wind pressure control system

Abstract

This utility model relates to a wind pressure control system (S), comprising: a central pulley (1); a first fan (P1), a second fan (P2), and a third fan (P3) for providing wind pressure, wherein the fans (P1, P2, P3) are connected in parallel and then connected to the central pulley (1) via a duct circuit (2); a first manual valve (V1) connected in series with the first fan (P1) and a second manual valve (V2) connected in series with the second fan (P2); a pressure measuring sensor (3) for measuring actual wind pressure, wherein the pressure measuring sensor (3) is electrically connected to the central pulley (1) via the duct circuit (2); and a pneumatic regulating device (4) for controlling air leakage, wherein the pneumatic regulating device (4) is connected to the central pulley (1) via the duct circuit (2). The above-mentioned wind pressure control system can improve control accuracy and stability without large-scale modification, and can effectively solve the defects and deficiencies existing in the prior art.

Description

Technical Field

[0001] This utility model relates to a wind pressure control system. Background Technology

[0002] The center roller (also known as the center roll) is a key roller component in industrial equipment used in papermaking, textiles, and printing. Its structure typically consists of a roller body, bearing housing, shaft, and lubrication system. It is mainly used to support, convey, or process materials (such as paper and fabric). Under high-speed operating conditions (linear speeds typically reaching 10 to 30 m / s), the stability and wear resistance of the center roller directly affect product quality and equipment lifespan.

[0003] From a functional perspective, center rollers typically require lubrication protection and oil mist circulation. According to ISO 3448 standards, ISO VG32 or VG46 grade circulating lubricating oil is generally selected. Specifically, the center roller needs a continuous oil supply to reduce frictional losses. The oil supply pressure is usually maintained within the range of 0.1 to 0.3 MPa. The lubricating oil is dispersed into the roller body by airflow (the atomized particle diameter is controlled between 5-20 μm), and then recycled through a built-in spiral return channel to form a circulation. The circulation cycle generally does not exceed 30 minutes to avoid oil accumulation or leakage (leakage must be controlled to less than 5 mL / h).

[0004] To maintain the circulation and protective function of the lubricating oil, a stable air pressure system is usually required inside the center roller. Figure 1 This is a simplified structural diagram of a traditional wind pressure control system S. (For example...) Figure 1 As shown, the air pressure control system S includes: a central pulley 1; a first fan P1, a second fan P2, and a third fan P3 that provide air pressure, which are connected in parallel and then connected to the central pulley 1 via a duct circuit 2; a first manual valve V1 connected in series with the first fan P1 and a second manual valve V2 connected in series with the second fan P2; and a pressure measuring sensor 3 and an electric actuator 4' that are also electrically connected to the central pulley 1 via the duct circuit 2. The pressure measuring sensor 3 is used to measure the actual air pressure, and the electric actuator 4' is used to control the amount of air leakage.

[0005] The aforementioned air pressure control system S provides a fixed air pressure through at least one fan, P1, P2, and P3. Generally, starting one or two of the fans P1, P2, and P3 is sufficient to provide a fixed air pressure, while the remaining fans can be used as backups. The system uses manual valves V1 and V2 to switch, and pressure sensor 3 to measure the actual air pressure. The airflow leakage is then adjusted via electric actuator 4' to stabilize the air pressure within the central pulley 1.

[0006] However, this traditional air pressure control system, especially the electric actuator that controls the required air pressure inside the roller by adjusting the amount of air leakage, has the following problems in actual operation:

[0007] (1) Wind pressure stability directly affects lubrication effect:

[0008] Insufficient pressure prevents the oil mist from effectively covering the roller surface, leading to accelerated wear on the center roller. Excessive pressure causes the oil mist to be excessively dispersed, resulting in environmental pollution and / or lubricant waste. Furthermore, process variations (such as speed adjustments and changes in material thickness) can cause pressure fluctuations within the roller, necessitating dynamic adjustment of the air pressure. However, electric actuators cannot meet these requirements.

[0009] (2) Insufficient accuracy and poor stability:

[0010] Due to aging system equipment, low control precision, and frequent air pressure fluctuations, it is difficult to meet the requirements of actual processes. This instability not only affects lubrication performance but may also cause the water pump unit to trip or even damage the equipment, increasing production risks.

[0011] (3) High upgrade costs:

[0012] A complete system upgrade would not only require a huge investment and take a long time, but could also affect production continuity and place a significant burden on business operations.

