Device for detecting running state of lubricating oil pump

Abstract

The utility model relates to the technical field of power systems, and provides a lubricating oil pump running state detection device which comprises a sampling circuit, an amplifying circuit, a comparison circuit and a first prompt circuit. The sampling circuit is connected with the lubricating oil pump in series and used for generating sampling voltage according to power supply current of the lubricating oil pump. The amplifying circuit is connected with the sampling circuit and is used for amplifying the sampling voltage to obtain amplified voltage; the comparison circuit is connected with the amplification circuit and is used for comparing the amplification voltage with reference voltage to generate a comparison signal; the first prompting circuit is connected with the comparison circuit and used for prompting the operation state of the lubricating oil pump according to the comparison signal and prompting operation and maintenance personnel to overhaul the lubricating oil pump and recover supply of lubricating grease in time, and the situation that due to poor lubrication of the generator, abnormal sound or damage of the generator is caused is avoided.

Description

Technical Field

[0001] The present disclosure relates to the technical field of electric power systems, and in particular to a device for detecting the operating status of a lubricating oil pump. Background Art

[0002] The generator lubrication system of a wind turbine is a key component of the wind turbine, and is of great significance for ensuring the stable operation and extending the service life of the generator. The generator lubrication system of a wind turbine is mainly composed of four basic parts: a lubricating oil pump, a distributor, a pipeline assembly, and a control system. The system supplies lubricating oil to one or more lubrication points in the generator in a timely and quantitative manner from a lubricating oil supply source through oil metering components and some distributor distribution pipelines to meet the generator's lubrication needs, thereby effectively reducing the friction loss generated during its operation.

[0003] In the related technology, the operation and maintenance personnel cannot timely discover the operating status of the lubricating oil pump and fail to supply lubricating grease in time, resulting in poor lubrication of the generator, and then abnormal noise or damage to the generator. Utility Model Content

[0004] The purpose of the present disclosure is to provide a device for detecting the operating status of a lubricating oil pump to solve the problems in the related art.

[0005] In order to achieve the above-mentioned object, the present disclosure provides a lubricating oil pump operating state detection device, comprising: a sampling circuit, an amplifying circuit, a comparing circuit and a first prompting circuit;

[0006] The sampling circuit is arranged in series with the lubricating oil pump and is used to generate a sampling voltage according to the power supply current of the lubricating oil pump;

[0007] The amplifying circuit is connected to the sampling circuit and is used to amplify the sampling voltage to obtain an amplified voltage;

[0008] The comparison circuit is connected to the amplifier circuit and is used to compare the amplified voltage with a reference voltage to generate a comparison signal;

[0009] The first prompt circuit is connected to the comparison circuit and is used to prompt the operating status of the lubricating oil pump according to the comparison signal.

[0010] Optionally, the first prompt circuit includes: a first resistor and a light emitting diode;

[0011] A first end of the first resistor is connected to a first voltage source, a second end of the first resistor is connected to an anode of the light emitting diode, and a cathode of the light emitting diode is connected to an output end of the comparison circuit.

[0012] Optionally, the lubricating oil pump operating state detection device further comprises: a reference circuit;

[0013] The reference circuit is connected to the input terminal of the comparison circuit and is used to provide the reference voltage to the comparison circuit.

[0014] Optionally, the reference circuit includes: a second resistor, a third resistor and an adjustable resistor;

[0015] The first end of the adjustable resistor is connected to a first voltage source, the second end of the adjustable resistor is grounded, the adjustment end of the adjustable resistor is connected to the first end of the second resistor, the second end of the second resistor is connected to the input end of the comparison circuit, the first end of the third resistor is connected to the input end of the comparison circuit, and the second end of the third resistor is connected to the output end of the comparison circuit.

[0016] Optionally, the amplification circuit includes: a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, a first capacitor, a second capacitor and an operational amplifier, and the sampling circuit includes a sampling resistor;

[0017] The first end of the fourth resistor is connected to the first end of the sampling resistor, the second end of the fourth resistor is connected to the first end of the fifth resistor, the first end of the sixth resistor is connected to the second end of the sampling resistor, the second end of the sixth resistor is connected to the first end of the seventh resistor, the first end of the first capacitor is connected to the second end of the fourth resistor, and the second end of the first capacitor is connected to the second end of the sixth resistor;

[0018] The first end of the eighth resistor is connected to the second voltage source, the second end of the eighth resistor is connected to the non-inverting input terminal of the operational amplifier, the second end of the fifth resistor is connected to the non-inverting input terminal of the operational amplifier, the second end of the seventh resistor is connected to the inverting input terminal of the operational amplifier, the first end of the ninth resistor is connected to the inverting input terminal of the operational amplifier, and the second end of the ninth resistor is connected to the output terminal of the operational amplifier;

[0019] The output end of the operational amplifier is connected to the first end of the tenth resistor, the second end of the tenth resistor is connected to the first end of the second capacitor, the second end of the tenth resistor is connected to the comparison circuit, and the second end of the second capacitor is grounded.

