Driving system of moving contact and switch unit

Abstract

The invention discloses a driving system of a moving contact, the driving system is used for driving the moving contact to slide, the driving system comprises a transmission shaft which is rotatably arranged and a connecting rod mechanism which is connected with the transmission shaft, and the output end of the connecting rod mechanism is provided with a driving connecting part which is used for being connected with the moving contact. The transmission mechanism of the driving system of the moving contact adopts the connecting rod mechanism, the structure of the connecting rod mechanism is relatively simple, the space occupied by movement of the connecting rod mechanism is relatively small, arrangement of a larger arc extinguish chamber is facilitated, and the arc extinguish effect is improved.

Description

Technical Field

[0001] The invention relates to the field of low-voltage electrical appliances, and in particular to a driving system of a moving contact and a switch unit. Background Art

[0002] The rotary disconnector is usually composed of an operating mechanism unit and several stacked switch units. The switch unit includes a unit housing, each of which is equipped with a pair of stationary contact assemblies and a rotatable moving contact module. The moving contact module is fixed on the rotating shaft, and the operating mechanism unit can operate the rotating shaft to rotate, thereby closing or opening the moving and stationary contacts.

[0003] The existing rotary isolating switch has a bridge contact and a stationary contact that are rotatably connected. The rotatable connection requires the entire circular space to be occupied, resulting in reduced space utilization. With the design optimization of other supporting products, product miniaturization is also an inevitable trend. Therefore, the rotary isolating switch under the existing solution needs to be improved urgently. Summary of the invention

[0004] The purpose of the present invention is to overcome the defects of the prior art and provide a driving system for a moving contact and a switch unit.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A driving system for a moving contact is used to drive the moving contact to slide. The driving system comprises: a rotatably arranged transmission shaft and a connecting rod mechanism connected to the transmission shaft. The output end of the connecting rod mechanism is provided with a driving connection part for connecting the moving contact.

[0007] Preferably, the connecting rod mechanism includes: a rotating frame fixed on the transmission shaft and a first connecting rod, the first end of the first connecting rod is hingedly connected to the first end of the rotating frame, the hinge point between the first connecting rod and the rotating frame is eccentrically arranged with the rotation axis of the transmission shaft, and the second end of the first connecting rod is provided with a driving connection part hinged to the moving contact.

[0008] Preferably, the connecting rod mechanism also includes: a second connecting rod, the first end of the second connecting rod is hingedly connected to the second end of the rotating frame, the hinge point between the second connecting rod and the rotating frame is eccentrically arranged with the rotation axis of the transmission shaft, and the second end of the second connecting rod is provided with a driving connection part hinged to the moving contact.

[0009] Preferably, the transmission shaft is provided with at least one first limiting surface for circumferential limiting, and a transmission hole is provided in the middle of the rotating frame, the transmission hole corresponds to the cross-sectional shape of the transmission shaft, and is provided with a corresponding second limiting surface for circumferential limiting.

[0010] Preferably, both ends of the rotating frame protrude radially of the transmission shaft, and a first driving shaft and a second driving shaft are respectively provided at both ends of the rotating frame. A first driving hole is provided at the first end of the first connecting rod, and a second driving hole is provided at the first end of the second connecting rod. The rotating frame is hinged to the first driving hole of the first connecting rod and the second driving hole of the second connecting rod through the first driving shaft and the second driving shaft, respectively.

[0011] Preferably, the driving connection parts of the second ends of the first connecting rod and the second connecting rod are respectively the first connecting hole and the second connecting hole, and the first connecting rod and the second connecting rod are hinged to the moving contact through the first connecting hole and the second connecting hole, respectively.

[0012] Preferably, the connecting rod mechanism includes: a rotating frame, a first connecting rod and a plurality of third connecting rods, the first end of the first connecting rod is hingedly connected to the first end of the rotating frame, the second end of the first connecting rod is hingedly or fixedly connected to one of the third connecting rods, the remaining third connecting rods are hingedly or fixedly connected to each other in sequence, and the last third connecting rod is provided with a driving connection portion connected to the moving contact.

