Isolating switch contact structure and isolating switch thereof

Abstract

The utility model discloses an isolation switch contact structure and an isolation switch thereof, the isolation switch contact structure comprises a moving contact assembly hinged on a lower connecting copper bar and a static contact fixedly arranged on an upper connecting copper bar, the moving contact assembly is composed of two moving contact knives, two opposite sides of the two moving contact knives are respectively provided with two groups of double-fastening sheets, and the two groups of double-fastening sheets are fixed on the static contact. The two sets of double-fastening sheets are of an arch structure and extend for a set distance in the length direction of the moving contact knives, the two sets of double-fastening sheets are pre-tightened and abut against the two moving contact knives through locking structures, and locking pressure for oppositely pressing the static contact is applied to the two moving contact knives. According to the isolating switch adopting the technical scheme, multipoint fastening and positioning of the two moving contact knives are realized through two groups of double-tightening, stress points are increased and are more balanced, and more locking pressure can be provided when the moving contact knives are switched on, so that stable and reliable contact pressure and good electrical performance of the moving contact and the static contact are ensured, and the use performance of the isolating switch is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of isolating switches, in particular to an isolating switch contact structure and an isolating switch thereof. Background Art

[0002] Isolating switches are mainly used for the no-load link of the line, as well as for the electrical isolation of the high-voltage busbar, circuit breaker and other electrical equipment under maintenance from the energized high-voltage line. They are the most widely used high-voltage switchgear in the high-voltage power system, ensuring the safety of maintenance personnel when repairing high-voltage switchgear. Figure 6 The isolating switch shown in the figure comprises a plurality of contact structures arranged on a base frame, each contact structure comprises a static contact 01 and a moving contact blade 02 arranged on the base frame, and an operating mechanism for controlling the closing or opening of the moving contact blade and the static contact. The rotation of the moving contact blade is realized by the action of the operating mechanism, and the static contact seat is located on the rotation track of the moving contact blade. In order to ensure the tightness of the closing contact between the moving contact blade and the static contact, the moving contact blade is generally composed of two pieces. A bolt 03 is inserted between the two moving contact blades, and then a cylindrical spring 04 is sleeved on the bolt and locked with a nut. The spring 04 applies a contact pressure to the two moving contact blades to press the static contact. However, it can be seen from the above structure that the existing moving contact blade structure still has the following problems in actual use: the cylindrical spring acts on one moving contact blade on one side, and the force points are concentrated in one place. The locking pressure provided for closing the moving contact blade is also relatively small, which easily causes the moving and static contacts to be not in close contact and increase the contact resistance, affecting the electrical performance of the isolating switch, and the spring is not easy to observe when stress fatigue occurs. Utility Model Content

[0003] Therefore, the technical problem to be solved by the utility model is to overcome the problem that the locking pressure provided by the spring for closing the moving contact blade in the isolating switch in the prior art is relatively small, which easily causes the moving and static contacts to be not in close contact and increases the contact resistance, thus affecting the electrical performance of the isolating switch.

[0004] In order to solve the above technical problems, the utility model provides a contact structure of an isolating switch, including a moving contact assembly hingedly arranged on a lower connecting copper bar, and a stationary contact fixedly arranged on an upper connecting copper bar, the moving contact assembly is composed of two opposite moving contact blades, a clamping opening suitable for clamping the stationary contact is formed between the two moving contact blades, two groups of double fastening plates are respectively arranged on the opposite sides of the two moving contact blades, the two groups of double fastening plates are arched structures and extend a set distance along the length direction of the moving contact blades, the two groups of double fastening plates are pre-tightened and pressed against the two moving contact blades by a locking structure, and a locking pressure is applied to the two moving contact blades to press the stationary contacts toward each other, and a positioning structure for maintaining the relative position of the two moving contact blades and the two groups of double fastening plates is provided between the two moving contact blades.