[0020] Optionally, the lubricating oil pump operating state detection device further comprises: a first voltage conversion circuit;

[0021] The first voltage conversion circuit is connected to the amplifier circuit, and is used to convert the voltage of the first voltage source into the second voltage source to provide power to the amplifier circuit.

[0022] Optionally, the first voltage conversion circuit includes: an eleventh resistor, a twelfth resistor, a third capacitor and a first comparator;

[0023] The first end of the eleventh resistor is connected to the first voltage source, the second end of the eleventh resistor is connected to the first end of the twelfth resistor, the second end of the twelfth resistor is grounded, the second end of the eleventh resistor is connected to the non-inverting input of the first comparator, the inverting input of the first comparator is connected to the output of the first comparator, the first end of the third capacitor is connected to the output of the first comparator, the second end of the third capacitor is grounded, and the output of the first comparator is connected to the amplifier circuit.

[0024] Optionally, the lubricating oil pump operating state detection device further comprises: a second voltage conversion circuit;

[0025] The second voltage conversion circuit is connected to the first prompt circuit, and is used for performing voltage conversion on the voltage of the third voltage source and then providing power supply to the first prompt circuit.

[0026] Optionally, the lubricating oil pump operating status detection device further includes: a controller and a power supply control circuit;

[0027] The power control circuit is connected to the controller, and the power control circuit is connected to the second voltage conversion circuit, and is used to control the voltage supply state of the third voltage source according to the control signal sent by the controller.

[0028] Optionally, the power control circuit includes: a thirteenth resistor, a fourteenth resistor, a transistor, a rectifier diode and a relay;

[0029] The first end of the thirteenth resistor is connected to the controller, the second end of the thirteenth resistor is connected to the base of the transistor, the first end of the fourteenth resistor is connected to the second end of the thirteenth resistor, the second end of the fourteenth resistor and the emitter of the transistor are grounded, the collector of the transistor is connected to the first coil interface of the relay, the second coil interface of the relay is used to connect to a power supply, the common port of the relay is connected to the third voltage source, the contact port of the relay is connected to the second voltage conversion circuit, the anode of the rectifier diode is connected to the first coil interface of the relay, and the cathode of the rectifier diode is connected to the second coil interface of the relay.

[0030] Optionally, the lubricating oil pump operating status detection device further comprises: a controller and a second prompt circuit;

[0031] The controller is connected to the second prompt circuit, and the controller is connected to the comparison circuit, and is used for controlling the second prompt circuit to prompt the operating status of the lubricating oil pump according to the comparison signal.

[0032] By adopting the above technical scheme, a sampling voltage is generated by a sampling circuit arranged in series with the lubricating oil pump, the amplifying circuit is used to amplify the sampling voltage to obtain an amplified voltage, the comparing circuit is used to compare the amplified voltage with a reference voltage to generate a comparison signal, and the first prompting circuit is used to indicate the operating status of the lubricating oil pump according to the comparison signal and promptly prompt the operation and maintenance personnel to inspect the lubricating oil pump and restore the supply of lubricating grease to avoid abnormal noise or damage to the generator due to poor lubrication of the generator.

[0033] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0035] Figure 1 It is a block diagram of a device for detecting the operating status of a lubricating oil pump according to an exemplary embodiment.

[0036] Figure 2 It is a partial circuit diagram of a device for detecting the operating status of a lubricating oil pump according to an exemplary embodiment.

[0037] Figure 3 is a circuit diagram of an amplifier circuit according to an exemplary embodiment.

[0038] Figure 4 is a circuit diagram of a first voltage conversion circuit according to an exemplary embodiment.

[0039] Figure 5 is a circuit diagram of a second voltage conversion circuit according to an exemplary embodiment.

[0040] Figure 6 is a circuit diagram of a power control circuit according to an exemplary embodiment.

[0041] Figure 7 is a circuit diagram of a reset circuit according to an exemplary embodiment.

