Constant-power heating system

Abstract

A constant-power heating system disclosed by the present invention comprises a heating wire module and an indication module, the heating wire module comprises at least two heating wire units, the two adjacent heating wire units are connected in series, and the heating wire units are used for constant-power electric heating; the indication module is connected to the heating wire unit in parallel, the indication module comprises an indication lamp and a current-limiting resistor which are sequentially connected in series, and the numerical value of the current-limiting resistor is far greater than the numerical value of the equivalent resistance of the heating wire. Therefore, through the combination of the heating wire module and the indication module and the utilization of the rule that the voltages at the two ends of the indication module can change when the heating wire module is damaged, the indication lamp is turned off or brighter, so that the heating wire module is effectively indicated to have a problem, and an operator can conveniently replace or maintain the heating wire module in time; and normal use is prevented from being influenced.

Description

Technical Field

[0001] The invention relates to the technical field of electric heating, in particular to a constant power heating system. Background Art

[0002] In the field of constant power heating, there are constant power heating cables, carbon fiber heating wires, electric heating films and other products, collectively referred to as heating wires. Heating wires are usually used in various fields, which can effectively increase the temperature of space areas, equipment, pipelines, etc. At the same time, in order to ensure the normal operation of the heating system and provide a safe and stable environment, it is often necessary to monitor whether the heating wire is broken. For this reason, people usually use the on and off status of the indicator light to judge the working status of the heating wire.

[0003] Since the resistance of the heating wire is relatively small, the current flowing through it can be as high as several amperes or even tens of amperes, while the equivalent resistance of the indicator light is much larger than the resistance of the heating wire and can only withstand a current of milliamperes, so it is difficult to use it in series with the heating wire.

[0004] If the indicator light is directly connected in parallel to the heating wire, that is, one end of the indicator light is connected to the joint between the power line and the heating wire, and the other end is connected to the live wire and the neutral wire. In this way, when the heating wire is disconnected at a certain point, the heating wire will not work, but because the live and neutral wires on both sides of the indicator light are still powered, they can still light up, so that the indicator light can only reflect the power-on state, and cannot indicate the working state of the heating wire, which will seriously affect the operator's accurate judgment of the working state of the heating wire, resulting in the temperature of the corresponding target to be heated failing to achieve the expected setting. Summary of the invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a constant power heating system, which can be provided with a detection prompt circuit and connected in parallel to a certain heating wire unit, thereby solving the problem of accurately detecting whether the heating wire is broken in the field of constant power heating, which is convenient for rapid repair or replacement.

[0006] A constant power heating system according to an embodiment of the present invention includes:

[0007] A heating wire module, the heating wire module comprising at least two heating wire units, two adjacent heating wire units are connected in series, and the heating wire units are used for constant power electrical heating;

[0008] An indication module is connected in parallel to the heating wire unit, and comprises: an indicator light and a current-limiting resistor connected in series in sequence, wherein the value of the current-limiting resistor is much greater than the equivalent resistance value of the heating wire.

[0009] According to some embodiments of the present invention, the indication module further includes: an overload protection component and an overvoltage protector, the overload protection component is connected in series with the indicator light and the current limiting resistor, and the overvoltage protector is connected in parallel with the first indicator light and the current limiting resistor.

[0010] According to some embodiments of the present invention, the overvoltage protector is a transient voltage diode or a varistor.

[0011] According to some embodiments of the present invention, the overload protection component is a fuse or a fuse resistor.

[0012] According to some embodiments of the present invention, the indicator light is an LED light.

[0013] According to some embodiments of the present invention, the rated current of the overload protection component is less than 10A, the rated voltage of the indicator light is 110V, and the rated voltage range of the overvoltage protector is 120V-210V.

[0014] According to some embodiments of the present invention, the indicator light is a neon lamp.

