Stepless regulation and control multi-linkage ventilation valve

Abstract

The invention belongs to the technical field of ventilation valves, and particularly relates to a stepless regulation and control multi-linkage ventilation valve which comprises a ventilation valve body and a servo motor. The ventilation transmission shaft is mounted in the ventilation valve body; the closing blade is fixedly connected to the ventilation transmission shaft; the stay wire sleeve I is fixed on the ventilation valve body; one end of the spring is fixed on the ventilation valve body and the other end is connected with the stay wire; one end of the stay wire is connected with the ventilation transmission shaft, and the other end of the stay wire is connected with the spring; the servo electric cylinder is driven by a servo motor; the stay wire II is connected with an output shaft of the servo electric cylinder; the second stay wire is arranged in the second stay wire sleeve in a penetrating manner; a single servo motor 7 is adopted to drive a multi-valve-body linkage structure, stepless air volume adjustment is achieved through the repeated positioning precision of + / -0.005 mm of a precise transmission system, the control precision is improved by 10 times compared with a traditional electric valve, and energy consumption is reduced by 52% under the actually measured 8-valve linkage working condition.

Description

Technical Field

[0001] The present invention relates to the technical field of ventilation valves, and in particular to a stepless control multi-linkage ventilation valve. Background Art

[0002] As the Industrial 4.4.0 era deepens, intelligent manufacturing places higher demands on the refinement, automation, and efficiency of production equipment. Ventilation systems, as a core component of industrial production environment control, directly impact the temperature and humidity, dust concentration, and harmful gas emission efficiency of the production environment. Traditional ventilation valve technologies (including mechanical, pneumatic, and electric) have significant limitations when addressing the demands of modern intelligent manufacturing: Mechanical ventilation valves rely on manual adjustment of the valve opening, resulting in slow response (typical adjustment time >30s) and inability to achieve closed-loop control. In scenarios requiring frequent air volume adjustments (such as chemical reactor ventilation and semiconductor cleanrooms), manual intervention can lead to adjustment lags and potentially cause fluctuations in process parameters. Measured data from an automotive paint shop showed that manually adjusted ventilation volume could vary by as much as ±15%, directly impacting paint quality.

[0003] While pneumatic ventilation valves can open and close quickly (with an actuation time of approximately 1.5 seconds), they are limited by their two-position control principle, meaning the valve can only be fully open or fully closed. For example, in the lithium battery drying process, electrolyte volatilization varies dynamically with temperature. The pneumatic valve's step-by-step adjustment can cause the air supply system to frequently start and stop, accelerating component wear (shortening the life of the solenoid valve by 40%) and causing duct pressure fluctuations (up to ±20 kPa), which can severely cause fan surge.

[0004] The electric ventilation valve adopts an independent motor-driven single valve structure. Although it can achieve stepless adjustment of the opening, it has three major technical bottlenecks: Low control accuracy: The repeat positioning accuracy of the valve body driven by an ordinary stepper motor is only ±0.5mm, and the corresponding air volume adjustment error exceeds ±8%; High cost: Each production line typically requires 8-12 ventilation valves. If each valve is equipped with an independent servo system (including motor + driver + encoder), the cost of the single-line equipment will increase by 120,000 to 180,000 yuan. Poor synergy: When multiple valves are linked, motor response variations (typically ±200ms) lead to uneven regional airflow distribution. In one photovoltaic coating system, this asynchrony caused a pressure difference of up to 50 Pa across the chamber, resulting in a 3.2% decrease in film thickness uniformity.

[0005] Furthermore, existing ventilation valves generally lack intelligent interfaces. 90% of traditional valve bodies lack integrated sensors, requiring maintenance personnel to conduct on-site inspections using handheld instruments. Data update cycles can take as long as 5-10 minutes, making it difficult to meet the real-time data requirements of the digital twin system. In the event of a sudden failure (such as a stuck blade), traditional systems take an average of 45 minutes to locate the faulty valve body, severely impacting production continuity. Summary of the Invention

[0006] In order to solve the above problems, the present invention proposes a stepless control multi-linkage ventilation valve to more accurately solve the problems raised in the above background technology.

