Current transformer and coil shielding combination structure and pouring filling structure thereof

Abstract

The utility model discloses a current transformer and a coil shielding combination structure and a pouring and filling structure thereof, and the pouring and filling structure comprises a filling assembly and a pouring material, the filling assembly is used for being arranged in a pouring area between a coil and a shielding cylinder of the coil shielding combination structure. The pouring material is used for being poured in the remaining pouring area between the coil and the shielding cylinder and covers the filling assembly. According to the scheme, the pouring and filling structure of the coil shielding combination structure is improved, original pouring materials are reserved, and the filling assembly is additionally arranged; wherein the filling assembly is arranged in the pouring area between the coil and the shielding cylinder to occupy the space of the pouring area, and then the remaining pouring area between the coil and the shielding cylinder is poured and filled with the pouring material, so that the pouring amount of the pouring material can be reduced, and the pouring and filling cost of the coil shielding combination structure is reduced; therefore, the production cost of the current transformer can be saved.

Description

Technical Field

[0001] The utility model relates to the technical field of current transformers, and particularly relates to a current transformer, a coil shielding combination structure thereof, and a casting and filling structure. Background Art

[0002] A current transformer, abbreviated as CT, is a special transformer that converts the primary current into the secondary current in proportion according to the principle of electromagnetic induction through the configuration of the turns ratio of the primary and secondary windings. The current transformer is an interface component for various protection devices and measuring instruments to truly reflect the primary current signal of the power system, and is widely used in technical fields such as power system measurement, protection, wave recording, and ranging.

[0003] Among them, the coil shielding combination structure of the current transformer includes a flange, a shielding cylinder, and a coil. The shielding cylinder is installed on the flange, the coil is sleeved into the shielding cylinder, the coil and the shielding cylinder are coaxially arranged and there is a certain interval between them, and the fixing stability of the current transformer coil affects the overall performance of the product; at present, the fixing method of the current transformer coil is: pouring liquid polyurethane material into the interval (as the casting area) between the coil and the shielding cylinder, so that the polyurethane material is filled and cured in this interval to form a stable structure in this interval, so as to fix the coil.

[0004] However, the casting material poured into the interval between the coil and the shielding cylinder is liquid polyurethane, which not only has a large usage amount but also a high cost, thus increasing the production cost of the current transformer. Content of the Utility Model

[0005] In view of this, the utility model provides a casting and filling structure for a current transformer, which can reduce the casting amount of the casting material, reduce the casting and filling cost of the coil shielding combination structure, and thus help to save the production cost of the current transformer.

[0006] To achieve the above object, the utility model provides the following technical solutions:

[0007] A casting and filling structure for a current transformer, which is applied to the coil shielding combination structure of the current transformer, includes a filling component and a casting material;

[0008] The filling component is used to be arranged in the casting area between the coil and the shielding cylinder of the coil shielding combination structure;

[0009] The casting material is used to be cast into the remaining casting area between the coil and the shielding cylinder and cover the filling component.

[0010] Preferably, the filling component is used to be distributed around the shielding cylinder.

[0011] Preferably, the filling component includes an airbag component and is used to fill air.

[0012] Preferably, the airbag assembly includes: an air duct and a plurality of airbags;

[0013] The air duct is used to surround the shielding cylinder and is provided with an inflation port;

[0014] The plurality of airbags are respectively communicated with the air duct and are distributed around the shielding cylinder.

[0015] Preferably, the air duct is evenly divided into multiple air duct units along the length direction. Each of the multiple air duct units can be torn off, and its two ends can be heat-sealed. Several of the air duct units are provided with the inflation port;

[0016] The plurality of airbags are respectively communicated with the multiple air duct units one by one.

[0017] Preferably, the side wall of the air duct is used to surround and fix to the outer peripheral wall of the shielding cylinder, the upper wall is provided with the inflation port, and the lower wall is respectively communicated with the plurality of airbags.

[0018] Preferably, the side wall of the air duct is used to surround and bond to the outer peripheral wall of the shielding cylinder.

[0019] Preferably, the material of the air duct and / or the plurality of airbags includes polyethylene.

[0020] A coil shielding combined structure of a current transformer includes: a flange, a coil, a shielding cylinder and a casting filling structure. The casting filling structure is the casting filling structure for the current transformer as described above.

