Arc extinguishing chamber structure of built-in load switch for electric energy meter

Abstract

The utility model relates to a kind of arc-extinguishing chamber structure of built-in load switch for electric energy meter, comprising: arc shield, the arc shield at least has one arc entrance;Arc-extinguishing part, is located in arc shield, arc is introduced into the region defined by arc shield and arc-extinguishing part according to preset path and is extinguished;After arc is introduced into arc-extinguishing chamber, it is divided into several short arcs by multiple parallel arranged metal lattices (each lattice forms a break between each other), lattice (usually steel or copper alloy) absorbs arc heat, reduces temperature, inhibits gas ionization, and lattice arc-extinguishing is realized high-efficiency arc-extinguishing by dividing arc, superimposed voltage, rapid cooling.

Description

Technical Field

[0001] This utility model relates to the field of load switch technology, and in particular to an arc-extinguishing chamber structure for a built-in load switch in an electricity meter. Background Technology

[0002] When a switching device disconnects a circuit, an electric arc is generated between the contacts. An electric arc is a high-temperature, conductive plasma that continues to burn and maintain circuit continuity. Arc-extinguishing devices use various physical and chemical methods to extinguish the arc within a short time, thereby achieving reliable circuit disconnection.

[0003] Arc-extinguishing devices not only extinguish the electric arc but also prevent it from reigniting after the contacts separate. They do this by limiting arc energy and reducing the electric field strength between the contacts, thus restoring the insulating properties of the dielectric between them and preventing reignition, ensuring the circuit remains open.

[0004] The high temperature and strong current generated by an electric arc can cause severe erosion and wear on the contacts, shortening their service life. Simultaneously, the arc can also damage surrounding equipment and insulation materials. Arc-extinguishing devices can quickly extinguish the arc, reducing damage to contacts and other equipment, and improving equipment reliability and safety.

[0005] The performance of arc-extinguishing devices directly affects the breaking capacity of switching devices. By effectively extinguishing the arc, switching devices can reliably break circuits under higher voltages and currents, meeting the needs of different power systems and electrical equipment.

[0006] In view of the above, it is necessary to propose an arc-extinguishing chamber structure with a built-in load switch for electricity meters to solve the above problems. Utility Model Content

[0007] The purpose of this invention is to overcome the defects in the existing technology and provide an arc-extinguishing chamber structure for an electricity meter with a built-in load switch.

[0008] To achieve the above objectives, the technical solution of this utility model is to design an arc-extinguishing chamber structure for a built-in load switch in an electricity meter, comprising: an arc-extinguishing cover, wherein the arc-extinguishing cover has at least one arc inlet; The arc-extinguishing section, located inside the arc-extinguishing chamber, guides the electric arc along a preset path into the area defined by the arc-extinguishing chamber and the arc-extinguishing section to extinguish it.

[0009] In a further preferred embodiment, the arc-extinguishing shroud has a U-shaped structure, and the arc-extinguishing shroud has a closed end and an arc inlet corresponding to the closed end.

[0010] In a further preferred embodiment, the arc-extinguishing section includes an arc-extinguishing grid assembly.

[0011] A further preferred technical solution is that the arc-extinguishing grid assembly includes multiple arc-extinguishing grids stacked along the length direction of the arc-extinguishing shroud.

[0012] A further preferred technical solution also includes an arc-initiating plate, which is disposed on one side of the arc-extinguishing section along the length direction of the arc-extinguishing cover.

[0013] A further preferred technical solution is that each arc-extinguishing grid has a bent portion at one end and an arc-inducing groove at the other end.

[0014] In a further preferred embodiment, the bent portion is inclined along the length direction of the arc-extinguishing cover.

[0015] In a further preferred embodiment, the bent portion is close to the arc inlet end of the arc extinguishing shroud, and the arc-initiating groove is far from the arc inlet end of the arc extinguishing shroud.

[0016] In a further preferred embodiment, the arc-extinguishing cover is provided with multiple perforations, which penetrate the arc-extinguishing cover along its height direction.

[0017] A further preferred technical solution is that at least one perforation is provided between two adjacent arc-extinguishing grid plates.

