Automatic drainage circuit of air compressor of rail car

Abstract

The utility model discloses an automatic drainage circuit of a rail car air compressor, and belongs to the technical field of tunnel cars. Comprising a power supply module, an electromagnetic valve, a change-over switch, an air compressor forced start switch, a forced drainage switch, an indicating lamp and a relay. The input end of the change-over switch is electrically connected with the power module, the zero-gear output end of the change-over switch is electrically connected with an emergency stop port of the frequency converter, the first-gear output end of the change-over switch is electrically connected with a normal operation port of the frequency converter, and the second-gear output end of the change-over switch is electrically connected with an RA port of the frequency converter. The input end of the air compressor forced start switch is electrically connected with the power supply module, and the output end is electrically connected with the normal operation port of the frequency converter. The input end of the forced drainage switch is electrically connected with the power module, and the output end is electrically connected with the electromagnetic valve. And an RC port of the relay is electrically connected with the electromagnetic valve. One end of the indicating lamp is electrically connected with the input end of the electromagnetic valve. The common point port of the frequency converter, the output end of the solenoid valve and the other end of the indicating lamp are electrically connected with the cathode of the power supply module.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of tunnel car, especially relates to a track car air compressor automatic drainage circuit. BACKGROUND

[0002] The track car air brake system is the extremely important device for ensuring the whole car operation safety, improving the whole car speed and railway passing capacity. In order to ensure the normal tool of each track car air system, and have necessary reliability and durability, it is very necessary to require the track car air compressor to provide dry compressed air. At present, the air system of track car is applied to the brake system of whole car, the traction motor heat dissipation of electric drive track car, the air contactor and commutator in control circuit, air horn, sanding system air, etc. When the air compressor drainage device of whole car cannot work effectively, it will affect the normal service life of whole car pipeline system, the normal action and life of related electric appliances.

[0003] The air compressor is the key component of track car, and because the air humidity of track car working environment is higher, it will cause the air compressor valve and air pipe line to appear failure due to water accumulation, and it needs to be maintained frequently, so the drainage work of gas storage tank must be carried out in time, otherwise it will cause corrosion to air compressor unit, starting valve group and air pipe line system due to long-term water accumulation, and further cause the adverse effects such as sealing not tight or jamming. At present, the common drainage methods have two kinds, one is to arrange staff to carry out manual drainage, and the other is automatic drainage.

[0004] For manual drainage, the water accumulation amount and water accumulation depth in the air compressor gas storage tank cannot be controlled, and the gas storage tank will continuously accumulate water when the track car runs, and if only drainage is carried out according to the specified time, the water accumulation is too much in some cases. Although the experienced driver can judge the drainage time according to experience, when the air humidity is abnormally high, the water accumulation in the gas storage tank may be far more than the estimated amount, and if the driver cannot detect and drain water in time, the work of air compressor will be affected. The working state of air compressor, valve group and air pipe line system directly affects the braking effect of track car, and water accumulation may cause safety hazards.

[0005] The automatic drainage can refer to the following patent:

[0006] A patent with application number CN201620263221.2 discloses an automatic drainage control circuit for air compressor of railcar, which comprises an air compressor running main contactor, a power-off delay time relay, a power-on delay time relay, and a drainage electromagnetic valve (SV). One end of the normally open contact (1KM-1) of the air compressor running main contactor is connected with one end of a first parallel branch composed of the power-off delay contact (KT1-1) of the power-off delay time relay and the first instantaneous contact (KT2-2) of the power-on delay time relay. The other end of the first parallel branch is connected with one end of the power-on delay contact (KT2-1) of the power-on delay time relay. The other end of the power-on delay contact (KT2-1) of the power-on delay time relay is connected with one end of a second parallel branch composed of the power-off delay time relay coil (KT1) and the power-on delay time relay coil (KT2). The second instantaneous contact (KT2-3) of the power-on delay time relay and the drainage electromagnetic valve (SV) form a series branch. One end of the series branch is connected with the common contact of the normally open contact (1KM-1) of the air compressor running main contactor, the power-off delay contact (KT1-1) of the power-off delay time relay, and the first instantaneous contact (KT2-2) of the power-on delay time relay. The other end of the series branch is connected with the other end of the second parallel branch.

