Indoor fresh air interchanger suitable for heating and ventilation engineering

Abstract

The indoor fresh air ventilation device comprises a device body, a top cover plate is installed at one end of the device body, a filtering mechanism is arranged in the device body, an air supply mechanism is arranged at one end of the filtering mechanism, and an auxiliary mechanism is arranged at one end of the device body. The filtering mechanism comprises symmetrical limiting grooves formed in the device body, matched limiting blocks are installed at one ends of the limiting grooves, and filtering frames are installed at one ends of the limiting blocks; according to the device, the limiting grooves, the filtering frame and the like are arranged, limiting blocks are inserted into the limiting grooves to mount the filtering frame, an operator can conveniently take out the filtering frame subsequently for cleaning, when the filtering frame is taken out, a rotating disc on the side face of the filtering frame can be rotated to drive a rotating column in the filtering frame to rotate, and a lantern ring is driven to rotate through rotation of the rotating column; the two filter screens are driven to slide out of the filter screen groove, the filter screens are rotated out to be cleaned, activated carbon in the activated carbon groove is replaced, and follow-up use is facilitated.

Description

Technical Field

[0001] The invention relates to the technical field of fresh air ventilation devices, and in particular to an indoor fresh air ventilation device suitable for HVAC engineering. Background Art

[0002] The fresh air ventilation device, also known as the fresh air system or fresh air fan, is an indoor environmental conditioning device. As an indoor environmental control device, it plays an important role in improving the indoor air quality. It controls the direction and flow of indoor and outdoor airflows to achieve fresh air replenishment in the building and discharge of polluted air, thereby ensuring the quality and comfort of indoor air. The working principle includes four processes: air purification, fresh air in and out, air conditioning and energy recovery. The fresh air ventilation device will send the outside air into the room after filtering and purifying, and at the same time discharge the polluted air in the room, effectively removing particulate matter, bacteria and harmful gases in the air, forming an indoor air circulation.

[0003] In the prior art, most of the devices used for indoor fresh air ventilation are installed on the ceiling. By connecting the air outlet to the pipe, the filtered air is transported to each room. However, the filter in the ventilation device is mostly bolted and fixed inside the device. After the fresh air ventilation device has been working for a long time, a large amount of dust and debris will remain on the filter in the device, which needs to be cleaned. The fixed filter structure requires the operator to use specific tools to remove the filter. The disassembly and assembly process is time-consuming and labor-intensive, which reduces the applicability of the fresh air ventilation device. Therefore, an indoor fresh air ventilation device suitable for HVAC engineering is needed to meet people's needs. Summary of the invention

[0004] The purpose of the present invention is to provide an indoor fresh air ventilation device suitable for HVAC engineering to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solution: an indoor fresh air ventilation device suitable for HVAC engineering, comprising a device body, a top cover plate is installed at one end of the device body, a filter mechanism is arranged inside the device body, an air supply mechanism is arranged at one end of the filter mechanism, and an auxiliary mechanism is arranged at one end of the device body; Preferably, the filtering mechanism includes symmetrical limit grooves provided in the main body of the device, a matching limit block is installed at one end of the limit groove, a filter frame is installed at one end of the limit block, a filter screen groove is provided in the filter frame, a filter screen matching the filter screen groove is installed in the filter frame, a plurality of activated carbon grooves are provided in the filter screen, a rotating column is rotatably installed at one end of the filter frame, a ring matching the filter screen is threadedly connected to the side of the rotating column, and a rotating disk is rotatably installed between the two filter frames.

[0006] Preferably, the air supply mechanism includes two fixed frames installed in the main body of the device, two air outlets are opened at one end of the fixed frame, a fan is rotatably installed in the fixed frame, a plurality of gear blocks are installed at one end of the fan, a protective shell is installed on the top of the fixed frame, a driving motor is installed in the protective shell, a gear matching the gear block is installed at one end of the driving motor, and two trapezoidal plates are installed in the main body of the device.

