A soymilk machine

Abstract

The application relates to the field of kitchen appliances, in particular to a soybean milk machine which comprises a cup body, a shell and a handle, the shell is sleeved outside the cup body, the handle is connected to the outer wall of the shell, the shell comprises a shell body and a protruding ring integrally formed on the upper end of the shell body, the protruding ring is arranged around the circumferential wall of the shell body and the cross-sectional profile of the protruding ring is arc-shaped, the handle is integrally formed on the protruding ring, and the connecting end of the handle extends to the shell body from the protruding ring. The protruding ring is integrally formed on the upper end of the shell body, the handle is integrally formed on the protruding ring, and the connecting end of the handle extends to the shell body from the protruding ring, so that the problem that the connection strength of the handle and the shell is weakened due to long-time and high-frequency hand holding of the handle of the existing soybean milk machine can be solved.

Description

Technical Field

[0001] This application relates to the field of kitchen appliance technology, and more particularly to a soymilk maker. Background Technology

[0002] Existing soymilk makers, especially bottom-mounted ones, have their main components located at the bottom of the casing and on the cup body. Therefore, the strength and load-bearing capacity of the handle are crucial. The handle of existing soymilk makers is attached to the outside of the casing at the top or both ends. When the user lifts the handle, the connection between the handle and the casing (especially the connection between the top of the handle and the casing) is subjected to stress. Over long-term use, the stress on the connection between the casing and the handle, as well as the aging of the material, can cause cracks to appear inside the casing. With repeated and frequent lifting of the handle, the connection strength between the handle and the casing will weaken, potentially leading to the handle breaking off and posing a safety risk to the user. Utility Model Content

[0003] This application provides a soymilk maker that can solve the safety risk problem of existing soymilk makers where the connection between the handle and the shell is prone to cracking due to stress and material aging caused by long-term use, resulting in the handle falling off and breaking off from the shell.

[0004] This application provides a soymilk maker, including a cup body, a shell, and a handle. The shell is fitted onto the outside of the cup body, and the handle is connected to the outer wall of the shell. The shell includes a shell body and a convex ring integrally formed on the upper end of the shell body. The convex ring is arranged around the peripheral wall of the shell body and the cross-sectional profile of the convex ring is arc-shaped. The handle is integrally formed on the convex ring, and the connecting end of the handle extends from the convex ring to the shell body.

[0005] Compared to existing technologies, this application features a convex ring integrally formed on the upper part of the shell body, with the handle integrally formed on the convex ring, and the handle's connecting end extending from the convex ring to the shell body. This structure, on the one hand, ensures that the handle's connecting end is connected to both the convex ring and the shell body, employing a multi-point connection method. This enhances the connection strength between the handle's connecting end and the shell body and the convex ring, preventing breakage at the handle-shell connection due to stress. On the other hand, the handle's integral formation with the convex ring enhances the vibration resistance of the top of the soymilk maker, reducing noise caused by vibration. Furthermore, compared to structures that connect the handle and shell with screws, the integral formation of the handle and convex ring in this application reduces the likelihood of breakage at the connection due to long-term vibration, improving the user experience.

[0006] In addition, this application has an integrally formed raised ring on the upper end of the shell body. The raised ring and the shell body form an inwardly concave annular depression. When the liquid overflows from the soymilk maker, the liquid will preferentially flow into the annular depression, and then the annular depression will provide a certain degree of adhesion and blockage, which can delay the time for the liquid to flow to the bottom of the shell body. Even when the amount of liquid overflow is small, the liquid can stay in the annular depression and will not flow to the bottom of the shell body, so as to facilitate the user's cleaning.

[0007] Moreover, compared to existing technologies, the convex ring in this application enhances the pressure resistance of the top of the casing, preventing deformation of the upper part of the casing due to frequent opening and closing of the lid or external pressure, effectively improving the deformation resistance of the upper part of the casing. In addition, the cross-sectional profile of the convex ring is arc-shaped, making the upper part of the soymilk maker casing form a honey pot shape, making the upper part of the soymilk maker more three-dimensional and beautiful, and enhancing the overall aesthetics of the machine.

