Heating device and high-temperature aging oven

Abstract

The utility model discloses a heating device and a high-temperature aging oven. The heating device comprises a power supply module, a circuit breaker, a control module with a touch screen, a start button, a first relay, a second relay, a first heating element, a second heating element and a first detection element. The output end of the power module is connected with the wire inlet end of the circuit breaker, the wire outlet end of the circuit breaker is connected with the power end of the control module, a contact of the first relay and a contact of the second relay, the contact of the first relay is further connected with the first heating element, and the contact of the second relay is further connected with the second heating element. Coils of the first detection element, the start button, the first relay and the second relay are respectively connected with the control module; the power of the first heating element is five times or more than five times that of the second heating element. According to the utility model, high-precision heating is realized under the condition that the heating speed is ensured.

Description

Technical Field

[0001] This utility model belongs to the field of heating control technology, and in particular relates to a heating device and a high-temperature aging chamber. Background Technology

[0002] When testing wires and cables, the high-temperature aging test is one of the most important tests. After aging, high-temperature winding tests and tensile tests are required to determine whether the insulation material meets national standards.

[0003] Currently, most natural ventilation high-temperature aging chambers use LED-display temperature control devices for heating. The specific control process is as follows: a target temperature is set via LEDs, heating starts based on this temperature, and stops when the target temperature is reached; heating resumes when the temperature drops below the target temperature, and this cycle continues to maintain the temperature inside the chamber near the target. This heating control method provides a constant heating power. Higher heating power results in faster heating speeds but lower heating precision; conversely, lower heating power provides higher precision but slower heating speeds, making it impossible to achieve both fast and high-precision heating simultaneously. Furthermore, the chamber body of natural ventilation high-temperature aging chambers is typically made of 201 stainless steel, which has certain high-temperature resistance up to 315℃. Above 315℃, heavy metals in the material will leach out. Therefore, the maximum temperature of existing natural ventilation high-temperature aging chambers is usually only 300℃. However, some special cables, especially those used in aerospace applications, have higher temperature requirements for high-temperature aging, and existing natural ventilation high-temperature aging chambers cannot meet these requirements. Utility Model Content

[0004] The purpose of this invention is to provide a heating device and a high-temperature aging chamber to solve at least one of the problems of existing high-temperature aging chambers being unable to achieve high-precision heating while maintaining high heating speed, and being unable to meet the aging requirements of special cables.

[0005] This utility model solves the above-mentioned technical problems through the following technical solution: a heating device, including a power module, a circuit breaker, a control module with a touch screen, a start button, a first relay, a second relay, a first heating element, a second heating element, and a first detection element for detecting the ambient temperature of the first and second heating elements; the output terminal of the power module is connected to the input terminal of the circuit breaker, and the output terminal of the circuit breaker is connected to the power terminal of the control module, the contacts of the first and second relays, the contacts of the first relay are also connected to the first heating element, and the contacts of the second relay are also connected to the second heating element; the coils of the first detection element, the start button, the first relay, and the second relay are respectively connected to the control module; the power of the first heating element is five times or more the power of the second heating element.

[0006] When the circuit breaker is closed to connect the power supply, the initial target temperature and the final target temperature are set via the touch screen. The initial target temperature is slightly lower than the final target temperature. When the start button is pressed, the control module energizes the coils of the first and second relays (or only the coil of the first relay is energized), and the contacts of the first and second relays close (or only the contacts of the first relay are closed). The first heating element and the second heating element start working (or only the first heating element works), and heating is initiated. When the temperature detected by the first detection element reaches the initial target temperature, the control module de-energizes the coil of the first relay, the contacts of the first relay open, the first heating element stops working, and only the second heating element works until the temperature detected by the first detection element reaches the final target temperature, at which point the second heating element stops working.

[0007] Furthermore, the heating device also includes a fuse, an indicator light, and a third relay. The fuse, the contacts of the third relay, and the indicator light form a series branch. The coil of the third relay is connected to the control module, and the series branch is connected to the output terminal of the circuit breaker.

[0008] Furthermore, the heating device also includes a second detection element, a fourth relay, and a contactor for detecting the voltage at the output terminal of the circuit breaker; the coils of the second detection element and the fourth relay are respectively connected to the control module, the normally closed contact of the fourth relay is connected in series in the series branch, the coil of the contactor is connected in parallel to both ends of the indicator light, and the contactor is located between the output terminal of the circuit breaker and the contacts of the first and second relays.

