Heat exchanger

Abstract

The present application provides a heat exchanger capable of improving heat recovery performance and suppressing melting of a component constituting a flow path of a second fluid. A heat exchanger (100) includes: a heat recovery component (1) through which a first fluid can flow; an inner cylinder (10) that houses the heat recovery component (1); an outer cylinder (20) that has a supply port (21) through which a second fluid can be supplied and a discharge port (22) through which the second fluid can be discharged, and is disposed at a radially outer side of the inner cylinder (10) at a space apart from the inner cylinder (10) to constitute a flow path (60) of the second fluid therebetween; a supply pipe (30) connected to the supply port (21); and a discharge pipe (40) connected to the discharge port (22). The heat recovery component (1) is disposed such that, with reference to a flow path direction of the first fluid, an axial center portion (C1) of the heat recovery component (1) is located more on a downstream side than an axial center portion (C2) of the inner cylinder (10), and a downstream end portion (2) of the heat recovery component (1) is located more on an upstream side than a downstream end portion (61b) of the flow path (60) of the second fluid.

Description

Technical Field

[0001] This invention relates to heat exchangers. Background Technology

[0002] In recent years, there has been a demand for improved fuel economy in automobiles. In particular, to prevent the deterioration of fuel economy during engine start-up and subsequent engine cooling, systems are expected to preheat coolant, engine oil, and automatic transmission fluid (ATF) to reduce friction losses. Additionally, systems that heat catalysts to pre-activate catalysts used for exhaust gas purification are also anticipated.

[0003] As an example of the aforementioned system, there is a heat exchanger. A heat exchanger is a device that performs heat exchange between a first fluid and a second fluid by allowing a first fluid to flow inside and a second fluid to flow outside. In this heat exchanger, heat is exchanged from a high-temperature fluid (e.g., exhaust gas) to a low-temperature fluid (e.g., cooling water), thereby enabling efficient utilization of heat.

[0004] As a heat exchanger for recovering heat from high-temperature gases such as automobile exhaust, a heat exchanger is known that comprises: a hollow columnar honeycomb structure having an inner peripheral wall, an outer peripheral wall, and a partition wall disposed between the inner and outer peripheral walls and dividing the space into multiple compartments, the multiple compartments extending from a first end face to a second end face to form a flow path for a first fluid; a first outer cylinder component fitted to the surface of the outer peripheral wall of the columnar honeycomb structure; an inner cylinder component fitted to the surface of the inner peripheral wall of the columnar honeycomb structure; and an upstream cylindrical component having open gaps in a manner that form a flow path for the first fluid. The heat exchanger comprises: a portion disposed radially inside the inner cylinder component; a cylindrical connecting component connecting the upstream end of the first outer cylinder component to the upstream side of the upstream cylindrical component in a manner constituting a flow path for the first fluid; a downstream cylindrical component connected to the downstream end of the first outer cylinder component and having a portion disposed radially outside the inner cylinder component with an open gap in a manner constituting a flow path for the first fluid; a second outer cylinder component disposed radially outside the first outer cylinder component with an open gap in a manner constituting a flow path for the second fluid; and an on / off valve disposed at the downstream end of the inner cylinder component (Patent Document 1). The heat exchanger having this structure can switch between promoting and inhibiting heat recovery from the first fluid to the second fluid by opening and closing the on / off valve. Furthermore, in this heat exchanger, the cylindrical component has a tapered portion that narrows from the second end face of the columnar honeycomb structure toward the downstream end. By controlling the ratio of the difference between the inner diameter of the downstream end of the inner cylindrical component and the inner diameter of the downstream end of the upstream cylindrical component to within ±20%, or by extending the downstream end of the upstream cylindrical component to a position further downstream than the second end face of the columnar honeycomb structure, the backflow of the first fluid can be suppressed during heat recovery suppression, thus providing good thermal shielding performance.

[0005] Existing technical documents

[0006] Patent documents

[0007] Patent Document 1: International Publication No. 2021 / 171668 Summary of the Invention

[0008] The heat exchanger in the aforementioned patent document 1 does not specifically focus on the flow path of the second fluid formed between the first outer cylinder component and the second outer cylinder component.

[0009] In further research aimed at improving the heat recovery performance of the heat exchanger, the inventors of this invention discovered that regions where the second fluid stagnates exist within the flow path of the second fluid, and that boiling of the stagnant second fluid in these regions leads to a decrease in heat recovery performance. Furthermore, it was learned that if the stagnant second fluid boils, the components surrounding it that constitute the flow path of the second fluid are prone to melting and damage.

[0010] The present invention was implemented to solve the problems described above, and its object is to provide a heat exchanger that can improve heat recovery performance by suppressing the boiling of a second fluid and suppress the melting loss of components constituting the flow path of the second fluid.

[0011] The inventors of this invention have conducted in-depth research on heat exchangers of various structures and have found that by controlling the position of the heat recovery components, the above-mentioned problems can be solved, thus completing this invention.

[0012] That is, the present invention is a heat exchanger, wherein it comprises:

[0013] A heat recovery component that allows for the flow of a first fluid;

[0014] The inner cylinder houses the heat recovery component;

[0015] The outer cylinder has a supply port for supplying a second fluid and a discharge port for discharging the second fluid, and is arranged radially outside the inner cylinder at an open interval to form a flow path for the second fluid between the outer cylinder and the inner cylinder.

[0016] A supply pipe, which is connected to the supply port; and

[0017] A discharge pipe is connected to the discharge outlet.

[0018] The heat recovery component is configured such that, with the flow direction of the first fluid as a reference, the axial center of the heat recovery component is further downstream than the axial center of the inner cylinder, and the downstream end of the heat recovery component is further upstream than the downstream end of the flow path of the second fluid.

[0019] Invention Effects

[0020] According to the present invention, a heat exchanger can be provided that can improve heat recovery performance and suppress melting loss of components constituting the flow path of the second fluid. Attached Figure Description

[0021] Figure 1 This is a cross-sectional view of the heat exchanger according to Embodiment 1 of the present invention, parallel to the flow direction of the first fluid.

[0022] Figure 2 yes Figure 1 A cross-sectional view of the a-a' line in a heat exchanger.

[0023] Figure 3 This is a cross-sectional view perpendicular to the axis of a honeycomb structure that can be used as a heat recovery component.

[0024] Figure 4This is a cross-sectional view perpendicular to the axis of a honeycomb structure that can be used as a heat recovery component.

[0025] Figure 5 This is a cross-sectional view of the heat exchanger according to Embodiment 2 of the present invention, parallel to the flow direction of the first fluid.

[0026] Figure 6 yes Figure 5 A cross-sectional view of the b-b' line in a heat exchanger.

[0027] Figure 7 This is an enlarged cross-sectional view of the periphery of one end of the flow path of the second fluid.

[0028] Figure 8 This is an enlarged cross-sectional view of the periphery of one end of the flow path of the second fluid.

[0029] Figure 9 This is a cross-sectional view of the heat exchanger according to Embodiment 3 of the present invention, parallel to the flow direction of the first fluid.

[0030] Figure 10 This is a cross-sectional view of another heat exchanger according to Embodiment 3 of the present invention, parallel to the flow direction of the first fluid.

[0031] Figure 11 This is a cross-sectional view of the heat exchanger according to Embodiment 4 of the present invention, parallel to the flow direction of the first fluid.

[0032] Figure 12 This is a cross-sectional view of the heat exchanger according to Embodiment 5 of the present invention, parallel to the flow direction of the first fluid.

[0033] Figure 13 This is a cross-sectional view of the heat exchanger according to Embodiment 6 of the present invention, parallel to the flow direction of the first fluid.

