Power device protective cover

Abstract

This application belongs to the technical field of power device protection devices, and provides a power device protective cover, which includes a first cover body, on which a plurality of positioning holes are formed for the pins of the power device to pass through; and a second cover body, which is detachably connected to the first cover body and is covered with the first cover body to form a plurality of accommodating grooves for accommodating the power device and at least one partition wall for isolating the accommodating grooves, and the positioning holes communicate with the accommodating grooves. The power device protective cover provided by this application adopts the cooperation of the first cover body and the second cover body. After the first cover body and the second cover body are covered, a plurality of mutually isolated accommodating grooves can be formed. A plurality of power devices are respectively accommodated in the plurality of accommodating grooves, and the adjacent two power devices are separated by the partition wall, ensuring that even between two power devices with a small distance under the wrapping of the first cover body and the second cover body, dangerous situations such as insulation failure will not occur, thus solving the problem of poor insulation between a plurality of densely distributed power devices.

Description

Technical Field

[0001] This application belongs to the technical field of power device protection devices, and more specifically, relates to a power device protective cover. Background Art

[0002] With the progress of welding technology, electric welders are gradually developing towards miniaturization, making the internal space of electric welders smaller and smaller. And due to the requirements of welding power, multiple power devices need to be connected to the printed circuit board (PCB) of the electric welder, which will inevitably lead to a reduction in the distance between two adjacent power devices, easily causing dangerous phenomena such as creepage between two adjacent power devices, and making the electric welder have a greater potential safety hazard. Summary of the Invention

[0003] The purpose of this application is to provide a power device protective cover, including but not limited to solving the technical problem of poor insulation between multiple densely distributed power devices.

[0004] To solve the above technical problem, an embodiment of this application provides a power device protective cover, including:

[0005] A first cover body, on which a plurality of positioning holes are provided for the pins of the power device to pass through; and

[0006] A second cover body, detachably connected to the first cover body, and covering the first cover body to form a plurality of accommodation grooves for accommodating the power device and at least one partition wall for isolating the accommodation grooves. One partition wall is provided between two adjacent accommodation grooves, and the positioning holes communicate with the accommodation grooves.

[0007] Optionally, a plurality of heat dissipation windows are provided on the second cover body for exposing the heat dissipation areas of the power device and contacting with the radiator, and the heat dissipation windows correspond to and communicate with the accommodation grooves one by one.

[0008] Optionally, a plurality of bosses for abutting against the printed circuit board are provided on the outer wall of the first cover body, the bosses correspond to the accommodation grooves one by one, and the positioning holes penetrate through the bosses.

[0009] Optionally, a plurality of first positioning groove groups for positioning the pins of the power device are provided on the inner wall of the first cover body, the first positioning groove groups correspond to the accommodation grooves one by one, the first positioning groove groups include a plurality of first positioning grooves distributed at intervals, and the first positioning grooves correspond to and communicate with the positioning holes one by one.

[0010] Optionally, a plurality of second positioning groove groups for positioning the pins of the power device are provided on the inner wall of the second cover body. The second positioning groove groups correspond to the first positioning groove groups one by one. The second positioning groove group includes a plurality of second positioning grooves distributed at intervals. The second positioning grooves and the first positioning grooves are combined to form a positioning cavity.

[0011] Optionally, the power device protective cover further includes a plurality of snap structures arranged oppositely. The snap structure includes:

[0012] An installation protrusion provided on one side edge of one of the first cover body and the second cover body; and

[0013] An installation lug provided on one side edge of the other of the first cover body and the second cover body. The installation lug is snap-connected to the installation protrusion.

[0014] Optionally, installation grooves are provided on the four peripheral edges of one of the first cover body and the second cover body, and installation flanges adapted to the installation grooves are provided on the four peripheral edges of the other of the first cover body and the second cover body.

[0015] Optionally, the power device protective cover further includes a plurality of positioning structures arranged oppositely. The positioning structure includes:

[0016] A positioning protrusion provided on one side edge of one of the first cover body and the second cover body adjacent to the snap structure; and

[0017] A third positioning groove provided on one side edge of the other of the first cover body and the second cover body adjacent to the snap structure. The positioning protrusion is inserted into the third positioning groove.

