Negative pressure box fan assembly

Abstract

The utility model belongs to the technical field of integrated cookers, and discloses a negative pressure box fan assembly, which comprises a box body, an air outlet seat and a fan, the box body is provided with an air inlet hole and an air outlet hole, the air inlet hole is communicated with a smoke suction port on a machine head of an integrated cooker, a first sealing ring is arranged at the air outlet hole, and a second sealing ring is arranged at the air outlet hole. The periphery of the hole wall of the air outlet hole is wrapped with the first sealing ring, the first sealing ring comprises a first sealing part and a second sealing part which are integrally formed, the first sealing part and the second sealing part are located on the inner side and the outer side of the box body respectively, and the first sealing part is limited between the part, located on the periphery of the air outlet, of the fan and the box body in an abutting mode; and the second sealing part is pressed and limited between the box body and the air outlet seat. According to the utility model, double sealing can be realized, and meanwhile, the hole wall of the air outlet hole can be sealed, so that the sealing effect at the air outlet hole of the box body can be improved, oil smoke leakage can be effectively avoided, and the use experience of a user is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of integrated stoves, in particular to a negative pressure box fan assembly. Background Art

[0002] An integrated stove, also known as an environmental protection stove or an integrated environmental protection stove, is a kitchen appliance that integrates multiple functions such as a smoke extractor, a gas stove, a disinfection cabinet, and a storage cabinet. It has the advantages of saving space, good smoke extraction effect, energy saving, low consumption, and environmental protection.

[0003] Among them, the smoke extractor is used to extract the cooking fumes during the cooking process, so as to avoid affecting the health of users and reduce the cooking fumes adhering to the kitchen utensils and kitchen walls. At present, the smoke extractor generally includes a negative pressure box fan assembly, which is used to quickly extract the cooking fumes and discharge them outdoors during the cooking process. Specifically, the negative pressure box fan assembly in the prior art generally includes a box body, a fan, and an air outlet seat. Among them, the box body is provided with an air inlet hole and an air outlet hole. The air inlet hole is communicated with the smoke suction port on the integrated stove head, the air outlet hole is communicated with the air outlet seat, and one end of the air outlet seat far away from the air outlet hole is communicated with the outside. The fan is installed in the box body, and the air inlet and exhaust ports of the fan are respectively communicated with the air inlet hole and the air outlet hole. In the prior art, at the air outlet hole of the box body, the sealing effect between the fan and the box body and between the air outlet seat and the box body is poor, so that the cooking fumes are likely to leak from the air outlet hole, thereby affecting the user experience.

[0004] Therefore, the above problems need to be solved urgently. Content of the Utility Model

[0005] The purpose of the utility model is to provide a negative pressure box fan assembly to improve the sealing effect at the air outlet hole of the box body, so as to effectively avoid the leakage of cooking fumes and improve the user experience.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] The negative pressure box fan assembly includes a box body, an air outlet seat, and a fan. The box body is provided with an air inlet hole and an air outlet hole. The air outlet seat is fixedly connected to the box body and communicated with the air outlet hole. The fan is installed in the box body. The air inlet and exhaust ports of the fan are respectively communicated with the air inlet hole and the air outlet hole. A first sealing ring is arranged at the air outlet hole. The first sealing ring covers the outer periphery of the hole wall of the air outlet hole. The first sealing ring includes an integrally formed first sealing part and a second sealing part. The first sealing part and the second sealing part are respectively located inside and outside the box body. The first sealing part is pressed and limited between the part of the fan located outside the exhaust port and the box body. The second sealing part is pressed and limited between the box body and the air outlet seat.

[0008] Preferably, the negative pressure box fan assembly further includes an air inlet flange, a second sealing ring, and a third sealing ring. The air inlet flange is fixedly connected to the box body. The two ends of the air inlet flange are respectively communicated with the ventilation pipe and the air inlet hole. The second sealing ring and the third sealing ring are both embedded in the air inlet flange. The second sealing ring is pressed and limited between the ventilation pipe and the air inlet flange, and the third sealing ring is pressed and limited between the air inlet flange and the box body.

[0009] Preferably, a first ring rib is provided on one side of the third sealing ring facing the box body, and the first ring rib surrounds the outer periphery of the air inlet hole.

[0010] Preferably, a second ring rib is provided on one side of the first sealing portion facing the fan, and the second ring rib surrounds the outer periphery of the air outlet hole.

