Embedded cooking equipment

Abstract

The utility model relates to an embedded cooking device, which comprises a shell, which is provided with a left side plate, a right side plate and a base; a first air inlet groove is formed in the left side plate, a second air inlet groove is formed in the right side plate, the left side plate partially sinks inwards to form a first sunken space, and the right side plate partially sinks inwards to form a second sunken space; the base is provided with a first air inlet channel and a second air inlet channel, and the first air inlet channel and the second air inlet channel extend towards the front of the shell and penetrate through the shell. A mounting space is defined by the mounting plate and the part, located above the mounting plate, of the shell; a first communicating hole and a second communicating hole are formed in the mounting plate; the first air inlet channel, the first air inlet groove, the first concave space, the first communicating hole and the mounting space are sequentially communicated, and the second air inlet channel, the second air inlet groove, the second concave space, the second communicating hole and the mounting space are sequentially communicated; and an air inlet of the heat dissipation air duct is communicated with the mounting space. The embedded cooking equipment is high in heat dissipation efficiency.

Description

Technical Field

[0001] This application relates to the field of kitchenware technology, and in particular to built-in cooking devices. Background Technology

[0002] Built-in cooking equipment can be integrated into cabinets, offering advantages such as aesthetic appeal, small footprint, and large capacity. It effectively saves kitchen space, making the kitchen more tidy and organized.

[0003] Built-in cooking appliances generate a significant amount of heat during operation, requiring heat dissipation. To address this, built-in cooking appliances typically have a dedicated mounting space on top. The back of this space connects to the outside environment. Inside the mounting space are a cooling fan and a cooling duct. The air inlet of the cooling duct connects to the mounting space, while the air outlet faces forward and connects to the outside. When the cooling fan is operating, outside air enters the mounting space through the back of the mounting space, then flows into the cooling duct through the air inlet, and finally exits to the outside through the air outlet. This process effectively removes the heat generated by the built-in cooking appliance, achieving a cooling effect.

[0004] However, some families leave too little space in their cabinets. When built-in cooking appliances are installed in the cabinets, the gap between the back of the built-in cooking appliances and the back of the cabinets is too small, which restricts air circulation. Cold air from the outside cannot smoothly enter the installation space of the built-in cooking appliances, thus affecting the heat dissipation efficiency of the built-in cooking appliances. Utility Model Content

[0005] Therefore, it is necessary to provide an embedded cooking device to address the above problems.

[0006] To address the above problems, this application provides the following technical solution:

[0007] An embedded cooking device, the embedded cooking device comprising:

[0008] The outer casing has a left side panel, a right side panel, and a base. A first air intake groove is provided on the outer side of the left side panel, and a second air intake groove is provided on the outer side of the right side panel. A portion of the left side panel is recessed inward to form a first recessed space, with its top side open. A portion of the right side panel is also recessed inward to form a second recessed space, with its top side open. The base has a first air intake channel and a second air intake channel, both of which extend forward and penetrate the outer casing.

[0009] A mounting plate is located inside the outer casing and fixedly connected to the outer casing. The mounting plate and the portion of the outer casing above the mounting plate together enclose an installation space. The mounting plate is located directly above and close to the first and second recessed spaces. The mounting plate is provided with a first connecting hole and a second connecting hole. The first air intake channel, the first air intake groove, the first recessed space, the first connecting hole, and the installation space are sequentially connected. The second air intake channel, the second air intake groove, the second recessed space, the second connecting hole, and the installation space are also sequentially connected.

[0010] A heat dissipation duct, fixed to the mounting plate, has an air inlet and an air outlet. The air inlet communicates with the mounting space, and the air outlet faces forward and communicates with the outside.

[0011] A cooling fan is fixedly installed in the cooling duct, and the cooling fan has cooling fan blades located inside the cooling duct.

[0012] This built-in cooking device has at least the following beneficial effects:

[0013] After the built-in cooking device is installed in the cabinet, even if the space left in the cabinet for its installation is too small, the cool air in front of the built-in cooking device can still enter the installation space in two ways during the operation of the cooling fan. One airflow enters the installation space sequentially through the first air intake channel, the first air intake slot, the first recessed space, and the first connecting hole; the other airflow enters the installation space sequentially through the second air intake channel, the second air intake slot, the second recessed space, and the second connecting hole. Both airflows ultimately enter the cooling duct through the air inlet and exit through the air outlet, thereby cooling the cooking device. In short, this cooking device ensures that cool air from outside can smoothly enter the installation space of the built-in cooking device, thus guaranteeing its heat dissipation efficiency.

