How to check compressor capacity kt 6
Compressor KT6 three-cylinder, vertical, two-stage, intercooled, belongs to the group of W-shaped compressors These compressors are used on diesel locomotives of TEP, TEP7, TEP60 series, shunting locomotives TEM1 and TEM2. Modification of compressor KT6 is compressor KT7 with reversed direction of rotation of the crankshaft and used on diesel locomotives TE10, TEP10, 2TE10 series. Compressor device. Main compressor components (see fig.1) are cast iron cast housing 13, two cylinders 4 low pressure (t.н.д.), one cylinder 12 high pressure (t.в.д.), cooler 9 of radiator type with safety valve 10, fan 3 with drive and cover, oil pump. Casing 13 has three rearend flanges with rectangular windows for mounting the cylinders with six studs and two locking dowel pins. One flange window serves for mounting and dismounting of connecting rod assembly 2. On the sides of the housing 13 there are two hatches for access to the parts located inside the housing. Axes of all cylinders are in one vertical plane. Low-pressure cylinders with a diameter of 198 mm, located at an angle of 120 °, and high-pressure cylinders with a diameter of 155 mm. vertically between the two ts. н. д. The front of the housing is closed with a removable cover, which houses one of the crankshaft bearings 1.
The shaft journal is sealed by a leather expander gland in a metal cage. At the bottom of the housing is a mesh oil filter 14, reinforced by a threaded fitting. For better heat dissipation, the cylinders have ribs that are at the bottom of the cylinder.н.д. are arranged along the axis to give more rigidity. all cylinders are closed by covers with valve boxes 7 and 8. To the ts.н.д. on the side of the suction cavity an air suction filter 6 with a collector 5 is attached and on the side of the discharge cavity a cooler 9. The cooler consists of a manifold and radiator sections, made of cylindrical tubes, finned by. Each section is connected to the corresponding cylinders by means of nozzles. For better air cooling in the cooler a fan 3. To prevent an arbitrary pressure rise in case of malfunctions, there is a safety valve 10 in the refrigerator chamber, set for 4.5 kG/cm2 pressure. The safety valves on the main cylinders should be set to 10.7 kG/cm2. The pistons, fitted with two sealing rings and two cast-iron oil rings, are connected to connecting rods 3 and 5 (Fig.2) by means of pins. On the other side the connecting rods are connected to the head 1, mounted on the crank pin of the crankshaft 10. The head with the pins forms a rod assembly. Connecting rod 3 with head 1 is rigidly connected and two trailing connecting rods 5. movably.
The inner cavity of the valve box is divided into two chambers: the suction B, which is located suction valve 15 with pressure relief device and the discharge H, which is located discharge valve 2. Discharging valve 2 is pressed against the box body by screw 4 through a stopper. Discharging device mechanism consists of a stop 11 with three fingers 16, a cover, a diaphragm 6 and a rod with a disc 9. The stop guide is a sleeve pressed into the cap.
The unloader mechanism works as follows. If the air pressure in the main reservoirs exceeds the pressure regulator setting, the air flows from the pressure regulator from above to the diaphragms of the suction valves. Under the action of air pressure on the diaphragm, the suction valves are squeezed and the compressor begins to run at no load. The pressure of the air in the main vessels falls below the minimum pressure adjusted by the regulator, the cavity above the diaphragm contacts the atmosphere. Under the action of the stop return spring, the stop will move upward, the suction valves will cease to close and the compressor will once again operate under load. The lubricant is supplied to the rubbing surfaces of the compressor components by the oil pump (Fig.4) with relief valve 9, which regulates oil supply depending on crankshaft rotation speed.
