Insulated joint for insulated frequency-shift track circuit

Abstract

This invention discloses a non-insulated frequency-shifting track circuit and its insulating joint. The insulating joint includes a resonant unit, a first traction balancing unit, and a second traction balancing unit. The first traction balancing unit, the resonant unit, and the second traction balancing unit are connected in parallel between two adjacent track sections. The first traction balancing unit includes a first inductor and a second capacitor connected in series, and the second traction balancing unit includes a fourth inductor and a third capacitor connected in series. In this solution, the resonant unit prevents the frequency-shifting signal from being transmitted across zones in adjacent track sections, and the two traction balancing units are connected in series to ensure the traction return current balance of the track circuit. Therefore, compared with existing technologies, this solution further optimizes the traction return current balance function. Furthermore, this solution has the advantages of 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 its insulating joint. 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 a non-insulated frequency shift track circuit, which can further optimize the traction return current balance function while ensuring the isolation of different frequency signals between adjacent sections of the non-insulated track circuit; moreover, this solution also 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 uses the insulating joint of the above-mentioned non-insulated frequency shift track circuit.

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

[0008] An insulating joint for a non-insulated frequency shift track circuit includes: a resonant unit, a first traction balancing unit, and a second traction balancing unit;

[0009] The first traction balancing unit, the resonant 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 first inductor and a second capacitor connected in series, and the second traction balancing unit includes a fourth inductor and a third capacitor connected in series.

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

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

[0012] Preferably, the first resonant unit includes a fourth capacitor and a second inductor connected in series.

[0013] Preferably, the second resonant unit includes a fifth capacitor and a third inductor connected in series.

[0014] Preferably, it further includes: a third traction balancing unit and a fourth traction balancing unit;

[0015] The third traction balancing unit, the first traction balancing unit, the first resonant unit, the second resonant unit, the second traction balancing unit, and the fourth traction balancing unit are connected in parallel in the track circuit between two adjacent sections; the third traction balancing unit includes a first capacitor, and the fourth traction balancing unit includes a second capacitor.

[0016] Preferably, the distance between the third traction balancing unit and the second resonant unit or the second traction balancing unit is a first preset distance l1;

[0017] The distance between the fourth traction balance unit and the first traction balance unit or the first resonance unit is a second preset distance l2;

[0018] The distance between the first traction balancing unit and the second resonant unit is a third preset distance l3, or the distance between the first resonant unit and the second traction balancing unit is a third preset distance l3.

[0019] Preferably, the first preset spacing l1 is 10 to 20 m.

[0020] Preferably, the second preset spacing l2 is 10 to 20 m.

[0021] Preferably, the third preset spacing l3 is 5 to 10 m.

[0022] A non-insulated frequency shift track circuit includes: an insulating joint, wherein the insulating joint is an insulating joint for a non-insulated frequency shift track circuit as described above.

[0023] As can be seen from the above technical solution, the insulating joint for the non-insulated frequency shift track circuit provided by the present invention prevents the frequency shift signal of the adjacent track circuit from being transmitted across the zone through a resonant unit, and ensures the traction return current balance of the track circuit through two traction balance units in series resonance. In this way, compared with the prior art, the present solution can further optimize the traction return current balance function; moreover, the present solution also has the characteristics of simple structure, significant effect and easy promotion.

[0024] The present invention also provides a non-insulated frequency shift track circuit. Since the above-mentioned non-insulated frequency shift track circuit uses an insulating joint, it has corresponding beneficial effects, which can be referred to the previous description and will not be repeated here. Attached Figure Description

[0025] 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.

[0026] Figure 1 A schematic diagram of the electrical insulation joint in the existing ZPW-2000A track circuit system;

[0027] Figure 2 This is a schematic diagram of the tuning region of an insulating joint for a non-insulated frequency shift track circuit provided in an embodiment of the present invention.

[0028] Among them, 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 third traction balance unit, 60 is the fourth traction balance unit, 70 is the first port, and 80 is the second port.