[0018] The advantages and beneficial effects of this invention are as follows: When the circuit is broken, an electric arc (conductive channel) is formed between the contacts due to the high-temperature ionized gas. After the arc is introduced into the arc-extinguishing chamber, it is divided into several short arc segments by multiple parallel metal grids (each grid segment forms a break). The grids (usually steel or copper alloy) absorb the heat of the arc, reduce the temperature, and suppress gas ionization. The grid arc extinguishing achieves efficient arc extinguishing through arc segmentation, voltage superposition, and rapid cooling.

[0019] However, during the arc generation process, material transfer occurs, and some of the material on the arc-extinguishing grid will transfer to the contact surface, affecting the contact resistance. Therefore, the arc-extinguishing grid is kept at a certain distance from the moving and stationary contacts, and the arc is introduced into the arc-extinguishing chamber through the arc-initiating plate to reduce material transfer.

[0020] Meanwhile, an exhaust port is set on the plastic base. The exhaust port is located at the rear of the arc-extinguishing chamber. Since the switch is under high air pressure when the arc is generated, the gas inside the switch will be discharged outward. After the exhaust port is added, the arc moves towards the exhaust port with the change of air pressure and enters the arc-extinguishing chamber, thereby expelling the charged particles and improving the arc-extinguishing effect. Attached Figure Description

[0021] Figure 1 This is an axonometric view of an embodiment of the present utility model; Figure 2 This is an axonometric view of one embodiment of the present utility model; Figure 3This is an isometric view of the arc-extinguishing part of Embodiment 1 of this utility model; Figure 4 This is a top view of the arc-extinguishing part in Embodiment 1 of this utility model; Figure 5 This is an isometric view of the arc-extinguishing shield according to Embodiment 1 of this utility model; Figure 6 This is an axonometric view of embodiment two of the present invention; Figure 7 This is an isometric view of the second embodiment of the present invention in use. In the diagram: 100, outer casing; 200, stationary contact; 300, moving contact; 400, arc-extinguishing chamber structure; 410. Arc extinguishing cover; 411. Snap-fit ​​groove; 412. Hole; 420. Arc-extinguishing section; 421. Arc-extinguishing grid plate; 422. Bending section; 423. Protruding structure; 424. Arc-starting groove; 430. Arc-starting plate. Detailed Implementation

[0022] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solution of this utility model and should not be construed as limiting the scope of protection of this utility model.

[0023] This application provides an arc-extinguishing chamber structure for an electricity meter with a built-in load switch, used to extinguish the electric arc in the switch.

[0024] The arc-extinguishing chamber structure 400 includes: an arc-extinguishing cover 410 and an arc-extinguishing section 420.

[0025] When a switching device disconnects a circuit, an electric arc is generated between the contacts. An electric arc is a high-temperature, conductive plasma that continues to burn and maintain circuit continuity. The arc is extinguished within the cavity of the arc extinguishing chamber 410. Not only must the arc be extinguished, but it must also be prevented from reigniting after the contacts separate. Therefore, the arc extinguishing chamber 410 generally has a cavity structure to isolate other equipment, allowing the arc to enter the cavity and be extinguished, reducing damage to the contacts and other equipment, and improving the reliability and safety of the equipment.

[0026] The arc-extinguishing chamber 410 has at least one arc inlet, which allows an electric arc to enter the arc-extinguishing chamber 410 from around the moving contact 300 and the stationary contact 200. The stationary contact 200 is relatively fixed in its installation position within the switch, and the moving contact 300 rotates to the vicinity of the stationary contact 200 to make contact with it. Therefore, the arc generated when the moving contact 300 contacts or disconnects from the stationary contact 200 generally occurs around the stationary contact 200. Based on the above, it can be seen that the arc enters the arc-extinguishing chamber 410 from around the stationary contact 200.

[0027] In one embodiment, the arc extinguishing cover 410 has a U-shaped structure, with a closed end and an arc inlet end corresponding to the closed end, so that the arc enters the arc extinguishing cover 410 along the path from the arc inlet to the closed end.

[0028] In other embodiments, the arc extinguishing cover 410 has a rectangular mounting cavity with an arc inlet communicating with the outside, and the arc enters the arc extinguishing cover 410 along the arc inlet.

[0029] The arc extinguishing cover 410 is provided with an arc extinguishing part 420, wherein the arc extinguishing part 420 may be an arc extinguishing grid assembly, used to extinguish the electric arc entering the arc extinguishing cover 410.

