Description

Technical field

The present invention relates generally the field of electricity, in particular to a lightning arrester.

Background art

At present, when performing a field test of a lightning arrester, some acceptance test items require disconnection of the lightning arrester in order to be performed; in the case of an existing lightning arrester, the lightning arrester needs to be at least partially dismantled in order to be disconnected. Once installation of the lightning arrester is complete, on-site dismantling of the lightning arrester is not only likely to carry the potential risk of product faults, but also increases the user's on-site workload; more importantly, the customer needs to use a separate isolation switch, which will lead to increased construction costs.

An existing lightning arrester uses a separate isolation switch. When the lightning arrester needs to be disconnected to perform an acceptance test, the separate isolation switch is added to control the connection and disconnection of the lightning arrester. The addition of the isolation switch to onsite equipment will inevitably increase construction costs.

Summary of the invention

In view of the above, the present invention proposes a lightning arrester. The lightning arrester comprises: a columnar housing; a first electrically conductive component, the first electrically conductive component being disposed in the interior of the columnar housing and configured to be in communication with the outside of the lightning arrester; a second electrically conductive component, the second electrically conductive component being disposed in the interior of the columnar housing and spaced apart from the first electrically conductive component, the second electrically conductive component being connected to a resistor disk; and a rod-shaped switching component, the rod-shaped switching component being configured to enable the lightning arrester to switch between a connected configuration and a disconnected configuration; one end of the rod-shaped switching component is disposed in the interior of the columnar housing, and another end of the rodshaped switching component is disposed outside the columnar housing; in the connected configuration, the first electrically conductive component and the second electrically conductive component are connected to each other via the rod-shaped switching component; in the disconnected configuration, the first electrically conductive component and the second electrically conductive component are disconnected from each other by the user pulling the other end of the rod-shaped switching component outward so that the rod-shaped switching component disengages from the first electrically conductive component.

Furthermore, the rod-shaped switching component comprises an electrically conductive rod and an operating rod which are connected to each other in an extension direction thereof, wherein the length of the electrically conductive rod is greater than the distance between the first electrically conductive component and the second electrically conductive component, so that in the connected configuration, two ends of the electrically conductive rod are respectively connected to the first electrically conductive component and the second electrically conductive component; and wherein at least part of the operating rod is disposed outside the columnar housing.

Furthermore, the rod-shaped switching component further comprises an insulating rod connected between the electrically conductive rod and the operating rod.

Furthermore, the rod-shaped switching component is configured to be able to reciprocate in the extension direction. Furthermore, the first electrically conductive component is configured to have a first receiving hole extending in the extension direction, for receiving one end of the electrically conductive rod of the rod-shaped switching component, and the second electrically conductive component is configured to have a second penetrating hole extending in the extension direction, such that the rod-shaped switching component reciprocates through the second penetrating hole.

Furthermore, recesses are respectively provided in a hole wall of the first receiving hole and a hole wall at the end of the second penetrating hole that is close to the first electrically conductive component, for receiving contact elements, so that in the connected configuration, the two ends of the electrically conductive rod respectively contact the corresponding contact elements.

Furthermore, the lightning arrester further comprises an operating handle, disposed outside the columnar housing and fixed to the end of the operating rod that is located outside the columnar housing; when the lightning arrester is in the connected configuration, the operating handle is fixed to the columnar housing.

Furthermore, the columnar housing has an end wall in an axial direction thereof, and the rod-shaped switching component extends to the outside of the columnar housing through an end wall penetrating hole provided in the end wall, wherein dust rings fitted round the rod-shaped switching component are respectively fixed in the end wall penetrating hole and on two opposite sides of the end wall, and a bushing and at least one sealing ring fitted round the rod-shaped switching component are fixed in the end wall penetrating hole, the bushing and the at least one sealing ring being located between the two dust rings.

Furthermore, the lightning arrester further comprises an operating box which is disposed outside the columnar housing and fixed to the columnar housing; the operating rod extends to the outside of the operating box through the interior of the operating box, and an operating handle is fixed to the end of the operating rod that is located outside the operating box.

