A float valve detection device for a hydrogen side oil return control box and a working method thereof

Abstract

The present application discloses a float valve detection device for a hydrogen side oil return control box and a working method thereof, wherein the device comprises a hydraulic oil tank (V11), an air source, an oil injection circuit and a ventilation circuit; the first branch connected to the oil discharge float valve (V0A) in the hydrogen side oil return control box and the second branch connected to the oil replenishment float valve (V0B) are both connected to the hydraulic oil tank (V11); one end of the oil injection circuit is connected to the hydraulic oil tank (V11), and the other end is connected to the hydrogen side oil return control box; the hydrogen side oil return control box and the air source are connected via a ventilation circuit. The method performs an opening and closing test of the oil discharge float valve (V0A) and a functional test of the oil replenishment float valve (V0B) through the device. The beneficial effects of the present application: the present application can replace the traditional manual inspection method, and through the opening and closing of the valve and the automatic injection control of oil and gas, there is no need for frequent manual operations, which can reduce the labor intensity.

Description

Technical Field

[0001] The present application relates to the technical field of steam turbine generators, and in particular to a float valve detection device for a hydrogen-side oil return control box and a working method thereof. Background Art

[0002] The hydrogen side oil return control box is one of the important equipment of the double circulation sealing oil system of the steam turbine generator. Its liquid level is mainly controlled by the opening and closing of the float valve. At present, the inspection of the float valve of the hydrogen side oil return control box mainly relies on manual work. The manual inspection method has the following main disadvantages:

[0003] (1) Manual inspection involves many steps. The pipelines near the hydrogen-side oil return control box of the sealing oil system are complex, which makes it inconvenient for the commissioning personnel to operate and difficult to debug.

[0004] (2) Manual inspection requires slightly opening the isolation valve to check whether there is oil leakage from the outlet. Manual oil collection is required, which can easily cause the site to be dirty.

[0005] (3) After the test, the oil needs to be drained and the air needs to be exhausted. This mainly relies on manual draining and oil collection. The oil needs to be collected on site and then put back into the oil barrel, which is inconvenient.

[0006] (4) To ensure the stable operation of the system, the liquid level sensor of the hydrogen side return oil control box is not connected to any external device and can only be displayed on the DCS in the central control room. On-site inspection is mainly based on the liquid level value recorded by the magnetic column liquid level gauge. If the data is inaccurate, a dedicated person must be responsible for checking the liquid level value on the magnetic column liquid level gauge. Summary of the invention

[0007] One of the objects of the present application is to provide a float valve detection device for a hydrogen side oil return control box that can solve at least one defect in the above-mentioned background technology.

[0008] Another object of the present application is to provide a working method of a float valve detection device for a hydrogen side oil return control box that can solve at least one defect in the above-mentioned background technology.

[0009] In order to achieve at least one of the above-mentioned purposes, the technical solution adopted in the present application is: a float valve detection device for a hydrogen side oil return control box, comprising a hydraulic oil tank V11, an air source, an oil filling circuit and a ventilation circuit; a first branch connected to the oil drain float valve V0A in the hydrogen side oil return control box, and a second branch connected to the oil replenishment float valve V0B are both connected to the hydraulic oil tank V11; one end of the oil filling circuit is connected to the hydraulic oil tank V11, and the other end is connected to the hydrogen side oil return control box, and the hydrogen side oil return control box is connected to the air source through the ventilation circuit; the function of the oil drain float valve V0A and the oil replenishment float valve V0B is tested by controlling the opening and closing sequence of the first branch, the second branch, the oil filling circuit and the ventilation circuit.

[0010] Preferably, the first branch and the second branch both include an electromagnetic reversing valve V01, a pressure sensor V02 and a flow sensor V03 which are connected in sequence; the electromagnetic reversing valve V01 is suitable for controlling the conduction and cutoff of the first branch or the second branch, the pressure sensor V02 is used to detect the oil pressure of the first branch or the second branch, and the flow sensor V03 is used to detect the oil flow rate from the hydrogen side return oil control box to the hydraulic oil tank V11 through the first branch or the second branch, and calculates the liquid level height of the remaining oil in the hydrogen side return oil control box based on the detected oil flow rate.

[0011] Preferably, before the opening and closing test of the oil drain float valve V0A and the oil replenishing float valve V0B, the liquid level in the hydrogen side return oil control box is calibrated to V; and then during the test, the calculation formula of the oil volume discharged from the hydrogen side return oil control box and the oil flow Q detected by the flow sensor V03 is combined to calculate the liquid level height h of the remaining oil in the hydrogen side return oil control box.

[0012] Preferably, the hydrogen side oil return control box adopts a horizontal cylindrical box structure, and the zero point of the liquid level is located at the center point of the cross section of the hydrogen side oil return control box, so that it is consistent with the zero point of the magnetic flap level gauge and the DCS liquid level sensor on site; the liquid level height h is the height from the liquid surface to the center point of the cross section of the hydrogen side oil return control box. The calculation formula for the liquid level height h of the remaining oil in the hydrogen side oil return control box from the time t1 when the calibration is completed to the time t2 is as follows:

[0013] ;

[0014] ;

[0015] V2=V-V1;

[0016] Among them, V1 represents the capacity of the remaining oil in the hydrogen side oil return control box, V2 represents the oil flow rate flowing out of the hydrogen side oil return control box from t1 to t2, r represents the cross-sectional radius of the hydrogen side oil return control box, and L represents the horizontal length of the hydrogen side oil return control box.

[0017] Preferably, the oil injection circuit includes an oil pump group V20, an electromagnetic reversing valve V25 and a flow sensor V27 which are connected in sequence; the oil pump group V20 is suitable for pumping the oil in the hydraulic oil tank V11 along the oil injection circuit to the hydrogen side oil return control box, and the electromagnetic reversing valve V25 is suitable for controlling the conduction or cutoff of the oil injection circuit; the flow sensor V27 is suitable for detecting the oil flow rate flowing through the oil injection circuit, and calculating the amount of oil injected into the hydrogen side oil return control box based on the detection result.

[0018] Preferably, the ventilation circuit includes a ventilation branch and an exhaust branch connected in parallel; the ventilation branch is connected between the hydrogen side oil return control box and the gas source, and the exhaust branch connects the hydrogen side oil return control box with the outside world; the ventilation branch includes a switch valve V41 and an electromagnetic ventilation valve group connected in sequence, and the exhaust branch includes an electromagnetic ventilation valve V51 and an oil mist separator V50 connected in sequence; when performing an opening test of the oil drain float valve V0A, the electromagnetic ventilation valve V51 is suitable for controlling the exhaust branch to conduct exhaust; when performing a closing test of the oil drain float valve V0A and a functional test of the oil replenishment float valve V0B, the electromagnetic ventilation valve group is suitable for controlling the ventilation branch to conduct, and then the gas source inflates the hydrogen side oil return control box to a set pressure.

