Boiler hood

Abstract

The utility model belongs to the technical field of air caps, and particularly relates to a boiler air cap which comprises an air cap and an air pipe, the air cap is arranged on the top of the air pipe in a sleeved mode, and a step used for supporting the air cap is arranged on the air pipe. An air hole is formed in the bottom of the air cap, a communicating hole is formed in the top of the air pipe, the air pipe is sleeved with an elastic connecting ring, the elastic connecting ring comprises a fixed ring and a deformation ring, and the fixed ring is fixedly connected with the air pipe; the deformation ring is fixedly connected with the fixed ring through a connecting rib; the outer side of the deformation ring is provided with a protruding part making contact with the inner side of the hood. The hood sleeves the top of the air pipe, then is in contact with the lug boss and extrudes the deformation ring to generate elastic deformation; and a groove part matched with the lug boss is arranged on the inner side of the air cap. During installation, the air cap is arranged on the top of the air pipe in a sleeving mode, then makes contact with the protruding part and extrudes the deformation ring to generate elastic deformation; and then the air cap is rotated to enable the convex part to rotate into the groove part, so that the clamping connection between the air cap and the air pipe is realized.

Description

Technical Field

[0001] This utility model belongs to the field of wind cap technology, specifically relating to a boiler wind cap. Background Technology

[0002] Boiler air caps are crucial air distribution devices, primarily used in circulating fluidized bed boilers, playing a vital role in their safe and economical operation. The main function of the air cap is to evenly distribute air into the boiler furnace to achieve fuel fluidization and combustion. Common types of air caps include bell-shaped, umbrella-shaped, conical, and mushroom-shaped air caps.

[0003] In circulating fluidized bed boilers, the air cap is a vulnerable component in high-temperature and high-wear environments, therefore it needs to be manufactured using wear-resistant and heat-resistant materials.

[0004] The air cap and air duct are fixed by welding or by using a sleeve (utilizing its own weight); however, the air cap may fall off during use. To address this, patent application number 201822123913.9 discloses an easily replaceable air cap for a circulating fluidized bed boiler air distributor plate. The upper part of the air duct has a threaded end, and the air cap has an air cap hole through which a threaded fixing part passes and connects to the threaded end. A sealing mechanism is provided at the connection between the fixing part and the air cap hole. The connection between the two is achieved using bolts. This structure requires replacement of the matching air duct and cannot be used on existing air ducts; furthermore, the top sealing issue needs to be considered, and a corresponding sealing gasket is provided. Utility Model Content

[0005] To address the aforementioned technical problems, this utility model provides a boiler duct cap that uses a snap-fit ​​method to achieve a detachable and fixed connection, and can be used on existing air ducts.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0007] A boiler vent cap includes a vent cap and a duct. The vent cap is fitted onto the top of the duct, and the duct has a step for supporting the vent cap. The bottom of the vent cap has an air hole, and the top of the duct has a connecting hole. An elastic connecting ring is fitted over the duct, the elastic connecting ring including a fixed ring and a deformable ring. The fixed ring is fixedly connected to the duct. The deformable ring is fixedly connected to the fixed ring by a connecting rib. The outer side of the deformable ring has a protrusion that contacts the inner side of the vent cap. After the vent cap is fitted onto the top of the duct, it contacts the protrusion and compresses the deformable ring, causing elastic deformation. The inner side of the vent cap has a groove that mates with the protrusion.

[0008] It also includes a fixing screw, the deformable ring is provided with a limiting groove, and the connecting rib is provided with a threaded through hole; the end of the fixing screw passes through the limiting groove and the threaded through hole and abuts against the outer wall of the air duct.

[0009] The wind cap is equipped with a limiting plate inside, which can move downward through the limiting groove.

[0010] There are four of each of the limiting grooves and limiting plates.

[0011] The fixing screw is any one of the following: a flathead screw, a cross screw, or an internal hex screw.

[0012] There are four protrusions and four grooves.

