CN211085421U - Anti-seismic liquid level sensor for passenger train - Google Patents

Abstract

The utility model discloses a passenger train is with antidetonation type level sensor, including the sensing core pipe, sliding sleeve is equipped with the floater on the body of sensing core pipe, floater internally mounted has annular magnet steel, the sensing core pipe is hollow body structure, the bottom of sensing core pipe is equipped with the separation blade that prevents the floater and break away from the sensing core pipe body, the top of sensing core pipe is equipped with the ring flange, be provided with the PCB circuit board of rectangular shape structure in the body of sensing core pipe inside, equidistant interval is provided with a plurality of hall device group on the PCB circuit board, each hall device group includes a plurality of hall sensor that equidistant interval set up, the tip that the PCB circuit board is located ring flange one side is connected with liquid level display through three-core connector, a plurality of hall device group pull up to the positive pole of power through two pull-up resistance; the Hall sensors are arranged in groups, so that two adjacent Hall device groups independently output and are isolated through the isolation diodes to collect output signals, an induction dead point is eliminated, and the existing three-wire system wiring mode is met.

Description

Anti-seismic liquid level sensor for passenger train

Technical Field

The utility model relates to a passenger train supplies water, fuel feeding equipment's liquid level detection uses the sensor, especially relates to a passenger train is with antidetonation type level sensor, belongs to passenger train corollary equipment technical field.

Background

At present, water supply of a railway passenger train is a necessary guarantee for normal running of a vehicle, water level detection and display of a water tank are particularly important, the running water level of the vehicle is greatly fluctuated due to the fact that the railway passenger train vibrates greatly during running, and a reed pipe in a traditional reed pipe type liquid level sensor is broken easily to lose the detection function due to severe vibration; the Hall sensor device is a solid device, has strong shock resistance and interference resistance, and is very suitable for detecting the liquid level of a passenger train, but dead points are very easy to occur in the using process due to the characteristic of high sensitivity of induction of the Hall sensor device.

Disclosure of Invention

In order to solve the defects of the prior art, the utility model provides an anti-seismic liquid level sensor for passenger trains, which enables two adjacent Hall device groups to independently output and isolate and collect output signals through an isolation diode by grouping and arranging Hall sensors, thereby realizing that an induction dead point is effectively eliminated and the sensor wiring conforms to the three-wire wiring mode of the prior product, and directly replacing the prior reed switch liquid level sensor without changing the wiring and wiring modes; through setting up the resistance size of adjacent hall device group piezo-resistor, realize that output voltage is high when the liquid level is high, the monotonous law change that output voltage is low when the liquid level is low, avoided two sets of adjacent hall device group to be triggered by magnetic field induction simultaneously and cause the problem that output voltage suddenly rises suddenly and suddenly can't calculate and predict, the upper and lower level that arouses to the fluctuation of liquid level triggers simultaneously can effectively be avoided.

The utility model discloses the technical scheme who adopts does:

a shock-resistant liquid level sensor for a passenger train comprises a sensing core pipe, wherein a floating ball is slidably sleeved on a pipe body of the sensing core pipe, annular magnetic steel is installed inside the floating ball, the sensing core pipe is of a hollow pipe body structure, a blocking piece for preventing the floating ball from being separated from the pipe body of the sensing core pipe is arranged at the bottom end of the sensing core pipe, the blocking piece blocks a bottom pipe opening of the sensing core pipe, a flange plate is arranged at the top end of the sensing core pipe, a through hole corresponding to the pipe opening at the top end of the sensing core pipe is formed in the flange plate, a PCB (printed circuit board) with a long strip-shaped structure is arranged inside the pipe body of the sensing core pipe, a plurality of Hall device sets are arranged on the PCB at equal intervals, each Hall device set comprises a plurality of Hall sensors arranged at equal intervals, the end part, located on one side of the flange plate, of the PCB is electrically connected with a liquid level, and two adjacent Hall device groups are respectively pulled up to the positive pole of the power supply by two pull-up resistors.

As a further preferred aspect of the present invention, the hall sensor is welded on the PCB circuit board, and the PCB circuit board is protected with the heat shrink tube and then placed in the inner cavity of the tube body of the sensing core tube.

As a further preferred aspect of the present invention, the output ends of two adjacent hall device groups are respectively isolated by two isolation diodes and then collected for output.

As a further preferred aspect of the present invention, a divider resistor is connected in series between the hall device group and the pull-up resistor, and the resistance values of the divider resistors in the two adjacent hall device groups are different.