[0021] A current transformer includes a coil shielding combined structure, and the coil shielding combined structure is the coil shielding combined structure of the current transformer as described above.

[0022] As can be seen from the above technical solutions, the casting filling structure for the current transformer provided by the present utility model improves the casting filling structure of the coil shielding combined structure. In addition to retaining the original casting material, a filling component is newly added. Among them, the filling component is first arranged in the casting area between the coil and the shielding cylinder to occupy the space of the casting area, and then the casting material is poured to fill the remaining casting area between the coil and the shielding cylinder. In this way, the pouring amount of the casting material can be reduced, the casting filling cost of the coil shielding combined structure can be reduced, which helps to save the production cost of the current transformer, that is, while ensuring the fixing stability of the coil, the production cost of the current transformer is reduced. Description of the Drawings

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0024] Figure 1 The top view of the coil shielding combination structure of the current transformer provided by the embodiment of the present invention;

[0025] Figure 2 is Figure 1 the A-A sectional view of;

[0026] Figure 3 The structural schematic diagram of the airbag assembly provided by the embodiment of the present invention;

[0027] Figure 4 The sectional view of the coil shielding combination structure of the current transformer provided by the embodiment of the present invention.

[0028] Among them, 1 is the flange, 2 is the coil, 3 is the shielding cylinder, 4 is the casting area, 5 is the airbag assembly, 51 is the air duct, 52 is the safety line, 53 is the airbag, 54 is the bonding area, 55 is the check valve, and 6 is the sponge rubber strip. Specific embodiments

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0030] The casting filling structure for a current transformer provided by the embodiment of the present invention is applied to the coil shielding combination structure of the current transformer and includes a filling component and a casting material;

[0031] The filling component is used to be arranged in the casting area 4 between the coil 2 and the shielding cylinder 3 of the coil shielding combination structure;

[0032] The casting material is used to be cast in the remaining casting area 4 between the coil 2 and the shielding cylinder 3 and cover the filling component.

[0033] It should be noted that, such as Figure 1 and Figure 2As shown in the figure, the coil shielding combined structure of the current transformer includes: a flange 1, a coil 2, a shielding cylinder 3, and a sponge rubber strip 6; among them, the shielding cylinder 3 is fixedly installed on the flange 1 through bolts, the flange 1 is fixedly installed on the internal support block of the housing through bolts, the coil 2 is sleeved into the shielding cylinder 3, and the gap (interval) between the coil 2 and the shielding cylinder 3 is used as the casting area 4, and adjacent coils 2 are bonded through the sponge rubber strip 6;

[0034] In addition, the casting filling structure acting on the casting area 4 between the coil 2 and the shielding cylinder 3 not only includes the casting material, but also a new filling component; among them, the filling component is first used to be arranged in the casting area 4 between the coil 2 and the shielding cylinder 3 to realize the occupation of the space of the casting area 4 between the coil 2 and the shielding cylinder 3, and then the casting material is used to be cast in the remaining casting area 4 between the coil 2 and the shielding cylinder 3 and cover the filling component, that is, the remaining casting area 4 between the coil 2 and the shielding cylinder 3 is filled by casting the casting material. In this way, the casting amount of the casting material can be reduced, the casting filling cost of the coil shielding combined structure can be reduced, and thus the production cost of the current transformer can be saved; of course, the filling component needs to be located between the coil 2 and the shielding cylinder 3 to ensure that the casting material can cover the filling component after casting and contact with the shielding cylinder 3 and the coil 2 respectively to ensure the fixing effect of the coil 2;

[0035] In addition, the original casting material is still selected in this solution; among them, the casting material is a polyurethane material with a density of 0.045 g / cm 3 , which is mixed by combined polyether and polyisocyanate, is milky white as a whole, and has high viscosity after solidification, and can reliably bond the coil 2 and the shielding cylinder 3.

