CN115536203A

CN115536203A - Magnetic filter

Info

Publication number: CN115536203A
Application number: CN202211207301.2A
Authority: CN
Inventors: 吴剑斌; 覃晶晶
Original assignee: Jiangxi Avonflow Heating Ventilation Technology Co ltd
Current assignee: Jiangxi Avonflow Heating Ventilation Technology Co ltd
Priority date: 2022-09-30
Filing date: 2022-09-30
Publication date: 2022-12-30
Anticipated expiration: 2042-09-30

Abstract

A magnetic filter, comprising: the cylinder body is connected with the plurality of channels; the blowoff valve is connected to the lower part of the cylinder body and communicated with the cavity; the filter screen is fixed in the cavity and can not rotate; the outer filter screen is coaxially sleeved outside the inner filter screen, the lower part of the outer filter screen is provided with a bending part, and convex teeth are circumferentially arranged on the bending part; the driving teeth are meshed with the convex teeth; one end of the rotating shaft is connected with the driving gear in a non-rotating way, and the other end of the rotating shaft penetrates through the cylinder body to the outside of the cylinder body; the rotary marking cap is connected to one end of the rotating shaft outside the cylinder body in a non-rotary mode; the controllable magnetic bar component controls the intensity of the magnetic field in the cavity through heating. The invention is provided with two layers of filter screens, controls the dislocation of the two layers of filter screens by an external rotary marking cap, isolates a controllable magnetic bar component from a heating and ventilation system, and realizes the cleaning of impurities under the condition of not disassembling the magnetic filter by heating by utilizing the magnetic transformation characteristic of a permanent magnet at the Curie point, and removes magnetic impurities and non-magnetic impurities at one time.

Description

Magnetic filter

Technical Field

The invention relates to the field of magnetic filters, in particular to a magnetic filter.

Background

The magnetic filter is installed at the front end of the water replenishing valve of the wall-mounted furnace, is used for taking charge of circulation of water in a heating system, and has certain corrosivity on the inner walls of heating radiators and pipelines due to the fact that the water contains impurities and has certain weak acidity. The magnetic filter has the characteristics of small volume, light weight, convenient installation and operation and the like.

At present, most radiators used in the market are made of cast iron, sand mold residues and other impurities in the radiators cannot be completely washed when in engineering installation, water in a heating system is always in closed circulation, a filter screen is not arranged at a heating part of a boiler, therefore, corrosion residues in the radiators and pipelines and impurities in the water can enter the heat exchanger again through a circulating water pump of the wall-mounted boiler, the impurities can be continuously decomposed under the high-temperature condition, and then a part of the impurities becomes water scales to be attached to the inner wall of the heat exchanger, and the pipe diameter is gradually thinned for a long time. Finally, the pipe diameter is reduced, the flow speed and the runoff of fluid water are changed, the load of the circulating water pump is further increased, the rotating speed of the circulating water pump of the wall-mounted boiler is reduced even the circulating water pump is blocked after long-term operation, and the service life of the wall-mounted boiler is seriously influenced.

In the prior art, a universal magnetic filter for a wall-hanging stove disclosed in publication No. CN111423048a is provided with a filter screen to intercept non-magnetic impurities in a fluid, and for magnetic impurities with a small volume, a magnetic component in the filter screen is used to adsorb the magnetic impurities, and after the magnet is filled with iron impurities, if the magnet is not cleaned in time, the adsorption effect of the magnet is affected. However, magnetic components in the prior art are permanent magnets, a magnetic field exists permanently, magnetic impurities are attached to the surface of the permanent magnets all the time, the cylindrical permanent magnets need to be taken out integrally during cleaning, the adsorbed magnetic impurities are scraped and then installed back into the cylindrical bodies, the cleaning process is complex, repeated disassembly causes the sealing performance of the magnetic filter to be reduced, and accordingly, the external gas of the magnetic filter enters the inner cavity of the magnetic filter, oxidation corrosion of pipelines is accelerated, and the pressure and risk of a heating and ventilation system are increased.

Disclosure of Invention

The present invention is made in view of the problems raised by the background art, and the present invention will be further described below.

A magnetic filter, comprising:

the inner part of the cylinder is a cavity, the top of the cylinder is provided with a connecting pipe, and an inner pipe communicated with the cavity is arranged in the connecting pipe;

the inner wall of the multi-way is provided with a flow guide wall, two adjacent connecting ends of the multi-way are communicated and respectively used as a water inlet end and a side outlet end, the side outlet end is connected with a connecting pipe, the end part of the inner pipe extends into the flow guide wall and is matched with the flow guide wall, and a return channel is formed between the flow guide wall and the inner wall of the side outlet end of the multi-way;

the blowoff valve is connected to the lower part of the cylinder body and communicated with the cavity;

the inner filter screen is fixed in the cavity and can not rotate;

the outer filter screen is coaxially sleeved outside the inner filter screen, the lower part of the outer filter screen is provided with a bending part, and convex teeth are circumferentially arranged on the bending part;

the driving teeth are meshed with the convex teeth;

one end of the rotating shaft is connected with the driving gear in a non-rotating way, and the other end of the rotating shaft penetrates through the cylinder body to the outside of the cylinder body;

the rotary marking cap is connected to one end of the rotating shaft outside the cylinder body in a non-rotary mode;

the controllable magnetic bar component controls the intensity of the magnetic field in the cavity through heating.

