Insulated joint for automatic block of insulated frequency shift track circuit

Abstract

This invention discloses a non-insulated frequency-shifting track circuit and its automatic blocking insulating joint. The non-insulated frequency-shifting automatic blocking insulating joint includes a resonant unit, a first traction balancing unit, and a second traction balancing unit. The resonant unit, the first traction balancing unit, and the second traction balancing unit are connected in parallel in the track circuit between two adjacent sections. The first traction balancing unit includes a second capacitor and a second inductor connected in series, and the second traction balancing unit includes a third capacitor and a third inductor connected in series. In this solution, the resonant unit prevents the frequency-shifting signal from crossing zones in adjacent track circuit sections, and the traction balancing units balance the traction return current between the two rails. Furthermore, the use of two traction balancing units further optimizes the traction return current balancing function. This solution also features a simple structure, significant effect, and ease of promotion.

Description

Technical Field

[0001] This invention relates to the field of track circuit technology, and in particular to a non-insulated frequency shift track circuit and an insulating joint for automatic blocking. Background Technology

[0002] Insulating joints in uninsulated track circuits can be used to achieve electrical isolation between adjacent track circuits, ensure smooth signal transmission in the same section, and maintain a balanced traction return current. Therefore, they are a very important component of uninsulated track circuits.

[0003] The ZPW-2000A track circuit system is widely used in the domestic railway signaling field. Its main function is to check the occupancy and vacancy status of rail sections, effectively maintaining the stability, safety, and reliability of railway operations. As one of the most advanced automatic block systems currently available, the ZPW-2000A track circuit system primarily achieves electrical isolation of track circuit signals between adjacent sections through electrical insulation joints. Therefore, the electrical insulation joint plays a crucial role in this system. A schematic diagram of the existing electrical insulation joint structure in the ZPW-2000A track circuit system is shown below. Figure 1 As shown. At port 1, capacitor C1 and inductor L1 form a two-element system that resonates in series with signal f2 in section B, resulting in approximately zero impedance and a short-circuit effect, preventing its transmission to section A. Simultaneously, this circuit exhibits capacitive resistance to signal f1 in section A and resonates in parallel with the inductance formed by the long rail and the hollow coil SVA, exhibiting high impedance and contributing to increasing the voltage at port 1. At port 2, C2, C3, and L2 form a three-element structure. C2 and L2 resonate in series with signal f1 in section A, resulting in approximately zero impedance, effectively preventing the signal from transmitting to section B. This three-element structure also exhibits capacitive resistance to signal f2 in section B and resonates in parallel with the inductance formed by the long rail and the hollow coil SVA, exhibiting high impedance and contributing to increasing the voltage at port 2. As can be seen from the above, the hollow coil SVA plays a significant role in the insulation joint structure. Furthermore, SVA exhibits low resistance to traction current, helping to balance the traction current between the two rails. Generally, the length l of the insulation joint is approximately 29m.

[0004] Long-term application has revealed that this type of insulation joint has a design flaw that results in a dead zone. When a train enters the insulation joint, effective circuit checking cannot be performed, and the track circuit system judges the rail as idle. This dead zone can escalate faults and should be avoided at all costs. In fact, there is currently no good solution for this dead zone. Furthermore, due to the requirements for increased train speeds or the presence of large traction currents in heavy-load lines, a large current imbalance in the rails will flow through the air-core coil SVA. While the SVA exhibits low resistance to traction current, a certain resistance still leads to a significant voltage difference across it. This traction current can then interfere with the track circuit system. Additionally, the large traction current flowing through the SVA places higher demands on the air-core coil's withstand capability, accelerating damage and ultimately causing failure. Therefore, it is necessary to propose a new insulation joint structure design to completely resolve the design flaws of the current insulation joint and eliminate the safety hazards to the track circuit system caused by it. Summary of the Invention

[0005] In view of this, the present invention provides an insulating joint for non-insulated frequency-shifting automatic block signaling, which can not only ensure the isolation signal function of adjacent sections of non-insulated track circuits, but also further optimize the traction return current balance function. Moreover, it has the characteristics of simple structure, significant effect and easy promotion.

