Balanced buffer type three-way temperature control valve

Abstract

A balanced buffer type three-way temperature control valve is installed on a diesel engine cylinder sleeve cooling water pipeline system and comprises a valve body, a valve rod, a valve clack and a buffer. The inner space of the valve body is divided into a first cavity, a second cavity and a third cavity, the buffer comprises a buffer piston and a shell, and the shell is fastened to the lower portion of the valve body. The buffer piston is arranged in the shell and divides the inner space of the shell into an upper space and a lower space, and the lower space communicates with the second cavity through a pipeline so that the pressure of cooling water in the lower space is the same as that of cooling water in the second cavity. The lower end of the valve rod extends into the shell and is fixedly connected with the buffer piston, the pressure difference formed by the cooling water on the upper portion and the lower portion of the buffer piston is offset by the pressure difference formed by the cooling water on the upper portion and the lower portion of the valve clack, so that stress of the valve rod is balanced, the position of the valve clack is stable, and the temperature adjusting function of the cylinder sleeve cooling water pipeline system is achieved. According to the balanced buffer type three-way temperature control valve, the pressure difference between the upper face and the lower face of the valve clack is balanced, the position of the valve clack is stabilized, the temperature adjusting function is achieved, and the operation safety of a diesel engine is improved.

Description

technical field [0001] The invention relates to a component of a marine diesel engine, in particular to a balanced buffer type three-way temperature control valve, which belongs to the technical field of diesel engines. Background technique [0002] With the development of marine diesel engine technology and the improvement of marine EEDI energy efficiency index requirements, diesel engines are forced to continuously improve performance intensity to improve combustion economy. As the cylinder pressure continues to increase, the dew point of the gas inside the cylinder liner of the diesel engine also continues to rise accordingly, and the dew point has increased from the original 180°C to the current 190°C; and most ships currently operate under long-term low-load operating conditions , so the temperature of the cylinder liner wall is low, already below the gas dew point, so that the water vapor will continue to condense out and react with the sulfide in the exhaust gas to fo...

AI Technical Summary

Problems solved by technology

[0009] However, it was found during the test run of the diesel engine that the actual situation is that the cooling water pressure P1 in the second chamber B is not exactly the same as the cooling water pressure P2 in the first chamber A, which will cause the upper and lower sides of the valve disc 4A to deform. Different pressures make the valve stem 4B move up or down, blocking the water inlet of the first chamber A or the second chamber B, and the three-way temperature control valve 4 cannot complete the temperature adjustment normally, thus causing the diesel engine to alarm and affecting Safety of Ship Operation

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