Oil pump flow detection device and detection system

Abstract

This invention relates to the field of flow detection technology and discloses an oil pump flow detection device and system, including a flow meter body. The input end of the flow meter body is connected to a gas-liquid separation chamber, and the output end of the flow meter body is connected to a vibration detection tube. It achieves high-precision, interference-resistant flow measurement by integrating a high-efficiency three-stage composite gas-liquid separation chamber with the flow meter body, ensuring from the source that the fluid entering the metering unit is a high-purity liquid phase, guaranteeing long-term stability and reliability of flow data. A metering solenoid valve is integrated into the gas outlet of the gas-liquid separation chamber, not only separating the gas but also accurately measuring the gas flow rate. By fusing the measured gas flow rate with the liquid flow rate, this system can provide the total flow rate and gas volume fraction in the inlet pipeline in real time, upgrading the device from a single-phase flow meter to a cost-effective two-phase flow analysis system.

Description

Technical Field

[0001] This invention relates to the field of flow detection technology, specifically to an oil pump flow detection device and system. Background Technology

[0002] In existing technologies for industrial fluid transport and metering, oil pump flow detection equipment faces the following technical challenges:

[0003] Gas interference leads to measurement inaccuracies: In many practical operating conditions, gas inevitably mixes into the transported oil, forming a two-phase flow. Traditional flow detection methods will produce significant errors under such conditions. For example, volumetric flow meters may miscount the gas volume as the liquid volume, resulting in falsely high measurement results; while velocity flow meters (such as ultrasonic and turbine flow meters) may experience drastic data fluctuations or even complete failure due to signal attenuation caused by gas or impact on the impeller.

[0004] Equipment wear leads to decreased accuracy: The measurement accuracy of a positive displacement flow meter, with a gear pump at its core, depends on the precise fit of its internal mechanical components. With long-term operation, wear occurs between the gears and the pump casing, resulting in increased internal leakage (i.e., slippage). This causes a growing discrepancy between the theoretical flow rate calculated based on rotational speed and the actual flow rate, and current technologies typically lack an effective online monitoring method to quantify and compensate for this wear-induced accuracy degradation in real time.

[0005] Therefore, the market needs a highly integrated intelligent flow detection solution that can overcome gas interference, monitor its own health in real time, and is highly integrated. Summary of the Invention

[0006] This invention provides an oil pump flow detection device and system, which solves the problems mentioned in the background art.

[0007] The present invention provides the following technical solution: an oil pump flow detection device, comprising a flow meter body, wherein the input end of the flow meter body is connected to a gas-liquid separation chamber, and the output end of the flow meter body is connected to a vibration detection tube.

[0008] As a preferred technical solution of the present invention: the flow meter body includes a pump housing, a bottom cover is fixedly mounted on the bottom of the pump housing, a top cover is fixedly mounted on the top of the pump housing, one end of the pump housing is connected to a liquid inlet, the other end of the pump housing is connected to a liquid outlet, and a driving gear and a driven gear are rotatably connected to the inner wall of the pump housing respectively.

[0009] As a preferred embodiment of the present invention: a sensor housing is fixedly mounted on the top of the drive gear, a miniature absolute encoder is fixedly mounted on the top of the drive gear, a sensor circuit board is fixedly mounted on the inner wall of the sensor housing, a display screen is fixedly mounted on the top inner wall of the sensor housing, a shaft hole is opened on the top of the drive gear, a push rod adjusting screw hole is opened on the top of the driven gear, a fixing hole and a tension adjusting hole are also opened on the top of the top of the drive gear, a lever frame is fixedly mounted on the top of the driven gear, one end of a lever arm is rotatably connected to the outer wall of the lever frame, a push rod sliding groove is opened in the middle of the lever arm, and the lever arm... The other end is rotatably connected to a diaphragm connecting arm. A hydrophobic diaphragm is fixedly mounted on the outer wall of the end of the diaphragm connecting arm away from the lever arm. The outer wall of the hydrophobic diaphragm is sleeved on the air guide tube. The air guide tube is fixedly mounted on the inner wall of the fixed hole. One end of the stop rod is slidably sleeved on the inner wall of the push rod groove. The outer wall of the stop rod is sleeved on the push rod adjusting bolt. The push rod adjusting bolt is threadedly connected to the inner wall of the push rod adjusting screw hole. One end of the tension spring is rotatably connected to the lever arm in the middle of the diaphragm connecting arm and the push rod groove. A spring hook is fixedly mounted on the other end of the tension spring. A tension adjusting bolt is rotatably connected to the bottom of the spring hook. The end of the tension adjusting bolt is threadedly connected to the inner wall of the tension adjusting hole.

