Insulating pull rod and manufacturing method thereof

Abstract

The invention relates to the field of power equipment, and discloses an insulating pull rod and a manufacturing method thereof.The insulating pull rod comprises an insulating part, a voltage sensor, a clamping structure, a connecting rod and a lead, the voltage sensor is located in the insulating part, the clamping structure is arranged on the voltage sensor, and the voltage sensor is buckled with the voltage sensor through the clamping structure; the connecting rod is located at the end of the insulating part and connected with the voltage sensor, and the lead is connected with the end, away from the connecting rod, of the voltage sensor. According to the invention, the clamping structure is arranged on the voltage sensor, so that the voltage sensor is tightly combined with the insulating part through the clamping structure when the insulating part is poured, and the phenomenon that the voltage sensor is loosened on the insulating part is prevented.

Description

Technical Field

[0001] The present application relates to the field of electric power equipment, and in particular to an insulating pull rod and a manufacturing method thereof. Background Art

[0002] In the power transmission and distribution system, the insulating rod is a key electrical isolation and safety component, and its performance and reliability are crucial. In order to improve the intelligence level of system operation, the current technology trend tends to integrate voltage sensors inside the insulating rod to monitor the circuit voltage status in real time. Capacitive voltage sensors and resistive voltage sensors are the first choice for such applications due to their high precision and stability. However, these two sensors generally use ceramics as the main component material. Although ceramic materials have excellent electrical properties and mechanical strength, their smooth surface characteristics bring challenges to the packaging and fixation of sensors.

[0003] Specifically, the surface of ceramic materials is smooth and non-porous, making it difficult to form a strong bonding interface with the external insulation layer or packaging material, and it is not easy to combine. This not only affects the overall structural stability of the voltage sensor and the insulating rod, but may also cause the sensor to loosen or crack due to vibration, temperature changes and other factors during long-term use, thereby affecting the accuracy of voltage measurement and the safety of the system. Summary of the invention

[0004] In view of this, the purpose of the present application is to overcome the deficiencies in the prior art and to provide an insulating pull rod and a method for manufacturing the same.

[0005] To achieve the above objectives, the technical solutions adopted in this application are as follows:

[0006] This application provides:

[0007] An insulating pull rod, comprising:

[0008] Insulation parts;

[0009] A voltage sensor, wherein the voltage sensor is located inside the insulating member;

[0010] A clamping structure, wherein the clamping structure is arranged on the voltage sensor, and the voltage sensor is buckled with the voltage sensor through the clamping structure;

[0011] A connecting rod, the connecting rod is located at an end of the insulating member, and the connecting rod is connected to the voltage sensor;

[0012] A lead wire is connected to an end of the voltage sensor away from the connecting rod.

[0013] Furthermore, the clamping structure is arranged on the outer surface of the voltage sensor in the axial direction, and the clamping structure is a combination of one or more of a groove and a protrusion.

[0014] Furthermore, the insulating member includes a first insulating layer and a second insulating layer, the first insulating layer is located inside the second insulating layer, and the voltage sensor is buckled and connected to the first insulating layer through the clamping structure.

[0015] Furthermore, the first insulating layer includes an insulating portion connected to the voltage sensor, and a clamping portion is provided on an outer surface of the insulating portion.

[0016] Furthermore, a telescopic guide structure is provided at the end of the insulating member, and the telescopic guide structure comprises:

[0017] A fixing member, wherein the fixing member is arranged inside the insulating member, a sliding cavity is formed inside the fixing member, the sliding cavity has an opening, the connecting rod is partially located in the sliding cavity, and the connecting rod can move in the sliding cavity;

[0018] A cover plate, the cover plate being fixedly mounted at the opening of the sliding cavity;

[0019] An elastic telescopic member, wherein the elastic telescopic member is located inside the sliding cavity, and one end of the elastic telescopic member abuts against the connecting rod.

[0020] Furthermore, the fixing member comprises a cup body, an outer surface of an end portion of the cup body is provided with a first embedded portion, and an outer surface of another end portion of the cup body away from the first embedded portion is provided with a second embedded portion.