[0030] Furthermore, the arc-extinguishing section 420 may include an arc-extinguishing inlet. For example, the arc-extinguishing inlet is located at one end of the arc-extinguishing section 420 corresponding to the arc inlet end of the arc-extinguishing cover 410.

[0031] The stationary contact 200 is located on one side of the arc inlet end of the arc extinguishing cover 410, and the arc is introduced into the arc extinguishing part 420 from the top of the arc extinguishing part 420 for arc extinguishing.

[0032] In one embodiment, the arc-extinguishing unit 420 includes an arc-extinguishing grid assembly and a grid support. The arc-extinguishing grid assembly includes a plurality of arc-extinguishing grids 421 stacked along a first direction X of the arc-extinguishing shield. The length direction of the arc-extinguishing shield is the first direction X, the width direction of the arc-extinguishing shield is the second direction Y, and the height direction of the arc-extinguishing shield is the third direction Z. The first direction X, the second direction Y, and the third direction Z are perpendicular to each other.

[0033] Each arc-extinguishing grid plate 421 has a Y-shaped arc-inducing groove 424 on one side near the stationary contact 200. For example, when the arc-extinguishing cover 410 has a U-shaped structure, the arc inlet end of the arc-extinguishing cover 410 has two unclosed side surfaces on one pair of sides. The direction from one unclosed side surface to the other unclosed side surface is parallel to the first direction X. Multiple arc-extinguishing grid plates 421 are equally spaced along the direction from one unclosed side surface to the other unclosed side surface of the U-shaped arc-extinguishing cover 410. The grid plate support includes a first side plate and a second side plate. The first side plate is disposed on one side of the arc-extinguishing grid assembly along the second direction Y of the arc-extinguishing cover 410, and the second side plate is disposed on the other side of the arc-extinguishing grid assembly along the second direction Y. For example, when the arc-extinguishing cover 410 has a U-shaped structure, a pair of sides at the arc inlet end of the arc-extinguishing cover 410 have two closed sides. The direction from one closed side to the other closed side is parallel to the second direction Y. The first side plate is disposed on the closed side of one side of the arc-extinguishing grid assembly along the second direction Y of the arc-extinguishing cover 410, and the second side plate is disposed on the closed side of the other side of the arc-extinguishing grid assembly along the second direction Y. One end of each arc-extinguishing grid 421 is fixed on the first side plate, and the other end of each arc-extinguishing grid 421 is fixed on the second side plate.

[0034] The arc-extinguishing grid assembly comprises multiple arc-extinguishing grids 421 stacked along a first direction X. The arc-extinguishing grids 421 can be made of steel or copper alloy. After the arc enters the arc-extinguishing chamber, the arc-extinguishing grids 421 divide a long arc into multiple short arc segments. When the alternating current crosses zero, all short arcs extinguish simultaneously. Therefore, the more layers of arc-extinguishing grids 421 there are, the more times and the more times the long arc is divided, resulting in a better arc-extinguishing effect of the arc-extinguishing grid assembly. Specifically, the number of arc-extinguishing grids 421 in the arc-extinguishing grid assembly can be greater than or equal to 5 layers to ensure the arc-extinguishing effect of the assembly.

[0035] Furthermore, each arc-extinguishing grid plate 421 is provided with an arc-initiating groove 424. The arc-initiating groove 424 is used to introduce the electric arc into the arc-extinguishing grid plate 421 for arc extinguishing. Specifically, the shape of the arc-initiating groove 424 includes, but is not limited to, a V-shaped arc-initiating groove 424 and a Y-shaped arc-initiating groove 424. Compared to the V-shaped arc-initiating groove 424, the Y-shaped arc-initiating groove 424 allows the electric arc to enter the arc-extinguishing grid plate 421 more easily, thereby improving the arc extinguishing effect.

[0036] like Figure 6 As shown, the arc-extinguishing grid plate 421 in this application is provided with a Y-shaped arc-inducing groove 424.

[0037] Specifically, each arc-extinguishing grid plate 424 is provided with a Y-shaped arc-initiating groove 424 on the side near the arc inlet of the arc-extinguishing shroud, making it easier for the arc to enter the arc-extinguishing grid plate 421, thereby improving the arc-extinguishing effect of the arc-extinguishing chamber.

