JPS6222400B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention has an evaporator block and a connection box having a fin tube structure, and at least the starting end and the terminal end of a plurality of evaporator tubes connected in parallel in the evaporator block are connected to the connection box. , the ends of these evaporator tubes open into a common collection space of the junction box, and the junction box is provided with a bench-liquid distributor in which the refrigerant is divided into a plurality of sub-streams,
The present invention relates to an evaporator of an air conditioner, in particular for a motor vehicle, which is led from the ventilator distributor to the evaporator tube through a number of connecting channels in a connecting box corresponding to the number of sub-streams.

An evaporator for air conditioners consisting of an evaporator block and a junction box containing a number of bifurcated tubes and air-guiding laminates is disclosed in German patent application no.
It is known from specification No. 2847525. The junction box incorporates a distribution space and a collection space. The refrigerant enters the distribution space via the refrigerant injection nozzle, flows through the U-shaped forked pipe, enters the collection space and is removed via the compressor suction line.

In such evaporators, all the evaporator tubes are composed of forked tubes, each forked tube leading into a distribution space and a collection space. All bifurcated tubes thus form parallel-connected evaporator tubes.
In such a configuration, uniform distribution of the refrigerant with the same phase proportions present in the two phases to all parallel-connected evaporator tubes is difficult if the number of parallel-connected evaporator tubes is very small. I can only do so much. As a result, for the power outputs common in automobiles, the evaporator must be constructed with a very narrow design and a large length of bifurcated tube. The configuration space required for this is usually not available. Due to the fact that a large number of evaporator tubes are fed by one common injection and distribution space, the output of the evaporator is eventually become inadequate.

The refrigerant flow distributor derived from the bench lily tube is
It is known from US Pat. No. 2,803,116. On the inlet side, this distributor consists of a bench lily tube and on the outlet side it consists of a number of outflow passages, the individual diameter of which is smaller than the narrowest cross-sectional area of the bench lily tube. The outflow channels are arranged symmetrically around the conical circumferential surface. The outflow passage forms a conical tip in the center of the bench lily tube. In the known evaporator, a distributor tube is brazed into the outlet channel of the bench lily distributor, which distributor tube is connected to the evaporator tube, and the number of outlet channels is made up of a plurality of two series-connected outlet channels. It also corresponds to the number of evaporator tubes consisting of tubes. In order to obtain the same flow resistance in all the inlet tubes, these inlet tubes have to be bent and oriented individually, which generates significant costs. The brazing of the bifurcated pipes and the functional tests required therefor are also cost-intensive work processes.

SUMMARY OF THE INVENTION It is therefore an object of the invention to provide an evaporator of the type mentioned at the outset which is simple in construction, economical to manufacture and which provides a uniformly distributed cooling power over the evaporator block.

In order to solve this problem, according to the present invention, a connecting passage is provided in a push-in body that is fitted into a hole in a junction box. In this way, the connecting passages are formed in advance on the pusher body, and by simply fitting the pusher body into the hole of the connection box, the passages for partial flow of the refrigerant divided in the ventilator distributor can be easily connected to the respective evaporator tubes. be able to. Moreover, this pusher body can be easily manufactured from a workpiece that is easy to process by injection molding and cutting. Since the junction box also has a hole with a simple cross section that matches the contour of the pusher, its manufacture is simple and its weight can be reduced.

According to another advantageous embodiment, the channels are formed by grooves in the circumferential surface of the pusher body, the ends of these grooves being arranged in a straight line parallel to the axis of the cylindrical pusher body. . In this way, the passages can be manufactured very simply and the manner in which they are arranged can be chosen at will. In the installed state of the pusher body, the grooves are covered by the housing of the junction box, so that the passages are separated from each other. A bench lily distributor is provided on the pusher body at the end face, the cone of the bench lily distributor being provided with outlet channels distributed over its circumferential surface for the installation of the components being formed in one piece with the pusher body. It is advantageous to have one. By incorporating the components,
Work steps are saved and the number of seams to be sealed is reduced.