[0010] As a preferred technical solution of the present invention: the driving gear and the driven gear mesh with each other, the top of the driving gear is rotatably connected to the inner wall of the shaft hole, the bottom of the stop rod abuts against the top of the driven gear, the end of the air guide tube away from the diaphragm connecting arm is located in the cavity of the driving gear and the driven gear near the liquid inlet, the pump housing, bottom cover and top cover are fixedly assembled by bolts, the miniature absolute encoder and the display screen are electrically connected to the sensor circuit board, and the push rod groove is slidably sleeved on the inner wall of the stop rod.

[0011] As a preferred embodiment of the present invention: the gas-liquid separation chamber includes a chamber body, the inner wall of the chamber body is tangentially provided with a fixedly installed tangential liquid inlet pipe, the inner wall of the tangential liquid inlet pipe near the inner cavity of the chamber body is fixedly installed with an inlet guide section, the inner wall of the inlet guide section is fixedly installed with an ultrasonic device, the top of the chamber body is fixedly installed with a metering solenoid valve communicating with the inner cavity of the chamber body, the outlet of the metering solenoid valve is connected to a gas discharge port, the inner wall of the chamber body is fixedly installed with a wire mesh demister, the top of the wire mesh demister is provided with two sets of baffles fixedly installed with the inner wall of the chamber body.

[0012] As a preferred technical solution of the present invention: the two sets of baffles are designed at 180° to each other, and the wire mesh demister is located at the top of the tangential liquid inlet pipe.

[0013] As a preferred embodiment of the present invention: the vibration detection tube includes an outlet pipe, and two sets of sensor mounting seats are fixedly installed on the outer wall of the end of the outlet pipe away from the flow meter body. A vibration sensor is fixedly installed on the inner wall of the sensor mounting seat, and a connecting seat is fixedly installed on the end of the outlet pipe near the sensor mounting seat.

[0014] An oil pump flow detection system: including

[0015] The gas-liquid separation chamber is used to separate the inlet oil-gas mixture into pure liquid and gas, and output a first signal, which is the flow rate value of the separated gas.

[0016] The flow meter body is used to transport pure liquid from the gas-liquid separation chamber and output a second signal, which is the theoretical liquid flow rate value calculated based on the rotational speed of its internal gears;

[0017] A vibration detection tube is connected to the outlet of the flow meter body and is used to output a third signal, which is the actual liquid flow rate value calculated based on the cross-correlation of two sets of vibration sensor signals on its outer wall.

[0018] The processing unit is electrically connected to the gas-liquid separation chamber, the flow meter body, and the vibration detection tube, respectively, and is configured to:

[0019] Receive the first, second, and third signals;

[0020] Based on the first and third signals, calculate the total flow rate and gas volume fraction in the incoming pipeline;

[0021] Based on the difference between the second and third signals, the internal leakage of the flow meter body is calculated, and the wear condition of the flow meter body is diagnosed.

[0022] The present invention has the following beneficial effects:

[0023] 1. This oil pump flow detection equipment and system achieves high-precision, interference-resistant flow measurement. By integrating the high-efficiency three-stage composite gas-liquid separation chamber with the main body of the flow meter, it ensures from the source that the fluid entering the metering unit is a high-purity liquid phase fluid, fundamentally solving the problem of inaccurate measurement caused by gas entrainment in the liquid, and ensuring the long-term stability and reliability of flow data.

[0024] 2. This oil pump flow detection equipment and system integrates a metering solenoid valve at the gas outlet of the gas-liquid separation chamber, which not only separates the gas but also accurately measures the gas flow. By merging the measured gas flow and liquid flow, this system can provide the total flow and gas volume fraction (gas content) in the inlet pipeline in real time, upgrading the equipment from a single-phase flow meter to a high-performance two-phase flow analysis system.

