A self-tightening sealing structure of disc type constant speed nozzle for deaerator

Abstract

The utility model discloses a disc type constant speed nozzle self -tight type sealing structure for deaerator relates to nozzle overhauling technical field, this disc type constant speed nozzle self -tight type sealing structure for deaerator, including nozzle device, be provided with filter inner tube on the inner wall of nozzle device, the end of nozzle device is installed with end cover, install the sealing cover on the end face of end cover, and the periphery of sealing cover is connected with end cover and filter inner tube through bolt, and bolt sets up ten, install nut at the junction of bolt and end cover, install the support on the outer wall of sealing cover, and support sets up four, and the self -tight type sealing structure of bolt cooperation support is adopted in this scheme, simple structure, convenient operation, low cost, no wearing spare parts, need not spare part, can realize the effect that pollutes and clean simple and convenient, the operation of overhauling is convenient, and the sealing effect is good and can be reused.

Description

Technical Field

[0001] This utility model relates to the field of nozzle maintenance technology, specifically a self-tightening sealing structure for a disc-type constant speed nozzle used in deaerators. Background Technology

[0002] Nozzle devices, especially those used in deaerators of large power plants, are used to fully atomize and deoxygenate condensate before it enters the deaerator equipment. Condensate inevitably contains impurities such as welding slag, metal fragments, and debris; therefore, cleaning of nozzle devices and maintenance and repair of filter devices are frequently required during unit shutdowns for maintenance.

[0003] Routine equipment cleaning, filter inspection, and maintenance require the removal of external connecting pipelines and the removal of the nozzle assembly flange cover before these operations can be carried out. The removal of pipelines and flange covers necessitates the use of overhead cranes or electric hoists (each part weighs approximately 300 kg), and involves the removal of a significant number of studs. For example, in a megawatt-class power plant, a single deaerator in a thermal power unit requires two sets of nozzle assemblies, while a nuclear power unit requires four sets. Each nozzle assembly typically involves the removal and installation of approximately 60 studs.

[0004] In summary, traditional methods have the following shortcomings:

[0005] 1. The operation requires the use of lifting equipment, which needs to be pre-installed, resulting in high construction costs;

[0006] 2. The operation involves working at heights, which presents certain difficulties and safety hazards;

[0007] 3. The disassembly and assembly of too many studs is complicated, time-consuming, and costly.

[0008] 4. The flange part is the pressure-bearing boundary of the pressure vessel. After reinstallation, there may be leakage or other sealing failure problems, which pose a safety hazard.

[0009] 5. Since the sealing gaskets are disposable parts and cannot be reused, they must be replaced with new ones each time they are installed. Each nozzle device requires two sealing gaskets, resulting in a large number of spare gaskets, high procurement and management costs, and poor economic efficiency. Therefore, we propose a self-tightening sealing structure for disc-type constant speed nozzles in deaerators to solve the problems mentioned above. Utility Model Content

[0010] The purpose of this utility model is to provide a self-tightening sealing structure for a disc-type constant speed nozzle for a deaerator, in order to solve the problem mentioned in the background art that the existing nozzle device requires the removal of the flange cover and bend assembly on the top of the nozzle device, the removal of the internal filter cartridge assembly, and the reassembly after the task is completed when performing sewage discharge or internal maintenance. The disassembly and assembly process involves high-altitude operations, the use of lifting equipment, a large number of thread disassembly and assembly, replacement of sealing gaskets, and necessary sealing tests, which is a rather cumbersome process.

[0011] To achieve the above objectives, this utility model provides the following technical solution: a self-tightening sealing structure for a disc-type constant speed nozzle in a deaerator, comprising a nozzle device, a filter inner cylinder provided on the inner wall of the nozzle device, an end cap installed at the end of the nozzle device, a sealing cap installed on the end face of the end cap, and the sealing cap being connected to the end cap and the filter inner cylinder by bolts, with ten bolts provided, nuts installed at the connection between the bolts and the end cap, four brackets installed on the outer wall of the sealing cap, and anti-loosening washers provided at the connection between the nuts and the end cap.

