A two-station double-break isolating switch

Abstract

The present invention provides a two-station double-break disconnector, comprising: two contact blades, which can be installed on the switch body in a linear manner up and down; a main shaft, which is rotatably installed on the switch body and drives the two contact blades to move in opposite directions through a gear rack assembly; a first static contact and a second static contact, which are arranged on the switch body up and down, and both have a first slot for the corresponding contact blade to be inserted, and a straight conductive spring is installed on the inner wall of the first slot, and the length extension direction of the straight conductive spring is arranged parallel to the contact blade surface on the side of the contact blade, wherein when the contact blade is inserted into the first slot, the side of the straight conductive spring is squeezed by the contact blade surface and is in close contact with it. When the switch is in the closed position, the two contact blades are respectively in contact and connected with the corresponding static contacts; when the switch is opened, the main shaft drives the two contact blades to move in opposite directions through the gear rack assembly, so that the two contact blades are disconnected from the corresponding separation, thereby forming a double break, which has higher safety performance.

Description

Technical Field

[0001] The invention relates to the technical field of switches, and in particular to a two-station double-break isolating switch. Background Art

[0002] The existing isolating switch includes a blade, an isolating static contact and a grounding static contact. The blade is arranged on a main shaft and driven by the main shaft to rotate, thereby contacting or disconnecting with the isolating static contact and the grounding static contact respectively. Since the blade is rotated, the width of the cabinet is relatively large, which increases the cost of the cabinet. In addition, Chinese patent document CN108511212A discloses a high-voltage switch contact blade assembly and a high-voltage switch, such as Fig.10 As shown, it includes a stationary contact 01 and a contact blade assembly, and the contact blade assembly includes two blades 02 arranged opposite to each other, and an insertion space for inserting the stationary contact 01 is formed between the two blades 02. The two blades 02 are penetrated by a support rod 03, and both ends of the support rod 03 are respectively installed on the outer sides of the two blades 02 with springs 04 that provide a force for the two blades 02 to move closer to each other. Since the three-phase contacts A, B, and C need to maintain a suitable phase-to-phase distance to ensure electrical insulation performance, the existence of the support rod 03 makes the entire switch larger in size, increasing the production cost. Summary of the invention

[0003] Therefore, the technical problem to be solved by the present invention is to overcome the defect of large size of the large current isolating switch in the prior art, thereby providing a two-station double-break isolating switch with small size and high safety.

[0004] To this end, the present invention provides a two-station double-break isolating switch, comprising two contacts, a main shaft and two stationary contacts, wherein the two contacts are installed on a switch body so as to be movable up and down in a straight line; the main shaft is rotatably installed on the switch body, and drives the two contacts to move in opposite directions through a gear rack assembly; the first stationary contact and the second stationary contact are arranged on the switch body in an upper and lower manner, and both have a first slot for inserting the corresponding contacts, and a straight conductive spring is installed on the inner wall of the first slot, and the length extension direction of the straight conductive spring is arranged parallel to the contact surface on the side of the contact, wherein when the contact is inserted into the first slot, the side surface of the straight conductive spring is squeezed by the contact surface and is in close contact with it.

[0005] The cross-section of the straight conductive spring is elliptical, and an installation groove for installing the straight conductive spring is provided on the inner wall of the first slot, and the installation groove has a first contact surface arranged parallel to the moving direction of the touch knife, and a second contact surface and a third contact surface arranged on the upper and lower sides of the first contact surface and inclined to it, wherein when one side surface of the elliptical straight conductive spring is squeezed by the touch knife, the other side surface thereof is in contact with the first contact surface, the second contact surface and the third contact surface respectively.

[0006] The contact blade has a contact section and a connecting section that are connected to each other, and the width of the contact section is greater than the width of the connecting section. In the open state, the connecting section is located in the first slot and has a gap between it and the straight conductive spring; in the closed state, the contact section is located in the first slot and fits against the straight conductive spring.

[0007] The first stationary contact and the second stationary contact each have two groups of the straight conductive springs located on both sides of the first slot, and each group includes a plurality of the straight conductive springs spaced apart and distributed along the moving direction of the contact knife.

