Capacitor element impregnation system and impregnation method
By optimizing the capacitor element impregnation system and method, the problem of incomplete impregnation inside the elements was solved, improving production efficiency and capacitor performance. It also achieved full penetration of electrolyte and effective gas discharge, meeting the high-efficiency production requirements of capacitors.
Patent Information
- Application Number
- CN202511511525.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-22
- Publication Date
- 2026-02-06
AI Technical Summary
In existing capacitor impregnation processes, the difficulty of impregnating the internal material of the element differs in the early and late stages of impregnation. This leads to the need to extend the impregnation time in traditional processes to ensure thorough penetration, which affects production efficiency. Furthermore, the gas resistance in the positive foil pores is high, making it difficult for the electrolyte to fully penetrate.
A capacitor element impregnation system and method are adopted, which uses a combination of vacuum pump, pressurizing pump and control valve to adjust the holding time and frequency-pressure cycle of impregnation cycle, and combined with liquid level and pressure sensor monitoring to optimize the impregnation process. In particular, the holding time is extended in the early stage of impregnation and frequency-pressure cycle is performed in the later stage to enhance the fluidity of electrolyte.
This improved the penetration of the capacitor elements, reduced the DF value, increased production efficiency, ensured that the electrolyte fully penetrated into the elements, reduced the amount of gas in the positive foil pores, and improved the performance and lifespan of the capacitor.
Smart Images
Figure CN121483885A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of capacitor production, and in particular to a capacitor element impregnation system and an impregnation method. BACKGROUND
[0002] Aluminum electrolytic capacitors are widely used in electronic products and household appliances due to their high capacitance, good voltage stability, strong current handling capacity, small size, long service life and other advantages. As the true cathode material of aluminum electrolytic capacitors, electrolyte can not only increase the capacity of aluminum electrolytic capacitors in cooperation with positive foil, but also repair the oxide film on the positive foil during the use of aluminum electrolytic capacitors, realizing self-repairing function. In the production process, electrolyte needs to be injected into the element through impregnation process to make the electrolyte fully penetrate into the internal materials of the element. If the electrolyte does not fully soak the element, it will cause the DF value of the aluminum electrolytic capacitor to be high, the capacitance to be small, and affect the service life and performance of the capacitor.
[0003] In the impregnation process, the amount of gas in the impregnation cylinder and the element is mainly reduced by vacuum pumping. After the negative pressure state is formed in the impregnation cylinder, the electrolyte is sucked in, and then the hydraulic pressure of the electrolyte in the cylinder is increased by the pressure pump to realize the thorough impregnation of the element. In the current impregnation process, the pressure maintaining phase for maintaining the hydraulic pressure is often consistent in the proportion of the single cycle time from the initial cycle to the end of the cycle. In the initial stage of impregnation, the aluminum foil and electrolytic paper in the element absorb a small amount of electrolyte and do not experience pressure, so the mutual adhesion is less and the internal element is easy to soak. After several cycles of pressure, the amount of absorbed electrolyte increases, the external hydraulic pressure is high, which causes the mutual adhesion of the internal materials of the element, and the difficulty of electrolyte soaking into the internal element increases. The impregnation pressure maintaining time remains unchanged from the initial stage to the end, which easily causes the aluminum foil in the element to be not thoroughly soaked. There is still a certain amount of gas in the positive foil hole, which forms a large resistance when the electrolyte is soaked into the small holes of the positive foil, so that the electrolyte cannot completely soak into the positive foil hole, causing the DF value to increase. In order to solve the above problems, it is necessary to prolong the impregnation time, which reduces the impregnation efficiency in the production process. SUMMARY
[0004] The first object of the present application is to provide a capacitor element impregnation system.
[0005] The second object of the present application is to provide a capacitor element impregnation method.
