A multifunctional constant air volume valve

Abstract

The present application relates to a kind of multifunctional constant air volume valve, including valve body, the adjusting blade being placed in valve body and the rotary filter drying structure being placed in the position of the inlet end of valve body;When air flow enters the inlet end of valve body, rotary filter drying structure is free circumferential rotation under the action of air flow, and rotary filter drying structure is mixed with the impurity and moisture of air flow and adsorbs its impurity and moisture, and the air flow after purification is discharged to the outlet end of valve body by adjusting blade;Rotary filter drying structure includes annular frame arranged in the inner wall of valve body, the air inlet end surface of annular frame has a plurality of equidistant circumferential distribution rotary guide fan blade, and there is sealed ball auxiliary rotating component between the outer wall of annular frame and the inner wall of valve body.The present application has the following advantages: improve purification quality, reduce the resistance of valve body front end, while avoiding affecting the opening degree of valve body blade, ensure the connection stability when constant air volume valve is used.

Description

Technical Field

[0001] This invention belongs to the field of air volume valves, specifically relating to a multifunctional constant air volume valve. Background Technology

[0002] A constant air volume valve is a mechanical self-regulating device suitable for ventilation and air conditioning systems that require a constant air volume. The constant air volume valve does not require external power to control the air volume. It relies on the airflow force in the duct to position and control the valve opening, thereby maintaining the airflow at a preset flow rate throughout the entire pressure difference range.

[0003] When the external air quality is poor, dust carried in the air enters the constant air volume valve and accumulates inside the valve body. Especially when the air contains a certain amount of humidity, the dust containing moisture adheres to the valve blades, affecting their center of gravity and distribution density, thus impacting the valve's opening degree. Furthermore, indoor air is easily polluted. Currently, some constant air volume valves have a filter frame structure at the inlet. However, replacing the filter frame requires disassembling the entire valve and filter frame. After repeated disassembly, the valve body and filter frame can become loose, affecting the sealing performance. Moreover, the filter frame only uses its mesh structure to filter dust and cannot filter extremely fine particles or moisture. Additionally, a fixed filter frame structure at the front end of the valve increases air resistance and affects the power of the terminal fan. Therefore, a multi-functional constant air volume valve is needed that can improve purification quality, avoid affecting the valve blade opening degree, and ensure connection stability during use. Summary of the Invention

[0004] The purpose of this invention is to overcome the above-mentioned shortcomings and provide a multifunctional constant air volume valve that improves purification quality, reduces air resistance at the valve body front end, avoids affecting the opening degree of the valve body blades, and ensures the connection stability of the constant air volume valve during use.

[0005] The objective of this invention is achieved through the following technical solution: a multifunctional constant air volume valve, comprising a valve body, an adjusting blade placed inside the valve body, and a rotary filter drying structure placed at the inlet end of the valve body; when the airflow enters the inlet end of the valve body, the rotary filter drying structure rotates freely in a circular motion under the action of the airflow, the rotary filter drying structure mixes with the airflow containing impurities and moisture and adsorbs the impurities and moisture, and the purified airflow is discharged to the outlet end of the valve body through the adjusting blade.

[0006] The rotary filter drying structure includes an annular frame disposed on the inner wall of the valve body. The air inlet end face of the annular frame has multiple equally spaced circumferentially distributed rotary guide vanes. A sealed ball-assisted rotating assembly is disposed between the outer wall of the annular frame and the inner wall of the valve body. The annular frame has multiple equally distributed purification chambers, each containing an activated carbon pack. Multiple rotary guide vanes are arranged around the outside of the purification chambers. The outer circumference of the valve body near the rotary opening and closing retaining ring assembly has multiple replacement through holes corresponding to the multiple purification chambers. The outer circumference of the valve body near the annular frame has a rotary opening and closing retaining ring assembly for opening and closing the multiple replacement through holes.

[0007] A further improvement of the present invention is that: the annular frame includes a first ring near the valve body inlet and a second ring near the adjusting blade. Both the first and second rings have a grid plate inside. The center of the first ring and the center of the second ring have a hollow connecting column. There is a partition plate between the first and second rings that divides them into multiple purification chambers. Multiple rotating guide vanes are arranged on the outer wall of the first ring.

