Stretch-resistant flexible capacitor

Abstract

The utility model relates to the technical field of electronic components discloses a kind of tensile flexible capacitor, including flexible substrate one, the right side of flexible substrate one is provided with connecting mechanism, the connecting mechanism is used to promote the tensile capacity when flexible capacitor is bent, the right side of connecting mechanism is provided with flexible substrate two, the inside of flexible substrate one and flexible substrate two is provided with electrolytic mechanism, the electrolytic mechanism is used as the electrolyte purpose of capacitor, the top of two the electrolytic mechanism is provided with positive electrode mechanism, the bottom of two the electrolytic mechanism is provided with negative electrode mechanism, the adjacent between two the positive electrode mechanism and two negative electrode mechanism is provided with wire mechanism. In the utility model, in the bending process of capacitor, elastic net first promotes tensile capacity by self elastic deformation, to tensile limit, limit strip prevents stretching, can effectively cope with the stretching generated by bending, protect bending place not to be damaged.

Description

Technical Field

[0001] This utility model relates to the field of electronic component technology, and in particular to a tensile-resistant flexible capacitor. Background Technology

[0002] A capacitor is an electronic component that stores electrical charge. It consists of two insulated conductors placed close to each other with an insulating dielectric in between. When a voltage is applied between the two plates, the charge accumulates on the plates, thus storing electrical energy. When the voltage is removed, the charge is slowly released. Capacitors have the characteristic of passing AC and blocking DC, and are used in circuit filtering, coupling, energy storage, and tuning applications.

[0003] A search revealed a Chinese patent publication number: CN216749606U, which discloses a flexible capacitor. The capacitor includes an electrode substrate with an electrode groove on its upper surface. Electrodes are disposed within the electrode groove, including a positive electrode and a negative electrode. Each positive and negative electrode includes a lead sheet, on which a set of electrode plates are evenly distributed. A capacitor dielectric is disposed between the electrode plates of the positive and negative electrodes. A substrate cover is adhered to the top of the electrode substrate via an adhesive layer. While this invention has a simple structure, is easy to process, and has high stability, in practical use, the capacitor cannot effectively withstand the stretching caused by bending, leading to damage at the bending point and affecting its use. Utility Model Content

[0004] To overcome the above shortcomings, this utility model provides a tensile-resistant flexible capacitor, which aims to improve the problem that the capacitor cannot effectively cope with the tensile stress caused by bending when it is used, resulting in damage at the bending point and affecting its use.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a tensile-resistant flexible capacitor, comprising a flexible substrate one, a connecting mechanism provided on the right side of the flexible substrate one, the connecting mechanism being used to improve the tensile resistance of the flexible capacitor when bent, a flexible substrate two provided on the right side of the connecting mechanism, an electrolysis mechanism provided on the inner side of both the flexible substrate one and the flexible substrate two, the electrolysis mechanism being used as the electrolyte of the capacitor, a positive electrode mechanism provided at the top of both electrolysis mechanisms, a negative electrode mechanism provided at the bottom of both electrolysis mechanisms, and a wire mechanism provided between the adjacent positive electrode mechanism and the two negative electrode mechanism; The connecting mechanism includes multiple connecting seats, which are fixedly connected to each other at the top and bottom of flexible substrate one and flexible substrate two, respectively. Each of the multiple connecting seats is fixedly connected to a limiting strip on the opposite side. Each of the flexible substrate one and flexible substrate two is fixedly connected to each other, and an elastic net is fixedly connected to each of the two connecting strips.

[0006] Through the above technical solution: the connecting seat is used to fix the flexible base and the limiting strip, the connecting strip is used to fix the flexible base and the elastic mesh, the limiting strip plays a role in limiting the continued stretching after the elastic mesh exceeds the stretching range, and the elastic mesh enhances the tensile resistance during the bending process of the capacitor.

[0007] As a further description of the above technical solution: Both electrolysis mechanisms include an electrolyte layer. The outer walls of the two electrolyte layers are respectively disposed on the inner sides of flexible substrate one and flexible substrate two. The outer walls of the two electrolyte layers are fixedly connected with insulating edging. The outer walls of the two insulating edgings are fixedly connected with fixing strips. The inner sides of flexible substrate one and flexible substrate two are provided with grooves.

