A three-phase electric energy meter

Abstract

The present invention relates to the field of electric energy meters, and specifically to a three-phase electric energy meter. It includes a case and a magnetic latching relay encapsulated inside the case, the magnetic latching relay includes a housing, a first wiring board and a second wiring board, an intermediate plate group, a transmission component and a magnetic control component, a static main contact is arranged on the first wiring board, a static auxiliary contact is arranged on the second wiring board, a moving main contact and a static auxiliary contact are arranged on the intermediate plate group, the moving auxiliary contact is initially in contact with the static auxiliary contact, and a knocking structure is arranged on the transmission component. The present invention uses a magnetic latching relay on-off circuit, when the static main contact and the moving main contact are welded, the static auxiliary contact and the moving auxiliary contact can still disconnect the circuit, improve the convenience of use of the device, and extend the service life of the equipment. Further, by setting a knocking structure, the welded static main contact and the moving main contact can be knocked, which helps to separate the two, so that they can continue to normally disconnect or connect the circuit, further extending the service life of the equipment.

Description

Technical Field

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

[0002] The three-phase electric energy meter is an instrument used to measure electric energy, also known as an electric meter, a fire meter, an electric energy meter, and a kilowatt-hour meter. An electromagnetic relay is installed in the three-phase electric energy meter to realize the on-off control of the circuit. The conventional electromagnetic relay has a simple structure, but the coil needs to be energized for a long time to maintain the closed state of the contacts, which is easy to cause waste of electric energy. In order to improve the above problems, there is a magnetic latching relay in the related art to replace the conventional electromagnetic relay. For example, the electric energy meter disclosed in the authorization announcement number CN 205049627 U is embedded with a magnetic latching relay. The patent document with the application publication number CN 117393382 A discloses a magnetic latching relay. When switching the circuit state, the magnetic latching relay only needs to pass a momentary weak current signal into the coil to change the polarity of the internal coil, and use a seesaw switch to switch the circuit state. The coil does not need to be energized for a long time. It not only saves power during use, but also has high reliability. However, after long-term use, the moving and static contacts of the magnetic latching relay are prone to high-temperature welding. In the case of welding, the moving and static contacts are bonded and cannot be separated, which will greatly affect the normal operation of the relay.

[0003] The information disclosed in the background technology section of the present invention is only intended to deepen the understanding of the general background technology of the present invention, and should not be regarded as acknowledging or suggesting in any form that the information constitutes the prior art already known to those skilled in the art. Summary of the invention

[0004] According to the shortcomings of the prior art, the present invention proposes a three-phase electric energy meter to solve the problem that the contacts of the magnetic latching relay in the prior electric energy meter are easy to be welded and have a short service life.

[0005] A three-phase electric energy meter of the present invention adopts the following technical solution: it comprises a meter case and a magnetic latching relay, wherein the magnetic latching relay is encapsulated inside the meter case; the magnetic latching relay comprises:

[0006] case;

[0007] A first wiring board and a second wiring board, one end of the first wiring board and the second wiring board are located inside the housing and the other end is located outside the housing, the end of the first wiring board located inside the housing is provided with a static main contact; the end of the second wiring board located inside the housing is provided with a static auxiliary contact;

[0008] The intermediate plate group includes a main breaking plate and a sub-breaking plate, both ends of the sub-breaking plate are fixedly connected to the housing, a moving sub-contact is arranged on the sub-breaking plate, and the moving sub-contact is initially in contact with the static sub-contact, the main breaking plate is arranged above the sub-breaking plate and one end away from the static sub-contact is fixedly connected to the sub-breaking plate, the main breaking plate is elastic, and a moving main contact is arranged on the main breaking plate, and the moving main contact can be in contact with or separated from the static main contact;

[0009] A transmission assembly, which acts on the main disconnecting plate and the second terminal block, is configured to drive the main disconnecting plate to move so that the moving main contact contacts or separates from the static main contact, and is configured to drive the second terminal block to move so that the static auxiliary contact separates from the moving auxiliary contact when the static main contact and the moving main contact are bonded to cut off the circuit;

[0010] A magnetic control assembly configured to control the action of the transmission assembly so that the transmission assembly acts on the main disconnecting plate and the second wiring board to control the on and off of the circuit;

[0011] A knocking structure is provided on the transmission component, and the knocking structure is configured to knock the bonding points of the static main contact and the moving main contact when the static main contact and the moving main contact are welded, so that the bonded static main contact and the moving main contact are separated.