[0015] Beneficial effects:

[0016] The present invention combines a heating wire module and an indicator module and utilizes the rule that the voltage at both ends of the indicator module changes when the heating wire module is damaged, so that the indicator light goes out or becomes brighter, thereby effectively indicating that there is a problem with the heating wire module, making it convenient for operators to replace or repair it in time to avoid affecting normal use. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0018] Figure 1 is a schematic diagram of a constant power heating system according to Example 1 of the present invention;

[0019] Figure 2 is an equivalent electrical schematic diagram according to Embodiment 2 of the present invention;

[0020] Figure 3 is an equivalent electrical schematic diagram according to Embodiment 3 of the present invention;

[0021] Figure 4 is an equivalent electrical schematic diagram according to Example 4 of the present invention. DETAILED DESCRIPTION

[0022] The following is a clear and complete description of the technical solutions in the embodiments of the present disclosure in conjunction with the drawings in the embodiments disclosed in this application. The description of the embodiments is actually only illustrative and exemplary, and does not serve as any limitation to the present disclosure and its application or use; based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in this field without carrying out creative work should fall within the scope of protection of the present disclosure. In addition, the technologies, methods and equipment known to ordinary technicians in the relevant fields may not be discussed in detail, but where appropriate, the technologies, methods and equipment should be regarded as part of the specification.

[0023] Example 1

[0024] Combination Figure 1 As shown, a constant power heating system 100 of an embodiment of the present invention at least includes: a heating wire module and an indication module, wherein the heating wire module includes at least two heating wire units, two adjacent heating wire units are connected in series, the indication module is connected in parallel to a certain heating wire unit, and the indication module includes an indicator light and a current limiting resistor connected in series in sequence, and the value of the current limiting resistor is much larger than the equivalent resistance value of the heating wire unit. It should be noted that the resistance of the heating wire unit generally cannot be completely ignored, but when the value of the current limiting resistor is very large, it is large enough to ignore the resistance of the heating wire unit, so that the changing voltage can be fully added to the indicator light circuit. In actual use, it can be set according to experience, for example, set to 10 times or even more than 10 times.

[0025] In addition, it should be noted that the heating wire unit can be composed of an independent heating wire or at least two heating wires connected in series, so the heating wire unit here can be a part of a heating wire or an independent heating wire. At the same time, the heating wire unit in this embodiment and the heating wire unit in the following embodiments are equivalent to the heating unit in the drawings.

[0026] Specifically, when the heating wire unit is a part of the constant power heating wire, at this time, one end of the indicating module is connected to any position on the heating wire module, and the other end is connected to the neutral wire or the live wire.

[0027] Similarly, when the heating wire unit is an independent constant power heating wire, at this time, one end of the indicating module is connected to the connection between adjacent heating wire units, and the other end is connected to the neutral wire or the live wire.

[0028] When using, Figure 1 As shown, when the heating wire module is not damaged, the indicator light works normally and is in a lit state.

[0029] When there is a short circuit between the ① and ② sections of the heating wire module, there is no voltage in the indicator light and the ② and ③ sections of the heating wire module, and the indicator light is off. Therefore, the damage of the heating wire module can be visually observed by the on or off state of the indicator light connected in parallel on the heating unit.

[0030] When there is a short circuit between the ② and ③ sections of the heating wire module, since the equivalent resistance of the heating unit 1 is much smaller than the current limiting resistance of the indicator module, the voltage of the indicator module changes from the normal U*R2 / (R1+R2) to U. At this time, the indicator light will be brighter than normal, and even burn out. This allows you to intuitively observe whether the heating wire module is damaged.

[0031] Example 2

[0032] Preferably, based on the above embodiment, the indicator light is a neon lamp. Specifically, assuming that the power supply voltage U=220V, the resistance value of the heating wire R1 is 11Ω, the resistance value of the heating wire R2 is also 11Ω, and the series circuit of the indicator light and the current limiting resistor RL is designed to be 110V, and the rated voltage of the transient voltage diode is selected to be between 120V-210V.

[0033] When the heating wire is intact and powered on, because R1=R2=11Ω, the voltage across the indicator light and R2 is 110V. At this time, the transient voltage diode D1 (overvoltage protector, the same below) does not work, and the fuse F1 (overload protection component, the same below) does not divide the voltage, so the voltage across the indicator light and the current limiting resistor RL is 110V, and the LED lights up, indicating that the heating wire is working normally.

