Electromagnetic flowmeter

Abstract

The electromagnetic flowmeter comprises a flowmeter body, a treatment box, an air exhaust assembly, a filter screen, a driving assembly and a first transmission assembly, the flowmeter body is provided with a liquid inlet end, a cylindrical treatment cavity is formed in the treatment box, the treatment cavity is horizontally arranged, the lower portions of the two ends of the treatment cavity are communicated with a liquid inlet and a liquid outlet respectively, and the liquid inlet is communicated with the liquid outlet. The liquid outlet is communicated with the liquid inlet end of the flowmeter body, the air exhaust assembly is provided with an air exhaust opening, the air exhaust opening is communicated with the top of the treatment cavity, the filter screen is vertically arranged in the treatment cavity and rotationally connected with the treatment box, the driving assembly is used for driving the filter screen to rotate, and the first transmission assembly is arranged between the filter screen and the air exhaust assembly. And the filter screen rotates to enable the air exhaust assembly to operate. The invention aims to solve the technical problems that the measurement precision is influenced and the electrode of the flowmeter and the inner wall of a measuring tube are damaged due to bubbles and impurities in liquid.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of flow measurement, and particularly relates to an electromagnetic flowmeter. BACKGROUND

[0002] An electromagnetic flowmeter works based on Faraday's law of electromagnetic induction: when a conductive fluid (such as water, acid-base solution, slurry, etc.) vertically cuts a uniform magnetic field, an induced electromotive force proportional to the flow rate will be generated in the fluid. By measuring the potential difference between the electrodes, the volumetric flow rate of the fluid can be calculated. However, there are the following defects when the electromagnetic flowmeter measures a fluid (such as wort in beer brewing, which contains water bubbles and grain debris): When there are gas bubbles in the fluid, the gas bubbles will occupy part of the fluid space, reducing the effective conductive fluid area involved in electromagnetic induction. In addition, the gas bubbles will form an uneven flow rate distribution in the fluid, which will cause the average flow rate measured by the electromagnetic flowmeter to deviate from the actual flow rate.

[0003] The density of impurities (i.e., solid particles) in the liquid is usually greater than the density of the fluid, which will settle in the fluid. The flow rate at the bottom of the pipe slows down, and the flow rate at the top relatively speeds up. This change in flow rate distribution will also affect the measurement accuracy of the electromagnetic flowmeter. In addition, the solid particles flowing in the fluid will cause wear and erosion to the electrodes and the inner wall of the measuring pipe. SUMMARY

[0004] In view of the deficiencies of the prior art, the purpose of the present application is to provide an electromagnetic flowmeter to solve the technical problems of affecting the measurement accuracy due to the presence of gas bubbles and impurities in the liquid and causing damage to the electrodes and the inner wall of the measuring pipe of the flowmeter.

[0005] To achieve the foregoing purposes of the application, the technical solution adopted by the present application comprises: an electromagnetic flowmeter, comprising a flowmeter body, the flowmeter body having a liquid inlet end, further comprising: a treatment box, the treatment box having a cylindrical treatment cavity inside, the treatment cavity being horizontally arranged, the lower part of both ends of the treatment cavity being respectively connected with a liquid inlet and a liquid outlet, the liquid outlet being connected with the liquid inlet end of the flowmeter body; a gas extraction assembly, the gas extraction assembly having a gas extraction port, the gas extraction port being connected with the top of the treatment cavity; a filter screen, the filter screen being vertically arranged in the treatment cavity, the filter screen being rotatably connected with the treatment box; a driving assembly, the driving assembly being used to drive the rotation of the filter screen; a first transmission assembly, the first transmission assembly being arranged between the filter screen and the gas extraction assembly, the rotation of the filter screen being capable of causing the gas extraction assembly to operate.

[0006] Compared with the prior art, the present application has the following advantages: (1) The electromagnetic flowmeter provided by the application can effectively intercept solid impurities such as particles and suspended matters in the liquid, prevent the impurities from entering the flowmeter body, avoid the wear or blockage of the impurities on the electrodes and pipelines in the flowmeter, prolong the service life of the flowmeter, and reduce the maintenance cost. In addition, the density of the impurities is usually greater than the density of the fluid, and the impurities will settle in the fluid. The impurities are removed by the filter screen, the possibility of the impurities settling at the bottom of the pipeline is reduced, the flow rate at the bottom of the pipeline is more close to the flow rate at the top, and the measurement accuracy is improved.

[0007] (2) The electromagnetic flowmeter provided by the application can drive the filter screen to rotate through the driving assembly, and then the contact position of the filter screen and the liquid can be changed, so that different parts of the filter screen can filter the liquid in turn, which helps to improve the filtering effect of the filter screen. In addition, when the filter screen rotates, the impurities adhered to the filter screen will produce relative friction with the liquid, and then the impurities will fall off from the filter screen.

[0008] (3) The electromagnetic flowmeter provided by the application is provided with an air extraction port of the air extraction assembly and a top of the processing cavity, so that the air extraction assembly can continuously extract the gas on the upper side of the processing cavity. When the upper side gas is extracted, the upper side pressure is reduced, the gas bubbles in the liquid will expand due to the decrease of the external pressure, the volume of the gas bubbles is expanded, the buoyancy of the gas bubbles is increased, the gas bubbles rise to the liquid surface, and the gas bubbles in the liquid are extracted by the air extraction assembly after the gas bubbles are separated from the liquid surface, and then the upper side pressure is reduced, so that the circulation is formed.

[0009] The elimination of the gas bubbles in the liquid can relatively increase the space occupied by the liquid, and then the effective conductive fluid area participating in electromagnetic induction is more close to the cross-sectional area of the pipeline in the flowmeter body, and then the accuracy of the flowmetering is improved. The elimination of the aggregation of the gas bubbles in the liquid can form a more uniform flow rate distribution. The uniform flow rate distribution can make the average flow rate measured by the electromagnetic flowmeter more close to the actual flow rate, and helps to improve the detection accuracy. The elimination of the gas bubbles in the liquid can reduce the possibility of the gas bubbles forming a gas film on the electrode surface, so that the possibility of the gas bubbles covering the entire electrode surface when passing through the electrode, causing the electrode loop to be instantaneously disconnected and the output signal to fluctuate is reduced, and the measurement stability of the flowmeter body is improved.

