Hot air pipeline pull rod device with compensation function

Abstract

The invention belongs to the technical field of hot air pipeline equipment, and particularly relates to a hot air pipeline pull rod device with a compensation function, which comprises a first seat ring, a second seat ring and a third seat ring, the second seat ring is fixed on the outer wall, far away from the blind end, of the hot air pipeline; the compensation mechanism is fixed to the end face, close to the blind end of the hot air pipeline, of the first seat ring. The axis direction of the pull rods is parallel to the axis direction of the hot air pipeline, the pull rods are evenly arranged outside the hot air pipeline in the circumferential direction of the hot air pipeline and sequentially penetrate through the compensation mechanism, the first seat ring and the second seat ring, and the two ends of the pull rods are correspondingly connected with the compensation mechanism and the second seat ring. The problems that an existing compensator is complex in construction technology, pipeline integrity is damaged, the engineering cost is high, and the structural complexity of a hot air pipeline system is increased are solved.

Description

Technical Field

[0001] This invention belongs to the technical field of hot air duct equipment, and in particular relates to a hot air duct tie rod device with compensation function. Background Technology

[0002] The hot blast stove system is one of the important auxiliary systems in the blast furnace ironmaking process. The high-temperature hot blast produced by the hot blast stove is transported to the blast furnace through hot blast ducts. Therefore, the hot blast ducts need to be rationally designed to match the high-temperature, high-pressure hot blast medium transport. During normal production, the temperature inside the hot blast ducts is approximately 1200℃, and the ducts are relatively long. Because the inside of the hot blast ducts needs to be filled with heat-resistant insulation materials and lined with bricks (collectively referred to as refractory materials), large deformation of the duct system is not allowed. However, due to the large cross-sectional area of ​​the hot blast medium and the high pressure of the medium, a huge internal pressure thrust, commonly known as blind flange force, is generated at the ends of the ducts and at points where the duct direction changes during production. This force can generally reach hundreds of tons, especially in large blast furnaces. Therefore, the force balance of the hot blast duct system is crucial for the safe and stable production of the hot blast duct. To prevent deformation of the hot blast duct system caused by blind flange force, a through-type tie rod device is installed on the hot blast duct. The two ends of the tie rod are fixedly supported on the outer wall of the hot blast duct by seat rings. The tension of the tie rod is used to balance the blind flange force of the duct, preventing the duct from undergoing tensile deformation under the action of the blind flange force. However, because the tie rod is close to the hot air duct, it will also expand due to heat radiation. If this expansion cannot be compensated for, the hot air duct will still be affected by the blind flange force, leading to safety issues. Therefore, an independent compensator needs to be installed on each hot air duct system to compensate for the expansion of the tie rod.

[0003] However, existing compensators involve complex construction processes, can compromise the integrity of the pipeline during installation, and require additional auxiliary equipment to mitigate their negative effects in hot air duct systems, further increasing the structural complexity of the system. Therefore, there is a need to explore a simple, reliable, and easy-to-install tie rod device for hot air duct systems to address the problems of existing technologies.

[0004] The information disclosed in this background section is intended only to enhance the understanding of the overall background of the invention and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention

[0005] The purpose of this invention is to solve the problems of existing compensators, such as complex structure, complicated construction process, and damage to the integrity of the pipeline, and to provide a hot air duct tie rod device with compensation function. The specific details are as follows:

[0006] A hot air duct tie rod device with compensation function, comprising:

[0007] The first ring is fixed to the outer wall of the hot air duct near the blind end of the hot air duct.

[0008] The second ring is fixed on the outer wall of the hot air duct away from the blind end;

[0009] The compensation mechanism is fixed on the end face of the first seat ring near the blind end of the hot air duct;

[0010] There are several tie rods, with their axes parallel to the axis of the hot air duct. They are evenly arranged around the outside of the hot air duct along its circumference and pass through the compensation mechanism, the first seat ring, and the second seat ring in sequence. Both ends are connected to the compensation mechanism and the second seat ring respectively.