[0012] Optionally, the magnetron assembly includes an iron core, a coil and a rotating block; the iron core is arranged at the bottom of the shell, the coil is wound around the outside of the iron core, the rotating block is rotatably arranged in the middle of the shell and acts on the transmission assembly to control the movement of the transmission assembly, and both ends of the iron core are provided with matching blocks pointing to the rotating block, and the matching blocks are made of ferromagnetic material;

[0013] The rotating block is in an I-shaped structure, and an overhanging plate is formed on the upper left and lower left, and the upper right and lower right. Each matching block is located between the two overhanging plates on the corresponding side. The rotating block is magnetic, and the upper end is a magnetic pole and the lower end is another magnetic pole.

[0014] Optionally, the transmission assembly includes a telescopic rod, the telescopic rod includes a telescopic inner rod and a telescopic outer rod which are slidably sleeved, a second chamber is formed between the telescopic inner rod and the telescopic outer rod, and in an initial state, the telescopic rod can remain in a shortened state;

[0015] The bottom of the telescopic outer rod is hinged to the rotating block, and the telescopic inner rod is connected to the main dividing plate to drive the main dividing plate to move;

[0016] A bellows is provided on the lower surface of the inner end of the second terminal block, the upper end of the bellows is connected to the lower surface of the second terminal block, the lower end of the bellows is connected to the shell, the bellows corresponds to the position of the static auxiliary contact, a first chamber is formed inside the bellows, the first chamber is connected to the second chamber, the bellows can be extended and retracted, and the part of the inner end of the second terminal block where the corrugated plate is installed can be deformed.

[0017] Optionally, an elastic member is connected between the telescopic inner rod and the telescopic outer rod, and the elastic member causes the telescopic inner rod and the telescopic outer rod to tend to approach each other.

[0018] Optionally, a connecting rod is provided on the upper surface of the rotating block, the connecting rod is located on one side of the rotating block and extends obliquely upward, and the transmission rod is located on one side of the rotation center of the rotating block and is hinged to the connecting rod.

[0019] Optionally, a connecting block is provided on the telescopic inner rod, the connecting block includes an upper block and a lower block, the upper block and the lower block are spaced apart from each other, and the free end of the main dividing plate is sleeved on the telescopic inner rod and located between the upper block and the lower block.

[0020] Optionally, the second terminal block includes a main board body and a deformation plate arranged at the inner end of the main board body, the thickness of the deformation plate is less than the thickness of the main board body, the bellows is arranged on the lower surface of the deformation plate, and the connection position of the second terminal block and the shell is located at the junction of the main board body and the deformation plate and is facing one side of the main board body.

[0021] Optionally, the striking assembly includes a control screw, a rotating cap and a striking rod;

[0022] The adjusting screw is coaxially slidably inserted into the telescopic inner rod and the lower end is connected to the telescopic outer rod;

[0023] The rotating cap is rotatably arranged on the upper end of the telescopic inner rod and is spirally connected with the adjusting screw, and a column is arranged on the upper surface of the rotating cap;

[0024] The impact rod is located above the rotating cap and points to the junction of the static main contact and the moving main contact. The impact rod can move along the radial direction of the rotating cap. A guide block is provided on the side of the impact rod away from the static main contact and the moving main contact. A straight slot running through the guide block is provided, and the column is slidably arranged in the straight slot.

[0025] Optionally, a limit plate is provided on the telescopic inner rod, the limit plate extends vertically, a guide slot is provided inside the limit plate, the guide slot is parallel to the axis of the telescopic inner rod and the slot width is adapted to the diameter of the impact rod, and the impact rod is slidably arranged in the guide slot.

[0026] Optionally, a cover plate is provided on the shell, and the cover plate is detachably connected to the shell.

