A static contact and fuse type isolating switch

Abstract

The present invention provides a stationary contact and a fuse-type disconnector, wherein the stationary contact comprises a stationary contact body and two stationary contact plates respectively connected to the stationary contact body, the two stationary contact plates are opposite to form a slot for inserting a moving contact, the stationary contact plate has a first touch plate portion and a second touch plate portion respectively arranged at both ends in the height direction thereof, and further comprises: an elastic structure, which is suitable for elastically abutting against the first touch plate portion and the second touch plate portion respectively, so that the first touch plate portion and the second touch plate portion are both pressed and connected with the moving contact. Since the first touch plate portion and the second touch plate portion located at the upper and lower ends of the stationary contact plate can be clamped with the moving contact under the elastic force of the elastic structure, compared with the method in which the clamping spring of the prior art only clamps the upper part of the first stationary contact plate, the stationary contact and the moving contact are in "surface contact", the contact area between the two is increased, the contact resistance is small, the temperature rise is reduced, and the reliability of the product is improved.

Description

Technical Field

[0001] The invention relates to the technical field of low-voltage electrical appliances, and in particular to a static contact and a fuse-type isolating switch. Background Art

[0002] Fuse disconnectors are important switchgear in low-voltage power distribution electrical systems. When inspecting and shutting down electrical appliances and devices, fuse disconnectors have a clear disconnection point, which serves to isolate voltage and provide emergency disconnection.

[0003] Existing fuse-type isolating switch static contact, such as Figure 8 As shown, it includes a base plate 03, and a first stationary touch plate 01 and a second stationary touch plate 02 extending upward from both sides of the base plate 03 respectively. The first stationary touch plate 01 and the second stationary touch plate 02 relatively form a slot 05 for inserting the moving contact 04, and the stationary contact is provided with a clamping spring 06 suitable for clamping the first stationary touch plate 01 and the second stationary touch plate 02. The inventors found in actual work that since the retaining spring 06 only clamps the upper part 07 of the first static contact plate 01 and the second static contact plate 02 but not the lower part 08, the cross-section of the slot 05 will be in an "eight" shape, that is, the upper diameter of the slot 05 is small and the lower diameter is large. In this way, when the moving contact 04 is inserted into the slot 05 of the static contact, only the upper part 07 of the first static contact plate 01 and the second static contact plate 02 is in contact with the moving contact 04, and there is a gap between the lower part 08 and the moving contact 04 (the clamping with the moving contact is not firm), that is, there is "line contact" rather than "surface contact" between the static contact and the moving contact. Since the contact area between the dynamic and static contacts is small, the contact resistance is large, the temperature rises, and the reliability of the product is reduced. Summary of the invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defects of the prior art isolating switch that the moving and static contacts have a small contact area, resulting in large contact resistance and temperature rise, thereby providing a static contact with a large contact area and low temperature rise, and a fuse-type isolating switch having the static contact.

[0005] To this end, the present invention provides a stationary contact, comprising a stationary contact body, and two stationary touch plates respectively connected to the stationary contact body, wherein the two stationary touch plates are relatively formed into a slot for inserting a moving contact, and the stationary touch plate has a first touch plate portion and a second touch plate portion respectively arranged at both ends in the height direction thereof, and also includes: an elastic structure, which is suitable for elastically resisting against the first touch plate portion and the second touch plate portion respectively, so that the first touch plate portion and the second touch plate portion are both pressed and connected with the moving contact.

[0006] The stationary contact body includes a base plate and first connecting plates which are arranged on both sides of the base plate and extend upward. The elastic structure includes a second connecting plate which connects the first connecting plate and the second touch plate portion and can apply an elastic force to the second touch plate portion.

[0007] The second connecting plate is wave-shaped.

[0008] The bottom plate, the first connecting plate, the second connecting plate and the stationary contact plate are integrally bent and formed.

[0009] The first connecting plate is formed with a first through hole extending along its height direction, and the bottom plate is formed with a second through hole extending along its length direction and communicating with the first through hole.

[0010] The elastic structure further includes a clamping spring installed on the stationary contact, wherein the clamping spring has a first elastic arm elastically abutting against the first contact plate portion of the stationary contact plate, and a second elastic arm elastically abutting against the second contact plate portion.

