WO2008113245A1

WO2008113245A1 - A magnetic latching external relay

Info

Publication number: WO2008113245A1
Application number: PCT/CN2008/000171
Authority: WO
Inventors: Xiaozhi Sun; Ziyou Zhang; Shicai Xie
Original assignee: Zhejiang Prestige Electronic Co., Ltd.
Priority date: 2007-03-20
Filing date: 2008-03-20
Publication date: 2008-09-25

Abstract

A magnetic latching external relay for a kilowatt-hour meter is composed of an electromagnetic system, a contact system, outlet terminals and a shell ( 25 ). The electromagnetic system and the contact system are located inside the shell ( 25 ). The outlet terminals are distributed on the two sides of the shell ( 25 ). One end of the outlet terminals has a style corresponding with the leading-out ends of the kilowatt-hour meter, and the other end has a style corresponding with the connecting terminals inside the kilowatt-hour meter. A plunger magnetic pole structure for a relay includes a magnetic yoke ( 19 ), an armature ( 20 ), at least one magnetic pole ( 18,23 ) and at least one coil ( 16 ), wherein the magnetic pole ( 18,23 ) is fixed, and the armature ( 20 ) is connected with a connecting link ( 17 ) and transmits to a driving rod ( 10 ) by the connecting link ( 17 ) to realize the turnon and switchover of contact heads. The peripheral of the plunger magnetic pole structure is a close magnetic circumstance composed of a magnetic plate ( 15 ) and the magnetic yoke ( 19 ).

Description

Magnetic holding external relay

The present invention relates to a magnetic holding relay, and more particularly to a magnetic holding external relay for connecting a lead terminal of an electric energy meter and a contact member of a relay as a whole, and a suction magnetic pole structure for a magnetic holding relay, belonging to a low voltage Electrical technology field.

Background technique

Magnetic retention relays typically consist of an electromagnetic system, a contact system, and a housing. The electromagnetic system consists of a coil, a magnetic steel component, a magnetizer yoke, a magnetic deflector, etc. The magnetic steel components (including the armature) are mostly I-shaped; the contact system consists of dynamic and static contact points and a coil spring that ensures the contact pressure of the contact point. Or a piece of spring. The insulated contact rod is used to connect the contact system and the magnetic steel system to realize transmission and linkage. The relay has its output state changed under the specified excitation amount, but it can maintain the final state after the excitation is cancelled. This relay is widely used in existing prepaid and remote meter reading meters.

With the full implementation of China's urban and rural power grid construction and transformation projects, the implementation of the “one household, one meter” system, the prepaid, remote meter reading energy meter has been rapidly popularized. The relay is the key actuator in the prepaid energy meter that automatically opens and closes according to the control signal. Since the prepaid electric energy meter needs to be in a working state for a long time, the electric energy meter itself requires low power consumption and low temperature rise, so many new requirements different from ordinary relays are proposed for the relay, for example, the contact temperature should not be higher than 50 ° C, the contact The closing pressure depends on the magnitude of the current passing through, and should generally be greater than 3N to 6N.

However, the existing self-retaining relays for electric energy meters basically adopt a built-in installation method. This built-in installation method has many defects, mainly reflected in the following aspects: 1. The control board, transformer, relay, magnetic card interface, etc. are installed in a very limited space, and the working temperature of the relay is concentrated in the electric energy meter, Conducive to the emission, so there is a defect of temperature rise; 2. This type of relay is affected by the magnetic pole structure of its electromagnetic system during use. The armature and the pole face are mostly in contact with the wire or small area when the contact is made, and the holding force is small. Limited by the holding force, the contact pressure between the contact points is small, so the operational reliability is adversely affected. 3. The internal conductive section of the relay is small, the heat is generated, and additional electric energy is consumed, and the internal temperature of the electric meter rises and thus the electric energy is increased. The detection and measurement modules in the table create safety hazards. 4. The relay is installed with other electrical components and is susceptible to electromagnetic interference and malfunction. Due to the above-mentioned defects, the safety and reliability of the electric energy meter are degraded, so that the existing prepaid and remote meter reading electric energy meters cannot be more widely used. Summary of the invention

SUMMARY OF THE INVENTION A primary object of the present invention is to provide a magnetically held external relay that integrates a lead terminal of an electric energy meter and a contact member of a relay as a whole. The magnetic holding relay is externally mounted and is especially suitable for use in prepaid, remote meter reading three-phase energy meters.

Another object of the present invention is to provide a suction type magnetic pole structure for a magnetic holding relay.