[0013] The protrusion is an arc-shaped protrusion, and the groove is an arc-shaped groove.

[0014] The air vent is waist-shaped; the connecting hole is a circular hole, arranged in two rows in a ring.

[0015] Compared with the prior art, the advantages of this utility model are:

[0016] During installation, the vent cap is placed on top of the duct, contacting the protrusion and compressing the deformation ring to induce elastic deformation. Then, the vent cap is rotated so that the protrusion enters the groove, thus achieving a snap-fit ​​connection between the vent cap and the duct. The engagement between the protrusion and the groove restricts the upward movement of the vent cap, preventing it from falling off.

[0017] Meanwhile, the flexible connecting ring structure allows for the installation of existing ductwork without the need to replace it.

[0018] A limit plate is installed to further restrict the upward movement of the hood. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0020] Figure 2 This is a partial sectional view of the present invention;

[0021] Figure 3 yes Figure 2 A magnified view of a section at point A in the middle;

[0022] Figure 4 This is a schematic diagram of the connection structure between the air duct and the elastic connecting ring of this utility model;

[0023] Figure 5 This is a schematic diagram of the structure of the elastic connecting ring of this utility model;

[0024] Figure 6 This is a schematic diagram of the structure of the windproof cap of this utility model;

[0025] Among them: 1 is the hood, 2 is the duct, 3 is the step, 4 is the vent, 5 is the connecting hole, 6 is the elastic connecting ring, 7 is the fixing ring, 8 is the deformable ring, 9 is the connecting rib, 10 is the protrusion, 11 is the groove, 12 is the fixing screw, 13 is the limiting groove, 14 is the limiting plate, and 15 is the scale mark. Detailed Implementation

[0026] The technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments.

[0027] like Figure 1-6 As shown, a boiler vent cap includes a vent cap 1 and a duct 2. The vent cap 1 is fitted onto the top of the duct 2, and the duct 2 has a step 3 for supporting the vent cap 1. The bottom of the vent cap 1 has an air hole 4, and the top of the duct 2 has a connecting hole 5. The above is a common structural arrangement in the prior art.

[0028] An elastic connecting ring 6 is provided on the outer sleeve of the duct 2. The elastic connecting ring 6 includes a fixed ring 7 and a deformable ring 8. The fixed ring 7 is fixedly connected to the duct 2. The deformable ring 8 is fixedly connected to the fixed ring 7 by a connecting rib 9. The outer side of the deformable ring 8 is provided with a protrusion 10 that contacts the inner side of the hood 1. The inner side of the hood 1 is provided with a groove 11 that mates with the protrusion 10.

[0029] During installation, the hood is first fixedly connected to the duct 2 using the retaining ring 7. After the hood 1 is placed on top of the duct 2, the inner wall of the hood 1 contacts the protrusion 10 and compresses the deformation ring 8, causing elastic deformation. Then, the hood 1 is rotated until the protrusion 10 extends into the groove 11 (the deformation ring 8 releases its elastic potential energy), thus achieving a snap-fit ​​connection between the hood 1 and the duct 2. For disassembly, the hood 1 is rotated in the opposite direction, causing the protrusion 10 to move out of the groove 11. The deformation ring 8 is compressed and deformed, and then the hood 1 can be lifted to remove it. The engagement between the protrusion 10 and the groove 11 restricts the upward movement of the hood 1, preventing it from detaching from the duct 2.

[0030] Furthermore, for ease of installation, a fixing screw 12 is included, a limiting groove 13 is provided on the deformable ring 8, and a threaded through hole is provided on the connecting rib 9. During installation, after the fixing ring 7 is fitted onto the air duct 2, the fixing screw 12 is tightened, and the end of the fixing screw 12 passes through the limiting groove 13 and the threaded through hole and abuts against the outer wall of the air duct 2.

