Valve hard seal structure and long insertion type soot blower

Abstract

We provide a valve hard seal structure and a long insertion type soot blower. [Solution] The valve hard seal structure includes a seat ring (2) for sealing between a seat ring hole in a sootblower valve body (1) and a valve disc. The seat ring has an annular structure, a chamfered portion at its lower end, and the chamfered portion has a double chamfer structure. The seat ring is extruded into the seat ring hole in the valve body, one end of the seat ring hole in the valve body is connected to the intake port, and the other end is connected to the exhaust port. The valve disc is extruded into the seat ring. Compared to prior art, this has the advantages of better sealing performance and easier maintenance.

Description

[Technical Field]

[0001] The present invention relates to the field of sootblower devices, and more particularly to a valve seal structure, a long-slip type sootblower, and an installation method. [Background technology]

[0002] During continuous boiler operation, the heat-receiving surface often faces the problem of ash and slag accumulation. The accumulation of ash and slag significantly reduces heat transfer efficiency, reducing the overall performance of the boiler and increasing the thermal deviation at the furnace outlet and flue gas temperature. Even more serious, the accumulation of ash and slag can cause high-temperature corrosion, potentially leading to serious safety accidents. Soot blowers play an important role in addressing this issue. By spraying soot-blowing steam, the ash and slag on the heat-receiving surface can be effectively removed, improving heat transfer efficiency and ensuring the safe and efficient operation of the boiler.

[0003] Long-slip soot blowers are mainly used to clean the tube panels and tube bundle heat-receiving surfaces of boilers, and the working temperature of the valve is about 350°C, and the pressure it is subjected to during use is relatively large, so in such a harsh working environment, a hard seal must be used as a sealing method. However, with this sealing method, the sealing surface between the valve body and the seat ring does not seal completely, which can reduce sealing performance and cause soot blowing steam to leak. Summary of the Invention [Problem to be solved by the invention]

[0004] The purpose of this invention is to provide a valve hard seal structure and a long-slot type soot blower to overcome the drawback of the above-mentioned conventional soot blower valves using hard seals, in that the sealing surfaces between the valve body and the seat ring cannot be completely sealed, resulting in poor sealing.

[0005] The objective of the present invention can be achieved by the following technical solutions:

[0006] A valve hard seal structure including a seat ring for sealing a seat ring hole of a valve body of a soot blower and a valve disc, wherein the seat ring has an annular structure, a chamfered portion is provided at a lower end of the seat ring, the chamfered portion has a double chamfer structure, the seat ring is extruded into the seat ring hole of the valve body, one end of the seat ring hole of the valve body is connected to an intake port, and the other end is connected to an exhaust port, and the valve disc is extruded into the seat ring.

[0007] Preferably, the double chamfer structure includes a straight bottom edge, a first straight chamfer edge, a second straight chamfer edge and a straight outer edge connected in order, and the angle between the second straight chamfer edge and the first straight chamfer edge is an obtuse angle.

[0008] Preferably, the angle between the first straight chamfered side and the straight base side is in the range of 15 to 25 degrees.

[0009] Preferably, the angle between the second straight chamfered side and the straight base side is in the range of 40 to 50 degrees.

[0010] Preferably, the distance between the intersection of the second straight chamfered side and the straight outer side and the straight base side is in the range of 1 to 2 cm.

[0011] Preferably, the distance between the intersection of the straight bottom side and the first straight chamfered side and the straight line on which the outer straight side is located is in the range of 1 to 3 cm.

[0012] Preferably, the seat ring is an interference fit in a seat ring bore in the valve body.

[0013] Preferably, the hardness of the seat ring is greater than the hardness of the valve body.

[0014] The solution further provides a long-slide type sootblower including the valve hard seal structure described above.

