A constant air volume valve

Abstract

The utility model discloses a constant air volume valve, the inside of valve body is equipped with air duct, be equipped with horizontal shaft with valve body rotation connection in air duct, be equipped with first vane on horizontal shaft, first vane includes the main windward part and the auxiliary windward part of the column in horizontal shaft opposite two sides, be equipped with crossbeam in air duct, be equipped with first elastic sheet between crossbeam and first vane, be equipped with the fairing for guiding airflow to the main windward part flow in air duct, air volume adjusting mechanism is transmission connection with horizontal shaft, is used for drive horizontal shaft rotation to an initial position, and is configured to allow horizontal shaft to rotate back and forth between initial position and an adjustment position deviating from initial position. The utility model can realize the dynamic regulation of air volume, to maintain air volume constant, overall structure is not sensitive to ambient temperature, and the failure rate is low, and the service life is long, effectively satisfies the regulation demand of air volume.

Description

Technical Field

[0001] This utility model relates to the field of ventilation equipment technology, and in particular to a constant air volume valve. Background Technology

[0002] A constant air volume valve is a mechanical self-regulating device suitable for ventilation 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] Chinese patent document application number 201821845180.3 discloses an independent constant air volume valve mechanism with dynamically adjustable air pressure. It achieves dynamic adjustment of the valve body's air pressure through the interaction of an air bladder, a torsion spring, and blades. When the static air pressure at the inlet and outlet is at its minimum, the air bladder is in a contracted state; when the static pressure at the inlet and outlet increases, airflow enters the air bladder, causing it to expand, thereby rotating the blades towards the flow-limiting plate at a certain angle, reducing the gap between the blades and the surrounding area, and keeping the flow rate constant within a certain air pressure range. When the airflow decreases, the torsion spring adjusts the blades at a certain angle, thus achieving dynamic adjustment of the air pressure. In the above technical solution, the air bladder is sensitive to ambient temperature. The air bladder will produce errors due to thermal expansion and contraction in high or low temperature environments, resulting in poor airflow balance adjustment. Furthermore, the air bladder is prone to aging, leading to an increased failure rate and reduced lifespan of the device, making it difficult to effectively meet the airflow adjustment requirements. Utility Model Content

[0004] To address the aforementioned technical problems, the purpose of this utility model is to propose a constant air volume valve that can dynamically adjust the air volume to maintain a constant air volume. The overall structure is insensitive to ambient temperature, has a low failure rate, a long service life, and effectively meets the air volume adjustment requirements.

[0005] The technical solution of this utility model is achieved as follows: a constant air volume valve, including a valve body and an air volume adjustment mechanism;

[0006] The valve body has an internal air duct;

[0007] The air duct is provided with a horizontal shaft that is rotatably connected to the valve body; the horizontal shaft is provided with a first blade; the first blade includes a main windward portion and a secondary windward portion arranged on opposite sides of the horizontal shaft;

[0008] The air duct is provided with a crossbeam fixedly connected to the valve body; a first spring is provided between the crossbeam and the first blade; the first spring has a spring force that drives the main windward part to rotate towards the air inlet end of the air duct.

[0009] The air duct is equipped with a guide vane to direct airflow toward the main windward section;

[0010] The airflow adjustment mechanism is connected to the horizontal shaft drive to drive the horizontal shaft to an initial position and is configured to allow the horizontal shaft to rotate back and forth between the initial position and an adjusted position deviating from the initial position.

[0011] Furthermore, the horizontal axis is eccentrically positioned relative to the first blade; the area of ​​the main windward portion is larger than the area of ​​the secondary windward portion.

[0012] Furthermore, the airflow adjustment mechanism includes a pull rod; the first end of the pull rod is hooked to the elastic end of the second spring plate, and the second end is hooked to the free end of the long arm.

[0013] Furthermore, the airflow adjustment mechanism includes a rotating rod, a second spring plate, a long arm, and a locking component;

[0014] The rotating rod is arranged in the same direction as the horizontal axis and is rotatably connected to the valve body; the second spring is disposed on the rotating rod and has a spring end extending toward or away from the horizontal axis; the long arm is disposed on the horizontal axis and has a free end extending toward or away from the rotating rod; the spring end of the second spring and the free end of the long arm are linked together.

[0015] The locking element is disposed between the valve body and the rotating rod, and has a locked state that fixes the rotating rod and the valve body relatively, and an unlocked state that allows the rotating rod and the valve body to move relatively.

