CN2250798Y

CN2250798Y - Filter with filtering condition dynamic monitor

Info

Publication number: CN2250798Y
Application number: CN 95246505
Authority: CN
Inventors: 翁继祖
Original assignee: Individual
Current assignee: Individual
Priority date: 1995-11-24
Filing date: 1995-11-24
Publication date: 1997-04-02
Anticipated expiration: 2005-11-24

Abstract

The utility model belongs to a filter, which is mainly composed of a filter casing, a filtering net or a filtering core, etc. The utility model is characterized in that the filter casing is connected with a dynamic monitoring device for filtering status; the device is mainly composed of a piston, a cylinder body, a reset spring, etc.; both ends of the cylinder body are respectively provided with an opening which is respectively communicated with the inlet and the outlet of the filter; the pressure of media at the front and the back parts of the filtering net respectively acts on both sides of the piston; pressure difference delta P which is produced by different plugging degree of the filtering net pushes the piston to move; a steel ball following a steel magnet on the piston is arranged out of a cylinder wall; the steel ball is arranged in a grooved rail labeled with marks indicating the displacement conditions of the piston; the plugging condition of the filtering net can be conveniently known via the position of the steel ball.

Description

The filter that has filtration state dynamic monitor

The utility model belongs to a kind of filter liquide medium and is the filter of filtering material with filter screen or filter core.

Filter is a kind of very wide chemical industry equipment of face that uses, and filter in use should in time be grasped the blockage of filter, so that in time filter is cleaned and changes filter screen or filter core.In the prior art, people generally understand the stopping state of filter by the pressure before the observation filter, but because the pressure before the filter also is subjected to the influence of the factors such as ruuning situation of pump apparatus, so the blockage of pressure before the filter and incomplete reflection filter.

The patent No. is that the utility model of CN93225653.8 has been released a kind of filter filtration state dynamic monitor.This device mainly is made of parts such as piston and cylinder bodies, and the two ends of cylinder body have an opening respectively, connects with the entrance and exit of filter separately, and the mark post of cylinder body is stretched out in piston connection one.The pressure of medium acts on the both sides of piston respectively before and after the filter, and the variation of pressure differential Δ P promotes piston action, the duty that reading that is exposed by mark post or mark can be understood filter intuitively.

This utility model has solved filter preferably and has filtered the problem of state dynamic monitoring, but remains in some shortcomings on its structure.At first be that the mark post that is used to indicate stretches out cylinder body, and slide with piston.This makes and has produced a dynamic sealing point on the cylinder body, and movable sealing very easily produces dielectric leakage for the liquid medium that certain pressure is arranged.In addition, because mark post is connected in the compression face of piston and stretches out outside the cylinder body, so the pressure differential Δ P of piston both sides is in fact owing to there is an eigenvalue in not waiting of compression area.Even the pressure that filter is imported and exported equates also have only piston ability balance when the elastic force of back-moving spring equates with this pressure differential, must seek a correction value when consequently using and just can obtain correct indication.

The purpose of this utility model provides a kind of filter, and it has a kind of filtration state dynamic monitor, and this monitoring device has structurally been done corresponding improvement at the shortcoming that existing filtration state dynamic monitor exists.

The filter that the utility model provides is made of filter housings, filter screen or filter core etc., connects one on the filter housings and filters the state dynamic monitor.This device mainly is made of piston, cylinder body and back-moving spring etc., and respectively there is an opening at the two ends of cylinder body, communicate with the import and the outlet of filter respectively.One side of piston is connected with a piston rod, and its corresponding cylinder body end face has the piston rod groove, and piston rod can stretch in the groove, and the degree of depth of groove is equal to or slightly greater than piston stroke.The casing wall of piston rod slot part outwards protrudes.A magnet steel is fixed on the piston rod top, casing wall have outward one with the steel ball of magnet steel servo-actuated, steel ball is placed in one and indicates in the grooved rail of the mark that shows the piston displacement situation.Back-moving spring communicates with filter in cylinder body between the end face and piston of a side.

