Polypropylene film dielectric composite capacitor and application thereof

Abstract

The invention discloses a polypropylene film dielectric composite capacitor and application thereof, and the capacitor comprises a housing which comprises an upper cylinder and a lower cylinder; the core body is arranged in the lower cylinder body, two sets of wire guide rods are arranged at the top of the core body, and a partition plate is connected between the two sets of wire guide rods. According to the pressure relief device, the air inlet end of the pressure relief part is sealed through the elastic sealing part, the second air storage tank and the first air storage tank are disconnected, and internal medium leakage caused in the pressure relief process is effectively avoided; when the elastic sealing element is switched to the first state, external impurities are prevented from entering the capacitor, the impurities are prevented from being mixed into an internal medium to change the property of the capacitor, meanwhile, when the elastic sealing element is switched to the second state, gas in the first gas storage tank can enter the second gas storage tank through the sliding groove and the communication channel, pressure relief is performed from a gas outlet of the second gas storage tank, and the cycle is repeated. Therefore, the problem that the internal pressure of the capacitor is suddenly changed, so that the internal part of the shell is impacted can be avoided.

Description

Technical Field

[0001] The invention relates to the technical field of capacitors, in particular to a polypropylene film dielectric composite capacitor and applications thereof. Background Art

[0002] A capacitor is a device that stores charge. An insulating dielectric is sandwiched between two metal electrodes. When voltage is applied between the two metal electrodes, charge is stored on the electrodes. Therefore, the capacitor is an energy storage element. Capacitors play a wide range of roles in circuits, including coupling, filtering, resonance, integration, differentiation, etc. Power capacitors are widely used in factory distribution systems, residential distribution systems, municipal commercial buildings, traffic tunnel distribution systems, box transformers, complete sets of cabinets, outdoor distribution boxes and other situations.

[0003] When the capacitor is working, it generates excessive heat and vaporizes the electrolyte in the shell, so that the internal pressure of the capacitor shell rises sharply and needs to be relieved. However, when the existing capacitor is relieved, a local pressure drop area will be formed inside the capacitor, which will impact the internal structure. At the same time, during the pressure relief process, there may also be leakage of the internal medium, which will not only reduce the performance of the capacitor, but also may pollute the environment. Summary of the invention

[0004] The present invention aims at the deficiencies in the prior art and provides the following technical solutions:

[0005] Polypropylene film dielectric composite capacitor, including:

[0006] A housing, the housing comprising an upper cylinder and a lower cylinder;

[0007] The core body is arranged in the lower cylinder body, two groups of conductor rods are arranged on the top of the core body, a partition is connected between the two groups of conductor rods, and the partition can seal the lower cylinder body;

[0008] A cover body is arranged on the top of the upper cylinder body, and a slide groove corresponding to the number and position of the conductor rods is opened on the cover body. An annular gas storage tank 1 is arranged on the cover body and outside the two groups of slide grooves. The slide groove is connected to the gas storage tank 1 through a connecting pipe near the bottom position, and the slide groove is connected to the gas storage tank 1 through a connecting channel near the top position;

[0009] Binding posts are arranged on the cover body, and two groups of the binding posts are arranged, and the binding posts are electrically connected to the conductor rod;

[0010] A pressure relief member is disposed in the cover body, the pressure relief member has an air inlet end and an air outlet end, the air inlet end is connected to the slide groove, and the air inlet end is located between the connecting pipe and the connecting channel;

[0011] An elastic seal is arranged in the slide groove, the top of the conductor rod extends into the slide groove and abuts against the bottom of the elastic seal, the elastic seal has a first state and a second state, and the elastic seal can switch between the first state and the second state;

[0012] The first state: the elastic sealing member moves upward to seal the air inlet end of the pressure relief member, and the connecting pipe is opened to control the air storage tank 1 and the pressure relief member to be in a disconnected state.

[0013] The second state: the elastic sealing member moves downward to seal the connecting pipe, and the air inlet end of the pressure relief member is opened, controlling the air storage tank to be in a connected state with the pressure relief member through the slide groove.

