Solid-sealed polar pole, circuit breaker and ring main unit

Abstract

The utility model provides a solid-sealed polar pole, a breaker and a ring main unit, the solid-sealed polar pole comprises a polar pole body, a moving end shielding seat and a static end shielding seat, the moving end shielding seat is formed by casting metal, the outer surface of the metal is covered with an insulating resin layer, the static end shielding seat is formed by casting metal, and the outer surface of the metal is covered with an insulating resin layer. And the insulating resin layers of the pole body, the moving end shielding seat and the static end shielding seat are integrally poured to form a whole. Therefore, the insulating resin covers the outer surfaces of the polar column body, the moving end shielding seat and the static end shielding seat together, and the insulating resin is used as an insulating material, so that the polar column body, the moving end shielding seat and the static end shielding seat can be tightly combined together in an integrated pouring manner, and the connecting parts of all the components are wrapped by the insulating material; in addition, an extra insulating layer is provided, and electrical isolation is carried out on the whole solid-sealed polar pole, so that the insulating strength of the whole solid-sealed polar pole is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of ring network cabinets, and mainly to a sealed pole, a circuit breaker and a ring network cabinet. Background Art

[0002] In switch cabinets, SF6 gas insulation is usually used for the disconnection of switchgear due to its good insulation and arc extinguishing properties. However, as a greenhouse gas, the use of SF6 is not conducive to environmental development. In the prior art, there is also the use of dry air, which is more economical and environmentally friendly, as an insulating gas, but this often requires the switchgear to have a larger insulating space, which makes the prepared switchgear larger in size. For small-sized switchgears, especially medium and high voltage switchgears, due to space limitations, switchgear using air as the insulating gas is still difficult to meet the insulation requirements of the switchgear. Summary of the invention

[0003] In order to solve the problem that the switch equipment of the small-sized medium and high voltage switchgear designed using air as the insulating gas in the current related technology does not meet the insulation requirements, a sealed pole, a circuit breaker and a ring network are provided.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] In one aspect, the present application discloses a sealed pole, comprising:

[0006] A pole body, comprising a vacuum interrupter and an insulating resin layer wrapping the vacuum interrupter;

[0007] The moving end shielding seat is formed by metal casting and the outer surface of the metal is covered with an insulating resin layer;

[0008] The static end shielding seat is formed by metal casting and the outer surface of the metal is covered with an insulating resin layer;

[0009] The insulating resin layers of the pole body, the moving end shielding seat and the static end shielding seat are integrally cast to form a whole.

[0010] Optionally, the moving end shielding seat is located at the first end of the pole body, and the moving end shielding seat includes a first connecting plate and three first shielding plates extending upward from the first connecting plate, and the first connecting plate and the first shielding plate together enclose a first shielding cavity, and the first end of the vacuum arc extinguishing chamber is located in the first shielding cavity, and is used to connect with the operating mechanism in the first shielding cavity, wherein the outer surface of the first shielding cavity enclosed by the first connecting plate and the first shielding plate is covered by the insulating resin, and the inner surface of the first shielding cavity is a metal surface.

[0011] Optionally, the static end shielding seat is located at the second end of the pole body, and the static end shielding seat includes a second connecting plate and two second shielding plates extending downward from the second connecting plate, the second shielding plates are relatively arranged on opposite sides of the second connecting plate, the second connecting plate and the second shielding plate are enclosed to form a second shielding cavity, the connection between the second end of the vacuum arc chamber and the conductive part is located in the second shielding cavity, the inner surface and the outer surface of the second shielding plate are covered by the insulating resin, and the inner surface of the second shielding cavity formed by the second connecting plate is a metal surface.

[0012] Optionally, the first connecting plate is connected to the first end of the pole body by pouring the insulating resin;

[0013] The first connecting plate is arranged toward the first end, and is provided with a through hole connected to the vacuum arc extinguishing chamber. The first end of the pole body is provided with a movable end for connecting to an operating mechanism, and the movable end extends into the interior of the vacuum arc extinguishing chamber through the through hole and can move up and down in the through hole.

[0014] Optionally, the second connecting plate is arranged toward the second end of the vacuum arc extinguishing chamber, and a first connecting hole is provided on the second connecting plate, and the first connecting hole is used for a connecting member to pass through to lock the second connecting plate and the second end.

[0015] Optionally, the pole body includes a cylinder forming the vacuum arc extinguishing chamber, a silicone sleeve wrapping the outer surface of the cylinder, and the insulating resin layer wrapping the outer surface of the silicone sleeve.