[0010] (4) The electromagnetic flowmeter provided by the application is provided with a first transmission assembly, which realizes the linkage between the rotation of the filter screen and the operation of the air extraction assembly. When the filter screen rotates, the first transmission assembly transmits the rotary motion to the air extraction assembly, and triggers the air extraction assembly to start working. The complicated control circuit and driving device for the air extraction assembly are effectively avoided, the structure of the entire electromagnetic flowmeter is simplified, and the manufacturing cost is reduced.

[0011] Further, the processing cavity is provided with a ring groove coaxially arranged with the processing cavity, the filter screen is located in the ring groove, the outer edge of the filter screen abuts against the bottom of the ring groove, the thickness of the filter screen is less than the thickness of the ring groove, and the filter screen abuts against the side of the ring groove close to the flowmeter body; The center of the filter screen is provided with a rotating shaft rotationally connected with the processing box, and the rotating shaft is coaxially arranged with the processing cavity. The driving assembly is used to drive the rotating shaft to rotate. The side of the filter screen away from the flowmeter body is provided with a collecting plate, the collecting plate is located in the ring groove, and the filter screen rotation can drive the collecting plate to rotate. The processing cavity is internally provided with a collecting box, the collecting box is a hollow structure with an open top, the collecting box is horizontally arranged, the collecting box is located above the rotating shaft, the filter screen rotation can drive the collecting plate to rotate, the collecting plate rotation can drive the impurities located in the ring groove to move upward along with the collecting plate, and when the impurities are at a certain height, the impurities fall into the collecting box along the collecting plate under the action of gravity.

[0012] Further, a spiral conveying member is rotationally connected in the collecting box, the spiral conveying member is arranged along a direction perpendicular to the axis of the processing cavity, one end of the spiral conveying member is provided with a connecting pipe, one end of the connecting pipe is in communication with the air suction port of the air suction assembly, and the other end of the connecting pipe is in communication with the inside of the collecting box. A second transmission assembly is arranged between the spiral conveying member and the rotating shaft, and through the second transmission assembly, the rotating shaft rotation can drive the spiral conveying member to rotate to convey the impurities located in the collecting box to the side of the connecting pipe.

[0013] Further, the collecting box is provided with a slope portion, the slope portion is upwardly arranged close to the side of the filter screen away from the spiral conveying member.

[0014] Further, the side of the slope portion close to the filter screen abuts against the filter screen.

[0015] Further, the air suction assembly comprises a cylinder, the cylinder is a hollow cylindrical structure with open ends, the cylinder is internally provided with a piston, the piston is slidingly and sealingly connected with the cylinder along the length direction of the cylinder, the cylinder is internally provided with a connecting rod, one end of the connecting rod is fixedly connected with the piston, and the other end of the connecting rod extends out of the cylinder along one end of the cylinder and is in transmission connection with the first transmission assembly, the rotating shaft rotation can drive the connecting rod to slide along the axis direction of the cylinder to drive the piston to slide along the axis direction of the cylinder through the first transmission assembly. The cylinder is provided with a cover plate away from the connecting rod, the cover plate is used to seal the end of the cylinder away from the connecting rod, the cover plate is slidingly connected with the cylinder along the length direction of the cylinder, a first elastic member is arranged between the cover plate and the cylinder, and when the first elastic member is in a natural state, the cover plate sealingly abuts against the cylinder. The guide pipe is communicated with one end of the connecting pipe far away from the collecting box and extends into the cylinder through the cover plate.

[0016] Further, the filter screen is provided with a vibration assembly for vibrating the filter screen.

[0017] Further, the vibration assembly comprises a rotating block fixedly connected with the rotating shaft, the rotating block has an inclined surface, a flat surface and a vertical surface, the flat surface is arranged between the inclined surface and the vertical surface, the vertical surface, the flat surface and the inclined surface are sequentially arranged along the rotating direction of the rotating shaft, the flat surface is parallel to the filter screen, and the vertical surface is perpendicular to the filter screen. The processing cavity is internally provided with a mounting rod arranged along the length direction of the processing cavity, a knocking rod is slidably connected with the mounting rod along the axial direction of the mounting rod, a second elastic member is arranged between the knocking rod and the mounting rod, and one end of the knocking rod far away from the mounting rod abuts against the filter screen.

[0018] Further, the processing box is provided with a pressure control structure on the top. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments described in the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0020] Figure 1 The structure schematic diagram of the embodiment of the present application is shown in the figure. Figure 2 The structure schematic diagram of the embodiment of the present application is shown in the figure. Figure 1 The sectional structure schematic diagram of the embodiment of the present application is shown in the figure. Figure 1 ;The sectional structure schematic diagram of the embodiment of the present application is shown in the figure. Figure 3 The sectional structure schematic diagram of the embodiment of the present application is shown in the figure. Figure 1 The sectional structure schematic diagram of the embodiment of the present application is shown in the figure. Figure 2 ; The sectional structure schematic diagram of the embodiment of the present application is shown in the figure. Figure 4 The sectional structure schematic diagram of the embodiment of the present application is shown in the figure. Figure 1 The sectional structure schematic diagram of the embodiment of the present application is shown in the figure. Figure 3 .

[0021] Reference signs: Flow meter body 1, liquid inlet end 2, processing box 3, filter screen 4, processing cavity 5, ring groove 6, rotating shaft 7, collection plate 8, collection box 9, motor 10, first transmission wheel 11, second transmission wheel 12, spiral conveying piece 13, connecting pipe 14, third transmission wheel 15, fourth transmission wheel 16, worm gear 17, worm 18, slope part 19, barrel 20, piston 21, connecting rod 22, cover plate 23, flow guide pipe 24, feed one-way valve 25, sliding hole 26, sliding column 27, first spring 28, sealing ring 29, mounting plate 30, reciprocating screw rod 31, sliding block 32, limiting rod 33, rotating block 34, inclined surface 35, flat surface 36, vertical surface 37, mounting rod 38, knocking rod 39, sliding rod 40, second spring 41, mounting seat 42, adjusting pipe 43, third spring 44. DETAILED DESCRIPTION

[0022] In view of the deficiencies in the prior art, the present inventors have, through long-term research and a large number of practices, come up with the technical solution of the present application. The technical solution, its implementation process and principles will be further explained below in combination with the drawings and specific implementation cases in the embodiments of the present application.

