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Manual 1843 Rev B p/n 001843 0000
The KT Series pumps covered by this manual
have an oil circulating pump to provide adequate
lubrication at all pressures, including atmosphere.
The vacuum pump has three cams and pistons
pumping in parallel, driven by a common shaft.
The cams are positioned on the shaft so they
dynamically balance moving parts. This balancing
technique applied to the Rotary Piston Principle,
developed by Tuthill Vacuum & Blower Systems,
virtually eliminates vibration.
Figure 4-1 – General Operation Principle
shows
a cross section of the pump with the pistons
being driven by the cams and revolving within the
cylinder.
PRINCIPLE OF OPERATION
Gas is drawn into the pump through a common
inlet, channeled to the three piston slides and
into the space behind the pistons as they rotate.
The gas ahead of the pistons is compressed and
forced out of the discharge valves. As the gas is
forced through the pump, sealing oil is mixed with
the discharged gas and the discharged mixture is
channeled into the separator, which is located in
the reservoir. There the gas is separated from the
oil. Sealing and lubricating oil is provided by the
oil pump, which is mounted on the non-drive head
and driven by direct coupling to the vacuum pump
drive shaft. The oil pump provides forced feed oil
circulation at all operating pressures, including
atmosphere.
All models have a channeled drive shaft with an
opening at each cam to distribute oil through the
pump.
Oil is taken from the reservoir at a point some
distance above the reservoir bottom. This provides
an area for impurities to collect for draining.
1.
KEY
AIR/OIL SEPARATOR
2. OIL LEVEL
3. CONNECTION FOR OPTIONAL TEMPERATURE SWITCH
4. CONNECTION FOR TEMPERATURE GAUGE
5. CONNECTION FOR “SCUM” TAKE-OFF
6. PUMP INLET
7. SLIDE PIN
8. WATER COOLING JACKET
9. (FAR SIDE) COOLING JACKET DRAIN (1 OF 2)
10. VIBRAMOUNTS
11. DISCHARGE VALVE
12. GAS BALLAST VALVE
13. OIL DRAIN
14. PISTON SLIDE
15. SHAFT
16. PISTON
17. CAM
18. CONNECTION FOR OPTIONAL HEATER
19. COOLING JACKET DRAIN (2 OF 2)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
18
19
Figure 4-1 – General Operation Principle
DESCRIPTION
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