Intelligent fine flow measurement and control instrument

Abstract

The invention discloses an intelligent fine flow measurement and control instrument which comprises a valve body, a pump gear, a stop valve, a driving part and a control part. The valve body is provided with a metering cavity, two pump gears meshed with each other are arranged in the valve body, each gear is provided with a plurality of continuous teeth attached to the two ends of the metering cavity, and the orthographic projection of the motion trail when the teeth are attached to the inner wall on the metering cavity is a pipeline opening area. The metering cavity is divided into an area a and an area b by the two pump gears, pipelines penetrating through the valve body are arranged in the two pipeline opening areas, and pipe openings are communicated with the bottom of the metering cavity. The cut-off valve is installed on the fluid outflow pipeline and used for cutting off the fluid. The driving part is in transmission connection with one pump gear and drives the pump gear to rotate, fluid flows into the area a, and the other pump gear rotates to enable fluid in the area b to flow out. According to the intelligent fine flow measurement and control instrument, the active controllable flow meter is adopted, configuration can be completed as long as the flow meter is matched with the stop valve, fluid flow can be accurately controlled and measured, and the measurement and control stability of the intelligent fine flow measurement and control instrument is high.

Description

Technical Field

[0001] The present invention belongs to the technical field of flow measurement and control, and specifically relates to an intelligent precise flow measurement and control instrument. Background Art

[0002] At present, the flow measurement and control instruments widely used in the industrial field generally adopt a combined structure of "flow meter + regulating valve", and there are generally two combination methods. The first combination method: in this combined structure, the flow meter is installed in the front for detecting the flow rate, and the regulating valve is installed in the rear. According to the real-time monitoring of the fluid flow rate by the flow meter in the front, the regulating valve is driven to change the opening degree of the regulating valve, adjust the fluid flow rate, and the flow meter and the control valve body need to be separately arranged on the pipeline; The second combination method: an integrated impeller flow measurement and control instrument is adopted. When the impeller fluid flows through the impeller at a certain speed and drives the impeller to rotate, the permanent magnet encapsulated in the impeller also rotates at the same time. Its rotation speed is proportional to the fluid flow rate, and then it is converted into a corresponding electrical signal through a magnetoelectric sensor to realize the display of the instantaneous flow rate and cumulative flow rate of the fluid and the flow rate data, and then drive the opening degree of the regulating valve to change to adjust the fluid flow rate.

[0003] However, both of the above two existing technologies first measure the fluid flow rate and then drive the regulating valve to adjust the fluid flow rate. The following problems will occur during the frequent adjustment actions of the regulating valve: (1) It causes the fluid to change frequently and cannot be precisely controlled: The traditional regulating valve adopts a linear mapping relationship between the valve core displacement and the fluid flow area. However, the actual fluid dynamics characteristics show that there is a significant non-linearity between the valve opening and the flow rate (especially in the small and medium opening ranges). For example, when the opening degree of the regulating valve increases from 20% to 30%, the flow rate change rate may reach 15%, while when it increases from 70% to 80%, the change rate may be only 5%, resulting in inability to precisely control; (2) The frequent actions of the regulating valve lead to a high damage rate of the regulating valve: When the number of operating times of the regulating valve increases, the wear amount of the sealing surface between the valve core and the valve seat will also increase, resulting in an exponential increase in the leakage amount. Existing cases show that the leakage rate of the regulating valve of the flow measurement and control instrument may increase from the initial 0.5% to more than 5% after 18 months of use; (3) The leakage amount of the regulating valve is relatively large and it cannot effectively cut off the fluid, and there is a certain control risk. When driving the regulating valve to adjust the action again, any driving action will cause the fluid flow rate passing through the regulating valve to increase rapidly, and the fluid flow rate passing through cannot be precisely controlled.

[0004] In addition, existing flow measurement and control instruments first detect the existing fluid flow in the pipeline, and then adjust the desired fluid flow through the regulating valve based on the existing fluid flow. This is passive regulation. During passive regulation, the fluid flow requires a higher pressure in the pipeline to proceed. Therefore, once the pressure is low or unstable, the fluid flow will be unstable, the regulating valve needs to move continuously, and the flow control accuracy will be very poor. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention aims to provide an intelligent and precise flow measurement and control instrument.