[0009] Furthermore, the second detection element is connected to the control module via RS485.

[0010] Furthermore, the heating device also includes a fifth relay and a cooler; the coil of the fifth relay is connected to the control module, and the contacts of the fifth relay are connected to the output terminal of the circuit breaker and the cooler.

[0011] Furthermore, the heating device also includes a third detection element connected to the control module, the third detection element being used to detect the ambient temperature of the first heating element and the second heating element.

[0012] Furthermore, the first heating element and the second heating element are heating resistors.

[0013] Furthermore, the heating device also includes an alarm, which is connected to the control module.

[0014] Based on the same concept, this utility model also provides a high-temperature aging chamber, which includes a chamber body and a heating device as described above, wherein the first heating element, the second heating element and the first detection element of the heating device are disposed in the chamber body.

[0015] Furthermore, the box body is made of 316 stainless steel; an insulation layer is provided on the inner wall of the box body; a sealing strip is provided around the door of the box body; and reinforcing ribs are provided on the inner side of the door of the box body.

[0016] Furthermore, the insulation layer is made of ultrafine glass wool, and the sealing strip is made of polytetrafluoroethylene asbestos rope.

[0017] Beneficial effects

[0018] Compared with the prior art, the advantages of this utility model are:

[0019] The heating device provided by this utility model first rapidly heats the material to the initial target temperature using a high-power first heating element or a first heating element and a second heating element, and then heats it from the initial target temperature to the final target temperature using a low-power second heating element, thus ensuring heating accuracy and achieving high-precision heating while ensuring heating speed.

[0020] The high-temperature aging chamber provided by this utility model is made of 316 stainless steel, which can withstand high temperatures up to 1200℃, and can meet the high-temperature aging requirements of special cables. Attached Figure Description

[0021] To more clearly illustrate the technical solution of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only one embodiment of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the heating device in an embodiment of this utility model. Detailed Implementation

[0023] The technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0024] Example 1

[0025] like Figure 1As shown, the heating device provided in this embodiment of the present invention includes a power supply module, a circuit breaker QF, a control module with a touch screen, a start button SB, a first relay, a second relay, a first heating element, a second heating element, and a first detection element T1. The output terminal of the power supply module is connected to the input terminal of the circuit breaker QF, and the output terminal of the circuit breaker QF is connected to the power supply terminal of the control module, the contact K1-1 of the first relay, and the contact K2-1 of the second relay. The contact K1-1 of the first relay is also connected to the first heating element, and the contact K2-1 of the second relay is also connected to the second heating element. The first detection element T1, the start button SB, the coil K1 of the first relay, and the coil K2 of the second relay are respectively connected to the control module. The power of the first heating element is five times or more than the power of the second heating element. Preferably, the power of the first heating element is ten times the power of the second heating element.

[0026] The first detection element T1 is used to detect the ambient temperature of the first heating element and the second heating element. For example, when the heating device is applied to a high-temperature aging chamber, the first heating element, the second heating element and the first detection element T1 are installed inside the high-temperature aging chamber, and the first detection element T1 is used to detect the temperature inside the high-temperature aging chamber.

[0027] When the circuit breaker QF is closed to connect the power supply, the initial target temperature and the final target temperature are set via the touch screen. The initial target temperature is slightly lower than the final target temperature (for example, the initial target temperature differs from the final target temperature by 5℃). When the start button SB is pressed, the control module controls the coils K1 and K2 of the first relay to be energized, and the contacts K1-1 and K2-1 of the first and second relays close, starting the first and second heating elements and initiating heating. When the temperature detected by the first detection element T1 reaches the initial target temperature, the control module controls the coil K1 of the first relay to be de-energized, and the contacts K1-1 of the first relay open, stopping the first heating element from working. Only the second heating element continues to work until the temperature detected by the first detection element T1 reaches the final target temperature, at which point the second heating element stops working. That is, rapid heating is achieved first through the first and second heating elements to improve heating efficiency, and then slow heating is achieved using the second heating element. Combined with closed-loop control based on temperature, high-precision heating is achieved.

