Coupling power hydraulic power generation system and fault monitoring method

Abstract

The invention provides a coupling power hydraulic power generation system and a fault monitoring method, and belongs to the technical field of power generation in a coal mine. The power generation system comprises a pressure reduction unit, and the pressure reduction unit is used for reducing the pressure intensity and flow of high-pressure liquid to preset values; the power coupling unit is connected with the pressure reduction unit and used for converting hydraulic energy into mechanical energy and driving the power generation unit. The power generation unit is connected with the power coupling unit and the energy storage unit and used for generating power through mechanical energy. The energy storage unit is used for storing the electric energy generated by the power generation unit; the monitoring unit is connected with the energy storage unit and the power generation unit and used for monitoring the voltage and electric quantity of the energy storage unit and the rotating speeds of the power generation unit and the power coupling unit. According to the hydraulic power generation device, liquid inlet is continuous and controllable, the size is small, hydraulic power generation is conducted on the fully mechanized coal mining face through emulsion, stable output of the power generation efficiency is ensured, hydraulic on-off is automatically adjusted through the monitoring unit, the energy loss is greatly reduced, and the power generation efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of power generation in coal mines, and particularly to a coupled power hydraulic power generation system and a fault monitoring method. Background Art

[0002] In recent years, with the state successively issuing a number of policy documents, guiding opinions have been put forward for the automation, informatization, digitization, and intelligent development of coal mines, pointing out the direction for the intelligent development of coal mines. The reduction and even elimination of personnel in fully mechanized coal mining faces are the top priorities for future development. According to the power supply regulations in the coal industry, the high-voltage power supply specifications in the coal industry are 1140V, 660V, and 127V. For explosion-proof and intrinsically safe requirements, the power supply requirements for the controllers and all sensor devices in the fully mechanized coal mining face are 12V for operation, which leads to the conversion of AC and DC between the controller and the power supply device through a power conversion module. Since the input is 127VAC, and even 660VAC in some cases, there is a risk of explosion in the entire fully mechanized coal mining face. This results in a heavy protective shell for the power supply box and extremely high requirements for the processing level of the flameproof surface and the protection levels against water and dust. At the same time, it also restricts the improvement of the power supply power. With the continuous popularization of the automated fully mechanized coal mining face following the machine and the increasing length of the working face, more and more sensing devices such as cameras and integrated access devices are connected. On the one hand, this leads to an increase in the number of power supply modules, and on the other hand, there are frequent problems of insufficient power supply.

[0003] Currently, there are many technologies and products on the market for power generation through rotary mechanisms such as hydraulic motors and impellers, such as vehicle generators and hydroelectric power generation. However, there is no situation where high-pressure self-power generation is carried out through the incoming liquid of hydraulic supports in coal mine roadways or fully mechanized coal mining faces and is applied to the loads in the electro-hydraulic control systems of roadways or fully mechanized coal mining faces, such as controllers, solenoid valve drivers, and pressure sensors.

[0004] There is a related technology that uses a hydraulic energy-electric energy conversion unit to convert hydraulic shock, vibration, noise, and heat in the pipeline system into electric energy. Although self-power generation can be achieved, due to the limited energy of the system, the electric energy generated by this solution can only be used for the energy supply of solenoid valve drivers, and it cannot truly achieve a passive power supply system for the fully mechanized coal mining face. There is also a method of generating power by using the hydraulic medium in the low-pressure return liquid pipeline of the fully mechanized coal mining face system through a hydraulic motor. This power generation mode has a high complexity of system composition, the return liquid cannot be continuously and controllably regulated, the power generation is intermittent, and the volume of the power generation device is relatively large, which is not convenient for installation and use in thin coal seams. Summary of the Invention

[0005] To solve the deficiencies in the prior art, the present invention provides a coupled power hydraulic power generation system and a fault monitoring method.

[0006] The present invention adopts the following technical solutions:

[0007] On the one hand, the present invention provides a coupled power hydraulic power generation system, comprising: a pressure reduction unit, a power coupling unit, a power generation unit, an energy storage unit and a monitoring unit; the pressure reduction unit is used to reduce the pressure and flow rate of high-pressure liquid to a predetermined value as the power source of the power generation system; the power coupling unit is connected to the pressure reduction unit and is used to convert hydraulic energy into mechanical energy and drive the power generation unit; the power generation unit is respectively connected to the power coupling unit and the energy storage unit and is used to generate electricity by using mechanical energy; the energy storage unit is used to store the electric energy generated by the power generation unit; the monitoring unit is connected to the energy storage unit and the power generation unit and is used to monitor the voltage and power of the energy storage unit and the rotational speeds of the power generation unit and the power coupling unit.

