WO2021129785A1 - 用于液体加热装置的内管及液体加热装置、制造方法 - Google Patents

用于液体加热装置的内管及液体加热装置、制造方法 Download PDF

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Publication number
WO2021129785A1
WO2021129785A1 PCT/CN2020/139249 CN2020139249W WO2021129785A1 WO 2021129785 A1 WO2021129785 A1 WO 2021129785A1 CN 2020139249 W CN2020139249 W CN 2020139249W WO 2021129785 A1 WO2021129785 A1 WO 2021129785A1
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Prior art keywords
tube
liquid
peripheral wall
inner tube
heating device
Prior art date
Application number
PCT/CN2020/139249
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English (en)
French (fr)
Inventor
杜少玲
Original Assignee
佛山市海德精工电子科技有限公司
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Publication date
Application filed by 佛山市海德精工电子科技有限公司 filed Critical 佛山市海德精工电子科技有限公司
Priority to EP20904950.1A priority Critical patent/EP4080132A4/en
Publication of WO2021129785A1 publication Critical patent/WO2021129785A1/zh
Priority to US17/808,558 priority patent/US20220316757A1/en

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    • 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
    • F24H1/08—Packaged or self-contained boilers, i.e. water heaters with control devices and pump in a single unit
    • 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
    • F24H1/101—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 using electric energy supply
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
    • A47J31/00—Apparatus for making beverages
    • A47J31/44—Parts or details or accessories of beverage-making apparatus
    • A47J31/54—Water boiling vessels in beverage making machines
    • A47J31/542—Continuous-flow heaters
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
    • A47J31/00—Apparatus for making beverages
    • A47J31/44—Parts or details or accessories of beverage-making apparatus
    • A47J31/54—Water boiling vessels in beverage making machines
    • A47J31/56—Water boiling vessels in beverage making machines having water-level controls; having temperature controls
    • 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
    • B21D15/04—Corrugating tubes transversely, e.g. helically
    • B21D15/10—Corrugating tubes transversely, e.g. helically by applying fluid pressure
    • 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
    • B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
    • B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
    • B21D26/033—Deforming tubular bodies
    • 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
    • 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
    • F24H1/12—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 in which the water is kept separate from the heating medium
    • F24H1/121—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 in which the water is kept separate from the heating medium using electric energy supply
    • 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
    • F24H15/00—Control of fluid heaters
    • F24H15/10—Control of fluid heaters characterised by the purpose of the control
    • F24H15/174—Supplying heated water with desired temperature or desired range of temperature
    • 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
    • F24H15/00—Control of fluid heaters
    • F24H15/20—Control of fluid heaters characterised by control inputs
    • F24H15/212—Temperature of the water
    • F24H15/219—Temperature of the water after heating
    • 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
    • F24H15/00—Control of fluid heaters
    • F24H15/30—Control of fluid heaters characterised by control outputs; characterised by the components to be controlled
    • F24H15/335—Control of pumps, e.g. on-off control
    • F24H15/34—Control of the speed of pumps
    • 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
    • F24H15/00—Control of fluid heaters
    • F24H15/30—Control of fluid heaters characterised by control outputs; characterised by the components to be controlled
    • F24H15/355—Control of heat-generating means in heaters
    • F24H15/37—Control of heat-generating means in heaters of electric heaters
    • 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
    • F24H9/00—Details
    • F24H9/0005—Details for water heaters
    • F24H9/001—Guiding means
    • F24H9/0015—Guiding means in water channels
    • 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
    • F24H9/00—Details
    • F24H9/0005—Details for water heaters
    • F24H9/001—Guiding means
    • F24H9/0015—Guiding means in water channels
    • F24H9/0021—Sleeves surrounding heating elements or heating pipes, e.g. pipes filled with heat transfer fluid, for guiding heated liquid
    • 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
    • F24H9/00—Details
    • F24H9/02—Casings; Cover lids; Ornamental panels
    • 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
    • F24H9/00—Details
    • F24H9/18—Arrangement or mounting of grates or heating means
    • F24H9/1809—Arrangement or mounting of grates or heating means for water heaters
    • F24H9/1818—Arrangement or mounting of electric heating means
    • 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
    • F24H9/00—Details
    • F24H9/20—Arrangement or mounting of control or safety devices
    • F24H9/2007—Arrangement or mounting of control or safety devices for water heaters
    • F24H9/2014—Arrangement or mounting of control or safety devices for water heaters using electrical energy supply
    • F24H9/2028—Continuous-flow heaters
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B1/00—Details of electric heating devices
    • H05B1/02—Automatic switching arrangements specially adapted to apparatus ; Control of heating devices
    • H05B1/0227—Applications
    • H05B1/0252—Domestic applications
    • H05B1/0258—For cooking
    • H05B1/0269—For heating of fluids
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/40—Heating elements having the shape of rods or tubes
    • H05B3/42—Heating elements having the shape of rods or tubes non-flexible
    • H05B3/46—Heating elements having the shape of rods or tubes non-flexible heating conductor mounted on insulating base
    • 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
    • F24H1/12—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 in which the water is kept separate from the heating medium
    • F24H1/14—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 in which the water is kept separate from the heating medium by tubes, e.g. bent in serpentine form
    • F24H1/16—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 in which the water is kept separate from the heating medium by tubes, e.g. bent in serpentine form helically or spirally coiled
    • F24H1/162—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 in which the water is kept separate from the heating medium by tubes, e.g. bent in serpentine form helically or spirally coiled using electrical energy supply
    • 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
    • F24H2250/00—Electrical heat generating means
    • F24H2250/02—Resistances
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
    • H05B2203/013—Heaters using resistive films or coatings
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
    • H05B2203/021—Heaters specially adapted for heating liquids

Definitions

  • the present invention relates to the technical field of thick film heating, in particular to an inner tube and a liquid heating device used in a liquid heating device, and a manufacturing method, such as a heating device of an instant water dispenser, an instant coffee machine and other equipment.
  • Components that continuously heat liquids are generally used in heating appliances that require continuous hot water, such as heating devices in coffee makers, beverage heaters, and heating steam generators.
  • heating appliances generally include an inner tube that provides a liquid flow channel and an outer heating tube for heating.
  • a thick film circuit is printed on the outer wall of the outer heating tube. When the thick film circuit is energized to generate heat, the Liquid heating.
  • the liquid flow path is usually an inner tube with a guide mechanism added, and the two are manufactured separately and then fixed.
  • materials such as plastic and rubber are used. Due to their elasticity, plastic and rubber can make the gap between the liquid flow channel and the outer heating tube very small, so that the liquid can only flow from the liquid inlet to the liquid inlet along the flow defined by the liquid flow channel. Liquid outlet to improve heating performance.
  • the temperature of the liquid flow channel will reach 300°C or more during heating, the plastic and rubber materials are prone to produce peculiar smells.