[0013] Preferably, the connecting rod mechanism also includes: a second connecting rod and a plurality of fourth connecting rods, the first end of the second connecting rod is hingedly connected to the second end of the rotating frame, the second end of the second connecting rod is hingedly or fixedly connected to one of the fourth connecting rods, the remaining fourth connecting rods are hingedly or fixedly connected to each other in sequence, and the last fourth connecting rod is provided with a driving connection portion connected to the moving contact.

[0014] Preferably, it also includes a slide rail and a slider, and the moving contact is installed on the slider; one end of the slider is slidably matched with the slide rail, and the other end is connected to the connecting rod mechanism; the transmission shaft rotates to drive the connecting rod mechanism to drive the slider to slide in the slide rail, and the slider drives the moving contact to slide along the slide rail.

[0015] The present invention also provides a switch unit, comprising a moving contact and a driving system for the moving contact as described above.

[0016] The transmission mechanism of the driving system of the moving contact of the present invention adopts a connecting rod mechanism. The structure of the connecting rod mechanism is relatively simple, but the space occupied by its movement is relatively small. Compared with the moving contact driving mechanism of the traditional switch unit, the connecting rod mechanism can drive the moving contact to achieve linear motion, that is, the space it occupies is only a linear area, while the traditional method is to drive the moving contact to move in a circular motion. Therefore, the traditional method occupies a whole circular area, which results in a large amount of space being wasted, which has a great impact on the size of the arc extinguishing chamber and is not conducive to the layout and setting of the arc extinguishing chamber. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a structural schematic diagram of a switch unit of the present invention;

[0018] Figure 2 is a schematic diagram of the internal component structure of the switch unit of the present invention;

[0019] Figure 3 It is a structural schematic diagram of the transmission shaft of the present invention;

[0020] Figure 4 1 is a schematic diagram of the structure of the rotating frame of the invention;

[0021] Figure 5 is a top view of the rotating frame of the present invention;

[0022] Figure 6 is a schematic structural diagram of the first connecting rod of the present invention;

[0023] Figure 7 is a schematic structural diagram of the second connecting rod of the present invention;

[0024] Figure 8 It is a structural schematic diagram of another connecting rod mechanism of the present invention;

[0025] Fig. 9 It is a structural schematic diagram of another connecting rod mechanism of the present invention.

[0026] 6 Rotating frame 7 transmission shaft 10 case 20 Interrupter 30 Stationary contact 31 First stationary contact 32 Second static contact 33 The third static contact 34 Fourth static contact 40 Moving contact 41 First moving contact 42 Second moving contact 5a First connecting rod 5b Second connecting rod 5c Third Link 5d Fourth connecting rod 501a First drive hole 502a First connecting hole 501b Second drive hole 502b Second connection hole 602 Transmission hole 603 First drive shaft 604 Second drive shaft 607 The second limiting surface 701 Drive unit 702 Transmission 707 The first limit surface 57 Limit retaining wall 103 Slide rails DETAILED DESCRIPTION

[0027] The specific implementation of the driving system of the movable contact of the present invention is further described below in conjunction with the embodiments given in the accompanying drawings. The driving system of the movable contact of the present invention is not limited to the description of the following embodiments.

[0028] The rotary isolating switch usually includes an operating unit and at least one switch unit, which are stacked together. The switch unit includes a moving contact and a stationary contact. The operating unit is provided with an output shaft, which is connected to a transmission shaft 7 of the switch unit. The transmission shafts 7 of adjacent switch units are connected. The output shaft of the operating unit drives the transmission shaft 7 to rotate, thereby driving the switch unit to close and open.

[0029] like Figure 1 and Figure 2 The figure shows a specific embodiment of a driving system for a moving contact, which is arranged in a switch unit for driving the moving contact. The driving system includes: a transmission shaft 7, and a connecting rod mechanism connected to the transmission shaft 7, the transmission shaft 7 is passed through the housing 10 of the switch unit, and the output end of the connecting rod mechanism is provided with a driving connection part for connecting the moving contact.

