Low-voltage direct-current power supply device for explosive environment

Abstract

The invention discloses a low-voltage direct-current power supply device for an explosive environment, which comprises an explosive-proof shell, an upper cover plate and a lower cover plate are respectively fixed at the upper end and the lower end of the explosive-proof shell, a base is arranged at the upper end of the lower cover plate, two groups of symmetrical heat pipes are arranged at the upper end of the base, each group of heat pipes comprises at least four heat pipes, and each heat pipe comprises a horizontal section and an inclined section. The inclined sections of the two heat pipes penetrate through the front side wall and the rear side wall of the explosion-proof shell correspondingly and extend out of the explosion-proof shell, and heat dissipation fins are installed on the outer sides of the ends, located outside the explosion-proof shell, of the two heat pipes correspondingly. The left end and the right end of the explosion-proof shell are respectively provided with a cable lead-in device and two cable lead-out devices, the upper end of the base is provided with a transformer and a rectifier, and the low-voltage side of the transformer is connected with the rectifier. According to the power supply device, the heat dissipation performance of the power supply device can be effectively improved, meanwhile, a low-voltage direct-current power supply can be output in the environment of being connected with 220V alternating current, the low-voltage direct-current power supply is directly provided for the explosion-proof lamp, and the safety is better.

Description

Technical Field

[0001] The present invention relates to the technical field of explosion-proof electrical equipment, and in particular to a low-voltage direct current power supply device for explosive environments. Background Art

[0002] An explosion-proof power supply is a special type of power supply that can operate safely in hazardous environments where explosive gases or dust are present. The casing of an explosion-proof power supply is designed to withstand the pressure generated by an internal explosion without breaking, thereby preventing the flame and explosive gas mixture from spreading to the external environment. This design allows explosion-proof power supplies to be used in industries such as petroleum, chemical, mining, natural gas extraction, food and beverage, and pharmaceuticals.

[0003] The cavity of a traditional flameproof power supply relies on the metal casing for heat conduction. When running at high power, heat easily accumulates inside, resulting in low safety. Therefore, technicians in this field are in urgent need of a flameproof power supply device with good heat dissipation. Summary of the Invention

[0004] The purpose of the present invention is to provide a low-voltage DC power supply device for explosive environments, which can not only effectively improve the heat dissipation performance of the power supply device, but also output low-voltage DC power in an environment connected to 220V AC power, directly providing low-voltage DC power for explosion-proof lamps, and improving safety.

[0005] The above technical objectives of the present invention are achieved through the following technical solutions:

[0006] A low-voltage DC power supply device for explosive environments comprises a flameproof enclosure with a hollow interior and openings at upper and lower ends, wherein an upper cover plate and a lower cover plate are fixed to the upper and lower ends of the flameproof enclosure by bolts, respectively;

[0007] A base is provided at the upper end of the lower cover plate, and two groups of mutually symmetrical heat pipes are provided at the upper end of the base, each group of heat pipes including at least four heat pipes, the heat pipes including a horizontal section and an inclined section, the horizontal section being provided at the upper end of the base, and the angle between the inclined section and the horizontal plane being 15°-18°, the inclined sections of the two groups of heat pipes respectively passing through the front and rear side walls of the flameproof enclosure and extending to the outside of the flameproof enclosure, the inclined sections of the two groups of heat pipes passing through the side walls of the flameproof enclosure are fixed to the flameproof enclosure by glass-to-metal seals and form a seal, and heat dissipation fins are installed on the outer sides of one end of the two groups of heat pipes located outside the flameproof enclosure;

[0008] A cable introducer and two cable lead-outs are respectively provided at the left and right ends of the flameproof enclosure, and the cable introducer introduces the AC cable connected to the AC power supply into the flameproof enclosure; a transformer and a rectifier are provided at the upper end of the base, the high-voltage side of the transformer is connected to the AC cable, and the low-voltage side of the transformer is connected to the rectifier, and the output end of the rectifier is connected to two DC cables, which are respectively led out of the flameproof enclosure through two cable lead-outs.

[0009] The present invention is further configured as follows: a boss with a triangular cross-section is respectively provided on the inner and outer sides of the front and rear side walls of the explosion-proof enclosure, and the inclined surface of the boss is perpendicular to the inclined section of the heat pipe; a through-hole with an internal thread corresponding to the position of the heat pipe is provided at the position of the boss, the inclined section of the heat pipe passes through the glass-metal seal and is fixed thereto, the outer side of the glass-metal seal is provided with an external thread adapted to the through-hole, and the glass-metal seal is fixed to the explosion-proof enclosure through the through-hole.