  • the production process of food-grade rubber is complicated and costly. When the rubber meets water in a high temperature and high pressure environment, it will be affected by the temperature.
  • liquid flow channel is usually sealed by a sealing ring, and the sealing ring is prone to ageing, deforming and losing the sealing effect in a high-temperature environment for a long time. Liquid is easy to flow onto the heated thick film circuit, which poses a safety hazard.
  • the purpose of the present invention is to provide an inner tube for a liquid heating device, a heating device, and a manufacturing method thereof.
  • the combined design of the tube and the outer tube with heating components enhances the high temperature and high pressure resistance of the heating device and ensures the safety of the heated liquid.
  • An inner tube for a liquid heating device comprising a hollow tube body made of metal or alloy, and the tube wall thickness of the tube body is 0.3 to 1.0 mm;
  • the pipe body is axially processed into a spiral guide structure on the inner peripheral wall of the pipe body, so that the spiral guide structure is formed to extend along the axial direction of the pipe body and protrude on the outer peripheral wall of the pipe body.
  • it also includes a flaring provided at both ends of the tube body integrally formed with the tube body.
  • a first through hole penetrating the tube wall of the tube body is provided at the initial position of the spiral flow guiding structure, so that the first through hole communicates with the tube.
  • the inner peripheral wall and the outer peripheral wall of the body the first through hole is connected with the inner peripheral wall of the tube to form a flow channel entrance; at the end position of the spiral guide structure, a second through hole penetrating the tube wall is provided , So that the second through hole communicates with the inner peripheral wall and the outer peripheral wall of the pipe body, and the connection between the second through hole and the inner peripheral wall of the pipe body forms a flow channel outlet.
  • the spiral flow guiding structure protruding on the outer peripheral wall of the tube has a surface height of 1 to 5 mm, and a thread pitch of 5 to 20 mm.
  • a liquid heating device including:
  • the outer tube, the inner peripheral wall of the outer tube and the highest point of the spiral flow guiding structure are separated by a predetermined radial gap, so that the outer tube is sleeved on the outside of the spiral flow guiding structure; Heating components are provided on the outer peripheral wall;
  • the inner tube, the outer tube and the spiral flow guiding structure form a flow channel, and the openings at both ends of the flow channel are sealed by a sealing cover; the sealing cover is provided with a first through hole or a second through hole, and the liquid passes through the sealing cover.
  • the first through hole enters the flow channel for heating, and is discharged through the second through hole.
  • a liquid heating device including:
  • the outer tube, the inner peripheral wall of the outer tube and the highest point of the spiral flow guiding structure are separated by a predetermined radial gap, so that the outer tube is sleeved on the outside of the spiral flow guiding structure; Heating components are provided on the outer peripheral wall;
  • the inner tube, the outer tube and the spiral flow guiding structure form a flow channel, and the openings at both ends of the flow channel are sealed by the flaring.
  • the inlet of the flow channel is provided with a liquid inlet tube;
  • the outlet of the flow channel is provided with a liquid outlet tube, and the liquid inlet tube or the liquid outlet tube is opened to both ends of the inner tube from the first through hole or the second through hole It extends in the direction and is exposed at the openings at both ends of the inner tube.
  • the flaring is welded and sealed with the end of the outer tube; the liquid inlet pipe or the liquid outlet pipe is welded to the first through hole or the second through hole.
  • liquid inlet pipe is connected with a water pump, and the diameter of the liquid outlet pipe is not greater than the diameter of the liquid inlet pipe, and the pressure of the liquid in the flow channel is maintained at 0.1-1.0 MPa.
  • the inner tube and the flaring are made of stainless steel materials.
  • the temperature sensor also includes a temperature sensor, and a controller electrically connected to the temperature sensor; the temperature sensor is disposed at a position of the outer tube close to the second through hole, and the controller is used for The temperature information sent by the temperature sensor controls the feeding speed of the water pump and/or the heating power of the heating component.
  • a method for preparing a liquid heating device includes the following steps:
  • the present invention has the following beneficial effects:
  • the invention provides an inner tube for a liquid heating device, a liquid heating device and a manufacturing method thereof.
  • the inner tube is made of metal or alloy material, and the spiral guide is formed by rolling or pressing the inner tube wall.
  • the flow structure and the outer tube form a stable liquid flow channel, and the inner tube and the spiral diversion structure are integrally formed, which avoids the aging, unsafe and easy to occur when the diversion structure is added to the inner tube wall in the traditional heating device. Problems such as falling off are easy for mass production, save materials, reduce manufacturing costs, and improve the long-term stability of the liquid heating device to withstand high temperature and high pressure environments.
  • Figure 1 is a schematic structural diagram of Embodiment 1 provided by the present invention.
  • Embodiment 2 is a schematic diagram of the structure of Embodiment 2 provided by the present invention.
  • Embodiment 3 is a schematic structural diagram of Embodiment 3 provided by the present invention.
  • Embodiment 4 is a schematic diagram of the structure of Embodiment 3 provided by the present invention.
  • Figure 5 is a cross-sectional view of Embodiment 3 provided by the present invention.
  • inner tube 11, spiral guide structure; 12, flow channel; 13, flaring; 14, second through hole; 15, first through hole; 16, liquid outlet pipe; 17, liquid inlet Tube; 18.
  • Tube body 20. Outer tube; 21. Heating component; 22. Heating circuit; 23. Temperature sensor; 24. Electrode; 30. End cover; 31. Bump; 40. Sealing cover; 41. Sealing surface ; 42, the liquid outlet; 43, the liquid inlet.
  • connection should be understood in a broad sense.
  • they can be fixedly connected or detachably connected. Or integrally connected; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or a connection between two components.
  • connection should be understood in a broad sense.
  • they can be fixedly connected or detachably connected. Or integrally connected; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or a connection between two components.
  • the present invention provides an inner tube 10 for a liquid heating device, which specifically includes a hollow tube body 18 made of metal or alloy.
  • the inner tube 10 It is made of stainless steel, such as 304 stainless steel.
  • the spiral guide structure 11 is formed by processing the outer peripheral wall of the inner tube 10 along the axial direction of the tube body 18 by a mold or a stainless steel tube, so that it extends along the axial direction of the tube body 18 and is formed on the outer peripheral wall of the tube body 18
  • the protrusion forms a spiral protrusion, and the corresponding position on the inner peripheral wall surface of the inner tube 10 is a recess.
  • the inner tube 10 is manufactured separately from the diversion structure and then fixed, which is prone to shaking, unstable and falling off.
  • Changing the cross-sectional area of the flow channel 12 affects the liquid or Effluent. While ensuring the flow of water through the flow channel 12, the volume required by the inner tube 10 and the spiral guide structure 11 is reduced, thereby reducing the diameter of the outer tube 20 that is compatible with the inner tube 10, and is suitable for small size Liquid heating device.