[0019] A working method of the above-mentioned float valve detection device of the hydrogen side oil return control box comprises the following steps:

[0020] S100: Detect and process the oil volume and temperature in the hydraulic oil tank V11, and proceed to step S200 after the oil volume and temperature in the hydraulic oil tank V11 meet the requirements;

[0021] S200: The first branch is turned on, the second branch is turned off, oil is injected into the oil return control box on the hydrogen side through the oil injection circuit, and the oil pressure and oil flow in the oil injection circuit and the first branch are used to test the opening of the oil discharge float valve V0A;

[0022] S300: After completing the opening test of the oil discharge float valve V0A, the oil filling circuit is cut off, and then the ventilation circuit is opened to inflate the hydrogen side oil return control box to the set pressure, and the closing of the oil discharge float valve V0A is tested based on the oil pressure and oil flow in the first branch;

[0023] S400: After completing the closing test of the oil discharge float valve V0A, the second branch is opened, and the opening of the oil replenishment float valve V0B is tested based on the oil pressure and oil flow in the second branch;

[0024] S500: After completing the opening test of the oil replenishment float valve V0B, the hydrogen side oil return control box is emptied. After completing the emptying of the hydrogen side oil return control box, the oil circuit is removed to end the test.

[0025] Preferably, step S200 includes the following specific processes:

[0026] S210: Open the electromagnetic reversing valve V01 of the first branch, and close the electromagnetic reversing valve V01 of the second branch;

[0027] S220: Open the electromagnetic reversing valve V25 of the oil injection circuit and the electromagnetic ventilation valve V51 of the ventilation circuit, start the oil delivery pump group (V20) to inject oil into the hydrogen side oil return control box, and monitor the oil injection amount through the flow sensor V27;

[0028] S230: When the values ​​monitored by the pressure sensor V02 and the flow sensor V03 of the first branch are both less than or equal to the first threshold, and the oil injection amount monitored by the flow sensor V27 exceeds the second threshold, it is determined that the opening of the oil discharge float valve V0A fails, and the test is suspended, otherwise, step S240 is performed;

[0029] S240: Close the electromagnetic reversing valve V25 to cut off the refueling, close the electromagnetic reversing valve V01 of the first branch, record that the oil discharge float valve V0A has been opened and the liquid level height in the hydrogen side return oil control box calculated by the oil filling amount monitored by the flow sensor V27; after the on-site personnel calibrate the value of the liquid level gauge in the hydrogen side return oil control box with the calculated liquid level height value, proceed to step 250;

[0030] S250: Reopen the solenoid reversing valve V25 to continue to inject oil into the hydrogen side oil return control box, and continuously monitor the oil injection amount through the flow sensor V27 and calculate the liquid level height in the hydrogen side oil return control box; when it is monitored that the oil level height in the hydrogen side oil return control box rises to the set value, close the solenoid reversing valve V25 and the oil pump group V20 to complete the opening test of the oil drain float valve V0A.

[0031] Preferably, step S300 includes the following specific processes:

[0032] S310: Open the electromagnetic ventilation valve group of the ventilation circuit to allow the gas source to inflate the hydrogen side oil return control box;

[0033] S320: By adjusting the proportional pressure reducing valve V48 in the ventilation circuit, the air pressure in the hydrogen side return oil control box reaches the set pressure value;

[0034] S330: Open the electromagnetic reversing valve V01 in the first branch, and record the values ​​of the pressure sensor V02 and the flow sensor V03 in the first branch;

[0035] S340: When the values ​​of the pressure sensor V02 and the flow sensor V03 in the first branch are both reduced to 0, the liquid level height of the oil in the current hydrogen side return oil control box is calculated according to the recorded flow data of the flow sensor V03;

[0036] S350: After checking the calculated oil level height in the hydrogen side return oil control box with the value of the on-site liquid level meter, it is determined that the oil drain float valve V0A has been closed, and the closing test of the oil drain float valve V0A is completed.

[0037] Preferably, step S400 includes the following specific processes:

[0038] S410: Open the electromagnetic reversing valve V01 of the second branch, and record the values ​​of the pressure sensor V02 and the flow sensor V03 in the second branch;

[0039] S420: If the recorded values ​​of the pressure sensor V02 and the flow sensor V03 in the second branch are less than or equal to the third threshold, it is determined that the internal leakage of the oil replenishment float valve V0B is too large, otherwise, step S430 is performed;

[0040] S430: After confirming that there is no internal leakage in the oil supply float valve V0B, the electromagnetic reversing valve V01 in the first branch is closed after the set time t and the oil discharge float valve V0A is manually opened on site;

[0041] S440: After the oil discharge float valve V0A is manually opened, the electromagnetic reversing valve V01 in the first branch is opened again, and the data of the flow sensor V03 in the first branch is recorded to calculate the current liquid level of the oil in the hydrogen side return oil control box;

[0042] S450: When the liquid level of the oil in the hydrogen side oil return control box drops to the set fourth threshold value, and the values ​​of the pressure sensor V02 and the flow sensor V03 in the second branch are less than or equal to the fifth threshold value, it is determined that the oil replenishment float valve V0B fails and is not opened, otherwise it is determined that the oil replenishment float valve V0B is opened;

[0043] S460: Close the electromagnetic reversing valve V01 in the first branch and the second branch, and the functional test of the oil replenishing float valve V0B is completed.

[0044] Compared with the prior art, the beneficial effects of this application are:

[0045] (1) The present application can replace the traditional manual inspection method. By controlling the opening and closing of valves and the automatic injection of oil and gas, there is no need for frequent manual operations. While reducing the labor intensity, it can also reduce the generation of oil pollution on site.

[0046] (2) The present application integrates the data of the flow sensor to calculate the volume of the inlet and outlet oil, thereby calculating the liquid level height of the oil in the hydrogen side return oil control box, without the need to connect the liquid level sensor in the hydrogen side return oil control box. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 The present invention is a structural schematic diagram of a hydrogen side oil return control box in the prior art.

[0048] Figure 2 This is a schematic diagram of the pipeline structure of the float valve detection device in this application.

[0049] Figure 3 This is a schematic diagram of the case where the liquid level in the hydrogen side oil return control box is lower than the cross-sectional radius in this application.

[0050] Figure 4 This is a schematic diagram of the case where the liquid level in the hydrogen side oil return control box in this application is higher than the cross-sectional radius.

[0051] Figure 5 This is a schematic diagram of the working process of the float valve detection device in this application. DETAILED DESCRIPTION

[0052] Below, the present application is further described in conjunction with specific implementation methods. It should be noted that in the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms should not be understood as necessarily being directed to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification.

[0053] In the description of the present application, it should be noted that directional words, such as the terms "center", "lateral", "longitudinal", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating directions and positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of narrating the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and cannot be understood as limiting the specific scope of protection of the present application.

[0054] It should be noted that the terms "first", "second", etc. in the description and claims of the present application are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0055] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be connected, detachably connected, or integrated; it can be mechanically connected or electrically connected; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0056] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0057] The terms "including" and "having" and any variations thereof in the specification and claims of the present application are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus comprising a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to these processes, methods, products or apparatuses.

[0058] In order to facilitate the understanding of the technical solution of the present application, a specific process of manual inspection of the hydrogen side oil return control box in the prior art may be briefly described first.

[0059] like Figure 1 The figure is a schematic diagram of the structure of a hydrogen side oil return control box in the prior art. Figure 1 The specific steps of manual inspection of the hydrogen side oil return control box in the prior art are described.

[0060] (1) Close the isolation valve connecting the hydrogen side oil return control box and the external pipeline.

[0061] (2) Operate the oil drain valve to force open the valve, and put the oil drain valve (i.e., oil drain float valve) in the open position; at the same time, operate the oil replenishment valve to force close the valve, and put the oil replenishment valve (i.e., oil replenishment float valve) in the closed position.

[0062] (3) Fill the hydrogen side oil return control box with oil and check to confirm whether there is oil leakage at the outlet of the oil replenishment valve / oil drain valve.

