A rail stray current protection system based on composite insulation technology

Abstract

The present invention discloses a rail stray current protection system based on composite insulation technology. The structure of the rail waist guard block is optimized and designed, and an insulating material with high insulation is coated on its outer surface to improve its own insulation performance. Connecting shoulders are designed at both ends, so that when the sections are assembled, the longitudinal gaps between the sections can be sealed by using high-insulation elastic connecting pieces. The use of high-insulation elastic connecting pieces can achieve self-adaptation to the gap changes caused by the deformation of the rails and rail waist guard blocks. When the notch designed at the bottom of the rail waist guard block is connected and matched with the rail bottom sheath, the two can be squeezed against each other, thereby achieving the effect of self-sealing the gap between the two, and playing the role of water-blocking insulation. After the various components of the system are assembled, high-insulation paint is sprayed on the positions where physical gaps may exist in the entire system to achieve secondary insulation sealing, thereby further improving the insulation performance and long-term use effect of the entire system.

Description

Technical Field

[0001] The invention relates to the field of power supply and stray current prevention of track engineering, and in particular to a rail stray current prevention system based on composite insulation technology. Background Art

[0002] Modern trams are powered by DC750V, usually through overhead contact. The substation supplies power to the train through the overhead contact or conductive rails. The overhead contact, locomotive, and rails form a loop to allow the traction current to flow back to the traction substation. Since the rails and the ballast structure cannot be completely insulated, the traction current cannot flow back to the negative pole of the traction substation when it flows through the rails. Some of the traction current will leak onto the ballast structure and flow into the ground.

[0003] In subway projects, rails are usually only fixed to the ballast at the fasteners, where the rails are insulated by rubber pads and insulating gauge blocks in the fasteners. In other parts, the rails are suspended, and there is an air gap of no less than 70 mm between the remaining ballasts. This method enhances the overall transition resistance of the rail system to the ground and reduces the path and amount of stray current leakage. For the track structure of trams, especially buried tracks, the entire rail is inside the ballast plate, and there is no air gap between the rail and the ballast. Therefore, if special treatment measures are not taken, the insulation performance between the rail and the ballast will be greatly reduced, resulting in a large amount of current leakage to form stray currents, which will cause electrochemical corrosion to the track and other metal components in its surrounding environment, shortening their service life and possibly affecting the normal use of certain equipment.

[0004] In response to the above-mentioned problems, through research, this patent proposes a rail stray current protection system based on composite insulation technology, and obtains a tram stray current protection track wrapping system with simple structure, good overall sealing performance and excellent insulation performance. Summary of the invention

[0005] In view of the above-mentioned problems, the present invention aims to provide a rail stray current protection system based on composite insulation technology. By continuously wrapping the rail waist and rail bottom as a whole, the rail and fastener system and the ballast bed have high sealing and insulation performance, reducing the amount of stray current flowing into the earth, thereby protecting the rail and other metal materials around it.

[0006] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is as follows: a rail stray current protection system based on composite insulation technology, comprising a rail, an insulating protection device is longitudinally and continuously wrapped from the rail waist on one side of the rail to the rail waist on the other side, the insulating protection device is arranged at intervals along the length of the rail, and the connection between adjacent insulating protection devices has the function of maintaining insulation and sealing in a telescopic state according to the ambient temperature.

[0007] Preferably, the insulating protection device includes a rail waist sleeve tightly attached to the rail waist on both sides of the rail, and a rail bottom sleeve is wrapped on the bottom rail of the rail, and both side edges of the rail waist sleeve are sealed and pressed against the side walls of the rail through the bottom surface of the rail waist sleeve, and the respective connecting gaps of adjacent rail waist sleeves and adjacent rail bottom sleeves correspond to each other, and an elastic connecting piece is provided outside the corresponding connecting gap for simultaneously sealing and insulating the connecting gaps of the two and having the function of overcoming the temperature change of the connecting gap.

[0008] Preferably, shoulders are provided on both sides of the rail waist sleeve for cooperating with the adjacent rail waist sleeve to be installed in cooperation with the elastic connecting piece, and the depth of the shoulders is greater than the thickness of the elastic connecting piece.

[0009] Preferably, a notch is provided at the contact portion between the rail waist sleeve and the rail bottom sleeve for pressing the main body thereof against the rail bottom sleeve and the surface of the rail.

[0010] Preferably, the inner wall of the rail bottom jacket is provided with an insulating sealing layer which wraps and fits closely with the rail.

[0011] Preferably, both sides of the rail bottom sleeve are provided with fastener covers for pressing the rail bottom sleeve and the rail together onto the ballast bed.

[0012] Preferably, the rail waist protective sleeve is a rail waist protective block that supports the top and bottom of the rail and has an I-shaped structure.