  • the inner peripheral wall of the inner tube 10 has threads with an axial cross-sectional shape of a triangle, a trapezoid, a rectangle or a circle. The bottom side of the triangle or trapezoid is arranged on the outer peripheral wall of the pipe body 18, so that the flow channel 12 formed in this way has a simple structure, is easy to generate, and has a more stable diversion performance.
  • the tube wall thickness of the tube body 18 is 0.3-1.0 mm; the surface height of the spiral guide structure 11 is 1-5 mm, and the thread pitch on the surface of the inner tube 10 is 5-20 mm.
  • the surface height of the spiral guide structure 11 is 1.8 mm, and the thread pitch is 6 mm, which is used in conjunction with the outer tube 20 sleeved outside the inner tube 10 in the liquid heating device.
  • the present invention also provides a liquid heating device, which includes the inner tube 10 described in Embodiment 1, the openings at both ends of the inner tube 10 are sealed by end caps 30 made of metal materials; the outer tube 20, There is a predetermined radial gap between the inner peripheral wall of the outer tube 20 and the highest point of the spiral guide structure 11, so that the outer tube 20 is sleeved on the outside of the spiral guide structure 11;
  • a heating assembly 21 is provided on the outer peripheral wall of 20;
  • the inner tube 10, the outer tube 20, and the spiral guide structure 11 form a flow channel 12, and the openings at both ends of the flow channel 12 are sealed by a sealing cover 40;
  • the sealing cover 40 is provided with a liquid inlet 43 or a liquid outlet 42, the liquid enters the flow channel 12 through the liquid inlet 43 of the sealing cap 40 and is heated, and is discharged through the liquid outlet 42.
  • Both ends of the inner tube 10 are respectively sleeved with end caps 30.
  • the end cap 30 includes an end cap surface connected to the end cap wall.
  • the end cap wall and the outer peripheral wall of the inner tube 10 are sealed by welding. fixed.
  • the two ends of the flow channel 12 are sealed by a sealing cover 40 which includes a sealing wall and a sealing surface 41 connected with the sealing wall.
  • the sealing wall and the outer peripheral wall of the outer tube 20 are sealed and fixed by welding.
  • the sealing surface 41 is provided with a liquid inlet 43 and a liquid outlet 42. The liquid to be heated enters the spiral guide structure 11 from the liquid inlet 43 and the flow channel 12 formed by the outer peripheral wall of the inner tube 10 and the inner peripheral wall of the outer tube 20.
  • the heating assembly 21 integrated on the outer peripheral wall of the outer tube 20 will heat the flowing liquid.
  • the heat generated by the heating assembly 21 passes through the outer tube 20 and exchanges heat with the liquid in the flow channel 12 to realize continuous heating of the liquid.
  • the end cap 30 and the sealing cap 40 are used to seal the inner tube 10 and the outer tube 20 respectively, and the sealing structures of the inner tube 10 and the outer tube 20 are processed independently, which is easy to manufacture and has a good sealing effect, which improves the liquid heating device. Long-term stable performance under high temperature and high pressure environment.
  • the end cap 30, the sealing cap 40, the inner tube 10, and the outer tube 20 are all made of stainless steel, which facilitates the firm welding between them.
  • the end cap 30 is provided with a protrusion 31 for fixing the position of the inner tube 10, and the orthographic projection of the protrusion 31 does not coincide with the orthographic projection of the liquid inlet 43 or the liquid outlet 42.
  • the number of bumps 31 can be set according to actual conditions. In this embodiment, the number of bumps 31 is preferably two, which are respectively located on both sides of the liquid inlet 43 or the liquid outlet 42 to ensure uniform installation force. Since the inner tube 10 needs to be sleeved inside the outer tube 20 and the sealing cover 40, the height of the protrusion 31 is less than or equal to the distance between the upper end cover 30 and the upper sealing cover 40 or the lower end cover 30 and the lower sealing cover 40, preventing The sealing cover 40 and the outer tube 20 cannot be sealed.
  • the cross-sectional shape of the bump 31 may be a triangle, a trapezoid, a rectangle, or a semi-ellipse. Fix the bottom of the triangle, trapezoid or plate ellipse to the surface of the end cap 30, without too much contact with the sealing cap 40, blocking the regular flow of water.
  • the radial clearance between the inner peripheral wall of the outer tube 20 and the highest point of the spiral guide structure 11 is within the preset value range, which facilitates the easy sleeve of the inner tube 10 into the outer tube 20, and avoids the radial clearance. Too large causes the liquid to flow directly through the radial gap along the length of the inner tube 10 to the liquid outlet 42 without diversion along the flow channel 12 on the outer peripheral wall of the inner tube 10, resulting in local liquid in the flow channel 12 It stagnates and is continuously heated by the heating element 21, causing local overheating. As a result, the stagnant liquid will vaporize and discharge steam, which in turn causes the discharge of the liquid outlet 42 to be discontinuous and mixed with a large number of bubbles to be discharged. .
  • the embodiment provided by the present invention has been proved by a large number of experiments that when the radial gap is set in the range of 0.1-0.6mm, the liquid can be fully heated, the heating effect is good, and the liquid can be prevented from overheating while ensuring the liquid The flow is smooth, avoiding large bubbles.
  • the present invention also provides another liquid heating device, including the inner tube 10 as described in Embodiment 1, and the outer tube 20.
  • the inner peripheral wall of the outer tube 20 and the spiral There is a predetermined radial gap between the highest points of the guide structure 11 so that the outer tube 20 is sleeved on the outside of the spiral guide structure 11; the outer peripheral wall of the outer tube 20 is provided with a heating assembly 21;
  • the inner tube 10, the outer tube 20 and the spiral flow guiding structure 11 form a flow channel 12.
  • the difference from Embodiment 2 is that the openings at the two ends of the flow channel 12 are sealed by the flaring 13 provided at the two ends of the pipe body 18.
  • the openings at both ends of the inner tube 10 are respectively provided with flarings 13 which extend from the outer peripheral wall of the tube body 18 in a direction away from the opening.
  • the flaring 13 and the outer peripheral wall of the tube body 18 can be integrally formed by welding or a mold. .
  • the flaring 13 and the tube body 18 are integrally formed by mold manufacturing, with good sealing performance and stable structure, and will not fall off after being heated at high temperature for a long time. First sleeve the inner tube 10 into the outer tube 20, keep the inner tube 10 and the outer tube 20 flush at both ends, and then weld and fix the flaring 13 at both ends of the inner tube 10 with the inner peripheral wall of the outer tube 20 to realize the flow channel 12 Seal.
  • Both the tube body 18 and the flaring 13 are made of 304 stainless steel, which is corrosion-resistant, heat-resistant and has good mechanical properties, good processing performance at room temperature, and resistance to corrosion by food processing media.
