Small self-temperature-limiting type waterproof and dustproof heating rod

Abstract

The invention discloses a small self-temperature-limiting type waterproof and dustproof heating rod which comprises a heating rod body, a heating assembly and a temperature control assembly are arranged in the heating rod body, a sealing structure is arranged on the surface of the heating rod body, the heating rod body is a 304 stainless steel instrument pipe, the pipe diameter is 18 mm, the wall thickness is 1 mm, and the length is 11 mm. The tail of the rod body is sealed by stainless steel, and a connecting cable is led out from the head. The heating and temperature control integrated built-in design is adopted, all parts are compactly connected, the overall size is greatly reduced, the installation requirement of a narrow space is met, the field installation difficulty is reduced, all the parts are fixedly connected in multiple modes of mechanical assembly, welding, pressing and the like, circuits are accurately connected in series through leads, magnesium oxide powder insulation filling and high-temperature-resistant glass fiber pipe protection are matched, and the reliability is high. The connection is firm, the circuit is stable, and the problem of poor contact or open circuit is not easy to occur.

Description

Technical Field

[0001] This invention relates to the field of petrochemical instrument technology, specifically a small, self-regulating, waterproof, and dustproof heating rod. Background Technology

[0002] Existing low-power heating elements (below 600 watts) are generally split-type. The heating element heats up after being powered on, and temperature control is achieved through thermocouple temperature measurement and feedback to a temperature control switch. These elements are relatively large and take up considerable space during on-site installation. Furthermore, due to their large size, explosion-proof treatment requires a separate temperature control system for the radiator, resulting in high costs and difficulties in on-site installation. Therefore, we propose a small, self-regulating, waterproof, and dustproof heating element. Summary of the Invention

[0003] The purpose of this invention is to provide a small, self-regulating, waterproof, and dustproof heating rod to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a small self-regulating temperature-controlled waterproof and dustproof heating rod, comprising a heating rod body, wherein a heating component and a temperature control component are disposed inside the heating rod body, and a sealing structure is disposed on the surface of the heating rod body.

[0005] Optionally, the heating rod body is a 304 stainless steel instrument tube with a diameter of 18mm, a wall thickness of 1mm, and a length of 11mm. The tail of the rod body is sealed with stainless steel, and a connecting cable is led out from the head. The length of the connecting cable is 1.5 meters, and the outer sheath material is a -60℃ low temperature silicone rubber sheath.

[0006] Optionally, the heating assembly includes an alumina carrier, a heating wire, and a magnesium oxide powder filling layer. The alumina carrier is disposed inside the heating rod body, the heating wire is evenly spirally wound along the central axis of the alumina carrier, and the magnesium oxide powder filling layer is disposed between the heating wire and the heating rod body.

[0007] Optionally, the temperature control component includes a temperature switch and a temperature protection device disposed on the temperature switch. Both the temperature switch and the temperature protection device are built into the interior of the alumina carrier. The temperature switch has a rated current of 10A, a voltage of 250VAC, an insulation resistance of ≥100MΩ, a normal contact resistance of ≤50mΩ, a response speed of ≤1℃ / minute, and a lifespan of >10,000 cycles.

[0008] Optionally, the sealing structure includes a primary diameter reduction zone, a secondary diameter reduction zone, a silicone sealing gasket, and a ceramic adhesive sealing layer. The tail of the heating rod is sequentially processed through primary and secondary diameter reduction to form a stepped diameter reduction structure. The silicone sealing gasket is lined inside the secondary diameter reduction zone, and the ceramic adhesive sealing layer is applied to the sealing areas at both ends of the heating rod.

[0009] Optionally, the power specification of the heating wire (X) is 50W to 600W, the maximum operating temperature of the heating rod corresponds to the power of the heating wire, and the maximum operating temperature is divided into multiple groups. The upper limit temperature value of the group includes ≤165℃, and various temperature values ​​in a 5℃ gradient from 170℃ to 400℃. The heating rod is equipped with a temperature switch, and the closing temperature of the temperature switch is set to less than 90±15℃ or less than 150±25℃. The operating temperature of the temperature protection device is set to any one of 185℃ and 250℃, 230℃ and 280℃, or 280℃ and 330℃, up to a maximum of 400℃ in multiple preset temperature groups.

[0010] Optionally, the heating component and the temperature control component are connected in series to form a closed circuit through the lead wires of the high-temperature resistant glass fiber tube sheath. The high-temperature resistant glass fiber tube has a heat resistance temperature of ≥400℃ and meets the Class V flame retardant requirements.

[0011] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. Compact size and easy installation: It adopts an integrated design of heating and temperature control, with compact connection of all components, which greatly reduces the overall size, adapts to the installation needs of narrow spaces, and reduces the difficulty of on-site installation.

