CN201902683U - Labyrinth regulating valve - Google Patents

Abstract

The utility model relates to a labyrinth regulating valve, which comprises a valve body, a valve base, a valve cover, a valve rod and an actuator, wherein a medium inlet and a medium outlet are arranged on the valve body, a core covering component is arranged on the valve base, a plurality of labyrinth pieces with flow channels are overlaid in the core covering component, flow channels consist of a plurality of levels of right-angle turnings, and a communicated liquid channel is formed among the medium inlet, the core covering component and the medium outlet. The utility model has the advantages that the valve has a reasonable structure, effectively solves the problem that traditional regulating valves can generate cavitation, noise, shake and the like easily in working conditions of high temperature, high pressure and high pressure difference, meets the increasing demands of users in high parameters, high pressure difference, low noise requirements, wide flow regulating range and the like, and mainly applies to fields of power plants, petrifaction, paper making and the like with high pressure difference, low noise and the like.

Description

The mazy type modulating valve

Technical field

The utility model relates to a kind of modulating valve, especially a kind of mazy type modulating valve.

Background technique

Modulating valve is mainly used in various process pipes, to regulate various pipeline fluid flows, also is used for the water pipeline of boiler direct-contact desuperheater, is used for regulating injection flow rate, to reach the purpose of regulating boiler overheating steam temperature.The tradition modulating valve is because its structural reason only can be used for the occasion that low differential pressure, noise requirements are not high and flow adjustment range is little.Along with development of modern industry, various pipeline fluid parameter height, pressure reduction is big, noise requirements is high, and equipment develops to directions such as maximization, high parameter and high automations, and traditional modulating valve can not adapt to the needs of High Pressure Difference, low noise, big changes in flow rate.

Summary of the invention

The utility model will solve the shortcoming of above-mentioned prior art, and a kind of mazy type modulating valve that is widely used in operating modes such as high temperature, high pressure, High Pressure Difference, low noise, big changes in flow rate adjusting is provided.

The utility model solves the technological scheme that its technical problem adopts: this mazy type modulating valve, comprise valve body, valve seat, valve gap, valve rod, actuator, valve body is provided with medium import and media outlet, valve seat is provided with the core pack assembly, be superimposed with some labyrinth sheets that have runner in the core pack assembly, runner is made up of some grades right-angled bend, forms the fluid passage that is communicated with between medium import, core pack assembly and the media outlet.

As preferably, be superimposed with 10～30 labyrinth sheets, reasonably limited flow rate in the described core pack assembly.

As preferably, sheet inboard, described labyrinth is provided with the cofferdam groove that connects runner, homogeneous media is acted on the flap, effectively reduce the noise that MEDIA FLOW produces when core bag and flap, make the valve rod ambient pressure even, in the maintaining valve pole pair, avoid medium simultaneously, improved valve working life directly the washing away of valve rod, valve seat.

As preferably, be provided with flap between described core pack assembly and the valve rod, flap is provided with equalizing orifice, and the balance flap is pressure up and down, effectively reduces the flap lifting force, has reduced the thrust of actuator.

As preferably, form line between the flap of described valve seat and closed condition and contact good sealing effect.

As preferably, described flap is provided with the balanced seal circle, is used for isolating valve gap space and flap core bag space, stops the valve internal leakage.

As preferably, be provided with stuffing box packing between described valve gap and the valve rod.

As preferably, be provided with heavy surplus groove below the described core pack assembly, but sedimentation impurity and welding slag.

The effect that model utility is useful is: the utility model is rational in infrastructure, effectively solve traditional modulating valve and easily produce problems such as cavitation, noise and vibrations in high temperature, high pressure, High Pressure Difference operating mode, aspect needs such as satisfy the more and more higher high parameter of user, big pressure reduction, noise requirements is low and flow adjustment range is big are mainly used in fields such as High Pressure Difference such as power plant, petrochemical industry, papermaking, low noise.

Description of drawings

Fig. 1 is a structural representation of the present utility model;

Fig. 2 is the structural representation of core pack assembly;

Fig. 3 is the structural representation of labyrinth sheet;

Description of reference numerals: valve body 1, valve seat 2, core pack assembly 3, flap 4, valve gap 5, stuffing box packing 6, actuator 7, balanced seal circle 8, medium import 9, media outlet 10, heavy surplus groove 11, labyrinth sheet 12, runner 13, cofferdam groove 14, valve rod 15.