[0025] 3. This oil pump flow detection equipment and system, through a dual-mode measurement mechanism of "theoretical flow (encoder method) + actual flow (vibration cross-correlation method)," enables the processing unit to calculate the internal leakage of the flow meter body in real time and accurately. This leakage is the most direct and core health indicator characterizing the internal mechanical wear of the pump body. Through trend analysis of this indicator, the system can accurately diagnose the wear status of the equipment and predict its remaining life, helping users to shift from passive maintenance to predictive maintenance.

[0026] 4. This oil pump flow detection equipment and system highly integrates four major functions—gas-liquid separation, pumping, dual-mode flow metering, and status diagnosis—into a compact unit. The "plug-and-play" design greatly simplifies the user's installation, wiring, and debugging work, reduces potential system failure points, and significantly lowers the overall cost compared to purchasing and integrating multiple independent devices. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the complete structure of the present invention;

[0028] Figure 2 This is a schematic diagram of the gas-liquid separation chamber structure of the present invention;

[0029] Figure 3 This is a schematic diagram of the ultrasonic device structure of the present invention;

[0030] Figure 4 This is a schematic diagram of the main structure of the flow meter of the present invention;

[0031] Figure 5 This is a schematic diagram of the air duct structure of the present invention;

[0032] Figure 6 This is a schematic diagram showing the installation positions of the driving gear and the driven gear of the present invention;

[0033] Figure 7 This is a schematic diagram of the tension adjusting bolt structure of the present invention;

[0034] Figure 8 This is a schematic diagram of the vibration detection tube structure of the present invention.

[0035] In the diagram: 1. Flow meter body; 2. Gas-liquid separation chamber; 3. Vibration detection tube;

[0036] 101. Pump housing; 102. Bottom cover; 103. Liquid inlet; 104. Liquid outlet; 105. Drive gear; 106. Driven gear; 107. Top cover; 108. Sensor housing; 109. Miniature absolute encoder; 110. Sensor circuit board; 111. Display screen; 112. Shaft hole; 113. Push rod adjusting screw hole; 114. Fixing hole; 115. Tension adjusting hole; 116. Lever frame; 117. Lever arm; 118. Push rod slide groove; 119. Diaphragm connecting arm; 120. Air guide tube; 121. Stop push rod; 122. Push rod adjusting bolt; 123. Hydrophobic diaphragm; 124. Tension spring; 125. Spring hook; 126. Tension adjusting bolt;

[0037] 201. Tank body; 202. Tangential inlet pipe; 203. Inlet guide section; 204. Ultrasonic equipment; 205. Metering solenoid valve; 206. Gas exhaust port; 207. Wire mesh demister; 208. Baffle plate;

[0038] 301. Outlet pipe; 302. Sensor mounting bracket; 303. Vibration sensor; 304. Connecting bracket. Detailed Implementation

[0039] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] Please see Figures 1-8 An oil pump flow detection device includes a flow meter body 1, with a gas-liquid separation chamber 2 connected to the input end of the flow meter body 1, and a vibration detection tube 3 connected to the output end of the flow meter body 1.

[0041] In a preferred embodiment: the flow meter body 1 includes a pump housing 101, a bottom cover 102 is fixedly mounted on the bottom of the pump housing 101, a top cover 107 is fixedly mounted on the top of the pump housing 101, one end of the pump housing 101 is connected to a liquid inlet 103, the other end of the pump housing 101 is connected to a liquid outlet 104, and a drive gear 105 and a driven gear 106 are rotatably connected to the inner wall of the pump housing 101.

