other everywhere except at their edges and where the pins hold them.

The use of a flat piston plate according to the invention, supported by an inflatable bag of filling, results in an even distribution of pressure over the entire surface of the heating element. The sliding top makes it easier to place the expandable cover as a heating element and to remove the expanded element. Charging the device from the top saves a lot of time. The device can be easily disassembled for maintenance if necessary.

The features of the invention appear from the claim. These and other features of the invention will become more apparent from the following detailed description of a preferred embodiment of the invention with reference to the accompanying drawings, in which Fig. 1 is a side view of a structural body and carriage arrangement of a preferred embodiment of the invention, Fig. 2 shows an end view of the arrangement of Fig. 1. , 3 shows a detailed cross-section of a part of the device according to the invention before inflating the inflatable bag, Fig. M is approximately a detailed cross-section according to Fig. 3 after inflating the bag, but before expanding the cover to form a heating element, Fig. 5 is a detailed cross-section similar to Figs. showing the conditions after the expansion of the cover, Fig. 6 is a perspective overview of the cover from which the heating element can be formed by means of the device according to the invention 1a, Fig. 7 is a perspective overview of the final heating element made by means of the device according to the invention.

The device according to the invention, generally indicated by reference numeral 10, is shown in Figure 1 as a side view and in Figure 2 as an end view. The fixed base part 11 of the device 10 is supported by a strong frame 12, which is preferably made of structural steel with rigid supports 13 »which support a longitudinal parallel pair of rails or rails 14.

The carriage 15, which includes the top 16 of the device 10, has a plurality of metal wheels 17 for moving on the tracks 14 from the rest position shown in dashed lines on the left in Figure 1 to the operating position on the right in Figure 1. When the carriage 15 is in its operating position, the upper part of the device 10 is directly above the fixed base part 11, as best seen in Figure 2.

Detailed Figures 3-5 show the interaction of the parts of the device 10 in forming the heating element. The cross-sectional area of these figures corresponds to the upper left of Figure 2. The base portion 11 of the device 10 has a generally rectangular protrusion 20 extending horizontally along each side 21 to control the sliding movement of the top 16 cooperating with horizontal grooves 22 formed in the inner surfaces of the downwardly extending side pawls attached to both sides of the carriage 15. The grooves 22 are generally rectangular in cross-section, extending horizontally along the entire length of the side pieces 23.

The side pieces 23 can be suitably connected to the generally rectangular flat body 24 of the upper part 16 by means of the tongue and groove connection shown in FIG. 25 and also to ensure the connection with suitable screws 26 at certain intervals along the length of the upper part 15. The side pieces 23 also have bolts 27 which act as axles for the wheels 17. The wheels 17 are preferably arranged at certain distances along the upper part 16 for movement along the tracks 14 on each side of the carriage 15.

65391

The body 2M of the upper part 16 is strong to withstand the pressures generated during the manufacture of the heating elements and has a flat lower surface 30. The bottom part 11 of the device 10 has a generally rectangular vertical edge 31 around its circumference, the edge surrounding an upwardly opening box-like space 32. the lower surface 33 and the vertical flat walls 3M formed by the inner surfaces 3M of the edge 31.

As shown in Figures 3-5, the space 32 includes a fully inflatable bag 35, which may be made of rubber or other suitable material. The bag itself has a rectangular bottom section and is suitably sized to cover the flat surface 33 of the space 32. Figure 3 shows the bag 35 in the normal empty position in which it is when the device 10 is loaded.

Directly above and over the bag 35 is a flat, rigid piston plate 36 which is rectangular in cross-section and slightly smaller than the bottom surface 33 of the space 32 for its free movement up and down inside the edge 31 as the bag 35 is filled and emptied. Figure 3 shows the piston plate 36 in its lower position. In this position, the plate 36 is completely inside the box-like space 32, its flat upper surface 37 being parallel to the lower surface of the upper part 15. The distance between the surfaces 30 and 37 is sufficient for receiving the expandable cover MO as a heating element and for a pair of upper and lower plate plates M1 and M2 acting as counterparts as described in the manufacturing process. The pin plates M1 and M2 can be suitably made of aluminum.

The bag 35 can be inflated in any suitable manner (not shown in the drawings). Such blowing devices may include a hydraulic pump in communication with the bag 35 at one end of the lower portion 11 so that the connection hose or the like does not interfere with the movement of the upper portion 16.

Reference is now made to Fig. 6, which shows a cover which can be expanded into a heating element according to the invention. The cover MO contains a pair of compatible symmetrical metal plates MM and M5 welded together at their edges M6 as best seen in Figure 5. The connection M6 between the plates MM and M5 is tight, leak-proof and pressure-resistant, extending all over the cover MO everywhere except at one point, marked M7, with a nozzle M8 for conducting pressurized water between the plates MM and M5 to spread the plate parts apart as will be described later. The final heating element is shown in Figure 7.

5 65391

Returning to Figures 3-5, the purpose of the pin plates * 41 and * 42 is understandable in relation to the cover * 10. The top and bottom plates * 41 and * 42 are preferably identical in shape, so only the bottom plate * 42 will be described. The pin plate * 42 is generally rectangular in cross-section and slightly larger in area than the rectangular space 32 formed inside the edge 31, so that the pin plate * 42 rests on the edge 31 at all its edges * 48. Thus, as shown in Fig. 3, the plate * 42 can be placed above the bag 35 and the studded piston plate 36 by placing the plate * 42 centrally on the piston plate 36. The plate * 42 generally includes a flat top surface * 49 from which protrudes: a plurality of pins 50 upward at certain intervals in the desired order. Each pin 50 is slightly rounded with flat ends 51 for contact with the cover * 40. The pins 50 may be circular in cross-section, as in the illustrated embodiment, or otherwise in a desired shape, such as longitudinal or oval. In this connection, reference is made to said U.S. Patent No. 3,512,239 for various shapes of pins. The pins 50 can be welded directly to the plate * 42 or attached to it in some other suitable way.

