Capacitor glue filling device based on connected vessel principle and method thereof

Abstract

The application provides a capacitor glue filling device based on the principle of connected vessels and a method thereof, comprising a vacuum box, a temporary storage bucket and capacitors to be filled with glue; the temporary storage bucket and the capacitors to be filled with glue are placed in the vacuum box; the temporary storage bucket is arranged on one side of the capacitors to be filled with glue; the bottom end of the temporary storage bucket is higher than the top end of the capacitors; the temporary storage bucket is upwardly open; the temporary storage bucket is connected with the capacitors through a self-flowing pipeline; one end of the self-flowing pipeline is arranged at the bottom end of the temporary storage bucket, and the other end is arranged at the bottom of the capacitors; a material body is arranged in the temporary storage bucket; the material body enters the capacitors through the self-flowing pipeline under the action of gravity; and the vacuum box is used for realizing the function of vacuumizing. The material body entering the capacitors does not contain bubbles and can fill all cavities in the capacitors.

Description

Technical Field

[0001] This invention belongs to the field of capacitor casting technology, specifically relating to a capacitor potting device and method based on the principle of communicating vessels. Background Technology

[0002] Capacitors are produced by welding a large number of cylindrical capacitor elements in a specific arrangement, wrapping them with outer insulating layers, and then placing them in a sealed stainless steel shell. All other cavities within the stainless steel shell must be filled with insulating material to ensure insulation performance and mechanical stability. Because capacitors have a high energy density and very compact internal element arrangement, the flow channels are narrow (1mm thick) and long (1000mm long), and there are many of these long, narrow channels. In existing technologies, the preparation process of the potting compound inevitably results in air bubbles in the compound; furthermore, the potting compound enters the capacitor directly from the top inlet, leading to some unfilled cavities after potting due to the capacitor's unique internal structure. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the aforementioned background technology and provide a capacitor potting device and method based on the principle of communicating vessels, so that the material entering the capacitor does not contain air bubbles and can fill all the cavities inside the capacitor.

[0004] The technical solution adopted in this invention is: a capacitor potting device based on the principle of communicating vessels, comprising a vacuum box, a temporary storage container, and a capacitor to be potted; both the temporary storage container and the capacitor to be potted are placed inside the vacuum box; the temporary storage container is positioned on one side of the capacitor to be potted; the bottom of the temporary storage container is higher than the top of the capacitor; the temporary storage container has an upward opening; the temporary storage container is connected to the capacitor via a self-flowing pipe; one end of the self-flowing pipe is located at the bottom of the temporary storage container, and the other end is located at the bottom of the capacitor; the temporary storage container contains a material; the material enters the capacitor through the self-flowing pipe under the action of gravity; the vacuum box is used to achieve a vacuuming function.

[0005] In the above technical solution, the bottom of the temporary storage bucket is an inverted conical structure.

[0006] The above technical solution also includes an exhaust pipe; one end of the exhaust pipe is connected to the connection between the temporary storage tank and the self-flowing pipe; the other end is connected to the inside of the vacuum box.

[0007] In the above technical solution, the bottom end of the temporary storage tank extends downward to form a discharge end; the discharge end is connected to the self-flowing pipe, and an electric valve is provided on the discharge end; the electric valve is used to control the material flow rate and the connection status between the temporary storage tank and the self-flowing pipe.

[0008] The above technical solution also includes a first liquid level display pipe; the bottom end of the first liquid level display pipe is connected to the connection between the capacitor and the self-flowing pipe, and the top end of the first liquid level display pipe is connected to the inside of the vacuum chamber; the extension direction of the first liquid level display pipe is parallel to the axial direction of the capacitor; the top end of the first liquid level display pipe is higher than the top end of the capacitor; the first liquid level display pipe is a transparent pipe.

