Cooking equipment

By designing a water tank plate structure with water receiving and storage sections in the cooking equipment, and combining it with heating elements to dry the condensate, the problem of frequent cleaning caused by the small volume of the condensate tank is solved, thus improving the user experience.

CN223845494UActive Publication Date: 2026-01-30NINGBO FOTILE KITCHEN WARE CO LTD
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Patent Information

Application Number
CN202520008804.X
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-01-02
Publication Date
2026-01-30
Estimated Expiration
2035-01-02

AI Technical Summary

Technical Problem

The condensate drain in existing cooking equipment has a small capacity, which means that the condensate needs to be cleaned frequently, affecting the user experience.

Method used

Design a water tank plate that includes a water receiving part and a water storage part. The water receiving part is located below the door body, and the water storage part is located below the inner tank. The volume of the water storage chamber is not limited by the volume of the door body. Combined with a heating pipe, the condensate is dried.

Benefits of technology

The increased condensate storage capacity extends the emptying cycle, reduces the frequency of condensate tank cleaning, and improves the user experience.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model relates to cooking equipment. The cooking equipment comprises an inner container, a door body and a water tank plate; the door body is connected with and covers the inner container; the water tank plate comprises a water receiving part and a water storage part which are connected, the water receiving part comprises a water receiving tank with the top end open, the water receiving part is at least partially located below the door body, the water storage part is provided with a water storage cavity communicated with the water receiving tank, and the water storage part is at least partially located below the inner container. According to the cooking equipment provided in the scheme, the water tank plate comprising the water receiving part and the water storage part is arranged, the water receiving part is arranged below the door body and used for collecting condensate water falling from the door body, and the water storage part is arranged below the inner container, so that the volume of the water storage cavity is not limited by the volume of the door body any more; compared with a water tank connected to the lower portion of the door body, the volume is greatly improved, more condensate water can be stored in the water storage cavity, and therefore the water pouring period of the water storage cavity is prolonged, the water pouring frequency of the water storage cavity is reduced, and the problem that the condensate water in the condensate water tank needs to be cleaned away frequently is solved.
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Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electrical appliances, in particular to a cooking device. BACKGROUND

[0002] When the internal temperature of a cooking device (such as a steam oven) is high, the internal water vapor will rapidly cool when it meets the surface of a cooler door body, resulting in the water vapor condensing into water droplets, i.e. condensed water. The cooking device usually has a condensed water tank arranged below the door body, which functions to collect the condensed water generated on the glass and door sealing strip in the door body and flowing down, thereby ensuring the safety of the user's cabinet.

[0003] However, due to the space limitations of the cooking device as a whole, the volume of the condensed water tank is generally small, which results in the user needing to clean the condensed water tank in a timely manner after each use, otherwise the water may flow into the cabinet, which is inconvenient for the user and greatly affects the customer's experience. UTILITARIAN CONTENT

[0004] Therefore, it is necessary to provide a cooking device in view of the problem that the condensed water in the condensed water tank of the existing cooking device needs to be cleaned frequently.

[0005] A cooking device, comprising an inner container, a door body and a water tank plate; the door body is connected to and covers the inner container; the water tank plate comprises a water receiving portion and a water storage portion connected together, the water receiving portion comprises a water receiving tank with an open top end, and the water receiving portion is at least partially located below the door body, and the water storage portion is provided with a water storage cavity in communication with the water receiving tank, and the water storage portion is at least partially located below the inner container.

[0006] In one of the embodiments, the cooking device further comprises a heating pipe arranged below the inner container, and at least part of the water storage portion is located between the inner container and the water storage portion, and the water storage portion is made of a heat-conducting material.

[0007] In one of the embodiments, a projection of the heating pipe in the vertical direction is located inside a projection of the water storage portion in the vertical direction.

[0008] In one of the embodiments, the groove wall of the water receiving tank away from the water storage portion is a flow guide surface inclined downward toward the water storage portion.

