Dustproof change-over switch

Abstract

The utility model relates to the technical field of change-over switch, specifically disclose a dustproof change-over switch, including casing, operating handle, be located in the dynamic contact group and static contact group of casing, and the transmission shaft of connecting operating handle and dynamic contact group, operating handle and the through -connection of casing is equipped with the stepped sealing ring, the stepped sealing ring is constituted by the coaxial nesting of the elastic sealing ring of inner layer and the wear -resisting ring of outer layer, improve the dynamic sealing reliability of handle pivot place through stepped double -material sealing ring, effectively block dust invasion core mechanism, detachable magnetic attraction filter screen give consideration to high -efficient dustproof and sustained heat dissipation capacity, avoid the equipment overheating and the capacity of the equipment due to the dust accumulation to reduce, sliding type transparent dust cover design makes contact group maintenance need not integral disassembly switch, greatly shorten the downtime, the whole structure still guarantees stable electrical connection performance under the extreme dust environment, prolong the service life of equipment and reduce the failure risk and maintenance cost in industrial scene.

Description

Technical Field

[0001] This utility model relates to the field of changeover switch technology, and specifically discloses a dustproof changeover switch. Background Technology

[0002] As a core power distribution component, the transfer switch is widely used in power systems, industrial equipment, and building power distribution. Its function is to switch circuit connection states by operating a handle. In typical industrial scenarios such as mines, cement manufacturing, and textile factories, equipment is exposed to high concentrations of dust for extended periods. Such environments pose a severe challenge to the reliability of switches—dust intrusion can lead to electrical performance degradation and even equipment failure. Therefore, dustproof design has become a key technical indicator for industrial-grade transfer switches.

[0003] Although existing dustproof changeover switches generally adopt a housing sealing solution, they still have systemic defects in practical applications:

[0004] Repeated mechanical movement at the handle shaft can easily damage the integrity of the seals. Fine dust can continuously seep in and accumulate in the contact area, causing problems such as arcing and abnormally increased contact resistance, significantly reducing electrical life. The heat dissipation holes designed to control temperature rise become the main channels for dust to enter, and the installation of fixed filters can cause a sharp drop in heat dissipation efficiency due to dust blockage, forcing the equipment to operate at reduced capacity. Cleaning internal dust requires disassembling the entire switch, which is complicated and results in long downtime, causing serious economic losses in continuous production scenarios. Utility Model Content

[0005] This invention proposes a dustproof changeover switch, which significantly improves the dynamic sealing reliability at the handle shaft through a stepped dual-material sealing ring, effectively preventing dust from entering the core mechanism.

[0006] This utility model is implemented as follows: a dustproof changeover switch includes a housing, an operating handle, a moving contact group and a stationary contact group disposed within the housing, and a transmission shaft connecting the operating handle and the moving contact group. A stepped sealing ring is provided at the through connection between the operating handle and the housing. The stepped sealing ring is composed of an inner elastic sealing ring and an outer wear-resistant ring coaxially nested.

[0007] A rear cover is detachably connected to the end of the housing away from the operating handle. Two heat dissipation holes are opened through the outer wall of the rear cover, and dust filters are detachably connected to the inner side of each of the two heat dissipation holes.

[0008] The outer sides of the moving contact group and the stationary contact group are equipped with dust covers, which are movably connected to the inner wall of the housing.

[0009] In a preferred embodiment of the dustproof changeover switch of this utility model, the elastic sealing ring is made of nitrile rubber and the wear-resistant ring is made of polyamide engineering plastic.

[0010] As a preferred embodiment of the dustproof changeover switch of this utility model, the dustproof filter is a sintered metal mesh with a mesh size of 200-400 mesh, and a magnetic ring is fixedly connected to the inner side of the heat dissipation hole, and the dustproof filter is adsorbed and connected to the magnetic ring.

[0011] As a preferred embodiment of the dustproof changeover switch of this utility model, the inner wall of the housing is provided with two symmetrical sliding grooves, and the outer wall of the dustproof cover is fixedly connected with two symmetrically distributed sliders. The two sliders are respectively slidably connected to the inner side of the two sliding grooves, and one end of the sliding groove penetrates the housing and extends to the rear cover.

[0012] As a preferred embodiment of the dustproof changeover switch of this utility model, the dustproof cover has openings at both ends and rubber rings are fixedly connected to the openings on both sides.

[0013] As a preferred embodiment of the dustproof changeover switch of this utility model, the dustproof cover is made of transparent polycarbonate material with a thickness of 1.5-3mm.

