Railway signal light source

Abstract

The utility model discloses a railway signal light source, it includes conducting base, mounting panel, power supply adaptation unit and LED load unit, and conducting base is the lamp holder part of railway signal machine original halogen tungsten lamp, and the lamp holder part retains its external fixed structure and electrical interface, and mounting panel is fixed on conducting base through fastener, and LED load unit and power supply adaptation unit all set up on mounting panel, and the input of power supply adaptation unit is electrically connected with the electrical interface of conducting base, and the output is electrically connected with LED load unit, and power supply adaptation unit includes alternating current -direct current conversion module, rectifier module, filter module and current -limiting module that connect in proper order, and the input of alternating current -direct current conversion module constitutes the input of power supply adaptation unit, and the output of current -limiting module constitutes the output of power supply adaptation unit, the utility model has solved the problem that the existing halogen tungsten type railway signal machine bulb is easy to burn, and the service life is short, and the problem of high failure frequency.

Description

Technical Field

[0001] This utility model relates to the field of railway travel technology, and in particular to a railway signal light source. Background Technology

[0002] Railway signals have a wide range of applications in railway stations. The on / off state of the signal bulbs and different display combinations can convey various train operation instructions to the train driver. By displaying different colored light signals, they can also ensure the safety of station operations and improve transportation efficiency. At the same time, railway signals are also an important component of the railway automation and information interlocking system. They form a linkage mechanism with track circuit equipment, turnout equipment, etc., and are interlocked to ensure that railway equipment works together in accordance with predetermined rules, providing safety guarantees for the automated operation of the railway. Therefore, they occupy an important position in the entire railway transportation system.

[0003] However, railway signal bulbs have a high failure rate during daily use, with bulb burnout accounting for as much as 95% of failures. The widely used halogen tungsten railway signal bulbs consist of a filament, bulb housing, bulb head, and filling gas. The filament is made of tungsten, and the bulb contains halogen elements such as iodine and bromine. When the filament operates at high temperatures, tungsten atoms sublimate and react with the halogen elements to form tungsten halide. The gaseous tungsten atoms adhere to the glass wall. As sublimation continues, the filament diameter gradually decreases, the heating power increases, and filament aging accelerates. Simultaneously, frequent train traffic in railway stations causes mechanical vibration and impact on the bulb. These two factors combined make the tungsten filament prone to burnout, leading to signal malfunctions. Furthermore, the lifespan of halogen tungsten railway signal bulbs is typically only 1000–2000 hours. In scenarios with continuous 24-hour operation, their actual usage time is even shorter, further exacerbating the frequency of failures. Utility Model Content

[0004] The purpose of this invention is to provide a light source for railway signal lights that can solve the problems of easy burnout, short service life, and high failure frequency of existing halogen tungsten railway signal light bulbs due to filament sublimation aging and mechanical vibration and impact.

[0005] To solve the above problems, the technical solution adopted by this utility model is as follows: This railway signal light source includes a conductive base, a mounting plate, a power adapter unit, and an LED load unit. The conductive base is the lamp head part of the original halogen tungsten lamp of the railway signal, and the lamp head part retains its external fixing structure and electrical interface. The mounting plate is fixed to the conductive base by fasteners. The LED load unit and the power adapter unit are both disposed on the mounting plate. The input end of the power adapter unit is electrically connected to the electrical interface of the conductive base, and the output end is electrically connected to the LED load unit. The power adapter unit includes an AC / DC conversion module, a rectifier module, a filter module, and a current limiting module connected in series. The input end of the AC / DC conversion module constitutes the input end of the power adapter unit, and the output end of the current limiting module constitutes the output end of the power adapter unit.

[0006] In the above-mentioned technical solution for the railway signal light source, a more specific technical solution may be: the current limiting module includes a variable resistor component for adjusting the output current of the power adapter unit.

