Multifunctional constant air volume valve

Abstract

The invention relates to a multifunctional constant air volume valve which comprises a valve body, an adjusting blade arranged in the valve body and a rotary filtering and drying structure arranged at the inlet end of the valve body. When airflow enters the inlet end of the valve body, the rotary filtering and drying structure freely and circumferentially rotates under the action of the airflow, the rotary filtering and drying structure is mixed with the airflow containing impurities and moisture and adsorbs the impurities and the moisture, and the purified airflow is discharged to the outlet end of the valve body through the adjusting blades. The rotary filtering and drying structure comprises an annular frame arranged on the inner wall of the valve body, the air inlet end face of the annular frame is provided with a plurality of rotary guide fan blades which are circumferentially distributed at equal intervals, and a sealed ball auxiliary rotating assembly is arranged between the outer wall of the annular frame and the inner wall of the valve body. The constant air volume valve has the advantages of improving the purification quality, reducing the air resistance at the front end of the valve body, avoiding influencing the opening degree of the valve body blades and ensuring the connection stability when the constant air volume valve is used.

Description

Technical Field

[0001] The invention belongs to the field of air volume valves, and in particular relates to a multifunctional constant air volume valve. Background Art

[0002] The constant air volume valve is a mechanical self-powered 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 air flow force in the air duct to position and control the valve opening, thereby maintaining the airflow at a preset flow rate within the entire pressure difference range.

[0003] When the air quality of the external environment is not high, after the dust carried in the air enters the constant air volume valve, the dust will accumulate in the valve body, especially when the air contains a certain humidity, the dust containing water vapor will adhere to the valve body blades, affecting the center of gravity and distribution density of the blades, thereby affecting the opening degree of the valve body, and the indoor air is easily polluted. At present, there is also a filter frame structure set at the inlet end of the constant air volume valve, but when replacing the filter frame, the constant air volume valve and the filter frame need to be disassembled as a whole. After multiple disassemblies, the constant air volume valve body and the filter frame are prone to looseness, which in turn affects the sealing performance. The filter frame only uses its own mesh structure to filter dust, and cannot filter very small particles and moisture. In addition, a fixed filter frame structure is set at the front end of the valve body, which increases wind resistance and affects the power of the terminal fan. Therefore, it is necessary to provide a multifunctional constant air volume valve that can not only improve the purification quality and avoid affecting the opening degree of the valve body blades, but also ensure the connection stability of the constant air volume valve body when it is used. Summary of the invention

[0004] The purpose of the present invention is to overcome the above shortcomings and provide a multifunctional constant air volume valve to improve purification quality, reduce the wind resistance at the front end of the valve body, avoid affecting the opening degree of the valve body blades, and ensure the connection stability of the constant air volume valve when in use.

[0005] The object of the present invention is achieved by the following technical scheme: a multifunctional constant air volume valve, comprising a valve body, an adjusting blade disposed in the valve body, and a rotary filter drying structure disposed at the inlet end of the valve body; when airflow enters the inlet end of the valve body, the rotary filter drying structure rotates freely in a circle under the action of the airflow, the rotary filter drying structure mixes with the airflow containing impurities and moisture and absorbs the impurities and moisture, and the purified airflow is discharged to the outlet end of the valve body through the adjusting blade; The rotary filtering and drying structure includes an annular frame arranged on the inner wall of the valve body, the air inlet end face of the annular frame has a plurality of equally spaced circumferentially distributed rotating guide blades, a sealed ball auxiliary rotation assembly is provided between the outer wall of the annular frame and the inner wall of the valve body, a plurality of equally circumferentially distributed purification chambers are provided in the annular frame, an activated carbon bag is provided in the purification chamber, a plurality of rotating guide blade rings are provided outside the purification chamber, a plurality of replacement through holes corresponding to and connected to the plurality of purification chambers are provided on the outer circumference of the valve body near the rotating opening and closing clamping ring assembly, and a rotating opening and closing clamping ring assembly for opening and closing the plurality of replacement through holes is provided on the outer circumference of the valve body near the annular frame.

[0006] A further improvement of the present invention is that the annular frame includes a first ring near the inlet end of the valve body and a second ring near the adjusting blade position, the first ring and the second ring both have grid grille plates inside, the center of the first ring and the center of the second ring have hollow connecting columns, a partition plate is provided between the first ring and the second ring to separate the ring into a plurality of purification chambers, and a plurality of rotating guide blades are arranged on the outer side wall of the first ring.