[0006] To achieve the aforementioned object of the invention, the technical solutions adopted by the present invention include: An intelligent precise flow measurement and control instrument, comprising: a valve body, wherein the valve body is provided with a metering cavity; Two pump gears, the two pump gears meshing with each other and both disposed within the metering chamber; any of the pump gears having a plurality of teeth simultaneously engaging with both ends of the metering chamber, the plurality of teeth being continuous teeth arranged radially along the pump gear; the orthographic projection of the motion trajectory of the teeth when engaging with the inner wall of the metering chamber forming a pipe opening region on the metering chamber; the plurality of teeth of the two pump gears engaging with the metering chamber, dividing the interior of the metering chamber into region a and region b; both pipe opening regions are provided with pipes respectively penetrating the valve body, the pipe openings of the two pipes being connected to the bottom of the metering chamber; A shut-off valve is installed on the pipe where the fluid flows out to cut off the flow of the fluid; A driving component, wherein the driving component is connected to any one of the pump gears and drives the pump gear to rotate. When the pump gear rotates, the fluid in the corresponding pipe outlet area is driven to flow into area a. Then, when the other pump gear rotates, the fluid in area b is driven to flow to the corresponding pipe outlet area. The control component is in communication with the driving component, and is used to control the rotational speed of the driving component to drive the corresponding pump gear. Different rotational speeds result in different fluid flow rates.

[0007] In the present invention, by setting two pump gears, the fluid first flows into one of the pump gears, then flows to the other pump gear in a curved manner, and finally flows out. The two pump gears cut the fluid in an orderly manner, and finely divide the fluid flowing into the metering chamber. According to the flow requirements, the rotation speed of the pump gears is adjusted, and the flow rate is finally adjusted. The traditional passive flow collection is transformed into active control of flow outflow, reducing the influence of the passive use of flow meters to measure flow and the fluctuation of the detected data caused by frequent adjustment of the regulating valve on the measurement and control accuracy, thereby ensuring the measurement and control accuracy. In the present invention, since the flow rate is generated by driving the pump gear member to rotate through the driving member, which is an active flow control method, there is no need for a high pressure in the pipeline. It can operate in a gravity-flow pipeline and has a wide range of application scenarios.

[0008] Further, the metering chamber includes two semi-circular segments and a straight segment. The two semi-circular segments are respectively arranged at both ends of the straight segment. The two pump gears are respectively concentric with one of the semi-circular segments, and the diameters of the two pump gears and the two semi-circular segments are the same. The running track of the semi-circular segment during the rotation of the pump gear is the pipeline orifice area. When the metering chamber includes two semi-circular segments and a straight segment, the fluid volumes in regions a and b are relatively small.

[0009] Further, arc segments are provided at both ends of the metering chamber. The radius of any one arc segment is the same as the radius of the pump gear. The two pump gears are respectively in contact with one of the arc segments. The arc segment is the running track of the pump gear rotation, that is, the pipeline orifice area. When the metering chamber includes arc segments, the other regions can be set larger. At this time, the fluid volumes in regions a and b are relatively large.

[0010] Further, for one of the pipelines, along the rotation direction of the corresponding pump gear, the pipe orifice of the pipeline is located at the front end or the rear end of the corresponding pipeline orifice area, or for one of the pipelines, along the rotation direction of the corresponding pump gear, the pipe orifice of the pipeline is located at the middle end of the corresponding pipeline orifice area. The pipe orifice of the pipeline located at the front end, the rear end or the middle end of the pipeline orifice area can all cut and transport the fluid. However, when the pipe orifice of the pipeline is located at the middle end, compared with the front end or the rear end, the energy consumption and resistance of the driving member during operation are the smallest.

[0011] Further, when the two pump gears are fully meshed, there is a meshing gap. Existing gears all have backlash, that is, a meshing gap is generated for transporting liquids. This backlash can be further adjusted as needed to meet the requirements of different scenarios.

[0012] Further, the fluid in the metering chamber flows out from one of the pipelines. The diameter of the pipeline is smaller than the diameter of the other pipeline. The diameter of the pipeline through which the fluid flows out of the valve body is 1% smaller or 1 mm smaller than the diameter of the pipe orifice through which the fluid flows in. The outflow speed is slow to facilitate the storage of liquid in the metering chamber.

