FR2608683A1 - FUEL REFRIGERANT - Google Patents

Abstract

THE INVENTION RELATES TO A FUEL REFRIGERANT, WHICH CONSISTS OF AN INNER TUBE 1 AND OF A WRAP TUBE 2 CONCENTRIC THEREOF. THE REFRIGERANT CROSSES THE INNER TUBE 1 AXIALLY, WHILE THE FUEL FLOWS FROM AN INTAKE OPENING 4 TO AN EMISSION OPENING 6 IN THE ANNULAR SPACE 3 BETWEEN THE INNER TUBE 1 AND THE WRAPPING TUBE 2. TO AVOID IN IN PARTICULAR THE SPECIAL POSITIONING OF A TURBULENCE DEVICE, THE INTERIOR TUBE 1 IS SHAPED BY A FINNED TUBE WHOSE EXTERNAL FINS 1 DESCRIBE A PROPELLER. THE FUEL INLET 4 AND 6 ARE OPENED AT THE OPPOSITE ENDS OF THE REFRIGERANT. PREFERentially, the finned tube is also equipped with an internal corrugation or an internal fin. APPLICATION TO THE COOLING OF GASOLINE IN INJECTION ENGINES.

Description

The invention relates to a refrigerant of

  fuel, consisting of an inner tube and a casing tube arranged concentrically therewith, the inner tube being traversed axially by the coolant and the fuel flowing from an inlet port to an emission port in the annular space, closed at its ends,

  between the inner tube and the jacket tube.

  The fuel coolers of this type find their use mainly in injection engines, in which it is necessary to avoid, by cooling, the formation of troublesome air bubbles in the fuel. Excess heat is transferred in the fuel refrigerant to the gaseous refrigerant of the air conditioner.

  which makes the refrigerant warm up again.

  In a fuel cooler according to the prior art, for example according to German Patent No. 3,117,661, a "turbulence plate" must be interposed separately in the annular space between the inner tube and the jacket tube. This operation is expensive and time consuming. The invention therefore aims to simplify a fuel refrigerant according to the prior art so that, with at least equal turbulence effects, the separate introduction of a turbulence device

be deleted.

  This object is achieved, according to the invention, thanks to the fact that the inner tube is constituted by a finned tube whose outer fins describe a propeller, and that the intake ports and fuel emission

  are arranged at the opposite ends of the refrigerant.

  The problem that the invention aims to solve is thus solved in a simple manner; the finned tubes hitherto generally used for cross currents now find their use, advantageously, for parallel currents of fuel and coolant. Since the entire length of the finned tube is available for cooling, we obtain

  a higher cooling effect.

  The height h of the outer fins is

preferably from 0.3 to 2.0 mm.

  According to a particular embodiment of the invention, the inner tube has an inner wave or knurling helical. At the same time, this prevents the insertion into the inner tube of a

  turbulence device, which otherwise is necessary.

  The inner undulation follows the angle of inclination of the outer fins; in this case, an interruption in the direction of the helix is recommended to improve the effect of turbulence. It is best that the depth w of

  the inner corrugation is of the order of 0.03 to 0.45 mm.

  The lining will be in the form of at least one inner fin, which follows an angle of inclination

  different from the angle of inclination of the outer fins.

  In this case, the height of the inner fins is

preferably from 0.1 to 0.8 mm.

  The fuel intake and emission openings are preferably arranged around the periphery of the fuel.

envelope tube.

  Any positions of the couplings are advantageously allowed in that at least one connector is disposed at a distance from the inlet opening or

  of transmission, and is in communication with it.

  Inasmuch as it is necessary for the connections of the intake and emission openings to be brought together, it is recommended, according to a first variant of the invention, that the connection corresponding to the emission opening is connected to the opening of emission by a

  pipeline that runs along the tube envelope.

  According to a second variant, a second annular space, closed at its ends, is provided between the shell tube and a concentric outer tube, the emission opening being constituted by orifices distributed over the

around the envelope tube.

  In the measure o, according to the second variant, the concentric tubes are all three substantially of the same length, the connection corresponding to the inlet opening passes through the second annular space and is sealed by

report to this one.

  When the outer tube is shorter than the inner tube and the outer tube, the connection corresponding to the inlet opening is then arranged directly, from

  advantageously, on the jacket tube.

  To make handling easier, the connections are offset relative to each other in the circumferential direction. The invention will now be further described by means of the following exemplary embodiments and the accompanying drawings, in which: FIGS. 1 to 4 are longitudinal sections of an embodiment of a fuel coolant according to FIG. Figure 5 is a cross-section along the line AA of Figure 3, and Figure 6 provides explanations on the finned tube. The fuel refrigerant according to Figure 1 is

  consists of an inner tube 1 and a smooth casing tube 2.

  The inner tube 1 consists of a finned tube having outer fins 1 'which describe a helix, and also comprises an inner corrugation in the form of a helix. The outer fins 1 'and the inner undulation follow the same angle of inclination (this is not

  not shown more precisely).

  The annular space 3 which is formed between the tubes 1 and 2 is closed at both ends. The casing tube 2 comprises an inlet opening 4, to which a connection 5 corresponds, and an emission opening 6, to which corresponds a connection 7. The openings 4 and 6 are arranged

  in the terminal zone of the refrigerant.

