Corrosion-resistant hydrogen chloride differential pressure flowmeter and method of installing same

Abstract

The application discloses a corrosion-proof hydrogen chloride differential pressure flowmeter and a mounting method thereof. The differential pressure flowmeter comprises a throttling assembly, the throttling assembly comprises a front straight pipe section, a rear straight pipe section and a throttling orifice plate, the straight pipe sections are provided with positive pressure taking devices and negative pressure taking devices, the pipe flanges of the front straight pipe section and the rear straight pipe section are connected through a stud bolt, and the stud bolt is threadedly connected with a nut one. The positive pressure taking devices and the negative pressure taking devices are both welded with pressure taking flanges, and the throttling orifice plate is arranged between the positive pressure taking devices and the negative pressure taking devices. The method comprises the following steps: a, mounting a clamping structure; b, mounting an adjusting frame; c, mounting the front straight pipe section and the rear straight pipe section on a mounting support; d, cleaning the front straight pipe section and the rear straight pipe section; e, adjusting the front straight pipe section and the rear straight pipe section to a horizontal position; f, mounting the throttling orifice plate; and f, welding the pressure taking flanges. The throttling orifice plate can be conveniently replaced, and the measurement accuracy of the differential pressure flowmeter is ensured.

Description

Technical Field

[0001] This invention belongs to the field of differential pressure flow meter technology, specifically relating to a corrosion-resistant hydrogen chloride differential pressure flow meter and its installation method. Background Technology

[0002] Differential pressure flow meters utilize the principle that there is a relationship between the pressure difference generated when a fluid flows through a throttling component and the flow rate. The flow rate is determined by measuring the pressure difference. The fluid density is required for flow rate calculation; this specific value is provided by the manufacturer. Hydrogen chloride differential pressure flow meters are primarily used in the chlor-alkali chemical industry to measure the flow rate of hydrogen chloride gas.

[0003] The prior art discloses a utility model patent entitled "Orifice Plate Differential Pressure Flow Meter" (authorization announcement number: CN217210985U), in which the throttling component includes a tube seat and a throttling orifice plate. The two ends of the tube seat are respectively connected to a pipe through which fluid flows. The throttling orifice plate is located inside the tube seat. The tube seat is provided with a positive pressure side pressure tap and a negative pressure side pressure tap, which are respectively located on both sides of the throttling orifice plate.

[0004] It is evident that the orifice plate in the existing technology is fixed inside the pipe seat. During long-term use, hydrogen chloride fluid will corrode the orifice plate. The orifice plate in the existing technology cannot be replaced, which easily leads to technical problems such as inaccurate measurement in differential pressure flow meters. Summary of the Invention

[0005] The purpose of this invention is to solve the aforementioned technical problems existing in the prior art, and to provide a corrosion-resistant hydrogen chloride differential pressure flow meter and its installation method. The straight pipe section is divided into a front straight pipe section and a rear straight pipe section. The front straight pipe section is used to install a positive pressure tapping device, and the rear straight pipe section is used to install a negative pressure tapping device. A throttling orifice plate is located between the positive and negative pressure tapping devices. Using a double-ended stud and nut, the front and rear straight pipe sections can be detachably connected, facilitating the installation or removal of the throttling orifice plate between them, making it easy to replace with a new throttling orifice plate, and ensuring the accuracy of the differential pressure flow meter measurement.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] A corrosion-resistant hydrogen chloride differential pressure flow meter includes a throttling component, which comprises a straight pipe section and a throttling orifice plate. The orifice plate has throttling holes. Both ends of the straight pipe section are connected to pipes through which fluid flows. The orifice plate is installed inside the straight pipe section. The straight pipe section is equipped with a positive pressure tapping device and a negative pressure tapping device. The key feature is that the straight pipe section consists of a front straight pipe section and a rear straight pipe section. The positive pressure tapping device is installed on the front straight pipe section, and the negative pressure tapping device is installed on the rear straight pipe section. The pipe flanges of the front and rear straight pipe sections are connected by double-ended studs. A nut is threaded onto the double-ended studs, and the nut locks and fixes the front and rear straight pipe sections. A flat washer may also be placed between the double-ended studs and the nut. The double-ended studs and the nut constitute a fastener. Both the positive pressure tapping device and the negative pressure tapping device are welded with pressure tapping flanges. The pressure tapping flange of the positive pressure tapping device is provided with a positive pressure tapping port, and the pressure tapping flange of the negative pressure tapping device is provided with a negative pressure tapping port. The throttling orifice plate is located between the positive pressure tapping device and the negative pressure tapping device.

[0008] This invention divides the straight pipe section into two parts: a front straight pipe section and a rear straight pipe section. The front straight pipe section is used to install a positive pressure tapping device, and the rear straight pipe section is used to install a negative pressure tapping device. A throttling orifice plate is located between the positive pressure tapping device and the negative pressure tapping device. By using a double-ended stud and nut, the front and rear straight pipe sections can be detachably connected, facilitating the installation or removal of the throttling orifice plate between the two sections. This also facilitates the replacement of a new throttling orifice plate and ensures the accuracy of the differential pressure flow meter measurement.

