CN215983249U

CN215983249U - Electromagnetic flowmeter and water heater circulating system

Info

Publication number: CN215983249U
Application number: CN202121580135.1U
Authority: CN
Inventors: 张陈诗; 秦刚; 黄启彬; 王瑞
Original assignee: Ningbo Fotile Kitchen Ware Co Ltd
Current assignee: Ningbo Fotile Kitchen Ware Co Ltd
Priority date: 2021-07-12
Filing date: 2021-07-12
Publication date: 2022-03-08
Anticipated expiration: 2031-07-12

Abstract

The utility model discloses an electromagnetic flowmeter and a water heater circulating system, wherein the electromagnetic flowmeter comprises: the device comprises a shell, a power part, a filtering part, a Hall element and a controller; the power part has magnetism, and fluid flowing through the shell sequentially flows through the power part and the filtering part; the Hall element is arranged on the outer side of the shell and corresponds to the power part, and the Hall element is used for detecting and generating a rotation signal of the power part; the controller is in communication connection with the Hall element and is used for receiving the rotation signal and converting the rotation signal into a flow signal. When the fluid pushes the power part to rotate, the power part has magnetism, and the Hall sensor can sense the rotating speed of the power part, so that the Hall sensor can generate a rotating signal to the controller, and the controller can calculate the flow of the fluid after receiving the rotating signal. The filter part of the electromagnetic flowmeter can well realize the filtration of the fluid. The electromagnetic flowmeter integrates the filtering function, and is convenient to install to the water heater.

Description

Electromagnetic flowmeter and water heater circulating system

Technical Field

The utility model relates to the field of flowmeters, in particular to an electromagnetic flowmeter and a water heater circulating system.

Background

Water heaters are common household hot water appliances. At the water inlet of a water heater, a filter screen and an electromagnetic flow meter are generally required to be arranged.

The water inlet valve of the water heater is generally provided with a filter screen, after the water heater is used for a long time, the filter screen needs to be taken out for cleaning, otherwise, the filter screen is blocked, the blocked filter screen can increase the resistance of a circulating system of the water heater, and the water can be polluted. In areas with poor water quality, the speed of the filter screen for accumulating impurities is higher, and the frequency of taking out and cleaning the filter screen is higher. The method of manually removing the screen and cleaning also affects the normal use of the water heater circulation system, i.e., the hot water in the water heater cannot be used during the cleaning process. Meanwhile, the method for manually taking out and cleaning the filter screen has high technical level requirements, a user generally cannot operate the method by himself, and professional technicians are required to take out and clean the filter screen, so that time and labor are wasted.

Referring to fig. 1, a fully automatic hydrodynamic continuous brushing filter 90 is shown. The filter 90 includes a housing 11 having a water inlet 91 and a water outlet 92, a cylindrical filter screen 94 is disposed in the housing 11, and a hydrodynamic brush shaft 95, a hydrodynamic impeller 96, a radial support rod 97, and a filter screen cleaning brush 98 are disposed in the cylindrical filter screen 94. When water enters the tubular filter screen 94 from the water inlet pipe orifice, the hydrodynamic impeller 96 starts to drive the hydrodynamic brush shaft 95 to rotate under the action of flowing water, the hydrodynamic brush shaft 95 drives the radial support rod 97 to rotate, so that the filter screen cleaning brush 98 is driven to rotate, and the rotary filter screen cleaning brush 98 cleans the tubular filter screen 94. Since the filter cleaning brush 98 of the filter 90 continuously brushes the filter, resistance to water flow is inevitably increased. In addition, the filter screen cleaning brush 98 is inevitably worn during use, the water is polluted by the impurities generated by the wear, and the polluted water may damage the health of the user. As the filter screen cleaning brush 98 is worn, the problem of how to replace the filter screen cleaning brush 98 is still faced, and the use cost is high.

In addition, the blowoff valve 99 must be manually opened to discharge the washed foreign substances, which is complicated.

The electromagnetic flowmeter measures the flow of conducting fluid based on the electromotive force induced when the conducting fluid passes through external magnetic field by means of electromagnetic induction principle. At present, an electromagnetic flow meter and a filter screen are often arranged at a water inlet of a water heater independently, the structure is complex, and the water heater is inconvenient to assemble.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the defect that the water inlet of a water heater in the prior art needs to be respectively provided with an electromagnetic flowmeter and a filter screen, and the water heater circulating system is complex in structure.