[0007] Preferably, the auxiliary mechanism includes two movable grooves provided in the main body of the device, a connected cylindrical groove is provided at one end of the movable groove, a limiting column is slidably installed at one end of the cylindrical groove, a spring is provided on the side of the limiting column, a second clamping block is installed at one end of the limiting column, a second clamping groove adapted to the second clamping block is provided at one end of the limiting block, a plurality of side grooves are provided in the main body of the device, and ultraviolet disinfection lamps are installed in the side grooves.

[0008] Preferably, a symmetrical groove is formed on the side of the top cover plate, a first clamping groove is formed at one end of the device body, and a first clamping block adapted to the first clamping groove is installed at the bottom of the top cover plate.

[0009] Preferably, an air inlet pipe is installed at one end of the device body, and an air outlet pipe is installed at the other end of the device body, and the air inlet pipe is adapted to the air outlet pipe.

[0010] Preferably, the filter screen is slidably mounted in the filter frame, and one end of the rotating disk is rotatably mounted on a rotating column.

[0011] Preferably, a baffle is installed at one end of the fixed frame, the fan is rotatably installed in the fixed frame, and the baffle is adapted to the trapezoidal plate.

[0012] Preferably, the air outlet is matched with the filter frame, and one end of the gear is installed at the output end of the driving motor.

[0013] Preferably, one end of the spring is mounted on the inner wall of the movable groove, and the other end of the spring is mounted on the second clamping block.

[0014] Preferably, a limiting ring is installed on the side of the air outlet pipe, an adjusting bolt is installed at one end of the limiting ring, and the air outlet pipe is matched with the limiting ring.

[0015] Compared with the prior art, the present invention has the following beneficial effects: (1) The present invention provides a limit groove and a filter frame, etc., and installs the filter frame by inserting a limit block into the limit groove, so that the operator can take out the filter frame for cleaning later. When the filter frame is taken out, the rotating disk on the side of the filter frame can be rotated to drive the rotating column in the filter frame to rotate, and the rotation of the rotating column drives the sleeve to rotate, and drives the two filter screens to slide out of the filter screen slot, and the filter screen is rotated out to clean the filter screen and replace the activated carbon in the activated carbon slot, which is convenient for subsequent use.

[0016] (2) The present invention sets a fixed frame and an air outlet, etc. When air enters the fixed frame from the air inlet pipe, the gear is driven to rotate by starting the driving motor, and then the fan in the fixed frame is mobilized to rotate, so that air flows in the main body of the device, and the air is guided to the filter frame through the air outlet, and the air is filtered by the filter frame and the internal filter net, and the filtered air is guided by the trapezoidal plate to be discharged from the air outlet pipe. The ventilation ducts to be installed can be plugged together through the air outlet pipe, and the two limit rings are mobilized to approach each other by rotating the adjusting bolts on the limit rings, and the ducts are clamped and fixed by the limit rings and the sides of the ventilation ducts, leading to each room, completing the ventilation and filtering of the air, making the ventilation more efficient.

[0017] (3) The present invention, by providing a movable groove and a spring, etc., after the installation of the limit block is completed, the limit block needs to be placed and shaken to a certain extent. The limit column is adjusted to slide by pulling the spring. The limit column slides into the cylindrical groove to compress the spring. One end of the second clamping block is inserted into the second clamping groove on the side of the limit block to limit and fix the limit block to prevent the limit block from shaking when working in the device body. The air filtered in the device body is disinfected and sterilized by multiple ultraviolet disinfection lamps provided in the device body, so that the filtered air is purer, thereby increasing the applicability of the device body. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the three-dimensional structure of an indoor fresh air ventilation device suitable for HVAC engineering proposed by the present invention; Figure 2 This is a schematic diagram of the structure of an air inlet pipe and an air outlet pipe of an indoor fresh air ventilation device suitable for HVAC engineering proposed by the present invention; Figure 3 This is a structural schematic diagram of a fixing frame and air outlet of an indoor fresh air ventilation device suitable for HVAC engineering proposed by the present invention; Figure 4 This is a schematic diagram of the structure of a limit block and a filter frame and other structures of an indoor fresh air ventilation device suitable for HVAC engineering proposed by the present invention; Figure 5 This is a schematic diagram of the structure of a rotating column and a filter screen of an indoor fresh air ventilation device suitable for HVAC engineering proposed by the present invention; Figure 6 This is a schematic cross-sectional structure diagram of a limit block and an ultraviolet disinfection lamp and other structures of an indoor fresh air ventilation device suitable for HVAC engineering proposed by the present invention; Figure 7 This is a schematic diagram of the structure of a driving motor and gears of an indoor fresh air ventilation device suitable for HVAC engineering proposed by the present invention; Figure 8 This is a schematic cross-sectional structure diagram of a top cover plate and a first clamping block and other structures of an indoor fresh air ventilation device suitable for HVAC engineering proposed by the present invention; Fig. 9 for Figure 6 Enlarged view of point A.