[0027] The beneficial effects of the present invention are as follows: a three-phase electric energy meter of the present invention uses a magnetic latching relay on-off circuit. The magnetic latching relay uses the principle of a seesaw switch. It only needs to pass an instantaneous current line into the coil when switching the circuit to keep the contacts engaged or disconnected. The coil does not need to be energized for a long time. It not only saves electricity during use, but also has high reliability. At the same time, the device sets two sets of main and auxiliary contacts in the magnetic latching relay. When the static main contact and the moving main contact are welded, the static auxiliary contact and the moving auxiliary contact can still disconnect the circuit, thereby improving the convenience of the device and extending the service life of the equipment. Furthermore, by setting a knocking structure, the welded static main contact and the moving main contact can be knocked to help separate the two, so that they can continue to normally disconnect or connect the circuit, further extending the service life of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 It is a schematic diagram of the overall structure of a three-phase electric energy meter of the present invention;

[0030] Figure 2 It is a front view of a three-phase electric energy meter of the present invention;

[0031] Figure 3 It is a structural schematic diagram of the magnetic latching relay in the present invention;

[0032] Figure 4 is an exploded view of the magnetic latching relay of the present invention;

[0033] Figure 5 Schematic diagram of the internal structure of the magnetic latching relay in the present invention;

[0034] Figure 6 for Figure 5 Enlarged view of point A in the middle;

[0035] Figure 7 A state diagram of the static main contact and the moving main contact of the magnetic latching relay in the present invention being separated;

[0036] Figure 8 A state diagram of the static main contact and the moving main contact of the magnetic latching relay in the present invention being engaged;

[0037] Fig. 9 for Figure 8 Enlarged view of point B in the middle.

[0038] In the figure:

[0039] 100. Watch case;

[0040] 200, magnetic latching relay;

[0041] 201, first terminal block; 2011, static main contact; 202, second terminal block; 2021, square hole; 2022, movable auxiliary contact; 203, cover plate; 204, shell; 2041, air hole; 2042, bellows; 205, coil; 2051, power terminal; 206, iron core; 2061, matching block; 207, impact rod; 2071, guide block; 2072, straight slot ; 208, rotating cap; 2081, column; 209, connecting block; 2091, limit plate; 210, telescopic rod; 2101, telescopic inner rod; 2102, telescopic outer rod; 2103, control screw; 2104, elastic member; 2105, second chamber; 211, rotating block; 212, main breaking plate; 2121, moving main contact; 213, auxiliary breaking plate; 2131, static auxiliary contact. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0043] like Figures 1 to 9 As shown, a three-phase electric energy meter provided by an embodiment of the present invention includes a meter case 100 and a magnetic latching relay 200 , wherein the magnetic latching relay 200 is packaged inside the meter case 100 .

[0044] The magnetic holding relay 200 includes a shell 204, a first terminal board 201 and a second terminal board 202, an intermediate plate group, a transmission component and a magnetic control component; one end of the first terminal board 201 and the second terminal board 202 are located inside the shell 204, and the other end is located outside the shell 204, and the end of the first terminal board 201 located inside the shell 204 is provided with a static main contact 2011, and the end of the second terminal board 202 located inside the shell 204 is provided with a static auxiliary contact 2131; the end of the first terminal board 201 located outside the shell 204 and the end of the second terminal board 202 located outside the shell 204 are connected to the terminal block on the case 100, and the circuit is connected through the terminal block to measure electric energy.

[0045] The middle plate group includes a main breaking plate 212 and a sub-breaking plate 213. Both ends of the sub-breaking plate 213 are fixedly connected to the shell 204. A moving sub-contact 2022 is provided on the sub-breaking plate 213. The moving sub-contact 2022 initially contacts the static sub-contact 2131. The main breaking plate 212 is arranged above the sub-breaking plate 213 and is fixedly connected to the sub-breaking plate 213 at one end away from the static sub-contact 2131. The main breaking plate 212 is elastic and can undergo a certain deformation. Specifically, it can be made of metal spring sheets. A moving main contact 2121 is provided on the main breaking plate 212. The moving main contact 2121 can contact or separate from the static main contact 2011.

[0046] The transmission assembly acts on the main disconnect plate 212 and the second terminal board 202, and is configured to drive the main disconnect plate 212 to move so that the moving main contact 2121 contacts or separates from the static main contact 2011, and is configured to drive the second terminal board 202 to move when the static main contact 2011 and the moving main contact 2121 are bonded, so that the static auxiliary contact 2131 separates from the moving auxiliary contact 2022 to cut off the circuit.

[0047] The magnetic control assembly is configured to control the action of the transmission assembly so that the transmission assembly acts on the main disconnecting plate 212 and the second terminal board 202 to control the on-off of the circuit.