[0021] Furthermore, a conductive structure is mounted and connected to the voltage sensor, and the conductive structure includes:

[0022] A first shielding net, wherein the first shielding net is fixedly arranged at an end of the voltage sensor;

[0023] A second shielding net, wherein the second shielding net is fixedly arranged at an end of the voltage sensor in a direction away from the first shielding net;

[0024] A conductive rod, the conductive rod is fixedly mounted on the first shielding net;

[0025] Wherein, the lead wire is connected to the second shielding net.

[0026] The present application provides a method for manufacturing an insulating pull rod, comprising:

[0027] S100: pressing and sintering the voltage sensor blank;

[0028] S200: Both ends of the voltage sensor are plated with conductive metal, a conductive rod is welded to the first shielding net, and then the first shielding net is spot welded to the end of the voltage sensor, the end of the voltage sensor away from the first shielding net is spot welded to the second shielding net, and the lead is welded to the second shielding net;

[0029] S300: The voltage sensor is subjected to vulcanization spraying or is placed in a first mold for casting to form a first insulating layer;

[0030] S400: preheating the voltage sensor and the first insulating layer and heating the second mold;

[0031] S500: placing the voltage sensor, the first insulating layer and the fixing member in a second mold and casting them under pressure to form a second insulating layer;

[0032] S600: maintaining the pressure of the second insulating layer;

[0033] S700: Demoulding.

[0034] Furthermore, after the voltage sensor is pressed into a blank, it is processed to form a groove or a protrusion, and the surface of the voltage sensor after being pressed into the blank and the first insulating layer after being formed are subjected to a roughness increasing treatment.

[0035] Furthermore, the preheating temperature of the voltage sensor and the first insulating layer is 100°C to 150°C; the heating temperature of the second mold is 80°C to 95°C; the pressurized casting pressure value of the second mold is 80MPa to 130Mpa; and the pressure holding value of the second insulating layer is 40Mpa to 90Mpa.

[0036] The present application provides a clamping structure on the voltage sensor so that the voltage sensor is tightly combined with the insulating member through the clamping structure when the insulating member is cast, thereby preventing the voltage sensor from loosening on the insulating member.

[0037] In order to make the above-mentioned objects, features and advantages of the present application more obvious and understandable, preferred embodiments are given below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0039] Figure 1A schematic diagram of the cross-sectional structure of the insulating pull rod of the present application is shown;

[0040] Figure 2 It shows a schematic structural diagram of the voltage sensor, the conductive structure and the first insulating layer of the present application in an assembled state;

[0041] Figure 3 It shows a schematic diagram of the structure of the voltage sensor, the first shielding net, the second shielding net, the conductive rod and the lead wire in the connected state of the present application;

[0042] Figure 4 A schematic diagram of the structure of the fixing member of the present application is shown;

[0043] Figure 5 It shows a cross-sectional schematic diagram of a voltage sensor in a state where the clamping structure of the present application is in a groove;

[0044] Figure 6 It shows a cross-sectional schematic diagram of a voltage sensor in which the clamping structure of the present application is in a raised state;

[0045] Figure 7 A schematic diagram of a method for manufacturing an insulating pull rod of the present application is shown.

[0046] Description of main component symbols:

[0047] 100-insulating member; 110-first insulating layer; 111-insulating portion; 112-clamping portion; 120-second insulating layer; 200-voltage sensor; 300-clamping structure; 400-connecting rod; 500-lead; 600-telescopic guide structure; 610-fixing member; 611-cup body; 612-first embedded portion; 613-second embedded portion; 620-sliding cavity; 630-cover plate; 640-elastic telescopic member; 700-conductive structure; 710-first shielding net; 720-second shielding net; 730-conductive rod. DETAILED DESCRIPTION

[0048] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0049] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like 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 application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0050] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0051] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or 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 this application can be understood according to specific circumstances.

[0052] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0053] Example:

[0054] In order to realize the intelligent implementation of the insulating rod to detect the voltage, a corresponding voltage sensor will be arranged inside the insulating rod. The existing sensors are mostly made of ceramic materials, but their smooth surface characteristics make it difficult to combine with other materials. After long-term use, they are prone to loosening. For this reason, the present application sets a clamping structure 300 on the outer surface of the voltage sensor, and the clamping structure 300 is clamped with the insulating member 100 to fix the voltage sensor 200.