[0023] It should be noted that the embodiments described below by reference to the drawings are exemplary and are only used to explain the present application and cannot be understood as limiting the present application. The described embodiments are only a part of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, the present application covers any alternative, modification, equivalent method and solution defined by the claims, and all other embodiments obtained by those of ordinary skill in the art without making creative efforts, which all fall within the scope of protection of the present application.

[0024] In the description of the present application, "first", "second", "third" and similar words do not represent any order, quantity or importance, but are only used to distinguish different components. Similarly, "one" or "a" and similar words do not represent a quantity limit, but represent the existence of at least one. "Include" or "contain" and similar words mean that the elements or objects appearing before "include" or "contain" cover the elements or objects listed after "include" or "contain" and their equivalents, and do not exclude other elements or objects. "Connected" or "connected" and similar words are not limited to physical or mechanical connection, but can include electrical connection, whether direct or indirect.

[0025] In the description of the present application, the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "back", "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, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, when using two sides, outer sides, upper and lower position terms, it should be understood that they are only used for the convenience of understanding and description, considering that the structure can be facing other positions.

[0026] In the description of the present application, unless otherwise explicitly specified and limited, the technical terms or scientific terms used should be understood as the general meaning understood by those skilled in the art to which the present application belongs, and the terms "mounting", "connection", "connection" and the like should be understood in a broad sense, for example, it can be fixed connection, it can also be detachable connection, it can also be in contact connection or integral connection; for those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0027] Please refer to Figures 1-4 The present application provides a technical solution: an electromagnetic flowmeter, comprising a flowmeter body 1, the flowmeter body 1 has a liquid inlet end 2. The flowmeter body 1 is the core measuring component of the whole device, used for measuring the flow of liquid passing through its inside. The flowmeter body 1 is based on the principle of electromagnetic induction. When the conductive liquid flows vertically in the magnetic field, an induced electromotive force will be generated in the direction perpendicular to the flow direction and the magnetic field direction. By measuring the size of the induced electromotive force, combined with known magnetic field intensity and pipeline size parameters, the flow of the liquid can be calculated. The electromagnetic conversion mode of the electromagnetic flowmeter is based on Faraday's law of electromagnetic induction. Its core is to generate an induced electromotive force through the interaction of the magnetic field and the conductive liquid, and then convert it into a measurable flow signal. The electromagnetic flowmeter is composed of a sensor and a converter. The magnetic field perpendicular to the liquid flow direction is generated by the excitation coil, and the induced electromotive force generated by the liquid flow is detected by the electrode on the inner wall of the pipeline, and is converted into a weak electric signal. The weak electric signal output by the sensor is amplified to a processable range by the converter, and then displayed on the indicator.

[0028] The electromagnetic flowmeter further comprises a processing box 3, an air extraction assembly, a filter screen 4, a driving assembly and a first transmission assembly.

[0029] The processing box 3 has a cylindrical processing cavity 5 inside, which is horizontally arranged and provides a specific space for liquid processing, so as to remove impurities and gas in the liquid entering the flowmeter body 1, thereby improving the accuracy and stability of measurement. The lower part of the processing cavity 5 at both ends is respectively communicated with a liquid inlet and a liquid outlet, and the liquid outlet is communicated with the liquid inlet end 2 of the flowmeter body 1. The liquid can flow through the liquid inlet- processing cavity 5- liquid outlet- flowmeter body 1.

[0030] The air extraction assembly has an air extraction port communicated with the top of the processing cavity 5. The air extraction assembly is used to extract the gas at the top of the processing cavity 5 (the gas above the liquid level in the processing cavity 5), thereby reducing the air pressure on the upper side of the processing cavity 5. When the upper side pressure is reduced, the gas bubbles in the liquid will expand due to the decrease of external pressure, and the buoyancy of the gas bubbles will increase, so that the gas bubbles rise out of the liquid level.

[0031] The filter screen 4 is vertically arranged in the processing cavity 5, and the filter screen 4 is rotationally connected with the processing box 3. When the liquid flows through the processing cavity 5, the filter screen 4 will intercept the impurities in the liquid, and the relatively clean liquid will continue to flow through the filter screen 4. The rotation of the filter screen 4 can change the contact position of the filter screen 4 with the liquid, so that different parts of the filter screen 4 can filter the liquid in turn, which helps to improve the filtering effect of the filter screen 4. In addition, when the filter screen 4 rotates, the impurities adhered to the filter screen 4 will produce relative friction with the liquid, thereby promoting the impurities to fall off from the filter screen 4.

[0032] The driving assembly is used to drive the rotation of the filter screen 4. The driving assembly provides power for the rotation of the filter screen 4, so that the filter screen 4 can continuously rotate at a set speed and direction, so as to achieve good filtering effect.

[0033] The first transmission assembly is arranged between the filter screen 4 and the air extraction assembly, and the rotation of the filter screen 4 can drive the air extraction assembly to work. The first transmission assembly establishes a connection between the filter screen 4 and the air extraction assembly, and converts the rotation of the filter screen 4 into the operation of the air extraction assembly, so as to realize the linkage between the rotation of the filter screen 4 and the air extraction action.

[0034] In use: Firstly, the installation and connection of the equipment are carried out. The processing box 3 is stably fixed in a suitable position, and the liquid inlet is accurately connected with the source pipeline of the liquid to be measured, and the liquid outlet is closely connected with the liquid inlet end 2 of the flowmeter body 1. In this way, the liquid to be measured can flow smoothly from the liquid inlet into the processing cavity 5 in the processing box 3, and then enter the flowmeter body 1 from the liquid outlet after being processed.

[0035] Next, the driving assembly is started. The driving assembly begins to operate and transmits power to the filter screen 4, so that the filter screen 4 continuously rotates in the processing cavity 5 at a set speed. At the same time, with the rotation of the filter screen 4, the first transmission assembly begins to work. The first transmission assembly skillfully converts the rotary motion of the filter screen 4 into the operating power of the air extraction assembly, so that the air extraction port of the air extraction assembly generates negative pressure and starts to extract the gas at the top of the processing cavity 5.

