WO2021090526A1 - 二重管式熱交換器の製造方法 - Google Patents

二重管式熱交換器の製造方法 Download PDF

Info

Publication number
WO2021090526A1
WO2021090526A1 PCT/JP2020/019822 JP2020019822W WO2021090526A1 WO 2021090526 A1 WO2021090526 A1 WO 2021090526A1 JP 2020019822 W JP2020019822 W JP 2020019822W WO 2021090526 A1 WO2021090526 A1 WO 2021090526A1
Authority
WO
WIPO (PCT)
Prior art keywords
movable claw
metal
designated section
radial direction
inner pipe
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2020/019822
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
前田　龍一
八木　孝司
森　浩一
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nichirin Co Ltd
Original Assignee
Nichirin Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nichirin Co Ltd filed Critical Nichirin Co Ltd
Priority to EP20885876.1A priority Critical patent/EP4056294B1/en
Priority to CN202080077196.8A priority patent/CN114599463B/zh
Priority to US17/775,156 priority patent/US11534818B2/en
Publication of WO2021090526A1 publication Critical patent/WO2021090526A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D15/00—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies
    • F28D15/02—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes
    • F28D15/0233—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes the conduits having a particular shape, e.g. non-circular cross-section, annular
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, rods, wire, tubes, profiles or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, rods, wire, tubes, profiles or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/15—Making tubes of special shape; Making tube fittings
    • B21C37/151—Making tubes with multiple passages
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, rods, wire, tubes, profiles or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, rods, wire, tubes, profiles or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/15—Making tubes of special shape; Making tube fittings
    • B21C37/20—Making helical or similar guides in or on tubes without removing material, e.g. by drawing same over mandrels, by pushing same through dies ; Making tubes with angled walls, ribbed tubes or tubes with decorated walls
    • B21C37/202—Making helical or similar guides in or on tubes without removing material, e.g. by drawing same over mandrels, by pushing same through dies ; Making tubes with angled walls, ribbed tubes or tubes with decorated walls with guides parallel to the tube axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, rods, wire, tubes, profiles or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, rods, wire, tubes, profiles or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/15—Making tubes of special shape; Making tube fittings
    • B21C37/22—Making finned or ribbed tubes by fixing strip or like material to tubes
    • B21C37/225—Making finned or ribbed tubes by fixing strip or like material to tubes longitudinally-ribbed tubes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D15/00—Corrugating tubes
    • B21D15/02—Corrugating tubes longitudinally
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D53/00—Making other particular articles
    • B21D53/02—Making other particular articles heat exchangers or parts thereof, e.g. radiators, condensers fins, headers
    • B21D53/06—Making other particular articles heat exchangers or parts thereof, e.g. radiators, condensers fins, headers of metal tubes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D53/00—Making other particular articles
    • B21D53/02—Making other particular articles heat exchangers or parts thereof, e.g. radiators, condensers fins, headers
    • B21D53/08—Making other particular articles heat exchangers or parts thereof, e.g. radiators, condensers fins, headers of both metal tubes and sheet metal
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D7/10—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged one within the other, e.g. concentrically
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
    • F28F1/42—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being both outside and inside the tubular element
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D39/00—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders
    • B21D39/04—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders of tubes with tubes; of tubes with rods
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2255/00—Heat exchanger elements made of materials having special features or resulting from particular manufacturing processes

