Valve clack assembly of boiler soot blower

Abstract

The utility model relates to a valve clack assembly of a boiler soot blower, which belongs to the technical field of valve clacks of boiler soot blowers and comprises a lower valve clack and an upper valve clack. A valve rod which penetrates through the upper valve clack and is tightly attached to the upper valve clack is arranged in the center of the lower valve clack, and the valve rod is in threaded connection with a flat opening threaded head which enables the upper valve clack and the valve rod to be assembled, spliced and fixed. A corrugated hose which can stretch and contract and is located outside the valve rod is installed between the lower valve clack and the upper valve clack. A buffering assembly is arranged between the lower valve clack and the upper valve clack. According to the valve clack assembly of the boiler soot blower, the buffer assembly is matched with the resistance increasing structure, so that the upper valve clack firstly makes contact with the valve body and seals the opening in the process that the valve rod moves upwards to drive the upper valve clack and the lower valve clack to move upwards synchronously; and then the valve rod continues to move upwards to drive the lower valve clack to move under the buffering resistance increasing effect to make slow contact with the valve body, the leakproofness is improved, and meanwhile contact abrasion is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of soot blower valve flaps of boilers, in particular to a soot blower valve flap assembly of a boiler. Background Technique

[0002] The lifting valve of the boiler soot blower is an important component for controlling the working state of the soot blower in the boiler system. The structure and working principle of its valve flap are crucial for the soot cleaning efficiency and safety of the boiler. The following is a detailed introduction to the structure and principle of the valve flap of the boiler soot blower lifting valve:

[0003] Structure of the Valve Flap

[0004] The valve flap of the boiler soot blower lifting valve is usually composed of the following parts:

[0005] Valve flap body: The valve flap body generally uses high-temperature resistant and corrosion-resistant materials, such as stainless steel or alloy materials, to adapt to the high-temperature and corrosive environment of the boiler.

[0006] Sealing surface: The sealing surface of the valve flap contacts the valve seat to ensure that the valve can effectively prevent the leakage of gas or dust when closed. The sealing surface is usually precision machined to improve the sealing performance.

[0007] Guiding part: The guiding part of the valve flap is used to ensure that the valve flap can move smoothly during the opening and closing processes, reducing wear and jamming phenomena.

[0008] Spring or weight: In some designs, the valve flap may be equipped with a spring or a weight to provide additional closing force to ensure that the valve can automatically close when there is no operation.

[0009] Among them, when the valve flap is closed, the valve flap moves and contacts the valve body to seal the opening. Therefore, during the instant movement and contact of the valve flap with the valve body, due to the high speed, the contact friction is extremely likely to cause wear of the valve flap, resulting in a gap between the valve flap and the valve body, failing to achieve good sealing performance and causing air leakage. Therefore, this application designs a soot blower valve flap assembly for a boiler that improves the closing tightness and reduces wear to solve this defect of the existing technology. Content of the Utility Model

[0010] Aiming at the deficiencies of the existing technology, the utility model provides a soot blower valve flap assembly of a boiler, which has the advantages of improving the closing tightness and reducing wear.

[0011] To achieve the above object, the utility model provides the following technical solution: A soot blower valve flap assembly of a boiler, including a lower valve flap and an upper valve flap;

[0012] A valve rod is provided at the center of the lower valve flap, passing through the upper valve flap and closely fitting with the upper valve flap. A flat-mouth threaded head for assembling, splicing and fixing the upper valve flap and the valve rod is threadedly connected to the valve rod;

[0013] A corrugated hose that can be stretched and contracted and is located outside the valve stem is installed between the lower valve flap and the upper valve flap;

[0014] A buffer assembly is provided between the lower valve flap and the upper valve flap;

[0015] A resistance increasing structure is provided on the buffer assembly;

[0016] When the valve stem moves upward to drive the lower valve flap and the upper valve flap to move upward synchronously, the upper valve flap first contacts and seals the air hole of the valve body, and then buffers and increases the resistance in cooperation with the buffer assembly and the resistance increasing structure, so that the lower valve flap slowly moves upward to contact and seal again at the air hole of the valve body, reducing wear.

[0017] By adopting the above technical solution, after the upper valve flap first contacts the valve body to seal the air hole, through the buffering and resistance increasing effects of the buffer assembly and the resistance increasing structure, the lower valve flap gradually moves to contact the valve body to reduce friction and improve the contact tightness.

