JPH0622017U - Evaporator - Google Patents

Abstract

(57) [Abstract] [Purpose] To improve the cooling performance by making the refrigerant flow uniform. [Structure] The refrigerant flows from the inlet chamber 3 into the second and third header pipes 14 and 15, and then flows into the heat transfer tubes 18 and 18 forming the first and second core portions 20 and 21. By the second and third partition walls 16 and 17, the second and third header pipes 14,
Divide the middle of 15. The third partition wall 17 in the middle of the third header pipe 15 that is opened near the first partition wall 13 is provided closer to the inlet chamber 3 than the second partition wall 16 in the middle of the second header pipe 14.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The evaporator according to the present invention is incorporated into an air conditioner for an automobile and used to cool the air for air conditioning blown out into the interior of the automobile.

[0002]

[Prior art]

 An air conditioner for automobiles incorporates an evaporator to cool the air blown into the interior of the automobile. As such an evaporator, for example, Japanese Patent Application Laid-Open No. 2-17387 describes a structure as shown in FIGS.

The inside of the circular header pipe 1 is partitioned into an inlet chamber 3 and an outlet chamber 4 by a partition wall 2 provided in the header pipe 1. One end (left end in FIGS. 3 to 4) of three header pipes 5 and 5 arranged in parallel with each other is connected to the inlet chamber 3 therein. The other end (the same right end) of each header pipe 5, 5 is closed. Further, one end (the upper end in FIG. 3) of the flat heat transfer tubes 7 and 7 forming a core portion together with the plurality of fins 6 and 6 is connected to each of the header pipes 5 and 5, and each heat transfer tube 7 and 7 is connected. The other end (the same lower end) is connected to another header pipe 8 arranged in parallel with the header pipes 5 and 5.

Similar to the header pipes 5 and 5, one end (left end in FIGS. 3 to 4) of three provided header pipes 8 is closed, and the other end (right end thereof) is one half of the header pipe 9 (see FIG. (Lower half of 4). Both ends of the header pipe 9 are closed. Further, one end of another header pipe 10, 10 (see FIG. 5 described later) is connected to the other half portion (upper half portion of FIG. 4) of the header pipe 9. The other ends of the other header pipes 10, 10 are closed.

To the other header pipes 10 and 10, one end of a plurality of heat transfer pipes that also constitute a core portion together with a plurality of fins is connected, and the other end of each heat transfer pipe is connected to the above header pipes 5 and 5. It is connected to the header pipes 11 arranged so as to overlap each other. One end (the right end in FIG. 4) of each header pipe 11, 11 is closed, and the other end is connected to the outlet chamber 4.

FIG. 5 schematically shows the conventional evaporator described above. The operation of the evaporator will be described with reference to FIG. The structure of the evaporator shown in FIG. 5 is the same as that shown in FIGS. 3 to 4 except that the number of the header pipes 5, 8, 10 and 11 is changed to two for simplification. It is the same.

The refrigerant sent into the inlet chamber 3 as shown by arrow a is then sent into the header pipes 5a, 5b as shown by arrow b. The refrigerant sent into each of the header pipes 5a and 5b then flows toward the header pipes 8a and 8b through the core portion as indicated by arrow C, and then the header pipes 8a and 8b as indicated by arrow D. Flowing toward the header pipe 9. The refrigerant flows through the header pipe 9 as indicated by the arrow E and is then fed into the header pipes 10a and 10b as indicated by the arrow. The refrigerant sent into the header pipes 10a, 10b then flows through the core parts toward the header pipes 11a, 11b as shown by arrows G, and then as shown by arrows C in the header pipes 11a, 11b. The flow reaches the outlet chamber 4. Then, as shown by the arrow L, it is sent out from the outlet chamber 4. While the refrigerant flows through the core portions as indicated by arrows c and g, the refrigerant exchanges heat with the air flowing through the core portions to evaporate and cool the air.

[0008]

[Problems to be solved by the device]

 The evaporator of the present invention is intended to improve performance by preventing uneven flow of the refrigerant.

Refrigerant that is vigorously sent to the inlet chamber 3 as shown by the arrow A flows into the header pipes 5 a and 5 b after colliding with the partition wall 2 and then into the header pipes 5 a and 5 b. The amount of the refrigerant is not uniform, and the amount of inflow to the header pipe 5b opened on the side closer to the partition wall 2 is larger than the amount of inflow to the header pipe 5a opened on the side far from the partition wall 2. Along with this, it is unavoidable that the flow velocity of the refrigerant in the header pipe 5a becomes slower than the flow velocity of the refrigerant in the header pipe 5b.