Preferably, the controllable magnetic bar assembly comprises:

the control head is fixed on the cylinder body, is internally provided with a control component and is used for controlling the heating state of the heating rod;

the permanent magnets are annular and are isolated by spacer rings;

a protective sleeve isolating the interior of the protective sleeve from external fluid;

the heating rod generates heat after being electrified, and the temperature of the inner cavity of the permanent magnet is heated to be above the Curie point.

Preferably, the bottom of the cylinder body is provided with a step-shaped bearing platform, the top of the cylinder body is provided with a cylinder pressing part extending to the cavity, and the end part of the cylinder pressing part is provided with a step structure; the top of the inner filter screen is provided with a U-shaped bending part, the U-shaped bending part is contacted on the step surface of the cylinder pressing part, and the bottom of the U-shaped bending part is downwards contacted on a bearing platform of the lower cylinder; the top of the outer filter screen is positioned in the U-shaped bending part. The U-shaped bending part radially limits the outer filter screen, and the rotational freedom degree of the outer filter screen is reserved.

Preferably, a sealing element is arranged between the U-shaped bent part of the inner filter screen and the step surface of the cylinder pressing part; the two-layer filter screen has the functions of blocking fluid from flowing out of a non-sieve-hole channel, and further, the inner filter screen is installed by utilizing the characteristic that the inner filter screen has deformation, and the inner filter screen cannot rotate through the friction force between the inner filter screen and the sealing piece.

Preferably, the cylinder body is also internally provided with a positioning piece arranged on the bearing platform, and the positioning piece comprises an annular disc, the upper part and the lower part of the annular disc are respectively connected with a small-diameter cylinder and a large-diameter cylinder, and the diameter of the small-diameter cylinder is smaller than that of the large-diameter cylinder; the bottom end of the inner filter screen and the bent part of the outer filter screen are in contact with the annular disc, the small-diameter cylinder is in contact with the inner surface of the inner filter screen, and the large-diameter cylinder is in contact with the inner surface of the outer filter screen; the upper space and the lower space of the circular ring disk are communicated. The inner filter screen, the outer filter screen and the positioning piece form a stable structure whole, and the shock resistance stability of the two layers of filter screens is improved.

Preferably, the annular disc is further provided with a positioning groove, and correspondingly, the bottom of the inner filter screen is provided with a positioning protrusion, and the positioning protrusion is matched with the positioning groove. The positioning piece and the inner filter screen are limited redundantly.

Preferably, the small-diameter cylinder and the large-diameter cylinder are comb-shaped, that is, the small-diameter cylinder and the large-diameter cylinder are provided with spaced flow passing intervals, so that fluid at the positioning part can flow out of the filter screens through the flow passing intervals and the two layers of filter screens, and a larger flow passing area is maintained.

Preferably, the permanent magnet has a curie temperature of 103 ℃; the Curie temperature is low and is easy to reach by heating, and the Curie temperature is slightly higher than the boiling point of fluid water, so that the phenomenon that the volatilization of the fluid is aggravated to increase the pressure in the magnetic filter is avoided.

Preferably, a heat insulating layer is arranged between the permanent magnet and the protective sleeve. The heat energy used for cutting off the inner cavity of the permanent magnet is conducted outwards, the temperature of the inner cavity is accelerated, and the thermal deformation amplitude of the protective sleeve is reduced.

Preferably, the protective sleeve is stainless steel. The function is as follows: not only is difficult to rust and corrode in the fluid, but also because of its high strength, when the cavity gas is heated up to the Curie point from the normal temperature, the gas pressure will increase, and the enough strength can be guaranteed to stainless steel material's protective sheath.

Preferably, the inner ring surface of the circular ring disc is provided with a radial convex part, the radial convex part extends to contact with the side wall of the protective sleeve to limit the two ends of the protective sleeve, and fluid directly acts on the protective sleeve after being flushed into the inner cavity of the cylinder body from the inner pipe; the two ends of the protective sleeve are limited, so that the stability of the protective sleeve against fluid impact is ensured, and the positioning piece and the sealing piece carry out redundancy limitation on the rotation of the two ends of the inner filter screen.

Preferably, a temperature control probe is further arranged in an inner cavity formed by the permanent magnet and used for sensing the temperature of the inner cavity of the permanent magnet and feeding the temperature back to the control head to control the heating power of the heating rod.

Preferably, a magnetic field intensity sensor is further arranged in the barrel and used for sensing the magnetic field intensity change of the permanent magnet, and a magnetic induction probe of the magnetic field intensity sensor is close to a magnetic pole of a certain permanent magnet. The magnetic induction probe is used for acquiring the position with the maximum magnetic field change rate, and sending a cleaning signal outwards when the magnetic induction probe senses that the magnetic field strength is low to a set value; the magnetic field intensity sensor is also used for matching with the temperature control probe, and when the sensed magnetic field intensity is lower than a set value, the power supply of the heating rod is controlled to be cut off.