[0034] Symbol Explanation

[0035] 1…Heat recovery component, 2…Downstream end, 10…Inner cylinder, 11…High thermal resistance treatment section, 12…Smoothing section, 20…Outer cylinder, 21…Supply port, 22…Discharge port, 23…Bend structure, 24…Weld bead section, 25…Between diameter structure section, 30…Supply pipe, 40…Discharge pipe, 50…Flow path blocking component, 60…Flow path of the second fluid, 61a…Upstream end, 61b…Downstream end, 100, 200, 300, 40 0, 500, 600, 700… heat exchanger, 210… first cylindrical component, 220… second cylindrical component, 230… first cylindrical connecting component, 240… second cylindrical connecting component, 250… third cylindrical component, 260… on / off valve, 270… sealing material, 1000, 2000… honeycomb structure, 1100… outer peripheral wall, 1200… compartment, 1300… partition wall, 1400… inner peripheral wall, C1, C2… axial center. Detailed Implementation

[0036] This invention relates to a heat exchanger comprising: a heat recovery component capable of supplying a first fluid; an inner cylinder housing the heat recovery component; an outer cylinder having a supply port for supplying a second fluid and a discharge port for discharging the second fluid, and being radially positioned radially outside the inner cylinder at an open interval to form a flow path for the second fluid between the outer and inner cylinders; a supply pipe connected to the supply port; and a discharge pipe connected to the discharge port. The heat recovery component is configured such that, based on the flow path direction of the first fluid, its axial center is further downstream than the axial center of the inner cylinder, and its downstream end is further upstream than the downstream end of the flow path of the second fluid. The heat exchanger may include a boiling suppression section within the flow path of the second fluid to suppress boiling of the second fluid.

[0037] Hereinafter, embodiments of the heat exchanger of the present invention will be specifically described with reference to the accompanying drawings. The present invention is not limited to the following embodiments, and it should be understood that appropriate modifications and improvements to the following embodiments, based on ordinary knowledge of those skilled in the art, can also fall within the scope of the present invention without departing from its spirit.

[0038] (Implementation Method 1)

[0039] Figure 1 This is a cross-sectional view of the heat exchanger according to Embodiment 1 of the present invention, parallel to the flow direction of the first fluid. Additionally, Figure 2 yes Figure 1 A cross-sectional view of the a-a' line in a heat exchanger.

[0040] like Figure 1 and Figure 2As shown, the heat exchanger 100 according to Embodiment 1 of the present invention includes: a heat recovery component 1, an inner cylinder 10, an outer cylinder 20, a supply pipe 30, and a discharge pipe 40.

[0041] <Heat Recovery Component 1>

[0042] The heat recovery component 1 is a component capable of supplying the flow of the first fluid. The heat recovery component 1 has the function of recovering the heat of the first fluid when it flows. The heat recovery component 1 is housed inside the inner cylinder 10.

[0043] Although it also depends on the shape of the flow path 60 of the second fluid, the flow of the second fluid sometimes slows down around the axial end of the flow path 60 (especially the upstream end 61a of the flow path 60 of the second fluid, when the flow direction of the first fluid is taken as a reference). In this case, stagnation (stagnation) of the second fluid is likely to occur around the axial end of the flow path 60, and sometimes the temperature of the second fluid continues to rise, causing the second fluid to boil. If this happens, the heat recovery performance is reduced, and the surrounding components (inner cylinder 10 and outer cylinder 20) are prone to melting.

[0044] Therefore, the heat recovery component 1 is configured such that, with reference to the flow direction of the first fluid, the axial center C1 of the heat recovery component 1 is further downstream than the axial center C2 of the inner cylinder 10, and the downstream end 2 of the heat recovery component 1 is further upstream than the downstream end 61b of the flow path 60 of the second fluid. By positioning the heat recovery component 1 in this manner, the flow path of the first fluid before entering the heat recovery component 1 is widened. As a result, in this portion, the flow velocity of the first fluid decreases, thereby reducing the heat transfer rate and suppressing the transfer of heat from the first fluid to the second flow path via the inner cylinder 10. Furthermore, the distance between the upstream end 61a of the flow path 60 of the second fluid and the heat recovery component 1 also increases, thus suppressing the heat input from the heat recovery component 1 around the upstream end 61a of the flow path 60 of the second fluid, thereby lowering the temperature of the second fluid. As a result, boiling of the second fluid around the upstream end 61a of the flow path 60 of the second fluid can be suppressed.

[0045] With the flow direction of the first fluid as a reference, the downstream end 2 of the heat recovery component 1 is preferably positioned at an upstream end 10 mm or more away from the downstream end 61b of the flow path 60 of the second fluid. By positioning the downstream end 2 of the heat recovery component 1 at this location, the aforementioned effect can be stably improved.

[0046] With the flow direction of the first fluid as a reference, the downstream end 2 of the heat recovery component 1 is preferably positioned upstream of the flow path 60 of the second fluid at a length of at least 10% from the downstream end 61b of the flow path 60. By positioning the downstream end 2 of the heat recovery component 1 at this location, the aforementioned effect can be stably improved.

[0047] With the flow direction of the first fluid as a reference, the length (axial length) of the heat recovery component 1 is preferably 20% to 90% of the length of the flow path 60 of the second fluid. By controlling the length of the heat recovery component 1 to this extent, the above-mentioned effect can be steadily improved.

[0048] The heat recovery component 1 is not particularly limited, but is preferably a honeycomb structure.

[0049] Here, a cross-section perpendicular to the axial direction (the flow path direction of the first fluid) of the honeycomb structure that can be used as heat recovery component 1 is shown. Figure 3 and Figure 4 .

[0050] Figure 3 The honeycomb structure 1000 shown has an outer peripheral wall 1100 and a plurality of partitions 1300 disposed on the inner side of the outer peripheral wall 1100 and dividing it into a plurality of compartments 1200. These compartments 1200 extend from a first end face to a second end face to form a flow path for a first fluid. Furthermore, Figure 4 The honeycomb structure 2000 shown has an outer peripheral wall 1100, an inner peripheral wall 1400, and a partition wall 1300. The partition wall 1300 is disposed between the outer peripheral wall 1100 and the inner peripheral wall 1400 and divides to form a plurality of compartments 1200. The plurality of compartments 1200 extend from a first end face to a second end face to form a flow path for a first fluid.

[0051] The shape (outer shape) of the honeycomb structures 1000 and 2000 can be appropriately set according to the shape of the inner cylinder 10, and there is no particular limitation. Examples of the shape (outer shape) of the honeycomb structures 1000 and 2000 include: cylinders, elliptical cylinders, square prisms, or other polygonal prisms. The shape of the hollow part (the inner area of ​​the inner peripheral wall 1400) of the honeycomb structure 2000 is not particularly limited, and can be the same as or different from the outer shape of the honeycomb structure 2000. However, from the viewpoint of resistance to external impacts, thermal stress, etc., it is preferable to be the same.

[0052] The thickness of the outer peripheral wall 1100 and the inner peripheral wall 1400 is preferably greater than the thickness of the partition wall 1300. By adopting such a configuration, the strength of the outer peripheral wall 1100 and the inner peripheral wall 1400, which are prone to damage (e.g., cracks, fissures) due to external impacts or thermal stress caused by the temperature difference between the first fluid and the second fluid, can be improved.

[0053] The thicknesses of the outer peripheral wall 1100, the partition wall 1300, and the inner peripheral wall 1400 can be appropriately adjusted according to the application. For example, when the heat exchanger 100 is used for general heat exchange applications, the thicknesses of the outer peripheral wall 1100 and the inner peripheral wall 1400 are preferably greater than 0.3 mm and less than 10 mm, more preferably 0.5 mm to 5 mm, and even more preferably 1 mm to 3 mm. In addition, when the heat exchanger 100 is used for heat storage applications, it is also preferable to make the thickness of the outer peripheral wall 1100 more than 10 mm, thereby increasing the heat capacity of the outer peripheral wall 1100.