[0014] As an improvement of the above technical solution, the elastic sealing member includes an insulating sealing plug slidably disposed in a slide groove, and a spring is disposed between the top of the insulating sealing plug and the slide groove.

[0015] As an improvement of the above technical solution, the pressure relief component includes an annular air storage tank 2 arranged inside the cover body and located between the two groups of slide grooves, the air inlet end of the air storage tank 2 is connected to the slide groove through a pipeline, the pipeline is located between the connecting channel and the connecting pipe, and an air outlet is arranged on the top of the cover body and above the air storage tank 2, and an air outlet valve is arranged on the top of the air outlet.

[0016] As an improvement of the above technical solution, the air outlet valve includes an outer sleeve fixedly arranged on the cover body and located above the air outlet, the outer sleeve has a plurality of groups of air outlet holes 1 on its circumferential surface, an inner sleeve is slidably connected inside the outer sleeve, a gap is provided between the top of the inner sleeve and the top of the inner wall of the outer sleeve, the surface of the inner sleeve has a plurality of groups of air outlet holes 2, the bottom of the inner sleeve has two groups of air inlet holes, and the spacing between the two groups of air inlet holes is greater than the diameter of the air outlet.

[0017] As an improvement of the above technical solution, under the action of gravity of the inner sleeve, the air outlet hole 1 and the air outlet hole 2 are in a staggered state, and the height of the gap is equal to the distance between the center line of the air outlet hole 1 and the center line of the air outlet hole 2.

[0018] As an improvement of the above technical solution, a dust cover is provided at the bottom of the inner wall of the inner sleeve, and the dust cover divides the cavity of the inner sleeve into chamber one and chamber two from the inside to the outside. The top of the dust cover is open to allow chamber one and chamber two to communicate, and the height of the dust cover is greater than the position of the highest group of air outlet holes two, and the height of the dust cover is less than the height of the inner sleeve.

[0019] As an improvement of the above technical solution, an enlarged portion with a truncated cone-shaped structure is provided at the bottom of the terminal, and a connecting plate is fixedly connected to each group of the conductor rods and located above the partition, and a connecting hole matching the enlarged portion is opened on the connecting plate, and multiple groups of elastic connecting plates are arranged in the connecting holes, and the minimum diameter of the enlarged portion is larger than the diameter of the terminal.

[0020] The application of the polypropylene film dielectric composite capacitor described above in electronic circuits.

[0021] Beneficial effects of the present invention:

[0022] The air inlet end of the pressure relief component is sealed by an elastic seal, and the air storage tank 2 is disconnected from the air storage tank 1, which effectively avoids leakage of the internal medium during the pressure relief process, and also prevents external impurities from entering the capacitor, preventing impurities from mixing into the internal medium and changing its properties. At the same time, the connecting pipe is opened, so that the air pressure inside the shell enters the air storage tank 1, which is equivalent to constructing a temporary air pressure buffer area inside the capacitor, dispersing a part of the excessive and potentially dangerous air pressure in the shell to the air storage tank 1, avoiding the continuous and sharp rise of local pressure in the shell, thereby reducing the risk of shell rupture due to excessive pressure, and the elastic seal switches to the second state. At this time, the gas inside the air storage tank 1 can enter the air storage tank 2 through the slide groove and the connecting channel. The air storage tank 2 serves as a further pressure relief transfer area, and the pressure is relieved from the air outlet of the air storage tank 2. This cycle is repeated to gradually discharge the gas. By gradually discharging the gas, the problem of sudden changes in the internal pressure of the capacitor causing impact inside the shell can be avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the elastic sealing member of the present invention in the second state;

[0024] Figure 2 For the present invention Figure 1 The enlarged structural diagram at A in the middle;

[0025] Figure 3 It is a structural schematic diagram of the elastic sealing member of the present invention in a first state;

[0026] Figure 4 For the present invention Figure 3 The enlarged structural diagram at B in the middle;

[0027] Figure 5 It is a structural schematic diagram of the pressure relief valve of the present invention;

[0028] Figure 6 It is a structural schematic diagram of the pressure relief valve of the present invention in a pressure relief state;

[0029] Figure 7It is a schematic diagram of the connection structure of the inner sleeve and the outer sleeve of the present invention.

