A movable electromagnetic flowmeter for measuring the flow rate of non-full pipe flow of drainage

Abstract

The present invention discloses a movable electromagnetic flowmeter for measuring the flow rate of a non-full pipe flow of drainage. The electromagnetic flowmeter comprises a circulation pipe and an excitation coil and an induction electrode arranged outside the circulation pipe; wherein one end of the circulation pipe is connected to a water tank, and the other end is connected to a water outlet pipe, and the vertical height of the location of the water outlet pipe is higher than the vertical height of the location of the circulation pipe, that is, the water in the water tank will overflow from the water outlet pipe only after filling the circulation pipe, thereby starting to flow. In this process, the induction electrode can sense the induced electromotive force generated by the current cutting the magnetic flux, thereby obtaining the flow rate in the full pipe flow state, so that the flow rate of drainage in the non-full pipe flow state can be accurately obtained by using the device and utilizing the principle of the electromagnetic flowmeter.

Description

Technical Field

[0001] The invention relates to an electromagnetic flowmeter, in particular to an electromagnetic flowmeter capable of measuring in a non-full pipe condition. Background Art

[0002] Generally, drainage pipes are not full pipe flow, and there are many ways to measure the flow rate. For example, the triangular weir measurement method can be used, but this method will cause siltation; Venturi measurement can be used, but the measurement result is not accurate enough; ultrasonic Doppler flowmeter can be used for measurement, but when measuring fluids such as rainwater drainage, the sensor is easily contaminated; laser or radar can also be used for measurement, but the result is still not accurate enough. At present, the most accurate measurement method is electromagnetic flow measurement, but this method in the prior art is only applicable to full pipe flow.

[0003] Although some solutions in the prior art attempt to use electromagnetic flowmeters to measure fluids in partially full pipes, the results are not ideal. For example, the electromagnetic flowmeter described in the patent document with patent number CN200910236290.9, which is titled "An electromagnetic flowmeter that can be used for partially full pipe flow measurement", adds relevant sensors to an ordinary electromagnetic flowmeter and obtains the final measurement result through algorithm calculation. However, the overall structure is too complicated, the cost is high, and the accuracy of the final measurement result is not high enough.

[0004] Another existing technical solution is to add a liquid level detection device to the existing ordinary full-tube electromagnetic flowmeter, so as to calculate the fluid cross section in real time. This method has a large height detection error, and the final result can only be used for reference with low accuracy.

[0005] There are also existing technical solutions, such as the electromagnetic flowmeter recorded in the patent document with patent number 201010557200.9, which is named as a non-full pipe electromagnetic flowmeter. The flow rate when the pipe is full is obtained by reducing the flow area of ​​the flow channel. However, the solution is not adaptable to the flow change in the flow channel. For fluids with large flow changes, the measurement accuracy is very low, and when the flow is particularly small, the measurement ability is basically lost.

[0006] For the above reasons, the inventors have conducted in-depth research on existing electromagnetic flowmeters in the hope of designing an electromagnetic flowmeter that can solve the above problems, that is, it can provide accurate flow measurement information, adapt to different flow changes, and be as simple as possible for easy maintenance and replacement. Summary of the invention

[0007] In order to overcome the above problems, the inventors have conducted intensive research and designed a movable electromagnetic flowmeter for measuring the flow rate of non-full pipe flow of drainage, the electromagnetic flowmeter includes a circulation pipe and an excitation coil and an induction electrode arranged outside the circulation pipe; wherein, one end of the circulation pipe is connected to a water tank, and the other end is connected to a water outlet, the vertical height of the location of the water outlet is higher than the vertical height of the location of the circulation pipe, that is, the water in the water tank will overflow from the water outlet only after filling the circulation pipe, thereby starting to flow, during which the induction electrode can sense the induced electromotive force generated by the current cutting the magnetic flux lines, thereby obtaining the flow rate in the full pipe flow state, so that through the device, the flow rate when the drainage pipe is not full can be accurately obtained by using the principle of the electromagnetic flowmeter, thereby completing the present invention.

[0008] Specifically, the object of the present invention is to provide a movable electromagnetic flowmeter for measuring the flow rate of a non-full pipe flow of drainage, the electromagnetic flowmeter comprising a flow pipe 1 and an excitation coil 2 and an induction electrode 3 arranged outside the flow pipe 1;

[0009] One end of the circulation pipe 1 is connected to the water tank 4, and the other end is connected to the water outlet 5.

[0010] The vertical height of the water outlet pipe 5 is higher than the vertical height of the flow pipe 1 , that is, the water in the water tank 4 will overflow from the water outlet pipe 5 only after the flow pipe 1 is fully filled.

[0011] The flow meter further comprises a holding tank 6, in which the flow pipe 1, the water outlet 5 and the water tank 4 are all arranged.

[0012] A water inlet 61 and a water outlet 62 are provided on the side wall of the holding tank 6.

[0013] The water inlet 61 is connected to the drain pipe 7 to be measured.

[0014] The water outlet 62 is located at the lower side of the holding tank 6.

[0015] The water overflowing from the water outlet pipe 5 gathers at the bottom of the holding tank 6 and flows out from the water outlet 62 .

[0016] A water tank inlet 41 and a water tank outlet 42 are provided on the side wall of the water tank 4, wherein the water tank inlet 41 is connected to the water inlet 61 and the drain pipe 7; the water tank outlet 42 is connected to the flow pipe 1, so that the water in the drain pipe 7 can enter the flow pipe 1 after passing through the water tank 4.

[0017] The cross-sectional dimension of the water tank water inlet 41 is larger than the cross-sectional dimension of the water inlet 61 .

[0018] The water tank 4 is a box body with closed sides and bottom and open top.