[0016] Optionally, a boss is protruded from the first connecting plate of the moving end shielding seat toward the vacuum arc extinguishing chamber, and the boss is in contact with the top surface of the silicone sleeve.

[0017] Optionally, the surface of the pole body is provided with a first insulating plate protruding from the surface, the first insulating plate is integrally connected to the pole body by casting the insulating resin, the first insulating plate is located on a side of the pole body used for connecting to the operating mechanism, and the first insulating plate is arranged between the moving end shielding seat and the static end shielding seat.

[0018] Optionally, the pole body also includes a second insulating plate and a third insulating plate, the second insulating plate and the third insulating plate are both located on the side of the pole body away from the first insulating plate, the second insulating plate is correspondingly arranged on the end where the moving end shielding seat is located, the third insulating plate is correspondingly arranged on the end of the static end shielding seat, and the second insulating plate and the third insulating plate are both cast and connected to the pole body as a whole through the insulating resin.

[0019] Optionally, a fixing insert is further provided on the pole body, and the fixing insert is used to fix the pole body, and the pole body and the fixing insert are connected as one body by pouring the insulating resin.

[0020] Optionally, the number of the fixing inserts is three, and the positions of the three fixing inserts constitute three vertices of a triangle.

[0021] The second aspect of the present application discloses a circuit breaker, comprising at least one sealed pole and an operating mechanism as described in any of the above embodiments, wherein a moving conductive rod connected to the operating mechanism is installed at the first end of the sealed pole, and the moving conductive rod is located in a cavity surrounded by a moving end shielding seat of the sealed pole, and the operating mechanism can drive the moving conductive rod to move, and a static conductive rod cooperating with the moving conductive rod to realize the connection or disconnection of the circuit breaker is installed at the second end of the sealed pole.

[0022] The third aspect of the present application discloses a ring main unit, comprising a cabinet body and a circuit breaker as described above, which is arranged in the cabinet body.

[0023] The technical solution provided by the embodiments disclosed in this application may have the following beneficial effects:

[0024] The present application discloses a solid-sealed pole, a circuit breaker and a ring network cabinet. The solid-sealed pole includes a pole body, a moving end shielding seat and a static end shielding seat. The moving end shielding seat and the static end shielding seat can respectively cover the two ends of the pole body, so as to better electrically isolate the electrical connection of the pole body from the external environment, and can play a role in uniform electric field. Moreover, the pole body, the moving end shielding seat and the static end shielding seat are integrally cast by insulating resin to form a whole. In this way, the insulating resin covers the outer surface of the three together. The insulating resin, as an insulating material, can not only tightly combine the pole body, the moving end shielding seat and the static end shielding seat by integral casting, but also make the connection between each component covered by insulating material, which can provide a good electrical isolation effect for the whole solid-sealed pole, thereby reducing the risk of arc and breakdown caused by a higher voltage difference when the solid-sealed pole is used in the switchgear, and can play a role in uniform electric field for the solid-sealed pole, and improve the insulation strength of the whole solid-sealed pole. Since the circuit breaker pole is a key structure in the switch cabinet that carries out the task of current transmission and distribution, by using the sealed pole provided by the present application, the insulation performance of the ring network cabinet can be more effectively improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A cross-sectional view of a sealed pole according to an embodiment of the present application;

[0026] Figure 2 for Figure 1 A local enlarged view of the A;

[0027] Figure 3 This is one of the three-dimensional views of a sealed pole according to an embodiment of the present application;

[0028] Figure 4 This is a second three-dimensional diagram of a sealed pole according to an embodiment of the present application;

[0029] Figure 5 The third stereogram of the sealed pole according to an embodiment of the present application;

[0030] Figure 6 This is a fourth three-dimensional diagram of a sealed pole according to an embodiment of the present application;

[0031] Figure 7 This is one of the three-dimensional views of the moving end shielding seat of one embodiment of the present application;

[0032] Figure 8 This is a second three-dimensional diagram of a moving end shielding seat according to an embodiment of the present application;

[0033] Fig. 9 This is one of the three-dimensional views of the static end shielding seat of one embodiment of the present application;

[0034] Fig.10 This is a second three-dimensional diagram of the static end shielding seat of an embodiment of the present application;

[0035] The corresponding relationship between the reference numerals and the component names is as follows:

[0036] 1 pole body, 11 vacuum interrupter, 12 insulating resin layer;

[0037] 2 moving end shielding seat, 201 first shielding cavity, 202 through hole, 203 second connecting hole, 21 first connecting plate, 22 first shielding plate, 23 boss;

[0038] 3 static end shielding seat, 301 second shielding cavity, 302 first connecting hole, 31 second connecting plate, 32 second shielding plate;

[0039] 4. Silicone sleeve;

[0040] 5 first insulating plate;

[0041] 6 second insulating plate;

[0042] 7 third insulating plate;

[0043] 8 fixed insert, 801 third connecting hole. DETAILED DESCRIPTION

[0044] The present invention provides a sealed pole, a circuit breaker and a ring main unit. To make the purpose, technical solution and effect of the present invention clearer and more specific, the present invention is further described in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the scope of protection of the present invention.

