JP2002070528A - Cooling device for exhaust gas - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cooling device for exhaust gas increasing the capacity for cooling the exhaust gas while the size is made small. SOLUTION: This cooling device for exhaust gas is equipped with a box body 1 having a hollow chamber 16 communicating with a gas inlet port 11 into which exhaust gas is introduced and a gas outlet port from which the exhaust gad is exhausted; and a cooling means arranged in the hollow chamber 16 and cooling the exhaust gas introduced into the hollow chamber 16. The cooling means is formed with a spiral pipe group 6. The spiral pipe group 6 is constituted by arranging in series plural spiral pipes 5 (5a, 5b, 5c, 5d, 5e) spirally wound on the inside of the same assumed plane, inside which a coolant flows, in the direction perpendicularly crossing to the radius direction of the spiral. Thereby, the heat transfer area of the spiral pipe group 6 is increased.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust gas cooling device having a function of cooling exhaust gas for noise reduction or the like. The present invention is applicable to, for example, an exhaust gas cooling device that can be used in a cogeneration system, a vehicle, and the like.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG.
01 in the peripheral wall 102 and a straight exhaust pipe 100 through which the exhaust gas flows is disposed in the hollow chamber 201 of the box 200, and the cooling water pipe 300 is spirally wound around the outer circumference of the exhaust pipe 100. A silencer having a cooling function is known (Japanese Utility Model Publication No. 58-29114, Publication 19).
February 25, 1983). In this case, the cooling water pipe 3
00 is spirally wound along the length direction of the exhaust pipe 100 so as to have a predetermined spiral advance angle, and is disposed so as to sequentially advance along the length direction of the exhaust pipe 100. Since the high-temperature and high-pressure exhaust gas in the exhaust pipe 100 is cooled by the cooling water flowing through the cooling water pipe 300, the effect of reducing noise due to the exhaust gas can be exhibited.

[0003]

In the above-described technique, the cooling water pipe 300 is arranged so as to spirally progress sequentially along the length of the exhaust pipe 100. Has limitations. Therefore, the cooling water pipe 30
No. 0 also has a limited ability to cool the exhaust gas of the exhaust pipe 100. In order to increase the ability of the cooling water pipe 300 to cool the exhaust gas, the cooling water pipe 300 may be spirally wound for a long distance. However, the size of the apparatus increases in the spiral traveling direction, and the entire apparatus increases in size. Invite.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to provide an exhaust gas cooling device that can increase the ability to cool exhaust gas while reducing the size.

[0005]

SUMMARY OF THE INVENTION An exhaust gas cooling apparatus according to the present invention has a box body having a gas inlet through which exhaust gas is introduced, a gas outlet through which exhaust gas is led, and a hollow chamber communicating the two. And a cooling unit disposed in the hollow chamber of the box and cooling the exhaust gas introduced into the hollow chamber, wherein the cooling unit is spirally wound in the same virtual plane. It is characterized in that it is formed of a group of spiral tubes in which a plurality of spiral tubes through which a cooling medium flows are arranged in series in a direction intersecting the radial direction of the spiral.

