EP4311375A1 - Elektrischer flüssigkeitserhitzer - Google Patents

Elektrischer flüssigkeitserhitzer Download PDF

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Publication number
EP4311375A1
EP4311375A1 EP22185572.9A EP22185572A EP4311375A1 EP 4311375 A1 EP4311375 A1 EP 4311375A1 EP 22185572 A EP22185572 A EP 22185572A EP 4311375 A1 EP4311375 A1 EP 4311375A1
Authority
EP
European Patent Office
Prior art keywords
heater
channel
coils
electrical
electrical fluid
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.)
Pending
Application number
EP22185572.9A
Other languages
English (en)
French (fr)
Inventor
Catalin-Doru ANGHEL
Jiri Skoda
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.)
Valeo Systemes Thermiques SAS
Original Assignee
Valeo Systemes Thermiques SAS
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 Valeo Systemes Thermiques SAS filed Critical Valeo Systemes Thermiques SAS
Priority to EP22185572.9A priority Critical patent/EP4311375A1/de
Priority to PCT/EP2023/069970 priority patent/WO2024017919A1/en
Publication of EP4311375A1 publication Critical patent/EP4311375A1/de
Pending legal-status Critical Current

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Classifications

    • 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
    • H05B3/78—Heating arrangements specially adapted for immersion heating
    • H05B3/80—Portable immersion 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
    • 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
    • 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
    • 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
    • H05B3/02—Details
    • H05B3/06—Heater elements structurally combined with coupling elements or holders
    • 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
    • F24H1/142—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 using electric energy supply
    • 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
    • H05B2203/014—Heaters using resistive wires or cables not provided for in H05B3/54
    • 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 an electrical fluid heater, more specifically, the present invention relates to an electrical fluid heater for a vehicle.
  • FIG. 1a and FIG. 1b illustrate isometric views of a conventional electrical heater 1.
  • the conventional electrical heater 1 includes a housing 2, a heater coil 6 and a Printed Circuit Board (PCB) 8.
  • the housing 2 includes side walls 2a, 2b, 2c and 2d and a cover 2e and a base 2f.
  • the housing 2 further includes a channel 4 formed thereon for receiving electrical heater coil 6.
  • the channel 4 is formed on one side accessible by removing the cover 2e.
  • One end of the heater coil 6 acts as positive terminal whereas other end of the heater coil 6 acts as negative terminal to cause current to flow through the heater coil 6 for heating of the heater coil 6.
  • the power supply to the heater coil 6 is controlled by the PCB 8 received in the housing 2.
  • the housing 2 further includes inlet port 3a and outlet port 3b for ingress and egress of fluid.
  • the fluid entering inside the housing 2 flows around the heater coil 6 received in the channel 4 to extract heat from the heater coil 6 and egresses out of the housing 2 after undergoing heat exchange and extracting heat from the heater coil 6.
  • the channel 4 generally receives a single heater coil 6, however, the heating capacity of electrical fluid heater 1 using a single heater coil 6 is insufficient for heating the fluid.
  • the heating capacity of the electrical fluid heater 1 is directly proportional to surface area of the heater coils 6 that depends on the length of the heater coils 6 and the number of the heater coils 6.
  • the channel 4 and the heater coil 6 received in the channel 4 follows a torturous path with number of turns.
  • packaging and routing of the multiple heater coils 6 in limited space inside the channel 4 is a problem. Further, in case multiple heater coils 6 are packaged in limited space within the channel 4, the heater coils 6 are required to be maintained spaced apart from each other and spaced from the inside walls of the channel to prevent short circuiting.
  • an electrical heater with multiple heater coils that can be arranged in limited space inside the channel without danger of short-circuiting. Further, there is a need for an electrical heater that addresses packaging and routing issues associated with multiple heater coils arranged in limited space inside the channel.
  • An object of the present invention to obviate drawbacks associated with conventional electrical heaters, particularly, routing and packaging issues associated with packaging of multiple heater coils in limited space inside the channel.
  • Another object of the present invention is to provide an electrical heater that ensures thermal insulation between multiple heater coils and thermal insulation between the heater coils and the channel.
  • Still another object of the present invention is to provide an electrical heater that exhibits comparatively more service life and requires comparatively less maintenance than conventional electrical heaters.
  • some elements or parameters may be indexed, such as a first element and a second element.
  • this indexation is only meant to differentiate and name elements which are similar but not identical. No idea of priority should be inferred from such indexation, as these terms may be switched without betraying the invention. Additionally, this indexation does not imply any order in mounting or use of the elements of the invention.