[0036] Subsequently, the liquid to be measured flows into the processing box 3. The liquid to be measured enters the processing cavity 5 of the processing box 3 from the liquid inlet. Since the processing cavity 5 is horizontally arranged, the liquid flows horizontally in the processing cavity 5. At this time, the filter screen 4 vertically arranged in the processing cavity 5 begins to filter the flowing liquid. The impurities in the liquid are intercepted by the filter screen 4 and adhere to the surface of the filter screen 4; and the relatively clean liquid can pass through the filter screen 4 and continue to flow forward.

[0037] During the liquid flow, the top of the processing cavity 5 maintains a negative pressure state due to the continuous operation of the air extraction assembly, so that the pressure above the processing cavity 5 is reduced. The dissolved gas in the liquid gradually separates out to form bubbles due to the change in pressure; at the same time, the air originally existing in the processing cavity 5 is located above the liquid. These gases are extracted out of the processing cavity 5 by the air extraction assembly under the action of negative pressure, thereby effectively reducing the gas content in the liquid.

[0038] Finally, the flow rate is measured. The clean liquid after being filtered by the filter screen 4 and extracted by the air extraction assembly flows out of the liquid outlet of the processing cavity 5, enters the liquid inlet end 2 of the flowmeter body 1, and then flows through the measuring pipeline of the flowmeter body 1. At this time, the flowmeter body 1 begins to work based on the principle of electromagnetic induction, accurately calculates the flow rate of the liquid through a specific algorithm, and outputs the measurement results in the form of electrical signals or digital display, so that the staff can obtain relevant data.

[0039] Referring to Figure 3 In the embodiment, the processing cavity 5 is provided with a ring groove 6, the ring groove 6 is coaxially arranged with the processing cavity 5, and the ring groove 6 provides a space for impurity collection. The impurities intercepted by the filter screen 4 will fall into the ring groove 6 under the action of gravity. The filter screen 4 is located in the ring groove 6, the outer edge of the filter screen 4 abuts against the bottom of the ring groove 6, the thickness of the filter screen 4 is less than the thickness of the ring groove 6, and the thickness of the ring groove 6 refers to the length along the axis direction of the ring groove 6. Because the length is relatively short, it is named as thickness. The filter screen 4 abuts against the side of the ring groove 6 close to the flowmeter body 1. In other words, the ring groove 6 has a certain space on the side away from the flowmeter body 1, and this space is used for collecting the impurities intercepted by the filter screen 4.

[0040] A rotating shaft 7 is arranged at the center position of the filter screen 4, the rotating shaft 7 is rotationally connected with the processing box 3, and the rotating shaft 7 is coaxially arranged with the processing cavity 5. The driving assembly is used to drive the rotating shaft 7 to rotate, and the rotating shaft 7 can drive the filter screen 4 to rotate.

[0041] The filter screen 4 is provided with a collecting plate 8 away from the flowmeter body 1, the collecting plate 8 is located in the ring groove 6, and the filter screen 4 can drive the collecting plate 8 to rotate. Specifically, as shown in Figure 3 The collecting plate 8 is perpendicular to the filter screen 4, and the collecting plate 8 is inclined to the rotating direction of the rotating shaft 7 near one end of the rotating shaft 7. The outer side of the collecting plate 8 abuts against the bottom of the ring groove 6. When the collecting plate 8 rotates with the filter screen 4, a tapered (the included angle is less than 90 degrees) collecting space is formed between the collecting plate 8 and the ring groove 6. This setting is to make the impurities in the tapered collecting space fall along the collecting plate 8 under the action of gravity only when the collecting plate 8 rotates above the rotating shaft 7.

[0042] The processing cavity 5 is provided with a collecting box 9 inside, and the collecting box 9 is fixedly connected in the processing cavity 5. The collecting box 9 is a hollow structure with an open top, which is convenient for the impurities falling from the collecting plate 8 to fall into the collecting box 9. The collecting box 9 is horizontally arranged, and the collecting box 9 is arranged perpendicular to the direction of the rotating shaft 7 axis, and the collecting box 9 is located above the rotating shaft 7. The filter screen 4 can drive the collecting plate 8 to rotate, and the impurities in the ring groove 6 can move upward with the collecting plate 8, and fall into the collecting box 9 under the action of gravity when they are at a certain height. The collecting box 9 can store a certain amount of impurities, reduce the accumulation of impurities under the filter screen 4, and further affect the use of the filter screen 4.

[0043] Further, the collecting plate 8 is provided with a first through hole penetrating along the thickness direction of the collecting plate 8, and the first through hole is used for the liquid in the tapered collecting space to pass through, thereby reducing the possibility of the liquid entering the collecting box 9.

[0044] Referring to Figure 1 Specifically, the driving assembly includes a motor 10, a first transmission wheel 11 and a second transmission wheel 12. The first transmission wheel 11 is fixedly connected with the rotating shaft 7 and coaxially arranged. The second transmission wheel 12 is fixedly connected with the output shaft of the motor 10 and coaxially arranged. The first transmission wheel 11 and the second transmission wheel 12 are drivingly connected by a belt, a synchronous belt or a chain.

[0045] Referring to Figure 3In the embodiment, the collecting box 9 is rotationally connected with a spiral conveying member 13, the spiral conveying member 13 is arranged along the direction perpendicular to the axis of the processing cavity 5, and the spiral conveying member 13 is generally a spiral blade with a shaft, which can push the impurities to move along the axial direction of the spiral conveying member 13 when it rotates around the shaft. The spiral conveying member 13 is provided with a connecting pipe 14 at one end, the connecting pipe 14 is in communication with the suction port of the suction assembly at one end, and the other end of the connecting pipe 14 is in communication with the inside of the collecting box 9. The connecting pipe 14 establishes a channel between the collecting box 9 and the suction assembly, so that the suction assembly can extract the gas and impurities in the collecting box 9 through the connecting pipe 14. When the suction assembly works, a negative pressure is formed in the connecting pipe 14, so that the gas and impurities in the collecting box 9 can be sucked into the suction assembly along the connecting pipe 14, thereby realizing the discharge of the impurities.

