CN209821232U - Flat plate type electromagnetic flow velocity sensor and electromagnetic flow velocity meter for open channel flow measurement - Google Patents
Flat plate type electromagnetic flow velocity sensor and electromagnetic flow velocity meter for open channel flow measurement Download PDFInfo
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- CN209821232U CN209821232U CN201920562830.1U CN201920562830U CN209821232U CN 209821232 U CN209821232 U CN 209821232U CN 201920562830 U CN201920562830 U CN 201920562830U CN 209821232 U CN209821232 U CN 209821232U
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Abstract
The utility model discloses a plate electromagnetism velocity sensor and be used for electromagnetic current meter of open channel current surveying. The flat-plate type electromagnetic flow velocity sensor comprises a protective shell, a plurality of electrodes, an electromagnetic coil and a polytetrafluoroethylene protective plate; the upper surface of the protective shell is flat; an opening is formed in the middle of the upper surface of the protective shell, and the opening extends downwards along the longitudinal direction to form a cavity; the cavity is used for placing the electromagnetic coil and the plurality of electrodes; the polytetrafluoroethylene protective plate is arranged to be capable of being clamped and fixed with the opening; the polytetrafluoroethylene protection plate is provided with a plurality of electrode holes for the plurality of electrodes to penetrate through the polytetrafluoroethylene protection plate and then extend into the cavity; the plurality of electrodes are arranged in a linear manner. The utility model discloses a plate electromagnetism velocity of flow sensor is applicable to the lower open channel current surveying of playing the velocity of flow, and can improve measurement accuracy.
Description
Technical Field
The utility model relates to a plate electromagnetism velocity of flow sensor and electromagnetism velocity of flow appearance, especially a plate electromagnetism velocity of flow sensor and be used for the electromagnetism velocity of flow appearance of open channel survey flow.
Background
At present, the flow velocity measurement of water bodies in open channels such as rivers, lakes, and channels mainly adopts an ultrasonic type flow velocity meter, a rotary cup type (mechanical type) flow velocity meter, a doppler type flow velocity meter, an electromagnetic type flow velocity meter, and the like. The accuracy and the durability of ultrasonic type current meter and rotary cup type current meter are poor, the price of Doppler type current meter is expensive, and the requirement for testing environment is strict. The electromagnetic flow meter is a good choice for measuring the flow rate of the open channel.
The working principle of the electromagnetic type current meter is based on Faraday's law of electromagnetic induction, when a conductive fluid flows through the magnetic field of the electromagnetic type current meter, an induced electromotive force proportional to the average flow velocity is generated in the direction perpendicular to the flow velocity and the magnetic field, and the induced electromotive force is detected by an electrode on the electromagnetic type current meter.
CN207263237U discloses a portable open channel electromagnetic flowmeter, including controller and electromagnetic sensor body, the open channel electromagnetic flowmeter further includes: the open channel electromagnetic flowmeter comprises a measuring rod, an adjusting slider, an electromagnetic sensor body and a transverse support, wherein the adjusting slider and the electromagnetic sensor body are sleeved on the measuring rod and are fixedly connected through the transverse support, a controller is connected with the electromagnetic sensor body through a waterproof joint, the height of the electromagnetic sensor body is adjusted by adjusting the position of the adjusting slider on the measuring rod, the open channel electromagnetic flowmeter further comprises three electrodes, and the electrodes are arranged on the bottom surface of the electromagnetic sensor body. The three electrodes of the open channel electromagnetic flowmeter disclosed in the patent document are arranged in a triangular shape, so that the starting flow velocity is high, and the open channel electromagnetic flowmeter is not suitable for open channel flow measurement with low starting flow velocity.
CN203605989U discloses a canal type measuring head electromagnetic flowmeter, including: a canal measuring head; the measuring head connecting rod is connected with the canal type measuring head; the measuring electrodes are symmetrically arranged on the two guide wings of the canal measuring head; the electrode hole process plug is used for sealing the gap of the measuring electrode inserted into the canal type measuring head; the electrode outlet lead is connected with the measuring electrode and penetrates out of the axial coaxial drilling hole of the canal type measuring head guide wing; the excitation coil is provided with an excitation coil mandrel, and the excitation coil mandrel is screwed into a central threaded hole of the channel measuring head by coating reinforcing glue on a connecting threaded section; and the electrode outgoing lead and the excitation coil outgoing lead are bound on the periphery of the coil and penetrate into the measuring head connecting rod. The connecting part of the measuring electrode, which is arranged in the channel measuring head, is coated with high-temperature sealant. The technical plug of the electrode hole is a polysulfone plug. This patent document reduces the degree of clogging of the measurement medium by improving the flow performance of the insertion head, resulting in a high start-up flow rate, which is not suitable for open channel flow measurement at a low start-up flow rate.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a plate electromagnetism velocity of flow sensor, its open channel that is applicable to lower velocity of flow of having played is surveyed and is flowed, and can improve measurement accuracy.