[0006] The present invention also provides a non-insulated frequency shift track circuit that utilizes the aforementioned insulating joint.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] An insulating joint for non-insulated frequency-shifting automatic block signaling includes: a resonant unit and a first traction balancing unit and a second traction balancing unit;

[0009] The resonant unit, the first traction balancing unit, and the second traction balancing unit are connected in parallel in the track circuit between two adjacent sections. The first traction balancing unit includes a second capacitor and a second inductor connected in series, and the second traction balancing unit includes a third capacitor and a third inductor connected in series.

[0010] Preferably, the resonant unit includes: a first resonant unit and a second resonant unit;

[0011] The first resonant unit, the first traction balance unit, the second traction balance unit, and the second resonant unit are connected in parallel in the track circuit between two adjacent sections.

[0012] Preferably, the distance between the first resonant unit and the second resonant unit is a preset resonant distance l1.

[0013] Preferably, the preset resonant spacing l1 is 18 to 30 m.

[0014] Preferably, the distance between the first traction balancing unit and the second traction balancing unit is a preset traction balancing distance l2, and the distance between the first resonant unit and the first traction balancing unit is equal to the distance between the second traction balancing unit and the second resonant unit.

[0015] Preferably, the preset traction balance distance l2 is 5 to 10 m.

[0016] Preferably, the first resonant unit includes: a first inductor, a first capacitor and a sixth capacitor, wherein the first capacitor is connected in series with the first inductor and then connected in parallel with the sixth capacitor.

[0017] Preferably, the second resonant unit includes a fourth inductor, a fourth capacitor, and a fifth capacitor, wherein the fourth capacitor is connected in series with the fourth inductor and then in parallel with the fifth capacitor.

[0018] Preferably, it further includes: a first port and a second port;

[0019] The first end of the first port is connected to the first traction balancing unit, the first end of the second port is connected to the second traction balancing unit, one of the second ends of the first port and the second end of the second port is used to connect to the transmitting side unit of the track circuit, and the other is used to connect to the receiving side unit of the track circuit.

[0020] A non-insulated frequency shift track circuit includes: an insulating joint, wherein the insulating joint is the non-insulated frequency shift automatic blocking insulating joint described above.

[0021] As can be seen from the above technical solutions, the insulating joint for automatic blocking without insulation frequency shift provided in the embodiments of the present invention uses a resonant unit to prevent the frequency shift signal of the track circuit in adjacent sections from being transmitted across zones, and a traction balancing unit to balance the traction return current between the two rails. Moreover, there are two traction balancing units. In this way, the traction return current maintaining balance function can be further optimized. Furthermore, this solution also has the characteristics of simple structure, significant effect and easy promotion.

[0022] The present invention also provides a non-insulated frequency shift track circuit. Since it uses the above-mentioned non-insulated frequency shift automatic blocking insulating joint, it has corresponding beneficial effects, which can be referred to the previous description and will not be repeated here. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the existing electrical insulation joint in the ZPW-2000A track circuit system.

[0025] Figure 2 This is a schematic diagram of the tuning region of a non-insulated frequency shift track circuit provided in an embodiment of the present invention.

[0026] Wherein, 10 is the first traction balance unit, 20 is the second traction balance unit, 30 is the first resonant unit, 40 is the second resonant unit, 50 is the first port, and 60 is the second port;

[0027] L1 is the first inductor, L2 is the second inductor, L3 is the third inductor, L4 is the fourth inductor, C1 is the first capacitor, C2 is the second capacitor, C3 is the third capacitor, C4 is the fourth capacitor, C5 is the fifth capacitor, and C6 is the sixth capacitor. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] The insulating joint for automatic frequency shift blocking provided in this embodiment of the invention, such as... Figure 2 As shown, it includes: a resonant unit, a first traction balance unit 10, and a second traction balance unit 20;

[0030] The resonant unit, the first traction balancing unit 10 and the second traction balancing unit 20 are connected in parallel in the track circuit between two adjacent sections, and the first traction balancing unit 10 includes: a second capacitor C2 and a second inductor L2 connected in series, and the second traction balancing unit 20 includes: a third capacitor C3 and a third inductor L3 connected in series.