[0009] In one of the embodiments, the water storage cavity is provided with an opening facing the water receiving tank to communicate the water receiving tank and the water storage cavity.

[0010] In one embodiment, the cooking device further includes a frame, the inner pot having an open cooking cavity, the door covering the open cooking cavity when closed on the inner pot, the frame being fixedly connected to the inner pot and being on the same plane as the open cooking cavity, the frame having a through hole, and the water storage portion passing through the through hole.

[0011] In one embodiment, the length of the water receiving portion in the horizontal direction is not less than the length of the door body in the horizontal direction.

[0012] In one embodiment, the water tank plate further includes a limiting part, which is connected to the side of the water receiving part where the water storage part is located and is spaced apart from the water storage part. The frame has a limiting hole, and the limiting part partially abuts against the end face of the frame away from the door.

[0013] In one embodiment, the limiting part includes a limiting frame and a limiting tongue connected to the limiting frame. The limiting frame is connected to the water receiving part, and one end of the limiting tongue is connected to the end face of the limiting frame away from the water receiving part and extends toward the water receiving part. The limiting tongue has an inclined surface that slopes upward toward the water receiving part, and the end face of the limiting tongue toward the water receiving part abuts against the frame.

[0014] In one embodiment, the limiting tongue includes a main body with the same thickness as the limiting frame and a protrusion protruding from the main body. The inclined surface is disposed on the end face of the protrusion away from the main body. The frame also has a clearance hole communicating with the limiting hole. The clearance hole is aligned with the limiting tongue but located on the side of the limiting tongue away from the protrusion. The maximum height of the protrusion is not greater than the height of the clearance hole.

[0015] The cooking equipment provided in the above solution, by setting up a water tank plate including a water receiving part and a water storage part, with the water receiving part located below the door to collect condensate falling from the door, and the water storage part located below the inner liner, makes the volume of the water storage chamber no longer limited by the volume of the door. Compared with a water tank connected to the bottom of the door, it has a significant improvement in volume, allowing the water storage chamber to store more condensate, thereby increasing the water emptying cycle of the water storage chamber, reducing the water emptying frequency of the water storage chamber, and solving the problem of the need for frequent cleaning of condensate in the condensate tank. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a cooking device in one embodiment of this application.

[0017] Figure 2 for Figure 1 A schematic diagram of the exploded structure of a Chinese cooking device.

[0018] Figure 3 As Figure 2 Enlarged view of A in FIG. 1.

[0019] Figure 4 As Figure 2 Structure diagram of the sink plate.

[0020] Figure 5 As Figure 1 Sectional view diagram of the cooking device.

[0021] Figure 6 As Figure 1 Partial sectional view diagram of the cooking device Figure 1 .

[0022] Figure 7 As Figure 1 Partial sectional view diagram of the cooking device Figure 2 .

[0023] Explanation of the reference signs:

[0024] 100, cooking device; 110, inner container; 111, cooking cavity; 120, door body; 130, sink plate; 131, water receiving part; 1311, water receiving sink; 1312, flow guide surface; 132, water storage part; 1321, water storage cavity; 133, limiting part; 1331, limiting frame; 1332, limiting tongue; 13321, main body; 13322, protruding part; 13323, inclined surface; 134, supporting part; 135, avoiding groove; 140, heating pipe; 150, frame body; 151, through hole; 152, limiting hole; 153, avoiding hole; 160, lower supporting plate. DETAILED DESCRIPTION

[0025] In order to make the above objectives, features and advantages of the present application more apparent, specific embodiments of the present application are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be practiced in a variety of ways beyond the specific embodiments described herein without departing from the scope of the present application, and those skilled in the art can make similar improvements without departing from the technical concept of the present application, and therefore the present application is not limited to the specific embodiments disclosed below.

[0026] In the description of the application, it should be understood that, if there are these terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application.

[0027] In addition, if there are these terms "first", "second", these terms are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second" can explicitly or implicitly include at least one of the features. In the description of the application, if the term "multiple" appears, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise explicitly specified.

