Three-phase intelligent electric energy meter

Abstract

The invention relates to the technical field of electric energy meters, in particular to a three-phase intelligent electric energy meter which comprises an electric energy meter body and an insulating cover, a wiring area is arranged on the lower side of the front end of the electric energy meter body, the insulating cover is detachably installed at the front end of the wiring area, a third sleeve is arranged in the wiring area and made of a conductive material, and a connector lug is arranged at the lower end of the third sleeve. The connector lug is electrically connected with a circuit system in the electric energy meter body; according to the electric energy meter, the third sleeve, the second sleeve and the driving assembly are arranged, meanwhile, the third sleeve is provided with the contact with the elastic section, the second sleeve extrudes the contact to clamp the electric wire when moving downwards under the driving effect of the driving assembly, and therefore communication between the electric wire and the electric energy meter body is achieved, the wiring process is simplified, and meanwhile the wiring efficiency is improved. The elastic potential energy of the elastic section makes up thermal expansion deformation caused by heating and cold shrinkage deformation caused by cooling, so that stable contact between the contact and the electric wire is ensured, and the reliability and stability of the wiring position are ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of electric energy meters, in particular to a three-phase intelligent electric energy meter. Background Art

[0002] As a device for measuring and recording the use of electric energy in a three-phase power system, the three-phase smart energy meter is widely used in industrial and commercial fields, such as industrial plants, workshops, shopping centers and office buildings. At present, the connection between the smart energy meter and the power grid generally adopts a bolt fixing structure, which can provide a reliable contact point, thereby reducing the risk of poor contact. At the same time, the bolt fixing structure can resist the tension of the wire harness and prevent the wire harness from falling off at the wiring position when the wire harness is pulled. However, in a high-load three-phase power grid, the heat generated by the current during operation can easily lead to thermal expansion at the bolt joint. After multiple starts and stops in the three-phase circuit, the bolts switch between the two states of thermal expansion and cold contraction, which can easily cause the bolts to loosen, resulting in poor contact at the wiring point, affecting the safety of the three-phase energy meter. In addition, the bolt fixing structure provides sufficient wiring space, which is easy for criminals to steal electricity.

[0003] In view of the above problems, the prior art provides some solutions, such as the wiring structure is set as a plug-in structure, which is easy to operate, saving time and manpower. At the same time, the plug-in structure can effectively inhibit the theft of electricity by criminals; however, the plug-in structure is prone to wear of the plug interface after long-term plugging and unplugging, and is prone to poor contact. At the same time, the plug-in structure has stronger sealing than the bolt connection, which is not conducive to the heat discharge at the connection, and is prone to excessive temperature at the connection and fire. Another example is the welding structure, which welds the wire to the electric energy meter. The release resistance of the welding structure is low, and the connection is firm, which can ensure the stable connection between the wire and the electric energy meter; however, the welding structure is an irreversible connection, which is difficult to replace and maintain after welding, and it is easy to cause internal overheating damage to the electric energy meter during the welding process. Summary of the invention

[0004] The purpose of the present invention is to provide a three-phase smart energy meter to solve the problem that poor contact easily occurs in the connection structure of the existing three-phase smart energy meter, resulting in reduced accuracy of the measurement results of the three-phase smart energy meter, and at the same time solve the problems existing in the existing solutions.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A three-phase intelligent electric energy meter comprises an electric energy meter body and an insulating cover, wherein a wiring area is provided at the lower side of the front end of the electric energy meter body, and the insulating cover is detachably installed at the front end of the wiring area; specifically, a No. 3 bushing is provided in the wiring area, the No. 3 bushing is connected to the electric energy meter body, a wiring head is provided at the lower end of the No. 3 bushing, the wiring head is electrically connected to the circuit system in the electric energy meter body, and a plurality of contacts are provided in an annular array at the upper end of the No. 3 bushing, the contacts comprising an elastic section, an arc section and The contact end, the elastic section extends out of the upper side of the No. 3 sleeve, the arc section is located at the upper end of the elastic section, the arc section is bent toward the inner side of the No. 3 sleeve, the inner side of the arc section is the contact end, the No. 3 sleeve is coaxially slidably connected with the No. 2 sleeve, a plurality of limiting holes are provided in an annular array on the side wall of the No. 2 sleeve, the limiting holes are waist-shaped holes, the arc section passes through the limiting holes and extends into the No. 2 sleeve, and a driving component for driving the No. 2 sleeve to move downward is provided on the upper side of the No. 2 sleeve.

[0007] When wiring, the wire is inserted into the No. 3 casing, and the driving component is started. The driving component drives the No. 2 casing to move downward. When the No. 2 casing moves downward, the upper inner wall of the limiting hole is first fitted with the upper end surface of the arc segment. As the No. 2 casing continues to move downward, the limiting hole and the arc segment slide, and the arc segment moves toward the inside of the No. 2 casing due to the extrusion of the inner wall of the limiting hole. The elastic segment undergoes elastic deformation, and the inner diameter of the contact end becomes smaller until the contact end fits with the outer wall of the wire. At this time, the wire is in a connected state with the circuit system in the electric energy meter. The driving component continues to drive the elastic segment to bend inward, and the pressure applied by the contact end to the wire increases, further tightening the constraint of the contact end on the wire; after completing the tightening, the driving component is locked to maintain the connection between the contact end and the wire; due to the elastic potential energy of the elastic segment, when the current in the three-phase power grid changes, the elastic potential energy of the elastic segment compensates for the thermal expansion deformation caused by heating and the cold contraction deformation caused by cooling, thereby ensuring the stable contact between the contact end and the wire, and ensuring the reliability and stability of the wiring point. Moreover, since the inner diameter of the No. 3 casing is a fixed value, the diameter of the wire inserted into the No. 3 casing is limited, that is, only wires that match the inner diameter of the No. 3 casing can be inserted, and no additional wires can be added. This prevents criminals from inserting additional wires into the No. 3 casing to steal electricity, thereby improving the anti-theft performance of the three-phase smart electricity meter.

