Positive pressure sonic nozzle air flow detection equipment

Abstract

The invention relates to the technical field of gas flow detection, in particular to positive pressure sonic nozzle air flow detection equipment which comprises an air compressor, a conveying connecting pipe, a filter, an automatic alignment adding device, a flow meter, an extrusion alignment device, a first sealing butt-joint pipe, a second sealing butt-joint pipe, a sonic nozzle, a supporting frame and a buffer container. The conveying connecting pipe is fixedly connected to the air compressor, the filter is arranged on the outer side of the air compressor, the conveying connecting pipe is fixedly connected with the two ends of the filter, and the buffering container is fixedly arranged on the side, away from the air compressor, of the filter through the conveying connecting pipe. The supporting frame is fixedly connected to a conveying connecting pipe arranged on the side, away from the filter, of the buffering container. By collecting temperature and pressure data in real time and automatically correcting gas density and compression factors, the influence of environmental factors on a measurement result is reduced, the buffer container is combined with the proportioning valve, the pressure fluctuation can be controlled within + / -0.2%, and continuous and stable gas flow is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of gas flow detection, in particular to positive pressure sonic nozzle air flow detection equipment. Background Art

[0002] The sonic nozzle air flow detection equipment is a high-precision gas flow metering device based on the sonic nozzle principle. It achieves stable and accurate flow measurement through critical flow characteristics. Its core component is the sonic nozzle. Through the specific flow channel design, the gas reaches the speed of sound at the throat. At this time, the flow rate depends only on the inlet conditions (temperature, pressure) and gas properties, and is independent of the downstream pressure.

[0003] The existing Chinese patent publication number is CN2814357Y. The existing technology includes a gas source, a sonic nozzle standard table, and a calibration workbench, and each part is connected by a pipeline. The gas source part of the utility model uses the atmosphere as the calibration medium, and the air inlet is connected in series with a high-pressure blower, a proportional control valve, and a buffer container through a pipeline. Since the utility model uses a high-pressure blower to drive the atmosphere, after adjustment by the proportional control valve and buffering by the buffer container, a positive pressure stabilized gas source with high stability is formed, which can more realistically simulate the working state of the flow meter to be tested, thereby improving the calibration accuracy of the device. At the same time, the utility model has a low investment cost, simple equipment, and easy operation, and occupies a smaller area than traditional positive pressure equipment;

[0004] During the use of the above-mentioned device and the existing positive pressure sonic nozzle air flow detection equipment, it is not possible to clean the inside of the filter or replace the filter element in a timely and convenient manner during continuous long-term detection, resulting in poor accuracy of the detection results. The existing filter element has poor interception and filtration effect and cannot fully clean the gas. At the same time, it is not possible to quickly position and fix multiple flow meters to be detected for continuous and efficient detection, resulting in low detection efficiency and inconvenience in detection. Therefore, a positive pressure sonic nozzle air flow detection device is needed to improve the above-mentioned problems. Summary of the Invention

[0005] In view of the problems in the prior art, the present invention provides a positive pressure sonic nozzle air flow detection device.

[0006] The technical solution adopted by the present invention to solve its technical problems is: a positive pressure sonic nozzle air flow detection device, including an air compressor, a delivery connecting pipe, a filter, an automatic alignment and adding device, a flow meter, an extrusion alignment device, a first sealed butt joint pipe, a second sealed butt joint pipe, a sonic nozzle, a support frame and a buffer container, the delivery connecting pipe is fixedly connected to the air compressor, the filter is arranged on the outside of the air compressor, and the delivery connecting pipe is fixedly connected to both ends of the filter, the buffer container is fixedly arranged on the side of the filter away from the air compressor through the delivery connecting pipe, the support frame is fixedly connected to the delivery connecting pipe arranged on the side of the buffer container away from the filter, the sonic nozzle is arranged on the delivery connecting pipe arranged at one end of the buffer container away from the filter, the extrusion alignment device is arranged at one end of the delivery connecting pipe away from the air compressor, the first sealed butt joint pipe is arranged on the extrusion alignment device, the second sealed butt joint pipe is fixedly connected to the sonic nozzle through the delivery connecting pipe, the flow meter is fixedly arranged between the second sealed butt joint pipe and the first sealed butt joint pipe, and the automatic alignment and adding device is arranged on the outside of the second sealed butt joint pipe and the first sealed butt joint pipe.