[0028] In this application, unless otherwise explicitly specified and limited, if there are terms such as "mounting", "connecting", "connecting", "fixing" and the like, these terms should be broadly understood. For example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0029] In this application, unless otherwise explicitly specified and limited, if there are similar descriptions such as "first feature on" or "below" the second feature, the meaning can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0030] It should be noted that if an element is referred to as being "fixed" or "set" on another element, it can be directly on the other element or there can be an intervening element. If an element is referred to as being "connected" to another element, it can be directly connected to the other element or there can be an intervening element. The terms "vertical", "horizontal", "upper", "lower", "left", "right", and similar terms as used herein for illustrative purposes only and do not indicate the only implementation.

[0031] Referring to Figure 1 , Figure 1 A structural schematic diagram of a cooking device 100 in an embodiment of the present application is shown. The cooking device 100 provided by the embodiment of the present application can be a steam oven, an oven, etc., or any other device having a cooking function.

[0032] In combination Figure 2 as shown, Figure 2 An exploded structural schematic diagram of the cooking device 100 in the embodiment of the present application is shown. The cooking device 100 includes an inner container 110, a door body 120, and a water tank plate 130. The inner container 110 includes a cooking cavity 111 with an open front end, which is used for cooking food. The door body 120 is connected to and covers the inner container 110. In this embodiment, the door body 120 is rotationally connected to the inner container 110, and when the door body 120 covers the inner container 110, the door body 120 covers the open front end of the cooking cavity 111, so that the door body 120 and the inner container 110 together enclose a sealed cooking cavity 111.

[0033] As shown in Figure 1 and Figure 2 , the water tank plate 130 includes a water receiving portion 131 and a water storage portion 132 connected together. In combination Figure 4 , the water receiving portion 131 includes a water receiving tank 1311 with an open top end, and the water receiving portion 131 is at least partially located below the door body 120. When the temperature inside the cooking cavity 111 is too high and the temperature outside the door body 120 is relatively low, the steam inside the cooking cavity 111 will condense into condensed water on the door body 120 under the action of the temperature difference. The condensed water condensed on the door body 120 can naturally fall into the water receiving tank 1311 with an open top end located below the door body 120, thereby achieving the effect of collecting condensed water on the door body 120. In combination Figure 5 and Figure 6 , the water storage portion 132 is provided with a water storage cavity 1321 in communication with the water receiving tank 1311, so that the condensed water in the water receiving tank 1311 can flow into the water storage cavity 1321. In combination Figure 1 and Figure 5As shown, the water storage part 132 is at least partially located below the inner container 110, so that the condensed water of the door body 120 can flow into the water storage cavity 1321 located below the inner container 110 through the water groove 1311. When the water storage part 132 is arranged below the inner container 110, the volume of the water storage cavity 1321 is no longer limited by the volume of the door body 120, which greatly improves the volume compared with the water groove connected below the door body 120, so that more condensed water can be stored in the water storage cavity 1321, thereby increasing the water pouring cycle of the water storage cavity 1321, reducing the water pouring frequency of the water storage cavity 1321, and solving the problem that the condensed water in the condensed water groove needs to be cleaned frequently.

[0034] As shown in Figure 1 , Figure 2 and Figure 5 , in one embodiment, the cooking device 100 further comprises a heating pipe 140 arranged below the inner container 110. The heating pipe 140 is used to generate heat, and the heat generated by the heating pipe 140 is mainly used for cooking the food materials in the cooking cavity 111. At least part of the water storage part 132 is located between the inner container 110 and the water storage part 132. The water storage part 132 is made of a heat-conducting material, so that the heat generated by the heating pipe 140 can enter the water storage cavity 1321 to dry the condensed water, thereby reducing the water amount of the condensed water in the water storage cavity 1321, further increasing the water pouring cycle of the water storage cavity 1321, reducing the water pouring frequency of the water storage cavity 1321, and solving the problem that the condensed water in the condensed water groove needs to be cleaned frequently. At the same time, the water in the water storage cavity 1321 absorbs heat during evaporation, which can effectively reduce the heat radiated by the heating pipe 140 to the cabinet and reduce the damage to the cabinet. Exemplarily, the water storage part 132 can be a metal piece with good heat conduction, but is not limited thereto.