[0014] The beneficial effects of this utility model are:

[0015] This invention significantly improves the dynamic sealing reliability of the handle shaft through a stepped dual-material sealing ring, effectively preventing dust from entering the core mechanism; the detachable magnetic filter combines efficient dust prevention with continuous heat dissipation, avoiding overheating and capacity reduction caused by dust accumulation; the sliding transparent dust cover design eliminates the need for complete disassembly of the switch for contact assembly maintenance, greatly reducing downtime; the overall structure maintains stable electrical connection performance even in extreme dust environments, extending equipment lifespan and reducing failure risks and maintenance costs in industrial settings. Attached Figure Description

[0016] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0017] Figure 1 This is a cross-sectional view of the overall structure of this utility model;

[0018] Figure 2 This is a structural diagram of the stepped sealing ring of this utility model;

[0019] Figure 3 This is a right-side view of the casing structure of this utility model.

[0020] The markings in the diagram are: 1. Housing; 2. Operating handle; 3. Drive shaft; 4. Moving contact assembly; 5. Stationary contact assembly; 6. Stepped sealing ring; 7. Elastic sealing ring; 8. Wear-resistant ring; 9. Rear cover; 10. Heat dissipation hole; 11. Dust filter; 12. Dust cover; 13. Magnetic ring; 14. Slide groove; 15. Slider; 16. Rubber ring. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings and specific embodiments to aid in understanding its content. Unless otherwise specified, the methods used in this invention are conventional methods; the raw materials and apparatus used, unless otherwise specified, are conventional commercially available products.

[0022] Please see Figure 1-3 A dustproof changeover switch includes a housing 1, an operating handle 2, a moving contact group 4 and a stationary contact group 5 disposed in the housing 1, and a drive shaft 3 connecting the operating handle 2 and the moving contact group 4. A stepped sealing ring 6 is provided at the through connection between the operating handle 2 and the housing 1. The stepped sealing ring 6 is composed of an inner elastic sealing ring 7 and an outer wear-resistant ring 8 coaxially nested.

[0023] A rear cover 9 is detachably connected to one end of the housing 1 away from the operating handle 2. Two heat dissipation holes 10 are opened through the outer wall of the rear cover 9. Dust filters 11 are detachably connected to the inner side of the two heat dissipation holes 10.

[0024] The moving contact group 4 and the stationary contact group 5 are covered with a dust cover 12, which is movably connected to the inner wall of the housing 1.

[0025] In this embodiment: when the operating handle 2 is rotated, the transmission shaft 3 drives the moving contact group 4 to contact or separate from the stationary contact group 5 to achieve circuit switching. The stepped sealing ring 6 at the connection between the operating handle 2 and the housing 1 achieves dynamic sealing through the elastic deformation of the inner elastic sealing ring 7. The outer wear-resistant ring 8 resists mechanical wear, and double barriers prevent dust from entering from the shaft gap. The heat dissipation hole 10 opened in the rear cover 9 of the housing 1 is equipped with a removable dust filter 11. The metal sintered mesh physically intercepts dust while ensuring airflow exchange. The magnetic ring 13 enables quick removal and cleaning of the filter. The moving contact group 4 and the stationary contact group 5 are protected by a dust cover 12. The slider 15 slides along the slide groove 14 so that the dust cover 12 can be pulled away towards the rear cover 9. The rubber ring 16 seals the opening of the cover. The transparent polycarbonate material makes it easy to observe the internal contact status. The overall structure still ensures stable electrical connection performance in extreme dust environments, extends the service life of the equipment, and reduces the failure risk and maintenance cost in industrial scenarios.

[0026] As a technical optimization of this utility model, the elastic sealing ring 7 is made of nitrile rubber, and the wear-resistant ring 8 is made of polyamide engineering plastic.

[0027] In this embodiment: the nitrile rubber elastic sealing ring 7 is oil-resistant and anti-aging, and the polyamide engineering plastic wear-resistant ring 8 reduces the coefficient of friction and extends the life of the stepped sealing ring 6.

[0028] As a technical optimization of this utility model, the dust filter 11 is a sintered metal mesh with a mesh size of 200-400 mesh, and a magnetic ring 13 is fixedly connected to the inner side of the heat dissipation hole 10. The dust filter 11 and the magnetic ring 13 are attracted and connected.

[0029] In this embodiment: the dust filter 11 is a sintered metal mesh, which is fixed by magnetic ring 13. The mesh size balances dustproof efficiency and air permeability, and it can be disassembled directly without tools during maintenance.

