Mechanical sealing device of high-pressure water injection pump

Abstract

The invention discloses a mechanical sealing device of a high-pressure water injection pump. A shaft sleeve is provided with a step, a movable ring assembly is fixed on the outer wall of the shaft sleeve, one end of the movable ring assembly is abutted against the step, an elastic compensation assembly comprises a stationary ring seat, a stationary ring which is embedded on the stationary ring seat, an anti-rotation pin which is arranged on the stationary ring seat and a plurality of small springs, a sealing gland bush is provided with an axial accommodating hole, a plurality of spring holes are uniformly distributed on the circumference, the anti-rotation pin is plugged into the accommodating hole and can float in the axial direction, the small springs are arranged inside the spring holes, one end of each small spring is abutted against the stationary ring seat, the tail end of the stationary ring seat stretches out of the sealing gland bush, the tail end of the stationary ring seat is provided with a clamping spring, the elastic compensation assembly is pre-installed on the sealing bland bush, the inner wall of the sealing gland bush is fixedly provided with a distribution ring, and a plurality of injection holes are uniformly distributed on the distribution ring. The elastic compensation assembly is installed in a stationary manner and free from the influence of centrifugal force, the small springs which are uniformly distributed can result in good floatability, the elastic compensation assembly is pre-installed in the sealing gland bush through the clamping ring, and the injection holes which are uniformly distributed can realize multipoint washing, so that uniformity in cooling can be realized.

Description

technical field [0001] The invention relates to a mechanical seal device of a pump, in particular to a mechanical seal device of a high-pressure water injection pump in oil production. Background technique [0002] Spring-type mechanical seals are widely used in fluid mechanical water pumps with rotary equipment in petrochemical, chemical, thermal power, oil extraction and other industries. The core of the mechanical seal is the stability of the liquid film on the sealing surface of the seal ring. At present, there are various factors affecting the sealing effect in practical applications, especially when it comes to the mechanical seal device of the medium and high pressure water injection pump. There are several main problems: [0003] 1. The large spring compression type mechanical seal is used. Due to the uneven thrust of the large spring, the load on the end face of the seal is easily loaded, resulting in damage to the seal ring. [0004] 2. Single-point flushing is us...

AI Technical Summary

Problems solved by technology

[0003] 1. Use a large spring compression mechanical seal. Due to the uneven thrust of the large spring, it is easy to cause the load on the end face of the seal to be loaded, resulting in damage to the seal ring.

[0004] 2. Single-point flushing is used when cleaning and cooling the sealing part, which may easily cause the seal to be tilted or partially flushed and damaged, shortening the sealing life and shortening the life of the seal.

[0005] 3. Due to the design of the pump body, some water injection pumps cannot use cartridge mechanical seals. Especially when the space of the sealing cavity is short, non-cartridge mechanical seals must be used, and the elastic compensation components are in bulk.

It is easy to produce matching errors during installation, which affects the sealing accuracy, and it is inconvenient to operate when disassembling the pump to replace the seals, which is easy to damage the seals

[0006] 4. The pressure of the sealing chamber of the water injection pump is relatively high, and the sealing ring is prone to deformation of the end face of the graphite sealing ring due to the relatively large pressure difference, resulting in poor fit of the sealing friction surface and premature failure of the seal

[0007] 5. The transmission mechanism of the mechanical seal moving ring assembly of the water injection pump mostly uses cylindrical short pins to transmit power. On the one hand, the pins are not strong enough, and the pins are easy to loose when the pump body vibrates, resulting in power failure.

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