Explosion-proof heat pipe heater for mine car

Abstract

The invention belongs to the technical field of mine heating, and particularly relates to an explosion-proof heat pipe heater for a mine car, which comprises a shell, a substrate, heat pipes, fins, an explosion-proof motor, a fan and a PTC (Positive Temperature Coefficient) device, the substrate is fixed in the shell, the PTC device is arranged in the substrate, an evaporation section of each heat pipe is fixedly connected with the substrate, and a condensation section of each heat pipe is fixedly connected with the plurality of fins; the shell is provided with an air inlet, the fan is fixedly connected with the shell, and the fan is driven by an explosive-proof motor. The underground explosion-proof heating device has the advantages that the underground explosion-proof requirement can be met, the heating efficiency can be improved, the energy consumption is reduced, and the applicability is higher. The PTC device is adopted as a heat source, efficient heat transfer is conducted through the heat pipe welded to the outer portion of the substrate, and then heated hot air flowing through the fins is blown to an area needing to be heated through the centrifugal fan.

Description

Technical Field

[0001] The invention belongs to the technical field of mine heating, and in particular relates to an explosion-proof heat pipe heater for a mine car. Background Art

[0002] The underground environment requires explosion-proofing. Heating equipment usually uses electric heating wires for heating. However, electric heating wires can easily ignite gas and are not allowed to be used directly. A flameproof shell needs to be made on the outside of the heating wire and meet the requirements of GB 3836.1-2010 "Explosive Atmospheres Part 1: General Requirements for Equipment" and GB 3836.2-2010 "Explosive Atmospheres Part 2: Equipment Protected by Flameproof Enclosure "d"".

[0003] Explosion-proof electrical appliances refer to electrical appliances that can prevent explosion accidents in places containing explosive gas mixtures. They are mainly used in coal mines and mines where explosive gases such as gas are prominent. There are two reasons why electrical equipment ignites flammable gas mixtures: one is the sparks and arcs generated by the electrical equipment, and the other is the heat generated on the surface of the electrical equipment (i.e. the surface in contact with the flammable gas mixture). For parts of the equipment that can generate arcs and sparks during normal operation, they can be placed in a flameproof enclosure, or other explosion-proof types such as cast-in-place, sand-filled, oil-filled or positive pressure types can be adopted to achieve the purpose of explosion-proof.

[0004] Conventional electric heaters have a greater possibility of generating microscopic arcs and sparks due to the large current at the moment of power-on, which places higher demands on the design of the explosion-proof structure. Unlike conventional explosion-proof electrical appliances, electric heaters need to maintain sufficient energy exchange between the equipment and the external environment, while the explosion-proof structure requires it to be as completely encapsulated as possible. This contradiction makes it difficult to achieve a balance at the structural design level. If the explosion-proof shell of the electric heater is made only of steel plates, its thermal conductivity is very low, resulting in low heating efficiency and high energy consumption. Therefore, it is necessary to improve the structure of explosion-proof electric heaters in order to ensure the explosion-proof effect as much as possible without affecting heat dissipation and heating. Summary of the invention

[0005] In order to overcome the deficiencies of the prior art, the purpose of the present invention is to provide an explosion-proof heat pipe heater for a mine car. Under the premise of meeting the explosion-proof requirements, a PTC device is used as a heat source, and a heat pipe is used for heat transfer to improve heating efficiency and reduce energy consumption.

[0006] To achieve the above object, the present invention is implemented through the following technical solutions:

[0007] An explosion-proof heat pipe heater for a mining car comprises a shell, a substrate, a heat pipe, fins, a flameproof motor, a fan and a PTC device. The substrate is fixed in the shell, the PTC device is arranged in the substrate, the evaporation section of the heat pipe is fixedly connected to the substrate, and the condensation section of the heat pipe is fixedly connected to a plurality of fins; an air inlet is arranged on the shell, the fan is fixedly connected to the shell, and the fan is driven by the flameproof motor.

[0008] The base plate is made of copper plate, a flameproof cavity is arranged in the middle of the base plate for installing the PTC device, and the side of the base plate is fixedly connected with the cover plate.

[0009] The side of the substrate is fixedly connected with a flameproof wiring terminal.