[0007] A further improvement of the present invention is that the sealed ball auxiliary rotation assembly includes a ball track 1 respectively arranged on the outer walls of the first ring and the second ring, and a ball track 2 on the inner wall of the valve body, the ball track 1 corresponds to the ball track 2 in sequence, and there are multiple evenly distributed balls between the ball track 1 and the corresponding ball track 2.

[0008] A further improvement of the present invention is that: both sides of the ball track 1 and the ball track 2 are provided with embedded grooves, and both sides of the plurality of balls are provided with sealing rings; The sealing ring comprises an arc-shaped portion with an opening facing the plurality of balls and an extension portion horizontally and perpendicularly to both side ends of the arc-shaped portion, and one end of the extension portion away from the arc-shaped portion is embedded in the corresponding embedding groove.

[0009] A further improvement of the present invention is that: the rotating opening and closing clamping ring assembly includes a rotating ring sleeved on the outer circumference of the valve body, the width of the rotating ring is greater than the width of the replacement through hole on the valve body, the rotating ring has multiple opening and closing holes for opening or closing the multiple replacement through holes, the multiple opening and closing holes correspond to the multiple replacement through holes in sequence, the inner wall of the rotating ring near the multiple opening and closing holes has a rubber sealing layer, and a limit clamp is provided between the rotating ring and the valve body for guiding the rotation or locking the rotating ring.

[0010] A further improvement of the present invention is that the limit clamp includes a limit slide groove arranged on both sides of the replacement through hole on the valve body and a limit guide rod placed on the inner wall of the rotating ring. The limit guide rod and the limit slide groove are arranged correspondingly in sequence. The lower end of the limit guide rod has a guiding arc surface, and the two end positions in the limit slide groove have arc bosses for locking and limiting the limit guide rod. A locking cavity groove for accommodating the guiding arc surface is provided between the arc boss and the side end of the limit slide groove, and the bottom surface of the locking cavity groove protrudes from the bottom surface of the limit slide groove.

[0011] 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 a 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 a transition fit.

[0012] A further improvement of the present invention is that: when the guide arc surface is embedded in the locking cavity groove at the end of one side of the corresponding limiting slide groove, the opening and closing holes on the rotating ring and the replacement through holes on the valve body are connected in sequence, thereby realizing the opening of the replacement through holes on the valve body; when the guide arc surface is embedded in the locking cavity groove at the end of the other side of the corresponding limiting slide groove, the opening and closing holes on the rotating ring and the replacement through holes on the valve body are staggered in sequence, thereby realizing the closing of the replacement through holes on the valve body.

[0013] A further improvement of the present invention is that: a plurality of auxiliary handles are provided on the outer circumference of the rotating ring to drive the rotating ring to rotate, a positioning piece is movably hinged on the side of the auxiliary handle, the positioning piece has a positioning hole, and the valve body has two positioning pins matched with each positioning hole; When the positioning piece cooperates with a corresponding positioning pin, the valve body is in an open state, and the valve body and the rotating ring are in a locked state; when the positioning piece cooperates with another corresponding positioning pin, the valve body is in a closed state, and the valve body and the rotating ring are in a locked state.

[0014] Compared with the prior art, the present invention has the following advantages: 1. The present invention arranges a rotary filter-drying assembly at the inlet end of the valve body of the constant air volume valve. The rotary guide blades of the rotary filter-drying assembly drive the annular frame to freely rotate with the air flow in the valve body under the action of the air flow force. The rotating air flow quickly passes through the activated carbon bag in the purification chamber in the annular frame and is quickly mixed with the activated carbon bag. Impurities and moisture in the rotating air flow are adsorbed by the activated carbon bag, thereby improving the purification quality, avoiding affecting the opening degree of the regulating blades, and ensuring the stability of the constant air volume valve. The rotary filter-drying assembly adopts a rotating structure to reduce the wind resistance at the front end of the valve body and avoid affecting the power usage of the terminal fan.

[0015] 2. When replacing the activated carbon bag in the purification chamber of the present invention, the rotating opening and closing clamping ring assembly is rotated so that the replacement through hole on the valve body and the opening and closing hole on the rotating ring correspond in sequence, and the activated carbon bag in the purification chamber can be replaced without repeatedly disassembling the filter assembly as a whole, thereby ensuring the connection stability of the constant air volume valve when in use. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of a multifunctional constant air volume valve in the present invention.

[0017] Figure 2 for Figure 1 A cross-sectional view of the connection between the rotary filter-dryer assembly and the valve body.

[0018] Figure 3 for Figure 2 Structural section view along AA axis.