[0042] Description of Reference Numerals

[0043] 11-sampling circuit, 12-amplifying circuit, 13-comparison circuit, 14-first prompt circuit, 15-reference circuit, 16-first voltage conversion circuit, 17-second voltage conversion circuit, 18-controller, 19-power control circuit, 20-second prompt circuit, R0-sampling resistor, R1-first resistor, R2-second resistor, R3-third resistor, R4-fourth resistor, R5-fifth resistor, R6-sixth resistor, R7-seventh resistor, R8-eighth resistor, R9-ninth resistor, R10-tenth resistor, R11-eleventh resistor, R12-twelfth resistor, R13-thirteenth resistor, R14-fourteenth resistor, R15-fifteenth resistor, R16-sixteenth resistor Resistor, R17-the seventeenth resistor, R18-the eighteenth resistor, R19-the nineteenth resistor, C1-the first capacitor, C2-the second capacitor, C3-the third capacitor, C4-the fourth capacitor, C5-the fifth capacitor, C6-the sixth capacitor, C7-the seventh capacitor, C8-the eighth capacitor, C9-the ninth capacitor, C10-the tenth capacitor, C11-the eleventh capacitor, D1-light emitting diode, Rx-adjustable resistor, COMP1-the first comparator, COMP2-the second comparator, OP-operational amplifier, L1-inductor, D3-the first diode, D4-the second diode, U1-step-down regulator, Q1-transistor, D2-rectifier diode, K1-relay, S1-reset button. DETAILED DESCRIPTION

[0044] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0045] In the description below, words such as “first” and “second” are only used for the purpose of distinguishing the description and should not be understood as indicating or implying relative importance or order.

[0046] The generator lubrication system of a wind turbine is a key component of the wind turbine, and is of great significance for ensuring the stable operation and extending the service life of the generator. The generator lubrication system of a wind turbine is mainly composed of four basic parts: a lubricating oil pump, a distributor, a pipeline assembly, and a control system. The system supplies lubricating oil to one or more lubrication points in the generator in a timely and quantitative manner from a lubricating oil supply source through oil metering components and some distributor distribution pipelines to meet the generator's lubrication needs, thereby effectively reducing the friction loss generated during its operation.

[0047] In the related technology, the operation and maintenance personnel cannot timely discover the operating status of the lubricating oil pump and fail to supply lubricating grease in time, resulting in poor lubrication of the generator, and then abnormal noise or damage to the generator.

[0048] In order to solve the above technical problems, a sampling voltage is generated by a sampling circuit arranged in series with the lubricating oil pump, the amplifying circuit is used to amplify the sampling voltage to obtain an amplified voltage, the comparison circuit is used to compare the amplified voltage with a reference voltage to generate a comparison signal, and the first prompt circuit is used to prompt the operating status of the lubricating oil pump according to the comparison signal and promptly prompt the operation and maintenance personnel to inspect the lubricating oil pump and restore the supply of lubricating grease to avoid abnormal noise or damage to the generator due to poor lubrication of the generator.

[0049] Figure 1 FIG. 1 is a block diagram of a device for detecting the operating state of a lubricating oil pump according to an exemplary embodiment. Figure 1 As shown, the lubricating oil pump operating state detection device may include: a sampling circuit 11, an amplifying circuit 12, a comparing circuit 13 and a first prompting circuit 14.

[0050] The sampling circuit 11 is arranged in series with the lubricating oil pump, and is used to generate a sampling voltage according to the power supply current of the lubricating oil pump.

[0051] The sampling circuit 11 can be a sampling resistor, which is connected in series with the lubricating oil pump. The current flowing through the sampling resistor is the same as the power supply current of the lubricating oil pump. When the lubricating oil pump is working, there is a power supply current, so a sampling voltage is formed at both ends of the sampling resistor. The sampling voltage is positively correlated with the actual working voltage of the lubricating oil pump, that is, the greater the actual working voltage of the lubricating oil pump, the greater the sampling voltage.

[0052] Sampling voltage = current flowing through the sampling resistor * resistance of the sampling resistor = power supply current * resistance of the sampling resistor.

[0053] The amplifier circuit 12 is connected to the sampling resistor and is used to amplify the sampled voltage to obtain an amplified voltage.

[0054] In order to avoid affecting the normal operation of the lubricating oil pump, the resistance of the sampling resistor is usually low, resulting in a relatively small sampling voltage. The sampling voltage is amplified by setting an amplifier circuit 12 to obtain an amplified voltage, thereby achieving more precise control and regulation.