[0016] Furthermore, the locking element includes a stud and a locking nut; an indicator disc is provided on the outer side of the valve body on the rotating rod; the indicator disc is provided with an arc-shaped groove formed with the center of the rotating rod as the center; the stud is fixed to the outer wall of the valve body and inserted into the arc-shaped groove; the locking nut is threadedly connected to the stud; in the locked state, the indicator disc is clamped between the outer wall of the valve body and the locking nut.

[0017] Furthermore, the outer wall of the valve body is provided with an arc-shaped scale with the center of the rotating rod as the center of the scale corresponding to the indicator dial.

[0018] Furthermore, the second spring has a fixed end away from the elastic end; the second spring includes a plurality of stacked metal sheets; the length of each metal sheet increases sequentially from the fixed end of the second spring; the fixed end of the second spring is connected to a rotating rod; wherein, the end of the longest metal sheet away from the fixed end forms the elastic end of the second spring.

[0019] Furthermore, a second blade is provided inside the air duct on the air inlet side or air outlet side of the first blade; the second blade is provided with a central shaft rotatably connected to the valve body; the second blade has a normally open position for opening the air duct and a normally closed position for closing the air duct; an elastic element is provided between the central shaft and the valve body; the elastic element has a spring force that drives the second blade to move towards the normally closed position; in the normally open position, a heat-fused element is provided between the second blade and the crossbeam.

[0020] Furthermore, the melting temperature of the hot melt component is 70℃-150℃.

[0021] Due to the application of the above technical solution, this utility model has the following advantages compared with the prior art:

[0022] 1. This utility model, through the use of a guide plate, directs most of the airflow entering the duct towards the main windward portion of the first blade. With the assistance of an airflow adjustment mechanism, the first blade can be rotated to an initial position to control its initial opening angle within the duct. The horizontal axis and the first blade can rotate back and forth between the initial position and an adjustable position deviating from the initial position. When the incoming airflow changes, the angle of the first blade dynamically changes under the elastic force of the first spring, thus dynamically changing the gap between the first blade and the duct. Through this method, dynamic airflow adjustment can be achieved, maintaining a constant airflow. The first spring is insensitive to ambient temperature and can adapt to high or low temperature environments. The overall structure has a low failure rate, long service life, and effectively meets the airflow adjustment requirements.

[0023] 2. With the cooperation of the second spring, the torque applied by the second spring to the horizontal axis and the elastic force applied by the first spring to the main windward part are kept in dynamic balance, so that the horizontal axis and the first blade can rotate back and forth between the initial position and the adjustment position. Moreover, the second spring is not sensitive to the ambient temperature and can adapt to high or low temperature environments, making it highly practical.

[0024] 3. This utility model utilizes the combined use of a heat-fused component and a second blade. Under the pull of the heat-fused component, the second blade remains in the normally open position, thus enabling ventilation. In the event of a fire, the heat-fused component melts upon heating, and under the elastic force of the torsion spring, the second blade switches to the normally closed position, thereby closing the air duct to prevent airflow within the duct and thus preventing the fire from spreading. Attached Figure Description

[0025] The technical solution of this utility model will be further described below with reference to the accompanying drawings:

[0026] Figure 1 This is a three-dimensional structural diagram of the overall structure of this utility model;

[0027] Figure 2 forFigure 1 A sectional view of the structure;

[0028] Figure 3 for Figure 1 Exploded view;

[0029] Figure 4 for Figure 1 Internal structure diagram;

[0030] Figure 5 This is a three-dimensional structural diagram of the second blade of this utility model;

[0031] Figure 6 This is a three-dimensional structural diagram of the first blade of this utility model;

[0032] Figure 7 This is a three-dimensional structural diagram of the first spring of this utility model;

[0033] Figure 8 This is a three-dimensional structural diagram of the second spring of this utility model;

[0034] The components are as follows: 1. Valve body; 11. Air duct; 12. Guide plate; 13. Arc-shaped scale; 2. First blade; 21. Main air intake section; 22. Secondary air intake section; 3. Horizontal axis; 4. Crossbeam; 5. First spring; 6. Second blade; 61. Central shaft; 62. Hot melt component; 63. Torsion spring; 7. Rotating rod; 71. Second spring; 711. Metal sheet; 72. Long arm; 73. Pull rod; 74. Indicator dial; 75. Arc-shaped groove; 76. Stud; 77. Locking nut. Detailed Implementation

[0035] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the scope of protection of the present invention.

