A constant air volume ventilation control device with precise ventilation volume control

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By introducing a hinged seat, a secondary counterweight, and a spring into the constant air volume valve, and by adjusting the valve plate according to changes in air pressure, the problems of slow response speed and low control accuracy are solved, achieving precise air volume control and reduced energy consumption.

CN224580419UActive Publication Date: 2026-07-31ZHEJIANG SHUANGYANG FAN CO LTD

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Patent Information

Authority / Receiving Office: CN · China
Patent Type: Utility models(China)
Current Assignee / Owner: ZHEJIANG SHUANGYANG FAN CO LTD
Filing Date: 2025-07-10
Publication Date: 2026-07-31

AI Technical Summary

Technical Problem

Existing constant air volume valves have slow response speeds and are difficult to adapt to complex operating conditions, resulting in low air volume control accuracy and high energy consumption.

Method used

A constant air volume ventilation control device with precise ventilation volume control was designed. By setting up a hinged seat, a secondary counterweight, a groove, a main counterweight, a connecting rod, a spring, and a limiting component, the counterweight is slid by the change in wind pressure, so as to realize the flexible adjustment of the valve plate. Combined with the buffer of the spring and the ball bearing to reduce friction, the air volume is synergistically adjusted.

Benefits of technology

It achieves precise airflow control under complex operating conditions, improves response speed and adjustment accuracy, and reduces energy consumption.

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Abstract

This utility model relates to the technical field of constant air volume equipment, specifically a constant air volume ventilation control device for precise ventilation volume control. It includes an air duct, an internal valve plate, a rotating rod penetrating the center of the valve plate, a hinge seat on one side of the valve plate, a connecting rod connected to the hinge seat, a groove on the connecting rod, a secondary counterweight outside the groove, a first spring at the bottom of the secondary counterweight, a main counterweight at the end of the connecting rod away from the hinge seat, and a limiting component at the bottom of the main counterweight. By utilizing the structure of the hinge seat, secondary counterweight, groove, main counterweight, connecting rod, first spring, limiting component, fixed cylinder, slide groove, slider, and second spring, the problem of existing constant air volume valves, which can maintain a basic air volume but have a slow response speed and are difficult to adapt to complex working conditions is solved.

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Description

Technical Field

[0001] This utility model relates to the field of constant air volume equipment technology, specifically a constant air volume ventilation control device with precise ventilation volume control. Background Technology

[0002] A constant air volume (CAV) valve is a mechanical, self-regulating device suitable for ventilation systems requiring a constant air volume. CAV valves control airflow without external power; they rely on the airflow force within the duct to position the control valve, thus maintaining the airflow at a preset rate across the entire pressure differential range. Traditional ventilation systems often experience airflow fluctuations due to changes in duct pressure, requiring frequent manual adjustment of valves or fan speeds, resulting in low control accuracy and high energy consumption.

[0003] Existing constant air volume valves can maintain basic air volume, but their response speed is slow and they are difficult to adapt to complex operating conditions.

[0004] Therefore, it is particularly important to design a constant air volume ventilation control device with precise ventilation volume control to overcome the above-mentioned technical defects and improve overall practicality. Utility Model Content

[0005] The purpose of this invention is to provide a constant air volume ventilation control device with precise ventilation volume control, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: A constant air volume ventilation control device with precise ventilation volume control includes an air duct, a valve plate inside the air duct, a rotating rod passing through the center of the valve plate, a hinge seat on one side of the valve plate, a connecting rod connected to the hinge seat, a groove on the connecting rod, a secondary counterweight outside the groove, a first spring at the bottom of the secondary counterweight, a main counterweight at the end of the connecting rod away from the hinge seat, and a limiting component at the bottom of the main counterweight. The limiting component includes a fixed cylinder with a groove inside, a slider on the main counterweight, and a second spring at the bottom of the main counterweight.

[0007] As a preferred embodiment of this utility model, the secondary counterweight is hollow, and the groove and the secondary counterweight are provided with a number of slots along their length. The slots are provided with ball bearings to reduce the sliding friction between the secondary counterweight and the connecting rod.

[0008] As a preferred embodiment of this utility model, the stiffness coefficient ratio of the first spring to the second spring is 1:2-1:3, and the pre-compression length of the first spring is 10%-15% of the total length. The mass ratio of the main counterweight to the secondary counterweight is 5:1-3:1, and the sliding stroke of the secondary counterweight accounts for 1 / 4-1 / 3 of the total length of the connecting rod.

