Tuning circuit and track circuit tuning equipment

Abstract

The utility model discloses a tuning circuit and a track circuit tuning device, the tuning circuit comprises a first inductor, a first capacitor, a second capacitor and a second inductor, the first inductor, the second capacitor and the second inductor are sequentially connected in series, and the first inductor and the second capacitor are connected in series and then are connected with the first capacitor in parallel; wherein the second inductor is an adjustable inductor. By arranging an adjustable inductor in the tuning circuit, continuous adjustment of the overall capacitance value of the tuning equipment is realized.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of track circuit, especially relates to a tuning circuit and track circuit tuning equipment. BACKGROUND

[0002] The existing track circuit is an electric circuit composed of two steel rails of railway line as conductor and connecting signal power supply and receiving equipment with lead-in wire, and the track line is divided into multiple sections by mechanical insulation joint or electrical insulation joint, and the idle / occupied information is transmitted to the interlocking system to ensure the safety of train operation. Further, the track circuit is composed of indoor equipment and outdoor equipment, the indoor equipment includes sending equipment, amplification filtering equipment, resistance matching equipment, lightning protection module, direction conversion equipment, demodulation equipment, receiving equipment, relay and the like, and the outdoor equipment includes tuning equipment and conversion equipment. The tuning equipment is a kind of trackside equipment, which can realize the transmission of the signal of the section and the effective isolation of the signal of the adjacent section.

[0003] The existing track circuit tuning equipment is composed of inductor, capacitor and transformer. By selecting inductor and capacitor devices with different parameters, the tuning equipment and the inductance of steel rail and lead-in wire form parallel resonance, the impedance of the tuning equipment on the steel rail side reaches the maximum, so that the signal of the section can be transmitted to the receiving equipment through the steel rail, and the transformer is used to realize the matching connection of the impedance of the steel rail and the impedance of the cable. The device parameters of each type of tuning equipment are fixed, and only suitable for specific section and adjacent section frequency combination, when the frequency of the adjacent section changes, the resonance point cannot be changed by adjusting the device parameters, thereby limiting the application range of the tuning equipment.

[0004] Therefore, how to provide a tuning equipment with stronger applicability has become an urgent technical problem to be solved. SUMMARY

[0005] In view of the above problems, the utility model provides a tuning circuit and track circuit tuning equipment, the tuning circuit has wide application range and high reliability.

[0006] The utility model discloses a tuning circuit, including first inductor, first electric capacity, second electric capacity and second inductor, first inductor, second electric capacity and second inductor are connected in series in proper order, and first inductor and second electric capacity are connected in parallel with first electric capacity after being connected in series;Among them,

[0007] The second inductor is an adjustable inductor.

[0008] Further, one end of the first inductor is connected with a first lead-out terminal, one end of the second inductor is connected with a second lead-out terminal, and the other end is connected with a third lead-out terminal.

[0009] The first, second and third lead-out terminals are located on the rail side, the first and third lead-out terminals are connected with the rail respectively, and the second lead-out terminal is a reserved terminal.

[0010] Further, the second inductor comprises a skeleton, a magnetic core and a winding, the magnetic core and the winding are arranged on the skeleton, wherein,

[0011] The magnetic core and the winding are movably connected.

[0012] Further, the magnetic core adopts a threaded soft magnetic ferrite core.

[0013] Another purpose of the utility model is to provide a kind of track circuit tuning equipment, including the tuning circuit and matching circuit described above, and the tuning circuit is connected with matching circuit.

[0014] Further, the matching circuit comprises a third inductor, a third capacitor, a first transformer and a second transformer, wherein,

[0015] One end of the third inductor is connected with the other end of the second inductor, the other end is connected with one end of the third capacitor, the other end of the third capacitor is connected with the first side of the first transformer, the first side of the first transformer is also connected with one end of the first inductor, the second side of the first transformer is connected with the first side of the second transformer, and the second sides of the first transformer and the second transformer are located on the equipment side and are connected with corresponding equipment respectively.

[0016] Further, it further comprises a printed board and a plurality of lead-out terminals, the first inductor, the first capacitor, the second capacitor, the second inductor, the third inductor, the third capacitor, the first transformer, the second transformer and the plurality of lead-out terminals are fixedly connected on the printed board, and electrical connection is realized through the printed board.

[0017] Further, the second inductor is fixed on the printed board by bolt, and the first inductor, the first capacitor, the second capacitor, the third inductor, the third capacitor, the first transformer, the second transformer and the plurality of lead-out terminals are all welded on the printed board by plug-in mode.

[0018] The tuning circuit of the utility model realizes continuous adjustment of overall capacitance value of tuning equipment by setting adjustable inductor device, a kind of tuning circuit can adapt to the track circuit section of multiple current section, adjacent section frequency combination, increase application range, improve the reliability of tuning equipment.

[0019] Other features and advantages of the utility model will be set forth in the subsequent specification, and, partially, become apparent from the specification, or be understood from the practice of the utility model. The purposes and other advantages of the utility model can be realized and obtained by the structure indicated in the specification, claims and drawings. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings described below are some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0021] Figure 1 A tuning circuit schematic diagram in the embodiment of the present application is shown.