[0005] In the above-mentioned isolating switch contact structure, the locking structure includes a fixing bolt passed through two groups of double fastening plates and two moving contact blades, and a locking nut threadedly connected to the fastening bolt. By tightening the locking nut, the two groups of double fastening plates are locked relative to each other and pressed against the two moving contact blades.

[0006] In the above-mentioned isolating switch contact structure, each set of double fastening plates includes an arched bottom plate pressed against the side of the moving contact blade, and an arched top plate pressed against the outer surface of the arched bottom plate, and the length of the arched bottom plate is greater than the length of the arched top plate.

[0007] In the above-mentioned isolating switch contact structure, the arched bottom plate and the arched top plate are respectively spring structures made of metal materials.

[0008] In the above-mentioned isolating switch contact structure, the middle positions of the arched bottom plate and the arched top plate are respectively provided with connecting holes for the fixing bolts to pass through, and a gap limit block is provided between the two movable contact blades, and the fixing bolts pass through the gap limit block.

[0009] In the above-mentioned isolating switch contact structure, one end of the two moving contact knives is rotatably set on the conductor of the lower connected copper busbar through a bolt pair, and two contact protrusions protruding toward each other are stamped on the other end of the two moving contact knives, and the contact protrusions are in an arc shape, and the clamping opening is formed between the two contact protrusions; the double fastening plate is connected between the two ends of the moving contact knives.

[0010] In the above-mentioned isolating switch contact structure, the positioning structure includes first positioning holes respectively arranged on the arched bottom plate and the arched top plate, second positioning holes respectively arranged on the two movable contact blades and opposite to the first positioning holes, and positioning pins passing through the first positioning holes and the second positioning holes.

[0011] The utility model also provides an isolating switch, comprising a base frame and the isolating switch contact structure described in any one of the above items, wherein three upper connecting copper bars and three lower connecting copper bars are relatively arranged on the base frame, and the isolating switch contact structure comprises three groups of moving contact knives respectively connected to the three lower connecting copper bars, and three static contacts connected to the three upper connecting copper bars, and the static contacts and the upper connecting copper bars are formed as an integral structure.

[0012] The above-mentioned isolating switch also includes an operating mechanism for driving the three groups of moving contact knives to contact or separate with the three static contacts. The operating mechanism includes a driving shaft linked to the three groups of moving contact knives, a push rod assembly connected to the driving shaft, and a driving structure that drives the push rod assembly to reciprocate along its axial direction.

[0013] In the above-mentioned isolating switch, the push rod assembly includes a push rod member connected to the driving shaft, and an adjusting rod movably connected to one end of the push rod member through a threaded structure, and the adjusting rod is connected to the driving structure through a transmission crank arm.

[0014] Compared with the prior art, the utility model has the following advantages:

[0015] 1. In the contact structure of the isolating switch provided by the utility model, two groups of double fastening plates with an arched structure design are arranged on the two opposite sides of the two moving contact blades. The two groups of double fastening plates are pre-tightened and pressed against the two moving contact blades through the locking structure, so that the two moving contact blades can firmly press the static contacts with the help of the locking pressure applied by the two groups of double fastening plates when closing the switch, thereby ensuring the close contact between the moving and static contacts. The isolating switch of the technical solution adopts two groups of double fastening plates to replace the traditional old spring structure, realizes multi-point fastening and positioning of the two moving contact blades, increases the force points and is more balanced, and can provide more locking pressure when the moving contact blade is closed, thereby increasing the contact pressure between the moving and static contacts, ensuring the stability of the contact resistance, so as to improve the current carrying capacity of the moving contact blade, and it is easier to observe the stress of the double fastening plates, so as to facilitate the replacement operation. Such a design ensures that the contact pressure of the moving and static contacts is stable and reliable, and the electrical performance is good, thereby improving the electrical reliability of the isolating switch as a whole.