[0055] The comparison circuit 13 is connected to the amplifier circuit 12 and is used to compare the amplified voltage with a reference voltage to generate a comparison signal.

[0056] The amplified voltage and the reference voltage are input to the two input terminals of the comparison circuit 13 respectively. The comparison circuit 13 compares the amplified voltage and the reference voltage. When the amplified voltage is greater than the reference voltage, a first level signal is output, which can indicate that there is a power supply current in the lubricating oil pump and the power supply current is greater than or equal to the normal working current. When the amplified voltage is less than or equal to the reference voltage, a second level signal is output, which can indicate that there is no power supply current in the lubricating oil pump or the power supply current is lower than the normal working current.

[0057] The first prompting circuit 14 is connected to the comparison circuit 13 and is used for prompting the operating state of the lubricating oil pump according to the comparison signal.

[0058] When the comparison signal is a first level signal, the first prompt circuit 14 prompts in a first prompting manner that the operation state of the lubricating oil pump is normal; when the comparison signal is a second level signal, the first prompt circuit 14 prompts in a second prompting manner that the operation state of the lubricating oil pump is abnormal.

[0059] It should be understood that the first prompt circuit 14 can be a sound, light, vibration, etc. to prompt the operation and maintenance personnel. Correspondingly, the first prompt circuit 14 may include a buzzer, a light emitting diode D1 (LED), a vibrator, etc. The first prompt mode may be sound, light on, vibration, etc., and the second prompt mode may be no sound, light off, no vibration, etc. In other embodiments, the first prompt mode may be a first sound, and the second prompt mode may be a second sound; or, the first prompt mode may be a light of a first color, and the second prompt mode may be a light of a second color; or, the first prompt mode may be a vibration of a first vibration frequency, and the second prompt mode may be a vibration of a second vibration frequency, etc.

[0060] A sampling voltage is generated by a sampling circuit 11 which is arranged in series with the lubricating oil pump. The amplifier circuit 12 is used to amplify the sampling voltage to obtain an amplified voltage. The comparison circuit 13 is used to compare the amplified voltage with a reference voltage to generate a comparison signal. The first prompt circuit 14 is used to prompt the operating status of the lubricating oil pump according to the comparison signal and promptly prompt the operation and maintenance personnel to inspect the lubricating oil pump and restore the supply of lubricating grease to avoid abnormal noise or damage to the generator due to poor lubrication of the generator.

[0061] In a possible implementation, the first prompt circuit 14 prompts the operation and maintenance personnel in the form of light. Figure 2 The first prompt circuit 14 may include: a first resistor R1 and a light emitting diode D1.

[0062] A first end of the first resistor R1 is connected to a first voltage source, a second end of the first resistor R1 is connected to an anode of the light emitting diode D1 , and a cathode of the light emitting diode D1 is connected to an output end of the comparison circuit 13 .

[0063] When the comparison signal output by the comparison circuit 13 is a low-level signal, the first voltage source sequentially passes through the first resistor R1 and the light-emitting diode D1, so that the light-emitting diode D1 is turned on and emits light. Correspondingly, when the comparison signal output by the comparison circuit 13 is a high-level signal, the first voltage source cannot form a voltage drop across the light-emitting diode D1 through the first resistor R1, and the light-emitting diode D1 cannot emit light.

[0064] For example, the first level signal is a low level signal, and the second level signal is a high level signal. The LED D1 is turned on and emits light, indicating that the operation state of the lubricating oil pump is normal, and the LED D1 is not lit, indicating that the operation state of the lubricating oil pump is abnormal. The voltage of the first voltage source can be 5V.

[0065] In one possible implementation, please refer to Figure 1 , the lubricating oil pump operating state detection device may further include: a reference circuit 15;

[0066] The reference circuit 15 is connected to the input terminal of the comparison circuit 13 and is used for providing a reference voltage to the comparison circuit 13 .

[0067] Please continue reading Figure 2 , the reference circuit 15 may include: a second resistor R2, a third resistor R3 and an adjustable resistor Rx.

[0068] A first end of the adjustable resistor Rx is connected to a first voltage source, a second end of the adjustable resistor Rx is grounded, an adjustment end of the adjustable resistor Rx is connected to a first end of a second resistor R2, a second end of the second resistor R2 is connected to an input end of a comparison circuit 13, a first end of a third resistor R3 is connected to an input end of the comparison circuit 13, and a second end of the third resistor R3 is connected to an output end of the comparison circuit 13.