[0012] Preferably, a sludge collection tank assembly is provided on the inner wall of the sealing cover, and the sludge collection tank assembly is welded to the sealing cover.

[0013] Preferably, the rear end of the nozzle device is equipped with a water inlet device and a deaerator housing.

[0014] Preferably, the upper end of the nozzle device is provided with a condensate trap, one end of the condensate trap is provided with a condensate line, one end of the condensate trap is connected to the inlet device flange through the inlet device flange cover, and the condensate line is connected to the other end flange of the condensate trap through the condensate line flange.

[0015] Preferably, a first sealing gasket is provided between the flange of the water inlet device and the flange cover of the water inlet device, and the connection is secured with a second stud and a second nut. A second sealing gasket is provided between the condensate bend and the condensate pipeline, and the connection is secured with a third stud and a third nut.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] This invention does not use the method of removing the system flange pipeline. Instead, it opens an inspection hole at the bottom end cover of the nozzle device, adds a sealing cover, bracket, fasteners, etc., and is lightweight, with a maximum weight of no more than 20kg. It can be operated by a single person without the aid of other tools, and can be operated from inside the equipment, avoiding the risks of working at height. It uses a self-tightening seal, has a simple structure, is easy to operate, and is low in cost. There are no vulnerable parts and no spare parts are required. It can achieve the effect of easy sewage discharge and cleaning, and convenient maintenance operation. Moreover, the sealing effect is good and it can be reused. It solves the problem that existing nozzle devices require the removal of the flange cover and bend assembly on the top of the nozzle device, the removal of the internal filter cartridge assembly, and reinstallation after the task is completed. The disassembly and assembly process involves high-altitude operations, the use of lifting equipment, a lot of thread disassembly and assembly, replacement of sealing gaskets, and necessary sealing tests, which is quite cumbersome. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0019] Figure 2 This is a schematic diagram of the sealing cap connection structure of this utility model;

[0020] Figure 3 This is a partial structural diagram of the sludge collection tank assembly of this utility model;

[0021] Figure 4 This is a partial structural diagram of the end cap of this utility model;

[0022] Figure 5 This is a partial structural diagram of the filter inner cylinder of this utility model;

[0023] In the diagram: 1. Bracket; 2. Sealing cap; 3. Bolt; 4. Nut; 5. Anti-loosening washer; 6. End cap; 7. Sludge collection tank assembly; 8. Filter inner cylinder; 9. Nozzle device; 10. Water inlet device; 11. Water inlet device flange cover; 12. First sealing gasket; 13. Second stud; 14. Second nut; 15. Deaerator equipment housing; 16. Condensate bend; 17. Condensate pipeline flange; 18. Second sealing gasket; 19. Third stud; 20. Third nut; 21. Condensate pipeline. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0025] Please see Figure 1-5This utility model provides an embodiment of a self-tightening sealing structure for a disc-type constant-speed nozzle used in a deaerator. The structure includes a nozzle device 9, a filter inner cylinder 8 mounted on the inner wall of the nozzle device 9, an end cap 6 mounted at the end of the nozzle device 9, and a sealing cap 2 mounted on the end face of the end cap 6. The sealing cap 2 is connected to the end cap 6 and the filter inner cylinder 8 by ten bolts 3. Nuts 4 are installed at the connection points between the bolts 3 and the end cap 6, and anti-loosening washers 5 are provided at the connection points between the nuts 4 and the end cap 6. A deaerator housing 10 is mounted at the rear end of the nozzle device 9. Each bolt 3 is equipped with an anti-loosening washer 5, which effectively prevents thread loosening during deaerator operation and ensures a seal. A sludge collection tank assembly 7 is provided on the inner wall of the sealing cap 2, and the sludge collection tank assembly 7 is welded to the sealing cap 2. A bracket 1 is installed on the wall, and four brackets 1 are provided. The rear end of the nozzle device 9 is installed on the water inlet device 10. The water inlet device 10 is installed on the deaerator equipment housing 15. A condensate bend 16 is provided at the upper end of the nozzle device 9. A condensate line 21 is provided at one end of the condensate bend 16. One end of the condensate bend 16 is connected to the flange of the water inlet device 10 through the flange cover 11 of the water inlet device. The condensate line 21 is connected to the flange of the other end of the condensate bend 16 through the condensate line flange 17. A first sealing gasket 12 is provided between the flange of the water inlet device 10 and the flange cover 11 of the water inlet device, and is fastened to the second nut 14 with a second stud 13. A second sealing gasket 18 is provided between the condensate bend 16 and the condensate line 21, and is fastened to the third nut 20 with a third stud 19.