[0013] (4) Difficult maintenance and low reliability of spare parts:

[0014] The existing equipment is outdated, maintenance costs are high, and the safety and reliability of spare parts are difficult to guarantee, which further exacerbates the operational risks of the system.

[0015] (5) Lack of emergency response plan:

[0016] When the system malfunctions or controls fail, the lack of effective emergency response measures may lead to production interruptions or equipment damage, affecting overall production efficiency.

[0017] In summary, existing wind pressure control systems have significant shortcomings in terms of stability, economy, maintainability, and emergency response capabilities. There is an urgent need for an optimized solution that can improve control accuracy and stability without requiring large-scale modifications. Therefore, developing a low-cost, highly reliable wind pressure control system with emergency response capabilities is of significant practical importance. Utility Model Content

[0018] The purpose of this invention is to provide a wind pressure control system that can improve control accuracy and stability without requiring large-scale modifications.

[0019] According to a first aspect of this utility model, there is a wind pressure control system, comprising:

[0020] Central wheel;

[0021] The first, second, and third fans provide air pressure. These fans are connected in parallel to each other and then connected to the central roller through the air duct circuit.

[0022] The first manual valve connected in series with the first fan and the second manual valve connected in series with the second fan;

[0023] A pressure sensor that measures actual wind pressure, which is electrically communicated to the central pulley via a duct loop; and

[0024] A pneumatic regulating device for controlling airflow leakage, which is connected to the central roller via a duct circuit.

[0025] In this invention, replacing the traditionally used electric actuator with a pneumatic regulating device yields several advantages:

[0026] (i) Improved dynamic response performance

[0027] The response time of pneumatic control devices is typically 50-150ms, while the response time of traditional electric actuators is typically 80-200ms. In comparison, pneumatic control devices improve the response time by about 30-50ms, making them particularly suitable for process scenarios that require rapid adjustment (such as chemical process control, emergency shut-off, etc.).

[0028] (ii) Higher safety and reliability

[0029] Intrinsically safe and explosion-proof (no electrical components required)

[0030] The pneumatic regulating device can automatically reset to a safe position in case of failure, making it suitable for special working environments such as flammable and explosive environments.

[0031] (iii) Reduced maintenance costs

[0032] Pneumatic regulating devices have a simple mechanical structure, a failure rate that is 40-60% lower than that of electric actuators, a maintenance cycle that is 2-3 times longer (typical maintenance cycle can reach more than 5 years), and spare parts costs that are more than 30% lower.

[0033] (iv) Energy-saving benefits

[0034] Pneumatic control devices do not require a continuous power supply and only consume compressed air when switching states, saving 15-25% more energy than electric actuators.

[0035] (v) Adaptability to special working conditions

[0036] Pneumatic regulating devices have excellent high-temperature resistance (typically above 200℃), and not only do they have better vibration resistance than electric actuators, but they can also work stably in harsh environments such as humidity and dust.

[0037] In a preferred embodiment of the present invention, the wind pressure control system may further include a manual proportional switch device that ensures the minimum wind pressure of the center roller, the manual proportional switch device being electrically communicated to the center roller via the duct circuit.

[0038] In the preferred embodiment described above, a manual proportional switch can be used to manually maintain the minimum air pressure of the center roller, thereby reducing the risk of unplanned downtime. Because the manual proportional switch provides mechanical proportional adjustment, its control over air pressure is more stable (in fault mode, air pressure typically fluctuates within ±5%), thus achieving more satisfactory results compared to relying solely on pneumatic regulators to adjust air pressure.

[0039] Preferably, the minimum air pressure of the central roller can be 70 to 80% of the set value. The set value for stable air pressure is typically set at 110 mbar. That is, the minimum air pressure of the central roller can be 77 to 88 mbar. Of course, the set values ​​and the range of minimum air pressure can be changed according to actual conditions, as long as it does not adversely affect the stable operation of the air pressure control system.

[0040] In another preferred embodiment of this utility model, the pneumatic regulating device may be equipped with a third manual valve. This third manual valve can shut down the pneumatic regulating device when it malfunctions or when one or more fans malfunction and require switching. Based on a manual proportional switch, it maintains the minimum air pressure of the central roller, ensuring the safety of the entire equipment, reducing the possibility of downtime, and providing sufficient time for maintenance personnel to respond quickly.