[0010] The surface of the substrate is provided with grooves parallel to each other, and the cross section of the groove is a semicircle matching the heat pipe.

[0011] The heat pipe is an L-shaped structure.

[0012] The heat pipe is made of a copper pipe, and the inner wall of the heat pipe has an inner tooth structure.

[0013] The fin is made of an aluminum plate, and a flange hole is provided on the fin. The fin is interference-fitted with the heat pipe through the flange hole.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] The present invention can not only meet the underground explosion-proof requirements, but also improve the heating efficiency, reduce energy consumption, and has stronger applicability. The PTC device is used as the heat source, and the heat pipe welded on the outside of the substrate performs efficient heat transfer, and then the hot air heated by the fins is blown to the area that needs to be heated by the centrifugal fan. The present invention meets the Class I explosion-proof requirements and is suitable for environments containing explosive gases such as underground coal mines. The explosion-proof grade is EXDIMB, and it can provide heating for the cab of a mining vehicle and other places, and the operation is efficient, safe, and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of an explosion-proof heat pipe heater used in a mine car.

[0017] Figure 2 It is a schematic diagram of the structure inside the shell.

[0018] Figure 3 is a perspective view of an explosion-proof heat pipe heater for a mine car.

[0019] Figure 4 It is a schematic diagram of the structure of the substrate.

[0020] Figure 5 It is a connection diagram of fins, heat pipes and substrate.

[0021] Figure 6 It is a schematic diagram of the structure of the fin.

[0022] In the figure: 1. fin group; 2. shell; 3. fan; 4. flameproof motor; 5. air outlet duct; 6. flameproof terminal; 7. base plate; 8. heat pipe; 9. fin; 10. PTC device; 11. cover plate; 12. groove. DETAILED DESCRIPTION

[0023] The present invention is described in detail below in conjunction with the accompanying drawings, but it should be noted that the implementation of the present invention is not limited to the following embodiments.

[0024] See Figure 1-Figure 5 , an explosion-proof heat pipe heater for a mine car, comprising a shell 2, a substrate 7, a heat pipe 8, a fin group, a flameproof motor 4, a fan 3, and a PTC device 10. The substrate 7 is fixed in the shell 2, the PTC device 10 is arranged in the substrate 7, the evaporation section of the heat pipe 8 is welded to the substrate 7, and the condensation section of the heat pipe 8 is fixedly connected to the fin group; the fin group is composed of a plurality of fins 9 arranged parallel to each other. An air inlet is provided on the shell 2. The fan 3 is fixedly connected to the shell 2, and the fan 3 is driven by the flameproof motor 4. An air outlet 5 is fixed to the bottom of the shell 2 outside the fan 3. The fan 3 can be a centrifugal fan 3. The air inlet of the fan 3 is arranged opposite to the air inlet of the shell 2.

[0025] See Figure 4 , the substrate 7 is made of copper plate, and at least one explosion-proof cavity is provided in the middle of the substrate 7 for installing the PTC device 10. The side of the substrate 7 is fixedly connected to the cover plate 11 by bolts. The cover plate 11 is used to close the explosion-proof cavity to facilitate the disassembly and assembly of the PTC device 10. Multiple explosion-proof cavities can be arranged side by side, and a PTC device is installed in each explosion-proof cavity. The other side of the substrate 7 is fixedly connected with an explosion-proof terminal 6 for external electrical connection to meet the explosion-proof requirements. The explosion-proof terminal 6 is connected to the explosion-proof cavity. The surface of the substrate 7 is provided with grooves 12 parallel to each other, and the cross-section of the groove 12 is a semicircle that matches the heat pipe 8. In addition, a heat insulation pad is provided at the bottom of the substrate 7 to allow the heat to heat the air through the fin group and transmit it to the outlet pipe 5 of the fan 3. A pipe can be connected to the outlet pipe 5 to conduct the hot air to the position that needs to be heated.

[0026] See Figure 1-Figure 3 The PTC device 10 is used as a heat source, and a heat pipe 8 is welded to the outside of the substrate 7 for efficient heat transfer. The heat pipe 8 and a plurality of parallel fins 9 are installed by interference fit. A shell 2 and a fan 3 are provided outside the fin 9 to blow the hot air heated by the fin 9 group to the area that needs to be heated.