[0011] Preferably, a third ring rib is provided on one side of the second sealing portion away from the box body along the opening direction of the air outlet hole, and the third ring rib surrounds the outer periphery of the air outlet hole.

[0012] Preferably, the hole wall of the air outlet hole is turned outward to form a flange, and the flange is embedded in the second sealing portion.

[0013] Preferably, the box body includes a surrounding plate, and the surrounding plate includes a first plate portion, a second plate portion, and a third plate portion. The first plate portion and the second plate portion are arranged opposite to each other in a first direction, and the third plate portion is installed between the first plate portion and the second plate portion. A first cover plate is detachably installed on one side of the surrounding plate along a second direction perpendicular to the first direction. The first cover plate and the surrounding plate enclose an installation cavity, and the fan is installed in the installation cavity. A fourth sealing ring is pressed and limited between the first cover plate and the surrounding plate.

[0014] Preferably, the air inlet hole is provided on one side of the surrounding plate along the first direction. A second cover plate is installed on the other side of the surrounding plate along the second direction. The first cover plate and the second cover plate are arranged opposite to each other. Air inlets are provided on both sides of the fan along the second direction. A first boss is provided on one side of the first cover plate facing the second cover plate. The first boss is arranged around the axis of the air inlet and is located on the side of the air inlet away from the air inlet hole along the first direction. A second boss is provided on one side of the second cover plate facing the first cover plate. The second boss is arranged around the axis of the air inlet and is located on the side of the air inlet away from the air inlet hole along the first direction.

[0015] Preferably, a funnel is installed at the bottom of the surrounding plate.

[0016] Preferably, an exhaust pipe is provided at one end of the air outlet base away from the box body. The exhaust pipe is inserted into and communicated with the air outlet base, and a fifth sealing ring is defined by pressing between the exhaust pipe and the air outlet base. The fifth sealing ring is coaxially arranged with the air outlet base and the exhaust pipe.

[0017] Advantages of the present utility model: In the present utility model, it is possible to seal both the position inside the box body around the air outlet hole and the position outside the box body around the air outlet hole, thereby achieving double sealing. At the same time, while the first sealing ring seals the position inside the box body around the air outlet hole and the position outside the box body around the air outlet hole, it can also seal the hole wall of the air outlet hole, thereby improving the sealing effect at the air outlet hole of the box body, effectively avoiding oil fume leakage, and improving the user experience. Description of the Drawings

[0018] Figure 1 is a schematic structural diagram of the negative pressure box fan assembly in an embodiment of the present utility model;

[0019] Figure 2 is an exploded view of the negative pressure box fan assembly in an embodiment of the present utility model;

[0020] Figure 3 is a cross-sectional view of the negative pressure box fan assembly along the longitudinal section perpendicular to the axes of the exhaust pipe and the air inlet in an embodiment of the present utility model;

[0021] Figure 4 is Figure 3 a partial enlarged view of A in

[0022] Figure 5 is Figure 3 a partial enlarged view of B in

[0023] Figure 6 is Figure 3 a partial enlarged view of C in

[0024] Figure 7 is a cross-sectional view of the negative pressure box fan assembly along the longitudinal section parallel to the axes of the exhaust pipe and the air inlet in an embodiment of the present utility model.

[0025] In the figure:

[0026] 1. Box body; 11. Air inlet hole; 12. Air outlet hole; 13. Flange; 14. Enclosure; 141. First plate part; 142. Second plate part; 143. Third plate part; 15. First cover plate; 151. First boss; 16. Second cover plate; 161. Second boss; 17. Funnel;

[0027] 2. Air outlet base; 21. Fifth sealing ring; 22. Ring groove;

[0028] 3. Fan; 31. Air inlet; 32. Exhaust port;

[0029] 4. First sealing ring; 41. First sealing part; 411. Second annular rib; 42. Second sealing part; 421. Third annular rib;

[0030] 5. Air inlet flange; 6. Second sealing ring; 7. Third sealing ring; 71. First annular rib;

[0031] 8. Ventilation pipe; 9. Exhaust pipe. Detailed implementation mode

[0032] The present utility model will be further described in detail below in conjunction with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. In addition, it should be noted that for the sake of description, only parts related to the present utility model rather than all structures are shown in the drawings.