[0008] The rack and pinion assembly includes a gear, a first connecting plate and a second connecting plate. The gear is fixed on the main shaft and rotates in conjunction with the main shaft. The first connecting plate and the second connecting plate respectively have a first rack and a second rack located on both sides of the rotation center of the gear and meshing with the gear. The first rack and the second rack are arranged in parallel. One of the contact knives is fixedly installed on the top of the first connecting plate, and the other contact knife is fixedly installed on the bottom of the second connecting plate.

[0009] The first connecting plate and the second connecting plate are both provided with a long hole extending in the vertical direction and for the gear to pass through, and the first rack or the second rack is provided on the inner wall of the long hole.

[0010] The first connecting plate and the second connecting plate are both formed with a second slot for the stylus blade to be inserted into. After the stylus blade is inserted into the second slot, it is fixed to the connecting plate by screws.

[0011] A sealed pole is provided in the switch body, and the sealed pole includes an insulating cover and a vacuum arc extinguishing chamber located in the insulating cover. The vacuum arc extinguishing chamber has a static conductive end arranged on the top and a dynamic conductive end arranged on the bottom. The static conductive end is electrically connected to the first static contact, and the dynamic conductive end is electrically connected to the second static contact.

[0012] The technical solution of the present invention has the following advantages:

[0013] 1. The two-station double-break disconnector provided by the present invention comprises two contact knives, a main shaft, a gear rack assembly, a first static contact and a second static contact. When in the closed position, the two contact knives are respectively in contact and connected with the corresponding first static contact and the second static contact; when opening the switch, the main shaft drives the two contact knives to move in opposite directions through the gear rack assembly, so that the two contact knives are separated and disconnected from the corresponding first static contact and the second static contact, thereby forming a double break, which has higher safety performance; a straight conductive spring is installed on the inner wall of the first slot of the first static contact and the second static contact, and the length extension direction of the straight conductive spring is arranged parallel to the contact surface of the side of the contact knife, wherein when the contact knife is inserted into the first slot, the side surface of the straight conductive spring is squeezed by the contact surface and is in close contact with it, and the straight conductive spring is used not only for providing contact pressure, but also for between the static contact and the contact knife. The conductive connection of the straight conductive spring can increase the contact area between the static contact and the contact blade by a small amount when the current increases, and the contact pressure increased in this way is small, making the contact process of opening and closing the switch more labor-saving; in addition, since the setting direction of the straight conductive spring is parallel to the contact blade surface on the side of the contact blade, the increase in the length of the straight conductive spring does not increase the width of each phase contact. Under the condition of ensuring the electrical gap between the two adjacent phase contacts, the switch body is smaller in size and reduces the cost compared with the prior art; in addition, when the main shaft drives the contact blade to move up and down through the gear rack assembly, the opening and closing of the isolating switch can be realized. Since the contact blade adopts a linear reciprocating movement, compared with the prior art method of realizing opening and closing by rotating the contact blade, this occupies less space, further reducing the cost of the switch body.

[0014] 2. The two-station double-break isolating switch provided by the present invention has an elliptical cross-section of the straight conductive spring, and an installation groove for installing the straight conductive spring is provided on the inner wall of the slot, the installation groove having a first contact surface arranged parallel to the moving direction of the touch knife, and a second contact surface and a third contact surface arranged on the upper and lower sides of the first contact surface and inclined to the first contact surface, wherein when one side surface of the elliptical straight conductive spring is squeezed by the touch knife, the other side surface thereof is in contact with the first contact surface, the second contact surface and the third contact surface respectively, so that the contact points between the straight conductive spring and the touch knife are increased by at least twice, thereby reducing the contact resistance, increasing the conductivity, and reducing the temperature rise, and the three-point contact makes the positioning of the straight conductive spring more accurate, thereby ensuring the connection reliability.

[0015] 3. The two-station double-break isolating switch provided by the present invention has a contact knife having a contact section and a connecting section that are connected to each other, and the width of the contact section is greater than the width of the connecting section. In the closed state, the contact section is located in the first slot and fits against the straight conductive spring, thereby ensuring that there is a certain contact pressure between the static contact and the contact knife; when the switch needs to be opened, the contact section of the contact knife is separated from the straight conductive spring, and because the width of the connecting section is smaller than the width of the contact section, there is a gap between the connecting section and the straight conductive spring, thereby reducing the driving force requirement of the power mechanism that drives the contact knife to move, and also reducing the cost of the contact knife. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the specific implementation methods of the present invention 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 present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 It is a three-dimensional diagram of a two-station double-break disconnector of the present invention;

