DE7916217U1 - DOUBLE ACTING PISTON PUMP - Google Patents

Description

LECHLER CHEMIE GMBH '.Γ ". · · · |": · L'

Double acting piston pump

A large number of pump designs are used in the chemical industry.

The type used in the low-viscosity, liquid area is likely to be the centrifugal pump. This type is in its demand characteristic also in use in multi-stage training for higher pressures. This type of pump runs at high speed 1500 3000 Rpm A conveyance of viscous products is not possible,

For low and high viscous substances, including those mixed with abrasive substances The pure positive displacement pump is known to media.

Use in a higher temperature range is possible.

One group of gear pumps, internally and externally geared,

has the disadvantage of very high wear and tear. ,

The group of rotary piston pumps shows better wear behavior, but the technical effort in terms of storage and precision results in considerable price regions.

The group of eccentric screw pumps enables abrasive products to be conveyed, but wear and tear as well not insignificant and a single dry run - leads to immediate failure.

The technical effort is not insignificant, the price is high.

The group of diaphragm pumps is basically suitable for pumping media containing solvents and containing abrasive fillers.

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The pneumatic drive is common, the design effort is very considerable, and the price is high.

The group of metering piston pumps is designed for metering. It is very complicated in structure and high in price.

The puncture criteria shown in the feed pump sector are technically well solved in terms of their function as such and tried and tested.

The object of the invention is to create a technically less complex and inexpensive pump that can be used for the aforementioned Areas of application is universally applicable and has good conveying properties indicates.

The object is achieved by a double-acting piston pump for conveying and charging liquids and Emulsions, in particular of high-viscosity, solvent-based products mixed with abrasive fillers from the Corrosion protection chemistry.

The double-acting piston pump according to the invention consists of

a) a commercially available seamless pipe cross piece (12) with flange (13), two further, laterally arranged Flanges (11, 11a) and a stuffing box receptacle (27) in which a wiper ring made of silicone rubber (28) a Abstreifringaufnähme (29) with behind it Filled granules made of high-polymer tetrafluoroethylene (30), the piston rod guide bearing (3D made of glass fiber-filled high polymer tetrafluoroethylene and the stuffing box lantern (32) are arranged, and those with stud bolts (6) with nuts (7) to hold the stuffing box combination is provided, *

b) a pipe T-piece as the front pump part (25) with flange (21) and zv / el other, _ laterally arranged Splashing (Ha, lic),

c) a cylinder tube (16), which by means of tie rods (1 * 0) between the head-side flanges (13, 21) the pipe wreath piece (12) and the front pump part (25) is clamped,

d) a delivery piston rod (17) with two double cup sleeves (19)

e) a suction pipe (15) with two connections with standard welding flanges (10, 10a), each with an interposed inlet valve (8, 8a) with a lateral Flange (11) of the pipe cross piece (12) or a lateral flange (Ha) of the front pump part (25) are and

f) a pressure pipe (26) with two connections with standard welding flanges (10b, 10c), each with an intermediate inlet valve (8b, 8c) with a lateral flange (Hb) of the pipe cross piece (12) or a lateral flange (lic) of the front pump part (25) are flanged.

The double-acting piston pump according to the invention is particularly suitable for high-viscosity, solvent-based, to promote products enriched with abrasives and other fillers.

Even emulsions that are sensitive to conveying can work without interference be pumped.

The pump is mainly made up of standard fittings and control parts.

The number of wearing parts is limited to a minimum.

Due to the use of quick-release connections (screws, tie rods), the wearing parts are quick and easy to replace. The spare parts can be used without rework.

The pump shows a very good and precise volumetric pumping behavior, so that charging quantities can be selected via the number of strokes can be funded.

The delivery pressure can be varied over a wide range.

This pump is also suitable for conveying the products when filling by weight via a filling valve. It is it is not necessary to switch off the pump when closing the filling valve. The pump is properly controlled, ζ. R. in pneumatic operation, not to be overloaded, as the lifting movement automatically starts when the variably adjustable working air pressure is reached is stopped. If the pressure drops due to the opening of a filling valve or another valve, the stroke movement starts and thus the promotion automatically starts again.