Definitions

  • the present invention relates to a method for manufacturing a double-tube heat exchanger including an outer tube and an inner tube arranged in the outer tube.
  • Patent Document 1 describes a method for manufacturing a double-tube heat exchanger in which an inner tube is arranged inside an outer tube, in which a multi-row concave groove is provided in the longitudinal direction of the surface of the inner tube.
  • This multi-row concave groove is for increasing the heat transfer area and improving the heat exchange efficiency. Then, this groove is formed by rolling using a grooving tool.
  • An object of the present invention is to use an inexpensive manufacturing apparatus to form a corrugated portion in a predetermined range in the axial direction of an inner tube in a short time by increasing the heat transfer area and improving the heat exchange efficiency. It is an object of the present invention to provide a method for manufacturing a double-tube heat exchanger.
  • the method for manufacturing a double-tube heat exchanger according to the present invention is: An outer pipe and an inner pipe arranged inside the outer pipe are provided, and in a cross-sectional view of the inner pipe, an outward protruding portion protruding outward in the radial direction and an inward protruding portion protruding inward in the radial direction.
  • This is a method for manufacturing a double-tube heat exchanger in which a corrugated portion is formed in which the above steps are alternately repeated in the circumferential direction.
  • the inner tube is provided between a movable metal claw that is provided with a convex tip inward in the radial direction, is movable in the radial direction, and has a predetermined length in the axial direction.
  • Mold shape part forming process and It is characterized by having.
  • a core metal having a convex portion in the radial direction and a predetermined length in the axial direction is provided at a position corresponding to the top of the corrugated portion, and corresponds to the bottom of the corrugated portion.
  • a convex tip portion is provided inward in the radial direction, and the inner tube is axially connected to a movable metal claw that is movable in the radial direction and has a predetermined length in the axial direction.
  • An inner tube insertion process that inserts a predetermined length in the direction, A wave that forms the corrugated portion in a predetermined range in the axial direction of the inner tube by pressing the inner tube inward in the radial direction with the metal movable claw and plastically deforming the inner tube. Mold shape part forming process and Therefore, while adopting an inexpensive manufacturing device using the core metal and the metal movable claw, the heat transfer area is increased within a predetermined range in the axial direction of the inner pipe to generate heat. A corrugated portion that improves exchange efficiency can be formed in a short time.
  • the corrugated portion according to the present invention is formed by using the core metal and the metal movable claw, the corrugated portion is formed as compared with the hydraulic method formed by using an expensive high-pressure pump. There is an advantage that the shape of can be formed sharply.
  • (a) is a state before the inner tube is inserted between the core metal and the metal movable claw, and (b) is (a).
  • the state of the AA cross section shown, (c) is an explanatory view for explaining the ridgeline of the convex portion of the tip of the metal movable claw shown in (a), and (d) is the Ib arrow view shown in (c).
  • (a) is a state in which the inner pipe (first designated section 3a) is moved between the core metal and the metal movable claw, and (b) is BB shown in (a).
  • the state of the cross section (c) is the state of the BB cross section in the state where the inner tube is pressed inward in the radial direction with the movable metal claw from the state shown in (a), (d) is the state of (c).
  • 5A is an explanatory diagram for explaining a state in which the movable metal claw is moved outward in the radial direction of the inner tube from the state shown in FIG.
  • (a) is a state in which the inner pipe (second designated section 3b) is moved between the core metal and the metal movable claw
  • (b) is CC shown in (a).
  • the state of the cross section (c) is the state of the CC cross section in the state where the inner tube is pressed inward in the radial direction with the movable metal claw from the state shown in (a), (d) is the state of (c). It is explanatory drawing for demonstrating the state in which the metal movable claw is moved outward in the radial direction of the inner tube from the state which the H part shown in (1) is enlarged, and (e) is the state shown in (c).
  • (a) is a state in which the inner pipe (third designated section 3c) is moved between the core metal and the metal movable claw
  • (b) is DD shown in (a).
  • the state of the cross section is the state of the DD cross section in the state where the inner tube is pressed inward in the radial direction with the movable metal claw from the state shown in (a), (d) is the state of (c). It is explanatory drawing for demonstrating the state in which the metal movable claw is moved outward in the radial direction of the inner tube from the state which the part I shown in (1) is enlarged, and (e) is the state shown in (c).
  • (a) is a state in which both ends of the outer pipe are fixed to the outer peripheral portion in the axial direction in which the corrugated shape portion is not formed, which is close to both ends of the predetermined range of the length L of the inner pipe.
  • b) is an explanatory diagram for explaining the state of the EE cross section shown in (a)
  • (c) is an explanatory diagram for explaining the state of the FF cross section shown in (a).
  • (a) is an explanatory view for explaining a convex portion at the tip of the metal movable claw in a side view of the metal movable claw
  • (b). ) Is a view taken along the line VIb shown in (a)
  • (c) is an explanatory view for explaining the state of the VIc-VIc cross section shown in (a)
  • (d) is the state of the VId-VId cross section shown in (a). It is explanatory drawing for demonstrating.
  • (a) is an explanatory view for explaining the convex tip of the metal movable claw in the side view of the metal movable claw, (b). ) Is a view taken along the line VIIb shown in (a).