[0008] The above technical solution involves an electrolyte layer serving as the electrolyte in a capacitor, an insulating edging covering the electrolyte layer, and a fixing strip securing the electrolyte layer and the insulating edging within a groove on the inner side of a flexible substrate.

[0009] As a further description of the above technical solution: Both positive electrode mechanisms include positive electrode plates, the bottoms of the two positive electrode plates are respectively fixedly connected to the tops of the two electrolyte layers, the tops of the two positive electrode plates are fixedly connected to positive insulating layers, and positive interface components are provided on the rear sides of the two positive electrode plates.

[0010] The above technical solution involves attaching the positive electrode plate to the top of the electrolyte layer and using a positive insulating layer to prevent the positive electrode plate from contacting external objects.

[0011] As a further description of the above technical solution: Both of the positive interface components include a positive conductor, the front sides of the two positive conductors are respectively fixedly connected to the rear sides of the two positive plates, and a positive pad is fixedly connected to the rear side of each of the two positive conductors.

[0012] The above technical solution connects the positive electrode plate to the positive electrode pad, and the positive electrode pad is connected to the external circuit.

[0013] As a further description of the above technical solution: Both negative electrode mechanisms include negative electrode plates, the tops of the two negative electrode plates are fixedly connected to the bottoms of the two electrolyte layers, the bottoms of the two negative electrode plates are fixedly connected to negative insulating layers, and the front sides of the two negative electrode plates are provided with negative interface components.

[0014] The above technical solution involves the negative electrode plate being attached to the bottom of the electrolyte layer, and the negative insulating layer preventing the negative electrode plate from contacting external objects.

[0015] As a further description of the above technical solution: Both negative interface components include a negative conductor, the rear sides of the two negative conductors are respectively fixedly connected to the front sides of the two negative plates, and negative pads are fixedly connected to the front sides of the two negative conductors.

[0016] The above technical solution connects the negative electrode plate to the negative electrode pad, and the negative electrode pad is connected to the external circuit.

[0017] As a further description of the above technical solution: The conductor mechanism includes multiple pins, which are respectively positioned between adjacent positive electrode mechanisms and between adjacent negative electrode mechanisms. Enamelled wires are fixedly connected between adjacent pins, and two fixing components are provided on the outer walls of the two enamelled wires.

[0018] The above technical solution involves pins leading out the positive and negative plates, and enameled wires connecting the positive and negative plates of adjacent capacitors.

[0019] As a further description of the above technical solution: Each of the aforementioned fixing components includes a fixing seat, and each of the aforementioned fixing seats has a through hole on its inner side.

[0020] The above technical solution secures the enameled wire to prevent it from coming off the pin when pulled, and the through hole allows the enameled wire to pass through in order to secure the mounting base.

[0021] This utility model has the following beneficial effects: 1. In this utility model, the elastic mesh enhances the tensile strength when the capacitor is bent, and the limiting strip restricts further stretching after the elastic mesh exceeds the stretching range. During the bending process of the capacitor, the elastic mesh first enhances the tensile strength through its own elastic deformation. When the stretching limit is reached, the limiting strip prevents further stretching, thereby effectively improving the tensile strength of the flexible capacitor when it is bent. When used in bending, it can effectively cope with the stretching caused by bending and protect the bent part of the capacitor from damage.

[0022] 2. In this utility model, the electrolyte layer is sandwiched between the positive and negative electrode mechanisms, serving as the electrolyte of the capacitor. The insulating edging wraps around the electrolyte layer to prevent leakage from contact with the outside. The fixing strip fixes the electrolyte layer and the insulating edging in the groove inside the flexible substrate, ensuring the stable setting of the electrolyte layer and preventing it from easily shifting due to external forces. This ensures the stable position of the electrolyte layer in the capacitor, improves the safety and reliability of the capacitor, and provides a guarantee for the normal operation of the capacitor. Attached Figure Description

[0023] Figure 1 This is a perspective view of a tensile-resistant flexible capacitor proposed in this utility model; Figure 2This is a schematic diagram of the connection mechanism in a tensile-resistant flexible capacitor proposed in this utility model; Figure 3 This is a split view of the flexible substrate in the tensile-resistant flexible capacitor proposed in this utility model; Figure 4 This is a split view of the electrolysis mechanism in a tensile-resistant flexible capacitor proposed in this utility model; Figure 5 This is an exploded view of the wire mechanism in a tensile-resistant flexible capacitor proposed in this utility model.