[0014] Furthermore, users can place their hands into the first and second recessed spaces respectively and press against the mounting plate to apply force to the built-in cooking device. In other words, the first and second recessed spaces and the mounting plate together act as handles, which makes it convenient for users to move the built-in cooking device and eliminates the need for handles, thus reducing costs.

[0015] In one embodiment, the base portion protrudes downward to form a support portion, the bottom side of which is located below the left side plate and the right side plate; the bottom side of the support portion is located in the same plane, and the space between the portion of the base other than the support portion and the plane where the bottom side of the support portion is located is an air venting space; the first air intake channel and the second air intake channel are both provided in the support portion and are both connected to the air venting space; the first air intake groove extends to the bottom end of the left side plate to communicate with the air venting space, and the second air intake groove extends to the bottom end of the right side plate to communicate with the air venting space.

[0016] With this configuration, the support unit serves to elevate the cabinet. When the support unit is supported against the bottom wall of the cabinet, the first air intake channel and the first air intake slot can be connected through the air passage, and the second air intake channel and the second air intake slot can be connected through the air passage.

[0017] In one embodiment, the first air intake groove extends from the first recessed space to the front of the bottom end of the left side plate.

[0018] This design allows cold air from the lower front of the embedded cooking device to enter the first air intake slot, thus improving the heat dissipation efficiency of the embedded cooking device.

[0019] In one embodiment, the second air intake groove extends from the second recessed space to the front of the bottom end of the right side plate.

[0020] This design allows cold air from the lower front of the embedded cooking device to enter the second air intake slot, thus improving the heat dissipation efficiency of the embedded cooking device.

[0021] In one embodiment, the first recessed space and the second recessed space are positioned opposite each other.

[0022] This design allows users to apply force to the built-in cooking device with both hands in the first and second recessed spaces.

[0023] In one embodiment, multiple first recessed spaces and multiple first air intake slots are provided, and the first recessed spaces and the first air intake slots are provided in a one-to-one correspondence.

[0024] This design allows more cool air to enter the installation space, which helps improve the heat dissipation efficiency of the built-in cooking equipment.

[0025] In one embodiment, two adjacent first recessed spaces are interconnected.

[0026] This design allows more cool air to enter the installation space, which helps improve the heat dissipation efficiency of the built-in cooking equipment.

[0027] In one embodiment, multiple second recessed spaces and multiple second air inlet slots are provided, and the second recessed spaces and the second air inlet slots are arranged in a one-to-one correspondence.

[0028] This design allows more cool air to enter the installation space, which helps improve the heat dissipation efficiency of the built-in cooking equipment.

[0029] In one embodiment, two adjacent second recessed spaces are interconnected.

[0030] This design allows more cool air to enter the installation space, which helps improve the heat dissipation efficiency of the built-in cooking equipment.

[0031] In one embodiment, there are two of each of the first recessed space, the first air inlet groove, the second recessed space, and the second air inlet groove, and they are arranged in a one-to-one correspondence. The first recessed space and the second recessed space are arranged opposite each other.

[0032] With this configuration, when it is necessary to lift the built-in cooking device, one person's hands can apply force to the built-in cooking device in a set of corresponding first and second recessed spaces, while another person's hands can apply force to the built-in cooking device in another set of corresponding first and second recessed spaces, making it easy for two people to work together to lift the built-in cooking device. Attached Figure Description

[0033] Figure 1 This is a perspective view of an embedded cooking device according to an embodiment of this application;

[0034] Figure 2 for Figure 1 A three-dimensional schematic diagram of the embedded cooking device shown from another perspective;

[0035] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0036] Figure 4 for Figure 2 Enlarged view of point B in the middle;

[0037] Figure 5 for Figure 1 A three-dimensional schematic diagram of the embedded cooking device shown from another perspective;

[0038] Figure 6 for Figure 5 A three-dimensional schematic diagram of the embedded cooking device shown from another perspective;

[0039] Figure 7 for Figure 1 The front view of the embedded cooking device shown;

[0040] Figure 8 for Figure 7 Enlarged view of point C in the middle;

[0041] Figure 9 for Figure 7 The embedded cooking device shown is a cross-sectional view at the DD section position;

[0042] Figure 10 for Figure 1 An exploded view of the embedded cooking device shown.