[0007] The patent with the application number CN201821261566.X discloses an automatic drainage control circuit of an air compressor of a railcar, which comprises a main contactor, a power-off delay time relay, a power-on delay time relay and a drainage electromagnetic valve SV, one end of a normally open contact 1KM-1 of the main contactor is connected with one end of a power-off delay contact KT1-1 of the power-off delay time relay, one end of a first instantaneous contact KT2-2 of the power-on delay time relay and one end of a second instantaneous contact KT2-3 of the power-on delay time relay, the other end of the normally open contact 1KM-1 of the main contactor is connected with one end of a resistance R1 and a voltage input end Vin, the other end of the power-off delay contact KT1-1 of the power-off delay time relay is connected with one end of a power-on delay contact KT2-1 of the power-on delay time relay, the other end of the power-on delay contact KT2-1 of the power-on delay time relay is connected with one end of a power-off delay time relay coil KT1 and a power-on delay time relay coil KT2, the other ends of the power-off delay time relay coil KT1 and the power-on delay time relay coil KT2 are connected with a voltage output end Vout, the other end of the second instantaneous contact KT2-3 of the power-on delay time relay is connected with a resistance R4 and one end of the drainage electromagnetic valve SV, the other end of the drainage electromagnetic valve SV is connected with the voltage output end Vout, the other end of the resistance R1 is connected with one end of a resistance R2, the other end of the resistance R2 is connected with one end of a capacitor C1 and a capacitor C2, the other end of the capacitor C2 is connected with a second pin of a comparator U, the other end of the resistance R4 is connected with a seventh pin of the comparator U, the other end of the capacitor C1 is connected with a positive electrode of a diode D and grounded, a negative electrode of the diode D is connected with one end of a resistance R5 and a third pin of the comparator U.

[0008] The prior art realizes the timing cycle drainage function in the circuit through the cooperation of the power-on delay relay and the power-off delay relay in the circuit. Practical new type content

[0009] In order to solve the above problems, the utility model embodiment provides a kind of railcar air compressor automatic drainage circuit, and the patent according to the use condition of the frequency converter of air compressor controls drainage, not only simple circuit, easy to maintain;Drainage can be carried out according to the actual situation of air compressor, provides security guarantee for the travel of railcar.The technical scheme is as follows:

[0010] The utility model discloses an automatic drainage circuit of railcar air compressor, including power module, electromagnetic valve and the relay of frequency converter of air compressor, the electromagnetic valve is located on the drainage port of air compressor, the normal operation port X1 of frequency converter is connected with the anode of power module electricity, and its common point port COM is connected with the cathode of power module electricity, the RA port of relay is connected with the anode of power module electricity, and its RC port is connected with the input of electromagnetic valve electricity, the output of electromagnetic valve is connected with the cathode of power module electricity, and the RC port is the normally open port, when the frequency of frequency converter is in the predetermined range, the RA port and RC port are conducted.

[0011] Preferably, the drainage circuit further comprises a switch SA1, an air compressor start switch SB1 and a forced drainage switch SB2, the RA port of the relay, the emergency stop port X2 of the frequency converter or the normal operation port X1 of the frequency converter is connected with the anode of the power module through the switch SA1, the normal operation port X1 of the frequency converter is connected with the anode of the power module through the switch SA1 or the air compressor start switch SB1, the switch SA1 is provided with three switch gears, the input of the switch SA1 is connected with the anode of the power module, the zero gear output end is connected with the emergency stop port X2 of the frequency converter, the first gear output end is connected with the normal operation port X1 of the frequency converter, and the second gear output end is connected with the RA port, the input of the air compressor start switch SB1 is connected with the anode of the power module, and the output is connected with the normal operation port X1 of the frequency converter, the input of the forced drainage switch SB2 is connected with the anode of the power module, and the output is connected with the input of the electromagnetic valve.

