A steel inner tube chimney without flange flexible sealing connection

Abstract

The invention discloses a steel inner tube chimney with no flange-free flexible sealing connection, comprising: an inner tube and an outer tube, wherein the inner tube is formed by splicing an upper inner tube and a lower inner tube, and the outer tube is formed by splicing an upper outer tube and a lower outer tube, and the upper inner tube and the lower inner tube are connected by a retractable elastic sleeve assembly, and the retractable elastic sleeve assembly is composed of a spring assembly and a movable tube section, and the spring assembly comprises a pull rod fixing member, a pull rod, and a pull rod guide member, and a compression spring is sleeved on the pull rod, and a locking nut is installed after the lower end passes through the pull rod guide member; the movable tube section comprises a movable tube section straight section and a movable tube section cone section, and the top end of the lower inner tube has an inverted cone tube that is completely matched with the movable tube section cone section, and after the upper inner tube and the lower inner tube are installed, the movable tube section cone section is pressed and fitted on the inner side wall of the inverted cone tube under the action of the compression spring. The invention eliminates the flange installation of the inner tube, reduces the installation time, and improves the installation efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of steel structure chimneys, in particular to a steel inner tube chimney without flange-free flexible sealing connection. Background Art

[0002] At present, in the field of chimneys, especially in industrial chimneys, sleeve chimney structures are generally used when the height is less than 120m, and they are prefabricated in factories in multiple sections (generally 10~15m), and then transported to the site for hoisting. There are two main problems to be solved here: 1. The connection problem between the inner tubes of each section, which will affect the quality of the chimney's later operation, and also affect the economy and safety of the installation; 2. The problem of the wall thickness of the inner tube, which will affect the overall economy of the chimney.

[0003] The existing technology can be divided into the following categories:

[0004] 1. Each segment of the steel inner tube is connected by welding: This method is time-consuming and labor-intensive. Personnel must weld the inner tube at the segmented locations at high altitudes, which requires sufficient operating space. In addition, the upper tube segment must be suspended by a crane for a long time. Obviously, this method is inefficient and unsafe, and is not suitable for the connection and installation of sleeve-type chimneys.

[0005] 2. Each segment steel inner tube adopts flange connection: For sleeve-type chimney installation and connection, this method is currently almost universally used. The specific flange connection is divided into fixed flange connection, slip-on flange connection, and inserted flange connection. However, these forms of flange connection require operators to spend a long time tightening the bolts. In some cases, operators are required to enter between the inner and outer tubes to tighten the bolts. The construction efficiency is low and the safety is poor. Fixed flange connection and slip-on flange connection may also cause water leakage and air leakage, and the overall performance and quality of the chimney are not easy to guarantee.

[0006] 3. Wall thickness of the smoke exhaust inner tube: Existing sleeve-type chimneys all use a fixed bearing point for the inner tube at the bottom of the outer tube. The above parts are connected to the outer tube with active supports. The outer tube does not bear the weight of the inner tube, and the bottom of the inner tube bears the weight of all the inner tubes and their accessories. For the inner tube connected with fixed flanges and slip-on flanges, it is rigid at the segmented connection, and the bending deformation of the inner tube will be transmitted to the bottom. This makes the lower part of the inner tube wall thicker than the upper part during design. Moreover, the pipe orifice holes are generally opened in the lower part, so the lower part also needs to be reinforced. Generally, corrosion-resistant stainless steel or titanium steel is used for the steel inner tube. Increasing the wall thickness is equivalent to increasing the cost. Reinforcement will also put higher requirements on the process and increase the cost. Summary of the invention

[0007] The main technical problem solved by the present invention is to provide a steel inner tube chimney with a flange-free flexible sealing connection, which is easy to install and eliminates the flange installation of the inner tube, greatly reduces the installation time and improves the installation efficiency. The present invention provides a cylindrical sealing structure with a movable gap, which will not have the problems of smoke leakage and air leakage of traditional flanges.