[0029] 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

[0030] This patent aims to propose an insulating joint for non-insulated frequency-shifting track circuits. This insulating joint effectively prevents track circuit signals from crossing transmission zones and improves the shunt dead zone problem existing in the current tuning area. Simultaneously, this structure employs a series resonant method for traction current transmission, which reduces the transmission impedance of the traction current and effectively enhances the balance of the traction current between tracks. A dual-channel parallel method is used for traction current transmission; this redundant structural design further reduces the traction current transmission impedance while improving the safety and reliability of traction current transmission.

[0031] 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.

[0032] The insulating joint for non-insulated frequency shift track circuits 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;

[0033] The first traction balancing unit 10, the resonant unit, and the second traction balancing unit 20 are connected in parallel in the track circuit between two adjacent sections. The first traction balancing unit 10 includes a first inductor L1 and a second capacitor C2 connected in series. The second traction balancing unit 20 includes a fourth inductor L4 and a third capacitor C3 connected in series.

[0034] 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 first traction balancing unit 10 and the second traction balancing unit 20 are designed so that they are in series resonance with the traction return signal with an impedance of 0, in order to balance the traction current between the two rails. That is, the two traction balancing units in this scheme use series resonance to ensure traction return balance, which plays a further optimization role compared with the existing technology.

[0035] As can be seen from the above technical solution, in the insulating joint for the non-insulated frequency shift track circuit provided in the embodiment of the present invention, the resonant unit prevents the frequency shift signal of the adjacent track circuit from being transmitted across the zone, and the two traction balance units are used in series resonance to ensure the traction return current balance of the track circuit. In this way, compared with the prior art, the present solution can further optimize the traction return current balance function; moreover, the present solution also has the characteristics of simple structure, significant effect and easy promotion.

[0036] In this plan, such as Figure 2 As shown, the resonant unit includes: a first resonant unit 30 and a second resonant unit 40;

[0037] The first traction balancing unit 10 and the first resonant unit 30, and the second resonant unit 40 and the second traction balancing unit 20 are connected in parallel in the track circuit between two adjacent sections. The first resonant unit 30 is used to prevent damage to its distal section (e.g., ...). Figure 2 The signal from segment B in the middle is transmitted across segments to its nearest segment (such as...). Figure 2 Section A in the middle); the second resonant unit 40 is used to prevent its far-end section (such as Figure 2 The signal of segment A in the middle is transmitted across the segment to its near segment (e.g., Figure 2 Section B in this scheme involves setting two resonant units in the track circuit to prevent signals from different frequencies in adjacent sections from being transmitted across different sections.

[0038] Specifically, such as Figure 2As shown, the first resonant unit 30 includes a fourth capacitor C4 connected in series and a second inductor L2. The first resonant unit 30 in this design is configured 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).

[0039] Furthermore, such as Figure 2 As shown, the second resonant unit 40 includes a fifth capacitor C5 and a third inductor L3 connected in series. Similarly, the second resonant unit 40 in this scheme is designed to facilitate the signal of its far-end segment (such as...) Figure 2 The signal f1 in segment A forms a series resonance with zero impedance, thereby preventing the signal from propagating across the region to its nearest segment (such as...). Figure 2 In section B of the middle.

[0040] Furthermore, such as Figure 2 As shown, the insulating joint for the non-insulated frequency shift track circuit provided in this embodiment of the invention further includes: a third traction balancing unit 50 and a fourth traction balancing unit 60;

[0041] The third traction balancing unit 50, the first traction balancing unit 10, the first resonant unit 30, the second resonant unit 40, the second traction balancing unit 20, and the fourth traction balancing unit 60 are connected in parallel in the track circuit between two adjacent sections. The third traction balancing unit 50 includes a first capacitor C1, and the fourth traction balancing unit 60 includes a second capacitor C2. In this scheme, by adding the third traction balancing unit 50 and the fourth traction balancing unit 60 to both sides of the original insulating joint structure, the traction return current maintaining balance function can be further optimized. Moreover, the resonant unit and traction balancing unit of the insulating joint in this scheme are arranged in such a way that a balanced traction return current is formed on both sides and the signal is isolated in the middle in the track circuit. That is to say, as Figure 2 As shown, in this scheme, the traction balance unit of the insulating joint is distributed on both sides (two sets on each side), and the resonant unit is distributed in the middle. This design helps to avoid the need for tuning section circuit checks and avoids signal interference between adjacent sections.