[0036] like Figures 1-8The diagram shows a constant air volume valve according to this embodiment. The constant air volume valve includes a valve body 1 and an air volume adjustment mechanism. The valve body 1 has an internal air duct 11 for airflow. The first end of the air duct 11 forms an air inlet, and the second end forms an air outlet. A horizontal shaft 3 is installed inside the air duct 11, extending along the width of the air duct 11. Both ends of the horizontal shaft 3 are rotatably connected to the valve body 1 via bearings. A first blade 2 is mounted on the horizontal shaft 3. The first blade 2 is adapted to the air duct 11. The first blade 2 can rotate with the horizontal shaft 3 to change its angle within the air duct 11, thereby controlling the opening and closing degree of the air duct 11. The horizontal shaft 3 is positioned in the middle of the first blade 2. The first blade 2 includes a main airflow-facing portion 21 and a secondary airflow-facing portion 22, located on opposite sides of the horizontal shaft 3. When the airflow flows within the air duct 11, the main airflow-facing portion 21 receives most of the airflow impact, while the secondary airflow-facing portion 22 receives only a small portion of the airflow impact. A guide vane 12 is installed inside the air duct 11. The guide vane 12 is arranged on the windward side of the first blade 2 at an angle to guide the airflow toward the main windward section 21, so that the main windward section 21 bears most of the impact of the airflow.

[0037] In this embodiment, the aforementioned transverse axis 3 is eccentrically arranged relative to the first blade 2, so that the area of ​​the aforementioned main windward portion 21 is larger than the area of ​​the secondary windward portion 22. Through the above structural design, the airflow impact on the secondary windward component 22 is reduced, thereby improving the airflow guiding capability of the overall structure.

[0038] A crossbeam 4 is arranged inside the aforementioned air duct 11. The crossbeam 4 extends along the width of the air duct 11, and its two ends are fixedly connected to the valve body 1 by riveting or bolting. A first spring plate 5 is installed between the crossbeam 4 and the first blade 2. The first spring plate 5 is a long strip structure made of a thin metal sheet 711. The first end of the first spring plate 5 is riveted or screwed to the crossbeam 4, and the second end is welded to the main windward portion 21. The first spring plate 5 can produce elastic deformation to have a spring force that drives the main windward portion 21 to rotate towards the air inlet end of the air duct 11.

[0039] The aforementioned airflow adjustment mechanism is connected to the horizontal shaft 3 via a transmission, used to drive the horizontal shaft 3 to rotate to an initial position, and configured to allow the horizontal shaft 3 to rotate back and forth between the initial position and an adjustment position deviating from the initial position. When the horizontal shaft 3 rotates to the initial position, the first blade 2 forms an initial opening angle within the air duct 11 to allow a certain airflow. The aforementioned adjustment position changes dynamically according to the amount of air intake. Specifically, when the air intake changes, under the elastic force of the first spring plate 5, the first blade 2 swings between the initial position and the adjustment position to change the degree of opening and closing of the first blade 2, thereby maintaining a constant airflow within the air duct 11.

[0040] In this embodiment, the aforementioned airflow adjustment mechanism includes a rotating rod 7, a second spring plate 71, a long arm 72, and a locking element. The rotating rod 7 is arranged on the outside of the air duct 11 and at one end of the horizontal axis 3. The rotating rod 7 is arranged in the same direction as the horizontal axis 3. One end of the rotating rod 7 is inserted into a mounting hole and is axially limited so that the rotating rod 7 can rotate relative to the valve body 1 around its own central axis 61. The aforementioned second spring plate 71 is fixedly arranged on the rotating rod 7. The second spring plate 71 is made of metal material and can produce elastic deformation, so as to have a spring end extending towards or away from the horizontal axis 3. The aforementioned long arm 72 is fixedly installed on the horizontal axis 3 and has a free end extending towards or away from the rotating rod 7. The spring end of the second spring plate 71 and the free end of the long arm 72 are linked together. When the rotating rod 7 rotates, the horizontal axis 3 can be rotated by the linkage of the second spring plate 71 and the long arm 72. In the specific structural design, a pull rod 73 is arranged between the second spring 71 and the long arm 72. The first end of the pull rod 73 is hooked to the elastic end of the second spring 71, and the second end is hooked to the free end of the long arm 72. The linkage between the second spring 71 and the long arm 72 is achieved through the coordinated use of the pull rod 73.