[0008] In order to solve the above technical problems, a technical solution adopted by the present invention is: a steel inner tube chimney with no flange flexible sealing connection, comprising: an inner tube, an outer tube sleeved on the outer periphery of the inner tube, the inner tube is formed by splicing a plurality of upper inner tubes and lower inner tubes, the outer tube is formed by splicing a plurality of upper outer tubes and lower outer tubes, each of the upper inner tube and the lower inner tube is fixedly connected to the corresponding outer tube, the upper inner tube and the lower inner tube are connected by a retractable elastic sleeve assembly, the retractable elastic sleeve assembly is composed of a spring assembly and a movable tube section, the spring assembly includes a spring assembly arranged on the upper section A pull rod fixing part on the outside of the inner cylinder, a pull rod welded on the pull rod fixing part, and a pull rod guide part arranged on the outside of the movable cylinder section, a compression spring is sleeved on the pull rod, and a locking nut is installed after the lower end passes through the pull rod guide part; the movable cylinder section includes a movable cylinder section straight section sleeved on the outside of the upper inner cylinder and a movable cylinder section conical section located at the lower end of the movable cylinder section straight section, the top end of the lower inner cylinder has an inverted cone cylinder that is completely matched with the movable cylinder section conical section, after the upper inner cylinder and the lower inner cylinder are installed, the movable cylinder section conical section is pressed tightly against the inner wall of the inverted cone cylinder under the action of the compression spring.

[0009] In a preferred embodiment of the present invention, the movable cylinder section is sleeved on the outer side of the lower end of the upper inner cylinder, and the gap between the two is 2-3 mm.

[0010] In a preferred embodiment of the present invention, an air shield is provided at the middle portion of the outer side of the upper inner tube.

[0011] In a preferred embodiment of the present invention, the air shield is divided into two halves, which are respectively welded to the side walls of the upper inner cylinder.

[0012] In a preferred embodiment of the present invention, a flexible sealing material is filled between the air shield and the outer side wall of the upper inner cylinder.

[0013] In a preferred embodiment of the present invention, an air-blocking ring is welded to the inner side of the middle portion of the straight section of the movable cylinder segment.

[0014] In a preferred embodiment of the present invention, a sealing ring is welded to the outer side of the middle portion of the straight section of the movable cylinder segment. After the upper inner cylinder and the lower inner cylinder are installed, the inverted cone at the top of the lower inner cylinder abuts against the lower end surface of the sealing ring.

[0015] In a preferred embodiment of the present invention, the spring assembly includes 3-4 groups and is evenly distributed along the circumferential direction of the upper inner cylinder.

[0016] In a preferred embodiment of the present invention, the movable cylinder segment conical section is integrally formed at the lower end of the movable cylinder segment straight section.

[0017] In a preferred embodiment of the present invention, the upper outer cylinder and the lower outer cylinder are connected via a flange.

[0018] The beneficial effects of the present invention are: easy installation, eliminating the flange installation of the inner tube, greatly reducing the installation time, and improving the installation efficiency. The present invention provides a cylindrical sealing structure with a movable gap, which will not have the problems of smoke leakage and air leakage of traditional flanges; in addition, the technical solution of the steel inner tube chimney without flange flexible sealing connection provided by the present invention makes the wall thickness of the inner tube independent of the total height of the chimney, the design of the inner tube becomes simple, the material of the inner tube is reduced, and the production cost is saved. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work, among which:

[0020] Figure 1 It is a schematic diagram of the assembly structure of a steel inner tube chimney without flange-free flexible sealing connection according to the present invention;

[0021] Figure 2 It is a schematic diagram of the assembly structure of the upper inner cylinder and the telescopic elastic sleeve assembly in the present invention;