[0011] Furthermore, the first bearing ring has the same number of first axial through holes as the pull rods, including:

[0012] The support ring has its inner circular surface fixedly connected to the outer wall of the hot air duct, and its outer surface has a reinforcing part.

[0013] Support plates are fixedly connected to both sides of the support ring;

[0014] The pull rod passes through the first axial through hole; the second seat ring has the same structure as the first seat ring.

[0015] Furthermore, the compensation mechanism is an elastic and stretchable structure, comprising:

[0016] The rear plate is fixedly connected to the end face of the first seat ring near the blind end of the hot air duct;

[0017] The compensation unit is fixedly connected to the end face of the rear plate near the blind end of the hot air duct;

[0018] The front plate is fixedly connected to the end face of the compensation section near the blind end of the hot air duct.

[0019] Furthermore, the rear plate, the compensation part, and the front plate are all provided with a central hole and a second axial through hole, and are all fitted onto the outer wall of the hot air duct through the central hole; the pull rod passes through the second axial through hole.

[0020] Furthermore, the compensation mechanism is an elastic and stretchable structure, comprising:

[0021] The rear plate is fixedly connected to the end face of the first seat ring near the blind end of the hot air duct;

[0022] The compensation unit is fixedly connected to the end face of the rear plate near the blind end of the hot air duct;

[0023] The front plate is fixedly connected to the end face of the compensation section near the blind end of the hot air duct;

[0024] The rear plate, the compensation section, and the front plate are all provided with a central hole and a second axial through hole, and are all fitted onto the outer wall of the hot air duct through the central hole; the tie rod passes through the second axial through hole; and an inner ring is provided inside the central hole of the compensation section.

[0025] The inner ring is fitted onto the outer wall of the hot air duct, with one end fixedly connected to the rear plate and the other end being a free end. Its outer surface is slidably connected to the compensation part and the center hole of the front plate.

[0026] Furthermore, the pull rod has a locking mechanism installed at one end and on both sides of the second seat ring, and a pressing mechanism installed at the other end on the side of the compensation mechanism near the blind end of the hot air duct.

[0027] Furthermore, the compensation mechanism includes:

[0028] The rear plate is fixedly connected to the end face of the first seat ring near the blind end of the hot air duct;

[0029] The compensation unit is fixedly connected to the end face of the rear plate near the blind end of the hot air duct;

[0030] The front plate is fixedly connected to the end face of the compensation section near the blind end of the hot air duct;

[0031] The elastic part has one end fixed to the end face of the front plate away from the blind end of the hot air duct, and the other end fixed to the end face of the rear plate near the blind end of the hot air duct.

[0032] The rear plate, the compensation section, and the front plate are all provided with a central hole and a second axial through hole, and are all fitted onto the outer wall of the hot air duct through the central hole; the tie rod passes through the second axial through hole; the compensation section has an inner ring inside its central hole;

[0033] The inner ring is fitted onto the outer wall of the hot air duct, with one end fixedly connected to the rear plate and the other end being a free end. Its outer surface is slidably connected to the compensation part and the center hole of the front plate.

[0034] Furthermore, the compensation part adopts a compressible tubular structure, which is in a free state before installation and in a compressed state after installation.

[0035] Furthermore, the elastic part comprises several units, which are evenly arranged along the circumference of the hot air duct.