[0046] The second transmission assembly is arranged between the spiral conveying member 13 and the rotating shaft 7, and the second transmission assembly transmits the rotating power of the rotating shaft 7 to the spiral conveying member 13, so that the spiral conveying member 13 can rotate with the rotating shaft 7, thereby realizing the transmission and conversion of power. The rotation of the spiral conveying member 13 can convey the impurities in the collecting box 9 to the side of the connecting pipe 14, thereby facilitating the extraction by the suction assembly.

[0047] In specific implementation: ①, the design of the connecting pipe 14 establishes the connection between the collecting box 9 and the suction assembly. When the suction assembly works, a negative pressure environment is formed at the end of the connecting pipe 14 close to the collecting box 9, which helps to smoothly suck out the impurities near the connecting pipe 14. In addition, the spiral conveying member 13 conveys the impurities to the side of the connecting pipe 14, which enhances the effect of impurity collection and discharge and improves the impurity treatment capacity of the whole system.

[0048] ②, the second transmission assembly transmits the rotating power of the rotating shaft 7 to the spiral conveying member 13, which realizes the purpose of driving multiple components to work at the same time through one power source, simplifies the system structure, and reduces the cost and energy consumption.

[0049] Specifically, the second transmission assembly includes a third transmission wheel 15, a fourth transmission wheel 16, a worm wheel 17, and a worm 18. The third transmission wheel 15 is coaxially fixed at the end of the spiral conveying member 13 away from the connecting pipe 14, the fourth transmission wheel 16 is rotationally connected at the bottom of the collecting box 9, and the third transmission wheel 15 and the fourth transmission wheel 16 are transmissionally connected by a belt, a synchronous belt, a chain or the like. The worm wheel 17 is rotationally connected at the bottom of the collecting box 9, the worm wheel 17 is coaxially arranged with the fourth transmission wheel 16, the worm wheel 17 is fixedly connected with the fourth transmission wheel 16, the worm 18 is provided with a second through hole extending along the axial direction of the worm 18 at the end, the second through hole penetrates the worm 18, the worm 18 is sleeved on the rotating shaft 7, the worm 18 is fixedly connected with the rotating shaft 7, and the worm 18 is engaged with the worm wheel 17.

[0050] The rotation shaft 7 starts to rotate, and since the worm 18 is sleeved on the rotation shaft 7 and fixedly connected with the rotation shaft 7, the rotation of the rotation shaft 7 directly drives the worm 18 to rotate synchronously. When the worm 18 rotates, according to the transmission principle of the worm 18 and the worm gear 17, the worm 18 transmits power to the worm gear 17, so that the worm gear 17 rotates around its own axis. The rotation of the worm gear 17 drives the fourth transmission gear 16 to rotate around the same axis. When the fourth transmission gear 16 rotates, power is transmitted to the third transmission gear 15 through the belt, synchronous belt or chain, so that the third transmission gear 15 rotates. The third transmission gear 15 rotates, and since it is coaxially fixed with the spiral conveying piece 13, it drives the spiral conveying piece 13 to rotate around its own axis, so as to convey the impurities in the collecting box 9 to the side of the connecting pipe 14.

[0051] Referring to Figure 3 In the embodiment: in order to make the impurities falling into the collecting box 9 be effectively conveyed by the spiral conveying piece 13, the collecting box 9 is provided with a slope portion 19, which is inclined upward near the side of the filter screen 4. The spiral conveying piece 13 is located away from the side of the filter screen 4. The impurities falling into the collecting box 9 slide along the slope portion 19 to the side of the spiral conveying piece 13 under the action of gravity, and are then more conveniently conveyed by the spiral conveying piece 13.

[0052] Referring to Figure 3 In the embodiment: in order to facilitate the impurities adhering to the filter screen 4 to be scraped off and collected into the collecting box 9, the side of the slope portion 19 close to the filter screen 4 abuts against the filter screen 4. Through the above-mentioned arrangement, during the rotation of the filter screen 4, the side of the slope portion 19 close to the filter screen 4 scrapes off the impurities adhering to the filter screen 4, and the scraped-off impurities slide along the slope portion 19 to the side of the spiral conveying piece 13, and are then conveyed by the spiral conveying piece 13.

[0053] Referring to Figures 1-2In the embodiment, the air extraction assembly includes a cylinder 20, which is a hollow cylindrical structure with both ends open. The cylinder 20 serves as the main structure of the entire air extraction assembly, provides space for the installation and operation of other components, and is a key container for forming a negative pressure environment and achieving gas and impurity extraction and storage. The cylinder 20 is internally provided with a piston 21, which is in sliding seal connection with the cylinder 20 along the length direction of the cylinder 20. The piston 21 reciprocally slides in the cylinder 20 to generate a pressure difference by changing the volume inside the cylinder 20, thereby achieving air extraction and exhaust operation. The cylinder 20 is internally provided with a connecting rod 22, one end of which is fixedly connected with the piston 21, and the other end extends out of the cylinder 20 along one end of the cylinder 20 and is in transmission connection with the first transmission assembly. The connecting rod 22 connects the piston 21 and the first transmission assembly, and transmits the power transmitted by the first transmission assembly to the piston 21, so that the piston 21 can move linearly in the cylinder 20. The rotation of the shaft 7 can make the connecting rod 22 slide along the axis direction of the cylinder 20 to make the piston 21 slide along the axis direction of the cylinder 20.

