SU375431A1 - PLUG SEAL - Google Patents

Description

one

The invention relates to the field of compressor engineering and concerns the improvement of compaction in high pressure compressors.

Plunger seals are known that contain cuffs pressed into the cylinder and sealing rings that are loaded by the pressure of the injected medium.

The purpose of the invention is to improve the reliability of high-pressure compressors, as well as unloading the contact surfaces of the cuffs.

The goal is achieved by the fact that the cuffs, equipped with expanders, are mounted on the plunger with tension and are located on the side of the highest pressure, and the sealing rings are placed between the cuffs. In addition, on cylindrical cuffs on the side opposite to the surfaces of contact with the cylinder and plunger, evenly spaced longitudinal grooves are provided.

FIG. Figure 1 shows a sectional seal of a high pressure compressor; in fig. 2- cuff " contactless sealing in section; in fig. 3 - cuff "cutter: in FIG. 4 is a view of the cuff along arrow A of FIG. 3

As shown in FIG. 1, the seal of the plunger} is placed in the cylinder 2, and the working bore 3 of which provides suction 4 and discharge 5 valves. In the cylinder 2, the channels 6 are provided, which connect the compaction chamber 7 with the cooled injected medium. Chamber 7 separates the seal into two sections. In the left section, located on the side of the working cavity 5, are placed the sealing rings 8 and the cuff “cutter 9. In the section located to the right of the chamber 7, the rings 8 and the cuffs of the“ non-contact type 10 ”are placed. The sealing rings 8 are equipped with expanders // and placed the cage 12; cuffs 10 and 9, with tension installed on the plunger / and in the sleeves 13, are equipped with expanders 14 and 15. To reduce the harmful space, the cavity between the cuff 9 and the expander 15 is filled with elastic heat-resistant material 16, for example rubber. FIG. 2, 3, and 4, the cuffs 9, 10 are shown with grooves 17 formed on cylindrical surfaces on the side opposite to the contact surfaces. At the locations of the grooves 17, thin webs 18 are formed between the contacting surfaces.

When the compressor is running, the left seal section is loaded with a maximum pressure drop equal to the pressure difference between the injection and suction pressure, and the right section is a constant pressure drop equal to the discharge pressure.

During the suction process, the working cavity 3 is filled through the suction valve 4 and partially through the seal of the left section, since the cuff 9 does not interfere with the flow of laz from chamber 7, the pressure of which is equal to the compressor discharge pressure.

During the pumping process, the left seal section is affected by a slight pressure drop, which is perceived by the cuff 9.

In the right sealing section, the pressure from the chamber 7 is perceived by the cuffs 10 and the sealing rings 8. In the cuffs 9 and 10, the gas is throttled through small gaps that form when the thin bridges 18 are deformed, which leads to a decrease in contact stresses between the plunger / and the cuffs. The cooled working medium, which is supplied to chamber 7, makes it possible to increase the reliability of the seal, especially

high pressure without

for compressors cylinder lubrication.

Subject invention

Claims (2)

1. A plunger seal, mainly for high-pressure compressors, containing cuffs pressed into the cylinder and o-rings, loaded by the pressure of the injected medium, characterized by that, in order to increase reliability, the cuffs, equipped with expanders, are installed on the pressure-guided plunger and are located on the side of the greatest pressure, and the sealing rings are placed between the cuffs. 2. A seal according to claim 1, characterized in that, in order to unload the contacting surfaces of the cuffs, on the cylindrical ends of the latter from the side opposite to the contact surface with the cylinder and plunger, evenly spaced longitudinal grooves. / g l VyyXZ %% yy ff / J S Yu 7 ; ffS $ fS: SiSil /////////// Z y / iiiiSf: ffS & ./ f7 Fig.Z FIG 4