[0016] 2. In the contact structure of the isolating switch provided by the utility model, each group of double fastening plates is composed of an arched bottom plate and an arched top plate, which are metal spring plates with high strength, elasticity and fatigue resistance. When the two groups of double fastening plates are fastened by fixing bolts and locking nuts, the arched bottom plate and the arched top plate will be elastically deformed under pressure and squeeze the two moving contact blades toward each other, so that the pressure of the arched bottom plate and the arched top plate is jointly applied to the moving contact blade. Compared with the old spring structure, it can provide the two moving contact blades with a larger and more stable contact locking pressure, ensuring that the contact pressure between the moving contact blade and the static contact is stable and reliable, which is beneficial to improving the current carrying capacity and improving the power supply reliability.

[0017] 3. In the isolating switch contact structure provided by the utility model, by respectively providing relative first positioning holes and second hole holes on two groups of double fastening plates and two movable contact knives, and passing positioning pins through the first positioning holes and the second hole holes, the two groups of double fastening plates can be effectively prevented from positionally shifting, ensuring that the two groups of double fastening plates are stably and reliably pressed against the two sides of the two movable contact knives, and providing continuous and stable elastic pressure for the two movable contact knives.

[0018] 4. In the isolating switch provided by the utility model, the moving contact knife is driven by the operating mechanism to realize contact or separation with the static contact. The operating mechanism is mainly composed of a driving shaft, a push rod assembly and a driving structure. The push rod assembly includes a push rod member and an adjusting rod connected by a threaded structure. Such a design can realize the length adjustment of the push rod assembly, and the motion and force are transmitted between the driving structure and the driving shaft through the push rod assembly. This isolating switch adopts a double fastening plate on each group of moving contact knives to increase the contact locking pressure and ensure the stability of the contact resistance, thereby meeting the requirements of large current passing, which is beneficial to reduce energy loss and improve the performance of the isolating switch. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 A schematic diagram of the planar structure of the isolating switch provided by the utility model;

[0021] Figure 2 A schematic diagram of the structure of the isolating switch contact structure provided by the utility model;

[0022] Figure 3 It is a front view of the arched bottom film of the utility model;

[0023] Figure 4 It is a front view of the arched top sheet of the utility model;

[0024] Figure 5 It is a side view of the isolating switch of the utility model;

[0025] Figure 6 The present invention is a schematic structural diagram of a disconnect switch contact structure in the prior art.

[0026] Explanation of the reference numerals in the accompanying drawings: 1. static contact; 2. moving contact knife; 21. clamping mouth; 22. contact protrusion; 23. bolt pair; 3. double fastening plate; 31. arched bottom plate; 32. arched top plate; 33. connecting hole; 34. first positioning hole; 4. fixing bolt; 41. locking nut; 5. gap limit block; 6. locating pin; 7. base frame; 71. upper connecting copper bar; 72. lower connecting copper bar; 81. driving shaft; 82. push rod; 83. adjusting rod; 9. driving structure. DETAILED DESCRIPTION

[0027] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] In the description of the present invention, it should be noted that the terms "first", "second" and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0029] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0031] Example 1

[0032] The present embodiment is described in detail below with reference to the accompanying drawings:

[0033] This embodiment provides Figure 1-5 A contact structure of an isolating switch shown in the figure comprises a moving contact assembly hingedly arranged on a lower connecting copper bar, and a stationary contact 1 fixedly arranged on an upper connecting copper bar, wherein the moving contact assembly is composed of two opposite moving contact blades 2, and a clamping opening 21 suitable for clamping the stationary contact 1 is formed between the two moving contact blades 2, wherein two groups of double fastening plates 3 are respectively arranged on the opposite sides of the two moving contact blades 2, and the two groups of double fastening plates 3 are arched structures and extend a set distance along the length direction of the moving contact blades 2, the two groups of double fastening plates 3 are pre-tightened and pressed against the two moving contact blades 2 by a locking structure, and a locking pressure is applied to the two moving contact blades 2 to press the stationary contact 1 toward each other, and a positioning structure for maintaining the relative position of the two moving contact blades 2 and the two groups of double fastening plates 3 is provided between the two moving contact blades 2.