[0054] The cylinder 20 is provided with a cover plate 23 away from one end of the connecting rod 22. The cover plate 23 is used to seal the end of the cylinder 20 away from the connecting rod 22, and is in sliding connection with the cylinder 20 along the length direction of the cylinder 20. The cylinder 20 is used to seal the end of the cylinder 20 away from the connecting rod 22, and prevents gas and impurities from leaking from this end during the air extraction process, so that the air extraction assembly can work normally. A first elastic member is arranged between the cover plate 23 and the cylinder 20. When the first elastic member is in a natural state, the cover plate 23 is in sealing abutment with the cylinder 20. Under the action of the first elastic member and without external force, the cover plate 23 is in sealing abutment with the cylinder 20, thereby playing a sealing role. When the internal pressure of the cylinder 20 increases (i.e., when the piston 21 pushes the exhaust), the cover plate 23 can slide a certain distance away from the cylinder 20 under the action of the pressure, so that the opening of the end of the cylinder 20 close to the cover plate 23 is opened, thereby facilitating the discharge of impurities and gas sucked into the inside of the cylinder 20. When the internal pressure of the cylinder 20 decreases (i.e., when the piston 21 pushes the air), the cover plate 23 is in sealing abutment with the cylinder 20 in the natural state of the first elastic member, and the negative pressure action makes the cover plate 23 abut on the cylinder 20 to form a seal.

[0055] A flow guide pipe 24 is arranged between the cylinder 20 and the connecting pipe 14. One end of the flow guide pipe 24 is in communication with the end of the connecting pipe 14 away from the collection box 9, and the other end extends into the cylinder 20 through the cover plate 23. The flow guide pipe 24 connects the cylinder 20 and the connecting pipe 14, providing a passage for the gas and impurities to enter the cylinder 20 from the connecting pipe 14. When a negative pressure is formed inside the cylinder 20, the gas and impurities in the connecting pipe 14 will be sucked into the cylinder 20 through the flow guide pipe 24, realizing the collection of the impurities and gas. A feeding one-way valve 25 is arranged on the connecting pipe 14. The feeding one-way valve 25 controls the flow direction of the gas and impurities, allowing only the gas and impurities to enter the cylinder 20 from the connecting pipe 14, reducing the possibility of the gas and impurities in the cylinder 20 flowing back to the connecting pipe 14 and the collection box 9, and enabling the air extraction assembly to work normally. The feeding one-way valve can be a one-way valve suitable for both gas and solid phases, such as a swing check valve, which rotates around a hinge to open and close, and the valve disc has a large opening angle and is not easy to be blocked by particles.

[0056] In specific implementation: ①, the connection between the piston 21 and the first transmission assembly is established through the connecting rod 22, and the rotation of the rotating shaft 7 is converted into the linear motion of the connecting rod 22 by means of the first transmission assembly, thereby driving the piston 21 to perform reciprocating linear motion in the cylinder 20. The rotation is ingeniously converted into linear motion, achieving the purpose of controlling the movement of the piston 21 by rotating the rotating shaft 7, so that the air extraction assembly can work cooperatively with other parts of the entire system. Moreover, no additional power source is needed to drive the piston 21, reducing cost and energy consumption.

[0057] ②, when the pressure inside the cylinder 20 changes, the cover plate 23 can automatically slide under the combined action of the pressure and the first elastic member, realizing the opening and closing of the port of the cylinder 20. During the exhaust stage, the pressure in the cylinder increases, pushing the cover plate 23 to slide to open the port, facilitating the discharge of impurities and gas; during the air intake stage, a negative pressure is formed in the cylinder, which cooperates with the first elastic member to make the cover plate 23 tightly adhere to the cylinder 20, ensuring the air extraction effect. This automatic adjustment sealing and exhaust mechanism improves the flexibility and reliability of the air extraction assembly.

[0058] In addition, during the exhaust process, the piston 21 will slide towards the cover plate 23, and in this process, the piston 21 can push the impurities adhering to the inner wall of the cylinder 20 to the end of the cylinder 20 close to the cover plate 23, and finally push these impurities out of the cylinder 20 from the end of the cylinder 20 close to the cover plate 23.

[0059] Reference Figure 2Specifically, the cylinder body 20 is provided with a plurality of sliding holes 26 near one end of the cover plate 23, the sliding holes 26 extend along the axis direction of the cylinder body 20, a sliding column 27 is arranged in the sliding hole 26, the sliding column 27 is fixedly connected to the cover plate 23 at the end away from the sliding hole 26, a first elastic member is arranged between the sliding column 27 and the cylinder body 20, and specifically, the first elastic member is a first spring 28, the first spring 28 is located in the sliding hole 26, one end of the first spring 28 is fixedly connected to the end of the sliding column 27 away from the cover plate 23, and the other end is fixedly connected to the bottom of the sliding hole 26.

[0060] Referring to Figure 2 Further, the cover plate 23 is embedded with a sealing ring 29 near the side close to the cylinder body 20, the sealing ring 29 surrounds the plurality of sliding holes 26, and the sealing ring 29 is in abutment with the end of the cylinder body 20 away from the cover plate 23.

[0061] Referring to Figure 2 Specifically, the first transmission assembly includes a mounting plate 30, a reciprocating screw rod 31, a sliding block 32 and a limiting rod 33, the mounting plate 30 is fixed to the ground or the treatment box 3, the motor 10 is mounted on the mounting plate 30, the reciprocating screw rod 31 is rotatably connected to the mounting plate 30 and is arranged along the axis direction of the second transmission wheel 12, and one end of the reciprocating screw rod 31 is fixedly connected to the second transmission wheel 12. The reciprocating screw rod 31 is located on the side of the cylinder body 20 away from the cover plate 23, the reciprocating screw rod 31 is consistent with the length direction of the cylinder body 20, the sliding block 32 is sleeved on the reciprocating screw rod 31 and is connected with the reciprocating screw rod 31, and the limiting rod 33 is inserted into the sliding block 32 and is consistent with the length direction of the reciprocating screw rod 31, and the sliding block 32 can slide along the length direction of the limiting rod 33. The sliding block 32 is fixedly connected to the end of the connecting rod 22 away from the piston 21.

[0062] The motor 10 drives the second transmission wheel 12 to rotate, the second transmission wheel 12 drives the reciprocating screw rod 31 to rotate, and the reciprocating screw rod 31 drives the sliding block 32 to slide back and forth along the length direction of the reciprocating screw rod 31, so that the connecting rod 22 moves back and forth along the length direction of the cylinder body 20.

[0063] Referring to Figure 4 In the embodiment, the filter screen 4 is provided with a vibration assembly for vibrating the filter screen 4.

[0064] In specific implementation: ①The vibration assembly vibrates the filter screen 4, the vibration of the filter screen 4 can shake off the impurities adhered to the filter screen 4, and the filtering effect of the filter screen 4 is improved.

