Lightning arrester adopting novel assembly design and switch equipment with lightning arrester

Abstract

The utility model relates to a lightning arrester adopting a novel assembly design and a switch device with the lightning arrester, the lightning arrester comprises an insulation shell, an installation cavity in the insulation shell is divided into a first installation part section and a second installation part section along the vertical direction, and at least the part which forms the first installation part section in a surrounding manner in the insulation shell is made of an elastic material; the first conductive terminal is embedded in the insulating shell and vertically extends above the first mounting section; the second conductive terminal is configured to be detachably mounted in the second mounting section of the insulating shell; the conductive core body vertically extends in the first mounting section of the insulating shell, and the vertical size of the conductive core body is larger than the vertical distance between the lower end of the first conductive terminal and the upper end of the second conductive terminal when the first mounting section is in a natural state; therefore, the conductive core body can overcome the elastic force of the first installation part section in the stretching state to be clamped between the lower end of the first conductive terminal and the upper end of the second conductive terminal.

Description

TECHNICAL FIELD

[0001] The utility model relates to electrical equipment technical field especially relates to the lightning arrester and switchgear with the lightning arrester of novel assembly design are adopted. BACKGROUND

[0002] Lightning arrester is widely used in various switchgears such as switch cabinet or transformer cabinet as the key equipment limiting overvoltage. Under normal operating voltage conditions, lightning arrester only allows weak current of microampere to milliamper level to pass through, and when high voltage condition is encountered, its resistance sharply drops to allow high voltage current to pass through. Based on the characteristics of lightning arrester, lightning arrester can be used in parallel with the main part of switchgear, once the switchgear faces lightning impulse or operating impulse and other transient overvoltage, lightning arrester can guide the high voltage current to the ground, thereby effectively protecting the main part of switchgear from damage.

[0003] The lightning arrester in prior art usually includes insulating shell, conductive core body put into the insulating shell from the axial opening side of the insulating shell and fastening component installed to the opening side of the insulating shell to press the conductive core body to the insulating shell, but the fastening component can include pad installed to the axial opening side of the insulating shell and fastening bolt through the pad to abut to the conductive core body, obviously this will cause the defects of complicated operation and large overall size of lightning arrester, thereby causing the problem that the lightning arrester cannot be applied to compact switchgear.

[0004] Therefore, there is a demand for explosion-proof lightning arrester with simple assembly, compact size and wider applicability in the field. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a lightning arrester that can at least solve part of the above problems.

[0006] The utility model also aims at providing a switchgear applying the improved lightning arrester

[0007] According to one aspect of the utility model, a kind of lightning arrester of novel assembly design is provided, it is characterized in that, the lightning arrester includes: insulating shell, its inside is equipped with along vertical extension and with outside environment communication installation cavity, the installation cavity is divided into first installation section and the second installation section located in the lower side of the first installation section and with outside environment communication, wherein at least the part of the insulating shell that is enclosed to form the first installation section is made of elastic material, to allow the first installation section can be in natural state or stretched state;First conductive terminal, it is embedded in the inside of the insulating shell and in the upper side of the first installation section along vertical extension, the lower end of the first conductive terminal extends to with the upper end of the first installation section flush or extends to enter the upper portion of the first installation section;Second conductive terminal, it is configured to be able to be installed in the second installation section of the insulating shell in detachable way, the upper end of the second conductive terminal extends to with the upper end of the second installation section flush or enters the lower portion of the first installation section along vertical;Conductive core, it is in the first installation section of the insulating shell along vertical extension, wherein the vertical dimension of the conductive core is greater than the vertical spacing of the lower end of the first conductive terminal and the upper end of the second conductive terminal in the first installation section in natural state, to make the conductive core can be clamped between the lower end of the first conductive terminal and the upper end of the second conductive terminal by overcoming the elastic force of the first installation section in stretched state.

