CN210583911U - Front filter - Google Patents

Abstract

The utility model discloses a front filter, including the casing, locate the filter assembly in the casing and be used for supplying the flush fluid to flow into filter assembly in order to wash dirty water inlet, and locate the casing both ends and the first blowoff valve and the second blowoff valve that are linked together with filter assembly respectively. The utility model provides a leading filter can open first blowoff valve or second blowoff valve alternatively, makes dirty discharge from first blowoff valve or second blowoff valve. In view of first blowoff valve and second blowoff valve locate the both ends of casing to realize two-way blowdown, reduce because of the risk that single blowoff valve damaged and can't realize the blowdown, the fault rate is lower, and the blowdown is more smooth, consequently the utility model provides a leading filter's blowdown reliability is higher.

Description

Front filter

Technical Field

The utility model relates to a filtration equipment, in particular to leading filter.

Background

The existing tap water causes secondary pollution due to pipeline rusting, leakage and the like, seriously harms the body health and the service life of subsequent equipment, and on the basis of the secondary pollution, a pre-filter is usually additionally arranged on a household pipeline of the tap water so as to remove impurities such as iron rust, sand mud, algae and the like in the tap water pipeline by using the pre-filter.

The existing pre-filter comprises a shell, a filter screen and a blow-down valve, and the blow-down valve is usually arranged at the bottom end. When the filter is normally filtered, the drain valve is closed, raw water flows into the inner side from the outer side of the filter screen to realize raw water filtration, and impurities generated in the filtration process are mostly adhered to the filter screen; when washing the filter screen, the blowoff valve is opened, and the flush fluid flows into the outside in order to wash adhered impurity by the inboard of filter screen, and the flush fluid that contains impurity is discharged from the blowoff valve.

However, because the blowoff valve is usually only arranged at one end of the shell, the single blowoff valve is easy to be opened due to corrosion and other factors, and the reliability of the blowoff is poor.

Therefore, how to improve the reliability of the pollution discharge of the existing prefilter is a technical problem to be solved urgently by those skilled in the art.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model aims at providing a leading filter can realize two-way blowdown, and the blowdown is more smooth, and the blowdown reliability is higher.

The specific scheme is as follows:

the utility model provides a leading filter, include:

a housing;

a filter assembly disposed within the housing;

a water inlet for flowing a rinsing liquid into the filter assembly to rinse the contaminants;

and the first blow-down valve and the second blow-down valve are arranged at two ends of the shell, are respectively communicated with the filtering component and are used for selectively discharging washed dirt.

Preferably, the first blowoff valve is an electric ball valve, and the first blowoff valve further comprises a controller connected with the electric ball valve and used for controlling the opening and closing of the electric ball valve.

Preferably, the method further comprises the following steps:

a water outlet for discharging purified water;

the water inlet pressure detection piece is arranged at the water inlet and is used for detecting the water inlet pressure;

the water outlet pressure detection piece is arranged at the water outlet and is used for detecting the water pressure;

the water inlet pressure detection piece and the water outlet pressure detection piece are both connected with the controller, and the controller controls the electric ball valve to be opened when the difference between the water inlet pressure and the water outlet pressure reaches a preset difference value according to signals sent by the water inlet pressure detection piece and the water outlet pressure detection piece.

Preferably, the method further comprises the following steps:

the controller is provided with a timer for recording the use time of the filter assembly; the controller is used for controlling the electric ball valve to be opened when the service time of the filtering component reaches the preset service time according to the signal sent by the timer.

Preferably, the method further comprises the following steps:

and the handheld terminal is connected with the controller and is provided with a cleaning button, and the controller controls the electric ball valve to be opened when receiving a signal sent by the cleaning button.

Preferably, the method further comprises the following steps:

the dirty content detection part is connected with the controller, arranged at the outlet of the electric ball valve and used for detecting the dirty content at the outlet of the electric ball valve; the controller is used for controlling the electric ball valve to be closed when the signal is sent by the dirt content detection part and the dirt content at the outlet of the electric ball valve is lower than the preset dirt content.