[0036] It can be seen that in this solution, on the basis of the original coil shielding combined structure, the casting filling structure of the coil shielding combined structure is improved. In addition to retaining the original casting material, a new filling component is added; among them, the filling component is first arranged in the casting area 4 between the coil 2 and the shielding cylinder 3 to realize the occupation of the space of the casting area 4, and then the casting material is cast to fill the remaining casting area 4 between the coil 2 and the shielding cylinder 3, so that the casting amount of the casting material can be reduced, the casting filling cost of the coil shielding combined structure can be reduced, and the production cost of the current transformer can be saved, that is, while ensuring the fixing stability of the coil 2, the production cost of the current transformer is reduced. Of course, this will also improve the casting efficiency of the casting material. In this way, this solution is applicable to the casting scenarios of current transformers of various voltage levels and has certain effects in reducing the cost of current transformers.

[0037] In this solution, it should also be noted that the casting area 4 between the coil 2 and the shielding cylinder 3 is actually an annular casting area; to occupy more space in the annular casting area and facilitate further reduction of the amount of casting material; correspondingly, the filling component can be an annular filling component, that is, the filling component can be used to surround the shielding cylinder 3, that is, the filling component can be used to distribute around the shielding cylinder 3.

[0038] Specifically, as Figure 3 shown, the filling component includes an airbag component 5 and is used to fill with air. Among them, the airbag component 5 can first be used to surround the shielding cylinder 3 and then inject air at a certain air pressure. That is to say, in this solution, the airbag component 5 is selected as the filling component, and its filling material is air, so it is not only convenient for operation during filling, but also has the characteristics of low cost and easy operation. Of course, the setting of the airbag component 5 should ensure that it will not affect the performance of the casting material. In addition, other filling components can also be selected in this solution, such as a filling ring block, and of course the material of the filling ring block will not affect the performance of the casting material.

[0039] Furthermore, as Figure 3 and Figure 4 shown, the airbag component 5 includes: an air duct 51 and a plurality of airbags 53;

[0040] The air duct 51 is used to surround the shielding cylinder 3 and is provided with an inflation port;

[0041] The plurality of airbags 53 are respectively communicated with the air duct 51 and are distributed around the shielding cylinder 3. Among them, the air duct 51 serves as a common air duct for the plurality of airbags 53 and is used for the flow of gas during inflation. The airbags 53 are used to fill and store air. Of course, the inflation port of the air duct 51 can be opened and closed. That is to say, the airbag component 5 in this solution not only has a main air duct or common air duct (i.e., the air duct 51) that surrounds the shielding cylinder 3, but also has a plurality of branch airbags (i.e., the plurality of airbags 53) that are distributed around the shielding cylinder 3 and are respectively communicated with the above-mentioned main air duct or common air duct, so as to further improve the occupancy rate of the space in the casting area 4 and facilitate further reduction of the amount of casting material.

[0042] Still further, as Figure 3 described, the air duct 51 is evenly divided into multiple air duct units along the length direction. Each air duct unit in the multiple air duct units can be torn off, and both ends of each air duct unit can be heat-sealed. A plurality of air duct units are provided with inflation ports;

[0043] The plurality of airbags 53 are respectively communicated with the multiple air duct units.

[0044] It should be noted that, as Figure 3As shown, a plurality of safety lines 52 are evenly provided along the length direction of the air duct 51, so as to evenly divide the air duct 51 into multiple air duct monomers along the length direction; among them, the safety line 52 is a layer of shallow lines engraved on the air duct 51, which is not engraved through and can bear pressure, and is easier to tear off than other parts of the air duct 51, so that each air duct monomer can be torn off; in addition, as Figure 3 shown, an inflation port can be opened on each air duct monomer. Of course, when the airbag assembly 5 is inflated, only one inflation port can be inflated, and the air then enters the other airbags 53 along the air duct 51. That is to say, the air duct 51 of the airbag assembly 5 is set as multiple air duct monomers that can be torn off in a single section, so as to conveniently select the appropriate surrounding length of the air duct 51 according to the diameter of the shielding cylinder 3, so that the air duct 51 can be adapted to surround the shielding cylinders 3 with different diameters. Among them, after selecting the appropriate length of the air duct 51 according to the diameter of the shielding cylinder 3, for example, when the surrounding length of the air duct 51 is too long, the outermost air duct monomer can be torn off along its corresponding safety line 52, that is, the outermost air duct monomer is torn off, and then the adjacent air duct monomers are heat-sealed, and then the remaining multiple air duct monomers are surrounded on the shielding cylinder 3, and then after the coil 2 is installed, the airbag assembly 5 is inflated, and after the inflation is completed, the casting material is poured and filled in.