[0006] The first object of the present application is implemented by a capacitor element impregnation system, comprising a vacuum tank, a vacuum pump, a liquid storage tank, an impregnation jar, a pressurizing pump, an outlet of the vacuum pump being communicated with an inlet of the vacuum tank, a top of the impregnation jar being communicated with the inlet of the vacuum pump through a first pipeline, a first control valve being installed on the first pipeline, a buffer tank being arranged inside a top end of the liquid storage tank, the top of the impregnation jar being communicated with an inlet of the buffer tank through a second pipeline, a second control valve being installed at an inlet end of the second pipeline, a fourth control valve being installed at an outlet end of the second pipeline, a venting pipe being communicated with the top of the second pipeline, a fifth control valve being installed on the venting pipe, an outlet of the liquid storage tank being communicated with an inlet of the pressurizing pump, an outlet of the pressurizing pump being communicated with a bottom of the impregnation jar, a third control valve being arranged at the outlet side of the pressurizing pump, the inlet of the vacuum pump being communicated with the top of the liquid storage tank and the top of the buffer tank through a third pipeline and a fourth pipeline respectively, a sixth control valve and an eighth control valve being installed on the third pipeline and the fourth pipeline respectively, a liquid discharge pipe being communicated with a bottom end of the buffer tank, a seventh control valve being installed on the liquid discharge pipe, a fifth pipeline being communicated between the bottom of the impregnation jar and the bottom of the liquid storage tank, a ninth control valve being installed on the fifth pipeline, a first liquid level sensor and a pressure sensor being arranged at an upper portion of the impregnation jar, a second liquid level sensor being installed at the outlet end of the second pipeline.
[0007] The second object of the present application is implemented by a capacitor element impregnation method, comprising the following steps: S1 element into jar The element is loaded into the impregnation jar below the first liquid level sensor, and the first to ninth control valves are kept in a closed state; S2 vacuumizing The first control valve is opened and the vacuum pump is started, the impregnation jar is vacuumized through the first pipeline, the vacuum degree is-0.098Mpa, after 1000s of vacuumizing, the first control valve is closed and the vacuum pump is stopped; S3 first liquid loading The third control valve is opened and the pressurizing pump is started, the electrolyte in the liquid storage tank is pumped to the impregnation jar through the pressurizing pump until the liquid level in the impregnation jar reaches the first liquid level sensor, then the third control valve and the pressurizing pump are closed; S4 impregnation circulation The electrolyte in the impregnation jar and the liquid storage tank is subjected to 5-n times of impregnation circulation, then the liquid level in the impregnation jar is controlled to be at the position of the first liquid level sensor; S5 backflow liquid removal Open the second control valve, the fifth control valve, the sixth control valve, and vacuumize the liquid storage tank through the third pipeline until the electrolyte in the impregnation cylinder flows back to the liquid storage tank, and then the impregnation cylinder starts the liquid removal mode, and the electrolyte on the surface of the element is removed at a speed of 550 r / min for 300 s, and the electrolyte is returned to the liquid storage tank through the second pipeline.
[0008] Further, the S4 impregnation cycle process is as follows: S4-1 vacuum keeping Open the first control valve and start the vacuum pump to continue vacuumizing the impregnation cylinder, the vacuum degree is-0.098 Mpa, and the keeping time is 800 s, and then the first control valve is closed; S4-2 secondary liquid feeding Open the second control valve, the third control valve, the fourth control valve and the eighth control valve, and start the pressure pump, vacuumize the buffer tank through the fourth pipeline at the same time, and pump the electrolyte into the impregnation cylinder through the pressure pump until the second liquid level sensor detects the electrolyte, and then the second control valve, the fourth control valve, the eighth control valve and the vacuum pump are closed; S4-3 pressurization The pressure pump continues to work, and the electrolyte in the liquid storage tank enters the impregnation cylinder through positive pressure until the pressure detected by the pressure sensor reaches 1.2 Mpa, and then the pressure pump and the third control valve are closed; S4-4 pressure keeping The pressure in the impregnation cylinder is controlled at 1.2 Mpa until the set time length; S4-5 normal pressure Close the pressure pump and open the ninth control valve, and the electrolyte in the impregnation cylinder returns to the liquid storage tank through the fifth pipeline under the action of pressure until the pressure in the impregnation cylinder returns to normal; S4-6 liquid return Open the second control valve, the fifth control valve, the sixth control valve, and start the vacuum pump; vacuumize the liquid storage tank, and the electrolyte in the impregnation cylinder returns to the liquid storage tank through the fifth pipeline until the liquid level in the impregnation cylinder drops to the first liquid level sensor, and then the second control valve, the third control valve, the fifth control valve and the ninth control valve are closed; Further, the pressure keeping time of the first to second impregnation cycle is 3000-4000 s, and the pressure keeping time of the second to n-th impregnation cycle is 1500-4000 s.