Preferably, the magnetic induction probe is provided on a side wall of the barrel portion, and is close to the step portion at the lower end. The purpose is to approach the permanent magnet with the largest thickness of magnetic impurities, and the detection position effect is better.

Preferably, the top of the upper cylinder is also connected with an exhaust device. The sieve holes also have the function of breaking the surface stress of the bubble film to break the bubbles, releasing the gas in the bubbles, accumulating the gas at the top of the cylinder body and discharging the gas through the arranged exhaust device.

Preferably, the rotary mark cap is provided with a scale similar to a clock for representing the cleaning time, the cylinder is provided with an indication arrow, when the indication arrow indicates any scale, the positions of the sieve pores between the two layers of filter screens are overlapped, namely, the fluid passage is maintained, and when the indication arrow indicates any scale between two scale values, the positions of the sieve pores between the two layers of filter screens are staggered, the fluid passage is blocked, and the cleaning can be carried out.

An operation method for removing magnetic impurities by a magnetic filter is provided: before the heating rod is electrified to generate heat, the two layers of filter screens are staggered in advance by rotating the marking cap to block a passage of fluid flowing through the screen holes, the magnetic filter is isolated, and the fluid in the magnetic filter is discharged from the blow-down valve after the isolation. Based on the existence of heat insulation layer, the inner chamber heat is difficult for to the fluid conduction, need not discharge the fluid in the barrel, generates heat after the heating rod circular telegram and can make the temperature rise to more than the curie point in the cavity in the shorter time, and the permanent magnet embodies paramagnetism, and the magnetic impurities who adsorbs on the protective sheath surface falls blowoff valve department, and later opens water intake pipe's valve and blowoff valve, and the fluid is irritated into to the magnetism filter in the water intake pipe, and the fluid wraps up magnetic impurities from blowoff valve department and carries and rush out. The waste of fluid does not exist, the time for reaching the Curie point is shorter, the cylinder body is in a closed state in the whole cleaning process, external gas cannot enter, and the step of pressurized water exhaust is not needed any more.

Has the advantages that: compared with the prior art, the invention is provided with two layers of filter screens, the dislocation of the two layers of filter screens is controlled by the external rotary marking cap, the controllable magnetic bar component is isolated from the heating and ventilation system, the cleaning of impurities is realized by heating without disassembling the magnetic filter by utilizing the magnetic transformation characteristic of the permanent magnet at the Curie point, and the magnetic impurities and the non-magnetic impurities are removed at one time.

Drawings

FIG. 1: the invention relates to a magnetic filter and a structural sectional view with a tee joint in multi-way;

FIG. 2: the enlarged schematic diagram of the structure at A in FIG. 1

FIG. 3: the structure at B in FIG. 1 is enlarged schematically;

FIG. 4: the structure at C in FIG. 1 is enlarged and schematically shown;

FIG. 5: a structural plan view of the positioning piece;

FIG. 6: scale display schematic diagram of the rotary marking cap;

in the figure: the device comprises a cylinder body 1, an upper cylinder body 101, a lower cylinder body 102, a connecting pipe 103, an inner pipe 104, a bearing platform 105, a cylinder pressing part 106, a connecting cap 2, a multi-way 3, a flow guide wall 301, a water inlet end 302, a side outlet end 303, a return channel 304, a filter screen 4, a U-shaped bent part 401, a sieve mesh 402, an outer filter screen 5, a bent part 501, a convex tooth 502, a driving tooth 6, a rotating shaft 7, a rotating marking cap 8, a positioning piece 9, a circular disc 901, a small-diameter cylinder 902, a large-diameter cylinder 903, a positioning groove 904, an overflowing interval 905, a radial convex part 906, a sealing piece 10, a drain valve 11, a controllable magnetic rod assembly 12, a control head 13, a protective sleeve 14, a permanent magnet 15, a spacer ring 16, a heating rod 17, a heat insulating layer 18, a magnetic induction probe 19 and an exhaust device 20.

Detailed Description

A specific embodiment of the present invention will be described in detail with reference to the accompanying drawings.

Referring to fig. 1, a magnetic filter for filtering magnetic and non-magnetic impurities in a fluid, comprising a cylinder 1 as a main structure, wherein the cylinder 1 comprises an upper cylinder 101 and a lower cylinder 102 which are connected by screw threads, one side of the top of the upper cylinder 101 is provided with a connecting pipe 103, the connecting pipe 103 is connected to a connecting end of a multi-way 3 pipe fitting by a connecting cap 2 through screw threads, a flow guide wall 301 is formed on the inner wall of the multi-way 3, and the flow guide wall 301 connects two adjacent connecting ends of the multi-way to serve as a water inlet end and a side outlet end respectively; the connecting pipe 103 is connected to the side outlet end, an inner pipe 104 communicated with the inner cavity of the cylinder is coaxially arranged in the connecting pipe 103, the pipe diameter of the inner pipe 104 is equal to the inner diameter of the flow guide wall 301, when the connecting pipe 103 is connected to the side outlet end 303, the end part of the inner pipe 104 extends into the flow guide wall 301 and is matched with the flow guide wall to form a fluid passage from the water inlet end 302 to the inner cavity of the cylinder 1, and fluid is guided into the cylinder to be subjected to impurity and fruit filtration; a return channel 304 is formed between the guide wall 301 and the inner wall of the side outlet end of the multi-channel 3, and filtered fluid flows out of the magnetic filter and the multi-channel through the return channel 304 and finally flows back to the wall-mounted furnace.