[0055] Specifically, the present application provides an insulating pull rod for use in a circuit breaker, wherein the insulating pull rod includes an insulating member 100 , a voltage sensor 200 , a clamping structure 300 , a connecting rod 400 , and a lead wire 500 .

[0056] The voltage sensor 200 is located inside the insulating member 100, the snap-fit ​​structure 300 is arranged on the voltage sensor 200, the voltage sensor 200 is buckled with the voltage sensor 200 through the snap-fit ​​structure 300, the connecting rod 400 is located at the end of the insulating member 100, the connecting rod 400 is connected to the voltage sensor 200, and the lead 500 is connected to the end of the voltage sensor 200 away from the connecting rod 400.

[0057] See also Figure 1 As shown, the connecting rod 400 at the top of the insulating member 100 is connected to the voltage sensor 200, and the high voltage electricity is introduced into the voltage sensor 200 through the connecting rod 400, and the high voltage is converted into a low voltage signal through the voltage sensor 200, and finally led out through the lead 500 connected to the other end of the voltage sensor 200, so that the low voltage signal is processed by an external compatible device or equipment, so as to obtain the voltage value of the high voltage electricity at this time, and realize the detection function.

[0058] Exemplarily, the voltage sensor 200 may be a resistive voltage sensor or a capacitive voltage sensor, which may be selected according to actual needs and is not limited here.

[0059] Furthermore, in the present embodiment, a snap-fit ​​structure 300 is provided on the outer surface of the voltage sensor 200, and the snap-fit ​​structure 300 can be embedded in the insulating member 100, thereby realizing the snap-fit ​​between the snap-fit ​​structure 300 and the insulating member 100, so that the voltage sensor 200 is firmly set and embedded in the insulating member 100, and the voltage sensor 200 is limited at multiple angles by combining the snap-fit ​​structure 300 with the insulating member 100, so that the voltage sensor 200 is loosened, and the voltage sensor 200 can be tightly combined with the insulating member 100.

[0060] The clamping structure 300 is disposed on the outer surface of the voltage sensor 200 in the axial direction. The clamping structure 300 is a combination of one or more of a groove and a protrusion.

[0061] See also Figure 1 , Figure 2 , Figure 5 and Figure 6 As shown, in order to enable the voltage sensor 200 to be tightly combined with the insulating part 100, the shape of the snap-fit ​​structure 300 can be a groove or a protrusion, and the groove or the protrusion can be used to achieve a tight fit with the insulating part 100. Specifically, in the present embodiment, the insulating part 100 is formed by casting. During the casting process of the insulating part 100, if the snap-fit ​​structure 300 is a protrusion, the casting material of the insulating part 100 will cover the protrusion and tightly combine to achieve the snap-fit ​​function; if the snap-fit ​​structure 300 is a groove, the casting of the insulating part 100 will enter the groove, and the snap-fit ​​with the insulating part 100 can also be achieved, so that the position of the voltage sensor 200 can be limited.

[0062] For example, see Figure 5 and Figure 6 As shown, Figure 5 The cross-sectional view of the voltage sensor 200 is shown in the state where the clamping structure 300 is in a groove. Figure 6 What is shown is a cross-sectional view of the voltage sensor 200 in a convex state of the snap-fit ​​structure 300. In the present embodiment, the outer surface of the voltage sensor 200 may be a protrusion or a groove, or the outer surface of the voltage sensor 200 may be provided with both the protrusion and the groove. When the outer surface of the voltage sensor 200 is provided with both the protrusion and the groove, the upper part of the outer surface of the voltage sensor 200 is provided with the protrusion, and the lower part of the outer surface of the voltage sensor 200 is provided with the groove, wherein the upper and lower positional relationship of the protrusion and the groove on the outer surface of the voltage sensor 200 may be designed according to actual needs, which is not limited here, and the proportion and position of the protrusion and the groove on the outer surface of the voltage sensor 200 are not limited; further, the protrusion and the groove on the outer surface of the voltage sensor 200 may be alternately arranged along the height direction of the voltage sensor 200, or the outer surface of the voltage sensor 200 between the protrusion and the groove may be smoothly arranged, which is not limited here.