[0013] Preferably, the rail waist protective sleeve is a rail waist protective groove that supports the top and bottom of the rail and has a C-shaped structure.

[0014] The beneficial effects of the present invention are:

[0015] 1. The wrapping system designed by this method can realize the self-adaptation to the change of the longitudinal gap of the rail waist guard block by utilizing the self-deformation of the elastic material. At the same time, the mutual extrusion deformation of the contacting elastic materials can realize the sealing barrier of fluids such as water and oil, making this system a strictly sealed system.

[0016] 2. The exposed surface of the rail waist guard block is sprayed in the factory, which reduces the workload of on-site construction. The factory spraying environment is easy to control and the spraying quality can be guaranteed.

[0017] 3. After the construction is completed, use spraying equipment to spray high-insulation paint into the gaps in the system to perform secondary sealing of the gap material.

[0018] 4. This patented method utilizes composite insulation technology and adopts various forms of insulating materials to wrap the rails, forming a seamless wrapping system, improving the insulation performance of the system, and enhancing the system's ability to prevent stray currents. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The figure is a diagram of the overall system for preventing stray current of a rail with a rail waist protection block according to the present invention.

[0020] Figure 2 It is a three-dimensional structural diagram of the rail waist guard blocks on both sides of the rail of the present invention.

[0021] Figure 3 For the present invention Figure 2 Connecting piece for rail waist guard block.

[0022] Figure 4 This is a structural diagram of the rail bottom sheath of the present invention.

[0023] Figure 5 This is a diagram showing the matching structure of the rail bottom sleeve and the rail waist sleeve of the present invention.

[0024] Figure 6 This is an overall system diagram for preventing stray current of a rail with a rail waist protection groove according to the present invention.

[0025] Figure 7 For the present invention Figure 6 Three-dimensional structural diagram of the rail waist guard groove on both sides of the rail.

[0026] Figure 8 For the present invention Figure 6 Connecting piece for rail waist groove protection. DETAILED DESCRIPTION

[0027] In order to enable those skilled in the art to better understand the technical solution of the present invention, the technical solution of the present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0028] See attached Figures 1 to 8A rail stray current protection system based on composite insulation technology is shown, comprising a rail 1, with an insulating protection device longitudinally and continuously wrapped from the waist of one side of the rail 1 to the waist of the other side. The insulating protection device has the function of insulating and isolating the bottom surface and the side waist of the rail 1 from the ballast bed in an overall continuous manner, and preventing the contact between the rail 1 and the ballast bed from the main body of the rail 1. It has a highly reliable insulating effect, can cover and prevent the conduction of stray currents and the ballast bed, and improve driving safety. In order to facilitate the insulation of longer rails 1, the insulating protection device is arranged at intervals along the length of the rail 1, and is installed throughout the longitudinal direction of the rail without interfering with the fastener system. Its length is determined according to the design requirements, and it can be wrapped and sealed and insulated along the length direction of the rail 1 according to actual operating needs.

[0029] Since the insulation protection device is wrapped in sections, in order to make the joints of the sectioned wrapping also have a reliable sealing and insulating effect, the joints of adjacent insulation protection devices have the function of maintaining insulation and sealing in a telescopic state with the ambient temperature. The surface of this function is to insulate and seal the joints of the insulation protection device, and its main function is to solve the problem of the change in the joint width of the insulation protection device and the rail 1 under the influence of temperature. The ability of the insulation protection device to resist the rupture caused by temperature changes is improved, so that the insulation protection device can reliably protect the insulation of the rail 1 under environmental conditions.

[0030] Specifically, the insulating protection device includes a waist sheath 2 that is tightly attached to the waist of the rails on both sides of the rail 1. Due to the special structure of the rail 1 (similar to an I-shaped structure), the waist sheath 2 is used to support and strengthen the overall strength of the rail 1 on the one hand, and to provide insulation protection for both sides of the rail 1 on the other hand. In order to improve the insulation performance of the waist sheath 2, preferably, a waterproof and insulating material coating is coated on its surface to avoid the deterioration of the insulation performance of the internal material due to long-term exposure to a humid environment, and to further enhance the surface insulation performance of the entire rail system. In order to make the waist and bottom of the rail 1 have a continuous wrapping insulation effect, a bottom sheath 3 is wrapped on the bottom rail of the rail 1, and both sides of the bottom sheath 3 are sealed and pressed against the side walls of the rail 1 through the bottom surface of the waist sheath 2, so that the waist sheath 2, while supporting the strength of the rail 1, forms a continuous wrapping insulation effect on the rail 1 with the bottom sheath 3.