[0009] As a preferred embodiment of this utility model, a limiting plate is provided at one end of the groove near the main counterweight, and one end of the first spring is fixedly connected to the limiting plate.

[0010] As a preferred embodiment of this utility model, the main counterweight is hollow, and the diameter of the hollow part is adapted to one end of the connecting rod. The end of the connecting rod near the main counterweight is provided with a threaded groove, and a T-shaped threaded rod is provided inside the threaded groove. The T-shaped threaded rod completely covers the hollow diameter, and the T-shaped threaded rod is connected to one end of the second spring.

[0011] As a preferred embodiment of this utility model, the outer side of the air duct is provided with a scale for indicating the sliding position of the secondary counterweight and the main counterweight, and the two ends of the rotating rod are connected to the air duct through bearing seats.

[0012] Compared with the prior art, the beneficial effects of this utility model are: 1. This utility model provides a constant air volume ventilation control device with precise ventilation volume control. Utilizing a structure consisting of a hinged seat, a secondary counterweight, a groove, a main counterweight, a connecting rod, a first spring, a limiting component, a fixed cylinder, a sliding groove, a slider, and a second spring, the rotating rod is securely connected to the duct via bearing seats, ensuring flexible rotation and laying the foundation for valve adjustment. During ventilation, changes in air pressure within the duct cause pressure on the valve plate, which is transmitted through the connecting rod, causing the secondary counterweight to slide down the groove. Its gravitational torque interacts with the air pressure torque, while the ball bearings reduce friction and aid response. The first spring buffers and prevents excessive sliding, thereby rotating the valve plate to adjust the ventilation volume. Under high air pressure, the secondary counterweight reaches its limit, and the main counterweight slides within the fixed cylinder under its own weight and the action of the second spring, working in conjunction with the secondary counterweight to counteract the air pressure torque, achieving constant air volume control. This solves the problem of existing constant air volume valves, which, while maintaining basic air volume, have slow response speeds and are difficult to adapt to complex working conditions. Attached Figure Description

[0013] Figure 1 This is a plan view of the overall structure of this utility model; Figure 2 This is a schematic diagram of the constant air volume ventilation control component of this utility model; Figure 3 This is a schematic diagram of the working of the auxiliary counterweight block under small air volume fluctuations in this utility model.

[0014] In the diagram: 1. Air duct; 101. Valve plate; 102. Rotating rod; 2. Hinge seat; 201. Secondary counterweight; 202. Groove; 203. Main counterweight; 204. Connecting rod; 205. First spring; 3. Limiting assembly; 301. Fixed cylinder; 302. Slide groove; 303. Sliding block; 304. Second spring. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0016] To facilitate understanding of this utility model, a more comprehensive description will be given below with reference to the accompanying drawings. Several embodiments of this utility model are provided. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this utility model will be more thorough and complete.

[0017] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0018] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0019] For examples, please refer to Figure 1-3 This utility model provides a technical solution: A constant air volume ventilation control device with precise ventilation volume control includes an air duct 1. A valve plate 101 is installed inside the air duct 1. A rotating rod 102 passes through the center of the valve plate 101. A hinge seat 2 is provided on one side of the valve plate 101, connecting to a connecting rod 204. A groove 202 is provided on the connecting rod 204, and a secondary counterweight 201 is provided outside the groove 202. A first spring 205 is provided at the bottom end of the secondary counterweight 201. A main counterweight 203 is provided at the end of the connecting rod 204 away from the hinge seat 2. A limiting component 3 is provided at the bottom end of the main counterweight 203. The limiting component 3 includes a fixed cylinder 301, with a sliding groove 302 inside the fixed cylinder 301. A slider 303 is provided on the main counterweight 203. The bottom of the counterweight 203 is equipped with a second spring 304. By connecting the two ends of the rotating rod 102 to the air duct 1 through the bearing seat, it is ensured that the rod rotates flexibly, providing a basis for the adjustment of the valve plate 101. During the operation of the ventilation system, the air pressure in the air duct 1 changes. When the small air pressure acts on the valve plate 101, the pressure is transmitted through the connecting rod 204, causing it to rotate. The secondary counterweight 201 slides down along the groove 202 due to its own weight and the rotation of the connecting rod. Its gravitational torque interacts with the air pressure torque. The ball bearings in the groove 202 and the slot of the secondary counterweight 201 reduce sliding friction, so that the secondary counterweight 201 can respond to torque changes in a timely and accurate manner. The first spring 205 provides resistance to prevent it from sliding excessively, playing a role in buffering and stabilizing adjustment. The auxiliary counterweight 201 slides through the connecting rod 204 and the hinge seat 2 to drive the valve plate 101 to rotate around the rotating rod 102, changing its opening and closing angle, thereby adjusting the ventilation volume. When a large wind pressure wave acts on the valve plate 101, the auxiliary counterweight 201 reaches its limit. At this time, the main counterweight 203, under its own weight and the action of the second spring 304, slides in the fixed cylinder 301 through the slider 303 in the slide groove 302. Its gravitational torque and the gravitational torque of the auxiliary counterweight 201 work together to resist the wind pressure torque, ensuring that the ventilation volume is stable at the set value, and realizing constant air volume control.