[0042] Specifically, in order to meet the voltage amplitude enhancement requirement of this section while preventing signal interference from adjacent sections, correspondingly, such as Figure 2As shown, the distance between the third traction balance unit 50 and the second resonant unit 40 or the second traction balance unit 20 is the first preset distance l1; the distance between the fourth traction balance unit 60 and the first traction balance unit 10 or the first resonant unit 30 is the second preset distance l2; the distance between the first traction balance unit 10 and the second resonant unit 40 is the third preset distance l3, or the distance between the first resonant unit 30 and the second traction balance unit 20 is the third preset distance l3.

[0043] Furthermore, in this scheme, the first traction balancing unit 10 controls the signal of its proximal section (such as...). Figure 2 The signal f1 in section A is inductive, equivalent to an inductor. This inductor forms a parallel resonance with the long rail l1 and the first capacitor C1 of the third traction balancing unit to ensure effective transmission of the signal in its near-end section within that section. Additionally, the second traction balancing unit 20 also controls the signal in its near-end section (such as...). Figure 2 The signal f2 in section B is inductive, equivalent to an inductor. This inductor forms a parallel resonance with the long rail l2 and the second capacitor C2 of the fourth traction balance unit 60 to ensure that the signal of its near-end section is effectively transmitted in that section.

[0044] Furthermore, the first preset spacing l1 can be calculated based on the rail parameters. In order to better enhance the signal voltage of this section and avoid signal interference from adjacent sections, the first preset spacing l1 is 10 to 20m, and preferably, the first preset spacing l1 is 13m.

[0045] Furthermore, the second preset spacing l2 can be calculated based on the rail parameters. Similarly, in order to better enhance the signal voltage in this section and avoid signal interference from adjacent sections, the second preset spacing l2 is 10 to 20 m, and preferably 13 m.

[0046] In this scheme, in order to facilitate the balance of the power frequency traction current between the two rails and to help improve the quality factor of the resonant impedance, the third preset spacing l3 is 5 to 10 m.

[0047] 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 track circuit insulating joint described above. Since this solution uses the aforementioned non-insulated frequency-shifting track circuit insulating joint, it has corresponding beneficial effects, which can be referred to the preceding description and will not be repeated here.

[0048] The following will further describe this solution with reference to specific embodiments:

[0049] The purpose of this invention:

[0050] 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.

[0051] Detailed description of the technical solution of this invention:

[0052] Based on the analysis of the existing track circuit insulation joint structure, this patented technical solution is proposed. This patented design ensures the basic functions of the insulation joint, namely preventing signal transmission between different sections and overcoming the problem of dead zones in circuit shunting to a certain extent. Simultaneously, the issue of traction current balance is also included in the insulation joint structure involved in this patent. The insulation 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:

[0053] (1) The insulating joint includes a first unit composed of capacitor C1 (i.e., the third traction balance unit 50), a second unit composed of inductor L1 and capacitor C1 connected in series (i.e., the first traction balance unit 10), a third unit composed of capacitor C4 and inductor L2 connected in series (i.e., the first resonant unit 30), a fourth unit composed of capacitor C5 and inductor L3 connected in series (i.e., the second resonant unit 40), a fifth unit composed of inductor L4 and capacitor C3 connected in series (i.e., the second traction balance unit 20), and a sixth unit composed of capacitor C2 (i.e., the fourth traction balance unit 60).

[0054] The second and third units are connected in parallel, and the fourth and fifth units are connected in parallel. The distance between the first and fourth (fifth) units is l1; the distance between the sixth unit and the second (third) unit is l2; and the distance between the second (third) unit and the fourth (fifth) unit is l3.

[0055] (2) The third unit forms a series resonance with 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 fourth unit forms a series resonance with 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 second and fifth units form a series resonance with the traction return signal with an impedance of 0 to balance the traction current between the two rails.

