Special electric heating element for railway turnout snow melting system

Abstract

The utility model discloses a special electric heating element for a railway turnout snow melting system, which comprises a stainless steel pipe sleeve and a detachable connecting device, and the section of the stainless steel pipe sleeve is a rounded rectangle; the graphene heater is characterized in that a graphene heating body is arranged in the stainless steel pipe sleeve, and a mica insulating sheet and magnesium oxide are filled between the stainless steel pipe sleeve and the graphene heating body; an outgoing line is arranged at the tail part of the graphene heating body and is connected with a plug of the detachable connecting device; the electric heating element further comprises two leading-out wires, the front ends of the two leading-out wires are connected with the socket of the detachable connecting device, the tail ends of the two leading-out wires are led into the isolation transformer, the first leading-out wire and the second leading-out wire are connected through the detachable connecting device, and when the electric heating element is replaced, only the graphene heating body needs to be replaced, and the two leading-out wires do not need to be detached. The electric heating element provided by the utility model has the advantages of high fitting degree with the stock rail, long service life, good energy-saving property, small influence of external factors on heat uniformity and temperature rise rate, short replacement time and low maintenance cost of the electric heating element.

Description

Technical Field

[0001] The utility model relates to the technical field of railway turnout snow melting, in particular to an electric heating element in an electric heating turnout snow melting system. Background Art

[0002] Turnouts are track connection equipment for trains to switch from one line to another. They are the most critical special equipment on railway lines. In winter, there is a lot of rain, snow and freezing weather in my country. If snow or ice accumulates at the turnout, it will cause poor turnout conversion, affect the close fit and locking of the turnout, and then affect driving, posing a threat to the safety and efficiency of railway transportation. At present, my country has installed corresponding turnout snow melting systems on turnouts to deal with snow and ice accumulation on turnouts. The most widely used and widely used is the electric heating turnout snow melting system. Taking the RD1 electric heating turnout snow melting system as an example, the system consists of a remote control center, a station control center, a snow melting control cabinet, a meteorological station, an isolation transformer, a rail temperature sensor and an electric heating element.

[0003] The electric heating elements currently used adopt a resistive heating method. The heating element used in the electric heating element is mainly made of metal materials such as nickel-chromium alloy. Metal materials will oxidize during use and have a short lifespan. In addition, there are "hot spots" in the metal material during the heating process, so its thermal uniformity is poor. In addition, the electric-thermal conversion rate of the metal material is also low, so more electricity is consumed during use, and the energy saving performance is poor.

[0004] The electric heating element currently used and its lead wires introduced into the isolation transformer are integrated. If the electric heating element is damaged and needs to be replaced, its lead wires must also be replaced. When replacing the lead wires, the lead wires of the original electric heating element must be removed from the isolation transformer first, and then the clamps and cable protective covers on the lead wires must be removed. When installing a new electric heating element, the new lead wires must be led into the isolation transformer for wiring and the cable protective cover must be installed, which is not only time-consuming, but also causes waste of clamps and cable protective covers.

[0005] In summary, improving the service life, thermal uniformity, and electric-to-heat conversion rate of existing electric heating elements and shortening the replacement time of electric heating elements are issues that need to be improved in the currently used electric heating elements. Summary of the invention

[0006] The purpose of the utility model is to provide a special electric heating element for a railway turnout snow melting system so as to solve the problems raised in the above-mentioned background technology.

[0007] To achieve the above purpose, the utility model provides a special electric heating element for a railway turnout snow melting system, comprising a stainless steel pipe sleeve and a detachable connecting device, wherein a graphene heating element is arranged in the stainless steel pipe sleeve, and a heat-conducting and insulating material is filled between the stainless steel pipe sleeve and the graphene heating element. The tail end of the graphene heating element has a lead wire; the electric heating element also includes two lead wires introduced into an isolation transformer, and the front end of the lead wires is connected to the detachable device; the detachable connecting device is used to connect the first lead wire with the second lead wire.