[0009] Further, during the pressure keeping process S4-4 of the impregnation cycle, a plurality of pressure frequency cycles are performed, and the process of the pressure frequency cycle is as follows: S4-41 open the ninth control valve, and the electrolyte in the impregnation cylinder returns to the liquid storage tank through the fifth pipeline until the pressure in the impregnation cylinder drops to 0.2 Mpa, and then the ninth control valve is closed; S4-42 opens the pressurizing pump and the third control valve, and the pressurizing pump pumps the electrolyte in the storage tank to the impregnation cylinder until the pressure in the impregnation cylinder reaches 1.2 MPa, and then the pressurizing pump and the third control valve are closed.
[0010] Advantages of the present application: (1) The present application prolongs the single holding time of the initial impregnation cycle and reduces the single holding time of the later impregnation cycle by taking advantage of the fact that the initial impregnation elements are easier to impregnate, which improves the incomplete impregnation of the traditional impregnation process caused by the consistent holding time from the initial impregnation to the end of the impregnation, thereby reducing the impregnation efficiency.
[0011] (2) Furthermore, the present application increases the frequency pressure cycle process during the holding stage of the initial impregnation cycle, that is, by pressurizing and depressurizing the electrolyte in the cylinder for a short time, the flowability of the electrolyte is increased, so that the gas trapped in the positive foil holes by the electrolyte can be released, the amount of gas remaining in the positive foil holes is reduced, the difficulty of the electrolyte penetrating into the small holes of the positive foil is reduced, and the difficulty of impregnating the positive foil is reduced. BRIEF DESCRIPTION OF DRAWINGS
[0012] Figure 1 The system diagram for impregnating the capacitor element.
[0013] Vacuum tank 1, vacuum pump 2, storage tank 3, impregnation cylinder 4, pressurizing pump 5, first pipeline 6, first control valve 7, buffer tank 8, second pipeline 9, second control valve 10, fourth control valve 11, emptying pipe 12, fifth control valve 13, third control valve 14, third pipeline 15, fourth pipeline 16, sixth control valve 17, eighth control valve 18, liquid discharge pipe 19, seventh control valve 20, fifth pipeline 21, ninth control valve 22, first liquid level sensor 23, pressure sensor 24, second liquid level sensor 25. DETAILED DESCRIPTION
[0014] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.
[0015] Embodiment 1: as Figure 1As shown, a capacitor element impregnation system includes a vacuum tank 1, a vacuum pump 2, a liquid storage tank 3, an impregnation cylinder 4, and a pressurizing pump 5. The outlet of the vacuum pump 2 is connected to the inlet of the vacuum tank 1. The inlet of the vacuum pump 2 is connected to the top of the impregnation cylinder 4 through a first pipeline 6. A first control valve 7 is installed on the first pipeline 6. The impregnation cylinder 4 is vacuumized by starting the vacuum pump 2 and opening the first control valve 7. A buffer tank 8 is arranged inside the top of the liquid storage tank 3. The top of the impregnation cylinder 4 is connected to the inlet of the buffer tank 8 through a second pipeline 9. A second control valve 10 is installed on the inlet end of the second pipeline 9. A fourth control valve 11 is installed on the outlet end of the second pipeline 9. A venting pipeline 12 is connected to the top of the second pipeline 9. A fifth control valve 13 is installed on the venting pipeline 12. The gas in the second pipeline 9 is vented by opening the fifth control valve 13. The outlet of the liquid storage tank 3 is connected to the inlet of the pressurizing pump 5. The outlet of the pressurizing pump 5 is connected to the bottom of the impregnation cylinder 4. A third control valve 14 is arranged on the outlet side of the pressurizing pump 5. The electrolyte in the liquid storage tank 3 is pressurized and sent to the impregnation cylinder 4 by starting the pressurizing pump 5 and opening the third control valve 14. The inlet of the vacuum pump 2 is connected to the top of the liquid storage tank 3 and the top of the buffer tank 8 through a third pipeline 15 and a fourth pipeline 16, respectively. A sixth control valve 17 and an eighth control valve 18 are installed on the third pipeline 15 and the fourth pipeline 16, respectively. The liquid storage tank 3 and the buffer tank 8 are vacuumized by starting the vacuum pump 2 and opening the sixth control valve 17 or the eighth control valve 18. A liquid discharge pipeline 19 is connected to the bottom of the buffer tank 8. A seventh control valve 20 is installed on the liquid discharge pipeline 19. The buffer tank 8 and the liquid storage tank 3 are connected by opening the seventh control valve 20. A fifth pipeline 21 is connected between the bottom of the impregnation cylinder 4 and the bottom of the liquid storage tank 3. A ninth control valve 22 is installed on the fifth pipeline 21. When the pressure in the impregnation cylinder 4 is higher than the pressure in the liquid storage tank 3, the electrolyte in the impregnation cylinder 4 flows back to the liquid storage tank 3 through the fifth pipeline 21.
