JP2009074768A - Heat exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat exchanger capable of suppressing the accumulation of a refrigerant in an inlet-side tank and an outlet-side tank and keeping cooling efficiency. <P>SOLUTION: This heat exchanger 1 comprises the inlet-side tank 2 to which the refrigerant before heat exchange is introduced, the outlet-side tank 3 from which the refrigerant after heat exchange is led out, and a plurality of cooling tubes 5 of which ends are inserted into the inlet-side tank 2 and the outlet-side tank 3, respectively, to make the inside of the inlet-side tank 2 communicate with the inside of the outlet-side tank 3, the ends of the cooling tubes 5 in the inlet-side tank 2 have opening end faces 51a, 51b, 51c, 52a, 52b, 52c and 54 opposed to the flowing direction of the refrigerant, the ends of the cooling tubes 5 in the outlet-side tank 3 have opening ends 55, 56a, 56b, 56c, 57a, 57b and 57c opened in the flowing direction of the refrigerant, and thus the accumulation of the refrigerant is suppressed and the cooling efficiency can be improved. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a heat exchanger that performs heat exchange between a low-temperature fluid and a high-temperature fluid.

  Conventionally, a heat exchanger that cools by heat exchange between a high-temperature fluid and a low-temperature fluid is known. The parallel flow heat exchanger is one of such heat exchangers, and performs heat exchange by passing a low-temperature fluid through a passage through which a high-temperature fluid (refrigerant) to be cooled passes. As such a parallel flow type heat exchanger, a cross flow type in which the refrigerant flows to the left and right and a down flow type structure in which the refrigerant flows up and down are known. Of these, downflow type parallel flow heat exchangers will be described as an example. The upper and lower tanks are connected by a plurality of cooling pipes, and the refrigerant passing through the cooling pipes is transferred from the upper tank (inlet side tank) to the lower part. To the other tank (exit side tank). The refrigerant is cooled by exchanging heat with the outside air ventilation while flowing through such a cooling pipe. Further, in such a heat exchanger, corrugated fins are provided in parallel between the cooling pipes, thereby increasing the heat radiation area and increasing the cooling effect of the refrigerant.

  An improved version of such a heat exchanger is disclosed in Patent Document 1. The heat exchanger of patent document 1 aims at prevention of the fall of heat exchange efficiency and generation | occurrence | production of noise by reducing the pressure loss of the refrigerant | coolant introduced from the introductory pipe.

Japanese Patent No. 3131063

  By the way, in the inlet side tank of such a heat exchanger, the refrigerant hardly flows into the cooling pipe provided at a position away from the inlet, and may stay in the tank. Similarly, in the outlet side tank, the flow toward the discharge port of the refrigerant discharged from the cooling pipe provided at a position away from the discharge port discharging the refrigerant from the outlet side tank may stagnate, and the refrigerant may stay. . As the refrigerant stays in the tank in this way, the amount of refrigerant flowing through the cooling pipe is reduced, so that it is conceivable that the cooling efficiency is lowered. Further, if the pressure loss due to such stay is large, it is considered that a load is applied to the pump used for circulating the refrigerant. The heat exchanger can be increased in size as a means for solving the pressure loss and the cooling efficiency decrease due to the retention of the refrigerant. However, the increase in the size of the device increases the cost and the space for mounting the device. Must be secured.

  Then, this invention makes it a subject to provide the heat exchanger which suppresses the retention of the refrigerant | coolant in an inlet side tank and an outlet side tank, and maintains cooling efficiency.

  The heat exchanger of the present invention that solves this problem includes an inlet side tank into which refrigerant before heat exchange is introduced, an outlet side tank from which refrigerant after heat exchange is led out, the inlet side tank, and the outlet side A plurality of cooling pipes that respectively end into the tank and communicate with the inside of the inlet side tank and the inside of the outlet side tank, and the end of the cooling pipe in the inlet side tank has a refrigerant An opening end face facing the flow direction is formed (claim 1). By setting it as such a structure, a refrigerant | coolant can flow smoothly into the opening edge part of a cooling pipe. Thereby, the stagnation of the refrigerant is eliminated and the refrigerant can be prevented from staying in the tank. Moreover, the pressure loss of the refrigerant can be reduced. The heat exchanger of the present invention is provided with at least one cooling pipe having such characteristics at the opening end.

