US3702918A - Forced circulation air heating unit - Google Patents

Forced circulation air heating unit Download PDF

Info

Publication number
US3702918A
US3702918A US50637A US3702918DA US3702918A US 3702918 A US3702918 A US 3702918A US 50637 A US50637 A US 50637A US 3702918D A US3702918D A US 3702918DA US 3702918 A US3702918 A US 3702918A
Authority
US
United States
Prior art keywords
blower
channel
housing
entry
arrangement
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.)
Expired - Lifetime
Application number
US50637A
Other languages
English (en)
Inventor
Heinrich Moller
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.)
Braun GmbH
Original Assignee
Braun GmbH
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 Braun GmbH filed Critical Braun GmbH
Application granted granted Critical
Publication of US3702918A publication Critical patent/US3702918A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • A—HUMAN NECESSITIES
    • A45—HAND OR TRAVELLING ARTICLES
    • A45D—HAIRDRESSING OR SHAVING EQUIPMENT; EQUIPMENT FOR COSMETICS OR COSMETIC TREATMENTS, e.g. FOR MANICURING OR PEDICURING
    • A45D20/00—Hair drying devices; Accessories therefor
    • A45D20/04—Hot-air producers
    • A45D20/08—Hot-air producers heated electrically
    • A—HUMAN NECESSITIES
    • A45—HAND OR TRAVELLING ARTICLES
    • A45D—HAIRDRESSING OR SHAVING EQUIPMENT; EQUIPMENT FOR COSMETICS OR COSMETIC TREATMENTS, e.g. FOR MANICURING OR PEDICURING
    • A45D20/00—Hair drying devices; Accessories therefor
    • A45D20/04—Hot-air producers
    • A45D20/08—Hot-air producers heated electrically
    • A45D20/10—Hand-held drying devices, e.g. air douches
    • A45D20/12—Details thereof or accessories therefor, e.g. nozzles, stands
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D17/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
    • F04D17/02—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps having non-centrifugal stages, e.g. centripetal
    • F04D17/04—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps having non-centrifugal stages, e.g. centripetal of transverse-flow type
    • 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
    • F24H3/00—Air heaters
    • F24H3/02—Air heaters with forced circulation
    • F24H3/04—Air heaters with forced circulation the air being in direct contact with the heating medium, e.g. electric heating element
    • F24H3/0405—Air heaters with forced circulation the air being in direct contact with the heating medium, e.g. electric heating element using electric energy supply, e.g. the heating medium being a resistive element; Heating by direct contact, i.e. with resistive elements, electrodes and fins being bonded together without additional element in-between
    • F24H3/0411—Air heaters with forced circulation the air being in direct contact with the heating medium, e.g. electric heating element using electric energy supply, e.g. the heating medium being a resistive element; Heating by direct contact, i.e. with resistive elements, electrodes and fins being bonded together without additional element in-between for domestic or space-heating systems
    • F24H3/0417—Air heaters with forced circulation the air being in direct contact with the heating medium, e.g. electric heating element using electric energy supply, e.g. the heating medium being a resistive element; Heating by direct contact, i.e. with resistive elements, electrodes and fins being bonded together without additional element in-between for domestic or space-heating systems portable or mobile

