An electromagnetic flowmeter

Abstract

An electromagnetic flowmeter comprises an inner lining pipe, an outer shell, a pole shoe, a coil, an electrode, and also comprises a pair of wire devices and a shielding device; two protrusions are symmetrically arranged in the middle of the outer wall of the inner lining pipe about its axis; a circle of protruding enclosures are respectively arranged at a certain distance from the two ports of the inner lining pipe for fixing the coil and the pole shoe, and a notch is respectively arranged on the inner lining pipe and the enclosure, on the opposite side of the two enclosures, and on both sides of the protrusion for placing the pole shoe, and the two notches are arranged symmetrically about the center point of the inner lining pipe; a through hole is arranged in the middle part of the outer shell, which cooperates with the protrusion and is used for placing the electrode and injecting glue; retaining holes are also arranged on the two sides of the protrusion for snapping the wire device; the wire device and the protrusion form a circle; the coil is wound around the protrusion and the enclosure, and the wire is led through the through hole on the outer shell; the shielding device is installed at the through hole of the outer shell.

Description

Technical Field

[0001] The invention relates to the technical field of liquid flow statistics, and in particular to an electromagnetic flowmeter. Background Art

[0002] As is known to all, an electromagnetic flowmeter is an instrument that uses the electromotive force induced when a conductive fluid passes through an external magnetic field to measure the flow capacity of a conductive fluid flow within a certain period of time, so as to facilitate relevant staff to detect the use of the conductive fluid. It has been widely used in the field of conductive liquid use; the existing electromagnetic flowmeter includes a lining pipe and a measuring coil, a working chamber is arranged in the lining pipe, a water inlet and a water outlet are arranged at the top and bottom of the lining pipe respectively, and the water inlet and the water outlet are both connected to the working chamber, the coil is sleeved on the outer wall of the lining pipe, and the diameter of the working chamber is circular; when the existing electromagnetic flowmeter is in use, the conductive fluid to be measured enters the working chamber from the water inlet, and the flow is measured according to the electromagnetic size generated by the conductive fluid flowing through the working chamber using Faraday's law of electromagnetic induction; however, it is found in the use of the existing electromagnetic flowmeter that in the case of a circular pipe, the speed of the liquid will be slower than that of a pipe with a smaller cross-sectional area, resulting in a low electromotive force of the device under the same conditions, a weak signal, and low excitation efficiency of the device. Summary of the invention

[0003] In order to solve the above technical problems, the present invention provides an electromagnetic flowmeter which can adjust the excitation direction, effectively improve the electromotive force of the device under the same conditions, effectively improve the working signal of the device, and thus improve the excitation efficiency of the device.

[0004] The technical solution adopted by the present invention to solve the technical problem is:

[0005] An electromagnetic flowmeter comprises an inner lining pipe, an outer shell matched with the inner lining pipe, a pair of pole shoes, a coil and an electrode, wherein the inner lining pipe is provided with a working cavity, and a water inlet and a water outlet are respectively provided at the two ends of the inner lining pipe; the invention also comprises a pair of wire devices and a shielding device; two protrusions are symmetrically provided in the middle of the outer wall of the inner lining pipe about its axis; a circle of protruding enclosures are respectively provided at a certain distance from the two ports of the inner lining pipe for fixing the coil and the pole shoes, and a notch is respectively provided on the inner lining pipe and the enclosure, on the opposite side of the two enclosures and on both sides of the protrusion for placing the pole shoes, and the two notches are centrally symmetrically provided with the center point of the inner lining pipe; a through hole is provided in the middle part of the outer shell, which matches with the protrusion and is used to place the electrode; retaining holes are also provided on the two sides of the protrusion for buckling the wire device; the wire device and the protrusion form a circumference; the coil is wound around the protrusion and the enclosure, and the wire is led through the through hole on the outer shell; the shielding device is installed at the through hole of the outer shell.