The refrigerant flowing through the header pipes 5a and 5b sequentially flows into the heat transfer tubes 7 and 7 (see FIG. 3) that form the core portion. It is not uniform over the entire length of the pipes 5a and 5b, and is deviated due to the flow velocity of the refrigerant. For example, as shown in FIG. 6, the amount of inflow from the header pipe 5a having a low flow velocity into the heat transfer tubes 7, 7 increases as the distance from the inlet chamber 3 increases and decreases as the distance from the inlet chamber 3 increases. On the contrary, as shown in FIG. 7, the amount of inflow from the header pipe 5b having a high flow velocity into the heat transfer tubes 7, 7 is smaller as it is closer to the inlet chamber 3 and is larger as it is farther from the inlet chamber 3.

In the heat transfer tubes 7 and 7 in which the amount of inflow of the refrigerant is small, the refrigerant evaporates off completely in the middle, so that the temperature of the downstream side portion of the heat transfer tubes 7 and 7 does not sufficiently decrease and the air is removed. The ability to cool down decreases. Therefore, of the core portion provided between the header pipe 5a and the header pipe 8a, the portion shown by slanting grid in FIG. 6 and the core portion provided between the header pipe 5b and the header pipe 8b. Among them, the cooling performance of the portion shown by the slanted grid in FIG. 7 is insufficient, and the performance of the evaporator is reduced accordingly.

The evaporator of the present invention was devised in view of the above circumstances.

[0013]

[Means for Solving the Problems]

 The evaporator of the present invention has an inlet chamber and an outlet chamber that are formed by partitioning the middle part of the first header pipe, which is open at both ends, by the first partition wall, and a part of the inlet chamber has an opening in the inlet chamber. A second header pipe whose one end is connected to the near side, a third header pipe whose one end is connected to the side near the first partition in a part of the inlet chamber, and the above-mentioned second header pipe. The second partition wall that partitions the middle of the second header pipe, and the third partition wall that partitions the middle of the third header pipe at a portion closer to the inlet chamber than the second partition wall, and one end of each of the second partition wall and the second header pipe. A plurality of heat transfer tubes connected to each other and a plurality of fins sandwiched between adjacent heat transfer tubes, and a plurality of heat transfer tubes each having one end connected to the third header pipe And a plurality of flaps sandwiched between adjacent heat transfer tubes. And a second core portion which is provided in a state of being superposed on the first core portion in the air flow direction, and the other ends of the plurality of heat transfer tubes forming the first core portion are connected to each other. A fourth header pipe whose both ends are closed, and a fifth header pipe whose both ends are closed, to which the other ends of the plurality of heat transfer tubes forming the second core portion are connected. The other end of the third header pipe is connected to the other half of the third header pipe, and the sixth header pipe is closed at both ends, and one end is connected to the sixth header pipe. To the 7th and 8th header pipes connected to the outlet chamber, and the part in the middle of the 7th header pipe that is closer to the 6th header pipe than the center of the 7th header pipe. In the middle of the fourth bulkhead and the eighth header pipe, in the middle of the seventh header pipe The fifth partition wall for partitioning the portion closer to the side of the sixth header pipe is also sandwiched between the heat transfer tubes adjacent to the plurality of heat transfer tubes connected to the seventh header pipe at their one ends. A plurality of fins, and a third core portion provided in a state of being superposed on the first and second core portions in the air flow direction, and one end of each is connected to the eighth header pipe. A plurality of heat transfer tubes and a plurality of fins sandwiched between adjacent heat transfer tubes, and the fourth core is provided in a state of being overlapped with the first to third core portions in the air flow direction. And the other end of the plurality of heat transfer tubes forming the third core part are connected to each other and the both ends are closed, and the ninth header pipe and the plurality of transfer parts forming the fourth core part are connected. It has a tenth header pipe with the other end of the heat pipe connected and the both ends closed. It

[0014]

[Action]

 In the case of the evaporator of the present invention configured as described above, the flow of the refrigerant is prevented from being unbalanced, and the heat exchange between the air and the refrigerant is substantially over the front surfaces of the first to fourth core portions. Can be performed efficiently. Therefore, the performance of cooling the air is improved.

