Élément tubulaire JGQ pour air

JGQ 型管状电热元件

Élément tubulaire à gaine métallique pour chauffer l'air dans les fours, tunnels de séchage, gaines et étuves électriques. Gaine acier 10#, température maximale du fluide de 300 °C, bossage de 45 mm avec écrou M22×1,5.

Max medium temperature: 572 °F(300 °C)
Power range: 0.25 – 3 kW
Voltage: 36 / 55 / 110 / 220 / 380 V, 50 Hz
Sheath material: 10# steel, 304 stainless
Medium: Air
Mounting: Threaded boss, Bracket, Bore insert
Tube diameter: 0.63 in
Watt density guidance: ≤ 2 W/cm² (13 W/in²) recommended in still air

Lead time: 12–20 days
MOQ: 20 units
Pricing: On application

Design notes

Six géométries de cintrage, 0,25 à 3,0 kW, de 36 V à 380 V

The JGQ series is the workhorse element behind most Chinese-built drying and baking equipment. A nickel-chrome or iron-chrome-aluminum resistance coil runs down the axis of a Ø16 mm steel tube, the annulus is packed with compacted fused magnesium oxide, and both ends are swaged and sealed with silicone. The result conducts heat well, insulates electrically, and survives the vibration and thermal shock of a production line.

Six bend forms cover the usual mounting problems. JGQ1 and JGQ2 are single and double hairpins for shallow plenums. JGQ3 is a triple hairpin where more kilowatts have to fit a fixed width. JGQ4 is a long, narrow U for duct walls. JGQ5 is a deep serpentine for tall ovens. JGQ6 is a compact low-voltage form for 36, 55 and 110 V control circuits and equipment that must run at safety extra-low voltage.

Because air is a poor heat-transfer medium, watt density is the number that matters. Where an oil heater can push past 3 W/cm², an air element in still air should stay near 2 W/cm² or the sheath climbs toward its oxidation limit and the coil fails long before its rated life. Where the design brief needs more kilowatts than the duct area allows, the answer is a finned element rather than a hotter plain tube.

Features

Tube Ø16 mm, bossage de fixation 45 mm, écrou M22×1,5
Remplissage en MgO fondu compacté pour une rigidité diélectrique élevée et une conduction rapide
Terminaisons scellées au silicone, résistantes à l'humidité en stockage
Six formes de cintrage standard ; toute autre géométrie sur plan
Résistance d'isolement ≥ 1 MΩ, rigidité diélectrique 2 kV/1 min

Typical applications

Fours de cuisson et de polymérisation
Tunnels de séchage et sécheurs à convoyeur
Batteries de réchauffage en gaine CVC
Fours électriques et enceintes de traitement thermique
Lignes de cuisson de poudre

North American build options

Voltage: 120 / 208 / 240 / 277 / 480 / 600 V @ 60 Hz
Threads: NPT or BSP cut to order
Flanges: ANSI B16.5 150# / 300#
Drawings: Issued in inches on request

These are build options, not stock items — the catalog part numbers above are 50 Hz with metric fine threads. State what you need on the RFQ.