[0018] Optionally, a first installation hole is provided on the partition wall, an avoidance window for exposing the power device is provided on the first cover body, the power device protective cover further includes a pressing piece for passing through the avoidance window and pressing against the power device, and a second installation hole for passing a screw screwed to the first installation hole is provided on the pressing piece.

[0019] Optionally, the power device protective cover further includes:

[0020] A dust cover sleeved on the inner side of the pressing piece and covering the avoidance window.

[0021] The beneficial effects of the power device protective cover provided by this application are as follows: The first cover body and the second cover body are used in cooperation. After the first cover body and the second cover body are closed, a plurality of mutually isolated accommodation grooves can be formed. A plurality of power devices are respectively accommodated in the plurality of accommodation grooves, and adjacent two power devices are separated by isolation walls, ensuring that even between two power devices with a small distance under the wrapping of the first cover body and the second cover body, dangerous situations such as insulation failure will not occur. Thus, the technical problem of poor insulation between a plurality of densely distributed power devices is effectively solved, the electrical clearance between power devices is ensured, the safety and reliability of power devices during use are improved, and it can also play the role of a tooling fixture, enabling installers and maintenance personnel to keep the heights of the pins of power devices unified without the need to rely on other tools. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of this application, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the following described drawings are only some embodiments of this application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0023] Figure 1 is a three-dimensional schematic diagram of the power device protective cover provided by the embodiment of this application;

[0024] Figure 2 is a three-dimensional exploded schematic diagram of the power device protective cover provided by the embodiment of this application;

[0025] Figure 3 is a three-dimensional exploded schematic diagram of the power device protective cover from another angle provided by the embodiment of this application.

[0026] Among them, the reference numerals in the drawings are as follows:

[0027] 10 - power device protective cover, 11 - first cover body, 12 - second cover body, 15 - pressing piece, 16 - dust cover, 101 - accommodation groove, 102 - isolation wall, 111 - positioning hole, 112 - boss, 113 - first positioning groove group, 114 - installation groove, 115 - avoidance window, 121 - heat dissipation window, 122 - second positioning groove group, 123 - installation flange, 131 - installation protrusion, 132 - installation lug, 141 - positioning protrusion, 142 - third positioning groove, 150 - second installation hole, 160 - sleeve, 1020 - first installation hole, 1130 - first positioning groove, 1220 - second positioning groove;

[0028] 20 - power device, 21 - pin, 22 - heat dissipation area;

[0029] 30 - printed circuit board;

[0030] 40 - Screw. Detailed implementation manner

[0031] In order to make the technical problems, technical solutions and beneficial effects to be solved by this application clearer and more understandable, the following further details this application in combination with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not used to limit this application.

[0032] It should be noted that when a component is referred to as "fixed on" or "disposed on" another component, it can be directly on the other component or indirectly on the other component. When a component is referred to as "connected to" another component, it can be directly or indirectly connected to the other component. The orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, so it cannot be understood as a limitation of this patent. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances. Terms "first" and "second" are only used for the purpose of convenient description and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of technical features. The meaning of "a plurality" is two or more, unless otherwise specifically and clearly defined.

[0033] Please refer to Figures 1 to 3 , the power device protective cover 10 provided by this application includes a first cover body 11 and a second cover body 12. Among them, a plurality of positioning holes 111 are provided on the first cover body 11, and the positioning holes 111 are used for the pins 21 of the power device 20 to pass through. The second cover body 12 is detachably connected to the first cover body 11, and the second cover body 12 and the first cover body 11 are covered to form a plurality of accommodating grooves 101 and at least one partition wall 102. The accommodating grooves 101 are used for accommodating the power device 20, and the partition wall 102 is used for isolating the accommodating grooves 101, that is, a partition wall 102 is provided between two adjacent accommodating grooves 101, and the positioning holes 111 communicate with the accommodating grooves 101. It can be understood that both the first cover body 11 and the second cover body 12 are made of insulating materials; the number of the positioning holes 111 is adapted to the number of the pins 21 of the power device 20 installed in the power device protective cover 10. Taking the power device 20 used in an electric welding machine as an example, the power device 20 has three pins 21. If the power device protective cover 10 can accommodate two power devices 20, then one accommodating groove 101 corresponds to three positioning holes 111, and a total of two groups of six positioning holes 111 are provided on the first cover body 11; the ends of the pins 21 of the power device 20 can pass through the positioning holes 111 and extend out of the power device protective cover 10 for welding with the printed circuit board 30.