Embodiment

The utility model is described in further detail below in conjunction with accompanying drawing:

Embodiment: as Fig. 1, this mazy type modulating valve, comprise valve body 1, valve seat 2, valve gap 5, valve rod 15, actuator 7, valve body 1 is provided with medium import 9 and media outlet 10, valve seat 2 is provided with core pack assembly 3, forms the fluid passage that is communicated with between medium import 9, core pack assembly 3 and the media outlet 10.As Fig. 2,3, the core bag of valve rod is made up of 10～30 layers of labyrinth sheet 12, each labyrinth sheet 12 processes the runner 13 of some right-angle bendings, it is designed to the circuitous channel in trail, similar labyrinth according to parameter request, make velocity of medium control within the specific limits, select different runner 13 for use according to the parameter difference, can do Flow characteristicss such as linear or equal percentage, these labyrinth sheets 12 are superimposed, and fluid is divided into the multiply thread to the stream of trim by these runners 13, thereby realization consumed energy, the purpose of split reduction is fallen pressure and is reached maximum, and noise drops to minimum.Sheet 12 inboards in labyrinth are provided with the cofferdam groove 14 that connects runner 13, make valve rod 15 ambient pressures even.

According to mazy type modulating valve working principle, can calculate the flow of fluid of the mazy type modulating valve of flowing through and the relation of pressure drop.

According to fluid mechanics:

Q＝ρ·Q _v (1)

Q _v＝μ·A·v ₂ (2)

In the formula:

Q: mass of medium flow, t/h;

ρ: medium proportion, kg/m3;

Qv: medium volume flowrate, m3/h;

μ: flow coefficient;

A: mazy type modulating valve passage orifice size, m2;

V2: the flow velocity of MEDIA FLOW when the labyrinth sheet exports, m/s;

MEDIA FLOW is when the sheet right angle channel of multistage labyrinth, and limited flow rate makes the inlet/outlet flow velocity identical, so according to fluid mechanics principle:

$v_2=\sqrt{\frac{2g\·\mathrm{\Δp}}{\mathrm{\ρ}\·n}}---\left(3\right)$

In the formula:

G: gravity accleration, N/kg;

Δ p: MEDIA FLOW is through the pressure drop of labyrinth sheet, MPa;

N: turning progression;

With formula (2), (3) substitution formula (1):

$Q=\mathrm{\μ}\·\mathrm{\ρ}\·A\·\sqrt{\frac{2g\·\mathrm{\Δp}}{\mathrm{\ρ}\·n}}---\left(4\right)$

Provide parameter according to the user, utilize formula (4) can design rational labyrinth sheet number and rational turning progression.

Be provided with flap 4 between core pack assembly 3 and the valve rod 15, flap 4 is provided with equalizing orifice, 2 of flap 4 and valve seats adopt different amount, when being closed, flap 4 forms the line contact, flap 4 is provided with balanced seal circle 8, be provided with stuffing box packing 6 between valve gap 5 and the valve rod 15, more than all be in order to improve sealability.Heavy surplus design is adopted in valve body 1 inner core pack assembly 3 belows, is provided with heavy surplus groove 11.

In addition to the implementation, the utility model can also have other mode of executions.All employings are equal to the technological scheme of replacement or equivalent transformation formation, all drop on the protection domain of the utility model requirement.

Claims (8)

1. mazy type modulating valve, comprise valve body (1), valve seat (2), valve gap (5), valve rod (15), actuator (7), valve body (1) is provided with medium import (9) and media outlet (10), it is characterized in that: valve seat (2) is provided with core pack assembly (3), be superimposed with some labyrinth sheets (12) that have runner (13) in the core pack assembly (3), runner (13) is made up of some grades right-angled bend, forms the fluid passage that is communicated with between medium import (9), core pack assembly (3) and the media outlet (10).

2. mazy type modulating valve according to claim 1 is characterized in that: be superimposed with 10～30 labyrinth sheets (12) in the described core pack assembly (3).

3. mazy type modulating valve according to claim 1 is characterized in that: described labyrinth sheet (12) inboard is provided with the cofferdam groove (14) that connects runner (13).

4. mazy type modulating valve according to claim 1 is characterized in that: be provided with flap (4) between described core pack assembly (3) and the valve rod (15), flap (4) is provided with equalizing orifice.

5. mazy type modulating valve according to claim 4 is characterized in that: form line between the flap (4) of described valve seat (2) and closed condition and contact.

6. mazy type modulating valve according to claim 4 is characterized in that: described flap (4) is provided with balanced seal circle (8).

7. mazy type modulating valve according to claim 1 is characterized in that: be provided with stuffing box packing (6) between described valve gap (5) and the valve rod (15).

8. mazy type modulating valve according to claim 1 is characterized in that: described core pack assembly (3) below is provided with heavy surplus groove (11).

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