[0036] Furthermore, there are multiple elastic portions; the multiple pull rods pass through the multiple elastic portions respectively. Compared with the prior art, the technical effects achieved by the present invention are as follows:

[0037] By combining a compensation mechanism with the first seat ring, which functions similarly to the compensator in the prior art, the structure of the tie rod device can be simplified, the construction process can be simplified, and the auxiliary equipment of the hot air duct can be reduced, providing a more economical and effective safety measure for the hot air furnace system. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the installation structure of the tie rod device and compensator in the case of continuous refractory laying at the blind end of the hot air duct in the existing technology;

[0039] Figure 2 This is a schematic cross-sectional view of the installation structure of the tie rod device and compensator in the case of continuous refractory laying at the blind end of the hot air duct in the existing technology;

[0040] Figure 3 This is a schematic diagram of the installation structure of tie rod device and compensator in the case of blind end of hot air duct without continuous refractory material;

[0041] Figure 4 This is a schematic cross-sectional view of the installation structure of tie rod device and compensator in the case of blind end of hot air duct without continuous refractory material;

[0042] Figure 5 This is a schematic diagram of the installation structure of the tie rod device according to an embodiment of the present invention;

[0043] Figure 6 This is a schematic cross-sectional view of the mounting structure of the tie rod device according to an embodiment of the present invention;

[0044] Figure 7 This is a schematic diagram of the structure of the first or second race of the pull rod device according to an embodiment of the present invention, wherein... Figure 7 A is the front view. Figure 7 B is the right view;

[0045] Figure 8 This is a schematic diagram of the compensation section of the tie rod device according to an embodiment of the present invention, wherein... Figure 8 A is the front view. Figure 8 B is the right view;

[0046] Figure 9 This is a schematic diagram of the overall structure of the pull rod device according to an embodiment of the present invention, wherein... Figure 9 A is a schematic diagram of the tie rod device in its compressed state. Figure 9 B is a schematic diagram of the tie rod device in its free state.

[0047] Explanation of key figure labels:

[0048] 1-First seat ring, 101-First axial through hole, 102-Support ring, 103-Support plate, 104-Reinforcing part, 2-Second seat ring, 3-Compensation mechanism, 301-Rear plate, 302-Compensation part, 303-Front plate, 304-Center hole, 305-Second axial through hole; 306-Inner ring, 307-Elastic part, 4-Pull rod, 401-Locking mechanism, 402-Pressure clamping mechanism, 5-Hot air duct, 6-Pull rod seat ring, 7-Refractory material, 8-Compensator, 9-Baffle plate, 10-Pressure balance pipe, 11-Fixed bracket, 12-Sliding bracket, 13-Hot air branch pipe, 14-Blind end. Detailed Implementation

[0049] Unless otherwise expressly stated, throughout the specification and claims, the term "comprising" or its variations such as "including" or "comprises" shall be understood to include the stated elements or components without excluding other elements or other components.

[0050] It should be noted that when a component is referred to as "fixed to," "placed," "equipped with," "provided with," "arranged on," or "connected to" another component, it can be directly on the other component or may have an intervening component. When a component is considered to be "connected" to another component, it can be directly connected to the other component or may have an intervening component present.

[0051] The technical solution of the present invention is illustrated below through specific embodiments. It should be understood that the one or more steps mentioned in the present invention do not preclude the existence of other methods and steps before or after the combined steps, or that other methods and steps may be inserted between these explicitly mentioned steps. It should also be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Unless otherwise stated, the numbering of each method step is only for the purpose of identifying each method step, and not for limiting the order of each method or limiting the scope of the present invention. Changes or adjustments to their relative relationships, without substantial changes to the technical content, can also be considered as within the scope of the present invention.

[0052] The raw materials and instruments used in the examples are not subject to any specific restrictions on their source; they can be purchased from the market or prepared according to conventional methods known to those skilled in the art.

[0053] Please refer to Figures 1-9 The following is shown to better understand the specific structure of the invention. A hot air duct 5 tie rod 4 device with compensation function, such as... Figure 5 , Figure 6 As shown, it includes:

[0054] The first ring 1 is fixed on the outer wall of the hot air duct 5 near the blind end 14;

[0055] The second ring 2 is fixed on the outer wall of the hot air duct 5 away from the blind end 14.