[0038] The arc-extinguishing grid support may include a first side plate and a second side plate arranged opposite each other along the second direction Y. Both the first and second side plates can fix the arc-extinguishing grid 421, making the arc-extinguishing grid 421 relatively stable and ensuring its arc-extinguishing effect.

[0039] Based on the description of the above embodiments, the arc-extinguishing grid assembly in the arc-extinguishing section 420 includes multiple arc-extinguishing grids 421 stacked along the first direction X. Each arc-extinguishing grid 421 has a Y-shaped arc-initiating groove 424 on the side near the arc inlet of the arc-extinguishing cover 410, making it easier for the arc to enter the arc-extinguishing grid 421, thereby improving the arc-extinguishing effect of the arc-extinguishing chamber 1. The grid support may include a first side plate and a second side plate arranged opposite to each other along the second direction Y. Both the first side plate and the second side plate can fix the arc-extinguishing grid 421, making the arc-extinguishing grid 421 relatively stable during switching, so as to ensure the arc-extinguishing effect of the arc-extinguishing grid 421.

[0040] Furthermore, the assembly structure of the first side plate, the second side plate, and the arc-extinguishing grid plate 421 can include, but is not limited to, the following two cases: In the first scenario, the arc-extinguishing grid plate 421 has protruding structures on both sides along the second direction Y. Several snap-fit ​​slots are correspondingly provided on the first and second side plates, with each slot corresponding to a protruding structure. The protruding structures are snapped into the snap-fit ​​slots, thus fixing the arc-extinguishing grid plate 421 between the first and second side plates.

[0041] In the second scenario, the arc-extinguishing grid plate 421 has reverse locking grooves on both sides of the second direction Y, with the arc inlet direction of the reverse locking grooves facing the first side plate and the second side plate respectively. The two reverse locking grooves are respectively engaged with the first side plate and the second side plate, thus fixing the arc-extinguishing grid plate 421 between the first side plate and the second side plate.

[0042] like Figure 2 and Figure 3 As shown, the arc-starting plate 430 is disposed on one side of the arc-extinguishing section 420 along the first direction X, that is, at the top of the arc-extinguishing section 420. The arc-starting plate 430 is used to introduce the electric arc from the top of the arc-extinguishing section 420 for arc extinguishing.

[0043] Furthermore, the arc-initiating plate 430 disposed on top of the arc-extinguishing section 420 along the first direction X can be regarded as a layer of arc-extinguishing grid 421. That is, the number of layers of arc-extinguishing grid 421 in the arc-extinguishing grid group is increased, thereby further improving the arc-extinguishing effect of the arc-extinguishing chamber.

[0044] In some embodiments, the arc-extinguishing grid plate 421 is directly mounted on the arc-extinguishing cover 410, and the arc-extinguishing grid plate 421 has protrusion structures 423 on both sides along the second direction Y. A plurality of snap-fit ​​slots 411 are correspondingly provided on a pair of sides of the arc-extinguishing cover 410, such that each snap-fit ​​slot 411 corresponds to a protrusion structure 423. The protrusion structure 423 is snapped into the snap-fit ​​slot 411, thereby fixing the arc-extinguishing grid plate 421 between the arc-extinguishing covers 410. This structure can optimize the arc-extinguishing device, making the arc-extinguishing device structure simpler and more miniaturized, facilitating the miniaturization of the entire switch.

[0045] Furthermore, each arc-extinguishing grid plate 421 has a bent portion 422 at one end and an arc-initiating groove 424 at the other end. The bent portion 422 is used to introduce the electric arc into the arc-extinguishing grid plate 421 for arc extinguishing. Specifically, the bent portion 422 is inclined along the first direction X. The arc-initiating groove 424 includes, but is not limited to, a V-shaped arc-initiating groove 424, a Y-shaped arc-initiating groove 424, or a U-shaped arc-initiating groove 424. Unlike previous designs, the arc-initiating groove 424 is located away from the arc inlet, while the bent portion 422 is located at the arc inlet. The bent portion 422 can both introduce the electric arc into the arc-extinguishing section 420 for arc extinguishing and form an arc-extinguishing path in conjunction with the arc-initiating groove 424. The bent portion 422 can prevent the probability of the arc escaping in the reverse direction during arc extinguishing, and the arc-initiating groove 424 introduces the electric arc from the arc inlet to the bottom of the arc-extinguishing chamber.