[0018] As a preferred technical solution of the present invention, the buffer assembly includes a plurality of mounting cylinders embedded in the lower surface of the lower valve flap. A first spring is installed in the mounting cylinder, and the other end of the first spring is installed with a moving rod connected to the upper valve flap.

[0019] By adopting the above technical solution, the upward buffering of the lower valve flap and the upper valve flap is realized.

[0020] As a preferred technical solution of the present invention, when the first spring is in the maximum stretched state, the moving rod and the mounting cylinder are not separated from each other, and the maximum compression distance of the corrugated hose is the same as the maximum compression distance of the first spring.

[0021] By adopting the above technical solution, it is ensured that the corrugated hose and the first spring can be telescopic, and at the same time, it is avoided that the moving rod cannot be reset after being separated from the mounting cylinder.

[0022] As a preferred technical solution of the present invention, the resistance increasing structure includes a plurality of limiting grooves opened on the inner wall of the mounting cylinder and a plurality of mounting grooves opened on the outer side of the moving rod;

[0023] Wherein, a resistance increasing strip is installed in the limiting groove, a second spring is installed in the mounting groove, and the other end of the second spring is installed with a resistance increasing block that closely fits with the resistance increasing strip.

[0024] By adopting the above technical solution, the effect of increasing the resistance is achieved during the upward buffering process of the lower valve flap and the upper valve flap.

[0025] As a preferred technical solution of the present utility model, when the second spring is in a natural and fully extended state, the resistance increasing block and the installation groove are not separated from each other; when the second spring is in a compressed and extended state, the resistance increasing block and the limiting groove are not separated from each other.

[0026] By adopting the above technical solution, it is avoided that the resistance increasing block cannot be reset after being separated from the installation groove.

[0027] As a preferred technical solution of the present utility model, sealing sleeves are sleeved on the outer peripheral walls of the lower valve flap and the upper valve flap, and a perforation for inserting the flat-mouth threaded head is provided on the lower valve flap.

[0028] By adopting the above technical solution, it is convenient for the flat-mouth threaded head to be inserted to lock and fix the valve stem, and the sealing effect when the lower valve flap and the upper valve flap contact the valve body is improved.

[0029] As a preferred technical solution of the present utility model, the lower valve flap, the upper valve flap and the valve stem are concentric, and a sealing ring is provided at the joint of the upper valve flap and the valve stem.

[0030] By adopting the above technical solution, the contact sealing performance when the upper valve flap moves along the valve stem is ensured.

[0031] Compared with the prior art, the technical solution of the present application has the following beneficial effects:

[0032] For the valve flap assembly of the boiler soot blower, through the cooperation of the buffer assembly and the resistance increasing structure provided, it is ensured that during the process of the valve stem moving upward to drive the upper valve flap and the lower valve flap to move upward synchronously, the upper valve flap first contacts the valve body and seals the opening, and then when the valve stem continues to move upward to drive the lower valve flap to move and slowly contact the valve body under the action of buffering and resistance increasing, while improving the tightness, the contact wear is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 is a perspective view of the present utility model;

[0034] Figure 2 is a flipped perspective view of the present utility model;

[0035] Figure 3 is a sectional perspective view of the present utility model;

[0036] Figure 4 is an enlarged view of part A of the present utility model;

[0037] Figure 5 is a sectional perspective view of the present utility model;

[0038] Figure 6 is an assembled perspective view of the present utility model and the valve body.

[0039] In the figure: 1. Lower valve flap; 2. Flat-mouth threaded head; 3. Valve stem; 4. Corrugated hose; 5. Upper valve flap; 6. Installation cylinder; 7. First spring; 8. Moving rod; 9. Limit groove; 10. Resistance-increasing strip; 11. Installation groove; 12. Second spring; 13. Resistance-increasing block. Specific implementation manner

[0040] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0041] Please refer to Figures 1 to 2 , the valve flap assembly of the boiler soot blower in this embodiment includes a lower valve flap 1 and an upper valve flap 5.

[0042] A valve stem 3 passing through the upper valve flap 5 and tightly fitting with the upper valve flap 5 is provided at the center of the lower valve flap 1, and a flat-mouth threaded head 2 for assembling and splicing and fixing the upper valve flap 5 and the valve stem 3 is threadedly connected to the valve stem 3.

