Intelligent separate injection instrument and large-range-ratio differential pressure flow measurement method

Abstract

The invention relates to an intelligent separate injection instrument and a large-range-ratio differential pressure flow measuring method.The intelligent separate injection instrument comprises a shell, an injection main channel and an injection layer channel are arranged in the shell, and the lower end of the injection layer channel is communicated with the lower end of the injection main channel through an outlet channel arranged in the lower end of the shell; a first fixing hole plate is arranged in the injection layer channel, a water nozzle assembly is embedded in the upper end of the injection layer channel and communicated with the injection layer channel, a water outlet is formed in the lower end of the water nozzle assembly, the water nozzle assembly is connected with an opening degree detection assembly, and a second pressure tapping hole is formed in the injection layer channel. The first pressure tapping hole is communicated with a first pressure sensor, the second pressure tapping hole is communicated with a second pressure sensor, the periphery of the shell is provided with a third pressure tapping hole, the third pressure tapping hole is communicated with a third pressure sensor, the injection main channel is provided with a first pressure tapping hole, the first pressure tapping hole is communicated with a first pressure sensor, and the flow measuring range ratio of the dispensing instrument can be expanded under the condition that the structure of the dispensing instrument is not changed.

Description

Technical Field

[0001] The invention belongs to the technical field of intelligent injection in oil fields, and in particular relates to an intelligent injection instrument and a large range ratio differential pressure flow measurement method. Background Art

[0002] Water injection is an effective method to maintain reservoir pressure, achieve high and stable production of oil fields, and improve the development effect of oil fields. 92% of China's oil field reservoirs are continental clastic rock deposits with strong vertical heterogeneity. During the water injection development process, the injected water is easy to channel along the high permeability layer. In order to improve the overall development effect of water-driven oil fields, water injection in medium and low permeability layers should be strengthened. Therefore, developing stratified water injection technology to achieve effective water injection in multiple oil layers is one of the main directions for continuing to improve water drive recovery in oil layers in the late high water cut and ultra-high water cut stages.

[0003] With the further development of intelligent technology, intelligent injection technology has emerged in recent years. It can independently allocate flow to each injection layer in real time, and obtain information of each injection layer online for detection and control, which has greatly improved the digitalization level of oil fields and achieved the goals of efficient water injection, energy conservation and emission reduction, and cost reduction and efficiency improvement.

[0004] Since the dispenser is usually underground, conventional underground flowmeters mostly use mainstream flow measurement methods such as electromagnetic flowmeter, ultrasonic flowmeter, vortex flowmeter, float flowmeter or differential pressure flowmeter. The existing electromagnetic flowmeter and ultrasonic flowmeter have a large range ratio and high measurement accuracy, but the probe is easy to scale and stain, there are many sealing points, the circuit is complex, and the long-term reliability is poor; the vortex flowmeter is easily damaged due to long-term erosion; the float flowmeter has a high range ratio, but it has moving parts, the circuit is more complex, the long-term operation is unstable, and the float is easy to get stuck; the orifice differential pressure flowmeter has the characteristics of small size, simple structure, no moving parts, corrosion resistance, simple circuit, high reliability, can meet the requirements of long-term use of water injection applications, and is currently widely used in dispensers, but its range ratio is generally only 1:5, which cannot meet the application of a wide flow range, and has certain limitations in actual use. Summary of the invention