[0024] Legend: 1. Flexible substrate one; 2. Flexible substrate two; 3. Connecting mechanism; 301. Connecting seat; 302. Restricting strip; 303. Elastic mesh; 304. Connecting strip; 4. Electrolysis mechanism; 401. Electrolyte layer; 402. Groove; 403. Fixing strip; 404. Insulating edge; 5. Positive electrode mechanism; 501. Positive electrode plate; 502. Positive insulating layer; 503. Positive interface assembly; 5031. Positive conductor; 5032. Positive pad; 6. Negative electrode mechanism; 601. Negative electrode plate; 602. Negative insulating layer; 603. Negative interface assembly; 6031. Negative conductor; 6032. Negative pad; 7. Wire mechanism; 701. Pin; 702. Enamelled wire; 703. Fixing assembly; 7031. Fixing seat; 7032. Via. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] Reference Figure 1 and Figure 2 The present invention provides an embodiment of a tensile-resistant flexible capacitor, comprising a flexible substrate 1, a connecting mechanism 3 on the right side of the flexible substrate 1, the connecting mechanism 3 being used to improve the tensile strength of the flexible capacitor when bent, a flexible substrate 2 on the right side of the connecting mechanism 3, an electrolysis mechanism 4 on the inner side of both the flexible substrate 1 and the flexible substrate 2, the electrolysis mechanism 4 being used as the electrolyte of the capacitor, a positive electrode mechanism 5 on the top of both electrolysis mechanisms 4, a negative electrode mechanism 6 on the bottom of both electrolysis mechanisms 4, and a wire mechanism 7 between adjacent positive electrode mechanisms 5 and negative electrode mechanisms 6. The connecting mechanism 3 includes multiple connecting seats 301. The multiple connecting seats 301 are fixedly connected to each other at the top and bottom of the flexible substrate 1 and the flexible substrate 2, respectively. A limiting strip 302 is fixedly connected to each side of the multiple connecting seats 301 that are far apart from each other. A connecting strip 304 is fixedly connected between each adjacent side of the flexible substrate 1 and the flexible substrate 2. An elastic net 303 is fixedly connected between each adjacent side of two connecting strips 304. Specifically, flexible substrate 1 and flexible substrate 2 can be bent within a certain range. A connecting mechanism 3 is provided on the right side of flexible substrate 1, which enhances the tensile strength of the flexible capacitor during bending. Flexible substrate 2 is located on the right side of the connecting mechanism 3. Electrolysis mechanisms 4 are provided on the inner sides of both flexible substrates 1 and 2, serving as the electrolyte for the capacitor. A positive electrode mechanism 5 is provided at the top of each of the two electrolysis mechanisms 4, acting as the positive electrode of the capacitor. A negative electrode mechanism 6 is provided at the bottom of each of the two electrolysis mechanisms 4, acting as the negative electrode of the capacitor. A wire mechanism 7 is provided between adjacent positive electrode mechanisms 5 and negative electrode mechanisms 6, used for connecting multiple capacitors. The connecting mechanism 3 includes multiple connecting seats 301. Connecting seat 301 fixes flexible substrate 1 and flexible substrate 2 to limiting strip 302. Multiple connecting seats 301 are fixedly connected to each other at the top and bottom of flexible substrate 1 and flexible substrate 2, respectively. Limiting strip 302 is fixedly connected to each side of multiple connecting seats 301 that are far apart. Limiting strip 302 restricts further stretching after elastic net 303 exceeds the stretching range. The length of limiting strip 302 is less than the length of enameled wire 702. Connecting strip 304 is fixedly connected to each other between flexible substrate 1 and flexible substrate 2. Connecting strip 304 fixes flexible substrate 1 and flexible substrate 2 to elastic net 303. Elastic net 303 is fixedly connected to each other between two connecting strips 304. Elastic net 303 can enhance the tensile strength of capacitor during bending.