The utility model solves the technical problems through the following technical scheme:

an electromagnetic flow meter, comprising: the device comprises a shell, a filtering part, a Hall element and a controller, wherein the filtering part is arranged in the shell; the power part is magnetic and is arranged in the shell; the fluid flowing through the shell sequentially flows through the power part and the filtering part; the Hall element is arranged on the outer side of the shell and corresponds to the power part, and the Hall element is used for detecting and generating a rotation signal of the power part; the controller is in communication connection with the Hall element and is used for receiving the rotation signal and converting the rotation signal into a flow signal.

In this scheme, through adopting above structure, when fluid promotion power portion rotates, because power portion has magnetism, hall sensor can sense power portion slew velocity to hall sensor can take place the rotation signal to the controller, can calculate fluidic flow after the controller receives the rotation signal. The electromagnetic flowmeter is also provided with a filtering part, and the filtering part can well realize the filtering of the fluid. The electromagnetic flowmeter integrates the filtering function, is convenient to install on the water heater, and has a relatively simple structure, and is convenient and reliable to use.

Preferably, the power unit includes an impeller assembly and a transmission shaft, the impeller assembly is disposed on the transmission shaft, the impeller assembly has magnetism, the hall element is disposed corresponding to the impeller assembly, and fluid flowing through the casing pushes the impeller assembly to rotate.

Preferably, the impeller assembly includes a guide impeller and a driving impeller, the guide impeller is fixedly disposed inside the housing, the guide impeller is configured to guide a direction of fluid flow, an end of the transmission shaft is rotatably connected to the guide impeller, the driving impeller is fixedly disposed on the transmission shaft, the driving impeller is configured to drive the transmission shaft to rotate, the driving impeller is magnetic, and the hall element is disposed corresponding to the driving impeller.

Preferably, the electromagnetic flow meter further comprises: the cleaning part, the differential pressure deformation part and the first linkage part and the second linkage part are correspondingly arranged;

the cleaning part is arranged in the filtering part;

the first linkage part is connected with the power part; the second linkage part is connected with the cleaning part;

the pressure difference deformation part is arranged on the filtering part; the differential pressure deformation part moves under the action of the differential pressure between the fluid pressure in the filtering part and the fluid pressure outside the filtering part so as to switch the cleaning part between a rotating state and a stopping state;

when the cleaning part is in the rotating state, the pressure difference deformation part drives the first linkage part and the second linkage part to be in transmission connection, and the power part drives the cleaning part to rotate through the first linkage part and the second linkage part;

when the cleaning part is in the stop state, the pressure difference deformation part drives the first linkage part and the second linkage part to be separated.

Preferably, the pressure difference deformation part is connected to the second linkage part, and the pressure difference deformation part pushes the second linkage part to be close to or far away from the first linkage part, so that the cleaning part is switched between a rotating state and a stopping state.

Preferably, the pressure difference deformation part is a diaphragm, the diaphragm is arranged at the bottom of the filtering part, the diaphragm is connected to the second linkage part, and the diaphragm pushes the second linkage part to be close to or far away from the first linkage part, so that the cleaning part is switched between a rotating state and a stopping state.

Preferably, the cleaning part comprises a jet element, the power part drives the jet element to rotate, the jet element acts on fluid in a rotating mode so that the fluid washes the filtering part, and the second linkage part is connected to the jet element.

Preferably, the jet member includes a barrel body, a plurality of through holes are formed in a side wall of the barrel body, the fluid flows out of the through holes, and the second linkage portion is connected to the bottom of the barrel body.

Preferably, the through holes are arranged at intervals along the circumferential direction of the barrel body; and/or the through holes are arranged at intervals along the axial direction of the barrel body; and/or the axis of the through hole is collinear with the straight line where the radius of the barrel body is located at the corresponding position.

A water heater circulation system comprises a water heater and the electromagnetic flow meter, wherein the electromagnetic flow meter is connected to a water inlet of the water heater.

On the basis of the common knowledge in the field, the above preferred conditions can be combined randomly to obtain the preferred embodiments of the utility model.