By constructing the pusher body in two parts, a channel can be provided inside the pusher body, the channel being configured as a groove in one part of the pusher body and covered or covered by the other part. It is configured as the same groove in both parts of the pusher body. By providing the bench lily distributor in the center of the longitudinal extension of the pusher body, the length of the passage to the furthest connecting tube piece is reduced by half. If the bench lily distributor is provided in this way, the part of the pusher body in which the grooves are also provided has a distributing and diverting piece, the outlet passage is provided on the circumference of this pusher body, and the other part of the bench lily distributor is provided with a distributing and diverting piece. Advantageously, an inlet opening is provided. The distribution and deflection piece can be designed as a separate component that is inserted during the connection of the two parts of the pusher body.

According to a further development, in order to obtain the same pressure drop in all channels, it is advantageous for channels of the same cross-sectional area to have the same length, for example by turning the grooves.

If, for construction reasons, the passages have different lengths, but the same pressure drop is nevertheless to be obtained in all passages, it is advantageous for the longer passages to have a larger diameter than the shorter ones. It is. In order to avoid disturbing effects that occur in the collecting space depending on the arrangement of the compressor suction line, different velocity distributions in the collecting space are compensated for by matching the diameters of the passages.

For further simplification with respect to production and weight reduction, the junction box is constructed in two parts, one part being configured as a distribution box for housing the channel pushers and the other part being configured as a collection box. It is advantageous to have

Many factors must be considered when selecting materials. What has to be taken into account in this case is whether the material is impermeable to the refrigerant, ie, whether fluorinated hydrocarbons do not diffuse through the material when the refrigerant is present. Additionally, material processability, price and weight are important. For these reasons, the junction box is preferably made of fiber-reinforced polyamide or aluminum. To prevent refrigerant diffusion, connect the junction box,
Lined and/or lined with refrigerant-impermeable material
It can be covered outside.

Embodiments of the evaporator according to the invention will be described below with reference to the drawings.

FIG. 1 shows schematically an evaporator block 1 comprising a number of evaporator tubes consisting of tubes 2, 2', a forked tube 3 and a bent tube 4; Alternatively, it consists of a laminated plate 6 provided at right angles to the forked pipe 3. The tubes 2 each form the beginning and end of an evaporator tube 5 , which is attached to a junction box 7 . Junction box 7 essentially includes a distribution box 48, a collection box 49 and an intermediate part 46 therebetween. middle part 46
has two recesses 47 for attaching the forked pipe 3.
have. The distribution box 48 has holes 56 from which a number of connecting tubes 12 emanating from them corresponds to the number of evaporator tubes 5 . Into the hole 56 an object 50, which is designed as a pusher, is inserted, which has grooves 5 as connecting channels distributed evenly around the circumference on the circumference.
1, 52, 53, 54 and 55.
The groove 51 is present in the area of the connecting tube 12 and opens into it. Other grooves 52 to 5
5 is covered by the wall of the distribution box 48. The collecting box 49 has a collecting space 13 into which all the evaporator tubes 5 attached to the connecting pipe pieces 14 open.

FIG. 2 shows an arrangement similar to that of FIG. 1, and therefore like parts are numbered correspondingly in FIG. Unlike the evaporator of FIG. 1, the junction box in FIG. 2 is constructed in two parts, so that the distribution box 48 is connected to the collection box 49 only via the evaporator block.

FIG. 3 is a sectional view of the junction box 7 taken along the - line in FIG. 1. As is clear from this,
A hole 56 extends substantially the entire length of the distribution box 48. A pusher body 50 is present in the hole 56 and has grooves 51 to 55.
A ventilator distributor 9 is attached to the end face of the pusher body 50 in the area of the borehole inlet, to which a refrigerant inlet 8 is connected. The bench lily distributor 9 has a plurality of outlet passages 10, one outlet passage 10 for each evaporator tube 5. The outlet passage 10 is a groove 51
55 , each of which opens into a connecting tube 12 . In order to ensure that the outlet passage 10 is always the same as the grooves 51 to 55, a rectangular or oblong recess 26 is provided in the end face of the vent lily distributor 9 as a twist prevention device. The corresponding protrusion 27 on the end face of the push-in body 50 snaps into place, so that a snug connection is obtained. On the right side of FIG. 3, a collection box 49 with a collection space 13 and a connecting tube 14 is shown. A compressor suction line 15 is connected to the collective space 13 . The compressor suction pipe 15 is connected to the gathering space 1
3 can also be connected to the other end. In this way, differences in pressure drop across channels 51 to 55 of various lengths can be compensated to a large extent. XII−
Line XII shows the sectional view of FIG.

