Patent Publication Number: US-2015075955-A1

Title: Reversing Switch

Description:
TECHNICAL FIELD OF THE INVENTION  
     The present disclosure relates to the field of switch technology of electrical system, and more particularly to a reversing switch. 
     BACKGROUND OF THE INVENTION  
     Currently, there are basically two major types of positive and negative rotation mechanisms adopted by the reversing switch on the market: 
     The first type is an electronic positive and negative rotation mechanism, which realizes the function of positive and negative rotation of a motor through connection of electronic circuits. 
     The second type is a mechanical positive and negative rotation mechanism, which realizes the function of positive and negative rotation of a motor through connection of mechanical structures. 
     The former type is rarely applied because of high cost, while the latter type is widely applied because of lower cost and easy implementation. 
     Wherein, the mechanical positive and negative rotation mechanism further includes a side contact type: relative to the working parts of a positive and negative rotation connection component, the corresponding working parts of an input end 1, an input end 2, an output end 1 and an output end 2 are all located at a side thereof. This type of positive and negative rotation mechanism has the following problems: each loop (e.g. the input end 1 (2), the positive and negative rotation connection component, and the output end 1 (2) constitute a loop) is connected via a separate positive and negative rotation connection component, which means there is only a single connection contact point in each loop. It is well known that there is a contact resistance in the connection part of each loop, and the contact resistance depends on the size of the contact area under the condition of identical materials and equal contact pressure etc. The larger the contact resistance is, the larger the internal resistance of the loop (the internal resistance of the loop=the material internal resistance+the contact resistance) will be. In case of electricity, the larger the internal resistance is, the higher the heat is. Further, in the energized state, the switch will bear certain impact and vibration inevitably, and the single connection contact point will cause loose contact of the contact part easily so that the working performance of the switch will be affected because of the severe heat. 
     SUMMARY OF THE INVENTION  
     The purpose of the present disclosure is to provide a reversing switch to solve the technical problem that a reversing loop of a side contact reversing switch in the art has larger internal resistance and is easy to produce heat while the performance of shock resistance and vibration resistance is poor. 
     To realize the purpose above, the present disclosure provides a reversing switch, comprising a switch body, and input terminals and output terminals independent from each other and provided in pairs on the switch body; each pair comprising one input terminal and one output terminal; wherein one of the input terminals is connected or disconnected with one of the output terminals via a plurality of independent reversing connectors, and the plurality of independent reversing connectors are configured to be movable synchronously. 
     Further, the input terminals comprise a first input terminal and a second input terminal; the output terminals comprise a first output terminal and a second output terminal; the first input terminal, the first output terminal, the second input terminal and the second output terminal are provided along the circumferential direction of the switch body in turn; the reversing connectors comprise a first group of reversing connectors and a second group of reversing connectors; the first input terminal is selectively connected to the first output terminal through the first group of reversing connectors or to the second output terminal through the second group of reversing connectors; the second input terminal is selectively connected to the first output terminal through the first group of reversing connectors or to the second output terminal through the second group of reversing connectors. 
     Further, the first group of reversing connectors comprises a first reversing connector and a second reversing connector provided along the thickness direction of the switch body and in parallel; the second group of reversing connectors comprises a third reversing connector and a fourth reversing connector provided along the thickness direction of the switch body and in parallel. 
     Further, a rotor installation groove is provided in the switch body; a reversing rotor is provided in the rotor installation groove, and the reversing connectors are provided on a side wall of the reversing rotor. 
     Further, the side wall of the reversing rotor is provided with connector installation slots which are independent from each other and of which the number and location are correspond to that of the reversing connectors, and each of the reversing connectors is provided in one of the connector installation slots correspondingly. 
     Further, a first side of the reversing rotor is provided with a first connector installation slot and a second connector installation slot independently provided along the axial direction of the reversing rotor and in parallel; the first reversing connector and the second reversing connector are provided in the first connector installation slot and the second connector installation slot, respectively; a second side of the reversing rotor is provided with a third connector installation slot and a fourth connector installation slot independently provided along the axial direction of the reversing rotor and in parallel; the third reversing connector and the fourth reversing connector are provided in the third connector installation slot and the fourth connector installation slot, respectively. 
     Further, the input terminals and the output terminals are located outside the switch body, and the input terminals and the output terminals are connected to the reversing connectors through input terminal connectors and output terminal connectors inside the switch body respectively; the input terminal connectors and the output terminal connectors are located between an outer surface of the reversing rotor and an inner side wall of the rotor installation groove. 
