Air compressor state detection circuit, air compressor and rail train

Abstract

The utility model discloses an air compressor state detection circuit, an air compressor and a rail train. The state detection circuit comprises a first detection module, a second detection module, a third detection module, a fourth detection module, a fifth detection module, a sixth detection module, a seventh detection module, an eighth detection module, a control module, a communication module and a power module. The first detection module, the second detection module, the third detection module, the fourth detection module, the fifth detection module, the sixth detection module, the seventh detection module and the eighth detection module are respectively connected with the control module, the control module is connected with the communication module, the communication module is used for uploading detection data to an upper computer, and the power supply module is used for supplying power to the modules. According to the utility model, the detection accuracy of the operation parameters of the air compressor is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to air compressor fault detection technical field especially relates to a kind of air compressor state detection circuit, air compressor and rail train. BACKGROUND

[0002] Rail train is a kind of vehicle for transporting personnel and / or goods, and is one of the important components of modern transportation system. Train air compressor is an important part of rail train, and air compressor is a kind of equipment for generating compressed air, which is usually used to provide power for the braking system, air spring, air door, etc. of rail train.

[0003] During the operation of rail train, the operation state detection of air compressor is an important measure to ensure the safety of train. At present, the operation state detection of air compressor is usually the on-off quantity detection of internal state limit change value, and then indirectly judges whether air compressor is normal operation according to on-off quantity. Although this method can roughly understand the operation problem of air compressor, it cannot realize more direct and accurate detection, and further cannot quickly locate the fault, which affects the maintenance efficiency and leaves safety hazards. UTILITY MODEL CONTENT

[0004] The utility model aims at providing a kind of air compressor state detection circuit, air compressor and rail train to solve the problem that traditional method cannot more directly and accurately detect the operation state of air compressor.

[0005] The utility model solves the above technical problem by the following technical scheme: a kind of air compressor state detection circuit, including the first detection module for detecting lubricating oil temperature analog quantity, the second detection module for detecting inlet air temperature analog quantity, the third detection module for detecting exhaust temperature analog quantity, the fourth detection module for detecting the air pressure analog quantity in lubricating oil cylinder, the fifth detection module for detecting inlet air pressure analog quantity, the sixth detection module for detecting exhaust pressure analog quantity, the seventh detection module for detecting pressure analog quantity after oil filtration, the eighth detection module for detecting pressure analog quantity after oil separation, control module, communication module and power module;

[0006] The first detection module, the second detection module, the third detection module, the fourth detection module, the fifth detection module, the sixth detection module, the seventh detection module and the eighth detection module are connected with the control module respectively, the control module is connected with the communication module, and the communication module is used to upload each detection data to host computer.

[0007] Each detection module feeds back the running parameters of the air compressor to the control module in the form of analog quantity (for example, current value), and then the control module converts the analog quantity into corresponding parameter detection value and uploads it to the upper computer for display through the communication module, and the running state of the air compressor is determined by the upper computer or manually according to the parameter detection value.

[0008] Further, the first detection module, the second detection module, the third detection module, the fourth detection module, the fifth detection module, the sixth detection module, the seventh detection module and the eighth detection module each include a first protection circuit, an amplifier, a second protection circuit and a corresponding parameter detection sensor connected in sequence, and the first protection circuit is connected with the control module.

[0009] Further, the communication module includes a third protection circuit, a network transformer chip, a first lightning arrester, a second lightning arrester and a connector; the third protection circuit is connected with the control module and the network transformer chip, the network transformer chip is connected with the first lightning arrester and the second lightning arrester, and the first lightning arrester and the second lightning arrester are connected with the connector.

[0010] Further, the power module includes a fourth protection circuit, a first filter circuit, a DCDC chip, a fifth protection circuit, a second filter circuit, an LDO chip and a third filter circuit connected in sequence.

[0011] Further, the state detection circuit further includes a ninth detection module for detecting the on-off quantity of the lubricating oil temperature, a tenth detection module for detecting the on-off quantity of the air pressure in the lubricating oil cylinder, an eleventh detection module for detecting the on-off quantity of the exhaust pressure, and a twelfth detection module for detecting the start signal of the air compressor.

[0012] The ninth detection module, the tenth detection module, the eleventh detection module and the twelfth detection module are connected with the control module.

