Mutual inductor micro-positive pressure gel curing device and process thereof

Abstract

The invention provides a mutual inductor micro-positive pressure gel curing device and a process thereof, and relates to the field of mutual inductor production.The device is characterized in that a material storage cup and a pouring mold are connected through a pipeline, the material storage cup is connected to a gas storage tank through a gas conveying pipe, and a starting adjusting valve with a hand wheel is installed on a gas path between the material storage cup and the gas storage tank; the upper end of the material storage cup is sealed by a quick assembly and disassembly sealing cover, and a pressure gauge is installed on the gas storage tank. In the pouring body gel curing process, air pressure is applied to the resin liquid level of the pouring body, so that bubbles on the upper surface of the pouring body can be effectively discharged, all insulation parts of a product can be perfectly filled with the resin pouring material, the product partial discharge qualification rate is effectively increased, the surface attractiveness of the pouring body is improved, and the product quality is improved. Therefore, reliability and appearance quality of the mutual inductor are improved, and safe operation of equipment is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of current transformer manufacturing technology. Background Technology

[0002] Vacuum casting of instrument transformers can remove most of the gaseous impurities inside the epoxy resin, improving the insulation performance of the transformer. However, after the vacuum casting process, some tiny air bubbles will remain on the surface of the transformer casting body. Although these tiny air bubbles have little impact on the electrical performance of the product, they do cause poor appearance of the product. Summary of the Invention

[0003] To address the problems mentioned in the background art, the present invention provides a micro-positive pressure gel curing device for current transformers and its process.

[0004] The technical solution adopted by the present invention to achieve the above objectives is: a micro positive pressure gel curing device for current transformers, wherein the storage cup and the casting mold are connected by a pipeline, the storage cup is connected to the gas storage tank through a gas supply pipe, a regulating valve with a handwheel is installed on the gas line between the storage cup and the gas storage tank, the upper end of the storage cup is sealed by a quick-release sealing cap, and a pressure gauge is installed on the gas storage tank.

[0005] Preferably, an O-ring is installed inside the quick-release sealing cap, and the quick-release sealing cap is fastened to the storage cup by a fastening latch.

[0006] Preferably, the gas storage tank is connected to 2-4 branch gas supply pipes, which can supply gas to 2-4 casting molds at the same time.

[0007] Preferably, the storage cup and the casting mold are connected by a straight pipe.

[0008] The adjustable micro-positive pressure gel curing process for the current transformer involves first connecting the gas storage tank to the gas supply pipe in the initial state. After the vacuum casting of the current transformer is released, slowly add material along the inner wall of the storage cup until the epoxy resin liquid level reaches about 3 / 4 of the storage cup. Then, seal the storage cup with a quick-release sealing cap, connect the gas line with a quick connector, and then open the regulating valve with a handwheel to supply compressed gas from the gas storage tank into the gas line. Control the gas pressure in the gas line between 2kPa and 200kPa according to the pressure gauge reading.

[0009] Preferably, the pressure range of the compressed gas supplied from the gas storage tank to the gas circuit is controlled between 60 kPa and 180 kPa.

[0010] The technical effect of this invention is that by applying air pressure to the resin liquid surface of the casting body during the gel curing process, air bubbles on the upper surface of the casting body can be effectively discharged. As the air bubbles are discharged, the resin casting material can perfectly fill all the insulation points of the product, effectively improving the partial discharge qualification rate of the product and improving the surface aesthetics of the casting body, thereby improving the reliability and appearance quality of the transformer and ensuring the safe operation of the equipment. Attached Figure Description

[0011] Figure 1 This is a structural diagram of the main body of the present invention.

[0012] The markings in the diagram are: 1. Adjustable valve with handwheel start; 2. Gas supply pipe; 3. Pressure gauge; 4. Gas tank; 5. Quick-connect coupling; 6. Quick-release sealing cap; 7. Storage cup; 8. Straight pipe; 9. Casting body; 10. O-ring seal; 11. Loading and unloading latch; 12. Insulation layer; 13. Casting mold. Detailed Implementation

[0013] The present invention will be further explained and described below with reference to the accompanying drawings and embodiments.