[0022] Figure 3 It is a structural schematic diagram of the lower inner cylinder in the figure of the present invention. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] See also Figure 1-3A steel inner tube chimney without flange-free flexible sealing connection comprises: an inner tube 1, an outer tube 2 sleeved on the outer periphery of the inner tube, the inner tube is formed by splicing a plurality of upper inner tubes 11 and lower inner tubes 12, the outer tube is formed by splicing a plurality of upper outer tubes 21 and lower outer tubes 22, in a specific embodiment, the upper outer tube and the lower outer tube can be connected by a flange, each of the upper inner tube and the lower inner tube is fixedly connected to the corresponding outer tube, the upper inner tube and the lower inner tube are connected by a retractable elastic sleeve assembly, the retractable elastic sleeve assembly consists of a spring assembly 3 and a movable tube section 4, the spring assembly includes 3-4 groups, and is evenly distributed along the circumferential direction of the upper inner tube, the spring assembly 3 includes A pull rod fixing part 31 welded to the outside of the upper inner cylinder, a pull rod 32 welded on the pull rod fixing part, and a pull rod guide part 33 welded to the outside of the movable cylinder section, a compression spring 34 is sleeved on the pull rod, and the lower end of the pull rod passes through the pull rod guide part and is fixed by using a locking nut 35, the movable cylinder section 4 includes a movable cylinder section straight section 41 sleeved on the outside of the upper inner cylinder and a movable cylinder section cone section 42 integrally formed at the lower end of the movable cylinder section straight section, the top end of the lower inner cylinder 12 has an inverted cone cylinder 121 that is completely matched with the movable cylinder section cone section 42, after the upper inner cylinder and the lower inner cylinder are installed, the movable cylinder section cone section is pressed tightly against the inner wall of the inverted cone cylinder under the action of the compression spring.

[0025] Specifically, the movable cylinder section and the lower end of the upper inner cylinder are inserted and assembled, and the general gap is 2~3mm. To avoid air leakage here, it is necessary to weld an air baffle 5 at the lower end of the inner cylinder. In the initial state, the lower part of the air baffle should cover the upper section of the movable cylinder section by about 20mm, and a gap of 2~3mm is reserved. The air baffle is divided into two halves, which are respectively welded to the side walls of the upper inner cylinder. The longitudinal dividing seam between the two halves of the air baffle does not need to be welded. After the installation of each section of the chimney is completed and when the smoke exhaust is running, the temperature expansion of the inner cylinder will prompt the movable cylinder section to move upward, and the movement will cause the upper section of the movable cylinder section to support the air baffle. In order to make the air baffle have a slight expansion, the air baffle adopts a two-half structure, and the longitudinal dividing seam is not welded.

[0026] In order to improve the sealing and prevent the smoke from escaping from the gap of the air baffle, a flexible sealing material, such as a ceramic fiber rope, is filled between the air baffle and the outer wall of the upper inner tube, generally with a diameter of 6~8mm.

[0027] Specifically, an air blocking ring 6 is welded on the inner side of the middle of the straight section of the movable cylinder segment, which prevents smoke from directly rushing into the gap between the movable cylinder segment and the inner cylinder wall, thereby further preventing the problem of smoke leakage.

[0028] Specifically, the cone section at the lower end of the movable cylinder section is completely consistent with the inverted cone tube at the top end of the lower inner tube. After the upper inner tube and the lower inner tube are installed, the cone section of the movable cylinder section will be tightly pressed against the inner wall of the inverted cone tube under the action of the compression spring to form a sealing conical surface with a width of about 100 mm. Preferably, during operation, sealant is applied to the surface of the cone section of the movable cylinder section to further enhance the air tightness of the inner tube connection.

[0029] Specifically, a sealing ring 7 needs to be welded on the outer side of the middle part of the straight section of the movable cylinder segment to further ensure the sealing effect. After the installation is completed, the conical section of the movable cylinder segment is tightly matched with the inverted conical cylinder wall, and the inverted conical cylinder at the top of the lower inner cylinder is tightly against the lower end surface of the sealing ring, forming another anti-leakage defense line on the outside.

[0030] In the present invention, the air-blocking ring inside the movable cylinder segment and the sealing ring outside the movable cylinder segment can also play a role in reinforcing and rounding the movable cylinder segment, thereby being more conducive to the coordinated movable relationship between the movable cylinder segment and the inner cylinder.

[0031] It should be noted that since the inner tube of each chimney section is fixed on the outer tube wall of this section, the weight of this section of the inner tube is borne by the outer tube wall. Therefore, for each section of the inner tube wall, the maximum axial pressure or tension is only the weight of this section, which has nothing to do with the overall chimney height. Since the upper and lower sections of each section of the inner tube are connected by the above-mentioned retractable elastic sleeve assembly, they are flexible and will not transmit bending moment.