[0009] The above technical solution also includes a second liquid level display pipe; the bottom end of the second liquid level display pipe is connected to the capacitor and the top end, and the top end of the second liquid level display pipe is connected to the inside of the vacuum chamber; the top end of the second liquid level display pipe is higher than the top end of the capacitor; the second liquid level display pipe is a transparent pipe.

[0010] In the above technical solution, the capacitor is placed at an angle; the second liquid level display pipe is located on the higher side of the top of the capacitor.

[0011] The above technical solution also includes a support frame; the temporary storage bucket is supported on the top of the support frame.

[0012] The above technical solution also includes a movable platform; the support frame is vertically fixed to the surface of the movable platform; the movable platform is provided with pads; the capacitor is placed on the surface of the movable platform; the side of the capacitor closest to the temporary storage tank is supported on the surface of the movable platform, and the other side is supported on the pads.

[0013] The glue-filling method of the capacitor glue-filling device based on the principle of communicating vessels includes the following steps: After the temporary storage tank containing the material is placed in the vacuum chamber, the vacuum chamber is evacuated with the electric valve closed, and the air bubbles in the material in the temporary storage tank are discharged through the upward opening of the temporary storage tank; then the electric valve is opened and the vacuum chamber is evacuated, allowing the material to enter the capacitor through the self-flowing pipe; the remaining air bubbles in the material are discharged through the exhaust pipe; when the material levels in the self-flowing pipe, the first liquid level display pipe, and the second liquid level display pipe are consistent, the capacitor is glue-filled and the inside of the capacitor is filled with the material.

[0014] The beneficial effects of this invention are as follows: A communicating vessel structure is constructed through the connection of the temporary storage tank, the self-flowing pipe, and the capacitor. A height difference is formed between the temporary storage tank and the capacitor, allowing the material to flow by gravity, effectively entering the capacitor and automatically realizing the potting process. The vacuum chamber's vacuuming function interacts with the upward-opening temporary storage tank, expelling air bubbles from the material and achieving bubble-free casting. The opening at the top of the temporary storage tank ensures full contact between the casting material and the vacuum environment, enabling rapid vacuuming. The electric valve at the bottom of the temporary storage tank controls the material flow rate, preventing excessive discharge speed and blockage of the capacitor's inlet and outlet. An exhaust pipe on the self-flowing pipe facilitates further vacuum-breaking of tiny air bubbles hidden at the bottom of the temporary storage tank. The communicating vessel structure formed by the self-flowing pipe, the first liquid level display pipe, and the second liquid level display pipe allows for visual observation of the liquid level in the capacitor, providing a visually identifiable basis for determining full capacitor casting under vacuum conditions. By placing the capacitor at an angle, the material can always flow in from one side, while the other side has an exhaust airflow channel when there is no material filling, allowing the material to effectively enter the gap in the capacitor. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0016] Figure 2 This is a schematic diagram of the temporary storage bucket of the present invention;

[0017] Figure 3 This is a schematic diagram of a self-flowing conduit with an exhaust pipe according to the present invention;

[0018] Figure 4 This is a partial schematic diagram of the present invention;

[0019] Figure 5 This is a partial schematic diagram b of the present invention;

[0020] Figure 6 This is a schematic diagram of the liquid level difference in the pipeline when the pouring of the present invention is completed.

[0021] Among them, 1-vacuum box, 2-temporary storage tank, 3-support frame, 4-electric valve, 5-first tee, 6-moving platform, 7-second tee, 8-pad, 9-capacitor, 10-second liquid level display pipe, 11-first liquid level display pipe, 12-self-flowing pipe, 13-exhaust pipe, 14-support component, 15-handle. Detailed Implementation

[0022] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments to facilitate a clear understanding of the present invention, but these descriptions do not constitute a limitation on the present invention.

