Piston Seals and Rod Seals are important seals used in mechanical equipment. Their main function is to prevent liquid and gas leaks and ensure the normal operation of mechanical equipment. Piston seals and rod seals are usually used in hydraulic and Pressure system, such as hydraulic cylinders and Pneumatic cylinder. The quality and performance of these seals directly affect the efficiency and lifespan of mechanical equipment.
The classification of piston seals and rod seals is mainly based on their material and design structure. According to the different materials, they can be divided into rubber seals, polyurethane seals, polytetrafluoroethylene seals, metal seals, etc. According to the different design structures, they can be divided into unidirectional seals, bidirectional seals, rotary seals, etc.
Rubber seals are a common type of seal, and their main material is rubber. Rubber seals have good sealing performance and wear resistance, and are suitable for medium and low pressure hydraulic systems and Pressure system. Polyurethane sealing element is a high-performance sealing element, and its main material is polyurethane. Polyurethane seals have high wear resistance, high temperature performance and high pressure performance, and are suitable for high-pressure hydraulic systems and Pressure system. PTFE sealing element is a corrosion-resistant sealing element, and its main material is PTFE. PTFE seals have excellent corrosion resistance and high temperature resistance, making them suitable for fields such as chemical and food processing. Metal seals are a type of high-temperature and high-pressure seal, mainly made of metal. Metal seals have high temperature and high pressure performance and corrosion resistance, and are suitable for high temperature and high pressure hydraulic systems and Pressure system.
Unidirectional seals and bidirectional seals are classified based on different sealing directions. A unidirectional seal can only prevent the leakage of liquid or gas from one direction, while a bidirectional seal can prevent the leakage of liquid or gas from both directions. Rotating seal is a type of seal that can rotate and is mainly used for sealing rotating shafts. Rotary seals are divided into unidirectional rotary seals and bidirectional rotary seals.
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An infrared emission tube, commonly referred to as an IR LED, is made up of a semiconductor material that efficiently emits infrared light. Typically, gallium arsenide (GaAs) is used due to its high infrared radiation efficiency. When a forward bias is applied to the PN junction, it allows current to flow, which in turn generates infrared light. The emitted light has a spectral power distribution centered around 830 to 950 nm. As an abbreviation for Light Emitting Diode, LEDs are known for their positive temperature coefficient — meaning that as the current increases, so does the temperature, and vice versa. This thermal feedback can affect performance, especially when the forward current exceeds the maximum rated value, leading to a reduction in infrared output power.
Major manufacturers of infrared wafers include companies such as Guanglei (ED) and Dingyuan from Taiwan, as well as international brands like Korean and Japanese Dova wafers. Domestic options like Shenzhen Orende are also widely used. These components play a crucial role in various applications, including infrared cameras, remote controls, and surveillance systems.
The performance of an infrared emission tube largely depends on the chip's power, which determines the effective emission distance. However, other factors such as the angle of the IR lamp, lens quality, and system design also significantly impact the overall performance of an infrared camera. For long-range applications, it is recommended to use high-quality IR tubes with positive-type chips, such as Taiwan’s 12mil wafers or Japanese alternatives. These provide better night vision and longer reach.
Unfortunately, the market is often flooded with low-cost options, where some manufacturers use lower-quality materials, such as domestic or Taiwanese 10mil or 8mil wafers, or even defective packages, to cut costs. This can lead to inconsistent performance and reduced reliability. For users who require reliable long-distance infrared performance, it is advisable to choose products using premium encapsulated IR tubes, like those from Dingyuan or Guanglei, which offer slower decay and clearer night vision.