The pump, mounted in the crankcase on pins, can move. There is a plunger in the pump casing with a collar that is mounted on the eccentric shaft of the compressor. There is a ball valve inside the plunger. In the compressor crankcase is a filter with a check valve (breather), which releases air when the pressure in the crankcase increases in case the piston rings miss air. The oil pump consists of a flange 3, which through the gasket is attached to the compressor crankcase, body 2, cover 1 and drive roller 4. The square end of the roller is meshed with a sleeve that is inserted into the crankshaft. Spherical part of the shaft shank serves as a hinge and at the same time seals the shaft in the sleeve of the crankshaft. Roller 4 has a disk 6 with diameter 48 mm in which grooves contain two blades pressed by a spring to eccentric groove with diameter 52 mm in the housing. When rotating the crankshaft and therefore the drive roller clockwise (if viewed from the square side of the roller), each blade creates a vacuum in the cavity shown in red. As a consequence, oil from the compressor crankcase filter is sucked through the inlet tube (“oil inlet”) into this (red) cavity and pressed into the green cavity. From there, oil flows through a channel via a fitting to the pressure gauge, and through an opening in the drive shaft to the crankshaft lube ports (“oil outlet”) and bearings. Oil supply to the manometer, coming from the pump in order to eliminate oscillation of the manometer pointer is made in the form of nipple, which has a calibrated 0.5 mm hole and is equipped with a 0.25 l reservoir.
The principle of operation of the compressor is shown in the figure. low-pressure cylinders are located so that while in the left cylinder air is sucked in, in the right one it is forced out to the cooler, and vice versa. Air from the refrigerator is sucked into the high-pressure cylinder, where it is further compressed.
Animation (animation) on the schemes of direct acting, indirect acting brake and EPT
Excellent reference of the new air distributor for passenger cars 42. With animation and narration
Parameters and characteristics of compressors KT-6, KT-7, KT-6 El.
Power consumption at a final pressure of 0.9 MPa (9 kgf/cm)
Throughput at counter pressure (0,9 MPa 9 kgf/cm2)
Repeatedly short cycle up to 10 min
Continuous compressor operation is allowed at pressure rise
from 0,098 to 0,98 MPa (1 to 10 kgf/cm2), not more
Directly from combustion engine or any type of electric motor
corresponding capacity and corresponding speed of rotation through elastic or semi-rigid couplings.
Sound pressure level in octave frequency bands
Maximum permissible ambient temp. at distance of 3 m from compressor circuit, dB
To ensure reliable operation of the compressors, it is necessary to use special oils, whose grades are listed below:
Note. For operation of compressors in northern regions at ambient temperatures from.20°C up to.55 °С
THE USE OF ANY OTHER LUBRICANT WITHOUT FACTORY APPROVAL COULD RESULT IN COMPRESSOR FAILURE.
2000 Compressor is shipped from the factory without lubricating oil in the shell. The required lubricant volume must be specified when ordering the compressor.
To ensure uninterrupted compressor operation, it is imperative that the manufacturer’s recommendations and practices for changing and checking oil levels in this manual are adhered to.
Checking the compressor and pressure regulator when accepting the locomotive
Oil level should be between the oil level gauge lines.
Visually inspect compressor fasteners and look for signs of oil leakage.
Inspect condition of fan belt and fan blades;
Check the seals on the safety valves and pressure regulator.
After starting compressor in operation make sure there is no extraneous knocking.
Make sure oil pump does not undergo oil pressure less than 1,5 kgf/cm2 at 440 rpm on compressor crankshaft (KT-6El compressor). Diesel engines compressors KT-6, KT-7 must be provided with pressure not less than 1.5 kgf/cm2 at idle running (400 rpm), at rated speed (850 rpm) not less than 2.0 kgf/cm2. Maximum pressure not exceeding 6.0 kgf/cm2. For the VU 3.5/10 compressor of EP-1M electric locomotive, the oil pressure shall be not less than 0.8 kgf/cm2 (controlled by pressure sensors SP15, SP16).
Check that the pressure difference between compressor on/off is 7.5 to 9.0 kgf/cm2. or 7.5 to 8.5 kgf/cm2 for specific locomotive series. Admissible deviations ± 0,2 kgf/cm 2. If compressor operating limits are 7.5 8.5 kgf/cm2. difference of pressure between compressor on/off should be not less than 1 kgf/cm2.
Check compressor capacity by time of pressure increase in GR from 7.0 to 8.0 kgf/cm2. Time is indicated at operation of one compressor (on electric locomotives at nominal voltage in the contact network, on diesel locomotives at zero position of the controller).