[0008] A further improvement of the present invention is that: the sealed ball-assisted rotation assembly includes a ball track one respectively disposed on the outer wall of the first ring and the second ring, and a ball track two disposed on the inner wall of the valve body, the ball track one and the ball track two corresponding to each other in sequence, and there are multiple evenly distributed balls between the ball track one and the corresponding ball track two.

[0009] A further improvement of the present invention is that: both ball track one and ball track two are located on both sides of the ball and have grooves, and both sides of the multiple balls have sealing rings;

[0010] The sealing ring includes an arc-shaped portion with an opening facing multiple balls and an extension portion that is horizontal and perpendicular to both ends of the arc-shaped portion. The end of the extension portion away from the arc-shaped portion is embedded in a corresponding groove.

[0011] A further improvement of the present invention is that: the rotary opening and closing retaining ring assembly includes a rotary ring sleeved on the outer circumference of the valve body, the width of the rotary ring being greater than the width of the replacement through hole on the valve body, the rotary ring having multiple opening and closing holes for opening or closing multiple replacement through holes, the multiple opening and closing holes corresponding to multiple replacement through holes in sequence, the inner wall of the rotary ring having a rubber sealing layer around the multiple opening and closing holes, and a limiting retainer between the rotary ring and the valve body for guiding the rotation or locking the rotary ring.

[0012] A further improvement of the present invention is that: the limiting clip includes limiting grooves on both sides of the replacement through hole on the valve body and a limiting guide rod placed on the inner wall of the rotating ring. The limiting guide rod and the limiting groove are arranged in sequence and correspond to each other. The lower end of the limiting guide rod has a guiding arc surface. The two ends of the limiting groove have arc bosses that lock and limit the limiting guide rod. There is a locking cavity groove between the arc boss and the side end of the limiting groove to accommodate the guiding arc surface. The bottom surface of the locking cavity groove protrudes from the bottom surface of the limiting groove.

[0013] A further improvement of the present invention is that: when the guide arc surface of the limiting guide rod is placed in the limiting slide groove, the rotating ring and the valve body are in clearance fit; when the guide arc surface of the limiting guide rod is placed in the locking cavity groove, the rotating ring and the valve body are in transition fit.

[0014] A further improvement of the present invention is that: when the guide arc surface is embedded in the locking cavity groove at one end of the corresponding limiting slide groove, the opening and closing hole on the rotating ring and the replacement through hole on the valve body are sequentially connected, thereby realizing the opening of the replacement through hole on the valve body; when the guide arc surface is embedded in the locking cavity groove at the other end of the corresponding limiting slide groove, the opening and closing hole on the rotating ring and the replacement through hole on the valve body are sequentially staggered, thereby realizing the closing of the replacement through hole on the valve body.

[0015] A further improvement of the present invention is that: the outer circumference of the rotating ring has a plurality of auxiliary handles that drive it to rotate, and a positioning plate is movably hinged to the side of the auxiliary handle. The positioning plate has a positioning hole, and the valve body has two positioning pins that cooperate with each positioning hole.

[0016] When the positioning plate engages with the corresponding positioning pin, the valve body is in the open state, and the valve body and the rotating ring are in the locked state; when the positioning plate engages with the corresponding other positioning pin, the valve body is in the closed state, and the valve body and the rotating ring are in the locked state.

[0017] Compared with the prior art, the present invention has the following advantages:

[0018] 1. This invention features a rotary filter-drying assembly installed at the inlet end of the constant air volume valve body. The rotating guide vanes of the rotary filter-drying assembly, under the influence of airflow, drive the annular frame to rotate freely within the valve body. The rotating airflow rapidly passes through the activated carbon pack within the purification chamber within the annular frame and mixes quickly with the activated carbon pack. Impurities and moisture in the rotating airflow are adsorbed by the activated carbon pack, improving purification quality and preventing any impact on the opening degree of the regulating vanes, thus ensuring the stability of the constant air volume valve. The rotary filter-drying assembly employs a rotating structure, reducing the air resistance at the valve body front end and preventing any impact on the power consumption of the terminal fan.

[0019] 2. When replacing the activated carbon pack in the purification chamber, the present invention rotates the rotating and opening retaining ring assembly so that the replacement through hole on the valve body corresponds to the opening and closing hole on the rotating ring in sequence, thereby replacing the activated carbon pack in the purification chamber without repeatedly disassembling the entire filter assembly, ensuring the connection stability of the constant air volume valve during use. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of a multifunctional constant air volume valve in this invention.

