Flow metering device of electronic metering instrument

Abstract

The utility model discloses a flow metering device of an electronic metering instrument, which comprises a turbine flowmeter body, the inlet end of the turbine flowmeter body is communicated with a liquid conveying pipe, the front end of the liquid conveying pipe is communicated with two liquid inlet pipes, the front ends of the two liquid inlet pipes are both provided with inlets, and the inlets are communicated with the liquid conveying pipe. An outlet is formed in the rear end, away from the liquid inlet pipe, of the liquid conveying pipe, the caliber of the inlet and the caliber of the outlet are gradually enlarged in the opposite directions, a matched filtering mechanism is arranged in the inlet and comprises a shell and a filter element assembly, and the filter element assembly is composed of a primary rough filtering layer, a middle transition layer and a fine filtering layer. Liquid impurities are effectively removed through the synergistic effect of all the filtering layers in the filtering mechanism, the metering accuracy is guaranteed, by means of the special design of the inlet and the outlet and the arrangement of the adjusting mechanism, the flowing speed and the pressure are stable when liquid enters and exits, a good working environment is created for the turbine flowmeter body, and the reliability and the stability of flow metering are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to instrument and meter technical field, especially a kind of electronic metering instrument flow measuring device. BACKGROUND

[0002] In industrial production and many flow measurement scenes, accurate measurement of liquid flow is essential, and the traditional flow measuring device often has deficiencies in the pretreatment of liquid and the stable control of flow.

[0003] Various impurities are often contained in liquid, and if directly entering the flow meter, the impurities can damage the internal precision components of the flow meter, affecting its service life and measurement accuracy. At the same time, the flow rate and pressure stability of the liquid entering the flow meter cannot be guaranteed, and the fluctuation of the flow rate and pressure will interfere with the normal work of the flow meter, resulting in inaccurate measurement and failing to meet the demand of high-precision flow measurement.

[0004] Therefore, we propose an electronic metering instrument flow measuring device. UTILITY MODEL CONTENT

[0005] The main purpose of the utility model is to provide an electronic metering instrument flow measuring device, in order to prevent the impurities in the liquid from damaging the internal precision components of the flow meter, affecting the service life and measurement accuracy, and preventing the liquid flow rate and pressure fluctuation from interfering with the normal work of the flow meter, resulting in inaccurate measurement, thereby improving the accuracy of flow measurement and the reliability and service life of the flow meter, which can effectively solve the problems in the background technology.

[0006] To achieve the above purpose, the technical scheme adopted by the utility model is as follows:

[0007] An electronic metering instrument flow measuring device, comprising a turbine flow meter body, an infusion tube is communicated with the inlet end of the turbine flow meter body, two liquid inlet pipes are communicated with the front end of the infusion tube, an inlet is arranged at the front end of each of the two liquid inlet pipes, an outlet is arranged at the rear end of the infusion tube away from the liquid inlet pipe, the caliber of the inlet and the outlet gradually expands in opposite directions, a matching filter mechanism is arranged in the inlet, the filter mechanism comprises a shell and a filter core assembly, the filter core assembly is composed of a primary coarse filter layer, an intermediate transition layer and a fine filter layer, and an adjusting mechanism is arranged on each of the two liquid inlet pipes and located at the rear end of the filter mechanism.

[0008] By adopting the above technical scheme, the liquid enters from two inlets, and the caliber of the inlet gradually expands. This design can gradually reduce the flow rate of the liquid when it enters the liquid inlet pipe. According to Bernoulli's principle, when the pipe cross-sectional area increases, the flow rate of the liquid decreases and the pressure increases. This is conducive to the liquid entering the device more smoothly and reducing the impact on the internal structure of the device.

[0009] When the liquid enters the inlet, it will first pass through the filtering mechanism, the shell in the filtering mechanism plays a role in protecting and fixing the filter core assembly, the filter core assembly is composed of a primary coarse filter layer, an intermediate transition layer and a fine filter layer. The primary coarse filter layer can filter out larger impurity particles in the liquid, such as sand, larger metal shavings, etc. If these impurities enter the turbine flowmeter body, they may damage the internal turbine and other components of the flowmeter. After passing through the primary coarse filter layer, the liquid enters the intermediate transition layer, which can further intercept some medium-sized impurities and play a role in buffering and uniforming the liquid flow, so that the liquid flows more smoothly to the fine filter layer. The fine filter layer can filter out small impurities such as fine suspended matter, etc., to ensure that the liquid entering the infusion tube has high purity, meeting the requirements of the turbine flowmeter body for liquid purity, thereby ensuring the accuracy of flow measurement.