[0008] As a preferred technical solution, the convex rings include a plurality of rings distributed along the axial direction of the shell body, and a recess is formed between two adjacent convex rings. The connecting end extends sequentially from the surface of one of the convex rings to the surface of the recess and the surface of the other convex ring.

[0009] By setting multiple protrusions and extending the connection end to cover all protrusions and the recesses formed between them, the connection strength between the handle and the housing can be further improved. Moreover, the multiple protrusions are distributed along the axial direction of the housing body, which can provide support for the handle at multiple positions when the handle is subjected to axial force, so as to avoid the connection between the handle and the housing breaking due to axial force.

[0010] In addition, a depression is formed between two adjacent convex rings. When the liquid in the soymilk maker overflows, the liquid will preferentially flow into the depression between the two adjacent convex rings. The depression will then act as an adhesive barrier to a certain extent. Combined with the retention effect of the depression between the convex ring and the shell body, the overflowing liquid can be completely retained in multiple depressions and will not flow to the bottom of the shell body.

[0011] As a preferred technical solution, the thickness of the convex ring is 3mm-5mm.

[0012] The thickness of the convex ring not only improves the connection strength of the handle, but also allows the recess between two adjacent convex rings to have a certain depth. This helps to contain the overflowing liquid when it spills out of the soymilk maker, preventing it from flowing down to the bottom of the shell.

[0013] As a preferred technical solution, the thickness of the convex ring is 1.2-1.5 times the thickness of the shell body.

[0014] As a preferred technical solution, the total height of the plurality of convex rings is 10mm-25mm, and the height of a single convex ring is 3mm-8mm.

[0015] As a preferred technical solution, the inner wall of the shell body is provided with an annular support plate corresponding to the position of the convex ring, and a sealing ring is supported on the annular support plate between the inner wall of the shell body and the outer wall of the cup body.

[0016] The sealing ring is supported by an annular support plate. The sealing ring is clamped between the inner wall of the shell body and the outer wall of the cup body. It can not only meet the sealing requirements between the cup body and the shell body, but also provide the force to support the side wall of the shell body when the handle is carried, so as to counteract the lateral force at the handle connection position and reduce the deformation of the handle connection position due to lateral force.

[0017] As a preferred technical solution, the cup body is provided with a flange that overlaps the end face of the shell body, and the convex ring is located below the flange.

[0018] As a preferred technical solution, a gripping opening is formed between the lower end of the handle and the outer wall of the shell body;

[0019] Alternatively, the lower end of the handle is connected to the lower end of the shell body.

[0020] As a preferred technical solution, the soymilk maker further includes an upper cover, which includes a cover body and a vent cover. The cover body is fastened to the upper opening of the cup body, and the top surface of the cover body is recessed downward to form a groove. The bottom wall of the groove is provided with a through hole. The vent cover is fitted onto the groove and forms a venting cavity with the groove. The venting cavity is connected to the inner cavity of the cup body through the through hole. The vent cover is provided with a vent hole that connects to the venting cavity, and the vent cover is provided with a ring handle.

[0021] The ventilation chamber and ventilation holes allow for the rapid expulsion of gas from inside the soymilk maker. The ring handle on the ventilation cover also makes it easy for users to lift the cover during cleaning, thus improving the user experience.

[0022] As a preferred technical solution, the vent cover includes a cover plate that overlaps the groove, and an annular plate that extends downward from the bottom of the cover plate and is supported on the bottom wall of the groove. The side wall of the annular plate is provided with a communication port, and the vent cavity is formed between the annular plate, the cover plate and the side wall of the groove, and the vent cavity is connected to the through hole through the communication port.

