Submersible pump winter shopping safety performance of the first place

Sichuan Provincial Bureau of Quality Supervision recently in the province of water pump manufacturers to produce a special spot checks. Including small submersible pump 19, submersible sewage pump 13 groups, submersible screw pump 2, submersible pump with a group of wells, of which 29 were qualified, with a pass rate of 82.9% over the same period increased by 23.3% . Therefore, the safety performance is still the weak link of submersible pump product quality. For buyers, the procurement process needs to pay attention to the following aspects: 1, materials: most companies to reduce costs, lack of motor materials and the selection of inferior materials, procurement need to identify the material selection; 2, selection: the hydraulic model of the pump needs to go through Design selection, pay attention to view the product processing technology and assembly quality; 3, wear: impeller mouth ring, bearing and shaft seal mechanical friction loss easily lead to product failure, timely experiments are very important. In summary, the safety of submersible pumps has become a key purchase step. The Xiaobian special recommended several sub-brand quality submersible pump, easy to buy submersible pump! Beluga pump valve operation department is under the Guangdong Wanshun enterprises. Mainly engaged in sales of pumps, valves and pipe fittings, instruments and so on. Cooperative companies are: Co Yu pump factory, Beijing whale Teng Industrial Pump Manufacturing Co., Ltd., Beijing Pump Factory, Mudanjiang Valve Plant, Valve Plant in Fuzhou, Xi'an Pump Valve Plant, Hebei Valve Manufacturing Co., Ltd., Japan KITZ, Japan YS ', Japan gourd fittings, Taiwan 317 and so on.

LED Lights

LED Lamp Bead light-emitting principle

The terminal voltage of the PN junction constitutes a certain potential barrier. When the forward bias voltage is applied, the potential barrier drops, and the majority carriers of the P region and the N region diffuse to each other. Since the electron mobility is much larger than the hole mobility, a large number of electrons will diffuse into the P region, which constitutes the injection of minority carriers into the P region. These electrons recombine with holes in the valence band, and the energy obtained during recombination is released in the form of light energy. This is the principle of PN junction light emission.

Features of LED Lamp Beads

1. Voltage, LED lamp beads use low-voltage Power Supply, and the power supply voltage is between 2 and 4V, which varies according to different products, so it is driven by a high-voltage power supply. Safer power supply, especially for public places.

2. Current, the working current is between 0 and 15 mA, and the brightness becomes brighter with the increase of the current.

3. Efficiency, energy consumption is reduced by 80% compared with incandescent lamps with the same luminous efficiency.

4. Applicability, very small, each unit LED chip is 3 to 5 mm square, so it can be prepared into various LED lamp bead shaped devices, and is suitable for variable environments.

5. Color, changing the current can change color. The light-emitting diode can easily adjust the energy band structure and band gap of the material through chemical modification methods to realize red, yellow, green, blue and orange multi-color luminescence. For example, an LED that is red when the current is small, can turn orange, yellow, and finally green as the current increases.

Led Lights,In-Line Led Light Emitting Diode,In-Line Led Short Feet,1W High Power Lamp Beads

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