Power box assembly

Abstract

The utility model discloses a power box assembly which is used for a range hood and comprises a box body, a volute and a top cover. The box body is provided with a containing cavity with an upward opening, a first through hole is formed in a bottom plate of the containing cavity, and an outlet is formed in a side plate on one side of the containing cavity; the volute comprises a coaming and a lower cover plate, the lower cover plate and the coaming are integrally formed, a first connecting part is arranged on the upper edge of the coaming, and a second through hole is formed in the lower cover plate; the volute is installed in the containing cavity, the lower cover plate is connected with a bottom plate of the containing cavity in a sealed mode, the second through hole corresponds to the first through hole, and the size of the second through hole is smaller than that of the first through hole; the top cover is used for closing the opening of the containing cavity, the top cover is connected with the first connecting part in a sealed mode, a turbine cavity is defined by the cover plate and the volute, fluid between the turbine cavity and the containing cavity is not communicated, and the turbine cavity is communicated with the outside through the outlet. The power box assembly can improve the smoke exhaust effect when the power box assembly is applied to the range hood.

Description

Technical Field

[0001] The utility model relates to the technical field of range hoods, and particularly to a power box assembly. Background Art

[0002] As a ventilation fan used as a relay device for a range hood, it has the function of assisting the range hood in exhausting oil fumes. It is usually installed at the upper end of the range hood and is located in a cabinet or a kitchen ceiling. In the related art, the ventilation fan includes a box body and a turbine module installed therein. Affected by the assembly process, the assembly sealing performance between the box body and the turbine module is poor, resulting in easy fluid communication between the inside of the turbine module and the box body, affecting the negative pressure generated on the air inlet side of the turbine module, and further affecting the smoke exhaust capacity of the ventilation fan. Summary of the Utility Model

[0003] The purpose of the utility model is to provide a power box assembly, which is used to solve the above technical problems.

[0004] The power box assembly is used for a range hood and includes a box body, a volute and a top cover; the box body has a receiving cavity with an opening facing upward, a first through hole is provided on the bottom plate of the receiving cavity, and an outlet is provided on one side side plate of the receiving cavity; the volute includes a surrounding plate and a lower cover plate, the lower cover plate is integrally formed with the surrounding plate, a first connecting portion is provided on the upper edge of the surrounding plate, and a second through hole is provided on the lower cover plate; the volute is installed in the receiving cavity, the lower cover plate is hermetically connected to the bottom plate of the receiving cavity, the second through hole is correspondingly arranged with the first through hole, and the size of the second through hole is smaller than that of the first through hole; the top cover is used to close the opening of the receiving cavity, the top cover is hermetically connected to the first connecting portion, the top cover and the volute enclose a turbine cavity, the turbine cavity is not in fluid communication with the receiving cavity, and the turbine cavity is in communication with the outside through the outlet.

[0005] According to an embodiment of the utility model, a first sealing member is provided between the top cover and the first connecting portion. After the top cover is connected to the first connecting portion, the first sealing member is extruded between the top cover and the first connecting portion and seals the gap between the top cover and the first connecting portion.

[0006] According to an embodiment of the utility model, the first connecting portion is formed by extending outward from the upper edge of the surrounding plate to the outside of the turbine cavity. A plurality of first blind holes are provided on the first connecting portion, and first connecting holes corresponding to the first blind holes are provided on the top cover. Screws sequentially pass through the first connecting holes and the first blind holes to connect the top cover and the first connecting portion.

[0007] According to an embodiment of the utility model, a first connecting column extends downward from the lower edge of the first connecting portion, and the first blind hole is provided on the first connecting column.

[0008] According to an embodiment of the utility model, second blind holes are provided on the lower cover plate, and second connecting holes corresponding to the second blind holes are provided on the bottom plate of the receiving cavity. Screws sequentially pass through the second connecting holes and the second blind holes to connect the lower cover plate and the bottom plate of the receiving cavity.

[0009] According to an embodiment of the present utility model, a second connecting column located in the turbine chamber is provided on the lower cover plate, and a second blind hole is provided on the second connecting column.

[0010] According to an embodiment of the present utility model, it further includes an air outlet joint. The air outlet joint is connected to the air outlet of the turbine chamber and extends out of the accommodating chamber through the outlet. The air outlet joint includes a lower pipe body and an upper pipe body. The lower pipe body is integrally formed with the volute. The upper pipe body and the lower pipe body are hermetically connected to the top cover, and an avoidance opening for avoiding the upper pipe body is provided on the top cover.