[0008] According to the described coupled power hydraulic power generation system, the power generation system further comprises: an emulsion liquid system; the emulsion liquid system comprises an emulsion liquid pumping station, a filter, a pressure reduction unit, a power coupling unit and a main valve which are connected in sequence to form a loop; the main valve has not less than one passage; the emulsion liquid pumping station and the power coupling unit are connected through a main return pipeline; the emulsion liquid pumping station is connected to the main valve through a main inlet pipeline, one passage of the main valve is connected to the filter, and the filter is connected to the pressure reduction unit; the emulsion liquid system is used to provide a hydraulic medium.

[0009] According to the described coupled power hydraulic power generation system, the pressure reduction unit comprises: a pressure reduction unit liquid inlet, a pressure reducing valve and a pressure reduction unit liquid outlet; the pressure reduction unit liquid inlet, the pressure reduction unit liquid outlet are connected to the pressure reducing valve, and a Tesla valve unit string is arranged on the pressure reducing valve; the pressure reduction unit liquid inlet is used to introduce high-pressure liquid, the pressure reducing valve is used to reduce the pressure and flow rate of the introduced high-pressure liquid, and the pressure reduction unit liquid outlet is used to send the liquid with reduced pressure and flow rate into the power coupling unit.

[0010] According to the described coupled power hydraulic power generation system, the Tesla valve unit strings are arranged in series to extend the flow path of the high-pressure liquid so that the pressure and flow rate of the outflowing liquid meet the requirements of the power coupling unit.

[0011] According to the described coupled power hydraulic power generation system, the Tesla valve unit strings are arranged in parallel to increase the flow rate of the output liquid.

[0012] According to the described coupled power hydraulic power generation system, a solenoid valve is further arranged on the main inlet pipeline; a hydraulic motor is built in the power coupling unit; speed measuring sensors are arranged in the power generation unit and the power coupling unit; a voltage acquisition circuit is arranged on the energy storage unit; pressure sensors are arranged on the front and back sides of the pressure reduction unit and the emulsion liquid pumping station; the monitoring unit can also monitor the pressures on the front and back sides of the pressure reduction unit and the emulsion liquid pumping station.

[0013] According to the described coupled power hydraulic power generation system, the power generation system further includes: a voltage stabilizing unit, an intrinsically safe unit, and a driving unit; the voltage stabilizing unit is arranged between the power generation unit and the energy storage unit, and is used for stabilizing the output voltage of the power generation unit and protecting against overcurrent of the output current, and charging the energy storage unit after voltage stabilization and overcurrent protection; the driving unit is used for controlling the opening and closing of the solenoid valve, and further controlling the start and stop of the step-down unit; the intrinsically safe unit is connected to the driving unit and is used for protecting the supply voltage and current of the driving unit.

[0014] According to the described coupled power hydraulic power generation system, the monitoring unit includes: an MCU controller, a power quantity detection unit, a rotation speed detection unit, a display unit, a communication unit, a pressure detection unit, and a driving unit; the power quantity detection unit detects the power quantity of the energy storage unit through a voltage acquisition circuit, the rotation speed detection unit detects the rotation speeds of the power generation unit and the power coupling unit through a speed measuring sensor, the display unit is used for displaying the state of the power generation system, the communication unit is used for transmitting the working state and fault alarm of the power generation system to the host computer and transmitting the fault judgment result, the pressure detection unit is used for monitoring the pressures before and after the step-down unit and at the emulsion pump station, and the MCU controller is used for controlling the above units.

[0015] Another aspect of the present application provides a fault monitoring method for a coupled power hydraulic power generation system. Based on the described coupled power hydraulic power generation system, the method includes the following steps:

[0016] The monitoring unit detects the charging voltage and discharging voltage of the energy storage unit through the power quantity detection unit, and compares them with the voltage threshold.

[0017] The monitoring unit detects the pressure of the emulsion pump station through the pressure detection unit, and judges whether the pressure of the emulsion pump station is greater than zero.

[0018] If the pressure of the emulsion pump station is greater than zero, then the pressure before the pressure reducing valve is detected through the pressure detection unit, and it is judged whether the pressure before the pressure reducing valve is greater than zero.

[0019] If the pressure before the pressure reducing valve is greater than zero, then the pressure after the pressure reducing valve is detected through the pressure detection unit, and it is judged whether the pressure after the pressure reducing valve is greater than zero.

[0020] If the pressure after the pressure reducing valve is greater than zero, then the rotation speed of the hydraulic motor is detected through the rotation speed detection unit, and it is judged whether the rotation speed of the hydraulic motor is equal to zero.

[0021] If the rotation speed of the hydraulic motor is not equal to zero, then it is further judged whether the rotation speed is lower than the threshold.

[0022] If the rotation speed of the hydraulic motor is higher than the threshold, then the charging power quantity is displayed, and it is judged whether the charging voltage reaches the upper limit of the charging threshold.