[0019] The vertical height of the top opening of the water tank 4 is higher than the vertical height of the water outlet pipe 5, so that the water in the water tank can overflow from the water outlet pipe 5 after passing through the circulation pipe 1 in the form of full pipe flow under the action of water pressure.

[0020] A sealing ring 8 is provided around the water inlet 61 between the water tank 4 and the receiving tank 6 , so that the water in the drain pipe 7 directly enters the water tank 4 without leaking out of the water tank 4 .

[0021] The flow pipe 1 , the excitation coil 2 , the induction electrode 3 and the water tank 4 are fixedly connected as a whole to form a measurement system, and the measurement system is detachably installed in the holding tank 6 .

[0022] A supporting seat 63 for supporting the water tank 4 is provided at the bottom of the receiving tank 6 . After the water tank 4 is placed on the supporting seat 63 , it can slide back and forth in the horizontal direction, so as to approach or move away from the drain pipe 7 .

[0023] A fixing frame 64 is provided in the containing tank 6 , and screwing screws 65 are provided on the fixing frame 64 . The screwing screws 65 are used to tighten the water tank 4 , so that the water tank 4 and the inner wall of the containing tank 6 clamp the sealing ring 8 together.

[0024] A gasket 44 is provided on the water tank 4 to abut against the screw 65 .

[0025] The beneficial effects of the present invention include:

[0026] (1) The movable electromagnetic flowmeter for measuring the flow rate of non-full pipe flow of drainage provided by the present invention cleverly utilizes the height difference of the liquid level to keep the flow path passing through the excitation coil and the induction electrode full pipe flow, thereby being able to accurately obtain the flow value;

[0027] (2) The movable electromagnetic flowmeter for measuring the flow rate of a non-full pipe drainage provided by the present invention can adapt to flow measurement under different flow rates / flow rates. Even if the flow rate and flow rate in the drainage pipe change in real time, it can continuously obtain accurate flow values ​​without being affected by the changing flow rate and flow rate.

[0028] (3) The movable electromagnetic flowmeter for measuring the flow rate of a non-full pipe of drainage provided by the present invention is opened at the top of the water tank, and the water outlet is also connected to the outside atmosphere, thereby ensuring that the air carried in the drainage pipe can be discharged in time, and the air basically does not enter the circulation pipe, preventing the air from interfering with the measurement results;

[0029] This structure can also ensure that when the water flow in the drain pipe surges, the water can be discharged out of the circulation pipe in time to reduce the pressure in the drain pipe;

[0030] This structure can also ensure that the entire water flow pipeline is unobstructed in the event of an accident. For example, when the circulation pipeline and the water outlet are blocked, the water flow in the drain pipe can directly enter the holding tank and be discharged from the water outlet of the holding tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 A schematic diagram of the overall structure of a movable electromagnetic flowmeter for measuring a non-full pipe flow of drainage according to a preferred embodiment of the present invention is shown;

[0032] Figure 2 A schematic diagram showing the structure of a movable electromagnetic flowmeter for measuring a non-full pipe flow of drainage according to a preferred embodiment of the present invention, in which a measuring system is detachably installed in a containing tank;

[0033] Figure 3 A schematic diagram of the structure of the support seat and the positioning protrusion when the measuring system is detachably installed in the containing tank in a movable electromagnetic flowmeter for measuring the flow rate of a partially full pipe of drainage according to a preferred embodiment of the present invention is shown;

[0034] Figure 4 A schematic cross-sectional view of the overall structure at the drain pipe when the measuring system of the movable electromagnetic flowmeter for measuring the flow rate of a partially full pipe drainage according to a preferred embodiment of the present invention is detachably installed in the containing tank;

[0035] Figure 5 A schematic diagram showing the overall structure of the holding tank when the flow pipe is short in a movable electromagnetic flowmeter for measuring the flow of a non-full pipe flow of drainage according to a preferred embodiment of the present invention

[0036] Figure 6 A partial enlarged view showing the position of a metal plate in a movable electromagnetic flowmeter for measuring a non-full pipe flow of drainage according to a preferred embodiment of the present invention;

[0037] Figure 7 A schematic diagram of a metal plate structure for measuring a non-full pipe flow rate of drainage according to a preferred embodiment of the present invention is shown;

[0038] Figure 8 A schematic structural diagram showing a method for measuring the flow rate of a partially full pipe flow when a front nut is screwed onto a bolt according to a preferred embodiment of the present invention;

[0039] Fig. 9A schematic structural diagram showing a gasket installed on a bolt in a drainage non-full pipe flow metering method according to a preferred embodiment of the present invention;

[0040] Fig.10 A schematic diagram showing the structure of a method for measuring the flow rate of a non-full pipe flow for drainage according to a preferred embodiment of the present invention when the rear nut is screwed and pressed against the metal plate;

[0041] Fig.11 A schematic structural diagram is shown in which a measuring system for measuring the flow rate of a partially full pipe flow of drainage according to a preferred embodiment of the present invention is integrated with a part of a water tank.

[0042] Description of Figure Numbers:

[0043] 1- circulation pipe 2- excitation coil 3- induction electrode 4- water tank 41- water tank water inlet 42- water tank water outlet 43- positioning protrusion 44- gasket 45- emergency overflow pipe 46- shell 47- baffle 471- chute 5- outlet pipe 6- holding tank 61- water inlet 62- outlet 63- support seat 64- fixing frame 65- screw screw

[0044] 7-drain pipe 8-seal ring 91-flange 92-valve 93-ladder

[0045] 94-Metal plate 95-Semicircular slot 96-Bolt 97-Front nut 98-Rear nut 99-Gasket DETAILED DESCRIPTION

[0046] The present invention will be further described in detail below through the accompanying drawings and embodiments. Through these descriptions, the characteristics and advantages of the present invention will become more clear and distinct.