[0019] Figure 4 for Figure 3 A magnified schematic diagram of structure B.

[0020] Figure 5 It is a schematic structural diagram of the rotary opening and closing clamping ring assembly in the present invention.

[0021] Figure 6 It is a schematic structural diagram of the position limiting clamp in the present invention.

[0022] Numbers in the figure: 1-valve body, 2-adjusting blades, 3-rotary filter drying assembly; 31-annular frame, 32-rotating guide blades, 33-sealed ball auxiliary rotation assembly, 34-purification chamber, 35-activated carbon bag, 36-replacement through hole, 37-rotating opening and closing clamping ring assembly; 311-first ring, 312-second ring, 313-grid grille plate, 314-hollow connecting column, 315-partition plate; 331-ball track one, 332-ball track two, 333-ball, 334-embedded groove, 335-sealing ring; 3351-arc-shaped portion, 3352-extension portion; 371-rotating ring, 372-opening and closing hole, 373-rubber sealing layer, 374-limiting card, 375-auxiliary handle, 376-positioning sheet, 377-positioning hole, 378-positioning pin; 3741-limiting slide groove, 3742-limiting guide rod, 3743-guide arc surface, 3744-arc boss, 3745-locking cavity groove. DETAILED DESCRIPTION

[0023] In order to deepen the understanding of the present invention, the present invention will be further described in detail below in conjunction with embodiments and drawings. The embodiments are only used to explain the present invention and do not constitute a limitation on the protection scope of the present invention.

[0024] In the description of the present invention, it is necessary to understand that terms indicating orientation or positional relationships, such as orientation or positional relationships based on the drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the structure or unit referred to must have a specific orientation. Therefore, it should not be understood as a limitation on the present invention.

[0025] In the present invention, unless otherwise clearly stipulated and limited, terms such as "connected", "provided with", "having" and the like 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 said to be a mechanical connection, or it can be directly connected, or it can be connected through an intermediate medium. For those skilled in the art, the basic meaning of the above terms in the present invention can be understood according to the specific circumstances.

[0026] A multifunctional constant air volume valve, refer to Figures 1 to 3 , comprising a valve body 1, an adjusting blade 2 disposed in the valve body 1, and a rotary filter drying structure 3 disposed 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 circle under the action of the airflow, the rotary filter drying structure 3 mixes with the airflow containing impurities and moisture and absorbs the impurities and moisture, and the purified airflow passes through the adjusting blade 2 and is discharged to the outlet end of the valve body 1; The rotary filtering and drying structure 3 includes an annular frame 31 arranged on the inner wall of the valve body 1, and the air inlet end face of the annular frame 31 has a plurality of equally spaced circumferentially distributed rotating guide blades 32, and a sealed ball auxiliary rotating assembly 33 is provided between the outer wall of the annular frame 31 and the inner wall of the valve body 1, and a plurality of equally circumferentially distributed purification chambers 34 are provided in the annular frame 31, and an activated carbon bag 35 is provided in the purification chamber 34, and a plurality of rotating guide blades 32 are arranged on the outside of the purification chamber 34, and a plurality of replacement through holes 36 corresponding to the plurality of purification chambers 34 are provided on the outer circumference of the valve body 1 near the rotating opening and closing clamping ring assembly 37, and the outer circumference of the valve body 1 near the annular frame 31 has a rotating opening and closing clamping ring assembly 37 for opening and closing the plurality of replacement through holes 36.

[0027] The present invention sets a rotary filter-drying assembly 3 at the inlet end of the valve body 1 of the constant air volume valve. The rotary guide blades 32 of the rotary filter-drying assembly 3 drive the annular frame 31 to rotate freely with the air flow in the valve body 1 under the action of the air flow force. The rotating air flow quickly passes through the activated carbon bag 35 in the purification chamber 34 in the annular frame 31 and is quickly mixed with the activated carbon bag 35. Impurities and moisture in the rotating air flow are adsorbed by the activated carbon bag 35, thereby improving the purification quality, avoiding affecting the opening degree of the regulating blade 2, and ensuring the stability of the constant air volume valve. The rotary filter-drying assembly 3 adopts a rotating structure to reduce the wind resistance at the front end of the valve body 1 and avoid affecting the power usage of the terminal fan.

[0028] On the basis of 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 regulating blade 2. The first ring 311 and the second ring 312 both have grid grille plates 313 inside. The center of the first ring 311 and the center of the second ring 312 have hollow connecting columns 314. There is a partition plate 315 between the first ring 311 and the second ring 312 to separate the purification chambers 34. A plurality of rotating guide blades 32 are arranged on the outer wall of the first ring 311.