  • the liquid directly contacts the inner tube 10, and the 304 stainless steel material is not easy to rust and is harmless to the human body. Under long-term high-temperature and high-pressure conditions, avoid materials such as plastics, rubbers, etc., due to heat aging, bubbling, blocking the flow channel 12, and more importantly, avoid the peculiar smell and decomposing toxic substances generated by long-term heating of plastics and rubbers.
  • the liquid is heated quickly, which improves the safety of the heating liquid and the service life of the liquid heating device.
  • the inner tube 10 for the liquefaction heat device provided by the present application has low manufacturing cost, meets food hygiene, and can pass the salt spray test. However, it is not limited and can only use stainless steel materials, and the use of aluminum alloy or titanium alloy materials is also within the protection scope of the present invention.
  • a first through hole 15 penetrating the tube wall of the tube body 18 is provided at the initial position of the spiral guide structure 11, so that the first through hole 15 is connected
  • the inner peripheral wall and outer peripheral wall of the pipe body 18, the first through hole 15 and the inner peripheral wall of the pipe body 18 form the inlet of the flow channel 12; the end position of the spiral guide structure 11 is provided with a penetrating through
  • the second through hole 14 of the pipe wall of the pipe body 18 allows the second through hole 14 to communicate with the inner peripheral wall and the outer peripheral wall of the pipe body 18, and the second through hole 14 is formed at the junction of the inner peripheral wall of the pipe body 18 Runner 12 exit.
  • both ends of the inner tube 10 and the outer tube 20 are sealed by the flaring 13, it is necessary to provide the inner tube 10 or the outer tube 20 with a flow channel 12 inlet or a flow channel 12 outlet, and the flow channel 12 entrance or the flow channel 12 exit A liquid inlet pipe 17 and a liquid outlet pipe 16 adapted to it are provided. If the inlet of the flow channel 12 or the outlet of the flow channel 12 is arranged on the outer peripheral wall of the outer tube 20, the liquid inlet tube 17 or the liquid outlet tube 16 needs to be arranged on the outer surface of the liquid heating device, which will result in the volume of the liquid heating device. Increased and cannot be directly applied to existing shells.
  • the inlet of the flow channel 12 or the outlet of the flow channel 12 are arranged at the starting position and the ending position of the spiral guide structure 11, which communicate with the inner peripheral wall and the outer peripheral wall of the tube body 18, and connect with the inner tube 10 There is a certain distance at the end, so that the liquid can fill the flow channel 12 and be fully heated.
  • the liquid inlet tube 17 or the liquid outlet tube 16 is located on the inner peripheral wall of the inner tube 10, extends from the liquid inlet 43 or the liquid outlet 42 to the opening direction of the two ends of the inner tube 10, and is exposed at the openings at both ends of the inner tube 10.
  • the liquid inlet pipe 17 or the liquid outlet pipe 16 is arranged inside the inner pipe 10, which does not increase the volume of the liquid heating device, and can be directly applied to the existing housing, which is convenient for processing and manufacturing.
  • the inlet of the liquid inlet pipe 17 or the outlet of the liquid outlet pipe 16 has a certain angle with the inlet of the flow channel 12 or the outlet of the flow channel 12 to prevent the liquid from being unable to fill the flow channel 12, resulting in insufficient heating.
  • the liquid to be heated After the liquid to be heated enters the flow channel 12 formed by the inner tube 10, the spiral guide structure 11, and the inner peripheral wall of the outer tube 20 through the first through hole 15 through the liquid inlet tube 17, the liquid to be heated flows along the flow channel 12 at the same time ,
  • the heating component 21 integrated on the outer peripheral wall of the outer tube 20 will heat the flowing liquid.
  • the heat generated by the heating assembly 21 passes through the outer tube 20 and exchanges heat with the liquid in the flow channel 12 to realize continuous heating of the liquid. After the liquid fills the flow channel 12 and is heated, it is discharged from the second through hole 14 through the liquid outlet pipe 16.
  • a water pump (not shown in the figure) is arranged at the inlet of the liquid inlet pipe 17 to continuously deliver pressurized liquid into the flow channel 12, and the diameter of the second through hole 14 is smaller than that of the first through hole 15 to maintain The liquid pressure in the flow channel 12 between the liquid inlet pipe 17 and the liquid outlet pipe 16 is maintained at 0.1-1.0 MPa.
  • the outer peripheral wall on the outer tube 20 is provided with a heating assembly 21.
  • the heating assembly 21 includes an insulating dielectric layer arranged on the outer peripheral wall of the outer tube 20 and a heating circuit 22 arranged on the outer peripheral wall of the outer tube 20.
  • the insulating dielectric layer is printed and burnt on the outer peripheral wall of the outer tube 20, and the heat generated by the heating circuit 22 is used for The liquid flowing in the flow channel 12 is subjected to heat exchange.
  • the heating circuit 22 includes a plurality of heating resistors and electrodes 24 fixed on an insulating dielectric layer, and the extending direction of each heating resistor is consistent with the length direction of the outer tube 20. The two ends of the heating resistor are electrically connected to the electrodes 24, so that a power source is connected to the electrodes 24 for the heating resistor to generate heat.
  • the liquid heating device also includes a temperature sensor 23, and a controller electrically connected to the temperature sensor 23 (for example, a PCB board is used for control in this embodiment), and the temperature sensor 23 is disposed at a position of the outer tube 20 close to the liquid outlet 42 .
  • a controller electrically connected to the temperature sensor 23 (for example, a PCB board is used for control in this embodiment)
  • the temperature sensor 23 is disposed at a position of the outer tube 20 close to the liquid outlet 42 .
  • the first through hole 15 is opened on the inner tube 10 in this embodiment, and the temperature sensor 23 is as close to the second through hole 14 as possible, and can be arranged on the outer tube 20 closest to the second through hole 14. In the radial position.
  • the temperature sensor 23 can approximately detect the liquid temperature of the second through hole 14 by detecting the temperature of the barrel wall of the outer tube 20 close to the second through hole 14.
  • the PCB board controls the water pump according to the temperature information sent by the first temperature sensor 23.
  • the temperature sensor 23 is arranged close to the liquid outlet 42 and at the same time as far away from the heating resistor as possible, so as to accurately detect the temperature of the liquid in the liquid outlet 42. In this way, the temperature sensor 23 is used to detect the temperature of the liquid and feed it back to the PCB board.
  • the PCB board compares the measured liquid temperature data with the user-set temperature required for liquid to automatically adjust the heating power of the heating resistor. Or by controlling the water pump to adjust the flow rate of the liquid entering the flow channel 12, so as to achieve accurate control of the temperature of the outlet liquid.