[0008] The utility model changes a metal outer pipe sleeve into a stainless steel pipe sleeve, thereby improving the corrosion resistance and anti-corrosion ability of the pipe sleeve; the cross-section of the stainless steel pipe sleeve is a rounded rectangle, which can fit the basic rail more closely during installation; the metal material heating element is changed into a graphene heating element, and graphene, as an inorganic non-metallic material, has a better thermal conductivity and service life than metal materials; and the graphene heating element is wrapped with a mica insulating sheet to improve the stability of the graphene heating element in the pipe; magnesium oxide is filled between the mica insulating sheet and the stainless steel pipe sleeve to improve the thermal conductivity of the electric heating element.

[0009] The utility model uses a detachable connecting device, including a socket and a plug, a lead wire at the tail end of the graphene heating element is connected to the plug, and two lead wires introduced into the isolation transformer are connected to the socket; if the electric heating element is damaged and needs to be replaced, it is only necessary to unplug the plug and the socket and replace the graphene heating element, and there is no need to replace the two lead wires and the cable protective cover and the clamp on the two lead wires.

[0010] The beneficial effects of the utility model are:

[0011] (1) The electric heating element disclosed by the utility model has a long service life and a high electric-to-heat conversion rate: Graphene is a single-molecule two-dimensional nanomaterial with a thermal conductivity of up to 5300 W / (m*k), which is several times better than that of metals, and there is no oxidation during the heating process.

[0012] (2) The electric heating element disclosed in the utility model can reduce the consumption of electric energy during the heating process and has good energy-saving performance: a small amount of current can increase the temperature of the graphene heating element and quickly transfer the heat. A part of the heat energy is transmitted outward in the form of far infrared, and the conversion rate of this part of the heat energy is more than 80%.

[0013] (3) The electric heating element disclosed in the present invention has a high temperature rise rate and good thermal uniformity: changes in ambient temperature and increases in tensile displacement have little effect on the average temperature rise rate of the graphene heating element, and the graphene heating element can maintain good thermal uniformity, thereby ensuring uniform heating during the heating process.

[0014] (4) The heating effect of the electric heating element disclosed in the utility model can still meet the need for snow melting after being squeezed by a train: after the graphene heating element is squeezed by a train, as the degree of bending increases, its temperature rise rate will increase. Although the heating uniformity will deteriorate, it will not affect the snow melting effect of the electric heating element.

[0015] (5) The electric heating element disclosed in the utility model uses a detachable connecting device, which can shorten the time for replacing the electric heating element and avoid the waste of lead wires, cable protective covers and clamps.

[0016] In summary, the electric heating element provided by the utility model has a long service life, good energy saving, thermal uniformity and temperature rise rate are less affected by the outside world, the time taken to replace the electric heating element is short, and the maintenance cost of the electric heating element is lower. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the utility model.

[0018] Figure 2 for Figure 1 AA view.

[0019] In the figure: 1. graphene heating element, 2. mica insulating sheet, 3. magnesium oxide, 4. stainless steel pipe sleeve, 5. one lead wire, 6. detachable connecting device, 7. two lead wires. DETAILED DESCRIPTION

[0020] The utility model discloses a special electric heating element for a railway turnout snow melting system, which improves the service life, energy saving, thermal uniformity and temperature rise rate of the electric heating element; shortens the time for replacing the electric heating element, and reduces the maintenance cost of the electric heating element.

[0021] The following will be combined with the drawings in the utility model to clearly and completely describe the specific embodiments of the utility model, but the following description is only one embodiment of the utility model, not all. Other embodiments obtained by personnel in the technical field based on the embodiments of the utility model without creative work belong to the protection scope of the utility model.

[0022] As attached Figure 1 As shown, the utility model provides a special electric heating element for a railway turnout snow melting system, including a stainless steel pipe sleeve 4 and a detachable connecting device 6. The stainless steel pipe sleeve 4 has better corrosion resistance and anti-corrosion ability than metal pipe sleeves. A straight graphene heating element 1 is arranged in the stainless steel pipe sleeve 4. Mica insulating sheets 2 and magnesium oxide 3 are used as fillings between the graphene heating element 1 and the stainless steel pipe sleeve 4.

[0023] After the electric heating element is powered by the isolation transformer, the molecules in the graphene heating element 1 in the stainless steel pipe sleeve 4 generate heat in a "Brownian motion" manner and emit infrared radiation, forming an electric energy-heat energy conversion. The heat is transferred to the turnout through the stainless steel pipe sleeve 4 to heat the frozen part of the turnout.

