An explosion-proof block, end cap and capacitor

Abstract

The utility model provides a kind of explosion-proof block, end cover and film capacitor, including explosion-proof block body, air hole, installation cavity, wiring hole and partition block, the installation cavity shape is same with insulating paperboard shape, it is set in the explosion-proof block body inside;The wiring hole number is two, symmetrically set in the explosion-proof block body top;The air hole is opened in the wiring hole circumferential side;The partition block is L-shaped and is set between two the wiring hole.The utility model changes the appearance structure of explosion-proof block, internal installation cavity and insulating paperboard shape are consistent, make wall thickness uniformity improve, reduce the dosage of material, improve safety distance etc.;And increase L-shaped partition block in the front of explosion-proof block body, effectively insulate capacitor core and welding point contact, increase the creepage distance between core and welding point & electrode, electrical clearance etc.

Description

Technical Field

[0001] This utility model relates to the field of capacitor technology, and in particular to an explosion-proof block, end cap, and film capacitor. Background Technology

[0002] The dual-carbon policy is driving the rapid development of the new energy market (new energy vehicles, photovoltaics, and wind power), and the traditional home appliance industry is also actively responding to the call. Capacitors are components that can store electrical charge and are among the most commonly used electronic components in the home appliance industry, widely used in DC blocking, coupling, bypassing, filtering, tuning circuits, energy conversion, and control circuits. While maintaining excellent performance, capacitor manufacturing costs and internal structures are also being updated and improved.

[0003] The applicant has discovered at least the following technical problems with the existing technology: The capacitor includes an end cap; the end cap is mainly composed of an explosion-proof block, insulating cardboard, terminal pins, a sealing ring, and a cover plate. Since the main body is built into the explosion-proof block, the block needs to be hollowed out. However, the existing crescent-shaped explosion-proof block has a complex internal shape, making it difficult to control the uniformity of the internal groove wall thickness. Furthermore, due to the large size of the crescent-shaped explosion-proof block, there is uneven stress distribution. To solve this, the wall thickness needs to be increased at the crescent (1.8mm at the conventional location, 8.61mm at the crescent), resulting in the use of more PBT material and higher costs. To ensure the creepage distance between the gold-plated core surface and the end cap weld, an insulating sleeve is required, which is also costly.

[0004] Therefore, reducing the manufacturing cost of explosion-proof blocks while ensuring the safety of the internal electrical structure is the primary goal of current capacitor research and development. Utility Model Content

[0005] The purpose of this invention is to provide an explosion-proof block, end cap, and film capacitor to solve the aforementioned technical problems in the prior art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: In a first aspect, this utility model provides an explosion-proof block, comprising an explosion-proof block body, vent holes, a mounting cavity, wiring holes, and partitions, wherein: The mounting cavity has the same shape as the insulating cardboard and is located inside the explosion-proof block body; The number of wiring holes is two, symmetrically arranged on the top of the explosion-proof block body; The ventilation holes are formed around the wiring holes; The spacer is L-shaped and positioned between the two wiring holes.

[0007] The explosion-proof block provided by this utility model changes the shape and structure of the explosion-proof block. The internal mounting cavity is consistent with the shape of the insulating cardboard, which improves the uniformity of the wall thickness, reduces the amount of material used, and increases the safety distance. An L-shaped partition is added to the front of the explosion-proof block body to effectively isolate the capacitor core from the welding point, increase the creepage distance and electrical clearance between the core and the welding point and electrode.

[0008] Based on the above technical solution, the present invention can be further improved as follows.

[0009] As a further improvement of this utility model, the vent hole is an elongated waist-shaped hole.

[0010] This invention features an elongated, waist-shaped vent hole on the explosion-proof block. During normal use of the capacitor, the filling oil can fully enter the explosion-proof block, providing protection such as heat dissipation, prevention of metal oxidation, and impregnation of plastic parts to prevent aging. In the event of core failure and gas release, the gas can quickly enter the explosion-proof block through the vent hole, rapidly achieving the explosion-proof effect of disconnecting the terminal pins from the solder joints, thus more effectively ensuring the safety of the S2 explosion-proof product.