[0007] Preferably, a first flow rate sensor and a second flow rate sensor are fixedly mounted on the delivery connecting pipes at both ends of the filter, respectively, and a proportional regulating valve is fixedly mounted on the delivery connecting pipes at both ends of the buffer container.

[0008] Preferably, the filter includes a filter tank, a filter element, a sealing card plate and a first support base, the sealing card plate is fixedly installed on the end of the filter tank by bolts, the filter element is evenly arranged inside the filter tank, the first support base is fixedly connected to the bottom end of the filter tank, fixed connecting columns are evenly fixedly installed between the edges of the filter element, the sliding card plate is evenly fixedly connected to the two ends of the filter element, and the sliding card plate is slidably clamped on the filter tank.

[0009] Preferably, the buffer container includes a pressure sensor, a solenoid valve, a buffer tank, a pressure gauge and a second support base, the solenoid valve is symmetrically fixedly installed in the middle of the upper end and the bottom end of the buffer tank, the pressure sensor and the pressure gauge are arranged on the buffer tank, and the second support base is fixedly connected to the bottom end of the buffer tank.

[0010] Preferably, the automatic alignment adding device includes a rotating adjustment gear disk, a driving gear, a third support base, a rotating adjustment disk, a support adjustment arm, a clamping limit ring, a first electric push rod and a support bracket, the middle parts of both sides of the rotating adjustment disk are rotatably clamped inside the upper end of the third support base, the rotating adjustment gear disk is rotatably clamped on both sides of the upper end of the third support base, and the middle part of the rotating adjustment gear disk is fixedly connected to the middle part of the rotating adjustment disk, the support adjustment arm is evenly fixedly installed on the rotating adjustment disk, and the support adjustment arm is provided with six, the driving gear is rotatably installed on the third support On both sides of the base, the two driving gears are respectively located at the bottom ends of the rotation adjustment gear disc, and the driving gear is meshed with the rotation adjustment gear disc, the motor is fixedly mounted on the third support base, the driving end of the motor is fixedly connected to the middle part of the driving gear, the middle parts of the two driving gears are fixedly connected through a synchronization rod, and a support bracket is symmetrically fixedly mounted on the support adjustment arm, a first electric push rod is fixedly mounted on the support bracket, and the fixing limit ring is symmetrically fixedly connected to the front end of the first electric push rod, and a flow meter is fixedly arranged between the symmetrically distributed fixing limit rings.

[0011] Preferably, the extrusion alignment device includes a fixed frame, a second electric push rod, an extrusion push plate, a buffer spring, an extrusion fixed plate and a fourth support base, the fixed frame is fixedly connected to the upper end of the fourth support base, the second electric push rod is evenly fixedly installed on the fixed frame, the extrusion push plate is fixedly connected to the front end of the second electric push rod, the buffer spring is evenly fixedly connected to the side end of the extrusion push plate away from the second electric push rod, the extrusion fixed plate is fixedly connected to the side end of the buffer spring away from the extrusion push plate, and the extrusion fixed plate is fixedly installed on the first sealing butt joint tube.

[0012] Preferably, the ends of the first sealing butt joint pipe and the second sealing butt joint pipe are inserted into the interior of the connecting ends at both ends of the flow meter through sealing rubber rings.

[0013] Preferably, the first sealing butt joint pipe and the second sealing butt joint pipe have the same horizontal height, and a temperature sensor is provided on the buffer tank.

[0014] Preferably, the filter element adopts a multi-layer composite structure, the outer protective layer is stainless steel, the internal filter layers are a pre-filter layer and a main filter layer, the pre-filter layer is made of melt-blown polypropylene, and the main filter layer is made of glass fiber.

[0015] The preparation process of the filter element includes the following steps:

[0016] S1. Raw material pretreatment

[0017] Material slitting: Slice stainless steel mesh, meltblown PP, glass fiber, etc. into coils according to the designed size;

[0018] Surface treatment: Plasma activation of PTFE membrane to enhance interlayer bonding;

[0019] S2, laminated composite

[0020] Sequential layering: stack the outer stainless steel mesh → melt-blown PP pre-filter layer → glass fiber or PTFE main filter layer → polyester support layer in sequence;

[0021] Hot pressing and shaping: The temperature of the hot roller press is controlled at 180-220℃ and the pressure is controlled at 0.5-1.2MPa to make each layer bonded to form a composite filter material;

[0022] S3, folding or winding

[0023] Pleating process: Use a CNC pleating machine to fold the composite filter material into a wave shape, with a pleat height of 5-15mm and pleat number of 50-200 / m to increase the filtration area;

