A new type of industrial frequency power supply for electric furnace

Abstract

The utility model discloses a novel industrial frequency power supply for an electric furnace, and relates to the technical field of electric furnaces. The utility model comprises an air switch; a stepless voltage regulator, which is electrically connected to the air switch; an output end of the stepless voltage regulator is electrically connected to a reactor, a balancing capacitor and a compensation capacitor; an electric furnace coil, which is electrically connected to the compensation capacitor. A transformer rotor is rotated by a motor on the stepless voltage regulator to convert a source voltage into a required stepless and smooth voltage. The furnace temperature control transmits a signal to a PLC through a temperature control meter, and the voltage regulating motor is controlled by the PLC to regulate the voltage to achieve the effect of adjusting the power. The stepless voltage regulation can be realized, the power required by the electric furnace can be accurately adjusted, the furnace temperature uniformity is good, there is no impact on the power grid, and the energy saving is achieved. Especially when there are many components in the smelting furnace, the improved industrial frequency power supply can realize uniform stirring force and is not prone to segregation.

Description

Technical Field

[0001] The utility model relates to the technical field of electric furnaces, and more specifically to a novel industrial frequency power supply for electric furnaces. Background Art

[0002] Industrial frequency power refers to the AC power used in industry, generally refers to the frequency of the mains, 50Hz or 60Hz. In modern power systems, industrial frequency power is usually generated by the generator of the power plant, and then transmitted to the user end through transformers and transmission lines. At the user end, industrial frequency power can be used for various electrical equipment, such as motors, lamps, televisions, computers, etc. At the same time, industrial frequency power is also commonly used in industrial frequency induction heating and industrial frequency induction melting furnaces (industrial frequency induction melting furnace is a device that uses the principle of electromagnetic induction to heat metal materials to a molten state. It usually consists of a furnace body, an induction coil, a power supply, a control system, etc. When working, the induction coil of the industrial frequency induction melting furnace is passed through an industrial frequency current to generate an alternating magnetic field. Under the action of the alternating magnetic field, the metal material will generate an induced current, thereby generating Joule heat, causing the metal material to heat up and melt rapidly).

[0003] Conventional power frequency power supply such as Figure 1 As shown: the power supply enters the air switch through U, V, W, and enters the primary side of the autotransformer from the air switch. The secondary side of the autotransformer has several voltage levels from high to low. The secondary voltage is connected to the high, medium and low levels through the variable voltage regulator to convert the source voltage into several ( Figure 1 The furnace temperature is controlled according to the temperature control meter signal, and the high voltage and low voltage contactors are switched to adjust the voltage to achieve the effect of adjusting the power.

[0004] However, during the adjustment process, the high voltage and low voltage switching has a greater impact on the power grid and is poor in energy saving. Due to the high switching frequency during use, it will cause a lot of waste over time. For customers with higher product requirements, high and low voltage switching can easily cause large temperature fluctuations, segregation of components in the furnace, and affect product quality. Based on the above problems, we provide a new type of industrial frequency power supply for electric furnaces.

[0005] The above information disclosed in the background technology is only used to increase the understanding of the background technology of the utility model, therefore, it may include prior art that is not known to ordinary technicians in this field. Utility Model Content

[0006] In order to solve the problems raised in the above background technology, the utility model provides a novel industrial frequency power supply for an electric furnace.

[0007] The utility model provides a new type of industrial frequency power supply for electric furnaces adopts the following technical solutions:

[0008] A novel industrial frequency power supply for an electric furnace comprises an air switch; a stepless voltage regulator electrically connected to the air switch; an output end of the stepless voltage regulator electrically connected to a reactor, a balancing capacitor and a compensation capacitor; and an electric furnace coil electrically connected to the compensation capacitor.

[0009] Preferably, the power connection end of the air switch is three wires U, V, and W.

[0010] Preferably, the external power supply enters the air switch through three wires U, V, and W.

[0011] Preferably, the source voltage is converted into the required stepless and smooth voltage by rotating the transformer rotor through the motor on the stepless voltage regulator.

[0012] Preferably, the furnace temperature control transmits the signal to the PLC through the temperature control meter, and the PLC controls the voltage regulating motor to adjust the voltage to adjust the power.