Another object of the present invention is to provide an electromagnetic current meter, which can measure the lower velocity of flow.
The utility model adopts the following technical scheme to realize the purpose.
On one hand, the utility model provides a flat electromagnetic flow velocity sensor, which comprises a protective shell, a plurality of electrodes, an electromagnetic coil and a polytetrafluoroethylene protective plate;
the upper surface of the protective shell is flat; an opening is formed in the middle of the upper surface of the protective shell, and the opening extends downwards along the longitudinal direction to form a cavity;
the cavity is used for placing the electromagnetic coil and the plurality of electrodes;
the polytetrafluoroethylene protective plate is arranged to be capable of being clamped and fixed with the opening; the polytetrafluoroethylene protection plate is provided with a plurality of electrode holes which are respectively used for the plurality of electrodes to penetrate through the polytetrafluoroethylene protection plate and then extend into the cavity;
the plurality of electrodes are arranged in a linear manner.
According to the flat plate type electromagnetic flow velocity sensor of the present invention, preferably, the electrode includes an electrode tip, a transition portion and an electrode rod which are connected in sequence; the upper part of the electrode head is provided with an outward convex curved surface; the transition part is of a circular truncated cone structure; the electrode rod is of a cylindrical structure.
According to the utility model discloses a flat plate electromagnetism velocity of flow sensor, preferably, solenoid's internal diameter is 25 ~ 45mm, and the external diameter is 35 ~ 55mm, and thickness is 25 ~ 45 mm.
According to the utility model discloses a flat plate electromagnetism velocity of flow sensor, preferably, solenoid adopts the enameled wire coiling to form.
According to the utility model discloses a flat electromagnetic flow velocity sensor, preferably, the thickness of polytetrafluoroethylene protection plate is 1 ~ 8 mm.
According to the utility model discloses a flat plate electromagnetism flow velocity sensor, preferably in the cavity, it has insulating resin to fill between the space between solenoid and a plurality of electrode.
According to the utility model discloses a flat electromagnetic flow velocity sensor, preferably, be equipped with at least one wire hole on the side of cavity.
According to the utility model discloses a flat plate electromagnetism velocity of flow sensor, preferably, the bottom surface of cavity is equipped with the encapsulating hole.
According to the utility model discloses a flat plate electromagnetism velocity of flow sensor, preferably, the upper surface of protecting sheathing is close to the edge and is provided with the mounting hole.
On the other hand, the utility model provides an electromagnetic current meter for open channel flow measurement, it includes controller and above-mentioned flat plate electromagnetic current sensor; the controller is configured to control the flat plate type electromagnetic flow rate sensor.
The utility model discloses a plate electromagnetic flow velocity sensor adopts a plurality of electrodes to be the linear type and arranges, is applicable to the lower open channel current surveying of playing the velocity of flow, and can improve measurement accuracy. According to the utility model discloses preferred technical scheme, the thickness of polytetrafluoroethylene protection plate is 1 ~ 8mm, can fall to minimum with the coefficient of friction that the open channel flowed through flat electromagnetic flow velocity sensor surface, can not produce the interference to the electrode.
Drawings
Fig. 1 is an exploded view of the flat-plate electromagnetic flow velocity sensor of the present invention.
Fig. 2 is a schematic structural diagram of an electrode according to the present invention.
The reference numerals are explained below:
1-an electrode; 11-an electrode head; 12-a transition portion; 13-an electrode rod; 2-a protective housing; 21-a cavity; 22-outlet hole; 23-glue pouring holes; 24-mounting holes; 3-an electromagnetic coil; 4-polytetrafluoroethylene protective plate.
Detailed Description
The present invention will be further described with reference to the following specific examples, but the scope of the present invention is not limited thereto.
< Flat plate type electromagnetic flow velocity sensor >
The utility model discloses a flat electromagnetic flow velocity sensor includes protecting sheathing, a plurality of electrode, solenoid and polytetrafluoroethylene protection shield.
