CN102192252B - Electromagnetic clutch - Google Patents

Abstract

The invention discloses an electromagnetic clutch, including an iron yoke, a coil, and an armature. The device is a sleeve-type structure, and the armature is divided into a sleeve-type outer armature and an inner armature. The inner wall of the outer armature and the outer wall of the inner armature are provided with corresponding notches, and the coil is embedded in the iron yoke. The invention provides an electromagnetic clutch suitable for the needs of the reactor, which has a simple structure, can transmit bidirectional torque, and has a short disengagement time.

Description

an electromagnetic clutch

technical field

The invention relates to the technical field of reactor engineering, in particular to an electromagnetic clutch suitable for reactor working conditions.

Background technique

Electromagnetic clutches are widely used in industry, including jaw clutches, dry single discs, torsion spring clutches, and magnetic powder clutches. In addition, there are snap-fit, solenoid, E-type electromagnets and disc electromagnets that work by magnetic force. The electromagnet structures of these forms are generally composed of an iron yoke, a coil and an armature. In the yoke, the armature can be pulled in by energizing the coil, and its action principle is relatively simple. Commonly used electromagnetic clutch coils are not sealed in the iron yoke, and there is no notch on the armature, and the coils are arranged in a conventional way. In addition, the engagement mode of the commonly used electromagnetic clutch engaging parts depends on rigidity, combination of magnetic force and mechanical force, or friction mode, and the clutch disengagement takes a long time. For example, the existing torsion spring electromagnetic clutch is mainly composed of a driving disc, a torsion spring, a bushing, an armature, a coil, and an iron yoke. The middle tightens the spring and drives the armature to rotate, and the armature further drives the shaft sleeve to rotate. After the power is cut off, the armature and the shaft sleeve are separated, and the shaft sleeve stops rotating. The clutch of this structure can only transmit one-way torque, which is suitable for small machines with low speed and low inertia, and the transmitted torque is relatively small.

At present, the existing electromagnetic clutch cannot meet the needs of the reactor, so it is urgent to develop an electromagnetic clutch suitable for the internal environment of the reactor.

Contents of the invention

The invention overcomes the deficiencies in the prior art, and provides an electromagnetic clutch suitable for reactor needs with simple structure, capable of transmitting bidirectional torque and short disengagement time.

In order to solve the above technical problems, the present invention is achieved through the following technical solutions:

An electromagnetic clutch, including an iron yoke, a coil, and an armature. The key point is that the device is a sleeve-type structure, and the armature is divided into a sleeve-type outer armature and an inner armature. The inner wall of the outer armature and the outer wall of the inner armature are provided with corresponding The notch, the coil is embedded in the iron yoke.

The coil being embedded in the iron yoke means that the iron yoke is provided with an annular groove, and the coil is wound in the annular groove. The outer armature is composed of two materials, the part facing the coil in the axial direction is a non-magnetic material, and the rest is a magnetic material.

Compared with prior art, the beneficial effect of the present invention is:

(1) The device adopts sleeve-type inner and outer armatures. The device structure is simple, and the inner and outer armatures can be used as the driving shaft and the driven shaft respectively. When the coil is energized, the driving shaft and the driven shaft are driven by the driving motor. The drive shafts rotate together, and when the power to the coil is stopped, the drive shaft and the driven shaft can each rotate independently.

(2) The coil is sealed in the annular groove of the iron yoke, which avoids the influence of corrosive gas on the coil and ensures the working performance of the electromagnetic clutch well.

(3) There are corresponding notches on the inner and outer armatures, and most of the magnetic force lines form a magnetic circuit along the magnetic poles (the part between the notches and the notches) of the inner and outer sleeve armatures, so that the inner and outer A circumferential force is generated between the sleeve armatures. The inner and outer armatures are completely combined by magnetic force, which can transmit two-way torque, the transmitted torque is relatively large, and the disengagement time of the clutch is short.