Part numbers & dimensions

24 catalog part numbers in the JGQ series

Part number	Voltage	Power	A — overall	B — heated	C — width
JGQ1-220/0.5	220 V	0.5 kW	19.3 in	13 in	—
JGQ1-220/0.75	220 V	0.75 kW	27.2 in	20.9 in	—
JGQ2-220/1.0	220 V	1 kW	19.3 in	13 in	7.87 in
JGQ2-220/1.5	220 V	1.5 kW	27.2 in	20.9 in	15.7 in
JGQ3-380/2.0	380 V	2 kW	23.2 in	16.9 in	11.8 in
JGQ3-380/2.5	380 V	2.5 kW	27.2 in	20.9 in	15.7 in
JGQ3-380/3.0	380 V	3 kW	31.1 in	24.8 in	19.7 in
JGQ4-220/0.8	220 V	0.8 kW	31.5 in	5.04 in	2.09 in
JGQ4-220/1.0	220 V	1 kW	39.4 in	5.04 in	2.09 in
JGQ4-220/1.2	220 V	1.2 kW	47.2 in	5.04 in	2.09 in
JGQ4-220/1.4	220 V	1.4 kW	55.1 in	5.04 in	2.09 in
JGQ5-220/0.7	220 V	0.7 kW	33.9 in	26 in	3.94 in
JGQ5-220/0.8	220 V	0.8 kW	49.6 in	33.9 in	7.87 in
JGQ5-220/0.9	220 V	0.9 kW	61.4 in	37.8 in	11.8 in
JGQ5-220/1.1	220 V	1.1 kW	73.2 in	45.7 in	13.8 in
JGQ5-220/1.2	220 V	1.2 kW	81.1 in	49.6 in	15.7 in
JGQ5-220/1.3	220 V	1.3 kW	89 in	49.6 in	19.7 in
JGQ5-220/1.5	220 V	1.5 kW	101 in	61.4 in	19.7 in
JGQ6-36/0.25	36 V	0.25 kW	10.2 in	4.72 in	2.76 in
JGQ6-55/0.25	55 V	0.25 kW	10.2 in	4.72 in	2.76 in
JGQ6-55/0.3	55 V	0.3 kW	13.4 in	7.87 in	2.76 in
JGQ6-110/0.4	110 V	0.4 kW	15.4 in	9.84 in	2.76 in
JGQ6-110/0.5	110 V	0.5 kW	17.3 in	11.8 in	2.76 in
JGQ6-220/0.6	220 V	0.6 kW	26 in	19.7 in	2.76 in

A/B/C are nominal catalog dimensions. The controlling dimensions on any order are those on the drawing approved before production.

Minimum order quantity for this series is 20 units. Dimensions switch between millimetres and inches with the unit toggle in the header.

Full specification

Sheath material: 10# steel (304 stainless on request)
Tube diameter: Ø16 mm
Max. medium temperature: 300 °C
Voltage range: 36 / 55 / 110 / 220 / 380 V, 50 Hz
Power range: 0.25 – 3.0 kW
Fastening boss length: 45 mm
Fastening nut: M22 × 1.5
Insulation resistance: ≥ 1 MΩ at 500 V DC
Dielectric strength: 2 kV, 1 minute
Permitted supply tolerance: ≤ 1.1 × rated voltage
Ambient humidity: ≤ 95 % RH, non-explosive, non-corrosive
Design life: 10,000 h typical

Questions engineers ask

What watt density should I use for an air-heating element?

Stay near 2 W/cm² in still air and you can go higher — up to about 3.5 W/cm² — where forced convection sweeps the element continuously. Exceeding that in still air raises sheath temperature past the point where the resistance coil oxidizes, and the element fails well short of its 10,000-hour design life. If the kilowatts will not fit at a safe density, add surface area with a finned element rather than pushing the plain tube harder.

Can a JGQ element be run vertically?

Yes, and for air heating there is no restriction. The rule that matters more is that the whole heated length stays inside the air stream: any part of the heated zone sitting outside the duct, in still or dead air, will run far hotter than the rest and become the failure point. Keep the unheated cold ends outside the duct wall and the heated length entirely inside it.

Why does the catalog quote a 300 °C maximum when the sheath can go hotter?

300 °C is the maximum medium temperature — the temperature of the air around the element — not the sheath temperature. The sheath always runs hotter than the medium. Rating on medium temperature is what lets you size directly from your process set-point without back-calculating sheath rise.

Do you supply non-catalog lengths and bend forms?

Yes. The six catalog forms cover common oven and duct layouts, but roughly half of what leaves the plant is made to a customer drawing. Send a dimensioned sketch with the kilowatts, voltage, medium and mounting detail and we will quote the formed element against it.

Watt-density figures and temperature limits on this page are design guidance, not warranties. The safe value for your installation depends on the medium, its flow and how the element is mounted — which is why we ask for the duty rather than only the part number.

Commonly specified with