[0023] Furthermore, by setting a connecting port on the side wall of the annular plate, the gas inside the cup flows into the venting chamber through the through hole on the cover, the internal channel of the annular plate, and the connecting port in sequence, and then flows to the venting holes of the venting cover through the connecting port in a circumferential direction. This can reduce the noise generated by the exhaust while exhausting the gas. Attached Figure Description

[0024] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0025] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a three-dimensional structural diagram of the soymilk maker described in the embodiments of this application;

[0027] Figure 2 This is a cross-sectional view of the soymilk maker described in the embodiments of this application;

[0028] Figure 3 Examples of this application Figure 2 Enlarged view of point A;

[0029] Figure 4 This is a schematic diagram of the structure in which the lower end of the handle of the soymilk maker described in this application forms a gripping opening between the lower end of the handle and the shell body;

[0030] Figure 5 This is a schematic diagram of the structure of the handle of the soymilk maker described in this application being connected to the shell body at the lower end;

[0031] Figure 6 This is a three-dimensional structural diagram of the top cover of the soymilk maker described in an embodiment of this application;

[0032] Figure 7 This is a cross-sectional view of the top cover of the soymilk maker described in the embodiment of this application;

[0033] Figure 8 This is a three-dimensional structural diagram of a soybean milk maker with another structure as described in an embodiment of this application;

[0034] Figure 9 This is a cross-sectional view of another structure of a soymilk maker as described in an embodiment of this application;

[0035] Figure 10 Examples of this application Figure 9 Enlarged diagram of point B.

[0036] in:

[0037] 1. Cup body; 11. Flanged edge; 2. Shell; 21. Shell body; 211. Annular support plate; 22. Convex ring; 221. Recess; 23. Annular recess; 24. Sealing ring; 3. Handle; 4. Crushing device; 5. Motor; 6. Top cover; 61. Cover body; 611. Groove; 612. Through hole; 62. Vent cover; 621. Vent hole; 622. Annular handle; 623. Cover plate; 624. Annular plate; 625. Connecting port. Detailed Implementation

[0038] To better understand the above-mentioned objectives, features, and advantages of this application, the solution of this application will be further described below. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0039] Many specific details are set forth in the following description in order to provide a full understanding of this application, but this application may also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only some embodiments of this application, and not all embodiments.

[0040] To improve the connection strength between the handle and the body of the soymilk maker, and to prevent the connection from weakening and breaking due to frequent and prolonged handling, this application provides a soymilk maker, such as... Figure 1 and Figure 2 As shown, where Figure 1 This is a three-dimensional structural diagram of the soymilk maker described in the embodiments of this application; Figure 2 This is a cross-sectional view of the soymilk maker described in an embodiment of this application. The soymilk maker includes a cup body 1, a shell 2, and a handle 3. The cup body 1 is installed inside the shell 2, and a heating element is provided at the bottom of the cup body 1. A grinding device 4 is installed inside the cup body 1. A motor 5 is installed at the lower end of the shell 2. The output end of the motor 5 extends into the cup body 1 through a coupling or other connecting component and is connected to the grinding device 4 inside the cup body 1 to drive the grinding device 4 to rotate and process the ingredients.

[0041] The handle 3 is integrally formed on the outer wall of the housing 2, and in this embodiment, as shown... Figure 1 and Figure 3 As shown, where Figure 3 Examples of this application Figure 2The enlarged schematic diagram at point A shows that the aforementioned housing 2 includes a housing body 21 and a protruding ring 22 integrally formed on the upper end of the housing body 21. The protruding ring 22 surrounds the peripheral wall of the housing body 21, and the cross-sectional profile of the protruding ring 22 is arc-shaped. The aforementioned handle 3 is integrally formed on the protruding ring 22, and the connecting end of the handle 3 extends from the protruding ring 22 to the housing body 21. In other words, the connecting end of the handle 3 is integrally formed with both the protruding ring 22 and the housing body 21.

[0042] Compared with the prior art, this application features a convex ring 22 integrally formed on the upper end of the shell body 21, with the handle 3 integrally formed on the convex ring 22, and the connecting end of the handle 3 extending from the convex ring 22 to the shell body 21. This structure, on the one hand, ensures that the connecting end of the handle 3 is connected to both the convex ring 22 and the shell body 21, employing a multi-point connection method. This improves the connection strength between the connecting end of the handle 3 and the shell body 21 and the convex ring 22, preventing breakage at the connection point between the handle 3 and the shell 2 due to stress. On the other hand, the integral forming of the handle 3 with the convex ring 22 enhances the vibration resistance of the top of the soymilk maker, reducing noise caused by vibration. Moreover, compared to structures that connect the handle 3 and the shell 2 with screws, the integral forming of the handle 3 and the convex ring 22 in this application reduces the probability of breakage at the connection point due to long-term vibration, thus improving the user experience.