[0011] The first elastic arm and the second elastic arm are connected to form an arc-shaped elastic arm. The clamping spring includes an arc-shaped clamping spring body and two elastic arms respectively arranged at two ends of the notch of the clamping spring body. The middle part of the elastic arm is connected to the clamping spring body.

[0012] The stationary touch plate is provided with grooves respectively abutting against the end of the first elastic arm and the end of the second elastic arm.

[0013] The contact surfaces of the first elastic arm and the second elastic arm with the stationary touch plate are both arc surfaces.

[0014] The present invention provides a fuse type isolating switch, comprising the static contact as described above.

[0015] The technical solution of the present invention has the following advantages:

[0016] 1. The stationary contact provided by the present invention has an elastic structure that can elastically resist the first touch plate portion and the second touch plate portion at the upper and lower ends of the stationary contact respectively, so that the first touch plate portion and the second touch plate portion are both pressed and connected with the moving contact. Compared with the prior art in which the clip spring only clamps the upper part of the first stationary touch plate, the stationary contact and the moving contact are in "surface contact", which increases the contact area between the two, reduces the contact resistance, reduces the temperature rise, and improves the reliability of the product.

[0017] 2. The static contact provided by the present invention has an elastic structure including a second connecting plate that connects the first connecting plate and the second touch plate portion and can apply an elastic force to the second touch plate portion, so that the second connecting plate not only connects the first connecting plate and the contact plate, but also applies an elastic force to the second touch plate portion to press the moving contact with the moving contact when the moving contact is inserted into the slot. The second connecting plate has the advantage of a simple structure; further, the wavy second connecting plate has the advantage of a large elastic effect.

[0018] 3. The static contact provided by the present invention, the bottom plate, the first connecting plate, the second connecting plate and the static contact plate are integrally bent and formed, which has the advantages of simple structure and convenient subsequent assembly.

[0019] 4. The static contact provided by the present invention has a retaining spring having a first elastic arm elastically resisting the first touch plate portion of the static touch plate, and a second elastic arm elastically resisting the second touch plate portion. By providing the first elastic arm and the second elastic arm, the first touch plate portion and the second touch plate portion are both pressed and connected with the moving contact, thereby increasing the contact area between the moving and static contacts, reducing the contact resistance, reducing the temperature rise, and improving the reliability of the product. In addition, the retaining spring has the advantages of simple structure and easy assembly.

[0020] 5. The static contact provided by the present invention comprises a first elastic arm and a second elastic arm connected to form an arc-shaped elastic arm, and the retaining spring comprises an arc-shaped retaining spring body, and two elastic arms respectively arranged at both ends of a notch of the retaining spring body. Since the middle portion of the elastic arm is connected to the retaining spring body, the first elastic arm and the second elastic arm apply elastic forces of the same magnitude to the corresponding first touch plate portion and the second touch plate portion, thereby ensuring that the upper and lower diameters of the slot are consistent. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] 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.

[0022] Figure 1 is a stereoscopic diagram of a first embodiment of a stationary contact of the present invention;

[0023] Figure 2 for Figure 1 The main view;

[0024] Figure 3 for Figure 2 Schematic diagram of the structure after removing the retaining spring;

[0025] Figure 4is a stereoscopic diagram of a second embodiment of a stationary contact of the present invention;

[0026] Figure 5 It is a schematic diagram of the structure of the clip spring in the second embodiment and the third embodiment of the stationary contact;

[0027] Figure 6 is a stereoscopic diagram of a third embodiment of a stationary contact of the present invention;

[0028] Figure 7 for Figure 6 The main view;

[0029] Figure 8 The present invention is a schematic diagram of the structure of a static contact of a fuse-type isolating switch in the prior art.

[0030] Description of reference numerals: 01, first stationary contact plate; 02, second stationary contact plate; 03, bottom plate; 04, moving contact; 05, slot; 06, retaining spring; 07, upper part; 08, lower part;

[0031] 1. Stationary contact body; 2. Stationary contact plate; 20. Slot; 21. First contact plate portion; 22. Second contact plate portion; 23. Groove; 3. Bottom plate; 31. Second through hole; 4. First connecting plate; 41. First through hole; 5. Second connecting plate; 6. Clip; 60. Clip body; 61. First elastic arm; 62. Second elastic arm. DETAILED DESCRIPTION

[0032] 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.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] Example 1

[0037] This embodiment provides a fuse-type isolating switch, which includes a switch body and a static contact arranged on the switch body, such as Figure 1-3 As shown, the stationary contact comprises a stationary contact body 1, two stationary contact plates 2 and an elastic structure.