[0016] A first liquid level sensor 23 and a pressure sensor 24 are arranged on the upper part of the impregnation cylinder 4. The first liquid level sensor 23 and the pressure sensor 24 are used to monitor the liquid level and the pressure in the impregnation cylinder 4, respectively. A second liquid level sensor 25 is installed on the outlet end of the second pipeline 9. Whether the electrolyte passes through the second pipeline 9 can be monitored and determined by the second liquid level sensor 25.
[0017] Example 2: A capacitor element impregnation method based on the capacitor element impregnation system of example 1, which includes the following steps: S1 Element into cylinder The element is loaded into the impregnation cylinder below the first liquid level sensor. The first to ninth control valves are kept closed. S2 Vacuumizing Open the first control valve and start the vacuum pump to vacuum the impregnation cylinder through the first pipeline, the vacuum degree is-0.098Mpa, after 1000s of vacuumizing, close the first control valve and the vacuum pump; through vacuumizing the impregnation cylinder, the amount of gas remaining in the impregnation cylinder and the element can be reduced, especially the gas in the positive foil hole of the element, so as to reduce the internal pressure of the impregnation cylinder.
[0018] S3 once liquid Open the third control valve and start the pressurizing pump, pump the electrolyte in the liquid tank to the impregnation cylinder through the pressurizing pump until the liquid level in the impregnation cylinder reaches the first liquid level sensor, close the third control valve and the pressurizing pump; S4 impregnation cycle The electrolyte in the impregnation cylinder and the liquid tank is subjected to 5-n times of impregnation cycle, and then the liquid level in the impregnation cylinder is controlled to be at the position of the first liquid level sensor; the S4 impregnation cycle process is as follows: S4-1 vacuum keeping Open the first control valve and start the vacuum pump to continue vacuumizing the impregnation cylinder, reduce the amount of gas carried by the electrolyte, the vacuum degree is-0.098Mpa, the keeping time is 800s, and then close the first control valve; S4-2 second liquid injection Open the second control valve, the third control valve, the fourth control valve and the eighth control valve, and start the pressurizing pump, vacuumize the buffer tank through the fourth pipeline at the same time, and pump the electrolyte into the impregnation cylinder through the pressurizing pump until the electrolyte is monitored by the second liquid level sensor, close the second control valve, the fourth control valve, the eighth control valve and the vacuum pump; S4-3 pressurization The pressurizing pump continues to work, the electrolyte in the liquid tank enters the impregnation cylinder through positive pressure until the pressure detected by the pressure sensor reaches 1.2Mpa, close the pressurizing pump and the third control valve; by increasing the amount of injected electrolyte through the pressurizing pump, the hydraulic pressure in the cylinder is increased, so that the material inside the element and the electrolyte outside the element form a large pressure difference, so that the electrolyte can more easily penetrate into the element, and the purpose of thorough impregnation of the element is achieved.
