CN2034360U - Electromagnetic internal thermal heater - Google Patents

Abstract

"Electromagnetic internal heating heater" is an electric heating device. The device has a cooker structure, and a step-down transformer is installed under the pot body. The primary side coil of the transformer is connected to the power supply, and the secondary side coil is connected to the pot body, that is, the pot body is used as the load of the transformer, so that the electric energy is directly fed into the pot body for conversion. It has high electricity-to-heat conversion efficiency, low power consumption, and the pot temperature can be adjusted quickly and conveniently. The electric heating device of the present invention can be made into a structure in which the stove body and the pot body are integral or detachable, and can also be made into single-phase or three-phase. The device can be used as a variety of cooking and heating utensils, and is especially suitable for occasions where fire prevention and electromagnetic wave interference are required.

Description

The invention relates to an electric heating device

There are commercially available electric heaters for cooking—the induction cooker mainly includes:

1. Electric rice cookers, electric frying pans, and electric frying pans all use aluminum alloy blocks embedded with electric heating wire tubes as the heating elements of the pot body. The cooker with this structure loses a lot of heat during the transfer process, so the thermal efficiency is low and the power consumption is high. In addition, its thermal inertia is also large, so it is difficult to quickly adjust the pot temperature. It is easy to thermal breakdown at high temperature, so the service life is short.

2. Power frequency electromagnetic cooker, the cooker has a magnetic energy generator (iron core coil) under the cooker body, the magnetic energy enters the cooker body through the air gap, generates eddy current in the cooker body, and the cooker body is heated by the eddy current, and the excitation loss of this cooker Large, low power factor, and low thermal efficiency. When used, it is accompanied by electromagnetic vibration and electromagnetic noise, which will cause electromagnetic interference to other electrical appliances.

In view of the problems existing in the above-mentioned prior art, the task of the present invention is to provide an electromagnetic internal heating heating device with high thermal efficiency, low power consumption, fast and easy temperature adjustment of the pot body, and no electromagnetic interference and noise.

The technical solution of the invention task is: a step-down transformer is installed under the pot body of the heater with pot and stove structure, the primary side coil of the transformer is connected to the power supply, and the secondary side coil is connected with the pot body, that is, the pot body is used as the transformer body. The load feeds the electric energy into the pot body and directly converts it into heat energy to make it generate heat.

Since the present invention uses the pot body as the load of the step-down transformer, the electric energy is directly fed into the pot body to generate heat, so it can effectively improve the electricity-heat energy conversion efficiency and save electric energy. Effect, the low voltage and high current mostly pass through the inner surface of the pot, which can make the inner surface of the pot heat rapidly, its thermal inertia is small, the pot temperature adjustment response is fast, and the control is flexible.

The electromagnetic internal heating heater of the present invention can be made into an integral structure in which the pot body and the stove body are integrated, or can be made into a separate structure in which the pot body and the stove body can be separated. The present invention will be described in further detail below in conjunction with the accompanying drawings.

Fig. 1 is a sectional view of a specific structure of an integral heater.

FIG. 2 is an AA sectional view of FIG. 1 .

Fig. 3 is a sectional view of a specific structure of a separate heater.

Fig. 4 is a sectional view taken along line BB of Fig. 3 .

Referring to Fig. 1 and Fig. 2, a step-down transformer is placed under the pot body 1. The closed iron core 3 of the transformer is an annular iron core formed by stacking or rolling silicon steel sheets, and the iron core is covered with a primary coil 4 and a secondary coil. 2. The primary coil is a concentrated coil set on the iron core. The secondary coil is usually composed of several U-shaped copper rods. The iron core is evenly placed outside the primary coil, and the two ends of each U-shaped copper rod are respectively welded to the outer surface of the pot body 1. In this way, several U-shaped copper rods form a parallel connection, and the secondary side of the transformer is connected through the pot body. form a closed circuit. When the primary side coil is powered on, a low-voltage high current flows through the pot body, which causes the pot body to heat up, and the temperature of the pot body can be adjusted by changing the power supply voltage. In order to prevent heat loss, an insulation layer 8 is generally wrapped on the outer surface of the pot. There is insulation between the transformer core and the coil and between the primary coil and the secondary coil. The transformer is fixed on the bracket 6 at the bottom of the cooker body 7 with bolts 5, so that the integral structure heater in which the pot body and the cooker body are connected as one is obtained.

Fig. 3 and Fig. 4 are embodiments of the separable heater of the present invention. The step-down transformer iron core 3 and the primary side coil 4 arranged under the pot body 1 are fixed on the stove body bracket 6, and the several U-shaped copper rods forming the side coil 2 of the transformer that are evenly arranged and nested along the closed iron core are passed through Insulation is also fastened with the stove body. An electric contact block 1A is cast or welded at the bottom near the center of the outer surface of the pot body and along the circumference of the pot body to contact with the U-shaped copper rod when the pot body is put into the stove body in a screw-in manner to form a closed circuit. The contact surface between the contact block and the U-shaped copper rod is preferably coated with a heat-resistant and anti-oxidation conductive agent (such as an electrical contact conductive paste) to ensure a good and reliable electrical connection between them. For ease of use, it is better to set an electric automatic opening and closing device. As shown in the figure, a positioning sleeve 12 can be fixed in the center of the bracket of the stove body, so that the small head of a central bumper column 10 with a T-shaped longitudinal section can pass through the positioning Sleeve 12, and support with spring 9, its large end can touch with the center of the bottom of the pot, and under the positioning sleeve, the electric interlocking contact 11 is housed, like this, when the pot body is put into the stove body, utilize pot Body weight, so that the center bumper column 10 goes down along the positioning sleeve, touches the electrical interlock contact 11, and the power is turned on, and when the pot body is taken away, the center bumper column 10 goes up along the positioning sleeve by the spring force, Cut off the power.

The electromagnetic internal heating heater of the present invention can be single-phase or three-phase. When it is made into a three-phase heater, the step-down transformer under the pot body is a three-phase transformer, and its primary side coil is connected to a three-phase power supply. , and the two ends of the U-shaped copper rods that constitute the side coils of each phase are connected with the pot body.

Tests show that the heater of the present invention directly converts electric energy into heat on the pot body, so it has high energy conversion efficiency, low power consumption, fast pot temperature adjustment speed, and is convenient and reliable to use. The present invention can be used as various cooking and heating utensils, and is especially suitable for occasions requiring anti-fire, flammable and anti-electromagnetic wave interference.

Claims (5)

1. An electromagnetic internal heating heater, which has a pot body [1], the pot body is located in the stove body [7], and is characterized in that a step-down transformer is installed under the pot body [1], and the transformer is closed The iron core [3] is covered with primary side coil [4] and secondary side coil [2], and its primary side coil is connected to power supply, and secondary side coil is connected with the outer surface of pot body [1]. 2. The heater according to claim 1, characterized in that said secondary coil is composed of several U-shaped copper rods, and the two ends of each U-shaped copper rod are respectively connected to the outer surface of the pot body (1). Surface welded. 3. The heater according to claim 1, characterized in that a contact block [1A] is cast or welded on the outer surface of the pot body. The coils are connected. 4. The heater according to claim 3, characterized in that a positioning sleeve (12) is fixed at the center of the bracket (6) of the stove body, and a center bumper column (10) passes through the sleeve, and its Supported by a spring (9), it is used to touch the electrical interlock contact (11) installed under the positioning sleeve (12) to control the on-off of the power supply. 5. The heater according to claim 1, characterized in that the step-down transformer installed under the pot body (1) is a single-phase transformer or a three-phase transformer.

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