Arc extinguish chamber cover and low-voltage switch equipment

Abstract

The utility model discloses a wind and sand prevention arc extinguish chamber cover and a low-voltage switch device in the technical field of low-voltage electric appliance component equipment, and the wind and sand prevention arc extinguish chamber cover comprises an arc extinguish chamber top plate, an arc extinguish chamber back plate and arc extinguish chamber side plates, and the arc extinguish chamber top plate, the arc extinguish chamber back plate and the arc extinguish chamber side plates define a semi-open cover body with the bottom and the front part being open. The arc extinguish chamber back plate faces the exhaust hole in the rear side of the arc extinguish chamber and turns backwards when exhausting is conducted through the exhaust hole in the rear side, the low-voltage switch equipment comprises the arc extinguish chamber arranged on the top, the arc extinguish chamber is provided with the backward exhaust hole, the arc extinguish chamber cover is arranged on the arc extinguish chamber in a sleeving mode, and the arc extinguish chamber cover covers the arc extinguish chamber. The problem that in the prior art, exhaust of the arc extinguish chamber of the switch cabinet is affected by sand wind in the desert environment is solved, and the beneficial effects of reasonably utilizing the space, simplifying the structure and ensuring the exhaust function of the arc extinguish chamber are achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of low-voltage electrical component devices, in particular to a wind-sand-proof arc-extinguishing chamber cover for a low-voltage electrical device and a low-voltage switch device. BACKGROUND

[0002] With the rapid development of the new energy power generation industry, the proportion of the photovoltaic industry in the overall energy structure is gradually increasing. The harsh application environment also puts higher requirements on low-voltage electrical components. Deserts, due to the advantages of long sunshine time and strong ultraviolet radiation, have become common places for photovoltaic power generation. In order to ensure good heat dissipation effect, the switch cabinet is usually not closed, and the arc-extinguishing chamber is a key component of the low-voltage electrical component, located directly above the contact system, mainly used for breaking and extinguishing arc, and the gas is discharged from the exhaust port above, behind or on both sides. How to reduce the failure rate of the arc-extinguishing chamber is a problem that needs to be solved at present. SUMMARY

[0003] In view of the deficiencies of the prior art, the present application provides a wind-sand-proof arc-extinguishing chamber cover and a low-voltage switch device to solve the problem of the influence of sand and wind in the desert environment on the exhaust of the arc-extinguishing chamber of the switch cabinet.

[0004] To achieve the above purpose, the present application realizes the following technical scheme:

[0005] An arc-extinguishing chamber cover, comprising an arc-extinguishing cover top plate, an arc-extinguishing cover back plate and an arc-extinguishing cover side plate, the arc-extinguishing cover top plate, the arc-extinguishing cover back plate and the arc-extinguishing cover side plate form a semi-open cover body with an open bottom and front part, and the arc-extinguishing cover back plate is opposite to the exhaust hole on the rear side of the arc-extinguishing chamber and is turned over to the rear side when the exhaust hole on the rear side is exhausted.

[0006] Preferably, the cover body is made of a flexible material, and the turning over to the rear side is a flexible turning over.

[0007] Preferably, the flexible material is rubber.

[0008] Preferably, the arc-extinguishing cover back plate is provided with a screw hole corresponding to the lower end of the arc-extinguishing chamber.

[0009] Preferably, the upper side of the arc-extinguishing cover back plate is provided with a vertical support feature.

[0010] Preferably, the position where the lower end of the arc-extinguishing cover back plate is connected to the arc-extinguishing cover side plate is provided with a horizontal caulking rib corresponding to the gap at the lower end of the arc-extinguishing chamber.

[0011] Preferably, the lower end of the arc-extinguishing cover back plate is provided with a longitudinal caulking rib corresponding to the gap at the lower end of the arc-extinguishing chamber.

[0012] Preferably, the lower end of the arc-extinguishing cover back plate is provided with a horizontal fold line connecting the arc-extinguishing cover side plate.