[0054] The thickness of the partition wall 1300 is preferably 0.1 to 1 mm, more preferably 0.2 to 0.6 mm. By making the thickness of the partition wall 1300 0.1 mm or more, the mechanical strength of the honeycomb structures 1000 and 2000 can be sufficiently improved. In addition, by making the thickness of the partition wall 1300 1 mm or less, the problems of increased pressure loss due to the reduction of the opening area or decreased heat recovery efficiency due to the reduction of the contact area with the first fluid can be suppressed.

[0055] The outer peripheral wall 1100, the partition wall 1300, and the inner peripheral wall 1400 are mainly composed of ceramics. "Mainly composed of ceramics" means that ceramics account for more than 50% of the total mass.

[0056] The porosity of the outer peripheral wall 1100, the partition wall 1300, and the inner peripheral wall 1400 is preferably 10% or less, more preferably 5% or less, and particularly preferably 3% or less. Alternatively, their porosity may be 0%. By making their porosity 10% or less, the thermal conductivity can be improved.

[0057] The outer peripheral wall 1100, the partition wall 1300, and the inner peripheral wall 1400 preferably contain SiC (silicon carbide), which has high thermal conductivity, as the main component. "Containing SiC (silicon carbide) as the main component" means that the mass percentage of SiC (silicon carbide) in the total mass is more than 50% by mass.

[0058] More specifically, the materials used for the outer peripheral wall 1100, the partition wall 1300, and the inner peripheral wall 1400 can be Si-impregnated SiC, (Si+Al)-impregnated SiC, metal composite SiC, recrystallized SiC, Si3N4, and SiC, etc. Among these, considering the ease of manufacturing and high thermal conductivity, Si-impregnated SiC and (Si+Al)-impregnated SiC are preferred.

[0059] The cell density (i.e., the number of cells per unit area) in the cross-section of the honeycomb structures 1000 and 2000 perpendicular to the flow direction of the first fluid is not particularly limited, and can be adjusted appropriately according to the application, etc., preferably 4 to 320 cells / cm². 2 The range. By making the compartment density 4 compartments / cm². 2 The above ensures sufficient strength for the partition wall 1300, the honeycomb structure 1000, and 2000, as well as the effective GSA (geometric surface area). Furthermore, by achieving a compartment density of 320 compartments / cm²... 2 The following measures can prevent an increase in pressure loss during the flow of the first fluid.

[0060] The isostatic compressive strength of the honeycomb structures 1000 and 2000 is preferably greater than 100 MPa, more preferably greater than 150 MPa, and even more preferably greater than 200 MPa. If the isostatic compressive strength of the honeycomb structures 1000 and 2000 exceeds 100 MPa, then the honeycomb structures 1000 and 2000 exhibit excellent durability. The isostatic compressive strength of the honeycomb structures 1000 and 2000 can be determined according to the method for determining isostatic compressive breaking strength specified in the automotive standard issued by the China Automotive Technology and Research Center (JASO) M505-87.

[0061] The diameter (outer diameter) of the outer peripheral wall 1100 in the cross-section orthogonal to the flow direction of the first fluid is preferably 20 to 200 mm, more preferably 30 to 100 mm. By setting such a diameter, the heat recovery efficiency can be improved. If the outer peripheral wall 1100 is not circular, the diameter of the largest circle inscribed in the cross-sectional shape of the outer peripheral wall 1100 is set as the diameter of the outer peripheral wall 1100.

[0062] Furthermore, in the case of the honeycomb structure 2000, the diameter of the inner peripheral wall 1400 in the cross-section orthogonal to the flow path direction of the first fluid is preferably 1 to 60 mm, more preferably 2 to 30 mm. If the cross-sectional shape of the inner peripheral wall 1400 is not circular, the diameter of the largest circle inscribed in the cross-sectional shape of the inner peripheral wall 1400 is set as the diameter of the inner peripheral wall 1400.

[0063] For the thermal conductivity of the 1000 and 2000 honeycomb structures, at 25°C, it is preferably 50 W / (m·K) or higher, more preferably 100 to 300 W / (m·K), and even more preferably 120 to 300 W / (m·K). By achieving a thermal conductivity range for the 1000 and 2000 honeycomb structures, good thermal conductivity is achieved, enabling efficient heat transfer from the honeycomb structures to the outside. It should be noted that the thermal conductivity value is obtained using the laser flash method (JIS R1611-1997).

[0064] When the exhaust gas flows as the first fluid through the compartment 1200 of the honeycomb structure 1000, 2000, the catalyst can be supported on the partition wall 1300 of the honeycomb structure 1000, 2000. If the catalyst is supported on the partition wall 1300, CO, NOx, HC, etc. in the exhaust gas can be converted into harmless substances through catalytic reaction, and the heat of reaction generated during the catalytic reaction can also be used for heat exchange. As a catalyst, it is preferable to have at least one element selected from the group consisting of noble metals (platinum, rhodium, palladium, ruthenium, indium, silver and gold), aluminum, nickel, zirconium, titanium, cerium, cobalt, manganese, zinc, copper, tin, iron, niobium, magnesium, lanthanum, samarium, bismuth and barium. The above elements can be contained in the form of elemental metals, metal oxides or other metal compounds.

[0065] <Inner Cylinder 10>

[0066] The inner cylinder 10 is a component that houses the heat recovery component 1. The inner cylinder 10 is fitted onto the outer peripheral surface of the heat recovery component 1, which is parallel to the flow direction of the first fluid.

[0067] In this specification, "fitting" means that the heat recovery component 1 and the inner cylinder 10 are fixed in a mutually mating state. Therefore, the fitting of the heat recovery component 1 and the inner cylinder 10 includes not only fixing methods such as clearance fit, interference fit, and thermo-press fit, but also situations in which the heat recovery component 1 and the inner cylinder 10 are fixed to each other by means of brazing, welding, diffusion bonding, etc.

[0068] The shape of the inner cylinder 10 is not particularly limited and can be various cylindrical shapes such as cylindrical or square.

[0069] The axial direction of the inner cylinder 10 is preferably aligned with the axial direction of the heat recovery component 1, and the central axis of the inner cylinder 10 is preferably aligned with the central axis of the heat recovery component 1. In addition, the diameter (outer diameter and inner diameter) of the inner cylinder 10 can be the same throughout the entire axial direction, but it is also possible to reduce or expand the diameter in at least a portion (e.g., at both ends of the axial direction).

[0070] It should be noted that when the inner cylinder 10 is not cylindrical, the outer diameter and inner diameter of the inner cylinder 10 refer to the diameters of the largest circles circumscribed and inscribed in the cross-sectional shape of the inner cylinder 10 perpendicular to the flow direction of the first fluid.

[0071] The inner cylinder 10 preferably has an inner circumferential surface shape that corresponds to the outer circumferential surface of the heat recovery component 1, which is parallel to the flow direction of the first fluid. By having the inner circumferential surface of the inner cylinder 10 in direct contact with the outer circumferential surface of the heat recovery component 1, which is parallel to the flow direction of the first fluid, good heat conductivity is achieved, and the heat efficiency within the heat recovery component 1 can be effectively transferred to the inner cylinder 10.