Definitions

  • a rotatable crossflow blower is disposed eccentrically in the substantially semicylindrical section; [56] References Cited and a flat partition is disposed in the channel and UNITED STATES PATENTS defines with the blower circumference a gap of about one-twentieth the blower diameter and partitions the gggg 5/1966 Klilsworthy "415/54 channel into entry and exitportions.
  • the invention relates to an idle blower arrangement and more particularly to a blower arrangement wherein the blower portion of the apparatus forms a gap with the housing thereof.
  • the aforesaid gap is formed on the interior of the housing and said gap increases spirally in the direction of rotation of said blower as .well as in the opposite direction.
  • Blowers of this kind enjoy the advantage that they are able, without the aid of any auxiliary means such as eddy generators or pockets or the like, to operate satisfactorily. There is, however, still produced an eddy near the blower, which eddy can bring about a separation of the inflowing medium from the outflowing medium.
  • the medium may be a fluid, such as air.
  • the instant improved blower arrangement has various areas of application, such as for instance in hair dryers, room heating devices and like mechanisms. It may be important, however, to prevent the outflowing medium from mixing with the inflowing medium, for instance, when the medium has to be heated and there is needed for the heating device a relatively large area away from the blower portion yet still within the housing thereof.
  • One of ,the principal objects of the invention is to provide an idle blower which is not subject to the foregoing drawbacks.
  • a blower arrangement in the housing of which there is formed a common intake and discharge channel for the inflowing and outflowing media, such as a fluid, for instance air, said channel being divided by a partition which operates to separate the two media.
  • the partition is so positioned that the edge thereof which faces the body of the blower is disposed at a distance from the circumference of the blower of at least one-twentieth (1/20) of the blower diameter.
  • a common channel having parallel side walls and a partition parallel thereto offers the advantage that the air drawn in and the air blown out may at least partly work side by side, for cooling or drying.
  • An advantage of the hereinafter described blower arrangement is that the partition can accommodate heating and control devices.
  • FIG. 1 is a perspective view, partly in section, of an idle blower arrangement in accordance with an embodiment of the invention
  • FIG. 2 is a sectional view of a modified idle blower arrangement
  • FIG. 3 is a sectional view of a further modified blower arrangement.
  • a housing 1 which includes a semicylindrical section and a channel section that defines an entry and exit channel 2.
  • the channel 2 in a preferred embodiment has substantially parallel main or side walls 2', 2", and a rotatable blower 3 is mounted eccentrically in the housing 1. Due to the eccentric arrangement, there is formed a gap or portion 4 between the exterior of the blower 3 and the inner wall of the housing 1. This portion 4 spirally increases in the direction of the intake side as well as in the direction of the output side.
  • the end walls of the housing 1, as well as the electromotor, are not shown in the drawing, as they are of conventional type.
  • the housing 1 may in a preferred embodiment be arranged so that it will with its semicylindrical section surround the blower 3 at an angle of
  • the electromotor is operable to actuate the blower 3 and may be arranged within the housing 1 in axial prolongation of the blower 3.
  • the partition is disposed substantially parallel to the main walls 2', 2"; the innermost edge 5 of the partition 5 is arranged so that it faces the blower 3 and is at a distance therefrom of about one-twentieth of the blower diameter.
  • the partition 5 suhdivides the volume or cross-sectional area of the entry and exit channel 2 at a ratio of about 1 3 in favor of the entry portion.
  • the partition 5 divides the channel 2 into endwise connected, but otherwise separate entry and exit portions.
  • the partition 5, if desired, may be arranged in substantially parallel relationship to the main walls of the entry and exit channel 2.
  • the partition 5 may also be arranged near the other end by a plane intersecting at about the middle of the blower 3.
  • heating coils 6 which are connected in a circuit to an electric source by means of wires 7, 8.