[0008] Compared with prior art, the lightning arrester in the utility model by ingenious design the vertical dimension between the conductive core relative to the first conductive terminal and the second conductive terminal in the insulating shell, so that the conductive core can be tightly pressed between the first conductive terminal and the second conductive terminal by the elastic force of the insulating shell, and the structure design is ingenious and does not need additional fastener to realize the connection between the second conductive terminal and the insulating shell.In addition, the second conductive terminal is installed in the second installation section of the insulating shell located in the lower side of the first installation section in detachable way, so that in the case of accidental high pressure impact, the second conductive terminal can be disengaged from the insulating shell to allow high temperature and high pressure gas to be directed from the lower side of the insulating shell, which can greatly improve the safety and reliability of the lightning arrester in the utility model.

[0009] Preferably, the lightning arrester further includes a tab arranged at the lower portion of the outer periphery of the portion of the insulating shell enclosing the first installation section.

[0010] Preferably, the second conductive terminal is configured to extend upward to flush with the upper end of the second installation section and downward to be spaced apart from the lower end of the second installation section without exceeding the second installation section.

[0011] Preferably, the second conductive terminal is engaged into the second installation section of the insulating shell in a form-fitting manner.

[0012] Preferably, the lower end surface of the first electrically conductive terminal and the upper end surface of the second electrically conductive terminal are each designed as a flat surface.

[0013] Preferably, the second electrically conductive terminal is provided with a protrusion projecting towards the insulating housing around the outer circumference of the vertical axis, the protrusion having a first engagement surface extending obliquely downwards from the upper end surface of the second electrically conductive terminal towards the insulating housing and a second engagement surface extending from the first engagement surface towards the second electrically conductive terminal to the outer circumferential surface of the second electrically conductive terminal around the vertical axis.

[0014] Preferably, the vertical dimension of the electrically conductive core body is designed to be 440 mm.

[0015] Preferably, the vertical distance between the lower end of the first electrically conductive terminal and the second engagement surface of the second electrically conductive terminal is designed to be 440 mm in the natural state of the first mounting section.

[0016] Preferably, the vertical distance between the lower end of the first electrically conductive terminal and the lower end of the second mounting section is 470 mm in the natural state of the first mounting section and the maximum vertical distance that can be reached between the lower end of the first electrically conductive terminal and the lower end of the second mounting section is 520 mm in the stretched state of the first mounting section.

[0017] According to another aspect of the present application, a switchgear is also provided, which comprises the surge arrester according to the new assembly design.

[0018] Some of the other features and advantages of the present application will become apparent to those skilled in the art from a reading of the detailed description that follows, in conjunction with the attached drawings and appended claims. BRIEF DESCRIPTION OF DRAWINGS

[0019] The embodiments of the present application will be described in detail below with reference to the drawings, in which:

[0020] Figure 1 is a sectional view of a surge arrester according to an embodiment of the present application in a natural state;

[0021] Figure 2 is an exploded view of a surge arrester according to an embodiment of the present application in a natural state;

[0022] Figure 3 is a sectional view according to the sectional line A-A in Figure 2

[0023] BRIEF DESCRIPTION OF DRAWINGS

[0024] ​10 - surge arrester; 11 - insulating housing; 111 - transverse housing; 112 - vertical housing; 113 - mounting cavity; 113a - first mounting section; 113b - second mounting section; 114 - recess; 12 - first conductive terminal; 13 - second conductive terminal; 131 - protrusion; 131a - first engagement surface; 131b - second engagement surface; 14 - conductive core; 15 - tab. DETAILED DESCRIPTION

[0025] With reference to the drawings, a schematic solution of the surge arrester with novel assembly design disclosed by the present application is described in detail. Although the drawings are provided to present some embodiments of the present application, the drawings are not necessarily drawn to scale according to the specific embodiments, and some features can be enlarged, removed or partially cut to better show and explain the disclosure of the present application. Some components in the drawings can be adjusted in position according to actual needs without affecting the technical effects. The phrase "in the drawings" or similar language appearing in the specification does not necessarily refer to all drawings or examples.