[0006] Exhaust gas is introduced into the hollow chamber from the gas inlet of the box, and is drawn out of the apparatus from the gas outlet. Since a cooling medium such as cooling water flows through the spiral tubes of the spiral tube group constituting the cooling means, the exhaust gas introduced into the hollow chamber is cooled by each spiral tube. Thereby, the volume of the exhaust gas introduced into the hollow chamber is reduced, and the noise due to the exhaust gas is reduced. The spiral tubes are spirally wound in the same virtual plane, and a spiral tube group is configured by arranging a plurality of spiral tubes in series along a direction intersecting the radial direction of the spiral. In addition, while the increase in the axial length of the spiral tube group is suppressed, the exposed area of the spiral tube group, that is, the heat transfer area is increased.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention, the following embodiments can be adopted. These embodiments can be described as claims. The cooling means is constituted by arranging a plurality of spiral tubes which are spirally wound in the same virtual plane and through which a cooling medium such as a cooling liquid flows, in series along a direction intersecting the radial direction of the spiral. It is formed by a group of spiral tubes. in this case,
Considering the reduction in the diameter of the spiral tube group and productivity,
Preferably, each spiral tube is provided in a concentric arrangement. The number of spiral tubes arranged in series is not particularly limited,
The number can be appropriately selected according to the capacity required of the exhaust gas cooling device and the like. For example, the number can be 2 to 100, 2 to 50, and 3 to 20. As the cooling medium, a cooling liquid such as cooling water is preferable. The cooling medium such as a cooling liquid may be supplied into the spiral tube from the outer peripheral side of the spiral tube, or may be supplied into the spiral tube from the inner peripheral side of the spiral tube. Although a plurality of spiral tubes are arranged in series, in the first spiral tube arranged on the upstream side where the cooling medium flows, the cooling medium is supplied from the inner peripheral side of the spiral and discharged from the outer peripheral side, and the first spiral tube is discharged. In the second spiral tube adjacent to the spiral tube, the cooling medium is supplied from the outer peripheral side of the spiral and is discharged from the inner peripheral side, and in the third spiral tube adjacent to the second spiral tube, the A mode in which the cooling medium is supplied from the inner peripheral side and discharged from the outer peripheral side, and this is repeated thereafter can be adopted. Alternatively, in the first spiral tube arranged on the upstream side where the cooling medium flows, the cooling medium is supplied from the outer peripheral side of the spiral and discharged from the inner peripheral side, and the second spiral tube adjacent to the first spiral tube is provided. In the pipe, the cooling medium is supplied from the inner peripheral side of the spiral and is discharged from the outer peripheral side, and in the third spiral pipe adjacent to the second spiral pipe, the cooling medium is supplied from the outer peripheral side of the spiral to form the inner peripheral. It is possible to adopt a form in which the liquid is discharged from the side and the above is repeated thereafter. -The form in which the gas inlet is provided at a position facing at least a part of the spiral tube group can be adopted. The frequency at which the exhaust gas introduced from the gas inlet contacts the spiral tube group increases, and the exhaust gas having heat is easily cooled by a cooling medium such as a cooling liquid in the spiral tube. In the spiral tube group, the direction in which the cooling medium such as the cooling liquid flows is the spiral direction of the spiral tube, but is preferably the same direction among the circumferential directions in each spiral tube. That is, it is preferable that all the spiral tubes forming the group of spiral tubes flow clockwise, or that all the spiral tubes forming the group of spiral tubes flow counterclockwise. This is because the passage resistance of the cooling medium is reduced, and the cooling medium easily flows. The hollow chamber is divided into a spiral tube housing chamber having a gas inlet and accommodating a spiral tube group, and a gas expansion chamber having a gas outlet and expanding the exhaust gas discharged from the spiral tube housing. Can be adopted. In this case, it is possible to expect a noise reduction effect based on volume reduction by cooling the high-temperature and high-pressure exhaust gas and a noise reduction effect based on gas pressure reduction by expansion of the high-temperature and high-pressure exhaust gas. It can further contribute to reducing noise. The number of gas expansion chambers can be appropriately selected. It is possible to adopt a configuration in which the spiral tube housing is arranged on the upstream side in the direction in which the exhaust gas flows, and the gas expansion chamber is arranged on the downstream side in the direction in which the exhaust gas flows. -The box can adopt a form having a cooling chamber on the outer peripheral side of the hollow chamber of the box. The cooling chamber may be provided so as to make one round around the outer circumference of the box, or may be provided partially on the outer circumference of the box. The cooling chamber can cool the hollow chamber of the box, which can further contribute to cooling the exhaust gas in the box. -The box can adopt a form having a dispersion promoting member that promotes dispersion of a cooling medium such as a cooling liquid in the cooling chamber. This can reduce uneven flow of a cooling medium such as a cooling liquid in the cooling chamber. The dispersion promoting member can be formed by a plate, a projection, or the like. A configuration in which a common supply pipe for supplying a cooling medium such as a cooling liquid to both the spiral tube and the cooling chamber can be adopted. Further, a form in which a common discharge pipe for discharging a cooling medium such as a cooling liquid from both the spiral tube and the cooling chamber can be adopted.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be specifically described below with reference to FIGS.