[0045] In this solution, as Figure 3 and Figure 4 shown, the side wall of the air duct 51 is used to surround and fix to the outer peripheral wall of the shielding cylinder 3, the upper wall is provided with an inflation port, and the lower wall is respectively communicated with a plurality of airbags 53. That is to say, the side wall of the air duct 51 is used to surround and connect to the outer peripheral wall of the shielding cylinder 3, the upper wall is used for inflation, and the air is filled downward into a plurality of airbags 53. This solution is designed in this way so that after the plurality of airbags 53 are inflated and expanded, due to the upward buoyancy of the airbags 53, they will not touch the shielding cylinder 3 or the coil 2, that is, the plurality of airbags 53 are located between the shielding cylinder 3 and the coil 2. This not only avoids blocking the flow channel of the casting material, but also ensures that the casting material is in contact with the shielding cylinder 3 and the coil 2 respectively, and ensures the fixing effect of the coil 2. In addition, as described above, the air duct 51 is evenly divided into multiple air duct monomers along the length direction. Among them, the side walls of the multiple air duct monomers are used to surround and fix to the outer peripheral wall of the shielding cylinder 3, the upper walls can all be provided with inflation ports, and the lower walls are respectively communicated with a plurality of airbags 53, as Figure 3 shown, that is, a T-shaped structure is formed after each air duct monomer is communicated with the corresponding airbag 53; of course, the airbag assembly 5 can also adopt other structural distribution forms. For example, the airbag 53 is divided into an upper airbag and a lower airbag, and a cross-shaped structure can be formed after the upper airbag and the lower airbag are respectively communicated with the upper wall and the lower wall of the corresponding air duct monomer.

[0046] Specifically, the side wall of the air duct 51 is used to surround and bond to the outer peripheral wall of the shielding cylinder 3. Among them, as Figure 3As shown, the side wall of the air duct 51 is provided with an adhesive area 54. Among them, the side wall of the air duct 51 can be provided with a strong double-sided adhesive. After tearing off the strong double-sided adhesive, the side wall of the air duct 51 can be surrounded and adhered to the outer peripheral wall of the shielding cylinder 3, so that the surrounding of the airbag assembly 5 on the shielding cylinder 3 is more convenient and easy to operate. Of course, in this solution, after the airbag assembly 5 is surrounded, it is then sleeved into the coil 2.

[0047] Furthermore, the inflation port is provided with a check valve 55. That is to say, the inflation port on the air duct 51 is the inflation port with a check valve 55, so that after the airbag assembly 5 is filled with air, the inflation gun can be directly pulled out without air leakage.

[0048] Still further, the material of the air duct 51 and / or the multiple airbags 53 includes polyethylene. That is to say, the main material of the airbag assembly 5 can be polyethylene PE, which can resist the corrosion of acid, alkali, salt solution and various organic solvents below 50°C, can exist well in the castable, does not react with the castable, will not affect the performance of the castable, and also has a certain pressure resistance and does not absorb water.

[0049] That is to say, the airbag assembly 5 provided by this solution includes: an air duct 51, a safety line 52, airbags 53, an adhesive area 54 and an inflation port with a check valve. These five parts can be made according to the Figure 3 structure shown, and its filling material is air. When filling, it is not only simple to operate, low in cost and easy to operate, but also covered by the castable after filling, has little influence on the contact between the original shielding cylinder 3 and the castable, and can also ensure the fixing stability of the coil 2.

[0050] Among them, after selecting an appropriate length of the air duct 51 according to the diameter of the shielding cylinder 3, the safety line on the outermost side of the air duct 51 is torn off, and then the two ends or one end of the remaining air duct 51 are heat-sealed. The strong double-sided adhesive on the back adhesive area is torn off to bond and fix the air duct 51 on the shielding cylinder 3. After the coil is placed, the airbag assembly is inflated, the inflation gun is directly pulled out after inflation, and finally the casting is carried out.

[0051] In addition, the filling assembly (airbag assembly) of this solution can be customized and mass-produced, and the cost is much lower than that of the polyurethane castable. Its filling material is air, only a pneumatic pump needs to be invested once. The filling volume of the filling assembly accounts for more than one-third of the casting area. After implementation, the existing casting cost is reduced by at least one-third. Moreover, this filling assembly is safe, environmentally friendly and does not affect the product quality, and is applicable to the casting scenarios of current transformers of various voltage levels, and has certain results in reducing the cost of current transformers.

