Accurate aeration rate control valve and application thereof

Abstract

The invention particularly relates to a regulating valve for accurately controlling aeration flow. The accurate aeration rate control valve is characterized by comprising a driving motor and a polygonal flow regulating valve. The driving motor is a stepping motor, a servo motor or others. The polygonal flow regulating valve comprises a valve body, a worm gear, a worm, a valve plate and a sliding block, the valve body is formed by combining a left half valve body and a right half valve body, the worm gear and the worm are arranged between the two half valve bodies, the worm gear and a boss on one half valve body form a positioning rotation pair, and the worm gear and the worm form a transmission pair; a plurality of rotating guide grooves which are annularly distributed at equal intervals are formed in the side wall of the worm gear; the multiple sliding blocks move in the rotating guide grooves, one ends of the sliding blocks extend out of the rotating guide grooves in the worm wheel to be connected with the valve plates in a fastened and clamped mode and extend into the translation guide grooves formed in the valve body, the valve plates are tightly connected with the sliding blocks in a clamped mode, and along with rotation of the worm wheel, the multiple valve plates are driven by the sliding blocks to do opening and closing movement. According to the accurate aeration rate control valve, the defects in the prior art are overcome, the aeration rate in an accurate aeration system can be accurately controlled, the requirements of all process stages for the aeration rate are completely met, and therefore energy can be further saved while the sewage treatment quality is guaranteed; and a good foundation is laid for comprehensive popularization of the accurate aeration system in the sewage treatment industry.

Description

Technical Field

[0001] The present invention belongs to the field of mechanical equipment and relates to an aeration volume precision control valve, and more specifically, to a regulating valve capable of precisely controlling aeration volume flow in a sewage treatment scenario. Background Art

[0002] In the prior art, the aeration volume of the sewage treatment aeration system is generally controlled by adjusting the flow rate of each blower. Due to the limitation of the flow rate adjustment range of the blower itself, it cannot meet the synchronous adjustment requirements of the oxygen supply of the entire biochemical pool, resulting in power waste. With the further improvement of emission reduction and energy saving requirements, a precise aeration control system has been developed in China. The system integrates the automatic detection of the index content of the entire unit and the biochemical pool into an intelligent system. According to the detection results of the biochemical pool, the intelligent system will adjust the air supply of the unit in real time. The gas flow entering each biochemical pool is controlled by the flow control valve. According to the requirements of the precise aeration system, the control valve should meet the following technical requirements: (1) The pressure loss is not greater than 10mbar; (2) It has stable continuous adjustment characteristics within the set 0-100% stroke range. Therefore, it is imperative to develop a control valve dedicated to precise aeration.

[0003] In the current sewage treatment precision aeration system, the aeration volume is regulated by controlling the opening of the regulating valve. Regulating valves generally use butterfly valves, diamond valves and aperture valves. Among them, the aperture valve has the highest control accuracy. The aperture valve is also called a polygonal flow regulating valve, and its structure is disclosed in the patent named "Precise Control Valve for Aeration Volume in Sewage Treatment" and the patent number is ZL202321951819.7. Like other valves, the polygonal flow regulating valve is controlled by a universal valve electric device to control the valve opening.

[0004] However, the polygonal flow control valve also has many shortcomings in practical applications. Due to the limitation of the motion accuracy of the general valve electric device itself, and the manufacturing errors of the polygonal flow control valve's own transmission pair - worm gear transmission - and other moving parts, the polygonal flow control valve still has a large flow control error in practical applications, which cannot meet the requirements of sewage treatment quality. Therefore, it limits the promotion and application of precision aeration systems in the sewage treatment industry. Summary of the invention

[0005] The present invention proposes an aeration volume precision control valve, which solves the defects of the prior art and enables the aeration volume in the precision aeration system to be precisely controlled, fully meeting the aeration volume requirements of each process stage, thereby further saving energy while ensuring the quality of sewage treatment, and laying a good foundation for the comprehensive promotion of the precision aeration system in the sewage treatment industry.