[0010] The present invention is further configured as follows: a locking nut is threadedly connected to the end of the glass-to-metal seal, and an annealed copper gasket is provided between the locking nut and the inclined surface of the boss.

[0011] The present invention is further configured as follows: a groove corresponding to the position of the heat pipe is provided at the upper end of the base, and the horizontal section of the heat pipe is welded in the groove by means of thermally conductive solder paste.

[0012] The present invention is further configured as follows: the heat pipe is a copper sintered heat pipe, and the working fluid of the heat pipe is acetone.

[0013] The present invention is further configured such that the surface of the heat dissipation fins is coated with a graphene thermal conductive coating.

[0014] The present invention is further configured such that: the cable introducer and the cable outlet are both explosion-proof cable glands.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] First, the power supply device of the present invention adopts heat pipe-fin composite heat dissipation. The heat pipe evaporation section is located below the transformer and rectifier. The heat generated by the transformer and rectifier is transferred to the heat pipe evaporation section. The working fluid inside the heat pipe absorbs heat and vaporizes, then flows to the condensation section to release heat and condense into liquid. The heat is transferred to the cooling fins for heat dissipation. While the heat dissipation efficiency is effectively improved, the spark hazard brought by traditional cooling fans is effectively avoided, and the safety is better.

[0017] Secondly, the heat pipe inside the power supply device of the present invention includes a horizontal section and an inclined section. The angle between the inclined section and the horizontal plane is 15°-18°. While ensuring the heat dissipation efficiency, it can also effectively reduce the longitudinal space occupied by the power supply device, and has better applicability.

[0018] Third, the power supply device of the present invention is connected to 220V AC power when in use and outputs low-voltage DC power. It can directly provide low-voltage DC power to explosion-proof lamps in explosive environments, so that there is no need to install electrical components such as transformers and rectifiers inside the explosion-proof lamps, effectively reducing the failure rate of explosion-proof lamps, reducing the maintenance frequency of explosion-proof lamps, reducing the internal heat source of explosion-proof lamps, and improving safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a perspective view of the present invention;

[0020] Figure 2 is a diagram of the internal structure of the power supply device of the present invention;

[0021] Figure 3 It is a partial structural stereogram of the present invention;

[0022] Figure 4 It is a partial structural cross-sectional view of the present invention;

[0023] Figure 5 is a side view of the present invention;

[0024] Figure 6 It is a schematic diagram of the electrical connection relationship of the present invention.

[0025] In the figure: 1. Flameproof enclosure; 11. Upper cover; 12. Lower cover; 13. Base; 131. Groove; 14. Support; 15. Boss; 2. Heat pipe; 21. Horizontal section; 22. Inclined section; 23. Glass-to-metal seal; 24. Locknut; 25. Annealed copper gasket; 26. Heat sink fin; 3. Cable introducer; 31. AC cable; 4. Cable outlet; 41. DC cable; 5. Transformer; 6. Rectifier. DETAILED DESCRIPTION

[0026] The present invention will be further described in detail below with reference to the accompanying drawings.

[0027] In the description of the present invention, it should be understood that the terms "front", "back", "up", "down", "left", "right", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0028] Example 1:

[0029] like Figures 1-6 As shown:

[0030] A low-voltage DC power supply device for explosive environments includes a flameproof enclosure 1 with a hollow interior and open upper and lower ends. An upper cover plate 11 and a lower cover plate 12 are fixed to the upper and lower ends of the flameproof enclosure 1 by bolts.

[0031] A base 13 is provided at the upper end of the lower cover plate 12, and two groups of mutually symmetrical heat pipes 2 are provided at the upper end of the base 13. Each group of heat pipes 2 includes eight heat pipes 2. The heat pipes 2 include a horizontal section 21 and an inclined section 22. The horizontal section 21 is provided at the upper end of the base 13. The angle between the inclined section 22 and the horizontal plane is 15°. The inclined sections 22 of the two groups of heat pipes 2 respectively penetrate the front and rear side walls of the flameproof enclosure 1 and extend to the outside of the flameproof enclosure 1. The inclined sections 22 of the two groups of heat pipes 2 penetrate the side walls of the flameproof enclosure 1 and are fixed to the flameproof enclosure 1 through glass-metal seals 23 to form a seal. The outer sides of the ends of the two groups of heat pipes 2 located outside the flameproof enclosure 1 are both equipped with heat dissipation fins 26.

[0032] Specifically, a support 14 is provided at the upper end of the lower cover plate 12 of the present invention, and a base 13 is provided at the upper end of the support 14; a groove 131 corresponding to the position of the heat pipe 2 is provided at the upper end of the base 13, and the horizontal section 21 of the heat pipe 2 is welded in the groove 131 by a thermally conductive solder paste. The heat pipe 2 is a copper sintered heat pipe 2, and the working fluid of the heat pipe 2 is acetone.