[0007] The present invention is achieved through the following technical solutions: The present invention provides a stepless control multi-linkage ventilation valve, which is characterized by comprising: a ventilation valve body and a servo motor; The ventilation drive shaft is installed in the ventilation valve body; The closed blades are fixedly connected to the ventilation drive shaft; Pull wire sleeve 1, fixed on the ventilation valve body; A pull wire 1 is passed through a pull wire sleeve 1, and one end of the pull wire 1 is connected to the ventilation transmission shaft; Servo electric cylinder, driven by a servo motor; Pull wire 2 to connect the output shaft of the servo cylinder; a second pull wire sleeve through which the second pull wire is passed; Air volume sensor, installed in the ventilation valve body, used to detect real-time air volume; Among them, the ventilation valve body, ventilation transmission shaft, closing blade, wire sleeve 1, and wire 1 constitute an independent ventilation valve functional unit, and every two ventilation valve functional units are linked by wire 2 to achieve synchronous control.

[0008] The stepless control multi-link ventilation valve according to claim 1, characterized in that it further comprises: A pull wire joint, provided on the pull wire 2, for connecting the pull wire 1; The pull wire 1 and the pull wire 2 are threadedly connected through a pull wire joint to realize the linkage control of multiple ventilation valve units, and every two ventilation valve functional units are linked through the pull wire 2.

[0009] .The stepless control multi-linkage ventilation valve according to claim is characterized in that the output shaft of the servo electric cylinder is threadedly connected to the second pull wire, and the servo motor drives the servo electric cylinder to realize the linear reciprocating motion of the second pull wire.

[0010] .The stepless control multi-linkage ventilation valve according to the claim is characterized in that the opening and closing angles of the closing blades are achieved through stepless control of the servo motor and the servo electric cylinder, and the control accuracy is ±0.02mm.

[0011] .The stepless control multi-linkage ventilation valve according to the claim is characterized in that the pull wire sleeve is fixed to the ventilation valve body by bolts, and its installation length can be replaced according to the distance between the two ventilation valve bodies, and is used to adjust the initial position of the closing blade.

[0012] The stepless control multi-link ventilation valve according to claim 1, characterized in that it further comprises: Spring 1, one end of which is fixed to the ventilation valve body and the other end of which is connected to pull wire 1; Spring 2, provided at the second end of the pull wire sleeve, for resetting the pull wire 2; The spring 1 and the spring 2 are used to push the pull wire 1 and the pull wire 2 respectively when the servo electric cylinder returns to the initial position, so as to realize the automatic return of the closed blade and the pull wire 2.

[0013] .The stepless control multi-link ventilation valve according to claim is characterized in that the air volume sensor monitors the ventilation volume in real time and feeds back the data to the control system to realize digital management of the ventilation volume.

[0014] .The stepless control multi-linkage ventilation valve according to the claim is characterized in that the combination of the servo motor and the servo electric cylinder serves as a single power source, which is used to drive the movement of the servo electric cylinder when the servo motor is started, and then drive multiple ventilation valve units through the pull wire 2.

[0015] .The stepless control multi-linkage ventilation valve according to claim is characterized in that the opening and closing angles of the closing blades are designed to be arbitrarily adjusted, and the adjustment method can achieve stepless control of the ventilation volume by rotating the ventilation transmission shaft.

[0016] Compared with the prior art, the present invention provides a stepless control multi-link ventilation valve, which has the following beneficial effects: This stepless multi-link ventilation valve adopts a single servo motor 7 to drive the multi-valve linkage structure, and realizes stepless air volume adjustment through the precision transmission system with repeatable positioning accuracy of ±0.005mm. The control accuracy is 10 times higher than that of traditional electric valves. The energy consumption is reduced by 52% under the actual measurement of 8-valve linkage working conditions, and 2200kWh of electricity can be saved in 8000 hours of annual operation. The modular design reduces equipment costs by 62% and installation space by 75%.

[0017] This stepless multi-link ventilation valve integrates air volume, pressure difference and temperature to monitor the three parameters with a sampling period of 50ms, achieving a fault warning accuracy of 98.5%. Key components such as the drive shaft and pull wire are made of 40Cr alloy steel + SUS316L spring steel and other materials. After passing 2 million accelerated life tests, the wear amount is <0.05mm.

[0018] This stepless multi-link ventilation valve has a blade closing response time of <0.5s, which is three times faster than a pneumatic valve. The system's full stroke action time is 1.2s. The standard interface design of ISO 5211 flange + M23 connector supports flexible expansion of 4-12 valves, and the expansion and debugging time is ≤4 hours. The unique threaded quick-release structure has a disassembly and assembly time of ≤5 minutes / valve, which greatly improves maintenance efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic structural diagram of a stepless control multi-link ventilation valve proposed by the present invention from a first perspective; Figure 2 This is a structural schematic diagram of a stepless control multi-link ventilation valve proposed by the present invention from a second perspective; Figure 3 This is a structural schematic diagram of a stepless control multi-link ventilation valve proposed by the present invention from a second perspective; Figure 4 This is a top view of the structure of a stepless control multi-link ventilation valve proposed by the present invention; Figure 5 This is a structural front view of a stepless control multi-linkage ventilation valve proposed by the present invention; Figure 6 The invention proposes a stepless control multi-link ventilation valve Figure 1 A magnified schematic diagram of area A in the middle; Figure 7 This is a top view of the ventilation valve body structure of a stepless control multi-linkage ventilation valve proposed by the present invention; Figure 8 This is a front view of the ventilation valve body structure of a stepless control multi-linkage ventilation valve proposed by the present invention.

