Socket core assembly and socket
By introducing waterproof parts and sealing structures into the socket core assembly, the problem of short circuit of the socket in a humid environment is solved, achieving higher safety and reliability.
Patent Information
- Application Number
- CN202422943374.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-29
- Publication Date
- 2025-10-17
- Estimated Expiration
- 2034-11-29
AI Technical Summary
When the existing socket is exposed to rain or splashing water, water can easily enter the socket, causing electrical connection between sockets of different poles through water, resulting in a short circuit risk.
A socket core assembly is designed, including a bracket, a socket assembly, an upper cover, a protective door and a waterproof part. The elasticity and sealing structure of the sealing part are used to prevent water from entering the pin hole and blocking the electrical connection. The drainage hole and pipe are combined to drain moisture and improve the waterproof effect.
It effectively prevents the socket from short-circuiting in a humid environment, improves the safety and reliability of the socket, and ensures that the electrical connection between the pin and the socket assembly is not achieved through water.
Smart Images
Figure CN223451290U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present disclosure relates to the technical field of electrical appliances, in particular to a socket core assembly and a socket. BACKGROUND
[0002] The socket is a commonly used household appliance, which is used to take electricity from an external power supply, thereby providing power for other electrical appliances. The socket includes an upper shell, a lower shell and a socket core assembly, and the socket core assembly is located inside the upper shell and the lower shell.
[0003] In the related art, the socket core assembly includes a support and a socket assembly. When the plug of the other electrical appliance is inserted into the socket assembly, electricity can be taken through the socket.
[0004] However, when the socket in the related art is rained or splashed with water, water easily enters the inside of the socket. The sockets of different poles in the socket assembly are electrically connected through water, thereby causing the socket to short circuit, thereby causing an electrical hazard. INVENTION CONTENTS
[0005] The present disclosure provides a socket core assembly and a socket, which can solve the technical problems existing in the related art. The technical solutions of the socket core assembly and the socket are as follows.
[0006] In a first aspect, the present disclosure provides a socket core assembly, which includes a support, a socket assembly, an upper cover, a protection door and a waterproof member.
[0007] The support includes a support plate and a plurality of partition ribs, one side of the support plate is fixedly connected with the plurality of partition ribs, and the socket assembly is limited between the plurality of partition ribs.
[0008] The support plate includes a plurality of pin holes, and a protection cabin is formed between the side of the support plate facing away from the partition ribs and the upper cover. The plurality of pin holes are communicated with the protection cabin.
[0009] The protection door is located in the protection cabin and is used to shield the pin holes.
[0010] The waterproof member includes a plurality of sealing members, the plurality of sealing members are located in the plurality of pin holes, the sealing member has a pin slot for the pin to pass through, and the sealing member has elasticity.
[0011] In a possible implementation, the waterproof member further includes a waterproof body, and the plurality of sealing members are fixed to the waterproof body.
[0012] The support plate covers the waterproof body.
[0013] In a possible implementation, a part of the sealing member protrudes to the outside of the pin hole and is located in the protection cabin.
[0014] In a possible implementation, the support plate further comprises a first drainage hole penetrating through the support plate towards the plurality of ribs and away from the plurality of ribs, and communicating with the protection cabin.
[0015] The support frame further comprises a first drainage pipe, one end of the first drainage pipe being fixedly connected to the side of the support plate facing the plurality of ribs and communicating with the first drainage hole.
[0016] In a possible implementation, the plurality of pin holes are arranged around the first drainage hole.
[0017] In a possible implementation, the side of the support plate facing the upper cover comprises a groove, the bottom wall and the side wall of the groove and the upper cover forming the protection cabin.
[0018] In a possible implementation, the side of the support plate facing the upper cover comprises a first sealing structure, the first sealing structure surrounding the groove.
[0019] The side of the upper cover facing the support plate comprises a second sealing structure, one of the first sealing structure and the second sealing structure being a sealing groove and the other being a sealing ring.
[0020] The socket core assembly further comprises a sealing ring, the sealing ring being located in the sealing groove, and the sealing ring extending into the sealing groove and pressing the sealing ring.
[0021] In a second aspect, the disclosure further provides a socket, the socket comprising an upper shell, a lower shell and the socket core assembly of any one of the first aspect.