[0011] As a further improvement of this utility model, the number of vent holes is four, of which two vent holes are located at the two ends of the diagonal of the explosion-proof block body; the other two vent holes are located in the middle of the two wiring holes and are symmetrically arranged on both sides of the explosion-proof block body.

[0012] This invention features four ventilation holes located at both ends of the diagonal and the middle of the explosion-proof block body. During normal use of the capacitor, the filling oil can quickly and fully enter the explosion-proof block, providing rapid heat dissipation, preventing metal oxidation, and wetting the plastic parts to prevent aging. In the event of core failure and gas release, the gas can be evenly injected into the explosion-proof block through the four holes, more effectively achieving the explosion-proof effect of disconnecting the terminal pins from the solder joints, and more effectively ensuring the safety of the S2 explosion-proof product.

[0013] As a further improvement of this utility model, the number of the spacers is two sets, which have a rotationally symmetrical structure and are respectively arranged on the side of the wiring hole facing the other wiring hole.

[0014] This invention provides L-shaped spacers between the wiring holes and inside the vent holes. These spacers increase the gap between the core and the solder joint, preventing insufficient creepage distance between the core and the solder joint during energization and thus avoiding internal arcing without the use of an upper insulating sleeve.

[0015] As a further improvement of this utility model, the line connecting the two ends of the two air holes in the middle is located between the two partitions.

[0016] As a further improvement of this utility model, the partition includes a first partition and a second partition, wherein the outer edge of the first partition is flush with the inner edge of one of the ventilation holes located in the middle; and the end of the second partition is flush with the inner edge of the other ventilation hole located in the middle.

[0017] As a further improvement of this utility model, both the first partition and the second partition are cuboid structures.

[0018] As a further improvement of this utility model, the explosion-proof block body is made of PPS material.

[0019] The explosion-proof block of this utility model, by changing the material of the explosion-proof block from PBT to the stronger PPS, effectively increases the rigidity and resistance to welding heat of the explosion-proof block, and effectively prevents the problem of probabilistic failure of destructive tests due to damage to the explosion-proof block.

[0020] Secondly, the present invention provides an end cap including the explosion-proof block.

[0021] Thirdly, the present invention provides a capacitor including the aforementioned end cap.

[0022] As a further improvement of this utility model, the capacitor is a cylindrical metallized film capacitor. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a top view of the explosion-proof block of this utility model; Figure 2 yes Figure 1 Sectional view along the AA direction; Figure 3 This is a bottom view of the explosion-proof block of this utility model; Figure 4 This is a three-dimensional structural diagram of the explosion-proof block of this utility model.

[0025] In the picture: 1. Explosion-proof block body; 2. Wiring holes; 3. Ventilation holes; 4. Spacers; 41. First partition; 42. Second partition; 5. Installation cavity. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0027] Example 1:

[0028] like Figures 1-4 As shown, this utility model provides an explosion-proof block for cylindrical film capacitors, including an explosion-proof block body 1, a vent 3, a mounting cavity 5, a wiring hole 2, and a partition 4, wherein: The explosion-proof block body 1 has a rectangular structure with outward-protruding arc-shaped structures at both ends. By changing the shape of the waisted double crescent-shaped explosion-proof block body 1 to a long strip with outward-protruding arc-shaped sides, the wall thickness of conventional crescent-shaped explosion-proof blocks is strengthened at the tip, which is prone to stress concentration and premature breakage during explosion-proof operation. Conventional crescent-shaped explosion-proof blocks have a wall thickness of 6.1mm-8.4mm at the tip, while the wall thickness at the other end is only 1.7mm-2.1mm. After modifying the shape to a long strip with an outward-protruding structure, the stress is evenly distributed to both ends when subjected to force, eliminating stress concentration at the tip. The wall thickness is changed to a uniform 1.7mm, reducing material usage by 30% and significantly reducing costs. The mounting cavity 5 has the same shape as the insulating cardboard and is located inside the explosion-proof block body 1; There are two wiring holes 2, which are symmetrically arranged on the top of the explosion-proof block body 1; the wiring holes 2 are also the solder joint positions on the explosion-proof block. The vent 3 is opened on the periphery of the wiring hole 2; by designing the vent 3 on the periphery of the welding point, when the core fails and releases gas, the gas can fully enter the explosion-proof block, providing sufficient gas pressure to separate the terminal pin and the welding pad, thus ensuring the effectiveness of the S2 explosion-proof. The spacer 4 is L-shaped and positioned between the two wiring holes 2. By designing the L-shaped spacer 4 on the flat surface of the explosion-proof block, this design ensures that after the core is installed in the aluminum shell, the creepage distance between the gold plating layer and the welded joint on the upper surface of the core meets safety standards, whether the core is upright or inverted. This prevents electrical arcing and discharge during power-on use, and avoids premature failure of inverted products due to non-compliance with design life ratings. Furthermore, this design eliminates the need for a commonly used upper insulating sleeve, reducing PP material consumption and providing significant cost reduction potential.

[0029] The explosion-proof block provided by this utility model changes the shape and structure of the explosion-proof block. The internal mounting cavity 5 is consistent with the shape of the insulating cardboard, which improves the uniformity of the wall thickness, reduces the amount of material used, and increases the safety distance. An L-shaped partition 4 is added to the front of the explosion-proof block body 1 to effectively isolate the capacitor core from the welding point, increase the creepage distance and electrical clearance between the core and the welding point & electrode.

[0030] As an optional embodiment of this utility model, the vent 3 is an elongated waist-shaped vent.

[0031] This invention features an elongated, waist-shaped vent hole 3 on the explosion-proof block. During normal use of the capacitor, the filling oil can fully enter the explosion-proof block, providing protection such as heat dissipation, prevention of metal oxidation, and impregnation of plastic parts to prevent aging. When the core fails and releases gas, the gas can quickly enter the explosion-proof block through the vent hole 3, rapidly achieving the explosion-proof effect of disconnecting the terminal pins from the solder joints, thus more effectively ensuring the safety of the S2 explosion-proof product.

[0032] By setting the vent 3 in an oblong shape, a larger guiding path is formed in the length direction, allowing the gas formed after the capacitor core is deflated to enter the explosion-proof block more quickly and evenly, improving the gas pressure transmission efficiency and the gas guiding efficiency.

[0033] As a further improvement of this utility model, the number of vent holes 3 is four, of which two vent holes 3 are located at the two ends of the diagonal of the explosion-proof block body 1; the other two vent holes 3 are located in the middle of the two wiring holes 2 and are symmetrically arranged on both sides of the explosion-proof block body 1.

[0034] By setting four asymmetrical vent holes 3, this layout achieves uniform distribution of explosion-proof pressure: when the core is vented, the gas can diffuse synchronously in multiple directions, effectively preventing structural damage caused by excessive local pressure.

[0035] This invention features four ventilation holes 3 located at the two diagonal ends and the middle of the explosion-proof block body 1. During normal use of the capacitor, the filling oil can quickly and fully enter the explosion-proof block, providing protection such as heat dissipation, prevention of metal oxidation, and wetting of plastic parts to prevent aging. When the core fails and releases gas, the gas can be evenly injected into the explosion-proof block through the four holes, more effectively achieving the explosion-proof effect of disconnecting the terminal pins from the solder joints, and more effectively ensuring the safety of the S2 explosion-proof product.

[0036] As a further improvement of this utility model, the number of the partition blocks 4 is two sets, which have a rotationally symmetrical structure and are respectively arranged on the side of the wiring hole 2 facing the other wiring hole 2.

