Sand-proof device for switch
By designing a wind and sand protection device for the bracket and shield, the problem of the circuit breaker's vent being blocked by sand in a windy and sandy environment was solved, achieving reliable and efficient venting of the circuit breaker, and facilitating disassembly and replacement, thus reducing maintenance costs.
Patent Information
- Application Number
- CN202520221762.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-12
- Publication Date
- 2025-12-30
- Estimated Expiration
- 2035-02-12
AI Technical Summary
In windy and sandy environments, existing circuit breakers are prone to having sand and dust enter their outlets, leading to malfunctions such as poor connection and failure to open the circuit, thus affecting equipment reliability.
A wind and sand protection device including a bracket and a shield is designed. The shield seals the air outlet during normal operation and detaches to allow gas to escape in case of failure. The bracket adopts a snap-fit structure for easy assembly and disassembly, and the shield is made of flexible material.
It effectively prevents sand and dust from entering, ensuring the reliability of the switch and the venting effect, while improving assembly efficiency and reducing costs.
Smart Images
Figure CN223743564U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of low-voltage electrical technology, specifically relating to a wind and sand protection device for switches. Background Technology
[0002] With the increasing use of switching devices, such as low-voltage circuit breakers, in new energy applications, their application environment is also constantly changing. In particular, the expansion of the solar photovoltaic industry into desert areas has brought about significant changes in the operating environment of circuit breakers, and the problem of wind and sand has become a prominent issue.
[0003] The circuit breaker housing contains a contact system. The opening and closing of the circuit is controlled by the separation and closure of the moving and stationary contacts. When the moving and stationary contacts separate, an electric arc is generated between them. This arc is forced into an arc-extinguishing device, also located inside the circuit breaker housing, by means of air blowing or magnetic blowing. The high-temperature metallic gas generated by the arc is discharged outside the circuit breaker through an outlet located behind the arc-extinguishing device. In existing technology, the circuit breaker's outlet is exposed. In windy and sandy environments, sand can easily enter the circuit breaker through the outlet, causing various faults such as poor circuit breaker connection and mechanism failure to open. The outlet is the only channel connecting the inside and outside of the circuit breaker. Therefore, researching a wind and sand protection structure at the outlet has certain application value. The applicant has made a beneficial design, and the technical solution described below arose in this context. Utility Model Content
[0004] The purpose of this utility model is to provide a wind and sand protection device for switches, which has a good dust and sand protection effect to ensure the reliability of the switches, and the wind and sand protection device can be disassembled and replaced to improve assembly efficiency.
[0005] The purpose of this utility model is achieved as follows: a windproof and sandproof device for a switch includes a bracket that is clipped to the switch and a shielding member that is pasted to the bracket. The shielding member closes the air outlet of the switch. When the gas generated inside the switch acts on the shielding member, the shielding member detaches or partially detaches from the bracket to allow the gas to be discharged to the outside of the switch through the air outlet.
[0006] In a specific embodiment of this utility model, the bracket includes a bracket wall that completely covers the air outlet in size. The bracket wall has a bracket vent, and a snap-fit member is provided on the side of the bracket wall facing the air outlet. The shielding member is attached to the other side of the bracket wall facing away from the air outlet.
[0007] In another specific embodiment of this utility model, the switch has a housing, the air outlet is formed by a housing vent on the housing; the snap-fit is integrally formed by the bracket wall, and the snap-fit extends into the housing from the housing vent and hooks with the inner wall of the housing to realize the snap-fit of the bracket.
[0008] In another specific embodiment of this utility model, the snap-fit component consists of two pairs of snap-fit feet respectively disposed on the upper and lower sides of the support wall. The front surface of the snap-fit foot end is formed with a front buffer slope, and the rear surface of the snap-fit foot end is formed with a rear buffer slope.
[0009] In another specific embodiment of this utility model, the offset angle α of the front buffer ramp is greater than or equal to 45°, and the offset angle β of the rear buffer ramp is less than or equal to 45°.
[0010] In another specific embodiment of this utility model, a sealing element is also included. The sealing element is frame-shaped and is pasted on the side of the bracket wall facing the housing. After the bracket is snapped into the switch, the sealing element is in contact with the housing surface around the air outlet.
[0011] In a further specific embodiment of this utility model, the support wall forms a positioning flange on the bottom edge facing the switch, and the positioning flange is used to cooperate with the protruding rib on the housing located below the air outlet.
[0012] In a further specific embodiment of this utility model, the shielding member is a flexible member.
