Electromagnetic water meter sensor structure

Abstract

The utility model provides an electromagnetic water meter sensor structure which comprises a flange, a side plate, a flow guide pipe, a macromolecule plastic measuring pipe, a macromolecule plastic plate, an electrode, a pole shoe, a magnet exciting coil, a cover plate, a connecting block, a silicon steel sheet, a shielding silicon steel sheet, a gasket, a nut and a sealing component. A measuring tube liner of the sensor is made of a standard polymer plastic tube, and a flange flanging is made of a hot-melt polymer plastic plate. Compared with a traditional electromagnetic water meter sensor measuring pipe, the polymer plastic pipe is good in electrical insulation performance, resistant to corrosion, not prone to abrasion and good in adaptability to media and temperature, and meanwhile the requirements for hygiene permission and the like are met. And the hot melting process is mature, simple to operate, attractive in molding, low in manufacturing cost, long in service life, energy-saving and environment-friendly.

Description

Technical Field

[0001] The utility model relates to the field of electromagnetic water meters, in particular to an electromagnetic water meter sensor lining material and a hot-melt process structure, and in particular to a sensor structure using a polymer plastic tube as an inner lining tube and a hot-melt process. Background Art

[0002] Electromagnetic water meter is an intelligent water meter based on Faraday's law of electromagnetic induction. It is an instrument that measures flow rate through the electromotive force induced by an external magnetic field. It is widely used in various fields of smart water services. Since the measuring electrode required by the electromagnetic water meter sensor cannot be connected to the metal flow conduit, an electrical insulation lining is required on the inside of the metal flow conduit. Its function is to increase the corrosion resistance of the measuring conduit and prevent the induced electromotive force from being short-circuited by the metal flow conduit wall.

[0003] Most of the current electromagnetic water meters use rubber as the lining. Since tap water contains chloride ions, the rubber lining will become powdery after a period of use, affecting the sanitation and safety of the water quality. The production of rubber linings requires complex processes such as vulcanization, which is not environmentally friendly. In addition, most electromagnetic water meter manufacturers use outsourcing, which includes high overall costs such as transportation and long delivery times. Some electromagnetic water meters use F4, F46, and spraying as linings, which are all complex manufacturing processes and high costs. Some of them are not stable enough, which is not conducive to the widespread promotion of electromagnetic water meters in the water industry.

[0004] The electromagnetic water meter sensor lining requires good electrical insulation, corrosion resistance and wear resistance, good adaptability to media and temperature, and at the same time, it must meet the conditions of health permits. The use of polymer plastic pipes as linings meets this series of requirements well, and the performance advantages are more obvious. ① Polymer plastic pipes comply with national standards, and directly select standard pipes from pipe manufacturers to reduce material costs. ② Sanitary and non-toxic green building materials are very suitable for drinking water pipes. ③ Low temperature resistance and good impact resistance are not affected by local regional temperature changes. ④ It has excellent chemical corrosion resistance and does not breed bacteria. ⑤ The wear resistance is 4 times that of steel pipes. ⑥ It has a smooth inner surface and does not scale. Its flow area will not decrease with the increase of operating time, which is very suitable for the requirements of sensor linings.

[0005] The manufacturing process of the lining is simple. First, the plastic pipe is inserted into the guide body through a press. Then the polymer plastic pipe and the polymer plastic plate are fused by a hot melt process. The fused plastic plate is equivalent to the flange of the traditional rubber lining, which plays a role in connection, sealing and aesthetics. The excess fusion material on the plastic plate can be milled flat by a machining center, and the appearance is very beautiful after milling. Summary of the invention

[0006] The lining of the electromagnetic water meter sensor of the utility model is made by hot-melt process. The wall thickness of the polymer plastic tube is generally selected to be 5mm. If it is too thick, it will affect the magnetic field strength. If it is too thin, the strength is not enough and the metal flow guide tube cannot be inserted. According to the outer diameter of the standard polymer plastic tube, match the metal flow guide tube of the same specification to make the outer diameter of the plastic tube consistent with the inner diameter of the metal flow guide tube. Cut a polymer plastic tube that is 25mm longer than the unlined flow guide body, and use a press to press the plastic tube into the flow guide body. The plastic tube and the flow guide tube form a tight interference fit. Then, according to the size of the contact surface between the plastic ring and the flange, apply a layer of metal and plastic bonding glue on the flange. Use a hot melter of the same specification, adjust the heating temperature to about 260°, and heat the plastic tube and the plastic ring at the same time. The thickness of the plastic ring is selected to be 10mm to ensure the effective contact area and strength between the plastic tube and the plastic ring. After the hot melter melts the plastic, take it out and quickly put the plastic ring into the plastic tube and press it tightly. After the glue solidifies, use a machining center to mill off the excess pipe material to make it flush with the plastic ring, thus forming a sealing surface, which is equivalent to the flange of the rubber lining on the flange surface.