[0023] If the charging voltage reaches the upper limit of the charging threshold, the solenoid valve is driven to close by the driving unit, and after the solenoid valve is closed for a period of time, it is judged with a time delay whether the rotational speed of the hydraulic motor is zero;

[0024] If the rotational speed of the hydraulic motor is zero, this monitoring is ended.

[0025] According to the fault monitoring method of the coupled power hydraulic power generation system described above, the following steps are further included:

[0026] If the charging voltage is higher than the threshold or the discharging voltage is higher than the threshold, the system parameters are uploaded through the communication unit;

[0027] If the charging voltage is lower than the threshold or the discharging voltage is lower than the threshold, the solenoid valve is driven to open by the driving unit to realize high-pressure liquid inlet;

[0028] If the pressure of the emulsion pump station is not greater than zero, it is determined that the emulsion pump station is not started, and the system parameters are uploaded;

[0029] If the pressure before the pressure reducing valve is not greater than zero, it is determined that the solenoid valve is faulty, an alarm is given and the fault information is uploaded;

[0030] If the pressure after the pressure reducing valve is not greater than zero, it is determined that the pressure reducing valve is blocked, an alarm is given and the fault information is uploaded;

[0031] If the rotational speed of the hydraulic motor is equal to zero, it is determined that the hydraulic motor is faulty, an alarm is given and the fault information is uploaded;

[0032] If the rotational speed of the hydraulic motor is lower than the threshold, it is determined that the pressure reducing valve is blocked, an alarm is given and the fault information is uploaded;

[0033] If the charging voltage does not reach the upper limit of the charging threshold, it is cyclically judged whether the charging voltage reaches the upper limit of the charging threshold;

[0034] If the rotational speed of the hydraulic motor is not zero, it is determined that the solenoid valve is faulty, an alarm is given and the fault information is uploaded.

[0035] Compared with the prior art, the beneficial effects of the present invention at least include:

[0036] (1), The present application proposes a pressure reducing valve for a catheter structure component with a Tesla valve unit, which has no moving parts, and this device can operate stably for a long time without maintenance;

[0037] (2), The magnetic coupling unit and the power generation unit realize energy conversion through the magnetic coupling device, thereby realizing that there is no sealing structure between the hydraulic drive cabin and the generator cabin, and avoiding damage caused by the liquid in the hydraulic drive cabin entering the generator cabin;

[0038] (3) The design of this application is reasonable, with a simple structure, continuous and controllable liquid inlet, small volume, achieving hydraulic power generation for the fully-mechanized mining face through emulsion, ensuring stable output of power generation efficiency, and the monitoring unit of this application automatically adjusts the hydraulic switch-off, greatly reducing energy loss and improving power generation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a block diagram of the power generation system according to the first embodiment of the present invention;

[0040] Figure 2 It is a diagram of the emulsion system of the present invention;

[0041] Figure 3 It is a structural diagram of the voltage reduction unit of the present invention;

[0042] Figure 4 It is an unfolded diagram of the series connection mode of the Tesla valve unit string of the present invention;

[0043] Figure 5 It is an unfolded diagram of the parallel connection mode of the Tesla valve unit string of the present invention;

[0044] Figure 6 It is a block diagram of the power generation system according to the second embodiment of the present invention;

[0045] Figure 7 It is a block diagram of the monitoring unit of the present invention;

[0046] Figure 8 It is a fault detection flow chart of the present invention;

[0047] In the figure: 100, power generation system; 101, voltage reduction unit; 1011, liquid inlet of the voltage reduction unit; 1012, pressure reducing valve; 1013, liquid outlet of the voltage reduction unit; 1014, Tesla valve unit string; 102, power coupling unit; 103, power generation unit; 104, voltage stabilizing unit; 105, energy storage unit; 106, intrinsically safe unit; 107, monitoring unit; 108, driving unit; 109, emulsion pump station; 110, filter. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0048] Now, various exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that: unless otherwise specifically stated, the relative arrangements of components and steps set forth in these embodiments, numerical expressions and values do not limit the scope of the present invention.

[0049] At the same time, it should be understood that, for the sake of convenience of description, the dimensions of the various parts shown in the drawings are not drawn according to the actual proportional relationship.

[0050] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way a limitation on the present invention, its application, or its use.

[0051] Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such technologies, methods, and devices should be regarded as part of the authorization specification.

[0052] In all the examples shown and discussed here, any specific values should be construed as merely exemplary and not as limitations. Thus, other examples of the exemplary embodiments may have different values.

[0053] It should be noted that like reference numerals and letters denote like items in the following figures, and thus, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0054] As Figure 1 shown, the present invention provides a coupled power hydraulic power generation system. The power generation system 100 includes: a pressure reduction unit 101, a power coupling unit 102, a power generation unit 103, an energy storage unit 105, a monitoring unit 107, and an emulsion liquid system;

[0055] The pressure reduction unit 101 is used to reduce the pressure and flow rate of high-pressure liquid to a predetermined value as the power source of the power generation system.