[0013] Due to the aforementioned structure, this utility model has the following advantages compared to the prior art: During normal operation with the switch connected to the circuit, the shielding component seals the switch's vent, effectively preventing sand, dust, or other foreign matter from entering the switch from the outside, thus ensuring the switch's reliability. When a circuit fault occurs and the switch's moving and stationary contacts separate to disconnect the circuit, the gas generated inside the switch impacts the shielding component, causing it to detach or partially detach from the bracket, allowing the gas to be discharged to the outside of the switch through the vent, ensuring the switch's venting effect. Furthermore, the bracket adopts a snap-fit structure, with the shielding component adhered to the bracket, facilitating easy disassembly and replacement of the bracket and / or shielding component on the switch, improving assembly efficiency, saving costs, and resulting in a simple and reasonable structure. Attached Figure Description
[0014] Figure 1 This is a schematic diagram of the assembly of the present invention with a molded case circuit breaker;
[0015] Figure 2 This is an assembly diagram of the present invention.
[0016] In the diagram: 1. Switch, 10. Housing, 100. Housing vent, 11. Air outlet, 111. Housing surface, 112. Rib; 2. Bracket, 21. Bracket wall, 211. Positioning flange, 22. Snap-fit, 221. Front buffer slope, 222. Rear buffer slope, 23. Bracket vent; 3. Shielding component; 4. Sealing component. Detailed Implementation
[0017] The specific embodiments of this utility model are described in detail below with reference to the accompanying drawings. However, the description of the embodiments is not a limitation on the technical solution. Any formal but not substantive changes made based on the concept of this utility model should be considered within the protection scope of this utility model.
[0018] In the following description, all directional (or orientational) concepts involving up, down, left, right, front, and back refer to the position of the figure being described, and are intended to facilitate public understanding. Therefore, they should not be construed as a special limitation on the technical solution provided by this utility model.
[0019] This utility model relates to a windproof and sandproof device for switches. The switch can be a circuit breaker, or an electrical device with an air outlet on its housing, such as a disconnect switch or a rotary switch.
[0020] See Figure 1 The aforementioned wind and sand protection device for the switch includes a bracket 2 that is clipped onto the switch 1 and a shielding member 3 that is pasted onto the bracket 2. In the normal operating state where the switch 1 is connected to the circuit, the shielding member 3 seals the air outlet 11 of the switch 1 to prevent wind, sand, dust, or other foreign objects from entering the switch 1 from the outside and affecting its operation. Gas generated inside the switch 1 acts on the shielding member 3, causing it to detach or partially detach from the bracket 2, allowing the gas to be discharged to the outside of the switch 1 through the air outlet 11. In this embodiment, a circuit breaker is used as an example. When a circuit fault occurs, the circuit breaker operates, separating its moving and stationary contacts, generating an electric arc between them. The high-temperature metallic gas generated by the arc acts on the shielding member 3. The shielding member 3 is preferably a flexible component, such as reinforced nylon sheet, PET sheet, or high-temperature flame-retardant cardboard.
[0021] Furthermore, the switch 1 has a housing 10, and the air outlet 11 is formed by a housing vent 100 formed on the housing 10. The bracket 2 includes a bracket wall 21, which is sized to completely cover the air outlet 11. The bracket wall 21 extends on the side facing the air outlet 11 and forms a snap-fit member 22. The snap-fit member 22 extends from the housing vent 100 into the interior of the housing 10 and engages with the inner wall of the housing 10 to achieve the snap-fit of the bracket 2, thereby realizing the installation of the windproof and sandproof device and the switch 1. The shielding member 3 is attached to the other side of the bracket wall 21 opposite to the air outlet 11.
[0022] In this embodiment, the snap-fit component 22 consists of two pairs of snap-fit feet respectively disposed on the upper and lower sides of the support wall 21. Specifically, as shown in the figure... Figure 1 and Figure 2As shown, the locking feet are integrally formed by extending the bracket wall 21, with one pair each formed above and below the surface of the bracket wall 21 facing the air outlet 11. A front buffer slope 221 is formed on the front surface of the locking foot end, and a rear buffer slope 222 is formed on the rear surface of the locking foot end. The offset angle α of the front buffer slope 221 is greater than or equal to 45°, and the offset angle β of the rear buffer slope 222 is less than or equal to 45°. The function of the front buffer slope 221 is to facilitate the locking of the bracket 2 onto the housing 10. The purpose of setting the offset angle β of the rear buffer slope 222 to less than or equal to 45° is to ensure that the bracket 2 is locked onto the housing 10 without falling off, while also allowing for easy removal of the bracket 2 from the housing 10 when necessary. Of course, the locking member 22 is not limited to the two pairs of locking feet shown in the above embodiment; it can also be one pair or three pairs, as long as it achieves the goal of locking the bracket 2 onto the housing 10 without it falling off. Bracket 2 utilizes a snap-fit structure, which allows for easy disassembly and replacement, improving assembly efficiency and saving costs.
[0023] Furthermore, the bracket wall 21 forms a positioning flange 211 at the bottom edge facing the switch 1. The positioning flange 211 is used to cooperate with the protruding rib 112 on the housing 10 located below the air outlet 11. Specifically, when the bracket 2 is snapped onto the switch 1, the upper surface of the positioning flange 211 fits against the bottom surface of the protruding rib 112, thereby positioning the windproof and sandproof device with the switch 1.