[0013] Further, the number of teeth of the two pump gears is 12 - 22. Of course, the number of teeth can also be set according to the needs of refined scenarios. Generally, when the number of teeth of the pump gear is 12 - 22, the machining accuracy, meshing performance, strength, durability, etc. are all the best.

[0014] Furthermore, it also includes an operating frequency comparison component, which includes a magnet and a magnetoresistor. The magnet is installed on the gear shaft of the pump gear that is transmission-connected to the drive component, and the magnetoresistor is installed on the valve body. The magnetoresistor is used to sense the rotation frequency of the magnet. The control component has a magnetoresistive circuit, and the magnetoresistive resistor is communicated with the control component through the magnetoresistive circuit. The data measured by the operating frequency comparison component is used as comparison data, which facilitates the control component to compensate and correct the valve body measurement data, thereby greatly improving the flow measurement and control accuracy.

[0015] Furthermore, the shut-off valve is an electric ball valve, which is installed on a pipe through which fluid flows out. The control line of the electric ball valve is electrically connected to a control component, which has a conversion circuit. The control component controls the operation of the electric ball valve through the conversion circuit. The electric ball valve has good sealing performance, reduces leakage, and the measurement and control system is highly safe.

[0016] Furthermore, the control component is used to control the operation of the driving component, and the control component includes a processing circuit, a transmission circuit, a frequency conversion circuit, a key circuit, and a storage system. The transmission circuit, the frequency conversion circuit, the key circuit, and the storage system are respectively connected to the processing circuit in communication; the frequency conversion circuit is electrically connected to the driving component, and the processing circuit controls the operation of the driving component through the frequency conversion circuit; The control component transmits the signal to the host computer or terminal through the transmission circuit, and the control component realizes the integrated system configuration: the flow measurement function adopts the integrated digital data signal transmission method, so that a device can monitor the fluid status in real time, provide accurate data for production judgment, and greatly improve the safety and reliability of operators.

[0017] Compared with the prior art, the advantages of the present invention include: (1) The present invention provides an intelligent precision flow measurement and control instrument, which adopts an active flow control method to replace the traditional passive flow collection + flow regulation control, reduce the impact of passive flow fluctuations on measurement and control accuracy, and ensure measurement and control accuracy.

[0018] (2) The present invention provides an intelligent precision flow measurement and control instrument, which changes the regulating valve into a shut-off valve. Since the flow is actively controlled, the regulating valve does not need to be opened and closed frequently. Therefore, the shut-off valve in the present invention does not have frequent opening and closing actions. There is no need to worry about the problem of high damage rate of the regulating valve due to frequent operation of the shut-off valve, and its measurement and control stability is high.

[0019] (3) The present invention provides an intelligent precision flow measurement and control instrument, which compensates and corrects the measurement data through the mutual cooperation of the control component + the operating frequency comparison component, thereby greatly improving the flow measurement and control accuracy.

[0020] (4) The present invention provides an intelligent precision flow measurement and control instrument. Since the flow rate is actively regulated by the control component driving the two pump gears to rotate, there is no need for a high pressure in the pipeline. It can operate in a gravity pipeline and has a wide range of application scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments recorded in this application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 This is an overall schematic diagram of an intelligent precision flow measurement and control instrument in the present invention; Figure 2 This is a schematic diagram of the pump gear of an intelligent precision flow measurement and control instrument in the present invention; Figure 3 This is a schematic diagram of a metering cavity of an intelligent precision flow measurement and control instrument in the present invention; Figure 4 This is a schematic diagram of an operating frequency comparison component of an intelligent fine flow measurement and control instrument in the present invention; Figure 5 The figure is a circuit diagram of the control components of an intelligent precision flow measurement and control instrument in the present invention.

