JP5767927B2 - Heat exchanger - Google Patents

Description

  The present invention relates to a heat exchanger that warms water with the heat of exhaust gas.

  In recent years, various cogeneration apparatuses have been proposed (see, for example, Patent Document 1 (FIGS. 1 and 3)).

  FIG. 1 of the patent document shows a cogeneration apparatus (10) (the numbers in parentheses indicate the symbols described in Patent Document 1. The same applies hereinafter). The generator (27) is operated by the engine (12) to obtain electric energy. Exhaust gas generated in the engine (12) is sent to the heat exchanger (14). Water is heated by the heat of the exhaust gas sent to the heat exchanger (14). The heat exchanger (14) is an important device for increasing the thermal efficiency. Details of the heat exchanger (14) will be described with reference to the next figure.

Patent document 1 is demonstrated based on the following figure.
As shown in FIG. 11, the heat exchanger 100 includes a base body 102 to which an exhaust gas introduction pipe 101 is connected, a catalyst carrier 103 that is supported by the base body 102 and purifies exhaust gas, and surrounds the catalyst carrier 103 and on the outer periphery. A cylindrical body 105 formed with a projecting portion 104 that spirally protrudes, a first case 106 in which exhaust gas flows between the cylindrical body 105 and the cylindrical body 105, and the first case 106 A second case 108 for supporting a plurality of exhaust gas pipes 107 and 107 and allowing water to flow around the exhaust gas pipes 107 and 107, and an exhaust gas exhaust pipe connected to the second case 108, respectively. 111, a water introduction pipe 112, and a water discharge pipe 113.

  The exhaust gas introduced from the exhaust gas introduction pipe 101 is purified by the catalyst carrier 103. The purified exhaust gas flows between the cylinder 105 and the first case 106 toward the upper side of the drawing. The exhaust gas flowing between the cylindrical body 105 and the first case 106 is guided by the projecting portion 104 formed in a spiral shape and flows in a spiral shape. Exhaust gas that flows between the cylindrical body 105 and the first case 106 and reaches the lower surface of the base 102 flows through the exhaust gas pipes 107 and 107 downward in the drawing. The exhaust gas that has passed through the exhaust gas pipes 107 and 107 is exhausted from the exhaust gas exhaust pipe 111.

On the other hand, the water introduced from the water introduction pipe 112 flows through the second case 108 toward the top of the drawing. Similarly to the exhaust gas, water flows spirally in the second case 108.
The water flowing in the second case 108 is warmed by the exhaust gas through the first case 106 and the exhaust gas pipes 107 and 107. The warmed water is discharged from the water discharge pipe 113.

  By the way, according to the heat exchanger 100, there is a substantially triangular space 116 in a sectional view surrounded by the lower surface of the base 102, the upper end of the cylindrical body 105, and the catalyst support member 115 that supports the catalyst carrier 103. This space 116 is a dead space in which exhaust gas and water do not flow and does not contribute to heat exchange. The presence of the dead space increases the size of the heat exchanger 100.

  While it is desired to reduce the size of the cogeneration apparatus, the heat exchanger that is a component thereof is also required to be further reduced in size.

JP 2011-21562 A

  This invention makes it a subject to provide the small heat exchanger suitable for a cogeneration apparatus.

The invention according to claim 1 includes a base to which an exhaust gas inlet for introducing exhaust gas is connected, a catalyst case supported by the base and holding a catalyst carrier, and surrounding the catalyst case and the catalyst case. In a heat exchanger consisting of a first cylinder that flows exhaust gas that has passed through the catalyst carrier in between, and a second cylinder that surrounds the first cylinder and allows water to flow between the first cylinder, The base includes a first member connected to the exhaust gas introduction port and to which the catalyst case is attached, and a second member joined to the first member on the downstream side of the first member. A hollow body that also serves as a passage for the exhaust gas, and the second member extends from the end of the first cylinder on the exhaust gas inlet side toward the second cylinder, Raised from the bottom edge toward the first member And the wall portion, made of, with which an exhaust gas discharge port for discharging the exhaust gas purified by the catalyst support, characterized in that it closes the end of the second cylindrical body.

In the invention according to claim 2, wherein the bottom is characterized in that it is formed integrally with the end portion of the exhaust gas inlet side of the first cylindrical body.