Запись Вебинара занятия Компрессор КТ-6 и ВУ 3,5/10.
|Locomotive series||Compressor type||Volume of GR, l||Filling time of GR, s|
|PM4 T||К2||980 1080|
|VL80 (all indexes)||KT6 el|
Oil level should be between the oil level indicator.
Visually check compressor fastening and traces of oil leakage.
Check condition of fan belt and fan blades;
Check availability of seals on safety valves and pressure regulator.
After starting compressor in operation make sure that there is no extraneous knocking.
Make sure that oil pump can supply oil at pressure no less than 1.5 kgf/cm2 at 440 rpm of compressor crankshaft (KT-6El compressor). Diesel compressors KT-6, KT-7 must be provided with pressure of at least 1.5 kgf/cm 2 when idle (400 rpm), at nominal mode (850 rpm) not less than 2.0 kgf/cm 2. Maximum pressure not more than 6.0 kgf/cm2. For AC-3,5/10 compressor of EP-1M locomotive oil pressure shall be not less than 0.8 kgf/cm2 (controlled by pressure gauges SP15, SP16).
Make sure that pressure limits between compressor on/off are 7,5 9,0 kgf/cm2 or for some series of locomotives 7,5 8,5 kgf/cm2. Permissible deviations ± 0.2 kgf/cm2. If the compressor limits are 7.5 8.5 kgf/cm 2. The pressure difference between compressor on and off must be at least 1 kgf/cm2.
Check compressor performance on time of pressure increase in GR from 7.0 to 8.0 kgf/cm2. time is indicated at work of one compressor (on electric locomotives at nominal voltage in the contact network, on diesel locomotives at work of the diesel engine at zero position of the controller).
Performance of compressor kt 6
Students, graduate students, young scientists who use the knowledge base in their studies and work will be very grateful to you. Electric locomotive. A locomotive powered by traction motors on the locomotive, which receive their electric power from a stationary source. power systems through traction substations and traction network from overhead contact wire or from own traction batteries. Also combined contact battery electric locomotives are produced which may be operated both from contact mains and accumulator batteries. The vast majority of mainline electric locomotives in service have a maximum permissible load of 1,500 kg/cu.m. of oil. On the tracks of industrial enterprises, autonomous electric locomotives that do not depend on the contact network are often used.
Compressor performance check
Combi-crane overlapped, in second position. We wait for the moment of inclusion of CT-6 and note the time of pumping pressure in GR from 7 to 8 atm. Time of filling by one compressor must be not more than: on VL80. 45 sec. VEP is designed to convert single-phase alternating current with frequency 50 Hz to direct pulsating current, to regulate smoothly the voltage at TED in traction mode, as well as to convert direct current generated by TED to single-phase alternating current with frequency 50 Hz and to regulate smoothly the inverter counter EMF in PT mode.
Standard delivery set:. Additional equipment:.
These compressors are designed to operate in the ambient conditions listed below:. Compressor KT7 differs from KT6 in the direction of rotation of the crankshaft. Parameter Name. Norm for compressor. Compressor type.
Compressor brake KT6, KT7 and KT6El are designed to produce compressed air necessary for feeding brake and other pneumatic systems and devices of locomotive and train. Name is compulsory. E-Mail will not be published necessarily. Function of technical device. Technical parameters.
Watch video : Electric locomotive compressor explosion.Thumb on the floor.Watch out for the mat.Ridiculous laugh of a locomotive driver.
Username Password Forgot Password? Forgot username login? Compressor performance is checked by the time of compressed air pressure increase in the main reservoirs when the pressure relief valve is closed. Locomotive auxiliary brake valve knob must be in release position. If there is compressed air in the main reservoirs, it is vented through the outlet cocks until the compressor is turned on by the pressure regulator. Search Site. Frame and body of the car Technology of manufacturing parts from rolled steel Technology of tank boiler manufacturing Features of manufacturing from alumina. Automatic coupling device Manufacturing of coupling parts Repair of the body of the automatic coupling Repair of the absorbing apparatus Absorbing apparatus Shock absorbing devices.
