CN100348293C

CN100348293C - Controller of self-cleaning filter

Info

Publication number: CN100348293C
Application number: CNB2005101005342A
Authority: CN
Inventors: 黄庆
Original assignee: Individual
Current assignee: Individual
Priority date: 2005-10-19
Filing date: 2005-10-19
Publication date: 2007-11-14
Anticipated expiration: 2025-10-19
Also published as: CN1772333A

Abstract

The present invention discloses a controller for self-cleaning filters, which comprises a pressure difference detecting device, a cleaning driver linked with a dirt sucking device assembly in the axial direction through a piston push rod, and a first chamber, a second chamber, a third chamber and a pressure relieving chamber which are arranged at the outer side of a piston cavity from the inner part to the outer part, wherein the first chamber and the second chamber as well as the second chamber and the third chamber are respectively sealed in a liquid sealing mode by flexible thin membranes of which the middle parts are connected together, and the third chamber and the pressure releasing chamber are sealed in a unidirectional liquid sealing mode by tensioning inwards flexible sealing pad and a core shaft sheathed with a return spring. The piston cavity is communicated with the first chamber, the first chamber and the third chamber are mutually communicated and are both communicated with a hollow cavity on the outer wall of a fine filter screen, and the second chamber is connected with a unidirectional water outlet of a low pressure cavity of the pressure difference detecting device. The pressure difference detecting device can be further positioned outside the cleaning driver. The present invention can realize the complete automatic running of the controller and also has the advantages of compact structure, reliable running, etc.

Description

The control device of self-cleaning strainer

Technical field

The present invention relates to a kind of industrial circulating water be carried out the filter of purified treatment, relate in particular to a kind of automaton of self-cleaning strainer.

Background technology

Industrial circulating water is carried out its structure of in-line purification processing filters generally as shown in Figure 1, former water is from water inlet 91 input coarse filtration chambeies 92, through coarse strainer 93 with former water in the interception of the bigger impurity of particle, enter fine filtering chamber 94 again, further filter the back water purification from delivery port 96 discharges through fie screen 95.After the regular hour filtration, the inwall of fie screen 94 tends to gather one deck impurity, inside and outside fie screen, produce a pressure reduction that progressively increases, when this pressure reduction is excessive, will have influence on the normal rate of filtration, for this reason, generally need be in the cylindricality fine filtering cavity that fie screen surrounds vertically central authorities be provided with dirt sucking device assembly 6, be arranged at intervals with suction nozzle 61 on the dirt sucking device assembly, when anti-cleaning is blowdown, sewage draining valve 3 is opened automatically, the dirt sucking device assembly is on the one hand by hydraulic motors 7 driven rotary, simultaneously also by cleaning the axial translation of driver drives along the fine filtering chamber, thereby realizes the comprehensive cleaning to the impurity that is adsorbed on the fie screen inner wall surface.In this backwash process, current can continue to flow, thereby can realize the production of continuous and automation.

Self-cleaning strainer wants to realize above-mentioned functions, and the device of in good time detection inside and outside differential pressure must be arranged, and when this pressure reduction met or exceeded preset threshold, above-mentioned dirt sucking device total performance should be moved, and starts backwash process; Along with the carrying out of backwash process, inside and outside differential pressure progressively reduces, and the dirt sucking device assembly also correspondingly stops action in good time, in order to avoid influence normal recirculated water filter efficiency, moves when this pressure reduction increases to aforesaid threshold values next time again.