[0013] In summary, the utility model includes the following beneficial technical effects:

[0014] The transformer rotor is rotated by the motor on the stepless voltage regulator to convert the source voltage into the required stepless and smooth voltage. The furnace temperature control transmits the signal to the PLC through the temperature control meter. The PLC controls the voltage regulating motor to adjust the voltage to achieve the effect of power adjustment. It can achieve stepless voltage regulation and accurately adjust the power required by the electric furnace. The furnace temperature has good uniformity, no impact on the power grid, and energy saving. Especially when there are many components in the smelting furnace, the improved industrial frequency power supply can achieve uniform stirring force and is not prone to segregation.

[0015] The above summary is for illustrative purposes only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments and features described above, further aspects, embodiments and features of the present invention will be readily apparent by reference to the accompanying drawings and the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of an industrial frequency power supply for an electric furnace in the prior art;

[0017] Figure 2 It is a schematic diagram of a novel industrial frequency power supply for an electric furnace in an embodiment of the utility model. DETAILED DESCRIPTION

[0018] The following is combined with Figure 2 The utility model is described in further detail.

[0019] It should be noted that the drawings are schematic and not to scale. For the sake of clarity and convenience, the relative sizes and proportions of the parts shown in the drawings are exaggerated or reduced in size, and any size is only illustrative and not restrictive. In addition, the same reference symbol is used for the same structure, element or accessory appearing in more than two figures to reflect similar features.

[0020] The utility model embodiment discloses a new type of industrial frequency power supply for electric furnace. Figure 2 A new type of industrial frequency power supply for an electric furnace includes an air switch; a stepless voltage regulator electrically connected to the air switch; an output end of the stepless voltage regulator electrically connected to a reactor, a balancing capacitor and a compensation capacitor; and an electric furnace coil electrically connected to the compensation capacitor.

[0021] Specifically, the power connection end of the air switch is three wires U, V, and W.

[0022] Specifically, the external power supply enters the air switch through three wires U, V, and W.

[0023] Specifically, the motor on the stepless voltage regulator rotates the transformer rotor to convert the source voltage into the required stepless and smooth voltage.

[0024] It is worth noting that the stepless voltage regulator is a stepless three-phase voltage regulator. The principle of the stepless three-phase voltage regulator is to change the phase of the induced potential on the stator winding and the rotor winding, and use the autocoupled line connection to make the output voltage also obtain smooth and stepless changes.

[0025] Specifically, the furnace temperature control transmits the signal to the PLC through the temperature control meter, and the PLC controls the voltage regulating motor to adjust the voltage to adjust the power.

[0026] The standard parts used in the utility model can all be purchased from the market, and special-shaped parts can be customized according to the instructions and the drawings. The specific connection methods of each part adopt the conventional means such as mature bolts, rivets, welding, etc. in the existing technology. The machinery, parts and equipment all adopt the conventional models in the existing technology, and the circuit connection adopts the conventional connection method in the existing technology, which will not be described in detail here.

[0027] The implementation principle of a new type of industrial frequency power supply for an electric furnace in the embodiment of the utility model is as follows: the power enters the air switch through U, V, and W, and the transformer rotor is rotated by the motor on the stepless voltage regulator to convert the source voltage into the required stepless and smooth voltage. The furnace temperature control transmits the signal to the PLC through the temperature control meter, and the PLC controls the voltage regulating motor to adjust the voltage to achieve the effect of adjusting the power.

[0028] In the description of the present utility model, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. The meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0029] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0031] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0032] In the drawings of the embodiments disclosed in the present utility model, only the structures related to the embodiments disclosed in the present utility model are involved, and other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of the present utility model can be combined with each other.

[0033] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art may still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A new type of industrial frequency power supply for electric furnace, characterized in that: include: Air switch; The stepless voltage regulator is electrically connected to the air switch; The output end of the stepless voltage regulator is electrically connected to a reactor, a balancing capacitor and a compensation capacitor; The electric furnace coil is electrically connected to the compensation capacitor.

2. The novel industrial frequency power supply for electric furnace according to claim 1 is characterized in that: The power connection end of the air switch is three wires U, V and W.

3. The novel industrial frequency power supply for electric furnace according to claim 2 is characterized in that: The external power supply enters the air switch through three wires: U, V, and W.

4. The novel industrial frequency power supply for electric furnace according to claim 1 is characterized in that: The motor on the stepless voltage regulator rotates the transformer rotor to convert the source voltage into the required stepless and smooth voltage.

5. The novel industrial frequency power supply for electric furnace according to claim 4 is characterized in that: The furnace temperature control transmits the signal to the PLC through the temperature controller, and the PLC controls the voltage regulating motor to adjust the voltage to adjust the power.

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