[0015]

【Example】

 1 and 2 show an embodiment of the evaporator of the present invention. An inlet chamber 3 and an outlet chamber 4 are configured by partitioning the middle of the first header pipe 12 having both ends open with a first partition wall 13. One end of the second header pipe 14 is connected to a part of the inlet chamber 3 near the opening of the inlet chamber 3, and a part of the inlet chamber 3 near the first partition wall 13. Is connected to one end of the third header pipe 15.

The middle of the second header pipe 14 is partitioned by a second partition wall 16, and the middle of the third header pipe 15 is partitioned by a third partition wall 17. However, the installation position of the third partition wall 17 is set closer to the inlet chamber 3 than the installation position of the second partition wall 16 is. The second partition 16 is installed at the center in the lengthwise direction of the second header pipe 14 or at a position slightly closer to the inlet chamber 3 than the center.

The second header pipe 14 is connected to one end of a plurality of heat transfer tubes 18, 18. The heat transfer tubes 18 and 18 and the plurality of fins 19 and 19 sandwiched between the adjacent heat transfer tubes 18 and 18 form a first core portion 20. Further, the third header pipe 15 is also connected to one ends of a plurality of heat transfer tubes that form the second core portion 21 together with the plurality of fins. The second core portion 21 is provided so as to overlap the first core portion 20 in the air flow direction.

The other ends of the plurality of heat transfer tubes 18, 18 constituting the first core portion 20 are connected to a fourth header pipe 22. Both ends of the fourth header pipe 22 are closed. The other ends of the plurality of heat transfer tubes forming the second core portion 21 are connected to the fifth header pipe 23. Both ends of the fifth header pipe 23 are closed.

On the other hand, the other ends of the second and third header pipes 14 and 15 are connected to one half of the sixth header pipe 24. Both ends of the sixth header pipe 24 are closed. One ends of the seventh and eighth header pipes 25 and 26 are connected to the sixth header pipe 24, respectively.

A portion of the seventh header pipe 25 closer to the sixth header pipe 24 side than the center of the seventh header pipe 25 is provided with a fourth partition wall 27, so that an eighth header portion A portion of the pipe 26, which is closer to the sixth header pipe 24 than the center of the eighth header pipe 26, is partitioned by a fifth partition wall 28.

One end of a plurality of heat transfer tubes is connected to the seventh header pipe 25. Then, the plurality of heat transfer tubes and the plurality of fins sandwiched between the adjacent heat transfer tubes form a third core portion 29. The third core portion 29 is provided in a state of being overlapped with the first and second core portions 20 and 21 in the air flow direction. Further, one end of a plurality of heat transfer tubes is connected to the eighth header pipe 26. The heat transfer tube and the plurality of fins sandwiched between the adjacent heat transfer tubes constitute the fourth core portion 30. The fourth core portion 30 is provided in a state of being overlapped with the first to third core portions 20, 21, 29 in the air flow direction.

The other ends of the plurality of heat transfer tubes forming the third core portion 29 are connected to the ninth header pipe 31. Both ends of this ninth header pipe 31 are closed. Further, the other ends of the plurality of heat transfer tubes forming the fourth core portion 30 are connected to the tenth header pipe 32. Both ends of the tenth header pipe 32 are closed.

The evaporator of the present invention configured as described above acts as follows to cool the air flowing through the first to fourth core portions 20, 21, 29, 30.

The refrigerant sent into the inlet chamber 3 as shown by the arrow a in FIG. 2 is sent from the inlet chamber 3 into the second and third header pipes 14 and 15 as shown by the arrows b and c. Be done. The refrigerant is sent from the inlet chamber 3 to the third header pipes 14 and 15 by the third header pipe 15 near the first partition wall 13 as in the case of the conventional structure described above. It tends to be performed smoothly as compared with the second header pipe 14 which is farther from.

On the other hand, in the case of the evaporator of the present invention, the distance from the inlet chamber 3 to the second partition wall 16 provided in the middle of the second header pipe 14 is the distance from the inlet chamber 3 to the third header pipe 15 It is longer than the distance to the third partition 17 provided on the way. Therefore, the heat transfer tubes 18, 18 connected between the inlet chamber 3 and the second partition wall 16 are part of the plurality of heat transfer tubes 18, 18 (FIG. 1) forming the first core portion 20. Is larger than the number of heat transfer tubes connected between the inlet chamber 3 and the third partition wall 17, which is a part of the plurality of heat transfer tubes forming the second core portion 21. The refrigerant is sent from the header pipe 14 to the first core portion 20 more smoothly than the refrigerant is sent from the third header pipe 15 to the second core 21.