In the invention according to claim 3, there is provided a base body to which an exhaust gas inlet for introducing exhaust gas is connected, a catalyst case supported by the base body and holding a catalyst carrier, and surrounding the catalyst case and the catalyst case. In a heat exchanger consisting of a first cylinder that flows exhaust gas that has passed through the catalyst carrier in between, and a second cylinder that surrounds the first cylinder and allows water to flow between the first cylinder,
The base includes a first member connected to the exhaust gas introduction port and to which the catalyst case is attached, and a second member joined to the first member on the downstream side of the first member. A hollow body that also serves as a passage for the exhaust gas, the second member is formed integrally from an end of the second cylinder, and the first cylinder is formed of the first cylinder. wherein at the end of the exhaust gas inlet side, the flange portion extending toward the second cylindrical body is formed, with which the flange portion is supported by bonding to the inner peripheral surface of the second tubular member, wherein It has an exhaust gas exhaust port for exhausting exhaust gas purified by the catalyst carrier.
In the invention which concerns on Claim 4, the said collar part is extended toward the said water discharge port formed in the said 2nd cylinder.
In the invention which concerns on Claim 5, the said 1st cylinder is shifted to the said water discharge port side on the basis of the center axis | shaft of the said catalyst carrier, The said exhaust gas discharge port is with respect to the said water discharge port, The catalyst carrier is provided at a distance of 180 ° with respect to the central axis of the catalyst carrier.

  In the invention according to claim 1, the base body is a hollow body including a first member and a second member joined to the first member, and also serving as an exhaust gas passage. A base for supporting the catalyst carrier and the cylinder is also used as an exhaust gas passage. It is not necessary to provide a separate exhaust gas passage around the periphery of the substrate, and the heat exchanger can be downsized.

  In the invention which concerns on Claim 2, a 2nd member is integrally formed from the edge part of a 1st cylinder. By integrally forming the second member and the first cylindrical body, the number of parts can be reduced and the number of assembling steps can be reduced.

In the invention which concerns on Claim 3, a 2nd member is integrally formed from the edge part of a 2nd cylinder. By integrally forming the second member and the second cylindrical body, the number of parts can be reduced and the number of assembly steps can be reduced.
In the invention which concerns on Claim 4, even if it is a case where water boils by extending a collar part toward a water discharge port, it can prevent that a bubble accumulates on the lower surface of a collar part. Air bubbles can be prevented from accumulating and water can flow smoothly.
In the invention which concerns on Claim 5, a 1st cylinder is shifted to the water discharge port side with respect to a catalyst support | carrier and a 2nd cylinder. By shifting to the water discharge port side, the flow channel area of the water on the water discharge port side is narrowed, and the flow channel area of the part away from the water discharge port is widened. By reducing the area of the channel that passes through the shortest distance from the water inlet to the water outlet, the flow rate of water that passes through the shortest distance is reduced. On the other hand, the flow area of the part far from the water discharge port and difficult to flow of water is widened to increase the flow rate of water. Thereby, water can be made to flow more uniformly over the entire circumference between the first cylinder and the second cylinder. By flowing water more uniformly, water can flow smoothly and the efficiency of heat exchange can be improved.
Furthermore, by providing the exhaust gas discharge port with the central axis of the catalyst carrier sandwiched between the water discharge port, the following effects can be obtained.
The first cylinder is displaced toward the water discharge port with reference to the central axis of the catalyst carrier. That is, the first cylinder is shifted away from the exhaust gas discharge port. By shifting, the flow area of the exhaust gas formed between the catalyst case and the first cylinder is narrow on the exhaust gas discharge port side and wide on the part (left side of the drawing) away from the exhaust gas discharge port. Can do. By reducing the area of the flow path that passes through the shortest distance to the exhaust gas discharge port, the flow rate of the exhaust gas that passes through the shortest distance is reduced. On the other hand, the flow area of the part far from the exhaust gas discharge port and difficult to flow the exhaust gas is expanded, and the flow rate of the exhaust gas is increased. Thereby, exhaust gas can be flowed more uniformly over the perimeter between a catalyst case and a 1st cylinder. By flowing the exhaust gas more uniformly, the exhaust gas can flow smoothly and the efficiency of heat exchange can be increased.