[0063] In this embodiment, the outer surface of the voltage sensor 200 is a serrated or umbrella-shaped protrusion, which can not only increase the bonding area with the insulating member 100 and thus improve the bonding force, thereby ensuring the reliability of the bonding between the voltage sensor 200 and the insulating member 100, but also increase a certain creepage distance and improve safety.

[0064] The insulating member 100 includes a first insulating layer 110 and a second insulating layer 120 . The first insulating layer 110 is located inside the second insulating layer 120 . The voltage sensor 200 is buckled and connected to the first insulating layer 110 via the snap-fit ​​structure 300 .

[0065] See also Figure 1 As shown, the insulating member 100 has a multi-layer structure. In the present embodiment, the insulating member 100 has two layers, that is, the insulating member 100 includes a first insulating layer 110 and a second insulating layer 120. The materials of the first insulating layer 110 and the second insulating layer 120 may be the same or different. Here, the first insulating layer 110 and the second insulating layer 120 use different materials. Specifically, the first insulating layer 110 is epoxy resin, and the second insulating layer 120 is engineering plastic. Further, the engineering plastic is a thermoplastic material, that is, it can flow and deform after being heated to a predetermined temperature, and can maintain a preset shape after cooling. Exemplarily, the engineering plastic can be a material that can realize a casting function, such as PC (polycarbonate), PA (nylon) material, etc. For example, PA (nylon) 66 plus 30% glass fiber and other materials can be used. In the present embodiment, other materials that can realize insulation can be selected as needed, and the specifics are not limited here.

[0066] In this embodiment, in order to prevent the voltage sensor 200 from cracking under extreme environments such as high or low temperatures, a first insulating layer 110 is further provided on the surface of the voltage sensor 200. The first insulating layer 110 is used as a buffer layer to prevent cracking due to excessively low or high temperatures. The first insulating layer 110 can also be used as a connecting layer to make the voltage sensor 200 more firmly connected to the second insulating layer 120.

[0067] See also Figure 1 As shown, in this embodiment, the outer surface of the second insulating layer 120 is also provided with a phase umbrella skirt structure to increase the creepage distance.

[0068] Continue reading Figure 1 As shown, the first insulating layer 110 is located in the inner layer, the first insulating layer 110 covers the voltage sensor 200 , and the second insulating layer 120 covers the first insulating layer 110 .

[0069] The first insulating layer 110 includes an insulating portion 111 connected to the voltage sensor 200 , and a clamping portion 112 is disposed on an outer surface of the insulating portion 111 .

[0070] See also Figure 1 and Figure 2As shown, when the second insulating layer 120 is poured, in order to enable the first insulating layer 110 and the second insulating layer 120 to be fully contacted and combined, a clamping portion 112 is provided on the outer surface of the insulating portion 111 to make it fully contact with the inner surface of the second insulating layer 120. In this embodiment, the clamping portion 112 can be a protrusion or a groove. Figure 2 What is shown is a cross-sectional view of the insulating part 111 with the clamping part 112 in a raised state. Furthermore, the grooves and the protrusions may exist simultaneously on the outer surface of the insulating part 111. For example, the upper half of the outer surface of the insulating part 111 is a protrusion, and the lower half of the outer surface of the insulating part 111 is a groove. The protrusions and grooves on the outer surface of the insulating part 111 may also be alternately arranged. It can be understood that the distribution ratio and position of the protrusions and grooves on the outer surface of the insulating part 111 may be set as needed, and no specific restrictions are made here.

[0071] A telescopic guide structure 600 is disposed at the end of the insulating member 100 . The telescopic guide structure 600 includes a fixing member 610 , a cover plate 630 and an elastic telescopic member 640 .

[0072] In this embodiment, the fixing member 610 is arranged inside the insulating member 100, and a sliding cavity 620 is formed inside the fixing member 610. The sliding cavity 620 has an opening, and the connecting rod 400 is partially located in the sliding cavity 620. The connecting rod 400 can move in the sliding cavity 620, and the cover plate 630 is fixedly installed at the opening of the sliding cavity 620. The elastic telescopic member 640 is located inside the sliding cavity 620, and one end of the elastic telescopic member 640 abuts against the connecting rod 400.