  In such a heat exchanger, the opening end surface can be formed toward a refrigerant inlet side formed in the inlet side tank (Claim 2). With such a configuration, the opening end surface of the cooling pipe can be opposed to the flow of the refrigerant flowing from the inlet side, so that the refrigerant can easily flow into the cooling pipe.

  In particular, the opening end face in such a heat exchanger can be formed by obliquely cutting the cooling pipe in the inlet side tank (Claim 3). Further, the opening end face in such a heat exchanger can be formed by bending the cooling pipe in the inlet side tank toward the refrigerant inlet port formed in the inlet side tank (claim). Item 4).

  The heat exchanger that solves the problem in the present invention includes an inlet side tank into which refrigerant before heat exchange is introduced, an outlet side tank from which refrigerant after heat exchange is led out, the inlet side tank, and the outlet A plurality of cooling pipes that respectively end into the side tank and communicate with the inside of the inlet side tank and the inside of the outlet side tank, and the end of the cooling pipe in the outlet side tank includes a refrigerant. An opening end face that is open in the flow direction is formed (claim 5). By setting it as such a structure, the refrigerant | coolant derived | led-out from a cooling pipe can be distribute | circulated smoothly. Thereby, the flow rate of a refrigerant | coolant can be raised and it can suppress that a refrigerant | coolant retains in a tank.

  In such a heat exchanger, the opening end surface can be configured to open toward the refrigerant discharge port side formed in the outlet side tank (Claim 6). By setting it as such a structure, the refrigerant | coolant which flows out from a cooling pipe can be rapidly guide | induced to a discharge outlet.

  In particular, the opening end face in such a heat exchanger can be formed by obliquely cutting the cooling pipe in the outlet side tank (Claim 7). Further, the opening end face in such a heat exchanger can be formed by bending the cooling pipe in the outlet side tank toward the refrigerant discharge port side formed in the outlet side tank (claim). Item 8).

  Furthermore, in such a heat exchanger, a hole can be formed in the cooling pipe that has entered the tank on the inlet side. Due to the refrigerant passing through the cooling pipe, a pressure difference is generated between the inside and the outside of the cooling pipe, and the refrigerant is sucked from the outside to the inside of the cooling pipe through the holes thus provided. Thereby, the retention of the refrigerant around the cooling pipe can be suppressed. Such holes can also be slits.

  The heat exchanger according to the present invention includes an open end face formed in consideration of the direction of the refrigerant flow, thereby suppressing the stagnation of the refrigerant and improving the cooling efficiency.

  Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the drawings.

  Embodiment 1 of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing a schematic configuration of a heat exchanger 1 of the present embodiment. The heat exchanger 1 is a so-called radiator mounted on an automobile, and is a device that receives heat generated by the engine and cools the refrigerant that has become high temperature by exchanging heat with the atmosphere. The heat exchanger 1 includes an inlet side tank 2, an outlet side tank 3, and a radiator core 4.

  The inlet side tank 2 is formed with an inlet 2a to which an inlet pipe 11 through which a high-temperature refrigerant after cooling the engine flows is connected. The outlet side tank 3 is provided with a discharge port 3a connected to a lead-out pipe 12 for leading out the refrigerant.

  The radiator core 4 includes a cooling pipe 5, a corrugated fin 6, an upper plate 7, a lower plate 8, and a side frame 9. The radiator core 4 has a configuration in which corrugated fins 6 are arranged between a plurality of cooling pipes 5 arranged in parallel. An upper plate 7, a lower plate 8, and a side frame 9 surround and reinforce the periphery of the combination of the cooling pipes 5 and the corrugated fins 6. Such a radiator core 4 is assembled to the inlet side tank 2 and the outlet side tank 3 so that the cooling pipe 5 communicates between the inlet side tank 2 and the outlet side tank 3.