Preferably, the second blowoff valve is a manual ball valve, and further comprises a blowoff switch arranged on the second blowoff valve and used for manually controlling the second blowoff valve to open and close.

Preferably, the sewage treatment device further comprises a sewage discharge pipe which penetrates through the filtering assembly and is communicated with the first sewage discharge valve and the second sewage discharge valve at two ends respectively for circulating the sewage.

Preferably, the housing includes a housing body and a housing end cap connected to the housing body, and the filter assembly includes:

a filter screen;

the supporting framework is sleeved between the filter screen and the shell body;

detachably is fixed in the filter screen and is close to the filtration baffle of second blowoff valve one end, and the flush fluid that flows in between filter screen and the support chassis promotes the removal of filter baffle so that the filter screen is far away from the central die cavity of shell end cover in order to switch on water inlet and filter screen.

Preferably, the filter assembly further comprises:

the elastic component that washes that overlaps in the filter screen periphery and be used for assisting the filter screen to reset, the inside wall of support chassis 22 is equipped with the butt step face that offsets with the first end that washes the elastic component, and the one end that filtering baffle was kept away from to the filter screen is equipped with the butt flange that offsets with the second end that washes the elastic component.

Compared with the prior art, the utility model provides a leading filter includes first blowoff valve and second blowoff valve, includes that dirty flush fluid can flow to the both ends of casing. Alternatively, the first or second blow-down valve is opened to discharge the soil from the first or second blow-down valve. In view of first blowoff valve and second blowoff valve locate the both ends of casing to realize two-way blowdown, reduce because of the risk that single blowoff valve damaged and can't realize the blowdown, the fault rate is lower, and the blowdown is more smooth, consequently the utility model provides a leading filter's blowdown reliability is higher.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

FIG. 1 is a block diagram of a prefilter according to a first embodiment of the present invention;

FIG. 2 is an exploded view of FIG. 1;

FIG. 3 is a view showing an operation state of the pre-filter of FIG. 1 when filtering raw water;

FIG. 4 is a view of the pre-filter of FIG. 1 in operation during flushing of the filter assembly;

FIG. 5 is a view showing the pre-filter of FIG. 1 in operation when the first soil discharge valve is used to discharge soil;

FIG. 6 is another sectional view of the pre-filter of FIG. 1 when filtering raw water;

FIG. 7 is a block diagram of the end cap of the housing of FIG. 1;

FIG. 8 is a cross-sectional view of FIG. 7;

FIG. 9 is another cross-sectional view of FIG. 7;

FIG. 10 is a block diagram of the filter assembly of FIG. 1;

FIG. 11 is an exploded view of FIG. 10;

FIG. 12 is a block diagram of the upper pipe joint of FIG. 3;

fig. 13 is a sectional view showing a prefilter according to a second embodiment of the present invention.

The reference numbers are as follows:

the device comprises a shell body 11, a shell end cover 12, a lower housing 13, an upper housing 14, a filtering component 2, a first blow-off valve 3, a blow-off pipe 4, a second blow-off valve 5, a blow-off switch 6, a main joint 7, a pressure regulating valve 8, a flowmeter rotor 9 and a controller 10;

the system comprises a wireless communication module 101, a water inlet pressure detection piece 102 and a water outlet pressure detection piece 103;

an end cover inlet 121, an end cover outlet 122, an isolating ring plate 123, an annular cavity 124 and a cylindrical cavity 125;

the device comprises a filter screen 21, a support framework 22, a filter baffle 23, a flushing elastic part 24, a lower connecting sleeve 25, a lower pipe joint 26, an upper pipe joint 27, a limiting ring 28, a water inlet quick joint 291 and a water outlet quick joint 292;

a limit groove 271 and an annular mounting groove 272;

a water inlet detection port 2911 and a water outlet detection port 2921;

a water inlet 51 and a water outlet 52.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In order to make the technical field better understand the solution of the present invention, the following detailed description of the present invention is provided with reference to the accompanying drawings and specific embodiments.