[0011] According to an embodiment of the present utility model, second connecting portions extend outward from both side edges of the lower pipe body, third connecting portions extend outward from both side edges of the upper pipe body, a second sealing member is provided between the second connecting portion and the third connecting portion, and the second connecting portion and the third connecting portion are connected and the second sealing member is squeezed therebetween; a fourth connecting portion extends from the front side edge of the upper pipe body, and the fourth connecting portion is hermetically connected to the top cover; a third sealing member is provided between the fourth connecting portion and the top cover, and the third sealing member is squeezed between the fourth connecting portion and the top cover.

[0012] According to an embodiment of the present utility model, a third connecting column is provided on the second connecting portion, a third blind hole is provided on the third connecting column, a third connecting hole corresponding to the third blind hole is provided on the third connecting portion, and screws sequentially pass through the third connecting hole and the third blind hole to connect the lower pipe body and the upper pipe body.

[0013] According to an embodiment of the present utility model, a fourth connecting column is provided on the fourth connecting portion, a fourth blind hole is provided on the fourth connecting column, a fourth connecting hole corresponding to the fourth blind hole is provided on the top cover, and screws sequentially pass through the fourth connecting hole and the fourth blind hole to connect the top cover and the upper pipe body.

[0014] Compared with the prior art, the power box assembly of the present utility model has the following advantages:

[0015] For the power box assembly of the present utility model, when it is applied to a range hood, a turbine assembly is installed in the turbine chamber of the power box assembly. Since the fluid is not communicated between the turbine chamber and the accommodating chamber, the oil fume entering the turbine chamber will not diffuse from the turbine chamber into the accommodating chamber, and the negative pressure formed by the turbine assembly in the turbine chamber will not weaken, which can ensure the smoke exhaust effect of the turbine assembly; and the top cover is hermetically connected to the first connecting portion, and the oil fume in the turbine chamber will not diffuse to the outside of the box body through the connection between the top cover and the first connecting portion, and the power box assembly will not leak smoke, which can ensure the negative pressure in the turbine chamber and ensure the smoke exhaust effect of the turbine assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic structural diagram of the power box assembly of the present utility model;

[0017] Figure 2 This is an exploded view of the structure of the power box assembly of the present utility model;

[0018] Figure 3 This is an exploded view of the structure of the power box assembly of the present utility model in another direction.

[0019] In the figure: 1. Box body; 11. Accommodating cavity; 111. First through hole; 112. Second connection hole; 12. Outlet; 2. Volute; 21. Enclosure; 211. First connection part; 212. First connection column; 2121. First blind hole; 22. Lower cover plate; 221. Second through hole; 222. Second blind hole; 223. Second connection column; 3. Top cover; 31. First connection hole; 32. Fourth connection hole; 33. Avoidance opening; 4. Air outlet joint; 41. Lower pipe body; 411. Second connection part; 4111. Third connection column; 4112. Third blind hole; 42. Upper pipe body; 421. Third connection part; 4211. Third connection hole; 422. Fourth connection part; 4221. Fourth connection column; 4222. Fourth blind hole.

[0020] The realization and advantages of the functions of the present utility model will be further described with reference to the embodiments and the accompanying drawings. Detailed implementation manners

[0021] The following will disclose multiple embodiments of the present utility model in the form of diagrams. For the sake of clarity, many practical details will be described together in the following narrative. However, it should be understood that these practical details are not used to limit the present utility model. That is to say, in some embodiments of the present utility model, these practical details are not necessary. In addition, for the purpose of simplifying the diagrams, some conventional structures and components will be shown in a simple schematic manner in the diagrams.

[0022] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present utility model are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If this specific posture changes, then the directional indications will also change accordingly.

[0023] In addition, in the present utility model, descriptions such as "first", "second", etc. are only for descriptive purposes, not specifically referring to the order or sequence, nor are they used to limit the present utility model. They are merely used to distinguish components or operations described with the same technical terms, and should not be understood as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or is unable to be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0024] To further understand the content, features and effects of the present utility model, the following embodiments are exemplified and described in detail with reference to the accompanying drawings as follows:

[0025] The present utility model discloses a power box assembly for a range hood. Please refer to Figures 1 to 3 , the power box assembly includes a box body 1, a volute 2 and a top cover 3; the box body 1 has a receiving cavity 11 with an opening facing upward. A first through hole 111 is provided on the bottom plate of the receiving cavity 11, and an outlet 12 is provided on one side side plate of the receiving cavity 11; the volute 2 includes a surrounding plate 21 and a lower cover plate 22. The lower cover plate 22 is integrally formed with the surrounding plate 21. A first connecting portion 211 is provided on the upper edge of the surrounding plate 21, and a second through hole 221 is provided on the lower cover plate 22; the volute 2 is installed in the receiving cavity 11, and the lower cover plate 22 is hermetically connected to the bottom plate of the receiving cavity 11. The second through hole 221 is correspondingly arranged with the first through hole 111, and the size of the second through hole 221 is smaller than the size of the first through hole 111; the top cover 3 is used to close the opening of the receiving cavity 11, and the top cover 3 is hermetically connected to the first connecting portion 211. The top cover 3 and the volute 2 enclose a turbine cavity. The turbine cavity is not in fluid communication with the receiving cavity 11, and the turbine cavity is in communication with the outside through the outlet 12.

[0026] The power box assembly of the present utility model, the lower cover plate 22 of the volute 2 is hermetically connected to the bottom plate of the accommodating cavity 11, and the top cover 3 is hermetically connected to the first connecting portion 211. When applied to a range hood, a turbine assembly is installed in the turbine cavity of the power box assembly. When the range hood operates, the turbine assembly operates, and cooking fumes enter the turbine cavity through the second through hole 221 on the lower cover plate 22 and are discharged from the turbine cavity through the outlet 112 communicating with the turbine cavity. Since the fluid is not communicated between the turbine cavity and the accommodating cavity 11, the cooking fumes entering the turbine cavity will not diffuse into the accommodating cavity 11 through the turbine cavity, and the negative pressure formed by the turbine assembly in the turbine cavity will not weaken, which can ensure the smoke exhaust effect of the turbine assembly; and the top cover 3 is hermetically connected to the first connecting portion 211, and the cooking fumes in the turbine cavity will not diffuse to the outside of the box body 1 through the connection between the top cover 3 and the first connecting portion 211, and the power box assembly will not leak smoke, which can ensure the negative pressure in the turbine cavity and ensure the smoke exhaust effect of the turbine assembly.

[0027] The power box assembly of the present utility model, when applied to a range hood, a turbine assembly is installed in the turbine cavity of the power box assembly. When the turbine assembly operates and sucks cooking fumes into the turbine cavity, the mixture of oil and water in the cooking fumes will be thrown onto the inner wall surface of the turbine cavity under the action of centrifugal force. When the turbine assembly stops operating, these mixtures of oil and water will flow downward along the inner wall surface of the turbine cavity to the lower cover plate 22, and then flow downward along the edge of the second through hole 221 on the lower cover plate 22, so that the size of the second through hole 221 on the lower cover plate 22 is smaller than the size of the first through hole 111, and the mixture of oil and water flowing downward along the edge of the second through hole 221 on the lower cover plate 22 will not enter the accommodating cavity 11 through the gap between the lower cover plate 22 and the bottom plate of the accommodating cavity 11.

[0028] The power box assembly of the present utility model, the volute 2 is an injection molded part, and the surrounding plate 21 and the lower cover plate 22 are integrally injection molded. Compared with the traditional welding process, the injection molding process is simple, and the connection between the lower edge of the surrounding plate 21 and the outer edge of the lower cover plate 22 has good sealing performance, improving the sealing performance of the volute 2 itself and preventing smoke leakage.

[0029] The power box assembly of the present utility model, a first sealing member is provided between the top cover 3 and the first connecting portion 211. After the top cover 3 is connected to the first connecting portion 211, the first sealing member is extruded between the top cover 3 and the first connecting portion 211 and seals the gap between the top cover 3 and the first connecting portion 211. The first sealing member can be sealing cotton or other sealing materials that can be deformed after being extruded. The first sealing member can fill and seal the gap between the top cover 3 and the first connecting portion 211, thereby improving the connection sealing effect between the top cover 3 and the volute 2.