[0010] The filtered liquid enters the infusion tube through the liquid inlet pipe. An adjusting mechanism is arranged on the two liquid inlet pipes and at the rear end of the filtering mechanism. The adjusting mechanism can adjust the liquid flow from the two liquid inlet pipes into the infusion tube according to actual needs. For example, when it is necessary to accurately control the liquid flow into the turbine flowmeter body, the flow area of the two liquid inlet pipes is changed by the adjusting mechanism, so as to adjust the distribution ratio and total flow of the liquid.

[0011] After the liquid converges in the infusion tube, the liquid flows from the outlet at the rear end of the infusion tube to the turbine flowmeter body. This design can make the liquid enter the turbine flowmeter body more smoothly, because if the liquid enters the turbine flowmeter body too fast or with large pressure fluctuations, it may damage the turbine and other components inside the turbine flowmeter, or affect the accurate measurement of the rotation speed of the turbine, thereby affecting the accuracy of flow measurement. The outlet design can effectively avoid these problems and provide good conditions for the smooth entry of the liquid into the turbine flowmeter body.

[0012] Further, the adjusting mechanism comprises a rotating shaft connected to the top end of the liquid inlet pipe, and the bottom end of the rotating shaft penetrates the inside of the liquid inlet pipe and is fixedly connected with a valve.

[0013] By adopting the above technical scheme, the adjusting mechanism mainly comprises a rotating shaft and a valve. The rotating shaft is rotatably connected to the top end of the liquid inlet pipe, which enables the rotating shaft to rotate freely around the connection point between the rotating shaft and the liquid inlet pipe. The bottom end of the rotating shaft penetrates the inside of the liquid inlet pipe and is fixedly connected with the valve.

[0014] Further, the top end of the liquid inlet pipe is fixedly installed with a motor, and the output end of the motor is fixedly connected with the top end of the rotating shaft.

[0015] By adopting the technical scheme, when the motor rotates, the output shaft of the motor rotates, and since it is fixedly connected with the rotating shaft, the rotating shaft rotates synchronously with the output shaft of the motor. According to the principle of the adjusting mechanism mentioned above, when the motor rotates clockwise, the rotating shaft is driven to rotate clockwise through the output end, and then the valve fixedly connected with the bottom end of the rotating shaft moves towards the direction of closing the passage of the liquid inlet pipe, so that the effective flow area of the liquid inlet pipe is reduced, and the liquid flow is also reduced. When the motor rotates counterclockwise, the rotating shaft also rotates counterclockwise, and the valve moves towards the direction of opening the passage of the liquid inlet pipe, so that the effective flow area of the liquid inlet pipe is increased, and the liquid flow is also increased. By controlling the rotating direction and time of the motor, the opening of the valve can be accurately controlled, so that the automatic adjustment of the liquid flow in the liquid inlet pipe is realized.

[0016] Further, the primary coarse filter layer is a large-aperture metal filter screen.

[0017] By adopting the technical scheme, the primary coarse filter layer is a large-aperture metal filter screen. The metal material makes it have high strength and durability. The design of large aperture is mainly used for intercepting impurity particles of large size in the liquid. When the liquid with impurities enters the filtering mechanism from the inlet, it first contacts the primary coarse filter layer. Since the filter screen has a large aperture, the liquid can pass through relatively smoothly. However, impurity particles with a size larger than the aperture of the filter screen, such as sand particles, large metal chips, plastic fragments, etc., will be intercepted outside the filter screen. According to the principle of particle size screening, only particles smaller than the aperture of the filter screen and the liquid can pass through the primary coarse filter layer and enter the intermediate transition layer. Thus, the large impurities in the liquid that may damage the subsequent components such as the turbine flowmeter body are preliminarily removed, providing a certain guarantee for the subsequent fine filtering and flow measurement.

[0018] Further, the intermediate transition layer is made of loose fiber material.