[0041] In its specific structural design, the second spring 71 has a fixed end away from the elastic end. The second spring 71 comprises several stacked metal sheets 711. The length of each metal sheet 711 increases sequentially from the fixed end of the second spring 71. The metal sheets 711 are connected by welding or riveting. The fixed end of the second spring 71 is connected to the rotating rod 7. The end of the longest metal sheet 711 away from the fixed end forms the elastic end of the second spring 71. The stacked arrangement of the metal sheets 711 enhances the elastic deformation capability of the second spring 71 and improves its service life.

[0042] The aforementioned locking element is arranged between the valve body 1 and the rotating rod 7, having a locked state that fixes the rotating rod 7 and the valve body 1 relatively, and an unlocked state that allows the rotating rod 7 and the valve body 1 to move relatively. In the locked state, the rotating rod 7 is restricted to its current position, and the initial position of the first blade 2 is maintained by the pull of the second spring 71 and the long arm 72. In the unlocked state, the rotating rod 7 can rotate, thereby driving the horizontal shaft 3 to rotate, so as to adjust the angle of the first blade 2. In a specific structural design, the locking element includes a stud 76 and a locking nut 77. An indicator disc 74 is fixedly mounted on the rotating rod 7 on the outside of the valve body 1. The indicator disc 74 is in contact with the outer wall of the valve body 1. An arc-shaped groove 75 formed with the center of the rotating rod 7 as the center is machined on the indicator disc 74. The stud 76 is fixed to the outer wall of the valve body 1 and passes through the arc-shaped groove 75. The locking nut 77 is threadedly connected to the stud 76. By rotating the locking nut 77, the locking nut 77 can come into contact with the indicator 74, and the indicator 74 is clamped between the outer wall of the valve body 1 and the locking nut 77, thereby causing the rotating rod 7 to form the aforementioned locked state.

[0043] In this embodiment, an arc-shaped scale 13 with the center of the rotating rod 7 as the center is installed on the outer wall of the valve body 1 corresponding to the indicator disk. The arc-shaped scale 13 can reflect the position of the indicator disk 74, and thus indirectly indicate the position of the first blade 2.

[0044] In this embodiment, a second blade 6 is arranged within the air duct 11 on either the inlet or outlet side of the first blade 2. The second blade 6 is adapted to the inner peripheral wall of the air duct 11. A central shaft 61 is mounted on the second blade 6. This central shaft 61 is arranged in the same direction as the horizontal shaft 3, and its two ends are rotatably connected to the valve body 1 via bearings. The second blade 6 rotates around the central shaft 61 to have a normally open position (opening the air duct 11) and a normally closed position (closing the air duct 11). An elastic element is arranged between the central shaft 61 and the valve body 1. This elastic element has a spring force that drives the second blade 6 to move towards the normally closed position. In this embodiment, the elastic element is preferably a torsion spring 63 (preferred technology). In the aforementioned normally open position, a thermoplastic member 62 connects the second blade 6 and the crossbeam 4. The second blade 6 is held in the normally open position by the tension of the thermoplastic member 62. The thermoplastic member 62 is a conventional component of the prior art and can be made of plastic. Alternatively, a heat-melted metal wire (preferred technology) can also be used. In the specific design, the melting temperature of the modified heat-fused component 62 is set to 70℃-150℃.

[0045] In practical use, the torque applied to the horizontal axis 3 by the second spring 71 and the elastic force applied to the main windward portion 21 by the first spring 5 are dynamically balanced to maintain the first blade 2 in its initial position. Airflow enters the air duct 11 through the inlet end, is guided by the guide plate 12, and most of the airflow entering the air duct 11 is directed towards the main windward portion 21 on the first blade 2. It then flows through the gap between the first blade 2 and the air duct 11 and exits from the outlet end of the air duct 11. When the intake air volume changes, the airflow blows towards the main windward portion 21 to exert a force on the first blade 2. Under the elastic force of the first spring 5 and the second spring 71, the angle of the first blade 2 dynamically changes, causing the gap between the first blade 2 and the air duct 11 to dynamically change. Specifically, when the air volume increases, the gap narrows; when the air volume decreases, the gap widens, thereby achieving dynamic adjustment of the air volume and maintaining a constant air volume. The first spring 5 and the second spring 71 are not sensitive to ambient temperature and can adapt to high or low temperature environments. The overall structure has a low failure rate and a long service life, effectively meeting the needs of air volume regulation.