[0023] like Figure 1 As shown, this invention discloses a capacitor potting device based on the principle of communicating vessels, comprising a vacuum chamber 1, a temporary storage container 2, and a capacitor 9 to be potted; both the temporary storage container 2 and the capacitor 9 to be potted are placed inside the vacuum chamber 1; the temporary storage container 2 is positioned on one side of the capacitor 9 to be potted; the bottom of the temporary storage container 2 is higher than the top of the capacitor 9; the temporary storage container 2 has an upward opening; the temporary storage container 2 is connected to the capacitor 9 via a self-flowing pipe 12; one end of the self-flowing pipe 12 is located at the bottom of the temporary storage container 2, and the other end is located at the bottom of the capacitor 9; the temporary storage container 2 contains a material; the material enters the capacitor 9 through the self-flowing pipe 12 under the action of gravity; the vacuum chamber 1 is used to achieve a vacuum function. It also includes a support frame 3; the temporary storage container 2 is supported on the top of the support frame 3.

[0024] Specifically, the upper part of the temporary storage tank 2 is a cylindrical structure, and the lower part is an inverted conical structure, allowing the material to flow smoothly down the tank wall. A height difference is formed between the temporary storage tank 2 and the capacitor 9, allowing the material to flow by gravity. The top of the temporary storage tank 2 is open, ensuring that the material to be poured is in full contact with the vacuum environment in the vacuum chamber 1, achieving rapid vacuuming.

[0025] like Figure 2 As shown, the bottom outer surface of the cylindrical structure of the temporary storage container 2 is provided with a support member 14 that cooperates with the support frame 3. By placing the support member 14 on the top of the support frame 3, the support frame 3 supports the temporary storage container 2. The bottom outer surface of the cylindrical structure of the temporary storage container 2 is provided with a handle 15 to facilitate the transfer of the temporary storage container 2.

[0026] like Figure 3 As shown, it also includes an exhaust pipe 13; one end of the exhaust pipe 13 is connected to the connection between the temporary storage tank 2 and the self-flowing pipe 12; the other end is connected to the inside of the vacuum box 1, which facilitates further vacuum breaking of the tiny bubbles hidden at the bottom of the temporary storage tank 2.

[0027] The bottom end of the temporary storage tank 2 extends downward to form a discharge end; it also includes a first three-way valve 5; the three ports of the first three-way valve 5 are respectively connected to the discharge end, the self-flowing pipe 12, and the exhaust pipe 13. An electric valve 4 is installed on the discharge end; the electric valve 4 is used to control the material flow rate and the connection status between the temporary storage tank 2 and the self-flowing pipe 12. The electric valve 4 is located above the first three-way valve 5. The exhaust pipe 13 is located on one side of the first three-way valve 5 to facilitate gas discharge.

[0028] like Figure 4As shown, it also includes a first liquid level display pipe 11; the bottom end of the first liquid level display pipe 11 is connected to the connection between the capacitor 9 and the self-flowing pipe 12, and the top end of the first liquid level display pipe 11 is connected to the inside of the vacuum box 1; the extension direction of the first liquid level display pipe 11 is parallel to the axial direction of the capacitor 9; the top end of the first liquid level display pipe 11 is higher than the top end of the capacitor 9; the first liquid level display pipe 11 and the self-flowing pipe 12 are transparent pipes.

[0029] Specifically, it also includes a second three-way connector 7, whose three ports are respectively connected to the self-flowing pipe 12, the first liquid level display pipe 11, and the capacitor 9. The bottom opening of the capacitor 9 is connected to the second three-way connector 7 as the inlet of the capacitor 9; the position of the inlet is set according to the specific requirements such as the site environment.

[0030] Specifically, it also includes a second liquid level display pipe 10; the bottom end of the second liquid level display pipe 10 is connected to the top of the capacitor 9, and the top end of the second liquid level display pipe 10 is connected to the inside of the vacuum chamber 1; the top end of the second liquid level display pipe 10 is higher than the top end of the capacitor 9; the second liquid level display pipe 10 is a transparent pipe. When the capacitor 9 is fully filled, the material can overflow from the second liquid level display pipe 10, thus indicating that full filling has been achieved.