[0056] The power coupling unit 102 is connected to the pressure reduction unit 101 and is used to convert hydraulic energy into mechanical energy and drive the power generation unit.

[0057] The power generation unit 103 is respectively connected to the power coupling unit 102 and the energy storage unit 105 and is used to generate electricity using mechanical energy.

[0058] The energy storage unit 105 is used to store the electric energy generated by the power generation unit 103.

[0059] The monitoring unit 107 is connected to the energy storage unit 105 and the power generation unit 103 and is used to monitor the voltage and power of the energy storage unit 105 and the rotational speeds of the power generation unit 103 and the power coupling unit 102.

[0060] In one embodiment, the control unit 107 incorporates an intrinsically safe circuit and a monitoring circuit.

[0061] As Figure 2As shown in the figure, the emulsion system includes an emulsion pump station 109, a filter 110, a pressure reduction unit 101, and a power coupling unit 102 that are connected in sequence to form a loop; a main return pipeline is connected between the emulsion pump station 109 and the power coupling unit 102. The main valve has no less than one passage. The emulsion pump station 109 is connected to the main valve through a main inlet pipeline. One of the passages of the main valve is connected to the filter 110, and the filter 110 is connected to the pressure reduction unit 101; the emulsion system is used to provide a hydraulic medium.

[0062] Pressure sensors are arranged on the front and rear sides of the pressure reduction unit 101 and on the emulsion pump station 109.

[0063] The monitoring unit 107 can also monitor the pressures on the front and rear sides of the pressure reduction unit 101 and the emulsion pump station 109.

[0064] Optionally, as Figures 3 - 5 shown, the pressure reduction unit 101 includes a pressure reduction unit liquid inlet 1011, a pressure reducing valve 1012, and a pressure reduction unit liquid outlet 1013; the pressure reduction unit liquid inlet 1011, the pressure reduction unit liquid outlet 1013 are connected to the pressure reducing valve 1012, and a Tesla valve unit string 1014 is opened on the pressure reducing valve 1012. The pressure reduction unit liquid inlet 1011 is used to introduce high-pressure liquid. The pressure reducing valve 1012 is used to reduce the pressure and flow rate of the introduced high-pressure liquid. The pressure reduction unit liquid outlet 1013 is used to send the liquid with reduced pressure and flow rate into the power coupling unit 102; according to the different initial pressures and flow rates of the high-pressure liquid and the different requirements of the power coupling unit 102 for the pressure and flow rate of the liquid, the Tesla valve unit string can be arranged in series or in parallel;

[0065] In one embodiment, the Tesla valve unit string 1014 is arranged in series to extend the flow path of the high-pressure liquid so that the pressure and flow rate of the outflowing liquid meet the requirements of the power coupling unit 102. When the pressure and flow rate of the high-pressure liquid introduced from the pressure reduction unit liquid inlet 1011 are too high and / or the requirements of the power coupling unit 102 for the pressure and flow rate values of the liquid are too low, this arrangement method can be adopted to increase the flow path of the high-pressure liquid, so as to meet the requirements of the power coupling unit 102 for the pressure and flow rate of the liquid.

[0066] In another embodiment, the Tesla valve unit string 1014 is arranged in parallel to increase the flow rate of the output liquid.

[0067] Optionally, the power coupling unit 102 includes: a power coupling unit liquid inlet, a hydraulic motor, a power coupling unit liquid outlet, and a first magnetic unit; the hydraulic motor includes: an impeller and an impeller chamber; the hydraulic motor is connected to the power coupling unit liquid inlet, the power coupling unit liquid outlet, and the first magnetic unit; the power coupling unit liquid inlet is used to introduce liquid into the impeller chamber of the hydraulic motor, and drive the impeller to rotate through the liquid, the impeller is used to drive the first magnetic unit to rotate, the power coupling unit liquid outlet is connected to the main return pipeline, and is used to reintroduce the liquid into the emulsion pump station, and the first magnetic unit is used to drive the power generation unit 103 to work. The power coupling unit 102 is arranged in the hydraulic drive compartment.

[0068] Optionally, the power generation unit 103 includes: a generator rotor; a second magnetic unit is arranged on the generator rotor, and the rotation of the second magnetic unit drives the generator rotor to rotate, thereby realizing power generation. The power generation unit 103 is arranged in the generator compartment.

[0069] Second embodiment:

[0070] An electromagnetic valve is further arranged on the main inlet pipeline;

[0071] Speed measurement sensors are arranged on the power generation unit 103 and the power coupling unit 102 for speed measurement. The speed measurement is used to detect the rotational speeds of the generator rotor in the power generation unit 103 and the hydraulic motor in the power coupling unit 102. The speed measurement can also adopt methods such as photoelectric digital speed measurement and magnetoelectric speed sensor speed measurement; a voltage acquisition circuit is arranged on the energy storage unit 105.

