A door heating and de-icing device for a rail vehicle
The heating and de-icing device, which combines a flexible PTC heating element and a thermally conductive silicone layer, solves the problem of ice buildup in the gaps of rail vehicle doors, achieving efficient and low-energy de-icing and extending the service life of the door seals.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- DALIAN DINGLI RAIL TRANSIT EQUIP CO LTD
- Filing Date
- 2025-09-04
- Publication Date
- 2026-06-19
AI Technical Summary
When rail vehicles are operating in cold regions, the door seals at the gaps in the doors are prone to freezing, causing the doors to become stuck and the sealing performance to deteriorate. Existing electric heating wire heating methods are energy-intensive and prone to secondary freezing.
By combining a flexible PTC heating element with a thermally conductive silicone layer, and through temperature self-regulation heating, combined with a nano-hydrophobic coating and drainage microchannels, uniform heating of the sealing surface and rapid ice melting are achieved, thus preventing water accumulation.
It effectively prevents ice formation on the sealing surface, improves de-icing efficiency, reduces energy consumption, extends the life of the sealing strip, ensures the sealing performance of the car door, and is easy to install without requiring major modifications to the car door structure.
Smart Images
Figure CN224375587U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of rail transit technology, and more specifically, to a heating and de-icing device for rail vehicle doors. Background Technology
[0002] Rail transit refers to a type of transportation or system where vehicles operate on specific tracks. The most typical rail transit system is the railway system, composed of traditional trains and standard railways. With the diversified development of train and railway technology, rail transit has taken on increasingly more types, not only covering long-distance land transportation but also being widely used in short- and medium-distance urban public transportation. Common rail transit systems include traditional railways, subways, light rail, and trams. Currently, it is essential to install door seals at the rail vehicle doors during operation to ensure the airtightness of the doors when opening and closing.
[0003] When rail vehicles (such as subways and light rails) are operating in cold regions during winter, the door seals at the gaps are prone to freezing due to low temperatures. This can cause the doors to become stuck, reduce their sealing performance, and even affect driving safety. Current technology mainly involves installing heating wires in the door seals to remove the ice. However, the heating temperature of the heating wires is uncontrollable, energy consumption is high, and melt water can easily remain on the surface of the seals, causing secondary freezing.
[0004] Therefore, in view of this, we have studied and improved the existing structure and its shortcomings, and provided a heating and de-icing device for rail vehicle doors, in order to achieve a more practical purpose. Utility Model Content
[0005] To overcome the shortcomings mentioned above, this utility model aims to provide a technical solution that can solve the problem of poor de-icing effect of door seam sealant strips in car door gaps.
[0006] To achieve the above objectives, this utility model provides the following technical solution: a heating and de-icing device for a rail vehicle door, comprising a rubber strip body, the rubber strip body including a fixing part, the fixing part being disposed on the rail vehicle door, a connecting part being disposed at one end of the fixing part, a sealing part being disposed at one end of the connecting part, a flexible PTC heating element being disposed inside the sealing part, a heat insulation layer being disposed on the outer surface of the sealing part, one side of the sealing part being a sealing surface, and a drainage microchannel being formed on the surface of the sealing surface.
[0007] In a preferred embodiment, the flexible PTC heating element is arranged along the length of the sealing portion, and the end of the flexible PTC heating element is connected to a power supply interface.
[0008] In a preferred embodiment, the outer surface of the flexible PTC heating element is covered with a thermally conductive silicone layer.
[0009] In a preferred embodiment, a temperature sensor is embedded in the surface of the sealing surface.
[0010] In a preferred embodiment, the sealing surface is coated with a nano-hydrophobic coating that extends into the drainage microchannels.
[0011] The technical effects and advantages of this utility model are as follows:
[0012] This rail vehicle door heating and de-icing device uses a flexible PTC heating element integrally injection-molded into the rubber strip body. The heating element is filled with a thermally conductive silicone layer, which allows heat to be evenly transferred to the sealing surface of the sealing part. By achieving temperature self-regulating heating of the sealing surface, it can effectively prevent icing from forming on the sealing surface. Furthermore, since the fixing part can be directly installed on the rail vehicle door by pressing, there is no need to significantly modify the door structure, thus improving installation efficiency.