[0047] The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration." Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. Although various aspects of the embodiments are shown in the drawings, the drawings are not necessarily drawn to scale unless otherwise noted.

[0048] The full pipe flow described in the present invention is a kind of pressure flow, which is the flow of liquid with surrounding constraints and no free surface (interface between liquid and gas); that is, the flow of liquid filling the pipe.

[0049] The partially filled pipe flow refers to the flow in which the liquid fails to fill the pipe.

[0050] The electromagnetic flowmeter is an instrument that measures the flow rate of a conductive fluid based on the electromotive force induced when the conductive fluid passes through an external magnetic field. The conductive fluid flows in a fixed pipe, and the cross-sectional area and diameter of the pipe can be known. A uniform DC or AC magnetic field is applied around the pipe, and the induced potential signal is measured through electrodes. The flow rate is calculated by the following formula:

[0051]

[0052] Where Q represents the flow rate, k is the correction coefficient, which is generally fixed according to the actual situation, such as 0.8; U represents the voltage value measured by the electrode, A represents the cross-sectional area of ​​the pipeline, d represents the pipeline diameter, and B represents the magnetic field strength, so that the flow value can be obtained. Since the calculation process involves the cross-sectional area of ​​the pipeline, the calculation result can only be stable and accurate when the pipeline is full of flow.

[0053] According to the present invention, a movable electromagnetic flowmeter for measuring the flow rate of a non-full pipe flow of drainage is provided. Figure 1 As shown in , the electromagnetic flowmeter includes a flow pipe 1 and an excitation coil 2 and an induction electrode 3 arranged outside the flow pipe 1;

[0054] One end of the flow pipe 1 is connected to the water tank 4, and the other end is connected to the water outlet 5.

[0055] The vertical height of the water outlet pipe 5 is higher than the vertical height of the flow pipe 1 , that is, the water in the water tank 4 will overflow from the water outlet pipe 5 only after the flow pipe 1 is fully filled.

[0056] The vertical height of the water outlet 5 refers to the lowest height position where liquid can flow out of the water outlet 5. The water outlet 5 is preferably a flat annular structure as a whole, and water overflowing from the water outlet 5 can flow out of the water outlet 5 from all directions, so that the water flow is smooth and the stability of the liquid flow in the circulation pipe 1 is prevented from being affected.

[0057] The vertical height of the location of the circulation pipeline 1 refers to the height of the highest point of the inner wall of the circulation pipeline 1 .

[0058] The higher the vertical height of the water outlet pipe 5, the more it can ensure that the fluid in the circulation pipe 1 is in a full pipe state. However, it will also increase a lot of unnecessary waste. The water can only overflow from the water outlet pipe 5 when the liquid level in the water tank and the drain pipe is high enough. If the vertical height of the water outlet pipe 5 is set too low, it is possible that the vertical height of the water outlet pipe 5 is lower than the maximum height inside the circulation pipe 1 due to factors such as installation accuracy and flatness of the installation position, thereby causing some areas in the circulation pipe 1 to not be fully filled. On this basis, in the present application, preferably, the vertical height of the water outlet pipe 5 is 3 to 5 cm higher than the vertical height of the circulation pipe 1, thereby ensuring that the circulation pipe 1 is kept in a full pipe state and increasing the height of the water outlet pipe 5 as little as possible, thereby reducing the overall burden of the electromagnetic flowmeter.

[0059] When water overflows from the water outlet pipe 5, since the position of the water outlet pipe 5 is higher than the height of the circulation pipe 1, the circulation pipe 1 must be filled with water at this time. As the water overflows from the water outlet pipe 5, the water in the circulation pipe 1 naturally needs to be replenished into the water outlet pipe 5, forming a water flow channel inside the circulation pipe 1. Therefore, the sensing electrode can sense the potential difference at this time, thereby being able to know the flow rate flowing through the circulation pipe 1 at this time, and the flow rate is consistent with the amount of water overflowing from the water outlet pipe 5, and is also consistent with the amount of water injected into the drain pipe 7.

[0060] The electromagnetic flowmeter described in the present application is used to measure the flow rate in drainage pipes when storing and treating water bodies such as rainwater. Due to the periodicity and uncertainty of rainwater volume, it is uncertain whether the water in the pipe is full. Therefore, during the use of the above-mentioned electromagnetic flowmeter in the present application, there is no need to consider whether the water in the drainage pipe is full, and the accurate flow value can be obtained by direct application.

[0061] The excitation coil 2 includes an upper excitation coil located above the outside of the flow pipe 1 and a lower excitation coil located below the flow pipe 1. The excitation coil 2 generates an alternating magnetic field through the excitation of a 50HZ industrial frequency power supply, and the electromagnetic flowmeter itself knows the strength of the alternating magnetic field. The excitation coil 2 can be selected from existing excitation coils in the art, and this application does not specifically limit this;

[0062] The sensing electrode 3 is used to extract the measured induced potential signal. The sensing electrode 3 is generally made of non-magnetic stainless steel and is flush with the inner wall of the flow pipe so that the fluid can pass through without obstruction. The installation position of the sensing electrode 3 is set in the vertical direction of the flow pipe to prevent sediment from accumulating on it and affecting the measurement accuracy. The sensing electrode 3 can be selected from existing electrodes in the art, and this is not particularly limited in this application;

[0063] The circulation pipe 1, especially the part of the pipe located on the inner side of the excitation coil 2, is made of a material that is non-magnetic, has low electrical conductivity, low thermal conductivity and has a certain mechanical strength. It can be made of non-magnetic stainless steel, fiberglass, high-strength plastic, aluminum, etc., and fiberglass is preferably selected for preparation in this application; the circulation pipe 1 and the water outlet pipe can be formed as one piece of pipe, or can be formed by two or more pipes sealed and spliced ​​to each other, and the splicing position can be fixed and sealed in the form of a flange.