[0063] (4) Slowly fill the oil until oil flows out of the outlet of the oil drain valve. Record the liquid level of the hydrogen side return oil control box at this time, that is, the opening level of the oil drain valve.

[0064] (5) Close the isolation valve on the drain valve plug, and continue to fill the hydrogen side oil return control box with oil until the liquid level reaches a certain value (generally about 10 mm higher than the opening level of the drain valve), then close the oil inlet valve, open the air inlet valve to inflate the hydrogen side oil return control box to 5.2 bar (the air pressure of the hydrogen side oil return control box when it is filled with hydrogen during normal operation is 5.2 bar. The air pressure of different gas turbines may be different and can be adjusted according to actual needs).

[0065] (6) Slightly open the isolation valve downstream of the drain valve plug, observe the oil leakage at the drain valve outlet, and record the liquid level when the drain valve outlet stops leaking, that is, the closing level of the drain valve.

[0066] (7) Operate the oil replenishing valve to force close the valve so that the oil replenishing valve is in a free state, and check to confirm that there is no oil leakage at the outlet of the oil replenishing valve.

[0067] (8) Operate the drain valve to force it open so that it is slightly open. Observe the oil tank liquid level and the oil leakage at the rear end of the replenishing valve. Record the liquid level of the hydrogen side return oil control box when the replenishing valve outlet starts to leak oil, that is, the replenishing valve opening level.

[0068] Based on the above inspection steps, there are many manual inspection steps, and the pipelines near the hydrogen side oil return control box of the sealing oil system are complicated. It is inconvenient for the debugging personnel to operate and the debugging is difficult. In addition, manual inspection requires slightly opening the isolation valve to see if there is oil leakage from the outlet, and manual oil connection is required, which easily leads to dirtiness on site. After the test, the oil needs to be drained and vented, which mainly relies on manual oil draining and oil connection. The oil needs to be connected on site and then put back into the oil barrel, which is inconvenient. In order to ensure the stable operation of the system, the liquid level sensor of the hydrogen side oil return control box is not connected to an external device and can only be displayed on the DCS in the central control room. The on-site inspection is mainly based on the liquid level value recorded by the magnetic column level gauge. The data is inaccurate, and a dedicated person is responsible for checking the value recorded by the magnetic column level gauge.

[0069] This application designs an automatic detection device based on the manual detection steps of the float valve of the hydrogen side oil return control box of the steam turbine generator, which can automatically fill the hydrogen side oil return control box with liquid and gas and accurately calibrate the opening and closing liquid level of the float valve according to the manual detection steps. It mainly uses PLC to automatically control the oil pump and control valve to transport oil and gas in steps, and uses the flow pressure sensor to calculate and record the moment of opening and closing of the float valve and the corresponding liquid level. For the convenience of understanding, a detailed description will be given below.

[0070] One aspect of the present application provides a float valve detection device for a hydrogen side oil return control box, such as Figure 2 As shown, one of the preferred embodiments includes a hydraulic oil tank V11, an air source, an oil injection circuit and a ventilation circuit. The first branch connected to the oil discharge float valve V0A in the hydrogen side oil return control box and the second branch connected to the oil replenishment float valve V0B are both connected to the hydraulic oil tank V11. The first branch is used for oil discharge from the hydrogen side oil return control box, and the second branch is used for oil replenishment from the hydrogen side oil return control box. One end of the oil injection circuit is connected to the hydraulic oil tank V11, and the other end is connected to the hydrogen side oil return control box. The hydrogen side oil return control box is connected to the air source through a ventilation circuit. The opening and closing sequence of the first branch, the second branch, the oil injection circuit and the ventilation circuit is controlled to perform an opening and closing test of the oil discharge float valve V0A and a functional test of the oil replenishment float valve V0B.

[0071] It is understandable that when the hydrogen side oil return control box needs to be inspected, it is only necessary to connect the hydrogen side oil return control box with the oil filling circuit and the ventilation circuit of the float valve detection device of the present application, and at the same time connect the float valve of the hydrogen side oil return control box to the hydraulic oil tank V11 through the corresponding branch, and then only by automatically controlling the conduction and cutoff sequence of the first branch, the second branch, the oil filling circuit and the ventilation circuit, the steps of manual inspection can be simulated. There is no need for manual frequent operations, which can reduce the intensity of manual labor and the generation of oil pollution on site.

[0072] It should be known that if Figure 2As shown, the opening and closing sequence control of the first branch, the second branch, the oil injection circuit and the ventilation circuit can be realized by the control cabinet V14, and the control cabinet V14 is provided with an operation panel, which can display the operating status of each device in the float valve detection device of the present application, and can control the operating mode of each device through a touch screen or a control key. The specific structure and working principle of the control cabinet V14 are well-known technologies for those skilled in the art, so they will not be elaborated in detail here.

[0073] In this embodiment, Figure 2 As shown, in order to ensure the smooth detection of the float valve of the hydrogen side oil return control box, it is necessary to ensure that there is enough oil in the hydraulic oil tank V11, and the oil temperature in the hydraulic oil tank V11 also needs to meet the requirements. Therefore, in this embodiment, a heater V12 and a liquid level temperature sensor V13 are installed in the hydraulic oil tank V11, and the float valve detection device also includes an oil filling circuit, one end of the oil filling circuit is connected to the hydraulic oil tank V11, and the other end is connected to the oil barrel on site. The liquid level temperature sensor V13 can be used to monitor the liquid level and temperature of the oil in the hydraulic oil tank V11. When the liquid level in the hydraulic oil tank V11 is lower than the set minimum position, the oil filling circuit will be started so that the oil in the on-site oil barrel will be pumped into the hydraulic oil tank V11 until the liquid level in the hydraulic oil tank V11 rises to the set position to prevent the oil pump group V20 of the oil filling circuit from sucking air; when the oil temperature in the hydraulic oil tank V11 is too low, the heater V12 will be started to heat the oil in the hydraulic oil tank V11 to the set temperature.

[0074] Specifically, Figure 2 As shown, the oil filling circuit includes a refueling pump group V30, the input end of which is connected to the oil barrel on site, and the output end is connected to the hydraulic oil tank V11. When it is necessary to add oil to the hydraulic oil tank V11, the refueling pump group V30 can be started to pump the oil in the oil barrel into the hydraulic oil tank V11.

[0075] In this embodiment, Figure 2 As shown, the specific structures of the first branch and the second branch respectively connected to the oil discharge float valve V0A and the oil replenishment float valve V0B are the same, and both include an electromagnetic reversing valve V01, a pressure sensor V02 and a flow sensor V03 connected in sequence. The electromagnetic reversing valve V01 is close to the float valve, and the electromagnetic reversing valve V01 can control the conduction or cutoff of the branch. The pressure sensor V02 is used to detect the oil pressure of the branch. The flow sensor V03 is used to detect the oil flow of the hydrogen side return oil control box flowing to the hydraulic oil tank V11 through the first branch or the second branch, and calculates the liquid level height of the remaining oil in the hydrogen side return oil control box based on the detected oil flow.

[0076] It should be known that the electromagnetic reversing valve V01 can replace the special oil drain plug in the manual inspection step. It should be known that in order to ensure the working safety of the steam turbine generator, the internal sensor of the hydrogen side oil return control box is not allowed to be connected externally. Therefore, this embodiment can use the oil flow data detected by the flow sensor V03 to calculate the liquid level of the oil in the hydrogen side oil return control box, which can avoid the external connection of the liquid level meter inside the hydrogen side oil return control box.