[0033] Specifically, a boss 15 with a triangular cross-section is respectively provided on the inner and outer sides of the front and rear side walls of the explosion-proof enclosure 1 of the present invention, and the inclined surface of the boss 15 is perpendicular to the inclined section 22 of the heat pipe 2; a through-hole with an internal thread corresponding to the position of the heat pipe 2 is provided at the position of the boss 15, and the inclined section 22 of the heat pipe 2 passes through the glass-metal seal 23 and is fixed thereto, wherein the heat pipe 2 and the glass-metal seal 23 are airtightly connected by high-frequency induction sintering, and the outer side of the glass-metal seal 23 is provided with an external thread adapted to the through-hole, and the glass-metal seal 23 is fixed to the explosion-proof enclosure 1 through the through-hole.

[0034] The arrangement of the boss 15 can enhance the structural strength of the flameproof enclosure 1 at the location where the heat pipe 2 passes through the wall.

[0035] It should be noted that the number of heat pipes 2 in each group of heat pipes 2 of the present invention can be four, five, six or more, and can be increased according to actual conditions. In this embodiment, eight heat pipes are provided, which does not affect the protection scope of the present invention.

[0036] A cable introducer 3 and two cable outlets 4 are respectively provided at the left and right ends of the flameproof enclosure 1. The cable introducer 3 introduces the AC cable 31 connected to the AC power supply into the flameproof enclosure 1; a transformer 5 and a rectifier 6 are provided at the upper end of the base 13. The high-voltage side of the transformer 5 is connected to the AC cable 31, and the low-voltage side of the transformer 5 is connected to the rectifier 6. The output end of the rectifier 6 is connected to two DC cables 41, and the two DC cables 41 are respectively led out of the flameproof enclosure 1 through the two cable outlets 4.

[0037] Specifically, the cable introducer 3 and the cable outlet 4 in this embodiment are both explosion-proof cable glands.

[0038] Example 2:

[0039] As a further preferred embodiment of the present invention, the features of this embodiment that are the same as those of Embodiment 1 are not repeated here. The differences are as follows:

[0040] like Figure 4 As shown, in this embodiment, a locking nut 24 is threadedly connected to the end of the glass-to-metal seal 23 , and an annealed copper gasket 25 is provided between the locking nut 24 and the inclined surface of the boss 15 .

[0041] By adopting the above technical solution, the structural stability of the heat pipe 2 passing through the wall is further improved, and the safety is improved.

[0042] The surfaces of the heat dissipation fins 26 in this embodiment are coated with a graphene thermal conductive coating, which further improves the heat dissipation effect.

[0043] In this embodiment, the angle between the inclined section 22 of the heat pipe 2 and the horizontal plane is 16°.

[0044] It should be noted that the angle between the inclined section 22 of the heat pipe 2 of the present invention and the horizontal plane can also be 16°, 17° or any value within the range of 15°-18°, which does not affect the scope of protection of the present invention.

[0045] According to actual measurements, the relationship between the inclination angle of heat pipe 2 and the reflux velocity of the working medium is shown in Table 1:

[0046] Table 1:

[0047] Tilt angle θ Gravity component ratio (sinθ) Measured reflux rate (acetone) 0° 0％ 0.3m / s (capillary force only) 15° 26％ 0.8m / s 30° 50％ 1.1m / s (occupies large space)

[0048] As can be seen from the data in Table 1, for heat pipe 2 with acetone as the working fluid, when the inclination angle of heat pipe 2 is 0°, the condensed working fluid refluxes solely by capillary force, resulting in a slow reflux rate. When the inclination angle of heat pipe 2 is 30°, although the working fluid refluxes faster, there is a risk of drying up in the evaporation section (liquid working fluid accumulates in the condensation section), and the longitudinal space occupied by heat pipe 2 is also increased. When the inclination angle of heat pipe 2 is 15°, gravity and capillary force work together, resulting in a better reflux rate for the working fluid.

[0049] In addition, in a vibration environment, the 15° inclination design of the heat pipe 2 can also prevent the working medium from being retained, while a 0° inclination will cause the working medium to flow back to the terminal, affecting heat dissipation. Therefore, the inclined section 22 of the heat pipe 2 of the present invention adopts an inclination design of 15°-18°, which can ensure the heat dissipation effect while reducing the space occupied by the heat pipe 2, and at the same time maintain a good heat dissipation effect in a vibration environment.