Referring to fig. 1-3, a stepped bearing platform 105 is disposed at the bottom of the lower cylinder 102, an inner filter screen 4 and an outer filter screen 5 are disposed inside the cylinder, and screen holes 402 are densely distributed on the inner filter screen 4 and the outer filter screen 5 for intercepting impurities, fluid impacts on the inner filter screen, the fluid flows out of the two layers of filter screens through the screen holes, and the entrained impurities are intercepted in the filter screens. The upper cylinder 101 is provided with a pressing cylinder 106 integrally extending to the inner cavity, the end of the pressing cylinder 106 is also provided with a step structure, and the inner filter screen 4 and the outer filter screen 5 are pressed between the bearing platform 105 and the pressing cylinder 106.

Specifically, the top of the inner filter screen 4 is upwards contacted on the step surface of the pressing barrel part 106, the bottom of the inner filter screen is downwards contacted on the bearing platform 105 of the lower barrel part 102, and the top of the inner filter screen 4 is provided with a U-shaped bending part 401, the U-shaped bending part is used for increasing the contact area with the step surface of the pressing barrel part 106 after the upper barrel part 101 is connected with the lower barrel part 102, meanwhile, the U-shaped bending part also provides an installation space of the outer filter screen 5, the top of the outer filter screen 5 is positioned in the U-shaped bending part, the U-shaped bending part radially limits the outer filter screen, meanwhile, the rotation freedom degree of the outer filter screen is reserved, the outer filter screen 5 can be driven to rotate relative to the inner filter screen 4, the sieve pores of the two layers of filter screens are staggered, the fluid channels inside and outside the two layers of filter screens are blocked, the effect of isolating the inside and outside of the inner filter screen is achieved, and the air is isolated when impurities are removed, and the air enters the heating and ventilation system.

In this embodiment, a bent portion 501 is arranged at the lower portion of the outer filter screen 5, a convex tooth 502 is circumferentially arranged on the bent portion 501, a driving tooth 6 is engaged with the convex tooth 502, the driving tooth 6 is connected with a rotating shaft 7 in a non-rotating manner, and the rotating shaft 7 is connected with a rotating marking cap 8 in a non-rotating manner after penetrating through the lower cylinder 102; the rotary marking cap 8 is rotated, so that the outer filter screen 5 can be driven to rotate relative to the inner filter screen 4 through the meshing action of the gears. The sealing performance of the magnetic filter is guaranteed through the sealing ring at the position, penetrating through the lower barrel, of the rotating shaft, meanwhile, the clamping spring is further arranged on the rotating shaft to limit axial movement of the rotating shaft, and the convex teeth are guaranteed not to be dislocated with the driving teeth in a meshed mode.

Referring to fig. 1 and 5, a positioning member 9 is further arranged in the cylinder 1, the positioning member 9 includes a circular ring plate 901, the circular ring plate 901 is vertically connected with a small diameter cylinder 902 and a large diameter cylinder 903 respectively, the diameter of the small diameter cylinder 902 is smaller than that of the large diameter cylinder 903, the bottom end of the inner filter screen 4 contacts the circular ring plate 901, the bending part 501 of the outer filter screen 5 also contacts the circular ring plate 901, the upper space and the lower space of the outer filter screen are communicated by the circular ring plate 901, so that impurities in the filter screen can be deposited to a lower blowoff valve; the small diameter cylinder 902 is in contact with the inner surface of the inner filter 4, and the large diameter cylinder 903 is in contact with the inner surface of the outer filter.

The inner filter screen 4 is axially limited by the annular disc 901 and the cylinder pressing part 106, the upper end of the inner filter screen is radially limited by the outer filter screen 5, and the lower end of the inner filter screen is radially limited by the outer filter screen and the small-diameter cylinder 902; the outer filter screen 5 is axially limited by a U-shaped bending part 401 of the inner filter screen and the annular disc 901, the upper end of the outer filter screen is radially limited by the U-shaped bending part 401, and the lower end of the outer filter screen is radially limited by the large-diameter cylinder 903 and the bearing platform 105; the positioning element 9 is axially limited by the bending part 501 of the outer filter screen 5 and the bearing platform 105, and is radially limited by the inner walls of the inner filter screen and the outer filter screen. Interior filter screen, outer filter screen and setting element have constituted a stable structure wholly, have improved the shock resistance stability ability of two-layer filter screen, and further, still be provided with constant head tank 904 on the ring dish 901, with it correspondingly, interior filter screen 4 bottom is provided with the protruding 503 in location, the protruding 503 in location cooperates with constant head tank 904, and it is spacing to be used for making setting element and interior filter screen have redundantly.