In order to achieve the above object, the present invention adopts the following technical solutions:

A magnetically held external relay characterized by:

The magnetic holding external relay is composed of an electromagnetic system, a contact system, a lead terminal, and a housing;

Wherein the electromagnetic system and the contact system are located inside the housing;

The lead terminals are distributed on both sides of the housing, one end meets the requirements of the lead end of the electric energy meter, and the other end meets the requirements of the connecting terminal inside the electric energy meter.

Wherein, the casing is injection-molded by engineering plastic, and the lead-out terminal is integrally formed with the casing by injection molding.

Alternatively, a plurality of openings are formed on the long sides of the two sides of the casing, and the lead terminals are assembled into the casing in an inserted manner, and the fixing of the casing is achieved by using high temperature resistant glue or fastening screws, and the fixed terminals are fixed. After laying the insulating isolation layer, place the movable part of the electromagnetic system and the contact system.

The contact system consists of a bridge double break point contact point assembly 9, a static contact point, a push rod 10, a coil spring and/or a leaf spring 11, the push rod 10 being placed in the middle, connecting the three-phase moving contact bridge 9 And the contact system and the electromagnetic system are connected by a connecting rod 17, in which a coil spring and/or a leaf spring 11 are placed.

In the static contact assembly, the electrical contacts are fixed to the connecting piece by riveting or welding, and the connecting piece is bent and formed according to the position of the relay lead-out terminal.

The movable contact point assembly is an electrical contact corresponding to the fixed contact on both sides, and is fixed to the sheet connecting piece by riveting or welding.

An arc-extinguishing grid is disposed between the moving and static contact points.

The electromagnetic system includes a closed square or cylindrical magnetic yoke, an armature, at least one magnet, at least one magnetic pole, at least one coil, the magnetic pole is fixed in position, and the armature is connected to the pull rod. The magnet is placed beside the armature, and the armature is transmitted to the push rod through the connecting rod to realize the switching of the contact point. The periphery of the electromagnetic system is composed of a magnetic conductive plate and a magnetic yoke to form a closed magnetic environment. A prepaid remote meter reading type electric energy meter, characterized in that:

The relay used in the electric energy meter is the above-mentioned magnetic holding external relay, and the magnetic holding external relay is externally disposed outside the electric energy meter, and the lead terminal is integrated with the connecting terminal inside the electric energy meter. That is, the terminal of the relay is the terminal of the meter.

A suction type magnetic pole structure for a relay used in an electromagnetic system of a magnetic holding relay, characterized in that:

The suction magnetic pole structure comprises a yoke, an armature, at least one magnetic pole and at least one coil, the magnetic pole is fixed in position, the armature is connected with the connecting rod, and the armature is transmitted to the push rod through the connecting rod to realize the contact point connection. And switching; the periphery of the suction magnetic pole structure is composed of a magnetic conductive plate and a magnetic yoke to form a closed magnetic environment.

Wherein, the magnetic poles are two, respectively fixed at two ends of the magnetic pole structure, wherein the magnetic pole of one end is hollow to pass through the connecting rod.

When the magnetic pole is one, it is fixed at one end of the magnetic pole structure, and the armature is located at the other end of the magnetic pole structure opposite to the magnetic pole.

The magnetic pole and the outer portion of the armature are surrounded by a coil frame wall, and the magnet holders are provided with magnets of opposite polarities corresponding to the outer portion of the armature.

A magnetic holding relay characterized in that - the electromagnetic system of the magnetic holding relay employs the above-described suction type magnetic pole structure.

The magnetic holding relay is a relay for a prepaid remote meter reading type electric energy meter, and the relay is externally disposed outside the electric energy meter, and the lead terminal is correspondingly connected with a connecting terminal inside the electric energy meter.

The magnetic holding external relay provided by the invention integrates the lead terminal of the electric energy meter and the contact system of the relay to realize the integration of the lead terminals of the relay and the electric energy meter, thereby significantly reducing the temperature rise of the relay, saving resources and cost. It is especially suitable for the technical trend of the development of existing electric energy meters to high power and high reliability. In addition, the suction magnetic pole structure provided by the present invention can realize a large contact holding force, increase the contact pressure between the contact points, and increase the conductive cross section of the conductive mechanism in the relay to increase the conductivity of the relay. The relay using the magnetic pole structure has strong anti-interference ability and reliable operation.

DRAWINGS

The invention will now be further described with reference to the drawings and specific embodiments.