[0022] The upper shell and the lower shell surround a receiving cavity, and the socket core assembly is located in the receiving cavity.
[0023] In a possible implementation, the lower shell has a second drainage hole, and two ends of the first drainage pipe respectively communicate with the first drainage hole and the second drainage hole.
[0024] In a possible implementation, the lower shell further has a second drainage pipe.
[0025] One end of the second drainage pipe is fixedly connected to the side of the lower shell facing the upper shell and communicates with the second drainage hole, and the first drainage pipe extends into the second drainage pipe.
[0026] In a possible implementation, the second drain hole is cross-shaped, the opening of the one end of the first drain pipe into the second drain pipe is also cross-shaped, and the second drain hole and the cross-shaped first drain pipe are not completely aligned.
[0027] The technical solutions provided by the present disclosure have at least the following beneficial effects:
[0028] The socket core assembly provided by the present disclosure improves the safety of the socket. The socket core assembly provided by the present disclosure is applied to a plug pin with an insulating sheath, so that even if the plug pin is located in the protective cabin, short circuit will not occur.
[0029] It should be understood that the foregoing general description and the following detailed description are only exemplary and explanatory, and cannot limit the present disclosure. BRIEF DESCRIPTION OF DRAWINGS
[0030] The accompanying drawings incorporated in the specification and constituting a part of the specification illustrate embodiments consistent with the present disclosure and serve together with the specification to explain the principles of the present disclosure. In the drawings:
[0031] Figure 1 is a structural schematic view of a socket shown by an embodiment of the present disclosure;
[0032] Figure 2 is an exploded view of a socket shown by an embodiment of the present disclosure;
[0033] Figure 3 is an exploded view of a socket core assembly shown by an embodiment of the present disclosure;
[0034] Figure 4 is a sectional view of a socket shown by an embodiment of the present disclosure;
[0035] Figure 5 is a structural schematic view of a plug shown by an embodiment of the present disclosure;
[0036] Figure 6 is a partial enlarged view of a sectional view of a socket shown by an embodiment of the present disclosure;
[0037] Figure 7 is a structural schematic view of a waterproof member shown by an embodiment of the present disclosure;
[0038] Figure 8 is a structural schematic view of a support shown by an embodiment of the present disclosure;
[0039] Figure 9 is a bottom view of a support shown by an embodiment of the present disclosure;
[0040] Figure 10 is a sectional view of a socket shown by an embodiment of the present disclosure;
[0041] Figure 11 is a structural schematic view of a support shown by an embodiment of the present disclosure;
[0042] Figure 12 is a partial enlarged view of a sectional view of a socket shown by an embodiment of the present disclosure;
[0043] Figure 13 is a structural schematic view of a lower shell shown by an embodiment of the present disclosure;
[0044] Figure 14 is a partial enlarged view of a sectional view of a socket shown by an embodiment of the present disclosure.
[0045] Legend:
[0046] 1, support, 10, protection cabin, 11, support plate, 110, bolt hole, 12, partition rib, 111, first drain hole, 112, groove, 113, first sealing structure, 13, first drain pipe, 131, annular groove, 132, through hole;
[0047] 2, bushing assembly, 21, first-pole bushing, 22, second-pole bushing, 23, third-pole bushing;
[0048] 3, upper cover, 31, second sealing structure;
[0049] 4, protection door;
[0050] 5, waterproof part, 51, plugging part, 510, bolt seam, 52, waterproof main body, 520, positioning hole;
[0051] 6, sealing ring;
[0052] 100, upper shell;
[0053] 200, lower shell, 2001, second drain hole, 2002, second drain pipe, 20021, annular protrusion;
[0054] 300, socket core assembly;
[0055] 400, plug, 401, bolt, 401a, first section, 401b, second section, 4011, insulating sheath, 402, insertion surface;
[0056] 500, cable assembly;
[0057] 600, external plug.
[0058] The specific embodiments of the present disclosure have been shown and described in the above drawings, and will be described in more detail hereinafter. These drawings and detailed description are not intended to limit the scope of the concept of the present disclosure in any way, but to explain the concept of the present disclosure to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION
[0059] In order to make the purposes, technical solutions and advantages of the present disclosure clearer, the embodiments of the present disclosure will be described in further detail below with reference to the drawings.