[0024] As attached Figure 2 As shown, the cross section of the stainless steel tube sleeve 4 of the electric heating element provided by the utility model is a rounded rectangle, which has a higher fit with the base rail. The outside of the graphene heating element 1 is wrapped by a mica insulating sheet 2, which fixes the graphene heating element 1 and achieves good insulation of the electric heating element. Magnesium oxide 3 is filled between the mica insulating sheet 2 and the stainless steel tube sleeve 4 to improve the thermal conductivity of the electric heating element.

[0025] The detachable connecting device 6 is composed of a plug 61 and a socket 62, and its function is to connect a lead wire 5 led out from the graphene heating element 1 and a second lead wire 7 introduced into the isolation transformer, and to separate the two when the graphene heating element 1 is replaced. In order to improve the service life of the detachable connecting device 6, the detachable connecting device 6 meets the requirements of firmness, corrosion resistance, waterproofness, and extrusion resistance.

[0026] The two lead wires 7 and the graphene heating element 1 of the electric heating element provided by the utility model are arranged separately. When the graphene heating element 1 is damaged and needs to be replaced, it is only necessary to remove the graphene heating element 1 and one of its lead wires 5 from the plug 61 of the detachable connecting device 6, and then connect the one lead wire 5 of the replaced new graphene heating element 1 to the plug 61 of the cable connecting device 6.

[0027] Therefore, it can be known that when replacing the electric heating element provided by the utility model, only the graphene heating element 1 and the one lead wire 5 need to be replaced, and there is no need to remove the two lead wires 7 from the socket 62 and the isolation transformer. This avoids the introduction of new two lead wires 7 and also avoids the wiring of the new two lead wires 7 in the isolation transformer, thereby shortening the time for replacing the electric heating element.

[0028] In addition, since the two lead wires 7 do not need to be replaced, the clamps and cable protective covers on the two lead wires 7 can be used normally, avoiding the waste of the two lead wires 7, the clamps and the cable protective covers, and reducing the maintenance cost of the electric heating element.

[0029] The shape of the electric heating element provided by the present invention can be changed according to the different installation positions of the electric heating element. The shape of the electric heating element can be selected according to actual conditions and is not limited in this example.

[0030] According to actual conditions, the length of the two lead wires 7 of the electric heating element provided by the utility model can be selected according to the distance from the isolation transformer on site. The utility model does not limit it, which can effectively save the cost of the electric heating element.

[0031] The electric heating element disclosed in the utility model is not limited in scope of use. It can be installed on the basic rail of the turnout with a special fixture for heating, and can also be installed on the point rail, the heart rail, the outer locking device of the turnout and other icy parts for heating.

[0032] The above is a preferred embodiment of the present invention. For those skilled in the art, optimizing this embodiment based on the principle of the present invention is also considered to be within the protection scope of the present invention.

Claims

1. A special electric heating element for a railway turnout snow melting system, comprising a stainless steel pipe sleeve (4) and a detachable connecting device (6), characterized in that A graphene heating element (1) is contained in the stainless steel tube sleeve (4), and heat-conducting and insulating materials are filled between the stainless steel tube sleeve (4) and the graphene heating element (1).

2. The special electric heating element for railway turnout snow melting system according to claim 1 is characterized in that: The outside of the graphene heating element (1) is wrapped with a mica insulating sheet (2).

3. The special electric heating element for railway turnout snow melting system according to claim 2 is characterized in that: Magnesium oxide (3) is filled between the mica insulating sheet (2) and the stainless steel pipe sleeve (4).

4. The special electric heating element for railway turnout snow melting system according to claim 1 is characterized in that: A lead wire (5) is provided at the rear end of the graphene heating element (1), and the lead wire (5) is introduced into a plug (61) of a detachable connecting device (6); the electric heating element also includes two lead wires (7) introduced into an isolation transformer, and the front ends of the two lead wires (7) are connected to a socket (62) of the detachable connecting device (6).

5. The special electric heating element for railway turnout snow melting system according to claim 4 is characterized in that: The detachable connecting device (6) connects the first lead wire (5) and the second lead wire (7) together.

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