Lightning arrester for air duct of circulating water cooling tower

Abstract

The invention discloses a lightning arrester for an air duct of a circulating water cooling tower. The lightning arrester comprises an L-shaped support, a lightning strip fixing piece, a vibration reduction piece, an elastic support and a lightning strip assembly. The L-shaped support comprises a first arm part and a second arm part which are perpendicular to each other, the longitudinal extension length of the first arm part is larger than the transverse extension length of the second arm part, the second arm part is fixedly connected with the air duct, and an elastic support is arranged between the second arm part and the air duct; one side, far away from the air duct, of the first arm part is fixedly connected with a vibration reduction part, the other end of the vibration reduction part is fixedly connected with a lightning strip fixing part, and the lightning strip fixing part is in a sleeve shape; the lightning protection belt assembly comprises lightning protection belts and conductive hinges, the lightning protection belts are connected with the lightning protection belt fixing pieces, and the segments of the lightning protection belts are connected through the conductive hinges. A triple vibration reduction structure is formed through the L-shaped support, the elastic support and the vibration reduction piece, vibration transmission generated during operation of the fan is effectively isolated, and the problem of metal fatigue fracture caused by traditional rigid connection is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of lightning protection equipment, and specifically to a lightning protection device for the chimney of a circulating water cooling tower. Background Art

[0002] Circulating cooling towers are crucial in industrial production. By cooling hot water and recycling it, they effectively improve the utilization rate of water resources and reduce production costs. The chimney, as a key component of the cooling tower, is located at the top of the cooling tower and is the core equipment for enhancing heat transfer efficiency.

[0003] In the existing lightning protection and grounding design at the top of the chimney of a circulating cooling tower, a lightning protection strip is usually adopted, which is fixed along the edge of the chimney through brackets, welded into a circle, and the lightning is introduced into the underground grounding grid through more than two groups of grounding down conductors.

[0004] However, it is found in actual operation that when the fan of the circulating cooling tower rotates, it will cause the chimney to vibrate, and then drive the lightning protection strip to vibrate. Since the lightning protection strip has a circular structure and welding is generally used to ensure its reliability, the lightning protection strip in the existing technology has no anti-vibration design. Long-term vibration is likely to cause fatigue of the welding points, resulting in resonance fractures at multiple places, and the durability cannot be guaranteed. This not only seriously affects the lightning protection effect, but also poses a huge safety risk to the circulating cooling tower when it is struck by lightning. Summary of the Invention

[0005] The purpose of the present invention is to overcome the above-mentioned deficiencies in the prior art, and provide a lightning protection device for the chimney of a circulating water cooling tower, which improves the stability and reliability of the lightning protection strip and ensures the safe operation of the circulating cooling tower.

[0006] The purpose of the present invention is achieved through the following technical solutions:

[0007] A lightning protection device for the chimney of a circulating water cooling tower includes an L-shaped bracket, an elastic bracket, a lightning protection strip fixing member, a damping member and a lightning protection strip assembly; the L-shaped bracket includes a first arm and a second arm perpendicular to each other, the longitudinal extension length of the first arm is greater than the transverse extension length of the second arm, the second arm is fixedly connected to the chimney, and an elastic bracket is provided between the second arm and the chimney;

[0008] One side of the first arm away from the chimney is fixedly connected to the damping member, the other end of the damping member is fixedly connected to the lightning protection strip fixing member, and the lightning protection strip fixing member is in the shape of a sleeve;

[0009] The lightning protection strip assembly includes a lightning protection strip and a conductive hinge. The lightning protection strip is connected to the lightning protection strip fixing member. The lightning protection strip consists of several short segments, and each segment of the lightning protection strip is connected by a conductive hinge.

[0010] Preferably, the lightning protection strip fixing member is made of Cu-Al-Ni shape memory alloy.

[0011] Preferably, the first arm portion is fixedly connected to the outer wall of the air duct by bolts.

[0012] Preferably, the lightning protection strip fixing member is provided with a fixing hole, the inside of the fixing hole has a thread, and a screw rod passes through the fixing hole and is fixedly connected to the lightning protection strip.

[0013] Preferably, the elastic support includes one of a rubber pad or a metal rubber composite pad.

[0014] Preferably, the thickness of the elastic support is 5-15 mm.

[0015] Preferably, the L-shaped support rod is made of a high-strength metal material.

[0016] Preferably, the L-shaped support rod is a stainless steel flat iron.

[0017] Preferably, the damping member is a spring.

[0018] Preferably, the conductive hinge includes a hinge ear plate and a hinge shaft. The hinge ear plate is welded to the end of the adjacent short section of the lightning protection strip. The hinge shaft passes through the ear plate and is locked by a silver-plated gasket.