  • (a) is an explanatory view for explaining the convex tip of the metal movable claw in the side view of the metal movable claw, (b). ) Is a view taken along the line VIIIb shown in (a).
  • FIG. 1A and 1B show a method of manufacturing a double-tube heat exchanger according to the present embodiment, in which FIG. 1A is a state before an inner tube is inserted between a core metal and a metal movable claw, and FIG.
  • the state of the AA cross section shown in (a) is an explanatory view for explaining the ridgeline of the convex portion of the tip of the metal movable claw shown in (a), and (d) is shown in (c). It is an Ib arrow view.
  • 1 is a core metal having a predetermined length X in the axial direction represented schematically (details will be described later), and 2 is movable in the radially represented radial direction.
  • 3 is an inner tube (for example, an inner tube having an outer diameter of ⁇ 19).
  • L is the length of a predetermined range in the axial direction of the inner pipe 3 on which the corrugated shape portion 3h (see FIG. 2 below) is formed (for example, about 160 mm), and 3a is a designated section within the predetermined range.
  • the first designated section, 3b is the second designated section as the designated section within the predetermined range
  • 3c is the third designated section as the designated section within the predetermined range.
  • the adjacent first designated section 3a and the second designated section 3b overlap each other.
  • the adjacent second designated section 3b and the third designated section 3c overlap each other.
  • the core metal 1 may be supported from one side, for example.
  • the core metal 1 has eight convex portions 1a provided in the circumferential direction and at equal intervals.
  • the eight convex portions 1a extend in the axial direction of the core metal 1 (not shown).
  • the metal movable claw 2 can be separated into eight metal movable claw pieces 2A divided into eight equal parts in the circumferential direction.
  • the metal movable claw 2 has eight convex tip portions 2a provided in the circumferential direction and at equal intervals.
  • One tip convex portion 2a is formed on one metal movable claw piece 2A.
  • the eight convex tip portions 2a extend in the axial direction of the metal movable claw 2 (see FIG. 1 (d)).
  • the tip convex portion 2a of the metal movable claw 2 is arranged so as to be located between the convex portion 1a of the core metal 1 and the adjacent convex portion 1a in the circumferential direction. Further, the convex portion 1a of the core metal 1 is provided at a position corresponding to the top portion 3i (see FIG. 2 (e) below) of the corrugated portion 3h toward the outer side in the radial direction. Further, the convex tip portion 2a of the metal movable claw 2 is provided inward in the radial direction at a position corresponding to the bottom portion 3j (see FIG. 2 (e) below) of the corrugated shape portion 3h. There is.
  • the material of the core metal 1 for example, die steel or the like can be used.
  • the material of the metal movable claw 2 for example, die steel or the like can be used.
  • the material of the inner tube 3 for example, pure aluminum, aluminum alloy, pure copper, copper alloy, stainless steel and the like can be used.
  • the ridge line 2b extending in the axial direction of the convex tip portion 2a of the metal movable claw 2 is slightly inclined with respect to the axial direction.
  • the slope ⁇ h of the ridge line 2b is omitted.
  • the convex tip portion 2a extends in the axial direction of the metal movable claw 2 (the left-right direction in FIG. 1D).
  • the other tip convex portion 2a also has the same configuration as the tip convex portion 2a shown in FIGS. 1 (c) and 1 (d).
  • the inner tube inserting step is a step of inserting the inner tube 3 into a predetermined length in the axial direction between the core metal 1 and the metal movable claw 2 (for example, first the first step). This is a step of moving the designated section 3a of 1 between the core metal 1 and the metal movable claw 2).
  • FIG. 2B is an explanatory diagram for explaining the state of the BB cross section shown in FIG. 2A.
  • the inner tube 3 is pressed inward in the radial direction with the movable metal claw 2, and the inner tube 3 is plastically deformed to bring the length L of the inner tube 3 into a predetermined range.
  • This is a step of forming the corrugated shape portion 3h.
  • a metal movable claw 2 having an axial length of Y presses the first designated section 3a of the inner pipe 3 inward in the radial direction (for example, by flood control).
  • the corrugated shape portion 3h (3a) is formed in the first designated section 3a.
  • FIG. 2D is an explanatory diagram for explaining an enlarged state of the G portion shown in FIG. 2C.
  • the corrugated shape portion 3h (3a) has an outward protruding portion 3f protruding outward in the radial direction and an inward radial portion in the cross-sectional view of the inner pipe 3. It can be seen that the inwardly projecting portions 3g protruding inward are repeatedly formed alternately in the circumferential direction.
  • FIG. 3A As shown in FIG. 3A, after the movable claw moving step 1, the next designated section (second designated section 3b) within a predetermined range of the length L of the inner pipe 3 and the designated section wave type The second designated section 3b is moved between the core metal 1 and the metal movable claw 2 so that an axial overlap with the first designated section 3a in the shape portion forming step 1 occurs.
  • FIG. 3B is an explanatory diagram for explaining the state of the CC cross section shown in FIG. 3A.
  • FIG. 3D is an explanatory diagram for explaining an enlarged state of the H portion shown in FIG. 3C.
  • the corrugated shape portion 3h (3b) has an outward protruding portion 3f protruding outward in the radial direction and an inward radial portion in the cross-sectional view of the inner pipe 3. It can be seen that the inwardly projecting portions 3g protruding inward are repeatedly formed alternately in the circumferential direction.
  • FIG. 4A After the movable claw moving step 2, the next designated section (third designated section 3c) within a predetermined range of the length L of the inner pipe 3 and the designated section wave type The third designated section 3c is moved between the core metal 1 and the metal movable claw 2 so that an axial overlap with the second designated section 3b in the shape portion forming step 2 occurs.
  • FIG. 4B is an explanatory diagram for explaining the state of the DD cross section shown in FIG. 4A.