The exhaust gas cooling apparatus according to the present embodiment has a function of silencing noise of exhaust gas discharged from a cogeneration system or a vehicle. The exhaust gas cooling device includes a box 1 having a cylindrical shape. The box 1 includes a gas inlet pipe 12 having a gas inlet 11 through which exhaust gas is introduced into the apparatus, a gas outlet pipe 14 having a gas outlet 13 through which exhaust gas is led out of the apparatus, and a gas inlet port. 11 and a cylindrical hollow chamber 16 communicating the gas outlet 13.

The gas introduction pipe 12 is connected to an exhaust gas generation source, and is held in a radially central region of a first end plate 17 attached to one end 1a of the box body 1. The gas outlet pipe 14 is held at a radial end of a second end plate 18 attached to the other end 1 c of the box 1. The first end plate 17 is provided with a common discharge pipe 21 connected to a drainage point so as to be located on a radial end side of the first end plate 17. The second end plate 18 is provided with a common feed pipe 20 that is connected to a water supply source that supplies cooling water so as to be located at a radial end side of the second end plate 18.

As shown in FIG. 1, a hollow chamber 16 of the box 1 is provided.
Is divided into a spiral tube accommodating chamber 24 having a gas inlet 11 and a gas expansion chamber 25 having a gas outlet 13 and for expanding exhaust gas discharged from the spiral tube accommodating chamber 24. The gas expansion chamber 25 is partitioned into a cylindrical first gas expansion chamber 25a, a cylindrical second gas expansion chamber 25b, and a cylindrical third gas expansion chamber 25c in order from the side close to the spiral tube housing chamber 24. . The first partition wall 27 partitions the spiral tube housing chamber 24 and the first gas expansion chamber 25a. The second partition wall 28 includes a first gas expansion chamber 25a and a second gas expansion chamber 25b.
And partition. The third partition wall 29 partitions the second gas expansion chamber 25b and the third gas expansion chamber 25c. Assuming that the chamber length of the first gas expansion chamber 25a is L1, the chamber length of the second gas expansion chamber 25b is L2, and the chamber length of the third gas expansion chamber 25c is L3, in this embodiment, as can be understood from FIG. L3> L
1> L2.

A first exhaust pipe 31 having a cylindrical shape is fixed to the first partition wall 27, the second partition wall 28, and the third partition wall 29. A cylindrical second exhaust pipe 32 and a similarly cylindrical third exhaust pipe 33 are fixed to the second partition wall 28 and the third partition wall 29. The first exhaust pipe 31, the second exhaust pipe 32, the third
The exhaust pipes 33 extend along the length of the box 1 and are arranged side by side in the radial direction of the box 1. As shown in FIG. 1, the second exhaust pipe 32 is
Are arranged on the central axis P in the radial direction. The first exhaust pipe 31 is arranged at a position separated from the center axis P in the radial direction of the box body 1 by D1. The third exhaust pipe 33 is arranged at a position D2 away from the center axis P of the box 1 in the radial direction.

A start end 31s of the first exhaust pipe 31 communicates with the spiral tube accommodating chamber 24 and an end 3s of the first exhaust pipe 31.
1f communicates with the third gas expansion chamber 25c, and the first exhaust pipe 31
The first small hole group 35 formed in the intermediate portion of the peripheral wall forming
Communicates with the second gas expansion chamber 25b. Second exhaust pipe 32
Is connected to the third gas expansion chamber 25c, and the end 32f of the second exhaust pipe 32 is connected to the first gas expansion chamber 2c.
5a, and a second small hole group 36 formed in an intermediate portion of the peripheral wall forming the second exhaust pipe 32 is provided with a second gas expansion chamber 25b.
Communicate with The start end 33s of the third exhaust pipe 33 communicates with the first gas expansion chamber 25a, and the end 33f of the third exhaust pipe 33 communicates with the gas outlet pipe 14. Third exhaust pipe 33
The third small hole group 34 is surrounded by a surrounding tube 38 via a sound absorbing material 37.