[0046] For example, when the arc-extinguishing shield 410 has a U-shaped structure, the arc inlet end of the arc-extinguishing shield 410 has two unclosed side surfaces on one side. The direction from one unclosed side surface to the other unclosed side surface is the first direction X. Multiple arc-extinguishing grid plates 421 are evenly spaced along the direction from one unclosed side surface to the other of the U-shaped arc-extinguishing shield 410. Each arc-extinguishing grid plate 421 has a bent portion 422 at one end corresponding to the arc inlet of the arc-extinguishing shield, and an arc-initiating groove 424 at the other end. The bent portion 422 is used to introduce the arc into the arc-extinguishing grid plate 421 for arc extinguishing. Specifically, the bent portion 422 is inclined along the first direction X, i.e., inclined towards one unclosed side surface, and the arc-initiating groove 424 is a U-shaped arc-initiating groove.

[0047] The angle between the bent portion 422 and the body of the arc-extinguishing grid plate 421 is greater than 150 degrees and less than 180 degrees. Preferably, the angle is between 165 degrees and 175 degrees.

[0048] The number of arc-extinguishing grids 421 in the arc-extinguishing grid assembly can be greater than or equal to 5 layers to ensure the arc-extinguishing effect of the arc-extinguishing grid assembly.

[0049] An arc-inducing plate 430 is provided on the outermost side of the arc-extinguishing grid plate 421 in the bending direction. The arc-inducing plate 430 has a first arc-inducing portion inclined on one side of the arc-extinguishing grid plate 421 and a second arc-inducing portion inclined on the first arc-inducing portion. The angle between the first arc-inducing portion and the second arc-inducing portion is greater than 150 degrees and less than 180 degrees. Preferably, the angle is between 165 degrees and 175 degrees. The arc-inducing plate 430 is used to introduce an electric arc from the top of the arc-extinguishing portion 420 for arc extinguishing. Furthermore, the angle between the first arc-inducing portion and the second arc-inducing portion is smaller than the angle between the bending portion 422 and the body of the arc-extinguishing grid plate 421.

[0050] Based on the description of the above embodiments, and in conjunction with the usage environment of the arc extinguishing device, an exemplary explanation will be provided.

[0051] like Figure 1 As shown, the arc-extinguishing chamber is fixedly connected to the switch housing 100, and the arc-extinguishing device is located in the mounting cavity of the switch housing 100.

[0052] The aforementioned arc extinguishing device being positioned close to the stationary contact 200 and the moving contact 300 means that it is adjacent to the stationary contact 200 and the moving contact 300, and the distance between it and the stationary contact 200 and the moving contact 300 is within a preset range, so that the arc extinguishing device can capture and extinguish the electric arc at the stationary contact 200 and the moving contact 300.

[0053] At the moment of contact separation or closure, an electric arc may be generated due to changes in current. This arc not only causes severe erosion of the contacts, reducing the switch's lifespan, but may also lead to safety hazards such as short circuits. To effectively address this problem, the switch 100 in this embodiment is specially equipped with an arc-extinguishing chamber. The arc-extinguishing chamber, composed of metal sheets or grids, can extinguish the arc and accelerate its cooling and extinguishing process. The arc-extinguishing chamber is fixedly connected to the switch housing 100 by methods such as welding, screwing, snap-fitting, or bonding, ensuring the stability and reliability of the arc-extinguishing device during switch operation and preventing loosening or damage due to vibration or impact. The arc-extinguishing chamber is located within the switch mounting cavity and is adjacent to the stationary contact 200 and the moving contact 300, allowing it to function immediately upon arc generation, effectively guiding the arc to the grids and rapidly extinguishing it through mechanisms such as segmentation and cooling. It can significantly improve the arc-extinguishing performance of the switch, extend the service life of contacts and other components such as push cards, and reduce safety hazards caused by electric arcs.