[0072] As Figure 6 shown, the power generation system 100 further includes: a voltage stabilization unit 104, an intrinsically safe unit 106, and a drive unit 108;

[0073] The voltage stabilization unit 104 is arranged between the power generation unit 103 and the energy storage unit 105, and is used to stabilize the output voltage of the power generation unit 103 and perform overcurrent protection on the output current, and charge the energy storage unit 105 after voltage stabilization;

[0074] The intrinsically safe unit 106 is connected to the drive unit 108, and is used to protect the supply voltage and current of the drive unit 108;

[0075] The drive unit 108 is used to control the opening and closing of the electromagnetic valve, and thus control the start and stop of the step-down unit 101.

[0076] The energy storage unit 105 is electrically connected to the electrical components in the power generation system 100, and is used to supply power to the electrical components.

[0077] As Figure 7As shown in the figure, the monitoring unit 107 includes: an MCU controller, a power detection unit, a speed detection unit, a key unit, a display unit, a communication unit, a pressure detection unit, and a driving unit; the power detection unit detects the power of the energy storage unit 105 through a voltage acquisition circuit, the speed detection unit detects the speeds of the generator rotor and the hydraulic motor through a speed sensor, the display unit is used to display the status of the power generation system 100, the communication unit is used to transmit the working status and fault alarm of the power generation system 100 to the host computer and transmit the fault judgment result, the pressure detection unit is used to monitor the pressures before and after the pressure reduction unit 101 and the emulsion pump station 109, the MCU controller is used to control the above units, and the key unit has functions of querying the display information of the power generation device and setting information parameters.

[0078] During the charging process:

[0079] When the monitoring unit 107 detects that the speed of the power generation unit 103 is too high, it can be determined that the input pressure of the pressure reduction unit 101 is too high and does not match the power generation system 100;

[0080] When the monitoring unit 107 detects that the speed of the power generation unit 103 is too low, it can judge faults such as insufficient input pressure of the pressure reduction unit 101 or blockage of the pressure reduction unit;

[0081] When the monitoring unit 107 detects that the charging voltage of the energy storage unit 105 reaches the set threshold, the monitoring unit 107 sends an instruction to the driving unit 108, and the driving unit 108 drives the solenoid valve to cut off the input pipeline of the pressure reducing valve 101. At this time, the power generation unit 103 is in an idle state;

[0082] When the monitoring unit 107 detects that the discharge voltage of the energy storage unit 105 reaches the set threshold, the monitoring unit 107 sends an instruction to the driving unit 108, and the driving unit 108 drives the solenoid valve to open the input pipeline of the pressure reducing valve 101. At this time, the power generation unit is in a working state.

[0083] Working principle:

[0084] The high-pressure liquid of the emulsion pump station 109 is transported to the fully-mechanized mining face through the main inlet pipeline, and each hydraulic support main inlet interface is connected through a tee. The main inlet pipeline then passes through the filter 110 and the pressure reduction unit 101 to reduce the pressure and flow rate to a suitable range and enter the inlet of the power coupling unit 102. The liquid drives the impeller to rotate, and then drives the first magnetic unit to rotate. After that, it is connected to the main return pipeline through the other side outlet. The first magnetic unit drives the second magnetic unit on the generator rotor of the power generation unit 103 through magnetic coupling, and the second magnetic unit rotates to drive the generator rotor to rotate, thereby generating electricity;

[0085] After the voltage is rectified, filtered, and voltage-regulated, it charges the energy storage unit 105, provides overvoltage, overcurrent, and short-circuit protection to the outside through the intrinsically safe unit 106. The monitoring unit 107, based on the speed sensors arranged on the generator rotor and the hydraulic motor, the voltage acquisition circuit of the energy storage unit 105, and the pressure sensors on the front and back sides of the step-down unit 101 and the emulsion pump station 109, monitors in real time whether the states of various parts of the power generation system 100 are working properly and performs corresponding actions;

[0086] During the charging process, when it is detected that the rotational speed of the hydraulic motor is too high, it can be judged that the input pressure of the step-down unit 101 is too high and does not match the power generation system 100, which can be solved by replacing a suitable step-down unit 101, such as the step-down unit 101 in series with a Tesla valve unit; when it is detected that the rotational speed of the hydraulic motor is too low, it can be judged that there are faults such as insufficient input pressure of the step-down unit 101 or blockage of the step-down unit. At this time, if the pressure of the emulsion pump station 109 is normal, it can be further judged that the step-down unit 101 is blocked, and the filter 110 needs to be checked for faults in time.

