WO2020056651A1 - Aluminum alloy heat exchanger and preparation method therefor - Google Patents

Aluminum alloy heat exchanger and preparation method therefor Download PDF

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Publication number
WO2020056651A1
WO2020056651A1 PCT/CN2018/106577 CN2018106577W WO2020056651A1 WO 2020056651 A1 WO2020056651 A1 WO 2020056651A1 CN 2018106577 W CN2018106577 W CN 2018106577W WO 2020056651 A1 WO2020056651 A1 WO 2020056651A1
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Prior art keywords
combustion chamber
heat exchanger
aluminum alloy
parts
friction stir
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PCT/CN2018/106577
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French (fr)
Chinese (zh)
Inventor
杨林龙
Original Assignee
苏州明志科技有限公司
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Application filed by 苏州明志科技有限公司 filed Critical 苏州明志科技有限公司
Priority to CN201880044572.6A priority Critical patent/CN111108331A/en
Priority to PCT/CN2018/106577 priority patent/WO2020056651A1/en
Publication of WO2020056651A1 publication Critical patent/WO2020056651A1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
    • B23K20/12—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating the heat being generated by friction; Friction welding
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
    • F24H1/10—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium

Definitions

  • the present invention relates to a heat exchanger, and in particular, to an aluminum alloy heat exchanger and a preparation method thereof.
  • Aluminum alloy heat exchangers are the main components in gas-fired wall-mounted heating furnaces, which are mainly composed of a combustion chamber and a casing, and heat exchange columns are distributed in the cavity of the combustion chamber.
  • the combustion chamber and the casing are connected by reinforcing ribs, during which The hollow cavity forms a water jacket, which is used to provide heating and domestic hot water.
  • the combustion chamber and the casing are an integrated structure, which is integrally formed by a sand casting method.
  • This method has high manufacturing cost, and at the same time, it is impossible to perform anticorrosive treatment on the inner chamber of the combustion chamber.
  • the liquefied gas and natural gas are burned in the inner cavity of the combustion chamber. It will chemically react with the aluminum on the surface of the inner cavity to produce acid gas and oc-Al 2 0 3 , and the increase of oc-Al 2 0 3 will make the liquefied gas And natural gas can not be ignited, thereby reducing the life of the wall-hung boiler.
  • the object of the present invention is to provide an aluminum alloy heat exchanger, which can realize the anticorrosion of the inner cavity of the combustion chamber, make it suitable for application in a gas heating furnace, and extend the service life.
  • Another object of the present invention is to provide a method for preparing an aluminum alloy heat exchanger.
  • An aluminum alloy heat exchanger which includes a combustion chamber and a casing, wherein heat exchange columns are distributed in the combustion chamber, and the combustion chamber is perpendicular to The heat exchange column is divided into two parts, and the two parts of the combustion chamber are fixedly connected by friction stir welding.
  • the inner surface of the combustion chamber is provided with an anticorrosive layer; the shell is sleeved around the combustion chamber and is stirred and frictioned.
  • the welding is fixedly connected with the outer wall of the combustion chamber.
  • each reinforcing rib provided in the casing is fixedly connected to the outer wall of the combustion chamber by friction stir welding; the cavity between the reinforcing ribs constitutes a water flow channel.
  • a method for preparing an aluminum alloy heat exchanger according to the present invention includes the following steps:
  • step (3) (4) combining the shell by friction stir welding with the combustion chamber obtained in step (3) to obtain an aluminum alloy heat exchanger.
  • both the combustion chamber and the casing can be prepared by using existing technologies.
  • the designed combustion chamber structure it can be prepared by a forging method; a die casting method can be used Preparation; Can also be prepared by sand molding method.
  • the combustion chamber is divided into the same two parts.
  • step (1) one half of the prepared combustion chamber is used as two parts respectively to form a combustion chamber.
  • the present invention has the following advantages compared with the prior art:
  • the invention breaks through the limitations of traditional thinking, creatively divides the combustion chamber, and the product is composed of a combination of 3 parts.
  • the structure of the parts is relatively simple, and it can be easily prepared by using existing technologies, saving raw materials.
  • Equipment and manpower on the other hand, because the combustion chamber is separated, the inner cavity is also separated and exposed at the same time, which can conveniently prevent corrosion of the combustion chamber cavity, improve product quality and extend service life.
  • the present invention combines several components into a final heat exchanger based on friction stir welding technology, which has high welding efficiency, is beneficial to the environment, and reduces the health hazard of the operator.
  • FIG. 1 is a schematic structural diagram of a housing in an embodiment of the present invention
  • FIG. 2 is a schematic structural diagram of a combustion chamber in the embodiment
  • FIG. 3 is a schematic structural diagram of a part of a combustion chamber
  • FIG. 4 is a schematic diagram of a combustor manner
  • FIG. 5 is a schematic diagram of a combined heat exchanger.
  • Embodiment 1 An aluminum alloy heat exchanger includes a combustion chamber 3 and a casing 1. As shown in FIG. 1, an inner wall of the casing 1 is provided with reinforcing ribs 2, and a gap between the reinforcing ribs 2 forms a water flow channel; As shown in FIG. 2, a heat exchange column 4 is distributed in the combustion chamber 3, and the combustion chamber 3 is composed of two parts divided along a direction perpendicular to the heat exchange column 4, and the structure of one part is shown in FIG. 3; The inner surface of the combustion chamber is provided with an anti-corrosion layer; as shown in FIG.
  • the method for preparing an aluminum alloy heat exchanger of this embodiment includes the following steps:
  • combustion chamber Since the combustion chamber is divided into the same two parts, only half of the combustion chamber and the casing need to be prepared. It can be manufactured by various existing preparation methods, such as forging, sand molding, and under specific conditions. Next, it can also be made of aluminum alloy profiles;
  • step (3) (4) combining the shell by friction stir welding with the combustion chamber obtained in step (3) to obtain an aluminum alloy heat exchanger.
  • Friction stir welding has high efficiency, and only takes a few seconds for each workpiece. At the same time, no flux or shielding gas is needed, which is beneficial to the environment and greatly reduces the health hazard to the operator.