[0072] From the viewpoint of improving heat recovery efficiency, the area of ​​the portion of the outer peripheral surface of the heat recovery component 1, which is surrounded and covered by the inner cylinder 10 and is parallel to the flow direction of the first fluid, is preferably a high proportion relative to the entire area of ​​the outer peripheral surface of the heat recovery component 1, which is parallel to the flow direction of the first fluid. Specifically, this area proportion is preferably 80% or more, more preferably 90% or more, and even more preferably 100% (i.e., the entire outer peripheral surface of the heat recovery component 1, which is parallel to the flow direction of the first fluid, is surrounded and covered by the inner cylinder 10).

[0073] The material of the inner cylinder 10 is not particularly limited, but from a manufacturing point of view, metal is preferred. Furthermore, if the inner cylinder 10 is made of metal, it is advantageous because it can be easily welded to the outer cylinder 20, etc. For example, stainless steel, titanium alloy, copper alloy, aluminum alloy, brass, etc., can be used as the material for the inner cylinder 10. Among these, stainless steel is preferred due to its high durability, reliability, and low cost.

[0074] The thickness of the inner cylinder 10 is not particularly limited, but is preferably 0.1 mm or more, more preferably 0.3 mm or more, and even more preferably 0.5 mm or more. By ensuring the thickness of the inner cylinder 10 is 0.1 mm or more, durability and reliability can be ensured. Furthermore, the thickness of the inner cylinder 10 is preferably 10 mm or less, more preferably 5 mm or less, and even more preferably 3 mm or less. By ensuring the thickness of the inner cylinder 10 is 10 mm or less, thermal resistance can be reduced and thermal conductivity improved.

[0075] <Outer cylinder 20>

[0076] The outer cylinder 20 has a supply port 21 for supplying a second fluid and a discharge port 22 for discharging the second fluid. In addition, the outer cylinder 20 is arranged radially outside the inner cylinder 10 with an open gap to form a flow path 60 for the second fluid between the outer cylinder 20 and the inner cylinder 10.

[0077] The axial direction of the outer cylinder 20 is preferably aligned with the axial direction of the inner cylinder 10, and the central axis of the outer cylinder 20 is preferably aligned with the central axis of the inner cylinder 10.

[0078] The outer cylinder 20 is preferably configured such that, with the flow direction of the first fluid as a reference, the inner circumferential surfaces of the upstream end side and the downstream end side are in direct or indirect contact with the outer circumferential surface of the inner cylinder 10.

[0079] There are no particular limitations on the method of fixing the inner circumferential surfaces of the upstream end and downstream end of the outer cylinder 20 to the outer circumferential surface of the inner cylinder 10. In addition to fixing methods such as clearance fit, interference fit, and hot pressing fit, brazing, welding, diffusion bonding, etc. can also be used.

[0080] The shape of the outer cylinder 20 is not particularly limited and can be various cylindrical shapes such as cylindrical or square.

[0081] The diameter (outer and inner diameter) of the outer cylinder 20 can be the same throughout the entire axial direction; however, it can also be reduced or expanded in at least a portion (e.g., the axial central portion, the two axial ends, etc.). For example, by reducing the diameter of the axial central portion of the outer cylinder 20, the second fluid can be distributed throughout the entire outer circumference of the inner cylinder 10 within the outer cylinder 20 on the sides of the supply port 21 and the discharge port 22. Therefore, the amount of second fluid that does not contribute to heat exchange in the axial central portion is reduced, thereby improving the heat exchange efficiency.

[0082] It should be noted that when the outer cylinder 20 is not cylindrical, the outer diameter and inner diameter of the outer cylinder 20 refer to the diameters of the largest circles circumscribed and inscribed in the cross-sectional shape of the outer cylinder 20 perpendicular to the flow direction of the first fluid.

[0083] The material of the outer cylinder 20 is not particularly limited and can be the same as that of the inner cylinder 10 mentioned above.

[0084] The thickness of the outer cylinder 20 is not particularly limited and can be set to the same thickness as the inner cylinder 10 mentioned above.

[0085] <Supply pipe 30 and discharge pipe 40>

[0086] The supply pipe 30 is connected to the supply port 21 of the outer cylinder 20, and the discharge pipe 40 is connected to the discharge port 22 of the outer cylinder 20. By connecting the supply pipe 30 and the discharge pipe 40 in this way, the supply and discharge of the second fluid between the inner cylinder 10 and the outer cylinder 20 can be achieved.

[0087] The supply pipe 30 and the discharge pipe 40 can extend in the same direction or in different directions.

[0088] In the heat exchanger 100 according to Embodiment 1 of the present invention, with the flow path direction of the first fluid as a reference, the heat recovery component 1 is arranged such that the axial center C1 of the heat recovery component 1 is further downstream than the axial center C2 of the inner cylinder 10, and the downstream end 2 of the heat recovery component 1 is further upstream than the downstream end 61b of the flow path 60 of the second fluid. Therefore, the heat recovery performance can be improved, and the melting loss of the components constituting the flow path 60 of the second fluid can be suppressed.

[0089] (Implementation Method 2)

[0090] The heat exchanger according to Embodiment 2 of the present invention differs from the heat exchanger 100 according to Embodiment 1 of the present invention in that: within the flow path of the second fluid, a flow path blocking component 50 is provided as a boiling suppression part.

[0091] Figure 5 This is a cross-sectional view of the heat exchanger according to Embodiment 2 of the present invention, parallel to the flow direction of the first fluid. Additionally, Figure 6 yes Figure 5 A cross-sectional view of the b-b' line in the heat exchanger. It should be noted that... Figure 5 The example shown is a hollow honeycomb structure 2000 used as the heat recovery component 1.

[0092] like Figure 5 and Figure 6 As shown, the heat exchanger 200 according to Embodiment 2 of the present invention includes: an inner cylinder 10, an outer cylinder 20, a supply pipe 30, a discharge pipe 40, and a flow path blocking member 50 serving as a boiling suppression section. Furthermore, the heat exchanger 200 according to Embodiment 2 of the present invention also includes: a first cylindrical member 210, a second cylindrical member 220, a first cylindrical connecting member 230, a second cylindrical connecting member 240, a third cylindrical member 250, and an on / off valve 260.

[0093] It should be noted that the constituent elements having the same symbols as those appearing in the description of the heat exchanger 100 according to Embodiment 1 of the present invention are the same as the constituent elements of the heat exchanger 200 according to Embodiment 2 of the present invention, and therefore, their description is omitted.

[0094] <Flow path blocking component 50>

[0095] The flow path blocking component 50 is a boiling suppression part that suppresses the boiling of the second fluid. The flow path blocking component 50 is configured to block at least a portion of the flow path 60 of the second fluid.

[0096] As described in Embodiment 1, although it also depends on the shape of the flow path 60 of the second fluid, the flow of the second fluid sometimes slows down around the axial end of the flow path 60. In this case, stagnation (stagnation) of the second fluid is likely to occur around the axial end of the flow path 60, and sometimes the temperature of the second fluid continues to rise, causing the second fluid to boil. If this state occurs, the heat recovery performance is reduced, and the surrounding components (inner cylinder 10 and outer cylinder 20) are prone to melting.

[0097] The flow path blocking component 50 is disposed in the portion where, as described above, stagnation (stagnation) of the second fluid is likely to occur, leading to boiling of the second fluid. Therefore, the flow path blocking component 50 is preferably configured to block at least one end of the flow path 60 of the second fluid, and more preferably to block both ends of the flow path 60 of the second fluid.