[0024] Winding: For cylindrical filter elements, the filter material is spirally wound on a central skeleton made of ABS or metal;

[0025] S4, end cap packaging

[0026] End cap bonding: Use epoxy resin or polyurethane adhesive to bond the metal or plastic end cap to the filter material, with a curing temperature of 60-80°C and a curing time of 2-4 hours;

[0027] Sealing treatment: Apply silicone sealing ring at the joint between the end cap and the filter material to ensure air tightness;

[0028] S5. Post-processing and testing

[0029] Electret treatment, for PP filter materials: applying a high voltage electric field (15-25kV) through corona discharge equipment to make the fiber electrostatic and enhance adsorption efficiency;

[0030] Integrity test: Bubble point test: After soaking the filter element, pressurize it to 0.2-0.3MPa, observe the bubble point to determine whether the maximum pore size meets the requirements;

[0031] Particle challenge test: introduce standard dust to verify filtration efficiency.

[0032] Beneficial effects of the present invention:

[0033] 1. During the use of the present invention, the automatic alignment and adding device can automatically adjust and supplement the flow meter that needs to be tested. During the continuous testing of multiple flow meters, after the flow meter is removed by the mechanical arm after the test, the motor in the automatic alignment and adding device can automatically run to drive the driving gear to rotate, so that the rotating driving gear drives the rotating adjustment disk to rotate by rotating the adjusting tooth disk. The rotating adjusting disk rotates the flow meter fixed between the fixing limit rings to a specified angle and moves to between the first sealing butt joint and the second sealing butt joint through the supporting adjustment arm, thereby realizing automatic and accurate supplementation and addition of the flow meter that needs to be tested, so that multiple flow meters can be continuously and efficiently tested. The detection is realized, and the automatic replenishment and addition can be sealed and connected to the device for detection, so that the detection efficiency is greatly improved. The first flow velocity sensor and the second flow velocity sensor can accurately detect and judge the flow velocity changes of the airflow at both ends of the filter, so as to facilitate automatic and accurate judgment of the blockage inside the filter. The filter element inside the filter can be removed for cleaning or replacement in time and conveniently, so that the filter can always have a good filtering effect, remove particulate matter, oil mist and moisture in the gas, and ensure that the detection can be carried out accurately. The filter element in this device has a good interception and filtration effect, which can fully remove impurities and debris in the gas, so that the detection result is accurate.

[0034] 2. The present invention collects temperature and pressure data in real time, automatically corrects gas density and compressibility factor, and reduces the impact of environmental factors on measurement results. The buffer container combined with the proportional control valve can control pressure fluctuations within ±0.2%, ensuring continuous and stable airflow and making the detection results more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The present invention will be further described below with reference to the accompanying drawings and examples.

[0036] Figure 1 This is a schematic diagram of the three-dimensional structure of the main body of the present invention from the front perspective;

[0037] Figure 2 This is a schematic side view of the three-dimensional structure of the main body of the present invention;

[0038] Figure 3 Schematic diagram of the filter structure of the present invention;

[0039] Figure 4 Schematic diagram of the internal structure of the filter in the present invention;

[0040] Figure 5 Schematic diagram of the buffer container structure in the present invention;

[0041] Figure 6 This is a structural diagram of the automatic alignment adding device in the present invention;

[0042] Figure 7 This is a schematic side view of the three-dimensional structure of the automatic alignment and adding device of the present invention;

[0043] Figure 8 Schematic diagram of the structure of the extrusion alignment device in the present invention;

[0044] Figure 9 Schematic diagram of the detection process of the present invention.

[0045] In the figure: 1-air compressor, 2-delivery connecting pipe, 3-first flow rate sensor, 4-filter, 5-second flow rate sensor, 6-automatic alignment and adding device, 7-flow meter, 8-extrusion alignment device, 9-first sealing butt joint, 10-second sealing butt joint, 11-sonic nozzle, 12-support frame, 13-proportional control valve, 14-buffer container, 15-filter tank, 16-filter element, 17-sealing card plate, 18-first support base, 19-sliding card plate, 20-fixed connecting column , 21-pressure sensor, 22-solenoid valve, 23-buffer tank, 24-pressure gauge, 25-second support base, 26-rotation adjustment gear disc, 27-drive gear, 28-third support base, 29-rotation adjustment disc, 30-support adjustment arm, 31-fixed limiting ring, 32-first electric push rod, 33-support bracket, 34-motor, 35-fixed frame, 36-second electric push rod, 37-extrusion push disc, 38-buffer spring, 39-extrusion fixed disc, 41-fourth support base. DETAILED DESCRIPTION

[0046] In order to enable people skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work should fall within the scope of protection of this application.

