Fresh air chamber indoor exhaust cover body with flow guide port

Abstract

The utility model relates to the field of fresh air indoor exhaust technology discloses fresh air indoor exhaust cover body with guide port, including the outer cover, the inside of outer cover is provided with adjusting mechanism, the inside bottom of outer cover is provided with the cavity that sets up, the inside of cavity is provided with locking mechanism, the adjusting mechanism includes the mounting bracket, the outer wall periphery of mounting bracket is connected with the inner wall sliding of outer cover, the inside left and right end of mounting bracket all sets up a plurality of variable distance sliding slot, the inside of mounting bracket is provided with a plurality of guide plate, a plurality of left and right sides middle lower part of guide plate all are fixedly connected with connecting pin no.

Description

Technical Field

[0001] This utility model relates to the field of fresh air indoor exhaust technology, and in particular to a fresh air indoor exhaust hood with a guide port. Background Technology

[0002] The exhaust hood in a fresh air system is a key component, mainly used to collect and exhaust polluted indoor air to maintain good indoor air quality. Through a reasonable airflow design, pollutants are efficiently captured and discharged outdoors through ducts. The exhaust hood generates negative pressure through the operation of a built-in fan, which draws in polluted indoor air from the hood's air inlet. The fan speed determines the intensity of the negative pressure, which in turn affects the exhaust efficiency.

[0003] The air inlet of the fresh air indoor exhaust hood is a straight opening, which will create turbulence when the air is drawn in, resulting in high exhaust resistance and failing to meet the needs of complex scenarios. Therefore, a fresh air indoor exhaust hood with a guide port is needed to guide the direction of the drawn-in air, equalize its speed, and suppress noise, thereby improving exhaust efficiency and reducing energy consumption.

[0004] Early indoor exhaust hoods were box-like structures, consisting of a fixed hood, a straight air inlet, and a built-in fan. The fixed hood defined the air collection area, the straight air inlet served only as the airflow inlet, and the fan provided the exhaust power. The lack of a guiding structure led to turbulent airflow, creating vortices inside the hood, resulting in low exhaust efficiency and noise pollution. To address these issues, existing technologies added fixed guide vanes to the air inlet, using the angle design of the guide structure to direct airflow, reduce vortex losses, and increase exhaust speed. However, in practical use, the lack of flexibility in adjusting the guide structure meant that the fixed vanes could not dynamically adjust the guiding range according to real-time pollution concentration, resulting in insufficient exhaust capacity and failing to meet user needs. Utility Model Content

[0005] To overcome the above shortcomings, this utility model provides a fresh air indoor exhaust hood with a guide port, which aims to improve the problem that the fixed blades in the prior art cannot dynamically adjust the guide range according to the real-time pollution concentration.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a fresh air indoor exhaust hood with a guide port, including an outer cover, an adjustment mechanism provided on the inner side of the outer cover, a cavity opened at the bottom of the inner side of the outer cover, and a locking mechanism provided inside the cavity;

[0007] The adjustment mechanism includes a mounting frame, the outer wall of which is slidably connected to the inner wall of the outer cover. Multiple pitch-changing grooves are provided on the left and right sides of the inner side of the mounting frame. Multiple guide plates are provided on the inner side of the mounting frame. Connecting pin 1 is fixedly connected to the lower middle part of the left and right sides of each of the multiple guide plates. Connecting pin 2 is rotatably connected to the upper middle part of the left and right sides of each of the multiple guide plates. The outer walls of the multiple connecting pins 1 and 2 are slidably connected to the inner side of the corresponding pitch-changing grooves. Cavities are provided on the left and right sides of the interior of the mounting frame. Connecting rods are slidably connected to the upper middle part of the inner walls of the two cavities. One end of each of the multiple connecting pins 2 is fixedly connected to one side of the corresponding connecting rod. Pitch-changing components are provided at the bottom of each of the two connecting rods.