[0098] Here, an enlarged cross-section of the periphery of one end of the flow path 60 for the second fluid is shown in the figure. Figure 7When the flow path blocking component 50 is disposed at the end of the flow path 60 of the second fluid, it is preferable to block a length region L less than 50% of the maximum flow path height H of the flow path 60 of the second fluid, measured from the end E of the flow path of the second fluid. By blocking such a region with the flow path blocking component 50, it is difficult for the second fluid to stagnate, and therefore, boiling of the second fluid can be stably suppressed. If a length region exceeding 50% of the maximum flow path height H of the flow path 60 of the second fluid, measured from the end E of the flow path of the second fluid, is blocked, the flow path 60 of the second fluid is reduced too much, and therefore, the heat recovery performance may sometimes be reduced.

[0099] The flow path blocking component 50 is preferably an annular component. By making the flow path blocking component 50 annular, it can be easily positioned at a predetermined location within the flow path 60 of the second fluid. For annular components, for example, two semi-open components can be positioned at predetermined locations within the flow path 60 of the second fluid to form a ring, and then fixed by welding or adhesive.

[0100] The shape of the flow path blocking component 50 can be any shape capable of blocking a specified area, and there are no particular limitations. For example, regarding the shape of the flow path blocking component 50, in a cross-section parallel to the flow direction of the first fluid, except for... Figure 5 and Figure 7 In addition to the triangle shown, it can be exemplified Figure 8 The images shown include sectors (top left), trapezoids (top right), chamfered shapes (bottom left), and irregular shapes (bottom right). It should be noted that... Figure 8 and Figure 7 Similarly, this is an enlarged cross-sectional view of the periphery of one end of the flow path 60 for the second fluid.

[0101] The material used for the flow path blocking component 50 can be any material that is insoluble in the second fluid and has a melting point higher than the boiling point of the second fluid; there are no particular limitations. For example, if the second fluid is water, the material of the flow path blocking component 50 can be a non-water-soluble material with a melting point higher than 100°C. Materials used for the flow path blocking component 50 may include metals and thermosetting resins. Specifically, materials such as stainless steel, titanium alloys, copper alloys, aluminum alloys, brass, phenolic resins, urea-formaldehyde resins, melamine resins, epoxy resins, unsaturated polyester resins, alkyd resins, polyimide resins, polyurethane resins, allyl resins, diallyl phthalate resins, and silicone resins can be used.

[0102] <First cylindrical component 210>

[0103] The first cylindrical component 210 is fitted into the inner peripheral wall 1400 of the honeycomb structure 2000. There is no particular limitation on the fitting method; the same fitting method as described above can be used.

[0104] The first cylindrical component 210 is a cylindrical component having an upstream end and a downstream end, and a portion of its outer peripheral surface is fitted into the inner peripheral wall 1400 of the honeycomb structure 2000. A portion of the outer peripheral surface of the first cylindrical component 210 and the inner peripheral wall 1400 of the honeycomb structure 2000 can be in direct contact, or they can be in indirect contact through a sealing material 270 (e.g., a gasket material or mesh material, annular component, etc.).

[0105] The axial direction of the first cylindrical component 210 is preferably aligned with the axial direction of the honeycomb structure 2000, and the central axis of the first cylindrical component 210 is preferably aligned with the central axis of the honeycomb structure 2000.

[0106] The material of the first cylindrical component 210 is not particularly limited and can be the same as that of the inner cylinder 10 described above.

[0107] The thickness of the first cylindrical component 210 is not particularly limited and can be set to the same thickness as the inner cylinder 10 described above.

[0108] The first cylindrical member 210 may have a tapered portion that tapers in diameter from a position corresponding to the second end face of the honeycomb structure 2000 toward the downstream end. By providing such a tapered portion, the difference between the inner diameter of the downstream end of the first cylindrical member 210 and the inner diameter of the downstream end of the second cylindrical member 220 can be reduced. In this case, during heat recovery suppression (when the on / off valve 260 is open), the flow velocity of the first fluid near the downstream end of the second cylindrical member 220 and the flow velocity of the first fluid near the downstream end of the first cylindrical member 210 can be made to be the same, and therefore, the pressure difference between the downstream end of the second cylindrical member 220 and the downstream end of the first cylindrical member 210 is reduced. As a result, during heat recovery suppression, the backflow of the first fluid flowing from between the first cylindrical member 210 and the second cylindrical member 220 into the honeycomb structure 2000 can be suppressed, thus improving the heat shielding performance.

[0109] <Second cylindrical component 220>

[0110] The second cylindrical member 220 has a portion that is arranged radially inside the first cylindrical member 210 in a way that forms a flow path for the first fluid.

[0111] The second cylindrical component 220 is a cylindrical component having an upstream end and a downstream end.

[0112] The axial direction of the second cylindrical component 220 is preferably aligned with the axial direction of the honeycomb structure 2000, and the central axis of the second cylindrical component 220 is preferably aligned with the central axis of the honeycomb structure 2000.

[0113] The structure of the upstream end of the second cylindrical component 220 is not particularly limited and can be appropriately adjusted according to the shape of other components (such as pipes) to which the upstream end of the second cylindrical component 220 is connected. For example, if the diameter of other components is larger than the diameter of the upstream end, the upstream end can be enlarged.

[0114] The method for fixing the second cylindrical component 220 is not particularly limited; for example, it can be fixed to the inner cylinder 10 by means of the first cylindrical connecting component 230 described later. The fixing method is not particularly limited, and methods similar to those described for fixing the inner cylinder 10 can be used.

[0115] The material of the second cylindrical component 220 is not particularly limited and can be the same as that of the inner cylinder 10 described above.

[0116] The thickness of the second cylindrical component 220 is not particularly limited and can be set to the same thickness as the inner cylinder 10 described above.

[0117] <First cylindrical connecting component 230>

[0118] The first cylindrical connecting member 230 is a cylindrical member that connects the upstream end of the inner cylinder 10 to the upstream side of the second cylindrical member 220 in a manner that forms a flow path for the first fluid. The connection can be either direct or indirect. In the case of an indirect connection, for example, the upstream end of the outer cylinder 20 can be disposed between the upstream end of the inner cylinder 10 and the upstream side of the second cylindrical member 220.

[0119] The axial direction of the first cylindrical connecting member 230 is preferably aligned with the axial direction of the honeycomb structure 2000, and the central axis of the first cylindrical connecting member 230 is preferably aligned with the central axis of the honeycomb structure 2000.

[0120] The material of the first cylindrical connecting component 230 is not particularly limited and can be the same as that of the inner cylinder 10 described above.

[0121] The thickness of the first cylindrical connecting member 230 is not particularly limited and can be set to the same thickness as the inner cylinder 10 described above.

[0122] <Second cylindrical connecting component 240>

[0123] The second cylindrical connecting member 240 is a cylindrical member that connects the downstream end of the inner cylinder 10 to the upstream side of the third cylindrical member 250. The connection can be either direct or indirect. In the case of an indirect connection, for example, the downstream end of the outer cylinder 20 can be disposed between the downstream end of the inner cylinder 10 and the upstream side of the third cylindrical member 250.

[0124] The axial direction of the second cylindrical connecting member 240 is preferably aligned with the axial direction of the honeycomb structure 2000, and the central axis of the second cylindrical connecting member 240 is preferably aligned with the central axis of the honeycomb structure 2000.

[0125] The material of the second cylindrical connecting component 240 is not particularly limited and can be the same as that of the inner cylinder 10 described above.

[0126] The thickness of the second cylindrical connecting member 240 is not particularly limited and can be set to the same thickness as the inner cylinder 10 described above.

[0127] <Third cylindrical component 250>

[0128] The third cylindrical component 250 is a component connected to the downstream side of the second cylindrical connecting component 240.

[0129] The axial direction of the third cylindrical component 250 is preferably aligned with the axial direction of the honeycomb structure 2000, and the central axis of the third cylindrical component 250 is preferably aligned with the central axis of the honeycomb structure 2000.