[0077] It can be understood that the basic principle of calculating the oil level in the hydrogen side oil return control box using the oil flow data detected by the flow sensor V03 is: the flow data of the flow sensor V03 per unit time can be used to calculate the amount of oil discharged by the hydrogen side oil return control box per unit time, and then the calculation formula for the internal space of the hydrogen side oil return control box can be used to invert the calculation formula for the oil capacity in the hydrogen side oil return control box, thereby obtaining the oil level inside the hydrogen side oil return control box.

[0078] Specifically, before the oil discharge float valve V0A and the oil replenishment float valve V0B are opened and closed, the liquid level in the hydrogen side oil return control box is calibrated as V. Then, during the test, the calculation formula based on the amount of oil discharged from the hydrogen side oil return control box and the oil flow Q detected by the flow sensor V03 is used to calculate the liquid level h of the remaining oil in the hydrogen side oil return control box. For easy understanding, the following will describe in detail the derivation process of the calculation formula for the liquid level h through the specific structure of the hydrogen side oil return control box.

[0079] Generally speaking, the hydrogen side oil return control box adopts a cylindrical box structure. Therefore, in this embodiment, a horizontal cylindrical box structure is adopted for the hydrogen side oil return control box. The zero point of the liquid level is located at the center point of the cross section of the hydrogen side oil return control box, so that it is consistent with the zero point of the magnetic flap level gauge and the DCS level sensor on site. Since the center point of the cross section of the hydrogen side oil return control box is the zero point of the level gauge, the liquid level height h can be set as the height from the liquid surface to the center point of the cross section of the hydrogen side oil return control box. Assuming that the oil calibration time of the hydrogen side oil return control box is t1, the liquid level height h of the remaining oil in the hydrogen side oil return control box needs to be calculated when the oil is continuously discharged until t2. There are mainly two situations for the liquid level height h of the remaining oil in the hydrogen side oil return control box at t2. The first one is as follows: Figure 3 As shown in the figure, the oil level in the hydrogen side oil return control box is lower than the cross-sectional midpoint of the hydrogen side oil return control box. Figure 4 As shown, the liquid level in the hydrogen side oil return control box is higher than the cross-sectional midpoint of the hydrogen side oil return control box. For the first case, the liquid level height h takes a negative value, and for the second case, the liquid level height h takes a positive value. Then the calculation formula for the remaining oil volume V1 in the hydrogen side oil return control box is as follows:

[0080] .

[0081] Wherein, L represents the horizontal length of the hydrogen side oil return control box, and r represents the cross-sectional radius of the hydrogen side oil return control box.

[0082] Since the flow data detected by the flow sensor V03 is not necessarily a constant value, the oil volume V2 flowing through the pipeline per unit time can be calculated by integration, that is, the oil flow rate flowing out of the hydrogen side return oil control box from t1 to t2; the specific calculation formula of V2 is as follows:

[0083] .

[0084] Based on the above calculation formula, it can be known that if there is no leakage during the test of the first branch or the second branch, then in theory the oil volume discharged by the hydrogen side return oil control box during the time from t1 to t2 should be equal to the oil volume detected by the flow sensor V03 during the time from t1 to t2, that is, V2=V-V1; and then the value of the internal oil level height h of the hydrogen side return oil control box at time t2 can be calculated.

[0085] In this embodiment, in order to facilitate the determination of the oil flow conditions in the first branch and the second branch, as shown in FIG. Figure 2 As shown, a sight glass V04 may be provided in the first branch and the second branch. At the same time, in order to prevent the oil in the pipelines in the first branch and the second branch from flowing out too quickly, so that the flow sensor V03 cannot collect the oil flow in the pipeline, a throttle valve V05 may be provided in the first branch and the second branch, and the flow of the oil in the first branch and the second branch may be controlled by controlling the opening of the throttle valve V05.

[0086] In this embodiment, there are many structures of the oil injection circuit that can achieve the above functions. For the sake of easy understanding, one of the structures will be described in detail below. Figure 2 As shown, the oil injection circuit includes an oil pump group V20, an electromagnetic reversing valve V25 and a flow sensor V27 which are connected in sequence. The oil pump group V20 can pump the oil in the hydraulic oil tank V11 along the pipeline of the oil injection circuit to the hydrogen side oil return control box; the electromagnetic reversing valve V25 can control the conduction or cutoff of the oil injection circuit; the flow sensor V27 can detect the oil flow through the oil injection circuit, and calculate the amount of oil injected into the hydrogen side oil return control box based on the detection result.

[0087] It is understandable that when the oil pump group V20 injects oil into the hydrogen side oil return control box, the oil volume in the hydrogen side oil return control box can be calibrated by calculating the amount of oil injected into the hydrogen side oil return control box according to the detection result of the flow sensor V27. On the one hand, the liquid level height in the hydrogen side oil return control box can be calculated in the process of float valve detection in combination with the detection data of the flow sensor V03, and on the other hand, it can monitor whether the oil injection circuit is normal. The calculation formula for the amount of oil injected into the hydrogen side oil return control box by the flow sensor V27 can refer to the calculation formula of the above-mentioned flow sensor V03.

[0088] It should be known that in order to ensure the safety of the oil injection circuit during the oil injection process into the hydrogen side return oil control box, Figure 2 As shown, the oil injection circuit also includes an overflow valve V21, a hydraulic filter V22, a pressure sensor V23, a pressure gauge V24, a throttle valve V26, a check valve V28 and an oil inlet ball valve V29. The overflow valve V21 is connected in parallel to the output end of the oil pump group V20. The overflow valve V21 can prevent the oil injection circuit from being overloaded due to excessive pressure. When the pipeline pressure of the oil injection circuit is greater than the opening pressure of the overflow valve V21, the overflow valve V21 will open, thereby returning part of the over-pressure oil in the oil injection circuit to the hydraulic oil tank V11. The hydraulic filter V22 can filter the oil in the hydraulic oil tank V11 to prevent the input of dirty oil into the hydrogen side return oil control box. The pressure sensor V23 is used to detect the input pressure of the oil injection circuit. If the pressure is too high, an alarm will be issued to prevent the oil pump group V20 from being overloaded. The pressure gauge V24 is used to facilitate the staff to visually observe the pipeline pressure of the oil injection circuit. The throttle valve V26 can control the flow rate of the oil injection circuit input to the hydrogen side oil return control box to prevent the flow sensor V27 from being unable to detect data due to excessive flow. The one-way valve V28 can prevent the oil in the pipeline of the oil injection circuit from flowing backward due to gas pressure. The oil inlet ball valve V29 can cut off the oil injection circuit when replacing the one-way valve V28.

[0089] In this embodiment, there are many specific structures of the ventilation circuit that can achieve the above functions. For the sake of easy understanding, the following will be described in detail using one specific structure. Figure 2As shown, the ventilation circuit includes a ventilation branch and an exhaust branch connected in parallel; the ventilation branch is connected between the hydrogen side oil return control box and the gas source, and the exhaust branch connects the hydrogen side oil return control box to the outside world. The exhaust branch includes an electromagnetic ventilation valve V51 and an oil mist separator V50 connected in sequence; when the oil discharge float valve V0A is opened, the electromagnetic ventilation valve V51 is suitable for controlling the exhaust branch to conduct exhaust. The ventilation branch includes a switch valve V41 and an electromagnetic ventilation valve group connected in sequence. When the oil discharge float valve V0A is closed and the oil replenishment float valve V0B is functionally tested, the electromagnetic ventilation valve group can control the ventilation branch to conduct, and then the gas source can inflate the hydrogen side oil return control box to the set pressure.