[0035] Taking a steam oven as an example, when the user starts the steam function, the condensed water flows into the water storage cavity 1321 along the door body 120 to act as a container. When the user starts the baking function, the heating pipe 140 works, and the heat of the heating pipe 140 is transmitted to the condensed water in the water storage cavity 1321 through the water storage part 132. The water absorbs heat and evaporates to realize the drying treatment of the condensed water.

[0036] As shown in Figure 1 and Figure 2 , the cooking device 100 further comprises a lower support plate 160. The inner container 110, the heating pipe 140, the water storage part 132, and the lower support plate 160 are arranged in sequence, so that the lower support plate 160 supports the water storage part 132.

[0037] As shown in Figure 1As shown in the drawings, in one of the embodiments, the projection of the heating pipe 140 in the vertical direction is located inside the projection of the water storage part 132 in the vertical direction, at this time, the water storage cavity 1321 can absorb the heat of the heating pipe 140 to the greatest extent, thereby playing a better drying effect on the condensed water in the water storage cavity 1321, and further reducing the water amount of the condensed water in the water storage cavity 1321.

[0038] As shown in the drawings, Figure 4 , Figure 6 and Figure 7 As shown in the drawings, in one of the embodiments, the groove wall of the water collecting groove 1311 away from the water storage part 132 is a flow guide surface 1312 inclined downward toward the water storage part 132, so that the condensed water from the door body 120 can enter the inside of the water collecting groove 1311 along the flow guide surface 1312.

[0039] As shown in the drawings, Figure 6 As shown in the drawings, in one of the embodiments, the water storage cavity 1321 is provided with an opening toward the water collecting groove 1311 to communicate the water collecting groove 1311 and the water storage cavity 1321, so that the condensed water in the water collecting groove 1311 can enter the water storage cavity 1321 through the opening. As shown in the drawings, Figure 6 In the present embodiment, the opening is an opening of the water storage cavity 1321 toward the water collecting groove 1311.

[0040] As shown in the drawings, Figure 1 and Figure 2 As shown in the drawings, in one of the embodiments, the cooking device 100 further comprises a frame 150 fixedly connected to the inner container 110 and in the same plane with the opening of the cooking cavity 111, in the present embodiment, the frame 150 is used to connect a sealing strip arranged around the opening of the inner container 110, when the door body 120 covers the inner container 110, the sealing strip is pressed between the door body 120 and the inner container 110 to improve the sealing performance when the door body 120 and the inner container 110 are covered.

[0041] As shown in the drawings, Figure 2 and Figure 3 As shown in the drawings, the frame 150 is provided with a through hole 151, and the water storage part 132 is arranged through the through hole 151, so as to limit the water groove plate 130 through the frame 150, avoiding displacement of the water groove plate 130 during use of the cooking device 100.

[0042] As shown in the drawings, Figure 2 As shown in the drawings, in one of the embodiments, the length of the water collecting part 131 in the transverse direction is not less than the length of the door body 120 in the transverse direction, so that the condensed water condensed at each part of the door body 120 can drop into the water collecting groove 1311 of the water collecting part 131.

[0043] As shown in the drawings, Figure 4As shown, in the present embodiment, the length of the water receiving portion 131 in the transverse direction is greater than the length of the water storage portion 132 in the transverse direction, so as to enable the water receiving portion 131 to receive condensed water from each part of the door body 120, while avoiding the water storage portion 132 protruding in the transverse direction from the inner container 110.