[0064] In a preferred embodiment, an emergency overflow pipe 45 is provided on the wall of the water tank 4 where the circulation pipe 1 is opened. The height of the emergency overflow pipe 45 is higher than the outlet height of the water outlet pipe 5, so that the liquid in the water tank 4 is basically discharged through the circulation pipe 1. When an unexpected situation occurs, such as blockage of the circulation pipe 1 or a sudden increase in the flow in the drain pipe 7, the liquid level in the water tank 4 rises, so that excess water in the water tank 4 can flow into the holding tank 6 through the emergency overflow pipe 45. Although this will cause the electromagnetic flowmeter to be unable to accurately measure the flow value, it can ensure that the overall water flow is smooth and will not cause accidents.

[0065] The water outlet pipe 5 can be connected to the downstream water pipe to conduct the water in the drain pipe 7 to the downstream water pipe. The water flow has completed the flow metering work when flowing through the circulation pipe 1. In principle, the water outlet pipe 5 can be connected to the downstream water pipe by all known schemes. However, since the water flow injected into the drain pipe 7 can be variable, the water flow at the water outlet pipe 5 may also change in real time, which will bring a constantly changing water flow pressure to the downstream water pipe. In addition, when the downstream water pipe is sealed and connected to the water outlet pipe, the pressure inside the sealed cavity is unstable, which is very likely to cause pressure imbalance on both sides of the circulation pipe 1, and the liquid in the circulation pipe 1 cannot flow out stably from the water outlet pipe 5; on this basis, in the present application, the water outlet pipe 5 is set as an open pipe, which is not in direct contact with other devices and is connected to the external atmospheric pressure.

[0066] Based on the above problems, in a preferred embodiment, Figure 1 As shown in , the flow meter further includes a holding tank 6, in which the flow pipe 1, the water outlet 5 and the water tank 4 are all arranged.

[0067] A water inlet 61 and a water outlet 62 are provided on the side wall of the holding tank 6.

[0068] The water inlet 61 is connected to the drain pipe 7 to be measured.

[0069] The water outlet 62 is located at the lower side of the holding tank 6.

[0070] The water overflowing from the water outlet pipe 5 gathers at the bottom of the holding tank 6 and flows out from the water outlet 62. The water outlet 62 is located below the water outlet pipe 5, and the water outlet 62 is connected to the downstream pipeline.

[0071] The holding tank 6 can be buried under the ground. The holding tank 6 can be made relatively large. At least workers can go down to the bottom of the holding tank 6 through the ladder installed on it and replace the flow pipe 1, the excitation coil 2, the induction electrode 3 and other related devices located at the bottom of the holding tank. When the flow pipe 1, the excitation coil 2 and the induction electrode 3 are not installed in the holding tank 6, the holding tank 6 can be used as a water storage tank. Preferably, Figure 5 As shown in FIG, when the holding tank 6 is used as a water storage tank, valves 92 are provided on the water inlet pipe and the water outlet pipe thereof to control the amount of water in the holding tank.

[0072] The holding tank 6 can be a self-designed and processed tank body, or it can be an existing water storage tank body; when the holding tank 6 is an existing tank body, it is only necessary to add the flow pipe 1, the excitation coil 2, the induction electrode 3, the water tank and other components therein, and to seal and fix the water inlet pipe of the existing tank body to the water inlet 41 of the water tank.

[0073] The top of the holding tank 6 is open, and the opening needs to be large enough to facilitate workers and related equipment to enter and exit conveniently, and at least needs to be able to meet the operational requirements of replacing and repairing the flow pipe 1, the excitation coil 2, the induction electrode 3 and the water tank 4.

[0074] like Figure 5 As shown in , a ladder 93 connected to the inner bottom surface is provided at the opening position of the storage tank 6 to facilitate the user to enter the storage tank 6 from the outside.

[0075] The length of the flow pipe 1 is not particularly limited, and can be designed based on factors such as the internal space size of the container 6, the measurement accuracy requirements, and whether the flow pipe 1 needs to be frequently taken out of the container 6. Figure 5 A flow channel with a shorter length dimension is shown in FIG. Figure 1 , Figure 2 A larger length of the flow pipe is shown in FIG. No matter how the length of the flow pipe 1 is selected, it is necessary to ensure that the pipe section at the excitation coil 2 is a straight pipe section with a uniform inner diameter.

[0076] When the flow pipe 1 is shorter, its volume is small, its gravity is light, and it is easier to disassemble and replace. It also occupies less space inside the holding tank, so a smaller holding tank can be selected. However, the liquid flow has almost no smooth flow section before entering the magnetic field area, so the measurement accuracy is relatively low.

[0077] In the present application, the length of the circulation pipe 1 is preferably designed to be smaller, and the total length of the straight pipe section is 500-700 mm, which is slightly larger than the length of the excitation coil 2 to facilitate maintenance and replacement. The flow pipe 1 can easily enter and exit the holding tank 6 multiple times.

[0078] When the holding tank 6 is a metal tank body, the water inlet 61 and the drain pipe 7 to be measured can be fixedly connected as an integral structure, such as by welding, or can be formed by integral casting; thereby ensuring that the water coming out of the drain pipe 7 will not flow out of the holding tank 6, ensuring the accuracy of flow measurement, and avoiding waste of water resources.