[0034] When it is necessary to install the power device 20 on the printed circuit board 30, first place the power device 20 at the position corresponding to the accommodation groove 101 on the inner wall of the first cover body 11, and extend the pin 21 of the power device 20 into the corresponding positioning hole 111. Then cover the second cover body 12 onto the first cover body 11, and multiple power devices 20 can be fixed inside the power device protective cover 10. Then, weld the end of the pin 21 extending outside the power device protective cover 10 to a specific position on the printed circuit board 30 to complete the installation of the power device 20.

[0035] For the power device protective cover 10 provided in this application, the first cover body 11 and the second cover body 12 are used in cooperation. After the first cover body 11 and the second cover body 12 are covered, multiple accommodation grooves 101 that are isolated from each other can be formed. Multiple power devices 20 are respectively accommodated in the multiple accommodation grooves 101, and the adjacent two power devices 20 are separated by the isolation wall 102, ensuring that even between two power devices 20 with a small distance under the wrapping of the first cover body 11 and the second cover body 12, dangerous situations such as insulation failure will not occur. Thus, the technical problem of poor insulation between multiple densely distributed power devices is effectively solved, the electrical clearance between the power devices 20 is ensured, the safety and reliability of the power devices 20 during use are improved, and it can also play the role of a tooling fixture, enabling the installation and maintenance personnel to keep the height of the pins 21 of the power devices 20 unified without the need to rely on other tools.

[0036] Optionally, please refer to Figure 2 and Figure 3 , as a specific embodiment of the power device protective cover provided in this application, a plurality of heat dissipation windows 121 are opened on the second cover body 12. The heat dissipation windows 121 correspond to the accommodation grooves 101 one by one and are communicated with each other, and are used for exposing the heat dissipation area 22 of the power device 20 and contacting the radiator. Specifically, the heat dissipation windows 121 penetrate through the inner and outer walls of the second cover body 12, are communicated with the accommodation grooves 101 one by one, and are directly opposite to the heat dissipation area 22 of the power device 20. When the power device 20 is accommodated in the accommodation groove 101, the heat dissipation area 22 of the power device 20 can be exposed outside the power device protective cover 10 through the heat dissipation window 121, which is beneficial for the heat dissipation area 22 of the power device 20 to fully contact the radiator to improve the heat dissipation efficiency.

[0037] Optionally, please refer to Figure 2 and Figure 3, as a specific embodiment of the power device protective cover provided by the present application, a plurality of bosses 112 are provided on the outer wall of the first cover body 11. The bosses 112 correspond to the accommodation grooves 101 one by one and are used to abut against the printed circuit board 30. The positioning holes 111 penetrate through the bosses 112. Specifically, the bosses 112 extend outward from the surface of the outer wall of the first cover body 11 along the axial direction of the positioning holes 111, and the extending height thereof matches the length of the pins 21 of the power device 20 extending outside the power device protective cover 10. That is, except for the length of the pins 21 used for soldering with the printed circuit board 30, the other parts of the pins 21 extending outside the power device protective cover 10 are wrapped by the bosses 112. In this way, it can prevent the pins 21 of the power device 20 from contacting the external environment and has good dust-proof and insulation effects.