  • a plurality of heating resistors are arranged around the outer peripheral wall of the outer tube 20, preferably approximately uniformly distributed, so that the heating resistors are directly facing the liquid in the flow channel 12 to flow
  • the liquid transfers heat in time.
  • the present invention also provides a method for preparing a liquid heating device.
  • the preparation of the above-mentioned liquid heating device includes the following steps:
  • the preset parameters include the wall thickness of the inner tube 10, the height of the flaring 13, and the spiral guide The height and spacing of the flow structure 11; the wall thickness of the inner tube 10 is 0.3-1.0 mm, the surface height of the outer peripheral wall of the inner tube 10 of the spiral flow guiding structure 11 is 1-5 mm, and the thread pitch is 5-20 mm.
  • stainless steel 304 is selected, which is corrosion-resistant, heat-resistant, has good mechanical properties, and has good processing performance at room temperature, and can resist corrosion by food and processing media.
  • the liquid heating device is prepared by this method.
  • the inner tube 10 made of stainless steel is used.
  • the spiral diversion structure 11 is formed by the inner tube 10 in the tube body 18 through the mold, avoiding the traditional heating device to add a diversion structure.
  • the problems of aging, unsafe and easy to fall off from the inner tube 10 can reduce the manufacturing cost, no need to perform multiple processing, and the cost is low.
  • the two ends of the inner tube 10 are provided with flared openings 13, and the inner tube 10 and the outer tube 20 are welded through the flaring 13 to realize the sealing of the flow channel 12, and the formed liquid heating device is simple to assemble and has a good sealing effect. It meets the requirements of batch industrial production and improves the stability of the liquid heating device to withstand high temperature and high pressure for a long time.

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Abstract

一种用于液体加热装置的内管（10），包括由金属或者合金制成的呈中空状的管体（18），所述管体的管壁厚度为0.3～1.0mm；通过滚或压的加工方法沿管体轴向在所述管体的内周壁上加工出螺旋状导流结构（11），使得螺旋状导流结构（11）形成为沿管体的轴向延伸，并在管体外周壁上凸起，而在内周壁上凹陷。一种液体加热装置及制造方法，包括上述的内管（10）及外管（20），外管（20）内周壁与螺旋状导流结构（11）最高点之间相隔预定的径向间隙，使外管（20）套设在螺旋状导流结构（11）的外部；外管（20）的外周壁上设有加热组件（21）；内管（10）、外管（20）和螺旋状导流结构（11）形成流道（12），流道（12）两端的开口由所述扩口（13）密封。通过内管（10）、螺旋状导流结构（11）、外管（20）的结合设计，增强了耐高温高压性能，保证加热液体的安全。

Description

用于液体加热装置的内管及液体加热装置、制造方法 技术领域
本发明涉及厚膜加热技术领域，尤其涉及用于液体加热装置的内管及液体加热装置、制造方法，如即热式饮水机、即热式咖啡机等设备的加热装置。
背景技术
对液体连续加热的组件一般应用于需要连续出热水的加热电器中，比如咖啡机、饮料加热器、加热蒸汽机中的加热装置。现有技术中此类加热电器一般包括提供液体流道的内管与进行加热的外加热管，外加热管外壁印制厚膜电路，当厚膜电路通电发热时，实现对通过内管液体流道的液体加热。
现有技术提供的液体加热装置，其液体流道通常为在内管上增设导流机构，两者分开制造再固定。一般采用塑料、橡胶等材料，塑料和橡胶由于具有一定的弹性，可以使得液体流道与外加热管之间的缝隙很小，从而使得液体只能沿着液体流道限定的流程从液体进口流到液体出口，以提高加热性能。但是，由于加热时，液体流道的温度会达到300℃以上，塑料、橡胶材质容易产生异味，食品级橡胶生产工艺复杂、成本高，且橡胶在高温高气压环境中遇水时，会因为温度过高而老化，产生异味，甚至产生有害人体健康的物质。同时，长期高温加热容易使得导流机构将容易出现的晃动、不稳定而导致脱落的情况，阻塞流道，导致出水量变小甚至不出水。
另外液体流道的密封通常采用密封圈的方式，而密封圈长期处于高温环境中亦容易老化、变形失去密封作用。液体容易流到加热的厚膜电路上，存在安全隐患。
发明内容