[0026] In the following, some directional terms used to describe the drawings, such as "inner", "outer", "upper", "lower" and other directional terms, will be understood to have their normal meanings and refer to those directions involved when normally viewing the drawings. Unless otherwise specified, the directional terms described in the specification are basically according to the conventional directions as understood by those skilled in the art.

[0027] The terms "first", "the first", "second", "the second" and similar terms used in the present application do not represent any order, quantity or importance in the present application, but are used to distinguish one component from other components.

[0028] The terms "engagement", "connection" and similar terms used in the present application include not only the indirect connection of two components by means of an intermediate layer such as an adhesive, a welding agent, etc. or an intermediate piece such as a connector, a transition piece, etc., but also the direct connection of two components without the aid of any intermediate layer such as an adhesive, a welding agent, etc. or an intermediate piece such as a connector, a transition piece, etc.

[0029] Figures 1 to 3 A surge arrester 10 of the present application is shown by way of example, which is not only easy to assemble and compact in structure, but also the high-temperature and high-pressure gas generated inside the surge arrester 10 can be directed to spray out when the main body part of the switchgear is subjected to an accidental high-voltage impact. Understandably, "vertical" herein refers to the up-down direction of the page on which the drawing is located, and "transverse" refers to the left-right direction of the page on which the drawing is located. Figure 1

[0030] As Figures 1 to 3 ​As shown, the lightning arrester 10 can include an insulating housing 11, a first conductive terminal 12, a second conductive terminal 13 and a conductive core 14.

[0031] In particular, the insulating housing 11 can be injection molded from an insulating material and include a transverse housing 111 and a vertical housing 112 extending vertically downward from a substantially middle portion of the transverse housing 111. The transverse housing 111 can be provided with openings at its transverse ends to be connected to a main body portion of a switchgear via adapted connectors. The vertical housing 112 can be provided with a mounting cavity 113 extending vertically to communicate with an external environment, in which the conductive components such as the first conductive terminal 12, the conductive core 14 and the second conductive terminal 13 can be arranged in a vertical direction to avoid as much as possible the impact on the main body portion of the switchgear when subjected to an unexpected high voltage surge.

[0032] The mounting cavity 113 of the vertical housing 112 can include a first mounting section 113a adjacent to the transverse housing 111 and a second mounting section 113b located below the first mounting section 113a and communicating with the external environment. At least the portion of the vertical housing 112 of the insulating housing 11 enclosing the first mounting section 113a is made of an elastic material, which allows the vertical housing 112 of the insulating housing 11 to have different vertical dimensions in a natural state and various stretched states. Preferably, the insulating housing 11 can be integrally made of an elastic insulating material such as rubber.

[0033] The first conductive terminal 12 can be embedded in the interior of the transverse housing 111 and extend vertically within the transverse housing 111 until the lower end of the first conductive terminal 12 extends to the upper portion of the first mounting section 113a. Exemplarily, the first conductive terminal 12 can be pre-embedded in the transverse housing 111 to improve the production efficiency and simplify the subsequent assembly steps of the lightning arrester 10, and to improve the sealing of the upper side of the first mounting section 113a of the vertical housing 112. In an embodiment not shown, the lower end of the first conductive terminal 12 can also extend to the same level as the upper end of the first mounting section 113a, i.e. the lower end of the first conductive terminal 12 is configured to be able to maintain sufficient contact area with the conductive core 14.

[0034] The conductive core 14 can be configured as a plurality of vertically stacked non-linear resistance sheets, such as zinc oxide resistance sheets, so as to exhibit a high resistance state under normal operating voltage and a low resistance state under high voltage. The conductive core 14 is generally configured as an elongated structure and arranged to extend vertically, whereby the elasticity of the first mounting section 113a of the insulating housing 11 is utilized to mount the conductive core 14 between the first conductive terminal 12 and the second conductive terminal 13 and form a reliable electrical connection between the first conductive terminal 12, the conductive core 14 and the second conductive terminal 13.