[0015] Compared with the prior art, the present invention has the following advantages:

[0016] (1) In this solution, the seat ring is fitted with a double chamfer at its lower end. The chamfered edge of the seat ring rests against the inner wall of the seat ring hole, and the seat ring is then pressed into the hole. The double chamfer at the lower end of the seat ring removes burrs from the inner wall of the seat ring hole and presses them into the gap at the bottom corner. At the same time, any residual dirt inside the valve is also trapped in the gap at the bottom corner, ensuring a smooth contact surface between the side wall of the seat ring and the inner wall of the seat ring hole. Even under high pressure during the operation, dirt does not get into the contact surface, ensuring a perfect seal, improving the sealing effect of the device and preventing soot blowing steam leakage. (2) In this solution, the seat ring is extruded into the seat ring hole of the valve body and is in contact with the seat ring hole of the valve body or the valve disc. If soot blowing steam leaks, the seat ring can be directly removed and replaced individually, which reduces the difficulty of fault maintenance and improves the maintenance speed. [Brief explanation of the drawings]

[0017] [Figure 1] FIG. 1 is a schematic diagram of a valve hard seal structure of a long-slip sootblower provided by an embodiment of the present invention. [Figure 2] FIG. 2 is a schematic diagram of a valve seal structure of a long-slip sootblower provided by an embodiment of the present invention. [Figure 3] FIG. 3 is a schematic diagram of a double chamfer design structure of a seat ring provided by an embodiment of the present invention.

[0018] 1, valve body; 2, seat ring; 21, straight bottom edge; 22, first straight chamfered edge; 23, second straight chamfered edge; 24, straight outer edge. DETAILED DESCRIPTION OF THE INVENTION

[0019] In order to make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to 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, but not all of the embodiments. The components of the embodiments of the present invention, as generally described and illustrated in the accompanying drawings, may be arranged and designed in a variety of different configurations.

[0020] Therefore, the following detailed description of the embodiments of the present invention, provided in the accompanying drawings, is not intended to limit the scope of the claimed invention, but rather to represent selected embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0021] It should be noted that in the following figures, like reference numbers and letters represent like items, so that once an item is defined in one figure, it does not require further definition or explanation in subsequent figures.

[0022] In the description of the present invention, the orientations and positional relationships indicated by the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" are based on the orientations and positional relationships shown in the drawings or the orientations and positional relationships in which the product of the present invention is normally placed when used. This is only for the purpose of explaining and simplifying the description of the present invention, and does not indicate or imply that the devices or elements referred to must have a specific orientation or be constructed or operate in a specific orientation, and therefore should not be understood as a limitation of the present invention.

[0023] It should be noted that the terms "first" and "second" are used for convenience of description only and cannot be understood as indicating or implying relative importance or the quantity of technical features. Thus, features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, "plurality" means two or more than two, unless expressly limited otherwise.

[0024] Additionally, terms such as "horizontal" and "vertical" do not necessarily mean that a member needs to be perfectly horizontal or suspended, but may be slightly tilted. For example, "horizontal" simply means that the direction is more horizontal than "vertical," and does not mean that the structure must be perfectly horizontal, but may be slightly tilted. [Example]

[0025] As shown in Figure 2, this embodiment provides a valve hard seal structure including a seat ring 2 for sealing the seat ring hole of a soot blower valve body and a valve disc, where the seat ring 2 has an annular structure, a chamfered portion is provided at the lower end of the seat ring 2, and the chamfered portion has a double chamfered structure, the seat ring 2 is extruded and positioned in the seat ring hole of the valve body, one end of the seat ring hole of the valve body is connected to the intake port and the other end is connected to the exhaust port, and the valve disc is extruded and positioned in the seat ring 2.

[0026] As shown in FIG. 3, the double chamfer structure includes a straight bottom edge 21, a first straight chamfered edge 22, a second straight chamfered edge 23, and a straight outer edge 24, which are connected in order, and the angle between the first straight chamfered edge 22 and the second straight chamfered edge 23 is an obtuse angle.