[0056] The compensation mechanism 3 is fixed on the end face of the first seat ring 1 near the blind end 14 of the hot air duct 5;

[0057] There are several pull rods 4, with their axial direction parallel to that of the hot air duct 5. They are evenly arranged around the outside of the hot air duct 5 along its circumference and pass through the compensation mechanism 3, the first seat ring 1, and the second seat ring 2 in sequence. Both ends are connected to the compensation mechanism 3 and the second seat ring 2 respectively.

[0058] It should be noted that, as Figure 1 As shown, in the prior art, to balance the blind flange force inside the hot air duct 5, especially at the duct end (blind end) or where the duct direction changes (such as at the location of the hot air branch pipe 13), a tie rod 4 needs to be installed outside the blind end 14 of the hot air duct 5 or at the location where the duct direction changes (e.g., at the joint of the hot air duct 5 branch pipe). Tie rod seats 6 are installed on the outer wall of the duct and at both ends of the tie rod 4 to provide support for the tie rod 4. The tension of the tie rod 4 is used to counteract the blind flange force inside the duct, preventing duct deformation that could damage the duct wall and the refractory material 7 inside the duct. However, the metal tie rod 4 is very close to the duct, and under the influence of heat radiation, the tie rod 4 itself will also expand due to heat. Even an expansion of a few centimeters can cause the duct to be damaged by the blind flange force, leading to safety issues. Therefore, to further balance the expansion length of the tie rod 4, a separate compensator 8 is needed.

[0059] In existing technologies, such as Figure 1 The compensators 8 shown all employ an embedded installation process. That is, the blind end 14 of the hot air duct 5 is fabricated in sections, and the compensator 8 is embedded in the duct wall by welding at both ends between the two sections. It is evident that this embedded installation process is relatively complex, requiring high precision in the weld seams; even a slight error can cause leakage of the high-temperature, high-pressure medium from the weld seam. Furthermore, the addition of the compensator 8 to the duct lengthens the overall duct, necessitating additional refractory material 7 lining, thus increasing construction costs. Moreover, embedding the compensator 8 into the duct can compromise the duct's integrity and even affect the entire hot air duct 5 system.

[0060] It should be noted that this invention abandons the separate compensator 8 structure found in the prior art. Instead, it combines the compensation mechanism 3, which has the same function as the existing compensator 8, with the tie rod seat ring 6. That is, the compensator 8 and the seat ring are integrated into one, and the compensator 8 is moved from inside the pipe wall to outside the pipe wall and merged with the tie rod seat ring 6. While ensuring the compensation function is achieved, it eliminates the need for a separate compensator 8, complex construction processes, additional refractory materials 7, and the need to manufacture the pipe in sections, thus maintaining the integrity of the pipe.

[0061] It should be noted that, as Figure 2 As shown, the hot air duct 5 in the prior art is internally lined with refractory material 7, and some refractory material 7 extends all the way to the blind end 14. When a compensator 8 is installed on this type of duct, the compensator 8 itself will expand and deform, which can cause the refractory material 7 to be stretched and damaged, resulting in the risk of leakage of high-temperature and high-pressure media.

[0062] It should be noted that, as Figure 3 , Figure 4 As shown, the refractory material 7 of some hot air ducts 5 is not laid to the end of the blind end 14. However, in order to maintain the integrity of the refractory material 7, a baffle 9 needs to be installed at the end of the refractory material 7. Although the refractory material 7 will not be damaged when the compensator 8 is stretched, this type of hot air duct 5 requires the additional installation of baffle 9 and pressure balancing pipe 10 (the pressure balancing pipe 10 is added to maintain the force balance on both sides of the baffle 9), which undoubtedly increases the construction cost.

[0063] It should be noted that, as Figure 2 , Figure 4 As shown, due to the presence of the compensator 8, the seat ring will be pushed to the right side of the figure after it is stretched. Therefore, in addition to setting the fixed bracket 11, a sliding bracket 12 also needs to be added to prevent deformation or damage to the connection structure due to the fixing of the seat ring.