[0047] It should be noted that the terms "first", "second", etc. in the specification and claims of this application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so as to describe the embodiments of the present application described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or apparatuses.

[0048] The present invention will be further described below with reference to the accompanying drawings.

[0049] like Figure 1-2 and Figure 9 As shown, the positive pressure sonic nozzle air flow detection equipment of the present invention includes an air compressor 1, a delivery connecting pipe 2, a filter 4, an automatic alignment and adding device 6, a flow meter 7, an extrusion alignment device 8, a first sealing butt joint 9, a second sealing butt joint 10, a sonic nozzle 11, a support frame 12 and a buffer container 14, the delivery connecting pipe 2 is fixedly connected to the air compressor 1, the filter 4 is arranged on the outside of the air compressor 1, and the delivery connecting pipe 2 is fixedly connected to both ends of the filter 4, the buffer container 14 is fixedly arranged on the side of the filter 4 away from the air compressor 1 through the delivery connecting pipe 2, the support frame 12 is fixedly connected to the delivery connecting pipe 2 arranged on the side of the buffer container 14 away from the filter 4, the sonic nozzle 11 is arranged on the delivery connecting pipe 2 arranged at one end of the buffer container 14 away from the filter 4, the extrusion alignment device 8 is arranged at the end of the delivery connecting pipe 2 away from the air compressor 1, the first sealing butt joint 9 is arranged on the extrusion alignment device 8, the second sealing butt joint 10 is fixedly connected to the delivery connecting pipe 2 through the delivery connecting pipe 2. The delivery connecting pipe 2 is fixedly connected to the sonic nozzle 11, the flowmeter 7 is fixedly arranged between the second sealed butt joint pipe 10 and the first sealed butt joint pipe 9, the automatic alignment and adding device 6 is arranged on the outside of the second sealed butt joint pipe 10 and the first sealed butt joint pipe 9, and the first flow velocity sensor 3 and the second flow velocity sensor 5 are fixedly installed on the delivery connecting pipe 2 at both ends of the filter 4. The delivery connecting pipe 2 set at both ends of the buffer container 14 is fixedly installed with a proportional regulating valve 13. The first flow velocity sensor 3 and the second flow velocity sensor 5 can be accurately detected and judged by the set first flow velocity sensor 3 and the second flow velocity sensor 5, so as to facilitate automatic and accurate judgment of the blockage inside the filter 4, and the filter element 16 inside the filter 4 can be removed, cleaned or replaced in time and conveniently, so that the filter 4 can always have a good filtering effect, remove particulate matter, oil mist and moisture in the gas, and ensure that the detection can be carried out accurately. The set proportional regulating valve 13 can dynamically adjust the intake volume to maintain pressure stability.

[0050] like Figure 3-4 As shown, the filter 4 includes a filter tank 15, a filter element 16, a sealing card plate 17 and a first support base 18. The sealing card plate 17 is fixedly installed on the end of the filter tank 15 by bolts. The filter element 16 is evenly arranged inside the filter tank 15. The first support base 18 is fixedly connected to the bottom end of the filter tank 15. Fixed connecting columns 20 are evenly fixedly installed between the edges of the filter element 16. The sliding card plate 19 is evenly fixedly connected to the two ends of the filter element 16, and the sliding card plate 19 is slidably clamped on the filter tank 15.

[0051] like Figure 5As shown, the buffer container 14 includes a pressure sensor 21, a solenoid valve 22, a buffer tank 23, a pressure gauge 24 and a second support base 25. The solenoid valve 22 is symmetrically fixedly installed in the middle of the upper end and the bottom end of the buffer tank 23. The pressure sensor 21 and the pressure gauge 24 are arranged on the buffer tank 23. The second support base 25 is fixedly connected to the bottom end of the buffer tank 23. The pressure sensor 21 can be used to detect the pressure inside the buffer tank 23, and the pressure gauge 24 can be used to display the pressure inside the buffer tank 23 for easy observation. When the pressure is too high, the symmetrically distributed solenoid valves 22 play a role in pressure relief, thereby realizing the delivery of stable airflow and facilitating accurate detection.