[0009] Furthermore, both the positive pressure tapping device and the negative pressure tapping device include a main body, which is made of stainless steel. A PFA liner is provided at the contact point between the main body and the hydrogen chloride phase. The PFA liner is resistant to organic solvent corrosion, which improves the differential pressure flow meter's resistance to chemical corrosion and thus ensures measurement accuracy.

[0010] Furthermore, a notch is formed between the positive pressure tapping device and the negative pressure tapping device, and the orifice plate is fixed in the notch, which improves the firmness and sealing of the orifice plate in the installation between the positive pressure tapping device and the negative pressure tapping device.

[0011] Furthermore, a connecting plate is provided between the positive pressure tapping device and the negative pressure tapping device. The connecting plate is fixedly connected to the positive pressure tapping device by screws, and the connecting plate is fixedly connected to the negative pressure tapping device by screws, which increases the firmness of the connection between the positive pressure tapping device and the negative pressure tapping device and increases the stability of the throttling orifice plate.

[0012] The installation method of the corrosion-resistant hydrogen chloride differential pressure flow meter is characterized by: using a docking device to align and install the upstream and downstream straight pipe sections. The docking device includes a docking platform and a movable docking structure. Two sets of movable docking structures are symmetrically installed on the docking platform. The movable docking structure includes a mounting bracket and a cylinder. The cylinder is fixed to the bottom surface of the docking platform. The docking platform is provided with a track, and the mounting bracket is located on the track. The cylinder is connected to the mounting bracket through a connecting plate. The cylinder drives the mounting bracket to move along the length of the docking platform on the track, changing the distance between the two mounting brackets. Specifically, the method includes the following steps:

[0013] a. Install clamping structures on the front and rear straight pipe sections:

[0014] The clamping structure includes two clamping plates. The front straight pipe section and the rear straight pipe section are placed on the ground. Two clamping plates are installed on the front straight pipe section or the rear straight pipe section, and the clamping plates are controlled to be at the same height. Then, a threaded rod is set between the two clamping plates. Nut 2 is screwed into the threaded rod and tightened. The clamping structure is used to clamp and fix the front straight pipe section or the rear straight pipe section.

[0015] b. Install the adjustment bracket:

[0016] The adjusting frame includes a U-shaped base and a fixing plate. The fixing plate is welded into the groove of the U-shaped base. The U-shaped base is placed into the recess of the mounting bracket, and a rotating shaft is inserted into the through hole of the mounting bracket. The rotating shaft is then screwed into the threaded hole of the U-shaped base, and a nut is screwed onto the rotating shaft to keep the U-shaped base horizontal. Finally, the nut is tightened. The adjusting frame, with its clamping structure, allows for the flipping of either the front or rear straight pipe section.

[0017] c. Install the front and rear straight pipe sections onto the mounting bracket:

[0018] Insert bolts into the ear plates and fixing plates on both sides of the clamping structure, then insert nuts four into the bolts and tighten them. At this time, the front and rear straight pipe sections remain vertical, and the pipe flanges of the front and rear straight pipe sections are set upwards. The vertical front and rear straight pipe sections facilitate cleaning of the front and rear straight pipe sections later.

[0019] d. Clean the upstream and downstream straight pipe sections:

[0020] A water tank is installed on the docking platform, positioned below the front straight pipe section. Another water tank is positioned below the rear straight pipe section. Cleaning fluid is then used to clean both the front and rear straight pipe sections. The cleaning fluid is collected in the water tanks and discharged uniformly. The cleaning fluid flows down the front and rear straight pipe sections, removing impurities and facilitating the later installation of positive and negative pressure tapping devices.

[0021] e. Adjust the front and rear straight pipe sections to a horizontal position:

[0022] After the front and rear straight pipe sections have dried, remove the water tank from the docking platform. Loosen nut three, rotate the shaft 90° on the mounting bracket to ensure the front and rear straight pipe sections are horizontal, and then tighten nut three. Maintaining the horizontal position of the front and rear straight pipe sections facilitates the insertion of double-ended studs into the flanges of both sections later, allowing for secure fixing.

[0023] f. Install the orifice plate:

[0024] The positive pressure tapping device and the negative pressure tapping device are equipped with pressure tapping flanges. The positive pressure tapping device is welded to the front straight pipe section, and the negative pressure tapping device is welded to the rear straight pipe section. Then, the orifice plate is placed between the positive pressure tapping device and the negative pressure tapping device. Then, the cylinder is activated, and the cylinder controls the mounting bracket to move a set distance on the track, so that the positive pressure tapping device and the negative pressure tapping device fix the orifice plate. Then, double-ended studs are inserted into the pipe flanges of the front straight pipe section and the pipe flanges of the rear straight pipe section. Then, nut one is screwed into the double-ended studs and tightened. Nut one locks and fixes the front straight pipe section and the rear straight pipe section, so that the front straight pipe section, the rear straight pipe section, the positive pressure tapping device, the negative pressure tapping device and the orifice plate are connected into an integral unit. The positioning and clamping mechanism of the cylinder keeps the front and rear straight pipe sections in their designated positions, facilitating the horizontal installation of double-ended studs and nuts. This ensures a secure lock on the nuts, increasing the stability of both the front and rear straight pipe sections. Furthermore, it facilitates the subsequent stable welding of the pressure tapping flange.

