Pneumatic valve stand for desuperheating water in thermal power plant

Abstract

The application discloses a kind of power plant desuperheating water pneumatic valve frame, it is related to power plant equipment technical field.The technical points are: including base, base is equipped with and dismantles component, base is connected together with the steel grating of field by and dismantles component can be detachable;The hollow sleeve pipe is welded to the top of base, a inner adjusting pipe is inserted in the hollow sleeve pipe, and the inner adjusting pipe and the hollow sleeve pipe are connected in vertical direction slidingly;Hollow sleeve is equipped with mounting bracket, and mounting bracket is equipped with installation hole for being connected with the control unit in pneumatic valve.The frame body of the application can provide installation basis for control unit in split type positioner in ideal position when positioning device of integrated pneumatic valve on pipeline in power plant is reformed, and control unit is installed by staff.

Description

Technical Field

[0001] This application relates to the field of thermal power plant equipment technology, and in particular to a pneumatic valve holder for desuperheating water in thermal power plants. Background Technology

[0002] Thermal power plant boilers employ a tightly sealed design (the main purpose of this design is to ensure both airtightness and aesthetics). Superheated steam temperature in thermal power plants is primarily regulated using the water / coal ratio, with two-stage water spray desuperheating as a secondary method. The two-stage superheater desuperheaters are installed on the inlet pipes of the screen-type superheater and the high-temperature superheater, respectively. Reheated steam temperature is regulated using flue gas dampers, and a primary emergency desuperheating water system is installed on the inlet pipe of the high-temperature reheater. Superheater and reheater desuperheating water is typically adjusted using pneumatic valves. Traditionally, the pneumatic valve positioner is mounted on the pneumatic head of the valve. During normal operation of the thermal power plant unit, because the pneumatic head is directly connected to the valve body, the desuperheating water temperature easily affects the positioner through heat conduction from the valve body. Since the positioner contains circuit boards and other electrical components, and operates under high temperatures and vibrations (around 53°C), the pneumatic valve positioner frequently malfunctions. Therefore, some existing thermal power plants are gradually switching to split-type valve positioners.

[0003] The stroke detection system and control unit of this positioner can be installed separately. The valve position feedback device (consisting of a high-temperature resistant cylinder and a high-temperature resistant, vibration-resistant position detector mounted on the cylinder), which detects the valve stem position, is installed at the pneumatic valve. The more vulnerable control unit can be installed separately at a certain distance from the pneumatic valve actuator. The control unit is connected to the valve position feedback device via a cable and to the pneumatic valve actuator via one or two air pipes. This separate installation method keeps the control unit, which is susceptible to high temperatures and vibrations, away from high-temperature and vibration operating environments, thereby improving the positioner's service life and reliability, and ultimately ensuring the long-term safe and stable operation of the unit.

[0004] In thermal power plants, split-type positioners are mostly retrofitted, and there is often a lack of suitable locations on-site for the direct installation of the split-type positioner control unit. This obviously affects the convenience for workers when modifying pneumatic valves in thermal power plants. Utility Model Content

[0005] This application provides a pneumatic valve holder for desuperheating water in thermal power plants, which can provide an installation base for the control unit in a split positioner, making it easier for staff to install the control unit in an ideal location near the pipeline.

[0006] The above-mentioned objective of this application is achieved through the following technical solution: A pneumatic valve bracket for desuperheating water in a thermal power plant includes a base, on which an installation and dismantling assembly is provided. The base can be detachably connected to a steel grating on site via the installation and dismantling assembly. A hollow sleeve is welded to the top of the base, and an inner adjusting tube is inserted inside the hollow sleeve. The inner adjusting tube and the hollow sleeve are slidably connected in the vertical direction. The hollow sleeve is provided with a mounting bracket, and the mounting bracket is provided with mounting holes for connecting to the control unit in the pneumatic valve.