[0019] S4-4 pressure keeping The pressure in the impregnation cylinder is controlled at 1.2Mpa until the set time; S4-5 normal pressure Close the pressurizing pump and open the ninth control valve, the electrolyte in the impregnation cylinder returns to the liquid tank through the fifth pipeline under the action of pressure until the pressure in the impregnation cylinder returns to normal; S4-6 liquid return Open the second control valve, the fifth control valve, the sixth control valve, and start the vacuum pump; the electrolyte in the impregnation cylinder is returned to the liquid storage tank through the fifth pipeline until the liquid level in the impregnation cylinder drops to the first liquid level sensor, and the second control valve, the third control valve, the fifth control valve and the ninth control valve are closed. The S4-4 pressure maintaining time length of the first to second impregnation cycles is 3000-4000s, and the pressure maintaining time length of the second to n-th impregnation cycles is 15000-4000s. During the S4-4 pressure maintaining process of the impregnation cycle, several pressure frequency cycles are performed. By increasing the proportion of the pressure maintaining time in the initial impregnation cycle, the flowability of the electrolyte in the impregnation cylinder is enhanced through the pressure frequency cycle. The flowing electrolyte carries out the gas bubbles in the positive foil holes, reduces the difficulty of impregnation, enhances the impregnation thoroughness of the element in the initial impregnation cycle of the impregnation cylinder, and reduces the difficulty of subsequent impregnation cycles. The process of the pressure frequency cycle is as follows: S4-41 Open the ninth control valve, and the electrolyte in the impregnation cylinder is returned to the liquid storage tank through the fifth pipeline until the pressure in the impregnation cylinder drops to 0.2Mpa, and the ninth control valve is closed. In this process, the amount of electrolyte in the impregnation cylinder decreases, the external hydraulic pressure of the element decreases, the electrolyte inside the element overflows outward under the pressure difference, the flowability of the electrolyte in the cylinder is increased, and part of the gas in the hole is carried out, reducing the amount of gas remaining in the hole; S4-42 Open the pressure pump and the third control valve, and the pressure pump pumps the electrolyte in the liquid storage tank to the impregnation cylinder until the pressure in the impregnation cylinder reaches 1.2Mpa, and the pressure pump and the third control valve are closed. In this process, the amount of electrolyte in the impregnation cylinder increases, the external hydraulic pressure of the element is higher than the internal hydraulic pressure of the element, the electrolyte flows back to the internal part of the element, the amount of gas remaining in the positive foil hole is reduced, the resistance of the electrolyte to the impregnation is reduced, and the electrolyte can more easily impregnate the positive foil hole.
[0020] S5 backflow and liquid removal Open the second control valve, the fifth control valve, and the sixth control valve, and vacuumize the liquid storage tank through the third pipeline until all the electrolyte in the impregnation cylinder flows back to the liquid storage tank. Then the impregnation cylinder starts the liquid removal mode, and the excess electrolyte on the surface of the element is spun dry at a speed of 550r / min for 300s. The spun electrolyte is returned to the liquid storage tank through the second pipeline.
[0021] Experimental group 1: The overall process method is carried out according to the method of example 2, wherein: S1 Element into cylinder The size of the element is 30×34 mm (diameter×height), the viscosity of the electrolyte is 30mPa·s, and the wound element is placed in the impregnation cylinder to the full cylinder; S2 Vacuumizing The vacuumizing time is 1000s, and the vacuum degree is-0.098Mpa. S3 impregnation cycle A total of 5 impregnation cycles were performed, the S4-4 holding time of the first impregnation cycle was 4000 s, and the frequency of the frequency pressure cycle was 1000 s / time; the S4-4 holding time of the 2nd-5th impregnation cycle was 1500 s, and the frequency of the frequency pressure cycle was 1500 s / time.
[0022] Experimental group 2: the whole was the same as experimental group 1, the difference was that in S3, the holding time of the early cycle was 3000 s, and the frequency of the frequency pressure cycle was 500 s / time; the holding time of the late cycle was 4000 s, and the frequency of the frequency pressure cycle was 500 s / time.
[0023] Experimental group 3: the whole was the same as experimental group 1, the difference was that in S3, the holding time of the early cycle was 4000 s, and the frequency of the frequency pressure cycle was 2000 s / time.
[0024] Experimental group 4: the whole was the same as experimental group 1, the difference was that in S3, a total of 7 impregnations were performed, the holding time of the 1st-2nd was 4000 s, and the frequency of the frequency pressure cycle was 1000 s / time; the holding time of the 3rd-7th impregnation was 1500 s, and the frequency of the frequency pressure cycle was 1500 s / time.