[0043] In addition, such as Figure 3 As shown, in this embodiment of the application, a raised ring 22 is integrally formed on the upper end of the shell body 21. The raised ring 22 forms an annular recess 23 between itself and the shell body 21. When liquid overflows from the soymilk maker, the liquid will preferentially flow into the annular recess 23, where it will adhere and block the liquid to a certain extent, thus delaying the time it takes for the liquid to flow down to the bottom of the shell body 21. Even when the amount of liquid overflowing is small, the liquid can remain in the annular recess 23 and will not flow down to the bottom of the shell body 21, making it easier for the user to clean.

[0044] Moreover, compared to existing technologies, the convex ring 22 in this application enhances the pressure resistance of the top of the housing 2, preventing deformation of the upper part of the housing 2 due to frequent opening and closing of the top cover 6 or external pressure, effectively improving the deformation resistance of the upper part of the housing 2. In addition, the cross-sectional profile of the convex ring 22 is arc-shaped, making the upper part of the housing 2 of the soymilk maker form a honey pot shape, making the upper part of the soymilk maker more three-dimensional and beautiful, and enhancing the overall aesthetics of the machine.

[0045] In this embodiment, reference can be made to Figure 3The aforementioned protrusions 22 include multiple protrusions distributed along the axial direction of the shell body 21. A recess 221 is formed between two adjacent protrusions 22. The connecting end of the handle 3 extends sequentially from the surface of one of the protrusions 22 to the surface of the recess 221 and the surface of the other protrusion 22. The multiple protrusions 22 provide support for the handle 3 at multiple points when it is subjected to axial force, preventing the connection between the handle 3 and the shell 2 from breaking due to axial force. Furthermore, the multiple protrusions 22 also make the connection between the handle 3 and the shell body 21 tighter, further improving the connection strength.

[0046] Furthermore, in this embodiment, a recess 221 is formed between two adjacent convex rings 22. When the liquid in the soymilk maker overflows, the liquid will preferentially flow into the recess 221 between the two adjacent convex rings 22. The recess 221 will then provide a certain degree of adhesion and blocking. At this time, in conjunction with the retention effect of the annular recess 23 between the convex ring 22 and the shell body 21, the overflowing liquid can be completely retained in the multiple recesses 221 and the annular recess 23, and will not flow to the bottom of the shell body 21.

[0047] Preferably, such as Figure 3 As shown, the thickness T of a single convex ring 22 is 3mm-5mm, such as 3mm, 3.5mm, 4mm, 4.5mm, 5mm, etc. Considering that a thickness less than 3mm would weaken the connection between the handle 3 and the shell body 21, while a thickness greater than 5mm would make the upper part of the soymilk maker look unsightly, setting the thickness of a single convex ring 22 to 3mm-5mm improves the connection strength of the handle 3 and also ensures a certain depth in the recess 221 between adjacent convex rings 22. This allows the overflowing liquid to be contained and retained, preventing it from flowing downwards towards the shell body 21.

[0048] In this embodiment, preferably, the total height H of the plurality of protruding rings 22 is 10mm-25mm, for example, 10mm, 12mm, 15mm, 20mm, or 25mm. This total height setting ensures that the upper part of the shell body 21 is not too high, and the center of gravity of the entire soymilk maker is not too high, thereby avoiding the situation where the motor 5 vibrates more due to the high center of gravity during operation, and also making the overall appearance of the soymilk maker better. Moreover, within this total height range, the height h of a single protruding ring 22 is 3mm-8mm, for example, 3mm, 4mm, 5mm, 6mm, or 8mm.

[0049] Furthermore, the thickness of the aforementioned protrusion 22 is 1.2-1.5 times the thickness of the shell body 21, so that even if the protrusion 22 is provided, the upper end of the shell body 21 will not appear bulky and affect the aesthetics.