Referring to fig. 1 to 12, fig. 1 is a structural diagram of a pre-filter according to a first embodiment of the present invention; FIG. 2 is an exploded view of FIG. 1; FIG. 3 is a view showing an operation state of the pre-filter of FIG. 1 when filtering raw water; FIG. 4 is a view of the pre-filter of FIG. 1 in operation during flushing of the filter assembly; FIG. 5 is a view showing the pre-filter of FIG. 1 in operation when the first soil discharge valve is used to discharge soil; FIG. 6 is another sectional view of the pre-filter of FIG. 1 when filtering raw water; FIG. 7 is a block diagram of the end cap of the housing of FIG. 1; FIG. 8 is a cross-sectional view of FIG. 7; FIG. 9 is another cross-sectional view of FIG. 7; FIG. 10 is a block diagram of the filter assembly of FIG. 1; FIG. 11 is an exploded view of FIG. 10; fig. 12 is a structural view of the upper pipe joint of fig. 3.

The utility model provides a leading filter, including casing, filter assembly 2, first blowoff valve 3 and second blowoff valve 5.

In a first embodiment, and with reference to the current view of fig. 1, a first waste valve 3 is provided at the top of the housing and a second waste valve 5 is provided at the bottom of the housing.

The shell comprises a shell body 11 and a shell end cover 12, wherein the shell body 11 is provided with a containing cavity for containing the filter assembly 2, the shell end cover 12 is arranged at an opening for containing the cavity, preferably, the shell body 11 is in threaded connection with the shell end cover 12, and a sealing ring can be additionally arranged between contact surfaces of the shell body 11 and the shell end cover 12 to prevent the shell from leaking.

The utility model discloses still include the water inlet 51 that is used for supplying the flush fluid to flow into filter assembly 2 to the wash fluid adheres to the dirt on filter assembly 2. The water inlet 51 is arranged on the main joint 7, and the main joint 7 is connected with the shell.

The filter assembly 2 for washing the dirt is arranged in the shell, the filter assembly 2 is communicated with the water inlet 51, and when raw water is filtered, the raw water flows into the filter assembly 2 from the water inlet 51; when the filter module 2 is flushed, flushing liquid flows into the filter module 2 through the water inlet 51. Of course, the raw water may be tap water having a certain pressure, and the rinsing liquid may be purified water having a certain pressure and containing less impurities.

Preferably, the filter assembly 2 comprises a filter screen 21, a support frame 22, a filter baffle 23 and a flushing spring 24.

The filter screen 21 is cylindric including filtering the curb plate and filtering the bottom plate, filters the curb plate and has a plurality of filtration pores, filters the bottom plate and sets firmly in the bottom of filtering the curb plate. The support frame 22 is located between the filter screen 21 and the housing body 11, and is fixed to the housing body 11. The supporting frame 22 is cylindrical, and the side surface is provided with a plurality of drainage holes penetrating along the thickness direction, and the drainage holes are used for discharging dirt. Preferably, a skeleton sealing ring is arranged between the outer side surface of the supporting skeleton 22 and the shell body 11, and the skeleton sealing ring is flush with the bottom of the filter screen 21 during filtering, so that raw water is prevented from flowing into the bottom of the supporting skeleton 22 through a drain hole, and pollution to the raw water caused by dirt at the bottom of the supporting skeleton 22 is avoided.

The filtering baffle 23 is installed at the filtering bottom plate of the filtering net 21, and specifically, the filtering baffle 23 is fixed at the bottom of the filtering bottom plate by a set screw. A stop sealing ring is arranged between the filtering baffle 23 and the inner side wall of the supporting framework 22, so that flushing liquid flowing between the filtering net 21 and the supporting framework 22 can apply acting force to the filtering baffle 23.