为了克服现有技术的不足，本发明的目的在于提供用于液体加热装置的内管及其加热装置、制造方法，通过滚或压的方式在内管壁加工形成的螺旋状导流结构、内管、带加热组件的外管的结合设计，增强了加热装置的耐高温高压性能，保证加热液体的安全。
本发明的目的之一采用如下技术方案实现：
一种用于液体加热装置的内管，包括由金属或者合金制成的呈中空状的管体，所述管体的管壁厚度为0.3～1.0mm；通过滚或压的加工方法沿所述管体轴向在所述管体的内周壁上加工出螺旋状导流结构，使得所述螺旋状导流结构形成为沿所述管体的轴向延伸，并在所述管体外周壁上凸起，而在所述内周壁上凹陷。
进一步地，还包括设置在所述管体两端的与所述管体一体成型的扩口。
进一步地，在所述管体内周壁上，位于所述螺旋状导流结构的起始位置设有贯穿所述管体管壁的第一通孔，从而使得所述第一通孔连通所述管体的内周壁和外周壁，所述第一通孔与管体内周壁连接处形成流道入口；位于所述螺旋状导流结构的终止位置设有贯穿所述管体管壁的第二通孔，从而使得所述第二通孔连通所述管体的内周壁和外周壁，所述第二通孔与管体内周壁连接处形成流道出口。
进一步地，在所述管体外周壁上凸起的螺旋状导流结构，其表面高度为1～5mm，螺纹间距为5～20mm。
本发明的目的之二采用如下技术方案实现：
一种液体加热装置，包括：
如上所述的内管；所述内管两端的开口由金属材料制作的端盖密封；
外管，所述外管的内周壁与所述螺旋状导流结构最高点之间相隔预定的径向间隙，使外管套设在所述螺旋状导流结构的外部；所述外管的外周壁上设有加热组件；
所述内管、外管和螺旋状导流结构形成流道，所述流道两端的开口由密封盖密封；所述密封盖设置有第一通孔或第二通孔，液体经密封盖的第一通孔进入流道加热，经第二通孔排出。
本发明的目的之三采用如下技术方案实现：
一种液体加热装置，包括：
如上所述的内管；
外管，所述外管的内周壁与所述螺旋状导流结构最高点之间相隔预定的径向间隙，使外管套设在所述螺旋状导流结构的外部；所述外管的外周壁上设有加热组件；
所述内管、外管和螺旋状导流结构形成流道，所述流道两端的开口由所述扩口密封。
进一步地，所述流道入口设置有进液管；所述流道出口设置有出液管，所述进液管或出液管由第一通孔或第二通孔向内管两端开口方向延伸，显露于所述内管两端开口。
进一步地，所述扩口与所述外管末端焊接密封；所述进液管或出液管焊接于所述第一通孔或第二通孔。
进一步地，所述进液管连接有水泵，且所述出液管直径不大于所述进液管 直径，维持所述流道内液体压力保持在0.1～1.0兆帕。
进一步地，所述内管、扩口均为不锈钢材料制作。
进一步地，还包括温度传感器，以及与所述温度传感器电连接的控制器；所述温度传感器配置于所述外管的靠近所述第二通孔的位置处，所述控制器用于根据所述温度传感器发出的温度信息，控制所述水泵进液的速度和/或所述加热组件的加热功率。
本发明的目的之四采用如下技术方案实现：
一种液体加热装置的制备方法，制备如上所述的液体加热装置，包括以下步骤：
S1、根据内管的预设参数制备模具，将模具放入压力设备中，设定参数并调试设备；所述预设参数包括内管厚度、扩口的高度、螺旋状导流结构的高度与间距；
S2、将金属材料或金属合金材料放入模具中，密封并锁紧所述模具；所述金属材料或金属合金材料经退火处理；
S3、启动压力设备，高压水鼓推波成型，加工完成，将所述螺旋状导流结构与管体一体成型；
S4、泄压并松开模具，将制备完成的内管取出；
S5、将内管插入外管中，使内管最高点与外管的间距在0.1～0.6mm，将内管与外管两端对齐，开口通过焊接实现密封。
相比现有技术，本发明的有益效果在于：
本发明提供了一种用于液体加热装置的内管、液体加热装置及其制造方法， 采用金属或合金材料制成的内管、通过滚或压的方式在内管壁加工形成的螺旋状导流结构、与外管形成稳定的液体流道，且内管与螺旋状导流结构一体成型，避免了传统加热装置中在内管壁上增设导流结构中容易出现的老化、不安全且容易脱落的等问题，易于批量生产，节省制作材料，降低制造成本，提高了液体加热装置长期承受高温高压环境的稳定性能。
附图说明
图1为本发明所提供实施例1的结构示意图；
图2为本发明所提供实施例2的结构示意图；
图3为本发明所提供实施例3的结构示意图；
图4为本发明所提供实施例3的结构示意图；
图5为本发明所提供实施例3的剖面图；
图中：10、内管；11、螺旋状导流结构；12、流道；13、扩口；14、第二通孔；15、第一通孔；16、出液管；17、进液管；18、管体；20、外管；21、加热组件；22、发热电路；23、温度传感器；24、电极；30、端盖；31、凸块；40、密封盖；41、密封面；42、出液口；43、进液口。
具体实施方式
下面，结合附图以及具体实施方式，对本发明做进一步描述，需要说明的是，在不相冲突的前提下，以下描述的各实施例之间或各技术特征之间可以任意组合形成新的实施例。
在本发明的描述中，需要理解的是，术语“中心”、“纵向”、“横向”“上”、“下”、“前”、“后”、“左”、“右”、“水平”、“竖直”、“顶”、“内”、“外”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本 发明和简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为本发明的限制。此外，术语“第一”、“第二”仅用于描述目的，而不能理解为指示或暗示相对重要性。
本发明的描述中，需要说明的是，除非另有明确的规定和限定，术语“安装”、“相连”、“连接”应做广义理解，例如，可以固定连接，也可以是可拆卸连接，或一体地连接；可以是机械连接，也可以是电连接；可以是直接连接，也可以通过中间媒介间接相连，或是两个元件内部的连通。对于本领域的普通技术人员而言，可以根据具体情况理解上述术语在本发明中的具体含义。
实施例1
如图1所示，本发明提供了一种用于液体加热装置的内管10，具体包括了由金属或者合金制成的呈中空状的管体18，一个优选的实施例中，内管10采用不锈钢材料制作，如304不锈钢材料制作。螺旋状导流结构11通过模具或不锈钢管沿管体18的轴向方向在内管10的外周壁加工形成，使其沿管体18的轴向延伸，并在所述管体18的外周壁凸起形成螺旋凸起，则在内管10的内周壁表面对应位置为凹陷。通过模具一体成型，避免了传统的加热装置中，将内管10与导流结构分开制造再固定，容易出现的晃动、不稳定而导致脱落的情况，改变流道12的截面积影响进液或出液。保证流道12所通过的水流量的同时减小内管10与所述螺旋状导流结构11所需要的体积，进而减小与内管10相适配的外管20的直径，适用于小型的液体加热装置。并且/或者，所述内管10内周壁有轴向截面形状为三角形或者梯形或者矩形或者圆形的螺纹。将三角形或梯形的底边设置于管体18的外周壁，这样形成的流道12结构简单，便于生成，且导流性能更加稳定。
作为优选的实施方式，所述管体18的管壁厚度为0.3～1.0mm；所述螺旋状 导流结构11的表面高度为1～5mm，内管10表面的螺纹间距为5～20mm。在本实施例中，螺旋状导流结构11的表面高度为1.8mm，螺纹间距为6mm，配合液体加热装置中的套设于内管10外的外管20使用。
实施例2