In the present invention, the number of the electrodes is 3. The electrodes may be those well known in the art. The electrode can be an integrated structure or a splicing structure. Preferably, the electrode comprises an electrode head, a transition part and an electrode rod which are connected in sequence. The preferred upper portion of the electrode head has an outwardly convex curved surface. The transition part is preferably of a truncated cone structure. Preferably, the large-diameter end of the circular truncated cone structure is connected with the electrode head; the small-diameter end of the circular truncated cone structure is connected with the electrode rod. The electrode rod is preferably of cylindrical construction. The plurality of electrodes may be formed of stainless steel; preferably 316 stainless steel. The plurality of electrodes are preferably arranged in a linear fashion. According to a specific embodiment of the present invention, the number of the electrodes is 3, and the electrodes are arranged in a linear manner. The electrodes are arranged in a linear mode, interference between the positive electrode and the negative electrode can be reduced, the voltaic effect is not generated when the electrodes are in contact with water, the open channel flow measurement device is suitable for open channel flow measurement with low flow measurement speed, and the measurement accuracy can be improved.
The utility model discloses in, solenoid can adopt the enameled wire coiling to form, and the preferred high temperature enameled copper wire coiling that adopts forms. The enamel wire may be formed using materials known in the art. The wire diameter of the enameled wire can be 0.35-0.60 mm, and preferably 0.40-0.55 mm. According to the utility model discloses a concrete embodiment, solenoid adopts the high temperature enameled copper wire coiling that the line footpath is 0.45 ~ 0.50mm to form. The internal resistance of the electromagnetic coil may be 35 to 55 Ω, preferably 40 to 50 Ω. The inner diameter of the electromagnetic coil may be 25 to 45mm, preferably 30 to 40 mm. The outer diameter of the electromagnetic coil may be 35 to 55mm, preferably 40 to 50 mm. The electromagnetic coil is formed by winding the enameled wire, and can generate stronger magnetic field intensity when passing current, so that the measurement precision of open channel flow measurement is further improved.
In the present invention, the protective casing has a flat plate-like structure, i.e., the upper surface of the protective casing is flat plate-like, and the shape of the lower surface is not limited. The length of the upper surface of the protective casing may be 300 to 900mm, preferably 550 to 650 mm. The width of the upper surface of the protective shell can be 200-600 mm, preferably 350-450 mm. The middle part of the upper surface of the protective shell is provided with an opening, and the opening extends downwards along the longitudinal direction to form a cavity. The cavity is used for placing the electromagnetic coil and the plurality of electrodes. The opening can be fixed with polytetrafluoroethylene protection shield matched with block. The opening can be rectangular; the side length of the square is preferably 100-180 mm, the side length of the square is preferably 120-160 mm, and the side length of the square is more preferably 130-150 mm. The depth of the cavity can be 20-60 mm, and preferably 30-50 mm. The protective casing with the structural design is suitable for open channel flow measurement with low flow measurement starting speed, and can improve the measurement precision.
The utility model discloses in, protective housing can be nearly cuboid structure, preferably is the cuboid structure. The four corners of the upper surface of the protective shell can be connected in an arc shape. The protective shell can be an integrated structure or a splicing structure. The four corners of the upper surface of the protective shell can be respectively provided with mounting holes, and the number of the mounting holes is not particularly limited. The upper surface of the protective shell close to the edge can also be provided with mounting holes, and the number of the mounting holes is not particularly limited. The protective housing may be formed of stainless steel; preferably 316 stainless steel. The protective shell is made of stainless steel, cannot be magnetized, does not generate voltaic effect when in contact with water flow, and can well protect internal components from being damaged.
The utility model discloses in, in the cavity, it has insulating resin to fill between the space between solenoid and a plurality of electrodes to guarantee that inner structure is waterproof. The insulating resin is preferably an epoxy resin. At least one wire outlet hole is arranged on one side surface of the cavity. The wire outlet hole is used for leading out the cables connected with the electrodes out of the cavity. The bottom surface of the cavity can be provided with a glue filling hole for filling insulating resin. The glue hole may be of any shape, preferably circular.
In the utility model discloses in, the polytetrafluoroethylene protection shield can be for with opening assorted structure, preferably rectangular shaped plate. The thickness of the polytetrafluoroethylene protective plate can be 1-8 mm, and preferably 2-5 mm. According to a specific embodiment of the utility model, the thickness of polytetrafluoroethylene protection plate is 2 ~ 4 mm. The polytetrafluoroethylene protective plate with the thickness can reduce the friction coefficient of the surface of the flat-plate electromagnetic flow velocity sensor flowing through the open channel to the minimum, and cannot generate interference on the electrode. The polytetrafluoroethylene protection board is provided with a plurality of electrode holes which are respectively used for the plurality of electrodes to penetrate through the polytetrafluoroethylene protection board and then extend into the cavity. The spacing between adjacent electrode holes may be equal or unequal, and preferably, the spacing between adjacent electrode holes is equal. The equal interval between adjacent electrode holes can further reduce the interference between positive and negative electrodes, improve the measurement accuracy of open channel flow measurement. Preferably, after the opening at the upper end of the cavity is fastened and fixed with the polytetrafluoroethylene protection plate, the upper surface of the polytetrafluoroethylene protection plate is flush with the plane of the upper surface of the protection shell. Therefore, the whole water passing surface is ensured to be flat and smooth, interference ripples are not generated, and the measurement precision of open channel flow measurement is further improved.