[0019] By adopting the technical scheme, the intermediate transition layer is made of loose fiber material. The loose structure makes this layer have a large porosity, and there are many small channels and gaps between the fibers. When the liquid passes through the primary coarse filter layer and enters the intermediate transition layer, due to the loose fiber characteristics, the liquid can flow in the channels and gaps between the fibers. On the one hand, it can further intercept some medium-sized impurity particles remaining after passing through the primary coarse filter layer. These impurity particles will be adsorbed by the fibers or stuck in the gaps between the fibers during the liquid flow, preventing them from entering the fine filter layer. On the other hand, the intermediate transition layer plays a role in buffering and uniformizing the liquid flow. The loose fibers can disperse and redistribute the liquid in this layer, avoiding the situation that the liquid flow is too fast locally or the pressure is uneven. After the uniformization treatment of the intermediate transition layer, the liquid can enter the fine filter layer more smoothly, which helps to improve the efficiency of the whole filtering process and the filtering effect of the fine filter layer.

[0020] Further, the fine filter layer is a high-precision microporous membrane.

[0021] By adopting the technical scheme, the intermediate transition layer is composed of loose fiber materials, the loose structure makes the layer have large porosity, and there are many small channels and gaps between the fibers. When the liquid passes through the primary coarse filter layer and enters the intermediate transition layer, due to the loose fiber characteristics, the liquid can flow in the channels and gaps between the fibers. On the one hand, it can further intercept some medium-sized impurity particles remaining after passing through the primary coarse filter layer. These impurity particles will be adsorbed by the fibers or stuck in the gaps between the fibers during the liquid flow process, preventing them from entering the fine filter layer. On the other hand, the intermediate transition layer plays a role in buffering and uniformizing the liquid flow. The loose fibers can make the liquid disperse and redistribute in the layer, avoiding the situation that the liquid has too fast local flow rate or uneven pressure. After the uniformization treatment of the intermediate transition layer, the liquid can enter the fine filter layer more smoothly, which helps to improve the efficiency of the whole filtering process and the filtering effect of the fine filter layer.

[0022] Compared with the prior art, the utility model has the advantages of:

[0023] (1) the filter mechanism of the electronic metering instrument flow metering device can effectively remove different size impurities in the liquid through the synergistic effect of the primary coarse filter layer, the intermediate transition layer and the fine filter layer, ensure that the liquid entering the turbine flow meter body has high purity, reduce the damage of impurities to the turbine and other components in the flow meter, and thus guarantee the accuracy of flow measurement.

[0024] (2) the special design of the inlet and outlet and the setting of the adjusting mechanism make the liquid flow at a stable speed and stable pressure when entering and flowing out of the device. The gradually expanding inlet diameter can reduce the liquid flow rate and increase the pressure, so that the liquid can enter smoothly. The adjusting mechanism can adjust the liquid flow as needed. The design of the outlet avoids the liquid with too fast flow rate or large pressure fluctuation from entering the turbine flow meter body, creates a good working environment for accurate measurement, and improves the reliability and stability of flow measurement. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 Fig. 1 is a structural schematic view of the electronic metering instrument flow metering device of the utility model.

[0026] Figure 2 Fig. 4 is a sectional view of the infusion tube and the liquid inlet tube of the electronic metering instrument flow metering device of the utility model.

[0027] Figure 3The utility model relates to a filter mechanism structure schematic drawing of electronic metering instrument flow metering device.

[0028] In the figure: 1, turbine flowmeter body; 2, infusion pipe; 3, liquid inlet pipe; 4, inlet; 5, outlet; 6, filter mechanism; 7, shell; 8, primary coarse filter layer; 9, intermediate transition layer; 10, fine filter layer; 11, adjusting mechanism; 12, valve; 13, motor. DETAILED DESCRIPTION

[0029] In order to make the technical means, creation features, purposes and effects of the utility model easy to understand, the utility model is further described below in combination with specific embodiments.

[0030] In order to prevent impurities in the liquid from damaging the internal precision components of the flowmeter, affecting the service life and measurement accuracy, and prevent liquid flow rate and pressure fluctuations from interfering with the normal operation of the flowmeter, leading to inaccurate measurement, thereby improving the accuracy of flow measurement and the reliability and service life of the flowmeter, as shown in Figure 1 、 Figure 2 、 Figure 3 An electronic metering instrument flow metering device includes a turbine flowmeter body 1, the inlet end of the turbine flowmeter body 1 is communicated with an infusion pipe 2, the front end of the infusion pipe 2 is communicated with two liquid inlet pipes 3, the front end of the two liquid inlet pipes 3 is provided with an inlet 4, the rear end of the infusion pipe 2 away from the liquid inlet pipe 3 is provided with an outlet 5, the caliber of the inlet 4 and the outlet 5 gradually expands in opposite directions, a matching filter mechanism 6 is arranged in the inlet 4, the filter mechanism 6 includes a shell 7 and a filter core assembly, the filter core assembly is composed of a primary coarse filter layer 8, an intermediate transition layer 9 and a fine filter layer 10, adjusting mechanisms 11 are arranged on the two liquid inlet pipes 3 and located at the rear end of the filter mechanism 6.