In this embodiment, as shown in FIG. 3, one metal cylindrical tube (material: iron-based such as carbon steel, alloy steel, stainless steel, aluminum alloy, titanium alloy, copper alloy) The spiral tube 5 is formed by spirally winding a non-ferrous material (e.g., non-ferrous material) in the same virtual plane. The cross section of the spiral tube 5 has a circular shape. A spiral gap 5k having a spiral shape is formed between the peripheral walls 5m of the spiral tube 5. The spiral tube 5 is wound in the same imaginary plane so as to extend from the central region Wa of the spiral toward the outer periphery. The inner opening 58 provided in the central region Wa of the spiral and the outer periphery W of the spiral are formed.
b, and a spiral passage 57 that spirally connects the outer opening 59 and the inner opening 58 to each other. As described above, since the spiral tube 5 is spirally bent, the cooling water passing through the spiral passage 57 inside the spiral tube 5 also flows spirally along the spiral passage 57, and flows through the straight tube. As compared with the case where the water flows, the frequency of contact between the inner wall surface of the spiral tube 5 and the cooling water increases, and the heat exchange function increases.

In this embodiment, as shown in FIG.
The spiral tubes 5 (5a, 5a, 5a,
b, 5c, 5d, and 5e) are arranged in series along the direction intersecting with the radial direction of the spiral, that is, along the length direction of the box 1, so that the spiral tube group 6 is arranged in parallel with the spiral tube. It is formed in the accommodation room 24. The cooling means according to the present embodiment for cooling the exhaust gas is formed by the spiral tube group 6 arranged in the spiral tube housing chamber 24. Such a spiral tube group 6 has an increased exposed area in contact with high-temperature exhaust gas, that is, an increased heat transfer area for heat exchange with high-temperature exhaust gas. Each of the spiral tubes 5 constituting the spiral tube group 6
Are almost concentrically arranged.

The upstream spiral tube 5 (5)
In a), the cooling water is supplied from the inner opening 58 of the spiral and discharged from the outer opening 59. The inner opening 58 of the spiral tube 5 (5a) is connected to one end 63m of the intermediate water supply pipe 63 in the hollow chamber 16, and the other end 63 of the intermediate water supply pipe 63.
n is connected to the common feed pipe 20. Therefore, the spiral tube 5
The inner opening 58 of (5a) is connected to the common feed pipe 20 via the intermediate feed pipe 63.

In the next spiral tube 5 (5b) adjacent to the downstream of the spiral tube 5 (5a), cooling water is supplied from the outer opening 59 of the spiral and discharged from the inner opening 58. In the spiral tube 5 (5c) adjacent to the downstream of the spiral tube 5 (5b), cooling water is supplied from the inner opening 58 of the spiral and discharged from the outer opening 59. In the next spiral tube 5 (5d) adjacent to the downstream of the spiral tube 5 (5c), cooling water is supplied from the outer opening 59 of the spiral and discharged from the inner opening 58. In the next spiral tube 5 (5e) adjacent to the downstream of the spiral tube 5 (5d), cooling water is supplied from the inner opening 58 of the spiral and discharged from the outer opening 59. The outer opening 59 of the spiral tube 5e is connected to the common discharge tube 21 of the first end plate 17. As described above, the spiral tube group 6 is alternately provided with a water flowing form flowing from the inner circumferential side of the spiral to the outer circumferential side and a water flowing form flowing from the outer circumferential side of the spiral to the inner circumferential side. The direction in which the water flows in the spiral tube group 6 is the spiral direction of the spiral tube 5, but the same direction in the circumferential direction of each spiral tube 5.