The positive progress effects of the utility model are as follows:

when the fluid pushes the power part to rotate, the power part has magnetism, and the Hall sensor can sense the rotating speed of the power part, so that the Hall sensor can generate a rotating signal to the controller, and the controller can calculate the flow of the fluid after receiving the rotating signal. The electromagnetic flowmeter is also provided with a filtering part, and the filtering part can well realize the filtering of the fluid. The electromagnetic flowmeter integrates the filtering function, is convenient to install on the water heater, and has a relatively simple structure, and is convenient and reliable to use.

Drawings

Fig. 1 is a schematic structural diagram of a full-automatic hydrodynamic continuous brushing filter in the prior art.

Fig. 2 is an external view of an electromagnetic flowmeter according to a preferred embodiment of the present invention.

Fig. 3 is a sectional view of the electromagnetic flowmeter of fig. 2, in which the cleaning section is in a rotated state.

Fig. 4 is a schematic structural view of a cross section of the electromagnetic flowmeter of fig. 2, in which the cleaning section is in a stopped state.

Figure 5 is an enlarged partial schematic view of the electromagnetic flowmeter of figure 4,

fig. 6 is a schematic structural view of a cross section of the electromagnetic flowmeter of fig. 2, in which the cleaning portion is in a rotated state.

Figure 7 is an enlarged partial schematic view of the electromagnetic flowmeter of figure 6,

fig. 8 is a schematic structural diagram of a portion of the components of the electromagnetic flowmeter of fig. 2.

Fig. 9 is a schematic view of a first flow restriction of the electromagnetic flow meter of fig. 8.

Fig. 10 is a schematic diagram of a second flow restriction of the electromagnetic flow meter of fig. 8.

Description of reference numerals:

filter 90

Water inlet 91

Water outlet 92

Housing 93

Cylindrical filter screen 94

Hydrodynamic brush shaft 95

Hydrodynamic impeller 96

Radial support bar 97

Filter screen cleaning brush 98

Blowoff valve 99

Electromagnetic flowmeter 100

Housing 11

Inlet 12

An outlet 13

Drain outlet 14

Rivet 15

Filter part 20

Filter screen 21

Power section 30

Impeller assembly 31

Drive shaft 32

Guide vane wheel 33

Drive impeller 34

Cleaning part 40

Fluidic member 41

Barrel 42

Accommodating groove 422

Circumferential stopper 43

Stop ring 431

Support 432

First flow restriction 44

First current limiting plate 441

Second flow restriction 45

Second restrictor plate 451

Connecting ring 46

Differential pressure deformation part 50

Diaphragm 51

First linkage portion 60

Convex surface 61

Concave surface 62

Second linkage part 70

Accommodating chamber 71

Connecting plate 72

Inverted cylinder 73

Blowoff valve assembly 80

Link rod 81

Thin plate 811

Wedge block 812

Barrier 82

Abutting column 821

Plugging plate 822

Drive spring 83

First sliding surface 84

Second sliding surface 85

Detailed Description

The present invention will be more clearly and completely described below by way of examples in conjunction with the accompanying drawings, but the present invention is not limited thereto.

As shown in fig. 2 to 10, the present embodiment is an electromagnetic flowmeter 100, including: the device comprises a shell 11, a filter part 20, a Hall element and a controller, wherein the filter part 20 is arranged in the shell 11; a power unit 30, wherein the power unit 30 has magnetism, and the power unit 30 is arranged in the shell 11; the fluid flowing through the housing 11 flows through the power part 30 and the filter part 20 in sequence; the Hall element is arranged on the outer side of the shell 11, the Hall element is arranged corresponding to the power part 30, and the Hall element is used for detecting and generating a rotation signal of the power part 30; the controller is in communication connection with the Hall element and is used for receiving the rotation signal and converting the rotation signal into a flow signal. When the fluid pushes the power part 30 to rotate, the hall sensor can sense the rotating speed of the power part 30 because the power part 30 has magnetism, so that the hall sensor can generate a rotating signal to the controller, and the controller can calculate the flow of the fluid after receiving the rotating signal. The electromagnetic flowmeter 100 is further provided with a filter unit 20, and the filter unit 20 can favorably filter the fluid. The electromagnetic flowmeter 100 integrates the filtering function, is convenient to install on a water heater, and has the advantages of relatively simple structure, convenient use and reliability. The hall element and controller are not shown.

The power unit 30 includes an impeller assembly 31 and a transmission shaft 32, the impeller assembly 31 is disposed on the transmission shaft 32, the impeller assembly 31 has magnetism, the hall element is disposed corresponding to the impeller assembly 31, and the fluid flowing through the housing 11 pushes the impeller assembly 31 to rotate.