[0060] The terms used in the embodiments of the present disclosure are only used to explain the embodiments of the present disclosure, and are not intended to limit the present disclosure. Unless otherwise defined, the technical terms or scientific terms used herein should be understood as the general meaning understood by those skilled in the art in the field of the present disclosure. The terms "first", "second", "third" and the like used in the specification and claims of the present patent application do not represent any order, number or importance, but are only used to distinguish different components. Similarly, "one" or "a" and the like do not represent a quantity limitation, but represent the existence of at least one. The terms "include" or "contain" and the like mean that the elements or objects appearing before "include" or "contain" cover the elements or objects listed after "include" or "contain" and their equivalents, and do not exclude other elements or objects. The terms "connect" or "connected" and the like are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to represent relative positional relationships, and when the absolute position of the described object changes, the relative positional relationship may also change accordingly.
[0061] The socket is a commonly used household appliance, which is used to take power from an external power source to power other electrical appliances. As shown in Figure 1 and Figure 2 The socket includes an upper shell 100, a lower shell 200 and a socket core assembly 300, and the socket core assembly 300 is located inside the upper shell 100 and the lower shell 200. The socket core assembly 300 includes a support and a socket assembly. When the plug of the other electrical appliance is inserted into the socket assembly, power can be taken through the socket.
[0062] However, the socket in the related art is easy to enter water into the inside of the socket when it is rained or splashed with water. The water between the different polar sockets in the socket assembly is electrically connected, thereby causing the socket to be short-circuited, thereby causing an electrical hazard.
[0063] In view of the above technical problems, the present disclosure provides a socket core assembly, as shown in Figure 3 and Figure 4 The socket core assembly includes a support plate 11 and a plurality of partition ribs 12 fixedly connected to one side of the support plate 11, and the socket sleeve assembly 2 is limited between the plurality of partition ribs 12. The support plate 11 includes a plurality of plug holes 110, and the side of the support plate 11 opposite to the partition ribs 12 forms a protection cabin 10 with the upper cover 3, and the plurality of plug holes 110 communicate with the protection cabin 10. The protection door 4 is located in the protection cabin 10 and is used to shield the plug holes 110.
[0064] When the socket is in an unused state, that is, the plug is not inserted into the plug hole 110, the protection door 4 can shield the plug hole 110, thereby changing the flow direction of the water and avoiding the water flowing through the plug hole 110 to the socket sleeve assembly 2.
[0065] When the socket is in a used state, that is, the plug is inserted into the plug hole 110, the protection door 4 is pressed by the plug, so as not to shield the plug hole 110. When the water enters the protection cabin 10, it will pass through the plug hole 110 along the plug and then flow to the socket sleeve assembly 2.
[0066] Therefore, in order to improve the waterproof effect of the socket, the socket further includes a waterproof member 5. The waterproof member 5 includes a plurality of sealing members 51 located in the plurality of plug holes 110, and the sealing member 51 has a plug slot 510 for the plug to pass through, wherein the sealing member 51 has elasticity.
[0067] When the plug does not extend into the socket sleeve assembly 2, the two side walls of the plug slot 510 are in contact. When the plug extends into the socket sleeve assembly 2, the two side walls of the plug slot 510 abut against the side walls of the plug. In this way, even if the water flows into the inside of the socket, it is difficult to pass through the sealing member 51.
[0068] The socket sleeve assembly at least includes one of the first pole socket 21 and the second pole socket 22 as an N-pole socket, and the other as an L-pole socket. In some examples, the socket sleeve assembly 2 further includes a third pole socket 23, which is an E-pole socket.
[0069] The upper cover 3 and the support plate 11 can be fixedly connected by clamping.
[0070] The technical solution provided by the embodiment of the present disclosure is that, in the case where the plug does not extend into the plug hole 110, when water enters the protective cabin 10, there are no live components in the protective cabin 10, so no short circuit will occur in the protective cabin 10. At this time, the plug slit 510 is closed, thereby preventing water from passing through the plug hole 110, thereby preventing electrical connection through water inside the socket assembly 2. In the case where the plug extends into the plug hole 110, because the blocking member 51 is elastic, after the plug passes through the plug slit 510, the side walls of the plug slit 510 abut against the side walls of the plug, also preventing water from passing through the plug hole 110, thereby preventing electrical connection through water inside the socket assembly 2. In this way, the safety of the socket is improved.