[0069] By adjusting the adjustable resistor Rx, the reference voltage provided to the comparison circuit 13 can be adjusted.

[0070] By way of example, the comparison circuit 13 may include a second comparator COMP2, the second end of the second resistor R2 is connected to the non-inverting input end of the second comparator COMP2, a reference voltage is provided through the second end of the second resistor R2, and the inverting input end of the second comparator COMP2 is connected to the output end of the amplifier circuit 12 to receive the amplified voltage.

[0071] In other embodiments, the comparison circuit 13 may further include a fifteenth resistor R15 and a fourth capacitor C4, the amplifier circuit 12 is connected to the first end of the fifteenth resistor R15, the second end of the fifteenth resistor R15 is connected to the inverting input end of the second comparator COMP2, the first end of the fourth capacitor C4 is grounded, and the second end of the fourth capacitor C4 is connected to the inverting input end of the second comparator COMP2. The model of the second comparator COMP2 may be LMV331.

[0072] In one possible implementation, see Figure 3The amplification circuit 12 may include: a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, a first capacitor C1, a second capacitor C2 and an operational amplifier OP, and the sampling circuit 11 may include a sampling resistor R0.

[0073] A first end of the fourth resistor R4 is connected to a first end of the sampling resistor R0, a second end of the fourth resistor R4 is connected to a first end of the fifth resistor R5, a first end of the sixth resistor R6 is connected to a second end of the sampling resistor R0, and the first end of the sixth resistor R6 and the second end of the sampling resistor R0 are both grounded, a second end of the sixth resistor R6 is connected to a first end of the seventh resistor R7, a first end of the first capacitor C1 is connected to a second end of the fourth resistor R4, and a second end of the first capacitor C1 is connected to a second end of the sixth resistor R6; a first end of the eighth resistor R8 is connected to a second voltage source, a second end of the eighth resistor R8 is connected to a non-inverting input end of the operational amplifier OP, a second end of the fifth resistor R5 is connected to a non-inverting input end of the operational amplifier OP, a second end of the seventh resistor R7 is connected to an inverting input end of the operational amplifier OP, a first end of the ninth resistor R9 is connected to an inverting input end of the operational amplifier OP, and a second end of the ninth resistor R9 is connected to an output end of the operational amplifier OP; an output end of the operational amplifier OP is connected to a first end of a tenth resistor R10, a second end of the tenth resistor R10 is connected to a first end of the second capacitor C2, a second end of the tenth resistor R10 is connected to a comparison circuit 13, and a second end of the second capacitor C2 is grounded.

[0074] By way of example, the voltage of the second voltage source may be 0.8V, and the model of the operational amplifier OP may be MAX44248.

[0075] In one possible implementation, please refer to Figure 1 , the lubricating oil pump operating state detection device may further include: a first voltage conversion circuit 16;

[0076] The first voltage conversion circuit 16 is connected to the amplifier circuit 12 and is used for performing voltage conversion on the voltage of the first voltage source and providing power to the amplifier circuit 12 as a second voltage source.

[0077] For example, the voltage of the first voltage source is 5V, and the voltage of the second voltage source is 0.8V. The first voltage conversion circuit 16 converts the voltage of the first voltage source to obtain the voltage of the second voltage source and provides it to the amplifier circuit 12 .

[0078] In one possible implementation, see Figure 4 , the first voltage conversion circuit 16 may include: an eleventh resistor R11, a twelfth resistor R12, a third capacitor C3 and a first comparator COMP1.

[0079] A first end of the eleventh resistor R11 is connected to the first voltage source, a second end of the eleventh resistor R11 is connected to a first end of the twelfth resistor R12, a second end of the twelfth resistor R12 is grounded, a second end of the eleventh resistor R11 is connected to a non-inverting input of the first comparator COMP1, an inverting input of the first comparator COMP1 is connected to an output of the first comparator COMP1, a first end of the third capacitor C3 is connected to the output of the first comparator COMP1, a second end of the third capacitor C3 is grounded, and the output of the first comparator COMP1 is connected to the amplifier circuit 12.

[0080] By way of example, the model of the first comparator COMP1 may be MAX44248.

[0081] In one possible implementation, please refer to Figure 1 , the lubricating oil pump operating state detection device may further include: a second voltage conversion circuit 17;

[0082] The second voltage conversion circuit 17 is connected to the first prompt circuit 14 and is used for converting the voltage of the third voltage source and then providing power supply to the first prompt circuit 14 .