The impeller assembly 31 includes a guide impeller 33 and a driving impeller 34, the guide impeller 33 is fixedly disposed inside the housing 11, the guide impeller 33 is used for guiding a flow direction of the fluid, an end of the transmission shaft 32 is rotatably connected to the guide impeller 33, the driving impeller 34 is fixedly disposed on the transmission shaft 32, the driving impeller 34 is used for driving the transmission shaft 32 to rotate, the driving impeller 34 has magnetism, and the hall element is disposed corresponding to the driving impeller 34.

In fig. 2 to 10, the present embodiment is an electromagnetic flowmeter 100, including: the device comprises a shell 11, a filtering part 20, a power part 30 and a cleaning part 40, wherein the filtering part 20 is arranged in the shell 11; the power part 30 is arranged in the shell 11, and the power part 30 drives the cleaning part 40 to rotate under the pushing of the fluid; the cleaning part 40 is arranged in the filter part 20, and the cleaning part 40 is used for washing the filter part 20; the electromagnetic flow meter 100 further includes: the differential pressure deformation part 50 and the first linkage part 60 and the second linkage part 70 which are correspondingly arranged; the first linkage portion 60 is connected with the power portion 30; the second linkage portion 70 is connected to the cleaning portion 40; the differential pressure deformation part 50 is arranged on the filter part 20; the differential pressure deformation part 50 moves under the action of the differential pressure between the fluid pressure inside the filter part 20 and the fluid pressure outside the filter part 20, so that the cleaning part 40 is switched between a rotating state and a stopping state; when the cleaning part 40 is in a rotating state, the pressure difference deformation part 50 drives the first linkage part 60 and the second linkage part 70 to be in transmission connection, and the power part 30 drives the cleaning part 40 to rotate through the first linkage part 60 and the second linkage part 70; when the cleaning part 40 is in a stopped state, the differential pressure deformation part 50 urges the first interlocking part 60 and the second interlocking part 70 to be separated from each other.

When the filtering portion 20 is not blocked, the pressure difference received by the pressure difference deformation portion 50 is small, the pressure difference deformation portion 50 drives the first linkage portion 60 and the second linkage portion 70 to be separated, and the power portion 30 stops driving the cleaning portion 40 to rotate, so that the blockage of the cleaning portion 40 to the fluid flow is reduced, and the fluid resistance is reduced. When the filtering part 20 is blocked, the pressure difference borne by the pressure difference deformation part 50 is large, the pressure difference deformation part 50 drives the first linkage part 60 and the second linkage part 70 to be in transmission connection, and the power part 30 drives the cleaning part 40 to rotate, so that the cleaning of the filtering part 20 is completed.

The electromagnetic flowmeter 100 may be used for filtering a fluid, which is generally a liquid, such as tap water, or the like, but may be a gas.

As an embodiment, the differential pressure deformation part 50 is connected to the second linkage part 70, and the differential pressure deformation part 50 pushes the second linkage part 70 to approach or separate from the first linkage part 60 to switch the cleaning part 40 between the rotation state and the stop state. The present embodiment can simplify the structural form of the electromagnetic flowmeter 100, and improve stability and reliability. In other embodiments, the differential pressure deformation may not be connected to the first linkage portion 60, and the related components need to be adjusted.

In the present embodiment, the first linkage portion 60 has a convex surface 61, the second linkage portion 70 has a concave surface 62 corresponding to the convex surface 61, and the first linkage portion 60 and the second linkage portion 70 engage with the concave surface 62 through the convex surface 61 to realize the transmission connection. Of course, the first linkage portion 60 may also have a concave surface 62, the second linkage portion 70 has a convex surface 61 corresponding to the concave surface 62, and the first linkage portion 60 and the second linkage portion 70 engage with the convex surface 61 through the concave surface 62 to realize the transmission connection. The present embodiment can efficiently switch between the transmission connection and the disconnection between the first interlocking part 60 and the second interlocking part 70.

As shown in fig. 8, the cross-section of the convex surface 61 and the cross-section of the concave surface 62 become larger in the direction in which the fluid flows into the cleaning portion 40. The larger the pressure difference is, the larger the contact area between the second linkage part 70 and the first linkage part 60 driven by the pressure difference deformation part 50 is, so that the transmission connection can be realized more reliably, and the cleaning efficiency of the cleaning part 40 is improved.