[0071] The socket core assembly provided by the present disclosure is applied to a plug with an insulating sheath. Specifically, Figure 5 As shown, with the release of the new national standard GB 1002-2004, the structures of sockets and plugs have also undergone corresponding changes. For plug 400, the exterior of the plug 401 should have an insulating sheath 4011. The exterior of the first section 401a of the plug 401 has an insulating sheath 4011, and the second section 401b of the plug 401 is used to connect to the socket assembly 2. The first section 401a is the end closest to the mating surface 402. This way, the first sections 401a of the plugs 401 of different polarities do not need to be isolated by an isolation chamber and can be located in the same cavity. Therefore, even though the plug 401 is located in the protective cabin 10, a short circuit will not occur.
[0072] The following is an exemplary description of the implementation of the waterproof component 5.
[0073] In some examples, such as Figure 6 and Figure 7 As shown ( Figure 6 for Figure 4 (See a partially enlarged view of the embodiment of the present invention) The waterproof member 5 further includes a waterproof body 52, to which the plurality of blocking members 51 are fixed. In this way, the plurality of blocking members 51 can be simultaneously fixed in the latch holes 110, making the assembly process between the plurality of blocking members 51 and the plurality of latch holes 110 relatively simple.
[0074] The support plate 11 encases the waterproof body 52. The support plate 11 defines a cavity that communicates with the latch hole 110. The waterproof body 52 is secured within the cavity, and the sealing member 51 extends from the cavity into the latch hole 110. This prevents the waterproof body 52 from interfering with the socket assembly 2 or the protective door 4.
[0075] The bracket 1 and the waterproof member 5 can be integrally injection molded by using PC (Polycarbonate) and TPE (Thermoplastic Elastomer) soft glue. The waterproof member 5 is placed in the injection mold of the bracket 1, and then injection molding is performed, so that the waterproof member 5 is embedded in the cavity of the bracket 1.
[0076] As shown in Figure 7 , the waterproof body 52 has a plurality of positioning holes 520. Correspondingly, the inside of the cavity of the bracket 1 has a plurality of positioning columns which extend into the positioning holes 520, so as to realize the mutual positioning of the waterproof body 52 and the support plate 11.
[0077] In some examples, the waterproof body 52 can also be fixed to the side of the support plate 11 facing the bushing assembly 2 or the protection door 4 without hindering the bushing assembly 2 and the protection door 4.
[0078] In other examples, the waterproof member 5 can also not include the waterproof body 52, and a plurality of plugging members 51 can be fixed to the bracket 1 separately. For example, each plugging member 51 can be fixed to the latch hole 110 by means of adhesion.
[0079] In some examples, as shown in Figure 8 , a part of the plugging member 51 extends to the outside of the latch hole 110 and is located in the protection cabin 10. In this way, the water flow can be guided along the side wall of the plugging member 51 to other positions of the support plate 11, avoiding the water flow from gathering at the latch seam 510 and the latch hole 110, and further blocking the water flow.
[0080] In addition, the part of the plugging member 51 located in the protection cabin 10 can make the first section 401a of the insulating sheath 4011 of the latch 401 extend into the latch seam 510, so as to ensure that all the latches 401 in the protection cabin 10 have the insulating sheath 4011. In this way, even if water enters the protection cabin 10, the latches 401 between the protection cabins 10 will not be electrically connected through the water.
[0081] When water enters the protection cabin 10, in order to avoid the water from gathering on the support plate 11, in some examples, the support plate 11 further includes a first drainage hole 111. As shown in Figures 8-10 , the first drainage hole 111 penetrates through the side of the support plate 11 facing the partition rib 12 and the side of the support plate 11 facing away from the partition rib 12, and communicates with the protection cabin 10. The bracket 1 further includes a first drainage pipe 13, one end of the first drainage pipe 13 is fixedly connected to the side of the support plate 11 facing the plurality of partition ribs 12, and communicates with the first drainage hole 111. In this way, the water on the support plate 11 can be drained to the outside of the socket core assembly through the first drainage pipe 13. It can be understood that the waterproof body 52 also has a drainage hole opposite to the first drainage hole 111.