  In such a heat exchanger 1, the refrigerant flows in the directions indicated by arrows 20, 21, and 22. That is, the refrigerant flowing into the inlet side tank 2 from the introduction pipe 11 flows out of the inlet side tank 2 through the cooling pipes 5 to the outlet side tank 3. The refrigerant reaching the outlet side tank 3 is discharged to the outlet pipe 12. The refrigerant circulating in this way is cooled by exchanging heat with the air passing through the gaps between the corrugated fins 6 when passing through the cooling pipe 5. Next, details of the heat exchanger 1 will be described.

  FIG. 2 is an explanatory view showing a portion of the inside of the inlet side tank 2 in the vicinity of the inlet 2a shown in FIG. FIG. 3 is a side view of the tip of the cooling pipe 5 in FIG. 2 as viewed from the arrow 14 side. The arrow 20 shown in FIG. 2 and FIG. 3 has shown the direction in which a refrigerant | coolant is introduce | transduced from the inlet 2a. As shown in FIG. 2, the end of the cooling pipe 5 is assembled so as to enter the inlet side tank 2. The cooling pipes 5 are arranged in two rows along the air circulation direction. A plurality of such two rows of cooling pipes are arranged in the width direction. Among these cooling pipes 5, the open end faces 51a, 51b, 51c, 52a, 52b, 52c of the three sets of cooling pipes 5 on the end side where the introduction port 2a is arranged are in the direction in which the refrigerant is introduced, that is, It is formed by being cut obliquely so that the cut surface faces the introduction port 2a side. Furthermore, as shown in FIG. 3, the opening end faces 51a, 51b, 51c of the cooling pipes 5 arranged in the row far from the introduction port 2a are the opening end faces 52a of the cooling pipes 5 arranged in the row near the introduction port 2a. Compared to 52b and 52c, the inclination angle of the slope is formed larger. In this way, the cooling pipe 5 is cut obliquely, and the opening end faces 51a, 51b, 51c, 52a, 52b, 52c are formed so as to face the refrigerant flow direction. It becomes easy to flow into the cooling pipe 5. For this reason, it is suppressed that a refrigerant | coolant retains in the inlet side tank 2. FIG. In addition, the pressure loss is reduced by smoothly flowing the refrigerant. In addition, the opening end surface 53 of the cooling pipe 5 which is not located in the side by which the inlet 2a is arrange | positioned is flat.

  Next, the end of the cooling pipe 5 provided at a position away from the introduction port 2 will be described. FIG. 4 is an explanatory view of the heat exchanger 1 showing the inlet side tank 2 and the outlet side tank 3 in cross section. The refrigerant introduced into the inlet side tank 2 from the inlet 2a and not flowing into the opening end faces 51a, 51b, 51c, 52a, 52b, 52c is the width of the inlet side tank 2 as shown by an arrow 24 in FIG. Flow in the direction. The cooling pipe 5 provided on the end side where the introduction port 2a as shown by the arrow 15 in FIG. 4 is not arranged is a direction in which the opening end surface 54 faces the refrigerant flow direction (arrow 24), That is, it is bent toward the inlet 2a side. FIG. 5 is an explanatory view showing details of such a cooling pipe 5. An arrow 24 in FIG. 5 indicates the direction of the refrigerant flow. In a place away from the introduction port 2a, the refrigerant flows in a direction as indicated by an arrow 24. For this reason, the cooling pipe 5 provided on the end side where the introduction port 2a is not disposed bends the tip so that the opening end face 54 faces the refrigerant flow, and the refrigerant flows into the cooling pipe. The structure is easy. In this embodiment, the two ends of the cooling pipes 5 are bent from the end on the side where the introduction port 2a is not arranged.

  Furthermore, as shown in FIG. 5, the slit 13 is formed in the cooling pipe 5 in which the opening end surface 54 is bent toward the refrigerant flow direction. The slit 13 is a suction hole for sucking the refrigerant from the outside to the inside of the cooling pipe 5 using a differential pressure generated between the inside and the outside of the cooling pipe 5 when the refrigerant flows in the cooling pipe 5. . Providing such a slit 13 causes a flow in the refrigerant that is likely to stay because it is away from the inlet 2a, so that the refrigerant is prevented from staying.