Be equipped with between the medial surface of support frame 22 and the outer peripheral face of filter screen 21 and wash elastic component 24, the bottom that washes elastic component 24 offsets with the butt step face that support frame 22 inboard was established, and the top that washes elastic component 24 offsets with the butt flange that the filter screen 21 top was established, and the butt flange is cylindricly, and the external diameter of butt flange is greater than the external diameter of filter screen 21. The butt flange periphery sets firmly the skeleton flange sealing washer that offsets with support skeleton 22 to the butt flange offsets with support skeleton 22, and the gap between flange sealing washer sealed butt flange and the support skeleton 22 prevents that the flush fluid from leaking.

Correspondingly, a separating ring plate 123 is arranged on one side of the shell end cover 12 close to the filter screen 21, an annular cavity 124 is formed between the outer peripheral surface of the separating ring plate 123 and the inner side surface of the shell end cover 12, a cylindrical cavity 125 is formed by surrounding the inner side surface of the separating ring plate 123, the annular cavity 124 is communicated with the water inlet 51, and the cylindrical cavity 125 is communicated with the water outlet 52. Further, the shell end cover 12 further has an end cover inlet 121 communicated with the water inlet 51 and an end cover outlet 122 communicated with the water outlet 52, the end cover inlet 121 and the end cover outlet 122 are coaxially arranged, the end cover outlet 122 is communicated with the water outlet 52, and a cavity formed by the outer peripheral surface of the end cover outlet 122 and the inner side surface of the end cover inlet 121 is communicated with the water inlet 51, so that the end cover inlet 121 and the end cover outlet 122 are independently arranged.

Referring to fig. 3, when raw water is filtered, the flushing elastic member 24 is in a natural state, the filter screen 21 abuts against the shell end cover 12, specifically, the top end of the filter screen 21 abuts against the isolating ring plate 123, raw water flowing from the water inlet 51 flows into the annular cavity 124 through the end cover inlet 121, raw water in the annular cavity 124 flows into the filter screen 21 from the outer side of the filter screen 21, filtered purified water flows into the cylindrical cavity 125, and finally flows into the water outlet 52 through the end cover outlet 122 to be discharged.

Referring to fig. 4 and 5, when the dirt is washed, the washing liquid flows to the bottom of the filter screen 21, the washing liquid applies a certain acting force to the filtering baffle plate 23, when the acting force is too large, the filtering baffle plate 23 drives the filter screen 21 to move downwards relative to the supporting framework 22 until the abutting flange abuts against the top end of the supporting framework 22, the filter screen 21 is separated from the isolation ring plate 123, the bottom of the washing liquid flowing to the filter screen 21 is blocked, the annular cavity 124 and the columnar cavity 125 are both communicated with the inner side of the filter screen 21, the washing liquid flowing into from the water inlet 51 directly flows into the inner side of the filter screen 21 after sequentially passing through the end cover inlet 121 and the annular cavity 124, the washing liquid is discharged from the outer side of the filter screen 21, the washing liquid applies a reaction force to the dirt, the dirt overcomes the adhesion force until.

Of course, the structure of the filter assembly 2 is not limited thereto, and other similar structures are adopted without affecting the achievement of the purpose of the present invention.

The first blow-off valve 3 and the second blow-off valve 5 are respectively arranged at two ends of the shell, and the first blow-off valve 3 and the second blow-off valve 5 are respectively communicated with the filtering component 2, so that the washed dirt can be discharged from the first blow-off valve 3 and the second blow-off valve 5 alternatively. It should be particularly noted that, when the raw water is filtered, the first blowoff valve 3 and the second blowoff valve 5 are both in a closed state; when the dirt is washed, the first blow-down valve 3 and the second blow-down valve 5 are alternatively opened.

Preferably, the first blowdown valve 3 is an electric ball valve, so that the first blowdown valve 3 can be conveniently and automatically controlled to be opened and closed, and the use is convenient; correspondingly, second blowoff valve 5 is manual ball valve to when the unexpected condition such as circuit fault or card died appears because of first blowoff valve 3, the user can utilize the manual blowdown of second blowoff valve 5, guarantees reliably effectively the blowdown.

Correspondingly, the utility model discloses still include the controller 10 that links to each other with electric ball valve, controller 10 can control electric ball valve and open and close. It should be noted that there are various ways for the controller 10 to control the opening and closing of the electric ball valve.