[0038] Optionally, please refer to Figure 3 , as a specific embodiment of the power device protective cover provided by the present application, a plurality of first positioning groove groups 113 are formed on the inner wall of the first cover body 11. The first positioning groove groups 113 correspond to the accommodation grooves 101 one by one and are used to position the pins 21 of the power device 20. Here, the first positioning groove groups 113 include a plurality of first positioning grooves 1130 distributed at intervals. The first positioning grooves 1130 correspond to the positioning holes 111 one by one and are interconnected. Specifically, in the same first positioning groove group 113, the number of the first positioning grooves 1130 is adapted to the number of the pins 21 of the power device 20 accommodated in the accommodation groove 101. When the power device 20 is placed in the accommodation groove 101, the part of the pins 21 connected to the body of the power device 20 will be accommodated in the first positioning grooves 1130, and the part of the pins 21 away from the body of the power device 20 will pass through the positioning holes 111. In this way, through the cooperation of the first positioning grooves 1130 and the positioning holes 111, it can ensure that the pins 21 of the power device 20 extend to the expected installation positions, thereby effectively improving the installation accuracy and installation efficiency of the power device 20.

[0039] Optionally, please refer to Figure 2 and Figure 3, as a specific embodiment of the power device protective cover provided in this application, a plurality of second positioning groove groups 122 are provided on the inner wall of the second cover body 12. The second positioning groove groups 122 correspond to the first positioning groove groups 113 one by one and are used to position the pins 21 of the power device 20. Here, the second positioning groove group 122 includes a plurality of second positioning grooves 1220 distributed at intervals. The second positioning grooves 1220 and the first positioning grooves 1130 are combined to form a positioning cavity. Specifically, the positions of the second positioning groove groups 122 correspond to the positions of the first positioning groove groups 113, and the number and positions of the second positioning grooves 1220 correspond to the number and positions of the first positioning grooves 1130. When the second positioning grooves 1220 and the first positioning grooves 1130 are combined with each other, the positioning cavity formed by the two can wrap the part of the pin 21 connected to the body of the power device 20, separating two adjacent pins 21, ensuring the electrical clearance between the pins 21 of the power device 20, and improving the safety and reliability of the power device 20 during use.

[0040] Optionally, please refer to Figure 2 and Figure 3 , as a specific embodiment of the power device protective cover provided in this application, the power device protective cover 10 further includes a plurality of snap structures arranged oppositely. The snap structure includes an installation protrusion 131 and an installation lug 132. Among them, the installation protrusion 131 is provided on one side edge of one of the first cover body 11 and the second cover body 12, and the installation lug 132 is provided on one side edge of the other of the first cover body 11 and the second cover body 12. The installation lug 132 is snap-connected with the installation protrusion 131. Specifically, the number of snap structures provided is two or more. If the number of snap structures is an even number, the number of snap structures distributed on the opposite sides of the power device protective cover 10 is the same. If the number of snap structures is an odd number, the number of snap structures distributed on the opposite sides of the power device protective cover 10 is one more on one side than on the other side. If the installation protrusion 131 is provided on one side edge of the first cover body 11, then the installation lug 132 is provided on the corresponding one side edge of the second cover body 12. If the installation lug 132 is provided on one side edge of the first cover body 11, then the installation protrusion 131 is provided on the corresponding one side edge of the second cover body 12; the installation protrusion 131 is a wedge-shaped protrusion, and an installation hole adapted to the installation protrusion 131 is provided on the installation lug 132. When the second cover body 12 is covered on the first cover body 11, the installation protrusion 131 extends into the installation hole of the installation lug 132 to form a snap connection with the installation lug 132, thereby tightly connecting the second cover body 12 and the first cover body 11 together. The structure of the snap structure is simple, which is beneficial to improving the disassembly and assembly efficiency of the power device protective cover 10.

[0041] Optionally, please refer to Figure 2 and Figure 3, as a specific embodiment of the power device protective cover provided in this application, an installation groove 114 is provided on the four peripheral edges of one of the first cover body 11 and the second cover body 12. At the same time, an installation flange 123 is provided on the four peripheral edges of the other of the first cover body 11 and the second cover body 12, and the installation flange 123 is adapted to the installation groove 114. Specifically, if the installation groove 114 is provided on the four peripheral edges of the first cover body 11, then the installation flange 123 is provided on the four peripheral edges of the second cover body 12. If the installation flange 123 is provided on the four peripheral edges of the first cover body 11, then the installation groove 114 is provided on the four peripheral edges of the second cover body 12; the installation groove 114 extends circumferentially along the edge of the first cover body 11 or the second cover body 12. At the same time, the installation flange 123 extends circumferentially along the edge of the second cover body 12 or the first cover body 11. When the second cover body 12 is closed onto the first cover body 11, the installation flange 123 extends into the installation groove 114 to wrap the inner wall of the first cover body 11 or the inner wall of the second cover body 12, so as to form mutual limitation between the first cover body 11 and the second cover body 12, making the closing of the first cover body 11 and the second cover body 12 more firm and reliable, and further improving the dust-proof effect of the power device protective cover 10.

