Product Details

DJ-22 Bolt Electric Heater

No.	Electric Heater Model	Heated Bolt Diameter Ø1	Protective Tube Length L	Heating Length I1	Cold End Length I2	Power W
1	DJ22-1	M56×4	255	100	125	550
2	DJ22-2		280	126		700
3	DJ22-3		305	150		850
4	DJ22-4		330	175		950
5	DJ22-5		355	200		1100
6	DJ22-6		405	250		1400
7	DJ22-7	M76×4	315	125	160	900
8	DJ22-8		340	150		1050
9	DJ22-9		365	175		1200
10	DJ22-10		390	200		1350
11	DJ22-11		440	250		1650
12	DJ22-12		490	300		2050
13	DJ22-13		540	350		2350
14	DJ22-14		590	400		2700
15	DJ22-15		640	450		3050
16	DJ22-16		690	500		3350
17	DJ22-17		388	150	208	1150
18	DJ22-18		413	175		1350
19	DJ22-19		438	200		1550
20	DJ22-20		488	250		1900
21	DJ22-21		538	300		2300
22	DJ22-22		588	350		2650
23	DJ22-23		638	400		3050
24	DJ22-24		688	450		3400
25	DJ22-25	M100×4	738	500		3800
26	DJ22-26		788	550		4200
27	DJ22-27		838	600		4500
28	DJ22-28		888	650		4700
29	DJ22-29		938	700		4900
30	DJ22-30		988	750		5100
31	DJ22-31		1038	800		5300
32	DJ22-32		1088	850		5500
33	DJ22-33		1138	900		5700
34	DJ22-34		1188	950		5900
35	DJ22-35		1238	1000		6100
36	DJ22-36		1288	1050		6300
37	DJ22-37	M120×4	480	200	250	1650
38	DJ22-38		530	250		2050
39	DJ22-39		580	300		2450
40	DJ22-40		630	350		2900
41	DJ22-41		680	400		3300
42	DJ22-42		730	450		3700
43	DJ22-43		780	500		4100
44	DJ22-44		830	550		4500
45	DJ22-45		880	600		4600
46	DJ22-46		930	650		4800
47	DJ22-47		980	700		5000
48	DJ22-48		1030	750		5200
49	DJ22-49		1080	800		5400
50	DJ22-50		1130	850		5600
51	DJ22-51		1180	900		5800
52	DJ22-52		1230	950		6000
53	DJ22-53		1280	1000		6200
54	DJ22-54		1330	1050		6400

 

Bolt Heater Technical Requirements:
(I) The turbine bolt electric heater shall meet the following requirements: 1. The raw materials used for the electric heater shall meet the following requirements: ① The composition of the insulating material magnesium oxide shall comply with the provisions of HG3-1294-80 "Magnesium Oxide"; ② Magnesium oxide must be dried before use; ③ The heating material used for the electric heater is 0Cr27A17Mo2 high-resistance electric heating alloy wire, with an operating temperature of 400°C, and technical requirements according to GB1234 "High-Resistance Electric Heating Alloy"; ④ The protective tube material of the electric heater is 1Cr18Ni9Ti heat-resistant stainless steel tube. Its technical requirements shall comply with YB804 "Stainless and Acid-Resistant Steel Seamless Tubes". Use of other materials shall be agreed upon between the manufacturer and the user; ⑤ The inside of the protective tube for the electric heater shall be deburred, then cleaned with gasoline or kerosene, and dried before use. 2. The finished electric heater shall meet the following requirements: ① The rated working voltage of the electric heater is 220±20V. DC 100V, low voltage 50V; ② For insertion length within 1m, the straightness of the centerline shall not exceed Ø0.3mm; for insertion length between 1-2m, the straightness of the centerline shall not exceed Ø0.4mm; ③ The diameter deviation of the insertion part is -0.20mm/-0.50mm; ④ The length deviation of the insertion part is ±5mm, the heating length deviation is ±5mm, and the cold end length at the bottom is 25-30mm; ⑤ The electric heater shall heat evenly during use, and local overheating is not allowed. (II) When conducting a life test on the electric heater, each heating time is 10-20min. Under intermittent heating conditions, with the total gap between the bolt center hole and the outer diameter of the electric heater being 0.8-1.3mm, the cumulative life shall be no less than 50h. (III) The connection between the alloy resistance wire and the lead-out wire shall be firm and reliable, without looseness. The shell must be well grounded. (IV) After the steel tube of the electric heater is cold-drawn and reduced, its surface shall be inspected by dye penetrant testing or with a magnifying glass of 5x or more, and there shall be no cracks or other defects. The tube shall be formed in one direction during reduction. (V) The sealing at the cold end of the electric heater shall be tight to prevent moisture from entering and damaging the insulation. (VI) After the electric heater is manufactured, after one and a half months, its insulation resistance shall be measured at room temperature with a 500V megohmmeter (can be performed at the manufacturer or user site) and shall not be less than 50MΩ.