  • a bimetallic switch 9 which is mounted on the partition 5, the switch 9 serving as a control device to prevent overheating.
  • the bimetallic switch 9 is comprised of a base -10 upon which the bimetal 11 is mounted. The free end of the bimetal 11 opens and closes the heating current at a contact place 12, depending on set temperature range of the switch 9.
  • a bimetallic switch 9 there may be mounted a suitable control device on the partition 5.
  • the intake and output channel 2 may furthermore be protected by a grate, to keep foreign objects out of the channel 2 and to prevent injury by the blower to either clothing, tools, or persons hands.
  • the blower 3 in a preferred embodiment rotates in the direction of the arrow 16 and sucks in the medium, for instance, air. Due to the gap 4 there is induced a fixed eddy near the blower 3. This prevents the exhaust air from mixing with the inflowing air near the blower 3. Within the intake and output channel 2, the two media are streaming in counter currents and are kept from mixing by the partition 5. The heating coils 6 warm up the passing air on its path to the blower 3 and away therefrom.
  • the relatively large distance between the blower 3 and the partition 5 generally will prevent the possibility that the partition 5 can become a creator of eddies. This large distance will have the effect of in creasing the noise dampening qualities of the arrangement.
  • the intake or entry channel 12 may be constructed so that it is shorter than the output or exit channel 13; such as where the latter is narrower than the former.
  • Other arrangements, such as eccentric arrangements of the blower 3, semicylindrical housing 1 and the partition 5 are the same as in FIG. 1. Shortening of the intake channel 12 may be advantageous from the point of view of saving space.
  • the blower arrangement in accordance with FIG. 3 depicts an intake channel 14 having side apertures 15.
  • the inlet and outlet sections of the channel 2 may be arranged side by side in the same plane.
  • the configuration of the blower 3 is otherwise unchanged.
  • the side apertures 15 are operative to reduce the suction pres- 1 sure, so that there is minimized the danger that dust will be sucked into the blower 3 along with the entering medium. There exists furthermore the possibility that the medium sucked in sideways will cool the driving motor of the blower 3.
  • a housing including substantially parallel upper and lower main walls and a substantially semicylindrical wall connected thereto defining a substantially semicylindrical section closing the rear of said housing, said main walls defining a channel for the entry and exit of fluid, said channel havingnear the housing front at least one opening for fluid intake and discharge,
  • a rotatable crossflow blower disposed eccentrically in said substantially semicylindrical section, being closer to the lower wall than to the upper wall, the axis of rotation of said blower being disposed below the center plane between said upper and lower walls,
  • a partition being flat throughout and disposed in said channel below a-plane tangent to the blower circumference and above a plane passing through said axis of rotation, and having its end portion nearest the blower spaced from the blower circumference for a distance of about one-twentieth of the blower diameter and partitioning said channel into entry and exit portions,
  • said upper and lower main walls extending frontwardly of the blower thereby enveloping the blower.
  • a blower arrangement as claimed in claim 1, wherein said housing surrounds said blower throughout an angle of about 3.
  • a blower arrangement as claimed in claim 1, wherein said partition defines a separating wall arranged substantially parallel to said main walls.
  • a blower arrangement as claimed in claim 4, and a heating device mounted on said separating wall.
  • a blower arrangement as claimed in claim 1, wherein said entry portion is shorter than the exit portion and the exit channel is narrower than the entry channel.
  • a blower arrangement as claimed in claim 1, the entry and exit portions having respectively, inlets and outlets arranged side by side in about the same plane.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Air-Conditioning Room Units, And Self-Contained Units In General (AREA)
  • Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
US50637A 1969-07-08 1970-06-29 Forced circulation air heating unit Expired - Lifetime US3702918A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
LU59050 1969-07-08