[0048] A knocking structure is provided on the transmission assembly, and the knocking structure is configured to knock the bonding point of the static main contact 2011 and the moving main contact 2121 when the static main contact 2011 and the moving main contact 2121 are welded, so that the bonded static main contact 2011 and the moving main contact 2121 are separated.

[0049] It is understandable that when the static main contact 2011 and the moving main contact 2121 of the magnetic latching relay 200 are welded, the static main contact 2011 and the moving main contact 2121 are bonded and cannot be separated, resulting in the circuit being unable to be cut off. The present invention sets the moving auxiliary contact 2022 and the static auxiliary contact 2131, and cooperates with the action of the transmission component, so that when the static main contact 2011 and the moving main contact 2121 are welded and bonded, the moving auxiliary contact 2022 and the static auxiliary contact 2131 are separated to cut off the circuit, and at the same time, the welded bonding point of the static main contact 2011 and the moving main contact 2121 is knocked under the action of the knocking structure, so that the static main contact 2011 and the moving main contact 2121 are separated, ensuring that the circuit returns to a normal state and extending the service life of the setting.

[0050] In a further embodiment, the magnetron assembly includes an iron core 206 , a coil 205 and a rotating block 211 .

[0051] The iron core 206 is arranged at the bottom of the shell 204, and the coil 205 is wound on the outside of the iron core 206. Both ends of the coil 205 are connected to the power connection end 2051, which is convenient for energizing the coil 205. The rotating block 211 is rotatably arranged in the middle of the shell 204 and acts on the transmission component to control the movement of the transmission component. Both ends of the iron core 206 are provided with matching blocks 2061 pointing to the rotating block 211. The matching block 2061 is a ferromagnetic material. Specifically, the matching block 2061 can be made of the same material as the iron core 206.

[0052] The rotating block 211 is in an I-shaped structure, and an overhanging plate is formed on the upper left and lower left, upper right and lower right. Each matching block 2061 is located between the two overhanging plates on the corresponding side. The rotating block 211 is magnetic, and the upper end is a magnetic pole and the lower end is another magnetic pole. Figure 7 In a specific embodiment of the present invention, the upper end of the rotating block 211 is an N pole and the lower end is an S pole. After the coil 205 is energized, the iron core 206 is magnetized, with the left end being an S pole and the right end being an N pole. At the same time, the matching block 2061 connected to the iron core 206 is magnetized to the same polarity as the corresponding end of the iron core 206, that is, the matching block 2061 at the left end is an S pole, and the matching block 2061 at the right end is an N pole. At this time, the matching block 2061 on the left side is attracted to the upper left end of the rotating block 211, and the matching block 2061 on the right side is attracted to the lower end of the rotating block 211. The rotating block 211 deflects counterclockwise and drives the main disconnecting plate 212 to move through the transmission component, thereby driving the moving main contact 2121 to separate from the static main contact 2011. At this time, even if the coil 205 loses power, the iron core 206 and the matching block 2061 lose their magnetism, but the rotating block 211 is still attracted to the matching block 2061 to keep the circuit disconnected. When the on-off state of the circuit needs to be switched, a reverse current is passed through the coil 205, the iron core 206 is magnetized and reversed, the rotating block 211 swings clockwise, and the moving main contact 2121 is driven to contact the static main contact 2011 through the transmission component to connect the circuit. At this time, even if the coil 205 loses power, the iron core 206 and the matching block 2061 lose magnetism, but the rotating block 211 is still attracted to the matching block 2061 to keep the circuit connected. The present invention switches the on-off state of the seesaw switch (the rotating block 211 and the matching blocks 2061 on the left and right sides constitute the seesaw switch) by changing the polarity of the iron core 206, and when changing the polarity of the iron core 206, only an instantaneous current needs to be passed through the coil 205, and there is no need to energize the coil 205 for a long time, which not only saves electric energy but also has very high stability.

[0053] In a further embodiment, the transmission assembly includes a telescopic rod 210, and the telescopic rod 210 includes a telescopic inner rod 2101 and a telescopic outer rod 2102 that are slidably connected. A second chamber 2105 is formed between the telescopic inner rod 2101 and the telescopic outer rod 2102. In the initial state, the telescopic rod 210 can maintain a shortened state.

