CN85203857U - Corrosion-proof solenoid valve - Google Patents

Abstract

The utility model discloses a bidirectional corrosion-proof sealing solenoid valve for controlling the corrosive fluid, comprising a coil, an iron core, a spring, a valve core, a valve seat, a bellow, etc. The bellow can prevent the corrosive fluid from contacting the members, such as the iron core, the spring, the chassis of the coil. The utility model has the advantages of simple structure, easy fabrication, low cost and corrosion resistance, having the hermetic sealing property. So the corrosion-proof sealing solenoid valve can also be used for the vacuum system, such as the stainless steel, the copper alloy.

Description

Corrosion-proof solenoid valve

The utility model relates to a kind of improvement of solenoid valve, is a kind of corrosion resistant two way sealed solenoid valve specifically, is used to control corrosive fluid.

At present, the anti-corrosion electric magnet valve that is used to control corrosive fluid has multiple.As (1) anti-corrosion electric magnet valve by the action of gravity sealing, members such as its valve body, spool are all made with resistant material, the valve body center line is vertical, during coil blackout, spool is pressed on the valve seat by action of gravity, is that the side at spool place is when introducing as the corrosive fluid of pressure from the upside of valve body, because valve is in closed condition, fluid can not pass through valve, and at this moment, solenoid valve can turn-off MEDIA FLOW reliably.And as the fluid of the pressure opposite side from valve body, i.e. during the beneath introducing of spool, because this kind valve does not possess the performance of forced seal, pressure medium can be washed spool open and seepage.(2) be sprayed on a kind of solenoid valve (DT3106400) on valve pocket and the piston with polymer (plastics), have leverage.Though this valve can be kept apart corrosive fluid and iron core, coil, structure is very complicated, and cost is higher.(3) direct action solenoid valve (DT2349155) of band spring, this valve is made up of coil, iron core, spring, spool and valve body.Spool on valve body, can be controlled flowing of both direction by spring compression reliably, promptly has two way sealed.Iron core is made with the good non-resistant material of magnetic property, and its outer surface wraps up (using welding method) with thin resistant material foreskin, makes iron core avoid corrosion.This electromagnetic valve structure is also complicated.In addition, because the existence of iron core foreskin has increased the distance of secured core and movable core, thereby increased magnetic resistance, reduced the electromagnetic attraction of iron core.Above-mentioned anti-corrosion electric magnet valve, what have is simple in structure, but the performance imperfection; Though the performance that has is good, complex structure, processing difficulties, expense is higher.

The purpose of this utility model is to provide a kind of good seal performance, operation is reliable, simple and reasonable, easy to manufacture, expense is lower anti-corrosion electric magnet valve, the bellows that two way sealed solenoid valve described in the utility model has a usefulness resistant material to make couples together spool assembly parts and valve body, to stop Korrosionsmedium to contact with members such as iron core, coil chassis, thereby the good non-resistant material of available magnetic conductivity is made iron core, makes spring with the normal carbon Spring Steel Wire.This structure has better seal, and therefore, this valve also can be used for vacuum system.(promptly be in the effect of pressure medium in order to make valve have good sealing property when arbitrary end at valve two ends, and the other end is when being in normal pressure or negative pressure, and medium can not leak from valve, promptly reached two way sealed), just require spool must be furnished with spring, so that enough sealing forces to be provided.In the certain limit of electromagnetic coil parameter, limited the further raising of spring pressure again.Therefore, sealing surface structure adopts the wide plane of the narrow planar annular of teflon flap to metal seat valve.The advantage of this structure is that area of contact is little, and seal pressure is big, good sealing effect, and when medium temperature fluctuation, teflon flap with metal valve body different distortion took place, sealability was unaffected.

Narrate embodiment of the present utility model below in conjunction with accompanying drawing.

Fig. 1 is the sectional drawing of the utility model solenoid valve.

Fig. 2 is the sectional drawing of the spool assembly parts of this valve.