1 is a cross-sectional view of a heat exchanger according to Embodiment 1. FIG. It is a perspective view of the heat exchanger which concerns on this invention. It is a disassembled perspective view of a base | substrate and a 1st case. It is an expanded view of a 1st cylinder. FIG. 5 is a sectional view taken along line 5-5 of FIG. It is a figure explaining after exhaust gas is introduced until it passes a catalyst carrier. It is a figure explaining the flow of the purified exhaust gas, and the flow of water. It is sectional drawing of the heat exchanger which concerns on Example 2. FIG. It is sectional drawing of the heat exchanger which concerns on Example 3. FIG. FIG. 6 is a cross-sectional view of an exhaust gas passage and a water passage according to a fourth embodiment. It is a figure explaining the basic composition of the conventional technology.

  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.

First, Embodiment 1 of the present invention will be described with reference to the drawings.
As shown in FIG. 1, a heat exchanger 10 includes a cylindrical catalyst carrier 11 that purifies exhaust gas, a catalyst case 12 that surrounds and holds the catalyst carrier 11, and a base body on which the catalyst case 12 is supported. 13, a first case 15 that is supported by the base body 13 and surrounds the catalyst case 12, a second case 16 that surrounds the first case 15 and is supported by the base body 13, and the second case 16 A water introduction pipe 17 joined to the side surface in the vicinity of the lower end part to introduce water into the second case 16, and a water discharge pipe 18 joined to the second case 16 above the water introduction pipe 17 to discharge water The exhaust gas exhaust pipe 21 is connected to the lower surface of the base 13 and exhausts exhaust gas that has passed through the base 13. A flange 22 for fastening to another member is joined to the upper end of the base 13.

  The base 13 includes a first member 24 to which the catalyst case 12 is bonded to the lower surface, and a second member 25 to be bonded to the first member 24. The base 13 is formed in a hollow shape by superimposing the first member 24 and the second member 25.

  The first case 15 joined to the second member 25 includes a cylindrical first cylinder 27 surrounding the catalyst case 12 and a lower end of the catalyst carrier 11 joined to the lower end of the first cylinder 27. And a first bottom portion 28 covering the same. The first case 15 can be manufactured by welding the first tubular body 27 and the first bottom portion 28 which are formed by press molding.

  The second case 16 includes a substantially cylindrical second cylinder 31 that surrounds the first cylinder 27, and a second bottom 32 that is joined to the lower end of the second cylinder 31 and covers the first bottom 28. .

  The first member 24 includes a bottom 34 and a wall 35 extending from the periphery of the bottom 34 toward the second member 25. From the opening formed in the bottom 34, the diameter is reduced toward the exhaust gas introduction side (the upper side in the drawing), and a tapered portion 36 formed in a taper shape in cross section is formed. An exhaust gas introduction port 37 into which the exhaust gas is introduced and the flange 22 is attached is formed at the tip of the taper portion 36. The tapered portion 36 and the exhaust gas inlet 37 are formed integrally with the first member 24.

  That is, the exhaust gas introduction port 37 for introducing the exhaust gas, and the tapered portion 36 that continuously expands from the downstream side of the exhaust gas introduction port 37 and smoothly flows the exhaust gas toward the catalyst carrier 11 are provided on the base body. 13 is formed integrally. By forming integrally, the number of parts of the heat exchanger 10 can be reduced.

  The second member 25 includes a bottom 41, a wall portion 42 that rises from the periphery of the bottom 41 toward the first member 24, and an exhaust gas discharge port 43 that discharges exhaust gas that has passed through the base body 13. Consists of. The exhaust gas discharge pipe 21 is joined to the exhaust gas discharge port 43.

  The first member and the second member may employ a structure in which both the bottom part and the wall part are overlapped, and a structure in which the bottom part and the wall part are superimposed on a member having only the bottom part. That is, any shape can be adopted as long as it is hollow. In addition, it is possible to change the shape as appropriate for easy welding, such as welding after extending the wall portions in the outer peripheral direction, or to butt weld each other with the wall portions it can.

An exhaust gas restricting portion 27 a that protrudes from the first cylindrical body 27 toward the catalyst case 12 and restricts the flow path of the exhaust gas when the tip contacts the catalyst case 12 is formed. That is, the exhaust gas flows in a meandering manner so as to avoid the portion where the exhaust gas restricting portion 27a is formed. Details will be described later.
A bulging portion 28 a that bulges toward the catalyst carrier 11 is formed substantially at the center of the first bottom portion 28.