[0021] Figure 2 for Figure 1 Cross-sectional view of the connection between the rotary filter drying assembly and the valve body.

[0022] Figure 3 for Figure 2 Cross-sectional view of the structure along the AA direction.

[0023] Figure 4 for Figure 3 An enlarged schematic diagram of structure B in the middle.

[0024] Figure 5 This is a schematic diagram of the rotating and opening snap ring assembly in this invention.

[0025] Figure 6 This is a schematic diagram of the limiting card component in this invention.

[0026] Numbering on the map:

[0027] 1-Valve body, 2-Adjusting blades, 3-Rotary filter and drying assembly;

[0028] 31- Annular frame, 32- Rotary guide vane, 33- Sealed ball-assisted rotating assembly, 34- Purification chamber, 35- Activated carbon bag, 36- Replacement through hole, 37- Rotary opening and closing retaining ring assembly;

[0029] 311-First ring, 312-Second ring, 313-Grid plate, 314-Hollow connecting column, 315-Divider plate; 331-Ball track one, 332-Ball track two, 333-Ball, 334-Groove, 335-Sealing ring; 3351-Arc-shaped part, 3352-Extension part; 371-Rotating ring, 372-Opening hole, 373-Rubber sealing layer, 374-Limiting clip, 375-Auxiliary handle, 376-Positioning piece, 377-Positioning hole, 378-Positioning pin; 3741-Limiting groove, 3742-Limiting guide rod, 3743-Guide arc surface, 3744-Arc boss, 3745-Locking cavity groove. Detailed Implementation

[0030] To enhance understanding of the present invention, the present invention will be further described in detail below with reference to embodiments and accompanying drawings. These embodiments are only used to explain the present invention and do not constitute a limitation on the scope of protection of the present invention.

[0031] In the description of this invention, it should be understood that the terms indicating orientation or positional relationship, such as those based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the structure or unit referred to must have a specific orientation, and therefore should not be construed as a limitation of this invention.

[0032] In this invention, unless otherwise explicitly specified and limited, terms such as “connection,” “provided with,” and “have” should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection. They can be described as a mechanical connection, a direct connection, or a connection through an intermediate medium. Those skilled in the art can understand the basic meaning of the above terms in this invention according to the specific circumstances.

[0033] A multi-functional constant air volume valve, as described above. Figures 1 to 3 It includes a valve body 1, an adjusting blade 2 placed inside the valve body 1, and a rotary filter drying structure 3 placed at the inlet end of the valve body 1. When the airflow enters the inlet end of the valve body 1, the rotary filter drying structure 3 rotates freely in a circular motion under the action of the airflow. The rotary filter drying structure 3 mixes with the airflow containing impurities and moisture and adsorbs the impurities and moisture. The purified airflow is discharged to the outlet end of the valve body 1 through the adjusting blade 2.

[0034] The rotary filter drying structure 3 includes an annular frame 31 disposed on the inner wall of the valve body 1. The air inlet end face of the annular frame 31 has multiple equally spaced circumferentially distributed rotary guide vanes 32. A sealed ball-assisted rotating assembly 33 is disposed between the outer wall of the annular frame 31 and the inner wall of the valve body 1. The annular frame 31 has multiple equally distributed circumferentially distributed purification chambers 34. Activated carbon packs 35 are disposed in the purification chambers 34. Multiple rotary guide vanes 32 are arranged around the outside of the purification chambers 34. The outer circumference of the valve body 1 near the rotary opening and closing retaining ring assembly 37 has multiple replacement through holes 36 corresponding to and communicating with the multiple purification chambers 34. The outer circumference of the valve body 1 near the annular frame 31 has a rotary opening and closing retaining ring assembly 37 for opening and closing the multiple replacement through holes 36.

[0035] This invention provides a rotary filter-drying assembly 3 at the inlet end of the valve body 1 of a constant air volume valve. The rotating guide vanes 32 of the rotary filter-drying assembly 3 drive the annular frame 31 to rotate freely within the valve body 1 under the action of airflow force. The rotating airflow quickly passes through the activated carbon pack 35 in the purification chamber 34 within the annular frame 31 and mixes rapidly with the activated carbon pack 35. Impurities and moisture in the rotating airflow are adsorbed by the activated carbon pack 35, improving the purification quality and avoiding affecting the opening degree of the regulating vanes 2, thus ensuring the stability of the constant air volume valve. The rotary filter-drying assembly 3 adopts a rotating structure, reducing the air resistance at the front end of the valve body 1 and avoiding affecting the power consumption of the terminal fan.