[0041] In another preferred embodiment of the present invention, the pneumatic regulating device may include: a valve through which a duct circuit passes; a cylinder that drives the valve to operate and adjust the valve opening; and a positioner that adjusts the operation of the cylinder.

[0042] Preferably, the positioner can be associated with the cylinder via a first link, and the cylinder can be associated with the valve via a second link.

[0043] A pneumatic regulating device consisting of a valve, a cylinder, and a positioner can precisely control the valve actuator and convert the control system signal into the cylinder action, thereby achieving precise valve positioning.

[0044] Even better, the positioner can convert the received current signal into a pneumatic signal and adjust the cylinder's movement based on the pneumatic signal.

[0045] Preferably, the current signal can be a current signal of 4 to 20 mA.

[0046] In another preferred embodiment of this invention, the valve can feed back changes in its opening degree to the positioner to achieve closed-loop control.

[0047] Therefore, changes in valve opening are fed back to the positioner via a feedback mechanism, thereby achieving closed-loop control and ensuring precise valve positioning. Attached Figure Description

[0048] To further illustrate the technical effects of the wind pressure control system according to this utility model, the present utility model will be described in detail below with reference to the accompanying drawings and specific embodiments, wherein:

[0049] Figure 1 This is a simplified structural diagram of a traditional wind pressure control system, in which the wind pressure control system is equipped with an electric actuator;

[0050] Figure 2 This is a simplified structural diagram of the wind pressure control system according to the present invention, wherein the wind pressure control system is equipped with a pneumatic regulating device; and

[0051] Figure 3 It is used for Figure 2 The diagram shows a simplified structural schematic of the pneumatic regulating device in the wind pressure control system.

[0052] Figure label:

[0053] 1. Center wheel;

[0054] 2. Duct circuit;

[0055] 3. Pressure measurement sensor;

[0056] 4. Pneumatic regulating device;

[0057] 4' Electric actuator;

[0058] 41. Positioner;

[0059] 42 cylinders;

[0060] 43. Valves;

[0061] 44a First link;

[0062] 44b Second Link;

[0063] 5. Manual proportional switch device;

[0064] P1 First fan;

[0065] P2 Second Fan;

[0066] P3 Third Fan;

[0067] V1 First manual valve;

[0068] V2 Second manual valve;

[0069] V3 Third manual valve;

[0070] S-type air pressure control system. Detailed Implementation

[0071] The working principle and technical effects of the wind pressure control system according to this utility model are explained below with reference to the accompanying drawings.

[0072] It should be understood that the embodiments described in this specification cover only a portion of the embodiments of this utility model, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments described in this specification without inventive effort are within the scope of protection of this utility model.

[0073] Unless otherwise defined, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0074] For example, the terms "comprising" and "having," and any variations thereof, used in the specification, claims, and accompanying drawings of this utility model are intended to cover a non-exclusive inclusion. The singular forms "a," "described," and "the" as used in the embodiments of this utility model and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise.

[0075] For example, in the specification of this utility model, the terms "first" and "second" are used only to distinguish the same devices or elements, and do not indicate or imply that the devices or elements referred to must have a specific arrangement order, or must be arranged and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In fact, if the names of the aforementioned devices or elements are interchanged, it will not create any undesirable limitation on the scope of protection of this utility model.

[0076] Figure 2 This is a simplified structural diagram of the wind pressure control system S according to this utility model. Figure 2As shown, the air pressure control system S includes: a central pulley 1; a first fan P1, a second fan P2, and a third fan P3 for providing air pressure, which are connected in parallel and then connected to the central pulley 1 via a duct circuit 2; a first manual valve V1 connected in series with the first fan P1 and a second manual valve V2 connected in series with the second fan P2; and a pressure measuring sensor 3 electrically connected to the central pulley 1 via the duct circuit 2, wherein the pressure measuring sensor 3 is used to measure the actual air pressure.

[0077] In the above technical solutions, the term "connection" indicates that pressurized air or other gases from the fan can reach other components via the duct circuit, while the term "electrical communication" indicates that a component outputs electrical signals to other components via wired or wireless means. The meanings of these terms should be understandable to those skilled in the art and do not exceed the scope of the original application text. Similar related modifications should be considered to fall within the protection scope of this utility model.

