CN2044111U - Explosion insulating fractional electric motor - Google Patents

Abstract

The utility model relates to an explosion insulating fractional electric motor which is matched and used on equipment and a device in various different explosive gas atmospheres, comprising a motor baseplate (1), a motor stator core (2), a stator winding (3), an electric machine rotor (4), an electric machine axle (5), a bearing (6), a front end cap (7), a bearing inner cap (8), a rear end cover (9), an outgoing line seat cylinder (10), a sealing ring (11), a space block (12), an outer hexagon screw plug (13) and a gapless sealing cable (14) according to the requirement of explosion insulating. The utility model is of improved and safe explosion insulating performance, reaching the requirement of national security standard.

Description

Explosion insulating fractional electric motor

The utility model is to belong to flame-proof type low-power machine series in the what fire-proof motor, be a kind of in explosive gas atmosphere as matching used II c level flame-proof type low-power machine on equipment and the device.

External explosion separation structure on explosion-proof motor, have and adopt the bent road formula explosion separation structure of (or claiming labyrinth type), it is to be made up of one group of stationary ring and one group of rotating ring that is installed in the rotating shaft that is installed in the end cap inboard respectively, form the Qu Lu gap between quiet, the rotating ring, it promptly is drive of motor flame proof gap partly, but dynamic and static ring processing and matching requirements are higher, and structure is complicated.Another kind of pushing lid rotating shaft explosion separation structure, mainly end play is changed into a pair of radial clearance, pressure effect during by internal explosion and plane clearance is reduced, but this structure will be advanced along the keyway slip on the axle that is rotating by the pushing cover that pressure in the blast will rotated, because glade plane space is very little, overcome factors such as rotator inertia and mechanical friction, action is unreliable to the greatest extent, complex structure fails to apply.

Domestic, common small-power flame-proof type asynchronous motor commonly used at present, its blast resistance construction is through, this through structure is when explosive test, domestic coefficient of safety is than external height, only by the requirement of explosion proof of a kind of gas (use of hydrogen place), can not reach test requirements documents such as II c level acetylene gas before domestic.

The purpose of this utility model is that to carry a kind of explosion separation structure more effective, more reasonable, explosion insulation performance is safer reliable, can in various explosive gas atmospheres, use, make the external form volume-diminished of motor, processing, easy for installation, and meet the flame-proof type low-power machine of the regulation of new national standard GB.3836.1-83 " explosive atmosphere electrical apparatus for explosive atmospheres--general requirement " and GB.3836.2-83 " explosive atmosphere electrical apparatus for explosive atmospheres--every type electric equipment " d " ".The flame proof rank is d II c, also can be used for d II B, d II A and d I level place.

The utility model is achieved in that the end cap of motor does not have side to be convex form, be Qu Luzhuan with the friction tight internal bearing cover of rotor shaft, the convex form of surveying in the end cap matches with the Qu Luzhuan of internal bearing cover and constitutes the Qu Lu gap, it is several curved to utilize the Qu Lu gap that the path of damp is turned, and length of flame proof joint has extended; The terminal box of motor adopts the direct introducing device of hermetically-sealed cable, dwindles the volume of terminal box; The seam flameproof joint of the end cap of motor and support has better fit, and fastening with interior hexagonal Luo bolt.

Flame-proof type structure in the utility model is compared with the blast resistance construction of the small-power flame-proof type asynchronous motor of using always at present, by what is bell-type flame-proof type structure etc. on the bearing chamber structure, make flameproof joint reduce to 4～5 pairs by former about 15 pairs, simplify explosion separation structure greatly and improved explosion insulation performance effectively, simplified manufacturing process, management, processing and quality examination that favourable what is produced the flame proof part have reduced production cost.The explosion insulation performance coefficient of safety is high than countries such as English, morals, and is safe and reliable, is applied in inflammable and explosive place and can prevents blast and fire incident effectively, reaches country to safe requirement, has social benefit widely.

Accompanying drawing 1 flame-proof type low-power machine general structure schematic diagram;

Accompanying drawing 2 blower fans flame-proof type low-power machine general structure schematic diagram.

