CN2115431U

CN2115431U - Choke length change type regulating valve

Info

Publication number: CN2115431U
Application number: CN 91232226
Authority: CN
Inventors: 王鸿君
Original assignee: FUYANG ELECTRIC INSTR FACTORY
Current assignee: FUYANG ELECTRIC INSTR FACTORY
Priority date: 1991-12-11
Filing date: 1991-12-11
Publication date: 1992-09-09

Abstract

The utility model discloses a valve used for adjusting the flowing quantity of the medium. A cylindrical valve core is always positioned into a valve seat hole and a gap used for the flowing of the medium is arranged on the cooperation surface of the valve core and the valve seat hole. The different depth of the valve core (the current choke length) in the valve seat hole can change the resistance coefficient of the valve in order to change the flowing quantity. The utility model solves the problems of inaccurate precision, large difference of flowing quantity characteristic, large difference of the rated flowing quantity coefficient of the valve, poor smooth degree and precision and difficult valve processing and other problems. The adjusting valve of choke length change type has good stability and convenient processing. The adjusting precision and the gap can be controlled in the 10<-2>mm stage. The utility model is in particular suitable to the adjustment of small flowing quantity and slight quantity.

Description

Choke length change type regulating valve

The utility model relates to a kind of valve that rate-of flow is regulated that is used for, and is particularly useful for small flow or trace adjusting.

Existing plunger valve spool is circular arc and shrinks shape, that is all different along the geomery in its each cross section, center, and it is that the resistance coefficient that variation by the circulation of the ring around spool area has changed valve is realized to the adjusting of flow.This spool is processed on copying lathe usually, the precision of shape, size is not too high, surface finishment is also not enough, and valve line grinds the back will be reduced with the corresponding circulation area of stroke, causes valve rated flow coefficient deviation and Flow characteristics derivation increasing, conformity relatively poor.Therefore can not be accurate to the adjusting of flow, especially can not adapt to the needs of small flow, trace adjusting.

The purpose of this utility model provides a kind of a small amount of or micro-modulating valve that can be used for rate-of flow, little, the high conformity of valve rated flow coefficient deviation and Flow characteristics derivation, and spool is easy to process, precision and degree of finish all can adhere to specification, and is more accurate to the adjusting of flow.

Variable throttling length type modulating valve has columniform spool, and spool is positioned at valve seat orifice at work all the time, can not deviate from from valve seat orifice, so spool and valve seat is all long than existing plunger valve.Have gap for the medium circulation on the valve seat orifice fitting surface at spool, this gap can have two kinds of forms to occur, and a kind of is to cooperate the gap in a ring cross section of formation than the cylindrical spool of minor diameter with bigger valve seat orifice; Another kind is with the isodiametric spool face of valve seat orifice the groove gap to be set.Groove can linearly distribute at spool face, and also line distributes in the shape of a spiral, and spiral is apart from equating or not waiting.The size of interval area depends on the capacity of valve, and its shape can be rectangle, trapezoidal, triangle or circular arc.The degree of depth appellation chock length of spool in valve seat orifice, it changes with stem movement.The variation of chock length promptly causes the change of the resistance coefficient of valve, and the rate-of flow by valve is changed.

To and contrast accompanying drawing by embodiment below is further described below variable throttling length type modulating valve.Accompanying drawing thes contents are as follows:

Fig. 1 is the positive view of variable throttling length type modulating valve;

Fig. 2 and Fig. 3 are second and third embodiment's positive views of the utility model modulating valve.

First embodiment can see from Fig. 1.It includes valve seat 1, valve head 2 and is positioned at packing washer 5 on their both junction planes.Have fluid inlet 13, outlet 11, center valve seat orifice 14 and valve seat orifice on the valve seat with the duct 12 that is connected between the inlet/outlet.A valve rod 4 that has dynamic seal apparatus 3 is housed in the center hole of valve head 2, and the valve rod end is a spool 41.Annulus cylindrical space between spool and the valve seat orifice is gap 15, and spool top band conical surface 42, and this face can match with the conical surface on the valve seat orifice 16, closes modulating valve to cut off fluid passage.Valve rod 4 can move up and down in the center hole of valve head 2

conical surface

16,42 is done separately or the motion that coincide, and can change chock length H to change the resistance coefficient adjusting flow of valve.When valve rod rests on when working on a certain position, chock length is a steady state value, and the flow by valve also is a definite value.

Second and third embodiment and first embodiment's difference are generation type and its shape in gap 15.Their valve seat orifice and spool are isometrical, and spool table is worn groove, and wherein second embodiment can see from Fig. 2, and this groove is linear, and the 3rd embodiment is spiral.On Fig. 3 a as can be seen groove be to be equidistant spirality to distribute, the groove of Fig. 3 b is to be unequal distant screw shape to distribute.Slot number can be according to the decision of valve capacity size, and it can be one and also can be increased to more than one.

The advantage of the utility model control valve is: 1) spool make into cylindric after, even it is not difficult to select the higher material of hardness number to process yet, and can obtain higher precision and fineness, and valve rated flow coefficient deviation and flow characteristics derivation is all little, high conformity, make valve more accurate to the adjusting of flow. 2) valve seat orifice can play the guide effect to spool, so Operating stability of valve is good. 3) gap can be controlled in 10 in grinding^－2In the mm level, make the utility model control valve can be used for low discharge, micro-adjustment process, below the former dN8 of example, even the spool below the dN3 can be equipped with little gap with the big spool of size now and reach rated valve capacity owing to size, machining accuracy are difficult to guarantee. 4) can be by the variation of gap shape be changed discharge characteristic, first and second embodiment discharge characteristic near linear type for example, and the spiral gap of the decreasing worm-pitch among the 3rd embodiment, discharge characteristic can be non-linearity. Therefore the utility model control valve can be widely used in the automatic control system, not only can satisfy various required precisions but also can satisfy the requirement of uninterrupted discharge characteristic.

Claims

1, a kind of include one the band fluid inlet 13, outlet 11, center valve seat orifice 14 and connection valve seat orifice are with advancing, the valve seat 1 in duct 12 of outlet and one have dynamic seal apparatus 3, the valve head 2 of valve rod 4, and be positioned at valve seat, the variable throttling length type modulating valve of the packing washer 5 on the valve head junction plane, it is characterized in that: the spool 41 that is positioned at the valve rod end is cylindrical, has gap 15 on the fitting surface of spool and valve seat orifice 14 for the medium circulation, spool all the time in valve seat orifice and can not deviate from from valve seat orifice, also has a conical surface 16 when closing modulating valve and on the valve seat orifice and matches to cut off the conical surface 42 of media flow when valve is worked on the spool.

2, modulating valve as claimed in claim 1 is characterized in that: said gap 15 is annulus cylindrical spaces that form between than the spool of minor diameter and larger-diameter valve seat orifice.

3, modulating valve as claimed in claim 1 is characterized in that: said gap 15 be one with the isodiametric spool face of valve seat orifice on the groove that had for medium circulation.

4, it is characterized in that as claim 1 and 3 described modulating valve: said groove is linearly shape distribution on spool 41 surfaces.

5, it is characterized in that as claim 1 and 3 described modulating valve: said groove is to be threaded line to distribute on spool 41 surfaces.