[0038] Static contact body 1, such as Figure 1 and 2 As shown, it includes a bottom plate 3, and first connecting plates 4 arranged on both sides of the bottom plate 3 and extending upward. The first connecting plate 4 is formed with a first through hole 41 extending along its height direction, and the bottom plate 3 is formed with a second through hole 31 extending along its length direction and connected to the first through hole 41, and the first through hole 41 and the second through hole 31 are used for heat dissipation.

[0039] There are two stationary contact plates 2. The two stationary contact plates 2 are opposite to each other to form a slot 20 for inserting the moving contact. The stationary contact plates 2 have a first contact plate portion 21 and a second contact plate portion 22 respectively arranged at two ends in the height direction thereof.

[0040] The elastic structure is suitable for elastically resisting the first touch plate portion 21 and the second touch plate portion 22 respectively, so that the first touch plate portion 21 and the second touch plate portion 22 are both pressed and connected with the moving contact, and the elastic structure includes a second connecting plate 5 and a clamping spring 6.

[0041] The second connecting plate 5 connects the first connecting plate 4 and the second touch plate portion 22, and can apply an elastic force to the second touch plate portion 22. Figure 3 As shown, the second connecting plate 5 is wavy, and the bottom plate 3, the first connecting plate 4, the second connecting plate 5 and the static contact plate 2 are integrally bent and formed.

[0042] As a convertible embodiment, the second connecting plate 5 is U-shaped.

[0043] The clamping spring 6 is mounted on the stationary contact and has a first elastic arm 61 elastically abutting against the first contact plate portion 21 of the stationary contact plate 2 .

[0044] Example 2

[0045] This embodiment provides a fuse-type isolating switch, which includes a switch body and a static contact arranged on the switch body, such as Figure 4 As shown, the stationary contact comprises a stationary contact body 1, two stationary contact plates 2 and an elastic structure.

[0046] The stationary contact body 1 includes a bottom plate 3 and first connecting plates 4 which are arranged on both sides of the bottom plate 3 and extend upward. The first connecting plate 4 is connected to the stationary contact plate 2 via a second connecting plate 5 .

[0047] There are two stationary touch plates 2, and the two stationary touch plates 2 are opposite to each other to form a slot 20 for inserting the moving contact, and the stationary touch plate 2 has a first touch plate portion 21 and a second touch plate portion 22 respectively arranged at both ends in the height direction thereof. The stationary touch plate 2 is provided with grooves 23 respectively abutting against the ends of the first elastic arm 61 and the second elastic arm 62, and the grooves 23 are used to limit the positions of the ends of the elastic arms.

[0048] The elastic structure is suitable for elastically resisting the first touch plate portion 21 and the second touch plate portion 22 respectively, so that the first touch plate portion 21 and the second touch plate portion 22 are both pressed and connected with the moving contact. In this embodiment, the elastic structure is a clip spring 6.

[0049] Circlip 6, such as Figure 5 As shown, it has a first elastic arm 61 elastically abutting against the first touch plate portion 21 of the stationary touch plate 2, and a second elastic arm 62 elastically abutting against the second touch plate portion 22. The first elastic arm 61 and the second elastic arm 62 are connected to form an arc-shaped elastic arm, and the clamping spring 6 includes an arc-shaped clamping spring body 60 and two elastic arms respectively arranged at both ends of the notch of the clamping spring body 60, and the middle part of the elastic arm is connected to the clamping spring body 60. The contact surfaces of the first elastic arm 61 and the second elastic arm 62 with the stationary touch plate 2 are both arc surfaces.

[0050] Example 3

[0051] This embodiment provides a fuse-type isolating switch, which includes a switch body and a static contact arranged on the switch body, such as Figure 6 and 7 As shown, the stationary contact comprises a stationary contact body 1, two stationary contact plates 2 and an elastic structure.

[0052] The static contact body 1 includes a bottom plate 3 and first connecting plates 4 disposed on both sides of the bottom plate 3 and extending upward. The first connecting plate 4 is formed with a first through hole 41 extending along its height direction, and the bottom plate 3 is formed with a second through hole 31 extending along its length direction and communicating with the first through hole 41, and the first through hole 41 and the second through hole 31 are used for heat dissipation.