Firstly, it should be added that the present invention further includes a water outlet 52 for supplying and discharging purified water, and the water outlet 52 is disposed on the main joint 7, as described in detail below.

The blowdown command may be determined by the pressure difference between the water inlet 51 and the water outlet 52, and it is understood that the present invention further includes a water inlet pressure detecting member 102 and a water outlet pressure detecting member 103. The water inlet pressure detecting member 102 is provided at the water inlet 51 for detecting the water inlet pressure. The water outlet pressure detecting member 103 is disposed at the water outlet 52 and is used for detecting water pressure. The inlet water pressure detecting member 102 and the outlet water pressure detecting member 103 may be pressure sensors, but the type is not limited thereto.

The water inlet pressure detection piece 102 and the water outlet pressure detection piece 103 are both connected with the controller 10, the water inlet pressure detection piece 102 and the water outlet pressure detection piece 103 send signals to the controller 10, the controller 10 analyzes and compares the received signals, when the difference between the water inlet pressure and the water outlet pressure reaches a preset difference value, the controller 10 generates a pollution discharge instruction, sends the pollution discharge instruction to the electric ball valve, and controls the electric ball valve to be opened to flush dirt; otherwise, the electric ball valve keeps the closed state continuously, and the raw water filtration is conveniently realized.

It should be noted that the preset difference here refers to the maximum pressure difference between the inlet water pressure and the outlet water pressure, which means that the filter screen 21 may be seriously clogged by dirt at this time. Of course, the flow detection piece can be used for replacing the pressure detection piece, and the automatic control on and off of the electric ball valve can be realized.

In this embodiment, in order to facilitate the installation of the water inlet pressure detecting element 102 and the water outlet pressure detecting element 103, a water inlet detecting port 2911 and a water outlet detecting port 2921 are respectively disposed in the housing end cap 12, wherein the water inlet detecting port 2911 is a cylindrical through hole, accordingly, one end of the water inlet detecting port 2911 is communicated with the water inlet 51, and the other end is installed with a water inlet quick connector 291, and the water inlet pressure detecting element 102 is installed in the water inlet quick connector 291. The water outlet detection port 2921 is an L-shaped detection hole, one end of the water outlet detection port is communicated with the water outlet 52, the other end of the water outlet detection port is provided with a water outlet quick connector 292, and the water outlet pressure detection piece 103 is arranged in the water outlet quick connector 292. Of course, the installation manner of the inlet water pressure detecting member 102 and the outlet water pressure detecting member 103 is not limited thereto.

The blowdown instructions may also be obtained by setting the age of the filter assembly 2, it being understood that the controller 10 has a timer which can record the age of the filter assembly 2, and the timer can also be used to set the age of the filter assembly 2. The controller 10 generates a blowdown instruction when the use time of the filter assembly 2 reaches a preset use time according to a signal transmitted from the timer. Specifically, when the timer records that the service time of the filtering component 2 reaches the preset service time, or when the timer records that the set service time of the filtering component 2 is zero, the timer sends a signal to the controller 10, the controller 10 generates a pollution discharge instruction, and the electric ball valve is controlled to be opened, so that the dirt is washed. For example, a timer may be used to set the filter assembly 2 to be flushed every 10 days, although the user may also set the duration of flushing of the filter assembly 2.

The blowdown instruction can also acquire through handheld terminal, and can understand, the utility model discloses still include the handheld terminal that links to each other with controller 10, handheld terminal has the washing button, presses down the washing button, and handheld terminal send pulse signal to controller 10, and controller 10 produces the blowdown instruction according to receiving pulse signal, and control electric ball valve opens, realizes washing the filth.

It should be noted that the handheld terminal may be a mobile phone, a tablet, or a computer, and the wireless communication module 101 is further added between the handheld terminal and the controller 10, so that the handheld terminal and the controller 10 realize wireless communication. Certainly, can feed back the operating condition of electric ball valve or the operating condition of each detection piece to controller 10, controller 10 sends to handheld terminal after gathering information, makes things convenient for handheld terminal statistics and tracks key references such as pressure of intaking, water pressure, cleaning time and flow to conveniently monitor the cleaning performance, generate accurate reliable cleaning plan, be favorable to promoting user experience and feel.