[0079] When the holding tank 6 is a concrete structure, Figure 6 As shown in the figure, the inner wall surface of the holding tank 6 is not flat and smooth, and it is difficult to directly seal and connect it with the water tank through the sealing ring; a metal plate 94 is provided on the inner wall of the holding tank 6, preferably made of stainless steel, and a through hole is opened in the middle of the metal plate, the position of the through hole is opposite to the drain pipe 7, and the drain pipe 7 can pass through the through hole after being extended, and the through hole can allow the water flow in the drain pipe 7 to pass through the metal plate 94; the metal plate is fixedly mounted on the inner wall of the holding tank 6, and is an integral structure with the holding tank 6. The side of the metal plate facing the water tank is a plane, and the sealing ring 8 is arranged between the metal plate and the water tank, so that the water tank 4 and the metal plate 94 can be sealed and connected through the sealing ring;

[0080] The metal plate is fixedly connected to the inner wall of the holding tank 6 , and the gap between the metal plate and the holding tank 6 can be filled with a water-swellable rubber pad, thereby ensuring that the water in the drain pipe 7 can flow into the water tank 4 .

[0081] The water-swellable rubber pad can expand and deform by at least 2-3 times after contacting water, and fill all irregular surfaces, cavities and gaps of the joint, while generating huge contact pressure, completely preventing leakage, and having a certain connection strength. The water-swellable rubber pad can be prepared by using a putty-type water-swellable waterstop strip available in the prior art.

[0082] Preferably, the position of the water inlet 61 is higher than the position of the water outlet 62. More preferably, the water inlet 61 and the water outlet 62 are arranged opposite to each other, and the distance between them is as far as possible.

[0083] Preferably, the height of the water inlet 61 is higher than or equal to the height of the water outlet pipe 5, thereby ensuring that, when the drain pipe is not full, the liquid level at the water inlet 61 is higher than the liquid level at the water outlet pipe 5, thereby forcing the water in the circulation pipe 1 to flow toward the water outlet pipe 5.

[0084] In a preferred embodiment, Figure 1As shown in , a water tank water inlet 41 and a water tank water outlet 42 are provided on the side wall of the water tank 4, wherein the water tank water inlet 41 is connected to the water inlet 61 and the drain pipe 7;

[0085] The water tank water outlet 42 is communicated with the circulation pipe 1 , so that the water in the drain pipe 7 can enter the circulation pipe 1 after passing through the water tank 4 .

[0086] Preferably, the water tank outlet 42 is fixedly connected to the flow pipe 1, so that the water tank and the flow pipe 1 are connected as one, and can be disassembled and installed together, and can be fixed by welding or other methods;

[0087] like Figure 5 As shown in the figure, a section of pipe is connected to the water outlet 42 of the water tank, and the pipe is connected to the circulation pipe 1 through a flange 91. Sealing gaskets, water stop strips, etc. are arranged between the flanges to ensure the sealing performance after the flange connection. By setting the flange 91, the water tank 4 and the circulation pipe 1 are detachably installed. When only the circulation pipe 1 and the components such as the excitation coil 2 and the induction electrode 3 thereon need to be inspected and replaced, only the flange can be disassembled to separate the circulation pipe 1 from the water tank 4, thereby simplifying the disassembly process and improving the inspection and maintenance efficiency.

[0088] The water tank is a metal box with a closed side wall. Through holes are provided on the closed side wall, namely, the water inlet 41 and the water outlet 42 of the water tank. The bottom of the water tank is sealed and fixedly connected to the side wall as a whole. The top of the water tank is open and no baffle is required. The side wall of the water tank is relatively high so that the water tank can hold a sufficient amount of water. The water in the water tank is not easy to overflow from the top, so that the water in the water tank is pressed into the circulation pipe 1.

[0089] Preferably, the vertical height of the top opening of the water tank 4 is higher than the vertical height of the water outlet pipe 5, so that the water in the water tank can overflow from the water outlet pipe 5 after passing through the circulation pipe 1 in the form of full pipe flow under the action of water pressure;

[0090] The height difference between the highest water level in the water tank and the highest water level in the circulation pipe 1 is a set value, which is more than 4 times the inner diameter of the circulation pipe 1, thereby ensuring that the liquid in the circulation pipe 1 has a sufficiently large pressure difference and ensuring that all the water in the water tank can be pressed into the circulation pipe 1.

[0091] The volume of the water tank is generally large, and it is difficult for at least one or two workers to move the water tank without the help of a mechanical lever. In addition, the sealing ring, water tank water inlet and other structures are close to the inner wall surface of the holding tank during the installation process. Therefore, during the actual installation of the water tank, it is difficult for workers to visually observe whether the water tank water inlet on the water tank is in a positional relationship with the water inlet 61 on the holding tank 6. By judging through other reference systems, the basic approximate range can be determined, but it is still difficult to ensure accurate installation accuracy. Once the water inlet 61 is misaligned with the water tank water inlet, the passage for liquid circulation may be blocked or partially blocked, affecting the subsequent use effect;

[0092] Based on the above problems, in a preferred embodiment, the cross-sectional size of the water tank water inlet 41 is larger than the cross-sectional size of the water inlet 61, so that when the water tank is not fully aligned with the holding tank 6, basic pipeline circulation can still be ensured to ensure that the water in the drain pipe 7 can enter the water tank 4.

[0093] Preferably, the water tank inlet 41 and the water inlet 61 are both circular holes. In this case, the diameter of the water tank inlet 41 is 8 to 10 cm larger than the diameter of the water inlet 61. This allows a deviation of 4 to 5 cm between the water tank and the predetermined position during installation. The operating difficulty and precision requirements of the workers can be greatly reduced, and it is easy to meet actual use requirements.

[0094] In a preferred embodiment, a sealing ring 8 is provided around the water inlet 61 between the water tank 4 and the receiving tank 6 , so that the water in the drain pipe 7 directly enters the water tank 4 without leaking out of the water tank 4 .

[0095] The sealing ring is preferably an annular rubber sealing ring. More preferably, a plurality of sealing rings are provided, which are of different sizes and are sleeved together and surround the water inlet 61, so as to further ensure the sealing performance between the water tank 4 and the holding tank 6.