  Next, the shape of the cooling pipe 5 on the outlet side tank 3 side will be described. The cooling pipe 5 that has entered the outlet side tank 3 has the same shape as the cooling pipe 5 that has entered the inlet side tank 2. The two sets of cooling pipes 5 provided on the end side where the discharge port 3a is not disposed are bent toward the discharge port 3a side with the opening end surface 55 opened in the refrigerant flow direction. By bending the tip of the cooling pipe 5, the refrigerant flowing out from the opening end surface 55 flows out toward the discharge port 3. Further, the refrigerant in the outlet side tank 3 flows toward the discharge port 3 as indicated by an arrow 25 in FIG. Since the refrigerant flowing out from the cooling pipe 5 having the bent tip can smoothly merge with the refrigerant flowing in the outlet side tank 3, the pressure loss of the flow is reduced.

  Similarly, the cooling pipe 5 provided on the end side where the discharge port 3a is disposed has the opening end surfaces 56a, 56b, 56c cut obliquely so that the cut surfaces face the discharge port 3a side. , 57a, 57b, 57c. FIG. 6 is an explanatory view showing the tip of the cooling pipe 5 provided on the end side where the discharge port 3a is arranged. The arrow 22 in FIG. 6 is the direction in which the refrigerant flows. The opening end faces 56a, 56b, 56c of the cooling pipes 5 arranged in the row far from the discharge port 3a are inclined as compared with the opening end faces 57a, 57b, 57c of the cooling pipes 5 arranged in the row near the discharge port 3a. A large angle is formed. Thus, by providing the opening end faces 56a, 56b, 56c, 57a, 57b, 57c, the refrigerant flowing out of the cooling pipe 5 is easily led out to the discharge port 3a. Thereby, since a refrigerant | coolant stays in the exit side tank 3 is suppressed, the flow of a refrigerant | coolant becomes smooth and the pressure loss of a refrigerant | coolant reduces.

  As described above, the heat exchanger 1 according to the present invention forms the opening end surface of the cooling pipe 5 in consideration of the flow direction, so that the flow of the refrigerant can be made smooth and the pressure loss of the refrigerant can be reduced. it can. Thereby, since the refrigerant | coolant amount which passes the cooling pipe 5 increases, a cooling effect can be improved. In this embodiment, there are two sets of cooling pipes bent in the inlet side tank 2 and the outlet side tank 3, but the number of cooling pipes bent in this way may be any number.

  Next, a second embodiment of the present invention will be described. The heat exchanger 31 of the present embodiment has substantially the same configuration as the cooling device 1 of the first embodiment. However, the heat exchanger 1 is different from the heat exchanger 1 in that the shape of the opening end face of the cooling pipe 32 entering the inlet side tank 2 and the outlet side tank 3 is different from that of the cooling pipe 5 of the first embodiment. In addition, since the other structure is the same as Example 1, about the component same as Example 1, the same reference number is attached | subjected in drawing and the detailed description is abbreviate | omitted.

  FIG. 7 is an explanatory diagram of the heat exchanger 31 showing the inlet side tank 2 and the outlet side tank 3 of this embodiment in cross section. The opening end surface of the cooling pipe 32 provided on the end side of the inlet side tank 2 on the side where the introduction port 2a is arranged is provided on the end side of the inlet side tank 2 on the side where the introduction port 2a is arranged. The open end faces 51a, 51b, 51c, 52a, 52b, 52c of the cooling pipe 5 thus configured have the same configuration. The opening end surface of the cooling pipe 32 provided on the end side of the outlet side tank 3 where the discharge port 3a is disposed is the end side of the outlet side tank 3 of the outlet side tank 3 on the side where the discharge port 3a is disposed. It has the same configuration as the open end faces 56a, 56b, 56c, 57a, 57b, 57c of the cooling pipe 5 provided in the above.

  In the present embodiment, the opening end surface 58 of the cooling pipe 32 that is not located on the side where the inlet 2a on the inlet side tank 2 side is disposed has a slope so as to face the refrigerant flow direction. That is, the opening end surface 58 is formed toward the introduction port 2a. As a result, as indicated by an arrow 26 in FIG. 7, the refrigerant flowing in the lateral direction in the inlet side tank 2 is easily flown into the cooling pipe 32.