[0022] Figure 2 A track circuit tuning device schematic diagram in the embodiment of the present application is shown.

[0023] Figure 3 Another track circuit tuning device schematic diagram in the embodiment of the present application is shown. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solutions and advantages of the embodiments of the present application more clear, the following will combine the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are some embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0025] As shown in the drawings, Figure 1 The embodiment of the present application introduces a tuning circuit, which comprises a first inductor L1, a first capacitor C1, a second capacitor C2 and a second inductor L2. The first inductor L1, the second capacitor C2 and the second inductor L2 are connected in series, and the first inductor L1 and the second capacitor C2 are connected in parallel with the first capacitor C1. Among them, the second inductor L2 is an adjustable inductor (hereinafter referred to as adjustable inductor L2). The tuning matching unit commonly used in the field at present can realize the functional requirements of tuning matching. The parameters of the tuning device are basically fixed before leaving the factory, and can only be used for specific track circuit sections. It cannot be adaptively adjusted according to the different frequency settings of the track circuit section. In the embodiment of the present application, by setting the adjustable inductor device, the continuous adjustment of the overall capacitance value of the tuning device is realized. The above-mentioned tuning circuit can adapt to track circuit sections of various section, adjacent section frequency combinations, increase the application range, and improve the reliability of the tuning device.

[0026] The adjustable inductor L2 comprises a skeleton, a magnetic core and a winding, the magnetic core and the winding are arranged on the skeleton, and the magnetic core and the winding are movably connected. The magnetic core can also adopt a threaded soft magnetic ferrite core, but is not limited thereto, and other magnetic cores are also suitable for the utility model. When the adjustable inductor L2 is working, according to the law of electromagnetic induction, a magnetic field is generated when current flows through the coil of the adjustable inductor L2, the relative position of the magnetic core and the winding in the adjustable inductor L2 is adjusted, the magnetic field strength in the inductor coil is dynamically changed, thereby causing the change of the inductance value. By arranging the adjustable inductor L2 in the tuning circuit, the tuning circuit can adaptively adjust the adjustable inductor L2 according to the different frequency settings of the track circuit section, thereby improving the applicability and reliability of the tuning circuit.

[0027] One end of the first inductor L1 is connected with a first lead-out terminal, one end of the adjustable inductor L2 is connected with a second lead-out terminal, and the other end is connected with a third lead-out terminal, as shown in the figure, Figure 2 The first lead-out terminal J10, the second lead-out terminal J6 and the third lead-out terminal J9 are respectively located on the side of the steel rail, the first lead-out terminal J10 and the third lead-out terminal J9 are respectively connected with the steel rail, and the second lead-out terminal J6 is a reserved terminal. Further, the tuning circuit, the steel rail inductance, the lead-in wire (the wire connecting the steel rail and the tuning circuit) inductance and the mutual inductance therebetween constitute a parallel resonance, so that the impedance of the tuning device on the side of the steel rail is maximum, and the voltage signal sent to the steel rail is maximum.

[0028] As shown in the figure, Figure 2 The utility model embodiment further provides a track circuit tuning device, the tuning device comprises the tuning circuit and the matching circuit, and the tuning circuit is connected with the matching circuit. By arranging the adjustable inductor device, the continuous adjustment of the overall capacitance value of the tuning device is realized, one tuning circuit can adapt to track circuit sections of multiple frequency combinations of the present section and adjacent sections, the application range is increased, and the reliability of the tuning device is improved.

[0029] As shown in the figure, Figure 2 The tuning device is also called a tuning unit, the matching circuit comprises a third inductor L3, a third capacitor C3, a first transformer T1 and a second transformer T2, one end of the third inductor L3 is connected with the other end of the adjustable inductor L2, the other end of the third inductor L3 is connected with one end of the third capacitor L3, the other end of the third capacitor L3 is connected with a first side of the first transformer T1, the first side of the first transformer T1 is also connected with one end of the first inductor L1, a second side of the first transformer T1 is connected with corresponding equipment and a first side of the second transformer T2 respectively, and a second side of the second transformer T2 is connected with the corresponding equipment. Further, the corresponding equipment comprises a conversion device, the first transformer T1 and the second transformer T2 are connected with the corresponding equipment through lead-out terminals. Figure 2In this design, the first transformer T1 has its first side on the rail side and its second side on the equipment side, while the second transformer T2 has its first side on the rail side and its second side on the equipment side. The leads of the first transformer T1 winding include terminals J11, J5, J12, J13, and J14. The equipment side of the first transformer T1 is typically connected to the corresponding equipment via terminals J11 and J14, while the equipment side of the second transformer T2 is connected to the corresponding equipment via terminals J15-J20. The equipment side of the first transformer T1 is also connected to the rail side of the second transformer T2 via transformer leads; that is, the first transformer T1 connects to the second transformer T2 via its leads J11 and J5, respectively, via its leads J3 and J4. Furthermore, the first transformer T1 and the second transformer T2 achieve a matching connection between the rail impedance and the cable impedance by selecting windings with different turns ratios. When the tuning equipment is used at the transmitting end, the first transformer T1 operates. The rail side of the first transformer T1 is connected in series with the third capacitor C3 and the third inductor L3, and the equipment side of the first transformer T1 is connected to the conversion equipment. When the tuning equipment is used at the receiving end, the second transformer T2 operates. The rail side of the second transformer T2 is connected to the equipment side of the first transformer T1, and the equipment side of the second transformer T2 is connected to the conversion equipment. Furthermore, the lead-out terminals in J1~J20, except... Figure 2 The terminals shown are for external connections; the others are reserved terminals for internal connections and will not be described further here.

