Overhead power supply system for electrified rail transit

Abstract

The electrified rail transit overhead power supply system comprises a stand column, a power supply bow and a power receiving cable, and the stand column is arranged on one side of a rail; the power supply bow is mounted on the upright; the power receiving cable extends in the length direction of the traction locomotive to be arranged on the top of the traction locomotive and makes contact with the power supply bow for electric conduction. The power supply bow transmits power to the traction locomotive through the power receiving cable. The precise butt joint of the power receiving cable and the power supply bow replaces a traditional pantograph and a contact net, and the problems that the traditional contact net is unstable in power supply, prone to being affected by extreme weather, high in construction and maintenance cost and the like are successfully solved. Compared with a traditional contact network, the power supply system is simpler in structure and more convenient to maintain, the maintenance cost and human input are reduced, and a new thought and a new solution are provided for development of the rail transit power supply technology.

Description

Technical Field

[0001] The invention relates to an overhead power supply system for electrified rail transit, belonging to the technical field of rail transit power supply. Background Art

[0002] The contact network is an indispensable part of the rail system. Its stable and reliable operation is of great significance to ensure the normal operation of trains and the safe travel of passengers. Once the contact network is powered off or the pantograph of the train is in poor contact with the contact network, it will directly affect the power supply and normal operation of the train. When the contact network is facing low temperature and high humidity weather such as freezing rain, ice is easily formed on the surface. The accumulation of ice on the surface of the contact network will significantly reduce the contact quality between the pantograph and the contact network, which not only affects the efficiency of power transmission, but also may cause serious problems such as power outages, short circuits and sparks, directly threatening the normal operation of trains and the safety of passengers. In order to deal with this problem, the railway department has taken a series of deicing measures, including manual deicing, mechanical deicing and hot sliding ice melting, but these methods have exposed limitations to varying degrees in practice.

[0003] However, manual deicing is inefficient and difficult to handle large-scale ice conditions; mechanical deicing may cause physical damage to the contact network; and thermal deicing consumes a lot of energy and has certain requirements for ambient temperature. In addition, the contact line is under long-term high-load operation, coupled with excessive mechanical stress and fatigue damage caused by material aging, severe weather (such as strong winds, ice covering, and dancing), which further aggravates the difficulty of contact network maintenance. It is easy to cause contact line breakage, insulator rupture, and suspension device detachment. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art and to provide an overhead power supply system for electrified rail transit, the purpose of which is to improve power supply stability and reduce the impact of extreme weather on the power supply system.

[0005] To achieve the above object, the present invention is implemented by adopting the following technical solutions:

[0006] The present invention provides an overhead power supply system for electrified rail transit, comprising:

[0007] A column, which is used to be set on one side of the track;

[0008] A power supply pantograph, which is used to be installed on the column;

[0009] The power receiving cable is used to extend along the length direction of the traction locomotive and is set on the top of the traction locomotive, and is in contact with the power supply pantograph to conduct electricity; the power supply pantograph transmits electricity to the traction locomotive through the power receiving cable.

[0010] Furthermore, the positions of the power receiving cable near both ends are fixed to the top of the traction locomotive through fixing points.

[0011] Furthermore, a plurality of supporting devices connected to the power receiving cable are arranged at intervals along the length direction of the power receiving cable between the fixed points at both ends;

[0012] The supporting device is configured to be able to drive the connection position of the power receiving cable with the supporting device to perform lifting and lowering activities and lateral movement.

[0013] Furthermore, it also includes a control device:

[0014] The control device controls the lateral pulling force applied by the supporting device to the power receiving cable. , so that the sag of the receiving cable Stay within the preset threshold;

[0015] The length of the cable between the two supporting devices is defined as L, and the weight per unit length of the cable is defined as , the offset distance that the supporting device pulls the receiving cable out laterally relative to the center line of the pantograph is defined as , the sag of the cable is ; then the axial tension and lateral tension The calculation is done using the following formula:

[0016] .

