Regulating valve of boiler SCR (Selective Catalytic Reduction) denitration system

Abstract

The utility model provides a boiler SCR (Selective Catalytic Reduction) denitration system regulating valve, which relates to the field of regulating valves, and comprises a valve body, a valve core for rotatably controlling the flow to pass through is arranged in the valve body, one end of the valve core positioned on the outer side of the valve body is fixedly connected with a control unit, the control unit comprises a valve rod, the valve rod is fixedly connected with the valve core, and the valve rod is fixedly connected with the valve core. The control unit further comprises a power unit for driving the valve rod to rotate, a limiting cavity is fixedly installed above the valve body, the valve rod is rotationally connected into the limiting cavity, and a friction plate is fixedly installed on the outer surface, located in the limiting cavity, of the valve rod. According to the boiler SCR denitration system regulating valve, firstly, the limiting part is driven to be separated from the friction plate, then the valve rod is driven by the driving part to control the valve element to rotate, after regulation is completed, the limiting part is reset, the friction plate is rubbed so that the valve rod cannot be rotated, and by means of the arrangement, the regulating valve can be prevented from being mistakenly regulated during electric regulation; therefore, the regulating valve can be kept in a stable state for a long time.

Description

Technical Field

[0001] This utility model relates to the field of regulating valve technology, specifically a regulating valve for a boiler SCR denitrification system. Background Technology

[0002] CN222334643U describes a regulating valve for a furnace undergoing fire exchange and denitrification ammonia injection, belonging to the field of regulating valve technology. It addresses the problem of existing regulating valves for furnace fire exchange and denitrification ammonia injection, where the regulating rotor is exposed to the outside environment for extended periods, posing a significant risk of accidental activation and a major safety hazard. The valve includes: a valve body; a fixing component fixedly connected to the top of the valve body; a fixing box fixedly connected to the upper right end of the valve body; two protective covers distributed at the front and rear ends of the fixing component; an opening and closing assembly mounted on the fixing component; and a limiting assembly housed inside the limiting box. In daily use, the two protective covers enclose the regulating rotor, preventing accidental activation and potential safety accidents. The protective covers also allow for convenient and quick adjustment of their on / off states, making the valve highly practical. However, in actual use, regulating valves are typically controlled by a remote signal control unit. Due to the complex operating conditions of regulating valves, interference signals are easily generated, leading to accidental activation of the valve. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this utility model provides a regulating valve for a boiler SCR denitrification system, which solves the problem of accidental activation of existing regulating valves.

[0004] Technical solution

[0005] To achieve the above objectives, this utility model provides the following technical solution: a regulating valve for a boiler SCR denitrification system, comprising a valve body, an internal valve core for controlling flow through rotation, a control unit fixedly connected to one end of the valve core on the outside of the valve body, the control unit comprising a valve stem fixedly connected to the valve core, the control unit further comprising a power unit for driving the valve stem to rotate, a limiting cavity fixedly installed above the valve body, the valve stem rotatably connected to the inside of the limiting cavity, a friction plate fixedly installed on the outer surface of the valve stem inside the limiting cavity, a limiting part for restricting the rotation of the valve stem by pressing against the friction plate inside the limiting cavity, a support cavity rotatably connected to the valve stem on the outer surface of the valve stem, a driving part for driving the valve stem to rotate inside the support cavity, the support cavity fixedly connected to the valve body, a gear fixedly sleeved on the outer surface of the valve stem inside the support cavity, a rack meshing on one side of the gear, and the driving part connected to the rack.

[0006] Furthermore, the limiting part includes a friction ring sleeved on the outer surface of the valve stem, a return spring is provided between the friction ring and the bottom wall of the limiting cavity, a magnetic block is fixedly installed at the bottom end of the friction ring, and an electromagnet that attracts the magnetic block to move downward is fixedly installed on the bottom wall of the limiting cavity. The driving part includes an electromagnetic telescopic sleeve, the free end of the electromagnetic telescopic sleeve is fixedly connected to the rack plate, and the fixed end of the electromagnetic telescopic sleeve is fixedly connected to the support cavity.