[0013] The rail vehicle door heating and de-icing device uses drainage microchannels and a nano-hydrophobic coating on the sealing surface. The nano-hydrophobic coating reduces the adhesion of ice on the sealing surface and accelerates the heating and detachment of ice to promote the melting of ice. The drainage microchannels can drain residual melt water and prevent local water accumulation on the sealing surface.
[0014] The heating and de-icing device for the rail vehicle door uses an insulation layer on the sealing part. While the insulation layer meets the heating and insulation requirements of the flexible PTC heating element, it can also indicate the reduction of insulation performance through color display, which facilitates material maintenance. Attached Figure Description
[0015] To more clearly illustrate the embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.
[0016] Figure 1 This is a schematic diagram of the overall planar structure of the present invention;
[0017] Figure 2 This utility model Figure 1 Cross-sectional view;
[0018] Figure 3 This utility model Figure 2 Enlarged view of section A in the middle;
[0019] Figure 4 This utility model Figure 2 Enlarged view of section B in the middle.
[0020] The attached figures are labeled as follows: 1. Fixing part; 2. Connecting part; 3. Sealing part; 4. Flexible PTC heating element; 5. Temperature sensor; 6. Insulation layer; 7. Drainage microchannel; 8. Thermally conductive silicone layer; 9. Nano-hydrophobic coating. Detailed Implementation
[0021] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.
[0022] See also Figures 1-4 This utility model provides a heating and de-icing device for rail vehicle doors, including a rubber strip body. The rubber strip body includes a fixing part 1, which is installed on the rail vehicle door. One end of the fixing part 1 is provided with a connecting part 2, and one end of the connecting part 2 is provided with a sealing part 3.
[0023] The fixing part 1 is arranged in an "arrow" shape, which can be pressed into the existing rail car door mounting groove for fixing. Since the fixing part 1 can be directly installed on the rail car door by pressing, there is no need to make major modifications to the door structure. The existing rubber strip structure can be directly replaced, which can improve the installation efficiency of the rail vehicle door heating and de-icing device on the door. The connecting part 2 can connect the sealing part 3 on the fixing part 1. The sealing part 3 can seal the gap when the rail car door is opened and closed.
[0024] In this embodiment: a flexible PTC heating element 4 is provided inside the sealing part 3. The flexible PTC heating element 4 is arranged along the length direction of the sealing part 3, and the end of the flexible PTC heating element 4 is connected to a power supply interface.
[0025] The current flexible PTC heating element 4 is a self-temperature-controlled heating element that combines PTC material with a flexible structure. It has the characteristic of "temperature-resistance self-regulation": when the temperature is below the threshold, the resistance is low and the heating power is high; when the temperature approaches the upper limit of the rubber strip body's tolerance, the resistance increases sharply and the power drops sharply to avoid local overheating. Since the flexible PTC heating element 4 is existing technology, it will not be described in detail here. The power supply interface can provide the flexible PTC heating element 4 with an input interface for electricity and signals. The specific electricity and signal input wiring technology is a conventional method in this field and will not be described in detail here.
[0026] The flexible PTC heating element 4 and the rubber strip body are integrally molded through injection molding, which simplifies the installation structure. Because the flexible PTC heating element 4 utilizes the self-regulating properties of PTC material to strictly control the heating temperature (≤70℃), far below the critical aging temperature of the rubber strip body, it extends the service life of the rubber strip body by at least 2-3 times, preventing overheating and embrittlement. As the core heating element, the flexible PTC heating element 4 has a "temperature-resistance self-regulating" characteristic, effectively avoiding localized overheating of the sealing surface. When the sealing surface freezes due to low temperatures, the flexible PTC heating element 4 uniformly heats the sealing surface of the sealing part 3, and the heat melts the ice. This prevents the rubber strip body from failing to seal at the door gaps when the rail vehicle door opens and closes, effectively solving the technical problem of door gap rubber strips easily freezing due to low temperatures, leading to door opening / closing jams and reduced sealing performance. Compared to traditional methods using heating wires for de-icing, this effectively reduces de-icing energy consumption and improves de-icing quality.
[0027] In this embodiment, the outer surface of the flexible PTC heating element 4 is covered with a thermally conductive silicone layer 8.