Abstract

An aluminum alloy heat exchanger, comprising a combustion chamber (3) and a housing (1), heat exchange columns (4) being arranged in the combustion chamber; the combustion chamber consisting of two parts divided perpendicular to the heat exchange columns; the two parts of the combustion chamber being fixedly connected by means of friction stir welding; an anti-corrosion layer being provided on the surface of an inner cavity of the combustion chamber; the housing being sleeved at the periphery of the combustion chamber, and being fixedly connected to an outer wall of the combustion chamber by means of friction stir welding; and a preparation method for the aluminum alloy heat exchanger. The heat exchanger prepared by the preparation method is simple in structure, the combustion chamber is separated, and the inner cavity is separated and exposed. Corrosion resistance can be conveniently performed on the inner cavity of the combustion chamber, the product quality is improved, and the service life is prolonged.

Description

一种铝合金热交换器及其制备方法 技术领域  TECHNICAL FIELD
[0001] 本发明涉及一种热交换器， 具体涉及一种铝合金热交换器及其制备方法。  [0001] The present invention relates to a heat exchanger, and in particular, to an aluminum alloy heat exchanger and a preparation method thereof.
背景技术  Background technique
[0002] 铝合金热交换器是燃气壁挂式采暖炉中的主要部件， 它主要由燃烧室与外壳组 成， 燃烧室内腔中分布有热交换柱， 燃烧室和外壳之间通过加强筋连接， 其间 的空腔形成水套， 作用是提供供暖以及生活热水。  [0002] Aluminum alloy heat exchangers are the main components in gas-fired wall-mounted heating furnaces, which are mainly composed of a combustion chamber and a casing, and heat exchange columns are distributed in the cavity of the combustion chamber. The combustion chamber and the casing are connected by reinforcing ribs, during which The hollow cavity forms a water jacket, which is used to provide heating and domestic hot water.
[0003] 5见有技术中， 燃烧室和外壳是一体结构， 采用砂型铸造方法整体成型制成。 这 种方法制造成本高， 同时， 无法对其燃烧室内腔进行防腐处理。 但是液化气及 天然气是在燃烧室内腔进行燃烧的， 它会与内腔表面的铝发生化学反应， 产生 酸性气体及 oc-Al 20 3, 而 oc-Al 20 3的增多会使液化气及天然气出现不能点燃的现 象， 从而降低壁挂炉的使用寿命。 [0003] In the prior art, the combustion chamber and the casing are an integrated structure, which is integrally formed by a sand casting method. This method has high manufacturing cost, and at the same time, it is impossible to perform anticorrosive treatment on the inner chamber of the combustion chamber. However, the liquefied gas and natural gas are burned in the inner cavity of the combustion chamber. It will chemically react with the aluminum on the surface of the inner cavity to produce acid gas and oc-Al 2 0 3 , and the increase of oc-Al 2 0 3 will make the liquefied gas And natural gas can not be ignited, thereby reducing the life of the wall-hung boiler.
[0004] 因此， 需要对铝合金热交换器的结构和制备方法进行改进， 以解决燃烧室内腔 防腐问题， 延长热交换器的使用寿命。  [0004] Therefore, there is a need to improve the structure and preparation method of the aluminum alloy heat exchanger to solve the problem of corrosion prevention in the interior of the combustion chamber and extend the service life of the heat exchanger.