[0042] In a preferred embodiment: a sensor housing 108 is fixedly mounted on the top of the drive gear 105, a miniature absolute encoder 109 is fixedly mounted on the top of the drive gear 105, a sensor circuit board 110 is fixedly mounted on the inner wall of the sensor housing 108, a display screen 111 is fixedly mounted on the top inner wall of the sensor housing 108, a shaft hole 112 is opened on the top of the drive gear 105, a push rod adjusting screw hole 113 is opened on the top of the driven gear 106, a fixing hole 114 and a tension adjusting hole 115 are also opened on the top of the top of the drive gear 106, a lever frame 116 is fixedly mounted on the top of the driven gear 106, one end of a lever arm 117 is rotatably connected to the outer wall of the lever frame 116, a push rod groove 118 is opened in the middle of the lever arm 117, and the lever arm 117... A diaphragm connecting arm 119 is rotatably connected to the other end of lever arm 117. A hydrophobic diaphragm 123 is fixedly mounted on the outer wall of the end of diaphragm connecting arm 119 away from lever arm 117. The outer wall of hydrophobic diaphragm 123 is sleeved on air guide tube 120. Air guide tube 120 is fixedly mounted on the inner wall of fixed hole 114. One end of stop rod 121 is slidably sleeved on the inner wall of push rod groove 118. The outer wall of stop rod 121 is sleeved on push rod adjusting bolt 122. Push rod adjusting bolt 122 is threadedly connected to the inner wall of push rod adjusting screw hole 113. One end of tension spring 124 is rotatably connected to the middle of lever arm 117, which is located between diaphragm connecting arm 119 and push rod groove 118. A spring hook 125 is fixedly mounted on the other end of tension spring 124. A tension adjusting bolt 126 is rotatably connected to the bottom of spring hook 125. The end of tension adjusting bolt 126 is threadedly connected to the inner wall of tension adjusting hole 115.

[0043] In a preferred embodiment: the driving gear 105 and the driven gear 106 mesh with each other, the top of the driving gear 105 is rotatably connected to the inner wall of the shaft hole 112, the bottom of the stop rod 121 abuts against the top of the driven gear 106, the end of the air guide tube 120 away from the diaphragm connecting arm 119 is located in the cavity of the driving gear 105 and the driven gear 106 near the liquid inlet 103, the pump housing 101, the bottom cover 102, and the top cover 107 are fixedly assembled by bolts, the miniature absolute encoder 109 and the display screen 111 are electrically connected to the sensor circuit board 110, and the push rod groove 118 is slidably sleeved on the inner wall of the stop rod 121.

[0044] In the above structure, the tension adjustment bolt 126 and the tension adjustment hole 115 are connected by a threaded connection on the inner wall. By rotating the tension adjustment bolt 126, the tension applied by the tension spring 124 to the lever arm 117 can be adjusted. The lever arm 117 is rotatably connected to the top cover 107 via the lever frame 116, and is slidably sleeved on the inner wall of the top rod groove 118 via the stop rod 121. The diaphragm connecting arm 119, which is rotatably connected to the end of the lever arm 117, is slidably sleeved on the inner wall of the air guide tube 120. The end of the air guide tube 120 is located in the cavity near the liquid inlet 103 of the driving gear 105 and the driven gear 106. This allows the gas to pass through the air guide tube 120 when the liquid and air enter the cavity near the liquid inlet 103 of the driving gear 105 and the driven gear 106 through the liquid inlet 103. Guided by the hydrophobic membrane 123, when the liquid reaches the entrance of the micropores on the surface of the hydrophobic membrane 123, the strong surface tension will form a "liquid surface film", which covers the pores like a drum skin. However, gas molecules have no surface tension effect and can freely and easily pass through these pores, thereby realizing the gas discharge through the hydrophobic membrane 123 fixedly mounted on the outer wall of the membrane connecting arm 119. When the liquid is blocked by the hydrophobic membrane 123, and at the same time when the liquid exerts an upward thrust on the hydrophobic membrane 123, the hydrophobic membrane 123 drives the lever arm 117 to rotate through the lever frame 116 via the membrane connecting arm 119, so that the lever arm 117 drives the stop rod 121 to move upward through the push rod slide groove 118, thereby canceling the contact between the end of the stop rod 121 and the driven gear 106.

[0045] When the stop rod 121 does not engage with the driven gear 106, the resistance of the driven gear 106 rotating between the top cover 107 and the bottom cover 102 is reduced. Therefore, the liquid can normally drive the drive gear 105 and the driven gear 106 to rotate, so that the liquid can normally pass through the flow meter body 1 and be discharged from the liquid outlet 104.

[0046] The pressure of the oil drives the drive gear 105 and driven gear 106 to rotate, "squeezing" the liquid from the liquid inlet 103 to the liquid outlet 104. The volume of oil discharged from the space formed between the drive gear 105 and driven gear 106 and the sensor circuit board 110 is constant for each rotation of the drive gear 105 and driven gear 106.