[0031] In use, the liquid enters from the two inlets 4, the caliber of the inlet 4 is gradually expanded, this design can make the flow rate of the liquid gradually decrease when entering the liquid inlet pipe 3, according to Bernoulli's principle, when the pipe cross-sectional area increases, the flow rate of the liquid decreases and the pressure increases, which is beneficial to the liquid entering the device more smoothly and reducing the impact on the internal structure of the device;

[0032] When the liquid enters the inlet 4, it will first pass through the filtering mechanism 6, the shell 7 in the filtering mechanism 6 plays a role of protecting and fixing the filter core assembly, the filter core assembly is composed of a primary coarse filter layer 8, an intermediate transition layer 9 and a fine filter layer 10. The primary coarse filter layer 8 can filter out larger impurity particles in the liquid, such as sand, larger metal shavings and the like, if these impurities enter the turbine flowmeter body 1, they may damage the internal turbine and other components of the flowmeter, after passing through the primary coarse filter layer 8, the liquid enters the intermediate transition layer 9, the intermediate transition layer 9 can further intercept some medium-sized impurities and play a role of buffering and uniforming the liquid flow, so that the liquid flows more stably to the fine filter layer 10, and the fine filter layer 10 can filter out small impurities such as fine suspended matters and the like, so as to ensure that the liquid entering the liquid delivery pipe 2 has high purity and meets the requirements of the turbine flowmeter body 1 on the liquid purity, thereby ensuring the accuracy of flow measurement;

[0033] The filtered liquid enters the liquid delivery pipe 2 through the liquid inlet pipe 3, and the adjusting mechanism 11 is arranged on the two liquid inlet pipes 3 and at the rear end of the filtering mechanism 6, the adjusting mechanism 11 can adjust the liquid flow entering the liquid delivery pipe 2 from the two liquid inlet pipes 3 according to actual requirements, for example, when it is required to accurately control the liquid flow entering the turbine flowmeter body 1, the flow area of the two liquid inlet pipes 3 is changed through the adjusting mechanism 11, so as to adjust the distribution ratio and total flow of the liquid;

[0034] After the liquid converges in the liquid delivery pipe 2, the liquid flows from the outlet 5 at the rear end of the liquid delivery pipe 2 to the turbine flowmeter body 1, this design can make the liquid enter the turbine flowmeter body 1 more stably, because if the liquid enters the turbine flowmeter body 1 at too high a flow rate or with too large pressure fluctuation, it may damage the turbine and other components in the turbine flowmeter, or affect the accurate measurement of the rotation speed of the turbine, thereby affecting the accuracy of flow measurement, and the design of the outlet 5 can effectively avoid these problems and provide good conditions for the liquid to enter the turbine flowmeter body 1 stably.

[0035] As shown in the drawings, Figure 2 The adjusting mechanism 11 comprises a rotating shaft connected to the top end of the liquid inlet pipe 3, and the bottom end of the rotating shaft penetrates into the liquid inlet pipe 3 and is fixedly connected with a valve 12.

[0036] In use, the adjusting mechanism 11 is mainly composed of the rotating shaft and the valve 12, the rotating shaft is rotatably connected to the top end of the liquid inlet pipe 3, so that the rotating shaft can rotate freely around the connecting point between the rotating shaft and the liquid inlet pipe 3, and the bottom end of the rotating shaft penetrates into the liquid inlet pipe 3 and is fixedly connected with the valve 12.

[0037] As shown in the drawings, Figure 1 , Figure 2As shown, the utility model also includes, the top fixed installation of liquid inlet pipe 3 13 has motor 13, the output end of motor 13 is fixedly connected with the top of rotating shaft.