[0024] Furthermore, this utility model also includes a sealing element 4, which is frame-shaped and is attached to the side of the bracket wall 21 facing the housing 10. After the bracket 2 is snapped into the switch 1, the sealing element 4 fits against the housing surface 111 around the air outlet 11 to seal the gap left after the bracket 2 is snapped into the air outlet 11, effectively ensuring the wind and sand protection performance of the switch 1.
[0025] Furthermore, a vent 23 is provided on the support wall 21. In this embodiment, there are multiple housing vents 100 of the switch 1, which are elongated through holes extending in the height direction of the circuit breaker. There are also multiple support vents 23, which are also elongated through holes extending in the height direction of the circuit breaker. Moreover, the housing vents 100 and the support vents 23 overlap, that is, they are aligned. Of course, it is not limited to the above embodiment. The support vent 23 can be a single vent, which can be expanded to the entire support wall 21, that is, the support wall 21 becomes a frame structure, and the four sides of the frame are attached to the shielding member 3.
[0026] Furthermore, adhesive can be applied to the surface of the support wall 21 facing the shield 3 to completely adhere the shield 3 to the surface of the support wall 21. When the gas inside the switch 1 flows through the housing vent 100 and the support vent 23 and acts on the shield 3, it will cause the shield 3 to detach from the support wall 21, thus allowing the gas to be smoothly discharged from the switch 1. Preferably, as follows... Figure 2 As shown, adhesive can be applied only to the surface of the bracket wall 21 below the bracket vent 23. The shielding member 3 is then attached to the bracket wall 21 using this adhesive. There is no constraint between the surface of the bracket wall 21 with the bracket vent 23 and the shielding member 3. When the gas inside the switch 1 flows through the housing vent 100 and the bracket vent 23 and acts on the shielding member 3, it will flexibly bend. At this time, the part of the shielding member 3 not attached to the bracket wall 21 will detach from the bracket wall 21, while the lower part of the shielding member 3 still firmly adheres to the bracket wall 21. This partially detaches the shielding member 3 from the bracket wall 21, allowing the gas to escape smoothly to the outside of the switch 1 and ensuring the venting effect of the switch 1. Of course, the adhesive application location is not limited to the bracket wall 21; it can also be the surface of the shielding member 3 facing the bracket wall 21.
[0027] This invention can effectively prevent foreign objects such as wind, sand or dust from entering the interior of switch 1 from the outside, thereby ensuring the reliability of switch 1 and achieving the purpose of the invention.
Claims
1. A wind and sand protection device for a switch, characterized by: The bracket (2) is clamped to the switch (1), and the shielding piece (3) is pasted to the bracket (2), the shielding piece (3) closes the gas outlet (11) of the switch (1), when the gas generated in the switch (1) acts on the shielding piece (3), the shielding piece (3) is separated or partially separated from the bracket (2) to allow the gas to be discharged to the outside of the switch (1) through the gas outlet (11).
2. A wind and sand protection device for a switch according to claim 1, characterized in that: The bracket (2) comprises a bracket wall (21) which completely covers the gas outlet (11) in size, the bracket wall (21) is provided with a bracket air vent (23), and the bracket wall (21) is provided with a clamping piece (22) on the side facing the gas outlet (11), and the shielding piece (3) is pasted to the other side of the bracket wall (21) away from the gas outlet (11).
3. A wind and sand protection device for a switch according to claim 2, characterized in that: The switch (1) has a housing (10), the gas outlet (11) is formed by a housing air vent (100) formed on the housing (10), the clamping piece (22) is formed by integral extension of the bracket wall (21), and the clamping piece (22) is inserted into the housing (10) from the housing air vent (100) to be hooked with the inner wall of the housing (10) to realize clamping of the bracket (2).
4. A wind and sand protection device for a switch according to claim 3, characterized in that: The clamping piece (22) is two pairs of clamping legs arranged on the upper side and the lower side of the bracket wall (21), the front surface of the end of the clamping leg is formed with a front buffer inclined surface (221), and the rear surface of the end of the clamping leg is formed with a rear buffer inclined surface (222).
5. A wind and sand protection device for a switch according to claim 4, characterized in that: The bias angle α of the front buffer inclined surface (221) is greater than or equal to 45°, and the bias angle β of the rear buffer inclined surface (222) is less than or equal to 45°.
6. A wind and sand protection device for a switch according to claim 3, characterized in that: Further comprising a sealing piece (4), the sealing piece (4) is in a frame type, and is pasted to the side of the bracket wall (21) facing the housing (10), after the bracket (2) is clamped to the switch (1), the sealing piece (4) is attached to the housing surface (111) around the gas outlet (11).
7. A wind and sand protection device for a switch according to claim 3, characterized in that: The bracket wall (21) is formed with a positioning flange (211) at the bottom edge and facing the switch (1), and the positioning flange (211) is used for cooperating with the convex rib (112) on the housing (10) below the gas outlet (11).
8. A wind and sand protection device for a switch according to claim 1, characterized in that: The shielding piece (3) is a flexible piece.