[0083] See also Figure 5 The second voltage conversion circuit 17 may include: an inductor L1, a first diode D3, a second diode D4, a fifth capacitor C5, a sixth capacitor C6, a seventh capacitor C7, an eighth capacitor C8, a ninth capacitor C9, a tenth capacitor C10, an eleventh capacitor C11, a sixteenth resistor R16, a seventeenth resistor R17, an eighteenth resistor R18 and a buck regulator U1.

[0084] The anode of the first diode D3 is connected to the third voltage source, the cathode of the first diode D3 is connected to the first end of the fifth capacitor C5, the first end of the sixth capacitor C6, and the first end of the seventh capacitor C7, and the second end of the fifth capacitor C5, the second end of the sixth capacitor C6, and the second end of the seventh capacitor C7 are all grounded. A first end of the seventh capacitor C7 is connected to the input terminal VIN of the buck regulator U1, a first end of the sixteenth resistor R16 is connected to the first end of the seventh capacitor C7, a second end of the sixteenth resistor R16 is connected to the enable terminal EN of the buck regulator U1, a switch control terminal SW of the buck regulator U1 is connected to the cathode of the second diode D4, an anode of the second diode D4 is grounded, and the switch control terminal SW of the buck regulator U1 is connected to the first end of the eighth capacitor C8, a second end of the eighth capacitor C8 is connected to the self-boosting terminal BST of the buck regulator U1, a first end of the inductor L1 is connected to the switch control terminal SW of the buck regulator U1, a second end of the inductor L1 is connected to the first end of the seventeenth resistor R17, a first end of the seventeenth resistor R17 is connected to the first end of the eighteenth resistor R18, a second end of the eighteenth resistor R18 is grounded, a second end of the seventeenth resistor R17 is connected to the output voltage feedback terminal FB of the buck regulator U1, and a ground terminal of the buck regulator U1 is grounded. The first end of the ninth capacitor C9, the first end of the tenth capacitor C10, and the first end of the eleventh capacitor C11 are all connected to the first end of the seventeenth resistor R17, the second end of the ninth capacitor C9, the second end of the tenth capacitor C10, and the second end of the eleventh capacitor C11 are all grounded, and the first end of the eleventh capacitor C11 is connected to the first prompt circuit 14.

[0085] For example, the first diode D3 and the second diode D4 may both be Schottky diodes, and the model of the buck regulator U1 may be ME3116AM6G.

[0086] In one possible implementation, please refer to Figure 1 , the lubricating oil pump operating state detection device may also include: a controller 18 and a power supply control circuit 19;

[0087] The power control circuit 19 is connected to the controller 18 , and the power control circuit 19 is connected to the second voltage conversion circuit 17 , and is used to control the voltage supply state of the third voltage source according to the control signal sent by the controller 18 .

[0088] For example, when the control signal sent by the controller 18 is a first control signal, the voltage of the third voltage source is controlled to be supplied to the second voltage conversion circuit 17 for voltage conversion; when the control signal sent by the controller 18 is a second control signal, the voltage of the third voltage source is controlled not to be supplied to the second voltage conversion circuit 17.

[0089] By way of example, the first control signal is a high-level control signal, and the second control signal is a low-level control signal.

[0090] In one possible implementation, see Figure 6 The power control circuit 19 may include: a thirteenth resistor R13, a fourteenth resistor R14, a transistor Q1, a rectifier diode D2 and a relay K1.

[0091] The first end of the thirteenth resistor R13 is connected to the controller 18, the second end of the thirteenth resistor R13 is connected to the base of the transistor Q1, the first end of the fourteenth resistor R14 is connected to the second end of the thirteenth resistor R13, the second end of the fourteenth resistor R14 and the emitter of the transistor Q1 are grounded, the collector of the transistor Q1 is connected to the first coil interface of the relay K1, the second coil interface of the relay K1 is used to connect to the power supply VCC, the common port of the relay K1 is connected to the third voltage source, the contact port of the relay K1 is connected to the second voltage conversion circuit 17, the anode of the rectifier diode D2 is connected to the first coil interface of the relay K1, and the cathode of the rectifier diode D2 is connected to the second coil interface of the relay K1.

[0092] For example, the voltage of the third voltage source may be 24 V. The control signal sent by the controller 18 is transmitted to the base of the transistor Q1 through the thirteenth resistor R13. When the control signal is a high-level control signal, the transistor Q1 is turned on, the coil in the relay K1 is energized, the relay K1 is closed, and the voltage of the third voltage source is given to the second voltage conversion circuit 17.