[0036] Based on this embodiment, the annular frame 31 includes a first ring 311 near the inlet end of the valve body 1 and a second ring 312 near the adjusting blade 2. Both the first ring 311 and the second ring 312 have a grid plate 313. The center of the first ring 311 and the center of the second ring 312 have a hollow connecting column 314. There is a partition plate 315 between the first ring 311 and the second ring 312, which divides the first ring 311 and the second ring 312 into multiple purification chambers 34. Multiple rotating guide vanes 32 are arranged on the outer wall of the first ring 311.

[0037] Based on this embodiment, refer to Figure 4 The sealed ball-assisted rotating assembly 33 includes a ball track 331 on the outer wall of the first ring 311 and the second ring 312 respectively, and a ball track 332 on the inner wall of the valve body 1. The ball track 331 and the ball track 332 correspond to each other in sequence, and there are multiple evenly distributed balls 333 between the ball track 331 and the corresponding ball track 332.

[0038] Based on this embodiment, ball track 1 331 and ball track 2 332 are located on both sides of ball 333 and have grooves 334, and multiple balls 333 have sealing rings 335 on both sides.

[0039] The sealing ring 335 includes an arcuate portion 3351 with an opening facing a plurality of balls 333 and an extension portion 3352 that is horizontal and perpendicular to both ends of the arcuate portion 3351. One end of the extension portion 3352 away from the arcuate portion 3351 is embedded in a corresponding groove 334.

[0040] It should be noted that since the rotary filter drying assembly 3 rotates on the inner wall of the valve body 1, in order to prevent impurities and moisture in the airflow from clogging the connection between the rotary filter drying assembly 3 and the valve body 1 and affecting the normal rotation of the rotary filter drying assembly 3, in this application, the balls 333 on the outer end faces of the first ring 311 and the second ring 312 serve to facilitate the rotation of the annular frame 31, while the sealing rings 335 on both sides of the balls 333 serve to seal and prevent dust, preventing impurities and moisture from adhering to the balls 333 and affecting the normal circumferential rotation of the annular frame 31.

[0041] Based on this embodiment, refer to Figure 5 The rotary opening and closing retaining ring assembly 37 includes a rotary ring 371 sleeved on the outer circumference of the valve body 1. The width of the rotary ring 371 is greater than the width of the replacement through hole 36 on the valve body 1. The rotary ring 371 has multiple opening and closing holes 372 that open or close the multiple replacement through holes 36. The multiple opening and closing holes 372 correspond to the multiple replacement through holes 36 in sequence. The inner wall of the rotary ring 371 has a rubber sealing layer 373 around the multiple opening and closing holes 372. There is a limiting retainer 374 between the rotary ring 371 and the valve body 1 to guide the rotation or lock the rotary ring 371.

[0042] When replacing the activated carbon pack 35 in the purification chamber 34, this invention rotates the rotating and opening retaining ring assembly 37 so that the replacement through hole 36 on the valve body 1 corresponds sequentially to the opening and closing hole on the rotating ring 371, allowing the activated carbon pack 35 in the purification chamber 34 to be replaced without repeatedly disassembling the entire filter assembly, ensuring the connection stability of the constant air volume valve during use. Furthermore, the rubber sealing layer 373 improves the sealing performance between the valve body 1 and the rotating ring 371 when the valve body 1 is closed.

[0043] Based on this embodiment, refer to Figure 6 The limiting clip 374 includes a limiting slide groove 3741 disposed on both sides of the replacement through hole 36 on the valve body 1 and a limiting guide rod 3742 disposed on the inner wall of the rotating ring 371. The limiting guide rod 3742 and the limiting slide groove 3741 are arranged in sequence and correspond to each other. The lower end of the limiting guide rod 3742 has a guide arc surface 3743. Both ends of the limiting slide groove 3741 have arc bosses 3744 for locking and limiting the limiting guide rod 3742. Between the arc bosses 3744 and the side ends of the limiting slide groove 3741, there is a locking cavity groove 3745 for the guide arc surface 3743 to be embedded. The bottom surface of the locking cavity groove 3745 protrudes from the bottom surface of the limiting slide groove 3741.