[0013] Based on the same inventive concept, the application also discloses a low-voltage switch device, comprising an arc-extinguishing chamber arranged on the top, a rear exhaust hole arranged on the arc-extinguishing chamber back plate of the arc-extinguishing chamber, the aforementioned sand-proof arc-extinguishing chamber cover, the arc-extinguishing chamber cover is sleeved on the arc-extinguishing chamber and covers the exhaust hole on the rear side of the arc-extinguishing chamber, and the arc-extinguishing chamber cover is turned over to the rear side when the exhaust hole on the rear side exhausts.

[0014] Preferably, the arc-extinguishing chamber is provided with upward and / or lateral exhaust holes, and the arc-extinguishing cover top plate and the arc-extinguishing cover side plate completely cover the exhaust holes of the arc-extinguishing chamber top plate and the arc-extinguishing chamber side plate.

[0015] The application turns over the flexible arc-extinguishing chamber cover structure arranged behind the arc-extinguishing chamber, the arc-extinguishing chamber cover is sleeved on the arc-extinguishing chamber to wrap the exhaust hole of the arc-extinguishing chamber and prevent the sand from entering when working normally. When the fault current occurs, a large amount of gas is generated, the gas can lift the arc-extinguishing cover on one side to smoothly exhaust, and the arc-extinguishing and breaking failure caused by poor gas exhaust is avoided. The application simplifies the structure, reasonably utilizes the space, reliably prevents the sand from entering the arc-extinguishing chamber, does not affect the exhaust function of the arc-extinguishing chamber, and ensures that the arc-extinguishing chamber can work normally. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a three-dimensional explosion structure schematic diagram of the sand-proof arc-extinguishing chamber cover of the circuit breaker of an embodiment of the application when the sand-proof arc-extinguishing chamber cover is not installed;

[0017] Figure 2 It is a three-dimensional structure schematic diagram of the sand-proof arc-extinguishing chamber cover of an embodiment of the application from the inside perspective;

[0018] Figure 3 It is a schematic diagram of the airflow direction causing the arc-extinguishing chamber cover to turn over in the working state of the sand-proof arc-extinguishing chamber cover of the circuit breaker of an embodiment of the application;

[0019] Figure 4 It is a schematic diagram of the airflow direction of the upward and lateral exhaust holes of the circuit breaker of another embodiment of the application;

[0020] Wherein, 1-arc-extinguishing chamber, 11-arc-extinguishing chamber top plate, 12-arc-extinguishing chamber back plate, 121-exhaust hole, 13-arc-extinguishing chamber side plate, 2-arc-extinguishing chamber cover, 21-arc-extinguishing cover top plate, 22-arc-extinguishing cover back plate, 221-supporting feature, 222-screw hole, 223-transverse caulking rib, 224-longitudinal caulking rib, 225-fold line, 23-arc-extinguishing cover side plate, 3-screw. DETAILED DESCRIPTION

[0021] Clearly, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application.

[0022] Low-voltage switchgear products are applied in windy and sandy environment, and the wind and sand can enter the arc-extinguishing chamber through the exhaust port, and even enter the contact system, which seriously affects the normal operation of the product. The common solution is to directly add a cover outside the arc-extinguishing chamber, but it is easy to affect the exhaust function of the arc-extinguishing chamber.

[0023] The embodiment provides a technical scheme: the arc-extinguishing chamber cover 2 disclosed by the scheme comprises an arc-extinguishing cover top plate 21, an arc-extinguishing cover back plate 22 and an arc-extinguishing cover side plate 23, the arc-extinguishing cover top plate 21, the arc-extinguishing cover back plate 22 and the arc-extinguishing cover side plate 23 form a semi-open cover body with an open bottom and front part, the arc-extinguishing cover back plate 22 is opposite to and closes the exhaust hole 121 at the rear side of the arc-extinguishing chamber 1 and is turned over to the rear side when the exhaust hole 121 at the rear side exhausts, so that the arc-extinguishing cover back plate 22 is away from the exhaust hole 121 at the rear side of the arc-extinguishing chamber 1. The turning over can be rigid turning over or flexible turning over, the arc-extinguishing chamber cover 2 can use a rigid material such as plastic, a rotating shaft hole is arranged at both ends of the arc-extinguishing chamber 1 and a shaft-shaped feature is arranged on the inner side of the arc-extinguishing cover side plate 23 and is loaded into the shaft hole to achieve the purpose of rigid turning over, and a reset device such as a torsional spring can be additionally arranged at the shaft, so that the arc-extinguishing chamber cover 2 can be automatically reset after exhaust, but the structure is slightly complex, and the embodiment adopts a flexible turning over mode, that is, the cover body adopts a flexible material, and the turning over to the rear side is flexible turning over. The flexible material in the embodiment adopts relatively soft rubber, and other suitable flexible materials such as silica gel can also be adopted. The structure has the wind and sand prevention function and smooth exhaust.