The top plate * 41 has a corresponding pin arrangement 50a so that when the plate * 41 is inserted, the downwardly directed pin 50a is pressed against the cover * 40 against each upwardly directed pin 50 in a corresponding position.

The use of the device 10 in the manufacture of the heating elements shown in Fig. 7 allows the tip load and removal of the elements as well as the precise setting of the pins 50 and 50a. In the normal manufacturing process, the carriage 15 runs along the tracks 1 * 4 to the position shown on the left side of Figure 1. This leaves the fixed base part 11 of the device 10 open for loading. The lower studded plate * 42 can then be placed above the piston plate 36.

The next step is to place the cover * 40 on the pins 50 of the lower pin plate * 42 and the upper pin plate * 41 on the cover * 10 with the pins 50a of the upper pin plate symmetrically above the pins 50. This arrangement is easily achieved, as no obstacle prevents the placement of the cover * 40 and the plates * 41, * 42. By moving the carriage 15 to the operating position shown in Figure 1 and connecting a hydraulic pump, the device is ready for operation.

In Figure 3, the empty inflatable bag 35 is then inflated. The piston plate 36 on top of the bag 35 begins to move upward when blown into the bag. This upward movement in turn moves the pin plate * 41, * 42 and the cover 6 65391 40 therebetween until the upper pin plate 41 engages the surface 30 of the top 15, as shown in Figure 4. The cover 40 is fully flattened at this stage even in the event of buckling when welding its two opposite plates 44 and 45. A comparison of Figures 3 and 4 shows how the protrusion 20 is forced to rest on the bottom of the groove 22 to prevent further upward movement or separation of the tip and bottom portions 15 and 11 of the device 10. .

The next step in the manufacturing process is to expand the casing 40 by passing pressurized water through a nozzle 48. The conduction of water takes place under pressure until an internal pressure is reached which slightly exceeds the yield point of the coating material. The pressure of the fully inflated bag 35 must be greater than the internal pressure of the cover 40. By using stainless steel elements in plates 44 and 45 2 (18 caliber steel), an internal pressure of about 35 kp / cm has been achieved. In this case, a suitable blowing pressure of the bag 35 is about 39 kp / cm 2.

This pressure expands the cover 40 to the shape shown in Figure 5 with the plates 44 and 45 spaced apart from each other except at the welded circumference 46 and at points where the pins 50 and 50a prevent expansion. The use of a pressure slightly above the yield point of the material causes the material to settle evenly around the ends 51 of the pins.

The pressure of the expanded cover 40 and the bag 35 is released when the cover has reached the shape shown in Figure 6. The piston plate 36 then moves down to the position shown in Figure 3. The upper part 16 then returns to its rest position shown on the right in Fig. 1, leaving the pin plates 41 and 42 with their expanded elements 40 between them open. The heating element 40 and the plates 41 and 42 can then be removed from the device 10.

The expanded element 40 has become in the shape shown in Fig. 7. Opposite cavities in the plates 44 and 45 at points where the material was prevented from expanding can be spot welded together to provide the necessary strength to the heating element, which includes internal passageways for fluid flow between the interconnected cavities 60.

It is clear from the above that the device according to the invention constitutes a means for the simple and economical manufacture of submersible plate heat exchanger elements. It is possible for those skilled in the art to make numerous modifications and applications to the device according to the invention without departing from the principle and scope of the invention.

Claims (1)

Apparatus for manufacturing heat exchange elements consisting of two opposing plates spaced apart by opposing inwardly directed protrusions, the apparatus comprising a fixed base portion (11) and rails formed thereon on its rollers laterally on or off the workpiece, a movable top portion (16) between the side parts and the fixed base part there is a stop arrangement formed by a horizontal groove and a ridge loosely moving therein for transmitting a compressive force of the working step between the base part and the upper part. 35) on which a movable piston part (36) known per se is formed in the base part (11) and the device also known per se also has two plates (4l) provided with pins (50, 50a). , 42) for placing an element blank (40) therebetween, and that said rollers on both sides of the top (16) are attached to the lower ends of the side portions (23), and that said groove (22) and ridge (20) are provided only on said side portions (23). to opposite vertical surfaces of the inner surfaces and the side surfaces of the base. Anordning för tillverkning av värmeväxlarelement, vilka be-stär av tvä varandra motstäende plattor ätskilda av varandra mot-stäende inät riktade utspräng, varvid anordningen omfattar en fast bottendel (11) ooh en övre del (16) som är förskjutbar i sidor arbetsstycke eller i riktning bort frän det längs skenor som anordnats i den fasta bottendelen (11) stödd av sinä rullar, mellan vilken övre dels (16) sidodelar och den fasta bottendelen anordnats ett mothällsarrangemang som bildas av en horizontell slits ocits Arbets-skedets Arbets-skedets kompressionskraft mellan bottendelen ocen den övre delen, vilken kompressionskraft ästadkommes genom att spänna ut den fjäd-rande väggen mellan nämnda delar med tryckmedium, kän nne -tecknad av att utrymmet som begrän och för sig känt fyllbart fjädrande element (35) ovanpä vilket befinner sig en i och för sig känd rörlig pistv-del (36) anordnats 1 bottondeln n (11) and anordningen uppvisar