[0006] Furthermore, the wire device is an arc-shaped structure, a first wire groove is arranged along the circumferential direction of the wire device, and a second wire groove is arranged in the middle of the wire device and in a direction perpendicular to the circumferential direction for routing; pressure pins are respectively arranged at both ends of the wire device, and the pressure pins are used to insert into the retaining holes on the protrusion to fix the electrode.

[0007] Furthermore, the pressing needle is in a "∏" shape, and both corners of the pressing needle are chamfered.

[0008] Furthermore, the electrode is a "T"-shaped electrode.

[0009] Furthermore, the shielding device is made of metal, and comprises a shielding shell and a shielding cover, and the shielding shell and the shielding cover are fixed by bolts.

[0010] Furthermore, a clamping groove is provided between the two enclosures and the water inlet and the water outlet, and clamping grooves are provided on the upper surface and the side of the enclosure respectively, and rubber gaskets higher than the depth of the clamping grooves are placed in the clamping grooves.

[0011] Furthermore, the outer shell is made of pure iron, and the lining pipe is made of plastic.

[0012] Furthermore, the working chamber of the lining pipe is a square working chamber, and a wider side of the square working chamber is opposite to the pole shoe.

[0013] Furthermore, bolt holes are respectively arranged on the end faces of both ends of the shell for connecting with the pipeline through flanges.

[0014] The beneficial effects of the present invention are as follows: the inner diameter of the lining pipe is changed to a square diameter in the embodiment of the present invention, and the water flow becomes wider and narrower, so that the liquid flow speed in the working chamber becomes higher, and the signal strength in the working chamber can be increased at the same time, the excitation direction is changed by fixing the magnetic poles, and the magnetic poles are used to form a circle, and the coil is surrounded by the magnetic poles, the efficiency is improved, the excitation direction can be adjusted, and the electromotive force of the device under the same conditions is effectively improved, and the working signal of the device is effectively improved, thereby improving the excitation efficiency of the device. Glue can be injected through the through hole to prevent the coil from loosening, so that the glue fills the space, and rust corrosion can also be prevented.

[0015] At the same time, the present invention is provided with a wire guide device, which can fix the coil and place the coil loosely; and can guide the wire led out of the coil through the wire guide groove.

[0016] The present invention also provides clamping grooves on the enclosure, between the two enclosures and the water inlet and the water outlet, and rubber gaskets are placed in the clamping grooves for sealing.

[0017] The present invention also provides a shielding shell to prevent signal interference. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the present invention;

[0019] Figure 2 It is a schematic diagram of the structure of the lining pipe fitting;

[0020] Figure 3 is a schematic diagram of the structure of the conductor device;

[0021] Figure 4 Schematic diagram of the assembly structure of the lining pipe fittings, the conductor device and the pole shoe;

[0022] Figure 5 is a schematic diagram of the structure of the electrode;

[0023] Figure 6 It is a schematic diagram of the structure of the pole shoe;

[0024] Figure 7 is a schematic diagram of the structure of the shielding shell;

[0025] Figure 8 is a schematic diagram of the structure of the shielding cover;

[0026] In the figure: 1. lining pipe; 11. working chamber; 12. protrusion; 13. enclosure; 14. notch; 2. pole shoe; 3. outer shell; 31. through hole; 32. bolt hole; 4. positioning groove; 5. wire device; 51. pressing needle; 52. first wire groove; 53. second wire groove; 6. shielding shell; 61. shielding cover; 7. electrode. DETAILED DESCRIPTION