[0012] Further, the drainage circuit further comprises an indicator HL1, and the two ends of the indicator HL1 are connected with the input and the output of the electromagnetic valve respectively.

[0013] Specifically, the power module is a switching power supply TDR-480-24, and the input end of the switching power supply TDR-480-24 is connected with the power line of the frequency converter.

[0014] Specifically, the frequency converter is a V9-4T-15G.

[0015] Specifically, the switch SA1 is a knob switch.

[0016] The utility model discloses an automatic drainage circuit of air compressor of railcar, and the patent controls drainage according to the use condition of the frequency converter of air compressor, which is not only simple in circuit and easy to maintain, but also can drain according to the actual condition of air compressor, providing safety guarantee for the running of railcar. In addition, the patent can realize the free conversion of working mode (gear 1 and gear 2) and maintenance mode (gear 0). By pressing air compressor strong start switch SB1 and forced drainage switch SB2, the forced drainage of gas storage tank and the forced start of air compressor can be realized, providing convenience for maintenance. It is very flexible to use. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is the circuit diagram of frequency converter, air compressor and power module combination;

[0018] Figure 2 is the circuit diagram of automatic drainage circuit of air compressor of railcar;

[0019] Figure 3 is the circuit diagram of automatic drainage circuit of air compressor of railcar with switching function. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical scheme and advantages of the utility model more clear, the utility model will be described in further detail below in conjunction with the drawings.

[0021] Embodiment 1

[0022] Referring to Figure 1 and 2 , embodiment 1 provides an automatic drainage circuit of air compressor of railcar, which comprises power module, electromagnetic valve and relay of frequency converter of air compressor, the electromagnetic valve is arranged on the drainage port of air compressor, and the power module and frequency converter are electrically connected with power line. The normal running port X1 of frequency converter is electrically connected with the positive pole of power module, and the common point port COM is electrically connected with the negative pole of power module. The RA port of relay is electrically connected with the positive pole of power module, and the RC port is electrically connected with the input end of electromagnetic valve. The output end of electromagnetic valve is electrically connected with the negative pole of power module, the RA port is used to realize FDT detection, and the RC port is normally open port. When the frequency of frequency converter is in the predetermined range, the RA port and RC port are turned on.

[0023] When the rail car is started, the air compressor starts the pumping process, and the frequency of the air compressor frequency converter gradually increases. When the output frequency enters the set frequency detection range, the output signal is effective at this time, and the electromagnetic ball valve is opened, and the air compressor is automatically drained and started; when the output frequency exceeds the detection range, the output signal is invalid, and the automatic drainage process is ended. In addition, the pressure switch of the air compressor set is used to monitor the pressure value of the air compressor in real time, and when the pressure reaches the rated value, the shutdown program is triggered, and the frequency converter output frequency quickly returns to zero. In the frequency decreasing stage, it will enter the frequency detection range again, and it will drain again, but this time the drainage time is shorter. When the gas in the air compressor gas tank is consumed and the pressure is insufficient, the air compressor will start the pumping cycle again to ensure the stable operation of the whole system.

[0024] Due to the large difference in air humidity under different working environments, the water accumulation in the air compressor gas tank also changes. In order to meet the diversified drainage time requirements, the frequency detection range of the frequency converter can be set to lengthen or shorten the drainage time, ensure the completion of the drainage task, and provide protection for the stable operation of the air compressor.