[0007] Furthermore, the mounting bracket includes two connecting side rods, both of which are fixedly connected to the inner adjusting tube and are symmetrical about the inner adjusting tube. A metal fixing strip is provided on one side of the inner adjusting tube, and the side of the metal fixing strip near the inner adjusting tube is fixedly connected to both connecting side rods. The mounting hole is provided on the metal fixing strip.

[0008] Furthermore, the mounting holes are provided on the metal fixing strip along its length.

[0009] Furthermore, a clearance groove is provided on one of the opposite sides of the hollow sleeve, and both clearance grooves are connected to the internal space of the hollow sleeve; the two connecting side rods on the inner adjusting tube are respectively inserted into the two clearance grooves, and the connecting side rods and the clearance grooves on the corresponding sides are slidably connected in the vertical direction.

[0010] Furthermore, a plurality of internal thread adjustment holes are uniformly provided on one side wall of the hollow sleeve along the vertical direction, and at least one of the internal thread adjustment holes is internally threaded with an adjustment bolt.

[0011] Furthermore, the installation and removal assembly includes U-bolts and fastening holes provided on the base. Two fastening holes are respectively provided on the adjacent sides of one opposite side of the base. There are two U-bolts. After the two ends of the open side of each U-bolt pass through the holes in the steel grating on site and are inserted into the two fastening holes on the corresponding side of the base, the base can be fixed to the steel grating by cooperating with nuts of the corresponding specifications.

[0012] Furthermore, one side of the fastening hole is an open structure.

[0013] In summary, this application includes at least one of the following beneficial technical effects: The base of this application can be installed at any position on the steel grating near the pipeline where the pneumatic valve is installed on site via the installation and removal assembly. Since the installation and removal assembly detachably connects the base and the steel grating, it facilitates subsequent adjustments to the position of the control unit. The base of this application features a hollow sleeve with an inner adjusting tube slidably connected inside. By adjusting the relative position between the hollow sleeve and the inner adjusting tube, the mounting bracket for installing the pneumatic valve positioner control unit is positioned ideally in the vertical direction. After the base and inner adjusting tube are adjusted, the operator aligns the pre-drilled holes on the control unit housing with the mounting holes on the mounting bracket, and then secures the control unit with bolts and nuts. This frame not only offers flexible operation but also provides an ideal installation position for the control unit in the pneumatic valve positioner quickly and easily on site, making it particularly suitable for use when converting thermal power plants to split-type positioners. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the pneumatic valve holder of this application in use on the production site; Figure 2 This is a schematic diagram of the overall structure as viewed from the mounting frame side of this application; Figure 3 This is a schematic diagram of the overall structure as viewed from the adjusting bolt side of this application.

[0016] Reference numerals: 1. Base; 2. Mounting / Removing assembly; 21. U-bolt; 22. Fastening hole; 3. Steel grating; 4. Hollow sleeve; 5. Inner adjusting tube; 6. Mounting bracket; 61. Connecting side rod; 62. Metal fixing strip; 7. Mounting hole; 8. Clearance groove; 9. Internal threaded adjusting hole; 10. Adjusting bolt; 11. Long metal washer; 12. Control unit. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application are described clearly and completely below. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are also within the scope of protection of this application.

[0018] like Figures 1-3 As shown, this application discloses a pneumatic valve bracket for desuperheating water in a thermal power plant, comprising a base 1, a mounting and disassembly assembly 2 on the base 1, and the base 1 being detachably connected to a steel grating 3 on site via the mounting and disassembly assembly 2; a hollow sleeve 4 is welded to the top of the base 1, and an inner adjusting pipe 5 is inserted into the hollow sleeve 4, with the inner adjusting pipe 5 and the hollow sleeve 4 being slidably connected in the vertical direction; a mounting bracket 6 is provided on the hollow sleeve 4, and the mounting bracket 6 is provided with mounting holes 7 for connecting to the control unit 12 in the pneumatic valve.