[0025] g. Welding the pressure tapping flange:

[0026] Unscrew the fourth bolt and nut on the left side, then loosen the fourth nut on the bolt on the right side. Rotate the entire unit to the set angle. Next, place the pad on the U-shaped base and support the entire unit on the pad, ensuring the pressure tapping flange on the positive pressure tapping device remains vertical. Weld the pressure tapping flange and the positive pressure tapping device together. Remove the pad and reset the entire unit. Then, screw in the fourth bolt and nut on the left side, leaving the fourth nut loose. Unscrew the fourth bolt and nut on the right side and rotate the entire unit to the set angle. Place the pad on the U-shaped base again and support the entire unit on the pad, ensuring the pressure tapping flange on the negative pressure tapping device remains vertical. Weld the pressure tapping flange and the negative pressure tapping device together. Remove the pad, unscrew the fourth bolt and nut on the left side, and remove the welded entire unit.

[0027] The purpose of this operation is to keep the pressure tapping flanges on the positive pressure tapping device or the negative pressure tapping device vertical, keep the contact points of the pressure tapping flanges balanced, apply welds evenly to the contact points of the pressure tapping flanges, increase the strength of the pressure tapping flange welds, improve production safety, and promptly prevent safety and quality accidents from occurring.

[0028] Furthermore, in step a, it is necessary to control the clamping structure to be at the same height on both the front and rear straight pipe sections. The specific steps are as follows:

[0029] (1) Place the pipe flanges of the front straight pipe section and the rear straight pipe section on the ground, maintain a set distance between the front straight pipe section and the rear straight pipe section, and place the front straight pipe section and the rear straight pipe section in a row.

[0030] (2) Place a support frame on the ground. The support frame is equipped with several support plates. The support plates are supported on the pipe flanges of the front straight pipe section and the pipe flanges of the rear straight pipe section. When installing the clamp plate, support the clamp plate on the support plate so that the clamp plate on the front straight pipe section and the clamp plate on the rear straight pipe section are at the same height.

[0031] (3) After the clamping structure is installed, move the entire support frame horizontally out.

[0032] The clamping structures on the front and rear straight pipe sections are in the same position, thereby controlling the distance between the front and rear straight pipe sections after the later movement to the design distance, ensuring that the positive pressure tapping device and the negative pressure tapping device fix the throttling orifice plate.

[0033] Furthermore, in step b, the mounting bracket is equipped with an adjusting plate, and the adjusting plate is threadedly connected to an adjusting rod. After the adjusting bracket is installed, the adjusting rod is rotated so that it supports the U-shaped seat which is kept horizontal, thereby increasing the load-bearing capacity of the U-shaped seat and meeting the cleaning requirements of the front and rear straight pipe sections.

[0034] Furthermore, in step d, a U-shaped steel section is provided on the top surface of the docking platform. The U-shaped steel discharges wastewater along the length of the docking platform. During the installation of the water tank, a limiting protrusion at the bottom of the water tank engages with the track, while a limiting post at the bottom of the water tank enters the limiting hole of the docking platform. At this time, the drain outlet of the water tank is located in the steel channel of the U-shaped steel. This ensures the water tank is securely mounted on the docking platform, facilitates the collection of cleaning fluid in the water tank, and allows the cleaning fluid in the water tank to be discharged through the U-shaped steel along the length of the docking platform.

[0035] The present invention, by adopting the above-described technical solution, has the following beneficial effects:

[0036] (1) The present invention divides the straight pipe section into two parts: a front straight pipe section and a rear straight pipe section. The front straight pipe section is used to install a positive pressure tapping device, and the rear straight pipe section is used to install a negative pressure tapping device. The orifice plate is located between the positive pressure tapping device and the negative pressure tapping device. The front straight pipe section and the rear straight pipe section can be detachably connected by using a double-ended stud and a nut. This facilitates the installation or removal of the orifice plate between the front straight pipe section and the rear straight pipe section, makes it easy to replace the orifice plate with a new one, and ensures the accuracy of the differential pressure flow meter measurement.

[0037] (2) During the installation process, the present invention can switch the state of the front straight pipe section and the rear straight pipe section. When cleaning the front straight pipe section and the rear straight pipe section, the front straight pipe section and the rear straight pipe section remain in a vertical state, resulting in good cleaning effect and short drying time. When installing the orifice plate, the front straight pipe section and the rear straight pipe section remain in a horizontal state, which facilitates the limiting and welding of the positive pressure tapping device and the negative pressure tapping device. At the same time, the cylinder can be used to control the installation bracket to move a set distance on the track, so that the positive pressure tapping device and the negative pressure tapping device can fix the orifice plate.