[0050] Partial structural assembly instructions of the power supply device of the present invention:

[0051] When assembling the power supply device of the present invention, the heat pipe 2 and the glass-to-metal seal 23 must first be fixed. Specifically, the heat pipe 2 and the glass-to-metal seal 23 are airtightly connected through high-frequency induction sintering. The glass-to-metal seal 23 is then fixed to the explosion-proof housing. After the inclined section 22 of the heat pipe 2 is installed, the lower cover 12 is installed. At this time, the horizontal section 21 of the heat pipe 2 is placed in the groove 131 on the base 13. The horizontal section 21 of the heat pipe 2 is welded to the base 13 using thermally conductive solder paste. Then, the transformer 5 and rectifier 6 are installed.

[0052] The above embodiments are merely partial embodiments of the present invention and are not intended to limit the present invention in any form. Any person skilled in the art can, without departing from the scope of the present invention, utilize the methods and technical contents disclosed above to make many possible changes and modifications to the technical solutions of the present invention, or modify them into equivalent embodiments with equivalent changes. Therefore, any simple modification, equivalent replacement, equivalent change, and modification of the above embodiments made in accordance with the technical essence of the present invention without departing from the content of the technical solutions of the present invention shall still fall within the scope of protection of the technical solutions of the present invention.

[0053] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A low-voltage DC power supply device for explosive environments, comprising a flameproof enclosure (1) having a hollow interior and openings at upper and lower ends, wherein an upper cover plate (11) and a lower cover plate (12) are fixed to the upper and lower ends of the flameproof enclosure (1) by bolts, respectively, and characterized in that: The upper end of the lower cover plate (12) is provided with a base (13), and the upper end of the base (13) is provided with two groups of mutually symmetrical heat pipes (2), each group of heat pipes (2) includes at least four heat pipes (2), and the heat pipes (2) include a horizontal section (21) and an inclined section (22), the horizontal section (21) is provided at the upper end of the base (13), and the angle between the inclined section (22) and the horizontal plane is 15°-18°, and the inclined sections (22) of the two groups of heat pipes (2) respectively penetrate the front and rear side walls of the flameproof shell (1) and extend to the outside of the flameproof shell (1), and the inclined sections (22) of the two groups of heat pipes (2) penetrate the side walls of the flameproof shell (1) and are fixed to the flameproof shell (1) through a glass-metal seal (23) to form a seal, and the outer side of one end of the two groups of heat pipes (2) located outside the flameproof shell (1) is provided with a heat dissipation fin (26); A cable introducer (3) and two cable outlets (4) are respectively provided at the left and right ends of the flameproof enclosure (1), and the cable introducer (3) introduces an AC cable (31) connected to an AC power source into the flameproof enclosure (1); a transformer (5) and a rectifier (6) are provided at the upper end of the base (13), the high-voltage side of the transformer (5) is connected to the AC cable (31), and the low-voltage side of the transformer (5) is connected to the rectifier (6), and the output end of the rectifier (6) is connected to two DC cables (41), and the two DC cables (41) are respectively led out of the flameproof enclosure (1) through the two cable outlets (4).

2. The low-voltage DC power supply device for explosive atmospheres according to claim 1, characterized in that: A boss (15) with a triangular cross-section is respectively provided on the inner side and the outer side of the front and rear side walls of the flameproof enclosure (1), and the inclined surface of the boss (15) is perpendicular to the inclined section (22) of the heat pipe (2); a through hole with an internal thread corresponding to the position of the heat pipe (2) is provided at the position of the boss (15), and the inclined section (22) of the heat pipe (2) passes through a glass-metal seal (23) and is fixed thereto; an external thread matching the through hole is provided on the outer side of the glass-metal seal (23), and the glass-metal seal (23) is fixed to the flameproof enclosure (1) through the through hole.

3. The low-voltage DC power supply device for explosive atmospheres according to claim 2, wherein: The end of the glass-to-metal seal (23) is threadedly connected with a locking nut (24), and an annealed copper gasket (25) is provided between the locking nut (24) and the inclined surface of the boss (15).

4. The low-voltage DC power supply device for explosive atmospheres according to claim 2, wherein: The upper end of the base (13) is provided with a groove (131) corresponding to the position of the heat pipe (2), and the horizontal section (21) of the heat pipe (2) is welded in the groove (131) by means of heat-conducting solder paste.

5. The low-voltage DC power supply device for explosive atmospheres according to claim 2, wherein: The heat pipe (2) is a copper sintered heat pipe (2), and the working fluid of the heat pipe (2) is acetone.

6. The low-voltage DC power supply device for explosive atmospheres according to claim 2, characterized in that: The surface of the heat dissipation fin (26) is coated with a graphene thermal conductive coating.

7. The low-voltage DC power supply device for explosive atmospheres according to claim 2, wherein: The cable introducer (3) and the cable outlet (4) are both explosion-proof cable glands.

Images