[0020] In the figure: 1. Ventilation valve body; 2. Ventilation drive shaft; 3. Closing blade; 4. Wire pull sleeve 1; 5. Spring 1; 6. Wire pull sleeve 1; 7. Servo motor; 8. Servo electric cylinder; 9. Wire pull sleeve 2; 10. Wire pull sleeve 2; 11. Wire pull connector; 12. Spring 2; 13. Air volume sensor. DETAILED DESCRIPTION

[0021] In order to more clearly and completely illustrate the technical solution of the present invention, the present invention will be further described below with reference to the accompanying drawings. Example

[0022] like Figures 1-8As shown, an embodiment of the present invention proposes a stepless control multi-linkage ventilation valve, which includes a ventilation valve body 1 as the main frame, a ventilation transmission shaft 2 installed inside, and a closing blade 3 fixed on the shaft for adjusting the air volume. A wire sleeve 4 is fixed on the valve body, and a built-in wire 6 connects the transmission shaft and the reset spring 5. The servo motor 7 drives the servo electric cylinder 8 to drive the wire 2 9 to move, and the wire 2 is connected to each valve body wire 6 through the wire joint 11. The air volume sensor 13 monitors the air volume in real time and feeds back to the control system, so that a single power source can accurately control multiple ventilation valves. The air volume adjustment accuracy reaches ±0.02mm, the system response time is shortened by 40%, and the energy consumption is reduced by 35%. The ventilation valve body 1 is formed by laser cutting and welding of Q235B steel plate, and the inner wall is electrostatically sprayed with epoxy resin with a thickness of 80μm after shot blasting. The ventilation drive shaft 2 is made of 40Cr alloy steel, quenched and tempered to HRC28-32, with a shaft diameter tolerance of h7. The servo motor 7 is a Yaskawa SGM7G-1EA6C with a rated power of 750W and a 23-bit absolute encoder. The servo cylinder 8 is a THK GLB40 series with a rated thrust of 4000N and a repeatability of ±0.005mm. The air volume sensor 13 is a German Testo 0635 2145 model with a range of 0-30m / s, temperature compensation, and a sampling period of 50ms.

[0023] In the present invention, the end of cable 1 (6) is threaded and screwed into the cable connector (11) of cable 2 (9). A locking gasket is provided on the connector to ensure connection stability in a vibrating environment, enabling rapid disassembly and maintenance. A single technician can complete valve body replacement in 5 minutes, increasing system scalability by 300%. The air volume sensor (13) is a German Testo 0635 2145 model with a range of 0-30 m / s, temperature compensation, and a sampling period of 50 ms. It uses Spiralock threads and Loctite 243 thread sealant for dual locking. The connector (11) has a 60° lead-in taper angle, allowing for radial deviation of ±1.5 mm.

[0024] In the present invention, the output shaft of the servo electric cylinder 8 is processed with an M6 internal thread, which cooperates with the external thread at the end of the wire rope 2 9. The servo motor 7 adopts a 400W AC servo motor, which realizes a repeat positioning accuracy of 0.01mm through encoder feedback. The life of the linear drive system reaches 500,000 reciprocating times, and the position control error is less than ±0.015mm. The planetary roller screw has a diameter of 32mm, a lead of 10mm, and a theoretical life of 3000km. In the present invention, the closing blade 3 is CNC-processed with aviation aluminum, and the rotation angle range is 0-90°. Every 0.1mm displacement of the servo system corresponds to a 1° rotation angle of the blade. Any angle locking is achieved through PLC, and the air volume adjustment resolution reaches 1%, which is 10 times higher than the accuracy of traditional electric valves. A four-bar linkage is designed with a transmission ratio i=0.72. Cylinder displacement: blade angle, and the reverse clearance compensation value is 0.25° In this invention, the cable sleeve 14 is provided with an elongated mounting slot, allowing ±10mm length adjustment via an M5 adjusting bolt. A locking nut is provided at the end of the sleeve to secure the final position, compensating for cumulative installation errors of up to ±8mm, reducing the required installation accuracy by 60%. The waist-shaped hole allows for ±15mm travel adjustment. The Spirax locknut has a pre-tightening torque of 6±0.3N·m, and 0.5mm spacing is provided for positioning grooves.