发明概述  Summary of invention
技术问题  technical problem
问题的解决方案  Problem solution
技术解决方案  Technical solutions
[0005] 本发明的发明目的是提供一种铝合金热交换器， 实现对燃烧室内腔的防腐， 使 其适用于燃气采暖炉中应用， 并延长使用寿命。 本发明的另一发明目的是提供 一种铝合金热交换器的制备方法。  [0005] The object of the present invention is to provide an aluminum alloy heat exchanger, which can realize the anticorrosion of the inner cavity of the combustion chamber, make it suitable for application in a gas heating furnace, and extend the service life. Another object of the present invention is to provide a method for preparing an aluminum alloy heat exchanger.
[0006] 为达到上述发明目的， 本发明采用的技术方案是： 一种铝合金热交换器， 包括 燃烧室和外壳， 所述燃烧室中分布有热交换柱， 所述燃烧室由沿垂直于热交换 柱分割的两个部分组成， 燃烧室的两个部分之间经搅拌摩擦焊固定连接， 燃烧 室的内腔表面设有防腐层； 所述外壳套设在燃烧室外周， 并经搅拌摩擦焊与燃 烧室外壁固定连接。 [0007] 上述技术方案中， 所述外壳内设置的每一加强筋均与所述燃烧室外壁经搅拌摩 擦焊固定连接； 各加强筋之间的空腔构成水流通道。 [0006] In order to achieve the above-mentioned object of the present invention, the technical solution adopted by the present invention is: An aluminum alloy heat exchanger, which includes a combustion chamber and a casing, wherein heat exchange columns are distributed in the combustion chamber, and the combustion chamber is perpendicular to The heat exchange column is divided into two parts, and the two parts of the combustion chamber are fixedly connected by friction stir welding. The inner surface of the combustion chamber is provided with an anticorrosive layer; the shell is sleeved around the combustion chamber and is stirred and frictioned. The welding is fixedly connected with the outer wall of the combustion chamber. [0007] In the above technical solution, each reinforcing rib provided in the casing is fixedly connected to the outer wall of the combustion chamber by friction stir welding; the cavity between the reinforcing ribs constitutes a water flow channel.
[0008] 本发明的铝合金热交换器的制备方法， 包括以下步骤：  [0008] A method for preparing an aluminum alloy heat exchanger according to the present invention includes the following steps:
[0009] (1)分别制备燃烧室的两个部分及外壳；  [0009] (1) preparing two parts of the combustion chamber and the casing, respectively;
[0010] (2)对燃烧室两个部分的热交换柱表面采用微弧氧化法进行处理， 形成表面防 腐层；  [0010] (2) the surface of the heat exchange column of the two parts of the combustion chamber is treated with a micro-arc oxidation method to form a surface anticorrosive layer;
[0011] (3)将燃烧室的两个部分通过搅拌摩擦焊进行组合， 形成固定连接的燃烧室； [0011] (3) combining the two parts of the combustion chamber by friction stir welding to form a fixedly connected combustion chamber;
[0012] (4)将外壳通过搅拌摩擦焊与步骤 (3)得到的燃烧室进行组合， 获得铝合金热交 换器。 [0012] (4) combining the shell by friction stir welding with the combustion chamber obtained in step (3) to obtain an aluminum alloy heat exchanger.