[0031] In this scheme, it should be noted that the resonant unit is used to prevent cross-regional transmission of track circuit signals of different frequencies in adjacent sections; in addition, the traction balancing unit is designed so that it has zero impedance to the traction return signal to balance the traction current between the two rails; moreover, there are two traction balancing units, namely the first traction balancing unit 10 and the second traction balancing unit 20, so as to further optimize the traction return and balance function.

[0032] As can be seen from the above technical solutions, the insulating joint for automatic blocking without insulation frequency shift provided in the embodiments of the present invention uses a resonant unit to prevent the frequency shift signal of the track circuit in adjacent sections from being transmitted across zones, and a traction balancing unit to balance the traction return current between the two rails. Moreover, there are two traction balancing units. In this way, the traction return current maintaining balance function can be further optimized. Furthermore, this solution also has the characteristics of simple structure, significant effect and easy promotion.

[0033] In this plan, such as Figure 2 As shown, the resonant unit includes: a first resonant unit 30 and a second resonant unit 40;

[0034] The first resonant unit 30, the first traction balancing unit 10, the second traction balancing unit 20, and the second resonant unit 40 are connected in parallel in the track circuit between two adjacent sections. The first traction balancing unit 10 and the second traction balancing unit 20 are both located between the first resonant unit 30 and the second resonant unit 40. This means that in this design, the first resonant unit 30 and the second resonant unit 40 are respectively located on both sides of the track circuit between two adjacent sections. This design prevents signals from different frequencies in the track circuits of adjacent sections from being transmitted across zones, thus ensuring good isolation of the insulating joint.

[0035] Furthermore, to avoid attenuation of signals of different frequencies in two adjacent segments within the track circuit, and to ensure effective transmission of signals of different frequencies in two adjacent segments within the track circuit, the spacing between the first resonant unit 30 and the second resonant unit 40 should not be too large or too small; correspondingly, such as Figure 2 As shown, the distance between the first resonant unit 30 and the second resonant unit 40 is a preset resonant distance l1.

[0036] Furthermore, in order to better achieve the above two effects, as a preferred option, the preset resonant spacing l1 is 18 to 30 m.

[0037] Specifically, such as Figure 2As shown, in order to better optimize the traction return current balancing function, the distance between the first traction balancing unit 10 and the second traction balancing unit 20 should not be too large or too small; correspondingly, the distance between the first traction balancing unit 10 and the second traction balancing unit 20 is a preset traction balancing distance l2; in order to achieve balanced optimization of the traction return current balancing function, the distance between the first resonant unit 30 and the first traction balancing unit 10 is equal to the distance between the second traction balancing unit 20 and the second resonant unit 40.

[0038] Furthermore, in order to achieve a better optimization effect in maintaining the balance of traction return flow, the preset traction balance distance l2 is 5 to 10 m.

[0039] In this plan, such as Figure 2 As shown, the first resonant unit 30 includes: a first inductor L1, a first capacitor C1, and a sixth capacitor C6, wherein the first capacitor C1 is connected in series with the first inductor L1 and then in parallel with the sixth capacitor C6. The first resonant unit 30 in this scheme is designed in this way to facilitate the signal in its far-end segment (such as...) Figure 2 The signal f2 in section B forms a series resonance with an impedance of 0, thereby preventing the signal from propagating across the region to its near-end section (such as...). Figure 2 In section A); furthermore, the first resonant unit 30 controls the signal of its proximal section (such as... Figure 2 The signal f1) in section A is capacitive, equivalent to a capacitor. This capacitor forms a parallel resonance with the long rail l1, the first traction balance unit 10 and the second traction balance unit 20 to ensure the effective transmission of the signal in the near-end section of the track circuit.