[0054] Optionally, such as Figure 1As shown, the arc-extinguishing chamber is located on the third Z-direction side of the contact position between the stationary contact 200 and the moving contact 300, and between the two lead-out pieces. It is understood that since one end of the moving contact unit is fixed relative to the stationary contact unit, while the other end is adapted to move closer to or further away from the stationary contact unit under the drive of the pushing system, and the moving contact 300 and the stationary contact 200 engage in a snapping motion, there is inevitably a problem of contact overlap at the flared end. The arc is prone to splashing towards the arc inlet direction at the flared end. Furthermore, when a large contact gap is used, the flared end is larger, making the arc splashing range even more uncontrollable and easily burning components such as the push card. In this embodiment, placing the arc-extinguishing chamber on the third Z-direction side of the contact position between the stationary contact 200 and the moving contact 300 (i.e., on the side in the arc inlet direction of the flared end) can significantly improve the arc-extinguishing capability of the arc-extinguishing grid and solve the problem of arc splashing.

[0055] In some embodiments, such as Figure 7 As shown, the arc-extinguishing chamber is located on one side of the contact position of the stationary contact 200 and the moving contact 300 in the third direction Z and is located in the switch housing on one side of the two lead-out plates. The housing 100 is provided with a driving member 500. The driving member 500 drives the moving contact to contact or separate from the stationary contact through a gear transmission mechanism 600. The arc-extinguishing chamber includes an arc-extinguishing cover 410 and a plurality of arc-extinguishing grid plates 421.

[0056] The arc extinguishing cover 410 is fixed inside the housing 100, for example, it is fixedly installed on one side of the third direction Z at the contact position of the stationary contact 200 and the moving contact 300. The arc extinguishing cover 410 is fixedly connected to the switch housing 100 by means of welding, snap-fitting or bonding.

[0057] Multiple arc-extinguishing grid plates 421 are located on the side of the arc-extinguishing cover 410 near the stationary contact 200 and the moving contact 300, and are fixedly connected to the arc-extinguishing cover 410.

[0058] Optionally, the arc-extinguishing cover 410 is made of insulating material such as plastic, and the arc-extinguishing grid 421 is made of metal.

[0059] In this embodiment, the arc extinguishing cover 410 can install and fix multiple arc extinguishing grid plates 421, maintain the stability of the relative positions of the multiple arc extinguishing grid plates 421, and enable the multiple arc extinguishing grid plates 421 to perform the functions of arc initiation and arc extinguishing.

[0060] In some embodiments, the arrangement direction of the plurality of arc-extinguishing grids 421 is parallel to the arrangement direction of the moving contact unit and the stationary contact unit. That is, the arrangement direction of the plurality of arc-extinguishing grids 421 is along the first direction X.

[0061] Multiple arc-extinguishing grid plates 421 arranged along the first direction X can better match the striking direction of the moving contact unit and the stationary contact unit, thereby achieving good arc-initiating and arc-extinguishing effects during the opening and closing of the moving contact 300 and the stationary contact 200.

[0062] In some embodiments, at least a portion of the arc-extinguishing grid plates 421 are provided with arc-initiating plates 430. For example, one or more of the arc-extinguishing grid plates 421 near the contact position between the moving contact 300 and the stationary contact 200 are provided with arc-initiating plates. The arc-initiating plate 430 is arranged at an angle to the arc-extinguishing grid plates 421, with one end fixedly connected to the arc-extinguishing grid plate 421 and the other end extending toward the side near the contact position between the stationary contact 200 and the moving contact 300.

[0063] For example, the arc-starting plate 430 is located on the side of the arc-extinguishing grid plate 421 near the contact position of the stationary contact 200 and the moving contact 300. The arc-starting plate 430 is perpendicular to the arc-extinguishing grid plate 421 and one end is fixedly connected to the arc-extinguishing grid plate 421.

[0064] Optionally, the arc-initiating plate 430 and the arc-extinguishing grid plate 421 are integrally formed.

[0065] The arc-initiating plate 430 makes it easier to capture the electric arc generated between the moving contact 300 and the stationary contact 200, thereby achieving a better arc extinguishing effect.

[0066] When there are two moving contacts 300 and two stationary contacts 200, the two moving contacts 300 correspond one-to-one with the two stationary contacts 200, thus forming the contact positions of the two moving contact units and the stationary contact units. The arc extinguishing grid plate 421 with the arc ignition plate 430 is provided with two arc ignition plates 430, and the two arc ignition plates correspond one-to-one with the two contact positions.