[0017] Furthermore, the portion of the cable from the fixed point to the closest supporting device is defined as a slope section, and the ratio of the vertical envelope range H of the slope section to the span S is defined as the slope value of the slope section. ,Right now:

[0018] ;

[0019] The control device adjusts the slope value of the slope section by controlling the support device to raise the height of the power cable. , so that the slope value Not higher than the allowable slope value ; When the running speed of the traction locomotive The higher the slope, the more The smaller.

[0020] Furthermore, the threshold is .

[0021] Furthermore, a power supply arm is installed on the column; and the power supply bow is installed at the end of the power supply arm.

[0022] Further, it includes a cross arm and a feeder;

[0023] The cross arm is installed on the column; the feeder is installed on the cross arm and is electrically connected to the power supply arm and the power supply bow.

[0024] Furthermore, the supporting device comprises:

[0025] Body;

[0026] A transverse driving mechanism is arranged on the top of the traction locomotive; the machine body is mounted on the transverse driving mechanism and can be driven by the transverse driving mechanism to move along the width direction of the traction locomotive;

[0027] The lifting drive mechanism is arranged on the machine body and connected to the power receiving cable, and can drive the connection position of the power receiving cable with the lifting drive mechanism to perform lifting movement.

[0028] Furthermore, under the lateral pulling force of the supporting device, the power receiving cable forms a zigzag structure on the top of the traction locomotive.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] The present invention provides an overhead power supply system for electrified rail transit, which is provided with a pantograph installed on a column and a power receiving cable extending along the length direction of the traction locomotive, and the power receiving cable is in contact with the pantograph for electrical conduction, and the pantograph transmits electricity to the traction locomotive through the power receiving cable. The present invention realizes power transmission by connecting the power receiving cable with the pantograph, replacing the traditional pantograph and contact network, and successfully solves the problems of unstable power supply, susceptibility to extreme weather, and high construction and maintenance costs of the traditional contact network. Compared with the traditional contact network, the power supply system of the present invention has a simpler structure and is more convenient to maintain, which reduces maintenance costs and manpower investment. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 A schematic diagram of the structure of an overhead power supply system provided for the implementation of the present invention;

[0032] Figure 2 A schematic diagram of the structure of a support device provided in an embodiment of the present invention;

[0033] Figure 3 A horizontal force analysis diagram of a broken line arrangement of a power receiving cable provided in an embodiment of the present invention;

[0034] Figure 4 An anchoring force analysis diagram of the end point of the power-receiving cable provided in an embodiment of the present invention.

[0035] In the figure: 1. traction locomotive; 2. receiving cable; 3. power supply pantograph; 4. wheel; 5. track; 6. column; 7. power supply arm; 8. feeder; 9. jumper; 10. cross arm; 11. first insulator; 12. supporting device; 1201. machine body; 1202. supporting insulator; 1203. transverse moving screw; 1204. fixed support; 1205. lifting worm; 1206. lifting screw; 1207. worm wheel; 13. fixed point. DETAILED DESCRIPTION

[0036] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0037] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0038] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0039] Example 1

[0040] This embodiment introduces an overhead power supply system for electrified rail transit, including: a column 6, a power supply arm 7, a power receiving cable 2, and a power supply pantograph 3.

[0041] like Figure 1As shown, a pantograph 3 is provided on the column 6. A receiving cable 2 extending along the length direction of the traction locomotive 1 is provided on the top of the traction locomotive 1, and the receiving cable 2 is in contact with the pantograph 3 for electrical conduction; the pantograph 3 transmits electricity to the traction locomotive 1 through the receiving cable 2. When the traction locomotive 1 moves along the track 5, the receiving cable 2 and the pantographs 3 on different columns 6 are connected in turn, and at the same time, the current flows back through the wheels 4 and the track 5, thereby realizing continuous and reliable power supply to the traction locomotive 1. The present invention replaces the traditional pantograph and contact network with the precise docking of the receiving cable 2 and the pantograph 3, successfully solving the problems of unstable power supply, susceptibility to extreme weather, and high construction and maintenance costs of the traditional contact network.