[0065] ②, the filter screen 4 is vibrated by the vibration assembly, and the vibration is transmitted to the liquid surface layer, which destroys the structure of the surfactant molecules, reduces the surface tension of the liquid, and directly weakens the stability of the bubbles, so that the bubbles are more likely to be broken. For example, in the laboratory, an ultrasonic cleaner can make the tiny bubbles in the liquid break rapidly by vibration to achieve the purpose of defoaming. In addition, through continuous vibration, the bubbles accelerate and merge with each other, gradually growing into large bubbles with sufficient buoyancy. Finally, these large bubbles float to the surface of the liquid and break, releasing the trapped gas, which further reduces the measurement influence of the bubbles on the flowmeter body 1.

[0066] Referring to Figure 4 In the embodiment, the vibration assembly includes a rotating block 34, which is fixedly connected with the rotating shaft 7 and serves as a driving component for generating vibration. Through the interaction with the knocking rod 39, the rotating motion of the rotating shaft 7 is converted into the reciprocating motion of the knocking rod 39, and then the knocking vibration of the filter screen 4 is realized. The rotating block 34 has an inclined surface 35, a flat surface 36, and a vertical surface 37. The flat surface 36 is arranged between the inclined surface 35 and the vertical surface 37. The vertical surface 37, the flat surface 36, and the inclined surface 35 are sequentially arranged along the rotation direction of the rotating shaft 7. The flat surface 36 is parallel to the filter screen 4, and the vertical surface 37 is perpendicular to the filter screen 4. The inclined surface 35 provides a gradually rising transition surface for the knocking rod 39, so that the knocking rod 39 can smoothly move from the initial position to the flat surface 36. When the rotating block 34 rotates, the knocking rod 39 gradually rises along the inclined surface 35 away from one end of the mounting rod 38. The flat surface 36 serves as a transition and stable stage during the movement of the knocking rod 39, so that the knocking rod 39 maintains a relatively stable position on the flat surface 36, and prepares for the subsequent movement to the vertical surface 37 and knocking the filter screen 4. The vertical surface 37 cooperates with the second elastic member to enable the knocking rod 39 to move rapidly to the filter screen 4 when moving to the vertical surface 37, so as to realize the knocking of the filter screen 4. The vertical surface 37 is perpendicular to the filter screen 4. When the knocking rod 39 moves from the flat surface 36 to the vertical surface 37, the elastic potential energy accumulated by the second elastic member is released, pushing the knocking rod 39 to move rapidly to the filter screen 4 and generating the knocking force.

[0067] The processing cavity 5 is internally provided with a mounting rod 38 arranged along the length direction of the processing cavity 5, a knocking rod 39 is slidingly connected to the mounting rod 38 along the axial direction of the mounting rod 38, a second elastic element is arranged between the knocking rod 39 and the mounting rod 38, and the end of the knocking rod 39 away from the mounting rod 38 abuts against the filter screen 4. The knocking rod 39 serves as a component directly knocking the filter screen 4, and the elastic force of the second elastic element is transmitted to the filter screen 4 to make the filter screen 4 vibrate. The second elastic element stores and releases elastic potential energy, and provides power for the knocking rod 39 to knock the filter screen 4, so that the knocking rod 39 can quickly move towards the filter screen 4 when moving to the vertical surface 37. When the knocking rod 39 rises along the inclined surface 35, the second elastic element is compressed to store elastic potential energy, and when the knocking rod 39 moves to the vertical surface 37, the elastic potential energy of the second elastic element is released to push the knocking rod 39 to quickly move towards the filter screen 4 to generate a knocking force.

[0068] In specific implementation: ①, the rotating block 34 is fixedly connected with the rotating shaft 7, and the power source of the rotating shaft 7 in the system is ingeniously utilized, so that it is not necessary to additionally arrange a driving device to drive the vibration assembly to work, the system structure is simplified, and the energy consumption and cost are reduced.

[0069] ②, through the rotary motion of the rotating block 34, the rotary motion is ingeniously converted into the linear knocking motion of the knocking rod 39, and intermittent knocking of the filter screen 4 is realized. The intermittent knocking can make the filter screen 4 vibrate regularly, which can effectively remove impurities on the filter screen 4 and will not cause excessive impact force to the filter screen 4, so that damage of the filter screen 4 is avoided.

[0070] Referring to Figure 4 , specifically, the end of the knocking rod 39 close to the mounting rod 38 is provided with a sliding rod 40, the end of the sliding rod 40 away from the knocking rod 39 is inserted into the end of the mounting rod 38 close to the knocking rod 39, the sliding rod 40 is slidingly connected with the mounting rod 38, the second elastic element is a second spring 41, the second spring 41 is sleeved outside the sliding rod 40, and the two ends of the second spring 41 are fixedly connected with the mounting rod 38 and the knocking rod 39 respectively.

[0071] Referring to Figure 3 , in the embodiment, in order to control the pressure on the upper side of the processing cavity 5, so that the pressure on the upper side of the processing cavity 5 does not exceed the rated negative pressure value, a pressure control structure is arranged on the top of the processing box 3. The pressure control structure controls the pressure on the upper side of the processing cavity 5 in a suitable range, and then controls the liquid level of the liquid in the processing cavity 5 below the rotating shaft 7.

[0072] Specifically, the pressure control structure comprises a mounting seat 42, which is a hollow cylindrical structure. The mounting seat 42 is vertically installed on the top of the processing box 3. The bottom of the mounting seat 42 is provided with an opening communicating with the inside of the mounting seat 42. The lower end of the mounting seat 42 is located in the processing cavity 5. The processing cavity 5 communicates with the inside of the mounting seat 42 through the opening. The inside of the mounting seat 42 is provided with an adjusting pipe 43 with an open bottom and a closed top. The adjusting pipe 43 is in sliding sealing connection with the mounting seat 42. The third spring 44 is arranged between the adjusting pipe 43 and the mounting seat 42. The third spring 44 is located below the adjusting pipe 43. One end of the third spring 44 is fixedly connected with the lower end of the adjusting pipe 43, and the other end is fixedly connected with the mounting seat 42. A third through hole is formed in the outer side wall of the mounting seat 42 and communicates with the inside of the mounting seat 42. A fourth through hole is formed in the side wall of the adjusting pipe 43. When the third spring 44 is in a natural state, the adjusting pipe 43 closes the third through hole. When the pressure on the upper side of the processing cavity 5 decreases, the adjusting pipe 43 moves downward. When the pressure in the processing cavity 5 decreases to a rated value, the adjusting pipe 43 moves downward to make the third through hole and the fourth through hole coincide. After the coincidence, external gas enters the processing cavity 5. The adjusting pipe 43 moves upward, and the processing cavity 5 is resealed, thereby controlling the pressure in the processing cavity 5.

