Product Details

Bolts heating rod and DC cabinet features: To meet the needs of loading and unloading bolts in high, medium and low pressure cylinders of steam turbines and improve work efficiency, our company has developed two series and more than 10 varieties of bolt heating devices. The DJ22-1 steam turbine bolt low-voltage heating device has been used by many power plants. It is safe, reliable, easy to operate, long service life, good effect, and popular among users. The DJ22-1 DC adjustable bolt heating control cabinet is used with DC bolt heaters. It has the advantages of stable and adjustable output DC voltage (0~220V adjustable), multiple output channels (up to 12 loads), high output power, safety and reliability. Usage precautions: 1. The control cabinet shell must be reliably grounded. 2. The phase and neutral wires between the bolt heater plug and the cabinet socket must be correctly connected, and misconnection is strictly prohibited. 3. When installing or removing the bolt heater, the power switch must be turned off. For DJ22-1 series control cabinets, the voltage adjustment and indication should be at the minimum position; the DJ22-1 low-voltage control cabinet is strictly prohibited from voltage shifting with load. 4. When connecting loads, pay attention to the balance between the three phases. 5. If the connector is damaged, it must be replaced with the original specification. 6. The special bolt heater needs to be manufactured according to the specific geometric dimensions of the bolt. When ordering, please provide: a. bolt outer diameter; b. bolt outer diameter; c. total bolt length; d. nut length; e. the heating control cabinet used. Model specifications and parameters are as per the table below: Approved by the Ministry of Mechanical and Electronic Industry of the People's Republic of China on 1988-07-20, implemented on 1989-07-01. Note 1: The parameters listed in this table are applicable to bolts with center hole diameter d=22.6±0.2mm. For bolts not conforming to the center hole diameter and specifications listed, the parameters shall be agreed upon by the user and the manufacturer. Note 2: The surface power density of the electric heaters listed in this table is 8-11W/cm². Serial No. Heater Model Bolt Diameter Protection Tube Length Heating Length Cold End Length 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 DJ22-1 bolt heating rod and DC cabinet technical requirements: (1) Steam turbine DJ22-1 bolt heating rod and DC cabinet shall meet the following requirements: 1. Raw materials for electric heaters shall meet the following requirements: ① The composition of insulating material magnesium oxide shall comply with HG3-1294-80 "Magnesium Oxide"; ② Magnesium oxide must be dried before use; ③ The heating material used in the electric heater is 0Cr27A17Mo2 high resistance electric heating alloy wire, with working temperature of 400°C, technical requirements according to GB1234 "High Resistance Electric Heating Alloy"; ④ The protective tube material for the electric heater is 1Cr18Ni9Ti heat-resistant stainless steel tube, technical requirements according to YB804 "Stainless Acid-Resistant Steel Seamless Tube"; other materials shall be agreed upon by the manufacturer and the user; ⑤ The protective tube for the electric heater shall be deburred internally, cleaned with gasoline or kerosene, and dried before use. 2. Finished electric heaters shall meet the following requirements: ① 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 center line shall not exceed φ0.3mm; for insertion length between 1-2m, the straightness shall not exceed φ0.4mm; 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 bottom cold end length is 25-30mm; ⑤ The electric heater shall heat evenly during use, and local overheating is not allowed. (2) During the life test of 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 not be less than 50h. (3) The connection between the alloy resistance wire and the lead wire shall be firm and reliable, without looseness. The shell must be well grounded. (4) After cold drawing and tube reduction, the steel tube of the electric heater shall be inspected by dye penetrant or a magnifying glass of 5x or more, and there shall be no cracks or other defects. Tube reduction shall be one-way forming. (5) The sealing at the cold end of the electric heater shall be tight to prevent moisture from entering and damaging the insulation. (6) After the electric heater is manufactured, after one and a half months, measure its insulation resistance at room temperature with a 500V megohmmeter (manufacturing...