[0073] See also Figure 1 As shown, in order to maintain the contact force between the connecting rod 400 and other components, the elastic telescopic member 640 provides the contact force for the connecting rod 400. Specifically, the fixing member 610 is embedded in the top of the second insulating layer 120. The fixing member 610 has a sliding cavity 620 inside. The elastic telescopic member 640 is located inside the sliding cavity 620. The connecting rod 400 is slidably arranged in the sliding cavity 620 and abuts against the elastic telescopic member 640. The cover plate 630 closes the opening of the sliding cavity 620. The cover plate 630 needs to open a through hole while closing the opening of the sliding cavity 620 to avoid the connecting rod 400, so that the connecting rod 400 can slide in the sliding cavity 620.

[0074] Exemplarily, the elastic telescopic member 640 is a compression spring, and the elastic force of the compression spring provides contact force for the connecting rod 400 .

[0075] The fixing member 610 includes a cup body 611 , a first embedding portion 612 is disposed on an outer surface of an end of the cup body 611 , and a second embedding portion 613 is disposed on an outer surface of another end of the cup body 611 away from the first embedding portion 612 .

[0076] See also Figure 1 and Figure 4 As shown, after the second insulating layer 120 is cast, in order to prevent the fixing member 610 and the second insulating layer 120 from shifting in position, it is necessary to limit the fixing member 610 and the second insulating layer 120 to prevent the fixing member 610 from being separated from the second insulating layer 120, thereby limiting the fixing member 610 in the axial direction.

[0077] Continue reading Figure 1 and Figure 4 As shown, the cup body 611 is made of metal. In the present embodiment, the cup body 611, the first embedded portion 612, and the second embedded portion 613 are integrally formed. The first embedded portion 612 and the second embedded portion 613 both protrude from the outer surface of the cup body 611, that is, when the second insulating layer 120 is poured, the first embedded portion 612 and the second embedded portion 613 will be covered. For this reason, the cup body 611 is embedded and fixedly connected with the second insulating layer 120 through the first embedded portion 612 and the second embedded portion 613 to prevent the cup body 611 from moving. Furthermore, the first embedded portion 612 and the second embedded portion 613 can be annular protrusions, annular grooves, point-shaped protrusions, point-shaped grooves, etc. It can be understood that the positions of the first embedded portion 612 and the second embedded portion 613 can be set at any position on the outer surface of the cup body 611, and can be set according to actual needs, which is not limited here.

[0078] A conductive structure 700 is installed and connected to the voltage sensor 200, and the conductive structure 700 includes a first shielding net 710, a second shielding net 720 and a conductive rod 730. The first shielding net 710 is fixedly arranged at the end of the voltage sensor 200, the second shielding net 720 is fixedly arranged at the end of the voltage sensor 200 away from the first shielding net 710, and the conductive rod 730 is fixedly installed on the first shielding net 710, wherein the lead 500 is connected to the second shielding net 720.

[0079] See also Figure 3As shown, in order to prevent the electric field generated by the external high voltage electricity from affecting the voltage sensor 200, a first shielding net 710 and a second shielding net 720 are respectively arranged at the two ends of the voltage sensor 200, and the external electric field is shielded by the first shielding net 710 and the second shielding net 720. Specifically, the first shielding net 710 and the second shielding net 720 are bowl-shaped, and the concave parts of the first shielding net 710 and the second shielding net 720 are arranged face to face, that is, the first shielding net 710 and the second shielding net 720 are arranged inverted.

[0080] In this embodiment, the first shielding net 710 is located at the top of the voltage sensor 200, the second shielding net 720 is located at the bottom of the voltage sensor 200, the conductive rod 730 is fixedly connected to the first shielding net 710, specifically by welding, and the lead 500 is fixedly connected to the second shielding net 720 at the bottom, which can also be connected by welding.

[0081] like Figure 7 As shown, this embodiment also provides a method for manufacturing an insulating pull rod, and the method for manufacturing an insulating pull rod includes:

[0082] S100: pressing and sintering the voltage sensor 200 blank;

[0083] S200: Conductive metal is plated at both ends of the voltage sensor 200, and the conductive rod 730 is welded to the first shielding net 710, and then the first shielding net 710 is spot welded to the end of the voltage sensor 200, and the end of the voltage sensor 200 away from the first shielding net 710 is spot welded to the second shielding net 720, and the lead 500 is welded to the second shielding net 720;

[0084] S300: The voltage sensor 200 is subjected to vulcanization spraying or is placed in a first mold for casting to form a first insulating layer 110;

[0085] S400: preheating the voltage sensor 200 and the first insulating layer 110 and heating the second mold;

[0086] S500: placing the voltage sensor 200, the first insulating layer 110 and the fixing member 610 into a second mold and casting them under pressure to form a second insulating layer 120;

[0087] S600: Maintaining the pressure of the second insulating layer 120;

[0088] S700: Demoulding.