[0052] like Figure 6-7 As shown, the automatic alignment adding device 6 includes a rotating adjustment toothed disc 26, a driving gear 27, a third support base 28, a rotating adjustment disc 29, a support adjustment arm 30, a clamping limit ring 31, a first electric push rod 32 and a support bracket 33. The middle parts of both sides of the rotating adjustment disc 29 are rotatably clamped in the upper end of the third support base 28, the rotating adjustment toothed disc 26 is rotatably clamped on both sides of the upper end of the third support base 28, and the middle part of the rotating adjustment toothed disc 26 is fixedly connected to the middle part of the rotating adjustment disc 29, the support adjustment arm 30 is evenly fixedly mounted on the rotating adjustment disc 29, and the support adjustment arm 30 is provided with six, the driving gear 27 is rotatably mounted on both sides of the third support base 28, and the two driving gears 27 are respectively located at the bottom ends of the rotating adjustment toothed disc 26, and the driving gear 27 is meshed with the rotating adjustment toothed disc 26, the motor 34 is fixedly mounted on the third support base 28, the driving end of the motor 34 is fixedly connected to the middle part of the driving gear 27, the middle parts of the two driving gears 27 The support adjustment arm 30 is fixedly connected by a synchronous rod, and a support bracket 33 is symmetrically fixedly installed on the support adjustment arm 30. The first electric push rod 32 is fixedly installed on the support bracket 33, and the fixing limit ring 31 is symmetrically fixedly connected to the front end of the first electric push rod 32. The flow meter 7 is fixedly arranged between the symmetrically distributed fixing limit rings 31. During the continuous detection of multiple flow meters 7, after the flow meter 7 is removed by the mechanical arm after the detection is completed, the motor 34 in the automatic alignment and adding device 6 can automatically operate to drive the driving gear 27 to rotate, so that the rotating driving gear 27 drives the rotating adjusting disk 29 to rotate by rotating the adjusting toothed disk 26. The rotating rotating adjusting disk 29 rotates the flow meter 7 fixed between the fixing limit rings 31 by the support adjustment arm 30 to rotate the specified angle and move to between the first sealing butt joint 9 and the second sealing butt joint 10, thereby realizing automatic and accurate replenishment and addition of the flow meter 7 to be detected, so that multiple flow meters 7 can be continuously and efficiently detected.

[0053] like Figure 8As shown, the extrusion alignment device 8 includes a fixing frame 35, a second electric push rod 36, an extrusion push plate 37, a buffer spring 38, an extrusion fixed plate 39 and a fourth support base 41. The fixing frame 35 is fixedly connected to the upper end of the fourth support base 41, the second electric push rod 36 is evenly fixed on the fixing frame 35, the extrusion push plate 37 is fixedly connected to the front end of the second electric push rod 36, the buffer spring 38 is evenly fixedly connected to the side end of the extrusion push plate 37 away from the second electric push rod 36, the extrusion fixed plate 39 is fixedly connected to the side end of the buffer spring 38 away from the extrusion push plate 37, and the extrusion fixed plate 39 is fixedly installed on the first sealing butt joint 9. The extrusion alignment device 8 is set up, and the flow meter 7 to be tested can be automatically squeezed, sealed, and locked. The buffer spring 38 is set up to ensure that sufficient extrusion force is achieved between the extrusion fixed plate 39 and the first sealing butt joint 9 and the flow meter 7 and the second sealing butt joint 10, and can fully protect the flow meter 7 to be tested. The buffering of the buffer spring 38 ensures that the flow meter 7 will not be damaged during the extrusion and locking process.

[0054] The ends of the first sealing butt joint pipe 9 and the second sealing butt joint pipe 10 are inserted into the connection ends at both ends of the flow meter 7 through sealing rubber rings, so that the flow meter 7 to be tested can be sealed.

[0055] The first sealed butt joint pipe 9 and the second sealed butt joint pipe 10 are at the same level. A temperature sensor is provided on the buffer tank 23 to accurately monitor the gas temperature.