[0025] Embodiment 2

[0026] Referring to Figure 1 and 3 , embodiment 2 provides an automatic drainage circuit of an air compressor of a rail car, which comprises a power module, an electromagnetic valve, a switch SA1, an air compressor forced start switch SB1, a forced drainage switch SB2, an indicator lamp HL1 and a relay of a frequency converter of the air compressor. The electromagnetic valve is arranged on the drainage port of the air compressor, and the power module and the frequency converter are electrically connected with the power line. The switch SA1 is provided with three switching gears (zero gear, first gear and second gear). The input end of the switch SA1 is electrically connected with the positive electrode of the power module, the zero gear output end is electrically connected with the emergency stop port X2 (specifically, port 5) of the frequency converter, the first gear output end is electrically connected with the normal operation port X1 (specifically, port 4) of the frequency converter, and the second gear output end is electrically connected with the RA port (specifically, port 1). The input end of the air compressor forced start switch SB1 is electrically connected with the positive electrode of the power module, and the output end is electrically connected with the normal operation port X1 (specifically, port 4) of the frequency converter. The input end of the forced drainage switch SB2 is electrically connected with the positive electrode of the power module, and the output end is electrically connected with the input end of the electromagnetic valve. The RC port (specifically, port 3) of the relay is electrically connected with the input end of the electromagnetic valve. One end of the indicator lamp HL1 is electrically connected with the input end of the electromagnetic valve. The common point port COM (specifically, port 6) of the frequency converter, the output end of the electromagnetic valve and the other end of the indicator lamp HL1 are electrically connected with the negative electrode of the power module.

[0027] Specifically, the switch SA1 in the embodiment of the utility model is a knob switch. It is convenient to operate.

[0028] Further, the switch SA1, the air compressor forced start switch SB1, the forced drainage switch SB2 and the indicator light HL1 are arranged on the control cabinet. In the present patent, other electronic components such as resistors, voltage protection circuits and current protection circuits can be arranged as needed.

[0029] The present patent can realize free conversion of working mode (gear 1 and gear 2) and maintenance mode (gear 0). Specifically, through the switch SA1, the three gears 0, 1 and 2 can be freely switched, wherein the 0 gear is the maintenance mode (connected with the 0 contact in the figure), at this time the air compressor will be forced to stop, providing a safe working environment for maintenance personnel and avoiding safety risks caused by misoperation. The 1 and 2 gears are working modes, when in the 1 gear (connected with the 1 contact in the figure), the air compressor forced start and forced drainage functions can be realized, but the automatic drainage function of the air compressor cannot be realized. When in the 2 gear (connected with the 2 contact in the figure), the air compressor forced start, forced drainage and automatic drainage functions can be realized. The gear switch is convenient to operate, improving the flexibility and convenience of operation. At the same time, the air tank forced drainage and air compressor forced start functions can be realized by pressing the air compressor forced start switch SB1 and the forced drainage switch SB2, providing convenience for maintenance.

[0030] Embodiment 3

[0031] Embodiment 3 provides an air compressor automatic drainage circuit for a rail car, which has basically the same structure as the air compressor automatic drainage circuit for a rail car in Embodiment 1 or Embodiment 2, except that the power supply module in the present embodiment is a switching power supply TDR-480-24, the input end of which is connected with the power supply line of the frequency converter. The frequency converter is V9-4T-15G.

[0032] Embodiment 4

[0033] Embodiment 4 provides a control method for the aforementioned air compressor automatic drainage circuit for a rail car, which comprises: setting the parameters of the frequency converter, selecting the parameter number F8-30 and setting it to 30, at this time the frequency detection value of the frequency converter has been set to 30HZ; then, selecting the parameter number F8-31 and setting it to 5, completing the frequency detection width setting of the frequency converter. The upper limit of the frequency of the air compressor frequency converter is 50HZ, which takes 20 seconds to rise from 0HZ to 50HZ, and because the set frequency detection width is 5HZ, the time length of the output in the effective state during the frequency rising process is 2 seconds (draining water between 30HZ and 35HZ). When the output is effective, the electromagnetic valve is opened, and the air compressor immediately performs 2 seconds of automatic drainage; after 2 seconds, as the output frequency exceeds the detection width, the output becomes invalid, the electromagnetic valve is closed, and the drainage stops.

