Block-up TYPE-C connector

By setting the upper and lower terminals between the upper and lower terminals in the TYPE-C connector and fixing the welding foot with an insulating bending structure, the deformation problem of welding foot is solved, the product yield and stability are improved, and the application of different heights is adapted to need.

CN222282291UActive Publication Date: 2024-12-31JUST CONNECTOR KUSN
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Patent Information

Application Number
CN202420992171.6
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-05-09
Publication Date
2024-12-31
Estimated Expiration
2034-05-09

AI Technical Summary

Technical Problem

When existing TYPE-C connectors increase their height to meet special installation needs, the solder foot is prone to deform, resulting in high process defect rate.

Method used

Design a high-level TYPE-C connector, by setting the upper and lower terminals between the upper and lower terminals on the same plane, and fixing the welding foot through the bending structure of the insulating part to avoid deformation of the welding foot, and at the same time, the welding is fixed by injection molding. to ensure the stability of the welding site.

Benefits of technology

It effectively avoids deformation of welding feet, improves product yield and stability, and meets the needs of different products at a high level.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model belongs to the technical field of electric connectors, and discloses a heightened TYPE-C connector, which comprises a terminal group comprising an upper row of terminals, a lower row of terminals, a heightening part and a plugging part, the upper row of terminals and the lower row of terminals are arranged up and down at one end of the plugging part, a clamping piece is arranged between the upper row of terminals and the lower row of terminals, and a clamping piece is arranged between the upper row of terminals and the lower row of terminals at one end of the heightening part. The upper row of terminals and the lower row of terminals are arranged on the same plane, and the heightening part is bent relative to the plugging part; the first insulating part comprises a first plugging part insulating part and a first heightening part insulating part, the first plugging part insulating part is connected with the upper row of terminals, the lower row of terminals and the clamping pieces of the plugging part, and the first heightening part insulating part is connected with the upper row of terminals and the lower row of terminals of the heightening part; and the second insulating part is connected with the first plugging part insulating part and the first heightening part insulating part. According to the utility model, the first plugging part insulation part and the first heightening part insulation part are respectively used for fixing the terminals and then bending the terminals, and then the terminals are fixed through the second insulation part, so that the deformation of the weld legs is avoided, and the product yield is improved.
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Description

Technical Field

[0001] The utility model belongs to the technical field of electric connectors and relates to a pad-up type TYPE-C connector. Background Art

[0002] The USB TYPE-C connector is a USB interface standard that is smaller than TYPE-A and TYPE-B. It can be used in both PCs (host devices) and external devices (slave devices, such as mobile phones). USB TYPE-C has 4 pairs of TX / RX wires, 2 pairs of USBD+ / D-, a pair of SBU, 2 CCs, 4 VBUS and 4 ground wires.

[0003] The common TYPE-C base on the market has a limited height. In order to meet the special application scenario needs of customers and the installation height requirements of certain equipment, it is necessary to develop a high-height TYPE-C product. After the product height is increased, the height of the weld foot will be very long, which will cause the weld foot to deform during stamping, electroplating, injection molding and other processes, and the process defect rate is very high.

[0004] Based on this, the art urgently needs a raised TYPE-C connector to solve the above technical problems. Utility Model Content

[0005] In view of this, the purpose of the present invention is to solve the above-mentioned problem and provide a Type-C connector with a raised height that will not cause deformation of the terminal solder pins.

[0006] In order to solve the above technical problems, the utility model provides a pad-type TYPE-C connector, comprising:

[0007] A terminal group, the terminal group includes an upper row of terminals and a lower row of terminals, the terminal group includes a padding portion and a plug-in portion, at one end of the plug-in portion, the upper row of terminals and the lower row of terminals are arranged up and down, a clip is arranged between the upper row of terminals and the lower row of terminals, at one end of the padding portion, the upper row of terminals and the lower row of terminals are arranged in the same plane at intervals, and the padding portion is bent relative to the plug-in portion;

[0008] A first insulating portion, the first insulating portion comprising a first plug-in portion insulating portion and a first raised portion insulating portion, the first plug-in portion insulating portion fixedly connecting the upper row of terminals, the lower row of terminals and the clip of the plug-in portion, and the first raised portion insulating portion fixedly connecting the upper row of terminals and the lower row of terminals of the raised portion; and

[0009] The second insulating portion is fixedly connected to the relatively bent first plug-in portion insulating portion and the first raised portion insulating portion.