[0024] The lower end of the arc-extinguishing cover back plate 22 in the embodiment is provided with a screw hole 222 corresponding to the lower end of the arc-extinguishing chamber 1, and four screws 3 can be used to fix one end of the wind and sand prevention cover 2, that is, the lower end of the arc-extinguishing cover back plate 22 at the lower end position of the arc-extinguishing chamber, so that the arc-extinguishing chamber cover 2 can be turned over around the lower end of the arc-extinguishing cover back plate 22. In addition to the screw fixing mode, other suitable modes such as clamping or gluing can also be used to install the arc-extinguishing chamber cover 2.

[0025] In order to make the gas exhaust more smooth, the upper side of the arc-extinguishing cover back plate 22 in the embodiment is provided with a plurality of vertical support features 221, so that a certain gap is left between the arc-extinguishing cover back plate 22 and the rear exhaust port of the arc-extinguishing chamber 2, and the gas can slightly uniformly push the arc-extinguishing chamber cover 2 as a whole.

[0026] In order to make the arc-extinguishing chamber cover 2 more fit the low-voltage switchgear body and better seal the gap, the embodiment is further provided with horizontal plug joint ribs 223 corresponding to the lower end gap of the arc-extinguishing chamber 1 at the position where the arc-extinguishing chamber back plate 22 is connected to the arc-extinguishing chamber side plate 23, and is further provided with a plurality of longitudinal plug joint ribs 224 corresponding to the lower end gap of the arc-extinguishing chamber 1 at the lower end of the arc-extinguishing chamber back plate 22. After the arc-extinguishing chamber cover 2 is installed, these plug joint ribs can block the corresponding gap of the low-voltage switchgear body.

[0027] In order to make the arc-extinguishing chamber cover 2 more fit the low-voltage switchgear body and better seal the gap, the embodiment is further provided with horizontal plug joint ribs 223 corresponding to the lower end gap of the arc-extinguishing chamber 1 at the position where the arc-extinguishing chamber back plate 22 is connected to the arc-extinguishing chamber side plate 23, and is further provided with a plurality of longitudinal plug joint ribs 224 corresponding to the lower end gap of the arc-extinguishing chamber 1 at the lower end of the arc-extinguishing chamber back plate 22. After the arc-extinguishing chamber cover 2 is installed, these plug joint ribs can block the corresponding gap of the low-voltage switchgear body.

[0028] Based on the same inventive concept, the application further discloses a low-voltage switchgear embodiment. The low-voltage switchgear can be a disconnector or a circuit breaker with a controller, such as Figure 1 As shown in the figure, the embodiment is a universal circuit breaker, which comprises an arc-extinguishing chamber 1 arranged at the top, a rear exhaust hole 121 arranged on the arc-extinguishing chamber back plate 12 of the arc-extinguishing chamber 1, and the aforementioned sand-proof arc-extinguishing chamber cover 2. The arc-extinguishing chamber cover 2 is sleeved on the arc-extinguishing chamber 1 and the inner side of the arc-extinguishing chamber back plate 22 faces and closes the rear exhaust hole 121 of the arc-extinguishing chamber 1, and is turned over to the rear side when the rear exhaust hole 121 of the arc-extinguishing chamber 1 exhausts. Different-pole circuit breakers have slightly different exhaust holes 121. For example, a four-pole circuit breaker is provided with a lateral exhaust hole 121, and a three-pole circuit breaker is provided with upward and lateral exhaust holes 121. The lateral exhaust hole 121 can be used for exhaust or as a handle, serving as a hanging point of a lifting hook. Since the upward and lateral exhaust holes 121 are also subjected to sand and wind, the arc-extinguishing chamber top plate 21 and the arc-extinguishing chamber side plate 23 of the arc-extinguishing chamber cover 2 of the embodiment completely cover the exhaust holes 121 of the arc-extinguishing chamber top plate 11 and the arc-extinguishing chamber side plate 13 after installation.