[0033] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected", and "fixed" shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0034] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include that the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "above", and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "below", "below", and "under" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0035] In the description of this embodiment, the orientation or positional relationship terms such as "above", "below", "left", and "right" are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0036] Please refer to Figures 1 to 7 , in this embodiment, a negative pressure box fan assembly is provided. The negative pressure box fan assembly, as a part of the integrated stove, is used to extract and discharge cooking fumes outdoors during the cooking process. It should be noted that the negative pressure box fan assembly in this embodiment is installed outside the integrated stove main body, so as to be far away from the cooking range of the integrated stove, thereby avoiding the noise generated by the negative pressure box fan assembly from affecting the user experience. Of course, in other alternative embodiments, the negative pressure box fan assembly can also be integrated into the integrated stove main body, and this embodiment does not make specific restrictions on this.

[0037] The negative pressure box fan assembly includes a box body 1, an air outlet seat 2 and a fan 3. The box body 1 is provided with an air inlet hole 11 and an air outlet hole 12. The air inlet hole 11 is communicated with the smoke suction port on the integrated stove head. Among them, the integrated stove head is installed on the integrated stove main body and is located above the cooking range. The fan 3 is installed in the box body 1. The air inlet 31 and the exhaust outlet 32 of the fan 3 are respectively communicated with the air inlet hole 11 and the air outlet hole 12. During the cooking process, the fan 3 can suck the cooking fumes through the smoke suction port. The air outlet seat 2 is fixedly connected to the box body 1 and is communicated with the air outlet hole 12. The fan 3 can discharge the cooking fumes to the air outlet seat 2 and discharge them outdoors through the air outlet seat 2.

[0038] In this embodiment, the box body 1 includes a surrounding plate 14. The surrounding plate 14 includes a first plate portion 141, a second plate portion 142 and a third plate portion 143. The first plate portion 141 and the second plate portion 142 are arranged opposite to each other in the first direction. The third plate portion 143 is installed between the first plate portion 141 and the second plate portion 142. The air inlet hole 11 is provided on one side of the surrounding plate 14 in the first direction. Specifically, the air inlet hole 11 is opened on the first plate portion 141, and the air outlet hole 12 is opened on the second plate portion 142. A first cover plate 15 is installed on one side of the surrounding plate 14 in the second direction, and a second cover plate 16 is installed on the other side of the surrounding plate 14 in the second direction. The first cover plate 15 and the second cover plate 16 are arranged opposite to each other. The fan 3 is installed between the surrounding plate 14, the first cover plate 15 and the second cover plate 16.

[0039] Preferably, a first sealing ring 4 is provided at the air outlet hole 12. The first sealing ring 4 is wrapped around the outer periphery of the hole wall of the air outlet hole 12. The first sealing ring 4 includes an integrally formed first sealing portion 41 and a second sealing portion 42. The first sealing portion 41 and the second sealing portion 42 are respectively located inside and outside the box body 1. The first sealing portion 41 is pressed and defined between the position on the fan 3 located outside the exhaust port 32 and the box body 1, so as to seal the position inside the box body 1 located outside the air outlet hole 12. The second sealing portion 42 is pressed and defined between the box body 1 and the air outlet seat 2, so as to seal the position outside the box body 1 located outside the air outlet hole 12. Moreover, since the first sealing portion 41 and the second sealing portion 42 are integrally formed and wrapped around the outer periphery of the hole wall of the air outlet hole 12, therefore, the first sealing ring 4 can also seal the hole wall of the air outlet hole 12, thereby improving the sealing effect at the air outlet hole 12 of the box body 1.

[0040] Based on the above, in this embodiment, it can not only seal the position inside the box body 1 located outside the air outlet hole 12, but also seal the position outside the box body 1 located outside the air outlet hole 12, so as to achieve double sealing. At the same time, while the first sealing ring 4 seals the position inside the box body 1 located outside the air outlet hole 12 and the position outside the box body 1 located outside the air outlet hole 12, it can also seal the hole wall of the air outlet hole 12, thereby improving the sealing effect at the air outlet hole 12 of the box body 1, and further effectively avoiding oil fume leakage, and further improving the user experience.