[0038] When welding the pressure tapping flange, it can keep the pressure tapping flange on the positive pressure tapping device or the pressure tapping device vertical, keep the contact point of the pressure tapping flange balanced, apply the weld evenly to the contact point of the pressure tapping flange, increase the strength of the pressure tapping flange weld, improve production safety, and promptly avoid the occurrence of safety and quality accidents. Attached Figure Description

[0039] The present invention will be further described below with reference to the accompanying drawings:

[0040] Figure 1 This is a schematic diagram of the corrosion-resistant hydrogen chloride differential pressure flow meter of the present invention;

[0041] Figure 2 This is a schematic diagram of the internal structure of the corrosion-resistant hydrogen chloride differential pressure flow meter of the present invention;

[0042] Figure 3 This is a schematic diagram of the docking device in this invention;

[0043] Figure 4 for Figure 3 The main view;

[0044] Figure 5 This is a schematic diagram of the structure of the present invention when the clamping structure is at the same height in the front straight pipe section and the rear straight pipe section;

[0045] Figure 6 This is a schematic diagram of the clamping structure in this invention;

[0046] Figure 7 This is a schematic diagram of the adjustment frame in this invention;

[0047] Figure 8 This is a schematic diagram of the support frame in this invention;

[0048] Figure 9 This is a schematic diagram of the structure of the present invention when the adjustment frame is installed;

[0049] Figure 10 This is a schematic diagram of the present invention when the front straight pipe section and the rear straight pipe section are installed on the mounting bracket;

[0050] Figure 11 This is a schematic diagram of the structure of the present invention when cleaning the front straight pipe section and the rear straight pipe section;

[0051] Figure 12 This is a schematic diagram of the water tank structure in this invention;

[0052] Figure 13 This is a schematic diagram of the structure of the present invention when the cylinder-controlled mounting bracket moves on the track;

[0053] Figure 14 This is a schematic diagram of the present invention when the pressure tapping flange and the positive pressure tapping device are welded and fixed.

[0054] Figure 15 This is a schematic diagram of the present invention when the pressure tapping flange and the negative pressure tapping device are welded and fixed.

[0055] In the diagram, 1-front straight pipe section; 2-rear straight pipe section; 3-positive pressure tapping device; 4-negative pressure tapping device; 5-double-ended stud; 6-nut one; 7-pressure tapping flange; 8-throttle orifice plate; 9-connecting platform; 10-mounting bracket; 11-track; 12-cylinder; 13-adjusting plate; 14-leveling rod; 15-notch; 16-U-shaped steel; 17-steel channel; 18-clamping structure; 19-clamp plate; 20-support frame; 21-support plate; 22-pipe flange; 23-threaded rod; 24-nut two; 25-ear plate; 26-U-shaped seat; 27-fixing plate; 28-through hole; 29-threaded hole; 30-rotating shaft; 31-nut three; 32-water tank; 33-drain outlet; 34-limiting protrusion; 35-limiting post; 36-pad plate; 37-connecting plate. Detailed Implementation

[0056] like Figures 1 to 15 The diagram shows the corrosion-resistant hydrogen chloride differential pressure flow meter and its installation method according to the present invention. This corrosion-resistant hydrogen chloride differential pressure flow meter is used to measure the flow rate of (wet) hydrogen chloride gas in the chlor-alkali chemical industry.

[0057] The corrosion-resistant hydrogen chloride differential pressure flow meter includes a throttling component, which comprises a straight pipe section and a throttling orifice plate 8. The throttling orifice plate 8 has throttling holes, which are precisely machined according to the calculation requirements, with strict control over machining accuracy. Both ends of the straight pipe section are connected to pipelines through which fluid flows. The throttling orifice plate 8 is installed inside the straight pipe section, which is equipped with a positive pressure tapping device 3 and a negative pressure tapping device 4.

[0058] The straight pipe section consists of a front straight pipe section 1 and a rear straight pipe section 2. A positive pressure tapping device 3 is installed on the front straight pipe section 1, and a negative pressure tapping device 4 is installed on the rear straight pipe section 2. The pipe flange 22 of the front straight pipe section 1 and the pipe flange 22 of the rear straight pipe section 2 are connected by double-ended studs 5. Nuts 6 are threaded onto the double-ended studs 5, which lock and fix the front straight pipe section 1 and the rear straight pipe section 2. A flat washer can also be placed between the double-ended studs 5 and the nuts 6, forming a fastener. Both the positive pressure tapping device 3 and the negative pressure tapping device 4 are welded with tapping flanges 7. The tapping flange 7 at the positive pressure tapping device 3 has a positive pressure tapping port, and the tapping flange 7 at the negative pressure tapping device 4 has a negative pressure tapping port. A throttling orifice plate 8 is located between the positive pressure tapping device 3 and the negative pressure tapping device 4. This invention divides the straight pipe section into two parts: a front straight pipe section 1 and a rear straight pipe section 2. The front straight pipe section 1 is used to install a positive pressure tapping device 3, and the rear straight pipe section 2 is used to install a negative pressure tapping device 4. A throttling orifice plate 8 is located between the positive pressure tapping device 3 and the negative pressure tapping device 4. It is used in conjunction with a double-ended stud 5 and a nut 6 to allow for a detachable connection between the front straight pipe section 1 and the rear straight pipe section 2. This facilitates the installation or removal of the throttling orifice plate 8 between the front straight pipe section 1 and the rear straight pipe section 2, makes it easy to replace the throttling orifice plate 8 with a new one, and ensures the accuracy of the differential pressure flow meter measurement.

