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Blades of rotary compressors

The blades (plate) are mounted in slots of the rotor (4-10 pcs) of VR-8, KO series, and other pumps present on the market.

Oxafen OPM-94 is a modern material manufactured using a more advanced process compared to fabric-reinforced epoxy laminate.

Our company manufactures blades which are price-competitive with regular blades made of PTG grade fabric reinforced epoxy laminate. Oxafen OPM-94 reduces blade replacement, increases service life of pump housing 2-3 fold, and reduces its heating.

According to testimony of our clients, the pump can be operated every day at full capacity without having to open it for at least 1 year.
Oxafen OPM-94 blades are used in various dry and oil-filled rotary compressors in agriculture, utility sector, printing industry, cement production, and other industries. Oxafen OPM-94 rotary pump blades are made as a plate with rounded, flat, or other sliding surface.

Case study: Oxafen plates with enhanced anti-friction properties and wear resistance intended for rotary vacuum pumps of milking machines
Executive summary
According to the results of energy assessment of UVD-10 rotary vacuum pump with plates made of Oxafen composite material, the specific energy intensity decreased by 12% compared to commercial PTG plates.
  1. The object and purpose of the study
Our company has conducted wear-resistance tests of plates made of Oxafen antifriction composite material on UVD-10 rotary vacuum pump. The purpose was to determine the energy characteristics in comparison with PTK textolite plates. The test plates are made of composite materials using polymer fibers and do not require impregnation with oil.

2. Methodology

Samples' wear resistance was evaluated in accordance with ASTMG99 standard, which provides for determination of materials wear during their relative movement (sliding) in a pin-disk arrangement under non-abrasive wear conditions.

For the pin-disk test, two interacting samples were used. The first one, a pin with a rounded end (counter-sample), was placed perpendicular to the second sample, a flat rectangular plate. A ball is rigidly fixed at the pin end to provide the necessary radius of pin end rounding.

The test machine rotated the sample around its center. The sliding trajectory was a circle on the surface of the sample. Disk flat surface was horizontal. During the test, the coefficient of friction and the depth of penetration of the counter sample into the sample body were continuously measured.

The pin was pressed against the plate surface with a certain force created by a system of loads.

Sample wear was measured as the loss of material volume in mm3, the wear of the counter sample was evaluated qualitatively according to the size of the contact mark.

The amount of wear was determined using profilography method, by measuring the wear surface cross sectional area and integrating along the sliding path. This method was used with a view to the fact that changes in sample mass were difficult to measure due to their small amount.

The following equipment was used in the tests: TRB-S-DE-0000 tribometer by CSM Instruments, Surtronic 25 ml 12/3522-01 profilograph-profilometer, instrument for measuring metals and alloys hardness according to Rockwell method, model TK-14-250 GOST 23677-79, Olympus GX51 inverted metallographic microscope.

The tests were carried out with a load of 20 N, the relative sliding velocity of 0.30 m/s, at a distance of 4,500 m, humidity of 45-50% and ambient air temperature of 23-25°C.

Test run

Immediately before the test and measurement, the sample and the counter sample were cleaned by wiping with a cloth moistened in acetone and dried in air. In accordance with GOST 23.224-86 standard recommendations, the marks were made on the test sample using Rockwell hardness tester so that a sliding path was located between the marks.

The samples were profilographed in such a way that the lowest points of the marks were located on the profilography path.

The sample surface in the marks area was photographed at 50-fold magnification using a microscope, and the distance between the marks was measured.

The sample and counter sample were reliably fixed in the holders, adjusted in such a way that they were located perpendicularly during the test to ensure the necessary contact conditions.

The loads were set to provide the selected force at the sample-counter sample contact.

Conclusions:
  • According to the results of tribotechnical tests performed subject to ASTM G99 and GOST 23.224-86 standards, the wear of plates made of composite with polymer fibers is 1.65 times less compared to commercial PTG plates.

  • An increase in the width of the wear trajectory corresponds to the increase in the wear trajectory cross section area, which confirms the correctness of the performed cross section area measurements, since these measurements were carried out independently.

  • In wear resistance ascending order, the samples are arranged as follows: Graphite, PTG, Oxafen. At the same time, the wear amount of the Graphite sample exceeded the corresponding parameter of PTG and Oxafen samples, respectively, by 3.7 and 6.1 times.

  • The wear resistance of the counter sample increased when used, respectively, with: PTG, Graphite, and Oxafen sample.

The best wear resistance of both the sample and the counter sample was observed in Oxafen sample tests.

The energy indices (specific energy consumption in kWh/m3) were measured in FGBNU FNATs VIM laboratory (on one pump) and at Chelno-Vershinsky Machine-Building Plant in Samara region.

The total operating time of each pump with test plates by Oxafen Tech was 100 hours in case of FGBNU FNATs VIM, and 220 hours for each of 3 pumps at Chelno-Vershinsky Machine-Building Plant.

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