[0045] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying 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 a limitation on the present invention.

[0046] 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, an electrical connection, or mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] In order to improve the reliability of power supply and enable users to obtain power from two directions, the power supply network is usually connected into a ring, that is, a ring network power supply system, and this power supply method is referred to as ring power supply. The high-voltage switchgear used in the ring network power supply system is generally called a ring network cabinet.

[0048] Traditional ring main units usually use SF6 gas insulation. SF6 gas has good insulation and arc extinguishing performance, but it is a strong greenhouse gas and is not conducive to environmental protection. Based on this, the existing ring main unit uses air insulation, which is more in line with the development concept of green environmental protection.

[0049] Those skilled in the art will understand that the smaller the volume of the ring main unit, the weaker the insulation performance. In particular, in the process of miniaturizing the ring main unit that uses dry air as the insulating gas, it is necessary to take into account the insulation performance of the cabinet while reducing the cabinet volume.

[0050] Therefore, for small-sized ring main units, especially medium and high voltage ring main unit designs, it is necessary to further improve the insulation performance inside the cabinet. Among them, since the circuit breaker pole is a key structure in the switch cabinet that carries the task of current transmission and distribution, if the insulation performance of the pole is poor, it may lead to excessive electric field strength, thereby causing partial discharge or breakdown. This application improves the insulation performance of the ring main unit by optimizing the electric field design of the circuit breaker pole.

[0051] The present application discloses a ring main unit, in which a circuit breaker is arranged in a cabinet body. The circuit breaker comprises a sealed pole and an operating mechanism. The operating mechanism realizes connection and disconnection coordination between a static conductive rod and a dynamic conductive rod of the sealed pole through action.

[0052] As attached Figure 1 To Attachment Fig.10 As shown, the sealed pole has a first end, on which a conductive sleeve is arranged, and an opening is arranged on the conductive sleeve for installing a movable conductive rod connected to the operating mechanism, and the movable conductive rod is located in the movable end shielding seat 2 of the sealed pole. The operating mechanism can be used to drive the movable conductive rod of the sealed pole to move, and a static conductive rod that is connected and disconnected with the movable conductive rod is installed at the second end of the sealed pole. In this way, the movable conductive rod installed at the first end of the sealed pole can be driven to move by the operating mechanism, thereby realizing the on and off functions of the circuit breaker.

[0053] For example, the operating mechanism is a circuit breaker operating mechanism, and the circuit breaker operating mechanism is transmission-connected to the movable conductive rod. The connection structure between the movable conductive rod and the circuit breaker operating mechanism includes but is not limited to a conductive connector that fixes the movable conductive rod to the first end of the sealed pole, a movable end crank arm transmission-connected to the movable conductive rod, and a transmission pin that penetrates the movable end crank arm, etc.

[0054] Please see attached Figure 1 To Attachment Figure 6 The sealed pole includes a pole body 1, a moving end shielding seat 2 and a static end shielding seat 3.

[0055] The pole body includes a vacuum interrupter and an insulating resin layer wrapping the vacuum interrupter; the moving end shielding seat is formed by metal casting and the metal outer surface is covered with an insulating resin layer; the static end shielding seat is formed by metal casting and the metal outer surface is covered with a layer of insulating resin; wherein the insulating resin layers of the pole body, the moving end shielding seat and the static end shielding seat are formed into a whole by integral casting.

[0056] The design of integrally casting the sealed pole makes the contact between the pole body 1, the moving end shielding seat 2 and the static end shielding seat 3 closer. Compared with setting the pole body 1, the moving end shielding seat 2 and the static end shielding seat 3 separately, these components are integrally cast with insulating resin, which can reduce the possible gaps or poor contact between the joints of the components, so that a tight connection can be formed between the three.