[0023] Reference numerals: 11. Valve body; 111. Base; 112. Upper cover; 113. Fastening screw; 114. Threaded hole; 21. Metering chamber; 22. Pump gear; 221. Tooth; 222. Gear shaft; 223. Bushing; 224. Pipe opening area; 23. Pipe; 24. Control component; 241. Magnetic sensitive circuit; 242. Conversion circuit; 243. Processing circuit; 244. Transmission circuit; 245. Frequency conversion circuit; 246. Key circuit; 247. Storage system; 25. Operating frequency comparison component; 251. Magnetic block; 252. Magnetic sensitive resistor; 26. Shut-off valve; 27. Drive component; 28. Connecting housing; 29. Meter head; 30. Pressure cover. DETAILED DESCRIPTION

[0024] In view of the deficiencies in the prior art, the inventors of this case have proposed the technical solution of the present invention after long-term research and extensive practice. The following will further explain the technical solution, its implementation process and principles, etc. in conjunction with the drawings in the embodiments of this application and specific implementation cases.

[0025] It should be noted that the embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as a limitation of the present invention. The described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, the present invention covers any alternatives, modifications, equivalent methods and solutions made within the spirit, principle and scope of the present invention defined by the claims. All other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0026] In the description of the present application, terms such as "first", "second", "third" and similar terms do not denote any order, quantity or importance, but are only used to distinguish different components. Similarly, terms such as "a" or "one" do not denote a quantity limitation, but mean that there is at least one. Terms such as "comprising" or "including" mean that the elements or items appearing before "comprising" or "including" cover the elements or items listed after "comprising" or "including" and their equivalents, and do not exclude other elements or items. Terms such as "connected" or "coupled" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

[0027] In the description of the present application, the orientation or positional relationship indicated by terms such as "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present application. In addition, when using position terms such as both sides, outer side, upper and lower, etc., it should be understood that they are only used for convenience of understanding and description, considering that the structure may be oriented to other positions.

[0028] In the description of the present application, unless otherwise clearly specified and limited, the technical terms or scientific terms used should have the ordinary meaning understood by those of ordinary skill in the art to which the present application belongs. Terms such as "installed", "connected", "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or a contact connection or an integral connection; for those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0029] The embodiments of the present invention are intended to introduce and explain the structural composition of the intelligent fine flow measurement and control instrument and the cooperation relationship between the various component structures. Unless otherwise specified, the dimensions, materials, manufacturing processes, etc. of the components suitable for the intelligent fine flow measurement and control instrument in the embodiments of the present invention can be selected according to specific circumstances, and no special limitations and explanations are made here.

[0030] Furthermore, in order to enable the public to have a better understanding of the present invention, some specific detailed parts are described in detail in the following detailed description of the present invention. Those skilled in the art can fully understand the present invention without the description of these detailed parts.

[0031] Embodiment 1 Please refer to Figure 1 、 Figure 2 and Figure 3 , an intelligent fine flow measurement and control instrument, comprising: A valve body 11, the valve body 11 is provided with a metering chamber 21; preferably, the valve body 11 is composed of a base 111 and an upper cover 112, the metering chamber 21 is opened between the upper cover 112 and the base, and a plurality of screw holes 114 are provided on the valve body 11 along the edge of the metering chamber. The upper cover 112 is provided with fastening screws 113 corresponding to the threaded holes 114, and each fastening screw 113 is threadedly connected to the corresponding screw hole 114 to fix the upper cover 112 and the base 111. The valve body 11 is composed of structures such as the base 111, the upper cover 112, and the fastening screws 113, which is convenient for quick assembly and disassembly; Two pump gears 22, the two pump gears 22 are meshed with each other and are both arranged in the metering chamber 21. When only one pump gear 22 is set for liquid cutting, if the pipeline pressure is high, the fluid is likely to leak, and the flow rate of the fluid flowing out is unstable. Therefore, at least two pump gears 22 are set to achieve stable cutting control of the fluid; for any pump gear 22, the pump gear 22 has a plurality of teeth 221 that are simultaneously in contact with both ends of the metering chamber 21. The plurality of teeth 221 are continuous teeth 221 arranged radially along the pump gear 22. When the teeth 221 are in contact with the inner wall of the metering chamber 21, the movement trajectory on the metering chamber 21 is the pipeline orifice area 224. The position of the pipeline orifice area 224 is set to guide the fluid to pass through one by one from the two pump gears 22 to stabilize the flow rate; The teeth 221 of the two pump gears 22 fit in with the metering chamber 21. The tooth side clearance of the pump gears 22 is a space for accommodating the fluid, thereby dividing the liquid entering the metering chamber 21. After the teeth 221 of the two pump gears 22 fit in with the metering chamber 21, the metering chamber 21 is divided into area a and area b. Area a and area b are areas where the pump gears 22 do not fit in with the wall of the metering chamber 21. They are distributed on both sides of the meshing position of the pump gears 22 and are mainly used to accommodate the fluid transported by the pump gears 22. The fluid here is most stable after being cut and transported. Both pipe opening areas 224 are provided with pipes 23 and respectively pass through the valve body 11. The pipe openings of the two pipes 23 are connected to the bottom of the metering chamber 21. The fluid flowing into the metering chamber 21 from the bottom is introduced into the metering chamber 21 by the position where several teeth 221 of the pump gear 22 are in contact with the metering chamber 21, and the fluid is divided by the pump gear 22; the free ends of the pipes 23 are welded with flanges, and the provision of flanges facilitates quick connection or quick disassembly with the pipes.

