MX2014007701A

MX2014007701A - Cooling radiator having liquid cooling.

Info

Publication number: MX2014007701A
Application number: MX2014007701A
Authority: MX
Inventors: Otto Karl Gross
Original assignee: Schmehmann Rohrverformungstechnik Gmbh
Priority date: 2011-12-23
Filing date: 2012-12-21
Publication date: 2014-08-21
Also published as: MX343019B; RU2014130286A; CN104145316A; PL2795638T3; RS54767B1; WO2013091890A1; RU2625324C2; ES2569729T3; US20140318750A1; EP2795638B1; UA110292C2; HRP20160564T1; SI2795638T1; EP2795638A1; PT2795638T; HUE029246T2

Abstract

The invention relates to a cooling radiator (1), comprising an upper accumulator (2), a lower accumulator (3), and at least one sub-module (4) consisting of cooling elements that are respectively connected to the upper accumulator (2) and/or the lower accumulator (3) by means of individual manifolds (5), wherein the sub-modules (4) are provided with pipes (6) that have ribs (7) on the exterior sides thereof, characterized in that the sub-modules (4) are arranged vertically and transversely to the longitudinal direction of the accumulators (2, 3) and the pipes (6) of the sub-modules (4) are arranged parallel to and at a distance (22) from one another to allow air to pass therebetween.

Description

COOLING RADIATOR WITH COOLING BY LIQUID FIELD OF THE INVENTION The present invention relates to a cooling radiator, in particular a cooling radiator of a boiler of the active part, in which the cooling radiator is formed by cooling elements through which the force of gravity flows through a liquid refrigerant heated in the active part, from above through a collector or distributor tube, called collector, down to a distributor or lower collector, called lower collector, in which the cooled liquid returns to the transformer through the lower distributor and at least one cooling radiator is located away from or directly in the transformer or its boiler.

Cooling radiators of this type have, in addition to the upper and lower collectors, at least one partial cooling element module, which are connected to the upper or lower collector via individual distribution tubes, and the individual modules have tubes that on their outer side they are provided with ribs.

BACKGROUND OF THE INVENTION The cooling elements of transformers or other electrical appliances consist of either flat cooling elements through which oil regularly flows as a cooling liquid or a corrugated sheet, as is known from DE 10 2009 015 377 A. Cooling consisting of cooling elements in series or in parallel, are performed as a welded construction. To increase the life time, these are lacquered through complicated immersion or galvanized steps.

Therefore, the production of the cooling elements must be simplified and at the same time with a hermetic connection to gas or oil, with the collectors and in particular the heat transfer or transmission must be improved.

SUMMARY OF THE INVENTION Therefore, a task of the invention is to present a cooling radiator that on the one hand has a simple construction and on the other hand guarantees a high heat transfer with the same external dimensions of the cooling radiator as a whole. This task is solved in the sense of the invention with a cooling radiator having the characteristics of Claim 1. Advantageous embodiments of the invention are described in the appended claims.

According to the meaning of the invention, the partial modules are arranged vertically and transverse to the longitudinal direction of the collector, the tubes of the partial modules being arranged parallel to each other for a distance of air. This produces a cooling radiator consisting of several sequential tubes in series or parallel and introduced with a separation between them, in cavities of the upper collector pipe or the lower collector, which allow a particularly good air flow through the cooling radiator as a whole and in the cooling elements.

Thus, all the cooling elements of the cooling radiator preferably contribute in the same way to the transmission of heat from the cooling medium flowing through the cooling radiator, preferably oil, to the ambient air. The result is an especially high energy removal of hasla 38.00 kW / h, preferably up to 39.80 kW / h in a cooling radiator with a width of up to 540 mm, preferably up to 520 mm, and a height of up to 2 m, preferably up to 1.80 m. Preferably the cooling radiator has a height of 0.5 m to 3.60 m. In the case of optimized cross sections of both the upper and lower manifolds as well as the tubes of the partial modules in question, an oil flow through the cooling radiator of up to 2700 kg / h, preferably up to 2800 kg / h can be obtained.

As the tests have shown, the liquid, especially oil, which flows through the top-down tubes with the best cooling effect, experiences the least resistance, when an optimal cross section of the cooling radiator elements is maintained . Since only the smallest possible resistance is present, the system can work in free convection; no pumps are required.

