The water jacket heater The water jacket heater is a professional preheating device for diesel engine cooling water and lubricating oil. It is a necessary accessory device for diesel engine driving equipment when the working environment may be lower than 4°C. When the operating environment is likely to be lower than 4°C, the lubricating oil and cooling water of the engine may condense into a solid state during the starting stage, losing the effect of lubrication or cooling, thereby damaging the engine.

3. Problems encountered in practical application of ATS and corresponding product solutions As the economy develops, modern life and modern industry are less and less tolerant of power outages. Foreign industrialized countries (especially the United States) regard ATS products as part of the power supply, and are very cautious about the selection and use of ATS products. In the dual power emergency power supply system, first choose PC-level products, and the switch is not allowed to stay in the middle of the conversion process (that is, without zero position). The purpose is to increase the reliability of the power supply, especially for UPS. Due to the different types of backup power and application environments, the ATS selection should also be different. 3.1 Problem 1: Switch synchronization problem Ordinary ATS is not allowed to transfer with large motor or high inductance load. If the large motor load is switched during operation, it will be subject to huge mechanical stress when the power supply phase gap is large. At the same time, the overcurrent caused by the back EMF generated by the motor may cause the fuse to blow or the circuit breaker to trip. Solution: If you choose an ATS with phase angle synchronous detection and switching function, check whether the two power supplies are synchronized before switching if the two power supplies exist at the same time. When the synchronization detection is qualified, the ATS is allowed to switch. At this time, ensure that the back EMF and the about-to-input The mains potentials used are synchronized so that no inrush currents can blow fuses or trip circuit breakers. 3.2 Question 2: Neutral line switching problem when matching with UPS Ordinary three-phase ATS has three-pole and four-pole classification, but the three-pole switch cannot meet the requirements of my country's power supply system that the incoming ATS must be four-pole switching and four-pole isolation. Although the four-pole ATS can meet the above requirements, it does not take into account the adverse effect of the four-pole simultaneous switching ATS on the user's load, especially the single-phase load in actual use. Since the ATS needs to be switched with load, the UPS will automatically switch to the bypass and cause the load to lose power due to the absence of the neutral line at the moment of switching in actual use. Raised and burned. If you choose an ATS with the function of zero line overlap switching (later clutch first make technology), when the phase line ends are arced during the switching process, this structure can ensure that the zero line will not be separated temporarily; and when the switching is about to end, the phase line At the same time as the arc is drawn at the end, the structure can ensure that the zero line has been reliably contacted. During the whole switching process, the phenomenon that the neutral line is vacated will not occur. 3.3 Problem 3: Maintenance and Repair Problems Once the ordinary ATS is p...

Today, let's talk about water-cooled alternators first. "Water cooling" is not the direct cooling of the alternator with water, but a simple term for "air-water indirect cooling", generally referred to as IC81W (IEC60034-6 and GB/T1993 are defined as IC81W, NEMA MG1 is defined as TEWAC, and CACW is used in other places to represent air-water indirect cooling). The water-cooled alternator has the advantages of low noise, high IP protection level, and high reliability in harsh environments. It is very suitable for various ships with high requirements for generator reliability. Let's take a look at the structure and heat dissipation principle of the indirect water-cooled alternator. In the following schematic diagram, the lower half is the body part of the generator, and the upper half is the air-water cooler. The red hot air is driven by the centrifugal fan on the main shaft of the generator, and is extracted from the inside of the generator and enters the cavity of the air-water cooler. It is passed to the cooling water, so that the blue cold air flows out from the other side, and finally enters the inside of the generator, passing through the stator and rotor of the generator, so as to cool the generator. The air only circulates between the generator and the water cooler, which is completely isolated from the outside, so that the generator can prevent solid dust and water from entering the inside of the generator, so that the generator can achieve a high protection level of IP44, and even further After special treatment, it can reach the protection level of IP55. Based on the high reliability required by marine generators, in addition to the generator itself needs to be designed and manufactured in strict accordance with the specifications of the classification society, the air-water heat exchange unit of the water cooler is also a very critical component, which determines the cooling effect of the generator. thereby affecting the output of the generator. The water cooler used in the Stamford® brand generator has the characteristics of high cooling efficiency. When the cooling water temperature reaches 38°C, it can still be used without power reduction. The air-water heat exchange of the water cooler adopts double-layer water pipes and is equipped with a water leakage alarm device, so as to protect the generator from safety risks caused by water leakage. To meet the growing market demand for water-cooled generators, Cummins Generator Technologies has launched the first S7 series water-cooled generators based on the STAMFORD® brand.