[0006] On the one hand, the aeration volume precision control valve of the present invention includes a driving motor and a polygonal flow regulating valve.

[0007] The drive motor can be a stepper motor, a servo motor or other motors.

[0008] The polygonal flow regulating valve includes: a valve body, a worm gear, a worm, a valve plate, and a slider. The valve body is composed of two left and right half valve bodies. The worm gear and the worm are arranged in the middle of the two half valve bodies. The worm gear and the boss on one of the half valve bodies form a positioning rotation pair, and the worm gear and the worm form a transmission pair. The side wall of the worm gear is provided with a plurality of rotation guide grooves distributed in an annular shape and at equal intervals. A plurality of sliders move in the rotation guide groove, and one end of the slider extends out of the rotation guide groove on the worm gear and is tightly engaged with the valve plate and extends into the translation guide groove provided on the valve body. The valve plate is tightly engaged with the slider. As the worm gear rotates, the plurality of valve plates open and close driven by the slider.

[0009] The number of the valve plates is the same as the number of the guide grooves on the valve body and the number of the rotating guide grooves on the worm gear, which is 3-12.

[0010] In one embodiment, the drive motor of the present invention is directly connected to the polygonal flow control valve in a horizontal manner.

[0011] In another embodiment, the driving motor of the present invention is connected to the polygonal flow control valve in a horizontal manner or in a vertical manner through a transitional connection piece.

[0012] The transitional connection member can be a steering transmission component, such as a right-angle gear box. A hand wheel component can be connected to the right-angle gear.

[0013] On the other hand, the aeration volume precision control valve of the present invention is also provided with an encoder or other positioner and a limit switch at one end of the worm. During the adjustment process, the encoder can detect the actual opening and convert it into a signal to be fed back to the electronic control system, thereby issuing a compensation instruction to compensate (correct) the valve opening and improve the adjustment accuracy. At the same time, since the encoder can dynamically feedback the actual opening of the valve adjustment and correct the opening error in time, this greatly reduces the positioning error of the valve caused by the manufacturing error of the drive device and the moving parts, and significantly improves the repeated positioning accuracy.

[0014] In another aspect, the aeration volume precision control valve of the present invention further includes a display screen, which is used for on-site debugging and observation.

[0015] On the other hand, the aeration volume precision control valve of the present invention further includes a protective cover, and the electrical components such as the driving motor, display screen, surge protector, terminal block, switching power supply and control circuit board are all arranged inside the protective cover.

[0016] Compared with the prior art, the technical solution of the present invention produces the following beneficial effects:

[0017] (1) High flow regulation accuracy. Since the valve is driven directly by a motor, there is one less worm gear drive than in a general drive device, so the driving efficiency and transmission accuracy are improved, thereby improving the regulation accuracy.

[0018] (2) Low cost and high reliability. Since the valve is directly driven by a motor, the general drive device is omitted, which reduces the manufacturing cost. At the same time, since the structure is much simpler than the original technology, the reliability is improved and maintenance is more convenient.

[0019] (3) Compact structure, easy to use, and prevent adverse effects of adverse environments on electrical components. Because it uses a direct drive motor, the volume is much smaller than that of a general electric device. In addition, due to its compact structure, the electrical components can be placed in a protective cover to prevent adverse effects of the environment on its components. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of an implementation scheme of the present invention. Figure 1 (A) is a schematic diagram showing the structure of the product of the embodiment in a closed state; Figure 1 (B) is a schematic diagram showing the structure of the product of this implementation scheme in the fully open state.

[0021] Figure 2 This is a partial cross-sectional view taken along line AA of the present invention, which mainly shows the valve portion of the present invention.

[0022] Figure 3 It is a structural schematic diagram of another embodiment of the present invention. Figure 3 (A) is a schematic diagram showing the structure of the product of the embodiment in a closed state; Figure 3 (B) is a schematic diagram showing the structure of the product of this implementation scheme in the fully open state.