[0031] The capacitor 9 is housed in a sealed stainless steel enclosure, making it impossible to observe the liquid level during pouring and determine if it is fully filled. Furthermore, the entire pouring process is completed within the vacuum chamber 1, which is inaccessible to the operator. Using the principle of communicating vessels, the operator observes the first liquid level display pipe 11 and the second liquid level display pipe 10 through an observation window outside the vacuum chamber 1 to determine if they are level and not descending, thus confirming full filling.

[0032] like Figure 5 As shown, it also includes a movable platform 6; the support frame 3 is vertically fixed to the surface of the movable platform 6; the movable platform 6 is provided with a pad 8; the capacitor 9 is placed on the surface of the movable platform 6; the side of the capacitor 9 closest to the temporary storage tank 2 is supported on the surface of the movable platform 6, and the other side is supported on the pad 8. The capacitor 9 is placed at an angle; the second liquid level display pipe 10 is located on the higher side of the top of the capacitor 9.

[0033] Because the flow gaps in the longitudinal direction of capacitor 9 are fine and narrow, while the flow in the lateral direction is almost unimpeded, if the tilt angle is 90 degrees, the lateral flow space is small, easily resulting in the lateral direction being completely filled while a large number of gaps in the longitudinal direction remain unfilled. Without an airflow channel, it is difficult to completely expel air from the bottom, making it difficult to achieve bubble-free casting. If the tilt angle is 0 degrees, the adhesive has almost no fluidity in the longitudinal direction of capacitor 9, also easily resulting in the lateral direction being completely filled while a large number of gaps in the longitudinal direction remain unfilled. Based on repeated calculations, in this embodiment, setting the tilt angle to 55 degrees solves the above problems and achieves bubble-free casting.

[0034] Specifically, the bottom of the movable platform 6 is equipped with casters, which makes it easy for the operator to push the movable platform 6 out or into the vacuum box 1 to place and retrieve the temporary storage bucket 2 and the capacitor 9.

[0035] This invention also provides a glue-potting method for a capacitor 9 glue-potting device based on the principle of communicating vessels, specifically including the following steps:

[0036] Mix the two types of castable refractory, A and B, according to the specified ratio. After mixing, pour the mixture into the temporary storage tank 2. Place the temporary storage tank 2 containing the mixture on the support frame 3 and raise the height of the temporary storage tank 2. Push the movable platform 6, which contains the capacitor 9 and the temporary storage tank 2, into the vacuum chamber 1.

[0037] After the temporary storage container 2 containing the material is placed in the vacuum chamber 1, the vacuum chamber 1 is closed. With the electric valve 4 closed, the vacuum chamber 1 performs a vacuuming operation for a period of time to remove air bubbles from the material in the temporary storage container 2.

[0038] After the entire vacuum chamber 1 is evacuated, the electric valve 4 is opened and the vacuum chamber 1 continues to perform the evacuation operation, allowing the material to enter the capacitor 9 through the self-flowing pipe 12; the remaining air bubbles in the material are discharged through the exhaust pipe 13, so that the tiny air bubbles hidden in the material at the bottom of the temporary storage tank 2 are further discharged.

[0039] like Figure 6 As shown, when the material levels in the self-flowing pipe 12, the first liquid level display pipe 11, and the second liquid level display pipe 10 are consistent, the capacitor 9 has completed the filling process and is filled with material. If the outlet pipe drops, it indicates that material replenishment has occurred and the capacitor 9 is not fully filled. Only when the liquid levels are equal and there is no further drop in the outlet liquid level does it indicate that all cavities inside the capacitor 9 have been filled with material.

[0040] This invention proposes a capacitor casting process that combines static casting, a low vacuum environment (≤100Pa), and a low-viscosity material (viscosity ≤3000mpa·s) to achieve low partial discharge casting of dry capacitors. After internal curing, the partial discharge is <5pC, which is significantly reduced after curing compared with traditional structural design and casting methods.