[0057] It can be understood that as an insulating material, the insulating resin can not only tightly combine the pole body 1, the moving end shielding seat 2 and the static end shielding seat 3 together by integral casting, but also provide an additional insulating resin layer 12 to provide electrical isolation for the whole composed of the pole body 1, the moving end shielding seat 2 and the static end shielding seat 3, thereby reducing the risk of arcing and breakdown caused by the high voltage difference when the sealed pole is used in the switch equipment, achieving a more effective uniform electric field effect, and improving the insulation performance of the entire sealed pole.

[0058] Optionally, the insulating resin is epoxy resin.

[0059] As attached Figure 1 As shown, the pole body 1 includes a cylinder with a vacuum interrupter 11 formed thereon, a silicone sleeve wrapped around the outer surface of the cylinder, and an insulating resin layer coated on the outer surface of the silicone sleeve.

[0060] Specifically, a vacuum interrupter 11 is formed inside the pole body 1, and the two ends of the vacuum interrupter 11 are the first end and the second end respectively. It can be understood that the first end and the second end of the vacuum interrupter 11 correspond to the first end and the second end of the pole body respectively. The second end of the vacuum interrupter 11 is correspondingly provided with a static end, and the second end of the vacuum interrupter 11 is correspondingly provided with a moving conductive rod, wherein the moving conductive rod provided in the vacuum interrupter 11 is used for transmission connection with the operating mechanism, so as to control the opening and breaking coordination between the moving conductive rod and the static conductive rod.

[0061] When the operating mechanism drives the moving conductive rod of the vacuum interrupter 11 to close, the operating mechanism can drive the moving conductive rod to move toward the static conductive rod to close the moving conductive rod and the static conductive rod, so that the power supply is connected to the load; when the operating mechanism drives the pole body 1 to be in the opening state, the moving conductive rod is separated from the static conductive rod.

[0062] The moving end shielding seat 2 is arranged on the first end of the vacuum interrupter 11 , and the static end shielding seat 3 is arranged on the second end of the vacuum interrupter 11 .

[0063] Among them, a silicone sleeve 4 is nested on the outer surface of the cylinder of the pole body 1, so that the insulating resin covers the silicone sleeve 4. In this way, compared with the problem of directly casting the insulating resin and the vacuum interrupter 11 together, which has the problem of low bonding rate and easy generation of bubbles, the surface of the vacuum interrupter 11 is first coated with a silicone sleeve 4. Since the silicone sleeve 4 has a certain elasticity, it can be tightly connected with the vacuum interrupter 11. At the same time, after the insulating resin is cured and formed on the outer surface of the silicone sleeve, the silicone sleeve 4 can be more closely combined with the insulating resin, so that the vacuum interrupter 11 can be more tightly wrapped by the insulating resin, thereby forming a multi-layer tightly connected integrated structure, which has a better electrical isolation effect.

[0064] It can be understood that since the two ends of the pole body 1 need to be correspondingly provided with a moving end shielding seat 2 and a static end shielding seat 3, the corresponding silicone sleeve nested on the outer surface of the cylinder covers the insulating resin layer, but the silicone sleeves at the corresponding two ends of the cylinder do not need to be covered with insulating resin, so that the moving end shielding seat 2 and the static end shielding seat 3 are respectively connected to the two ends of the cylinder.

[0065] The first end of the pole body 1 is arranged corresponding to the end where the moving conductive rod of the vacuum interrupter 11 is located. A moving end shielding seat 2 is arranged on the first end of the pole body 1, so that the connection between the conductive rod of the vacuum interrupter 11 and the operating mechanism can be installed in the moving end shielding seat 2.

[0066] As attached Figure 2 As shown, the moving end shielding seat 2 is provided with a first shielding cavity 201, and the connection between the first end of the vacuum arc chamber 11 and the operating mechanism is covered by the first shielding cavity 201, which can electrically isolate the first end of the vacuum arc chamber 11 and reduce the influence of the electric field on the electric field of the adjacent phase.

[0067] As attached Figure 7 and attached Figure 8 As shown, specifically, the moving end shielding seat 2 includes a first connecting plate 21 and three first shielding plates 22 extending upward from the first connecting plate 21, and the first connecting plate 21 and the first shielding plate 22 together enclose a first shielding cavity 201. The first end of the vacuum arc extinguishing chamber 11 is located in the first shielding cavity 201 and is used to connect with the operating mechanism in the first shielding cavity 201.

[0068] The first connecting plate 21 and the first shielding plate 22 enclose a first shielding cavity 201 , the outer surface of which is covered with insulating resin, and the inner surface of the first shielding cavity 201 is a metal surface.

[0069] In the process of preparing the sealed pole, the outer surfaces of the first connecting plate 21 and the first shielding plate 22 are covered with insulating resin, which enhances the insulation performance of the moving end shielding seat 2 and is beneficial to the safe operation of the circuit breaker under high voltage.