[0032] Specifically, the centers of the two pump gears 22 are equipped with gear shafts 222, and shaft sleeves 223 are installed at both ends of the gear shafts 222. The setting of the shaft sleeves 223 is to reduce friction and wear and protect the structure of the gear shafts 222; The shut-off valve 26 is installed on the fluid outflow pipe 23 to cut off the flow of the fluid. It only acts as a switch and does not require frequent adjustment. Traditional regulating valves are used to adjust the flow and are easily damaged. The driving component 27 is installed in the meter head 29. Preferably, the driving component 27 is a variable frequency motor. The driving component 27 is connected to any one of the pump gears 22 and drives the pump gear 22 to rotate. When the pump gear 22 rotates, the fluid in the corresponding pipe port area 224 is driven to flow into area a; then, when the other pump gear 22 rotates, the fluid in area b is driven to flow to the corresponding pipe port area 224. That is to say, the fluid entering the metering chamber 21 from the pipe port area 224 is cut by the corresponding pump gear 22, and after cutting, it is transported to area a by the pump gear 22. Then, the two pump gears 22 are meshed and driven to jointly transport the fluid in area a to area b. The fluid gathers in area b and is then divided and operated by the other pump gear 22. At this time, the fluid has been cut layer by layer and is relatively stable in the metering chamber, waiting for the next step. When it is operated to its corresponding pipe port area 224, it flows out from the pipe 23 corresponding to the pipe port area 224, completing the cutting and diversion of the liquid in the metering chamber 21. The product of the present invention realizes active control of the flow rate of the fluid passing through; A connecting housing 28 is installed between the valve body 11 and the meter head 28. The connecting housing 28 is fixed to the valve body 11 through a gland 30 and gland fastening screws, specifically fixed to the upper cover 112. The connecting housing 28 is installed outside the shaft of the driving component 27 and the gear shaft 222 that is directly driven and connected to the driving component 27. The connecting housing 28 protects the connection part between the shaft of the driving component 27 and the driving component 27. A control component 24, the control component 24 is communicatively connected to the driving component 27. The control component 24 is used to control the driving component 27 to drive the rotational speed of the corresponding pump gear 22. Different rotational speeds result in different fluid flow rates.

[0033] The valve body 11 has a meter head 28, the meter head 28 has a display screen, and the control component 24 and the driving component 27 are installed inside the meter head 28.

[0034] There are at least the following two structures between the metering chamber 21 and the pump gear 22: The first one, referring to Figure 2 , the metering chamber 21 includes two semi-circular segments 211 and a straight segment 212. The two semi-circular segments 211 are respectively arranged at both ends of the straight segment 212. The two pump gears 22 are respectively concentric with one of the semi-circular segments 211, and the diameters of the two pump gears 22 and the two semi-circular segments 211 are the same. The running track of the semi-circular segment 211 when the pump gear 22 rotates is the pipe orifice area 224; when the metering chamber 21 includes two semi-circular segments 211 and a straight segment 212, the fluid volumes in the a area and the b area are relatively small.