  • a metal movable claw 2 having an axial length of Y presses the third designated section 3c of the inner tube 3 inward in the radial direction, and the inner tube 3 is pressed.
  • the corrugated shape portion 3h (3c) is formed in the third designated section 3c.
  • FIG. 4D is an explanatory diagram for explaining an enlarged state of part I shown in FIG. 4C.
  • the corrugated shape portion 3h (3c) has an outward protruding portion 3f protruding outward in the radial direction and an inward radial portion in the cross-sectional view of the inner pipe 3. It can be seen that the inwardly projecting portions 3g protruding inward are repeatedly formed alternately in the circumferential direction.
  • the corrugated shape portion 3h is continuously formed in the entire predetermined range of the length L of the inner pipe 3.
  • the core has the above-mentioned "inner tube insertion step” and “corrugated shape portion forming step”. While adopting an inexpensive manufacturing device using gold 1 and a metal movable claw 2, the heat transfer area is increased within a predetermined range of the axial length L of the inner tube 3 to improve heat exchange efficiency.
  • the corrugated shape portion 3h to be made can be formed. Further, since the inner pipe 3 obtained by the method according to the present embodiment is manufactured by the above-mentioned method, there is an advantage that a long processing time unlike the method using rolling is not required.
  • the following (1) to (3) are performed until the corrugated shape portion 3h is formed in the entire predetermined range of the length L of the inner pipe 3 in the above-mentioned "corrugated shape portion forming step". )
  • the process is continuously repeated in this order.
  • a metal movable claw 2 having a designated length Y whose length Y in the axial direction is shorter than the length L of the predetermined range of the inner tube 3, and a designated section (for example, 3a) within the predetermined range of the inner tube 3.
  • a movable claw moving step of moving a metal movable claw 2 having a specified length Y outward in the radial direction of the inner tube 3 (3)
  • the inner tube 3 The next designated section (for example, 3b) is set so that an axial overlap occurs between the next designated section (for example, 3b) within the predetermined range and the designated section (for example, 3a) in the step (1).
  • Inner pipe moving step of moving between the core metal 1 and the metal movable claw 2 As a result, the corrugated shape portion 3h is axially uninterrupted within a predetermined range of the length L of the inner pipe 3. It is formed continuously.
  • the portion where the axial overlap occurs is the previous designated section wave shape portion forming step and the next designated section wave.
  • the mold shape forming step it is pressed by the metal movable claw 2. That is, the overlapped portion is pressed twice by the metal movable claw 2.
  • a protruding portion ⁇ which looks like a dent (not shown) when viewed from the outer surface of the inner pipe 3 ⁇ is formed in the portion where the overlap occurs inward in the radial direction.
  • the above-mentioned protrusion is formed in the overlapping portion between the first designated section 3a and the second designated section 3b and the overlapping portion between the second designated section 3b and the third designated section 3c. From this protruding portion, it can be seen that the corrugated shape portion 3h of the inner tube 3 is formed by the method of the present embodiment and is not formed by another method (for example, rolling).
  • the ridge line 2b of the tip convex portion 2a of the metal movable claw 2 is on the side where the inner tube 3 is inserted (on the right side in FIG. 1 (c)). It is tilted ⁇ h.
  • the protruding portion becomes easier to understand in the overlapping portion between the first designated section 3a and the second designated section 3b and the overlapping portion between the second designated section 3b and the third designated section 3c.
  • the corrugated shape portion 3h of the inner tube 3 is formed by the method of the present embodiment and is not formed by another method (for example, rolling).
  • the core metal 1 has eight even-numbered convex portions 1a provided in the circumferential direction and at equal intervals
  • the metal movable claw 2 has a circumferential. It has eight even-numbered convex tip portions 2a provided in the direction and at equal intervals.
  • FIGS. 2 (b) and 2 (c) in the core metal 1, the two convex portions 1a formed on opposite sides in the radial direction with respect to the axis are radially outward. In addition, they protrude toward the opposite sides of each other.
  • the outer pipe 4 (for example, the outer diameter of the raw pipe is ⁇ 22), and then both ends 4a and 4b are tightened in the radial direction, and then brazed or welded to fix the pipe. Expanded pipe portions 4c and 4d are formed in close proximity to both end portions 4a and 4b of the outer pipe 4.
  • the material of the outer tube 4 for example, pure aluminum, aluminum alloy, pure copper, copper alloy, stainless steel and the like can be used as in the case of the inner tube 3.
  • FIG. 5B is an explanatory diagram for explaining the state of the EE cross section shown in FIG. 5A.
  • the manufacturing method according to the present invention is adopted, as described above, there are outer peripheral portions on both ends of the inner pipe 3 in which the corrugated shape portion 3h is not formed (that is, the raw pipe remains as it is). Therefore, when fixing both end portions 4a and 4b of the outer pipe 4 to the inner pipe 3, it is not necessary to take any special treatment for the inner pipe 3, which is an effect peculiar to the present invention.
  • the structure of the inner pipe 3 according to the present invention that is, a portion in which the corrugated shape portion 3h is selectively formed and a portion in which the corrugated shape portion 3h is not formed as a raw tube coexist. Structure
  • Structure is a structure that cannot be obtained with extruded materials.
  • FIG. 5 (c) is an explanatory diagram for explaining the state of the FF cross section shown in FIG. 5 (a).
  • the second aspect of the present invention is concerned.
  • the bendability of the heavy pipe is also high (that is, the double pipe is not crushed by bending and the cross-sectional shape is stable).