[0007] In some possible implementations, the variable resistor assembly includes a plurality of fixed resistors connected in parallel, and the number of the fixed resistors connected to the circuit is changed to adjust the equivalent resistance value of the variable resistor assembly.

[0008] In some possible implementations, the variable resistor component is a continuously adjustable resistor.

[0009] In some possible implementations, the output current of the power adapter unit is adjusted to above 85mA.

[0010] In some possible implementations, the LED load unit is an LED lamp panel formed by multiple LED beads connected in parallel.

[0011] In some possible implementations, the power of the LED panel is 3W.

[0012] In some possible implementations, the fastener is steel-plastic putty, which covers and cures the connection between the mounting plate and the conductive base.

[0013] By adopting the above technical solution, this utility model has the following beneficial effects compared with the prior art: 1. The internal light source of the existing railway signal is modified. The original halogen tungsten bulb's lamp head and its external fixing and electrical interface are retained. A filamentless LED load unit replaces the original tungsten filament light emitter. The LED load unit is electrically connected to the lamp head's electrical interface via a power adapter unit. The LED load unit and power adapter unit are integrated into a mounting plate and securely fixed to the lamp head with fasteners, achieving direct compatibility with existing railway signaling, significantly reducing upgrade costs and construction complexity. Simultaneously, the LED load unit fundamentally eliminates filament burnout caused by filament sublimation and mechanical vibration, greatly improving light source reliability and extending service life. The power adapter unit integrates AC / DC conversion, rectification, filtering, and current limiting modules, providing stable DC drive for the LED load and ensuring signal display stability in various environments. The overall mechanical fixing of the mounting plate and fasteners further enhances internal connection strength and shock resistance, adapting to the harsh working environment of continuous vibration in railway stations.

[0014] 2. The current limiting module is equipped with a variable resistor component, which enables the power adapter unit to have an adjustable output current. This allows technicians to accurately calibrate and adaptively adjust the operating current of the light source according to the actual ambient lighting conditions, signal display distance, and LED device aging. This optimizes power consumption and may extend the life of the LED while ensuring that the brightness and clarity of the signal display meet the standards, thereby enhancing the product's on-site adaptability and maintainability.

[0015] 3. The variable resistor assembly consists of multiple parallel resistors, which is simple, reliable and low cost. It does not require a complex electronic voltage regulation circuit. The resistance value is adjusted by physically increasing or decreasing the number of resistors connected to the circuit. The adjustment method is intuitive and facilitates quick on-site operation and troubleshooting. At the same time, the parallel design helps to distribute current and heat, which improves the reliability and durability of the adjustment assembly.

[0016] 4. With the output current adjusted to above 85mA, it can reliably drive the relevant relays in the indoor microcomputer interlocking circuit of the railway signaling system, ensuring the electrical compatibility of the light source with the existing signal control system.

[0017] 5. The LED load unit is a lamp panel formed by parallel lamp beads, which greatly improves the fault tolerance rate of the light source and the reliability of the system, meeting the stringent requirements of railway signaling equipment for high reliability.

[0018] 6. Limiting the power of the LED light panel to 3W can achieve lower energy consumption and heat generation while meeting display brightness requirements, which helps to further improve the energy efficiency ratio and long-term working stability of the entire light source.

[0019] 7. The mounting plate and conductive base are covered and cured with steel-plastic putty, which not only achieves a firm and reliable mechanical connection between the mounting plate and the irregular lamp head surface, effectively resisting the continuous vibration environment of the railway, but also the overall structure formed by the curing of the putty can play a role in moisture-proof, dust-proof and insulation protection, significantly improving the environmental adaptability and long-term working safety of the internal electrical unit. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the light source structure of this railway signal.

[0021] Figure 2 This is the circuit diagram of the light source for this railway signal.