FIG. 4 is a perspective view of a pusher body 50 having grooves 51 to 55 on its circumferential surface. As can be seen from this figure, the starting ends of the grooves 51 to 55 are uniformly distributed around the cylindrical pusher body 50 and extend from there first in the direction of the longitudinal axis of the pusher body 50 and then in the circumferential direction. The ends of these grooves each lie on a straight line parallel to the same longitudinal axis of the pusher. Groove 5
1 extends in a straight line parallel to this axis, it goes without saying that this groove does not have a portion extending in the circumferential direction. Due to this construction, the grooves 51 to 55 have different lengths, with groove 51 having the smallest length and groove 55 having the largest length. The protrusion 27 is visible on the end surface of the pusher 50.

FIG. 5 shows a push-in body 50 with grooves 51 to 55, with a cone 60 integrally formed on the side where the grooves 51 to 55 begin. The cone 60 is part of a bench lily distributor and has outlet passages 10 on its circumference, these outlet passages forming grooves 51.
55.

FIG. 6 is a cross-sectional view of distribution box 48, which has an aperture 56 therein. The distribution box 48 has a tube piece 66 for connecting the refrigerant inlet. Hole 5
6 there is a push-in body 50 consisting of two parts 58 and 59, into which a distribution and deflection piece 60 is fitted. The tip of the distribution and deflection piece 60 projects into an inlet opening 67 of the bench lily distributor, which inlet opening is present in the section 59. The distribution and deflection piece 60 has on its circumference a plurality of outlet passages 10 of the bench lily distributor, which, as can be seen in FIG. 7, transition into distribution passages. The outlet channel 10 leading downwards opens into a groove 63 leading to the connecting tube piece 12, which groove is located in the part 58 closer to the part 59.
It is located on the side. The tube 2 is attached to the connecting tube piece 12 by a pressing plate 68.

Figure 7 shows the distribution box 4 along the - line in Figure 6.
8 is a sectional view of FIG. As can be seen from this figure, connecting tube pieces 12 are provided uniformly distributed over the entire length of the distribution box 48, these connecting tube pieces 12 receiving the evaporator tubes. A distribution and deflection piece 60 is provided in the center of the section 58, and outlet passages 10 are provided radially around the circumference of this distribution and deflection piece. Channel 10 opens into channels formed by grooves 61 , 62 , 63 , 64 and 65 , which in each case lead to connecting tube piece 12 . The lengths of grooves 61 to 65 are different, in which case groove 63
has the smallest length, and grooves 61 and 65 have the largest length. By centrally arranging the distribution and deflection piece 60 of the bench lily distributor, the grooves 61 to 65 can be constructed significantly shorter, with only half the length of the grooves compared to the configuration shown in FIG. do not have. In order to ensure that the ends of the grooves 61 to 65 are always the same as the openings of the connecting tube piece 12, a twist protection is provided, which is connected to the corresponding recesses of the distribution box 48 and the section 58. It consists of a key 57 that fits in place. A rubber ring 70 is provided for sealing against the atmosphere.

FIG. 8 is a perspective view of pusher body 50, which is comprised of sections 58 and 59. The course of the grooves 61 to 65 inside the pusher body 50 is shown in broken lines. As can be seen from this figure, the grooves 61 to 65 are located in the pusher body 5 having the portion 58.
0, is covered by the portion 59, and forms a passage for guiding the refrigerant.