[0030] In this embodiment, the connecting rod mechanism includes: a rotating frame 6 fixed on the transmission shaft 7 and a first connecting rod 5a, the first end of the first connecting rod 5a is hingedly connected to the first end of the rotating frame 6, the hinge point of the first connecting rod 5a and the rotating frame 6 is eccentrically arranged with the rotation axis of the transmission shaft 7, and the second end of the first connecting rod 5a is provided with the driving connection part, which is connected to the moving contact and is used to drive the moving contact to slide. In this embodiment, the rotating frame 6 and the first connecting rod 5a constitute a simple two-link mechanism, the structure of the two-link mechanism is relatively simple, but the space occupied by its movement is relatively small. Compared with the moving contact driving mechanism of the traditional switch unit, the two-link mechanism can drive the moving contact to achieve linear motion, that is, the space occupied by it is only a linear area, while the traditional one is achieved by driving the moving contact to move in a circular motion, so the space occupied by the traditional one is a whole circular area, which results in a large amount of space being wasted, which has a great impact on the size of the arc extinguishing chamber and is not conducive to the overall miniaturization of the product. In this way, the driving system of the moving contact can be used to drive a moving contact to move in a linear motion.

[0031] In this embodiment, the connecting rod mechanism further includes: a second connecting rod 5b, the first end of the second connecting rod 5b is hingedly connected to the second end of the rotating frame 6, the hinge point of the second connecting rod 5b and the rotating frame 6 is eccentrically arranged with the rotating axis of the transmission shaft 7, and the second end of the second connecting rod 5b is provided with the driving connection part. The two ends of the rotating frame 6 can realize the arrangement of two two-connecting rod mechanisms, thereby realizing the driving of two moving contacts.

[0032] In this embodiment, the driving system of the moving contact is provided with a limiting structure to limit the moving path of the moving contact so that the corresponding moving contact moves along a preset path under the drive of the first connecting rod 5a or the second connecting rod 5b. In one embodiment, the limiting structure is a slide rail 103 provided on the housing 10, the moving contact is mounted on the slider 80, the slider 80 and the slide rail 103 are slidably matched, and the slide rail 103 in this embodiment is a linear slide rail, and the transmission shaft 7 rotates through the connecting rod mechanism to drive the moving contact to move linearly along the slide rail.

[0033] In this embodiment, if Figure 3 As shown, one end of the transmission shaft 7 is a driving part 701, which is used to connect to an external driving mechanism or to connect to the transmission shaft of another layer of switch units, and the shaft body is a transmission part 702, and the shaft body of the transmission shaft 7 is provided with at least one circumferential limiting first limiting surface 707. Figure 4 and Figure 5As shown, a transmission hole 602 is provided in the middle of the rotating frame 6, and the transmission hole 602 corresponds to the cross-sectional shape of the transmission shaft 7, and is provided with a corresponding second limiting surface 607 for circumferential limiting. The transmission shaft 7 is inserted into the transmission hole 602 of the rotating frame 6 to connect the two. Of course, as other embodiments, the transmission shaft 7 can be an integrated structure with the rotating frame 6.

[0034] In this embodiment, the transmission shaft 7 has a plurality of first limiting surfaces 7 and the cross-section thereof is a "cross"-shaped structure or a polygonal structure, and the transmission hole 602 is also a "cross"-shaped hole or a polygonal hole correspondingly.

[0035] In this embodiment, the two ends of the rotating frame 6 protrude radially from the transmission shaft 7, and the first driving shaft 603 and the second driving shaft 604 are respectively provided at the two ends of the rotating frame 6. The first driving shaft 603 and the second driving shaft 604 are symmetrically arranged on both sides of the rotation axis of the transmission shaft 7. The first end of the first connecting rod 5a is provided with a first driving hole 501a, and the first end of the second connecting rod 5b is provided with a second driving hole 501b. The rotating frame 6 is hinged with the first driving hole 501a of the first connecting rod 5a and the second driving hole 501b of the second connecting rod 5b through the first driving shaft 603 and the second driving shaft 604.

[0036] In this embodiment, the driving connection parts of the second ends of the first connecting rod 5a and the second connecting rod 5b are the first connecting hole 502a and the second connecting hole 502b, and the first connecting rod 5a and the second connecting rod 5b are hinged to the moving contact through a connecting shaft.

