Constant-power heating system

Abstract

The utility model discloses a constant power heating system, comprising a heating wire module and an indication module, the heating wire module comprises 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 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 voltage at the two ends of the indication module changes when the heating wire module is damaged, the indication lamp is extinguished or brighter, so that the heating wire module is effectively indicated to have a problem, an operator can conveniently replace or maintain the heating wire module in time, and the service life of the heating wire module is prolonged. And normal use is prevented from being influenced.

Description

Technical Field

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

[0002] The constant power heating field includes products such as constant power heating cables, carbon fiber heating wires, and electric heating films, collectively referred to as heating wires. Heating wires are commonly used in various fields to effectively increase the temperature of spaces, equipment, pipelines, and more. At the same time, 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 wires are broken. To this end, people usually use the on and off status of indicator lights to determine the working status of the heating wires.

[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. Therefore, 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 neutral wire. In this way, if the heating wire is disconnected at some point, the heating wire will not work. However, because the live and neutral wires on both sides of the indicator light still have power and can still light up, the indicator light can only reflect the power-on state and cannot indicate the working status of the heating wire. This will seriously affect the operator's accurate judgment of the working status of the heating wire, and the temperature of the corresponding target to be heated cannot be achieved as expected. Utility Model Content

[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 that can be equipped with a detection prompt circuit connected in parallel to a certain heating wire unit, thereby solving the problem of accurate detection of whether the heating wire is broken in the constant power heating field, facilitating 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 being connected in series, and the heating wire units being used for constant power electric heating;

[0008] An indication module is connected in parallel to the heating wire unit. The indication module includes: an indicator light and a current-limiting resistor connected in series. The value of the current-limiting resistor is much larger than the equivalent resistance value of the heating wire. The indicator light is a neon lamp.

[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 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, it further includes: a voltage acquisition module and a relay module, the voltage acquisition module is electrically connected to the relay module, the voltage acquisition module is connected in series to the circuit where the indication module is located, the voltage acquisition module is used to monitor the voltage changes on the indication module, and the relay module is connected in parallel to the indication module. Beneficial effects

[0015] The utility model combines a heating wire module and an indicator module, and utilizes the law that the voltage at both ends of the indicator module will change 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

[0016] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0017] Figure 1 Schematic diagram of a constant power heating system according to Example 1 of the present utility model;

[0018] Figure 2 This is an equivalent electrical schematic diagram according to Example 2 of the present utility model;

[0019] Figure 3 This is an equivalent electrical schematic diagram according to Example 3 of the present utility model;

[0020] Figure 4 This is an equivalent electrical schematic diagram according to Example 4 of the present utility model. DETAILED DESCRIPTION

[0021] 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 limit 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 considered as part of the specification. Example 1

[0022] Combine Figure 1 As shown, a constant power heating system 100 of an embodiment of the present invention comprises at least: a heating wire module and an indicator module, wherein the heating wire module comprises at least two heating wire units, two adjacent heating wire units are connected in series, the indicator module is connected in parallel to a certain heating wire unit, and the indicator module comprises an indicator light and a current-limiting resistor connected in series, wherein the value of the current-limiting resistor is much greater than the equivalent resistance value of the heating wire unit. It should be noted that the resistance of the heating wire unit cannot generally be completely ignored, but when the value of the current-limiting resistor is large, it is large enough to ignore the resistance of the heating wire unit so that the changing voltage can be fully applied to the indicator light circuit. In actual use, it can be set based on experience, for example, to 10 times or even more than 10 times.

[0023] Furthermore, it should be noted that the heating wire unit can be composed of a single independent heating wire or at least two heating wires connected in series. Thus, the heating wire unit herein can be a portion of a single heating wire or a single independent heating wire. Furthermore, the heating wire unit in this embodiment and the heating wire units in the following embodiments are equivalent to the heating unit in the accompanying drawings.

[0024] Specifically, when the heating wire unit is a part of a constant power heating wire, one end of the indicator 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.

[0025] Similarly, when the heating wire unit is an independent constant power heating wire, one end of the indicator 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.

[0026] When using, Figure 1 As shown, when the heating wire module is not damaged, the indicator light works normally and is in the lighted state.

[0027] When there is a short circuit between sections 1 and 2 of the heating wire module, the indicator light and sections 2 and 3 of the heating wire module have no voltage, and the indicator light will not light up. Therefore, the on / off status of the indicator light connected in parallel to the heating unit can be used to visually observe whether the heating wire module is damaged.

[0028] When a short circuit occurs between sections ② and ③ of the heater module, the voltage across the indicator module changes from the normal value of U*R2 / (R1+R2) to U because the equivalent resistance of heating unit 1 is much smaller than the current-limiting resistor of the indicator module. At this point, the indicator light will be brighter than normal and may even appear to burn out. This allows for intuitive identification of heater module damage. Example 2

[0029] 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, the rated voltage of the transient voltage diode is selected to be between 120V and 210V.