[0056] Working principle: Start the air compressor 1 in the air source system, connect the filter 4, the second flow rate sensor 5, the buffer container 14 and the proportional control valve 13 in sequence through the delivery connecting pipe 2 to form a stable pressure air source, and fix the flow meter 7 to be tested between the first sealed butt joint pipe 9 and the second sealed butt joint pipe 10, and confirm that the temperature sensor, pressure sensor 21 and the industrial computer data acquisition system are connected normally to ensure that the data collection is correct. During the detection process, the flow meter 7 to be monitored is first evenly fixed and placed in the automatic alignment and adding device 6. First, the symmetrically distributed first electric push rod 32 in the automatic alignment and adding device 6 is started to drive the symmetrically distributed fixed limit ring 31 to open, and the flow meter 7 is placed between the fixed limit ring 31. Then, the symmetrically distributed first electric push rods 32 drive the synchronous movement of the clamping limit rings 31 to clamp the flow meter 7 between the clamping limit rings 31, and an automatic alignment adding device 6 can evenly clamp and set six flow meters 7. When the flow meter 7 located between the first sealing butt joint 9 and the second sealing butt joint 10 is detected and removed, the starting motor 34 can drive the bottom driving gear 27 to rotate a specified angle, so that the rotating driving gear 27 can drive the rotating adjustment gear disk 26 to rotate, so that the flow meter 7 clamped between the clamping limit rings 31 is rotated to between the first sealing butt joint 9 and the second sealing butt joint 10, and at this time, the connection ends on both sides of the flow meter 7 are aligned with the end heads of the first sealing butt joint 9 and the second sealing butt joint 10. The symmetrically distributed first electric push rods 32 are then started to cancel the squeezing force between the clamping limit ring 31 and the flow meter 7 in a small range, so that the symmetrically distributed clamping limit ring 31 can limit the flow meter 7 but will not lock the flow meter 7. Then the second electric push rods 36 in the squeezing alignment device 8 are started, and the evenly distributed second electric push rods 36 can synchronously squeeze the end of the squeezing push plate 37, so that the squeezing push plate 37 squeezes the buffer spring 38 and the squeezing fixed plate 39, and finally squeezes the first sealing butt joint 9, so that the first sealing butt joint 9 clamps the flow meter 7 between the first sealing butt joint 9 and the second sealing butt joint 10, and the rubber ring inside the plug-in end of the first sealing butt joint 9 and the second sealing butt joint 10 can make the inspected The two ends of the flow meter 7 to be measured are sealed and fixedly connected with the first sealing butt joint 9 and the second sealing butt joint 10, so that accurate detection can be achieved, and the buffer spring 38 can ensure that sufficient extrusion force is achieved between the extrusion fixing disk 39 and the first sealing butt joint 9 and the flow meter 7 and the second sealing butt joint 10, and can fully protect the flow meter 7 to be measured. The buffering of the buffer spring 38 ensures that the flow meter 7 will not be damaged during the extrusion and fixing process. During the monitoring process, the pressure sensor 21 can be used to detect the pressure inside the buffer tank 23, and the pressure gauge 24 can be used to display the pressure inside the buffer tank 23 for easy observation. When the pressure is too high, the solenoid valves 22 arranged symmetrically play a role in pressure relief.Achieve stable airflow and facilitate accurate detection;

[0057] During the continuous testing of multiple flow meters 7, after the flow meter 7 is removed by the robotic arm after the test, the motor 34 in the automatic alignment and adding device 6 can automatically operate to drive the driving gear 27 to rotate, so that the rotating driving gear 27 drives the rotating adjustment disk 29 to rotate by rotating the adjusting toothed disk 26, and the rotating adjusting disk 29 rotates the flow meter 7 fixed between the fixing limit ring 31 by a specified angle through the supporting adjustment arm 30 to move between the first sealing butt joint pipe 9 and the second sealing butt joint pipe 10, thereby realizing automatic and accurate replenishment and addition of the flow meter 7 to be tested, so that multiple flow meters 7 can be tested continuously and efficiently;

[0058] By setting up the first flow velocity sensor 3 and the second flow velocity sensor 5, the flow velocity changes of the airflow at both ends of the filter 4 can be accurately detected and judged, thereby facilitating automatic and accurate judgment of the blockage situation inside the filter 4, and the filter element 16 inside the filter 4 can be removed, cleaned or replaced in a timely and convenient manner, so that the filter 4 can always have a good filtering effect, remove particulate matter, oil mist and moisture in the gas, and ensure that the detection can be carried out accurately.

[0059] The filter element 16 usually adopts a multi-layer composite structure. The outer protective layer is usually stainless steel. The internal filter layers are a pre-filter layer and a main filter layer. The pre-filter layer is made of melt-blown polypropylene, which can intercept large particles. The main filter layer is made of glass fiber or PTFE microporous membrane, which can efficiently intercept fine particles.