[0042] It should be added that a power supply arm 7, a cross arm 10, and a feeder 8 are also provided on the column 6. During installation, the power supply arm 7 can be rotated or moved along the column 6 to adapt to trains of different heights and terrain changes. The power supply pantograph 3 is installed at the end of the power supply arm 7. The cross arm 10 is used to fix and support the feeder 8, and the feeder 8 is insulated and installed on the cross arm 10 through the first insulator, and the electrical connection with the live end of the power supply arm 7 and the power supply pantograph 3 is realized through the jumper 9.

[0043] For example, the feeder 8 may use a single, double-split or multi-split steel-core aluminum stranded wire according to current and capacity requirements.

[0044] In addition, in the present embodiment, a contact slide plate is designed on the power supply pantograph 3, and the contact slide plate can be a carbon slide plate, a metal-impregnated carbon slide plate or a metal slide plate according to the contact requirements.

[0045] It should be added that the column 6 is made of high-strength, corrosion-resistant materials, such as concrete or galvanized steel, to ensure stability in harsh environments. The power cable 2 is made of highly conductive, wear-resistant materials, such as magnesium-copper alloy wire, which has high strength and wear resistance, and can withstand large friction when the high-speed rail is running at high speed, ensuring the stability of power supply.

[0046] It should be noted that the receiving cable 2 is arranged along the top of the traction locomotive 1, and its height is configured to be in contact with the pantograph 3 to achieve electrical connection. The receiving cable 2 is provided with fixed points 13 near both ends, and the receiving cable 2 is fixedly connected to the traction locomotive 1 at the fixed points 13, and the receiving cable 2 is electrically isolated from the fixed points 13 through the second insulator.

[0047] In this embodiment, the power receiving cable 2 is fixed at the fixing point 13 by anchoring.

[0048] Example 2

[0049] The difference between this embodiment and embodiment 1 is that in this embodiment, a control device and a supporting device 12 are further provided.

[0050] Specifically, a plurality of support devices 12 for fixing the power receiving cable 2 are arranged at intervals along the length direction of the power receiving cable 2 between the fixing points 13 at both ends; the support device 12 is configured to drive the connection position of the power receiving cable 2 with the support device 12 to move up and down and laterally.

[0051] Furthermore, the support device includes: a transverse drive mechanism of the machine body 1201 and a lifting drive mechanism. The transverse drive mechanism is arranged on the top of the traction locomotive 1; the machine body 1201 is installed on the transverse drive mechanism, and can be driven by the transverse drive mechanism to move along the width direction of the traction locomotive 1. The lifting drive mechanism is arranged on the machine body 1201 and connected to the power receiving cable 2, and can drive the connection position of the power receiving cable 2 with the lifting drive mechanism to perform lifting activities.

