Vibration reduction type free sliding sleeve chimney

Abstract

The vibration reduction type free sliding sleeve chimney comprises a chimney body, the chimney body comprises an outer barrel and an inner barrel, a group seat is arranged at the bottom of the outer barrel, the inner barrel is connected with a plurality of waste gas connectors communicated with the outside, the outer barrel is provided with a detection opening, and a spiral plate type air breaking ring is arranged on the upper portion of the outer barrel. And a damping device is arranged between the outer cylinder and the inner cylinder. The technical scheme has the beneficial effects that the wind power resonance problem in coastal areas can be basically eliminated, the maintenance operation is convenient, and the overall manufacturing cost is low.

Description

Technical Field

[0001] The invention belongs to the technical field of chimney design and manufacturing, and in particular relates to a vibration-damping free-sliding sleeve chimney. Background Art

[0002] When high-temperature corrosive flue gas is discharged, the heat resistance and corrosion resistance of the chimney must be considered due to its high temperature and corrosiveness. Stainless steel is an ideal manufacturing material, but the cost of stainless steel is high, so the sleeve structure is often used as the main form of the chimney, with carbon steel as the outer tube of the chimney structure layer and stainless steel as the exhaust inner tube.

[0003] In coastal areas, typhoons are frequent and the basic wind pressure design value is large. The damping ratio of steel chimney structures is usually only 0.01 to 0.02. Compared with reinforced concrete chimneys, they have the characteristics of small damping and light weight. Therefore, the self-vibration frequency of steel structure self-supporting chimneys is higher. According to the chimney design specifications, the wind speed at the top of the chimney is proportional to the basic wind pressure. The basic wind pressure in coastal areas is large, which leads to the wind speed at the top of the chimney being greater than the critical wind speed at the top of the chimney. The top wind speed is large, and the Reynolds number of the chimney is also high. When calculating the resonance response, first-order or second-order resonance problems often occur. The existing solution is to add a single pendulum frequency-modulated mass damper to the top of the chimney. This solution can solve the resonance problem, but the frequency-modulated mass damper relies on the mass block to swing in the opposite direction to offset the vibration. The added damper will increase the weight of the chimney, put higher pressure on the concrete at the bottom of the chimney, and the bottom bolts are subjected to greater horizontal shear force. At the same time, the damper also requires on-site debugging by professional technicians, and has high requirements for installation precision and accuracy. The cost of the damper is also high, which invisibly increases the labor cost and cost. Summary of the invention

[0004] In view of this, an object of the present invention is to provide a vibration-damping free-sliding sleeve chimney to solve the deficiencies in the prior art.

[0005] In order to achieve the above object, the present invention is achieved through the following technical solutions:

[0006] A vibration-damping free-sliding sleeve chimney is provided, which includes a chimney body, the chimney body includes an outer tube and an inner tube, a group seat is provided at the bottom of the outer tube, the inner tube is connected to a plurality of exhaust gas interfaces communicating with the outside, the outer tube has a detection port, a spiral plate-type wind-breaking ring is provided at the upper part of the outer tube, and a vibration-damping device is provided between the outer tube and the inner tube.

[0007] As described in the vibration-damping free-sliding sleeve chimney, wherein the outer cylinder comprises an outer cylinder upper section and an outer cylinder lower section connected by an outer flange, the inner cylinder comprises an inner cylinder upper section and an inner cylinder lower section connected by an inner flange, a catenary is connected between the outer wall of the inner cylinder upper section and the inner wall of the outer cylinder upper section, and the vibration-damping device is located between the outer cylinder upper section and the inner cylinder upper section.

[0008] As described in the shock-absorbing free-sliding sleeve chimney, wherein the shock-absorbing device includes an elastic connection assembly and a shock-absorbing wheel assembly, the shock-absorbing wheel assembly includes a shock-absorbing wheel, one end of the elastic connection assembly is fixed to the outer wall of the inner cylinder, and the other end is connected to the shock-absorbing wheel assembly. The shock-absorbing wheel abuts against the inner wall of the outer cylinder under the elastic force of the elastic connection assembly.

