Interval track circuit two-point type tuning device and method

Abstract

The invention provides a two-point type tuning device and method for an interval track circuit, and belongs to the technical field of track circuits, and the two-point type tuning device comprises a first tuning unit, a second tuning unit, a first transformer and a second transformer. The first end of the first transformer is connected with the transmitting end of the tuning area, and the second end of the first transformer is connected with the two ends of the first tuning unit; the first tuning unit and the second tuning unit are connected in series through at least two groups of steel rail impedances; the two ends of the second tuning unit are further connected to the first end of a second transformer, and the second end of the second transformer is connected with the receiving end of the tuning area. By optimizing the arrangement mode of the tuning area and equipment parameters, the number of equipment is reduced, the maintenance workload is reduced, and meanwhile normal work of the track circuit is guaranteed.

Description

Technical Field

[0001] The present invention belongs to the technical field of track circuits, and particularly relates to a two-point tuning device and method for an interval track circuit. Background Art

[0002] The ZPW-2000A non-insulated track circuit, as an important part of the high-speed railway and passenger dedicated line railway signal systems, uses electrical separation of adjacent track circuit signals, and utilizes the different impedance values of tuning units for different frequency signals to achieve isolation of adjacent section signals, delimit the control range of the track circuit, and ensure the safety of railway trains.

[0003] The electrical resonance type non-insulated track circuit uses a capacitor and a part of the inductance of the rail to form a resonance circuit at the boundary of the track circuit. Adjacent track circuits use signal currents of different frequencies to keep adjacent track circuit sections electrically isolated. Therefore, the requirements for the electrical insulation joint are as follows: the parallel resonance impedance of the electrical insulation joint should be large enough to reduce the loss of signals in this section; the series resonance impedance of the electrical insulation joint should be small to ensure the isolation of signals in adjacent sections.

[0004] In the 29m tuning area, it is realized by arranging three-point equipment including tuning unit F1, air-core coil, and tuning unit F2. The existing tuning area maintenance needs to be carried out at three positions, which is time-consuming and has a high labor cost, resulting in low efficiency. Summary of the Invention

[0005] In view of the above problems, the present invention proposes a two-point tuning device and method for an interval track circuit, which solves the problems of being time-consuming and having a high labor cost, and reduces the maintenance workload.

[0006] One aspect of the embodiments of the present application provides a two-point tuning device for an interval track circuit, including:

[0007] A first tuning unit, a second tuning unit, a first transformer, and a second transformer;

[0008] The first end of the first transformer is connected to the sending end of the tuning area, and the second end of the first transformer is connected to both ends of the first tuning unit;

[0009] The first tuning unit and the second tuning unit are connected in series through at least not less than two groups of rail impedances;

[0010] Both ends of the second tuning unit are further connected to the first end of the second transformer, and the second end of the second transformer is connected to the receiving end of the tuning area.

[0011] Preferably, the first tuning unit includes:

[0012] An air-core coil, a first inductor, and a first capacitor;

[0013] The first inductor and the first capacitor are connected in series to form a first branch;

[0014] The air-core coil is connected in parallel with the first branch.

[0015] Preferably, both ends of the air-core coil are connected to the second end of the first transformer;

[0016] The first end of the first inductor is connected to the upper end of the second end of the first transformer;

[0017] The second end of the first capacitor is connected to the lower end of the second end of the first transformer;

[0018] The second end of the first inductor is connected in series with the first end of the first capacitor.

[0019] Preferably, the first tuning unit is arranged in a low-frequency section not higher than 2000HZ.

[0020] Preferably, the first tuning unit is arranged in a low-frequency section of 1700HZ or 2000HZ.

[0021] Preferably, the second tuning unit includes:

[0022] A resonant capacitor, a second inductor, and a second capacitor;

[0023] The second inductor and the second capacitor are connected in series to form a second branch;

[0024] The resonant capacitor is connected in parallel with the second branch.

[0025] Preferably,

[0026] Both ends of the resonant capacitor are connected to the first end of the second transformer;

[0027] The first end of the second inductor is connected to the upper end of the first end of the second transformer;

[0028] The second end of the second capacitor is connected to the lower end of the first end of the second transformer;

[0029] The second end of the second inductor is connected in series with the first end of the second capacitor.

[0030] Preferably, the second tuning unit is arranged in a high-frequency section not lower than 2300HZ.

[0031] Preferably, the second tuning unit is arranged in a high-frequency section of 2300HZ or 2600HZ.