[0054] The bottom of the telescopic outer rod 2102 is hinged to the rotating block 211, and the telescopic inner rod 2101 is connected to the main disconnecting plate 212 to drive the main disconnecting plate 212 to move; a bellows 2042 is provided on the lower surface of the inner end of the second terminal board 202, the upper end of the bellows 2042 is connected to the lower surface of the second terminal board 202, the lower end of the bellows 2042 is connected to the shell 204, the position of the bellows 2042 and the static auxiliary contact 2131 correspond, a first chamber is formed inside the bellows 2042, the first chamber is connected to the second chamber 2105, the bellows 2042 can be extended and retracted, and the part of the second terminal board 202 where the corrugated plate is installed can be deformed. When the static main contact 2011 and the moving main contact 2121 can be disconnected normally, the telescopic rod 210 drives the main breaking plate 212 to swing up and down under the drive of the rotating block 211, so as to realize the normal disconnection or connection of the static main contact 2011 and the moving main contact 2121; when the static main contact 2011 and the moving main contact 2121 are welded and bonded, the rotating block 211 rotates counterclockwise to drive the telescopic rod 210 to extend, and the gas inside the first chamber formed by the bellows 2042 is drawn to the second chamber 2105 inside the telescopic rod 210. Under the action of the pressure difference, the part of the second terminal board 202 where the corrugated plate is installed is deformed downward, and the moving auxiliary contact 2022 and the static auxiliary contact 2131 are separated, so that the first terminal board 201 and the second terminal board 202 can also be disconnected.

[0055] It should be noted that, in order to facilitate the communication between the first chamber and the second chamber 2105 , the shell 204 is provided with an air hole 2041 that is connected to the interior of the bellows 2042 (the first chamber), and the air hole 2041 is connected to the second chamber 2105 through a hose.

[0056] Furthermore, in order to ensure reliable movement of the telescopic rod 210, in a preferred embodiment of the present invention, an elastic member 2104 is connected between the telescopic inner rod 2101 and the telescopic outer rod 2102, and the elastic member 2104 is preferably a tension spring. The elastic member 2104 makes the telescopic inner rod 2101 and the telescopic outer rod 2102 tend to approach each other, thereby making the telescopic rod 210 initially maintain a shortening trend. When the static main contact 2011 and the moving main contact 2121 are not bonded, the telescopic rod 210 can move as a whole to drive the main disconnecting plate 212 to move, so that the static main contact 2011 and the moving main contact 2121 are normally disconnected. In other embodiments, the telescopic inner rod 2101 and the telescopic outer rod 2102 can also be locked by friction fit, so that the telescopic rod 210 can maintain a shortening trend in the initial state.

[0057] Further, in order to facilitate the connection between the telescopic inner rod 2101 and the main breaking plate 212, the present invention preferably provides a connecting block 209 on the telescopic inner rod 2101, and the connecting block 209 includes an upper block and a lower block, and the upper block and the lower block are arranged at intervals from top to bottom. The free end of the main breaking plate 212 is sleeved on the telescopic inner rod 2101 and is located between the upper block and the lower block. In order to facilitate assembly and simplify parts, the upper block and the lower block of the connecting block 209 are connected at one end and integrally formed to form a U-shaped plate, and the opening is placed to the side. How to set it so that the main breaking plate 212 has a certain amount of space for movement during the swinging of the telescopic rod 210 to avoid getting stuck. In other embodiments, a hinge block can also be provided on the telescopic inner rod 2101, and the free end of the main breaking plate 212 is hinged to the hinge block to avoid getting stuck.

[0058] Further, to facilitate the separation of the static auxiliary contact 2131 and the movable auxiliary contact 2022, the second wiring board 202 includes a main board body and a deformation plate arranged at the inner end of the main board body, the thickness of the deformation plate is less than the thickness of the main board body, the bellows 2042 is arranged on the lower surface of the deformation plate, and the connection position of the second wiring board 202 and the housing 204 is located at the junction of the main board body and the deformation plate and is facing one side of the main board body, so that when the gas in the first chamber is pumped into the second chamber 2105, the elastic plate is more likely to bend downward under the action of the upper and lower pressure differences, and then it can more reliably drive the static auxiliary contact 2131 to separate from the movable auxiliary contact 2022. In the preferred embodiment given by the present invention, the lower surface of the deformation plate is coplanar with the main board body, and the inner end of the second wiring board 202 can be processed and formed by welding or cutting.