  When the refrigerant is in use, the fuel to be cooled, which may be in particular gasoline, passes through the annular space 3, from the intake opening 4 to the emission opening 6. The refrigerant circulates in

  the inner tube 1, either in parallel or counter-current

  current. The inner tube which presents the inner corrugation ensures a simple mechanical handling - as well

  on the coolant side only on the fuel side -

  for a good formation of turbulence, and therefore a good

heat exchange.

  The embodiments of the fuel cooler according to Figures 2 to 5 correspond to the case where the connections 5 and 7 must be arranged one against the other. To allow the return of the fuel, the connection 7, according to FIG. 2, is connected to the emission opening 6 by a pipe 8 which runs along the casing tube 2. For the return of the fuel, according to FIGS. 3 and 4, an additional annular space 9, closed at its ends, is provided between the casing tube 2 and an outer tube 10. In this case, the emission opening 6 of the fuel, in the casing tube 2, is constituted by several orifices 6 2 according to Figure 3, the connector 5 which corresponds to the inlet opening 4 passes through the second annular space 9 and is sealed with respect thereto. To avoid such a crossing, the outer tube 10, according to Figure 4, is shorter than the inner tube 1 and the casing tube 2, so that the connection 5

  can be welded directly to the casing tube 2.

  In FIGS. 1 to 4, connecting pipes for the inner pipe 1 are represented by the numeral mark 11. According to FIGS. 1 to 3, these connecting pipes 11 are, for example, fitted onto the inner pipe 1, while according to the variant of Figure 4, they are embedded in the casing tube 2 and can be

  welded to the enlarged end of the inner tube 1.

  Figure 5 shows in particular the

  offset arrangement of the connections 5 and 7.

  Example: A fuel cooler according to Figures 4 and 5 was made from tubes having the following dimensions: (The tube tube nomenclature is explained in Figure 6) Table: Length (mm) Diameter Outside wall thickness ( mm) (mm) Inner tube 147 (tube at (same length) fins) Endless fins d1 = 16 s1 = 1 Finned part 132 d5 = 13 2 0.8 (core wall thickness) Enclosure tube 164 18 1 Tube outside 124 28.4 1.2 Finned tube: Height h external fins: 0.7 mm; Not m fins (distance between centers of the fins): 2.2 mm; Depth w of the inner corrugation: 0.3 - 0.4 mm; Diameter of the inlet opening: 8 mm;

  Diameter of the four emission openings: 6 mm.

  Using the gasoline refrigerant which has just been described, with refrigerant R 12, it has been obtained

good results.

Claims (14)

  1. Fuel cooler, consisting of an inner tube (1) and an envelope tube (2) disposed concentrically therewith, the inner tube (1) being traversed axially by the coolant and the circulating fuel of an inlet opening (4) at an emission opening (6) in the annular space (3), closed at its ends, between the inner tube (1) and the casing tube (2), characterized in the inner tube (1) is constituted by a finned tube whose outer fins (1 ') describe a helix, and in that the intake (4) and emission (6) openings of the fuel   are arranged at opposite ends of the refrigerant.   2. Fuel cooler according to claim 1, characterized in that the height of the outer fins (1 ') is 0.3 to 2.0 mm.   Fuel cooler according to Claim 1 or 2, characterized in that the inner tube (1) has a helical inner corrugation which follows the angle   of the outer fins (1 ').   4. Fuel cooler according to claim 3, characterized in that the inner corrugation is   interrupted in the direction of the propeller.   Fuel cooler according to claim 3 or 4, characterized in that the depth w of the corrugation interior is 0.03 to 0.45 mm.   6. Fuel cooler according to claim 1 or 2, characterized in that the inner tube (1) comprises at least one helical inner fin, which follows a different helix angle from that of the outer fins (1 '). ). 7. Fuel cooler according to claim 6, characterized in that the height of the fin (s)   interior is of the order of 0.1 to 0.8 mm.   8. Fuel refrigerant according to any one of   Claims 1 to 7, characterized in that the   intake (4) and emission (6) openings are arranged   around the perimeter of the casing tube (2).   9. Fuel refrigerant according to one   any of claims 1 to 8, characterized in that   at least one connection (5, 7) is arranged at a distance from the inlet opening (4) or the emission opening (6), and is connected to it.   10. Fuel cooler according to claim 9, characterized in that the connection (7) which is associated with the emission opening (6) is close to the connection (5) which is associated with the emission opening, the connection (7) being connected to the emission opening (6) via a pipe   (8) which runs along the casing tube (2) (Figure 2).   Fuel cooler according to claim 9, characterized in that a second annular space (9), closed at its ends, is provided between the shell tube (2) and a concentric outer tube (10), the opening of emission (6) being constituted by openings (6 ') distributed around the circumference of the casing tube (2), and in that the connection (7) for the second annular space (9) is close to the connection (5) which is associated with the opening intake (4) (Figures 3 and 4).   Fuel cooler according to Claim 11, characterized in that the connection (5) corresponding to the inlet opening (4) passes through the second annular space (9) and is leaktight with respect to this one (Figure 3).   Fuel cooler according to claim 11, characterized in that the outer tube (10) is shorter than the inner tube (1) and the outer tube (2), and in that the coupling (5) is associated with the intake opening (4) is arranged directly on the casing tube (2) (Figure 4).   14. Fuel refrigerant according to one   any of claims 9 to 13, characterized in that   the connectors (5, 7) are offset in the circumferential direction.