[0019] The present invention has the following advantages and beneficial effects compared with the prior art:

[0020] (1). The present invention spatially isolates the lightning protection strip from the air duct through the L-shaped bracket, and an elastic support is arranged between the L-shaped bracket and the air duct, as well as a damping member between the lightning protection strip fixing member and the bracket, forming a triple damping structure, effectively isolating the vibration transmission generated during the operation of the fan, and avoiding the problem of metal fatigue fracture caused by traditional rigid connection.

[0021] (2). The present invention adopts a multi-section lightning protection strip design connected by conductive hinges. While ensuring the electrical continuity between sections, it allows each section to move independently, not only ensuring a low-impedance discharge channel for lightning current, but also avoiding the risk of overall resonance, effectively improving the stability of the lightning protection strip, reducing the possibility of resonance fracture of the lightning protection strip caused by the vibration of the air duct, ensuring the reliability of the lightning protection strip during long-term operation, and providing reliable lightning protection for the circulating water cooling tower.

[0022] (3). The lightning protection strip fixing member uses Cu-Al-Ni shape memory alloy, which is flexible at room temperature (allowing vibration displacement), and the current heating during lightning strikes triggers the hardening of the SMA to lock the lightning protection strip. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a schematic structural diagram of the present invention;

[0024] Figure 2 is a schematic structural view of the lightning protection strip assembly of the present invention;

[0025] Figure 3 is a schematic structural view of the L-shaped bracket of the present invention;

[0026] Markings of each component in the drawings:

[0027] 1 - L-shaped bracket, 2 - elastic bracket, 3 - lightning protection strip fixing piece, 4 - shock absorber, 5 - lightning protection strip, 6 - conductive hinge, 7 - first arm, 8 - second arm, 9 - lightning protection strip assembly; Specific embodiments

[0028] The invention object of the present invention will be further described in detail below with reference to the drawings and specific embodiments. The embodiments cannot be described in detail one by one here, but the embodiments of the present invention are not limited to the following embodiments.

[0029] Embodiment 1

[0030] A lightning protection device for a circulating water cooling tower chimney includes an L-shaped bracket 1, an elastic bracket 2, a lightning protection strip fixing piece 3, a shock absorber 4, and a lightning protection strip assembly 9. The L-shaped bracket 1 includes a first arm 7 and a second arm 8. The lightning protection strip assembly 9 includes a lightning protection strip 5 and a conductive hinge 6;

[0031] The lateral extension length of the second arm 8 is greater than the diameter of the chimney. An elastic bracket 2 is provided on the upper surface of the second arm 8. The elastic bracket 2 is a 10-mm rubber pad. A chimney is provided on the rubber pad. The second arm 8 is fixedly connected to the chimney by bolts. A rubber pad is provided between the second arm 8 and the chimney, so that the present invention forms a first layer of protection for the lightning protection strip 5;

[0032] The first arm 7 and the second arm 8 are perpendicular to each other and are both made of stainless steel flat iron. The longitudinal extension length of the first arm 7 is greater than the transverse extension length of the second arm 8, and the ratio of their lengths is 10:8. The upper end of the side of the first arm 7 away from the air duct is fixedly connected to the spring shock absorber 4, and the other end of the spring shock absorber 4 is connected to the lightning protection belt fixing member 3. The lightning protection belt fixing member 3 is in the shape of a sleeve and is made of Cu-Al-Ni shape memory alloy. The lightning protection belt assembly 9 is laid on the surface of the lightning protection belt fixing member 3. The lightning protection belt fixing member 3 is provided with threaded fixing holes, and the lightning protection belt 5 is connected to the lightning protection belt fixing member 3 by passing bolts through the threaded fixing holes opened in the lightning protection belt fixing member 3. Through the setting of the L-shaped bracket 1, the lightning protection belt 5 is spatially isolated from the air duct to form a second-level shock absorption protection. A spring shock absorber 4 is arranged between the second arm 8 and the lightning protection belt fixing member 3 to form a third-level shock absorption protection. The Cu-Al-Ni shape memory alloy remains flexible at normal temperature (low temperature) to absorb vibration. When struck by lightning, the current Joule heat triggers the alloy to heat up to the austenite phase, and the lightning protection belt fixing member 3 hardens and locks the lightning protection belt 5 to ensure low-resistance conduction.

