Explosion-proof heat pipe heater for mine car

Abstract

The utility model belongs to the technical field of mining 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 utility model belongs to the technical field of mine heating, especially relates to a mine car explosion -proof heat pipe heater. BACKGROUND

[0002] The downhole environment requires explosion isolation, and the heating equipment usually adopts electric heating wire to heat, and the electric heating wire is easy to ignite gas, so direct use is not allowed, and a layer of explosion isolation shell needs to be made outside the heating wire.

[0003] The explosion -proof electric appliance refers to the electric appliance capable of preventing explosion accidents in the occasion containing explosive dangerous gas mixture. It is mainly applied to coal mines, mines and places with prominent explosive gas such as gas. There are two reasons for the electric equipment to ignite the combustible gas mixture: one is the spark, arc produced by the electric equipment, and the other is the heat on the surface of the electric equipment (i.e. the surface in contact with the combustible gas mixture). For the parts that can produce arc and spark during normal operation of the equipment, they are placed in the explosion -proof shell, or other explosion -proof types such as pouring sealing type, sand filling type, oil filling type or positive pressure type are adopted to achieve the purpose of explosion prevention.

[0004] Because the current is large at the moment of power on, the conventional electric heater has a greater possibility of generating micro-arc and spark, which puts forward higher requirements for the design of explosion -proof structure. Unlike conventional explosion -proof electric appliances, electric heaters need to maintain sufficient energy exchange between the equipment and the external environment, and the explosion -proof structure requires it to be completely encapsulated as much as possible. This contradiction makes it difficult to achieve both at the structural design level. If the explosion -proof shell of the electric heater is made of steel plate, its thermal conductivity is very low, resulting in low heating efficiency and high energy consumption. Therefore, it is necessary to improve the structure of the explosion -proof electric heater to ensure the explosion -proof effect as much as possible without affecting the heat dissipation and heating. UTILITY MODEL CONTENTS

[0005] In order to overcome the defects of the prior art, the utility model aims at providing an explosion -proof heat pipe heater for mine car, which uses PTC device as heat source and heat pipe for heat transfer to improve heating efficiency and reduce energy consumption under the premise of meeting explosion -proof requirements.

[0006] In order to achieve the above -mentioned purpose, the utility model realizes the following technical scheme:

[0007] An explosion -proof heat pipe heater for mine car, comprising a shell, a substrate, a heat pipe, a fin, an explosion -proof motor, a fan, 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 with the substrate, and the condensation section of the heat pipe is fixedly connected with the fin; the shell is provided with an air inlet, the fan is fixedly connected with the shell, and the fan is driven by the explosion -proof motor.

[0008] The base plate is made of copper plate, and the middle part of the base plate is provided with an explosion-proof cavity for mounting a PTC device, and the side part of the base plate is fixedly connected with a cover plate.

[0009] The side part of the base plate is fixedly connected with an explosion-proof wiring terminal.

[0010] The surface of the base plate is provided with recesses parallel to each other, and the cross section of the recesses is semicircular and matched with the heat pipe.

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

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

[0013] The fin is made of aluminum plate, and the fin is provided with a flanged hole, and the fin is in interference fit with the heat pipe through the flanged hole.

[0014] Compared with the prior art, the utility model has the advantages that:

[0015] The utility model discloses can satisfy the requirement of downhole explosion -proof, can improve heating efficiency, reduce energy consumption, and the suitability is stronger. Adopt PTC device as heat source, carry out high -efficient heat transfer by the heat pipe welded on the outside of base plate, utilize centrifugal fan to send the hot air after heating to the area needing heating again. The utility model satisfies the requirement of I type explosion -proof, is applicable to the environment containing explosive gas such as coal mine downhole, and the explosion -proof grade is EXDIMB, can heat the mining car cab and other places, and operation is efficient, safe and reliable. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is the structure schematic view of the explosion -proof heat pipe heater for mine car.

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

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

[0019] Figure 4 It is the structure schematic view of base plate.

[0020] Figure 5 It is the connection schematic view of fin, heat pipe and base plate.

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

[0022] In the drawing: 1, fin group;2, shell;3, fan;4, explosion -proof motor;5, air outlet pipe;6, explosion -proof wiring terminal;7, base plate;8, heat pipe;9, fin;10, PTC device;11, cover plate;12, recess. DETAILED DESCRIPTION

[0023] The utility model will be described in detail below in conjunction with the drawings of the specification, but it should be pointed out that the implementation of the utility model is not limited to the following embodiments.

[0024] See Figures 1-5 An explosion-proof heat pipe heater for mine car, including casing 2, base plate 7, heat pipe 8, fin group, explosion-proof motor 4, fan 3, PTC device 10, base plate 7 is fixed in casing 2, PTC device 10 is arranged in base plate 7, the evaporation section of heat pipe 8 is welded with base plate 7, and the condensation section of heat pipe 8 is fixedly connected with fin group;Fin group is composed of several mutually parallel fins 9. The casing 2 is provided with an air inlet. The fan 3 is fixedly connected with the casing 2, and the fan 3 is driven by the explosion-proof motor 4. The bottom of the casing 2 outside the fan 3 is fixed with an air outlet pipe 5. The fan 3 can adopt a centrifugal fan 3. The air inlet of the fan 3 is oppositely arranged with the air inlet of the casing 2.