如图2所示，本发明还提供了一种液体加热装置，包括了实施例1中所述的内管10，内管10两端开口由金属材料制作的端盖30密封；外管20，所述外管20的内周壁与所述螺旋状导流结构11最高点之间相隔预定的径向间隙，使外管20套设在所述螺旋状导流结构11的外部；所述外管20的外周壁上设有加热组件21；所述内管10、外管20和螺旋状导流结构11形成流道12，所述流道12两端的开口由密封盖40密封；所述密封盖40设置有进液口43或出液口42，液体经密封盖40的进液口43进入流道12加热，经出液口42排出。
内管10两端分别套设有端盖30，端盖30包括端盖壁与所述端盖壁连接的端盖面，所述端盖壁与所述内管10的外周壁密封通过焊接密封固定。流道12的两端由密封盖40密封，所述密封盖40包括密封壁、与所述密封壁连接的密封面41，所述密封壁与外管20的外周壁通过焊接密封固定。密封面41上设置有进液口43与出液口42，待加热液体由进液口43进入螺旋状导流结构11与内管10的外周壁与外管20的内周壁形成的流道12后，带加热液体沿着流道12流动的同时，集成在外管20的外周壁的加热组件21会对流动的液体进行加热。该加热组件21产生的热量通过外管20后与流道12内的液体进行热量交换，以实现对液体的连续加热。另外，使用端盖30与密封盖40分别对内管10、外管20进行密封，将内管10、外管20的密封结构各自独立加工，便于制造，且密封效果好，提高了液体加热装置长期承受高温高压环境的稳定性能。且端盖30、 密封盖40与内管10、外管20均使用不锈钢材料制造，有利于它们之间牢固焊接。
端盖30设有凸块31，用于固定住内管10的位置，且所述凸块31的正投影与所述进液口43或出液口42的正投影不重合。凸块31的数量可以根据实际情况进行设置。在本实施例中，凸块31的数量优选为两个，分别位于进液口43或出液口42的两侧，保证安装受力均匀。由于内管10需要套设在外管20与密封盖40的内部，因此，凸块31的高度小于或等于上端盖30与上密封盖40或下端盖30与下密封盖40之间的距离，防止密封盖40与外管20无法密封。凸块31的截面形状可以为三角形或者梯形或者矩形或者半椭圆形。将三角形或梯形或板椭圆形的底部固定与端盖30表面，且同时不会与密封盖40有过多接触，阻挡水流规则流动。
外管20的内周壁与螺旋状导流结构11最高点之间的径向间隙在预设数值的范围内，便于将内管10轻松套入外管20的同时，还避免了因径向间隙过大而导致液体直接通过该径向间隙沿着内管10的长度流至出液口42，而不沿着内管10外周壁的流道12进行导流，造成局部液体在流道12内停滞不前，并且接受加热组件21的持续加热，造成局部过热，结果会导致该处停滞不前的液体发生汽化产生蒸汽排出，进而造成出液口42的出液不连续并夹杂着大量气泡排出。本发明提供的实施例经大量实验证明，当该径向间隙设置在0.1～0.6mm的范围内时，既能实现液体的充分加热，加热的效果良好，还能避免液体过分加热的同时保证液体的流动顺畅，避免产生大的气泡。
实施例3
如图3、4、5所示，本发明还提供了另外一种液体加热装置，包括如实施 例1所述的内管10，与外管20所述外管20的内周壁与所述螺旋状导流结构11最高点之间相隔预定的径向间隙，使外管20套设在所述螺旋状导流结构11的外部；所述外管20的外周壁上设有加热组件21；所述内管10、外管20和螺旋状导流结构11形成流道12。与实施例2不同之处在于，所述流道12两端的开口由设于管体18两端的扩口13密封。
内管10的两端开口分别设置有扩口13，所述扩口13由管体18的外周壁向远离开口的方向延伸，扩口13与管体18的外周壁可通过焊接或模具一体成型。在本实施例中，将扩口13与管体18通过模具制造一体成型，密封性能良好且结构稳定，长时间高温加热后不会脱落。先将内管10套入外管20中，保持内管10与外管20的两端平齐，再将内管10两端的扩口13与外管20的内周壁焊接固定，实现流道12的密封。
管体18与扩口13均采用304不锈钢制成，耐腐蚀、耐热且机械性能良好，常温加工性能较好，可抵抗食品加工介质侵蚀。液体直接与内管10接触，采用304不锈钢材料不易生锈且对人体无害。在长期的高温高压条件下，避免如塑料、橡胶等材料因受热老化鼓泡，阻塞流道12的现象，更重要的是，避免塑料、橡胶长期加热产生的异味与分解的有毒物质，可对液体快速加热，提高加热液体的使用安全与本液体加热装置的使用寿命。本申请所提供的用于液体化热装置的内管10制造成本低，且满足食品卫生，能通过盐雾测试。但并不局限与仅仅只能使用不锈钢材料，使用铝合金或钛合金材料也在本发明的保护范围内。
在所述管体18内周壁上，位于所述螺旋状导流结构11的起始位置设有贯穿所述管体18管壁的第一通孔15，从而使得所述第一通孔15连通所述管体18的内周壁和外周壁，所述第一通孔15与管体18内周壁连接处形成流道12入口；位于所述螺旋状导流结构11的终止位置设有贯穿所述管体18管壁的第二通孔 14，从而使得所述第二通孔14连通所述管体18的内周壁和外周壁，所述第二通孔14与管体18内周壁连接处形成流道12出口。
由于内管10与外管20的两端均由扩口13密封，因此需要在内管10或外管20设置有流道12入口或流道12出口，在流道12入口或流道12出口设置与之适配的进液管17与出液管16。若将流道12入口或流道12出口设置于外管20的外周壁，则需要将进液管17或出液管16设置于本液体加热装置的外表面，会导致本液体加热装置的体积增大，无法直接应用于现有的外壳中。因此在本实施例中，将流道12入口或流道12出口设置于螺旋状导流结构11的起始位置与终止位置，连通管体18的内周壁与外周壁，且与内管10的末端存在一定的距离，使液体可以充满流道12，加热充分。进液管17或出液管16则均位于所述内管10内周壁，由进液口43或出液口42向内管10两端的开口方向延伸，并显露于内管10两端的开口。进液管17或出液管16设置于内管10的内部，不会增大本液体加热装置的体积，可直接应用于现有的外壳中，便于加工制造。且进液管17的入口或出液管16的出口与流道12入口或流道12出口存在一定的角度，避免液体无法充满流道12，导致加热不充分。
待加热液体通过进液管17由第一通孔15进入由内管10与螺旋状导流结构11、外管20内周壁形成的流道12后，待加热液体沿着流道12流动的同时，集成在外管20外周壁的加热组件21会对流动的液体进行加热。该加热组件21产生的热量通过外管20后与流道12内的液体进行热交换，以实现对液体的连续加热。液体充满流道12并加热完成后，由第二通孔14通过出液管16排出。
优选地，进液管17入口处配置有水泵(图中未示出)，向的流道12内不断地输送加压液体，且第二通孔14的直径比第一通孔15小，维持进液管17与出液管16之间流道12内的液体压力保持在0.1～1.0兆帕。
优选地，外管20上的外周壁设置有加热组件21。加热组件21包括配置与外管20的外周壁上的绝缘介质层及配置与绝缘介质层的发热电路22，在外管20的外周壁上印烧绝缘介质层，该发热电路22产生的热量用于对流道12内流动的液体进行热交换。该发热电路22包括固定于绝缘介质层上的多个发热电阻与电极24，各发热电阻的延伸方向与外管20的长度方向一致。发热电阻的两端分别与电极24电性连接，这样，在电极24处接入电源，供该发热电阻产生热量。