[0007] Furthermore, the limiting part includes a sealing ring sleeved on the outer surface of the valve stem. A compression spring is provided between the bottom end of the sealing ring and the bottom wall of the limiting cavity. Friction blocks are arranged at intervals above the sealing ring. One end of the limiting cavity is connected to and passes through an air inlet pipe, which is aligned with the gap between adjacent friction blocks. The other end of the limiting cavity is connected to and has a through hole. The driving part includes a lead shaft sleeved inside the rack plate. One end of the lead shaft is provided with a sealing cavity. An impeller is fixedly installed on the outer surface of the lead shaft inside the sealing cavity. An exhaust hole is provided at the top of the sealing cavity. Air inlets are provided on both sides of the bottom end of the sealing cavity. The two air inlets are connected and pass through each other via an electromagnetic tee.

[0008] Furthermore, the valve stem has a handwheel on its outer surface above the support cavity that moves upward to engage, and a pin is inserted into the outer surface of the valve stem below the handwheel.

[0009] The beneficial effects of this utility model are as follows:

[0010] 1. The regulating valve of the SCR denitrification system of this boiler first drives the limit part to separate from the friction plate, and then drives the valve stem to control the valve core to rotate through the drive part. After the adjustment is completed, the limit part is reset, and the friction plate is rubbed so that the valve stem cannot be rotated. This setting can prevent the regulating valve from being misadjusted during electric adjustment, thereby keeping the regulating valve in a stable state for a long time.

[0011] 2. The regulating valve of the SCR denitrification system of this boiler has a handwheel on the outer surface of the valve stem above the support cavity, which moves upward to engage. A pin is inserted into the outer surface of the valve stem below the handwheel. The valve stem is divided into upper and lower parts. After the handwheel is inserted into the upper part of the valve stem at the valve stem connection point, the valve stem is welded. The upper part of the valve stem is set as a square protrusion, and the handwheel is set as a square groove. After sliding upward, it engages to make the handwheel drive the valve stem to rotate. This setting allows for manual adjustment when the automatic control part fails, while avoiding accidental handwheel operation. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model;

[0013] Figure 2 This is a schematic diagram of Embodiment 1 of the present utility model;

[0014] Figure 3 This is a schematic diagram of the handwheel connection of this utility model;

[0015] Figure 4 This is a schematic diagram of Embodiment 2 of the present invention.

[0016] The components are as follows: 1. Valve body; 2. Valve core; 3. Control unit; 301. Valve stem; 32. Power unit; 303. Limiting cavity; 304. Friction plate; 35. Limiting part; 306. Support cavity; 37. Drive part; 371. Gear; 372. Rack plate; 351. Friction ring; 352. Return spring; 353. Electromagnet; 373. Electromagnetic telescopic sleeve; 354. Sealing ring; 355. Compression spring; 356. Friction block; 357. Inlet pipe; 358. Through hole; 374. Lead shaft; 375. Sealing cavity; 376. Impeller; 377. Exhaust port; 378. Inlet port; 379. Electromagnetic tee; 4. Handwheel; 5. Pin. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] See Figure 1-4A regulating valve for a boiler SCR denitrification system includes a valve body 1. Inside the valve body 1 is a valve core 2 that controls flow through rotation. A control unit 3 is fixedly connected to one end of the valve core 2 located outside the valve body 1. The control unit 3 includes a valve stem 301, which is fixedly connected to the valve core 2. The control unit 3 also includes a power unit 32 for driving the valve stem 301 to rotate. A limiting cavity 303 is fixedly installed above the valve body 1. The valve stem 301 is rotatably connected inside the limiting cavity 303. A [missing information - likely a device or component] is fixedly installed on the outer surface of the valve stem 301 inside the limiting cavity 303. The friction plate 304 and the limiting cavity 303 are provided with a limiting part 35 that restricts the rotation of the valve stem 301 by pressing against the friction plate 304. The outer surface of the valve stem 301 is provided with a support cavity 306 that is rotatably connected to the valve stem 301. The support cavity 306 is provided with a driving part 37 that drives the valve stem 301 to rotate. The support cavity 306 is fixedly connected to the valve body 1. The support cavity 306 is provided with a gear 371 that is fixedly sleeved on the outer surface of the valve stem 301. A rack plate 372 meshes with one side of the gear 371. The driving part 37 is connected to the rack plate 372. When adjusting the flow rate of the control valve, the limit part 35 is first driven to separate from the friction plate 304. Then, the valve stem 301 is driven by the drive part 37 to control the valve core 2 to rotate. After the adjustment is completed, the limit part 35 is reset, and the friction plate 304 is rubbed so that the valve stem 301 cannot be rotated. This is equivalent to needing an execution signal and a confirmation signal when adjusting the control valve. This setting can prevent the control valve from being misadjusted during electric adjustment, thereby keeping the control valve in a stable state for a long time.

