A demister square tube end cap

Abstract

The utility model discloses a kind of mist eliminator square tube plug, including plug body, plug body is right prism structure, the lower part of plug body is provided with notched, notched vertically extends from the lower end surface of plug body and forms rectangle structure, the cross section of notched is square structure.In the utility model, by using the right prism structure of small upper and large lower, cooperate with the limited elastic deformation ability of glass fiber reinforced polypropylene material, plug body can be self-adapting square tube inner wall within certain dimensional tolerance range, realize gradual fitting, without repeatedly adjusting when installing, only need to be initially in place by simple knocking, greatly reduce the dependence on operator skill, improve on-site installation efficiency.

Description

Technical Field

[0001] This utility model relates to the field of demisting equipment technology, and more specifically, to a square tube plug for a demisting device. Background Technology

[0002] In wet flue gas desulfurization systems, the demister is a key piece of equipment. Its internal structure typically uses square tubing as a support structure, with carbon steel pipes embedded within the square tubing to enhance overall strength. To prevent slurry from seeping into the square tubing from the ends and corroding the tube walls, thus affecting structural safety and service life, plugs need to be installed at the ends of the square tubing for sealing.

[0003] Currently, common demister square tube plugs are mostly made of ordinary polypropylene sheet with a thickness of 5-10mm. After being inserted into the end of the square tube, they are fixed by welding with welding rods. This method has the following obvious defects:

[0004] 1. Installation difficulties: Due to the varying inner wall dimensions of square tubes, thin plates often require multiple adjustments to achieve a match, resulting in low installation efficiency and high skill requirements for operators;

[0005] 2. Unreliable sealing: There is a gap between the plug and the inner wall of the square tube, and the seal may still fail due to vibration after welding;

[0006] 3. Insufficient structural strength: The plug is fixed by welding only, and it is easy to fall off when subjected to external impact during hoisting, transportation or operation, which affects the overall structural stability.

[0007] Therefore, a new solution is needed to address this problem. Utility Model Content

[0008] The purpose of this utility model is to overcome the shortcomings of the prior art and provide a demister square tube plug that is easy to install, has reliable sealing, high structural strength, and long service life.

[0009] To achieve the above objectives, the present invention adopts the following technical solution:

[0010] A square tube plug for a demister includes a plug body, the plug body having a frustum structure, a slot being provided at the lower part of the plug body, the slot extending vertically upward from the lower end face of the plug body to form a rectangular structure, and the cross-section of the slot having a square structure.

[0011] Furthermore, the slot is coaxially arranged with the plug body.

[0012] Furthermore, the plug body is formed into a one-piece, solid structure through injection molding.

[0013] Furthermore, the thickness of the groove is two-thirds of the height of the plug body.

[0014] Furthermore, the upper end face of the plug body has a side length of 35.7cm, the lower end face has a side length of 41cm, its height is 15cm, the groove has a side length of 31cm, and its thickness is 10cm.

[0015] Furthermore, the plug body is a glass fiber reinforced polypropylene plug.

[0016] The beneficial effects of this utility model are:

[0017] 1. In this utility model, by adopting a truncated pyramid structure with a smaller top and a larger bottom, and using glass fiber reinforced polypropylene material with limited elastic deformation capability, the plug body can adapt to the inner wall of the square tube within a certain dimensional tolerance range, achieving a gradual fit. During installation, there is no need for repeated adjustments; it can be initially positioned with just a simple tap, which greatly reduces the dependence on the operator's skills and improves on-site installation efficiency.

[0018] 2. In this utility model, the plug body is a solid structure, which fundamentally eliminates the possibility of slurry leakage through the inside of the plug; at the same time, the initial contact pressure is generated between it and the square tube through interference fit, and then supplemented by the perimeter full welding, forming a strong mechanical and material double seal, which effectively resists vibration and pressure fluctuation during operation and prevents slurry leakage.

[0019] 3. In this utility model, the plug body is a solid structure integrally injection molded, which, combined with the high strength and high rigidity of glass fiber, gives the plug body excellent impact resistance, deformation resistance and creep resistance. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the main structure of the square tube plug of the demister in this embodiment;

[0021] Figure 2 This is a cross-sectional view of the square tube plug of the demister in this embodiment;

[0022] Figure 3 This is a top view of one of the square tube plug structures of the demister in this embodiment;

[0023] Figure 4 This is a bottom view of the square tube plug of the demister in this embodiment.

[0024] Attachment labels: 1. Plug body; 2. Groove. Detailed Implementation

[0025] 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.

[0026] Example: A square tube plug for a demister, such as Figures 1-4 As shown, the device includes a plug body 1, which is a regular frustum structure, including an upper end face, a lower end face, and four trapezoidal side faces. The side length of the upper end face is 35.7cm, the side length of the lower end face is 41cm, and the height is 15cm. This gradient design allows it to adapt to the inner wall of square tubes of different sizes during installation, achieving a gradual fit and improving the sealing effect.