[0023] Figure 4 It is a structural schematic diagram of another embodiment of the present invention.

[0024] Figure 5 It is a flow chart of the application of the present invention in precise aeration of sewage treatment. Specific implementation plan

[0025] 1) Combine the following Figure 1-2 , describing Example 1 of the present invention.

[0026] This embodiment 1 provides a sewage treatment aeration volume precision control valve, and its specific structure mainly includes a motor 1 and a polygonal flow control valve 20. The polygonal flow control valve 20 mainly includes a left half valve body 91, a right half valve body 92, a worm gear 5, a worm 4, a valve plate 8, a slider 19, etc.

[0027] like Figure 2 As shown, the valve body is composed of a left valve body 91 and a right valve body 92. The worm gear 5 is arranged in the middle of the left and right valve bodies, positioned on the boss of the right valve body 92 to form a rotating pair. A valve plate 8 is provided between the worm gear 5 and the left valve body 91. The slider 19 is tightly engaged with the valve plate 8. One end of the slider 19 extends into the corresponding translation guide groove 7 of the left valve body 91, and the other end is provided with a rolling bearing 18. The bearing 18 forms a rotating pair with the rotation guide groove 6 on the worm gear. The slider 19 drives the valve plate 8 to move along the rotation guide groove 6 and the translation guide groove 7.

[0028] like Figure 1 As shown, a worm component 4 is provided in the valve body and meshes with a worm wheel 5 to form a transmission pair, and one end of the worm 4 is directly connected to the motor 1 horizontally.

[0029] The working principle of this embodiment is as follows: the motor 1 drives the worm 4 to rotate, and the worm 4 drives the worm wheel 5 to rotate, so that the rolling bearing 18 moves in the rotating guide groove 6, and the slider 19 drives the valve plate 8 to move along the translation guide groove 7. Since the six valve plates 8 move synchronously, the center of the hexagonal flow channel formed by the valve plates 8 remains unchanged while scaling in parallel (coinciding with the center line of the valve and the pipeline), thereby ensuring the stability of the gas flow field of this product during the flow adjustment process and ensuring the accuracy of flow adjustment.

[0030] 2) Combine the following Figure 2-3 , describing Example 2 of the present invention.

[0031] This embodiment 2 provides a precise control valve for aeration volume of sewage treatment, and its specific structure mainly includes a motor 1, a right-angle gear box 2, a left half valve body 91, a right half valve body 92, a worm gear 5, a worm 4, a valve plate 8, a slider 19, an encoder 16, a handwheel component 3, a protective cover 17, a surge protector 14, a terminal block 15, a switching power supply 11, a circuit board 12, a display screen 13, etc.

[0032] like Figure 3 As shown, the motor 1 is indirectly connected to the worm 4 through the right-angle gearbox 2, so that the motor 1 and the worm are vertically connected, the horizontal end of the right-angle gearbox is connected to the handwheel component 3, and the other end of the worm is provided with an encoder 16; a protective cover 17 is provided at the upper end of the valve body, and the protective cover is provided with electrical components such as the motor 1, a surge protector 14, a terminal block 15, a switching power supply 11, a circuit board 12, and a display screen 13.

[0033] The working principle of this embodiment is as follows: the motor 1 indirectly drives the horizontal worm 4 through the right-angle gear box 2, and the worm 4 drives the worm wheel 5 to rotate, so that the rolling bearing 18 moves in the rotating guide groove 6, and the slider 19 drives the valve plate 8 to move along the translation guide groove 7. Since the six valve plates 8 move synchronously, the hexagonal flow channel composed of the valve plates 8 does not change its center while scaling in parallel, ensuring the stability of the flow field. The encoder 16 on the worm 4 can detect the actual number of revolutions of the worm 4 and feed it back to the electronic control system, correct the valve opening, and ensure the accuracy of flow regulation. The protective cover 17 can protect the electronic components from the adverse effects of the environment, ensuring the accuracy and safety of the action of the present invention, wherein the display screen 13 can facilitate on-site debugging and observation.

