SU65290A1 - Multistage piston pump for liquefied gases - Google Patents

Description

Whether they are already well-known piston pumps equipped with series-connected cylinders. Such pumps do not break the working pressure into several stages.

The proposed pump has the peculiarity that, in order to break down the total pressure drop across all cylinders, “the previous pipeline insertion tube is inserted into a hermetic suction chamber surrounding the next step.

In FIG. 1 schematically depicts a 1 st longitudinal section of an exemplary execution form on the axis; FIG. 2 - view of Speer | DI; Parts of one of the plunger pump moat “of FIG. 1, and FIG. 3- a cross-sectional section of the cilidra "asosa of fig. one.

Two or more cylinders 7, 2 of the pump are enclosed by IB hermetically sealed suction chambers 5, 4. The discharge pipe 5 of the previous cylinder, for example, is included in the hermetic suction chamber 4 surrounding the second stage cylinder. The suction chamber of the first cylinder / is connected by a pipe 6 1C X | storage of liquefied gas. From cylinder 1, fluid through pipe 5 through injection valve // enters chamber 4. From

the second cylinder 2 through pipe 7, through the discharge valve 8, the liquid enters the corresponding evaporator.

The liquefied gas from the storage enters pipe 6 into chamber 5, flows into cylinder windows 9 / s, is squeezed out by plunger 10 through discharge valve / into chamber 4, from where flows into windows 12 of second cylinder 2 and is squeezed out with tape 13 through valve 8 into the evaporator under necessary working pressure. To unload the seals 14, 15 of the pump, the space below the gland 14 is connected by a channel 16 to the suction chamber 3 of the low pressure cylinder 1. The space under the gland 15 of the cylinder 1 is connected by the channel 17 to the space inside the chamber / under the pressure of the liquefied gas in the storage.

Channel 18 in K (cylinder cover / connects the cavity of the suction chamber 3 to the space above the liquefied gas in the storage), and channel 19 of the cover of cylinder 2 communicates the cavity of chamber 4 with a corresponding gas receiver. Plungers 10 I: 13 are provided at the ends with spiral-shaped grooves 20 (FIG. 2), designed to rotate the plungers around their

liquid axes during the pumping in order to evenly distribute the lubrication according to the internal surfaces of the cylinders 1, 2. The lubricant can be, for example, powdered babbit, supplied each cylinder at several places through the tubes 21 passing through walls of cylinders and suction chambers (Fig. 3).

The design of the OSA provides a breakdown of the pressure drop across all cylinders and the associated improvement in the working conditions of the sealing surfaces between the cylinder and the piston, as the effect of leakage through the gap decreases, as well as the quality requirements of the flare, and the reliability of operation increases.

Subject invention

Claims (4)

1. Multistage piston pump for liquefied gas with sequential switching on of cylinders, which are used to connect the previous pressure stage into the hermetic suction chamber surrounding the cylinder to break down the total pressure drop over all cylinders. subsequent stage. 2. The pump according to claim 1, wherein and in order to unload the pump seals, the spaces under the cylinder seals are connected by channels to the suction chamber of the low pressure cylinder. 3. The pump according to item 1-2, and using the plungers of the spiral-shaped grooves for turning it with liquid jets during injection, in order to evenly distribute the lubricant. 4. In the pump according to claim 3, application for lubricating the plunger of powdered babbit. / U FIG. one 2 /