The pressure test device of existing self-cleaning strainer, its general structure can be as shown in Figure 2: two adjacent sealed chamber are set: high pressure chest 51 and low-pressure cavity 52 in the inside of checkout gear, high pressure chest communicates with the cavity of fie screen 95 inwalls, and low-pressure cavity communicates with the cavity of fie screen outer wall; Elastic film 53 liquid sealings that are fixed by a periphery between high pressure chest and the low-pressure cavity separate; In low-pressure cavity,, be provided with offset plate 54 near this elastic film 53; On this low-pressure cavity wall, also be provided with a delivery port 55 and be used for the conical surface plug 56 of this delivery port of liquid sealing, the front end of conical surface plug passes delivery port, and be tight against on offset plate by the holddown spring 57 of its rear end, the other end of holddown spring is by a jacking block 58 and to regulate bolt 59 fixing.The operation principle of this pressure test device is: when the hydraulic pressuring difference that produces inside and outside fie screen progressively increases to setting value, the suffered hydraulic pressure in the both sides of elastic film also can progressively increase, up to can conical surface plug being backed down by the pressure that offset plate overcomes spring, make delivery port open, realize detecting the function of pressure reduction in view of the above in good time.The setting of jacking block and adjusting bolt is in order to determine, regulate above-mentioned certain threshold level or setting value as required.

Pressure test device in the control device of existing self-cleaning strainer generally all is to be arranged separately on the housing 1 of filter, then be used for installing the piston mandril that cleans in the driver in the end 11 of filter, piston and plunger shaft component assemblies 21 such as (piston cylinders), so that piston mandril can be along fine filtering chamber 94 axially translation and drive dirt sucking device assembly 6 back and forth, miscellaneous part in the cleaning driver except associated components such as piston mandril and piston generally also is independently to be installed on the filter housings 1, that is to say piston mandril, piston and plunger shaft component assemblies 21 such as (piston cylinders), clean the miscellaneous part except associated components such as piston mandril and piston in the driver, pressure test device is the diverse location on the housing of filter of being placed in each other, make the structure of control device of filter seem very loose, scrappy, not compact, install also more complicated.

In addition, the cleaning driver of existing self-cleaning strainer is general by electronic control, that is: when pressure test device detects prearranged signal, drive the piston mandril that cleans in the driver by an electro-motor (not shown) and do axially-movable, yet, electronic control is insecure often, especially the signal that provides by pressure reduction is as the instruction of starter, at least just can realize real-time control after needing to convert pressure signal to the signal of telecommunication, its reliability always is difficult to gratifying; And filter needs power supply just can work, and fails to realize up hill and dale full automatic self-cleaning filtration, promptly automatic anti-cleaning and filtering.

Summary of the invention

For overcoming the defective of above-mentioned prior art, technical problem to be solved by this invention is intended to provide the control device of the higher self-cleaning strainer of a kind of full automation and reliability.

Further aim of the present invention provides a kind of control device of self-cleaning strainer of compact conformation.

For solving the problems of the technologies described above, the present invention proposes a kind of control device of self-cleaning strainer, the pressure test device that comprises the fie screen inside and outside differential pressure that is used to detect filter, be used to drive the cleaning driver that the dirt sucking device assembly is done axially-movable, described pressure test device inside is provided with two adjacent sealed chamber: high pressure chest and low-pressure cavity, high pressure chest communicates with the cavity of fie screen inwall, and low-pressure cavity communicates with the cavity of fie screen outer wall; Described low-pressure cavity wall is provided with the delivery port by described fie screen inside and outside differential pressure control folding, and described delivery port is opened when described inside and outside differential pressure surpasses setting value in good time; Described cleaning driver comprise with the piston mandril of the axial interlock of dirt sucking device assembly and piston and, at parallel successively from inside to outside first chamber, second chamber, the 3rd chamber, the pressure release chamber that is provided with in the outside of plunger shaft, described first chamber and second chamber are realized liquid sealing by first fexible film, second chamber and the 3rd chamber by second fexible film, and the middle part of described first fexible film and second fexible film is connected together mutually by connecting assembly; Between described the 3rd chamber and the pressure release chamber opening is set, the mandrel that is socketed with return spring is installed in the described opening, described mandrel one end and described connecting assembly are rigidly connected, the other end of described mandrel is being positioned at the blanking cover that described pressure release chamber one side is provided with the described opening of shutoff, and described blanking cover is strained to the inside by described return spring and realized unidirectional liquid sealing between the 3rd chamber and the pressure release chamber; The plunger shaft that is positioned at described piston outer end communicates with described first chamber, described first chamber, the 3rd chamber are interconnected and all communicate with the cavity of fie screen outer wall, and described second chamber then communicates with the unidirectional delivery port of the low-pressure cavity of described pressure test device.