[0037] This invention provides an L-shaped spacer 4 between the wiring holes 2 and inside the vent hole 3. This spacer 4 increases the gap between the core and the welding point, and can prevent insufficient creepage distance between the core and the welding point during power-on without using an upper insulating sleeve, thus avoiding internal arcing.

[0038] The L-shaped spacer, with its corner structure, can form a bent electrical isolation path by coordinating with the spatial layout of the wiring holes and welding points. This extends the creepage path and improves electrical insulation performance without increasing material or volume. The L-shaped structure forms a barrier between the conductive path and the gas release direction, effectively guiding the gas diffusion direction and preventing the gas flow from concentrating and impacting the electrode area during overpressure.

[0039] As a further improvement of this utility model, the line connecting the two ends of the two ventilation holes 3 located in the middle is located between the two partition blocks 4.

[0040] As a further improvement of this utility model, the partition 4 includes a first partition 41 and a second partition 42. The outer edge of the first partition 41 is flush with the inner edge of one of the ventilation holes 3 located in the middle; the end of the second partition 42 is flush with the inner edge of the other ventilation hole 3 located in the middle.

[0041] As a further improvement of this utility model, both the first partition 41 and the second partition 4 are cuboid structures.

[0042] As a further improvement of this utility model, the explosion-proof block body 1 is made of PPS material.

[0043] The explosion-proof block of this utility model, by changing the material of the explosion-proof block from PBT to the stronger PPS, effectively increases the rigidity and resistance to welding heat of the explosion-proof block, and effectively prevents the problem of probabilistic failure of destructive tests due to damage to the explosion-proof block.

[0044] Furthermore, all sharp points of the explosion-proof block body are rounded to prevent cracking of the explosion-proof block due to weak points during the pressure application process of explosion-proof action, which would lead to explosion-proof failure.

[0045] Example 2:

[0046] like Figures 1-4 As shown, the present invention provides an end cap including the explosion-proof block.

[0047] Furthermore, the explosion-proof block includes an explosion-proof block body 1, a vent 3, a mounting cavity 5, a wiring hole 2, and a partition 4, wherein: The explosion-proof block body 1 has a rectangular structure with outward-protruding arc-shaped structures at both ends. By changing the shape of the waisted double crescent-shaped explosion-proof block body 1 to a long strip with outward-protruding arc-shaped sides, the wall thickness of conventional crescent-shaped explosion-proof blocks is strengthened at the tip, which is prone to stress concentration and premature breakage during explosion-proof operation. Conventional crescent-shaped explosion-proof blocks have a wall thickness of 6.1mm-8.4mm at the tip, while the wall thickness at the other end is only 1.7mm-2.1mm. After modifying the shape to a long strip with an outward-protruding structure, the stress is evenly distributed to both ends when subjected to force, eliminating stress concentration at the tip. The wall thickness is changed to a uniform 1.7mm, reducing material usage by 30% and significantly reducing costs. The mounting cavity 5 has the same shape as the insulating cardboard and is located inside the explosion-proof block body 1; There are two wiring holes 2, which are symmetrically arranged on the top of the explosion-proof block body 1; the wiring holes 2 are also the solder joint positions on the explosion-proof block. The vent 3 is opened on the periphery of the wiring hole 2; by designing the vent 3 on the periphery of the welding point, when the core fails and releases gas, the gas can fully enter the explosion-proof block, providing sufficient gas pressure to separate the terminal pin and the welding pad, thus ensuring the effectiveness of the S2 explosion-proof. The spacer 4 is L-shaped and positioned between the two wiring holes 2. By designing the L-shaped spacer 4 on the flat surface of the explosion-proof block, this design ensures that after the core is installed in the aluminum shell, the creepage distance between the gold plating layer and the welded joint on the upper surface of the core meets safety standards, whether the core is upright or inverted. This prevents electrical arcing and discharge during power-on use, and avoids premature failure of inverted products due to non-compliance with design life ratings. Furthermore, this design eliminates the need for a commonly used upper insulating sleeve, reducing PP material consumption and providing significant cost reduction potential.

