CN1062443A

CN1062443A - The heating of bearing one class object

Info

Publication number: CN1062443A
Application number: CN 90109928
Authority: CN
Inventors: 乔治·威廉·泰勒
Original assignee: Charles Feeney
Current assignee: Charles Feeney
Priority date: 1990-12-10
Filing date: 1990-12-10
Publication date: 1992-07-01
Anticipated expiration: 2005-12-10
Also published as: CN1027027C

Abstract

A kind ofly be used for annular object, the induction heater of bearing for example, it comprises the magnetic induction ferrite core of a hinged clamp shape, iron core can be opened to lay heated object, when closed object is heated, the source of high frequency current that iron core has a winding and one to be produced by switched-mode power supply also has temperature-sensing element and security circuit, makes it to prevent to damage and guarantee and all can appropriately use for various different size objects owing to too high temperature.

Description

The heating of bearing one class object

The present invention relates to the heating of bearing and other annular objects, its requires to be placed on the axle or on the thing of pipe one class.

Induction heating is well-known at process aspect, realizes with such equipment usually: this equipment comprises a winding of a transformer, and bearer ring has just constituted secondary winding.Winding provides a horseshoe-shaped structure to this device for one time, and has a brace to connect circuit, and this brace is suitable for laying this bearing part on the induction contact position.

The induction heater of present many types is applied, but their application is limited to owing to more following shortcomings: induction heating relates at present by a high-power electric current, normally several kilowatts, in metallic conductor, produce very high caloric value by an induction coil, this primary winding is usually by common supply frequency power supply, generally have sizable size, it is very difficult that transportation is got up.Another shortcoming of prior art equipment is in heating process and the heating rear bearing needs degaussing.

An object of the present invention is to avoid having earlier some shortcomings in the technology, and a kind of portable equipment is provided, it can not make the magnetization excessively of bearing or ring.

According to the present invention, an induction type heater that is used for annular object comprises a clamp type magnetic induction iron core, and it can be opened to place heated object, a primary coil and a source of high frequency current, for example a switched-mode power supply.

In a preferred embodiment of the present invention, this core body is a ferrite.

Significant advantage of the present invention is that it can be produced by small-sized ultrasonic-frequency rotory generator owing to used high frequency electric source novelly, and this just can make a portable very little device.The application of high-frequency current has a low magnetic flux density at iron core and bearing inside, wherein because the resonance mode of operation decays vibration gradually, this means almost or do not produce magnetization, thereby the operation of degaussing can be cancelled.

The EPO retrieval demonstrates following existing patent:

GB-A-1454783

EP-A-027306

US-A-4311896

US-A-3895295

US-A-3187155

EP-A-143091

Neither one is that narration is of the present invention in the above-mentioned patent, and on the contrary, they emphasize the operation of inventing, and mentions because the neither one prior art and adopts high frequency electric source and avoid magnetized.

A specific embodiment of the present invention describes with reference to the accompanying drawings as follows, wherein:

Fig. 1 is according to the present invention, is used for the partial schematic sectional view of bigger bearing or annular object heater;

Fig. 2 is according to the present invention, is used for the partial schematic sectional view of less bearing or annular object heater;

Fig. 3 is the schematic diagram of a temperature sensor of usefulness in the present invention;

Fig. 4 is the schematic diagram of the high frequency electric source casing used among the present invention;

Fig. 5 is the block diagram of the switched-mode power supply used of heater.

Contrast Fig. 1 and Fig. 2, primary coil 10 is on ferrite core 12, and iron core is hinged at 14 places, makes bearing or annular object can be enclosed within an A or some B place.Primary winding 10 is to connect by plug 16 and switched-mode power supply 40, be used for illustrating in Fig. 4 of switched-mode power supply 40 casings, and the block diagram of circuit is shown in Fig. 5.Ferrite core 12 is closed in the shell 13 of heat-resisting and insulation.

With reference to Fig. 3, two responsive to temperature integrated circuit slice, thin pieces 18 are installed on the spring clip 20, the temperature of a measurement bearing or annular object, another measures ambient temperature or reference temperature.Two integrated circuit slice, thin pieces 18 connect with switched-mode power supply 40, are to connect by plug 22.

With reference to Fig. 4, switched-mode power supply 40 is contained in the aluminum hull 24 in the present invention.One time winding 10 is coupled by socket 26, and temperature sensor 18 is coupled by socket 28.Main circuit is to connect by switch 30 and fuse 32, and the temperature control of transducer 18 realizes that by potentiometer 34 switched-mode power supply 40 is connected by button 36, and indicates its on-state with light-emitting diode 38.

With reference to Fig. 5, the principal current of switched-mode power supply 40 circuit is by 42 rectifications, and through electrochemical capacitor 44 filtering, produces a level and smooth direct current.Then, this power supply is powered to a self-oscillatory inverter circuit 46, and its accurate frequency is adjusted by a control circuit 48.High pressure, the high-frequency current that (inclusion of this circuit is conspicuous for the people who is proficient in this road) produced powered to a winding 10, heats bearing or annular object 50 at the induction contact place then.

In an example of the present invention, select a kind of FERRITE CORE for use, it is adapted to be used on 20 kilo hertzs the frequency, it is length 94mm that Philips A320KP9012 type is used in such size, width 27mm, thickness 16mm, several such iron cores are assembled together and have just formed the heater shown in Fig. 1, and these magnetic cores are that copper cash with 2 * 1mm is around 15 circles.

Also comprise a redundant mesh, it makes major loop 40 operate in such frequency, and the power factor that makes a winding 10 is 1.It is always maximum that this just can guarantee to be transported to the power of load 50.(power factor may change when load variations, makes that the power in bearing or annular object reduces) this loop also has such function, transistor is switched when zero current, thereby reduced loss wherein.

Can obtain variable temperature setting by regulating 34, and make switched-mode power supply 40 automatic disconnections when arriving the temperature definite value, act on a buzzer with time delay, the measurement that temperature raises can enough liquid crystal displays.

When workpiece is mounted when heating, if not closed or temperature sensor is not fixed on the workpiece by the loop of temperature sensor, a safety circuit is the cutoff switch mode power, thereby forbids this power supply starting.

This invention provides the high induction heating equipment with low-power input.

Specific embodiment discussed above is not represented the restriction to the scope of the invention and basic theory thereof, and other embodiment is conspicuous for the people who understands thoroughly this respect.

Claims

1, an induction heater that is used for annular object comprises a magnetic induction iron core that presss from both sides shape, and it can be opened to place heated object, also has a primary winding and a source of high frequency current.

2, according to the induction heater of claim 1, wherein high-frequency current is provided by a switched-mode power supply.

3, according to the induction heater of above-mentioned arbitrary claim, core body ferrite system wherein.

4, according to the induction heater of above-mentioned arbitrary claim, it comprises and is placed on a ferrite core in the shell of being made by heat-resisting and non-conductive material, and a side of this heater is hinged, so that the insertion that is heated object mouth to be provided.

5, according to the induction heater of above-mentioned arbitrary claim, comprise temperature sensor to ambient temperature and workpiece temperature sensitivity, and the automatics of energy open circuit and/or starting warning.

6, according to the induction heater of above any claim, comprise a phase-locked loop or similar loop, can guarantee that pliotron or similar device trigger during when the voltage and current zero crossing or near zero point in cyclic process, and no matter owing to be heated the variation that the variation of workpiece size produces in the response characteristic of primary winding.

7, the induction heater according to claim 5 or 6 comprises a safety return circuit, is suitable for just in case when not closed, guarantee the switched-mode power supply fail to start in the loop by temperature sensor.