[0041] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

Claims

1. A capacitor potting device based on the principle of communicating vessels, characterized in that: The system includes a vacuum chamber, a temporary storage container, and a capacitor to be filled with adhesive. Both the temporary storage container and the capacitor are placed inside the vacuum chamber. The temporary storage container is positioned to one side of the capacitor. The bottom of the temporary storage container is higher than the top of the capacitor. The temporary storage container opens upwards. The temporary storage container is connected to the capacitor via a self-flowing pipe. One end of the self-flowing pipe is located at the bottom of the temporary storage container, and the other end is located at the bottom of the capacitor. The temporary storage container contains a material. The material enters the capacitor through the self-flowing pipe under gravity. The vacuum chamber is used to achieve a vacuum function. It also includes a first liquid level display pipe and a second liquid level display pipe; The bottom end of the first liquid level display pipe is connected to the connection between the capacitor and the self-flowing pipe, and the top end of the first liquid level display pipe is connected to the inside of the vacuum chamber; the extension direction of the first liquid level display pipe is parallel to the axial direction of the capacitor; the top end of the first liquid level display pipe is higher than the top end of the capacitor; the first liquid level display pipe is a transparent pipe. The bottom end of the second liquid level display pipe is connected to the top of the capacitor, and the top end of the second liquid level display pipe is connected to the inside of the vacuum chamber; the top end of the second liquid level display pipe is higher than the top end of the capacitor; the second liquid level display pipe is a transparent pipe. When the material levels in the self-flowing pipe, the first liquid level display pipe, and the second liquid level display pipe are consistent, the capacitor is determined to have completed potting. The bottom of the temporary storage tank extends downward to form a discharge end; the discharge end is connected to the self-flowing pipe, and an electric valve is installed on the discharge end; the electric valve is used to control the flow rate of the material and the connection status between the temporary storage tank and the self-flowing pipe.

2. The capacitor potting device based on the principle of communicating vessels according to claim 1, characterized in that: The bottom of the temporary storage bucket is an inverted cone-shaped structure.

3. The capacitor potting device based on the principle of communicating vessels according to claim 2, characterized in that: It also includes an exhaust pipe; one end of the exhaust pipe is connected to the connection between the temporary storage tank and the self-flowing pipe; the other end is connected to the inside of the vacuum chamber.

4. The capacitor potting device based on the principle of communicating vessels according to claim 1, characterized in that: The capacitor is placed at an angle; the second liquid level display pipe is located on the higher side of the top of the capacitor.

5. A capacitor potting device based on the principle of communicating vessels according to claim 4, characterized in that: It also includes a support frame; the temporary storage bucket is supported on the top of the support frame.

6. A capacitor potting device based on the principle of communicating vessels according to claim 5, characterized in that: It also includes a movable platform; the support frame is vertically fixed to the surface of the movable platform; the movable platform is provided with pads; the capacitor is placed on the surface of the movable platform; the side of the capacitor closest to the temporary storage tank is supported on the surface of the movable platform, and the other side is supported on the pads.

7. A method for dispensing capacitors using a dispensing device based on the principle of communicating vessels according to any one of claims 1-6, characterized in that: Includes the following steps: After the temporary storage container containing the material is placed in the vacuum chamber, the vacuum chamber is evacuated with the electric valve closed, and air bubbles in the material in the temporary storage container are discharged through the upward opening of the temporary storage container. Then, the electric valve is opened and the vacuum chamber is evacuated, allowing the material to enter the capacitor through the self-flowing pipe. The remaining air bubbles in the material are discharged through the exhaust pipe. When the material levels in the self-flowing pipe, the first liquid level display pipe, and the second liquid level display pipe are consistent, the capacitor is filled with glue and its interior is full of material.

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