[0009] As described in the shock-absorbing free-sliding sleeve chimney, wherein the elastic connection assembly includes a connection seat, a shock-absorbing base, a guide rod, a spring and an adjusting bolt. The connection seat is fixed to the outer wall of the inner cylinder. The shock-absorbing base is a sleeve structure fixedly connected to the connection seat. One end of the guide rod is provided with a threaded hole, and the other end is fixedly connected to the shock-absorbing wheel assembly. The end of the guide rod with the threaded hole is inserted into one end of the spring, and the other end of the spring is placed in the sleeve opening of the shock-absorbing base. A first through hole is opened on one side of the connection seat facing the inner wall of the outer cylinder, and a second through hole is opened on one side of the shock-absorbing base facing the outer wall of the inner cylinder. The adjusting bolt sequentially passes through the first through hole, the second through hole and then enters the spring and is threadedly connected to the threaded hole of the guide rod.

[0010] As described in the shock-absorbing free-sliding sleeve chimney, wherein the shock-absorbing wheel assembly further includes a bearing and a shock-absorbing wheel base. The shock-absorbing wheel is sleeved on the bearing, and the bearing is fixedly connected to the shock-absorbing wheel base.

[0011] As described in the shock-absorbing free-sliding sleeve chimney, wherein the outer wall of the inner cylinder is provided with an inner cylinder reinforcing ring, and the bottom of the inner cylinder is provided with an inner cylinder support structure.

[0012] As described in the shock-absorbing free-sliding sleeve chimney, wherein an operating platform is provided near the inspection port of the outer cylinder, and a spiral staircase is connected to the bottom of the operating platform.

[0013] As described in the shock-absorbing free-sliding sleeve chimney, wherein a lightning protection device is provided at the top of the outer cylinder, and a rain shielding device is provided at the top of the inner cylinder.

[0014] As described in the shock-absorbing free-sliding sleeve chimney, wherein a maintenance manhole is provided at the bottom of the outer cylinder.

[0015] The beneficial effects of the technical solution of the present invention are:

[0016] It can basically eliminate the wind resonance problem in coastal areas, facilitate inspection, maintenance and operation, and the overall construction cost is low. Description of the Drawings

[0017] To further illustrate the above objects, structural features and effects of the present invention, the present invention will be described in detail below with reference to the drawings.

[0018] Figure 1Schematic diagram of the three-dimensional structure of the preferred embodiment of the present invention;

[0019] Figure 2 Longitudinal sectional view of the preferred embodiment of the present invention;

[0020] Figure 3 is Figure 2 Partial enlarged view of area A in

[0021] Figure 4 Schematic diagram of the structure of the shock absorption device of the preferred embodiment of the present invention;

[0022] In the figure: 1, outer cylinder; 2, inner cylinder; 3, skirt; 4, exhaust gas interface; 5, detection port; 6, spiral plate wind-breaking ring; 7, shock absorption device; 8, outer flange; 9, inner flange; 10, suspension chain; 11, shock absorption wheel; 12, connecting seat; 13, shock absorption base; 14, guide rod; 15, spring; 16, adjusting bolt; 17, bearing; 18, shock absorption wheel base; 19, inner cylinder strengthening ring; 20, inner cylinder support structure; 21, operation platform; 22, spiral ladder; 23, lightning protection device; 24, rain shelter device; 25, maintenance manhole; 26, upper hanging ear at the lower end. Detailed implementation manners

[0023] The terms "invention" and "the present invention" as used in this specification are intended broadly to refer to all subject matter of this specification and any of the following patent claims. Statements containing these terms should not be construed as limiting the subject matter described herein or the meaning or scope of any of the following patent claims. In addition, this specification does not attempt to describe or limit the subject matter covered by any specific component, paragraph, statement, or claim of this application. The subject matter should be understood with reference to the entire specification, all the drawings, and any of the following claims. The present invention may have other embodiments and may be practiced or implemented in other ways. Moreover, it should be understood that the language and terms used herein are for illustrative purposes and should not be considered limiting.

[0024] Details of the present invention will now be discussed with reference to the drawings of the present invention, which are provided by way of example only. In the drawings, like features or components may be labeled with the same reference numerals.