  • the electrical fluid heater includes a housing, a plurality of heater coils, an inlet nozzle and an outlet nozzle.
  • the housing is formed with a channel.
  • the heater coils are received within the channel in spaced apart relation with respect to each other and with respect to inner walls of the channel.
  • the inlet is for ingress of fluid inside the housing and surrounding the heater coils.
  • the outlet is for egress of fluid from the housing after the fluid had extracted heat from the heater coils.
  • the heater coils having respective main portions arranged along respective parallel, planes and adjacent to each other with spacing between adjacent heater coils being at least 3 mm.
  • each channel follows a torturous path.
  • a depth "d" of each channel is at least 2.5 times diameter of the heater coil.
  • a width "w" of each channel at least 1.5 times diameter of the heater coil.
  • the heater coils are disposed centrally with respect to a width "w" of the channel.
  • the heater coils are uniformly spaced with respect to each other along the length thereof.
  • each of the heater coils are on opposite sides of the center of a depth "d" of the channel.
  • the electrical heater includes at least one holding clip for holding the heater coils inside the channel.
  • the electrical heater includes sleeves of insulating material disposed between the heater coil and the corresponding holding clips.
  • the sleeve is of ceramic material.
  • each heater coil includes the main portion and a connection portion orthogonal to the main portion.
  • the main portion is at least 80 percent, particularly, 90 percent of the total length of the corresponding heater coil.
  • connection portions are extending parallel to each other.
  • the present invention is explained with an example of electrical fluid heater for use in vehicle, however, the present invention is also applicable for any vehicular or non-vehicular applications, wherein current carrying heater coils are required to be packaged and routed in a limited space of a channel without danger of short circuit.
  • FIG. 2 illustrates an isometric view of an electrical fluid heater 100 in accordance with an embodiment of the present invention.
  • FIG. 3 illustrates an isometric view of the electrical fluid heater 100 without a cover 10h for depicting internal details, such as a channel 10a formed on one side of the housing 10 of the electrical fluid heater 100.
  • FIG. 4 illustrates an isometric view of the electrical fluid heater 100 without the side-walls and the cover 10g.
  • the electrical fluid heater 100 includes a housing 10, a plurality of heater coils 20, an inlet nozzle 12 and an outlet nozzle 14.
  • the housing 10 includes a pair of opposite front and rear walls 10c and 10d, a pair of opposite sidewalls 10e and 10f and a pair of opposite top cover 10g and bottom cover 10h.
  • the walls and the covers together define an enclosure for receiving a PCB 50, the channel 10a and the fluid to be heated around the channel 10a.
  • the top and bottom covers 10g and 10h are removable to access an interior of the housing 10 for inspection and maintenance.
  • the housing 10 is formed with the channel 10a.
  • the channel 10a is preferably formed on one side thereof.
  • the present invention is not limited any particular configuration of the housing 10 as far as the housing 10 defines an enclosure for receiving the PCB 50, the channel 10a and the fluid to be heated around the channel 10a receiving the heater coils 20.
  • the PCB 50 controls the heating of the heater coils 20 by controlling the current supplied to the heater coils 20.
  • the channel 10a can be formed on any one side or extend to multiple sides of the housing 10.
  • the channel 10a is having a rectangular cross section.
  • the present invention is not limited to any particular configuration, placement and number of the channels formed on the housing 10 as far as the channel receive and securely hold the heater coils 20 therein to enable heat exchange between the fluid flowing around the channel 10a with the heater coil 20 received inside the channel 10a.
  • the inlet nozzle 12 and the outlet nozzle 14 are formed on one of the sides of the housing, preferably the sidewall 10e of the housing 10.
  • the side wall 10d further includes at least one electrical connector 16a and 16b for supplying electrical power to the heater coils 20 via the PCB 50 after being regulated by the PCB 50. More specifically, the electric power is transmitted from the electrical connector 16a and 16b to the PCB 50 and thereafter to the resistance inside the heater coils 20 after being regulated by the PCB 50.
  • the inlet nozzle 12 is for ingress of fluid inside the housing 10, particularly, the inlet nozzle 12 supplies fluid to the fluid flow passages inside the housing 10 around the heater coils 20 received inside the channel 10a to extract heat from the heater coils 20 received in the channel 10a.
  • the fluid entering the hosing 10 via the inlet nozzle 12 is supplied to the annular space between the heater coils 20 and the inner walls 10b of the channel 10a.
  • the outlet nozzle 14 is for the egress of the fluid from the electrical fluid heater 100 after the fluid had undergone heat exchange and extracted heat from the heater coils 20.
  • the present invention is not limited to the number and placement of the inlet nozzle 12, the outlet nozzle 14 and the electrical connectors 16a and 16b.
  • the heater coils 20 has one end connected to positive terminal and another end connected to negative terminal to allow current flow there through to cause heating of the heater coils 20.