[0008] As a further description of the above technical solution:

[0009] The locking mechanism includes multiple connecting posts and transmission belts. The tops of the multiple connecting posts are rotatably connected to the four corners of the bottom of the outer cover. A locking block is fixedly connected to one side of the outer wall of each of the multiple connecting posts. The tops of the multiple connecting posts penetrate the bottom of the outer cover. Gears are fixedly connected to the middle of the outer wall of the two front connecting posts. Racks are slidably connected to the left and right ends of the front side of the inner wall of the cavity. The two racks are respectively meshed with the corresponding gears. A sliding groove is opened on the front bottom of the cavity. Connecting plates are fixedly connected to the adjacent sides of the two racks. The front and rear sides of the two connecting plates are slidably connected to the inner wall of the sliding groove. The tops of the outer walls of the multiple connecting posts are respectively driven by corresponding transmission belts.

[0010] As a further description of the above technical solution:

[0011] The pitch-changing assembly includes two pull rods. The top ends of the two pull rods are fixedly connected to the bottom of the corresponding connecting rods. The bottom ends of the two pull rods penetrate the bottom of the inner wall of the cavity and are fixedly connected to a pull ring. Multiple positioning grooves are provided on the front and rear sides of the outer walls of the two pull rods. Springs are provided on the front and rear sides of the outer walls of the two pull rods. Ball bearings are fixedly connected to adjacent sides of the two springs. The rear ends of the two springs are fixedly connected to one side of the inner wall of the cavity.

[0012] As a further description of the above technical solution:

[0013] The inner wall of the outer cover has limit grooves on both the left and right sides, and the left and right sides of the mounting bracket are slidably connected to the inner wall of the corresponding limit groove.

[0014] As a further description of the above technical solution:

[0015] A boss is fixedly connected to the upper part of the inner wall of the mounting bracket. A filter screen is provided on the top of the boss. A knob is rotatably connected at each of the four corners of the top of the mounting bracket. A baffle is fixedly connected to the bottom of the outer wall of each of the knobs.

[0016] As a further description of the above technical solution:

[0017] Both sides of the outer cover are provided with retaining springs, and the other side of each retaining spring is fixedly connected with a retaining plate.

[0018] As a further description of the above technical solution:

[0019] Both of the retaining rings have a limiting post on their inner side, and a positioning rod is fixedly connected to the adjacent side of the outer wall of each of the two limiting posts. Multiple positioning holes are opened on the left and right sides of the outer cover, and the two positioning rods are respectively engaged with the corresponding positioning holes.

[0020] As a further description of the above technical solution:

[0021] The outer dimensions of the filter screen match the inner dimensions of the mounting bracket, and multiple raised ridges are provided on the front and rear sides of the multiple guide plates.

[0022] This utility model has the following beneficial effects:

[0023] 1. In this utility model, pulling the pull rod causes the connecting rod to move downwards. The connecting rod, through the second connecting pin, causes the guide plate to move downwards. Multiple guide plates are moved and tilted in one direction by the sliding action of the first connecting pin and the second connecting pin in the variable pitch groove. This allows the exhaust hood to dynamically adjust the guiding range through the tilting action of the guide plate, increase the effective area, and improve the exhaust capacity. Multiple positioning slots on both sides of the pull rod allow for adjustment of the tilt angle of the guide plate at multiple levels to adapt to different usage scenarios.

[0024] 2. In this utility model, the two connecting plates drive the corresponding racks to move. The movement of the racks causes the meshing gears to drive the connecting columns to rotate. When the connecting columns rotate, the bottom locking blocks will remove the restriction on the mounting frame. At the same time as the two front connecting columns rotate, the transmission belt drives the two rear connecting columns to rotate together, so that the locking blocks at the four corners of the bottom of the outer cover lose their fixing effect on the mounting frame, making it easy for workers to remove the mounting frame for cleaning and maintenance of the filter screen and guide plate. Attached Figure Description

[0025] Figure 1 This is a perspective view of the fresh air indoor exhaust hood with a guide port proposed in this utility model;

[0026] Figure 2 This is a front view of the fresh air indoor exhaust hood with a guide port proposed in this utility model;

[0027] Figure 3 This is a split view of the filter screen of the fresh air indoor exhaust hood with a guide port proposed in this utility model;

[0028] Figure 4 This is a structural cross-sectional view of the mounting bracket for the fresh air indoor exhaust hood with a guide port proposed in this utility model;

[0029] Figure 5 for Figure 4 Enlarged view of point A in the middle;

[0030] Figure 6 This is a partial structural schematic diagram of the air guide plate of the fresh air indoor exhaust hood with an air guide port proposed in this utility model;

[0031] Figure 7 This is a cross-sectional view of the outer casing of the fresh air indoor exhaust hood with a guide port proposed in this utility model;

[0032] Figure 8 This is a schematic diagram of the retaining spring structure of the fresh air indoor exhaust hood with a guide port proposed in this utility model.