[0034] When the ① and ② sections (R1) of the heating wire module are broken, there is no voltage between the indicator light and R2. At this time, the indicator light is off, indicating that the heating wire module is damaged.

[0035] When sections ② and ③ (R2) of the heating wire module are broken, since the resistance of the current limiting resistor RL is 10 times that of R1, the voltage across the series circuit composed of the indicator light and the current limiting resistor RL rises from 110V to 220V. At this time, the current flowing through the neon lamp increases, thereby making the neon lamp brighter.

[0036] Therefore, this embodiment utilizes the rule that the voltage on the indicator light changes when the heating wire unit is damaged, so that the indicator light becomes brighter, thereby being able to accurately indicate the position where the disconnection occurs in the parallel output heating wire module.

[0037] Further, as an alternative to the above solution, Figure 2As shown, in a constant power heating system 100 of an embodiment of the present invention, an indication module can also be connected in parallel to each heating wire unit. At this time, when the heating unit 1 and the heating unit 2 are working normally, the voltage between ①-② and ②-③ is a normal voltage, and the lamp 1 and the lamp 2 are lit normally.

[0038] When heating unit 1 is damaged, the voltage between ①-② is U, the voltage between ②-③ is 0, light 2 goes out, and light 1 becomes bright, indicating that heating unit 1 is damaged.

[0039] When heating unit 2 is damaged, the voltage between ①-② is 0, the voltage between ②-③ is U, light 1 goes out, and light 2 turns on, indicating that heating unit 2 is damaged.

[0040] Therefore, this embodiment utilizes the rule that the voltage on the indicator light changes when the heating wire unit is damaged, and judges the states of different indicator lights to determine the position where the disconnection occurs in the heating wire module.

[0041] Example 3

[0042] In this embodiment, on the basis of embodiment 1, the indication module further includes an overload protection component and an overvoltage protector, wherein the overload protection component is connected in series with the indicator light and the current limiting resistor, and the overvoltage protector is connected in parallel with the first indicator light and the current limiting resistor. Specifically, in this embodiment, the indicator light can be an LED lamp or a neon lamp, and the overvoltage protector can be a transient voltage diode (transient voltage suppression diode) or a varistor. When the voltage on the overvoltage protector exceeds its rated voltage, it starts to work and causes a large current. The overload protection component can be a fuse or a fuse resistor, which has the function of an ordinary resistor under normal circumstances. Once a circuit fails and exceeds its rated current, it can be fused within a specified time, thereby achieving the function of protecting other components.

[0043] Therefore, by utilizing the combination of the overload protection device and the overvoltage protector, when sections ② and ③ of the heating wire module are broken, the indicator light is directly connected to the live wire through sections ① and ② of the heating wire module, exceeding the normal voltage, but the indicator light does not light up.

[0044] Specifically, Figure 3 Taking the equivalent electrical schematic diagram shown as an example, in this embodiment, the power supply voltage U=220V, the resistance value of the heating wire R1 is 11Ω, the resistance value of the heating wire R2 is also 11Ω, the current parameter of the fuse F1 is selected to be less than 10A, and the series circuit of the indicator lamp and the current limiting resistor RL is designed to be 110V, and the rated voltage of the transient voltage diode is selected to be between 120V-210V.

[0045] When the heating wire is intact and powered on, because R1=R2=11Ω, the voltage between ②-③ is 110V. At this time, the transient voltage diode D1 (overvoltage protector, the same below) does not work, and the fuse F1 (overload protection component, the same below) does not divide the voltage, so the voltage across the indicator light and the current limiting resistor RL is 110V, and the LED lights up, indicating that the heating wire is working normally.

[0046] When the ① and ② sections (R1) of the heating wire module are broken, there is no voltage between the indicator light and R2. At this time, the indicator light is off, indicating that the heating wire module is damaged.