[0030] When the heater 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. Therefore, the voltage across the indicator light and the current-limiting resistor RL is 110V, and the LED lights up, indicating that the heater wire is working normally.

[0031] When sections ① and ② (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.

[0032] 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 consisting 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, making the neon lamp brighter.

[0033] 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 location of the disconnection in the parallel output heating wire module.

[0034] Furthermore, 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 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 normal voltage, and the lamp 1 and the lamp 2 are lit normally.

[0035] 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 turns on, indicating that heating unit 1 is damaged.

[0036] 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.

[0037] Therefore, this embodiment utilizes the rule that the voltage on the indicator light changes when the heating wire unit is damaged, and judges the status of different indicator lights to determine the position of the disconnection in the heating wire module. Example 3

[0038] In this embodiment, based on Example 1, the indicator module further includes an overload protector and an overvoltage protector. The overload protector is connected in series with the indicator light and the current-limiting resistor, and the overvoltage protector is connected in parallel with the indicator light and the current-limiting resistor. Specifically, in this embodiment, the indicator light can be an LED or a neon lamp, and the overvoltage protector can be a transient voltage diode (transient voltage suppressor diode) or a varistor. When the voltage on the overvoltage protector exceeds its rated voltage, it activates and causes a high current to flow. The overload protector can be a fuse or a fuse resistor. Under normal circumstances, it functions as an ordinary resistor. If a circuit fault occurs and the rated current is exceeded, it will fuse within a specified time, thereby protecting other components.

[0039] Therefore, by using the combination of the overload protection component 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.

[0040] Specifically, as Figure 3 Taking the equivalent electrical schematic diagram shown in FIG2 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 and 210V.

[0041] When the heater cable 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. Therefore, the voltage across the indicator light and the current-limiting resistor RL is 110V, and the LED lights up, indicating that the heater cable is working normally.

[0042] When sections ① and ② (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.

[0043] When sections ② and ③ (R2) of the heating wire module are open, the voltage across the indicator light circuit (equivalent to R2) rises from 110V to 220V because the equivalent resistance of heating wire R1 is much smaller than that of the indicator light. Since fuse F1 does not divide the voltage, the voltage across the series circuit consisting of the indicator light and current-limiting resistor RL also rises from 110V to 220V. Obviously, the 220V voltage exceeds the rated voltage of transient voltage diode D1, causing transient voltage diode D1 to activate and generate a current exceeding 10A. This current exceeds the rated current of fuse F1, causing it to melt, resulting in a loss of voltage across the indicator light, which then goes dark, indicating damage to the heating wire module.

[0044] Therefore, through the combination of the indicator 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 there is no damage, so that the indicator light can be turned off by utilizing the voltage change, and then it can be intuitively observed whether the heating wire module is damaged. Example 4

[0045] like Figure 4 As shown, a constant power heating system 100 of an embodiment of the utility model also includes a control module, a power supply module, a voltage acquisition module, and a display module, wherein the control module includes a relay module, the power supply module draws power from the power supply to convert it into a DC low voltage that can be used by the MCU, the voltage acquisition module measures the voltage at point ②, and the display module is used to indicate whether the heating unit 1 and the heating unit 2 are in the heating status.

[0046] Specifically, the voltage acquisition module is electrically connected to the relay module, the voltage acquisition module is connected in series to the circuit where the indication module is located, the voltage acquisition module is used to monitor the voltage change on the indication module, and the relay module is connected in parallel to the indication module.

[0047] 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.

[0048] 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 wire module can work normally.

[0049] When heating unit 2 is damaged, the voltage measured by the voltage acquisition module at point ② 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 wire module can work normally.

[0050] 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 to 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 device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation to the present invention.

[0051] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "example," "specific example," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0052] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and purpose 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 being connected in series, and the heating wire units being used for constant power electric heating; An indication module is connected in parallel to the heating wire unit. The indication module includes: an indicator light and a current-limiting resistor connected in series. The value of the current-limiting resistor is much larger than the equivalent resistance value of the heating wire unit. The indicator light is a neon lamp.

2. A constant power heating system according to claim 1, characterized in that: The indicating module is connected in parallel to each of the heating wire units.

3. 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 indicator light and the current-limiting resistor.

4. A constant power heating system according to claim 3, characterized in that: The overvoltage protector is a transient voltage diode or a varistor.

5. A constant power heating system according to claim 3, characterized in that: The overload protection component is a fuse or a fuse resistor.

6. A constant power heating system according to any one of claims 3 to 5, 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.

7. The 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 acquisition module is connected in series to the circuit where the indication module is located, the voltage acquisition 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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