[0030] The power box assembly of the present utility model, the volute 2 is an injection molded part, and the first connecting portion 211 at the upper edge of the surrounding plate 21 is also integrally injection molded with the volute 2. Please refer to Figure 2and Figure 3 The first connecting portion 211 is formed by extending from the upper edge of the shroud 21 to the outside of the turbine chamber. In this way, the area of the first connecting portion 211 can be increased to increase the connection area between the first connecting portion 211 and the top cover 3, improving the connection stability and connection sealing performance. A plurality of first blind holes 2121 are provided on the first connecting portion 211, and first connection holes 31 corresponding to the first blind holes 2121 are provided on the top cover 3. Screws sequentially pass through the first connection holes 31 and the first blind holes 2121 to connect the top cover 3 and the first connecting portion 211. The inner wall of the first blind hole 2121 is provided with internal threads, and after the screw passes through the first connection hole 31, it is threadedly engaged with the first blind hole 2121, which can simplify the fixing method of the screw and the first blind hole 2121. The first blind hole 2121 is not communicated with the accommodating cavity 11, so the turbine chamber and the accommodating cavity 11 will not have air flow communication through the first blind hole 2121. The head of the screw can seal the first connection hole 31, so the turbine chamber will not have air flow communication with the outside through the first connection hole 31. In this way, the sealing effect after the connection between the top cover 3 and the first connecting portion 211 can be ensured.

[0031] Please refer to Figure 2 and Figure 3 In the power box assembly of the present utility model, a first connecting column 212 extends downward from the lower edge of the first connecting portion 211, and the first blind hole 2121 is provided on the first connecting column 212. The first connecting column 212 can make the first blind hole 2121 have sufficient depth and width to improve the cooperation stability between the screw and the first blind hole 2121; by providing the first connecting column 212 for forming the first blind hole 2121, other parts of the first connecting portion 211 can be kept in a thin-walled shape, so that the structure of the volute 2 is simpler and lighter.

[0032] Please refer to Figure 2 In the power box assembly of the present utility model, second blind holes 222 are provided on the lower cover plate 22, and second connection holes 112 corresponding to the second blind holes 222 are provided on the bottom plate of the accommodating cavity 11. Screws sequentially pass through the second connection holes 112 and the second blind holes 222 to connect the lower cover plate 22 and the bottom plate of the accommodating cavity 11. The inner wall of the second blind hole 222 is provided with internal threads, and after the screw passes through the second connection hole 112, it is threadedly engaged with the second blind hole 222, which can simplify the fixing method of the screw and the second blind hole 222. The second blind hole 222 is not communicated with the accommodating cavity 11, so the turbine chamber and the accommodating cavity 11 will not have air flow communication through the second blind hole 222. The head of the screw can seal the second connection hole 112, so the turbine chamber will not have air flow communication with the outside through the second connection hole 112. In this way, the sealing effect after the connection between the lower cover plate 22 and the bottom plate of the accommodating cavity 11 can be ensured.

[0033] Please refer to Figure 2, for the power box assembly of the present utility model, the lower cover plate 22 is provided with a second connecting column 223 located in the turbine cavity, and a second blind hole 222 is provided on the second connecting column 223. The second connecting column 223 can make the second blind hole 222 have sufficient depth and width to improve the matching stability between the screw and the second blind hole 222; by providing the second connecting column 223 for the formation of the second blind hole 222, other parts of the lower cover plate 22 can be kept in a thin-walled shape, so that the structure of the volute 2 is simpler and lighter.

[0034] Please refer to Figure 2 and Figure 3 , for the power box assembly of the present utility model, the power box assembly further includes an air outlet joint 4. The air outlet joint 4 is connected to the air outlet of the turbine cavity and extends out of the accommodating cavity 11 through the outlet 12. The air outlet joint 4 includes a lower pipe body 41 and an upper pipe body 42. The lower pipe body 41 is integrally formed with the volute 2. The upper pipe body 42 and the lower pipe body 41 are hermetically connected to the top cover 3. The top cover 3 is provided with an avoidance opening 33 for avoiding the upper pipe body 42. The air outlet joint 4 can be used to connect with an external pipeline so that the air flow in the turbine cavity can flow to the external pipeline through the air outlet joint 4. Both the upper pipe body 42 and the lower pipe body 41 are made of plastic. Among them, the lower pipe body 41 is integrally injection-molded with the volute 2, which can simplify the connection method between the lower pipe body 41 and the volute 2 and improve the connection tightness. The upper pipe body 42 is separated from the lower pipe body 41 and the volute 2, which is convenient for demolding during injection molding. When assembling the power box assembly, the upper pipe body 42 and the lower pipe body 41 are hermetically spliced. When the top cover 3 is connected to the first connecting portion 211, it is also hermetically connected to the upper pipe body 42 to prevent air leakage at the connection between the upper pipe body 42 and the lower pipe body 41 and at the connection between the top cover 3 and the upper pipe body 42 and the lower pipe body 41.