The inner filter screen 4 is non-rotatable, a sealing element 10 is arranged between the U-shaped bending part 401 of the inner filter screen 4 and the step surface of the pressing barrel part 106, the sealing element can adopt a cup sealing element, the sealing element is used for blocking fluid from flowing out of two layers of filter screens from a non-sieve-hole channel, the inner filter screen is installed by utilizing the characteristic that the inner filter screen has deformation, the friction force between the inner filter screen and the sealing element is enough to ensure that the inner filter screen loses the rotational freedom degree, the outer filter screen rotates under the driving of the rotation marking cap 8, and the two layers of filter screens can rotate relatively.

The small-diameter cylinder 902 and the large-diameter cylinder 903 are comb-shaped, that is, the small-diameter cylinder 902 and the large-diameter cylinder 903 are provided with flow passing intervals 905 at intervals, so that fluid at the positioning part 9 can flow out of the filter screens through the flow passing intervals 905 and two layers of filter screens, and a large flow passing area is maintained.

A blow-down valve 11 is connected below the side end of the cylinder body 1, the blow-down valve 11 is communicated with the inner space of the inner filter screen 4, impurities intercepted by the filter screen enter and are accumulated at the blow-down valve 11 under the flushing of fluid, and the blow-down valve can be opened periodically for blow-down treatment. The volume of the impurity that the filter screen can be held back is relevant with the aperture of sieve mesh, and in reality, there is magnetic impurity such as a small amount of iron fillings in the impurity, and its characterized in that is small, can't filter through the aperture that reduces the sieve mesh. The embodiment realizes the adsorption and removal of magnetic impurities through the controllable magnetic rod assembly 12, and the specific scheme is as follows:

referring to fig. 1 and 4, the controllable magnetic rod assembly 12 includes a control head 13, the control head 13 is fixedly connected to the upper cylinder 101, a control component is arranged inside the control head 13, a protective sleeve 14 is connected to the outside, a plurality of permanent magnets 15 are arranged inside the protective sleeve 14, the permanent magnets 15 are isolated by a spacer ring 16, any permanent magnet 15 has two poles, namely an N pole and an S pole, according to the general knowledge, the magnetic strength at the magnetic poles is the maximum, a magnetic field with uniform magnetic strength is formed in the filter screen through the plurality of arranged permanent magnets 15, the adsorption capacity of magnetic field impurities in the fluid is increased, and the magnetic impurities wrapped in the fluid are magnetized and then adsorbed on the protective sleeve 14; as explained in the background art, the existence of the magnetic field of the permanent magnet 15, the fluid cannot wash away the magnetic impurities attached to the fluid, and this embodiment eliminates or reduces the magnetic field strength to a low value state when the magnetic impurities need to be cleaned by means of temperature rise, so that the fluid washes and wraps the impurities to the blowoff valve, specifically: the permanent magnet 15 is a temperature sensing magnet having a curie temperature of 103 ℃. The curie temperature or magnetic transition point refers to a temperature at which a material can change between a ferromagnetic body and a paramagnetic body, that is, a transition temperature at which the ferromagnetic body changes from a ferromagnetic phase to a paramagnetic phase, or a transition temperature at which a two-stage phase transition occurs, and below the curie point temperature, the material becomes a ferromagnetic body, and when the temperature is higher than the curie point temperature, the material becomes a paramagnetic body, which exhibits paramagnetism with a weak response to a magnetic field.

In this embodiment, the curie temperature of permanent magnet 15 is 103 ℃, and the curie temperature is low, easily reaches through the heating, and the curie temperature is a little higher than the boiling point of fluid water, avoids aggravating fluidic volatilizing and increases the pressure in the magnetic filter, and after the stability of environment of locating reached 103 ℃, permanent magnet 15 embodied paramagnetism, neglected the adsorption affinity of magnetic impurity.

Referring to fig. 1 and 3, the permanent magnet 15 is a magnetic ring, an inner ring of the magnetic ring is formed with a cavity in the protective sleeve, a heating rod 17 is arranged in the cavity, the heating rod 17 is electrically connected with the control head 13 at the top of the upper cylinder 101, the heating rod 17 heats after being electrified, the temperature of the cavity is heated to be above the curie point of the permanent magnet, the permanent magnet is paramagnetic, and magnetic impurities adsorbed on the surface of the protective sleeve 14 lose magnetic force and then are separated from the surface of the protective sleeve under the self-weight and the washing of fluid.