[0034] 3) Combine the following Figure 4 , describing Example 3 of the present invention.

[0035] This embodiment 3 provides a sewage treatment aeration volume precision control valve, the specific structure of which mainly includes valve components such as a motor 1, a right-angle gear box 2, a handwheel component 3, an encoder 16, a worm 4 and a worm wheel 5.

[0036] like Figure 4 As shown, the motor 1 is indirectly connected to the worm 4 horizontally through the right-angle gearbox 2, the upper end (vertical end) of the right-angle gearbox is connected to the handwheel component 3, and the other end of the worm 4 is provided with an encoder 16.

[0037] The working principle of this embodiment is exactly the same as that of embodiment 2, except that the motor 1, the worm 4 and the right-angle gearbox 2 are installed in different positions. The hand wheel component 3 is mainly provided to facilitate the debugging and maintenance of the present invention.

[0038] 4) Combine the following Figure 5 , illustrating the application of a specific embodiment of the present invention in sewage treatment.

[0039] The precise aeration system for sewage treatment mainly includes the master control system MCP, blower, main pipe, branch pipe, pressure gauge, flow meter. The control valve, aeration tank and DO detection head - dissolved oxygen meter of the present invention are composed. The pressure gauge is arranged on the main pipe, the blower outlet is connected to the main pipe, and the control valve and flow meter of the present invention are arranged on several branch pipes, and the branch pipes are connected to the aeration pipeline system of the aeration tank. Figure 5 The application process of the present invention in precise aeration of sewage treatment is explained.

[0040] At each stage of the aeration process, the aeration amount is different, such as Figure 5As shown, the total amount of oxygen required for each stage of the aeration tank is achieved by the master control cabinet MCP by controlling the guide vane opening of each blower of the blower unit. Even in the same process stage, the amount of oxygen required in each zone of the aeration tank, i.e., DO1, DO2, and DO3, is different. The distribution of aeration volume in each zone is achieved by adjusting the opening of the patented control valve. During the entire aeration process, the intelligent dissolved oxygen meter installed in each zone of the aeration tank will dynamically monitor the dissolved oxygen content, i.e., the DO value, and regularly feed back the DO value signal to the master control cabinet MCP. The MCP then adjusts the opening of each blower and the patented control valve until the DO value meets the process requirements.

[0041] It can be seen that the precise aeration process is to dynamically adjust the aeration volume according to the real-time monitoring data of the DO value in each process stage. It is a process of intelligent linkage between the blower and the patented control valve. The blower group controls the total aeration volume in each stage, and the control valve group is responsible for accurately allocating the aeration volume in each location and can realize real-time adjustment, thereby improving the aeration utilization rate and achieving the purpose of energy saving.

[0042] 5) Comparative experiment between the aeration volume precision control valve of the embodiment of the present invention and the prior art embodiment

[0043] The control valve driven by the drive motor used in Examples 1-3 of the present invention has achieved significantly improved test results in sewage treatment scenarios compared with the same polygonal flow control valve driven by a universal driver.

[0044] The test process and operation steps are as follows:

[0045] 1. The orifice flow meter and the control valve described in the embodiment of the present invention are connected in series to the air pressure pipeline, and the compressed air is provided by the blower;

[0046] 2. Fully open the control valve of the present invention, start the blower, and record the flow rate displayed by the orifice flowmeter after the pipeline pressure stabilizes. The flow rate is calculated by the pressure difference before and after the orifice plate through a computer, and the opening degree of the patented valve at this time is also recorded;

[0047] 3. The opening of the control valve of the present invention is gradually reduced by 2.5% to obtain the corresponding flow rate of the orifice flowmeter, thereby establishing the corresponding relationship between the opening and closing opening of the control valve of the present invention and the flow rate;

[0048] 4. Input different flow rates under the above corresponding relationship into the electronic control system, and the control valve will automatically open and close the corresponding opening, and obtain the new corresponding relationship between the opening and the flow rate. By comparing the data of the new and old flow rates under the same opening, the flow regulation accuracy of the control valve of the present invention can be obtained. By comparing the opening data under the same new and old flow rates, the repeat positioning accuracy of the control valve of the present invention can be obtained. Repeat this step 3 times to obtain the flow regulation error and repeat positioning error results shown in the following table.