[0020] The secondary counterweight 201 is hollow, and the groove 202 and the secondary counterweight 201 have several slots along their length. Ball bearings are installed inside the slots to reduce sliding friction between the secondary counterweight 201 and the connecting rod 204. The hollow design reduces the weight of the secondary counterweight 201, and the slotted and ball bearing design reduces sliding friction between the secondary counterweight 201 and the connecting rod 204, improving adjustment sensitivity and accuracy. Specifically, the stiffness coefficient ratio of the first spring 205 to the second spring 304 is 1:2-1:3, and the pre-compression length of the first spring 205 is 10%-15% of the total length. The mass ratio of the main counterweight 203 to the secondary counterweight 201 is 5:1-3:1, and the sliding stroke of the secondary counterweight 201 accounts for 1 / 4-1 / 3 of the total length of the connecting rod 204. By optimizing the spring stiffness coefficient ratio, pre-compression length, counterweight mass ratio, and sliding stroke, the coordinated adjustment of the main counterweight 203 and the secondary counterweight 201 is achieved, improving the accuracy and stability of ventilation volume control. Furthermore, a limiting plate is provided at one end of the groove 202 near the main counterweight 203, and one end of the first spring 205 is fixedly connected to the limiting plate. The limiting plate prevents the secondary counterweight 201 from moving excessively, and the fixed connection between the first spring 205 and the limiting plate ensures the stable transmission of the spring force, improving the reliability of the device. Furthermore, the main counterweight 203 is hollow, and its hollow diameter matches one end of the connecting rod 204. The end of the connecting rod 204 near the main counterweight 203 has a threaded groove, and a T-shaped threaded rod is located inside the groove. The T-shaped threaded rod completely covers the hollow diameter and connects to one end of the second spring 304. The hollow design reduces the weight of the main counterweight 203, and the design of the threaded groove and T-shaped threaded rod facilitates the replacement of different main counterweights 203, improving the flexibility and maintainability of the device. Preferably, the outer side of the air duct 1 is provided with a scale to indicate the sliding position of the auxiliary counterweight 201 and the main counterweight 203. The scale makes it easy for users to intuitively understand the sliding position of the counterweight, thereby judging the ventilation volume adjustment status and improving the operability and convenience of the device. The two ends of the rotating rod 102 are connected to the air duct 1 through bearing seats.