[0019] In the figure: 1, device body; 2, filter mechanism; 3, air supply mechanism; 4, auxiliary mechanism; 5, top cover plate; 6, pull groove; 7, first clamping groove; 8, first clamping block; 9, air inlet pipe; 10, air outlet pipe; 11, limit ring; 12, adjustment bolt; 13, baffle; 201, limit groove; 202, limit block; 203, filter frame; 204, filter screen groove; 205, filter screen; 206, activated carbon groove; 207, rotating Column; 208, collar; 209, rotating disk; 301, fixed frame; 302, air outlet; 303, fan; 304, gear block; 305, protective shell; 306, drive motor; 307, gear; 308, trapezoidal plate; 401, movable groove; 402, cylindrical groove; 403, limit column; 404, spring; 405, second clamping block; 406, second clamping groove; 407, side groove; 408, ultraviolet disinfection lamp. DETAILED DESCRIPTION

[0020] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, 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 limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0021] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] Example 1: Please refer to Figure 1-9The present invention provides a technical solution: an indoor fresh air ventilation device suitable for HVAC engineering, comprising a device body 1, a top cover plate 5 is installed at one end of the device body 1, a filter mechanism 2 is arranged in the device body 1, an air supply mechanism 3 is arranged at one end of the filter mechanism 2, and an auxiliary mechanism 4 is arranged at one end of the device body 1; the filter mechanism 2 comprises a symmetrical limit groove 201 arranged in the device body 1, an adaptive limit block 202 is installed at one end of the limit groove 201, a filter frame 203 is installed at one end of the limit block 202, a filter screen groove 204 is arranged in the filter frame 203, a filter screen 205 adapted to the filter screen groove 204 is installed in the filter frame 203, a plurality of activated carbon grooves 206 are arranged in the filter screen 205, and a rotating column is rotatably installed at one end of the filter frame 203 207, a sleeve ring 208 adapted to the filter screen 205 is threadedly connected to the side of the rotating column 207, a rotating disk 209 is rotatably installed between the two filter frames 203, a symmetrical drawing groove 6 is opened on the side of the top cover plate 5, a first clamping groove 7 is opened at one end of the device body 1, and a first clamping block 8 adapted to the first clamping groove 7 is installed at the bottom of the top cover plate 5, an air inlet pipe 9 is installed at one end of the device body 1, and an air outlet pipe 10 is installed at the other end of the device body 1, and the air inlet pipe 9 is adapted to the air outlet pipe 10, and the filter screen 205 is slidably installed in the filter frame 203, one end of the rotating disk 209 is rotatably installed on the rotating column 207, a limiting ring 11 is installed on the side of the air outlet pipe 10, and one end of the limiting ring 11 is installed with an adjusting bolt 12, and the air outlet pipe 10 and the limiting The filter mechanism 2 in the device body 1 is adapted to the ring 11. When the device body 1 needs to be used for a period of time, some dust and attached impurities will be generated on the filter mechanism 2 in the device body 1. At this time, the filter mechanism 2 in the device body 1 needs to be cleaned. The top cover plate 5 is opened by holding the pull groove 6 on the device body 1, so that the first clamping block 8 is taken out from the first clamping groove 7, and the limiting block 202 is pulled out along the limiting groove 201, and then the filter frame 203 is taken out as a whole, and the surface of the filter frame 203 is cleaned. When the filter net 205 in the filter frame 203 needs to be cleaned, the rotating disk 209 on the side of the filter frame 203 is rotated, and the rotating disk 209 rotates to drive the rotating column 207 to rotate, and then the two sleeve rings 208 on the side of the rotating column 207 are rotated, and the rotating column 207 is rotated. The threads at both ends of 207 are distributed in opposite directions. When rotating, the collar 208 drives the two filter screens 205 to slide in the filter frame 203, and the filter screen 205 slides out through the filter screen slot 204. The activated carbon is replaced through the multiple activated carbon slots 206 on the filter screen 205, which is convenient for absorbing impurities and odors in the air during use. After cleaning and replacement, the rotating disk 209 is rotated in the opposite direction, and the two filter screens 205 are collected into the filter frame 203 by rotating the rotating column 207, and then the limit block 202 is installed in the device body 1 through the limit slot 201. When it is necessary to guide the filtered air, a pipeline needs to be installed, and one end of the pipeline is plugged into the air outlet pipe 10. By rotating the adjusting bolt 12, the two limit rings 11 on the side of the air outlet pipe 10 are driven to move closer to each other.The side of the limiting ring 11 is abutted against the air outlet pipe 10 to clamp and fix the pipe. One end of the pipe is clamped and fixed, and the pipe is extended to each room to filter the air in the room. The stability of the pipe is ensured by the clamping of the limiting ring 11. By setting the filter mechanism 2 in a detachable manner, when the device body 1 has been working for a period of time, it is convenient for the operator to clean and maintain the structure in the device body 1 without the help of any tools, thereby improving the applicability of the device body 1.