[0027] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0028] like Figures 1 to 8As shown, an electromagnetic flowmeter of the present invention comprises an inner lining pipe 1, an outer shell 3 matched with the inner lining pipe, a pair of pole shoes 2, a coil and an electrode 7, wherein the inner lining pipe 1 is provided with a working chamber 11, and a water inlet and a water outlet are respectively provided at both ends of the inner lining pipe; it also comprises a pair of wire devices 5 and a shielding device; two protrusions 12 are symmetrically provided in the middle of the outer surface of the inner lining pipe about its axis; a circle of protruding enclosures 13 are respectively provided at a certain distance from the two ports of the inner lining pipe, which are used to fix the coil and the pole shoes, and between the inner lining pipe and the enclosure A notch 14 is provided on the upper and opposite sides of the two enclosures and on both sides of the protrusion for placing the pole shoe, and the two notches are symmetrically arranged with respect to the center point of the lining pipe; a through hole 31 is provided in the middle part of the shell, which cooperates with the protrusion and is used for placing the electrode and injecting glue; retaining holes are also provided on the two sides of the protrusion for snapping on the wire device 5; the wire device and the protrusion form a circle; the coil is wound around the protrusion and the enclosure, and the wire is led through the through hole on the shell; the shielding device is installed at the through hole of the shell.

[0029] like Figure 3-5 As shown, the wire device 5 is an arc-shaped structure, a first wire groove 52 is provided in the wire device 5 along the circumferential direction, and a second wire groove 53 is provided in the middle of the wire device and perpendicular to the circumferential direction for routing; pressure pins 51 are provided at both ends of the wire device, and the pressure pins are used to insert into the retaining holes on the protrusions to fix the electrode 7. The pressure pin 51 is "∏" shaped, and the two corners of the pressure pin are chamfered. The electrode 7 is a "T" shaped electrode.

[0030] like Figure 7 and Figure 8 As shown, the shielding device is made of metal, including a shielding shell 6 and a shielding cover 61, and the shielding shell and the shielding cover are fixed by bolts. The material of the shielding device can be copper, iron, etc., which can prevent signal interference.

[0031] A clamping groove 4 is also provided between the two enclosures and the water inlet and outlet. The upper surface and side surfaces of the enclosure are respectively provided with clamping grooves 4 for waterproofing and fixing. A rubber gasket higher than the depth of the clamping groove is placed in the clamping groove.

[0032] The outer shell is made of pure iron, and the inner lining pipe is a plastic pipe. The working cavity of the inner lining pipe is a square working cavity, and the wider side of the square working cavity is opposite to the pole shoe 2. Bolt holes 32 are respectively provided on the end faces of both ends of the outer shell for connecting with the pipeline through flanges.

[0033] like Figure 2As shown, the inner diameter of the lining pipe is changed to a square diameter, and the water flow becomes wider and narrower, so that the liquid flow speed in the working chamber becomes higher, and the signal strength in the working chamber can be increased at the same time. The excitation direction is changed by fixing the magnetic poles, and the magnetic poles are used to form a circle. The coil is wrapped around the magnetic poles, and the efficiency is improved. The excitation direction can be adjusted, and the electromotive force of the device under the same conditions is effectively improved. The working signal of the device is effectively improved, thereby improving the excitation efficiency of the device. The placement cavity is used to place the lining pipe, pole shoes and coils.

[0034] An electromagnetic flowmeter of the present invention has a shell made of pure iron and an inner lining pipe 1 made of plastic. The pure iron material can ensure the working effect of the coil while protecting the internal structure, and the inner lining pipe is made of plastic to prevent the coil from being affected by the magnetic conductivity of the inner lining pipe when working near the inner lining pipe.

[0035] An electromagnetic flowmeter of the present invention is further provided with a retaining groove between two enclosures and a water inlet and a water outlet, and a rubber gasket is fixedly provided in the retaining groove; the working sealing of the device can be improved to prevent the inflow of water during operation from affecting the operation of the device.

[0036] In an electromagnetic flowmeter of the present invention, a through hole 31 is provided on the outer wall of the housing 3; the through hole is used for wiring and glue injection, and the purpose of the glue injection is to prevent moisture and withstand pressure.