In fig. 8, the second interlocking part 70 further includes a receiving cavity 71, the first interlocking part 60 is inserted into the receiving cavity 71, and a top surface inside the receiving cavity 71 is provided with a convex surface 61 or a concave surface 62. The accommodating cavity 71 can better improve the reliability of two transmission connections and avoid accidental disengagement.

In fig. 8, the second interlocking part 70 further includes a connecting plate 72, and the receiving chamber 71 is connected to the washing part 40 through the connecting plate 72. This embodiment can improve flexibility in the position between the washing part 40 and the second linkage part 70.

The housing chamber 71 is detachably connected to the connecting plate 72; so that the installation of the first interlocking part 60 can be facilitated.

The accommodating cavity 71 may be specifically an inverted cylinder 73, a top surface of the inverted cylinder 73 is provided with a convex surface 61 or a concave surface 62, the first linkage portion 60 is inserted into the inverted cylinder 73, and a bottom of the inverted cylinder 73 is connected to the connecting plate 72. The inverted cylinder 73 can simplify the structural form of the housing chamber 71.

In other embodiments, the first and second linkage portions 60 and 70 may have other configurations, such as cooperating cross heads and cross recesses, and cooperating friction surfaces that are capable of transmitting torque between each other and variably engaging and disengaging when in contact.

As shown in fig. 2 to 8, the differential pressure deformation part 50 is a diaphragm 51, the diaphragm 51 is disposed at the bottom of the filter part 20, the diaphragm 51 is connected to the second linkage part 70, and the diaphragm 51 pushes the second linkage part 70 to be close to or away from the first linkage part 60, so that the cleaning part 40 is switched between a rotation state and a stop state. The diaphragm 51 is simple in structure and easy to install, and reliably pushes the second linkage portion 70 to approach or separate from the first linkage portion 60. In other embodiments, the differential pressure deformation portion 50 may also be made of other structures, such as other materials with elasticity, or a combination of an elastic member and a plate member, which only needs to be deformed under the action of the differential pressure to push the first linking portion 60.

Specifically, the diaphragm 51 has a circular shape, and the second interlocking part 70 is connected to the center of the circular diaphragm 51. The present embodiment can increase the displacement of the second linkage portion 70, and improve the reliability of the transmission connection with the first linkage portion 60.

In one embodiment, the specific material of the membrane 51 may be an organic membrane, an inorganic membrane, or a composite membrane formed by combining a plurality of materials. The diaphragm 51 only needs to be deformable under the action of the pressure difference, so that the first linkage portion 60 is pushed.

As shown in fig. 7-8, the cleaning part 40 includes a fluidic member 41, the power part 30 drives the fluidic member 41 to rotate, the rotational fluidic member 41 acts on the fluid to flush the filtering part 20, and the second coupling part 70 is connected to the fluidic member 41. The rotating jet member 41 generates a jet which impacts the foreign matter of the filter house 20, thereby completing the cleaning of the filter house 20. The use of the filter screen cleaning brush 98 is also avoided, the contamination of the fluid by the filter screen cleaning brush 98 is avoided, and the replacement of the filter screen cleaning brush 98 is further avoided. A jet is understood to be a column of fluid which, like an ejected arrow, cleans the filter house 20 well.

In this embodiment, the fluidic member 41 includes a barrel 42, a plurality of through holes are formed on a sidewall of the barrel 42, the fluid flows out of the through holes, and the second linkage portion 70 is connected to a bottom of the barrel 42. The through-holes can generate a jet flow, thereby efficiently achieving cleaning of the filter portion 20. In other embodiments, fluidic piece 41 may be prismatic, cubic, or the like. The position and shape of the through holes are not shown, and as a specific embodiment, the through holes may be circular holes, triangular holes, quadrilateral holes, and the like. The specific shape of the through-hole is not shown in fig. 7. As an embodiment, the cross-sectional area of the through holes may be set according to the size of the filter screen 21 of the filter part 20, for example, the diameter of the through holes may be 3 to 6 times the diameter of the meshes of the filter screen 21.

In one embodiment, the through holes are spaced along the circumference of the barrel 42; the through holes can also be arranged at intervals along the axial direction of the barrel body 42; the axis of the through hole is collinear with a line on which the radius of the tub 42 at the corresponding position is located. This embodiment can be more multi-angle, the omnidirectional realization is to the washing of filter house 20.

