JP2012132616A - Heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat exchanger capable of reducing a load on a heat exchanger tube.SOLUTION: A core case 47 includes a first case 33 integrally extending from a first end plate 32, and a second case 36 integrally extending from a second end plate 35 and joined to the first case 33. The heat exchanger tube 31 has one end fitted and welded to the first end plate 32 and the other end of the heat exchanger tube 31 is fitted and welded to the second end plate 35. The heat exchanger tube 31 which is fitted and then welded to the first and second end plates 32, 35 has no need to provide a diameter enlarged part therefor. No existence of the diameter enlarged part reduces a load to be received from a first heat medium or a second heat medium, namely reducing the load on the heat exchanger tube 31.

Description

  The present invention relates to a heat exchanger that transfers heat of a first heat medium to a second heat medium.

  While the vehicle is running, exhaust gas is generated from the internal combustion engine. Water is heated by giving the heat retained by the exhaust gas to water (see, for example, Patent Document 1 (FIGS. 2 and 11)).

Patent document 1 is demonstrated based on the following figure.
As shown in FIG. 8, the heat exchanger 100 includes a plurality of heat exchange tubes 102 having enlarged diameter portions 101, 101 that are enlarged at both ends, a lower case 103 and an upper portion that house these heat exchange tubes 102. Case 104 is formed.

  A plurality of heat exchange tubes 102 are stacked such that the enlarged diameter portions 101 and 101 are overlapped with each other. The heat exchanger 100 is assembled by housing the stacked heat exchange tubes 102 in the lower case 103 and covering the upper case 104 from above the lower case 103.

  By configuring the heat exchanger 100 with the heat exchange tube 102 and the lower and upper cases 103 and 104, the number of parts can be reduced. Since the number of parts is small, fewer man-hours are required for assembly.

  As shown in FIG. 9A, the exhaust gas flowing from the left to the right in the drawing passes through the heat exchange tube 102 and is discharged out of the heat exchanger 100. Cooling water flows between the heat exchange tube 102 and the heat exchange tube 102, and the heat of the exhaust gas is transmitted to the cooling water.

As shown to (b) which is the b section enlarged view of (a), the heat exchange tubes 102 and 102 receive a pressure from cooling water. In particular, in the vicinity of the enlarged diameter portions 101 and 101, the water pressure acts in the direction in which the heat exchange tubes 102 and 102 are separated as indicated by the white arrows.
Further, stress is generated when the exhaust gas passes through the points a, b, c, and d near the enlarged diameter portions 101 and 101.

That is, a high load is applied to the heat exchange tube from the first heat medium such as exhaust gas and the second heat medium such as cooling water.
It is desirable to provide a heat exchanger that can reduce the load on the heat exchange tube.

JP 2007-225190 A

  This invention makes it a subject to provide the heat exchanger which can reduce the load concerning a heat exchange tube.

The invention according to claim 1 is provided so as to face the first end plate, a heat exchange tube through which the first heat medium flows, a first end plate that penetrates and supports one end of the heat exchange tube. A second end plate that penetrates and supports the other end of the heat exchange tube, and a core case that is provided from the outer edge of the first end plate toward the outer edge of the second end plate and surrounds the heat exchange tube; A heat exchanger for exchanging heat with the second heat medium that flows around the outer periphery of the heat exchange tube,
The core case includes a first case integrally extended from the first end plate and a second case integrally extended from the second end plate and joined to the first case.
One end of the heat exchange tube is fitted and welded to the first end plate, and the other end of the heat exchange tube is fitted and welded to the second end plate.

In the invention according to claim 2, an attachment portion for attaching the thermoactuator is integrally provided on the side portion of the first case,
The side part of a 2nd case is integrally provided with the cover part fitted to an attaching part, It is characterized by the above-mentioned.