[0047] The number of mechanical rotations is converted into electrical pulse signals by a miniature absolute encoder 109 mounted on top of the top cover 107. The flow rate Q is proportional to the pulse frequency f, thus enabling the detection of the oil pump flow rate.

[0048] By designing the gas discharge structure of the vent pipe 120, when the equipment is in its initial or final operation, if the liquid contains gas, the gas can be discharged through the vent pipe 120. This makes the volume of pure oil in the space between the drive gear 105 and the driven gear 106 and the sensor circuit board 110 more accurate, thus avoiding the problem of inaccurate oil pump flow detection caused by the mixture of oil and gas filling the space between the drive gear 105 and the driven gear 106 and the sensor circuit board 110.

[0049] After the oil pump output pressure changes, the tension applied by the tension spring 124 to the lever arm 117 can be adjusted by rotating the tension adjusting bolt 126, so that the threshold of the liquid pushing the hydrophobic diaphragm 123 can be changed.

[0050] Tightening the tension adjusting bolt 126 clockwise will stretch the tension spring 124, increasing the downward force it generates.

[0051] Loosening the tension adjusting bolt 126 counterclockwise will loosen the tension spring 124, reducing the downward force it generates.

[0052] When the "downward force" increases, a stronger liquid thrust is required to start the equipment, which means the starting threshold is increased, making it suitable for high-pressure working environments.

[0053] When the "downward force" decreases, only a weaker liquid thrust is needed to start the equipment, meaning the starting threshold is lowered, making it suitable for low-pressure working environments.

[0054] The tension of the tension spring 124 can be adjusted by manually rotating a tension adjusting bolt 126, thereby setting the sensitivity of the equipment start-up, so that it will not "falsely start" under high pressure or "not start" under low pressure, thus ensuring the universality and reliability of the equipment in different pressure systems.

[0055] In a preferred embodiment: the gas-liquid separation chamber 2 includes a chamber body 201. A tangential liquid inlet pipe 202 is fixedly installed on the inner wall of the chamber body 201. An inlet guide section 203 is fixedly installed on the inner wall of the tangential liquid inlet pipe 202 near the inner cavity of the chamber body 201. An ultrasonic device 204 is fixedly installed on the inner wall of the inlet guide section 203. A metering solenoid valve 205 communicating with the inner cavity of the chamber body 201 is fixedly installed on the top of the chamber body 201. A gas discharge port 206 is connected to the outlet of the metering solenoid valve 205. A wire mesh demister 207 is fixedly installed on the inner wall of the chamber body 201. Two sets of baffles 208 are fixedly installed on the top of the wire mesh demister 207 and are fixedly installed on the inner wall of the chamber body 201.

[0056] The ultrasonic device 204 added inside the tangential liquid inlet pipe 202 uses the radiation force of sound waves to cause microbubbles to quickly coalesce and separate from the liquid. Combined with the subsequent swirl, wire mesh and baffle structure, it realizes further separation of gas and liquid two-phase flow, solves the problem of inaccurate measurement caused by gas entrainment in the liquid, and ensures the long-term stability and reliability of flow data.

[0057] In a preferred embodiment: the two sets of baffles 208 are designed at 180° to each other, and the wire mesh demister 207 is located at the top of the tangential inlet pipe 202.

[0058] The cross-sectional shape of the baffle 208 is composed of several inclined plates;

[0059] In the above structure, the tangential liquid inlet pipe 202 adopts a tangential design, and the liquid cuts in at high speed along the inner wall of the chamber 201, forming a strong centrifugal vortex. Under the action of centrifugal force, the denser oil will be thrown towards the inner wall of the chamber 201 and flow downward, while the extremely light gas will be gathered in the central area.

[0060] In the upper part of the tangential liquid inlet pipe 202, that is, in the necessary path for the gas to rise, a wire mesh demister 207 made of special metal wire is set. When the airflow carrying tiny droplets passes through, the droplets will adhere to the metal wire due to inertial collision. As the droplets continue to gather and grow, they will eventually fall off due to gravity and return to the liquid phase below, effectively capturing the "mist" carried in the airflow.

[0061] Above the wire mesh demister 207 and before the metering solenoid valve 205, a baffle 208 is set. When the gas passes through the tortuous channel, it will undergo several sudden turns. Even if a very small number of tiny droplets are not captured by the wire mesh demister 207, they will be intercepted by directly hitting the baffle due to inertia.