[0008] Preferably, the driving assembly includes a No. 1 sleeve, a rotating shaft and a pressure spring, the No. 2 sleeve, the No. 3 sleeve, the rotating shaft and the pressure spring are all coaxially arranged in the No. 1 sleeve, the No. 3 sleeve is fixedly connected to the lower end of the inner side of the No. 1 sleeve, a plurality of limit platforms are arranged in a circular array in the middle of the inner wall of the No. 1 sleeve, and slide grooves are arranged between the plurality of limit platforms, and the guiding direction of the slide grooves is vertically downward, and a No. 1 guide surface and a No. 2 guide surface are arranged at the upper end of the limit platform, and the No. 1 guide surface and the No. 2 guide surface are both inclined surfaces and are inclined to the slide groove on one side, and a vertically downward limiting surface is arranged between the No. 1 guide surface and the No. 2 guide surface, and the No. 2 sleeve is slidably connected in the No. 3 sleeve, and a plurality of limit platforms are arranged in a circular array on the side wall of the No. 2 sleeve. A limiting hole, the limiting hole is a waist-shaped hole, the arc segment passes through the limiting hole and extends into the No. 2 sleeve, the upper outer wall of the No. 2 sleeve has a plurality of limiting protrusions in an annular array, and the plurality of limiting protrusions are respectively slidably connected in the plurality of slide grooves, the upper end surface of the No. 2 sleeve is tooth-shaped, the tooth-shaped surface is the No. 3 guide surface, the vertical projection of the limiting surface is located between the highest point and the lowest point of the No. 3 guide surface, the rotating shaft is slidably connected to the upper side of the limiting platform, the lower end annular array of the rotating shaft is provided with a plurality of sliding protrusions, the lower end surface of the sliding protrusion is an inclined surface, the upper end of the No. 1 sleeve is provided with a top cover, the top cover is fixedly connected to the body of the electric energy meter, the upper and lower ends of the pressure spring are respectively connected to the upper end surface of the rotating shaft and the lower end surface of the top cover.

[0009] When the lower end face of the sliding protrusion is in contact with the No. 1 guide surface, the pressure spring is in a compressed state, and the upper end face of the rotating shaft is acted upon by the elastic force of the pressure spring. The rotating shaft moves downward under the elastic force of the pressure spring, and relative sliding occurs between the lower end face of the sliding protrusion and the No. 1 guide surface until the sliding protrusion slides to the lowest point of the No. 1 guide surface, at which time the side face of the sliding protrusion is in contact with the limiting surface, and the sliding protrusion cannot continue to move downward due to the limiting effect of the limiting surface. At this time, under the action of gravity, the No. 2 sleeve is in a state where the upper inner wall of the limiting hole is in contact with the upper end face of the arc segment, and the elastic force of the pressure spring does not act on the No. 2 sleeve.

[0010] When wiring, insert the wire into the No. 3 sleeve. When the wire is inserted into the sleeve, the upper end surface of the wire sheath on the outside of the wire abuts against the lower end surface of the No. 2 sleeve, and continues to push the wire sheath upward. The wire sheath pushes the No. 2 sleeve to move upward, and the limiting protrusion slides in the slide groove. The upper inner wall of the limiting hole is separated from the upper end surface of the arc segment. As the No. 2 sleeve continues to move upward, the No. 3 guide surface abuts against the lower end surface of the sliding protrusion, and the upward moving wire sheath drives the rotating shaft to move upward through the No. 2 sleeve. During the process, the pressure spring is compressed, and the elastic potential energy of the pressure spring increases until the sliding protrusion The side surface is completely separated from the limit surface, the lateral restriction of the sliding protrusion is released, the rotating shaft moves downward under the pressure of the pressure spring, the sliding protrusion and the No. 3 guide surface slide relative to each other, and the rotating shaft rotates until the sliding protrusion moves downward to the lowest point of the No. 3 guide surface, and the sliding protrusion is displaced to the upper side of the No. 2 guide surface under the guidance of the No. 3 guide surface; at this time, the upward thrust acting on the thread skin is canceled, and in the process of the sliding protrusion sliding downward in the slide groove, the No. 2 sleeve is in contact with the upper inner wall of the limit hole and the upper end surface of the arc segment under the action of gravity. The spring is in a closed state; the elastic force of the pressure spring is released, and the rotating shaft moves downward under the elastic force of the pressure spring, and the lower end surface of the sliding protrusion abuts against the No. 2 guide surface. As the rotating shaft continues to move downward, the lower end surface of the sliding protrusion slides relatively with the No. 2 guide surface, and the rotating shaft rotates, and the sliding protrusion is displaced into the sliding groove under the guidance of the No. 2 guide surface, and the sliding protrusion slides to the bottom of the sliding groove under the elastic force of the pressure spring. When the sliding protrusion slides downward, the lower end surface of the sliding protrusion abuts against the No. 3 guide surface, and as the pressure spring continues to push the rotating shaft downward, The limiting protrusion slides downward in the slide groove, the No. 2 sleeve moves downward with the rotating shaft, the limiting hole and the arc segment slide, and the arc segment moves toward the inside of the No. 2 sleeve due to the squeezing of the inner wall of the limiting hole, the elastic segment undergoes elastic deformation, and the inner diameter of the contact end becomes smaller until the contact end fits with the outer wall of the wire. At this time, the wire is connected to the circuit system in the electric energy meter, and the driving component continues to drive the elastic segment to bend inward. The pressure applied by the contact end to the wire increases, further tightening the contact end to the wire; thereby, the connection between the wire and the electric energy meter body is completed.