     Further, the reversing connectors are U-shaped reversing connectors; the connector installation slots are U-shaped grooves, and an arc bottom of the U-shaped reversing connector is connected to the input terminal connector and/or the output terminal connector. 
     Further, a top of the reversing rotor is provided with a reversing handle for controlling the rotation of the reversing rotor. 
     The present disclosure has the following beneficial effect: 
     The reversing switch provided by the present disclosure includes a switch body, and input terminals and output terminals independent from each other and provided in pairs on the switch body. Each pair includes one input terminal and one output terminal, wherein one of the input terminals is connected or disconnected to one of the output terminals via a plurality of independent reversing connectors, which are configured to be movable synchronously. The plurality of independent reversing connectors are adopted between the input terminals and the output terminals of the reversing switch provided by the present disclosure to realize the connection and the disconnection between the input terminal and the output terminal, thus increasing the contact area between the reversing connectors and the input terminals or the output terminals, reducing the contact resistance, and improving the current loading capability of the reversing switch. In the meanwhile, the contact reliability could be ensured when the reversing switch is powered on because the number of contacts is increased, thereby effectively resisting the affection on the switch performance by shock and vibration. 
     Besides the purpose, characteristics and advantages described above, the present disclosure further has other purposes, characteristics and advantages. The present disclosure will be further explained below in details with reference to the drawings. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS  
       The accompanying drawings which constitute a part of the present application are used for providing further understanding to the present disclosure. The exemplary embodiments of the present disclosure and the illustrations thereof are used for explaining the present disclosure, instead of constituting an improper limitation to the present disclosure. In the accompanying drawings: 
         FIG. 1  is a schematic view illustrating an internal structure of a reversing switch in a disconnected state in a preferred embodiment of the present disclosure; 
         FIG. 2  is a schematic view illustrating an internal structure of a reversing switch connected in a first direction in a preferred embodiment of the present disclosure; 
         FIG. 3  is a schematic view illustrating an integral structure of a reversing switch in a preferred embodiment of the present disclosure; 
         FIG. 4  is a schematic view illustrating an assembly structure of a reversing rotor and a reversing connector in a preferred embodiment of the present disclosure; and 
         FIG. 5  is a structural view illustrating two groups of reversing connectors in a preferred embodiment of the present disclosure. 
     
    
    
     DETAILED DESCRIPTION OF THE EMBODIMENTS  
     The embodiments of the present disclosure will be described in details below in combination with the accompanying drawings, but the present disclosure may be implemented by various different methods limited and covered by the claims. 
     As shown in  FIG. 1 ,  FIG. 2  and  FIG. 3 , the present disclosure provides a reversing switch, which includes a switch body  60 , and input terminals and output terminals independent from each other and provided in pairs on the switch body  60 . Each pair includes one input terminal and one output terminal. One of the input terminals is connected or disconnected to one of the output terminals via a plurality of independent reversing connectors, and the plurality of independent reversing connectors are configured to be movable synchronously. The plurality of independent reversing connectors are adopted between the input terminals and the output terminals of the reversing switch provided by the present disclosure to realize the connection and the disconnection between the input terminal and the output terminal, thus increasing the contact area between the reversing connectors and the input terminals or the output terminals, reducing the contact resistance, and improving the current loading capability of the reversing switch. In the meanwhile, the contact reliability could be ensured when the reversing switch is powered on because the number of contacts is increased, thereby effectively resisting the affection on the switch performance by shock and vibration. 
     The input terminals include a first input terminal  11  and a second input terminal  31 ; the output terminals include a first output terminal  21  and a second output terminal  41 . The first input terminal  11 , the first output terminal  21 , the second input terminal  31  and the second output terminal  41  are provided along the circumferential direction of the switch body  60  in turn. The reversing connectors include a first group of reversing connectors and a second group of reversing connectors. The first input terminal  11  is selectively connected to the first output terminal  21  through the first group of reversing connectors or to the second output terminal  41  through the second group of reversing connectors. The second input terminal  31  is selectively connected to the first output terminal  21  through the first group of reversing connectors or to the second output terminal  41  through the second group of reversing connectors. 