[0021] The working process of this utility model is as follows: When using this constant air volume ventilation control device with precise ventilation volume control, firstly, the two ends of the rotating rod 102 are securely connected to the air duct 1 through bearing seats to ensure that the rotating rod 102 can rotate flexibly, providing a basis for the subsequent adjustment action of the valve plate 101. During the operation of the ventilation system, the air pressure in the air duct 1 changes. When a small amount of wind pressure acts on the valve plate 101, the valve plate 101 experiences downward pressure. This pressure is transmitted through the connecting rod 204, causing the connecting rod 204 to tend to rotate. At this time, due to its own weight and the rotation of the connecting rod 204 caused by the wind pressure on the valve plate 101, the auxiliary counterweight 201 will slide downward along the groove 202. The weight of the auxiliary counterweight 201 generates a gravitational torque, which interacts with the torque generated by the wind pressure on the valve plate 101. The setting of the ball bearings in the groove 202 and the slot on the auxiliary counterweight 201 greatly reduces the friction between the auxiliary counterweight 201 and the connecting rod 204. The sliding friction between the four components allows the secondary counterweight 201 to slide more smoothly, thus responding more promptly and accurately to torque changes caused by wind pressure variations. Simultaneously, the first spring 205 provides resistance to prevent excessive sliding of the secondary counterweight 201 due to wind pressure fluctuations, playing a buffering and stabilizing role. The sliding of the secondary counterweight 201 drives the valve plate 101 to rotate around the rotating rod 102 via the connecting rod 204 and the hinge seat 2, thereby changing the opening and closing angle of the valve plate 101. This change in the opening and closing angle directly affects the ventilation cross-sectional area within the duct 1, thereby regulating the ventilation volume. Meanwhile, when a large wind pressure wave acts on valve plate 101, the secondary counterweight 201 reaches its limit. At this time, the main counterweight 203, under its own weight and the action of the second spring 304, slides in the groove 302 within the fixed cylinder 301 via slider 303. The main counterweight 203 also generates a gravitational torque, which works in conjunction with the gravitational torque of the secondary counterweight 201 to counteract the torque generated by the wind pressure on valve plate 101. Through this coordinated adjustment mechanism, the ventilation volume is ensured to remain stable at the set value, achieving constant air volume control. Users can intuitively understand the sliding positions of the secondary counterweight 201 and the main counterweight 203 through the scale on the outside of the duct 1. Since the position of the counterweight is related to the ventilation volume adjustment state, users can determine the current ventilation volume adjustment state based on the indication of the scale. If the ventilation volume needs to be adjusted, the main counterweight 203 of different weights can be replaced through the threaded slot and T-shaped threaded rod. The main counterweight 203 of different weights will generate different gravitational torques, thereby changing the balance relationship with the wind pressure torque, and causing the opening and closing angle of the valve plate 101 to change, so as to adapt to different ventilation needs and improve the flexibility and maintainability of the device.

[0022] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A constant air volume ventilation control device with precise ventilation volume control, comprising a duct (1), characterized in that: The duct (1) is provided with a valve plate (101) inside. A rotating rod (102) is provided through the center of the valve plate (101). A hinge seat (2) is provided on one side of the valve plate (101). The hinge seat (2) is connected to a connecting rod (204). A groove (202) is provided on the connecting rod (204). A secondary counterweight (201) is provided outside the groove (202). A first spring (205) is provided at the bottom end of the secondary counterweight (201). A main counterweight (203) is provided at the end of the connecting rod (204) away from the hinge seat (2). A limiting component (3) is provided at the bottom end of the main counterweight (203). The limiting component (3) includes a fixed cylinder (301), the inside of which is provided with a sliding groove (302), a slider (303) on the main counterweight (203), and a second spring (304) at the bottom of the main counterweight (203).

2. The constant air volume ventilation control device with precise ventilation volume control according to claim 1, characterized in that: The secondary counterweight (201) is hollow, and the groove (202) and the secondary counterweight (201) are provided with several slots along their length. The slots are provided with ball bearings to reduce the sliding friction between the secondary counterweight (201) and the connecting rod (204).

3. The constant air volume ventilation control device with precise ventilation volume control according to claim 1, characterized in that: The stiffness coefficient ratio of the first spring (205) to the second spring (304) is 1:2-1:3, and the pre-compression length of the first spring (205) is 10%-15% of the total length. The mass ratio of the main counterweight (203) to the secondary counterweight (201) is 5:1-3:1, and the sliding stroke of the secondary counterweight (201) accounts for 1 / 4-1 / 3 of the total length of the connecting rod (204).

4. The constant volume ventilation control device with precise ventilation volume control according to claim 1, characterized in that: The groove (202) is provided with a limiting plate at one end near the main counterweight (203), and one end of the first spring (205) is fixedly connected to the limiting plate.

5. The constant volume ventilation control device with precise ventilation volume control according to claim 1, characterized in that: The main counterweight (203) is hollow, and the diameter of the hollow part is adapted to one end of the connecting rod (204). The connecting rod (204) has a threaded groove inside the end near the main counterweight (203), and a T-shaped threaded rod is provided inside the threaded groove. The T-shaped threaded rod completely covers the hollow diameter, and the T-shaped threaded rod is connected to one end of the second spring (304).

6. The constant volume ventilation control device with precise ventilation volume control according to claim 1, characterized in that: The outer side of the air duct (1) is provided with a scale for indicating the sliding position of the secondary counterweight (201) and the main counterweight (203). The two ends of the rotating rod (102) are connected to the air duct (1) through bearing seats.