[0035] The second conductive terminal 13 can be detachably mounted in the second mounting section 113b of the vertical housing 112 and tightly engaged with the vertical housing 112, and when the second conductive terminal 13 is mounted to the second mounting section 113b of the vertical housing 112, the lower end of the second conductive terminal 13 extends to be flush with the upper end of the second mounting section 113b. In an embodiment not shown, the upper end of the second conductive terminal 13 can also be configured to extend upward to the lower part of the second mounting section 113b.

[0036] Therefore, when the lightning arrester 10 in the present application needs to be assembled, the second conductive terminal 13 is in a disengaged state with the insulating shell 11, and by means of an external tool, the first mounting section 113a of the insulating shell 11 can be stretched from a natural state to a stretched state, and then the conductive core 14 is inserted into the first mounting section 113a of the insulating shell 11 from the lower side opening of the insulating shell 11 in communication with the external environment until it contacts the lower end of the first conductive terminal 12. Subsequently, the second conductive terminal 13 can be mounted into the second mounting section 113b of the insulating shell 11, and the external tool is removed from the insulating shell 11 to complete the assembly of the lightning arrester 10 in the present application.

[0037] Since the vertical distance between the lower end of the first conductive terminal 12 and the upper end of the second conductive terminal 13 in the first mounting section 113a in the natural state is less than the vertical dimension of the conductive core 14, the first mounting section 113a of the insulating shell 11 of the assembled lightning arrester 10 is always in a stretched state to clamp the conductive core 14 between the lower end of the first conductive terminal 12 and the upper end of the second conductive terminal 13, so that the lower end of the first conductive terminal 12 and the upper end of the conductive core 14 and the lower end of the conductive core 14 and the upper end of the second conductive terminal 13 maintain tight contact, thereby forming a discharge path from the first conductive terminal 12, the conductive core 14 and the second conductive terminal 13. Optionally, the lower end surface of the first conductive terminal 12, the upper end surface and the lower end surface of the conductive core 14, and the upper end surface of the second conductive terminal 13 can all be designed as flat surfaces.

[0038] When the lightning arrester 10 in the present application encounters an accidental high-voltage impact, the engagement between the second conductive terminal 13 and the insulating shell 11 can fail under the impact of the generated high-temperature and high-pressure gas, so that the second conductive terminal 13 and the corresponding conductive core 14 and high-temperature and high-pressure gas can be released from the lower side opening of the insulating shell 11, thereby ensuring the safety of the lightning arrester 10.

[0039] Optionally, in the illustrated embodiment, the surge arrester 10 can further comprise lugs 15 arranged on the outer periphery of the insulating housing 11 to allow external tools to be connected to the lugs 15 to stretch the insulating housing 11. Thus, the lugs 15 can be arranged on the lower part of the outer periphery of the portion of the insulating housing 11 which encloses the first mounting section 113a, so that the external tools can act on the lower part of the first mounting section 113a of the insulating housing 11 via the lugs 15, so that the first mounting section 113a of the insulating housing 11 can be transformed from the natural state to the stretched state.

[0040] Optionally, in the illustrated embodiment, the second electrically conductive terminal 13 can be accommodated within the second mounting section 113b of the insulating housing 11 and arranged spaced apart from the lower end of the second mounting section 113b, so that a space is left between the second electrically conductive terminal 13 and the lower end of the insulating housing 11 to allow a ground bolt to be connected to a ground line in the space, thereby grounding the main body portion of the switchgear via the first electrically conductive terminal 12, the electrically conductive core 14, the second electrically conductive terminal 13, the ground bolt and the ground line, so as to direct the high voltage current experienced under an unexpected high voltage impact to the ground.

[0041] Optionally, in the illustrated embodiment, the second electrically conductive terminal 13 can be engaged with the portion of the insulating housing 11 enclosing the second mounting section 113b by a form fit, which can simplify the mounting between the second electrically conductive terminal 13 and the insulating housing 11. As shown, the second electrically conductive terminal 13 can be designed in a cylindrical shape, and a radially protruding protrusion 131 can be provided on the outer periphery thereof, and correspondingly, the portion of the insulating housing 11 opposite to the protrusion 131 of the second electrically conductive terminal 13 can be concavely formed in a shape-adapted recess 114, so that a form fit connection is formed between the second electrically conductive terminal 13 and the insulating housing 11.