In this embodiment, before heating rod 17 circular telegram generates heat, make outer filter screen rotate through rotating mark cap 8 in advance, two-layer filter screen dislocation will block the passageway of fluid flow through the sieve mesh to keep apart the magnetic filter, close the valve on inlet channel and the outlet conduit and can keep apart the magnetic filter, emit the fluid in the magnetic filter from the blowoff valve after keeping apart, the purpose is in avoiding heating the fluid. Based on that the permanent magnet and the protective sleeve are good heat conductors, the fluid is medium water, the specific heat capacity is large, the heating rod 17 is difficult to quickly raise the temperature of the inner cavity of the protective sleeve above a Curie point after heating, moreover, because the Curie point is higher than the boiling point of water, the fluid is partially vaporized to cause the internal pressure of the cylinder to increase in the heating process, the cylinder has the risk of bursting, after the fluid in the cylinder is isolated and exhausted, the cylinder is internally provided with air, according to the normal reason, the air has the heat insulation effect, the heating rod can enable the temperature in the cavity to rise above the Curie point in a short time, meanwhile, because the blowoff valve is in an open state, the air in the cylinder is communicated with the outside and the air pressure is constant, the permanent magnet 15 embodies paramagnetism, magnetic impurities adsorbed on the surface of the protective sleeve 14 fall to the blowoff valve, then, the valve of the water inlet pipeline is opened, the fluid is filled into the magnetic filter, the impurities are flushed out from the blowoff valve, and meanwhile, the fluid is contacted with the protective sleeve, so that the protective sleeve and the inner cavity is cooled.

The internal gas of fluid can increase inside pipeline internal pressure, can aggravate the oxidation and the corruption of part and pipeline, and gaseous exhaust apparatus through the top in the working process outwards discharges, nevertheless in this embodiment, need open the blowoff valve when driving magnetic impurity to outside exhaust impurity and maintain the barrel internal pressure invariable, outside air must get into in the barrel filter screen. Based on the prerequisite that both sides filter screen will inside and outside fluid passage block, before communicating the magnetic filter to the pipeline again, need to discharge the gas in the magnetic filter through the pressurized water, specifically: the exhaust device can be set as an exhaust blocking cap, the marking cap 8 is rotated again to enable the two layers of filter screens to recover the passage of fluid flowing through the screen holes, the water inlet pipe valve is opened, the water outlet pipe valve is kept closed, the blowoff valve is closed, the fluid entering the filter screens extrudes the gas in the filter screens out of the screen holes, and the gas is discharged together through the opened exhaust blocking cap until the cylinder body is filled with the fluid.

In another embodiment, on the basis of the above embodiments, a heat insulating layer 18 is disposed between the permanent magnet 15 and the protective sleeve 14, and is used for blocking heat energy in the inner cavity of the permanent magnet from being conducted outwards, so as to accelerate the temperature rise of the inner cavity and reduce the thermal deformation amplitude of the protective sleeve. The heat insulation layer accessible heat insulating tape successive layer twines on the permanent magnet, and crisscross winding in upper and lower both sides is impressed whole from the protective sheath open end after the winding is accomplished, the effect of heat insulation layer still lies in providing the required space of permanent magnet thermal expansion, avoids the protective sheath by the spalling.

In this embodiment, before the heating rod 17 is energized to generate heat, the two layers of filter screens are also staggered in advance by rotating the marking cap 8 to block the passage of the fluid through the screen holes, the magnetic filter is isolated, and the fluid in the magnetic filter is discharged from the blow-down valve after the isolation. The difference lies in that: based on the existence of heat insulation layer, the inner chamber heat is difficult for to the fluid conduction, the time that the inner chamber heaies up to the curie point is short, avoid the fluidic to heat simultaneously, so no longer need discharge the fluid in the barrel, it can make the temperature rise to more than the curie point in the cavity in the shorter time to generate heat after the heating rod circular telegram, permanent magnet 15 embodies paramagnetism, the magnetic impurities who adsorbs on protective sheath 14 surface falls blowoff valve department, and later open the valve and the blowoff valve of inlet channel, the fluid is irritated into to the magnetic filter in the inlet channel, the fluid wraps up from the blowoff valve department with magnetic impurities and carries the rush-out. In the embodiment, the waste of fluid does not exist, the time for reaching the Curie point is shorter, more importantly, in the whole cleaning process, the cylinder is in a closed state, external gas cannot enter, and the step of pressurized water exhaust is not needed any more.

According to the invention, through the arrangement of the heating rod, the permanent magnet does not need to be repeatedly taken out for cleaning as in the prior art, the whole sealing performance of the magnetic filter is ensured, and the controllable magnetic rod assembly 12 is isolated from the system by staggering the filter screens at two sides during cleaning, so that the condition that magnetic impurities pass through two layers for filtering and enter the system during cleaning is avoided, and the adverse effect caused by gas entering the system is also avoided.

It should be noted that, in the prior art, the protective sleeve 14 is a copper sleeve, the copper material has a non-magnetized characteristic, the magnetic field can cover the inner filter screen, and more importantly, in the heating and ventilating fluid, copper ions have a certain sterilization effect, so that bacteria cannot generate antibodies and cannot breed bacteria, so that the prior art adopts copper or copper alloy. In this embodiment, the protective sleeve 14 is made of stainless steel, different from the existing copper alloy, and according to common knowledge, compared with copper, the stainless steel has lower cost and higher strength, when the protective sleeve is made of stainless steel, the protective sleeve is not easy to rust and corrode in fluid, and because the strength of the stainless steel is high, when the temperature of the cavity gas is increased from normal temperature to the curie point of 103 ℃, the gas pressure is increased to about 1.2 times, and the protective sleeve made of stainless steel can ensure sufficient strength.