[0043] Figure label:

[0044] 1. Outer shell; 11. Left side panel; 111. First air intake slot; 112. First recessed space; 12. Right side panel; 121. Second air intake slot; 122. Second recessed space; 13. Base; 131. First air intake channel; 132. Second air intake channel; 133. Support part; 134. Air outlet space; 2. Mounting plate; 21. First connecting hole; 22. Second connecting hole; 3. Mounting space; 4. Heat dissipation duct; 41. Air inlet; 42. Air outlet; 5. Heat dissipation fan; 51. Heat dissipation fan blades. Detailed Implementation

[0045] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0046] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0047] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0048] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0049] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0050] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0051] See Figures 1 to 10 This application provides an embedded cooking device suitable for use in cabinetry. The embedded cooking device includes a housing 1, a mounting plate 2, a heat dissipation duct 4, and a heat dissipation fan 5.

[0052] See Figure 1 , Figure 2 , Figure 5 , Figure 6 , Figure 8 and Figure 10The outer casing 1 has a left side plate 11, a right side plate 12, and a base 13. A first air intake groove 111 is provided on the outer side of the left side plate 11, and a second air intake groove 121 is provided on the outer side of the right side plate 12. A portion of the left side plate 11 is recessed inward to form a first recessed space 112, the top side of which is open. A portion of the right side plate 12 is recessed inward to form a second recessed space 122, the top side of which is open. The base 13 has a first air intake channel 131 and a second air intake channel 132, both extending forward of the outer casing 1 and penetrating through it.

[0053] See Figure 9 and Figure 10 The mounting plate 2 is located inside the outer casing 1 and is fixedly connected to the outer casing 1. The portion of the outer casing 1 above the mounting plate 2 together encloses the mounting space 3. The mounting plate 2 is located directly above and close to the first recessed space 112 and the second recessed space 122, that is, the mounting plate 2 is close to the top side of the first recessed space 112 and the top side of the second recessed space 122. The mounting plate 2 is provided with a first connecting hole 21 and a second connecting hole 22. The first air intake channel 131, the first air intake groove 111, the first recessed space 112, the first connecting hole 21 and the mounting space 3 are connected in sequence, and the second air intake channel 132, the second air intake groove 121, the second recessed space 122, the second connecting hole 22 and the mounting space 3 are connected in sequence.

[0054] See Figure 9 and Figure 10 The heat dissipation duct 4 is fixed to the mounting plate 2. The heat dissipation duct 4 has an air inlet 41 and an air outlet 42. The air inlet 41 is connected to the mounting space 3, and the air outlet 42 faces forward and is connected to the outside.

[0055] See Figure 9 The cooling fan 5 is fixed in the cooling air duct 4. The cooling fan 5 has cooling fan blades 51, which are located inside the cooling air duct 4.

[0056] After the built-in cooking device is embedded in the cabinet, even if the space left in the cabinet for its installation is too small, the cool air in front of the built-in cooking device can enter the installation space 3 of the built-in cooking device in two ways during the operation of the cooling fan 5. One airflow enters the installation space 3 sequentially through the first air intake channel 131, the first air intake groove 111, the first recessed space 112, and the first connecting hole 21. The other airflow enters the installation space 3 sequentially through the second air intake channel 132, the second air intake groove 121, the second recessed space 122, and the second connecting hole 22. Both airflows ultimately enter the cooling duct 4 through the air inlet 41 and are discharged from the cooling duct 4 through the air outlet 42, thereby cooling the cooking device. In short, this cooking device ensures that cool air from the outside can smoothly enter the installation space 3 of the built-in cooking device, thus ensuring the heat dissipation efficiency of the built-in cooking device.

[0057] Furthermore, users can place their hands into the first recessed space 112 and the second recessed space 122 respectively and press against the mounting plate 2 to apply force to the built-in cooking device. In other words, the first recessed space 112, the second recessed space 122 and the mounting plate 2 together act as handles, which makes it convenient for users to move the built-in cooking device and eliminates the need for handles, thus reducing costs.

[0058] For example, the built-in cooking device is a built-in steam oven / built-in oven / built-in steam oven / built-in microwave-steam-oven combo.

[0059] For example, the distance between the mounting plate 2 and the top side of the first recessed space 112 is less than or equal to 2 mm, and the distance between the mounting plate 2 and the top side of the second recessed space 122 is less than or equal to 2 mm, which makes it convenient for the user to press their finger on the mounting plate 2.

[0060] Preferably, the first recessed space 112 has a front-to-back dimension greater than or equal to 80 mm, and the second recessed space 122 has a front-to-back dimension greater than or equal to 80 mm, so as to facilitate the user to put their hand into the first recessed space 112 and the second recessed space 122.