Publications (1)

Publication Number Publication Date
US3702918A true US3702918A (en) 1972-11-14

Family

ID=19726093

Family Applications (1)

Application Number Title Priority Date Filing Date
US50637A Expired - Lifetime US3702918A (en) 1969-07-08 1970-06-29 Forced circulation air heating unit

Country Status (9)

Country Link
US (1) US3702918A (enrdf_load_stackoverflow)
CS (1) CS161878B2 (enrdf_load_stackoverflow)
DE (1) DE2028698C3 (enrdf_load_stackoverflow)
ES (1) ES188223Y (enrdf_load_stackoverflow)
FR (1) FR2053999A5 (enrdf_load_stackoverflow)
GB (1) GB1305736A (enrdf_load_stackoverflow)
LU (1) LU59050A1 (enrdf_load_stackoverflow)
NL (1) NL168587C (enrdf_load_stackoverflow)
YU (1) YU33039B (enrdf_load_stackoverflow)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4014625A (en) * 1973-08-20 1977-03-29 Teruo Yamamoto Transverse flow fan
US4051893A (en) * 1975-07-25 1977-10-04 Raul Guibert Air curtain-projecting ventilator
USD246252S (en) 1975-02-13 1977-11-01 Firma Elektro-Warme Technik Heater
USD246254S (en) 1975-08-08 1977-11-01 Firma Elektro-Warme Technik Heater
USD246253S (en) 1975-08-08 1977-11-01 Firma Elektro-Warme Technik Heater
EP0296730A3 (en) * 1987-06-15 1989-08-23 Pulp And Paper Research Institute Of Canada Method and apparatus for the rapid consolidation and/or drying of porous webs
US4977306A (en) * 1987-11-24 1990-12-11 Sharp Kabushiki Kaisha Hair dryer having adjustable height and air flow
US6222987B1 (en) * 1999-05-06 2001-04-24 Auzville Jackson, Jr. Pizza box heater, components therefor and method
US20030231468A1 (en) * 2002-06-13 2003-12-18 Edward Lopatinsky Integrated crossflow cooler for electronic components
US20050214144A1 (en) * 2004-03-26 2005-09-29 Nidec Corporation Centrifugal Fan
US20100296799A1 (en) * 2009-05-20 2010-11-25 Hokwang Industries Co., Ltd. Airflow directing structure for hand dryers
CN103383146A (zh) * 2013-05-31 2013-11-06 镇江天信电器有限公司 暖风机电加热器用电加热体

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1368328A (en) * 1920-10-06 1921-02-15 Eaton Richard Max Electric heating device
DE1070337B (enrdf_load_stackoverflow) * 1959-12-03
US3109582A (en) * 1960-06-06 1963-11-05 Braun Ag Portable space ventilators
US3178100A (en) * 1961-01-25 1965-04-13 Datwyler Gottfried Fan
US3251540A (en) * 1963-12-17 1966-05-17 Lau Blower Co Air moving device
US3263749A (en) * 1964-03-06 1966-08-02 Beacon Morris Corp Compact space heating apparatus for use with forced-flow fluid-medium heating systems and method
US3284611A (en) * 1959-04-17 1966-11-08 Laing Nikolaus Portable hair dryers
US3308268A (en) * 1959-04-15 1967-03-07 Laing Nikolaus Portable hair dryers
US3322932A (en) * 1962-09-05 1967-05-30 Laing Vortex Inc Portable electric fan heater
US3524044A (en) * 1966-06-27 1970-08-11 Vincent L Liardi Deicing apparatus

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2033273A (en) * 1930-12-18 1936-03-10 Charles M Buck Blower
AT240514B (de) * 1962-09-20 1965-06-10 Theodor Dr Ing Helmbold Querstromgebläse
NL6602082A (enrdf_load_stackoverflow) * 1966-02-17 1967-08-18
FR1479790A (fr) * 1966-05-12 1967-05-05 Norrmalms Ind Ab Soufflerie perfectionnée assurant la circulation de fluides gazeux
FR90700E (fr) * 1966-08-18 1968-01-26 Al Ruckstuhl G M B H Ventilateur pour appareils de chauffage
US3322331A (en) * 1966-08-31 1967-05-30 Torrington Mfg Co Air impeller and housing units

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1070337B (enrdf_load_stackoverflow) * 1959-12-03
US1368328A (en) * 1920-10-06 1921-02-15 Eaton Richard Max Electric heating device
US3308268A (en) * 1959-04-15 1967-03-07 Laing Nikolaus Portable hair dryers
US3284611A (en) * 1959-04-17 1966-11-08 Laing Nikolaus Portable hair dryers
US3109582A (en) * 1960-06-06 1963-11-05 Braun Ag Portable space ventilators
US3178100A (en) * 1961-01-25 1965-04-13 Datwyler Gottfried Fan
US3322932A (en) * 1962-09-05 1967-05-30 Laing Vortex Inc Portable electric fan heater
US3251540A (en) * 1963-12-17 1966-05-17 Lau Blower Co Air moving device
US3263749A (en) * 1964-03-06 1966-08-02 Beacon Morris Corp Compact space heating apparatus for use with forced-flow fluid-medium heating systems and method
US3524044A (en) * 1966-06-27 1970-08-11 Vincent L Liardi Deicing apparatus