[0022] The following are the labels in the diagram: 1. Conductive base; 2. Steel-plastic putty; 3. Mounting plate; 4. LED light panel; 5. AC / DC conversion module; 6. Rectifier module; 7. Filter module; 8. Current limiting module. Detailed Implementation

[0023] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments: Figure 1 and Figure 2 The railway signal light source shown mainly includes a conductive base 1, a mounting plate 3, a power adapter unit, and an LED load unit. Both the LED load unit and the power adapter unit are mounted on the mounting plate 3, which is fixed to the conductive base 1 with fasteners. The conductive base 1 is modified from an existing halogen tungsten lamp in the railway signal. During the modification, the glass bulb shell and internal tungsten filament of the original halogen tungsten bulb are removed, while the metal or ceramic lamp head portion is completely retained. This lamp head portion retains the original external threaded or bayonet fixing structure and electrical interface, allowing it to directly mate with the existing railway signal lamp holder, achieving mechanical fixation and electrical connection without requiring any modifications to the signal lamp holder or power supply line, thus reducing upgrade costs and construction difficulty.

[0024] Mounting plate 3 is made of insulating rigid board. Its lower end is fixedly connected to the upper end of conductive base 1 by fasteners. In this embodiment, steel plastic putty 2 is selected as the fastener. The steel plastic putty 2 completely covers the connection between mounting plate and conductive base 1. After curing, it forms a solid connection structure, which can not only resist the continuous vibration and impact of railway station, but also play a role in moisture-proof, dust-proof and insulation protection, and improve the environmental adaptability of internal components.

[0025] Both the LED load unit and the power adapter unit are mounted on the mounting plate 3. The LED load unit is an LED lamp panel 4 formed by multiple LED beads connected in parallel. The parallel arrangement can improve the fault tolerance rate of the light source. Even if a single LED bead fails, it will not cause the entire light source to fail. In this embodiment, the power of the LED lamp panel 4 is set to 3W, which achieves low energy consumption and low heat generation while meeting the signal display brightness requirements.

[0026] For ease of installation, the LED light panel 4 and the power adapter unit are respectively mounted on the two surfaces of the mounting plate 3. The input end of the power adapter unit is connected to the electrical interface of the conductive base 1 via a wire to obtain external power supply; the output end is connected to the electrode pins of the LED light panel 4 via a wire to form a complete power supply circuit. The power adapter unit includes a circuit board and an AC / DC conversion module 5, a rectifier module 6, a filter module 7, and a current limiting module 8 connected in series on the circuit board. The input end of the AC / DC conversion module 5 constitutes the input end of the power adapter unit, converting high-voltage AC power into low-voltage DC power; the rectifier module 6 uses a bridge rectifier circuit to convert low-voltage DC power into pulsating DC power; the filter module 7 uses electrolytic capacitors to smooth the pulsating DC power, outputting a relatively stable DC voltage; the output end of the current limiting module 8 constitutes the output end of the power adapter unit, which is responsible for stabilizing the output current within the range required for the operation of the LED light panel 4.

[0027] Preferably, to achieve adaptive adjustment of the light source brightness, the current limiting module 8 includes a variable resistor component for adjusting the output current of the power adapter unit. This variable resistor component can adjust its output current to above 85mA to ensure reliable driving of the relevant relays of the existing indoor microcomputer interlocking system of the railway, while meeting the light intensity requirements of the LED light panel 4. As a specific embodiment of the variable resistor component, it may include multiple fixed resistors connected in parallel. The total resistance value of the component can be adjusted by changing the number of resistors connected to the circuit, thereby achieving the adjustment of the output current of the power adapter unit. For this embodiment, the resistor connection method can adopt two schemes: one is to fix the required number of resistors on the circuit board of the mounting plate by welding according to the on-site requirements for relay driving current and light intensity, thereby achieving fixed resistance value adjustment; by welding or removing a specific number of resistors, the parallel equivalent resistance value can be changed, thereby accurately setting the output current of the power adapter unit. Another option is to use a quick-connect structure. A quick-connect interface matching the resistor is set on the circuit board of the mounting plate 3. The two ends of the resistor are provided with corresponding quick-connect terminals. By inserting or pulling out the quick-connect terminals of the resistor into the quick-connect interface, the number of resistors connected to the circuit can be quickly increased or decreased. This structure makes it convenient for on-site technicians to calibrate and maintain the output current on-site according to relay drive requirements, ambient light, or device aging, thereby ensuring system reliability and display effect simultaneously.

