CN101816847B

CN101816847B - Back washing filter

Info

Publication number: CN101816847B
Application number: CN201010168810XA
Authority: CN
Inventors: 韦文术; 王伟; 张龙涛; 宋艳亮; 郭新伟
Original assignee: Beijing Tiandi Marco Electro Hydraulic Control System Co Ltd
Current assignee: Beijing Tianma Intelligent Control Technology Co Ltd
Priority date: 2010-05-05
Filing date: 2010-05-05
Publication date: 2012-02-29
Anticipated expiration: 2030-05-05
Also published as: CN101816847A

Abstract

The invention discloses a back washing filter which comprises a valve body, wherein the valve body is provided with a liquid inlet, a liquid outlet and a drain outlet; a plurality of valve core components and a plurality of filter core components are arranged in the valve body; communicating channels are arranged between the valve core components and the filter core components; each valve core component comprises a liquid valve core and a drain valve core which are arranged back to back; small springs are arranged between liquid valve cores and drain valve cores; the rear ends of the drain valve cores are provided with push rods. The back washing filter also comprises a filter guide core, a non return valve and a pilot valve; the liquid outlet is communicated with liquid cavities at the rear ends of the pushing rods sequentially though the filter guide core, the non return valve and the pilot valve and is used for controlling conversion between a normal operating position and a back washing position. The invention has the advantages of convenient use and effectively protecting the service life of the filter core.

Description

Backwash filter

Technical field

The present invention relates to a kind of filter, relate in particular to a kind of backwash filter.

Background technology

Continuous popularization along with support electricity hydraulic control system needs filter core to possess function of on-line cleaning.

Backwash filter of the prior art adopts the backwash filter of manual backwash filter or employing bi-bit bi-pass changement.

Above-mentioned prior art comprises following shortcoming at least:

Adopt manual backwash filter to need manual work to pull the backwash handle and carry out backwash, it has increased labor's labour intensity greatly; Because the system pressure fluctuation, when inlet pressure reduced, the liquid outlet fluid pressure was high than inlet, and high pressure liquid flows out from the filter core the inside to the outside, can produce filter core bulge phenomenon, greatly reduces the service life of filter core.

Summary of the invention

The purpose of this invention is to provide a kind of easy to usely, and can effectively protect the backwash filter in the service life of filter core.

The objective of the invention is to realize through following technical scheme:

Backwash filter of the present invention; Comprise valve body, have inlet, liquid outlet, sewage draining exit on the said valve body, be provided with a plurality of core assemblies, a plurality of element kit in the said valve body; Be provided with communication passage between core assembly and the element kit; Said core assembly comprises feed liquor spool and the blowdown spool that is provided with back-to-back, is provided with little spring between said feed liquor spool and the blowdown spool, and the rear end of said blowdown spool is provided with push rod; Also comprise guide's filter core, check valve, pilot valve, said liquid outlet is successively through communicating with the sap cavity of said push rod rear end behind said guide's filter core, check valve, the pilot valve.

Technical scheme by the invention described above provides can be found out; Backwash filter of the present invention; Owing to be provided with a plurality of core assemblies, a plurality of element kit in the valve body, be provided with communication passage between core assembly and the element kit, core assembly comprises feed liquor spool and the blowdown spool that is provided with back-to-back; Be provided with little spring between feed liquor spool and the blowdown spool, the rear end of blowdown spool is provided with push rod; Also comprise guide's filter core, check valve, pilot valve, liquid outlet is successively through communicating with the sap cavity of push rod rear end behind said guide's filter core, check valve, the pilot valve.Through the liquid after the element kit filtration; Behind guide's filter element filtering, give the pilot valve feed flow through check valve, can ensure to the cleannes of the liquid of pilot valve feed flow; Reduce the spoilage of pilot valve; System pressure sharply descends when the backwash filter backwash simultaneously, and the liquid that check valve can ensure to the pilot valve feed flow separates with system liquid, with the reliable switching-over of assurance pilot valve and the normal operation of backwashing function.Easy to use, and can effectively protect service life of filter core.

Description of drawings

Fig. 1 is the cross-sectional view of backwash filter of the present invention;

Fig. 2 is the Facad structure sketch map of backwash filter of the present invention;

Fig. 3 is the systematic schematic diagram of backwash filter of the present invention.

Among the figure: the 1-valve body; The 2-element kit; The 3-check valve; 4-guide's filter core; 5-feed liquor valve seat; 6-feed liquor spool; The 7-little spring; 8-blowdown spool; 9-crosses the liquid cover; The 10-big spring; The 11-push rod; The 12-swivel nut; The 13-pilot valve; The 14-fluid proportion plate; The 15-rebound; The 16-core assembly; The A-inlet; The B-liquid outlet; C-feed liquor intercommunicating pore; D-fluid intercommunicating pore; The E-sewage draining exit; The communication passage of F-core assembly and element kit; The G-intercommunicating pore; 17-operate as normal position; 18-backwash working position.