According to a third aspect of the present invention, the first end plate includes a first fitting portion into which one end of the heat exchange tube is fitted, and a first fold that is bent along the heat exchange tube from the first fitting portion. A bending portion,
The second end plate has a second fitting portion into which the other end of the heat exchange tube is fitted, and a second bent portion that is bent along the heat exchange tube from the second fitting portion. It is characterized by being.

  The invention according to claim 4 is characterized in that fins are arranged in the heat exchange tube.

  In the invention according to claim 1, one end of the heat exchange tube is fitted and welded to the first end plate, and the other end is fitted and welded to the second end plate. That is, the heat exchange tube is welded after both ends are fitted to the first and second end plates. Since it is welded after being fitted to the first and second end plates, it is not necessary to provide an enlarged diameter portion in the heat exchange tube. Since there is no enlarged diameter part, the load received from a 1st heat medium or a 2nd heat medium can be reduced. That is, the load on the heat exchange tube can be reduced.

In addition, the core case is formed by joining the second case to the first case. A first end plate is integrally formed on the first case, and a second end plate is integrally formed on the second case. By forming the first and second end plates integrally with the first and second cases, the number of parts can be reduced.
According to the invention which concerns on Claim 1, although it is a heat exchanger with few parts count, the load concerning a heat exchange tube can be reduced.

  In the invention which concerns on Claim 2, the attaching part for attaching a thermo actuator is integrally provided in the side part of a 1st case. The number of parts can be reduced as compared with the case where a separate member is provided to support the thermoactuator. Further, the thermoactuator can be provided closer to the core case, and the size can be reduced.

  In the invention which concerns on Claim 3, the 1st, 2nd bending part bent along a heat exchange tube was provided. First and second bent portions are provided to support the heat exchange tube. The heat exchange tube is supported on the surface by the first and second end plates. By supporting the heat exchange tube on the surface, the strength to support the heat exchange tube is increased. By increasing the strength to support the heat exchange tube, the life of the heat exchanger can be extended.

  In the invention which concerns on Claim 4, the fin is arrange | positioned in the heat exchange tube. By arranging the fins, the efficiency of transferring the heat of the first heat medium to the second heat medium can be increased.

1 is a perspective view of an exhaust heat recovery apparatus equipped with a heat exchanger according to the present invention. It is a disassembled perspective view of the heat exchanger which concerns on this invention. It is a perspective view of the heat exchanger which concerns on this invention. It is a figure explaining the creation procedure of an upstream case body. It is operation | movement explanatory drawing of the heat exchanger which concerns on this invention. It is explanatory drawing which compared this invention and the prior art. It is a figure explaining the example of a change of FIG. It is a figure explaining the basic composition of the conventional technology. It is a figure explaining the problem of the prior art.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. The drawings are viewed in the direction of the reference numerals.

  As shown in FIG. 1, the exhaust heat recovery apparatus 10 includes an introduction member 11 into which exhaust gas (first heat medium, the same applies hereinafter) is introduced, and a downstream side of the introduction member 11 (the flow direction of the exhaust gas is changed). A detour port 12 provided in the detour port 12, which is connected to the detour port 12 and detours the exhaust gas, and a gas inflow member 15 which is connected to the heat recovery port 14 above the introduction member 11. A rectangular front support 16 integrally formed at the downstream end of the gas inflow member 15 and cooling water (second heat medium, hereinafter) The same)), a rear support portion 21 that supports the downstream end of the heat exchanger 30, and exhaust gas that is provided integrally with the rear support portion 21 and has finished heat exchange is discharged. Provided on the side of the gas outlet member 22 and the heat exchanger 30 to be cooled. A water discharge pipe 23 through which water is discharged, a thermoactuator 24 that is supported by the heat exchanger 30 and is operated at the temperature of the cooling water, and a biasing force that contacts the tip of the thermoactuator 24 and biases it clockwise in the drawing. A means 25 and a valve 27 which is attached to the shaft 26 of the urging means 25 and switches the flow path of the exhaust gas by closing the bypass port 12 or the heat recovery port 14.