[0028] As another specific implementation of the variable resistor component, it can also be a continuously adjustable resistor, such as a potentiometer or a rheostat. By directly adjusting the resistance value of this adjustable resistor, the output current of the power adapter unit can be changed continuously and linearly, thus achieving the purpose of stabilizing the current to the desired value.

[0029] During operation, external power is input to the power adapter unit through the electrical interface of the conductive base 1. After the AC to DC conversion module 5 converts the AC power to DC power, it is then rectified by the rectifier module 6 and filtered by the filter module 7 to remove current ripple. Finally, the current is stably adjusted to above 85mA by the current limiting module 8 and output to the LED light panel 4 to drive the LED light panel 4 to emit light, thereby realizing the stable display of railway signals.

[0030] This railway signal light source underwent field testing on the D38 signal at a marshalling yard. Test results showed that the light source exhibits excellent luminous effect, achieving a full-moon illumination and uniform light spot display effect without adjusting the focal length between the lamp panel and the signal's focusing glass. Simultaneously, it stably drives the filament relay and signal relay combination originally paired with the indoor halogen tungsten bulb, successfully integrating into the existing railway signal interlocking system, demonstrating its complete compatibility and practicality, and meeting the conditions for widespread application. Compared to traditional halogen tungsten bulbs, this light source uses a filamentless LED light-emitting structure, fundamentally solving the problems of filament sublimation aging and vibration-induced breakage. Its service life can reach 50,000-100,000 hours, significantly reducing the failure frequency and replacement cost of signal bulbs. With extremely low modification costs, it achieves a significant upgrade in the reliability of railway signal light sources and a substantial extension of maintenance cycles.

Claims

1. A light source for a railway signal, characterized in that: The system includes a conductive base, a mounting plate, a power adapter unit, and an LED load unit. The conductive base is the lamp head portion of the original halogen tungsten lamp of the railway signal, retaining its external fixing structure and electrical interface. The mounting plate is fixed to the conductive base with fasteners. The LED load unit and the power adapter unit are both mounted on the mounting plate. The input terminal of the power adapter unit is electrically connected to the electrical interface of the conductive base, and the output terminal is electrically connected to the LED load unit. The power adapter unit includes an AC / DC conversion module, a rectifier module, a filter module, and a current limiting module connected in series. The input terminal of the AC / DC conversion module constitutes the input terminal of the power adapter unit, and the output terminal of the current limiting module constitutes the output terminal of the power adapter unit.

2. The railway signal light source according to claim 1, characterized in that: The current limiting module includes a variable resistor component for adjusting the output current of the power adapter unit.

3. The railway signal light source according to claim 2, characterized in that: The variable resistor assembly includes multiple fixed resistors connected in parallel, and the equivalent resistance value of the variable resistor assembly is adjusted by changing the number of the fixed resistors connected to the circuit.

4. The railway signal light source according to claim 2, characterized in that: The variable resistor component is a continuously adjustable resistor.

5. The railway signal light source according to any one of claims 1 to 4, characterized in that: The output current of the power adapter unit is adjusted to above 85mA.

6. The railway signal light source according to claim 5, characterized in that: The LED load unit is an LED lamp panel formed by multiple LED beads connected in parallel.

7. The railway signal light source according to claim 6, characterized in that: The power of the LED light panel is 3W.

8. The railway signal light source according to claim 1, characterized in that: The fastener is steel-plastic putty, which is applied to and cured at the connection between the mounting plate and the conductive base.

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