The working principle of the flat-type electromagnetic flow rate sensor is described below.
The flat-plate electromagnetic flow velocity sensor realizes flow velocity measurement of the water body of the open channel through an electromagnetic induction principle. The electromagnetic coil generates a constant alternating magnetic field, when the open channel water body cuts magnetic lines of force through the magnetic field, induced electromotive force can be generated, under the condition that the magnetic field and a medium are not changed, the flow speed of the open channel water body is in direct proportion to the induced electromotive force, and the induced electromotive force generated by the electrode pair is sampled, so that the water flow speed of the open channel water body can be obtained.
< electromagnetic flow rate meter >
The utility model discloses an electromagnetic current meter is applicable to the water velocity of flow survey of arbitrary channel, and the preferred water velocity of flow that is applicable to lower open channel that plays the velocity of flow surveys. The electromagnetic current meter of the utility model comprises the flat plate type electromagnetic current sensor. The electromagnetic current meter of the utility model can also comprise a controller. A controller is provided to be able to control the flat plate type electromagnetic flow rate sensor. The controller may be connected to the flat plate type electromagnetic flow rate sensor through a cable. The electromagnetic flow rate meter is suitable for open channel flow measurement with low starting flow rate and can improve the measurement precision.
Example 1
Fig. 1 is an exploded view of the flat-plate electromagnetic flow velocity sensor of the present invention. Fig. 2 is a schematic structural diagram of an electrode according to the present invention. The flat-plate type electromagnetic flow velocity sensor comprises a protective shell 2, an electrode 1, an electromagnetic coil 3 and a polytetrafluoroethylene protective plate 4.
The electrode 1 comprises an electrode head 11, a transition portion 12 and an electrode rod 13 which are connected in sequence. The upper portion of the electrode tap 11 has an outwardly convex curved surface. The transition part 12 is of a circular truncated cone structure. The electrode rod 13 is of a cylindrical structure. The electrode 1 is formed using 316 stainless steel.
The electromagnetic coil 3 is formed by winding high-temperature enameled copper wires. The inner diameter of the electromagnetic coil 3 is 35mm, the outer diameter is 45mm, and the thickness is 35 mm.
The upper surface of the protective shell 2 is flat and approximately rectangular. The protective casing 4 is an integrally formed structure and is made of 316 stainless steel. The upper surface of the protective case 2 has a length of 600mm and a width of 400 mm. The four corners of the upper surface of the protective shell 2 are all connected in an arc shape. The four corners of the upper surface of the protective case 2 are respectively provided with mounting holes 24. The upper surface of the protective casing 2 is also provided with mounting holes 24 near the edges. The middle of the upper surface of the protective casing 2 is provided with an opening extending longitudinally downward to form a cavity 21. The cavity 21 is a rectangular parallelepiped structure. The opening at the upper end of the cavity is square. The depth of the cavity is 40 mm. The cavity 21 houses the electromagnetic coil 3 and the electrode 1. In the cavity 21, the gaps between the electromagnetic coil 3 and the electrode 1 are filled with epoxy resin to ensure that the internal structure is completely waterproof. One side of the cavity 21 is provided with 2 wire outlet holes 22 so that the cable connected to the electrode 1 is led out of the cavity 21. The bottom surface of the cavity 21 is provided with a glue filling hole 23. The opening at the upper end of the cavity 21 is matched and clamped and fixed with the polytetrafluoroethylene protective plate 4. After the clamping and fixing, the upper surface of the polytetrafluoroethylene protection plate 4 is flush with the plane of the upper surface of the protection shell 2.
The upper surface of the polytetrafluoroethylene protective sheet 4 is square. The polytetrafluoroethylene protective sheet 4 has a thickness of 3 mm. The polytetrafluoroethylene protective plate 4 is provided with an electrode hole. The electrode 1 penetrates through the polytetrafluoroethylene protection plate 4 through the electrode hole and then extends into the cavity 21. The spacing between adjacent electrode holes is equal. The number of the electrodes 1 in this embodiment is 3, and they are arranged in a linear shape.
The working principle of the flat-type electromagnetic flow rate sensor is described below.