[0012] 2. Stable connection and high reliability: The components are fixedly connected by multiple methods such as mechanical assembly, welding and pressing. The circuit is precisely connected in series by lead wires. With magnesium oxide powder insulation filling and high temperature resistant glass fiber tube protection, the connection is firm and the circuit is stable, and it is not easy to have poor contact or open circuit problems.

[0013] 3. Waterproof and dustproof, extended lifespan: Through a double-diameter reduction process, silicone sealing gasket, ceramic adhesive sealing layer and silicone sleeve compression sealing, a multi-protection structure is formed to completely block moisture and dust from entering the interior, avoid component oxidation and circuit damage, and significantly extend the service life of the heating rod.

[0014] 4. Controllable cost and strong adaptability: The integrated connection structure eliminates the need for a separate temperature control system and additional installation accessories, simplifying the assembly process and reducing equipment costs; the combination design of multiple power and temperature specifications can adapt to the heating needs of different scenarios. Attached Figure Description

[0015] Figure 1 This is a front view structural diagram of the present invention; Figure 2 This is a schematic diagram of the internal structure of the present invention; Figure 3 This is a schematic diagram of the temperature control component of the present invention; Figure 4 For the present invention Figure 2 Structural cross-section of AA; Figure 5 For the present invention Figure 2 Cross-sectional view of the structure of BB.

[0016] In the diagram: 1. Heating rod body; 2. Heating component; 201. Alumina carrier; 202. Special heating wire; 3. Temperature control component; 301. Temperature switch; 302. Temperature protection device; 4. Silicone sealing gasket. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] Please see Figure 1-5 A small, self-regulating, waterproof, and dustproof heating rod includes a heating rod body 1, a heating component 2 and a temperature control component 3 inside the heating rod body 1, and a sealing structure on the surface of the heating rod body 1.

[0019] Specifically, the heating rod body 1 is a 304 stainless steel instrument tube with a diameter of 18mm, a wall thickness of 1mm, and a length of 11mm. The tail of the rod body is sealed with stainless steel, and the head leads out a connecting cable with a length of 1.5 meters. The outer sheath is made of -60℃ low temperature silicone rubber.

[0020] Specifically, the heating component 2 includes an alumina carrier 201, a special heating wire 202, and a magnesium oxide powder filling layer. The alumina carrier 201 is disposed inside the heating rod body 1. The special heating wire 202 is evenly distributed and spirally wound along the central axis of the alumina carrier 201. The magnesium oxide powder filling layer is disposed between the special heating wire 202 and the heating rod body 1.

[0021] Specifically, the temperature control component 3 includes a temperature switch 301 and a temperature protection device 302 installed on the temperature switch 301. Both the temperature switch 301 and the temperature protection device 302 are built into the interior of the alumina carrier 201. The temperature switch 301 has a rated current of 10A, a voltage of 250VAC, an insulation resistance of ≥100MΩ, a normal contact resistance of ≤50mΩ, a response speed of ≤1℃ / minute, and a lifespan of >10,000 times.

[0022] Specifically, the sealing structure includes a primary diameter reduction area, a secondary diameter reduction area, a silicone sealing gasket 4, and a ceramic adhesive sealing layer. The tail of the heating rod body 1 is processed through primary and secondary diameter reduction to form a stepped diameter reduction structure. The silicone sealing gasket 4 is lined inside the secondary diameter reduction area, and the ceramic adhesive sealing layer is applied to the sealing areas at both ends of the heating rod body 1.

[0023] Specifically, the heating wire has a power specification of 50W to 600W. The maximum operating temperature of the heating rod corresponds to the power of the heating wire, and the maximum operating temperature is divided into multiple groups. The upper limit temperature value of each group includes ≤165℃, and various temperature values ​​in increments of 5℃ from 170℃ to 400℃. The heating rod is equipped with a temperature switch, and the closing temperature of the temperature switch is set to less than 90±15℃ or less than 150±25℃. The operating temperature of the temperature protection device is set to any one of 185℃ and 250℃, 230℃ and 280℃, or 280℃ and 330℃, up to a maximum of 400℃, for multiple preset temperature groups required by customers.

[0024] Specifically, heating component 2 and temperature control component 3 are connected in series to form a closed circuit through the lead wires of high-temperature resistant glass fiber tube sheath. The high-temperature resistant glass fiber tube has a heat resistance temperature of ≥400℃ and meets the Class V flame retardant requirements.