[0059] Furthermore, a square hole 2021 is provided on the second wiring board 202 . The size of the square hole 2021 is larger than the outer diameter of the telescopic rod 210 , and the telescopic rod 210 passes through the square hole 2021 .

[0060] In a further embodiment, in order to facilitate the connection between the transmission rod and the rotating block 211, a connecting rod is provided on the upper surface of the rotating block 211. The connecting rod is located on one side of the rotating block 211 and extends obliquely upward. The transmission rod is located on one side of the rotation center of the rotating block 211 and is hinged to the connecting rod. When the rotating block 211 rotates in different directions, the transmission rod can be driven to move through the connecting rod, thereby causing the transmission rod to drive the main dividing plate 212 to swing up and down to achieve contact and separation of the static main contact 2011 and the moving main contact 2121.

[0061] In a further embodiment, the knocking assembly includes a control screw 2103, a rotating cap 208 and an impact rod 207; the adjusting screw is coaxially slidably inserted into the telescopic inner rod 2101 and the lower end is connected to the telescopic outer rod 2102; the rotating cap 208 is rotatably set at the upper end of the telescopic inner rod 2101 and is spirally connected to the adjusting screw, and a column 2081 is set on the upper surface of the rotating cap 208.

[0062] The impact rod 207 is located above the rotating cap 208 and points to the junction of the static main contact 2011 and the moving main contact 2121. The impact rod 207 can move along the radial direction of the rotating cap 208 (that is, the impact rod 207 can move away from or close to the static main contact 2011 and the moving main contact 2121 and then impact the junction of the static main contact 2011 and the moving main contact 2121). A guide block 2071 is provided on the side of the impact rod 207 away from the static main contact 2011 and the moving main contact 2121. A straight slot 2072 running through the guide block 2071 is provided. The column 2081 is slidably arranged in the straight slot 2072. During the rotation of the rotating cap 208, the guide block 2071 is pushed by the main body to drive the impact rod 207 to move.

[0063] Further, in order to limit the impact rod 207, a limit plate 2091 is provided on the telescopic inner rod 2101, the limit plate 2091 extends vertically, and a guide slot is provided inside the limit plate 2091, the guide slot is parallel to the axis of the telescopic inner rod 2101, and the slot width is adapted to the diameter of the impact rod 207, and the impact rod 207 is slidably arranged in the guide slot. For the convenience of structural setting, the limit plate 2091 is arranged above the connecting block 209, and the limit plate 2091 is vertically arranged on the connecting block 209 and extends upward. Further, a detachable cap (not shown in the figure) is provided on the rotating cap 208, the lower surface of the cap is slidably fitted with the upper surface of the guide block 2071, and the outer diameter of the cap is greater than the width of the straight slot 2072, so as to limit the guide block 2071 from being separated from the rotating cap 208. Further, the head of the impact rod 207 has a certain elasticity, which can avoid being stuck during impact.

[0064] In a further embodiment, a cover plate 203 is provided on the housing 204, and the cover plate 203 is detachably connected to the housing 204, thereby facilitating assembly and maintenance.

[0065] In combination with the above embodiments, the use principle and working process of the present invention are as follows:

[0066] (1) Normal working conditions

[0067] When the static main contact 2011 and the dynamic main contact 2121 can be disconnected normally, refer to Figure 7, a positive current is passed through the coil 205, the iron core 206 is magnetized and presents a magnetic pole distribution of left S and right N, and at the same time, the left end matching block 2061 is the same as the left end magnetic pole of the iron core 206, and the right end matching block 2061 is the same as the right end magnetic pole of the iron core 206. Due to the principle that like repels like and opposites attract, the rotating block 211 rotates counterclockwise to drive the telescopic rod 210 to move. The movement of the telescopic rod 210 will pull one end of the main disconnecting plate 212 so that the moving main contact 2121 is away from the static main contact 2011, and the connection between the first terminal board 201 and the second terminal board 202 is disconnected. After that, even if the coil 205 is no longer energized, the rotating block 211 can still remain adsorbed with the matching block 2061 (the matching block 2061 itself is a ferromagnetic material), that is, the first terminal board 201 and the second terminal board 202 remain disconnected;

[0068] When the coil 205 is supplied with current in the opposite direction, the magnetic pole of the iron core 206 is reversed, and the rotating block 211 is reversed (clockwise) due to the magnetic force. The telescopic rod 210 moves and pulls one end of the main disconnecting plate 212 to make the moving main contact 2121 contact with the static main contact 2011, that is, the first power connection terminal 2051 is connected to the second power connection terminal 2051. Similarly, when the coil 205 is powered off, the static main contact 2011 and the moving main contact 2121 can still maintain contact, that is, the coil 205 does not need to be powered on for a long time to achieve the disconnection of the static main contact 2011 and the moving main contact 2121.