[0096] Preferably, the sealing ring is installed on the water tank 4; when the water tank is disassembled, the sealing ring can be moved and disassembled together with the water tank.

[0097] More preferably, an annular groove is opened on the outer wall surface of the water tank 4 around the water inlet 41 of the water tank, and the number of the grooves is consistent with the number of sealing rings; the sealing ring is embedded in the groove, so that the sealing ring can move with the water tank, so that when the water tank is close to the receiving tank 6, the water tank and the receiving tank 6 clamp the sealing ring together, and as the sealing ring is clamped and deformed, the gap between the water tank and the receiving tank is filled with the sealing ring, thereby preventing water from flowing through and forming a seal.

[0098] The holding tank 6 can be made of metal materials throughout, such as stainless steel. When the holding tank 6 is made of metal materials, the related components fixed to the side wall or bottom of the holding tank 6 can be welded and fixed to the holding tank; the related components in this application include one or more of a metal plate, a supporting seat and a fixing frame. When the holding tank 6 is made of metal materials, the metal plate can be installed or not.

[0099] The containing tank 6 may also be made of concrete material. In this case, the containing tank 6 cannot be directly welded and fixed to the relevant devices inside it. It can be fixed by pre-embedding a connecting joint in the containing tank 6, that is, pre-embedding a metal joint at a specific position on the inner wall of the containing tank 6, so that the metal joint can be welded or screwed to the relevant devices.

[0100] When the containing tank 6 is an existing tank body, after drilling holes on the inner wall of the containing tank 6, expansion nails or expansion bolts are added to fix the containing tank 6 with the related components by welding or screwing.

[0101] In order to reduce production costs and make the best use of existing resources and facilities, it is preferred in this application that the holding tank is an existing tank body and a tank body made of concrete material. Compared with metal tank bodies, concrete tank bodies have lower production costs, stronger corrosion resistance, and longer service life. In addition, the concrete tank body can be cast on site, and its transportation and installation will be simpler and more convenient.

[0102] Preferably, the holding tank is in the form of a square tank body as a whole, that is, its internal cross-section is rectangular, so each inner wall surface of the holding tank body is a planar structure, and correspondingly, the metal plate installed on the inner wall surface is a flat plate.

[0103] Preferably, if Figure 7 , Figure 8 , Fig. 9 and Fig.10 As shown in , when the containing tank is an existing tank body, especially when the inner wall surface near the water inlet of the existing tank body is uneven, a plurality of semicircular grooves 95 are opened around the metal plate, and the semicircular grooves 95 are evenly distributed on the top, bottom, left side and right side of the metal plate;

[0104] A bolt 96 is provided at each semicircular groove 95, and the front end of the bolt 96 is screwed into the inner wall of the storage tank. The bolts 96 are distributed around the metal plate to prevent the metal plate from moving sideways. On the bolt 96, a front nut 97 is provided at the front end of the metal plate, and a rear nut 98 is provided at the rear end of the metal plate 94. The front nut 97 and the rear nut 98 prevent the metal plate from moving along the axis of the bolt, thereby fully limiting the movement tendency of the metal plate in all directions and ensuring that the metal plate is fixed at a specific position on the inner wall of the storage tank; the front end and the front shown in this application refer to the direction toward which the drain pipe 7 is provided, and the rear end and the rear are the directions away from the front end and the front.

[0105] To ensure adequate contact between the metal plate and the bolts and nuts, Figure 7 and Figure 8 As shown in , a gasket 99 is also provided on the bolt. The gasket is provided with various specifications. The thickness of gaskets of various specifications is different. A gasket of appropriate thickness can be selected according to specific needs and set on the bolt.

[0106] Specifically, the structural schematic diagram of the metal plate is as follows Figure 7 As shown in , the number of the semicircular grooves 95 can be multiple, and preferably, more semicircular grooves 95 located at the bottom can be provided; for example, 2-3 semicircular grooves are provided at the top, left side and right side, and 3-5 semicircular grooves are provided at the bottom.

[0107] After installing the expansion nails on the inner wall of the container, screw the bolt 96 into the inner wall of the container. First, install and screw the front nut 97 onto the bolt 96 so that the front nut 97 is close to the inner wall of the container. Continue to screw the front nut 97 forward until it is in full contact with the inner wall of the container and cannot be screwed any further. Then compare the positional relationship between the front nuts 97. When the metal plate 94 is just set vertically, the gap sizes between the metal plate and the front nuts 97 are basically different. Then, insert the gasket 99 into the gap. Adjust the combination of gaskets of different thicknesses so that each gap is basically filled.

[0108] If the gasket is an annular gasket, the metal plate needs to be temporarily removed during the process to install the gasket, which is cumbersome to operate and the installation thickness of the gasket is not easy to grasp;

[0109] In the present application, the gasket is preferably arranged in a semicircular ring shape, so that the gasket can be installed in the gap and contact with the bolt 96 without removing the metal plate; more preferably, a magnet is provided on the inner surface of the gasket 99, that is, the arc surface in contact with the bolt 96, so that the gasket can be conveniently fixed on the bolt 96.

[0110] After the gasket 99 is installed, the metal plate is pressed against the gasket, and the rear nut 98 is screwed on the rear end of the bolt to press the metal plate through the rear nut 98, thereby completing the fixation of the metal plate and fixing the metal plate in a nearly vertical setting posture on the uneven inner wall of the holding tank.

[0111] Preferably, the water-swellable rubber pad is arranged between the front nut 97 and the inner wall of the containing tank and between each gasket.

[0112] In a preferred embodiment, the flow pipe 1 , the excitation coil 2 , and the induction electrode 3 are fixedly connected as a whole to form a measurement system, and the measurement system is detachably installed in the holding tank 6 .

