Low-voltage mutual inductor pouring raw material stirring tank

Abstract

The utility model relates to low -voltage mutual -inductor technical field, concretely relates to a kind of low -voltage mutual -inductor pouring raw material stirring tank, including upper jar body, lower jar body, connecting cover, delivery pump and negative pressure pipeline.Upper jar body is separately arranged with lower jar body and is connected with each other by connecting cover, overflow groove is formed between connecting cover and lower jar body, and triangular weir is arranged on the periphery above lower jar body;The import of delivery pump is connected with the below of lower jar body, and the outlet of delivery pump is communicated with the inside of connecting cover;Negative pressure pipeline is arranged in the side of upper jar body, and negative pressure pipeline is connected with vacuum pump, and discharge pipe is arranged in the bottom of lower jar body.The utility model carries out forced circulation to material in the process of material stirring degassing, on the one hand, it is helpful to the mixing of material, on the other hand, material is laid on the inside wall of lower jar body in a thin layer in the process of circulation, which makes the degassing efficiency of material be accelerated, so that material is more quickly mixed and degassed, and the mixing degassing efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of low-voltage instrument transformer technology, specifically to a mixing tank for casting raw materials of low-voltage instrument transformers. Background Technology

[0002] In the production process of low-voltage instrument transformers, the transformer core is installed into a mold and then formed by casting. The raw materials used in the casting process are epoxy resin and curing agent. In actual production, the epoxy resin and curing agent are mixed and stirred evenly with silicon micropowder and degassed. Then, the mixed and degassed epoxy resin and curing agent are mixed together, and then cured after casting to obtain the low-voltage instrument transformer product. In this process, degassing and silicon micropowder can effectively improve the insulation performance and ensure product quality.

[0003] In the existing mixing and degassing process, the metered epoxy resin or curing agent and silica powder are added to the mixing tank, and the sealing lid is closed. At this time, the mixing and degassing are completed by stirring and drawing negative pressure. After the degassing is completed, the sealing lid is opened, and the finished material is discharged through the discharge pipe at the bottom of the tank and then transferred to the subsequent process.

[0004] The above process requires approximately 2 hours in actual production to ensure degassing and mixing effects. The long processing time is not conducive to improving production efficiency. In addition, due to the negative pressure inside the tank, opening the sealing cover is also quite difficult. Therefore, this utility model proposes a low-pressure transformer casting raw material mixing tank. This process promotes material mixing and degassing through external circulation and overflow spreading, thereby greatly improving mixing and degassing efficiency and bringing convenience to actual production. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of the prior art by providing a low-pressure transformer casting raw material mixing tank to improve mixing and degassing efficiency.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a mixing tank for casting raw materials of a low-voltage transformer, comprising a tank body, a head provided on the top of the tank body, a stirring motor fixedly mounted on the head, the stirring motor being drivenly connected to a stirring paddle inside the tank body, a feed inlet provided on the head, and a sealing cover provided on the feed inlet; the tank body comprises a lower tank body and an upper tank body, the lower tank body and the upper tank body being separately disposed, a connecting cover provided between the lower tank body and the upper tank body, the connecting cover being fixedly and sealingly connected to both the lower tank body and the upper tank body, forming an overflow groove between the connecting cover and the lower tank body; a conveying pump inlet is connected to one side of the lower tank body, and the conveying pump outlet is connected to the interior of the connecting cover; a negative pressure pipe is provided on one side of the upper tank body, and the negative pressure pipe is connected to a vacuum pump; a discharge pipe is provided at the bottom of one side of the lower tank body, and a first control valve is provided on the discharge pipe.

[0007] Furthermore, both the upper and lower tanks are cylindrical, with equal diameters; the connecting cover is annular, with an outer diameter larger than the diameters of the upper and lower tanks; the upper and lower sides of the connecting cover are sealed to the upper and lower tanks respectively by fastening bolts, and sealing gaskets are provided at the connection points between the connecting cover and the upper and lower tanks.

[0008] Furthermore, the inlet of the pump is connected to the bottom of the lower tank via a first conveying pipe, and the outlet of the pump is connected to the inside of the connecting cover via a second conveying pipe; a second control valve is installed on the first conveying pipe, and a flow indicator is installed on the second conveying pipe.

[0009] Furthermore, a third control valve is installed on the negative pressure pipeline.

[0010] Furthermore, a pressure balancing pipe is installed on the negative pressure pipeline between the third control valve and the upper tank, and a fourth control valve is installed on the pressure balancing pipe.