[0019] In the above embodiments, within the production site of a thermal power plant, various pipelines and equipment are mostly installed on steel grating 3 (also known in the industry as grating). This type of platform, made of high-strength steel, is structurally stable and has excellent load-bearing capacity. Furthermore, its open grid structure allows for good air permeability around the equipment and pipelines. To ensure the stable operation of the thermal power plant, workers frequently need to inspect the pipelines and surrounding areas. The grid structure of steel grating 3, with its excellent anti-slip properties, prevents workers from slipping in wet and slippery environments.

[0020] The base 1 of this application can be installed on the grid holes of the steel grating 3 at the production site of a thermal power plant via the installation and removal component 2. The steel grating 3 essentially covers the entire area around the pipeline to be modified. Therefore, when installing the control unit 12 in the split-type positioner, workers can generally place it in an ideal position near the pipeline using the installation and removal component 2. Furthermore, the installation and removal component 2 of this application connects the base 1 and the steel grating 3 in a detachable manner. Compared to welding, this makes it more convenient for workers to adjust the position of the control unit 12 later.

[0021] The base 1 of this application is equipped with a hollow sleeve 4, and an inner adjusting tube 5 is slidably connected inside the hollow sleeve 4. By adjusting the relative position between the hollow sleeve 4 and the inner adjusting tube 5, the mounting bracket 6 for installing the pneumatic valve positioner control unit 12 is positioned ideally in the vertical direction. After the positions of the base 1 and the inner adjusting tube 5 are adjusted, the operator aligns the pre-drilled holes on the housing of the control unit 12 with the mounting holes 7 on the mounting bracket 6, and then uses bolts and nuts to complete the fixing of the control unit 12. This bracket is not only simple and flexible to operate, with horizontal and vertical adjustment functions, but it can also quickly provide an ideal installation position for the control unit 12 in the pneumatic valve positioner on-site. It is especially suitable for use when converting a thermal power plant to a split-type positioner, saving operators the trouble of finding a suitable installation position for the control unit 12 on-site.

[0022] Furthermore, such as Figure 2 and Figure 3 As shown, the mounting bracket 6 includes two connecting side rods 61, both of which are fixedly connected to the inner adjusting tube 5 and are symmetrical about the inner adjusting tube 5. A metal fixing strip 62 is provided on one side of the inner adjusting tube 5, and the side of the metal fixing strip 62 near the inner adjusting tube 5 is fixedly connected to both connecting side rods 61. The mounting hole 7 is provided on the metal fixing strip 62.

[0023] In the above embodiments, the metal fixing strip 62 of this application is a rectangular metal plate, the length of which is greater than the length of the control unit 12 in most split-type positioners. This allows the metal fixing strip 62 to adapt to multiple sizes of control units 12, thereby improving the convenience for workers using the frame of this application. The metal fixing strip 62 is connected to the inner adjusting tube 5 through two connecting side rods 61. Workers can adjust the vertical position of the metal fixing strip 62 by changing the relative position of the inner adjusting tube 5 and the hollow sleeve 4. The mounting hole 7 on the metal fixing strip 62 is for workers to insert bolts between the control unit 12 housing and the metal fixing strip 62 when installing the control unit 12 housing onto the metal fixing strip 62. After the bolt passes through the reserved hole on the control unit 12 housing and the mounting hole 7 on the metal fixing strip 62, a nut is screwed onto the bolt to securely fix the control unit 12 onto the metal fixing strip 62.

[0024] Furthermore, such as Figure 2 As shown, mounting holes 7 are provided on the metal fixing strip 62 along its length.

[0025] In the above embodiments, the length of the mounting hole 7 is at least 80% of the length of the metal fixing strip 62, so that even if there are differences in the spacing between the reserved holes for installation on the split-type positioner control unit 12 of different specifications, the mounting hole 7 on the metal fixing strip 62 of this application can be well adapted.

