CN1037383A

CN1037383A - Control valve unit

Info

Publication number: CN1037383A
Application number: CN89102953A
Authority: CN
Inventors: 奥津良之; 坂田进
Original assignee: Azbil Corp
Current assignee: Azbil Corp
Priority date: 1988-04-30
Filing date: 1989-04-29
Publication date: 1989-11-22
Anticipated expiration: 2004-04-29
Also published as: KR930006513B1; CN1031595C; IN170729B; JPH01279187A; KR890016318A

Abstract

A kind of control valve unit comprises a seat ring, and this seat ring has a plurality of at its valve nozzle of axially arranging with predetermined interval, and mangetic core assembly is configured to have along the valve seat axis toward redoubling a plurality of spools that are used to open and close the liquid flow hole of valve nozzle.Between the upstream extremity valve nozzle of the valve nozzle of the upstream extremity spool of the spool of mangetic core assembly and seat ring, form a valve seat part.Contiguous valve seat part forms an annular mating part, takes shape between the valve nozzle in valve and downstream side at little these the annular mating parts that are used for constriction together with this annular mating part of opening under the valve state.

Description

Control valve unit

The present invention relates to a kind of control valve unit, it comprises that one axially has the seat ring of a plurality of valve nozzles at it.

Usually, in control valve unit such as modulating valve, when a kind of liquid as controlled fluid controlled when having big pressure difference, owing to air pocket will occur in the import of valve and the variation in pressure in outlet port.Spool be subjected to local etching with valve seat contact segment and valve base surface, thereby make the function of valve often impaired.In this case, people have taked the multiple counter measure.

Disclosed a kind of valve for general use device is exactly the valve that adopts this type in the Japan Patent that waits to examine 61-31772 number.More particularly, the control valve unit of this type has several from the multilevel hierarchy that the constriction of fluid upstream side side arrangement downstream constitutes, and by this scheme, pressure is reduced gradually.

In this general control valve unit, valve port partly carries out flow control by the flow control of each spool after opening at once.Therefore, this control valve unit is effective medium or big opening in the valve degree as reduction valve.Yet, tend to occur air pocket between valve seat contact segment and the valve seat surface little opening in the valve degree.This is owing in little opening in the valve degree, define minimum clearance between valve seat surface spool and valve seat contact segment and corresponding valve nozzle.When foreign matter was sandwiched between valve seat contact segment and the valve seat surface along with closing of valve, this phenomenon was particularly evident.As a result, spool be subjected to local etching with valve seat contact segment and valve base surface, or produce noise, so that can not make valve keep stable over a long time service behaviour.

The present invention has considered said circumstances, the purpose of this invention is to provide and a kind ofly can prevent being corroded of valve with valve seat contact segment and valve seat surface, can also in opening the valve degree for a short time, eliminate generating noise, thereby make valve keep stable service behaviour over a long time.

For realizing above-mentioned purpose of the present invention, the control valve unit that is provided comprises a kind of seat ring, this seat ring has a plurality of at its valve nozzle of axially arranging with predetermined interval, mangetic core assembly is configured to and can and has a plurality of spools that are used to open and close the liquid flow hole of valve nozzle along the to-and-fro motion of seat ring axis, wherein between the upstream extremity valve nozzle of the valve nozzle of the upstream extremity spool of the spool of mangetic core assembly and valve seat, form valve seat part, contiguous valve seat part forms an annular mating part, and to open under the valve state these annular portions that are used for constriction together with annular mating part be to form between the valve nozzle in valve and downstream side little.

According to the present invention, opening under the little situation of valve degree, can distribute and shrink the fluid of being controlled by annular mating part (constriction).

Below accompanying drawing is done simple declaration:

Fig. 1 and Fig. 2 represent respectively according to control valve unit of the present invention at sectional view little, different opening state;

Fig. 3 is the sectional view of expression whole control valve unit of the present invention.

Below by consulting the accompanying drawing illustrative embodiments, describe the solution of the present invention in detail.

Referring to Fig. 1 to Fig. 3, reference number 1 has indicated a cylindrical shape valve shell.Article one, the liquid opening 2 that links with downstream line forms in the shell wall of valve shell 1.Body that links with a upstream line (not shown) of reference number 3 expressions.Body 3 is fixed on the valve shell 1, and adpting flange 4 forms in two ends of body 3.Cylinder valve seat ring of reference number 5 expressions, it is as a valve seat that links with upstream and downstream pipeline (not shown).Seat ring 5 is bearing on the end face of flange 4a of body 3, and the each several part of this seat ring 5 is valve casing 1 inner the extension.Axially form three valve nozzles 6 to 8 along seat ring 5 with predetermined interval; Upstream extremity valve nozzle 6 has a valve seat surface 9, can place spool on it with valve seat contact segment (back explanation).Reference number 10 expressions have three spools 11 to 13 of the flow channel 6a to 8a that is used to out/closes valve nozzle 6 to 8, constitute a mangetic core assembly.Mangetic core assembly 10 can be along the axially reciprocating of seat ring 5.The spool 11 to 13 of mangetic core assembly 10 has flow control part 11a to 13a respectively.Upstream extremity spool 11 in the spool 11 to 13 has one in sit idly valve seat contact segment 14 on valve seat surface 9 of valve down periods.Annular mating part 15 forms between the flow channel 6a of the flow control part 11a of spool 11 and valve nozzle 6, and this part has the ring surface of basic identical diameter.