[0050] like Figure 3 As shown, in this embodiment, an annular support plate 211 is provided on the inner wall of the shell body 21 corresponding to the position of the protrusion 22. A sealing ring 24 is supported on the annular support plate 211 and sandwiched between the inner wall of the shell body 21 and the outer wall of the cup body 1. The sealing ring 24 can achieve a seal between the cup body 1 and the shell body 21 to prevent external dirt and water vapor from entering the shell body 21. It should also be noted that in this embodiment, the sealing ring 24 is supported by the annular support plate 211. The sealing ring 24 is clamped between the inner wall of the shell body 21 and the outer wall of the cup body 1. In addition to satisfying the seal between the cup body 1 and the shell body 21, it can also provide a force to support the side wall of the shell body 21 when the handle 3 is carried, so as to counteract the lateral force on the connection position of the handle 3 and reduce the deformation of the connection position of the handle 3 due to lateral force.

[0051] In this embodiment, the cup body 1 preferably has a flange 11 that overlaps the end face of the shell body 21, and a convex ring 22 is located below the flange 11. The top of the cup body 1 and the top of the shell body 21 are fitted together by overlapping. Of course, it can be understood that in other embodiments, the upper end of the cup body 1 may be exposed outside the shell body 21.

[0052] Furthermore, in this embodiment, a gripping opening is formed between the lower end of the handle 3 and the outer wall of the shell body 21. Figure 4 As shown), that is, the handle 3 is only integrally formed with the shell body 21 and the convex ring 22 at its upper end, and the lower end is not connected to the shell body 21, thus making it easier for the user to grip. Of course, it is also possible that the lower end of the handle 3 is connected to the lower end of the shell body 21. Figure 5 As shown in the figure, the handle 3 and the shell body 21 are in a closed connection structure, and the two form the clearance space required for the user to hold the handle 3.

[0053] The soymilk maker in this embodiment also includes a top cover 6, such as Figure 1 , Figure 6 as well as Figure 7 As shown, where Figure 6 This is a three-dimensional structural diagram of the upper cover 6 of the soymilk maker described in the embodiments of this application. Figure 7This is a cross-sectional view of the top cover 6 of the soymilk maker according to an embodiment of this application. In this embodiment, the top cover 6 is fastened to the upper opening of the cup body 1. The top cover 6 includes a cover body 61 and a vent cover 62. The cover body 61 is fastened to the upper opening of the cup body 1, with its top surface recessed downwards to form a groove 611. A through hole 612 is provided on the bottom wall of the groove 611. The vent cover 62 is fixedly fitted onto the groove 611 and forms a venting cavity with the groove 611. A vent hole 621 communicating with the venting cavity is provided on the vent cover 62. When the top cover 6 is fastened to the upper opening of the cup body 1, the venting cavity is connected to the inner cavity of the cup body 1 through the through hole 612. Therefore, during the processing of ingredients in the soymilk maker, the gas inside the inner cavity of the cup body 1 can flow into the venting cavity through the through hole 612 and then be discharged to the outside through the vent hole 621, thus avoiding excessive gas pressure inside the cup body 1 and potential safety hazards.

[0054] In this embodiment, the above-mentioned ventilated cover 62 is provided with a ring handle 622, which makes it convenient for the user to lift the ventilated cover 62 for cleaning.

[0055] In this embodiment, it can be referred to Figure 7 The aforementioned ventilated cover 62 includes a cover plate 623 that overlaps the groove 611, and the aforementioned annular handle 622 is disposed on the cover plate 623. An annular plate 624 extends downward from the bottom of the cover plate 623, the lower end of which is supported on the bottom wall of the groove 611, and the through hole 612 on the groove 611 is located within the area covered by the annular inner wall of the annular plate 624. The aforementioned ventilated cavity is formed between the annular plate 624, the cover plate 623, and the side wall of the groove 611, and a connecting opening 625 is provided on the side wall of the annular plate 624. The ventilated cavity is connected to an internal channel formed on the inner wall of the annular plate 624 through the connecting opening 625, and is also connected to the through hole 612 through the internal channel. With this structure, the gas in the cup body 1 flows into the venting chamber through the through hole 612 on the cover body 61, the internal channel of the annular plate 624, and the connecting port 625 in sequence, and then flows to the venting hole 621 of the venting cover 62 through the connecting port 625. This can reduce the noise generated by the exhaust while venting.