[0070] The inner surfaces of the first connecting plate 21 and the three first shielding plates 22 enclose a first shielding cavity 201, the inner surface of which is a metal surface, providing sufficient space for the movement of the movable conductive rod and the operating mechanism. The metal surface has good electrical conductivity and electromagnetic shielding effect.

[0071] Moreover, when the insulating resin is cast into an integral structure, the overall design of the moving end shielding seat 2 can provide electrical isolation for the first end of the pole body more effectively, reduce the risk of the electric field of the conductive connection part of the first end of the pole body spreading outward, and reduce the phase-to-phase electric field interference in multi-phase electrical equipment, or other external electromagnetic fields The interference with the moving conductive rod, thereby improving the insulation performance on the moving conductive rod side of the vacuum arc chamber 11.

[0072] In more detail, the first connecting plate 21 and the three first shielding plates 22 are configured as four faces of a hexahedron, and the other two faces are configured as open faces, one of which is open to allow the transmission connection structure connected between the circuit breaker operating mechanism and the moving conductive rod to extend into the first shielding cavity 201.

[0073] Furthermore, a connecting seat is also provided on the moving end shielding seat 2, and the connecting seat is located on one of the open surfaces for the moving conductive rod to extend into, such as Figure 7 As shown, a second connecting hole 203 is provided on the connecting seat, so that the transmission pin passing through the movable end crank arm can be connected to the movable end shielding seat 2 through the second connecting hole 203 .

[0074] Specifically, the opening of the second connection hole 203 faces upward so that the transmission pin can be placed on the connection seat, and the connecting member can fix the transmission pin on the connection seat through the second connection hole 203, thereby forming a rotation fulcrum of the movable end crank arm, so that it is possible to avoid opening a side hole on the pole body to connect the transmission pin, further optimizing the electric field distribution at the connection between the first end of the pole body and the movable conductive rod, thereby improving the insulation level of the first end of the pole body. The first connecting plate 21 is connected to the first end of the vacuum interrupter 11 by pouring insulating resin.

[0075] It is understandable that this connection method between the first connecting plate 21 and the vacuum arc chamber 11 utilizes the excellent insulation performance and bonding strength of the insulating resin. The casting of the insulating resin integrates the connection between the moving end shielding seat 2 and the pole body 1 and improves the connection strength between the two.

[0076] Combined with Figure 1 and attached Figure 8 As shown, the first connecting plate 21 is arranged toward the first end, and the first connecting plate 21 is provided with a through hole 202 connected to the vacuum arc chamber 11, so that the movable conductive rod extends into the vacuum arc chamber 11 through the through hole 202 and can move up and down in the through hole 202.

[0077] In detail, the moving end shielding seat 2 is connected to the vacuum interrupter 11 through a through hole 202 provided on the first connecting plate 21. The through hole 202 can allow the moving conductive rod to pass through. The moving conductive rod can move up and down in the through hole 202 under the drive of the operating mechanism, so that the closing and opening actions between the moving conductive rod and the static conductive rod in the vacuum interrupter 11 can be operated by driving the operating mechanism.

[0078] Combined with Figure 1 and attached Figure 2 As shown, a boss 23 of the first connecting plate 21 of the moving end shielding seat 2 protrudes toward the vacuum interrupter 11 and contacts the top surface of the silicone sleeve 4 .

[0079] As attached Figure 2 As shown, one end of the boss 23 is connected to the first connecting plate 21 of the moving end shielding seat 2, and the other end of the boss 23 extends toward the vacuum interrupter 11 and abuts against the silicone sleeve 4. In this way, in the process of integrally casting the moving end shielding seat 2 and the pole body 1, the boss 23 can more effectively block the insulating resin outside the connection between the first connecting plate 21 and the moving conductive rod of the vacuum interrupter 11, and prevent the epoxy resin from penetrating into the vacuum interrupter through the connection between the moving end shielding seat 2 and the pole body 1 and solidifying, thereby affecting the movement of the conductive rod, thereby reducing the flexibility of the moving conductive rod. The setting of the boss 23 can reduce the problem of affecting the operating performance of the sealed pole due to the solidification of the epoxy resin on the outside of the pole body 1.

[0080] In detail, the boss 23 is arranged on the outer side of the through hole 202 of the first connecting plate 21 to prevent the insulating resin from penetrating into the vacuum arc chamber 11 through the through hole 202 and causing the movement process of the moving conductive rod to be stuck, so that the moving conductive rod in the moving end shielding seat 2 can open and close more smoothly under the control of the operating mechanism.