[0013] 上述技术方案中， 由于燃烧室被分成两个部分， 燃烧室和外壳均可以采用现有 技术进行制备， 例如， 根据设计的燃烧室结构， 可以采用煅造方法制备； 可以 采用压铸方法制备； 也可以采用砂型成型方法制备。  [0013] In the above technical solution, since the combustion chamber is divided into two parts, both the combustion chamber and the casing can be prepared by using existing technologies. For example, according to the designed combustion chamber structure, it can be prepared by a forging method; a die casting method can be used Preparation; Can also be prepared by sand molding method.
[0014] 优选的技术方案， 将燃烧室分成相同的两个部分， 步骤 (1)中， 制备的燃烧室的 一半分别作为两个部分用于组合成燃烧室。  [0014] In a preferred technical solution, the combustion chamber is divided into the same two parts. In step (1), one half of the prepared combustion chamber is used as two parts respectively to form a combustion chamber.
发明的有益效果  The beneficial effects of the invention
有益效果  Beneficial effect
[0015] 由于上述技术方案运用， 本发明与现有技术相比具有下列优点：  [0015] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art:
[0016] 本发明突破了传统思维的局限， 创造性地将燃烧室进行分割， 产品由 3个部件 组合构成， 一方面， 部件的结构较为简单， 可以方便地采用现有技术进行制备 ， 节省了原材料、 设备和人力， 另一方面， 由于燃烧室被分离， 内腔同时被分 离外露， 可以方便地对燃烧室内腔进行防腐， 提高了产品质量， 延长了使用寿 命。  [0016] The invention breaks through the limitations of traditional thinking, creatively divides the combustion chamber, and the product is composed of a combination of 3 parts. On the one hand, the structure of the parts is relatively simple, and it can be easily prepared by using existing technologies, saving raw materials. , Equipment and manpower, on the other hand, because the combustion chamber is separated, the inner cavity is also separated and exposed at the same time, which can conveniently prevent corrosion of the combustion chamber cavity, improve product quality and extend service life.
[0017] 同时， 本发明基于搅拌摩擦焊接技术将几个部件组合成最终的热交换器， 焊接 效率高， 同时对环境有利， 降低操作工的健康危害。  [0017] At the same time, the present invention combines several components into a final heat exchanger based on friction stir welding technology, which has high welding efficiency, is beneficial to the environment, and reduces the health hazard of the operator.
对附图的简要说明  Brief description of the drawings
附图说明  BRIEF DESCRIPTION OF THE DRAWINGS
[0018] 图 1是本发明实施例中外壳的结构示意图；  [0018] FIG. 1 is a schematic structural diagram of a housing in an embodiment of the present invention;
[0019] 图 2是实施例中燃烧室的结构示意图； [0020] 图 3是燃烧室的一个部分的结构示意图； [0019] FIG. 2 is a schematic structural diagram of a combustion chamber in the embodiment; [0020] FIG. 3 is a schematic structural diagram of a part of a combustion chamber;
[0021] 图 4是燃烧室组合方式的示意图；  [0021] FIG. 4 is a schematic diagram of a combustor manner;
[0022] 图 5是组合完成的热交换器的示意图。  [0022] FIG. 5 is a schematic diagram of a combined heat exchanger.
[0023] 其中： 1、 外壳； 2、 加强筋； 3、 燃烧室； 4、 热交换柱； 5、 焊接位置。  [0023] Among them: 1. Shell; 2. Reinforcing ribs; 3. Combustion chamber; 4. Heat exchange column; 5. Welding position.
发明实施例  Invention Examples
本发明的实施方式  Embodiments of the invention
[0024] [0008]下面结合附图及实施例对本发明作进一步描述：  [0024] The present invention is further described below with reference to the drawings and embodiments:
[0025] 实施例一： 一种铝合金热交换器， 包括燃烧室 3和外壳 1， 如图 1所示， 外壳 1内 壁上设有加强筋 2, 加强筋 2之间的间隙构成水流通道； 如图 2所示， 所述燃烧室 3中分布有热交换柱 4， 所述燃烧室 3由沿垂直于热交换柱 4分割的两个部分组成 ， 其中一个部分的结构如图 3所示； 燃烧室的内腔表面设有防腐层； 如图 4所示 ， 燃烧室 3的两个部分相对组合， 组合表面之间经搅拌摩擦焊固定连接； 所述外 壳 1套设在燃烧室 3外周， 并经搅拌摩擦焊与燃烧室外壁固定连接， 如图 5所示， 其中， 显示了外壳和燃烧室之间的焊接位置 5。  [0025] Embodiment 1: An aluminum alloy heat exchanger includes a combustion chamber 3 and a casing 1. As shown in FIG. 1, an inner wall of the casing 1 is provided with reinforcing ribs 2, and a gap between the reinforcing ribs 2 forms a water flow channel; As shown in FIG. 2, a heat exchange column 4 is distributed in the combustion chamber 3, and the combustion chamber 3 is composed of two parts divided along a direction perpendicular to the heat exchange column 4, and the structure of one part is shown in FIG. 3; The inner surface of the combustion chamber is provided with an anti-corrosion layer; as shown in FIG. 4, two parts of the combustion chamber 3 are relatively combined, and the combined surfaces are fixedly connected by friction stir welding; The friction stir welding is fixedly connected to the outer wall of the combustion chamber, as shown in FIG. 5, where the welding position 5 between the casing and the combustion chamber is shown.
[0026] 本实施例的铝合金热交换器的制备方法， 包括以下步骤：  [0026] The method for preparing an aluminum alloy heat exchanger of this embodiment includes the following steps:
[0027] (1)由于燃烧室被分割成相同的两个部分， 只需制备燃烧室的一半及外壳， 可 以采用现有的各种制备方法制造， 例如， 煅造、 砂型成型， 在特定条件下， 也 可以采用铝合金型材制造；  [0027] (1) Since the combustion chamber is divided into the same two parts, only half of the combustion chamber and the casing need to be prepared. It can be manufactured by various existing preparation methods, such as forging, sand molding, and under specific conditions. Next, it can also be made of aluminum alloy profiles;
[0028] (2)对燃烧室两个部分组成内腔的表面采用微弧氧化法进行处理， 形成表面防 腐层； 微弧氧化法形成的氧化膜层作为防腐层与燃烧室内腔结合牢固， 具有良 好的耐磨、 耐腐蚀等特性。  [0028] (2) The surface of the internal cavity of the two parts of the combustion chamber is treated by micro-arc oxidation to form a surface anticorrosive layer; the oxide film layer formed by the micro-arc oxidation method is firmly combined with the interior of the combustion chamber as an anticorrosive layer, Good abrasion and corrosion resistance.
[0029] (3)将燃烧室的两个部分通过搅拌摩擦焊进行组合， 形成固定连接的燃烧室； [0029] (3) combining the two parts of the combustion chamber by friction stir welding to form a fixedly connected combustion chamber;
[0030] (4)将外壳通过搅拌摩擦焊与步骤 (3)得到的燃烧室进行组合， 获得铝合金热交 换器。 [0030] (4) combining the shell by friction stir welding with the combustion chamber obtained in step (3) to obtain an aluminum alloy heat exchanger.
[0031] 搅拌摩擦焊效率高， 每个工件只需要几秒， 同时无需焊剂或保护气体， 对环境 有利， 也大大降低了对操作工的健康危害。  [0031] Friction stir welding has high efficiency, and only takes a few seconds for each workpiece. At the same time, no flux or shielding gas is needed, which is beneficial to the environment and greatly reduces the health hazard to the operator.