[0064] This invention eliminates the compensator 8 structure and integrates the compensation mechanism 3 with the seat ring; the expansion and contraction deformation of the compensation mechanism 3 will not affect the structure of the hot air duct 5, avoiding the above-mentioned safety problems, and there is no need to set up additional equipment such as the partition 9, pressure balance pipe 10 and sliding support 12, thereby reducing costs.

[0065] It should be noted that, preferably, there are four tie rods 4 in this invention, which are evenly arranged outside the hot air duct 5. However, different numbers of tie rods 4 can be set according to actual needs.

[0066] It should be noted that the interval between the first seat ring 1 and the second seat ring 2 is based on the length of the pull rod 4, and in actual implementation, it needs to be set according to the structural dimensions of the hot air duct 5.

[0067] In the specific implementation of this embodiment, the compensation mechanism 3, which has the same function as the compensator 8 in the prior art, is combined with the first seat ring 1. In addition to being able to compensate for the expansion of the tie rod 4, it can also simplify the structure of the tie rod 4 device, simplify the construction process of installation, and reduce the auxiliary equipment of the hot air duct 5, providing a more economical and effective safety measure for the hot air furnace system.

[0068] In the embodiments provided by the present invention, such as Figure 7As shown, the first seat ring 1 has the same number of first axial through holes 101 as the pull rod 4, including:

[0069] The inner surface of the support ring 102 is fixedly connected to the outer wall of the hot air duct 5, and the outer surface is provided with a reinforcing part 104.

[0070] Support plate 103 is fixedly connected to both sides of support ring 102;

[0071] The pull rod 4 passes through the first axial through hole 101; the second seat ring 2 has the same structure as the first seat ring 1.

[0072] It should be noted that the inner circular surface of the support ring 102 is preferably fixed to the outer wall of the hot air duct 5 by welding.

[0073] It should be noted that the reinforcing part 104 is used to increase the strength of the seat ring, and can be welded to the outer side of the support ring 102 using a reinforcing rib structure.

[0074] It should be noted that the support plate 103 is preferably fixed to the support ring 102 by welding.

[0075] In the specific implementation of this embodiment, the two seat rings provide support for both ends of the pull rod 4, which can effectively prevent the hot air duct 5 from deforming under the action of the blind plate force and causing safety problems.

[0076] In one implementation, such as Figure 8 As shown, the compensation mechanism 3 is an elastic and stretchable structure, comprising:

[0077] The rear plate 301 is fixedly connected to the end face of the first seat ring 1 near the blind end 14 of the hot air duct 5;

[0078] The compensation unit 302 is fixedly connected to the end face of the rear plate 301 near the blind end 14 of the hot air duct 5;

[0079] The front plate 303 is fixedly connected to the end face of the compensation part 302 near the blind end 14 of the hot air duct 5;

[0080] The rear plate 301, the compensation part 302, and the front plate 303 are all provided with a central hole 304 and a second axial through hole 305, and are all fitted onto the outer wall of the hot air duct 5 with the central hole 304; the tie rod 4 passes through the second axial through hole 305; and an inner ring 306 is provided inside the central hole 304 of the compensation part 302.

[0081] The inner ring 306 is fitted onto the outer wall of the hot air duct 5. One end is fixedly connected to the rear plate 301, and the other end is a free end. Its outer surface is slidably connected to the central hole 304 of the compensation part 302 and the front plate 303.

[0082] It should be noted that the rear plate 301 is preferably fixed to the end face of the first seat ring 1 by welding.

[0083] It should be noted that the compensation part 302 is preferably fixed to the end face of the rear plate 301 by welding.

[0084] It should be noted that the front plate 303 is preferably fixed to the end face of the compensation part 302 by welding.

[0085] It should be noted that the compensation section 302 preferably adopts a bellows structure with elastic deformation capability, and can adopt the same structure as the elastic tube of the compensator 8 in the prior art.