[0047] When the ② and ③ sections (R2) of the heating wire module are broken, the voltage across the indicator light circuit (equivalent to R2) rises from 110V to 220V because the equivalent resistance value of the heating wire R1 is much smaller than that of the indicator light. Since the fuse F1 does not divide the voltage, the voltage across the series circuit consisting of the indicator light and the current limiting resistor RL also rises from 110V to 220V. Obviously, the 220V voltage will exceed the rated voltage of the transient voltage diode D1, so the transient voltage diode D1 works and generates a current of more than 10A, which exceeds the rated current of the fuse F1, so the fuse F1 is blown, resulting in no voltage across the indicator light, and the indicator light is not on, which indicates that the heating wire module is damaged.

[0048] Therefore, through the combination of the indication module, when the heating wire unit is damaged, the voltage at both ends of the indicator light connected in parallel with the heating wire unit will be different from that when it is not damaged, so that the indicator light can be turned off by utilizing the voltage change, and whether the heating wire module is damaged can be intuitively observed.

[0049] Example 4

[0050] like Figure 4 As shown, a constant power heating system 100 of an embodiment of the present invention also includes a control module, a power module, a voltage acquisition module, and a display module, wherein the control module includes a relay module, the power module draws power from a power source to convert it into a DC low voltage that can be used by the MCU, the voltage acquisition module measures the voltage at ②, and the display module is used to indicate whether the heating unit 1 and the heating unit 2 are in the heating status.

[0051] Specifically, the voltage acquisition module is electrically connected to the relay module, the voltage detection module is connected in series to the circuit where the indication module is located, the voltage detection module is used to monitor the voltage change on the indication module, and the relay module is connected in parallel to the indication module.

[0052] When heating unit 1 and heating unit 2 are not damaged, the voltage measured by the voltage acquisition module at point ② is normal, and lights 1 and 2 of the display module are both on.

[0053] When heating unit 1 is damaged, the voltage measured by the voltage acquisition module at point ② is 0, and the display module light 1 is off, indicating that heating unit 1 is not heating. At this time, the control module 1 works the switching circuit so that sections ② and ③ of the heating line module can work normally.

[0054] When the heating unit 2 is damaged, the voltage at point ② measured by the voltage acquisition module is U, and the display module light 2 is off, indicating that the heating unit 2 is not heating. At this time, the control module 2 works the switching circuit so that sections ① and ② of the heating line module can work normally.

[0055] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0056] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" 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 present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example.

[0057] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A constant power heating system, characterized in that: include: A heating wire module, the heating wire module comprising at least two heating wire units, two adjacent heating wire units are connected in series, and the heating wire units are used for constant power electrical heating; An indication module is connected in parallel to the heating wire unit, and comprises: an indicator light and a current-limiting resistor connected in series in sequence, wherein the value of the current-limiting resistor is much larger than the equivalent resistance value of the heating wire unit.

2. A constant power heating system according to claim 1, characterized in that: The indicator light is a neon lamp.

3. A constant power heating system according to claim 2, characterized in that: The indicating module is connected in parallel to each of the heating wire units.

4. A constant power heating system according to claim 1, characterized in that: The indication module further includes: an overload protection component and an overvoltage protector. The overload protection component is connected in series with the indicator light and the current-limiting resistor. The overvoltage protector is connected in parallel with the first indicator light and the current-limiting resistor.

5. A constant power heating system according to claim 4, characterized in that: The overvoltage protector is a transient voltage diode or a varistor.

6. A constant power heating system according to claim 4, characterized in that: The overload protection component is a fuse or a safety resistor.

7. A constant power heating system according to any one of claims 4 to 6, characterized in that: The rated current of the overload protection component is less than 10A, the rated voltage of the indicator light is 110V, and the rated voltage range of the overvoltage protector is 120V-210V.

8. A constant power heating system according to claim 1, characterized in that: Also includes: A voltage acquisition module and a relay module, wherein the voltage acquisition module is electrically connected to the relay module, the voltage detection module is connected in series to the circuit where the indication module is located, the voltage detection module is used to monitor the voltage changes on the indication module, and the relay module is connected in parallel to the indication module.

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