[0089] In this embodiment, the material for making the voltage sensor 200 is first pressed into a blank, and then the blank of the voltage sensor 200 is machined, for example, by using a cutter, etc., so that the outer surface of the voltage sensor 200 is processed into the shape of the snap-fit ​​structure 300, that is, a protrusion or a groove is formed on the outer surface of the voltage sensor 200, so that the voltage sensor 200 and the first insulating layer 110 can be tightly combined in the subsequent pouring process of the first insulating layer 110. After the snap-fit ​​structure 300 is formed on the outer surface of the voltage sensor 200, the blank of the voltage sensor 200 is sintered to complete the production of the voltage sensor 200.

[0090] It should be noted that the protrusions or grooves on the outer surface of the voltage sensor 200 can be formed by machining after the blank is formed, or can be formed during the pressing process, that is, using a corresponding pressing mold to press the manufacturing material of the voltage sensor 200 in a pressing mold. In practice, the corresponding method can be selected according to needs, and no specific limitation is made here.

[0091] The voltage sensor 200 is made of ceramic. In order to connect the voltage sensor 200 to other conductive metals, it is necessary to plate conductive metals on both ends of the voltage sensor 200. Specifically, in the present embodiment, the conductive metal is silver, that is, silver-plated. One end of the voltage sensor 200 needs to be welded with a conductive rod 730. However, during welding, the conductive rod 730 needs to be partially in contact with the voltage sensor 200 to generate high temperature, and then cooled. In this way, tiny cracks are formed on the surface of the voltage sensor 200. The cracks are difficult to find in the initial stage, but they are easy to increase during multiple temperature contractions and vibrations, causing the voltage sensor 200 to crack, which is easy to cause safety accidents during actual construction. Therefore, in order to prevent the use of If the surface of the voltage sensor 200 is cracked, the conductive rod 730 is welded on the first shielding net 710, and then the first shielding net 710 is welded to the end of the voltage sensor 200 by spot welding, so as to achieve connection with the conductive rod 730. Similarly, the lead 500 and the second shielding net 720 can be directly welded first, and then the second shielding net 720 is also spot welded to the other end of the voltage sensor 200 to achieve connection between the lead 500 and the voltage sensor 200. Through the above-mentioned spot welding connection method of the first shielding net 710, the second shielding net 720 and the voltage sensor 200, the original large-area plane welding method is converted into spot welding of multiple small points, thereby greatly reducing uneven heating of the voltage sensor 200 and the generation of local stress.

[0092] After the first shielding net 710 and the second shielding net 720 are welded to the voltage sensor 200, the surface of the voltage sensor 200 is vulcanized and sprayed, so that the material of the first insulating layer 110 is sprayed on the surface of the voltage sensor 200, or the voltage sensor 200 is placed in a first mold, and the first insulating layer 110 is located on the surface of the voltage sensor 200 by casting, such as Figure 2 As shown, at this time, the voltage sensor 200 , the first shielding mesh 710 , the second shielding mesh 720 and the conductive rod 730 are located inside the first insulating layer 110 .

[0093] It should be noted that the shape of the clamping portion 112 in the first insulating layer 110 can be formed by casting in the first mold, or can be formed by mechanical processing (using a cutter to cut) after casting.

[0094] After the first insulating layer 110 is located on the outer surface of the voltage sensor 200, the first insulating layer 110, the voltage sensor 200, the first shielding net 710, the second shielding net 720 and the conductive rod 730 are heated to a certain temperature. During this process, the second mold is heated to a predetermined temperature. Then, the first insulating layer 110, the voltage sensor 200, the first shielding net 710, the second shielding net 720, the conductive rod 730 and the lead 500 are placed in the second mold. Next, the second insulating layer 120 is injected into the second mold by high-pressure injection to form the second insulating layer 120. During the solidification and cooling process of the second insulating layer 120, pressure maintenance treatment is performed, and demolding is completed after the pressure maintenance is completed.