[0073] It should be understood that the above embodiments are only to illustrate the technical concepts and characteristics of the present application, and the purpose is to enable those skilled in the art to understand the content of the present application and implement it, and the specific implementation of the present application cannot be limited to these descriptions. For ordinary skilled persons in the art, without departing from the concept of the present application, some simple deductions or substitutions can be made, and any equivalent changes or modifications made according to the spirit and essence of the present application should be covered within the protection scope of the present application.

Claims

1. An electromagnetic flowmeter comprising a flowmeter body having a liquid inlet end, characterised in that, Also include: The processing box has a cylindrical processing cavity inside, the processing cavity is horizontally arranged, the lower part of both ends of the processing cavity is respectively communicated with the liquid inlet and the liquid outlet, the liquid outlet is communicated with the liquid inlet end of the flowmeter body; The air extraction assembly has an air extraction port, which is communicated with the top of the processing cavity; The filter screen is vertically arranged in the processing cavity, and the filter screen is rotationally connected with the processing box; The driving assembly is used for driving the filter screen to rotate; The first transmission assembly is arranged between the filter screen and the air extraction assembly, and the rotation of the filter screen can drive the air extraction assembly to work.

2. An electromagnetic flowmeter according to claim 1, characterised in that: The processing cavity is provided with an annular groove coaxially arranged with the processing cavity, the filter screen is located in the annular groove, the outer edge of the filter screen abuts against the bottom of the annular groove, the thickness of the filter screen is smaller than the thickness of the annular groove, and the filter screen abuts against the side of the annular groove close to the flowmeter body; The filter screen is provided with a rotating shaft at the center position, the rotating shaft is rotationally connected with the processing box, the rotating shaft is coaxially arranged with the processing cavity, and the driving assembly is used for driving the rotating shaft to rotate; The side of the filter screen away from the flowmeter body is provided with a collecting plate, the collecting plate is located in the annular groove, and the rotation of the filter screen can drive the collecting plate to rotate; The processing cavity is provided with a collecting box inside, the collecting box is a hollow structure with an open top, the collecting box is horizontally arranged, the collecting box is located above the rotating shaft, the rotation of the filter screen can drive the collecting plate to rotate, the rotation of the collecting plate can drive the impurities located in the annular groove to move upward along with the collecting plate, and when the impurities are at a certain height, the impurities fall into the collecting box along the collecting plate under the action of gravity.

3. An electromagnetic flowmeter according to claim 2, wherein: The collecting box is rotationally connected with a spiral conveying member, the spiral conveying member is arranged along the direction perpendicular to the axis of the processing cavity, one end of the spiral conveying member is provided with a connecting pipe, one end of the connecting pipe is communicated with the air extraction port of the air extraction assembly, and the other end of the connecting pipe is communicated with the inside of the collecting box; The spiral conveying member and the rotating shaft are provided with a second transmission assembly, and the rotation of the rotating shaft can drive the spiral conveying member to rotate to convey the impurities located in the collecting box to one side of the connecting pipe through the second transmission assembly.

4. An electromagnetic flowmeter according to claim 3, wherein: The collecting box is provided with a slope portion, the slope portion is arranged upwardly inclined to the side close to the filter screen, and the spiral conveying member is located at the side of the slope portion away from the filter screen.

5. An electromagnetic flowmeter according to claim 4, characterised in that: The side of the slope portion close to the filter screen abuts against the filter screen.

6. An electromagnetic flowmeter according to claim 5, characterised in that: The air extraction assembly includes a cylinder, the cylinder is a hollow cylindrical structure with open ends, the cylinder is provided with a piston inside, the piston is slidingly and sealingly connected with the cylinder along the length direction of the cylinder, the cylinder is provided with a connecting rod inside, one end of the connecting rod is fixedly connected with the piston, the other end of the connecting rod extends out of the cylinder along one end of the cylinder and is transmissionally connected with the first transmission assembly, and the rotation of the rotating shaft can drive the connecting rod to slide along the axis direction of the cylinder to drive the piston to slide along the axis direction of the cylinder through the first transmission assembly; The side of the cylinder away from the connecting rod is provided with a cover plate, the cover plate is used for sealing the side of the cylinder away from the connecting rod, the cover plate is slidingly connected with the cylinder along the length direction of the cylinder, a first elastic member is arranged between the cover plate and the cylinder, and when the first elastic member is in a natural state, the cover plate sealingly abuts against the cylinder. The flow guide pipe is communicated with one end of the connecting pipe far from the collecting box and extends into the cylinder through the cover plate.

7. A flow meter according to any one of claims 2 to 6, wherein: The filter screen is provided with a vibration assembly for vibrating the filter screen.

8. An electromagnetic flowmeter according to claim 7, characterised in that: The vibration assembly comprises a rotating block fixedly connected with the rotating shaft, the rotating block has an inclined surface, a flat surface and a vertical surface, the flat surface is arranged between the inclined surface and the vertical surface, the vertical surface, the flat surface and the inclined surface are sequentially arranged along the rotating direction of the rotating shaft, the flat surface is parallel to the filter screen, and the vertical surface is perpendicular to the filter screen. The processing cavity is internally provided with a mounting rod arranged along the length direction of the processing cavity, a knocking rod is slidably connected with the mounting rod along the axial direction of the mounting rod, a second elastic member is arranged between the knocking rod and the mounting rod, and one end of the knocking rod far from the mounting rod abuts against the filter screen.

9. An electromagnetic flowmeter according to claim 1 wherein: The processing box is provided with a pressure control structure on the top.

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