[0078] and Figure 1 Compared to the conventional wind pressure control system shown, the wind pressure control system S of this utility model differs in that it also includes:

[0079] (i) A pneumatic regulating device 4 for controlling airflow leakage, the pneumatic regulating device 4 being connected to the central roller 1 via the duct circuit 2; and / or

[0080] (ii) A manual proportional switch 5 that ensures the minimum air pressure of the center pulley 1, the manual proportional switch 5 being electrically communicated to the center pulley 1 via the duct circuit 2; and / or

[0081] (iii) The third manual valve V3 is provided for the pneumatic regulating device 4.

[0082] In the above embodiments, a redundant safety system is constructed by using the pneumatic regulating device 4, the manual proportional switch device 5 and the third manual valve V3, which are newly added compared to the prior art. The dual protection mechanism of "DCS (Distributed Control System) automatic control + manual mechanical adjustment" ensures that the minimum air pressure requirement can still be maintained when one or more of the pneumatic regulating device 4 or the fans P1 to P3 fail, thus avoiding system shutdown.

[0083] The specific working process of the wind pressure control system S according to this utility model is as follows:

[0084] (a) Normal operating conditions (automatic control mode)

[0085] Pressure sensor 3 detects air pressure in real time and feeds the detected data back to DCS. Based on the feedback signal from pressure sensor 3, DCS dynamically adjusts the opening of pneumatic regulating device 4 to control leakage air pressure and ensure that the air pressure entering the system is stable near a set value (e.g., the set value can be 110 mbar).

[0086] (b) Faulty Operating Conditions (Manual Emergency Mode)

[0087] In the event of a failure of the pneumatic regulator 4 or a malfunction of one or more of the fans P1 to P3, the system is switched to manual redundant control. At this time, the third manual valve V3 is slowly closed to reduce pressure loss and prevent a sudden pressure drop that could cause system shutdown. Then, based on data detected by the pressure sensor 3, the opening of the manual proportional switch 5 is manually adjusted to precisely control the air pressure, maintaining the minimum safe operating requirements (e.g., 70-80% of the previously set value). Therefore, the equipment can continue to operate for a short period even in a faulty state, providing maintenance personnel with response time (e.g., more than 30 minutes).

[0088] The above-mentioned pneumatic regulating device can achieve the following advantages:

[0089] (i) Improved dynamic response performance

[0090] The response time of pneumatic control devices is typically 50-150ms, while the response time of traditional electric actuators is typically 80-200ms. In comparison, pneumatic control devices improve the response time by about 30-50ms, making them particularly suitable for process scenarios that require rapid adjustment (such as chemical process control, emergency shut-off, etc.).

[0091] (ii) Higher safety and reliability

[0092] Intrinsically safe and explosion-proof (no electrical components required)

[0093] The pneumatic regulating device can automatically reset to a safe position in case of failure, making it suitable for special working environments such as flammable and explosive environments.

[0094] (iii) Reduced maintenance costs

[0095] Pneumatic regulating devices have a simple mechanical structure, a failure rate that is 40-60% lower than that of electric actuators, a maintenance cycle that is 2-3 times longer (typical maintenance cycle can reach more than 5 years), and spare parts costs that are more than 30% lower.

[0096] (iv) Energy-saving benefits

[0097] Pneumatic control devices do not require a continuous power supply and only consume compressed air when switching states, saving 15-25% more energy than electric actuators.

[0098] (v) Adaptability to special working conditions

[0099] Pneumatic regulating devices have excellent high-temperature resistance (typically above 200℃), and not only do they have better vibration resistance than electric actuators, but they can also work stably in harsh environments such as humidity and dust.

[0100] Please see Figure 3 This diagram is used for Figure 2 The diagram shows a simplified structural schematic of the pneumatic regulating device of the wind pressure control system S.

[0101] In a preferred embodiment, the pneumatic regulating device 4 includes: a valve 43 through which the air duct circuit 2 passes; a cylinder 42 that drives the valve 43 to move, i.e., moves the valve 43 and adjusts the opening of the valve 43; and a positioner 41 that adjusts the movement of the cylinder 42, wherein the positioner 41 is associated with the cylinder 42 via a first link 44a, and the cylinder 42 is associated with the valve 43 via a second link 44b.

[0102] In the above technical solutions, the term "association" covers not only the situation where two components are directly connected, but also the situation where two components are indirectly connected by means of one or more connecting or coupling elements. The meaning of the above terms should be understandable to those skilled in the art and does not exceed the scope of the original application text. Similar related modifications should all be considered to fall within the protection scope of this utility model.