[0130] The structure of the downstream end of the third cylindrical component 250 is not particularly limited and can be appropriately adjusted according to the shape of other components (such as pipes) to which the downstream end of the third cylindrical component 250 is connected. For example, if the diameter of other components is smaller than the diameter of the downstream end, the downstream end can be reduced in diameter.

[0131] The material of the third cylindrical component 250 is not particularly limited and can be the same as that of the inner cylinder 10 described above.

[0132] The thickness of the third cylindrical component 250 is not particularly limited and can be set to the same thickness as the inner cylinder 10 described above.

[0133] <On / Off Valve 260>

[0134] The on / off valve 260 is disposed on the downstream end side of the first cylindrical member 210. The method of setting the on / off valve 260 is not particularly limited. For example, the on / off valve 260 can be fixed to a rotating shaft (not shown) configured to be rotatably supported by a bearing disposed on the radially outer side of the third cylindrical member 250 and passing through the third cylindrical member 250 and the first cylindrical member 210.

[0135] The shape of the on / off valve 260 is not particularly limited; an appropriate shape can be selected based on the shape of the first cylindrical component 210 configured for the on / off valve 260.

[0136] The on / off valve 260 can be opened and closed by driving (rotating) a shaft using, for example, an actuator (not shown). That is, the on / off valve 260 can be opened and closed by rotating the on / off valve 260 together with the shaft.

[0137] The on / off valve 260 is configured to adjust the flow of a first fluid inside the first cylindrical member 210. Specifically, the on / off valve 260 closes during heat recovery promotion, thereby allowing the first fluid to flow between the first cylindrical member 210 and the second cylindrical member 220 and into the honeycomb structure 2000. Furthermore, the on / off valve 260 opens during heat recovery suppression, thereby allowing the first fluid to flow laterally from the downstream end of the first cylindrical member 210 towards the third cylindrical member 250, and thus discharge to the outside of the heat exchanger 200.

[0138] The heat exchanger 200 according to Embodiment 2 of the present invention includes a flow path blocking member 50 as a boiling suppression part in the flow path 60 of the second fluid. Therefore, it is possible to improve the heat recovery performance and suppress the melting loss of the components constituting the flow path 60 of the second fluid.

[0139] (Implementation Method 3)

[0140] The heat exchanger according to Embodiment 3 of the present invention differs from the heat exchanger 100 according to Embodiment 1 of the present invention in that: as a boiling suppression part, at least a portion of the outer cylinder 20 is provided with a flow path blocking treatment part.

[0141] Figure 9 This is a cross-sectional view of the heat exchanger according to Embodiment 3 of the present invention, parallel to the flow direction of the first fluid.

[0142] like Figure 9 As shown, the heat exchanger 300 according to Embodiment 3 of the present invention includes: an inner cylinder 10, an outer cylinder 20, a supply pipe 30, and a discharge pipe 40. In addition, the heat exchanger 300 has a folding structure 23 formed at at least one end side of the outer cylinder 20 as a flow path blocking treatment unit.

[0143] It should be noted that the constituent elements having the same symbols as those appearing in the description of the heat exchanger 100 according to Embodiment 1 of the present invention are the same as the constituent elements of the heat exchanger 300 according to Embodiment 3 of the present invention, therefore, their description is omitted.

[0144] As described in Embodiment 1, although it also depends on the shape of the flow path 60 of the second fluid, the flow of the second fluid sometimes slows down around the axial end of the flow path 60. In this case, stagnation (stagnation) of the second fluid is likely to occur around the axial end of the flow path 60, and sometimes the temperature of the second fluid continues to rise, causing the second fluid to boil. If this state occurs, the heat recovery performance is reduced, and the surrounding components (inner cylinder 10 and outer cylinder 20) are prone to melting.

[0145] Therefore, in the heat exchanger 300 of Embodiment 3 of the present invention, a foldback structure 23 is formed to block the axial end of the flow path 60 of the second fluid, which is prone to stagnation (stagnation) and boiling as described above. It should be noted that... Figure 9 The image shows an example where the folding structure 23 is formed on both ends of the outer cylinder 20; however, the folding structure 23 may be formed on one end of the outer cylinder 20.

[0146] The folding structure 23 can be manufactured by bending the outer cylinder 20. There are no particular limitations on the type of bending process, and various known methods can be used.

[0147] Figure 10 This is a cross-sectional view of another heat exchanger according to Embodiment 3 of the present invention, parallel to the flow direction of the first fluid.

[0148] like Figure 10 As shown, the heat exchanger 400 according to Embodiment 3 of the present invention includes: an inner cylinder 10, an outer cylinder 20, a supply pipe 30, and a discharge pipe 40. In addition, in this heat exchanger 400, as a flow path blocking treatment section, a weld bead portion 24 is provided on at least one end side of the outer cylinder 20.

[0149] It should be noted that the constituent elements having the same symbols as those appearing in the description of the heat exchanger 100 according to Embodiment 1 of the present invention are the same as the constituent elements of another heat exchanger 400 according to Embodiment 3 of the present invention, and therefore, their description is omitted.

[0150] In the heat exchanger 400 of Embodiment 3 of the present invention, a weld bead portion 24 is formed to block the axial end of the flow path 60 of the second fluid, which is prone to stagnation (stagnation) and boiling as described above. It should be noted that... Figure 10 The example shown is that the weld beads 24 are formed on both ends of the outer cylinder 20; however, the weld beads 24 may be formed on one end of the outer cylinder 20.

[0151] The weld bead section 24 is the part formed by the melting and solidification of the outer cylinder 20 when the outer cylinder 20 is welded to the inner cylinder 10. As for the welding method, there is no particular limitation, and arc welding (such as TIG welding, MIG welding, etc.) can be used.

[0152] It should be noted that, although not illustrated, in the heat exchanger 300 according to Embodiment 3 of the present invention, as a flow path blocking treatment unit, a folding structure 23 and a weld bead portion 24 can be simultaneously formed on at least one end side of the outer cylinder 20. By adopting such a configuration, it is possible to stably suppress the stagnation (stagnation) of the second fluid that would lead to boiling of the second fluid.

[0153] In the heat exchangers 300 and 400 according to Embodiment 3 of the present invention, a flow path blocking treatment part (return structure 23 and / or weld bead part 24) serving as a boiling suppression part is formed in the outer cylinder 20 within the flow path 60 of the second fluid. Therefore, the effect of improving heat recovery performance and suppressing the melting loss of components constituting the flow path 60 of the second fluid can be improved.

[0154] (Implementation Method 4)

[0155] The heat exchanger according to Embodiment 4 of the present invention differs from the heat exchanger 100 according to Embodiment 1 of the present invention in that: as a boiling suppression part, it has a reduced diameter structure of the supply port 21.

[0156] Figure 11 This is a cross-sectional view of the heat exchanger according to Embodiment 4 of the present invention, parallel to the flow direction of the first fluid.

[0157] like Figure 11 As shown, the heat exchanger 500 according to Embodiment 4 of the present invention includes: an inner cylinder 10, an outer cylinder 20, a supply pipe 30, and a discharge pipe 40. In addition, the heat exchanger 500 has a reduced diameter structure 25 for the supply port 21 as a flow path blocking treatment unit.

[0158] Here, "reduced diameter structure 25 of supply port 21" in this specification refers to the supply port 21 or its surrounding structure designed to reduce the diameter of the supply port 21.

[0159] It should be noted that the constituent elements having the same symbols as those appearing in the description of the heat exchanger 100 according to Embodiment 1 of the present invention are the same as the constituent elements of the heat exchanger 500 according to Embodiment 4 of the present invention, therefore, their description is omitted.