[0087] When it is monitored that the charging voltage of the energy storage unit 105 reaches the set threshold, the monitoring unit 107 sends a command to the driving unit 108, and the driving unit 108 drives the solenoid valve to close the input pipeline of the pressure reducing valve 101. At this time, the power generation unit 103 is in an idle state. When it is monitored that the discharge voltage of the energy storage unit 105 reaches the set threshold, the monitoring unit 107 sends a command to the driving unit 108, and the driving unit 108 drives the solenoid valve to open the input pipeline of the pressure reducing valve 101. At this time, the power generation unit is in a working state.

[0088] In another embodiment, when the energy of the energy storage unit increases, the housing of the power generation system 100 can adopt an explosion-proof housing.

[0089] Third Embodiment:

[0090] As Figure 8 shown, the present application also provides a fault monitoring method for a coupled power hydraulic power generation system. Based on a coupled power hydraulic power generation system, it includes the following steps:

[0091] S1. The monitoring unit 107 detects the charging voltage and discharge voltage of the energy storage unit 105 through the power detection unit and compares them with the voltage threshold;

[0092] S11. If the charging voltage is higher than the threshold or the discharge voltage is higher than the threshold, the system parameters are uploaded through the communication unit;

[0093] S12. If the charging voltage is lower than the threshold or the discharge voltage is lower than the threshold, the solenoid valve is driven to open through the driving unit 108 to achieve high-pressure liquid inlet;

[0094] S2. The monitoring unit 107 detects the pressure of the emulsion pump station 109 through the pressure detection unit and determines whether the pressure of the emulsion pump station 109 is greater than zero;

[0095] S21. If the pressure of the emulsion pump station 109 is not greater than zero, it is determined that the emulsion pump station 109 is not started, and the system parameters are uploaded;

[0096] S3. If the pressure of the emulsion pump station 109 is greater than zero, the pressure before the pressure reducing valve 1012 is detected through the pressure detection unit and it is determined whether the pressure before the pressure reducing valve 1012 is greater than zero;

[0097] S31. If the pressure before the pressure reducing valve 1012 is not greater than zero, it is determined that the solenoid valve fails, an alarm is given and the fault information is uploaded;

[0098] S4. If the pressure before the pressure reducing valve 1012 is greater than zero, the pressure after the pressure reducing valve 1012 is detected through the pressure detection unit and it is determined whether the pressure after the pressure reducing valve 1012 is greater than zero;

[0099] S41. If the pressure after the pressure reducing valve 1012 is not greater than zero, it is determined that the pressure reducing valve 1012 is blocked, an alarm is given and the fault information is uploaded;

[0100] S5. If the pressure after the pressure reducing valve 1012 is greater than zero, the rotation speed of the hydraulic motor is detected through the rotation speed detection unit and it is determined whether the rotation speed of the hydraulic motor is equal to zero;

[0101] S51. If the rotation speed of the hydraulic motor is equal to zero, it is determined that the hydraulic motor fails, an alarm is given and the fault information is uploaded;

[0102] S6. If the rotation speed of the hydraulic motor is not equal to zero, it is further determined whether the rotation speed is lower than the threshold value;

[0103] S61. If the rotation speed of the hydraulic motor is lower than the threshold value, it is determined that the pressure reducing valve 1012 is blocked, an alarm is given and the fault information is uploaded;

[0104] S7. If the rotation speed of the hydraulic motor is higher than the threshold value, the charging power is displayed and it is determined whether the charging voltage reaches the upper limit of the charging threshold;

[0105] S71. If the charging voltage does not reach the upper limit of the charging threshold, it is continuously determined whether the charging voltage reaches the upper limit of the charging threshold;

[0106] S8. If the charging voltage reaches the upper limit of the charging threshold, the solenoid valve is driven to close through the driving unit 108, and after the solenoid valve is closed for a period of time, it is determined after a delay whether the rotation speed of the hydraulic motor is zero;

[0107] S81. If the rotation speed of the hydraulic motor is not zero, it is determined that the solenoid valve fails, an alarm is given and the fault information is uploaded;

[0108] S9. If the rotational speed of the hydraulic motor is zero, end this monitoring.

[0109] The monitoring unit 107 with closed-loop control and the logic algorithm are used to achieve the rectification of electric energy, the storage of redundant energy, the stable output of intrinsically safe performance, and the pre-judgment and alarm of faults.

[0110] The electric energy is continuously generated and stored, and its energy can meet the power consumption requirements of multiple sets of electro-hydraulic control systems and video monitoring systems. This power generation system has the advantages of simple structure, high integration, low maintenance volume, and can operate stably for a long time.

[0111] Compared with the prior art, the beneficial effects of the present invention at least include:

[0112] (1). The present application proposes a pressure reducing valve for the catheter structure component with a Tesla valve unit, which has no moving parts, and this device can operate stably for a long time without maintenance.

[0113] (2). The magnetic coupling unit and the power generation unit realize energy conversion through the magnetic coupling device, thus achieving a non-sealed structure between the hydraulic drive cabin and the generator cabin, avoiding damage caused by the liquid in the hydraulic drive cabin entering the generator cabin.