[0035] According to an embodiment of the present utility model, please refer to Figure 2 and Figure 3 , on both sides of the lower pipe body 41, the edges extend outward to form a second connecting portion 411, on both sides of the upper pipe body 42, the edges extend outward to form a third connecting portion 421. A second sealing member is provided between the second connecting portion 411 and the third connecting portion 421. The second connecting portion 411 and the third connecting portion 421 are connected and the second sealing member is squeezed between the two; on the front side edge of the upper pipe body 42, a fourth connecting portion 422 extends. The fourth connecting portion 422 is hermetically connected to the top cover 3; a third sealing member is provided between the fourth connecting portion 422 and the top cover 3, and the third sealing member is squeezed between the fourth connecting portion 422 and the top cover 3.

[0036] The second seal and the third seal can be sealing cotton or other sealing materials that can be deformed after being extruded. The connection between the lower pipe body 41 and the upper pipe body 42 is realized through the connection between the second connection part 411 and the third connection part 421, which can increase the connection area between the lower pipe body 41 and the upper pipe body 42, so that there is enough area between the lower pipe body 41 and the upper pipe body 42 to set the second seal, thereby improving the connection sealing performance between the lower pipe body 41 and the upper pipe body 42. The fourth connection part 422 can increase the connection area between the upper pipe body 42 and the top cover 3, so that there is enough area between the upper pipe body 42 and the top cover 3 to set the third seal, thereby improving the connection sealing performance between the upper pipe body 42 and the top cover 3.

[0037] Please refer to Figure 2 and Figure 3 , for the power box assembly of the present utility model, a third connection post 4111 is provided on the second connection part 411, a third blind hole 4112 is provided on the third connection post 4111, and a third connection hole 4211 corresponding to the third blind hole 4112 is provided on the third connection part 421. Screws sequentially pass through the third connection hole 4211 and the third blind hole 4112 to connect the lower pipe body 41 and the upper pipe body 42.

[0038] Internal threads are provided on the pore wall of the third blind hole 4112. After the screw passes through the third connection hole 4211, it is in threaded cooperation with the third blind hole 4112, which can simplify the fixing method of the screw and the third blind hole 4112. The third blind hole 4112 is not communicated with the outside world. Therefore, the air outlet joint 4 and the outside world will not have air flow communication through the third blind hole 4112. The head of the screw can seal the third connection hole 4211. Therefore, the air outlet joint 4 will not have air flow communication with the outside through the third connection hole 4211. In this way, the sealing effect after the connection of the lower pipe body 41 and the upper pipe body 42 can be ensured.

[0039] The third connection post 4111 can make the third blind hole 4112 have sufficient depth and width to improve the cooperation stability between the screw and the third blind hole 4112; by providing the third connection post 4111 for the formation of the third blind hole 4112, other parts of the second connection part 411 can be kept in a thin-wall shape, so that the structure of the air outlet joint 4 is simpler and lighter.

[0040] , for the power box assembly of the present utility model, a fourth connection post 4221 is provided on the fourth connection part 422, a fourth blind hole 4222 is provided on the fourth connection post 4221, and a fourth connection hole 32 corresponding to the fourth blind hole 4222 is provided on the top cover 3. Screws sequentially pass through the fourth connection hole 32 and the fourth blind hole 4222 to connect the top cover 3 and the upper pipe body 42.

[0041] The inner wall of the fourth blind hole 4222 is provided with internal threads. After the screw passes through the fourth connection hole 32, it is in threaded cooperation with the fourth blind hole 4222, which can simplify the fixing method of the screw and the fourth blind hole 4222. The fourth blind hole 4222 is not communicated with the outside world. Therefore, the air outlet joint 4 and the accommodating cavity 11 will not have air flow communication through the fourth blind hole 4222. The head of the screw can seal the fourth connection hole 32. Therefore, the air outlet joint 4 will not have air flow communication with the outside through the fourth connection hole 32. In this way, the sealing effect after the top cover 3 and the upper pipe body 42 are connected can be ensured.

[0042] The fourth connection column 4221 can make the fourth blind hole 4222 have sufficient depth and width to improve the cooperation stability between the screw and the fourth blind hole 4222; by providing the fourth connection column 4221 for the formation of the fourth blind hole 4222, other parts of the fourth connection portion 422 can be kept in a thin-walled shape, so that the structure of the air outlet interface is simpler and lighter.