[0160] Although it also depends on the shape of the flow path 60 of the second fluid, the flow of the second fluid can sometimes slow down around the supply port 21 (the connection between the outer cylinder 20 and the supply pipe 30). As a result, even around the supply port 21, stagnation (stagnation) of the second fluid can easily occur, and sometimes the temperature of the second fluid continues to rise, causing the second fluid to boil. If this happens, the heat recovery performance is reduced, and the surrounding components (outer cylinder 20 and supply pipe 30) are prone to melting.

[0161] Therefore, in the heat exchanger 500 of Embodiment 4 of the present invention, a narrowing structure 25 is provided at the supply port 21, which is prone to stagnation (stagnation) of the second fluid as described above, which may cause the second fluid to boil. This increases the flow rate of the second fluid flowing into the flow path 60 of the second fluid, and even around the supply port 21, stagnation (stagnation) of the second fluid can be suppressed.

[0162] It should be explained that Figure 11 In the example of the diameter reduction structure 25, the diameter of the supply port 21 is shown to be smaller than the diameter of the discharge port 22. However, the diameter of the supply port 21 can be the same as the diameter of the discharge port 22. An annular component (waist ring, etc.) is provided in the supply port 21 to reduce the diameter. Alternatively, the diameter of the supply port 21 can be reduced by external machining or other methods.

[0163] The reduced diameter structure 25 of the supply port 21 is preferably configured such that the diameter of the supply port 21 is 65% to 95% of the diameter of the discharge port 22. By making the diameter of the supply port 21 less than 95% of the diameter of the discharge port 22, the above-mentioned effects can be stably obtained. In addition, by making the diameter of the supply port 21 more than 65% of the diameter of the discharge port 22, the pressure loss reduction within the flow path 60 of the second fluid can be suppressed. In particular, when the diameter of the supply port 21 is less than 65% of the diameter of the discharge port 22, the second fluid tends to stagnate around the periphery (back side of the connection) of the reduced diameter structure 25.

[0164] The heat exchanger 500 according to Embodiment 4 of the present invention is preferably configured such that a supply port 21 and a discharge port 22 are provided at the axial center of the outer cylinder 20, and a supply pipe 30 and a discharge pipe 40 are respectively connected to the supply port 21 and the discharge port 22. Furthermore, the supply pipe 30 and the discharge pipe 40 preferably extend in different directions. By adopting this configuration, the effects brought about by the reduced diameter structure 25 of the supply port 21 can be stably obtained.

[0165] In the heat exchanger 500 according to Embodiment 4 of the present invention, a reduced diameter structure 25 of the supply port 21 is provided as a boiling suppression part, so that the effect of improving heat recovery performance and suppressing the melting loss of components constituting the flow path 60 of the second fluid can be improved.

[0166] (Implementation Method 5)

[0167] The heat exchanger according to Embodiment 5 of the present invention differs from the heat exchanger 100 according to Embodiment 1 of the present invention in that: as a boiling suppression part, at least a portion of the inner cylinder 10 is provided with a high thermal resistance treatment part.

[0168] Figure 12 This is a cross-sectional view of the heat exchanger according to Embodiment 5 of the present invention, parallel to the flow direction of the first fluid.

[0169] like Figure 12 As shown, the heat exchanger 600 according to Embodiment 5 of the present invention includes: an inner cylinder 10, an outer cylinder 20, a supply pipe 30, and a discharge pipe 40. In addition, the heat exchanger 600 has a high thermal resistance treatment section 11 in at least a portion of the inner cylinder 10.

[0170] It should be noted that the constituent elements having the same symbols as those appearing in the description of the heat exchanger 100 according to Embodiment 1 of the present invention are the same as the constituent elements of the heat exchanger 600 according to Embodiment 5 of the present invention, therefore, their description is omitted.

[0171] As described in Embodiment 1, although it also depends on the shape of the flow path 60 of the second fluid, the flow of the second fluid sometimes slows down around the axial end of the flow path 60. In this case, stagnation (stagnation) of the second fluid is likely to occur around the axial end of the flow path 60, and sometimes the temperature of the second fluid continues to rise, causing the second fluid to boil. If this state occurs, the heat recovery performance is reduced, and the surrounding components (inner cylinder 10 and outer cylinder 20) are prone to melting.

[0172] Therefore, in the heat exchanger 600 of Embodiment 5 of the present invention, a high thermal resistance treatment section 11 is provided in the inner cylinder 10 facing the flow path 60 of the second fluid, which is prone to stagnation (stagnation) as described above, leading to boiling of the second fluid. By providing the high thermal resistance treatment section 11, it is difficult for the heat of the first fluid to be transferred to the surface of the high thermal resistance treatment section 11 on the side of the flow path 60 of the second fluid. Therefore, even if stagnation of the second fluid occurs, it is difficult for the second fluid to boil. In addition, it is also possible to suppress the heat transfer of the first fluid to the area of ​​the inner cylinder 10 located upstream of the heat recovery member 1 when the flow path direction of the first fluid is taken as a reference, so that the heat of the first fluid decreases before being recovered by the heat recovery member 1. As a result, by providing the high thermal resistance treatment section 11, the heat recovery performance is improved.

[0173] It should be explained that Figure 12The example shown is that a high thermal resistance treatment section 11 is formed on both ends of the inner cylinder 10. However, a high thermal resistance treatment section 11 can be formed on one end of the inner cylinder 10.

[0174] In this specification, the high thermal resistance treatment section 11 refers to the portion of the inner cylinder 10 whose thermal resistance is higher than that of the portion excluding the high thermal resistance treatment section 11. Specifically, the thermal resistance of the high thermal resistance treatment section 11 is preferably 0.01 K / W or more, and more preferably 0.02 K / W or more.

[0175] The high thermal resistance treatment section 11 is preferably provided in a portion facing a length region that is less than 50% of the maximum flow path height of the flow path 60 of the second fluid, measured from the end of the flow path of the second fluid. Since the second fluid tends to stagnate in the flow path 60 of the second fluid facing such a region, by providing the high thermal resistance treatment section 11 in this portion, boiling of the second fluid can be stably suppressed.

[0176] There are no particular limitations on the high thermal resistance treated section 11. For example, the thickness of the portion of the inner cylinder 10 that becomes the high thermal resistance treated section 11 can be greater than the thickness of other portions. Alternatively, the portion that becomes the high thermal resistance treated section 11 can be formed of a material with a higher thermal resistance than other portions. Specifically, impurities can be introduced into the portion of the inner cylinder 10 that becomes the high thermal resistance treated section 11, or this portion can be formed of a different material. In addition, the portion of the inner cylinder 10 that becomes the high thermal resistance treated section 11 can be quenched to give it a large number of grain boundaries that are different from other portions. In addition, heat-resistant sheets can be glued to the surface of the portion of the inner cylinder 10 that becomes the high thermal resistance treated section 11, or heat-resistant coatings can be applied. Furthermore, the portion of the inner cylinder 10 that becomes the high thermal resistance treated section 11 can be processed to make it a multi-layered structure.

[0177] In the heat exchanger 600 according to Embodiment 5 of the present invention, as a boiling suppression part, a high thermal resistance treatment part 11 is provided in at least a part of the inner cylinder 10. Therefore, the effect of improving heat recovery performance and suppressing the melting of components constituting the flow path 60 of the second fluid can be improved.

[0178] (Implementation Method 6)

[0179] The heat exchanger according to Embodiment 6 of the present invention differs from the heat exchanger 100 according to Embodiment 1 of the present invention in that: as a boiling suppression part, at least a portion of the inner cylinder 10 has a smoothing part.

[0180] Figure 13 This is a cross-sectional view of the heat exchanger according to Embodiment 6 of the present invention, parallel to the flow direction of the first fluid.