[0114] (3). The design of the present application is reasonable, the structure is simple, the liquid inlet is continuously controllable, the volume is small, the hydraulic power generation for the fully-mechanized coal mining face through emulsion liquid is realized, ensuring the stable output of the power generation efficiency, and the monitoring unit of the present application automatically adjusts the hydraulic switching, greatly reducing the energy loss and improving the power generation efficiency.

[0115] So far, a coupled power hydraulic power generation system and a fault monitoring method according to the present invention have been described in detail. In order to avoid obscuring the concept of the present invention, some details well known in the art have not been described. Those skilled in the art can fully understand how to implement the technical solutions disclosed here based on the above description.

[0116] The method and system of the present invention can be implemented in many ways. For example, the method and system of the present invention can be implemented by software, hardware, firmware or any combination of software, hardware, and firmware. The above order of the steps for the method is only for illustration, and the steps of the method of the present invention are not limited to the above specific described order, unless otherwise specifically stated. In addition, in some embodiments, the present invention can also be implemented as a program recorded in a recording medium, and these programs include machine-readable instructions for implementing the method according to the present invention. Therefore, the present invention also covers the recording medium storing the program for executing the method according to the present invention.

[0117] Although some specific embodiments of the present invention have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustrative purposes only and not for limiting the scope of the present invention. Those skilled in the art should understand that the above embodiments can be modified without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A coupled power hydraulic power generation system, comprising: A pressure reduction unit (101), a power coupling unit (102), a power generation unit (103), an energy storage unit (105), and a monitoring unit (107); characterized in that: The pressure reduction unit (101) is used to reduce the pressure and flow rate of high-pressure liquid to a predetermined value and serve as the power source of the power generation system (100); The power coupling unit (102) is connected to the pressure reduction unit (101) and is used to convert hydraulic energy into mechanical energy and drive the power generation unit (103); The power generation unit (103) is respectively connected to the power coupling unit (102) and the energy storage unit (105) and is used to generate electricity by using mechanical energy; The energy storage unit (105) is used to store the electric energy generated by the power generation unit (103); The monitoring unit (107) is connected to the energy storage unit (105) and the power generation unit (103) and is used to monitor the voltage and power of the energy storage unit (105) and the rotational speeds of the power generation unit (103) and the power coupling unit (102).

2. The coupled power hydraulic power generation system according to claim 1, characterized in that: The power generation system (100) further includes: an emulsion liquid system; The emulsion liquid system includes an emulsion liquid pumping station (109), a filter (110), a pressure reduction unit (101), a power coupling unit (102), and a main valve that are connected in sequence to form a loop; the main valve has no less than one passage; The emulsion liquid pumping station (109) and the power coupling unit (102) are connected through a main return pipeline; The emulsion liquid pumping station (109) is connected to the main valve through a main inlet pipeline, one passage of the main valve is connected to the filter (110), and the filter (110) is connected to the pressure reduction unit (101); The emulsion liquid system is used to provide a hydraulic medium.

3. The coupled power hydraulic power generation system according to claim 1, characterized in that: The pressure reduction unit (101) includes: a pressure reduction unit liquid inlet (1011), a pressure reducing valve (1012), and a pressure reduction unit liquid outlet (1013); the pressure reduction unit liquid inlet (1011), the pressure reduction unit liquid outlet (1013), and the pressure reducing valve (1012) are connected, and a Tesla valve unit string (1014) is opened on the pressure reducing valve (1012); The pressure reduction unit liquid inlet (1011) is used to introduce high-pressure liquid, the pressure reducing valve (1012) is used to reduce the pressure and flow rate of the introduced high-pressure liquid, and the pressure reduction unit liquid outlet (1013) is used to send the liquid with reduced pressure and flow rate into the power coupling unit (102).

4. The coupled power hydraulic power generation system according to claim 3, characterized in that: The Tesla valve unit string (1014) is arranged in series and is used to extend the flow path of the high-pressure liquid so that the pressure and flow rate of the outflowing liquid meet the requirements of the power coupling unit (102).

5. The coupled power hydraulic power generation system according to claim 3, characterized in that: The Tesla valve unit string (1014) is arranged in parallel and is used to increase the flow rate of the output liquid.

6. The coupled power hydraulic power generation system according to claim 2, characterized in that: An electromagnetic valve is also provided on the main inlet pipeline; the power coupling unit (102) is internally provided with a hydraulic motor; Speed sensors are provided in the power generation unit (103) and the power coupling unit (102); a voltage acquisition circuit is provided on the energy storage unit (105); Pressure sensors are provided on the front and rear sides of the step-down unit (101) and on the emulsion pump station (109); The monitoring unit (107) can also monitor the pressures on the front and rear sides of the step-down unit (101) and on the emulsion pump station (109).