As a result, the cooling medium is fed from the inlet chamber 3 toward the second and third header pipes 14 and 15 almost evenly, and the refrigerant in the header pipes 14 and 15 is also fed. It is possible to regulate the flow velocity of to an appropriate value. By regulating the flow velocity of the refrigerant to an appropriate value, the amount of refrigerant flowing from each header pipe 14, 15 to the plurality of heat transfer tubes 18, 18 constituting the first and second core portions 20, 21 is made uniform. I can. Therefore, it is possible to prevent the amount of refrigerant flowing into some of the heat transfer tubes 18 and 18 from becoming insufficient, and to prevent the air cooling by the core portions 20 and 21 formed by the heat transfer tubes 18 and 18 from being stopped. The performance of the data can be improved.

The refrigerant sent from the second and third header pipes 14 and 15 into the heat transfer pipes 18 and 18 forming the first and second core portions 20 and 21 is then transferred to the heat transfer pipes 18 and 18, respectively. It flows inside as shown by arrows d and e, and reaches the fourth and fifth header pipes 22 and 23. Then, the refrigerant flows in the header pipes 22 and 23 as shown by arrows f and g, and then is fed into the remaining heat transfer tubes 18 and 18 constituting the first and second core portions 20 and 21. And flows in the heat transfer tubes 18 and 18 as shown by arrows h and i, and is a part of the second and third header pipes 14 and 15 with respect to the second and third inlet chambers. It is sent to the part on the opposite side of the third partition wall 16, 17.

The refrigerant sent to the second and third header pipes 14 and 15 as described above flows through the header pipes 14 and 15 as indicated by arrows j and k, and is separated from the sixth header pipe 24. It is sent to half. Then, the refrigerant flows in the sixth header pipe 24 as indicated by the arrow l, and is then fed into the seventh and eighth header pipes 25, 26 from the other half of the sixth header pipe 24. .

The refrigerant sent from the other half of the sixth header pipe 24 to the seventh and eighth header pipes 25 and 26 flows through the header pipes 25 and 26 in the directions of arrows m and n. , The third and fourth core portions 29, 30 are fed into a part of the plurality of heat transfer tubes. Then, the refrigerant flows through the heat transfer tubes in the directions of arrows o and p and reaches the ninth and tenth header pipes 31 and 32.

The refrigerant sent into the ninth and tenth header pipes 31 and 32 flows in the header pipes 31 and 32 in the directions of arrows q and r, and the third and fourth core portions. Part of one of the seventh and eighth header pipes 25 and 26 is fed into the remaining heat transfer tubes of the plurality of heat transfer tubes constituting 29 and 30 and flows in each heat transfer tube as indicated by arrows s and t. Then, it is sent to a portion between the outlet chamber 4 and the fourth and fifth partition walls 27 and 28.

The refrigerant sent into the evaporator in a liquid state or a gas-liquid mixed state evaporates while flowing in the evaporator from the inlet chamber 3 toward the outlet chamber 4, and the volume gradually increases. The refrigerant flowing from the ninth and tenth header pipes 31, 32 to the seventh and eighth header pipes 25, 26 as shown by the arrows q, r is mostly gaseous and has the largest volume. It will be in the state of doing.

In consideration of this point, in the evaporator of the present invention, the installation positions of the fourth and fifth partition walls 27 and 28 are set to the sixth position rather than the central portions of the seventh and eighth header pipes 25 and 26. It is close to the header pipe 24 side. Therefore, as shown by the arrows q and r, the flow passage area of the refrigerant flowing from the ninth and tenth header pipes 31, 32 to the seventh and eighth header pipes 25, 26 is sufficiently secured, The flow resistance of the refrigerant does not increase and the performance of the evaporator does not deteriorate.

The refrigerant that has flowed through the seventh and eighth header pipes 25 and 26 in this manner flows through the header pipes 25 and 26 in the directions of arrows u and v, and reaches the outlet chamber 4. Then, as shown by the arrow w, the toner is delivered from the outlet chamber 4.