[0082] In some examples, as shown in Figure 11 The plurality of plug holes 110 are arranged around the first drainage hole 111. That is, the plurality of blocking members 51 are arranged around the first drainage hole 111. In this way, when water enters the protection cabin 10 along the plug, the path length of water from each blocking member 51 to the first drainage hole 111 is close, so that the water near each blocking member 51 can be quickly drained from the first drainage hole 111.
[0083] In some examples, as shown in Figure 11 The side of the support plate 11 facing the upper cover 3 includes a groove 112, and the bottom wall and the side wall of the groove 112 and the upper cover 3 form the protection cabin 10. In this way, after the water flow enters the protection cabin 10, the groove 112 of the support plate 11 can accommodate the water, avoiding the overflow of water from other positions of the protection cabin 10 due to the water flow not being able to be drained from the first drainage hole 111 in time.
[0084] In some examples, as shown in Figure 12 As shown in Figure 12 As shown in Figure 10 The side of the support plate 11 facing the upper cover 3 includes a first sealing structure 113 surrounding the groove 112. The side of the upper cover 3 facing the support plate 11 includes a second sealing structure 31, one of the first sealing structure 113 and the second sealing structure 31 is a sealing groove, and the other is a sealing ring. The socket core assembly further includes a sealing ring 6 located in the sealing groove, and the sealing ring extends into the sealing groove and presses the sealing ring 6. Thus, the water in the protection cabin 10 is prevented from flowing out from the connection between the upper cover 3 and the first support plate 11, thereby preventing the water flow in the protection cabin 10 from flowing to the socket assembly 2.
[0085] For example, the first sealing structure 113 is a sealing groove, and the second sealing structure 31 is a sealing ring.
[0086] The disclosure also provides a socket. As shown in Figure 1 and Figure 2 The socket includes an upper shell 100, a lower shell 200, and the socket core assembly 300 described above. The upper shell 100 and the lower shell 200 surround a receiving cavity, and the socket core assembly 300 is located in the receiving cavity.
[0087] The upper shell 100 has a plug hole opposite to the plug hole 110. The socket further includes a cable assembly 500 and an external plug 600. The socket core assembly 300 is electrically connected to the external plug 600 through the cable assembly 500, so that the socket can be powered from an external power source.
[0088] In some examples, as shown in Figure 13As shown, the lower shell 200 has a second drain hole 2001, and the two ends of the first drain pipe 13 are respectively connected to the first drain hole 111 and the second drain hole 2001. In this way, water in the protective cabin 10 can flow through the first drain hole 111, the first drain pipe 13, and the second drain hole 2001 in sequence, and then to the outside of the lower shell 200.
[0089] Illustratively, the first drain pipe 13 may extend into the second drain hole 2001 .
[0090] In some examples, such as Figure 13 and Figure 14 As shown ( Figure 14 for Figure 10 (See the partially enlarged view of the lower shell 200), the lower shell 200 also has a second drain pipe 2002. One end of the second drain pipe 2002 is fixedly connected to the side of the lower shell 200 facing the upper shell 100 and communicates with the second drain hole 2001. The first drain pipe 13 extends into the second drain pipe 2002, allowing all water in the first drain pipe 13 to flow into the second drain pipe 2002.
[0091] For example, Figure 14 As shown, the end of the first drain pipe 13 facing the second drain pipe 2002 has an annular groove 131 and a through hole 132. The annular groove 131 surrounds the through hole 132. The top wall of the second drain pipe 2002 facing the first drain pipe 13 has an annular protrusion 20021. The annular protrusion 20021 is located in the annular groove 131, allowing the through hole 132 to extend into the second drain pipe 2002. This ensures that all water in the first drain pipe 13 can enter the second drain pipe 2002 through the through hole 132 and then flow into the second drain hole 2001. This ensures a good seal between the first drain pipe 13 and the second drain pipe 2002, preventing water from flowing out of the connection between the first drain pipe 13 and the second drain pipe 2002.
[0092] In some examples, such as Figure 14 As shown, the second drain hole 2001 is cross-shaped, and the opening at one end of the first drain pipe 13 extending into the second drain pipe 2002 is also cross-shaped, meaning that the through hole 132 is also cross-shaped. The cross-shaped second drain hole 2001 and the first drain pipe 13 are not completely aligned, resulting in a non-perfect alignment between the second drain hole 2001 and the through hole 132. This prevents debris or water from entering the interior of the socket core assembly through the second drain hole 2001, the second drain pipe 2002, and the first drain hole 111.