The cooling radiator is thus presented as a complete compact unit, consisting of the desired number of partial modules arranged spaced apart from each other, and which are connected to the manifold by means of individual distributor pipes. The ambient air can flow around the complete cooling radiator or its partial modules both in the transverse direction as well as in the longitudinal direction, possibly with the support of ventilators or fans. The cooling or the transmission / transfer of heat is thus kept very efficient.

A preferred proposal provides that the tubes also the collectors, preferably the upper and lower collectors, as well as the individual distributor tubes, consist of a raw material or material that can be processed by extrusion, such as aluminum or aluminum alloys, magnesium. or light metals suitable for extrusion. These materials have on the one hand good heat transfer properties and on the other hand by the oxide layers that are formed are resistant to corrosion, in such a way that a lacquering or similar surface treatment or coating can be omitted, and therefore they can easily produced, this is preferably can be extruded with the desired geometry.

The cavities required to connect the individual components of the cooling radiator are preferably produced precisely by milling or laser, so that exact joining points can be obtained for the micrometric connection preferably by laser welding with a gas or oil tight connection .

It is preferred when each partial module consists of up to 12, preferably up to 10 tubes. With this it obtains a cooling radiator, whose effective surface can be adapted with particularly simple means to the required properties of the cooling radiator and which eventually the ambient air can flow completely around it.

In this respect, it is also preferred when the tubes of the partial modules in question have a preferably rectangular planar cross section, in particular a cross section with rounded corners. It is especially preferred that these tubes at least have an internal reinforcement, preferably two internal reinforcements. The width of the tubes is preferably up to 130 mm, preferably up to 120 mm. In particular, it is preferred that the distance of the tubes from each partial module is up to 30 mm, preferably up to 27 mm. Thus, a cooling radiator is obtained which on the one hand allows a sufficient flow of cooling medium as oil through the tubes of each module and on the other hand presents tubes with a sufficiently stable form. Finally, by selecting the distance between the tubes an optimum air flow can be obtained through the cooling radiator as a whole, with which the cooling power can be optimized.

It is further preferred that the ribs provided on the outer side of the tubes are longitudinal ribs, which preferably extend the entire length of the tubes, so that they essentially extend over the length of the tubes.

The entire length of the tubes, so that they extend to the entire length of the cooling radiator. It is especially preferred when up to 15, preferably up to 12, longitudinal ribs are provided per tube. In this regard it is especially preferred that the longitudinal ribs present a height, and with this an extension from the outer side of the tube outwards, of up to 15 mm, preferably up to 12 mm. The distance of the longitudinal ribs from each other must reach up to 25 mm, preferably up to 20 mm, in order not only to guarantee an effective surface for the cooling radiator with a high heat radiation, but also simultaneously optimizing the heat transfer of the medium Coolant to the ambient air that flows around and through the cooling radiator.

In another embodiment of the invention it is preferred that up to 10, preferably up to 8, partial modules are provided in the cooling radiator. These partial modules, which are linked each time by a. Single upper and one lower distributor tubes offer an especially large effective surface simultaneously with a compact construction of the cooling radiator. ? it is also preferred in this respect that at least the lower manifold, preferably the lower manifold, present a preferred rectangular cross section with dimensions of 20x80 mm cross-sectional area. Furthermore, it is preferred that at least the upper manifold, preferably both the upper manifold and the lower manifold, are positioned at one end of the individual distributor pipes and thus do not interrupt the air flow, especially from bottom to top, through the radiator. cooling along the partial modules. Only by placing the upper manifold away from the middle part of the individual distributor tubes towards its end, a 38% improvement in the air inlet to the cooling radiator could clearly be obtained.

A preferred embodiment provides for a prefabricated construction of the cooling radiator, in which the upper and lower col ectors are arranged in a longitudinal extension and have a random number of secuctional perforations on their length, in the case of oval tubes as the cooling element they are They provide longitudinal holes adapted to the shape of the longitudinal extension and transverse to it. The cooling elements are introduced to a partial module in the perforations of the individual distributor pipes connected to the lower and upper collectors, these have, and advantageously also the collector, a rectangular or rectangular format. square. The partial modules consisting of the upper and lower individual distributors with the cooling elements introduced, with their individual distribution tubes are connected transversely to the collectors and with flow connection are hermetically coupled to the oil to the collectors by means of one of the perforations of the collector, preferably by laser welding, and this is such that the collectors extend above the partial modules arranged transverse, either halfway or preferably laterally and displaced towards the ends of the individual distributor tubes.