[0038] In use, when motor 13 operates, the output shaft of motor 13 rotates, since it and rotating shaft are fixedly connected, so rotating shaft will rotate synchronously with the output shaft of motor 13, according to the principle of adjustment mechanism 11 mentioned above, when motor 13 rotates clockwise, rotating shaft is driven to rotate clockwise through output end, and then makes valve 12 fixedly connected with the bottom of rotating shaft move towards the direction of closing the passage of liquid inlet pipe 3, in this way, the effective flow cross-sectional area of liquid inlet pipe 3 reduces, and liquid flow also reduces, when motor 13 rotates anticlockwise, rotating shaft also rotates anticlockwise, and valve 12 moves towards the direction of opening the passage of liquid inlet pipe 3, the effective flow cross-sectional area of liquid inlet pipe 3 increases, and liquid flow also increases, by controlling the rotating direction and time of motor 13, the opening of valve 12 can be accurately controlled, thereby realizing the automatic adjustment of liquid flow in liquid inlet pipe 3.

[0039] As shown in the example, Figure 2 、 Figure 3 The utility model also includes, the primary rough filter layer 8 is big aperture metal filter screen.

[0040] In use, primary rough filter layer 8 is big aperture metal filter screen, and metal material makes it have higher strength and durability, and the design of big aperture is mainly used for intercepting the impurity particles of relatively large size in liquid, when liquid with impurities enters filter mechanism 6 from inlet 4, first contacts primary rough filter layer 8, since filter screen aperture is relatively large, liquid can pass through relatively smoothly, however, the impurity particles such as sand, larger metal scrap, plastic fragments etc. of size larger than filter screen aperture are intercepted outside filter screen, according to the principle of particle size screening, only the particles and liquid smaller than filter screen aperture can pass through primary rough filter layer 8 and enter intermediate transition layer 9, so that relatively large impurities in liquid that can cause damage to subsequent components such as turbine flowmeter body are preliminarily removed, and certain guarantee is provided for subsequent fine filtering and flow metering work.

[0041] As shown in the example, Figure 2 、 Figure 3 The utility model also includes, intermediate transition layer 9 is loose fiber material.

[0042] In use, the intermediate transition layer 9 is composed of loose fiber material, the loose structure makes this layer have a large porosity, there are many small channels and gaps between the fibers, when the liquid enters the intermediate transition layer 9 after passing through the primary coarse filter layer 8, due to the characteristics of the loose fibers, the liquid can flow in the channels and gaps between the fibers; on the one hand, it can further intercept some medium-sized impurity particles remaining after passing through the primary coarse filter layer 8, these impurity particles will be adsorbed by the fibers or stuck in the gaps between the fibers during the liquid flow process, preventing them from entering the fine filter layer 10; on the other hand, the intermediate transition layer 9 plays a role in buffering and uniformizing the liquid flow, the loose fibers can disperse and redistribute the liquid in this layer, avoiding the situation that the liquid appears too fast locally or the pressure is uneven, after the uniformization treatment of the intermediate transition layer 9, the liquid can enter the fine filter layer 10 more smoothly, which helps to improve the efficiency of the whole filtering process and the filtering effect of the fine filter layer 10.

[0043] As shown in Figure 2 , Figure 3 illustrated, the utility model still includes, fine filter layer 10 is high accuracy micropore membrane.

[0044] In use, the intermediate transition layer 9 is composed of loose fiber material, the loose structure makes this layer have a large porosity, there are many small channels and gaps between the fibers, when the liquid enters the intermediate transition layer 9 after passing through the primary coarse filter layer 8, due to the characteristics of the loose fibers, the liquid can flow in the channels and gaps between the fibers; on the one hand, it can further intercept some medium-sized impurity particles remaining after passing through the primary coarse filter layer 8, these impurity particles will be adsorbed by the fibers or stuck in the gaps between the fibers during the liquid flow process, preventing them from entering the fine filter layer 10; on the other hand, the intermediate transition layer 9 plays a role in buffering and uniformizing the liquid flow, the loose fibers can disperse and redistribute the liquid in this layer, avoiding the situation that the liquid appears too fast locally or the pressure is uneven, after the uniformization treatment of the intermediate transition layer 9, the liquid can enter the fine filter layer 10 more smoothly, which helps to improve the efficiency of the whole filtering process and the filtering effect of the fine filter layer 10.