[0093] In one possible implementation, please refer to Figure 1 , the lubricating oil pump operating state detection device may further include: a controller 18 and a second prompt circuit 20;

[0094] The controller 18 is connected to the second prompt circuit 20 , and the controller 18 is connected to the comparison circuit 13 , and is used to control the second prompt circuit 20 to prompt the operating status of the lubricating oil pump according to the comparison signal.

[0095] The second prompt circuit 20 can prompt the operation and maintenance personnel in the form of sound, light, vibration, etc. Correspondingly, the second prompt circuit 20 can include a buzzer, an LED, a vibrator, etc.

[0096] The second prompt circuit 20 may have the same prompt mode as the first prompt circuit 14 or may have a different prompt mode from the first prompt circuit 14, which is not limited in this embodiment.

[0097] When the first prompt circuit 14 fails, the controller 18 and the second prompt circuit 20 can also prompt the operating status of the lubricating oil pump, thereby improving the working stability of the lubricating oil pump operating status detection device.

[0098] In other embodiments, the controller 18 can also count the duration of the comparison signal of the comparison circuit 13 being the first level signal, and when the duration is longer than a preset duration, control the second prompt circuit 20 to prompt the operating status of the lubricating oil pump. The current of the lubricating oil pump during operation can be monitored once every 24 hours, and when the current is maintained for 10 seconds, it is judged that the operating status of the lubricating oil pump is normal. In this way, the accuracy and reliability of judging the operating status of the lubricating oil pump can be improved.

[0099] In other embodiments, the lubricating oil pump operating state detection device may further include: a controller 18 and an alarm circuit. The controller 18 is connected to the alarm circuit, and the controller 18 is connected to the comparison circuit 13, and is used to control the alarm circuit to alarm according to the comparison signal.

[0100] When the controller 18 receives the comparison signal as the second level signal, it indicates that the operation state of the lubricating oil pump is abnormal, and an alarm may be issued through the alarm circuit. The alarm circuit may also issue an alarm when the power supply current of the lubricating oil pump is not detected within a monitoring cycle.

[0101] In other embodiments, the lubricating oil pump operating state detection device may further include: a controller 18 , a reset circuit, and a switch connected in series with the sampling circuit 11 .

[0102] The switch and reset circuit are connected to the controller 18, see Figure 7 The reset circuit may include a nineteenth resistor R19 and a reset button S1, the first end of the nineteenth resistor R19 is connected to the first voltage source, the second end of the nineteenth resistor R19 is connected to the first end of the reset button S1, the second end of the nineteenth resistor R19 is connected to the controller 18, and the second end of the reset button S1 is grounded.

[0103] When an abnormality is detected, the reset button S1 is pressed, and the controller 18 controls the switch arranged in series with the sampling circuit 11 to be disconnected, and the current of the lubricating oil pump is no longer detected, that is, the operating status of the lubricating oil pump is stopped to facilitate maintenance by the operation and maintenance personnel.

[0104] It should be understood that the controller 18 may be a single chip microcomputer. For example, the model of the single chip microcomputer may be STC8H1K08.

[0105] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0106] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0107] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A device for detecting the operating status of a lubricating oil pump, characterized in that: include: A sampling circuit, an amplifying circuit, a comparing circuit and a first prompting circuit; The sampling circuit is arranged in series with the lubricating oil pump and is used to generate a sampling voltage according to the power supply current of the lubricating oil pump; The amplifying circuit is connected to the sampling circuit and is used to amplify the sampling voltage to obtain an amplified voltage; The comparison circuit is connected to the amplifier circuit and is used to compare the amplified voltage with a reference voltage to generate a comparison signal; The amplification circuit includes: a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, a first capacitor, a second capacitor and an operational amplifier, and the sampling circuit includes a sampling resistor; The first end of the fourth resistor is connected to the first end of the sampling resistor, the second end of the fourth resistor is connected to the first end of the fifth resistor, the first end of the sixth resistor is connected to the second end of the sampling resistor, the second end of the sixth resistor is connected to the first end of the seventh resistor, the first end of the first capacitor is connected to the second end of the fourth resistor, and the second end of the first capacitor is connected to the second end of the sixth resistor; The first end of the eighth resistor is connected to the second voltage source, the second end of the eighth resistor is connected to the non-inverting input terminal of the operational amplifier, the second end of the fifth resistor is connected to the non-inverting input terminal of the operational amplifier, the second end of the seventh resistor is connected to the inverting input terminal of the operational amplifier, the first end of the ninth resistor is connected to the inverting input terminal of the operational amplifier, and the second end of the ninth resistor is connected to the output terminal of the operational amplifier; The output end of the operational amplifier is connected to the first end of the tenth resistor, the second end of the tenth resistor is connected to the first end of the second capacitor, the second end of the tenth resistor is connected to the comparison circuit, and the second end of the second capacitor is grounded; The first prompt circuit is connected to the comparison circuit, and is used to prompt the operating status of the lubricating oil pump according to the comparison signal.