[0031] In order to ensure continuous insulation along the length direction of the rail 1, the adjacent rail waist sheaths 2 and the adjacent rail bottom sheaths 3 have corresponding gaps, and an elastic connecting piece 4 is provided outside the corresponding gaps for sealing and insulating the gaps of the two and having the function of overcoming the change of the gaps with temperature. The gaps of the adjacent rail waist sheaths 2 and the gaps of the adjacent rail bottom sheaths 3 are insulated and sealed by the connecting piece 4, so as to maintain continuous insulation along the length direction of the rail 1. The elastic connecting piece 4 has the characteristics of thin size and easy changeability. When the rail 1, the rail waist sheath 2 and the rail bottom sheath 3 are affected by temperature, the changing joint gap can be effectively blocked, and the gap change caused by the deformation of the rail 1 and the rail waist sheath 2 can be adaptively adjusted, ensuring that the rail waist sheath 2 and the rail bottom sheath 3 have high tightness and insulation along the direction of the rail 1 as a whole, avoiding water immersion of the rail due to the longitudinal gap of the rail, and the increase of stray current caused by the reduction of the transition resistance of the rail to the ground, and other problems caused by this.

[0032] In order to facilitate the positioning and connection between the elastic connecting piece 4 and the rail waist sheath 2, shoulders 21 are provided on both sides of the rail waist sheath 2 for the elastic connecting piece 4 to be installed in cooperation with the adjacent rail waist sheath 2. During installation, the elastic connecting piece 4 is attached to the shoulder 21 of the adjacent rail waist sheath 2 and sealed by gluing with a high-insulation elastic material layer. In order to avoid the influence of the surface height of the rail waist sheath 2 on the installation of the fastener system, the depth of the shoulder 21 is greater than the thickness of the elastic connecting piece 4. In this way, the elastic connecting piece 4 will not exceed the surface height of the rail waist sheath 2 after bonding, and will not cause installation interference to the fastener system.

[0033] In order to improve the sealing and insulation performance of the rail waist sheath 2, the rail bottom sheath 3 and the rail 1, a notch 22 is provided at the contact portion between the rail waist sheath 2 and the rail bottom sheath 3 for pressing the body of the rail waist sheath 2 against the surface of the rail bottom sheath 3 and the rail 1. Since the rail bottom sheath 3 is wrapped around the rail 1 and has a certain thickness, the rail 1 forms a boss ( Figure 5 A), so the notch 22 contacts the boss, so that the rail waist jacket 2 can simultaneously seal and contact with the rail bottom jacket 3 and the surface of the rail 1. Preferably, the notch 22 and the boss are tightly matched, so that the rail waist jacket 2 and the rail bottom jacket 3 are squeezed against each other, thereby achieving the effect of self-sealing of the gap between the two, playing the role of water-blocking insulation, preventing external moisture from entering the packaging system along the bottom gap, forming a conductive path between the outside and the rail, thereby reducing the transition resistance of the rail to the ground.

[0034] In order to further improve the sealing insulation of the contact surface between the rail bottom sheath 3 and the rail 1, the inner wall of the rail bottom sheath 3 is provided with an insulating sealing layer 31 wrapped and fitted with the rail 1. Preferably, the insulating sealing layer 31 is made of elastic material, which can be tightly attached to the surface of the rail 1 through its own elastic contraction as the temperature of the rail 1 changes. Before the insulating sealing layer 31 contacts the bottom of the rail 1, the rail 1 needs to be rust-free, and then the insulating sealing layer 31 and the rail bottom sheath 3 are bonded to the rail 1 with an adhesive. Then, the rail waist sheath 2 is bonded to the rail waist, and the bottom is bonded and sealed with the rail bottom sheath 3.

[0035] In order to facilitate the installation of the rail fastener system, fastener covers 5 are provided on both sides of the rail bottom jacket 3 to press it and the rail 1 onto the ballast bed. Since the rail fastener system contains many components with different shapes, direct contact with the rail bottom jacket 3 is likely to wear the rail bottom jacket 3 under the action of long-term vibration. Therefore, after the fastener cover 5 is provided, the force of the railway fastener system is applied to the rail bottom jacket 3 and the rail 1 through the fastener cover 5, which can effectively avoid the direct wear of the rail bottom jacket 3 by the fastener system and enhance the insulation protection of the rail bottom jacket 3 to the rail 1. Preferably, the bottom surface of the fastener cover 5 is an inclined surface to match the rail 1, and its top surface is a plane to match the fastener system.