[0043] The surface of the flat-mouth threaded head 2 is provided with a flat mouth, which is convenient for inserting a flat-head screwdriver into the flat mouth to drive the flat-mouth threaded head 2 to rotate, thereby realizing the disassembly and assembly of the valve stem 3.

[0044] The diameter of the lower valve flap 1 is larger than that of the upper valve flap 5.

[0045] Sealing sleeves are sleeved on the outer peripheral walls of the lower valve flap 1 and the upper valve flap 5 to ensure the sealing performance of the lower valve flap 1 and the upper valve flap 5 in contact with the valve body. A perforation for inserting the flat-mouth threaded head 2 is provided on the lower valve flap 1.

[0046] The lower valve flap 1, the upper valve flap 5 and the valve stem 3 are concentric. A sealing ring is provided at the joint of the upper valve flap 5 and the valve stem 3 to ensure the sealing performance of the contact between the upper valve flap 5 and the valve stem 3.

[0047] A corrugated hose 4 that can be extended and contracted and is located outside the valve stem 3 is installed between the lower valve flap 1 and the upper valve flap 5.

[0048] Please refer to Figures 3 to 5 , in this embodiment, a buffer assembly is provided between the lower valve flap 1 and the upper valve flap 5.

[0049] It should be noted that the buffer assembly includes a plurality of mounting cylinders 6 which are symmetrically distributed and embedded and fixed on the lower surface of the lower valve flap 1. A first spring 7 is installed and fixed inside the mounting cylinder 6, and the other end of the first spring 7 is installed and fixed with a moving rod 8 which is connected and fixed to the upper valve flap 5.

[0050] When the first spring 7 is in the maximum extended state, the moving rod 8 and the mounting cylinder 6 are not separated from each other, and the maximum compression distance of the corrugated hose 4 is the same as the maximum compression distance of the first spring 7.

[0051] A resistance increasing structure is provided on the buffer assembly in this embodiment.

[0052] When the valve stem 3 moves upward to drive the lower valve flap 1 and the upper valve flap 5 to move upward synchronously, the upper valve flap 5 first contacts and seals the air hole of the valve body, and then buffers and increases resistance in cooperation with the buffer assembly and the resistance increasing structure, so that the lower valve flap 1 slowly moves upward to contact and seal again at the air hole of the valve body, reducing wear.

[0053] It should be noted that the resistance increasing structure includes a plurality of limiting grooves 9 which are symmetrically distributed and opened on the inner wall of the mounting cylinder 6 and a plurality of mounting grooves 11 which are opened on the outer side of the moving rod 8 and correspond to the limiting grooves 9 one by one.

[0054] Among them, a resistance increasing strip 10 is installed and fixed in the limiting groove 9, a second spring 12 is installed in the mounting groove 11, and the other end of the second spring 12 is installed and fixed with a resistance increasing block 13 which is in close fit with the resistance increasing strip 10.

[0055] Both the resistance increasing strip 10 and the resistance increasing block 13 are made of the material of vehicle brake pads.

[0056] When the second spring 12 is in the natural and fully extended state, the resistance increasing block 13 and the mounting groove 11 are not separated from each other. When the second spring 12 is in the compressed and extended state, the resistance increasing block 13 and the limiting groove 9 are not separated from each other.

[0057] Please refer to Figure 6 , an air hole is opened on the valve body, an upper sealing groove which is communicated with the air hole and has the same diameter as the upper valve flap 5 is opened on the valve body, and a lower sealing groove which is communicated with the upper sealing groove and has the same diameter as the lower valve flap 1 is opened on the valve body.

[0058] The working principle of the above embodiment is as follows:

[0059] When closing the valve, the valve stem 3 moves upward to drive the upper valve flap 5 and the lower valve flap 1 to move upward synchronously. At this time, the upper valve flap 5 located above will first contact the valve body to seal the air hole of the valve body. During the momentary contact of the upper valve flap 5, the upper valve flap 5 is impacted by the contact, pushing the moving rod 8 downward, while buffering the impact force by compressing the first spring 7;