[0005] In order to solve the above technical problems, the purpose of the present invention is to provide an intelligent dispenser and a large range ratio differential pressure flow measurement method, which, on the basis of maintaining the existing first fixed orifice plate as an orifice differential pressure flowmeter, introduces the water nozzle assembly of the dispenser as an adjustable orifice plate to cooperate with the first fixed orifice plate to realize flow measurement, thereby expanding the flow range ratio of the dispenser.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is as follows: First, the present invention provides an intelligent dispensing instrument, including a shell, wherein a radially spaced injection main channel and an injection layer channel are arranged in the shell, the lower end of the injection layer channel is connected to the lower end of the injection main channel through an outlet channel arranged in the lower end of the shell, and a first fixed orifice plate for liquid throttling is arranged in the injection layer channel; a water nozzle assembly is nested in the upper end of the injection layer channel, and the water nozzle assembly is connected to the injection layer channel; a water outlet is arranged at the lower end of the water nozzle assembly, and an opening detection assembly for detecting the opening size of the water outlet is connected to the water nozzle assembly; a first pressure taking hole is arranged on the injection main channel, and the first pressure taking hole is connected to a first pressure sensor for collecting a first pressure in the injection main channel; a second pressure taking hole is arranged on the injection layer channel, and the second pressure taking hole is connected to a second pressure sensor for collecting a second pressure in the injection layer channel; a third pressure taking hole is arranged on the outer periphery of the shell, and the third pressure taking hole is connected to a third pressure sensor for collecting a third pressure outside the dispensing instrument.

[0007] Furthermore, the injection layer channel is divided by the first fixed orifice plate into an injection layer front channel and an injection layer rear channel that are interconnected, the injection layer front channel is connected to the injection main channel, the water nozzle assembly is arranged at one end of the injection layer rear channel, and the second pressure taking hole is arranged on the injection layer rear channel; the injection layer rear channel is connected to the water nozzle assembly.

[0008] Furthermore, the upper end of the outlet channel is connected to both the main injection channel and the injection layer front channel, and the lower end of the outlet channel passes through the shell.

[0009] Furthermore, the faucet assembly includes a faucet driving mechanism, a faucet valve core and a faucet valve sleeve, the water outlet is arranged on the faucet valve sleeve, the faucet valve sleeve is connected to the rear channel of the injection layer, the faucet valve core is slidably nested in the faucet valve sleeve and connected to the faucet driving mechanism, the faucet driving mechanism drives the faucet valve core to reciprocate in the faucet valve sleeve to adjust the opening size of the water outlet, and the opening detection assembly is movably connected to the faucet driving mechanism.

[0010] Second, the present invention also provides an intelligent dispenser, including a shell, in which a radially spaced main injection channel and an injection layer channel are arranged, the lower end of the injection layer channel is connected to the lower end of the main injection channel via an outlet channel arranged in the lower end of the shell, a water nozzle assembly is nested in the upper end of the injection layer channel, and the water nozzle assembly is connected to the injection layer channel; a water outlet is arranged at the lower end of the water nozzle assembly, and an opening detection assembly for detecting the size of the water outlet opening is connected to the water nozzle assembly, a second pressure taking hole is arranged on the injection layer channel, the second pressure taking hole is connected to a second pressure sensor for collecting a second pressure in the injection layer channel, and a third pressure taking hole is arranged on the outer periphery of the shell, the third pressure taking hole is connected to a third pressure sensor for collecting a third pressure outside the dispenser.

[0011] Furthermore, the upper end of the outlet channel is connected to both the main injection channel and the injection layer channel, and the lower end of the outlet channel passes through the shell.

[0012] Furthermore, the faucet assembly includes a faucet driving mechanism, a faucet valve core and a faucet valve sleeve, the water outlet is arranged on the faucet valve sleeve, the faucet valve sleeve is connected to the injection layer channel, the faucet valve core is slidably nested in the faucet valve sleeve and connected to the faucet driving mechanism, the faucet driving mechanism drives the faucet valve core to reciprocate in the faucet valve sleeve to adjust the opening size of the water outlet, and the opening detection assembly is movably connected to the faucet driving mechanism.

[0013] Third, the present invention also provides a method for measuring a large range ratio differential pressure flow rate of an intelligent dispensing instrument, the method comprising: Respectively obtain first differential pressure data of the inside and outside of the injection main channel and second differential pressure data of the inside and outside of the injection layer channel; the first differential pressure data is the difference between the first pressure and the second pressure, and the second differential pressure data is the difference between the second pressure and the third pressure; Obtaining an equivalent area of ​​a water outlet; the equivalent area is obtained by looking up a table according to the opening of the water outlet; The magnitude of the first differential pressure data and a preset target pressure difference threshold is determined. If the first differential pressure data does not exceed the target pressure difference threshold, the flow rate of the liquid outflow is measured by the equivalent area and the second differential pressure data.