[0090] It should be known that the gas source for charging the hydrogen side oil return control box is generally an inert gas, such as nitrogen, etc. The gas source may be a nitrogen bottle V40. The nitrogen bottle V40 may be connected to the ventilation circuit via a manual switch valve V41, so that the output or shutoff of nitrogen in the nitrogen bottle V40 may be controlled via the manual switch valve V41.

[0091] At the same time, in the ventilation branch, in order to avoid the backflow of oil-containing gas when the ventilation valve is closed, an electromagnetic ventilation valve group including multiple ventilation rings is set. For ease of understanding, one of the specific examples, such as Figure 2 As shown, the electromagnetic ventilation valve group includes electromagnetic ventilation valve V46 and electromagnetic ventilation valve V49. The electromagnetic ventilation valve V46 is close to the nitrogen bottle V40. When the electromagnetic ventilation valve V46 is energized, it can control the nitrogen in the nitrogen bottle V40 to supply gas to the hydrogen side oil return control box. When it loses power, it stops the gas supply. It is mainly used to cut off the nitrogen when the entire device stops supplying gas after completing the test. The electromagnetic ventilation valve V49 also obtains gas supply and stops the gas supply when it loses power. The electromagnetic ventilation valve V49 can be energized and de-energized synchronously with the electromagnetic ventilation valve V46 to prevent the oil-containing gas in the hydrogen side oil return control box from flowing out in the opposite direction after the electromagnetic ventilation valve V46 cuts off the gas supply to the ventilation branch.

[0092] It should also be known that in order to ensure the safety of the oil injection circuit during the oil injection process into the hydrogen side return oil control box, Figure 2As shown, the ventilation circuit also includes a pressure gauge V42, a pressure reducing valve V43, a pressure gauge V44, a gas filter V45, a pressure gauge V47, a proportional pressure reducing valve V48, an oil mist separator V50, a pressure sensor V52, an intake ball valve V53 and an exhaust ball valve V54. Among them, the pressure gauge V42 is used to monitor the pressure of the nitrogen cylinder V40, and the nitrogen cylinder V40 needs to be replaced when the pressure is too low. The pressure reducing valve V43 is a manual pressure reducing valve, which can reduce the high-pressure gas in the nitrogen cylinder V40 to a range suitable for the proportional pressure reducing valve V48 to withstand. The pressure gauge V44 is used to monitor the pressure at the output end of the pressure reducing valve V43, which is used to help adjust the pressure reducing valve V43. The gas filter V45 is used to filter the nitrogen output from the nitrogen cylinder V40. The pressure gauge V47 is used to monitor the pressure before the proportional pressure reducing valve V48, so as to facilitate the replacement of the proportional pressure reducing valve V48. The proportional pressure reducing gas valve V48 is used to control the gas pressure input into the hydrogen side oil return control box to reach the set numerical requirements. The oil mist separator V50 is used to filter the oil-containing gas discharged from the hydrogen side oil return control box to prevent the oil mist from being discharged into the air. The pressure sensor V52 is used to monitor the gas pressure in the hydrogen side oil return control box to achieve closed-loop control. The inlet ball valve V53 is a manual valve that can manually control the hydrogen side oil return control box to input or close the gas to prevent the electromagnetic ventilation valve V49 from failing or losing power and being unable to close. The exhaust ball valve V54 is also a manual valve that can control the hydrogen side oil return control box to conduct the exhaust to prevent the electromagnetic ventilation valve V51 from failing or losing power and being unable to close.

[0093] Another aspect of the present application provides a working method of the above-mentioned float valve detection device of the hydrogen side oil return control box, such as Figure 5 As shown, one of the preferred embodiments includes the following steps:

[0094] S100: Detect and process the oil volume and temperature in the hydraulic oil tank V11, and proceed to step S200 after the oil volume and temperature in the hydraulic oil tank V11 meet the requirements.

[0095] S200: The first branch is turned on and the second branch is turned off. Oil is injected into the oil return control box on the hydrogen side through the oil injection circuit. The oil pressure and oil flow in the oil injection circuit and the first branch are used to test the opening of the oil drain float valve V0A.

[0096] S300: After completing the opening test of the oil drain float valve V0A, the oil filling circuit is cut off, and then the ventilation circuit is opened to inflate the hydrogen side return oil control box to the set pressure, and the closing of the oil drain float valve V0A is tested based on the oil pressure and oil flow in the first branch.

[0097] S400: After completing the closing test of the oil drain float valve V0A, the second branch is opened, and the opening of the oil replenishment float valve V0B is tested based on the oil pressure and oil flow in the second branch.

[0098] S500: After completing the opening test of the oil replenishment float valve V0B, the hydrogen side oil return control box is emptied. After completing the emptying of the hydrogen side oil return control box, the oil circuit is removed to end the test.

[0099] It should be known that before testing the float valve of the hydrogen side oil return control box, it is necessary to ensure that the connection of the pipeline and circuit structure of the entire float valve detection device is safe. At the same time, it is also necessary to ensure that the oil volume and oil temperature in the hydraulic oil tank V11 meet the test requirements before the float valve can be tested. Therefore, step S100 can include the following specific processes:

[0100] S110: Confirm that the oil pipe of the float valve detection device and the quick plug of the external electrical components of the control cabinet V14 have been connected, and open all the ball valves.

[0101] S120: Power on the equipment, i.e., the float valve detection device, and select to enter the automatic mode after initializing the control system of the control cabinet V14.

[0102] S130: Detect whether the oil level of the hydraulic oil tank V11 reaches the high liquid level through the liquid level temperature sensor V13; if not, start the refueling pump group V30 of the oil filling circuit to pump the oil in the on-site oil barrel into the hydraulic oil tank V11 until the oil level of the hydraulic oil tank V11 reaches the set high liquid level requirement and then shut down the refueling pump group V30.

[0103] S140: Detect whether the oil temperature in the hydraulic oil tank V11 reaches an appropriate value through the liquid level temperature sensor V13; if not, start the heater V12 to heat the oil in the hydraulic oil tank V11 until the oil temperature in the hydraulic oil tank V11 reaches the set appropriate value, and then turn off the heater V12 to stop heating.

[0104] S150: After completing the oil level detection and adjustment and temperature detection and adjustment of the hydraulic oil tank V11, the control cabinet V14 can control the sound and light alarm prompts and start the test.

[0105] It can be understood that the oil discharge float valve V0A is mainly used for the oil discharge of the hydrogen side oil return control box, that is, when the liquid level of the oil in the hydrogen side oil return control box is too high, the oil discharge float valve V0A will automatically open the oil discharge port of the hydrogen side oil return control box. The oil replenishment float valve V0B is mainly used for the oil replenishment of the hydrogen side oil return control box, that is, when the liquid level of the oil in the hydrogen side oil return control box is too low, the oil replenishment float valve V0B will automatically open the oil replenishment port of the hydrogen side oil return control box. Therefore, when testing the hydrogen side oil return control box, it is mainly to test whether the functions of the oil discharge float valve V0A and the oil replenishment float valve V0B can be realized, that is, to test whether the opening and closing functions of the oil discharge float valve V0A and the oil replenishment float valve V0B are normal. For the convenience of understanding, the specific function test process of the oil discharge float valve V0A and the oil replenishment float valve V0B will be described in detail below.