[0027] Reference Figure 3 and Figure 4 Both electrolysis mechanisms 4 include an electrolyte layer 401. The outer walls of the two electrolyte layers 401 are respectively disposed on the inner side of the flexible substrate 1 and the flexible substrate 2. The outer walls of the two electrolyte layers 401 are fixedly connected with insulating edging 404. The outer walls of the two insulating edging 404 are fixedly connected with fixing strips 403. The inner sides of the flexible substrate 1 and the flexible substrate 2 are provided with grooves 402. Specifically, the electrolyte layer 401 is sandwiched between the positive electrode mechanism 5 and the negative electrode mechanism 6. The outer walls of the two electrolyte layers 401 are respectively disposed on the inner sides of the flexible substrate 1 and the flexible substrate 2. The outer walls of the two electrolyte layers 401 are fixedly connected with insulating edges 404, which cover the electrolyte layers 401. The outer walls of the two insulating edges 404 are fixedly connected with fixing strips 403, which fix the electrolyte layers 401 and the insulating edges 404 to the inner sides of the flexible substrate 1 and the flexible substrate 2, and engage them in the grooves 402. The inner sides of the flexible substrate 1 and the flexible substrate 2 are both provided with grooves 402.

[0028] Reference Figure 1 and Figure 3 Both positive electrode mechanisms 5 include positive electrode plates 501. The bottom of the two positive electrode plates 501 is fixedly connected to the top of the two electrolyte layers 401 respectively. A positive insulating layer 502 is fixedly connected to the top of the two positive electrode plates 501. A positive interface assembly 503 is provided on the rear side of the two positive electrode plates 501. Both positive interface assemblies 503 include positive electrode conductors 5031. The front side of the two positive electrode conductors 5031 is fixedly connected to the rear side of the two positive electrode plates 501 respectively. A positive electrode pad 5032 is fixedly connected to the rear side of the two positive electrode conductors 5031. Specifically, the positive electrode plate 501 is attached to the top of the electrolyte layer 401, and the bottom of the two positive electrode plates 501 are respectively fixedly connected to the top of the two electrolyte layers 401. The top of each of the two positive electrode plates 501 is fixedly connected to a positive insulating layer 502, which prevents the positive electrode plate 501 from touching external objects. A positive interface assembly 503 is provided on the rear side of each of the two positive electrode plates 501. Each of the two positive interface assemblies 503 includes a positive conductor 5031, which conducts the positive electrode plate 501 to the positive electrode pad 5032. The front side of each of the two positive conductors 5031 is fixedly connected to the rear side of the two positive electrode plates 501. A positive electrode pad 5032 is fixedly connected to the rear side of each of the two positive conductors 5031, and the positive electrode pad 5032 is connected to the external circuit.