[0093] The above descriptions are merely optional embodiments of the present disclosure and are not intended to limit the present disclosure. Any modifications, equivalent replacements, improvements, etc. made within the principles of the present disclosure shall be included in the scope of protection of the present disclosure.
Claims
1. A socket core assembly, characterized in that: The socket core assembly comprises a bracket (1), a socket assembly (2), an upper cover (3), a protective door (4) and a waterproof component (5); The bracket (1) comprises a support plate (11) and a plurality of partition ribs (12), wherein the plurality of partition ribs (12) are fixedly connected to one side of the support plate (11), and the socket assembly (2) is limitedly located between the plurality of partition ribs (12); The support plate (11) includes a plurality of pin holes (110), a protective cabin (10) is formed between a side of the support plate (11) facing away from the partition rib (12) and the upper cover (3), and the plurality of pin holes (110) are connected to the protective cabin (10); The protection door (4) is located in the protection cabin (10) and is used to cover the latch hole (110); The waterproof member (5) comprises a plurality of blocking members (51), the plurality of blocking members (51) being located in the plurality of latch holes (110), the blocking members (51) having latch slits (510), the latch slits (510) being used for allowing latches to pass through, wherein the blocking members (51) are elastic.
2. The socket core assembly according to claim 1, wherein: The waterproof member (5) further comprises a waterproof body (52), and the plurality of blocking members (51) are all fixed to the waterproof body (52); The support plate (11) covers the waterproof body (52).
3. The socket core assembly according to claim 2, wherein: A portion of the blocking member (51) extends out of the latch hole (110) and is located in the protective cabin (10).
4. The socket core assembly according to any one of claims 1 to 3, characterized in that: The support plate (11) further comprises a first drainage hole (111), the first drainage hole (111) penetrating a side of the support plate (11) facing the partition rib (12) and a side facing away from the partition rib (12), and communicating with the protective cabin (10); The bracket (1) further comprises a first drainage pipe (13), one end of which is fixedly connected to a surface of the support plate (11) facing the plurality of partition ribs (12) and is connected to the first drainage hole (111).
5. The socket core assembly according to claim 4, wherein: The plurality of pin holes (110) are arranged around the first drainage hole (111).
6. The socket core assembly according to any one of claims 1 to 3, characterized in that: The side of the support plate (11) facing the upper cover (3) comprises a groove (112), and the protective cabin (10) is formed between the bottom wall and side walls of the groove (112) and the upper cover (3).
7. The socket core assembly according to claim 6, wherein: A side of the support plate (11) facing the upper cover (3) includes a first sealing structure (113), and the first sealing structure (113) surrounds the groove (112); The upper cover (3) includes a second sealing structure (31) on a side facing the support plate (11), wherein one of the first sealing structure (113) and the second sealing structure (31) is a sealing groove, and the other is a sealing ring; The socket core assembly further comprises a sealing ring (6), the sealing ring (6) being located in the sealing groove, the sealing ring extending into the sealing groove and pressing the sealing ring (6).
8. A socket, characterized in that: The socket comprises an upper shell (100), a lower shell (200) and a socket core assembly (300) according to any one of claims 1 to 7; An accommodating cavity is formed between the upper shell (100) and the lower shell (200), and the socket core assembly (300) is located in the accommodating cavity.
9. The socket according to claim 8, characterized in that The socket core assembly is the socket core assembly (300) according to claim 4; The lower shell (200) further comprises a second drainage hole (2001) and a second drainage pipe (2002), one end of the second drainage pipe (2002) being fixedly connected to a side of the lower shell (200) facing the upper shell (100) and connected to the second drainage hole (2001), and the first drainage pipe (13) extending into the second drainage pipe (2002).
10. The socket according to claim 9, characterized in that The second drainage hole (2001) is in a cross shape, the opening of one end of the first drainage pipe (13) extending into the second drainage pipe (2002) is in a cross shape, and the second drainage hole (2001) is not completely aligned with the cross shape of the first drainage pipe (13).