[0007] In order to achieve the above purpose, the technical solution of the utility model is as follows:

[0008] An electromagnetic water meter sensor structure, comprising a flange, a side plate, a flow guide tube, a polymer plastic measuring tube, a polymer plastic plate, an electrode, a pole shoe, an excitation coil, a cover plate, a connecting block, a silicon steel sheet, a shielding silicon steel sheet, a gasket, a nut, and a sealing component, wherein:

[0009] The flange is a plate-type flat-weld flange with a concave surface;

[0010] The side plates are concentric rings and made of metal;

[0011] The guide tube is made of stainless steel and is divided into two types according to whether it has pressure detection. The one with pressure detection has an additional pressure hole;

[0012] The outer diameter of the polymer plastic measuring tube is consistent with the inner diameter of the metal flow guide tube;

[0013] The polymer plastic plate is a concentric ring, and the plastic tube and the plastic plate are welded together using a hot melt process;

[0014] The electrodes are a pair of measuring electrodes and a pair of grounding electrodes;

[0015] The pole shoe is made of carbon steel and has a through hole in the middle for fixing the ground electrode. The pole shoe is evenly and symmetrically spot welded on the guide tube.

[0016] The excitation coil is an enameled wire wound into a rectangle and fixed on the pole shoe;

[0017] The cover plate is divided into two pieces, the upper and lower pieces, which are formed by rolling a steel plate. The middle of the upper cover plate is punched with a hole for passing a lead wire, and the edge is welded with the side plate to form a sealing structure.

[0018] The connecting block is connected to the converter structure, the lower end is welded to the upper cover plate, the upper end step surface is machined, and the upper end is connected to the converter part;

[0019] The silicon steel sheet is a non-oriented silicon steel sheet, which wraps the excitation coil, the pole shoe and the electrode;

[0020] The shielding silicon steel sheet is a non-oriented silicon steel sheet, with four layers stacked and fixed by screws;

[0021] The gaskets, nuts and sealing components are all standard parts.

[0022] Furthermore, the flow guide tube can be divided into two types according to whether it has pressure detection. One is a flow guide tube without pressure detection, with 4 electrode holes evenly distributed in the middle, and the two measuring electrode holes are larger and symmetrical than the grounding electrode hole; the other is a flow guide tube with pressure detection, with an additional pressure taking hole of the same size as the grounding electrode hole added to the flow guide tube without pressure detection, and the pressure taking hole is downstream of the flow.

[0023] Beneficial effects of the utility model:

[0024] The utility model discloses an electromagnetic water meter sensor whose lining material is made of a standard polymer plastic pipe, and the flange surface is flanging with a polymer plastic plate, and a hot-melt process is adopted. The lining has good insulation, corrosion resistance, a smooth surface and is not easy to scale, and has good stability in measuring fluids. It has excellent high and low temperature resistance and is widely used in the environment. It has high tensile strength, is not easy to break, and has a long service life. The product quality is stable and can reach food grade in terms of hygiene. The hot-melt process is mature and simple, with low labor costs and a high production qualification rate, which is different from the rubber lining that requires complex processes such as vulcanization. Standard polymer plastic pipes are used, with low procurement costs and reliable quality. The production process does not generate hazardous waste and is hygienic and environmentally friendly. Compared with traditional sensor linings, there have been great improvements in manufacturing costs, production cycles, product quality, service life, sanitation and environmental protection, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a cross-sectional view of the structure of an electromagnetic water meter sensor of the present invention.

[0026] FIG2 is a schematic diagram of the electrode structure of an electromagnetic water meter sensor structure of the utility model. DETAILED DESCRIPTION

[0027] The technical solution of the utility model is described in detail below in conjunction with specific implementation methods and accompanying drawings.