[0029] Reference Figure 1 , Figure 3 and Figure 5Both negative electrode mechanisms 6 include negative electrode plates 601. The tops of the two negative electrode plates 601 are fixedly connected to the bottoms of the two electrolyte layers 401, and negative insulating layers 602 are fixedly connected to the bottoms of the two negative electrode plates 601. Negative interface assemblies 603 are provided on the front sides of the two negative electrode plates 601, and each negative interface assembly 603 includes a negative electrode conductor 6031. The rear sides of the two negative electrode conductors 6031 are fixedly connected to the front sides of the two negative electrode plates 601. The front side is fixedly connected to a negative electrode pad 6032. The wire mechanism 7 includes multiple pins 701. The multiple pins 701 are respectively arranged between the adjacent two positive electrode mechanisms 5 and the adjacent two negative electrode mechanisms 6. Enamelled wires 702 are fixedly connected between the adjacent multiple pins 701. Two fixing components 703 are provided on the outer wall of each of the two enamelled wires 702. The multiple fixing components 703 include fixing seats 7031. Through holes 7032 are opened on the inner side of the multiple fixing seats 7031. Specifically, the negative electrode plate 601 is attached to the bottom of the electrolyte layer 401. The tops of the two negative electrode plates 601 are respectively fixedly connected to the bottoms of the two electrolyte layers 401. A negative insulating layer 602 is fixedly connected to the bottom of each of the two negative electrode plates 601 to prevent the negative electrode plates 601 from contacting external objects. A negative interface assembly 603 is provided on the front side of each of the two negative electrode plates 601. Each negative interface assembly 603 includes a negative conductor 6031, which connects the negative electrode plate 601 to the negative electrode pad 6032. The rear sides of the two negative conductors 6031 are respectively fixedly connected to the front sides of the two negative electrode plates 601. A negative electrode pad 6032 is fixedly connected to the front side of each of the two negative conductors 6031, and the negative electrode pad 6032 is connected to the external circuit. The wire mechanism includes 7 packages. The capacitor includes multiple pins 701, from which positive electrode plate 501 and negative electrode plate 601 are led out. The multiple pins 701 are respectively positioned between adjacent positive electrode mechanisms 5 and two negative electrode mechanisms 6. Enamelled wires 702 are fixedly connected between adjacent pins 701. The enamelled wires 702 connect the positive electrode plate 501 and the negative electrode plate 601 of adjacent capacitors. Two fixing components 703 are provided on the outer wall of each of the two enamelled wires 702. Each fixing component 703 includes a fixing seat 7031. The fixing seat 7031 fixes the enamelled wire 702 to prevent the enamelled wire 702 from falling off the pin 701 when pulled. Through holes 7032 are opened on the inner side of each fixing seat 7031. The enamelled wire 702 passes through the through holes 7032 to fix the fixing seat 7031.

[0030] Working principle: Adjacent capacitors are connected via multiple pins 701 of the wire mechanism 7. Pins 701 are positioned between adjacent positive terminals 5 and two negative terminals 6. Adjacent pins 701 are fixedly connected by enameled wire 702. A fixing component 703 is provided on the outer wall of the enameled wire 702. A through hole 7032 is provided inside the fixing seat 7031 of the fixing component 703. The enameled wire 702 passes through the through hole 7032 for fixation, preventing it from falling off the pin 701 during pulling. This completes the extended connection of multiple capacitors. When a capacitor needs to be connected to the circuit, the positive interface component 503 of the positive terminal 5 and the negative interface component 6... The negative interface component 603 of the electrode mechanism 6 functions, with the front side of the positive conductor 5031 of the positive interface component 503 fixed to the rear side of the positive plate 501, and the rear positive pad 5032 connected to the external circuit. The rear side of the negative conductor 6031 of the negative interface component 603 is fixed to the front side of the negative plate 601, and the front negative pad 6032 connected to the external circuit, thus enabling the capacitor to conduct through the circuit. During capacitor operation, the electrolyte layer 401 of the electrolysis mechanism 4 is sandwiched between the positive plate 501 of the positive electrode mechanism 5 and the negative plate 601 of the negative electrode mechanism 6, functioning as an electrolyte. The outer wall of the electrolyte layer 401 is fixed with an insulating edging 404. A fixing strip 403 is fixed to the outer wall of the insulating edging 404. The fixing strip 403 fixes the electrolyte layer 401 and the insulating edging 404 in the grooves 402 opened inside the flexible substrate 1 and the flexible substrate 2, ensuring the stable setting of the electrolyte layer 401. When the capacitor needs to be bent, the connecting mechanism 3 starts to work. Multiple connecting seats 301 of the connecting mechanism 3 are fixed to each other at the top and bottom of the flexible substrate 1 and the flexible substrate 2, respectively. A limiting strip 302 is fixed to the side of the connecting seat 301 that is far away from the phase. The length of the limiting strip 302 is less than the length of the enameled wire 702. The phases of the flexible substrate 1 and the flexible substrate 2 are... Connecting strips 304 are fixed between adjacent plates, and elastic mesh 303 is fixed between adjacent connecting strips 304. During bending, elastic mesh 303 can enhance the tensile strength of the capacitor. When elastic mesh 303 exceeds the stretching range, limiting strip 302 will limit further stretching and protect the capacitor structure. Throughout the process, a positive insulating layer 502 is fixed to the top of the positive plate 501 and a negative insulating layer 602 is fixed to the bottom of the negative plate 601, respectively preventing the positive plate 501 and the negative plate 601 from contacting external objects, ensuring the safe and stable operation of the capacitor, realizing the function of the capacitor, and at the same time having good tensile strength, which can adapt to different application scenarios.

