Centrifugal pump grease lubrication mechanical seal ring

Abstract

The invention relates to a centrifugal pump grease lubrication mechanical seal ring. The centrifugal pump grease lubrication mechanical seal ring is composed of a pump vortex shell 2, an impeller body25, a pump cover body 8, a fixed ring 16, a fixed ring corrugated groove face 10, a movable ring 15, a movable ring impeller connecting face 17, a movable ring impeller connecting step 19, an oil supply hole 20, a movable ring sealing face 26 and the like. A pump liquid inlet flange face 9 and the oil supply hole 20 are arranged on the pump volute shell 2, the fixed ring 16 is arranged in the pump liquid inlet flange face 9, the fixed ring corrugated groove face 10 and the movable ring sealing face 26 on the fixed ring 16 are lubricated by grease provided by the oil supply hole 20 for the fixed ring corrugated groove face 10 and the movable ring sealing face 26, the movable ring impeller connecting face 17 and a spring 12 in a spring hole 13 in the movable ring 15 pressurize and seal themovable ring sealing face 26 and the fixed ring corrugated groove face 10, so that rotary leakage between the fixed ring corrugated groove face 10 and the movable ring sealing face 26 is prevented, and the industrial technical problem of abrasion and leakage of an existing impeller and sealing ring is thoroughly solved.

Description

technical field [0001] The invention relates to the technical field of fluid machinery, in particular to a grease lubricated mechanical seal ring of a centrifugal pump. Background technique [0002] The reason for the overall low efficiency of the existing centrifugal pumps is that the cavity gap between the sealing ring of the centrifugal pump and the closed impeller front cover plate and the pump volute is relatively large, resulting in the high-pressure fluid at the impeller outlet and the low-pressure fluid at the impeller inlet. The pressure difference between the fluids increases, which in turn increases the amount of fluid leakage, thereby affecting the overall efficiency of the pump. [0003] In order to solve the above defects, the patent CN2628764 discloses a centrifugal pump. An annular pipe body is provided between the pump casing with the water inlet and the impeller. The water port is connected adjustable, and the wear surface is changed to the end face. On th...

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Problems solved by technology

[0002] The reason for the overall low efficiency of the existing centrifugal pumps is that the cavity gap between the sealing ring of the centrifugal pump and the closed impeller front cover plate and the pump volute is relatively large, resulting in the high-pressure fluid at the impeller outlet and the low-pressure fluid at the impeller inlet. The pressure difference between the fluids increases, which in turn increases the amount of fluid leakage, which affects the overall efficiency of its pump

[0003] In order to solve the above defects, the patent CN2628764 discloses a centrifugal pump. An annular pipe body is provided between the pump casing with the water inlet and the impeller. The water port is connected adjustable, and the wear surface is changed to the end face. On the other hand, the outer edge of the pipe body is connected axially with the water inlet. The axial position of the impeller inlet can ensure the original design head index of the water pump, which can better alleviate the above technical defects, but it will be troublesome to manually adjust

[0004] Patent CN2541637 discloses a centrifugal pump mouth ring self-compensating constant clearance sealing structure, which can make the impeller and the sealing mouth ring produce a soft elastic fit, and the gap between the impeller and the sealing mouth ring increases with the degree of wear of the parts. It can self-compensate for wear under the action of pressure, so as to maintain the original constant gap and achieve the sealing effect, which better solves the defect of impeller and sealing ring wear and leakage caused by the hard fit between the impeller and sealing ring. ; However, there is direct friction between the rotating impeller and the rubber sealing ring in this sealing structure, which increases the mechanical friction resistance and consumes energy

[0005] Patent CN205423310U discloses a new impeller of a high-efficiency centrifugal pump, which can reduce the above-mentioned defects of seal ring wear and leakage. The leakage between the gaps is greatly reduced, thereby improving the overall delivery efficiency of the pump; but because the new impeller of the high-efficiency centrifugal pump only reduces the leakage by reducing the gap between the front cavity and the mouth ring, it cannot fundamentally Eliminate the gap leakage between the front cavity and the mouth ring, there is still a defect of partial leakage

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