[0035] The second one, arc segments are arranged at both ends of the metering chamber 21. The radius of any one arc segment is the same as the radius of the pump gear 22. The two pump gears 22 are respectively attached to one of the arc segments. The arc segment is the running track of the pump gear 22 rotating, that is, the pipe orifice area 224; when the metering chamber 21 includes arc segments, compared with the semi-circular segments, the angle of the arc line can be smaller, and other areas can be set larger. At this time, the fluid volumes in the a area and the b area are larger.

[0036] Therefore, the structural shape of the metering chamber 21 can be more than just the above shape, and it can also be irregular except at both ends of the metering chamber 21.

[0037] Preferably, for one of the pipes 23, along the rotation direction of the pump gear 22, the pipe orifice of the pipe 23 is located at the front end or the rear end of the corresponding pipe orifice area 224, or for one of the pipes 23, along the rotation direction of the pump gear 22, the pipe orifice of the pipe 23 is located at the middle end of the corresponding pipe orifice area 224. Whether the pipe orifice of the pipe 23 is located at the front end, the rear end or the middle end of the pipe orifice area 224, the fluid can be cut and transported. However, when the pipe orifice of the pipe 23 is located at the middle end, compared with the front end or the rear end, the energy consumption and resistance of the driving component 27 during operation are the smallest.

[0038] Preferably, when the two pump gears 22 are fully meshed, there is a meshing clearance. Existing gears all have backlash, that is, a meshing clearance is generated for transporting liquid. This backlash can be further adjusted as needed to meet the requirements in different scenarios.

[0039] Preferably, referring to Figure 3 , the fluid in the metering chamber 21 flows out from one of the pipes 23. The diameter of the pipe 23 is smaller than that of the other pipe 23 to ensure a uniform flow of the fluid through a stable pressure difference. The diameter of the pipe through which the fluid flows into the valve body 11 is 1% smaller or 1 mm smaller than the diameter of the pipe orifice 23 from which the fluid flows out. The two pipes 23 are of different sizes, and the water inflow is greater than the water outflow, so that a sufficient amount of fluid can be stored in both the a area and the b area to supply the pump gear 22 for cutting and operation.

[0040] Preferably, the number of teeth of the two pump gears 22 is 12 - 22. Of course, the number of teeth can also be set according to the needs of refined scenarios. The higher the refined requirements, the more the corresponding number of gears. The number of teeth of the pump gear 22 can be 12, 13, 14, 15, 16, or can also be 17, 18, 19, 20, 21, 22. The number of teeth of the pump gear 22 within this range is the best in terms of machining accuracy, meshing performance, strength and durability, etc.

[0041] Furthermore, referring to Figure 4, also includes an operating frequency comparison component 25, the operating frequency comparison component 25 includes a magnetic block 251 and a magnetic sensitive resistor 252, the magnetic block 251 is installed on the gear shaft 222 of the pump gear 22 directly connected to the driving component 27, and the magnetic sensitive resistor 252 is installed on the valve body 11. Specifically, the magnetic sensitive circuit 252 is correspondingly installed in the connecting shell 28, and the magnetic sensitive circuit 29 is connected to the control component 24 through a wire. The magnetic sensitive resistor 252 is used to sense the rotation frequency of the magnetic block 251. The control component 24 has a magnetic sensitive circuit 241, and the magnetic sensitive resistor 252 is communicated with the control component 24 through the magnetic sensitive circuit 241. The data measured by the operating frequency comparison component 25 is used as comparison data, which facilitates the control component 24 to compensate and correct the measurement data of the valve body 11, greatly improving the flow measurement and control accuracy, and is more suitable for various refined work uses.

[0042] Furthermore, the shut-off valve 26 is an electric ball valve, which is installed on the pipe 23 through which the fluid flows out. The control line of the electric ball valve is electrically connected to the control component 24. The control component 24 has a conversion circuit 242. The control component 24 controls the operation of the electric ball valve through the conversion circuit 242. The electric ball valve is a valve that cuts off the flow of fluid. The traditional regulating valve used to regulate the fluid flow is changed into the electric ball valve 26, which avoids the frequent operation of the traditional regulating valve and has high measurement and control stability.