Furthermore, the pulsation delivery characteristics can be smoothed with commercially available pulsation dampers if necessary.

Tests with highly abrasive filler components in the test medium have shown that at a delivery piston speed of 150 mm / sec and 250,000 kg throughput only insignificantly

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Borrowed wear and tear on the main wearing parts (cylinder barrel 16 and cup seals 19) were found. The inlet and outlet valves showed no signs of wear.

The double-acting piston pump according to the invention can be used in any Way to be driven. The pneumatic drive is preferred, with which the pump is unrestricted in all can be operated in potentially explosive areas.

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Structure and function of an advantageous embodiment of the invention are described below and with reference to FIG Drawing explained.

The pump part consists of a) a commercially available seamless pipe cross piece 12, b) the * front pump part 25, c) the Cylinder tube 16, d) the delivery piston rod 12, e) a suction tube and f) a pressure tube.

The pipe cross piece 12 has a flange 13 with two further, laterally arranged flanges 11 and 11a. Opposite flange 13 is the stuffing box receptacle 27 for a stuffing box combination. This consists of the Abstreifringaufme 29, which holds a standard wiper ring 28 made of VITON, the piston rod guide bearing 31 made of 20 % glass fiber-filled TEFLON material for guiding the piston rod, and the actual static seal, consisting of "T-seal", a special TEFLON Granulate from National-Chemsearch GmbH, which is located between the piston rod guide bearing 31 and the stuffing box seat 29. The combination stuffing box is pressed in the usual way via the lantern 32 by means of nuts 7 and studs 6.

The front pump part 25 is a pipe T-piece with flange 21 and two side flanges 11a and 11c.

The cylinder tube 16 is clamped between the flange 13 of the pipe cross piece 12 and the flange 21 of the front pump part 25 by means of four tie rods lh . It is hard chrome-plated on the piston running surface or armored in some other way so that it is resistant to wear and corrosion.

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The piston rod 17 is also hard chrome-plated and ground. The piston is formed by the double cup cuffs 19 VITON with the pressure plate 18 and the spacer pressure plate 20.

The suction pipe (15) is composed of standard pipe bends (15a) and has two connections with standard welding flanges 10, 10a, each with an intermediate inlet valve (8, 8a) in a spring-loaded flat seat design with the paddles 11 or 11a are flanged. The connection to the material supply is also made via a standard welding flange 9. The training the pressure side corresponds to that of the suction side.

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Claims (1)

• LECHLER CHEMIE GMBH · ,, ··,. · ·, / * ,. . ·· Right to protection Double-acting piston pump, consisting of a) a commercially available seamless pipe cross piece (12.) with flange (13), two further, laterally arranged • Flanges (11, 11a) and a stuffing box holder (27) in which a wiper ring made of silicone rubber (28), a scraper ring receptacle (29) with a gland packing, preferably in the form of granules made of high-polymer tetrafluoroethylene (30), the piston rod guide bearing (31) made of glass fiber filled high polymer tetrafluoroethylene and the Stuffing box lantern (32) are arranged, and those with stud bolts (6) with nuts (7) to hold the stuffing box combination is provided b) a pipe T-piece as the front pump part (25) with flange (21) and two further, laterally arranged Flanges (lla, lic), c) a cylinder tube (16), which by means of tie rods between the head-side flanges (13, 21) of the pipe cross piece (12) and the front pump part (25) 'is excited d) a delivery piston rod (17) with two double cup sleeves ten (19) e) a suction pipe (15) with two connections with standard welding flanges (10, 10a), each with an interposed inlet valve (8, 8a) with a lateral Flange (11) of the pipe cross piece (12) or a lateral flange (lla) of the front pump part (25) are and f) a pressure pipe (26,) with two connections with standard welding flanges (10b, 10c), each with an intermediate inlet valve (8b, 8c) with a lateral Splash (lib) of the flute cross piece (12) or a lateral flange (lic) of the front pump part (25) are flanged.