[0048] The explosion-proof block provided by this utility model changes the shape and structure of the explosion-proof block. The internal mounting cavity 5 is consistent with the shape of the insulating cardboard, which improves the uniformity of the wall thickness, reduces the amount of material used, and increases the safety distance. An L-shaped partition 4 is added to the front of the explosion-proof block body 1 to effectively isolate the capacitor core from the welding point, increase the creepage distance and electrical clearance between the core and the welding point & electrode.

[0049] As an optional embodiment of this utility model, the vent 3 is an elongated waist-shaped vent.

[0050] This invention features an elongated, waist-shaped vent hole 3 on the explosion-proof block. During normal use of the capacitor, the filling oil can fully enter the explosion-proof block, providing protection such as heat dissipation, prevention of metal oxidation, and impregnation of plastic parts to prevent aging. When the core fails and releases gas, the gas can quickly enter the explosion-proof block through the vent hole 3, rapidly achieving the explosion-proof effect of disconnecting the terminal pins from the solder joints, thus more effectively ensuring the safety of the S2 explosion-proof product.

[0051] As a further improvement of this utility model, the number of vent holes 3 is four, of which two vent holes 3 are located at the two ends of the diagonal of the explosion-proof block body 1; the other two vent holes 3 are located in the middle of the two wiring holes 2 and are symmetrically arranged on both sides of the explosion-proof block body 1.

[0052] This invention features four ventilation holes 3 located at the two diagonal ends and the middle of the explosion-proof block body 1. During normal use of the capacitor, the filling oil can quickly and fully enter the explosion-proof block, providing protection such as heat dissipation, prevention of metal oxidation, and wetting of plastic parts to prevent aging. When the core fails and releases gas, the gas can be evenly injected into the explosion-proof block through the four holes, more effectively achieving the explosion-proof effect of disconnecting the terminal pins from the solder joints, and more effectively ensuring the safety of the S2 explosion-proof product.

[0053] As a further improvement of this utility model, the number of the partition blocks 4 is two sets, which have a rotationally symmetrical structure and are respectively arranged on the side of the wiring hole 2 facing the other wiring hole 2.

[0054] This invention provides an L-shaped spacer 4 between the wiring holes 2 and inside the vent hole 3. This spacer 4 increases the gap between the core and the welding point, and can prevent insufficient creepage distance between the core and the welding point during power-on without using an upper insulating sleeve, thus avoiding internal arcing.

[0055] As a further improvement of this utility model, the line connecting the two ends of the two ventilation holes 3 located in the middle is located between the two partition blocks 4.

[0056] As a further improvement of this utility model, the partition 4 includes a first partition 41 and a second partition 42. The outer edge of the first partition 41 is flush with the inner edge of one of the ventilation holes 3 located in the middle; the end of the second partition 42 is flush with the inner edge of the other ventilation hole 3 located in the middle.

[0057] As a further improvement of this utility model, both the first partition 41 and the second partition 4 are cuboid structures.

[0058] As a further improvement of this utility model, the explosion-proof block body 1 is made of PPS material.

[0059] The explosion-proof block of this utility model, by changing the material of the explosion-proof block from PBT to the stronger PPS, effectively increases the rigidity and resistance to welding heat of the explosion-proof block, and effectively prevents the problem of probabilistic failure of destructive tests due to damage to the explosion-proof block.

[0060] Furthermore, all sharp points of the explosion-proof block body are rounded to prevent cracking of the explosion-proof block due to weak points during the pressure application process of explosion-proof action, which would lead to explosion-proof failure.

[0061] The explosion-proof block in the end cap of this invention ensures that the film capacitor has an S2 explosion-proof rating while reducing the consumption of PBT and the use of the upper PP insulating sleeve.

[0062] Example 3:

[0063] like Figures 1-4 As shown, the present invention provides a cylindrical metallized film capacitor, including the end cap.