[0044] As shown, Figure 4 In one embodiment, the water tank plate 130 further comprises a limiting portion 133, which is connected to one side of the water receiving portion 131 where the water storage portion 132 is arranged and is arranged in spaced relation to the water storage portion 132, as shown, Figure 3 The frame body 150 is provided with a limiting hole 152, as shown, Figure 6 and Figure 7 As shown, the limiting portion 133 is partially abutted against the end face of the frame body 150 away from the door body 120, so as to avoid displacement of the water tank plate 130 in the direction perpendicular to the plane where the frame body 150 is arranged. As shown, Figure 7 As shown, when the limiting portion 133 is partially abutted against the end face of the frame body 150 away from the door body 120, the water receiving portion 131 is abutted against the end face of the frame body 150 towards the door body 120, at this time, the water tank plate 130 is limited in both the positive direction and the reverse direction in the direction perpendicular to the plane where the frame body 150 is arranged, thereby achieving the limiting effect.

[0045] As shown, Figure 6 and Figure 7 In one embodiment, the limiting portion 133 comprises a limiting frame 1331 and a limiting tongue 1332 connected to the limiting frame 1331, the limiting frame 1331 is connected to the water receiving portion 131, and one end of the limiting tongue 1332 is connected to the end face of the limiting frame 1331 away from the water receiving portion 131 and extends towards the water receiving portion 131, the end of the limiting tongue 1332 towards the water receiving portion 131 is a free end, and the limiting tongue 1332 will have a certain deformation space when it is stressed in the height direction. The limiting tongue 1332 is provided with an inclined surface 13323 inclined upwards towards the water receiving portion 131, so as to facilitate insertion of the limiting tongue 1332 into the limiting hole 152, so that in the process of inserting the limiting tongue 1332 into the limiting hole 152, the inclined surface 13323 is in contact with the hole wall of the limiting hole 152 and gradually drives the limiting tongue 1332 to deform, thereby facilitating complete insertion of the limiting tongue 1332 into the limiting hole 152. And as shown, Figure 7 When the limiting portion 133 is completely inserted into the limiting hole 152, the force between the limiting tongue 1332 and the hole wall of the limiting hole 152 disappears, at this time, the limiting tongue 1332 is reset, and the end face of the limiting tongue 1332 towards the water receiving portion 131 is partially abutted against the frame body 150, so as to avoid movement of the water tank plate 130 towards the direction where the door body 120 is arranged.

[0046] As shown, Figure 6 and Figure 7As shown, in one of the embodiments, the limiting tongue 1332 includes a main body 13321 consistent with the thickness of the limiting frame 1331 and a protruding portion 13322 protruding from the main body 13321, and an inclined surface 13323 is arranged on the end face of the protruding portion 13322 away from the main body 13321. The frame body 150 is also provided with a relief hole 153 communicating with the limiting hole 152, the relief hole 153 is arranged in position with the limiting tongue 1332 but on the side away from the protruding portion 13322 of the limiting tongue 1332, and the maximum height of the protruding portion 13322 is not greater than the height of the relief hole 153, so that when the inclined surface 13323 is resisted by the hole wall of the limiting hole 152 to drive the limiting tongue 1332 to deform towards the direction away from the inclined surface 13323, the limiting tongue 1332 partially penetrates the relief hole 153, and the thickness of the limiting tongue 1332 is not greater than the height of the limiting hole 152 to avoid insertion.

[0047] As shown in the drawings, Figure 4 As shown, the water collecting part 131 is recessed with a relief groove 135 on the side away from the water storage part 132, which is used to reserve space for the connecting line between the door body 120 and the inner container 110, and avoid the interference of the sink plate 130 with the normal connection between the door body 120 and the inner container 110.

[0048] As shown in the drawings, Figures 4 to 6 As shown, the sink plate 130 further includes a supporting part 134 connected to the connecting part of the water collecting part 131 and the water storage part 132 and extending towards the direction away from the water collecting groove 1311, so as to increase the contact area between the sink plate 130 and the frame body 150, and make the force on the sink plate 130 uniform.