Construction, maintenance and current repairs of diesel locomotive compressor type KT-6
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Performance of kt 6
Brake pneumatic systems, railroad vehicles and other heavy industrial units operating on compressed air need powerful compressor equipment. The optimal device to get compressed air is a kt 6 compressor the price of which is not expensive and makes it profitable to buy in all situations. The key distinguishing feature of the KT-6 from other models is that its fan, crankshaft, and other mechanical components turn clockwise. This unit has no crush valve compartments, but is equipped with electric oil heating. This greatly extends its range of application and maximizes performance.
Design and operation of compressor KT-6. Checking compressor performance on the locomotive.
Compressors KT-6 are widely used on diesel and electric locomotives. The compressor is driven by the diesel crankshaft. Compressors KT-6El are driven by an electric motor. KT-6 compressor is a two-stage, three-cylinder, piston with a W-shaped cylinder arrangement. Compressor KT-6 consists of:
The rotation of the crankshaft through the connecting rod assembly produces a reciprocating movement of two low-pressure pistons and one high-pressure piston in the cylinders. During reverse stroke of the pistons, air from the atmosphere enters into the space above the piston through suction filters, collector and valve boxes, and during forward stroke it is compressed to a pressure of 0.4 MPa and fed into the cooler for cooling. The latter consists of a series of tubes with a brass spiral wound around them to increase the cooling surface. This is also assisted by the fan. The oil pump pressure gauge and relief valve are mounted on the cooler to protect against excessive pressure if the valve boxes are not adjusted.
Process of air compression from refrigerator by the second compressor stage to GR pressure takes place in the same way as described. In the lower part of the compressor casing, there is a sump with oil and oil filter. Lubrication of friction parts is combined: by splashing and from an oil pump
The air pressure after the first compression stage usually makes 0,2-0,4 MPa, and it goes to the refrigerator for intermediate cooling. The second compression stage of compressors ensures pressure increase up to final 0,75-0,9 MPa, necessary for GR of locomotives due to operating conditions of automatic brakes.
Compressor capacity is checked by time of filling the main reservoirs on electric locomotives. switch on at 7.5 0.2, switch off at 9 0.2 kgf/cm2; on diesel locomotives. switch on at 7.5 0.2, switch off at 8.5 0.2 kgf/cm2
Lubricants. Concept of friction, coefficient of friction.
The right choice and timely application of lubricants have a significant influence on reliable operation of locomotives and traction units, preventing intensive wear and heating of interacting surfaces as well as protecting the surfaces against corrosion. Liquid greases and solid lubricants are used for maintenance of locomotives.
Mineral oils are used as liquid lubricants: diesel oil, aviation oil, industrial oil, compressor oil, axle oil, etc.
Greases are plastic lubricants produced by thickening mineral oils with soaps and other thickening agents. The following multipurpose greases are used: low-melting UL (technical Vaseline), medium-melting US (solidols), refractory LPH (heavy-duty grease).
Solid lubricants. Dry graphite grease SGS-0 is applied to the current collector rail in hot state at 180°С.
Friction (frictional interaction) is a process of bodies interaction during their relative motion (displacement) or during movement of a body in a gaseous or liquid medium.
Friction coefficient is a quantitative characteristic of the force required to slide or move one material across the surface of another
Electric locomotive cabin mechanism. Locomotive ventilation system.
The following equipment is normally located in the driver’s cab:
On the operator’s console there are pushbuttons, indicator lamps and gauges:
Pressure gauges: main tank, balance tank, brake line, brake cylinders.
On the console of the assistant driver there are push-buttons, voltmeter of voltage on the battery and in the control circuits, pressure gauge of compressed air in the circuits of electrical apparatus.
Forced ventilation is used on electric locomotives to ensure normal operating conditions for traction motors, compressor motors, starting resistors, field attenuation resistors, inductive shunts, rectifiers, transformer heat exchangers, smoothing reactors, braking resistor units and other equipment, to ensure the required overpressure in the body with
to prevent penetration of dust and snow during movement of the locomotive, and to cool the body room in summer. air is sucked by fans, driven by electric motors, through air intake devices, consisting of special cameras with louvers and filters. air flows, having passed through air intake devices, are cleared of moisture, snow and dust and directed to the air ducts for cooling of electric equipment.
Date of addition: 2019-01-14 ; views: 5743 ; We will help in writing your paper!
