CN201547279U

CN201547279U - Labyrinth throttle decompression core package for adjusting valve

Info

Publication number: CN201547279U
Application number: CN2009202142726U
Authority: CN
Inventors: 孙强; 蔡良
Original assignee: SHANGHAI POWER EQUIPMENT MANUFACTURE CO Ltd
Current assignee: PowerChina SPEM Co Ltd
Priority date: 2009-11-27
Filing date: 2009-11-27
Publication date: 2010-08-11
Anticipated expiration: 2019-11-27

Abstract

The utility model discloses a labyrinth throttle decompression core package for an adjusting valve, which comprises a lower compression sheet, a middle layer component and an upper compression sheet, wherein the middle layer component is formed by a plurality of labyrinth discs through overlapping, and each labyrinth disc is a disc with a plurality of labyrinth structures inside and used for throttling fluid. The utility model integrates a plurality of advantages, such as stable decompression, avoidance of cavitation, reduction of pipeline vibration, and can efficiently finish works including throttling fluid, resisting cavitation, reducing vibration and the like of the adjusting valve; and the finer adjusting performance and the excellent sensitivity can save more energy for a machine set of a power plant, and efficiently improve the operation safety and the service life of the machine set at the same time.

Description

A kind of modulating valve mazy type expenditure and pressure core bag

Technical field

The utility model relates to a kind of device that is used for modulating valve, is specially the expenditure and pressure core bag of a kind of modulating valve with maze-type structure.

Background technique

Modulating valve is widely used in fields such as thermoelectricity, nuclear power, petrochemical industry, metallurgy.For example in thermal power generation system, modulating valve plays energy-saving and cost-reducing, safeguards unit safety operation, and its significance is self-evident.Though in today of scientific and technological develop rapidly, the technical development of modulating valve has also had certain innovation, in system, use the structure of modulating valve also to have certain defective, cause its adjusting function can't reach accurately and high sensitivity.

For modulating valve, present stage is widely used two big classes nothing more than: the valve (as shown in Figure 1) of a class for adopting spool to regulate usually.The geometrical shape of its spool head has determined that the adjusting of valve is linear.It is very long that but the valve head of this type valve can not be done, so its adjustment stroke is shorter, and adjusting function is also relatively poor, is difficult to satisfy the operating mode demand.Another kind of for to regulate by the core bag of valve, for example abroad relatively be extensive use of now and shroud formula (squirrel-cage) adjusting core bag.It is a kind of before though this type valve is compared, its adjustment stroke and adjusting function are improved, but it can't satisfy the requirement of regulating accuracy and sensitivity, and, how to avoid the generation of cavitation and the outstanding problems such as vibrations of minimizing pipeline still not to find good solution for how making the stable of step-down.

The model utility content

Problem to be solved in the utility model is to provide a kind of novel labyrinth expenditure and pressure core bag, the adjustment stroke that solves existing valve is short, problem such as regulate inadequately accurately and sensitivity is not high, and, how to avoid the generation of cavitation and the difficult problems such as vibrations of minimizing pipeline to find effective solution to how making the stable of step-down.

To achieve these goals, the utility model is to realize by the following technical solutions:

A kind of modulating valve mazy type expenditure and pressure core bag, described mazy type expenditure and pressure core bag reaches upward by lower sheeting, middle level member, and compressing tablet constitutes, described middle level member is formed by stacking by some labyrinth discs, and described labyrinth disc is to be provided with a plurality of labyrinth structures to be used for the disc that convection cell carries out the runner of throttling.

The utility model is owing to adopted the comparatively classification voltage drop method of science, classification step-down by a series of corners in every trickle runner, make the utlity model has step-down steadily, effect such as anti-cavitation, vibration damping be moving, and can satisfy the control requirement of modulating valve again, be convenient to user's use for more pinpoint accuracy and sensitivity.

Description of drawings

Describe the utility model in detail below in conjunction with the drawings and specific embodiments;

Fig. 1 is the present comparatively structural representation of modulating valve commonly used.

Fig. 2 is a structural representation of the present utility model.

Fig. 3 is the structure principle chart of mazy type disc in figure the utility model.

Fig. 4 is a control characteristic schematic representation of the present utility model.

The partial enlarged drawing of the single runner in Fig. 5 the utility model A place

Embodiment

For technological means, creation characteristic that the utility model is realized, reach purpose and effect is easy to understand, below in conjunction with embodiment, further set forth the utility model.