[0024] Example 2: Figure 3 and 7 As shown, in order to increase the ventilation effect of the fresh air ventilation device, an air supply mechanism 3 is arranged in the device body 1, and the air supply mechanism 3 includes two fixed frames 301 installed in the device body 1, and two air outlets 302 are provided at one end of the fixed frame 301. A fan 303 is rotatably installed in the fixed frame 301, and a plurality of gear blocks 304 are installed at one end of the fan 303. A protective shell 305 is installed on the top of the fixed frame 301, and a driving motor 306 is installed in the protective shell 305. A gear 307 adapted to the gear block 304 is installed at one end of the driving motor 306. Two trapezoidal plates 308 are installed in the device body 1, and a baffle 13 is installed at one end of the fixed frame 301. The fan 303 is rotatably installed in the fixed frame 301, and the baffle 13 is adapted to the trapezoidal plate 308. The air outlet 302 is adapted to the filter frame 203, and one end of the gear 307 is installed at the input of the driving motor 306. At the outlet end, when the device body 1 is working, the gear 307 is driven to rotate by starting the drive motor 306, and then the gear block 304 meshing with the gear 307 is driven to rotate, and the air is circulated through the fan 303. The air enters the fixed frame 301 through the air inlet pipe 9, and is discharged to the filter frame 203 through the air outlet 302. After being filtered by the filter frame 203 and the filter net 205, it is disinfected and sterilized by the ultraviolet disinfection lamp 408. When the filtered air circulates in the device body 1, the baffle 13 and the trapezoidal plate 308 guide the air, and the slope of the trapezoidal plate 308 drives the air to be discharged through the air outlet pipe 10. When the purified air circulates in the device body 1, it is blocked by the baffle 13 and the trapezoidal plate 308, and will be discharged through the air outlet pipe 10 along the blocking range. The two air outlet pipes 10 do not interfere with each other, and the other features are the same as those in Example 1.