Solenoid valve described in the utility model is made up of valve body (1), nut (2), sealing gasket (4) and (8), spool assembly parts (abbreviation spool) (5), locking nut (6), coil chassis (7), screw (9) and (15), coil (10), adjustment packing ring (11), spring (12), plectane (13), coil case (14), lock washer (16).The spool assembly parts is made up of guide sleeve (17), flap (18), packing ring (19), locking nut (20), valve rod (21), bellows (22), retaining ring (23), nut (24), iron core (25).Bellows one end and valve rod (21) welding, the other end and retaining ring (23) welding, welding method adopts roll welding or argon arc welding.When retaining ring (23) is pressed on the valve body (1) by sealing gasket (8), promptly formed the valve cavity of a sealing.Flap (18) and packing ring (19) are fixed on the valve rod end by threaded guide sleeve (17), and lock with locking nut (20).Packing ring (19) shields to flap (18).Iron core (25) borrows the screw thread on the valve rod to be connected with valve rod (21), adjusts it and is screwed into the stroke that the degree of depth can change spool (5), and can borrow nut (24) iron core (25) and valve rod (21) locking.Spring (12) provides sealing required power, and this power can be adjusted by the thickness of increase and decrease packing ring (11).Flap (18) can be changed, and the total length of spool (5) can be adjusted to change valve rod (21) stroke.The difference of the visual fluid of material of bellows (22) and difference can be made with stainless steel material the severe corrosive fluid as 1Cr18Ni9Ti, is made weak erosive fluid available copper alloy.

This solenoid valve working pressure is 2.13 * 10 ⁴Handkerchief to 3.43 * 10 ⁵Handkerchief; Operating temperature is a normal temperature; Working medium is the corrosive liquids or the gas (as salpeter solution and steam thereof etc.) of no suspended solid; Power supply is 24 volts of direct currents, and power is 20 watts.Under above-mentioned operating conditions, the utility model is selected the valve of the following parameter effect of being worked preferably for use.To being used for inside nominal diameter is 10 millimeters, and the flap annular sealing surface width of valve is 0.5 millimeter, and annular diameter is 13 millimeters, and spool stroke is 2 millimeters; The corrugated stainless steel tubing total length of valve is 20～30 millimeters, and wave number is 10～15, and global stiffness is 0.5～2.0 kilogram/millimeter; The electromagnetic core diameter of valve is 23 millimeters, and core section is long-pending to be 4.15 square centimeters, and coil turn is 2076; The spring specification is 1.4 * 10 * 35(millimeter).

The working principle of solenoid valve described in the utility model is as follows: when coil (10) cut off the power supply, iron core (25) was released, because the pressuring action of spring (12), spool (5) is pressed towards down, and flap (18) tightly is pressed on the valve body (1), and valve is promptly closed.At this moment, no matter feed when the corrosivity fluidity of pressure is arranged from an end interface of valve or the other end interface, fluid all can not be from the sealed door of an end infiltrate valve and the other end that bleeds.When coil (10) was switched on, because the electromagnetic attraction effect of iron core (25), spool (5) was raised, valve open, and fluid can pass through.Because the existence of bellows (22), corrosive fluid can not enter the upper cavity of solenoid valve, iron core (25), spring (12) and coil chassis non-corrosion resistant members such as (7) can not be subjected to the erosion of corrosive fluid, bellows (22) is an elastic element, it plays the sealing corrosion proof effect, but does not hinder the lifting of spool.

Experimental result shows, this magnetic valve favorable sealing property. From the air that arbitrary interface cut-in pressure of magnetic valve is setting, collect the bubble that spills from another interface of magnetic valve, last 30 minutes, have no a bubble and spill. Through the test of 5000 controlled valves, its sealing property and property indices are all unchanged. The expection magnetic valve life-span is not less than 5000 circulations.

Claims (2)

1, a kind of corrosion-resistant two way sealed solenoid valve of forming by coil [10], iron core [25], spool assembly parts [5], valve body [1], it is characterized in that the bellows [22] that has a usefulness resistant material to make, one end of bellows [22] links to each other with retaining ring [23], the other end of bellows [22] links to each other with spool assembly parts [5], can stop corrosive fluid to contact with iron core [25], spring [12], coil chassis members such as [7].

2,, it is characterized in that bellows (22) makes with stainless steel or Cuprum alloy by the described solenoid valve of claim 1.

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