On the said structure basis, described pressure test device can be set directly at the outside that is positioned at described cleaning driver, described second chamber directly communicates with the unidirectional delivery port of the low-pressure cavity of described pressure test device by passage default in the automaton housing.

After adopting the technical scheme of the invention described above, because the dirt sucking device assembly of filter and the axial interlock of piston mandril that cleans in the driver, the reciprocating motion of piston then relies on the dynamic change of hydraulic pressuring difference and this pressure reduction to control and drive fully, and assist the dirt sucking device assembly to finish the backwash action, whole process need not electronic equipment or driven by power, only the action that relies on machinery to establish parts just can realize automatic backwash, so reliability is higher; In addition, the miscellaneous part in the cleaning driver can be set directly at the outer end of plunger shaft, seems very compact.

By pressure test device being set directly at the outer end that is positioned at described cleaning driver, rather than independently be arranged on the housing of filter, make checkout gear and drive unit be connected as a single entity, can realize directly being communicated with by passage default in the housing so between the two, no longer be communicated with by water pipe independently, more compact structure not only also can further improve the reliability of equipment.

Below will be by a specific embodiment and in conjunction with the accompanying drawings to feature of the present invention, principle, the course of work and advantage and be elaborated.

Description of drawings

Fig. 1 is the structural representation of existing self-cleaning strainer;

Fig. 2 is the structural representation of automatic pressure test device;

Fig. 3 is the cross-sectional view of a kind of embodiment of control device of self-cleaning strainer of the present invention;

The specific embodiment

With reference to accompanying drawing 2 and Fig. 3, in a kind of embodiment of the control device of self-cleaning strainer of the present invention, comprise the pressure test device 5 of the fie screen inside and outside differential pressure that is used to detect filter, be used to drive the cleaning driver 2 that dirt sucking device assembly 6 is done axially-movable.This pressure test device can adopt the concrete structure described in aforementioned background art Fig. 2, portion is provided with two adjacent sealed chamber within it: high pressure chest 51 and low-pressure cavity 52, high pressure chest communicates with the cavity of fie screen inwall, and low-pressure cavity communicates with the cavity of fie screen outer wall; Elastic film 53 liquid sealings that are fixed by a periphery between high pressure chest and the low-pressure cavity separate; In low-pressure cavity,, be provided with offset plate 54 near this elastic film; On this low-pressure cavity wall, also be provided with a delivery port 55 and be used for the conical surface plug 56 of this delivery port of liquid sealing, the front end of conical surface plug passes delivery port, and be tight against on offset plate 54 by the holddown spring 57 of its rear end, the other end of holddown spring is by a jacking block 58 and to be used for regulating the adjusting bolt 59 of pretightning force of this spring fixing, obviously, thisly realize that by pressure reduction the mode of unidirectional control do not limit to a kind of concrete structure shown in Figure 3, have flexible sealing gasket such as use and replace the conical surface among Fig. 2 can reach identical functions (the unidirectional liquid sealing structure of the 3rd chamber and pressure release chamber also can) as described later fully.As long as and other structures can be when the fie screen inside and outside differential pressure be threshold value above setting value, this delivery port is opened at once, makes that the water in the above-mentioned low-pressure cavity is exported in good time, otherwise this delivery port 55 is closed and liquid sealing gets final product;

In Fig. 3, the cleaning driver comprises piston mandril 211 and the piston 212 with dirt sucking device assembly 6 axial interlocks, and in the outside of plunger shaft 213, parallel successively from inside to outside first chamber 22 that is provided with of control device of the present invention, second chamber 23, the pressure release chamber 25 of the 3rd chamber 24 and the decompression that can outwards sluice, the housing 26 of aforementioned like this each chamber just can successfully be installed with the housing 214 of plunger shaft or be assembled together, can not interfere phenomenon even piston is outside when mobile yet, first chamber 22 also can add man-hour in making easily, reserve process pipe, realize with plunger shaft 213 smooth, be communicated with reliably, have simple installation, reliably, advantages such as compact conformation.