[0025] Example 3: Figure 6 and 9As shown, after the filter mechanism 2 is installed, the limit block 202 needs to be fixed by the auxiliary mechanism 4, and the auxiliary mechanism 4 includes two movable grooves 401 provided in the device body 1, and a connected cylindrical groove 402 is provided at one end of the movable groove 401, and a limit column 403 is slidably installed at one end of the cylindrical groove 402, and a spring 404 is sleeved on the side of the limit column 403, and a second clamping block 405 is installed at one end of the limit column 403, and a second clamping groove 406 adapted to the second clamping block 405 is provided at one end of the limit block 202. A plurality of side grooves 407 are provided in the device body 1, and an ultraviolet disinfection lamp 408 is installed in the side groove 407. One end of the spring 404 is installed on the inner wall of the movable groove 401, and the other end of the spring 404 is installed on the second clamping block 405. By pulling the springs 404 at both ends of the device body 1 to slide in the movable groove 401, the limiting column 403 is driven to slide into the cylindrical groove 402. At this time, the spring 404 is compressed, and one end of the second clamping block 405 is separated from the second clamping groove 406 at one end of the limiting block 202, canceling the limiting of the limiting block 202, and installing the limiting block 202 in the device body 1 through the limiting groove 201. When the limiting block 202 is installed, the side surface of the limiting block 202 is abutted against the second clamping block 405, so that the second clamping block 405 shrinks into the movable groove 401. When the limiting block 202 is installed to the appropriate position, the spring 404 rebounds and drives the second clamping block 405 to be inserted into the second clamping groove 406, completing the limiting of the limiting block 202, ensuring the stability of the filtering structure 2 during use, and the remaining features are the same as those of Example 1.

[0026] The working principle is as follows: after the device body 1 needs to be used for a period of time, some dust and attached impurities will be generated on the filter mechanism 2 in the device body 1, and the filter mechanism 2 in the device body 1 needs to be cleaned. The top cover plate 5 is opened by holding the pull groove 6 on the device body 1, so that the first clamping block 8 is taken out from the first clamping groove 7, and the springs 404 at both ends of the device body 1 are pulled to slide in the movable groove 401 to drive the limiting column 403 to slide into the cylindrical groove 402. At this time, the spring 404 is compressed, and one end of the second clamping block 405 is separated from the second clamping groove 406 at one end of the limiting block 202, the limiting of the limiting block 202 is cancelled, and the limiting block 202 is pulled out along the limiting groove 201, and then the filter frame 203 is taken out as a whole. The surface of the filter frame 203 is cleaned. When the filter screen 205 in the filter frame 203 needs to be cleaned, the rotating disk 209 on the side of the filter frame 203 is rotated. The rotating disk 209 rotates to drive the rotating column 207 to rotate, and then drives the two rings 208 on the side of the rotating column 207 to rotate. The threads at both ends of the rotating column 207 are distributed in opposite directions. When rotating, the rings 208 drive the two filter screens 205 to slide in the filter frame 203, and the filter screen 205 slides out through the filter screen slot 204. The activated carbon is replaced through the multiple activated carbon slots 206 on the filter screen 205, which is convenient for absorbing impurities and odors in the air during use. After cleaning and replacement, the rotating disk 209 is rotated in the opposite direction, and the two filter screens 205 are rotated by rotating the rotating column 207. 406, and then the gear 307 is driven to rotate by the drive motor 306, and then the gear block 304 engaged with the gear 307 is driven to rotate, and the air is circulated through the fan 303, and the air enters the fixed frame 301 through the air inlet pipe 9, and is discharged to the filter frame 203 through the air outlet 302. After filtering, the filter frame 203 and the filter net 205 are disinfected and sterilized by the ultraviolet disinfection lamp 408. When the filtered air circulates in the device body 1, the baffle 13 and the trapezoidal plate 308 guide the air, and the slope of the trapezoidal plate 308 drives the air to be discharged through the air outlet pipe 10 to produce pure air. When it is necessary to guide the filtered air, it is necessary to install a pipeline, plug one end of the pipeline into the air outlet pipe 10, and drive the two limiting rings 11 on the side of the air outlet pipe 10 to move closer to each other by rotating the adjusting bolt 12. The side of the limiting ring 11 is against the air outlet pipe 10, and one end of the pipeline is clamped and fixed, and the pipeline is extended to each room to filter the indoor air. The stability of the pipeline is ensured by the clamping of the limiting ring 11.By setting the filter mechanism 2 in a detachable manner, after the device body 1 has been working for a period of time, it is convenient for the operator to clean and maintain the structure inside the device body 1 without the aid of any tools, thereby improving the applicability of the device body 1.