As shown in fig. 4 to 7, the electromagnetic flowmeter 100 further includes a circumferential limiting portion 43, and the barrel 42 is rotatably connected to the housing 11 through the circumferential limiting portion 43. This embodiment can avoid staving 42 at the circumferential rocking of rotation in-process, noise abatement, improvement stability.

As a specific embodiment, the circumferential position-limiting portion 43 includes a position-limiting ring 431 and a plurality of supporting members 432, the position-limiting ring 431 is connected to the housing 11 through the supporting members 432, and the barrel 42 is clamped in the position-limiting ring 431. This embodiment simple structure realizes high-efficiently that circumference is spacing.

As shown in fig. 4-7, the electromagnetic flowmeter 100 further includes a first flow-limiting element 44 and a second flow-limiting element 45 correspondingly disposed, the first flow-limiting element 44 is connected to the inner side surface of the housing 11, and the first flow-limiting element 44 is disposed between the electromagnetic flowmeter 100 and the barrel 42; the second flow restriction 45 is rotatably connected to the outer side surface of the tub 42; when the washing part 40 is rotated, the second restriction 45 is engaged with the first restriction 44 to allow the fluid to flow to the electromagnetic flow meter 100 through the tub 42. This embodiment can improve the flow that flows through staving 42, and then improves fluidic intensity, improves the cleaning performance.

As a specific embodiment, the first flow restriction 44 includes a plurality of first flow restriction plates 441 arranged at intervals, and the first flow restriction plates 441 are transversely disposed between the electromagnetic flow meter 100 and the barrel 42; the second flow restriction member 45 includes a plurality of second flow restriction plates 451, and the second flow restriction plates 451 are connected to the outer side of the barrel 42; when the washing part 40 is rotated, the second restriction plate 451 closes the gap between the first restriction plates 441, so that the fluid flows toward the electromagnetic flowmeter 100 through the tub 42. This embodiment simple structure blocks the interval high-efficiently, makes fluid inflow staving 42, improves fluidic intensity, improves the cleaning performance.

As shown in fig. 9 and 10, preferably, the outer side surface of the first current-limiting plate 441 is attached to the inner side surface of the housing 11, and the inner side surface of the first current-limiting plate 441 is attached to the outer side surface of the barrel 42; the outer side surface of the second current limiting plate 451 is attached to the inner side surface of the housing 11, the inner side surface of the second current limiting plate 451 is attached to the outer side surface of the barrel 42, and both side surfaces of the second current limiting plate 451 are attached to the corresponding first current limiting plates 441 at intervals. The embodiment plugs the interval efficiently, promotes the fluid to flow into the barrel body 42, improves the strength of jet flow, and improves the cleaning effect.

In fig. 10, the electromagnetic flow meter 100 further includes a coupling ring 46, the second restrictor plate 451 is coupled to the coupling ring 46 at an inner side thereof, and the barrel 42 is rotatably coupled to the coupling ring 46. This embodiment can improve the installation efficiency of the second restriction plate 451.

As shown in fig. 8, the barrel 42 has a receiving groove 422 on an outer circumferential surface thereof, and the connecting ring 46 is disposed in the receiving groove 422. This embodiment can improve the reliability of the attachment ring 46.

The first flow restriction 44 also serves to restrict the range in which the second flow restriction 45 moves along the axis of the tub 42 when the washing part 40 is in a rotated state. The embodiment can avoid overlarge moving range and improve the reliability.

As shown in fig. 5-10, the first current limiting plate 441 of the present embodiment includes a limiting ring 431 in the middle and 4 arc plates extending outward from the limiting ring 431, and 4 intervals are formed between the 4 arc plates. The second current-limiting plate 451 comprises a connecting ring 46 located in the middle and 4 arc-shaped plates extending outward from the connecting ring 46 and matching with the interval, and the connecting ring 46 of the second current-limiting plate 451 is rotatably clamped in the containing groove 422 of the barrel 42. The second choke plate 451 is movable with the barrel 42 in the axial direction thereof. The second current limiting plate 451 may be clamped in the space of the first current limiting plate 441, so as to form a barrier, prevent fluid from flowing in from the gap between the barrel 42 and the filter 20, and allow fluid to flow out from the barrel 42 as much as possible, thereby improving the strength of the jet flow and improving the cleaning effect.