[0106] In this embodiment, after completing the detection and processing of the hydraulic oil tank V11, the opening function of the oil discharge float valve V0A may be tested first. Then step S200 includes the following specific processes:

[0107] S210: Open the electromagnetic reversing valve V01 of the first branch, and close the electromagnetic reversing valve V01 of the second branch.

[0108] Specifically, by clicking on the operation panel of the control cabinet V14, the oil filling process of the hydrogen side oil return control box test program is entered. By operating on the operation panel of the control cabinet V14, the electromagnetic reversing valve V01 in the first branch is controlled to be opened, and the electromagnetic reversing valve V01 in the second branch is kept closed without electricity. This step may correspond to step (2) of the manual inspection.

[0109] S220: Open the electromagnetic reversing valve V25 of the oil injection circuit and the electromagnetic ventilation valve V51 of the ventilation circuit, start the oil transfer pump group V20 to inject oil into the hydrogen side return oil control box, and monitor the oil injection amount through the flow sensor V27.

[0110] It should be noted that since the hydrogen side oil return control box is sealed, exhaust is required during oil injection. Therefore, when performing step S220, the electromagnetic ventilation valve V51 of the exhaust branch needs to be opened; this step may correspond to step (3) of the manual inspection.

[0111] S230: When the values ​​monitored by the pressure sensor V02 and the flow sensor V03 of the first branch are both less than or equal to the first threshold, and the oil injection amount monitored by the flow sensor V27 exceeds the second threshold, it is determined that the opening of the oil drain float valve V0A fails and the test is suspended, otherwise step S240 is performed.

[0112] It should be noted that the specific values ​​of the first threshold and the second threshold can be selected according to the actual needs of technicians in this field; the first thresholds corresponding to the pressure sensor V02 and the flow sensor V03 are different. If the opening function of the oil discharge float valve V0A is normal, then in theory the oil in the hydrogen side return oil control box will flow from the first branch to the hydraulic oil tank V11. At this time, the pressure sensor V02 and the flow sensor V03 in the first branch should detect a larger pressure and flow, that is, the monitoring values ​​of the pressure sensor V02 and the flow sensor V03 should be greater than the first threshold. If the monitoring values ​​of the pressure sensor V02 and the flow sensor V03 are less than or equal to the first threshold, it means that the amount of oil in the first branch is small at this time. It may be that the oil in the hydrogen side return oil control box has not reached the opening height of the oil discharge float valve V0A, or it may be that the oil discharge float valve V0A is faulty. Therefore, it is necessary to calculate the oil level in the hydrogen side return oil control box according to the monitoring data of the flow sensor V27 in the oil filling circuit. The specific calculation process can refer to the above formula; if the calculation result shows that the oil level in the hydrogen side return oil control box is greater than the set second threshold, and the second threshold is higher than the opening height of the oil drain float valve V0A, then it can be said that the oil drain float valve V0A has a fault and cannot be opened, and the test needs to be suspended at this time.

[0113] S240: Close the electromagnetic reversing valve V25 to cut off refueling, close the electromagnetic reversing valve V01 of the first branch, record that the oil drain float valve V0A has been opened and the liquid level height in the hydrogen side return oil control box calculated by the oil injection amount monitored by the flow sensor V27; after the on-site personnel calibrate the value of the liquid level meter in the hydrogen side return oil control box with the calculated liquid level height value, proceed to step 250.

[0114] It should be noted that in order to ensure the safety of the test process, the data on the liquid level height in the hydrogen side return oil control box calculated by the flow sensor V27 and the flow sensor V01 need to be compared by the on-site personnel with the value of the liquid level meter in the hydrogen side return oil control box. Only after confirming that the comparison is correct can the subsequent steps be continued; double verification is achieved through the value of the on-site liquid level meter and the calculated liquid level value; this step can correspond to part of the process of steps (4) and (5) of manual inspection.

[0115] S250: Reopen the electromagnetic reversing valve V25 to continue to inject oil into the hydrogen side oil return control box, and continuously monitor the oil injection amount through the flow sensor V27 and calculate the liquid level in the hydrogen side oil return control box. When the oil level in the hydrogen side oil return control box rises to the set value, close the electromagnetic reversing valve V25 and the oil pump group V20 to complete the opening test of the oil discharge float valve V0A.

[0116] It should be noted that this step may correspond to a part of the process of the manual inspection step (5); the set value for the rise in the liquid level height in the hydrogen side return oil control box may be selected according to the actual needs of technical personnel in this field; for example, the manual inspection step (5) may be referred to, and finally the liquid level height in the hydrogen side return oil control box will rise to 10 mm higher than the opening level of the oil drain float valve V0A, that is, the set value is the opening level of the oil drain float valve V0A plus 10 mm.

[0117] In this embodiment, after completing the opening test of the oil drain float valve V0A, it is necessary to test the closing of the oil drain float valve V0A. Simply put, the oil in the hydrogen side oil return control box is discharged to observe whether the oil drain float valve V0A can be closed normally. In order to speed up the test process and simulate the actual working conditions, the closing test of the oil drain float valve V0A needs to simulate a high-pressure environment. Step S300 includes the following specific processes:

[0118] S310: Open the electromagnetic ventilation valve group of the ventilation circuit to allow the gas source to inflate the hydrogen side oil return control box.

[0119] S320: By adjusting the proportional pressure reducing valve V48 in the ventilation circuit, the air pressure in the hydrogen side return oil control box reaches the set pressure value.

[0120] Specifically, steps S310 and S320 correspond to the remaining process of step (5) of manual inspection. When performing steps S310 and S320, the electromagnetic ventilation valves V46 and V49 in the ventilation branch can be opened, and then the opening of the proportional pressure reducing valve V48 can be controlled on the operation panel of the control cabinet V14 according to the set pressure value. The air pressure setting value in the hydrogen side return oil control box can be selected according to the actual needs of technicians in this field. For example, the air pressure of 5.2 bar in step (5) of manual inspection can be referred to, that is, in step S320, the air pressure in the hydrogen side return oil control box needs to be filled to 5.2 bar.

[0121] S330: Open the electromagnetic reversing valve V01 in the first branch, and record the values ​​of the pressure sensor V02 and the flow sensor V03 in the first branch.

[0122] It is important to note that this step corresponds to the manual inspection step (6).

[0123] S340: When the values ​​of the pressure sensor V02 and the flow sensor V03 in the first branch are both reduced to 0, the current oil level in the hydrogen side return oil control box is calculated based on the recorded flow data of the flow sensor V03.

[0124] It should be noted that after the solenoid reversing valve V01 in the first branch is opened, the oil in the hydrogen side return oil control box will be quickly discharged from the oil drain port of the oil drain float valve V0A under a high pressure of 5.2 bar. Therefore, for the pressure sensor V02 and flow sensor V03 in the first branch, their monitored values ​​will gradually decrease to 0.

[0125] S350: After checking the calculated oil level height in the hydrogen side return oil control box with the value of the on-site liquid level meter, it is determined that the oil drain float valve V0A has been closed, and the closing test of the oil drain float valve V0A is completed.

[0126] It should be noted that, in order to ensure safety, a double check of the liquid level height is required, which is the same as the above step S240. When the monitoring values ​​of the pressure sensor V02 and the flow sensor V03 in the first branch are 0, it is theoretically shown that the oil in the hydrogen side return oil control box has dropped below the opening liquid level of the oil discharge float valve V0A, making the oil discharge float valve V0A in a closed state, but it may also be that the oil discharge float valve V0A has a fault, causing the liquid level to close before it drops below the opening liquid level, so it is also necessary to calculate the liquid level height in the hydrogen side return oil control box, and make a comprehensive judgment based on the calculated results.