[0026] The device includes components such as a sealing cover 2, a sludge collection tank assembly 7, a filter inner cylinder 8, bolts 3, nuts 4, and brackets 1. The device first uses the built-in sludge collection tank assembly 7 to capture and store impurities that cannot pass through the filter screen of the filter inner cylinder 8. When the machine is stopped and sewage discharge or maintenance is required, the bottom sealing cover 2 is removed by disassembling the bolts 3. Sludge discharge, cleaning, and maintenance can be performed through the inspection hole exposed at the disassembly point of the sealing cover 2. The sealing surface of the device needs to be precisely machined. Because it is a self-tightening sealing structure, it does not require a large bolt preload. A seal can be achieved with very few bolts 3. The device is disassembled and assembled only inside the equipment. The total weight does not exceed 20kg. The sealing cover 2 and the sludge collection tank assembly 7 are equipped with four brackets 1 and two connecting rods for operation. Therefore, apart from using a torque wrench, the disassembly and assembly can be completed by hand without any other facilities.

[0027] Local structural optimization of the filter inner cylinder 8, such as... Figure 5 As shown, the boundary seal adopts a non-planar type, optimized into a similar Ω shape, which generates elastic deformation when compressed, thereby achieving a seal and preventing impurities from passing through this sealing boundary, while not affecting the application of the pre-tightening force required for the sealing end cap 6.

[0028] The material can be carbon steel, low alloy steel, or high alloy steel, preferably a material commonly used in the field such as high alloy steel austenitic stainless steel, and more preferably austenitic ultra-low carbon stainless steel.

[0029] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A self-tightening sealing structure for a disc-type constant-speed nozzle in a deaerator, comprising a nozzle device (9), characterized in that: The nozzle device (9) has a filter inner cylinder (8) on its inner wall. The nozzle device (9) has an end cap (6) installed at its end. The end cap (6) has a sealing cap (2) installed on its end face. The sealing cap (2) is connected to the end cap (6) and the filter inner cylinder (8) by bolts (3). There are ten bolts (3). Nuts (4) are installed at the connection between the bolts (3) and the end cap (6). A bracket (1) is installed on the outer wall of the sealing cap (2). There are four brackets (1). Anti-loosening washers (5) are installed at the connection between the nuts (4) and the end cap (6).

2. The self-tightening sealing structure of a disc-type constant-speed nozzle for a deaerator according to claim 1, characterized in that: The inner wall of the sealing cover (2) is provided with a sludge collection tank assembly (7), and the sludge collection tank assembly (7) is welded to the sealing cover (2).

3. The self-tightening sealing structure of a disc-type constant-speed nozzle for a deaerator according to claim 1, characterized in that: The nozzle device (9) is equipped with a water inlet device (10) and a deaerator housing (15) at its rear end.

4. The self-tightening sealing structure of a disc-type constant-speed nozzle for a deaerator according to claim 3, characterized in that: The upper end of the nozzle device (9) is provided with a condensate trap (16), and one end of the condensate trap (16) is provided with a condensate line (21). One end of the condensate trap (16) is connected to the flange of the water inlet device (10) through the flange cover (11) of the water inlet device, and the condensate line (21) is connected to the flange of the other end of the condensate trap (16) through the condensate line flange (17).

5. The self-tightening sealing structure of a disc-type constant-speed nozzle for a deaerator according to claim 4, characterized in that: A first sealing gasket (12) is provided between the flange of the water inlet device (10) and the flange cover (11) of the water inlet device, and is fastened to the second nut (14) with a second stud (13). A second sealing gasket (18) is provided between the condensate bend (16) and the condensate pipeline (21), and is fastened to the third nut (20) with a third stud (19).

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