SU1397619A1 - Piston recuperation double-acting pump - Google Patents

Abstract

The invention relates to hydraulic machine building and allows for greater efficiency and stability of the pump flow. Sealing by ski made in the form of resiliently deformable

Description

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in the radial direction of plastic thin-walled sleeves 18, installed anxiated axially with a tension in conjunction with workers of spool 16 of the spool 15. Workers are equipped with leading edges 31, made in the form of radius rounding, sleeves 18, sealed with rubber rings 17 with a circular cross section; remote sleeves 19 are installed. Such an embodiment makes it possible to increase the leaktightness of the disconnection of the existing

under various pressures of the functional cavities of the pump, reducing almost to zero leakage along the mating surfaces of the spool valve. Especially in this case, this pump maintains systems whose workflow implies frequent stops and starts of the pump, since it maintains a certain pressure level in the system during the standstill period, thus excluding non-operating modes of the system for operating parameters. 1 hp F-ly, 1 ill.

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The invention relates to hydraulic engineering.

The purpose of the invention is to increase the efficiency of work, the stability of the feed.

The drawing shows a constructive scheme for a double-acting ryvne pump.

The pump contains differential porgaen 1, installed with the possibility of reciprocating movements in the staggered composite body 2 with the formation of two working chambers 3 and 4, communicated by suction valves 5 and b with the suction path 7 and by means of discharge valves 8 and 9 with the discharge path VO and two recovery chambers 11 and 12, communicated with the return paths 13 and draining 14 of the working fluid through a dispenser 1 located in the bore of the piston 1, which includes a spool 15 with workers acting with the sealing of the bench, made in the bore of the piston 1.

The sealing pushes are made in the form of thin-walled plastic sleeves 18 compacted with rubber rings 17 with a tension in conjunction with workers 16 of the spool 15 and fixed in the axial direction by distance sleeves 19 installed by means of them, with their total fixation by a nut 20 sealed in accordance with the surface of the piston 1 and spool 15 sealing elements 21

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and 22. Dissociation of the recovery chambers 11 and 12 from the working fluid return path 13 is carried out by sealing elements 23. The recovery chambers 11 and 12 are formed. The elements of the piston 1 are equipped with radial drills 24 and 25 supplied to the slide valve. The spool 15 is equipped with an axial channel 26, communicated with the corresponding pads of the spool distributor by radial drills 27 and 28 and with the drain pipe 14 of the working fluid of the radial channel 29.

The spool distributor is connected to the working fluid return path by radial drills 30 made in the piston 1. Workers 16 of the spool 15 are provided with working edges 31 made in the form of radial drills.

The pump works as follows.

In the drawing, the pump is shown in a position close to the completion of the pumping stroke in the working chamber 3 and the suction stroke in the working chamber 4. At the same time, the piston 1 moves to the upper extreme point under the influence of the slide valve 15, which is shifted to the extreme upper position, ensuring the flow of working fluid from the suction path 7 through the suction valve 6 into the working chamber 4 and the displacement of the working fluid from the working chamber 3 through the discharge valve 8 into the discharge path 10. At the same time, part of the working fluid passed through the system under pressure The pump enters the working fluid return path 13 and then through radial drills in spacer sleeves 19, radial gaps between the surfaces of spacer sleeves 19, thin-walled plastic sleeves 18 and spool 15, radial drills 25 in piston 1 enters the recovery chamber 12, and from the river of the operating chamber 11, the working fluid is displaced under pressure by the drain through the radial drills 24 in the piston 1, the radial drills in the distance sleeve 19, the radial gaps between the surfaces of the distance sleeve 19, t nkostennoy plastic sleeve 18 of the piston 1 and the slide valve 15, radial bores 27, axial bore 26 and radial hole 29 of the spool 25 in the discharge path 14 of working fluid.

Due to the pressure drop on the forming surfaces of the recovery chambers 11 and 12 of the surfaces of the piston 1, the force is opposite to the force due to the pressure drops on the working surfaces of the working chambers 3 and 4 of the piston, compensating for it and thereby reducing the value of the resulting force overcome by the action of the spool 15 on the piston 1.

During the return stroke of the piston 1, the displacement of the spool 15 first takes place, under the influence of which the piston begins to move in the direction of the lower extreme point. At 3TONf, the working chamber 3 through the suction valve 5 is filled with the working fluid from the suction path 7, and from the working chamber 4 the fluid is displaced through the discharge valve 9 into the discharge path 10.

At the same time, due to the preliminary displacement of the spool 15, part of the working fluid under pressure from the discharge pressure comes from the working fluid return path 13 via identical communication channels described above to the recovery chamber, and the working fluid is displaced from the recovery chamber 12 under the drain pressure identical to those described above communication channels to the path 14 for discharging the working fluid, due to the pressure drop across the forming recuperative chambers II and 12 surfaces of the piston 1, force and c. that case

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continuously opposed to the force caused by the pressure drop across the working chambers 3 and 4 of the surfaces of the piston 1, thereby reducing the value of the resultant force due to the jaw action of the spool. Further cycles are repeated.

Performing the outer sealing of the spool distributor in the form of radially elastically deformable thin-walled bushings, coupled with pressure from the working spool of the valve, makes it possible to improve the leak-tightness of uncoupling under different pressure of the functional cavities of the piston recuperadion double-acting pump, and the double action of the double valve. almost to zero leakage across the mating surfaces of the spool valve, thereby increasing the efficiency of the recovery pump.

Especially s (in this case, service is maintained by the pump 5 of systems whose workflow involves private stops and starts of the pump, since it ensures the maintenance of a certain pressure level in the system during the parking period, thus excluding unproductive modes of system output for operating parameters.

In addition, it improves the stability of the differential supply of it, as the difference between the total supply and supply of working fluid to the recovery chambers, regardless of the nature of the pumped liquids in part of the fluid parameters and their temperature conditions, since the normalized clearances and resulting flow of working fluid are excluded from the design. fluids in the spool valve.

The thin-walled radially deformable thin-walled bushings of the outer sealing seals of the spool valve are not subject to strict tolerance requirements, which increases the manufacturability of the pump as a whole.

Claims (1)

1. A double-acting piston recovery pump comprising a differential piston mounted in a stepped housing with the formation of two working chambers, suction 513 and discharge paths, as well as return and drain lines for the working fluid, two recovery chambers communicated with the return and drain paths by means of a distributor located in the bore with sealing strip, including a spool with working bits interacting with sealing strip, characterized by that, in order to improve the working efficiency, the stability of the feed and the manufacturability of the production, the sealing is differently made in the form of elastically deformable in the radial direction 6 The research institutes are thin-walled, fixed in the axial direction with tension in conjunction with the workers of the spool, and the workers of the spool are equipped with lead-in edges. 2, A pump according to Claim 1, characterized in that distance-bearing sleeves are installed between thin-walled bushings, and the lead-in edges of the workers of the spool are made in the form of radial situations, the thin-walled sleeves are made of plastic and sealed with rubber rings of circular cross-section.