[0025] The use of the terms "comprising", "having", and "including" and their variants herein means including the items listed hereinafter, their equivalents, and additional items. Although directions such as above, below, upward, downward, backward, bottom, top, front, back, etc. may be referred to in the description of the drawings, for convenience, reference is made to the drawings. These directions are not intended to be literally accepted or limiting of the present invention in any form. In addition, terms such as "first", "second", "third", etc. are used herein for illustrative purposes and are not intended to indicate or imply importance or significance.

[0026] Refer toFigures 1 to 3 As shown in the figure, the shock-absorbing free-sliding sleeve chimney of the present invention includes a chimney main body, which includes an outer cylinder 1 and an inner cylinder 2. A skirt 3 is provided at the bottom of the outer cylinder 1 for connecting and fixing the chimney to the embedded bolts. The inner cylinder 2 is connected with a number of exhaust gas interfaces 4 communicating with the outside. The exhaust gas interfaces 4 introduce high-temperature corrosive gases into the inner cylinder 2 and discharge them to the atmosphere. The outer cylinder 1 has a detection port 5. A spiral plate wind-breaking ring 6 is provided at the upper part of the outer cylinder 1. The working principle of the wind-breaking ring is to change the surface state of the chimney. When high-speed wind blows through the wind-breaking ring, irregular air flow disturbances are formed, thereby weakening or eliminating the conditions for vortex shedding. The wind-breaking ring can partially reduce the resonance generated by strong coastal winds or typhoon airflows on the chimney, but cannot completely eliminate the resonance problem. A shock-absorbing device 7 is provided between the outer cylinder 1 and the inner cylinder 2.

[0027] The outer cylinder 1 includes an upper outer cylinder section and a lower outer cylinder section connected by an outer flange 8. The inner cylinder includes an upper inner cylinder section and a lower inner cylinder section connected by an inner flange 9. A catenary 10 is connected between the outer wall of the upper inner cylinder section and the inner wall of the upper outer cylinder section. The shock-absorbing device 7 is located between the upper outer cylinder section and the upper inner cylinder section.

[0028] Connection points are respectively provided on the outer cylinder 1 and the inner cylinder 2, and the catenary 10 is respectively connected to the connection points. This design solves the problems of large hoisting workload and difficult assembly when hoisting the inner and outer cylinders separately on site. When the lower outer cylinder section is hoisted and positioned, the upper outer cylinder section is hoisted. At this time, due to the connection of the catenary 10, the upper inner cylinder section and the upper outer cylinder section are hoisted simultaneously. When the upper part of the chimney is slowly lowered, due to the self-weight of the inner cylinder 2, the catenary 10 is straightened, and the inner cylinder 2 will descend a certain distance. The inner flange 9 is lower than the outer flange 8. At this time, use tools to lock the fasteners of the inner flange 9 first, and continue to lower the outer cylinder 1 until the upper and lower end flanges of the outer cylinder 1 are in contact, and then use tools to lock the outer flange 8 to conveniently complete the assembly.

[0029] Since the wind-breaking ring cannot completely eliminate the wind resonance problem in coastal areas, in this design, without additionally increasing dampers, a shock-absorbing device 7 is designed between the inner and outer cylinders of the chimney.

[0030] Refer to Figure 4 As shown in the figure, the shock-absorbing device 7 includes an elastic connection component and a shock-absorbing wheel component. The shock-absorbing wheel component includes a shock-absorbing wheel 11. The shock-absorbing wheel 11 is a heat-resistant rubber wheel. One end of the elastic connection component is fixed to the outer wall of the inner cylinder, and the other end is connected to the shock-absorbing wheel component. The shock-absorbing wheel 11 abuts against the inner wall of the outer cylinder under the elastic force of the elastic connection component.

[0031] Further, the elastic connection component includes a connection seat 12, a damping base 13, a guide rod 14, a spring 15, and an adjustment bolt 16. The connection seat 12 is fixed to the outer wall of the inner cylinder. The damping base 13 is a sleeve structure fixedly connected to the connection seat 12. One end of the guide rod 14 is provided with a threaded hole, and the other end is fixedly connected to the damping wheel assembly. The end of the guide rod 14 with the threaded hole is inserted into one end of the spring 15, and the other end of the spring 15 is placed inside the opening of the sleeve of the damping base 13. A first through hole is opened on one side of the connection seat 12 facing the inner wall of the outer cylinder, and a second through hole is opened on one side of the damping base 13 facing the outer wall of the inner cylinder. The adjustment bolt 16 sequentially passes through the first through hole and the second through hole and then enters the spring 15 and is threadedly connected to the threaded hole of the guide rod 14.