[0033] Legend:

[0034] 1. Outer cover; 2. Adjustment mechanism; 201. Mounting bracket; 202. Pitch variable groove; 203. Guide plate; 204. Connecting pin one; 205. Connecting pin two; 206. Cavity; 207. Connecting rod; 208. Pitch variable assembly; 2081. Pull rod; 2082. Pull ring; 2083. Positioning groove; 2084. Spring; 2085. Ball bearing; 3. Cavity; 4. Locking mechanism; 401. Connecting post; 402. Locking block; 403. Gear; 404. Rack; 405. Sliding groove; 406. Connecting plate; 407. Transmission belt; 5. Limiting groove; 6. Boss; 7. Filter screen; 8. Knob; 9. Baffle; 10. Snap ring; 11. Locking plate; 12. Limiting post; 13. Positioning rod; 14. Positioning hole; 15. Raised ridge. Detailed Implementation

[0035] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0036] Reference Figure 4 , Figure 5 and Figure 6One embodiment of this utility model provides a fresh air indoor exhaust hood with a guide port, including an outer cover 1, an adjustment mechanism 2 provided on the inner side of the outer cover 1, a cavity 3 opened at the bottom of the inner side of the outer cover 1, and a locking mechanism 4 provided inside the cavity 3.

[0037] The adjustment mechanism 2 includes a mounting frame 201, which is used to mount the guide vane 203 and the filter screen 7. The outer wall of the mounting frame 201 is slidably connected to the inner wall of the outer cover 1. Multiple variable pitch grooves 202 are provided on the left and right sides of the inner side of the mounting frame 201. The variable pitch grooves 202 allow the guide vane 203 to tilt in different directions. Multiple guide vanes 203 are provided on the inner side of the mounting frame 201. The guide vanes 203 are used to change the airflow direction. Connecting pins 204 are fixedly connected to the lower middle part of the left and right sides of the multiple guide vanes 203. The connecting pins 204 drive the guide vanes 203 to move in the variable pitch grooves 202. The upper middle part of the left and right sides of the multiple guide vanes 203 are fixedly connected to the middle part of ... Each part is rotatably connected with a second connecting pin 205. The outer walls of multiple first connecting pins 204 and second connecting pins 205 are slidably connected to the inner side of the corresponding variable pitch slide groove 202. The mounting bracket 201 has cavities 206 on both the left and right sides. The upper part of the inner wall of each cavity 206 is slidably connected with a connecting rod 207. The connecting rod 207 is used to connect with multiple guide plates 203 through the second connecting pins 205. One end of each second connecting pin is fixedly connected to one side of the corresponding connecting rod 207. The connecting rod 207 drives the guide plate 203 to move downward through the second connecting pins 205. The bottom of each connecting rod 207 is provided with a variable pitch assembly 208.

[0038] The variable pitch assembly 208 includes two pull rods 2081. The top ends of the two pull rods 2081 are fixedly connected to the bottom of the corresponding connecting rods 207. The bottom ends of the two pull rods 2081 penetrate the bottom of the inner wall of the cavity 206 and are fixedly connected to a pull ring 2082. The pull ring 2082 facilitates pulling the pull rods 2081. Multiple positioning grooves 2083 are provided on the front and rear sides of the outer wall of the two pull rods 2081. Springs 2084 are provided on the front and rear sides of the outer wall of the two pull rods 2081. A ball bearing 2085 is fixedly connected to an adjacent side of the two springs 2084. The engagement of the top cover ball bearing 2085 with different positioning grooves 2083 allows the guide plate 203 to have different tilt angles. The rear ends of the two springs 2084 are fixedly connected to one side of the inner wall of the cavity 206. The springs 2084 are used to reset the ball bearing 2085. Limiting grooves 5 are provided on both the left and right sides of the inner wall of the outer cover 1. The left and right sides of the mounting bracket 201 are slidably connected to the inner walls of the corresponding limiting grooves 5, and the limiting grooves 5 provide guidance and height limitation for the mounting bracket 201.

