RU2194878C1 - Combination pumping unit - Google Patents

Abstract

FIELD: hydraulic machine building. SUBSTANCE: proposed pumping unit is designed for transportation of liquid at high pressure built by centrifugal pump liquids of high specific weight such as abrasive hydraulic mixtures. Unit has separation chamber block with separator of liquids and valve box connected with chambers, and also pump for delivering working liquid. Centrifugal pump is used as pump to deliver working liquid. Liquid separator is made in form of tubular elastic rolling diaphragm one end of which is clamped in joint between flanges of separation chamber cylinders and other end is hermetically secured in holder. First provides smooth delivery of working liquid, and second, reliably separates spaces of handled and working liquids. Invention provides transportation of handled liquid at high pressure over considerable distances. EFFECT: improved operation reliability of unit. 3 cl, 4 dwg

Description

 The invention relates to the field of hydraulic engineering, in particular to hydraulic pumping units equipped with chambers for separating the pumped liquid from the working fluid. It is designed to transport liquids under high pressure, created by a centrifugal pump and operating on liquids with a high specific gravity, and can be used for pumping abrasive hydraulic mixtures.

 A device for pumping abrasive hydraulic mixtures containing a cylinder with a piston, a separation chamber, inside of which is a separator with a guide rod, a spring, valves and pipelines (1).

The disadvantages of the design are:
- poor reliability in operation due to the occurrence of flow pulsation in the pipeline due to exposure to the working fluid by the piston only along the length of its stroke, which contributes to the occurrence of water hammer;
- insufficient isolation of the working fluid from the pumped due to the fact that during the reciprocating movement of the piston, the liquids in the cavities above and below the piston are in a perturbed state and as a result, they easily penetrate from one cavity to another.

 The closest in technical essence to the proposed one is a device for pumping pulp, including a separation chamber mounted vertically with a liquid separator, a valve box connected to the separation chamber, a pump for supplying working fluid, pipe fittings and a container (2).

The main disadvantages of the device include:
- unsatisfactory reliability in operation due to the occurrence of flow pulsation in the pipeline due to exposure to the working fluid by the piston only along the length of its working stroke, which contributes to the occurrence of water shocks and, ultimately, leads to the destruction of the components and parts of the device and pipeline;
- insufficient isolation of the pump cavity from the pumped liquid, due to its penetration through the annular gap between the floating plate and the chamber wall into the pump cavity;
- its unsuitability for transporting liquids over long distances and under high pressure due to the occurrence of water shocks that destroy pipelines.

 The objective of the invention is to provide a pumping unit with high operational reliability and wide functionality.

 This problem is solved by the proposed combined installation, including a block of separation chambers installed vertically with a liquid separator, a valve box connected to the block of separation chambers, a pump for supplying working fluid, pipe fittings and a tank.

 What is new is that a centrifugal pump is used as a pump for supplying working fluid, the installation is equipped with an additional separation chamber of a similar design connected to the valve box; each chamber consists of two cylinders of larger and smaller diameters, and the liquid separator is made in the form of an elastic tubular rolling diaphragm, which is in cross section closed by ridges around the circumference, one end of the diaphragm is clamped in the junction between the cylinder flanges of the separation chambers, and the other is sealed to mandrel; the valve box is installed and connected to the lower part of the chambers and is made in the form of two-seat inlet and outlet poppet valves, located one above the other, with the seats facing in opposite directions, and the locking elements of both the intake and exhaust valves mounted on common rods; the mandrels are kinematically connected with the locking bodies of the inlet assembly via flexible couplings, springs and actuating levers.

 Also new is the fact that suction and discharge valves are installed in the upper part of the separation chambers, and the side walls of the mandrels are made in a form similar to the shape of an elastic tubular rolling diaphragm.

 In FIG. 1 shows a hydraulic installation diagram; figure 2 is a longitudinal section of the separation chambers; figure 3 is a section along aa of figure 2; in FIG. 4 is a section along BB of FIG. 2.

 The combined pumping unit consists (Fig. 1) of a block of separation chambers 1, a centrifugal pump 2, a tank 3 with a working fluid with a higher specific gravity than the specific gravity of the pumped fluid, injection 4 and drain 5 piping lines.