[0052] For example, see Figure 2 As a specific implementation, in this embodiment, the support device 12 includes: a body 1201, a support insulator 1202, a transverse moving screw 1203, a lifting worm 1205, a lifting screw 1206, and a worm wheel 1207. Two transverse moving screws 1203 are arranged at the bottom of the body 1201, which are parallel to each other and extend along the width direction of the traction locomotive 1. The two ends of the transverse moving screws 1203 are rotatably mounted on the roof of the traction locomotive 1 through fixed supports 1204. And the ends of the two transverse moving screws 1203 are connected to a displacement control motor to obtain a rotational driving force. There are four support insulators 1202, which are all fixed at the bottom of the body 1201 and distributed in a matrix. A threaded sleeve matching the transverse moving screw 1203 is fixed on the support insulator 1202. Each transverse moving screw 1203 corresponds to two support insulators 1202, and the transverse moving screw 1203 passes through and is screwed to the corresponding threaded sleeve. The transverse moving lead screw 1203 can drive the machine body 1201 to move transversely when rotating through the threaded connection with the threaded sleeve. A lifting drive box is arranged on the top of the machine body 1201, and a rotatable lifting lead screw 1206 is arranged to penetrate through the lifting drive box. The lifting lead screw 1206 is threadedly sleeved with a worm wheel 1207, and the worm wheel 1207 is rotatably arranged in the lifting drive box. The lifting drive box is equipped with a lifting worm 1205 meshing with the worm wheel 1207. The end of the lifting worm 1205 is connected to the output end of a lifting control motor. The lifting control motor is used to drive the lifting worm 1205, thereby driving the worm wheel 1207 to rotate. When the worm wheel 1207 rotates, it can drive the lifting lead screw 1206 to perform lifting activities. The receiving cable 2 is installed on the top of the lifting lead screw 1206.

[0053] Exemplarily, the installation method of the power receiving cable 2 and the lifting screw 1206 can be achieved through a transition component, which has a mounting sleeve 1 mounted on the end of the lifting screw 1206 and a mounting sleeve 2 mounted on the power receiving cable 2, thereby connecting the lifting screw 1206 and the power receiving cable 2 together.

[0054] Among them, the lifting control motor and the two displacement control motors are all connected to the control device, and their working states are controlled by the control device, so as to adjust the lifting height of the lifting screw rod 1206, as well as the lateral direction and lateral displacement distance of the body 1201.

[0055] In addition, it should be noted that in other embodiments, the support device 12 can also be constructed by two sets of linear motors arranged horizontally and vertically, and the machine body 1201 is driven by the linear motor arranged horizontally to move horizontally, and the linear motor arranged vertically is installed on the machine body 1201 and connected to the power receiving cable 2, so as to drive the power receiving cable 2 to move horizontally and lift together with the linear motor arranged horizontally. Each linear motor is also controlled by the control device.

[0056] Furthermore, the initial position of the power receiving cable 2 is located at the center line of the power supply pantograph 3. During installation, the power receiving cable 2 is horizontally staggered on the top of the traction locomotive 1 through the supporting device 12 to form a zigzag structure. This installation method can make the loss of the entire power supply pantograph 3 more uniform and avoid the problem of excessive local wear caused by eccentric wear.

[0057] Among them, under the force of the support device 12, the connection position of the receiving cable 2 and the support device 12 will be offset relative to the center line of the power supply pantograph 3, and the lateral offset distance between the connection position of the receiving cable 2 and the support device 12 and the center line of the power supply pantograph 3 is defined as the pull-out value , the dynamic envelope of the pantograph 3 should not only consider the 2-fold pull-out value, but also the deviation between the actual position and the designed position of the traction locomotive 1, the left and right swaying of the vehicle and the track deviation, the stiffness of the support assembly 12 and the receiving cable 2, and the inclination of the bow head.

[0058] Furthermore, if Figure 3 As shown, the length of the power cable between the two supporting devices 12 is defined as L, and the unit length deadweight of the power cable 2 is defined as , the offset distance of the support device 12 pulling the receiving cable 2 laterally relative to the center line of the pantograph 3 is defined as , the sag of the cable 2 is . Then the cable 2 is subject to its own axial tension And define the lateral tension on the cable 2 The calculation is done using the following formula:

[0059] .

[0060] like Figure 1 and Figure 4 As shown, in order to ensure that the pantograph 3 of the traction locomotive 1 is always within the vertical envelope of the slope section of the power cable 2 during the travel process, In the process, the height of the column 6, the power supply arm 7 and the power supply pantograph 3 should be adjusted according to the height of the track 5, the change of the carrying height of the traction locomotive 1 and the height of the power receiving cable 2 after lifting, so that the height difference between the power receiving cable 2 and the power supply pantograph 3 near At the same time, the minimum air insulation gap between the receiving cable 2, the power supply arm 7 and the traction locomotive 1 and other working parts should also be taken into consideration.