In Fig. 3, first chamber and second chamber are by first fexible film 225, second chamber and the 3rd chamber are realized liquid sealing by second fexible film 235, between the 3rd chamber and pressure release chamber, then be provided with opening 241, this opening is provided with flexible gasket 263 being positioned at pressure-releasing chamber chamber 25 1 sides, this flexible gasket is by mandrel 262, the spring 261 of mandrel return and the nut 264 of location flexible gasket 263 are strained to the inside, as long as making these spring 261 1 ends fixes, the other end is socketed on this mandrel and the pretightning force that pre-sets spring just can realize unidirectional liquid sealing between the 3rd chamber 24 and the pressure release chamber 25, and promptly current only can flow to pressure release chamber 25 from the 3rd chamber 24; As the liquid flow unidirectional control device in the above-mentioned mechanical pressure test device, herein one-way sealing structure is not limited to a kind of scheme shown in Figure 3 among the present invention, it generally speaking is exactly this end that is positioned at this opening 241 at mandrel 262, be provided with the blanking cover of this opening 241 of shutoff in a side that is positioned at described pressure release chamber 25, blanking cover is strained to the inside by return spring and is realized unidirectional liquid sealing between the 3rd chamber and the pressure release chamber, because so unidirectional liquid sealing structure obviously also has other schemes, such as this end of mandrel being designed to conical surface device, one-body molded with described mandrel, also can reach above-mentioned effect or function by return spring.

The middle part of first fexible film 225 and second fexible film 235 is connected together mutually by the connecting assembly 27 among Fig. 3, and mandrel 262 is rigidly connected at the other end and this connecting assembly 27 with respect to described flexible gasket 263; The concrete structure of connecting assembly can adopt mode as shown in Figure 3, comprise that the rubber cushion that lays respectively at first fexible film, the second fexible film both sides is or/and compressing tablet 272, and with these rubber cushions or/and the fixed connecting pieces such as screw 273 that compressing tablet links together, and the rubber cushion 28 that is positioned on the left of first fexible film preferably also is provided with stop outer ring 281, in case the centre of first fexible film, second fexible film when backwash outside transition distortion or outside move, guarantee the present invention after long-term the use, the reliability of these parts.

The plunger shaft that is positioned at the piston outer end need communicate with first chamber, and first chamber, the 3rd chamber need be interconnected and all will communicate with the cavity of fie screen outer wall, and second chamber then will communicate with the unidirectional delivery port of the low-pressure cavity of pressure test device.

As shown in Figure 3, the present invention can be set directly at the outside that is positioned at described cleaning driver with pressure test device 5, described second chamber directly communicates with the unidirectional delivery port of the low-pressure cavity of described pressure test device by passage default in the automaton housing, no longer flexible pipe or the metal tubes with special use is communicated with second chamber and aforesaid unidirectional delivery port, can further improve the compactedness and the reliability of control device of the present invention like this.

Operation principle of the present invention and process are such: when the filter normal filtration, the pressure reduction between the high and low pressure chamber in the pressure test device is less, and delivery port is closed; Meanwhile, first chamber and the 3rd chamber pressure keep balance, and the flexible gasket that is arranged in pressure-releasing chamber makes the opening between the 3rd chamber and the pressure-releasing chamber be in closed condition by mandrel and return spring tension, and the dirt sucking device assembly is not counter to clean action.Along with continuing of filtering carries out, when the impurity that gathers when the inwall of fie screen makes the pressure reduction that produces inside and outside the fie screen progressively increase to preset threshold, delivery port in the pressure test device is backed down, water in the low-pressure cavity enters second chamber by this delivery port rapidly by internal pipeline, make second chamber pressure increase, thereby promote mandrel fast and move and open pent before this flexible gasket laterally, the hydraulic pressure of the 3rd chamber through this opening to the pressure-releasing chamber pressure release, at this moment, the same with existing filter for installation, with reference to figure 1, the sewage draining valve 3 of the filter that communicates with the 3rd chamber, also can open because of the variation of pressure reduction or water flow inside is corresponding in good time, filter need be by other external force, just begin to carry out automatically the backwash action, because first chamber, the 3rd chamber and plunger shaft all communicate, therefore the hydraulic pressure in first chamber and the plunger shaft all can reduce in the lump fast because of the pressure release of the 3rd chamber, the direction of arrow is the direction of current when instead cleaning action launching among Fig. 3, piston mandril relies on the pressure of fie screen inwall will promote piston and moves (the empty direction of arrow among the figure) laterally, and drives the dirt sucking device assembly simultaneously and outwards do axially-movable.After piston and push rod are finished an impulse stroke, import and export water pressure in the filter state that restores balance, just low-pressure cavity intake pressure in the pressure test device and high pressure chest obtain balance, at this moment, delivery port is closed by conical surface plug under the effect of spring, second chamber no longer pressurizes, mandrel also relies on return spring to be able to return, and seal the opening in the 3rd chamber and blowdown chamber, like this, the working cycles of backwash is finished in plunger shaft water filling and promote piston and move to the inside and reset again.