[0043] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, or improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A power box assembly for a range hood, characterized in that, Comprising: A box body (1) having a receiving cavity (11) with an opening facing upwards. A first through hole (111) is provided on the bottom plate of the receiving cavity (11), and an outlet (12) is provided on one side plate of the receiving cavity (11). A volute (2) including a surrounding plate (21) and a lower cover plate (22). The lower cover plate (22) is integrally formed with the surrounding plate (21). A first connecting portion (211) is provided at the upper edge of the surrounding plate (21), and a second through hole (221) is provided on the lower cover plate (22). The volute (2) is installed in the receiving cavity. The lower cover plate (22) is hermetically connected to the bottom plate of the receiving cavity. The second through hole (221) is correspondingly arranged with the first through hole (111), and the size of the second through hole (221) is smaller than the size of the first through hole (111). A top cover (3) for closing the opening of the receiving cavity. The top cover (3) is hermetically connected to the first connecting portion (211). The top cover and the volute (2) enclose a turbine cavity. The turbine cavity is not in fluid communication with the receiving cavity (11), and the turbine cavity communicates with the outside through the outlet (12).

2. The power box assembly according to claim 1, wherein A first sealing member is provided between the top cover (3) and the first connecting portion (211). After the top cover (3) is connected to the first connecting portion (211), the first sealing member is squeezed between the top cover (3) and the first connecting portion (211) to seal the gap between the top cover (3) and the first connecting portion (211).

3. The power box assembly according to claim 1, characterized in that, The first connecting portion (211) extends outward from the upper edge of the surrounding plate (21) towards the outside of the turbine cavity. A number of first blind holes (2121) are provided on the first connecting portion (211). First connecting holes (31) corresponding to the first blind holes (2121) are provided on the top cover (3). Screws sequentially pass through the first connecting holes (31) and the first blind holes (2121) to connect the top cover (3) to the first connecting portion (211).

4. The power box assembly according to claim 3, wherein, A first connecting column (212) extends downward from the lower edge of the first connecting portion (211), and the first blind hole (2121) is provided on the first connecting column (212).

5. The power box assembly according to claim 1, wherein Second blind holes (222) are provided on the lower cover plate (22), and second connecting holes (112) corresponding to the second blind holes (222) are provided on the bottom plate of the receiving cavity (11). Screws sequentially pass through the second connecting holes (112) and the second blind holes (222) to connect the lower cover plate (22) to the bottom plate of the receiving cavity (11).

6. The power box assembly according to claim 5, characterized in that, A second connecting column (223) located in the turbine cavity is provided on the lower cover plate (22), and the second blind hole (222) is provided on the second connecting column (223).

7. The power box assembly according to claim 1, characterized in that, It further includes an air outlet joint (4), the air outlet joint (4) is connected to the air outlet of the turbine chamber and extends out of the accommodating chamber (11) through the outlet (12). The air outlet joint (4) includes a lower pipe body (41) and an upper pipe body (42). The lower pipe body (41) is integrally formed with the volute (2). The upper pipe body (42) and the lower pipe body (41) are sealingly connected to the top cover (3). A relief opening (33) for the upper pipe body (42) is provided on the top cover (3).

8. The power box assembly according to claim 7, characterized in that, Second connecting portions (411) extend outward from both side edges of the lower pipe body (41). Third connecting portions (421) extend outward from both side edges of the upper pipe body (42). A second sealing member is provided between the second connecting portions (411) and the third connecting portions (421). The second connecting portions (411) and the third connecting portions (421) are connected and the second sealing member is squeezed therebetween. A fourth connecting portion (422) extends from the front side edge of the upper pipe body (42). The fourth connecting portion (422) is sealingly connected to the top cover (3). A third sealing member is provided between the fourth connecting portion (422) and the top cover (3). The third sealing member is squeezed between the fourth connecting portion (422) and the top cover (3).

9. The power box assembly according to claim 8, characterized in that, Third connecting posts (4111) are provided on the second connecting portions (411). Third blind holes (4112) are provided on the third connecting posts (4111). Third connecting holes (4211) corresponding to the third blind holes (4112) are provided on the third connecting portions (421). Screws sequentially pass through the third connecting holes (4211) and the third blind holes (4112) to connect the lower pipe body (41) and the upper pipe body (42).

10. The power box assembly according to claim 8, characterized in that, Fourth connecting posts (4221) are provided on the fourth connecting portions (422). Fourth blind holes (4222) are provided on the fourth connecting posts (4221). Fourth connecting holes (32) corresponding to the fourth blind holes (4222) are provided on the top cover (3). Screws sequentially pass through the fourth connecting holes (32) and the fourth blind holes (4222) to connect the top cover (3) and the upper pipe body (42).

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