[0039] Specifically, by pulling the pull rod 2081 through the pull ring 2082, the connecting rod 207 moves downward, which in turn moves the guide plate 203 downward through the connecting pin 205. Simultaneously, multiple guide plates 203 tilt in the same direction due to the sliding action of the connecting pins 204 and 205 within the variable-pitch groove 202, and the rotation of the connecting pins 205 and the guide plates 203. This mechanism allows the exhaust hood to adjust the airflow range and expand the effective area by tilting the guide plates 203, thereby enhancing the exhaust effect. When the pull rod 2081 drives the connecting rod 207 downward, the spring 208... 4. The ball bearing 2085 is pushed to engage with the positioning grooves 2083 on both sides of the pull rod 2081, thereby fixing the tilt angle of the pull rod 2081 and the guide plate 203. In addition, the ball bearing 2085 can slide out of the positioning groove 2083 after the pulling force is applied. The spring 2084 is compressed and provides a restoring force for the ball bearing 2085. As the pull rod 2081 is pulled, the ball bearing 2085 engages with the next positioning groove 2083 again. Through the multiple positioning grooves 2083 provided on both sides of the pull rod 2081, the tilt angle of the guide plate 203 can be adjusted in multiple positions to adapt to different usage environments.

[0040] Reference Figure 2 , Figure 3 and Figure 7 The locking mechanism 4 includes multiple connecting posts 401 and a transmission belt 407. The tops of the multiple connecting posts 401 are rotatably connected to the four corners of the bottom of the outer cover 1. A locking block 402 is fixedly connected to one side of the outer wall of each of the multiple connecting posts 401. The locking blocks 402 at the four corners limit the mounting bracket 201. The tops of the multiple connecting posts 401 penetrate the bottom of the outer cover 1. Gears 403 are fixedly connected to the middle of the outer wall of the two front connecting posts 401. The gears 403 mesh with the rack 404 to enable the connecting posts 401 to rotate. The front left and right sides of the inner wall of the cavity 3 Each end is slidably connected with a rack 404, and the two racks 404 are respectively meshed with the corresponding gears 403. A sliding groove 405 is provided on the bottom front side of the cavity 3. A connecting plate 406 is fixedly connected to the adjacent side of each of the two racks 404. The front and rear sides of the two connecting plates 406 are respectively slidably connected to the inner wall of the sliding groove 405. The connecting plates 406 on both sides slide in the sliding groove 405, which facilitates the movement of the racks 404. The top of the outer wall of the multiple connecting columns 401 are respectively connected by a corresponding transmission belt 407. The rotation of the multiple connecting columns 401 is synchronized through the transmission belt 407.

[0041] Specifically, when it is necessary to clean the guide plate 203 and the filter screen 7, by squeezing the two connecting plates 406 to bring them closer to the center, the corresponding rack 404 moves. The movement of the rack 404 causes the meshing gear 403 to drive the connecting column 401 to rotate. As the connecting column 401 rotates, the bottom locking block 402 will disengage from the mounting bracket 201. At the same time, the rotation of the two front connecting columns 401 will drive the rear connecting column 401 to rotate together through the transmission belt 407. The locking blocks 402 at the four corners of the bottom of the outer cover 1 will lose their fixing effect on the mounting bracket 201. Subsequently, the mounting bracket 201 will slide downward due to gravity. By squeezing the connecting plate 406 with one hand, the locking mechanism of the mounting bracket 201 is released, making it easy for the staff to remove the mounting bracket 201 for cleaning and maintenance of the filter screen 7 and the guide plate 203.

[0042] Reference Figure 1 , Figure 3 and Figure 6 The upper part of the inner wall of the mounting bracket 201 is fixedly connected to a boss 6, which is used to place the filter screen 7. The top of the boss 6 is equipped with the filter screen 7. The four corners of the top of the mounting bracket 201 are rotatably connected to knobs 8. The bottom of the outer wall of the multiple knobs 8 is fixedly connected to baffles 9. By rotating the knobs 8, the baffles 9 are driven to fix the filter screen 7. The outer size of the filter screen 7 matches the inner size of the mounting bracket 201. Multiple convex ridges 15 are provided on the front and rear sides of the multiple guide plates 203. The convex ridges 15 are used to disrupt the airflow resonance frequency.