[0018] Figure 2 A three-dimensional diagram of one phase contact assembly and a sealed pole;

[0019] Figure 3 It is a schematic diagram of the structure of one phase contact assembly and the sealed pole (after removing the insulating cover);

[0020] Figure 4 A first stereoscopic view of the main shaft, the rack and pinion assembly, and the contact assembly;

[0021] Figure 5 A second perspective view of the main shaft, the rack and pinion assembly, and the contact assembly;

[0022] Figure 6 It is a schematic diagram of the exploded structure of the main shaft, the gear rack assembly and the contact assembly;

[0023] Figure 7 It is a structural schematic diagram of the contact assembly in the closed state;

[0024] Figure 8 It is a structural schematic diagram of the contact assembly in the open state;

[0025] Fig. 9 It is a schematic diagram of the explosion structure of the first static contact and the straight conductive spring;

[0026] Fig.10 It is a schematic diagram of the structure of a stationary contact and a contact blade assembly in the prior art.

[0027] Description of reference numerals: 01, static contact; 02, blade; 03, support rod; 04, spring;

[0028] 1. Contact knife; 2. Main shaft; 4. First slot; 5. Straight conductive spring; 6. Contact knife surface; 7. Mounting slot; 8. First contact surface; 9. Second contact surface; 10. Third contact surface; 11. Contact section; 12. Connecting section; 13. Gear; 15. First connecting plate; 16. Second connecting plate; 17. First rack; 18. Second rack; 19. Long hole; 20. Second slot; 21. Sealed pole; 22. Insulating cover; 23. Vacuum arc extinguishing chamber; 24. Static conductive end; 25. Moving conductive end; 26. Switch body; 31. First static contact; 32. Second static contact. DETAILED DESCRIPTION

[0029] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0031] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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.

[0032] 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.

[0033] Example

[0034] This embodiment provides a two-station double-break isolating switch, such as Figure 1 As shown, it includes a switch body 26 , and two contact knives 1 , a main shaft 2 , a first static contact 31 , a second static contact 32 and a sealed pole 21 arranged on the switch body 26 .

[0035] Two contact knives 1 are mounted on the switch body 26 so as to be movable up and down. Figure 2 , Figure 7 and Figure 8 As shown, the contact blade 1 has a contact segment 11 and a connecting segment 12 connected to each other, the width of the contact segment 11 is greater than the width of the connecting segment 12, wherein, as shown Figure 8 In the open state shown in FIG. 1 , the connecting section 12 is located in the first slot 4 and there is a gap between the connecting section 12 and the straight conductive spring 5; Figure 7 In the closed state shown, the contact segment 11 is located in the first slot 4 and fits against the straight conductive spring 5 .

[0036] The main shaft 2 is rotatably mounted on the switch body 26 and drives the two contact knives 1 to move in opposite directions through a gear rack assembly. Figure 4 , Figure 5 ,and Figure 6 As shown, the gear rack assembly includes: a gear 13, which is fixed on the main shaft 2 and rotates in conjunction with the main shaft 2; a first connecting plate 15 and a second connecting plate 16, which respectively have a first rack 17 and a second rack 18 located on both sides of the rotation center of the gear 13 and meshed with the gear 13, the first rack 17 and the second rack 18 are arranged in parallel, one of the touch knives 1 is fixedly installed on the top of the first connecting plate 15, and another touch knives 1 is fixedly installed on the bottom of the second connecting plate 16. The first connecting plate 15 and the second connecting plate 16 are both provided with a long hole 19 extending vertically and for the gear 13 to pass through, and the inner wall of the long hole 19 is provided with the first rack 17 or the second rack 18, and the first connecting plate 15 and the second connecting plate 16 are both formed with a second slot 20 for the touch knives 1 to be inserted, and after the touch knives 1 are inserted into the second slot 20, they are fixed to the connecting plate by screws.