The specific embodiment

Backwash filter of the present invention, the specific embodiment that it is preferable such as Fig. 1, Fig. 2, shown in Figure 3:

Comprise valve body 1, have inlet A, liquid outlet B, sewage draining exit E on the said valve body 1, be provided with a plurality of core assembly 16, a plurality of element kit 2 in the valve body 1, be provided with communication passage between core assembly 16 and the element kit 2.

Specifically can in valve body 1, be provided with two core assemblies 16, two 2, two core assembly 16 correspondences of element kit are provided with two inlet A, two element kit 2 correspondences are provided with two liquid outlet B, two inlet A are interconnected, two liquid outlet B are interconnected.

Said core assembly 16 comprises the feed liquor spool 6 and blowdown spool 8 that is provided with back-to-back, is provided with little spring 7 between said feed liquor spool 6 and the blowdown spool 8, and the rear end of said blowdown spool 8 is provided with push rod 11;

Also comprise guide's filter core 4, check valve 3, pilot valve 13 etc., said liquid outlet B communicates with the sap cavity of said push rod 11 rear ends through said guide's filter core 4, check valve 3, pilot valve 13 backs successively, is used to control the switching between operate as normal position and the backwash position.

Feed liquor spool 6 constitutes the feed liquor sealing pairs with feed liquor valve seat 5, said blowdown spool 8 with cross liquid cover 9 and constitute the blowdown sealing pairs, said blowdown sealing pair is the sealing pair of hard sealing structure.

Said blowdown spool 8 is a fairlead with the inwall of said feed liquor spool 6.

Pilot valve 13 is fixed on the top of said valve body 1 through rebound 15, and communicates with said valve body 1 inner liquid road through fluid proportion plate 14.

Backwash filter of the present invention has guide's filter core and check valve, the liquid after filtering through element kit; Behind guide's filter element filtering; Give the pilot valve feed flow through check valve, can ensure to the cleannes of the liquid of pilot valve feed flow, reduce the spoilage of pilot valve; System pressure sharply descends when the backwash filter backwash simultaneously; But can guarantee owing to have check valve, separate for the liquid of pilot valve feed flow with system liquid, with the reliable switching-over of assurance pilot valve and the normal operation of backwashing function.Can avoid simultaneously producing filter core bulge phenomenon, the service life of improving element kit greatly because pressure oscillation causes the phenomenon that high pressure liquid flows out from the filter core the inside to the outside.The service life that blowdown spool and mistake liquid cover adopt hard sealing structure can improve its backwash filter greatly.

Through practical implementation embodiment, the present invention is carried out detailed description below:

Again referring to Fig. 1, Fig. 2, Fig. 3; Have inlet A, liquid outlet B, sewage draining exit E on the valve body 1; At least two element kits 2, two core assemblies 16, check valve 3 and guide's filter cores 4 are housed on the valve body 1; Rebound 15 links to each other with valve body 1 through screw, and fluid proportion plate 14 is fixed on the rebound 15 through screw, and pilot valve 13 is fixed on the fluid proportion plate 14 through screw.

Described core assembly 16 comprises feed liquor valve seat 5, feed liquor spool 6, little spring 7, blowdown spool 8, liquid cover 9, big spring 10, push rod 11 and swivel nut 12 orders are installed excessively; Said blowdown spool 8 with cross liquid cover 9 and constitute the hard sealing structure sealing pairs, feed liquor spool 6 constitutes the feed liquor sealing pairs with feed liquor valve seat 5.Described blowdown spool 8 serves as that compression little spring 7 is arranged between guiding and feed liquor spool 6 and the blowdown spool 8 with the inwall of feed liquor spool 6.

Described core assembly 16; When inlet A does not have high pressure liquid or inlet A high pressure liquid and is lower than the communication passage F place high pressure liquid pressure of core assembly and element kit; The feed liquor spool 6 of core assembly 16 and blowdown spool 8 are under the pretightning force effect of little spring, and feed liquor spool 6 and feed liquor valve seat 5 formation sealing pairs are in closed condition, blowdown spool 8 and cross liquid cover 9 formation sealing pairs and also are in closed condition.