[0043] Specifically, by placing the filter 7 above the boss 6, with the boss 6 supporting the filter 7 below, and then rotating the knob 8 to limit the filter 7 from above with the baffle 9, the filter 7 is fixed and used to intercept impurities in the airflow. The raised ridges 15 on the surface of the guide plate 203 disrupt the airflow resonance frequency, reducing noise generation.

[0044] Reference Figure 2 , Figure 3 and Figure 8 The outer cover 1 has retaining springs 10 on both the left and right sides. Each retaining spring 10 has a retaining plate 11 fixedly connected to the other side. The retaining plate 11 can swing by applying force through the action of the retaining springs 10. Each retaining spring 10 has a limiting post 12 on its inner side. Each limiting post 12 has a positioning rod 13 fixedly connected to the adjacent side of its outer wall. The position of the retaining plate 11 can be changed by engaging the positioning rod 13 with the positioning hole 14. Each of the left and right sides of the outer cover 1 has multiple positioning holes 14. Each positioning rod 13 engages with the corresponding positioning hole 14.

[0045] Specifically, when the outer cover 1 is installed in the reserved groove by squeezing the clamping plate 11, as the squeezing is released, the clamping plate 11 rebounds under the action of the retaining spring 10, and the outer cover 1 is locked in the reserved groove. By engaging the positioning rod 13 with different positioning holes 14, the position of the clamping plate 11 is changed, so that the outer cover 1 can be fixed in the reserved groove of different depths by the clamping plate 11.

[0046] Working principle: This device moves the connecting rod 207 downward by pulling the pull rod 2081, causing the connecting rod 207 to move the guide plate 203 downward via the connecting pin 205. Simultaneously, multiple guide plates 203 are subjected to the sliding action of the connecting pin 204 and the connecting pin 205 in the variable-pitch slide groove 202. At the same time, the connecting pin 205 and the guide plate 203 rotate, causing the multiple guide plates 203 to tilt in one direction. This tilting action of the guide plates 203 dynamically adjusts the airflow range, increases the effective area, and improves the exhaust capacity. Furthermore, when the pull rod 2081 moves the connecting rod 207 downward, the spring 20... 84 pushes the ball bearing 2085 to engage with the positioning grooves 2083 on both sides of the pull rod 2081, thus fixing the pull rod 2081 and the tilt angle of the guide plate 203. At the same time, due to the action of the ball bearing 2085, after a certain pulling force is applied to the pull rod 2081, the ball bearing 2085 slides out of the positioning groove 2083, the spring 2084 is compressed and provides a restoring force to the ball bearing 2085. As the pull rod 2081 is pulled, it engages with the next positioning groove 2083. Through the multiple positioning grooves 2083 opened on both sides of the pull rod 2081, the tilt angle of the guide plate 203 can be adjusted to multiple levels to adapt to different usage scenarios.

[0047] Furthermore, when it is necessary to clean the guide plate 203 and the filter screen 7, by squeezing the two connecting plates 406 towards the middle, the connecting plates 406 on both sides simultaneously drive the corresponding racks 404 to move. The movement of the racks 404 causes the meshing gears 403 to drive the connecting column 401 to rotate. When the connecting column 401 rotates, the bottom locking block 402 will release the restriction on the mounting bracket 201. At the same time as the two front connecting columns 401 rotate, the transmission belt 407 drives the two rear connecting columns 401 to rotate together, so that the locking blocks 402 at the four corners of the bottom of the outer cover 1 lose their fixing effect on the mounting bracket 201. Then the mounting bracket 201 slides down by gravity. By squeezing the connecting plate 406 with one hand, the mounting bracket 201 is unlocked, making it easy for the staff to remove the mounting bracket 201 to clean and maintain the filter screen 7 and the guide plate 203.