[0060] Glass fiber: diameter 0.5-5μm, temperature resistance above 200℃, porosity ≥90%, filtration efficiency up to 99.99% for 0.3μm particles;

[0061] PTFE microporous membrane: pore size 0.1-1μm, strong hydrophobicity, suitable for oil mist filtration;

[0062] Meltblown polypropylene: Fiber diameter 1-10μm, adsorption capacity enhanced by electrostatic electret treatment.

[0063] The preparation process of the filter element includes the following steps:

[0064] S1. Raw material pretreatment

[0065] Material slitting: Slice stainless steel mesh, meltblown PP, glass fiber, etc. into coils according to the designed size;

[0066] Surface treatment: Plasma activation of PTFE membrane to enhance interlayer bonding;

[0067] S2, laminated composite

[0068] Sequential layering: stack the outer stainless steel mesh → melt-blown PP pre-filter layer → glass fiber or PTFE main filter layer → polyester support layer in sequence;

[0069] Hot pressing and shaping: The temperature of the hot roller press is controlled at 180-220℃ and the pressure is controlled at 0.5-1.2MPa to make each layer bonded to form a composite filter material;

[0070] S3, folding or winding

[0071] Pleating process: Use a CNC pleating machine to fold the composite filter material into a wave shape, with a pleat height of 5-15mm and pleat number of 50-200 / m to increase the filtration area;

[0072] Winding: For cylindrical filter elements, the filter material is spirally wound on a central skeleton made of ABS or metal;

[0073] S4, end cap packaging

[0074] End cap bonding: Use epoxy resin or polyurethane adhesive to bond the metal or plastic end cap to the filter material, with a curing temperature of 60-80°C and a curing time of 2-4 hours;

[0075] Sealing treatment: Apply silicone sealing ring at the joint between the end cap and the filter material to ensure air tightness;

[0076] S5. Post-processing and testing

[0077] Electret treatment for PP filter materials: a high voltage electric field of 15-25kV is applied through corona discharge equipment to make the fiber electrostatic and enhance the adsorption efficiency;

[0078] Integrity test: Bubble point test: After soaking the filter element, pressurize it to 0.2-0.3MPa, observe the bubble point to determine whether the maximum pore size meets the requirements;

[0079] Particle challenge test: introduce standard dust to verify filtration efficiency.

[0080] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A positive pressure sonic nozzle air flow detection device, comprising an air compressor (1), a delivery connecting pipe (2), a filter (4), an automatic alignment and adding device (6), a flow meter (7), an extrusion alignment device (8), a first sealing butt joint pipe (9), a second sealing butt joint pipe (10), a sonic nozzle (11), a support frame (12), and a buffer container (14), characterized in that: The delivery connecting pipe (2) is fixedly connected to the air compressor (1), the filter (4) is arranged outside the air compressor (1), and the delivery connecting pipe (2) is fixedly connected to both ends of the filter (4), the buffer container (14) is fixedly arranged on the side of the filter (4) away from the air compressor (1) through the delivery connecting pipe (2), the support frame (12) is fixedly connected to the delivery connecting pipe (2) arranged on the side of the buffer container (14) away from the filter (4), and the sonic nozzle (11) is arranged on the side of the buffer container (14) away from the filter (4). ) is arranged on one end of the delivery connecting pipe (2), the extrusion alignment device (8) is arranged at the end of the delivery connecting pipe (2) away from the air compressor (1), the first sealing butt joint pipe (9) is arranged on the extrusion alignment device (8), the second sealing butt joint pipe (10) is fixedly connected to the sonic nozzle (11) through the delivery connecting pipe (2), the flow meter (7) is fixedly arranged between the second sealing butt joint pipe (10) and the first sealing butt joint pipe (9), and the automatic alignment adding device (6) is arranged on the outside of the second sealing butt joint pipe (10) and the first sealing butt joint pipe (9).

2. The positive pressure sonic nozzle air flow detection device according to claim 1, characterized in that: A first flow rate sensor (3) and a second flow rate sensor (5) are fixedly mounted on the delivery connecting pipes (2) at both ends of the filter (4), and a proportional regulating valve (13) is fixedly mounted on the delivery connecting pipes (2) arranged at both ends of the buffer container (14).