[0034] After the air compressor finishes pumping, the output frequency will decrease from 50HZ to 0HZ, and the time consumption is 10 seconds. The same as the rising process, the drainage operation will be carried out for 1 second (draining water between 30HZ-35HZ) in the falling stage. In addition, a pilot lamp HL1 (which can be installed on the control cabinet) is connected in parallel with the electromagnetic valve. When the electromagnetic valve works, the pilot lamp HL1 is on; when the electromagnetic valve stops working, the pilot lamp HL1 is off. The personnel in the rail car can directly observe the working state of the electromagnetic valve, which can effectively avoid the situation that the air in the air compressor leaks or the water is not drained in time due to the electromagnetic valve not working normally, and the personnel in the car do not realize it.

[0035] Each pumping process is accompanied by drainage operation, which guarantees the operation efficiency of the air compressor. For different air humidity environments, the drainage time can be flexibly controlled by adjusting the detection width. The greater the air humidity, the longer the drainage time. The advantage of the scheme is that only two parameters (30 and 5) need to be set to adjust the automatic drainage time, which is convenient for the operator to work and saves time and labor cost.

[0036] The above is only a preferred embodiment of the present application, and is not used to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A railcar air compressor automatic drainage circuit, comprising a power module, a solenoid valve and a relay of a frequency converter of the air compressor, the solenoid valve is arranged on a drainage port of the air compressor; a normal operation port X1 of the frequency converter is electrically connected with a positive electrode of the power module, and a common point port COM is electrically connected with a negative electrode of the power module; characterized in that, The RA port of the relay is electrically connected with the positive pole of the power module, and the RC port of the relay is electrically connected with the input end of the electromagnetic valve; the output end of the electromagnetic valve is electrically connected with the negative pole of the power module, and the RC port is a normally open port; when the frequency of the frequency converter is in a predetermined range, the RA port and the RC port are turned on.

2. The railcar air compressor automatic drain circuit of claim 1, wherein, The drainage circuit further comprises a switching switch SA1, an air compressor forced start switch SB1 and a forced drainage switch SB2, the RA port of the relay, the emergency stop port X2 of the frequency converter or the normal operation port X1 of the frequency converter is electrically connected with the positive pole of the power module through the switching switch SA1, the normal operation port X1 of the frequency converter is electrically connected with the positive pole of the power module through the switching switch SA1 or the air compressor forced start switch SB1, the switching switch SA1 is provided with three switching gears; the input end of the switching switch SA1 is electrically connected with the positive pole of the power module, the zero gear output end of the switching switch SA1 is electrically connected with the emergency stop port X2 of the frequency converter, the first gear output end of the switching switch SA1 is electrically connected with the normal operation port X1 of the frequency converter, and the second gear output end of the switching switch SA1 is electrically connected with the RA port; the input end of the air compressor forced start switch SB1 is electrically connected with the positive pole of the power module, and the output end of the air compressor forced start switch SB1 is electrically connected with the normal operation port X1 of the frequency converter; the input end of the forced drainage switch SB2 is electrically connected with the positive pole of the power module, and the output end of the forced drainage switch SB2 is electrically connected with the input end of the electromagnetic valve.

3. The railcar air compressor automatic drain circuit of claim 1 or 2, wherein, The drainage circuit further comprises an indicating lamp HL1, and the two ends of the indicating lamp HL1 are respectively electrically connected with the input end and the output end of the electromagnetic valve.

4. The railcar air compressor automatic drain circuit of claim 1, wherein, The power module is a switching power supply TDR-480-24, and the input end of the power module is connected with the power line of the frequency converter.

5. The railcar air compressor automatic drain circuit of claim 1, wherein, The frequency converter is a V9-4T-15G.

6. The railcar air compressor automatic drain circuit of claim 2, wherein, The switching switch SA1 is a knob switch. The frequency converter is a V9-4T-15G.

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