[0042] Optionally, please refer to Figure 2 and Figure 3, as a specific embodiment of the power device protective cover provided in this application, the power device protective cover 10 further includes a plurality of positioning structures arranged oppositely. The positioning structure includes a positioning protrusion 141 and a third positioning groove 142. Among them, the positioning protrusion 141 is arranged on one of the first cover body 11 and the second cover body 12 on the side edge adjacent to the above-mentioned buckle structure, and the third positioning groove 142 is arranged on the other of the first cover body 11 and the second cover body 12 on the side edge adjacent to the above-mentioned buckle structure. The positioning protrusion 141 is inserted into the third positioning groove 142. Specifically, the position of the positioning structure is adjacent to the position of the buckle structure, and the number of the positioning structures is two or more. If the number of the positioning structures is an even number, the number of the positioning structures distributed on the opposite sides of the power device protective cover 10 is the same. If the number of the positioning structures is an odd number, the number of the positioning structures distributed on the opposite sides of the power device protective cover 10 is one more on one side than on the other side. If the positioning protrusion 141 is arranged on one side edge of the first cover body 11, then the third positioning groove 142 is opened on the corresponding side edge of the second cover body 12. If the third positioning groove 142 is opened on one side edge of the first cover body 11, then the positioning protrusion 141 is arranged on the corresponding side edge of the second cover body 12; the positioning protrusion 141 can be in the shape of a rectangular sheet or a cylinder, and the third positioning groove 142 can be a rectangular groove or a cylindrical groove. During the process of the second cover body 12 covering the first cover body 11, the positioning protrusion 141 first extends into the third positioning groove 142. As the positioning protrusion 141 gradually penetrates into the third positioning groove 142, then the installation lug 132 is engaged with the installation protrusion 131 to complete the covering of the first cover body 11 and the second cover body 12, thereby effectively improving the installation accuracy and stability of the first cover body 11 and the second cover body 12, and enhancing the assembly efficiency of the power device protective cover 10.

[0043] Optionally, please refer to Figure 2 and Figure 3, as a specific embodiment of the power device protective cover provided by the present application, a first mounting hole 1020 is formed in the partition wall 102, and an avoidance window 115 is formed in the first cover body 11. The avoidance window 115 is used for the power device 20 to be exposed. At the same time, the power device protective cover 10 further includes a pressing piece 15. The pressing piece 15 is used to pass through the avoidance window 115 and press against the power device 20. And a second mounting hole 150 is formed in the pressing piece 15. The second mounting hole 150 is used for a screw 40 screwed to the first mounting hole 1020 to pass through. Specifically, the first mounting hole 1020 penetrates through the partition wall 102. The avoidance window 115 communicates with a plurality of accommodating grooves 111. Through the avoidance window 115, a plurality of power devices 20 accommodated in the plurality of accommodating grooves 111 can be exposed. The pressing piece 15 is of a bent structure. The pressing piece 15 can be embedded in the avoidance window 115. And the part of the pressing piece 15 corresponding to the accommodating groove 111 arches towards the side close to the avoidance window 115. The part of the pressing piece 15 corresponding to the partition wall 102 arches towards the side away from the avoidance window 115. The second mounting hole 150 penetrates through the part of the pressing piece 15 corresponding to the partition wall 102. In this way, under the action of the external force applied by the screw 40, the pressing piece 15 can simultaneously push against a plurality of power devices 20. Here, the second mounting hole 150 corresponds to the first mounting hole 1020 one by one. After the power device 20 is connected to the printed circuit board 30, in order to make the heat dissipation area 22 of the power device 20 fully contact with the radiator, the screw 40 passing through the second mounting hole 150 can be screwed into the first mounting hole 1020 to push the pressing piece 15. By pushing the power device 20 with the pressing piece 15, the heat dissipation area 22 of the power device 20 is closely attached to the radiator.