[0037] As another alternative implementation, Figure 8 As shown, the connecting rod mechanism includes: a rotating frame 6, a first connecting rod 5a and a plurality of third connecting rods 5c, wherein the first end of the first connecting rod 5a is hingedly connected to the first end of the rotating frame 6, the second end of the first connecting rod 5a is hingedly connected or fixedly connected to one of the third connecting rods 5c, and the remaining third connecting rods 5c are hingedly connected or fixedly connected to each other in sequence, and the last third connecting rod 5c is provided with the driving connection part, connected to the moving contact 41, and the operating range of the third connecting rod 5c is limited by the limiting retaining wall 57 to ensure that the operating direction of the moving contact 41 is toward the static contact. Among them, the movement of the third connecting rod 5c is limited by the sliding groove to maintain its movement posture. Through the setting of multiple third connecting rods 5c, in some cases, it can make up for the situation that the movement distance of the second connecting rod 5a cannot make the moving contact reach the preset distance. At the same time, it can also reduce the length of the rotating frame and further reduce the occupied space.

[0038] Similarly, if Fig. 9As shown, the connecting rod mechanism also includes: a second connecting rod 5b and multiple fourth connecting rods 5d, the first end of the second connecting rod 5b is hingedly connected to the second end of the rotating frame 6, the second end of the second connecting rod 5b is hingedly or fixedly connected to one of the fourth connecting rods 5d, and the remaining fourth connecting rods 5d are hingedly or fixedly connected to each other in sequence, and the last fourth connecting rod 5d is provided with the driving connection part, which is connected to the moving contact 42, and the operating range of the third connecting rod 5c is limited by the limit retaining wall 57 to ensure that the operating direction of the moving contact 42 is toward the static contact.

[0039] Based on the above embodiments, reference Figure 1 and Figure 2 As shown, the driving system of the movable contact of the present embodiment can be applied to the switch unit, and is used to drive the movable contact 40 (the first movable contact 41 and the second movable contact 42) to make contact or break contact with the stationary contact 30 (the first stationary contact 31, the second stationary contact 32, the third stationary contact 33 and the fourth stationary contact 34). In the present embodiment, the switch unit includes two movable contacts 40, namely the first movable contact 41 and the second movable contact 42, and four stationary contacts 30, namely the first stationary contact 31, the second stationary contact 32, the third stationary contact 33 and the fourth stationary contact 34. The driving system of the moving contact includes a transmission shaft 7, a rotating frame 6 fixed on the transmission shaft 7, a first connecting rod 5a and a second connecting rod 5b hinged to both ends of the rotating frame 6, respectively, and the driving connection parts of the first connecting rod 5a and the second connecting rod 5b are hinged to the first moving contact 41 and the second moving contact 42 respectively. The transmission shaft 7 rotates through the first connecting rod 5a to drive the first moving contact 41 to move linearly along the left slide rail, and the two ends of the first moving contact 41 contact with the first static contact 31 and the second static contact 32 to conduct a circuit. At the same time, the transmission shaft 7 rotates through the second connecting rod 5b to drive the second moving contact 42 to move linearly along the right slide rail, and the two ends of the second moving contact 42 contact with the third static contact 33 and the fourth static contact 34 to conduct another circuit. That is to say, based on the driving system of the moving contact of this embodiment, in one switch unit, two independent moving contacts can be driven simultaneously to slide linearly along the slide rail, and each independent moving contact can respectively contact with two static contacts to conduct a circuit. Therefore, in one switch unit of this embodiment, at least two circuits can be disconnected, that is, there are two circuit switches.

[0040] Of course, based on the drive system structure of this embodiment, it is also possible to realize the arrangement of four circuit switches under reasonable spatial arrangement. For example, this embodiment adopts the method of relatively arranging the first connecting rod and the second connecting rod. If a cross-shaped arrangement is adopted, four connecting rods can be arranged, thereby realizing the arrangement of four circuit switches. In particular, in some specific applications, when the current is small, the space of the arc extinguishing chamber can be compressed or the arc extinguishing chamber can be omitted, thereby realizing the reasonable arrangement of the four circuit switches.

[0041] It should be noted that in the description of the present invention, the terms "upper", "lower", "left", "right", "inner", "outer", etc. indicate directions or positional relationships based on directions or positional relationships shown in the accompanying drawings, or directions or positional relationships that are usually placed when in use, and are only for the convenience of description, rather than indicating that the device or element referred to must have a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish descriptions, and cannot be understood as indicating relative importance.