[0032] Based on the same inventive concept, another aspect of the embodiments of the present application further provides a two-point tuning method for an inter-block track circuit, which is applied to a two-point tuning device for an inter-block track circuit, and includes:

[0033] When a neighboring area frequency not higher than 2000HZ passes through the first tuning unit, the first capacitor and the first inductor are in series resonance to form a zero impedance.

[0034] When the frequency of this section passes through the first tuning unit, the first capacitor, the first inductor, the air-core coil and the rail impedance form an extremely high impedance.

[0035] Preferably, when a neighboring area frequency of 1700HZ or 2000HZ passes through the first tuning unit, the first capacitor and the first inductor are in series resonance to form a zero impedance.

[0036] When the frequency of this section passes through the first tuning unit, the first capacitor, the first inductor, the air-core coil and the rail impedance form an extremely high impedance.

[0037] Preferably, when a neighboring area frequency not lower than 2300HZ passes through the second tuning unit, the second capacitor and the second inductor are in series resonance to form a zero impedance.

[0038] When the frequency of this section passes through the second tuning unit, the second capacitor, the second inductor, the resonant capacitor and the rail impedance form an extremely high impedance.

[0039] Preferably, when a neighboring area frequency of 2300HZ or 2600HZ passes through the second tuning unit, the second capacitor and the second inductor are in series resonance to form a zero impedance.

[0040] When the frequency of this section passes through the second tuning unit, the second capacitor, the second inductor, the resonant capacitor and the rail impedance form an extremely high impedance.

[0041] Advantageous effects of the present invention:

[0042] The present disclosure provides a two-point tuning device and method for an inter-block track circuit, including: a first tuning unit, a second tuning unit, a first transformer and a second transformer; a first end of the first transformer is connected to a sending end of a tuning area, and a second end of the first transformer is connected to both ends of the first tuning unit; the first tuning unit and the second tuning unit are connected in series through at least not less than two groups of rail impedances; both ends of the second tuning unit are further connected to a first end of the second transformer, and a second end of the second transformer is connected to a receiving end of the tuning area. And by optimizing the layout mode and equipment parameters of the tuning area, the number of devices is reduced, the maintenance workload is reduced, and the normal operation of the track circuit is ensured at the same time.

[0043] Other features and advantages of the present invention will be set forth in the following description, and in part will be obvious from the description, or may be learned by practice of the present invention. The objectives and other advantages of the present invention may be realized and attained by the structure particularly pointed out in the specification and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following briefly introduces the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0045] Figure 1 FIG. shows a schematic diagram of a two-point tuning device for an interval track circuit;

[0046] Figure 2 FIG. shows a schematic diagram of the structure of a two-point track circuit system;

[0047] Figure 3 FIG. shows a simulation diagram of the shunt residual voltage at the shunt position of two elements;

[0048] Figure 4 FIG. shows a simulation diagram of the locomotive signal current at the shunt position of two elements;

[0049] Figure 5 FIG. shows a simulation diagram of the shunt residual voltage in the tuning section of two elements;

[0050] Figure 6 FIG. shows a schematic diagram of the interface of the tuning unit;

[0051] Figure 7 FIG. shows a schematic diagram of an electronic device in the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0052] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following clearly and completely describes the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.

[0053] It should be noted that the terms "first", "second", etc. in this application are used to distinguish similar objects and do not necessarily describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances so as to implement the embodiments of this application described herein. In this application, the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal", etc. is based on the orientation or positional relationship shown in the drawings.

[0054] In the prior art, a three-point layout method for a 29m tuning area. The tuning area consists of two tuning units (type F1 and type F2) and an air-core coil (SVA), which are respectively arranged at three positions in the tuning area. The F1-type tuning unit is used for the low-frequency sections of 1700Hz and 2000Hz, the F2-type tuning unit is used for the high-frequency sections of 2300Hz and 2600Hz, and the air-core coil (SVA) is used for balancing current and signal transmission. Although this layout method can achieve electrical isolation of adjacent track circuits, the number of devices is large and the maintenance workload is large.

[0055] On the one hand, an embodiment of this application provides a two-point tuning device for an interval track circuit. Refer to Figure 1 , including:

[0056] A first tuning unit, a second tuning unit, a first transformer, and a second transformer;

[0057] The first end of the first transformer is connected to the sending end of the tuning area, and the second end of the first transformer is connected to both ends of the first tuning unit;

[0058] The first tuning unit and the second tuning unit are connected in series through at least no less than two groups of rail impedances;

[0059] Both ends of the second tuning unit are also connected to the first end of the second transformer, and the second end of the second transformer is connected to the receiving end of the tuning area.