3. The positive pressure sonic nozzle air flow detection device according to claim 2, characterized in that: The filter (4) comprises a filter tank (15), a filter element (16), a sealing card plate (17), a first supporting base (18) and a sliding card plate (19); the sealing card plate (17) is fixedly mounted on the end of the filter tank (15) by means of bolts; the filter element (16) is evenly arranged inside the filter tank (15); the first supporting base (18) is fixedly connected to the bottom end of the filter tank (15); fixed connecting columns (20) are evenly fixedly mounted between the edges of the filter element (16); the sliding card plate (19) is evenly fixedly connected to the two ends of the filter element (16), and the sliding card plate (19) is slidably clamped on the filter tank (15).

4. The positive pressure sonic nozzle air flow detection device according to claim 3, characterized in that: The buffer container (14) comprises a pressure sensor (21), a solenoid valve (22), a buffer tank (23), a pressure gauge (24) and a second support base (25); the solenoid valve (22) is symmetrically fixedly mounted at the middle of the upper end and the bottom end of the buffer tank (23); the pressure sensor (21) and the pressure gauge (24) are arranged on the buffer tank (23); and the second support base (25) is fixedly connected to the bottom end of the buffer tank (23).

5. The positive pressure sonic nozzle air flow detection device according to claim 4, characterized in that: The automatic alignment adding device (6) comprises a rotating adjustment toothed disc (26), a driving gear (27), a third support base (28), a rotating adjustment disc (29), a support adjustment arm (30), a clamping limit ring (31), a first electric push rod (32), a support bracket (33) and a motor (34). The middle parts of both sides of the rotating adjustment disc (29) are rotatably clamped inside the upper end of the third support base (28). The rotating adjustment toothed disc (26) is rotatably clamped on both sides of the upper end of the third support base (28), and the middle part of the rotating adjustment toothed disc (26) is fixedly connected to the middle part of the rotating adjustment disc (29). The support adjustment arm (30) is evenly fixedly mounted on the rotating adjustment disc (29), and six support adjustment arms (30) are provided. The driving gear (27) is rotatably mounted on the rotating adjustment disc (29). On both sides of the third support base (28), the two driving gears (27) are respectively located at the bottom ends of the rotation adjustment toothed disc (26), and the driving gears (27) are meshed with the rotation adjustment toothed disc (26). The motor (34) is fixedly mounted on the third support base (28), the driving end of the motor (34) is fixedly connected to the middle of the driving gear (27), and the middle parts of the two driving gears (27) are fixedly connected through a synchronization rod. A support bracket (33) is symmetrically fixedly mounted on the support adjustment arm (30), a first electric push rod (32) is fixedly mounted on the support bracket (33), and the clamping limiting ring (31) is symmetrically fixedly connected to the front end of the first electric push rod (32). A flow meter (7) is clamped and arranged between the symmetrically distributed clamping limiting rings (31).

6. The positive pressure sonic nozzle air flow detection device according to claim 5, characterized in that: The extrusion alignment device (8) comprises a fixed frame (35), a second electric push rod (36), an extrusion push plate (37), a buffer spring (38), an extrusion fixed plate (39) and a fourth support base (41), wherein the fixed frame (35) is fixedly connected to the upper end of the fourth support base (41), the second electric push rod (36) is evenly fixedly mounted on the fixed frame (35), the extrusion push plate (37) is fixedly connected to the front end of the second electric push rod (36), the buffer spring (38) is evenly fixedly connected to the side end of the extrusion push plate (37) away from the second electric push rod (36), the extrusion fixed plate (39) is fixedly connected to the side end of the buffer spring (38) away from the extrusion push plate (37), and the extrusion fixed plate (39) is fixedly mounted on the first sealing butt joint pipe (9).

7. The positive pressure sonic nozzle air flow detection device according to claim 6, characterized in that: The ends of the first sealing butt joint pipe (9) and the second sealing butt joint pipe (10) are inserted into the connection ends at both ends of the flow meter (7) through sealing rubber rings.

8. The positive pressure sonic nozzle air flow detection device according to claim 7, characterized in that: The first sealed butt joint pipe (9) and the second sealed butt joint pipe (10) are at the same level, and a temperature sensor is provided on the buffer tank (23).

9. The positive pressure sonic nozzle air flow detection device according to claim 8, characterized in that: The filter element (16) adopts a multi-layer composite structure, the outer protective layer is stainless steel, the internal filter layers are respectively a pre-filter layer and a main filter layer, the pre-filter layer is made of melt-blown polypropylene, and the main filter layer is made of glass fiber.

Images