The beneficial effects of the utility model reside in that: the floating ball floats up and down along with the liquid level, the Hall device groups arranged on the PCB circuit board in the sensing core pipe are triggered, the PCB circuit board is electrically connected with the liquid level display, and the Hall sensors are arranged in groups, so that two adjacent Hall device groups independently output and are isolated through the isolation diodes to collect output signals, thus effectively eliminating induction dead points, realizing that the wiring of the sensors conforms to the three-wire wiring mode of the existing product, directly replacing the existing reed pipe liquid level sensor without changing the wiring and wiring modes; through setting up the resistance size of adjacent hall device group piezo-resistor, realize that output voltage is high when the liquid level is high, the monotonous law change that output voltage is low when the liquid level is low, avoided two adjacent hall device group to be triggered by magnetic field induction simultaneously and cause the problem that output voltage suddenly rises suddenly and suddenly can't calculate and predict, the upper and lower level that arouses to the fluctuation of liquid level triggers simultaneously can effectively be avoided.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic structural view of a sensing core tube portion according to the present invention;

FIG. 3 is a side view of the structure of FIG. 2;

fig. 4 is a schematic structural diagram of the PCB of the present invention;

FIG. 5 is a circuit schematic of an embodiment;

FIG. 6 is a schematic circuit diagram of two adjacent Hall device groups according to the embodiment;

the main reference numerals in the figures have the following meanings:

the liquid level display device comprises a three-core connector 1, a flange plate 2, a sensing core tube 3, a floating ball 4, a PCB 5, a Hall sensor 6, a blocking piece 7 and a liquid level display 8.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings and examples.

As shown in fig. 1-6: the embodiment is an anti-seismic liquid level sensor for a passenger train, which comprises a sensing core tube 3, wherein a floating ball 4 is slidably sleeved on a tube body of the sensing core tube 3, annular magnetic steel is arranged inside the floating ball 4, the sensing core tube 3 is of a hollow tube body structure, a blocking piece 7 for preventing the floating ball 4 from separating from the tube body of the sensing core tube 3 is arranged at the bottom end of the sensing core tube 3, the blocking piece 7 blocks a bottom end pipe orifice of the sensing core tube 3, a flange 2 is arranged at the top end of the sensing core tube 3, a through hole corresponding to a top end pipe orifice of the sensing core tube 3 is formed in the flange 2, a PCB 5 with a long strip-shaped structure is arranged inside the tube body of the sensing core tube 3, a plurality of Hall device groups are arranged on the PCB 5 at equal intervals, each Hall device group comprises a plurality of Hall sensors 6 arranged at equal intervals, the end part of the PCB 5, which, the plurality of Hall device groups are pulled up to the anode of the power supply through two pull-up resistors, and two adjacent Hall device groups are respectively pulled up to the anode of the power supply through two pull-up resistors; the output ends of two adjacent Hall device groups are respectively isolated by two isolating diodes and then collected for output; a voltage dividing resistor is connected in series between the Hall device group and the pull-up resistor, and the resistance values of the voltage dividing resistors in two adjacent Hall device groups are different; in this embodiment, the hall sensor 6 is welded on the PCB circuit board 5, and the PCB circuit board 5 is protected by the heat shrink tube and then placed in the cavity inside the tube body of the sensing core tube 3, so that effective anti-seismic protection can be obtained.

In the embodiment, nine hall device groups are arranged on a PCB 5 at equal intervals, each hall device group comprises five hall sensors 6 arranged at equal intervals, and the five hall sensors 6 in each hall device group are connected in parallel; the nine Hall device groups correspond to the liquid level display stage number of ten stages, wherein the zero liquid level corresponds to the first Hall device group, namely the first stage with the lowest liquid level display stage number, as shown in H1 in FIG. 5; the second Hall device group displays the second stage of the stage corresponding to the liquid level, as shown in H2 in FIG. 5, and so on; when the floating ball is completely separated from the sensing range of the Hall sensor, the floating ball is a tenth group, namely the liquid level display stage number is the highest tenth stage; the hall sensor in the embodiment is a switch type hall sensor; the sensitivity of the switch type Hall sensor is 10mT, the spacing distance between two adjacent Hall sensors 6 in each Hall device group is 6mm, and the spacing distance between groups in the nine Hall device groups is 25 mm; annular magnetic steel with the magnetic induction intensity of 15mT is arranged inside the floating ball 4; as shown in fig. 5, the first hall device group, the third hall device group, the fifth hall device group, the seventh hall device group and the ninth hall device group represented by H1, H3, H5, H7 and H9 are pulled up to the positive pole of the power supply by one of the pull-up resistors R10; the second Hall device group, the fourth Hall device group, the sixth Hall device group and the eighth Hall device group represented by the other H2, H4, H6 and H8 are pulled up to the positive pole of the power supply by the other pull-up resistor R11; meanwhile, the output ends of the first hall device group, the third hall device group, the fifth hall device group, the seventh hall device group and the ninth hall device group represented by H1, H3, H5, H7 and H9 are isolated by one of the isolating diodes D1 and then collected for output; the output ends of the second Hall device group, the fourth Hall device group, the sixth Hall device group and the eighth Hall device group represented by the other H2, H4, H6 and H8 are isolated by another isolating diode D2 and then collected for output; the two groups of circuits are relatively independent, and output voltage is led out through the three-core connector 1 and sent to the liquid level display 8, so that liquid level display is achieved.