  • the corrugated shape portion 3h is not necessarily limited to the combination of the eight outward protrusions 3f and the eight inward protrusions 3g, and is "high in heat exchange efficiency" and "small in pressure loss". It suffices to satisfy the customer in a well-balanced manner according to the customer's request.
  • both end portions 4a and 4b of the outer pipe 4 are provided on the outer peripheral portion where the corrugated portion 3h of the inner pipe 3 is not formed.
  • the outer pipe fixing process of fixing by brazing or welding after tightening in the radial direction has been described, but it is also possible to increase the number of places where the inner pipe 3 and the outer pipe 4 are fixed if necessary.
  • the outer pipe is fixed by the first method of press-fitting the inner pipe 3 into the outer pipe 4, or by inserting the inner pipe 3 into the outer pipe 4 and then crimping from the outside of the outer pipe 4 to the inner pipe 3.
  • a second method of fixing the outer pipe 4 is also possible (in the second method, the crimping location may extend over the entire length of the corrugated shape portion 3h formed, or may be several locations. It may be).
  • the metal movable claw piece 102A has a tip convex portion 102a and a tip protruding portion 102p that further protrudes outward in the radial direction from the tip convex portion 102a. Is formed.
  • the tip protruding portion 102p is formed in the tip convex portion 102a near the center in the axial direction (near the center in the left-right direction of FIGS. 6A and 6B).
  • the tip convex portion 102a and the tip protrusion 102p extend in the axial direction of the metal movable claw 102 as shown in FIGS. 6 (a) and 6 (b).
  • the ridge line 102b extending in the axial direction of the tip convex portion 102a is slightly inclined with respect to the axial direction.
  • the ridge line 102b of the tip convex portion 102a is inclined by ⁇ h toward the side where the inner pipe 3 is inserted (to the right side in FIG. 6A).
  • the ridge line 102q extending in the axial direction of the tip protruding portion 102p is slightly inclined with respect to the axial direction.
  • the ridge line 102q of the tip protruding portion 102p is inclined by ⁇ h 1 toward the side where the inner pipe 3 is inserted (on the right side in FIG. 6A).
  • All eight metal movable claw pieces constituting the metal movable claw 102 of the modified example 1 are the metal movable claw pieces 102A shown in FIGS. 6 (a) to 6 (d). Of the eight metal movable claw pieces constituting the metal movable claw 102 of the first modification, at least one metal movable claw piece is made of metal shown in FIGS. 6 (a) to 6 (d). The movable claw piece 102A may be used. Further, as the metal movable claw piece other than the metal movable claw piece 102A, for example, the metal movable claw piece 2A shown in FIGS. 1B to 1D may be used.
  • the metal movable claw 102 of the modified example 1 is used in all the steps from the designated section corrugated shape portion forming step 1 to the designated section corrugated shape portion forming step 3. In one or two steps of the designated section corrugated shape portion forming step 1 to the designated section corrugated shape portion forming step 3, the metal movable claw 102 of the modified example 1 is used, and in the remaining steps. , The metal movable claw 2 of the above-described embodiment (see FIG. 1B) may be used.
  • a portion of the metal movable claw 102 facing the tip protruding portion 102p see FIG. 6A.
  • a core metal having a concave portion formed inward in the radial direction can be used.
  • the portion of the inner pipe pressed by the tip protruding portion 102p is further projected inward in the radial direction of the corrugated portion 3h.
  • a portion ⁇ looks like a dent (not shown) when viewed from the outer surface of the inner tube 3 ⁇ is formed.
  • the ridge line 102b of the tip convex portion 102a is slightly inclined with respect to the axial direction, but the ridge line 102b of the tip convex portion 102a is slightly inclined with respect to the axial direction. It may be parallel.
  • the ridge line 102q of the tip protruding portion 102p is slightly inclined with respect to the axial direction, but the ridge line 102q of the tip protruding portion 102p may be parallel to the axial direction. ..
  • the portion of the metal movable claw 102 facing the tip protruding portion 102p is radially inward.
  • a core metal having a further recessed recess has been described.
  • a core metal may be used in which the portion of the metal movable claw 102 facing the tip protruding portion 102p is not formed with a further recessed recess in the radial direction.
  • the core metal 1 used in the above embodiment may be used.
  • a protruding portion further protruding inward in the radial direction of the corrugated portion 3h is formed in the portion pressed by the tip protruding portion 102p of the metal movable claw 102. Will be done.
  • FIG. 7 (a) and 7 (b) show the metal movable claw piece 202A of the metal movable claw 202 of the second modification.
  • the tip convex portion 202a is formed on the metal movable claw piece 202A.
  • the tip convex portion 202a extends in an inclined direction with respect to the axial direction of the metal movable claw 202 (the left-right direction in FIG. 7B).
  • the ridge line 202b of the tip convex portion 202a is slightly inclined with respect to the axial direction.
  • the ridge line 202b is inclined by ⁇ h toward the side where the inner pipe 3 is inserted (to the right side in FIG. 7A).
  • the ridge line 202b of the tip convex portion 202a may be parallel to the axial direction.
  • the other metal movable claw piece 202A constituting the metal movable claw 202 and the other tip convex portion 202a of the metal movable claw 202 are shown in FIGS. 7 (a) and 7 (b). It has the same configuration as the metal movable claw piece 202A and the tip convex portion 202a.
  • the core metal has eight convex portions 1a provided in the circumferential direction and at equal intervals.
  • the eight convex portions 1a extend in an inclined direction with respect to the axial direction of the core metal (not shown).
  • the eight convex portions 1a extend in the same direction as the convex tip portion 202a of the metal movable claw 202 shown in FIG. 7 (b).
  • the metal movable claw 202 is made of metal so that the convex tip portion 202a extending in the diagonal direction faces the concave portion 1b extending in the diagonal direction of the core metal.
  • the formula claw 202 is arranged.