It is empty too seriously to cause the pump cutout to be inhaled for fear of plugged filter, and the piston diameter surface of filtering in the state dynamic monitor has some overflow launders.Overflow launder originates in the end face of piston area to the opening that communicates with filter inlet, its length is shorter than piston width slightly, when piston moves to another opening direction, when the overflow launder terminal surpasses the cylinder body opening, two openings communicate by overflow launder, thereby make filter pass through the monitoring device bypass.Two openings on the cylinder body all are equipped with the bypass filter screen.

Accompanying drawing is the cross-sectional view of the utility model embodiment.

Further describe structure of the present utility model and its operation principle below in conjunction with accompanying drawing.

By accompanying drawing as seen, the housing 1 of filter is "T"-shaped, and filter screen 2 is placed in the middle part.The cylinder body 3 of monitoring device connects with flange with the opening of housing side, the opening 5 and 6 that is positioned at piston 4 both sides in the cylinder body communicates with the import and the outlet of filter respectively, bypass filter screen 7 is housed between flange, and the outer ring of this filter screen is made by encapsulant, so bypass filter screen 7 double as flange gasket again.

Piston rod 8 is connected with a side of piston, and the top is then stretched in the piston rod groove 9 on the cylinder body, and upper cover of piston rod has back-moving spring 10.Piston rod top embedding one magnet steel 11, one steel balls 12 are placed in the grooved rail of visor 13, and steel ball is because of the magnetic force servo-actuated with it of magnet steel.Visor is marked with the scale that shows the piston displacement situation.

New filter screen is when just bringing into use, and the pressure of medium is basic identical before and after the filter screen, and its pressure differential Δ P is not enough to overcome the elastic force of back-moving spring 10, and piston is failure to actuate.Along with filter screen is blocked gradually, Δ P increases thereupon, moves to right and drives steel ball and move thereby promote piston, can know the blockage of filter screen easily from the residing position of steel ball.

The piston diameter surface has some overflow launders 14, when filter screen stop up serious, piston may because of enough big Δ P move to right to overflow launder above cylinder body opening 6.This moment, two openings communicated by overflow launder, thereby made filter medium pass through the monitoring device bypass, can avoid pump to inhale empty the damage because of cutout like this.

Compared with prior art, the utility model has the advantages that not have movable sealing on the structure, thereby Reduced the leakage point of system, and the actual compression area of piston both sides is equal, uses more square Just. In addition, the integrated design of filter and monitoring device is also so that overall structure is more succinct.

Claims

1, a kind of filter that has filtration state dynamic monitor, by filter housings (1), filter screen or filter core formations such as (2), it is characterized in that connecting on the filter one and filter the state dynamic monitor, this device is mainly by piston (4), cylinder body (3) and back-moving spring formations such as (10), respectively there are an opening (5) and (6) in the two ends of cylinder body, communicate with the import and the outlet of filter respectively, one side of piston is connected with a piston rod (8), its corresponding cylinder body end face has piston rod groove (9), piston rod can stretch in the groove, the degree of depth of groove is equal to or slightly greater than piston stroke, the casing wall of piston rod slot part outwards protrudes, a magnet steel (11) is fixed on the piston rod top, casing wall have outward one with the steel ball (12) of magnet steel servo-actuated, steel ball is placed in one and indicates in the grooved rail of the mark that shows the piston displacement situation, and back-moving spring (10) communicates with filter in cylinder body between the end face and piston of a side.

2, according to the described filter of claim 1, it is characterized in that the piston diameter surface in the described filtration state dynamic monitor has some overflow launders (14), overflow launder originates in the end face of piston area to opening (5), its length is shorter than piston width slightly, when piston moves to opening (6) direction, when the overflow launder terminal surpassed cylinder body opening (6), opening (5) communicated with opening (6) by overflow launder.

3,, it is characterized in that cylinder body opening (5) and the opening (6) in the described filtration state dynamic monitor all is equipped with filter screen according to claim 1 or 2 described filters.