Of course, the manner of controlling the automatic activation of the electric ball valve is not limited to the above three.

For further promote degree of automation, the utility model discloses still include the dirty content testing spare that links to each other with controller 10, the export of electric ball valve is located to dirty content testing spare to utilize dirty content testing spare to detect the dirty content in electric ball valve exit. The dirt content detecting member may be a water quality detector, and is not limited herein. When the dirt content at the outlet of the electric ball valve is lower than the preset dirt content, the filtering component 2 is completely cleaned, the dirt content detection part sends a signal to the controller 10, the controller 10 controls the electric ball valve to be closed according to the signal sent by the dirt content detection part, and the dirt cleaning is automatically stopped; otherwise, continuously cleaning the dirt. Obviously, dirty content testing spare can realize electronic ball valve self-closing, and degree of automation is high, experiences and feels good.

It can be understood that the utility model discloses still including the blowoff switch 6 who locates second blowoff valve 5, the manual blowoff switch 6 that touches to realize that manual control second blowoff valve 5 opens and close, use when first blowoff valve 3 trouble, convenient blowdown smoothly, the fault rate is little, and the blowdown is reliable.

Correspondingly, the utility model discloses still including setting firmly in the lower housing 13 of shell body 11 bottom, lower housing 13 roughly is the tapered, and its big footpath end and shell body 11 looks butt, second blowoff valve 5 are installed in lower housing 13 bottom. The center of the bottom of the shell body 11 is provided with a lower connecting hole for communicating the inlet of the blow-off pipe 4 and the inlet of the second blow-off valve 5, a lower connecting sleeve 25 is arranged in the lower connecting hole, the peripheral surface of the lower connecting sleeve 25 is provided with an annular groove, an O-shaped sealing ring which is propped against the lower connecting hole to form a sealing structure is arranged in the annular groove, and the peripheral surface of the lower connecting sleeve 25 is clamped with the lower housing 13, so that the lower connecting sleeve 25 is connected with the second blow-off valve 5 and the lower housing 13.

Further, a lower pipe joint 26 is arranged in the lower connecting sleeve 25, an O-shaped sealing ring which is abutted against the inner side surface of the lower connecting sleeve 25 to form a sealing structure is arranged on the outer peripheral surface of the pipe joint 26, and the inner side surface of the lower pipe joint 26 is in threaded connection with the second blow-off valve 5. The top end of the lower pipe joint 26 is lower than the top end of the lower connecting sleeve 25, and the lower connecting sleeve 25 has an abutting annular plate abutting against the supporting framework 22.

For realizing the two-way blowdown, in this embodiment, the utility model discloses still including passing 2 blow off pipes 4 of filter assembly, the both ends of blow off pipe 4 are linked together with first blowoff valve 3 and second blowoff valve 5 respectively to make dirty can be followed first blowoff valve 3 or second blowoff valve 5 and discharged. The sewage discharge pipe 4 is in a hollow tubular shape. Blow off pipe 4 passes filter screen 21's center and shell end cover 12 in proper order, and correspondingly, shell end cover 12 is equipped with the blowoff hole, and top tube head 27 is installed to the blowoff hole, and top tube head 27's outer peripheral face links to each other with first blow off valve 3 with the medial surface clearance fit in blowoff hole, and top tube head 27's medial surface passes through threaded connection's mode, and clearance fit between top tube head 27's medial surface and the blow off pipe 4. In addition, be equipped with between upper tube connector 27 and the first blowoff valve 3 and be used for injecing the two spacing arch and the spacing recess 271 of relative rotation, specifically, spacing recess 271 specifically is for locating the spacing recess of the U type that upper tube connector 27 is close to first blowoff valve 3 one end, and spacing arch is for locating the spacing arch of the U type on first blowoff valve 3. Two groups of mutually symmetrical limiting bulges and limiting grooves 271 are specifically arranged between the upper pipe joint 27 and the first sewage draining valve 3.