[0010] As a further improvement of the present invention, the insulating part of the first plug-in part is fixedly connected to the upper row of terminals, the lower row of terminals and the clip of the plug-in part by injection molding, the insulating part of the first raised part is fixedly connected to the upper row of terminals and the lower row of terminals of the raised part by injection molding, the second insulating part is fixedly connected to the insulating part of the first plug-in part and the insulating part of the first raised part by injection molding, clamping protrusions extending out of the upper row of terminals and the lower row of terminals are provided on both sides of the clip, and the first plug-in insulating part and the second insulating part are injection molded to connect the clamping protrusions to form a clamping part.

[0011] As a further improvement of the utility model, the upper row of terminals includes an upper contact portion, an upper fixing portion and an upper welding portion connected in sequence, the top surface of the upper contact portion exposes the front end upper surfaces of the first plug-in portion insulating portion and the second insulating portion, the upper fixing portion is fixed in the first insulating portion and the second insulating portion, and the upper welding portion vertically passes through the second insulating portion and horizontally extends out of the second insulating portion.

[0012] As a further improvement of the utility model, the lower row of terminals includes a lower contact portion, a lower fixing portion and a lower welding portion connected in sequence, the bottom surface of the lower contact portion exposes the front end lower surfaces of the first plug-in portion insulating portion and the second insulating portion, the lower fixing portion is fixed in the first insulating portion and the second insulating portion, and the lower welding portion vertically passes through the second insulating portion and horizontally extends out of the second insulating portion.

[0013] As a further improvement of the present invention, the elevated TYPE-C connector also includes a shielding shell, which includes an inner shell sleeved on the plug-in part and an outer shell sleeved on the inner shell and the elevated part. A buckle groove is provided on the end face of the second insulating part, and a buckle plate is provided on the inner shell corresponding to the buckle groove. The buckle plate is bent and extends into the buckle groove to be buckled and fixed.

[0014] As a further improvement of the present invention, a groove is provided on the upper surface of the second insulating portion, and a protrusion is provided on the inner shell body corresponding to the groove, and the protrusion extends into the groove for fixation.

[0015] As a further improvement of the present invention, the inner shell and the outer shell are fixedly connected by spot welding or riveting.

[0016] As a further improvement of the present invention, baffles bent inwardly are provided on both sides of the front end of the outer shell, the baffles are located below the inner shell, and the baffles are located in front of the raised portion.

[0017] As a further improvement of the present invention, abutment pieces extend from both sides of the rear end of the outer shell, and the second insulating portion is provided with abutment grooves corresponding to the abutment pieces, and the abutment pieces extend into the abutment grooves.

[0018] As a further improvement of the present invention, an inwardly bent elastic sheet is provided on the upper surface of the inner shell, and a protrusion is provided on the lower surface of the inner shell corresponding to the baffle.

[0019] The technical effect of the utility model is: compared with the prior art, the utility model provides a raised type TYPE-C connector, which avoids deformation of the terminal weld feet of the upper row of terminals or the lower row of terminals during material collection and electroplating transportation by arranging the upper row of terminals and the lower row of terminals at intervals in the same plane, and fixes and bends the upper row of terminals and the lower row of terminals of the raised part and the plug-in part respectively, and then fixes and connects the relatively bent first plug-in part insulation part and the first raised part insulation part through the second insulation part, so as to further fix the terminal weld feet of the upper row of terminals or the lower row of terminals, avoid deformation of the weld feet, and produce products without deformation problems, thereby improving product yield. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only part of the embodiments of the utility model, rather than all of the embodiments. For ordinary technicians in this field, without paying creative work, other drawings obtained based on these drawings all fall within the scope of protection of the utility model.