[0081] like Figure 2 As shown, there are two bosses 23, which can form a better barrier effect on the insulating resin. Of course, the technical solution of the present application does not limit the number of bosses, and the number of bosses 23 can be designed according to actual needs.

[0082] The boss 23 can be formed integrally with the moving end shielding seat 2 by metal casting.

[0083] Combined with Figure 4 and attached Figure 5 As shown, the static end shielding seat 3 is located at the second end of the pole body 1, so that the static end shielding seat 3 can directly cover and protect the static end of the vacuum interrupter 11 and the connection between it and the conductive member.

[0084] As attached Fig. 9 and attached Fig.10 As shown, the static end shielding seat 3 includes a second connecting plate 31 and two second shielding plates 32 extending downward from the second connecting plate 31, the second shielding plates 32 are relatively arranged on opposite sides of the second connecting plate 31, and the second connecting plate 31 and the second shielding plate 32 are enclosed to form a second shielding cavity 301, so that the connection between the static end of the vacuum arc chamber 11 and the conductive part is located in the second shielding cavity 301.

[0085] The conductive parts may include but are not limited to isolating static contacts, connecting parts between the static end shielding seat 3 and the static end of the vacuum interrupter 11, etc.

[0086] By adding the second shielding plates 32 on both sides of the conductive member, a physical barrier can be formed on the second end side of the vacuum arc extinguishing chamber 11 to play a role in electrical isolation.

[0087] Furthermore, the inner surface and the outer surface of the second shielding plate 32 are both covered with insulating resin, and the inner surface of the second shielding cavity 301 formed by the second connecting plate 31 is a metal surface.

[0088] Among them, the inner surfaces of the second shielding plate 32 and the second connecting plate 31 enclose a second shielding cavity 301. In the second shielding cavity 301, since the second connecting plate 31 is used to connect to the second end of the vacuum arc chamber 11 and serve as a conductive surface, the inner surface of the second connecting plate 31 is designed to be a metal surface to facilitate the installation of the static end.

[0089] On the other hand, the inner and outer surfaces of the two second shielding plates 32 are covered with insulating resin, which provides electrical isolation for the second end of the vacuum arc chamber 11, reduces the risk of the electric field of the conductive connection at the second end of the vacuum arc chamber 11 spreading outward, and can also reduce the phase-to-phase electric field interference in multi-phase electrical equipment, or other external electromagnetic fields The interference with the static end of the vacuum arc chamber 11 improves the insulation strength of the static end of the pole body 1.

[0090] In general, the moving end shielding seat 2 is arranged at the first end of the vacuum arc chamber 11, and plays an electric field shielding role for the connection between the moving conductive rod of the vacuum arc chamber 11 and the operating structure. The static end shielding seat 3 is arranged at the second end of the vacuum arc chamber 11, and electrically isolates the connection between the static end of the vacuum arc chamber 11 and the conductive member. In this way, the interphase electric field interference between the moving conductive rod of the pole body 1 and the static end of the pole body 1 can be more effectively reduced in the multi-phase equipment, or the electromagnetic field interference generated by other external equipment, thereby improving the insulation strength of the two ends of the pole body 1. Moreover, the pole body 1, the moving end shielding seat 2 and the static end shielding seat 3 are cast into an integral structure by insulating resin, so that the three can be closely connected, reducing the risk of arcing or electrical breakdown from the connection between the components, thereby improving the insulation strength of the solid-sealed pole as a whole.

[0091] The second connecting plate 31 is disposed toward the second end of the vacuum interrupter 11 . A first connecting hole 302 is disposed on the second connecting plate 31 . The first connecting hole 302 is used for a connecting member to pass through so as to lock the second connecting plate 31 and the second end.

[0092] like Figure 1 As shown, the connecting piece is passed through the first connecting hole 302 and connects the second connecting plate 31 to the static end of the vacuum interrupter 11 .

[0093] For example, the connecting parts may be screws, bolts, etc. made of metal materials, so as to achieve current conduction.

[0094] As attached Figure 1 and Figure 3 As shown, the surface of the pole body 1 is provided with a first insulating plate 5 protruding from the surface, the first insulating plate 5 is cast and connected to the pole body 1 as a whole, the first insulating plate 5 is located on the side of the pole body 1 used for connecting with the operating mechanism, and the first insulating plate 5 is arranged between the moving end shielding seat 2 and the static end shielding seat 3.