[0029] Based on this embodiment, refer to Figure 4 The sealed ball auxiliary rotation assembly 33 includes a ball track 1 331 respectively arranged on the outer walls of the first ring 311 and the second ring 312, and a ball track 2 332 on the inner wall of the valve body 1. The ball track 1 331 corresponds to the ball track 2 332 in sequence, and there are multiple evenly distributed balls 333 between the ball track 1 331 and the corresponding ball track 2 332.

[0030] On the basis of this embodiment, the ball track 1 331 and the ball track 2 332 are provided with embedded grooves 334 on both sides of the ball 333, and the two sides of the plurality of balls 333 are provided with sealing rings 335; The sealing ring 335 includes an arc portion 3351 with an opening toward the plurality of balls 333 and extension portions 3352 that are horizontally and perpendicularly disposed to both sides of the arc portion 3351 . One end of the extension portion 3352 away from the arc portion 3351 is embedded in the corresponding embedding groove 334 .

[0031] It should be noted that since the rotary filter-dryer assembly 3 rotates on the inner wall of the valve body 1, in order to prevent impurities and moisture contained in the air flow from clogging the connection between the rotary filter-dryer assembly 3 and the valve body 1 and affecting the normal rotation of the rotary filter-dryer assembly 3, in the present 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, and the sealing rings 335 on both side ends of the balls 333 serve to seal and prevent dust, thereby preventing impurities and moisture from adhering to the balls 333 and affecting the normal circumferential rotation of the annular frame 31.

[0032] Based on this embodiment, refer to Figure 5The rotating opening and closing clamping ring assembly 37 includes a rotating ring 371 sleeved on the outer circumference of the valve body 1, the width of the rotating ring 371 is greater than the width of the replacement through hole 36 on the valve body 1, the rotating ring 371 has a plurality of opening and closing holes 372 for opening or closing the plurality of replacement through holes 36, the plurality of opening and closing holes 372 correspond to the plurality of replacement through holes 36 in sequence, the inner wall of the rotating ring 371 near the plurality of opening and closing holes 372 has a rubber sealing layer 373, and a limit clamp 374 is provided between the rotating ring 371 and the valve body 1 for guiding the rotation or locking the rotating ring 371.

[0033] When replacing the activated carbon bag 35 in the purification chamber 34, the present invention rotates the rotating opening and closing clamping ring assembly 37 so that the replacement through hole 36 on the valve body 1 corresponds to the opening and closing hole on the rotating ring 371 in sequence, and the activated carbon bag 35 in the purification chamber 34 can be replaced without repeatedly disassembling the filter assembly as a whole, thereby ensuring the connection stability of the constant air volume valve when in use. The provision of 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 in a closed state.

[0034] Based on this embodiment, refer to Figure 6 The limiting clamp 374 includes a limiting slide groove 3741 arranged 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 correspondingly in sequence. The lower end of the limiting guide rod 3742 has a guiding arc surface 3743, and the two end positions in the limiting slide groove 3741 have arc bosses 3744 for locking and limiting the limiting guide rod 3742. A locking cavity groove 3745 is provided between the arc boss 3744 and the side end of the limiting slide groove 3741, and the guiding arc surface 3743 is embedded. The bottom surface of the locking cavity groove 3745 protrudes from the bottom surface of the limiting slide groove 3741.

[0035] When the guiding 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 a clearance fit; when the guiding 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 a transition fit.

[0036] When the guide arc surface 3743 is embedded in the locking cavity groove 3745 at the end of one side 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 realizing the opening of 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 end of the other side 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 realizing the closing of the replacement through hole 36 on the valve body 1.

[0037] 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, there is a transition fit between the rotating ring 371 and the valve body 1. 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.

[0038] On the basis of this embodiment, the outer circumference of the rotating ring 371 is provided with a plurality of auxiliary handles 375 for driving the rotating ring 371 to rotate. A positioning piece 376 is movably hinged on the side of the auxiliary handle 375. The positioning piece 376 has a positioning hole 377. The valve body 1 has two positioning pins 378 that match each positioning hole 377. When the positioning plate 376 cooperates with a corresponding positioning pin 378, the valve body 1 is in an open state, and the valve body 1 and the rotating ring 371 are in a locked state; when the positioning plate 376 cooperates with another corresponding positioning pin 378, the valve body 1 is in a closed state, and the valve body 1 and the rotating ring 371 are in a locked state.