As described above, while the refrigerant flows from the inlet chamber 3 toward the outlet chamber 4 in the heat transfer tubes 18, 18 constituting the first to fourth core portions 20, 21, 29, 30, Heat exchange is performed between the refrigerant and the air flowing through the core parts 20, 21, 29, 30 to cool the air.

[0035]

[Effect of device]

 The evaporator of the present invention is constructed and operates as described above, but it can even out the flow of the refrigerant and prevent a part of the core from not performing heat exchange between the air and the refrigerant. The performance of the air conditioner incorporating the evaporator can be improved.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is a schematic perspective view for explaining the function of the evaporator of the present invention.

FIG. 3 is a front view showing a conventional evaporator.

FIG. 4 is a plan view of the same.

FIG. 5 is a schematic perspective view for explaining the function of a conventional evaporator.

6 is a schematic front view showing a biased state of the refrigerant in the core portion on the front side of FIG.

FIG. 7 is a schematic front view showing a biased state of the refrigerant in the adjacent core portion.

[Explanation of symbols]

 1 header pipe 2 partition wall 3 inlet chamber 4 outlet chamber 5, 5a, 5b header pipe 6 fins 7 heat transfer pipes 8, 8a, 8b header pipe 9 header pipe 10, 10a, 10b header pipe 11, 11a, 11b header pipe 12 first Header pipe 13 1st partition wall 14 2nd header pipe 15 3rd header pipe 16 2nd partition wall 17 3rd partition wall 18 Heat transfer tube 19 Fin 20 1st core part 21 2nd core part 22 4th Header pipe 23 Fifth header pipe 24 Sixth header pipe 25 Seventh header pipe 26 Eighth header pipe 27 Fourth partition wall 28 Fifth partition wall 29 Third core part 30 Fourth core part 31 Ninth header pipe 32 Tenth header pipe

Claims (1)

[Scope of utility model registration request] 1. An inlet chamber and an outlet chamber formed by partitioning an intermediate portion of a first header pipe whose both ends are opened by a first partition wall, and a part of the inlet chamber that is close to the opening of the inlet chamber. A second header pipe having one end connected to, a third header pipe having one end connected to the side close to the first partition in a part of the inlet chamber, and an intermediate portion of the second header pipe. A second partition wall for partitioning, and a middle of the third header pipe, a third partition wall for partitioning at a portion closer to the inlet chamber than the second partition wall, and one end of each partition wall is connected to the second header pipe. A first core portion including a plurality of heat transfer tubes and a plurality of fins sandwiched between adjacent heat transfer tubes, and a heat transfer tube adjacent to the plurality of heat transfer tubes each having one end connected to the third header pipe. It consists of multiple fins sandwiched between heat tubes. The second core portion provided in a state of being overlapped with the first core portion in the flow direction of the wind, and the other ends of the plurality of heat transfer tubes forming the first core portion are connected to each other and both ends are closed. The stripped fourth header pipe and the other ends of the plurality of heat transfer tubes forming the second core portion are connected to each other, and the fifth header pipe having both ends closed, and the second and third The other end of the header pipe is connected to one half thereof, and a sixth header pipe having both ends closed, and one end of each is connected to the sixth header pipe, and the other end of each is connected to the outlet chamber. The connected seventh and eighth header pipes, and a fourth partition wall that divides the part of the seventh header pipe closer to the sixth header pipe side from the center of the seventh header pipe in the middle of the seventh header pipe. , In the middle of the eighth header pipe, the sixth header pad above the center of the eighth header pipe. A fifth partition wall for partitioning a portion close to the side of the pipe, a plurality of heat transfer tubes each having one end connected to the seventh header pipe, and a plurality of fins sandwiched between adjacent heat transfer tubes. A third core portion provided in a state of being overlapped with the first and second core portions in the flow direction of the wind, and adjacent to a plurality of heat transfer tubes each having one end connected to the eighth header pipe. A plurality of fins sandwiched between matching heat transfer tubes, a fourth core portion provided in a state of being overlapped with the first to third core portions in the air flow direction, and the third core portion. The other ends of the plurality of heat transfer tubes forming the core part are connected, and the ninth header pipe having both ends closed and the other ends of the plurality of heat transfer tubes forming the fourth core part are connected, An evaporator having a tenth header pipe whose both ends are closed.