[0127] In this embodiment, after the opening and closing test of the oil discharge float valve V0A is completed, the functional test of the oil supply float valve V0B can be entered. Step S400 includes the following specific processes:

[0128] S410: Open the electromagnetic reversing valve V01 of the second branch, and record the values ​​of the pressure sensor V02 and the flow sensor V03 in the second branch.

[0129] Specifically, the electromagnetic reversing valve V01 in the second branch can be controlled to be opened on the operation panel of the control cabinet V14; this step may correspond to step (7) in the manual inspection.

[0130] S420: If the recorded values ​​of the pressure sensor V02 and the flow sensor V03 in the second branch are less than or equal to the third threshold, it is determined that the internal leakage of the oil replenishment float valve V0B is too large, otherwise, step S430 is performed.

[0131] It is understandable that the specific value of the third threshold value can be selected according to the actual needs of those skilled in the art. After the electromagnetic reversing valve V01 in the second branch is opened, theoretically, the values ​​of the pressure sensor V02 and the flow sensor V03 in the second branch should be greater than the third threshold value; if the values ​​of the pressure sensor V02 and the flow sensor V03 are less than the third threshold value, it means that the oil replenishment float valve V0B has an internal leakage, resulting in a decrease in the amount of oil in the second branch. At this time, the operator needs to check and handle the oil replenishment float valve V0B.

[0132] S430: After confirming that there is no internal leakage in the oil replenishing float valve V0B, the electromagnetic reversing valve V01 in the first branch is closed after the set time t and the oil discharging float valve V0A is manually opened on site.

[0133] It is understandable that this step corresponds to part of the process of step (8) in the manual inspection. The set time t can be selected according to the actual needs of those skilled in the art, for example, t can be selected from 5s, 10s and 20s.

[0134] S440: After the oil drain float valve V0A is manually opened, the electromagnetic reversing valve V01 in the first branch is opened again, and the data of the flow sensor V03 in the first branch is recorded to calculate the current liquid level of the oil in the hydrogen side return oil control box.

[0135] S450: When the oil level in the hydrogen side return oil control box drops to the set fourth threshold, and the values ​​of the pressure sensor V02 and the flow sensor V03 in the second branch are less than or equal to the fifth threshold, it is determined that the oil replenishment float valve V0B fails and does not open; otherwise, it is determined that the oil replenishment float valve V0B is open.

[0136] It can be understood that when the oil discharge float valve V0A and the corresponding first branch are opened for conduction by the corresponding electromagnetic reversing valve V01, the oil in the hydrogen side return oil control box will be discharged into the hydraulic oil tank V11 along the first branch; and as the oil level in the hydrogen side return oil control box decreases until it reaches the opening height of the oil replenishment float valve V0B, that is, the fourth threshold, the oil replenishment float valve V0B theoretically needs to be opened so that the second branch replenishes oil to the hydrogen side return oil control box; at this time, if the oil replenishment float valve V0B is opened normally, then the corresponding values ​​monitored by the pressure sensor V02 and the flow sensor V03 in the second branch should be greater than the fifth threshold; if the corresponding values ​​monitored by the pressure sensor V02 and the flow sensor V03 in the second branch are less than or equal to the fifth threshold, it means that the oil replenishment float valve V0B fails to open. The specific values ​​of the fourth threshold and the fifth threshold can be selected according to the actual needs of technicians in this field. This step can correspond to part of the process of step (8) in manual inspection.

[0137] S460: Close the electromagnetic reversing valve V01 in the first branch and the second branch, and the functional test of the oil replenishing float valve V0B is completed.

[0138] In this embodiment, after completing the test of the float valve of the hydrogen side oil return control box, it is necessary to empty the hydrogen side oil return control box, that is, empty the test oil in the hydrogen side oil return control box, which specifically includes the following process:

[0139] The electromagnetic reversing valve V01 in the first branch and the second branch is powered on and opened, and the values ​​of the flow sensors V03 in the first branch and the second branch are recorded. When the monitoring values ​​of the flow sensors V03 in the first branch and the second branch suddenly increase, it indicates that the oil in the hydrogen side oil return control box has been emptied. Specifically, when the oil in the hydrogen side oil return control box is emptied, only gas will remain in the hydrogen side oil return control box, which will cause the gas flow in the pipeline to suddenly increase.

[0140] After judging that the hydrogen side oil return control box has been emptied, the electromagnetic reversing valve V01 in the first branch and the second branch is de-energized and closed, and then the electromagnetic exhaust valve V51 is energized and opened to release the gas in the hydrogen side oil return control box. When the monitoring value of the pressure sensor V52 in the exhaust branch is 0, it means that the gas in the hydrogen side oil return control box has been emptied. At this time, the whole test process is completed, and then the pipeline and circuit are removed to end the test.

[0141] The above describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited by the above embodiments, and the above embodiments and the specification only describe the principles of the present application. The present application may have various changes and improvements without departing from the spirit and scope of the present application, and these changes and improvements fall within the scope of the present application for which protection is sought. The scope of protection claimed by the present application is defined by the attached claims and their equivalents.

Claims

1. A float valve detection device for a hydrogen side oil return control box, characterized in that: It includes a hydraulic oil tank (V11), an air source, an oil injection circuit and a ventilation circuit; A first branch connected to the oil drain float valve (V0A) and a second branch connected to the oil replenishment float valve (V0B) in the hydrogen side oil return control box are both connected to the hydraulic oil tank (V11); One end of the oil injection circuit is connected to the hydraulic oil tank (V11), and the other end is connected to the hydrogen side oil return control box, and the hydrogen side oil return control box is connected to the gas source through the ventilation circuit; Performing a functional test of the oil drain float valve (V0A) and the oil replenishment float valve (V0B) by controlling the opening and closing sequence of the first branch, the second branch, the oil injection circuit, and the ventilation circuit; The first branch and the second branch each include an electromagnetic reversing valve (V01), a pressure sensor (V02) and a flow sensor (V03) which are connected in sequence; The electromagnetic reversing valve (V01) is suitable for controlling the conduction and cutoff of the first branch or the second branch, the pressure sensor (V02) is used to detect the oil pressure of the first branch or the second branch, and the flow sensor (V03) is used to detect the oil flow rate of the hydrogen side return oil control box flowing to the hydraulic oil tank (V11) through the first branch or the second branch, and calculate the liquid level height of the remaining oil in the hydrogen side return oil control box based on the detected oil flow rate; Before the oil discharge float valve (V0A) and the oil supply float valve (V0B) are opened and closed, the liquid level in the hydrogen side return oil control box is calibrated as V; Furthermore, during the test, the amount of oil discharged from the hydrogen side oil return control box and the oil flow rate Q detected by the flow sensor (V03) are combined to calculate the liquid level height h of the remaining oil in the hydrogen side oil return control box; The hydrogen side oil return control box adopts a horizontal cylindrical box structure. The zero point of the liquid level is located at the center point of the cross section of the hydrogen side oil return control box, which is consistent with the zero point of the magnetic flap level gauge and DCS liquid level sensor on site; the liquid level height h is the height from the liquid surface to the center point of the cross section of the hydrogen side oil return control box. The calculation formula for the liquid level height h of the remaining oil in the hydrogen side oil return control box from the time t1 when the calibration is completed to the time t2 is as follows: ； ； V2=V-V1; Wherein, V1 represents the remaining oil volume in the hydrogen side oil return control box, V2 represents the oil flow rate out of the hydrogen side oil return control box from t1 to t2, r represents the cross-sectional radius of the hydrogen side oil return control box, and L represents the horizontal length of the hydrogen side oil return control box; The ventilation circuit comprises a ventilation branch and an exhaust branch connected in parallel with each other; The ventilation branch is connected between the hydrogen side oil return control box and the gas source, and the exhaust branch connects the hydrogen side oil return control box with the outside world; The ventilation branch includes a switch valve (V41) and an electromagnetic ventilation valve group connected in sequence, and the exhaust branch includes an electromagnetic ventilation valve (V51) and an oil mist separator (V50) connected in sequence; When the opening test of the oil discharge float valve (V0A) is performed, the electromagnetic ventilation valve (V51) is suitable for controlling the exhaust branch to conduct exhaust; When performing the closing test of the oil drain float valve (V0A) and the functional test of the oil replenishment float valve (V0B), the electromagnetic ventilation valve group is suitable for controlling the ventilation branch to be connected, so that the gas source inflates the hydrogen side oil return control box to the set pressure.