[0049] 5. The control valve of the present invention is replaced by the same polygonal flow control valve driven by a universal driver, and the test is carried out according to the above steps 1-4 under the same conditions to obtain the flow control error and repeat positioning error results shown in the following table.

[0050] The comparative experimental results are as follows:

[0051] Test products Flow regulation error Repeat positioning error Universal Actuator Control Valve About +\-1.2-1.5% About 1% Embodiment 1 of the present invention Less than +\-0.80% Less than +\-0.80% Embodiment 2 of the present invention Less than +\-0.75% Less than +\-0.75% Embodiment 3 of the present invention Less than +\-0.75% Less than +\-0.75%

[0052] From the above experiments, it can be seen that the precision control valve improved by replacing the universal driver with a stepper motor in the present invention has improved the aeration flow regulation accuracy and repeatability positioning accuracy by more than 37% and more than 25% respectively in sewage treatment applications, achieving significantly good technical effects.

[0053] To sum up, the technical ideas and solutions of the present invention can be applied to any technical field that requires aeration flow regulation and control, including but not limited to sewage treatment, energy conservation and environmental protection, etc.; on the other hand, the technical ideas and solutions of the present invention cover a variety of implementation methods, which are difficult to list one by one through the embodiments of the present invention. All local changes or modifications made to the implementation methods of the present invention are still covered by the technical solutions of the present invention.

Claims

1. A precise aeration control valve, characterized in that It includes a driving motor and a polygonal flow regulating valve.

2. According to the aeration volume precision control valve according to claim 1, the driving motor is a stepping motor, a servo motor or others.

3. According to claim 1, the aeration volume precision control valve, the polygonal flow regulating valve comprises: A valve body, a worm gear, a worm, a valve plate and a slider, wherein the valve body is composed of two left and right half valve bodies, the worm gear and the worm are arranged in the middle of the two half valve bodies, the worm gear and the boss on one of the half valve bodies form a positioning rotation pair, and the worm gear and the worm form a transmission pair; a plurality of rotation guide grooves equidistantly distributed in an annular shape are provided on the side wall of the worm gear; a plurality of sliders move in the rotation guide groove, and one end of the slider extends out of the rotation guide groove on the worm gear and is tightly engaged with the valve plate and extends into the translation guide groove provided on the valve body, the valve plate is tightly engaged with the slider, and as the worm gear rotates, the plurality of valve plates open and close driven by the slider.

4. According to the aeration volume precision control valve of claim 1, the drive motor is directly connected to the polygonal flow regulating valve in a horizontal manner, or the drive motor is connected to the polygonal flow regulating valve in a horizontal manner or in a vertical manner through a transitional connection.

5. According to the aeration volume precision control valve of claim 4, the transitional connection piece is a steering transmission component, such as a right-angle gear.

6. According to the aeration volume precision control valve of claim 3, one end of the worm is provided with an encoder or other positioner and a limit switch.

7. According to the aeration volume precision control valve of claim 3, the number of the valve plates is the same as the number of the guide grooves on the valve body and the number of the rotating guide grooves on the worm gear, which is 3-12.

8. The aeration volume precision control valve according to claim 3, further comprising a display screen, wherein the display screen is used for on-site debugging and observation.

9. The aeration volume precision control valve according to claim 5, wherein the right-angle gear is connected to a hand wheel component. 10 . The aeration volume precision control valve according to claim 9 , further comprising a protective cover, wherein the stepper motor and the display screen are both arranged inside the protective cover.

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