JP2006506597A - Heat exchange device between fluid media - Google Patents

Abstract

The present invention relates to a heat exchange device between fluid media. The heat exchange device has a heat exchange block with one side attached to the inlet chamber (1) and the other side attached to the outlet chamber (3) for inflow and outflow of the fluid medium. ing. The heat exchange block has a fluid passage (7) for the fluid medium and a cover plate (9), the fluid passage (7) from the inlet chamber (1) to the outlet chamber (3). Extending through a heat exchange block, the cover plate (9) covers the fluid passage (7) and the flow path (8) and from the inlet chamber (1) to the outlet chamber (3). ). The cover plate (9) has at least one internal flow path (13) bypassing the fluid passage (7), the internal flow path (13) from the inlet chamber (1) to the It extends as a bypass channel to the outlet chamber (3). The flow path can be blocked by at least one pressure regulating mechanism (11) and a pressure differential acting between the inlet chamber (1) and the outlet chamber (3) above a predetermined threshold. Accordingly, the blocking can be released by opening the pressure adjusting mechanism (11).

Description

  The present invention relates to a heat exchange device between fluid media in which at least one is in a fluid state.

  Known devices (Patent Document 1) that achieve the function involved in the heat of the moving fluid are widely used in the art, especially in liquid / air coolers. When such a device is used in combination with a hydraulic assembly or production facility, cooling air is used to cool the working fluid such as hydraulic oil, lubricant or cooling lubricant and is cooled. Care must be taken to prevent equipment outages or damage caused by the temperature dependence of the fluid viscosity. In order to maximize the efficiency of heat exchange, a blade or plate is installed in the flow path through which the fluid cooled inside the device flows, and the blade or plate generates turbulent flow around it. The fluid is swirled during the flow process so that all components of the fluid flow are in contact with the wall surrounding the flow path.

  The structural member that produces the swirling action is constricting a substantial amount of fluid flow, so that the pressure differential due to the restriction is provided between the inlet chamber and the fluid outlet chamber on the fluid inlet side to be cooled. If the viscosity of the fluid to be cooled is remarkably temperature dependent, the viscosity of the fluid is correspondingly increased in operating conditions where each fluid is at a low temperature, for example at start-up when the working fluid is at a low temperature. Excessive pressure rise results as a result of throttling in the flow path. In order to prevent the occurrence of such pressure rises resulting in loss of function or damage, a bypass flow mechanism is usually provided between the inlet and outlet chambers of the device; although this mechanism is normally closed, In other words, until the pressure difference drops to a predetermined value and thus the viscosity drops, the cooled fluid reaches the operating temperature, i.e. the value at which the bypass flow is interrupted and the fluid flows through the heat exchange channel. Until now, it has a pressure adjustment mechanism that enables bypass flow of fluid.

  Patent Document 2 discloses a cooler for a fluid medium, more specifically, a water cooler for an oil-operated hydraulic assembly and an internal combustion engine. In the water cooler, cooling is performed so that heat exchange is performed. The cooling medium II is in indirect contact with the cooling medium I, and the apparatus comprises a conventional branch comprising a connection branch for flowing into and out of the cooling element. It has an oil-air cooler, the cooling element has several parallel cooling channels that are separated from each other by a predetermined distance, in the space between them the blades and the medium I flow turbulently And a cover provided on the longitudinal side having a connection branch, which is attached to the part of the connection branch, with an inner seal and an outer seal And a hollow casting element having a substantially cubic shape, the hollow casting element having several chambers and joints for inflow or outflow of the medium I, and an oil-air A cooler is introduced, which is mounted so that during operation the outer end of the cover is connected to the end of the housing by a sealing seal.

This configuration provides a fluidized medium cooler that is cost effective in production and provides improved heat exchange. However, overpressure and thus damage in known devices occurs, especially during start-up when each fluid is cold and highly viscous.
German Patent No. 19651988 German Patent No. 4106963

  The object of the present invention is characterized by a simple structure that can be designed in a simple and cost-effective manner while maintaining the advantages of the prior art described above, and the safety of the medium cooled in operation over the widest possible temperature range It is to further improve the known apparatus so as to increase the.

  This object is achieved by a device having the features defined in claim 1.

  The apparatus in the present invention has a heat exchange block. In the heat exchange block, a fluid flow path involved in heat exchange extends between an inlet chamber that partitions the block on one side and an outlet chamber that partitions the block on the opposite side, and includes a fluid passage and cooling air. The flow paths through which the other medium flows are alternately stacked in the block. A cover plate is provided as an upper element for closing the block. As specified in claim 1, the cover plate has at least one internal flow path that bypasses the fluid passage and extends as a bypass channel from the inlet chamber to the outlet chamber. Can be opened and closed by a pressure adjustment mechanism as a function of the pressure difference between the inlet chamber and the outlet chamber. Therefore, in the present invention, the bypass mechanism is provided as a safety mechanism in order to prevent accumulation of overpressure from being formed on the cover plate of the heat exchange block. This greatly simplifies the structure of the device and allows it to be manufactured as simply and inexpensively as desired.