In the present embodiment, the screen of the filter unit 20 is a cylindrical screen, and the axis of the tub 42 is collinear with the axis of the cylindrical screen. The filter mesh 21 of the cylindrical filter mesh is cylindrical, and the present embodiment can improve the effect of cleaning the filter portion 20.

As shown in fig. 3-5, the electromagnetic flow meter 100 further comprises a waste valve assembly 80, the housing 11 is provided with a waste outlet 14, and the waste outlet 14 passes through the side wall of the housing 11 from the filtering portion 20; the sewage valve assembly 80 comprises a linkage rod 81, a blocking piece 82 and a driving spring 83; one end of the linkage rod 81 is connected with the diaphragm 51, the other end of the linkage rod 81 abuts against the blocking piece 82, the blocking piece 82 is used for blocking the sewage discharge port 14, and the spring is arranged between the blocking piece 82 and the shell 11; when the cleaning part 40 is in a rotating state, the diaphragm 51 drives the linkage rod 81 to move away from the blocking member 82, and the spring pushes the blocking member 82 to move away from the sewage draining outlet 14, so that the fluid flows out of the sewage draining outlet 14. The embodiment can automatically realize the discharge of impurities and improve the practicability of the electromagnetic flowmeter 100. And the normal use of the electromagnetic flow meter 100 is not affected during the impurity discharging process.

In fig. 4, one end of the linkage rod 81 facing the blocking member 82 is provided with a first sliding surface 84, one end of the blocking member 82 facing the linkage rod 81 is provided with a second sliding surface 85 corresponding to the first sliding surface 84, and when the cleaning part 40 is in a rotating state, the first sliding surface 84 slides relative to the second sliding surface 85, so that the linkage rod 81 is far away from the blocking member 82. This embodiment can improve the stability and reliability of opening stopper 82.

As an embodiment, the linkage rod 81 may include a thin plate 811 and a first sliding surface 84 facing the blocking member 82, and the first sliding surface 84 may be disposed on a wedge-shaped block 812 as shown in fig. 4. The blocking member 82 may include a blocking plate 822 and an abutting pillar 821, the second sliding surface 85 may be disposed at an end of the abutting pillar 821, and both the first sliding surface 84 and the second sliding surface 85 are inclined surfaces and can slide relative to each other when they contact each other. The blocking plate 822 is used for blocking the sewage discharge port 14. The sewage draining port 14 may be a double-layer pipe as shown in fig. 4, the driving spring 83 is sleeved outside the inner-layer pipe, the driving spring 83 abuts between the blocking plate 822 and the housing 11, when the wedge-shaped block moves downwards under the driving of the linkage rod 81, the driving spring 83 pushes the blocking member to be away from the sewage draining port 14, so that fluid and impurities can flow out from the sewage draining port 14. As an embodiment, the waste outlet 14 may be externally connected to a waste pipe.

As an embodiment, as shown in fig. 4 and 6, the linkage rod 81 is located between the diaphragm 51 and the barrel 42, and the diaphragm 51, the linkage rod 81 and the barrel 42 can be connected by a rivet 15, and the three can rotate relative to the rivet 15.

In one embodiment, the power unit 30 includes an impeller assembly 31 and a transmission shaft 32, the impeller assembly 31 is disposed at one end of the transmission shaft 32, and the other end of the transmission shaft 32 is disposed with the first linkage unit 60. This embodiment simple structure can wash raises the efficiency.

As shown in fig. 3 and 5, the impeller assembly 31 includes a guide impeller 33 and a driving impeller 34, the guide impeller 33 is fixedly disposed inside the casing 11, the guide impeller 33 is used for guiding the flow direction of the fluid, the end of the transmission shaft 32 is rotatably connected to the guide impeller 33, the driving impeller 34 is fixedly disposed on the transmission shaft 32, and the driving impeller 34 is used for driving the transmission shaft 32 to rotate. This embodiment can further improve the cleaning efficiency.

The embodiment can also be a water heater circulation system, which comprises a water heater and the electromagnetic flow meter 100, wherein the electromagnetic flow meter 100 is connected to the water inlet 91 of the water heater. This embodiment can avoid impurity to get into the water heater, can also reduce the use cost of water heater circulation system.