[0053] There are two stationary touch plates 2, and the two stationary touch plates 2 are opposite to each other to form a slot 20 for inserting the moving contact, and the stationary touch plate 2 has a first touch plate portion 21 and a second touch plate portion 22 respectively arranged at both ends in the height direction thereof. The stationary touch plates 2 are respectively provided with grooves 23 that abut against the ends of the first elastic arm 61 and the second elastic arm 62.

[0054] The elastic structure is suitable for elastically resisting the first touch plate portion 21 and the second touch plate portion 22 respectively, so that the first touch plate portion 21 and the second touch plate portion 22 are both pressed and connected with the moving contact, and the elastic structure includes a second connecting plate 5 and a clamping spring 6.

[0055] The second connecting plate 5 connects the first connecting plate 4 and the second touch plate portion 22, and can apply an elastic force to the second touch plate portion 22. In this embodiment, the second connecting plate 5 is wavy, and the bottom plate 3, the first connecting plate 4, the second connecting plate 5 and the stationary touch plate 2 are integrally bent and formed.

[0056] As a convertible embodiment, the second connecting plate 5 is U-shaped.

[0057] The retaining spring 6 is installed on the static contact, such as Figure 5 As shown, it has a first elastic arm 61 elastically abutting against the first touch plate portion 21 of the stationary touch plate 2, and a second elastic arm 62 elastically abutting against the second touch plate portion 22. The first elastic arm 61 and the second elastic arm 62 are connected to form an arc-shaped elastic arm, and the clamping spring 6 includes an arc-shaped clamping spring body 60, and two elastic arms respectively arranged at both ends of the notch of the clamping spring body 60, and the middle part of the elastic arm is connected to the clamping spring body 60. The contact surfaces of the first elastic arm 61 and the second elastic arm 62 with the stationary touch plate 2 are both arc surfaces, thereby reducing friction with the stationary touch plate 2 and extending the service life of the stationary contact.

[0058] 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 present invention.

Claims

1. A stationary contact, comprising a stationary contact body (1), and two stationary contact plates (2) respectively connected to the stationary contact body (1), wherein the two stationary contact plates (2) are opposite to each other to form a slot (20) for inserting a moving contact, and the stationary contact plate (2) has a first contact plate portion (21) and a second contact plate portion (22) respectively arranged at two ends in a height direction thereof, characterized in that: Also includes: An elastic structure, adapted to elastically abut against the first touch plate portion (21) and the second touch plate portion (22), respectively, so that the first touch plate portion (21) and the second touch plate portion (22) are both pressed and connected with the moving contact; The elastic structure further comprises a clamping spring (6) mounted on the stationary contact, wherein the clamping spring (6) comprises a first elastic arm (61) elastically abutting against the first contact plate portion (21) of the stationary contact plate (2); The clamping spring (6) also has a second elastic arm (62) elastically abutting against the second touch plate portion (22); The first elastic arm (61) and the second elastic arm (62) are connected to form an arc-shaped elastic arm, and the retaining spring (6) comprises an arc-shaped retaining spring body (60) and two elastic arms respectively arranged at two ends of the notch of the retaining spring body (60), and the middle part of the elastic arm is connected to the retaining spring body (60).

2. The stationary contact according to claim 1, characterized in that: The stationary contact body (1) comprises a base plate (3) and a first connecting plate (4) which is arranged on both sides of the base plate (3) and extends upward, and the elastic structure comprises a second connecting plate (5) which connects the first connecting plate (4) and the second touch plate portion (22) and can apply an elastic force to the second touch plate portion (22).

3. The stationary contact according to claim 2, characterized in that: The second connecting plate (5) is wave-shaped.

4. The stationary contact according to claim 2 or 3, characterized in that: The bottom plate (3), the first connecting plate (4), the second connecting plate (5) and the stationary contact plate (2) are integrally formed by bending.

5. The stationary contact according to claim 4, characterized in that: The stationary contact plate (2) is provided with grooves (23) respectively abutting against the end of the first elastic arm (61) and the end of the second elastic arm (62).

6. The stationary contact according to claim 5, characterized in that: The contact surfaces between the first elastic arm (61) and the second elastic arm (62) and the stationary touch plate (2) are both arc surfaces.

7. A fuse-type disconnect switch, characterized in that: Comprising a stationary contact as claimed in any one of claims 1 to 6.

Images