[0086] It should be noted that the inner ring 306 serves as a guide, increasing the stability of the compensation part 302. One end of the inner ring 306 is preferably fixed to the rear plate 301 by welding, while the other end is a free end without connection, and its inner surface is attached to the outer wall of the hot air duct 5. During the expansion and contraction process, the compensation part 302, together with the front plate 303, can slide on the outer wall of the inner ring 306, thereby obtaining a more stable guiding and supporting effect. In addition, the inner ring 306 can effectively isolate the heat radiation of the hot air duct 5, preventing the compensation part 302 from expanding due to heat. More optimally, a heat insulation layer or reflective layer structure, as used in the prior art, can be provided on the inner surface of the inner ring 306 to increase the heat radiation protection performance.

[0087] In the specific implementation of this embodiment, an inner ring 306 is provided in the compensation mechanism 3, which can provide better guidance and support for the compensation part 302 and the front plate 303, and can effectively prevent and reduce the impact of heat radiation on the compensation part 302.

[0088] In the embodiments provided by the present invention, such as Figure 5 As shown, the pull rod 4 has a locking mechanism 401 installed at one end and on both sides of the second seat ring 2, and a pressing mechanism 402 installed at the other end of the compensation mechanism 3 on the side near the blind end 14 of the hot air duct 5.

[0089] It should be noted that both the locking mechanism 401 and the clamping mechanism 402 are preferably screw structures and can be connected to the threads at both ends of the pull rod 4. The purpose of setting the locking mechanism 401 is to fix the end of the pull rod 4 away from the blind end 14 to the second seat ring 2, thereby fixing it to the hot air duct 5. The purpose of setting the clamping mechanism 402 is to use the thread structure to compress the compensation mechanism 3 during installation, thereby achieving the preload required by the design, so that the compensation part 302 can extend and release the preload after the pull rod 4 expands due to heat, and continue to provide sufficient support for the pull rod 4.

[0090] In the specific implementation of this embodiment, the locking mechanism 401 and the pressing mechanism 402 provide a more stable structural foundation for the pull rod 4 device, thereby improving the safety of the hot air duct 5 system.

[0091] In one implementation, such as Figure 9 As shown, the compensation mechanism 3 includes:

[0092] The rear plate 301 is fixedly connected to the end face of the first seat ring 1 near the blind end 14 of the hot air duct 5;

[0093] The compensation unit 302 is fixedly connected to the end face of the rear plate 301 near the blind end 14 of the hot air duct 5;

[0094] The front plate 303 is fixedly connected to the end face of the compensation part 302 near the blind end 14 of the hot air duct 5;

[0095] The elastic part 307 is fixed at one end to the end face of the front plate 303 away from the blind end 14 of the hot air duct 5, and at the other end to the end face of the rear plate 301 near the blind end 14 of the hot air duct 5.

[0096] The rear plate 301, the compensation part 302, and the front plate 303 are all provided with a central hole 304 and a second axial through hole 305, and are all fitted onto the outer wall of the hot air duct 5 with the central hole 304; the tie rod 4 passes through the second axial through hole 305; and an inner ring 306 is provided inside the central hole 304 of the compensation part 302.

[0097] The inner ring 306 is fitted onto the outer wall of the hot air duct 5. One end is fixedly connected to the rear plate 301, and the other end is a free end. Its outer surface is slidably connected to the central hole 304 of the compensation part 302 and the front plate 303.

[0098] The compensation part 302 adopts a compressible tubular structure, which is in a free state before installation and in a compressed state after installation.

[0099] The elastic part 307 is a plurality of units, which are evenly arranged along the circumference of the hot air duct 5; the plurality of the pull rods 4 pass through the plurality of the elastic parts 307 respectively.

[0100] It should be noted that the compensation section 302 preferably adopts an elastic, foldable, and expandable pipe wall structure, with a cross-sectional shape as shown in the figure. Figure 9 As shown, an elastic metal material from the existing technology is used.