Referring now to fig. 2-10, the fluid is selected to be tap water, and the arrows in the figures indicate the flow direction of the fluid, to briefly describe the operation of the electromagnetic flowmeter 100.

Tap water flows into the housing 11 from the inlet and drives the impeller assembly 31 to rotate. The tap water continues to flow into the filter unit 20, passes through the strainer 21, and then flows to the outlet 13.

Normally, when filter screen 21 is not blocked, only impeller assembly 31 rotates, and barrel 42 does not rotate. The waste valve assembly 80 is in a closed state. As shown in fig. 5 and 6.

If the filter screen 21 is blocked, the pressure difference between the two sides of the membrane 51 is increased, so that the membrane 51 deforms and moves downwards, as shown in fig. 3 and 4, so as to drive the barrel 42 to move downwards, the second linkage part 70 is in transmission connection with the first linkage part 60, and the impeller assembly 31 drives the barrel 42 to rotate, so as to generate jet flow to clean the filter part 20. Meanwhile, the linkage rod 81 moves downwards, and the blocking piece is far away from the sewage discharge port 14 under the action of the driving spring 83, so that the sewage discharge port 14 is opened, and fluid and impurities can flow out of the sewage discharge port 14.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.

While specific embodiments of the utility model have been described above, it will be appreciated by those skilled in the art that this is by way of example only, and that the scope of the utility model is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and scope of the utility model, and these changes and modifications are within the scope of the utility model.

Claims

1. An electromagnetic flow meter, characterized in that it comprises:

a housing;

the filtering part is arranged in the shell;

the power part is magnetic and is arranged in the shell;

the fluid flowing through the shell sequentially flows through the power part and the filtering part;

the Hall element is arranged on the outer side of the shell and corresponds to the power part, and the Hall element is used for detecting and generating a rotation signal of the power part;

and the controller is in communication connection with the Hall element and is used for receiving the rotation signal and converting the rotation signal into a flow signal.

2. The electromagnetic flow meter of claim 1, wherein the power section includes an impeller assembly and a drive shaft, the impeller assembly being disposed on the drive shaft, the impeller assembly being magnetic, the hall element being disposed in relation to the impeller assembly, the impeller assembly being rotated by fluid flowing through the housing.

3. The electromagnetic flow meter according to claim 2, wherein the impeller assembly comprises a guide impeller and a driving impeller, the guide impeller is fixedly arranged in the housing, the guide impeller is used for guiding the flow direction of the fluid, the end of the driving shaft is rotatably connected to the guide impeller, the driving impeller is fixedly arranged on the driving shaft, the driving impeller is used for driving the driving shaft to rotate, the driving impeller is magnetic, and the hall element is arranged corresponding to the driving impeller.

4. The electromagnetic flow meter of claim 1, further comprising: the cleaning part, the differential pressure deformation part and the first linkage part and the second linkage part are correspondingly arranged;

the cleaning part is arranged in the filtering part;

5. The electromagnetic flow meter according to claim 4, wherein the differential pressure deformation portion is connected to the second linkage portion, and the differential pressure deformation portion pushes the second linkage portion closer to or farther from the first linkage portion to switch the cleaning portion between a rotation state and a stop state.

6. The electromagnetic flowmeter of claim 4, wherein said differential pressure deformation portion is a diaphragm provided at a bottom of said filter portion, said diaphragm being connected to said second linkage portion, said diaphragm pushing said second linkage portion toward or away from said first linkage portion to switch said cleaning portion between a rotation state and a stop state.

7. The electromagnetic flowmeter of claim 4 wherein said cleaning portion comprises a fluidic member, said motive portion rotationally driving said fluidic member, said fluidic member rotationally acting on the fluid to cause the fluid to flush said filter portion, said second linkage portion coupled to said fluidic member.

8. The electromagnetic flowmeter of claim 7, wherein said fluidic element comprises a barrel having a sidewall with a plurality of apertures therethrough from which fluid flows, said second linkage being attached to a bottom of said barrel.

9. The electromagnetic flow meter of claim 8, wherein the through holes are spaced circumferentially of the bucket body;

and/or the through holes are arranged at intervals along the axial direction of the barrel body;

and/or the axis of the through hole is collinear with the straight line where the radius of the barrel body is located at the corresponding position.

10. A water heater circulation system, characterized in that it comprises a water heater and an electromagnetic flow meter according to any one of claims 1-9, connected to the water inlet of said water heater.