[0044] When the guide arc surface 3743 of the limiting guide rod 3742 is placed in the limiting slide groove 3741, the rotating ring 371 and the valve body 1 are in clearance fit; when the guide arc surface 3743 of the limiting guide rod 3742 is placed in the locking cavity groove 3745, the rotating ring 371 and the valve body 1 are in transition fit.

[0045] When the guide arc surface 3743 is embedded in the locking cavity groove 3745 at one end of the corresponding limiting slide groove 3741, the opening and closing hole 372 on the rotating ring 371 and the replacement through hole 36 on the valve body 1 are sequentially connected, thereby opening the replacement through hole 36 on the valve body 1; when the guide arc surface 3743 is embedded in the locking cavity groove 3745 at the other end of the corresponding limiting slide groove 3741, the opening and closing hole 372 on the rotating ring 371 and the replacement through hole 36 on the valve body 1 are sequentially staggered, thereby closing the replacement through hole 36 on the valve body 1.

[0046] It should be noted that when the limiting guide rod 3742 is placed in the limiting slide groove 3741, there is a certain gap between the rotating ring 371 and the valve body 1. At this time, the rotating ring 371 can rotate arbitrarily. When the limiting guide rod 3742 is embedded in the locking cavity groove 3745, the rotating ring 371 and the valve body 1 are in transition fit. At this time, the valve body 1 and the rotating ring 371 clamp the rubber sealing layer 373 to ensure the internal sealing of the valve body 1 in the closed state.

[0047] Based on this embodiment, the outer circumference of the rotating ring 371 has a plurality of auxiliary handles 375 that drive it to rotate. A positioning plate 376 is movably hinged to the side of the auxiliary handle 375. The positioning plate 376 has a positioning hole 377. The valve body 1 has two positioning pins 378 that cooperate with each positioning hole 377.

[0048] When the positioning plate 376 engages with the corresponding positioning pin 378, the valve body 1 is in the open state, and the valve body 1 and the rotating ring 371 are in the locked state; when the positioning plate 376 engages with the corresponding other positioning pin 378, the valve body 1 is in the closed state, and the valve body 1 and the rotating ring 371 are in the locked state.

[0049] Those skilled in the art should understand that this invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to this invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A multifunctional constant air volume valve, characterized in that: It includes a valve body (1), an adjusting blade (2) placed inside the valve body (1), and a rotary filter drying structure (3) placed at the inlet end of the valve body (1). The rotary filter drying structure (3) includes an annular frame (31) disposed on the inner wall of the valve body (1). The air inlet end face of the annular frame (31) has a plurality of equally spaced circumferentially distributed rotary guide vanes (32). A sealed ball-assisted rotating assembly (33) is provided between the outer wall of the annular frame (31) and the inner wall of the valve body (1). The annular frame (31) has a plurality of equally distributed purification chambers (34). The purification chambers (34) have activated carbon packs (35). The plurality of rotary guide vanes (32) are arranged around the outside of the purification chambers (34). The outer circumference of the valve body (1) has a plurality of replacement through holes (36) corresponding to and communicating with the plurality of purification chambers (34). The valve body (1) near the outer circumference of the annular frame (31) has a rotary opening and closing retaining ring assembly (37) for opening and closing the plurality of replacement through holes (36). The plurality of replacement through holes (36) are close to the rotary opening and closing retaining ring assembly (37). When the airflow enters the inlet end of the valve body (1), the rotating guide vane drives the annular frame to rotate freely in the valve body under the action of the airflow force, so that the rotary filter drying structure (3) rotates freely in a circle under the action of the airflow. The rotary filter drying structure (3) mixes with the airflow containing impurities and moisture and adsorbs the impurities and moisture. The purified airflow is discharged to the outlet end of the valve body (1) through the regulating vane (2).

2. The multifunctional constant air volume valve according to claim 1, characterized in that: The annular frame (31) includes a first ring (311) near the inlet end of the valve body (1) and a second ring (312) near the adjusting blade (2). Both the first ring (311) and the second ring (312) have a grid plate (313). The center of the first ring (311) and the center of the second ring (312) have a hollow connecting column (314). There is a partition plate (315) between the first ring (311) and the second ring (312) that divides the internal space of the annular frame into multiple purification chambers (34). Multiple rotating guide vanes (32) are arranged on the outer wall of the first ring (311).