[0061] like Figure 4 As shown, in order to control the impact of the contact between the cable 2 and the pantograph 3 during the travel of the traction locomotive 1, in this embodiment, the slope value of the slope section of the cable 2 is controlled. The method is to reduce the impact of the contact between the cable 2 and the pantograph 3. The details are as follows:

[0062] Define the portion of the cable 2 from the fixed point 13 to the closest support device 12 as the slope section, and define the vertical envelope range of the slope section of the cable 2 With span Ratio is the slope value of the slope segment ,Right now:

[0063] ;

[0064] The control device controls the support device 12 to raise the height of the receiving cable 2 to adjust the slope allowable value of the slope section. ; When the running speed of traction locomotive 1 The higher the slope, the allowable slope value of the slope section of the cable The smaller.

[0065] The control device applies a lateral pulling force to the receiving cable 2 by controlling the supporting device 12 to be , so that the sag of the receiving cable 2 Keep within the preset threshold , i.e. sag and axial tension In a constant state of adjustment.

[0066] The following table shows the recommended maximum allowable values ​​of the slope of the 2nd slope section of the cable at different speeds. .

[0067] Speed ​​(km / h) Maximum allowable slope 50 2.5 60 2.0 100 0.6 120 0.4 160 0.33 200 0.2 250 0.1

[0068] Example 3

[0069] In this embodiment, in order to further reduce the impact of ice on the power supply system, a current deicing device is provided on the receiving cable 2 in combination with the control device, specifically, by changing the direction and magnitude of the current in the transmission line and utilizing the Joule heat effect generated by the direct current, thereby melting the ice. This can effectively reduce the impact of the ice layer on the power supply system and improve the overall weather resistance of the system. Moreover, on the premise that the ice has been reduced by the receiving cable 2 and the power supply bow 3, the energy consumption required for current deicing can be reduced.

[0070] The present invention has the following characteristics:

[0071] The system sets a power supply arm 7 and a power supply pantograph 3 on a column 6, and sets a power receiving cable 2 along the length of the train on the top of the traction locomotive 1, so as to achieve continuous contact and conduction between the power receiving cable 2 and the power supply pantograph 3 during the movement of the train, thereby ensuring stable power transmission. This design avoids the problem of power supply interruption caused by poor contact or ice accumulation in traditional contact networks.

[0072] The power receiving cable 2 of the present system is equipped with a supporting device 12, which can automatically adjust the angle and position according to the position and speed of the train to ensure accurate docking with the power supply pantograph 3. This adaptive adjustment mechanism further improves the reliability and stability of power supply.

[0073] This system eliminates the contact network that is susceptible to adverse weather conditions such as low temperature, high humidity, strong winds and icing. By optimizing the structural design of the power cable 2 and combining the control device and de-icing device, the impact of ice on the power supply system is effectively reduced, and the overall weather resistance of the system is improved.

[0074] Compared with the traditional complex overhead contact network system, the power supply system of the present invention has a simpler structure, reduces the use of precious metals, and saves engineering investment. At the same time, the system maintenance is more convenient, reducing maintenance costs and manpower investment.

[0075] Improved stability and reliability of the power supply system will help reduce train delays and outages caused by power supply problems, thereby improving the overall operating efficiency of rail transit.

[0076] In summary, in the present invention, the receiving cable 2 is precisely connected with the power supply arm 7 and the power supply pantograph 3, so that the receiving cable 2 and the power supply pantograph 3 can be contacted and connected in turn during the movement of the traction locomotive 1 along the track, thereby realizing continuous transmission of electricity. The solution of using the power supply arm 7 and the power supply pantograph 3 to replace the complex contact network can effectively avoid the impact of extreme weather on the contact network and reduce the workload of later operation maintenance and contact network replacement and update.