As shown in fig. 6, when any hall sensor in a first hall device group represented by H1 senses a magnetic field of a floating ball, the hall sensor is triggered to be turned on, a voltage divider resistor R1 and a pull-up resistor R10 are connected in series to the ground, the resistance values of R1 and R10 are both 10K Ω, the voltage values of the two divided resistors sink current output through an isolation diode D1, the output voltage U0= 5/(R0 + R0) 0R 0, when any hall sensor in a second hall device group represented by H0 senses the magnetic field of the floating ball, the hall sensor is triggered to be turned on, the voltage divider resistor R0 and the pull-up resistor R0 are connected in series to the ground, the resistance value of R0 is 15K Ω, the resistance value of R0 is 10K Ω, the voltage values of the two divided resistors are output through the isolation diode D0, the voltage values of the two divided resistors U0= 5/(R0 + R0) 0 are set, when the voltage values of the first hall device group and the second hall device group represent high voltage output voltage, the high voltage output voltage and the low voltage output by the isolation diode D0, the hall device is calculated by the adjacent hall device group, and the hall device is not capable of outputting a high voltage output voltage value of the high voltage output.

The utility model discloses the floater floats along with the liquid level from top to bottom, triggers the hall device group of arranging on the PCB circuit board in the sensing core pipe, and the PCB circuit board is connected with the liquid level display electricity, through the hall sensor of block arrangement, makes two adjacent hall device groups independently export and isolate through the isolation diode and collect the output signal, has realized effectively eliminating the induction dead point and has realized that the sensor wiring accords with the three-wire system wiring mode of current product again, can not change wiring, wiring mode, directly replace current tongue tube liquid level sensor; through setting up the resistance size of adjacent hall device group piezo-resistor, realize that output voltage is high when the liquid level is high, the monotonous law change that output voltage is low when the liquid level is low, avoided two adjacent hall device group to be triggered by magnetic field induction simultaneously and cause the problem that output voltage suddenly rises suddenly and suddenly can't calculate and predict, the upper and lower level that arouses to the fluctuation of liquid level triggers simultaneously can effectively be avoided.

The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the principle of the present invention, and these improvements and decorations should also be regarded as the protection scope of the present invention.

Claims (4)

1. The utility model provides a passenger train is with antidetonation type level sensor which characterized in that: the sensor comprises a sensing core pipe, wherein a floating ball is slidably sleeved on a pipe body of the sensing core pipe, annular magnetic steel is installed inside the floating ball, the sensing core pipe is of a hollow pipe structure, a blocking piece for preventing the floating ball from being separated from the pipe body of the sensing core pipe is arranged at the bottom end of the sensing core pipe, the blocking piece blocks a bottom pipe orifice of the sensing core pipe, a flange plate is arranged at the top end of the sensing core pipe, a through hole corresponding to a top pipe orifice of the sensing core pipe is formed in the flange plate, a PCB (printed circuit board) with a strip-shaped structure is arranged inside the pipe body of the sensing core pipe, a plurality of Hall device groups are arranged on the PCB at equal intervals, each Hall device group comprises a plurality of Hall sensors arranged at equal intervals, the end part, located on one side of the flange plate, of the PCB is electrically connected with a liquid level display through a three, and two adjacent Hall device groups are respectively pulled up to the positive pole of the power supply by two pull-up resistors.

2. The shock-resistant liquid level sensor for the passenger train as claimed in claim 1, wherein the hall sensor is welded on a PCB, and the PCB is protected by a heat shrink tube and placed in the cavity inside the sensing core tube.

3. The shock-resistant liquid level sensor for the passenger train as claimed in claim 1, wherein the output ends of two adjacent Hall device groups are respectively isolated by two isolation diodes and then collected for output.

4. The shock-resistant liquid level sensor for the passenger train as claimed in claim 3, wherein a voltage dividing resistor is connected in series between the Hall device groups and the pull-up resistor, and the resistance values of the voltage dividing resistors in two adjacent Hall device groups are different.

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