[0046] When the angle of the first blade 2 needs to be adjusted, the locking element is released, causing the indicator dial 74 to rotate. The rotating rod 7 rotates, and under the pull of the second spring 71, the pull rod 73, and the long arm 72, as well as the elastic force of the first spring 5, the horizontal axis 3 and the first blade 2 rotate to an initial position, thereby adjusting the angle of the first blade 2. The indicator dial 74 is locked by the locking element to maintain the first blade 2 in its initial position. The angle of the first blade 2 can be read by pointing the indicator dial 74 to the arc-shaped scale 13. Under the pull of the heat-fused element 62, the second blade 6 remains in the normally open position, allowing airflow to pass through the duct 11 for ventilation. In the event of a fire, the heat-fused element 62 melts upon heating, and under the elastic force of the torsion spring 63, the second blade 6 rotates to the normally closed position, thereby closing the duct 11 to prevent airflow within it and to prevent the fire from spreading.

[0047] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A constant air volume valve, comprising a valve body and an air volume adjustment mechanism; characterized in that: The valve body has an internal air duct; The air duct is provided with a horizontal shaft that is rotatably connected to the valve body; the horizontal shaft is provided with a first blade; the first blade includes a main windward portion and a secondary windward portion arranged on opposite sides of the horizontal shaft; The air duct is provided with a crossbeam fixedly connected to the valve body; a first spring is provided between the crossbeam and the first blade; the first spring has a spring force that drives the main windward part to rotate towards the air inlet end of the air duct. The air duct is equipped with a guide vane to direct airflow toward the main windward section; The airflow adjustment mechanism is connected to the horizontal shaft drive to drive the horizontal shaft to an initial position and is configured to allow the horizontal shaft to rotate back and forth between the initial position and an adjusted position deviating from the initial position.

2. The constant air volume valve according to claim 1, characterized in that: The horizontal axis is eccentrically positioned relative to the first blade; the area of ​​the main windward portion is larger than the area of ​​the secondary windward portion.

3. The constant air volume valve according to claim 1, characterized in that: The airflow adjustment mechanism includes a pull rod; the first end of the pull rod is hooked to the elastic end of the second spring plate, and the second end is hooked to the free end of the long arm.

4. A constant air volume valve according to claim 1, characterized in that: The air volume adjustment mechanism includes a rotating rod, a second spring plate, a long arm, and a locking component; The rotating rod is arranged in the same direction as the horizontal axis and is rotatably connected to the valve body; the second spring is disposed on the rotating rod and has a spring end extending toward or away from the horizontal axis; the long arm is disposed on the horizontal axis and has a free end extending toward or away from the rotating rod; the spring end of the second spring and the free end of the long arm are linked together. The locking element is disposed between the valve body and the rotating rod, and has a locked state that fixes the rotating rod and the valve body relatively, and an unlocked state that allows the rotating rod and the valve body to move relatively.

5. A constant air volume valve according to claim 4, characterized in that: The locking element includes a stud and a locking nut; an indicator disc is provided on the outside of the valve body on the rotating rod; the indicator disc has an arc-shaped groove formed with the center of the rotating rod as the center; the stud is fixed to the outer wall of the valve body and inserted into the arc-shaped groove; the locking nut is threadedly connected to the stud; in the locked state, the indicator disc is clamped between the outer wall of the valve body and the locking nut.

6. A constant air volume valve according to claim 5, characterized in that: The outer wall of the valve body is provided with an arc-shaped scale with the center of the rotating rod as the center of the scale corresponding to the indicator dial.

7. A constant air volume valve according to claim 4, characterized in that: The second spring has a fixed end away from the elastic end; the second spring includes a plurality of stacked metal sheets; the length of each metal sheet increases sequentially from the fixed end of the second spring; the fixed end of the second spring is connected to a rotating rod; wherein the end of the longest metal sheet away from the fixed end forms the elastic end of the second spring.

8. A constant air volume valve according to claim 1, characterized in that: A second blade is provided inside the air duct on the air inlet or air outlet side of the first blade; the second blade is provided with a central shaft rotatably connected to the valve body; the second blade has a normally open position for opening the air duct and a normally closed position for closing the air duct; an elastic element is provided between the central shaft and the valve body; the elastic element has a spring force that drives the second blade to move towards the normally closed position; in the normally open position, a heat-fused element is provided between the second blade and the crossbeam.

9. A constant air volume valve according to claim 8, characterized in that: The melting temperature of the hot melt component is 70℃-150℃.

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