[0061] Optionally, if the user only needs to insert three fingers of each hand into the first recessed space 112 and the second recessed space 122 to apply force to move the built-in cooking device (i.e., the built-in cooking device is relatively light), the dimensions of the first recessed space 112 in the front-back direction can also be between 60mm and 80mm, and the dimensions of the second recessed space 122 in the front-back direction can also be between 60mm and 80mm.

[0062] See Figure 3 and Figure 6Multiple first connecting holes 21 and second connecting holes 22 are provided. The diameter of each first connecting hole 21 is less than or equal to 4 mm, and the diameter of each second connecting hole 22 is less than or equal to 4 mm. This helps to prevent the first connecting holes 21 and second connecting holes 22 from affecting the user's application of force to the mounting plate 2. In other embodiments, the first connecting hole 21 and second connecting hole 22 can both be very narrow elongated holes, for example, the width of both the first connecting hole 21 and second connecting hole 22 is less than or equal to 2 mm.

[0063] See Figure 3 and Figure 6 The first recessed space 112 is formed by a portion of the left side plate 11 tilting inward, and the first recessed space 112 is wedge-shaped. The second recessed space 122 is formed by a portion of the right side plate 12 tilting inward, and the second recessed space 122 is wedge-shaped. In other embodiments, the first recessed space 112 and the second recessed space 122 may also be semi-cylindrical.

[0064] See Figure 2 , Figure 4 and Figure 8 The base 13 protrudes downward to form a support portion 133, the bottom of which is located below the left side panel 11 and the right side panel 12. The bottom of the support portion 133 lies in the same plane. The space between the portion of the base 13 excluding the support portion 133 and the plane containing the bottom of the support portion 133 forms an air passage space 134. The first air intake channel 131 and the second air intake channel 132 are both located on the support portion 133 and communicate with the air passage space 134. The first air intake groove 111 extends to the bottom end of the left side panel 11 to communicate with the air passage space 134, and the second air intake groove 121 extends to the bottom end of the right side panel 12 to communicate with the air passage space 134. Thus, the support portion 133 serves to elevate the cabinet. When the support portion 133 is supported against the bottom wall of the cabinet, the first air intake channel 131 and the first air intake groove 111 are connected through the air passage space 134, and the second air intake channel 132 and the second air intake groove 121 are also connected through the air passage space 134.

[0065] In some embodiments, the air vent 134 is a single space. In other embodiments, the air vent 134 includes two spaced-apart subspaces, with a first air intake channel 131 and a first air intake slot 111 communicating with one of the subspaces, and a second air intake channel 132 and a second air intake slot 121 communicating with the other subspace.

[0066] See Figure 1 The first air intake slot 111 extends from the first recessed space 112 to the front of the bottom end of the left side plate 11. This facilitates the entry of cold air from the lower front of the embedded cooking device into the first air intake slot 111, thereby improving the heat dissipation efficiency of the embedded cooking device.

[0067] See Figure 5 The second air intake slot 121 extends from the second recessed space 122 to the front of the bottom end of the right side plate 12. This facilitates the entry of cold air from the lower front of the embedded cooking device into the second air intake slot 121, thereby improving the heat dissipation efficiency of the embedded cooking device.

[0068] Preferably, the first recessed space 112 and the second recessed space 122 are positioned opposite each other. This facilitates the user's hands applying force to the embedded cooking device using the first recessed space 112 and the second recessed space 122.

[0069] In some embodiments, multiple first recessed spaces 112 and first air inlet slots 111 are provided, and the first recessed spaces 112 and first air inlet slots 111 are arranged in a one-to-one correspondence. This facilitates the entry of more cold air into the installation space 3, which helps to improve the heat dissipation efficiency of the embedded cooking device.

[0070] In some embodiments, two adjacent first recessed spaces 112 are interconnected. This allows more cold air to enter the installation space 3, which helps improve the heat dissipation efficiency of the embedded cooking device.

[0071] In some embodiments, multiple second recessed spaces 122 and second air inlet slots 121 are provided, and the second recessed spaces 122 and second air inlet slots 121 are arranged in a one-to-one correspondence. This facilitates the entry of more cold air into the installation space 3, which helps to improve the heat dissipation efficiency of the embedded cooking device.

[0072] In some embodiments, two adjacent second recessed spaces 122 are interconnected. This allows more cold air to enter the installation space 3, which helps improve the heat dissipation efficiency of the embedded cooking device.

