Change-over switch
By employing a lead screw drive mechanism and a moving contact with a double contact plate design in the changeover switch, combined with cover plate protection, the reliability and lifespan issues in cold and windy sandy areas are solved, resulting in a changeover switch with simple structure, stable and reliable performance, and good protection.
Patent Information
- Application Number
- CN202520134665.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-20
- Publication Date
- 2026-01-16
- Estimated Expiration
- 2035-01-20
AI Technical Summary
Existing changeover switches are prone to malfunctioning in cold and windy areas due to air pipe failures or poor contact, resulting in a short service life.
The drive mechanism with a lead screw structure and the moving contact with a double contact plate design, combined with the protection of the cover plate, ensures the reliability of the drive and the reliability of the contact. The operational reliability is further improved by the guide rod and the micro switch.
It improves the structural simplicity, performance stability, and service life of the changeover switch, provides good protection, prevents impurities from entering, and ensures reliable contact and long life of the contact system.
Smart Images
Figure CN223809032U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to low voltage electric appliance technical field, concretely relates to a change-over switch. BACKGROUND
[0002] Change-over switch is a kind of low voltage switch that switches multiple circuits. Multiple moving contacts are welded on the shaft, and when the shaft rotates, the moving contacts are connected or disconnected with static contacts in turn to switch circuits. It is an electric appliance that changes circuit from one connection to another. At present, most locomotives use change-over switches with exposed contacts, and the action mechanism is driven by air, controlled by air valve. When impurities are mixed in the air pipeline, or in the high and cold regions of the north, water vapor is easily produced in the air pipeline in winter, and then frozen, causing air valve failure or air pipeline blockage, and thus the change-over switch cannot work normally. At the same time, in the northeast and northwest regions with strong wind and sand, wind and sand are easily attached to the surface of the contacts of the change-over switch, causing poor contact of the contacts, and when passing through large current, it is easy to cause arc and even burn the contacts, and the service life is short. SUMMARY
[0003] The utility model aims at overcoming the defects of prior art, and provides a change-over switch with simple structure, stable and reliable performance, good protection performance and long service life.
[0004] To achieve the above-mentioned purpose, the utility model adopts a change-over switch, which comprises a base, a contact system arranged on the base, a driving mechanism arranged on the base and used for driving the contact system to perform opening and closing actions, and a cover plate arranged on the base. The cover plate covers the contact system and the driving mechanism. The driving mechanism comprises a motor, a screw rod linked with the motor, and a nut arranged on the screw rod. The contact system comprises a static contact seat arranged in the base, multiple static contacts arranged on the static contact seat respectively, a moving contact frame slidingly arranged in the base and linked with the nut, and multiple moving contacts linked with the moving contact frame and matched with the multiple static contacts. The moving contacts comprise two moving contact pieces arranged in the contact hole of the moving contact frame, a pad arranged between the two moving contact pieces, and two elastic pieces arranged between the two moving contact pieces and the moving contact frame respectively. Contact clamping spaces matched with the static contacts are formed between the two ends of the two moving contact pieces.
[0005] The beneficial effects of the above structure are that: the driving mechanism adopts a screw rod structure design, which can ensure that the driving mechanism can reliably drive the contact system to perform the opening and closing actions, thereby facilitating to improve the working reliability of the switch, and the cover plate can play a protection role, which can avoid impurities such as sand and dust from falling into the driving mechanism or the contact system, and the protection performance is better. The moving contact adopts a double contact piece structure design, when the moving contact and the static contact are in contact during the working of the switch, the two moving contact pieces are clamped on the two sides of the static contact, which ensures reliable contact and extremely small contact resistance, and the service life of the contact system is longer. Therefore, the switch has the advantages of simple structure, stable and reliable performance, good protection performance, and long service life.
[0006] In particular, the base is provided with a guide rod matched with the moving contact frame, the moving contact frame is provided with a guide hole, the guide rod is inserted into the guide hole, and the sliding connection of the moving contact frame and the guide rod is formed. The guide rod plays a guiding role on the moving contact frame, thereby ensuring that the moving contact frame can reliably act, and facilitating to improve the working reliability of the switch.
[0007] In particular, the moving contact frame is movably provided with a trigger plate, the static contact seat is provided with a micro switch matched with the trigger plate, the trigger plate moves with the moving contact frame and triggers the micro switch, and the micro switch is turned on or turned off. The moving contact frame triggers the micro switch through the trigger plate, thereby ensuring that the moving contact frame can reliably trigger the micro switch, thereby facilitating to improve the working reliability of the switch.
[0008] In particular, a plurality of limiting bosses are arranged on the two moving contact pieces respectively and abut against both ends of the pad, and the limiting cooperation of the plurality of limiting bosses and the pad is formed. The moving contact pieces abut against the pad through the limiting bosses, thereby ensuring that the connection of the two moving contacts, the pad and the moving contact frame is more compact.
[0009] In particular, the nut is movably provided with a clamping plate, the moving contact frame is provided with a clamping hole matched with the clamping plate, the clamping plate is clamped in the clamping hole, and the clamping connection of the clamping plate and the moving contact frame is formed. The nut is clamped with the moving contact frame through the clamping plate, thereby facilitating the assembly of the nut and the moving contact frame, the assembly is more convenient, and the transmission of the nut and the moving contact frame is more reliable. BRIEF DESCRIPTION OF DRAWINGS
[0010] Figure 1 It is a perspective view of an embodiment of the utility model.
[0011] Figure 2 It is an internal structure view of an embodiment of the utility model.
[0012] Figure 3 It is an exploded view of an embodiment of the utility model.