[0014] Further, if the first differential pressure data exceeds the target pressure difference threshold, the flow rate of the liquid outflow is measured by the cross-sectional area of ​​the first fixed orifice plate and the first differential pressure data.

[0015] Fourth, the present invention also provides a method for measuring a large range ratio differential pressure flow rate of an intelligent dispensing instrument, the method comprising: Acquire second differential pressure data inside and outside the injection layer channel; the second differential pressure data is the difference between the second pressure and the third pressure; Obtaining an equivalent area of ​​the water outlet, wherein the equivalent area is obtained by looking up a table according to the opening of the water outlet; The outflow rate of the liquid is measured by the equivalent area and the second differential pressure data.

[0016] The present invention adopts the above technical solution, which has the following advantages and effects: The present invention provides an intelligent dispenser and a large range ratio differential pressure flow measurement method, which cleverly uses the water outlet of a faucet assembly as an adjustable orifice plate, and through the cooperation between the adjustable orifice plate and the first fixed orifice plate, and then through the reasonable scheduling of the flow algorithm, the adjustable orifice plate throttling can achieve small flow measurement when the flow is small, and the first fixed orifice plate throttling can achieve large flow measurement when the flow is large, thereby expanding the range ratio of the dispenser using a traditional differential pressure flowmeter. Without changing the internal structure of the dispenser, the flow range ratio of the dispenser is expanded to 1:18, which can meet the measurement application of a wide flow range and does not increase the manufacturing cost of the dispenser. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a structural diagram of Example 1 of the present invention.

[0018] Figure 2 This is a structural diagram of Example 2 of the present invention.

[0019] The figure numbers are as follows: 1- faucet drive mechanism, 2- faucet valve core, 3- injection layer channel, 4- water outlet, 5- second pressure hole, 6- injection layer rear channel, 7- first fixed orifice plate, 8- injection layer front channel, 9- outlet channel, 10- injection main channel, 11- faucet valve sleeve, 12- first pressure hole, 13- shell. DETAILED DESCRIPTION

[0020] The embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings so that the purpose, features and advantages of the present invention can be more clearly understood. It should be understood that the embodiments shown in the accompanying drawings are not intended to limit the scope of the present invention, but are only intended to illustrate the essential spirit of the technical solution of the present invention. Example

[0021] like Figure 1As shown. An intelligent dispensing instrument of Example 1 includes a shell 13, in which a radially spaced main injection channel 10 and an injection layer channel 3 are arranged. The lower end of the injection layer channel 3 is connected to the lower end of the main injection channel 10 through an outlet channel 9 arranged in the lower end of the shell 13, and the upper end of the main injection channel 10 is connected to the upper end of the shell 13. A first fixed orifice plate 7 for liquid throttling is arranged in the injection layer channel 3. A water nozzle assembly is nested in the upper end of the injection layer channel 3, and a water outlet 4 is arranged on the side of the lower end of the water nozzle assembly close to the outer periphery of the shell 13. The water nozzle assembly is used to control the opening size of the water outlet 4, and an opening detection assembly for detecting the opening size of the water outlet 4 is connected to the water nozzle assembly. The injection layer channel 3 is connected to the water nozzle assembly, and a first pressure hole 12 penetrating the inner and outer peripheries of the main injection channel 10 is arranged radially. The first pressure hole 12 is connected to a first pressure sensor for collecting the first pressure in the main injection channel 10. The injection layer channel 3 is radially provided with a second pressure-taking hole 5 penetrating the inner and outer peripheries thereof, and the second pressure-taking hole 5 is connected to a second pressure sensor for collecting the second pressure in the injection layer channel 3. The outer periphery of the housing 13 is radially provided with a third pressure-taking hole penetrating the inner and outer peripheries thereof, and the third pressure-taking hole is connected to a third pressure sensor for collecting the third pressure outside the dispenser.