[0019] In Embodiment 1, the limiting part 35 includes a friction ring 351 sleeved on the outer surface of the valve stem 301. A return spring 352 is provided between the friction ring 351 and the inner bottom wall of the limiting cavity 303. A magnetic block is fixedly installed at the bottom end of the friction ring 351. An electromagnet 353 for attracting the magnetic block to move downward is fixedly installed on the inner bottom wall of the limiting cavity 303. The driving part 37 includes an electromagnetic telescopic sleeve 373. The free end of the electromagnetic telescopic sleeve 373 is fixedly connected to the rack plate 372, and the fixed end of the electromagnetic telescopic sleeve 373 is fixedly connected to the support cavity 306. When adjustment is required, the electromagnet 353 is first powered to separate the friction ring 351 from the friction plate 304. Then, the electromagnetic telescopic sleeve 373 is energized. By controlling the magnitude and direction of the energization, the rack plate 372 can be driven to slide, thereby driving the gear 371 to rotate, and finally completing the adjustment of the valve core 2. After the adjustment is completed, the electromagnet 353 is de-energized, and the friction ring 351 contacts the friction plate 304 to restrict the rotation of the valve stem 301.

[0020] In embodiment 2, the limiting part 35 includes a sealing ring 354 sleeved on the outer surface of the valve stem 301. A compression spring 355 is provided between the bottom end of the sealing ring 354 and the inner bottom wall of the limiting cavity 303. Friction blocks 356 are arranged at intervals above the sealing ring 354. One end of the limiting cavity 303 is connected to and passes through an air inlet pipe 357, which is aligned with the gap between adjacent friction blocks 356. The other end of the limiting cavity 303 is connected to a through hole 358. The driving part 37 includes a lead shaft 374 sleeved inside the rack plate 372. One end of the lead shaft 374 is provided with a sealing cavity 375. An impeller 376 is fixedly installed on the outer surface of the lead shaft 374 inside the sealing cavity 375. The top end of the sealing cavity 375 is provided with a... An exhaust port 377 is provided, and air inlets 378 are provided on both sides of the bottom end of the sealing cavity 375. The two air inlets 378 are connected and connected through an electromagnetic tee 379. First, the limiting cavity 303 is kept vented. The air pressure presses down the sealing ring 354 to separate the friction block 356 from the friction plate 304. Then, the air intake direction is controlled by the electromagnetic tee 379. The airflow blows the impeller 376 to rotate, which in turn drives the lead shaft 374 to rotate. This allows the rack plate 372 to slide and drive the valve core 2 to rotate. After the adjustment is completed, the venting of the limiting cavity 303 is stopped. Under the action of the compression spring 355, the friction block 356 returns to its original position and rubs the friction plate 304. This setting can avoid the possibility of explosion caused by electromagnetic drive.