[0013] Figure 4A perspective view of the moving contact frame of the embodiment of the present application. DETAILED DESCRIPTION
[0014] As Figures 1-4 shown, the utility model embodiment is a change -over switch, including base 10, setting on base 10 contact system 20, setting on base 10 and being used for driving contact system 20 to carry out the drive mechanism 30 of opening and closing, setting on base 10 cover plate 11, the cover plate 11 of contact system 20, drive mechanism 30 is covered, the drive mechanism 30 includes motor 31, with the linkage cooperation screw rod 32 of motor 31, setting on screw rod 32 nut 33, contact system 20 include setting in base 10 static contact seat 21, respectively setting on multiple static contact head 22 of static contact seat 21, sliding setting in base 10 and with the linkage cooperation nut 33 of moving contact frame 23, linkage setting on moving contact frame 23 and with multiple static contact head 22 cooperation multiple moving contact head 24, the moving contact head 24 includes setting in the contact hole 231 of moving contact frame 23 two moving contact piece 241, setting between two moving contact piece 241 pad plate 242, respectively setting between two moving contact piece 242 and moving contact frame 23 two elastic sheet 243, two moving contact piece 241 both ends between forming with static contact head 22 cooperation contact clamping space 2410.
[0015] As Figure 2 , 3The base 10 is provided with a guide rod 101 matched with the moving contact holder 23, the moving contact holder 23 is provided with a guide hole 232, the guide rod 101 is inserted into the guide hole 232 and forms the sliding connection of the moving contact holder 23 and the guide rod 101. The guide rod plays a guiding role on the moving contact holder, so that the reliable action of the moving contact holder can be ensured, and the working reliability of the switch is improved. The moving contact holder 23 is provided with a trigger plate 25, the static contact seat 21 is provided with a micro switch 26 matched with the trigger plate 25, the trigger plate 25 moves with the moving contact holder 23 and triggers the micro switch 26, so that the micro switch 26 is turned on or turned off. The moving contact holder triggers the micro switch through the trigger plate, so that the reliable triggering of the micro switch by the moving contact holder can be ensured, and the working reliability of the switch is improved. The two moving contact pieces 241 are provided with a plurality of limiting bosses 2411 abutting on both ends of the backing plate 242, and the limiting bosses 2411 and the backing plate 242 are limitedly matched. The moving contact pieces abut on the backing plate through the limiting bosses, so that the connection of the two moving contact heads, the backing plate and the moving contact holder is more compact. The nut 33 is provided with a clamping plate 34, the moving contact holder 23 is provided with a clamping hole 233 matched with the clamping plate 34, the clamping plate 34 is clamped in the clamping hole 233, and the clamping plate 34 and the moving contact holder 23 are clamped and matched. The nut is clamped with the moving contact holder through the clamping plate, so that the assembly of the nut and the moving contact holder is convenient, the assembly is more convenient, and the transmission of the nut and the moving contact holder is more reliable.
[0016] The driving mechanism adopts a screw rod structure design, which can ensure that the driving mechanism can reliably drive the contact system to perform the opening and closing action, so that the working reliability of the switch is improved, and the cover plate can play a protection role, which can prevent sand and other impurities from falling into the driving mechanism or the contact system, and the protection performance is better. The moving contact head adopts a double contact piece structure design. When the switch works, the moving and static contact heads contact the static contact head, the two moving contact pieces are clamped on both sides of the static contact head, the reliable contact is ensured, the contact resistance is extremely small, and the service life of the contact system is longer. Therefore, the switch has the advantages of simple structure, stable and reliable performance, good protection performance and long service life.
Claims
1. A changeover switch characterised in that: The utility model relates to a circuit breaker, including base, the contact system that sets up on the base, set up on the base and be used for driving contact system to carry out the drive mechanism of on -off action, set up on the base cover, the cover of contact system, drive mechanism, the drive mechanism includes motor, with the screw rod that motor links together, set up on the screw rod, the nut of the contact system includes set up in the base static contact seat, set up respectively on static contact seat a plurality of static contact, slidingly set up in the base and with the nut linkage cooperation's dynamic contact frame, linkage set up on dynamic contact frame and with a plurality of static contact cooperation's a plurality of dynamic contact, the dynamic contact includes set up in the contact hole of dynamic contact frame two dynamic contact piece, set up between two dynamic contact piece the backing plate, set up respectively between two dynamic contact piece and dynamic contact frame two elastic sheet, two dynamic contact piece both ends form with static contact cooperation's contact clamping space.
2. The switch according to claim 1, characterized in that: The base is provided with a guide rod matched with the dynamic contact frame, the dynamic contact frame is provided with a guide hole, the guide rod is inserted into the guide hole, and the sliding connection of the dynamic contact frame and the guide rod is formed.
3. The switch according to claim 1 or 2, characterized in that: The dynamic contact frame is linked with a trigger plate, the static contact seat is provided with a micro switch matched with the trigger plate, the trigger plate moves with the dynamic contact frame and triggers the micro switch, and the micro switch is turned on or turned off.
4. The switch according to claim 1 or 2, characterized in that: A plurality of limiting bosses are arranged on the two dynamic contact pieces and abut against the two ends of the backing plate, and the limiting cooperation of the plurality of limiting bosses and the backing plate is formed.
5. The switch according to claim 1 or 2, characterized in that: The nut is linked with a clamping plate, the dynamic contact frame is provided with a clamping hole matched with the clamping plate, the clamping plate is clamped into the clamping hole, and the clamping cooperation of the clamping plate and the dynamic contact frame is formed.