[0030] Figure numerals: 10, shell; 11, cover; 110, air storage tank one; 111, slide groove; 112, air storage tank two; 113, connecting channel; 114, connecting pipe; 12, terminal; 121, expansion part; 13, insulating sealing plug; 14, spring; 15, air outlet valve; 151, outer sleeve; 1511, air outlet hole one; 152, inner sleeve; 1521, air inlet; 1522, dust cover; 1523, air outlet hole two; 1524, limiting rod; 20, core; 21, partition; 22, conductor rod; 23, connecting plate; 231, connecting hole; 232, connecting piece; 30, limiting ring. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0032] Embodiment 1

[0033] A polypropylene film dielectric composite capacitor comprises: a shell 10, a core 20 and a cover 11;

[0034] The housing 10 comprises an upper cylinder and a lower cylinder, wherein the diameter of the upper cylinder is greater than the diameter of the lower cylinder;

[0035] The core 20 is arranged in the lower cylinder, and two groups of conductor rods 22 are arranged on the top of the core 20. A partition 21 is connected between the two groups of conductor rods 22, and the partition 21 can seal the lower cylinder. The core 20 is wound by stacking polypropylene film dielectric layers and metallized polypropylene film layers; the core 20 is wound by polypropylene film dielectric layers and metallized polypropylene film layers, and is responsible for storing electric charge. The current enters through the terminal 12 and is conducted to the core 20 through the conductor rod 22.

[0036] The cover body 11 is arranged on the top of the upper cylinder body, and the cover body 11 is provided with slide grooves 111 corresponding to the number and position of the conductor rods 22. The cover body 11 is provided with an annular gas storage tank 110 outside the two groups of slide grooves 111. The slide groove 111 is connected to the gas storage tank 110 through a connecting pipe 114 near the bottom, and the slide groove 111 is connected to the gas storage tank 110 through a connecting channel 113 near the top.

[0037] The terminal posts 12 are disposed on the cover 11 . The terminal posts 12 are provided in two groups. The terminal posts 12 are electrically connected to the conductor rod 22 .

[0038] A pressure relief member is disposed in the cover body 11, and has an air inlet end and an air outlet end. The air inlet end is connected to the slide groove 111, and the air inlet end is located between the connecting pipe 114 and the connecting channel 113;

[0039] The pressure relief member includes an annular gas storage tank 112 disposed inside the cover body 11 and between the two groups of slide grooves 111. The gas inlet end of the gas storage tank 112 is connected to the slide groove 111 through a pipeline, and the pipeline is between the connecting channel 113 and the connecting pipe 114. The top of the cover body 11 and above the gas storage tank 112 is provided with an air outlet, and the top of the air outlet is provided with an air outlet valve 15.

[0040] An elastic seal is disposed in the slide groove 111, the top of the conductor rod 22 extends into the slide groove 111 and abuts against the bottom of the elastic seal, the elastic seal has a first state and a second state, and the elastic seal can switch between the first state and the second state;

[0041] The first state: the air pressure in the shell increases, the elastic sealing member moves upward to seal the air inlet end of the pressure relief member, and the connecting pipe 114 is opened to control the air storage tank 110 and the pressure relief member to be in a disconnected state.

[0042] The second state: the air pressure in the shell returns to normal, the elastic seal moves downward to seal the connecting pipe 114, and the air inlet end of the pressure relief component is opened, controlling the air storage tank 110 to be in a connected state with the pressure relief component through the slide groove 111.