[0045] It should be noted that the utility model is a kind of electronic metering instrument flow metering device, according to actual flow demand, start motor 13, control motor 13 clockwise rotation.Motor 13's output shaft rotation will drive the fixed connection of synchronous clockwise rotation of the shaft, when the shaft rotates, the valve 12 of its bottom fixed connection will move towards the direction of closing the passage of liquid inlet pipe 3, the effective flow area of liquid inlet pipe 3 is reduced, and then the liquid flow is reduced, the closing degree of valve 12 can be accurately controlled by controlling the length of time of motor 13 rotation, to achieve the desired flow reduction effect;When the flow needs to be increased, start motor 13 and control its counterclockwise rotation, the output shaft of motor 13 drives the counterclockwise rotation of the shaft, and the counterclockwise rotation of the shaft will make the valve 12 move towards the direction of opening the passage of liquid inlet pipe 3, the effective flow area of liquid inlet pipe 3 is increased, and the liquid flow is also increased, and the opening of valve 12 can be accurately controlled by controlling the length of time of motor 13 rotation, to realize the accurate increase regulation of flow;

[0046] Start liquid supply source, make liquid from two inlets 4 into the device, when liquid enters inlet 4, because the caliber of inlet 4 gradually expands, liquid will gradually reduce the flow rate and increase the pressure according to Bernoulli's principle, and enter liquid inlet pipe 3 more smoothly, the liquid entering inlet 4 then enters filter mechanism 6, first passes through primary coarse filter layer 8, the large aperture metal filter screen will intercept larger size impurity particles such as sand, larger metal chips and the like in liquid, only particles smaller than its aperture and liquid can pass through, enter intermediate transition layer 9, in intermediate transition layer 9, loose fiber material utilizes the channel and gap between its fibers, on the one hand, further intercepting medium-sized impurity particles, on the other hand, buffering and uniformizing liquid flow, so that liquid enters fine filter layer 10 more smoothly, liquid enters fine filter layer 10, high-precision microporous membrane will intercept tiny impurities such as fine suspended solids, to ensure that the purity of liquid entering infusion pipe 2 meets the requirements of turbine flowmeter body 1, filtered liquid passes through liquid inlet pipe 3 and enters infusion pipe 2, and then flows from outlet 5 at the rear end of infusion pipe 2 to turbine flowmeter body 1, the design of gradually expanding caliber of outlet 5 ensures that liquid enters turbine flowmeter body 1 smoothly;

[0047] When liquid flows through turbine flowmeter body 1, it pushes the internal turbine to rotate, and the rotation speed is proportional to the liquid flow rate, by detecting the rotation speed of the turbine and using the pre-calibrated relationship, the flow rate of the liquid can be calculated, realizing the flow metering function.

[0048] The basic principle and main features of the present application and the advantages of the present application are shown and described above. Those skilled in the art should understand that the present application is not limited by the above examples, and the above examples and descriptions in the specification are only to illustrate the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. An electronic metering flow metering device comprising a turbine flow meter body (1), characterized in that, The inlet end of the turbine flowmeter body (1) is communicated with a liquid delivery pipe (2), the front end of the liquid delivery pipe (2) is communicated with two liquid inlet pipes (3), the front end of the two liquid inlet pipes (3) is provided with an inlet (4), the rear end of the liquid delivery pipe (2) away from the liquid inlet pipe (3) is provided with an outlet (5), the caliber of the inlet (4) and the outlet (5) gradually expands in opposite directions, a matching filter mechanism (6) is arranged in the inlet (4), the filter mechanism (6) comprises a shell (7) and a filter core assembly, the filter core assembly is composed of a primary coarse filter layer (8), an intermediate transition layer (9) and a fine filter layer (10), the two liquid inlet pipes (3) are provided with adjusting mechanisms (11) on the rear end of the filter mechanism (6).

2. An electronic metering flow metering device according to claim 1, characterized in that: The adjusting mechanism (11) comprises a rotating shaft connected to the top end of the liquid inlet pipe (3), the bottom end of the rotating shaft penetrates into the liquid inlet pipe (3) and is fixedly connected with a valve (12).

3. An electronic metering flow metering device according to claim 1, characterized in that: The top end of the liquid inlet pipe (3) is fixedly installed with a motor (13), the output end of the motor (13) is fixedly connected with the top end of the rotating shaft.

4. An electronic metering flow metering device according to claim 1, characterized in that: The primary coarse filter layer (8) is a large-aperture metal filter screen.

5. An electronic metering flow metering device according to claim 1, characterized in that: The intermediate transition layer (9) is a loose fiber material.

6. An electronic metering flow metering device according to claim 1, characterized in that: The fine filter layer (10) is a high-precision microporous membrane.

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