[0022] Specifically, a water injection hole is provided on one side of the outer circumference of the shell 13 and is connected to the water outlet 4. The two ends of the injection main channel 10 are respectively connected to the two ends of the shell 13. After the injected liquid passes through the injection main channel 10, a part of the liquid flows out of the dispenser from the outlet channel 9 at the lower end of the shell 13 and enters the lower pipe column. The other part of the liquid passes through the first fixed orifice plate 7 in the injection layer channel 3 from the injection main channel 10 and enters the water nozzle assembly, and then flows out from the water outlet 4 of the water nozzle assembly through the water injection hole and is injected into the target formation. The water nozzle assembly controls the flow rate injected into the target formation by controlling the opening size of the water outlet 4.

[0023] Furthermore, the first fixed orifice plate 7 is located in the injection layer channel 3 near one end of the injection main channel 10, dividing the injection layer channel 3 into an injection layer front channel 8 and an injection layer rear channel 6. A through hole is provided on the first fixed orifice plate 7 to connect the injection layer front channel 8 and the injection layer rear channel 6. The lower end of the injection layer front channel 8 is connected to the lower end of the injection main channel 10. The faucet assembly is arranged in the upper end part of the injection layer rear channel 6. The injection layer rear channel 6 is connected to the faucet assembly. The second pressure taking hole 5 is arranged in the radial direction of the injection layer rear channel 6 and runs through its inner and outer circumference.

[0024] Furthermore, the upper end of the outlet channel 9 is connected to both the main injection channel 10 and the injection layer front channel 8 , and the lower end of the outlet channel 9 axially penetrates the shell 13 .

[0025] Specifically, the outlet channel 9 is axially arranged at the axis center of the lower end of the shell 13, and the lower end of the injection main channel 10 and the lower end of the injection layer front channel 8 are connected through the upper end of the outlet channel 9. A part of the injected liquid flows out of the shell 13 from the lower end of the outlet channel 9 after being injected into the main channel 10.

[0026] Further, the faucet assembly includes a faucet driving mechanism 1, a faucet valve core 2 and a faucet valve sleeve 11, the water outlet 4 is arranged on the faucet valve sleeve 11, the faucet valve sleeve 11 is communicated with the injection layer rear channel 6, the faucet valve core 2 is slidably nested in the faucet valve sleeve 11 and connected to the faucet driving mechanism 1, and the faucet driving mechanism 1 drives the faucet valve core 2 to reciprocate in the faucet valve sleeve 11 to adjust the opening size of the water outlet 4. The opening detection component is movably connected to the faucet driving mechanism 1.

[0027] Specifically, the faucet valve sleeve 11 is arranged at the upper end of the injection layer rear channel 6 and is connected to the injection layer rear channel 6. The faucet valve core 2 is installed in the faucet valve sleeve 11. The faucet valve core 2 is rigidly connected to the faucet driving mechanism 1. The faucet valve core 2 is driven by the faucet driving mechanism 1 to reciprocate in the faucet valve sleeve 11 to adjust the opening size of the water outlet 4, thereby forming an adjustable orifice plate.

[0028] Furthermore, the faucet drive mechanism 1 includes a motor and a screw nut assembly, the output end of the motor is connected to the screw nut assembly, one end of the screw nut assembly is connected to the faucet valve core 2, and the motor drives the screw nut assembly to drive the faucet valve core 2 to perform linear reciprocating motion in the faucet valve sleeve 11.

[0029] Furthermore, the opening detection component is movably connected to the lead screw nut component to move to detect the opening size of the water outlet 4. The opening detection component detects the opening size of the water outlet 4 by detecting the displacement of the faucet valve core 2. The opening detection component is a magnetic steel Hall sensor or an LVDT (Linear Variable Differential Transformer) displacement sensor.

[0030] Embodiment 1 also provides a method for measuring a large range ratio differential pressure flow rate of an intelligent dispensing instrument, the method comprising the following steps: Step 1) After the dispenser is powered on and started, read the configuration parameters of the dispenser.

[0031] Step 2), the acquisition module of the dispenser is initialized, and the target pressure difference threshold is preset in the acquisition module.