[0103] The positioner 41 converts the received current signal into a pneumatic pressure signal and adjusts the action of the cylinder 42 based on the pneumatic pressure signal. The current signal is a current signal of 4 to 20 mA. As a result, the change in the opening degree of the valve 43 is fed back to the positioner 41 through the feedback mechanism, thereby realizing closed-loop control and ensuring the precise positioning of the valve 43.

[0104] Traditional air pressure control systems use electric actuators 4' to control airflow leakage. Typically, the electric actuator 4' includes a valve and an integrated electric positioning device and its actuation mechanism. The electric positioning device adjusts its actuation mechanism to drive the valve, thereby regulating the valve opening and controlling the flow rate of gas through the valve.

[0105] Compared with the electric actuator 4' mentioned above, the pneumatic regulating device 4 in this embodiment also regulates the gas flow by adjusting the opening of the valve, but this pneumatic regulating device 4 uses compressed air as an energy source, while the electric actuator 4' in the prior art uses electricity as an energy source.

[0106] The electric actuator 4' drives the valve to switch or regulate the pipeline medium. Specifically, the working principle of this electric actuator is: receiving a control signal, driving the valve component (or valve stem) to move, thereby changing the valve opening and thus controlling the fluid flow.

[0107] In contrast, the pneumatic regulating device 4 in this embodiment converts the control system signal into cylinder movement, thereby achieving precise valve positioning. Specifically, the working principle of this pneumatic regulating device is as follows: the positioner receives a signal from the DCS or PLC control system, typically a 4-20mA current signal, and then converts it into a corresponding air pressure signal to drive the cylinder movement, ensuring that the valve opening corresponds to the control signal. Simultaneously, changes in the valve opening are fed back to the positioner through a feedback mechanism, thus achieving closed-loop control and ensuring precise valve positioning.

[0108] Although the structure and technical effects of the wind pressure control system according to the present invention have been described above in conjunction with preferred embodiments and accompanying drawings, those skilled in the art should recognize that the above examples are merely illustrative and should not be construed as limiting the present invention. Therefore, modifications and variations can be made to the present invention within the spirit and scope of the claims, and all such modifications and variations will fall within the scope claimed by the claims of the present invention.

Claims

1. A wind pressure control system (S), comprising: Central wheel (1); A first fan (P1), a second fan (P2), and a third fan (P3) are provided for providing air pressure. The fans (P1, P2, and P3) are connected in parallel to each other and then connected to the central roller (1) via the air duct circuit (2). A first manual valve (V1) connected in series with the first fan (P1) and a second manual valve (V2) connected in series with the second fan (P2); A pressure measuring sensor (3) that measures actual wind pressure, the pressure measuring sensor (3) being electrically communicated to the central pulley (1) via the duct circuit (2); and A pneumatic regulating device (4) for controlling air volume leakage is connected to the central roller (1) via the air duct circuit (2) to stabilize the air pressure at a set value.

2. The wind pressure control system (S) as described in claim 1, characterized in that, It also includes a manual proportional switch (5) to ensure the minimum air pressure of the center roller (1), the manual proportional switch (5) being electrically communicated to the center roller (1) via the air duct circuit (2).

3. The wind pressure control system (S) as described in claim 2, characterized in that, The pneumatic regulating device (4) is equipped with a third manual valve (V3).

4. The wind pressure control system (S) as described in claim 2, characterized in that, The minimum air pressure of the central roller (1) is 70 to 80% of the set value.

5. The wind pressure control system (S) as described in any one of claims 1 to 4, characterized in that, The set value is 110 mbar.

6. The wind pressure control system (S) as described in claim 1, characterized in that, The pneumatic regulating device (4) includes: Valve (43), through which the duct circuit (2) passes; Cylinder (42), which drives valve (43) to actuate and adjust the opening degree of valve (43); and Positioner (41) adjusts the action of cylinder (42).

7. The wind pressure control system (S) as described in claim 6, characterized in that, The positioner (41) is associated with the cylinder (42) via a first link (44a), and the cylinder (42) is associated with the valve (43) via a second link (44b).

8. The wind pressure control system (S) as described in claim 6, characterized in that, The positioner (41) converts the received current signal into a pneumatic signal and adjusts the action of the cylinder (42) based on the pneumatic signal.

9. The wind pressure control system (S) as described in claim 8, characterized in that, The current signal is a current signal of 4 to 20mA.

10. The wind pressure control system (S) as described in claim 6, characterized in that, The valve (43) feeds back its opening change to the positioner (41) to achieve closed-loop control.

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