[0021] Figure 1 This is a three-dimensional view of a TYPE-C connector with a raised height provided by an embodiment of the utility model before bending;

[0022] Figure 2 This is a three-dimensional diagram of a TYPE-C connector after bending provided by an embodiment of the utility model;

[0023] Figure 3 It is a three-dimensional diagram of a raised TYPE-C connector provided by an embodiment of the utility model;

[0024] Figure 4 It is an exploded view of a pad-type TYPE-C connector provided by an embodiment of the utility model;

[0025] Figure 5 This is an exploded view from another angle of a raised TYPE-C connector provided in an embodiment of the utility model.

[0026] Among them, 10 is a terminal group, 11 is an upper row of terminals, 111 is an upper contact part, 112 is an upper fixing part, 113 is an upper welding part, 12 is a lower row of terminals, 121 is a lower contact part, 122 is a lower fixing part, 123 is a lower welding part, 13 is a raised part, 14 is a plug-in part, 20 is a first insulating part, 21 is an edge of the first plug-in part, 22 is an insulating part of the first raised part, 30 is a second insulating part, 31 is a buckle groove, 32 is a groove, 33 is an abutment groove, 41 is a clip, 411 is a clamping protrusion, 412 is a clamping part, 50 is a shielding shell, 51 is an inner shell, 511 is a buckle plate, 512 is a protrusion, 513 is a spring plate, 514 is a bump, 52 is an outer shell, 521 is a baffle, and 522 is an abutment plate. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0028] In order to make the description of the disclosed content more detailed and complete, the following is an illustrative description of the implementation method and specific examples of the utility model; however, this is not the only form of implementing or using the specific examples of the utility model. The implementation method covers the features of multiple specific examples and the method steps and their sequence for constructing and operating these specific examples. However, other specific examples can also be used to achieve the same or equal functions and step sequences. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0029] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0030] It should be understood that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein.

[0031] In the description of the present invention, the terms "front", "rear", "top", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0032] Please refer to Figure 1-Figure 5 The utility model provides a pad-type TYPE-C connector to solve the problem of how to avoid deformation of terminal welding feet.

[0033] For details, please refer to Figure 1 A three-dimensional view of a TYPE-C connector with a raised height provided in an embodiment of the utility model before being bent. Figure 2 A three-dimensional diagram of a raised TYPE-C connector after bending provided in an embodiment of the utility model, the utility model provides a raised TYPE-C connector, including a terminal group 10, the terminal group 10 including an upper row of terminals 11 and a lower row of terminals 12, the terminal group 10 including a raised portion 13 and a plug-in portion 14, at one end of the plug-in portion 14, the upper row of terminals 11 and the lower row of terminals 12 are arranged up and down, a clip 41 is arranged between the upper row of terminals 11 and the lower row of terminals 12, at one end of the raised portion 13, the upper row of terminals 11 and the lower row of terminals 12 are arranged in the same plane at intervals, and the raised portion 13 is bent relative to the plug-in portion 14; by arranging the upper row of terminals 11 and the lower row of terminals 12 into a planar structure, the upper row of terminals 11 and the lower row of terminals 12 will not be deformed during transportation.

[0034] Furthermore, it also includes a first insulating part 20, the first insulating part 20 includes a first plug-in part insulating part 21 and a first raised part insulating part 22, the first plug-in part insulating part 21 is fixedly connected to the upper row of terminals 11, the lower row of terminals 12 and the clip 41 of the plug-in part 14, and the first raised part insulating part 22 is fixedly connected to the upper row of terminals 11 and the lower row of terminals 12 of the raised part 13; it can be understood that there is a gap between the first plug-in part insulating part 21 and the first raised part insulating part 22, which is used to reserve a bending space for the raised part 13 to bend relative to the plug-in part 14, and

[0035] Furthermore, it also includes a second insulating portion 30, which is fixedly connected to the relatively bent first plug-in portion insulating portion 21 and the first raised portion insulating portion 22. It should be noted that the raised height of the raised TYPE-C connector can be adjusted by changing the height of the second insulating portion 30 in the direction of the first raised portion insulating portion 22. Therefore, the raised TYPE-C connector of this solution can be adjusted according to the height requirements of different products, and can simultaneously meet the needs of customers for raising different products.