[0033] The lightning protection belt 5 consists of several short segments, and the segments of each lightning protection belt 5 are connected by a conductive hinge 6. The conductive hinge 6 includes a hinged ear plate and a hinged shaft. The hinged ear plate is welded to the ends of adjacent short segments of the lightning protection belt 5. The hinged shaft passes through the ear plate and is locked by a silver-plated gasket. The multi-segment lightning protection belt 5 design allows each segment to move independently while ensuring the electrical continuity between segments, which not only ensures a low-impedance discharge path for lightning current but also avoids the risk of overall resonance.

[0034] The installation method is as follows: Remove the old brackets of the circulating water air duct and the broken old lightning protection belt, and install the L-shaped bracket 1 using the original bracket fixing holes of the air duct to ensure that the bracket is firmly fixed on the outer wall of the air duct. After the L-shaped bracket 1 is installed, pass the lightning protection belt 5 along the edge of the air duct through the sleeves above the brackets in sequence, ensuring that the lightning protection belt 5 is laid flat and straight without twisting or deformation. Use the threaded fixing holes on the sleeves to tighten the screw rods and ensure the tightness between the lightning protection belt 5 and the sleeves. The lap joints of the lightning protection belt 5 are processed and treated according to relevant specification requirements to ensure good electrical connection performance of the lightning protection belt 5. The connection between the lightning protection belt 5 and the grounding downlead should be firm and reliable, using welding or other compliant connection methods to ensure that lightning can pass through the lightning protection belt 5 and the grounding downlead smoothly.

[0035] After the L-shaped bracket 1 and the lightning protection belt 5 are installed, it is necessary to check whether the brackets are installed firmly. Use professional testing instruments to measure the grounding resistance to ensure that all indicators meet the design requirements and relevant standard specifications. Ensure that the lightning protection belt 5 of the circulating water cooling tower air duct can operate normally and provide effective lightning protection for the circulating water cooling tower.

Claims

1. A lightning protection device for the air duct of a circulating water cooling tower, characterized in that It includes an L-shaped bracket (1), an elastic bracket (2), a lightning protection belt fixing member (3), a shock absorber (4) and a lightning protection belt assembly (9); the L-shaped bracket (1) includes a first arm portion (7) and a second arm portion (8) that are perpendicular to each other, the longitudinal extension length of the first arm portion (7) is greater than the transverse extension length of the second arm portion (8), the second arm portion (8) is fixedly connected to the air duct, and the elastic bracket (2) is provided between the second arm portion (8) and the air duct; One side of the first arm portion (7) away from the air duct is fixedly connected to the shock absorber (4), the other end of the shock absorber (4) is fixedly connected to the lightning protection belt fixing member (3), and the lightning protection belt fixing member (3) is in the shape of a sleeve; The lightning protection belt assembly (9) includes a lightning protection belt (5) and a conductive hinge (6), the lightning protection belt (5) is connected to the lightning protection belt fixing member (3), the lightning protection belt (5) is composed of several short segments, and each segment of the lightning protection belt (5) is connected by a conductive hinge (6).

2. The lightning protection device for the air duct of a circulating water cooling tower according to claim 1, wherein The lightning protection belt fixing member (3) is made of Cu-Al-Ni shape memory alloy.

3. The lightning protection device for the air duct of a circulating water cooling tower according to claim 1, characterized in that The first arm portion (7) is fixedly connected to the outer wall of the air duct by bolts.

4. The lightning protection device for the air duct of the circulating water cooling tower according to claim 1, characterized in that, The lightning protection belt fixing member (3) is provided with a fixing hole, the inside of the fixing hole has threads, and a screw passes through the fixing hole and is fixedly connected to the lightning protection belt (5).

5. The lightning protection device for the air duct of the circulating water cooling tower according to claim 1, characterized in that, The elastic bracket (2) includes one of a rubber pad or a metal rubber composite pad.

6. The lightning protection device for the air duct of the circulating water cooling tower according to claim 5, characterized in that, The thickness of the elastic bracket (2) is 5-15 mm.

7. The lightning protection device for the wind duct of a circulating water cooling tower according to claim 1 is characterized in that: The L-shaped support rod is made of a high-strength metal material.

8. The lightning protection device for the air duct of a circulating water cooling tower according to claim 6, characterized in that, The L-shaped support rod is a stainless steel flat iron.

9. The lightning protection device for the air duct of a circulating water cooling tower according to claim 1, characterized in that, The shock absorber (4) is a spring.

10. The lightning protection device for the air duct of the circulating water cooling tower according to claim 1, characterized in that, The conductive hinge (6) includes a hinge ear plate and a hinge shaft, the hinge ear plate is welded to the end of the adjacent short segment of the lightning protection belt (5), and the hinge shaft passes through the ear plate and is locked by a silver-plated gasket.

Images