[0064] Furthermore, the end cap includes the explosion-proof block, which includes an explosion-proof block body 1, a vent 3, a mounting cavity 5, a wiring hole 2, and a partition 4, wherein: The explosion-proof block body 1 has a rectangular structure with outward-protruding arc-shaped structures at both ends. By changing the shape of the waisted double crescent-shaped explosion-proof block body 1 to a long strip with outward-protruding arc-shaped sides, the wall thickness of conventional crescent-shaped explosion-proof blocks is strengthened at the tip, which is prone to stress concentration and premature breakage during explosion-proof operation. Conventional crescent-shaped explosion-proof blocks have a wall thickness of 6.1mm-8.4mm at the tip, while the wall thickness at the other end is only 1.7mm-2.1mm. After modifying the shape to a long strip with an outward-protruding structure, the stress is evenly distributed to both ends when subjected to force, eliminating stress concentration at the tip. The wall thickness is changed to a uniform 1.7mm, reducing material usage by 30% and significantly reducing costs. The mounting cavity 5 has the same shape as the insulating cardboard and is located inside the explosion-proof block body 1; There are two wiring holes 2, which are symmetrically arranged on the top of the explosion-proof block body 1; the wiring holes 2 are also the solder joint positions on the explosion-proof block. The vent 3 is opened on the periphery of the wiring hole 2; by designing the vent 3 on the periphery of the welding point, when the core fails and releases gas, the gas can fully enter the explosion-proof block, providing sufficient gas pressure to separate the terminal pin and the welding pad, thus ensuring the effectiveness of the S2 explosion-proof. The spacer 4 is L-shaped and positioned between the two wiring holes 2. By designing the L-shaped spacer 4 on the flat surface of the explosion-proof block, this design ensures that after the core is installed in the aluminum shell, the creepage distance between the gold plating layer and the welded joint on the upper surface of the core meets safety standards, whether the core is upright or inverted. This prevents electrical arcing and discharge during power-on use, and avoids premature failure of inverted products due to non-compliance with design life ratings. Furthermore, this design eliminates the need for a commonly used upper insulating sleeve, reducing PP material consumption and providing significant cost reduction potential.

[0065] The explosion-proof block provided by this utility model changes the shape and structure of the explosion-proof block. The internal mounting cavity 5 is consistent with the shape of the insulating cardboard, which improves the uniformity of the wall thickness, reduces the amount of material used, and increases the safety distance. An L-shaped partition 4 is added to the front of the explosion-proof block body 1 to effectively isolate the capacitor core from the welding point, increase the creepage distance and electrical clearance between the core and the welding point & electrode.

[0066] As an optional embodiment of this utility model, the vent 3 is an elongated waist-shaped vent.

[0067] This invention features an elongated, waist-shaped vent hole 3 on the explosion-proof block. During normal use of the capacitor, the filling oil can fully enter the explosion-proof block, providing protection such as heat dissipation, prevention of metal oxidation, and impregnation of plastic parts to prevent aging. When the core fails and releases gas, the gas can quickly enter the explosion-proof block through the vent hole 3, rapidly achieving the explosion-proof effect of disconnecting the terminal pins from the solder joints, thus more effectively ensuring the safety of the S2 explosion-proof product.

[0068] As a further improvement of this utility model, the number of vent holes 3 is four, of which two vent holes 3 are located at the two ends of the diagonal of the explosion-proof block body 1; the other two vent holes 3 are located in the middle of the two wiring holes 2 and are symmetrically arranged on both sides of the explosion-proof block body 1.

[0069] This invention features four ventilation holes 3 located at the two diagonal ends and the middle of the explosion-proof block body 1. During normal use of the capacitor, the filling oil can quickly and fully enter the explosion-proof block, providing protection such as heat dissipation, prevention of metal oxidation, and wetting of plastic parts to prevent aging. When the core fails and releases gas, the gas can be evenly injected into the explosion-proof block through the four holes, more effectively achieving the explosion-proof effect of disconnecting the terminal pins from the solder joints, and more effectively ensuring the safety of the S2 explosion-proof product.