[0028] Alternatively, pressing the start button SB energizes the coil K1 of the first relay, closing the contact K1-1 and initiating heating with the first heating element. When the temperature detected by the first detection element T1 reaches the initial target temperature, the control module de-energizes the coil K1 of the first relay, opening the contact K1-1 and stopping the first heating element. Simultaneously, it energizes the coil K2 of the second relay, starting heating with the second heating element. This process continues until the temperature detected by the first detection element T1 reaches the final target temperature, at which point the second heating element stops. This process achieves rapid heating and improved heating efficiency through the first heating element, followed by slow heating with the second heating element, combined with closed-loop temperature control to achieve high-precision heating.

[0029] This invention achieves high-precision heating while ensuring heating speed. The target temperature is set using a touch screen, making operation more convenient. Multiple target temperatures and the holding time of each target temperature can also be set using the touch screen. Each target temperature corresponds to an initial target temperature and a final target temperature. That is, to reach the target temperature, the first heating element is used to heat to the initial target temperature, and then the second heating element is used to heat to the final target temperature (i.e., the corresponding target temperature). By using multiple target temperatures and their holding times, aging tests can be carried out according to the temperature curve.

[0030] In a specific embodiment of this utility model, the heating device further includes a fuse FU, an indicator light L1, and a third relay. The fuse FU, the contact K3-1 of the third relay, and the indicator light L1 form a series branch. The coil K3 of the third relay is connected to the control module, and the series branch is connected to the output terminal of the circuit breaker QF.

[0031] When the start button SB is pressed, the control module energizes the coil K3 of the third relay, the contact K3-1 of the third relay closes, the series branch is connected, and the indicator light L1 lights up, indicating that heating is in operation. After heating is completed, the control module de-energizes the coil K3 of the third relay, the contact K3-1 of the third relay opens, the series branch is disconnected, the indicator light L1 goes out, indicating that the operation has stopped.

[0032] In a specific embodiment of this utility model, the heating device further includes a second detection element V1, a fourth relay, and a contactor for detecting the voltage at the output terminal of the circuit breaker QF. The coils of the second detection element V1 and the fourth relay are respectively connected to the control module. The normally closed contact K4-1 of the fourth relay is connected in series in a series branch. The coil KM1 of the contactor is connected in parallel to both ends of the indicator light L1. The contactor contact KM1-1 is located between the output terminal of the circuit breaker QF and the contact K1-1 of the first relay and the contact K2-1 of the second relay. In this embodiment, the second detection element V1 is connected to the control module via RS485.

[0033] When the voltage detected by the second detection element V1 is higher than the set voltage, the control module controls the coil K4 of the fourth relay to be energized, the normally closed contact K4-1 of the fourth relay to open, the series branch to be disconnected, the coil KM1 of the contactor to be de-energized, the contactor contact KM1-1 to open, thereby cutting off the first heating element and the second heating element to achieve overvoltage protection.

[0034] In a specific embodiment of this utility model, the heating device further includes a fifth relay and a cooler MF; the coil K5 of the fifth relay is connected to the control module, and the contact K5-1 of the fifth relay is connected to the output terminal of the circuit breaker QF and the cooler MF.

[0035] When it is necessary to rapidly cool down the environment where the first and second heating elements are located (e.g., rapid cooling in a high-temperature aging chamber), the coil K5 of the fifth relay is energized, the contact K5-1 of the fifth relay is closed, and the air cooler MF is activated to achieve rapid cooling.

[0036] In a specific embodiment of this utility model, the heating device further includes a third detection element T2 connected to the control module. The third detection element T2 is used to detect the ambient temperature of the first heating element and the second heating element. The third detection element T2 and the first detection element T1 are redundant to each other.

[0037] In a specific embodiment of this utility model, the heating device further includes an alarm, which is connected to the control module. When the test is completed, the alarm sounds. In this embodiment, the first heating element and the second heating element are heating resistors, respectively corresponding to… Figure 1 The heating resistors R1 and R2 are in the middle.

[0038] In a specific embodiment of this utility model, the control module is equipped with an Ethernet interface, which can monitor the test status through devices such as computers, tablets, and mobile phones with internet access.

[0039] The improvement of the heating device in this utility model lies in setting up two heating elements, a first heating element and a second heating element with significantly different power. The first heating element is used for rapid heating to ensure heating speed, and then the second heating element is used for slow heating to ensure heating accuracy and prevent excessively rapid heating that could exceed the final target temperature. In this utility model, the computer program involved in controlling the gain and loss of power of the temperature control relay is existing technology, as can be found in authorization announcement number CN206993441U, entitled "A Dual High-Frequency Heating Control Circuit for a 3D Glass Hot Bending Machine." Therefore, this utility model does not involve improvements to the computer program; it is a hardware improvement.