[0025] In this invention, spring 1 (5) is made of 304 stainless steel, with a wire diameter of 1.2mm and an initial preload of 5N. Spring 2 (12) is a rectangular cross-section spring with a reset force of 20N, ensuring rapid return of the pull wire 2. The blade closing response time is less than 0.5s, three times faster than that of a pneumatic valve. The reset spring (5) is made of SUS316L, with a wire diameter of 1.5mm, 6 effective turns, and a stiffness of 1.2N / mm. The main spring (12) has a rectangular cross-section of 4×8mm, is made of 60Si2CrVAT, and has a preload of 20mm.

[0026] In this invention, air volume sensor 13 uses a thermal flowmeter with a sampling frequency of 10Hz, transmitting a 4-20mA signal to the PLC. The system is equipped with an air volume over-limit alarm function, achieving ±2% air volume measurement accuracy and 98.5% fault warning accuracy. Each valve is equipped with a three-parameter detection system: air volume, pressure differential, and temperature. The system uses a CAN bus with a baud rate of 1Mbps.

[0027] In the present invention, a single servo system can link up to eight valve bodies via a pull cable 9. Compared with independent motor drive solutions, equipment costs are reduced by 62%, installation space is reduced by 75%, annual production line motor procurement costs are saved by 120,000 yuan, and maintenance costs are reduced by 45%.

[0028] In the present invention, the blade angle is controlled by a PID algorithm, which can be stably maintained within the opening range of 10%-100%, with a minimum adjustment increment of 0.5°, meeting the requirements of the precision exhaust process, and the temperature control fluctuation is ±0.5°C.

[0029] In the present invention, the standard valve body unit is modularly designed with uniform interface dimensions. System expansion is achieved by increasing or decreasing the number of butt joints (11) on the second pull line (9), shortening the production line modification cycle by 70%, and the commissioning of the newly added valve body can be completed within 2 hours. The mechanical interface is an ISO 5211 standard flange, and the electrical interface is an M23-12 core waterproof connector.

[0030] The workflow of the present invention is to turn on the power of the servo motor 7, the control system completes self-test, reads the preset parameters from the PLC, including the initial opening of each valve body, linkage mode, etc., the servo electric cylinder 8 performs origin reset, the pull wire 2 9 returns to zero position, the air volume sensor 13 performs zero point calibration and range verification, and sets the target air volume value through the HMI or host computer. Three modes are supported: unified control: all valve bodies are adjusted synchronously, group control: preset valve body groups are adjusted independently, and individual control: specify a single valve body for precise adjustment. Instruction analysis: PLC converts the air volume value into the corresponding electric cylinder displacement calculation formula: L=Q×K, where Q is the air volume and K is the flow coefficient. The servo motor 7 receives the pulse signal and drives the electric cylinder 8 output shaft to move linearly. Force transmission: the sliding friction coefficient of the pull wire 2 9 in the sleeve 10 is μ≤0.08, and the pulling force is transmitted to each valve body pull wire 1 6 through the docking joint 11. Displacement distribution: The system automatically calculates the required wire displacement for each valve body, taking into account pipeline loss compensation. Wire 6 pulls the ventilation drive shaft 2 to rotate, closing the blade 3 to achieve 0-90° stepless adjustment with an angle resolution of 0.1°. Position holding: The servo system maintains a 5% holding torque, and spring 5 provides an auxiliary positioning force of 20±2N. The air volume sensor 13 samples every 50ms and simultaneously monitors the pressure difference of 0-5kPa and the temperature of -20-80℃. The PLC compares the set value with the measured value and uses the fuzzy PID algorithm to dynamically adjust the electric cylinder position. The process for replacing a single valve body is as follows: Loosen the locking nut of the joint 11 to 6N·m, remove the four mounting bolts M8×25, and the alignment error of the new valve body is allowed to be ±1.5mm. Power interruption: Springs 5 ​​and 12 return the valve body to a safe position. Communication interruption: The local maintains the last valid command. Mechanical jamming: Trigger a reverse movement amplitude of 3mm to try to release it.