[0042] Illustratively, the portion of the insulating housing 11 enclosing the second mounting section 113b is also made of a resilient material, and the second electrically conductive terminal 13 is made of a material with higher hardness than the material of the insulating housing 11, such as metal, so that when the second electrically conductive terminal 13 is put into the second mounting section 113b, the insulating housing 11 is pressed radially outward and naturally forms the recess 114 adapted to the protrusion in the process of returning to the original shape. In particular, the recess 114 on the insulating housing 11 formed in this way can enhance the compression degree between the insulating housing 11 and the second electrically conductive terminal 13, thereby improving the connection strength therebetween.

[0043] Optionally, in the illustrated embodiment, the protrusion 131 of the second conductive terminal 13 can be formed by a first joint surface 131a and a second joint surface 131b. Specifically, the first joint surface 131a can extend radially outward and downward from the upper end surface of the second conductive terminal 13, and the second joint surface 131b can extend radially inward from the lower side of the first joint surface 131a to the outer periphery of the second conductive terminal 13, whereby the protrusion 131 of the second conductive terminal 13 is configured in a barb shape, the first joint surface 131a is used to guide the second conductive terminal 13 into the recessed portion 114, and the second contact surface is configured as a flat surface perpendicular to the vertical direction to provide a pressing force opposite to the impact force of the high-temperature and high-pressure gas in the first mounting section 113a of the insulating housing.

[0044] In particular, the extension length of the second joint surface 131b from the second conductive terminal 13 can have a positive correlation with the impact force of the high-temperature and high-pressure gas in the first mounting section 113a, and in particular, a positive correlation with the specification of the predetermined high-voltage current, so that when the conductive core 14 in the first mounting section 113a passes through the high-voltage current, the high-temperature and high-pressure gas generated in the first mounting section 113a can just disengage the second conductive terminal 13 from the insulating housing 11 to eject the second conductive terminal 13 downward, and the high-temperature and high-pressure gas and the conductive core 14 in pressure contact with the first conductive terminal 12 can also be ejected downward, and further ejected downward under the action of gravity, in the process, avoiding the high-temperature and high-pressure gas in the first mounting section 113a impacting the insulating housing 11 in the transverse direction, which can cause the insulating housing 11 to burst.

[0045] Optionally, in the illustrated embodiment, in particular with reference to Figure 3 As shown, the vertical dimension of the conductive core 14 can be designed to be 440 millimeters, with an error of 2 millimeters. The vertical spacing between the lower end surface of the first conductive terminal 12 and the upper end surface of the second conductive terminal 13 is less than 440 millimeters when the first mounting section 113a is in a natural state, and preferably, the vertical spacing between the lower end surface of the first conductive terminal 12 and the second joint surface 131b of the second conductive terminal 13 when the first mounting section 113a is in a natural state is equal to the vertical dimension of the conductive core 14, i.e., 440 millimeters, with an error of 5 millimeters.

[0046] Further, when the insulating shell 11 is made of elastic material as a whole, the vertical distance between the lower end surface of the first conductive terminal 12 and the lower side of the second mounting section 113b is greater than the sum of the vertical dimensions of the conductive core 14 and the second conductive terminal 13 when the insulating shell 11 is in the natural state, for example, the vertical distance between the lower end surface of the first conductive terminal 12 and the lower side of the second mounting section 113b is 470 mm when the insulating shell 11 is in the natural state, wherein the error is within the range of 10 mm; the vertical dimension of the conductive core 14 can be designed to be 440 mm, and the vertical dimension of the second conductive terminal 13 is 27 mm, wherein the error range is within the range of 5 mm. Further, the maximum vertical distance between the lower end surface of the first conductive terminal 12 and the lower side of the second mounting section 113b that can be reached when the insulating shell 11 is in the stretched state is 520 mm, wherein the error range is within the range of 10 mm.

[0047] It should be understood that although the present specification is described in terms of various embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that those skilled in the art can understand.