[0043] When the capacitor is operating normally, the internal air pressure is within the normal range. At this time, since the internal air pressure is relatively stable, the partition 21 is located at the connection between the upper cylinder and the lower cylinder, and under the elastic action of the elastic seal, the partition 21 seals the core of the lower cylinder, and the elastic seal is in the second state, that is, the elastic seal seals the connecting pipe 114, and at the same time opens the air inlet end of the pressure relief member, so that the air storage tank 1 10 is in a connected state with the air storage tank 2 112 of the pressure relief member through the slide slot 111, and the current can be normally transmitted to the conductor rod 22 through the terminal 12, and then the normal capacitor function operations such as storage and release of electric energy are performed in the core 20;

[0044] When the air pressure in the shell increases due to overload, overheating, etc., the oil expands, causing the partition 21 and the core 20 to rise. At the same time, the air pressure and the wire rod 22 exert an upward force on the elastic seal. When this force is sufficient to overcome the elastic force of the elastic seal that originally maintains the second state, the elastic seal begins to move upward and switches to the first state. In the first state, the elastic seal seals the air inlet end of the pressure relief component and disconnects the air storage tank 2 112 from the air storage tank 1 110, effectively avoiding leakage of the internal medium during the pressure relief process, and also preventing external impurities from entering the capacitor, preventing impurities from mixing into the internal medium and changing its properties. At the same time, the connecting pipe 114 is opened, so that the shell The air pressure inside the shell 10 enters the air storage tank 110. Since the elastic seal is connected to the air storage tank 110 through the connecting channel 113, the air pressure of the two is consistent, which is equivalent to building a temporary air pressure buffer area inside the capacitor, dispersing part of the excessive and potentially dangerous air pressure in the shell 10 to the air storage tank 110, avoiding the continuous and sharp rise of local pressure in the shell 10, thereby reducing the risk of the shell 10 rupture due to excessive pressure. When the air pressure in the air storage tank 110 gradually becomes consistent with the air pressure inside the shell 10, the upward air pressure acting on the elastic seal gradually decreases, and the elastic seal moves downward under the action of its own elastic force, so that the elastic seal will The connecting pipe 114 is closed, and the air inlet end of the pressure relief component is opened, that is, the elastic sealing component is switched to the second state. At this time, the gas inside the gas storage tank 110 can enter the gas storage tank 2 112 through the slide groove 111 and the connecting channel 113. The gas storage tank 2 112 serves as a further pressure relief transfer area, and the pressure is relieved from the gas outlet of the gas storage tank 2 112. This cycle is repeated to gradually discharge the gas. By gradually discharging the gas, a sudden change in the internal pressure of the capacitor can be avoided. If a large amount of gas is discharged at one time, the internal pressure will drop instantly, which may have an impact on the structure of the capacitor, such as causing deformation of the shell 10, displacement of the core 20 and other problems. Gradually exhausting the gas can smooth the pressure. The pressure inside the capacitor is gradually reduced to maintain the stability of the internal structure of the capacitor. Rapid gas discharge may cause splashing or leakage of the internal medium, while gradual exhaust can keep the medium inside the capacitor in a relatively stable environment. Through this orderly pressure relief process, the excessive internal air pressure is gradually reduced, so that the pressure inside the entire capacitor is always within a safe and controllable range, preventing explosion accidents caused by excessive internal pressure breaking through the shell and other structures. As the air pressure further returns to normal, the gas distribution and pressure state inside the entire capacitor gradually return to the equilibrium state during normal operation, thereby ensuring that the capacitor can continue to operate stably and provide a reliable working environment for subsequent functions such as energy storage and conversion.

[0045] In one embodiment, the air outlet valve 15 includes an outer sleeve 151 fixedly arranged on the cover body 11 and located above the air outlet, and the outer sleeve 151 has multiple groups of air outlet holes 1511 on its circumferential surface, and an inner sleeve 152 is slidably connected inside the outer sleeve 151, and there is a gap between the top of the inner sleeve 152 and the top of the inner wall of the outer sleeve 151, and multiple groups of air outlet holes 2 1523 are formed on the surface of the inner sleeve 152, and two groups of air inlet holes 1521 are formed at the bottom of the inner sleeve 152, and the distance between the two groups of air inlet holes 1521 is greater than the diameter of the air outlet.