  In the manufacture of heat exchange blocks, the structural members that form the fluid passages and flow paths can be soldered together sequentially to form a block with the desired number of elements, and at the same time form a second fluid mechanism The cover plate to be attached can be attached to the upper stage of the block by soldering.

  It has been found that the manufacture of the device is particularly simple if a cover plate section of a hollow cast element made by extrusion is provided in the form of a flat tube closed at both ends by a seal plate. The hollow cast element section may be extruded so that a single flat tube is formed, i.e. a single flow path is created in the cover plate. However, it is advantageous to extrude the flat tube so that it has two internal channels in the section of the hollow casting element that forms the flat tube. In any case, regardless of whether a single flow path or several flow paths are formed, a flow path hole is provided at the end of each flow path to allow fluid connection between the inlet chamber and the outlet chamber.

  At least one pressure adjusting mechanism is provided in each flow path of the flat tube. These pressure adjusting mechanisms may be attached to one of the flow path holes in the flat tube.

  In one preferred embodiment, a spring-loaded seat valve is attached to each flow path as a pressure adjustment mechanism.

  A particularly simple structure is achieved when the flat tube forming the cover plate at the end of the flow path or the plurality of flow paths is formed by a seal plate that is soldered during soldering of the heat exchange block . If the seal plates extend over the ends of several channels, the seal plates preferably form passages in them that allow fluid connection between the channels. This passage may be made in the form of an elongated groove extending over the end of the flow path present in the flat tube.

  The present invention will be described in detail below using embodiments illustrated in the accompanying drawings.

  FIG. 1 is a schematic diagram of an exemplary embodiment of an air / fluid cooler in the present invention, where the cooler is a unit of an inlet chamber 1 for the fluid to be cooled and an outlet chamber 3 for the fluid outlet. It is comprised by the structure. Between the inlet chamber 1 and the outlet chamber 3, it has a plate-shaped heat exchange element in which heat exchange blocks are alternately stacked, more specifically, a fluid guide element 5 and a lattice element 8, and the fluid guide element 5 The cooling element has an internal fluid passage 7 through which the liquid to be cooled flows from the inlet chamber 1 toward the outlet chamber 3, and the grid element 8 is a flow for cooling air that flows and sweeps over the cooling blades of the grid element 8 Forming a road. The fluid guide element 5 and the lattice element 8 are substantially square or rectangular plate-like structural members.

  A heat exchange block comprising a lateral inlet chamber 1, a lateral outlet chamber 3, and a stack of fluid guide elements 5 and lattice elements 8 placed between them, all of their structural members are united. It is soldered and closed at the top by a cover plate 9, which is also soldered. The cover plate 9 forms a bypass mechanism for fluid connection between the inlet chamber 1 and the outlet chamber 3, and the bypass mechanism bypasses the fluid passage 7 in the fluid guide element 5. 1 and 2, these arrows indicate the fluid inflow from the inlet chamber 1 to the cover plate 9 and the outlet chamber 3 from the cover plate 9 via the spring-loaded ball return valve 11. FIG.

  The return valve 11 is normally closed by a spring bias, and if the pressure difference between the inlet chamber 1 and the outlet chamber 3 exceeds a threshold value selected by setting the spring force of the valve, the fluid will flow. It is a pressure adjustment mechanism that enables flow. Only one return valve 11 is shown in FIG. However, in the exemplary embodiment, several return valves 11 may be used continuously for the purpose of ensuring the required valve channel cross-sectional area. Unlike FIG. 1, FIG. 2 illustrates the fluid flow formed by the bypass mechanism through the return valve, ie into the outlet chamber 3.

  As shown in FIG. 3, the cover plate 9 is formed by a section of extruded hollow casting element, which in this example is a two-flow tube, ie a flat tube shape having two internal flow channels 13. In addition, each of the two ends of the flat tube forming the cover plate 9 is closed by a seal plate 15, which is illustrated in detail in FIG. A through hole in the wall surface of the flat tube forming the cover plate 9 forms a fluid connection between the inlet chamber 1 and the internal flow path 13 and a fluid connection between the internal flow path 13 and the outlet chamber 3. . Although only one through-hole connected to the inlet chamber 1 is shown in FIG. In the case of maintaining the two flow paths 13 provided in the exemplary embodiment, two through holes 17 are provided in the inlet chamber 1 and two through holes 19 are provided in the outlet chamber 3.

  As described above, the return valve 11 is attached to each through-hole 19 as shown in FIG. 2 in order to ensure a sufficiently large valve channel cross section without using a remarkably large diameter valve. . In order to enable fluid connection between the two flow paths 13 at both ends of the flat tube forming the cover plate 9, the seal plate 15 is provided with an oval groove 21 having a recess. In the case of the seal plate 15 soldered to the cover plate 9 and the end of the flow path 13, the groove 21 extends over both ends of the two flow paths 13 as shown in comparison with FIGS. As a result, the flow path forms a flow path that fluidly connects between the flow paths 13 at the two ends of the flow path.