该液体加热装置还包括温度传感器23，以及与温度传感器23电连接的控制器(例如本实施例中采用PCB板控制)，该温度传感器23配置于外管20的靠近出液口42的位置处。由图中可以看出，本实施例中第一通孔15开设在内管10上，该温度传感器23为尽量靠近第二通孔14，可以设置在外管20的离第二通孔14最近的径向位置处。温度传感器23通过检测靠近第二通孔14的外管20的筒壁温度，即可近似检测第二通孔14的液体温度，该PCB板根据第一温度传感器23发出的温度信息，控制水泵进液的速度和/或发热电阻的加热功率。优选地，该温度传感器23设置在靠近出液口42的位置的同时并且尽量远离发热电阻，以便于准确检测出液口42液体的温度。这样，该温度传感器23用于检测出液的温度并反馈至PCB板，该PCB板根据实测的出液温度数据与用户设定出液所需温度进行比较，以自动调节发热电阻的加热功率，或者通过控制水泵以调节进入流道12内液体的流速，进而实现对出液温度的准确控制。
为便于对流道12内的液体进行均匀地加热，多个发热电阻绕外管20的外周壁分布设置，优选地可近似均匀的分布设置，使得发热电阻正对流道12内的液体，以向流动的液体及时传递热量。
本发明还提供了一种液体加热装置的制备方法，制备如上所述的液体加热 装置，包括以下步骤：
S1、根据内管10的预设参数制备模具，将模具放入压力设备中，设定参数并调试设备；所述预设参数包括内管10管壁厚度、扩口13的高度、螺旋状导流结构11的高度与间距；内管10管壁厚度为0.3～1.0mm，螺旋状导流结构11在内管10外周壁的表面高度为1～5mm，而螺纹间距为5～20mm。
S2、将金属材料或金属合金材料放入模具中，密封并锁紧所述模具；所述金属材料或金属合金材料经退火处理，以降金属或金属合金材料的硬度。在本实施例中选用不锈钢304材料，耐腐蚀、耐热，机械性能良好，且常温加工性能较好，可抵抗食品和加工介质侵蚀。
S3、启动压力设备，高压水鼓推波成型，加工完成；具体是利用压力对模具有限空间内的液体进行加压，通过水压对材料进行形变致贴近模具形状，将所述螺旋状导流结构11与管体18一体成型；
S4、泄压并松开模具，将制备完成的内管10取出；
S5、将内管10插入外管20中，使内管10最高点与外管20间距在0.1～0.6mm。将内管10与外管20两端对齐，开口通过扩口13焊接实现密封。
通过本方法制备该液体加热装置，采用不锈钢材料制成的内管10，螺旋状导流结构11由内管10在管体18通过模具水涨成型，避免了传统加热装置单独增设导流结构容易出现的老化、不安全且容易由内管10脱落等问题，降低制造成本，无需进行多次加工，成本低。另外，在内管10的两端开口设置扩口13，通过扩口13将内管10与外管20焊接，实现流道12的密封，形成的液体加热装置，组装简单，且密封效果好，满足批量化工业生产，提高了液体加热装置长期承受高温高压环境的稳定性能。
上述实施方式仅为本发明的优选实施方式，不能以此来限定本发明保护的范围，本领域的技术人员在本发明的基础上所做的任何非实质性的变化及替换均属于本发明所要求保护的范围。

Claims (12)

  1. 一种用于液体加热装置的内管，其特征在于，包括由金属或者合金制成的呈中空状的管体，所述管体的管壁厚度为0.3～1.0mm；通过滚或压的加工方法沿所述管体轴向在所述管体的内周壁上加工出螺旋状导流结构，使得所述螺旋状导流结构形成为沿所述管体的轴向延伸，并在所述管体外周壁上凸起，而在所述内周壁上凹陷。
  2. 如权利要求1所述的内管，其特征在于，还包括设置在所述管体两端的与所述管体一体成型的扩口。
  3. 如权利要求2所述的内管，其特征在于，在所述管体内周壁上，位于所述螺旋状导流结构的起始位置设有贯穿所述管体管壁的第一通孔，从而使得所述第一通孔连通所述管体的内周壁和外周壁，所述第一通孔与管体内周壁连接处形成流道入口；位于所述螺旋状导流结构的终止位置设有贯穿所述管体管壁的第二通孔，从而使得所述第二通孔连通所述管体的内周壁和外周壁，所述第二通孔与管体内周壁连接处形成流道出口。
  4. 如权利要求3所述的内管，其特征在于，在所述管体外周壁上凸起的螺旋状导流结构，其表面高度为1～5mm，螺纹间距为5～20mm。
  5. 一种液体加热装置，其特征在于，包括：
    如权利要求1所述的内管；所述内管两端的开口由金属材料制作的端盖密封；
    外管，所述外管的内周壁与所述螺旋状导流结构最高点之间相隔预定的径向间隙，使外管套设在所述螺旋状导流结构的外部；所述外管的外周壁上设有加热组件；
    所述内管、外管和螺旋状导流结构形成流道，所述流道两端的开口由密封盖密封；所述密封盖设置有出液口或进液口，液体经密封盖的进液口进入流道加热，经出液口排出。
  6. 一种液体加热装置，其特征在于，包括：
    如权利要求3或者4所述的内管；
    外管，所述外管的内周壁与所述螺旋状导流结构最高点之间相隔预定的径向间隙，使外管套设在所述螺旋状导流结构的外部；所述外管的外周壁上设有加热组件；
    所述内管、外管和螺旋状导流结构形成流道，所述流道两端的开口由所述扩口密封。
  7. 如权利要求6所述的液体加热装置，其特征在于，所述流道入口设置有进液管；所述流道出口设置有出液管，所述进液管或出液管由第一通孔或第二通孔向内管两端开口方向延伸，显露于所述内管两端开口。
  8. 如权利要求7所述的液体加热装置，其特征在于，所述扩口与所述外管末端焊接密封；所述进液管或出液管焊接于所述第一通孔或第二通孔。
  9. 如权利要求5或8所述的液体加热装置，其特征在于，所述进液管连接有水泵，且所述出液管直径不大于所述进液管直径，维持所述流道内液体压力保持在0.1～1.0兆帕。
  10. 如权利要求8所述的液体加热装置，其特征在于，所述内管、扩口均为不锈钢材料制作。
  11. 如权利要求9所述的液体加热装置，其特征在于，还包括温度传感器， 以及与所述温度传感器电连接的控制器；所述温度传感器配置于所述外管的靠近所述第二通孔的位置处，所述控制器用于根据所述温度传感器发出的温度信息，控制所述水泵进液的速度和/或所述加热组件的加热功率。
  12. 一种液体加热装置的制备方法，其特征在于，制备如权利要求6～11任一所述的液体加热装置，包括以下步骤：
    S1、根据内管的预设参数制备模具，将模具放入压力设备中，设定参数并调试设备；所述预设参数包括内管厚度、扩口的高度、螺旋状导流结构的高度与间距；
    S2、将金属材料或金属合金材料放入模具中，密封并锁紧所述模具；所述金属材料或金属合金材料经退火处理；
    S3、启动压力设备，高压水鼓推波成型，加工完成，将所述螺旋状导流结构与管体一体成型；
    S4、泄压并松开模具，将制备完成的内管取出；
    S5、将内管套设入外管中，使内管最高点与外管的间距在0.1～0.6mm，将内管与外管两端对齐，开口通过焊接实现密封。
PCT/CN2020/139249 2019-12-26 2020-12-25 用于液体加热装置的内管及液体加热装置、制造方法 WO2021129785A1 (zh)

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