[0048] The above is only a specific embodiment of the present application, and is not intended to limit the scope of the present application. Any equivalent changes, modifications and combinations made by those skilled in the art without departing from the concept and principles of the present application shall fall within the scope of the present application.

Claims

1. A surge arrester (10) employing a novel assembly design, characterized by, The lightning arrester (10) comprises: an insulating housing (11) having an installation cavity (113) extending vertically to communicate with the outside environment, the installation cavity (113) being vertically divided into a first installation section (113a) and a second installation section (113b) located below the first installation section (113a) and communicating with the outside environment, wherein at least the part of the insulating housing (11) enclosing the first installation section (113a) is made of elastic material to allow the first installation section (113a) to be in a natural state or a stretched state; a first conductive terminal (12) embedded in the interior of the insulating housing (11) and extending vertically above the first installation section (113a), the lower end of the first conductive terminal (12) extending to be flush with the upper end of the first installation section (113a) or extending into the upper part of the first installation section (113a); a second conductive terminal (13) configured to be detachably installed in the second installation section (113b) of the insulating housing (11), the upper end of the second conductive terminal (13) extending vertically to be flush with the upper end of the second installation section (113b) or extending into the lower part of the first installation section (113a); a conductive core (14) extending vertically in the first installation section (113a) of the insulating housing (11), wherein the vertical dimension of the conductive core (14) is greater than the vertical distance between the lower end of the first conductive terminal (12) and the upper end of the second conductive terminal (13) in the natural state of the first installation section (113a), so that the conductive core (14) can be clamped between the lower end of the first conductive terminal (12) and the upper end of the second conductive terminal (13) against the elastic force of the first installation section (113a) in the stretched state.

2. The surge arrester (10) with a new assembly design according to claim 1, characterized in that, The lightning arrester (10) further comprises a lug (15) arranged at the lower periphery of the part of the insulating housing (11) enclosing the first installation section (113a).

3. The surge arrester (10) with a new assembly design according to claim 1, characterized in that, The second conductive terminal (13) is configured to extend upward to be flush with the upper end of the second installation section (113b) and downward to be spaced from the lower end of the second installation section (113b) without exceeding the second installation section (113b).

4. The surge arrester (10) with a new assembly design according to claim 1, characterized in that, The second conductive terminal (13) is engaged to the second installation section (113b) of the insulating housing (11) in a form-fitting manner.

5. The surge arrester (10) with a new assembly design according to claim 4, characterized in that, The lower end surface of the first conductive terminal (12) and the upper end surface of the second conductive terminal (13) are both designed as flat surfaces.

6. The surge arrester (10) with a new assembly design according to claim 5, characterized in that, The second conductive terminal (13) is provided with a protruding portion (131) protruding toward the insulating housing (11) on the outer periphery of the vertical axis, the protruding portion (131) has a first joint surface (131a) extending downwardly and obliquely from the upper end surface of the second conductive terminal (13) toward the insulating housing (11), and a second joint surface (131b) extending from the first joint surface (131a) toward the outer peripheral surface of the second conductive terminal (13).

7. The surge arrester (10) with a new assembly design according to claim 6, characterized in that, The vertical dimension of the conductive core body (14) is designed to be 440 mm.

8. The surge arrester (10) with a new assembly design according to claim 7, characterized in that, The vertical distance between the lower end of the first conductive terminal (12) and the second joint surface (131b) of the second conductive terminal (13) is designed to be 440 mm when the first mounting section (113a) is in a natural state.

9. The surge arrester (10) with a new assembly design according to claim 7, characterized in that, The vertical distance between the lower end of the first conductive terminal (12) and the lower end of the second mounting section (113b) is 470 mm when the first mounting section (113a) is in a natural state, and the maximum vertical distance that can be reached between the lower end of the first conductive terminal (12) and the lower end of the second mounting section (113b) is 520 mm when the first mounting section (113a) is in a stretched state.

10. A switching device, characterized by The switch device comprises a lightning arrester (10) with a new assembly design according to any one of claims 1 to 9.

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