3. The multifunctional constant air volume valve according to claim 2, characterized in that: The sealed ball-assisted rotating assembly (33) includes a ball track one (331) respectively disposed on the outer wall of the first ring (311) and the second ring (312), and a ball track two (332) disposed on the inner wall of the valve body (1). The ball track one (331) and the ball track two (332) correspond to each other in sequence, and there are multiple evenly distributed balls (333) between the ball track one (331) and the corresponding ball track two (332).

4. The multifunctional constant air volume valve according to claim 3, characterized in that: The first ball track (331) and the second ball track (332) are located on both sides of the ball (333) and have grooves (334). Both sides of the multiple balls (333) have sealing rings (335). The sealing ring (335) includes an arc-shaped portion (3351) with an opening facing a plurality of balls (333) and an extension portion (3352) extending outward from both ends of the arc-shaped portion (3351), the end of the extension portion (3352) away from the arc-shaped portion (3351) being embedded in a corresponding groove (334).

5. The multifunctional constant air volume valve according to claim 3, characterized in that: The rotary opening and closing retaining ring assembly (37) includes a rotary ring (371) sleeved on the outer circumference of the valve body (1). The width of the rotary ring (371) is greater than the width of the replacement through hole (36) on the valve body (1). The rotary ring (371) has multiple opening and closing holes (372) that open or close multiple replacement through holes (36). The multiple opening and closing holes (372) correspond to the multiple replacement through holes (36) in sequence. The inner wall of the rotary ring (371) has a rubber sealing layer (373) around the multiple opening and closing holes (372). There is a limiting retainer (374) between the rotary ring (371) and the valve body (1) to guide the rotation or lock the rotary ring (371).

6. The multifunctional constant air volume valve according to claim 5, characterized in that: The limiting clip (374) includes a limiting slide groove (3741) set on both sides of the replacement through hole (36) on the valve body (1) and a limiting guide rod (3742) placed on the inner wall of the rotating ring (371). The limiting guide rod (3742) and the limiting slide groove (3741) are arranged in sequence. The lower end of the limiting guide rod (3742) has a guide arc surface (3743). The two ends of the limiting slide groove (3741) have arc bosses (3744) for locking and limiting the limiting guide rod (3742). Between the arc bosses (3744) and the side ends of the limiting slide groove (3741), there is a locking cavity groove (3745) that accommodates the guide arc surface (3743). The bottom surface of the locking cavity groove (3745) protrudes from the bottom surface of the limiting slide groove (3741).

7. The multifunctional constant air volume valve according to claim 6, characterized in that: When the guide arc surface (3743) of the limiting guide rod (3742) is placed in the limiting slide groove (3741), the rotating ring (371) and the valve body (1) are in clearance fit; when the guide arc surface (3743) of the limiting guide rod (3742) is placed in the locking cavity groove (3745), the rotating ring (371) and the valve body (1) are in transition fit.

8. The multifunctional constant air volume valve according to claim 7, characterized in that: When the guide arc surface (3743) is embedded in the locking cavity groove (3745) at one end of the corresponding limiting slide groove (3741), the opening and closing hole (372) on the rotating ring (371) and the replacement through hole (36) on the valve body (1) are connected in sequence, thereby opening the replacement through hole (36) on the valve body (1); when the guide arc surface (3743) is embedded in the locking cavity groove (3745) at the other end of the corresponding limiting slide groove (3741), the opening and closing hole (372) on the rotating ring (371) and the replacement through hole (36) on the valve body (1) are staggered in sequence, thereby closing the replacement through hole (36) on the valve body (1).

9. A multifunctional constant air volume valve according to claim 8, characterized in that: The outer circumference of the rotating ring (371) has multiple auxiliary handles (375) that drive it to rotate. A positioning plate (376) is movably hinged to the side of the auxiliary handle (375). The positioning plate (376) has a positioning hole (377). The valve body (1) has two positioning pins (378) that cooperate with each positioning hole (377). When the positioning plate (376) engages with the corresponding positioning pin (378), the valve body (1) is in the open state, and the valve body (1) and the rotating ring (371) are in the locked state; when the positioning plate (376) engages with the corresponding other positioning pin (378), the valve body (1) is in the closed state, and the valve body (1) and the rotating ring (371) are in the locked state.

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