[0029] During installation, the arc-extinguishing chamber cover 2 is sleeved on the product arc-extinguishing chamber 1 from the top, and then is fixed on the product through a plurality of rear screws 3, which is simple and convenient. During work, the sand-proof arc-extinguishing chamber cover 2 mainly blocks the exhaust holes at the upper end, the rear end and the two ends of the arc-extinguishing chamber 1 to prevent the entry of sand and wind. When the low-voltage switchgear product generates a large amount of airflow, the airflow direction is the upper end, the rear end and the two sides of the arc-extinguishing chamber. At this time, the sand-proof arc-extinguishing chamber cover 2 is pushed and turned over to the rear side, and is separated from the product, so that the gas is smoothly discharged, ensuring the normal work of the low-voltage switchgear product. After the gas is discharged, the arc-extinguishing chamber cover 2 is slightly reset by the elasticity of the rubber flexible material, and is completely reset by manual when the obstacle is manually removed, so that it continues to play the role of blocking sand and wind.

[0030] In the description of the application, it needs to be explained that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, which are only for the convenience of describing the application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the application. In addition, terms such as "first", "second" and the like are used only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0031] The above is only the preferred specific implementation of the present application, but the protection scope required by the present application is not limited to this. Any person skilled in the art can make equivalent replacements or changes within the technical scope disclosed in the present application according to the technical scheme and inventive concept of the present application, which should be covered within the protection scope of the present application.

Claims

1. An arc quenching chamber cover, characterized by: The arc-extinguishing cover includes a top plate (21), a back plate (22) and side plates (23), which form a semi-open cover with an open bottom and front, the back plate (22) faces the exhaust hole (121) at the back of the arc-extinguishing chamber (1) and turns to the back when the exhaust hole (121) exhausts.

2. The arc chute cover of claim 1, wherein: The cover is made of flexible material, and the turning to the back is a flexible turning.

3. The arc chute cover of claim 2, wherein: The flexible material is rubber.

4. The arc chute cover of claim 1, wherein: The lower end of the back plate (22) is provided with a screw hole (222) corresponding to the lower end of the arc-extinguishing chamber (1).

5. The arc chute cover of claim 1, wherein: The upper side of the back plate (22) is provided with vertical support features (221).

6. The arc chute cover of claim 1, wherein: The position where the lower end of the back plate (22) connects the side plates (23) is provided with a horizontal caulking rib (223) corresponding to the gap at the lower end of the arc-extinguishing chamber (1).

7. The arc chute cover of claim 1, wherein: The lower end of the back plate (22) is provided with a longitudinal caulking rib (224) corresponding to the gap at the lower end of the arc-extinguishing chamber (1).

8. The arc chute cover of claim 1, wherein: The lower end of the back plate (22) is provided with a horizontal fold (225) connecting the side plates (23).

9. A low voltage switchgear comprising an arc chute (1) arranged at the top, a back plate (12) of the arc chute (1) is provided with rear exhaust holes (121), characterized in that: The arc-extinguishing chamber cover (2) of any one of claims 1-8 is further provided, which is sleeved on the arc-extinguishing chamber (1) and the inner side of the back plate (22) faces and completely covers the exhaust hole at the back of the arc-extinguishing chamber (1), and turns to the back when the exhaust hole exhausts.

10. The low voltage switchgear according to claim 9, characterized in that: The arc-extinguishing chamber (1) is provided with upward and / or lateral exhaust holes (121), and the top plate (21) and the side plates (23) of the arc-extinguishing cover completely cover the exhaust holes of the top plate (11) and the side plates (13) of the arc-extinguishing chamber.

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