In this embodiment, an L-shaped fixture 7 is used to fix the above-mentioned spiral tube 5 in the spiral tube housing chamber 24 of the box 1. As shown in FIG. 2, the fixture 7 has a holding arm 70 extending along the radial direction of the spiral tube 5 and a bent piece 72 provided on the outer end side of the holding arm 70. As shown in FIG. 1, while holding the spiral tube 5 with the holding arms 70 of the pair of fixtures 7, the bent pieces 72
Is fixed to the inner peripheral surface of the box 1 by fasteners, welding, or the like, so that the spiral tube 5 is fixed.
Are fixed in the spiral tube accommodating chamber 24. The material of the fixture 7 is formed of a metal such as carbon steel, alloy steel, or aluminum alloy in consideration of heat conductivity, strength, and price. FIG.
As shown in the figure, the spiral tube 5 (5a, 5b, 5c, 5d, 5
e), the spiral gaps 5k between the adjacent spiral tubes 5 (5a, 5b, 5c, 5d, 5e) face each other in a state where the spiral tubes 5 (5a, 5b, 5c, 5d, 5e) are arranged in series. The spiral passages 57 face each other to ensure the passage of exhaust gas.

Since the fixture 7 has an L-shape, the fixture 7
The contact area between the coil and the spiral tube 5 is small. Thereby, the exposed area of the spiral tube 5 in the spiral tube housing chamber 24 can be increased. As a result, a large contact area between the exhaust gas introduced into the spiral tube housing chamber 24 and the spiral tube 5 can be ensured, which contributes to promoting cooling of the exhaust gas by the spiral tube 5. As shown in FIG. 2, the fixtures 7 are arranged radially. The inner end 7i side of the fixture 7 is not fixed to the box 1. In FIG. 1, a part of the fixture 7 is indicated by a virtual line for drawing.

In this embodiment, the outer peripheral wall of the box 1 is 2
It has a heavy structure. That is, on the outer peripheral side of the hollow chamber 16 of the box 1, a cooling chamber 60 is formed so as to surround the hollow chamber 16 so as to make one round in the circumferential direction. The cooling chamber 60 is the hollow chamber 16
Are provided over substantially the entire length in the axial direction of the shaft. As shown in FIG. 1, the chamber portion 60 x of the cooling chamber 60 located on the second end plate 18 side communicates with the common feed pipe 20 via the branch pipe 75 and the intermediate water pipe 63. A chamber portion 60y of the cooling chamber 60 located on the first end plate 17 side is provided with a merging pipe 78.
Through the common discharge pipe 21. In the cooling chamber 60, a dispersion promoting member 8 that promotes dispersion of the cooling water in the cooling chamber 60 is provided at an intermediate position in the longitudinal direction of the box 1. The dispersion promoting member 8 is for suppressing the cooling water flowing in the cooling chamber 60 from arriving at the common discharge pipe 21 directly as a drift. The dispersion promoting member 8 is formed of a plate member having a semi-ring shape coaxial with the central axis P of the box 1, and can function as a baffle plate for water passage in the cooling chamber 60. When the cooling water in the cooling chamber 60 hits the dispersion promoting member 8 functioning as a baffle, the dispersibility of the cooling water in the cooling chamber 60 increases, and the cooling chamber 60
The occurrence of unevenness in the flow path of the cooling water in the cooling chamber 6 is suppressed.
0 ensures the cooling effect.

Now, a case where the exhaust gas cooling device according to the present embodiment is used will be described. First, the water supply source and the common supply pipe 20 are connected to supply cooling water from the water supply source in the direction of arrow W. The supplied cooling water is supplied to a group of spiral tubes 6 serving as a cooling means through an intermediate water supply pipe 63, and a branch pipe 7.
5 diverges into the cooling chamber 60. Thus, the cooling water flows to both the spiral tube group 6 and the cooling chamber 60. Spiral tube group 6
Is supplied to the spiral tube 5 (5) on the upstream side of the cooling water.
a, 5b, 5c, 5d, 5e), and is discharged from the common discharge pipe 21 to the outside of the apparatus. The cooling water that has flowed through the cooling chamber 60 joins the cooling water that has flowed through the spiral tube group 6 through a merging pipe 78 and is discharged from the common discharge pipe 21 to the outside of the apparatus.