[0031] Furthermore, to further restrict the upward movement of the hood 1, a limiting plate 14 is provided inside the hood 1, which can move downward through the limiting groove. During the installation process of the hood 1 being fitted onto the top of the duct 2, the limiting plate 14 moves downward through the limiting groove; when the hood 1 is rotated so that the protrusion 10 moves into the groove 11, the limiting plate 14 is misaligned with the limiting groove, that is, the deformation ring 8 will block the upward movement of the limiting plate 14, thereby restricting the upward movement of the hood 1.

[0032] During disassembly, the hood 1 is rotated in the reverse direction to move the protrusion 10 out of the groove 11. Once the limiting plate 14 aligns with the limiting groove, the hood 1 can be removed. Specifically, during the reverse rotation of the hood 1, an upward pulling force is applied simultaneously, causing the limiting plate 14 to contact the lower surface of the deformable ring 8 until it rotates to the limiting groove, thereby removing the hood 1. During installation, the same principle applies: during the rotation of the hood, a downward force is applied, causing the limiting plate 14 to contact the upper surface of the deformable ring 8 until it rotates to the limiting groove. Alternatively, graduations 15 corresponding to the limiting plate 14 and the limiting groove can be marked on the outside of the hood 1 and on the branch pipes to facilitate alignment of the limiting plate 14 with the limiting groove.

[0033] Furthermore, the number of limiting grooves 13 and limiting plates 14 is set according to the actual situation, preferably four of each.

[0034] Furthermore, the fixing screw 12 is any one of a slotted screw, a cross screw, or an internal hex screw.

[0035] Furthermore, as above, both the protrusions 10 and the grooves 11 are preferably provided in four portions.

[0036] Furthermore, the protrusion 10 is an arc-shaped protrusion, and the groove 11 is an arc-shaped groove.

[0037] Furthermore, the shape of the air vent 4 is waist-shaped; the connecting hole 5 is a circular hole with two rows of ring-shaped holes.

[0038] The above description only describes the preferred embodiments of the present invention, but the present invention is not limited to the above embodiments.

Claims

1. A boiler vent cap, characterized in that: The device includes a hood (1) and a duct (2). The hood (1) is fitted on the top of the duct (2). The duct (2) has a step (3) for supporting the hood (1). The hood (1) has a vent (4) at the bottom. The duct (2) has a connecting hole (5) at the top. The duct (2) is fitted with an elastic connecting ring (6). The elastic connecting ring (6) includes a fixing ring (7) and a deformable ring (8). The fixing ring (7) is fixedly connected to the duct (2). The deformable ring (8) is fixedly connected to the fixing ring (7) by a connecting rib (9). The outer side of the deformable ring (8) has a protrusion (10) that contacts the inner side of the hood (1). After the hood (1) is fitted on the top of the duct (2), it contacts the protrusion (10) and squeezes the deformable ring (8) to undergo elastic deformation. The inner side of the hood (1) has a groove (11) that cooperates with the protrusion (10).

2. A boiler wind cap according to claim 1, characterized in that: It also includes a fixing screw (12), a limiting groove (13) on the deformable ring (8), and a threaded through hole on the connecting rib (9); the end of the fixing screw (12) passes through the limiting groove (13) and the threaded through hole and abuts against the outer wall of the air duct (2).

3. A boiler wind cap according to claim 2, characterized in that: The wind cap (1) is provided with a limiting plate (14) inside, which can move down through the limiting groove.

4. A boiler wind cap according to claim 2, characterized in that: The limiting groove (13) and the limiting plate (14) are each provided with four.

5. A boiler wind cap according to claim 2, characterized in that: The fixing screw (12) is any one of a slotted screw, a cross screw, or an internal hexagonal screw.

6. A boiler wind cap according to claim 1, characterized in that: The protrusions (10) and grooves (11) are each provided in four parts.

7. A boiler wind cap according to claim 6, characterized in that: The protrusion (10) is an arc-shaped protrusion, and the groove (11) is an arc-shaped groove.

8. A boiler wind cap according to claim 1, characterized in that: The air vent (4) is waist-shaped; the connecting hole (5) is a circular hole with two rows arranged in a ring.

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