2. The lubricating oil pump operating status detection device according to claim 1, characterized in that: The first prompt circuit includes: a first resistor and a light emitting diode; A first end of the first resistor is connected to a first voltage source, a second end of the first resistor is connected to an anode of the light emitting diode, and a cathode of the light emitting diode is connected to an output end of the comparison circuit.

3. The lubricating oil pump operating status detection device according to claim 1, characterized in that: The lubricating oil pump operating state detection device further comprises: a reference circuit; The reference circuit is connected to the input terminal of the comparison circuit and is used to provide the reference voltage to the comparison circuit.

4. The lubricating oil pump operating status detection device according to claim 3, characterized in that: The reference circuit comprises: a second resistor, a third resistor and an adjustable resistor; The first end of the adjustable resistor is connected to a first voltage source, the second end of the adjustable resistor is grounded, the adjustment end of the adjustable resistor is connected to the first end of the second resistor, the second end of the second resistor is connected to the input end of the comparison circuit, the first end of the third resistor is connected to the input end of the comparison circuit, and the second end of the third resistor is connected to the output end of the comparison circuit.

5. The lubricating oil pump operating status detection device according to claim 1, characterized in that: The lubricating oil pump operating state detection device further includes: a first voltage conversion circuit; The first voltage conversion circuit is connected to the amplifier circuit, and is used to convert the voltage of the first voltage source into the second voltage source to provide power to the amplifier circuit.

6. The lubricating oil pump operating status detection device according to claim 5, characterized in that: The first voltage conversion circuit includes: an eleventh resistor, a twelfth resistor, a third capacitor and a first comparator; The first end of the eleventh resistor is connected to the first voltage source, the second end of the eleventh resistor is connected to the first end of the twelfth resistor, the second end of the twelfth resistor is grounded, the second end of the eleventh resistor is connected to the non-inverting input of the first comparator, the inverting input of the first comparator is connected to the output of the first comparator, the first end of the third capacitor is connected to the output of the first comparator, the second end of the third capacitor is grounded, and the output of the first comparator is connected to the amplifier circuit.

7. The lubricating oil pump operating status detection device according to claim 1, characterized in that: The lubricating oil pump operating state detection device further includes: a second voltage conversion circuit; The second voltage conversion circuit is connected to the first prompt circuit, and is used for performing voltage conversion on the voltage of the third voltage source and then providing power supply to the first prompt circuit.

8. The lubricating oil pump operating status detection device according to claim 7, characterized in that: The lubricating oil pump operating state detection device also includes: a controller and a power supply control circuit; The power control circuit is connected to the controller, and the power control circuit is connected to the second voltage conversion circuit, and is used to control the voltage supply state of the third voltage source according to the control signal sent by the controller.

9. The lubricating oil pump operating status detection device according to claim 8, characterized in that: The power supply control circuit comprises: a thirteenth resistor, a fourteenth resistor, a triode, a rectifier diode and a relay; The first end of the thirteenth resistor is connected to the controller, the second end of the thirteenth resistor is connected to the base of the transistor, the first end of the fourteenth resistor is connected to the second end of the thirteenth resistor, the second end of the fourteenth resistor and the emitter of the transistor are grounded, the collector of the transistor is connected to the first coil interface of the relay, the second coil interface of the relay is used to connect to a power supply, the common port of the relay is connected to the third voltage source, the contact port of the relay is connected to the second voltage conversion circuit, the anode of the rectifier diode is connected to the first coil interface of the relay, and the cathode of the rectifier diode is connected to the second coil interface of the relay.

10. The lubricating oil pump operating status detection device according to claim 1, characterized in that: The lubricating oil pump operating state detection device further comprises: a controller and a second prompt circuit; The controller is connected to the second prompt circuit, and the controller is connected to the comparison circuit, and is used to control the second prompt circuit to prompt the operating status of the lubricating oil pump according to the comparison signal.

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