[0032] Therefore, the design of the inner tube wall only needs to consider the corrosion allowance and the axial force generated by the weight of the section, and the general segmentation will not exceed 15m, so the axial force is very small, and the general minimum wall thickness is sufficient to resist it. Therefore, the same minimum wall thickness can be used for the entire inner tube of the chimney. For example, an inner tube with a diameter of 2.5m and a sleeve-type chimney with a total height of 80m can both have a wall thickness of 3mm (under conventional corrosion considerations). Under the prior art, the inner tube requires a wall thickness of at least 6~8mm to meet the strength requirements. Considering the need for corrosion resistance, the inner tube generally uses expensive materials such as stainless steel and titanium steel. The solution of the present invention can reduce the thickness of the inner tube wall, which can greatly reduce production costs.

[0033] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A steel inner tube chimney without flange flexible sealing connection, comprising: An inner cylinder, an outer cylinder sleeved on the outer periphery of the inner cylinder, characterized in that the inner cylinder is spliced ​​by a plurality of upper inner cylinders and lower inner cylinders, the outer cylinder is spliced ​​by a plurality of upper outer cylinders and lower outer cylinders, the upper inner cylinder and the lower inner cylinder are connected by a telescopic elastic sleeve assembly, the telescopic elastic sleeve assembly is composed of a spring assembly and a movable cylinder section, the spring assembly includes a pull rod fixing part arranged on the outer side of the upper inner cylinder, a pull rod welded on the pull rod fixing part, and a pull rod guide part arranged on the outer side of the movable cylinder section, a compression spring is sleeved on the pull rod, and the lower The end passes through the pull rod guide and then a locking nut is installed; the movable cylinder section includes a movable cylinder section straight section mounted on the outside of the upper inner cylinder and a movable cylinder section conical section located at the lower end of the movable cylinder section straight section, the top end of the lower inner cylinder has an inverted cone cylinder that fully matches the cone section of the movable cylinder section, after the upper inner cylinder and the lower inner cylinder are installed, the cone section of the movable cylinder section is pressed tightly against the inner wall of the inverted cone cylinder under the action of a compression spring, the upper outer cylinder and the lower outer cylinder are connected by a flange, and the inner cylinder of each chimney section is independently fixedly connected to the corresponding outer cylinder wall.

2. A steel inner tube chimney without flange-free flexible sealing connection according to claim 1, characterized in that: The movable cylinder section is sleeved on the outer side of the lower end of the upper inner cylinder, and the gap between the two is 2-3 mm.

3. A steel inner tube chimney without flange-free flexible sealing connection according to claim 2, characterized in that: An air shield is arranged at the middle position of the outer side of the upper inner cylinder.

4. A steel inner tube chimney without flange-free flexible sealing connection according to claim 3, characterized in that: The air shield is divided into two half structures, which are respectively welded to the side walls of the upper inner cylinder.

5. The steel inner tube chimney without flange-free flexible sealing connection according to claim 3, characterized in that: A flexible sealing material is filled between the air shield and the outer side wall of the upper inner cylinder.

6. The steel inner tube chimney without flange-free flexible sealing connection according to claim 1, characterized in that: An air-blocking ring is welded on the inner side of the middle part of the straight section of the movable cylinder section.

7. A steel inner tube chimney without flange-free flexible sealing connection according to claim 6, characterized in that: A sealing ring is welded on the outer side of the middle part of the straight section of the movable cylinder section. After the upper inner cylinder and the lower inner cylinder are installed, the inverted cone cylinder at the top end of the lower inner cylinder abuts against the lower end surface of the sealing ring.

8. The steel inner tube chimney without flange-free flexible sealing connection according to claim 1, characterized in that: The spring assembly includes 3-4 groups and is evenly distributed along the circumferential direction of the upper inner cylinder.

9. The steel inner tube chimney without flange-free flexible sealing connection according to claim 1, characterized in that: The movable cylinder segment cone section is integrally formed at the lower end of the movable cylinder segment straight section.

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