阅读说明：本技术 一种延伸过渡盘引风机电绝缘联轴器 (Electric insulation coupler for extension transition disc induced draft fan ) 是由 王宝华 蒋坤 昌永发 于 2019-06-12 设计创作，主要内容包括：本发明公开了一种延伸过渡盘引风机电绝缘联轴器,包括：半联轴器、外延伸过渡盘、膜片组、连接盘、引风机膜片联轴器中间轴,所述半联轴器为电机侧半联轴器,半联轴器通过过渡盘连接螺栓与外延伸过渡盘连接,外延伸过渡盘采用向电机侧半联轴器延伸的设计,外延伸过渡盘与半联轴器间设置有绝缘板及绝缘套,外延伸过渡盘通过驱动螺栓与连接盘连接,外延伸过渡盘与连接盘之间设置有弹性膜片组,连接盘与引风机膜片联轴器中间轴固定连接,本发明解决了电机两端均有负载轴电流,仅需对电机侧半联轴器进行修改即可,可以作为现有引风机改造为汽电双驱绝缘联轴器的较简且相对成本较低方案。(The invention discloses an electric insulation coupler of an extension transition disc induced draft fan, which comprises: the invention solves the problem that the two ends of a motor are both provided with load shaft current, only the motor side half-coupling needs to be modified, and the motor side half-coupling can be used as a simpler scheme for transforming the existing induced draft fan into a steam-electricity double-drive insulation coupling and has lower relative cost.)

1. An extension transition disk induced draft machine electrical insulation coupling comprising: half-coupling, outer extension transition dish, diaphragm group, connection pad, draught fan diaphragm coupling jackshaft, the half-coupling is motor side half-coupling, its characterized in that: the half-coupling passes through transition dish connecting bolt and extends transition dish to be connected outward, the design that the transition dish that extends adopts to motor side half-coupling extension is extended outward, it is provided with insulation board and insulating cover to extend between transition dish and the half-coupling outward, the transition dish that extends passes through drive bolt and is connected with the connection pad, it is provided with elasticity diaphragm group to extend between transition dish and the connection pad outward, connection pad and draught fan diaphragm coupling jackshaft fixed connection.

2. The extension transition disk induced draft machine electrical isolation coupling of claim 1, wherein: the insulation board is of an annular structure, the insulation board is sleeved on the transition disc connecting bolt, and the insulation board is arranged at the connecting position between the half coupler and the outer extension transition disc.

3. The extension transition disk induced draft electromechanical insulation coupling of claim 2, wherein: the insulating sleeve is sleeved on the transition disc connecting bolt and arranged on the inner wall of the bolt hole of the half coupling.

4. An extended transition disk inducer electrical insulation coupling as set forth in claim 3, wherein: the coupler is suitable for occasions with an elastic diaphragm coupler with an intermediate shaft, and when the insulating coupler is used on the side of an induced draft fan, the other side of the motor is grounded by a carbon brush.

5. An electro-mechanical insulation coupling for an extension transition disc draft fan according to claim 1 or 4, wherein said coupling is installed by: firstly, sleeving a half coupling on a motor shaft in a sleeving manner, wherein an insulating sleeve is not allowed to be arranged on the half coupling during sleeving; secondly, when the temperature of the sleeve is reduced to be close to the ambient temperature after the sleeve is heated, an insulating sleeve and an insulating plate are arranged; thirdly, sequentially combining an external extension transition disc, a connecting disc and an elastic diaphragm set; fourthly, connecting an assembly formed by combining an external extending transition disc, a connecting disc and an elastic diaphragm group with the semi-coupling by using a transition disc connecting bolt; and fifthly, mounting the motor, then finding the center of the connecting disc and the middle shaft of the induced draft fan coupler, and connecting the connecting disc and the middle shaft of the induced draft fan diaphragm coupler by using a bolt after the center is found to be qualified.

Technical Field

The invention relates to the technical field of efficient clean coal power generation and energy conservation, in particular to an electric insulation coupler of a transition disc induced draft fan.

Background

The induced draft fan power consumption of thermal power factory is great, because steam pressure and steam temperature mismatch when the thermal power factory is taken out the vapour and is supplied heat simultaneously, has the decompression link of reducing temperature usually, has produced great energy consumption. The application of the steam-electricity double-drive induced draft fan of the recent high-efficiency thermal power plant is more successful, the technology can better coordinate the contradiction between heat supply and power generation, greatly reduce the station power consumption of the induced draft fan and reduce the energy loss caused by temperature and pressure reduction of steam extraction heat supply.