[0042] The above contents are further detailed descriptions of the present invention in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. A driving system for a moving contact, used for driving the moving contact to slide, characterized in that: The driving system comprises: a rotatably arranged transmission shaft (7), and a connecting rod mechanism connected to the transmission shaft (7), wherein the output end of the connecting rod mechanism is provided with a driving connection part for connecting to the moving contact.

2. The driving system of the moving contact according to claim 1, characterized in that: The connecting rod mechanism comprises: a rotating frame (6) fixed on the transmission shaft (7) and a first connecting rod (5a), the first end of the first connecting rod (5a) being hingedly connected to the first end of the rotating frame (6), the hinge point between the first connecting rod (5a) and the rotating frame (6) being eccentrically arranged with respect to the rotation axis of the transmission shaft (7), and the second end of the first connecting rod (5a) being provided with a driving connection portion hingedly connected to a moving contact.

3. The driving system of the moving contact according to claim 2, characterized in that: The connecting rod mechanism also includes: a second connecting rod (5b), the first end of the second connecting rod (5b) is hingedly connected to the second end of the rotating frame (6), the hinge point between the second connecting rod (5b) and the rotating frame (6) is eccentrically arranged with respect to the rotating axis of the transmission shaft (7), and the second end of the second connecting rod (5b) is provided with a driving connection portion hingedly connected to the moving contact.

4. The driving system of the moving contact according to claim 2 or 3, characterized in that: The transmission shaft (7) is provided with at least one first limiting surface (707) for circumferential limiting, and a transmission hole (602) is provided in the middle of the rotating frame (6), the transmission hole (602) corresponds to the cross-sectional shape of the transmission shaft (7), and is provided with a corresponding second limiting surface (607) for circumferential limiting.

5. The driving system of the moving contact according to claim 3, characterized in that: The two ends of the rotating frame (6) protrude radially from the transmission shaft (7); the two ends of the rotating frame (6) are respectively provided with a first driving shaft (603) and a second driving shaft (604); the first end of the first connecting rod (5a) is provided with a first driving hole (501a); the first end of the second connecting rod (5b) is provided with a second driving hole (501b); the rotating frame (6) is hinged to the first driving hole (501a) of the first connecting rod (5a) and the second driving hole (501b) of the second connecting rod (5b) through the first driving shaft (603) and the second driving shaft (604), respectively.

6. The driving system of the moving contact according to claim 3, characterized in that: The driving connection parts of the second ends of the first connecting rod (5a) and the second connecting rod (5b) are respectively the first connecting hole (502a) and the second connecting hole (502b); the first connecting rod (5a) and the second connecting rod (5b) are respectively hinged to the moving contact through the first connecting hole (502a) and the second connecting hole (502b).

7. The driving system of the moving contact according to claim 1, characterized in that: The connecting rod mechanism comprises: a rotating frame (6), a first connecting rod (5a) and a plurality of third connecting rods (5c), wherein the first end of the first connecting rod (5a) is hingedly connected to the first end of the rotating frame (6), the second end of the first connecting rod (5a) is hingedly connected or fixedly connected to one of the third connecting rods (5c), and the remaining third connecting rods (5c) are hingedly connected or fixedly connected to each other in sequence, and the last third connecting rod (5c) is provided with a driving connection portion connected to a moving contact.

8. The driving system of the moving contact according to claim 7, characterized in that: The connecting rod mechanism also includes: a second connecting rod (5b) and a plurality of fourth connecting rods (5d), wherein the first end of the second connecting rod (5b) is hingedly connected to the second end of the rotating frame (6), the second end of the second connecting rod (5b) is hingedly connected or fixedly connected to one of the fourth connecting rods (5d), and the remaining fourth connecting rods (5d) are hingedly connected or fixedly connected to each other in sequence, and the last fourth connecting rod (5d) is provided with a driving connection portion connected to the moving contact.

9. The driving system of the moving contact according to claim 1, characterized in that: It also includes a slide rail (103) and a slider (80), and the moving contact is installed on the slider (80); one end of the slider (80) is slidably matched with the slide rail (103), and the other end is connected to the connecting rod mechanism; the transmission shaft (7) rotates to drive the connecting rod mechanism to drive the slider (80) to slide in the slide rail (103), and the slider (80) drives the moving contact to slide along the slide rail (103).

10. A switch unit, characterized in that: The invention comprises a moving contact and a driving system of the moving contact as claimed in any one of claims 1 to 9.

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