From the above mentioned, whole backwash action all relies on the variation of the hydraulic pressuring difference that exists in the filter itself to finish automatically, and reliability is very high.First chamber, second chamber, the 3rd chamber and blowdown chamber are assemblied in the outside of plunger shaft, even pressure test device also can be assemblied in the outside of cleaning driver as shown in Figure 3, the miscellaneous part of pressure test device and cleaning driver need independently be set on the housing of filter again, thereby the detection of the existing filter of comparing, control device, use the compactedness of control device of the present invention, operational reliability that good improvement is all arranged.

Claims

1. the control device of a self-cleaning strainer, the pressure test device that comprises the fie screen inside and outside differential pressure that is used to detect filter, be used to drive the cleaning driver that the dirt sucking device assembly is done axially-movable, described pressure test device inside is provided with two adjacent sealed chamber: high pressure chest and low-pressure cavity, high pressure chest communicates with the cavity of fie screen inwall, and low-pressure cavity communicates with the cavity of fie screen outer wall; Described low-pressure cavity wall is provided with the delivery port by described fie screen inside and outside differential pressure control folding, and described delivery port is opened when described inside and outside differential pressure surpasses setting value in good time; It is characterized in that: described cleaning driver comprise with the piston mandril of the axial interlock of dirt sucking device assembly and piston and, at parallel successively from inside to outside first chamber, second chamber, the 3rd chamber, the pressure release chamber that is provided with in the outside of plunger shaft, described first chamber and second chamber are realized liquid sealing by first fexible film, second chamber and the 3rd chamber by second fexible film, and the middle part of described first fexible film and second fexible film is connected together mutually by connecting assembly; Between described the 3rd chamber and the pressure release chamber opening is set, the mandrel that is socketed with return spring is installed in the described opening, described mandrel one end and described connecting assembly are rigidly connected, the other end of described mandrel is being positioned at the blanking cover that described pressure release chamber one side is provided with the described opening of shutoff, and described blanking cover is strained to the inside by described return spring and realized unidirectional liquid sealing between the 3rd chamber and the pressure release chamber; The plunger shaft that is positioned at described piston outer end communicates with described first chamber, described first chamber, the 3rd chamber are interconnected and all communicate with the cavity of fie screen outer wall, and described second chamber then communicates with the unidirectional delivery port of the low-pressure cavity of described pressure test device.

2. the control device of a kind of self-cleaning strainer as claimed in claim 1, it is characterized in that: described blanking cover comprises the nut that is installed in the flexible gasket on the described mandrel and is used to locate described flexible gasket.

3. the control device of a kind of self-cleaning strainer as claimed in claim 1, it is characterized in that: described blanking cover is a conical surface device, and is one-body molded with described mandrel.

4. as the control device of claim 1,2 or 3 described a kind of self-cleaning strainers, it is characterized in that: described pressure test device is positioned at the outside of described cleaning driver, and described second chamber directly communicates by the unidirectional delivery port of the passage in the described control device housing with the low-pressure cavity of described pressure test device.