Furthermore, the following are fixed in the interior of the operating box: a guide rod extending in a direction parallel to the extension direction of the rod-shaped switching component, and a slide bearing which is fitted round the guide rod and movable along the guide rod, the slide bearing being fixed to the operating rod in order to move together with the operating rod.

Furthermore, a position sensor is provided in the interior of the operating box, the position sensor being configured to sense, and send to a user, the position of the operating rod.

Through this arrangement, the connection and disconnection of the lightning arrester without dismantling the lightning arrester is achieved by the simple structural design inside the lightning arrester, the voltage tolerance of the lightning arrester after disconnection is ensured, and the sealing effect when the rod-shaped switching component is moving is improved.

Brief description of the drawings

Preferred embodiments of the present invention are described in detail below with reference to the drawings, to give those skilled in the art a clearer understanding of the abovementioned and other features and advantages of the present invention. In the drawings:

Fig. 1 is a sectional view that shows schematically the lightning arrester according to a first embodiment of the present invention.

Fig. 2A is a three-dimensional drawing that shows schematically the first electrically conductive component according to the present invention.

Fig. 2B is a three-dimensional sectional view that shows schematically the first electrically conductive component according to the present invention. Fig. 3A is a three-dimensional drawing that shows schematically the second electrically conductive component according to the present invention.

Fig. 3B is a three-dimensional sectional view that shows schematically the second electrically conductive component according to the present invention.

Fig. 4A is a view that shows schematically the rod-shaped switching component according to the present invention.

Fig. 4B is a three-dimensional sectional view that shows schematically part of the rod-shaped switching component in Fig. 4A when the lightning arrester is in the connected configuration .

Figs. 5A and 5B are a side view and a sectional view, respectively, which show schematically the contact element according to the present invention.

Fig. 6 is a partial three-dimensional sectional view that shows schematically the lightning arrester according to the first embodiment of the present invention.

Fig. 7 is a three-dimensional drawing that shows schematically the end wall of the lightning arrester according to the present invention.

Fig. 8 is an enlarged drawing that shows schematically part A in Fig. 1.

Fig. 9 is a sectional view that shows schematically the lightning arrester according to a second embodiment of the present invention; and

Fig. 10 is a sectional view that shows schematically the operating box of the lightning arrester in Fig. 9.

The reference labels are as follows:

100, 200 lightning arrester

I columnar housing

10 side cover

II end wall

III end wall penetrating hole

112 dust ring

113 bushing 114 sealing ring

2 first electrically conductive component

21 first receiving hole

3 second electrically conductive component

31 second penetrating hole

4 resistor disk

5 rod-shaped switching component

51 electrically conductive rod

52 insulating rod

53 operating rod

6 contact element

7 operating handle

8 screw

9 operating box

91 guide rod

92 slide bearing

93 position sensor

X axial direction

Y extension direction

Detailed description of the invention

The present invention is described in further detail below through embodiments, to clarify the objective, technical solution and advantages thereof.

A lightning arrester 100 according to a first embodiment of the present invention is described below. As shown in Fig. 1, the lightning arrester 100 generally comprises a columnar housing 1, a first electrically conductive component 2, a second electrically conductive component 3 and a rod-shaped switching component 5. The first electrically conductive component 2 is disposed in the interior of the columnar housing 1 and configured to be in communication with the outside of the lightning arrester 100. The second electrically conductive component 3 is disposed in the interior of the columnar housing 1 and spaced apart from the first electrically conductive component 2, e.g. spaced apart from the first electrically conductive component 2 in the axial direction X of the columnar housing 1. The second electrically conductive component 3 is connected to a resistor disk 4, the resistor disk 4 likewise being disposed in the interior of the columnar housing 1 of the lightning arrester 100. The rod-shaped switching component 5 is configured to enable the lightning arrester 100 to switch between a connected configuration and a disconnected configuration.