[0032] Continuing to refer to the figure, the damping wheel assembly further includes a bearing 17 and a damping wheel base 18. The damping wheel 11 is sleeved on the bearing 17, and the bearing 17 is fixedly connected to the damping wheel base 18.

[0033] When the inner cylinder 2 discharges smoke, the high temperature will make the temperature of the inner cylinder 2 higher than that of the outer cylinder 1. After the inner cylinder 2 generates thermal expansion, it elongates upward. At this time, there is a displacement difference between the inner and outer cylinders. If a fixed connection is used, restricting the displacement of the inner cylinder 2 will generate a large thermal stress at the connection between the inner and outer cylinders, and weld bead tearing failure will occur after long-term use. After the damping device 7 is provided, the upward movement of the inner cylinder 2 drives the damping wheel 11 to roll inside the outer cylinder 1. The bearing 17 changes the sliding friction between the shaft of the damping wheel 11 and the damping wheel base 18 into rolling friction, greatly reducing the resistance when the inner and outer cylinders are displaced. Regardless of how the temperature of the inner cylinder changes, the inner and outer cylinders can move up and down freely.

[0034] When the chimney is blown by strong winds, the outer cylinder 1 will swing. At this time, the swing of the outer cylinder 1 is transmitted to the spring 15 through the shock-absorbing wheel base 18, and then the swing is transmitted to the shock-absorbing base 13 and the connecting seat 12 by the spring 15 respectively. Finally, the swing will be transmitted to the inner cylinder 2. Since the inner cylinder 2 itself has mass, the inner cylinder 2 also has inertia. When the spring 15 transmits displacement, the movement of the inner cylinder 2 has hysteresis, and most of the displacement of the outer cylinder 1 is converted into the compression deformation of the spring 15. When the outer cylinder 1 vibrates in the opposite direction, the displacement of the outer cylinder 1 is converted into the compression deformation of the spring 15 on the other side. The compression of the spring 15 will apply a reverse acting force to the outer cylinder 1 at the same time, and this acting force will reduce the amplitude of the outer cylinder 1. In this design, the fixing device between the outer cylinder 1 and the inner cylinder 2 is innovatively changed to a shock-absorbing device 7, so that the inner cylinder 2 and the shock-absorbing device 7 form a system similar to a mass damper, and at the same time solve the problem of stress concentration caused by inconsistent thermal expansion. According to the basic wind pressure and extreme wind speed in coastal areas, the swing amount of the chimney in the free state can be calculated, and a suitable spring 15 can be selected according to the swing amount. At this time, only by adjusting the adjusting bolt 16, the shock-absorbing effect of the shock-absorbing device 7 can be adjusted. This design solves the problems of high cost and high installation and debugging requirements of the existing design. The shock-absorbing device 7 is made of materials with simple structure and low unit price. This design can complete the assembly and debugging in the manufacturing factory, reducing the cost and greatly reducing the difficulty of on-site installation and debugging.

[0035] An inner cylinder reinforcing ring 19 is provided on the outer wall of the inner cylinder 2, and an inner cylinder support structure 20 is provided at the bottom of the inner cylinder 2. To reduce the overall cost of the chimney, it is necessary to reduce the amount of stainless steel used in the inner cylinder of the chimney. Therefore, an inner cylinder reinforcing ring 19 is provided on the inner cylinder 2. After adding the reinforcing ring, the stiffness of the inner cylinder increases, which can avoid the occurrence of negative pressure instability of the inner cylinder of the chimney, and at the same time can reduce the deformation of the inner cylinder 2, and the wall thickness of the inner cylinder 2 can be further reduced, thereby reducing the cost of the chimney.

[0036] An operating platform 21 is provided near the inspection port 5 of the outer cylinder 1, and a spiral ladder 22 is connected to the bottom of the operating platform 21, which is convenient for personnel to enter and exit and for inspection, repair and maintenance operations.