Description of drawings

Figure 1 Sectional view of the clutch

Figure 2 Cross-sectional view of the clutch

1 iron yoke, 2 coils, 3 outer armature, 4 inner armature, 5 annular groove

Detailed ways

Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

An electromagnetic clutch, as shown in Figure 1, the electromagnetic clutch is a sleeve-type structure, which is mainly composed of an iron yoke 1, a coil 2, an outer armature 3, and an inner armature 4, wherein an annular groove 5 is opened on the iron yoke 1, and the annular The coil 2 is embedded in the slot 5 . The coil 2 is sealed in the iron yoke 1, avoiding the influence of corrosive gas on the coil 2, and ensuring the working performance of the electromagnetic clutch. The iron yoke 1, the outer armature 3 and the inner armature 4 are sleeve-type structures respectively, the outer armature 3 and the inner armature 4 are installed in the iron yoke 1, and there is a gap between the iron yoke 1, the outer armature 3 and the inner armature 4. The outer armature 3 is composed of two materials, the part facing the coil 2 in the axial direction is a non-magnetic material, and the rest is a magnetic material. As shown in FIG. 2 , a certain number of notches are provided on the inner wall of the outer armature 3 , and a certain number of corresponding notches are also provided on the outer wall of the inner armature 4 . And the magnetic circuit always forms a loop along the path with the least reluctance, so the lines of force are mostly along the magnetic poles (the part between the notch and the notch) of the inner and outer armatures 4, 3 to form a magnetic circuit, so that the inner , A circumferential force is generated between the outer armatures 4 and 3. The inner armature 4 and the outer armature 3 are engaging parts, and the engaging mode is completely combined by magnetic force, so that the disengagement time of the clutch is short.

The winding direction of the coil 2 in the annular groove 5 is the circumferential direction of the inner armature 4 and the outer armature 3, and the magnetic force line passes through the iron yoke 1, the outer armature 3, and the inner armature 4 to form a magnetic circuit along the axial direction of the coil 2, so that the inner Suction force is generated between the armature 4 and the outer armature 3 .

The device is connected with the reactor control rod drive mechanism, the outer armature 3 is connected with the motor drive part as the output end of the drive part, and the inner armature 4 is connected with the execution part as the input end of the execution part.

When current is applied to the coil 2, a magnetic circuit will be formed between the iron yoke 1, the outer armature 3, and the inner armature 4, because the magnetic circuit will always form a loop along the direction of the smallest reluctance, which will make the inner and outer armatures 4 , 3 move toward the direction where the magnetic poles coincide with the magnetic poles, so that the inner armature 4 and the outer armature 3 are attracted together, which can connect the driving part of the control rod with the transmission chain of the executive part, and make the control rod under the action of the driving force of the motor Moving up and down.

When the current to the coil 2 is stopped, the magnetic field between the inner armature 4 and the outer armature 3 will disappear, so that the attraction force between the inner armature 4 and the outer armature 3 will disappear, causing the transmission chain where the inner armature 4 and the outer armature 3 are located to break Open, so that the transmission chain of the driving part and the execution part is disconnected, so that the transmission chain where the inner armature 4 and the outer armature 3 are located can operate independently. After the drive chain where the inner armature 4 is located rotates independently, the control rod drive mechanism completes the rapid rod drop function.

Claims (2)

1. An electromagnetic clutch, comprising an iron yoke, a coil, and an armature, is characterized in that the device is a sleeve-type structure, and the armature is divided into an outer armature and an inner armature of the sleeve type, and the outer armature and the inner armature are installed in the iron yoke , the inner wall of the outer armature and the outer wall of the inner armature are provided with corresponding notches, the coil is embedded in the iron yoke, the outer armature is composed of two materials, the part facing the coil in the axial direction is non-magnetic material, and the rest Some are magnetically permeable materials. 2 . The electromagnetic clutch according to claim 1 , wherein the coil is embedded in the iron yoke, and an annular groove is opened in the iron yoke, and the coil is wound in the annular groove. 3 .

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