[0030] As a technical optimization of this utility model, the inner sidewall of the housing 1 is provided with two symmetrical sliding grooves 14, and the outer wall of the dust cover 12 is fixedly connected with two symmetrically distributed sliders 15. The two sliders 15 are respectively slidably connected to the inner side of the two sliding grooves 14. One end of the sliding groove 14 passes through the housing 1 and extends to the rear cover 9.

[0031] In this embodiment, the mating structure of the groove 14 and the slider 15 allows the dust cover 12 to be slidably disassembled along the axial direction, so that the entire switch does not need to be disassembled when cleaning the contact assembly.

[0032] As a technical optimization of this utility model, the dust cover 12 has openings at both ends and rubber rings 16 are fixedly connected to the openings on both sides.

[0033] In this embodiment, the rubber ring 16 at the opening of the dust cover 12 compresses and fills the gap in the inner wall of the housing 1, preventing dust from flowing around and entering the cover.

[0034] As a technical optimization of this utility model, the dust cover 12 is made of transparent polycarbonate material with a thickness of 1.5-3mm.

[0035] In this embodiment, the dust cover 12 is made of transparent polycarbonate material, which combines mechanical strength and visibility to monitor the contact arc erosion in real time.

[0036] The working principle and usage process of this utility model: The rotational force of the operating handle 2 is transmitted to the moving contact group 4 through the transmission shaft 3, driving the moving contact and the stationary contact group 5 to close or disconnect the circuit. During operation, the inner elastic sealing ring 7 of the stepped sealing ring 6 at the handle shaft tightly fits the surface of the transmission shaft 3 to form a primary seal, and the outer wear-resistant ring 8 bears the mechanical stress. When the external dust-laden airflow enters through the heat dissipation hole 10 of the rear cover 9, the dust filter 11 intercepts dust particles, and clean air flows into the interior of the housing 1 to dissipate heat. When the dust accumulated on the outer wall of the dust cover 12 needs to be cleaned, the rear cover 9 is opened, and the dust cover 12 is pulled out along the slide groove 14 for easy maintenance and cleaning.

[0037] In the description of this utility model, it should be understood that the terms "left", "right", "up", "down", "top", "bottom", "front", "back", "inner", "outer", "back", "middle", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0038] However, the above description is only a specific embodiment of this utility model and should not be construed as limiting the scope of implementation of this utility model. Therefore, any substitution of equivalent components or equivalent changes and modifications made in accordance with the scope of protection of this utility model should still fall within the scope of the claims of this utility model.

Claims

1. A dustproof changeover switch, comprising a housing (1), an operating handle (2), a moving contact assembly (4) and a stationary contact assembly (5) disposed within the housing (1), and a drive shaft (3) connecting the operating handle (2) and the moving contact assembly (4), characterized in that: The operating handle (2) is provided with a stepped sealing ring (6) at the through connection between the housing (1). The stepped sealing ring (6) is composed of an inner elastic sealing ring (7) and an outer wear-resistant ring (8) coaxially nested. A rear cover (9) is detachably connected to one end of the housing (1) away from the operating handle (2). Two heat dissipation holes (10) are opened through the outer wall of the rear cover (9). Dust filters (11) are detachably connected to the inner side of the two heat dissipation holes (10). The moving contact group (4) and the stationary contact group (5) are covered with dust covers (12), and the dust covers (12) are movably connected to the inner wall of the housing (1).

2. The dustproof changeover switch according to claim 1, characterized in that: The elastic sealing ring (7) is made of nitrile rubber, and the wear-resistant ring (8) is made of polyamide engineering plastic.

3. A dustproof changeover switch according to claim 1, characterized in that: The dust filter (11) is a sintered metal mesh with a mesh size of 200-400. A magnetic ring (13) is fixedly connected to the inner side of the heat dissipation hole (10), and the dust filter (11) is attracted to the magnetic ring (13).

4. A dustproof changeover switch according to claim 1, characterized in that: The inner wall of the housing (1) is provided with two symmetrical sliding grooves (14). The outer wall of the dust cover (12) is fixedly connected with two symmetrically distributed sliders (15). The two sliders (15) are slidably connected to the inner side of the two sliding grooves (14). One end of the sliding groove (14) penetrates the housing (1) and extends to the rear cover (9).

5. A dustproof changeover switch according to claim 1, characterized in that: The dust cover (12) has openings at both ends and rubber rings (16) are fixedly connected to the openings on both sides.

6. A dustproof changeover switch according to claim 1, characterized in that: The dust cover (12) is made of transparent polycarbonate material with a thickness of 1.5-3mm.

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