[0011] Furthermore, a triangular weir is provided around the upper perimeter of the lower tank, and the height of the lowest point of the triangular weir is higher than the height of the lowest point of the overflow trough.

[0012] The beneficial effects of this utility model are as follows: During the process of material stirring and degassing, the material is forced to circulate, which helps to mix the material on the one hand, and on the other hand, during the circulation process, the material is spread into a thin layer on the inner wall of the lower tank, which speeds up the degassing efficiency of the material, thereby facilitating faster mixing and degassing of the material and improving the mixing and degassing efficiency. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0014] Figure 2 This is a schematic diagram of the internal structure of the connecting cover of this utility model.

[0015] The names corresponding to each mark in the diagram:

[0016] 1. Tank body; 11. Lower tank body; 111. Discharge pipe; 112. First control valve; 113. Triangular weir; 12. Upper tank body; 121. End cap; 122. Inlet; 13. Connecting cover; 2. Agitator motor; 21. Agitator paddle; 3. Conveying pump; 31. First conveying pipe; 311. Second control valve; 32. Second conveying pipe; 4. Negative pressure pipeline; 41. Third control valve; 5. Air pressure balance pipe; 51. Fourth control valve; 6. Overflow trough. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model are within the protection scope of the present utility model.

[0018] Embodiments of this utility model:

[0019] like Figure 1-2 As shown, in this embodiment, the mixing tank includes a tank body 1, which includes a lower tank body 11 and an upper tank body 12. The lower tank body 11 and the upper tank body 12 are separately disposed, and a connecting cover 13 is provided to connect the lower tank body 11 and the upper tank body 12. In one embodiment of this utility model, both the lower tank body 11 and the upper tank body 12 are cylindrical, and the connecting cover 13 is annular. The upper and lower sides of the connecting cover 13 are respectively sealed and fixedly connected to the lower tank body 11 and the upper tank body 12. In one embodiment of this utility model, the upper and lower sides of the connecting cover 13 are respectively fixedly connected to the lower tank body 11 and the upper tank body 12 by bolts, and a rubber gasket is provided at the connection for sealing.

[0020] In this embodiment, a cap 121 is provided above the upper tank 12, and a stirring motor 2 is fixedly installed on the cap 121. The stirring motor 2 is connected to the stirring paddle 21 in the tank. A feed inlet 122 is provided on the cap 121, and a cover is hinged to the feed inlet 122. The cover and the feed inlet 122 are locked together by a handwheel locking bolt. A sealing ring is provided between the cover and the feed inlet 122. The sealing ring is fixed on the feed inlet 122 by adhesive or other means and is located at the contact surface between the feed inlet 122 and the cover. In this embodiment, the cover, handwheel locking bolt, sealing ring, etc. are existing mature structures and will not be described in detail.

[0021] In this embodiment, a discharge pipe 111 is provided at the bottom of the lower tank 11, and a first control valve 112 is provided on the discharge pipe 111. A conveying pump 3 is also provided on one side of the mixing tank. The inlet of the conveying pump 3 is connected to the first conveying pipe 31, and the other end of the first conveying pipe 31 is connected to the bottom of the lower tank 11. A second control valve 311 is provided on the first conveying pipe 31, and the outlet of the conveying pump 3 is connected to the second conveying pipe 32. The other end of the second conveying pipe 32 is connected to the middle of the connecting cover 13, and a flow indicator is provided on the second conveying pipe 32. In one embodiment of this utility model, the conveying pump 3 is a gear pump, and the flow indicator is a volumetric flow meter.

[0022] In this embodiment, an overflow groove 6 is formed between the inside of the connecting cover 13 and the lower tank 11, and a triangular weir 113 is provided around the upper periphery of the lower tank 11.

[0023] In this embodiment, a negative pressure pipe 4 is provided on one side of the upper tank 12. The negative pressure pipe 4 is connected to a vacuum pump. A third control valve 41 is provided on the negative pressure pipe 4. A pressure balance pipe 5 is provided on the negative pressure pipe 4 at the front end of the third control valve 41 (measured by the airflow direction). A fourth control valve 51 is provided on the pressure balance pipe 5.

[0024] The principle of this utility model is as follows:

[0025] In this invention, because low-voltage instrument transformers are generally small in size and require less raw material for casting, the volume of the mixing tank is also relatively small. In actual production, the volume of the mixing tank is around 0.5 m³. 3 Therefore, manual feeding from the feed inlet 122 is sufficient to meet daily production needs.