[0025] Comparison group 1: the whole was the same as experimental group 1, the difference was that in S3, the S4-4 holding time of the first impregnation cycle was 4000 s; the S4-4 holding time of the 2nd-5th impregnation cycle was 1500 s; and there was no frequency pressure cycle during the holding time.
[0026] Comparison group 2: the whole was the same as experimental group 1, the difference was that in S3, the S4-4 holding time of the first impregnation cycle was 3000 s, and the frequency of the frequency pressure cycle was 1000 s / time; the S4-4 holding time of the 2nd-5th impregnation cycle was 3000 s, and the frequency of the frequency pressure cycle was 1500 s / time.
[0027] From the above experimental groups 1-4 and comparison groups 1-2, 3 cells were randomly selected from the impregnated cells for charging, and the capacity and DF value of the cells were tested, as shown in the following table:
[0028] After the impregnated cells of each group were subjected to the assembly aging program, 100 products were randomly selected from each group of cells after the aging was completed, and the average DF value and capacity of the 100 products were recorded, as shown in Table 2;
[0029] The capacity tolerance and DF value of the element after impregnation, and the capacity tolerance and DF value of the product after aging meet the standards of SJ / T11001-2023 "Electronic Components Detailed Specification CD291, CD292, CD293 Type Fixed Aluminum Electrolytic Capacitor Evaluation Level E", and through the above experimental groups and the comparison group, it can be known that: (1) Through the comparison of the capacity tolerance and DF value of experimental group 1 and comparison group 1, it can be known that when the pressure maintaining time is prolonged in the initial impregnation cycle, and the frequency pressure cycle is increased, the total impregnation time of the present application is shortened, and the DF value of the product is reduced to a certain extent, which indicates that the impregnation effect is good, and the efficiency is improved; the reason is that the pressure maintaining time is prolonged in the initial impregnation cycle, and the flowability of the electrolyte in the impregnation cylinder is increased by adding the frequency pressure program, the adhesion of the internal material of the element is reduced, so that the impregnation degree of the electrolyte to the element is high in the initial impregnation cycle, and the difficulty of the subsequent impregnation is reduced.
[0030] (2) Through the comparison of the capacity tolerance and DF value of experimental group 1 and comparison group 1, it can be known that under the condition that the pressure maintaining time is prolonged in the initial impregnation cycle, the frequency pressure cycle process is added in experimental group 1, which can strengthen the flowability of the electrolyte in the impregnation cylinder, the flowing electrolyte can take out the gas bubbles in the positive foil hole, and the impregnation thoroughness of the impregnation cylinder to the element in the initial impregnation cycle can be strengthened, and the difficulty of the subsequent impregnation of the element is reduced.
[0031] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "front", "rear", "top", "bottom", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the present application.
Claims
1. A capacitor element impregnation system characterized by, It includes a vacuum tank, a vacuum pump, a liquid storage tank, an impregnation cylinder, a pressurizing pump, an outlet of the vacuum pump is communicated with an inlet of the vacuum tank, an inlet of the vacuum pump is communicated with a top of the impregnation cylinder through a first pipeline, a first control valve is installed on the first pipeline; a buffer tank is arranged inside a top end of the liquid storage tank, the top of the impregnation cylinder is communicated with an inlet of the buffer tank through a second pipeline, a second control valve is installed on an inlet end of the second pipeline, a fourth control valve is installed on an outlet end of the second pipeline, a venting pipe is communicated with a top of the second pipeline, and a fifth control valve is installed on the venting pipe; an outlet of a bottom end of the liquid storage tank is communicated with an inlet of the pressurizing pump, an outlet of the pressurizing pump is communicated with a bottom of the impregnation cylinder, and a third control valve is arranged on the outlet side of the pressurizing pump; the inlet of the vacuum pump is communicated with a top of the liquid storage tank and a top of the buffer tank through a third pipeline and a fourth pipeline respectively, and a sixth control valve and an eighth control valve are installed on the third pipeline and the fourth pipeline respectively; a liquid discharge pipe is communicated with a bottom end of the buffer tank, and a seventh control valve is installed on the liquid discharge pipe; a fifth pipeline is communicated between the bottom of the impregnation cylinder and the bottom of the liquid storage tank, and a ninth control valve is installed on the fifth pipeline; a first liquid level sensor and a pressure sensor are arranged on an upper portion of the impregnation cylinder, and a second liquid level sensor is installed on the outlet end of the second pipeline.