7. A coupled power hydraulic power generation system according to claim 6, characterized in that: The power generation system (100) further includes: a voltage stabilizing unit (104), an intrinsically safe unit (106), and a driving unit (108); The voltage stabilizing unit (104) is arranged between the power generation unit (103) and the energy storage unit (105), and is used for stabilizing the output voltage of the power generation unit (103) and protecting against overcurrent of the output current, and charging the energy storage unit (105) after voltage stabilization and overcurrent protection; The driving unit (108) is used for controlling the opening and closing of the electromagnetic valve, and thus controlling the start and stop of the step-down unit (101); The intrinsically safe unit (106) is connected to the driving unit (108) and is used for protecting the supply voltage and current of the driving unit (108).

8. A coupled power hydraulic power generation system according to claim 7, characterized in that: The monitoring unit (107) includes: an MCU controller, a power quantity detection unit, a rotation speed detection unit, a display unit, a communication unit, a pressure detection unit, and a driving unit; The power quantity detection unit detects the power quantity of the energy storage unit (105) through the voltage acquisition circuit, the rotation speed detection unit detects the rotation speeds of the power generation unit (103) and the power coupling unit (102) through the speed sensors, the display unit is used for displaying the state of the power generation system (100), the communication unit is used for transmitting the working state and fault alarm of the power generation system (100) to the host computer and transmitting the fault judgment result, the pressure detection unit is used for monitoring the pressures on the front and rear sides of the step-down unit (101) and on the emulsion pump station (109), and the MCU controller is used for controlling the above units.

9. A fault monitoring method for a coupled power hydraulic power generation system, characterized in that: Based on a coupled power hydraulic power generation system according to any one of claims 1-8, comprising the following steps: The monitoring unit (107) detects the charging voltage and discharging voltage of the energy storage unit (105) through the power quantity detection unit and compares them with the voltage threshold; The monitoring unit (107) detects the pressure of the emulsion pump station (109) through the pressure detection unit and judges whether the pressure of the emulsion pump station (109) is greater than zero; If the pressure of the emulsion pump station (109) is greater than zero, then the pressure in front of the pressure reducing valve (1012) is detected through the pressure detection unit and it is judged whether the pressure in front of the pressure reducing valve (1012) is greater than zero; If the pressure before the pressure reducing valve (1012) is greater than zero, the pressure after the pressure reducing valve (1012) is detected by the pressure detection unit, and it is judged whether the pressure after the pressure reducing valve (1012) is greater than zero; If the pressure after the pressure reducing valve (1012) is greater than zero, the rotational speed of the hydraulic motor is detected by the rotational speed detection unit, and it is judged whether the rotational speed of the hydraulic motor is equal to zero; If the rotational speed of the hydraulic motor is not equal to zero, then it is further judged whether the rotational speed is lower than the threshold value; If the rotational speed of the hydraulic motor is higher than the threshold value, the charging power is displayed, and it is judged whether the charging voltage reaches the upper limit of the charging threshold; If the charging voltage reaches the upper limit of the charging threshold, the solenoid valve is driven to close by the driving unit (108), and after the solenoid valve is closed for a period of time, it is judged with a time delay whether the rotational speed of the hydraulic motor is zero; If the rotational speed of the hydraulic motor is zero, this monitoring is ended.

10. The fault monitoring method of a coupled power hydraulic power generation system according to claim 9, characterized in that: The fault monitoring method further includes the following steps: If the charging voltage is higher than the threshold value or the discharging voltage is higher than the threshold value, the system parameters are uploaded through the communication unit; If the charging voltage is lower than the threshold value or the discharging voltage is lower than the threshold value, the solenoid valve is driven to open by the driving unit (108) to achieve high-pressure liquid inlet; If the pressure of the emulsion pump station (109) is not greater than zero, it is determined that the emulsion pump station (109) is not started, and the system parameters are uploaded; If the pressure before the pressure reducing valve (1012) is not greater than zero, it is determined that the solenoid valve is faulty, an alarm is given, and the fault information is uploaded; If the pressure after the pressure reducing valve (1012) is not greater than zero, it is determined that the pressure reducing valve (1012) is blocked, an alarm is given, and the fault information is uploaded; If the rotational speed of the hydraulic motor is equal to zero, it is determined that the hydraulic motor is faulty, an alarm is given, and the fault information is uploaded; If the rotational speed of the hydraulic motor is lower than the threshold value, it is determined that the pressure reducing valve (1012) is blocked, an alarm is given, and the fault information is uploaded; If the charging voltage does not reach the upper limit of the charging threshold, it is continuously judged whether the charging voltage reaches the upper limit of the charging threshold; If the rotational speed of the hydraulic motor is not zero, it is determined that the solenoid valve is faulty, an alarm is given, and the fault information is uploaded.

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