[0011] When the wire is removed, the wire skin is pushed upward, and the wire skin pushes the No. 2 sleeve to move upward, and the limiting protrusion slides in the sliding groove, and the pressure of the limiting hole on the arc section gradually decreases, and the elastic section gradually resets under the action of its own elastic force, and the pressure between the contact end and the wire gradually decreases, until the No. 2 sleeve moves upward to a certain height, the upper inner wall of the limiting hole is separated from the upper end surface of the arc section, and the pressure applied by the limiting hole on the arc section is zero; in the process, the No. 3 guide surface and the lower end surface of the sliding protrusion are in abutment state, and the rotating shaft follows the No. 2 sleeve to move upward, and the sliding protrusion moves upward in the sliding groove, and the pressure spring is gradually compressed until the sliding protrusion completely slides out of the sliding groove, and the rotating shaft moves downward under the elastic force of the pressure spring, and the sliding protrusion moves downward and slides relatively between the No. 3 guide surface, and the rotating shaft rotates until the sliding protrusion When the guide wheel is in a state of being pressed downwardly and being pressed downwardly, the guide wheel is in a state of being pressed downwardly and being pressed downwardly, and the lower end face of the sliding protrusion is rotated to the upper side of the first guide surface; at this time, the upward thrust acting on the wire skin is cancelled, and when the lower end face of the sliding protrusion is in contact with the first guide surface, the pressure spring is in a compressed state, and the upper end face of the rotating shaft is acted upon by the elastic force of the pressure spring, and the rotating shaft moves downward under the elastic force of the pressure spring, and relative sliding occurs between the lower end face of the sliding protrusion and the first guide surface until the sliding protrusion slides to the lowest point of the first guide surface, and the side face of the sliding protrusion is in contact with the limiting surface, and the sliding protrusion cannot continue to move downward due to the limiting effect of the limiting surface, and at this time, under the action of gravity, the upper inner wall of the limiting hole of the No. 2 sleeve is in a state of being in contact with the upper end face of the arc segment, and the wire is pulled out of the No. 3 sleeve, thereby completing the release of the wire from the electric energy meter body.

[0012] Through the arrangement of the No. 1 sleeve, the rotating shaft and the pressure spring, the connection and release between the electric wire and the electric energy meter body can be completed through the above-mentioned pressing action, which simplifies the connection action between the electric wire and the electric energy meter body and helps to reduce the workload of maintenance personnel; at the same time, the driving method relies on the elastic force of the pressure spring as the pressure source between the electric wire and the contact, and the contact is provided with an elastic section, and the pressure spring and the elastic section can absorb part of the vibration energy in the environment, thereby reducing the influence of vibration on the connection between the contact end and the electric wire, ensuring the stable contact between the contact end and the electric wire, and ensuring the reliability and stability of the connection point of the three-phase smart electric energy meter.

[0013] Preferably, the limiting hole comprises a limiting section and a guiding section, the width of the limiting section is the same as that of the elastic section, the guiding section is located at the upper end of the limiting section, the guiding section is arranged to be inclined upward, and the inner end of the guiding section is higher than the outer end.

[0014] Since the arc segment bends toward the inner side of the No. 3 sleeve, the closer the arc segment is to the contact end, the higher the height is. If the limiting hole is set as a waist-shaped hole, when the No. 2 sleeve moves downward, the limiting hole preferentially contacts the side of the arc segment close to the contact end. As the No. 2 sleeve continues to move downward, the arc segment and the limiting hole slide, and the arc segment is squeezed by the limiting hole to move toward the inner side of the No. 2 sleeve. The horizontal thrust applied to the arc segment by the No. 2 sleeve gradually increases. Therefore, it is necessary to increase the stroke of the No. 2 sleeve to meet the thrust applied to the arc segment by the No. 2 sleeve to meet the locking requirements of the wire, the vertical installation space requirements are high, and the effective length requirements of the pressure spring are high. To this end, a guide section is set in the limiting hole, and the No. 2 sleeve moves downward. During movement, the outer end of the guide section preferentially abuts against the upper end surface of the arc segment, and the contact position is farther away from the contact end than the first contact position with the arc segment when the limiting hole is a waist-shaped hole. The horizontal thrust applied to the arc segment by the No. 2 sleeve is greater than the horizontal thrust applied to the arc segment when the limiting hole is a waist-shaped hole. Therefore, in the case of the same specification of pressure spring, the limiting hole with a guide section is conducive to increasing the horizontal thrust applied to the contact by the No. 2 sleeve, thereby improving the connection stability between the contact and the wire; and under the same locking condition requirements, the limiting hole with a guide section is conducive to reducing the effective length requirements of the pressure spring and the vertical installation space requirements, which is convenient for maintenance personnel to push the No. 2 sleeve, and is also conducive to reducing the length of the No. 1 sleeve and the electric energy meter body.

[0015] Preferably, a plurality of avoidance holes are provided in a circular array on the outer wall of the No. 1 casing, the plurality of avoidance holes are all waist-shaped holes, and the plurality of elastic sections extend into the avoidance holes, heat dissipation holes are provided between adjacent limiting holes, ventilation holes are provided between adjacent avoidance holes, and the avoidance holes and the ventilation holes completely penetrate the inner side of the No. 2 casing and the outer side of the No. 1 casing.

[0016] When the electric energy meter body is working, due to the current between the wire and the contact, high temperature is likely to be generated in the No. 3 bushing after long-term operation. In order to avoid the excessive temperature between the No. 3 bushing and the wire causing damage to the contact end or fire; therefore, ventilation holes and heat dissipation holes are respectively provided on the No. 1 bushing and the No. 2 bushing, the heat generated between the contact end and the wire is discharged out of the No. 1 bushing through the ventilation holes and the heat dissipation holes, thereby reducing the risk of damage to the contact end and fire caused by excessive temperature of the contact end and the wire; at the same time, by An avoidance hole is provided. On the one hand, when the contact on the No. 3 sleeve bends outward, the avoidance hole can provide a movable space for the contact, which is convenient for the installation of the No. 3 sleeve and the No. 2 sleeve. On the other hand, when the temperature is generated between the contact and the wire due to the current, the temperature on the contact can be discharged outside the No. 1 sleeve not only through the heat dissipation holes and the ventilation holes, but also through the avoidance hole, so as to avoid irreversible deformation of the contact due to excessive temperature, thereby ensuring the elasticity of the elastic section, ensuring the stable contact between the contact end and the wire, and ensuring the safety and stability of the wiring point.