Design of compressors KT-6, KT-7, KT-6El
The pin is located in the housing on the oil pump side.
All three cylinders have fins: the CDP is made with horizontal
Crankshaft and cylinder head are ribbed for better heat dissipation and LCA have vertical ribs for optimum heat transfer from the cylinder to the nozzle
to give the cylinders more rigidity. The cylinders have two crank pins and one crank pin to give the cylinders greater rigidity and stiffness-
Compressor crankshaft 19 is stamped steel, with two front and two rear crankshafts
the spike has two main journals and one crank journals. To reduce the-
To prevent the amplitude of natural vibrations to the counterweights with screws attached 23-
additional balancers 22. For oil supply to the crankpins, the crankshaft has a pressure gauge at the bottom of the crank shaft-
The crankshaft has the system of ducts shown in Fig. 3.2
Connecting rod assembly consists of main 1 and two trailing 5 connecting rods-
pins 14 interlocked with screws 13.
main connecting rod; 2, 14. pins; 3, 10. pins; 4. head; 5. at-
connecting rods; 6. removable cover; 7. gasket; 8. bronze bushing; 7. bearings; 8. bearings-
connecting rods; 9. ducts for grease supply; 11, 12. bearings; 13. locking pin; 10. pins
3.3.After repair and assembly the compressor shall be subjected to: a) cranking without valve boxes, cooler and fan; b) test on heating; c) test at counter-pressure of 10 kgf/kv.Crankshaft has a crankcase with a system of raceways, shown in Figure 6; d) capacity test; e) density test; f) crankcase oil gallery. Table 1. Running-in modes of compressors Cranking frequency, rpm Running-in duration, min Note 270-300 30 The compressor must work non-stop on these modes 400-440 30 750-850 30 For the heating test, the compressor with valve casings, cooler, fan and air filters should be assembled. The compressors are tested at 270° C, with a maximum oil temperature of 65°C. 320 rpm and 750. at 850 rpm on the crankshaft. At 270-320 rpm compressor is tested for 2 h under the following conditions:. without backpressure 20 min;. With pressure reducer on 40 min;. with a back pressure of 9.0 kgf/sq.cm 60 min. At the end of the test, measure crankcase oil and compressor charge air temperature. Oil temperature not to exceed 65 deg.C (at least 1.5 kgf/sq.ft. of oil pressure on the pressure reducer);. 40 min.cm), and the injected air at a distance of no more than 500 mm from the valve housing between 150 and 180 deg C.С. Following this, compressor crankshaft speed is increased to 750-850 rpm and the test is then run for 1 hour, at which point the compressor is subjected to a temperature test. At the end of the test the temperature of the oil and charge air shall be measured. The oil temperature should be no higher than 85 degrees Fahrenheit.C (with an oil pressure of at least 3.0 kgf/sq.cm), and the discharge air not more than 500 mm from the valve housing not more than 180 deg C.С. The KT6El compressor is tested at 270 rpm and 420 rpm at a backpressure of 9 kgf/square kilograms per second.cm for 2 h. The oil temperature in the crankcase should be no higher than 85 deg C.C, and the pressurized air at a distance of no more than 500 mm from the valve housing at no more than 1800 C (with oil pressure of at least 1,8 kgf/sq.m.).see). Heating test temperatures are given at 30 deg C ambient temp.To check short-term overload capacity, the compressor is tested at a backpressure of 10 kgf/square kV (1,000 lbf/ft2) to verify that it will operate satisfactorily at all times;. The test is performed at a differential pressure of 180°C.cm for 5 min at 270 rpm and 5 min at 740-850 rpm. The test is performed on a warmed up compressor. After the compressor has stopped and cooled down, the compressor is inspected. Detected defects are eliminated; If the results of previous tests are positive, check the capacity of the compressors, which must be at least 2.75 cc.m/min at 440 rpm crankshaft speed; 4.6 cu.m/min at 750 rpm; 5.3 cu.m/min at 850 rpm; It is necessary to check tightness of valves and rings in the compressor. Pressure drop rate in a 335 L tank of 8.0 kgf/sq.cm must not exceed 1.0 kgf/sq.cm per 10 min.