[0077] Compared with the traditional overhead contact network, the power supply system of the present invention has a simpler structure, effectively reducing the use of precious metals in the overhead contact network, saving engineering investment, and making maintenance more convenient, thereby reducing maintenance costs and manpower investment. The stability and reliability of the power supply system are improved, which helps to reduce train delays and outages caused by power supply problems and improve the overall operating efficiency of rail transit.

[0078] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

[0079] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present disclosure rather than to limit its protection scope. Although the present disclosure has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that after reading the present disclosure, those skilled in the art can still make various changes, modifications or equivalent substitutions to the specific implementation methods of the invention, but these changes, modifications or equivalent substitutions are all within the protection scope of the disclosed claims to be approved.

Claims

1. An overhead power supply system for electrified rail transit, characterized in that: include: A column, which is used to be set on one side of the track; A power supply pantograph, which is used to be installed on the column; The power receiving cable is used to extend along the length direction of the traction locomotive and is set on the top of the traction locomotive, and is in contact with the power supply pantograph to conduct electricity; the power supply pantograph transmits electricity to the traction locomotive through the power receiving cable.

2. The electrified rail transit overhead power supply system according to claim 1, characterized in that: Fixed points are arranged near both ends of the power receiving cable, and the power receiving cable is fixedly connected to the traction locomotive at the fixed points.

3. The electrified rail transit overhead power supply system according to claim 2, characterized in that: A plurality of supporting devices connected to the power receiving cable are arranged at intervals along the length direction of the power receiving cable between the fixed points at both ends; The supporting device is configured to be able to drive the connection position of the power receiving cable with the supporting device to perform lifting and lowering activities and lateral movement.

4. The electrified rail transit overhead power supply system according to claim 3, characterized in that: Also includes controls: The control device controls the supporting device to apply a lateral pulling force to the power receiving cable. , so that the sag of the receiving cable Stay within the preset threshold; The length of the cable between the two supporting devices is defined as L, and the weight per unit length of the cable is defined as , the offset distance that the supporting device pulls the receiving cable out laterally relative to the center line of the pantograph is defined as , the sag of the cable is ; then the axial tension and lateral tension The calculation is done using the following formula: 。 5. The electrified rail transit overhead power supply system according to claim 4, characterized in that: The portion of the cable from the fixed point to the closest supporting device is defined as the slope section, and the ratio of the vertical envelope range H to the span S of the slope section is defined as the slope value of the slope section. ,Right now: ； The control device adjusts the slope value of the slope section by controlling the support device to raise the height of the power cable. , so that the slope value Not higher than the allowable slope value ; When the running speed of the traction locomotive The higher the slope, the more The smaller.

6. The electrified rail transit overhead power supply system according to claim 5, characterized in that: The threshold is .

7. The electrified rail transit overhead power supply system according to claim 1, characterized in that: A power supply arm is installed on the column; and the power supply bow is installed at the end of the power supply arm.

8. The overhead power supply system for electrified rail transit according to claim 7, characterized in that: It also includes crossarms and feeders; The cross arm is installed on the column; the feeder is installed on the cross arm and is electrically connected to the power supply arm and the power supply bow.

9. The electrified rail transit overhead power supply system according to claim 3, characterized in that: The supporting device comprises: Body; A transverse driving mechanism is arranged on the top of the traction locomotive; the machine body is mounted on the transverse driving mechanism and can be driven by the transverse driving mechanism to move along the width direction of the traction locomotive; The lifting drive mechanism is arranged on the machine body and connected to the power receiving cable, and can drive the connection position of the power receiving cable with the lifting drive mechanism to perform lifting movement.

10. The overhead power supply system for electrified rail transit according to claim 3, characterized in that: Under the lateral pulling force of the supporting device, the power receiving cable forms a zigzag structure on the top of the traction locomotive.

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