[0041] In addition, in this embodiment, the hole wall of the air outlet hole 12 is turned outward toward the outside of the box body 1 to form a flanging 13. The flanging 13 is embedded in the second sealing portion 42, so as to fix the first sealing ring 4 on the box body 1. Moreover, since the second sealing portion 42 is wrapped around the outer periphery of the flanging 13, therefore, this embodiment can further improve the sealing effect of the position outside the box body 1 located outside the air outlet hole 12, and further improve the sealing effect at the air outlet hole 12 of the box body 1, thereby further effectively avoiding oil fume leakage, and further improving the user experience.

[0042] It should be noted that, in this embodiment, a ring groove 22 is provided at one end of the air outlet seat 2. When installing the air outlet seat 2, the air outlet seat 2 can be sleeved on the outer periphery of the second sealing portion 42 through the ring groove 22, so as to buckle the air outlet seat 2 on the box body 1. In addition, the air outlet seat 2 buckled on the box body 1 is fixedly connected to the box body 1 by bolts.

[0043] Based on the content mentioned above, in this embodiment, a first cover plate 15 is installed on one side of the enclosing plate 14 along the second direction. Specifically, the connection method of the first cover plate 15 is a detachable connection. In other words, a first cover plate 15 is detachably installed on one side of the enclosing plate 14 along the second direction perpendicular to the first direction. The first cover plate 15 and the enclosing plate 14 enclose an installation cavity, and the fan 3 is installed in the installation cavity, thus facilitating the maintenance of the fan 3.

[0044] It can be understood that the connection between the first cover plate 15 and the cover plate can be any one of detachable connection methods such as bolt connection, pin connection, and snap connection. No specific limitation is made in this embodiment.

[0045] It should be noted that in this embodiment, the fan 3 is a centrifugal fan. The fan 3 is installed between the enclosing plate 14, the first cover plate 15, and the second cover plate 16. Air inlets 31 are provided on both sides of the fan 3 along the second direction. During the cooking process, the cooking fumes can enter the box body 1 through the air inlet holes 11 and flow to both sides of the fan 3 along the second direction, and then enter the fan 3 through the two air inlets 31 respectively. The cooking fumes entering the fan 3 can flow towards the exhaust port 32 and be discharged outdoors through the air outlet seat 2.

[0046] Preferably, a first boss 151 is provided on the side of the first cover plate 15 facing the second cover plate 16. The first boss 151 is arranged around the axis of the air inlet 31 and is located on the side of the air inlet 31 away from the air inlet hole 11 along the first direction. The first boss 151 can gather the cooking fumes flowing between the first cover plate 15 and the fan 3 to the air inlet 31 near the first cover plate 15, so that the fan 3 can quickly extract the cooking fumes, and further quickly discharge the cooking fumes above the cooking range outdoors during the cooking process, thereby further improving the user experience.

[0047] Correspondingly, a second boss 161 is provided on the side of the second cover plate 16 facing the first cover plate 15. The second boss 161 is arranged around the axis of the air inlet 31 and is located on the side of the air inlet 31 away from the air inlet hole 11 along the first direction. The second boss 161 can gather the cooking fumes flowing between the second cover plate 16 and the fan 3 to the air inlet 31 near the second cover plate 16, so that the fan 3 can extract the cooking fumes more quickly, and further quickly discharge the cooking fumes above the cooking range outdoors during the cooking process, thereby further improving the user experience.

[0048] Furthermore, the negative pressure box fan assembly further includes an intake flange 5, a second sealing ring 6, and a third sealing ring 7. The intake flange 5 is fixedly connected to the box body 1. The two ends of the intake flange 5 are respectively communicated with a ventilation pipe 8 and an air inlet hole 11. The ventilation pipe 8 is communicated with the smoke suction port on the integrated cooking stove head. During the cooking process, the cooking fumes can flow along the ventilation pipe 8 and enter the box body 1 through the air inlet hole 11. Among them, the second sealing ring 6 and the third sealing ring 7 are both embedded in the intake flange 5. The second sealing ring 6 is pressed and limited between the ventilation pipe 8 and the intake flange 5, so as to seal the connection between the ventilation pipe 8 and the intake flange 5, thereby preventing the cooking fumes from leaking from the connection between the ventilation pipe 8 and the intake flange 5. The third sealing ring 7 is pressed and limited between the intake flange 5 and the box body 1, so as to seal the position on the outer side of the box body 1 around the air inlet hole 11, thereby preventing the cooking fumes from leaking from the air inlet hole 11. Based on the above, this embodiment can further effectively prevent the cooking fumes from leaking, and thus further improve the user experience.