 The block of separation chambers 1 (Fig. 2) consists of two separation chambers 6 ("A" and "B") mounted vertically, and a valve box connected to them, including inlet 7 and outlet 8 nodes. Each separation chamber 6 consists of two cylinders connected by flanges and made with a large 9 and less than 10 diameters and equipped with an elastic tubular rolling diaphragm 11, which is a cross section of circumferentially closed ridges (Fig. 4), one end of which is sandwiched between the cylinder flanges and the other is sealed to a mandrel 12 made in the form of a disk, the side walls of which have a shape similar to the shape of an elastic tubular rolling diaphragm 11. The inlet assembly 7 consists of two-seat containers flap valves with locking elements 13 and 14 mounted on a common stem 15 with guides 16 and saddles 17 and 18 facing in opposite directions.

 The outlet assembly 8 (Fig. 3) is located above the inlet and also consists of two-seat poppet valves with locking elements 19 and 20, which are connected by a common stem 21. The saddles 22 and 23 also face opposite directions.

 Attached to the mandrel 12 (FIG. 2) is one end of the flexible rod 24, and the other to the spring 25, which in turn is connected with an actuating lever 26, mounted on the axis 27. Each dividing chamber is equipped with a suction 28 and pressure 29 valves.

 The installation works as follows.

 The working fluid (for example, liquid metal) by a centrifugal pump 2 is sent to the cavity "a" of the inlet assembly 7 through the discharge line 4, from where it is directed into the cavity "into the" chamber through the gap "b" formed between the locking member 13 and its seat 17. "A". Under the influence of the pressure of the liquid, the mandrel 12 rises up, while the elastic tubular diaphragm 11 rolls from the inner surface of the cylinder 10 to the inner surface of the cylinder 9. At the same time, the liquid from the cavity "into" chamber "B through the gap" g "and cavity" d " flows into the tank 3. When the mandrel 12 approaches the upper extreme position, the spring 25 begins to stretch and its force through the lever 26 is transmitted to the shut-off member 13. This continues until the force of the spring 25 overcomes the resistance force from the shut-off side about the organ 14. As soon as this force becomes greater than the resistance force, the shut-off element 13 closes sharply and a gap is formed between the shut-off element 14 and its seat 18, through which the working fluid flows from the cavity "a" into the cavity "into the chamber" B ". Under the pressure of the liquid, the mandrel 12 rises up, the locking member 19 sits on its seat 23, and a gap is formed between the locking body 20 and its seat 22 and through it the working fluid from the cavity "into" chamber "A" flows into the tank 3, the mandrel 12 is lowered down, and the elastic tubular diaphragm 11 rolls from cylinder 9 to cylinder 10.

 When lowering the mandrel 12, the pumped liquid (for example, abrasive slurry) through the suction valve 28 enters the separation chamber, and when the mandrel 12 is lifted, it is extruded through the discharge valve 29 into the discharge line 4.

 Subsequently, the cycle repeats.

 The proposed combined pumping unit has increased operational reliability due to the presence of a centrifugal pump in the design, which provides a smooth supply of working fluid, as well as an elastic tubular rolling diaphragm that reliably separates the cavities of the pumped and working fluids.

 The use of a centrifugal pump allows the use of working fluids of a large specific gravity, and this, in turn, makes it possible to transport the pumped liquid under high pressure over considerable distances.

Sources of information
1. RF patent N 2079710, cl. F 04 D 15/02, 1997

 2. US patent N 3241496, CL. 417-98, 1966

Claims (3)

 1. A combined pump installation, including a separation chamber mounted vertically with a liquid separator, a valve box connected to the separation chamber, a pump for supplying a working fluid, pipe fittings and a tank, characterized in that a centrifugal pump is used as a pump for supplying a working fluid; the unit is equipped with an additional separation chamber of a similar design connected to the valve box; each separation chamber consists of two cylinders of larger and smaller diameters, and the liquid separator is made in the form of an elastic tubular rolling diaphragm, which is in cross section closed by ridges circumferentially, one end of the elastic tubular rolling diaphragm is clamped in the junction between the cylinder flanges of the separation chambers, and the second attached tightly to a mandrel made in the form of a disk; the valve box is installed and connected to the lower part of the separation chambers and is made in the form of two-seat inlet and outlet poppet valves located one above the other, with the seats facing in opposite directions, and the locking elements of both the intake and exhaust assemblies seated on common rods; the mandrels are kinematically connected with the locking bodies of the inlet assembly via flexible couplings, springs and actuating levers.  2. The combined pumping unit according to claim 1, characterized in that in the upper part of the separation chambers there are suction and discharge valves.  3. The combined pumping unit according to claim 1, characterized in that the side walls of the mandrels are made in a shape similar to the shape of an elastic tubular rolling diaphragm.

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