[0030] like Figure 3 As shown, the tuning device further includes a printed circuit board B1 and multiple lead-out terminals, which are wiring terminals J1~J20. The first inductor L1, the first capacitor C1, the second capacitor C2, the adjustable inductor L2, the third inductor L3, the third capacitor C3, the first transformer T1, the second transformer T2, and the multiple lead-out terminals J1~J20 are fixedly connected to the printed circuit board B1, achieving electrical connection through the printed circuit board B1. Furthermore, the adjustable inductor L2 is fixed to the printed circuit board B1 by bolts, i.e., fixed to the printed circuit board by bolts and nuts. The first inductor L1, the first capacitor C1, the second capacitor C2, the third inductor L3, the third capacitor C3, the first transformer T1, the second transformer T2, and the multiple lead-out terminals J1~J20 are all soldered to the printed circuit board B1 via plug-in connections.

[0031] The working principle of the tuning device is as follows: the tuning circuit can be equivalent to a variable capacitor, the rail inductance, the lead wire inductance and the mutual inductance therebetween can be equivalent to an inductance, and the tuning device and the equivalent inductance form a parallel resonant circuit.Adjusting the adjustable inductance L2 on the tuning device (i.e., changing the capacitance value of the tuning device) can change the resonant frequency of the parallel resonant circuit to adapt to various working frequencies of the track circuit.When the resonant frequency is consistent with the current section working frequency, the whole parallel resonant circuit impedance is maximum, and the voltage division is highest, so that the voltage sent to the track surface is highest when acting as a sending end, and the voltage received from the rail is highest when acting as a receiving end.

[0032] The utility model can reduce the tuning device model as far as possible, utilize the inductance parameter adjustable characteristics of adjustable inductance, realize the change of resonance point to adapt to the track circuit section of different frequency.

[0033] Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it still can modify the technical scheme recorded in the foregoing each embodiment, or equivalent replacement is carried out to part technical features to the foregoing each embodiment; and these modifications or replacements, do not make the essence of corresponding technical scheme deviate from the spirit and scope of the utility model each embodiment technical scheme.

Claims

1. A tuned circuit, characterized by The tuning circuit comprises a first inductor, a first capacitor, a second capacitor and a second inductor, which are connected in series in sequence, and the first inductor and the second capacitor are connected in parallel with the first capacitor. The second inductor is an adjustable inductor.

2. The tuning circuit of claim 1, wherein, One end of the first inductor is connected with a first lead-out terminal, one end of the second inductor is connected with a second lead-out terminal, and the other end is connected with a third lead-out terminal. The first lead-out terminal, the second lead-out terminal and the third lead-out terminal are located on the rail side, the first lead-out terminal and the third lead-out terminal are connected with the rail respectively, and the second lead-out terminal is a reserved terminal.

3. The tuning circuit of claim 2, wherein, The second inductor comprises a skeleton, a magnetic core and a winding, and the magnetic core and the winding are arranged on the skeleton. The magnetic core and the winding are movably connected.

4. The tuning circuit of claim 3, wherein, The magnetic core is a threaded soft magnetic ferrite core.

5. A track circuit tuning device, characterized in that The tuning circuit comprises a tuning circuit and a matching circuit, and the tuning circuit is connected with the matching circuit.

6. The rail circuit tuning apparatus of claim 5, wherein, The matching circuit comprises a third inductor, a third capacitor, a first transformer and a second transformer. One end of the third inductor is connected with the other end of the second inductor, the other end of the third inductor is connected with one end of the third capacitor, the other end of the third capacitor is connected with a first side of the first transformer, the first side of the first transformer is also connected with one end of the first inductor, a second side of the first transformer is connected with a first side of the second transformer, and the second sides of the first transformer and the second transformer are located on the device side and are connected with corresponding devices respectively.

7. The rail circuit tuning device according to claim 6, characterized in that, The tuning circuit further comprises a printed board and a plurality of lead-out terminals, and the first inductor, the first capacitor, the second capacitor, the second inductor, the third inductor, the third capacitor, the first transformer, the second transformer and the plurality of lead-out terminals are fixedly connected on the printed board, and are electrically connected through the printed board.

8. The rail circuit tuning device according to claim 7, characterized in that, The second inductor is fixed on the printed board through a bolt, and the first inductor, the first capacitor, the second capacitor, the third inductor, the third capacitor, the first transformer, the second transformer and the plurality of lead-out terminals are welded on the printed board through a plug-in mode.

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