As shown in Figure 2, modulating valve is made up of last compressing tablet 1, middle level member 2 and press table 3 with mazy type expenditure and pressure core bag, and wherein middle level member 2 can be formed by stacking by some labyrinth discs 4.

As shown in Figure 3, in every labyrinth disc 4, be provided with the runner 401 that is used to make the fluid throttling of 16 strip adoption labyrinth structures designs, and all runners 401 all adopt the mode of circle gust, neat is arranging round the axle center.Because the labyrinth path 401 in the labyrinth disc 4 need be considered the Operational Limits that modulating valve is specific when design, working condition, concrete usage requirement such as control characteristic.For this reason, in the design of every labyrinth disc 4, can realize by the quantity that changes the corner 402 in the labyrinth path 401.And labyrinth disc 4 progressively consumes the entrained energy of fluid of flowing through by the corner 402 in the every labyrinth disc 4, the fluid that makes outflow from labyrinth disc 4, and its speed can be controlled in the scope of design.Under this decompression mode, the hydrodynamic pressure in labyrinth disc 4 outlet ports, also can under state comparatively stably, descend gradually (being that P is all the time under PV), thereby can prevent the generation of cavitation phenomenon effectively, eliminate the wash away unnecessary loss that caused of the fluid of those very fast flow velocitys valve seat.

The needs of different adjustment characteristic during according to use, middle level of the present utility model member 2 can select for use some different labyrinth discs to form according to the difference of Environmental Conditions when constituting.The linearity of so just easy to do realization modulating valve, open, revise control characteristics (with reference to Fig. 4) such as equal percentage soon.Again since the effective travel of whole mazy type core bag determined by the quantity of the labyrinth disc disc 4 that constitutes middle level member 2 and thickness, and the thickness of general labyrinth disc 4 is at 2.5mm～3.5mm, so labyrinth disc 4 selection has quantitatively just determined the net lift that valve is concrete.And; runner 401 in the labyrinth disc 4 plays diameter when designing and can be controlled at about 1.5mm; make the useful area of runner 401 be designed to comparatively narrow flow rate mode; can realize that like this spool is for those adjusting of flow in validity and sensitivity by the fluid of core bag; improved significantly; add the labyrinth path 401 in the labyrinth sheet 4; the fluid inlet pattern that it is less; can play the effect of comparatively outstanding filter screen; so the impurity that may flow into labyrinth path 401 is effectively isolated, thereby carries out certain protection for the security of operation of the unit in using.

When the utility model uses, fluid is when flowing through modulating valve, at first the double feed inlet from labyrinth disc 4 flows into the sheet of labyrinth (with reference to Fig. 5), the corner 402 of the distinctive labyrinth structure formula in the labyrinth disc 4 forces the flow direction of fluid to change then, the pressure of fluid and flow velocity also descend thereupon, behind the whole corner 402 of fluid by design, its pressure drop also reached service condition when fluid flowed out labyrinth disc 4, and the flow velocity of its high-pressure medium is also controlled below 30m/s at last.Because in whole section fluid step-down process, fluid is the classification step-down of carrying out the one-level level by a plurality of corners 402 in the runner 401, so each step-down is all very stable, the flow velocity of adding mazy type core bag convection cell has carried out strict restriction, so guaranteed that the step-down that modulating valve had is steady, anti-cavitation, effects such as vibration damping is moving, and middle level mechanism 2 has adopted the stack combinations design of multilayer labyrinth disc and the effective Flow area and the fluid inlet of small flow pattern, not only can effectively increase the effective travel of modulating valve, can also be trickleer modulating valve be regulated and control and controlled makes the effective performance of modulating valve be further enhanced.

More than show and described basic principle of the present utility model and major character and advantage of the present utility model.The technician of the industry should understand; the utility model is not restricted to the described embodiments; that describes in the foregoing description and the specification just illustrates principle of the present utility model; under the prerequisite that does not break away from the utility model spirit and scope; the utility model also has various changes and modifications, and these changes and improvements all fall in claimed the utility model scope.The claimed scope of the utility model is defined by appending claims and equivalent thereof.

Claims

1. a modulating valve is with mazy type expenditure and pressure core bag, it is characterized in that, described mazy type expenditure and pressure core bag reaches upward by lower sheeting, middle level member, and compressing tablet constitutes, described middle level member is formed by stacking by some labyrinth discs, and described labyrinth disc is that a kind of a plurality of labyrinth structures that are provided with are used for the disc that convection cell carries out the runner of throttling.