FIG. 9 shows a junction box 7 with a pusher body 50 and a bench lily distributor 9. In FIG. Distribution box 4
8 has a downwardly directed connecting tube piece 12 onto which the evaporator tube 5 is fitted and secured by a press ring 68. An aperture 92 is present in the distribution box 48 as a hole, which aperture has a generally rectangular cross-section with rounded corners. A pusher body 50 is fitted into the opening 92 and consists of two pusher body parts 90 and 91, both of which share a cross-sectional shape that corresponds to the shape of the opening 92. There is. Push body portions 90 and 9
The dividing plane between 1 and 1 extends in the longitudinal direction of the pusher body 50, and an opening is provided in the portion 91 into which the protruding portion 90' of the portion 90 projects. The parts 90 and 91 are provided with grooves provided in the dividing plane, which grooves together form a channel 11 with a round cross section. In FIG. 9, the downward passage is shown as groove 95, and the upward passage is shown as groove 97. A ventilator distributor 9 is fitted into the opening of the distributor box 48 and has an outlet passage 10, to which a refrigerant inlet 8 is connected on the inlet side. The bench lily distributor 9 is mounted in the distribution box 48 by means of bent ears 36 and sealed by a sealing ring 35. The bench lily distributor has a flat recess 10 in the pusher body 50.
In the recess 100 there is a rectangular or elongated opening 26 into which a corresponding projection 27 on the end face of the bench lily distributor 9 fits.

FIG. 10 is a sectional view of the distribution box 48 taken along the - line in FIG. As can be seen from this figure, the connecting tube piece 12 into which the evaporator tube fits is connected to the distribution box 48.
are uniformly distributed over the entire length of the In the center of the part 90 there is a circular projection 90', around which grooves 93 to 97 begin and end in a distribution distributed over the respective connecting tube 12.
The lengths of the grooves 93 to 97 are different;
is the shortest, and grooves 93 and 97 have the greatest length. A rubber ring 70 is provided to seal the pusher body 50 against the atmosphere. 1st
In FIG. 0, the sectional view of FIG. 9 is indicated by a - line.

FIG. 11 is a sectional view of the pusher body 50 along the line - - in FIG. 10, which is composed of portions 90 and 91. The course of the grooves 93 to 97 in the pusher body 50 is shown in broken lines.

FIG. 12 shows a distribution box 48 having a hole 56 in which a cylindrical pusher 50 is provided. The pusher body 50 has a flat portion 106 on the side of the bench lily distributor 9, and the bench lily distributor 9 contacts this portion. Grooves 102 and 103 extend along the circumferential surface of the push-in body 50 and lead to the connecting tubes 12 which are arranged in a row. Grooves 102 and 103 are formed on the circumferential surface of pusher body 50 and covered by distribution box 48 .

FIG. 13 is a sectional view taken along the - line in FIG. 12. As can be seen from this figure, there are five grooves 101 to 105, and these grooves extend in the circumferential direction on the circumferential surface of the cylindrical pusher body 50.
It extends in a spiral. All grooves 101 to 105 end in one common plane, in which the connecting tube 12 opens into the bore 56 . Cutting line. This plane is shown by , and FIG. 12 is shown in this plane.

[Brief explanation of the drawing]

FIG. 1 shows a junction box configured as a distribution box and collection box with a schematic evaporator block; FIG. 2 shows an evaporator in which the distribution box is constructed separately from the collection box. , FIG. 3 is a sectional view taken along the - line in FIG. 1, FIG. 4 is a perspective view of a pusher body having a passage, FIG. 5 is a perspective view of a pusher body integrally formed with a bench lily distributor, and FIG. 7 is a sectional view taken along line - in FIG. 6; FIG. 8 is a perspective view of the pusher consisting of two parts; Fig. 9 is a cross-sectional view of a pusher body having a rectangular cross-sectional shape with a passage, Fig. 10 is a cross-sectional view taken along the - line in Fig. 9, and Fig.
FIG. 12 is a cross-sectional view of a cylindrical pusher having a spirally extending passage, and FIG. 13 is a cross-sectional view taken along the line - in FIG. 12. 1... Evaporator block, 5... Evaporator tube, 7...
... Connection box, 9 ... Bench lily distributor, 13 ... Gathering space, 50 ... Push body, 51 to 55, 61
~65,93~97,101~105...Aisle,
56, 92... hole.