[0095] Among them, the first insulating plate 5 protrudes from the surface of the pole body 1, and forms an integrated structure with the pole body 1 through casting of insulating resin, so that the first insulating plate 5 can be more firmly attached to the pole body 1, and the connection between the two is tighter and more reliable, and not easy to fall off or shift.

[0096] Furthermore, the distribution design of the first insulating plate 5 on the pole body 1 is to be located on the side where the pole body 1 is connected to the operating mechanism, and is arranged between the moving end shielding seat 2 and the static end shielding seat 3. Combined with the application scenario of the sealed pole in the switch cabinet, the first insulating plate 5 is located between the high-voltage metal and the grounded metal position, which can increase the creepage distance and improve the creepage level of the sealed pole, thereby reducing the risk of the insulating resin layer on the surface of the pole body 1 being polarized and becoming charged, thereby improving the overall insulation performance of the sealed pole.

[0097] In more detail, two first insulating plates 5 are provided, and the two first insulating plates 5 are arranged opposite to each other, so as to further improve the creepage level and insulation performance of the surface of the sealed pole.

[0098] like Figure 1 , Figure 4 and Figure 5 As shown, the surface of the pole body 1 is further provided with a second insulating plate 6 and a third insulating plate 7, wherein the second insulating plate 6 and the third insulating plate 7 are both located on the side of the pole body 1 away from the first insulating plate 5, the second insulating plate 6 is correspondingly arranged on the end where the moving end shielding seat 2 is located, and the third insulating plate 7 is correspondingly arranged on the end of the static end shielding seat 3, and the second insulating plate 6 and the third insulating plate 7 are both cast and connected to the pole body 1 by insulating resin.

[0099] From the perspective of the overall structure of the sealed pole, the pole body 1 is provided with a first insulating plate 5 on the side connected to the operating mechanism, and a second insulating plate 6 and a third insulating plate 7 are provided on the side away from the side connected to the operating mechanism, which can more comprehensively and effectively increase the creepage distance on the surface of the pole body 1.

[0100] From the position layout of the second insulating plate 6 and the third insulating plate 7, since the moving end shielding seat 2 and the static end shielding seat 3 are the key parts for connecting the pole body 1 with the external circuit, by arranging insulating plates at these two positions, the creepage level of the pole body can be improved, and the insulation strength on the moving end shielding seat 2 and the static end shielding seat 3 side can be more effectively improved.

[0101] As attached Figure 1 As shown, a fixing insert 8 is further provided on the pole body 1 , and the fixing insert 8 is used to be connected with a fixing object to fix the pole body 1 , thereby achieving fixation of the pole body 1 .

[0102] For example, the fixing insert 8 is connected to the cabinet body of the switch cabinet, so that the pole body 1 is fixed on the cabinet body of the switch cabinet.

[0103] The pole body 1 and the fixed insert 8 are connected as one by pouring insulating resin, so that the fixed insert 8 and the pole body 1 are tightly connected as one, avoiding the fixed insert 8 affecting the uniformity of the electric field of the sealed pole, and further improving the overall insulation strength of the sealed pole.

[0104] For more details, please refer to the attached Figure 3 Along the two end directions of the pole body 1, first insulating plates 5 are arranged opposite to each other on both sides of the fixed insert 8. The arrangement of the first insulating plates 5 can further improve the insulation strength of the connection between the fixed insert 8 and the switch cabinet.

[0105] As attached Figure 3 and attached Figure 4 As shown, the fixing insert 8 is columnar as a whole, and its surface is a curved surface. A third connecting hole 801 is formed inside, and the third connecting hole 801 can be passed through by a connecting piece to connect the fixing insert 8 to the cabinet body of the switch cabinet.

[0106] Furthermore, there are three fixing inserts 8, and the positions of the three fixing inserts 8 constitute three vertices of a triangle.

[0107] Specifically, the positions of the three fixing inserts 8 constitute the three vertices of a triangle, thereby forming a triangular lock. The triangular structure has good stability, and the triangular lock formed can further enhance the fixing effect of the sealed pole and the cabinet body, preventing it from shifting or loosening during operation, making the sealed pole more suitable for high-voltage switch cabinets.

[0108] It should be noted that the attached Figure 1 The triangle formed by the dotted lines in the figure can be understood as the fixing inserts 8 together forming a triangular frame to strengthen the connection with the cabinet.

[0109] It is understandable that those skilled in the art can make equivalent substitutions or changes based on the technical solution and inventive concept of the present invention, and all these changes or substitutions should fall within the protection scope of the present invention.