[0037] An electromagnetic flowmeter of the present invention, when working, the user first changes the inner diameter of the lining pipe to a square diameter, the water flow becomes wider and narrower, so that the liquid flow speed in the working chamber becomes higher, and the signal strength in the working chamber can be increased at the same time, the excitation direction is changed by fixing the magnetic poles, the magnetic poles are used to form a circle, and the coil is wrapped around the magnetic poles, the efficiency is improved, the excitation direction can be adjusted, and the electromotive force of the device under the same conditions is effectively improved, and the working signal of the device is effectively improved, thereby improving the excitation efficiency of the device, the placement cavity is used to place the lining pipe, the pole shoe and the coil, and the device is moved as a whole to the position required by the user, the iron pipe can ensure the working effect of the coil and protect the internal structure at the same time, the lining pipe is made of plastic material to prevent the coil from being affected by the magnetic conductivity of the lining pipe when working near the lining pipe.

[0038] In the electromagnetic flowmeter of the present invention, unless otherwise specified, the directional words contained in the terms such as "up, down, left, right, front, back, inside, outside, vertical, horizontal" only represent the orientation of the term in normal use, or are common names understood by those skilled in the art, and should not be regarded as limitations on the term. At the same time, nouns such as "first", "second" and "()" do not represent specific quantities and orders, but are merely used to distinguish names. Moreover, the terms "include", "comprise" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or equipment that includes a series of elements includes not only those elements, but also includes other elements that are not explicitly listed, or also includes elements inherent to such process, method, article or equipment.

[0039] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. An electromagnetic flowmeter, comprising an inner lining pipe, a housing matched with the inner lining pipe, a pair of pole shoes, a coil, and electrodes, wherein the inner lining pipe is provided with a working chamber, and a water inlet and a water outlet are respectively provided at both ends of the inner lining pipe; wherein: It also includes a pair of wire devices and a shielding device; two protrusions are symmetrically arranged in the middle of the outer wall of the lining pipe and about its axis; a circle of protruding enclosures are respectively arranged at a certain distance from the two ports of the lining pipe, which is used to fix the coil and the pole shoe, and a notch is respectively arranged on the lining pipe and the enclosure, on the opposite side of the two enclosures, and on both sides of the protrusion, which is used to place the pole shoe, and the two notches are arranged symmetrically about the center point of the lining pipe; a through hole is arranged in the middle part of the outer shell, which cooperates with the protrusion and is used to place the electrode and inject glue; retaining holes are also arranged on the two sides of the protrusion for snapping the wire device; the wire device and the protrusion form a circle; the coil is wound around the protrusion and the enclosure, and the wire is led through the through hole on the outer shell; the shielding device is installed at the through hole of the outer shell.

2. The electromagnetic flowmeter according to claim 1, characterized in that: The wire device is an arc-shaped structure, with a first wire groove arranged along the circumferential direction of the wire device, and a second wire groove arranged in the middle of the wire device and perpendicular to the circumferential direction for routing; pressure pins are arranged at both ends of the wire device, respectively, and the pressure pins are used to insert into the retaining holes on the protrusions to fix the electrodes.

3. The electromagnetic flowmeter according to claim 2, characterized in that: The pressing needle is in the shape of "∏", and both corners of the pressing needle are chamfered.

4. The electromagnetic flowmeter according to claim 2, characterized in that: The electrode is a "T" shaped electrode.

5. The electromagnetic flowmeter according to claim 1, characterized in that: The shielding device is made of metal and comprises a shielding shell and a shielding cover, and the shielding shell and the shielding cover are fixed by bolts.

6. The electromagnetic flowmeter according to claim 1, characterized in that A clamping groove is also arranged between the two enclosures and the water inlet and the water outlet. The clamping grooves are respectively arranged on the upper surface and the side of the enclosure. Rubber gaskets higher than the depth of the clamping grooves are placed in the clamping grooves.

7. The electromagnetic flowmeter according to claim 1, characterized in that: The outer shell is made of pure iron, and the inner lining pipe is made of plastic.

8. The electromagnetic flowmeter according to claim 7, characterized in that: The working chamber of the lining pipe is a square working chamber, and a wider side of the square working chamber is opposite to the pole shoe.

9. The electromagnetic flowmeter according to claim 1, characterized in that: Bolt holes are respectively arranged on the end surfaces of both ends of the shell for connecting with the pipeline through flanges.

Images