  The second cylindrical body 31 has a general part 31a to which the water introduction pipe 17 is connected and a lower end closed by the second bottom part 32, and a diameter-expanding part to which the diameter of the general cylindrical part 31a is expanded and the water discharge pipe 18 is joined. 31b. A water inlet 31c to which the water inlet pipe 17 is joined is formed in the general part 31a, and a water outlet 31d to which the water outlet pipe 18 is joined is formed in the enlarged diameter part 31b.

The central axis 46 of the general portion 31a of the second cylindrical body 31 is shifted with respect to the central axis 45 of the catalyst carrier 11 in a direction away from the water discharge port 31d.
On the other hand, with respect to the central axis 45 of the catalyst carrier 11, the central axes of the exhaust gas inlet 37, the tapered portion 36, and the first cylinder 27 coincide. The reason will be described later.
Details of the first member 24 and the second member 25 will be described with reference to the following drawings.

  As shown in FIG. 2, the bottom 34 of the first member 24 includes a general part 34 a formed in a substantially circular shape along the upper part of the second cylindrical body 31, and an exhaust gas discharge port ( 1 and an extending portion 34b that covers the reference numeral 43).

The same applies to the bottom 41 of the second member 25. That is, the second cylinder 31 is covered with the general portion 41a, and the exhaust portion 41b extending from the general portion 41a is provided with the exhaust gas discharge port and the exhaust gas discharge pipe 21 is joined. The extension part 41b may be provided as much as necessary to form the exhaust gas discharge port, and the second member 25 can be made compact compared to the case where the second member 25 is elliptical.
Details of the first cylinder (FIG. 1, reference numeral 27) will be described with reference to the next drawing.

  As shown in FIG. 3, a plurality of exhaust gas restricting portions 27 a are formed in the first cylinder 27. By being formed in a part of the cylindrical first cylindrical body 27, the exhaust gas restricting portion 27a has a substantially C shape in plan view. These exhaust gas restricting portions 27a are formed in the same shape, and are formed at two places at the same height in the height direction. When two exhaust gas restricting portions 27a formed at the same height are set to one stage, such exhaust gas restricting portions 27a are formed in seven stages.

  Although the number of stages of the exhaust gas restricting portion 27a is arbitrary, it is desirable that the exhaust gas restricting portion 27a be arranged as described in the next figure. The first cylinder 27 will be described in more detail with reference to the next drawing.

  FIG. 4 is a view of the first cylindrical body 27 developed and viewed from the inside, and the exhaust gas restricting portion 27a protrudes toward the front side of the drawing. The lengths of the inter-regulator passages 27b formed between the exhaust gas restricting portions 27a and 27a in the same stage (horizontal direction in the drawing) through which the exhaust gas passes are all α.

  A midpoint between the restricting portion passages 27b and 27b formed in the same step is defined as C1. The length P between the two middle points C1 is equal to the length of the half circumference of the first cylinder 27. That is, the midpoint C1 of the inter-regulator passage 27b and the midpoint C1 of the inter-regulator passage 27b are formed 180 degrees apart. The exhaust gas restricting portions 27a formed 180 degrees apart are formed symmetrically with respect to the central axis (FIG. 1, reference numeral 45) of the first cylindrical body 27.

  The midpoint C1 of the inter-regulator passage 27b coincides in the height direction with the midpoint C2 of the exhaust gas restrictor 27a in the adjacent step (the vertical direction in the drawing). That is, they are arranged 90 degrees out of phase with respect to the exhaust gas restricting portions 27a in the adjacent stages.

  The length β of the exhaust gas restricting portion 27a, the length (1/2) α from one end of the exhaust gas restricting portion 27a to the midpoint C1 of the passage 27b between the restricting portions, and between the other end of the exhaust gas restricting portion 27a and the restricting portion When the length (1/2) α to the midpoint C1 of the passage 27b is set, the length obtained by adding these is β + (1/2) α · 2 = P is one pitch. In this case, one pitch is 180 °, and it can be said that the exhaust gas restricting portion 27a is arranged 90 ° out of phase with the exhaust gas restricting portion 27a of the adjacent stage.

One pitch is 120 °, and the phase is shifted by 60 ° with respect to the adjacent exhaust gas restricting portion. One pitch is 90 °, and the phase can be shifted by 45 ° with respect to the adjacent exhaust gas restricting portion.
Details of the exhaust gas passage through which the exhaust gas passes and the water passage through which water passes will be described with reference to the following drawings.