[0036] The utility model provides a raised type TYPE-C connector, which avoids deformation of the terminal welding feet of the upper row of terminals 11 or the lower row of terminals 12 during the material collection and electroplating transportation process by arranging the upper row of terminals 11 and the lower row of terminals 12 at intervals in the same plane, and by arranging the first plug-in part insulating part 21 and the first raised part insulating part 22, the upper row of terminals 11 and the lower row of terminals 12 of the raised part 13 and the plug-in part 14 are fixed and bent respectively, and then the relatively bent first plug-in part insulating part 21 and the first raised part insulating part 22 are fixedly connected by the second insulating part 30, so as to further fix the terminal welding feet of the upper row of terminals 11 or the lower row of terminals 12, thereby avoiding deformation of the welding feet, and producing products without deformation problems, thereby improving product yield.

[0037] As a further improvement of the present invention, the first plug-in insulating part 21 is fixedly connected to the upper row of terminals 11, the lower row of terminals 12 and the clip 41 of the plug-in part 14 by injection molding, the first raised part insulating part 22 is fixedly connected to the upper row of terminals 11 and the lower row of terminals 12 of the raised part 13 by injection molding, the second insulating part 30 is fixedly connected to the first plug-in insulating part 21 and the first raised part insulating part 22 by injection molding, the two sides of the clip 41 are provided with clamping protrusions 411 extending out of the upper row of terminals 11 and the lower row of terminals 12, the first plug-in insulating part and the second insulating part 30 are connected by injection molding to form a clamping part 412. By setting the first plug-in insulating part and the second insulating part 30 to be connected by injection molding to form a clamping part 412, the connector can be clamped with the connection device when connected, avoiding loose connection and affecting the signal transmission effect.

[0038] As a further improvement of the present invention, the upper row terminal 11 comprises an upper contact portion 111, an upper fixing portion 112 and an upper welding portion 113 which are connected in sequence, the top surface of the upper contact portion 111 exposes the front upper surfaces of the first plug-in portion insulating portion 21 and the second insulating portion 30, the upper fixing portion 112 is fixed in the first insulating portion 20 and the second insulating portion 30, and the upper welding portion 113 vertically passes through the second insulating portion 30 and horizontally extends out of the second insulating portion 30. By setting the top surface of the upper contact portion 111 to expose the front upper surfaces of the first plug-in portion insulating portion 21 and the second insulating portion 30, the input and output effects when the upper row terminal 11 is connected are ensured, and by setting the upper welding portion 113 to vertically pass through the second insulating portion 30 and horizontally extend out of the second insulating portion 30, the fixing effect of the terminal of the welding portion of the upper row terminal 11 is ensured, deformation of the welding terminal is avoided, and the welding of the terminal of the welding portion of the upper row terminal 11 is facilitated.

[0039] As a further improvement of the present invention, the lower row terminal 12 comprises a lower contact portion 121, a lower fixing portion 122 and a lower welding portion 123 connected in sequence, the bottom surface of the lower contact portion 121 exposes the front lower surface of the first plug-in portion insulating portion 21 and the second insulating portion 30, the lower fixing portion 122 is fixed in the first insulating portion 20 and the second insulating portion 30, and the lower welding portion 123 vertically passes through the second insulating portion 30 and horizontally extends out of the second insulating portion 30. By setting the bottom surface of the lower contact portion 121 to expose the front lower surface of the first plug-in portion insulating portion 21 and the second insulating portion 30, the input and output effect when the lower row terminal 12 is connected is guaranteed, and by setting the lower welding portion 123 to vertically pass through the second insulating portion 30 and horizontally extend out of the second insulating portion 30, the fixing effect of the terminal of the welding portion of the lower row terminal 12 is guaranteed, the deformation of the welding terminal is avoided, and the welding of the terminal of the welding portion of the upper row terminal 11 is also facilitated.