[0032] Step 3), the acquisition module respectively acquires the first differential pressure data inside and outside the injection main channel 10 and the second differential pressure data inside and outside the injection layer channel 3; the first differential pressure data is the difference between the first pressure in the injection main channel 10 and the second pressure in the injection layer channel 3, that is, the first pressure minus the second pressure; the second differential pressure data is the difference between the second pressure in the injection layer channel 3 and the third pressure outside the dispenser, that is, the second pressure minus the third pressure.

[0033] Step 4), the acquisition module obtains the equivalent area of ​​the liquid flowing through the water outlet 4, and the equivalent area of ​​the water outlet 4 is obtained by obtaining the opening of the water outlet 4 and then looking up the table.

[0034] Specifically, in order to obtain the equivalent area of ​​the water outlet 4, the opening detection component transmits the detected opening to the acquisition module, and the acquisition module obtains the equivalent area of ​​the water outlet 4 according to the opening table lookup in the program.

[0035] Step 5), the acquisition module determines the magnitude of the first differential pressure data and the target pressure difference threshold; If the first differential pressure data exceeds the target pressure difference threshold, the dispenser measures the flow rate of the liquid out of the water outlet 4 through the cross-sectional area of ​​the first fixed orifice plate and the first differential pressure data; If the first differential pressure data does not exceed the target pressure difference threshold, the dispenser measures the flow rate of the liquid out of the water outlet 4 through the equivalent area of ​​the water outlet 4 and the second differential pressure data.

[0036] When the dispenser measures the flow rate, the cross-sectional area of ​​the first fixed orifice plate 7 and the first differential pressure data or the equivalent area of ​​the water outlet 4 and the second differential pressure data are substituted into the flow metering formula for calculation. The flow metering formula is: ; in, is the first differential pressure data or the second differential pressure data (Pa); A is the cross-sectional area of ​​the first fixed orifice plate (m 2 ) or the equivalent area of ​​the outlet; ρ is the density of the liquid (kg / m 3 ); C d is the flow coefficient; q v is the flow rate (m 3 / s).

[0037] The large-range ratio differential pressure flow measurement method of the intelligent dispenser of Example 1 measures the flow by using an adjustable orifice formed by three pressure sensors, a first fixed orifice 7 and an adjustable water outlet 4. Compared with a dispenser using a traditional orifice differential pressure flowmeter, its flow measurement range is expanded from 60~360m³ / d to 20~360m³ / d. Example

[0038] like Figure 2 As shown. An intelligent dispensing instrument of Example 2 includes a shell 13, in which a radially spaced main injection channel 10 and an injection layer channel 3 are arranged. The lower end of the injection layer channel 3 is connected to the lower end of the main injection channel 10 through an outlet channel 9 arranged in the lower end of the shell 13, and the upper end of the main injection channel 10 is connected to the upper end of the shell 13. A water nozzle assembly is nested in the upper end of the injection layer channel 3, and a water outlet 4 is arranged on the side of the lower end of the water nozzle assembly close to the outer periphery of the shell 13. The water nozzle assembly is used to control the opening size of the water outlet 4, and the water nozzle assembly is connected to an opening detection assembly for detecting the opening size of the water outlet 4. A second pressure-taking hole 5 that runs through the inside and outside of the injection layer channel 3 is radially arranged, and the second pressure-taking hole 5 is connected to a second pressure sensor for collecting the second pressure in the injection layer channel 3. A third pressure-taking hole that runs through the inner and outer peripheries of the shell 13 is radially arranged on the outer periphery of the shell 13, and the third pressure-taking hole is connected to a third pressure sensor for collecting the third pressure outside the dispensing instrument.

[0039] Specifically, the upper end of the outlet channel 9 is connected to the main injection channel 10 and the injection layer channel 3, and the lower end of the outlet channel 9 axially penetrates the shell 13. The outer circumference of the shell 13 is provided with a water injection hole connected to the water outlet 4.