Backwash filter operation principle of the present invention introduction is following, and is as shown in Figure 3:

(1) the operate as normal position 17:

When this working position, when not having high pressure liquid or inlet A high pressure liquid at inlet A and be lower than the communication passage F place high pressure liquid pressure of core assembly and element kit, this moment, feed liquor spool 6 all was in closed condition with blowdown spool 8; When the pressure of inlet A was higher than the communication passage F place high pressure liquid pressure of core assembly and element kit, feed liquor spool 5 was opened, and high pressure liquid is filtered the back through core assembly 16, communication passage F and element kit 2 and flowed out from liquid outlet B, and completion is to the filtration of high pressure liquid;

(2) the backwash working position 18:

When this working position, core assembly 16 is in backwash state working position, cleans one of them element kit 2, such as cleaning the left side filter core.High pressure liquid part after element kit 2 filters is given pilot valve 13 feed flows behind guide's filter core 4, check valve 3; Control pilot valve 13 makes wherein function mouth action; Make high pressure liquid behind guide's filter core 4, check valve 3, pilot valve 13; Enter into the sap cavity of push rod 11 rear ends, push rod 11 is opened blowdown spool 8, thereby control left hand valve core assembly 16 commutates to the backwash working position; The feed liquor spool 6 of this core assembly 16 is closed; Blowdown spool 8 is opened with sewage draining exit E and is communicated, because two liquid outlet B are communicated with by fluid intercommunicating pore D, the high pressure liquid part after right hand valve core assembly 16 and element kit 2 normal filtration flows into the outside outflow of the inside of left side element kit 2 by left side element kit 2 through fluid intercommunicating pore D; The dirt of the outer surface of left side element kit 2 outside sewage draining exit E discharges automatically controlled backwash filter, is accomplished a cleaning process of left side element kit 16.In like manner can accomplish cleaning to other element kits 16 through other function mouths of control pilot valve 13.

Backwash filter of the present invention has guide's filter core 4 and check valve 3; Through the liquid after element kit 16 filtrations, after 4 filtrations of guide's filter core, give pilot valve 13 feed flows through check valve 3; Can ensure to the cleannes of the liquid of pilot valve 13 feed flows; Reduce the spoilage of pilot valve 13, system pressure sharply descends when the backwash filter backwash simultaneously, but can guarantee owing to having check valve 3; Separate for the liquid of pilot valve 13 feed flows with system liquid, with the reliable switching-over of assurance pilot valve 13 and the normal operation of backwashing function.

Among the present invention, have the guide's filter core to the independent feed flow of pilot valve, can realize classified filtering, promptly the element kit precision does not receive the requirement of pilot valve to the working media cleannes.(as: when the pilot valve filtering accuracy need be higher than 40um, as long as guide's filter filtering accuracy is when being higher than 40um, and main Filter Precision can be lower than 40um); Have one-way valve, can guarantee the reliable switching-over of spool; Can solve after filter core stops up; Existing filter occurs because the system pressure fluctuation; When inlet pressure reduced, it was high than inlet to produce the liquid outlet fluid pressure, when high pressure liquid flows out from the filter core the inside to the outside; Produce the shortcoming of filter core bulge phenomenon, the service life of having improved backwash filter and backwash filter core greatly; The present invention can realize backwashing function through the control pilot valve, greatly reduces labor's labour intensity.

The above; Be merely the preferable specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, any technical staff who is familiar with the present technique field is in the technical scope that the present invention discloses; The variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.

Claims

1. a backwash filter comprises valve body, has inlet, liquid outlet, sewage draining exit on the said valve body; It is characterized in that; Be provided with a plurality of core assemblies, a plurality of element kit in the said valve body, be provided with communication passage between core assembly and the element kit, said core assembly comprises feed liquor spool and the blowdown spool that is provided with back-to-back; Be provided with little spring between said feed liquor spool and the blowdown spool, the rear end of said blowdown spool is provided with push rod;

Also comprise guide's filter core, check valve, pilot valve, said liquid outlet is successively through communicating with the sap cavity of said push rod rear end behind said guide's filter core, check valve, the pilot valve.

2. backwash filter according to claim 1 is characterized in that, said blowdown spool is a fairlead with the inwall of said feed liquor spool.

3. backwash filter according to claim 2 is characterized in that, described feed liquor spool and feed liquor valve seat constitute the feed liquor sealing pair, said blowdown spool with cross the liquid cover and constitute the blowdown sealing pair, said blowdown sealing pair is the sealing pair of hard sealing structure.

4. backwash filter according to claim 3; It is characterized in that; Be provided with two core assemblies, two element kits in the said valve body, two core assembly correspondences are provided with two inlets, and two element kit correspondences are provided with two liquid outlets; Two inlets are interconnected, and two liquid outlets are interconnected.

5. backwash filter according to claim 4 is characterized in that, said pilot valve is fixed on the top of said valve body through rebound, and communicates with the liquid road of said valve inner through fluid proportion plate.