Figure 1 (a) and Figure 1 (b) are side and top views, respectively, of the magnetically held external relay; 2 is a schematic view showing the internal structure of the magnetic holding external relay;

Figure 3 is a perspective view showing the contact system of the relay and the contact system and the terminal of the electric energy meter;

Figure 4 is a schematic view showing the structure of a coil spring and a leaf spring in a contact system in a relay. Figure 5 is a schematic view showing the internal structure of the first embodiment of the suction magnetic pole structure;

Figure 6 is a schematic view showing the internal structure of a second embodiment of the suction type magnetic pole structure;

7 is a schematic perspective view showing the terminal of the electric energy meter in the relay;

Figure 8 is a schematic structural view of a power meter junction box used in conjunction with the relay;

Figure 9 is a schematic perspective view showing the structure of the external magnetic relay;

Figure 10 is a block diagram showing an embodiment of integrating a precision current transformer into a relay. detailed description

The magnetic retention external relay is composed of an electromagnetic system, a contact system, a lead terminal, and a housing. The electromagnetic system and the contact system are located inside the housing, and the lead terminals are divided into two groups, which are distributed on both sides of the housing. As shown in Fig. 1 (a) and Fig. 1 (b), the salient feature of the present invention is that the relay and the terminal of the prepaid remote meter reading type electric energy meter are integrated. Referring to Figure 1 (b), one end of the relay terminal (the right side in the figure) is in accordance with the requirements of the terminal of the electric energy meter; the other end (the left side in the figure) is in accordance with the requirements of the connection terminal inside the electric energy meter. style.

The housing is injection molded from engineering plastic. There are a plurality of openings on the long sides of the housing for mounting the contact system and the lead terminals; or the lead terminals are injection molded into the housing in one piece. The cavity inside the housing is formed into a groove by engineering plastic to fix the magnetic circuit system and the contact system. The cavity inside the casing is made of engineering plastic, and the middle is not connected, forming a long track as the limit of the movement of the push rod.

The above-mentioned lead-out terminal and the housing have at least two different structural forms: 1. The lead-out terminal of the electric energy meter can be integrally formed with the housing by injection molding; 2. The lead-out terminal of the electric energy meter is assembled into the housing in an inserted manner. The high-temperature glue or fastening screw is used to fix the housing, and an insulating isolation layer is laid on the fixed terminal, and the positioning structure of the fixed electromagnetic system and the contact system is arranged thereon. The electromagnetic system and the contact system are positioned on the insulating isolation layer.

As shown in FIG. 2, the lead terminals 1 to 7 and the electric meter internal terminals 12 to 14 are connected to the three sets of static contact points of the contact system. Wherein, as shown in FIG. 3 and FIG. 4, the contact system consists of three pairs of bridge type double break point contact point assemblies 9, static contact points, push rods 10, coil springs and/or leaf springs 11 and arcing between the contact points. A grid (not shown) is formed. Push rod 10 is placed on the same circuit In the middle of the two-phase contact point, the push rod 10 is connected to the three pairs of bridge double-break point contact point assemblies 9 and is connected to the movable armature 20 via the connecting rod 17. A coil spring and/or a leaf spring 11 is placed in the cavity of the push rod 10 to provide sufficient pressure for the contacts to ensure stable and reliable contact at the contact points.

In the above static contact assembly, the electrical contacts are fixed to the connecting piece by riveting or welding, and the two sides are fixed in parallel in the groove of the housing. The connecting piece is bent and formed according to the position of the relay lead terminal, and is welded to the lead terminal of the relay; or the connecting piece and the lead terminal are directly integrated into one body, bent into an appropriate shape, or the static contact is made by a soft connecting copper brush wire. The components are connected to the relay lead terminals by soldering.

The dynamic contact point assembly is an electrical contact corresponding to the fixed contacts on both sides. The electrical contacts are fastened to the tab piece by riveting or splicing. The three movable contact assemblies are inserted into the rectangular push rod holes formed by injection molding of engineering plastics, and a coil spring or a metal spring which generates a pressure between the contact points is disposed on the back of each movable contact assembly in the push rod. One end of the push rod is connected to the armature connecting rod of the magnetic circuit system.

Referring to FIG. 2, the insulating wall separating the contacts in the housing 25 forms a guiding track for the movement of the push rod 10, and at the bottom of the housing 25 are two convex rails along the moving direction of the push rod 10. . The two rib tracks reduce the contact area between the push rod 10 and the housing 25, reduce the friction during operation, and ensure the reliability of the relay.

In addition, an arc chute may be disposed between the moving and static contact points. With the arc-extinguishing grid, the arc generated when the moving and static contact points are switched is elongated by the arc-extinguishing grid, the arc is extinguished, and the relay switching capability is improved.