[0017] Preferably, mounting holes are provided in a circular array on the outer wall of the No. 1 sleeve, central axes of the plurality of mounting holes are perpendicular to the central axis of the No. 1 sleeve, magnetic blocks are installed in the plurality of mounting holes, and the upper side of the No. 2 sleeve is made of magnetic material.

[0018] When the wire is removed, the sliding protrusion slides to the lowest point of the No. 1 guide surface, and the side surface of the sliding protrusion is in contact with the limiting surface. The sliding protrusion cannot continue to move downward due to the limiting effect of the limiting surface and the No. 1 guide surface, and the No. 2 sleeve is in a state where the upper inner wall of the limiting hole and the upper end surface of the arc segment are in contact under the action of gravity. The gravity of the No. 2 sleeve acts on the arc segment, and there is a horizontal component of force under the gravity of the No. 2 sleeve on the arc segment. The contact has a clamping force on the wire, which is not conducive to pulling the wire out of the No. 3 sleeve; for this reason, a magnetic block is arranged on the side wall of the No. 1 sleeve, and when the limiting effect of the limiting surface of the sliding protrusion and the No. 1 guide surface cannot continue to move downward, the No. 2 sleeve cannot continue to move downward under the action of the magnetic attraction, which prevents the No. 2 sleeve from falling to the limiting hole and abutting the arc segment under the action of gravity, thereby facilitating the pulling of the wire out of the No. 3 sleeve.

[0019] Preferably, a pressure ring is provided at the lower end of the No. 3 casing, and the pressure ring includes a connecting section and a deformation section. The connecting section is annular and fixedly connected to the No. 3 casing. The deformation section is located on the inner side of the connecting section, and the deformation section is composed of a plurality of annularly arranged spring pieces, and the deformation section is in an upwardly protruding cone shape. The upper ends of the plurality of spring pieces are provided with guide bosses, and the guide bosses extend to the upper side of the deformation section, and the plurality of guide bosses are all located between the inner side of the No. 2 casing and the inner side of the No. 3 casing.

[0020] When wiring, the No. 2 sleeve moves upward under the spring force of the pressure spring, and the arc segment moves toward the inside of the No. 2 sleeve due to the squeezing of the inner wall of the limiting hole, and the inner diameter of the contact end becomes smaller, exerting pressure on the wire and clamping and constraining the wire. Although the connection between the contact and the wire can be achieved, there is an upper limit to the friction between the contact end and the wire. When the wire is subjected to a vertical downward pulling force, it is easy to cause sliding friction between the contact end and the wire, and even cause the wire to separate from the contact end. For this reason, a pressure ring is provided at the lower end of the No. 3 sleeve. When the No. 2 sleeve moves upward under the elastic force of the pressure spring, the lower end of the No. 2 sleeve abuts against the upper end face of the guide boss, and the No. 2 sleeve continues to move downward Movement, the No. 2 sleeve pushes the spring sheet to bend downward through the guide boss, the inner diameters of the multiple spring sheets become smaller, the inner ends of the spring sheets first fit with the outer wall of the wire skin included on the outside of the wire, the wire skin is usually made of elastic material, as the No. 2 sleeve continues to move downward, the inner end of the spring sheet squeezes the wire skin and embeds into the wire skin, and when the wire skin and the wire are subjected to a vertical downward pulling force, the spring sheet continues to bend downward, the smaller the inner diameters of the multiple spring sheets, the greater the squeezing force of the spring sheet on the wire skin, thereby the stronger the vertical pulling force on the wire skin, thereby preventing the wire from being separated from the contact end when the wire skin and the wire are subjected to a vertical downward pulling force, thereby ensuring stable contact between the contact end and the wire, and ensuring the reliability and stability of the wiring connection.

[0021] Preferably, the minimum diameter of the contact end is D1, the diameter of the wire is D2, D1=D2-(0.2-1.0) mm, and the inner side of the lower end of the contact end is chamfered.

[0022] When wiring, the wire is pushed upward until the lower end of the sliding protrusion is displaced to the upper side of the No. 2 guide surface, and the upward thrust acting on the wire skin is cancelled. At this time, there is no clamping force between the contact and the wire, and the wire is easy to move downward under the action of gravity and slide out of the No. 3 sleeve. If the maintenance personnel holds the wire and waits for the pressure spring to push the rotating shaft and the No. 2 sleeve downward, the maintenance personnel will need to wait for a long time; for this reason, by setting the minimum diameter D1 of the contact end and the diameter D2 of the wire to D1=D2-(0.2~1.0)mm, when the maintenance personnel inserts the wire into the No. 3 sleeve, there is a clamping force and friction force between the wire and the contact, which prevents the wire from sliding out of the No. 3 sleeve under the action of gravity when the maintenance personnel finishes applying the upward thrust on the wire, which is convenient for the maintenance personnel to construct; at the same time, even if the contact is not affected by the squeezing force of the No. 2 sleeve, the contact end and the wire are still in contact, ensuring the stable contact between the contact end and the wire, and ensuring the reliability and stability of the wiring point.

[0023] Preferably, the No. 1 bushing, the No. 2 bushing and the pressure ring are all made of any insulating flame-retardant material including PVC, PI, PC, PET or PPS; thereby further ensuring the safety of the three-phase smart energy meter.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1. The present invention provides a No. 3 bushing, a No. 2 bushing and a driving assembly, and at the same time provides a contact with an elastic section on the No. 3 bushing. When the No. 2 bushing moves downward under the driving action of the driving assembly, it squeezes the contact to clamp the wire, thereby realizing the connection between the wire and the electric energy meter body, simplifying the wiring process, and at the same time, the elastic potential energy of the elastic section compensates for the thermal expansion deformation caused by heating and the cold contraction deformation caused by cooling, thereby ensuring the stable contact between the contact and the wire, and ensuring the reliability and stability of the wiring point.