[0095] After the voltage sensor 200 is pressed into a blank, it is processed to form grooves or protrusions, and the surface of the voltage sensor 200 after being pressed into a blank and the first insulating layer 110 after being formed are subjected to a roughness increasing process.

[0096] In this embodiment, when the voltage sensor 200 is pressed but before being fired, in order to enable the voltage sensor 200 to be more tightly bonded to the first insulating layer 110, the roughness of the blank is increased. Specifically, roughening, sandblasting, etc. can be used to increase the roughness of its surface to provide bonding force between the voltage sensor 200 and the first insulating layer 110. Furthermore, after the first insulating layer 110 is formed on the voltage sensor 200, in order to increase the bonding force between the first insulating layer 110 and the second insulating layer 120, it is also necessary to increase the roughness of the outer surface of the first insulating layer 110. The method of increasing the roughness is the same as that of the voltage sensor 200, which will not be described in detail here. For details, please refer to the method of increasing the roughness of the voltage sensor 200.

[0097] The preheating temperature of the voltage sensor 200 and the first insulating layer 110 is 100°C to 150°C; the heating temperature of the second mold is 80°C to 95°C; the pressurized casting pressure value of the second mold is 80MPa to 130Mpa; and the pressure holding value of the second insulating layer 120 is 40Mpa to 90Mpa.

[0098] In order to prevent the temperature of the second insulating layer 120 from being too different from that of the first insulating layer 110, resulting in a sharp shrinkage, it is necessary to heat the first insulating layer 110, the voltage sensor 200, the first shielding net 710, the second shielding net 720 and the conductive rod 730 to a certain temperature, so as to reduce the temperature difference between the second insulating layer 120 material and prevent the second insulating layer 120 from rapidly cooling and shrinking to form a cavity during the pouring process. In this embodiment, the temperature of the voltage sensor 200, the first insulating layer 110, the first shielding net 710, etc. needs to be between 100°C and 150°C. Specifically, the preheating temperature can be: 100°C, 120°C, 130°C, 140°C, 150°C, etc.; in order to prevent the second insulating layer 120 material entering the second mold from cooling rapidly, it is necessary to heat the second mold The second mold is heated at a temperature between 80°C and 95°C, and the temperature can be 80°C, 85°C, 90°C, 95°C, etc. The second mold can be heated by heat-conducting oil, and the temperature of the heat-conducting oil is between 100°C and 120°C, and the specific temperature of the heat-conducting oil can be 100°C, 115°C, 120°C, etc. When the second insulating layer 120 material is poured into the second mold to form the second insulating layer 120, in order to make the material quickly enter the second mold, it is necessary to increase the pressure of the material. Here, the pressure value is 80Mpa to 130Mpa, and specifically can be 80Mpa, 90Mpa, 100Mpa, 110Mpa, 120Mpa, 130Mpa, etc. The temperature of the second insulating layer 120 material can be set according to actual needs, which is not limited here, and can be adaptively adjusted according to the melting points of different types of materials.

[0099] When the second insulating layer 120 material is solidified and formed in the second mold, in order to prevent the second insulating layer 120 from shrinking and forming a cavity, the second insulating layer 120 needs to be pressurized, that is, the material is continuously injected into the second mold under a certain pressure. When the second insulating layer 120 shrinks, the material will continue to be injected into the second mold to fill the cavity caused by the shrinkage and achieve material filling. In addition, due to the continuous pressure of the pressure maintenance, the density of the second insulating layer 120 is increased, and the strength of the second insulating layer 120 is improved. In this embodiment, the pressure value of the pressure maintenance is 40MPa~90MPa, and specifically 40MPa, 50MPa, 60MPa, 70MPa, 80MPa, 90MPa, etc. can be used.

[0100] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0101] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. An insulating pull rod, characterized in that: include: Insulating member (100); a voltage sensor (200), the voltage sensor (200) being located inside the insulating member (100); a snap-fit ​​structure (300), the snap-fit ​​structure (300) being arranged on the voltage sensor (200), the voltage sensor (200) being snap-fitted with the voltage sensor (200) via the snap-fit ​​structure (300); A connecting rod (400), the connecting rod (400) being located at an end of the insulating member (100), the connecting rod (400) being connected to the voltage sensor (200); A lead wire (500) is connected to an end of the voltage sensor (200) in a direction away from the connecting rod (400).