[0040] As a further improvement of the present invention, see Figure 3-4The elevated TYPE-C connector further includes a shielding shell 50, which includes an inner shell 51 sleeved on the plug-in portion 14 and an outer shell 52 sleeved on the inner shell 51 and the elevated portion 13. The second insulating portion 30 has a buckle groove 31 on its end surface, and a buckle piece 511 is provided on the inner shell 51 corresponding to the buckle groove 31. The buckle piece 511 is bent and extends into the buckle groove 31 to be buckled and fixed. By providing the buckle groove 31 on the end surface of the second insulating portion 30, and providing the buckle piece 511 on the inner shell 51 corresponding to the buckle groove 31, and the buckle piece 511 is bent and extends into the buckle groove 31 to be buckled and fixed, the connection stability of the inner shell 51 is improved, and the inner shell 51 is prevented from sliding relative to or detaching from the second insulating portion 30 during the plugging and unplugging of the connector.

[0041] As a further improvement of the present invention, a groove 32 is provided on the upper surface of the second insulating part 30, and a protrusion 512 is provided on the inner housing 51 corresponding to the groove 32, and the protrusion 512 is inserted into the groove 32 for fixing. By providing the groove 32 on the upper surface of the second insulating part 30, providing the protrusion 512 on the inner housing 51 corresponding to the groove 32, and the protrusion 512 is inserted into the groove 32 for matching and fixing, the reliability of the connection between the inner housing 51 and the second insulating part 30 is further enhanced, the relative sliding between the inner housing 51 and the second insulating part 30 is avoided, and the stability of the pad-up TYPE-C connector is enhanced.

[0042] As a further improvement of the present invention, the inner shell 51 is fixedly connected to the outer shell 52 by spot welding or riveting. The inner shell 51 is fixedly connected to the outer shell 52 by spot welding or riveting, so that the connection between the inner shell 51 and the outer shell 52 is more stable.

[0043] As a further improvement of the present invention, see Figure 5 , baffles 521 bent inwards are provided on both sides of the front end of the outer shell 52, and the baffles 521 are located below the inner shell 51, and the baffles 521 are located in front of the raised portion 13. The upper surface of the inner shell 51 is provided with an inwardly bent spring sheet 513, and the lower surface of the inner shell 51 is provided with a protrusion 514 corresponding to the baffle 521. By arranging the baffle 521 below the inner shell 51 and arranging the protrusion 514 on the lower surface of the inner shell 51 corresponding to the baffle 521, the connector is effectively prevented from being stretched outwards and deformed when inserted into the device, and by arranging the inwardly bent spring sheet 513 on the upper surface of the inner shell 51, the tightness of the connection between the connector and the device is further strengthened to ensure the input and output effects.

[0044] As a further improvement of the present invention, abutment pieces 522 are extended on both sides of the rear end of the outer shell 52, and the second insulating portion 30 is provided with abutment grooves 33 corresponding to the abutment pieces 522, and the abutment pieces 522 extend into the abutment grooves 33. By extending the abutment pieces 522 on both sides of the rear end of the outer shell 52, and providing abutment grooves 33 on the second insulating portion 30 corresponding to the abutment pieces 522, and the abutment pieces 522 extend into the abutment grooves 33 for mating connection, the reliability of the connection between the outer shell 52 and the second insulating portion 30 is enhanced, and the stability of the pad-type TYPE-C connector is improved.