  Further, the opening end surface 59 of the cooling pipe 32 that is not located on the side where the discharge port 3a on the outlet side tank 3 side is disposed has a slope so as to be open to the flow of the refrigerant. That is, the opening end surface 59 is formed toward the discharge port 3a. Thereby, the cooling water flowing out from the cooling pipe 32 can smoothly join the refrigerant flowing laterally through the outlet side tank 3 as shown by an arrow 27 in FIG.

  As described above, the heat exchanger 31 of the present embodiment forms the opening end face of the cooling pipe 32 in consideration of the flow direction, so that the flow of the refrigerant is made smooth and the pressure loss of the refrigerant is reduced. Can do. Thereby, since the refrigerant | coolant amount which passes the cooling pipe 32 increases, a cooling effect can be improved.

  The above-described embodiments are merely examples for carrying out the present invention, and the present invention is not limited thereto. Various modifications of these embodiments are within the scope of the present invention. It is apparent from the above description that various other embodiments are possible within the scope.

It is the perspective view which showed schematic structure of the heat exchanger of Example 1. FIG. It is explanatory drawing which perspectively showed and showed a part inside inlet side tank near an inlet. It is the side view which looked at the front-end | tip part of the cooling pipe in FIG. 2 from the arrow 14 side. It is explanatory drawing of the heat exchanger which showed the inlet side tank and outlet side tank of Example 1 in the cross section. It is explanatory drawing which showed the cooling pipe provided in the position away from the inlet. It is explanatory drawing which showed the front-end | tip part of the cooling pipe 5 provided in the end side of the side by which the discharge outlet is arrange | positioned. It is explanatory drawing of the heat exchanger which showed the inlet side tank and outlet side tank of Example 2 in the cross section.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Heat exchanger 2 Inlet side tank 2a Inlet port 3 Outlet side tank 3a Discharge port 4 Radiator core 5, 32 Cooling pipe 6 Corrugated fin 11 Introducing pipe 12 Outlet pipe 13 Slit 51, 52, 53, 54, 55, 56, 57 , 58, 59 Opening end face of cooling pipe

Claims (9)

An inlet side tank into which refrigerant before heat exchange is introduced;
An outlet side tank from which the refrigerant after heat exchange is led out;
A plurality of cooling pipes each having an end projecting into the inlet side tank and the outlet side tank, and communicating between the inlet side tank and the outlet side tank;
An end face of the cooling pipe in the inlet side tank is formed with an open end face facing the refrigerant flow direction. The heat exchanger according to claim 1, wherein
The heat exchanger according to claim 1, wherein the opening end surface is formed toward a refrigerant inlet side formed in the inlet side tank. The heat exchanger according to claim 1, wherein
The open end face is formed by obliquely cutting the cooling pipe in the inlet side tank. The heat exchanger according to claim 1, wherein
The open end surface is formed by bending the cooling pipe in the inlet side tank toward a refrigerant inlet side formed in the inlet side tank. An inlet side tank into which refrigerant before heat exchange is introduced;
An outlet side tank from which the refrigerant after heat exchange is led out;
A plurality of cooling pipes each having an end projecting into the inlet side tank and the outlet side tank, and communicating between the inlet side tank and the outlet side tank;
An end face of the cooling pipe in the outlet side tank is formed with an open end face opened in a refrigerant flow direction. The heat exchanger according to claim 5, wherein
The heat exchanger according to claim 1, wherein the opening end surface is opened toward a refrigerant discharge port formed in the outlet side tank. The heat exchanger according to claim 5, wherein
The open end face is formed by obliquely cutting the cooling pipe in the outlet side tank. The heat exchanger according to claim 5, wherein
The open end surface is formed by bending the cooling pipe in the outlet side tank toward a refrigerant discharge port side formed in the outlet side tank. The heat exchanger according to claim 1 or 5,
A heat exchanger characterized in that a hole is formed in the cooling pipe that has entered the inlet side tank.

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