[0049] It should be noted that a first ring rib 71 is provided on the side of the third sealing ring 7 facing the box body 1. The first ring rib 71 surrounds the outer periphery of the air inlet hole 11, thereby further improving the sealing effect at the air inlet hole 11.

[0050] It should be noted that in this embodiment, at least two first ring ribs 71 are provided on the side of the third sealing ring 7 facing the box body 1, thereby further improving the sealing effect at the air inlet hole 11.

[0051] In addition, a second ring rib 411 is provided on the side of the first sealing portion 41 facing the fan 3. The second ring rib 411 surrounds the outer periphery of the air outlet hole 12, thereby improving the sealing effect on the inner side of the box body 1 at the position around the air outlet hole 12.

[0052] It should be noted that in this embodiment, at least two second ring ribs 411 are provided on the side of the first sealing portion 41 facing the fan 3, thereby further improving the sealing effect on the inner side of the box body 1 at the position around the air outlet hole 12.

[0053] Furthermore, a third ring rib 421 is provided on the side of the second sealing portion 42 away from the box body 1 along the opening direction of the air outlet hole 12. The third ring rib 421 surrounds the outer periphery of the air outlet hole 12, thereby improving the sealing effect on the outer side of the box body 1 at the position around the air outlet hole 12.

[0054] It should be noted that in this embodiment, at least two third ring ribs 421 are provided on the side of the second sealing portion 42 away from the box body 1 along the opening direction of the air outlet hole 12, thereby further improving the sealing effect on the outer side of the box body 1 at the position around the air outlet hole 12.

[0055] Based on the content mentioned above, a first cover plate 15 is detachably installed on one side of the apron 14 along a second direction perpendicular to the first direction. Further, a fourth sealing ring (not shown in the figure) is defined by pressing between the first cover plate 15 and the apron 14, so as to ensure the sealing effect between the first cover plate 15 and the apron 14, and further effectively avoid oil fume leakage.

[0056] In addition, a funnel 17 is installed at the bottom of the apron 14, and an oil receiving box (not shown in the figure) is installed below the funnel 17, so as to collect the oil liquid attached to the inside of the fan 3 during the oil fume exhaust process.

[0057] Further, an exhaust pipe 9 is provided at one end of the air outlet seat 2 away from the box body 1. The exhaust pipe 9 is inserted and communicated with the air outlet seat 2, and the exhaust pipe 9 is communicated with the outside, so as to discharge the oil fume outdoors. A fifth sealing ring 21 is defined by pressing between the exhaust pipe 9 and the air outlet seat 2. The fifth sealing ring 21 is coaxially arranged with the air outlet seat 2 and the exhaust pipe 9. The fifth sealing ring 21 can seal the connection between the exhaust pipe 9 and the air outlet seat 2, so as to further effectively avoid oil fume leakage and further improve the user experience.

[0058] Exemplarily, in this embodiment, the exhaust pipe 9 is inserted into the air outlet seat 2, and the fifth sealing ring 21 is embedded in the air outlet seat 2 and is defined by pressing between the end wall of the exhaust pipe 9 and the air outlet seat 2. Of course, in other optional embodiments, the air outlet seat 2 may also be inserted into the exhaust pipe 9. Correspondingly, the fifth sealing ring 21 is embedded in the exhaust pipe 9 and is defined by pressing between the end wall of the air outlet seat 2 and the exhaust pipe 9. This embodiment does not make specific restrictions on this.

[0059] In addition, it should be noted that, in this embodiment, the exhaust pipe 9 and the air outlet seat 2 are inserted together by screwing. Of course, in other optional embodiments, the exhaust pipe 9 and the air outlet seat 2 may also be connected by other insertion methods such as key connection. This embodiment does not make specific restrictions on this.

