How is LED explosion-proof lighting protected?

LED explosion-proof lighting and its principle is the same with the principle of explosion-proof lighting, except that the lamp beads are LED lamp beads, which is to prevent the ignition of surrounding explosive mixtures such as explosive dust environment, explosive gas environment, gas gas, etc. A specific fixture. What are the protective measures of LED explosion-proof lights?
The actual working LED is based on a current limit of 20 mA. However, the current is usually increased due to various reasons during use. If the correct protective measures are not taken, the increased current exceeds a certain level. The time and magnitude will be broken afterwards. For the protection of the LED, we first need to use the fuse, but the fuse is a one-time, and the reaction speed is very slow, so that the effect is also very inconvenient in the process of use, so the fuse is not suitable Used in finished products such as LEDs.
We generally can choose to automatically restore the fuse PTC, and then through experiments, a more reliable method of use is to make the PTC heat lamp beads farther. In the actual circuit we can choose two ways:
1. Shunt protection: general LED and so on is divided into many serial branches, such as 24V, can use seven LED light beads in series and then add a resistor, the current is generally seventeen Up to nineteen milliamperes, depending on the need, an integral multiple of seven light beads can be selected to combine to form a whole lamp. In front of each branch, a PTC element is added for protection. The advantage of this method is the reliability of the protection. Better and more accurate.
2. Overall protection: In front of all the lamp beads are connected a PTC element, for the protection of the entire lamp, this method is relatively simple to handle, does not occupy the volume. This method is quite satisfactory for household products.

Welded Bed Plate For Flanges Of Ship Pipe

The flange welded single-sided seat plate is mainly installed on the top, side wall and bottom of the cabin or cabinet as the entrance and exit of the cabin or cabinet. Valves, accessories or pipes can be installed directly on the single-sided seat plate.

Flange welded single-sided seat plate is suitable for seawater, fresh water, oil, air and steam pipelines below 300 °C. The commonly used nominal diameter is 15~150 mm, and the nominal pressure is lower than 1.6 MPa. The shape of the single-sided seat plate is similar to the corresponding lap-welded Steel Flange.

Flange welded double-sided seat plates are generally used when pipelines pass through decks and tanks, and the two sides of the seat plate are respectively connected to valves, accessories or pipes.
Compared with the single-sided seat plate, the double-sided seat plate has an extra shoulder and double-sided mounting stud bolts. The outer diameter of the shoulder is 10~20 mm larger than that of the corresponding flange, and the thickness of the shoulder is 6~12 mm.
Its scope of application and other structural dimensions are basically the same as those of the single-sided seat plate.
The manufacturing and installation methods of the flange-welded double-sided seat plate are basically the same as the single-sided seat plate, but when the screw holes are drawn, the positions of the upper and lower screw holes of the seat plate must be staggered from each other and must not overlap; deck or bulkhead The diameter of the hole on the top is 2~3 mm larger than the diameter of the seat plate.

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