2. A capacitor element impregnation method characterized by comprising: It comprises the following steps: S1 element into the cylinder The element is loaded into the impregnation cylinder below the first liquid level sensor, and the first to ninth control valves are kept in the closed state; S2 vacuumizing The first control valve is opened, and the vacuum pump is started, the impregnation cylinder is vacuumized through the first pipeline, the vacuum degree is-0.098Mpa, after 1000s of vacuumizing, the first control valve is closed and the vacuum pump is stopped; S3 first liquid feeding The third control valve is opened, and the pressurizing pump is started, the electrolyte in the liquid storage tank is pumped to the impregnation cylinder through the pressurizing pump until the liquid level in the impregnation cylinder reaches the first liquid level sensor, then the third control valve and the pressurizing pump are closed; S4 impregnation cycle The electrolyte in the impregnation cylinder and the liquid storage tank is subjected to 5-n times of impregnation cycle, then the liquid level in the impregnation cylinder is controlled to be at the position of the first liquid level sensor; S5 backflow and liquid removal The second control valve, the fifth control valve and the sixth control valve are opened, the liquid storage tank is vacuumized through the third pipeline until the electrolyte in the impregnation cylinder is completely backflowed to the liquid storage tank, then the impregnation cylinder starts the liquid removal mode, the electrolyte is removed at a speed of 550r / min for 300s, the excess electrolyte on the surface of the element is spun dry, and the spun electrolyte is returned to the liquid storage tank through the second pipeline.
3. The capacitor element impregnation method according to claim 2, wherein The S4 impregnation cycle process is as follows: S4-1 vacuum maintaining The first control valve is opened, and the vacuum pump is started, the impregnation cylinder is continuously vacuumized, the vacuum degree is-0.098Mpa, the maintaining time is 800s, then the first control valve is closed; S4-2 second liquid feeding Open the second control valve, the third control valve, the fourth control valve and the eighth control valve, and start the pressurizing pump, and at the same time, the buffer tank is vacuumized through the fourth pipeline, and the electrolyte is pumped into the impregnation cylinder through the pressurizing pump, until the second liquid level sensor detects the electrolyte, and the second control valve, the fourth control valve, the eighth control valve and the vacuum pump are closed; S4-3 pressurization The pressurizing pump continues to work, and the electrolyte in the liquid storage tank enters the impregnation cylinder through positive pressure, until the pressure detected by the pressure sensor reaches 1.2Mpa, and the pressurizing pump and the third control valve are closed; S4-4 pressure maintenance The pressure in the impregnation cylinder is controlled at 1.2Mpa until the set time length; S4-5 normal pressure Close the pressurizing pump, open the ninth control valve, and the electrolyte in the impregnation cylinder returns to the liquid storage tank through the fifth pipeline under the action of pressure until the pressure in the impregnation cylinder returns to normal; S4-6 liquid return Open the second control valve, the fifth control valve and the sixth control valve, and start the vacuum pump; the electrolyte in the impregnation cylinder returns to the liquid storage tank through the fifth pipeline until the liquid level in the impregnation cylinder drops to the first liquid level sensor, and the second control valve, the third control valve, the fifth control valve and the ninth control valve are closed.
4. The capacitor element impregnation method according to claim 3, wherein The S4-4 pressure maintenance time length of the first-2 impregnation cycle is 3000-4000s, and the pressure maintenance time length of the second-n impregnation cycle is 1500-4000s.
5. The capacitor element impregnation method according to claim 4, wherein During the S4-4 pressure maintenance process of the impregnation cycle, a plurality of pressure frequency cycles are carried out, and the process of the pressure frequency cycle is as follows: S4-41 open the ninth control valve, and the electrolyte in the impregnation cylinder returns to the liquid storage tank through the fifth pipeline until the pressure in the impregnation cylinder drops to 0.2Mpa, and the ninth control valve is closed; S4-42 open the pressurizing pump and the third control valve, and the pressurizing pump pumps the electrolyte in the liquid storage tank into the impregnation cylinder until the pressure in the impregnation cylinder reaches 1.2Mpa, and the pressurizing pump and the third control valve are closed.