[0056] (3) The second and third units are inductive to the signal in section A, which is equivalent to an inductor. The inductor, together with the long rail l1 and the capacitor C1 of the first unit, forms a parallel resonance to ensure that the signal in section A is effectively transmitted in this section. The fourth and fifth units are inductive to the signal in section B, which is equivalent to an inductor. The inductor, together with the long rail l2 and the capacitor C2 of the sixth unit, forms a parallel resonance to ensure that the signal in section B is effectively transmitted in this section.

[0057] (4) The first port 70 and the second port 80 are used to connect the transmitting side or receiving side components in the existing track circuit.

[0058] Advantages of this invention:

[0059] 1. By using the third and fourth units to form series resonance for the signals in section B and section A respectively, the impedance is approximately zero, forming a short circuit that effectively prevents signals from adjacent sections from crossing the line, thus ensuring the most basic function of the insulating joint.

[0060] 2. The second and third units together are inductive with respect to the signal in section A, equivalent to an inductor. This inductor forms a parallel resonance with the long rail l1 and the capacitor C1 of the first unit to ensure the effective transmission of the signal in section A in this section. The fourth and fifth units together are inductive with respect to the signal in section B, equivalent to an inductor. This inductor forms a parallel resonance with the long rail l2 and the capacitor C2 of the sixth unit to ensure the effective transmission of the signal in section B in this section.

[0061] 3. As can be seen from the analysis of the technical solution of this patent, the rail section l3 is the signal overlap area of ​​section A and section B. The length of this area is designed to be much shorter than the length of the existing insulating joint, so the problem of dead zone when the train passes through this section can be effectively avoided.

[0062] 4. In this patent, the second and fifth 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. In addition, 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.

[0063] 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.

[0064] 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 a non-insulated frequency-shifting track circuit, characterized in that, include: The resonant unit, the first traction balance unit (10), the second traction balance unit (20), the third traction balance unit (50) and the fourth traction balance unit (60). The resonant unit includes: a first resonant unit (30) and a second resonant unit (40); The third traction balance unit (50), the first traction balance unit (10), the first resonance unit (30), the second resonance unit (40), the second traction balance unit (20), and the fourth traction balance unit (60) are connected in parallel in the track circuit between two adjacent sections. The first traction balancing unit (10) includes a first inductor (L1) and a second capacitor (C2) connected in series. The second traction balancing unit (20) includes a fourth inductor (L4) and a third capacitor (C3) connected in series. The first traction balancing unit (10) and the resonant unit and the second traction balancing unit (20) form a series resonance for the traction return signal, with an impedance of 0, which is used to realize dual-channel redundant traction current balance.

2. The insulating joint for a non-insulated frequency-shifting track circuit according to claim 1, characterized in that, The first resonant unit (30) includes: a fourth capacitor (C4) connected in series and a second inductor (L2).

3. The insulating joint for a non-insulated frequency-shifting track circuit according to claim 1, characterized in that, The second resonant unit (40) includes a fifth capacitor (C5) and a third inductor (L3) connected in series.

4. The insulating joint for a non-insulated frequency-shifting track circuit according to claim 1, characterized in that, The third traction balancing unit (50) includes a first capacitor (C1), and the fourth traction balancing unit (60) includes a second capacitor (C2).

5. The insulating joint for a non-insulated frequency-shifting track circuit according to claim 1, characterized in that, The distance between the third traction balance unit (50) and the second resonance unit (40) or the second traction balance unit (20) is a first preset distance l1; The distance between the fourth traction balance unit (60) and the first traction balance unit (10) or the first resonance unit (30) is a second preset distance l2; The distance between the first traction balance unit (10) and the second resonant unit (40) is a third preset distance l3, or the distance between the first resonant unit (30) and the second traction balance unit (20) is a third preset distance l3.

6. The insulating joint for a non-insulated frequency-shifting track circuit according to claim 5, characterized in that, The first preset spacing l1 is 10~20m.

7. The insulating joint for a non-insulated frequency-shifting track circuit according to claim 5, characterized in that, The second preset spacing l2 is 10~20m.

8. The insulating joint for a non-insulated frequency-shifting track circuit according to claim 5, characterized in that, The third preset spacing l3 is 5~10m.

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

Images