  In a state where the water temperature is low, such as immediately after the operation of the vehicle, the valve 27 closes the bypass 12. When the bypass port 12 is closed, the exhaust gas flows toward the heat recovery port 14. The exhaust gas flowing to the heat recovery port 14 is sent to the heat exchanger 30 via the gas inflow member 15 to warm the cooling water.

When the water temperature rises and reaches a predetermined temperature, the thermoactuator 24 operates. By actuating the thermoactuator 24, the rod 28 provided at the tip of the thermoactuator 24 moves forward (left side in the drawing) against the urging force of the urging means 25. As the rod 28 moves forward, the shaft 26 and the valve 27 rotate integrally in the counterclockwise direction. By rotating, the valve 27 closes the heat recovery port 14.
That is, the valve 27 closes the heat recovery port 14 when the water temperature reaches a predetermined temperature.

While the valve 27 closes the heat recovery port 14, the exhaust gas flows through the bypass 13 and does not perform heat exchange. When the water temperature falls again, the valve 27 is rotated clockwise by the force of the biasing means 25, and the valve 27 closes the bypass port 12. Heat exchange is performed again by closing the bypass 12 and opening the heat recovery port 14.
Details of the heat exchanger 30 that performs heat exchange will be described with reference to the following drawings.

  As shown in FIG. 2, the heat exchanger 30 includes a plurality of heat exchange tubes 31 through which exhaust gas flows, and a substantially rectangular first end plate 32 that penetrates and supports one end of these heat exchange tubes 31. A first case 33 that extends integrally from the first end plate 32; a mounting portion 34 that is integrally formed on a side portion of the first case 33 and for mounting a thermoactuator (FIG. 1, reference numeral 24); A second end plate 35 that penetrates and supports the other end of the heat exchange tube 31, a second case 36 that is integrally extended from the second end plate 35 and joined to the first case 33, and the second case 36 And a lid portion 37 that covers the rear portion of the attachment portion 34.

  The first end plate 32 is formed with a first bent portion 41 that is bent in a direction opposite to the direction in which the exhaust gas flows, and the second end plate 35 is bent in the direction in which the exhaust gas flows. A bent portion 42 is formed.

  The first end plate 32 is fitted to one end (upstream end) of the heat exchange tube 31, and the second end plate 35 is fitted to the other end (downstream end) of the heat exchange tube 31. After being fitted to the heat exchange tube 31, the first and second end plates 32 and 35 are pushed into each other until the first case 33 is fitted to the second case.

When the first case 33 contacts the second case 36, the first case 33 is welded to the second case 36. Further, the heat exchange tube 31 is welded to the first and second end plates 32 and 35.
The details of the heat exchanger completed by welding will be described with reference to the following figure.

As shown in FIG. 3, the heat exchanger 30 forms an introduction portion 44 for introducing cooling water between a lower portion of the first case 33 and a lower portion of the second case 36, and a water discharge pipe (FIG. 1, A discharge portion 45 that supports the reference numeral 23) is formed in the lid portion 37.
The introduction part 44 includes a first introduction part 44 a formed in the first case 33 and a second introduction part 44 b formed in the second case 36.

  A core case 47 formed by joining the first case 33 and the second case 36 is provided from the outer edge of the first end plate 32 toward the outer edge of the second end plate (FIG. 1, reference numeral 35).

The heat exchange tube 31 is provided with fins 48.
By arranging the fins 48, the efficiency of transferring the heat of the first heat medium to the second heat medium can be increased.

  Such a heat exchanger 30 includes a first end plate 32, a first case 33, a first introduction portion 44a, an upstream case body 49 integrally formed with a mounting portion 34, and a second end plate (see FIG. 35), the downstream case body 51 in which the second case 36, the lid portion 37, the discharge portion 45, and the second introduction portion 44b are integrally formed, and the upstream case body 49 and the downstream case body 51 are supported. It can be paraphrased to consist of a plurality of heat exchange tubes 31.