[0059] Both the positive pressure tapping device 3 and the negative pressure tapping device 4 include a body. The body is made of steel. A PFA liner is provided at the contact point between the body and the hydrogen chloride phase. The PFA liner is resistant to organic solvent corrosion, which improves the chemical corrosion resistance of the differential pressure flow meter and thus ensures the measurement accuracy. The specific inner diameter needs to be machined on a machine tool.

[0060] A notch is formed between the positive pressure tapping device 3 and the negative pressure tapping device 4, and the orifice plate 8 is fixed in the notch, improving the firmness and sealing of the orifice plate 8 between the positive pressure tapping device 3 and the negative pressure tapping device 4. A connecting plate is provided between the positive pressure tapping device 3 and the negative pressure tapping device 4. The connecting plate is fixedly connected to the positive pressure tapping device 3 by screws, and to the negative pressure tapping device 4 by screws, increasing the firmness of the connection between the positive pressure tapping device 3 and the negative pressure tapping device 4, and increasing the stability of the orifice plate 8.

[0061] A static pressure difference ΔP is generated before and after the flow meter, ΔP = P1 - P2. This pressure difference has a certain functional relationship with the flow rate; the larger the flow rate, the larger the pressure difference. The differential pressure signal is transmitted to the differential pressure transmitter, which converts it into a 4-20mA DC analog signal output and transmits it to the flow totalizer, thereby realizing the measurement of the hydrogen chloride gas flow rate.

[0062] The installation method of the corrosion-resistant hydrogen chloride differential pressure flow meter involves aligning and installing the front straight pipe section 1 and the rear straight pipe section 2 using a docking device. The docking device includes a docking platform 9 and a movable docking structure. Two sets of movable docking structures are symmetrically installed on the docking platform 9. The movable docking structure includes a mounting bracket 10 and a cylinder 12. The cylinder 12 is fixed to the bottom surface of the docking platform 9. The docking platform 9 has a track 11, and the mounting bracket 10 is mounted on the track 11. The cylinder 12 is connected to the mounting bracket 10 via a connecting plate 37. The cylinder 12 drives the mounting bracket 10 to move along the length of the docking platform 9 on the track 11, changing the distance between the two mounting brackets 10. The specific steps include:

[0063] a. Install clamping structure 18 on the front straight pipe section 1 and the rear straight pipe section 2:

[0064] The clamping structure 18 includes two clamping plates 19. The front straight pipe section 1 and the rear straight pipe section 2 are placed on the ground. Two clamping plates 19 are installed on the front straight pipe section 1 or the rear straight pipe section 2 to control the clamping plates 19 to be at the same height. Then, a threaded rod 23 is set between the two clamping plates 19. Nut 24 is screwed into the threaded rod 23 and tightened. The clamping structure 18 is used to clamp and fix the front straight pipe section 1 or the rear straight pipe section 2.

[0065] The clamping structure 18 needs to be positioned at the same height on both the front straight pipe section 1 and the rear straight pipe section 2. The specific steps are as follows:

[0066] (1) Place the pipe flange 22 of the front straight pipe section 1 and the pipe flange 22 of the rear straight pipe section 2 on the ground, maintain a set distance between the front straight pipe section 1 and the rear straight pipe section 2, and place the front straight pipe section 1 and the rear straight pipe section 2 in a row.

[0067] (2) Place a support frame 20 on the ground. The support frame 20 is made of rods welded together end to end. The support frame 20 is provided with several support plates 21. The support plates 21 are supported on the pipe flange 22 of the front straight pipe section 1 and the pipe flange 22 of the rear straight pipe section 2. When the clamp plate 19 is installed, the clamp plate 19 is supported on the support plate 21 so that the clamp plate 19 on the front straight pipe section 1 and the clamp plate 19 on the rear straight pipe section 2 are at the same height.

[0068] (3) After the clamping structure 18 is installed, the entire support frame 20 is moved out horizontally.

[0069] The clamping structures 18 on the front straight pipe section 1 and the rear straight pipe section 2 are in the same position, thereby controlling the distance between the front straight pipe section 1 and the rear straight pipe section 2 after the later movement to be the design distance, ensuring that the positive pressure tapping device 3 and the negative pressure tapping device 4 fix the throttling orifice plate 8.