With the cooling water being supplied as described above, the high-temperature and high-pressure exhaust gas discharged from the exhaust gas generation source is supplied through the gas inlet 11 of the gas inlet pipe 12 to the box 1.
Is introduced into the hollow chamber 16 from the direction of the arrow M. This exhaust gas flows through the spiral tube accommodating chamber 24 of the hollow chamber 16. At this time, the high-temperature and high-pressure exhaust gas is first supplied to the spiral tubes 5 (5e, 5d, 5c, 5b,
5a), it is cooled by the water-cooled spiral tube group 6. As a result, the gas volume of the exhaust gas supplied into the spiral tube accommodating chamber 24 decreases, and the pressure of the exhaust gas decreases. Therefore, the effect of reducing the noise of the exhaust gas can be secured.

Further, the exhaust gas cooled by the spiral tube group 6 flows from the starting end 31s of the first exhaust pipe 31 to the first exhaust pipe 31.
Then, the gas flows from the terminal end 31f of the first exhaust pipe 31 to the third gas expansion chamber 25c, and expands in the third gas expansion chamber 25c. At this time, the exhaust gas is supplied to the first small hole group 3 of the first exhaust pipe 31.
5 flows into the second gas expansion chamber 25b and expands. Further, as described above, the exhaust gas that has reached the third gas expansion chamber 25c flows from the start end 32s of the second exhaust pipe 32 to the second exhaust pipe 32c.
Flows from the terminal end portion 32f of the second exhaust pipe 32 to the first gas expansion chamber 25a, and expands in the first gas expansion chamber 25a.
At this time, the exhaust gas flowing from the second small hole group 36 of the second exhaust pipe 32 to the second gas expansion chamber 25b expands. Further, the exhaust gas that has reached the first gas expansion chamber 25 a is supplied to the third exhaust pipe 3.
3 flows through the third exhaust pipe 33 from the start end 33s, flows from the end 33f of the third exhaust pipe 33 through the gas outlet 13 of the gas outlet pipe 14, and out of the apparatus. Since the expansion of the exhaust gas is repeated in this manner, the speed of the exhaust gas gradually decreases,
The effect of reducing noise of exhaust gas can be secured.

In addition, in this embodiment, since both the spiral tube housing chamber 24 and the gas expansion chamber 25 are cooled by the cooling chamber 60 arranged on the outer peripheral side of the box 1, the gas volume of the exhaust gas is reduced. It is possible to further contribute to the reduction of the exhaust gas, and it is possible to secure the effect of reducing the noise of the exhaust gas.

As described above, in this embodiment,
The high-temperature and high-pressure exhaust gas passes through the spiral tube accommodating chamber 24 and forms the spiral tube group 6 in the spiral tube accommodating chamber 24.
e, 5d, 5c, 5b, 5a) and is cooled.
Thereby, the gas volume of the exhaust gas introduced into the spiral tube housing chamber 24 decreases, and the pressure of the exhaust gas decreases. For this reason, the noise of the exhaust gas led out of the device from the gas outlet 13 can be reduced.

In this embodiment, since the exhaust gas silencing effect can be obtained by the gas expansion function using the first gas expansion chamber 25a to the third gas expansion chamber 25c, the gas is led out of the apparatus through the gas outlet 13. The effect of reducing the noise of the exhaust gas to be produced can be further ensured.

Further, a cooling chamber 60 formed on the outer peripheral side of the box 1
Also, the spiral tube accommodating chamber 24 and the gas expansion chamber 25 are cooled, so that the gas volume of the exhaust gas can be further reduced, and the effect of reducing the noise of the exhaust gas can be further ensured.