[0025] See Figure 4 Base plate 7 is made of copper plate, at least one explosion-proof cavity is arranged in the middle of base plate 7 for installing PTC device 10, the side of base plate 7 is fixedly connected with cover plate 11 through bolts, cover plate 11 is used to close the explosion-proof cavity, and PTC device 10 is conveniently disassembled. Multiple explosion-proof cavities can be arranged side by side, and one PTC device is installed in each explosion-proof cavity. The other side of base plate 7 is fixedly connected with explosion-proof terminal 6 for electrical connection with the outside, so as to meet the explosion-proof requirement. Explosion-proof terminal 6 is communicated with explosion-proof cavity. Parallel grooves 12 are formed on the surface of base plate 7, and the cross section of groove 12 is semicircular and matched with heat pipe 8. In addition, heat insulation pad is arranged at the bottom of base plate 7, so that heat is transmitted to the air outlet pipe 5 of fan 3 through the fin group for heating air. A pipe can be connected to the air outlet pipe 5 to conduct hot air to the position needing heating.

[0026] See Figures 1-3 PTC device 10 is used as heat source, heat pipe 8 is welded outside base plate 7 for efficient heat transfer, heat pipe 8 and multiple mutually parallel fins 9 are installed in interference fit, and the outside of fin 9 is provided with casing 2 and fan 3, so that hot air flowing through fin group is blown to the area needing heating.

[0027] PTC device 10 has the advantages of constant temperature heating, small thermal resistance, high heat exchange efficiency and low power attenuation during long-term use. Another prominent feature of PTC device 10 is safety performance, that is, when fan 3 fails to stop, the power of PTC device will automatically decrease sharply because PTC device cannot be fully cooled, and at this time, the surface temperature of PTC device 10 is maintained at about Curie temperature (generally about 250 DEG C), so that the surface "red" phenomenon of electric heating tube 8 type heater is not caused.

[0028] Heat pipe 8 has an L-shaped structure and is made of copper. The inner wall of heat pipe 8 has an internal toothed structure to improve heat conduction. The thermal conductivity of heat pipe 8 is 10,000~20,000 W / (m·K), which is 20~50 times that of copper, exhibiting high isothermal properties and thermal conductivity, allowing for the seamless transfer of heat from the explosion-proof cavity. The L-shaped heat pipes 8 can be arranged in a staggered manner, allowing the evaporation section to be more evenly distributed on the fins 9, resulting in a more uniform heat distribution.

[0029] See Figure 6 The fins 9 are made of aluminum plates and have flanged holes. The fins 9 are interference-fitted with the heat pipes 8 through the flanged holes to improve heat conduction and heat dissipation efficiency.

[0030] The housing 2 has mounting holes for fixing to external structures, allowing the explosion-proof heat pipe heater for the mine car to be fixed inside. When heating is required, the PTC device 10 is activated, and the substrate 7 heats up, transferring heat to the fins 9 via the heat pipe 8. Under the action of the fan 3, outside air enters the housing 2 through the air inlet, and the heat entering the fin assembly forms warm air that enters the air inlet of the fan 3 and is then drawn out through the air outlet 5 of the fan 3, thereby increasing the temperature inside the mine car. The housing 2 can be made of steel plate and is fixed to the substrate with screws.

[0031] This invention not only meets the explosion-proof requirements for underground mining but also improves heating efficiency, reduces energy consumption, and has wider applicability. It uses a PTC device as the heat source, with efficient heat transfer via heat pipes welded to the outside of the substrate. A centrifugal fan then blows the heated air, which has passed through the fins, to the area requiring heating.

[0032] Through the above specific embodiments, those skilled in the art can easily implement this utility model. However, it should be understood that this utility model is not limited to the specific embodiments described above. Based on the disclosed embodiments, those skilled in the art can arbitrarily combine different technical features to achieve different technical solutions. Due to space limitations and for the sake of brevity, not all of these combined solutions have been described. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An explosion-proof heat pipe heater for a mine car, characterized by, The application relates to a PTC device cooling device, which comprises a shell, a base plate, a heat pipe, fins, an explosion-proof motor, a fan and a PTC device.

2. The explosion-proof heat pipe heater for a mine car according to claim 1, wherein The base plate is made of copper plate, and the middle part of the base plate is provided with an explosion-proof cavity for mounting the PTC device.

3. The explosion-proof heat pipe heater for mine cars according to claim 1, characterized in that The side part of the base plate is fixedly connected with an explosion-proof wiring terminal.

4. The explosion-proof heat pipe heater for mine cars according to claim 1, characterized in that, The surface of the base plate is provided with recesses parallel to each other, and the cross section of the recesses is semicircular and matched with the heat pipe.

5. The explosion-proof heat pipe heater for mine cars according to claim 1, characterized in that, The heat pipe is of L-shaped structure.

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

7. The explosion-proof heat pipe heater for mine cars according to claim 1, characterized in that The fins are made of aluminum plate, and the fins are provided with flanged holes and are in interference fit with the heat pipe through the flanged holes.

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