[0060] Specifically, Figure 1 shows the two-point tuning device proposed in this application. Different from the three-point layout of the prior art, this application combines the air-core coil (SVA) into the F1-type tuning unit, that is, the first tuning unit, to form a two-point layout method. The tuning area consists of only two tuning matching units (type F1 and type F2), namely the first tuning unit and the second tuning unit, which are respectively arranged at both ends of the tuning area. This layout method reduces the number of devices, simplifies the system structure, and reduces the maintenance workload.

[0061] In some specific embodiments, the first tuning unit includes:

[0062] Air-core coil, first inductor and first capacitor;

[0063] The first inductor and the first capacitor are connected in series to form a first branch;

[0064] The air-core coil is connected in parallel with the first branch.

[0065] Both ends of the air-core coil are connected to the second end of the first transformer;

[0066] The first end of the first inductor is connected to the upper end of the second end of the first transformer;

[0067] The second end of the first capacitor is connected to the lower end of the second end of the first transformer;

[0068] The second end of the first inductor is connected in series with the first end of the first capacitor.

[0069] Specifically, on the basis of the connection relationship inside the first tuning unit, the parameter setting of the first tuning unit is also involved, specifically:

[0070]

[0071] In some specific embodiments, the first tuning unit is set in a low-frequency section not higher than 2000HZ.

[0072] Specifically, the first tuning unit is set in a low-frequency section of 1700HZ or 2000HZ.

[0073] Among them, in the low-frequency sections of 1700Hz and 2000Hz, the F1 type tuning unit is used, that is, the first tuning unit in the technical solution of the present invention. L1 is the first inductor in the F1 type tuning unit, C1 is the first capacitor in the F1 type tuning unit, and Lsva is the large inductor (formed by winding an air-core coil) in the F1 type tuning unit. When the adjacent section frequency passes through the F1 type tuning unit, L1 and C1 are in series resonance to form 0 impedance, preventing the adjacent section signal from entering this section; when the frequency of this section passes through the F1 type tuning unit, L1, C1, LSVA and the 29m steel rail form an extremely high impedance, enabling the signal of this section to be smoothly introduced into this section. In the above formula, L1 is the inductance value of the first inductor, C1 is the value of the first capacitor, L SVA is the inductance value of the air-core coil; L 29钢轨 is the inductance value at the end of the 29-meter steel rail; L 引接线 is the inductance value of the lead wire between the adjacent section and this section.

[0074] The F1 type tuning unit is used in the low-frequency sections of 1700Hz and 2000Hz, and the optimal parameter values of L1, C1 and Lsva are calculated through formulas to ensure the normal operation of the tuning unit in the low-frequency section.

[0075] In some specific embodiments, the second tuning unit includes:

[0076] A resonant capacitor, a second inductor, and a second capacitor;

[0077] The second inductor and the second capacitor are connected in series to form a second branch;

[0078] The resonant capacitor is connected in parallel with the second branch.

[0079] Both ends of the resonant capacitor are connected to the first end of the second transformer;

[0080] The first end of the second inductor is connected to the upper end of the first end of the second transformer;

[0081] The second end of the second capacitor is connected to the lower end of the first end of the second transformer;

[0082] The second end of the second inductor is connected in series with the first end of the second capacitor.

[0083] Specifically, on the basis of the internal connection relationship of the second tuning unit, the parameter setting of the second tuning unit is also involved, specifically:

[0084]

[0085] In some specific embodiments, the second tuning unit is set in a high-frequency section not lower than 2300HZ.

[0086] Specifically, the second tuning unit is set in a high-frequency section of 2300HZ or 2600HZ.

[0087] Among them, in the high-frequency sections of 2300Hz and 2600Hz, the F2 type tuning unit is used, that is, the second tuning unit in the technical solution of the present invention. L2 is the second inductor in the F2 type tuning unit, C2 is the second capacitor in the F2 type tuning unit, and C3 is the tuning capacitor in the F2 type tuning unit. When the adjacent section frequency passes through the F2 type tuning unit, L2 and C2 are in series resonance to form 0 impedance, preventing the adjacent section signal from entering this section; when the frequency of this section passes through the F2 type tuning unit, L2, C2, C3 and the 29m steel rail form an extremely high impedance, allowing the signal of this section to be smoothly transmitted into this section. In the above formula, L2 is the inductance value of the second inductor, C2 is the value of the second capacitor, L 引接线 is the inductance value of the lead wire between the adjacent section and this section; L 29钢轨 is the inductance value at the end of the 29-meter steel rail.