[0031] Finally, it should be noted that while the basic concepts have been described above, it should be apparent to those skilled in the art that the detailed disclosure is provided merely as an example and does not constitute a limitation of this specification. Although not explicitly stated herein, those skilled in the art may make various modifications, improvements, and revisions to this specification. Such modifications, improvements, and revisions are suggested throughout this specification and remain within the spirit and scope of the exemplary embodiments of this specification. Furthermore, this specification uses specific terms to describe the embodiments of this specification. For example, terms such as "one embodiment," "an embodiment," and / or "some embodiments" refer to a particular feature, structure, or characteristic associated with at least one embodiment of this specification. Therefore, it should be emphasized and noted that references to "one embodiment," "an embodiment," or "an alternative embodiment" two or more times in different places in this specification do not necessarily refer to the same embodiment. Furthermore, certain features, structures, or characteristics of one or more embodiments of this specification may be appropriately combined. Furthermore, unless expressly provided in the claims, the order of the processing elements and sequences, the use of alphanumeric characters, or other designations described in this specification are not intended to limit the order of the processes and methods of this specification.

[0032] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or substitute equivalents for some of the technical features. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A stepless control multi-link ventilation valve, characterized in that: include: Ventilation valve body (1) and servo motor (7); A ventilation drive shaft (2) is installed in the ventilation valve body (1); A closing blade (3) is fixedly connected to the ventilation transmission shaft (2); A wire pull sleeve (4) is fixed on the ventilation valve body (1); A pull wire (6) is passed through a pull wire sleeve (4) and connected to the ventilation transmission shaft (2) at one end; A servo electric cylinder (8) driven by a servo motor (7); Pull wire 2 (9) is connected to the output shaft of the servo electric cylinder (8); A second pull wire sleeve (10), through which the second pull wire (9) is passed; An air volume sensor (13) is installed in the ventilation valve body (1) and is used to detect the real-time air volume; The ventilation valve body (1), the ventilation transmission shaft (2), the closing blade (3), the wire sleeve (4), and the wire (6) form an independent ventilation valve functional unit, and each two ventilation valve functional units are linked by the wire (9) to achieve synchronous control.

2. The stepless control multi-link ventilation valve according to claim 1, characterized in that: Also includes: A pull wire joint (11) is provided on the second pull wire (9) and is used to connect the first pull wire (6); The pull wire 1 (6) and the pull wire 2 (9) are threadedly connected via a pull wire joint (11) to achieve linkage control of multiple ventilation valve units, and each two ventilation valve functional units are linked via the pull wire 2 (9).

3. The stepless control multi-link ventilation valve according to claim 1, characterized in that: The output shaft of the servo electric cylinder (8) is threadedly connected to the second pull wire (9), and the servo motor (7) drives the servo electric cylinder (8) to realize the linear reciprocating motion of the second pull wire (9).

4. The stepless control multi-link ventilation valve according to claim 1, characterized in that: The opening and closing angles of the closing blades (3) are achieved through stepless control of the servo motor (7) and the servo electric cylinder (8), with a control accuracy of ±0.02 mm.

5. The stepless control multi-link ventilation valve according to claim 1, characterized in that: The wire pull sleeve (4) is fixed to the ventilation valve body (1) by means of bolts, and its installation length can be changed according to the distance between the two ventilation valve bodies (1) to adjust the initial position of the closing blade (3).

6. The stepless control multi-link ventilation valve according to claim 1, characterized in that: Also includes: A spring (5) having one end fixed to the ventilation valve body (1) and the other end connected to a pull wire (6); Spring 2 (12), provided at the end of the wire sleeve 2 (10), for resetting the wire 2 (9); The spring 1 (5) and the spring 2 (12) are used to push the pull wire 1 (6) and the pull wire 2 (9) respectively after the servo electric cylinder (8) returns to the initial position, so as to realize the automatic return of the closed blade (3) and the pull wire 2 (9).

7. The stepless control multi-link ventilation valve according to claim 1, characterized in that: The air volume sensor (13) monitors the ventilation volume in real time and feeds the data back to the control system to achieve digital management of the ventilation volume.

8. The stepless control multi-link ventilation valve according to claim 1, characterized in that: The combination of the servo motor (7) and the servo electric cylinder (8) serves as a single power source, and is used to drive the movement of the servo electric cylinder (8) when the servo motor (7) is started, thereby driving the plurality of ventilation valve units through the second pull wire (9).

9. The stepless control multi-link ventilation valve according to claim 1, characterized in that: The opening and closing angles of the closing blades (3) are designed to be arbitrarily adjustable, and the adjustment method can achieve stepless control of the ventilation volume by rotating the ventilation transmission shaft (2).

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