Further, as described above, the cooling means according to the present embodiment includes the spiral tube 5 (5a, 5b, 5c, 5d, 5e) spirally wound in the same imaginary plane and through which the cooling water flows. Is arranged in series along the length direction of the spiral tube group, so that the increase in the axial length of the spiral tube group 6 is suppressed, that is, while the increase in the length of the box 1 is suppressed, The contact area with the spiral tube 5 (5a, 5b, 5c, 5d, 5e) can be increased. Therefore, as compared with the prior art shown in FIG. 4, it is possible to increase the cooling capacity for cooling the exhaust gas and, consequently, the silencing ability for silencing the exhaust gas while suppressing an increase in the length of the box 1.

Further, in this embodiment, the gas inlet 11
Is provided at a position facing the spiral tube group 6, the exhaust gas introduced from the gas inlet 11 comes into effective contact with the spiral tube group 6, and a cooling capacity for cooling the exhaust gas is secured. it can. Moreover, since the spiral tube 5 has the spiral spiral gap 5 k along the spiral passage 57, it is possible to contribute to reducing the passage resistance when the exhaust gas flows through the spiral tube group 6. In particular, in this embodiment, since the total projected area of the spiral gap 5k in one spiral tube 5 is set to be larger than the opening area of the gas introduction port 11, that is, the cross-sectional area of the flow path, the reduction of the exhaust gas passage resistance is reduced. Can also contribute.

Further, in this embodiment, the bent piece 72 of the fixing tool 7 is attached to the box 1 while the spiral tube 5 (5a, 5b, 5c, 5d, 5e) is held by the holding arm 70 of the fixing tool 7. Since it is fixed to the inner peripheral surface, the fixing strength of the spiral tube 5 is ensured.
For this reason, even if pulsating pressure is generated in the exhaust gas supplied to the hollow chamber 16, the spiral tube 5 (5a, 5a,
5b, 5c, 5d, and 5e) can be suppressed. Further, as shown in FIG. 1, the inner openings 5 of the spiral tubes 5 adjacent to each other are formed.
8 are integrally connected to each other, and the outer openings 59 of the spiral tubes 5 adjacent to each other are also integrally connected to each other, so that the integrity of the spiral tube group 6 formed by the plurality of spiral tubes 5 is improved. As a result, even if pulsating pressure is generated in the exhaust gas supplied to the hollow chamber 16, swinging of the spiral tube 5 can be suppressed.

In addition, in the present embodiment, the flow direction of the exhaust gas is basically the direction from the gas inlet 11 which is the upstream end of the exhaust gas to the gas outlet 13 which is the downstream end of the exhaust gas. is there. On the other hand, the flow direction of the cooling water is basically the same as the common feed pipe 20 at the upstream end of the cooling water.
From the common discharge pipe 21 which is the downstream end of the cooling water. Thus, the flow direction of the exhaust gas and the flow direction of the cooling water are opposite to each other. Therefore, the frequency of heat exchange between the high-temperature exhaust gas and the cooling water increases, and the high-temperature exhaust gas can be effectively cooled by the cooling water.

In the above embodiment, the spiral tube 5 (5
e, 5d, 5c, 5b, and 5a) have the same diameter, but are not limited to this, and some diameters may be different. In addition, the present invention is not limited to the embodiment described above and shown in the drawings, but can be implemented with appropriate modifications as needed. The embodiments according to the above description are exemplifications of the present invention, and even if some of the phrases described in the embodiments can be described in each claim.