  When the device is completed, the access hole 23 is made in the wall surface of the flat tube forming the wall surface of the cover plate 9 in order to allow access to the return valve 11 that achieves the function of the pressure regulating mechanism. The hole 23 is formed to face each return valve 11 (see FIGS. 1 and 3). As shown in FIG. 1, the access hole 23 may be closed by a seal component 25, and the seal component 25 may have a shape that is screwed into the cover component.

  Although not shown, in one embodiment of the present invention, each pressure regulating mechanism 11 may be a pressure and / or temperature activated closure component, such as a temperature dependent elastic element. . If the medium to be cooled is a low temperature, a high pressure is correspondingly accumulated in the apparatus, and the pressure adjusting mechanism 11 has a bypass function without a cooler. If the temperature of the medium to be cooled rises, the medium fluid will flow directly to the cooler, bypassing the bypass function, and at high temperatures the closing component will close the bypass. Thus, the closing element is suitably made of an elastic element, for example.

  The bypass device in the present invention can be connected to existing cooling. This is because the bypass device can be selected at a height that matches the height of the fluid channel 7 and blade channel 8 structure. Thus, if each of the upper blades integrated with the fluid channel is removed from the cooling mechanism, a structural space for installing and welding a standard height bypass device is created, so that the replacement cooling device Matching with the bypass device is possible directly without significantly reducing the cooling efficiency.

FIG. 1 is a schematic diagram of an exemplary embodiment of an air / fluid cooler in the present invention. FIG. 2 is a schematic diagram for clarity of fluid flow in an exemplary embodiment, showing an embodiment of a bypass mechanism with an associated pressure adjustment mechanism. FIG. 3 is a cross-sectional view of the two-way flat tube of the flat tube bypass machine as viewed from the direction of arrows III-III in FIG. FIG. 4 is a plan view of the inside at the end of the sealing tube for closing the flat tube shown in FIG.

Claims (12)

A heat exchange device between fluid media in which at least one of the fluid media is in a fluid state, wherein one side is attached to the inlet chamber (1) for allowing the fluid exchange device to flow in and out of the fluid media The opposite side has a heat exchange block attached to the outlet chamber (3), the heat exchange block having a fluid passage (7) for the fluid medium and a cover plate (9) The fluid passage (7) extends through the heat exchange block from the inlet chamber (1) to the outlet chamber (3), and the fluid passage (7) is between them The cover plate (9) covers the fluid passage (7) and the flow path (8), and is separated from each other by a flow path through which other media can flow. From the inlet chamber (1) to the outlet chamber ( ) Are extended to, in the heat exchange device;
The cover plate (9) has at least one internal flow path (13) bypassing the fluid passage (7), the internal flow path (13) from the inlet chamber (1) to the The inlet chamber (1) and the outlet chamber (3) extend as a bypass channel to the outlet chamber (3) and can be blocked by at least one pressure regulating mechanism (11) and exceed a predetermined threshold. And can be released by opening the pressure adjustment mechanism (11) based on the pressure difference acting between the two;
Heat exchange device.   The heat exchange device according to claim 1, comprising a section of a hollow cast element that is formed in a flat tube (9) formed by extrusion processing and is closed at both ends by a seal plate (15).   Through holes (17, 19) are formed in the wall surface of the flat tube (9) at both ends adjacent to the inlet chamber (1) and the outlet chamber (3). Heat exchange according to claim 2, wherein 19) forms at least one flow path (13) of the flat tube (9) and a fluid connection between the inlet chamber (1) and the outlet chamber (3). apparatus.   The flat tube (9) has two internal flow paths (13), each of the two internal flow paths (13) being connected to the inlet chamber (1) and / or by the through holes (17, 19). 4. A heat exchange device according to claim 3, connected to the outlet chamber (3).   The heat exchange device according to claim 4, wherein at least one pressure regulating mechanism (11) is provided in each of the flow paths (13) of the flat tube (9).   The pressure regulating mechanism (11) is attached to a through hole (17, 19) extending through the wall surface of the flat tube (9) for each flow path (13). The heat exchange apparatus as described in any one of -5.   The heat exchange device according to claim 6, wherein the pressure adjusting mechanism (11) is provided in the through hole (19) connecting the flow path (13) to the outlet chamber (3).   The heat exchange device according to any one of claims 1 to 7, wherein a return valve (11) having a spring-biased seat valve shape is provided as a pressure adjusting mechanism.   An access hole (23) closed by a sealing component (23) and allowing access to the return valve (11) is on the opposite side of the return valve (11) in the wall of each flow path (13). The heat exchange device according to claim 8, wherein the heat exchange device is formed in the portion.   A passage (21) forming a fluid connection between the flow paths (13) is formed in the seal plate (15) closing the end of the flat tube (9). The heat exchange apparatus as described in any one of.   The passage of the seal plate (15) is formed in the shape of an elongated groove (21) made in the seal plate (15), the elongated groove (21) being the passage in the flat tube (9). The heat exchange device according to claim 10, which extends over both ends of (13).   The heat exchange device according to any one of claims 1 to 11, wherein each pressure regulating mechanism (11) is constituted by a sealing component that is actuated by pressure and / or temperature.

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