[0036] In order to enhance the support for the rail 1 on the basis of insulation protection, the rail waist sleeve 2 is a rail waist protection block 2a (preferably made of hard insulating rubber) with an I-shaped structure that supports the top and bottom of the rail 1, and includes a support portion 23 with a groove-shaped structure, and a connecting portion 24 provided at the top of the support portion 23 on one side of the rail waist of the rail 1. The support portion 23 is used to contact the top and bottom of the rail 1 to strengthen the support of the rail 1 body, and the connecting portion 24 is used to connect between adjacent rail waist protection blocks 2a (shoulders 21 are provided on both sides of the connecting portion). The side of the rail bottom sleeve 3 is sealed and pressed against the rail 1 by the bottom surface of the support portion 23. The main body of the rail waist sleeve 2 has the function of forming an elastic transition between the rail and the external material in the hardened section of the rail, reducing the impact of vibration and deformation of the rail 1 on the external material, reducing its damage, and also ensuring the integrity of the road surface.

[0037] Since the greening section does not have the problem of the hardening section, the rail waist sheath 2 is a rail waist protection groove 2b with a C-shaped structure that supports the top and bottom of the rail 1. It is closely attached to the rail waist to insulate and protect the rail 1.

[0038] After the assembly of all the components of the entire system is completed, high-insulation paint is sprayed on the positions where there may be physical gaps in the entire system to achieve secondary insulation sealing, further improving the insulation performance and long-term use effect of the entire system. The wrapping system completely wraps the rails. The system uses elastic materials with high insulation performance to cover and fill the physical gaps that originally existed between the components in the system, making the wrapping system a completely sealed unit, avoiding rail corrosion caused by water contacting the rails, and at the same time greatly enhancing the transition resistance of the rails to the ground, reducing the amount of stray current flowing into the earth, thereby protecting the rails and other metal materials around them. The insulation design of the exposed surface of the rail waist guard can ensure that it is completed in the factory at the same time as the rail waist guard is produced, which can not only save installation time at the construction site, but also realize the insulation layer spraying in a relatively better spraying environment, ensuring the quality of the insulation layer, thereby ensuring its insulation effect. The wrapping system solution provided by the comprehensive control method of the system has no essential difference to the original rail surface treatment solution, which is convenient for the implementation of on-site construction.

[0039] Since tram rails, especially buried rails, need to be equipped with rail bottom covers at the bottom of the rails between the fasteners to avoid direct contact with the outside world, in the method provided by this patent, in the structural design of the rail bottom cover, an elastic material layer with high insulation performance is added inside it, which increases the resistance between the current passing through the rails and the rail bottom cover 3 to the external environment. After the installation of each component, the contact gap in the system is sprayed with high insulation paint on its surface, so as to achieve the purpose of further sealing the gap, thereby eliminating all physical gaps between the components, which is conducive to providing the system with anti-stray current performance.

[0040] Through the above technical scheme, the wrapping system structure proposed by the rail stray current protection system has better sealing, water-proofing and insulation performance, and the entire system is preferably made of flexible materials, which can not only dissipate the vibration of the rail, but also realize the flexible transition between the rail and the road surface structure.

[0041] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A rail stray current protection system based on composite insulation technology, comprising a rail (1), an insulation protection device longitudinally and continuously wrapped from the rail waist of one side of the rail (1) to the rail waist of the other side thereof, the insulation protection devices being arranged at intervals along the length of the rail (1), and the junctions between adjacent insulation protection devices having the function of maintaining insulation sealing in a telescopic state according to the ambient temperature; The insulating protection device comprises a rail waist sheath (2) closely attached to the rail waists on both sides of the rail (1); a rail bottom sheath (3) is wrapped on the bottom rail of the rail (1); both sides of the rail waist sheath (2) are sealed and pressed against the side wall of the rail (1) through the bottom surface of the rail waist sheath (2); the adjacent rail waist sheaths (2) and adjacent rail bottom sheaths (3) have corresponding gaps with each other, and an elastic connecting piece (4) is provided outside the corresponding gaps for simultaneously sealing and insulating the gaps of the two and for overcoming the change of the gaps with temperature; Both sides of the rail waist sleeve (2) are provided with shoulders (21) for cooperating with the adjacent rail waist sleeve (2) and the elastic connecting piece (4) for installation, and the depth of the shoulders (21) is greater than the thickness of the elastic connecting piece (4); A notch (22) is provided at the contact portion between the rail waist sleeve (2) and the rail bottom sleeve (3) for pressing the body of the rail waist sleeve (2) against the surface of the rail bottom sleeve (3) and the rail (1); Both sides of the rail bottom cover (3) are provided with fastener covers (5) for pressing the rail bottom cover (3) and the rail (1) onto the ballast bed.

2. The rail stray current protection system based on composite insulation technology according to claim 1 is characterized by: The rail waist protective sleeve (2) is a rail waist protective groove (2b) that supports the top and bottom of the steel rail (1) and has a C-shaped structure.

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