[0070] As a further improvement of this utility model, the number of the partition blocks 4 is two sets, which have a rotationally symmetrical structure and are respectively arranged on the side of the wiring hole 2 facing the other wiring hole 2.

[0071] This invention provides an L-shaped spacer 4 between the wiring holes 2 and inside the vent hole 3. This spacer 4 increases the gap between the core and the welding point, and can prevent insufficient creepage distance between the core and the welding point during power-on without using an upper insulating sleeve, thus avoiding internal arcing.

[0072] As a further improvement of this utility model, the line connecting the two ends of the two ventilation holes 3 located in the middle is located between the two partition blocks 4.

[0073] As a further improvement of this utility model, the partition 4 includes a first partition 41 and a second partition 42. The outer edge of the first partition 41 is flush with the inner edge of one of the ventilation holes 3 located in the middle; the end of the second partition 42 is flush with the inner edge of the other ventilation hole 3 located in the middle.

[0074] As a further improvement of this utility model, both the first partition 41 and the second partition 4 are cuboid structures.

[0075] As a further improvement of this utility model, the explosion-proof block body 1 is made of PPS material.

[0076] The explosion-proof block of this utility model, by changing the material of the explosion-proof block from PBT to the stronger PPS, effectively increases the rigidity and resistance to welding heat of the explosion-proof block, and effectively prevents the problem of probabilistic failure of destructive tests due to damage to the explosion-proof block.

[0077] Furthermore, all sharp points of the explosion-proof block body are rounded to prevent cracking of the explosion-proof block due to weak points during the pressure application process of explosion-proof action, which would lead to explosion-proof failure.

[0078] The explosion-proof block in the end cap of this invention ensures that the film capacitor has an S2 explosion-proof rating while reducing the consumption of PBT and the use of the upper PP insulating sleeve.

[0079] First, it should be noted that "inward" refers to the direction towards the center of the storage space, while "outward" refers to the direction away from the center of the storage space.

[0080] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the appendix. Figure 1 The orientations or positional relationships shown are for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0081] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0082] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0083] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0084] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0085] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. An explosion-proof block, characterized in that, It includes the explosion-proof block body, vent holes, mounting cavity, wiring hole and partition, wherein: The mounting cavity has the same shape as the insulating cardboard and is located inside the explosion-proof block body; The number of wiring holes is two, symmetrically arranged on the top of the explosion-proof block body; The ventilation holes are formed around the wiring holes; The spacer is L-shaped and positioned between the two wiring holes.

2. The explosion-proof block according to claim 1, characterized in that, The ventilation hole is a long, narrow, waist-shaped hole.

3. The explosion-proof block according to claim 1, characterized in that, The number of vent holes is four, two of which are located at the two ends of the diagonal of the explosion-proof block body; the other two vent holes are located in the middle of the two wiring holes and are symmetrically arranged on both sides of the explosion-proof block body.

4. The explosion-proof block according to claim 3, characterized in that, The number of spacers is two sets, which have a rotationally symmetrical structure and are respectively set on the side of the wiring hole facing the other wiring hole.

5. The explosion-proof block according to claim 4, characterized in that, The line connecting the two ends of the two vent holes located in the middle is located between the two partitions.

6. The explosion-proof block according to claim 5, characterized in that, The partition includes a first partition and a second partition, wherein the outer edge of the first partition is flush with the inner edge of one of the ventilation holes located in the middle; and the end of the second partition is flush with the inner edge of the other ventilation hole located in the middle.

7. The explosion-proof block according to claim 6, characterized in that, Both the first partition and the second partition are cuboid structures.

8. The explosion-proof block according to claim 1, characterized in that, The explosion-proof block body is made of PPS material.

9. An end cap, characterized in that, Includes the explosion-proof block as described in any one of claims 1-8.

10. A capacitor, characterized in that, Includes the end cap as described in claim 9.

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