[0034] In the above-mentioned embodiment, two groups of double fastening plates 3 with an arched structure are provided on the two opposite sides of the two moving contact blades 2. The two groups of double fastening plates 3 are pre-tightened and pressed against the two moving contact blades 2 through the locking structure, so that the two moving contact blades 2 can firmly press the static contact 1 with the locking pressure applied by the two groups of double fastening plates 3 to ensure close contact between the moving and static contacts 1. The isolating switch of the present technical solution adopts two groups of double fastening plates 3 to replace the traditional old-style spring structure, and realizes multi-point fastening and positioning of the two moving contact blades 2, increases the force points and is more balanced, and can provide more locking pressure when the moving contact blade 2 is closed, thereby increasing the contact pressure between the moving and static contacts, ensuring the stability of the contact resistance, so as to improve the current carrying capacity of the moving contact blade, and it is easier to observe the stress of the double fastening plates to facilitate the replacement operation. Such a design ensures that the contact pressure of the moving and static contacts is stable and reliable, and the electrical performance is good, thereby improving the electrical reliability of the isolating switch as a whole.

[0035] As a preferred embodiment, the locking structure includes a fixing bolt 4 passed through the two groups of the double fastening plates 3 and the two moving contact blades 2, and a locking nut 41 threadedly connected to the fastening bolt. By tightening the locking nut 41, the two groups of double fastening plates 3 are relatively locked and pressed against the two moving contact blades 2. Since there are at least two contact force positions between each group of double fastening plates 3 and each moving contact blade 2, when the double fastening plates 3 are squeezed by the locking nut 41, elastic deformation will be generated, and the deformation pressure will be transferred to the two moving contact blades 2 for conversion into a locking pressure for pressing the static contact 1, thereby achieving close contact between the moving contact blade and the static contact.

[0036] Combine the following Figure 1-4 The specific arrangement of the double fastening plates is described in detail:

[0037] Each set of double fastening plates 3 includes an arched bottom plate 31 pressed against the side of the movable contact knife 2, and an arched top plate 32 pressed against the outer surface of the arched bottom plate 31. The length of the arched bottom plate 31 is greater than the length of the arched top plate 32. Therefore, only the two ends of the arched bottom plate 31 are pressed against the outer side of the movable contact knife 2, and the arched top plate 32 is pressed against the arched top plate 32 when under pressure, and the deformation pressure generated is applied to the arched bottom plate 31. The two sets of double fastening plates 3 cooperate with the two movable contact knives 2 to contact a total of four force points, and the installation force is more balanced. It is further preferred that the arched bottom plate 31 and the arched top plate 32 are respectively spring structures made of metal materials, so that they have high strength, elasticity and fatigue resistance. When the two sets of double fastening plates 3 are fastened by the fixing bolts and locking nuts, the arched bottom plate 31 and the arched top plate 32 will be elastically deformed under pressure and squeeze the two moving contact blades 2 towards each other, so that the pressure of the arched bottom plate 31 and the arched top plate 32 are jointly applied to the moving contact piece. Compared with the old spring structure, it can provide a larger and more stable contact locking pressure for the two moving contact blades, ensuring that the contact pressure between the moving contact blade and the static contact is stable and reliable, which is beneficial to improving the current carrying capacity and improving the power supply reliability.