As shown in Fig. 1, one end of the rod-shaped switching component 5 is disposed in the interior of the columnar housing 1, and the other end of the rod-shaped switching component 5 is disposed outside the columnar housing 1, for a user to operate. In the connected configuration, the first electrically conductive component 2 and second electrically conductive component 3 are connected to each other via the rod-shaped switching component 5. In the disconnected configuration, the first electrically conductive component 2 and second electrically conductive component 3 are disconnected from each other by the user pulling the other end of the rod-shaped switching component 5 outward so that the rod-shaped switching component 5 disengages from the first electrically conductive component 2. Thus, switching of the lightning arrester 100 between the connected configuration and the disconnected configuration can be achieved by the user operating (e.g. manually operating) the other end of the rod-shaped switching component 5 so that the rod-shaped switching component 5 reciprocates .

Preferably, as shown in Figs. 1 and 4A, the rod-shaped switching component 5 may comprise an electrically conductive rod 51 and an operating rod 53 which are connected to each other in the extension direction Y thereof. The electrically conductive rod 51 may be made of an electrically conductive material such as metal, while the operating rod 53 may be made of an insulating material. Preferably, the rod-shaped switching component 5 may further comprise an insulating rod 52 connected between the electrically conductive rod 51 and the operating rod 53, as shown in Figs. 1 and 4A. The insulating rod 52 may be made of an insulating material. The electrically conductive rod

51 and operating rod 53 may be plugged together. For example, as shown in Fig. 4B, if the insulating rod 52 is present, the electrically conductive rod 51 and insulating rod 52 may be plugged together, and similarly, the insulating rod 52 and operating rod 53 may also be connected to each other in a similar manner. However, the manner in which the electrically conductive rod 51 and operating rod 53 (and the insulating rod 52 if present) are connected is not limited to this; they may even be integrally formed. As shown in Fig. 4A, one end of the rodshaped switching component 5 is a free end of the electrically conductive rod 51, and the other end of the rod-shaped switching component 5 is a free end of the operating rod 53.

As shown in Fig. 1, the length of the electrically conductive rod 51 is greater than the distance between the first electrically conductive component 2 and the second electrically conductive component 3, so that in the connected configuration, the two ends of the electrically conductive rod 51 are respectively connected to the first electrically conductive component 2 and the second electrically conductive component 3. Thus, when the lightning arrester 100 is in the connected configuration, the first electrically conductive component 2 and a component connected thereto and the second electrically conductive component 3 and a component connected thereto are in communication via the electrically conductive rod 51.

As shown in Figs. 1 and 4A, if the insulating rod 52 is present, the electrically conductive rod 51 and insulating rod

52 may be disposed in the interior of the columnar housing 1, at least part of the operating rod 53 is disposed outside the columnar housing 1 so as to be operated by the user, and the remainder of the operating rod 53 is disposed in the interior of the columnar housing 1.

In particular, as shown in Fig. 1, the rod-shaped switching component 5 may be configured to be able to reciprocate in the extension direction Y thereof, as a result of the user operating the other end of the operating rod 53, such that the free end of the electrically conductive rod 51 connects with or disengages from the first electrically conductive component 2, thereby connecting or disconnecting the lightning arrester 100.

Figs. 2A and 2B show details of the first electrically conductive component 2, wherein the first electrically conductive component 2 is configured to have a first receiving hole 21 extending in the extension direction Y of the rod-shaped switching component 5, for receiving one end, i.e. the free end, of the electrically conductive rod 51 of the rod-shaped switching component 5. The second electrically conductive component 3 is configured to have a second penetrating hole 31 extending in the extension direction Y of the rod-shaped switching component 5, such that the rod-shaped switching component 5 reciprocates through the second penetrating hole 31. When one end of the electrically conductive rod 51 is received in the first receiving hole 21 of the first electrically conductive component 2, one end of the electrically conductive rod 51 is in communication with the first electrically conductive component 2, and at the same time the other end of the electrically conductive rod 51 is in communication with the second electrically conductive component 3. Thus, the first electrically conductive component 2 and second electrically conductive component 3 can be connected to each other using the electrically conductive rod 51.