[0027] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An indoor fresh air ventilation device suitable for HVAC engineering, comprising a device body (1), characterized in that: A top cover plate (5) is installed at one end of the device body (1); a filter mechanism (2) is provided inside the device body (1); an air supply mechanism (3) is provided at one end of the filter mechanism (2); and an auxiliary mechanism (4) is provided at one end of the device body (1); The filtering mechanism (2) comprises a symmetrical limiting groove (201) provided in a device body (1); a matching limiting block (202) is installed at one end of the limiting groove (201); a filter frame (203) is installed at one end of the limiting block (202); a filter screen groove (204) is provided in the filter frame (203); a filter screen (205) matching the filter screen groove (204) is installed in the filter frame (203); a plurality of activated carbon grooves (206) are provided in the filter screen (205); a rotating column (207) is rotatably installed at one end of the filter frame (203); a collar (208) matching the filter screen (205) is threadedly connected to the side surface of the rotating column (207); and a rotating disk (209) is rotatably installed between the two filter frames (203).

2. According to claim 1, an indoor fresh air ventilation device suitable for HVAC engineering is characterized in that: The air supply mechanism (3) comprises two fixed frames (301) installed in the device body (1), one end of the fixed frame (301) is provided with two air outlets (302), a fan (303) is rotatably installed in the fixed frame (301), one end of the fan (303) is provided with a plurality of gear blocks (304), a protective shell (305) is installed on the top of the fixed frame (301), a driving motor (306) is installed in the protective shell (305), one end of the driving motor (306) is provided with a gear (307) adapted to the gear block (304), and two trapezoidal plates (308) are installed in the device body (1).

3. According to claim 1, an indoor fresh air ventilation device suitable for HVAC engineering is characterized by: The auxiliary mechanism (4) comprises two movable grooves (401) provided in the device body (1); a connected cylindrical groove (402) is provided at one end of the movable groove (401); a limit column (403) is slidably mounted at one end of the cylindrical groove (402); a spring (404) is sleeved on the side of the limit column (403); a second clamping block (405) is mounted at one end of the limit column (403); a second clamping groove (406) adapted to the second clamping block (405) is provided at one end of the limit block (202); a plurality of side grooves (407) are provided in the device body (1); and an ultraviolet disinfection lamp (408) is mounted in the side groove (407).

4. The indoor fresh air ventilation device suitable for HVAC engineering according to claim 1, characterized in that: A symmetrical groove (6) is provided on the side of the top cover plate (5), a first clamping groove (7) is provided at one end of the device body (1), and a first clamping block (8) adapted to the first clamping groove (7) is installed at the bottom of the top cover plate (5).

5. The indoor fresh air ventilation device suitable for HVAC engineering according to claim 1, characterized in that: An air inlet pipe (9) is installed at one end of the device body (1), and an air outlet pipe (10) is installed at the other end of the device body (1), and the air inlet pipe (9) is compatible with the air outlet pipe (10).

6. The indoor fresh air ventilation device suitable for HVAC engineering according to claim 1, characterized in that: The filter screen (205) is slidably mounted in the filter frame (203), and one end of the rotating disk (209) is rotatably mounted on the rotating column (207).

7. The indoor fresh air ventilation device suitable for HVAC engineering according to claim 2, characterized in that: A baffle (13) is installed at one end of the fixed frame (301), the fan (303) is rotatably installed in the fixed frame (301), and the baffle (13) is compatible with the trapezoidal plate (308).

8. The indoor fresh air ventilation device suitable for HVAC engineering according to claim 2, characterized in that: The air outlet (302) is matched with the filter frame (203), and one end of the gear (307) is installed at the output end of the drive motor (306).

9. The indoor fresh air ventilation device suitable for HVAC engineering according to claim 3, characterized in that: One end of the spring (404) is mounted on the inner wall of the movable groove (401), and the other end of the spring (404) is mounted on the second clamping block (405).

10. The indoor fresh air ventilation device suitable for HVAC engineering according to claim 5, characterized in that: A limiting ring (11) is installed on the side of the air outlet pipe (10), an adjusting bolt (12) is installed on one end of the limiting ring (11), and the air outlet pipe (10) is compatible with the limiting ring (11).

Images