RU2263842C1 - Non-return valve - Google Patents

Abstract

FIELD: machine engineering.

SUBSTANCE: non-return valve includes inlet side working members and outlet side working members. Working members of elastic material are in the form at least of two sleeves. Working member of inlet side is in the form at least of one sleeve with bent outside edges. Said edges are in contact with inner surface of walls of opposite sleeves.

EFFECT: enhanced operational reliability of valve.

2 cl, 7 dwg

Description

The invention relates to the field of mechanical engineering, instrumentation, can be used in medical equipment and is intended for unilateral supply of a working medium (liquid or gas) in hydraulic or pneumatic systems.

Known check valve for fluids with small differences in pressure, consisting of a composite housing with inlet and outlet nozzles and made of elastic material of a membrane disk (patent DE 19545452 C1, application No. 19545452.9, publ. 11/14/1996).

Known non-return valve, selected as a prototype, consisting of a composite housing and a cover with inlet and outlet nozzles placed inside the housing by the working element of the intake side and made of elastic material of a membrane disk (patent US 93/04990 from 05.26.1993, PCT ( WO), A1, 93/24777, 1995, No. 9, p. 37).

In both cases, the disadvantage of these technical solutions is the low throughput, considerable resistance to the movement of the working medium from the side of the membrane disk and the inability to dampen or compensate for pulses of the reverse flow or water hammer when using these valves in hydraulic systems.

The invention is aimed at solving the problem of creating a check valve with a minimum number of moving parts for hydraulic and pneumatic systems. The technical result that can be obtained by carrying out the invention is to increase the reliability of the check valve. It is achieved by the fact that the check valve, comprising a housing and a cover with inlet and outlet nozzles, an inlet-side working element located inside the housing, additionally has an outlet-side working element, while the working elements are made of elastic material in the form of at least two glasses, and the working element of the inlet side is made of at least one glass with the edges bent outward, touching the inner surface of the walls of the opposite glasses.

During operation, the working elements do not move, but only elastically deform. In addition, the design features of the valve allow you to partially or completely dampen hydraulic shocks in hydraulic systems. The working elements of the exhaust side can be made in the form of glasses without bent outward edges.

Figure 1 presents a two-piece valve assembly; figure 2 is a working element of the intake side; figure 3 - working element of the intake side, view from the side of the inlet pipe; figure 4 is a working element of the exhaust side; figure 5 - single-section valve; figure 6 - four-section valve and the path of movement of the working environment; Fig.7 is one of the options of a multi-section valve.

The proposed check valve contains a housing 1, a cover 2, a working element 3 of the intake side, a working element 4 of the exhaust side (Figure 1). The housing 1 is made in the form of a cylindrical glass with an opening in the center of the bottom and with a nozzle 5. The cover 2 is a disk with a central hole and a nozzle 6. The working element of the inlet side 3 is a glass 7 with a continuous bottom, the bottom is made outside In the form of a round cone facing the inlet at the apex, stiffeners 8 are made radially to the sides from the top of the cone, the edges of which extend beyond the outer dimensions of the bottom of the cup and form external stops, the outer diameter of which is equal to the inner the diameter of the body and by means of which the working element is centered and fixed from axial movements inside the valve body by the cover 2. The height of the ribs is greater than the height of the cone, i.e. more thickness of the bottom of the glass in the central part. The width of the stiffeners decreases from the bottom edge to the top of the cone. The walls of the glass 7 have a variable thickness, gradually decreasing from the bottom to the open part. The edges of the glass are bent outward and form an annular edge projecting outward at an angle to the wall of the glass 9. Depending on the valve modification, the working element may consist of one or several glasses of a similar shape, but smaller diameters mounted coaxially on a common bottom (Figs. 1, 5- 7). The working element of the outlet side 4 is made in the form of a cylindrical glass 10 with an opening in the center of the bottom coinciding with the opening of the outlet pipe. The cup 10 is tightly inserted into the valve body 1. Depending on the modification of the valve, the working element of the outlet side can be made in the form of one or more inner cups mounted coaxially on a common bottom. The glasses of the working element of the exhaust side can take various forms:

- a form similar to the shape of the glasses of the working element of the inlet side (Fig.1, 6);

- a similar shape but without bent outward edges (not shown);

- the shape of a cylindrical glass with the same height wall thickness (Fig.7).

Assembled, the check valve consists of the working elements of the inlet side 3 and the outlet side 4 enclosed in the housing 1 with a cover 2, while the working element of the inlet side 3 with the protruding ends of the stiffeners 8 abuts against the edges of the glass 10, and the glass 7 enters the glass 10 and the bent edge 9 touches the inner surface of the walls of the glass 10. In turn, the inner glass 11 enters the glass 7, touching the inner surface of the walls with the bent edge 12. If there are several, coaxially mounted glasses working elements in the inlet and outlet sides, the glasses respectively enter into each other, while the bent edges of the glasses necessarily touch the inner surface of the walls of the opposite glasses (Fig. 1, 5-7).

The check valve operates as follows. The working medium (liquid or gas) enters through the inlet pipe 6 and through the channels formed by the bottom cone, stiffeners 8 and cover 2, enters the cavity between the walls of the glasses 7 and 10. Then, under the influence of the working medium pressure, the bent edge 9 and adjacent to it the wall of the glass 7 is elastically deformed and, through the gap formed, the working medium enters the cavity between the walls of the glasses 7 and 11. Here a similar opening process takes place, and the working medium enters the exhaust cavity, from where the working medium through the outlet pipe 5 and served to the consumer. When pressure drops, the bent edges and walls of the glasses will return to their original position. If the pressure of the working medium in the outlet cavity exceeds the pressure in the inlet cavity, then the bent edge 12 and the adjacent wall of the glass 11 will work in the opposite direction, i.e. under the action of excess pressure, the wall of the cup 11 will stretch and press the bent edge 12 against the inner surface of the wall of the cup 7. If for some reason the seal does not occur, the cup 7 will work similarly. The shape of the locking cups is such that the larger the opposite pressure, the bent edges of glasses are pressed with great effort.

Claims (2)

1. A check valve comprising a housing and a cover with inlet and outlet nozzles, an inlet-side working element located inside the case, characterized in that the valve further has an outlet-side working element, wherein the working elements are made of elastic material in the form of at least two glasses, and the working element of the inlet side is made of at least one glass with the edges bent outward, touching the inner surface of the walls of the opposite glasses. 2. The check valve according to claim 1, characterized in that the glasses of the inlet and outlet sides are made with the edges bent outward, touching the inner surface of the walls of the opposing glasses.

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