  • the first designated section 3a, the second designated section 3b, and the third designated section 3c of the inner pipe 3 can be formed.
  • a corrugated portion extending in an inclined direction with respect to the axial direction can be formed.
  • a continuous spiral corrugated portion can be formed in the first designated section 3a and the second designated section 3b without interruption.
  • the core metal is rotated about a shaft (core metal rotation step 1).
  • the second designated section 3b is movable with a core metal and metal so that an axial overlap occurs between the next second designated section 3b and the first designated section 3a.
  • the portion on which the extending corrugated shape portion is formed is aligned with the eight convex portions 1a extending in the diagonal direction of the core metal, which are rotated in the core metal rotation step 1.
  • the designated section corrugated shape portion forming step 2 is carried out.
  • a continuous spiral corrugated portion is formed in the first designated section 3a and the second designated section 3b.
  • Either the core metal rotation step 1 or the inner pipe moving step 1 may be performed first.
  • the core metal rotation step 1 and the inner pipe moving step 1 may be performed at the same time.
  • a continuous spiral corrugated portion can be formed in the second designated section 3b and the third designated section 3c without interruption.
  • the core metal is rotated about the axis (core metal rotation step 2).
  • the third designated section 3c is movable with a core metal and metal so that an axial overlap occurs between the next third designated section 3c and the second designated section 3b.
  • the portion on which the extending corrugated shape portion is formed is aligned with the eight convex portions 1a extending in the diagonal direction of the core metal, which are rotated in the core metal rotation step 2.
  • the designated section corrugated shape portion forming step 3 is carried out.
  • a continuous spiral wavy portion is formed in the second designated section 3b and the third designated section 3c.
  • Either the core metal rotation step 2 or the inner pipe moving step 2 may be performed first.
  • the core metal rotation step 2 and the inner pipe moving step 2 may be performed at the same time.
  • the spiral corrugated portion is continuously formed in the entire predetermined range of the length L of the inner pipe 3 without interruption.
  • a double-tube heat exchanger having a corrugated shape portion that further increases the heat transfer area and further improves the heat exchange efficiency can be obtained.
  • the above modification 2 can be changed as in the following modification 3, for example.
  • Modification example 3 a modified example (modified example 3) of the modified example 2 of the present invention will be described.
  • the difference between the modified example 3 and the modified example 2 is the configuration of the metal movable claw.
  • the same reference numerals are used, and the description thereof will be omitted as appropriate.
  • the metal movable claw piece 302A is formed with a tip convex portion 302a and a tip projecting portion 302p that further protrudes outward in the radial direction from the tip convex portion 302a.
  • the tip protruding portion 302p is formed in the tip convex portion 302a near the center in the axial direction (left-right direction in FIGS. 8A and 8B).
  • the tip convex portion 302a and the tip protrusion 302p extend in an inclined direction with respect to the axial direction of the metal movable claw 302.
  • the ridge line 302b of the tip convex portion 302a is slightly inclined with respect to the axial direction.
  • the ridge line 302b is inclined by ⁇ h toward the side where the inner pipe 3 is inserted (to the right side in FIG. 8A).
  • the ridge line 302q of the tip protruding portion 302p is slightly inclined with respect to the axial direction.
  • the ridge line 302q is inclined by ⁇ h 2 toward the side where the inner pipe 3 is inserted (to the right side in FIG. 8A).
  • the ridge line 302b of the tip convex portion 302a may be parallel to the axial direction.
  • the ridge line 302q of the tip protruding portion 302p may be parallel to the axial direction.
  • All eight metal movable claw pieces constituting the metal movable claw 302 of the modified example 3 are the metal movable claw pieces 302A shown in FIGS. 8 (a) and 8 (b). Of the eight metal movable claw pieces constituting the metal movable claw 302 of the modified example 3, at least one metal movable claw piece is shown in FIGS. 8 (a) and 8 (b). A metal movable claw piece 302A may be used. Further, as the metal movable claw piece other than the metal movable claw piece 302A, for example, the metal movable claw piece 202A shown in FIGS. 7 (a) and 7 (b) may be used.
  • the metal movable claw 102 of the modified example 1 is used in all the steps from the designated section corrugated shape portion forming step 1 to the designated section corrugated shape portion forming step 3. In one or two steps of the designated section corrugated shape portion forming step 1 to the designated section corrugated shape portion forming step 3, the metal movable claw 302 of the modified example 3 is used, and in the remaining steps. , The metal movable claw 202 of the above-mentioned modification 2 (see FIGS. 7 (a) and 7 (b)) may be used.
  • the core metal for example, in the recess 1b of the core metal used in the second modification (see FIG. 1B), the portion of the metal movable claw 302 facing the tip protruding portion 302p (see FIG. 8A).
  • a core metal having a concave portion formed inward in the radial direction can be used.
  • a corrugated portion extending in an inclined direction with respect to the axial direction can be formed in the inner pipe, and the tip protruding portion 302p presses the inner pipe.
  • a protruding portion (which looks like a dent (not shown) when viewed from the outer surface of the inner pipe 3) is formed in the portion of the corrugated portion inward in the radial direction.
  • the ridge line 302b of the tip convex portion 302a is slightly inclined with respect to the axial direction, but the ridge line 302b of the tip convex portion 302a is slightly inclined with respect to the axial direction. It may be parallel.
  • the ridge line 302q of the tip protruding portion 302p is slightly inclined with respect to the axial direction, but the ridge line 302q of the tip protruding portion 302p may be parallel to the axial direction. Good.