[0046] Under the action of gravity of the inner sleeve 152 , the first air outlet hole 1511 and the second air outlet hole 1523 are in a staggered state, and the height of the gap is equal to the distance between the center line of the first air outlet hole 1511 and the center line of the second air outlet hole 1523 .

[0047] A dust cover 1522 is provided at the bottom of the inner wall of the inner sleeve 152, and the dust cover divides the cavity of the inner sleeve 152 into chamber one and chamber two from the inside to the outside. The top of the dust cover is open to allow chamber one and chamber two to communicate with each other. The height of the dust cover 1522 is greater than the position of the highest group of air outlet holes 1523, and the height of the dust cover 1522 is less than the height of the inner sleeve 152.

[0048] Specifically, under normal circumstances, the inner sleeve 152 is in the initial position under the action of gravity. At this time, the first gas outlet 1511 and the second gas outlet 1523 are in a staggered state, thereby preventing the gas inside the capacitor from being discharged outward.

[0049] Since the spacing between the air inlet holes 1521 at the bottom of the inner sleeve 152 is greater than the diameter of the air outlet, under normal conditions, the inner sleeve 152 is disconnected from the air storage tank 112 to prevent dust and impurities from entering the capacitor. The dust cover 1522 arranged at the bottom of the inner wall of the inner sleeve 152 further enhances the dustproof effect. The dust cover 1522 divides the cavity of the inner sleeve 152 into chamber one and chamber two, and its height is greater than the position of the highest group of air outlet holes 1523. This means that even if a small amount of dust enters chamber two through the air outlet holes 1511 and 1523, it is difficult to cross the dust cover 1522 and enter chamber one, thereby effectively preventing dust from entering the interior of the capacitor.

[0050] When the air pressure in the second air storage tank 112 is greater than the gravity of the inner sleeve 152, the gas pushes the inner sleeve 152 to move upward, and the gas enters the air inlet 1521 at the bottom of the inner sleeve 152 from the second air storage tank 112 through the air outlet, and the first air outlet 1511 and the second air outlet 1523 are gradually connected. Since the height of the gap is equal to the distance between the center line of the first air outlet 1511 and the center line of the second air outlet 1523, when the inner sleeve 152 moves upward by the height of the gap, the first air outlet 1511 and the second air outlet 1523 are exactly connected. Align to reach the maximum gas outlet. At this time, the high-pressure gas inside the capacitor can enter chamber two through the air inlet 1521, and then be discharged to the external environment through the aligned air outlet two 1523 and air outlet one 1511, thereby realizing the pressure relief function. When the internal pressure of the capacitor is reduced, the upward thrust of the gas on the inner sleeve 152 is reduced, and the inner sleeve 152 begins to move downward under the action of its own gravity. The air outlet one 1511 and the air outlet two 1523 are staggered again, the gas discharge is stopped, and the air outlet valve returns to a normal state.

[0051] In one embodiment, a plurality of groups of limit rods 1524 are fixedly connected to the circumferential surface of the inner sleeve 152, and a plurality of groups of limit grooves matched with the limit rods 1524 are provided on the inner wall of the outer sleeve 151 to allow the inner sleeve 152 to move up and down; the structure of the limit rods 1524 and the limit grooves can enhance the stability of the inner sleeve 152 during the up and down movement. During operation, the capacitor may be disturbed by external vibrations, impacts, etc., and the cooperation between the limit rods 1524 and the limit grooves can prevent the inner sleeve 152 from being deflected, shaken, tilted, or other unstable conditions. This is very important for maintaining the normal operation of the air outlet valve 15, because if the inner sleeve 152 is deflected, the air outlet hole 1511 and the air outlet hole 2 1523 may not be aligned normally, thereby affecting the pressure relief function and may even damage the air outlet valve 15.