[0025] In use, the free end of the external connection cable is connected to a 230V, 50Hz rated power supply. Current flows through the cable conductors into the closed circuit formed by the heating element 2 and the temperature control element 3 connected in series, powering the entire heating rod. When current flows through the heating wire 202, the heating wire 202 generates heat based on the current heating effect. The heat is conducted to the heating rod body 1 through the tightly fitted alumina carrier 201, and then released from the rod body to the external environment to be heated. At the same time, the magnesium oxide powder filling layer serves both as insulation and protection, and also helps to conduct heat evenly, preventing local overheating of the heating wire. The temperature switch 301 is built into the alumina carrier 201 and can sense the temperature signal conducted by the heating element 2 in real time. When the heating temperature is lower than the preset closing temperature of the temperature switch (for 50W-600W models, the closing temperature of the temperature switch corresponds to less than 90±15℃ and less than 150±25℃; the temperature protection device can be set to operate at any of the following temperature groups: 185℃ and 250℃, 230℃ and 280℃, 280℃ and 330℃, up to a maximum of 400℃ for multiple customer-required temperature groups), the temperature switch 301 remains closed, the circuit remains continuous, and the heating wire 202 heats normally. When the heating temperature rises to the preset closing temperature threshold, the metal body of the temperature switch 301 is triggered to disconnect due to thermal expansion, cutting off the circuit and stopping the heating wire from heating. After the ambient temperature drops and the temperature of the temperature switch 301 falls below the threshold, the metal body contracts and resets, the circuit closes again, and the heating wire 202 resumes heating. This cycle achieves self-limiting temperature control, ensuring that the maximum temperature of the heating rod remains stable within the preset range (e.g., ≤165℃ or ≤230℃). If the temperature switch 301 malfunctions and fails to disconnect properly, causing the heating temperature to continuously rise to the operating temperature of the temperature protection device (e.g., 185℃ or 250℃), the temperature protection device 302 (fuse) will quickly melt, forcibly cutting off the entire circuit to prevent the heating rod from being damaged by overheating and to prevent potential safety hazards. The high-temperature resistant glass fiber tube and magnesium oxide powder filling layer of the internal leads provide continuous insulation protection in high-temperature environments, ensuring circuit safety. The multi-seal structure continuously prevents external moisture and dust from entering the rod body during operation, avoiding oxidation or short circuits of core components such as the heating wire, leads, and temperature control components, ensuring stable operation of the heating rod in the complex environment of the petrochemical industry.

[0026] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A small, self-regulating, waterproof, and dustproof heating rod, comprising a heating rod body (1), characterized in that: The heating rod body (1) is provided with a heating component (2) and a temperature control component (3) inside, and a sealing structure is provided on the surface of the heating rod body (1).

2. The small self-regulating, waterproof, and dustproof heating rod according to claim 1, characterized in that: The heating rod body (1) is a 304 stainless steel instrument tube with a diameter of 18mm, a wall thickness of 1mm, and a length of 11mm. The tail of the rod body is sealed with stainless steel, and a connecting cable is led out from the head. The length of the connecting cable is 1.5 meters, and the outer sheath material is a -60℃ low temperature silicone rubber sheath.

3. The small self-regulating, waterproof, and dustproof heating rod according to claim 2, characterized in that: The heating component (2) includes an alumina carrier (201), a special heating wire (202), and a magnesium oxide powder filling layer. The alumina carrier (201) is disposed inside the heating rod body (1). The heating wire (202) is evenly spirally wound along the central axis of the alumina carrier (201). The magnesium oxide powder filling layer is disposed between the heating wire (202) and the heating rod body (1).

4. The small self-regulating, waterproof, and dustproof heating rod according to claim 3, characterized in that: The temperature control component (3) includes a temperature switch (301) and a temperature protection device (302) disposed on the temperature switch (301). Both the temperature switch (301) and the temperature protection device (302) are built into the interior of the alumina carrier (201).

5. The small self-regulating, waterproof, and dustproof heating rod according to claim 4, characterized in that: The sealing structure includes a primary diameter reduction zone, a secondary diameter reduction zone, a silicone sealing gasket (4), and a ceramic adhesive sealing layer. The tail of the heating rod body (1) is processed by primary and secondary diameter reduction to form a stepped diameter reduction structure. The silicone sealing gasket (4) is lined inside the secondary diameter reduction zone. The ceramic adhesive sealing layer is applied to the sealing areas at both ends of the heating rod body (1).

6. The small self-regulating, waterproof, and dustproof heating rod according to claim 5, characterized in that: The power rating of the heating wire (X) is 50W to 600W; The maximum operating temperature of the heating rod corresponds to the power of the heating wire, and the maximum operating temperature is divided into multiple groups. The upper limit temperature value of the group includes ≤165℃, and various temperature values ​​in a 5℃ gradient from 170℃ to 400℃. The heating rod is equipped with a temperature switch, and the closing temperature of the temperature switch is set to be less than 90±15℃ or less than 150±25℃. The operating temperature of the temperature protection device is set to any one of the following groups: 185℃ and 250℃, 230℃ and 280℃, or 280℃ and 330℃, up to a maximum of 400℃.

7. The small self-regulating waterproof and dustproof heating rod according to claim 6, characterized in that: The heating component (2) and the temperature control component (3) are connected in series to form a closed circuit through the lead wires of the high-temperature resistant glass fiber tube sheath. The heat resistance temperature of the high-temperature resistant glass fiber tube is ≥400℃, which meets the requirements of Class V flame retardancy.

Images