[0037] The first stationary contact 31 and the second stationary contact 32 are disposed on the switch body 26 in an upper and lower manner and have a first slot 4 for the corresponding contact blade 1 to be inserted. Fig. 9 As shown, a straight conductive spring 5 is installed on the inner wall of the first slot 4, and the length extension direction of the straight conductive spring 5 is arranged parallel to the touch blade surface 6 on the side of the touch blade 1, wherein when the touch blade 1 is inserted into the first slot 4, the side of the straight conductive spring 5 is squeezed by the touch blade surface 6 and is in close contact with it. In this embodiment, Figure 7 and Figure 8As shown, the cross section of the straight conductive spring 5 is elliptical, and the inner wall of the first slot 4 is provided with a mounting groove 7 for mounting the straight conductive spring 5, and the mounting groove 7 has a first contact surface 8 arranged parallel to the moving direction of the touch knife 1, and a second contact surface 9 and a third contact surface 10 arranged on the upper and lower sides of the first contact surface 8 and inclined to it, wherein when one side of the elliptical straight conductive spring 5 is squeezed by the touch knife 1, the other side thereof is in contact with the first contact surface 8, the second contact surface 9 and the third contact surface 10 respectively. The first static contact 31 and the second static contact 32 both have two groups of the straight conductive springs 5 ​​located on both sides of the first slot 4, and each group includes a plurality of the straight conductive springs 5 ​​spaced apart along the moving direction of the touch knife 1. It should be noted that the structures of the first static contact 31 and the second static contact 32 can be the same.

[0038] The sealed pole 21, such as Figure 2 and Figure 3 As shown, it includes an insulating cover 22 and a vacuum arc extinguishing chamber 23 located in the insulating cover 22, wherein the vacuum arc extinguishing chamber 23 has a static conductive end 24 arranged on the top and a dynamic conductive end 25 arranged on the bottom, wherein the static conductive end 24 is electrically connected to the first static contact 31, and the dynamic conductive end 25 is electrically connected to the second static contact 32.

[0039] The working principle of the two-station double-break disconnector of the present application is as follows:

[0040] like Figure 4 and Figure 8 As shown, the isolating switch is in the open state, and there is a gap between the connecting section 12 of the contact blade 1 and the straight conductive spring 5 on the first static contact 31 and the second static contact 32; when it is necessary to close the switch, the main shaft 2 drives the gear 13 to rotate, and the first rack 17 and the second rack 18 are engaged with the gear 13. The first rack 17 drives the contact blade 1 arranged on the upper side to move downward under the drive of the gear 13, and the second rack 18 drives the second rack 18 arranged on the lower side to move upward under the drive of the gear 13, as shown in FIG. Figure 7 As shown, the contact segments 11 of the two contact blades 1 are brought into contact and connected with the straight conductive springs 5 ​​of the corresponding contact blades 1; when the switch needs to be opened, the main shaft 2 drives the gear 13 to rotate in the opposite direction, and the first rack 17 drives the contact blade 1 arranged on the upper side to move upward under the drive of the gear 13, and the second rack 18 drives the second rack 18 arranged on the lower side to move downward under the drive of the gear 13, thereby separating and disconnecting the contact segments 11 of the two contact blades 1 from the straight conductive springs 5 ​​of the corresponding contact blades 1.

[0041] The two-station double-break disconnector of the present invention, when in the closed position, the two contact blades 1 are respectively in contact and connected with the corresponding two first static contacts 31 and the second static contacts 32; when opening, the main shaft 2 drives the two contact blades 1 to move in opposite directions through the gear rack assembly, so that the two contact blades 1 are separated and disconnected from the corresponding first static contacts 31 and the second static contacts 32, thereby forming a double break, which has higher safety performance; a straight conductive spring 5 is installed on the inner wall of the first slot 4 of the first static contact 31 and the second static contact 32, and the length extension direction of the straight conductive spring 5 is arranged parallel to the contact blade surface on the side of the contact blade 1, wherein, when the contact blade 1 is inserted into the first slot 4, the side surface of the straight conductive spring 5 is squeezed by the contact blade surface 6 and is in close contact with it, and the straight conductive spring 5 is used not only for providing contact pressure, but also for the first static contact 31 and the second static contact 32 and the contact blade 1. Conductive connection, when the current increases, only a small increase in the length of the straight conductive spring 5 is needed to increase the contact area between the static contact and the contact blade 1, and the contact pressure increased in this way is small, making the contact process of opening and closing more labor-saving; in addition, since the setting direction of the straight conductive spring 5 is parallel to the contact blade surface 6 on the side of the contact blade 1, the increase in the length of the straight conductive spring 5 will not increase the width of each phase contact. Under the condition of ensuring the electrical gap between the adjacent two-phase contacts, compared with the prior art, the size of the switch body is smaller and the cost is reduced; in addition, when the main shaft 2 drives the contact blade 1 to move up and down through the gear rack assembly, the opening and closing of the isolating switch can be realized. Since the contact blade adopts a linear reciprocating movement, compared with the prior art that the contact blade adopts a rotation to realize the opening and closing, this occupies less space, further reducing the cost of the switch body.