[0060] As the movable rod 8 moves downward and in conjunction with the elastic telescopic action of the second spring 12, the resistance increasing block 13 is pushed to always closely fit with the resistance increasing strip 10 in the limiting groove 9. Thus, during the movement of the resistance increasing block 13 along with the movable rod 8, frictional resistance is increased with the resistance increasing strip 10 for downward buffering, thereby avoiding hard impact contact between the upper valve flap 5 and the valve body and increasing wear;

[0061] In addition, after the upper valve flap 5 contacts the valve body to seal the air hole, the valve stem 3 continues to move upward to drive the lower valve flap 1 to move upward synchronously. At this time, in combination with the above-mentioned resistance increasing and buffering principle, the movement of the lower valve flap 1 is continuously buffered and the resistance is increased, ensuring that the lower valve flap 1 slowly moves upward until it contacts and fits with the valve body to complete the sealing of the air hole again. While achieving double-layer sealing of the upper valve flap 5 and the lower valve flap 1, the impact force of the lower valve flap 1 contacting and closing with the valve body below is reduced, the wear degree during use is decreased, and the service life is improved (it should be noted that after the upper valve flap 5 contacts the valve body to seal the air hole, as the lower valve flap 1 moves upward, the corrugated hose 4 is compressed synchronously, and the airtightness of the combination between the lower valve flap 1 and the upper valve flap 5 is ensured to avoid air leakage).

Claims

1. Boiler soot blower valve flap assembly, including a lower valve flap (1) and an upper valve flap (5); At the center of the lower valve flap (1), there is a valve stem (3) that passes through the upper valve flap (5) and fits tightly with the upper valve flap (5). A flat-mouth threaded head (2) that assembles, splices, and fixes the upper valve flap (5) to the valve stem (3) is threadedly connected to the valve stem (3); It is characterized in that: A corrugated hose (4) that can stretch and contract and is located outside the valve stem (3) is installed between the lower valve flap (1) and the upper valve flap (5); A buffer assembly is provided between the lower valve flap (1) and the upper valve flap (5); A resistance-increasing structure is provided on the buffer assembly; When the valve stem (3) moves upward to drive the lower valve flap (1) and the upper valve flap (5) to move upward synchronously, the upper valve flap (5) first contacts and seals with the body air hole, and then buffers and increases resistance in cooperation with the buffer assembly and the resistance-increasing structure, so that the lower valve flap (1) slowly moves upward to contact and seal again at the body air hole, reducing wear.

2. The disc assembly of the boiler soot blower valve according to claim 1, characterized in that: The buffer assembly includes a plurality of mounting cylinders (6) embedded in the lower surface of the lower valve flap (1). A first spring (7) is installed in the mounting cylinder (6), and the other end of the first spring (7) is installed with a moving rod (8) connected to the upper valve flap (5).

3. The disc assembly of the boiler soot blower valve according to claim 2, wherein: When the first spring (7) is in the maximum extended state, the moving rod (8) and the mounting cylinder (6) are not separated from each other, and the maximum compression distance of the corrugated hose (4) is the same as the maximum compression distance of the first spring (7).

4. The valve flap assembly of the boiler soot blower according to claim 2, characterized in that: The resistance-increasing structure includes a plurality of limiting grooves (9) opened on the inner wall of the mounting cylinder (6) and a plurality of mounting grooves (11) opened on the outer side of the moving rod (8); Among them, a resistance-increasing strip (10) is installed in the limiting groove (9), a second spring (12) is installed in the mounting groove (11), and the other end of the second spring (12) is installed with a resistance-increasing block (13) that fits tightly with the resistance-increasing strip (10).

5. The valve flap assembly of the boiler soot blower according to claim 4, wherein: When the second spring (12) is in the natural and fully extended state, the resistance-increasing block (13) and the mounting groove (11) are not separated from each other. When the second spring (12) is in the compressed and extended state, the resistance-increasing block (13) and the limiting groove (9) are not separated from each other.

6. The valve disc assembly of the boiler soot blower according to claim 1, characterized in that: Sealing sleeves are sleeved on the outer peripheral walls of the lower valve flap (1) and the upper valve flap (5), and a perforation for inserting the flat-mouth threaded head (2) is opened on the lower valve flap (1).

7. The disc assembly of the boiler soot blower valve according to claim 1, characterized in that: The lower valve flap (1), the upper valve flap (5), and the valve stem (3) are concentric, and a sealing ring is provided at the fitting place of the upper valve flap (5) and the valve stem (3).

Images