[0062] Through the above design, the liquid and gas can be separated when the liquid passes through the gas-liquid separation chamber 2. By setting the outlet of the gas-liquid separation chamber 2 at the bottom of the chamber body 201, the purified liquid can be transferred to the flow meter body 1.

[0063] The purified gas after three-stage separation is discharged from the gas outlet 206 at the top of the chamber 201. The metering solenoid valve 205 integrates a gas mass flow meter and a pipeline solenoid valve. The gas mass flow meter measures the discharged gas flow rate Qg in real time, and the pipeline solenoid valve is controlled by the processing unit to discharge gas as needed.

[0064] In a preferred embodiment: the vibration detection tube 3 includes an outlet pipe 301, two sets of sensor mounting seats 302 are fixedly mounted on the outer wall of the end of the outlet pipe 301 away from the flow meter body 1, a vibration sensor 303 is fixedly mounted on the inner wall of the sensor mounting seat 302, and a connecting seat 304 is fixedly mounted on the end of the outlet pipe 301 near the sensor mounting seat 302.

[0065] In the above structure, the precise rotation angle and number of turns of the gear are directly output by the miniature absolute encoder 109, and the actual liquid flow rate reflecting the true state of the fluid is provided by two sets of vibration sensors 303, and the actual liquid flow rate is calculated.

[0066] When the gears of the flowmeter body 1 mesh and rotate, they will generate a unique pressure pulsation and mechanical vibration with stable characteristics. The vibration signal is used as a natural "acoustic fingerprint". The "acoustic fingerprint" will spread downstream with the liquid in the pipe.

[0067] Two vibration sensors 303, one upstream and one downstream, synchronously and at high frequency acquire the vibration waveforms when the "acoustic fingerprint" propagates to their respective positions, and obtain time series signals Vat and Vbt, respectively;

[0068] The processing unit performs a cross-correlation operation on the two signals. The core of this algorithm is to find a time delay Δt such that the waveform of the upstream signal Vat is most similar to that of the downstream signal Vbt-Δt after translation, i.e., the correlation coefficient is the largest. This Δt is the precise time taken for the "acoustic fingerprint" to travel a distance L in the liquid.

[0069] According to the physical formula, the actual average flow velocity of the fluid is v = L / Δt. Multiplying this flow velocity by the cross-sectional area A of the outlet pipe 301 will give a high-precision second liquid flow rate value, namely the actual liquid flow rate Q_actual = vA.

[0070] An oil pump flow detection system: including

[0071] The gas-liquid separation chamber 2 is used to separate the inlet oil-gas mixture into pure liquid and gas, and output a first signal, which is the flow rate value of the separated gas.

[0072] The flow meter body 1 is used to transport pure liquid from the gas-liquid separation chamber 2 and output a second signal, which is the theoretical liquid flow rate value calculated based on the rotational speed of its internal gears.

[0073] Vibration detection tube 3 is connected to the outlet of the flow meter body 1 and is used to output a third signal. The third signal is the actual liquid flow rate value calculated based on the cross-correlation of the signals of the two sets of vibration sensors 303 on its outer wall.

[0074] The processing unit is electrically connected to the gas-liquid separation chamber 2, the flow meter body 1, and the vibration detection tube 3, and is configured to:

[0075] Receive the first, second, and third signals;

[0076] Based on the first and third signals, calculate the total flow rate and gas volume fraction in the incoming pipeline;

[0077] Based on the difference between the second and third signals, the internal leakage of the flow meter body 1 is calculated, and the wear condition of the flow meter body 1 is diagnosed.

[0078] The processing unit performs data fusion and intelligent diagnostics. The processing unit is configured to perform the following operations, and its detailed workflow is as follows:

[0079] Step 1: Synchronous acquisition of multi-source heterogeneous signals

[0080] The processing unit acquires signals from three different modules in parallel at a preset high sampling frequency. These signals differ in their physical properties and the dimensions of information they represent.

[0081] The first signal (gas flow signal) comes from the gas mass flow meter integrated into the metering solenoid valve 205 at the top of the gas-liquid separation chamber 2. This signal directly quantifies the volume or mass flow rate of the gas separated from the original fluid, denoted as Qg.