[0037] A lightning protection device 23 is provided at the top of the outer cylinder 1, and a rain shelter device 24 is provided at the top of the inner cylinder 2.

[0038] An inspection manhole 25 is provided at the bottom of the outer cylinder 1, which is convenient for personnel to enter the inside of the outer cylinder 1 to install the embedded bolts in the inner ring of the skirt support 3, and at the same time is convenient for observing the upper inner cylinder support structure 20. A lower lifting lug 26 is welded on the outer cylinder 1 for hoisting the chimney.

[0039] The above are only preferred embodiments of the present invention, and do not limit the implementation manners and protection scope of the present invention. For those skilled in the art, it should be able to realize that all equivalent replacements and obvious changes made by using the description and illustration content of the present invention should be included in the protection scope of the present invention.

Claims

1. A shock-absorbing free-sliding sleeve chimney, characterized in that It includes a chimney body, the chimney body includes an outer cylinder and an inner cylinder, a skirt is provided at the bottom of the outer cylinder, a number of exhaust gas interfaces communicating with the outside are connected to the inner cylinder, a detection port is provided on the outer cylinder, a spiral plate wind-breaking ring is provided at the upper part of the outer cylinder, and a vibration damping device is provided between the outer cylinder and the inner cylinder.

2. The shock-absorbing free-sliding sleeve chimney according to claim 1, characterized in that, The outer cylinder includes an upper outer cylinder section and a lower outer cylinder section connected by an outer flange, the inner cylinder includes an upper inner cylinder section and a lower inner cylinder section connected by an inner flange, a catenary is connected between the outer wall of the upper inner cylinder section and the inner wall of the upper outer cylinder section, and the vibration damping device is located between the upper outer cylinder section and the upper inner cylinder section.

3. The shock-absorbing freely sliding sleeve chimney according to claim 2, characterized in that, The vibration damping device includes an elastic connection assembly and a vibration damping wheel assembly, the vibration damping wheel assembly includes a vibration damping wheel, one end of the elastic connection assembly is fixed to the outer wall of the inner cylinder, and the other end is connected to the vibration damping wheel assembly, and the vibration damping wheel abuts against the inner wall of the outer cylinder under the elastic force of the elastic connection assembly.

4. The shock-absorbing free-sliding sleeve chimney according to claim 3, wherein, The elastic connection assembly includes a connection seat, a vibration damping base, a guide rod, a spring and an adjustment bolt, the connection seat is fixed to the outer wall of the inner cylinder, the vibration damping base is a sleeve structure fixedly connecting the connection seat, one end of the guide rod is provided with a threaded hole, and the other end is fixedly connected to the vibration damping wheel assembly. The end of the guide rod with the threaded hole is inserted into one end of the spring, and the other end of the spring is placed in the sleeve opening of the vibration damping base. A first through hole is provided on the side of the connection seat facing the inner wall of the outer cylinder, and a second through hole is provided on the side of the vibration damping base facing the outer wall of the inner cylinder. The adjustment bolt sequentially passes through the first through hole, the second through hole and then enters the spring and is threadedly connected to the threaded hole of the guide rod.

5. The shock-absorbing free-sliding sleeve chimney according to claim 3 or 4, characterized in that The vibration damping wheel assembly further includes a bearing and a vibration damping wheel base, the vibration damping wheel is sleeved on the bearing, and the bearing is fixedly connected to the vibration damping wheel base.

6. The shock-absorbing free-sliding sleeve chimney according to claim 1, wherein, An inner cylinder reinforcing ring is provided on the outer wall of the inner cylinder, and an inner cylinder support structure is provided at the bottom of the inner cylinder.

7. The shock-absorbing free-sliding sleeve chimney according to claim 1, characterized in that, An operation platform is provided near the detection port of the outer cylinder, and a spiral staircase is connected to the bottom of the operation platform.

8. The shock-absorbing free-sliding sleeve chimney according to claim 1, wherein A lightning protection device is provided at the top of the outer cylinder, and a rain shielding device is provided at the top of the inner cylinder.

9. The shock-absorbing free-sliding sleeve chimney according to claim 1, wherein, An inspection manhole is provided at the bottom of the outer cylinder.

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