[0031] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A tensile-resistant flexible capacitor, comprising a flexible substrate (1), characterized in that: A connecting mechanism (3) is provided on the right side of the first flexible substrate (1). The connecting mechanism (3) is used to improve the tensile strength of the flexible capacitor when it is bent. A second flexible substrate (2) is provided on the right side of the connecting mechanism (3). An electrolysis mechanism (4) is provided on the inner side of both the first flexible substrate (1) and the second flexible substrate (2). The electrolysis mechanism (4) is used as the electrolyte of the capacitor. A positive electrode mechanism (5) is provided on the top of both electrolysis mechanisms (4). A negative electrode mechanism (6) is provided on the bottom of both electrolysis mechanisms (4). A wire mechanism (7) is provided between the two positive electrode mechanisms (5) and the two negative electrode mechanisms (6). The connecting mechanism (3) includes multiple connecting seats (301). The multiple connecting seats (301) are fixedly connected to each other at the top and bottom of the flexible substrate one (1) and the flexible substrate two (2). A limiting strip (302) is fixedly connected to each of the multiple connecting seats (301) on the opposite side. A connecting strip (304) is fixedly connected to each of the flexible substrate one (1) and the flexible substrate two (2). An elastic net (303) is fixedly connected to each of the two connecting strips (304).

2. The tensile-resistant flexible capacitor according to claim 1, characterized in that: Both of the electrolysis mechanisms (4) include an electrolyte layer (401). The outer walls of the two electrolyte layers (401) are respectively disposed on the inner side of the first flexible substrate (1) and the second flexible substrate (2). The outer walls of the two electrolyte layers (401) are fixedly connected with insulating edging (404). The outer walls of the two insulating edging (404) are fixedly connected with fixing strips (403). The inner sides of the first flexible substrate (1) and the second flexible substrate (2) are provided with grooves (402).

3. The tensile-resistant flexible capacitor according to claim 2, characterized in that: Both positive electrode mechanisms (5) include a positive electrode plate (501). The bottom of the two positive electrode plates (501) is fixedly connected to the top of the two electrolyte layers (401). A positive insulating layer (502) is fixedly connected to the top of the two positive electrode plates (501). A positive interface assembly (503) is provided on the rear side of the two positive electrode plates (501).

4. A tensile-resistant flexible capacitor according to claim 3, characterized in that: Both positive interface components (503) include a positive conductor (5031), the front sides of the two positive conductors (5031) are fixedly connected to the rear sides of the two positive plates (501), and a positive pad (5032) is fixedly connected to the rear side of each of the two positive conductors (5031).

5. A tensile-resistant flexible capacitor according to claim 2, characterized in that: Both negative electrode mechanisms (6) include a negative electrode plate (601), the top of the two negative electrode plates (601) are fixedly connected to the bottom of the two electrolyte layers (401), the bottom of the two negative electrode plates (601) are fixedly connected to a negative insulating layer (602), and a negative interface assembly (603) is provided on the front side of the two negative electrode plates (601).

6. A tensile-resistant flexible capacitor according to claim 5, characterized in that: Both negative interface components (603) include a negative conductor (6031), the rear side of the two negative conductors (6031) is fixedly connected to the front side of the two negative plates (601), and a negative pad (6032) is fixedly connected to the front side of the two negative conductors (6031).

7. A tensile-resistant flexible capacitor according to claim 1, characterized in that: The conductor mechanism (7) includes multiple pins (701), and the multiple pins (701) are respectively arranged between the adjacent two positive electrode mechanisms (5) and the adjacent two negative electrode mechanisms (6). Enamelled wires (702) are fixedly connected between the adjacent multiple pins (701), and two fixing components (703) are provided on the outer walls of the two enamelled wires (702).

8. A tensile-resistant flexible capacitor according to claim 7, characterized in that: Each of the multiple fixing components (703) includes a fixing seat (7031), and each of the multiple fixing seats (7031) has a through hole (7032) on its inner side.

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