[0069] (2) Unexpected circumstances

[0070] In the case where the static main contact 2011 and the moving main contact 2121 cannot be torn apart due to welding, when a positive current is passed through the coil 205, the rotating block 211 rotates counterclockwise to drive the static main contact 2011 and the moving main contact 2121 to separate, since the static main contact 2011 and the moving main contact 2121 are welded, the main breaking plate 212 cannot follow the movement of the telescopic rod 210, and the telescopic rod 210 is stretched, that is, the telescopic inner rod 2101 and the telescopic outer rod 2102 move away from each other, the elastic member 2104 (tension spring) is stretched, the volume of the second chamber 2105 increases, and the gas in the bellows 2042 is drawn into the second chamber In chamber 2105, the inner end of the second terminal board 202 is pulled downward under the action of the pressure difference, and the static auxiliary contact 2131 is separated from the moving auxiliary contact 2022, thereby still being able to achieve power disconnection between the first terminal board 201 and the second terminal board 202; during the extension of the telescopic rod 210, the telescopic outer rod 2102 drives the control screw 2103 to move relative to the main disconnecting plate 212, driving the rotating cap 208 to rotate, and during the rotation of the rotating cap 208, it drives the impact rod 207 to knock on the static main contact 2011 or the moving main contact 2121, thereby helping to separate the static main contact 2011 and the moving main contact 2121. When the first terminal block 201 and the second terminal block 202 need to be energized, a reverse current is passed through the coil 205, the telescopic inner rod 2101 and the telescopic outer rod 2102 approach each other, the volume of the second chamber 2105 decreases, the gas in the second chamber 2105 is pressed into the first chamber, the inner end of the second terminal block 202 is reset, the static auxiliary contact 2131 and the moving auxiliary contact 2022 engage, and at the same time, the telescopic outer rod 2102 drives the control screw 2103 to move relative to the main breaking plate 212, and drives the rotating cap 208 to rotate under the action of the spiral fit, and the rotation of the rotating cap 208 drives the impact rod 207 to strike the fusion welding joint of the static main contact 2011 and the moving main contact 2121 again, thereby assisting in the separation of the bonding joint of the static main contact 2011 and the moving main contact 2121. After multiple breaking and striking, the fusion welding joint of the static main contact 2011 and the moving main contact 2121 can be separated, and the normal on-off state is restored.

[0071] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A three-phase electric energy meter, characterized in that: It includes a case and a magnetic latching relay, wherein the magnetic latching relay is encapsulated inside the case; the magnetic latching relay includes: case; A first wiring board and a second wiring board, one end of the first wiring board and the second wiring board are located inside the housing and the other end is located outside the housing, the end of the first wiring board located inside the housing is provided with a static main contact; the end of the second wiring board located inside the housing is provided with a static auxiliary contact; The intermediate plate group includes a main breaking plate and a sub-breaking plate, both ends of the sub-breaking plate are fixedly connected to the housing, a moving sub-contact is arranged on the sub-breaking plate, and the moving sub-contact is initially in contact with the static sub-contact, the main breaking plate is arranged above the sub-breaking plate and one end away from the static sub-contact is fixedly connected to the sub-breaking plate, the main breaking plate is elastic, and a moving main contact is arranged on the main breaking plate, and the moving main contact can be in contact with or separated from the static main contact; A transmission assembly, which acts on the main disconnecting plate and the second terminal block, is configured to drive the main disconnecting plate to move so that the moving main contact contacts or separates from the static main contact, and is configured to drive the second terminal block to move so that the static auxiliary contact separates from the moving auxiliary contact when the static main contact and the moving main contact are bonded to cut off the circuit; A magnetic control assembly configured to control the action of the transmission assembly so that the transmission assembly acts on the main disconnecting plate and the second wiring board to control the on and off of the circuit; A knocking structure is provided on the transmission component, and the knocking structure is configured to knock the bonding points of the static main contact and the moving main contact when the static main contact and the moving main contact are welded, so that the bonded static main contact and the moving main contact are separated.