[0049] The cooking device 100 provided in the above scheme sets the sink plate 130 including the water collecting part 131 and the water storage part 132, sets the water collecting part 131 below the door body 120 for collecting the condensed water falling from the door body 120, and sets the water storage part 132 below the inner container 110, so that the volume of the water storage cavity 1321 is no longer limited by the volume of the door body 120, greatly improves the volume compared with the sink connected below the door body 120, so that more condensed water can be stored in the water storage cavity 1321, thereby increasing the water pouring period of the water storage cavity 1321 and reducing the water pouring frequency of the water storage cavity 1321, and solving the problem that the condensed water in the condensed water sink needs to be cleaned frequently.

[0050] The technical features of the above-described embodiments can be combined arbitrarily, and in order to make the description concise, not all possible combinations of the technical features in the above-described embodiments are described, however, as long as the combinations of the technical features do not exist contradictory, they should be considered as the scope of the present disclosure.

[0051] The above embodiments only express several implementation ways of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation to the patent scope of the application. It should be pointed out that for ordinary skilled persons in the art, several modifications and improvements can be made without departing from the concept of the present application, which all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A cooking apparatus, characterized by, The cooking device comprises: a liner; a door body connected to and covering the liner; and a water tank plate comprising a water receiving portion and a water storage portion connected to each other, the water receiving portion comprising a water receiving tank with an open top end and being at least partially located below the door body, the water storage portion being provided with a water storage cavity in communication with the water receiving tank and being at least partially located below the liner.

2. The cooking apparatus according to claim 1, characterized in that, The cooking device further comprises a heating pipe arranged below the liner, and at least part of the water storage portion is located between the liner and the water storage portion, and the water storage portion is made of a heat conductive material.

3. The cooking apparatus according to claim 2, characterized in that, A projection of the heating pipe in a vertical direction is located inside a projection of the water storage portion in the vertical direction.

4. The cooking apparatus according to claim 1, characterized in that, A groove wall of the water receiving tank away from the water storage portion is inclined to form a flow guide surface downwardly toward the water storage portion.

5. The cooking apparatus according to claim 1, wherein The water storage cavity is provided with an opening facing the water receiving tank to communicate the water receiving tank and the water storage cavity.

6. The cooking apparatus according to claim 1, wherein The cooking device further comprises a frame body, the liner is provided with a cooking cavity with an open top end, the door body covers the open top end of the cooking cavity when covering the liner, the frame body is fixedly connected to the liner and is in the same plane as the open top end of the cooking cavity, the frame body is provided with a through hole, and the water storage portion is arranged to pass through the through hole.

7. The cooking apparatus according to claim 6, characterized in that, A length of the water receiving portion in a transverse direction is not less than a length of the door body in the transverse direction.

8. The cooking apparatus according to claim 7, characterized in that, The water tank plate further comprises a limiting portion connected to one side of the water receiving portion provided with the water storage portion and arranged to be spaced apart from the water storage portion, the frame body is provided with a limiting hole, and the limiting portion is partially abutted to an end surface of the frame body away from the door body.

9. The cooking apparatus according to claim 8, characterized in that, The limiting portion comprises a limiting frame and a limiting tongue connected to the limiting frame, the limiting frame is connected to the water receiving portion, and one end of the limiting tongue is connected to an end surface of the limiting frame away from the water receiving portion and extends toward the water receiving portion, the limiting tongue is provided with an inclined surface inclined upwardly toward the water receiving portion, and an end surface of the limiting tongue toward the water receiving portion is partially abutted to the frame body.

10. The cooking apparatus according to claim 9, wherein, The limiting tongue comprises a main body consistent with a thickness of the limiting frame and a protruding portion protruding from the main body, the inclined surface is arranged at an end surface of the protruding portion away from the main body, and the frame body is further provided with an avoiding hole in communication with the limiting hole, the avoiding hole is arranged to be in alignment with the limiting tongue but located at a side of the limiting tongue away from the protruding portion, and a maximum height of the protruding portion is not greater than a height of the avoiding hole.