[0038] It is further preferred that the middle positions of the arched bottom plate 31 and the arched top plate 32 are respectively provided with connection holes 33 for the fixing bolts 4 to pass through, and the connection holes 33 for the fixing bolts 4 to pass through are formed on the two movable contact knives 2, and a gap limit block 5 is provided between the two movable contact knives 2, and the fixing bolts 4 pass through the gap limit block 5. Figure 1 and 2 As shown, one end of the two movable contact blades 2 is rotatably set on the conductor of the lower connected copper busbar through a bolt pair 23, and two contact protrusions 22 protruding toward each other are stamped on the other end of the two movable contact blades 2, and the contact protrusions 22 are in an arc shape. The double fastening plates 3 are connected between the two ends of the movable contact blades 2, and the clamping opening 21 is formed between the two contact protrusions 22. The static contact 1 is pressed by the two contact protrusions 22 at the position of the clamping opening 21. The two contact protrusions 22 make the movable contact blade 2 and the static contact 1 more closely matched and contacted, avoiding the generation of a connection gap between the contact surfaces of the two, and the matched contact is stable and reliable, increasing the contact area and improving the current carrying capacity.

[0039] Combination Figure 2-4As shown, the positioning structure includes first positioning holes 34 respectively corresponding to the arched bottom plate 31 and the arched top plate 32, and second positioning holes respectively corresponding to the two movable contact knives 2 and opposite to the first positioning holes 34, and positioning pins 6 passing through the first positioning holes 34 and the second positioning holes. By setting the positioning pins 6, the position displacement of the two groups of double fastening plates 3 can be effectively prevented, ensuring that the two groups of double fastening plates 3 are stably and reliably pressed against the two sides of the two movable contact knives 2, and providing continuous and stable elastic pressure for the two movable contact knives 2.

[0040] Example 2

[0041] This embodiment provides Figure 1 and Figure 5 An isolating switch shown in the figure comprises a base frame 7 and the isolating switch contact structure described in Example 1. The isolating switch can meet the wiring requirements of the three-phase line. Three upper connecting copper bars 71 and three lower connecting copper bars 72 are relatively arranged on the base frame 7. The isolating switch contact structure comprises three groups of moving contact blades 2 respectively connected to the three lower connecting copper bars 72, and three static contacts 1 connected to the three upper connecting copper bars 71. The static contacts 1 and the upper connecting copper bars 71 are formed as an integral structure. Each group of moving contact blades consists of two pieces. The isolating switch of this embodiment is provided with the isolating switch contact structure as described above, and thus naturally has all the advantages brought by the provision of the above-mentioned contact structure. The isolating switch increases the contact locking pressure by adopting the arrangement of double fastening plates 3 on each group of moving contact blades 2, thereby ensuring the stability of the contact resistance, thereby meeting the requirements for large current passing, which is beneficial to reducing energy loss and improving the performance of the isolating switch.

[0042] This isolating switch also includes an operating mechanism for driving the three groups of moving contact blades 2 to contact or separate with the three static contacts 1, the operating mechanism includes a driving shaft 81 that is linked to the three groups of moving contact blades 2, and a push rod assembly connected to the driving shaft 81, and a driving structure 9 that drives the push rod assembly to reciprocate along its axial direction. Three gap limit blocks 5 are respectively provided on the three groups of moving contact blades 2, and the driving shaft 81 is penetrated through the three gap limit blocks 5. The driving shaft 81 is extended along the arrangement direction of the three groups of moving contact blades 2. Further, the push rod assembly includes a push rod member 82 connected to the driving shaft 81, and an adjusting rod 83 that is movably connected to one end of the push rod member 82 through a threaded structure. The adjusting rod 83 is connected to the driving structure 9 through a transmission crank arm. The driving structure can preferably be an operating handle assembly or a motor structure. The moving contact blade is driven by the operating mechanism to realize contact or separation with the static contact 1. Since the push rod member 82 and the adjusting rod 83 are connected by a threaded connection, the length of the push rod assembly can be adjusted to meet the requirements of different transmission distances. This design transmits motion and force between the driving structure and the driving shaft through the push rod assembly, and the transmission is reliable to realize the connection or disconnection operation of the isolating switch.

[0043] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention of the utility model.