Claims

权利要求书 [权利要求 1] 一种铝合金热交换器， 包括燃烧室和外壳， 所述燃烧室中分布有热交 换柱， 其特征在于： 所述燃烧室由沿垂直于热交换柱分割的两个部分 组成， 燃烧室的两个部分之间经搅拌摩擦焊固定连接， 燃烧室的内腔 表面设有防腐层； 所述外壳套设在燃烧室外周， 并经搅拌摩擦焊与燃 烧室外壁固定连接。 [权利要求 2] 根据权利要求 1所述的铝合金热交换器， 其特征在于： 所述外壳内设 置的每一加强筋均与所述燃烧室外壁经搅拌摩擦焊固定连接； 各加强 筋之间的空腔构成水流通道。 [权利要求 3] 权利要求 1或 2所述铝合金热交换器的制备方法， 其特征在于， 包括以 下步骤： Claim [Claim 1] An aluminum alloy heat exchanger includes a combustion chamber and a casing, and a heat exchange column is distributed in the combustion chamber, characterized in that the combustion chamber is divided by a section perpendicular to the heat exchange column. It is composed of two parts. The two parts of the combustion chamber are fixedly connected by friction stir welding. The inner surface of the combustion chamber is provided with an anti-corrosion layer. The outer shell is sleeved around the combustion chamber and is connected to the outer wall of the combustion chamber by friction stir welding. Fixed connection. [Claim 2] The aluminum alloy heat exchanger according to claim 1, characterized in that: each reinforcing rib provided in the casing is fixedly connected to the outer wall of the combustion chamber by friction stir welding; The hollow space between them forms a water flow channel. [Claim 3] The method for preparing an aluminum alloy heat exchanger according to claim 1 or 2, further comprising the following steps:
(1)分别制备燃烧室的两个部分及外壳；  (1) Prepare the two parts of the combustion chamber and the shell separately;
(2)对燃烧室两个部分的热交换柱表面采用微弧氧化法进行处理， 形 成表面防腐层；  (2) The surface of the heat exchange column of the two parts of the combustion chamber is treated by a micro-arc oxidation method to form a surface anticorrosive layer;
(3)将燃烧室的两个部分通过搅拌摩擦焊进行组合， 形成固定连接的 燃烧室；  (3) combining the two parts of the combustion chamber by friction stir welding to form a fixedly connected combustion chamber;
(4)将外壳通过搅拌摩擦焊与步骤 (3)得到的燃烧室进行组合， 获得铝 合金热交换器。  (4) Combine the shell by friction stir welding with the combustion chamber obtained in step (3) to obtain an aluminum alloy heat exchanger.
[权利要求 4] 根据权利要求 3所述的铝合金热交换器的制备方法， 其特征在于； 将 燃烧室分成相同的两个部分， 步骤 (1)中， 制备的燃烧室的一半分别 作为两个部分用于组合成燃烧室。  [Claim 4] The method for preparing an aluminum alloy heat exchanger according to claim 3, characterized in that: the combustion chamber is divided into the same two parts, and in step (1), half of the prepared combustion chamber are respectively regarded as two These sections are used to combine into a combustion chamber.
PCT/CN2018/106577 2018-09-19 2018-09-19 Aluminum alloy heat exchanger and preparation method therefor WO2020056651A1 (en)

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