The top opening of the protective sleeve 14 is used for placing components such as a permanent magnet, and the top opening is fixedly connected with the control head during installation, further, a radial protrusion 906 is arranged on the inner annular surface of the annular disc 901, and the radial protrusion 906 extends to contact with the side wall of the protective sleeve 14 to limit the two ends of the protective sleeve 14. After the fluid rushes into the inner cavity of the cylinder body from the inner tube 104, the fluid directly acts on the protective sleeve 14, and the two ends of the protective sleeve 14 are limited, so that the stability of the protective sleeve against fluid impact is ensured; moreover, because the protective sleeve 14 is directly or indirectly fixedly connected to the cylinder, the contact friction between the radial protrusion 906 and the protective sleeve 14 limits the positioning element 9 from rotating, so that the inner filter screen 4 positioned thereon cannot rotate, that is, the positioning element 9 and the sealing element 10 limit the rotation of the two ends of the inner filter screen 4 redundantly.

The inner chamber that permanent magnet 15 formed still embeds there is temperature control probe (not shown), is used for the temperature of perception permanent magnet inner chamber, and then feeds back to the control head in order to control the heating power of heating rod 17, for example, in the earlier stage that the heating rod generates heat, give the great power of heating rod, after being close or reaching curie point and stabilizing, the control head reduces heating rod power and maintains and wash the end, or, directly breaks off the heating rod power, need a period of time based on permanent magnet 15 resumes to ferromagnetic body, and wash consuming time weak point, all can guarantee the cleaning performance.

Referring to fig. 1, a magnetic field intensity sensor is further arranged in the cylinder and used for sensing the magnetic field intensity change of the permanent magnet 15, the magnetic field intensity sensor adopts a split type design, and a magnetic induction probe 19 of the magnetic field intensity sensor is close to a magnetic pole of a certain permanent magnet 15, namely, is arranged at a certain position with larger magnetic field intensity. After the magnetic filter works for a period of time, based on the adsorption effect of the permanent magnet, a layer of magnetic impurities is attached to the surface of the protective sleeve 14, the magnetic impurity layer with a certain thickness changes the distribution of a magnetic field, and when the magnetic induction probe 19 senses that the intensity of the magnetic field is lower than a set value, a cleaning signal is sent outwards; the magnetic field intensity sensor is also used for matching with the temperature control probe, and when the sensed magnetic field intensity is lower than a set value, the power supply of the heating rod is controlled to be cut off.

Further, magnetic induction probe 19 is located on the lateral wall of pressing section of thick bamboo portion 106, and is close to the step portion of lower extreme, aim at is close to the biggest permanent magnet of magnetic impurity thickness, controllable bar magnet subassembly 12 upper portion is close to inner tube 104, the fluid scouring action that gets into the barrel makes controllable bar magnet subassembly upper portion adsorb magnetic impurity thickness and is less than the middle part position, and controllable bar magnet subassembly lower part and fluid action are latest, magnetic impurity adsorbs in the first half section in advance, can control the magnetic impurity layer thickness nonconformity of the magnetic impurity layer that adsorbs on the bar magnet subassembly, the step portion department thickness of pressing the section of thick bamboo portion is thicker, the detection position effect as magnetic induction probe is better.

The top of the upper cylinder 101 is also connected with an exhaust device 20 for releasing gas generated inside the system outwards, and the sieve mesh also has the function of breaking the surface stress of the bubble film to break the bubble, so that the gas in the bubble is released, and the gas is accumulated on the top of the cylinder and is exhausted through the arranged exhaust device.

The magnetic filter shown in fig. 1 of the present invention is of a vertical type, but the present embodiment is only an example thereof, and is not limited to the installation manner of the magnetic filter, and is applicable to, for example, a horizontal type, and the exhaust device and the blowoff valve are different only in position.

The invention is provided with two layers of filter screens, controls the dislocation of the two layers of filter screens by an external rotary marking cap, isolates a controllable magnetic bar component from a heating and ventilation system, and realizes the cleaning of impurities under the condition of not disassembling the magnetic filter by heating by utilizing the magnetic transformation characteristic of a permanent magnet at the Curie point, and removes magnetic impurities and non-magnetic impurities at one time.