[0013] Further, the ninth detection module, the tenth detection module, the eleventh detection module and the twelfth detection module each include a first optocoupler chip, a corresponding on-off quantity detection sensor and a corresponding state switch; the state switch is connected with the on-off quantity detection sensor, and the on-off quantity detection sensor is connected with the control module through the first optocoupler chip.

[0014] Furthermore, the state detection circuit also includes a switch control circuit, which includes a second optocoupler chip, a switch chip, and a control switch; the control switch is controlled by the switch chip, and the switch chip is connected to the control module through the second optocoupler chip; the control switch is connected to the load.

[0015] Furthermore, the state detection circuit also includes a storage circuit, which is connected to the control module.

[0016] Based on the same concept, this utility model also provides an air compressor, which includes the air compressor status detection circuit described above.

[0017] Based on the same concept, this utility model also provides a rail train, which includes the air compressor described above.

[0018] Beneficial effects

[0019] Compared with the prior art, the advantages of this utility model are:

[0020] The air compressor detection circuit provided by this utility model uses various detection modules to detect the analog quantities of the air compressor's operating parameters. Then, the control module converts the analog quantities of the operating parameters into the detected values ​​of the operating parameters, and uploads them to the host computer for display via the communication module. This allows the host computer or a person to determine the operating status of the air compressor based on the detected values ​​of each parameter. Compared with switch quantity detection, this utility model can detect each operating parameter more directly, thus improving the detection accuracy of the operating parameters. Attached Figure Description

[0021] To more clearly illustrate the technical solution of this utility model, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only one embodiment of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a structural block diagram of the air compressor status detection circuit in an embodiment of this utility model;

[0023] Figure 2 This is a circuit diagram of the first detection module, the second detection module, the third detection module, the fourth detection module, the fifth detection module, the sixth detection module, the seventh detection module, and the eighth detection module in this embodiment of the present invention.

[0024] Figure 3 This is a circuit schematic diagram of the communication module in an embodiment of this utility model;

[0025] Figure 4This is a circuit diagram of the power module in an embodiment of this utility model;

[0026] Figure 5 This is a circuit diagram of the ninth, tenth, eleventh, and twelfth detection modules in this embodiment of the present invention.

[0027] Figure 6 This is a schematic diagram of the switch control circuit in an embodiment of this utility model;

[0028] Figure 7 This is a schematic diagram of the storage circuit in an embodiment of this utility model;

[0029] Figure 8 This is a schematic diagram of the main control chip of the control module in an embodiment of this utility model. Detailed Implementation

[0030] The technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0031] The technical solutions of this application will be described in detail below with specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments.

[0032] like Figure 1 As shown in the figure, the air compressor status detection circuit provided in this embodiment includes a first detection module, a second detection module, a third detection module, a fourth detection module, a fifth detection module, a sixth detection module, a seventh detection module, an eighth detection module, a control module, a communication module, and a power supply module. The first, second, third, fourth, fifth, sixth, seventh, and eighth detection modules are respectively connected to the control module, which is connected to the communication module. The communication module is used to upload the detection data to a host computer, and the power supply module is used to supply power to each module. In this embodiment, the host computer is a train control unit, which displays the detection values ​​of various operating parameters of the air compressor. This allows the train control unit to determine the fault status of the air compressor based on these values, or allows manual judgment based on these values. Obtaining accurate air compressor operating parameter detection values ​​through each detection module facilitates more accurate judgment and analysis of the air compressor's operating status by the train or by manual judgment.

[0033] The first detection module is used to detect the simulated temperature of the lubricating oil inside the air compressor cylinder. The second detection module is used to detect the simulated temperature of the air intake at the air compressor inlet. The third detection module is used to detect the simulated temperature of the exhaust in the air compressor exhaust pipe. The fourth detection module is used to detect the simulated air pressure (i.e., the compressor head pressure) inside the air compressor cylinder (i.e., the cylinder containing lubricating oil, with part of the cylinder containing lubricating oil and part containing air). The fifth detection module is used to detect the simulated air intake pressure at the air compressor inlet. The sixth detection module is used to detect the simulated exhaust pressure in the air compressor exhaust pipe. The seventh detection module is located at the tail end of the oil filter and is used to detect the simulated pressure after the oil filter. The eighth detection module is located at the output end of the oil-gas separator and is used to detect the simulated pressure after the oil is separated (i.e., the simulated air pressure after the oil in the air is separated).