[0028] As shown in Figure 1 and Figure 2, an electromagnetic water meter sensor structure comprises a flange (1), a side plate (2), a stainless steel flow guide tube (3), a polymer plastic tube (4), a polymer plastic plate (5), a connecting block (6), a cover plate (7), a coil (8), and a pole shoe (9).

[0029] Use the side panel assembly tool to spot weld the side panel (2) and the guide tube (3), and use the flange assembly tool to spot weld the flange (1) and the guide tube (3). Check whether the guide tube length, direction, verticality, etc. are qualified, and then use the welding robot to complete the welding.

[0030] A polymer plastic tube (4) of the same specification and 25 mm longer than the guide body is cut, and the welded guide body is placed vertically on a press machine. The plastic tube is pressed into the guide tube by the press machine, and the two ends are extended to the same length.

[0031] Apply glue on the flange surface, and the glue area should be consistent with the contact area of ​​the plastic ring. Use the female end of the hot melter to cover the protruding plastic tube, insert the male end into the inner diameter of the polymer plastic plate (5) and heat it to 260°. When the plastic is slightly melted, take out the hot melter, cover the plastic tube with the polymer plastic plate, and press it tightly with an object. After the glue solidifies, place the lined guide body vertically on the CNC machining center, mill off the excess material of the plastic tube, and the lined guide body is completed.

[0032] The installation method of the remaining connecting block (6), cover plate (7), coil (8), pole shoe (9), and electrode (10) is the same as that of an ordinary electromagnetic water meter. Electrodes (10) of different materials are installed according to customer needs. The two measuring electrodes are insulated from the flow guide tube, and the two grounding electrodes are connected to the flow guide tube. Use nuts (13), springs (12), and insulating gaskets (11) to lock and ensure the tightness of the electrode and the lining. If a pressure detection function is required, a pressure hole is added to the flow guide tube, a pressure seat is welded, and a pressure sensor is installed.

[0033] Use argon arc welding to spot weld the pole shoe (9), fix the coil (8) on the pole shoe, and then use silicon steel sheet (15) to wrap the coil tightly. Use hot melt adhesive to fix the excitation wire, signal wire, ground wire, etc. on the silicon steel sheet, and wrap the shielding silicon steel sheet (15) on the outside. Then assemble and weld the upper and lower cover plates (7) and the connecting block (6), arrange the excitation and signal wires, and measure the insulation, and the production of the electromagnetic water meter sensor is completed.

[0034] The polymer plastic pipes and polymer plastic plates described above are applied to the production of electromagnetic water meter linings using hot melt process technology. In order to make the description concise, not all the polymer plastic pipes that can be welded in the above examples are listed one by one, and the application scope of the lining, such as electromagnetic flowmeter sensors that require linings, can all be achieved using this process, and should be considered as the scope of this specification.

Claims

1. An electromagnetic water meter sensor structure, comprising a flange, a side plate, a flow guide tube, a polymer plastic measuring tube, a polymer plastic plate, an electrode, a pole shoe, an excitation coil, a cover plate, a connecting block, a silicon steel sheet, a shielding silicon steel sheet, a gasket, a nut, and a sealing component, characterized in that: The flange is a plate-type flat-weld flange with a concave surface; The side plates are concentric rings and made of metal; The guide tube is made of stainless steel and is divided into two types according to whether it has pressure detection. The one with pressure detection has an additional pressure hole; The outer diameter of the polymer plastic measuring tube is consistent with the inner diameter of the metal flow guide tube; The polymer plastic plate is a concentric ring, and the plastic tube and the plastic plate are welded together using a hot melt process; The electrodes are a pair of measuring electrodes and a pair of grounding electrodes; The pole shoe is made of carbon steel and has a through hole in the middle for fixing the ground electrode. The pole shoe is evenly and symmetrically spot welded on the guide tube. The excitation coil is an enameled wire wound into a rectangle and fixed on the pole shoe; The cover plate is divided into two pieces, the upper and lower pieces, which are formed by rolling a steel plate. The middle of the upper cover plate is punched with a hole for passing a lead wire, and the edge is welded with the side plate to form a sealing structure. The connecting block is connected to the converter structure, the lower end is welded to the upper cover plate, and the upper end step surface is machined and connected to the converter part; The silicon steel sheet is a non-oriented silicon steel sheet, which wraps the excitation coil, the pole shoe and the electrode; The shielding silicon steel sheet is a non-oriented silicon steel sheet, with four layers stacked and fixed by screws; The gaskets, nuts and sealing components are all standard parts.

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