[0043] Further, refer to Figure 5 The control component 24 is used to control the operation of the driving component 23. The control component 24 includes a processing circuit 243, a transmission circuit 244, a frequency conversion circuit 245, a key circuit 246, and a storage system 247. The transmission circuit 244, the frequency conversion circuit 245, the key circuit 246, and the storage system 247 are communicatively connected to the processing circuit 243; the frequency conversion circuit 245 is electrically connected to the driving component 27, and the processing circuit 243 controls the operation of the driving component 27 through the frequency conversion circuit 244; The control component 24 transmits the signal to the host computer or terminal through the transmission circuit. The control component 24 realizes the integrated system configuration: the flow measurement function adopts the integrated digital data signal transmission method, so that one device can monitor the fluid status in real time, provide accurate data for production judgment, and greatly improve the safety and reliability of operators.

[0044] In some situations, such as when there is a need to measure special fluids, the coating is sprayed on the inner surface of the pipe, which can be used in special places to meet the needs of special fluid measurement. It is made of corrosion-resistant materials and has good corrosion resistance.

[0045] Working principle: Flange connection is adopted, which can be conveniently installed on the process pipeline 23 with low installation difficulty and convenient construction. The variable-frequency motor drives one of the pump gears 22 to rotate. At this time, the fluid entering the metering chamber 21 from one of the pipeline orifice areas 224 is cut by the corresponding pump gear 22. The pump gear 22 cuts and operates at the same time to stabilize the fluid for the first time, and then transports the fluid to area a. Then the two pump gears 22 mesh and drive together to transport the fluid in area a to area b. Since the gap between the two pump gears 22 is significantly smaller than that of a single pump gear 22, a small part of the transported fluid accumulates in area b, where the fluid is completely stabilized. The fluid in area b is then divided and operated by another pump gear 22, and is transported to the corresponding pipeline orifice area 224, and finally flows out from the pipeline 23 corresponding to the pipeline orifice area 224, completing the cutting and diversion of the liquid in the metering chamber 21; During the period when the fluid flows out from area b, through the pump gear 22 to the corresponding pipeline 23, the fluid is equally divided and operated by the pump gear 22, so the flow rate of the outflowing fluid is fixed. The fluid only flows out from one pump gear 22, and the controllable precision is high. By controlling the rotation speed of the pump gear 22, the flow rate of the required fluid can be obtained.

[0046] The product of the present invention adopts an active controllable measuring and controlling instrument, which changes the traditional passive flow rate into an active controllable flow rate. In this way, only by cooperating with the cut-off valve 26 can the configuration be completed, avoiding the use of a regulating valve; the active controllable measuring and controlling instrument can accurately control the fluid flow rate, so that the flow rate passing through it meets the requirements, and can provide accurate measuring and controlling data support for fine production.

[0047] For example, when setting the operation program for the control component 24 and clicking to run, the electric ball valve 26 opens, and the processing circuit 243 issues an execution command to the variable-frequency circuit 245. The variable-frequency circuit 245 drives the variable-frequency motor to run. The variable-frequency motor drives the pump gear 22 to rotate. The rotation of the pump gear 22 drives the liquid to flow and generates a flow rate, while dividing the fluid. Since the sizes of the metering chamber 21 and the pump gear 22 are designed well, for each rotation of the pump gear 22, the outlet flow rate is certain (the volume is fixed). In this way, as long as the rotation speed of the variable-frequency motor (that is, the rotation speed of the pump gear 22) is controlled, the flow rate can be known. According to the required flow rate, the rotation speed of the pump gear 22 can be controlled, which is the basis of active flow control.

[0048] A magnetic block 251 is installed on the gear shaft 222, and the magnetic block 251 acts with the magnetoresistor 252, so as to record the actual rotation frequency of the variable-frequency motor. The control component compares and calculates this data with the operating frequency of the frequency converter to eliminate the difference between the frequency converter frequency and the actual frequency, and improve the measuring and controlling precision.

[0049] In this way, the product of the present invention is not affected by the pressure in the pipeline, so the flow runs smoothly and the flow control accuracy is extremely high; since active flow control is adopted, the valve does not need to adjust the flow, so a shut-off valve can be selected; the valve does not participate in the adjustment, the valve cost is low, the valve does not move back and forth, and the valve has a long service life. The most critical shut-off valve has good sealing performance and does not leak.