2. A three-phase electric energy meter according to claim 1, characterized in that: The magnetron assembly includes an iron core, a coil and a rotating block; the iron core is arranged at the bottom of the shell, the coil is wound around the outside of the iron core, the rotating block is rotatably arranged in the middle of the shell and acts on the transmission assembly to control the movement of the transmission assembly, and both ends of the iron core are provided with matching blocks pointing to the rotating block, and the matching blocks are made of ferromagnetic material; The rotating block is in an I-shaped structure, and an overhanging plate is formed on the upper left and lower left, and the upper right and lower right. Each matching block is located between the two overhanging plates on the corresponding side. The rotating block is magnetic, and the upper end is a magnetic pole and the lower end is another magnetic pole.

3. A three-phase electric energy meter according to claim 2, characterized in that: The transmission assembly includes a telescopic rod, the telescopic rod includes a telescopic inner rod and a telescopic outer rod which are slidably sleeved, a second chamber is formed between the telescopic inner rod and the telescopic outer rod, and in an initial state, the telescopic rod can be kept in a shortened state; The bottom of the telescopic outer rod is hinged to the rotating block, and the telescopic inner rod is connected to the main dividing plate to drive the main dividing plate to move; A bellows is provided on the lower surface of the inner end of the second terminal block, the upper end of the bellows is connected to the lower surface of the second terminal block, the lower end of the bellows is connected to the shell, the bellows corresponds to the position of the static auxiliary contact, a first chamber is formed inside the bellows, the first chamber is connected to the second chamber, the bellows can be extended and retracted, and the part of the inner end of the second terminal block where the corrugated plate is installed can be deformed.

4. A three-phase electric energy meter according to claim 3, characterized in that: An elastic member is connected between the telescopic inner rod and the telescopic outer rod, and the elastic member makes the telescopic inner rod and the telescopic outer rod tend to approach each other.

5. A three-phase electric energy meter according to claim 3, characterized in that: A connecting rod is arranged on the upper surface of the rotating block. The connecting rod is located at one side of the rotating block and extends obliquely upward. The transmission rod is located at one side of the rotating center of the rotating block and is hinged to the connecting rod.

6. A three-phase electric energy meter according to claim 3, characterized in that: A connecting block is arranged on the telescopic inner rod, and the connecting block comprises an upper block and a lower block, the upper block and the lower block are arranged at intervals, and the free end of the main dividing plate is sleeved on the telescopic inner rod and located between the upper block and the lower block.

7. A three-phase electric energy meter according to claim 3, characterized in that: The second terminal block includes a main board body and a deformation plate arranged at the inner end of the main board body, the thickness of the deformation plate is less than the thickness of the main board body, the bellows is arranged on the lower surface of the deformation plate, and the connection position between the second terminal block and the shell is located at the junction of the main board body and the deformation plate and is facing one side of the main board body.

8. A three-phase electric energy meter according to claim 3, characterized in that: The striking assembly includes a control screw, a rotating cap and a striking rod; The adjusting screw is coaxially slidably inserted into the telescopic inner rod and the lower end is connected to the telescopic outer rod; The rotating cap is rotatably arranged on the upper end of the telescopic inner rod and is spirally connected with the adjusting screw, and a column is arranged on the upper surface of the rotating cap; The impact rod is located above the rotating cap and points to the junction of the static main contact and the moving main contact. The impact rod can move along the radial direction of the rotating cap. A guide block is provided on the side of the impact rod away from the static main contact and the moving main contact. A straight slot running through the guide block is provided, and the column is slidably arranged in the straight slot.

9. A three-phase electric energy meter according to claim 8, characterized in that: A limit plate is arranged on the telescopic inner rod, the limit plate extends vertically, a guide slot is arranged inside the limit plate, the guide slot is parallel to the axis of the telescopic inner rod and the slot width is adapted to the diameter of the impact rod, and the impact rod is slidably arranged in the guide slot.

10. A three-phase electric energy meter according to claim 1, characterized in that: A cover plate is arranged on the shell body, and the cover plate is detachably connected to the shell body.

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