Shown in accompanying drawing 1, the flame-proof type low-power machine is by electric machine stand 1, motor stator core 2, stator winding 3, rotor 4, machine shaft 5, bearing 6, front end housing 7, internal bearing cover 8, rear end cap 9, outlet seat tube 10, sealing ring 11, cushion block 12, outer-hexagonal Luo fills in joint 13, and gap-free sealed cable 14 is formed by the flame proof requirement.The explosion separation structure key position of explosion-proof motor is bearing chamber structure and outlet box structure etc.One of characteristics of the present utility model are, its flame-proof type bearing chamber structure is by machine shaft 5, bearing 6, and front end housing 7, internal bearing cover 8 is formed.Before, rear end cap 7,9 inboards, be static convex form by rotating shaft 5 places for one, internal bearing cover 8 is bell-type live bearing inner cap, the Qu Luzhuan that rotates with bearing inner race is arranged near the bearing side, internal bearing cover 8 tightly is nested together with motor rotary shaft 5, rotate with rotating shaft, make front and rear cover 7, the Qu Luzhuan gap that 9 static convex forms and internal bearing cover 8 rotate forms radially Qu Lu gap, be that diameter is poor between effective sheet, the flameproof joint total length of Qu Lu can be not more than 20mm, and its feature is to utilize the Qu Lu gap, and it is several curved that the damp path is turned, length of flame proof joint has extended, effectively, play the flame proof effect reliably, improved explosion insulation performance.When forward and backward end cap 7,9 and electric machine stand 1 forms length of flame proof joint: V≤2 liter, L 〉=12.5mm; During V 〉=2 liter, L 〉=25mm.Correspondingly increase support length and fin length for adapting to the seam length of fit, and shortened end cap length, can increase the ventilation and heat effective area like this, favourable reduction temperature rise etc.With interior hexagonal Luo bolt that forward and backward end cap 7,9 is fastening with support 1.Its junction is provided with counterbore.When if motor does not need the external cooling self-ventilation, blower fan necessary electromotor as shown in Figure 2, then do not establish explosion suppresion surface in the rear bearing outside, back shaft extension is not overhanging, simultaneously the rear end cap of motor does not have the axis hole of going out, and cancels outer self-cooling fan of original motor and fan housing, changes into shown in the rear end cap 9(accompanying drawing 2 of no axis hole) and internal bearing cover without issue, both reduce the flame proof machined surface, improved explosion insulation performance again.

Other characteristics are to adopt outlet seat tube 10, sealing ring 11; Cushion block 12, the direct introducing device of hermetically-sealed cable that outer-hexagonal Luo plug joint 13 and no gap cable 14 are formed replaces original terminal box, has dwindled volume significantly than general flame-proof type terminal box, but improves explosion-proof performance; On electric machine stand 1, be provided with three or many square-section muscle, every muscle biend is provided with the Luo hole that is connected with end cap, if with blower fan when supporting, outer surface two sides that installation form also can be made into each muscle are provided with two in installation Luo hole, be connected in T type connecting rod one end both sides, the adjustable connection can be done with supporting equipment or device in the both sides of the T type bar other end.When being used on the blower fan, can be connected with the air duct of blower fan.

The utility model is at stator punching, and the Electromagnetic Design parameter on rotor punching and the winding and the structural element of non-explosion-proof part have been considered the versatility of establishing with whole nation unification.For example BAO2F type blower fan is the embodiment that the utility model is applied to the flameproof motor of the fractional horse-power power on the axial fan in the inflammable and explosive place with flame-proof type small-power step threephase asynchronous (hereinafter to be referred as motor), is based on the index of electric property such as AO2 series.The rated frequency of BAO2F type flameproof motor is 50HZ, and rated voltage is 380 volts, is benchmark continuous operation example with S1.Press different seat No. (as 801 and 802,712 and 711,632 and 631) with different synchronous speeds (as 3000r/min 1500r/min 1000r/min etc.), power is with seven grades of 0.09kw～0.75kw, the overall dimension of motor, installation dimension changes by the seat No. difference.

The stator punching of the BAO2F type motor that exemplifies, rotor punching and stator winding parameters all corresponding A O2 series are general, be the same rotational speed of corresponding same seat No., its motor stator punching of the motor of equal-wattage, rotor punching and stator winding and AO2 series are general.Supporting because of present embodiment motor and axial flow blower, belong to self-ventilation, then in the rear bearing chamber quick-fried in the air, back shaft extension is also not overhanging, and rear end cap is the rear end cap 9 of no axis hole, internal bearing cover without issue.The motor of the plurality of specifications of several seat No. of present embodiment is up to the standards in accordance with regulations through explosion-proof relevant departments, obtains d II BT4, the explosion-proof test certificates of competency such as d II CT4.

Claims (3)

1, a kind of flame-proof type low-power machine that in explosive gas atmosphere, uses, it is by electric machine stand 1, motor stator 2, stator winding 3, rotor 4, machine shaft 5, bearing 6, front end housing 7, internal bearing cover 8, rear end cap 9, outlet seat tube 10 compositions such as grade; It is characterized in that front end housing 7 and the rear end cap 9 inboard axis hole places of leaning on are static convex form, internal bearing cover 8 is bell-type Qu Luzhuan by the bearing side.

2, flame-proof type low-power machine according to claim 1, the bell-type Qu Luzhuan that it is characterized in that changeing the internal bearing cover 8 of merit cooperates with the static convex form of front end housing 7 or rear end cap 9 that to form between effective sheet diameter poor, and the flameproof joint total length is not more than 20mm.

3, flame-proof type low-power machine according to claim 1, it is characterized in that front end housing 7 and rear end cap 9 or 9 and electric machine stand 1 form flameproof joint, during its length: V≤2 liter, L 〉=12.5mm; During V 〉=2 liter, L 〉=25mm is connected with counterbore with support 1, and is fastening with interior hexagonal Luo bolt.

Images