[0101] It should be noted that the elastic part 307 preferably has a helical spring structure, with both ends welded and fixed to the front plate 303 and the rear plate 301 respectively. Several elastic parts 307 can be evenly arranged around the periphery of the hot air duct 5, or they can adopt the same structure as this invention, i.e., coaxially arranged with the pull rod 4 (the pull rod 4 passes through the elastic part 307), which can reduce space occupation and optimize the structure. Adding the elastic part 307 can provide greater support force for the pull rod 4. Furthermore, the compensation part 302 adopts an elastic metal support foldable structure, which has a high cost. To meet the compensation requirements, a compensation part 302 with sufficient elasticity needs to be manufactured, thus increasing the wall thickness and volume of the compensation part 302, undoubtedly increasing manufacturing costs. Adding the elastic part 307 can share a certain degree of compensation effect, thus reducing the thickness and structural size of the compensation part 302, thereby achieving cost reduction.

[0102] It should be noted that the working principle of the pull rod 4 device of the present invention is as follows: before installation, the pull rod 4 device is in a free state, and both the compensation part 302 and the elastic part 307 are in a free extended state; the second seat ring 2 is fitted onto the hot air duct 5, and the second seat ring 2 is welded and fixed to the outer wall of the hot air duct 5; the first seat ring 1 and the compensation mechanism 3 are fitted onto the blind end 14 of the hot air duct 5, and the first seat ring 1 is welded and fixed to the outer wall of the hot air duct 5; the pull rod 4 is passed through the compensation mechanism 3, the first seat ring 1 and the second seat ring 2 in sequence; one end of the pull rod 4 is fixed to the second seat ring 2 using the locking mechanism 401; the clamping mechanism 402 is tightened at the end of the pull rod 4, and as the clamping mechanism 402 gradually tightens, the compensation part 302 and the elastic part 307 are compressed until the compression reaches the design amount, that is, the design pre-tightening force is reached, and the installation is completed, and the compensation mechanism 3 is in a compressed state; when the blind end 14 of the hot air duct 5... When impacted by the blind flange, force is applied to the blind end 14. Under the tension of the tie rod 4 (with the support provided by the seat rings at both ends), the blind flange force can be balanced, preventing damage to the hot air duct 5. When the tie rod 4 expands due to heat, its length will increase. If the compensation part 302 is not provided, the tie rod 4 will create a gap with the seat rings at both ends after it extends, thus losing the tension restriction on the hot air duct 5. The blind flange force will impact the hot air duct 5 and be transmitted to the tie rod seat ring 6, causing the hot air duct 5 and the tie rod seat ring 6 to be deformed and damaged by the impact. After the compensation part 302 is provided, the tie rod 4 will extend due to heat. Since the compensation part 302 and the elastic part 307 (the compensation part 302 can also achieve this function without the elastic part 307) have a pre-tightening force, it will extend under the action of the pre-tightening force. This absorbs the expansion of the tie rod 4, compensates for the gap between the tie rod 4 and the seat rings at both ends, and can continue to provide support for the tie rod 4, preventing damage to the hot air duct 5.

[0103] In the specific implementation of this embodiment, the elastic part 307 is provided, which can not only provide greater support for the tie rod 4, but also save costs for the overall structure, thereby providing strong protection for the hot air duct 5 system.

[0104] The foregoing description of specific exemplary embodiments of the invention is for illustrative and explanatory purposes. These descriptions are not intended to limit the invention to the precise forms disclosed, and it will be apparent that many changes and variations can be made in accordance with the foregoing teachings. The exemplary embodiments were chosen and described in order to explain the specific principles of the invention and its practical application, thereby enabling those skilled in the art to implement and utilize various different exemplary embodiments of the invention, as well as various different choices and variations. The scope of the invention is intended to be defined by the claims and their equivalents.

Claims

1. A hot air duct tie rod device with compensation function, characterized in that, include: The first ring is fixed to the outer wall of the hot air duct near the blind end of the hot air duct. The second ring is fixed on the outer wall of the hot air duct away from the blind end; The compensation mechanism is fixed on the end face of the first seat ring near the blind end of the hot air duct; There are several tie rods, with their axes parallel to the axis of the hot air duct. They are evenly arranged around the outside of the hot air duct along its circumference and pass through the compensation mechanism, the first seat ring, and the second seat ring in sequence. Both ends are connected to the compensation mechanism and the second seat ring respectively.