  • the portion of the metal movable claw 302 facing the tip protruding portion 302p is radially inward.
  • a core metal having a further recessed recess has been described.
  • a core metal may be used in which the portion of the metal movable claw 302 facing the tip protruding portion 302p is not formed with a further recessed recess in the radial direction.
  • the core metal used in the above modification 2 may be used.
  • the corrugated portion 3h further protrudes inward in the radial direction at the portion pressed by the tip protruding portion 302p of the metal movable claw 302 in the inner pipe.
  • a protruding portion is formed.
  • the corrugated shape portion 3h may be formed by dividing it into two or four times or more.
  • the ridge line 2b of the tip convex portion 2a of the metal movable claw 2 is inclined by ⁇ h with respect to the axial direction.
  • the ridge line 2b of the convex tip portion 2a of the metal movable claw 2 may be parallel to the axial direction.
  • the ridge line 2b of the tip convex portion 2a of the metal movable claw 2 is on the side where the inner tube 3 is inserted (on the side of FIG. 1 (c)). On the right side), there is an inclination amount of ⁇ h. However, even if the ridge line 2b of the tip convex portion 2a of the metal movable claw 2 has an inclination amount of ⁇ h on the side opposite to the side where the inner pipe 3 is inserted (the left side in FIG. 1C). Good.
  • the metal movable claw 2 also protrudes in the overlapping portion between the first designated section 3a and the second designated section 3b and the overlapping portion between the second designated section 3b and the third designated section 3c.
  • the part ⁇ looks like a dent (not shown) when viewed from the outer surface of the inner tube 3 ⁇ becomes easier to understand. Thereby, it is easier to understand that the corrugated portion of the inner tube is formed by the method of the present embodiment and is not formed by another method (for example, rolling).
  • the ridge line 102b (see FIG. 6A) of the convex tip portion 102a of the metal movable claw 102 is on the side opposite to the side into which the inner tube 3 is inserted (FIG. 6A).
  • the left side of may have an inclination amount of ⁇ h.
  • Modification 1 the end projecting portion ridge 102p 102q (see FIG. 6 (a)), on the side opposite the inner tube 3 is inserted (left side in FIG. 6 (a)), the amount of tilt Delta] h 1 You may have.
  • the ridge line 202b (see FIG.
  • the convex tip portion 202a of the metal movable claw 202 is on the side opposite to the side into which the inner tube 3 is inserted (FIG. 7A).
  • the left side of) may have an inclination amount of ⁇ h.
  • the ridge line 302b (see FIG. 8A) of the convex tip portion 302a of the metal movable claw 302 is on the side opposite to the side into which the inner tube 3 is inserted (FIG. 8A).
  • the left side of) may have an inclination amount of ⁇ h.
  • the ridge line 302q (see FIG. 8A) of the tip protruding portion 302p has an inclination amount of ⁇ h 2 on the side opposite to the side where the inner pipe 3 is inserted (the left side of FIG. 8A). You may have.
  • the corrugated shape portions 3h are formed at regular intervals in the axial direction, but the present invention is not necessarily limited to this.
  • the corrugated shape portions 3h may be formed at irregular intervals in the axial direction.
  • the inner pipe 3 may be moved so as to correspond to the unequal intervals.
  • the corrugated shape portion 3h is formed in a predetermined range of the length L of the inner pipe 3 in three times, but the present invention is not necessarily limited to this. It is not something that is done.
  • a "metal movable claw 2" having an axial length for forming the corrugated portion 3h in a predetermined range at one time and a corresponding "core metal 1" are prepared. All you have to do is do it.
  • a core metal 1 having eight convex portions 1a and a metal movable claw 2 having eight tip convex portions 2a are used.
  • a metal movable claw 2 having a core metal 1 having any number of four or six convex portions 1a and a tip convex portion 2a having the same number of convex portions 1a It is also possible to adopt.
  • An even number of convex portions 1a are provided on the core metal 1 in the circumferential direction and at equal intervals, and the same number of convex portions 2a as the number of convex portions 1a are provided on the metal movable claw 2 in the circumferential direction.
  • the core metal 1 is provided at equal intervals, for example, as shown in FIGS. 2 (b) and 2 (c)
  • the core metal 1 is formed on opposite sides in the radial direction with respect to the axis.
  • the two convex portions 1a project outward in the radial direction toward opposite sides.
  • two tip convex portions 2a arranged on opposite sides in the radial direction about the axis project inward in the radial direction toward the opposite sides.
  • the inner tube 3 when the inner tube 3 is pressed inward in the radial direction with the movable metal claw 2, the inner tube 3 has two convex tip portions arranged on opposite sides in the radial direction about the axis. 2a presses them inward in the radial direction from opposite sides. Therefore, the cross-sectional shape of the inner pipe 3 is maintained in a substantially circular shape while forming the corrugated shape portion 3h in the inner pipe 3. From the above, it is possible to manufacture a substantially cylindrical inner tube 3 in which the corrugated shape portion 3h is formed. Also in the modified examples 1 to 3, the number of convex portions of the core metal and the number of convex portions at the tip of the metal movable claw are not limited. In the modified examples 1 to 3, similarly to the above, it is possible to adopt a core metal having an even number of convex portions and a metal movable claw having the same number of convex portions at the tip as the number of convex portions. It is possible.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Geometry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
PCT/JP2020/019822 2018-11-21 2020-05-19 二重管式熱交換器の製造方法 Ceased WO2021090526A1 (ja)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP20885876.1A EP4056294B1 (en) 2018-11-21 2020-05-19 Method for manufacturing double-pipe heat exchanger
CN202080077196.8A CN114599463B (zh) 2018-11-21 2020-05-19 双重管式热交换器的制造方法
US17/775,156 US11534818B2 (en) 2018-11-21 2020-05-19 Method for manufacturing double-pipe heat exchanger