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4014625A (en) * 1973-08-20 1977-03-29 Teruo Yamamoto Transverse flow fan
USD246252S (en) 1975-02-13 1977-11-01 Firma Elektro-Warme Technik Heater
US4051893A (en) * 1975-07-25 1977-10-04 Raul Guibert Air curtain-projecting ventilator
USD246254S (en) 1975-08-08 1977-11-01 Firma Elektro-Warme Technik Heater
USD246253S (en) 1975-08-08 1977-11-01 Firma Elektro-Warme Technik Heater
EP0296730A3 (en) * 1987-06-15 1989-08-23 Pulp And Paper Research Institute Of Canada Method and apparatus for the rapid consolidation and/or drying of porous webs
US4977306A (en) * 1987-11-24 1990-12-11 Sharp Kabushiki Kaisha Hair dryer having adjustable height and air flow
US6222987B1 (en) * 1999-05-06 2001-04-24 Auzville Jackson, Jr. Pizza box heater, components therefor and method
US20030231468A1 (en) * 2002-06-13 2003-12-18 Edward Lopatinsky Integrated crossflow cooler for electronic components
US6903928B2 (en) * 2002-06-13 2005-06-07 Rotys Inc. Integrated crossflow cooler for electronic components
US20050214144A1 (en) * 2004-03-26 2005-09-29 Nidec Corporation Centrifugal Fan
US20100296799A1 (en) * 2009-05-20 2010-11-25 Hokwang Industries Co., Ltd. Airflow directing structure for hand dryers
US8064756B2 (en) * 2009-05-20 2011-11-22 Hokwang Industries Co., Ltd. Airflow directing structure for hand dryers
CN103383146A (zh) * 2013-05-31 2013-11-06 镇江天信电器有限公司 暖风机电加热器用电加热体

Also Published As

Publication number Publication date
NL168587B (nl) 1981-11-16
NL7009721A (enrdf_load_stackoverflow) 1971-01-12
CS161878B2 (enrdf_load_stackoverflow) 1975-06-10
DE2028698A1 (de) 1971-01-14
LU59050A1 (enrdf_load_stackoverflow) 1970-07-09
ES188223U (es) 1974-01-16
ES188223Y (es) 1974-09-16
GB1305736A (enrdf_load_stackoverflow) 1973-02-07
NL168587C (nl) 1982-04-16
YU162170A (en) 1975-08-31
DE2028698C3 (de) 1978-09-14
DE2028698B2 (de) 1978-01-19
YU33039B (en) 1976-03-31
FR2053999A5 (enrdf_load_stackoverflow) 1971-04-16

Similar Documents

Publication Publication Date Title
US3725640A (en) Electric fan heater
US3702918A (en) Forced circulation air heating unit
US3724092A (en) Portable hair dryer
US4135080A (en) Portable electric heat gun
GB1398156A (en) Fan particularly table fan
GB1124382A (en) Hair dryer
KR880013517A (ko) 열풍 순환식 조리기
KR930006392A (ko) 공기 조화기
US2552470A (en) Air circulator and heater
US2649242A (en) Variable capacity blower
US3324938A (en) Convection heat booster
US3305665A (en) Forced circulation electric heater employing cross-flow type fan
US4558571A (en) Water heating device of heat pump type
CN217695532U (zh) 出风嘴及电吹风
US3109582A (en) Portable space ventilators
US2459986A (en) Electric house furnace
US2904317A (en) Electric fan heater
US4225775A (en) Hair dryer
US2138333A (en) Drying apparatus
US2359571A (en) Air circulating device
US2503764A (en) Fan accelerated radiator cabinet
CN2318552Y (zh) 暖风机
US2091510A (en) Motor cooling fan and blower
US3584390A (en) Hair dryer
US3272966A (en) Device for drying hair and fingernails