Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B24—GRINDING; POLISHING
  • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
  • B24B3/00—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools
  • B24B3/36—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools of cutting blades
  • B24B3/48—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools of cutting blades of razor blades or razors
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F27—FURNACES; KILNS; OVENS; RETORTS
  • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
  • F27B14/00—Crucible or pot furnaces
  • F27B14/06—Crucible or pot furnaces heated electrically, e.g. induction crucible furnaces with or without any other source of heat
  • F27B14/061—Induction furnaces
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B24—GRINDING; POLISHING
  • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
  • B24B47/00—Drives or gearings; Equipment therefor
  • B24B47/10—Drives or gearings; Equipment therefor for rotating or reciprocating working-spindles carrying grinding wheels or workpieces
  • B24B47/12—Drives or gearings; Equipment therefor for rotating or reciprocating working-spindles carrying grinding wheels or workpieces by mechanical gearing or electric power
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F27—FURNACES; KILNS; OVENS; RETORTS
  • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
  • F27B14/00—Crucible or pot furnaces
  • F27B14/08—Details peculiar to crucible or pot furnaces
  • F27B14/14—Arrangements of heating devices
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F27—FURNACES; KILNS; OVENS; RETORTS
  • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
  • F27B14/00—Crucible or pot furnaces
  • F27B14/08—Details peculiar to crucible or pot furnaces
  • F27B14/20—Arrangement of controlling, monitoring, alarm or like devices
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F27—FURNACES; KILNS; OVENS; RETORTS
  • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
  • F27D19/00—Arrangements of controlling devices
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F27—FURNACES; KILNS; OVENS; RETORTS
  • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
  • F27D21/00—Arrangements of monitoring devices; Arrangements of safety devices
  • F27D21/04—Arrangements of indicators or alarms
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F27—FURNACES; KILNS; OVENS; RETORTS
  • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
  • F27D19/00—Arrangements of controlling devices
  • F27D2019/0028—Regulation
  • F27D2019/0034—Regulation through control of a heating quantity such as fuel, oxidant or intensity of current
  • F27D2019/0037—Quantity of electric current

Definitions

• the present invention relates to a high frequency inductive melting furnace system for alarming poor feeding and excessive generation of air gap. More particularly, the present invention relates to a high frequency inductive melting furnace system, in which a proper quality factor
• Q value (hereinafter, referred to as "Q value") is set in advance for each high frequency inductive melting furnace, and is used to alarm poor feeding and excessive generation of air gap in the furnace by turning a red flashing light on and off or making an alarm sound when the Q value calculated by using detected current and voltage outputted from an inverter exceeds the preliminarily set Q value.
• FIG. 1 is a diagram showing an exemplary construction for describing the principle of high frequency induction heating.
• Induction heating is a method of heating a conductive object by placing a conductive object in a varying electro magnetic field. Therefore, an object must be conductive in order to be heated by induction heating.
• high frequency induction heating high frequency current is supplied from a high frequency power supply 100 and flows through a heating coil 110. Then, electromagnetic induction occurs on an object for heating 120, which is located inside of and wound by the heating coil 110, and causes eddy current and hysteresis core loss, which rapidly heat the surface of the object for heating 120.
• Induction heating as described above enables either rapid heating or selective heating of a local surface area of an object. Moreover, the induction heating can realize heating of such a high temperature which cannot be achieved a by combustion heating. In addition, the induction heating can improve productivity, produce high quality goods, provide pollution-protective and agreeable labor environment, save energy, achieve automation, facilitate reutilization of goods, and has various other advantageous. Therefore, such induction heating is being widely used now.
• FIG. 1 The configuration of the induction heater construction shown in FIG. 1 is similar to that of a transformer having a primary winding of N turns and a secondary winding of a single turn. However, the configuration shown in FIG. 1 is different from that of a typical transformer, in that the secondary winding of the induction heating construction is short-circuited. Further, configuration employs an air core, while a typical transformer employs an iron core in order to boost a magnetic coupling between the primary winding and the secondary winding.
• FIG. 2 is an equivalent circuit of an induction heater, which is expressed by using a transformer.
• a melting furnace 240 has a primary winding 210 and a secondary winding 220.
• Primary current I x applied from a high frequency power supply 200 flows through the primary winding 210, and secondary current I 2 induced by the primary current I ⁇ flows through the secondary winding 220.
• high frequency induction heating may happen even in a non-ferrous metal, as well as in a magnetic material such as iron or nickel. Therefore, high frequency induction heating may be used in melting or heat treatment of a non-ferrous metal such as copper, aluminum, etc.
• such a worker near the melting furnace should continuously observe the molten state of the object in the melting furnace and timely supply additional cold material into the melting furnace, according to the quantity of the molten object in the furnace, so as to reduce unnecessary heat loss as much as possible during the induction heating.
• a worker for the melting furnace simultaneously does various other jobs as well as this task of watching. Therefore, it is difficult for such a worker to continuously observe the melting furnace and to timely supply the cold material into the furnace. Even when a worker can continuously observe the melting furnace, it is still difficult for the worker to timely supply an appropriate amount of cold material into the furnace .
• the thermal energy generated by a heating coil may be wasted. Therefore, the conventional melting process is problematic in both aspects of working efficiency and energy loss.
• the present invention has been made in view of the above-mentioned problems, and it is an object of the present invention to provide a high frequency inductive melting furnace system, in which a proper limit quality factor is set in advance for each high frequency inductive melting furnace, and a red flashing light is turned on and off or an alarm sound is made when a quality factor calculated using detected current and voltage outputted from an inverter exceeds the limit quality factor set in advance, so that the system can signal poor feeding and excessive generation of air gap in the furnace by means of the quality factor.
• a high frequency inductive melting furnace system for melting a cold material by means of electromagnetic induction by high frequency electric current and for signaling poor feeding and excessive generation of air gap in the high frequency inductive melting furnace system
• the high frequency inductive melting furnace system comprising: an input transformer for transforming voltage fed from a high frequency power supply; a rectifier, connected to the input transformer, for rectifying AC voltage into DC voltage; a resonant capacitor connected in parallel to the rectifier; an inverter, connected in parallel to the resonant capacitor, for converting the DC voltage into single-phase AC voltage; a heating coil, connected to both the resonant capacitor and the inverter and winding a melting furnace, for receiving the single- phase AC voltage thereby generating AC magnetic flux; and a controller for controlling an operation frequency of the inverter, calculating a Q value by using instantaneous voltage and instantaneous current output from the inverter, and generating an alarm signal when the Q value exceeds a prescribed threshold Q value.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Furnace Details (AREA)
• General Induction Heating (AREA)
• Crucibles And Fluidized-Bed Furnaces (AREA)

Applications Claiming Priority (2)

Publications (1)

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ID=33028831

Family Applications (1)

Country Status (2)

Cited By (1)

Families Citing this family (1)

Citations (2)

• 2003
  • 2003-03-19 KR KR10-2003-0017210A patent/KR100511365B1/ko not_active IP Right Cessation
• 2004
  • 2004-03-17 WO PCT/KR2004/000582 patent/WO2004083756A1/en active Application Filing

Patent Citations (2)

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