[0014] like Figure 1 As shown, in the current transformer micro-positive pressure gel curing device of the present invention, the storage cup 7 and the casting mold 13 are connected by a straight pipe 8. The straight pipe 8 is wrapped with a heat insulation layer 12, which is usually a silicone sponge insulation layer. The storage cup 7 is connected to the gas storage tank 4 through a gas supply pipe 2. The gas supply pipe 2 can be set to 2-4 lines to supply gas to 2-4 casting molds 13 at the same time. A regulating valve 1 with a handwheel is installed on the gas line between the storage cup 7 and the gas storage tank 4. An O-ring 10 is installed in the quick-release sealing cover 6. The quick-release sealing cover 6 seals the upper end of the storage cup 7 by a lock 11. A pressure gauge 3 is installed on the gas storage tank 4.

[0015] In the adjustable micro-positive pressure gel curing process of the current transformer, the gas storage tank 4 is connected to the gas supply pipe 2 in the initial state. After the vacuum casting of the current transformer is released, the resin liquid level drops to 1 / 2-1 / 3 of the volume of the storage cup. At this time, the material is slowly added along the inner wall of the storage cup 7 so that the epoxy resin liquid level reaches about 3 / 4 of the storage cup 7. Then, the storage cup 7 is sealed with the quick-release sealing cap 6, and the gas line is connected with the quick connector 5. Then, the regulating valve 1 with the handwheel is opened to supply compressed gas from the gas storage tank 4 into the gas line. The gas pressure in the gas line is controlled between 60kPa and 180kPa according to the value of the pressure gauge 3.

[0016] During operation, the air pressure in the entire air circuit is adjusted by starting the regulating valve 1 with a handwheel, so that the compressed gas acts on the surface of the resin liquid in the storage cup 7, keeping the resin liquid surface in a slightly positive pressure state until the casting body 9 is cured.

[0017] This invention has been described through embodiments. Those skilled in the art will understand that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of the invention. Furthermore, under the teachings of this invention, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of the invention. Therefore, this invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of this invention.

Claims

1. A micro-positive pressure gel curing device for a current transformer, characterized in that: The storage cup (7) and the casting mold (13) are connected by a pipeline. The storage cup (7) is connected to the gas tank (4) through the gas supply pipe (2). A regulating valve (1) with a handwheel is installed on the gas line between the storage cup (7) and the gas tank (4). A quick-release sealing cap (6) is installed on the upper end of the storage cup (7). A pressure gauge (3) is installed on the gas tank (4). The gas tank (4) is connected to the gas supply pipe (2) with 2-4 branches.

2. The transformer micro-positive pressure gel curing device according to claim 1, characterized in that: The quick-release sealing cover (6) is equipped with an O-ring (10), and the quick-release sealing cover (6) is fastened to the storage cup (7) by the loading and unloading lock (11).

3. The transformer micro-positive pressure gel curing device according to claim 1, characterized in that: The storage cup (7) and the casting mold (13) are connected by a straight pipe (8).

4. The transformer micro-positive pressure gel curing process of the transformer micro-positive pressure gel curing device according to claim 1, characterized in that: In the initial state, first connect the gas storage tank (4) to the gas supply pipe (2); after the vacuum casting of the current transformer is released, slowly add material along the inner wall of the storage cup (7) so that the epoxy resin liquid level reaches 3 / 4 of the storage cup (7); then seal the storage cup (7) with the quick-release sealing cap (6), then connect the gas circuit with the quick-connect connector (5), then open the start regulating valve (1) with the handwheel, and supply compressed gas from the gas storage tank (4) to the gas circuit. Control the gas pressure in the gas circuit between 2kPa and 200kPa according to the value of the pressure gauge (3).

5. The current transformer micro-positive pressure gel curing process according to claim 4, characterized in that: The gas pressure of the gas storage tank (4) supplied to the gas circuit is controlled between 60 kPa and 180 kPa.

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