Claims

1. A disconnector contact structure, comprising a movable contact assembly hingedly arranged on a lower connecting copper bar, and a stationary contact (1) fixedly arranged on an upper connecting copper bar, wherein the movable contact assembly is composed of two opposite movable contact blades (2), and a clamping opening (21) suitable for clamping the stationary contact (1) is formed between the two movable contact blades (2), characterized in that: Two groups of double fastening plates (3) are respectively arranged on opposite sides of the two movable contact knives (2); the two groups of double fastening plates (3) are in an arched structure and extend a set distance along the length direction of the movable contact knives (2); the two groups of double fastening plates (3) are pre-tightened and pressed against the two movable contact knives (2) through a locking structure, and a locking pressure is applied to the two movable contact knives (2) to press the static contacts (1) toward each other; and a positioning structure is provided between the two movable contact knives (2) and the two groups of double fastening plates (3) to maintain the relative positions of the two.

2. The isolating switch contact structure according to claim 1, characterized in that: The locking structure comprises a fixing bolt (4) passing through two groups of double fastening plates (3) and two movable contact knives (2), and a locking nut (41) threadedly connected to the fixing bolt, and the two groups of double fastening plates (3) are relatively locked and pressed against the two movable contact knives (2) by tightening the locking nut (41).

3. The isolating switch contact structure according to claim 2, characterized in that: Each set of double fastening plates (3) comprises an arched bottom plate (31) pressed against the side surface of the movable contact knife (2), and an arched top plate (32) pressed against the outer surface of the arched bottom plate (31), wherein the length of the arched bottom plate (31) is greater than the length of the arched top plate (32).

4. The isolating switch contact structure according to claim 3, characterized in that: The arched bottom plate (31) and the arched top plate (32) are respectively spring structures made of metal materials.

5. The isolating switch contact structure according to claim 4, characterized in that: Connecting holes (33) for the fixing bolts (4) to pass through are respectively provided at the middle positions of the arched bottom plate (31) and the arched top plate (32), and a gap limiting block (5) is provided between the two movable contact knives (2), and the fixing bolts (4) pass through the gap limiting block (5).

6. The isolating switch contact structure according to any one of claims 1 to 5, characterized in that: One end of the two movable contact knives (2) is rotatably arranged on the conductor of the lower connected copper bar through a bolt pair (23), and two contact protrusions (22) protruding toward each other are stamped on the other end of the two movable contact knives (2), and the contact protrusions (22) are in an arc shape. The clamping opening (21) is formed between the two contact protrusions (22), and the double fastening piece (3) is located between the two ends of the movable contact knives.

7. The isolating switch contact structure according to claim 3, characterized in that: The positioning structure comprises first positioning holes (34) respectively arranged on the arched bottom plate (31) and the arched top plate (32), second positioning holes respectively arranged on the two movable contact knives (2) and opposite to the first positioning holes (34), and positioning pins (6) passing through the first positioning holes (34) and the second positioning holes.

8. An isolating switch, characterized in that: The isolating switch contact structure comprises a base frame (7) and the isolating switch contact structure as claimed in any one of claims 1 to 7, wherein three upper connecting copper bars (71) and three lower connecting copper bars (72) are arranged on the base frame (7) relatively, and the isolating switch contact structure comprises three groups of movable contact blades (2) respectively connected to the three lower connecting copper bars (72), and three stationary contacts (1) respectively connected to the three upper connecting copper bars (71), and the stationary contacts (1) and the upper connecting copper bars (71) are formed as an integral structure.

9. The isolating switch according to claim 8, characterized in that: It also includes an operating mechanism for driving the three groups of movable contact knives (2) to contact or separate from the three stationary contacts (1), the operating mechanism including a driving shaft (81) linked to the three groups of movable contact knives (2), a push rod assembly connected to the driving shaft (81), and a driving structure (9) for driving the push rod assembly to reciprocate along its axial direction.

10. The isolating switch according to claim 9, characterized in that: The push rod assembly comprises a push rod member (82) connected to the drive shaft (81), and an adjustment rod (83) movably connected to one end of the push rod member (82) via a threaded structure, and the adjustment rod (83) is connected to the drive structure (9) via a transmission crank arm.

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