[0026] 2. The present invention provides ventilation holes and avoidance holes on the No. 1 sleeve, and heat dissipation holes on the No. 2 sleeve. The temperature on the contact can be discharged out of the No. 1 sleeve not only through the heat dissipation holes and the ventilation holes, but also through the avoidance holes. This reduces the risk of damage to the contact end and fire caused by excessive temperatures of the contact end and the wire, and avoids irreversible deformation of the contact due to excessive temperature, thereby ensuring the elasticity of the elastic section, ensuring stable contact between the contact end and the wire, and ensuring the safety and stability of the wiring point.

[0027] 3. The present invention arranges a pressure ring at the lower end of the No. 3 sleeve. When the No. 2 sleeve moves upward under the elastic force of the pressure spring, the No. 2 sleeve pushes the spring sheet to bend downward through the guide boss. The inner diameters of the inner ends of the multiple spring sheets become smaller and are embedded in the wire sheath. When the wire sheath and the wire are subjected to a vertical downward pulling force, the spring sheets continue to bend downward. The smaller the inner diameters of the multiple spring sheets, the greater the squeezing force of the spring sheets on the wire sheath, thereby the stronger the vertical pulling force on the wire sheath, thereby preventing the wire from being separated from the contact end when the wire sheath and the wire are subjected to a vertical downward pulling force, thereby ensuring stable contact between the contact end and the wire, and ensuring the reliability and stability of the wiring connection. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the overall structure of the three-phase intelligent electric energy meter of the present invention;

[0029] Figure 2 It is an exploded view of the three-phase smart electric energy meter of the present invention;

[0030] Figure 3 An exploded view of the wiring structure of the three-phase smart electric energy meter of the present invention;

[0031] Figure 4 It is a cross-sectional view of a No. 1 bushing in the three-phase intelligent electric energy meter of the present invention;

[0032] Figure 5 It is a schematic diagram of the overall structure of the wiring structure of the three-phase intelligent electric energy meter of the present invention;

[0033] Figure 6 for Figure 5 Sectional view at AA in the figure;

[0034] Figure 7 This is a state diagram when the sliding protrusion is completely separated from the limiting surface during wiring;

[0035] Figure 8 This is a diagram showing the status of the wires being connected to the electric energy meter body.

[0036] In the figure: 1, electric energy meter body; 101, wiring area; 2, insulation cover; 3, No. 1 bushing; 301, limit table; 3011, No. 1 guide surface; 3012, No. 2 guide surface; 3013, limit surface; 302, slide groove; 303, avoidance hole; 304, ventilation hole; 305, installation hole; 4, No. 2 bushing; 401, limit protrusion; 402, No. 3 guide surface; 403, limit hole; 4031, limit Position section; 4032, guide section; 404, heat dissipation hole; 5, No. 3 sleeve; 501, contact; 5011, elastic section; 5012, arc section; 5013, contact end; 502, terminal head; 6, rotating shaft; 601, sliding protrusion; 7, pressing ring; 701, connecting section; 702, spring; 7021, pilot boss; 8, pressure spring; 9, top cover; 10, magnet; 11, electric wire; 12, wire skin. DETAILED DESCRIPTION

[0037] See also Figures 1 to 8 The present invention provides a three-phase intelligent electric energy meter, and the technical solution is as follows:

[0038] See also Figures 1 to 3 , Figure 5 and Figure 6A three-phase intelligent electric energy meter comprises an electric energy meter body 1 and an insulating cover 2. A wiring area 101 is provided at the lower side of the front end of the electric energy meter body 1. The insulating cover 2 can be detachably installed at the front end of the wiring area 101. A No. 3 bushing 5 is provided in the wiring area 101. The No. 3 bushing 5 is made of C7025 material. A wiring head 502 is provided at the lower end of the No. 3 bushing 5. The wiring head 502 is electrically connected to the circuit system in the electric energy meter body 1. Five contacts 501 are provided in a circular array at the upper end of the No. 3 bushing 5. The contact 501 comprises an elastic section 5011, an arc section 5012 and a contact end 501. 3. The elastic section 5011 extends out of the upper side of the No. 3 sleeve 5. The arc section 5012 is located at the upper end of the elastic section 5011. The arc section 5012 bends toward the inner side of the No. 3 sleeve 5. The inner side of the arc section 5012 is the contact end 5013. The No. 2 sleeve 4 is coaxially slidably connected in the No. 3 sleeve 5. A plurality of limiting holes 403 are provided in an annular array on the side wall of the No. 2 sleeve 4. The limiting holes 403 are waist-shaped holes. The arc section 5012 passes through the limiting holes 403 and extends into the No. 2 sleeve 4. A driving component for driving the No. 2 sleeve 4 to move downward is provided on the upper side of the No. 2 sleeve 4.