[0052] Certainly, the casting and filling structure for current transformers provided by this solution can be used in other scenarios that require casting and filling. Moreover, the bonding between the shielding cylinder and the coil can also be between other metals and metals, metals and non-metals, or non-metals and non-metals. Therefore, any equivalent replacement or change based on this technical solution and concept should be covered within the protection scope of this utility model.

[0053] An embodiment of this utility model also provides a coil shielding combination structure for a current transformer, as Figure 1 and Figure 2 shown, which includes: a flange 1, a coil 2, a shielding cylinder 3, and a casting and filling structure. The casting and filling structure is the casting and filling structure for current transformers as described above. Since this solution adopts the above-mentioned casting and filling structure for current transformers, it thus has corresponding beneficial effects. For details, reference can be made to the previous description and will not be elaborated here.

[0054] An embodiment of this utility model also provides a current transformer, which includes a coil shielding combination structure. The coil shielding combination structure is the coil shielding combination structure for current transformers as described above. Since this solution adopts the above-mentioned coil shielding combination structure for current transformers, it thus has corresponding beneficial effects. For details, reference can be made to the previous description and will not be elaborated here.

[0055] In this specification, each embodiment is described in a progressive manner. The key point of each embodiment is to illustrate the differences from other embodiments. For the same or similar parts among the embodiments, reference can be made to each other.

[0056] The above description of the disclosed embodiments enables those skilled in the art to implement or use this utility model. Various modifications to these embodiments will be obvious to those skilled in the art. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of this utility model. Therefore, this utility model will not be limited to these embodiments shown herein, but will conform to the broadest scope consistent with the principles and novel features disclosed herein.

Claims

1. A casting filling structure for a current transformer, applied to a coil shielding combined structure of a current transformer, characterized in that: Including filling components and castables; The filling component is used to be arranged in a casting area (4) between the coil (2) and the shielding cylinder (3) of the coil shielding assembly structure; The casting material is used to cast the remaining casting area (4) between the coil (2) and the shielding cylinder (3), and covers the filling component.

2. The pouring filling structure for current transformer according to claim 1, characterized in that: The filling component is used to be distributed around the shielding cylinder (3).

3. The pouring filling structure for current transformer according to claim 2, characterized in that: The filling component comprises an air bag component (5) and is used for filling with air.

4. The pouring filling structure for current transformer according to claim 3, characterized in that: The airbag assembly (5) comprises: an airway (51) and a plurality of airbags (53); The air channel (51) is used to surround the shielding tube (3) and is provided with an air filling port; The plurality of air bags (53) are respectively connected to the air passages (51) and are distributed around the shielding cylinder (3).

5. The pouring filling structure for current transformer according to claim 4, characterized in that: The air channel (51) is evenly divided into multiple air channel monomers along the length direction, each of the multiple air channel monomers can be torn off, and both ends thereof can be heat-sealed, and several of the air channel monomers are provided with the inflation port; The plurality of air bags (53) are connected one by one to the plurality of sections of airway monomers.

6. The pouring filling structure for current transformer according to claim 4, characterized in that: The side walls of the air channel (51) are used to surround and be fixed to the outer peripheral wall of the shielding cylinder (3); the upper wall is provided with the inflation port; and the lower wall is respectively connected to the plurality of air bags (53).

7. The pouring filling structure for current transformer according to claim 6, characterized in that: The side wall of the air channel (51) is used to surround and bond to the outer peripheral wall of the shielding cylinder (3).

8. The pouring filling structure for current transformer according to claim 4, characterized in that: The material of the air channel (51) and / or the plurality of air bags (53) includes polyethylene.

9. A coil shielding combination structure of a current transformer, comprising: A flange (1), a coil (2), a shielding tube (3) and a casting filling structure, wherein the casting filling structure is a casting filling structure for a current transformer as claimed in any one of claims 1 to 8.

10. A current transformer, comprising a coil shielding combination structure, characterized in that: The coil shielding combination structure is the coil shielding combination structure of the current transformer as claimed in claim 9.

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