(Supplementary Note) The following technical idea can be understood from the above description. In each claim, the spiral tube has an inner opening on the inner peripheral side and an outer opening on the outer peripheral side, and the inner openings of the spiral tubes adjacent to each other are connected to each other, and the outer sides of the spiral tubes adjacent to each other An exhaust gas cooling device, wherein the openings are connected to each other. In each of the claims, the exhaust gas cooling device is characterized in that the spiral tubes constituting the spiral tube group are adjacently connected to each other. -The exhaust gas cooling device according to each claim, wherein the spiral tubes constituting the spiral tube group are connected in a concentric arrangement. In each of the claims, the exhaust gas cooling device is characterized in that the total projected area of the spiral gap in one spiral tube is set larger than the opening area of the gas inlet. An exhaust gas cooling device according to any one of claims, wherein the spiral gaps between the adjacent spiral tubes face each other to ensure the passage of exhaust gas. -In each claim, the spiral tube group has a water flow form flowing from the inner circumferential side to the outer circumferential side of the spiral, and a water flowing form flowing from the outer circumferential side to the inner circumferential side of the spiral. Exhaust gas cooling device characterized. In each claim, the spiral tube group alternately includes a water flowing form flowing from the inner circumferential side to the outer circumferential side of the spiral and a water flowing form flowing from the outer circumferential side to the inner circumferential side of the spiral. An exhaust gas cooling device, characterized in that: In each of the claims, the cooling medium flowing through the spiral tube group flows in the same winding direction.

[0034]

According to the exhaust gas cooling apparatus of the present invention, the cooling means moves the spiral tube spirally wound in the same virtual plane, through which the cooling medium flows, along the direction intersecting the radial direction of the spiral. Surface area of the spiral tube having the ability to cool exhaust gas while miniaturizing the size of the box because it is formed by a group of spiral tubes arranged side by side in series. The area can be increased. Therefore, the cooling area of the spiral tube group for cooling the high-temperature exhaust gas can be secured.
Therefore, the high-temperature exhaust gas can be effectively cooled to reduce the gas flow rate, which contributes to reducing the exhaust gas noise.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an exhaust gas cooling device according to an embodiment.

FIG. 2 is a cross-sectional view taken along the line II-II of FIG. 1 according to the embodiment.

FIG. 3 is a front view of a spiral tube used in the exhaust gas cooling device according to the embodiment.

FIG. 4 is a cross-sectional view according to the related art.

[Explanation of symbols]

In the figure, 1 is a box, 11 is a gas inlet, 13 is a gas outlet, 16 is a hollow chamber, 20 is a common feed pipe, 21 is a common discharge pipe, 24 is a spiral tube housing chamber, and 25 is a gas expansion chamber. , 7 are fixtures, 5 (5a to 5e) is a spiral tube, 6 is a group of spiral tubes (cooling means), 60 is a cooling chamber, and 8 is a dispersion promoting member.

Continuing on the front page (72) Inventor Hisashi Miwa 1st Takao Shinmachi Tenno, Toyota City, Aichi Prefecture Aisin Takaoka Co., Ltd. (72) Inventor Hiroyuki Watanabe 1st Takaoka Shinmachi Tenno, Toyota City, Aichi Prefecture Aisin Takaoka Inc. F-term (Reference) 3D038 BA01 BA06 BB01 BC00 3G004 AA01 BA01 CA00 CA04 DA07 DA08 DA09 DA21 EA06 FA04 3G091 AA02 BA36 BA38

Claims (4)

[Claims] 1. A box body having a gas inlet through which exhaust gas is introduced, a gas outlet through which exhaust gas is led out, and a hollow chamber communicating the two, and a hollow body disposed in the hollow chamber of the box body. A cooling means for cooling the exhaust gas introduced into the chamber, the cooling means comprising: a spiral tube spirally wound in the same virtual plane, through which a cooling medium flows; An exhaust gas cooling device comprising a plurality of spiral tube groups which are arranged in parallel in series along a direction intersecting with the spiral tube. 2. The exhaust gas cooling device according to claim 1, wherein the gas inlet is provided at a position facing at least a part of the spiral tube group. 3. The swirl tube housing according to claim 1, wherein the hollow chamber has the gas inlet and houses the swirl tube group, and has the gas outlet and the swirl tube housing. An exhaust gas cooling device, which is partitioned into a gas expansion chamber for expanding exhaust gas discharged from the chamber. 4. An exhaust gas cooling apparatus according to claim 1, wherein said box has a cooling chamber surrounding an outer peripheral side of said hollow chamber of said box.