[0039] For details, please refer to Figure 3 and Figure 4The driving assembly includes a No. 1 sleeve 3, a rotating shaft 6 and a pressure spring 8. The No. 2 sleeve 4, the No. 3 sleeve 5, the rotating shaft 6 and the pressure spring 8 are all coaxially arranged in the No. 1 sleeve 3. The No. 3 sleeve 5 is fixedly connected to the lower end of the inner side of the No. 1 sleeve 3. A plurality of limit platforms 301 are arranged in a circular array in the middle of the inner wall of the No. 1 sleeve 3. A slide groove 302 is arranged between the plurality of limit platforms 301. The guiding direction of the slide groove 302 is vertically downward. A No. 1 guide surface 3011 and a No. 2 guide surface 3012 are arranged at the upper end of the limit platform 301. Both the No. 1 guide surface 3011 and the No. 2 guide surface 3012 are inclined surfaces and are inclined to the slide groove 302 on one side. A vertical downward guide groove 302 is arranged between the No. 1 guide surface 3011 and the No. 2 guide surface 3012. The limiting surface 3013, the second sleeve 4 is slidably connected to the third sleeve 5, and the side wall of the second sleeve 4 is provided with 5 limiting holes 403 in an annular array, the limiting holes 403 are waist-shaped holes, the limiting holes 403 include a limiting section 4031 and a guide section 4032, the width of the limiting section 4031 is the same as the width of the elastic section 5011, the guide section 4032 is located at the upper end of the limiting section 4031, the guide section 4032 is inclined upward, and the inner end of the guide section 4032 is higher than the outer end, and heat dissipation holes 404 are provided between adjacent limiting holes 403, and the heat dissipation holes 404 completely penetrate the inner and outer sides of the second sleeve 4; the outer wall of the first sleeve 3 is provided with 5 avoidance holes 303 in an annular array, and the five avoidance holes 3 03 are all waist-shaped holes, and the five elastic sections 5011 extend into the avoidance hole 303. Ventilation holes 304 are provided between adjacent avoidance holes 303. The avoidance holes 303 and the ventilation holes 304 completely penetrate the inner and outer sides of the No. 1 sleeve 3; the arc section 5012 passes through the limiting hole 403 and extends into the No. 2 sleeve 4. The upper outer wall of the No. 2 sleeve 4 has 5 limiting protrusions 401 in a circular array. The five limiting protrusions 401 are respectively slidably connected in the five sliding grooves 302. The upper end face of the No. 2 sleeve 4 is toothed, and the toothed surface is the No. 3 guide surface 402. The rotating shaft 6 is slidably connected to the upper side of the limiting platform 301. The lower end ring array of the rotating shaft 6 is provided with 5 sliding protrusions 601. The lower end face of the sliding protrusion 601 is inclined A top cover 9 is provided at the upper end of the No. 1 bushing 3, and the top cover 9 is fixedly connected to the body of the electric energy meter. The upper and lower ends of the pressure spring 8 are respectively connected to the upper end surface of the rotating shaft 6 and the lower end surface of the top cover 9; a pressure ring 7 is provided at the lower end of the No. 3 bushing 5, and the pressure ring 7 includes a connecting section 701 and a deformation section. The connecting section 701 is annular and fixedly connected to the No. 3 bushing 5. The deformation section is located on the inner side of the connecting section 701, and the deformation section is composed of a plurality of annularly arranged spring pieces 702. The deformation section is in an upwardly protruding cone shape. A pilot boss 7021 is provided at the upper end of the plurality of spring pieces 702. The pilot boss 7021 extends to the upper side of the deformation section, and the plurality of pilot bosses 7021 are all located between the inner side of the No. 2 bushing 4 and the inner side of the No. 3 bushing 5.

[0040] For further information, see Figure 3 , Figure 5 and Figure 6 Five mounting holes 305 are provided in a circular array on the outer wall of the No. 1 sleeve 3, and the central axes of the five mounting holes 305 are perpendicular to the central axis of the No. 1 sleeve 3. Magnetic blocks 10 are installed in the five mounting holes 305, and the upper side of the No. 2 sleeve 4 is made of magnetic material.

[0041] It should be noted that the three-phase smart energy meter in this specific embodiment is used in a three-phase circuit with medium load, and the wire 11 is 16mm 2 The copper wire has a minimum diameter of 4 mm at the contact end 5013, and the No. 1 sleeve 3, the No. 2 sleeve 4 and the pressure ring 7 are all made of PVC material.

[0042] Please refer to 1 to Figure 6 When the lower end surface of the sliding protrusion 601 is in contact with the No. 1 guide surface 3011, the pressure spring 8 is in a compressed state, and the upper end surface of the rotating shaft 6 is acted upon by the elastic force of the pressure spring 8. The rotating shaft 6 moves downward under the elastic force of the pressure spring 8, as the lower end surface of the sliding protrusion 601 and the No. 1 guide surface 3011 slide relative to each other, until the sliding protrusion 601 slides to the lowest point of the No. 1 guide surface 3011, the side surface of the sliding protrusion 601 is in contact with the limiting surface 3013, and the sliding protrusion 601 cannot continue to move downward due to the limiting effect of the limiting surface 3013. At this time, under the action of gravity, the No. 2 sleeve 4 is in a state where the upper inner wall of the limiting hole 403 is in contact with the upper end surface of the arc segment 5012, and the elastic force of the pressure spring 8 does not act on the No. 2 sleeve 4.