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2018218334 2018-11-21
JP2019-202543 2019-11-07
JP2019202543A JP6844791B2 (ja) 2018-11-21 2019-11-07 二重管式熱交換器の製造方法

Publications (1)

Publication Number Publication Date
WO2021090526A1 true WO2021090526A1 (ja) 2021-05-14

Family

ID=70905443

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2020/019822 Ceased WO2021090526A1 (ja) 2018-11-21 2020-05-19 二重管式熱交換器の製造方法

Country Status (5)

Country Link
US (1) US11534818B2 (https=)
EP (1) EP4056294B1 (https=)
JP (1) JP6844791B2 (https=)
CN (1) CN114599463B (https=)
WO (1) WO2021090526A1 (https=)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN119281894A (zh) * 2024-11-19 2025-01-10 中铁上海设计院集团有限公司 一种圆形竖波纹钢管的制作方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4834663B1 (https=) * 1968-06-26 1973-10-23
JPS6376715A (ja) * 1986-09-17 1988-04-07 Masuda Seisakusho:Kk 金属管の螺旋模様成形方法
JP2005144459A (ja) * 2003-11-11 2005-06-09 Matsumoto Jukogyo Kk 熱交換器用の異形伝熱管の製造方法
JP4628858B2 (ja) 2005-05-09 2011-02-09 株式会社デンソー 二重管の製造方法、およびその装置
WO2012000490A2 (de) * 2010-06-27 2012-01-05 Technische Universität Dortmund Verfahren und vorrichtung zur inkrementellen umformung von profilrohren, insbesondere von profilrohren mit über die längsachse variierenden querschnitten

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005052973B4 (de) 2004-11-09 2014-11-20 Denso Corporation Doppelwandiges Rohr und Herstellungsverfahren dafür
CN102712031B (zh) * 2010-12-20 2016-03-30 株式会社广岛技术 金属制管、金属制管的加工方法及加工装置
JP6172950B2 (ja) * 2012-02-01 2017-08-02 株式会社Uacj 熱交換器用二重管
WO2014054117A1 (ja) * 2012-10-02 2014-04-10 三菱電機株式会社 二重管式熱交換器および冷凍サイクル装置
JP6573210B2 (ja) * 2014-11-25 2019-09-11 株式会社ノーリツ 二重管式熱交換器及びこれを備えたヒートポンプ式熱源機
JP6574630B2 (ja) * 2015-07-24 2019-09-11 株式会社ケーヒン・サーマル・テクノロジー 二重管式熱交換器
JP2019132509A (ja) * 2018-01-31 2019-08-08 株式会社デンソー 二重管式熱交換器

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4834663B1 (https=) * 1968-06-26 1973-10-23
JPS6376715A (ja) * 1986-09-17 1988-04-07 Masuda Seisakusho:Kk 金属管の螺旋模様成形方法
JP2005144459A (ja) * 2003-11-11 2005-06-09 Matsumoto Jukogyo Kk 熱交換器用の異形伝熱管の製造方法
JP4628858B2 (ja) 2005-05-09 2011-02-09 株式会社デンソー 二重管の製造方法、およびその装置
WO2012000490A2 (de) * 2010-06-27 2012-01-05 Technische Universität Dortmund Verfahren und vorrichtung zur inkrementellen umformung von profilrohren, insbesondere von profilrohren mit über die längsachse variierenden querschnitten

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP4056294A4

Also Published As

Publication number Publication date
US20220347737A1 (en) 2022-11-03
US11534818B2 (en) 2022-12-27
CN114599463A (zh) 2022-06-07
CN114599463B (zh) 2023-04-14
EP4056294A1 (en) 2022-09-14
JP2020082192A (ja) 2020-06-04
EP4056294B1 (en) 2023-12-20
JP6844791B2 (ja) 2021-03-17
EP4056294A4 (en) 2022-12-28

Similar Documents

Publication Publication Date Title
US10982796B2 (en) Dual pipe
CN106794506B (zh) 制造涡轮机构件环支撑件的方法
CN110953915A (zh) 换热器及其制造方法
CN105939797A (zh) 热交换器的制造方法以及扩径治具
JP6844791B2 (ja) 二重管式熱交換器の製造方法
WO2019146569A1 (ja) 金属製丸パイプ、これを備えた熱交換器、パイプベンダおよび金属製丸パイプの曲げ加工方法
JP2010214404A (ja) 熱交換器の製造方法及びその熱交換器を用いた空気調和機
JP2002213889A (ja) 蛇行フィン式熱交換器に用いる改良された管
JP2018183787A (ja) 鋼管の製造方法
JP2019081186A (ja) 熱交換器および熱交換器の製造方法
JP2006317046A (ja) 伝熱管
JP3349128B2 (ja) 渦巻形ガスケットの補強リング及びその製造方法
JP6513501B2 (ja) ワッシャの製造方法及びワッシャ
JP7258840B2 (ja) 二重管及び二重管の製造方法
JPWO2016117364A1 (ja) 機械部品の製造方法及び機械部品
JP5661012B2 (ja) 捩り管形熱交換器および捩り管形熱交換器の製造方法
JPH086846B2 (ja) 管材に対する嵌合部材の嵌合固着方法
JP2020082192A5 (https=)
US20060230801A1 (en) Tube bend
JP2756605B2 (ja) 熱交換器の製造方法
JP2005207710A (ja) フィン付き伝熱管
US11779994B2 (en) Heat exchanger and manufacturing method therefor
JP2016032827A (ja) 熱交換器用異形伝熱管の製造方法
JP7734960B2 (ja) 二重管式熱交換器の製造方法
JP4383535B2 (ja) 鋼管接続具

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 20885876

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

ENP Entry into the national phase

Ref document number: 2020885876

Country of ref document: EP

Effective date: 20220607