  Since it consists of the upstream case body 49, the downstream case body 51, and the heat exchange tube 31, the heat exchanger 30 can be manufactured with few parts. Since the number of parts is small, the number of steps required for assembly is small, which is beneficial.

The first case 33 is integrally formed with the first end plate 32, and the second case 36 is integrally formed with the second end plate 35 (see FIG. 2). By forming the first and second end plates 32 and 35 integrally with the first and second cases 33 and 36, the number of parts can be reduced.
The procedure for creating the upstream case body will be described with reference to the following figure.

As shown in FIG. 4A, first, the plate material is drawn and the upstream case body (FIG. 3, reference numeral 49) is formed into a rough shape.
The compact 53 formed into a rough shape is further drawn and formed into a detailed compact 54 as shown in FIG.

Next, as shown in (c), a holed molded body 55 is obtained by opening a hole for fitting the heat exchange tube (FIG. 3, reference numeral 31).
The first bent portion 41 is formed by raising the peripheral portion of the hole 56 of the formed body 55 with the hole formed as shown in FIG.

Of the molded body 57 in which the first bent portion 41 is formed, an unnecessary portion 58 is cut out to obtain a molded body 59 in which an unnecessary portion shown in FIG.
As shown in (f), the mounting portion 34 and the first introduction portion 44a are formed in the formed body 59 from which unnecessary portions have been excised, thereby completing the upstream case body 49.

  The attachment portion 34 is integrally provided on the side portion of the first case 33. The number of parts can be reduced as compared with the case where a separate member is provided to support the thermoactuator (FIG. 1, reference numeral 24). Further, the thermoactuator can be further provided in the vicinity of the core case (FIG. 3, reference numeral 47), and the size can be reduced.

In addition, since a downstream case body (FIG. 3, code | symbol 51) can also be manufactured in the procedure similar to having demonstrated above, detailed description is omitted.
The operation of the heat exchanger according to the present invention will be described with reference to the following figure.

  As shown in FIG. 5A, the first end plate 32 includes a first fitting portion 61 into which one end of the heat exchange tube 31 is fitted, and the first end plate 32 along the heat exchange tube 31 from the first fitting portion 61. The second end plate 35 includes a second fitting portion 62 into which the other end of the heat exchange tube 31 is fitted, and the second fitting portion 62. And a second bent portion 42 that is bent along the heat exchange tube.

  The 1st, 2nd bending parts 41 and 42 are provided and a heat exchange tube is supported. The heat exchange tube 31 is supported by the first and second end plates 32 and 35 on the surface. By supporting the heat exchange tube 31 on the surface, the strength for supporting the heat exchange tube 31 is increased. Since the strength for supporting the heat exchange tube 31 is increased, the life of the heat exchanger 30 can be extended.

The base 41a, which is the end of the first bent portion 41 on the second case 36 side, has a curved surface shape as shown in FIG. By making the base part 41a into a curved surface shape, the strength for supporting the heat exchange tube 31 can be further increased.
The root portion 42a, which is the end portion of the second bent portion 42 on the first case 33 side, shown in (a) also has a curved surface shape, and has the same effect as the root portion 41a.

  As shown in the conventional example of FIG. 6A, the heat exchange tubes 102 and 102 receive pressure from the cooling water. In particular, in the vicinity of the enlarged diameter portions 101 and 101, the water pressure acts in the direction in which the heat exchange tubes 102 and 102 are separated as indicated by the white arrows.

As shown in the embodiment (b), the heat exchange tube 31 is welded after both ends are fitted to the first and second end plates 32 and 35. Since it is welded after being fitted to the first and second end plates 32, 35, it is not necessary to provide a diameter-expanded portion in the heat exchange tube 31. By eliminating the need for the enlarged diameter portion, it is possible to reduce the load received from the first heat medium and the second heat medium. That is, the load applied to the heat exchange tube 31 can be reduced.
According to the present invention, the load applied to the heat exchange tube 31 can be reduced while the heat exchanger has a small number of parts.