The steam-electricity double-drive induced draft fan is characterized in that rotating equipment is connected to two ends of a motor, moving and static parts of the rotating equipment are not insulated, and a large shaft of the motor inevitably has shaft voltage, so that shaft current is easily formed between the two ends of the motor and the connecting equipment through the large shaft of the motor, and a speed reducer, a turbine bearing and an induced draft fan bearing box connected with the motor are subjected to electric corrosion to cause equipment damage.

Therefore, how to avoid producing great axle current in the operation process, can provide the current draught fan again and reform transform into the scheme that the comparatively simple and relative cost is lower of vapour electricity double-drive insulation coupling, guarantee the high-efficient nimble heat supply vapour electricity of thermal power factory and drive the important problem that the fan group safe and reliable operation is waited for to solve in the energy-conserving field urgently.

Disclosure of Invention

The invention aims to provide an electric insulation coupler of a draught fan, which is simple to transform and reliable in operation, and adopts the technical scheme that:

an extension transition disk induced draft machine electrical insulation coupling comprising: half-coupling, outer extension transition dish, diaphragm group, connection pad, draught fan diaphragm coupling jackshaft, the half-coupling is motor side half-coupling, its characterized in that: the half-coupling passes through transition dish connecting bolt and extends transition dish to be connected outward, the design that the transition dish that extends adopts to motor side half-coupling extension is extended outward, it is provided with insulation board and insulating cover to extend between transition dish and the half-coupling outward, the transition dish that extends passes through drive bolt and is connected with the connection pad, it is provided with elasticity diaphragm group to extend between transition dish and the connection pad outward, connection pad and draught fan diaphragm coupling jackshaft fixed connection.

Preferably, the insulation plate is of an annular structure, the insulation plate is sleeved on the transition disc connecting bolt, and the insulation plate is arranged at the connecting position between the half coupler and the outer extension transition disc.

Preferably, the insulating sleeve is sleeved on the transition disc connecting bolt and is arranged on the inner wall of the bolt hole of the half coupling.

Preferably, the coupler is suitable for occasions of elastic diaphragm couplers with intermediate shafts, and when the insulating coupler is used on the draught fan side, the other side of the motor is grounded by a carbon brush.

Further, as used herein, the induced draft fan refers to an axial flow type fan used for balancing ventilation and discharging flue gas at an outlet of an electric dust remover of a boiler in a thermal power plant, and can also be used in similar working condition occasions.

Further, when the coupler is installed, the half coupler is firstly sleeved on the motor shaft in a heat mode, when the heat sleeve is installed, according to the principle of expansion with heat and contraction with cold, when the temperature is reduced to the room temperature, the contraction with cold of the half coupler is reduced, and the connection tightness of the half coupler and the motor shaft is enhanced. The insulating sleeve is not allowed to be installed on the half coupler during sleeve heating, the insulating sleeve and the insulating plate are installed when the temperature of the sleeve heating end is reduced to be close to the ambient temperature, the insulating sleeve is installed to cause the insulating sleeve to be heated and deformed during sleeve heating, and the insulating sleeve is installed to ensure the service life of the insulating sleeve when the temperature of the sleeve heating is reduced to the room temperature. Then the outer extension transition disc, the connecting disc and the elastic diaphragm group are sequentially combined, then a combined piece formed by combining the outer extension transition disc, the connecting disc and the elastic diaphragm group is connected with the semi-coupling through a transition disc connecting bolt, and the bolt is used for connecting, so that the tightness of the mounted combined piece is ensured, and on the other hand, once part of parts need to be maintained and replaced in the actual use process, the disassembly is convenient. After the motor is installed, the centers of the connecting disc and the middle shaft of the draught fan coupling are found, and after the centers are found to be qualified, the connecting disc and the middle shaft of the draught fan diaphragm coupling are connected through bolts. Confirm the center of connection pad and draught fan shaft coupling jackshaft for after the installation, connection pad and draught fan shaft coupling jackshaft are in concentric shaft, can not be because of the axle skew that the decentraction caused in the time of in-service use, guarantee the life and the safe in utilization of equipment.

