RU21942U1 - PUMP PISTON - Google Patents

Abstract

1. A pump piston comprising a core with a support collar and a seating surface on which a cuff is installed with an annular groove on a cylindrical surface, characterized in that the annular groove is made on the edge of the cuff, adjacent one side to the back of the cuff in contact with the support collar. 2 . The piston according to claim 1, characterized in that the annular groove is formed by the end of the support collar and the rear surface of the cuff, on which the chamfer is made.

Description

PUMP PISTON

The inventive utility model relates to the field of pump engineering and can be used in piston mud pumps, as well as single and double acting piston hydraulic devices.

A prefabricated piston is known, for example, for mud pumps, on the landing surfaces of the core of which elastic cuffs abutting in the support collar are mounted, held on the core by spring rings (Auth. Certificate. USSR No. 289241 according to class F 16 j 1/00, publ. 08.12. 1970, BI No. 1 for 1971).

Also known is a piston pump with cylindrical bushings for pistons equipped with cuffs fixed to the rods, and at the end of the cylindrical bushings diffusion grooves are made for the protruding ends of the cuffs equipped with annular grooves for gripping the pumped liquid used for lubrication (Auth. Certificate. USSR No. 324411 according to class F 04 f 1/14, published on 02.29.1972, BI No. 2).

The closest technical solution to the claimed one is a prefabricated piston, comprising a core with a support collar and a seating surface, on which an elastic cuff with a bell-shaped front surface and an even back surface adjacent to the support collar and annular grooves on the outer and inner cylindrical surfaces (Auth. USSR No. 732605 according to class F 16 J 1/00, publ. 05/05/1980 BI No. 17).

A disadvantage of the known solution is that when the piston moves, the compressed cuff is deformed, the rubber falls between the cylinder walls and the piston thrust collar. Biting rubber occurs.

The proposed utility model solves the problem of increasing the life of the cuff and reducing operating costs.

To achieve the technical result, a pump piston comprising a core with a supporting collar and a seating surface on which a cuff is installed, the configuration of which is close to the form of natural wear, with an annular groove on a cylindrical surface, and the annular groove is made on the edge of the cuff, adjacent one side to the back part of the cuff in contact with the support collar.

The inventive utility model is illustrated by the drawings shown in FIG. 1-2, where:

figure 1 is a section of a two-lip piston of a monolithic design;

in FIG. 2 is a sectional view of a two-lip assembled piston.

Moreover, the piston of a monolithic design is such a piston on the core of which the cuffs are vulcanized, glued or attached to it in any other way.

An assembly piston is such a piston with removable cuffs mounted on its core.

The piston of the pump consists of a core 1 with a Central hole 2 for connection with the rod. On the core there is a cylindrical shoulder 3 and a seating surface 4, on which grooves are made to hold on it an elastic, for example rubber, cuff 5, having a bell 7 on the front part 6 and an annular groove 8 on the cylindrical surface, made on the edge of the cylindrical surface, adjacent to the rear surface 9 of the cuff, which is in contact with the end part 10 of the support collar 3.

According to the second option (see Fig. 2), the assembled piston consists of a core 1 with a central hole 2 for connection with the rod. On the core there is a cylindrical shoulder 3 and the seating surface 4 with a thread at the end. On the landing surface, elastic, for example, rubber cuffs 5 are installed, having a front surface 6 of various shapes, but mostly flat.

An annular groove 8 is formed between the end surface of the shoulder 10 and the rear surface 9 of the cuff, for which a chamfer 11 is made on the rear surface of the cuff.

Since the cuff 5 is loose-fitting on the piston seating surface 4, it is fixed to it by a nut 12 screwed onto a thread made on the edge of the piston seating surface 4.

Both of the above-described options for the location of the annular grooves on the cuffs extend to the single-lip piston of a single-acting pump.

The piston works as follows. When fluid is displaced from the cylinder, the pressure on the cuff increases, it is compressed and pressed to the piston shoulder, while the material “flows, filling the annular groove, and therefore does not protrude beyond the cylindrical surface of the shoulder.

This prevents the cuff material from getting between the cylinder and the piston shoulder. This eliminates the biting of the rubber and the destruction of the cuff.

USEFUL MODEL FORMULA

1. A pump piston comprising a core with a support collar and a seating surface on which a cuff is installed with an annular groove on a cylindrical surface, characterized in that the annular groove is made on the edge of the cuff, one side adjacent to the back of the cuff in contact with the support collar.

2. Piston pop. 1, characterized in that the annular groove is formed by the end of the support collar and the rear surface of the cuff, on which the chamfer is made.

Pump piston

Claims (2)

1. The piston of the pump, comprising a core with a support collar and a seating surface on which a cuff is installed with an annular groove on a cylindrical surface, characterized in that the annular groove is made on the edge of the cuff, adjacent one side to the back of the cuff in contact with the supporting collar. 2. The piston according to claim 1, characterized in that the annular groove is formed by the end of the support collar and the rear surface of the cuff, on which the chamfer is made.