[0026] Furthermore, such as Figure 2 and Figure 3 As shown, a clearance groove 8 is provided on one of the opposite sides of the hollow sleeve 4, and the two clearance grooves 8 are connected to the internal space of the hollow sleeve 4; the two connecting side rods 61 on the inner adjusting tube 5 are respectively inserted into the two clearance grooves 8, and the connecting side rods 61 and the corresponding clearance grooves 8 are slidably connected in the vertical direction.

[0027] In the above embodiments, the two clearance slots 8 on the hollow sleeve 4 allow the connecting side rods 61 on both sides of the inner adjusting tube 5 to pass through. After the base 1 is fixed, when the worker moves the inner adjusting tube 5 along the axis of the hollow sleeve 4, the clearance slots 8 can guide the connecting side rods 61, ensuring that the metal fixing strip 62 on the inner adjusting tube 5 always moves smoothly in a specific direction. This eliminates the need for the worker to adjust the angle of the metal fixing strip 62 later. In addition, the clearance slots 8 on the hollow sleeve 4 can increase the adjustment range of the inner adjusting tube 5, and the vertical installation range of the corresponding positioner control unit 12 can also be further improved.

[0028] Furthermore, such as Figure 3 As shown, a plurality of internal thread adjustment holes 9 are uniformly provided on one side wall of the hollow sleeve 4 along the vertical direction, and at least one internal thread adjustment hole 9 is internally threaded with an adjustment bolt 10.

[0029] In the above embodiments, when the worker adjusts the position of the inner adjusting tube 5 within the hollow sleeve 4, the worker can lock the position of the inner adjusting tube 5 within the hollow sleeve 4 by tightening the adjusting bolt 10. If the adjusted tube body of the inner adjusting tube 5 deviates from the internal thread adjusting hole 9 where the adjusting bolt 10 is installed, the worker can remove the adjusting bolt 10 and re-insert it into another internal thread adjusting hole 9 facing the tube body of the inner adjusting tube 5. This ensures that the inner adjusting tube 5 can be locked within the hollow sleeve 4 after tightening the adjusting bolt 10. Increasing the number of adjusting bolts 10 can increase the fixing effect of the inner adjusting tube 5.

[0030] Furthermore, such as Figures 1-3 As shown, the installation and removal assembly 2 includes U-bolts 21 and fastening holes 22 provided on the base 1. Two fastening holes 22 are respectively provided on the adjacent sides of one opposite side of the base 1. There are two U-bolts 21. The two ends of the open side of each U-bolt 21 pass through the holes in the steel grating 3 on site and are inserted into the two fastening holes 22 on the corresponding side of the base 1. The base 1 can be fixed to the steel grating 3 by cooperating with the nuts of the corresponding specifications.

[0031] In the above embodiments, before installing the base 1, the worker determines the approximate location of the base 1 to be installed on the steel grating 3 at the production site. Then, the U-bolt 21 is inserted into one of the holes on the steel grating 3. The position of the U-bolt 21 is then adjusted until both ends of the open side of the U-bolt 21 protrude upward from two of the holes on the steel grating 3. The operation of the other U-bolt 21 is the same. Next, the worker can lower the base 1 from the top. During this process, the horizontal position of the U-bolt 21 or the base 1 is adjusted as needed to ensure that the four ends of the two U-bolts 21 can be inserted into the four fastening holes 22 on the base 1 respectively. After the base 1 is placed flat and stable, the worker can screw a bolt onto the ends of the two U-bolts 21 respectively, thereby achieving the effect of detachably fixing the base 1 to the steel grating 3.

[0032] Furthermore, such as Figure 2 and Figure 3 As shown, one side of the fastening hole 22 is an open structure.