As shown in FIG. 7, the first bent portion 64 is bent toward the inside of the first case 65, the second bent portion (FIG. 5, reference numeral 42) is not provided in the second case 66, and the second fitting portion The heat exchange tube 31 is supported by 67 alone. Even when the first and second cases 65 and 66 are formed as described above, the effect of the present invention can be obtained.
That is, the direction in which the bent portion is bent and the presence or absence of the bent portion are arbitrary, and may be different between the first case 65 and the second case 66.

  However, when the first bent portion 64 is bent toward the inside of the first case 65, the first case 65 can be made smaller than when the first bent portion 64 is bent toward the outside of the first case 65.

  When the second case 66 is not provided with the second bent portion, the heat exchange tube 31 protrudes from the downstream end of the second case 66 and a step is generated. Since there is a step, the welding torch can easily face and the heat exchange tube 31 can be easily welded.

  In addition, a matching portion 68 having a substantially L-shaped cross-sectional view extending in the circumferential direction is provided at the downstream end of the first case 65. The first case 65 is welded to the second case 66 after the mating portion 68 is placed on the upstream end of the second case 66. The step generated between the first case 65 and the second case 66 facilitates the welding operation.

The mating portion 68 can also be provided in the second case 66. In other words, it can be arbitrarily selected which case is provided with the matching portion.
Moreover, the welding of the 1st, 2nd cases 65 and 66 and the heat exchange tube 31 can select arbitrary methods, such as brazing other than TIG welding.

  In addition, although the heat exchanger which concerns on this invention was applied to the exhaust-heat recovery apparatus in embodiment, it is applicable also to an EGR (Exhaust Gas Recirculation) cooler, A use is not restricted to these things.

  The heat exchanger of the present invention is suitable for an exhaust heat recovery apparatus.

  DESCRIPTION OF SYMBOLS 30 ... Heat exchanger, 31 ... Heat exchange tube, 32 ... 1st end plate, 33, 65 ... 1st case, 34 ... Mounting part, 35 ... 2nd end plate, 36, 66 ... 2nd case, 37 ... Cover , 41, 64: first bent portion, 42: second bent portion, 47: core case, 48: fin, 61: first fitting portion, 62, 67: second fitting portion.

Claims (4)

A heat exchange tube through which the first heat medium flows, a first end plate penetrating and supporting one end of the heat exchange tube, and the other end of the heat exchange tube provided to face the first end plate A second end plate that penetrates and supports, and a core case that is provided from an outer edge of the first end plate toward an outer edge of the second end plate and surrounds the heat exchange tube, the first heat medium, and the heat A heat exchanger for exchanging heat with a second heat medium flowing around the outer periphery of the exchange tube,
The core case includes a first case integrally extended from the first end plate and a second case integrally extended from the second end plate and joined to the first case.
One end of the heat exchange tube is fitted and welded to the first end plate, and the other end of the heat exchange tube is fitted and welded to the second end plate. vessel. A mounting portion for mounting the thermoactuator is integrally provided on the side of the first case,
The heat exchanger according to claim 1, wherein a lid portion that fits into the attachment portion is integrally provided on a side portion of the second case. The first end plate has a first fitting portion into which one end of the heat exchange tube is fitted, and a first bent portion that is bent along the heat exchange tube from the first fitting portion. And
The second end plate includes a second fitting portion into which the other end of the heat exchange tube is fitted, and a second bent portion to be bent along the heat exchange tube from the second fitting portion. The heat exchanger according to claim 1, wherein the heat exchanger is provided.   The heat exchanger according to any one of claims 1 to 3, wherein fins are arranged in the heat exchange tube.

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