As shown in Figs. 2B and 3B, recesses are respectively provided in a hole wall of the first receiving hole 21 and a hole wall at the end of the second penetrating hole 31 that is close to the first electrically conductive component 2, for receiving contact elements 6 as shown in Figs. 5A and 5B, so that in the connected configuration, the two ends of the electrically conductive rod 51 respectively contact the corresponding contact elements 6, and are in communication with the first electrically conductive component 2 and the second electrically conductive component 3 via the contact elements 6.

As shown in Figs. 1 and 6, the lightning arrester 100 may further comprise an operating handle 7, disposed outside the columnar housing 1 and fixed to the end of the operating rod 53 that is located outside the columnar housing 1 (i.e. the free end of the operating rod 53), for the user to operate. When the lightning arrester 100 is in the connected configuration, the operating handle 7 is fixed to the columnar housing 1, e.g. fastened to the columnar housing 1 by screws 8, thereby making the connected configuration stable to prevent accidental disconnection of the lightning arrester 100.

As shown in Figs. 1, 7 and 8, the columnar housing 1 has an end wall 11 in the axial direction X thereof. The end wall 11 may be part of the columnar housing 1, but is not limited to this. For example, the columnar housing 1 is open at the end where the end wall is located, and closed by an independent end cap; thus, the end wall 11 may also be an independent end cap.

The rod-shaped switching component 5 may extend to the outside of the columnar housing 1 through an end wall penetrating hole 111 provided in the end wall 11. As shown in Fig. 8, dust rings 112 fitted round the rod-shaped switching component 5 may be respectively fixed in the end wall penetrating hole 111 and on two opposite sides of the end wall 11, and a bushing 113 and at least one sealing ring 114 fitted round the rod-shaped switching component 5 may be fixed in the end wall penetrating hole 111, the bushing 113 and at least one sealing ring 114 being located between the two dust rings 112. This arrangement enables good sealing to be achieved between the inside and outside of the lightning arrester 100 when the rod-shaped switching component 5 reciprocates. Moreover, the presence of the bushing 113 can also guide the reciprocation of the rodshaped switching component 5 in the extension direction Y thereof, to prevent deviation thereof.

A lightning arrester 200 according to a second embodiment of the present invention is described below. The structure of the lightning arrester 200 is essentially the same as the structure of the lightning arrester 100, the difference being that, as shown in Figs. 9 and 10, the lightning arrester 200 further comprises an operating box 9 which is disposed outside the columnar housing 1 and fixed to the columnar housing 1. The operating rod 53 extends to the outside of the operating box 9 through the interior of the operating box 9, and an operating handle 7 is fixed to the end of the operating rod 53 that is located outside the operating box 9, for the user to operate.

As shown in Figs. 9 and 10, the following may be fixed in the interior of the operating box 9: a guide rod 91 extending in a direction parallel to the extension direction Y of the rodshaped switching component 5, and a slide bearing 92 which is fitted round the guide rod 91 and movable along the guide rod 91. The slide bearing 92 is fixed to the operating rod 53 in order to move together with the operating rod 53. This arrangement also makes it possible to guide the reciprocation of the rod-shaped switching component 5, to prevent deviation thereof. In addition, a position sensor 93 may also be provided in the interior of the operating box 9. The position sensor 93 is configured to sense, and send to the user, the position of the operating rod 53, so that the user knows clearly which configuration the lightning arrester 200 is in.

Using the lightning arrester provided in the present invention, the connection and disconnection of the lightning arrester is achieved by the simple structural design inside the lightning arrester, without the need to dismantle the lightning arrester (e.g. by opening a side cover 10 to manually connect or disconnect the lightning arrester) and without the need to use an additional isolation switch.

The above are merely preferred embodiments of the present invention, which are not intended to limit it. Any amendments, equivalent substitutions or improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.