[0113] The measuring system is detachable, which can greatly facilitate the cleaning, maintenance and replacement of the measuring system and the sensing electrode 3 and other components therein, shorten the maintenance and replacement work cycle, and improve efficiency;

[0114] The measuring system can be integrally fixed to the water tank 4 and disassembled together with the water tank 4, or it can be integrally fixed to a part of the water tank 4 so that the measuring system can be disassembled while the water tank 4 is disassembled.

[0115] When the measuring system is fixed to the water tank 4 as one, there can be a variety of detachable connection methods between the water tank 4 and the holding tank 6, such as a slot connection, that is, a slot is set on the holding tank 6, and a corresponding key is set on the water tank. When the key is embedded in the slot, the fixed connection between the two can be completed, and when the external force is large enough, the key can be pulled out of the slot, thereby completing the disassembly work between the two.

[0116] Preferably, the water tank 4 and the holding tank are detachably fixed by means of bolts, which can simplify the disassembly process while taking into account the sealing performance between the water tank and the holding tank. While tightening and fixing, the pressure on the sealing ring is increased, which increases the deformation of the sealing ring and improves the sealing performance.

[0117] When the measuring system is integrated with a part of the water tank 4, as shown in FIG. Fig.11 As shown in the figure, the water tank 4 includes a shell 46 with a side opening and a baffle 47 that can be inserted into the shell 46. Preferably, slide grooves 471 with sealing belts are provided on both sides of the baffle 47. The slide grooves 471 cooperate with the side edges of the opening of the shell 46, so that the baffle 47 can slide into the shell 46 from top to bottom, and after sliding into the baffle 47, the bottom and side of the shell 46 form a sealing structure, that is, a box that can store water. When the measuring system needs to be disassembled, the baffle 47 can be taken out from the shell 46 together with the measuring system.

[0118] Preferably, the emergency overflow pipe 45 is also disposed on the baffle 47 .

[0119] When the water tank is installed in the receiving tank, the height position of the water tank needs to be determined based on the position of the water inlet on the water tank and the height position of the drain pipe 7 in the receiving tank. In addition, since the interior of the receiving tank, especially near the drain pipe 7, is not necessarily smooth and flat, it is difficult to determine the height position of the water tank during the installation process. Even if the height position to be installed can be determined, the water tank may not be installed at the desired height position.

[0120] Based on the above problems, in a preferred embodiment, Figure 2 , Figure 3 and Figure 4 As shown in FIG. 4 , a positioning protrusion 43 protruding downward is provided at the bottom of the water tank 4.

[0121] The positioning protrusion 43 has a circular cross section, and its cross section size is slightly smaller than the surface area of ​​the bottom surface of the water tank, so that the water tank can be stably supported by the positioning protrusion 43;

[0122] A supporting seat 63 for supporting the water tank 4 is provided at the bottom of the receiving tank 6 . After the water tank 4 is placed on the supporting seat 63 , it can slide back and forth in the horizontal direction, thereby approaching or moving away from the drain pipe 7 .

[0123] After the water tank is placed on the supporting seat 63, when the water tank is pushed to move so that the water tank and the containing tank clamp the sealing ring, the water tank may move in other directions; in the subsequent use process, the water tank is subjected to the dual effects of the elastic thrust of the sealing ring and the impact of the water flow in the drain pipe 7, and has a tendency to move away from the wall of the containing tank where the water inlet is provided. Therefore, the fixing method of the water tank needs to have a sufficiently large force and also consider the direction of the force, so that it can withstand long-term impact.

[0124] In order to solve the above problem, the present application specifically provides a groove with a waist-shaped cross section on the support seat, and the positioning protrusion can be embedded in the waist-shaped groove and can reciprocate in the groove along the length direction of the waist shape, and the length direction of the waist shape is the direction of approaching or departing from the drain pipe 7. The depth of the groove is substantially equal to the length of the positioning protrusion, so that the installation between the two is more stable and stable, and the water tank 4 is not easy to shake.

[0125] In order to facilitate the detachable fixing of the water tank and to provide continuous thrust for the water tank so that the water tank is fixed in a specific position without being pushed by the dual forces of the elastic thrust of the sealing ring and the water flow, it is further preferred in the present application that a fixing frame 64 is provided in the containing tank 6, and a screwing screw 65 is provided on the fixing frame 64, and the water tank 4 is tightened by the screwing screw 65, so that the water tank 4 and the inner wall of the containing tank 6 clamp the sealing ring 8 together.

[0126] At least one plate on the fixing frame 64 is located on the back of the water tank, and the distance between the fixing frame 64 and the water tank is small, preferably controlled within 30 mm, so that the screws 65 passing through the plate can be pressed against the back of the water tank;

[0127] The back side of the water tank described in this application refers to the side of the water tank away from the sealing ring 8.

[0128] More preferably, at least two of the plate and the screw 65 are provided, so as to ensure that the force on the water tank is uniform, the deformation of the sealing ring 8 is uniform, and the water tank and the sealing ring are not easily deformed in subsequent long-term work.

[0129] Preferably, a gasket 44 is provided on the water tank 4 to abut against the screw 65. The gasket 44 is a metal sheet with a thickness of about 10 mm. The screw transmits the pre-tightening force to the water tank by contacting with the gasket 44.

[0130] The fixed frame 64 can be fixedly installed on the bottom surface of the holding tank, or on the side wall surface of the holding tank. In the present application, the fixed frame 64 is preferably fixedly installed on the side wall surface of the holding tank, specifically, on the side wall surface with a water inlet, so that the shear force on the fixed frame 64 is small, and it mainly only bears the pressure at both ends. The fixed frame 64 has a longer service life, better stability, and is not easy to be damaged.

[0131] Preferably, in order to ensure that the positional relationship between the fixing frame 64 and the metal plate 94 is stable, the metal frame 64 is welded to the metal plate 94 .