In order to prevent the dirt leakage, a sealing ring can be additionally arranged between the sewage discharge pipe 4 and the upper pipe joint 27, correspondingly, an annular mounting groove 272 for mounting the sealing ring is arranged in the upper pipe joint 27, and an O-shaped sealing ring is arranged in the annular mounting groove 272.

Further, the utility model discloses still including locating the dirty pipe seal spare between filter assembly 2 and blow off pipe 4, prevent that dirty by filter assembly 2 and blow off pipe 4 between the gap flow in filter assembly 2. The dirty pipe seal may be a rubber seal, but is not limited thereto.

Further, the utility model discloses still including locating the spacing ring 28 at filter assembly 2 center, spacing ring 28 has the spacing hole that supplies blow off pipe 4 to pass, prevents that 4 positions of blow off pipe from changing, guarantees that blow off pipe 4 is connected reliably with first blowoff valve 3. Specifically, the limiting ring 28 is fixed on the inner wall of the filter screen 21 through four connecting ribs. Preferably, the soil pipe 4 is coaxially disposed with the filtering mesh 21.

Furthermore, the utility model discloses still including the total joint 7 that has water inlet 51 and delivery port 52, the both ends of total joint 7 are located respectively to water inlet 51 and delivery port 52, and water inlet 51 and delivery port 52 independent setting avoid the water purification pollution. Preferably, a pressure regulating valve 8 may be additionally provided at the water inlet 51, and the pressure regulating valve 8 may be manually adjusted to regulate the water inlet pressure of the water inlet 51 within a certain range. The water outlet 52 can be additionally provided with a flowmeter rotor 9 connected with the controller 10, the purified water discharged by the filter screen 21 pushes the flowmeter rotor 9 to rotate, the flowmeter rotor 9 sends a signal to the controller 10, and the controller 10 controls the flow of the water outlet 52.

In addition, the utility model discloses still including covering in the upper shield shell 14 of first blowoff valve 3 periphery for protect first blowoff valve 3.

It should be noted that the controller 10 includes a signal receiving portion, a signal determining portion and a signal transmitting portion, the signal receiving portion is used for receiving an electric signal transmitted by a detecting member such as a pressure detecting member, a flow rate detecting member or a timer, the signal determining portion is electrically connected to the receiving portion so that the signal determining portion is used for determining whether the signal received by the receiving portion is a trigger signal, and the signal transmitting portion is electrically connected to the signal determining portion so that the signal transmitting portion transmits a determination signal generated by the signal determining portion to an executing member such as the first waste valve 3. The specific arrangement mode of the signal receiving part, the signal judging part and the signal sending part can refer to the prior art; in the utility model, only the application scene of the three is changed, but not the substantial improvement is carried out.

Obviously, the controller 10 having this structure is widely applied to existing automatic control devices, such as an MCU, a DSP, or a single chip microcomputer. The key point of the utility model is that the controller 10 correspondingly combines each detecting part and each executing part of the line.

Referring to fig. 12, fig. 13 is a cross-sectional view of a pre-filter according to a second embodiment of the present invention.

In a second embodiment, and with reference to the current view of fig. 12, a first waste valve 3 is provided at the bottom of the housing and a second waste valve 5 is provided at the top of the housing. Correspondingly, the blow-off pipe 4 is fixedly connected with the second blow-off valve 5. The structure of the filter assembly 2 remains unchanged and still achieves the purpose of the present invention.

Synthesize, the utility model provides a leading filter can open first blowoff valve 3 or second blowoff valve 5 alternatively, makes dirty discharge from first blowoff valve 3 or second blowoff valve 5. In view of first blowoff valve 3 and second blowoff valve 5 locate the both ends of casing to realize two-way blowdown, reduce because of the risk that single blowoff valve damaged and can't realize the blowdown, the fault rate is lower, and the blowdown is more smooth, consequently the utility model provides a leading filter's blowdown reliability is higher.

