Electric heating plate temperature safety control device and electric heating equipment

Abstract

The utility model discloses an electric heating plate temperature safety control device and electric heating equipment, and relates to the field of mining refining. In order to overcome the defects that an existing electric heating plate is high in cost and not suitable for a strong corrosive experiment environment, the output end of a regulator is connected with the input end of an adjustable silicon controlled rectifier, and the output end of the adjustable silicon controlled rectifier is connected with the input end of an alternating current contactor. The output end of the AC contactor is connected with the input end of the electric heating plate, and the input end of the current and voltage dual display meter is connected with the output end of the AC contactor. And the output end of the temperature safety control device is connected with the input end of the electric heating plate. The adjustable electric heating plate is mainly used for adjustable heating of the electric heating plate.

Description

Technical Field

[0001] The utility model relates to the field of mining and refining, in particular to a temperature safety control device for an electric heating plate and electric heating equipment. Background Art

[0002] In the process of metal smelting, temperature is one of the key parameters, which directly affects the extraction rate and quality of the metal, but the boiling point of different solutions is different. For example, the boiling point of concentrated sulfuric acid is about 337℃, and the boiling point of salt solution is close to that of pure water, which is about 100℃.

[0003] In the past, it cost tens of thousands of yuan to buy a polysilicon electric heating device to dissolve samples. The principle is to build a temperature-controlled furnace wire into the lower surface of polysilicon, and achieve the technical effect of precise temperature control through a set of excellent programming software; but for the purification of precious metals, it is usually only necessary to keep the solution in a slightly boiling state, and such precise temperature control is not required. Taking pure water as an example, the heating temperature of 102℃-110℃ does not affect the slightly boiling state of pure water. And the solutions commonly used in laboratories include hydrochloric acid, sulfuric acid, aqua regia, etc. for precious metal purification, and the temperature is generally 60-500℃.

[0004] Although there are cheaper electric heating devices on the market, most silicon carbide heating devices do not have temperature control functions and cannot be used for different solutions; and infrared heating plates are mostly small in size and cannot carry out multiple experiments at the same time. If you want to use infrared heating plates to achieve a larger heating range, the cost is thousands or tens of thousands. In addition, the outer wall of the infrared heating plate is usually made of metal, which makes it unsuitable for experimental environments with highly corrosive solutions.

[0005] Therefore, there is a need for a temperature safety control device and electric heating equipment for an electric heating plate which can keep the solution in a continuously slightly boiling state, has a large temperature adjustment range, is low in cost, and is convenient and fast. Utility Model Content

[0006] In order to solve the defects of the existing electric heating plate that it is expensive and cannot be applied to a highly corrosive experimental environment, the utility model provides an electric heating plate temperature safety control device and electric heating equipment which can keep the solution in a continuously slightly boiling state, has a large temperature adjustment range, is low in cost, and is convenient and fast.

[0007] The utility model discloses a temperature safety control device for an electric heating plate, comprising an adjustable thyristor, a regulator, a current and voltage dual display meter and an AC contactor, wherein the output end of the regulator is connected to the input end of the adjustable thyristor, the output end of the adjustable thyristor is connected to the input end of the AC contactor, the output end of the AC contactor is connected to the input end of the electric heating plate, and the input end of the current and voltage dual display meter is connected to the output end of the AC contactor.

[0008] The beneficial effects of adopting the above technical solution are:

[0009] The input voltage of the adjustable thyristor is adjusted by the regulator, and the voltage and current values ​​of the AC contactor are monitored in real time through the current and voltage dual display meter to determine the output power of the AC contactor, and the heating temperature of the electric heating plate is controlled by controlling the output power.

[0010] Furthermore: a circuit breaker is also included, and the circuit breaker is arranged between the AC contactor and the electric heating plate.

[0011] The beneficial effects of adopting the above technical solution are:

[0012] The safe operation of the temperature safety control device is guaranteed by setting a circuit breaker.

[0013] Furthermore: a switch is also included, and the output end of the switch is connected to the input end of the AC contactor.

[0014] Furthermore: the switch is a two-speed knob switch.

[0015] The beneficial effects of adopting the above technical solution are:

[0016] The entire temperature safety control device can be powered off by setting a switch to avoid useless energy consumption.

[0017] Furthermore: the regulator is a rotary knob, a sliding switch or a rheostat.

[0018] The beneficial effects of adopting the above technical solution are:

[0019] Provide a variety of options to make the adjustment function of the regulator more suitable for the experimental scenario.

[0020] The utility model discloses an electric heating device, which comprises a temperature safety control device and an electric heating plate. The output end of the temperature safety control device is connected to the input end of the electric heating plate.