2. The float valve detection device of the hydrogen side oil return control box according to claim 1 is characterized in that: The oil injection circuit comprises an oil delivery pump group (V20), an electromagnetic reversing valve (V25) and a flow sensor (V27) which are connected in sequence; The oil delivery pump group (V20) is suitable for pumping the oil in the hydraulic oil tank (V11) along the oil injection circuit to the hydrogen side oil return control box, and the electromagnetic reversing valve (V25) is suitable for controlling the conduction or cutoff of the oil injection circuit; The flow sensor (V27) is suitable for detecting the oil flow rate flowing through the oil injection circuit and calculating the amount of oil injected into the hydrogen side oil return control box based on the detection result.

3. A working method of the float valve detection device of the hydrogen side oil return control box as claimed in claim 1 or 2, characterized in that: The steps include: S100: detecting and processing the oil volume and temperature in the hydraulic oil tank (V11), and performing step S200 after the oil volume and temperature in the hydraulic oil tank (V11) meet the requirements; S200: The first branch is turned on, the second branch is turned off, oil is injected into the oil return control box on the hydrogen side through the oil injection circuit, and the oil pressure and oil flow in the oil injection circuit and the first branch are used to test the opening of the oil discharge float valve (V0A); S300: After completing the opening test of the oil discharge float valve (V0A), the oil filling circuit is cut off, and then the ventilation circuit is opened to inflate the hydrogen side oil return control box to the set pressure, and the closing of the oil discharge float valve (V0A) is tested based on the oil pressure and oil flow in the first branch; S400: After completing the closing test of the oil discharge float valve (V0A), the second branch is conducted, and the opening of the oil supply float valve (V0B) is tested based on the oil pressure and oil flow in the second branch; S500: After completing the opening test of the oil replenishment float valve (V0B), the hydrogen side oil return control box is emptied. After completing the emptying of the hydrogen side oil return control box, the oil circuit is removed to end the test.

4. The working method of the float valve detection device of the hydrogen side oil return control box according to claim 3 is characterized in that: Step S200 includes the following specific processes: S210: Open the electromagnetic reversing valve (V01) of the first branch, and close the electromagnetic reversing valve (V01) of the second branch; S220: Open the electromagnetic reversing valve (V25) of the oil injection circuit and the electromagnetic ventilation valve (V51) of the ventilation circuit, start the oil delivery pump group V20 to inject oil into the hydrogen side return oil control box, and monitor the oil injection amount through the flow sensor (V27); S230: When the values ​​monitored by the pressure sensor (V02) and the flow sensor (V03) of the first branch are both less than or equal to the first threshold, and the oil injection amount monitored by the flow sensor (V27) exceeds the second threshold, it is determined that the opening of the oil discharge float valve (V0A) fails, and the test is suspended, otherwise, step S240 is performed; S240: Close the electromagnetic reversing valve (V25) to cut off the refueling, close the electromagnetic reversing valve (V01) of the first branch, record that the oil discharge float valve (V0A) has been opened and the liquid level height in the hydrogen side return oil control box calculated by the oil injection amount monitored by the flow sensor (V27); after the on-site personnel calibrate the value of the liquid level meter in the hydrogen side return oil control box with the calculated liquid level height value, proceed to step 250; S250: Reopen the electromagnetic reversing valve (V25) to continue to inject oil into the hydrogen side oil return control box, and continuously monitor the oil injection amount through the flow sensor (V27) and calculate the liquid level height in the hydrogen side oil return control box; when it is monitored that the oil level height in the hydrogen side oil return control box rises to the set value, close the electromagnetic reversing valve (V25) and the oil pump group (V20) to complete the opening test of the oil drain float valve (V0A).

5. The working method of the float valve detection device of the hydrogen side oil return control box according to claim 3 is characterized in that: Step S300 includes the following specific processes: S310: Open the electromagnetic ventilation valve group of the ventilation circuit to allow the gas source to inflate the hydrogen side oil return control box; S320: By adjusting the proportional pressure reducing valve (V48) in the ventilation circuit, the air pressure in the hydrogen side return oil control box reaches the set pressure value; S330: Open the electromagnetic reversing valve (V01) in the first branch, and record the values ​​of the pressure sensor (V02) and the flow sensor (V03) in the first branch; S340: When the values ​​of the pressure sensor (V02) and the flow sensor (V03) in the first branch are both reduced to 0, the liquid level height of the oil in the current hydrogen side return oil control box is calculated according to the recorded flow data of the flow sensor (V03); S350: After checking the calculated oil level height in the hydrogen side return oil control box with the value of the on-site liquid level meter, it is determined that the oil drain float valve (V0A) has been closed, and the closing test of the oil drain float valve (V0A) is completed.

6. The working method of the float valve detection device of the hydrogen side oil return control box according to claim 3 is characterized in that: Step S400 includes the following specific processes: S410: Open the electromagnetic reversing valve (V01) of the second branch, and record the values ​​of the pressure sensor (V02) and the flow sensor (V03) in the second branch; S420: If the recorded values ​​of the pressure sensor (V02) and the flow sensor (V03) in the second branch are less than or equal to the third threshold, it is determined that the internal leakage of the oil replenishment float valve (V0B) is too large, otherwise, step S430 is performed; S430: After confirming that there is no internal leakage in the oil replenishment float valve (V0B), the electromagnetic reversing valve V01 in the first branch is closed after the set time t and the oil discharge float valve (V0A) is manually opened on site; S440: After the oil discharge float valve (V0A) is manually opened, the electromagnetic reversing valve (V01) in the first branch is opened again, and the data of the flow sensor (V03) in the first branch is recorded to calculate the current liquid level of the oil in the hydrogen side return oil control box; S450: When the liquid level of the oil in the hydrogen side return oil control box drops to the set fourth threshold value, and the values ​​of the pressure sensor (V02) and the flow sensor (V03) in the second branch are less than or equal to the fifth threshold value, it is determined that the oil replenishment float valve (V0B) fails and is not opened, otherwise it is determined that the oil replenishment float valve (V0B) is opened; S460: Close the electromagnetic reversing valve (V01) in the first branch and the second branch, and the functional test of the oil replenishing float valve (V0B) is completed.

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