The pre-filter provided by the present invention is described in detail above, and the principle and the implementation of the present invention are explained by applying specific examples, and the descriptions of the above examples are only used to help understanding the method and the core idea of the present invention; meanwhile, for the general technical personnel in the field, according to the idea of the present invention, there are changes in the specific implementation and application scope, to sum up, the content of the present specification should not be understood as the limitation of the present invention.

Claims (10)

1. A pre-filter, comprising:

a housing;

a filter assembly (2) disposed within the housing;

a water inlet (51) for flow of flushing liquid into the filter assembly to flush dirt;

and the first blow-down valve (3) and the second blow-down valve (5) are arranged at two ends of the shell, are respectively communicated with the filtering component (2), and are used for alternatively discharging washed dirt.

2. The prefilter of claim 1 wherein said first drain valve (3) is a motorized ball valve, and further comprising a controller (10) connected to said motorized ball valve for controlling the opening and closing of said motorized ball valve.

3. The prefilter of claim 2 further comprising:

a water outlet (52) for discharging purified water;

a water inlet pressure detecting member (102) provided at the water inlet (51) and detecting a water inlet pressure;

a water outlet pressure detection member (103) provided at the water outlet (52) and detecting a water pressure;

the water inlet pressure detection piece (102) and the water outlet pressure detection piece (103) are connected with the controller (10), and the controller (10) controls the electric ball valve to be opened when the difference between the water inlet pressure and the water outlet pressure reaches a preset difference value according to signals sent by the water inlet pressure detection piece (102) and the water outlet pressure detection piece (103).

4. The prefilter of claim 2 further comprising:

the controller (10) is provided with a timer for recording the service time of the filter assembly (2), and the controller (10) is used for controlling the electric ball valve to be opened when the service time of the filter assembly (2) reaches a preset service time according to a signal sent by the timer.

5. The prefilter of claim 2 further comprising:

and the handheld terminal is connected with the controller (10) and is provided with a cleaning button, and when the controller (10) receives a signal sent by the cleaning button, the electric ball valve is controlled to be opened.

6. The prefilter of claim 2 further comprising:

the dirty content detection piece is connected with the controller (10), arranged at the outlet of the electric ball valve and used for detecting the dirty content at the outlet of the electric ball valve; the controller (10) is used for controlling the electric ball valve to be closed when the dirt content of the outlet of the electric ball valve is lower than the preset dirt content according to the signal sent by the dirt content detecting part.

7. The prefilter of any one of claims 1 to 6 wherein said second blowoff valve (5) is a manual ball valve, further comprising a blowoff switch (6) provided on said second blowoff valve (5) for manually controlling the opening and closing of said second blowoff valve (5).

8. The pre-filter according to claim 2, characterised in that it further comprises a drain (4) passing through the filtering assembly (2) and communicating at both ends with the first drain valve (3) and the second drain valve (5) respectively, for the passage of the dirt.

9. The prefilter of claim 8 wherein said housing comprises a housing body (11) and a housing end cap (12) attached to said housing body (11), said filter assembly (2) comprising:

a filter screen (21);

a supporting framework (22) sleeved between the filter screen (21) and the shell body (11);

detachably be fixed in filter screen (21) are close to filter baffle (23) of second blowoff valve (5) one end, filter screen (21) with the flush fluid that flows in between support chassis (22) is used for promoting filter baffle (23) remove the messenger filter screen (21) are kept away from shell end cover (12) are in order to switch on water inlet (51) with the central die cavity of filter screen (21).

10. The pre-filter according to claim 9, wherein the filter assembly (2) further comprises:

overlap in filter screen (21) periphery is used for the assistance filter screen (21) resets wash elastic component (24), the inside wall of supporting framework (22) be equipped with the butt step face that the first end of washing elastic component (24) offseted, filter screen (21) are kept away from the one end of filtering baffle (23) be equipped with wash the butt flange that the second end of elastic component (24) offseted.

Images