[0021] The beneficial effects of adopting the above technical solution are:

[0022] By setting a temperature safety control device, the heating temperature of the electric heating plate can be adjusted, and it also has a protective function.

[0023] Furthermore: the electric heating plate is a silicon carbide heating plate.

[0024] The beneficial effects of adopting the above technical solution are:

[0025] The use of silicon carbide heating plates reduces costs from the source and can achieve the same heating effect.

[0026] Furthermore: a titanium protection frame is arranged around the silicon carbide heating plate.

[0027] The beneficial effects of adopting the above technical solution are:

[0028] A titanium protection frame is set up to prevent the experimental environment from being corroded by highly corrosive liquids.

[0029] The beneficial effects of the utility model are:

[0030] The utility model adopts a temperature safety control device to control the safe heating of the electric heating plate. The input voltage of the adjustable thyristor is adjusted by a regulator, and the voltage and current values ​​of the AC contactor are monitored in real time by a current and voltage dual display, so as to judge the output power of the AC contactor, and control the heating temperature of the electric heating plate by controlling the output power. The safe operation of the temperature safety control device is guaranteed by setting a circuit breaker. A variety of options are provided so that the adjustment function of the regulator is more in line with the experimental scenario. By setting a temperature safety control device, the heating temperature of the electric heating plate can be adjusted, and it also has a protective effect. The use of a silicon carbide heating plate reduces costs from the source and can achieve the same heating effect. The experimental environment is prevented from being corroded by highly corrosive liquids by setting a titanium protection frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a circuit diagram of an electric heating device;

[0032] Among them, 1. Adjustable thyristor; 2. Regulator; 3. Circuit breaker; 4. Electric heating plate; 5. Switch; 6. Current and voltage dual display meter; 7. AC contactor. DETAILED DESCRIPTION

[0033] The following are only preferred specific embodiments of the utility model, but the protection scope of the utility model is not limited to them. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed by the utility model should be included in the protection scope of the utility model. The embodiments described below are only used to explain the utility model and cannot be interpreted as limitations on the utility model. The protection scope of the utility model should be based on the protection scope of the claims. The embodiments of the utility model are described in detail below. In order to facilitate the description of the utility model and simplify the description, the technical terms used in the specification of the utility model should be interpreted in a broad sense, including but not limited to conventional replacement schemes not mentioned in this application, and also including direct implementation methods and indirect implementation methods.

[0034] Example 1

[0035] Combination Figure 1To illustrate this embodiment, a temperature safety control device for an electric heating plate disclosed in this embodiment includes an adjustable thyristor 1, a regulator 2, a current and voltage dual display 6 and an AC contactor 7, wherein the output end of the regulator 2 is connected to the input end of the adjustable thyristor 1, the output end of the adjustable thyristor 1 is connected to the input end of the AC contactor 7, the output end of the AC contactor 7 is connected to the input end of the electric heating plate 4, and the input end of the current and voltage dual display 6 is connected to the output end of the AC contactor 7.

[0036] The regulator 2 is used to control the output voltage of the adjustable thyristor 1, thereby adjusting the output power of the AC contactor, and then controlling the heating temperature of the electric heating plate 4. The heating temperature of the electric heating plate 4 is calculated based on the output voltage and current of the AC contactor measured by the current and voltage dual display meter 6, that is, power = current * voltage. The values ​​of the current and voltage are displayed in real time on the current and voltage dual display meter 6.

[0037] The functional relationship between current and voltage: y = 15.317x + 0.7455;

[0038] The functional relationship between voltage and temperature: y = 2.3892x-5.9172;

[0039] Temperature is measured by thermometer, and the corresponding relationship table of specific parameters is as follows:

[0040] Table 1 Parameters

[0041] Current 1.5 3.1 4.1 6.5 7.9 10.6 13.1 14.0 14.3 Voltage 24 48 63 100 122 165 200 215 220 temperature 54 106 258 231 285 393 470 504 520 power 36 149 145 650 964 1749 2620 3010 3146

[0042] The adjustable thyristor 1, i.e., a thyristor rectifier or a thyristor, is based on the unidirectional conductivity of the PN junction. To make the adjustable thyristor 1 conductive, two conditions need to be met: one is to apply a forward voltage between its anode A and cathode K; the other is to connect the output end of the regulator 2 between its control electrode G and cathode K, thereby forming a forward trigger voltage. When both conditions are met, the adjustable thyristor 1 will conduct current, thereby supplying voltage to the AC contactor, and the adjustable thyristor 1 can be controlled to output different voltages by controlling the opening of the regulator 2. Once the adjustable thyristor 1 is turned on, even if the trigger voltage is removed, it will still maintain the conductive state until the anode current drops to zero, thereby avoiding damage caused by a sudden power failure of the electric heating plate 4. At the same time, the advantages of the adjustable thyristor 1 include high stability, good reliability, fast response speed, etc.

