SU1564378A1 - Crank pump - Google Patents

Abstract

The invention relates to pump engineering and can be used in pumps equipped with pneumatic compensators for equalizing the volume feed pulses. The aim of the invention is to improve the reliability and durability of the elements of the pump inlet tract and the safety of its operation by eliminating the possibility of hydraulic shock when the safety valve is activated. The pump contains inlet and exhaust manifolds, a pneumatic compensator with a direct gas-liquid contact, having a housing 7 with a liquid 8 and a gas 9 cavities, a safety valve (PC) 10 connected to the exhaust manifold, and a drain pipe 13 connecting the output of the PC 10 s gas cavity 9. When the PC 10 triggers, the energy of the pumped medium is quenched in the gas cavity 9 and the water hammer in the intake manifold does not occur. 2 Il.

Description

The invention relates to a pump construction, in particular, to crank pumps, having pneumatic compensators for typing volume delivery pulses.

The purpose of the invention is to improve the reliability and durability of the elements of the pump inlet tract and the safety of its operation by eliminating the risk of hydraulic shock when the safety valve is activated.

FIG. 1 shows a pump, a general view; in fig. 2 is a circuit for connecting a safety valve to the intake and exhaust manifolds.

The crank pump contains a drive part with a gearbox 1, a hydraulic unit 2 including cylinder 3, (black 4, inlet 5 and exhaust 6 manifolds, pneumatic compensator with a cylindrical body 7 having a liquid 8 and gas 9 cavities with a direct gas-liquid contact and installed vertically on the intake manifold 6 with the liquid cavity 8 connected to it and the gas cavity 9 is located in the upper part of the housing 7, a safety valve 10 with an inlet 11 and an outlet 12 channels, the first of which is connected to the exhaust manifold Oru 6, and the second through the drain pipe 13 gas 9 and 8 liquid cavities of the pneumatic compensator communicated with the intake manifold 5.

The pneumatic compensator is provided with means 14 for controlling and maintaining the level of the liquid in its cavity. The required fluid level is established by injecting compressed air into the gas cavity 9 or by bleeding a part of the compressed air out of this cavity.

The crank pump operates as follows.

With the reciprocating movement of the piston 4, a periodic increase occurs (suction stroke). and a decrease (injection stroke) volume of the cylinder 3.

When performing the suction stroke, the pumped medium from the intake manifold 6 enters the cylinder 3.

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Q 45

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When performing a pumping stroke, the pumped medium from cylinder 3 is displaced by piston 4 to exhaust manifold 6 and further to consumer. The cycles are repeated periodically. The pressure limit value developed by the pump is controlled by the safety valve 10. When the safety valve is triggered

10 flow of the pumped medium from the exhaust manifold 6 through the channels

11 and 12 of the safety valve and the drain pipe 13 is displaced

In the gas cavity 9 of the pneumatic compensator, where due to a sharp increase in the cross section, it loses a significant part of the energy and, mixing with the pumped medium in the liquid cavity 8, enters the intake manifold 5, while due to the loss of energy of the flow in the gas cavity 9, impact in the intake manifold 5 is virtually eliminated.

Claims (1)

Invention Formula A crank pump containing a drive unit with a gearbox, a hydraulic unit with inlet and exhaust manifolds, a pneumatic compensator with a cylindrical body having a liquid and gas cavity with a direct gas-liquid contact and installed vertically on the intake manifold with a fluid cavity connected to it and the gas cavity in the upper housing parts, safety valve with inlet and outlet channels, the first of which is connected to the exhaust manifold, and the second through a drain pipe communicated with the intake manifold, characterized in that, in order to increase the reliability and durability of the elements of the pump inlet tract and the safety of its operation by eliminating the possibility of water hammer when the safety valve is activated, the drain pipe of the latter is in communication with the intake manifold using the gas cavity of the pneumatic compensator; connected to a gas cavity in the upper part of the pneumatic compensator housing. Editor A.Dolinich Compiled by V. Chashkin Tehred L. Serdyukova Order 1148 Circulation 489 VNIIPI State Committee for Inventions and Discoveries at the State Committee on Science and Technology of the USSR 113035, Moscow, Zh-35, Raushsk nab. 4/5 Production and Publishing Combine Patent, Uzhgorod, st. Gagarin, 101 Proofreader L. Beskid Subscription