Fig. 5 is a schematic view showing the internal structure of a first embodiment of a suction type magnetic pole structure used in an electromagnetic system of a relay. The first embodiment of the suction magnetic pole structure is a double magnetic pole suction type structure including a winding bobbin 24, a coil 16, a magnetic yoke 19, an upper magnetic conductive plate 15, and an upper magnetic pole 18 hinged to the magnetic conductive plate. And a lower magnetic pole 23 on the magnetic yoke 19, a magnetic steel 22, an armature 20, a connecting rod 17, and a pin 21 connecting the connecting rod and the armature.

In the magnetic circuit of the double magnetic pole suction type structure, a closed square or cylindrical magnetic yoke, an armature 20, two magnetic poles 18, 23 and two coils 16 are included. The yoke iron is riveted with fixed magnetic poles at both ends, and the magnetic pole 18 at one end has a hole passing through the connecting rod 17. A moving cylindrical armature 20 is disposed between the two poles 18, 23, and the armature 20 is coupled to the connecting rod 17 by a pin 21. The poles 18, 23 and the outer portion of the armature 20 enclose a bobbin wall, and the armature moves within the coil wall. Two magnets 22 of opposite polarities are provided at the position of the bobbin 24 corresponding to the armature 20. Coil holder 24 Winding is wound up. Thus, under the action of the magnetic field of the magnet 22, the armature 20 is either held by the upper magnetic pole 18 or held by the lower magnetic pole 23 and maintained in a holding state. The winding 16 is connected to the current of the corresponding polarity to form an electromagnetic field, which interacts with the magnetic field of the magnet 22 to change the force state of the armature 20 to be moved by the upper magnetic pole 18 to the lower magnetic pole 23 or to be held by the magnetic pole 23 The lower magnetic pole 23 moves to the upper magnetic pole 18, and the armature after the movement can maintain the position after the signal in the coil winding is removed, thereby realizing the self-holding function. The moving armature is transmitted to the push rod 10 via the connecting rod 17 to effect the switching of the contact points.

In the first embodiment described above, since the double magnetic pole suction type structure is used, the armature 20 is in surface contact with the upper and lower magnetic poles 18, 23, so that the contact area is large, and a reliable holding force can be ensured, so that the relay contact points are Reliable contact force improves the reliability of relay operation.

Figure 6 shows the internal structure of a second embodiment of the suction magnetic pole structure. This embodiment is a single magnetic pole suction type structure, that is, only one magnetic pole is located at the lowermost end of the entire suction type structure, and the armature is connected with the push rod of the relay to reciprocate up and down to realize the contact and switching of the contact point. The armature after the movement maintains the position after the signal in the coil is removed, thereby achieving the self-holding function. The above-described single magnetic pole suction type structure is simpler than the double magnetic pole suction type structure, so the cost is slightly lower. It also produces a large pull-in state retention, but the hold-off state in this configuration is much lower than the double-pole suction type.

It should be noted that the prior art includes a BLP brand relay, and the electromagnetic system has a structure similar to that of the second embodiment of the suction magnetic pole structure, but the relay does not have complete electromagnetic shielding performance, so the anti-interference It is not necessary to use the electromagnetic relay of the suction magnetic pole structure.

In the above-mentioned double magnetic pole suction type structure or single magnetic pole suction type structure, an important technical feature is that the periphery thereof is composed of a magnetic conductive plate and a magnetic yoke to form a closed magnetic environment (the magnetic conductive plate and the magnetic yoke are intersected) There may be seams at the place, but it does not affect the electromagnetic shielding effect). This electromagnetic shielding design can significantly reduce the interference of external magnetic fields and improve the operational reliability of the entire relay.

The above-described suction type magnetic pole structure is not limited to use in the magnetic holding external relay provided by the present invention, and it can also be employed in the existing high power magnetic holding relay, step relay, DC electromagnetic relay, and AC electromagnetic relay. The above-described suction type magnetic pole structure can be used as long as the relay has an application requiring a large contact holding force.

Similarly, the magnetic holding external relay provided by the present invention can also adopt other magnetic pole structures, such as a magnetic pole structure used in a common direct current electromagnetic relay or an alternating current electromagnetic relay, etc. Do not repeat them one by one.

Fig. 7 is a schematic perspective view showing the terminal of the electric energy meter in the relay. Figure 8 is a schematic view showing the structure of the power meter junction box used in conjunction with the relay. The lead-out terminal is bent and fixed at the bottom of the housing, and one end of the exposed portion is connected to the connection terminal inside the electric energy meter through the electric energy meter junction box shown in FIG. 8 , and the other end is used as the lead end of the electric energy meter, and is connected to the external circuit. . Figure 9 shows the three-dimensional structure of the magnetically held external relay.