[0040] Furthermore, such as Figure 2 As shown, the second resonant unit 40 includes a fourth inductor L4, a fourth capacitor C4, and a fifth capacitor C5, with the fourth capacitor C4 connected in series with the fourth inductor L4 and then connected in parallel with the fifth capacitor C5. Similarly, the second resonant unit 40 in this scheme is designed in this way to facilitate the signal in its far-end segment (such as...) Figure 2 The signal f1 in section A forms a series resonance with zero impedance, thereby preventing the signal from crossing the line and propagating to its near-end section (such as...). Figure 2 In section B); in addition, the second resonant unit 40 affects the signal of its proximal section (such as... Figure 2 The signal f2) in section B is capacitive, equivalent to a capacitor. This capacitor forms a parallel resonance with the long rail l1, the first traction balance unit 10 and the second traction balance unit 20 to ensure the effective transmission of the signal in the near-end section of the track circuit.

[0041] Furthermore, such as Figure 2As shown, the insulating joint for automatic frequency shift blocking without insulation provided in this embodiment of the invention further includes: a first port 50 and a second port 60;

[0042] The first end of the first port 50 is connected to the first traction balancing unit 10, and the first end of the second port 60 is connected to the second traction balancing unit 20. One of the second ends of the first port 50 and the second end of the second port 60 is used to connect to the transmitting side unit of the track circuit, and the other is used to connect to the receiving side unit of the track circuit. This corresponds to the first port 50 and the second port 60 of the insulating joint in this scheme, one used to connect to the transmitting side unit of the track circuit, and the other used to connect to the receiving side unit of the track circuit. This design allows the insulating joint to combine the transmitting side unit and the receiving side unit of the track circuit, thereby effectively solving the problem of dead zones in current track circuits.

[0043] This invention also provides a non-insulated frequency-shifting track circuit, comprising: an insulating joint, wherein the insulating joint is the non-insulated frequency-shifting automatic blocking insulating joint described above. Since this solution uses the aforementioned non-insulated frequency-shifting automatic blocking insulating joint, it possesses corresponding beneficial effects, as detailed above, which will not be repeated here.

[0044] The following will further describe this solution with reference to specific embodiments:

[0045] The purpose of this invention:

[0046] Based on the current requirements for insulating joints in track circuits, this solution proposes a new type of insulating joint. This insulating joint can prevent the cross-regional transmission of frequency shift signals in adjacent track circuit sections, while also meeting the requirements for balancing the traction current between the two rails. Moreover, this insulating joint has a simple structure and significant effects.

[0047] Detailed description of the technical solution of this invention:

[0048] The insulating joint designed in this invention is used to isolate track circuit signals of different frequencies in adjacent sections, such as... Figure 2 The specific details of f1 and f2 for segments A and B shown in the figure are as follows:

[0049] (1) The insulating joint includes a first unit (i.e., the first resonant unit 30) consisting of an inductor L1 and a capacitor C1 connected in series and in parallel with a capacitor C6, a second unit (i.e., the first traction balance unit 10) consisting of an inductor L2 and a capacitor C2 connected in series, a third unit (i.e., the second traction balance unit 20) consisting of an inductor L3 and a capacitor C3 connected in series, and a fourth unit (i.e., the second resonant unit 40) consisting of a capacitor C4 and an inductor L4 connected in series and in parallel with a capacitor C5.

[0050] The distance between the first unit and the fourth unit is l1; the distance between the second unit and the third unit is l2;

[0051] (2) The fourth unit forms a series resonance for the signal f1 in section A with an impedance of 0 to prevent the signal from being transmitted to section B across the section; the first unit forms a series resonance for the signal f2 in section B with an impedance of 0 to prevent the signal from being transmitted to section A across the section; the second and third units have zero impedance to the traction return signal to balance the traction current between the two rails.

[0052] (3) The first unit is capacitive for the signal in section A, which is equivalent to a capacitor. The capacitor forms a parallel resonance with the long rail l1 and the second and third units to ensure the effective transmission of the signal in section A in this section. The fourth unit is capacitive for the signal in section B. The capacitor forms a parallel resonance with the long rail l1 and the second and third units to ensure the effective transmission of the signal in section B in this section.

[0053] (4) Port 1 and Port 2 are used to connect to the transmitting or receiving components in the existing track circuit.

[0054] Advantages of this invention:

[0055] 1. This structural design ensures the basic function of the insulating joint, namely, preventing signal transmission between adjacent sections.