[0044] Optionally, please refer to Figure 2 and Figure 3 , as a specific embodiment of the power device protective cover provided by the present application, the power device protective cover 10 further includes a dust-proof sleeve 16. The dust-proof sleeve 16 is sleeved on the inner side of the pressing piece 15 and covers the avoidance window 115. Specifically, the dust-proof sleeve 16 can be made of silica gel material. And the contour shape of the dust-proof sleeve 16 is adapted to the contour shape of the avoidance window 115. A sleeve 160 for the screw to pass through is provided at the position of the dust-proof sleeve 16 corresponding to the first mounting hole 1020. The sleeve 160 can be accommodated in the first mounting hole 1020. In this way, the dust-proof sleeve 16 can complete the closure of the avoidance window 115 under the extrusion of the pressing piece 15, further improving the dust-proof effect of the power device protective cover 10.

[0045] The above are only optional embodiments of the present application and are not used to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the scope of the claims of the present application.

Claims

1. Power device protective cover, Characterized in that: Comprising: A first cover body, on which a plurality of positioning holes are provided for the pins of the power device to pass through; And A second cover body, detachably connected to the first cover body, and covering the first cover body to form a plurality of accommodating grooves for accommodating the power device and at least one partition wall for isolating the accommodating grooves. One partition wall is provided between two adjacent accommodating grooves, and the positioning holes are communicated with the accommodating grooves; A plurality of snap structures arranged oppositely; A plurality of positioning structures arranged oppositely; On the outer wall of the first cover body, there are a plurality of bosses for abutting against the printed circuit board. The bosses correspond to the accommodating grooves one by one. The positioning holes penetrate through the bosses. On the inner wall of the first cover body, there are a plurality of first positioning groove groups for positioning the pins of the power device. The first positioning groove groups correspond to the accommodating grooves one by one. The first positioning groove group includes a plurality of first positioning grooves distributed at intervals. The first positioning grooves correspond to and communicate with the positioning holes one by one. On the inner wall of the second cover body, there are a plurality of second positioning groove groups for positioning the pins of the power device. The second positioning groove groups correspond to the first positioning groove groups one by one. The second positioning groove group includes a plurality of second positioning grooves distributed at intervals. The second positioning grooves are combined with the first positioning grooves to form a positioning cavity; The snap structure includes: An installation protrusion, provided on one side edge of one of the first cover body and the second cover body. The installation protrusion is a wedge-shaped protrusion; and An installation lug, provided on one side edge of the other of the first cover body and the second cover body. The installation lug is provided with an installation hole adapted to the installation protrusion. When the second cover body is covered on the first cover body, the installation protrusion extends into the installation hole to form a snap connection with the installation lug; The positioning structure includes: A positioning protrusion, provided on one side edge of one of the first cover body and the second cover body adjacent to the snap structure; and A third positioning groove, provided on one side edge of the other of the first cover body and the second cover body adjacent to the snap structure. The positioning protrusion is inserted into the third positioning groove.

2. The power device protective cover according to claim 1, Characterized in that: On the second cover body, there are a plurality of heat dissipation windows for exposing the heat dissipation area of the power device and contacting with the radiator. The heat dissipation windows correspond to and communicate with the accommodating grooves one by one.

3. The power device protective cover according to claim 1 or 2, Characterized in that: On the four peripheral edges of one of the first cover body and the second cover body, an installation groove is provided. On the four peripheral edges of the other of the first cover body and the second cover body, an installation flange adapted to the installation groove is provided.

4. The power device protective cover according to claim 1 or 2, Characterized in that: The isolation wall is provided with a first mounting hole, the first cover body is provided with an avoidance window for exposing the power device, the power device protection cover further includes a pressing piece for passing through the avoidance window and pressing against the power device, and the pressing piece is provided with a second mounting hole for a screw screwed to the first mounting hole to pass through.

5. The power device protection cover according to claim 4, characterized in that: further comprising: a dust-proof sleeve sleeved on the inner side of the pressing piece and covering the avoidance window.

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