RU21808U1 - FOOT PUMP - Google Patents

Abstract

A foot pump containing upper and lower rigid plates, covered around the perimeter by flexible fur, a spring, suction and discharge valves, characterized in that the spring is installed between the plates in accordance with the condition of coordination of sizes, and the elements for sealing the pump chamber are made of two-stage and round section, while the plates are made with recesses, providing the possibility of hermetic sealing of fur seams connected by an overlap.

Description

Foot pump

The claimed technical solution relates to portable pumps with a muscular drive for pumping air into products.

A known pump containing a housing with an elastic wall, suction and discharge valves and an external line for connecting to the consumer. (See AS No. 165155, publ. 09/15/91, class F 04 B 33/00).

The disadvantage of this pump is that its performance depends on the conflicting properties of the wall - elasticity and rigidity. The rate of absorption of air depends on elasticity, and the rate of expulsion of air on stiffness. As part of this technical solution, performance is limited.

The closest technical solution to the proposed one is the Bravo foot pump. It contains the upper and lower rigid plates covered around the perimeter by flexible fur, a spring, suction and discharge valves and an external line (see the Information Catalog of Bajer No. 9 January-April 2001. A copy is attached).

This pump has insufficient reliability and short service life for two reasons: during the phase of air intake into the pump chamber formed by flexible fur, the latter touches the spring and quickly wears out due to friction against it; the connection of the fur with the plates has insufficient tightness due to the use of a sealant with a trapezoidal section.

F 04 V 33/00

The technical result that occurs when using the claimed utility model is to provide a more tight sealing of the pump chamber and optimal conditions for the ratio of the working elements that make up the pump chamber.

To solve the tasks, the dimensions of the plates, springs and furs, as well as the location of the spring are selected from the matching conditions, in which the fur does not touch the spring at the air suction phase.

To ensure a more tight connection of the fur with the plates, two sealing stages are used, each of which is made in the form of a tight-fitting element of circular cross section.

In addition, for hermetic sealing of fur seams, joined in overlap, plates are made with special pockets.

In FIG. 1 shows a foot pump in general.

In FIG. 2 shows a cross section of the pump along the axis of symmetry of the spring.

In FIG. 3 - elements ensuring the tightness of the connection of the fur with the plate.

The foot pump consists of two rigid plates 1, the upper and lower, the spring 2, the flexible fur 3, covering the plate 1 with the formation of the working chamber of the pump, as well as the suction 4 and discharge 5 valves. The upper and lower plates 1 have brackets 6, with which the plates are connected by an axis 7.

For a more tight connection of the fur 3 with each plate 1 there is a bandage 8, flexible elastic sealing elements 9 with a cross section, providing two stages of sealing. The advantage of the elements 9 and two stages of their installation is that in this case the bandage 8 is uniformly pressed against the side of the plate 1 without distortions and reliably seals the connection.

Flexible fur 3 forms a closed loop, its edges are connected to each other in an overlap. At this point, the thickness of the fur 3 doubles. In order to “equalize the thickness of the fur, special pockets 10 are made in the collar of the plates 1 for laying one layer of fur 3, which also contributes to reliable sealing.

(

The pump operates as follows. By pressing the top plate 1, the volume of the pump chamber decreases. Air from the chamber through the discharge clan 5 is supplied to the pumped object. When the force is removed from the top plate 1 under the action of the spring 2, the chamber volume increases and air through the suction valve 4 enters the chamber.

In the suction phase, fur 3 bends into the interior of the chamber. In order to prevent friction of the fur 3 against the spring 2, the dimensions of the plates 1, the springs 2 and the place of its installation are selected from the condition of coordination of sizes, which can be written in the following form: b - d h; where b is the width of the upper and lower plates

2 2h - the height of the fur,

When this condition is met, the fur does not touch the spring, even in the most extreme case, when the spring is fully compressed and the fur is tucked inside the chamber.

In a longitudinal section, the place of installation of the spring is moved away from the fur so that the fur does not reach the spring, that is, by the value of h check, where h check is the maximum height of the fur.

Author JTn (4 / nig A.I. Pantyukhin 06/05/01

.

d is the outer diameter of the spring.

Claims (1)

A foot pump containing upper and lower rigid plates, covered around the perimeter by flexible fur, a spring, suction and discharge valves, characterized in that the spring is installed between the plates in accordance with the condition of coordination of sizes, and the elements for sealing the pump chamber are made of two-stage and round section, while the plates are made with recesses, providing the possibility of hermetic sealing of fur seams connected by an overlap.