Has the advantages that: the utility model discloses a two insulating shaft couplings that drive of vapour electricity adopt the electrical insulation shaft coupling, the cooperation motor opposite side carbon brush ground connection can be more reliable solve the draught fan and the little steam turbine (including drive speed reducer) bearing that the axle current caused, the gear galvanic corrosion problem, it all has the better more reliable scheme of load axle current to solve the motor both ends, the transition dish adopts the design of extending to motor side half-coupling, this kind of design need not to modify the middle major axis of original draught fan, only need to motor side half-coupling modify can, can transform into the more simple and the lower scheme of relative cost of vapour electricity two insulating shaft couplings as current draught fan.

Drawings

FIG. 1 is a drawing of the insulating coupling structure of the extension transition disk of the induced draft fan

Wherein: 1. half-coupling 101, screw hole 2, insulating cover 3, insulation board 4, outer extension transition dish 5, connection pad 6, elastic diaphragm group 7, drive bolt 8, transition dish connecting bolt 9, draught fan diaphragm coupling jackshaft.

Detailed Description

The invention is further elucidated with reference to the figures and embodiments.

As shown in fig. 1, an extension transition disk induced draft electrical insulation coupling comprises: the device comprises a half coupling 1, an external extension transition disc 4, a diaphragm group 6, a connecting disc 5 and a draught fan diaphragm coupling intermediate shaft 9. Half-coupling 1 is the motor side half-coupling, half-coupling 1 is connected with outer extension transition dish 4 through transition dish connecting bolt 8, outer extension transition dish 4 adopts the design that extends to motor side half-coupling 1. The outer extension transition dish 4 and half-coupling 1 are provided with insulation board 3 and insulating cover 2 within a definite time, insulating cover 2 cover is on transition dish connecting bolt 8, and insulating cover 2 sets up the bolt hole 101 inner wall at half-coupling 1, insulation board 3 is the loop configuration, and 3 covers of insulation board are on transition dish connecting bolt 8, and insulation board 3 sets up the junction between half-coupling 1 and outer extension transition dish 4. The outer extension transition dish 4 is connected with connection pad 5 through drive bolt 7, be provided with elasticity diaphragm group 6 between outer extension transition dish 4 and the connection pad 5, connection pad 5 and draught fan diaphragm coupling jackshaft 9 fixed connection.

Further, as used herein, the induced draft fan refers to an axial flow fan used for balancing ventilation and discharging flue gas at an outlet of an electric dust remover of a boiler in a thermal power plant, and can also be used in similar working condition occasions.

The specific working principle is as follows: the coupler is suitable for occasions with elastic diaphragm couplers with intermediate shafts, and when the insulating coupler is used on the side of an induced draft fan, the other side of the motor is grounded by a carbon brush. Because the motor core stamped sheet actually has the condition of abutted seam, tiny burr and uneven material, the shaft voltage can be inevitably produced after the motor shaft turn chain distorts the magnetic force line, and the motor bearing is subjected to insulation treatment, so under the action of the shaft voltage, the shaft current can flow through the induced draft fan bearing, the drive small steam turbine bearing or the speed reducer gear through the rotating part connected with the two ends of the motor rotor together, and the equipment is damaged due to the electric corrosion. The side of the induced draft fan adopts an electric insulation coupler to cut off the passage of shaft current from the bearing clearance of the induced draft fan to the bearing seat, thereby achieving the purpose of protecting the induced draft fan. Meanwhile, after the large shaft is grounded by adopting the carbon brush at the other side of the motor, the shaft current cannot form a loop through the side of the driving turbine, and a side speed reducer of the turbine and a bearing of the driving turbine are protected. Transition dish 4 extends to half-coupling 1 side for whole coupling subassembly position takes place the skew, has also changed the relative position of insulation board 3 with half-coupling 1, when reaching insulating effect, can avoid the change to the draught fan again.

The above-mentioned features of the invention, or those of the embodiments or examples may be replaced by any alternative features serving the same, equivalent or similar purpose. Thus, unless expressly stated otherwise, the features disclosed are merely generic examples of equivalent or similar features.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. Any methods and materials similar or equivalent to those described herein can be used in the practice of the present invention. The preferred embodiments and materials described herein are intended to be exemplary only.