BRIEF DESCRIPTION OF THE FIGURES The invention will be described below with reference to eight figures, in which preferred embodiments of the invention are shown. In the figures Figure 1 shows a front view of a cooling radiator according to the invention; Figure 2 shows a front view of the cooling radiator of Figure 1; Figure 3 shows a view from above on the cooling radiator of figures 1 and 2; Figure 4 shows an individual distributor tube for a cooling radiator according to the invention; Figure 5 shows a section of a collector of a cooling radiator according to the invention; Figure 6 shows a cross section through a tube of a partial module in a first embodiment; Figure 7 shows a cross section through a tube of a partial module in a second embodiment; Figure 8 shows a perspective representation of a cooling radiator according to the invention in a top-down view.

DETAILED DESCRIPTION OF THE INVENTION Figure 1 shows a front view of a complete prefabricated cooling radiator 1 ready for assembly and disassembly in a transformer. The cooling radiator 1 has an upper collecting tube 2 and a lower collecting tube 3, which can be connected to the transformer (not shown) by means of flanges 2a, 3a, in order to form a closed oil circuit with the transformer. Between the upper manifold 2 and the lower manifold 3 are connected to a plurality of partial modules 4, which extend perpendicular and transverse to the longitudinal direction of the collector tubes 2,3 in the drawing plane. The partial modules 4 in turn are associated with individual distributor pipes 5, which are coupled in a liquid-tight manner with the collector pipes 2,3 and the pipes of the partial module 4, in order to guarantee the passage of the cooling medium, as oil , through the entire cooling radiator 1. Finally sensors 20, 21 are connected to the upper collector 2 or to the lower collector 3, to measure both the flow rate and the inlet and outlet temperature of the cooling medium through the cooling radiator. 1 Figure 2 shows the cooling radiator 1 of figure 1 in a side view from the left and thus allows observing the front or first partial module. A plurality of these partial modules 4 arranged sequentially with spacings from each other, are coupled to the upper collector 2 and to the lower collector 3, form the cooling radiator 1 of FIG. 1. From the joint view of FIGS. 1 and 2 it can be concluded that the ambient air can flow around the cooling radiator 1 and its partial modules 4 or the elements that in the embodiment example are formed as oval tubes 5 (see figure 6). The hot coolant (oil) that flows from the consumer in the direction of the arrow The upper part of FIG. 1 is thus cooled in its downward path in an especially effective manner. From there the coolant moves in the direction of the lower arrow back to the consumer (boiler, active part of the transformer). The cooling radiator 1 can be connected to the consumer or possibly to the manifold 2,3 by means of the intermediate connection of tubular conduits through flanges 2a, 3a.

Figure 3 shows the cooling radiator 1 of figures 1 and 2 in a top view. The partial modules 4 with the cooling elements introduced into the individual distributor tubes 5 are arranged transverse and perpendicular to the upper collector 2 and are bridged by the collector 2 to the half of the partial module 4. The partial modules 4 consist here of five tubes 6. connected through the joint distributor tube 5 with an essentially rectangular cross-section. Between the tubes 6 a separation 22 is again provided for the passage of cold air through the partial modules 4 in question.

Figure 4 shows as particularity an individual distributor tube 5 seen from the side having perforations 23. Through the perforations 23 a hermetic coupling is made to the liquids and gases of the individual distributor tube 5 with tubes (not shown) for the passage of the cooling medium.

Figure 5 shows as a particular feature a manifold 2 seen from the side having perforations 24. Through the perforations 24, the gas and liquid-tight connection of the upper manifold 2 with the individual distributor pipes 5 (not shown) is realized. ).

Figure 6 shows a cross section through a tube 6 with an essentially rectangular cross section and rounded corners. On the outer side of the tube 6, at least on the longitudinal sides of the tube 6, longitudinal ribs 7 arranged equidistant from one another are arranged, by means of which ribs the effective surface of the tube 6 is clearly raised, that is the contact surface of the tube 6 with the ambient air flowing through the tube 6. To stabilize the tube 6 an internal reinforcement 88 is provided inside the tube 6.

Figure 7 shows a second embodiment of a tube 6 according to the invention as part of a partial module of a cooling radiator according to the invention. The tube 6 again presents an essentially rectangular cross section with rounded corners, in which on each longitudinal side of the tube 6 cooling ribs 7 are arranged with the same spacing from one another. Also the height of the ribs 7, and with this their extension from the outer side of the tube 6 outwards, is equal throughout the periphery of the tube 6, to obtain uniform heat transfer conditions through the tube 6. To stabilize the tube 6 as well as to dividing its cross section into three chambers of essentially the same size, internal reinforcements 8a, 8b are provided, which extend the entire length of the tube 6.