[0088] In some specific embodiments, the first tuning unit is arranged in the low-frequency section of 1700HZ or 2000HZ; the second tuning unit is arranged in the high-frequency section of 2300HZ or 2600HZ.

[0089] Based on the same inventive concept, on the other hand, an embodiment of the present application further provides a two-point tuning method for an interval track circuit, which is applied to a two-point tuning device for an interval track circuit, and includes:

[0090] When the adjacent area frequency not higher than 2000HZ passes through the first tuning unit, the first capacitor and the first inductor are in series resonance to form a zero impedance;

[0091] When the frequency of this section passes through the first tuning unit, the first capacitor, the first inductor, the air-core coil and the rail impedance form an extreme impedance.

[0092] In some specific embodiments, when the adjacent area frequency of 1700HZ or 2000HZ passes through the first tuning unit, the first capacitor and the first inductor are in series resonance to form a zero impedance;

[0093] When the frequency of this section passes through the first tuning unit, the first capacitor, the first inductor, the air-core coil and the rail impedance form an extreme impedance.

[0094] In some specific embodiments, when the adjacent area frequency not lower than 2300HZ passes through the second tuning unit, the second capacitor and the second inductor are in series resonance to form a zero impedance;

[0095] When the frequency of this section passes through the second tuning unit, the second capacitor, the second inductor, the resonant capacitor and the rail impedance form an extreme impedance.

[0096] In some specific embodiments, when the adjacent area frequency of 2300HZ or 2600HZ passes through the second tuning unit, the second capacitor and the second inductor are in series resonance to form a zero impedance;

[0097] When the frequency of this section passes through the second tuning unit, the second capacitor, the second inductor, the resonant capacitor and the rail impedance form an extreme impedance.

[0098] The following will make a detailed description of the application of a two-point tuning device for an interval track circuit in the track circuit system in the present application.

[0099] See Figure 2, this application is applied to a 29-meter track tuning section. The track circuit signal is sent from the indoor sending channel of this section, passes through the outdoor tuning matching unit, the rail, and then the outdoor tuning matching unit, and finally returns to the indoor receiving channel. Since the tuning matching unit F1 of this section has an extremely high impedance to the signal frequency of this section, most of the signals can be received by this section; since the tuning matching unit F2 of the adjacent section has a zero impedance to the signal of this section, only a small part of the signal is received through the adjacent section.

[0100] Figure 2 It shows the overall structure diagram of the two-point track circuit system. The figure shows the transmission path of the track circuit signal: the signal is sent from the indoor sending channel, passes through the outdoor tuning matching unit (type F1 or F2), the rail, and then returns to the indoor receiving channel through another tuning matching unit. The F1 type tuning unit has an extremely high impedance to the signal frequency of this section, ensuring the smooth transmission of the signal; the F2 type tuning unit has a zero impedance to the signal frequency of the adjacent section, preventing the signal from interfering with the adjacent section.

[0101] The following explains that this application can meet the existing electrical transmission requirements by comparing the electrical characteristics of the two-point tuning method and the three-point tuning method.

[0102] Demonstrate the transmission characteristics of the three-point and two-point tuning areas through simulation calculations:

[0103]

[0104] Through simulation analysis, it can be obtained that by selecting an appropriate inductance value of the air-core coil, the transmission characteristics of the two-point and three-point methods are similar. Therefore, the layout method of the two-point tuning area can be realized.

[0105] The following combines the instructions Figures 3 to 5 for comparison to explain the transmission characteristics of the system.

[0106] From Figure 3 it can be seen that the shunt residual voltage simulation results of the two-point tuning area. By simulating and analyzing the shunt residual voltage of the two-point tuning area, the results show that the shunt residual voltage is less than 153 mV, meeting the shunt requirements of the track circuit. This indicates that the two-point tuning area is comparable to the three-point tuning area in terms of shunt performance and can reliably realize the shunt function of the track circuit.

[0107] From Figure 4 it can be seen that the locomotive signal current simulation results of the two-point tuning area. By simulating and analyzing the locomotive signal current of the two-point tuning area, the results show that the locomotive signal current is greater than 0.5 A (greater than 0.45 A at 2600 Hz), meeting the locomotive shunt requirements. This indicates that the two-point tuning area is comparable to the three-point tuning area in terms of locomotive signal transmission performance and can ensure the normal reception of locomotive signals.