[0028] The thermally conductive silicone layer 8 can be pre-applied during the injection molding process of the flexible PTC heating element 4 and the rubber strip body. The thermally conductive silicone layer 8 can effectively fill the gap between the flexible PTC heating element 4 and the rubber strip body, ensuring that the heat of the flexible PTC heating element 4 is evenly transferred to the sealing surface of the sealing part 3, thus improving the de-icing efficiency.
[0029] In this embodiment, a heat insulation layer 6 is provided on the outer surface of the sealing part 3. The heat insulation layer 6 is composed of polyurethane and color-changing indicator.
[0030] The insulation layer 6 can be fixed to the periphery of the sealing part 3 by adhesive. The insulation layer 6, which is composed of polyurethane material, can provide insulation on the outside of the sealing part 3. This can effectively reduce the heat loss of the flexible PTC heating element 4 and improve the heat utilization rate. However, the insulation performance of the insulation layer 6 will decrease after long-term use. The color-changing indicator is an existing thermochromic pigment. When the insulation performance of the insulation layer 6 drops to less than 20%, the insulation layer 6 can change color to yellow to indicate the need for insulation maintenance.
[0031] In this embodiment: one side of the sealing part 3 is the sealing surface, and the surface of the sealing surface is provided with drainage microchannels 7.
[0032] The drainage microchannel 7 is set along the length of the sealing surface. The drainage microchannel 7 can be used to drain the residual melt water that melts due to heating on the sealing surface, thus preventing water accumulation on the sealing surface.
[0033] In this embodiment: the sealing surface is coated with a nano-hydrophobic coating 9, which extends into the drainage microchannel 7.
[0034] The nano-hydrophobic coating 9 can reduce the adhesion of ice on the sealing surface and accelerate the heating and removal of ice. Extending the coated nano-hydrophobic coating 9 into the drainage microchannel 7 can prevent ice from forming on the inner wall of the drainage microchannel 7.
[0035] In this embodiment, a temperature sensor 5 is embedded in the surface of the sealing surface.
[0036] In this application, the temperature sensor 5 is a PT1000 platinum resistance thermometer, which is embedded in the surface of the sealing surface to detect the temperature of the sealing surface. The temperature sensor 5 and the heating element in the flexible PTC heating element are electrically connected to the main controller and power supply. The main controller can be a conventional known device such as a PLC controller. The control circuit of the main controller can be implemented by those skilled in the art through simple programming. When the flexible PTC heating element 4 is working, the main controller presets a gradient heating strategy from -5℃ to 0℃: when the temperature is from -5℃ to 0℃, the flexible PTC heating element 4 starts high-power heating (rated power) to quickly melt ice; when the temperature is from 0℃ to 5℃, it switches to low-power heat preservation (50% of rated power) to prevent secondary icing; when the temperature is higher than 5℃, it automatically stops to reduce ineffective energy consumption. Therefore, by adopting the above gradient heating strategy to de-ice the rubber strip body, the heating energy consumption is effectively reduced.
Claims
1. A heating and de-icing device for rail vehicle doors, characterized in that: The device includes a rubber strip body, which includes a fixing part (1) and is installed on the door of the rail vehicle. One end of the fixing part (1) is provided with a connecting part (2) and one end of the connecting part (2) is provided with a sealing part (3). A flexible PTC heating element (4) is provided inside the sealing part (3). A heat insulation layer (6) is provided on the outer surface of the sealing part (3). One side of the sealing part (3) is a sealing surface, and a drainage microchannel (7) is opened on the surface of the sealing surface.
2. The heating and de-icing device for rail vehicle doors according to claim 1, characterized in that: The flexible PTC heating element (4) is arranged along the length direction of the sealing part (3), and the end of the flexible PTC heating element (4) is connected to the power supply interface.
3. The heating and de-icing device for rail vehicle doors according to claim 1, characterized in that: The flexible PTC heating element (4) is covered with a thermally conductive silicone layer (8).
4. The heating and de-icing device for rail vehicle doors according to claim 1, characterized in that: A temperature sensor (5) is embedded in the surface of the sealing surface.
5. A heating and de-icing device for rail vehicle doors according to claim 1, characterized in that: The sealing surface is coated with a nano-hydrophobic coating (9), which extends into the drainage microchannel (7).