[0043] See also Figures 6 to 8When wiring, insert the wire 11 into the No. 3 sleeve 5. When the wire 11 is inserted into the sleeve, the upper end surface of the wire sheath 12 outside the wire 11 abuts against the lower end surface of the No. 2 sleeve 4, and continues to push the wire sheath 12 upward. The wire sheath 12 pushes the No. 2 sleeve 4 to move upward, and the limiting protrusion 401 slides in the slide groove 302. The upper inner wall of the limiting hole 403 is separated from the upper end surface of the arc segment 5012. As the No. 2 sleeve 4 continues to move upward, the No. 3 guide surface 402 abuts against the lower end surface of the sliding protrusion 601. The wire sheath 12 moving upward drives the rotating shaft 6 to move upward through the No. 2 sleeve 4. During the process, the pressure spring 8 is compressed, and the elastic potential energy of the pressure spring 8 increases until the sliding protrusion 6 The side of No. 01 is completely separated from the limiting surface 3013, the lateral restriction of the sliding protrusion 601 is released, the shaft 6 moves downward under the pressure of the pressure spring 8, the sliding protrusion 601 and the third guide surface 402 slide relative to each other, and the shaft 6 rotates until the sliding protrusion 601 moves downward to the lowest point of the third guide surface 402, and the sliding protrusion 601 is displaced to the upper side of the second guide surface 3012 under the guidance of the third guide surface 402; at this time, the upward thrust acting on the thread skin 12 is canceled, and in the process of the sliding protrusion 601 sliding downward in the slide groove 302, the second sleeve 4 is located between the upper inner wall of the limiting hole 403 and the arc segment 5 under the action of gravity. 012 is in a state of being in contact with the upper end surface of 012; the elastic force of the pressure spring 8 is released, and the rotating shaft 6 moves downward under the elastic force of the pressure spring 8, and the lower end surface of the sliding protrusion 601 abuts against the No. 2 guide surface 3012. As the rotating shaft 6 continues to descend, the lower end surface of the sliding protrusion 601 slides relatively with the No. 2 guide surface 3012, and the rotating shaft 6 rotates. The sliding protrusion 601 is displaced into the slide groove 302 under the guidance of the No. 2 guide surface 3012, and the sliding protrusion 601 slides to the bottom of the slide groove 302 under the elastic force of the pressure spring 8. When the sliding protrusion 601 slides downward, the lower end surface of the sliding protrusion 601 abuts against the No. 3 guide surface 402. As the pressure spring 8 continues to The rotating shaft 6 is pushed down, and the limiting protrusion 401 slides downward in the slide groove 302. The No. 2 sleeve 4 moves downward with the rotating shaft 6. The limiting hole 403 and the arc segment 5012 slide. The arc segment 5012 moves toward the inside of the No. 2 sleeve 4 due to the squeezing of the inner wall of the limiting hole 403. The elastic segment 5011 is elastically deformed, and the inner diameter of the contact end 5013 becomes smaller until the contact end 5013 fits with the outer wall of the wire 11. At this time, the wire 11 is connected to the circuit system in the electric energy meter, and the driving component continues to drive the elastic segment 5011 to bend inward. The pressure applied to the wire 11 by the contact end 5013 increases, further tightening the constraint of the contact end 5013 on the wire 11.

[0044] When the second sleeve 4 moves upward under the elastic force of the pressure spring 8, the lower end of the second sleeve 4 abuts against the upper end surface of the guide boss 7021, and the second sleeve 4 continues to move downward. The second sleeve 4 pushes the spring piece 702 to bend downward through the guide boss 7021, and the inner diameters of the plurality of spring pieces 702 become smaller. The inner ends of the spring pieces 702 first fit with the outer wall of the wire sheath 12 included on the outside of the wire 11. The wire sheath 12 is usually made of elastic material. As the second sleeve 4 continues to move upward, the spring piece 702 is pushed downward by the guide boss 7021. The spring piece 702 moves downward, and the inner end of the spring piece 702 squeezes the wire sheath 12 and embeds into the wire sheath 12; after the contact end 5013 completes the constraint on the wire 11, the maintenance personnel pulls the wire sheath 12 again. When the wire sheath 12 and the wire 11 are subjected to the vertical downward pulling force, the spring piece 702 continues to bend downward. The smaller the inner diameter of the multiple spring pieces 702, the greater the squeezing force of the spring piece 702 on the wire sheath 12, and thus the stronger the vertical pulling force on the wire sheath 12; thereby, the connection between the wire 11 and the electric energy meter body 1 is completed.

[0045] When the wire is removed, the wire cover 12 is pushed upward, and the wire cover 12 pushes the second sleeve 4 to move upward, the limiting protrusion 401 slides in the slide groove 302, the pressure of the limiting hole 403 on the arc segment 5012 gradually decreases, and the elastic segment 5011 gradually returns to its original position under the action of its own elastic force, and the pressure between the contact end 5013 and the wire 11 gradually decreases, until the second sleeve 4 moves upward to a certain height, the upper inner wall of the limiting hole 403 is separated from the upper end surface of the arc segment 5012, and the limiting hole 403 exerts pressure on the arc segment 5 012 is zero; during the process, the third guide surface 402 is in contact with the lower end surface of the sliding protrusion 601, the rotating shaft 6 moves upward with the second sleeve 4, the sliding protrusion 601 moves upward in the sliding groove 302, the pressure spring 8 is gradually compressed, until the sliding protrusion 601 completely slides out of the sliding groove 302, the rotating shaft 6 moves downward under the elastic force of the pressure spring 8, the sliding protrusion 601 moves downward and slides relatively with the third guide surface 402, the rotating shaft 6 rotates, until the sliding protrusion 601 is completely slid out of the sliding groove 302, and the rotating shaft 6 moves downward. The lower end surface of the sliding protrusion 601 slides to the lowest point of the No. 3 guide surface 402, the rotating shaft 6 stops moving downward and rotating, and the lower end surface of the sliding protrusion 601 rotates to the upper side of the No. 1 guide surface 3011; at this time, the upward thrust acting on the thread skin 12 is cancelled, and when the lower end surface of the sliding protrusion 601 is in contact with the No. 1 guide surface 3011, the pressure spring 8 is in a compressed state, and the upper end surface of the rotating shaft 6 is acted upon by the elastic force of the pressure spring 8. The rotating shaft 6 moves downward under the elastic force of the pressure spring 8, and as the sliding protrusion 601 moves downward, There is relative sliding between the lower end surface of the protrusion 601 and the No. 1 guide surface 3011 until the sliding protrusion 601 slides to the lowest point of the No. 1 guide surface 3011, and the side surface of the sliding protrusion 601 fits with the limiting surface 3013, and the sliding protrusion 601 cannot continue to move downward due to the limiting effect of the limiting surface 3013. At this time, the No. 2 sleeve 4 cannot continue to move downward due to the magnetic attraction of the magnetic block 10, and the wire 11 is pulled out of the No. 3 sleeve 5, thereby completing the release of the wire 11 from the electric energy meter body 1.

[0046] A specific embodiment of the present invention is described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above described embodiment. For those skilled in the art, various changes, modifications, substitutions and variations of these embodiments without departing from the principles and ideas of the present invention should still fall within the scope of protection of the present invention.