2. The insulating pull rod according to claim 1, characterized in that: The clamping structure (300) is arranged on the outer surface of the voltage sensor (200) in the axial direction, and the clamping structure (300) is a combination of one or more of a groove and a protrusion.

3. The insulating pull rod according to claim 1, characterized in that: The insulating member (100) comprises a first insulating layer (110) and a second insulating layer (120); the first insulating layer (110) is located inside the second insulating layer (120); and the voltage sensor (200) is snap-connected to the first insulating layer (110) via the snap-connecting structure (300).

4. The insulating pull rod according to claim 3, characterized in that: The first insulating layer (110) comprises an insulating portion (111) connected to the voltage sensor (200), and a clamping portion (112) is provided on an outer surface of the insulating portion (111).

5. The insulating pull rod according to claim 1, characterized in that: A telescopic guide structure (600) is provided at the end of the insulating member (100), and the telescopic guide structure (600) comprises: a fixing member (610), the fixing member (610) being arranged inside the insulating member (100), a sliding cavity (620) being formed inside the fixing member (610), the sliding cavity (620) having an opening, the connecting rod (400) being partially located in the sliding cavity (620), and the connecting rod (400) being able to move in the sliding cavity (620); a cover plate (630), the cover plate (630) being fixedly mounted at the opening of the sliding cavity (620); An elastic telescopic member (640), wherein the elastic telescopic member (640) is located inside the sliding cavity (620), and one end of the elastic telescopic member (640) is in contact with the connecting rod (400).

6. The insulating pull rod according to claim 5, characterized in that: The fixing member (610) comprises a cup body (611), the outer surface of an end of the cup body (611) is provided with a first embedded portion (612), and the outer surface of the other end of the cup body (611) away from the first embedded portion (612) is provided with a second embedded portion (613).

7. The insulating pull rod according to claim 1, characterized in that: The voltage sensor (200) is mounted and connected with a conductive structure (700), wherein the conductive structure (700) comprises: A first shielding net (710), the first shielding net (710) being fixedly arranged at an end of the voltage sensor (200); a second shielding net (720), the second shielding net (720) being fixedly arranged at an end of the voltage sensor (200) in a direction away from the first shielding net (710); A conductive rod (730), wherein the conductive rod (730) is fixedly mounted on the first shielding net (710); Wherein, the lead wire (500) is connected to the second shielding net (720).

8. A method for manufacturing an insulating pull rod, characterized in that: include: Pressing a voltage sensor (200) blank and sintering it; Both ends of the voltage sensor (200) are plated with conductive metal, a conductive rod (730) is welded to a first shielding net (710), and then the first shielding net (710) is spot welded to an end of the voltage sensor (200), an end of the voltage sensor (200) away from the first shielding net (710) is spot welded to a second shielding net (720), and a lead wire (500) is welded to the second shielding net (720); The voltage sensor (200) is subjected to vulcanization spraying or is placed in a first mold for casting to form a first insulating layer (110); Preheating the voltage sensor (200) and the first insulating layer (110) and heating the second mold; The voltage sensor (200), the first insulating layer (110) and the fixing member (610) are placed in a second mold and cast under pressure to form a second insulating layer (120); Maintaining the pressure of the second insulating layer (120); Demoulding.

9. The method for manufacturing an insulating pull rod according to claim 8, characterized in that: The voltage sensor (200) is pressed into a blank and then processed to form a groove or a protrusion, and a roughness increasing treatment is performed on the surface of the voltage sensor (200) after being pressed into the blank and the first insulating layer (110) after being formed.

10. The method for manufacturing an insulating pull rod according to claim 8, characterized in that: The preheating temperature of the voltage sensor (200) and the first insulating layer (110) is 100°C to 150°C; the heating temperature of the second mold is 80°C to 95°C; the pressure value of the second mold pressurized casting is 80MPa to 130Mpa; and the pressure holding value of the second insulating layer (120) is 40Mpa to 90Mpa.

Images