[0040] After the injection liquid passes through the main injection channel 10, a part of it flows out of the dispenser from the outlet channel 9, and the other part of the injection liquid is injected into the target formation from the injection holes on the outer periphery of the shell 13 after passing through the injection layer channel 3 and the water outlet 4 from the main injection channel 10. The water nozzle assembly can adjust the opening size of the water outlet 4 to control the injection flow rate.

[0041] The faucet assembly of Example 2 has the same structure as that of the faucet assembly of Example 1.

[0042] Embodiment 2 also provides a method for measuring a large range ratio differential pressure flow rate of an intelligent dispensing instrument, the method comprising the following steps: Step 1) After the dispenser is powered on and started, read the configuration parameters of the dispenser.

[0043] Step 2) Initialize the acquisition module of the dispenser.

[0044] Step 3), the acquisition module acquires the second differential pressure data inside and outside the injection layer channel 3; the second differential pressure data is the difference between the second pressure inside the injection layer channel 3 and the third pressure outside the dispenser, that is, the second pressure minus the third pressure.

[0045] In step 4, the acquisition module obtains the equivalent area of ​​the liquid flowing through the water outlet 4; the equivalent area of ​​the water outlet 4 is obtained by obtaining the opening of the water outlet 4 and then looking up the table, and the acquisition method is the same as that of Example 1.

[0046] Step 5), the dispenser measures the flow rate of the liquid out of the water outlet 4 by using the equivalent area of ​​the liquid flowing through the water outlet 4 and the second differential pressure data. During measurement, the equivalent area of ​​the water outlet and the second differential pressure data are substituted into the flow metering formula for calculation. The flow metering formula is the same as that of Example 1.

[0047] The large-range ratio differential pressure flow measurement method of the intelligent dispenser of Example 2 uses two pressure sensors and an adjustable orifice plate to perform flow measurement. Compared with the dispenser using the traditional orifice differential pressure flowmeter, Example 2 further saves the first fixed orifice plate and the first pressure sensor, and reduces the processing of the first pressure taking hole, further reducing the manufacturing cost and difficulty of the dispenser, which is conducive to mass production.

Claims

1. An intelligent dispensing instrument, characterized in that: The invention comprises a shell (13), wherein a radially spaced main injection channel (10) and an injection layer channel (3) are arranged in the shell (13), wherein the lower end of the injection layer channel (3) is connected to the lower end of the main injection channel (10) via an outlet channel (9) arranged in the lower end of the shell (13), and wherein a first fixed orifice plate (7) for throttling liquid is arranged in the injection layer channel (3); a water nozzle assembly is nested in the upper end of the injection layer channel (3), and the water nozzle assembly is connected to the injection layer channel (3); a water outlet (4) is arranged at the lower end of the water nozzle assembly, and a An opening detection component for detecting the opening size of the water outlet (4); a first pressure-taking hole (12) is provided on the main injection channel (10), and the first pressure-taking hole (12) is connected to a first pressure sensor for collecting a first pressure in the main injection channel (10); a second pressure-taking hole (5) is provided on the injection layer channel (3), and the second pressure-taking hole (5) is connected to a second pressure sensor for collecting a second pressure in the injection layer channel (3); a third pressure-taking hole is provided on the outer periphery of the shell (13), and the third pressure-taking hole is connected to a third pressure sensor for collecting a third pressure outside the dispenser.

2. The intelligent dispensing instrument according to claim 1, characterized in that: The injection layer channel (3) is divided by the first fixed orifice plate (7) into an injection layer front channel (8) and an injection layer rear channel (6) which are interconnected, the injection layer front channel (8) being connected to the injection main channel (10), and the water nozzle assembly being arranged at one end of the injection layer rear channel (6); the second pressure taking hole (5) is arranged on the injection layer rear channel (6), and the injection layer rear channel (6) is connected to the water nozzle assembly.

3. The intelligent dispensing instrument according to claim 2, characterized in that: The upper end of the outlet channel (9) is connected to both the main injection channel (10) and the injection layer front channel (8), and the lower end of the outlet channel (9) passes through the shell (13).