[0039] Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A multifunctional constant air volume valve, characterized in that: The invention comprises a valve body (1), an adjusting blade (2) disposed in the valve body (1), and a rotary filter drying structure (3) disposed at the inlet end of the valve body (1); when 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 absorbs the impurities and moisture, and the purified airflow passes through the adjusting blade (2) and is discharged to the outlet end of the valve body (1); The rotary filtering and drying structure (3) comprises an annular frame (31) arranged on the inner wall of a valve body (1); the air inlet end surface of the annular frame (31) has a plurality of rotating guide blades (32) distributed circumferentially at equal intervals; a sealed ball auxiliary 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 purification chambers (34) distributed circumferentially at equal intervals; the purification chambers (34) have activated carbon bags (35); the plurality of rotating guide blades (32) are arranged outside the purification chambers (34); the outer circumference of the valve body (1) near the rotating opening and closing type clamping ring assembly (37) has a plurality of replacement through holes (36) corresponding to the plurality of purification chambers (34); the outer circumference of the valve body (1) near the annular frame (31) has a rotating opening and closing type clamping ring assembly (37) for opening and closing the plurality of replacement through holes (36).

2. A multifunctional constant air volume valve according to claim 1, characterized in that: The annular frame (31) comprises a first ring (311) located near the inlet end of the valve body (1) and a second ring (312) located near the regulating blade (2); the first ring (311) and the second ring (312) both have grid plates (313) inside; the center of the first ring (311) and the center of the second ring (312) have hollow connecting columns (314); a partition plate (315) is located between the first ring (311) and the second ring (312) to separate the first ring (311) and the second ring (312) into a plurality of purification chambers (34); and the plurality of rotating guide blades (32) are arranged on the outer side wall of the first ring (311).

3. A multifunctional constant air volume valve according to claim 2, characterized in that: The sealed ball auxiliary rotation assembly (33) comprises a ball track 1 (331) respectively arranged on the outer walls of the first ring (311) and the second ring (312), and a ball track 2 (332) on the inner wall of the valve body (1), wherein the ball track 1 (331) corresponds to the ball track 2 (332) in sequence, and a plurality of evenly distributed balls (333) are provided between the ball track 1 (331) and the corresponding ball track 2 (332).

4. A multifunctional constant air volume valve according to claim 3, characterized in that: The ball track 1 (331) and the ball track 2 (332) are provided with embedded grooves (334) on both sides of the ball (333), and both sides of the plurality of balls (333) are provided with sealing rings (335); The sealing ring (335) comprises an arc-shaped portion (3351) with an opening facing the plurality of balls (333) and extension portions (3352) horizontally and perpendicularly to both side ends of the arc-shaped portion (3351); one end of the extension portion (3352) away from the arc-shaped portion (3351) is embedded in a corresponding embedding groove (334).

5. A multifunctional constant air volume valve according to claim 3, characterized in that: The rotating opening and closing clamping ring assembly (37) comprises a rotating ring (371) sleeved on the outer circumference of the valve body (1); the width of the rotating ring (371) is greater than the width of the replacement through hole (36) on the valve body (1); the rotating ring (371) has a plurality of opening and closing holes (372) for opening or closing the plurality of replacement through holes (36); the plurality of opening and closing holes (372) correspond to the plurality of replacement through holes (36) in sequence; the inner wall of the rotating ring (371) near the plurality of opening and closing holes (372) has a rubber sealing layer (373); and a limit clamp (374) for guiding the rotation or locking the rotating ring (371) is provided between the rotating ring (371) and the valve body (1).

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

7. A 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), a clearance fit is formed between the rotating ring (371) and the valve body (1); when the guide arc surface (3743) of the limiting guide rod (3742) is placed in the locking cavity groove (3745), a transition fit is formed between the rotating ring (371) and the valve body (1).

8. A 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 the end of one side of the corresponding limiting 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 realizing the opening of 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 end of the other side of the corresponding limiting 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 realizing the closing of 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) is provided with a plurality of auxiliary handles (375) for driving the rotating ring (371) to rotate. A positioning piece (376) is movably hinged on the side of the auxiliary handle (375). The positioning piece (376) has a positioning hole (377). The valve body (1) has two positioning pins (378) that match each positioning hole (377). When the positioning sheet (376) cooperates with a corresponding positioning pin (378), the valve body (1) is in an open state, at which time the valve body (1) and the rotating ring (371) are in a locked state; when the positioning sheet (376) cooperates with another corresponding positioning pin (378), the valve body (1) is in a closed state, at which time the valve body (1) and the rotating ring (371) are in a locked state.

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