In the magnetic holding external relay described in the above embodiment, some components in the three-phase electric energy meter can be integrated into the relay according to the actual application of the three-phase electric energy meter. As shown in Figure 10, the instrument for the three-phase energy meter is integrated into the relay with a precision current transformer. Modularize the meter components. For example, according to the application of the three-phase electric energy meter, the terminal is increased to realize the multi-function of the relay. Simple changes as described above are also within the scope of the invention.

In the above embodiment, the relay described is a magnetically held external relay suitable for a three-phase electric energy meter. However, the magnetic holding external relay provided by the present invention is not limited to three-phase, and its contact system and the lead-out terminal are slightly modified, and can be easily changed to a single-phase magnetic holding relay. It is also within the scope of the invention. Such modifications are well-suited to those of ordinary skill in the art and will not be described in detail herein.

The magnetic holding external relay and the corresponding suction magnetic pole structure according to the present invention have been described in detail above. It will be apparent to those skilled in the art that various modifications may be made without departing from the spirit and scope of the invention.

Claims

Claim

A magnetic holding external relay, characterized in that - the magnetic holding external relay is composed of an electromagnetic system, a contact system, a lead terminal, a housing; wherein the electromagnetic system and the contact system are located inside the housing;

The lead terminals are distributed on both sides of the housing, one end is in a style conforming to the lead end of the electric energy meter, and the other end is in a style conforming to the requirements of the connecting terminal inside the electric energy meter.

2. The magnetically held external relay of claim 1 wherein:

The housing is injection molded from an engineering plastic, and the lead terminal is integrally formed with the housing by injection molding.

3. The magnetically held external relay of claim 1 wherein:

a plurality of mortises are arranged on the long sides of the two sides of the casing, and the lead terminals are assembled into the casing in an inserted manner, and the fixing of the casing is achieved by using high temperature resistant glue or fastening screws on the fixed terminals. Place the insulation system and place the electromagnetic system and contact system.

4. The magnetically held external relay of claim 1 wherein:

The contact system consists of a bridge double break point contact point assembly (9), a static contact point, a push rod (10), a coil spring and/or a leaf spring (11), the push rod (10) being placed in the middle A three-phase moving contact bridge (9) is connected and the contact system and the electromagnetic system are connected via a connecting rod (17), and a coil spring and/or a leaf spring (11) is placed in the cavity of the push rod (10).

5. The magnetically held external relay of claim 1 wherein:

6. The magnetically held external relay of claim 1 wherein:

The magnetic holding external relay according to claim 5 or 6, wherein an arc extinguishing grid is disposed between the movable and static contact points.

8. The magnetically held external relay of claim 1 wherein:

The electromagnetic system comprises a closed square or cylindrical magnetic yoke, an armature, at least one magnetic pole, at least one coil, and two ends of which are riveted with fixed magnetic poles, and one end of the magnetic pole passes through the connecting rod and is connected Rod-oriented hole; located in the middle of the magnetic pole with a movable armature, armature The pin and the connecting rod are fixed by the pin; the outer pole of the magnetic pole and the armature are surrounded by the coil frame wall, and two magnets of opposite polarities are arranged outside the coil bobbin wall corresponding to the armature, and the movable armature is transmitted to the push rod through the connecting rod. Switching of contact points.

9. The magnetically held external relay of claim 8, wherein: the periphery of the electromagnetic system is formed by a magnetically permeable plate and a magnetic yoke to form a closed magnetic environment.

10. A suction type magnetic pole structure for a relay used in an electromagnetic system of a magnetic holding relay, characterized in that:

11. The suction magnetic pole structure for a relay of claim 10, wherein:

The magnetic poles are two, respectively fixed at both ends of the magnetic pole structure, wherein the magnetic poles at one end are hollow to pass through the connecting rod.

12. The suction magnetic pole structure for a relay of claim 10, wherein:

13. The suction magnetic pole structure for a relay of claim 10, wherein:

14. A magnetic holding relay characterized by:

The electromagnetic system of the magnetic holding relay uses the suction magnetic pole structure of claim 10.

15. The magnetic holding relay of claim 14 wherein:

The magnetic holding relay is the magnetic holding external relay according to claim 1, wherein the magnetic holding external relay is externally disposed outside the electric energy meter, and the lead terminal is connected to a connecting terminal inside the electric energy meter.

16. A prepaid remote meter reading type electric energy meter, characterized in that: The relay used in the electric energy meter is the magnetic holding external relay according to claim 1, the magnetic holding external relay is externally disposed outside the electric energy meter, and the lead terminal is integrated with the electric terminal of the electric energy meter.