[0027] The PTC device 10 has the advantages of constant temperature heating, small thermal resistance, high heat exchange efficiency and low power attenuation in long-term use. Another outstanding feature of the PTC device 10 is safety performance. When the fan 3 fails and stops, the PTC device cannot get sufficient heat dissipation, and its power will automatically drop sharply. At this time, the surface temperature of the PTC device 10 is maintained at about the Curie temperature (generally around 250°C), so as not to cause the "reddening" phenomenon of the surface of the electric heating tube 8 heater.

[0028] The heat pipe 8 is an L-shaped structure, made of a copper tube, and the inner wall of the heat pipe 8 has an internal tooth structure to improve the heat conduction effect. The thermal conductivity of the heat pipe 8 is 10000-20000 W / (m·K), which is 20-50 times that of copper. It has high isothermal and thermal conductivity, and can transfer the heat of the explosion-proof cavity without attenuation. The L-shaped heat pipe 8 can be relatively staggered, and the evaporation section can be more evenly arranged on the fin 9, so that the heat is more evenly distributed.

[0029] See Figure 6 The fin 9 is made of an aluminum plate and is provided with a flanged hole. The fin 9 is interference-fitted with the heat pipe 8 through the flanged hole to improve the heat conduction and heat dissipation efficiency.

[0030] The shell 2 is provided with a mounting hole fixed to the external structure, and the explosion-proof heat pipe heater for the mine car can be fixed inside the mine car. When heating is needed, the PTC device 10 is started, and the heat is transferred to the fins 9 by the heat pipe 8 after the substrate 7 is heated up. Under the action of the fan 3, the external air enters the shell 2 from the air inlet of the shell 2, and the heat entering between the fin groups forms warm air and enters the air inlet of the fan 3, and then is led out by the air outlet 5 of the fan 3, thereby increasing the temperature inside the mine car. The shell 2 can be made of steel plate, which is fixedly connected to the substrate by screws.

[0031] The invention can not only meet the underground explosion-proof requirements, but also improve the heating efficiency, reduce energy consumption, and has stronger applicability. The PTC device is used as the heat source, and the heat pipe welded on the outside of the substrate performs efficient heat transfer, and then the hot air heated by the fins is blown to the area that needs to be heated by the centrifugal fan.

[0032] Through the above specific implementation, the technical personnel in the relevant technical field can easily implement the present invention. However, it should be understood that the present invention is not limited to the above specific implementation. On the basis of the disclosed implementation, the technical personnel in the relevant technical field can arbitrarily combine different technical features to achieve different technical solutions. Due to the limited space and to make the specification concise, the various solutions composed of these combinations are not described one by one. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An explosion-proof heat pipe heater for a mine car, characterized in that: It includes a shell, a substrate, a heat pipe, fins, a flameproof motor, a fan, and a PTC device. The substrate is fixed in the shell, the PTC device is arranged in the substrate, the evaporation section of the heat pipe is fixedly connected to the substrate, and the condensation section of the heat pipe is fixedly connected to a plurality of fins; an air outlet is provided on the shell, the fan is fixedly connected to the shell, and the fan is driven by the flameproof motor.

2. The explosion-proof heat pipe heater for a mine car according to claim 1, characterized in that: The base plate is made of copper plate, a flameproof cavity is arranged in the middle of the base plate for installing the PTC device, and the side of the base plate is fixedly connected with the cover plate.

3. The explosion-proof heat pipe heater for a mine car according to claim 1, characterized in that: The side of the substrate is fixedly connected with a flameproof wiring terminal.

4. The explosion-proof heat pipe heater for a mine car according to claim 1, characterized in that: The surface of the substrate is provided with grooves parallel to each other, and the cross section of the groove is a semicircle matching the heat pipe.

5. The explosion-proof heat pipe heater for a mine car according to claim 1, characterized in that: The heat pipe is an L-shaped structure.

6. The explosion-proof heat pipe heater for a mine car according to claim 1, characterized in that: The heat pipe is made of a copper pipe, and the inner wall of the heat pipe has an inner tooth structure.

7. The explosion-proof heat pipe heater for a mine car according to claim 1, characterized in that: The fin is made of an aluminum plate, and a flange hole is provided on the fin. The fin is interference-fitted with the heat pipe through the flange hole.

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