The flat-plate electromagnetic flow velocity sensor realizes flow velocity measurement of the water body of the open channel through an electromagnetic induction principle. The electromagnetic coil 3 generates a constant alternating magnetic field, when the open channel water body cuts magnetic lines of force through the magnetic field, induced electromotive force can be generated, under the condition that the magnetic field and a medium are not changed, the flow speed of the open channel water body is in direct proportion to the induced electromotive force, and the generated induced electromotive force is sampled through the electrode 1, so that the water flow speed of the open channel water body can be obtained.
Example 2
An electromagnetic flow meter includes a controller (not shown) and a flat-plate type electromagnetic flow rate sensor shown in example 1. The controller is connected with the flat-plate type electromagnetic flow velocity sensor through a cable.
Example 3
The remaining components and connection relationships are the same as in embodiment 1, except for the following settings: the solenoid 3 has an inner diameter of 38mm, an outer diameter of 48mm and a thickness of 38 mm.
Example 4
The remaining components and connection relationships are the same as in embodiment 1, except for the following settings: the polytetrafluoroethylene protective sheet 4 has a thickness of 4 mm.
The present invention is not limited to the above embodiments, and any variations, modifications, and substitutions that may occur to those skilled in the art may be made without departing from the spirit of the present invention.
Claims (10)
1. A flat-plate electromagnetic flow velocity sensor is characterized by comprising a protective shell, a plurality of electrodes, an electromagnetic coil and a polytetrafluoroethylene protective plate;
the upper surface of the protective shell is flat; an opening is formed in the middle of the upper surface of the protective shell, and the opening extends downwards along the longitudinal direction to form a cavity;
the cavity is used for placing the electromagnetic coil and the plurality of electrodes;
the polytetrafluoroethylene protective plate is arranged to be capable of being clamped and fixed with the opening; the polytetrafluoroethylene protection plate is provided with a plurality of electrode holes for the plurality of electrodes to penetrate through the polytetrafluoroethylene protection plate and then extend into the cavity;
the plurality of electrodes are arranged in a linear manner.
2. A flat-plate electromagnetic flow rate sensor according to claim 1, wherein the electrode comprises an electrode tip, a transition portion and an electrode rod connected in sequence; the upper part of the electrode head is provided with an outward convex curved surface; the transition part is of a circular truncated cone structure; the electrode rod is of a cylindrical structure.
3. A flat-plate type electromagnetic flow velocity sensor according to claim 1, wherein the electromagnetic coil has an inner diameter of 25 to 45mm, an outer diameter of 35 to 55mm, and a thickness of 25 to 45 mm.
4. A flat-plate electromagnetic flow rate sensor according to claim 1, wherein the electromagnetic coil is wound with enameled wire.
5. A flat-plate electromagnetic flow rate sensor according to claim 1, wherein the teflon protective plate has a thickness of 1 to 8 mm.
6. A flat-plate type electromagnetic flow rate sensor according to claim 1, wherein in the cavity, gaps between the electromagnetic coil and the plurality of electrodes are filled with an insulating resin.
7. A flat plate electromagnetic flow rate sensor according to claim 6, wherein at least one outlet hole is provided on one side of the chamber.
8. A flat-plate electromagnetic flow rate sensor according to claim 7, wherein the bottom surface of the cavity is provided with a glue-pouring hole.
9. A flat-panel electromagnetic flow rate sensor according to claim 8, wherein the upper surface of the protective housing is provided with mounting holes near the edges.
10. An electromagnetic flow meter for open channel flow measurement, comprising a controller and a flat plate type electromagnetic flow rate sensor according to any one of claims 1 to 9; the controller is configured to control the flat plate type electromagnetic flow rate sensor.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920562830.1U CN209821232U (en) | 2019-04-24 | 2019-04-24 | Flat plate type electromagnetic flow velocity sensor and electromagnetic flow velocity meter for open channel flow measurement |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920562830.1U CN209821232U (en) | 2019-04-24 | 2019-04-24 | Flat plate type electromagnetic flow velocity sensor and electromagnetic flow velocity meter for open channel flow measurement |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112684206A (en) * | 2020-12-23 | 2021-04-20 | 北京航空航天大学 | Permanent magnet type surface flow field sensor and sensor array |
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2019
- 2019-04-24 CN CN201920562830.1U patent/CN209821232U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112684206A (en) * | 2020-12-23 | 2021-04-20 | 北京航空航天大学 | Permanent magnet type surface flow field sensor and sensor array |
| CN112684206B (en) * | 2020-12-23 | 2022-07-19 | 北京航空航天大学 | Permanent magnet type surface flow field sensor and sensor array |
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