[0048] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A fresh air indoor exhaust hood with a guide port, comprising an outer cover (1), characterized in that: An adjustment mechanism (2) is provided on the inner side of the outer cover (1), and a cavity (3) is provided at the bottom of the inner side of the outer cover (1). A locking mechanism (4) is provided inside the cavity (3). The adjustment mechanism (2) includes a mounting frame (201). The outer wall of the mounting frame (201) is slidably connected to the inner wall of the outer cover (1). Multiple variable pitch grooves (202) are provided on the left and right sides of the inner side of the mounting frame (201). Multiple guide plates (203) are provided on the inner side of the mounting frame (201). Connecting pin 1 (204) is fixedly connected to the lower middle part of the left and right sides of the multiple guide plates (203). Connecting pin 2 (205) is rotatably connected to the upper middle part of the left and right sides of the multiple guide plates (203). The outer walls of the multiple connecting pins 1 (204) and connecting pins 2 (205) are slidably connected to the inner side of the corresponding variable pitch groove (202). The mounting bracket (201) has cavities (206) on both the left and right sides. The upper part of the inner wall of the two cavities (206) is slidably connected to the connecting rod (207). One end of the multiple connecting pins 2 (205) is fixedly connected to one side of the corresponding connecting rod (207). The bottom of the two connecting rods (207) is provided with a variable pitch assembly (208).

2. The fresh air indoor exhaust hood with a guide port according to claim 1, characterized in that: The locking mechanism (4) includes multiple connecting posts (401) and a transmission belt (407). The top ends of the multiple connecting posts (401) are rotatably connected to the four corners of the bottom of the outer cover (1). A locking block (402) is fixedly connected to one side of the outer wall of each of the multiple connecting posts (401). The top ends of the multiple connecting posts (401) penetrate the bottom of the outer cover (1). Gears (403) are fixedly connected to the middle of the outer wall of the two front connecting posts (401). The front left and right sides of the inner wall of the cavity (3) are... Each end is slidably connected to a rack (404), and the two racks (404) are respectively meshed with the corresponding gears (403). A sliding groove (405) is provided on the front side of the bottom of the cavity (3). A connecting plate (406) is fixedly connected to the adjacent side of each of the two racks (404). The front and rear sides of the two connecting plates (406) are respectively slidably connected to the inner wall of the sliding groove (405). The top of the outer wall of the multiple connecting columns (401) are respectively connected by a corresponding transmission belt (407).

3. The fresh air indoor exhaust hood with a guide port according to claim 1, characterized in that: The variable pitch assembly (208) includes two pull rods (2081). The top ends of the two pull rods (2081) are fixedly connected to the bottom of the corresponding connecting rods (207). The bottom ends of the two pull rods (2081) penetrate the bottom of the inner wall of the cavity (206) and are fixedly connected to a pull ring (2082). Multiple positioning grooves (2083) are provided on the front and rear sides of the outer walls of the two pull rods (2081). Springs (2084) are provided on the front and rear sides of the outer walls of the two pull rods (2081). Ball bearings (2085) are fixedly connected to adjacent sides of the two springs (2084). The rear ends of the two springs (2084) are fixedly connected to one side of the inner wall of the cavity (206).

4. The fresh air indoor exhaust hood with a guide port according to claim 1, characterized in that: The outer cover (1) has a limiting groove (5) on both the left and right sides of its inner wall, and the left and right sides of the mounting bracket (201) are slidably connected to the inner wall of the corresponding limiting groove (5).

5. The fresh air indoor exhaust hood with a guide port according to claim 1, characterized in that: The upper part of the inner wall of the mounting bracket (201) is fixedly connected to a boss (6), and a filter screen (7) is provided on the top of the boss (6). A knob (8) is rotatably connected at the four corners of the top of the mounting bracket (201), and a baffle (9) is fixedly connected to the bottom of the outer wall of the multiple knobs (8).

6. The fresh air indoor exhaust hood with a guide port according to claim 1, characterized in that: The outer cover (1) is provided with retaining rings (10) on both the left and right sides, and retaining plates (11) are fixedly connected to the other side of the two retaining rings (10).

7. The fresh air indoor exhaust hood with a guide port according to claim 6, characterized in that: The inner sides of the two retaining rings (10) are provided with limiting posts (12), and the outer walls of the two limiting posts (12) are fixedly connected with positioning rods (13) on adjacent sides. The left and right sides of the outer cover (1) are provided with multiple positioning holes (14), and the two positioning rods (13) are respectively engaged with the corresponding positioning holes (14).

8. The fresh air indoor exhaust hood with a guide port according to claim 5, characterized in that: The outer dimensions of the filter (7) match the inner dimensions of the mounting bracket (201), and multiple raised ridges (15) are provided on the front and rear sides of the multiple guide plates (203).

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