Annular mating part

15,16 and 17 is used as constriction respectively in little opening under the valve state.Between the valve nozzle 6 in upstream extremity spool 11 and downstream, limit valve seat part 18 by valve seat contact segment 14 and valve seat surface 9.Cylindrical guide cylinder of going up of reference number 19 expressions, it is fixed on the valve shell 1, is used to mangetic core assembly 10 guiding.Have on the annular wall of guide cylinder 19 by leading to outside liquid flow hole 19a in the guide.One of reference number 20 expression has guide wheel disk under the annular of liquid flow hole 20a, controlled fluid this hole of flowing through.Following positioning disk 20 places between seat ring 5 and the body 3, so that the same guide 19 pilot valve core assembly 10 together.Notice that it is because P that liquid stream flows by arrow direction among Fig. 3 ₁-P ₂=P(＞0) due to the pressure difference.

In having the control valve unit of such scheme, owing to, fluid is shunk with being assigned with by part (constriction) 15 to 17 with the predetermined interval axially-aligned in the little gap of liquid stream through limiting in the valve degree of opening by three annular mating parts 15 to 17.

Therefore,, can be reduced, thereby can prevent to produce air pocket between the valve seat surface 9 spool 11 and valve seat contact segment 14 and valve nozzle 6 in the little differential pressure of opening valve seat part 18 places in the valve degree according to the present invention.Just can prevent that also valve seat contact segment 14 and valve seat surface 9 are corroded, and can eliminate at valve seat part 18 places generation noise.

The centre or big opening under the valve state, because controlled fluid is shunk in general device in the same manner by valve nozzle 6 to 8 with being assigned with, therefore the differential pressure at valve seat part 18 places does not increase.In this case, if set equally mutually at the Pressure reducing ratio at valve nozzle 6 to 8 places, between downstream valve nozzle 8 and the downstream spool 13 air pocket will appear so.So,, and the pressure reduction of downstream constriction is reduced preferably by change flow coefficient (circulation area between flow control part and the seat ring).

Among this embodiment, each

downstream spool

12 and 13 has a circumferential surface with the level.Yet the present invention is not limited.Valve (not shown) not with the level also can use, as long as they have the

mating part

16 and 17 of annular.

In addition, if contracted length (axial dimension) l of mating part 15 to 17 of annular among the present invention ₁To l ₃(being shown in Fig. 1) is set to from the upstream side to the downstream side increases (l gradually ₁＜l ₂＜l ₃), then the differential pressure at valve seat 18 places just can reduce reliably.

In addition, among the present invention, the valve nozzle number is not limited to three valve nozzles 6 to 8 used among the embodiment.Such as, this numeral can be decided to be 2,4,5 ..., also can decide on demand.

As mentioned above, according to the present invention, valve seat part forms between the upstream extremity valve nozzle of valve nozzle of the upstream extremity spool that constitutes mangetic core assembly and seat ring.In addition, annular mating part is arranged to adjacent to valve seat part, forms between downstream spool and downstream valve nozzle respectively at the little annular mating part that is used for constriction under the valve state of opening.Therefore, make controlled fluid by shrinking distributively by annular mating part when opening the valve degree, so that reduce the differential pressure between the valve seat surface of the valve seat contact segment of spool and valve nozzle little.Since prevented from by this way to occur, just can prevent that valve seat contact segment and valve seat surface from being corroded, but also eliminate, thereby can make valve keep stable performance for a long time at valve seat part generation noise at the air pocket at the little valve degree of opening lower valve base place.According to another embodiment of the present invention, because the axial dimension (contracted length) of annular mating part is to increase gradually from the upstream side to the downstream side, therefore the differential pressure in valve seat part can reduce reliably.

Claims

1, a kind of control valve unit, it comprises:

Seat ring, this valve nozzle with a plurality of valve nozzles with predetermined interval along the seat ring axially-aligned; Mangetic core assembly is configured to along the to-and-fro motion of above-mentioned seat ring axis and has a plurality of spools that are used for opening and closing the liquid flow hole of above-mentioned valve nozzle;

Wherein, between the upstream extremity valve nozzle of the described valve nozzle of the upstream extremity spool of the spool of mangetic core assembly and above-mentioned seat ring, form a valve seat part, contiguous above-mentioned valve seat part forms an annular mating part, forms between the described valve nozzle in above-mentioned valve and downstream side as these annular mating parts of constriction together with above-mentioned annular mating part in little opening under the valve state.

2, according to the described control valve unit of claim 1, wherein the axial dimension of above-mentioned annular mating part is to increase gradually from the upstream side to the downstream side.