[0070] b. Install the adjustment bracket:

[0071] The adjusting frame includes a U-shaped seat 26 and a fixing plate 27. The fixing plate 27 is welded into the groove of the U-shaped seat 26. The U-shaped seat 26 is placed into the recess 15 of the mounting bracket 10. A rotating shaft 30 is then inserted into the through hole 28 of the mounting bracket 10 and screwed into the threaded hole 29 of the U-shaped seat 26. A nut 31 is then screwed onto the rotating shaft 30 to keep the U-shaped seat 26 horizontal. Finally, the nut 31 is tightened. The adjusting frame is installed on the clamping structure 18, allowing the front straight pipe section 1 or the rear straight pipe section 2 to be flipped.

[0072] The mounting bracket 10 is equipped with an adjusting plate 13, which is threadedly connected to an adjusting rod 14. After the adjusting bracket is installed, the adjusting rod 14 is rotated so that it supports the U-shaped seat 26 which is kept horizontal, thereby increasing the load-bearing capacity of the U-shaped seat 26 and meeting the cleaning requirements of the front straight pipe section 1 and the rear straight pipe section 2.

[0073] c. Install the front straight pipe section 1 and the rear straight pipe section 2 onto the mounting bracket 10:

[0074] Insert bolts into the ear plates 25 and fixing plates 27 on both sides of the clamping structure 18, then insert nuts four into the bolts and tighten them. At this time, the front straight pipe section 1 and the rear straight pipe section 2 remain vertical. Meanwhile, the pipe flange 22 of the front straight pipe section 1 and the pipe flange 22 of the rear straight pipe section 2 are set upwards. The vertical front straight pipe section 1 and the rear straight pipe section 2 are convenient for cleaning in the later stage.

[0075] d. Clean the front straight pipe section 1 and the rear straight pipe section 2:

[0076] A water tank 32 is installed on the docking platform 9, positioned below the front straight pipe section 1. Another water tank 32 is positioned below the rear straight pipe section 2. Cleaning fluid is then used to clean both the front and rear straight pipe sections 1 and 2. The water tank 32 collects the cleaning fluid, which is then discharged uniformly. The cleaning fluid flows down the front and rear straight pipe sections 1 and 2, removing impurities and facilitating the later installation of the positive pressure tapping device 3 and the negative pressure tapping device 4.

[0077] A U-shaped steel 16 is provided on the top surface of the docking platform 9. The U-shaped steel 16 discharges wastewater along the length of the docking platform 9. When installing the water tank 32, the limiting protrusion 34 at the bottom of the water tank 32 is engaged with the track 11, and the limiting post 35 at the bottom of the water tank 32 passes into the limiting hole of the docking platform 9. At this time, the drain outlet 33 of the water tank 32 is located in the steel channel 17 of the U-shaped steel 16. This design securely holds the water tank 32 on the docking platform 9, facilitating the collection of cleaning fluid in the water tank 32 and allowing the cleaning fluid in the water tank 32 to be discharged along the length of the docking platform 9 through the U-shaped steel 16.

[0078] e. Adjust the front straight pipe section 1 and the rear straight pipe section 2 to a horizontal position:

[0079] After the front straight pipe section 1 and the rear straight pipe section 2 have dried, remove the water tank 32 from the docking platform 9, loosen the nut 31, and rotate the shaft 30 90° on the mounting bracket 10 to keep the front straight pipe section 1 and the rear straight pipe section 2 horizontal. Then tighten the nut 31. Keeping the front straight pipe section 1 and the rear straight pipe section 2 horizontal makes it easier to insert double-ended studs 5 into the pipe flange 22 of the front straight pipe section 1 and the pipe flange 22 of the rear straight pipe section 2 to fix the front straight pipe section 1 and the rear straight pipe section 2.

[0080] f. Install the orifice plate 8:

[0081] Pressure tapping flanges 7 are installed on the positive pressure tapping device 3 and the negative pressure tapping device 4. The positive pressure tapping device 3 is then welded to the front straight pipe section 1, and the negative pressure tapping device 4 is welded to the rear straight pipe section 2. Next, the orifice plate 8 is placed in the recess between the positive pressure tapping device 3 and the negative pressure tapping device 4. Then, the cylinder 12 is activated, and the cylinder 12 controls the mounting bracket 10 to move a set distance on the track 11, so that the positive pressure tapping device 3 and the negative pressure tapping device 4 fix the orifice plate 8. Then, double-ended studs 5 are inserted into the pipe flanges 22 of the front straight pipe section 1 and the pipe flanges 22 of the rear straight pipe section 2. Nuts 6 are then screwed into the double-ended studs 5 and tightened. Nuts 6 lock and fix the front straight pipe section 1 and the rear straight pipe section 2, so that the front straight pipe section 1, the rear straight pipe section 2, the positive pressure tapping device 3, the negative pressure tapping device 4, and the orifice plate 8 are connected into an integral unit. Under the positioning of cylinder 12 and the locking action of clamping structure 18, the front straight pipe section 1 and the rear straight pipe section 2 are kept in the set state, which facilitates the horizontal installation of double-ended studs 5 and nuts 6, making nuts 6 securely locked and increasing the stability of the front straight pipe section 1 and the rear straight pipe section 2. Moreover, it facilitates the stable welding of the pressure tapping flange 7 later.