As shown in FIG. 5, the central axes of the catalyst case 12 and the first cylinder 27 coincide with the central axis 45 of the catalyst carrier 11. That is, it can be said that the central axis 45 of the catalyst carrier 11 is the central axis 45 of the first cylinder 27.
The central axis 45 of the first cylindrical body 27 is shifted to the water discharge pipe 18 (water discharge port) side by σ1 with respect to the central axis 46 of the general portion 31a of the second cylindrical body 31.
That is, as viewed relatively, the central axis 45 of the first cylinder 27 is disposed closer to the water discharge port side than the central axis 46 of the second cylinder 31.

  The exhaust gas flows in the catalyst carrier 11 from the front to the back of the drawing, and the purified exhaust gas passes through the exhaust gas passage between the catalyst case 12 and the first cylinder 27 from the back to the front of the drawing. To do.

Water flows in the water passage between the first cylinder 27 and the second cylinder 31 from the back of the drawing toward the front. By arranging the central axis 45 of the first cylinder 27 close to the water discharge pipe 18 (water discharge port) side, the water passage formed between the first cylinder 27 and the second cylinder 31 is It is narrow (σ2) on the side of the water discharge pipe 18 and widely formed at a site away from the water discharge pipe 18 (σ3). That is, the flow path area is narrow in the vicinity of the water discharge port, and the flow path area is wide at a site away from the water discharge port. The reason why it is formed in this way will be described later.
The operation of the heat exchanger 10 will be described in the following figures.

  As shown by the arrow (1) in FIG. 6, the exhaust gas introduced from the exhaust gas introduction port 37 flows toward the catalyst carrier 11. The exhaust gas passes through the catalyst carrier 11 and is purified as indicated by the arrow (2). The purified exhaust gas flows from the lower end of the catalyst carrier 11 to between the catalyst case 12 and the first cylinder 27 as indicated by an arrow (3).

By forming the bulging portion 28 a on the first bottom portion 28, the exhaust gas can flow smoothly between the catalyst case 12 and the first cylindrical body 27. That is, the bulging portion 28a serves as a guide for guiding the flow of exhaust gas.
The operation after coming out of the catalyst carrier 11 will be described with reference to the next figure.

  As shown in FIG. 7, the exhaust gas flows upward while meandering so as to avoid the exhaust gas restricting portion 27a. Exhaust gas that meanders and exits from the upper end of the first cylinder 27 passes through the inside of the base 13 and is discharged to the outside through the exhaust gas discharge port 43 and the exhaust gas discharge pipe 21.

  As indicated by the white arrow (5), the water introduced from the water introduction pipe 17 and the water introduction port 31c is directed toward the water discharge port 31d as indicated by the white arrow (6). It passes through the shortest path to the discharge port 31d. The remainder of the introduced water flows around the outer periphery of the first cylinder 27 and flows upward in a portion away from the water discharge port 31d, as indicated by a white arrow (7). The water that flows upward flows outward from the water discharge port 31d and the water discharge pipe 18 as indicated by the white arrow (8). The heat of the exhaust gas is transmitted to the water through the first cylinder 27. That is, the water is warmed.

  The base 13 is a hollow body that also includes a first member 24 and a second member 25 joined to the first member 24 and also serves as an exhaust gas passage. The base 13 for supporting the catalyst carrier 11 and the cylinders 27 and 31 is also used as an exhaust gas passage. It is not necessary to provide a separate exhaust gas passage around the periphery of the base 13, and the heat exchanger 10 can be downsized.

  In addition, a bulging portion 28 a is formed on the first bottom portion 28. By forming the bulging part 28a, it can be made to flow by a jet and the flow path area of water can be taken large. By increasing the water flow path area, the flow rate of water can be increased. A large flow rate of water prevents a rapid rise in water temperature and prevents water from boiling. By preventing the water from boiling, water can flow smoothly and heat can be exchanged efficiently.