[0052] In one embodiment, the elastic sealing member includes an insulating sealing plug 13 slidably arranged in a slide groove 111, and a spring 14 is arranged between the top of the insulating sealing plug 13 and the slide groove 111. The insulating sealing plug 13 can slide in the slide groove 111 of the cover body 11. When the capacitor is working normally, the internal air pressure is stable. At this time, the elastic force of the spring 14 causes the insulating sealing plug 13 to seal the connecting pipe 114, and the air inlet end of the pressure relief member is in an open state. When the air pressure inside the capacitor increases due to overload, overheating, etc., the gas generates an upward pressure on the insulating sealing plug 13. When this pressure is sufficient to overcome the elastic force of the spring 14, the insulating sealing plug 13 will slide upward along the slide groove 111. This upward sliding will change the position of the insulating sealing plug 13, thereby sealing the air inlet end of the pressure relief member and opening the connecting pipe 114 at the same time, so that the gas storage tank 110 is disconnected from the pressure relief member, and the gas mainly enters the gas storage tank 110 for buffering, thereby avoiding the gas directly entering the pressure relief member and causing a sudden change in pressure.

[0053] In one embodiment, a truncated cone-shaped enlarged portion 121 is provided at the bottom of the terminal 12, and a connecting plate 23 is fixedly connected to each group of the conductor rods 22 and located above the partition 21, and a connecting hole 231 adapted to the enlarged portion 121 is opened on the connecting plate 23, and a plurality of groups of elastic connecting sheets 232 are provided in the connecting hole 231, and the minimum diameter of the enlarged portion 121 is greater than the diameter of the terminal 12;

[0054] The multiple groups of elastic connecting pieces 232 play a key role in the connecting hole 231. When the enlarged portion 121 is inserted into the connecting hole 231, the elastic connecting piece 232 will undergo elastic deformation, thereby tightly fitting on the surface of the enlarged portion 121. This tight fit can not only ensure a good electrical connection, so that the current can be smoothly transmitted from the terminal 12 to the conductor rod 22, but also when the air pressure inside the capacitor increases, the conductor rod 22 drives the connecting plate 23 to move upward, and the connecting hole 231 of the connecting plate 23 is separated from the terminal 12, so that the capacitor stops working, thereby preventing the capacitor from continuing to heat up or even bursting. When the conductor rod 22 moves downward, the conductor rod 22 is reconnected to the terminal 12 through the connecting plate 23. When the enlarged portion 121 is inserted into the connecting hole 231, the elastic connecting piece 232 will undergo elastic deformation, thereby tightly fitting. The surface of the expanded portion 121 can ensure a good electrical connection, so that the current can be smoothly transmitted from the terminal 12 to the conductor rod 22, and the mechanical stability of the connection can be enhanced to prevent the terminal 12 and the conductor rod 22 from loosening or detaching due to vibration, shaking and other factors. In order to prevent the connecting plate 23 from closing the port of the slide groove 111 and failing to release pressure in time, a limit ring 30 is provided at the bottom of the cover body 11 and between the two groups of slide grooves 111, so that after the connecting plate 23 rises, there is a gap between the connecting plate 23 and the slide groove 111 to facilitate the entry of gas.

[0055] Embodiment 2

[0056] Application of the polypropylene film dielectric composite capacitor in Example 1 in electronic circuits.

[0057] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them.