[0082] f. Weld the pressure tapping flange 7:

[0083] Unscrew the bolt and nut four on the left side, then loosen the nut four on the bolt on the right side. Rotate the entire unit to the set angle. Next, place the pad 36 on the U-shaped seat 26 and support the entire unit on the pad 36, ensuring that the pressure tapping flange 7 on the positive pressure tapping device 3 remains vertical. Then, weld and fix the pressure tapping flange 7 and the positive pressure tapping device 3 (see reference). Figure 14 Then remove the pad 36 and reset the entire unit. Screw in the bolt and nut four on the left side, leaving the nut four loose. Then unscrew the bolt and nut four on the right side. Rotate the entire unit to the set angle. Next, place the pad 36 back onto the U-shaped seat 26 to support the entire unit, ensuring the pressure-sensing flange 7 on the negative pressure sensing device 4 remains vertical. Weld the pressure-sensing flange 7 and the negative pressure sensing device 4 together. Then remove the pad 36, unscrew the bolt and nut four on the left side, and remove the welded entire unit (see reference). Figure 15 ).

[0084] The purpose of this operation is to keep the pressure tapping flange 7 on the positive pressure tapping device 3 or the pressure tapping flange 7 on the negative pressure tapping device 4 in a vertical position, keep the contact point of the pressure tapping flange 7 balanced, apply welds evenly to the contact point of the pressure tapping flange 7, increase the weld strength of the pressure tapping flange 7, improve production safety, and promptly avoid the occurrence of safety and quality accidents.

[0085] The above are merely specific embodiments of the present invention, but the technical features of the present invention are not limited thereto. Any simple changes, equivalent substitutions, or modifications made based on the present invention to solve essentially the same technical problems and achieve essentially the same technical effects are all covered within the protection scope of the present invention.

Claims

1. An installation method for a corrosion-resistant hydrogen chloride differential pressure flow meter, characterized in that: The corrosion-resistant hydrogen chloride differential pressure flow meter includes: A throttling assembly, comprising a straight pipe section and a throttling orifice plate, wherein the throttling orifice plate is provided with throttling orifices, both ends of the straight pipe section are respectively connected to a pipe through which fluid flows, the throttling orifice plate is installed inside the straight pipe section, and the straight pipe section is provided with a positive pressure tapping device and a negative pressure tapping device; The straight pipe section consists of a front straight pipe section and a rear straight pipe section. The positive pressure tapping device is installed on the front straight pipe section, and the negative pressure tapping device is installed on the rear straight pipe section. The pipe flanges of the front straight pipe section and the rear straight pipe section are connected by double-ended studs. The double-ended studs are threaded with a nut, which locks and fixes the front straight pipe section and the rear straight pipe section. Both the positive pressure tapping device and the negative pressure tapping device are welded with pressure tapping flanges. The pressure tapping flange of the positive pressure tapping device is provided with a positive pressure tapping port, and the pressure tapping flange of the negative pressure tapping device is provided with a negative pressure tapping port. The throttling orifice plate is located between the positive pressure tapping device and the negative pressure tapping device. The installation method employs a docking device to align and install the front straight pipe section and the rear straight pipe section. The docking device includes a docking platform and a movable docking structure. Two sets of movable docking structures are symmetrically installed on the docking platform. Each movable docking structure includes a mounting bracket and a cylinder. The cylinder is fixed to the bottom surface of the docking platform. The docking platform is provided with a track, and the mounting bracket is located on the track. The cylinder is connected to the mounting bracket through a connecting plate. The cylinder drives the mounting bracket to move along the length of the docking platform on the track, changing the distance between the two mounting brackets. Specifically, the steps include the following: a. Install clamping structures on the front and rear straight pipe sections, the clamping structures including two clamping plates; In step a, it is necessary to control the clamping structure to be at the same height on the front and rear straight pipe sections, as follows: (1) Place the pipe flanges of the front straight pipe section and the rear straight pipe section on the ground, maintain a set distance between the front straight pipe section and the rear straight pipe section, and place the front straight pipe section and the rear straight pipe section in a row. (2) Place a support frame on the ground. The support frame is equipped with several support plates. The support plates are supported on the pipe flanges of the front straight pipe section and the pipe flanges of the rear straight pipe section. When installing the clamp plate, support the clamp plate on the support plate so that the clamp plate on the front straight pipe section and the clamp plate on the rear straight pipe section are at the same height. (3) After the clamping structure is installed, move the entire support frame out horizontally.