[0026] In this invention, the casting materials for the low-voltage transformer include epoxy resin, curing agent, and silicon powder. During the process, silicon powder is added to the epoxy resin and curing agent respectively, and the epoxy resin and curing agent after adding silicon powder are stirred and degassed. The two materials are then mixed at the back end and cast. The back end process involves this process, which will not be described in detail here.

[0027] In this invention, after measuring and adding silicon micro powder and epoxy resin or curing agent into a mixing tank and sealing it, the stirring motor 2 is started to stir the material. During the stirring process, the delivery pump 3 is started to circulate the material in the tank 1, and the vacuum pump is started to extract air through the negative pressure pipe 4. During this circulation, the material flows from top to bottom on the inner wall of the lower tank 11 through the overflow trough 6 and the triangular weir 113 above the lower tank 11, which is equivalent to spreading the material into a thin layer. This is more conducive to the degassing of the material, and the circulation of the material also promotes the dispersion of silicon micro powder. In practical applications, it has been found that the conventional degassing and stirring method takes about 2 hours, while the stirring and degassing time can be shortened to 30 minutes using this invention, which can meet production requirements. It should be noted that although silicon micro powder is a solid powder, its particle size is small, with a commonly used particle size of 800-1000 mesh, which does not affect the normal operation of the delivery pump 3.

[0028] After the stirring and degassing are completed, stop stirring, conveying pump 3, and vacuum pump, etc. At this time, close the third control valve 41 and open the fourth control valve 51 (which is easier than opening the sealing cover). This achieves pressure balance in tank 1. Open the first control valve 112 to discharge the material in tank 1 into the carrying bucket, and then transfer it to the production line at the back end. It should be noted that although air is introduced into tank 1 through the pressure balance pipe 5 after stirring and degassing, and the surface of the material will also come into contact with air during the transfer of the carrying bucket, the contact time is short and does not affect the quality of the product. In addition, the second control valve 311 can be used for maintenance of conveying pump 3, etc., and is basically kept open in actual production.

Claims

1. A low-voltage transformer pouring raw material stirring tank, comprising a tank body, a cover is arranged above the tank body, a stirring motor is fixedly arranged on the cover, the stirring motor is in transmission connection with a stirring paddle in the tank body, a feeding port is arranged on the cover, and a sealing cover is arranged on the feeding port, characterized in that: The tank body includes a lower tank and an upper tank, which are separately arranged. A connecting cover is provided between the lower tank and the upper tank, and the connecting cover is fixedly and sealed to both the lower tank and the upper tank, forming an overflow groove between the connecting cover and the lower tank. The inlet of a conveying pump is connected to one side of the lower tank, and the outlet of the conveying pump is connected to the inside of the connecting cover. A negative pressure pipe is provided on one side of the upper tank, and the negative pressure pipe is connected to a vacuum pump. A discharge pipe is provided at the bottom of one side of the lower tank, and a first control valve is provided on the discharge pipe. ​ 2. The low voltage transformer pouring raw material stirring tank according to claim 1, characterized in that: Both the upper and lower tanks are cylindrical, with equal diameters. The connecting cover is annular, with an outer diameter larger than that of the upper and lower tanks. The upper and lower sides of the connecting cover are sealed to the upper and lower tanks respectively by fastening bolts, and sealing gaskets are provided at the connection points between the connecting cover and the upper and lower tanks.

3. The low voltage transformer pouring raw material stirring tank according to claim 1, characterized in that: The inlet of the pump is connected to the bottom of the lower tank through a first conveying pipe, and the outlet of the pump is connected to the inside of the connecting cover through a second conveying pipe. A second control valve is installed on the first conveying pipe, and a flow indicator is installed on the second conveying pipe.

4. The low voltage transformer pouring raw material stirring tank according to claim 1, characterized in that: A third control valve is installed on the negative pressure pipeline.

5. A mixing tank for casting raw materials of a low-voltage instrument transformer according to claim 4, characterized in that: A pressure balancing pipe is installed on the negative pressure pipeline between the third control valve and the upper tank, and a fourth control valve is installed on the pressure balancing pipe.

6. The low-voltage transformer casting raw material mixing tank according to claim 1, characterized in that: A triangular weir is provided around the upper perimeter of the lower tank, and the height of the lowest point of the triangular weir is higher than the height of the lowest point of the overflow trough.

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