[0027] In this embodiment, the angle between the first straight chamfered edge 22 and the straight base edge 21 is 20 degrees. The angle between the second straight chamfered edge 23 and the straight base edge 21 is 45 degrees. The distance between the intersection of the second straight chamfered edge 23 and the straight outer edge 24 and the straight base edge 21 is 1 cm. The distance between the intersection of the straight base edge 21 and the first straight chamfered edge 22 and the straight outer edge 24 is 2 cm. A gap large enough to accommodate burrs and dirt remaining inside the valve is left at the bottom of the seat ring to prevent dirt from affecting the smoothness of the sealing surface and the sealing effect of the seat ring.

[0028] Specifically, the seat ring 2 is tightly fitted into the seat ring hole of the valve body. The hardness of the seat ring 2 is greater than that of the valve body. The seat ring and seat ring hole bracket are fully extruded, and the greater hardness of the seat ring effectively removes burrs and other imperfections from the inner wall of the seat ring hole.

[0029] As shown in Figure 3, this embodiment also provides a long-slide sootblower that includes the above-mentioned valve hard seal structure. When combined with the above-mentioned hard seal structure, the operating principle of the long-slide sootblower is to first press the seat ring into the seat ring hole in the valve body and then perform a seal test. After the entire sootblower is installed and an operation command is issued, the motor is energized, causing the sootblower's wall box to move forward, driving the valve opening mechanism. The external force on the pressure rod acts on the valve cap, compressing the spring, causing the valve stem to move downward. The valve disc and valve seat ring at the bottom of the valve stem separate, opening the valve. Sootblowing steam flows in through the inlet, passes through the seat ring hole, and flows out through the outlet. When the sootblower's wall box returns to its original position, the external force on the pressure rod is removed, causing the spring to automatically rebound, causing the valve stem to move upward, bringing the valve disc and seat ring into tight contact and closing the sootblower valve.

[0030] The preferred embodiments of the present invention have been described in detail above. It should be understood that those skilled in the art can make many modifications and changes based on the concept of the present invention without any creative efforts. Therefore, any technical solution that those skilled in the art can obtain based on the concept of the present invention and the prior art through logical analysis, reasoning, or limited experiments should fall within the scope of protection defined by the claims.

Claims

1. 1. A valve hard seal structure comprising a seat ring (2) for sealing between a seat ring hole of a sootblower valve body and a valve disc, wherein the seat ring (2) has an annular structure, a chamfered portion is provided at the lower end of the seat ring (2), the chamfered portion has a double chamfer structure, the seat ring (2) is extruded into the seat ring hole of the valve body, one end of the seat ring hole of the valve body is connected to an intake port, and the other end is connected to an exhaust port, and the valve disc is extruded into the seat ring (2).

2. 2. The valve hard seal structure according to claim 1, wherein the double chamfer structure comprises a straight bottom edge (21), a first straight chamfer edge (22), a second straight chamfer edge (23) and a straight outer edge (24) connected in order, and the angle between the second straight chamfer edge (23) and the first straight chamfer edge (22) is an obtuse angle.

3. The valve hard seal structure according to claim 2, wherein the angle between the first straight chamfered edge (22) and the straight bottom edge (21) is in the range of 15 to 25 degrees.

4. The valve hard seal structure is characterized in that the angle between the straight chamfered side (23) and the straight bottom side (21) is in the range of 40 to 50 degrees.

5. The valve hard seal structure according to claim 2, wherein the distance between the intersection of the second straight chamfered side (23) and the straight outer side (24) and the straight bottom side (21) is in the range of 1 to 2 cm.

6. The valve hard seal structure according to claim 2, wherein the distance between the intersection of the straight bottom side (21) and the first straight chamfered side (22) and the straight outer side (24) is in the range of 1 to 3 cm.

7. 2. The valve hard seal structure according to claim 1, wherein the seat ring (2) is interference-fitted into the seat ring hole of the valve body.

8. 2. The valve hard seal structure according to claim 1, wherein the hardness of the seat ring (2) is higher than the hardness of the valve body.

9. A long-slide type soot blower comprising the valve hard seal structure according to any one of claims 1 to 8.

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