Claims

1. Polypropylene film dielectric composite capacitor, characterized in that: include: A housing (10), the housing (10) comprising an upper cylinder and a lower cylinder; A core body (20) is arranged in the lower cylinder body, two groups of conductor rods (22) are arranged on the top of the core body (20), a partition plate (21) is connected between the two groups of conductor rods (22), and the partition plate (21) can seal the lower cylinder body; A cover body (11) is arranged on the top of the upper cylinder body, and the cover body (11) is provided with slide grooves (111) corresponding to the number and position of the conductor rods (22). An annular gas storage tank (110) is arranged on the cover body (11) and outside the two groups of slide grooves (111). The slide groove (111) is connected to the gas storage tank (110) near the bottom through a connecting pipe (114), and the slide groove (111) is connected to the gas storage tank (110) near the top through a connecting channel (113); Binding posts (12) are arranged on the cover body (11), two groups of the binding posts (12) are arranged, and the binding posts (12) are electrically connected to the conductor rod (22); A pressure relief member is arranged in the cover body (11), the pressure relief member has an air inlet end and an air outlet end, the air inlet end is connected to the slide groove (111), and the air inlet end is located between the connecting pipe (114) and the connecting channel (113); An elastic seal is arranged in the slide groove (111), the top of the conductor rod (22) extends into the slide groove (111) and abuts against the bottom of the elastic seal, the elastic seal has a first state and a second state, and the elastic seal can switch between the first state and the second state; The first state: the elastic sealing member moves upward to seal the air inlet end of the pressure relief member, and the connecting pipe (114) is opened to control the air storage tank 1 (110) and the pressure relief member to be in a disconnected state. The second state: the elastic sealing member moves downward to seal the connecting pipe (114), and the air inlet end of the pressure relief member is opened, so that the air storage tank 1 (110) is controlled to be in a connected state with the pressure relief member through the slide groove (111).

2. The polypropylene film dielectric composite capacitor according to claim 1, characterized in that: The elastic sealing component comprises an insulating sealing plug (13) slidably arranged in a sliding groove (111), and a spring (14) is arranged between the top of the insulating sealing plug (13) and the sliding groove (111).

3. The polypropylene film dielectric composite capacitor according to claim 2, characterized in that: The pressure relief component comprises an annular air storage tank (112) disposed inside the cover body (11) and located between the two groups of slide grooves (111); an air inlet end of the air storage tank (112) is connected to the slide groove (111) via a pipeline; the pipeline is located between the connecting passage (113) and the connecting pipe (114); an air outlet is disposed at the top of the cover body (11) and located above the air storage tank (112); an air outlet valve (15) is disposed at the top of the air outlet.

4. The polypropylene film dielectric composite capacitor according to claim 3, characterized in that: The air outlet valve (15) comprises an outer sleeve (151) fixedly arranged on the cover body (11) and located above the air outlet, the outer sleeve (151) has a plurality of groups of first air outlet holes (1511) on its circumferential surface, an inner sleeve (152) is slidably connected inside the outer sleeve (151), a gap is provided between the top of the inner sleeve (152) and the top of the inner wall of the outer sleeve (151), the surface of the inner sleeve (152) has a plurality of groups of second air outlet holes (1523), the bottom of the inner sleeve (152) has two groups of air inlet holes (1521), and the spacing between the two groups of air inlet holes (1521) is greater than the diameter of the air outlet.

5. The polypropylene film dielectric composite capacitor according to claim 4, characterized in that: Under the action of gravity of the inner sleeve (152), the air outlet hole 1 (1511) and the air outlet hole 2 (1523) are in a staggered state, and the height of the gap is equal to the distance between the center line of the air outlet hole 1 (1511) and the center line of the air outlet hole 2 (1523).

6. The polypropylene film dielectric composite capacitor according to claim 5, characterized in that: A dust cover (1522) is provided at the bottom of the inner wall of the inner sleeve (152), and the dust cover divides the cavity of the inner sleeve (152) into chamber one and chamber two from the inside to the outside. The top of the dust cover is open to allow chamber one and chamber two to communicate with each other. The height of the dust cover (1522) is greater than the position of the highest group of air outlet holes two (1523), and the height of the dust cover (1522) is less than the height of the inner sleeve (152).

7. The polypropylene film dielectric composite capacitor according to claim 1, characterized in that: The bottom of the terminal post (12) is provided with an enlarged portion (121) of a truncated cone structure, and a connecting plate (23) is fixedly connected to each group of the conductor rods (22) and located above the partition (21), and the connecting plate (23) is provided with a connecting hole (231) adapted to the enlarged portion (121), and a plurality of groups of elastic connecting sheets (232) are arranged in the connecting hole (231), and the minimum diameter of the enlarged portion (121) is greater than the diameter of the terminal post (12).

8. Use of the polypropylene film dielectric composite capacitor according to any one of claims 1 to 7 in an electronic circuit.

Images