[0050] It should be understood that the above embodiments are only for illustrating the technical concept and characteristics of the present invention, and their purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly. It cannot be determined that the specific implementation of the present invention is only limited to these descriptions. For those of ordinary skill in the technical field to which the present invention belongs, without departing from the concept of the present invention, several simple deductions or substitutions can be made. All equivalent changes or modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.

Claims

1. An intelligent fine flow measurement and control instrument, characterized in that: include: a valve body, wherein the valve body is provided with a metering cavity; Two pump gears, the two pump gears meshing with each other and both disposed within the metering cavity, each having a plurality of teeth simultaneously engaging with both ends of the metering cavity, wherein the orthographic projection of the motion trajectory of the teeth when engaging with the inner wall of the metering cavity forms a pipe opening region on the metering cavity; the plurality of teeth of the two pump gears engaging with the metering cavity divide the metering cavity into region a and region b; both pipe opening regions are provided with pipes that respectively penetrate the valve body; A shut-off valve is installed on the pipe where the fluid flows out to cut off the flow of the fluid; A driving component, wherein the driving component is connected to any one of the pump gears and drives the pump gear to rotate. When the pump gear rotates, the fluid in the corresponding pipe outlet area is driven to flow into area a; when the other pump gear rotates, the fluid in area b is driven to flow to the corresponding pipe outlet area; A control component is communicatively connected with the driving component, and is used to control the rotational speed of the corresponding pump gear driven by the driving component.

2. The intelligent fine flow measurement and control instrument according to claim 1, wherein: The metering cavity includes two semicircular segments and a straight segment. The two semicircular segments are respectively arranged at both ends of the straight segment. The two pump gears are respectively concentric with one of the semicircular segments, and the diameters of the two pump gears and the two semicircular segments are the same.

3. The intelligent fine flow measurement and control instrument according to claim 1, characterized in that: Both ends of the metering cavity are provided with arc segments, the radius of any arc segment is the same as the radius of the pump gear, and the two pump gears are respectively fitted with one arc segment.

4. The intelligent fine flow measurement and control instrument according to claim 1, wherein: For one of the pipelines, along the rotation direction of the corresponding pump gear, the pipe opening of the pipeline is located at the front end or the rear end of the corresponding pipeline opening area.

5. The intelligent fine flow measurement and control instrument according to claim 1, wherein: When the two pump gears are fully meshed, there is meshing clearance.

6. The intelligent fine flow measurement and control instrument according to claim 1, wherein: The fluid in the metering cavity flows out from one of the pipes, and the diameter of the pipe is smaller than the diameter of the other pipe.

7. The intelligent fine flow measurement and control instrument according to claim 1, characterized in that: For one of the pipelines, along the rotation direction of the corresponding pump gear, the pipe opening of the pipeline is located at the middle end of the corresponding pipeline opening area.

8. The intelligent fine flow measurement and control instrument according to claim 1, wherein: It also includes an operating frequency comparison component, which includes a magnetic block and a magnetic sensitive resistor. The magnetic block is installed on the gear shaft of the pump gear that is transmission-connected to the driving component. The magnetic sensitive resistor is installed on the valve body. The magnetic sensitive resistor is used to sense the rotation frequency of the magnetic block. The control component is provided with a magnetic sensitive circuit, and the magnetic sensitive resistor is communicatively connected to the control component through the magnetic sensitive circuit.

9. The intelligent fine flow measurement and control instrument according to claim 1, characterized in that: The shut-off valve is an electric ball valve, which is installed on a pipe through which fluid flows out. The control line of the electric ball valve is electrically connected to a control component, which is provided with a conversion circuit. The control component controls the operation of the electric ball valve through the conversion circuit.

10. The intelligent fine flow measurement and control instrument according to claim 1, characterized in that: The control component is used to control the operation of the drive component. The control component includes a processing circuit, a transmission circuit, a frequency conversion circuit, a key circuit, and a storage system. The transmission circuit, the frequency conversion circuit, the key circuit, and the storage system are respectively communicated with the processing circuit; the frequency conversion circuit is electrically connected to the drive component, and the processing circuit controls the operation of the drive component through the frequency conversion circuit.

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