  • each of the heating coil 20 includes a main portion 20a and a connection portion 20b orthogonal to the main portion 20a.
  • the main portion 20a is at least 80 percent, particularly, 90 percent of the total length of the corresponding heater coil 20.
  • the connection portions 20b are extending parallel to each other.
  • the main portions 20a are received in channel 10a.
  • the heater coils 20 are having respective main portions arranged along respective parallel, planes and adjacent to each other with spacing between adjacent heater coils being at least 3 mm. With such configuration, the heater coils 20 are received within the channel 10a in spaced apart relation with respect to each other and with respect to inner walls 10b of the channel 10a. The heating coils 20 reject heat to the fluid received in the channel 10a and around the heating coils 20.
  • the heating capacity of the electrical fluid heater 100 is directly proportional to surface area of the heater coils 20 that depends on the length of the heater coils 20 and the number of the heater coils 20.
  • the channel 10a and the heater coil 20 received in the channel 10a follows a torturous path with number of turns.
  • more number of the heater coils 20 are disposed within limited space of the channel 10a.
  • the heater coils 20 are arranged adjacent to each other with spacing between adjacent heater coils being at least 3 mm. The main portions of the respective heater coils 20 are disposed one above the other inside the channel 10a.
  • At least one holding clip 30 is disposed within the channel 10a to hold the heater coils 20 inside the channel 10a. More specifically, referring to the FIG.5 , the holding clip 30 maintains the heater coils 20 at desired spacing with respect to the inner walls 10b of the channel 10a. In a preferred embodiment, multiple holding clips 30 are disposed inside the channel 10a to hold multiple heater coils 20 spaced away from each other and from inside walls 10b of the channel 10a. However, the present invention is not limited to number and placement of the holding clips 30 as far as the holding clips 30 are capable of holding the heater coils 20 spaced away from each other and from inside walls 10c of the channel 10a when received in the channel 10a.
  • the channel 10a is of such configuration that depth "d" of each channel 10a is at least 2.5 times diameter of the heater coil 20 in case two heater coils 20 are disposed one underneath the other adjacent to each other inside the channel 10a. Specifically, a depth of the channel 10a is based on the number of the heater coils 20 arranged one above the other adjacent to each other within the channel 10a. Further, the channel 10a is of such configuration, that a width "w" of each channel 10a at least 1.5 times diameter of the heater coil 20. With such configuration, the heater coils 20 are uniformly spaced with respect to each other along the length thereof and the heater coils 20 are spaced from the inner walls 10b of the channel 10a. Referring to the FIG.
  • the heater coils 20 are disposed centrally with respect to a width "w" of the channel 10a. Each of the heater coils 20 are on opposite sides of the center of a depth "d" of the channel 10a. With such configuration of the channel 10a receiving the heater coil 20, the heater coils 20 are sufficiently spaced apart from each other and inside walls of the channel 10a.
  • the electrical fluid heater 100 further includes arrangement for electrically insulating the heater coils 20 with respect to each other and the inside 10b walls of the channel 10a.
  • the arrangement includes sleeves 40 of insulating material disposed between the heater coil 20 and the corresponding holding clips 30. Generally, the sleeve 40 is of ceramic material.
  • either one of inside walls of the holding clips 30 or outside walls of the heater coil 20 held in the holding clips 30 is formed with a lining of ceramic material.
  • the present invention is not limited to any particular arrangement for insulating the heater coils 20 with respect to the inner walls 10b of the channel 10a.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Instantaneous Water Boilers, Portable Hot-Water Supply Apparatuses, And Control Of Portable Hot-Water Supply Apparatuses (AREA)
EP22185572.9A 2022-07-18 2022-07-18 Elektrischer flüssigkeitserhitzer Pending EP4311375A1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP22185572.9A EP4311375A1 (de) 2022-07-18 2022-07-18 Elektrischer flüssigkeitserhitzer
PCT/EP2023/069970 WO2024017919A1 (en) 2022-07-18 2023-07-18 An electrical fluid heater

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP22185572.9A EP4311375A1 (de) 2022-07-18 2022-07-18 Elektrischer flüssigkeitserhitzer

Publications (1)

Publication Number Publication Date
EP4311375A1 true EP4311375A1 (de) 2024-01-24

Family

ID=82655215

Family Applications (1)

Application Number Title Priority Date Filing Date
EP22185572.9A Pending EP4311375A1 (de) 2022-07-18 2022-07-18 Elektrischer flüssigkeitserhitzer

Country Status (1)

Country Link
EP (1) EP4311375A1 (de)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5892888A (en) * 1996-05-28 1999-04-06 Piscine Service Anjou Sa Means for electrically heating a circulating fluid in a basin or pool
DE102018119041A1 (de) * 2018-08-06 2020-02-06 Webasto SE Elektrisches Heizgerät

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5892888A (en) * 1996-05-28 1999-04-06 Piscine Service Anjou Sa Means for electrically heating a circulating fluid in a basin or pool
DE102018119041A1 (de) * 2018-08-06 2020-02-06 Webasto SE Elektrisches Heizgerät

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