     As a specific embodiment, the first group of reversing connectors may include a first reversing connector  51  and a second reversing connector  53  provided along the thickness direction of the switch body  60  and in parallel; the second group of reversing connectors may include a third reversing connector  52  and a fourth reversing connector  54  provided along the thickness direction of the switch body  60  and in parallel. The reversing connectors are not connected to one another. Actually, the number of the reversing connectors in each group of reversing connectors is not limited to 2, and the number of the reversing connectors may be increased according to actual conditions. However, limited by the volume of the switch body  60 , the width, extending along the direction of the thickness of the switch body  60 , of each reversing connector will be reduced correspondingly with the increase of the number of the reversing connectors in each group. Although the width of each reversing connector is reduced, the contact area and the number of contact points between two ends of each group of reversing connectors and the input terminal connectors or the output terminal connectors are increased, so the stability of the reversing switch on the whole could still be increased. Of course, the width of each reversing connector does not have to be reduced if the volume of the switch body  60  allows, which depends on the limitation of the specific size. 
     Specifically, the input terminals and the output terminals are located outside the switch body  60 , and the input terminals and the output terminals are connected to the reversing connectors through input terminal connectors and output terminal connectors inside the switch body  60  respectively. 
     As shown in  FIG. 4  and  FIG. 5 , in order to realize the reversing function, a rotor installation groove is provided in the switch body  60 ; a reversing rotor  70  is provided inside the rotor installation groove, and the reversing connectors are provided on a side wall of the reversing rotor  70 ; the input terminal connectors and the output terminal connectors are located between an outer surface of the reversing rotor  70  and an inner side wall of the rotor installation groove. The side wall of the reversing rotor  70  is provided with connector installation slots which are independent with one another and of which the number and location are correspond to that of the reversing connectors, and each of the reversing connectors is provided in one of the connector installation slots correspondingly. 
     Correspondingly, a first side of the reversing rotor  70  is provided with a first connector installation slot and a second connector installation slot independently arranged along the axial direction of the reversing rotor  70  and in parallel; the first reversing connector  51  and the second reversing connector  53  are provided in the first connector installation slot and the second connector installation slot, respectively; a second side of the reversing rotor  70  is provided with a third connector installation slot and a fourth connector installation slot independently arranged along the axial direction of the reversing rotor  70  and in parallel; the third reversing connector  52  and the fourth reversing connector  54  are provided in the third connector installation slot and the fourth connector installation slot, respectively. 
     The reversing connectors are U-shaped reversing connectors; the connector installation slots are U-shaped grooves, and a bottom of the U-shaped reversing connector is connected to the input terminal connector and/or the output terminal connector. 
     A top of the reversing rotor  70  is provided with a reversing handle  71  for controlling the rotation of the reversing rotor  70 . 
     When the reversing switch of the disclosure is in a disconnected state, each group of reversing connectors cannot be connected to any one of the input terminals and any one of the output terminals at the same time, which means that a connected loop cannot be formed. For example, as shown in  FIG. 1 , the first group of reversing connectors is only connected to the first output terminal connector  20  and the second group of reversing connectors is only connected to the second output terminal connector  40 . When the reversing switch needs to be in a working state, as shown in  FIG. 2 , the reversing switch may be connected in a first direction through rotating the reversing rotor  70 : the first input terminal  11  and the first output terminal  21  are connected through the first reversing connector  51  and the second reversing connector  53 ; the second input terminal  31  and the second output terminal  41  are connected through the third reversing connector  52  and the fourth reversing connector  54 . When it needs to implement the reversing connection, the reversing rotor  70  may be further rotated so that the reversing switch is connected in a second direction: the first input terminal  11  and the second output terminal  41  are connected through the third reversing connector  52  and the fourth reversing connector  54 , and the second input terminal  31  and the first output terminal  21  are connected through the first reversing connector  51  and the second reversing connector  53 . 
     Actually, the reversing switch provided by the present disclosure can solve the technical problems of small contact area, large internal resistance, poor shock resistance, and poor vibration resistance between the reversing connectors and the input terminals or the output terminals. It is not only applicable to the case that the reversing connectors are provided at the side of the switch body  60 , but also applicable to the case that the reversing connectors are provided at one end of the switch body  60 . 
     The above are only preferred embodiments of the present disclosure and should not be used to limit the present disclosure. For those skilled in the art, the present disclosure may have various modifications and changes. Any modifications, equivalent replacements, improvements and the like within the spirit and principle of the present disclosure shall fall within the scope of protection of the present disclosure.