[0034] In a specific embodiment of this utility model, such as Figure 2 As shown, the first, second, third, fourth, fifth, sixth, seventh, and eighth detection modules each include a first protection circuit, an amplifier, a second protection circuit, and a corresponding parameter detection sensor connected in sequence. The first protection circuit is connected to the control module. For the first, second, and third detection modules, the corresponding parameter detection sensor is a temperature sensor; for the fourth, fifth, sixth, seventh, and eighth detection modules, the corresponding parameter detection sensor is a pressure sensor.

[0035] like Figure 2 As shown, the first protection circuit includes diode D1, capacitor C1, and resistor R1. The cathode of diode D1 is connected to a 3.3V power supply, and the anode of diode D1 is connected to the control module, capacitor C1, and resistor R1. Resistor R1 is connected to the output terminal of amplifier U2. The second protection circuit includes resistor R2, resistor R3, capacitor C2, resistor R4, and diode D2. Resistor R2, capacitor C2, and resistor R3 are connected to the positive input terminal of amplifier U2. Resistor R4 and diode D2 are connected to resistor R3. Resistor R3 is also connected to the corresponding parameter detection sensor.

[0036] In this embodiment, diode D1 can be a silicon epitaxial planar diode, which has the function of protecting against reverse voltage or surge. Diode D1 can also be a diode with model number 1N4148, 1N914, 1N4448 or 1N914B, etc.

[0037] Amplifier U2 amplifies the small current value detected by the corresponding parameter detection sensor, so that the control module can convert the amplified current value into the corresponding parameter detection value. Diode D1 in the first protection circuit prevents reverse voltage from flowing to amplifier U2, and the high-pass RC filter composed of resistor R1 (e.g., 1000K) and capacitor C1 (e.g., 1000pF) further prevents low-frequency signal interference and improves the accuracy of the current signal.

[0038] The second protection circuit includes multiple resistors and capacitors C2. For example, resistor R2 is set to 2KΩ, resistor R3 is set to 2KΩ, resistor R4 is set to 250Ω, and capacitor C2 is set to 1000pF. This forms a high-pass and low-pass hybrid filter circuit. At the same time, the resistors also serve as protection circuits, and the amplification ratio can be adjusted by changing the resistance value. Diode D2 is set as a Zener diode to stabilize the voltage. Diode D2 can be an SMBJ6.5A or other diodes of the same polarity.

[0039] In a specific embodiment of this utility model, such as Figure 3 As shown, the communication module includes a third protection circuit, a network transformer chip U9, a first surge arrester D5, a second surge arrester D6, and a connector J5. The third protection circuit is connected to the control module and the network transformer chip U9. The network transformer chip U9 is connected to the first surge arrester D5 and the second surge arrester D6. The first surge arrester D5 and the second surge arrester D6 are connected to the connector J5. The connector J5 is connected to the host computer.

[0040] In this embodiment, the third protection circuit includes an electrostatic discharge (ESD) protection chip U8, the selected model of which is SLVU2.8-4; a network transformer chip U9, the selected model of which is 11FB-05NL; and a first surge arrester D5 and a second surge arrester D6, the selected models of which are B3D090L. Figure 3 In the circuit, resistors R10, R11, R12, and R13 are used to protect the ports of the network transformer chip U9. Resistors R14 and R15, together with capacitor C9, form a filter to reduce interference.

[0041] The communication module provides Ethernet communication so that the control module can transmit the detected values ​​of various parameters to the host computer or other devices; at the same time, the network transformer chip is protected by the third protection circuit, the first surge arrester D5 and the second surge arrester D6.

[0042] In a specific embodiment of this utility model, such as Figure 4 As shown, the power supply module includes a fourth protection circuit, a first filter circuit, a DC-DC chip U6, a fifth protection circuit, a second filter circuit, an LDO chip U7, and a third filter circuit connected in sequence.

[0043] likeFigure 4 As shown, the fourth protection circuit includes fuse F2, diode D3, and varistor MOV1. The anode of diode D3 is connected to connector J4 via fuse F2. Varistor MOV1 is connected to fuse F2 and the anode of diode D3. Connector J4 is used to connect to an external power supply. The first filter circuit includes capacitor C3, inductor L1, and capacitor C4. Capacitor C3 and inductor L1 are connected to the cathode of diode D3. Capacitor C4 is connected to inductor L1 and the input terminal of DC-DC chip U6. The output terminal of DC-DC chip U6 is connected to fuse F3 in the fifth protection circuit. The fifth protection circuit includes fuse F3 and Zener diode DT. The second filter circuit includes inductor L2, capacitor C5, and capacitor C6. Capacitors C5, C6, and inductor L2 are connected to the input terminal of LDO chip U7. Inductor L2 is connected to fuse F3 and Zener diode DT. The third filter circuit includes diode D4, inductor L3, capacitor C7 and capacitor C8. The cathode of diode D4 and inductor L3 are connected to the output terminal of LDO chip U7, and capacitors C7 and C8 are connected to inductor L3.

