Oil-free Scroll Air Compressor

ULPPRO is an industrial equipment manufacturer and supplier for Oil-free Scroll Air Compressor, we dedicated to the research and development, manufacturing, and long-term operational value management of compressed air systems.

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Product Description

Scroll Air Compressor Working Principle

The main components of a scroll compressor are two involute scroll wraps that are identical in shape but positioned 180° out of phase with each other. One is the fixed scroll, and the other is the orbiting scroll, which is driven by an eccentric shaft and revolves around the axis of the fixed scroll without rotating on its own axis. During operation, the two scrolls come into contact at multiple points, forming sealing lines. Together with proper sealing at the end faces of the two scrolls, several crescent‑shaped gas pockets are created. As the orbiting scroll revolves, the point of contact between the two scrolls moves continuously along the scroll curve, causing the size and shape of these crescent‑shaped pockets to change constantly. The compressor’s suction port is located at the upper part of the fixed scroll housing. When the eccentric shaft rotates clockwise, gas enters the suction chamber through the suction port and is then drawn into the outer crescent‑shaped pockets that are connected to the suction chamber. As these outer pockets close off from the suction chamber, their sealed volumes gradually move toward the center of the fixed scroll while continuously shrinking, thereby compressing the gas and raising its pressure.

Compression mechanism

The orbiting scroll rotates in the sequence shown in the figure: No.1 → No.2 → No.3 → No.4. As it moves, the volume of the crescent‑shaped compression chambers located at the corresponding positions gradually decreases. After the gas is compressed, it is discharged from the central discharge port.

Oil‑free scroll compressor unit

Fixed scroll

Orbiting scroll

Advantage and feature

1. High reliability

1）The scroll compressor has fewer main components – only 1/8 of the number found in a piston compressor. This significant reduction in parts is a key factor in improving reliability.

2）The small radius of gyration results in less wear, higher mechanical efficiency, and lower vibration.

3）A scientifically controlled whole-unit system further ensures improved stability.

2. Lowest noise

1）The absence of intake/exhaust valves and complex moving mechanisms eliminates valve plate knocking and gas burst noise, drastically reducing overall noise levels.

2）The continuous and stable intake/discharge process results in extremely small airflow pulsation.

3）A 15 HP (11 kW) scroll air compressor produces a noise level of only 62 dBA, allowing it to be installed almost anywhere, saving significant installation costs while also meeting environmental requirements.

3. Lowest energy consumption

1）Due to the intake supercharging effect and the absence of clearance volume, the volumetric efficiency of a scroll air compressor can reach over 98%.

2）Because the compression process takes place gradually in several working chambers, the pressure difference between adjacent chambers is very small, resulting in extremely low leakage. The multi‑stage compression process also ensures high thermal efficiency.

3）The absence of intake/exhaust valves means that resistance losses at the intake and discharge are virtually zero. With no frictional wear from moving mechanisms, the mechanical efficiency is high. This is the main reason why scroll compressors achieve significantly greater energy savings compared to other types of air compressors.

4. Lowest maintenance cost

Fewer components in the compressor unit, especially fewer wearing parts, significantly reduce the possibility of part replacement. In addition, the long replacement interval for consumable parts makes the unit easy to use with minimal maintenance workload and low maintenance cost.

5. 100% oil‑free compressed air

Only an oil‑free air compressor can generate oil‑free compressed air. Whether production takes place in the pharmaceutical, food, precision electronics, or similar industries, avoiding risks is essential. This is why oil‑free compressed air solutions are needed – for applications requiring high‑purity compressed air. No oil means no risk: no risk of contamination, no risk of damaging products or making them unsafe, and no risk of production stoppages. In short, no oil means no risk to your hard‑earned reputation.

Energy‑saving, low consumption, easy operation.

Technical parameters for Oil-free Scroll Air Compressor

Model	Power		Rated pressure		Free Air Delivery			Dimension			Host machine	Weight		Air outlet	Note
	Power		Rated pressure		Free Air Delivery			L	W	H	Host machine	Weight		Air outlet
	kW	hp	bar	psig	l/s	m³/min	cfm	mm	mm	mm	pcs	kg	ib	inch/mm
ULPW-04 SAM	3.7	5	8-10	116-145	7	0.4	14	730	610	880	1*04	200	441	G3/4	Box-type
ULPW-04 JAM	3.7	5	8-10	116-145	7	0.4	14	1300	840	1480	1*04	300	661	G1	External integrated 200L
ULPW-04 JAM	3.7	5	8-10	116-145	7	0.4	14	1400	900	1480	1*04	350	772	G3/4	Built-in integrated 80L
ULPW-06 SAM	5.5	7.4	8-10	116-145	10	0.6	21	730	610	880	1*06	210	463	G3/4	Box-type
ULPW-06 JAM	5.5	7.4	8-10	116-145	10	0.6	21	1300	840	1480	1*06	310	683	G1	External integrated 200L
ULPW-06 JAM	5.5	7.4	8-10	116-145	10	0.6	21	1400	900	1480	1*06	360	794	G3/4	Built-in integrated 80L
ULPW-08 SAM	7.5	10.1	8-10	116-145	13	0.8	28	1170	700	1080	2*04	380	838	G1	Box-type
ULPW-08 JAM	7.5	10.1	8-10	116-145	13	0.8	28	1755	840	1640	2*04	480	1058	G1	External integrated 200L
ULPW-08 JAM	7.5	10.1	8-10	116-145	13	0.8	28	1810	820	1750	2*04	500	1102	G1	Built-in integrated 200L
ULPW-12 SAM	11	14.8	8-10	116-145	20	1.2	42	1170	700	1080	2*06	400	882	G1	Box-type
ULPW-12 JAM	11	14.8	8-10	116-145	20	1.2	42	1755	840	1640	2*06	500	1102	G1	External integrated 200L
ULPW-12 JAM	11	14.8	8-10	116-145	20	1.2	42	1810	820	1750	2*06	550	1213	G1	Built-in integrated 200L
ULPW-18 SAM	16	21.5	8-10	116-145	30	1.8	64	1170	700	1550	3*06	600	1323	G1	Box-type
ULPW-24 SAM	22	29.5	8-10	116-145	40	2.4	85	1550	1170	1075	4*06	800	1764	G1½	Box-type
ULPW-30 SAM	27	36.2	8-10	116-145	50	3	106	1550	1170	1550	5*06	1080	2381	G1½	Box-type
ULPW-36 SAM	33	44.3	8-10	116-145	60	3.6	127	1550	1170	1550	6*06	1200	2646	G1½	Box-type
ULPW-42 SAM	38	51	8-10	116-145	70	4.2	148	2320	1450	1700	7*06	1400	3086	G2	Box-type
ULPW-48 SAM	44	59	8-10	116-145	80	4.8	169	2320	1450	1700	8*06	1500	3307	G2	Box-type
ULPW-54 SAM	49	65.7	8-10	116-145	90	5.4	191	2320	1450	1700	9*06	1650	3638	G2	Box-type
ULPW-12SAM-V	3	4	8-10	116-145	20	1.2	42	1170	700	1080	1*1.2	350	772	G1	Vortex Permanent Magnet