[0027] Furthermore, such as Figure 2 and Figure 4 As shown, the lower part of the plug body 1 is provided with a slot 2. The slot 2 extends vertically upward from the lower end face of the plug body 1 and forms a rectangular structure. The cross-section of the slot 2 is a square structure.

[0028] By setting a groove 2 at the lower part of the plug body 1, firstly, it facilitates demolding and improves the flow path of the melt in the cavity during injection molding, making the wall thickness more uniform and improving the dimensional stability and appearance quality of the product; secondly, it achieves lightweighting, reduces material costs, and helps to homogenize internal stress, reducing the risk of failure due to stress cracking during long-term use.

[0029] Preferably, the slot 2 is coaxially arranged with the plug body 1, that is, the slot 2 is located at the center of the plug body 1; this structural design can make the wall thickness around the perimeter more uniform, and at the same time can serve as a centering guide structure during installation, which is convenient for positioning.

[0030] Preferably, the plug body 1 is formed into a one-piece, solid structure through injection molding. By using one-piece injection molding, the consistency of the plug body 1 is ensured, and each plug body 1 is a continuous whole, resulting in uniform stress distribution under load and preventing cracking due to splicing. The solid structure serves several purposes: first, it eliminates any internal channels or cavities through which grout can flow; grout can only seep in from the interface between the plug body 1 and the square tube, which is sealed by welding; second, it provides high compressive and bending stiffness and impact toughness, preventing detachment during hoisting, transportation, or operation due to external impacts; and third, the solid, dense structure more effectively resists slow plastic changes in the material, ensuring long-term effective interference fit pressure between it and the square tube, resulting in a durable seal.

[0031] Preferably, the plug body 1 is a glass fiber reinforced polypropylene plug. Polypropylene is a thermoplastic with good toughness and a certain degree of resilience, possessing the ability to undergo small, recoverable deformation under stress. By adding glass fiber, the strength, stiffness, and dimensional stability of polypropylene are improved, enabling it to withstand larger loads without permanent deformation. The plug body 1 is made of glass fiber reinforced polypropylene, which has excellent resistance to acid and alkali corrosion and impact resistance, making it suitable for demisters operating in humid conditions.

[0032] When the plug body 1 is hammered into the square tube, a slight, instantaneous elastic compression or bending occurs. This deformation allows the plug body 1 to enter smoothly and, after being in place, to tightly adhere to the square tube wall by relying on the rebound force of the material, forming an interference fit initial seal, thus providing a stable base for subsequent welding.

[0033] Furthermore, the thickness of the groove 2 is two-thirds of the height of the plug body 1. Preferably, the side length of the groove 2 is 31cm and its thickness is 10cm. By adopting the above design, while ensuring that a border with sufficient strength and rigidity is formed around the groove 2 (this border is used to withstand the hammering force during installation and serves as the main load-bearing frame), the groove 2 is made as large as possible to ensure demolding without damage.

[0034] The installation steps for the plug body 1 are as follows:

[0035] 1. Surface treatment: Use a scraper or wire brush to clean the inner wall of the square tube end to remove oxide layer, dust and oil stains, and ensure that the bonding surface is clean and dry;

[0036] 2. Preliminary installation: Align the plug body 1 with the end of the square tube and tap it with a wooden mallet to gradually embed the plug body 1 into the square tube. The embedding depth should be controlled at about 5mm to ensure tight contact. Preferably, when tapping with a wooden mallet, a flat wooden board or special pad can be placed in the groove 2 and the pad can be tapped with a wooden mallet to disperse the tapping force.

[0037] 3. Welding and fixing: Use a plastic welding gun with polypropylene welding rods to weld around the perimeter where the end cap contacts the square tube. The weld should be continuous and uniform, without any missed welds or incomplete welds.

[0038] 4. Curing inspection: After welding, let stand for more than 1 hour to allow the weld to fully cure; after curing, gently shake the plug body 1 to confirm that there is no looseness, clean the excess welding slag at the weld, and complete the installation.

[0039] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A square tube plug for a demister, comprising a plug body (1), characterized in that, The plug body (1) has a regular frustum structure. A slot (2) is provided at the lower part of the plug body (1). The slot (2) extends vertically upward from the lower end face of the plug body (1) and forms a rectangular structure. The cross-section of the slot (2) is a square structure.

2. The demister square tube plug according to claim 1, characterized in that, The slot (2) is coaxially arranged with the plug body (1).

3. A demister square tube plug according to claim 1, characterized in that, The plug body (1) is formed into a one-piece solid structure by injection molding.

4. A demister square tube plug according to claim 1, characterized in that, The thickness of the slot (2) is two-thirds of the height of the plug body (1).

5. A demister square tube plug according to claim 1, characterized in that, The upper side of the plug body (1) has a side length of 35.7cm, the lower side has a side length of 41cm, and its height is 15cm. The side length of the groove (2) is 31cm, and its thickness is 10cm.

6. A demister square tube plug according to claim 1, characterized in that, The plug body (1) is a glass fiber reinforced polypropylene plug.

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