Claims

1. A three-phase intelligent electric energy meter, comprising an electric energy meter body (1) and an insulating cover (2), wherein a wiring area (101) is provided at the lower side of the front end of the electric energy meter body (1), and the insulating cover (2) is detachably mounted on the front end of the wiring area (101), characterized in that: A No. 3 bushing (5) is provided in the wiring area (101), the No. 3 bushing (5) is made of a conductive material, a wiring head (502) is provided at the lower end of the No. 3 bushing (5), the wiring head (502) is electrically connected to the circuit system in the electric energy meter body (1), a plurality of contacts (501) are provided in a circular array at the upper end of the No. 3 bushing (5), the contacts (501) include an elastic section (5011), an arc section (5012) and a contact end (5013), the elastic section (5011) extends out of the upper side of the No. 3 bushing (5), the arc section (5012) is located at the elastic section (5011) and the contact end (5013) is provided at the elastic section (5011). The arc segment (5012) is at the upper end of the sex section (5011), and is bent toward the inner side of the third sleeve (5). The inner side of the arc segment (5012) is a contact end (5013). The third sleeve (5) is coaxially slidably connected with the second sleeve (4). A plurality of limiting holes (403) are arranged in an annular array on the side wall of the second sleeve (4). The limiting holes (403) are waist-shaped holes. The arc segment (5012) passes through the limiting holes (403) and extends into the second sleeve (4). A driving component for driving the second sleeve (4) to move downward is provided on the upper side of the second sleeve (4).

2. A three-phase smart energy meter according to claim 1, characterized in that: The driving assembly comprises a No. 1 sleeve (3), a rotating shaft (6) and a pressure spring (8); the No. 2 sleeve (4), the No. 3 sleeve (5), the rotating shaft (6) and the pressure spring (8) are all coaxially arranged in the No. 1 sleeve (3); the No. 3 sleeve (5) is fixedly connected to the lower end of the inner side of the No. 1 sleeve (3); a plurality of limit platforms (301) are arranged in a circular array in the middle of the inner wall of the No. 1 sleeve (3); and the plurality of limit platforms (301) are arranged between the plurality of limit platforms (301). A slide groove (302) is provided, the guiding direction of the slide groove (302) is vertically downward, a first guide surface (3011) and a second guide surface (3012) are provided at the upper end of the limiting platform (301), the first guide surface (3011) and the second guide surface (3012) are both inclined surfaces, and are inclined toward the slide groove (302) on one side, and a vertical guide surface (3011) and a second guide surface (3012) are provided between the first guide surface (3011) and the second guide surface (3012). The second sleeve (4) has a plurality of limiting protrusions (401) in an annular array on the outer wall of the upper end, and the plurality of limiting protrusions (401) are respectively slidably connected in the plurality of slide grooves (302). The upper end surface of the second sleeve (4) is tooth-shaped, and the tooth-shaped surface is the third guide surface (402). The vertical projection of the limiting surface (3013) is located between the highest point and the lowest point of the third guide surface (402). The rotating shaft (6) is slidably connected to the upper side of the limit platform (301); a plurality of sliding protrusions (601) are provided in a circular array at the lower end of the rotating shaft (6); the lower end surface of the sliding protrusion (601) is an inclined surface; a top cover (9) is provided at the upper end of the No. 1 sleeve (3); the top cover (9) is fixedly connected to the body of the electric energy meter; and the upper and lower ends of the pressure spring (8) are respectively connected to the upper end surface of the rotating shaft (6) and the lower end surface of the top cover (9).

3. A three-phase smart energy meter according to claim 2, characterized in that: The limiting hole (403) comprises a limiting section (4031) and a guiding section (4032); the width of the limiting section (4031) is the same as the width of the elastic section (5011); the guiding section (4032) is located at the upper end of the limiting section (4031); the guiding section (4032) is arranged to be inclined upward, and the inner end of the guiding section (4032) is higher than the outer end.

4. A three-phase smart energy meter according to claim 2, characterized in that: A plurality of avoidance holes (303) are provided in a circular array on the outer wall of the No. 1 sleeve (3), and the plurality of avoidance holes (303) are all waist-shaped holes, and the plurality of elastic sections (5011) extend into the avoidance holes (303), heat dissipation holes (404) are provided between adjacent limiting holes (403), and ventilation holes (304) are provided between adjacent avoidance holes (303), and the avoidance holes (303) and the ventilation holes (304) completely penetrate the inner side of the No. 2 sleeve (4) and the outer side of the No. 1 sleeve (3).

5. A three-phase smart energy meter according to claim 2, characterized in that: The outer wall of the No. 1 sleeve (3) is provided with mounting holes (305) in a circular array, the central axes of the plurality of mounting holes (305) are perpendicular to the central axis of the No. 1 sleeve (3), and magnetic blocks (10) are installed in the plurality of mounting holes (305). The upper side of the No. 2 sleeve (4) is made of magnetic material.

6. A three-phase smart energy meter according to claim 2, characterized in that: A pressure ring (7) is provided at the lower end of the No. 3 sleeve (5), and the pressure ring (7) comprises a connecting section (701) and a deformation section. The connecting section (701) is annular and fixedly connected to the No. 3 sleeve (5). The deformation section is located on the inner side of the connecting section (701), and the deformation section is composed of a plurality of annularly arranged spring sheets (702). The deformation section is in an upwardly protruding cone shape. The upper ends of the plurality of spring sheets (702) are provided with guide bosses (7021), and the guide bosses (7021) extend to the upper side of the deformation section. The plurality of guide bosses (7021) are all located between the inner side of the No. 2 sleeve (4) and the inner side of the No. 3 sleeve (5).

7. A three-phase smart energy meter according to claim 1, characterized in that: The minimum diameter of the contact end (5013) is D1, the diameter of the wire (11) is D2, D1=D2-(0.2-1.0) mm, and the inner side of the lower end of the contact end (5013) is chamfered.

8. A three-phase smart energy meter according to claim 6, characterized in that: The No. 1 sleeve (3), the No. 2 sleeve (4) and the pressure ring (7) are all made of any insulating flame-retardant material including PVC, PI, PC, PET or PPS.

Images