[0043] Example 2

[0044] This embodiment is explained in conjunction with Example 1. The temperature safety control device for an electric heating plate disclosed in this embodiment further includes a circuit breaker 3, which is arranged between the AC contactor 7 and the electric heating plate. By arranging the circuit breaker 3, it is avoided that the circuit is damaged when an abnormal situation such as a short circuit or overload occurs in the circuit, thereby improving the safety and reliability of the temperature safety control device.

[0045] Example 3

[0046] This embodiment is described in conjunction with Example 1. This embodiment discloses a temperature safety control device for an electric heating plate, which further includes a switch 5, the output end of which is connected to the input end of the AC contactor 7. The switch 5 is a two-speed knob switch. The AC contactor is powered on and off by the two-speed knob switch. When the AC contactor is powered on, the regulator 2 can adjust the input voltage of the adjustable thyristor 1.

[0047] Example 4

[0048] This embodiment is explained in conjunction with Example 1. This embodiment discloses a temperature safety control device for an electric heating plate, wherein the regulator 2 is a rotary knob, a sliding switch or a rheostat.

[0049] Example 5

[0050] This embodiment is described in conjunction with Example 1. This embodiment discloses an electric heating device, including a temperature safety control device and an electric heating plate 4, wherein the output end of the temperature safety control device is connected to the input end of the electric heating plate 4. The electric heating plate 4 is a silicon carbide heating plate. A titanium protection frame is arranged around the silicon carbide heating plate. The silicon carbide heating plate is connected to an AC contactor 7 via a circuit breaker 3.

[0051] The operating steps of the electric heating device are as follows:

[0052] S1, close circuit breaker 3,

[0053] S2, turn on the second gear knob switch 5

[0054] S3, rotate the regulator 2 on the adjustable thyristor 1. If a sliding switch or a rheostat is selected, the current can be adjusted to control the heating temperature of the silicon carbide heating plate.

[0055] The current and voltage dual display 6 is connected to the AC contactor 7 (220V 50A). When the rotary knob on the adjustable thyristor 1 is rotated, different currents and voltages are displayed on the current and voltage dual display 6. The product of the current and voltage is the power of the silicon carbide heating plate at this time. By controlling different powers, the heating temperature of the silicon carbide heating plate is indirectly adjusted. The temperature safety control device composed of the components is adjustable in temperature on the one hand, and on the other hand, the safe use of the entire device is achieved through the combination of the three components of the circuit breaker 3, the adjustable thyristor 1, and the second-gear knob switch 5. At the same time, while retaining the low price advantage of the silicon carbide electric heating plate 4, the temperature control function is also added, so that the precious metal experiment can be carried out smoothly. At the same time, in order to avoid the corrosion of the electric heating equipment by highly corrosive liquid medicines such as aqua regia, a titanium protection frame is used to be externally placed around the electric heating plate 4 to protect the possible corrosion in all directions, thereby ensuring that the experiment is not contaminated.

Claims

1. A temperature safety control device for an electric heating plate, characterized in that: The invention comprises an adjustable thyristor (1), a regulator (2), a current and voltage dual display (6) and an AC contactor (7), wherein the output end of the regulator (2) is connected to the input end of the adjustable thyristor (1), the output end of the adjustable thyristor (1) is connected to the input end of the AC contactor (7), the output end of the AC contactor (7) is connected to the input end of an electric heating plate (4), and the input end of the current and voltage dual display (6) is connected to the output end of the AC contactor (7).

2. The electric heating plate temperature safety control device according to claim 1, characterized in that: It also comprises a circuit breaker (3), wherein the circuit breaker (3) is arranged between the AC contactor (7) and the electric heating plate (4).

3. The temperature safety control device for an electric heating plate according to claim 1, characterized in that: It also comprises a switch (5), the output end of the switch (5) being connected to the input end of the AC contactor (7).

4. The temperature safety control device for an electric heating plate according to claim 3, characterized in that: The switch (5) is a two-speed rotary switch.

5. The electric heating plate temperature safety control device according to claim 1, characterized in that: The regulator (2) is selected from a rotary knob, a slide switch or a rheostat.

6. An electric heating device, characterized in that: It comprises a temperature safety control device as claimed in any one of claims 1 to 5 and an electric heating plate (4), wherein the output end of the temperature safety control device is connected to the input end of the electric heating plate (4).

7. An electric heating device according to claim 6, characterized in that: The electric heating plate (4) is a silicon carbide heating plate.

8. An electric heating device according to claim 7, characterized in that: A titanium protection frame is arranged around the silicon carbide heating plate.

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