[0033] In the above embodiments, the four fastening holes 22 of this application are respectively arranged in pairs on the inner side of one opposite side of the base 1. The side of the hollow sleeve 4 away from the center of the base 1 of these fastening holes 22 is an open structure. Based on this structure, when the worker installs the base 1 on the steel grating 3, after the worker inserts the U-bolt 21 from bottom to top into the hole on the steel grating 3 in the manner of the previous embodiment, a long metal washer 11 can be first put on both ends of the open side of the U-bolt 21, and then a bolt can be roughly tightened on the two external thread ends of the open side of the U-bolt 21. When the worker operates the other U-bolt 21 in the same way, the trouble of holding the previous U-bolt 21 can be saved. After the long metal washer 11 is temporarily installed on both U-bolts 21, even if the worker takes his hands off the two U-bolts 21, they will not fall out of the hole in the steel grating 3. Finally, the worker moves the base 1 between the two U-bolts 21, inserts the two U-bolts 21 into the fastening holes 22 on both sides of the base 1 through the open side, and then tightens the nuts on the U-bolts 21 to complete the fixing of the base 1. Therefore, setting the fastening holes 22 in the above manner can facilitate the worker's installation of the base 1, and the long metal washer 11, in addition to having the function of an ordinary washer, can also evenly distribute the tightening force of the U-bolts 21 during use onto the base 1.

[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A pneumatic valve holder for desuperheating water in a thermal power plant, characterized in that: Includes a base (1), on which a mounting and dismantling assembly (2) is provided, and the base (1) can be detachably connected to the steel grating (3) on site through the mounting and dismantling assembly (2); A hollow sleeve (4) is welded directly above the base (1), and an inner adjusting tube (5) is inserted inside the hollow sleeve (4), and the inner adjusting tube (5) and the hollow sleeve (4) are slidably connected in the vertical direction. The hollow sleeve is provided with a mounting bracket (6), and the mounting bracket (6) is provided with a mounting hole (7) for connecting to the control unit (12) in the pneumatic valve.

2. The pneumatic valve holder for desuperheating water in thermal power plants according to claim 1, characterized in that: The mounting bracket (6) includes two connecting side rods (61), both of which are fixedly connected to the inner adjusting tube (5) and are symmetrical about the inner adjusting tube (5). A metal fixing strip (62) is provided on one side of the inner adjusting tube (5), and the side of the metal fixing strip (62) near the inner adjusting tube (5) is fixedly connected to both of the connecting side rods (61). The mounting hole (7) is provided on the metal fixing strip (62).

3. The pneumatic valve holder for desuperheating water in thermal power plants according to claim 2, characterized in that: The mounting hole (7) is provided on the metal fixing strip (62) along its length.

4. The pneumatic valve holder for desuperheating water in thermal power plants according to claim 2, characterized in that: A clearance groove (8) is provided on one of the opposite sides of the hollow sleeve (4), and the two clearance grooves (8) are connected to the internal space of the hollow sleeve (4); the two connecting rods (61) on the inner adjusting tube (5) are respectively inserted into the two clearance grooves (8), and the connecting rods (61) and the clearance grooves (8) on the corresponding sides are slidably connected in the vertical direction.

5. The pneumatic valve holder for desuperheating water in thermal power plants according to any one of claims 1 to 4, characterized in that: The hollow sleeve (4) has a plurality of internal thread adjustment holes (9) evenly arranged in the vertical direction on one side wall, and at least one of the internal thread adjustment holes (9) is internally threaded with an adjustment bolt (10).

6. The pneumatic valve holder for desuperheating water in thermal power plants according to any one of claims 1 to 4, characterized in that: The mounting and dismantling assembly (2) includes U-bolts (21) and fastening holes (22) provided on the base (1). Two fastening holes (22) are provided on the adjacent sides of one opposite side of the base (1). There are two U-bolts (21). The two ends of the open side of each U-bolt (21) pass through the holes of the steel grating (3) on the site and are inserted into the two fastening holes (22) on the corresponding side of the base (1). The base (1) can be fixed on the steel grating (3) by cooperating with nuts of the corresponding specifications.

7. The pneumatic valve holder for desuperheating water in thermal power plants according to claim 6, characterized in that: One side of the fastening hole (22) is an open structure.

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