[0132] When installing the water tank, first embed the positioning protrusion 43 on the water tank into the groove of the supporting seat 63. At this time, on the back of the water tank, the distance between the gasket 44 on the water tank and the plate on the fixed frame 64 is small. Within the stroke of the screwing screw 65, the screwing screw 65 is screwed so that the screwing screw 65 abuts against the gasket 44, and continues to be screwed, so that the water tank continues to move toward the drain pipe 7, thereby compressing the sealing ring 8 to deform, so that the water tank is sealed with the holding tank and the drain pipe, and under the action of this pressure, the water tank is fixed in the holding tank; when the water tank needs to be disassembled, the screwing screw 65 can be screwed in the reverse direction. It is easy to disassemble and replace, has good stability, and can also take into account the sealing effect.

[0133] In the description of the present invention, it should be noted that the terms "upper", "lower", "inside", "outside", "front", "back", etc. indicate directions or positional relationships based on the directions or positional relationships in the working state of the present invention. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0134] The present invention has been described above in conjunction with preferred embodiments, but these embodiments are only exemplary and serve only as an illustration. On this basis, the present invention may be subjected to a variety of substitutions and improvements, all of which fall within the scope of protection of the present invention.

Claims

1. A movable electromagnetic flowmeter for measuring the flow rate of a partially full pipe drainage, characterized in that: The electromagnetic flowmeter comprises a flow pipe (1), and an excitation coil (2) and an induction electrode (3) arranged outside the flow pipe (1); One end of the circulation pipe (1) is connected to the water tank (4), and the other end is connected to the water outlet (5). The vertical height of the location of the water outlet pipe (5) is higher than the vertical height of the location of the circulation pipe (1), that is, the water in the water tank (4) will overflow from the water outlet pipe (5) only after the circulation pipe (1) is fully filled; The flow meter further comprises a containing tank (6), wherein the flow pipe (1), the water outlet pipe (5) and the water tank (4) are all arranged in the containing tank (6). A water inlet (61) and a water outlet (62) are provided on the side wall of the containing tank (6). The water inlet (61) is connected to the drainage pipe (7) to be measured. The water outlet (62) is located at the lower side of the holding tank (6). Water overflowing from the water outlet pipe (5) gathers at the bottom of the holding tank (6) and flows out from the water outlet (62); A water tank water inlet (41) and a water tank water outlet (42) are provided on the side wall of the water tank (4), wherein the water tank water inlet (41) is in communication with the water inlet (61) and the drain pipe (7); and the water tank water outlet (42) is in communication with the flow pipe (1), so that water in the drain pipe (7) can enter the flow pipe (1) after passing through the water tank (4); The cross-sectional dimension of the water tank water inlet (41) is larger than the cross-sectional dimension of the water inlet (61); the water tank water inlet (41) and the water inlet (61) are both circular holes, and the diameter dimension of the water tank water inlet (41) is 8 to 10 cm larger than the diameter dimension of the water inlet (61); An emergency overflow pipe (45) is provided on the wall of the water tank (4) on which the flow pipe (1) is provided, and the height of the emergency overflow pipe (45) is higher than the outlet height of the water outlet pipe (5); A metal plate (94) is provided on the inner wall of the containing tank (6); the metal plate is fixedly mounted on the inner wall of the containing tank (6) and forms an integral structure with the containing tank (6); A plurality of semicircular slots (95) are formed around the metal plate, and the semicircular slots (95) are evenly distributed on the top, bottom, left side and right side of the metal plate; A bolt (96) is provided at each semicircular slot (95), the front end of the bolt (96) being screwed into the inner wall of the container, a front nut (97) is provided at the front end of the metal plate on the bolt (96), and a rear nut (98) is provided at the rear end of the metal plate (94), and a gasket (99) is also provided on the bolt, the gasket being provided in a semicircular ring shape, and a magnet is provided on the inner surface of the gasket (99), i.e., the arc surface in contact with the bolt (96); The water tank (4) is a box body with closed sides and bottom and an open top. The vertical height of the top opening of the water tank (4) is higher than the vertical height of the water outlet pipe (5), so that the water in the water tank can flow through the circulation pipe (1) in the form of a full pipe flow under the action of water pressure and then overflow from the water outlet pipe (5).

2. The movable electromagnetic flowmeter for measuring the flow rate of a partially full pipe drainage according to claim 1 is characterized in that: A sealing ring (8) is provided around the water inlet (61) between the water tank (4) and the receiving tank (6), so that the water in the drainage pipe (7) directly enters the water tank (4) without leaking out of the water tank (4).

3. The movable electromagnetic flowmeter for measuring the flow rate of a partially full pipe drainage according to claim 1 is characterized in that: The flow pipe (1), the excitation coil (2) and the induction electrode (3) are fixedly connected as a whole to form a measurement system, and the measurement system is detachably installed in the containing tank (6).

4. The movable electromagnetic flowmeter for measuring the flow rate of a partially full pipe drainage according to claim 3 is characterized in that: A supporting seat (63) for supporting the water tank (4) is arranged at the bottom of the containing tank (6); after the water tank (4) is placed on the supporting seat (63), it can slide back and forth in the horizontal direction, thereby approaching or moving away from the drain pipe (7).

5. The movable electromagnetic flowmeter for measuring the flow rate of a partially full pipe drainage according to claim 3 is characterized in that: A fixing frame (64) is provided in the containing tank (6), and screwing screws (65) are provided on the fixing frame (64). The screwing screws (65) are used to tighten the water tank (4), so that the water tank (4) and the inner wall of the containing tank (6) clamp the sealing ring (8) together.

6. The movable electromagnetic flowmeter for measuring the flow rate of a partially full pipe drainage according to claim 5, characterized in that: A gasket (44) is provided on the water tank (4) and abuts against the screw (65).

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