[0042] 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.

Claims

1. A two-station double-break isolating switch, characterized in that: include: Two contact knives (1) are mounted on the switch body (26) so as to be movable vertically; A main shaft (2) is rotatably mounted on the switch body (26) and drives the two contact knives (1) to move in opposite directions via a gear rack assembly; The first stationary contact (31) and the second stationary contact (32) are arranged on the switch body (26) in an upper and lower manner, and each has a first slot (4) for the corresponding contact blade (1) to be inserted, a straight conductive spring (5) is installed on the inner wall of the first slot (4), and the length extension direction of the straight conductive spring (5) is arranged parallel to the contact blade surface (6) on the side of the contact blade (1), wherein when the contact blade (1) is inserted into the first slot (4), the side surface of the straight conductive spring (5) is pressed by the contact blade surface (6) and is in close contact with it; The contact blade (1) comprises a contact section (11) and a connecting section (12) which are connected to each other, the width of the contact section (11) being greater than the width of the connecting section (12), wherein, in an open state, the connecting section (12) is located in the first slot (4) and has a gap with the straight conductive spring (5); in a closed state, the contact section (11) is located in the first slot (4) and fits against the straight conductive spring (5).

2. The two-station double-break disconnector according to claim 1 is characterized in that: The cross section of the straight conductive spring (5) is elliptical. The inner wall of the first slot (4) is provided with a mounting groove (7) for mounting the straight conductive spring (5). The mounting groove (7) has a first contact surface (8) arranged parallel to the moving direction of the touch knife (1), and a second contact surface (9) and a third contact surface (10) arranged on the upper and lower sides of the first contact surface (8) and inclined thereto. When one side surface of the elliptical straight conductive spring (5) is squeezed by the touch knife (1), the other side surface thereof is in contact with the first contact surface (8), the second contact surface (9) and the third contact surface (10), respectively.

3. The two-station double-break disconnector according to claim 2 is characterized in that: The first stationary contact (31) and the second stationary contact (32) each have two groups of the straight conductive springs (5) located on both sides of the first slot (4), and each group includes a plurality of the straight conductive springs (5) spaced apart along the moving direction of the contact blade (1).

4. The two-station double-break disconnector according to claim 1 is characterized in that: The rack and pinion assembly comprises: A gear (13) is fixed on the main shaft (2) and rotates in conjunction with the main shaft (2); The first connecting plate (15) and the second connecting plate (16) respectively have a first rack (17) and a second rack (18) located on both sides of the rotation center of the gear (13) and meshingly connected with the gear (13); the first rack (17) and the second rack (18) are arranged in parallel; one of the contact knives (1) is fixedly mounted on the top of the first connecting plate (15); and the other of the contact knives (1) is fixedly mounted on the bottom of the second connecting plate (16).

5. The two-station double-break disconnector according to claim 4 is characterized in that: The first connecting plate (15) and the second connecting plate (16) are both provided with a long hole (19) extending vertically and for the gear (13) to pass through, and the first rack (17) or the second rack (18) is provided on the inner wall of the long hole (19).

6. The two-station double-break disconnector according to claim 4 or 5, characterized in that: The first connecting plate (15) and the second connecting plate (16) are both formed with a second slot (20) for the contact knife (1) to be inserted into; after the contact knife (1) is inserted into the second slot (20), it is fixed to the connecting plate by means of screws.

7. The two-station double-break disconnector according to claim 1 is characterized in that: A sealed pole (21) is provided in the switch body (26), the sealed pole (21) comprising an insulating cover (22) and a vacuum arc extinguishing chamber (23) located in the insulating cover (22), the vacuum arc extinguishing chamber (23) having a static conductive end (24) arranged on the top and a dynamic conductive end (25) arranged on the bottom, the static conductive end (24) being electrically connected to a first static contact (31), and the dynamic conductive end (25) being electrically connected to a second static contact (32).

Images