[0060] Obviously, the above embodiments of the present invention are only examples for clearly explaining the present invention, and are not limitations on the implementation manners of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. The negative pressure box fan assembly includes a box body (1), an air outlet seat (2) and a fan (3). The box body (1) is provided with an air inlet hole (11) and an air outlet hole (12). The air outlet seat (2) is fixedly connected to the box body (1) and communicates with the air outlet hole (12). The fan (3) is installed in the box body (1). The air inlet (31) and the air outlet (32) of the fan (3) are respectively communicated with the air inlet hole (11) and the air outlet hole (12). It is characterized in that, A first sealing ring (4) is provided at the air outlet hole (12). The first sealing ring (4) covers the outer periphery of the hole wall of the air outlet hole (12). The first sealing ring (4) includes an integrally formed first sealing portion (41) and a second sealing portion (42). The first sealing portion (41) and the second sealing portion (42) are respectively located inside and outside the box body (1). The first sealing portion (41) is pressed and limited between the part of the fan (3) located outside the exhaust port (32) and the box body (1). The second sealing portion (42) is pressed and limited between the box body (1) and the air outlet seat (2).

2. The negative pressure box fan assembly according to claim 1, characterized in that, The negative pressure box fan assembly further includes an air inlet flange (5), a second sealing ring (6) and a third sealing ring (7). The air inlet flange (5) is fixedly connected to the box body (1). The two ends of the air inlet flange (5) are respectively communicated with a ventilation pipe (8) and the air inlet hole (11). The second sealing ring (6) and the third sealing ring (7) are both embedded on the air inlet flange (5). The second sealing ring (6) is pressed and limited between the ventilation pipe (8) and the air inlet flange (5). The third sealing ring (7) is pressed and limited between the air inlet flange (5) and the box body (1).

3. The negative pressure box fan assembly according to claim 2, wherein A first ring rib (71) is provided on one side of the third sealing ring (7) facing the box body (1). The first ring rib (71) surrounds the outer periphery of the air inlet hole (11).

4. The negative pressure box fan assembly according to claim 1, wherein A second ring rib (411) is provided on one side of the first sealing portion (41) facing the fan (3). The second ring rib (411) surrounds the outer periphery of the air outlet hole (12).

5. The negative pressure box fan assembly according to claim 1, wherein, A third ring rib (421) is provided on the side of the second sealing portion (42) away from the box body (1) along the opening direction of the air outlet hole (12). The third ring rib (421) surrounds the outer periphery of the air outlet hole (12).

6. The negative pressure box fan assembly according to claim 1, wherein, The hole wall of the air outlet hole (12) is turned over towards the outside of the box body (1) to form a flange (13). The flange (13) is embedded in the second sealing portion (42).

7. The negative pressure box fan assembly according to claim 1, characterized in that, The box body (1) includes a surrounding plate (14). The surrounding plate (14) includes a first plate portion (141), a second plate portion (142) and a third plate portion (143). The first plate portion (141) and the second plate portion (142) are arranged opposite to each other in a first direction. The third plate portion (143) is installed between the first plate portion (141) and the second plate portion (142). A first cover plate (15) is detachably installed on one side of the surrounding plate (14) along a second direction perpendicular to the first direction. The first cover plate (15) and the surrounding plate (14) enclose an installation cavity. The fan (3) is installed in the installation cavity. A fourth sealing ring is pressed and limited between the first cover plate (15) and the surrounding plate (14).

8. The negative pressure box fan assembly according to claim 7, characterized in that The air inlet hole (11) is arranged on one side of the shroud (14) along the first direction, and a second cover plate (16) is installed on the other side of the shroud (14) along the second direction. The first cover plate (15) and the second cover plate (16) are arranged opposite to each other. Air inlets (31) are arranged on both sides of the blower (3) along the second direction. A first boss (151) is arranged on the side of the first cover plate (15) facing the second cover plate (16). The first boss (151) is arranged around the axis of the air inlet (31) and is located on the side of the air inlet (31) away from the air inlet hole (11) along the first direction. A second boss (161) is arranged on the side of the second cover plate (16) facing the first cover plate (15). The second boss (161) is arranged around the axis of the air inlet (31) and is located on the side of the air inlet (31) away from the air inlet hole (11) along the first direction.

9. The negative pressure box fan assembly according to claim 7, characterized in that, A funnel (17) is installed at the bottom of the shroud (14).

10. The negative pressure box fan assembly according to claim 1, characterized in that, An exhaust pipe (9) is arranged at one end of the air outlet seat (2) away from the box body (1). The exhaust pipe (9) is inserted and communicated with the air outlet seat (2), and a fifth sealing ring (21) is defined by pressing between the exhaust pipe (9) and the air outlet seat (2). The fifth sealing ring (21) is coaxially arranged with the air outlet seat (2) and the exhaust pipe (9).

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