[0073] In some embodiments, two of each of the first recessed space 112, the first air inlet slot 111, the second recessed space 122, and the second air inlet slot 121 are provided and are arranged in a one-to-one correspondence, with the corresponding first recessed spaces 112 and second recessed spaces 122 facing each other. In this way, when it is necessary to lift the embedded cooking device, one person's hands can apply force to the embedded cooking device in one set of corresponding first recessed spaces 112 and second recessed spaces 122, while another person's hands can apply force to the embedded cooking device in another set of corresponding first recessed spaces 112 and second recessed spaces 122, making it easy for two people to lift the embedded cooking device together.

[0074] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0075] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of protection of this application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these modifications and improvements all fall within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the appended claims.

Claims

1. An embedded cooking device, characterized in that, include: The outer casing (1) has a left side plate (11), a right side plate (12), and a base (13); the outer side of the left side plate (11) is provided with a first air inlet groove (111), the outer side of the right side plate (12) is provided with a second air inlet groove (121), a portion of the left side plate (11) is recessed inward to form a first recessed space (112), the top side of the first recessed space (112) is open, a portion of the right side plate (12) is recessed inward to form a second recessed space (122), the top side of the second recessed space (122) is open; the base (13) is provided with a first air inlet channel (131) and a second air inlet channel (132), both the first air inlet channel (131) and the second air inlet channel (132) extend toward the front of the outer casing (1) and penetrate the outer casing (1); Mounting plate (2) is located inside the outer shell (1) and fixedly connected to the outer shell (1). The portion of the mounting plate (2) and the outer shell (1) above the mounting plate (2) together enclose the mounting space (3). The mounting plate (2) is located directly above the first recessed space (112) and the second recessed space (122) and is located close to the first recessed space (112) and the second recessed space (122). The mounting plate (2) is provided with a first connecting hole (21) and a second connecting hole (22). The first air intake channel (131), the first air intake groove (111), the first recessed space (112), the first connecting hole (21) and the mounting space (3) are connected in sequence. The second air intake channel (132), the second air intake groove (121), the second recessed space (122), the second connecting hole (22) and the mounting space (3) are connected in sequence. A heat dissipation duct (4) is fixed to the mounting plate (2). The heat dissipation duct (4) has an air inlet (41) and an air outlet (42). The air inlet (41) communicates with the mounting space (3), and the air outlet (42) faces forward and communicates with the outside. A cooling fan (5) is fixed in the cooling duct (4). The cooling fan (5) has cooling fan blades (51) located inside the cooling duct (4).

2. The embedded cooking device according to claim 1, characterized in that, The base (13) protrudes downward to form a support (133), the bottom of which is located below the left side plate (11) and the right side plate (12). The bottom of the support (133) is located in the same plane. The space between the part of the base (13) other than the support (133) and the plane where the bottom of the support (133) is located is an air passage (134). The first air intake channel (131) and the second air intake channel (132) are both located on the support (133) and are connected to the air passage (134). The first air intake groove (111) extends to the bottom of the left side plate (11) to connect with the air passage (134), and the second air intake groove (121) extends to the bottom of the right side plate (12) to connect with the air passage (134).

3. The embedded cooking device according to claim 2, characterized in that, The first air intake groove (111) extends from the first recessed space (112) to the front of the bottom end of the left side plate (11).

4. The embedded cooking device according to claim 2, characterized in that, The second air intake groove (121) extends from the second recessed space (122) to the front of the bottom end of the right side plate (12).

5. The embedded cooking device according to claim 1, characterized in that, The first recessed space (112) and the second recessed space (122) are positioned opposite each other.

6. The embedded cooking device according to claim 1, characterized in that, Multiple first recessed spaces (112) and first air inlet slots (111) are provided, and the first recessed spaces (112) and first air inlet slots (111) are provided in a one-to-one correspondence.

7. The embedded cooking device according to claim 6, characterized in that, The two adjacent first recessed spaces (112) are interconnected.

8. The embedded cooking device according to claim 1, characterized in that, Multiple second recessed spaces (122) and multiple second air inlet slots (121) are provided, and the second recessed spaces (122) and the second air inlet slots (121) are provided in a one-to-one correspondence.

9. The embedded cooking device according to claim 8, characterized in that, The two adjacent second recessed spaces (122) are interconnected.

10. The embedded cooking device according to claim 1, characterized in that, The first recessed space (112), the first air inlet groove (111), the second recessed space (122), and the second air inlet groove (121) are all provided in pairs and are arranged in a one-to-one correspondence. The first recessed space (112) and the second recessed space (122) are arranged opposite each other.

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