4. The intelligent dispensing instrument according to claim 2 or 3, characterized in that: The faucet assembly comprises a faucet drive mechanism (1), a faucet valve core (2) and a faucet valve sleeve (11); the water outlet (4) is arranged on the faucet valve sleeve (11); the faucet valve core (2) is slidably nested in the faucet valve sleeve (11) and connected to the faucet drive mechanism (1); the faucet drive mechanism (1) drives the faucet valve core (2) to reciprocate in the faucet valve sleeve (11) to adjust the opening of the water outlet (4); the opening detection component is movably connected to the faucet drive mechanism (1); and the faucet valve sleeve (11) is connected to the injection layer rear channel (6).

5. An intelligent dispensing instrument, characterized in that: The invention comprises a shell (13), wherein a radially spaced main injection channel (10) and an injection layer channel (3) are arranged in the shell (13), the lower end of the injection layer channel (3) is connected to the lower end of the main injection channel (10) via an outlet channel (9) arranged in the lower end of the shell (13), a water nozzle assembly is nested in the upper end of the injection layer channel (3), the water nozzle assembly is connected to the injection layer channel (3), a water outlet (4) is arranged at the lower end of the water nozzle assembly, and an opening detection assembly for detecting the opening size of the water outlet (4) is connected to the water nozzle assembly; a second pressure taking hole (5) is arranged in the injection layer channel (3), the second pressure taking hole (5) is connected to a second pressure sensor for collecting a second pressure in the injection layer channel (3), and a third pressure taking hole is arranged on the outer periphery of the shell (13), the third pressure taking hole is connected to a third pressure sensor for collecting a third pressure outside the dispenser.

6. The intelligent dispensing instrument according to claim 5, characterized in that: The upper end of the outlet channel (9) is connected to both the main injection channel (10) and the injection layer channel (3), and the lower end of the outlet channel (9) passes through the shell (13).

7. The intelligent dispensing instrument according to claim 5 or 6, characterized in that: The faucet assembly comprises a faucet drive mechanism (1), a faucet valve core (2) and a faucet valve sleeve (11); the water outlet (4) is arranged on the faucet valve sleeve (11); the faucet valve core (2) is slidably nested in the faucet valve sleeve (11) and connected to the faucet drive mechanism (1); the faucet drive mechanism (1) drives the faucet valve core (2) to reciprocate in the faucet valve sleeve (11) to adjust the opening size of the water outlet (4); the opening detection component is movably connected to the faucet drive mechanism (1); and the faucet valve sleeve (11) is communicated with the injection layer channel (3).

8. A method for measuring a large range ratio differential pressure flow rate of an intelligent dispensing instrument as claimed in any one of claims 1 to 4, characterized in that: The method comprises: Respectively obtaining first differential pressure data inside and outside the injection main channel (10) and second differential pressure data inside and outside the injection layer channel (3); the first differential pressure data is the difference between the first pressure and the second pressure, and the second differential pressure data is the difference between the second pressure and the third pressure; Obtaining an equivalent area of ​​the water outlet (4); the equivalent area is obtained by looking up a table according to the opening of the water outlet (4); The magnitude of the first differential pressure data and a preset target pressure difference threshold is determined. If the first differential pressure data does not exceed the target pressure difference threshold, the flow rate of the liquid outflow is measured by the equivalent area and the second differential pressure data.

9. The large range ratio differential pressure flow measurement method of the intelligent dispensing instrument according to claim 8 is characterized in that: If the first differential pressure data exceeds the target pressure difference threshold, the outflow rate of the liquid is measured by the cross-sectional area of ​​the first fixed orifice plate (7) and the first differential pressure data.

10. A method for measuring a large range ratio differential pressure flow rate of an intelligent dispensing instrument as claimed in any one of claims 5 to 7, characterized in that: The method comprises: Acquiring second differential pressure data inside and outside the injection layer channel (3); the second differential pressure data being the difference between the second pressure and the third pressure; Obtaining an equivalent area of ​​the water outlet (4), wherein the equivalent area is obtained by looking up a table according to the opening of the water outlet (4); The outflow rate of the liquid is measured by the equivalent area and the second differential pressure data.

Images