According to the fact, the invention can also independently start the blow-down valve to clean nonmagnetic impurities, and mark the cleaning time by rotating the marking cap; this embodiment gives an example:

referring to fig. 5, scales 1-12 similar to a clock are arranged on the rotary marking cap to represent different months, meanwhile, an indicating arrow is arranged on the barrel, the scale pointed by the indicating arrow indicates the last cleaning time, according to the fact that the cleaning frequency is less than once a month, and the rotary marking cap is rotated to a scale value representing the month of the month no matter which day of the month is cleaned; when the indication arrow indicates the scale between any two scale values, the sieve pore positions between the two filter screens are staggered to block the fluid passage.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A magnetic filter, comprising:

the inner part of the cylinder body (1) is a cavity, the top of the cylinder body is provided with a connecting pipe (103), and an inner pipe (104) communicated with the cavity is arranged in the connecting pipe;

the inner wall of the multi-way (3) presents a flow guide wall (301) which guides the fluid into the cylinder body and guides the fluid out after filtration;

a blowoff valve (11) connected to the lower part of the cylinder and communicated with the cavity;

it is characterized by also comprising:

the inner filter screen (4) is fixed in the cavity and can not rotate;

the outer filter screen (5) is coaxially sleeved outside the inner filter screen, the lower part of the outer filter screen is provided with a bending part (501), and the upper circumference of the bending part is provided with convex teeth (502);

a drive tooth (6) engaged with the convex tooth (502);

one end of the rotating shaft (7) is connected with the driving gear (6) in a non-rotating way, and the other end of the rotating shaft penetrates through the cylinder body to the outside of the cylinder body;

the rotary marking cap (8) is connected to one end of the rotary shaft (7) outside the cylinder body in a non-rotary manner;

and the controllable magnetic rod assembly (12) controls the intensity of the magnetic field in the cavity through heating.

2. A magnetic filter according to claim 1, characterized in that the controllable magnetic bar assembly (12) comprises:

the control head (13) is fixed on the cylinder body, is internally provided with a control component and is used for controlling the heating state of the heating rod;

the permanent magnets (15) are annular and are isolated by a spacer ring (16);

a protective sheath (14) fluidly isolating the interior of the protective sheath from the exterior;

and the heating rod (17) generates heat after being electrified, and heats the temperature of the inner cavity of the permanent magnet to be above the Curie point.

3. The magnetic filter of claim 1, wherein:

a step-shaped bearing platform (105) is arranged at the bottom of the barrel body (1), a barrel pressing part (106) extending to the cavity is arranged at the top of the barrel body, and a step structure is arranged at the end part of the barrel pressing part (106);

the top of the inner filter screen (4) is provided with a U-shaped bending part (401), the U-shaped bending part is contacted on the step surface of the cylinder pressing part (106), and the bottom of the U-shaped bending part is downwards contacted on a bearing platform (105) of the lower cylinder body (102); the top of the outer filter screen (5) is positioned in the U-shaped bending part.

4. A magnetic filter as claimed in claim 3, in which:

a sealing element (10) is arranged between the U-shaped bending part (401) of the inner filter screen (4) and the step surface of the cylinder pressing part (106).

5. The magnetic filter of claim 4, wherein:

the barrel body (1) is also internally provided with a positioning piece (9) arranged on the bearing platform (105), the positioning piece comprises an annular disc (901), the upper part and the lower part of the annular disc (901) are respectively connected with a small-diameter cylinder (902) and a large-diameter cylinder (903), and the diameter of the small-diameter cylinder (902) is smaller than that of the large-diameter cylinder (903); the bottom end of the inner filter screen (4) and the bending part (501) of the outer filter screen (5) are in contact with the annular disc (901), the small-diameter cylinder (902) is in contact with the inner surface of the inner filter screen (4), the large-diameter cylinder (903) is in contact with the inner surface of the outer filter screen, and the upper space and the lower space of the annular disc (901) are communicated;

a positioning groove (904) is further formed in the circular ring disc (901), a positioning protrusion (503) is arranged at the bottom of the inner filter screen (4), and the positioning protrusion (503) is matched with the positioning groove (904);

the small-diameter cylinder (902) and the large-diameter cylinder (903) are comb-shaped, and the small-diameter cylinder (902) and the large-diameter cylinder (903) are provided with flow passing intervals (905) at intervals;

the inner ring surface of the ring disc (901) is provided with a radial convex part (906), and the radial convex part (906) extends to contact with the side wall of the protective sleeve (14).

6. The magnetic filter of claim 2, wherein: and a heat insulating layer (18) is arranged between the permanent magnet (15) and the protective sleeve (14).

7. The magnetic filter of claim 2, wherein: the protective sleeve (14) is made of stainless steel.

8. The magnetic filter of claim 2, wherein: and a temperature control probe is also arranged in an inner cavity formed by the permanent magnet (15) and used for sensing the temperature of the inner cavity of the permanent magnet and feeding back the temperature to the control head to control the heating power of the heating rod (17).

9. The magnetic filter of claim 8, wherein:

a magnetic field intensity sensor is also arranged in the cylinder body and used for sensing the magnetic field intensity change of the permanent magnet (15);

a magnetic induction probe (19) of the magnetic field intensity sensor is provided on the side wall of the pressure cylinder part (106) at a position close to the lower end step part and close to the magnetic pole of a certain permanent magnet (15).

10. The magnetic filter of claim 1, wherein: the rotary marking cap is provided with a scale similar to a clock for representing the cleaning time.