[0056] In addition to the above embodiments where multiple convex rings 22 are provided, in another embodiment of this application, only one convex ring 22 is provided. Specifically, as shown in... Figures 8-10 As shown, where Figure 8 This is a three-dimensional structural diagram of another type of soymilk maker according to an embodiment of this application. Figure 9 This is a cross-sectional view of another structure of a soymilk maker described in an embodiment of this application. Figure 10 Examples of this application Figure 9The enlarged schematic diagram at point B is shown. In this embodiment, only one convex ring 22 is provided, and the height h1 of the convex ring 22 is 10mm-25mm, and the thickness t of the convex ring 22 is 4mm-7mm. Similarly, an annular recess 23 is also formed between the convex ring 22 and the shell body 21. In this embodiment, the remaining structures are the same as those of the above-mentioned scheme with multiple convex rings 22, and will not be described again.

[0057] The soymilk maker provided in this application embodiment effectively solves the problem of weakened connection strength at the connection between the handle and the shell of existing soymilk makers due to frequent and prolonged handling.

[0058] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0059] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments described herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A soymilk maker, comprising a cup body, a shell, and a handle, wherein the shell is fitted over the cup body, and the handle is connected to the outer wall of the shell, characterized in that, The housing includes a housing body and a convex ring integrally formed on the upper end of the housing body. The convex ring is arranged around the peripheral wall of the housing body and the cross-sectional profile of the convex ring is arc-shaped. The handle is integrally formed on the convex ring, and the connecting end of the handle extends from the convex ring to the housing body.

2. The soymilk maker according to claim 1, characterized in that, The convex rings include a plurality of rings distributed along the axial direction of the shell body, and a recess is formed between two adjacent convex rings. The connecting end extends sequentially from the surface of one of the convex rings to the surface of the recess and the surface of the other convex ring.

3. The soy milk maker according to claim 2, characterized in that, The thickness of the convex ring is 3mm-5mm.

4. The soymilk maker according to claim 2, characterized in that, The thickness of the convex ring is 1.2-1.5 times the thickness of the shell body.

5. The soymilk maker according to claim 2, characterized in that, The total height of the plurality of said convex rings is 10mm-25mm, and the height of a single said convex ring is 3mm-8mm.

6. The soymilk maker according to claim 1, characterized in that, The inner wall of the shell body is provided with an annular support plate corresponding to the position of the convex ring, and a sealing ring is supported on the annular support plate between the inner wall of the shell body and the outer wall of the cup body.

7. The soymilk maker according to claim 1, characterized in that, The cup body has a flange that overlaps the end face of the shell body, and the convex ring is located below the flange.

8. The soymilk maker according to claim 1, characterized in that, A gripping opening is formed between the lower end of the handle and the outer wall of the shell body; Alternatively, the lower end of the handle is connected to the lower end of the shell body.

9. The soymilk maker according to claim 1, characterized in that, The soymilk maker also includes a top cover, which includes a cover body and a vent cover. The cover body is fastened to the upper opening of the cup body, and the top surface of the cover body is recessed downward to form a groove. The bottom wall of the groove is provided with a through hole. The vent cover is fitted onto the groove and forms a venting cavity with the groove. The venting cavity is connected to the inner cavity of the cup body through the through hole. The vent cover is provided with a vent hole that connects to the venting cavity, and the vent cover is provided with a ring handle.

10. The soymilk maker according to claim 9, characterized in that, The ventilated cover includes a cover plate that overlaps the groove. The bottom of the cover plate extends downward to a ring plate that is supported on the bottom wall of the groove. The side wall of the ring plate is provided with a communication port. The ventilated cavity is formed between the ring plate, the cover plate and the side wall of the groove, and the ventilated cavity is connected to the through hole through the communication port.

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