[0082] The second signal (theoretical flow rate signal) comes from the miniature absolute encoder 109 inside the flow meter body 1. This signal is a pulse or digital signal representing the rotational speed n of the drive gear 105. The processing unit converts it into the theoretical liquid flow rate value according to the preset theoretical pump displacement D (volume discharged per revolution) using the formula Ql_theory=D×n.

[0083] The third signal (vibration timing signal) comes from two vibration sensors 303 located upstream and downstream of the outer wall of the vibration detection tube 3. This signal consists of two complex time-series waveforms, Vat and Vbt, which contain "acoustic fingerprint" information generated by gear meshing and propagating with the liquid.

[0084] Step 2: Calculation of actual liquid flow rate based on cross-correlation

[0085] The processing unit performs core calculations on the third signal. A small segment of the waveform Vat from the upstream sensor is captured and subjected to sliding matching within the waveform data stream Vbt from the downstream sensor. A cross-correlation algorithm is used to find a time delay Δt that maximizes the waveform similarity between Vat and Vbt-Δt. This Δt represents the time it takes for the vibration signal to travel a fixed distance L in the liquid. The processing unit then calculates the actual liquid velocity using the formula v_actual = L / Δt, and multiplies it by the pipe cross-sectional area A to obtain the final actual liquid flow rate Ql_actual. This value most accurately reflects the current operating conditions.

[0086] Step 3: Data Fusion and Full-Phase Analysis

[0087] The processing unit integrates the first signal and the actual liquid flow rate calculated in the second step:

[0088] Calculate the total flow rate: Q_total = Qg + Ql_actual. This value represents the total flow rate of the oil-gas mixture in the original pipeline before entering the gas-liquid separation chamber 2.

[0089] Calculate the gas volume fraction (GVF): GVF = Qg / Q_total. This value reflects the gas content in the original fluid in real time and is an important indicator for judging upstream operating conditions (such as whether the pipeline is leaking).

[0090] Step 4: Quantification of internal leakage and diagnosis of wear condition

[0091] The processing unit compares the theoretical flow rate Ql_theory calculated from the second signal with the actual flow rate Ql_actual calculated in the second step:

[0092] Calculate the internal leakage (slip): Slip = Ql_theory - Ql_actual. This difference precisely quantifies the amount of liquid that flows back due to the gap between the gear and the pump housing 101.

[0093] Diagnosing Wear Condition: When the pump is new, the Slip value is small. With prolonged operation, wear occurs in the gears and pump housing 101, leading to increased clearance and a slow but continuous increase in the Slip value. The processing unit records and analyzes historical Slip value data. Once the growth rate exceeds a preset threshold, it determines that the pump has entered a significant wear stage and outputs predictive maintenance or replacement recommendations.

[0094] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0095] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An oil pump flow detection device, comprising a flow meter body (1), characterized in that: The input end of the flow meter body (1) is connected to the gas-liquid separation chamber (2), and the output end of the flow meter body (1) is connected to the vibration detection tube (3). The flow meter body (1) includes a pump housing (101), a bottom cover (102) is fixedly mounted on the bottom of the pump housing (101), a top cover (107) is fixedly mounted on the top of the pump housing (101), a liquid inlet (103) is connected to one end of the pump housing (101), a liquid outlet (104) is connected to the other end of the pump housing (101), and a drive gear (105) and a driven gear (106) are rotatably connected to the inner wall of the pump housing (101). The top cover (107) is fixedly mounted with a sensor housing (108) at the top position of the drive gear (105). A miniature absolute encoder (109) is fixedly mounted on the top cover (107) at the top position of the drive gear (105). A sensor circuit board (110) is fixedly mounted on the inner wall of the sensor housing (108). A display screen (111) is fixedly mounted on the top inner wall of the sensor housing (108). A shaft hole (11) is opened on the top cover (107) at the top of the drive gear (105). 2) The top cover (107) is provided with a push rod adjusting screw hole (113) on the top of the driven gear (106). The top cover (107) is also provided with a fixing hole (114) and a tension adjusting hole (115). The top cover (107) is fixedly mounted with a lever frame (116) on the top of the driven gear (106). One end of the lever arm (117) is rotatably connected to the outer wall of the lever frame (116). The middle part of the lever arm (117) is provided with a push rod sliding groove (118). The other end is rotatably connected to a diaphragm connecting arm (119). A hydrophobic diaphragm (123) is fixedly mounted on the outer wall of the end of the diaphragm connecting arm (119) away from the lever arm (117). The outer wall of the hydrophobic diaphragm (123) is sleeved on the air guide tube (120). The air guide tube (120) is fixedly mounted on the inner wall of the fixing hole (114). One end of the stop rod (121) is slidably sleeved on the inner wall of the push rod groove (118). The outer wall of the stop rod (121) is sleeved on the push rod adjusting bolt (122). The top rod adjusting bolt (122) is threaded to the inner wall of the top rod adjusting screw hole (113). The lever arm (117) is located in the middle of the diaphragm connecting arm (119) and the top rod slide groove (118) and is rotatably connected to one end of the tension spring (124). The other end of the tension spring (124) is fixedly equipped with a spring hook (125). The bottom of the spring hook (125) is rotatably connected to the tension adjusting bolt (126). The end of the tension adjusting bolt (126) is threaded to the inner wall of the tension adjusting hole (115). The vibration detection tube (3) includes an outlet pipe (301). Two sets of sensor mounting seats (302) are fixedly installed on the outer wall of the end of the outlet pipe (301) away from the flow meter body (1). A vibration sensor (303) is fixedly installed on the inner wall of the sensor mounting seat (302). A connecting seat (304) is fixedly installed on the end of the outlet pipe (301) near the sensor mounting seat (302).