Claims

1. A sealed pole, characterized in that: include: A pole body, comprising a vacuum interrupter and an insulating resin layer wrapping the vacuum interrupter; The moving end shielding seat is formed by metal casting and the outer surface of the metal is covered with an insulating resin layer; The static end shielding seat is formed by metal casting and the outer surface of the metal is covered with an insulating resin layer; The insulating resin layers of the pole body, the moving end shielding seat and the static end shielding seat are integrally cast to form a whole.

2. The sealed pole according to claim 1, characterized in that: The movable end shielding seat is located at the first end of the pole body, and the movable end shielding seat includes a first connecting plate and three first shielding plates extending upward from the first connecting plate, and the first connecting plate and the first shielding plate together enclose a first shielding cavity, and the first end of the vacuum arc extinguishing chamber is located in the first shielding cavity, and is used to connect with the operating mechanism in the first shielding cavity, wherein the outer surface of the first shielding cavity enclosed by the first connecting plate and the first shielding plate is covered by the insulating resin, and the inner surface of the first shielding cavity is a metal surface.

3. The sealed pole according to claim 1, characterized in that: The static end shielding seat is located at the second end of the pole body, and the static end shielding seat includes a second connecting plate and two second shielding plates extending downward from the second connecting plate, the second shielding plates are relatively arranged on opposite sides of the second connecting plate, the second connecting plate and the second shielding plate are enclosed to form a second shielding cavity, the connection between the second end of the vacuum arc extinguishing chamber and the conductive part is located in the second shielding cavity, the inner surface and the outer surface of the second shielding plate are covered by the insulating resin, and the inner surface of the second shielding cavity formed by the second connecting plate is a metal surface.

4. The sealed pole according to claim 2, characterized in that: The first connecting plate is connected to the first end of the pole body by pouring the insulating resin; The first connecting plate is arranged toward the first end, and is provided with a through hole connected to the vacuum arc extinguishing chamber. The first end of the pole body is provided with a movable end for connecting to an operating mechanism, and the movable end extends into the interior of the vacuum arc extinguishing chamber through the through hole and can move up and down in the through hole.

5. The sealed pole according to claim 3, characterized in that: The second connecting plate is arranged toward the second end of the vacuum arc extinguishing chamber. A first connecting hole is provided on the second connecting plate. The first connecting hole is used for a connecting member to pass through so as to lock the second connecting plate and the second end.

6. The sealed pole according to any one of claims 1 to 5, characterized in that: The pole body comprises a cylinder forming the vacuum interrupter, a silicone sleeve wrapping the outer surface of the cylinder, and the insulating resin layer covering the outer surface of the silicone sleeve.

7. The sealed pole according to claim 6, characterized in that: A boss is protruded from the first connecting plate of the moving end shielding seat toward the vacuum interrupter chamber, and the boss is in contact with the top surface of the silicone sleeve.

8. The sealed pole according to any one of claims 1 to 5, characterized in that: The surface of the pole body is provided with a first insulating plate protruding from the surface, the first insulating plate is integrally connected to the pole body by casting through the insulating resin, the first insulating plate is located on a side of the pole body used for connecting with the operating mechanism, and the first insulating plate is arranged between the moving end shielding seat and the static end shielding seat.

9. The sealed pole according to claim 8, characterized in that: Also includes: A second insulating plate and a third insulating plate, the second insulating plate and the third insulating plate are both located on the side of the pole body away from the first insulating plate, the second insulating plate is correspondingly arranged on the end where the moving end shielding seat is located, the third insulating plate is correspondingly arranged on one end of the static end shielding seat, and the second insulating plate and the third insulating plate are both cast and connected to the pole body as a whole through the insulating resin.

10. The sealed pole according to any one of claims 1 to 5, characterized in that: The pole body is also provided with a fixing insert, which is used to fix the pole body. The pole body and the fixing insert are connected as one body by pouring the insulating resin.

11. The sealed pole according to claim 10, characterized in that: The fixing inserts include three parts, and the positions of the three fixing inserts constitute three vertices of a triangle.

12. A circuit breaker, characterized in that: It comprises at least one of the sealed poles and operating mechanism as described in claims 1 to 11, wherein a moving conductive rod connected to the operating mechanism is installed at the first end of the sealed pole, the moving conductive rod is located in a cavity surrounded by a moving end shielding seat of the sealed pole, the operating mechanism drives the moving conductive rod to move, and a static conductive rod cooperating with the moving conductive rod to realize the connection or disconnection of the circuit breaker is installed at the second end of the sealed pole.

13. A ring main unit, characterized in that: The invention comprises a cabinet and a circuit breaker as claimed in claim 12 arranged in the cabinet.

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