[0044] In this embodiment, the DC-DC chip U6 is selected as WRB11024MD-6W, the LDO chip U7 is selected as LM2596-5.0, the varistor MOV1 is selected as 14D181K, capacitors C3 and C4 can be selected as 10uF polarized capacitors, the fuse F3 is selected as nSMD035-33V, the Zener diode DT is selected as SMBJ26CA, capacitors C6 and C8 are low-value capacitors, and capacitors C5 and C7 are polarized capacitors.

[0045] The external 110V power supply is converted to 24V output via DC-DC chip U6, and the 24V output is converted to 5V output via LDO chip U7, providing power to the various modules in the air compressor status detection circuit.

[0046] In a specific embodiment of this utility model, the state detection circuit further includes a ninth detection module, a tenth detection module, an eleventh detection module, and a twelfth detection module; the ninth, tenth, eleventh, and twelfth detection modules are respectively connected to the control module. The ninth detection module is used to detect the switching quantity of the lubricating oil temperature inside the air compressor cylinder, the tenth detection module is used to detect the switching quantity of the air pressure inside the lubricating oil cylinder, the eleventh detection module is used to detect the switching quantity of the exhaust pressure of the air compressor exhaust pipe, and the twelfth detection module is used to detect the air compressor start signal.

[0047] like Figure 5As shown, the ninth, tenth, eleventh, and twelfth detection modules each include a first optocoupler chip U3, a corresponding switch quantity detection sensor, and a corresponding status switch. The status switch is connected to the switch quantity detection sensor, and the switch quantity detection sensor is connected to the control module through the first optocoupler chip U3. Electrical isolation is achieved through the first optocoupler chip U3, reducing circuit noise. In this embodiment, the selected model of the first optocoupler chip U3 is TLP184.

[0048] A status switch is used to reflect changes in the corresponding signal, and a switch quantity detection sensor is used to detect changes in the status switch, thereby outputting high and low level signals. For example, in the ninth detection module, when the lubricating oil temperature is higher than a set threshold (e.g., 120°C), the corresponding status switch closes, the corresponding switch quantity detection sensor detects a high-level signal, and sends the high-level signal to the control module through the first optocoupler chip; when the lubricating oil temperature is lower than the set threshold (e.g., 120°C), the corresponding status switch opens, the corresponding switch quantity detection sensor detects a low-level signal, and sends the low-level signal to the control module through the first optocoupler chip. In the twelfth detection module, a status switch is used to capture the start signal. When the air compressor starts, the status switch captures the start signal, and then the corresponding switch quantity detection sensor outputs a high level to the control module. The control module determines the start time based on this high-level signal to calculate the parameter rate based on the start time. For example, using the start time as the starting time, the heating rate of the lubricating oil temperature is calculated, and the time it takes for each pressure detection value (e.g., the air pressure detection value inside the lubricating oil cylinder and the exhaust pressure detection value) to reach the corresponding pressure threshold is calculated.

[0049] In a specific embodiment of this utility model, such as Figure 6 As shown, the state detection circuit further includes a switch control circuit, which includes a second optocoupler chip U4, a switch chip U5, and a control switch. The control switch is controlled by the switch chip U5, which is connected to the control module through the second optocoupler chip U4. The control switch is connected to the load. In this embodiment, the control switch is a relay. Figure 6 In this circuit, the selected fuse F1 is model JK-MSMD110-33V, the resistance of resistor R7 is 470 ohms, and the resistances of resistors R8 and R9 are both 10K.

[0050] In this embodiment, the second optocoupler chip U4 is selected as either TLP184 or EL357, and the switch chip U5 is selected as WSP6946, which can be used for multi-channel switch control. When the control module receives a start signal, it controls the relay coil to be energized after a certain interval (e.g., 5 seconds), causing the relay contacts to close and increasing the load. In case of abnormal operation, the host computer can also send a command to the control module to de-energize the relay coil, disconnect the load, and prevent accidents caused by abnormal operation.

