SU577311A1 - Pump piston - Google Patents

Description

one

The invention relates to a non-gas construction, in particular pumps, the pistons of which are provided with means for compensating the wear of the sealing elements.

A pump piston is known, which contains a core on which an elastic sealing element is installed between the bearing and pushing washers, and an open through-groove is made in the core in the area of the Hc1-clamping washer, which includes a clamping plate with an inclined end surface, the wedge groove in which is located.

In such a piston, only a certain orientation of the piston in space is compensated for wear of the sealing element. This is due to the fact that the wedge moves in the wedge groove of the piston only under the force of gravity of the wedge / as a result, the possibility of using such a piston is significantly limited.

The aim of the invention is to provide compensation for the wear of the sealing element regardless of the spatial orientation of the piston.

This is achieved by the fact that the proposed piston in the wedge has a groove parallel to the inclined plane of the wedge to accommodate a compression spring in it, and an additional groove is made in the core to accommodate a pin in it that interacts with the compression spring.

FIG. 1 schematically shows the proposed piston of the pump, a longitudinal section; in fig. 2 is a section A-A in FIG. one.

The pump piston contains a core on which an elastic sealing element 4 is installed between the support 2 and the pressure 3 washers. In the core in the area of the location of the pressure washer 3 there is a through open groove 5, which includes a clamping plate 6 with an inclined end surface 7, together they form a wedge the groove in which is placed the wedge 8, interacting with the wedge groove and push the puck 3.

The clamping plate 6 is attached to the core 1 by bolts 9. In the wedge 8, a through groove 10 is made parallel to its inclined plane.

Claims (2)

An additional groove 11 is also made in the core 1, in which a pin 12 is installed with limited movement along the piston axis. A compression spring 13 is engaged in a groove 10 and interacts one end with a wedge 8, and the other with a pin 12. When the pump runs, the mating elements wear out a working chamber, in particular a cylinder and a sealing element, which can lead to the appearance of a radial clearance in a pair of cylinder-piston. However, when used in the pump proposed PO1H11NYA, this wear can be compensated as follows. When the pump performs the discharge stroke, the pressure of the pumped medium acts on the pressure washer 3, which, in turn, acts on the elastic sealing element 4, pressing the latter in the direction of the support washer 2. The axially compressed sealing element 4 increases in cross-section, thereby creating a radial tension and, therefore, thereby ensuring tightness of the piston-cylinder interface. As the thrust washer 3 axially moves towards the thrust washer 2, under the force of the spring 13, the wedge moves along the surface 7 of the wedge groove, thereby limiting the ability of the thrust washer 3 to return to its original position after the pressure drops in the working chamber. suction stroke pump. Since the pressure washer 3 cannot return to its original position, the radial tension of the sealing element 4 is preserved and, consequently, the tightness of the piston-cylinder interface is maintained during the suction stroke. The proposed technical solution makes it possible to compensate for the wear of the sealing element, regardless of the spatial orientation of the piston. Claims of the pump The piston of the pump comprising a core on which an elastic sealing element is installed between the bearing and pushing washers, and the core in the area of the pushing washer is provided with a through open groove and a clamping plate with a sloping end surface forming this groove, which together form a wedge groove, in which the wedge is located, about the fact that, in order to compensate for the wear of the sealing element, regardless of the spatial orientation of the piston, a through wedge is made in the wedge of parallel inclined wedge plane for receiving the compression spring therein, and the core is formed an additional slot for receiving therein a pin which interacts with the compression spring. Sources of information taken into account in the examination: 1. USSR Author's Certificate No. 369501, cl. F 16 J 1/02, 1973.