2. The installation method of the corrosion-resistant hydrogen chloride differential pressure flow meter according to claim 1, characterized in that: Both the positive pressure tapping device and the negative pressure tapping device include a body, which is made of stainless steel, and a PFA liner is provided at the contact point between the body and the hydrogen chloride phase.

3. The installation method of the corrosion-resistant hydrogen chloride differential pressure flow meter according to claim 1, characterized in that: A notch is formed between the positive pressure tapping device and the negative pressure tapping device, and the throttling orifice plate is fixed in the notch.

4. The installation method of the corrosion-resistant hydrogen chloride differential pressure flow meter according to claim 3, characterized in that: A connecting plate is provided between the positive pressure tapping device and the negative pressure tapping device. The connecting plate is fixedly connected to the positive pressure tapping device by screws, and the connecting plate is fixedly connected to the negative pressure tapping device by screws.

5. The installation method of the corrosion-resistant hydrogen chloride differential pressure flow meter according to claim 1, characterized in that: It also includes the following steps: b. Install the adjustment bracket: The adjustment frame includes a U-shaped seat and a fixing plate. The fixing plate is welded into the groove of the U-shaped seat. The U-shaped seat is placed into the recess of the mounting bracket. A rotating shaft is then inserted into the through hole of the mounting bracket and screwed into the threaded hole of the U-shaped seat. Nut three is then screwed into the rotating shaft to keep the U-shaped seat horizontal. Nut three is then tightened. c. Install the front and rear straight pipe sections onto the mounting bracket: Insert bolts into the ear plates and fixing plates on both sides of the clamping structure, then insert nuts four into the bolts and tighten nuts four. At this time, the front straight pipe section and the rear straight pipe section remain vertical, and the pipe flanges of the front straight pipe section and the rear straight pipe section are set upwards. d. Clean the upstream and downstream straight pipe sections: Install a water tank on the docking platform and place the water tank below the front straight pipe section. Place another water tank below the rear straight pipe section. Then use cleaning fluid to clean the front and rear straight pipe sections. The water tanks collect the cleaning fluid and discharge it uniformly. e. Adjust the front and rear straight pipe sections to a horizontal position: After the front and rear straight pipe sections are dry, remove the water tank from the docking platform, loosen nut three, rotate the shaft 90° on the mounting bracket to keep the front and rear straight pipe sections horizontal, and then tighten nut three. f. Install the orifice plate: The positive pressure tapping device and the negative pressure tapping device are equipped with pressure tapping flanges. The positive pressure tapping device is then welded to the front straight pipe section, and the negative pressure tapping device is welded to the rear straight pipe section. Next, the orifice plate is placed between the positive pressure tapping device and the negative pressure tapping device. Then, the cylinder is activated, and the cylinder controls the mounting bracket to move a set distance on the track, so that the positive pressure tapping device and the negative pressure tapping device fix the orifice plate. Then, double-ended studs are inserted into the pipe flanges of the front straight pipe section and the pipe flanges of the rear straight pipe section. Then, nut one is screwed into the double-ended studs and tightened. Nut one locks and fixes the front straight pipe section and the rear straight pipe section, so that the front straight pipe section, the rear straight pipe section, the positive pressure tapping device, the negative pressure tapping device and the orifice plate are connected into an integral unit. g. Welding the pressure tapping flange: Unscrew the fourth bolt and nut on the left side, then loosen the fourth nut on the bolt on the right side. Rotate the entire unit to the set angle. Next, place the pad on the U-shaped base and support the entire unit on the pad, ensuring the pressure tapping flange on the positive pressure tapping device remains vertical. Weld the pressure tapping flange and the positive pressure tapping device together. Remove the pad and reset the entire unit. Then, screw in the fourth bolt and nut on the left side, leaving the fourth nut loose. Unscrew the fourth bolt and nut on the right side and rotate the entire unit to the set angle. Place the pad on the U-shaped base again and support the entire unit on the pad, ensuring the pressure tapping flange on the negative pressure tapping device remains vertical. Weld the pressure tapping flange and the negative pressure tapping device together. Remove the pad, unscrew the fourth bolt and nut on the left side, and remove the welded entire unit.

6. The installation method of the corrosion-resistant hydrogen chloride differential pressure flow meter according to claim 5, characterized in that: In step b, the mounting bracket is equipped with an adjustment plate, and the adjustment plate is threadedly connected to an adjustment rod. After the adjustment bracket is installed, the adjustment rod is rotated so that the adjustment rod supports the U-shaped seat that is kept horizontal.

7. The installation method of the corrosion-resistant hydrogen chloride differential pressure flow meter according to claim 5, characterized in that: In step d, a U-shaped steel is provided on the top surface of the docking platform. The U-shaped steel discharges sewage along the length of the docking platform. When the water tank is installed, the limiting protrusion at the bottom of the water tank is locked on the track, and the limiting post at the bottom of the water tank is inserted into the limiting hole of the docking platform. At this time, the drain outlet of the water tank is located in the steel channel of the U-shaped steel.

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