Furthermore, the flow channel area on the water discharge port 31d side was narrowed, and the flow channel area at a part away from the water discharge port 31d was widened (see also FIG. 5). By reducing the area of the flow path that passes through the shortest distance from the water inlet 31c to the water outlet 31d, the flow rate of water that passes through the shortest distance is reduced. On the other hand, the flow path area of the part far from the water discharge port 31d and difficult to flow of water is expanded, and the flow rate of water is increased. Thereby, water can be flowed more uniformly over the entire circumference between the first cylinder 27 and the second cylinder 31. By flowing water more uniformly, water can flow smoothly and the efficiency of heat exchange can be improved.
Another embodiment of the present invention will be described in the following figures.

Next, a second embodiment of the present invention will be described with reference to the drawings.
FIG. 8 shows a cross-sectional configuration of the heat exchanger according to the second embodiment, corresponding to FIG.
As shown in FIG. 8, in the heat exchanger 50, the second member 52 constituting the base body 51 is integrally formed from the upper end of the first cylindrical body 53. The second member 52 and the first cylinder 53 are integrally formed by press molding, and the exhaust gas restricting portion 27a is formed by press molding. The second cylinder 31 is attached to the lower surface of the second member 52.

  The effects of the present invention can also be obtained when the second member 52 is integrally formed at the end of the first cylinder 53. That is, since the base 51 is used as an exhaust gas passage, it is not necessary to provide a separate exhaust gas passage, and the heat exchanger 50 can be downsized.

In addition, according to the heat exchanger 50, by forming the second member 52 and the first cylinder 53 integrally, the number of parts can be reduced and the number of assembling steps can be reduced. .
Another embodiment will be described with reference to the next figure.

Next, Embodiment 3 of the present invention will be described with reference to the drawings.
FIG. 9 shows a cross-sectional configuration of the heat exchanger according to the third embodiment, corresponding to FIG.
As shown in FIG. 9, in the heat exchanger 60, the second member 62 constituting the base body 61 is integrally formed from the end of the second cylinder 63. Further, the first cylinder 27 is formed with a flange 64 extending toward the water discharge port 63 a of the second cylinder 63, and the flange 64 is supported by being joined to the inner peripheral surface of the second cylinder 63. ing.

  Even when the second member 62 is formed integrally with the end of the second cylinder 63, the effects of the present invention can be obtained. That is, since the base body 61 is used as an exhaust gas passage, it is not necessary to provide a separate exhaust gas passage, and the heat exchanger 60 can be downsized.

In addition, by forming the second member 62 and the second cylindrical body 63 integrally, the number of parts can be reduced and the number of assembling steps can be reduced.
Further, by extending the flange portion 64 toward the water discharge port 63a, it is possible to prevent bubbles from being accumulated on the lower surface of the flange portion 64 even when water is boiled. Air bubbles can be prevented from accumulating and water can flow smoothly.
Another embodiment will be described with reference to the next figure.

Next, a fourth embodiment of the present invention will be described with reference to the drawings.
FIG. 10 shows a cross-sectional configuration of the heat exchanger according to the fourth embodiment, corresponding to FIG.
In the heat exchanger 70, the central axis of the second cylinder 73 coincides with the central axis 72 of the catalyst carrier 71. In addition, the central axis 76 of the first cylinder 75 is shifted from the central axis 72 of the catalyst carrier 71 toward the σ5 water discharge port 31d. That is, the center axis 76 of the first cylinder 75 is shifted to the water discharge port 31d side with respect to the center axis 72 of the second cylinder 73.

The water discharge port 31d and the exhaust gas discharge port 43 are provided 180 degrees apart from the central axis 72 of the catalyst carrier 71.
In addition, formation of an exhaust-gas control part (FIG. 1, code | symbol 27a) is arbitrary. When forming the exhaust gas restricting portion, the depth changes in the circumferential direction as the distance between the catalyst case 77 and the first cylinder 75 changes.

  The first cylinder 75 is shifted toward the water discharge port 31d with respect to the catalyst carrier 71 and the second cylinder 73. By shifting to the water discharge port 31d side, the flow channel area of the water on the water discharge port 31d side is narrowed (σ6), and the flow channel area of the part away from the water discharge port 31d is widened (σ7). By reducing the area of the flow path that passes through the shortest distance from the water introduction port to the water discharge port 31d, the flow rate of water that passes through the shortest distance is reduced. On the other hand, the flow path area of the part far from the water discharge port 31d and difficult to flow of water is expanded, and the flow rate of water is increased. Thereby, water can be flowed more uniformly over the entire circumference between the first cylinder 75 and the second cylinder 73. By flowing water more uniformly, water can flow smoothly and the efficiency of heat exchange can be improved.