2. The hot air duct tie rod device with compensation function according to claim 1, characterized in that, The first bearing ring has the same number of first axial through holes as the number of tie rods, including: The support ring has its inner circular surface fixedly connected to the outer wall of the hot air duct, and its outer surface has a reinforcing part. Support plates are fixedly connected to both sides of the support ring; The pull rod passes through the first axial through hole; the second seat ring has the same structure as the first seat ring.

3. The hot air duct tie rod device with compensation function according to claim 1, characterized in that, The compensation mechanism is an elastic and stretchable structure, comprising: The rear plate is fixedly connected to the end face of the first seat ring near the blind end of the hot air duct; The compensation unit is fixedly connected to the end face of the rear plate near the blind end of the hot air duct; The front plate is fixedly connected to the end face of the compensation section near the blind end of the hot air duct.

4. The hot air duct tie rod device with compensation function according to claim 3, characterized in that, The rear plate, compensation section, and front plate are all provided with a central hole and a second axial through hole, and are all fitted onto the outer wall of the hot air duct through the central hole; the tie rod passes through the second axial through hole.

5. The hot air duct tie rod device with compensation function according to claim 1, characterized in that, The compensation mechanism is an elastic and stretchable structure, comprising: The rear plate is fixedly connected to the end face of the first seat ring near the blind end of the hot air duct; The compensation unit is fixedly connected to the end face of the rear plate near the blind end of the hot air duct; The front plate is fixedly connected to the end face of the compensation section near the blind end of the hot air duct; The rear plate, the compensation section, and the front plate are all provided with a central hole and a second axial through hole, and are all fitted onto the outer wall of the hot air duct through the central hole; the tie rod passes through the second axial through hole; the compensation section has an inner ring inside its central hole; The inner ring is fitted onto the outer wall of the hot air duct, with one end fixedly connected to the rear plate and the other end being a free end. Its outer surface is slidably connected to the compensation part and the center hole of the front plate.

6. The hot air duct tie rod device with compensation function according to claim 1, characterized in that, The pull rod has a locking mechanism installed at one end and on both sides of the second seat ring, and a pressing mechanism installed at the other end on the side of the compensation mechanism near the blind end of the hot air duct.

7. The hot air duct tie rod device with compensation function according to claim 1, characterized in that, The compensation mechanism includes: The rear plate is fixedly connected to the end face of the first seat ring near the blind end of the hot air duct; The compensation unit is fixedly connected to the end face of the rear plate near the blind end of the hot air duct; The front plate is fixedly connected to the end face of the compensation section near the blind end of the hot air duct; The elastic part has one end fixed to the end face of the front plate away from the blind end of the hot air duct, and the other end fixed to the end face of the rear plate near the blind end of the hot air duct. The rear plate, the compensation section, and the front plate are all provided with a central hole and a second axial through hole, and are all fitted onto the outer wall of the hot air duct through the central hole; the tie rod passes through the second axial through hole; the compensation section has an inner ring inside its central hole; The inner ring is fitted onto the outer wall of the hot air duct, with one end fixedly connected to the rear plate and the other end being a free end. Its outer surface is slidably connected to the compensation part and the center hole of the front plate.

8. The hot air duct tie rod device with compensation function according to claim 7, characterized in that, The compensation unit adopts a compressible tubular structure, which is in a free state before installation and in a compressed state after installation.

9. The hot air duct tie rod device with compensation function according to claim 7, characterized in that, The elastic part consists of several parts, which are evenly arranged along the circumference of the hot air duct.

10. The hot air duct tie rod device with compensation function according to claim 7, characterized in that, There are several elastic parts; several pull rods pass through several elastic parts respectively.

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