2. The oil pump flow detection device according to claim 1, characterized in that: The driving gear (105) and driven gear (106) mesh with each other. The top of the driving gear (105) is rotatably connected to the inner wall of the shaft hole (112). The bottom of the stop rod (121) abuts against the top of the driven gear (106). The end of the air guide tube (120) away from the diaphragm connecting arm (119) is located in the cavity on the side of the driving gear (105) and driven gear (106) near the liquid inlet (103). The pump housing (101), bottom cover (102), and top cover (107) are fixedly assembled by bolts. The miniature absolute encoder (109) and display screen (111) are electrically connected to the sensor circuit board (110). The push rod groove (118) is slidably sleeved on the inner wall of the stop rod (121).

3. The oil pump flow detection device according to claim 2, characterized in that: The gas-liquid separation chamber (2) includes a chamber body (201). A tangential liquid inlet pipe (202) is fixedly installed on the inner wall of the chamber body (201). An inlet guide section (203) is fixedly installed on the inner wall of the tangential liquid inlet pipe (202) near the inner cavity of the chamber body (201). An ultrasonic device (204) is fixedly installed on the inner wall of the inlet guide section (203). A metering solenoid valve (205) communicating with the inner cavity of the chamber body (201) is fixedly installed on the top of the chamber body (201). A gas discharge port (206) is connected to the outlet of the metering solenoid valve (205). A wire mesh demister (207) is fixedly installed on the inner wall of the chamber body (201). Two sets of baffles (208) are fixedly installed on the top of the wire mesh demister (207) and are fixedly installed on the inner wall of the chamber body (201).

4. The oil pump flow detection device according to claim 3, characterized in that: The two sets of baffles (208) are designed at 180° to each other, and the wire mesh demister (207) is located at the top of the tangential liquid inlet pipe (202).

5. An oil pump flow detection system, characterized in that: include The gas-liquid separation chamber (2) is used to separate the oil-gas mixture at the inlet into pure liquid and gas, and output a first signal, the first signal being the flow rate value of the separated gas. The flow meter body (1) is used to transport pure liquid from the gas-liquid separation chamber (2) and output a second signal, which is the theoretical liquid flow rate value calculated based on the rotational speed of its internal gears; The vibration detection tube (3) is connected to the outlet of the flow meter body (1) and is used to output a third signal, which is the actual liquid flow rate value calculated based on the cross-correlation of the signals of the two sets of vibration sensors (303) on its outer wall. The processing unit is electrically connected to the gas-liquid separation chamber (2), the flow meter body (1), and the vibration detection tube (3), and is configured to: Receive the first, second, and third signals; Based on the first and third signals, calculate the total flow rate and gas volume fraction in the incoming pipeline; Based on the difference between the second signal and the third signal, the internal leakage of the flow meter body (1) is calculated, and the wear condition of the flow meter body (1) is diagnosed.

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