[0181] like Figure 13As shown, the heat exchanger 700 according to Embodiment 6 of the present invention includes: an inner cylinder 10, an outer cylinder 20, a supply pipe 30, and a discharge pipe 40. In addition, the heat exchanger 700 has a smoothed surface portion 12 in at least a portion of the inner cylinder 10.

[0182] It should be noted that the constituent elements having the same symbols as those appearing in the description of the heat exchanger 100 according to Embodiment 1 of the present invention are the same as the constituent elements of the heat exchanger 700 according to Embodiment 6 of the present invention, therefore, their description is omitted.

[0183] As described in Embodiment 1, although it also depends on the shape of the flow path 60 of the second fluid, the flow of the second fluid sometimes slows down around the axial end of the flow path 60. In this case, stagnation (stagnation) of the second fluid is likely to occur around the axial end of the flow path 60, and sometimes the temperature of the second fluid continues to rise, causing the second fluid to boil. If this state occurs, the heat recovery performance is reduced, and the surrounding components (inner cylinder 10 and outer cylinder 20) are prone to melting.

[0184] Therefore, in the heat exchanger 700 of Embodiment 6 of the present invention, a smoothing portion 12 is provided in the inner cylinder 10 facing the flow path 60 of the second fluid, which is prone to stagnation (stagnation) as described above, leading to boiling of the second fluid. The smaller the surface area of ​​the inner cylinder 10, the lower the heat transfer of the inner cylinder 10. Therefore, by providing the smoothing portion 12 in this part, it is difficult for the heat of the first fluid to be transferred to the surface of the smoothing portion 12 on the flow path 60 side of the second fluid. Thus, even if stagnation of the second fluid occurs, it is difficult for the second fluid to boil. In addition, it is also possible to suppress the heat transfer of the first fluid to the area of ​​the inner cylinder 10 located upstream of the heat recovery member 1 when the flow path direction of the first fluid is taken as a reference, so that the heat of the first fluid decreases before being recovered by the heat recovery member 1. As a result, by providing the smoothing portion 12, the heat recovery performance is improved.

[0185] It should be explained that Figure 13 The example shown is that a smoothing portion 12 is formed on both ends of the inner cylinder 10; however, a smoothing portion 12 may be formed on one end of the inner cylinder 10.

[0186] The surface roughness Ra of the smoothed portion 12 is not particularly limited, but is preferably 10 μm or less. By controlling the surface roughness Ra to such a range, the boiling of the second fluid can be stably suppressed.

[0187] In this specification, surface roughness Ra refers to the arithmetic mean roughness measured according to JIS B0601:2013.

[0188] The smoothed portion 12 can be formed on either the inner or outer surface of the inner cylinder 10, preferably on both surfaces. By forming the smoothed portion 12 on both surfaces of the inner cylinder 10, the effect of suppressing the boiling of the second fluid is improved.

[0189] The smoothing section 12 is preferably provided in a portion facing a length region less than 50% of the maximum flow path height of the flow path 60 of the second fluid, measured from the end of the flow path of the second fluid. Since the second fluid tends to stagnate in the flow path 60 of the second fluid facing such a region, by providing the smoothing section 12 in this portion, boiling of the second fluid can be stably suppressed.

[0190] By grinding the portion of the inner cylinder 10 that becomes the smooth surface portion 12, the smooth surface portion 12 can be formed. The grinding conditions and other parameters can be adjusted appropriately according to the type of inner cylinder 10, and there are no particular limitations.

[0191] In the heat exchanger 700 according to Embodiment 6 of the present invention, as a boiling suppression part, at least a portion of the inner cylinder 10 is provided with a smoothing part 12, so that the effect of improving heat recovery performance and suppressing the melting of components constituting the flow path 60 of the second fluid can be improved.

Claims

1. A heat exchanger, wherein, Possessing: a heat recovery member through which a first fluid can flow; an inner tube that houses the heat recovery member; an outer tube that has a supply port through which a second fluid can be supplied and a discharge port through which the second fluid can be discharged, and that is disposed apart from the inner tube in a radial direction to form a flow path of the second fluid between the inner tube and the outer tube; a supply pipe that is connected to the supply port; and a discharge pipe that is connected to the discharge port, in a case where a flow path direction of the first fluid is a reference, the supply port of the outer tube is on a downstream side from an axial center portion of the outer tube, and the discharge port of the outer tube is on an upstream side from the axial center portion of the outer tube, the heat recovery member is disposed such that, in a case where the flow path direction of the first fluid is a reference, an axial center portion of the heat recovery member is on a downstream side from an axial center portion of the flow path of the second fluid, and a downstream end portion of the heat recovery member is on an upstream side from a downstream end portion of the flow path of the second fluid.

2. The heat exchanger according to claim 1, wherein in a case where the flow path direction of the first fluid is a reference, the downstream end portion of the heat recovery member is disposed on an upstream side from the downstream end portion of the flow path of the second fluid by 10 mm or more.

3. The heat exchanger according to claim 1 or 2, wherein in a case where the flow path direction of the first fluid is a reference, the downstream end portion of the heat recovery member is disposed on an upstream side from the downstream end portion of the flow path of the second fluid by 10% or more of a length of the flow path of the second fluid.

4. The heat exchanger according to claim 1, wherein a boiling suppression portion that suppresses boiling of the second fluid is provided in the flow path of the second fluid.

5. The heat exchanger according to claim 4, wherein the boiling suppression portion is one or more selected from a flow path blocking member that is disposed to block at least a portion of the flow path of the second fluid, a flow path blocking processing portion of at least a portion of the outer tube, a reduced diameter structure portion of the supply port, a high thermal resistance processing portion of at least a portion of the inner tube, and a smoothing surface portion of at least a portion of the inner tube.

6. The heat exchanger according to claim 5, wherein the flow path blocking member is disposed to block at least one end portion of the flow path of the second fluid, and to block a length region of 50% or less of a maximum flow path height of the flow path of the second fluid from the end portion of the flow path of the second fluid.

7. The heat exchanger according to claim 6, wherein the flow path blocking member is a ring-shaped member.

8. The heat exchanger according to claim 5, wherein the flow path blocking processing portion is a turn-back structure and / or a bead portion formed on at least one end portion side of the outer tube.

9. The heat exchanger according to claim 5, wherein the reduced diameter structure portion of the supply port is configured such that a diameter of the supply port is 65% to 95% of a diameter of the discharge port.

10. The heat exchanger according to claim 5, wherein ​ The high thermal resistance processing portion is provided in a portion facing a length region of 50% or less of a maximum flow path height of the flow path of the second fluid from an end portion of the flow path of the second fluid.

11. The heat exchanger according to claim 10, wherein The thermal resistance of the high thermal resistance processing portion is 0.01 K / W or more.

12. The heat exchanger according to claim 5, wherein The surface roughness Ra of the smoothed portion is 10 μm or less.

13. The heat exchanger according to claim 12, wherein The smoothed portion is provided in a portion facing a length region of 50% or less of a maximum flow path height of the flow path of the second fluid from an end portion of the flow path of the second fluid.

14. The heat exchanger according to claim 1, wherein The heat recovery member is a honeycomb structure, The honeycomb structure has an outer peripheral wall, and a plurality of partition walls provided inside the outer peripheral wall and dividing a plurality of cells to form the flow path of the first fluid extending from a first end surface to a second end surface; or, the honeycomb structure has an outer peripheral wall, an inner peripheral wall, and a partition wall provided between the outer peripheral wall and the inner peripheral wall and dividing a plurality of cells to form the flow path of the first fluid extending from a first end surface to a second end surface.

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