[0067] In this embodiment, by having multiple arc-initiating plates 430 corresponding to multiple contact positions respectively, it can be ensured that the electric arcs generated at multiple contact positions can be guided to the arc-extinguishing grid plate 421.

[0068] In some embodiments, the arc extinguishing cover 410 is provided with a perforated hole 412, which penetrates the arc extinguishing cover 410 along the third direction Z.

[0069] Optionally, the arc extinguishing cover 410 is provided with a plurality of hollow holes 412, and the plurality of hollow holes 412 penetrate the arc extinguishing cover 410 along the third direction Z.

[0070] Optionally, at least one perforated hole 412 is provided between every two adjacent arc-extinguishing grid plates 421.

[0071] The perforated hole 412 allows for connection between the two sides of the arc extinguishing cover 410, thereby preventing charged particles from accumulating on the side of the arc extinguishing cover 410 near the contact position between the moving contact 300 and the stationary contact 200 when an arc is generated. This facilitates the discharge of charged particles and ensures the arc extinguishing effect.

[0072] In some embodiments, the housing 100 is provided with an arc extinguishing hole, which connects the mounting cavity and the outer side of the housing 100 and is disposed adjacent to the arc extinguishing grid plate 421.

[0073] When an electric arc is generated at the stationary contact 200 and the moving contact 300, charged particles accumulate in the cavity. When they reach a certain density in the air, the arc extinguishing effect of the arc extinguishing chamber will deteriorate. By using the arc discharge hole, the air pressure difference between the inside and outside of the outer shell 100 generated by the electric arc can be used to form an airflow, which drives the charged particles out, so as to ensure the arc extinguishing effect of the arc extinguishing chamber.

[0074] This embodiment does not specifically limit the size and shape of the arc extinguishing hole. The size and shape of the arc extinguishing hole can be flexibly determined according to the specific type of load switch and the working environment. If the size is too large, it may cause the arc to spread during the extinguishing process, increasing the safety risk; if the size is too small, it may limit the arc extinguishing speed and affect the arc extinguishing efficiency.

[0075] Optionally, the arc extinguishing hole includes a first through-hole located at a corner of the housing 100 and adjacent to the arc-extinguishing grid. Positioning the first through-hole at the corner of the housing utilizes the spatial advantage of the corner, providing a smoother path for the arc to escape. Inside the load switch, the arc tends to move along the direction of the strongest electric field, and the corner layout helps guide the arc to escape along the edge of the housing 100, reducing the potential threat of the arc to internal components. Furthermore, the corner location is relatively independent, with less interference from other components. This helps ensure that the arc is not obstructed by other components during the extinguishing process, thereby improving the efficiency and safety of arc extinguishing. Moreover, the corners of the housing 100 typically have better heat dissipation conditions because they are more easily exposed to outside air. Positioning the first through-hole at the corner utilizes this heat dissipation advantage, accelerating the heat dissipation process after the arc is extinguished and preventing damage to the housing 100 due to overheating. The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. An arc extinguishing chamber structure for an electric energy meter with a built-in load switch, characterized by, include: An arc-extinguishing chamber, wherein the arc-extinguishing chamber has at least one arc inlet; An arc-extinguishing section is disposed inside the arc-extinguishing cover, and the arc-extinguishing section includes at least an arc-extinguishing grid assembly; The arc-extinguishing grid assembly includes multiple arc-extinguishing grids stacked along the length of the arc-extinguishing shroud; Each arc-extinguishing grid has a bent portion at one end and an arc-inducing groove at the other end; The bent portion is inclined along the length direction of the arc-extinguishing cover; The bent portion is close to the arc inlet end of the arc extinguishing shroud, and the arc-initiating groove is far from the arc inlet end of the arc extinguishing shroud. The arc-extinguishing cover is provided with multiple hollow holes, which penetrate the arc-extinguishing cover along the height direction of the arc-extinguishing cover; and at least one hollow hole is provided between two adjacent arc-extinguishing grid plates.

2. The arc chamber structure of an electric energy meter with a built-in load switch according to claim 1, characterized in that, The arc-extinguishing hood has a U-shaped structure, with a closed end and an arc inlet corresponding to the closed end.

3. The arc chamber structure of claim 1, wherein the arc chamber structure is characterized by: It also includes an arc-initiating plate, which is disposed on one side of the arc-extinguishing section along the length of the arc-extinguishing cover.

Images