Claims (1)

[Claims] 1. An evaporator block 1 having a fin tube structure and a connection box 7, in which at least the starting end and the terminal end of a plurality of evaporator tubes 5 connected in parallel in the evaporator block are connected to the connection box 7. The terminal ends of these evaporator tubes 5 open into a common gathering space 13 of the junction box 7,
The junction box 7 is provided with a bench lily distributor 9 in which the refrigerant is divided into a plurality of partial streams and passed through a number of connecting passages in the junction box 7 corresponding to the number of partial streams. In those leading from the bench lily distributor 9 to the evaporator tube 5, connection passages 51 to 55, 61 to 65, 93 to 97, 10
An evaporator for an air conditioner, characterized in that numbers 1 to 105 are provided on a pusher body 50 that is fitted into holes 56 and 92 of a connection box 7. 2. The bench lily distributor 9 has a plurality of outlet passages 10, these outlet passages are uniformly distributed on the conical circumferential surface of the bench lily distributor 9, and the number of these outlet passages is equal to the number of evaporator tubes 5. These outlet passages 10 correspond to passages 51-55, 61-65, 9
3-97, 101-105. The evaporator according to claim 1, characterized in that the evaporator is open to 3-97, 101-105. 3. The evaporator according to claim 1 or 2, characterized in that the bench lily distributor 9 is provided with twist prevention means 27 for the pusher body 50. 4 means 5 for defining the position of the pusher 50 in the junction box 7, with the pusher 50 having an elongated shape extending over the starting end of each evaporator tube 5;
The evaporator according to claim 1, characterized in that 7,100,106 are provided. 5. Evaporator according to claim 4, characterized in that the bench lily distributor 9 is provided at least approximately half the length of the pusher body 50. 6 The passage is formed by grooves 51 to 55 and 101 to 105 provided on the circumferential surface of the cylindrical pusher body 50, and the ends of all the grooves 51 to 55 and 101 to 105 are parallel to the axis of the pusher body 50. The evaporator according to claim 1, wherein the evaporator is provided on a straight line. 7 The bench lily distributor 9 is a cylindrical pusher body 50
The outlet passages 10 distributed on the conical circumferential surface of the cone 60 of the bench lily distributor 9 are provided in the pusher body 50.
Starting from the outlet passage 10 of the bench lily distributor 9, the grooves 51-55 first extend in the longitudinal direction of the cylindrical pusher body 50, and then the grooves 52-5
5. The evaporator according to claim 1, wherein some of the grooves of the cylindrical pusher body 50 extend in the circumferential direction. 8 Pushing body 50 has two parts 58, 59, 9
2. The evaporator according to claim 1, wherein the evaporator is made of 0.0. 9 Grooves 61 to 6 on the dividing surface of the pusher body 50
5, 93 to 97 are configured in one part 58 of the pusher body 50 and covered by the other part 59, or are configured over both parts 90, 91. The evaporator according to item 8. 10 A bench lily distributor is provided inside the pusher body 50, one part 58 of the pusher body 50 has a distribution and deflection piece 60, the outlet passage 10 is provided on the circumference of this distribution and deflection piece, and the other part 2. Evaporator according to claim 1, characterized in that the inlet opening of the bench lily distributor 9 is provided at 59 . 11. Claim 10, characterized in that the distribution and deflection piece 60 is constructed as a separate component that is inserted during the connection of the two parts 58, 59 of the pusher body 50. Evaporator as described. 12. The evaporator according to claim 6, wherein the grooves 101 to 105 are provided so as to extend circumferentially or spirally. 13 Bench lily distributor 9 to evaporator block 1
All the passages leading to the connecting pipe piece 12 are the passage 51.
2. Evaporator according to claim 1, characterized in that the evaporators 55, 61-65 are of the same length by turning and have the same cross-sectional area. 14 The junction box 7 is composed of two parts, one part is constructed as a distribution box 48 for storing the pusher body 50, and the other part is constructed as a collection box 49. An evaporator according to scope 1. 15. Claim 1, characterized in that each evaporator tube 5 is composed of a plurality of forked tubes 3, which are connected to each other by a bent tube 4.
Evaporator as described in Section. 16. Evaporator according to claim 1, characterized in that the junction box 7 is made of plastic, such as fiber-reinforced polyamide, or of metal, such as aluminum. 17. The evaporator according to claim 16, wherein the junction box 7 is lined or lined with a material that does not allow refrigerant to pass through.