[0051] In a specific embodiment of this utility model, such as Figure 7 As shown, the status detection circuit also includes a storage circuit, which is connected to the control module. The storage circuit enables capacity expansion and stores historical detection data. In this embodiment, the main chip U10 of the storage circuit is a 25Q128.

[0052] In a specific embodiment of this utility model, the main control chip U1 of the control module is selected as STM32F107VC, such as... Figure 8 As shown.

[0053] This invention can detect the analog quantities of various parameters of the air compressor's operating status, and then the control module converts the analog quantities of each parameter into specific parameter detection values, which are then displayed on the host computer. This improves the detection accuracy of the air compressor's operating parameters, and facilitates the use of these parameter detection values ​​to determine the air compressor's operating status. In case of abnormal operation, it enables quick location of air compressor malfunctions and improves maintenance efficiency.

[0054] The above description only discloses specific embodiments of the present utility model, but the protection scope of the present utility model is not limited thereto. Any changes or modifications that can be easily conceived by those skilled in the art within the technical scope disclosed in the present utility model should be included within the protection scope of the present utility model.

Claims

1. An air compressor status detection circuit, characterized in that, The status detection circuit includes a first detection module for detecting the simulated value of lubricating oil temperature, a second detection module for detecting the simulated value of intake air temperature, a third detection module for detecting the simulated value of exhaust air temperature, a fourth detection module for detecting the simulated value of air pressure inside the lubricating oil cylinder, a fifth detection module for detecting the simulated value of intake air pressure, a sixth detection module for detecting the simulated value of exhaust air pressure, a seventh detection module for detecting the simulated value of pressure after oil filter, an eighth detection module for detecting the simulated value of pressure after oil separator, a control module, a communication module, and a power supply module. The first detection module, the second detection module, the third detection module, the fourth detection module, the fifth detection module, the sixth detection module, the seventh detection module, and the eighth detection module are respectively connected to the control module. The control module is connected to the communication module, and the communication module is used to upload each detection data to the host computer.

2. The air compressor status detection circuit according to claim 1, characterized in that, The first detection module, the second detection module, the third detection module, the fourth detection module, the fifth detection module, the sixth detection module, the seventh detection module, and the eighth detection module each include a first protection circuit, an amplifier, a second protection circuit, and a corresponding parameter detection sensor connected in sequence, and the first protection circuit is connected to the control module.

3. The air compressor status detection circuit according to claim 1, characterized in that, The communication module includes a third protection circuit, a network transformer chip, a first surge arrester, a second surge arrester, and a connector; the third protection circuit is connected to the control module and the network transformer chip, the network transformer chip is connected to the first surge arrester and the second surge arrester, and the first surge arrester and the second surge arrester are connected to the connector.

4. The air compressor status detection circuit according to claim 1, characterized in that, The power module includes a fourth protection circuit, a first filter circuit, a DC-DC chip, a fifth protection circuit, a second filter circuit, an LDO chip, and a third filter circuit connected in sequence.

5. The air compressor status detection circuit according to claim 1, characterized in that, The status detection circuit further includes a ninth detection module for detecting the switching quantity of lubricating oil temperature, a tenth detection module for detecting the switching quantity of air pressure in the lubricating oil cylinder, an eleventh detection module for detecting the switching quantity of exhaust pressure, and a twelfth detection module for detecting the air compressor start signal; the ninth, tenth, eleventh, and twelfth detection modules are respectively connected to the control module.

6. The air compressor status detection circuit according to claim 5, characterized in that, The ninth, tenth, eleventh, and twelfth detection modules each include a first optocoupler chip, a corresponding switch quantity detection sensor, and a corresponding status switch; the status switch is connected to the switch quantity detection sensor, and the switch quantity detection sensor is connected to the control module through the first optocoupler chip.

7. The air compressor status detection circuit according to claim 1, characterized in that, The state detection circuit further includes a switch control circuit, which includes a second optocoupler chip, a switch chip, and a control switch; the control switch is controlled by the switch chip, and the switch chip is connected to the control module through the second optocoupler chip; the control switch is connected to the load.

8. The air compressor status detection circuit according to any one of claims 1 to 7, characterized in that, The status detection circuit also includes a storage circuit, which is connected to the control module.

9. An air compressor, characterized in that, The air compressor includes an air compressor status detection circuit as described in any one of claims 1 to 8.

10. A rail train, characterized in that, The railcar includes the air compressor as described in claim 9.

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