  Furthermore, providing the exhaust gas discharge port 43 with respect to the water discharge port 31d with the central axis 72 of the catalyst carrier 71 interposed therebetween has the following effects.

  The first cylinder 75 is shifted toward the water discharge port 31d with reference to the central axis 72 of the catalyst carrier 71. That is, the first cylinder 75 is shifted in a direction away from the exhaust gas discharge port 43. By shifting, the flow area of the exhaust gas formed between the catalyst case 77 and the first cylinder 75 is narrow on the exhaust gas exhaust port 43 side (σ8), and is a part away from the exhaust gas exhaust port 43 ( (Σ9). By reducing the area of the flow path that passes through the shortest distance to the exhaust gas discharge port 43, the flow rate of the exhaust gas that passes through the shortest distance is reduced. On the other hand, the flow area of the part far from the exhaust gas discharge port 43 and difficult to flow the exhaust gas is widened, and the flow rate of the exhaust gas is increased. Thereby, the exhaust gas can flow more uniformly over the entire circumference between the catalyst case 77 and the first cylinder 75. By flowing the exhaust gas more uniformly, the exhaust gas can flow smoothly and the efficiency of heat exchange can be increased.

  The heat exchanger according to the present invention can be applied to a cogeneration apparatus and other uses. In the heat exchanger according to the present invention, it is desirable to use cooling water as water, and an optimum type of medium can be used depending on the application.

  The heat exchanger of the present invention is suitable for a cogeneration apparatus.

  10, 50, 60, 70 ... heat exchanger, 11, 71 ... catalyst carrier, 12, 77 ... catalyst case, 13, 51, 61 ... base, 24 ... first member, 25, 52, 62 ... second Members 27, 53, 75 ... first cylinder, 31, 63, 73 ... second cylinder, 37 ... exhaust gas inlet, 43 ... exhaust gas outlet, 64 ... buttocks.

Claims (5)

A base to which an exhaust gas introduction port for introducing exhaust gas is connected, a catalyst case supported by the base and holding a catalyst carrier, and surrounding the catalyst case and passing through the catalyst carrier between the catalyst case In a heat exchanger composed of a first cylinder through which exhaust gas flows and a second cylinder that surrounds the first cylinder and in which water flows between the first cylinder,
The base includes a first member connected to the exhaust gas introduction port and to which the catalyst case is attached, and a second member joined to the first member on the downstream side of the first member. And a hollow body that also serves as a passage for the exhaust gas,
The second member is
A bottom extending from the end on the exhaust gas inlet side of the first cylinder toward the second cylinder, and a wall raised from the periphery of the bottom toward the first member,
A heat exchanger characterized by having an exhaust gas outlet for exhausting exhaust gas purified by the catalyst carrier and closing one end of the second cylinder . The bottom, the heat exchanger according to claim 1, characterized in that it is formed integrally with the end portion of the exhaust gas inlet side of the first cylindrical body. A base to which an exhaust gas introduction port for introducing exhaust gas is connected, a catalyst case supported by the base and holding a catalyst carrier, and surrounding the catalyst case and passing through the catalyst carrier between the catalyst case In a heat exchanger composed of a first cylinder through which exhaust gas flows and a second cylinder that surrounds the first cylinder and in which water flows between the first cylinder,
The base includes a first member connected to the exhaust gas introduction port and to which the catalyst case is attached, and a second member joined to the first member on the downstream side of the first member. And a hollow body that also serves as a passage for the exhaust gas,
The second member is integrally formed from an end portion of the second cylinder, and the first cylinder is formed at the end of the first cylinder on the exhaust gas inlet side of the second cylinder. A flange extending toward the body is formed, and the flange is supported by being joined to the inner peripheral surface of the second cylinder ,
A heat exchanger having an exhaust gas exhaust port for exhausting exhaust gas purified by the catalyst carrier. The heat exchanger according to claim 3, wherein the flange is extended toward the water discharge port formed in the second cylindrical body. The first cylinder is shifted toward the water discharge port with respect to the central axis of the catalyst carrier,
The heat according to any one of claims 1 to 4, wherein the exhaust gas discharge port is provided 180 degrees away from the water discharge port with reference to a central axis of the catalyst carrier. Exchanger.

Images