[0056] 2. The first unit is a three-element structure. In this structure, the series structure formed by C1 and L1 is capacitive for the signal in section A, with an equivalent capacitance of C. When further connected in parallel with C6, the design parameters can be designed so that C = C6. In this case, the quality factor of the final parallel capacitor is higher, and a higher impedance can be obtained when resonating in parallel with the rail, etc., while the signal quality is also higher.

[0057] 3. In this insulation joint design, port 1 and port 2 are connected in series at the second and third units respectively, which can effectively reduce the dead zone length of the branch circuit;

[0058] 4. In this patent, the second and third units are series resonant for the traction return current, with an impedance of approximately zero. Compared to a simple air-core coil, this more effectively reduces the impedance of the traction current transmission channel and enhances the balance of inter-rail traction current. Furthermore, the dual-channel parallel structure design further reduces the impedance of the inter-rail traction current transmission channel. Additionally, this structure provides dual-channel redundancy for the traction current; if one channel fails, the other channel can still function, improving system safety and reliability.

[0059] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0060] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An insulating joint for non-insulated frequency-shifting automatic blocking, characterized in that, include: The resonant unit and the first traction balance unit (10) and the second traction balance unit (20); The resonant unit, the first traction balance unit (10) and the second traction balance unit (20) are connected in parallel in the track circuit between two adjacent sections, and the first traction balance unit (10) includes: a second capacitor (C2) and a second inductor (L2) connected in series, and the second traction balance unit (20) includes: a third capacitor (C3) and a third inductor (L3) connected in series. The first traction balance unit (10) and the resonant unit form a series resonance with the second traction balance unit (20) for the traction return signal, with an impedance of 0, which is used to realize the dual-channel redundant traction current balance; The resonant unit includes: a first resonant unit (30) and a second resonant unit (40); The first resonant unit (30), the first traction balance unit (10), the second traction balance unit (20) and the second resonant unit (40) are connected in parallel in the track circuit between two adjacent sections.

2. The insulating joint for non-insulated frequency-shifting automatic blocking according to claim 1, characterized in that, The distance between the first resonant unit (30) and the second resonant unit (40) is a preset resonant distance l1.

3. The insulating joint for non-insulated frequency-shifting automatic blocking according to claim 2, characterized in that, The preset resonant spacing l1 is 18~30m.

4. The insulating joint for non-insulated frequency-shifting automatic blocking according to claim 1, characterized in that, The distance between the first traction balance unit (10) and the second traction balance unit (20) is a preset traction balance distance l2, and the distance between the first resonant unit (30) and the first traction balance unit (10) is equal to the distance between the second traction balance unit (20) and the second resonant unit (40).

5. The insulating joint for non-insulated frequency-shifting automatic blocking according to claim 4, characterized in that, The preset traction balance distance l2 is 5~10m.

6. The insulating joint for non-insulated frequency-shifting automatic blocking according to claim 1, characterized in that, The first resonant unit (30) includes a first inductor (L1), a first capacitor (C1) and a sixth capacitor (C6), wherein the first capacitor (C1) is connected in series with the first inductor (L1) and then connected in parallel with the sixth capacitor (C6).

7. The insulating joint for non-insulated frequency shifting automatic blocking according to claim 1, characterized in that, The second resonant unit (40) includes a fourth inductor (L4), a fourth capacitor (C4), and a fifth capacitor (C5), wherein the fourth capacitor (C4) is connected in series with the fourth inductor (L4) and then connected in parallel with the fifth capacitor (C5).

8. The insulating joint for non-insulated frequency-shifting automatic block according to claim 1, characterized in that, Also includes: First port (50) and second port (60); The first end of the first port (50) is connected to the first traction balancing unit (10), the first end of the second port (60) is connected to the second traction balancing unit (20), one of the second ends of the first port (50) and the second end of the second port (60) is used to connect to the transmitting side unit of the track circuit, and the other is used to connect to the receiving side unit of the track circuit.

9. A non-insulated frequency shift track circuit, comprising: An insulating joint, characterized in that the insulating joint is an insulating joint for automatic frequency shift blocking as described in any one of claims 1-8.

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