[0021] The valve stem 301 has a handwheel 4 on its outer surface above the support cavity 306 that moves upward to engage. A pin 5 is inserted into the outer surface of the valve stem 301 below the handwheel 4. The valve stem 301 is divided into upper and lower parts. After the handwheel 4 is inserted into the upper part of the valve stem 301 at the connection point, the valve stem 301 is welded. The upper part of the valve stem 301 is set as a square protrusion, and the handwheel 4 is set with a square groove. After sliding upward, the handwheel 4 engages to drive the valve stem 301 to rotate. This setting allows for manual adjustment when the automatic control part fails, while also preventing accidental activation of the handwheel 4.

[0022] It should be noted that in this paper, relational terms such as first and second are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations.

[0023] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A boiler SCR denitration system regulating valve, comprising a valve body (1), the inside of the valve body (1) is provided with a valve core (2) that rotates to control the flow through, and the valve core (2) is fixedly connected with a control unit (3) at one end outside the valve body (1), characterized in that: The control unit (3) includes a valve stem (301), the valve stem (301) is fixedly connected with the valve core (2), the upper portion of the valve body (1) is fixedly installed with a limiting cavity (303), the valve stem (301) is rotatably connected in the limiting cavity (303), the outer surface of the valve stem (301) located in the limiting cavity (303) is fixedly installed with a friction plate (304), the limiting cavity (303) is provided with a limiting portion (35) for limiting the rotation of the valve stem (301) by extruding the friction plate (304), the outer surface of the valve stem (301) is provided with a support cavity (306) rotatably connected with the valve stem (301), the support cavity (306) is provided with a driving portion (37) for driving the rotation of the valve stem (301), the support cavity (306) is fixedly connected with the valve body (1), the support cavity (306) is provided with a gear (371) fixedly sleeved on the outer surface of the valve stem (301), one side of the gear (371) is engaged with a rack plate (372), and the driving portion (37) is connected with the rack plate (372).

2. The boiler SCR denitration system regulating valve according to claim 1, characterized in that: The limiting portion (35) includes a friction ring (351) sleeved on the outer surface of the valve stem (301), the friction ring (351) and the inner bottom wall of the limiting cavity (303) are provided with a return spring (352), the bottom end of the friction ring (351) is fixedly installed with a magnetic block, and the inner bottom wall of the limiting cavity (303) is fixedly installed with an electromagnet (353) for attracting the magnetic block to move downward. The driving portion (37) includes an electromagnetic telescopic sleeve (373), the free end of the electromagnetic telescopic sleeve (373) is fixedly connected with the rack plate (372), and the fixed end of the electromagnetic telescopic sleeve (373) is fixedly connected with the support cavity (306).

3. The boiler SCR denitration system regulating valve according to claim 1, characterized in that: The limiting portion (35) includes a sealing ring (354) sleeved on the outer surface of the valve stem (301), the bottom end of the sealing ring (354) and the inner bottom wall of the limiting cavity (303) are provided with a compression spring (355), the upper portion of the sealing ring (354) is provided with friction blocks (356) distributed at intervals, one end of the limiting cavity (303) is connected and penetrates an air inlet pipe (357), the air inlet pipe (357) is aligned with the gap between adjacent friction blocks (356), and the other end of the limiting cavity (303) is connected and provided with a through hole (358). The driving portion (37) includes a lead screw (374) sleeved in the rack plate (372), one end of the lead screw (374) is provided with a sealing cavity (375), the outer surface of the lead screw (374) located in the sealing cavity (375) is fixedly installed with a vane wheel (376), the top end of the sealing cavity (375) is provided with an exhaust hole (377), the bottom end of the sealing cavity (375) is provided with air inlet holes (378) on both sides, and the two air inlet holes (378) are connected and penetrated through an electromagnetic tee joint (379).

4. The boiler SCR denitration system regulating valve according to any one of claims 1-3, characterized in that: The outer surface of the valve stem (301) located above the support cavity (306) is provided with a hand wheel (4) which moves upward to realize clamping, and the outer surface of the valve stem (301) located below the hand wheel (4) is inserted with a pin shaft (5).

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