Figure 8 finally shows a perspective joint view of a cooling radiator 1 according to the invention in a top-down view. The cooling radiator 1 has an upper collector pipe? as well as a lower collecting tube 3, to which eight individual distribution tubes 5 are connected. These individual distribution tubes 5 are in turn connected to seven tubes 6, along whose length longitudinal ribs 7 extend. of the cold air through the cooling radiator 1 in an essentially uninterrupted manner, both the upper collector? as also the lower manifold 3 are positioned offset from the middle arrangement in the individual distributor tubes 5 (see FIG. 3) towards the end regions of the individual distributor tubes 5.

List of reference numbers 1 Cooling radiator 2 Upper collector 2nd Flange 3 Lower manifold 3rd Flange 4 Partial module 5 Individual distributor tube 6 Tube 7 Longitudinal ribs 8 Internal reinforcement 20 Sensor 21 Sensor 22 Distance between tubes 23 Drilling in the individual distributor tube 24 Drilling in the collector

Claims

NOVELTY OF THE INVENTION Having described the present invention as above, it is considered as a novelty and therefore the content of the following is claimed as property: CLAIMS

1. A cooling radiator (1), consisting of an upper manifold (2) and a lower manifold (3) as well as at least one partial module (4) made by cooling elements, which are coupled to the upper manifold (2) or lower (3) through individual distribution tubes (5), the partial modules (4) having tubes (6) that are provided with ribs (7) on their outer side, characterized in that the partial modules (4) are arranged perpendicularly and transverse to the longitudinal direction of the manifold (2,3) and because the tubes (6) of the partial modules (4) for the air passage are arranged parallel to each other with a gap (22).

2. The cooling radiator (1) in accordance with the rei indication 1, characterized in that at least the tubes (6) of the partial modules (4) consist of aluminum or an aluminum alloy.

3. The cooling radiator (1) in accordance with one of the preceding claims, characterized in that each partial module (4) has up to 12, preferably up to 10 tubes (6).

4. The cooling radiator (1) according to one of the preceding claims, characterized in that the tubes (6) of the partial modules (4) have a flat, preferably rectangular cross section, especially with rounded corners.

5. The cooling radiator (1) according to one of the preceding claims, characterized in that the tubes (6) at least have an internal reinforcement (8), preferably two internal reinforcements (8).

6. The cooling radiator (1) according to one of the preceding claims, characterized in that the width of the tubes (6) is up to 130 mm, preferably 120 mm.

7. The cooling radiator (1) according to one of the preceding claims, characterized in that the distance of the tubes (6) of each partial module (4) is up to 30 mm, preferably up to 27 mm.

8. The cooling radiator (1) according to one of the preceding claims, characterized in that the tubes (6) have longitudinal ribs (7), preferably up to 15, in particular up to 12 slots longitudinal (7).

9. The cooling radiator (1) according to claim 8, characterized in that the longitudinal ribs (7) have a height of up to 15 mm, preferably up to 12 mm.

10. The cooling radiator (1) according to one of claims 8 or 9, characterized in that the separation of the longitudinal ribs (7) from one another amounts to up to 25 mm, preferably up to 20 mm.

11. The cooling radiator (1) according to one of the preceding claims, characterized in that up to 10, preferably up to 8 partial modules (4) are provided in the cooling radiator (1).

12. The cooling radiator (1) according to one of the preceding claims, characterized in that the width of the cooling radiator (1) is up to 540 mm, preferably up to 520 mm.

13. The cooling radiator (1) according to one of the preceding claims, characterized in that the height of the cooling radiator (1) is from 0.5 m to 3.60 m, preferably up to 2.00 m.

14. The cooling radiator (1) according to one of the preceding claims, characterized in that the oil flow rate through the radiator of cooling (1) is up to 2700 kg / h, preferably up to 2800 kg / h.

15. The cooling radiator (1) according to one of the preceding claims, characterized in that the removal of energy through the energy radiator (1) is up to 38.00 KW / h, preferably up to 39.80 kW / h.

16. The cooling radiator (1) according to one of the preceding claims, characterized by at least the upper manifold (2) having a rectangular cross section, preferably with dimensions of 20x80 mm.

17. The cooling radiator (1) according to one of the preceding claims, characterized by at least the upper manifold (2), preferably both the upper and lower manifolds (3), are disposed at the end of the individual manifold tubes ( 5) .