[0045] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0046] The above embodiments only express the preferred implementation of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent application. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A raised TYPE-C connector, characterized in that: include: A terminal group, the terminal group includes an upper row of terminals and a lower row of terminals, the terminal group includes a padding portion and a plug-in portion, at one end of the plug-in portion, the upper row of terminals and the lower row of terminals are arranged up and down, a clip is arranged between the upper row of terminals and the lower row of terminals, at one end of the padding portion, the upper row of terminals and the lower row of terminals are arranged in the same plane at intervals, and the padding portion is bent relative to the plug-in portion; A first insulating portion, the first insulating portion comprising a first plug-in portion insulating portion and a first raised portion insulating portion, the first plug-in portion insulating portion fixedly connecting the upper row of terminals, the lower row of terminals and the clip of the plug-in portion, and the first raised portion insulating portion fixedly connecting the upper row of terminals and the lower row of terminals of the raised portion; as well as The second insulating portion is fixedly connected to the relatively bent first plug-in portion insulating portion and the first raised portion insulating portion.

2. A raised TYPE-C connector according to claim 1, characterized in that: The insulating part of the first plug-in part is fixedly connected to the upper row of terminals, the lower row of terminals and the clip of the plug-in part by injection molding, the insulating part of the first raised part is fixedly connected to the upper row of terminals and the lower row of terminals of the raised part by injection molding, the second insulating part is fixedly connected to the first plug-in part insulating part and the first raised part insulating part by injection molding, clamping protrusions extending out of the upper row of terminals and the lower row of terminals are provided on both sides of the clip, and the first plug-in part insulating part and the second insulating part are connected by injection molding to form a clamping part.

3. The elevated TYPE-C connector according to claim 1, characterized in that: The upper row of terminals includes an upper contact portion, an upper fixing portion and an upper welding portion which are connected in sequence, the top surface of the upper contact portion exposes the front end upper surfaces of the first plug-in portion insulating portion and the second insulating portion, the upper fixing portion is fixed in the first insulating portion and the second insulating portion, and the upper welding portion vertically passes through the second insulating portion and horizontally extends out of the second insulating portion.

4. The elevated TYPE-C connector according to claim 1, characterized in that: The lower row of terminals includes a lower contact portion, a lower fixing portion and a lower welding portion connected in sequence, the bottom surface of the lower contact portion exposes the front end lower surfaces of the first plug-in portion insulating portion and the second insulating portion, the lower fixing portion is fixed in the first insulating portion and the second insulating portion, and the lower welding portion vertically passes through the second insulating portion and horizontally extends out of the second insulating portion.

5. The elevated TYPE-C connector according to claim 1, characterized in that: The elevated TYPE-C connector also includes a shielding shell, which includes an inner shell sleeved on the plug-in part and an outer shell sleeved on the inner shell and the elevated part. A buckle groove is provided on the end face of the second insulating part, and a buckle piece is provided on the inner shell corresponding to the buckle groove. The buckle piece is bent and extends into the buckle groove to be buckled and fixed.

6. The elevated TYPE-C connector according to claim 5, characterized in that: A groove is provided on the upper surface of the second insulating portion, and a protrusion is provided on the inner shell body corresponding to the groove, and the protrusion extends into the groove and is fixed.

7. The elevated TYPE-C connector according to claim 5, characterized in that: The inner shell and the outer shell are fixedly connected by spot welding or riveting.

8. The elevated TYPE-C connector according to claim 5, characterized in that: Baffles bent inwards are provided on both sides of the front end of the outer shell, the baffles are located below the inner shell, and the baffles are located in front of the raised portion.

9. The elevated TYPE-C connector according to claim 8, characterized in that: Abutment pieces are extended from both sides of the rear end of the outer shell, and the second insulating portion is provided with abutment grooves corresponding to the abutment pieces, and the abutment pieces extend into the abutment grooves.

10. The elevated TYPE-C connector according to claim 8, characterized in that: An inwardly bent elastic sheet is disposed on the upper surface of the inner shell, and a protrusion is disposed on the lower surface of the inner shell corresponding to the baffle.