[0108] FromFigure 5 It can be seen that the shunt dead zone in the two-point tuning area is analyzed through simulation, and the results show that there is a shunt dead zone in the tuning area. The shunt dead zone refers to the area where the shunting effect of the track circuit is poor, which may lead to unstable signal transmission. The specific position and range of the shunt dead zone are marked in the figure, providing a reference for subsequent optimization.

[0109] In another embodiment of the present application, a schematic diagram of the interface of the coordination unit is also provided.

[0110] See Figure 6 , this figure is a schematic diagram of the physical interface of the tuning unit. The tuning matching unit is composed of a combination of a tuning unit and a matching transformer. One end of the tuning matching unit is connected to indoor equipment (transmission or reception channel), and the other end is connected to both ends of the rail through a rail lead wire.

[0111] It should be noted that the original three-point tuning area within 29m contains 2 tuning matching units and 1 air-core coil, and maintenance and testing need to be carried out at 3 outdoor locations; now the two-point tuning area within 29m only contains 2 tuning matching units, and maintenance and testing need to be carried out at 2 outdoor locations, which can save workload and component costs, and thus improve convenience and economy.

[0112] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present application.

Claims

1. A two-point tuning device for an interval track circuit, characterized in that Comprising: A first tuning unit, a second tuning unit, a first transformer, and a second transformer; The first end of the first transformer is connected to the sending end of the tuning area, and the second end of the first transformer is connected to both ends of the first tuning unit; The first tuning unit and the second tuning unit are connected in series by at least not less than two groups of rail impedances; Both ends of the second tuning unit are also connected to the first end of the second transformer, and the second end of the second transformer is connected to the receiving end of the tuning area.

2. The device according to claim 1, characterized in that The first tuning unit includes: An air-core coil, a first inductor, and a first capacitor; The first inductor and the first capacitor are connected in series to form a first branch; The air-core coil is connected in parallel with the first branch.

3. The device according to claim 2, wherein: Both ends of the air-core coil are connected to the second end of the first transformer; The first end of the first inductor is connected to the upper end of the second end of the first transformer; The second end of the first capacitor is connected to the lower end of the second end of the first transformer; The second end of the first inductor is connected in series with the first end of the first capacitor.

4. The device according to claim 3, wherein: The first tuning unit is arranged in a low-frequency section not higher than 2000HZ.

5. The device according to claim 4, wherein: The first tuning unit is arranged in a low-frequency section of 1700HZ or 2000HZ.

6. The device according to claim 1, characterized in that, The second tuning unit includes: A resonant capacitor, a second inductor, and a second capacitor; The second inductor and the second capacitor are connected in series to form a second branch; The resonant capacitor is connected in parallel with the second branch.

7. The device according to claim 6, wherein: Both ends of the resonant capacitor are connected to the first end of the second transformer; The first end of the second inductor is connected to the upper end of the first end of the second transformer; The second end of the second capacitor is connected to the lower end of the first end of the second transformer; The second end of the second inductor is connected in series with the first end of the second capacitor.

8. The device according to claim 6, wherein: The second tuning unit is arranged in a high-frequency section not lower than 2300HZ.

9. The device according to claim 8, wherein: The second tuning unit is arranged in a high-frequency section of 2300HZ or 2600HZ.

10. A two-point tuning method for an interval track circuit, applied to a two-point tuning device for an interval track circuit according to any one of claims 1 to 9, characterized in that, Comprising: When the adjacent area frequency not higher than 2000HZ passes through the first tuning unit, the first capacitor and the first inductor are in series resonance to form zero impedance; When the frequency of this section passes through the first tuning unit, the first capacitor, the first inductor, the air-core coil, and the rail impedance form an extremely high impedance.

11. The method according to claim 10, wherein Comprising: When the adjacent area frequency of 1700HZ or 2000HZ passes through the first tuning unit, the first capacitor and the first inductor are in series resonance to form zero impedance; When the frequency of this section passes through the first tuning unit, the first capacitor, the first inductor, the air-core coil, and the rail impedance form an extremely high impedance.

12. The method according to claim 10, wherein Comprising: When the adjacent area frequency not lower than 2300HZ passes through the second tuning unit, the second capacitor and the second inductor are in series resonance to form zero impedance; When the frequency of this section passes through the second tuning unit, the second capacitor, the second inductor, the resonant capacitor and the rail impedance form an extreme impedance.

13. The method according to claim 12, characterized in that, Including: When the adjacent area frequency of 2300HZ or 2600HZ passes through the second tuning unit, the second capacitor and the second inductor are in series resonance to form a zero impedance; When the frequency of this section passes through the second tuning unit, the second capacitor, the second inductor, the resonant capacitor and the rail impedance form an extreme impedance.

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