[0040] Example 2

[0041] like Figure 1As shown in the figure, a high-temperature aging chamber provided by this utility model includes a chamber body and a heating device as described in Embodiment 1 of this application. The first heating element, the second heating element, the first detection element T1, the third detection element T2, and the cooling fan of the heating device are all located inside the chamber body. The cooling fan can quickly reduce the temperature inside the chamber body to the required test temperature, thereby increasing the test speed.

[0042] In a specific embodiment of this utility model, the box body is made of 316 stainless steel, which can withstand high temperatures up to 1200℃ and can meet the high-temperature aging requirements of special cables.

[0043] In a specific embodiment of this utility model, an insulation layer is provided on the inner wall of the chamber (including the door). The insulation layer is made of ultra-fine glass wool, which provides good insulation and prevents burns to the hands of test personnel operating from outside. A sealing strip is provided around the door of the chamber to further improve the insulation effect. In this embodiment, the sealing strip is made of polytetrafluoroethylene asbestos rope, which has good sealing performance and can effectively save energy. Reinforcing ribs are provided on the inner side of the door to prevent deformation of the door under high temperatures.

[0044] The above description only discloses specific embodiments of the present utility model, but the protection scope of the present utility model is not limited thereto. Any changes or modifications that can be easily conceived by those skilled in the art within the technical scope disclosed in the present utility model should be included within the protection scope of the present utility model.

Claims

1. A heating device, characterized in that: The heating device includes a power module, a circuit breaker, a control module with a touch screen, a start button, a first relay, a second relay, a first heating element, a second heating element, and a first detection element for detecting the ambient temperature of the first and second heating elements. The output terminal of the power module is connected to the input terminal of the circuit breaker, and the output terminal of the circuit breaker is connected to the power terminal of the control module, the contacts of the first and second relays. The contacts of the first relay are also connected to the first heating element, and the contacts of the second relay are also connected to the second heating element. The coils of the first detection element, the start button, the first relay, and the second relay are respectively connected to the control module. The power of the first heating element is five times or more than the power of the second heating element.

2. The heating device according to claim 1, characterized in that: The heating device also includes a fuse, an indicator light, and a third relay. The fuse, the contacts of the third relay, and the indicator light form a series branch. The coil of the third relay is connected to the control module, and the series branch is connected to the output terminal of the circuit breaker.

3. The heating device according to claim 2, characterized in that: The heating device further includes a second detection element, a fourth relay, and a contactor for detecting the voltage at the output terminal of the circuit breaker; the coils of the second detection element and the fourth relay are respectively connected to the control module, the normally closed contact of the fourth relay is connected in series in the series branch, the coil of the contactor is connected in parallel to both ends of the indicator light, and the contactor is located between the output terminal of the circuit breaker and the contacts of the first and second relays.

4. The heating device according to claim 3, characterized in that: The second detection element is connected to the control module via RS485.

5. The heating device according to claim 1, characterized in that: The heating device also includes a fifth relay and a cooler; the coil of the fifth relay is connected to the control module, and the contacts of the fifth relay are connected to the output terminal of the circuit breaker and the cooler.

6. The heating device according to claim 1, characterized in that: The heating device also includes a third detection element connected to the control module, which is used to detect the ambient temperature of the first heating element and the second heating element.

7. The heating device according to any one of claims 1 to 6, characterized in that: The heating device also includes an alarm, which is connected to the control module.

8. A high-temperature aging chamber, characterized in that: The high-temperature aging chamber includes a chamber body and a heating device as described in any one of claims 1 to 7, wherein the first heating element, the second heating element, and the first detection element of the heating device are disposed within the chamber body.

9. The high-temperature aging chamber according to claim 8, characterized in that: The box body is made of 316 stainless steel; the inner wall of the box body is provided with a heat insulation layer, and the door of the box body is provided with a sealing strip around it; the inner side of the door of the box body is provided with reinforcing ribs.

10. The high-temperature aging chamber according to claim 9, characterized in that: The insulation layer is made of ultra-fine glass wool, and the sealing strip is made of polytetrafluoroethylene asbestos rope.

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